2 * Copyright (c) 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 2000
3 * The Regents of the University of California. All rights reserved.
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that: (1) source code distributions
7 * retain the above copyright notice and this paragraph in its entirety, (2)
8 * distributions including binary code include the above copyright notice and
9 * this paragraph in its entirety in the documentation or other materials
10 * provided with the distribution, and (3) all advertising materials mentioning
11 * features or use of this software display the following acknowledgement:
12 * ``This product includes software developed by the University of California,
13 * Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
14 * the University nor the names of its contributors may be used to endorse
15 * or promote products derived from this software without specific prior
17 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
18 * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
19 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
21 * Support for splitting captures into multiple files with a maximum
25 * Seth Webster <swebster@sst.ll.mit.edu>
29 static const char copyright[] _U_ =
30 "@(#) Copyright (c) 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 2000\n\
31 The Regents of the University of California. All rights reserved.\n";
32 static const char rcsid[] _U_ =
33 "@(#) $Header: /tcpdump/master/tcpdump/tcpdump.c,v 1.283 2008-09-25 21:45:50 guy Exp $ (LBL)";
39 * tcpdump - monitor tcp/ip traffic on an ethernet.
41 * First written in 1987 by Van Jacobson, Lawrence Berkeley Laboratory.
42 * Mercilessly hacked and occasionally improved since then via the
43 * combined efforts of Van, Steve McCanne and Craig Leres of LBL.
50 #include <tcpdump-stdinc.h>
55 extern int strcasecmp (const char *__s1, const char *__s2);
73 #include <sys/resource.h>
80 #include "netdissect.h"
81 #include "interface.h"
82 #include "addrtoname.h"
84 #include "setsignal.h"
85 #include "gmt2local.h"
86 #include "pcap-missing.h"
92 netdissect_options Gndo;
93 netdissect_options *gndo = &Gndo;
95 static int dflag; /* print filter code */
96 static int Lflag; /* list available data link types and exit */
97 static char *zflag = NULL; /* compress each savefile using a specified command (like gzip or bzip2) */
100 static int infoprint;
104 int32_t thiszone; /* seconds offset from gmt to local time */
107 static RETSIGTYPE cleanup(int);
108 static RETSIGTYPE child_cleanup(int);
109 static void usage(void) __attribute__((noreturn));
110 static void show_dlts_and_exit(const char *device, pcap_t *pd) __attribute__((noreturn));
112 static void print_packet(u_char *, const struct pcap_pkthdr *, const u_char *);
113 static void ndo_default_print(netdissect_options *, const u_char *, u_int);
114 static void dump_packet_and_trunc(u_char *, const struct pcap_pkthdr *, const u_char *);
115 static void dump_packet(u_char *, const struct pcap_pkthdr *, const u_char *);
116 static void droproot(const char *, const char *);
117 static void ndo_error(netdissect_options *ndo, const char *fmt, ...);
118 static void ndo_warning(netdissect_options *ndo, const char *fmt, ...);
121 RETSIGTYPE requestinfo(int);
124 #if defined(USE_WIN32_MM_TIMER)
125 #include <MMsystem.h>
126 static UINT timer_id;
127 static void CALLBACK verbose_stats_dump(UINT, UINT, DWORD_PTR, DWORD_PTR, DWORD_PTR);
128 #elif defined(HAVE_ALARM)
129 static void verbose_stats_dump(int sig);
132 static void info(int);
133 static u_int packets_captured;
135 typedef u_int (*if_printer)(const struct pcap_pkthdr *, const u_char *);
136 typedef u_int (*if_ndo_printer)(struct netdissect_options *ndo,
137 const struct pcap_pkthdr *, const u_char *);
151 static struct printer printers[] = {
152 { arcnet_if_print, DLT_ARCNET },
153 #ifdef DLT_ARCNET_LINUX
154 { arcnet_linux_if_print, DLT_ARCNET_LINUX },
156 { ether_if_print, DLT_EN10MB },
157 { token_if_print, DLT_IEEE802 },
159 { lane_if_print, DLT_LANE8023 },
162 { cip_if_print, DLT_CIP },
165 { cip_if_print, DLT_ATM_CLIP },
167 { sl_if_print, DLT_SLIP },
168 #ifdef DLT_SLIP_BSDOS
169 { sl_bsdos_if_print, DLT_SLIP_BSDOS },
171 { ppp_if_print, DLT_PPP },
172 #ifdef DLT_PPP_WITHDIRECTION
173 { ppp_if_print, DLT_PPP_WITHDIRECTION },
176 { ppp_bsdos_if_print, DLT_PPP_BSDOS },
178 { fddi_if_print, DLT_FDDI },
179 { null_if_print, DLT_NULL },
181 { null_if_print, DLT_LOOP },
183 { raw_if_print, DLT_RAW },
184 { atm_if_print, DLT_ATM_RFC1483 },
186 { chdlc_if_print, DLT_C_HDLC },
189 { chdlc_if_print, DLT_HDLC },
191 #ifdef DLT_PPP_SERIAL
192 { ppp_hdlc_if_print, DLT_PPP_SERIAL },
195 { pppoe_if_print, DLT_PPP_ETHER },
198 { sll_if_print, DLT_LINUX_SLL },
200 #ifdef DLT_IEEE802_11
201 { ieee802_11_if_print, DLT_IEEE802_11},
204 { ltalk_if_print, DLT_LTALK },
206 #if defined(DLT_PFLOG) && defined(HAVE_NET_PFVAR_H)
207 { pflog_if_print, DLT_PFLOG },
210 { fr_if_print, DLT_FR },
213 { fr_if_print, DLT_FRELAY },
216 { sunatm_if_print, DLT_SUNATM },
218 #ifdef DLT_IP_OVER_FC
219 { ipfc_if_print, DLT_IP_OVER_FC },
221 #ifdef DLT_PRISM_HEADER
222 { prism_if_print, DLT_PRISM_HEADER },
224 #ifdef DLT_IEEE802_11_RADIO
225 { ieee802_11_radio_if_print, DLT_IEEE802_11_RADIO },
228 { enc_if_print, DLT_ENC },
230 #ifdef DLT_SYMANTEC_FIREWALL
231 { symantec_if_print, DLT_SYMANTEC_FIREWALL },
233 #ifdef DLT_APPLE_IP_OVER_IEEE1394
234 { ap1394_if_print, DLT_APPLE_IP_OVER_IEEE1394 },
236 #ifdef DLT_IEEE802_11_RADIO_AVS
237 { ieee802_11_radio_avs_if_print, DLT_IEEE802_11_RADIO_AVS },
239 #ifdef DLT_JUNIPER_ATM1
240 { juniper_atm1_print, DLT_JUNIPER_ATM1 },
242 #ifdef DLT_JUNIPER_ATM2
243 { juniper_atm2_print, DLT_JUNIPER_ATM2 },
245 #ifdef DLT_JUNIPER_MFR
246 { juniper_mfr_print, DLT_JUNIPER_MFR },
248 #ifdef DLT_JUNIPER_MLFR
249 { juniper_mlfr_print, DLT_JUNIPER_MLFR },
251 #ifdef DLT_JUNIPER_MLPPP
252 { juniper_mlppp_print, DLT_JUNIPER_MLPPP },
254 #ifdef DLT_JUNIPER_PPPOE
255 { juniper_pppoe_print, DLT_JUNIPER_PPPOE },
257 #ifdef DLT_JUNIPER_PPPOE_ATM
258 { juniper_pppoe_atm_print, DLT_JUNIPER_PPPOE_ATM },
260 #ifdef DLT_JUNIPER_GGSN
261 { juniper_ggsn_print, DLT_JUNIPER_GGSN },
263 #ifdef DLT_JUNIPER_ES
264 { juniper_es_print, DLT_JUNIPER_ES },
266 #ifdef DLT_JUNIPER_MONITOR
267 { juniper_monitor_print, DLT_JUNIPER_MONITOR },
269 #ifdef DLT_JUNIPER_SERVICES
270 { juniper_services_print, DLT_JUNIPER_SERVICES },
272 #ifdef DLT_JUNIPER_ETHER
273 { juniper_ether_print, DLT_JUNIPER_ETHER },
275 #ifdef DLT_JUNIPER_PPP
276 { juniper_ppp_print, DLT_JUNIPER_PPP },
278 #ifdef DLT_JUNIPER_FRELAY
279 { juniper_frelay_print, DLT_JUNIPER_FRELAY },
281 #ifdef DLT_JUNIPER_CHDLC
282 { juniper_chdlc_print, DLT_JUNIPER_CHDLC },
285 { mfr_if_print, DLT_MFR },
287 #if defined(DLT_BLUETOOTH_HCI_H4_WITH_PHDR) && defined(HAVE_PCAP_BLUETOOTH_H)
288 { bt_if_print, DLT_BLUETOOTH_HCI_H4_WITH_PHDR},
290 #ifdef HAVE_PCAP_USB_H
292 { usb_linux_48_byte_print, DLT_USB_LINUX},
293 #endif /* DLT_USB_LINUX */
294 #ifdef DLT_USB_LINUX_MMAPPED
295 { usb_linux_64_byte_print, DLT_USB_LINUX_MMAPPED},
296 #endif /* DLT_USB_LINUX_MMAPPED */
297 #endif /* HAVE_PCAP_USB_H */
299 { raw_if_print, DLT_IPV4 },
302 { raw_if_print, DLT_IPV6 },
307 static struct ndo_printer ndo_printers[] = {
309 { ipnet_if_print, DLT_IPNET },
315 lookup_printer(int type)
319 for (p = printers; p->f; ++p)
327 static if_ndo_printer
328 lookup_ndo_printer(int type)
330 struct ndo_printer *p;
332 for (p = ndo_printers; p->f; ++p)
342 static int supports_monitor_mode;
349 netdissect_options *ndo;
352 if_ndo_printer ndo_printer;
359 char *CurrentFileName;
365 show_dlts_and_exit(const char *device, pcap_t *pd)
369 const char *dlt_name;
371 n_dlts = pcap_list_datalinks(pd, &dlts);
373 error("%s", pcap_geterr(pd));
374 else if (n_dlts == 0 || !dlts)
375 error("No data link types.");
378 * If the interface is known to support monitor mode, indicate
379 * whether these are the data link types available when not in
380 * monitor mode, if -I wasn't specified, or when in monitor mode,
381 * when -I was specified (the link-layer types available in
382 * monitor mode might be different from the ones available when
383 * not in monitor mode).
385 if (supports_monitor_mode)
386 (void) fprintf(stderr, "Data link types for %s %s (use option -y to set):\n",
388 Iflag ? "when in monitor mode" : "when not in monitor mode");
390 (void) fprintf(stderr, "Data link types for %s (use option -y to set):\n",
393 while (--n_dlts >= 0) {
394 dlt_name = pcap_datalink_val_to_name(dlts[n_dlts]);
395 if (dlt_name != NULL) {
396 (void) fprintf(stderr, " %s (%s)", dlt_name,
397 pcap_datalink_val_to_description(dlts[n_dlts]));
400 * OK, does tcpdump handle that type?
402 if (lookup_printer(dlts[n_dlts]) == NULL
403 && lookup_ndo_printer(dlts[n_dlts]) == NULL)
404 (void) fprintf(stderr, " (printing not supported)");
407 (void) fprintf(stderr, " DLT %d (printing not supported)\n",
416 * Set up flags that might or might not be supported depending on the
417 * version of libpcap we're using.
419 #if defined(HAVE_PCAP_CREATE) || defined(WIN32)
421 #define B_FLAG_USAGE " [ -B size ]"
422 #else /* defined(HAVE_PCAP_CREATE) || defined(WIN32) */
425 #endif /* defined(HAVE_PCAP_CREATE) || defined(WIN32) */
427 #ifdef HAVE_PCAP_CREATE
429 #else /* HAVE_PCAP_CREATE */
431 #endif /* HAVE_PCAP_CREATE */
433 #ifdef HAVE_PCAP_FINDALLDEVS
434 #ifndef HAVE_PCAP_IF_T
435 #undef HAVE_PCAP_FINDALLDEVS
439 #ifdef HAVE_PCAP_FINDALLDEVS
445 #ifdef HAVE_PCAP_DUMP_FLUSH
452 /* Drop root privileges and chroot if necessary */
454 droproot(const char *username, const char *chroot_dir)
456 struct passwd *pw = NULL;
458 if (chroot_dir && !username) {
459 fprintf(stderr, "tcpdump: Chroot without dropping root is insecure\n");
463 pw = getpwnam(username);
466 if (chroot(chroot_dir) != 0 || chdir ("/") != 0) {
467 fprintf(stderr, "tcpdump: Couldn't chroot/chdir to '%.64s': %s\n",
468 chroot_dir, pcap_strerror(errno));
472 if (initgroups(pw->pw_name, pw->pw_gid) != 0 ||
473 setgid(pw->pw_gid) != 0 || setuid(pw->pw_uid) != 0) {
474 fprintf(stderr, "tcpdump: Couldn't change to '%.32s' uid=%lu gid=%lu: %s\n",
476 (unsigned long)pw->pw_uid,
477 (unsigned long)pw->pw_gid,
478 pcap_strerror(errno));
483 fprintf(stderr, "tcpdump: Couldn't find user '%.32s'\n",
506 MakeFilename(char *buffer, char *orig_name, int cnt, int max_chars)
508 char *filename = malloc(NAME_MAX + 1);
510 /* Process with strftime if Gflag is set. */
514 /* Convert Gflag_time to a usable format */
515 if ((local_tm = localtime(&Gflag_time)) == NULL) {
516 error("MakeTimedFilename: localtime");
519 /* There's no good way to detect an error in strftime since a return
520 * value of 0 isn't necessarily failure.
522 strftime(filename, NAME_MAX, orig_name, local_tm);
524 strncpy(filename, orig_name, NAME_MAX);
527 if (cnt == 0 && max_chars == 0)
528 strncpy(buffer, filename, NAME_MAX + 1);
530 if (snprintf(buffer, NAME_MAX + 1, "%s%0*d", filename, max_chars, cnt) > NAME_MAX)
531 /* Report an error if the filename is too large */
532 error("too many output files or filename is too long (> %d)", NAME_MAX);
536 static int tcpdump_printf(netdissect_options *ndo _U_,
537 const char *fmt, ...)
544 ret=vfprintf(stdout, fmt, args);
551 main(int argc, char **argv)
553 register int cnt, op, i;
554 bpf_u_int32 localnet, netmask;
555 register char *cp, *infile, *cmdbuf, *device, *RFileName, *WFileName;
556 pcap_handler callback;
558 struct bpf_program fcode;
560 RETSIGTYPE (*oldhandler)(int);
562 struct print_info printinfo;
563 struct dump_info dumpinfo;
564 u_char *pcap_userdata;
565 char ebuf[PCAP_ERRBUF_SIZE];
566 char *username = NULL;
567 char *chroot_dir = NULL;
568 #ifdef HAVE_PCAP_FINDALLDEVS
569 pcap_if_t *devpointer;
574 if(wsockinit() != 0) return 1;
580 gndo->ndo_default_print=ndo_default_print;
581 gndo->ndo_printf=tcpdump_printf;
582 gndo->ndo_error=ndo_error;
583 gndo->ndo_warning=ndo_warning;
584 gndo->ndo_snaplen = DEFAULT_SNAPLEN;
591 if ((cp = strrchr(argv[0], '/')) != NULL)
592 program_name = cp + 1;
594 program_name = argv[0];
596 if (abort_on_misalignment(ebuf, sizeof(ebuf)) < 0)
605 (op = getopt(argc, argv, "aAb" B_FLAG "c:C:d" D_FLAG "eE:fF:G:i:" I_FLAG "KlLm:M:nNOpqr:Rs:StT:u" U_FLAG "vw:W:xXy:Yz:Z:")) != -1)
609 /* compatibility for old -a */
620 #if defined(HAVE_PCAP_CREATE) || defined(WIN32)
622 Bflag = atoi(optarg)*1024;
624 error("invalid packet buffer size %s", optarg);
626 #endif /* defined(HAVE_PCAP_CREATE) || defined(WIN32) */
631 error("invalid packet count %s", optarg);
635 Cflag = atoi(optarg) * 1000000;
637 error("invalid file size %s", optarg);
644 #ifdef HAVE_PCAP_FINDALLDEVS
646 if (pcap_findalldevs(&devpointer, ebuf) < 0)
649 for (i = 0; devpointer != 0; i++) {
650 printf("%d.%s", i+1, devpointer->name);
651 if (devpointer->description != NULL)
652 printf(" (%s)", devpointer->description);
654 devpointer = devpointer->next;
658 #endif /* HAVE_PCAP_FINDALLDEVS */
669 #ifndef HAVE_LIBCRYPTO
670 warning("crypto code not compiled in");
672 gndo->ndo_espsecret = optarg;
684 Gflag = atoi(optarg);
686 error("invalid number of seconds %s", optarg);
688 /* We will create one file initially. */
691 /* Grab the current time for rotation use. */
692 if ((Gflag_time = time(NULL)) == (time_t)-1) {
693 error("main: can't get current time: %s",
694 pcap_strerror(errno));
699 if (optarg[0] == '0' && optarg[1] == 0)
700 error("Invalid adapter index");
702 #ifdef HAVE_PCAP_FINDALLDEVS
704 * If the argument is a number, treat it as
705 * an index into the list of adapters, as
706 * printed by "tcpdump -D".
708 * This should be OK on UNIX systems, as interfaces
709 * shouldn't have names that begin with digits.
710 * It can be useful on Windows, where more than
711 * one interface can have the same name.
713 if ((devnum = atoi(optarg)) != 0) {
715 error("Invalid adapter index");
717 if (pcap_findalldevs(&devpointer, ebuf) < 0)
721 * Look for the devnum-th entry
722 * in the list of devices
726 i < devnum-1 && devpointer != NULL;
727 i++, devpointer = devpointer->next)
729 if (devpointer == NULL)
730 error("Invalid adapter index");
732 device = devpointer->name;
735 #endif /* HAVE_PCAP_FINDALLDEVS */
739 #ifdef HAVE_PCAP_CREATE
743 #endif /* HAVE_PCAP_CREATE */
748 * _IOLBF is the same as _IOFBF in Microsoft's C
749 * libraries; the only alternative they offer
752 * XXX - this should really be checking for MSVC++,
753 * not WIN32, if, for example, MinGW has its own
754 * C library that is more UNIX-compatible.
756 setvbuf(stdout, NULL, _IONBF, 0);
758 #ifdef HAVE_SETLINEBUF
761 setvbuf(stdout, NULL, _IOLBF, 0);
772 if (smiLoadModule(optarg) == 0) {
773 error("could not load MIB module %s", optarg);
777 (void)fprintf(stderr, "%s: ignoring option `-m %s' ",
778 program_name, optarg);
779 (void)fprintf(stderr, "(no libsmi support)\n");
784 /* TCP-MD5 shared secret */
785 #ifndef HAVE_LIBCRYPTO
786 warning("crypto code not compiled in");
809 ++suppress_default_print;
823 snaplen = strtol(optarg, &end, 0);
824 if (optarg == end || *end != '\0'
825 || snaplen < 0 || snaplen > MAXIMUM_SNAPLEN)
826 error("invalid snaplen %s", optarg);
827 else if (snaplen == 0)
828 snaplen = MAXIMUM_SNAPLEN;
841 if (strcasecmp(optarg, "vat") == 0)
843 else if (strcasecmp(optarg, "wb") == 0)
845 else if (strcasecmp(optarg, "rpc") == 0)
847 else if (strcasecmp(optarg, "rtp") == 0)
849 else if (strcasecmp(optarg, "rtcp") == 0)
850 packettype = PT_RTCP;
851 else if (strcasecmp(optarg, "snmp") == 0)
852 packettype = PT_SNMP;
853 else if (strcasecmp(optarg, "cnfp") == 0)
854 packettype = PT_CNFP;
855 else if (strcasecmp(optarg, "tftp") == 0)
856 packettype = PT_TFTP;
857 else if (strcasecmp(optarg, "aodv") == 0)
858 packettype = PT_AODV;
860 error("unknown packet type `%s'", optarg);
867 #ifdef HAVE_PCAP_DUMP_FLUSH
882 Wflag = atoi(optarg);
884 error("invalid number of output files %s", optarg);
885 WflagChars = getWflagChars(Wflag);
890 ++suppress_default_print;
895 ++suppress_default_print;
899 gndo->ndo_dltname = optarg;
901 pcap_datalink_name_to_val(gndo->ndo_dltname);
902 if (gndo->ndo_dlt < 0)
903 error("invalid data link type %s", gndo->ndo_dltname);
906 #if defined(HAVE_PCAP_DEBUG) || defined(HAVE_YYDEBUG)
909 /* Undocumented flag */
910 #ifdef HAVE_PCAP_DEBUG
911 extern int pcap_debug;
922 zflag = strdup(optarg);
931 username = strdup(optarg);
946 case 0: /* Default */
947 case 4: /* Default + Date*/
948 thiszone = gmt2local(0);
951 case 1: /* No time stamp */
952 case 2: /* Unix timeval style */
953 case 3: /* Microseconds since previous packet */
954 case 5: /* Microseconds since first packet */
957 default: /* Not supported */
958 error("only -t, -tt, -ttt, -tttt and -ttttt are supported");
963 /* if run as root, prepare for chrooting */
964 if (getuid() == 0 || geteuid() == 0) {
965 /* future extensibility for cmd-line arguments */
967 chroot_dir = WITH_CHROOT;
972 /* if run as root, prepare for dropping root privileges */
973 if (getuid() == 0 || geteuid() == 0) {
974 /* Run with '-Z root' to restore old behaviour */
976 username = WITH_USER;
980 if (RFileName != NULL) {
982 const char *dlt_name;
986 * We don't need network access, so relinquish any set-UID
987 * or set-GID privileges we have (if any).
989 * We do *not* want set-UID privileges when opening a
990 * trace file, as that might let the user read other
991 * people's trace files (especially if we're set-UID
994 if (setgid(getgid()) != 0 || setuid(getuid()) != 0 )
995 fprintf(stderr, "Warning: setgid/setuid failed !\n");
997 pd = pcap_open_offline(RFileName, ebuf);
1000 dlt = pcap_datalink(pd);
1001 dlt_name = pcap_datalink_val_to_name(dlt);
1002 if (dlt_name == NULL) {
1003 fprintf(stderr, "reading from file %s, link-type %u\n",
1007 "reading from file %s, link-type %s (%s)\n",
1008 RFileName, dlt_name,
1009 pcap_datalink_val_to_description(dlt));
1014 error("-f and -r options are incompatible");
1016 if (device == NULL) {
1017 device = pcap_lookupdev(ebuf);
1022 if(strlen(device) == 1) //we assume that an ASCII string is always longer than 1 char
1023 { //a Unicode string has a \0 as second byte (so strlen() is 1)
1024 fprintf(stderr, "%s: listening on %ws\n", program_name, device);
1028 fprintf(stderr, "%s: listening on %s\n", program_name, device);
1033 #ifdef HAVE_PCAP_CREATE
1034 pd = pcap_create(device, ebuf);
1038 * Is this an interface that supports monitor mode?
1040 if (pcap_can_set_rfmon(pd) == 1)
1041 supports_monitor_mode = 1;
1043 supports_monitor_mode = 0;
1044 status = pcap_set_snaplen(pd, snaplen);
1046 error("%s: pcap_set_snaplen failed: %s",
1047 device, pcap_statustostr(status));
1048 status = pcap_set_promisc(pd, !pflag);
1050 error("%s: pcap_set_promisc failed: %s",
1051 device, pcap_statustostr(status));
1053 status = pcap_set_rfmon(pd, 1);
1055 error("%s: pcap_set_rfmon failed: %s",
1056 device, pcap_statustostr(status));
1058 status = pcap_set_timeout(pd, 1000);
1060 error("%s: pcap_set_timeout failed: %s",
1061 device, pcap_statustostr(status));
1063 status = pcap_set_buffer_size(pd, Bflag);
1065 error("%s: pcap_set_buffer_size failed: %s",
1066 device, pcap_statustostr(status));
1068 status = pcap_activate(pd);
1071 * pcap_activate() failed.
1073 cp = pcap_geterr(pd);
1074 if (status == PCAP_ERROR)
1076 else if ((status == PCAP_ERROR_NO_SUCH_DEVICE ||
1077 status == PCAP_ERROR_PERM_DENIED) &&
1079 error("%s: %s\n(%s)", device,
1080 pcap_statustostr(status), cp);
1082 error("%s: %s", device,
1083 pcap_statustostr(status));
1084 } else if (status > 0) {
1086 * pcap_activate() succeeded, but it's warning us
1087 * of a problem it had.
1089 cp = pcap_geterr(pd);
1090 if (status == PCAP_WARNING)
1092 else if (status == PCAP_WARNING_PROMISC_NOTSUP &&
1094 warning("%s: %s\n(%s)", device,
1095 pcap_statustostr(status), cp);
1097 warning("%s: %s", device,
1098 pcap_statustostr(status));
1102 pd = pcap_open_live(device, snaplen, !pflag, 1000, ebuf);
1106 warning("%s", ebuf);
1107 #endif /* HAVE_PCAP_CREATE */
1109 * Let user own process after socket has been opened.
1112 if (setgid(getgid()) != 0 || setuid(getuid()) != 0)
1113 fprintf(stderr, "Warning: setgid/setuid failed !\n");
1115 #if !defined(HAVE_PCAP_CREATE) && defined(WIN32)
1117 if(pcap_setbuff(pd, Bflag)==-1){
1118 error("%s", pcap_geterr(pd));
1120 #endif /* !defined(HAVE_PCAP_CREATE) && defined(WIN32) */
1122 show_dlts_and_exit(device, pd);
1123 if (gndo->ndo_dlt >= 0) {
1124 #ifdef HAVE_PCAP_SET_DATALINK
1125 if (pcap_set_datalink(pd, gndo->ndo_dlt) < 0)
1126 error("%s", pcap_geterr(pd));
1129 * We don't actually support changing the
1130 * data link type, so we only let them
1131 * set it to what it already is.
1133 if (gndo->ndo_dlt != pcap_datalink(pd)) {
1134 error("%s is not one of the DLTs supported by this device\n",
1138 (void)fprintf(stderr, "%s: data link type %s\n",
1139 program_name, gndo->ndo_dltname);
1140 (void)fflush(stderr);
1142 i = pcap_snapshot(pd);
1144 warning("snaplen raised from %d to %d", snaplen, i);
1147 if (pcap_lookupnet(device, &localnet, &netmask, ebuf) < 0) {
1150 warning("%s", ebuf);
1154 cmdbuf = read_infile(infile);
1156 cmdbuf = copy_argv(&argv[optind]);
1158 if (pcap_compile(pd, &fcode, cmdbuf, Oflag, netmask) < 0)
1159 error("%s", pcap_geterr(pd));
1162 bpf_dump(&fcode, dflag);
1166 init_addrtoname(localnet, netmask);
1170 (void)setsignal(SIGPIPE, cleanup);
1171 (void)setsignal(SIGTERM, cleanup);
1172 (void)setsignal(SIGINT, cleanup);
1173 (void)setsignal(SIGCHLD, child_cleanup);
1175 /* Cooperate with nohup(1) */
1177 if ((oldhandler = setsignal(SIGHUP, cleanup)) != SIG_DFL)
1178 (void)setsignal(SIGHUP, oldhandler);
1181 if (pcap_setfilter(pd, &fcode) < 0)
1182 error("%s", pcap_geterr(pd));
1185 /* Do not exceed the default NAME_MAX for files. */
1186 dumpinfo.CurrentFileName = (char *)malloc(NAME_MAX + 1);
1188 if (dumpinfo.CurrentFileName == NULL)
1189 error("malloc of dumpinfo.CurrentFileName");
1191 /* We do not need numbering for dumpfiles if Cflag isn't set. */
1193 MakeFilename(dumpinfo.CurrentFileName, WFileName, 0, WflagChars);
1195 MakeFilename(dumpinfo.CurrentFileName, WFileName, 0, 0);
1197 p = pcap_dump_open(pd, dumpinfo.CurrentFileName);
1199 error("%s", pcap_geterr(pd));
1200 if (Cflag != 0 || Gflag != 0) {
1201 callback = dump_packet_and_trunc;
1202 dumpinfo.WFileName = WFileName;
1205 pcap_userdata = (u_char *)&dumpinfo;
1207 callback = dump_packet;
1208 pcap_userdata = (u_char *)p;
1211 type = pcap_datalink(pd);
1212 printinfo.ndo_type = 1;
1213 printinfo.ndo = gndo;
1214 printinfo.p.ndo_printer = lookup_ndo_printer(type);
1215 if (printinfo.p.ndo_printer == NULL) {
1216 printinfo.p.printer = lookup_printer(type);
1217 printinfo.ndo_type = 0;
1218 if (printinfo.p.printer == NULL) {
1219 gndo->ndo_dltname = pcap_datalink_val_to_name(type);
1220 if (gndo->ndo_dltname != NULL)
1221 error("packet printing is not supported for link type %s: use -w",
1224 error("packet printing is not supported for link type %d: use -w", type);
1227 callback = print_packet;
1228 pcap_userdata = (u_char *)&printinfo;
1232 * We cannot do this earlier, because we want to be able to open
1233 * the file (if done) for writing before giving up permissions.
1235 if (getuid() == 0 || geteuid() == 0) {
1236 if (username || chroot_dir)
1237 droproot(username, chroot_dir);
1242 * We can't get statistics when reading from a file rather
1243 * than capturing from a device.
1245 if (RFileName == NULL)
1246 (void)setsignal(SIGINFO, requestinfo);
1249 if (vflag > 0 && WFileName) {
1251 * When capturing to a file, "-v" means tcpdump should,
1252 * every 10 secodns, "v"erbosely report the number of
1255 #ifdef USE_WIN32_MM_TIMER
1256 /* call verbose_stats_dump() each 1000 +/-100msec */
1257 timer_id = timeSetEvent(1000, 100, verbose_stats_dump, 0, TIME_PERIODIC);
1258 setvbuf(stderr, NULL, _IONBF, 0);
1259 #elif defined(HAVE_ALARM)
1260 (void)setsignal(SIGALRM, verbose_stats_dump);
1266 if (RFileName == NULL) {
1268 const char *dlt_name;
1270 if (!vflag && !WFileName) {
1271 (void)fprintf(stderr,
1272 "%s: verbose output suppressed, use -v or -vv for full protocol decode\n",
1275 (void)fprintf(stderr, "%s: ", program_name);
1276 dlt = pcap_datalink(pd);
1277 dlt_name = pcap_datalink_val_to_name(dlt);
1278 if (dlt_name == NULL) {
1279 (void)fprintf(stderr, "listening on %s, link-type %u, capture size %u bytes\n",
1280 device, dlt, snaplen);
1282 (void)fprintf(stderr, "listening on %s, link-type %s (%s), capture size %u bytes\n",
1284 pcap_datalink_val_to_description(dlt), snaplen);
1286 (void)fflush(stderr);
1289 status = pcap_loop(pd, cnt, callback, pcap_userdata);
1290 if (WFileName == NULL) {
1292 * We're printing packets. Flush the printed output,
1293 * so it doesn't get intermingled with error output.
1297 * We got interrupted, so perhaps we didn't
1298 * manage to finish a line we were printing.
1299 * Print an extra newline, just in case.
1303 (void)fflush(stdout);
1309 (void)fprintf(stderr, "%s: pcap_loop: %s\n",
1310 program_name, pcap_geterr(pd));
1312 if (RFileName == NULL) {
1314 * We're doing a live capture. Report the capture
1320 exit(status == -1 ? 1 : 0);
1323 /* make a clean exit on interrupts */
1325 cleanup(int signo _U_)
1327 #ifdef USE_WIN32_MM_TIMER
1329 timeKillEvent(timer_id);
1331 #elif defined(HAVE_ALARM)
1335 #ifdef HAVE_PCAP_BREAKLOOP
1337 * We have "pcap_breakloop()"; use it, so that we do as little
1338 * as possible in the signal handler (it's probably not safe
1339 * to do anything with standard I/O streams in a signal handler -
1340 * the ANSI C standard doesn't say it is).
1345 * We don't have "pcap_breakloop()"; this isn't safe, but
1346 * it's the best we can do. Print the summary if we're
1347 * not reading from a savefile - i.e., if we're doing a
1348 * live capture - and exit.
1350 if (pd != NULL && pcap_file(pd) == NULL) {
1352 * We got interrupted, so perhaps we didn't
1353 * manage to finish a line we were printing.
1354 * Print an extra newline, just in case.
1357 (void)fflush(stdout);
1365 On windows, we do not use a fork, so we do not care less about
1366 waiting a child processes to die
1370 child_cleanup(int signo _U_)
1377 info(register int verbose)
1379 struct pcap_stat stat;
1382 * Older versions of libpcap didn't set ps_ifdrop on some
1383 * platforms; initialize it to 0 to handle that.
1386 if (pcap_stats(pd, &stat) < 0) {
1387 (void)fprintf(stderr, "pcap_stats: %s\n", pcap_geterr(pd));
1393 fprintf(stderr, "%s: ", program_name);
1395 (void)fprintf(stderr, "%u packets captured", packets_captured);
1397 fputs(", ", stderr);
1400 (void)fprintf(stderr, "%u packets received by filter", stat.ps_recv);
1402 fputs(", ", stderr);
1405 (void)fprintf(stderr, "%u packets dropped by kernel", stat.ps_drop);
1406 if (stat.ps_ifdrop != 0) {
1408 fputs(", ", stderr);
1411 (void)fprintf(stderr, "%u packets dropped by interface\n",
1420 compress_savefile(const char *filename)
1425 * Set to lowest priority so that this doesn't disturb the capture
1428 setpriority(PRIO_PROCESS, 0, NZERO - 1);
1430 setpriority(PRIO_PROCESS, 0, 19);
1432 if (execlp(zflag, zflag, filename, (char *)NULL) == -1)
1434 "compress_savefile:execlp(%s, %s): %s\n",
1441 compress_savefile(const char *filename)
1444 "compress_savefile failed. Functionality not implemented under windows\n");
1449 dump_packet_and_trunc(u_char *user, const struct pcap_pkthdr *h, const u_char *sp)
1451 struct dump_info *dump_info;
1457 dump_info = (struct dump_info *)user;
1460 * XXX - this won't force the file to rotate on the specified time
1461 * boundary, but it will rotate on the first packet received after the
1462 * specified Gflag number of seconds. Note: if a Gflag time boundary
1463 * and a Cflag size boundary coincide, the time rotation will occur
1464 * first thereby cancelling the Cflag boundary (since the file should
1468 /* Check if it is time to rotate */
1471 /* Get the current time */
1472 if ((t = time(NULL)) == (time_t)-1) {
1473 error("dump_and_trunc_packet: can't get current_time: %s",
1474 pcap_strerror(errno));
1478 /* If the time is greater than the specified window, rotate */
1479 if (t - Gflag_time >= Gflag) {
1480 /* Update the Gflag_time */
1482 /* Update Gflag_count */
1485 * Close the current file and open a new one.
1487 pcap_dump_close(dump_info->p);
1490 * Compress the file we just closed, if the user asked for it
1493 compress_savefile(dump_info->CurrentFileName);
1496 * Check to see if we've exceeded the Wflag (when
1499 if (Cflag == 0 && Wflag > 0 && Gflag_count >= Wflag) {
1500 (void)fprintf(stderr, "Maximum file limit reached: %d\n",
1505 if (dump_info->CurrentFileName != NULL)
1506 free(dump_info->CurrentFileName);
1507 /* Allocate space for max filename + \0. */
1508 dump_info->CurrentFileName = (char *)malloc(NAME_MAX + 1);
1509 if (dump_info->CurrentFileName == NULL)
1510 error("dump_packet_and_trunc: malloc");
1512 * This is always the first file in the Cflag
1514 * We also don't need numbering if Cflag is not set.
1517 MakeFilename(dump_info->CurrentFileName, dump_info->WFileName, 0,
1520 MakeFilename(dump_info->CurrentFileName, dump_info->WFileName, 0, 0);
1522 dump_info->p = pcap_dump_open(dump_info->pd, dump_info->CurrentFileName);
1523 if (dump_info->p == NULL)
1524 error("%s", pcap_geterr(pd));
1529 * XXX - this won't prevent capture files from getting
1530 * larger than Cflag - the last packet written to the
1531 * file could put it over Cflag.
1533 if (Cflag != 0 && pcap_dump_ftell(dump_info->p) > Cflag) {
1535 * Close the current file and open a new one.
1537 pcap_dump_close(dump_info->p);
1540 * Compress the file we just closed, if the user asked for it
1543 compress_savefile(dump_info->CurrentFileName);
1547 if (Cflag_count >= Wflag)
1550 if (dump_info->CurrentFileName != NULL)
1551 free(dump_info->CurrentFileName);
1552 dump_info->CurrentFileName = (char *)malloc(NAME_MAX + 1);
1553 if (dump_info->CurrentFileName == NULL)
1554 error("dump_packet_and_trunc: malloc");
1555 MakeFilename(dump_info->CurrentFileName, dump_info->WFileName, Cflag_count, WflagChars);
1556 dump_info->p = pcap_dump_open(dump_info->pd, dump_info->CurrentFileName);
1557 if (dump_info->p == NULL)
1558 error("%s", pcap_geterr(pd));
1561 pcap_dump((u_char *)dump_info->p, h, sp);
1562 #ifdef HAVE_PCAP_DUMP_FLUSH
1564 pcap_dump_flush(dump_info->p);
1573 dump_packet(u_char *user, const struct pcap_pkthdr *h, const u_char *sp)
1579 pcap_dump(user, h, sp);
1580 #ifdef HAVE_PCAP_DUMP_FLUSH
1582 pcap_dump_flush((pcap_dumper_t *)user);
1591 print_packet(u_char *user, const struct pcap_pkthdr *h, const u_char *sp)
1593 struct print_info *print_info;
1601 print_info = (struct print_info *)user;
1604 * Some printers want to check that they're not walking off the
1605 * end of the packet.
1606 * Rather than pass it all the way down, we set this global.
1608 snapend = sp + h->caplen;
1610 if(print_info->ndo_type) {
1611 hdrlen = (*print_info->p.ndo_printer)(print_info->ndo, h, sp);
1613 hdrlen = (*print_info->p.printer)(h, sp);
1618 * Print the raw packet data in hex and ASCII.
1622 * Include the link-layer header.
1624 hex_and_ascii_print("\n\t", sp, h->caplen);
1627 * Don't include the link-layer header - and if
1628 * we have nothing past the link-layer header,
1631 if (h->caplen > hdrlen)
1632 hex_and_ascii_print("\n\t", sp + hdrlen,
1633 h->caplen - hdrlen);
1637 * Print the raw packet data in hex.
1641 * Include the link-layer header.
1643 hex_print("\n\t", sp, h->caplen);
1646 * Don't include the link-layer header - and if
1647 * we have nothing past the link-layer header,
1650 if (h->caplen > hdrlen)
1651 hex_print("\n\t", sp + hdrlen,
1652 h->caplen - hdrlen);
1656 * Print the raw packet data in ASCII.
1660 * Include the link-layer header.
1662 ascii_print(sp, h->caplen);
1665 * Don't include the link-layer header - and if
1666 * we have nothing past the link-layer header,
1669 if (h->caplen > hdrlen)
1670 ascii_print(sp + hdrlen, h->caplen - hdrlen);
1683 * XXX - there should really be libpcap calls to get the version
1684 * number as a string (the string would be generated from #defines
1685 * at run time, so that it's not generated from string constants
1686 * in the library, as, on many UNIX systems, those constants would
1687 * be statically linked into the application executable image, and
1688 * would thus reflect the version of libpcap on the system on
1689 * which the application was *linked*, not the system on which it's
1692 * That routine should be documented, unlike the "version[]"
1693 * string, so that UNIX vendors providing their own libpcaps
1694 * don't omit it (as a couple of vendors have...).
1696 * Packet.dll should perhaps also export a routine to return the
1697 * version number of the Packet.dll code, to supply the
1698 * "Wpcap_version" information on Windows.
1700 char WDversion[]="current-cvs.tcpdump.org";
1701 #if !defined(HAVE_GENERATED_VERSION)
1702 char version[]="current-cvs.tcpdump.org";
1704 char pcap_version[]="current-cvs.tcpdump.org";
1705 char Wpcap_version[]="3.1";
1709 * By default, print the specified data out in hex and ASCII.
1712 ndo_default_print(netdissect_options *ndo _U_, const u_char *bp, u_int length)
1714 hex_and_ascii_print("\n\t", bp, length); /* pass on lf and identation string */
1718 default_print(const u_char *bp, u_int length)
1720 ndo_default_print(gndo, bp, length);
1724 RETSIGTYPE requestinfo(int signo _U_)
1734 * Called once each second in verbose mode while dumping to file
1736 #ifdef USE_WIN32_MM_TIMER
1737 void CALLBACK verbose_stats_dump (UINT timer_id _U_, UINT msg _U_, DWORD_PTR arg _U_,
1738 DWORD_PTR dw1 _U_, DWORD_PTR dw2 _U_)
1740 struct pcap_stat stat;
1742 if (infodelay == 0 && pcap_stats(pd, &stat) >= 0)
1743 fprintf(stderr, "Got %u\r", packets_captured);
1745 #elif defined(HAVE_ALARM)
1746 static void verbose_stats_dump(int sig _U_)
1748 struct pcap_stat stat;
1750 if (infodelay == 0 && pcap_stats(pd, &stat) >= 0)
1751 fprintf(stderr, "Got %u\r", packets_captured);
1759 extern char version[];
1760 #ifndef HAVE_PCAP_LIB_VERSION
1761 #if defined(WIN32) || defined(HAVE_PCAP_VERSION)
1762 extern char pcap_version[];
1763 #else /* defined(WIN32) || defined(HAVE_PCAP_VERSION) */
1764 static char pcap_version[] = "unknown";
1765 #endif /* defined(WIN32) || defined(HAVE_PCAP_VERSION) */
1766 #endif /* HAVE_PCAP_LIB_VERSION */
1768 #ifdef HAVE_PCAP_LIB_VERSION
1770 (void)fprintf(stderr, "%s version %s, based on tcpdump version %s\n", program_name, WDversion, version);
1772 (void)fprintf(stderr, "%s version %s\n", program_name, version);
1774 (void)fprintf(stderr, "%s\n",pcap_lib_version());
1775 #else /* HAVE_PCAP_LIB_VERSION */
1777 (void)fprintf(stderr, "%s version %s, based on tcpdump version %s\n", program_name, WDversion, version);
1778 (void)fprintf(stderr, "WinPcap version %s, based on libpcap version %s\n",Wpcap_version, pcap_version);
1780 (void)fprintf(stderr, "%s version %s\n", program_name, version);
1781 (void)fprintf(stderr, "libpcap version %s\n", pcap_version);
1783 #endif /* HAVE_PCAP_LIB_VERSION */
1784 (void)fprintf(stderr,
1785 "Usage: %s [-aAbd" D_FLAG "ef" I_FLAG "KlLnNOpqRStu" U_FLAG "vxX]" B_FLAG_USAGE " [ -c count ]\n", program_name);
1786 (void)fprintf(stderr,
1787 "\t\t[ -C file_size ] [ -E algo:secret ] [ -F file ] [ -G seconds ]\n");
1788 (void)fprintf(stderr,
1789 "\t\t[ -i interface ] [ -M secret ] [ -r file ]\n");
1790 (void)fprintf(stderr,
1791 "\t\t[ -s snaplen ] [ -T type ] [ -w file ] [ -W filecount ]\n");
1792 (void)fprintf(stderr,
1793 "\t\t[ -y datalinktype ] [ -z command ] [ -Z user ]\n");
1794 (void)fprintf(stderr,
1795 "\t\t[ expression ]\n");
1803 ndo_error(netdissect_options *ndo _U_, const char *fmt, ...)
1807 (void)fprintf(stderr, "%s: ", program_name);
1809 (void)vfprintf(stderr, fmt, ap);
1813 if (fmt[-1] != '\n')
1814 (void)fputc('\n', stderr);
1822 ndo_warning(netdissect_options *ndo _U_, const char *fmt, ...)
1826 (void)fprintf(stderr, "%s: WARNING: ", program_name);
1828 (void)vfprintf(stderr, fmt, ap);
1832 if (fmt[-1] != '\n')
1833 (void)fputc('\n', stderr);