diff options
Diffstat (limited to 'freebsd/contrib/tcpdump/tcpdump.c')
| -rw-r--r-- | freebsd/contrib/tcpdump/tcpdump.c | 2201 |
1 files changed, 2201 insertions, 0 deletions
diff --git a/freebsd/contrib/tcpdump/tcpdump.c b/freebsd/contrib/tcpdump/tcpdump.c new file mode 100644 index 00000000..32ffb456 --- /dev/null +++ b/freebsd/contrib/tcpdump/tcpdump.c @@ -0,0 +1,2201 @@ +#include <machine/rtems-bsd-user-space.h> + +/* + * Copyright (c) 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 2000 + * The Regents of the University of California. All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that: (1) source code distributions + * retain the above copyright notice and this paragraph in its entirety, (2) + * distributions including binary code include the above copyright notice and + * this paragraph in its entirety in the documentation or other materials + * provided with the distribution, and (3) all advertising materials mentioning + * features or use of this software display the following acknowledgement: + * ``This product includes software developed by the University of California, + * Lawrence Berkeley Laboratory and its contributors.'' Neither the name of + * the University nor the names of its contributors may be used to endorse + * or promote products derived from this software without specific prior + * written permission. + * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED + * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF + * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. + * + * Support for splitting captures into multiple files with a maximum + * file size: + * + * Copyright (c) 2001 + * Seth Webster <swebster@sst.ll.mit.edu> + */ + +#if 0 +#ifndef lint +static const char copyright[] _U_ = + "@(#) Copyright (c) 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 2000\n\ +The Regents of the University of California. All rights reserved.\n"; +static const char rcsid[] _U_ = + "@(#) $Header: /tcpdump/master/tcpdump/tcpdump.c,v 1.283 2008-09-25 21:45:50 guy Exp $ (LBL)"; +#endif +#endif + +/* $FreeBSD$ */ + +/* + * tcpdump - monitor tcp/ip traffic on an ethernet. + * + * First written in 1987 by Van Jacobson, Lawrence Berkeley Laboratory. + * Mercilessly hacked and occasionally improved since then via the + * combined efforts of Van, Steve McCanne and Craig Leres of LBL. + */ + +#ifdef HAVE_CONFIG_H +#include "config.h" +#endif + +#if __rtems__ +#define __need_getopt_newlib +#include <getopt.h> +#define setpriority(a, b, c) +#endif + +#include <tcpdump-stdinc.h> + +#ifdef WIN32 +#include "getopt.h" +#include "w32_fzs.h" +extern int strcasecmp (const char *__s1, const char *__s2); +extern int SIZE_BUF; +#define off_t long +#define uint UINT +#endif /* WIN32 */ + +#ifdef HAVE_SMI_H +#include <smi.h> +#endif + +#include <pcap.h> +#include <signal.h> +#include <stdio.h> +#include <stdlib.h> +#include <string.h> +#include <limits.h> +#ifndef WIN32 +#include <sys/wait.h> +#include <rtems/bsd/sys/resource.h> +#include <pwd.h> +#include <grp.h> +#include <errno.h> +#endif /* WIN32 */ + +/* capabilities convinience library */ +#ifdef HAVE_CAP_NG_H +#include <cap-ng.h> +#endif /* HAVE_CAP_NG_H */ + +#include "netdissect.h" +#include "interface.h" +#include "addrtoname.h" +#include "machdep.h" +#include "setsignal.h" +#include "gmt2local.h" +#include "pcap-missing.h" + +#ifndef PATH_MAX +#define PATH_MAX 1024 +#endif + +#ifdef SIGINFO +#define SIGNAL_REQ_INFO SIGINFO +#elif SIGUSR1 +#define SIGNAL_REQ_INFO SIGUSR1 +#endif + +netdissect_options Gndo; +netdissect_options *gndo = &Gndo; + +static int dflag; /* print filter code */ +static int Lflag; /* list available data link types and exit */ +#ifdef HAVE_PCAP_SET_TSTAMP_TYPE +static int Jflag; /* list available time stamp types */ +#endif +static char *zflag = NULL; /* compress each savefile using a specified command (like gzip or bzip2) */ + +static int infodelay; +static int infoprint; + +char *program_name; + +int32_t thiszone; /* seconds offset from gmt to local time */ + +/* Forwards */ +static RETSIGTYPE cleanup(int); +static RETSIGTYPE child_cleanup(int); +static void usage(void) __attribute__((noreturn)); +static void show_dlts_and_exit(const char *device, pcap_t *pd) __attribute__((noreturn)); + +static void print_packet(u_char *, const struct pcap_pkthdr *, const u_char *); +static void ndo_default_print(netdissect_options *, const u_char *, u_int); +static void dump_packet_and_trunc(u_char *, const struct pcap_pkthdr *, const u_char *); +static void dump_packet(u_char *, const struct pcap_pkthdr *, const u_char *); +static void droproot(const char *, const char *); +static void ndo_error(netdissect_options *ndo, const char *fmt, ...) + __attribute__ ((noreturn, format (printf, 2, 3))); +static void ndo_warning(netdissect_options *ndo, const char *fmt, ...); + +#ifdef SIGNAL_REQ_INFO +RETSIGTYPE requestinfo(int); +#endif + +#if defined(USE_WIN32_MM_TIMER) + #include <MMsystem.h> + static UINT timer_id; + static void CALLBACK verbose_stats_dump(UINT, UINT, DWORD_PTR, DWORD_PTR, DWORD_PTR); +#elif defined(HAVE_ALARM) + static void verbose_stats_dump(int sig); +#endif + +static void info(int); +static u_int packets_captured; + +struct printer { + if_printer f; + int type; +}; + + +struct ndo_printer { + if_ndo_printer f; + int type; +}; + + +static const struct printer printers[] = { +#if !__rtems__ + { arcnet_if_print, DLT_ARCNET }, +#endif +#ifdef DLT_ARCNET_LINUX + { arcnet_linux_if_print, DLT_ARCNET_LINUX }, +#endif +#if !__rtems__ + { token_if_print, DLT_IEEE802 }, +#endif +#ifdef DLT_LANE8023 + { lane_if_print, DLT_LANE8023 }, +#endif +#ifdef DLT_CIP + { cip_if_print, DLT_CIP }, +#endif +#ifdef DLT_ATM_CLIP + { cip_if_print, DLT_ATM_CLIP }, +#endif + { sl_if_print, DLT_SLIP }, +#ifdef DLT_SLIP_BSDOS + { sl_bsdos_if_print, DLT_SLIP_BSDOS }, +#endif + { ppp_if_print, DLT_PPP }, +#ifdef DLT_PPP_WITHDIRECTION + { ppp_if_print, DLT_PPP_WITHDIRECTION }, +#endif +#ifdef DLT_PPP_BSDOS + { ppp_bsdos_if_print, DLT_PPP_BSDOS }, +#endif +#if !__rtems__ + { fddi_if_print, DLT_FDDI }, +#endif + { null_if_print, DLT_NULL }, +#ifdef DLT_LOOP + { null_if_print, DLT_LOOP }, +#endif + { raw_if_print, DLT_RAW }, +#if !__rtems__ + { atm_if_print, DLT_ATM_RFC1483 }, +#endif +#ifdef DLT_C_HDLC + { chdlc_if_print, DLT_C_HDLC }, +#endif +#ifdef DLT_HDLC + { chdlc_if_print, DLT_HDLC }, +#endif +#ifdef DLT_PPP_SERIAL + { ppp_hdlc_if_print, DLT_PPP_SERIAL }, +#endif +#ifdef DLT_PPP_ETHER + { pppoe_if_print, DLT_PPP_ETHER }, +#endif +#ifdef DLT_LINUX_SLL + { sll_if_print, DLT_LINUX_SLL }, +#endif +#ifdef DLT_IEEE802_11 + { ieee802_11_if_print, DLT_IEEE802_11}, +#endif +#ifdef DLT_LTALK + { ltalk_if_print, DLT_LTALK }, +#endif +#if defined(DLT_PFLOG) && defined(HAVE_NET_PFVAR_H) + { pflog_if_print, DLT_PFLOG }, +#endif +#ifdef DLT_FR + { fr_if_print, DLT_FR }, +#endif +#ifdef DLT_FRELAY + { fr_if_print, DLT_FRELAY }, +#endif +#ifdef DLT_SUNATM + { sunatm_if_print, DLT_SUNATM }, +#endif +#ifdef DLT_IP_OVER_FC + { ipfc_if_print, DLT_IP_OVER_FC }, +#endif +#ifdef DLT_PRISM_HEADER + { prism_if_print, DLT_PRISM_HEADER }, +#endif +#ifdef DLT_IEEE802_11_RADIO + { ieee802_11_radio_if_print, DLT_IEEE802_11_RADIO }, +#endif +#ifdef DLT_ENC + { enc_if_print, DLT_ENC }, +#endif +#ifdef DLT_SYMANTEC_FIREWALL + { symantec_if_print, DLT_SYMANTEC_FIREWALL }, +#endif +#ifdef DLT_APPLE_IP_OVER_IEEE1394 + { ap1394_if_print, DLT_APPLE_IP_OVER_IEEE1394 }, +#endif +#ifdef DLT_IEEE802_11_RADIO_AVS + { ieee802_11_radio_avs_if_print, DLT_IEEE802_11_RADIO_AVS }, +#endif +#ifdef DLT_JUNIPER_ATM1 + { juniper_atm1_print, DLT_JUNIPER_ATM1 }, +#endif +#ifdef DLT_JUNIPER_ATM2 + { juniper_atm2_print, DLT_JUNIPER_ATM2 }, +#endif +#ifdef DLT_JUNIPER_MFR + { juniper_mfr_print, DLT_JUNIPER_MFR }, +#endif +#ifdef DLT_JUNIPER_MLFR + { juniper_mlfr_print, DLT_JUNIPER_MLFR }, +#endif +#ifdef DLT_JUNIPER_MLPPP + { juniper_mlppp_print, DLT_JUNIPER_MLPPP }, +#endif +#ifdef DLT_JUNIPER_PPPOE + { juniper_pppoe_print, DLT_JUNIPER_PPPOE }, +#endif +#ifdef DLT_JUNIPER_PPPOE_ATM + { juniper_pppoe_atm_print, DLT_JUNIPER_PPPOE_ATM }, +#endif +#ifdef DLT_JUNIPER_GGSN + { juniper_ggsn_print, DLT_JUNIPER_GGSN }, +#endif +#ifdef DLT_JUNIPER_ES + { juniper_es_print, DLT_JUNIPER_ES }, +#endif +#ifdef DLT_JUNIPER_MONITOR + { juniper_monitor_print, DLT_JUNIPER_MONITOR }, +#endif +#ifdef DLT_JUNIPER_SERVICES + { juniper_services_print, DLT_JUNIPER_SERVICES }, +#endif +#ifdef DLT_JUNIPER_ETHER + { juniper_ether_print, DLT_JUNIPER_ETHER }, +#endif +#ifdef DLT_JUNIPER_PPP + { juniper_ppp_print, DLT_JUNIPER_PPP }, +#endif +#ifdef DLT_JUNIPER_FRELAY + { juniper_frelay_print, DLT_JUNIPER_FRELAY }, +#endif +#ifdef DLT_JUNIPER_CHDLC + { juniper_chdlc_print, DLT_JUNIPER_CHDLC }, +#endif +#ifdef DLT_MFR + { mfr_if_print, DLT_MFR }, +#endif +#if defined(DLT_BLUETOOTH_HCI_H4_WITH_PHDR) && defined(HAVE_PCAP_BLUETOOTH_H) + { bt_if_print, DLT_BLUETOOTH_HCI_H4_WITH_PHDR}, +#endif +#ifdef HAVE_PCAP_USB_H +#ifdef DLT_USB_LINUX + { usb_linux_48_byte_print, DLT_USB_LINUX}, +#endif /* DLT_USB_LINUX */ +#ifdef DLT_USB_LINUX_MMAPPED + { usb_linux_64_byte_print, DLT_USB_LINUX_MMAPPED}, +#endif /* DLT_USB_LINUX_MMAPPED */ +#endif /* HAVE_PCAP_USB_H */ +#ifdef DLT_IPV4 + { raw_if_print, DLT_IPV4 }, +#endif +#ifdef DLT_IPV6 + { raw_if_print, DLT_IPV6 }, +#endif + { NULL, 0 }, +}; + +static const struct ndo_printer ndo_printers[] = { + { ether_if_print, DLT_EN10MB }, +#ifdef DLT_IPNET + { ipnet_if_print, DLT_IPNET }, +#endif +#ifdef DLT_IEEE802_15_4 + { ieee802_15_4_if_print, DLT_IEEE802_15_4 }, +#endif +#ifdef DLT_IEEE802_15_4_NOFCS + { ieee802_15_4_if_print, DLT_IEEE802_15_4_NOFCS }, +#endif +#ifdef DLT_PPI + { ppi_if_print, DLT_PPI }, +#endif +#ifdef DLT_NETANALYZER + { netanalyzer_if_print, DLT_NETANALYZER }, +#endif +#ifdef DLT_NETANALYZER_TRANSPARENT + { netanalyzer_transparent_if_print, DLT_NETANALYZER_TRANSPARENT }, +#endif + { NULL, 0 }, +}; + +if_printer +lookup_printer(int type) +{ + struct printer *p; + + for (p = printers; p->f; ++p) + if (type == p->type) + return p->f; + + return NULL; + /* NOTREACHED */ +} + +if_ndo_printer +lookup_ndo_printer(int type) +{ + struct ndo_printer *p; + + for (p = ndo_printers; p->f; ++p) + if (type == p->type) + return p->f; + + return NULL; + /* NOTREACHED */ +} + +static pcap_t *pd; + +static int supports_monitor_mode; + +#ifdef __rtems__ +#define optind getopt_data.optind +#define optarg getopt_data.optarg +#define opterr getopt_data.opterr +#define optopt getopt_data.optopt +#define getopt(argc, argv, opt) getopt_r(argc, argv, "+" opt, &getopt_data) +#else +extern int optind; +extern int opterr; +extern char *optarg; +#endif + +struct print_info { + netdissect_options *ndo; + union { + if_printer printer; + if_ndo_printer ndo_printer; + } p; + int ndo_type; +}; + +struct dump_info { + char *WFileName; + char *CurrentFileName; + pcap_t *pd; + pcap_dumper_t *p; +}; + +#ifdef HAVE_PCAP_SET_TSTAMP_TYPE +static void +show_tstamp_types_and_exit(const char *device, pcap_t *pd) +{ + int n_tstamp_types; + int *tstamp_types = 0; + const char *tstamp_type_name; + int i; + + n_tstamp_types = pcap_list_tstamp_types(pd, &tstamp_types); + if (n_tstamp_types < 0) + error("%s", pcap_geterr(pd)); + + if (n_tstamp_types == 0) { + fprintf(stderr, "Time stamp type cannot be set for %s\n", + device); + exit(0); + } + fprintf(stderr, "Time stamp types for %s (use option -j to set):\n", + device); + for (i = 0; i < n_tstamp_types; i++) { + tstamp_type_name = pcap_tstamp_type_val_to_name(tstamp_types[i]); + if (tstamp_type_name != NULL) { + (void) fprintf(stderr, " %s (%s)\n", tstamp_type_name, + pcap_tstamp_type_val_to_description(tstamp_types[i])); + } else { + (void) fprintf(stderr, " %d\n", tstamp_types[i]); + } + } + pcap_free_tstamp_types(tstamp_types); + exit(0); +} +#endif + +static void +show_dlts_and_exit(const char *device, pcap_t *pd) +{ + int n_dlts; + int *dlts = 0; + const char *dlt_name; + + n_dlts = pcap_list_datalinks(pd, &dlts); + if (n_dlts < 0) + error("%s", pcap_geterr(pd)); + else if (n_dlts == 0 || !dlts) + error("No data link types."); + + /* + * If the interface is known to support monitor mode, indicate + * whether these are the data link types available when not in + * monitor mode, if -I wasn't specified, or when in monitor mode, + * when -I was specified (the link-layer types available in + * monitor mode might be different from the ones available when + * not in monitor mode). + */ + if (supports_monitor_mode) + (void) fprintf(stderr, "Data link types for %s %s (use option -y to set):\n", + device, + Iflag ? "when in monitor mode" : "when not in monitor mode"); + else + (void) fprintf(stderr, "Data link types for %s (use option -y to set):\n", + device); + + while (--n_dlts >= 0) { + dlt_name = pcap_datalink_val_to_name(dlts[n_dlts]); + if (dlt_name != NULL) { + (void) fprintf(stderr, " %s (%s)", dlt_name, + pcap_datalink_val_to_description(dlts[n_dlts])); + + /* + * OK, does tcpdump handle that type? + */ + if (lookup_printer(dlts[n_dlts]) == NULL + && lookup_ndo_printer(dlts[n_dlts]) == NULL) + (void) fprintf(stderr, " (printing not supported)"); + fprintf(stderr, "\n"); + } else { + (void) fprintf(stderr, " DLT %d (printing not supported)\n", + dlts[n_dlts]); + } + } +#ifdef HAVE_PCAP_FREE_DATALINKS + pcap_free_datalinks(dlts); +#endif + exit(0); +} + +/* + * Set up flags that might or might not be supported depending on the + * version of libpcap we're using. + */ +#if defined(HAVE_PCAP_CREATE) || defined(WIN32) +#define B_FLAG "B:" +#define B_FLAG_USAGE " [ -B size ]" +#else /* defined(HAVE_PCAP_CREATE) || defined(WIN32) */ +#define B_FLAG +#define B_FLAG_USAGE +#endif /* defined(HAVE_PCAP_CREATE) || defined(WIN32) */ + +#ifdef HAVE_PCAP_CREATE +#define I_FLAG "I" +#else /* HAVE_PCAP_CREATE */ +#define I_FLAG +#endif /* HAVE_PCAP_CREATE */ + +#ifdef HAVE_PCAP_SET_TSTAMP_TYPE +#define j_FLAG "j:" +#define j_FLAG_USAGE " [ -j tstamptype ]" +#define J_FLAG "J" +#else /* PCAP_ERROR_TSTAMP_TYPE_NOTSUP */ +#define j_FLAG +#define j_FLAG_USAGE +#define J_FLAG +#endif /* PCAP_ERROR_TSTAMP_TYPE_NOTSUP */ + +#ifdef HAVE_PCAP_FINDALLDEVS +#ifndef HAVE_PCAP_IF_T +#undef HAVE_PCAP_FINDALLDEVS +#endif +#endif + +#ifdef HAVE_PCAP_FINDALLDEVS +#define D_FLAG "D" +#else +#define D_FLAG +#endif + +#ifdef HAVE_PCAP_DUMP_FLUSH +#define U_FLAG "U" +#else +#define U_FLAG +#endif + +#ifndef WIN32 +/* Drop root privileges and chroot if necessary */ +static void +droproot(const char *username, const char *chroot_dir) +{ + struct passwd *pw = NULL; + + if (chroot_dir && !username) { + fprintf(stderr, "tcpdump: Chroot without dropping root is insecure\n"); + exit(1); + } + + pw = getpwnam(username); + if (pw) { + if (chroot_dir) { + if (chroot(chroot_dir) != 0 || chdir ("/") != 0) { + fprintf(stderr, "tcpdump: Couldn't chroot/chdir to '%.64s': %s\n", + chroot_dir, pcap_strerror(errno)); + exit(1); + } + } +#ifdef HAVE_CAP_NG_H + int ret = capng_change_id(pw->pw_uid, pw->pw_gid, CAPNG_NO_FLAG); + if (ret < 0) { + printf("error : ret %d\n", ret); + } + /* We don't need CAP_SETUID and CAP_SETGID */ + capng_update(CAPNG_DROP, CAPNG_EFFECTIVE, CAP_SETUID); + capng_update(CAPNG_DROP, CAPNG_EFFECTIVE, CAP_SETUID); + capng_update(CAPNG_DROP, CAPNG_PERMITTED, CAP_SETUID); + capng_update(CAPNG_DROP, CAPNG_PERMITTED, CAP_SETUID); + capng_apply(CAPNG_SELECT_BOTH); + +#else +#ifndef __rtems__ + if (initgroups(pw->pw_name, pw->pw_gid) != 0 || + setgid(pw->pw_gid) != 0 || setuid(pw->pw_uid) != 0) { + fprintf(stderr, "tcpdump: Couldn't change to '%.32s' uid=%lu gid=%lu: %s\n", + username, + (unsigned long)pw->pw_uid, + (unsigned long)pw->pw_gid, + pcap_strerror(errno)); + exit(1); + } +#endif +#endif /* HAVE_CAP_NG_H */ + } + else { + fprintf(stderr, "tcpdump: Couldn't find user '%.32s'\n", + username); + exit(1); + } +} +#endif /* WIN32 */ + +static int +getWflagChars(int x) +{ + int c = 0; + + x -= 1; + while (x > 0) { + c += 1; + x /= 10; + } + + return c; +} + + +static void +MakeFilename(char *buffer, char *orig_name, int cnt, int max_chars) +{ + char *filename = malloc(PATH_MAX + 1); + if (filename == NULL) + error("Makefilename: malloc"); + + /* Process with strftime if Gflag is set. */ + if (Gflag != 0) { + struct tm *local_tm; + + /* Convert Gflag_time to a usable format */ + if ((local_tm = localtime(&Gflag_time)) == NULL) { + error("MakeTimedFilename: localtime"); + } + + /* There's no good way to detect an error in strftime since a return + * value of 0 isn't necessarily failure. + */ + strftime(filename, PATH_MAX, orig_name, local_tm); + } else { + strncpy(filename, orig_name, PATH_MAX); + } + + if (cnt == 0 && max_chars == 0) + strncpy(buffer, filename, PATH_MAX + 1); + else + if (snprintf(buffer, PATH_MAX + 1, "%s%0*d", filename, max_chars, cnt) > PATH_MAX) + /* Report an error if the filename is too large */ + error("too many output files or filename is too long (> %d)", PATH_MAX); + free(filename); +} + +static int tcpdump_printf(netdissect_options *ndo _U_, + const char *fmt, ...) +{ + + va_list args; + int ret; + + va_start(args, fmt); + ret=vfprintf(stdout, fmt, args); + va_end(args); + + return ret; +} + +static struct print_info +get_print_info(int type) +{ + struct print_info printinfo; + + printinfo.ndo_type = 1; + printinfo.ndo = gndo; + printinfo.p.ndo_printer = lookup_ndo_printer(type); + if (printinfo.p.ndo_printer == NULL) { + printinfo.p.printer = lookup_printer(type); + printinfo.ndo_type = 0; + if (printinfo.p.printer == NULL) { + gndo->ndo_dltname = pcap_datalink_val_to_name(type); + if (gndo->ndo_dltname != NULL) + error("packet printing is not supported for link type %s: use -w", + gndo->ndo_dltname); + else + error("packet printing is not supported for link type %d: use -w", type); + } + } + return (printinfo); +} + +static char * +get_next_file(FILE *VFile, char *ptr) +{ + char *ret; + + ret = fgets(ptr, PATH_MAX, VFile); + if (!ret) + return NULL; + + if (ptr[strlen(ptr) - 1] == '\n') + ptr[strlen(ptr) - 1] = '\0'; + + return ret; +} + +#ifdef __rtems__ +static int main(int argc, char **argv); + +int rtems_bsd_command_tcpdump(int argc, char *argv[]) +{ + int exit_code; + + rtems_bsd_program_lock(); + + dflag = 0; + Lflag = 0; +#ifdef HAVE_PCAP_SET_TSTAMP_TYPE + Jflag = 0; +#endif + zflag = NULL; + infodelay = 0; + infoprint = 0; + program_name = NULL; + thiszone = 0; + packets_captured = 0; + pd = 0; + supports_monitor_mode = 0; + + exit_code = rtems_bsd_program_call_main("tcpdump", main, argc, argv); + + rtems_bsd_program_unlock(); + + return exit_code; +} +#endif /* __rtems__ */ +int +#ifndef __rtems__ +main(int argc, char *const *argv) +#else /* __rtems__ */ +main(int argc, char **argv) +#endif /* __rtems__ */ +{ + register int cnt, op, i; + bpf_u_int32 localnet, netmask; + register char *cp, *infile, *cmdbuf, *device, *RFileName, *VFileName, *WFileName; + pcap_handler callback; + int type; + int dlt; + int new_dlt; + const char *dlt_name; + struct bpf_program fcode; +#ifndef WIN32 + RETSIGTYPE (*oldhandler)(int); +#endif + struct print_info printinfo; + struct dump_info dumpinfo; + u_char *pcap_userdata; + char ebuf[PCAP_ERRBUF_SIZE]; + char VFileLine[PATH_MAX + 1]; + char *username = NULL; + char *chroot_dir = NULL; + char *ret = NULL; + char *end; +#ifdef HAVE_PCAP_FINDALLDEVS + pcap_if_t *devpointer; + int devnum; +#endif + int status; + FILE *VFile; +#ifdef __rtems__ + struct getopt_data getopt_data; + memset(&getopt_data, 0, sizeof(getopt_data)); +#endif +#ifdef WIN32 + if(wsockinit() != 0) return 1; +#endif /* WIN32 */ + + jflag=-1; /* not set */ + gndo->ndo_Oflag=1; + gndo->ndo_Rflag=1; + gndo->ndo_dlt=-1; + gndo->ndo_default_print=ndo_default_print; + gndo->ndo_printf=tcpdump_printf; + gndo->ndo_error=ndo_error; + gndo->ndo_warning=ndo_warning; + gndo->ndo_snaplen = DEFAULT_SNAPLEN; + + cnt = -1; + device = NULL; + infile = NULL; + RFileName = NULL; + VFileName = NULL; + VFile = NULL; + WFileName = NULL; + dlt = -1; + if ((cp = strrchr(argv[0], '/')) != NULL) + program_name = cp + 1; + else + program_name = argv[0]; + + if (abort_on_misalignment(ebuf, sizeof(ebuf)) < 0) + error("%s", ebuf); + +#ifdef LIBSMI + smiInit("tcpdump"); +#endif + + while ( + (op = getopt(argc, argv, "aAb" B_FLAG "c:C:d" D_FLAG "eE:fF:G:hHi:" I_FLAG j_FLAG J_FLAG "KlLm:M:nNOpqr:Rs:StT:u" U_FLAG "V:vw:W:xXy:Yz:Z:")) != -1) + switch (op) { + + case 'a': + /* compatibility for old -a */ + break; + + case 'A': + ++Aflag; + break; + + case 'b': + ++bflag; + break; + +#if defined(HAVE_PCAP_CREATE) || defined(WIN32) + case 'B': + Bflag = atoi(optarg)*1024; + if (Bflag <= 0) + error("invalid packet buffer size %s", optarg); + break; +#endif /* defined(HAVE_PCAP_CREATE) || defined(WIN32) */ + + case 'c': + cnt = atoi(optarg); + if (cnt <= 0) + error("invalid packet count %s", optarg); + break; + + case 'C': + Cflag = atoi(optarg) * 1000000; + if (Cflag < 0) + error("invalid file size %s", optarg); + break; + + case 'd': + ++dflag; + break; + +#ifdef HAVE_PCAP_FINDALLDEVS + case 'D': + if (pcap_findalldevs(&devpointer, ebuf) < 0) + error("%s", ebuf); + else { + for (i = 0; devpointer != 0; i++) { + printf("%d.%s", i+1, devpointer->name); + if (devpointer->description != NULL) + printf(" (%s)", devpointer->description); + printf("\n"); + devpointer = devpointer->next; + } + } + return 0; +#endif /* HAVE_PCAP_FINDALLDEVS */ + + case 'L': + Lflag++; + break; + + case 'e': + ++eflag; + break; + + case 'E': +#ifndef HAVE_LIBCRYPTO + warning("crypto code not compiled in"); +#endif + gndo->ndo_espsecret = optarg; + break; + + case 'f': + ++fflag; + break; + + case 'F': + infile = optarg; + break; + + case 'G': + Gflag = atoi(optarg); + if (Gflag < 0) + error("invalid number of seconds %s", optarg); + + /* We will create one file initially. */ + Gflag_count = 0; + + /* Grab the current time for rotation use. */ + if ((Gflag_time = time(NULL)) == (time_t)-1) { + error("main: can't get current time: %s", + pcap_strerror(errno)); + } + break; + + case 'h': + usage(); + break; + + case 'H': + ++Hflag; + break; + + case 'i': + if (optarg[0] == '0' && optarg[1] == 0) + error("Invalid adapter index"); + +#ifdef HAVE_PCAP_FINDALLDEVS + /* + * If the argument is a number, treat it as + * an index into the list of adapters, as + * printed by "tcpdump -D". + * + * This should be OK on UNIX systems, as interfaces + * shouldn't have names that begin with digits. + * It can be useful on Windows, where more than + * one interface can have the same name. + */ + devnum = strtol(optarg, &end, 10); + if (optarg != end && *end == '\0') { + if (devnum < 0) + error("Invalid adapter index"); + + if (pcap_findalldevs(&devpointer, ebuf) < 0) + error("%s", ebuf); + else { + /* + * Look for the devnum-th entry + * in the list of devices + * (1-based). + */ + for (i = 0; + i < devnum-1 && devpointer != NULL; + i++, devpointer = devpointer->next) + ; + if (devpointer == NULL) + error("Invalid adapter index"); + } + device = devpointer->name; + break; + } +#endif /* HAVE_PCAP_FINDALLDEVS */ + device = optarg; + break; + +#ifdef HAVE_PCAP_CREATE + case 'I': + ++Iflag; + break; +#endif /* HAVE_PCAP_CREATE */ + +#ifdef HAVE_PCAP_SET_TSTAMP_TYPE + case 'j': + jflag = pcap_tstamp_type_name_to_val(optarg); + if (jflag < 0) + error("invalid time stamp type %s", optarg); + break; + + case 'J': + Jflag++; + break; +#endif + + case 'l': +#ifdef WIN32 + /* + * _IOLBF is the same as _IOFBF in Microsoft's C + * libraries; the only alternative they offer + * is _IONBF. + * + * XXX - this should really be checking for MSVC++, + * not WIN32, if, for example, MinGW has its own + * C library that is more UNIX-compatible. + */ + setvbuf(stdout, NULL, _IONBF, 0); +#else /* WIN32 */ +#ifdef HAVE_SETLINEBUF + setlinebuf(stdout); +#else + setvbuf(stdout, NULL, _IOLBF, 0); +#endif +#endif /* WIN32 */ + break; + + case 'K': + ++Kflag; + break; + + case 'm': +#ifdef LIBSMI + if (smiLoadModule(optarg) == 0) { + error("could not load MIB module %s", optarg); + } + sflag = 1; +#else + (void)fprintf(stderr, "%s: ignoring option `-m %s' ", + program_name, optarg); + (void)fprintf(stderr, "(no libsmi support)\n"); +#endif + break; + + case 'M': + /* TCP-MD5 shared secret */ +#ifndef HAVE_LIBCRYPTO + warning("crypto code not compiled in"); +#endif + sigsecret = optarg; + break; + + case 'n': + ++nflag; + break; + + case 'N': + ++Nflag; + break; + + case 'O': + Oflag = 0; + break; + + case 'p': + ++pflag; + break; + + case 'q': + ++qflag; + ++suppress_default_print; + break; + + case 'r': + RFileName = optarg; + break; + + case 'R': + Rflag = 0; + break; + + case 's': + snaplen = strtol(optarg, &end, 0); + if (optarg == end || *end != '\0' + || snaplen < 0 || snaplen > MAXIMUM_SNAPLEN) + error("invalid snaplen %s", optarg); + else if (snaplen == 0) + snaplen = MAXIMUM_SNAPLEN; + break; + + case 'S': + ++Sflag; + break; + + case 't': + ++tflag; + break; + + case 'T': + if (strcasecmp(optarg, "vat") == 0) + packettype = PT_VAT; + else if (strcasecmp(optarg, "wb") == 0) + packettype = PT_WB; + else if (strcasecmp(optarg, "rpc") == 0) + packettype = PT_RPC; + else if (strcasecmp(optarg, "rtp") == 0) + packettype = PT_RTP; + else if (strcasecmp(optarg, "rtcp") == 0) + packettype = PT_RTCP; + else if (strcasecmp(optarg, "snmp") == 0) + packettype = PT_SNMP; + else if (strcasecmp(optarg, "cnfp") == 0) + packettype = PT_CNFP; + else if (strcasecmp(optarg, "tftp") == 0) + packettype = PT_TFTP; + else if (strcasecmp(optarg, "aodv") == 0) + packettype = PT_AODV; + else if (strcasecmp(optarg, "carp") == 0) + packettype = PT_CARP; + else if (strcasecmp(optarg, "radius") == 0) + packettype = PT_RADIUS; + else if (strcasecmp(optarg, "zmtp1") == 0) + packettype = PT_ZMTP1; + else if (strcasecmp(optarg, "vxlan") == 0) + packettype = PT_VXLAN; + else + error("unknown packet type `%s'", optarg); + break; + + case 'u': + ++uflag; + break; + +#ifdef HAVE_PCAP_DUMP_FLUSH + case 'U': + ++Uflag; + break; +#endif + + case 'v': + ++vflag; + break; + + case 'V': + VFileName = optarg; + break; + + case 'w': + WFileName = optarg; + break; + + case 'W': + Wflag = atoi(optarg); + if (Wflag < 0) + error("invalid number of output files %s", optarg); + WflagChars = getWflagChars(Wflag); + break; + + case 'x': + ++xflag; + ++suppress_default_print; + break; + + case 'X': + ++Xflag; + ++suppress_default_print; + break; + + case 'y': + gndo->ndo_dltname = optarg; + gndo->ndo_dlt = + pcap_datalink_name_to_val(gndo->ndo_dltname); + if (gndo->ndo_dlt < 0) + error("invalid data link type %s", gndo->ndo_dltname); + break; + +#if defined(HAVE_PCAP_DEBUG) || defined(HAVE_YYDEBUG) + case 'Y': + { + /* Undocumented flag */ +#ifdef HAVE_PCAP_DEBUG + extern int pcap_debug; + pcap_debug = 1; +#else + extern int yydebug; + yydebug = 1; +#endif + } + break; +#endif + case 'z': + if (optarg) { + zflag = strdup(optarg); + } else { + usage(); + /* NOTREACHED */ + } + break; + + case 'Z': + if (optarg) { + username = strdup(optarg); + } + else { + usage(); + /* NOTREACHED */ + } + break; + + default: + usage(); + /* NOTREACHED */ + } + + switch (tflag) { + + case 0: /* Default */ + case 4: /* Default + Date*/ + thiszone = gmt2local(0); + break; + + case 1: /* No time stamp */ + case 2: /* Unix timeval style */ + case 3: /* Microseconds since previous packet */ + case 5: /* Microseconds since first packet */ + break; + + default: /* Not supported */ + error("only -t, -tt, -ttt, -tttt and -ttttt are supported"); + break; + } + + if (fflag != 0 && (VFileName != NULL || RFileName != NULL)) + error("-f can not be used with -V or -r"); + + if (VFileName != NULL && RFileName != NULL) + error("-V and -r are mutually exclusive."); + +#ifdef WITH_CHROOT + /* if run as root, prepare for chrooting */ + if (getuid() == 0 || geteuid() == 0) { + /* future extensibility for cmd-line arguments */ + if (!chroot_dir) + chroot_dir = WITH_CHROOT; + } +#endif + +#ifdef WITH_USER + /* if run as root, prepare for dropping root privileges */ + if (getuid() == 0 || geteuid() == 0) { + /* Run with '-Z root' to restore old behaviour */ + if (!username) + username = WITH_USER; + } +#endif + + if (RFileName != NULL || VFileName != NULL) { + /* + * If RFileName is non-null, it's the pathname of a + * savefile to read. If VFileName is non-null, it's + * the pathname of a file containing a list of pathnames + * (one per line) of savefiles to read. + * + * In either case, we're reading a savefile, not doing + * a live capture. + */ +#ifndef WIN32 + /* + * We don't need network access, so relinquish any set-UID + * or set-GID privileges we have (if any). + * + * We do *not* want set-UID privileges when opening a + * trace file, as that might let the user read other + * people's trace files (especially if we're set-UID + * root). + */ + if (setgid(getgid()) != 0 || setuid(getuid()) != 0 ) + fprintf(stderr, "Warning: setgid/setuid failed !\n"); +#endif /* WIN32 */ + if (VFileName != NULL) { + if (VFileName[0] == '-' && VFileName[1] == '\0') + VFile = stdin; + else + VFile = fopen(VFileName, "r"); + + if (VFile == NULL) + error("Unable to open file: %s\n", strerror(errno)); + + ret = get_next_file(VFile, VFileLine); + if (!ret) + error("Nothing in %s\n", VFileName); + RFileName = VFileLine; + } + + pd = pcap_open_offline(RFileName, ebuf); + if (pd == NULL) + error("%s", ebuf); + dlt = pcap_datalink(pd); + dlt_name = pcap_datalink_val_to_name(dlt); + if (dlt_name == NULL) { + fprintf(stderr, "reading from file %s, link-type %u\n", + RFileName, dlt); + } else { + fprintf(stderr, + "reading from file %s, link-type %s (%s)\n", + RFileName, dlt_name, + pcap_datalink_val_to_description(dlt)); + } + localnet = 0; + netmask = 0; + } else { + /* + * We're doing a live capture. + */ + if (device == NULL) { + device = pcap_lookupdev(ebuf); + if (device == NULL) + error("%s", ebuf); + } +#ifdef WIN32 + /* + * Print a message to the standard error on Windows. + * XXX - why do it here, with a different message? + */ + if(strlen(device) == 1) //we assume that an ASCII string is always longer than 1 char + { //a Unicode string has a \0 as second byte (so strlen() is 1) + fprintf(stderr, "%s: listening on %ws\n", program_name, device); + } + else + { + fprintf(stderr, "%s: listening on %s\n", program_name, device); + } + + fflush(stderr); +#endif /* WIN32 */ +#ifdef HAVE_PCAP_CREATE + pd = pcap_create(device, ebuf); + if (pd == NULL) + error("%s", ebuf); +#ifdef HAVE_PCAP_SET_TSTAMP_TYPE + if (Jflag) + show_tstamp_types_and_exit(device, pd); +#endif + /* + * Is this an interface that supports monitor mode? + */ + if (pcap_can_set_rfmon(pd) == 1) + supports_monitor_mode = 1; + else + supports_monitor_mode = 0; + status = pcap_set_snaplen(pd, snaplen); + if (status != 0) + error("%s: Can't set snapshot length: %s", + device, pcap_statustostr(status)); + status = pcap_set_promisc(pd, !pflag); + if (status != 0) + error("%s: Can't set promiscuous mode: %s", + device, pcap_statustostr(status)); + if (Iflag) { + status = pcap_set_rfmon(pd, 1); + if (status != 0) + error("%s: Can't set monitor mode: %s", + device, pcap_statustostr(status)); + } + status = pcap_set_timeout(pd, 1000); + if (status != 0) + error("%s: pcap_set_timeout failed: %s", + device, pcap_statustostr(status)); + if (Bflag != 0) { + status = pcap_set_buffer_size(pd, Bflag); + if (status != 0) + error("%s: Can't set buffer size: %s", + device, pcap_statustostr(status)); + } +#ifdef HAVE_PCAP_SET_TSTAMP_TYPE + if (jflag != -1) { + status = pcap_set_tstamp_type(pd, jflag); + if (status < 0) + error("%s: Can't set time stamp type: %s", + device, pcap_statustostr(status)); + } +#endif + status = pcap_activate(pd); + if (status < 0) { + /* + * pcap_activate() failed. + */ + cp = pcap_geterr(pd); + if (status == PCAP_ERROR) + error("%s", cp); + else if ((status == PCAP_ERROR_NO_SUCH_DEVICE || + status == PCAP_ERROR_PERM_DENIED) && + *cp != '\0') + error("%s: %s\n(%s)", device, + pcap_statustostr(status), cp); + else + error("%s: %s", device, + pcap_statustostr(status)); + } else if (status > 0) { + /* + * pcap_activate() succeeded, but it's warning us + * of a problem it had. + */ + cp = pcap_geterr(pd); + if (status == PCAP_WARNING) + warning("%s", cp); + else if (status == PCAP_WARNING_PROMISC_NOTSUP && + *cp != '\0') + warning("%s: %s\n(%s)", device, + pcap_statustostr(status), cp); + else + warning("%s: %s", device, + pcap_statustostr(status)); + } +#else + *ebuf = '\0'; + pd = pcap_open_live(device, snaplen, !pflag, 1000, ebuf); + if (pd == NULL) + error("%s", ebuf); + else if (*ebuf) + warning("%s", ebuf); +#endif /* HAVE_PCAP_CREATE */ + /* + * Let user own process after socket has been opened. + */ +#ifndef WIN32 + if (setgid(getgid()) != 0 || setuid(getuid()) != 0) + fprintf(stderr, "Warning: setgid/setuid failed !\n"); +#endif /* WIN32 */ +#if !defined(HAVE_PCAP_CREATE) && defined(WIN32) + if(Bflag != 0) + if(pcap_setbuff(pd, Bflag)==-1){ + error("%s", pcap_geterr(pd)); + } +#endif /* !defined(HAVE_PCAP_CREATE) && defined(WIN32) */ + if (Lflag) + show_dlts_and_exit(device, pd); + if (gndo->ndo_dlt >= 0) { +#ifdef HAVE_PCAP_SET_DATALINK + if (pcap_set_datalink(pd, gndo->ndo_dlt) < 0) + error("%s", pcap_geterr(pd)); +#else + /* + * We don't actually support changing the + * data link type, so we only let them + * set it to what it already is. + */ + if (gndo->ndo_dlt != pcap_datalink(pd)) { + error("%s is not one of the DLTs supported by this device\n", + gndo->ndo_dltname); + } +#endif + (void)fprintf(stderr, "%s: data link type %s\n", + program_name, gndo->ndo_dltname); + (void)fflush(stderr); + } + i = pcap_snapshot(pd); + if (snaplen < i) { + warning("snaplen raised from %d to %d", snaplen, i); + snaplen = i; + } + if (pcap_lookupnet(device, &localnet, &netmask, ebuf) < 0) { + localnet = 0; + netmask = 0; + warning("%s", ebuf); + } + } + if (infile) + cmdbuf = read_infile(infile); + else + cmdbuf = copy_argv(&argv[optind]); + + if (pcap_compile(pd, &fcode, cmdbuf, Oflag, netmask) < 0) + error("%s", pcap_geterr(pd)); + if (dflag) { + bpf_dump(&fcode, dflag); + pcap_close(pd); + free(cmdbuf); + exit(0); + } + init_addrtoname(localnet, netmask); + init_checksum(); + +#ifndef WIN32 + (void)setsignal(SIGPIPE, cleanup); + (void)setsignal(SIGTERM, cleanup); + (void)setsignal(SIGINT, cleanup); +#endif /* WIN32 */ +#if defined(HAVE_FORK) || defined(HAVE_VFORK) + (void)setsignal(SIGCHLD, child_cleanup); +#endif + /* Cooperate with nohup(1) */ +#ifndef WIN32 + if ((oldhandler = setsignal(SIGHUP, cleanup)) != SIG_DFL) + (void)setsignal(SIGHUP, oldhandler); +#endif /* WIN32 */ + +#ifndef WIN32 + /* + * If a user name was specified with "-Z", attempt to switch to + * that user's UID. This would probably be used with sudo, + * to allow tcpdump to be run in a special restricted + * account (if you just want to allow users to open capture + * devices, and can't just give users that permission, + * you'd make tcpdump set-UID or set-GID). + * + * Tcpdump doesn't necessarily write only to one savefile; + * the general only way to allow a -Z instance to write to + * savefiles as the user under whose UID it's run, rather + * than as the user specified with -Z, would thus be to switch + * to the original user ID before opening a capture file and + * then switch back to the -Z user ID after opening the savefile. + * Switching to the -Z user ID only after opening the first + * savefile doesn't handle the general case. + */ + +#ifdef HAVE_CAP_NG_H + /* We are running as root and we will be writing to savefile */ + if ((getuid() == 0 || geteuid() == 0) && WFileName) { + if (username) { + /* Drop all capabilities from effective set */ + capng_clear(CAPNG_EFFECTIVE); + /* Add capabilities we will need*/ + capng_update(CAPNG_ADD, CAPNG_PERMITTED, CAP_SETUID); + capng_update(CAPNG_ADD, CAPNG_PERMITTED, CAP_SETGID); + capng_update(CAPNG_ADD, CAPNG_PERMITTED, CAP_DAC_OVERRIDE); + + capng_update(CAPNG_ADD, CAPNG_EFFECTIVE, CAP_SETUID); + capng_update(CAPNG_ADD, CAPNG_EFFECTIVE, CAP_SETGID); + capng_update(CAPNG_ADD, CAPNG_EFFECTIVE, CAP_DAC_OVERRIDE); + + capng_apply(CAPNG_SELECT_BOTH); + } + } +#endif /* HAVE_CAP_NG_H */ + + if (getuid() == 0 || geteuid() == 0) { + if (username || chroot_dir) + droproot(username, chroot_dir); + + } +#endif /* WIN32 */ + + if (pcap_setfilter(pd, &fcode) < 0) + error("%s", pcap_geterr(pd)); + if (WFileName) { + pcap_dumper_t *p; + /* Do not exceed the default PATH_MAX for files. */ + dumpinfo.CurrentFileName = (char *)malloc(PATH_MAX + 1); + + if (dumpinfo.CurrentFileName == NULL) + error("malloc of dumpinfo.CurrentFileName"); + + /* We do not need numbering for dumpfiles if Cflag isn't set. */ + if (Cflag != 0) + MakeFilename(dumpinfo.CurrentFileName, WFileName, 0, WflagChars); + else + MakeFilename(dumpinfo.CurrentFileName, WFileName, 0, 0); + + p = pcap_dump_open(pd, dumpinfo.CurrentFileName); +#ifdef HAVE_CAP_NG_H + /* Give up capabilities, clear Effective set */ + capng_clear(CAPNG_EFFECTIVE); +#endif + if (p == NULL) + error("%s", pcap_geterr(pd)); + if (Cflag != 0 || Gflag != 0) { + callback = dump_packet_and_trunc; + dumpinfo.WFileName = WFileName; + dumpinfo.pd = pd; + dumpinfo.p = p; + pcap_userdata = (u_char *)&dumpinfo; + } else { + callback = dump_packet; + pcap_userdata = (u_char *)p; + } +#ifdef HAVE_PCAP_DUMP_FLUSH + if (Uflag) + pcap_dump_flush(p); +#endif + } else { + type = pcap_datalink(pd); + printinfo = get_print_info(type); + callback = print_packet; + pcap_userdata = (u_char *)&printinfo; + } + +#ifdef SIGNAL_REQ_INFO + /* + * We can't get statistics when reading from a file rather + * than capturing from a device. + */ + if (RFileName == NULL) + (void)setsignal(SIGNAL_REQ_INFO, requestinfo); +#endif + + if (vflag > 0 && WFileName) { + /* + * When capturing to a file, "-v" means tcpdump should, + * every 10 secodns, "v"erbosely report the number of + * packets captured. + */ +#ifdef USE_WIN32_MM_TIMER + /* call verbose_stats_dump() each 1000 +/-100msec */ + timer_id = timeSetEvent(1000, 100, verbose_stats_dump, 0, TIME_PERIODIC); + setvbuf(stderr, NULL, _IONBF, 0); +#elif defined(HAVE_ALARM) + (void)setsignal(SIGALRM, verbose_stats_dump); + alarm(1); +#endif + } + +#ifndef WIN32 + if (RFileName == NULL) { + /* + * Live capture (if -V was specified, we set RFileName + * to a file from the -V file). Print a message to + * the standard error on UN*X. + */ + if (!vflag && !WFileName) { + (void)fprintf(stderr, + "%s: verbose output suppressed, use -v or -vv for full protocol decode\n", + program_name); + } else + (void)fprintf(stderr, "%s: ", program_name); + dlt = pcap_datalink(pd); + dlt_name = pcap_datalink_val_to_name(dlt); + if (dlt_name == NULL) { + (void)fprintf(stderr, "listening on %s, link-type %u, capture size %u bytes\n", + device, dlt, snaplen); + } else { + (void)fprintf(stderr, "listening on %s, link-type %s (%s), capture size %u bytes\n", + device, dlt_name, + pcap_datalink_val_to_description(dlt), snaplen); + } + (void)fflush(stderr); + } +#endif /* WIN32 */ + do { + status = pcap_loop(pd, cnt, callback, pcap_userdata); + if (WFileName == NULL) { + /* + * We're printing packets. Flush the printed output, + * so it doesn't get intermingled with error output. + */ + if (status == -2) { + /* + * We got interrupted, so perhaps we didn't + * manage to finish a line we were printing. + * Print an extra newline, just in case. + */ + putchar('\n'); + } + (void)fflush(stdout); + } + if (status == -1) { + /* + * Error. Report it. + */ + (void)fprintf(stderr, "%s: pcap_loop: %s\n", + program_name, pcap_geterr(pd)); + } + if (RFileName == NULL) { + /* + * We're doing a live capture. Report the capture + * statistics. + */ + info(1); + } + pcap_close(pd); + if (VFileName != NULL) { + ret = get_next_file(VFile, VFileLine); + if (ret) { + RFileName = VFileLine; + pd = pcap_open_offline(RFileName, ebuf); + if (pd == NULL) + error("%s", ebuf); + new_dlt = pcap_datalink(pd); + if (WFileName && new_dlt != dlt) + error("%s: new dlt does not match original", RFileName); + printinfo = get_print_info(new_dlt); + dlt_name = pcap_datalink_val_to_name(new_dlt); + if (dlt_name == NULL) { + fprintf(stderr, "reading from file %s, link-type %u\n", + RFileName, new_dlt); + } else { + fprintf(stderr, + "reading from file %s, link-type %s (%s)\n", + RFileName, dlt_name, + pcap_datalink_val_to_description(new_dlt)); + } + if (pcap_compile(pd, &fcode, cmdbuf, Oflag, netmask) < 0) + error("%s", pcap_geterr(pd)); + if (pcap_setfilter(pd, &fcode) < 0) + error("%s", pcap_geterr(pd)); + } + } + } + while (ret != NULL); + + free(cmdbuf); + exit(status == -1 ? 1 : 0); +} + +/* make a clean exit on interrupts */ +static RETSIGTYPE +cleanup(int signo _U_) +{ +#ifdef USE_WIN32_MM_TIMER + if (timer_id) + timeKillEvent(timer_id); + timer_id = 0; +#elif defined(HAVE_ALARM) + alarm(0); +#endif + +#ifdef HAVE_PCAP_BREAKLOOP + /* + * We have "pcap_breakloop()"; use it, so that we do as little + * as possible in the signal handler (it's probably not safe + * to do anything with standard I/O streams in a signal handler - + * the ANSI C standard doesn't say it is). + */ + pcap_breakloop(pd); +#else + /* + * We don't have "pcap_breakloop()"; this isn't safe, but + * it's the best we can do. Print the summary if we're + * not reading from a savefile - i.e., if we're doing a + * live capture - and exit. + */ + if (pd != NULL && pcap_file(pd) == NULL) { + /* + * We got interrupted, so perhaps we didn't + * manage to finish a line we were printing. + * Print an extra newline, just in case. + */ + putchar('\n'); + (void)fflush(stdout); + info(1); + } + exit(0); +#endif +} + +/* + On windows, we do not use a fork, so we do not care less about + waiting a child processes to die + */ +#if defined(HAVE_FORK) || defined(HAVE_VFORK) +static RETSIGTYPE +child_cleanup(int signo _U_) +{ + wait(NULL); +} +#endif /* HAVE_FORK && HAVE_VFORK */ + +static void +info(register int verbose) +{ + struct pcap_stat stat; + + /* + * Older versions of libpcap didn't set ps_ifdrop on some + * platforms; initialize it to 0 to handle that. + */ + stat.ps_ifdrop = 0; + if (pcap_stats(pd, &stat) < 0) { + (void)fprintf(stderr, "pcap_stats: %s\n", pcap_geterr(pd)); + infoprint = 0; + return; + } + + if (!verbose) + fprintf(stderr, "%s: ", program_name); + + (void)fprintf(stderr, "%u packet%s captured", packets_captured, + PLURAL_SUFFIX(packets_captured)); + if (!verbose) + fputs(", ", stderr); + else + putc('\n', stderr); + (void)fprintf(stderr, "%u packet%s received by filter", stat.ps_recv, + PLURAL_SUFFIX(stat.ps_recv)); + if (!verbose) + fputs(", ", stderr); + else + putc('\n', stderr); + (void)fprintf(stderr, "%u packet%s dropped by kernel", stat.ps_drop, + PLURAL_SUFFIX(stat.ps_drop)); + if (stat.ps_ifdrop != 0) { + if (!verbose) + fputs(", ", stderr); + else + putc('\n', stderr); + (void)fprintf(stderr, "%u packet%s dropped by interface\n", + stat.ps_ifdrop, PLURAL_SUFFIX(stat.ps_ifdrop)); + } else + putc('\n', stderr); + infoprint = 0; +} + +#if defined(HAVE_FORK) || defined(HAVE_VFORK) +static void +compress_savefile(const char *filename) +{ +# ifdef HAVE_FORK + if (fork()) +# else + if (vfork()) +# endif + return; + /* + * Set to lowest priority so that this doesn't disturb the capture + */ +#ifdef NZERO + setpriority(PRIO_PROCESS, 0, NZERO - 1); +#else + setpriority(PRIO_PROCESS, 0, 19); +#endif + if (execlp(zflag, zflag, filename, (char *)NULL) == -1) + fprintf(stderr, + "compress_savefile:execlp(%s, %s): %s\n", + zflag, + filename, + strerror(errno)); +# ifdef HAVE_FORK + exit(1); +# else + _exit(1); +# endif +} +#else /* HAVE_FORK && HAVE_VFORK */ +static void +compress_savefile(const char *filename) +{ + fprintf(stderr, + "compress_savefile failed. Functionality not implemented under your system\n"); +} +#endif /* HAVE_FORK && HAVE_VFORK */ + +static void +dump_packet_and_trunc(u_char *user, const struct pcap_pkthdr *h, const u_char *sp) +{ + struct dump_info *dump_info; + + ++packets_captured; + + ++infodelay; + + dump_info = (struct dump_info *)user; + + /* + * XXX - this won't force the file to rotate on the specified time + * boundary, but it will rotate on the first packet received after the + * specified Gflag number of seconds. Note: if a Gflag time boundary + * and a Cflag size boundary coincide, the time rotation will occur + * first thereby cancelling the Cflag boundary (since the file should + * be 0). + */ + if (Gflag != 0) { + /* Check if it is time to rotate */ + time_t t; + + /* Get the current time */ + if ((t = time(NULL)) == (time_t)-1) { + error("dump_and_trunc_packet: can't get current_time: %s", + pcap_strerror(errno)); + } + + + /* If the time is greater than the specified window, rotate */ + if (t - Gflag_time >= Gflag) { + /* Update the Gflag_time */ + Gflag_time = t; + /* Update Gflag_count */ + Gflag_count++; + /* + * Close the current file and open a new one. + */ + pcap_dump_close(dump_info->p); + + /* + * Compress the file we just closed, if the user asked for it + */ + if (zflag != NULL) + compress_savefile(dump_info->CurrentFileName); + + /* + * Check to see if we've exceeded the Wflag (when + * not using Cflag). + */ + if (Cflag == 0 && Wflag > 0 && Gflag_count >= Wflag) { + (void)fprintf(stderr, "Maximum file limit reached: %d\n", + Wflag); + exit(0); + /* NOTREACHED */ + } + if (dump_info->CurrentFileName != NULL) + free(dump_info->CurrentFileName); + /* Allocate space for max filename + \0. */ + dump_info->CurrentFileName = (char *)malloc(PATH_MAX + 1); + if (dump_info->CurrentFileName == NULL) + error("dump_packet_and_trunc: malloc"); + /* + * This is always the first file in the Cflag + * rotation: e.g. 0 + * We also don't need numbering if Cflag is not set. + */ + if (Cflag != 0) + MakeFilename(dump_info->CurrentFileName, dump_info->WFileName, 0, + WflagChars); + else + MakeFilename(dump_info->CurrentFileName, dump_info->WFileName, 0, 0); + +#ifdef HAVE_CAP_NG_H + capng_update(CAPNG_ADD, CAPNG_EFFECTIVE, CAP_DAC_OVERRIDE); + capng_apply(CAPNG_EFFECTIVE); +#endif /* HAVE_CAP_NG_H */ + dump_info->p = pcap_dump_open(dump_info->pd, dump_info->CurrentFileName); +#ifdef HAVE_CAP_NG_H + capng_update(CAPNG_DROP, CAPNG_EFFECTIVE, CAP_DAC_OVERRIDE); + capng_apply(CAPNG_EFFECTIVE); +#endif /* HAVE_CAP_NG_H */ + if (dump_info->p == NULL) + error("%s", pcap_geterr(pd)); + } + } + + /* + * XXX - this won't prevent capture files from getting + * larger than Cflag - the last packet written to the + * file could put it over Cflag. + */ + if (Cflag != 0 && pcap_dump_ftell(dump_info->p) > Cflag) { + /* + * Close the current file and open a new one. + */ + pcap_dump_close(dump_info->p); + + /* + * Compress the file we just closed, if the user asked for it + */ + if (zflag != NULL) + compress_savefile(dump_info->CurrentFileName); + + Cflag_count++; + if (Wflag > 0) { + if (Cflag_count >= Wflag) + Cflag_count = 0; + } + if (dump_info->CurrentFileName != NULL) + free(dump_info->CurrentFileName); + dump_info->CurrentFileName = (char *)malloc(PATH_MAX + 1); + if (dump_info->CurrentFileName == NULL) + error("dump_packet_and_trunc: malloc"); + MakeFilename(dump_info->CurrentFileName, dump_info->WFileName, Cflag_count, WflagChars); + dump_info->p = pcap_dump_open(dump_info->pd, dump_info->CurrentFileName); + if (dump_info->p == NULL) + error("%s", pcap_geterr(pd)); + } + + pcap_dump((u_char *)dump_info->p, h, sp); +#ifdef HAVE_PCAP_DUMP_FLUSH + if (Uflag) + pcap_dump_flush(dump_info->p); +#endif + + --infodelay; + if (infoprint) + info(0); +} + +static void +dump_packet(u_char *user, const struct pcap_pkthdr *h, const u_char *sp) +{ + ++packets_captured; + + ++infodelay; + + pcap_dump(user, h, sp); +#ifdef HAVE_PCAP_DUMP_FLUSH + if (Uflag) + pcap_dump_flush((pcap_dumper_t *)user); +#endif + + --infodelay; + if (infoprint) + info(0); +} + +static void +print_packet(u_char *user, const struct pcap_pkthdr *h, const u_char *sp) +{ + struct print_info *print_info; + u_int hdrlen; + + ++packets_captured; + + ++infodelay; + ts_print(&h->ts); + + print_info = (struct print_info *)user; + + /* + * Some printers want to check that they're not walking off the + * end of the packet. + * Rather than pass it all the way down, we set this global. + */ + snapend = sp + h->caplen; + + if(print_info->ndo_type) { + hdrlen = (*print_info->p.ndo_printer)(print_info->ndo, h, sp); + } else { + hdrlen = (*print_info->p.printer)(h, sp); + } + + if (Xflag) { + /* + * Print the raw packet data in hex and ASCII. + */ + if (Xflag > 1) { + /* + * Include the link-layer header. + */ + hex_and_ascii_print("\n\t", sp, h->caplen); + } else { + /* + * Don't include the link-layer header - and if + * we have nothing past the link-layer header, + * print nothing. + */ + if (h->caplen > hdrlen) + hex_and_ascii_print("\n\t", sp + hdrlen, + h->caplen - hdrlen); + } + } else if (xflag) { + /* + * Print the raw packet data in hex. + */ + if (xflag > 1) { + /* + * Include the link-layer header. + */ + hex_print("\n\t", sp, h->caplen); + } else { + /* + * Don't include the link-layer header - and if + * we have nothing past the link-layer header, + * print nothing. + */ + if (h->caplen > hdrlen) + hex_print("\n\t", sp + hdrlen, + h->caplen - hdrlen); + } + } else if (Aflag) { + /* + * Print the raw packet data in ASCII. + */ + if (Aflag > 1) { + /* + * Include the link-layer header. + */ + ascii_print(sp, h->caplen); + } else { + /* + * Don't include the link-layer header - and if + * we have nothing past the link-layer header, + * print nothing. + */ + if (h->caplen > hdrlen) + ascii_print(sp + hdrlen, h->caplen - hdrlen); + } + } + + putchar('\n'); + + --infodelay; + if (infoprint) + info(0); +} + +#ifdef WIN32 + /* + * XXX - there should really be libpcap calls to get the version + * number as a string (the string would be generated from #defines + * at run time, so that it's not generated from string constants + * in the library, as, on many UNIX systems, those constants would + * be statically linked into the application executable image, and + * would thus reflect the version of libpcap on the system on + * which the application was *linked*, not the system on which it's + * *running*. + * + * That routine should be documented, unlike the "version[]" + * string, so that UNIX vendors providing their own libpcaps + * don't omit it (as a couple of vendors have...). + * + * Packet.dll should perhaps also export a routine to return the + * version number of the Packet.dll code, to supply the + * "Wpcap_version" information on Windows. + */ + char WDversion[]="current-cvs.tcpdump.org"; +#if !defined(HAVE_GENERATED_VERSION) + char version[]="current-cvs.tcpdump.org"; +#endif + char pcap_version[]="current-cvs.tcpdump.org"; + char Wpcap_version[]="3.1"; +#endif + +/* + * By default, print the specified data out in hex and ASCII. + */ +static void +ndo_default_print(netdissect_options *ndo _U_, const u_char *bp, u_int length) +{ + hex_and_ascii_print("\n\t", bp, length); /* pass on lf and identation string */ +} + +void +default_print(const u_char *bp, u_int length) +{ + ndo_default_print(gndo, bp, length); +} + +#ifdef SIGNAL_REQ_INFO +RETSIGTYPE requestinfo(int signo _U_) +{ + if (infodelay) + ++infoprint; + else + info(0); +} +#endif + +/* + * Called once each second in verbose mode while dumping to file + */ +#ifdef USE_WIN32_MM_TIMER +void CALLBACK verbose_stats_dump (UINT timer_id _U_, UINT msg _U_, DWORD_PTR arg _U_, + DWORD_PTR dw1 _U_, DWORD_PTR dw2 _U_) +{ + struct pcap_stat stat; + + if (infodelay == 0 && pcap_stats(pd, &stat) >= 0) + fprintf(stderr, "Got %u\r", packets_captured); +} +#elif defined(HAVE_ALARM) +static void verbose_stats_dump(int sig _U_) +{ + struct pcap_stat stat; + + if (infodelay == 0 && pcap_stats(pd, &stat) >= 0) + fprintf(stderr, "Got %u\r", packets_captured); + alarm(1); +} +#endif + +static void +usage(void) +{ +#if __rtems__ + #define version "RTEMS Version" +#else + extern char version[]; +#endif +#ifndef HAVE_PCAP_LIB_VERSION +#if defined(WIN32) || defined(HAVE_PCAP_VERSION) + extern char pcap_version[]; +#else /* defined(WIN32) || defined(HAVE_PCAP_VERSION) */ + static char pcap_version[] = "unknown"; +#endif /* defined(WIN32) || defined(HAVE_PCAP_VERSION) */ +#endif /* HAVE_PCAP_LIB_VERSION */ + +#ifdef HAVE_PCAP_LIB_VERSION +#ifdef WIN32 + (void)fprintf(stderr, "%s version %s, based on tcpdump version %s\n", program_name, WDversion, version); +#else /* WIN32 */ + (void)fprintf(stderr, "%s version %s\n", program_name, version); +#endif /* WIN32 */ + (void)fprintf(stderr, "%s\n",pcap_lib_version()); +#else /* HAVE_PCAP_LIB_VERSION */ +#ifdef WIN32 + (void)fprintf(stderr, "%s version %s, based on tcpdump version %s\n", program_name, WDversion, version); + (void)fprintf(stderr, "WinPcap version %s, based on libpcap version %s\n",Wpcap_version, pcap_version); +#else /* WIN32 */ + (void)fprintf(stderr, "%s version %s\n", program_name, version); + (void)fprintf(stderr, "libpcap version %s\n", pcap_version); +#endif /* WIN32 */ +#endif /* HAVE_PCAP_LIB_VERSION */ + (void)fprintf(stderr, +"Usage: %s [-aAbd" D_FLAG "efhH" I_FLAG J_FLAG "KlLnNOpqRStu" U_FLAG "vxX]" B_FLAG_USAGE " [ -c count ]\n", program_name); + (void)fprintf(stderr, +"\t\t[ -C file_size ] [ -E algo:secret ] [ -F file ] [ -G seconds ]\n"); + (void)fprintf(stderr, +"\t\t[ -i interface ]" j_FLAG_USAGE " [ -M secret ]\n"); + (void)fprintf(stderr, +"\t\t[ -r file ] [ -s snaplen ] [ -T type ] [ -V file ] [ -w file ]\n"); + (void)fprintf(stderr, +"\t\t[ -W filecount ] [ -y datalinktype ] [ -z command ]\n"); + (void)fprintf(stderr, +"\t\t[ -Z user ] [ expression ]\n"); + exit(1); +} + + + +/* VARARGS */ +static void +ndo_error(netdissect_options *ndo _U_, const char *fmt, ...) +{ + va_list ap; + + (void)fprintf(stderr, "%s: ", program_name); + va_start(ap, fmt); + (void)vfprintf(stderr, fmt, ap); + va_end(ap); + if (*fmt) { + fmt += strlen(fmt); + if (fmt[-1] != '\n') + (void)fputc('\n', stderr); + } + exit(1); + /* NOTREACHED */ +} + +/* VARARGS */ +static void +ndo_warning(netdissect_options *ndo _U_, const char *fmt, ...) +{ + va_list ap; + + (void)fprintf(stderr, "%s: WARNING: ", program_name); + va_start(ap, fmt); + (void)vfprintf(stderr, fmt, ap); + va_end(ap); + if (*fmt) { + fmt += strlen(fmt); + if (fmt[-1] != '\n') + (void)fputc('\n', stderr); + } +} |