From 4f75a78165ab3632249a621263ea41eb2a40b690 Mon Sep 17 00:00:00 2001 From: Sebastian Huber Date: Tue, 7 Apr 2015 15:31:27 +0200 Subject: mghttpd: Import from RTEMS --- Makefile | 3 + freebsd-to-rtems.py | 9 + rtemsbsd/mghttpd/mongoose.c | 5521 +++++++++++++++++++++++++++++++++++++++++++ rtemsbsd/mghttpd/mongoose.h | 386 +++ 4 files changed, 5919 insertions(+) create mode 100644 rtemsbsd/mghttpd/mongoose.c create mode 100644 rtemsbsd/mghttpd/mongoose.h diff --git a/Makefile b/Makefile index 82315708..5f419a5e 100644 --- a/Makefile +++ b/Makefile @@ -1518,6 +1518,9 @@ LIB_C_FILES += dhcpcd/crypt/hmac_md5.c dhcpcd/crypt/hmac_md5.o: dhcpcd/crypt/hmac_md5.c $(CC) $(CPPFLAGS) $(CFLAGS) -D__FreeBSD__ -DTHERE_IS_NO_FORK -DMASTER_ONLY -DINET -DINET6 -c $< -o $@ LIB_C_FILES += rtemsbsd/rtems/rtems-bsd-shell-dhcpcd.c +LIB_C_FILES += rtemsbsd/mghttpd/mongoose.c +rtemsbsd/mghttpd/mongoose.o: rtemsbsd/mghttpd/mongoose.c + $(CC) $(CPPFLAGS) $(CFLAGS) -DNO_SSL -DNO_POPEN -DNO_CGI -DUSE_WEBSOCKET -c $< -o $@ LIB_C_FILES += mDNSResponder/mDNSCore/anonymous.c LIB_C_FILES += mDNSResponder/mDNSCore/CryptoAlg.c LIB_C_FILES += mDNSResponder/mDNSCore/DNSCommon.c diff --git a/freebsd-to-rtems.py b/freebsd-to-rtems.py index a75d58de..199cb9b1 100755 --- a/freebsd-to-rtems.py +++ b/freebsd-to-rtems.py @@ -2595,6 +2595,14 @@ mdnsresponder.addSourceFiles( ] ) +mghttpd = Module('mghttpd') +mghttpd.addSourceFiles( + [ + 'rtemsbsd/mghttpd/mongoose.c', + ], + '-DNO_SSL -DNO_POPEN -DNO_CGI -DUSE_WEBSOCKET' +) + # Register all the Module instances with the Module Manager mm.addModule(rtems) mm.addModule(base) @@ -2639,6 +2647,7 @@ mm.addModule(userSpace) mm.addModule(tests) mm.addModule(dhcpcd) +mm.addModule(mghttpd) mm.addModule(mdnsresponder) # XXX TODO Check that no file is also listed in empty diff --git a/rtemsbsd/mghttpd/mongoose.c b/rtemsbsd/mghttpd/mongoose.c new file mode 100644 index 00000000..dd243d33 --- /dev/null +++ b/rtemsbsd/mghttpd/mongoose.c @@ -0,0 +1,5521 @@ +// Copyright (c) 2004-2013 Sergey Lyubka +// +// Permission is hereby granted, free of charge, to any person obtaining a copy +// of this software and associated documentation files (the "Software"), to deal +// in the Software without restriction, including without limitation the rights +// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell +// copies of the Software, and to permit persons to whom the Software is +// furnished to do so, subject to the following conditions: +// +// The above copyright notice and this permission notice shall be included in +// all copies or substantial portions of the Software. +// +// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR +// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, +// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE +// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER +// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, +// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN +// THE SOFTWARE. + +#if HAVE_CONFIG_H +#include "config.h" +#endif + +#if defined(__rtems__) +#include +#define HAVE_MD5 +#endif // __rtems__ + +#if defined(_WIN32) +#if !defined(_CRT_SECURE_NO_WARNINGS) +#define _CRT_SECURE_NO_WARNINGS // Disable deprecation warning in VS2005 +#endif +#else +#ifdef __linux__ +#define _XOPEN_SOURCE 600 // For flockfile() on Linux +#endif +#define _LARGEFILE_SOURCE // Enable 64-bit file offsets +#define __STDC_FORMAT_MACROS // wants this for C++ +#define __STDC_LIMIT_MACROS // C++ wants that for INT64_MAX +#endif + +#if defined (_MSC_VER) +// conditional expression is constant: introduced by FD_SET(..) +#pragma warning (disable : 4127) +// non-constant aggregate initializer: issued due to missing C99 support +#pragma warning (disable : 4204) +#endif + +// Disable WIN32_LEAN_AND_MEAN. +// This makes windows.h always include winsock2.h +#ifdef WIN32_LEAN_AND_MEAN +#undef WIN32_LEAN_AND_MEAN +#endif + +#if defined(__SYMBIAN32__) +#define NO_SSL // SSL is not supported +#define NO_CGI // CGI is not supported +#define PATH_MAX FILENAME_MAX +#endif // __SYMBIAN32__ + +#ifndef _WIN32_WCE // Some ANSI #includes are not available on Windows CE +#include +#include +#include +#include +#include +#endif // !_WIN32_WCE + +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#if defined(_WIN32) && !defined(__SYMBIAN32__) // Windows specific +#undef _WIN32_WINNT +#define _WIN32_WINNT 0x0400 // To make it link in VS2005 +#include + +#ifndef PATH_MAX +#define PATH_MAX MAX_PATH +#endif + +#ifndef _WIN32_WCE +#include +#include +#include +#else // _WIN32_WCE +#define NO_CGI // WinCE has no pipes + +typedef long off_t; + +#define errno GetLastError() +#define strerror(x) _ultoa(x, (char *) _alloca(sizeof(x) *3 ), 10) +#endif // _WIN32_WCE + +#define MAKEUQUAD(lo, hi) ((uint64_t)(((uint32_t)(lo)) | \ + ((uint64_t)((uint32_t)(hi))) << 32)) +#define RATE_DIFF 10000000 // 100 nsecs +#define EPOCH_DIFF MAKEUQUAD(0xd53e8000, 0x019db1de) +#define SYS2UNIX_TIME(lo, hi) \ + (time_t) ((MAKEUQUAD((lo), (hi)) - EPOCH_DIFF) / RATE_DIFF) + +// Visual Studio 6 does not know __func__ or __FUNCTION__ +// The rest of MS compilers use __FUNCTION__, not C99 __func__ +// Also use _strtoui64 on modern M$ compilers +#if defined(_MSC_VER) && _MSC_VER < 1300 +#define STRX(x) #x +#define STR(x) STRX(x) +#define __func__ __FILE__ ":" STR(__LINE__) +#define strtoull(x, y, z) (unsigned __int64) _atoi64(x) +#define strtoll(x, y, z) _atoi64(x) +#else +#define __func__ __FUNCTION__ +#define strtoull(x, y, z) _strtoui64(x, y, z) +#define strtoll(x, y, z) _strtoi64(x, y, z) +#endif // _MSC_VER + +#define ERRNO GetLastError() +#define NO_SOCKLEN_T +#define SSL_LIB "ssleay32.dll" +#define CRYPTO_LIB "libeay32.dll" +#define O_NONBLOCK 0 +#if !defined(EWOULDBLOCK) +#define EWOULDBLOCK WSAEWOULDBLOCK +#endif // !EWOULDBLOCK +#define _POSIX_ +#define INT64_FMT "I64d" + +#define WINCDECL __cdecl +#define SHUT_WR 1 +#define snprintf _snprintf +#define vsnprintf _vsnprintf +#define mg_sleep(x) Sleep(x) + +#define pipe(x) _pipe(x, MG_BUF_LEN, _O_BINARY) +#ifndef popen +#define popen(x, y) _popen(x, y) +#endif +#ifndef pclose +#define pclose(x) _pclose(x) +#endif +#define close(x) _close(x) +#define dlsym(x,y) GetProcAddress((HINSTANCE) (x), (y)) +#define RTLD_LAZY 0 +#define fseeko(x, y, z) _lseeki64(_fileno(x), (y), (z)) +#define fdopen(x, y) _fdopen((x), (y)) +#define write(x, y, z) _write((x), (y), (unsigned) z) +#define read(x, y, z) _read((x), (y), (unsigned) z) +#define flockfile(x) EnterCriticalSection(&global_log_file_lock) +#define funlockfile(x) LeaveCriticalSection(&global_log_file_lock) +#define sleep(x) Sleep((x) * 1000) +#define rmdir(x) _rmdir(x) + +#if !defined(va_copy) +#define va_copy(x, y) x = y +#endif // !va_copy MINGW #defines va_copy + +#if !defined(fileno) +#define fileno(x) _fileno(x) +#endif // !fileno MINGW #defines fileno + +typedef HANDLE pthread_mutex_t; +typedef struct {HANDLE signal, broadcast;} pthread_cond_t; +typedef DWORD pthread_t; +#define pid_t HANDLE // MINGW typedefs pid_t to int. Using #define here. + +static int pthread_mutex_lock(pthread_mutex_t *); +static int pthread_mutex_unlock(pthread_mutex_t *); +static void to_unicode(const char *path, wchar_t *wbuf, size_t wbuf_len); +struct file; +static char *mg_fgets(char *buf, size_t size, struct file *filep, char **p); + +#if defined(HAVE_STDINT) +#include +#else +typedef unsigned int uint32_t; +typedef unsigned short uint16_t; +typedef unsigned __int64 uint64_t; +typedef __int64 int64_t; +#define INT64_MAX 9223372036854775807 +#endif // HAVE_STDINT + +// POSIX dirent interface +struct dirent { + char d_name[PATH_MAX]; +}; + +typedef struct DIR { + HANDLE handle; + WIN32_FIND_DATAW info; + struct dirent result; +} DIR; + + +// Mark required libraries +#ifdef _MSC_VER +#pragma comment(lib, "Ws2_32.lib") +#endif + +#else // UNIX specific +#include +#include +#include +#ifdef HAVE_POLL +#include +#endif +#include +#include +#include +#include +#include +#include + +#include +#include +#include +#if !defined(NO_SSL_DL) && !defined(NO_SSL) +#include +#endif +#include +#if defined(__MACH__) +#define SSL_LIB "libssl.dylib" +#define CRYPTO_LIB "libcrypto.dylib" +#else +#if !defined(SSL_LIB) +#define SSL_LIB "libssl.so" +#endif +#if !defined(CRYPTO_LIB) +#define CRYPTO_LIB "libcrypto.so" +#endif +#endif +#ifndef O_BINARY +#define O_BINARY 0 +#endif // O_BINARY +#define closesocket(a) close(a) +#define mg_mkdir(x, y) mkdir(x, y) +#define mg_remove(x) remove(x) +#define mg_sleep(x) usleep((x) * 1000) +#define ERRNO errno +#define INVALID_SOCKET (-1) +#define INT64_FMT PRId64 +typedef int SOCKET; +#define WINCDECL + +#endif // End of Windows and UNIX specific includes + +#ifndef HAVE_POLL +struct pollfd { + SOCKET fd; + short events; + short revents; +}; +#define POLLIN 1 +#endif + +#include "mongoose.h" + +#define MONGOOSE_VERSION "3.9" +#define PASSWORDS_FILE_NAME ".htpasswd" +#define CGI_ENVIRONMENT_SIZE 4096 +#define MAX_CGI_ENVIR_VARS 64 +#define MG_BUF_LEN 8192 +#define MAX_REQUEST_SIZE 16384 +#define ARRAY_SIZE(array) (sizeof(array) / sizeof(array[0])) + +#ifdef _WIN32 +static CRITICAL_SECTION global_log_file_lock; +static pthread_t pthread_self(void) { + return GetCurrentThreadId(); +} +#endif // _WIN32 + +#ifdef DEBUG_TRACE +#undef DEBUG_TRACE +#define DEBUG_TRACE(x) +#else +#if defined(DEBUG) +#define DEBUG_TRACE(x) do { \ + flockfile(stdout); \ + printf("*** %lu.%p.%s.%d: ", \ + (unsigned long) time(NULL), (void *) pthread_self(), \ + __func__, __LINE__); \ + printf x; \ + putchar('\n'); \ + fflush(stdout); \ + funlockfile(stdout); \ +} while (0) +#else +#define DEBUG_TRACE(x) +#endif // DEBUG +#endif // DEBUG_TRACE + +// Darwin prior to 7.0 and Win32 do not have socklen_t +#ifdef NO_SOCKLEN_T +typedef int socklen_t; +#endif // NO_SOCKLEN_T +#define _DARWIN_UNLIMITED_SELECT + +#define IP_ADDR_STR_LEN 50 // IPv6 hex string is 46 chars + +#if !defined(MSG_NOSIGNAL) +#define MSG_NOSIGNAL 0 +#endif + +#if !defined(SOMAXCONN) +#define SOMAXCONN 100 +#endif + +#if !defined(PATH_MAX) +#define PATH_MAX 4096 +#endif + +// Size of the accepted socket queue +#if !defined(MGSQLEN) +#define MGSQLEN 20 +#endif + +static const char *http_500_error = "Internal Server Error"; + +#if defined(NO_SSL_DL) +#include +#include +#else +// SSL loaded dynamically from DLL. +// I put the prototypes here to be independent from OpenSSL source installation. +typedef struct ssl_st SSL; +typedef struct ssl_method_st SSL_METHOD; +typedef struct ssl_ctx_st SSL_CTX; + +struct ssl_func { + const char *name; // SSL function name + void (*ptr)(void); // Function pointer +}; + +#define SSL_free (* (void (*)(SSL *)) ssl_sw[0].ptr) +#define SSL_accept (* (int (*)(SSL *)) ssl_sw[1].ptr) +#define SSL_connect (* (int (*)(SSL *)) ssl_sw[2].ptr) +#define SSL_read (* (int (*)(SSL *, void *, int)) ssl_sw[3].ptr) +#define SSL_write (* (int (*)(SSL *, const void *,int)) ssl_sw[4].ptr) +#define SSL_get_error (* (int (*)(SSL *, int)) ssl_sw[5].ptr) +#define SSL_set_fd (* (int (*)(SSL *, SOCKET)) ssl_sw[6].ptr) +#define SSL_new (* (SSL * (*)(SSL_CTX *)) ssl_sw[7].ptr) +#define SSL_CTX_new (* (SSL_CTX * (*)(SSL_METHOD *)) ssl_sw[8].ptr) +#define SSLv23_server_method (* (SSL_METHOD * (*)(void)) ssl_sw[9].ptr) +#define SSL_library_init (* (int (*)(void)) ssl_sw[10].ptr) +#define SSL_CTX_use_PrivateKey_file (* (int (*)(SSL_CTX *, \ + const char *, int)) ssl_sw[11].ptr) +#define SSL_CTX_use_certificate_file (* (int (*)(SSL_CTX *, \ + const char *, int)) ssl_sw[12].ptr) +#define SSL_CTX_set_default_passwd_cb \ + (* (void (*)(SSL_CTX *, mg_callback_t)) ssl_sw[13].ptr) +#define SSL_CTX_free (* (void (*)(SSL_CTX *)) ssl_sw[14].ptr) +#define SSL_load_error_strings (* (void (*)(void)) ssl_sw[15].ptr) +#define SSL_CTX_use_certificate_chain_file \ + (* (int (*)(SSL_CTX *, const char *)) ssl_sw[16].ptr) +#define SSLv23_client_method (* (SSL_METHOD * (*)(void)) ssl_sw[17].ptr) +#define SSL_pending (* (int (*)(SSL *)) ssl_sw[18].ptr) +#define SSL_CTX_set_verify (* (void (*)(SSL_CTX *, int, int)) ssl_sw[19].ptr) +#define SSL_shutdown (* (int (*)(SSL *)) ssl_sw[20].ptr) + +#define CRYPTO_num_locks (* (int (*)(void)) crypto_sw[0].ptr) +#define CRYPTO_set_locking_callback \ + (* (void (*)(void (*)(int, int, const char *, int))) crypto_sw[1].ptr) +#define CRYPTO_set_id_callback \ + (* (void (*)(unsigned long (*)(void))) crypto_sw[2].ptr) +#define ERR_get_error (* (unsigned long (*)(void)) crypto_sw[3].ptr) +#define ERR_error_string (* (char * (*)(unsigned long,char *)) crypto_sw[4].ptr) + +// set_ssl_option() function updates this array. +// It loads SSL library dynamically and changes NULLs to the actual addresses +// of respective functions. The macros above (like SSL_connect()) are really +// just calling these functions indirectly via the pointer. +static struct ssl_func ssl_sw[] = { + {"SSL_free", NULL}, + {"SSL_accept", NULL}, + {"SSL_connect", NULL}, + {"SSL_read", NULL}, + {"SSL_write", NULL}, + {"SSL_get_error", NULL}, + {"SSL_set_fd", NULL}, + {"SSL_new", NULL}, + {"SSL_CTX_new", NULL}, + {"SSLv23_server_method", NULL}, + {"SSL_library_init", NULL}, + {"SSL_CTX_use_PrivateKey_file", NULL}, + {"SSL_CTX_use_certificate_file",NULL}, + {"SSL_CTX_set_default_passwd_cb",NULL}, + {"SSL_CTX_free", NULL}, + {"SSL_load_error_strings", NULL}, + {"SSL_CTX_use_certificate_chain_file", NULL}, + {"SSLv23_client_method", NULL}, + {"SSL_pending", NULL}, + {"SSL_CTX_set_verify", NULL}, + {"SSL_shutdown", NULL}, + {NULL, NULL} +}; + +// Similar array as ssl_sw. These functions could be located in different lib. +#if !defined(NO_SSL) +static struct ssl_func crypto_sw[] = { + {"CRYPTO_num_locks", NULL}, + {"CRYPTO_set_locking_callback", NULL}, + {"CRYPTO_set_id_callback", NULL}, + {"ERR_get_error", NULL}, + {"ERR_error_string", NULL}, + {NULL, NULL} +}; +#endif // NO_SSL +#endif // NO_SSL_DL + +static const char *month_names[] = { + "Jan", "Feb", "Mar", "Apr", "May", "Jun", + "Jul", "Aug", "Sep", "Oct", "Nov", "Dec" +}; + +// Unified socket address. For IPv6 support, add IPv6 address structure +// in the union u. +union usa { + struct sockaddr sa; + struct sockaddr_in sin; +#if defined(USE_IPV6) + struct sockaddr_in6 sin6; +#endif +}; + +// Describes a string (chunk of memory). +struct vec { + const char *ptr; + size_t len; +}; + +struct file { + int is_directory; + time_t modification_time; + int64_t size; + FILE *fp; + const char *membuf; // Non-NULL if file data is in memory + // set to 1 if the content is gzipped + // in which case we need a content-encoding: gzip header + int gzipped; +}; +#define STRUCT_FILE_INITIALIZER {0, 0, 0, NULL, NULL, 0} + +// Describes listening socket, or socket which was accept()-ed by the master +// thread and queued for future handling by the worker thread. +struct socket { + SOCKET sock; // Listening socket + union usa lsa; // Local socket address + union usa rsa; // Remote socket address + unsigned is_ssl:1; // Is port SSL-ed + unsigned ssl_redir:1; // Is port supposed to redirect everything to SSL port +}; + +// NOTE(lsm): this enum shoulds be in sync with the config_options below. +enum { + CGI_EXTENSIONS, CGI_ENVIRONMENT, PUT_DELETE_PASSWORDS_FILE, CGI_INTERPRETER, + PROTECT_URI, AUTHENTICATION_DOMAIN, SSI_EXTENSIONS, THROTTLE, + ACCESS_LOG_FILE, ENABLE_DIRECTORY_LISTING, ERROR_LOG_FILE, + GLOBAL_PASSWORDS_FILE, INDEX_FILES, ENABLE_KEEP_ALIVE, ACCESS_CONTROL_LIST, + EXTRA_MIME_TYPES, LISTENING_PORTS, DOCUMENT_ROOT, SSL_CERTIFICATE, + NUM_THREADS, RUN_AS_USER, REWRITE, HIDE_FILES, REQUEST_TIMEOUT, + THREAD_STACK_SIZE, THREAD_PRIORITY, THREAD_POLICY, + NUM_OPTIONS +}; + +static const char *config_options[] = { + "cgi_pattern", "**.cgi$|**.pl$|**.php$", + "cgi_environment", NULL, + "put_delete_auth_file", NULL, + "cgi_interpreter", NULL, + "protect_uri", NULL, + "authentication_domain", "mydomain.com", + "ssi_pattern", "**.shtml$|**.shtm$", + "throttle", NULL, + "access_log_file", NULL, + "enable_directory_listing", "yes", + "error_log_file", NULL, + "global_auth_file", NULL, + "index_files", + "index.html,index.htm,index.cgi,index.shtml,index.php,index.lp", + "enable_keep_alive", "no", + "access_control_list", NULL, + "extra_mime_types", NULL, + "listening_ports", "8080", + "document_root", NULL, + "ssl_certificate", NULL, + "num_threads", "50", + "run_as_user", NULL, + "url_rewrite_patterns", NULL, + "hide_files_patterns", NULL, + "request_timeout_ms", "30000", + "thread_stack_size", NULL, + "thread_priority", NULL, + "thread_policy", NULL, + NULL +}; + +struct mg_context { + volatile int stop_flag; // Should we stop event loop + SSL_CTX *ssl_ctx; // SSL context + char *config[NUM_OPTIONS]; // Mongoose configuration parameters + struct mg_callbacks callbacks; // User-defined callback function + void *user_data; // User-defined data + + struct socket *listening_sockets; + int num_listening_sockets; + + volatile int num_threads; // Number of threads + pthread_mutex_t mutex; // Protects (max|num)_threads + pthread_cond_t cond; // Condvar for tracking workers terminations + + struct socket queue[MGSQLEN]; // Accepted sockets + volatile int sq_head; // Head of the socket queue + volatile int sq_tail; // Tail of the socket queue + pthread_cond_t sq_full; // Signaled when socket is produced + pthread_cond_t sq_empty; // Signaled when socket is consumed +}; + +struct mg_connection { + struct mg_request_info request_info; + struct mg_context *ctx; + SSL *ssl; // SSL descriptor + SSL_CTX *client_ssl_ctx; // SSL context for client connections + struct socket client; // Connected client + time_t birth_time; // Time when request was received + int64_t num_bytes_sent; // Total bytes sent to client + int64_t content_len; // Content-Length header value + int64_t consumed_content; // How many bytes of content have been read + char *buf; // Buffer for received data + char *path_info; // PATH_INFO part of the URL + int must_close; // 1 if connection must be closed + int buf_size; // Buffer size + int request_len; // Size of the request + headers in a buffer + int data_len; // Total size of data in a buffer + int status_code; // HTTP reply status code, e.g. 200 + int throttle; // Throttling, bytes/sec. <= 0 means no throttle + time_t last_throttle_time; // Last time throttled data was sent + int64_t last_throttle_bytes;// Bytes sent this second +}; + +// Directory entry +struct de { + struct mg_connection *conn; + char *file_name; + struct file file; +}; + +const char **mg_get_valid_option_names(void) { + return config_options; +} + +static int is_file_in_memory(struct mg_connection *conn, const char *path, + struct file *filep) { + size_t size = 0; + if ((filep->membuf = conn->ctx->callbacks.open_file == NULL ? NULL : + conn->ctx->callbacks.open_file(conn, path, &size)) != NULL) { + // NOTE: override filep->size only on success. Otherwise, it might break + // constructs like if (!mg_stat() || !mg_fopen()) ... + filep->size = size; + } + return filep->membuf != NULL; +} + +static int is_file_opened(const struct file *filep) { + return filep->membuf != NULL || filep->fp != NULL; +} + +static int mg_fopen(struct mg_connection *conn, const char *path, + const char *mode, struct file *filep) { + if (!is_file_in_memory(conn, path, filep)) { +#ifdef _WIN32 + wchar_t wbuf[PATH_MAX], wmode[20]; + to_unicode(path, wbuf, ARRAY_SIZE(wbuf)); + MultiByteToWideChar(CP_UTF8, 0, mode, -1, wmode, ARRAY_SIZE(wmode)); + filep->fp = _wfopen(wbuf, wmode); +#else + filep->fp = fopen(path, mode); +#endif + } + + return is_file_opened(filep); +} + +static void mg_fclose(struct file *filep) { + if (filep != NULL && filep->fp != NULL) { + fclose(filep->fp); + } +} + +static int get_option_index(const char *name) { + int i; + + for (i = 0; config_options[i * 2] != NULL; i++) { + if (strcmp(config_options[i * 2], name) == 0) { + return i; + } + } + return -1; +} + +const char *mg_get_option(const struct mg_context *ctx, const char *name) { + int i; + if ((i = get_option_index(name)) == -1) { + return NULL; + } else if (ctx->config[i] == NULL) { + return ""; + } else { + return ctx->config[i]; + } +} + +static void sockaddr_to_string(char *buf, size_t len, + const union usa *usa) { + buf[0] = '\0'; +#if defined(USE_IPV6) + inet_ntop(usa->sa.sa_family, usa->sa.sa_family == AF_INET ? + (void *) &usa->sin.sin_addr : + (void *) &usa->sin6.sin6_addr, buf, len); +#elif defined(_WIN32) + // Only Windoze Vista (and newer) have inet_ntop() + strncpy(buf, inet_ntoa(usa->sin.sin_addr), len); +#else + inet_ntop(usa->sa.sa_family, (void *) &usa->sin.sin_addr, buf, len); +#endif +} + +static void cry(struct mg_connection *conn, + PRINTF_FORMAT_STRING(const char *fmt), ...) PRINTF_ARGS(2, 3); + +// Print error message to the opened error log stream. +static void cry(struct mg_connection *conn, const char *fmt, ...) { + char buf[MG_BUF_LEN], src_addr[IP_ADDR_STR_LEN]; + va_list ap; + FILE *fp; + time_t timestamp; + + va_start(ap, fmt); + (void) vsnprintf(buf, sizeof(buf), fmt, ap); + va_end(ap); + + // Do not lock when getting the callback value, here and below. + // I suppose this is fine, since function cannot disappear in the + // same way string option can. + if (conn->ctx->callbacks.log_message == NULL || + conn->ctx->callbacks.log_message(conn, buf) == 0) { + fp = conn->ctx == NULL || conn->ctx->config[ERROR_LOG_FILE] == NULL ? NULL : + fopen(conn->ctx->config[ERROR_LOG_FILE], "a+"); + + if (fp != NULL) { + flockfile(fp); + timestamp = time(NULL); + + sockaddr_to_string(src_addr, sizeof(src_addr), &conn->client.rsa); + fprintf(fp, "[%010lu] [error] [client %s] ", (unsigned long) timestamp, + src_addr); + + if (conn->request_info.request_method != NULL) { + fprintf(fp, "%s %s: ", conn->request_info.request_method, + conn->request_info.uri); + } + + fprintf(fp, "%s", buf); + fputc('\n', fp); + funlockfile(fp); + fclose(fp); + } + } +} + +// Return fake connection structure. Used for logging, if connection +// is not applicable at the moment of logging. +static struct mg_connection *fc(struct mg_context *ctx) { + static struct mg_connection fake_connection; + fake_connection.ctx = ctx; + return &fake_connection; +} + +const char *mg_version(void) { + return MONGOOSE_VERSION; +} + +struct mg_request_info *mg_get_request_info(struct mg_connection *conn) { + return &conn->request_info; +} + +static void mg_strlcpy(register char *dst, register const char *src, size_t n) { + for (; *src != '\0' && n > 1; n--) { + *dst++ = *src++; + } + *dst = '\0'; +} + +static int lowercase(const char *s) { + return tolower(* (const unsigned char *) s); +} + +static int mg_strncasecmp(const char *s1, const char *s2, size_t len) { + int diff = 0; + + if (len > 0) + do { + diff = lowercase(s1++) - lowercase(s2++); + } while (diff == 0 && s1[-1] != '\0' && --len > 0); + + return diff; +} + +static int mg_strcasecmp(const char *s1, const char *s2) { + int diff; + + do { + diff = lowercase(s1++) - lowercase(s2++); + } while (diff == 0 && s1[-1] != '\0'); + + return diff; +} + +static char * mg_strndup(const char *ptr, size_t len) { + char *p; + + if ((p = (char *) malloc(len + 1)) != NULL) { + mg_strlcpy(p, ptr, len + 1); + } + + return p; +} + +static char * mg_strdup(const char *str) { + return mg_strndup(str, strlen(str)); +} + +static const char *mg_strcasestr(const char *big_str, const char *small_str) { + int i, big_len = strlen(big_str), small_len = strlen(small_str); + + for (i = 0; i <= big_len - small_len; i++) { + if (mg_strncasecmp(big_str + i, small_str, small_len) == 0) { + return big_str + i; + } + } + + return NULL; +} + +// Like snprintf(), but never returns negative value, or a value +// that is larger than a supplied buffer. +// Thanks to Adam Zeldis to pointing snprintf()-caused vulnerability +// in his audit report. +static int mg_vsnprintf(struct mg_connection *conn, char *buf, size_t buflen, + const char *fmt, va_list ap) { + int n; + + if (buflen == 0) + return 0; + + n = vsnprintf(buf, buflen, fmt, ap); + + if (n < 0) { + cry(conn, "vsnprintf error"); + n = 0; + } else if (n >= (int) buflen) { + cry(conn, "truncating vsnprintf buffer: [%.*s]", + n > 200 ? 200 : n, buf); + n = (int) buflen - 1; + } + buf[n] = '\0'; + + return n; +} + +static int mg_snprintf(struct mg_connection *conn, char *buf, size_t buflen, + PRINTF_FORMAT_STRING(const char *fmt), ...) + PRINTF_ARGS(4, 5); + +static int mg_snprintf(struct mg_connection *conn, char *buf, size_t buflen, + const char *fmt, ...) { + va_list ap; + int n; + + va_start(ap, fmt); + n = mg_vsnprintf(conn, buf, buflen, fmt, ap); + va_end(ap); + + return n; +} + +// Skip the characters until one of the delimiters characters found. +// 0-terminate resulting word. Skip the delimiter and following whitespaces. +// Advance pointer to buffer to the next word. Return found 0-terminated word. +// Delimiters can be quoted with quotechar. +static char *skip_quoted(char **buf, const char *delimiters, + const char *whitespace, char quotechar) { + char *p, *begin_word, *end_word, *end_whitespace; + + begin_word = *buf; + end_word = begin_word + strcspn(begin_word, delimiters); + + // Check for quotechar + if (end_word > begin_word) { + p = end_word - 1; + while (*p == quotechar) { + // If there is anything beyond end_word, copy it + if (*end_word == '\0') { + + *p = '\0'; + break; + } else { + size_t end_off = strcspn(end_word + 1, delimiters); + memmove (p, end_word, end_off + 1); + p += end_off; // p must correspond to end_word - 1 + end_word += end_off + 1; + } + } + for (p++; p < end_word; p++) { + *p = '\0'; + } + } + + if (*end_word == '\0') { + *buf = end_word; + } else { + end_whitespace = end_word + 1 + strspn(end_word + 1, whitespace); + + for (p = end_word; p < end_whitespace; p++) { + *p = '\0'; + } + + *buf = end_whitespace; + } + + return begin_word; +} + +// Simplified version of skip_quoted without quote char +// and whitespace == delimiters +static char *skip(char **buf, const char *delimiters) { + return skip_quoted(buf, delimiters, delimiters, 0); +} + + +// Return HTTP header value, or NULL if not found. +static const char *get_header(const struct mg_request_info *ri, + const char *name) { + int i; + + for (i = 0; i < ri->num_headers; i++) + if (!mg_strcasecmp(name, ri->http_headers[i].name)) + return ri->http_headers[i].value; + + return NULL; +} + +const char *mg_get_header(const struct mg_connection *conn, const char *name) { + return get_header(&conn->request_info, name); +} + +// A helper function for traversing a comma separated list of values. +// It returns a list pointer shifted to the next value, or NULL if the end +// of the list found. +// Value is stored in val vector. If value has form "x=y", then eq_val +// vector is initialized to point to the "y" part, and val vector length +// is adjusted to point only to "x". +static const char *next_option(const char *list, struct vec *val, + struct vec *eq_val) { + if (list == NULL || *list == '\0') { + // End of the list + list = NULL; + } else { + val->ptr = list; + if ((list = strchr(val->ptr, ',')) != NULL) { + // Comma found. Store length and shift the list ptr + val->len = list - val->ptr; + list++; + } else { + // This value is the last one + list = val->ptr + strlen(val->ptr); + val->len = list - val->ptr; + } + + if (eq_val != NULL) { + // Value has form "x=y", adjust pointers and lengths + // so that val points to "x", and eq_val points to "y". + eq_val->len = 0; + eq_val->ptr = (const char *) memchr(val->ptr, '=', val->len); + if (eq_val->ptr != NULL) { + eq_val->ptr++; // Skip over '=' character + eq_val->len = val->ptr + val->len - eq_val->ptr; + val->len = (eq_val->ptr - val->ptr) - 1; + } + } + } + + return list; +} + +// Perform case-insensitive match of string against pattern +static int match_prefix(const char *pattern, int pattern_len, const char *str) { + const char *or_str; + int i, j, len, res; + + if ((or_str = (const char *) memchr(pattern, '|', pattern_len)) != NULL) { + res = match_prefix(pattern, or_str - pattern, str); + return res > 0 ? res : + match_prefix(or_str + 1, (pattern + pattern_len) - (or_str + 1), str); + } + + i = j = 0; + res = -1; + for (; i < pattern_len; i++, j++) { + if (pattern[i] == '?' && str[j] != '\0') { + continue; + } else if (pattern[i] == '$') { + return str[j] == '\0' ? j : -1; + } else if (pattern[i] == '*') { + i++; + if (pattern[i] == '*') { + i++; + len = (int) strlen(str + j); + } else { + len = (int) strcspn(str + j, "/"); + } + if (i == pattern_len) { + return j + len; + } + do { + res = match_prefix(pattern + i, pattern_len - i, str + j + len); + } while (res == -1 && len-- > 0); + return res == -1 ? -1 : j + res + len; + } else if (lowercase(&pattern[i]) != lowercase(&str[j])) { + return -1; + } + } + return j; +} + +// HTTP 1.1 assumes keep alive if "Connection:" header is not set +// This function must tolerate situations when connection info is not +// set up, for example if request parsing failed. +static int should_keep_alive(const struct mg_connection *conn) { + const char *http_version = conn->request_info.http_version; + const char *header = mg_get_header(conn, "Connection"); + if (conn->must_close || + conn->status_code == 401 || + mg_strcasecmp(conn->ctx->config[ENABLE_KEEP_ALIVE], "yes") != 0 || + (header != NULL && mg_strcasecmp(header, "keep-alive") != 0) || + (header == NULL && http_version && strcmp(http_version, "1.1"))) { + return 0; + } + return 1; +} + +static const char *suggest_connection_header(const struct mg_connection *conn) { + return should_keep_alive(conn) ? "keep-alive" : "close"; +} + +static void send_http_error(struct mg_connection *, int, const char *, + PRINTF_FORMAT_STRING(const char *fmt), ...) + PRINTF_ARGS(4, 5); + + +static void send_http_error(struct mg_connection *conn, int status, + const char *reason, const char *fmt, ...) { + char buf[MG_BUF_LEN]; + va_list ap; + int len = 0; + + conn->status_code = status; + if (conn->ctx->callbacks.http_error == NULL || + conn->ctx->callbacks.http_error(conn, status)) { + buf[0] = '\0'; + + // Errors 1xx, 204 and 304 MUST NOT send a body + if (status > 199 && status != 204 && status != 304) { + len = mg_snprintf(conn, buf, sizeof(buf), "Error %d: %s", status, reason); + buf[len++] = '\n'; + + va_start(ap, fmt); + len += mg_vsnprintf(conn, buf + len, sizeof(buf) - len, fmt, ap); + va_end(ap); + } + DEBUG_TRACE(("[%s]", buf)); + + mg_printf(conn, "HTTP/1.1 %d %s\r\n" + "Content-Length: %d\r\n" + "Connection: %s\r\n\r\n", status, reason, len, + suggest_connection_header(conn)); + conn->num_bytes_sent += mg_printf(conn, "%s", buf); + } +} + +#if defined(_WIN32) && !defined(__SYMBIAN32__) +static int pthread_mutex_init(pthread_mutex_t *mutex, void *unused) { + (void) unused; + *mutex = CreateMutex(NULL, FALSE, NULL); + return *mutex == NULL ? -1 : 0; +} + +static int pthread_mutex_destroy(pthread_mutex_t *mutex) { + return CloseHandle(*mutex) == 0 ? -1 : 0; +} + +static int pthread_mutex_lock(pthread_mutex_t *mutex) { + return WaitForSingleObject(*mutex, INFINITE) == WAIT_OBJECT_0? 0 : -1; +} + +static int pthread_mutex_unlock(pthread_mutex_t *mutex) { + return ReleaseMutex(*mutex) == 0 ? -1 : 0; +} + +static int pthread_cond_init(pthread_cond_t *cv, const void *unused) { + (void) unused; + cv->signal = CreateEvent(NULL, FALSE, FALSE, NULL); + cv->broadcast = CreateEvent(NULL, TRUE, FALSE, NULL); + return cv->signal != NULL && cv->broadcast != NULL ? 0 : -1; +} + +static int pthread_cond_wait(pthread_cond_t *cv, pthread_mutex_t *mutex) { + HANDLE handles[] = {cv->signal, cv->broadcast}; + ReleaseMutex(*mutex); + WaitForMultipleObjects(2, handles, FALSE, INFINITE); + return WaitForSingleObject(*mutex, INFINITE) == WAIT_OBJECT_0? 0 : -1; +} + +static int pthread_cond_signal(pthread_cond_t *cv) { + return SetEvent(cv->signal) == 0 ? -1 : 0; +} + +static int pthread_cond_broadcast(pthread_cond_t *cv) { + // Implementation with PulseEvent() has race condition, see + // http://www.cs.wustl.edu/~schmidt/win32-cv-1.html + return PulseEvent(cv->broadcast) == 0 ? -1 : 0; +} + +static int pthread_cond_destroy(pthread_cond_t *cv) { + return CloseHandle(cv->signal) && CloseHandle(cv->broadcast) ? 0 : -1; +} + +// For Windows, change all slashes to backslashes in path names. +static void change_slashes_to_backslashes(char *path) { + int i; + + for (i = 0; path[i] != '\0'; i++) { + if (path[i] == '/') + path[i] = '\\'; + // i > 0 check is to preserve UNC paths, like \\server\file.txt + if (path[i] == '\\' && i > 0) + while (path[i + 1] == '\\' || path[i + 1] == '/') + (void) memmove(path + i + 1, + path + i + 2, strlen(path + i + 1)); + } +} + +// Encode 'path' which is assumed UTF-8 string, into UNICODE string. +// wbuf and wbuf_len is a target buffer and its length. +static void to_unicode(const char *path, wchar_t *wbuf, size_t wbuf_len) { + char buf[PATH_MAX], buf2[PATH_MAX]; + + mg_strlcpy(buf, path, sizeof(buf)); + change_slashes_to_backslashes(buf); + + // Convert to Unicode and back. If doubly-converted string does not + // match the original, something is fishy, reject. + memset(wbuf, 0, wbuf_len * sizeof(wchar_t)); + MultiByteToWideChar(CP_UTF8, 0, buf, -1, wbuf, (int) wbuf_len); + WideCharToMultiByte(CP_UTF8, 0, wbuf, (int) wbuf_len, buf2, sizeof(buf2), + NULL, NULL); + if (strcmp(buf, buf2) != 0) { + wbuf[0] = L'\0'; + } +} + +#if defined(_WIN32_WCE) +static time_t time(time_t *ptime) { + time_t t; + SYSTEMTIME st; + FILETIME ft; + + GetSystemTime(&st); + SystemTimeToFileTime(&st, &ft); + t = SYS2UNIX_TIME(ft.dwLowDateTime, ft.dwHighDateTime); + + if (ptime != NULL) { + *ptime = t; + } + + return t; +} + +static struct tm *localtime(const time_t *ptime, struct tm *ptm) { + int64_t t = ((int64_t) *ptime) * RATE_DIFF + EPOCH_DIFF; + FILETIME ft, lft; + SYSTEMTIME st; + TIME_ZONE_INFORMATION tzinfo; + + if (ptm == NULL) { + return NULL; + } + + * (int64_t *) &ft = t; + FileTimeToLocalFileTime(&ft, &lft); + FileTimeToSystemTime(&lft, &st); + ptm->tm_year = st.wYear - 1900; + ptm->tm_mon = st.wMonth - 1; + ptm->tm_wday = st.wDayOfWeek; + ptm->tm_mday = st.wDay; + ptm->tm_hour = st.wHour; + ptm->tm_min = st.wMinute; + ptm->tm_sec = st.wSecond; + ptm->tm_yday = 0; // hope nobody uses this + ptm->tm_isdst = + GetTimeZoneInformation(&tzinfo) == TIME_ZONE_ID_DAYLIGHT ? 1 : 0; + + return ptm; +} + +static struct tm *gmtime(const time_t *ptime, struct tm *ptm) { + // FIXME(lsm): fix this. + return localtime(ptime, ptm); +} + +static size_t strftime(char *dst, size_t dst_size, const char *fmt, + const struct tm *tm) { + (void) snprintf(dst, dst_size, "implement strftime() for WinCE"); + return 0; +} +#endif + +// Windows happily opens files with some garbage at the end of file name. +// For example, fopen("a.cgi ", "r") on Windows successfully opens +// "a.cgi", despite one would expect an error back. +// This function returns non-0 if path ends with some garbage. +static int path_cannot_disclose_cgi(const char *path) { + static const char *allowed_last_characters = "_-"; + int last = path[strlen(path) - 1]; + return isalnum(last) || strchr(allowed_last_characters, last) != NULL; +} + +static int mg_stat(struct mg_connection *conn, const char *path, + struct file *filep) { + wchar_t wbuf[PATH_MAX]; + WIN32_FILE_ATTRIBUTE_DATA info; + + if (!is_file_in_memory(conn, path, filep)) { + to_unicode(path, wbuf, ARRAY_SIZE(wbuf)); + if (GetFileAttributesExW(wbuf, GetFileExInfoStandard, &info) != 0) { + filep->size = MAKEUQUAD(info.nFileSizeLow, info.nFileSizeHigh); + filep->modification_time = SYS2UNIX_TIME( + info.ftLastWriteTime.dwLowDateTime, + info.ftLastWriteTime.dwHighDateTime); + filep->is_directory = info.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY; + // If file name is fishy, reset the file structure and return error. + // Note it is important to reset, not just return the error, cause + // functions like is_file_opened() check the struct. + if (!filep->is_directory && !path_cannot_disclose_cgi(path)) { + memset(filep, 0, sizeof(*filep)); + } + } + } + + return filep->membuf != NULL || filep->modification_time != 0; +} + +static int mg_remove(const char *path) { + wchar_t wbuf[PATH_MAX]; + to_unicode(path, wbuf, ARRAY_SIZE(wbuf)); + return DeleteFileW(wbuf) ? 0 : -1; +} + +static int mg_mkdir(const char *path, int mode) { + char buf[PATH_MAX]; + wchar_t wbuf[PATH_MAX]; + + (void) mode; + mg_strlcpy(buf, path, sizeof(buf)); + change_slashes_to_backslashes(buf); + + (void) MultiByteToWideChar(CP_UTF8, 0, buf, -1, wbuf, ARRAY_SIZE(wbuf)); + + return CreateDirectoryW(wbuf, NULL) ? 0 : -1; +} + +// Implementation of POSIX opendir/closedir/readdir for Windows. +static DIR * opendir(const char *name) { + DIR *dir = NULL; + wchar_t wpath[PATH_MAX]; + DWORD attrs; + + if (name == NULL) { + SetLastError(ERROR_BAD_ARGUMENTS); + } else if ((dir = (DIR *) malloc(sizeof(*dir))) == NULL) { + SetLastError(ERROR_NOT_ENOUGH_MEMORY); + } else { + to_unicode(name, wpath, ARRAY_SIZE(wpath)); + attrs = GetFileAttributesW(wpath); + if (attrs != 0xFFFFFFFF && + ((attrs & FILE_ATTRIBUTE_DIRECTORY) == FILE_ATTRIBUTE_DIRECTORY)) { + (void) wcscat(wpath, L"\\*"); + dir->handle = FindFirstFileW(wpath, &dir->info); + dir->result.d_name[0] = '\0'; + } else { + free(dir); + dir = NULL; + } + } + + return dir; +} + +static int closedir(DIR *dir) { + int result = 0; + + if (dir != NULL) { + if (dir->handle != INVALID_HANDLE_VALUE) + result = FindClose(dir->handle) ? 0 : -1; + + free(dir); + } else { + result = -1; + SetLastError(ERROR_BAD_ARGUMENTS); + } + + return result; +} + +static struct dirent *readdir(DIR *dir) { + struct dirent *result = 0; + + if (dir) { + if (dir->handle != INVALID_HANDLE_VALUE) { + result = &dir->result; + (void) WideCharToMultiByte(CP_UTF8, 0, + dir->info.cFileName, -1, result->d_name, + sizeof(result->d_name), NULL, NULL); + + if (!FindNextFileW(dir->handle, &dir->info)) { + (void) FindClose(dir->handle); + dir->handle = INVALID_HANDLE_VALUE; + } + + } else { + SetLastError(ERROR_FILE_NOT_FOUND); + } + } else { + SetLastError(ERROR_BAD_ARGUMENTS); + } + + return result; +} + +static void set_close_on_exec(SOCKET sock) { + (void) SetHandleInformation((HANDLE) sock, HANDLE_FLAG_INHERIT, 0); +} + +int mg_start_thread(mg_thread_func_t f, void *p) { + return (long)_beginthread((void (__cdecl *)(void *)) f, 0, p) == -1L ? -1 : 0; +} + +static HANDLE dlopen(const char *dll_name, int flags) { + wchar_t wbuf[PATH_MAX]; + (void) flags; + to_unicode(dll_name, wbuf, ARRAY_SIZE(wbuf)); + return LoadLibraryW(wbuf); +} + +#if !defined(NO_CGI) +#define SIGKILL 0 +static int kill(pid_t pid, int sig_num) { + (void) TerminateProcess(pid, sig_num); + (void) CloseHandle(pid); + return 0; +} + +static void trim_trailing_whitespaces(char *s) { + char *e = s + strlen(s) - 1; + while (e > s && isspace(* (unsigned char *) e)) { + *e-- = '\0'; + } +} + +static pid_t spawn_process(struct mg_connection *conn, const char *prog, + char *envblk, char *envp[], int fdin, + int fdout, const char *dir) { + HANDLE me; + char *p, *interp, full_interp[PATH_MAX], full_dir[PATH_MAX], + cmdline[PATH_MAX], buf[PATH_MAX]; + struct file file = STRUCT_FILE_INITIALIZER; + STARTUPINFOA si; + PROCESS_INFORMATION pi = { 0 }; + + (void) envp; + + memset(&si, 0, sizeof(si)); + si.cb = sizeof(si); + + // TODO(lsm): redirect CGI errors to the error log file + si.dwFlags = STARTF_USESTDHANDLES | STARTF_USESHOWWINDOW; + si.wShowWindow = SW_HIDE; + + me = GetCurrentProcess(); + DuplicateHandle(me, (HANDLE) _get_osfhandle(fdin), me, + &si.hStdInput, 0, TRUE, DUPLICATE_SAME_ACCESS); + DuplicateHandle(me, (HANDLE) _get_osfhandle(fdout), me, + &si.hStdOutput, 0, TRUE, DUPLICATE_SAME_ACCESS); + + // If CGI file is a script, try to read the interpreter line + interp = conn->ctx->config[CGI_INTERPRETER]; + if (interp == NULL) { + buf[0] = buf[1] = '\0'; + + // Read the first line of the script into the buffer + snprintf(cmdline, sizeof(cmdline), "%s%c%s", dir, '/', prog); + if (mg_fopen(conn, cmdline, "r", &file)) { + p = (char *) file.membuf; + mg_fgets(buf, sizeof(buf), &file, &p); + mg_fclose(&file); + buf[sizeof(buf) - 1] = '\0'; + } + + if (buf[0] == '#' && buf[1] == '!') { + trim_trailing_whitespaces(buf + 2); + } else { + buf[2] = '\0'; + } + interp = buf + 2; + } + + if (interp[0] != '\0') { + GetFullPathNameA(interp, sizeof(full_interp), full_interp, NULL); + interp = full_interp; + } + GetFullPathNameA(dir, sizeof(full_dir), full_dir, NULL); + + mg_snprintf(conn, cmdline, sizeof(cmdline), "%s%s\"%s\\%s\"", + interp, interp[0] == '\0' ? "" : " ", full_dir, prog); + + DEBUG_TRACE(("Running [%s]", cmdline)); + if (CreateProcessA(NULL, cmdline, NULL, NULL, TRUE, + CREATE_NEW_PROCESS_GROUP, envblk, NULL, &si, &pi) == 0) { + cry(conn, "%s: CreateProcess(%s): %ld", + __func__, cmdline, ERRNO); + pi.hProcess = (pid_t) -1; + } + + (void) CloseHandle(si.hStdOutput); + (void) CloseHandle(si.hStdInput); + (void) CloseHandle(pi.hThread); + + return (pid_t) pi.hProcess; +} +#endif // !NO_CGI + +static int set_non_blocking_mode(SOCKET sock) { + unsigned long on = 1; + return ioctlsocket(sock, FIONBIO, &on); +} + +#else +static int mg_stat(struct mg_connection *conn, const char *path, + struct file *filep) { + struct stat st; + + if (!is_file_in_memory(conn, path, filep) && !stat(path, &st)) { + filep->size = st.st_size; + filep->modification_time = st.st_mtime; + filep->is_directory = S_ISDIR(st.st_mode); + } else { + filep->modification_time = (time_t) 0; + } + + return filep->membuf != NULL || filep->modification_time != (time_t) 0; +} + +static void set_close_on_exec(int fd) { + fcntl(fd, F_SETFD, FD_CLOEXEC); +} + +int mg_start_thread(mg_thread_func_t func, void *param) { + pthread_t thread_id; + pthread_attr_t attr; + int result; + struct mg_context* ctx = param; + char* stacksize = ctx->config[THREAD_STACK_SIZE]; + char* priority = ctx->config[THREAD_PRIORITY]; + char* policy = ctx->config[THREAD_POLICY]; + int noinheritsched = 0; + + (void) pthread_attr_init(&attr); + (void) pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED); + +#if USE_STACK_SIZE > 1 + // Compile-time option to control stack size, e.g. -DUSE_STACK_SIZE=16384; Can be overridden + if (stacksize == NULL) + (void) pthread_attr_setstacksize(&attr, USE_STACK_SIZE); +#endif + + if (stacksize != NULL) { + size_t size = atoi(stacksize); + (void) pthread_attr_setstacksize(&attr, size); + } + + if (priority != NULL) { + struct sched_param sched_param; + memset(&sched_param, 0, sizeof(sched_param)); + sched_param.sched_priority = atoi(priority); + (void) pthread_attr_setschedparam(&attr, &sched_param); + noinheritsched = 1; + } + + if (policy != NULL) { + int p_policy; + (void) pthread_attr_getschedpolicy(&attr, &p_policy); + + switch (policy[0]) { + case 'o': + p_policy = SCHED_OTHER; + break; + case 'f': + p_policy = SCHED_FIFO; + break; + case 'r': + p_policy = SCHED_RR; + break; +#if defined(_POSIX_SPORADIC_SERVER) || defined(_POSIX_THREAD_SPORADIC_SERVER) + case 's': + p_policy = SCHED_SPORADIC; + break; +#endif + default: + cry(fc(ctx), "%s: Unknown scheduler: %s", __func__, policy); + break; + } + + (void) pthread_attr_setschedpolicy(&attr, p_policy); + + noinheritsched = 1; + } + + if (noinheritsched != 0) { + (void) pthread_attr_setinheritsched(&attr, PTHREAD_EXPLICIT_SCHED); + } + + result = pthread_create(&thread_id, &attr, func, param); + pthread_attr_destroy(&attr); + + return result; +} + +#ifndef NO_CGI +static pid_t spawn_process(struct mg_connection *conn, const char *prog, + char *envblk, char *envp[], int fdin, + int fdout, const char *dir) { + pid_t pid; + const char *interp; + + (void) envblk; + + if ((pid = fork()) == -1) { + // Parent + send_http_error(conn, 500, http_500_error, "fork(): %s", strerror(ERRNO)); + } else if (pid == 0) { + // Child + if (chdir(dir) != 0) { + cry(conn, "%s: chdir(%s): %s", __func__, dir, strerror(ERRNO)); + } else if (dup2(fdin, 0) == -1) { + cry(conn, "%s: dup2(%d, 0): %s", __func__, fdin, strerror(ERRNO)); + } else if (dup2(fdout, 1) == -1) { + cry(conn, "%s: dup2(%d, 1): %s", __func__, fdout, strerror(ERRNO)); + } else { + // Not redirecting stderr to stdout, to avoid output being littered + // with the error messages. + (void) close(fdin); + (void) close(fdout); + + // After exec, all signal handlers are restored to their default values, + // with one exception of SIGCHLD. According to POSIX.1-2001 and Linux's + // implementation, SIGCHLD's handler will leave unchanged after exec + // if it was set to be ignored. Restore it to default action. + signal(SIGCHLD, SIG_DFL); + + interp = conn->ctx->config[CGI_INTERPRETER]; + if (interp == NULL) { + (void) execle(prog, prog, NULL, envp); + cry(conn, "%s: execle(%s): %s", __func__, prog, strerror(ERRNO)); + } else { + (void) execle(interp, interp, prog, NULL, envp); + cry(conn, "%s: execle(%s %s): %s", __func__, interp, prog, + strerror(ERRNO)); + } + } + exit(EXIT_FAILURE); + } + + return pid; +} +#endif // !NO_CGI + +static int set_non_blocking_mode(SOCKET sock) { + int flags; + + flags = fcntl(sock, F_GETFL, 0); + (void) fcntl(sock, F_SETFL, flags | O_NONBLOCK); + + return 0; +} +#endif // _WIN32 + +#ifndef HAVE_POLL +static int poll(struct pollfd *pfd, int n, int milliseconds) { + struct timeval tv; + fd_set set; + int i, result; + SOCKET maxfd = 0; + + tv.tv_sec = milliseconds / 1000; + tv.tv_usec = (milliseconds % 1000) * 1000; + FD_ZERO(&set); + + for (i = 0; i < n; i++) { + FD_SET((SOCKET) pfd[i].fd, &set); + pfd[i].revents = 0; + + if (pfd[i].fd > maxfd) { + maxfd = pfd[i].fd; + } + } + + if ((result = select(maxfd + 1, &set, NULL, NULL, &tv)) > 0) { + for (i = 0; i < n; i++) { + if (FD_ISSET(pfd[i].fd, &set)) { + pfd[i].revents = POLLIN; + } + } + } + + return result; +} +#endif // HAVE_POLL + +// Write data to the IO channel - opened file descriptor, socket or SSL +// descriptor. Return number of bytes written. +static int64_t push(FILE *fp, SOCKET sock, SSL *ssl, const char *buf, + int64_t len) { + int64_t sent; + int n, k; + + (void) ssl; // Get rid of warning + sent = 0; + while (sent < len) { + + // How many bytes we send in this iteration + k = len - sent > INT_MAX ? INT_MAX : (int) (len - sent); + +#ifndef NO_SSL + if (ssl != NULL) { + n = SSL_write(ssl, buf + sent, k); + } else +#endif + if (fp != NULL) { + n = (int) fwrite(buf + sent, 1, (size_t) k, fp); + if (ferror(fp)) + n = -1; + } else { + n = send(sock, buf + sent, (size_t) k, MSG_NOSIGNAL); + } + + if (n <= 0) + break; + + sent += n; + } + + return sent; +} + +// Read from IO channel - opened file descriptor, socket, or SSL descriptor. +// Return negative value on error, or number of bytes read on success. +static int pull(FILE *fp, struct mg_connection *conn, char *buf, int len) { + int nread; + + if (fp != NULL) { + // Use read() instead of fread(), because if we're reading from the CGI + // pipe, fread() may block until IO buffer is filled up. We cannot afford + // to block and must pass all read bytes immediately to the client. + nread = read(fileno(fp), buf, (size_t) len); +#ifndef NO_SSL + } else if (conn->ssl != NULL) { + nread = SSL_read(conn->ssl, buf, len); +#endif + } else { + nread = recv(conn->client.sock, buf, (size_t) len, 0); + } + + return conn->ctx->stop_flag ? -1 : nread; +} + +static int pull_all(FILE *fp, struct mg_connection *conn, char *buf, int len) { + int n, nread = 0; + + while (len > 0 && conn->ctx->stop_flag == 0) { + n = pull(fp, conn, buf + nread, len); + if (n < 0) { + nread = n; // Propagate the error + break; + } else if (n == 0) { + break; // No more data to read + } else { + conn->consumed_content += n; + nread += n; + len -= n; + } + } + + return nread; +} + +int mg_read(struct mg_connection *conn, void *buf, size_t len) { + int n, buffered_len, nread; + const char *body; + + // If Content-Length is not set, read until socket is closed + if (conn->consumed_content == 0 && conn->content_len == 0) { + conn->content_len = INT64_MAX; + conn->must_close = 1; + } + + nread = 0; + if (conn->consumed_content < conn->content_len) { + // Adjust number of bytes to read. + int64_t to_read = conn->content_len - conn->consumed_content; + if (to_read < (int64_t) len) { + len = (size_t) to_read; + } + + // Return buffered data + body = conn->buf + conn->request_len + conn->consumed_content; + buffered_len = &conn->buf[conn->data_len] - body; + if (buffered_len > 0) { + if (len < (size_t) buffered_len) { + buffered_len = (int) len; + } + memcpy(buf, body, (size_t) buffered_len); + len -= buffered_len; + conn->consumed_content += buffered_len; + nread += buffered_len; + buf = (char *) buf + buffered_len; + } + + // We have returned all buffered data. Read new data from the remote socket. + n = pull_all(NULL, conn, (char *) buf, (int) len); + nread = n >= 0 ? nread + n : n; + } + return nread; +} + +int mg_write(struct mg_connection *conn, const void *buf, size_t len) { + time_t now; + int64_t n, total, allowed; + + if (conn->throttle > 0) { + if ((now = time(NULL)) != conn->last_throttle_time) { + conn->last_throttle_time = now; + conn->last_throttle_bytes = 0; + } + allowed = conn->throttle - conn->last_throttle_bytes; + if (allowed > (int64_t) len) { + allowed = len; + } + if ((total = push(NULL, conn->client.sock, conn->ssl, (const char *) buf, + (int64_t) allowed)) == allowed) { + buf = (char *) buf + total; + conn->last_throttle_bytes += total; + while (total < (int64_t) len && conn->ctx->stop_flag == 0) { + allowed = conn->throttle > (int64_t) len - total ? + (int64_t) len - total : conn->throttle; + if ((n = push(NULL, conn->client.sock, conn->ssl, (const char *) buf, + (int64_t) allowed)) != allowed) { + break; + } + sleep(1); + conn->last_throttle_bytes = allowed; + conn->last_throttle_time = time(NULL); + buf = (char *) buf + n; + total += n; + } + } + } else { + total = push(NULL, conn->client.sock, conn->ssl, (const char *) buf, + (int64_t) len); + } + return (int) total; +} + +// Alternative alloc_vprintf() for non-compliant C runtimes +static int alloc_vprintf2(char **buf, const char *fmt, va_list ap) { + va_list ap_copy; + int size = MG_BUF_LEN; + int len = -1; + + *buf = NULL; + while (len == -1) { + if (*buf) free(*buf); + *buf = malloc(size *= 4); + if (!*buf) break; + va_copy(ap_copy, ap); + len = vsnprintf(*buf, size, fmt, ap_copy); + } + + return len; +} + +// Print message to buffer. If buffer is large enough to hold the message, +// return buffer. If buffer is to small, allocate large enough buffer on heap, +// and return allocated buffer. +static int alloc_vprintf(char **buf, size_t size, const char *fmt, va_list ap) { + va_list ap_copy; + int len; + + // Windows is not standard-compliant, and vsnprintf() returns -1 if + // buffer is too small. Also, older versions of msvcrt.dll do not have + // _vscprintf(). However, if size is 0, vsnprintf() behaves correctly. + // Therefore, we make two passes: on first pass, get required message length. + // On second pass, actually print the message. + va_copy(ap_copy, ap); + len = vsnprintf(NULL, 0, fmt, ap_copy); + + if (len < 0) { + // C runtime is not standard compliant, vsnprintf() returned -1. + // Switch to alternative code path that uses incremental allocations. + va_copy(ap_copy, ap); + len = alloc_vprintf2(buf, fmt, ap); + } else if (len > (int) size && + (size = len + 1) > 0 && + (*buf = (char *) malloc(size)) == NULL) { + len = -1; // Allocation failed, mark failure + } else { + va_copy(ap_copy, ap); + vsnprintf(*buf, size, fmt, ap_copy); + } + + return len; +} + +static int mg_vprintf(struct mg_connection *conn, const char *fmt, va_list ap) { + char mem[MG_BUF_LEN], *buf = mem; + int len; + + if ((len = alloc_vprintf(&buf, sizeof(mem), fmt, ap)) > 0) { + len = mg_write(conn, buf, (size_t) len); + } + if (buf != mem && buf != NULL) { + free(buf); + } + + return len; +} + +int mg_printf(struct mg_connection *conn, const char *fmt, ...) { + va_list ap; + va_start(ap, fmt); + return mg_vprintf(conn, fmt, ap); +} + +int mg_url_decode(const char *src, int src_len, char *dst, + int dst_len, int is_form_url_encoded) { + int i, j, a, b; +#define HEXTOI(x) (isdigit(x) ? x - '0' : x - 'W') + + for (i = j = 0; i < src_len && j < dst_len - 1; i++, j++) { + if (src[i] == '%' && i < src_len - 2 && + isxdigit(* (const unsigned char *) (src + i + 1)) && + isxdigit(* (const unsigned char *) (src + i + 2))) { + a = tolower(* (const unsigned char *) (src + i + 1)); + b = tolower(* (const unsigned char *) (src + i + 2)); + dst[j] = (char) ((HEXTOI(a) << 4) | HEXTOI(b)); + i += 2; + } else if (is_form_url_encoded && src[i] == '+') { + dst[j] = ' '; + } else { + dst[j] = src[i]; + } + } + + dst[j] = '\0'; // Null-terminate the destination + + return i >= src_len ? j : -1; +} + +int mg_get_var(const char *data, size_t data_len, const char *name, + char *dst, size_t dst_len) { + const char *p, *e, *s; + size_t name_len; + int len; + + if (dst == NULL || dst_len == 0) { + len = -2; + } else if (data == NULL || name == NULL || data_len == 0) { + len = -1; + dst[0] = '\0'; + } else { + name_len = strlen(name); + e = data + data_len; + len = -1; + dst[0] = '\0'; + + // data is "var1=val1&var2=val2...". Find variable first + for (p = data; p + name_len < e; p++) { + if ((p == data || p[-1] == '&') && p[name_len] == '=' && + !mg_strncasecmp(name, p, name_len)) { + + // Point p to variable value + p += name_len + 1; + + // Point s to the end of the value + s = (const char *) memchr(p, '&', (size_t)(e - p)); + if (s == NULL) { + s = e; + } + assert(s >= p); + + // Decode variable into destination buffer + len = mg_url_decode(p, (size_t)(s - p), dst, dst_len, 1); + + // Redirect error code from -1 to -2 (destination buffer too small). + if (len == -1) { + len = -2; + } + break; + } + } + } + + return len; +} + +int mg_get_cookie(const char *cookie_header, const char *var_name, + char *dst, size_t dst_size) { + const char *s, *p, *end; + int name_len, len = -1; + + if (dst == NULL || dst_size == 0) { + len = -2; + } else if (var_name == NULL || (s = cookie_header) == NULL) { + len = -1; + dst[0] = '\0'; + } else { + name_len = (int) strlen(var_name); + end = s + strlen(s); + dst[0] = '\0'; + + for (; (s = mg_strcasestr(s, var_name)) != NULL; s += name_len) { + if (s[name_len] == '=') { + s += name_len + 1; + if ((p = strchr(s, ' ')) == NULL) + p = end; + if (p[-1] == ';') + p--; + if (*s == '"' && p[-1] == '"' && p > s + 1) { + s++; + p--; + } + if ((size_t) (p - s) < dst_size) { + len = p - s; + mg_strlcpy(dst, s, (size_t) len + 1); + } else { + len = -3; + } + break; + } + } + } + return len; +} + +static void convert_uri_to_file_name(struct mg_connection *conn, char *buf, + size_t buf_len, struct file *filep) { + struct vec a, b; + const char *rewrite, *uri = conn->request_info.uri, + *root = conn->ctx->config[DOCUMENT_ROOT]; + char *p; + int match_len; + char gz_path[PATH_MAX]; + char const* accept_encoding; + + // Using buf_len - 1 because memmove() for PATH_INFO may shift part + // of the path one byte on the right. + // If document_root is NULL, leave the file empty. + mg_snprintf(conn, buf, buf_len - 1, "%s%s", + root == NULL ? "" : root, + root == NULL ? "" : uri); + + rewrite = conn->ctx->config[REWRITE]; + while ((rewrite = next_option(rewrite, &a, &b)) != NULL) { + if ((match_len = match_prefix(a.ptr, a.len, uri)) > 0) { + mg_snprintf(conn, buf, buf_len - 1, "%.*s%s", (int) b.len, b.ptr, + uri + match_len); + break; + } + } + + if (mg_stat(conn, buf, filep)) return; + + // if we can't find the actual file, look for the file + // with the same name but a .gz extension. If we find it, + // use that and set the gzipped flag in the file struct + // to indicate that the response need to have the content- + // encoding: gzip header + // we can only do this if the browser declares support + if ((accept_encoding = mg_get_header(conn, "Accept-Encoding")) != NULL) { + if (strstr(accept_encoding,"gzip") != NULL) { + snprintf(gz_path, sizeof(gz_path), "%s.gz", buf); + if (mg_stat(conn, gz_path, filep)) { + filep->gzipped = 1; + return; + } + } + } + + // Support PATH_INFO for CGI scripts. + for (p = buf + strlen(buf); p > buf + 1; p--) { + if (*p == '/') { + *p = '\0'; + if (match_prefix(conn->ctx->config[CGI_EXTENSIONS], + strlen(conn->ctx->config[CGI_EXTENSIONS]), buf) > 0 && + mg_stat(conn, buf, filep)) { + // Shift PATH_INFO block one character right, e.g. + // "/x.cgi/foo/bar\x00" => "/x.cgi\x00/foo/bar\x00" + // conn->path_info is pointing to the local variable "path" declared + // in handle_request(), so PATH_INFO is not valid after + // handle_request returns. + conn->path_info = p + 1; + memmove(p + 2, p + 1, strlen(p + 1) + 1); // +1 is for trailing \0 + p[1] = '/'; + break; + } else { + *p = '/'; + } + } + } +} + +// Check whether full request is buffered. Return: +// -1 if request is malformed +// 0 if request is not yet fully buffered +// >0 actual request length, including last \r\n\r\n +static int get_request_len(const char *buf, int buflen) { + const char *s, *e; + int len = 0; + + for (s = buf, e = s + buflen - 1; len <= 0 && s < e; s++) + // Control characters are not allowed but >=128 is. + if (!isprint(* (const unsigned char *) s) && *s != '\r' && + *s != '\n' && * (const unsigned char *) s < 128) { + len = -1; + break; // [i_a] abort scan as soon as one malformed character is found; + // don't let subsequent \r\n\r\n win us over anyhow + } else if (s[0] == '\n' && s[1] == '\n') { + len = (int) (s - buf) + 2; + } else if (s[0] == '\n' && &s[1] < e && + s[1] == '\r' && s[2] == '\n') { + len = (int) (s - buf) + 3; + } + + return len; +} + +// Convert month to the month number. Return -1 on error, or month number +static int get_month_index(const char *s) { + size_t i; + + for (i = 0; i < ARRAY_SIZE(month_names); i++) + if (!strcmp(s, month_names[i])) + return (int) i; + + return -1; +} + +static int num_leap_years(int year) { + return year / 4 - year / 100 + year / 400; +} + +// Parse UTC date-time string, and return the corresponding time_t value. +static time_t parse_date_string(const char *datetime) { + static const unsigned short days_before_month[] = { + 0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334 + }; + char month_str[32]; + int second, minute, hour, day, month, year, leap_days, days; + time_t result = (time_t) 0; + + if (((sscanf(datetime, "%d/%3s/%d %d:%d:%d", + &day, month_str, &year, &hour, &minute, &second) == 6) || + (sscanf(datetime, "%d %3s %d %d:%d:%d", + &day, month_str, &year, &hour, &minute, &second) == 6) || + (sscanf(datetime, "%*3s, %d %3s %d %d:%d:%d", + &day, month_str, &year, &hour, &minute, &second) == 6) || + (sscanf(datetime, "%d-%3s-%d %d:%d:%d", + &day, month_str, &year, &hour, &minute, &second) == 6)) && + year > 1970 && + (month = get_month_index(month_str)) != -1) { + leap_days = num_leap_years(year) - num_leap_years(1970); + year -= 1970; + days = year * 365 + days_before_month[month] + (day - 1) + leap_days; + result = days * 24 * 3600 + hour * 3600 + minute * 60 + second; + } + + return result; +} + +// Protect against directory disclosure attack by removing '..', +// excessive '/' and '\' characters +static void remove_double_dots_and_double_slashes(char *s) { + char *p = s; + + while (*s != '\0') { + *p++ = *s++; + if (s[-1] == '/' || s[-1] == '\\') { + // Skip all following slashes, backslashes and double-dots + while (s[0] != '\0') { + if (s[0] == '/' || s[0] == '\\') { + s++; + } else if (s[0] == '.' && s[1] == '.') { + s += 2; + } else { + break; + } + } + } + } + *p = '\0'; +} + +static const struct { + const char *extension; + size_t ext_len; + const char *mime_type; +} builtin_mime_types[] = { + {".html", 5, "text/html"}, + {".htm", 4, "text/html"}, + {".shtm", 5, "text/html"}, + {".shtml", 6, "text/html"}, + {".css", 4, "text/css"}, + {".js", 3, "application/x-javascript"}, + {".ico", 4, "image/x-icon"}, + {".gif", 4, "image/gif"}, + {".jpg", 4, "image/jpeg"}, + {".jpeg", 5, "image/jpeg"}, + {".png", 4, "image/png"}, + {".svg", 4, "image/svg+xml"}, + {".txt", 4, "text/plain"}, + {".torrent", 8, "application/x-bittorrent"}, + {".wav", 4, "audio/x-wav"}, + {".mp3", 4, "audio/x-mp3"}, + {".mid", 4, "audio/mid"}, + {".m3u", 4, "audio/x-mpegurl"}, + {".ogg", 4, "audio/ogg"}, + {".ram", 4, "audio/x-pn-realaudio"}, + {".xml", 4, "text/xml"}, + {".json", 5, "text/json"}, + {".xslt", 5, "application/xml"}, + {".xsl", 4, "application/xml"}, + {".ra", 3, "audio/x-pn-realaudio"}, + {".doc", 4, "application/msword"}, + {".exe", 4, "application/octet-stream"}, + {".zip", 4, "application/x-zip-compressed"}, + {".xls", 4, "application/excel"}, + {".tgz", 4, "application/x-tar-gz"}, + {".tar", 4, "application/x-tar"}, + {".gz", 3, "application/x-gunzip"}, + {".arj", 4, "application/x-arj-compressed"}, + {".rar", 4, "application/x-arj-compressed"}, + {".rtf", 4, "application/rtf"}, + {".pdf", 4, "application/pdf"}, + {".swf", 4, "application/x-shockwave-flash"}, + {".mpg", 4, "video/mpeg"}, + {".webm", 5, "video/webm"}, + {".mpeg", 5, "video/mpeg"}, + {".mov", 4, "video/quicktime"}, + {".mp4", 4, "video/mp4"}, + {".m4v", 4, "video/x-m4v"}, + {".asf", 4, "video/x-ms-asf"}, + {".avi", 4, "video/x-msvideo"}, + {".bmp", 4, "image/bmp"}, + {".ttf", 4, "application/x-font-ttf"}, + {NULL, 0, NULL} +}; + +const char *mg_get_builtin_mime_type(const char *path) { + const char *ext; + size_t i, path_len; + + path_len = strlen(path); + + for (i = 0; builtin_mime_types[i].extension != NULL; i++) { + ext = path + (path_len - builtin_mime_types[i].ext_len); + if (path_len > builtin_mime_types[i].ext_len && + mg_strcasecmp(ext, builtin_mime_types[i].extension) == 0) { + return builtin_mime_types[i].mime_type; + } + } + + return "text/plain"; +} + +// Look at the "path" extension and figure what mime type it has. +// Store mime type in the vector. +static void get_mime_type(struct mg_context *ctx, const char *path, + struct vec *vec) { + struct vec ext_vec, mime_vec; + const char *list, *ext; + size_t path_len; + + path_len = strlen(path); + + // Scan user-defined mime types first, in case user wants to + // override default mime types. + list = ctx->config[EXTRA_MIME_TYPES]; + while ((list = next_option(list, &ext_vec, &mime_vec)) != NULL) { + // ext now points to the path suffix + ext = path + path_len - ext_vec.len; + if (mg_strncasecmp(ext, ext_vec.ptr, ext_vec.len) == 0) { + *vec = mime_vec; + return; + } + } + + vec->ptr = mg_get_builtin_mime_type(path); + vec->len = strlen(vec->ptr); +} + +static int is_big_endian(void) { + static const int n = 1; + return ((char *) &n)[0] == 0; +} + +#ifndef HAVE_MD5 +typedef struct MD5Context { + uint32_t buf[4]; + uint32_t bits[2]; + unsigned char in[64]; +} MD5_CTX; + +static void byteReverse(unsigned char *buf, unsigned longs) { + uint32_t t; + + // Forrest: MD5 expect LITTLE_ENDIAN, swap if BIG_ENDIAN + if (is_big_endian()) { + do { + t = (uint32_t) ((unsigned) buf[3] << 8 | buf[2]) << 16 | + ((unsigned) buf[1] << 8 | buf[0]); + * (uint32_t *) buf = t; + buf += 4; + } while (--longs); + } +} + +#define F1(x, y, z) (z ^ (x & (y ^ z))) +#define F2(x, y, z) F1(z, x, y) +#define F3(x, y, z) (x ^ y ^ z) +#define F4(x, y, z) (y ^ (x | ~z)) + +#define MD5STEP(f, w, x, y, z, data, s) \ + ( w += f(x, y, z) + data, w = w<>(32-s), w += x ) + +// Start MD5 accumulation. Set bit count to 0 and buffer to mysterious +// initialization constants. +static void MD5Init(MD5_CTX *ctx) { + ctx->buf[0] = 0x67452301; + ctx->buf[1] = 0xefcdab89; + ctx->buf[2] = 0x98badcfe; + ctx->buf[3] = 0x10325476; + + ctx->bits[0] = 0; + ctx->bits[1] = 0; +} + +static void MD5Transform(uint32_t buf[4], uint32_t const in[16]) { + register uint32_t a, b, c, d; + + a = buf[0]; + b = buf[1]; + c = buf[2]; + d = buf[3]; + + MD5STEP(F1, a, b, c, d, in[0] + 0xd76aa478, 7); + MD5STEP(F1, d, a, b, c, in[1] + 0xe8c7b756, 12); + MD5STEP(F1, c, d, a, b, in[2] + 0x242070db, 17); + MD5STEP(F1, b, c, d, a, in[3] + 0xc1bdceee, 22); + MD5STEP(F1, a, b, c, d, in[4] + 0xf57c0faf, 7); + MD5STEP(F1, d, a, b, c, in[5] + 0x4787c62a, 12); + MD5STEP(F1, c, d, a, b, in[6] + 0xa8304613, 17); + MD5STEP(F1, b, c, d, a, in[7] + 0xfd469501, 22); + MD5STEP(F1, a, b, c, d, in[8] + 0x698098d8, 7); + MD5STEP(F1, d, a, b, c, in[9] + 0x8b44f7af, 12); + MD5STEP(F1, c, d, a, b, in[10] + 0xffff5bb1, 17); + MD5STEP(F1, b, c, d, a, in[11] + 0x895cd7be, 22); + MD5STEP(F1, a, b, c, d, in[12] + 0x6b901122, 7); + MD5STEP(F1, d, a, b, c, in[13] + 0xfd987193, 12); + MD5STEP(F1, c, d, a, b, in[14] + 0xa679438e, 17); + MD5STEP(F1, b, c, d, a, in[15] + 0x49b40821, 22); + + MD5STEP(F2, a, b, c, d, in[1] + 0xf61e2562, 5); + MD5STEP(F2, d, a, b, c, in[6] + 0xc040b340, 9); + MD5STEP(F2, c, d, a, b, in[11] + 0x265e5a51, 14); + MD5STEP(F2, b, c, d, a, in[0] + 0xe9b6c7aa, 20); + MD5STEP(F2, a, b, c, d, in[5] + 0xd62f105d, 5); + MD5STEP(F2, d, a, b, c, in[10] + 0x02441453, 9); + MD5STEP(F2, c, d, a, b, in[15] + 0xd8a1e681, 14); + MD5STEP(F2, b, c, d, a, in[4] + 0xe7d3fbc8, 20); + MD5STEP(F2, a, b, c, d, in[9] + 0x21e1cde6, 5); + MD5STEP(F2, d, a, b, c, in[14] + 0xc33707d6, 9); + MD5STEP(F2, c, d, a, b, in[3] + 0xf4d50d87, 14); + MD5STEP(F2, b, c, d, a, in[8] + 0x455a14ed, 20); + MD5STEP(F2, a, b, c, d, in[13] + 0xa9e3e905, 5); + MD5STEP(F2, d, a, b, c, in[2] + 0xfcefa3f8, 9); + MD5STEP(F2, c, d, a, b, in[7] + 0x676f02d9, 14); + MD5STEP(F2, b, c, d, a, in[12] + 0x8d2a4c8a, 20); + + MD5STEP(F3, a, b, c, d, in[5] + 0xfffa3942, 4); + MD5STEP(F3, d, a, b, c, in[8] + 0x8771f681, 11); + MD5STEP(F3, c, d, a, b, in[11] + 0x6d9d6122, 16); + MD5STEP(F3, b, c, d, a, in[14] + 0xfde5380c, 23); + MD5STEP(F3, a, b, c, d, in[1] + 0xa4beea44, 4); + MD5STEP(F3, d, a, b, c, in[4] + 0x4bdecfa9, 11); + MD5STEP(F3, c, d, a, b, in[7] + 0xf6bb4b60, 16); + MD5STEP(F3, b, c, d, a, in[10] + 0xbebfbc70, 23); + MD5STEP(F3, a, b, c, d, in[13] + 0x289b7ec6, 4); + MD5STEP(F3, d, a, b, c, in[0] + 0xeaa127fa, 11); + MD5STEP(F3, c, d, a, b, in[3] + 0xd4ef3085, 16); + MD5STEP(F3, b, c, d, a, in[6] + 0x04881d05, 23); + MD5STEP(F3, a, b, c, d, in[9] + 0xd9d4d039, 4); + MD5STEP(F3, d, a, b, c, in[12] + 0xe6db99e5, 11); + MD5STEP(F3, c, d, a, b, in[15] + 0x1fa27cf8, 16); + MD5STEP(F3, b, c, d, a, in[2] + 0xc4ac5665, 23); + + MD5STEP(F4, a, b, c, d, in[0] + 0xf4292244, 6); + MD5STEP(F4, d, a, b, c, in[7] + 0x432aff97, 10); + MD5STEP(F4, c, d, a, b, in[14] + 0xab9423a7, 15); + MD5STEP(F4, b, c, d, a, in[5] + 0xfc93a039, 21); + MD5STEP(F4, a, b, c, d, in[12] + 0x655b59c3, 6); + MD5STEP(F4, d, a, b, c, in[3] + 0x8f0ccc92, 10); + MD5STEP(F4, c, d, a, b, in[10] + 0xffeff47d, 15); + MD5STEP(F4, b, c, d, a, in[1] + 0x85845dd1, 21); + MD5STEP(F4, a, b, c, d, in[8] + 0x6fa87e4f, 6); + MD5STEP(F4, d, a, b, c, in[15] + 0xfe2ce6e0, 10); + MD5STEP(F4, c, d, a, b, in[6] + 0xa3014314, 15); + MD5STEP(F4, b, c, d, a, in[13] + 0x4e0811a1, 21); + MD5STEP(F4, a, b, c, d, in[4] + 0xf7537e82, 6); + MD5STEP(F4, d, a, b, c, in[11] + 0xbd3af235, 10); + MD5STEP(F4, c, d, a, b, in[2] + 0x2ad7d2bb, 15); + MD5STEP(F4, b, c, d, a, in[9] + 0xeb86d391, 21); + + buf[0] += a; + buf[1] += b; + buf[2] += c; + buf[3] += d; +} + +static void MD5Update(MD5_CTX *ctx, unsigned char const *buf, unsigned len) { + uint32_t t; + + t = ctx->bits[0]; + if ((ctx->bits[0] = t + ((uint32_t) len << 3)) < t) + ctx->bits[1]++; + ctx->bits[1] += len >> 29; + + t = (t >> 3) & 0x3f; + + if (t) { + unsigned char *p = (unsigned char *) ctx->in + t; + + t = 64 - t; + if (len < t) { + memcpy(p, buf, len); + return; + } + memcpy(p, buf, t); + byteReverse(ctx->in, 16); + MD5Transform(ctx->buf, (uint32_t *) ctx->in); + buf += t; + len -= t; + } + + while (len >= 64) { + memcpy(ctx->in, buf, 64); + byteReverse(ctx->in, 16); + MD5Transform(ctx->buf, (uint32_t *) ctx->in); + buf += 64; + len -= 64; + } + + memcpy(ctx->in, buf, len); +} + +static void MD5Final(unsigned char digest[16], MD5_CTX *ctx) { + unsigned count; + unsigned char *p; + uint32_t *a; + + count = (ctx->bits[0] >> 3) & 0x3F; + + p = ctx->in + count; + *p++ = 0x80; + count = 64 - 1 - count; + if (count < 8) { + memset(p, 0, count); + byteReverse(ctx->in, 16); + MD5Transform(ctx->buf, (uint32_t *) ctx->in); + memset(ctx->in, 0, 56); + } else { + memset(p, 0, count - 8); + } + byteReverse(ctx->in, 14); + + a = (uint32_t *)ctx->in; + a[14] = ctx->bits[0]; + a[15] = ctx->bits[1]; + + MD5Transform(ctx->buf, (uint32_t *) ctx->in); + byteReverse((unsigned char *) ctx->buf, 4); + memcpy(digest, ctx->buf, 16); + memset((char *) ctx, 0, sizeof(*ctx)); +} +#endif // !HAVE_MD5 + +// Stringify binary data. Output buffer must be twice as big as input, +// because each byte takes 2 bytes in string representation +static void bin2str(char *to, const unsigned char *p, size_t len) { + static const char *hex = "0123456789abcdef"; + + for (; len--; p++) { + *to++ = hex[p[0] >> 4]; + *to++ = hex[p[0] & 0x0f]; + } + *to = '\0'; +} + +// Return stringified MD5 hash for list of strings. Buffer must be 33 bytes. +char *mg_md5(char buf[33], ...) { + unsigned char hash[16]; + const char *p; + va_list ap; + MD5_CTX ctx; + + MD5Init(&ctx); + + va_start(ap, buf); + while ((p = va_arg(ap, const char *)) != NULL) { + MD5Update(&ctx, (const unsigned char *) p, (unsigned) strlen(p)); + } + va_end(ap); + + MD5Final(hash, &ctx); + bin2str(buf, hash, sizeof(hash)); + return buf; +} + +// Check the user's password, return 1 if OK +static int check_password(const char *method, const char *ha1, const char *uri, + const char *nonce, const char *nc, const char *cnonce, + const char *qop, const char *response) { + char ha2[32 + 1], expected_response[32 + 1]; + + // Some of the parameters may be NULL + if (method == NULL || nonce == NULL || nc == NULL || cnonce == NULL || + qop == NULL || response == NULL) { + return 0; + } + + // NOTE(lsm): due to a bug in MSIE, we do not compare the URI + // TODO(lsm): check for authentication timeout + if (// strcmp(dig->uri, c->ouri) != 0 || + strlen(response) != 32 + // || now - strtoul(dig->nonce, NULL, 10) > 3600 + ) { + return 0; + } + + mg_md5(ha2, method, ":", uri, NULL); + mg_md5(expected_response, ha1, ":", nonce, ":", nc, + ":", cnonce, ":", qop, ":", ha2, NULL); + + return mg_strcasecmp(response, expected_response) == 0; +} + +// Use the global passwords file, if specified by auth_gpass option, +// or search for .htpasswd in the requested directory. +static void open_auth_file(struct mg_connection *conn, const char *path, + struct file *filep) { + char name[PATH_MAX]; + const char *p, *e, *gpass = conn->ctx->config[GLOBAL_PASSWORDS_FILE]; + struct file file = STRUCT_FILE_INITIALIZER; + + if (gpass != NULL) { + // Use global passwords file + if (!mg_fopen(conn, gpass, "r", filep)) { + cry(conn, "fopen(%s): %s", gpass, strerror(ERRNO)); + } + // Important: using local struct file to test path for is_directory flag. + // If filep is used, mg_stat() makes it appear as if auth file was opened. + } else if (mg_stat(conn, path, &file) && file.is_directory) { + mg_snprintf(conn, name, sizeof(name), "%s%c%s", + path, '/', PASSWORDS_FILE_NAME); + mg_fopen(conn, name, "r", filep); + } else { + // Try to find .htpasswd in requested directory. + for (p = path, e = p + strlen(p) - 1; e > p; e--) + if (e[0] == '/') + break; + mg_snprintf(conn, name, sizeof(name), "%.*s%c%s", + (int) (e - p), p, '/', PASSWORDS_FILE_NAME); + mg_fopen(conn, name, "r", filep); + } +} + +// Parsed Authorization header +struct ah { + char *user, *uri, *cnonce, *response, *qop, *nc, *nonce; +}; + +// Return 1 on success. Always initializes the ah structure. +static int parse_auth_header(struct mg_connection *conn, char *buf, + size_t buf_size, struct ah *ah) { + char *name, *value, *s; + const char *auth_header; + + (void) memset(ah, 0, sizeof(*ah)); + if ((auth_header = mg_get_header(conn, "Authorization")) == NULL || + mg_strncasecmp(auth_header, "Digest ", 7) != 0) { + return 0; + } + + // Make modifiable copy of the auth header + (void) mg_strlcpy(buf, auth_header + 7, buf_size); + s = buf; + + // Parse authorization header + for (;;) { + // Gobble initial spaces + while (isspace(* (unsigned char *) s)) { + s++; + } + name = skip_quoted(&s, "=", " ", 0); + // Value is either quote-delimited, or ends at first comma or space. + if (s[0] == '\"') { + s++; + value = skip_quoted(&s, "\"", " ", '\\'); + if (s[0] == ',') { + s++; + } + } else { + value = skip_quoted(&s, ", ", " ", 0); // IE uses commas, FF uses spaces + } + if (*name == '\0') { + break; + } + + if (!strcmp(name, "username")) { + ah->user = value; + } else if (!strcmp(name, "cnonce")) { + ah->cnonce = value; + } else if (!strcmp(name, "response")) { + ah->response = value; + } else if (!strcmp(name, "uri")) { + ah->uri = value; + } else if (!strcmp(name, "qop")) { + ah->qop = value; + } else if (!strcmp(name, "nc")) { + ah->nc = value; + } else if (!strcmp(name, "nonce")) { + ah->nonce = value; + } + } + + // CGI needs it as REMOTE_USER + if (ah->user != NULL) { + conn->request_info.remote_user = mg_strdup(ah->user); + } else { + return 0; + } + + return 1; +} + +static char *mg_fgets(char *buf, size_t size, struct file *filep, char **p) { + char *eof; + size_t len; + char *memend; + + if (filep->membuf != NULL && *p != NULL) { + memend = (char *) &filep->membuf[filep->size]; + eof = (char *) memchr(*p, '\n', memend - *p); // Search for \n from p till the end of stream + if (eof != NULL) { + eof += 1; // Include \n + } else { + eof = memend; // Copy remaining data + } + len = (size_t) (eof - *p) > size - 1 ? size - 1 : (size_t) (eof - *p); + memcpy(buf, *p, len); + buf[len] = '\0'; + *p += len; + return len ? eof : NULL; + } else if (filep->fp != NULL) { + return fgets(buf, size, filep->fp); + } else { + return NULL; + } +} + +// Authorize against the opened passwords file. Return 1 if authorized. +static int authorize(struct mg_connection *conn, struct file *filep) { + struct ah ah; + char line[256], f_user[256], ha1[256], f_domain[256], buf[MG_BUF_LEN], *p; + + if (!parse_auth_header(conn, buf, sizeof(buf), &ah)) { + return 0; + } + + // Loop over passwords file + p = (char *) filep->membuf; + while (mg_fgets(line, sizeof(line), filep, &p) != NULL) { + if (sscanf(line, "%[^:]:%[^:]:%s", f_user, f_domain, ha1) != 3) { + continue; + } + + if (!strcmp(ah.user, f_user) && + !strcmp(conn->ctx->config[AUTHENTICATION_DOMAIN], f_domain)) + return check_password(conn->request_info.request_method, ha1, ah.uri, + ah.nonce, ah.nc, ah.cnonce, ah.qop, ah.response); + } + + return 0; +} + +// Return 1 if request is authorised, 0 otherwise. +static int check_authorization(struct mg_connection *conn, const char *path) { + char fname[PATH_MAX]; + struct vec uri_vec, filename_vec; + const char *list; + struct file file = STRUCT_FILE_INITIALIZER; + int authorized = 1; + + list = conn->ctx->config[PROTECT_URI]; + while ((list = next_option(list, &uri_vec, &filename_vec)) != NULL) { + if (!memcmp(conn->request_info.uri, uri_vec.ptr, uri_vec.len)) { + mg_snprintf(conn, fname, sizeof(fname), "%.*s", + (int) filename_vec.len, filename_vec.ptr); + if (!mg_fopen(conn, fname, "r", &file)) { + cry(conn, "%s: cannot open %s: %s", __func__, fname, strerror(errno)); + } + break; + } + } + + if (!is_file_opened(&file)) { + open_auth_file(conn, path, &file); + } + + if (is_file_opened(&file)) { + authorized = authorize(conn, &file); + mg_fclose(&file); + } + + return authorized; +} + +static void send_authorization_request(struct mg_connection *conn) { + conn->status_code = 401; + mg_printf(conn, + "HTTP/1.1 401 Unauthorized\r\n" + "Content-Length: 0\r\n" + "WWW-Authenticate: Digest qop=\"auth\", " + "realm=\"%s\", nonce=\"%lu\"\r\n\r\n", + conn->ctx->config[AUTHENTICATION_DOMAIN], + (unsigned long) time(NULL)); +} + +static int is_authorized_for_put(struct mg_connection *conn) { + struct file file = STRUCT_FILE_INITIALIZER; + const char *passfile = conn->ctx->config[PUT_DELETE_PASSWORDS_FILE]; + int ret = 0; + + if (passfile != NULL && mg_fopen(conn, passfile, "r", &file)) { + ret = authorize(conn, &file); + mg_fclose(&file); + } + + return ret; +} + +int mg_modify_passwords_file(const char *fname, const char *domain, + const char *user, const char *pass) { + int found; + char line[512], u[512], d[512], ha1[33], tmp[PATH_MAX]; + FILE *fp, *fp2; + + found = 0; + fp = fp2 = NULL; + + // Regard empty password as no password - remove user record. + if (pass != NULL && pass[0] == '\0') { + pass = NULL; + } + + (void) snprintf(tmp, sizeof(tmp), "%s.tmp", fname); + + // Create the file if does not exist + if ((fp = fopen(fname, "a+")) != NULL) { + (void) fclose(fp); + } + + // Open the given file and temporary file + if ((fp = fopen(fname, "r")) == NULL) { + return 0; + } else if ((fp2 = fopen(tmp, "w+")) == NULL) { + fclose(fp); + return 0; + } + + // Copy the stuff to temporary file + while (fgets(line, sizeof(line), fp) != NULL) { + if (sscanf(line, "%[^:]:%[^:]:%*s", u, d) != 2) { + continue; + } + + if (!strcmp(u, user) && !strcmp(d, domain)) { + found++; + if (pass != NULL) { + mg_md5(ha1, user, ":", domain, ":", pass, NULL); + fprintf(fp2, "%s:%s:%s\n", user, domain, ha1); + } + } else { + fprintf(fp2, "%s", line); + } + } + + // If new user, just add it + if (!found && pass != NULL) { + mg_md5(ha1, user, ":", domain, ":", pass, NULL); + fprintf(fp2, "%s:%s:%s\n", user, domain, ha1); + } + + // Close files + fclose(fp); + fclose(fp2); + + // Put the temp file in place of real file + remove(fname); + rename(tmp, fname); + + return 1; +} + +static SOCKET conn2(const char *host, int port, int use_ssl, + char *ebuf, size_t ebuf_len) { + struct sockaddr_in sin; + struct hostent *he; + SOCKET sock = INVALID_SOCKET; + + if (host == NULL) { + snprintf(ebuf, ebuf_len, "%s", "NULL host"); + } else if (use_ssl && SSLv23_client_method == NULL) { + snprintf(ebuf, ebuf_len, "%s", "SSL is not initialized"); + // TODO(lsm): use something threadsafe instead of gethostbyname() + } else if ((he = gethostbyname(host)) == NULL) { + snprintf(ebuf, ebuf_len, "gethostbyname(%s): %s", host, strerror(ERRNO)); + } else if ((sock = socket(PF_INET, SOCK_STREAM, 0)) == INVALID_SOCKET) { + snprintf(ebuf, ebuf_len, "socket(): %s", strerror(ERRNO)); + } else { + set_close_on_exec(sock); + sin.sin_family = AF_INET; + sin.sin_port = htons((uint16_t) port); + sin.sin_addr = * (struct in_addr *) he->h_addr_list[0]; + if (connect(sock, (struct sockaddr *) &sin, sizeof(sin)) != 0) { + snprintf(ebuf, ebuf_len, "connect(%s:%d): %s", + host, port, strerror(ERRNO)); + closesocket(sock); + sock = INVALID_SOCKET; + } + } + return sock; +} + + + +static void mg_url_encode(const char *src, char *dst, size_t dst_len) { + static const char *dont_escape = "._-$,;~()"; + static const char *hex = "0123456789abcdef"; + const char *end = dst + dst_len - 1; + + for (; *src != '\0' && dst < end; src++, dst++) { + if (isalnum(*(const unsigned char *) src) || + strchr(dont_escape, * (const unsigned char *) src) != NULL) { + *dst = *src; + } else if (dst + 2 < end) { + dst[0] = '%'; + dst[1] = hex[(* (const unsigned char *) src) >> 4]; + dst[2] = hex[(* (const unsigned char *) src) & 0xf]; + dst += 2; + } + } + + *dst = '\0'; +} + +static void print_dir_entry(struct de *de) { + char size[64], mod[64], href[PATH_MAX]; + + if (de->file.is_directory) { + mg_snprintf(de->conn, size, sizeof(size), "%s", "[DIRECTORY]"); + } else { + // We use (signed) cast below because MSVC 6 compiler cannot + // convert unsigned __int64 to double. Sigh. + if (de->file.size < 1024) { + mg_snprintf(de->conn, size, sizeof(size), "%d", (int) de->file.size); + } else if (de->file.size < 0x100000) { + mg_snprintf(de->conn, size, sizeof(size), + "%.1fk", (double) de->file.size / 1024.0); + } else if (de->file.size < 0x40000000) { + mg_snprintf(de->conn, size, sizeof(size), + "%.1fM", (double) de->file.size / 1048576); + } else { + mg_snprintf(de->conn, size, sizeof(size), + "%.1fG", (double) de->file.size / 1073741824); + } + } + strftime(mod, sizeof(mod), "%d-%b-%Y %H:%M", + localtime(&de->file.modification_time)); + mg_url_encode(de->file_name, href, sizeof(href)); + de->conn->num_bytes_sent += mg_printf(de->conn, + "%s%s" + " %s  %s\n", + de->conn->request_info.uri, href, de->file.is_directory ? "/" : "", + de->file_name, de->file.is_directory ? "/" : "", mod, size); +} + +// This function is called from send_directory() and used for +// sorting directory entries by size, or name, or modification time. +// On windows, __cdecl specification is needed in case if project is built +// with __stdcall convention. qsort always requires __cdels callback. +static int WINCDECL compare_dir_entries(const void *p1, const void *p2) { + const struct de *a = (const struct de *) p1, *b = (const struct de *) p2; + const char *query_string = a->conn->request_info.query_string; + int cmp_result = 0; + + if (query_string == NULL) { + query_string = "na"; + } + + if (a->file.is_directory && !b->file.is_directory) { + return -1; // Always put directories on top + } else if (!a->file.is_directory && b->file.is_directory) { + return 1; // Always put directories on top + } else if (*query_string == 'n') { + cmp_result = strcmp(a->file_name, b->file_name); + } else if (*query_string == 's') { + cmp_result = a->file.size == b->file.size ? 0 : + a->file.size > b->file.size ? 1 : -1; + } else if (*query_string == 'd') { + cmp_result = a->file.modification_time == b->file.modification_time ? 0 : + a->file.modification_time > b->file.modification_time ? 1 : -1; + } + + return query_string[1] == 'd' ? -cmp_result : cmp_result; +} + +static int must_hide_file(struct mg_connection *conn, const char *path) { + const char *pw_pattern = "**" PASSWORDS_FILE_NAME "$"; + const char *pattern = conn->ctx->config[HIDE_FILES]; + return match_prefix(pw_pattern, strlen(pw_pattern), path) > 0 || + (pattern != NULL && match_prefix(pattern, strlen(pattern), path) > 0); +} + +static int scan_directory(struct mg_connection *conn, const char *dir, + void *data, void (*cb)(struct de *, void *)) { + char path[PATH_MAX]; + struct dirent *dp; + DIR *dirp; + struct de de; + + if ((dirp = opendir(dir)) == NULL) { + return 0; + } else { + de.conn = conn; + + while ((dp = readdir(dirp)) != NULL) { + // Do not show current dir and hidden files + if (!strcmp(dp->d_name, ".") || + !strcmp(dp->d_name, "..") || + must_hide_file(conn, dp->d_name)) { + continue; + } + + mg_snprintf(conn, path, sizeof(path), "%s%c%s", dir, '/', dp->d_name); + + // If we don't memset stat structure to zero, mtime will have + // garbage and strftime() will segfault later on in + // print_dir_entry(). memset is required only if mg_stat() + // fails. For more details, see + // http://code.google.com/p/mongoose/issues/detail?id=79 + memset(&de.file, 0, sizeof(de.file)); + mg_stat(conn, path, &de.file); + + de.file_name = dp->d_name; + cb(&de, data); + } + (void) closedir(dirp); + } + return 1; +} + +static int remove_directory(struct mg_connection *conn, const char *dir) { + char path[PATH_MAX]; + struct dirent *dp; + DIR *dirp; + struct de de; + + if ((dirp = opendir(dir)) == NULL) { + return 0; + } else { + de.conn = conn; + + while ((dp = readdir(dirp)) != NULL) { + // Do not show current dir (but show hidden files as they will also be removed) + if (!strcmp(dp->d_name, ".") || + !strcmp(dp->d_name, "..")) { + continue; + } + + mg_snprintf(conn, path, sizeof(path), "%s%c%s", dir, '/', dp->d_name); + + // If we don't memset stat structure to zero, mtime will have + // garbage and strftime() will segfault later on in + // print_dir_entry(). memset is required only if mg_stat() + // fails. For more details, see + // http://code.google.com/p/mongoose/issues/detail?id=79 + memset(&de.file, 0, sizeof(de.file)); + mg_stat(conn, path, &de.file); + if(de.file.modification_time) { + if(de.file.is_directory) { + remove_directory(conn, path); + } else { + mg_remove(path); + } + } + + } + (void) closedir(dirp); + + rmdir(dir); + } + + return 1; +} + +struct dir_scan_data { + struct de *entries; + int num_entries; + int arr_size; +}; + +// Behaves like realloc(), but frees original pointer on failure +static void *realloc2(void *ptr, size_t size) { + void *new_ptr = realloc(ptr, size); + if (new_ptr == NULL) { + free(ptr); + } + return new_ptr; +} + +static void dir_scan_callback(struct de *de, void *data) { + struct dir_scan_data *dsd = (struct dir_scan_data *) data; + + if (dsd->entries == NULL || dsd->num_entries >= dsd->arr_size) { + dsd->arr_size *= 2; + dsd->entries = (struct de *) realloc2(dsd->entries, dsd->arr_size * + sizeof(dsd->entries[0])); + } + if (dsd->entries == NULL) { + // TODO(lsm): propagate an error to the caller + dsd->num_entries = 0; + } else { + dsd->entries[dsd->num_entries].file_name = mg_strdup(de->file_name); + dsd->entries[dsd->num_entries].file = de->file; + dsd->entries[dsd->num_entries].conn = de->conn; + dsd->num_entries++; + } +} + +static void handle_directory_request(struct mg_connection *conn, + const char *dir) { + int i, sort_direction; + struct dir_scan_data data = { NULL, 0, 128 }; + + if (!scan_directory(conn, dir, &data, dir_scan_callback)) { + send_http_error(conn, 500, "Cannot open directory", + "Error: opendir(%s): %s", dir, strerror(ERRNO)); + return; + } + + sort_direction = conn->request_info.query_string != NULL && + conn->request_info.query_string[1] == 'd' ? 'a' : 'd'; + + conn->must_close = 1; + mg_printf(conn, "%s", + "HTTP/1.1 200 OK\r\n" + "Connection: close\r\n" + "Content-Type: text/html; charset=utf-8\r\n\r\n"); + + conn->num_bytes_sent += mg_printf(conn, + "Index of %s" + "" + "

Index of %s

"
+      ""
+      ""
+      ""
+      "",
+      conn->request_info.uri, conn->request_info.uri,
+      sort_direction, sort_direction, sort_direction);
+
+  // Print first entry - link to a parent directory
+  conn->num_bytes_sent += mg_printf(conn,
+      ""
+      "\n",
+      conn->request_info.uri, "..", "Parent directory", "-", "-");
+
+  // Sort and print directory entries
+  qsort(data.entries, (size_t) data.num_entries, sizeof(data.entries[0]),
+        compare_dir_entries);
+  for (i = 0; i < data.num_entries; i++) {
+    print_dir_entry(&data.entries[i]);
+    free(data.entries[i].file_name);
+  }
+  free(data.entries);
+
+  conn->num_bytes_sent += mg_printf(conn, "%s", "
NameModifiedSize
%s %s  %s
");
+  conn->status_code = 200;
+}
+
+// Send len bytes from the opened file to the client.
+static void send_file_data(struct mg_connection *conn, struct file *filep,
+                           int64_t offset, int64_t len) {
+  char buf[MG_BUF_LEN];
+  int to_read, num_read, num_written;
+
+  // Sanity check the offset
+  offset = offset < 0 ? 0 : offset > filep->size ? filep->size : offset;
+
+  if (len > 0 && filep->membuf != NULL && filep->size > 0) {
+    if (len > filep->size - offset) {
+      len = filep->size - offset;
+    }
+    mg_write(conn, filep->membuf + offset, (size_t) len);
+  } else if (len > 0 && filep->fp != NULL) {
+    fseeko(filep->fp, offset, SEEK_SET);
+    while (len > 0) {
+      // Calculate how much to read from the file in the buffer
+      to_read = sizeof(buf);
+      if ((int64_t) to_read > len) {
+        to_read = (int) len;
+      }
+
+      // Read from file, exit the loop on error
+      if ((num_read = fread(buf, 1, (size_t) to_read, filep->fp)) <= 0) {
+        break;
+      }
+
+      // Send read bytes to the client, exit the loop on error
+      if ((num_written = mg_write(conn, buf, (size_t) num_read)) != num_read) {
+        break;
+      }
+
+      // Both read and were successful, adjust counters
+      conn->num_bytes_sent += num_written;
+      len -= num_written;
+    }
+  }
+}
+
+static int parse_range_header(const char *header, int64_t *a, int64_t *b) {
+  return sscanf(header, "bytes=%" INT64_FMT "-%" INT64_FMT, a, b);
+}
+
+static void gmt_time_string(char *buf, size_t buf_len, time_t *t) {
+  strftime(buf, buf_len, "%a, %d %b %Y %H:%M:%S GMT", gmtime(t));
+}
+
+static void construct_etag(char *buf, size_t buf_len,
+                           const struct file *filep) {
+  snprintf(buf, buf_len, "\"%lx.%" INT64_FMT "\"",
+           (unsigned long) filep->modification_time, filep->size);
+}
+
+static void fclose_on_exec(struct file *filep) {
+  if (filep != NULL && filep->fp != NULL) {
+#ifndef _WIN32
+    fcntl(fileno(filep->fp), F_SETFD, FD_CLOEXEC);
+#endif
+  }
+}
+
+static void handle_file_request(struct mg_connection *conn, const char *path,
+                                struct file *filep) {
+  char date[64], lm[64], etag[64], range[64];
+  const char *msg = "OK", *hdr;
+  time_t curtime = time(NULL);
+  int64_t cl, r1, r2;
+  struct vec mime_vec;
+  int n;
+  char gz_path[PATH_MAX];
+  char const* encoding = "";
+
+  get_mime_type(conn->ctx, path, &mime_vec);
+  cl = filep->size;
+  conn->status_code = 200;
+  range[0] = '\0';
+
+  // if this file is in fact a pre-gzipped file, rewrite its filename
+  // it's important to rewrite the filename after resolving
+  // the mime type from it, to preserve the actual file's type
+  if (filep->gzipped) {
+    snprintf(gz_path, sizeof(gz_path), "%s.gz", path);
+    path = gz_path;
+    encoding = "Content-Encoding: gzip\r\n";
+  }
+
+  if (!mg_fopen(conn, path, "rb", filep)) {
+    send_http_error(conn, 500, http_500_error,
+                    "fopen(%s): %s", path, strerror(ERRNO));
+    return;
+  }
+
+  fclose_on_exec(filep);
+
+  // If Range: header specified, act accordingly
+  r1 = r2 = 0;
+  hdr = mg_get_header(conn, "Range");
+  if (hdr != NULL && (n = parse_range_header(hdr, &r1, &r2)) > 0 &&
+      r1 >= 0 && r2 >= 0) {
+    // actually, range requests don't play well with a pre-gzipped
+    // file (since the range is specified in the uncmpressed space)
+    if (filep->gzipped) {
+      send_http_error(conn, 501, "Not Implemented", "range requests in gzipped files are not supported");
+      return;
+    }
+    conn->status_code = 206;
+    cl = n == 2 ? (r2 > cl ? cl : r2) - r1 + 1: cl - r1;
+    mg_snprintf(conn, range, sizeof(range),
+                "Content-Range: bytes "
+                "%" INT64_FMT "-%"
+                INT64_FMT "/%" INT64_FMT "\r\n",
+                r1, r1 + cl - 1, filep->size);
+    msg = "Partial Content";
+  }
+
+  // Prepare Etag, Date, Last-Modified headers. Must be in UTC, according to
+  // http://www.w3.org/Protocols/rfc2616/rfc2616-sec3.html#sec3.3
+  gmt_time_string(date, sizeof(date), &curtime);
+  gmt_time_string(lm, sizeof(lm), &filep->modification_time);
+  construct_etag(etag, sizeof(etag), filep);
+
+  (void) mg_printf(conn,
+      "HTTP/1.1 %d %s\r\n"
+      "Date: %s\r\n"
+      "Last-Modified: %s\r\n"
+      "Etag: %s\r\n"
+      "Content-Type: %.*s\r\n"
+      "Content-Length: %" INT64_FMT "\r\n"
+      "Connection: %s\r\n"
+      "Accept-Ranges: bytes\r\n"
+      "%s%s\r\n",
+      conn->status_code, msg, date, lm, etag, (int) mime_vec.len,
+      mime_vec.ptr, cl, suggest_connection_header(conn), range, encoding);
+
+  if (strcmp(conn->request_info.request_method, "HEAD") != 0) {
+    send_file_data(conn, filep, r1, cl);
+  }
+  mg_fclose(filep);
+}
+
+void mg_send_file(struct mg_connection *conn, const char *path) {
+  struct file file = STRUCT_FILE_INITIALIZER;
+  if (mg_stat(conn, path, &file)) {
+    handle_file_request(conn, path, &file);
+  } else {
+    send_http_error(conn, 404, "Not Found", "%s", "File not found");
+  }
+}
+
+
+// Parse HTTP headers from the given buffer, advance buffer to the point
+// where parsing stopped.
+static void parse_http_headers(char **buf, struct mg_request_info *ri) {
+  int i;
+
+  for (i = 0; i < (int) ARRAY_SIZE(ri->http_headers); i++) {
+    ri->http_headers[i].name = skip_quoted(buf, ":", " ", 0);
+    ri->http_headers[i].value = skip(buf, "\r\n");
+    if (ri->http_headers[i].name[0] == '\0')
+      break;
+    ri->num_headers = i + 1;
+  }
+}
+
+static int is_valid_http_method(const char *method) {
+  return !strcmp(method, "GET") || !strcmp(method, "POST") ||
+    !strcmp(method, "HEAD") || !strcmp(method, "CONNECT") ||
+    !strcmp(method, "PUT") || !strcmp(method, "DELETE") ||
+    !strcmp(method, "OPTIONS") || !strcmp(method, "PROPFIND")
+    || !strcmp(method, "MKCOL")
+          ;
+}
+
+// Parse HTTP request, fill in mg_request_info structure.
+// This function modifies the buffer by NUL-terminating
+// HTTP request components, header names and header values.
+static int parse_http_message(char *buf, int len, struct mg_request_info *ri) {
+  int is_request, request_length = get_request_len(buf, len);
+  if (request_length > 0) {
+    // Reset attributes. DO NOT TOUCH is_ssl, remote_ip, remote_port
+    ri->remote_user = ri->request_method = ri->uri = ri->http_version = NULL;
+    ri->num_headers = 0;
+
+    buf[request_length - 1] = '\0';
+
+    // RFC says that all initial whitespaces should be ingored
+    while (*buf != '\0' && isspace(* (unsigned char *) buf)) {
+      buf++;
+    }
+    ri->request_method = skip(&buf, " ");
+    ri->uri = skip(&buf, " ");
+    ri->http_version = skip(&buf, "\r\n");
+
+    // HTTP message could be either HTTP request or HTTP response, e.g.
+    // "GET / HTTP/1.0 ...." or  "HTTP/1.0 200 OK ..."
+    is_request = is_valid_http_method(ri->request_method);
+    if ((is_request && memcmp(ri->http_version, "HTTP/", 5) != 0) ||
+        (!is_request && memcmp(ri->request_method, "HTTP/", 5) != 0)) {
+      request_length = -1;
+    } else {
+      if (is_request) {
+        ri->http_version += 5;
+      }
+      parse_http_headers(&buf, ri);
+    }
+  }
+  return request_length;
+}
+
+// Keep reading the input (either opened file descriptor fd, or socket sock,
+// or SSL descriptor ssl) into buffer buf, until \r\n\r\n appears in the
+// buffer (which marks the end of HTTP request). Buffer buf may already
+// have some data. The length of the data is stored in nread.
+// Upon every read operation, increase nread by the number of bytes read.
+static int read_request(FILE *fp, struct mg_connection *conn,
+                        char *buf, int bufsiz, int *nread) {
+  int request_len, n = 0;
+
+  request_len = get_request_len(buf, *nread);
+  while (conn->ctx->stop_flag == 0 &&
+         *nread < bufsiz && request_len == 0 &&
+         (n = pull(fp, conn, buf + *nread, bufsiz - *nread)) > 0) {
+    *nread += n;
+    assert(*nread <= bufsiz);
+    request_len = get_request_len(buf, *nread);
+  }
+
+  return request_len <= 0 && n <= 0 ? -1 : request_len;
+}
+
+// For given directory path, substitute it to valid index file.
+// Return 0 if index file has been found, -1 if not found.
+// If the file is found, it's stats is returned in stp.
+static int substitute_index_file(struct mg_connection *conn, char *path,
+                                 size_t path_len, struct file *filep) {
+  const char *list = conn->ctx->config[INDEX_FILES];
+  struct file file = STRUCT_FILE_INITIALIZER;
+  struct vec filename_vec;
+  size_t n = strlen(path);
+  int found = 0;
+
+  // The 'path' given to us points to the directory. Remove all trailing
+  // directory separator characters from the end of the path, and
+  // then append single directory separator character.
+  while (n > 0 && path[n - 1] == '/') {
+    n--;
+  }
+  path[n] = '/';
+
+  // Traverse index files list. For each entry, append it to the given
+  // path and see if the file exists. If it exists, break the loop
+  while ((list = next_option(list, &filename_vec, NULL)) != NULL) {
+
+    // Ignore too long entries that may overflow path buffer
+    if (filename_vec.len > path_len - (n + 2))
+      continue;
+
+    // Prepare full path to the index file
+    mg_strlcpy(path + n + 1, filename_vec.ptr, filename_vec.len + 1);
+
+    // Does it exist?
+    if (mg_stat(conn, path, &file)) {
+      // Yes it does, break the loop
+      *filep = file;
+      found = 1;
+      break;
+    }
+  }
+
+  // If no index file exists, restore directory path
+  if (!found) {
+    path[n] = '\0';
+  }
+
+  return found;
+}
+
+// Return True if we should reply 304 Not Modified.
+static int is_not_modified(const struct mg_connection *conn,
+                           const struct file *filep) {
+  char etag[64];
+  const char *ims = mg_get_header(conn, "If-Modified-Since");
+  const char *inm = mg_get_header(conn, "If-None-Match");
+  construct_etag(etag, sizeof(etag), filep);
+  return (inm != NULL && !mg_strcasecmp(etag, inm)) ||
+    (ims != NULL && filep->modification_time <= parse_date_string(ims));
+}
+
+static int forward_body_data(struct mg_connection *conn, FILE *fp,
+                             SOCKET sock, SSL *ssl) {
+  const char *expect, *body;
+  char buf[MG_BUF_LEN];
+  int to_read, nread, buffered_len, success = 0;
+
+  expect = mg_get_header(conn, "Expect");
+  assert(fp != NULL);
+
+  if (conn->content_len == -1) {
+    send_http_error(conn, 411, "Length Required", "%s", "");
+  } else if (expect != NULL && mg_strcasecmp(expect, "100-continue")) {
+    send_http_error(conn, 417, "Expectation Failed", "%s", "");
+  } else {
+    if (expect != NULL) {
+      (void) mg_printf(conn, "%s", "HTTP/1.1 100 Continue\r\n\r\n");
+    }
+
+    body = conn->buf + conn->request_len + conn->consumed_content;
+    buffered_len = &conn->buf[conn->data_len] - body;
+    assert(buffered_len >= 0);
+    assert(conn->consumed_content == 0);
+
+    if (buffered_len > 0) {
+      if ((int64_t) buffered_len > conn->content_len) {
+        buffered_len = (int) conn->content_len;
+      }
+      push(fp, sock, ssl, body, (int64_t) buffered_len);
+      conn->consumed_content += buffered_len;
+    }
+
+    nread = 0;
+    while (conn->consumed_content < conn->content_len) {
+      to_read = sizeof(buf);
+      if ((int64_t) to_read > conn->content_len - conn->consumed_content) {
+        to_read = (int) (conn->content_len - conn->consumed_content);
+      }
+      nread = pull(NULL, conn, buf, to_read);
+      if (nread <= 0 || push(fp, sock, ssl, buf, nread) != nread) {
+        break;
+      }
+      conn->consumed_content += nread;
+    }
+
+    if (conn->consumed_content == conn->content_len) {
+      success = nread >= 0;
+    }
+
+    // Each error code path in this function must send an error
+    if (!success) {
+      send_http_error(conn, 577, http_500_error, "%s", "");
+    }
+  }
+
+  return success;
+}
+
+#if !defined(NO_CGI)
+// This structure helps to create an environment for the spawned CGI program.
+// Environment is an array of "VARIABLE=VALUE\0" ASCIIZ strings,
+// last element must be NULL.
+// However, on Windows there is a requirement that all these VARIABLE=VALUE\0
+// strings must reside in a contiguous buffer. The end of the buffer is
+// marked by two '\0' characters.
+// We satisfy both worlds: we create an envp array (which is vars), all
+// entries are actually pointers inside buf.
+struct cgi_env_block {
+  struct mg_connection *conn;
+  char buf[CGI_ENVIRONMENT_SIZE]; // Environment buffer
+  int len; // Space taken
+  char *vars[MAX_CGI_ENVIR_VARS]; // char **envp
+  int nvars; // Number of variables
+};
+
+static char *addenv(struct cgi_env_block *block,
+                    PRINTF_FORMAT_STRING(const char *fmt), ...)
+  PRINTF_ARGS(2, 3);
+
+// Append VARIABLE=VALUE\0 string to the buffer, and add a respective
+// pointer into the vars array.
+static char *addenv(struct cgi_env_block *block, const char *fmt, ...) {
+  int n, space;
+  char *added;
+  va_list ap;
+
+  // Calculate how much space is left in the buffer
+  space = sizeof(block->buf) - block->len - 2;
+  assert(space >= 0);
+
+  // Make a pointer to the free space int the buffer
+  added = block->buf + block->len;
+
+  // Copy VARIABLE=VALUE\0 string into the free space
+  va_start(ap, fmt);
+  n = mg_vsnprintf(block->conn, added, (size_t) space, fmt, ap);
+  va_end(ap);
+
+  // Make sure we do not overflow buffer and the envp array
+  if (n > 0 && n + 1 < space &&
+      block->nvars < (int) ARRAY_SIZE(block->vars) - 2) {
+    // Append a pointer to the added string into the envp array
+    block->vars[block->nvars++] = added;
+    // Bump up used length counter. Include \0 terminator
+    block->len += n + 1;
+  } else {
+    cry(block->conn, "%s: CGI env buffer truncated for [%s]", __func__, fmt);
+  }
+
+  return added;
+}
+
+static void prepare_cgi_environment(struct mg_connection *conn,
+                                    const char *prog,
+                                    struct cgi_env_block *blk) {
+  const char *s, *slash;
+  struct vec var_vec;
+  char *p, src_addr[IP_ADDR_STR_LEN];
+  int  i;
+
+  blk->len = blk->nvars = 0;
+  blk->conn = conn;
+  sockaddr_to_string(src_addr, sizeof(src_addr), &conn->client.rsa);
+
+  addenv(blk, "SERVER_NAME=%s", conn->ctx->config[AUTHENTICATION_DOMAIN]);
+  addenv(blk, "SERVER_ROOT=%s", conn->ctx->config[DOCUMENT_ROOT]);
+  addenv(blk, "DOCUMENT_ROOT=%s", conn->ctx->config[DOCUMENT_ROOT]);
+  addenv(blk, "SERVER_SOFTWARE=%s/%s", "Mongoose", mg_version());
+
+  // Prepare the environment block
+  addenv(blk, "%s", "GATEWAY_INTERFACE=CGI/1.1");
+  addenv(blk, "%s", "SERVER_PROTOCOL=HTTP/1.1");
+  addenv(blk, "%s", "REDIRECT_STATUS=200"); // For PHP
+
+  // TODO(lsm): fix this for IPv6 case
+  addenv(blk, "SERVER_PORT=%d", ntohs(conn->client.lsa.sin.sin_port));
+
+  addenv(blk, "REQUEST_METHOD=%s", conn->request_info.request_method);
+  addenv(blk, "REMOTE_ADDR=%s", src_addr);
+  addenv(blk, "REMOTE_PORT=%d", conn->request_info.remote_port);
+  addenv(blk, "REQUEST_URI=%s", conn->request_info.uri);
+
+  // SCRIPT_NAME
+  assert(conn->request_info.uri[0] == '/');
+  slash = strrchr(conn->request_info.uri, '/');
+  if ((s = strrchr(prog, '/')) == NULL)
+    s = prog;
+  addenv(blk, "SCRIPT_NAME=%.*s%s", (int) (slash - conn->request_info.uri),
+         conn->request_info.uri, s);
+
+  addenv(blk, "SCRIPT_FILENAME=%s", prog);
+  addenv(blk, "PATH_TRANSLATED=%s", prog);
+  addenv(blk, "HTTPS=%s", conn->ssl == NULL ? "off" : "on");
+
+  if ((s = mg_get_header(conn, "Content-Type")) != NULL)
+    addenv(blk, "CONTENT_TYPE=%s", s);
+
+  if (conn->request_info.query_string != NULL)
+    addenv(blk, "QUERY_STRING=%s", conn->request_info.query_string);
+
+  if ((s = mg_get_header(conn, "Content-Length")) != NULL)
+    addenv(blk, "CONTENT_LENGTH=%s", s);
+
+  if ((s = getenv("PATH")) != NULL)
+    addenv(blk, "PATH=%s", s);
+
+  if (conn->path_info != NULL) {
+    addenv(blk, "PATH_INFO=%s", conn->path_info);
+  }
+
+#if defined(_WIN32)
+  if ((s = getenv("COMSPEC")) != NULL) {
+    addenv(blk, "COMSPEC=%s", s);
+  }
+  if ((s = getenv("SYSTEMROOT")) != NULL) {
+    addenv(blk, "SYSTEMROOT=%s", s);
+  }
+  if ((s = getenv("SystemDrive")) != NULL) {
+    addenv(blk, "SystemDrive=%s", s);
+  }
+  if ((s = getenv("ProgramFiles")) != NULL) {
+    addenv(blk, "ProgramFiles=%s", s);
+  }
+  if ((s = getenv("ProgramFiles(x86)")) != NULL) {
+    addenv(blk, "ProgramFiles(x86)=%s", s);
+  }
+#else
+  if ((s = getenv("LD_LIBRARY_PATH")) != NULL)
+    addenv(blk, "LD_LIBRARY_PATH=%s", s);
+#endif // _WIN32
+
+  if ((s = getenv("PERLLIB")) != NULL)
+    addenv(blk, "PERLLIB=%s", s);
+
+  if (conn->request_info.remote_user != NULL) {
+    addenv(blk, "REMOTE_USER=%s", conn->request_info.remote_user);
+    addenv(blk, "%s", "AUTH_TYPE=Digest");
+  }
+
+  // Add all headers as HTTP_* variables
+  for (i = 0; i < conn->request_info.num_headers; i++) {
+    p = addenv(blk, "HTTP_%s=%s",
+        conn->request_info.http_headers[i].name,
+        conn->request_info.http_headers[i].value);
+
+    // Convert variable name into uppercase, and change - to _
+    for (; *p != '=' && *p != '\0'; p++) {
+      if (*p == '-')
+        *p = '_';
+      *p = (char) toupper(* (unsigned char *) p);
+    }
+  }
+
+  // Add user-specified variables
+  s = conn->ctx->config[CGI_ENVIRONMENT];
+  while ((s = next_option(s, &var_vec, NULL)) != NULL) {
+    addenv(blk, "%.*s", (int) var_vec.len, var_vec.ptr);
+  }
+
+  blk->vars[blk->nvars++] = NULL;
+  blk->buf[blk->len++] = '\0';
+
+  assert(blk->nvars < (int) ARRAY_SIZE(blk->vars));
+  assert(blk->len > 0);
+  assert(blk->len < (int) sizeof(blk->buf));
+}
+
+static void handle_cgi_request(struct mg_connection *conn, const char *prog) {
+  int headers_len, data_len, i, fdin[2], fdout[2];
+  const char *status, *status_text;
+  char buf[16384], *pbuf, dir[PATH_MAX], *p;
+  struct mg_request_info ri;
+  struct cgi_env_block blk;
+  FILE *in = NULL, *out = NULL;
+  struct file fout = STRUCT_FILE_INITIALIZER;
+  pid_t pid = (pid_t) -1;
+
+  prepare_cgi_environment(conn, prog, &blk);
+
+  // CGI must be executed in its own directory. 'dir' must point to the
+  // directory containing executable program, 'p' must point to the
+  // executable program name relative to 'dir'.
+  (void) mg_snprintf(conn, dir, sizeof(dir), "%s", prog);
+  if ((p = strrchr(dir, '/')) != NULL) {
+    *p++ = '\0';
+  } else {
+    dir[0] = '.', dir[1] = '\0';
+    p = (char *) prog;
+  }
+
+  if (pipe(fdin) != 0 || pipe(fdout) != 0) {
+    send_http_error(conn, 500, http_500_error,
+        "Cannot create CGI pipe: %s", strerror(ERRNO));
+    goto done;
+  }
+
+  pid = spawn_process(conn, p, blk.buf, blk.vars, fdin[0], fdout[1], dir);
+  if (pid == (pid_t) -1) {
+    send_http_error(conn, 500, http_500_error,
+        "Cannot spawn CGI process [%s]: %s", prog, strerror(ERRNO));
+    goto done;
+  }
+
+  // Make sure child closes all pipe descriptors. It must dup them to 0,1
+  set_close_on_exec(fdin[0]);
+  set_close_on_exec(fdin[1]);
+  set_close_on_exec(fdout[0]);
+  set_close_on_exec(fdout[1]);
+
+  // Parent closes only one side of the pipes.
+  // If we don't mark them as closed, close() attempt before
+  // return from this function throws an exception on Windows.
+  // Windows does not like when closed descriptor is closed again.
+  (void) close(fdin[0]);
+  (void) close(fdout[1]);
+  fdin[0] = fdout[1] = -1;
+
+
+  if ((in = fdopen(fdin[1], "wb")) == NULL ||
+      (out = fdopen(fdout[0], "rb")) == NULL) {
+    send_http_error(conn, 500, http_500_error,
+        "fopen: %s", strerror(ERRNO));
+    goto done;
+  }
+
+  setbuf(in, NULL);
+  setbuf(out, NULL);
+  fout.fp = out;
+
+  // Send POST data to the CGI process if needed
+  if (!strcmp(conn->request_info.request_method, "POST") &&
+      !forward_body_data(conn, in, INVALID_SOCKET, NULL)) {
+    goto done;
+  }
+
+  // Close so child gets an EOF.
+  fclose(in);
+  in = NULL;
+  fdin[1] = -1;
+
+  // Now read CGI reply into a buffer. We need to set correct
+  // status code, thus we need to see all HTTP headers first.
+  // Do not send anything back to client, until we buffer in all
+  // HTTP headers.
+  data_len = 0;
+  headers_len = read_request(out, conn, buf, sizeof(buf), &data_len);
+  if (headers_len <= 0) {
+    send_http_error(conn, 500, http_500_error,
+                    "CGI program sent malformed or too big (>%u bytes) "
+                    "HTTP headers: [%.*s]",
+                    (unsigned) sizeof(buf), data_len, buf);
+    goto done;
+  }
+  pbuf = buf;
+  buf[headers_len - 1] = '\0';
+  parse_http_headers(&pbuf, &ri);
+
+  // Make up and send the status line
+  status_text = "OK";
+  if ((status = get_header(&ri, "Status")) != NULL) {
+    conn->status_code = atoi(status);
+    status_text = status;
+    while (isdigit(* (unsigned char *) status_text) || *status_text == ' ') {
+      status_text++;
+    }
+  } else if (get_header(&ri, "Location") != NULL) {
+    conn->status_code = 302;
+  } else {
+    conn->status_code = 200;
+  }
+  if (get_header(&ri, "Connection") != NULL &&
+      !mg_strcasecmp(get_header(&ri, "Connection"), "keep-alive")) {
+    conn->must_close = 1;
+  }
+  (void) mg_printf(conn, "HTTP/1.1 %d %s\r\n", conn->status_code,
+                   status_text);
+
+  // Send headers
+  for (i = 0; i < ri.num_headers; i++) {
+    mg_printf(conn, "%s: %s\r\n",
+              ri.http_headers[i].name, ri.http_headers[i].value);
+  }
+  mg_write(conn, "\r\n", 2);
+
+  // Send chunk of data that may have been read after the headers
+  conn->num_bytes_sent += mg_write(conn, buf + headers_len,
+                                   (size_t)(data_len - headers_len));
+
+  // Read the rest of CGI output and send to the client
+  send_file_data(conn, &fout, 0, INT64_MAX);
+
+done:
+  if (pid != (pid_t) -1) {
+    kill(pid, SIGKILL);
+  }
+  if (fdin[0] != -1) {
+    close(fdin[0]);
+  }
+  if (fdout[1] != -1) {
+    close(fdout[1]);
+  }
+
+  if (in != NULL) {
+    fclose(in);
+  } else if (fdin[1] != -1) {
+    close(fdin[1]);
+  }
+
+  if (out != NULL) {
+    fclose(out);
+  } else if (fdout[0] != -1) {
+    close(fdout[0]);
+  }
+}
+#endif // !NO_CGI
+
+// For a given PUT path, create all intermediate subdirectories
+// for given path. Return 0 if the path itself is a directory,
+// or -1 on error, 1 if OK.
+static int put_dir(struct mg_connection *conn, const char *path) {
+  char buf[PATH_MAX];
+  const char *s, *p;
+  struct file file = STRUCT_FILE_INITIALIZER;
+  int len, res = 1;
+
+  for (s = p = path + 2; (p = strchr(s, '/')) != NULL; s = ++p) {
+    len = p - path;
+    if (len >= (int) sizeof(buf)) {
+      res = -1;
+      break;
+    }
+    memcpy(buf, path, len);
+    buf[len] = '\0';
+
+    // Try to create intermediate directory
+    DEBUG_TRACE(("mkdir(%s)", buf));
+    if (!mg_stat(conn, buf, &file) && mg_mkdir(buf, 0755) != 0) {
+      res = -1;
+      break;
+    }
+
+    // Is path itself a directory?
+    if (p[1] == '\0') {
+      res = 0;
+    }
+  }
+
+  return res;
+}
+
+static void mkcol(struct mg_connection *conn, const char *path) {
+  int rc, body_len;
+  struct de de;
+  memset(&de.file, 0, sizeof(de.file));
+  mg_stat(conn, path, &de.file);
+
+  if(de.file.modification_time) {
+      send_http_error(conn, 405, "Method Not Allowed",
+                      "mkcol(%s): %s", path, strerror(ERRNO));
+      return;
+  }
+
+  body_len = conn->data_len - conn->request_len;
+  if(body_len > 0) {
+      send_http_error(conn, 415, "Unsupported media type",
+                      "mkcol(%s): %s", path, strerror(ERRNO));
+      return;
+  }
+
+  rc = mg_mkdir(path, 0755);
+
+  if (rc == 0) {
+    conn->status_code = 201;
+    mg_printf(conn, "HTTP/1.1 %d Created\r\n\r\n", conn->status_code);
+  } else if (rc == -1) {
+      if(errno == EEXIST)
+        send_http_error(conn, 405, "Method Not Allowed",
+                      "mkcol(%s): %s", path, strerror(ERRNO));
+      else if(errno == EACCES)
+          send_http_error(conn, 403, "Forbidden",
+                        "mkcol(%s): %s", path, strerror(ERRNO));
+      else if(errno == ENOENT)
+          send_http_error(conn, 409, "Conflict",
+                        "mkcol(%s): %s", path, strerror(ERRNO));
+      else
+          send_http_error(conn, 500, http_500_error,
+                          "fopen(%s): %s", path, strerror(ERRNO));
+  }
+}
+
+static void put_file(struct mg_connection *conn, const char *path) {
+  struct file file = STRUCT_FILE_INITIALIZER;
+  const char *range;
+  int64_t r1, r2;
+  int rc;
+
+  conn->status_code = mg_stat(conn, path, &file) ? 200 : 201;
+
+  if ((rc = put_dir(conn, path)) == 0) {
+    mg_printf(conn, "HTTP/1.1 %d OK\r\n\r\n", conn->status_code);
+  } else if (rc == -1) {
+    send_http_error(conn, 500, http_500_error,
+                    "put_dir(%s): %s", path, strerror(ERRNO));
+  } else if (!mg_fopen(conn, path, "wb+", &file) || file.fp == NULL) {
+    mg_fclose(&file);
+    send_http_error(conn, 500, http_500_error,
+                    "fopen(%s): %s", path, strerror(ERRNO));
+  } else {
+    fclose_on_exec(&file);
+    range = mg_get_header(conn, "Content-Range");
+    r1 = r2 = 0;
+    if (range != NULL && parse_range_header(range, &r1, &r2) > 0) {
+      conn->status_code = 206;
+      fseeko(file.fp, r1, SEEK_SET);
+    }
+    if (!forward_body_data(conn, file.fp, INVALID_SOCKET, NULL)) {
+      conn->status_code = 500;
+    }
+    mg_printf(conn, "HTTP/1.1 %d OK\r\nContent-Length: 0\r\n\r\n",
+              conn->status_code);
+    mg_fclose(&file);
+  }
+}
+
+static void send_ssi_file(struct mg_connection *, const char *,
+                          struct file *, int);
+
+static void do_ssi_include(struct mg_connection *conn, const char *ssi,
+                           char *tag, int include_level) {
+  char file_name[MG_BUF_LEN], path[PATH_MAX], *p;
+  struct file file = STRUCT_FILE_INITIALIZER;
+
+  // sscanf() is safe here, since send_ssi_file() also uses buffer
+  // of size MG_BUF_LEN to get the tag. So strlen(tag) is always < MG_BUF_LEN.
+  if (sscanf(tag, " virtual=\"%[^\"]\"", file_name) == 1) {
+    // File name is relative to the webserver root
+    (void) mg_snprintf(conn, path, sizeof(path), "%s%c%s",
+        conn->ctx->config[DOCUMENT_ROOT], '/', file_name);
+  } else if (sscanf(tag, " abspath=\"%[^\"]\"", file_name) == 1) {
+    // File name is relative to the webserver working directory
+    // or it is absolute system path
+    (void) mg_snprintf(conn, path, sizeof(path), "%s", file_name);
+  } else if (sscanf(tag, " file=\"%[^\"]\"", file_name) == 1 ||
+             sscanf(tag, " \"%[^\"]\"", file_name) == 1) {
+    // File name is relative to the currect document
+    (void) mg_snprintf(conn, path, sizeof(path), "%s", ssi);
+    if ((p = strrchr(path, '/')) != NULL) {
+      p[1] = '\0';
+    }
+    (void) mg_snprintf(conn, path + strlen(path),
+        sizeof(path) - strlen(path), "%s", file_name);
+  } else {
+    cry(conn, "Bad SSI #include: [%s]", tag);
+    return;
+  }
+
+  if (!mg_fopen(conn, path, "rb", &file)) {
+    cry(conn, "Cannot open SSI #include: [%s]: fopen(%s): %s",
+        tag, path, strerror(ERRNO));
+  } else {
+    fclose_on_exec(&file);
+    if (match_prefix(conn->ctx->config[SSI_EXTENSIONS],
+                     strlen(conn->ctx->config[SSI_EXTENSIONS]), path) > 0) {
+      send_ssi_file(conn, path, &file, include_level + 1);
+    } else {
+      send_file_data(conn, &file, 0, INT64_MAX);
+    }
+    mg_fclose(&file);
+  }
+}
+
+#if !defined(NO_POPEN)
+static void do_ssi_exec(struct mg_connection *conn, char *tag) {
+  char cmd[MG_BUF_LEN];
+  struct file file = STRUCT_FILE_INITIALIZER;
+
+  if (sscanf(tag, " \"%[^\"]\"", cmd) != 1) {
+    cry(conn, "Bad SSI #exec: [%s]", tag);
+  } else if ((file.fp = popen(cmd, "r")) == NULL) {
+    cry(conn, "Cannot SSI #exec: [%s]: %s", cmd, strerror(ERRNO));
+  } else {
+    send_file_data(conn, &file, 0, INT64_MAX);
+    pclose(file.fp);
+  }
+}
+#endif // !NO_POPEN
+
+static int mg_fgetc(struct file *filep, int offset) {
+  if (filep->membuf != NULL && offset >=0 && offset < filep->size) {
+    return ((unsigned char *) filep->membuf)[offset];
+  } else if (filep->fp != NULL) {
+    return fgetc(filep->fp);
+  } else {
+    return EOF;
+  }
+}
+
+static void send_ssi_file(struct mg_connection *conn, const char *path,
+                          struct file *filep, int include_level) {
+  char buf[MG_BUF_LEN];
+  int ch, offset, len, in_ssi_tag;
+
+  if (include_level > 10) {
+    cry(conn, "SSI #include level is too deep (%s)", path);
+    return;
+  }
+
+  in_ssi_tag = len = offset = 0;
+  while ((ch = mg_fgetc(filep, offset)) != EOF) {
+    if (in_ssi_tag && ch == '>') {
+      in_ssi_tag = 0;
+      buf[len++] = (char) ch;
+      buf[len] = '\0';
+      assert(len <= (int) sizeof(buf));
+      if (len < 6 || memcmp(buf, "|<--data_len-->|
+    //     |<-conn->request_len->|<-----body_len----------->|
+    //     |<-------------------conn->data_len------------->|
+
+    if (header_len > 0) {
+      // Allocate space to hold websocket payload
+      data = mem;
+      if (data_len > sizeof(mem) && (data = malloc(data_len)) == NULL) {
+        // Allocation failed, exit the loop and then close the connection
+        // TODO: notify user about the failure
+        break;
+      }
+
+      // Save mask and bits, otherwise it may be clobbered by memmove below
+      bits = buf[0];
+      memcpy(mask, buf + header_len - mask_len, mask_len);
+
+      // Read frame payload into the allocated buffer.
+      assert(body_len >= header_len);
+      if (data_len + header_len > body_len) {
+        len = body_len - header_len;
+        memcpy(data, buf + header_len, len);
+        // TODO: handle pull error
+        pull_all(NULL, conn, data + len, data_len - len);
+        conn->data_len = conn->request_len;
+      } else {
+        len = data_len + header_len;
+        memcpy(data, buf + header_len, data_len);
+        memmove(buf, buf + len, body_len - len);
+        conn->data_len -= len;
+      }
+
+      // Apply mask if necessary
+      if (mask_len > 0) {
+        for (i = 0; i < data_len; i++) {
+          data[i] ^= mask[i % 4];
+        }
+      }
+
+      // Exit the loop if callback signalled to exit,
+      // or "connection close" opcode received.
+      if ((bits & WEBSOCKET_OPCODE_CONNECTION_CLOSE) ||
+          (conn->ctx->callbacks.websocket_data != NULL &&
+           !conn->ctx->callbacks.websocket_data(conn, bits, data, data_len))) {
+        stop = 1;
+      }
+
+      if (data != mem) {
+        free(data);
+      }
+      // Not breaking the loop, process next websocket frame.
+    } else {
+      // Buffering websocket request
+      if ((n = pull(NULL, conn, conn->buf + conn->data_len,
+                    conn->buf_size - conn->data_len)) <= 0) {
+        break;
+      }
+      conn->data_len += n;
+    }
+  }
+}
+
+int mg_websocket_write(struct mg_connection* conn, int opcode,
+                       const char *data, size_t data_len) {
+    unsigned char *copy;
+    size_t copy_len = 0;
+    int retval = -1;
+
+    if ((copy = (unsigned char *) malloc(data_len + 10)) == NULL) {
+      return -1;
+    }
+
+    copy[0] = 0x80 + (opcode & 0x0f);
+
+    // Frame format: http://tools.ietf.org/html/rfc6455#section-5.2
+    if (data_len < 126) {
+      // Inline 7-bit length field
+      copy[1] = data_len;
+      memcpy(copy + 2, data, data_len);
+      copy_len = 2 + data_len;
+    } else if (data_len <= 0xFFFF) {
+      // 16-bit length field
+      copy[1] = 126;
+      * (uint16_t *) (copy + 2) = htons(data_len);
+      memcpy(copy + 4, data, data_len);
+      copy_len = 4 + data_len;
+    } else {
+      // 64-bit length field
+      copy[1] = 127;
+      * (uint32_t *) (copy + 2) = htonl((uint64_t) data_len >> 32);
+      * (uint32_t *) (copy + 6) = htonl(data_len & 0xffffffff);
+      memcpy(copy + 10, data, data_len);
+      copy_len = 10 + data_len;
+    }
+
+    // Not thread safe
+    if (copy_len > 0) {
+      retval = mg_write(conn, copy, copy_len);
+    }
+    free(copy);
+
+    return retval;
+}
+
+static void handle_websocket_request(struct mg_connection *conn) {
+  const char *version = mg_get_header(conn, "Sec-WebSocket-Version");
+  if (version == NULL || strcmp(version, "13") != 0) {
+    send_http_error(conn, 426, "Upgrade Required", "%s", "Upgrade Required");
+  } else if (conn->ctx->callbacks.websocket_connect != NULL &&
+             conn->ctx->callbacks.websocket_connect(conn) != 0) {
+    // Callback has returned non-zero, do not proceed with handshake
+  } else {
+    send_websocket_handshake(conn);
+    if (conn->ctx->callbacks.websocket_ready != NULL) {
+      conn->ctx->callbacks.websocket_ready(conn);
+    }
+    read_websocket(conn);
+  }
+}
+
+static int is_websocket_request(const struct mg_connection *conn) {
+  const char *host, *upgrade, *connection, *version, *key;
+
+  host = mg_get_header(conn, "Host");
+  upgrade = mg_get_header(conn, "Upgrade");
+  connection = mg_get_header(conn, "Connection");
+  key = mg_get_header(conn, "Sec-WebSocket-Key");
+  version = mg_get_header(conn, "Sec-WebSocket-Version");
+
+  return host != NULL && upgrade != NULL && connection != NULL &&
+    key != NULL && version != NULL &&
+    mg_strcasestr(upgrade, "websocket") != NULL &&
+    mg_strcasestr(connection, "Upgrade") != NULL;
+}
+#endif // !USE_WEBSOCKET
+
+static int isbyte(int n) {
+  return n >= 0 && n <= 255;
+}
+
+static int parse_net(const char *spec, uint32_t *net, uint32_t *mask) {
+  int n, a, b, c, d, slash = 32, len = 0;
+
+  if ((sscanf(spec, "%d.%d.%d.%d/%d%n", &a, &b, &c, &d, &slash, &n) == 5 ||
+      sscanf(spec, "%d.%d.%d.%d%n", &a, &b, &c, &d, &n) == 4) &&
+      isbyte(a) && isbyte(b) && isbyte(c) && isbyte(d) &&
+      slash >= 0 && slash < 33) {
+    len = n;
+    *net = ((uint32_t)a << 24) | ((uint32_t)b << 16) | ((uint32_t)c << 8) | d;
+    *mask = slash ? 0xffffffffU << (32 - slash) : 0;
+  }
+
+  return len;
+}
+
+static int set_throttle(const char *spec, uint32_t remote_ip, const char *uri) {
+  int throttle = 0;
+  struct vec vec, val;
+  uint32_t net, mask;
+  char mult;
+  double v;
+
+  while ((spec = next_option(spec, &vec, &val)) != NULL) {
+    mult = ',';
+    if (sscanf(val.ptr, "%lf%c", &v, &mult) < 1 || v < 0 ||
+        (lowercase(&mult) != 'k' && lowercase(&mult) != 'm' && mult != ',')) {
+      continue;
+    }
+    v *= lowercase(&mult) == 'k' ? 1024 : lowercase(&mult) == 'm' ? 1048576 : 1;
+    if (vec.len == 1 && vec.ptr[0] == '*') {
+      throttle = (int) v;
+    } else if (parse_net(vec.ptr, &net, &mask) > 0) {
+      if ((remote_ip & mask) == net) {
+        throttle = (int) v;
+      }
+    } else if (match_prefix(vec.ptr, vec.len, uri) > 0) {
+      throttle = (int) v;
+    }
+  }
+
+  return throttle;
+}
+
+static uint32_t get_remote_ip(const struct mg_connection *conn) {
+  return ntohl(* (uint32_t *) &conn->client.rsa.sin.sin_addr);
+}
+
+#ifdef USE_LUA
+#include "mod_lua.c"
+#endif // USE_LUA
+
+int mg_upload(struct mg_connection *conn, const char *destination_dir) {
+  const char *content_type_header, *boundary_start;
+  char buf[MG_BUF_LEN], path[PATH_MAX], fname[1024], boundary[100], *s;
+  FILE *fp;
+  int bl, n, i, j, headers_len, boundary_len, eof,
+      len = 0, num_uploaded_files = 0;
+
+  // Request looks like this:
+  //
+  // POST /upload HTTP/1.1
+  // Host: 127.0.0.1:8080
+  // Content-Length: 244894
+  // Content-Type: multipart/form-data; boundary=----WebKitFormBoundaryRVr
+  //
+  // ------WebKitFormBoundaryRVr
+  // Content-Disposition: form-data; name="file"; filename="accum.png"
+  // Content-Type: image/png
+  //
+  //  <89>PNG
+  //  
+  // ------WebKitFormBoundaryRVr
+
+  // Extract boundary string from the Content-Type header
+  if ((content_type_header = mg_get_header(conn, "Content-Type")) == NULL ||
+      (boundary_start = mg_strcasestr(content_type_header,
+                                      "boundary=")) == NULL ||
+      (sscanf(boundary_start, "boundary=\"%99[^\"]\"", boundary) == 0 &&
+       sscanf(boundary_start, "boundary=%99s", boundary) == 0) ||
+      boundary[0] == '\0') {
+    return num_uploaded_files;
+  }
+
+  boundary_len = strlen(boundary);
+  bl = boundary_len + 4;  // \r\n--
+  for (;;) {
+    // Pull in headers
+    assert(len >= 0 && len <= (int) sizeof(buf));
+    while ((n = mg_read(conn, buf + len, sizeof(buf) - len)) > 0) {
+      len += n;
+    }
+    if ((headers_len = get_request_len(buf, len)) <= 0) {
+      break;
+    }
+
+    // Fetch file name.
+    fname[0] = '\0';
+    for (i = j = 0; i < headers_len; i++) {
+      if (buf[i] == '\r' && buf[i + 1] == '\n') {
+        buf[i] = buf[i + 1] = '\0';
+        // TODO(lsm): don't expect filename to be the 3rd field,
+        // parse the header properly instead.
+        sscanf(&buf[j], "Content-Disposition: %*s %*s filename=\"%1023[^\"]",
+               fname);
+        j = i + 2;
+      }
+    }
+
+    // Give up if the headers are not what we expect
+    if (fname[0] == '\0') {
+      break;
+    }
+
+    // Move data to the beginning of the buffer
+    assert(len >= headers_len);
+    memmove(buf, &buf[headers_len], len - headers_len);
+    len -= headers_len;
+
+    // We open the file with exclusive lock held. This guarantee us
+    // there is no other thread can save into the same file simultaneously.
+    fp = NULL;
+    // Construct destination file name. Do not allow paths to have slashes.
+    if ((s = strrchr(fname, '/')) == NULL &&
+        (s = strrchr(fname, '\\')) == NULL) {
+      s = fname;
+    }
+
+    // Open file in binary mode. TODO: set an exclusive lock.
+    snprintf(path, sizeof(path), "%s/%s", destination_dir, s);
+    if ((fp = fopen(path, "wb")) == NULL) {
+      break;
+    }
+
+    // Read POST data, write into file until boundary is found.
+    eof = n = 0;
+    do {
+      len += n;
+      for (i = 0; i < len - bl; i++) {
+        if (!memcmp(&buf[i], "\r\n--", 4) &&
+            !memcmp(&buf[i + 4], boundary, boundary_len)) {
+          // Found boundary, that's the end of file data.
+          fwrite(buf, 1, i, fp);
+          eof = 1;
+          memmove(buf, &buf[i + bl], len - (i + bl));
+          len -= i + bl;
+          break;
+        }
+      }
+      if (!eof && len > bl) {
+        fwrite(buf, 1, len - bl, fp);
+        memmove(buf, &buf[len - bl], bl);
+        len = bl;
+      }
+    } while (!eof && (n = mg_read(conn, buf + len, sizeof(buf) - len)) > 0);
+    fclose(fp);
+    if (eof) {
+      num_uploaded_files++;
+      if (conn->ctx->callbacks.upload != NULL) {
+        conn->ctx->callbacks.upload(conn, path);
+      }
+    }
+  }
+
+  return num_uploaded_files;
+}
+
+static int is_put_or_delete_request(const struct mg_connection *conn) {
+  const char *s = conn->request_info.request_method;
+  return s != NULL && (!strcmp(s, "PUT") ||
+                       !strcmp(s, "DELETE") ||
+                       !strcmp(s, "MKCOL"));
+}
+
+static int get_first_ssl_listener_index(const struct mg_context *ctx) {
+  int i, index = -1;
+  for (i = 0; index == -1 && i < ctx->num_listening_sockets; i++) {
+    index = ctx->listening_sockets[i].is_ssl ? i : -1;
+  }
+  return index;
+}
+
+static void redirect_to_https_port(struct mg_connection *conn, int ssl_index) {
+  char host[1025];
+  const char *host_header;
+
+  if ((host_header = mg_get_header(conn, "Host")) == NULL ||
+      sscanf(host_header, "%1024[^:]", host) == 0) {
+    // Cannot get host from the Host: header. Fallback to our IP address.
+    sockaddr_to_string(host, sizeof(host), &conn->client.lsa);
+  }
+
+  mg_printf(conn, "HTTP/1.1 302 Found\r\nLocation: https://%s:%d%s\r\n\r\n",
+            host, (int) ntohs(conn->ctx->listening_sockets[ssl_index].
+                              lsa.sin.sin_port), conn->request_info.uri);
+}
+
+// This is the heart of the Mongoose's logic.
+// This function is called when the request is read, parsed and validated,
+// and Mongoose must decide what action to take: serve a file, or
+// a directory, or call embedded function, etcetera.
+static void handle_request(struct mg_connection *conn) {
+  struct mg_request_info *ri = &conn->request_info;
+  char path[PATH_MAX];
+  int uri_len, ssl_index;
+  struct file file = STRUCT_FILE_INITIALIZER;
+
+  if ((conn->request_info.query_string = strchr(ri->uri, '?')) != NULL) {
+    * ((char *) conn->request_info.query_string++) = '\0';
+  }
+  uri_len = (int) strlen(ri->uri);
+  mg_url_decode(ri->uri, uri_len, (char *) ri->uri, uri_len + 1, 0);
+  remove_double_dots_and_double_slashes((char *) ri->uri);
+  convert_uri_to_file_name(conn, path, sizeof(path), &file);
+  conn->throttle = set_throttle(conn->ctx->config[THROTTLE],
+                                get_remote_ip(conn), ri->uri);
+
+  DEBUG_TRACE(("%s", ri->uri));
+  // Perform redirect and auth checks before calling begin_request() handler.
+  // Otherwise, begin_request() would need to perform auth checks and redirects.
+  if (!conn->client.is_ssl && conn->client.ssl_redir &&
+      (ssl_index = get_first_ssl_listener_index(conn->ctx)) > -1) {
+    redirect_to_https_port(conn, ssl_index);
+  } else if (!is_put_or_delete_request(conn) &&
+             !check_authorization(conn, path)) {
+    send_authorization_request(conn);
+  } else if (conn->ctx->callbacks.begin_request != NULL &&
+      conn->ctx->callbacks.begin_request(conn)) {
+    // Do nothing, callback has served the request
+#if defined(USE_WEBSOCKET)
+  } else if (is_websocket_request(conn)) {
+    handle_websocket_request(conn);
+#endif
+  } else if (!strcmp(ri->request_method, "OPTIONS")) {
+    send_options(conn);
+  } else if (conn->ctx->config[DOCUMENT_ROOT] == NULL) {
+    send_http_error(conn, 404, "Not Found", "Not Found");
+  } else if (is_put_or_delete_request(conn) &&
+             (is_authorized_for_put(conn) != 1)) {
+    send_authorization_request(conn);
+  } else if (!strcmp(ri->request_method, "PUT")) {
+    put_file(conn, path);
+  } else if (!strcmp(ri->request_method, "MKCOL")) {
+    mkcol(conn, path);
+  } else if (!strcmp(ri->request_method, "DELETE")) {
+      struct de de;
+      memset(&de.file, 0, sizeof(de.file));
+      if(!mg_stat(conn, path, &de.file)) {
+          send_http_error(conn, 404, "Not Found", "%s", "File not found");
+      } else {
+          if(de.file.modification_time) {
+              if(de.file.is_directory) {
+                  remove_directory(conn, path);
+                  send_http_error(conn, 204, "No Content", "%s", "");
+              } else if (mg_remove(path) == 0) {
+                  send_http_error(conn, 204, "No Content", "%s", "");
+              } else {
+                  send_http_error(conn, 423, "Locked", "remove(%s): %s", path,
+                          strerror(ERRNO));
+              }
+          }
+          else {
+              send_http_error(conn, 500, http_500_error, "remove(%s): %s", path,
+                    strerror(ERRNO));
+          }
+      }
+  } else if ((file.membuf == NULL && file.modification_time == (time_t) 0) ||
+             must_hide_file(conn, path)) {
+    send_http_error(conn, 404, "Not Found", "%s", "File not found");
+  } else if (file.is_directory && ri->uri[uri_len - 1] != '/') {
+    mg_printf(conn, "HTTP/1.1 301 Moved Permanently\r\n"
+              "Location: %s/\r\n\r\n", ri->uri);
+  } else if (!strcmp(ri->request_method, "PROPFIND")) {
+    handle_propfind(conn, path, &file);
+  } else if (file.is_directory &&
+             !substitute_index_file(conn, path, sizeof(path), &file)) {
+    if (!mg_strcasecmp(conn->ctx->config[ENABLE_DIRECTORY_LISTING], "yes")) {
+      handle_directory_request(conn, path);
+    } else {
+      send_http_error(conn, 403, "Directory Listing Denied",
+          "Directory listing denied");
+    }
+#ifdef USE_LUA
+  } else if (match_prefix("**.lp$", 6, path) > 0) {
+    handle_lsp_request(conn, path, &file, NULL);
+#endif
+#if !defined(NO_CGI)
+  } else if (match_prefix(conn->ctx->config[CGI_EXTENSIONS],
+                          strlen(conn->ctx->config[CGI_EXTENSIONS]),
+                          path) > 0) {
+    if (strcmp(ri->request_method, "POST") &&
+        strcmp(ri->request_method, "HEAD") &&
+        strcmp(ri->request_method, "GET")) {
+      send_http_error(conn, 501, "Not Implemented",
+                      "Method %s is not implemented", ri->request_method);
+    } else {
+      handle_cgi_request(conn, path);
+    }
+#endif // !NO_CGI
+  } else if (match_prefix(conn->ctx->config[SSI_EXTENSIONS],
+                          strlen(conn->ctx->config[SSI_EXTENSIONS]),
+                          path) > 0) {
+    handle_ssi_file_request(conn, path);
+  } else if (is_not_modified(conn, &file)) {
+    send_http_error(conn, 304, "Not Modified", "%s", "");
+  } else {
+    handle_file_request(conn, path, &file);
+  }
+}
+
+static void close_all_listening_sockets(struct mg_context *ctx) {
+  int i;
+  for (i = 0; i < ctx->num_listening_sockets; i++) {
+    closesocket(ctx->listening_sockets[i].sock);
+  }
+  free(ctx->listening_sockets);
+}
+
+static int is_valid_port(unsigned int port) {
+  return port > 0 && port < 0xffff;
+}
+
+// Valid listening port specification is: [ip_address:]port[s]
+// Examples: 80, 443s, 127.0.0.1:3128, 1.2.3.4:8080s
+// TODO(lsm): add parsing of the IPv6 address
+static int parse_port_string(const struct vec *vec, struct socket *so) {
+  unsigned int a, b, c, d, ch, len, port;
+#if defined(USE_IPV6)
+  char buf[100];
+#endif
+
+  // MacOS needs that. If we do not zero it, subsequent bind() will fail.
+  // Also, all-zeroes in the socket address means binding to all addresses
+  // for both IPv4 and IPv6 (INADDR_ANY and IN6ADDR_ANY_INIT).
+  memset(so, 0, sizeof(*so));
+  so->lsa.sin.sin_family = AF_INET;
+
+  if (sscanf(vec->ptr, "%u.%u.%u.%u:%u%n", &a, &b, &c, &d, &port, &len) == 5) {
+    // Bind to a specific IPv4 address, e.g. 192.168.1.5:8080
+    so->lsa.sin.sin_addr.s_addr = htonl((a << 24) | (b << 16) | (c << 8) | d);
+    so->lsa.sin.sin_port = htons((uint16_t) port);
+#if defined(USE_IPV6)
+
+  } else if (sscanf(vec->ptr, "[%49[^]]]:%d%n", buf, &port, &len) == 2 &&
+             inet_pton(AF_INET6, buf, &so->lsa.sin6.sin6_addr)) {
+    // IPv6 address, e.g. [3ffe:2a00:100:7031::1]:8080
+    so->lsa.sin6.sin6_family = AF_INET6;
+    so->lsa.sin6.sin6_port = htons((uint16_t) port);
+#endif
+  } else if (sscanf(vec->ptr, "%u%n", &port, &len) == 1) {
+    // If only port is specified, bind to IPv4, INADDR_ANY
+    so->lsa.sin.sin_port = htons((uint16_t) port);
+  } else {
+    port = len = 0;   // Parsing failure. Make port invalid.
+  }
+
+  ch = vec->ptr[len];  // Next character after the port number
+  so->is_ssl = ch == 's';
+  so->ssl_redir = ch == 'r';
+
+  // Make sure the port is valid and vector ends with 's', 'r' or ','
+  return is_valid_port(port) &&
+    (ch == '\0' || ch == 's' || ch == 'r' || ch == ',');
+}
+
+static int set_ports_option(struct mg_context *ctx) {
+  const char *list = ctx->config[LISTENING_PORTS];
+  int on = 1, success = 1;
+#if defined(USE_IPV6)
+  int off = 0;
+#endif
+  struct vec vec;
+  struct socket so, *ptr;
+
+  while (success && (list = next_option(list, &vec, NULL)) != NULL) {
+    if (!parse_port_string(&vec, &so)) {
+      cry(fc(ctx), "%s: %.*s: invalid port spec. Expecting list of: %s",
+          __func__, (int) vec.len, vec.ptr, "[IP_ADDRESS:]PORT[s|r]");
+      success = 0;
+    } else if (so.is_ssl && ctx->ssl_ctx == NULL) {
+      cry(fc(ctx), "Cannot add SSL socket, is -ssl_certificate option set?");
+      success = 0;
+    } else if ((so.sock = socket(so.lsa.sa.sa_family, SOCK_STREAM, 6)) ==
+               INVALID_SOCKET ||
+               // On Windows, SO_REUSEADDR is recommended only for
+               // broadcast UDP sockets
+               setsockopt(so.sock, SOL_SOCKET, SO_REUSEADDR,
+                          (void *) &on, sizeof(on)) != 0 ||
+#if defined(USE_IPV6)
+               (so.lsa.sa.sa_family == AF_INET6 &&
+                setsockopt(so.sock, IPPROTO_IPV6, IPV6_V6ONLY, (void *) &off,
+                           sizeof(off)) != 0) ||
+#endif
+               bind(so.sock, &so.lsa.sa, so.lsa.sa.sa_family == AF_INET ?
+                    sizeof(so.lsa.sin) : sizeof(so.lsa)) != 0 ||
+               listen(so.sock, SOMAXCONN) != 0) {
+      cry(fc(ctx), "%s: cannot bind to %.*s: %d (%s)", __func__,
+          (int) vec.len, vec.ptr, ERRNO, strerror(errno));
+      closesocket(so.sock);
+      success = 0;
+    } else if ((ptr = (struct socket *) realloc(ctx->listening_sockets,
+                              (ctx->num_listening_sockets + 1) *
+                              sizeof(ctx->listening_sockets[0]))) == NULL) {
+      closesocket(so.sock);
+      success = 0;
+    } else {
+      set_close_on_exec(so.sock);
+      ctx->listening_sockets = ptr;
+      ctx->listening_sockets[ctx->num_listening_sockets] = so;
+      ctx->num_listening_sockets++;
+    }
+  }
+
+  if (!success) {
+    close_all_listening_sockets(ctx);
+  }
+
+  return success;
+}
+
+static void log_header(const struct mg_connection *conn, const char *header,
+                       FILE *fp) {
+  const char *header_value;
+
+  if ((header_value = mg_get_header(conn, header)) == NULL) {
+    (void) fprintf(fp, "%s", " -");
+  } else {
+    (void) fprintf(fp, " \"%s\"", header_value);
+  }
+}
+
+static void log_access(const struct mg_connection *conn) {
+  const struct mg_request_info *ri;
+  FILE *fp;
+  char date[64], src_addr[IP_ADDR_STR_LEN];
+
+  fp = conn->ctx->config[ACCESS_LOG_FILE] == NULL ?  NULL :
+    fopen(conn->ctx->config[ACCESS_LOG_FILE], "a+");
+
+  if (fp == NULL)
+    return;
+
+  strftime(date, sizeof(date), "%d/%b/%Y:%H:%M:%S %z",
+           localtime(&conn->birth_time));
+
+  ri = &conn->request_info;
+  flockfile(fp);
+
+  sockaddr_to_string(src_addr, sizeof(src_addr), &conn->client.rsa);
+  fprintf(fp, "%s - %s [%s] \"%s %s HTTP/%s\" %d %" INT64_FMT,
+          src_addr, ri->remote_user == NULL ? "-" : ri->remote_user, date,
+          ri->request_method ? ri->request_method : "-",
+          ri->uri ? ri->uri : "-", ri->http_version,
+          conn->status_code, conn->num_bytes_sent);
+  log_header(conn, "Referer", fp);
+  log_header(conn, "User-Agent", fp);
+  fputc('\n', fp);
+  fflush(fp);
+
+  funlockfile(fp);
+  fclose(fp);
+}
+
+// Verify given socket address against the ACL.
+// Return -1 if ACL is malformed, 0 if address is disallowed, 1 if allowed.
+static int check_acl(struct mg_context *ctx, uint32_t remote_ip) {
+  int allowed, flag;
+  uint32_t net, mask;
+  struct vec vec;
+  const char *list = ctx->config[ACCESS_CONTROL_LIST];
+
+  // If any ACL is set, deny by default
+  allowed = list == NULL ? '+' : '-';
+
+  while ((list = next_option(list, &vec, NULL)) != NULL) {
+    flag = vec.ptr[0];
+    if ((flag != '+' && flag != '-') ||
+        parse_net(&vec.ptr[1], &net, &mask) == 0) {
+      cry(fc(ctx), "%s: subnet must be [+|-]x.x.x.x[/x]", __func__);
+      return -1;
+    }
+
+    if (net == (remote_ip & mask)) {
+      allowed = flag;
+    }
+  }
+
+  return allowed == '+';
+}
+
+#if !defined(_WIN32)
+static int set_uid_option(struct mg_context *ctx) {
+  struct passwd *pw;
+  const char *uid = ctx->config[RUN_AS_USER];
+  int success = 0;
+
+  if (uid == NULL) {
+    success = 1;
+  } else {
+    if ((pw = getpwnam(uid)) == NULL) {
+      cry(fc(ctx), "%s: unknown user [%s]", __func__, uid);
+    } else if (setgid(pw->pw_gid) == -1) {
+      cry(fc(ctx), "%s: setgid(%s): %s", __func__, uid, strerror(errno));
+    } else if (setuid(pw->pw_uid) == -1) {
+      cry(fc(ctx), "%s: setuid(%s): %s", __func__, uid, strerror(errno));
+    } else {
+      success = 1;
+    }
+  }
+
+  return success;
+}
+#endif // !_WIN32
+
+#if !defined(NO_SSL)
+static pthread_mutex_t *ssl_mutexes;
+
+static int sslize(struct mg_connection *conn, SSL_CTX *s, int (*func)(SSL *)) {
+  return (conn->ssl = SSL_new(s)) != NULL &&
+    SSL_set_fd(conn->ssl, conn->client.sock) == 1 &&
+    func(conn->ssl) == 1;
+}
+
+// Return OpenSSL error message
+static const char *ssl_error(void) {
+  unsigned long err;
+  err = ERR_get_error();
+  return err == 0 ? "" : ERR_error_string(err, NULL);
+}
+
+static void ssl_locking_callback(int mode, int mutex_num, const char *file,
+                                 int line) {
+  (void) line;
+  (void) file;
+
+  if (mode & 1) {  // 1 is CRYPTO_LOCK
+    (void) pthread_mutex_lock(&ssl_mutexes[mutex_num]);
+  } else {
+    (void) pthread_mutex_unlock(&ssl_mutexes[mutex_num]);
+  }
+}
+
+static unsigned long ssl_id_callback(void) {
+  return (unsigned long) pthread_self();
+}
+
+#if !defined(NO_SSL_DL)
+static int load_dll(struct mg_context *ctx, const char *dll_name,
+                    struct ssl_func *sw) {
+  union {void *p; void (*fp)(void);} u;
+  void  *dll_handle;
+  struct ssl_func *fp;
+
+  if ((dll_handle = dlopen(dll_name, RTLD_LAZY)) == NULL) {
+    cry(fc(ctx), "%s: cannot load %s", __func__, dll_name);
+    return 0;
+  }
+
+  for (fp = sw; fp->name != NULL; fp++) {
+#ifdef _WIN32
+    // GetProcAddress() returns pointer to function
+    u.fp = (void (*)(void)) dlsym(dll_handle, fp->name);
+#else
+    // dlsym() on UNIX returns void *. ISO C forbids casts of data pointers to
+    // function pointers. We need to use a union to make a cast.
+    u.p = dlsym(dll_handle, fp->name);
+#endif // _WIN32
+    if (u.fp == NULL) {
+      cry(fc(ctx), "%s: %s: cannot find %s", __func__, dll_name, fp->name);
+      return 0;
+    } else {
+      fp->ptr = u.fp;
+    }
+  }
+
+  return 1;
+}
+#endif // NO_SSL_DL
+
+// Dynamically load SSL library. Set up ctx->ssl_ctx pointer.
+static int set_ssl_option(struct mg_context *ctx) {
+  int i, size;
+  const char *pem;
+
+  // If PEM file is not specified and the init_ssl callback
+  // is not specified, skip SSL initialization.
+  if ((pem = ctx->config[SSL_CERTIFICATE]) == NULL &&
+      ctx->callbacks.init_ssl == NULL) {
+    return 1;
+  }
+
+#if !defined(NO_SSL_DL)
+  if (!load_dll(ctx, SSL_LIB, ssl_sw) ||
+      !load_dll(ctx, CRYPTO_LIB, crypto_sw)) {
+    return 0;
+  }
+#endif // NO_SSL_DL
+
+  // Initialize SSL library
+  SSL_library_init();
+  SSL_load_error_strings();
+
+  if ((ctx->ssl_ctx = SSL_CTX_new(SSLv23_server_method())) == NULL) {
+    cry(fc(ctx), "SSL_CTX_new (server) error: %s", ssl_error());
+    return 0;
+  }
+
+  // If user callback returned non-NULL, that means that user callback has
+  // set up certificate itself. In this case, skip sertificate setting.
+  if ((ctx->callbacks.init_ssl == NULL ||
+       !ctx->callbacks.init_ssl(ctx->ssl_ctx, ctx->user_data)) &&
+      (SSL_CTX_use_certificate_file(ctx->ssl_ctx, pem, 1) == 0 ||
+       SSL_CTX_use_PrivateKey_file(ctx->ssl_ctx, pem, 1) == 0)) {
+    cry(fc(ctx), "%s: cannot open %s: %s", __func__, pem, ssl_error());
+    return 0;
+  }
+
+  if (pem != NULL) {
+    (void) SSL_CTX_use_certificate_chain_file(ctx->ssl_ctx, pem);
+  }
+
+  // Initialize locking callbacks, needed for thread safety.
+  // http://www.openssl.org/support/faq.html#PROG1
+  size = sizeof(pthread_mutex_t) * CRYPTO_num_locks();
+  if ((ssl_mutexes = (pthread_mutex_t *) malloc((size_t)size)) == NULL) {
+    cry(fc(ctx), "%s: cannot allocate mutexes: %s", __func__, ssl_error());
+    return 0;
+  }
+
+  for (i = 0; i < CRYPTO_num_locks(); i++) {
+    pthread_mutex_init(&ssl_mutexes[i], NULL);
+  }
+
+  CRYPTO_set_locking_callback(&ssl_locking_callback);
+  CRYPTO_set_id_callback(&ssl_id_callback);
+
+  return 1;
+}
+
+static void uninitialize_ssl(struct mg_context *ctx) {
+  int i;
+  if (ctx->ssl_ctx != NULL) {
+    CRYPTO_set_locking_callback(NULL);
+    for (i = 0; i < CRYPTO_num_locks(); i++) {
+      pthread_mutex_destroy(&ssl_mutexes[i]);
+    }
+    CRYPTO_set_locking_callback(NULL);
+    CRYPTO_set_id_callback(NULL);
+  }
+}
+#endif // !NO_SSL
+
+static int set_gpass_option(struct mg_context *ctx) {
+  struct file file = STRUCT_FILE_INITIALIZER;
+  const char *path = ctx->config[GLOBAL_PASSWORDS_FILE];
+  if (path != NULL && !mg_stat(fc(ctx), path, &file)) {
+    cry(fc(ctx), "Cannot open %s: %s", path, strerror(ERRNO));
+    return 0;
+  }
+  return 1;
+}
+
+static int set_acl_option(struct mg_context *ctx) {
+  return check_acl(ctx, (uint32_t) 0x7f000001UL) != -1;
+}
+
+static void reset_per_request_attributes(struct mg_connection *conn) {
+  conn->path_info = NULL;
+  conn->num_bytes_sent = conn->consumed_content = 0;
+  conn->status_code = -1;
+  conn->must_close = conn->request_len = conn->throttle = 0;
+}
+
+static void close_socket_gracefully(struct mg_connection *conn) {
+#if defined(_WIN32)
+  char buf[MG_BUF_LEN];
+  int n;
+#endif
+  struct linger linger;
+
+  // Set linger option to avoid socket hanging out after close. This prevent
+  // ephemeral port exhaust problem under high QPS.
+  linger.l_onoff = 1;
+  linger.l_linger = 1;
+  setsockopt(conn->client.sock, SOL_SOCKET, SO_LINGER,
+             (char *) &linger, sizeof(linger));
+
+  // Send FIN to the client
+  shutdown(conn->client.sock, SHUT_WR);
+  set_non_blocking_mode(conn->client.sock);
+
+#if defined(_WIN32)
+  // Read and discard pending incoming data. If we do not do that and close the
+  // socket, the data in the send buffer may be discarded. This
+  // behaviour is seen on Windows, when client keeps sending data
+  // when server decides to close the connection; then when client
+  // does recv() it gets no data back.
+  do {
+    n = pull(NULL, conn, buf, sizeof(buf));
+  } while (n > 0);
+#endif
+
+  // Now we know that our FIN is ACK-ed, safe to close
+  closesocket(conn->client.sock);
+}
+
+static void close_connection(struct mg_connection *conn) {
+  conn->must_close = 1;
+
+#ifndef NO_SSL
+  if (conn->ssl != NULL) {
+    // Run SSL_shutdown twice to ensure completly close SSL connection
+    SSL_shutdown(conn->ssl);
+    SSL_free(conn->ssl);
+    conn->ssl = NULL;
+  }
+#endif
+  if (conn->client.sock != INVALID_SOCKET) {
+    close_socket_gracefully(conn);
+    conn->client.sock = INVALID_SOCKET;
+  }
+}
+
+void mg_close_connection(struct mg_connection *conn) {
+#ifndef NO_SSL
+  if (conn->client_ssl_ctx != NULL) {
+    SSL_CTX_free((SSL_CTX *) conn->client_ssl_ctx);
+  }
+#endif
+  close_connection(conn);
+  free(conn);
+}
+
+static struct mg_connection *mg_connect(const char *host, int port, int use_ssl,
+                                        char *ebuf, size_t ebuf_len) {
+  static struct mg_context fake_ctx;
+  struct mg_connection *conn = NULL;
+  SOCKET sock;
+
+  if ((sock = conn2(host, port, use_ssl, ebuf, ebuf_len)) == INVALID_SOCKET) {
+  } else if ((conn = (struct mg_connection *)
+              calloc(1, sizeof(*conn) + MAX_REQUEST_SIZE)) == NULL) {
+    snprintf(ebuf, ebuf_len, "calloc(): %s", strerror(ERRNO));
+    closesocket(sock);
+#ifndef NO_SSL
+  } else if (use_ssl && (conn->client_ssl_ctx =
+                         SSL_CTX_new(SSLv23_client_method())) == NULL) {
+    snprintf(ebuf, ebuf_len, "SSL_CTX_new error");
+    closesocket(sock);
+    free(conn);
+    conn = NULL;
+#endif // NO_SSL
+  } else {
+    socklen_t len = sizeof(struct sockaddr);
+    conn->buf_size = MAX_REQUEST_SIZE;
+    conn->buf = (char *) (conn + 1);
+    conn->ctx = &fake_ctx;
+    conn->client.sock = sock;
+    getsockname(sock, &conn->client.rsa.sa, &len);
+    conn->client.is_ssl = use_ssl;
+#ifndef NO_SSL
+    if (use_ssl) {
+      // SSL_CTX_set_verify call is needed to switch off server certificate
+      // checking, which is off by default in OpenSSL and on in yaSSL.
+      SSL_CTX_set_verify(conn->client_ssl_ctx, 0, 0);
+      sslize(conn, conn->client_ssl_ctx, SSL_connect);
+    }
+#endif
+  }
+
+  return conn;
+}
+
+static int is_valid_uri(const char *uri) {
+  // Conform to http://www.w3.org/Protocols/rfc2616/rfc2616-sec5.html#sec5.1.2
+  // URI can be an asterisk (*) or should start with slash.
+  return uri[0] == '/' || (uri[0] == '*' && uri[1] == '\0');
+}
+
+static int getreq(struct mg_connection *conn, char *ebuf, size_t ebuf_len) {
+  const char *cl;
+
+  ebuf[0] = '\0';
+  reset_per_request_attributes(conn);
+  conn->request_len = read_request(NULL, conn, conn->buf, conn->buf_size,
+                                   &conn->data_len);
+  assert(conn->request_len < 0 || conn->data_len >= conn->request_len);
+
+  if (conn->request_len == 0 && conn->data_len == conn->buf_size) {
+    snprintf(ebuf, ebuf_len, "%s", "Request Too Large");
+  } else if (conn->request_len <= 0) {
+    snprintf(ebuf, ebuf_len, "%s", "Client closed connection");
+  } else if (parse_http_message(conn->buf, conn->buf_size,
+                                &conn->request_info) <= 0) {
+    snprintf(ebuf, ebuf_len, "Bad request: [%.*s]", conn->data_len, conn->buf);
+  } else {
+    // Request is valid
+    if ((cl = get_header(&conn->request_info, "Content-Length")) != NULL) {
+      conn->content_len = strtoll(cl, NULL, 10);
+    } else if (!mg_strcasecmp(conn->request_info.request_method, "POST") ||
+               !mg_strcasecmp(conn->request_info.request_method, "PUT")) {
+      conn->content_len = -1;
+    } else {
+      conn->content_len = 0;
+    }
+    conn->birth_time = time(NULL);
+  }
+  return ebuf[0] == '\0';
+}
+
+struct mg_connection *mg_download(const char *host, int port, int use_ssl,
+                                  char *ebuf, size_t ebuf_len,
+                                  const char *fmt, ...) {
+  struct mg_connection *conn;
+  va_list ap;
+
+  va_start(ap, fmt);
+  ebuf[0] = '\0';
+  if ((conn = mg_connect(host, port, use_ssl, ebuf, ebuf_len)) == NULL) {
+  } else if (mg_vprintf(conn, fmt, ap) <= 0) {
+    snprintf(ebuf, ebuf_len, "%s", "Error sending request");
+  } else {
+    getreq(conn, ebuf, ebuf_len);
+  }
+  if (ebuf[0] != '\0' && conn != NULL) {
+    mg_close_connection(conn);
+    conn = NULL;
+  }
+
+  return conn;
+}
+
+static void process_new_connection(struct mg_connection *conn) {
+  struct mg_request_info *ri = &conn->request_info;
+  int keep_alive_enabled, keep_alive, discard_len;
+  char ebuf[100];
+
+  keep_alive_enabled = !strcmp(conn->ctx->config[ENABLE_KEEP_ALIVE], "yes");
+  keep_alive = 0;
+
+  // Important: on new connection, reset the receiving buffer. Credit goes
+  // to crule42.
+  conn->data_len = 0;
+  do {
+    if (!getreq(conn, ebuf, sizeof(ebuf))) {
+      send_http_error(conn, 500, "Server Error", "%s", ebuf);
+      conn->must_close = 1;
+    } else if (!is_valid_uri(conn->request_info.uri)) {
+      snprintf(ebuf, sizeof(ebuf), "Invalid URI: [%s]", ri->uri);
+      send_http_error(conn, 400, "Bad Request", "%s", ebuf);
+    } else if (strcmp(ri->http_version, "1.0") &&
+               strcmp(ri->http_version, "1.1")) {
+      snprintf(ebuf, sizeof(ebuf), "Bad HTTP version: [%s]", ri->http_version);
+      send_http_error(conn, 505, "Bad HTTP version", "%s", ebuf);
+    }
+
+    if (ebuf[0] == '\0') {
+      handle_request(conn);
+      if (conn->ctx->callbacks.end_request != NULL) {
+        conn->ctx->callbacks.end_request(conn, conn->status_code);
+      }
+      log_access(conn);
+    }
+    if (ri->remote_user != NULL) {
+      free((void *) ri->remote_user);
+      // Important! When having connections with and without auth
+      // would cause double free and then crash
+      ri->remote_user = NULL;
+    }
+
+    // NOTE(lsm): order is important here. should_keep_alive() call
+    // is using parsed request, which will be invalid after memmove's below.
+    // Therefore, memorize should_keep_alive() result now for later use
+    // in loop exit condition.
+    keep_alive = conn->ctx->stop_flag == 0 && keep_alive_enabled &&
+      conn->content_len >= 0 && should_keep_alive(conn);
+
+    // Discard all buffered data for this request
+    discard_len = conn->content_len >= 0 && conn->request_len > 0 &&
+      conn->request_len + conn->content_len < (int64_t) conn->data_len ?
+      (int) (conn->request_len + conn->content_len) : conn->data_len;
+    assert(discard_len >= 0);
+    memmove(conn->buf, conn->buf + discard_len, conn->data_len - discard_len);
+    conn->data_len -= discard_len;
+    assert(conn->data_len >= 0);
+    assert(conn->data_len <= conn->buf_size);
+  } while (keep_alive);
+}
+
+// Worker threads take accepted socket from the queue
+static int consume_socket(struct mg_context *ctx, struct socket *sp) {
+  (void) pthread_mutex_lock(&ctx->mutex);
+  DEBUG_TRACE(("going idle"));
+
+  // If the queue is empty, wait. We're idle at this point.
+  while (ctx->sq_head == ctx->sq_tail && ctx->stop_flag == 0) {
+    pthread_cond_wait(&ctx->sq_full, &ctx->mutex);
+  }
+
+  // If we're stopping, sq_head may be equal to sq_tail.
+  if (ctx->sq_head > ctx->sq_tail) {
+    // Copy socket from the queue and increment tail
+    *sp = ctx->queue[ctx->sq_tail % ARRAY_SIZE(ctx->queue)];
+    ctx->sq_tail++;
+    DEBUG_TRACE(("grabbed socket %d, going busy", sp->sock));
+
+    // Wrap pointers if needed
+    while (ctx->sq_tail > (int) ARRAY_SIZE(ctx->queue)) {
+      ctx->sq_tail -= ARRAY_SIZE(ctx->queue);
+      ctx->sq_head -= ARRAY_SIZE(ctx->queue);
+    }
+  }
+
+  (void) pthread_cond_signal(&ctx->sq_empty);
+  (void) pthread_mutex_unlock(&ctx->mutex);
+
+  return !ctx->stop_flag;
+}
+
+static void *worker_thread(void *thread_func_param) {
+  struct mg_context *ctx = (struct mg_context *) thread_func_param;
+  struct mg_connection *conn;
+
+  conn = (struct mg_connection *) calloc(1, sizeof(*conn) + MAX_REQUEST_SIZE);
+  if (conn == NULL) {
+    cry(fc(ctx), "%s", "Cannot create new connection struct, OOM");
+  } else {
+    conn->buf_size = MAX_REQUEST_SIZE;
+    conn->buf = (char *) (conn + 1);
+    conn->ctx = ctx;
+    conn->request_info.user_data = ctx->user_data;
+
+    // Call consume_socket() even when ctx->stop_flag > 0, to let it signal
+    // sq_empty condvar to wake up the master waiting in produce_socket()
+    while (consume_socket(ctx, &conn->client)) {
+      conn->birth_time = time(NULL);
+
+      // Fill in IP, port info early so even if SSL setup below fails,
+      // error handler would have the corresponding info.
+      // Thanks to Johannes Winkelmann for the patch.
+      // TODO(lsm): Fix IPv6 case
+      conn->request_info.remote_port = ntohs(conn->client.rsa.sin.sin_port);
+      memcpy(&conn->request_info.remote_ip,
+             &conn->client.rsa.sin.sin_addr.s_addr, 4);
+      conn->request_info.remote_ip = ntohl(conn->request_info.remote_ip);
+      conn->request_info.is_ssl = conn->client.is_ssl;
+
+      if (!conn->client.is_ssl
+#ifndef NO_SSL
+          || sslize(conn, conn->ctx->ssl_ctx, SSL_accept)
+#endif
+         ) {
+        process_new_connection(conn);
+      }
+
+      close_connection(conn);
+    }
+    free(conn);
+  }
+
+  // Signal master that we're done with connection and exiting
+  (void) pthread_mutex_lock(&ctx->mutex);
+  ctx->num_threads--;
+  (void) pthread_cond_signal(&ctx->cond);
+  assert(ctx->num_threads >= 0);
+  (void) pthread_mutex_unlock(&ctx->mutex);
+
+  DEBUG_TRACE(("exiting"));
+  return NULL;
+}
+
+// Master thread adds accepted socket to a queue
+static void produce_socket(struct mg_context *ctx, const struct socket *sp) {
+  (void) pthread_mutex_lock(&ctx->mutex);
+
+  // If the queue is full, wait
+  while (ctx->stop_flag == 0 &&
+         ctx->sq_head - ctx->sq_tail >= (int) ARRAY_SIZE(ctx->queue)) {
+    (void) pthread_cond_wait(&ctx->sq_empty, &ctx->mutex);
+  }
+
+  if (ctx->sq_head - ctx->sq_tail < (int) ARRAY_SIZE(ctx->queue)) {
+    // Copy socket to the queue and increment head
+    ctx->queue[ctx->sq_head % ARRAY_SIZE(ctx->queue)] = *sp;
+    ctx->sq_head++;
+    DEBUG_TRACE(("queued socket %d", sp->sock));
+  }
+
+  (void) pthread_cond_signal(&ctx->sq_full);
+  (void) pthread_mutex_unlock(&ctx->mutex);
+}
+
+static int set_sock_timeout(SOCKET sock, int milliseconds) {
+#ifdef _WIN32
+  DWORD t = milliseconds;
+#else
+  struct timeval t;
+  t.tv_sec = milliseconds / 1000;
+  t.tv_usec = (milliseconds * 1000) % 1000000;
+#endif
+  return setsockopt(sock, SOL_SOCKET, SO_RCVTIMEO, (void *) &t, sizeof(t)) ||
+    setsockopt(sock, SOL_SOCKET, SO_SNDTIMEO, (void *) &t, sizeof(t));
+}
+
+static void accept_new_connection(const struct socket *listener,
+                                  struct mg_context *ctx) {
+  struct socket so;
+  char src_addr[IP_ADDR_STR_LEN];
+  socklen_t len = sizeof(so.rsa);
+  int on = 1;
+
+  if ((so.sock = accept(listener->sock, &so.rsa.sa, &len)) == INVALID_SOCKET) {
+  } else if (!check_acl(ctx, ntohl(* (uint32_t *) &so.rsa.sin.sin_addr))) {
+    sockaddr_to_string(src_addr, sizeof(src_addr), &so.rsa);
+    cry(fc(ctx), "%s: %s is not allowed to connect", __func__, src_addr);
+    closesocket(so.sock);
+  } else {
+    // Put so socket structure into the queue
+    DEBUG_TRACE(("Accepted socket %d", (int) so.sock));
+    set_close_on_exec(so.sock);
+    so.is_ssl = listener->is_ssl;
+    so.ssl_redir = listener->ssl_redir;
+    getsockname(so.sock, &so.lsa.sa, &len);
+    // Set TCP keep-alive. This is needed because if HTTP-level keep-alive
+    // is enabled, and client resets the connection, server won't get
+    // TCP FIN or RST and will keep the connection open forever. With TCP
+    // keep-alive, next keep-alive handshake will figure out that the client
+    // is down and will close the server end.
+    // Thanks to Igor Klopov who suggested the patch.
+    setsockopt(so.sock, SOL_SOCKET, SO_KEEPALIVE, (void *) &on, sizeof(on));
+    set_sock_timeout(so.sock, atoi(ctx->config[REQUEST_TIMEOUT]));
+    produce_socket(ctx, &so);
+  }
+}
+
+static void *master_thread(void *thread_func_param) {
+  struct mg_context *ctx = (struct mg_context *) thread_func_param;
+  struct pollfd *pfd;
+  int i;
+
+  // Increase priority of the master thread
+#if defined(_WIN32)
+  SetThreadPriority(GetCurrentThread(), THREAD_PRIORITY_ABOVE_NORMAL);
+#endif
+
+#if defined(ISSUE_317)
+  struct sched_param sched_param;
+  sched_param.sched_priority = sched_get_priority_max(SCHED_RR);
+  pthread_setschedparam(pthread_self(), SCHED_RR, &sched_param);
+#endif
+
+  pfd = (struct pollfd *) calloc(ctx->num_listening_sockets, sizeof(pfd[0]));
+  while (pfd != NULL && ctx->stop_flag == 0) {
+    for (i = 0; i < ctx->num_listening_sockets; i++) {
+      pfd[i].fd = ctx->listening_sockets[i].sock;
+      pfd[i].events = POLLIN;
+    }
+
+    if (poll(pfd, ctx->num_listening_sockets, 200) > 0) {
+      for (i = 0; i < ctx->num_listening_sockets; i++) {
+        // NOTE(lsm): on QNX, poll() returns POLLRDNORM after the
+        // successfull poll, and POLLIN is defined as (POLLRDNORM | POLLRDBAND)
+        // Therefore, we're checking pfd[i].revents & POLLIN, not
+        // pfd[i].revents == POLLIN.
+        if (ctx->stop_flag == 0 && (pfd[i].revents & POLLIN)) {
+          accept_new_connection(&ctx->listening_sockets[i], ctx);
+        }
+      }
+    }
+  }
+  free(pfd);
+  DEBUG_TRACE(("stopping workers"));
+
+  // Stop signal received: somebody called mg_stop. Quit.
+  close_all_listening_sockets(ctx);
+
+  // Wakeup workers that are waiting for connections to handle.
+  pthread_cond_broadcast(&ctx->sq_full);
+
+  // Wait until all threads finish
+  (void) pthread_mutex_lock(&ctx->mutex);
+  while (ctx->num_threads > 0) {
+    (void) pthread_cond_wait(&ctx->cond, &ctx->mutex);
+  }
+  (void) pthread_mutex_unlock(&ctx->mutex);
+
+  // All threads exited, no sync is needed. Destroy mutex and condvars
+  (void) pthread_mutex_destroy(&ctx->mutex);
+  (void) pthread_cond_destroy(&ctx->cond);
+  (void) pthread_cond_destroy(&ctx->sq_empty);
+  (void) pthread_cond_destroy(&ctx->sq_full);
+
+#if !defined(NO_SSL)
+  uninitialize_ssl(ctx);
+#endif
+  DEBUG_TRACE(("exiting"));
+
+  // Signal mg_stop() that we're done.
+  // WARNING: This must be the very last thing this
+  // thread does, as ctx becomes invalid after this line.
+  ctx->stop_flag = 2;
+  return NULL;
+}
+
+static void free_context(struct mg_context *ctx) {
+  int i;
+
+  // Deallocate config parameters
+  for (i = 0; i < NUM_OPTIONS; i++) {
+    if (ctx->config[i] != NULL)
+      free(ctx->config[i]);
+  }
+
+#ifndef NO_SSL
+  // Deallocate SSL context
+  if (ctx->ssl_ctx != NULL) {
+    SSL_CTX_free(ctx->ssl_ctx);
+  }
+  if (ssl_mutexes != NULL) {
+    free(ssl_mutexes);
+    ssl_mutexes = NULL;
+  }
+#endif // !NO_SSL
+
+  // Deallocate context itself
+  free(ctx);
+}
+
+void mg_stop(struct mg_context *ctx) {
+  ctx->stop_flag = 1;
+
+  // Wait until mg_fini() stops
+  while (ctx->stop_flag != 2) {
+    (void) mg_sleep(10);
+  }
+  free_context(ctx);
+
+#if defined(_WIN32) && !defined(__SYMBIAN32__)
+  (void) WSACleanup();
+#endif // _WIN32
+}
+
+struct mg_context *mg_start(const struct mg_callbacks *callbacks,
+                            void *user_data,
+                            const char **options) {
+  struct mg_context *ctx;
+  const char *name, *value, *default_value;
+  int i;
+
+#if defined(_WIN32) && !defined(__SYMBIAN32__)
+  WSADATA data;
+  WSAStartup(MAKEWORD(2,2), &data);
+  InitializeCriticalSection(&global_log_file_lock);
+#endif // _WIN32
+
+  // Allocate context and initialize reasonable general case defaults.
+  // TODO(lsm): do proper error handling here.
+  if ((ctx = (struct mg_context *) calloc(1, sizeof(*ctx))) == NULL) {
+    return NULL;
+  }
+  ctx->callbacks = *callbacks;
+  ctx->user_data = user_data;
+
+  while (options && (name = *options++) != NULL) {
+    if ((i = get_option_index(name)) == -1) {
+      cry(fc(ctx), "Invalid option: %s", name);
+      free_context(ctx);
+      return NULL;
+    } else if ((value = *options++) == NULL) {
+      cry(fc(ctx), "%s: option value cannot be NULL", name);
+      free_context(ctx);
+      return NULL;
+    }
+    if (ctx->config[i] != NULL) {
+      cry(fc(ctx), "warning: %s: duplicate option", name);
+      free(ctx->config[i]);
+    }
+    ctx->config[i] = mg_strdup(value);
+    DEBUG_TRACE(("[%s] -> [%s]", name, value));
+  }
+
+  // Set default value if needed
+  for (i = 0; config_options[i * 2] != NULL; i++) {
+    default_value = config_options[i * 2 + 1];
+    if (ctx->config[i] == NULL && default_value != NULL) {
+      ctx->config[i] = mg_strdup(default_value);
+    }
+  }
+
+  // NOTE(lsm): order is important here. SSL certificates must
+  // be initialized before listening ports. UID must be set last.
+  if (!set_gpass_option(ctx) ||
+#if !defined(NO_SSL)
+      !set_ssl_option(ctx) ||
+#endif
+      !set_ports_option(ctx) ||
+#if !defined(_WIN32)
+      !set_uid_option(ctx) ||
+#endif
+      !set_acl_option(ctx)) {
+    free_context(ctx);
+    return NULL;
+  }
+
+#if !defined(_WIN32) && !defined(__SYMBIAN32__)
+  // Ignore SIGPIPE signal, so if browser cancels the request, it
+  // won't kill the whole process.
+  (void) signal(SIGPIPE, SIG_IGN);
+  // Also ignoring SIGCHLD to let the OS to reap zombies properly.
+  (void) signal(SIGCHLD, SIG_IGN);
+#endif // !_WIN32
+
+  (void) pthread_mutex_init(&ctx->mutex, NULL);
+  (void) pthread_cond_init(&ctx->cond, NULL);
+  (void) pthread_cond_init(&ctx->sq_empty, NULL);
+  (void) pthread_cond_init(&ctx->sq_full, NULL);
+
+  // Start master (listening) thread
+  mg_start_thread(master_thread, ctx);
+
+  // Start worker threads
+  for (i = 0; i < atoi(ctx->config[NUM_THREADS]); i++) {
+    if (mg_start_thread(worker_thread, ctx) != 0) {
+      cry(fc(ctx), "Cannot start worker thread: %ld", (long) ERRNO);
+    } else {
+      ctx->num_threads++;
+    }
+  }
+
+  return ctx;
+}
diff --git a/rtemsbsd/mghttpd/mongoose.h b/rtemsbsd/mghttpd/mongoose.h
new file mode 100644
index 00000000..ad7c40f2
--- /dev/null
+++ b/rtemsbsd/mghttpd/mongoose.h
@@ -0,0 +1,386 @@
+// Copyright (c) 2004-2012 Sergey Lyubka
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights
+// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in
+// all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+// THE SOFTWARE.
+
+#ifndef MONGOOSE_HEADER_INCLUDED
+#define  MONGOOSE_HEADER_INCLUDED
+
+#include 
+#include 
+
+#ifdef __cplusplus
+extern "C" {
+#endif // __cplusplus
+
+struct mg_context;     // Handle for the HTTP service itself
+struct mg_connection;  // Handle for the individual connection
+
+
+// This structure contains information about the HTTP request.
+struct mg_request_info {
+  const char *request_method; // "GET", "POST", etc
+  const char *uri;            // URL-decoded URI
+  const char *http_version;   // E.g. "1.0", "1.1"
+  const char *query_string;   // URL part after '?', not including '?', or NULL
+  const char *remote_user;    // Authenticated user, or NULL if no auth used
+  long remote_ip;             // Client's IP address
+  int remote_port;            // Client's port
+  int is_ssl;                 // 1 if SSL-ed, 0 if not
+  void *user_data;            // User data pointer passed to mg_start()
+  void *conn_data;            // Connection-specific user data
+
+  int num_headers;            // Number of HTTP headers
+  struct mg_header {
+    const char *name;         // HTTP header name
+    const char *value;        // HTTP header value
+  } http_headers[64];         // Maximum 64 headers
+};
+
+
+// This structure needs to be passed to mg_start(), to let mongoose know
+// which callbacks to invoke. For detailed description, see
+// https://github.com/valenok/mongoose/blob/master/UserManual.md
+struct mg_callbacks {
+  // Called when mongoose has received new HTTP request.
+  // If callback returns non-zero,
+  // callback must process the request by sending valid HTTP headers and body,
+  // and mongoose will not do any further processing.
+  // If callback returns 0, mongoose processes the request itself. In this case,
+  // callback must not send any data to the client.
+  int  (*begin_request)(struct mg_connection *);
+
+  // Called when mongoose has finished processing request.
+  void (*end_request)(const struct mg_connection *, int reply_status_code);
+
+  // Called when mongoose is about to log a message. If callback returns
+  // non-zero, mongoose does not log anything.
+  int  (*log_message)(const struct mg_connection *, const char *message);
+
+  // Called when mongoose initializes SSL library.
+  int  (*init_ssl)(void *ssl_context, void *user_data);
+
+  // Called when websocket request is received, before websocket handshake.
+  // If callback returns 0, mongoose proceeds with handshake, otherwise
+  // cinnection is closed immediately.
+  int (*websocket_connect)(const struct mg_connection *);
+
+  // Called when websocket handshake is successfully completed, and
+  // connection is ready for data exchange.
+  void (*websocket_ready)(struct mg_connection *);
+
+  // Called when data frame has been received from the client.
+  // Parameters:
+  //    bits: first byte of the websocket frame, see websocket RFC at
+  //          http://tools.ietf.org/html/rfc6455, section 5.2
+  //    data, data_len: payload, with mask (if any) already applied.
+  // Return value:
+  //    non-0: keep this websocket connection opened.
+  //    0:     close this websocket connection.
+  int  (*websocket_data)(struct mg_connection *, int bits,
+                         char *data, size_t data_len);
+
+  // Called when mongoose tries to open a file. Used to intercept file open
+  // calls, and serve file data from memory instead.
+  // Parameters:
+  //    path:     Full path to the file to open.
+  //    data_len: Placeholder for the file size, if file is served from memory.
+  // Return value:
+  //    NULL: do not serve file from memory, proceed with normal file open.
+  //    non-NULL: pointer to the file contents in memory. data_len must be
+  //              initilized with the size of the memory block.
+  const char * (*open_file)(const struct mg_connection *,
+                             const char *path, size_t *data_len);
+
+  // Called when mongoose is about to serve Lua server page (.lp file), if
+  // Lua support is enabled.
+  // Parameters:
+  //   lua_context: "lua_State *" pointer.
+  void (*init_lua)(struct mg_connection *, void *lua_context);
+
+  // Called when mongoose has uploaded a file to a temporary directory as a
+  // result of mg_upload() call.
+  // Parameters:
+  //    file_file: full path name to the uploaded file.
+  void (*upload)(struct mg_connection *, const char *file_name);
+
+  // Called when mongoose is about to send HTTP error to the client.
+  // Implementing this callback allows to create custom error pages.
+  // Parameters:
+  //   status: HTTP error status code.
+  int  (*http_error)(struct mg_connection *, int status);
+};
+
+// Start web server.
+//
+// Parameters:
+//   callbacks: mg_callbacks structure with user-defined callbacks.
+//   options: NULL terminated list of option_name, option_value pairs that
+//            specify Mongoose configuration parameters.
+//
+// Side-effects: on UNIX, ignores SIGCHLD and SIGPIPE signals. If custom
+//    processing is required for these, signal handlers must be set up
+//    after calling mg_start().
+//
+//
+// Example:
+//   const char *options[] = {
+//     "document_root", "/var/www",
+//     "listening_ports", "80,443s",
+//     NULL
+//   };
+//   struct mg_context *ctx = mg_start(&my_func, NULL, options);
+//
+// Refer to https://github.com/valenok/mongoose/blob/master/UserManual.md
+// for the list of valid option and their possible values.
+//
+// Return:
+//   web server context, or NULL on error.
+struct mg_context *mg_start(const struct mg_callbacks *callbacks,
+                            void *user_data,
+                            const char **configuration_options);
+
+
+// Stop the web server.
+//
+// Must be called last, when an application wants to stop the web server and
+// release all associated resources. This function blocks until all Mongoose
+// threads are stopped. Context pointer becomes invalid.
+void mg_stop(struct mg_context *);
+
+
+// Get the value of particular configuration parameter.
+// The value returned is read-only. Mongoose does not allow changing
+// configuration at run time.
+// If given parameter name is not valid, NULL is returned. For valid
+// names, return value is guaranteed to be non-NULL. If parameter is not
+// set, zero-length string is returned.
+const char *mg_get_option(const struct mg_context *ctx, const char *name);
+
+
+// Return array of strings that represent valid configuration options.
+// For each option, option name and default value is returned, i.e. the
+// number of entries in the array equals to number_of_options x 2.
+// Array is NULL terminated.
+const char **mg_get_valid_option_names(void);
+
+
+// Add, edit or delete the entry in the passwords file.
+//
+// This function allows an application to manipulate .htpasswd files on the
+// fly by adding, deleting and changing user records. This is one of the
+// several ways of implementing authentication on the server side. For another,
+// cookie-based way please refer to the examples/chat.c in the source tree.
+//
+// If password is not NULL, entry is added (or modified if already exists).
+// If password is NULL, entry is deleted.
+//
+// Return:
+//   1 on success, 0 on error.
+int mg_modify_passwords_file(const char *passwords_file_name,
+                             const char *domain,
+                             const char *user,
+                             const char *password);
+
+
+// Return information associated with the request.
+struct mg_request_info *mg_get_request_info(struct mg_connection *);
+
+
+// Send data to the client.
+// Return:
+//  0   when the connection has been closed
+//  -1  on error
+//  >0  number of bytes written on success
+int mg_write(struct mg_connection *, const void *buf, size_t len);
+
+
+// Send data to a websocket client wrapped in a websocket frame.
+// It is unsafe to read/write to this connection from another thread.
+// This function is available when mongoose is compiled with -DUSE_WEBSOCKET
+//
+// Return:
+//  0   when the connection has been closed
+//  -1  on error
+//  >0  number of bytes written on success
+int mg_websocket_write(struct mg_connection* conn, int opcode,
+                       const char *data, size_t data_len);
+
+// Opcodes, from http://tools.ietf.org/html/rfc6455
+enum {
+  WEBSOCKET_OPCODE_CONTINUATION = 0x0,
+  WEBSOCKET_OPCODE_TEXT = 0x1,
+  WEBSOCKET_OPCODE_BINARY = 0x2,
+  WEBSOCKET_OPCODE_CONNECTION_CLOSE = 0x8,
+  WEBSOCKET_OPCODE_PING = 0x9,
+  WEBSOCKET_OPCODE_PONG = 0xa
+};
+
+
+// Macros for enabling compiler-specific checks for printf-like arguments.
+#undef PRINTF_FORMAT_STRING
+#if defined(_MSC_VER) && _MSC_VER >= 1400
+#include 
+#if defined(_MSC_VER) && _MSC_VER > 1400
+#define PRINTF_FORMAT_STRING(s) _Printf_format_string_ s
+#else
+#define PRINTF_FORMAT_STRING(s) __format_string s
+#endif
+#else
+#define PRINTF_FORMAT_STRING(s) s
+#endif
+
+#ifdef __GNUC__
+#define PRINTF_ARGS(x, y) __attribute__((format(printf, x, y)))
+#else
+#define PRINTF_ARGS(x, y)
+#endif
+
+// Send data to the client using printf() semantics.
+//
+// Works exactly like mg_write(), but allows to do message formatting.
+int mg_printf(struct mg_connection *,
+              PRINTF_FORMAT_STRING(const char *fmt), ...) PRINTF_ARGS(2, 3);
+
+
+// Send contents of the entire file together with HTTP headers.
+void mg_send_file(struct mg_connection *conn, const char *path);
+
+
+// Read data from the remote end, return number of bytes read.
+// Return:
+//   0     connection has been closed by peer. No more data could be read.
+//   < 0   read error. No more data could be read from the connection.
+//   > 0   number of bytes read into the buffer.
+int mg_read(struct mg_connection *, void *buf, size_t len);
+
+
+// Get the value of particular HTTP header.
+//
+// This is a helper function. It traverses request_info->http_headers array,
+// and if the header is present in the array, returns its value. If it is
+// not present, NULL is returned.
+const char *mg_get_header(const struct mg_connection *, const char *name);
+
+
+// Get a value of particular form variable.
+//
+// Parameters:
+//   data: pointer to form-uri-encoded buffer. This could be either POST data,
+//         or request_info.query_string.
+//   data_len: length of the encoded data.
+//   var_name: variable name to decode from the buffer
+//   dst: destination buffer for the decoded variable
+//   dst_len: length of the destination buffer
+//
+// Return:
+//   On success, length of the decoded variable.
+//   On error:
+//      -1 (variable not found).
+//      -2 (destination buffer is NULL, zero length or too small to hold the
+//          decoded variable).
+//
+// Destination buffer is guaranteed to be '\0' - terminated if it is not
+// NULL or zero length.
+int mg_get_var(const char *data, size_t data_len,
+               const char *var_name, char *dst, size_t dst_len);
+
+// Fetch value of certain cookie variable into the destination buffer.
+//
+// Destination buffer is guaranteed to be '\0' - terminated. In case of
+// failure, dst[0] == '\0'. Note that RFC allows many occurrences of the same
+// parameter. This function returns only first occurrence.
+//
+// Return:
+//   On success, value length.
+//   On error:
+//      -1 (either "Cookie:" header is not present at all or the requested
+//          parameter is not found).
+//      -2 (destination buffer is NULL, zero length or too small to hold the
+//          value).
+int mg_get_cookie(const char *cookie, const char *var_name,
+                  char *buf, size_t buf_len);
+
+
+// Download data from the remote web server.
+//   host: host name to connect to, e.g. "foo.com", or "10.12.40.1".
+//   port: port number, e.g. 80.
+//   use_ssl: wether to use SSL connection.
+//   error_buffer, error_buffer_size: error message placeholder.
+//   request_fmt,...: HTTP request.
+// Return:
+//   On success, valid pointer to the new connection, suitable for mg_read().
+//   On error, NULL. error_buffer contains error message.
+// Example:
+//   char ebuf[100];
+//   struct mg_connection *conn;
+//   conn = mg_download("google.com", 80, 0, ebuf, sizeof(ebuf),
+//                      "%s", "GET / HTTP/1.0\r\nHost: google.com\r\n\r\n");
+struct mg_connection *mg_download(const char *host, int port, int use_ssl,
+                                  char *error_buffer, size_t error_buffer_size,
+                                  PRINTF_FORMAT_STRING(const char *request_fmt),
+                                  ...) PRINTF_ARGS(6, 7);
+
+
+// Close the connection opened by mg_download().
+void mg_close_connection(struct mg_connection *conn);
+
+
+// File upload functionality. Each uploaded file gets saved into a temporary
+// file and MG_UPLOAD event is sent.
+// Return number of uploaded files.
+int mg_upload(struct mg_connection *conn, const char *destination_dir);
+
+
+// Convenience function -- create detached thread.
+// Return: 0 on success, non-0 on error.
+typedef void * (*mg_thread_func_t)(void *);
+int mg_start_thread(mg_thread_func_t f, void *p);
+
+
+// Return builtin mime type for the given file name.
+// For unrecognized extensions, "text/plain" is returned.
+const char *mg_get_builtin_mime_type(const char *file_name);
+
+
+// Return Mongoose version.
+const char *mg_version(void);
+
+// URL-decode input buffer into destination buffer.
+// 0-terminate the destination buffer.
+// form-url-encoded data differs from URI encoding in a way that it
+// uses '+' as character for space, see RFC 1866 section 8.2.1
+// http://ftp.ics.uci.edu/pub/ietf/html/rfc1866.txt
+// Return: length of the decoded data, or -1 if dst buffer is too small.
+int mg_url_decode(const char *src, int src_len, char *dst,
+                  int dst_len, int is_form_url_encoded);
+
+// MD5 hash given strings.
+// Buffer 'buf' must be 33 bytes long. Varargs is a NULL terminated list of
+// ASCIIz strings. When function returns, buf will contain human-readable
+// MD5 hash. Example:
+//   char buf[33];
+//   mg_md5(buf, "aa", "bb", NULL);
+char *mg_md5(char buf[33], ...);
+
+
+#ifdef __cplusplus
+}
+#endif // __cplusplus
+
+#endif // MONGOOSE_HEADER_INCLUDED
-- 
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