diff options
Diffstat (limited to 'contrib/tcpdump/tcpdump.c')
| -rw-r--r-- | contrib/tcpdump/tcpdump.c | 1461 |
1 files changed, 0 insertions, 1461 deletions
diff --git a/contrib/tcpdump/tcpdump.c b/contrib/tcpdump/tcpdump.c deleted file mode 100644 index caf419e..0000000 --- a/contrib/tcpdump/tcpdump.c +++ /dev/null @@ -1,1461 +0,0 @@ -/* - * 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> - */ - -#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 1.253.2.13 2007/09/12 19:48:51 guy Exp $ (LBL)"; -#endif - -/* - * 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 - -#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> -#ifndef WIN32 -#include <pwd.h> -#include <grp.h> -#include <errno.h> -#endif /* WIN32 */ - -#include "netdissect.h" -#include "interface.h" -#include "addrtoname.h" -#include "machdep.h" -#include "setsignal.h" -#include "gmt2local.h" -#include "pcap-missing.h" - -netdissect_options Gndo; -netdissect_options *gndo = &Gndo; - -/* - * Define the maximum number of files for the -C flag, and how many - * characters can be added to a filename for the -C flag (which - * should be enough to handle MAX_CFLAG - 1). - */ -#define MAX_CFLAG 1000000 -#define MAX_CFLAG_CHARS 6 - -int dflag; /* print filter code */ -int Lflag; /* list available data link types and exit */ - -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 void usage(void) __attribute__((noreturn)); -static void show_dlts_and_exit(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, ...); -static void ndo_warning(netdissect_options *ndo, const char *fmt, ...); - -#ifdef SIGINFO -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; - -typedef u_int (*if_printer)(const struct pcap_pkthdr *, const u_char *); - -struct printer { - if_printer f; - int type; -}; - -static struct printer printers[] = { - { arcnet_if_print, DLT_ARCNET }, -#ifdef DLT_ARCNET_LINUX - { arcnet_linux_if_print, DLT_ARCNET_LINUX }, -#endif - { ether_if_print, DLT_EN10MB }, - { token_if_print, DLT_IEEE802 }, -#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 - { fddi_if_print, DLT_FDDI }, - { null_if_print, DLT_NULL }, -#ifdef DLT_LOOP - { null_if_print, DLT_LOOP }, -#endif - { raw_if_print, DLT_RAW }, - { atm_if_print, DLT_ATM_RFC1483 }, -#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_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 - { NULL, 0 }, -}; - -static 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 */ -} - -static pcap_t *pd; - -extern int optind; -extern int opterr; -extern char *optarg; - -struct print_info { - if_printer printer; -}; - -struct dump_info { - char *WFileName; - pcap_t *pd; - pcap_dumper_t *p; -}; - -static void -show_dlts_and_exit(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."); - - (void) fprintf(stderr, "Data link types (use option -y to set):\n"); - - 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) - (void) fprintf(stderr, " (not supported)"); - putchar('\n'); - } else { - (void) fprintf(stderr, " DLT %d (not supported)\n", - dlts[n_dlts]); - } - } - free(dlts); - exit(0); -} - -/* - * Set up flags that might or might not be supported depending on the - * version of libpcap we're using. - */ -#ifdef WIN32 -#define B_FLAG "B:" -#define B_FLAG_USAGE " [ -B size ]" -#else /* WIN32 */ -#define B_FLAG -#define B_FLAG_USAGE -#endif /* WIN32 */ - -#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); - } - } - 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); - } - } - 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) -{ - if (cnt == 0 && max_chars == 0) - strcpy(buffer, orig_name); - else - sprintf(buffer, "%s%0*d", orig_name, max_chars, cnt); -} - -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; -} - -int -main(int argc, char **argv) -{ - register int cnt, op, i; - bpf_u_int32 localnet, netmask; - register char *cp, *infile, *cmdbuf, *device, *RFileName, *WFileName, *WFileNameAlt; - pcap_handler callback; - int type; - 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 *username = NULL; - char *chroot_dir = NULL; -#ifdef HAVE_PCAP_FINDALLDEVS - pcap_if_t *devpointer; - int devnum; -#endif - int status; -#ifdef WIN32 - u_int UserBufferSize = 1000000; - if(wsockinit() != 0) return 1; -#endif /* WIN32 */ - - 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; - WFileName = NULL; - 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 - - opterr = 0; - while ( - (op = getopt(argc, argv, "aA" B_FLAG "c:C:d" D_FLAG "eE:fF:i:lLm:M:nNOpqr:Rs:StT:u" U_FLAG "vw:W:xXy:YZ:")) != -1) - switch (op) { - - case 'a': - /* compatibility for old -a */ - break; - - case 'A': - ++Aflag; - break; - -#ifdef WIN32 - case 'B': - UserBufferSize = atoi(optarg)*1024; - if (UserBufferSize < 0) - error("invalid packet buffer size %s", optarg); - break; -#endif /* 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 '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. - */ - if ((devnum = atoi(optarg)) != 0) { - if (devnum < 0) - error("Invalid adapter index"); - - if (pcap_findalldevs(&devpointer, ebuf) < 0) - error("%s", ebuf); - else { - for (i = 0; i < devnum-1; i++){ - devpointer = devpointer->next; - if (devpointer == NULL) - error("Invalid adapter index"); - } - } - device = devpointer->name; - break; - } -#endif /* HAVE_PCAP_FINDALLDEVS */ - device = optarg; - break; - - 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 'n': - ++nflag; - break; - - case 'N': - ++Nflag; - 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 - tcpmd5secret = optarg; - 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': { - char *end; - - snaplen = strtol(optarg, &end, 0); - if (optarg == end || *end != '\0' - || snaplen < 0 || snaplen > 65535) - error("invalid snaplen %s", optarg); - else if (snaplen == 0) - snaplen = 65535; - 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 - 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 '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) { - 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 */ - break; - - default: /* Not supported */ - error("only -t, -tt, -ttt, and -tttt are supported"); - break; - } - -#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) { - int dlt; - const char *dlt_name; - -#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 */ - 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; - if (fflag != 0) - error("-f and -r options are incompatible"); - } else { - if (device == NULL) { - device = pcap_lookupdev(ebuf); - if (device == NULL) - error("%s", ebuf); - } -#ifdef WIN32 - 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 */ - *ebuf = '\0'; - pd = pcap_open_live(device, snaplen, !pflag, 1000, ebuf); - if (pd == NULL) - error("%s", ebuf); - else if (*ebuf) - warning("%s", ebuf); - /* - * 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 */ -#ifdef WIN32 - if(UserBufferSize != 1000000) - if(pcap_setbuff(pd, UserBufferSize)==-1){ - error("%s", pcap_geterr(pd)); - } -#endif /* WIN32 */ - if (Lflag) - show_dlts_and_exit(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); - exit(0); - } - init_addrtoname(localnet, netmask); - -#ifndef WIN32 - (void)setsignal(SIGPIPE, cleanup); -#endif /* WIN32 */ - (void)setsignal(SIGTERM, cleanup); - (void)setsignal(SIGINT, cleanup); - /* Cooperate with nohup(1) */ -#ifndef WIN32 - if ((oldhandler = setsignal(SIGHUP, cleanup)) != SIG_DFL) - (void)setsignal(SIGHUP, oldhandler); -#endif /* WIN32 */ - - if (pcap_setfilter(pd, &fcode) < 0) - error("%s", pcap_geterr(pd)); - if (WFileName) { - pcap_dumper_t *p; - - WFileNameAlt = (char *)malloc(strlen(WFileName) + MAX_CFLAG_CHARS + 1); - if (WFileNameAlt == NULL) - error("malloc of WFileNameAlt"); - MakeFilename(WFileNameAlt, WFileName, 0, WflagChars); - p = pcap_dump_open(pd, WFileNameAlt); - if (p == NULL) - error("%s", pcap_geterr(pd)); - if (Cflag != 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; - } - } else { - type = pcap_datalink(pd); - printinfo.printer = lookup_printer(type); - if (printinfo.printer == NULL) { - gndo->ndo_dltname = pcap_datalink_val_to_name(type); - if (gndo->ndo_dltname != NULL) - error("unsupported data link type %s", - gndo->ndo_dltname); - else - error("unsupported data link type %d", type); - } - callback = print_packet; - pcap_userdata = (u_char *)&printinfo; - } -#ifndef WIN32 - /* - * We cannot do this earlier, because we want to be able to open - * the file (if done) for writing before giving up permissions. - */ - if (getuid() == 0 || geteuid() == 0) { - if (username || chroot_dir) - droproot(username, chroot_dir); - } -#endif /* WIN32 */ -#ifdef SIGINFO - (void)setsignal(SIGINFO, 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) { - int dlt; - const char *dlt_name; - - 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 */ - 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); - 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 -} - -static void -info(register int verbose) -{ - struct pcap_stat stat; - - if (pcap_stats(pd, &stat) < 0) { - (void)fprintf(stderr, "pcap_stats: %s\n", pcap_geterr(pd)); - return; - } - - if (!verbose) - fprintf(stderr, "%s: ", program_name); - - (void)fprintf(stderr, "%u packets captured", packets_captured); - if (!verbose) - fputs(", ", stderr); - else - putc('\n', stderr); - (void)fprintf(stderr, "%d packets received by filter", stat.ps_recv); - if (!verbose) - fputs(", ", stderr); - else - putc('\n', stderr); - (void)fprintf(stderr, "%d packets dropped by kernel\n", stat.ps_drop); - infoprint = 0; -} - -static void -dump_packet_and_trunc(u_char *user, const struct pcap_pkthdr *h, const u_char *sp) -{ - struct dump_info *dump_info; - char *name; - - ++packets_captured; - - ++infodelay; - - dump_info = (struct dump_info *)user; - - /* - * 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 (pcap_dump_ftell(dump_info->p) > Cflag) { - /* - * Close the current file and open a new one. - */ - pcap_dump_close(dump_info->p); - Cflag_count++; - if (Wflag > 0) { - if (Cflag_count >= Wflag) - Cflag_count = 0; - } else { - if (Cflag_count >= MAX_CFLAG) - error("too many output files"); - } - name = (char *)malloc(strlen(dump_info->WFileName) + MAX_CFLAG_CHARS + 1); - if (name == NULL) - error("dump_packet_and_trunc: malloc"); - MakeFilename(name, dump_info->WFileName, Cflag_count, WflagChars); - dump_info->p = pcap_dump_open(dump_info->pd, name); - free(name); - 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; - - hdrlen = (*print_info->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 SIGINFO -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) -{ - extern char version[]; -#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 [-aAd" D_FLAG "eflLnNOpqRStu" U_FLAG "vxX]" B_FLAG_USAGE " [-c count] [ -C file_size ]\n", program_name); - (void)fprintf(stderr, -"\t\t[ -E algo:secret ] [ -F file ] [ -i interface ] [ -M secret ]\n"); - (void)fprintf(stderr, -"\t\t[ -r file ] [ -s snaplen ] [ -T type ] [ -w file ]\n"); - (void)fprintf(stderr, -"\t\t[ -W filecount ] [ -y datalinktype ] [ -Z user ]\n"); - (void)fprintf(stderr, -"\t\t[ 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); - } -} - |
