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)";
37 * tcpdump - monitor tcp/ip traffic on an ethernet.
39 * First written in 1987 by Van Jacobson, Lawrence Berkeley Laboratory.
40 * Mercilessly hacked and occasionally improved since then via the
41 * combined efforts of Van, Steve McCanne and Craig Leres of LBL.
48 #include <tcpdump-stdinc.h>
53 extern int strcasecmp (const char *__s1, const char *__s2);
71 #include <sys/resource.h>
78 #include "netdissect.h"
79 #include "interface.h"
80 #include "addrtoname.h"
82 #include "setsignal.h"
83 #include "gmt2local.h"
84 #include "pcap-missing.h"
90 netdissect_options Gndo;
91 netdissect_options *gndo = &Gndo;
93 static int dflag; /* print filter code */
94 static int Lflag; /* list available data link types and exit */
95 static char *zflag = NULL; /* compress each savefile using a specified command (like gzip or bzip2) */
102 int32_t thiszone; /* seconds offset from gmt to local time */
105 static RETSIGTYPE cleanup(int);
106 static RETSIGTYPE child_cleanup(int);
107 static void usage(void) __attribute__((noreturn));
108 static void show_dlts_and_exit(const char *device, pcap_t *pd) __attribute__((noreturn));
110 static void print_packet(u_char *, const struct pcap_pkthdr *, const u_char *);
111 static void ndo_default_print(netdissect_options *, const u_char *, u_int);
112 static void dump_packet_and_trunc(u_char *, const struct pcap_pkthdr *, const u_char *);
113 static void dump_packet(u_char *, const struct pcap_pkthdr *, const u_char *);
114 static void droproot(const char *, const char *);
115 static void ndo_error(netdissect_options *ndo, const char *fmt, ...);
116 static void ndo_warning(netdissect_options *ndo, const char *fmt, ...);
119 RETSIGTYPE requestinfo(int);
122 #if defined(USE_WIN32_MM_TIMER)
123 #include <MMsystem.h>
124 static UINT timer_id;
125 static void CALLBACK verbose_stats_dump(UINT, UINT, DWORD_PTR, DWORD_PTR, DWORD_PTR);
126 #elif defined(HAVE_ALARM)
127 static void verbose_stats_dump(int sig);
130 static void info(int);
131 static u_int packets_captured;
133 typedef u_int (*if_printer)(const struct pcap_pkthdr *, const u_char *);
134 typedef u_int (*if_ndo_printer)(struct netdissect_options *ndo,
135 const struct pcap_pkthdr *, const u_char *);
149 static struct printer printers[] = {
150 { arcnet_if_print, DLT_ARCNET },
151 #ifdef DLT_ARCNET_LINUX
152 { arcnet_linux_if_print, DLT_ARCNET_LINUX },
154 { ether_if_print, DLT_EN10MB },
155 { token_if_print, DLT_IEEE802 },
157 { lane_if_print, DLT_LANE8023 },
160 { cip_if_print, DLT_CIP },
163 { cip_if_print, DLT_ATM_CLIP },
165 { sl_if_print, DLT_SLIP },
166 #ifdef DLT_SLIP_BSDOS
167 { sl_bsdos_if_print, DLT_SLIP_BSDOS },
169 { ppp_if_print, DLT_PPP },
170 #ifdef DLT_PPP_WITHDIRECTION
171 { ppp_if_print, DLT_PPP_WITHDIRECTION },
174 { ppp_bsdos_if_print, DLT_PPP_BSDOS },
176 { fddi_if_print, DLT_FDDI },
177 { null_if_print, DLT_NULL },
179 { null_if_print, DLT_LOOP },
181 { raw_if_print, DLT_RAW },
182 { atm_if_print, DLT_ATM_RFC1483 },
184 { chdlc_if_print, DLT_C_HDLC },
187 { chdlc_if_print, DLT_HDLC },
189 #ifdef DLT_PPP_SERIAL
190 { ppp_hdlc_if_print, DLT_PPP_SERIAL },
193 { pppoe_if_print, DLT_PPP_ETHER },
196 { sll_if_print, DLT_LINUX_SLL },
198 #ifdef DLT_IEEE802_11
199 { ieee802_11_if_print, DLT_IEEE802_11},
202 { ltalk_if_print, DLT_LTALK },
204 #if defined(DLT_PFLOG) && defined(HAVE_NET_PFVAR_H)
205 { pflog_if_print, DLT_PFLOG },
208 { fr_if_print, DLT_FR },
211 { fr_if_print, DLT_FRELAY },
214 { sunatm_if_print, DLT_SUNATM },
216 #ifdef DLT_IP_OVER_FC
217 { ipfc_if_print, DLT_IP_OVER_FC },
219 #ifdef DLT_PRISM_HEADER
220 { prism_if_print, DLT_PRISM_HEADER },
222 #ifdef DLT_IEEE802_11_RADIO
223 { ieee802_11_radio_if_print, DLT_IEEE802_11_RADIO },
226 { enc_if_print, DLT_ENC },
228 #ifdef DLT_SYMANTEC_FIREWALL
229 { symantec_if_print, DLT_SYMANTEC_FIREWALL },
231 #ifdef DLT_APPLE_IP_OVER_IEEE1394
232 { ap1394_if_print, DLT_APPLE_IP_OVER_IEEE1394 },
234 #ifdef DLT_IEEE802_11_RADIO_AVS
235 { ieee802_11_radio_avs_if_print, DLT_IEEE802_11_RADIO_AVS },
237 #ifdef DLT_JUNIPER_ATM1
238 { juniper_atm1_print, DLT_JUNIPER_ATM1 },
240 #ifdef DLT_JUNIPER_ATM2
241 { juniper_atm2_print, DLT_JUNIPER_ATM2 },
243 #ifdef DLT_JUNIPER_MFR
244 { juniper_mfr_print, DLT_JUNIPER_MFR },
246 #ifdef DLT_JUNIPER_MLFR
247 { juniper_mlfr_print, DLT_JUNIPER_MLFR },
249 #ifdef DLT_JUNIPER_MLPPP
250 { juniper_mlppp_print, DLT_JUNIPER_MLPPP },
252 #ifdef DLT_JUNIPER_PPPOE
253 { juniper_pppoe_print, DLT_JUNIPER_PPPOE },
255 #ifdef DLT_JUNIPER_PPPOE_ATM
256 { juniper_pppoe_atm_print, DLT_JUNIPER_PPPOE_ATM },
258 #ifdef DLT_JUNIPER_GGSN
259 { juniper_ggsn_print, DLT_JUNIPER_GGSN },
261 #ifdef DLT_JUNIPER_ES
262 { juniper_es_print, DLT_JUNIPER_ES },
264 #ifdef DLT_JUNIPER_MONITOR
265 { juniper_monitor_print, DLT_JUNIPER_MONITOR },
267 #ifdef DLT_JUNIPER_SERVICES
268 { juniper_services_print, DLT_JUNIPER_SERVICES },
270 #ifdef DLT_JUNIPER_ETHER
271 { juniper_ether_print, DLT_JUNIPER_ETHER },
273 #ifdef DLT_JUNIPER_PPP
274 { juniper_ppp_print, DLT_JUNIPER_PPP },
276 #ifdef DLT_JUNIPER_FRELAY
277 { juniper_frelay_print, DLT_JUNIPER_FRELAY },
279 #ifdef DLT_JUNIPER_CHDLC
280 { juniper_chdlc_print, DLT_JUNIPER_CHDLC },
283 { mfr_if_print, DLT_MFR },
285 #if defined(DLT_BLUETOOTH_HCI_H4_WITH_PHDR) && defined(HAVE_PCAP_BLUETOOTH_H)
286 { bt_if_print, DLT_BLUETOOTH_HCI_H4_WITH_PHDR},
288 #ifdef HAVE_PCAP_USB_H
290 { usb_linux_48_byte_print, DLT_USB_LINUX},
291 #endif /* DLT_USB_LINUX */
292 #ifdef DLT_USB_LINUX_MMAPPED
293 { usb_linux_64_byte_print, DLT_USB_LINUX_MMAPPED},
294 #endif /* DLT_USB_LINUX_MMAPPED */
295 #endif /* HAVE_PCAP_USB_H */
297 { raw_if_print, DLT_IPV4 },
300 { raw_if_print, DLT_IPV6 },
305 static struct ndo_printer ndo_printers[] = {
307 { ipnet_if_print, DLT_IPNET },
313 lookup_printer(int type)
317 for (p = printers; p->f; ++p)
325 static if_ndo_printer
326 lookup_ndo_printer(int type)
328 struct ndo_printer *p;
330 for (p = ndo_printers; p->f; ++p)
340 static int supports_monitor_mode;
347 netdissect_options *ndo;
350 if_ndo_printer ndo_printer;
357 char *CurrentFileName;
363 show_dlts_and_exit(const char *device, pcap_t *pd)
367 const char *dlt_name;
369 n_dlts = pcap_list_datalinks(pd, &dlts);
371 error("%s", pcap_geterr(pd));
372 else if (n_dlts == 0 || !dlts)
373 error("No data link types.");
376 * If the interface is known to support monitor mode, indicate
377 * whether these are the data link types available when not in
378 * monitor mode, if -I wasn't specified, or when in monitor mode,
379 * when -I was specified (the link-layer types available in
380 * monitor mode might be different from the ones available when
381 * not in monitor mode).
383 if (supports_monitor_mode)
384 (void) fprintf(stderr, "Data link types for %s %s (use option -y to set):\n",
386 Iflag ? "when in monitor mode" : "when not in monitor mode");
388 (void) fprintf(stderr, "Data link types for %s (use option -y to set):\n",
391 while (--n_dlts >= 0) {
392 dlt_name = pcap_datalink_val_to_name(dlts[n_dlts]);
393 if (dlt_name != NULL) {
394 (void) fprintf(stderr, " %s (%s)", dlt_name,
395 pcap_datalink_val_to_description(dlts[n_dlts]));
398 * OK, does tcpdump handle that type?
400 if (lookup_printer(dlts[n_dlts]) == NULL
401 && lookup_ndo_printer(dlts[n_dlts]) == NULL)
402 (void) fprintf(stderr, " (printing not supported)");
405 (void) fprintf(stderr, " DLT %d (printing not supported)\n",
414 * Set up flags that might or might not be supported depending on the
415 * version of libpcap we're using.
417 #if defined(HAVE_PCAP_CREATE) || defined(WIN32)
419 #define B_FLAG_USAGE " [ -B size ]"
420 #else /* defined(HAVE_PCAP_CREATE) || defined(WIN32) */
423 #endif /* defined(HAVE_PCAP_CREATE) || defined(WIN32) */
425 #ifdef HAVE_PCAP_CREATE
427 #else /* HAVE_PCAP_CREATE */
429 #endif /* HAVE_PCAP_CREATE */
431 #ifdef HAVE_PCAP_FINDALLDEVS
432 #ifndef HAVE_PCAP_IF_T
433 #undef HAVE_PCAP_FINDALLDEVS
437 #ifdef HAVE_PCAP_FINDALLDEVS
443 #ifdef HAVE_PCAP_DUMP_FLUSH
450 /* Drop root privileges and chroot if necessary */
452 droproot(const char *username, const char *chroot_dir)
454 struct passwd *pw = NULL;
456 if (chroot_dir && !username) {
457 fprintf(stderr, "tcpdump: Chroot without dropping root is insecure\n");
461 pw = getpwnam(username);
464 if (chroot(chroot_dir) != 0 || chdir ("/") != 0) {
465 fprintf(stderr, "tcpdump: Couldn't chroot/chdir to '%.64s': %s\n",
466 chroot_dir, pcap_strerror(errno));
470 if (initgroups(pw->pw_name, pw->pw_gid) != 0 ||
471 setgid(pw->pw_gid) != 0 || setuid(pw->pw_uid) != 0) {
472 fprintf(stderr, "tcpdump: Couldn't change to '%.32s' uid=%lu gid=%lu: %s\n",
474 (unsigned long)pw->pw_uid,
475 (unsigned long)pw->pw_gid,
476 pcap_strerror(errno));
481 fprintf(stderr, "tcpdump: Couldn't find user '%.32s'\n",
504 MakeFilename(char *buffer, char *orig_name, int cnt, int max_chars)
506 char *filename = malloc(NAME_MAX + 1);
508 /* Process with strftime if Gflag is set. */
512 /* Convert Gflag_time to a usable format */
513 if ((local_tm = localtime(&Gflag_time)) == NULL) {
514 error("MakeTimedFilename: localtime");
517 /* There's no good way to detect an error in strftime since a return
518 * value of 0 isn't necessarily failure.
520 strftime(filename, NAME_MAX, orig_name, local_tm);
522 strncpy(filename, orig_name, NAME_MAX);
525 if (cnt == 0 && max_chars == 0)
526 strncpy(buffer, filename, NAME_MAX + 1);
528 if (snprintf(buffer, NAME_MAX + 1, "%s%0*d", filename, max_chars, cnt) > NAME_MAX)
529 /* Report an error if the filename is too large */
530 error("too many output files or filename is too long (> %d)", NAME_MAX);
534 static int tcpdump_printf(netdissect_options *ndo _U_,
535 const char *fmt, ...)
542 ret=vfprintf(stdout, fmt, args);
549 main(int argc, char **argv)
551 register int cnt, op, i;
552 bpf_u_int32 localnet, netmask;
553 register char *cp, *infile, *cmdbuf, *device, *RFileName, *WFileName;
554 pcap_handler callback;
556 struct bpf_program fcode;
558 RETSIGTYPE (*oldhandler)(int);
560 struct print_info printinfo;
561 struct dump_info dumpinfo;
562 u_char *pcap_userdata;
563 char ebuf[PCAP_ERRBUF_SIZE];
564 char *username = NULL;
565 char *chroot_dir = NULL;
566 #ifdef HAVE_PCAP_FINDALLDEVS
567 pcap_if_t *devpointer;
572 if(wsockinit() != 0) return 1;
578 gndo->ndo_default_print=ndo_default_print;
579 gndo->ndo_printf=tcpdump_printf;
580 gndo->ndo_error=ndo_error;
581 gndo->ndo_warning=ndo_warning;
582 gndo->ndo_snaplen = DEFAULT_SNAPLEN;
589 if ((cp = strrchr(argv[0], '/')) != NULL)
590 program_name = cp + 1;
592 program_name = argv[0];
594 if (abort_on_misalignment(ebuf, sizeof(ebuf)) < 0)
603 (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)
607 /* compatibility for old -a */
618 #if defined(HAVE_PCAP_CREATE) || defined(WIN32)
620 Bflag = atoi(optarg)*1024;
622 error("invalid packet buffer size %s", optarg);
624 #endif /* defined(HAVE_PCAP_CREATE) || defined(WIN32) */
629 error("invalid packet count %s", optarg);
633 Cflag = atoi(optarg) * 1000000;
635 error("invalid file size %s", optarg);
642 #ifdef HAVE_PCAP_FINDALLDEVS
644 if (pcap_findalldevs(&devpointer, ebuf) < 0)
647 for (i = 0; devpointer != 0; i++) {
648 printf("%d.%s", i+1, devpointer->name);
649 if (devpointer->description != NULL)
650 printf(" (%s)", devpointer->description);
652 devpointer = devpointer->next;
656 #endif /* HAVE_PCAP_FINDALLDEVS */
667 #ifndef HAVE_LIBCRYPTO
668 warning("crypto code not compiled in");
670 gndo->ndo_espsecret = optarg;
682 Gflag = atoi(optarg);
684 error("invalid number of seconds %s", optarg);
686 /* We will create one file initially. */
689 /* Grab the current time for rotation use. */
690 if ((Gflag_time = time(NULL)) == (time_t)-1) {
691 error("main: can't get current time: %s",
692 pcap_strerror(errno));
697 if (optarg[0] == '0' && optarg[1] == 0)
698 error("Invalid adapter index");
700 #ifdef HAVE_PCAP_FINDALLDEVS
702 * If the argument is a number, treat it as
703 * an index into the list of adapters, as
704 * printed by "tcpdump -D".
706 * This should be OK on UNIX systems, as interfaces
707 * shouldn't have names that begin with digits.
708 * It can be useful on Windows, where more than
709 * one interface can have the same name.
711 if ((devnum = atoi(optarg)) != 0) {
713 error("Invalid adapter index");
715 if (pcap_findalldevs(&devpointer, ebuf) < 0)
719 * Look for the devnum-th entry
720 * in the list of devices
724 i < devnum-1 && devpointer != NULL;
725 i++, devpointer = devpointer->next)
727 if (devpointer == NULL)
728 error("Invalid adapter index");
730 device = devpointer->name;
733 #endif /* HAVE_PCAP_FINDALLDEVS */
737 #ifdef HAVE_PCAP_CREATE
741 #endif /* HAVE_PCAP_CREATE */
746 * _IOLBF is the same as _IOFBF in Microsoft's C
747 * libraries; the only alternative they offer
750 * XXX - this should really be checking for MSVC++,
751 * not WIN32, if, for example, MinGW has its own
752 * C library that is more UNIX-compatible.
754 setvbuf(stdout, NULL, _IONBF, 0);
756 #ifdef HAVE_SETLINEBUF
759 setvbuf(stdout, NULL, _IOLBF, 0);
770 if (smiLoadModule(optarg) == 0) {
771 error("could not load MIB module %s", optarg);
775 (void)fprintf(stderr, "%s: ignoring option `-m %s' ",
776 program_name, optarg);
777 (void)fprintf(stderr, "(no libsmi support)\n");
782 /* TCP-MD5 shared secret */
783 #ifndef HAVE_LIBCRYPTO
784 warning("crypto code not compiled in");
807 ++suppress_default_print;
821 snaplen = strtol(optarg, &end, 0);
822 if (optarg == end || *end != '\0'
823 || snaplen < 0 || snaplen > MAXIMUM_SNAPLEN)
824 error("invalid snaplen %s", optarg);
825 else if (snaplen == 0)
826 snaplen = MAXIMUM_SNAPLEN;
839 if (strcasecmp(optarg, "vat") == 0)
841 else if (strcasecmp(optarg, "wb") == 0)
843 else if (strcasecmp(optarg, "rpc") == 0)
845 else if (strcasecmp(optarg, "rtp") == 0)
847 else if (strcasecmp(optarg, "rtcp") == 0)
848 packettype = PT_RTCP;
849 else if (strcasecmp(optarg, "snmp") == 0)
850 packettype = PT_SNMP;
851 else if (strcasecmp(optarg, "cnfp") == 0)
852 packettype = PT_CNFP;
853 else if (strcasecmp(optarg, "tftp") == 0)
854 packettype = PT_TFTP;
855 else if (strcasecmp(optarg, "aodv") == 0)
856 packettype = PT_AODV;
858 error("unknown packet type `%s'", optarg);
865 #ifdef HAVE_PCAP_DUMP_FLUSH
880 Wflag = atoi(optarg);
882 error("invalid number of output files %s", optarg);
883 WflagChars = getWflagChars(Wflag);
888 ++suppress_default_print;
893 ++suppress_default_print;
897 gndo->ndo_dltname = optarg;
899 pcap_datalink_name_to_val(gndo->ndo_dltname);
900 if (gndo->ndo_dlt < 0)
901 error("invalid data link type %s", gndo->ndo_dltname);
904 #if defined(HAVE_PCAP_DEBUG) || defined(HAVE_YYDEBUG)
907 /* Undocumented flag */
908 #ifdef HAVE_PCAP_DEBUG
909 extern int pcap_debug;
920 zflag = strdup(optarg);
929 username = strdup(optarg);
944 case 0: /* Default */
945 case 4: /* Default + Date*/
946 thiszone = gmt2local(0);
949 case 1: /* No time stamp */
950 case 2: /* Unix timeval style */
951 case 3: /* Microseconds since previous packet */
952 case 5: /* Microseconds since first packet */
955 default: /* Not supported */
956 error("only -t, -tt, -ttt, -tttt and -ttttt are supported");
961 /* if run as root, prepare for chrooting */
962 if (getuid() == 0 || geteuid() == 0) {
963 /* future extensibility for cmd-line arguments */
965 chroot_dir = WITH_CHROOT;
970 /* if run as root, prepare for dropping root privileges */
971 if (getuid() == 0 || geteuid() == 0) {
972 /* Run with '-Z root' to restore old behaviour */
974 username = WITH_USER;
978 if (RFileName != NULL) {
980 const char *dlt_name;
984 * We don't need network access, so relinquish any set-UID
985 * or set-GID privileges we have (if any).
987 * We do *not* want set-UID privileges when opening a
988 * trace file, as that might let the user read other
989 * people's trace files (especially if we're set-UID
992 if (setgid(getgid()) != 0 || setuid(getuid()) != 0 )
993 fprintf(stderr, "Warning: setgid/setuid failed !\n");
995 pd = pcap_open_offline(RFileName, ebuf);
998 dlt = pcap_datalink(pd);
999 dlt_name = pcap_datalink_val_to_name(dlt);
1000 if (dlt_name == NULL) {
1001 fprintf(stderr, "reading from file %s, link-type %u\n",
1005 "reading from file %s, link-type %s (%s)\n",
1006 RFileName, dlt_name,
1007 pcap_datalink_val_to_description(dlt));
1012 error("-f and -r options are incompatible");
1014 if (device == NULL) {
1015 device = pcap_lookupdev(ebuf);
1020 if(strlen(device) == 1) //we assume that an ASCII string is always longer than 1 char
1021 { //a Unicode string has a \0 as second byte (so strlen() is 1)
1022 fprintf(stderr, "%s: listening on %ws\n", program_name, device);
1026 fprintf(stderr, "%s: listening on %s\n", program_name, device);
1031 #ifdef HAVE_PCAP_CREATE
1032 pd = pcap_create(device, ebuf);
1036 * Is this an interface that supports monitor mode?
1038 if (pcap_can_set_rfmon(pd) == 1)
1039 supports_monitor_mode = 1;
1041 supports_monitor_mode = 0;
1042 status = pcap_set_snaplen(pd, snaplen);
1044 error("%s: pcap_set_snaplen failed: %s",
1045 device, pcap_statustostr(status));
1046 status = pcap_set_promisc(pd, !pflag);
1048 error("%s: pcap_set_promisc failed: %s",
1049 device, pcap_statustostr(status));
1051 status = pcap_set_rfmon(pd, 1);
1053 error("%s: pcap_set_rfmon failed: %s",
1054 device, pcap_statustostr(status));
1056 status = pcap_set_timeout(pd, 1000);
1058 error("%s: pcap_set_timeout failed: %s",
1059 device, pcap_statustostr(status));
1061 status = pcap_set_buffer_size(pd, Bflag);
1063 error("%s: pcap_set_buffer_size failed: %s",
1064 device, pcap_statustostr(status));
1066 status = pcap_activate(pd);
1069 * pcap_activate() failed.
1071 cp = pcap_geterr(pd);
1072 if (status == PCAP_ERROR)
1074 else if ((status == PCAP_ERROR_NO_SUCH_DEVICE ||
1075 status == PCAP_ERROR_PERM_DENIED) &&
1077 error("%s: %s\n(%s)", device,
1078 pcap_statustostr(status), cp);
1080 error("%s: %s", device,
1081 pcap_statustostr(status));
1082 } else if (status > 0) {
1084 * pcap_activate() succeeded, but it's warning us
1085 * of a problem it had.
1087 cp = pcap_geterr(pd);
1088 if (status == PCAP_WARNING)
1090 else if (status == PCAP_WARNING_PROMISC_NOTSUP &&
1092 warning("%s: %s\n(%s)", device,
1093 pcap_statustostr(status), cp);
1095 warning("%s: %s", device,
1096 pcap_statustostr(status));
1100 pd = pcap_open_live(device, snaplen, !pflag, 1000, ebuf);
1104 warning("%s", ebuf);
1105 #endif /* HAVE_PCAP_CREATE */
1107 * Let user own process after socket has been opened.
1110 if (setgid(getgid()) != 0 || setuid(getuid()) != 0)
1111 fprintf(stderr, "Warning: setgid/setuid failed !\n");
1113 #if !defined(HAVE_PCAP_CREATE) && defined(WIN32)
1115 if(pcap_setbuff(pd, Bflag)==-1){
1116 error("%s", pcap_geterr(pd));
1118 #endif /* !defined(HAVE_PCAP_CREATE) && defined(WIN32) */
1120 show_dlts_and_exit(device, pd);
1121 if (gndo->ndo_dlt >= 0) {
1122 #ifdef HAVE_PCAP_SET_DATALINK
1123 if (pcap_set_datalink(pd, gndo->ndo_dlt) < 0)
1124 error("%s", pcap_geterr(pd));
1127 * We don't actually support changing the
1128 * data link type, so we only let them
1129 * set it to what it already is.
1131 if (gndo->ndo_dlt != pcap_datalink(pd)) {
1132 error("%s is not one of the DLTs supported by this device\n",
1136 (void)fprintf(stderr, "%s: data link type %s\n",
1137 program_name, gndo->ndo_dltname);
1138 (void)fflush(stderr);
1140 i = pcap_snapshot(pd);
1142 warning("snaplen raised from %d to %d", snaplen, i);
1145 if (pcap_lookupnet(device, &localnet, &netmask, ebuf) < 0) {
1148 warning("%s", ebuf);
1152 cmdbuf = read_infile(infile);
1154 cmdbuf = copy_argv(&argv[optind]);
1156 if (pcap_compile(pd, &fcode, cmdbuf, Oflag, netmask) < 0)
1157 error("%s", pcap_geterr(pd));
1160 bpf_dump(&fcode, dflag);
1164 init_addrtoname(localnet, netmask);
1168 (void)setsignal(SIGPIPE, cleanup);
1169 (void)setsignal(SIGTERM, cleanup);
1170 (void)setsignal(SIGINT, cleanup);
1171 (void)setsignal(SIGCHLD, child_cleanup);
1173 /* Cooperate with nohup(1) */
1175 if ((oldhandler = setsignal(SIGHUP, cleanup)) != SIG_DFL)
1176 (void)setsignal(SIGHUP, oldhandler);
1179 if (pcap_setfilter(pd, &fcode) < 0)
1180 error("%s", pcap_geterr(pd));
1183 /* Do not exceed the default NAME_MAX for files. */
1184 dumpinfo.CurrentFileName = (char *)malloc(NAME_MAX + 1);
1186 if (dumpinfo.CurrentFileName == NULL)
1187 error("malloc of dumpinfo.CurrentFileName");
1189 /* We do not need numbering for dumpfiles if Cflag isn't set. */
1191 MakeFilename(dumpinfo.CurrentFileName, WFileName, 0, WflagChars);
1193 MakeFilename(dumpinfo.CurrentFileName, WFileName, 0, 0);
1195 p = pcap_dump_open(pd, dumpinfo.CurrentFileName);
1197 error("%s", pcap_geterr(pd));
1198 if (Cflag != 0 || Gflag != 0) {
1199 callback = dump_packet_and_trunc;
1200 dumpinfo.WFileName = WFileName;
1203 pcap_userdata = (u_char *)&dumpinfo;
1205 callback = dump_packet;
1206 pcap_userdata = (u_char *)p;
1209 type = pcap_datalink(pd);
1210 printinfo.ndo_type = 1;
1211 printinfo.ndo = gndo;
1212 printinfo.p.ndo_printer = lookup_ndo_printer(type);
1213 if (printinfo.p.ndo_printer == NULL) {
1214 printinfo.p.printer = lookup_printer(type);
1215 printinfo.ndo_type = 0;
1216 if (printinfo.p.printer == NULL) {
1217 gndo->ndo_dltname = pcap_datalink_val_to_name(type);
1218 if (gndo->ndo_dltname != NULL)
1219 error("packet printing is not supported for link type %s: use -w",
1222 error("packet printing is not supported for link type %d: use -w", type);
1225 callback = print_packet;
1226 pcap_userdata = (u_char *)&printinfo;
1230 * We cannot do this earlier, because we want to be able to open
1231 * the file (if done) for writing before giving up permissions.
1233 if (getuid() == 0 || geteuid() == 0) {
1234 if (username || chroot_dir)
1235 droproot(username, chroot_dir);
1240 * We can't get statistics when reading from a file rather
1241 * than capturing from a device.
1243 if (RFileName == NULL)
1244 (void)setsignal(SIGINFO, requestinfo);
1247 if (vflag > 0 && WFileName) {
1249 * When capturing to a file, "-v" means tcpdump should,
1250 * every 10 secodns, "v"erbosely report the number of
1253 #ifdef USE_WIN32_MM_TIMER
1254 /* call verbose_stats_dump() each 1000 +/-100msec */
1255 timer_id = timeSetEvent(1000, 100, verbose_stats_dump, 0, TIME_PERIODIC);
1256 setvbuf(stderr, NULL, _IONBF, 0);
1257 #elif defined(HAVE_ALARM)
1258 (void)setsignal(SIGALRM, verbose_stats_dump);
1264 if (RFileName == NULL) {
1266 const char *dlt_name;
1268 if (!vflag && !WFileName) {
1269 (void)fprintf(stderr,
1270 "%s: verbose output suppressed, use -v or -vv for full protocol decode\n",
1273 (void)fprintf(stderr, "%s: ", program_name);
1274 dlt = pcap_datalink(pd);
1275 dlt_name = pcap_datalink_val_to_name(dlt);
1276 if (dlt_name == NULL) {
1277 (void)fprintf(stderr, "listening on %s, link-type %u, capture size %u bytes\n",
1278 device, dlt, snaplen);
1280 (void)fprintf(stderr, "listening on %s, link-type %s (%s), capture size %u bytes\n",
1282 pcap_datalink_val_to_description(dlt), snaplen);
1284 (void)fflush(stderr);
1287 status = pcap_loop(pd, cnt, callback, pcap_userdata);
1288 if (WFileName == NULL) {
1290 * We're printing packets. Flush the printed output,
1291 * so it doesn't get intermingled with error output.
1295 * We got interrupted, so perhaps we didn't
1296 * manage to finish a line we were printing.
1297 * Print an extra newline, just in case.
1301 (void)fflush(stdout);
1307 (void)fprintf(stderr, "%s: pcap_loop: %s\n",
1308 program_name, pcap_geterr(pd));
1310 if (RFileName == NULL) {
1312 * We're doing a live capture. Report the capture
1318 exit(status == -1 ? 1 : 0);
1321 /* make a clean exit on interrupts */
1323 cleanup(int signo _U_)
1325 #ifdef USE_WIN32_MM_TIMER
1327 timeKillEvent(timer_id);
1329 #elif defined(HAVE_ALARM)
1333 #ifdef HAVE_PCAP_BREAKLOOP
1335 * We have "pcap_breakloop()"; use it, so that we do as little
1336 * as possible in the signal handler (it's probably not safe
1337 * to do anything with standard I/O streams in a signal handler -
1338 * the ANSI C standard doesn't say it is).
1343 * We don't have "pcap_breakloop()"; this isn't safe, but
1344 * it's the best we can do. Print the summary if we're
1345 * not reading from a savefile - i.e., if we're doing a
1346 * live capture - and exit.
1348 if (pd != NULL && pcap_file(pd) == NULL) {
1350 * We got interrupted, so perhaps we didn't
1351 * manage to finish a line we were printing.
1352 * Print an extra newline, just in case.
1355 (void)fflush(stdout);
1363 On windows, we do not use a fork, so we do not care less about
1364 waiting a child processes to die
1368 child_cleanup(int signo _U_)
1375 info(register int verbose)
1377 struct pcap_stat stat;
1380 * Older versions of libpcap didn't set ps_ifdrop on some
1381 * platforms; initialize it to 0 to handle that.
1384 if (pcap_stats(pd, &stat) < 0) {
1385 (void)fprintf(stderr, "pcap_stats: %s\n", pcap_geterr(pd));
1391 fprintf(stderr, "%s: ", program_name);
1393 (void)fprintf(stderr, "%u packets captured", packets_captured);
1395 fputs(", ", stderr);
1398 (void)fprintf(stderr, "%u packets received by filter", stat.ps_recv);
1400 fputs(", ", stderr);
1403 (void)fprintf(stderr, "%u packets dropped by kernel", stat.ps_drop);
1404 if (stat.ps_ifdrop != 0) {
1406 fputs(", ", stderr);
1409 (void)fprintf(stderr, "%u packets dropped by interface\n",
1418 compress_savefile(const char *filename)
1423 * Set to lowest priority so that this doesn't disturb the capture
1426 setpriority(PRIO_PROCESS, 0, NZERO - 1);
1428 setpriority(PRIO_PROCESS, 0, 19);
1430 if (execlp(zflag, zflag, filename, (char *)NULL) == -1)
1432 "compress_savefile:execlp(%s, %s): %s\n",
1439 compress_savefile(const char *filename)
1442 "compress_savefile failed. Functionality not implemented under windows\n");
1447 dump_packet_and_trunc(u_char *user, const struct pcap_pkthdr *h, const u_char *sp)
1449 struct dump_info *dump_info;
1455 dump_info = (struct dump_info *)user;
1458 * XXX - this won't force the file to rotate on the specified time
1459 * boundary, but it will rotate on the first packet received after the
1460 * specified Gflag number of seconds. Note: if a Gflag time boundary
1461 * and a Cflag size boundary coincide, the time rotation will occur
1462 * first thereby cancelling the Cflag boundary (since the file should
1466 /* Check if it is time to rotate */
1469 /* Get the current time */
1470 if ((t = time(NULL)) == (time_t)-1) {
1471 error("dump_and_trunc_packet: can't get current_time: %s",
1472 pcap_strerror(errno));
1476 /* If the time is greater than the specified window, rotate */
1477 if (t - Gflag_time >= Gflag) {
1478 /* Update the Gflag_time */
1480 /* Update Gflag_count */
1483 * Close the current file and open a new one.
1485 pcap_dump_close(dump_info->p);
1488 * Compress the file we just closed, if the user asked for it
1491 compress_savefile(dump_info->CurrentFileName);
1494 * Check to see if we've exceeded the Wflag (when
1497 if (Cflag == 0 && Wflag > 0 && Gflag_count >= Wflag) {
1498 (void)fprintf(stderr, "Maximum file limit reached: %d\n",
1503 if (dump_info->CurrentFileName != NULL)
1504 free(dump_info->CurrentFileName);
1505 /* Allocate space for max filename + \0. */
1506 dump_info->CurrentFileName = (char *)malloc(NAME_MAX + 1);
1507 if (dump_info->CurrentFileName == NULL)
1508 error("dump_packet_and_trunc: malloc");
1510 * This is always the first file in the Cflag
1512 * We also don't need numbering if Cflag is not set.
1515 MakeFilename(dump_info->CurrentFileName, dump_info->WFileName, 0,
1518 MakeFilename(dump_info->CurrentFileName, dump_info->WFileName, 0, 0);
1520 dump_info->p = pcap_dump_open(dump_info->pd, dump_info->CurrentFileName);
1521 if (dump_info->p == NULL)
1522 error("%s", pcap_geterr(pd));
1527 * XXX - this won't prevent capture files from getting
1528 * larger than Cflag - the last packet written to the
1529 * file could put it over Cflag.
1531 if (Cflag != 0 && pcap_dump_ftell(dump_info->p) > Cflag) {
1533 * Close the current file and open a new one.
1535 pcap_dump_close(dump_info->p);
1538 * Compress the file we just closed, if the user asked for it
1541 compress_savefile(dump_info->CurrentFileName);
1545 if (Cflag_count >= Wflag)
1548 if (dump_info->CurrentFileName != NULL)
1549 free(dump_info->CurrentFileName);
1550 dump_info->CurrentFileName = (char *)malloc(NAME_MAX + 1);
1551 if (dump_info->CurrentFileName == NULL)
1552 error("dump_packet_and_trunc: malloc");
1553 MakeFilename(dump_info->CurrentFileName, dump_info->WFileName, Cflag_count, WflagChars);
1554 dump_info->p = pcap_dump_open(dump_info->pd, dump_info->CurrentFileName);
1555 if (dump_info->p == NULL)
1556 error("%s", pcap_geterr(pd));
1559 pcap_dump((u_char *)dump_info->p, h, sp);
1560 #ifdef HAVE_PCAP_DUMP_FLUSH
1562 pcap_dump_flush(dump_info->p);
1571 dump_packet(u_char *user, const struct pcap_pkthdr *h, const u_char *sp)
1577 pcap_dump(user, h, sp);
1578 #ifdef HAVE_PCAP_DUMP_FLUSH
1580 pcap_dump_flush((pcap_dumper_t *)user);
1589 print_packet(u_char *user, const struct pcap_pkthdr *h, const u_char *sp)
1591 struct print_info *print_info;
1599 print_info = (struct print_info *)user;
1602 * Some printers want to check that they're not walking off the
1603 * end of the packet.
1604 * Rather than pass it all the way down, we set this global.
1606 snapend = sp + h->caplen;
1608 if(print_info->ndo_type) {
1609 hdrlen = (*print_info->p.ndo_printer)(print_info->ndo, h, sp);
1611 hdrlen = (*print_info->p.printer)(h, sp);
1616 * Print the raw packet data in hex and ASCII.
1620 * Include the link-layer header.
1622 hex_and_ascii_print("\n\t", sp, h->caplen);
1625 * Don't include the link-layer header - and if
1626 * we have nothing past the link-layer header,
1629 if (h->caplen > hdrlen)
1630 hex_and_ascii_print("\n\t", sp + hdrlen,
1631 h->caplen - hdrlen);
1635 * Print the raw packet data in hex.
1639 * Include the link-layer header.
1641 hex_print("\n\t", sp, h->caplen);
1644 * Don't include the link-layer header - and if
1645 * we have nothing past the link-layer header,
1648 if (h->caplen > hdrlen)
1649 hex_print("\n\t", sp + hdrlen,
1650 h->caplen - hdrlen);
1654 * Print the raw packet data in ASCII.
1658 * Include the link-layer header.
1660 ascii_print(sp, h->caplen);
1663 * Don't include the link-layer header - and if
1664 * we have nothing past the link-layer header,
1667 if (h->caplen > hdrlen)
1668 ascii_print(sp + hdrlen, h->caplen - hdrlen);
1681 * XXX - there should really be libpcap calls to get the version
1682 * number as a string (the string would be generated from #defines
1683 * at run time, so that it's not generated from string constants
1684 * in the library, as, on many UNIX systems, those constants would
1685 * be statically linked into the application executable image, and
1686 * would thus reflect the version of libpcap on the system on
1687 * which the application was *linked*, not the system on which it's
1690 * That routine should be documented, unlike the "version[]"
1691 * string, so that UNIX vendors providing their own libpcaps
1692 * don't omit it (as a couple of vendors have...).
1694 * Packet.dll should perhaps also export a routine to return the
1695 * version number of the Packet.dll code, to supply the
1696 * "Wpcap_version" information on Windows.
1698 char WDversion[]="current-cvs.tcpdump.org";
1699 #if !defined(HAVE_GENERATED_VERSION)
1700 char version[]="current-cvs.tcpdump.org";
1702 char pcap_version[]="current-cvs.tcpdump.org";
1703 char Wpcap_version[]="3.1";
1707 * By default, print the specified data out in hex and ASCII.
1710 ndo_default_print(netdissect_options *ndo _U_, const u_char *bp, u_int length)
1712 hex_and_ascii_print("\n\t", bp, length); /* pass on lf and identation string */
1716 default_print(const u_char *bp, u_int length)
1718 ndo_default_print(gndo, bp, length);
1722 RETSIGTYPE requestinfo(int signo _U_)
1732 * Called once each second in verbose mode while dumping to file
1734 #ifdef USE_WIN32_MM_TIMER
1735 void CALLBACK verbose_stats_dump (UINT timer_id _U_, UINT msg _U_, DWORD_PTR arg _U_,
1736 DWORD_PTR dw1 _U_, DWORD_PTR dw2 _U_)
1738 struct pcap_stat stat;
1740 if (infodelay == 0 && pcap_stats(pd, &stat) >= 0)
1741 fprintf(stderr, "Got %u\r", packets_captured);
1743 #elif defined(HAVE_ALARM)
1744 static void verbose_stats_dump(int sig _U_)
1746 struct pcap_stat stat;
1748 if (infodelay == 0 && pcap_stats(pd, &stat) >= 0)
1749 fprintf(stderr, "Got %u\r", packets_captured);
1757 extern char version[];
1758 #ifndef HAVE_PCAP_LIB_VERSION
1759 #if defined(WIN32) || defined(HAVE_PCAP_VERSION)
1760 extern char pcap_version[];
1761 #else /* defined(WIN32) || defined(HAVE_PCAP_VERSION) */
1762 static char pcap_version[] = "unknown";
1763 #endif /* defined(WIN32) || defined(HAVE_PCAP_VERSION) */
1764 #endif /* HAVE_PCAP_LIB_VERSION */
1766 #ifdef HAVE_PCAP_LIB_VERSION
1768 (void)fprintf(stderr, "%s version %s, based on tcpdump version %s\n", program_name, WDversion, version);
1770 (void)fprintf(stderr, "%s version %s\n", program_name, version);
1772 (void)fprintf(stderr, "%s\n",pcap_lib_version());
1773 #else /* HAVE_PCAP_LIB_VERSION */
1775 (void)fprintf(stderr, "%s version %s, based on tcpdump version %s\n", program_name, WDversion, version);
1776 (void)fprintf(stderr, "WinPcap version %s, based on libpcap version %s\n",Wpcap_version, pcap_version);
1778 (void)fprintf(stderr, "%s version %s\n", program_name, version);
1779 (void)fprintf(stderr, "libpcap version %s\n", pcap_version);
1781 #endif /* HAVE_PCAP_LIB_VERSION */
1782 (void)fprintf(stderr,
1783 "Usage: %s [-aAbd" D_FLAG "ef" I_FLAG "KlLnNOpqRStu" U_FLAG "vxX]" B_FLAG_USAGE " [ -c count ]\n", program_name);
1784 (void)fprintf(stderr,
1785 "\t\t[ -C file_size ] [ -E algo:secret ] [ -F file ] [ -G seconds ]\n");
1786 (void)fprintf(stderr,
1787 "\t\t[ -i interface ] [ -M secret ] [ -r file ]\n");
1788 (void)fprintf(stderr,
1789 "\t\t[ -s snaplen ] [ -T type ] [ -w file ] [ -W filecount ]\n");
1790 (void)fprintf(stderr,
1791 "\t\t[ -y datalinktype ] [ -z command ] [ -Z user ]\n");
1792 (void)fprintf(stderr,
1793 "\t\t[ expression ]\n");
1801 ndo_error(netdissect_options *ndo _U_, const char *fmt, ...)
1805 (void)fprintf(stderr, "%s: ", program_name);
1807 (void)vfprintf(stderr, fmt, ap);
1811 if (fmt[-1] != '\n')
1812 (void)fputc('\n', stderr);
1820 ndo_warning(netdissect_options *ndo _U_, const char *fmt, ...)
1824 (void)fprintf(stderr, "%s: WARNING: ", program_name);
1826 (void)vfprintf(stderr, fmt, ap);
1830 if (fmt[-1] != '\n')
1831 (void)fputc('\n', stderr);