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Diffstat (limited to 'cpukit/mghttpd/mongoose.c')
| -rw-r--r-- | cpukit/mghttpd/mongoose.c | 4739 |
1 files changed, 4739 insertions, 0 deletions
diff --git a/cpukit/mghttpd/mongoose.c b/cpukit/mghttpd/mongoose.c new file mode 100644 index 0000000000..f863847491 --- /dev/null +++ b/cpukit/mghttpd/mongoose.c @@ -0,0 +1,4739 @@ +/* + * Copyright (c) 2004-2009 Sergey Lyubka + * Portions Copyright (c) 2009 Gilbert Wellisch + * + * 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. + * + * $Id$ + */ + +#if HAVE_CONFIG_H +#include "config.h" +#endif + +#if defined(_WIN32) +#define _CRT_SECURE_NO_WARNINGS /* Disable deprecation warning in VS2005 */ +#endif /* _WIN32 */ + +#ifndef _WIN32_WCE /* Some ANSI #includes are not available on Windows CE */ +#include <sys/types.h> +#include <sys/stat.h> +#include <errno.h> +#include <signal.h> +#include <fcntl.h> +#endif /* !_WIN32_WCE */ + +#include <time.h> +#include <stdlib.h> +#include <stdarg.h> +#include <assert.h> +#include <string.h> +#include <ctype.h> +#include <limits.h> +#include <stddef.h> +#include <stdio.h> + +#if defined(_WIN32) /* Windows specific #includes and #defines */ +#define _WIN32_WINNT 0x0400 /* To make it link in VS2005 */ +#include <windows.h> + +#ifndef _WIN32_WCE +#include <process.h> +#include <direct.h> +#include <io.h> +#else /* _WIN32_WCE */ +/* Windows CE-specific definitions */ +#include <winsock2.h> +#define NO_CGI /* WinCE has no pipes */ +#define NO_SSI /* WinCE has no pipes */ + +#define FILENAME_MAX MAX_PATH +#define BUFSIZ 4096 +typedef long off_t; + +#define errno GetLastError() +#define strerror(x) _ultoa(x, (char *) _alloca(sizeof(x) *3 ), 10) +#endif /* _WIN32_WCE */ + +#define EPOCH_DIFF 0x019DB1DED53E8000 /* 116444736000000000 nsecs */ +#define RATE_DIFF 10000000 /* 100 nsecs */ +#define MAKEUQUAD(lo, hi) ((uint64_t)(((uint32_t)(lo)) | \ + ((uint64_t)((uint32_t)(hi))) << 32)) +#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__ "line " STR(__LINE__) +#define strtoull(x, y, z) strtoul(x, y, z) +#else +#define __func__ __FUNCTION__ +#define strtoull(x, y, z) _strtoui64(x, y, z) +#endif /* _MSC_VER */ + +#define ERRNO GetLastError() +#define NO_SOCKLEN_T +#define SSL_LIB "ssleay32.dll" +#define CRYPTO_LIB "libeay32.dll" +#define DIRSEP '\\' +#define IS_DIRSEP_CHAR(c) ((c) == '/' || (c) == '\\') +#define O_NONBLOCK 0 +#define EWOULDBLOCK WSAEWOULDBLOCK +#define _POSIX_ +#define INT64_FMT "I64" + +#define SHUT_WR 1 +#define snprintf _snprintf +#define vsnprintf _vsnprintf +#define sleep(x) Sleep((x) * 1000) + +#define popen(x, y) _popen(x, y) +#define pclose(x) _pclose(x) +#define close(x) _close(x) +#define dlsym(x,y) GetProcAddress((HINSTANCE) (x), (y)) +#define RTLD_LAZY 0 +#define fseeko(x, y, z) fseek((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) (void) 0 +#define funlockfile(x) (void) 0 + +#if !defined(fileno) +#define fileno(x) _fileno(x) +#endif /* !fileno MINGW #defines fileno */ + +typedef HANDLE pthread_mutex_t; +typedef HANDLE pthread_cond_t; +typedef DWORD pthread_t; +#define pid_t HANDLE /* MINGW typedefs pid_t to int. Using #define here. */ + +struct timespec { + long tv_nsec; + long tv_sec; +}; + +static int pthread_mutex_lock(pthread_mutex_t *); +static int pthread_mutex_unlock(pthread_mutex_t *); + +#if defined(HAVE_STDINT) +#include <stdint.h> +#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[FILENAME_MAX]; +}; + +typedef struct DIR { + HANDLE handle; + WIN32_FIND_DATAW info; + struct dirent result; +} DIR; + +#else /* UNIX specific */ +#include <sys/wait.h> +#include <sys/socket.h> +#include <sys/select.h> +#if HAVE_SYS_MMAN_H +#include <sys/mman.h> +#endif +#if defined(__rtems__) +#define flockfile(x) (void) 0 +#define funlockfile(x) (void) 0 +#endif +#include <netinet/in.h> +#include <arpa/inet.h> +#include <sys/time.h> +#include <stdint.h> +#include <inttypes.h> + +#include <pwd.h> +#include <unistd.h> +#include <dirent.h> +#if HAVE_DLFCN_H +#include <dlfcn.h> +#endif +#include <pthread.h> +#define SSL_LIB "libssl.so" +#define CRYPTO_LIB "libcrypto.so" +#define DIRSEP '/' +#define IS_DIRSEP_CHAR(c) ((c) == '/') +#define O_BINARY 0 +#define closesocket(a) close(a) +#define mg_fopen(x, y) fopen(x, y) +#define mg_mkdir(x, y) mkdir(x, y) +#define mg_remove(x) remove(x) +#define mg_rename(x, y) rename(x, y) +#define ERRNO errno +#define INVALID_SOCKET (-1) +#define INT64_FMT PRId64 +typedef int SOCKET; + +#endif /* End of Windows and UNIX specific includes */ + +#include "mongoose.h" + +#define MONGOOSE_VERSION "2.9" +#define PASSWORDS_FILE_NAME ".htpasswd" +#define CGI_ENVIRONMENT_SIZE 4096 +#define MAX_CGI_ENVIR_VARS 64 +#define MAX_REQUEST_SIZE 8192 +#define MAX_LISTENING_SOCKETS 10 +#define MAX_CALLBACKS 20 +#define ARRAY_SIZE(array) (sizeof(array) / sizeof(array[0])) +#define DEBUG_MGS_PREFIX "*** Mongoose debug *** " + +#if defined(DEBUG) +#define DEBUG_TRACE(x) do {printf x; putchar('\n'); fflush(stdout);} while (0) +#else +#define DEBUG_TRACE(x) +#endif /* DEBUG */ + +/* + * Darwin prior to 7.0 and Win32 do not have socklen_t + */ +#ifdef NO_SOCKLEN_T +typedef int socklen_t; +#endif /* NO_SOCKLEN_T */ + +#if !defined(FALSE) +enum {FALSE, TRUE}; +#endif /* !FALSE */ + +typedef int bool_t; +typedef void * (*mg_thread_func_t)(void *); + +static const char *http_500_error = "Internal Server Error"; + +/* + * Snatched from OpenSSL includes. I put the prototypes here to be independent + * from the OpenSSL source installation. Having this, mongoose + SSL can be + * built on any system with binary SSL libraries installed. + */ +typedef struct ssl_st SSL; +typedef struct ssl_method_st SSL_METHOD; +typedef struct ssl_ctx_st SSL_CTX; + +#define SSL_ERROR_WANT_READ 2 +#define SSL_ERROR_WANT_WRITE 3 +#define SSL_FILETYPE_PEM 1 +#define CRYPTO_LOCK 1 + +/* + * Dynamically loaded SSL functionality + */ +struct ssl_func { + const char *name; /* SSL function name */ + void (*ptr)(void); /* Function pointer */ +}; + +#define SSL_free(x) (* (void (*)(SSL *)) ssl_sw[0].ptr)(x) +#define SSL_accept(x) (* (int (*)(SSL *)) ssl_sw[1].ptr)(x) +#define SSL_connect(x) (* (int (*)(SSL *)) ssl_sw[2].ptr)(x) +#define SSL_read(x,y,z) (* (int (*)(SSL *, void *, int)) \ + ssl_sw[3].ptr)((x),(y),(z)) +#define SSL_write(x,y,z) (* (int (*)(SSL *, const void *,int)) \ + ssl_sw[4].ptr)((x), (y), (z)) +#define SSL_get_error(x,y)(* (int (*)(SSL *, int)) ssl_sw[5])((x), (y)) +#define SSL_set_fd(x,y) (* (int (*)(SSL *, SOCKET)) ssl_sw[6].ptr)((x), (y)) +#define SSL_new(x) (* (SSL * (*)(SSL_CTX *)) ssl_sw[7].ptr)(x) +#define SSL_CTX_new(x) (* (SSL_CTX * (*)(SSL_METHOD *)) ssl_sw[8].ptr)(x) +#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(x,y,z) (* (int (*)(SSL_CTX *, \ + const char *, int)) ssl_sw[11].ptr)((x), (y), (z)) +#define SSL_CTX_use_certificate_file(x,y,z) (* (int (*)(SSL_CTX *, \ + const char *, int)) ssl_sw[12].ptr)((x), (y), (z)) +#define SSL_CTX_set_default_passwd_cb(x,y) \ + (* (void (*)(SSL_CTX *, mg_spcb_t)) ssl_sw[13].ptr)((x),(y)) +#define SSL_CTX_free(x) (* (void (*)(SSL_CTX *)) ssl_sw[14].ptr)(x) + +#define CRYPTO_num_locks() (* (int (*)(void)) crypto_sw[0].ptr)() +#define CRYPTO_set_locking_callback(x) \ + (* (void (*)(void (*)(int, int, const char *, int))) \ + crypto_sw[1].ptr)(x) +#define CRYPTO_set_id_callback(x) \ + (* (void (*)(unsigned long (*)(void))) crypto_sw[2].ptr)(x) + +/* + * set_ssl_option() function when called, 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}, + {NULL, NULL} +}; + +#if !defined(NO_SSL) +/* + * Similar array as ssl_sw. These functions are located in different lib. + */ +static struct ssl_func crypto_sw[] = { + {"CRYPTO_num_locks", NULL}, + {"CRYPTO_set_locking_callback", NULL}, + {"CRYPTO_set_id_callback", NULL}, + {NULL, NULL} +}; +#endif + +/* + * Month names + */ +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. + */ +struct usa { + socklen_t len; + union { + struct sockaddr sa; + struct sockaddr_in sin; + } u; +}; + +/* + * Specifies a string (chunk of memory). + * Used to traverse comma separated lists of options. + */ +struct vec { + const char *ptr; + size_t len; +}; + +/* + * Structure used by mg_stat() function. Uses 64 bit file length. + */ +struct mgstat { + bool_t is_directory; /* Directory marker */ + int64_t size; /* File size */ + time_t mtime; /* Modification time */ +}; + +struct mg_option { + const char *name; + const char *description; + const char *default_value; + int index; + bool_t (*setter)(struct mg_context *, const char *); +}; + +/* + * Numeric indexes for the option values in context, ctx->options + */ +enum mg_option_index { + OPT_ROOT, OPT_INDEX_FILES, OPT_PORTS, OPT_DIR_LIST, OPT_CGI_EXTENSIONS, + OPT_CGI_INTERPRETER, OPT_CGI_ENV, OPT_SSI_EXTENSIONS, OPT_AUTH_DOMAIN, + OPT_AUTH_GPASSWD, OPT_AUTH_PUT, OPT_ACCESS_LOG, OPT_ERROR_LOG, + OPT_SSL_CERTIFICATE, OPT_ALIASES, OPT_ACL, OPT_UID, OPT_PROTECT, + OPT_SERVICE, OPT_HIDE, OPT_ADMIN_URI, OPT_MAX_THREADS, OPT_IDLE_TIME, + OPT_MIME_TYPES, + NUM_OPTIONS +}; + +/* + * Structure used to describe 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 */ + struct usa lsa; /* Local socket address */ + struct usa rsa; /* Remote socket address */ + bool_t is_ssl; /* Is socket SSL-ed */ +}; + +/* + * Callback function, and where it is bound to + */ +struct callback { + char *uri_regex; /* URI regex to handle */ + mg_callback_t func; /* user callback */ + bool_t is_auth; /* func is auth checker */ + int status_code; /* error code to handle */ + void *user_data; /* opaque user data */ +}; + +/* + * Mongoose context + */ +struct mg_context { + int stop_flag; /* Should we stop event loop */ + SSL_CTX *ssl_ctx; /* SSL context */ + + FILE *access_log; /* Opened access log */ + FILE *error_log; /* Opened error log */ + + struct socket listeners[MAX_LISTENING_SOCKETS]; + int num_listeners; + + struct callback callbacks[MAX_CALLBACKS]; + int num_callbacks; + + char *options[NUM_OPTIONS]; /* Configured opions */ + pthread_mutex_t opt_mutex[NUM_OPTIONS]; /* Option protector */ + + int max_threads; /* Maximum number of threads */ + int num_threads; /* Number of threads */ + int num_idle; /* Number of idle threads */ + pthread_mutex_t thr_mutex; /* Protects (max|num)_threads */ + pthread_cond_t thr_cond; + pthread_mutex_t bind_mutex; /* Protects bind operations */ + + struct socket queue[20]; /* Accepted sockets */ + int sq_head; /* Head of the socket queue */ + int sq_tail; /* Tail of the socket queue */ + pthread_cond_t empty_cond; /* Socket queue empty condvar */ + pthread_cond_t full_cond; /* Socket queue full condvar */ + + mg_spcb_t ssl_password_callback; + mg_callback_t log_callback; +}; + +/* + * Client connection. + */ +struct mg_connection { + struct mg_request_info request_info; + struct mg_context *ctx; /* Mongoose context we belong to*/ + SSL *ssl; /* SSL descriptor */ + struct socket client; /* Connected client */ + time_t birth_time; /* Time connection was accepted */ + bool_t free_post_data; /* post_data was malloc-ed */ + bool_t embedded_auth; /* Used for authorization */ + int64_t num_bytes_sent; /* Total bytes sent to client */ +}; + +/* + * Print error message to the opened error log stream. + */ +static void +cry(struct mg_connection *conn, const char *fmt, ...) +{ + char buf[BUFSIZ]; + va_list ap; + + va_start(ap, fmt); + (void) vsnprintf(buf, sizeof(buf), fmt, ap); + conn->ctx->log_callback(conn, &conn->request_info, buf); + va_end(ap); +} + +/* + * 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); +} + +/* + * If an embedded code does not intercept logging by calling + * mg_set_log_callback(), this function is used for logging. It prints + * stuff to the conn->error_log, which is stderr unless "error_log" + * option was set. + */ +static void +builtin_error_log(struct mg_connection *conn, + const struct mg_request_info *request_info, void *message) +{ + FILE *fp; + time_t timestamp; + + fp = conn->ctx->error_log; + flockfile(fp); + + timestamp = time(NULL); + + (void) fprintf(fp, + "[%010lu] [error] [client %s] ", + (unsigned long) timestamp, + inet_ntoa(conn->client.rsa.u.sin.sin_addr)); + + if (request_info->request_method != NULL) + (void) fprintf(fp, "%s %s: ", + request_info->request_method, + request_info->uri); + + (void) fprintf(fp, "%s", (char *) message); + + fputc('\n', fp); + + funlockfile(fp); +} + +const char * +mg_version(void) +{ + return (MONGOOSE_VERSION); +} + +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(* (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))); +} + +/* + * Like snprintf(), but never returns negative value, or the 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, 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); +} + +/* + * Convert string representing a boolean value to a boolean value + */ +static bool_t +is_true(const char *str) +{ + static const char *trues[] = {"1", "yes", "true", "ja", NULL}; + int i; + + for (i = 0; trues[i] != NULL; i++) + if (str != NULL && mg_strcasecmp(str, trues[i]) == 0) + return (TRUE); + + return (FALSE); +} + +/* + * Skip the characters until one of the delimiters characters found. + * 0-terminate resulting word. Skip the rest of the delimiters if any. + * Advance pointer to buffer to the next word. Return found 0-terminated word. + */ +static char * +skip(char **buf, const char *delimiters) +{ + char *p, *begin_word, *end_word, *end_delimiters; + + begin_word = *buf; + end_word = begin_word + strcspn(begin_word, delimiters); + end_delimiters = end_word + strspn(end_word, delimiters); + + for (p = end_word; p < end_delimiters; p++) + *p = '\0'; + + *buf = end_delimiters; + + return (begin_word); +} + +/* + * 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 comma separated list of values. + * It returns a list pointer shifted to the next value, of 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 = 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); +} + +#if !(defined(NO_CGI) && defined(NO_SSI)) +/* + * Verify that given file has certain extension + */ +static bool_t +match_extension(const char *path, const char *ext_list) +{ + struct vec ext_vec; + size_t path_len; + + path_len = strlen(path); + + while ((ext_list = next_option(ext_list, &ext_vec, NULL)) != NULL) + if (ext_vec.len < path_len && + mg_strncasecmp(path + path_len - ext_vec.len, + ext_vec.ptr, ext_vec.len) == 0) + return (TRUE); + + return (FALSE); +} +#endif /* !(NO_CGI && NO_SSI) */ + +/* + * Return TRUE if "uri" matches "regexp". + * '*' in the regexp means zero or more characters. + */ +static bool_t +match_regex(const char *uri, const char *regexp) +{ + if (*regexp == '\0') + return (*uri == '\0'); + + if (*regexp == '*') + do { + if (match_regex(uri, regexp + 1)) + return (TRUE); + } while (*uri++ != '\0'); + + if (*uri != '\0' && *regexp == *uri) + return (match_regex(uri + 1, regexp + 1)); + + return (FALSE); +} + +static const struct callback * +find_callback(struct mg_context *ctx, bool_t is_auth, + const char *uri, int status_code) +{ + const struct callback *cb, *found; + int i; + + found = NULL; + pthread_mutex_lock(&ctx->bind_mutex); + for (i = 0; i < ctx->num_callbacks; i++) { + cb = ctx->callbacks + i; + if ((uri != NULL && cb->uri_regex != NULL && + ((is_auth && cb->is_auth) || (!is_auth && !cb->is_auth)) && + match_regex(uri, cb->uri_regex)) || (uri == NULL && + (cb->status_code == 0 || + cb->status_code == status_code))) { + found = cb; + break; + } + } + pthread_mutex_unlock(&ctx->bind_mutex); + + return (found); +} + +/* + * For use by external application. This sets custom logging function. + */ +void +mg_set_log_callback(struct mg_context *ctx, mg_callback_t log_callback) +{ + /* If NULL is specified as a callback, revert back to the default */ + if (log_callback == NULL) + ctx->log_callback = &builtin_error_log; + else + ctx->log_callback = log_callback; +} + +/* + * Send error message back to the client. + */ +static void +send_error(struct mg_connection *conn, int status, const char *reason, + const char *fmt, ...) +{ + const struct callback *cb; + char buf[BUFSIZ]; + va_list ap; + int len; + + conn->request_info.status_code = status; + + /* If error handler is set, call it. Otherwise, send error message */ + if ((cb = find_callback(conn->ctx, FALSE, NULL, status)) != NULL) { + cb->func(conn, &conn->request_info, cb->user_data); + } else { + buf[0] = '\0'; + len = 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\n", status, reason); + cry(conn, "%s", buf); + + va_start(ap, fmt); + len += mg_vsnprintf(conn, buf + len, sizeof(buf) - len, + fmt, ap); + va_end(ap); + conn->num_bytes_sent = len; + } + + (void) mg_printf(conn, + "HTTP/1.1 %d %s\r\n" + "Content-Type: text/plain\r\n" + "Content-Length: %d\r\n" + "Connection: close\r\n" + "\r\n%s", status, reason, len, buf); + } +} + +#ifdef _WIN32 +static int +pthread_mutex_init(pthread_mutex_t *mutex, void *unused) +{ + unused = NULL; + *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) +{ + unused = NULL; + *cv = CreateEvent(NULL, FALSE, FALSE, NULL); + return (*cv == NULL ? -1 : 0); +} + +static int +pthread_cond_timedwait(pthread_cond_t *cv, pthread_mutex_t *mutex, + const struct timespec *ts) +{ + DWORD status; + DWORD msec = INFINITE; + time_t now; + + if (ts != NULL) { + now = time(NULL); + msec = 1000 * (now > ts->tv_sec ? 0 : ts->tv_sec - now); + } + + (void) ReleaseMutex(*mutex); + status = WaitForSingleObject(*cv, msec); + (void) WaitForSingleObject(*mutex, INFINITE); + + return (status == WAIT_OBJECT_0 ? 0 : -1); +} + +static int +pthread_cond_wait(pthread_cond_t *cv, pthread_mutex_t *mutex) +{ + return (pthread_cond_timedwait(cv, mutex, NULL)); +} + +static int +pthread_cond_signal(pthread_cond_t *cv) +{ + return (SetEvent(*cv) == 0 ? -1 : 0); +} + +static int +pthread_cond_destroy(pthread_cond_t *cv) +{ + return (CloseHandle(*cv) == 0 ? -1 : 0); +} + +static pthread_t +pthread_self(void) +{ + return (GetCurrentThreadId()); +} + +/* + * Change all slashes to backslashes. It is Windows. + */ +static void +fix_directory_separators(char *path) +{ + int i; + + for (i = 0; path[i] != '\0'; i++) { + if (path[i] == '/') + path[i] = '\\'; + /* i > 0 check is to preserve UNC paths, \\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[FILENAME_MAX], *p; + + mg_strlcpy(buf, path, sizeof(buf)); + fix_directory_separators(buf); + + /* Point p to the end of the file name */ + p = buf + strlen(buf) - 1; + + /* Trim trailing backslash character */ + while (p > buf && *p == '\\' && p[-1] != ':') + *p-- = '\0'; + + /* + * Protect from CGI code disclosure. + * This is very nasty hole. Windows happily opens files with + * some garbage in the end of file name. So fopen("a.cgi ", "r") + * actually opens "a.cgi", and does not return an error! + */ + if (*p == 0x20 || /* No space at the end */ + (*p == 0x2e && p > buf) || /* No '.' but allow '.' as full path */ + *p == 0x2b || /* No '+' */ + (*p & ~0x7f)) { /* And generally no non-ascii chars */ + (void) fprintf(stderr, "Rejecting suspicious path: [%s]", buf); + buf[0] = '\0'; + } + + (void) MultiByteToWideChar(CP_UTF8, 0, buf, -1, wbuf, (int) wbuf_len); +} + +#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 time_t +mktime(struct tm *ptm) +{ + SYSTEMTIME st; + FILETIME ft, lft; + + st.wYear = ptm->tm_year + 1900; + st.wMonth = ptm->tm_mon + 1; + st.wDay = ptm->tm_mday; + st.wHour = ptm->tm_hour; + st.wMinute = ptm->tm_min; + st.wSecond = ptm->tm_sec; + st.wMilliseconds = 0; + + SystemTimeToFileTime(&st, &ft); + LocalFileTimeToFileTime(&ft, &lft); + return (time_t)((MAKEUQUAD(lft.dwLowDateTime, lft.dwHighDateTime) - + EPOCH_DIFF) / RATE_DIFF); +} + +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 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 + +static int +mg_rename(const char* oldname, const char* newname) +{ + wchar_t woldbuf[FILENAME_MAX]; + wchar_t wnewbuf[FILENAME_MAX]; + + to_unicode(oldname, woldbuf, ARRAY_SIZE(woldbuf)); + to_unicode(newname, wnewbuf, ARRAY_SIZE(wnewbuf)); + + return (MoveFileW(woldbuf, wnewbuf) ? 0 : -1); +} + + +static FILE * +mg_fopen(const char *path, const char *mode) +{ + wchar_t wbuf[FILENAME_MAX], wmode[20]; + + to_unicode(path, wbuf, ARRAY_SIZE(wbuf)); + MultiByteToWideChar(CP_UTF8, 0, mode, -1, wmode, ARRAY_SIZE(wmode)); + + return (_wfopen(wbuf, wmode)); +} + +static int +mg_stat(const char *path, struct mgstat *stp) +{ + int ok = -1; /* Error */ + wchar_t wbuf[FILENAME_MAX]; + WIN32_FILE_ATTRIBUTE_DATA info; + + to_unicode(path, wbuf, ARRAY_SIZE(wbuf)); + + if (GetFileAttributesExW(wbuf, GetFileExInfoStandard, &info) != 0) { + stp->size = MAKEUQUAD(info.nFileSizeLow, info.nFileSizeHigh); + stp->mtime = SYS2UNIX_TIME(info.ftLastWriteTime.dwLowDateTime, + info.ftLastWriteTime.dwHighDateTime); + stp->is_directory = + info.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY; + ok = 0; /* Success */ + } + + return (ok); +} + +static int +mg_remove(const char *path) +{ + wchar_t wbuf[FILENAME_MAX]; + + to_unicode(path, wbuf, ARRAY_SIZE(wbuf)); + + return (DeleteFileW(wbuf) ? 0 : -1); +} + +static int +mg_mkdir(const char *path, int mode) +{ + char buf[FILENAME_MAX]; + wchar_t wbuf[FILENAME_MAX]; + + mode = 0; /* Unused */ + mg_strlcpy(buf, path, sizeof(buf)); + fix_directory_separators(buf); + + (void) MultiByteToWideChar(CP_UTF8, 0, buf, -1, wbuf, sizeof(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[FILENAME_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); +} + +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); +} + +#define set_close_on_exec(fd) /* No FD_CLOEXEC on Windows */ + +static int +start_thread(struct mg_context *ctx, mg_thread_func_t func, void *param) +{ + HANDLE hThread; + + ctx = NULL; /* Unused */ + + hThread = CreateThread(NULL, 0, + (LPTHREAD_START_ROUTINE) func, param, 0, NULL); + + if (hThread != NULL) + (void) CloseHandle(hThread); + + return (hThread == NULL ? -1 : 0); +} + +static HANDLE +dlopen(const char *dll_name, int flags) +{ + wchar_t wbuf[FILENAME_MAX]; + + flags = 0; /* Unused */ + to_unicode(dll_name, wbuf, ARRAY_SIZE(wbuf)); + + return (LoadLibraryW(wbuf)); +} + +#if !defined(NO_CGI) +static int +kill(pid_t pid, int sig_num) +{ + (void) TerminateProcess(pid, sig_num); + (void) CloseHandle(pid); + return (0); +} + +static pid_t +spawn_process(struct mg_connection *conn, const char *prog, char *envblk, + char *envp[], int fd_stdin, int fd_stdout, const char *dir) +{ + HANDLE me; + char *p, *interp, cmdline[FILENAME_MAX], line[FILENAME_MAX]; + FILE *fp; + STARTUPINFOA si; + PROCESS_INFORMATION pi; + + envp = NULL; /* Unused */ + + (void) memset(&si, 0, sizeof(si)); + (void) memset(&pi, 0, sizeof(pi)); + + /* XXX redirect CGI errors to the error log file */ + si.cb = sizeof(si); + si.dwFlags = STARTF_USESTDHANDLES | STARTF_USESHOWWINDOW; + si.wShowWindow = SW_HIDE; + + me = GetCurrentProcess(); + (void) DuplicateHandle(me, (HANDLE) _get_osfhandle(fd_stdin), me, + &si.hStdInput, 0, TRUE, DUPLICATE_SAME_ACCESS); + (void) DuplicateHandle(me, (HANDLE) _get_osfhandle(fd_stdout), me, + &si.hStdOutput, 0, TRUE, DUPLICATE_SAME_ACCESS); + + /* If CGI file is a script, try to read the interpreter line */ + interp = conn->ctx->options[OPT_CGI_INTERPRETER]; + if (interp == NULL) { + line[2] = '\0'; + (void) mg_snprintf(conn, cmdline, sizeof(cmdline), "%s%c%s", + dir, DIRSEP, prog); + if ((fp = fopen(cmdline, "r")) != NULL) { + (void) fgets(line, sizeof(line), fp); + if (memcmp(line, "#!", 2) != 0) + line[2] = '\0'; + /* Trim whitespaces from interpreter name */ + for (p = &line[strlen(line) - 1]; p > line && + isspace(*p); p--) + *p = '\0'; + (void) fclose(fp); + } + interp = line + 2; + } + + if ((p = (char *) strrchr(prog, '/')) != NULL) + prog = p + 1; + + (void) mg_snprintf(conn, cmdline, sizeof(cmdline), "%s%s%s", + interp, interp[0] == '\0' ? "" : " ", prog); + + (void) mg_snprintf(conn, line, sizeof(line), "%s", dir); + fix_directory_separators(line); + + DEBUG_TRACE((DEBUG_MGS_PREFIX "%s: Running [%s]", __func__, cmdline)); + if (CreateProcessA(NULL, cmdline, NULL, NULL, TRUE, + CREATE_NEW_PROCESS_GROUP, envblk, line, &si, &pi) == 0) { + cry(conn, "%s: CreateProcess(%s): %d", + __func__, cmdline, ERRNO); + pi.hProcess = (pid_t) -1; + } else { + (void) close(fd_stdin); + (void) close(fd_stdout); + } + + (void) CloseHandle(si.hStdOutput); + (void) CloseHandle(si.hStdInput); + (void) CloseHandle(pi.hThread); + + return ((pid_t) pi.hProcess); +} + +static int +pipe(int *fds) +{ + return (_pipe(fds, BUFSIZ, _O_BINARY)); +} +#endif /* !NO_CGI */ + +static int +set_non_blocking_mode(struct mg_connection *conn, SOCKET sock) +{ + unsigned long on = 1; + + conn = NULL; /* unused */ + return (ioctlsocket(sock, FIONBIO, &on)); +} + +#else + +static int +mg_stat(const char *path, struct mgstat *stp) +{ + struct stat st; + int ok; + + if (stat(path, &st) == 0) { + ok = 0; + stp->size = st.st_size; + stp->mtime = st.st_mtime; + stp->is_directory = S_ISDIR(st.st_mode); + } else { + ok = -1; + } + + return (ok); +} + +static void +set_close_on_exec(int fd) +{ + (void) fcntl(fd, F_SETFD, FD_CLOEXEC); +} + +static int +start_thread(struct mg_context *ctx, mg_thread_func_t func, void *param) +{ + pthread_t thread_id; + pthread_attr_t attr; + int retval; + + (void) pthread_attr_init(&attr); + (void) pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED); + + if ((retval = pthread_create(&thread_id, &attr, func, param)) != 0) + cry(fc(ctx), "%s: %s", __func__, strerror(retval)); + + return (retval); +} + +#ifndef NO_CGI +static pid_t +spawn_process(struct mg_connection *conn, const char *prog, char *envblk, + char *envp[], int fd_stdin, int fd_stdout, const char *dir) +{ + pid_t pid; + const char *interp; + + envblk = NULL; /* unused */ + + if ((pid = fork()) == -1) { + /* Parent */ + send_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(fd_stdin, 0) == -1) { + cry(conn, "%s: dup2(stdin, %d): %s", + __func__, fd_stdin, strerror(ERRNO)); + } else if (dup2(fd_stdout, 1) == -1) { + cry(conn, "%s: dup2(stdout, %d): %s", + __func__, fd_stdout, strerror(ERRNO)); + } else { + /* If error file is specified, send errors there */ + if (conn->ctx->error_log != NULL) + (void) dup2(fileno(conn->ctx->error_log), 2); + + (void) close(fd_stdin); + (void) close(fd_stdout); + + /* Execute CGI program */ + interp = conn->ctx->options[OPT_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); + } else { + /* Parent. Close stdio descriptors */ + (void) close(fd_stdin); + (void) close(fd_stdout); + } + + return (pid); +} +#endif /* !NO_CGI */ + +static int +set_non_blocking_mode(struct mg_connection *conn, SOCKET sock) +{ + int flags, ok = -1; + + if ((flags = fcntl(sock, F_GETFL, 0)) == -1) { + cry(conn, "%s: fcntl(F_GETFL): %d", __func__, ERRNO); + } else if (fcntl(sock, F_SETFL, flags | O_NONBLOCK) != 0) { + cry(conn, "%s: fcntl(F_SETFL): %d", __func__, ERRNO); + } else { + ok = 0; /* Success */ + } + + return (ok); +} +#endif /* _WIN32 */ + +static void +lock_option(struct mg_context *ctx, int opt_index) +{ + if (pthread_mutex_lock(&ctx->opt_mutex[opt_index]) != 0) + cry(fc(ctx), "pthread_mutex_lock: %s", strerror(ERRNO)); +} + +static void +unlock_option(struct mg_context *ctx, int opt_index) +{ + if (pthread_mutex_unlock(&ctx->opt_mutex[opt_index]) != 0) + cry(fc(ctx), "pthread_mutex_unlock: %s", strerror(ERRNO)); +} + +/* + * 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; + + sent = 0; + while (sent < len) { + + /* How many bytes we send in this iteration */ + k = len - sent > INT_MAX ? INT_MAX : (int) (len - sent); + + if (ssl != NULL) { + n = SSL_write(ssl, buf + sent, k); + } else if (fp != NULL) { + n = fwrite(buf + sent, 1, k, fp); + if (ferror(fp)) + n = -1; + } else { + n = send(sock, buf + sent, k, 0); + } + + if (n < 0) + break; + + sent += n; + } + + return (sent); +} + +/* + * Read from IO channel - opened file descriptor, socket, or SSL descriptor. + * Return number of bytes read. + */ +static int +pull(FILE *fp, SOCKET sock, SSL *ssl, char *buf, int len) +{ + int nread; + + if (ssl != NULL) { + nread = SSL_read(ssl, buf, len); + } else if (fp != NULL) { + nread = fread(buf, 1, (size_t) len, fp); + if (ferror(fp)) + nread = -1; + } else { + nread = recv(sock, buf, (size_t) len, 0); + } + + return (nread); +} + +int +mg_write(struct mg_connection *conn, const void *buf, int len) +{ + assert(len >= 0); + return ((int) push(NULL, conn->client.sock, conn->ssl, + (const char *) buf, (int64_t) len)); +} + +int +mg_printf(struct mg_connection *conn, const char *fmt, ...) +{ + char buf[MAX_REQUEST_SIZE]; + int len; + va_list ap; + + va_start(ap, fmt); + len = mg_vsnprintf(conn, buf, sizeof(buf), fmt, ap); + va_end(ap); + + return (mg_write(conn, buf, len)); +} + +/* + * Return content length of the request, or -1 constant if + * Content-Length header is not set. + */ +static int64_t +get_content_length(const struct mg_connection *conn) +{ + const char *cl = mg_get_header(conn, "Content-Length"); + return (cl == NULL ? -1 : strtoll(cl, NULL, 10)); +} + +/* + * URL-decode input buffer into destination buffer. + * 0-terminate the destination buffer. Return the length of decoded data. + * 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 + */ +static size_t +url_decode(const char *src, size_t src_len, char *dst, size_t dst_len, + bool_t is_form_url_encoded) +{ + size_t i, j; + int 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] == '%' && + isxdigit(* (unsigned char *) (src + i + 1)) && + isxdigit(* (unsigned char *) (src + i + 2))) { + a = tolower(* (unsigned char *) (src + i + 1)); + b = tolower(* (unsigned char *) (src + i + 2)); + dst[j] = ((HEXTOI(a) << 4) | HEXTOI(b)) & 0xff; + 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 (j); +} + +/* + * Search for a form variable in a given buffer. + * Semantic is the same as for mg_get_var(). + */ +static char * +get_var(const char *name, const char *buf, size_t buf_len) +{ + const char *p, *e, *s; + char *val; + size_t var_len, len; + + var_len = strlen(name); + e = buf + buf_len; + val = NULL; + + /* buf is "var1=val1&var2=val2...". Find variable first */ + for (p = buf; p + var_len < e; p++) + if ((p == buf || p[-1] == '&') && p[var_len] == '=' && + !mg_strncasecmp(name, p, var_len)) { + + /* Point p to variable value */ + p += var_len + 1; + + /* Point s to the end of the value */ + s = (const char *) memchr(p, '&', e - p); + if (s == NULL) + s = e; + + /* Try to allocate the buffer */ + len = s - p; + if ((val = (char *) malloc(len + 1)) != NULL) + (void) url_decode(p, len, val, len + 1, TRUE); + break; + } + + return (val); +} + +/* + * Free the pointer returned by mg_get_var(). This is needed for languages + * like python, to have an ability to free allocated data without + * loading C runtime library and calling free(). + */ +void +mg_free(char *data) +{ + free(data); +} + +/* + * Return form data variable. + * It can be specified in query string, or in the POST data. + * Return NULL if the variable not found, or allocated 0-terminated value. + * It is caller's responsibility to free the returned value. + */ +char * +mg_get_var(const struct mg_connection *conn, const char *name) +{ + const struct mg_request_info *ri = &conn->request_info; + char *v1, *v2; + + v1 = v2 = NULL; + + /* Look in both query_string and POST data */ + if (ri->query_string != NULL) + v1 = get_var(name, ri->query_string, strlen(ri->query_string)); + if (ri->post_data_len > 0) + v2 = get_var(name, ri->post_data, ri->post_data_len); + + /* If they both have queried variable, POST data wins */ + if (v1 != NULL && v2 != NULL) + free(v1); + + return (v2 == NULL ? v1 : v2); +} + +/* + * Transform URI to the file name. + */ +static void +convert_uri_to_file_name(struct mg_connection *conn, const char *uri, + char *buf, size_t buf_len) +{ + struct mg_context *ctx = conn->ctx; + struct vec uri_vec, path_vec; + const char *list; + + lock_option(ctx, OPT_ROOT); + mg_snprintf(conn, buf, buf_len, "%s%s", ctx->options[OPT_ROOT], uri); + unlock_option(ctx, OPT_ROOT); + + /* If requested URI has aliased prefix, use alternate root */ + lock_option(ctx, OPT_ALIASES); + list = ctx->options[OPT_ALIASES]; + + while ((list = next_option(list, &uri_vec, &path_vec)) != NULL) { + if (memcmp(uri, uri_vec.ptr, uri_vec.len) == 0) { + (void) mg_snprintf(conn, buf, buf_len, "%.*s%s", + path_vec.len, path_vec.ptr, uri + uri_vec.len); + break; + } + } + unlock_option(ctx, OPT_ALIASES); + +#ifdef _WIN32 + fix_directory_separators(buf); +#endif /* _WIN32 */ + + DEBUG_TRACE((DEBUG_MGS_PREFIX "%s: [%s] -> [%s]", __func__, uri, buf)); +} + +/* + * Setup listening socket on given address, return socket. + * Address format: [local_ip_address:]port_number + */ +static SOCKET +mg_open_listening_port(struct mg_context *ctx, const char *str, struct usa *usa) +{ + SOCKET sock; + int on = 1, a, b, c, d, port; + + /* MacOS needs that. If we do not zero it, bind() will fail. */ + (void) memset(usa, 0, sizeof(*usa)); + + if (sscanf(str, "%d.%d.%d.%d:%d", &a, &b, &c, &d, &port) == 5) { + /* IP address to bind to is specified */ + usa->u.sin.sin_addr.s_addr = + htonl(((uint32_t)a << 24) | ((uint32_t)b << 16) | ((uint32_t)c << 8) | (uint32_t)d); + } else if (sscanf(str, "%d", &port) == 1) { + /* Only port number is specified. Bind to all addresses */ + usa->u.sin.sin_addr.s_addr = htonl(INADDR_ANY); + } else { + return (INVALID_SOCKET); + } + + usa->len = sizeof(usa->u.sin); + usa->u.sin.sin_family = AF_INET; + usa->u.sin.sin_port = htons((uint16_t) port); + + if ((sock = socket(PF_INET, SOCK_STREAM, 6)) != INVALID_SOCKET && + setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, + (char *) &on, sizeof(on)) == 0 && + bind(sock, &usa->u.sa, usa->len) == 0 && + listen(sock, 20) == 0) { + /* Success */ + set_close_on_exec(sock); + } else { + /* Error */ + cry(fc(ctx), "%s(%d): %s", __func__, port, strerror(ERRNO)); + if (sock != INVALID_SOCKET) + (void) closesocket(sock); + sock = INVALID_SOCKET; + } + + return (sock); +} + +/* + * 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, size_t 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(* (unsigned char *) s) && *s != '\r' && + *s != '\n' && * (unsigned char *) s < 128) + len = -1; + 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 +montoi(const char *s) +{ + size_t i; + + for (i = 0; i < sizeof(month_names) / sizeof(month_names[0]); i++) + if (!strcmp(s, month_names[i])) + return ((int) i); + + return (-1); +} + +/* + * Parse date-time string, and return the corresponding time_t value + */ +static time_t +date_to_epoch(const char *s) +{ + time_t current_time; + struct tm tm, *tmp; + char mon[32]; + int sec, min, hour, mday, month, year; + + (void) memset(&tm, 0, sizeof(tm)); + sec = min = hour = mday = month = year = 0; + + if (((sscanf(s, "%d/%3s/%d %d:%d:%d", + &mday, mon, &year, &hour, &min, &sec) == 6) || + (sscanf(s, "%d %3s %d %d:%d:%d", + &mday, mon, &year, &hour, &min, &sec) == 6) || + (sscanf(s, "%*3s, %d %3s %d %d:%d:%d", + &mday, mon, &year, &hour, &min, &sec) == 6) || + (sscanf(s, "%d-%3s-%d %d:%d:%d", + &mday, mon, &year, &hour, &min, &sec) == 6)) && + (month = montoi(mon)) != -1) { + tm.tm_mday = mday; + tm.tm_mon = month; + tm.tm_year = year; + tm.tm_hour = hour; + tm.tm_min = min; + tm.tm_sec = sec; + } + + if (tm.tm_year > 1900) + tm.tm_year -= 1900; + else if (tm.tm_year < 70) + tm.tm_year += 100; + + /* Set Daylight Saving Time field */ + current_time = time(NULL); + tmp = localtime(¤t_time); + tm.tm_isdst = tmp->tm_isdst; + + return (mktime(&tm)); +} + +/* + * 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 and backslashes */ + while (*s == '/' || *s == '\\') + s++; + + /* Skip all double-dots */ + while (*s == '.' && s[1] == '.') + s += 2; + } + } + *p = '\0'; +} + +/* + * Built-in mime types + */ +static const struct { + const char *extension; + size_t ext_len; + const char *mime_type; + size_t mime_type_len; +} mime_types[] = { + {".html", 5, "text/html", 9}, + {".htm", 4, "text/html", 9}, + {".shtm", 5, "text/html", 9}, + {".shtml", 6, "text/html", 9}, + {".css", 4, "text/css", 8}, + {".js", 3, "application/x-javascript", 24}, + {".ico", 4, "image/x-icon", 12}, + {".gif", 4, "image/gif", 9}, + {".jpg", 4, "image/jpeg", 10}, + {".jpeg", 5, "image/jpeg", 10}, + {".png", 4, "image/png", 9}, + {".svg", 4, "image/svg+xml", 13}, + {".torrent", 8, "application/x-bittorrent", 24}, + {".wav", 4, "audio/x-wav", 11}, + {".mp3", 4, "audio/x-mp3", 11}, + {".mid", 4, "audio/mid", 9}, + {".m3u", 4, "audio/x-mpegurl", 15}, + {".ram", 4, "audio/x-pn-realaudio", 20}, + {".xml", 4, "text/xml", 8}, + {".xslt", 5, "application/xml", 15}, + {".ra", 3, "audio/x-pn-realaudio", 20}, + {".doc", 4, "application/msword", 19}, + {".exe", 4, "application/octet-stream", 24}, + {".zip", 4, "application/x-zip-compressed", 28}, + {".xls", 4, "application/excel", 17}, + {".tgz", 4, "application/x-tar-gz", 20}, + {".tar", 4, "application/x-tar", 17}, + {".gz", 3, "application/x-gunzip", 20}, + {".arj", 4, "application/x-arj-compressed", 28}, + {".rar", 4, "application/x-arj-compressed", 28}, + {".rtf", 4, "application/rtf", 15}, + {".pdf", 4, "application/pdf", 15}, + {".swf", 4, "application/x-shockwave-flash",29}, + {".mpg", 4, "video/mpeg", 10}, + {".mpeg", 5, "video/mpeg", 10}, + {".asf", 4, "video/x-ms-asf", 14}, + {".avi", 4, "video/x-msvideo", 15}, + {".bmp", 4, "image/bmp", 9}, + {NULL, 0, NULL, 0} +}; + +/* + * 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 i, path_len; + + path_len = strlen(path); + + /* + * Scan user-defined mime types first, in case user wants to + * override default mime types. + */ + lock_option(ctx, OPT_MIME_TYPES); + list = ctx->options[OPT_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; + unlock_option(ctx, OPT_MIME_TYPES); + return; + } + } + unlock_option(ctx, OPT_MIME_TYPES); + + /* Now scan built-in mime types */ + for (i = 0; mime_types[i].extension != NULL; i++) { + ext = path + (path_len - mime_types[i].ext_len); + if (path_len > mime_types[i].ext_len && + mg_strcasecmp(ext, mime_types[i].extension) == 0) { + vec->ptr = mime_types[i].mime_type; + vec->len = mime_types[i].mime_type_len; + return; + } + } + + /* Nothing found. Fall back to text/plain */ + vec->ptr = "text/plain"; + vec->len = 10; +} + +#ifndef HAVE_MD5 +typedef struct MD5Context { + uint32_t buf[4]; + uint32_t bits[2]; + unsigned char in[64]; +} MD5_CTX; + +#if __BYTE_ORDER == 1234 +#define byteReverse(buf, len) /* Nothing */ +#else +/* + * Note: this code is harmless on little-endian machines. + */ +static void +byteReverse(unsigned char *buf, unsigned longs) +{ + uint32_t t; + 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); +} +#endif /* __BYTE_ORDER */ + +/* The four core functions - F1 is optimized somewhat */ + +/* #define F1(x, y, z) (x & y | ~x & z) */ +#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)) + +/* This is the central step in the MD5 algorithm. */ +#define MD5STEP(f, w, x, y, z, data, s) \ +( w += f(x, y, z) + data, w = w<<s | 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; +} + +/* + * The core of the MD5 algorithm, this alters an existing MD5 hash to + * reflect the addition of 16 longwords of new data. MD5Update blocks + * the data and converts bytes into longwords for this routine. + */ +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; +} + +/* + * Update context to reflect the concatenation of another buffer full + * of bytes. + */ +static void +MD5Update(MD5_CTX *ctx, unsigned char const *buf, uint32_t len) +{ + uint32_t t; + + /* Update bitcount */ + + t = ctx->bits[0]; + if ((ctx->bits[0] = t + (len << 3)) < t) + ctx->bits[1]++; /* Carry from low to high */ + ctx->bits[1] += len >> 29; + + t = (t >> 3) & 0x3f; /* Bytes already in shsInfo->data */ + + /* Handle any leading odd-sized chunks */ + + 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; + } + /* Process data in 64-byte chunks */ + + while (len >= 64) { + memcpy(ctx->in, buf, 64); + byteReverse(ctx->in, 16); + MD5Transform(ctx->buf, (uint32_t *) ctx->in); + buf += 64; + len -= 64; + } + + /* Handle any remaining bytes of data. */ + + memcpy(ctx->in, buf, len); +} + +/* + * Final wrapup - pad to 64-byte boundary with the bit pattern + * 1 0* (64-bit count of bits processed, MSB-first) + */ +static void +MD5Final(unsigned char digest[16], MD5_CTX *ctx) +{ + unsigned count; + unsigned char *p; + + /* Compute number of bytes mod 64 */ + count = (ctx->bits[0] >> 3) & 0x3F; + + /* Set the first char of padding to 0x80. This is safe since there is + always at least one byte free */ + p = ctx->in + count; + *p++ = 0x80; + + /* Bytes of padding needed to make 64 bytes */ + count = 64 - 1 - count; + + /* Pad out to 56 mod 64 */ + if (count < 8) { + /* Two lots of padding: Pad the first block to 64 bytes */ + memset(p, 0, count); + byteReverse(ctx->in, 16); + MD5Transform(ctx->buf, (uint32_t *) ctx->in); + + /* Now fill the next block with 56 bytes */ + memset(ctx->in, 0, 56); + } else { + /* Pad block to 56 bytes */ + memset(p, 0, count - 8); + } + byteReverse(ctx->in, 14); + + /* Append length in bits and transform */ + ((uint32_t *) ctx->in)[14] = ctx->bits[0]; + ((uint32_t *) ctx->in)[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)); /* In case it's sensitive */ +} +#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 vectors. + * buf must point to 33-bytes long buffer + */ +static void +mg_md5(char *buf, ...) +{ + 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, (unsigned char *) p, strlen(p)); + va_end(ap); + + MD5Final(hash, &ctx); + bin2str(buf, hash, sizeof(hash)); +} + +/* + * Check the user's password, return 1 if OK + */ +static bool_t +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]; + + /* XXX Due to a bug in MSIE, we do not compare the URI */ + /* Also, we do not check for authentication timeout */ + if (/*strcmp(dig->uri, c->ouri) != 0 || */ + strlen(response) != 32 /*|| + now - strtoul(dig->nonce, NULL, 10) > 3600 */) + return (FALSE); + + mg_md5(ha2, method, ":", uri, NULL); + mg_md5(expected_response, ha1, ":", nonce, ":", nc, + ":", cnonce, ":", qop, ":", ha2, NULL); + + return (!mg_strcasecmp(response, expected_response)); +} + +/* + * Use the global passwords file, if specified by auth_gpass option, + * or search for .htpasswd in the requested directory. + */ +static FILE * +open_auth_file(struct mg_connection *conn, const char *path) +{ + struct mg_context *ctx = conn->ctx; + char name[FILENAME_MAX]; + const char *p, *e; + struct mgstat st; + FILE *fp; + + if (ctx->options[OPT_AUTH_GPASSWD] != NULL) { + /* Use global passwords file */ + fp = mg_fopen(ctx->options[OPT_AUTH_GPASSWD], "r"); + if (fp == NULL) + cry(fc(ctx), "fopen(%s): %s", + ctx->options[OPT_AUTH_GPASSWD], strerror(ERRNO)); + } else if (!mg_stat(path, &st) && st.is_directory) { + (void) mg_snprintf(conn, name, sizeof(name), "%s%c%s", + path, DIRSEP, PASSWORDS_FILE_NAME); + fp = mg_fopen(name, "r"); + } else { + /* + * Try to find .htpasswd in requested directory. + * Given the path, create the path to .htpasswd file + * in the same directory. Find the right-most + * directory separator character first. That would be the + * directory name. If directory separator character is not + * found, 'e' will point to 'p'. + */ + for (p = path, e = p + strlen(p) - 1; e > p; e--) + if (IS_DIRSEP_CHAR(*e)) + break; + + /* + * Make up the path by concatenating directory name and + * .htpasswd file name. + */ + (void) mg_snprintf(conn, name, sizeof(name), "%.*s%c%s", + (int) (e - p), p, DIRSEP, PASSWORDS_FILE_NAME); + fp = mg_fopen(name, "r"); + } + + return (fp); +} + +/* + * Parsed Authorization: header + */ +struct ah { + char *user, *uri, *cnonce, *response, *qop, *nc, *nonce; +}; + +static bool_t +parse_auth_header(struct mg_connection *conn, char *buf, size_t buf_size, + struct ah *ah) +{ + char *name, *value, *s; + const char *auth_header; + + if ((auth_header = mg_get_header(conn, "Authorization")) == NULL || + mg_strncasecmp(auth_header, "Digest ", 7) != 0) + return (FALSE); + + /* Make modifiable copy of the auth header */ + (void) mg_strlcpy(buf, auth_header + 7, buf_size); + + s = buf; + (void) memset(ah, 0, sizeof(*ah)); + + /* Gobble initial spaces */ + while (isspace(* (unsigned char *) s)) + s++; + + /* Parse authorization header */ + for (;;) { + name = skip(&s, "="); + value = skip(&s, ", "); + + if (*value == '"') { + value++; + value[strlen(value) - 1] = '\0'; + } else if (*value == '\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); + + return (TRUE); +} + +/* + * Authorize against the opened passwords file. Return 1 if authorized. + */ +static bool_t +authorize(struct mg_connection *conn, FILE *fp) +{ + struct ah ah; + char line[256], f_user[256], domain[256], ha1[256], + buf[MAX_REQUEST_SIZE]; + + if (!parse_auth_header(conn, buf, sizeof(buf), &ah)) + return (FALSE); + + /* Loop over passwords file */ + while (fgets(line, sizeof(line), fp) != NULL) { + + if (sscanf(line, "%[^:]:%[^:]:%s", f_user, domain, ha1) != 3) + continue; + + if (!strcmp(ah.user, f_user) && + !strcmp(domain, conn->ctx->options[OPT_AUTH_DOMAIN])) + return (check_password( + conn->request_info.request_method, ha1, + ah.uri, ah.nonce, ah.nc, ah.cnonce, + ah.qop, ah.response)); + } + + return (FALSE); +} + +/* + * Return TRUE if request is authorised, FALSE otherwise. + */ +static bool_t +check_authorization(struct mg_connection *conn, const char *path) +{ + FILE *fp; + char fname[FILENAME_MAX]; + struct vec uri_vec, filename_vec; + const char *list; + bool_t authorized; + + fp = NULL; + authorized = TRUE; + + lock_option(conn->ctx, OPT_PROTECT); + list = conn->ctx->options[OPT_PROTECT]; + while ((list = next_option(list, &uri_vec, &filename_vec)) != NULL) { + if (!memcmp(conn->request_info.uri, uri_vec.ptr, uri_vec.len)) { + (void) mg_snprintf(conn, fname, sizeof(fname), "%.*s", + filename_vec.len, filename_vec.ptr); + if ((fp = mg_fopen(fname, "r")) == NULL) + cry(conn, "%s: cannot open %s: %s", + __func__, fname, strerror(errno)); + break; + } + } + unlock_option(conn->ctx, OPT_PROTECT); + + if (fp == NULL) + fp = open_auth_file(conn, path); + + if (fp != NULL) { + authorized = authorize(conn, fp); + (void) fclose(fp); + } + + return (authorized); +} + +static void +send_authorization_request(struct mg_connection *conn) +{ + conn->request_info.status_code = 401; + (void) mg_printf(conn, + "HTTP/1.1 401 Unauthorized\r\n" + "WWW-Authenticate: Digest qop=\"auth\", " + "realm=\"%s\", nonce=\"%lu\"\r\n\r\n", + conn->ctx->options[OPT_AUTH_DOMAIN], (unsigned long) time(NULL)); +} + +static bool_t +is_authorized_for_put(struct mg_connection *conn) +{ + FILE *fp; + int ret = FALSE; + + if ((fp = mg_fopen(conn->ctx->options[OPT_AUTH_PUT], "r")) != NULL) { + set_close_on_exec(fileno(fp)); + ret = authorize(conn, fp); + (void) fclose(fp); + } + + return (ret); +} + +int +mg_modify_passwords_file(struct mg_context *ctx, const char *fname, + const char *user, const char *pass) +{ + int found; + char line[512], u[512], d[512], ha1[33], tmp[FILENAME_MAX]; + const char *domain; + FILE *fp, *fp2; + + found = 0; + fp = fp2 = NULL; + domain = ctx->options[OPT_AUTH_DOMAIN]; + + /* Regard empty password as no password - remove user record. */ + if (pass[0] == '\0') + pass = NULL; + + (void) snprintf(tmp, sizeof(tmp), "%s.tmp", fname); + + /* Create the file if does not exist */ + if ((fp = mg_fopen(fname, "a+")) != NULL) + (void) fclose(fp); + + /* Open the given file and temporary file */ + if ((fp = mg_fopen(fname, "r")) == NULL) { + cry(fc(ctx), "Cannot open %s: %s", fname, strerror(errno)); + return (0); + } else if ((fp2 = mg_fopen(tmp, "w+")) == NULL) { + cry(fc(ctx), "Cannot open %s: %s", tmp, strerror(errno)); + 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 { + (void) fprintf(fp2, "%s", line); + } + } + + /* If new user, just add it */ + if (!found && pass != NULL) { + mg_md5(ha1, user, ":", domain, ":", pass, NULL); + (void) fprintf(fp2, "%s:%s:%s\n", user, domain, ha1); + } + + /* Close files */ + (void) fclose(fp); + (void) fclose(fp2); + + /* Put the temp file in place of real file */ + (void) mg_remove(fname); + (void) mg_rename(tmp, fname); + + return (0); +} + +struct de { + struct mg_connection *conn; + char *file_name; + struct mgstat st; +}; + +static void +url_encode(const char *src, char *dst, size_t dst_len) +{ + const char *dont_escape = "._-$,;~()"; + const char *hex = "0123456789abcdef"; + const char *end = dst + dst_len - 1; + + for (; *src != '\0' && dst < end; src++, dst++) { + if (isalnum(*(unsigned char *) src) || + strchr(dont_escape, * (unsigned char *) src) != NULL) { + *dst = *src; + } else if (dst + 2 < end) { + dst[0] = '%'; + dst[1] = hex[(* (unsigned char *) src) >> 4]; + dst[2] = hex[(* (unsigned char *) src) & 0xf]; + dst += 2; + } + } + + *dst = '\0'; +} + +/* + * This function is called from send_directory() and prints out + * single directory entry. + */ +static void +print_dir_entry(struct de *de) +{ + char size[64], mod[64], href[FILENAME_MAX]; + + if (de->st.is_directory) { + (void) 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->st.size < 1024) + (void) mg_snprintf(de->conn, size, sizeof(size), + "%lu", (unsigned long) de->st.size); + else if (de->st.size < 0x100000 /* 1024 * 1024 */) + (void) mg_snprintf(de->conn, size, sizeof(size), + "%.1fk", (double) de->st.size / 1024.0); + else if (de->st.size < 0x40000000 /* 1024 * 1024 * 1024 */) + (void) mg_snprintf(de->conn, size, sizeof(size), + "%.1fM", (double) de->st.size / 1048576); + else + (void) mg_snprintf(de->conn, size, sizeof(size), + "%.1fG", (double) de->st.size / 1073741824); + } + (void) strftime(mod, sizeof(mod), "%d-%b-%Y %H:%M", + localtime(&de->st.mtime)); + + url_encode(de->file_name, href, sizeof(href)); + + de->conn->num_bytes_sent += mg_printf(de->conn, + "<tr><td><a href=\"%s%s%s\">%s%s</a></td>" + "<td> %s</td><td> %s</td></tr>\n", + de->conn->request_info.uri, href, de->st.is_directory ? "/" : "", + de->file_name, de->st.is_directory ? "/" : "", mod, size); +} + +/* + * This function is called from send_directory() and used for + * sorting direcotory entries by size, or name, or modification time. + */ +static int +compare_dir_entries(const void *p1, const void *p2) +{ + const struct de *a = (struct de *) p1, *b = (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->st.is_directory && !b->st.is_directory) { + return (-1); /* Always put directories on top */ + } else if (!a->st.is_directory && b->st.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->st.size == b->st.size ? 0 : + a->st.size > b->st.size ? 1 : -1; + } else if (*query_string == 'd') { + cmp_result = a->st.mtime == b->st.mtime ? 0 : + a->st.mtime > b->st.mtime ? 1 : -1; + } + + return (query_string[1] == 'd' ? -cmp_result : cmp_result); +} + +/* + * Send directory contents. + */ +static void +send_directory(struct mg_connection *conn, const char *dir) +{ + struct dirent *dp; + DIR *dirp; + struct de *entries = NULL; + char path[FILENAME_MAX]; + int i, sort_direction, num_entries = 0, arr_size = 128; + + if ((dirp = opendir(dir)) == NULL) { + send_error(conn, 500, "Cannot open directory", + "Error: opendir(%s): %s", path, strerror(ERRNO)); + return; + } + + (void) 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"); + + sort_direction = conn->request_info.query_string != NULL && + conn->request_info.query_string[1] == 'd' ? 'a' : 'd'; + + while ((dp = readdir(dirp)) != NULL) { + + /* Do not show current dir and passwords file */ + if (!strcmp(dp->d_name, ".") || + !strcmp(dp->d_name, "..") || + !strcmp(dp->d_name, PASSWORDS_FILE_NAME)) + continue; + + if (entries == NULL || num_entries >= arr_size) { + arr_size *= 2; + entries = (struct de *) realloc(entries, + arr_size * sizeof(entries[0])); + } + + if (entries == NULL) { + send_error(conn, 500, "Cannot open directory", + "%s", "Error: cannot allocate memory"); + return; + } + + (void) mg_snprintf(conn, path, sizeof(path), "%s%c%s", + dir, DIRSEP, 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 + */ + if (mg_stat(path, &entries[num_entries].st) != 0) + (void) memset(&entries[num_entries].st, 0, + sizeof(entries[num_entries].st)); + + entries[num_entries].conn = conn; + entries[num_entries].file_name = mg_strdup(dp->d_name); + num_entries++; + } + (void) closedir(dirp); + + conn->num_bytes_sent += mg_printf(conn, + "<html><head><title>Index of %s</title>" + "<style>th {text-align: left;}</style></head>" + "<body><h1>Index of %s</h1><pre><table cellpadding=\"0\">" + "<tr><th><a href=\"?n%c\">Name</a></th>" + "<th><a href=\"?d%c\">Modified</a></th>" + "<th><a href=\"?s%c\">Size</a></th></tr>" + "<tr><td colspan=\"3\"><hr></td></tr>", + 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, + "<tr><td><a href=\"%s%s\">%s</a></td>" + "<td> %s</td><td> %s</td></tr>\n", + conn->request_info.uri, "..", "Parent directory", "-", "-"); + + /* Sort and print directory entries */ + qsort(entries, num_entries, sizeof(entries[0]), compare_dir_entries); + for (i = 0; i < num_entries; i++) { + print_dir_entry(&entries[i]); + free(entries[i].file_name); + } + free(entries); + + conn->num_bytes_sent += mg_printf(conn, "%s", "</table></body></html>"); + conn->request_info.status_code = 200; +} + +/* + * Send len bytes from the opened file to the client. + */ +static void +send_opened_file_stream(struct mg_connection *conn, FILE *fp, int64_t len) +{ + char buf[BUFSIZ]; + int to_read, num_read, num_written; + + 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, to_read, fp)) == 0) + break; + + /* Send read bytes to the client, exit the loop on error */ + if ((num_written = mg_write(conn, buf, num_read)) != num_read) + break; + + /* Both read and were successful, adjust counters */ + conn->num_bytes_sent += num_written; + len -= num_written; + } +} + +/* + * Send regular file contents. + */ +static void +send_file(struct mg_connection *conn, const char *path, struct mgstat *stp) +{ + char date[64], lm[64], etag[64], range[64]; + const char *fmt = "%a, %d %b %Y %H:%M:%S %Z", *msg = "OK", *hdr; + time_t curtime = time(NULL); + int64_t cl, r1, r2; + struct vec mime_vec; + FILE *fp; + int n; + + get_mime_type(conn->ctx, path, &mime_vec); + cl = stp->size; + conn->request_info.status_code = 200; + range[0] = '\0'; + + if ((fp = mg_fopen(path, "rb")) == NULL) { + send_error(conn, 500, http_500_error, + "fopen(%s): %s", path, strerror(ERRNO)); + return; + } + set_close_on_exec(fileno(fp)); + + /* If Range: header specified, act accordingly */ + r1 = r2 = 0; + hdr = mg_get_header(conn, "Range"); + if (hdr != NULL && (n = sscanf(hdr, + "bytes=%" INT64_FMT "-%" INT64_FMT, &r1, &r2)) > 0) { + conn->request_info.status_code = 206; + (void) fseeko(fp, (off_t) r1, SEEK_SET); + cl = n == 2 ? r2 - r1 + 1: cl - r1; + (void) mg_snprintf(conn, range, sizeof(range), + "Content-Range: bytes " + "%" INT64_FMT "-%" + INT64_FMT "/%" INT64_FMT "\r\n", + r1, r1 + cl - 1, stp->size); + msg = "Partial Content"; + } + + /* Prepare Etag, Date, Last-Modified headers */ + (void) strftime(date, sizeof(date), fmt, localtime(&curtime)); + (void) strftime(lm, sizeof(lm), fmt, localtime(&stp->mtime)); + (void) mg_snprintf(conn, etag, sizeof(etag), "%lx.%lx", + (unsigned long) stp->mtime, (unsigned long) stp->size); + + (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: close\r\n" + "Accept-Ranges: bytes\r\n" + "%s\r\n", + conn->request_info.status_code, msg, date, lm, etag, + mime_vec.len, mime_vec.ptr, cl, range); + + if (strcmp(conn->request_info.request_method, "HEAD") != 0) + send_opened_file_stream(conn, fp, cl); + (void) fclose(fp); +} + +/* + * 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(buf, ": "); + ri->http_headers[i].value = skip(buf, "\r\n"); + if (ri->http_headers[i].name[0] == '\0') + break; + ri->num_headers = i + 1; + } +} + +static bool_t +is_valid_http_method(const char *method) +{ + return (!strcmp(method, "GET") || + !strcmp(method, "POST") || + !strcmp(method, "HEAD") || + !strcmp(method, "PUT") || + !strcmp(method, "DELETE")); +} + +/* + * Parse HTTP request, fill in mg_request_info structure. + */ +static bool_t +parse_http_request(char *buf, struct mg_request_info *ri, const struct usa *usa) +{ + int success_code = FALSE; + + ri->request_method = skip(&buf, " "); + ri->uri = skip(&buf, " "); + ri->http_version = skip(&buf, "\r\n"); + + if (is_valid_http_method(ri->request_method) && + ri->uri[0] == '/' && + strncmp(ri->http_version, "HTTP/", 5) == 0) { + ri->http_version += 5; /* Skip "HTTP/" */ + parse_http_headers(&buf, ri); + ri->remote_port = ntohs(usa->u.sin.sin_port); + (void) memcpy(&ri->remote_ip, &usa->u.sin.sin_addr.s_addr, 4); + ri->remote_ip = ntohl(ri->remote_ip); + success_code = TRUE; + } + + return (success_code); +} + +/* + * 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, SOCKET sock, SSL *ssl, char *buf, int bufsiz, int *nread) +{ + int n, request_len; + + request_len = 0; + while (*nread < bufsiz && request_len == 0) { + n = pull(fp, sock, ssl, buf + *nread, bufsiz - *nread); + if (n <= 0) { + break; + } else { + *nread += n; + request_len = get_request_len(buf, (size_t) *nread); + } + } + + return (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 bool_t +substitute_index_file(struct mg_connection *conn, + char *path, size_t path_len, struct mgstat *stp) +{ + const char *list; + struct mgstat st; + struct vec filename_vec; + size_t n; + bool_t found; + + n = strlen(path); + + /* + * 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 && IS_DIRSEP_CHAR(path[n - 1])) + n--; + path[n] = DIRSEP; + + /* + * 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 + */ + lock_option(conn->ctx, OPT_INDEX_FILES); + list = conn->ctx->options[OPT_INDEX_FILES]; + found = FALSE; + + 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) + continue; + + /* Prepare full path to the index file */ + (void) mg_strlcpy(path + n + 1, + filename_vec.ptr, filename_vec.len + 1); + + /* Does it exist ? */ + if (mg_stat(path, &st) == 0) { + /* Yes it does, break the loop */ + *stp = st; + found = TRUE; + break; + } + } + unlock_option(conn->ctx, OPT_INDEX_FILES); + + /* If no index file exists, restore directory path */ + if (found == FALSE) + path[n] = '\0'; + + return (found); +} + +static void +remove_callback(struct mg_context *ctx, + const char *uri_regex, int status_code, bool_t is_auth) +{ + struct callback *cb; + int i; + + for (i = 0; i < ctx->num_callbacks; i++) { + cb = ctx->callbacks + i; + if ((uri_regex != NULL && cb->uri_regex != NULL && + ((is_auth && cb->is_auth) || (!is_auth && !cb->is_auth)) && + !strcmp(uri_regex, cb->uri_regex)) || (uri_regex == NULL && + (cb->status_code == 0 || + cb->status_code == status_code))) { + (void) memmove(cb, cb + 1, + (char *) (ctx->callbacks + ctx->num_callbacks) - + (char *) (cb + 1)); + break; + } + } +} + +static void +add_callback(struct mg_context *ctx, const char *uri_regex, int status_code, + mg_callback_t func, bool_t is_auth, void *user_data) +{ + struct callback *cb; + + pthread_mutex_lock(&ctx->bind_mutex); + if (func == NULL) { + remove_callback(ctx, uri_regex, status_code, is_auth); + } else if (ctx->num_callbacks >= (int) ARRAY_SIZE(ctx->callbacks) - 1) { + cry(fc(ctx), "Too many callbacks! Increase MAX_CALLBACKS."); + } else { + cb = &ctx->callbacks[ctx->num_callbacks]; + cb->uri_regex = uri_regex ? mg_strdup(uri_regex) : NULL; + cb->func = func; + cb->is_auth = is_auth; + cb->status_code = status_code; + cb->user_data = user_data; + ctx->num_callbacks++; + DEBUG_TRACE((DEBUG_MGS_PREFIX "%s: uri %s code %d", + __func__, uri_regex ? uri_regex : "NULL", status_code)); + } + pthread_mutex_unlock(&ctx->bind_mutex); +} + +void +mg_set_uri_callback(struct mg_context *ctx, const char *uri_regex, + mg_callback_t func, void *user_data) +{ + assert(uri_regex != NULL); + add_callback(ctx, uri_regex, -1, func, FALSE, user_data); +} + +void +mg_set_error_callback(struct mg_context *ctx, int error_code, + mg_callback_t func, void *user_data) +{ + assert(error_code >= 0 && error_code < 1000); + add_callback(ctx, NULL, error_code, func, FALSE, user_data); +} + +void +mg_set_auth_callback(struct mg_context *ctx, const char *uri_regex, + mg_callback_t func, void *user_data) +{ + assert(uri_regex != NULL); + add_callback(ctx, uri_regex, -1, func, TRUE, user_data); +} + +/* + * Return True if we should reply 304 Not Modified. + */ +static bool_t +is_not_modified(const struct mg_connection *conn, const struct mgstat *stp) +{ + const char *ims = mg_get_header(conn, "If-Modified-Since"); + return (ims != NULL && stp->mtime < date_to_epoch(ims)); +} + +static bool_t +append_chunk(struct mg_request_info *ri, FILE *fp, const char *buf, int len) +{ + bool_t ret_code = TRUE; + + if (fp == NULL) { + /* TODO: check for NULL here */ + ri->post_data = (char *) realloc(ri->post_data, + ri->post_data_len + len); + (void) memcpy(ri->post_data + ri->post_data_len, buf, len); + ri->post_data_len += len; + } else if (push(fp, INVALID_SOCKET, + NULL, buf, (int64_t) len) != (int64_t) len) { + ret_code = FALSE; + } + + return (ret_code); +} + +static bool_t +handle_request_body(struct mg_connection *conn, FILE *fp) +{ + struct mg_request_info *ri = &conn->request_info; + const char *expect, *tmp; + int64_t content_len; + char buf[BUFSIZ]; + int to_read, nread, already_read; + bool_t success_code = FALSE; + + content_len = get_content_length(conn); + expect = mg_get_header(conn, "Expect"); + + if (content_len == -1) { + send_error(conn, 411, "Length Required", ""); + } else if (expect != NULL && mg_strcasecmp(expect, "100-continue")) { + send_error(conn, 417, "Expectation Failed", ""); + } else { + if (expect != NULL) + (void) mg_printf(conn, "HTTP/1.1 100 Continue\r\n\r\n"); + + already_read = ri->post_data_len; + assert(already_read >= 0); + + if (content_len <= (int64_t) already_read) { + ri->post_data_len = (int) content_len; + /* + * If fp is NULL, this is embedded mode, and we do not + * have to do anything: POST data is already there, + * no need to allocate a buffer and copy it in. + * If fp != NULL, we need to write the data. + */ + success_code = fp == NULL || (push(fp, INVALID_SOCKET, + NULL, ri->post_data, content_len) == content_len) ? + TRUE : FALSE; + } else { + + if (fp == NULL) { + conn->free_post_data = TRUE; + tmp = ri->post_data; + /* +1 in case if already_read == 0 */ + ri->post_data = (char*)malloc(already_read + 1); + (void) memcpy(ri->post_data, tmp, already_read); + } else { + (void) push(fp, INVALID_SOCKET, NULL, + ri->post_data, (int64_t) already_read); + } + + content_len -= already_read; + + while (content_len > 0) { + to_read = sizeof(buf); + if ((int64_t) to_read > content_len) + to_read = (int) content_len; + nread = pull(NULL, conn->client.sock, + conn->ssl, buf, to_read); + if (nread <= 0) + break; + if (!append_chunk(ri, fp, buf, nread)) + break; + content_len -= nread; + } + success_code = content_len == 0 ? TRUE : FALSE; + } + + /* Each error code path in this function must send an error */ + if (success_code != TRUE) + send_error(conn, 577, http_500_error, + "%s", "Error handling body data"); + } + + return (success_code); +} + +#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 */ +}; + +/* + * 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 < space && + block->nvars < (int) ARRAY_SIZE(block->vars) - 2) { + /* Append a pointer to the added string into the envp array */ + block->vars[block->nvars++] = block->buf + block->len; + /* Bump up used length counter. Include \0 terminator */ + block->len += n + 1; + } + + return (added); +} + +static void +prepare_cgi_environment(struct mg_connection *conn, const char *prog, + struct cgi_env_block *blk) +{ + const char *s, *script_filename, *root, *slash; + struct vec var_vec; + char *p; + int i; + + blk->len = blk->nvars = 0; + blk->conn = conn; + + /* SCRIPT_FILENAME */ + script_filename = prog; + if ((s = strrchr(prog, '/')) != NULL) + script_filename = s + 1; + + lock_option(conn->ctx, OPT_ROOT); + root = conn->ctx->options[OPT_ROOT]; + addenv(blk, "SERVER_NAME=%s", conn->ctx->options[OPT_AUTH_DOMAIN]); + unlock_option(conn->ctx, OPT_ROOT); + + /* 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"); /* PHP */ + addenv(blk, "SERVER_PORT=%d", ntohs(conn->client.lsa.u.sin.sin_port)); + addenv(blk, "SERVER_ROOT=%s", root); + addenv(blk, "DOCUMENT_ROOT=%s", root); + addenv(blk, "REQUEST_METHOD=%s", conn->request_info.request_method); + addenv(blk, "REMOTE_ADDR=%s", + inet_ntoa(conn->client.rsa.u.sin.sin_addr)); + addenv(blk, "REMOTE_PORT=%d", conn->request_info.remote_port); + addenv(blk, "REQUEST_URI=%s", conn->request_info.uri); + + slash = strrchr(conn->request_info.uri, '/'); + addenv(blk, "SCRIPT_NAME=%.*s%s", + (slash - conn->request_info.uri) + 1, conn->request_info.uri, + script_filename); + + addenv(blk, "SCRIPT_FILENAME=%s", script_filename); /* PHP */ + 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 defined(_WIN32) + if ((s = getenv("COMSPEC")) != NULL) + addenv(blk, "COMSPEC=%s", s); + if ((s = getenv("SYSTEMROOT")) != NULL) + addenv(blk, "SYSTEMROOT=%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 */ + lock_option(conn->ctx, OPT_CGI_ENV); + s = conn->ctx->options[OPT_CGI_ENV]; + while ((s = next_option(s, &var_vec, NULL)) != NULL) + addenv(blk, "%.*s", var_vec.len, var_vec.ptr); + unlock_option(conn->ctx, OPT_CGI_ENV); + + 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 +send_cgi(struct mg_connection *conn, const char *prog) +{ + int headers_len, data_len, i; + const char *status; + char buf[MAX_REQUEST_SIZE], *pbuf; + struct mg_request_info ri; + struct cgi_env_block blk; + char dir[FILENAME_MAX], *p; + int fd_stdin[2], fd_stdout[2]; + FILE *in, *out; + pid_t pid; + + prepare_cgi_environment(conn, prog, &blk); + + /* CGI must be executed in its own directory */ + (void) mg_snprintf(conn, dir, sizeof(dir), "%s", prog); + if ((p = strrchr(dir, DIRSEP)) != NULL) + *p++ = '\0'; + + pid = (pid_t) -1; + fd_stdin[0] = fd_stdin[1] = fd_stdout[0] = fd_stdout[1] = -1; + in = out = NULL; + + if (pipe(fd_stdin) != 0 || pipe(fd_stdout) != 0) { + send_error(conn, 500, http_500_error, + "Cannot create CGI pipe: %s", strerror(ERRNO)); + goto done; + } else if ((pid = spawn_process(conn, p, blk.buf, blk.vars, + fd_stdin[0], fd_stdout[1], dir)) == (pid_t) -1) { + goto done; + } else if ((in = fdopen(fd_stdin[1], "wb")) == NULL || + (out = fdopen(fd_stdout[0], "rb")) == NULL) { + send_error(conn, 500, http_500_error, + "fopen: %s", strerror(ERRNO)); + goto done; + } + + setbuf(in, NULL); + setbuf(out, NULL); + + /* + * spawn_process() must close those! + * 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. + */ + fd_stdin[0] = fd_stdout[1] = -1; + + /* Send POST data to the CGI process if needed */ + if (!strcmp(conn->request_info.request_method, "POST") && + !handle_request_body(conn, in)) { + goto done; + } + + /* + * 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, INVALID_SOCKET, NULL, + buf, sizeof(buf), &data_len); + if (headers_len <= 0) { + send_error(conn, 500, http_500_error, + "CGI program sent malformed HTTP headers: [%.*s]", + 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 = get_header(&ri, "Status"); + conn->request_info.status_code = status == NULL ? 200 : atoi(status); + (void) mg_printf(conn, "HTTP/1.1 %d OK\r\n", + conn->request_info.status_code); + + /* Send headers */ + for (i = 0; i < ri.num_headers; i++) + (void) mg_printf(conn, "%s: %s\r\n", + ri.http_headers[i].name, + ri.http_headers[i].value); + (void) mg_write(conn, "\r\n", 2); + + /* Send chunk of data that may be read after the headers */ + conn->num_bytes_sent += mg_write(conn, + buf + headers_len, data_len - headers_len); + + /* Read the rest of CGI output and send to the client */ + send_opened_file_stream(conn, out, INT64_MAX); + +done: + if (pid != (pid_t) -1) + kill(pid, SIGTERM); + if (fd_stdin[0] != -1) + (void) close(fd_stdin[0]); + if (fd_stdout[1] != -1) + (void) close(fd_stdout[1]); + + if (in != NULL) + (void) fclose(in); + else if (fd_stdin[1] != -1) + (void) close(fd_stdin[1]); + + if (out != NULL) + (void) fclose(out); + else if (fd_stdout[0] != -1) + (void) close(fd_stdout[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(const char *path) +{ + char buf[FILENAME_MAX]; + const char *s, *p; + struct mgstat st; + size_t len; + + for (s = p = path + 2; (p = strchr(s, '/')) != NULL; s = ++p) { + len = p - path; + assert(len < sizeof(buf)); + (void) memcpy(buf, path, len); + buf[len] = '\0'; + + /* Try to create intermediate directory */ + if (mg_stat(buf, &st) == -1 && mg_mkdir(buf, 0755) != 0) + return (-1); + + /* Is path itself a directory ? */ + if (p[1] == '\0') + return (0); + } + + return (1); +} + +static void +put_file(struct mg_connection *conn, const char *path) +{ + struct mgstat st; + FILE *fp; + int rc; + + conn->request_info.status_code = mg_stat(path, &st) == 0 ? 200 : 201; + + if (mg_get_header(conn, "Range")) { + send_error(conn, 501, "Not Implemented", + "%s", "Range support for PUT requests is not implemented"); + } else if ((rc = put_dir(path)) == 0) { + (void) mg_printf(conn, "HTTP/1.1 %d OK\r\n\r\n", + conn->request_info.status_code); + } else if (rc == -1) { + send_error(conn, 500, http_500_error, + "put_dir(%s): %s", path, strerror(ERRNO)); + } else if ((fp = mg_fopen(path, "wb+")) == NULL) { + send_error(conn, 500, http_500_error, + "fopen(%s): %s", path, strerror(ERRNO)); + } else { + set_close_on_exec(fileno(fp)); + if (handle_request_body(conn, fp)) + (void) mg_printf(conn, "HTTP/1.1 %d OK\r\n\r\n", + conn->request_info.status_code); + (void) fclose(fp); + } +} + +#if !defined(NO_SSI) +static void send_ssi_file(struct mg_connection *, const char *, FILE *, int); + +static void +do_ssi_include(struct mg_connection *conn, const char *ssi, char *tag, + int include_level) +{ + char file_name[BUFSIZ], path[FILENAME_MAX], *p; + FILE *fp; + + /* + * sscanf() is safe here, since send_ssi_file() also uses buffer + * of size BUFSIZ to get the tag. So strlen(tag) is always < BUFSIZ. + */ + if (sscanf(tag, " virtual=\"%[^\"]\"", file_name) == 1) { + /* File name is relative to the webserver root */ + lock_option(conn->ctx, OPT_ROOT); + (void) mg_snprintf(conn, path, sizeof(path), "%s%c%s", + conn->ctx->options[OPT_ROOT], DIRSEP, file_name); + unlock_option(conn->ctx, OPT_ROOT); + } else if (sscanf(tag, " file=\"%[^\"]\"", 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_name) == 1) { + /* File name is relative to the currect document */ + (void) mg_snprintf(conn, path, sizeof(path), "%s", ssi); + if ((p = strrchr(path, DIRSEP)) != 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 ((fp = mg_fopen(path, "rb")) == NULL) { + cry(conn, "Cannot open SSI #include: [%s]: fopen(%s): %s", + tag, path, strerror(ERRNO)); + } else { + set_close_on_exec(fileno(fp)); + if (match_extension(path, + conn->ctx->options[OPT_SSI_EXTENSIONS])) { + send_ssi_file(conn, path, fp, include_level + 1); + } else { + send_opened_file_stream(conn, fp, INT64_MAX); + } + (void) fclose(fp); + } +} + +static void +do_ssi_exec(struct mg_connection *conn, char *tag) +{ + char cmd[BUFSIZ]; + FILE *fp; + + if (sscanf(tag, " \"%[^\"]\"", cmd) != 1) { + cry(conn, "Bad SSI #exec: [%s]", tag); + } else if ((fp = popen(cmd, "r")) == NULL) { + cry(conn, "Cannot SSI #exec: [%s]: %s", cmd, strerror(ERRNO)); + } else { + send_opened_file_stream(conn, fp, INT64_MAX); + (void) pclose(fp); + } +} + +static void +send_ssi_file(struct mg_connection *conn, const char *path, FILE *fp, + int include_level) +{ + char buf[BUFSIZ]; + int ch, len, in_ssi_tag; + + if (include_level > 10) { + cry(conn, "SSI #include level is too deep (%s)", path); + return; + } + + in_ssi_tag = FALSE; + len = 0; + + while ((ch = fgetc(fp)) != EOF) { + if (in_ssi_tag && ch == '>') { + in_ssi_tag = FALSE; + buf[len++] = ch & 0xff; + buf[len] = '\0'; + assert(len <= (int) sizeof(buf)); + if (len < 6 || memcmp(buf, "<!--#", 5) != 0) { + /* Not an SSI tag, pass it */ + (void) mg_write(conn, buf, len); + } else { + if (!memcmp(buf + 5, "include", 7)) { + do_ssi_include(conn, path, buf + 12, + include_level); + } else if (!memcmp(buf + 5, "exec", 4)) { + do_ssi_exec(conn, buf + 9); + } else { + cry(conn, "%s: unknown SSI " + "command: \"%s\"", path, buf); + } + } + len = 0; + } else if (in_ssi_tag) { + if (len == 5 && memcmp(buf, "<!--#", 5) != 0) { + /* Not an SSI tag */ + in_ssi_tag = FALSE; + } else if (len == (int) sizeof(buf) - 2) { + cry(conn, "%s: SSI tag is too large", path); + len = 0; + } + buf[len++] = ch & 0xff; + } else if (ch == '<') { + in_ssi_tag = TRUE; + if (len > 0) + (void) mg_write(conn, buf, len); + len = 0; + buf[len++] = ch & 0xff; + } else { + buf[len++] = ch & 0xff; + if (len == (int) sizeof(buf)) { + (void) mg_write(conn, buf, len); + len = 0; + } + } + } + + /* Send the rest of buffered data */ + if (len > 0) + (void) mg_write(conn, buf, len); + +} + +static void +send_ssi(struct mg_connection *conn, const char *path) +{ + FILE *fp; + + if ((fp = mg_fopen(path, "rb")) == NULL) { + send_error(conn, 500, http_500_error, + "fopen(%s): %s", path, strerror(ERRNO)); + } else { + set_close_on_exec(fileno(fp)); + (void) mg_printf(conn, "%s", "HTTP/1.1 200 OK\r\n" + "Content-Type: text/html\r\nConnection: close\r\n\r\n"); + send_ssi_file(conn, path, fp, 0); + (void) fclose(fp); + } +} +#endif /* !NO_SSI */ + +void +mg_authorize(struct mg_connection *conn) +{ + conn->embedded_auth = TRUE; +} + +static bool_t +check_embedded_authorization(struct mg_connection *conn) +{ + const struct callback *cb; + bool_t authorized; + + authorized = TRUE; + cb = find_callback(conn->ctx, TRUE, conn->request_info.uri, -1); + + if (cb != NULL) { + cb->func(conn, &conn->request_info, cb->user_data); + authorized = conn->embedded_auth; + } + + return (authorized); +} + +/* + * 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 +analyze_request(struct mg_connection *conn) +{ + struct mg_request_info *ri = &conn->request_info; + char path[FILENAME_MAX], *uri = ri->uri; + struct mgstat st; + const struct callback *cb; + + if ((conn->request_info.query_string = strchr(uri, '?')) != NULL) + * conn->request_info.query_string++ = '\0'; + + (void) url_decode(uri, (int) strlen(uri), uri, strlen(uri) + 1, FALSE); + remove_double_dots_and_double_slashes(uri); + convert_uri_to_file_name(conn, uri, path, sizeof(path)); + + if (!check_authorization(conn, path)) { + send_authorization_request(conn); + } else if (check_embedded_authorization(conn) == FALSE) { + /* + * Embedded code failed authorization. Do nothing here, since + * an embedded code must handle this itself by either + * showing proper error message, or redirecting to some + * sort of login page, or something else. + */ + } else if ((cb = find_callback(conn->ctx, FALSE, uri, -1)) != NULL) { + if ((strcmp(ri->request_method, "POST") != 0 && + strcmp(ri->request_method, "PUT") != 0) || + handle_request_body(conn, NULL)) + cb->func(conn, &conn->request_info, cb->user_data); + } else if (strstr(path, PASSWORDS_FILE_NAME)) { + /* Do not allow to view passwords files */ + send_error(conn, 403, "Forbidden", "Access Forbidden"); + } else if ((!strcmp(ri->request_method, "PUT") || + !strcmp(ri->request_method, "DELETE")) && + (conn->ctx->options[OPT_AUTH_PUT] == NULL || + !is_authorized_for_put(conn))) { + send_authorization_request(conn); + } else if (!strcmp(ri->request_method, "PUT")) { + put_file(conn, path); + } else if (!strcmp(ri->request_method, "DELETE")) { + if (mg_remove(path) == 0) + send_error(conn, 200, "OK", ""); + else + send_error(conn, 500, http_500_error, + "remove(%s): %s", path, strerror(ERRNO)); + } else if (mg_stat(path, &st) != 0) { + send_error(conn, 404, "Not Found", "%s", "File not found"); + } else if (st.is_directory && uri[strlen(uri) - 1] != '/') { + (void) mg_printf(conn, + "HTTP/1.1 301 Moved Permanently\r\n" + "Location: %s/\r\n\r\n", uri); + } else if (st.is_directory && + substitute_index_file(conn, path, sizeof(path), &st) == FALSE) { + if (is_true(conn->ctx->options[OPT_DIR_LIST])) { + send_directory(conn, path); + } else { + send_error(conn, 403, "Directory Listing Denied", + "Directory listing denied"); + } +#if !defined(NO_CGI) + } else if (match_extension(path, + conn->ctx->options[OPT_CGI_EXTENSIONS])) { + if (strcmp(ri->request_method, "POST") && + strcmp(ri->request_method, "GET")) { + send_error(conn, 501, "Not Implemented", + "Method %s is not implemented", ri->request_method); + } else { + send_cgi(conn, path); + } +#endif /* NO_CGI */ +#if !defined(NO_SSI) + } else if (match_extension(path, + conn->ctx->options[OPT_SSI_EXTENSIONS])) { + send_ssi(conn, path); +#endif /* NO_SSI */ + } else if (is_not_modified(conn, &st)) { + send_error(conn, 304, "Not Modified", ""); + } else { + send_file(conn, path, &st); + } +} + +static void +close_all_listening_sockets(struct mg_context *ctx) +{ + int i; + + for (i = 0; i < ctx->num_listeners; i++) + (void) closesocket(ctx->listeners[i].sock); + ctx->num_listeners = 0; +} + +static bool_t +set_ports_option(struct mg_context *ctx, const char *list) +{ + SOCKET sock; + int is_ssl; + struct vec vec; + struct socket *listener; + + close_all_listening_sockets(ctx); + assert(ctx->num_listeners == 0); + + while ((list = next_option(list, &vec, NULL)) != NULL) { + + is_ssl = vec.ptr[vec.len - 1] == 's' ? TRUE : FALSE; + listener = ctx->listeners + ctx->num_listeners; + + if (ctx->num_listeners >= + (int) (ARRAY_SIZE(ctx->listeners) - 1)) { + cry(fc(ctx), "%s", "Too many listeninig sockets"); + return (FALSE); + } else if ((sock = mg_open_listening_port(ctx, + vec.ptr, &listener->lsa)) == INVALID_SOCKET) { + cry(fc(ctx), "cannot bind to %.*s", vec.len, vec.ptr); + return (FALSE); + } else if (is_ssl == TRUE && ctx->ssl_ctx == NULL) { + (void) closesocket(sock); + cry(fc(ctx), "cannot add SSL socket, please specify " + "-ssl_cert option BEFORE -ports option"); + return (FALSE); + } else { + listener->sock = sock; + listener->is_ssl = is_ssl; + ctx->num_listeners++; + } + } + + return (TRUE); +} + +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; + char date[64]; + + if (conn->ctx->access_log == NULL) + return; + + (void) strftime(date, sizeof(date), "%d/%b/%Y:%H:%M:%S %z", + localtime(&conn->birth_time)); + + ri = &conn->request_info; + + flockfile(conn->ctx->access_log); + + (void) fprintf(conn->ctx->access_log, + "%s - %s [%s] \"%s %s HTTP/%s\" %d %" INT64_FMT, + inet_ntoa(conn->client.rsa.u.sin.sin_addr), + ri->remote_user == NULL ? "-" : ri->remote_user, + date, + ri->request_method ? ri->request_method : "-", + ri->uri ? ri->uri : "-", + ri->http_version, + conn->request_info.status_code, conn->num_bytes_sent); + log_header(conn, "Referer", conn->ctx->access_log); + log_header(conn, "User-Agent", conn->ctx->access_log); + (void) fputc('\n', conn->ctx->access_log); + (void) fflush(conn->ctx->access_log); + + funlockfile(conn->ctx->access_log); +} + +static bool_t +isbyte(int n) { + return (n >= 0 && n <= 255); +} + +/* + * 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, const char *list, const struct usa *usa) +{ + int a, b, c, d, n, mask, allowed; + char flag; + uint32_t acl_subnet, acl_mask, remote_ip; + struct vec vec; + + (void) memcpy(&remote_ip, &usa->u.sin.sin_addr, sizeof(remote_ip)); + + /* If any ACL is set, deny by default */ + allowed = '-'; + + while ((list = next_option(list, &vec, NULL)) != NULL) { + + mask = 32; + + if (sscanf(vec.ptr, "%c%d.%d.%d.%d%n", + &flag, &a, &b, &c, &d, &n) != 5) { + cry(fc(ctx), + "%s: subnet must be [+|-]x.x.x.x[/x]", __func__); + return (-1); + } else if (flag != '+' && flag != '-') { + cry(fc(ctx), "%s: flag must be + or -: [%s]", + __func__, vec.ptr); + return (-1); + } else if (!isbyte(a)||!isbyte(b)||!isbyte(c)||!isbyte(d)) { + cry(fc(ctx), + "%s: bad ip address: [%s]", __func__, vec.ptr); + return (-1); + } else if (sscanf(vec.ptr + n, "/%d", &mask) == 0) { + /* Do nothing, no mask specified */ + } else if (mask < 0 || mask > 32) { + cry(fc(ctx), "%s: bad subnet mask: %d [%s]", + __func__, n, vec.ptr); + return (-1); + } + + acl_subnet = ((uint32_t)a << 24) | ((uint32_t)b << 16) | ((uint32_t)c << 8) | (uint32_t)d; + acl_mask = mask ? 0xffffffffU << (32 - mask) : 0; + + if (acl_subnet == (ntohl(remote_ip) & acl_mask)) + allowed = flag; + } + + return (allowed == '+' ? 1 : 0); +} + +static void +add_to_set(SOCKET fd, fd_set *set, int *max_fd) +{ + FD_SET(fd, set); + if (fd > (SOCKET) *max_fd) + *max_fd = (int) fd; +} + +/* + * Deallocate mongoose context, free up the resources + */ +static void +mg_fini(struct mg_context *ctx) +{ + int i; + + close_all_listening_sockets(ctx); + + /* Wait until all threads finish */ + (void) pthread_mutex_lock(&ctx->thr_mutex); + while (ctx->num_threads > 0) + (void) pthread_cond_wait(&ctx->thr_cond, &ctx->thr_mutex); + (void) pthread_mutex_unlock(&ctx->thr_mutex); + + /* Deallocate all registered callbacks */ + for (i = 0; i < ctx->num_callbacks; i++) + if (ctx->callbacks[i].uri_regex != NULL) + free(ctx->callbacks[i].uri_regex); + + /* Deallocate all options */ + for (i = 0; i < NUM_OPTIONS; i++) + if (ctx->options[i] != NULL) + free(ctx->options[i]); + + /* Close log files */ + if (ctx->access_log) + (void) fclose(ctx->access_log); + if (ctx->error_log) + (void) fclose(ctx->error_log); + + /* Deallocate SSL context */ + if (ctx->ssl_ctx) + SSL_CTX_free(ctx->ssl_ctx); + + /* Deallocate mutexes and condvars */ + for (i = 0; i < NUM_OPTIONS; i++) + (void) pthread_mutex_destroy(&ctx->opt_mutex[i]); + + (void) pthread_mutex_destroy(&ctx->thr_mutex); + (void) pthread_mutex_destroy(&ctx->bind_mutex); + (void) pthread_cond_destroy(&ctx->thr_cond); + (void) pthread_cond_destroy(&ctx->empty_cond); + (void) pthread_cond_destroy(&ctx->full_cond); + + /* Signal mg_stop() that we're done */ + ctx->stop_flag = 2; +} + +#if !defined(_WIN32) +static bool_t +set_uid_option(struct mg_context *ctx, const char *uid) +{ + struct passwd *pw; + int retval = FALSE; + + 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 + retval = TRUE; + + return (retval); +} +#endif /* !_WIN32 */ + +#if !defined(NO_SSL) +void +mg_set_ssl_password_callback(struct mg_context *ctx, mg_spcb_t func) +{ + ctx->ssl_password_callback = func; +} + +static pthread_mutex_t *ssl_mutexes; + +static void +ssl_locking_callback(int mode, int mutex_num, const char *file, int line) +{ + line = 0; /* Unused */ + file = NULL; /* Unused */ + + if (mode & 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()); +} + +static bool_t +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 (FALSE); + } + + 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: cannot find %s", __func__, fp->name); + return (FALSE); + } else { + fp->ptr = u.fp; + } + } + + return (TRUE); +} + +/* + * Dynamically load SSL library. Set up ctx->ssl_ctx pointer. + */ +static bool_t +set_ssl_option(struct mg_context *ctx, const char *pem) +{ + SSL_CTX *CTX; + int i, size, retval = FALSE; + + if (load_dll(ctx, SSL_LIB, ssl_sw) == FALSE || + load_dll(ctx, CRYPTO_LIB, crypto_sw) == FALSE) + return (FALSE); + + /* Initialize SSL crap */ + SSL_library_init(); + + if ((CTX = SSL_CTX_new(SSLv23_server_method())) == NULL) + cry(fc(ctx), "SSL_CTX_new error"); + else if (ctx->ssl_password_callback != NULL) + SSL_CTX_set_default_passwd_cb(CTX, ctx->ssl_password_callback); + + if (CTX != NULL && SSL_CTX_use_certificate_file( + CTX, pem, SSL_FILETYPE_PEM) == 0) + cry(fc(ctx), "%s: cannot open %s", __func__, pem); + else if (CTX != NULL && SSL_CTX_use_PrivateKey_file( + CTX, pem, SSL_FILETYPE_PEM) == 0) + cry(fc(ctx), "%s: cannot open %s", NULL, pem); + else + retval = TRUE; + + /* + * 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)) == NULL) { + cry(fc(ctx), "%s: cannot allocate mutexes", __func__); + return (FALSE); + } + + 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); + + /* Done with everything. Save the context. */ + ctx->ssl_ctx = CTX; + + return (retval); +} +#endif /* !NO_SSL */ + +static bool_t +open_log_file(struct mg_context *ctx, FILE **fpp, const char *path) +{ + bool_t retval = TRUE; + + if (*fpp != NULL) + (void) fclose(*fpp); + + if (path == NULL) { + *fpp = NULL; + } else if ((*fpp = mg_fopen(path, "a")) == NULL) { + cry(fc(ctx), "%s(%s): %s", __func__, path, strerror(errno)); + retval = FALSE; + } else { + set_close_on_exec(fileno(*fpp)); + } + + return (retval); +} + +static bool_t +set_alog_option(struct mg_context *ctx, const char *path) +{ + return (open_log_file(ctx, &ctx->access_log, path)); +} + +static bool_t +set_elog_option(struct mg_context *ctx, const char *path) +{ + return (open_log_file(ctx, &ctx->error_log, path)); +} + +static bool_t +set_gpass_option(struct mg_context *ctx, const char *path) +{ + struct mgstat mgstat; + ctx = NULL; + return (mg_stat(path, &mgstat) == 0); +} + +static bool_t +set_max_threads_option(struct mg_context *ctx, const char *str) +{ + ctx->max_threads = atoi(str); + return (TRUE); +} + +static bool_t +set_acl_option(struct mg_context *ctx, const char *acl) +{ + struct usa fake; + + return (check_acl(ctx, acl, &fake) != -1); +} + +static void admin_page(struct mg_connection *, + const struct mg_request_info *, void *); +static bool_t +set_admin_uri_option(struct mg_context *ctx, const char *uri) +{ + mg_set_uri_callback(ctx, uri, &admin_page, NULL); + return (TRUE); +} + +/* + * Check if the comma-separated list of options has a format of key-value + * pairs: "k1=v1,k2=v2". Return FALSE if any entry has invalid key or value. + */ +static bool_t +set_kv_list_option(struct mg_context *ctx, const char *str) +{ + const char *list; + struct vec key, value; + + list = str; + while ((list = next_option(list, &key, &value)) != NULL) + if (key.len == 0 || value.len == 0) { + cry(fc(ctx), "Invalid list specified: [%s], " + "expecting key1=value1,key2=value2,...", str); + return (FALSE); + } + + return (TRUE); +} + +static const struct mg_option known_options[] = { + {"root", "\tWeb root directory", ".", OPT_ROOT, NULL}, + {"index_files", "Index files", "index.html,index.htm,index.cgi", + OPT_INDEX_FILES, NULL}, +#if !defined(NO_SSL) + {"ssl_cert", "SSL certificate file", NULL, + OPT_SSL_CERTIFICATE, &set_ssl_option}, +#endif /* !NO_SSL */ + {"ports", "Listening ports", NULL, + OPT_PORTS, &set_ports_option}, + {"dir_list", "Directory listing", "yes", + OPT_DIR_LIST, NULL}, + {"protect", "URI to htpasswd mapping", NULL, + OPT_PROTECT, &set_kv_list_option}, +#if !defined(NO_CGI) + {"cgi_ext", "CGI extensions", ".cgi,.pl,.php", + OPT_CGI_EXTENSIONS, NULL}, + {"cgi_interp", "CGI interpreter to use with all CGI scripts", NULL, + OPT_CGI_INTERPRETER, NULL}, + {"cgi_env", "Custom CGI enviroment variables", NULL, + OPT_CGI_ENV, &set_kv_list_option}, +#endif /* NO_CGI */ + {"ssi_ext", "SSI extensions", ".shtml,.shtm", + OPT_SSI_EXTENSIONS, NULL}, + {"auth_realm", "Authentication domain name", "mydomain.com", + OPT_AUTH_DOMAIN, NULL}, + {"auth_gpass", "Global passwords file", NULL, + OPT_AUTH_GPASSWD, &set_gpass_option}, + {"auth_PUT", "PUT,DELETE auth file", NULL, + OPT_AUTH_PUT, NULL}, +#if !defined(_WIN32) + {"uid", "\tRun as user", NULL, OPT_UID, &set_uid_option}, +#endif /* !_WIN32 */ + {"access_log", "Access log file", NULL, + OPT_ACCESS_LOG, &set_alog_option}, + {"error_log", "Error log file", NULL, + OPT_ERROR_LOG, &set_elog_option}, + {"aliases", "Path=URI mappings", NULL, + OPT_ALIASES, &set_kv_list_option}, + {"admin_uri", "Administration page URI", NULL, + OPT_ADMIN_URI, &set_admin_uri_option}, + {"acl", "\tAllow/deny IP addresses/subnets", NULL, + OPT_ACL, &set_acl_option}, + {"max_threads", "Maximum simultaneous threads to spawn", "100", + OPT_MAX_THREADS, &set_max_threads_option}, + {"idle_time", "Time in seconds connection stays idle", "10", + OPT_IDLE_TIME, NULL}, + {"mime_types", "Comma separated list of ext=mime_type pairs", NULL, + OPT_MIME_TYPES, &set_kv_list_option}, + {NULL, NULL, NULL, 0, NULL} +}; + +static const struct mg_option * +find_opt(const char *opt_name) +{ + int i; + + for (i = 0; known_options[i].name != NULL; i++) + if (!strcmp(opt_name, known_options[i].name)) + return (known_options + i); + + return (NULL); +} + +int +mg_set_option(struct mg_context *ctx, const char *opt, const char *val) +{ + const struct mg_option *option; + int i, retval; + + DEBUG_TRACE((DEBUG_MGS_PREFIX "%s: [%s]->[%s]", __func__, opt, val)); + if (opt != NULL && (option = find_opt(opt)) != NULL) { + i = (int) (option - known_options); + lock_option(ctx, i); + + if (option->setter != NULL) + retval = option->setter(ctx, val); + else + retval = TRUE; + + /* Free old value if any */ + if (ctx->options[option->index] != NULL) + free(ctx->options[option->index]); + + /* Set new option value */ + ctx->options[option->index] = val ? mg_strdup(val) : NULL; + unlock_option(ctx, i); + + if (retval == FALSE) + cry(fc(ctx), "%s(%s): failure", __func__, opt); + } else { + cry(fc(ctx), "%s: No such option: [%s]", __func__, opt); + retval = -1; + } + + return (retval); +} + +void +mg_show_usage_string(FILE *fp) +{ + const struct mg_option *o; + + (void) fprintf(stderr, + "Mongoose version %s (c) Sergey Lyubka\n" + "usage: mongoose [options] [config_file]\n", mg_version()); + + fprintf(fp, " -A <htpasswd_file> <realm> <user> <passwd>\n"); + + for (o = known_options; o->name != NULL; o++) { + (void) fprintf(fp, " -%s\t%s", o->name, o->description); + if (o->default_value != NULL) + fprintf(fp, " (default: \"%s\")", o->default_value); + fputc('\n', fp); + } +} + +const char * +mg_get_option(const struct mg_context *ctx, const char *option_name) +{ + const struct mg_option *option; + + if ((option = find_opt(option_name)) != NULL) + return (ctx->options[option->index]); + else + return (NULL); +} + +static void +admin_page(struct mg_connection *conn, const struct mg_request_info *ri, + void *user_data) +{ + const struct mg_option *option; + const char *option_name, *option_value; + + user_data = NULL; /* Unused */ + + (void) mg_printf(conn, + "HTTP/1.1 200 OK\r\n" + "Content-Type: text/html\r\n\r\n" + "<html><body><h1>Mongoose v. %s</h1>", mg_version()); + + if (!strcmp(ri->request_method, "POST")) { + option_name = mg_get_var(conn, "o"); + option_value = mg_get_var(conn, "v"); + if (mg_set_option(conn->ctx, + option_name, option_value) == -1) { + (void) mg_printf(conn, + "<p style=\"background: red\">Error setting " + "option \"%s\"</p>", + option_name ? option_name : "(null)"); + } else { + (void) mg_printf(conn, + "<p style=\"color: green\">Saved: %s=%s</p>", + option_name, option_value ? option_value : "NULL"); + } + } + + /* Print table with all options */ + (void) mg_printf(conn, "%s", "<table border=\"1\"" + "<tr><th>Option</th><th>Description</th>" + "<th colspan=2>Value</th></tr>"); + + for (option = known_options; option->name != NULL; option++) { + option_value = mg_get_option(conn->ctx, option->name); + if (option_value == NULL) + option_value = ""; + (void) mg_printf(conn, + "<form method=post><tr><td>%s</td><td>%s</td>" + "<input type=hidden name=o value='%s'>" + "<td><input type=text name=v value='%s'></td>" + "<td><input type=submit value=save></td></form></tr>", + option->name, option->description, + option->name, option_value); + } + + (void) mg_printf(conn, "%s", "</table></body></html>"); +} + +static void +reset_per_request_attributes(struct mg_connection *conn) +{ + if (conn->request_info.remote_user != NULL) { + free((void *) conn->request_info.remote_user); + conn->request_info.remote_user = NULL; + } + if (conn->free_post_data && conn->request_info.post_data != NULL) { + free((void *) conn->request_info.post_data); + conn->request_info.post_data = NULL; + } +} + +static void +close_socket_gracefully(struct mg_connection *conn, SOCKET sock) +{ + char buf[BUFSIZ]; + int n; + + /* Send FIN to the client */ + (void) shutdown(sock, SHUT_WR); + set_non_blocking_mode(conn, sock); + + /* + * Read and discard pending 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 decide to close the connection; then when client + * does recv() it gets no data back. + */ + do { + n = pull(NULL, sock, NULL, buf, sizeof(buf)); + } while (n > 0); + + /* Now we know that our FIN is ACK-ed, safe to close */ + (void) closesocket(sock); +} + +static void +close_connection(struct mg_connection *conn) +{ + reset_per_request_attributes(conn); + + if (conn->ssl) + SSL_free(conn->ssl); + + if (conn->client.sock != INVALID_SOCKET) + close_socket_gracefully(conn, conn->client.sock); +} + +static void +reset_connection_attributes(struct mg_connection *conn) +{ + reset_per_request_attributes(conn); + conn->free_post_data = FALSE; + conn->request_info.status_code = -1; + conn->num_bytes_sent = 0; + (void) memset(&conn->request_info, 0, sizeof(conn->request_info)); +} + +static void +shift_to_next(struct mg_connection *conn, char *buf, int req_len, int *nread) +{ + int64_t cl; + int over_len, body_len; + + cl = get_content_length(conn); + over_len = *nread - req_len; + assert(over_len >= 0); + + if (cl == -1) { + body_len = 0; + } else if (cl < (int64_t) over_len) { + body_len = (int) cl; + } else { + body_len = over_len; + } + + *nread -= req_len + body_len; + (void) memmove(buf, buf + req_len + body_len, *nread); +} + +static void +process_new_connection(struct mg_connection *conn) +{ + struct mg_request_info *ri = &conn->request_info; + char buf[MAX_REQUEST_SIZE]; + int request_len, nread; + + nread = 0; + reset_connection_attributes(conn); + + /* If next request is not pipelined, read it in */ + if ((request_len = get_request_len(buf, (size_t) nread)) == 0) + request_len = read_request(NULL, conn->client.sock, + conn->ssl, buf, sizeof(buf), &nread); + assert(nread >= request_len); + + if (request_len <= 0) + return; /* Remote end closed the connection */ + + /* 0-terminate the request: parse_request uses sscanf */ + buf[request_len - 1] = '\0'; + + if (parse_http_request(buf, ri, &conn->client.rsa)) { + if (strcmp(ri->http_version, "1.0") != 0 && + strcmp(ri->http_version, "1.1") != 0) { + send_error(conn, 505, + "HTTP version not supported", + "%s", "Weird HTTP version"); + log_access(conn); + } else { + ri->post_data = buf + request_len; + ri->post_data_len = nread - request_len; + conn->birth_time = time(NULL); + analyze_request(conn); + log_access(conn); + shift_to_next(conn, buf, request_len, &nread); + } + } else { + /* Do not put garbage in the access log */ + send_error(conn, 400, "Bad Request", + "Can not parse request: [%.*s]", nread, buf); + } + +} + +/* + * Worker threads take accepted socket from the queue + */ +static bool_t +get_socket(struct mg_context *ctx, struct socket *sp) +{ + struct timespec ts; + + (void) pthread_mutex_lock(&ctx->thr_mutex); + DEBUG_TRACE((DEBUG_MGS_PREFIX "%s: thread %p: going idle", + __func__, (void *) pthread_self())); + + /* If the queue is empty, wait. We're idle at this point. */ + ctx->num_idle++; + while (ctx->sq_head == ctx->sq_tail) { + ts.tv_nsec = 0; + ts.tv_sec = time(NULL) + atoi(ctx->options[OPT_IDLE_TIME]) + 1; + if (pthread_cond_timedwait(&ctx->empty_cond, + &ctx->thr_mutex, &ts) != 0) { + /* Timeout! release the mutex and return */ + (void) pthread_mutex_unlock(&ctx->thr_mutex); + return (FALSE); + } + } + assert(ctx->sq_head > ctx->sq_tail); + + /* We're going busy now: got a socket to process! */ + ctx->num_idle--; + + /* Copy socket from the queue and increment tail */ + *sp = ctx->queue[ctx->sq_tail % ARRAY_SIZE(ctx->queue)]; + ctx->sq_tail++; + DEBUG_TRACE((DEBUG_MGS_PREFIX + "%s: thread %p grabbed socket %d, going busy", + __func__, (void *) pthread_self(), 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); + } + + pthread_cond_signal(&ctx->full_cond); + (void) pthread_mutex_unlock(&ctx->thr_mutex); + + return (TRUE); +} + +static void +worker_thread(struct mg_context *ctx) +{ + struct mg_connection conn; + + DEBUG_TRACE((DEBUG_MGS_PREFIX "%s: thread %p starting", + __func__, (void *) pthread_self())); + + (void) memset(&conn, 0, sizeof(conn)); + + while (get_socket(ctx, &conn.client) == TRUE) { + conn.birth_time = time(NULL); + conn.ctx = ctx; + + if (conn.client.is_ssl && + (conn.ssl = SSL_new(conn.ctx->ssl_ctx)) == NULL) { + cry(&conn, "%s: SSL_new: %d", __func__, ERRNO); + } else if (conn.client.is_ssl && + SSL_set_fd(conn.ssl, conn.client.sock) != 1) { + cry(&conn, "%s: SSL_set_fd: %d", __func__, ERRNO); + } else if (conn.client.is_ssl && SSL_accept(conn.ssl) != 1) { + cry(&conn, "%s: SSL handshake error", __func__); + } else { + process_new_connection(&conn); + } + + close_connection(&conn); + } + + /* Signal master that we're done with connection and exiting */ + pthread_mutex_lock(&ctx->thr_mutex); + ctx->num_threads--; + ctx->num_idle--; + pthread_cond_signal(&ctx->thr_cond); + assert(ctx->num_threads >= 0); + pthread_mutex_unlock(&ctx->thr_mutex); + + DEBUG_TRACE((DEBUG_MGS_PREFIX "%s: thread %p exiting", + __func__, (void *) pthread_self())); +} + +/* + * Master thread adds accepted socket to a queue + */ +static void +put_socket(struct mg_context *ctx, const struct socket *sp) +{ + (void) pthread_mutex_lock(&ctx->thr_mutex); + + /* If the queue is full, wait */ + while (ctx->sq_head - ctx->sq_tail >= (int) ARRAY_SIZE(ctx->queue)) + (void) pthread_cond_wait(&ctx->full_cond, &ctx->thr_mutex); + assert(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((DEBUG_MGS_PREFIX "%s: queued socket %d", + __func__, sp->sock)); + + /* If there are no idle threads, start one */ + if (ctx->num_idle == 0 && ctx->num_threads < ctx->max_threads) { + if (start_thread(ctx, + (mg_thread_func_t) worker_thread, ctx) != 0) + cry(fc(ctx), "Cannot start thread: %d", ERRNO); + else + ctx->num_threads++; + } + + pthread_cond_signal(&ctx->empty_cond); + (void) pthread_mutex_unlock(&ctx->thr_mutex); +} + +static void +accept_new_connection(const struct socket *listener, struct mg_context *ctx) +{ + struct socket accepted; + + accepted.rsa.len = sizeof(accepted.rsa.u.sin); + accepted.lsa = listener->lsa; + if ((accepted.sock = accept(listener->sock, + &accepted.rsa.u.sa, &accepted.rsa.len)) == INVALID_SOCKET) + return; + + lock_option(ctx, OPT_ACL); + if (ctx->options[OPT_ACL] != NULL && + !check_acl(ctx, ctx->options[OPT_ACL], &accepted.rsa)) { + cry(fc(ctx), "%s: %s is not allowed to connect", + __func__, inet_ntoa(accepted.rsa.u.sin.sin_addr)); + (void) closesocket(accepted.sock); + unlock_option(ctx, OPT_ACL); + return; + } + unlock_option(ctx, OPT_ACL); + + /* Put accepted socket structure into the queue */ + DEBUG_TRACE((DEBUG_MGS_PREFIX "%s: accepted socket %d", + __func__, accepted.sock)); + accepted.is_ssl = listener->is_ssl; + put_socket(ctx, &accepted); +} + +static void +master_thread(struct mg_context *ctx) +{ + fd_set read_set; + struct timeval tv; + int i, max_fd; + + while (ctx->stop_flag == 0) { + FD_ZERO(&read_set); + max_fd = -1; + + /* Add listening sockets to the read set */ + lock_option(ctx, OPT_PORTS); + for (i = 0; i < ctx->num_listeners; i++) + add_to_set(ctx->listeners[i].sock, &read_set, &max_fd); + unlock_option(ctx, OPT_PORTS); + + tv.tv_sec = 1; + tv.tv_usec = 0; + + if (select(max_fd + 1, &read_set, NULL, NULL, &tv) < 0) { +#ifdef _WIN32 + /* + * On windows, if read_set and write_set are empty, + * select() returns "Invalid parameter" error + * (at least on my Windows XP Pro). So in this case, + * we sleep here. + */ + sleep(1); +#endif /* _WIN32 */ + } else { + lock_option(ctx, OPT_PORTS); + for (i = 0; i < ctx->num_listeners; i++) + if (FD_ISSET(ctx->listeners[i].sock, &read_set)) + accept_new_connection( + ctx->listeners + i, ctx); + unlock_option(ctx, OPT_PORTS); + } + } + + /* Stop signal received: somebody called mg_stop. Quit. */ + mg_fini(ctx); +} + +void +mg_stop(struct mg_context *ctx) +{ + ctx->stop_flag = 1; + + /* Wait until mg_fini() stops */ + while (ctx->stop_flag != 2) + (void) sleep(1); + + assert(ctx->num_threads == 0); + free(ctx); + +#if defined(_WIN32) + (void) WSACleanup(); +#endif /* _WIN32 */ +} + +struct mg_context * +mg_start(void) +{ + struct mg_context *ctx; + const struct mg_option *option; + int i; + +#if defined(_WIN32) + WSADATA data; + WSAStartup(MAKEWORD(2,2), &data); +#endif /* _WIN32 */ + + if ((ctx = (struct mg_context *) calloc(1, sizeof(*ctx))) == NULL) { + cry(fc(ctx), "cannot allocate mongoose context"); + return (NULL); + } + + ctx->error_log = stderr; + mg_set_log_callback(ctx, builtin_error_log); + + /* Initialize options. First pass: set default option values */ + for (option = known_options; option->name != NULL; option++) + ctx->options[option->index] = option->default_value == NULL ? + NULL : mg_strdup(option->default_value); + + /* Call setter functions */ + for (option = known_options; option->name != NULL; option++) + if (option->setter != NULL && + ctx->options[option->index] != NULL) + if (option->setter(ctx, + ctx->options[option->index]) == FALSE) { + mg_fini(ctx); + return (NULL); + } + + DEBUG_TRACE((DEBUG_MGS_PREFIX "%s: root [%s]", + __func__, ctx->options[OPT_ROOT])); + +#if !defined(_WIN32) + /* + * Ignore SIGPIPE signal, so if browser cancels the request, it + * won't kill the whole process. + */ + (void) signal(SIGPIPE, SIG_IGN); +#endif /* _WIN32 */ + + /* Initialize options mutexes */ + for (i = 0; i < NUM_OPTIONS; i++) + (void) pthread_mutex_init(&ctx->opt_mutex[i], NULL); + + (void) pthread_mutex_init(&ctx->thr_mutex, NULL); + (void) pthread_mutex_init(&ctx->bind_mutex, NULL); + (void) pthread_cond_init(&ctx->thr_cond, NULL); + (void) pthread_cond_init(&ctx->empty_cond, NULL); + (void) pthread_cond_init(&ctx->full_cond, NULL); + + /* Start master (listening) thread */ + start_thread(ctx, (mg_thread_func_t) master_thread, ctx); + + return (ctx); +} |