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>
79 /* capabilities convinience library */
82 #endif /* HAVE_CAP_NG_H */
84 #include "netdissect.h"
85 #include "interface.h"
86 #include "addrtoname.h"
88 #include "setsignal.h"
89 #include "gmt2local.h"
90 #include "pcap-missing.h"
97 #define SIGNAL_REQ_INFO SIGINFO
99 #define SIGNAL_REQ_INFO SIGUSR1
102 netdissect_options Gndo;
103 netdissect_options *gndo = &Gndo;
105 static int dflag; /* print filter code */
106 static int Lflag; /* list available data link types and exit */
107 #ifdef HAVE_PCAP_SET_TSTAMP_TYPE
108 static int Jflag; /* list available time stamp types */
110 static char *zflag = NULL; /* compress each savefile using a specified command (like gzip or bzip2) */
112 static int infodelay;
113 static int infoprint;
117 int32_t thiszone; /* seconds offset from gmt to local time */
120 static RETSIGTYPE cleanup(int);
121 static RETSIGTYPE child_cleanup(int);
122 static void usage(void) __attribute__((noreturn));
123 static void show_dlts_and_exit(const char *device, pcap_t *pd) __attribute__((noreturn));
125 static void print_packet(u_char *, const struct pcap_pkthdr *, const u_char *);
126 static void ndo_default_print(netdissect_options *, const u_char *, u_int);
127 static void dump_packet_and_trunc(u_char *, const struct pcap_pkthdr *, const u_char *);
128 static void dump_packet(u_char *, const struct pcap_pkthdr *, const u_char *);
129 static void droproot(const char *, const char *);
130 static void ndo_error(netdissect_options *ndo, const char *fmt, ...)
131 __attribute__ ((noreturn, format (printf, 2, 3)));
132 static void ndo_warning(netdissect_options *ndo, const char *fmt, ...);
134 #ifdef SIGNAL_REQ_INFO
135 RETSIGTYPE requestinfo(int);
138 #if defined(USE_WIN32_MM_TIMER)
139 #include <MMsystem.h>
140 static UINT timer_id;
141 static void CALLBACK verbose_stats_dump(UINT, UINT, DWORD_PTR, DWORD_PTR, DWORD_PTR);
142 #elif defined(HAVE_ALARM)
143 static void verbose_stats_dump(int sig);
146 static void info(int);
147 static u_int packets_captured;
161 static struct printer printers[] = {
162 { arcnet_if_print, DLT_ARCNET },
163 #ifdef DLT_ARCNET_LINUX
164 { arcnet_linux_if_print, DLT_ARCNET_LINUX },
166 { token_if_print, DLT_IEEE802 },
168 { lane_if_print, DLT_LANE8023 },
171 { cip_if_print, DLT_CIP },
174 { cip_if_print, DLT_ATM_CLIP },
176 { sl_if_print, DLT_SLIP },
177 #ifdef DLT_SLIP_BSDOS
178 { sl_bsdos_if_print, DLT_SLIP_BSDOS },
180 { ppp_if_print, DLT_PPP },
181 #ifdef DLT_PPP_WITHDIRECTION
182 { ppp_if_print, DLT_PPP_WITHDIRECTION },
185 { ppp_bsdos_if_print, DLT_PPP_BSDOS },
187 { fddi_if_print, DLT_FDDI },
188 { null_if_print, DLT_NULL },
190 { null_if_print, DLT_LOOP },
192 { raw_if_print, DLT_RAW },
193 { atm_if_print, DLT_ATM_RFC1483 },
195 { chdlc_if_print, DLT_C_HDLC },
198 { chdlc_if_print, DLT_HDLC },
200 #ifdef DLT_PPP_SERIAL
201 { ppp_hdlc_if_print, DLT_PPP_SERIAL },
204 { pppoe_if_print, DLT_PPP_ETHER },
207 { sll_if_print, DLT_LINUX_SLL },
209 #ifdef DLT_IEEE802_11
210 { ieee802_11_if_print, DLT_IEEE802_11},
213 { ltalk_if_print, DLT_LTALK },
215 #if defined(DLT_PFLOG) && defined(HAVE_NET_PFVAR_H)
216 { pflog_if_print, DLT_PFLOG },
219 { fr_if_print, DLT_FR },
222 { fr_if_print, DLT_FRELAY },
225 { sunatm_if_print, DLT_SUNATM },
227 #ifdef DLT_IP_OVER_FC
228 { ipfc_if_print, DLT_IP_OVER_FC },
230 #ifdef DLT_PRISM_HEADER
231 { prism_if_print, DLT_PRISM_HEADER },
233 #ifdef DLT_IEEE802_11_RADIO
234 { ieee802_11_radio_if_print, DLT_IEEE802_11_RADIO },
237 { enc_if_print, DLT_ENC },
239 #ifdef DLT_SYMANTEC_FIREWALL
240 { symantec_if_print, DLT_SYMANTEC_FIREWALL },
242 #ifdef DLT_APPLE_IP_OVER_IEEE1394
243 { ap1394_if_print, DLT_APPLE_IP_OVER_IEEE1394 },
245 #ifdef DLT_IEEE802_11_RADIO_AVS
246 { ieee802_11_radio_avs_if_print, DLT_IEEE802_11_RADIO_AVS },
248 #ifdef DLT_JUNIPER_ATM1
249 { juniper_atm1_print, DLT_JUNIPER_ATM1 },
251 #ifdef DLT_JUNIPER_ATM2
252 { juniper_atm2_print, DLT_JUNIPER_ATM2 },
254 #ifdef DLT_JUNIPER_MFR
255 { juniper_mfr_print, DLT_JUNIPER_MFR },
257 #ifdef DLT_JUNIPER_MLFR
258 { juniper_mlfr_print, DLT_JUNIPER_MLFR },
260 #ifdef DLT_JUNIPER_MLPPP
261 { juniper_mlppp_print, DLT_JUNIPER_MLPPP },
263 #ifdef DLT_JUNIPER_PPPOE
264 { juniper_pppoe_print, DLT_JUNIPER_PPPOE },
266 #ifdef DLT_JUNIPER_PPPOE_ATM
267 { juniper_pppoe_atm_print, DLT_JUNIPER_PPPOE_ATM },
269 #ifdef DLT_JUNIPER_GGSN
270 { juniper_ggsn_print, DLT_JUNIPER_GGSN },
272 #ifdef DLT_JUNIPER_ES
273 { juniper_es_print, DLT_JUNIPER_ES },
275 #ifdef DLT_JUNIPER_MONITOR
276 { juniper_monitor_print, DLT_JUNIPER_MONITOR },
278 #ifdef DLT_JUNIPER_SERVICES
279 { juniper_services_print, DLT_JUNIPER_SERVICES },
281 #ifdef DLT_JUNIPER_ETHER
282 { juniper_ether_print, DLT_JUNIPER_ETHER },
284 #ifdef DLT_JUNIPER_PPP
285 { juniper_ppp_print, DLT_JUNIPER_PPP },
287 #ifdef DLT_JUNIPER_FRELAY
288 { juniper_frelay_print, DLT_JUNIPER_FRELAY },
290 #ifdef DLT_JUNIPER_CHDLC
291 { juniper_chdlc_print, DLT_JUNIPER_CHDLC },
294 { mfr_if_print, DLT_MFR },
296 #if defined(DLT_BLUETOOTH_HCI_H4_WITH_PHDR) && defined(HAVE_PCAP_BLUETOOTH_H)
297 { bt_if_print, DLT_BLUETOOTH_HCI_H4_WITH_PHDR},
299 #ifdef HAVE_PCAP_USB_H
301 { usb_linux_48_byte_print, DLT_USB_LINUX},
302 #endif /* DLT_USB_LINUX */
303 #ifdef DLT_USB_LINUX_MMAPPED
304 { usb_linux_64_byte_print, DLT_USB_LINUX_MMAPPED},
305 #endif /* DLT_USB_LINUX_MMAPPED */
306 #endif /* HAVE_PCAP_USB_H */
308 { raw_if_print, DLT_IPV4 },
311 { raw_if_print, DLT_IPV6 },
316 static struct ndo_printer ndo_printers[] = {
317 { ether_if_print, DLT_EN10MB },
319 { ipnet_if_print, DLT_IPNET },
321 #ifdef DLT_IEEE802_15_4
322 { ieee802_15_4_if_print, DLT_IEEE802_15_4 },
324 #ifdef DLT_IEEE802_15_4_NOFCS
325 { ieee802_15_4_if_print, DLT_IEEE802_15_4_NOFCS },
328 { ppi_if_print, DLT_PPI },
330 #ifdef DLT_NETANALYZER
331 { netanalyzer_if_print, DLT_NETANALYZER },
333 #ifdef DLT_NETANALYZER_TRANSPARENT
334 { netanalyzer_transparent_if_print, DLT_NETANALYZER_TRANSPARENT },
340 lookup_printer(int type)
344 for (p = printers; p->f; ++p)
353 lookup_ndo_printer(int type)
355 struct ndo_printer *p;
357 for (p = ndo_printers; p->f; ++p)
367 static int supports_monitor_mode;
374 netdissect_options *ndo;
377 if_ndo_printer ndo_printer;
384 char *CurrentFileName;
389 #ifdef HAVE_PCAP_SET_TSTAMP_TYPE
391 show_tstamp_types_and_exit(const char *device, pcap_t *pd)
394 int *tstamp_types = 0;
395 const char *tstamp_type_name;
398 n_tstamp_types = pcap_list_tstamp_types(pd, &tstamp_types);
399 if (n_tstamp_types < 0)
400 error("%s", pcap_geterr(pd));
402 if (n_tstamp_types == 0) {
403 fprintf(stderr, "Time stamp type cannot be set for %s\n",
407 fprintf(stderr, "Time stamp types for %s (use option -j to set):\n",
409 for (i = 0; i < n_tstamp_types; i++) {
410 tstamp_type_name = pcap_tstamp_type_val_to_name(tstamp_types[i]);
411 if (tstamp_type_name != NULL) {
412 (void) fprintf(stderr, " %s (%s)\n", tstamp_type_name,
413 pcap_tstamp_type_val_to_description(tstamp_types[i]));
415 (void) fprintf(stderr, " %d\n", tstamp_types[i]);
418 pcap_free_tstamp_types(tstamp_types);
424 show_dlts_and_exit(const char *device, pcap_t *pd)
428 const char *dlt_name;
430 n_dlts = pcap_list_datalinks(pd, &dlts);
432 error("%s", pcap_geterr(pd));
433 else if (n_dlts == 0 || !dlts)
434 error("No data link types.");
437 * If the interface is known to support monitor mode, indicate
438 * whether these are the data link types available when not in
439 * monitor mode, if -I wasn't specified, or when in monitor mode,
440 * when -I was specified (the link-layer types available in
441 * monitor mode might be different from the ones available when
442 * not in monitor mode).
444 if (supports_monitor_mode)
445 (void) fprintf(stderr, "Data link types for %s %s (use option -y to set):\n",
447 Iflag ? "when in monitor mode" : "when not in monitor mode");
449 (void) fprintf(stderr, "Data link types for %s (use option -y to set):\n",
452 while (--n_dlts >= 0) {
453 dlt_name = pcap_datalink_val_to_name(dlts[n_dlts]);
454 if (dlt_name != NULL) {
455 (void) fprintf(stderr, " %s (%s)", dlt_name,
456 pcap_datalink_val_to_description(dlts[n_dlts]));
459 * OK, does tcpdump handle that type?
461 if (lookup_printer(dlts[n_dlts]) == NULL
462 && lookup_ndo_printer(dlts[n_dlts]) == NULL)
463 (void) fprintf(stderr, " (printing not supported)");
464 fprintf(stderr, "\n");
466 (void) fprintf(stderr, " DLT %d (printing not supported)\n",
470 #ifdef HAVE_PCAP_FREE_DATALINKS
471 pcap_free_datalinks(dlts);
477 * Set up flags that might or might not be supported depending on the
478 * version of libpcap we're using.
480 #if defined(HAVE_PCAP_CREATE) || defined(WIN32)
482 #define B_FLAG_USAGE " [ -B size ]"
483 #else /* defined(HAVE_PCAP_CREATE) || defined(WIN32) */
486 #endif /* defined(HAVE_PCAP_CREATE) || defined(WIN32) */
488 #ifdef HAVE_PCAP_CREATE
490 #else /* HAVE_PCAP_CREATE */
492 #endif /* HAVE_PCAP_CREATE */
494 #ifdef HAVE_PCAP_SET_TSTAMP_TYPE
496 #define j_FLAG_USAGE " [ -j tstamptype ]"
498 #else /* PCAP_ERROR_TSTAMP_TYPE_NOTSUP */
502 #endif /* PCAP_ERROR_TSTAMP_TYPE_NOTSUP */
504 #ifdef HAVE_PCAP_FINDALLDEVS
505 #ifndef HAVE_PCAP_IF_T
506 #undef HAVE_PCAP_FINDALLDEVS
510 #ifdef HAVE_PCAP_FINDALLDEVS
516 #ifdef HAVE_PCAP_DUMP_FLUSH
523 /* Drop root privileges and chroot if necessary */
525 droproot(const char *username, const char *chroot_dir)
527 struct passwd *pw = NULL;
529 if (chroot_dir && !username) {
530 fprintf(stderr, "tcpdump: Chroot without dropping root is insecure\n");
534 pw = getpwnam(username);
537 if (chroot(chroot_dir) != 0 || chdir ("/") != 0) {
538 fprintf(stderr, "tcpdump: Couldn't chroot/chdir to '%.64s': %s\n",
539 chroot_dir, pcap_strerror(errno));
544 int ret = capng_change_id(pw->pw_uid, pw->pw_gid, CAPNG_NO_FLAG);
546 printf("error : ret %d\n", ret);
548 /* We don't need CAP_SETUID and CAP_SETGID */
549 capng_update(CAPNG_DROP, CAPNG_EFFECTIVE, CAP_SETUID);
550 capng_update(CAPNG_DROP, CAPNG_EFFECTIVE, CAP_SETUID);
551 capng_update(CAPNG_DROP, CAPNG_PERMITTED, CAP_SETUID);
552 capng_update(CAPNG_DROP, CAPNG_PERMITTED, CAP_SETUID);
553 capng_apply(CAPNG_SELECT_BOTH);
556 if (initgroups(pw->pw_name, pw->pw_gid) != 0 ||
557 setgid(pw->pw_gid) != 0 || setuid(pw->pw_uid) != 0) {
558 fprintf(stderr, "tcpdump: Couldn't change to '%.32s' uid=%lu gid=%lu: %s\n",
560 (unsigned long)pw->pw_uid,
561 (unsigned long)pw->pw_gid,
562 pcap_strerror(errno));
565 #endif /* HAVE_CAP_NG_H */
568 fprintf(stderr, "tcpdump: Couldn't find user '%.32s'\n",
591 MakeFilename(char *buffer, char *orig_name, int cnt, int max_chars)
593 char *filename = malloc(PATH_MAX + 1);
594 if (filename == NULL)
595 error("Makefilename: malloc");
597 /* Process with strftime if Gflag is set. */
601 /* Convert Gflag_time to a usable format */
602 if ((local_tm = localtime(&Gflag_time)) == NULL) {
603 error("MakeTimedFilename: localtime");
606 /* There's no good way to detect an error in strftime since a return
607 * value of 0 isn't necessarily failure.
609 strftime(filename, PATH_MAX, orig_name, local_tm);
611 strncpy(filename, orig_name, PATH_MAX);
614 if (cnt == 0 && max_chars == 0)
615 strncpy(buffer, filename, PATH_MAX + 1);
617 if (snprintf(buffer, PATH_MAX + 1, "%s%0*d", filename, max_chars, cnt) > PATH_MAX)
618 /* Report an error if the filename is too large */
619 error("too many output files or filename is too long (> %d)", PATH_MAX);
623 static int tcpdump_printf(netdissect_options *ndo _U_,
624 const char *fmt, ...)
631 ret=vfprintf(stdout, fmt, args);
637 static struct print_info
638 get_print_info(int type)
640 struct print_info printinfo;
642 printinfo.ndo_type = 1;
643 printinfo.ndo = gndo;
644 printinfo.p.ndo_printer = lookup_ndo_printer(type);
645 if (printinfo.p.ndo_printer == NULL) {
646 printinfo.p.printer = lookup_printer(type);
647 printinfo.ndo_type = 0;
648 if (printinfo.p.printer == NULL) {
649 gndo->ndo_dltname = pcap_datalink_val_to_name(type);
650 if (gndo->ndo_dltname != NULL)
651 error("packet printing is not supported for link type %s: use -w",
654 error("packet printing is not supported for link type %d: use -w", type);
661 get_next_file(FILE *VFile, char *ptr)
665 ret = fgets(ptr, PATH_MAX, VFile);
669 if (ptr[strlen(ptr) - 1] == '\n')
670 ptr[strlen(ptr) - 1] = '\0';
676 main(int argc, char **argv)
678 register int cnt, op, i;
679 bpf_u_int32 localnet, netmask;
680 register char *cp, *infile, *cmdbuf, *device, *RFileName, *VFileName, *WFileName;
681 pcap_handler callback;
685 const char *dlt_name;
686 struct bpf_program fcode;
688 RETSIGTYPE (*oldhandler)(int);
690 struct print_info printinfo;
691 struct dump_info dumpinfo;
692 u_char *pcap_userdata;
693 char ebuf[PCAP_ERRBUF_SIZE];
694 char VFileLine[PATH_MAX + 1];
695 char *username = NULL;
696 char *chroot_dir = NULL;
699 #ifdef HAVE_PCAP_FINDALLDEVS
700 pcap_if_t *devpointer;
706 if(wsockinit() != 0) return 1;
709 jflag=-1; /* not set */
713 gndo->ndo_default_print=ndo_default_print;
714 gndo->ndo_printf=tcpdump_printf;
715 gndo->ndo_error=ndo_error;
716 gndo->ndo_warning=ndo_warning;
717 gndo->ndo_snaplen = DEFAULT_SNAPLEN;
727 if ((cp = strrchr(argv[0], '/')) != NULL)
728 program_name = cp + 1;
730 program_name = argv[0];
732 if (abort_on_misalignment(ebuf, sizeof(ebuf)) < 0)
740 (op = getopt(argc, argv, "aAb" B_FLAG "c:C:d" D_FLAG "eE:fF:G:hHi:" I_FLAG j_FLAG J_FLAG "KlLm:M:nNOpqr:Rs:StT:u" U_FLAG "V:vw:W:xXy:Yz:Z:")) != -1)
744 /* compatibility for old -a */
755 #if defined(HAVE_PCAP_CREATE) || defined(WIN32)
757 Bflag = atoi(optarg)*1024;
759 error("invalid packet buffer size %s", optarg);
761 #endif /* defined(HAVE_PCAP_CREATE) || defined(WIN32) */
766 error("invalid packet count %s", optarg);
770 Cflag = atoi(optarg) * 1000000;
772 error("invalid file size %s", optarg);
779 #ifdef HAVE_PCAP_FINDALLDEVS
781 if (pcap_findalldevs(&devpointer, ebuf) < 0)
784 for (i = 0; devpointer != 0; i++) {
785 printf("%d.%s", i+1, devpointer->name);
786 if (devpointer->description != NULL)
787 printf(" (%s)", devpointer->description);
789 devpointer = devpointer->next;
793 #endif /* HAVE_PCAP_FINDALLDEVS */
804 #ifndef HAVE_LIBCRYPTO
805 warning("crypto code not compiled in");
807 gndo->ndo_espsecret = optarg;
819 Gflag = atoi(optarg);
821 error("invalid number of seconds %s", optarg);
823 /* We will create one file initially. */
826 /* Grab the current time for rotation use. */
827 if ((Gflag_time = time(NULL)) == (time_t)-1) {
828 error("main: can't get current time: %s",
829 pcap_strerror(errno));
842 if (optarg[0] == '0' && optarg[1] == 0)
843 error("Invalid adapter index");
845 #ifdef HAVE_PCAP_FINDALLDEVS
847 * If the argument is a number, treat it as
848 * an index into the list of adapters, as
849 * printed by "tcpdump -D".
851 * This should be OK on UNIX systems, as interfaces
852 * shouldn't have names that begin with digits.
853 * It can be useful on Windows, where more than
854 * one interface can have the same name.
856 devnum = strtol(optarg, &end, 10);
857 if (optarg != end && *end == '\0') {
859 error("Invalid adapter index");
861 if (pcap_findalldevs(&devpointer, ebuf) < 0)
865 * Look for the devnum-th entry
866 * in the list of devices
870 i < devnum-1 && devpointer != NULL;
871 i++, devpointer = devpointer->next)
873 if (devpointer == NULL)
874 error("Invalid adapter index");
876 device = devpointer->name;
879 #endif /* HAVE_PCAP_FINDALLDEVS */
883 #ifdef HAVE_PCAP_CREATE
887 #endif /* HAVE_PCAP_CREATE */
889 #ifdef HAVE_PCAP_SET_TSTAMP_TYPE
891 jflag = pcap_tstamp_type_name_to_val(optarg);
893 error("invalid time stamp type %s", optarg);
904 * _IOLBF is the same as _IOFBF in Microsoft's C
905 * libraries; the only alternative they offer
908 * XXX - this should really be checking for MSVC++,
909 * not WIN32, if, for example, MinGW has its own
910 * C library that is more UNIX-compatible.
912 setvbuf(stdout, NULL, _IONBF, 0);
914 #ifdef HAVE_SETLINEBUF
917 setvbuf(stdout, NULL, _IOLBF, 0);
928 if (smiLoadModule(optarg) == 0) {
929 error("could not load MIB module %s", optarg);
933 (void)fprintf(stderr, "%s: ignoring option `-m %s' ",
934 program_name, optarg);
935 (void)fprintf(stderr, "(no libsmi support)\n");
940 /* TCP-MD5 shared secret */
941 #ifndef HAVE_LIBCRYPTO
942 warning("crypto code not compiled in");
965 ++suppress_default_print;
977 snaplen = strtol(optarg, &end, 0);
978 if (optarg == end || *end != '\0'
979 || snaplen < 0 || snaplen > MAXIMUM_SNAPLEN)
980 error("invalid snaplen %s", optarg);
981 else if (snaplen == 0)
982 snaplen = MAXIMUM_SNAPLEN;
994 if (strcasecmp(optarg, "vat") == 0)
996 else if (strcasecmp(optarg, "wb") == 0)
998 else if (strcasecmp(optarg, "rpc") == 0)
1000 else if (strcasecmp(optarg, "rtp") == 0)
1001 packettype = PT_RTP;
1002 else if (strcasecmp(optarg, "rtcp") == 0)
1003 packettype = PT_RTCP;
1004 else if (strcasecmp(optarg, "snmp") == 0)
1005 packettype = PT_SNMP;
1006 else if (strcasecmp(optarg, "cnfp") == 0)
1007 packettype = PT_CNFP;
1008 else if (strcasecmp(optarg, "tftp") == 0)
1009 packettype = PT_TFTP;
1010 else if (strcasecmp(optarg, "aodv") == 0)
1011 packettype = PT_AODV;
1012 else if (strcasecmp(optarg, "carp") == 0)
1013 packettype = PT_CARP;
1014 else if (strcasecmp(optarg, "radius") == 0)
1015 packettype = PT_RADIUS;
1016 else if (strcasecmp(optarg, "zmtp1") == 0)
1017 packettype = PT_ZMTP1;
1018 else if (strcasecmp(optarg, "vxlan") == 0)
1019 packettype = PT_VXLAN;
1021 error("unknown packet type `%s'", optarg);
1028 #ifdef HAVE_PCAP_DUMP_FLUSH
1047 Wflag = atoi(optarg);
1049 error("invalid number of output files %s", optarg);
1050 WflagChars = getWflagChars(Wflag);
1055 ++suppress_default_print;
1060 ++suppress_default_print;
1064 gndo->ndo_dltname = optarg;
1066 pcap_datalink_name_to_val(gndo->ndo_dltname);
1067 if (gndo->ndo_dlt < 0)
1068 error("invalid data link type %s", gndo->ndo_dltname);
1071 #if defined(HAVE_PCAP_DEBUG) || defined(HAVE_YYDEBUG)
1074 /* Undocumented flag */
1075 #ifdef HAVE_PCAP_DEBUG
1076 extern int pcap_debug;
1087 zflag = strdup(optarg);
1096 username = strdup(optarg);
1111 case 0: /* Default */
1112 case 4: /* Default + Date*/
1113 thiszone = gmt2local(0);
1116 case 1: /* No time stamp */
1117 case 2: /* Unix timeval style */
1118 case 3: /* Microseconds since previous packet */
1119 case 5: /* Microseconds since first packet */
1122 default: /* Not supported */
1123 error("only -t, -tt, -ttt, -tttt and -ttttt are supported");
1127 if (fflag != 0 && (VFileName != NULL || RFileName != NULL))
1128 error("-f can not be used with -V or -r");
1130 if (VFileName != NULL && RFileName != NULL)
1131 error("-V and -r are mutually exclusive.");
1134 /* if run as root, prepare for chrooting */
1135 if (getuid() == 0 || geteuid() == 0) {
1136 /* future extensibility for cmd-line arguments */
1138 chroot_dir = WITH_CHROOT;
1143 /* if run as root, prepare for dropping root privileges */
1144 if (getuid() == 0 || geteuid() == 0) {
1145 /* Run with '-Z root' to restore old behaviour */
1147 username = WITH_USER;
1151 if (RFileName != NULL || VFileName != NULL) {
1153 * If RFileName is non-null, it's the pathname of a
1154 * savefile to read. If VFileName is non-null, it's
1155 * the pathname of a file containing a list of pathnames
1156 * (one per line) of savefiles to read.
1158 * In either case, we're reading a savefile, not doing
1163 * We don't need network access, so relinquish any set-UID
1164 * or set-GID privileges we have (if any).
1166 * We do *not* want set-UID privileges when opening a
1167 * trace file, as that might let the user read other
1168 * people's trace files (especially if we're set-UID
1171 if (setgid(getgid()) != 0 || setuid(getuid()) != 0 )
1172 fprintf(stderr, "Warning: setgid/setuid failed !\n");
1174 if (VFileName != NULL) {
1175 if (VFileName[0] == '-' && VFileName[1] == '\0')
1178 VFile = fopen(VFileName, "r");
1181 error("Unable to open file: %s\n", strerror(errno));
1183 ret = get_next_file(VFile, VFileLine);
1185 error("Nothing in %s\n", VFileName);
1186 RFileName = VFileLine;
1189 pd = pcap_open_offline(RFileName, ebuf);
1192 dlt = pcap_datalink(pd);
1193 dlt_name = pcap_datalink_val_to_name(dlt);
1194 if (dlt_name == NULL) {
1195 fprintf(stderr, "reading from file %s, link-type %u\n",
1199 "reading from file %s, link-type %s (%s)\n",
1200 RFileName, dlt_name,
1201 pcap_datalink_val_to_description(dlt));
1207 * We're doing a live capture.
1209 if (device == NULL) {
1210 device = pcap_lookupdev(ebuf);
1216 * Print a message to the standard error on Windows.
1217 * XXX - why do it here, with a different message?
1219 if(strlen(device) == 1) //we assume that an ASCII string is always longer than 1 char
1220 { //a Unicode string has a \0 as second byte (so strlen() is 1)
1221 fprintf(stderr, "%s: listening on %ws\n", program_name, device);
1225 fprintf(stderr, "%s: listening on %s\n", program_name, device);
1230 #ifdef HAVE_PCAP_CREATE
1231 pd = pcap_create(device, ebuf);
1234 #ifdef HAVE_PCAP_SET_TSTAMP_TYPE
1236 show_tstamp_types_and_exit(device, pd);
1239 * Is this an interface that supports monitor mode?
1241 if (pcap_can_set_rfmon(pd) == 1)
1242 supports_monitor_mode = 1;
1244 supports_monitor_mode = 0;
1245 status = pcap_set_snaplen(pd, snaplen);
1247 error("%s: Can't set snapshot length: %s",
1248 device, pcap_statustostr(status));
1249 status = pcap_set_promisc(pd, !pflag);
1251 error("%s: Can't set promiscuous mode: %s",
1252 device, pcap_statustostr(status));
1254 status = pcap_set_rfmon(pd, 1);
1256 error("%s: Can't set monitor mode: %s",
1257 device, pcap_statustostr(status));
1259 status = pcap_set_timeout(pd, 1000);
1261 error("%s: pcap_set_timeout failed: %s",
1262 device, pcap_statustostr(status));
1264 status = pcap_set_buffer_size(pd, Bflag);
1266 error("%s: Can't set buffer size: %s",
1267 device, pcap_statustostr(status));
1269 #ifdef HAVE_PCAP_SET_TSTAMP_TYPE
1271 status = pcap_set_tstamp_type(pd, jflag);
1273 error("%s: Can't set time stamp type: %s",
1274 device, pcap_statustostr(status));
1277 status = pcap_activate(pd);
1280 * pcap_activate() failed.
1282 cp = pcap_geterr(pd);
1283 if (status == PCAP_ERROR)
1285 else if ((status == PCAP_ERROR_NO_SUCH_DEVICE ||
1286 status == PCAP_ERROR_PERM_DENIED) &&
1288 error("%s: %s\n(%s)", device,
1289 pcap_statustostr(status), cp);
1291 error("%s: %s", device,
1292 pcap_statustostr(status));
1293 } else if (status > 0) {
1295 * pcap_activate() succeeded, but it's warning us
1296 * of a problem it had.
1298 cp = pcap_geterr(pd);
1299 if (status == PCAP_WARNING)
1301 else if (status == PCAP_WARNING_PROMISC_NOTSUP &&
1303 warning("%s: %s\n(%s)", device,
1304 pcap_statustostr(status), cp);
1306 warning("%s: %s", device,
1307 pcap_statustostr(status));
1311 pd = pcap_open_live(device, snaplen, !pflag, 1000, ebuf);
1315 warning("%s", ebuf);
1316 #endif /* HAVE_PCAP_CREATE */
1318 * Let user own process after socket has been opened.
1321 if (setgid(getgid()) != 0 || setuid(getuid()) != 0)
1322 fprintf(stderr, "Warning: setgid/setuid failed !\n");
1324 #if !defined(HAVE_PCAP_CREATE) && defined(WIN32)
1326 if(pcap_setbuff(pd, Bflag)==-1){
1327 error("%s", pcap_geterr(pd));
1329 #endif /* !defined(HAVE_PCAP_CREATE) && defined(WIN32) */
1331 show_dlts_and_exit(device, pd);
1332 if (gndo->ndo_dlt >= 0) {
1333 #ifdef HAVE_PCAP_SET_DATALINK
1334 if (pcap_set_datalink(pd, gndo->ndo_dlt) < 0)
1335 error("%s", pcap_geterr(pd));
1338 * We don't actually support changing the
1339 * data link type, so we only let them
1340 * set it to what it already is.
1342 if (gndo->ndo_dlt != pcap_datalink(pd)) {
1343 error("%s is not one of the DLTs supported by this device\n",
1347 (void)fprintf(stderr, "%s: data link type %s\n",
1348 program_name, gndo->ndo_dltname);
1349 (void)fflush(stderr);
1351 i = pcap_snapshot(pd);
1353 warning("snaplen raised from %d to %d", snaplen, i);
1356 if (pcap_lookupnet(device, &localnet, &netmask, ebuf) < 0) {
1359 warning("%s", ebuf);
1363 cmdbuf = read_infile(infile);
1365 cmdbuf = copy_argv(&argv[optind]);
1367 if (pcap_compile(pd, &fcode, cmdbuf, Oflag, netmask) < 0)
1368 error("%s", pcap_geterr(pd));
1370 bpf_dump(&fcode, dflag);
1375 init_addrtoname(localnet, netmask);
1379 (void)setsignal(SIGPIPE, cleanup);
1380 (void)setsignal(SIGTERM, cleanup);
1381 (void)setsignal(SIGINT, cleanup);
1383 #if defined(HAVE_FORK) || defined(HAVE_VFORK)
1384 (void)setsignal(SIGCHLD, child_cleanup);
1386 /* Cooperate with nohup(1) */
1388 if ((oldhandler = setsignal(SIGHUP, cleanup)) != SIG_DFL)
1389 (void)setsignal(SIGHUP, oldhandler);
1394 * If a user name was specified with "-Z", attempt to switch to
1395 * that user's UID. This would probably be used with sudo,
1396 * to allow tcpdump to be run in a special restricted
1397 * account (if you just want to allow users to open capture
1398 * devices, and can't just give users that permission,
1399 * you'd make tcpdump set-UID or set-GID).
1401 * Tcpdump doesn't necessarily write only to one savefile;
1402 * the general only way to allow a -Z instance to write to
1403 * savefiles as the user under whose UID it's run, rather
1404 * than as the user specified with -Z, would thus be to switch
1405 * to the original user ID before opening a capture file and
1406 * then switch back to the -Z user ID after opening the savefile.
1407 * Switching to the -Z user ID only after opening the first
1408 * savefile doesn't handle the general case.
1411 #ifdef HAVE_CAP_NG_H
1412 /* We are running as root and we will be writing to savefile */
1413 if ((getuid() == 0 || geteuid() == 0) && WFileName) {
1415 /* Drop all capabilities from effective set */
1416 capng_clear(CAPNG_EFFECTIVE);
1417 /* Add capabilities we will need*/
1418 capng_update(CAPNG_ADD, CAPNG_PERMITTED, CAP_SETUID);
1419 capng_update(CAPNG_ADD, CAPNG_PERMITTED, CAP_SETGID);
1420 capng_update(CAPNG_ADD, CAPNG_PERMITTED, CAP_DAC_OVERRIDE);
1422 capng_update(CAPNG_ADD, CAPNG_EFFECTIVE, CAP_SETUID);
1423 capng_update(CAPNG_ADD, CAPNG_EFFECTIVE, CAP_SETGID);
1424 capng_update(CAPNG_ADD, CAPNG_EFFECTIVE, CAP_DAC_OVERRIDE);
1426 capng_apply(CAPNG_SELECT_BOTH);
1429 #endif /* HAVE_CAP_NG_H */
1431 if (getuid() == 0 || geteuid() == 0) {
1432 if (username || chroot_dir)
1433 droproot(username, chroot_dir);
1438 if (pcap_setfilter(pd, &fcode) < 0)
1439 error("%s", pcap_geterr(pd));
1442 /* Do not exceed the default PATH_MAX for files. */
1443 dumpinfo.CurrentFileName = (char *)malloc(PATH_MAX + 1);
1445 if (dumpinfo.CurrentFileName == NULL)
1446 error("malloc of dumpinfo.CurrentFileName");
1448 /* We do not need numbering for dumpfiles if Cflag isn't set. */
1450 MakeFilename(dumpinfo.CurrentFileName, WFileName, 0, WflagChars);
1452 MakeFilename(dumpinfo.CurrentFileName, WFileName, 0, 0);
1454 p = pcap_dump_open(pd, dumpinfo.CurrentFileName);
1455 #ifdef HAVE_CAP_NG_H
1456 /* Give up capabilities, clear Effective set */
1457 capng_clear(CAPNG_EFFECTIVE);
1460 error("%s", pcap_geterr(pd));
1461 if (Cflag != 0 || Gflag != 0) {
1462 callback = dump_packet_and_trunc;
1463 dumpinfo.WFileName = WFileName;
1466 pcap_userdata = (u_char *)&dumpinfo;
1468 callback = dump_packet;
1469 pcap_userdata = (u_char *)p;
1471 #ifdef HAVE_PCAP_DUMP_FLUSH
1476 type = pcap_datalink(pd);
1477 printinfo = get_print_info(type);
1478 callback = print_packet;
1479 pcap_userdata = (u_char *)&printinfo;
1482 #ifdef SIGNAL_REQ_INFO
1484 * We can't get statistics when reading from a file rather
1485 * than capturing from a device.
1487 if (RFileName == NULL)
1488 (void)setsignal(SIGNAL_REQ_INFO, requestinfo);
1491 if (vflag > 0 && WFileName) {
1493 * When capturing to a file, "-v" means tcpdump should,
1494 * every 10 secodns, "v"erbosely report the number of
1497 #ifdef USE_WIN32_MM_TIMER
1498 /* call verbose_stats_dump() each 1000 +/-100msec */
1499 timer_id = timeSetEvent(1000, 100, verbose_stats_dump, 0, TIME_PERIODIC);
1500 setvbuf(stderr, NULL, _IONBF, 0);
1501 #elif defined(HAVE_ALARM)
1502 (void)setsignal(SIGALRM, verbose_stats_dump);
1508 if (RFileName == NULL) {
1510 * Live capture (if -V was specified, we set RFileName
1511 * to a file from the -V file). Print a message to
1512 * the standard error on UN*X.
1514 if (!vflag && !WFileName) {
1515 (void)fprintf(stderr,
1516 "%s: verbose output suppressed, use -v or -vv for full protocol decode\n",
1519 (void)fprintf(stderr, "%s: ", program_name);
1520 dlt = pcap_datalink(pd);
1521 dlt_name = pcap_datalink_val_to_name(dlt);
1522 if (dlt_name == NULL) {
1523 (void)fprintf(stderr, "listening on %s, link-type %u, capture size %u bytes\n",
1524 device, dlt, snaplen);
1526 (void)fprintf(stderr, "listening on %s, link-type %s (%s), capture size %u bytes\n",
1528 pcap_datalink_val_to_description(dlt), snaplen);
1530 (void)fflush(stderr);
1534 status = pcap_loop(pd, cnt, callback, pcap_userdata);
1535 if (WFileName == NULL) {
1537 * We're printing packets. Flush the printed output,
1538 * so it doesn't get intermingled with error output.
1542 * We got interrupted, so perhaps we didn't
1543 * manage to finish a line we were printing.
1544 * Print an extra newline, just in case.
1548 (void)fflush(stdout);
1554 (void)fprintf(stderr, "%s: pcap_loop: %s\n",
1555 program_name, pcap_geterr(pd));
1557 if (RFileName == NULL) {
1559 * We're doing a live capture. Report the capture
1565 if (VFileName != NULL) {
1566 ret = get_next_file(VFile, VFileLine);
1568 RFileName = VFileLine;
1569 pd = pcap_open_offline(RFileName, ebuf);
1572 new_dlt = pcap_datalink(pd);
1573 if (WFileName && new_dlt != dlt)
1574 error("%s: new dlt does not match original", RFileName);
1575 printinfo = get_print_info(new_dlt);
1576 dlt_name = pcap_datalink_val_to_name(new_dlt);
1577 if (dlt_name == NULL) {
1578 fprintf(stderr, "reading from file %s, link-type %u\n",
1579 RFileName, new_dlt);
1582 "reading from file %s, link-type %s (%s)\n",
1583 RFileName, dlt_name,
1584 pcap_datalink_val_to_description(new_dlt));
1586 if (pcap_compile(pd, &fcode, cmdbuf, Oflag, netmask) < 0)
1587 error("%s", pcap_geterr(pd));
1588 if (pcap_setfilter(pd, &fcode) < 0)
1589 error("%s", pcap_geterr(pd));
1593 while (ret != NULL);
1596 exit(status == -1 ? 1 : 0);
1599 /* make a clean exit on interrupts */
1601 cleanup(int signo _U_)
1603 #ifdef USE_WIN32_MM_TIMER
1605 timeKillEvent(timer_id);
1607 #elif defined(HAVE_ALARM)
1611 #ifdef HAVE_PCAP_BREAKLOOP
1613 * We have "pcap_breakloop()"; use it, so that we do as little
1614 * as possible in the signal handler (it's probably not safe
1615 * to do anything with standard I/O streams in a signal handler -
1616 * the ANSI C standard doesn't say it is).
1621 * We don't have "pcap_breakloop()"; this isn't safe, but
1622 * it's the best we can do. Print the summary if we're
1623 * not reading from a savefile - i.e., if we're doing a
1624 * live capture - and exit.
1626 if (pd != NULL && pcap_file(pd) == NULL) {
1628 * We got interrupted, so perhaps we didn't
1629 * manage to finish a line we were printing.
1630 * Print an extra newline, just in case.
1633 (void)fflush(stdout);
1641 On windows, we do not use a fork, so we do not care less about
1642 waiting a child processes to die
1644 #if defined(HAVE_FORK) || defined(HAVE_VFORK)
1646 child_cleanup(int signo _U_)
1650 #endif /* HAVE_FORK && HAVE_VFORK */
1653 info(register int verbose)
1655 struct pcap_stat stat;
1658 * Older versions of libpcap didn't set ps_ifdrop on some
1659 * platforms; initialize it to 0 to handle that.
1662 if (pcap_stats(pd, &stat) < 0) {
1663 (void)fprintf(stderr, "pcap_stats: %s\n", pcap_geterr(pd));
1669 fprintf(stderr, "%s: ", program_name);
1671 (void)fprintf(stderr, "%u packet%s captured", packets_captured,
1672 PLURAL_SUFFIX(packets_captured));
1674 fputs(", ", stderr);
1677 (void)fprintf(stderr, "%u packet%s received by filter", stat.ps_recv,
1678 PLURAL_SUFFIX(stat.ps_recv));
1680 fputs(", ", stderr);
1683 (void)fprintf(stderr, "%u packet%s dropped by kernel", stat.ps_drop,
1684 PLURAL_SUFFIX(stat.ps_drop));
1685 if (stat.ps_ifdrop != 0) {
1687 fputs(", ", stderr);
1690 (void)fprintf(stderr, "%u packet%s dropped by interface\n",
1691 stat.ps_ifdrop, PLURAL_SUFFIX(stat.ps_ifdrop));
1697 #if defined(HAVE_FORK) || defined(HAVE_VFORK)
1699 compress_savefile(const char *filename)
1708 * Set to lowest priority so that this doesn't disturb the capture
1711 setpriority(PRIO_PROCESS, 0, NZERO - 1);
1713 setpriority(PRIO_PROCESS, 0, 19);
1715 if (execlp(zflag, zflag, filename, (char *)NULL) == -1)
1717 "compress_savefile:execlp(%s, %s): %s\n",
1727 #else /* HAVE_FORK && HAVE_VFORK */
1729 compress_savefile(const char *filename)
1732 "compress_savefile failed. Functionality not implemented under your system\n");
1734 #endif /* HAVE_FORK && HAVE_VFORK */
1737 dump_packet_and_trunc(u_char *user, const struct pcap_pkthdr *h, const u_char *sp)
1739 struct dump_info *dump_info;
1745 dump_info = (struct dump_info *)user;
1748 * XXX - this won't force the file to rotate on the specified time
1749 * boundary, but it will rotate on the first packet received after the
1750 * specified Gflag number of seconds. Note: if a Gflag time boundary
1751 * and a Cflag size boundary coincide, the time rotation will occur
1752 * first thereby cancelling the Cflag boundary (since the file should
1756 /* Check if it is time to rotate */
1759 /* Get the current time */
1760 if ((t = time(NULL)) == (time_t)-1) {
1761 error("dump_and_trunc_packet: can't get current_time: %s",
1762 pcap_strerror(errno));
1766 /* If the time is greater than the specified window, rotate */
1767 if (t - Gflag_time >= Gflag) {
1768 /* Update the Gflag_time */
1770 /* Update Gflag_count */
1773 * Close the current file and open a new one.
1775 pcap_dump_close(dump_info->p);
1778 * Compress the file we just closed, if the user asked for it
1781 compress_savefile(dump_info->CurrentFileName);
1784 * Check to see if we've exceeded the Wflag (when
1787 if (Cflag == 0 && Wflag > 0 && Gflag_count >= Wflag) {
1788 (void)fprintf(stderr, "Maximum file limit reached: %d\n",
1793 if (dump_info->CurrentFileName != NULL)
1794 free(dump_info->CurrentFileName);
1795 /* Allocate space for max filename + \0. */
1796 dump_info->CurrentFileName = (char *)malloc(PATH_MAX + 1);
1797 if (dump_info->CurrentFileName == NULL)
1798 error("dump_packet_and_trunc: malloc");
1800 * This is always the first file in the Cflag
1802 * We also don't need numbering if Cflag is not set.
1805 MakeFilename(dump_info->CurrentFileName, dump_info->WFileName, 0,
1808 MakeFilename(dump_info->CurrentFileName, dump_info->WFileName, 0, 0);
1810 #ifdef HAVE_CAP_NG_H
1811 capng_update(CAPNG_ADD, CAPNG_EFFECTIVE, CAP_DAC_OVERRIDE);
1812 capng_apply(CAPNG_EFFECTIVE);
1813 #endif /* HAVE_CAP_NG_H */
1814 dump_info->p = pcap_dump_open(dump_info->pd, dump_info->CurrentFileName);
1815 #ifdef HAVE_CAP_NG_H
1816 capng_update(CAPNG_DROP, CAPNG_EFFECTIVE, CAP_DAC_OVERRIDE);
1817 capng_apply(CAPNG_EFFECTIVE);
1818 #endif /* HAVE_CAP_NG_H */
1819 if (dump_info->p == NULL)
1820 error("%s", pcap_geterr(pd));
1825 * XXX - this won't prevent capture files from getting
1826 * larger than Cflag - the last packet written to the
1827 * file could put it over Cflag.
1829 if (Cflag != 0 && pcap_dump_ftell(dump_info->p) > Cflag) {
1831 * Close the current file and open a new one.
1833 pcap_dump_close(dump_info->p);
1836 * Compress the file we just closed, if the user asked for it
1839 compress_savefile(dump_info->CurrentFileName);
1843 if (Cflag_count >= Wflag)
1846 if (dump_info->CurrentFileName != NULL)
1847 free(dump_info->CurrentFileName);
1848 dump_info->CurrentFileName = (char *)malloc(PATH_MAX + 1);
1849 if (dump_info->CurrentFileName == NULL)
1850 error("dump_packet_and_trunc: malloc");
1851 MakeFilename(dump_info->CurrentFileName, dump_info->WFileName, Cflag_count, WflagChars);
1852 dump_info->p = pcap_dump_open(dump_info->pd, dump_info->CurrentFileName);
1853 if (dump_info->p == NULL)
1854 error("%s", pcap_geterr(pd));
1857 pcap_dump((u_char *)dump_info->p, h, sp);
1858 #ifdef HAVE_PCAP_DUMP_FLUSH
1860 pcap_dump_flush(dump_info->p);
1869 dump_packet(u_char *user, const struct pcap_pkthdr *h, const u_char *sp)
1875 pcap_dump(user, h, sp);
1876 #ifdef HAVE_PCAP_DUMP_FLUSH
1878 pcap_dump_flush((pcap_dumper_t *)user);
1887 print_packet(u_char *user, const struct pcap_pkthdr *h, const u_char *sp)
1889 struct print_info *print_info;
1897 print_info = (struct print_info *)user;
1900 * Some printers want to check that they're not walking off the
1901 * end of the packet.
1902 * Rather than pass it all the way down, we set this global.
1904 snapend = sp + h->caplen;
1906 if(print_info->ndo_type) {
1907 hdrlen = (*print_info->p.ndo_printer)(print_info->ndo, h, sp);
1909 hdrlen = (*print_info->p.printer)(h, sp);
1914 * Print the raw packet data in hex and ASCII.
1918 * Include the link-layer header.
1920 hex_and_ascii_print("\n\t", sp, h->caplen);
1923 * Don't include the link-layer header - and if
1924 * we have nothing past the link-layer header,
1927 if (h->caplen > hdrlen)
1928 hex_and_ascii_print("\n\t", sp + hdrlen,
1929 h->caplen - hdrlen);
1933 * Print the raw packet data in hex.
1937 * Include the link-layer header.
1939 hex_print("\n\t", sp, h->caplen);
1942 * Don't include the link-layer header - and if
1943 * we have nothing past the link-layer header,
1946 if (h->caplen > hdrlen)
1947 hex_print("\n\t", sp + hdrlen,
1948 h->caplen - hdrlen);
1952 * Print the raw packet data in ASCII.
1956 * Include the link-layer header.
1958 ascii_print(sp, h->caplen);
1961 * Don't include the link-layer header - and if
1962 * we have nothing past the link-layer header,
1965 if (h->caplen > hdrlen)
1966 ascii_print(sp + hdrlen, h->caplen - hdrlen);
1979 * XXX - there should really be libpcap calls to get the version
1980 * number as a string (the string would be generated from #defines
1981 * at run time, so that it's not generated from string constants
1982 * in the library, as, on many UNIX systems, those constants would
1983 * be statically linked into the application executable image, and
1984 * would thus reflect the version of libpcap on the system on
1985 * which the application was *linked*, not the system on which it's
1988 * That routine should be documented, unlike the "version[]"
1989 * string, so that UNIX vendors providing their own libpcaps
1990 * don't omit it (as a couple of vendors have...).
1992 * Packet.dll should perhaps also export a routine to return the
1993 * version number of the Packet.dll code, to supply the
1994 * "Wpcap_version" information on Windows.
1996 char WDversion[]="current-cvs.tcpdump.org";
1997 #if !defined(HAVE_GENERATED_VERSION)
1998 char version[]="current-cvs.tcpdump.org";
2000 char pcap_version[]="current-cvs.tcpdump.org";
2001 char Wpcap_version[]="3.1";
2005 * By default, print the specified data out in hex and ASCII.
2008 ndo_default_print(netdissect_options *ndo _U_, const u_char *bp, u_int length)
2010 hex_and_ascii_print("\n\t", bp, length); /* pass on lf and identation string */
2014 default_print(const u_char *bp, u_int length)
2016 ndo_default_print(gndo, bp, length);
2019 #ifdef SIGNAL_REQ_INFO
2020 RETSIGTYPE requestinfo(int signo _U_)
2030 * Called once each second in verbose mode while dumping to file
2032 #ifdef USE_WIN32_MM_TIMER
2033 void CALLBACK verbose_stats_dump (UINT timer_id _U_, UINT msg _U_, DWORD_PTR arg _U_,
2034 DWORD_PTR dw1 _U_, DWORD_PTR dw2 _U_)
2036 struct pcap_stat stat;
2038 if (infodelay == 0 && pcap_stats(pd, &stat) >= 0)
2039 fprintf(stderr, "Got %u\r", packets_captured);
2041 #elif defined(HAVE_ALARM)
2042 static void verbose_stats_dump(int sig _U_)
2044 struct pcap_stat stat;
2046 if (infodelay == 0 && pcap_stats(pd, &stat) >= 0)
2047 fprintf(stderr, "Got %u\r", packets_captured);
2055 extern char version[];
2056 #ifndef HAVE_PCAP_LIB_VERSION
2057 #if defined(WIN32) || defined(HAVE_PCAP_VERSION)
2058 extern char pcap_version[];
2059 #else /* defined(WIN32) || defined(HAVE_PCAP_VERSION) */
2060 static char pcap_version[] = "unknown";
2061 #endif /* defined(WIN32) || defined(HAVE_PCAP_VERSION) */
2062 #endif /* HAVE_PCAP_LIB_VERSION */
2064 #ifdef HAVE_PCAP_LIB_VERSION
2066 (void)fprintf(stderr, "%s version %s, based on tcpdump version %s\n", program_name, WDversion, version);
2068 (void)fprintf(stderr, "%s version %s\n", program_name, version);
2070 (void)fprintf(stderr, "%s\n",pcap_lib_version());
2071 #else /* HAVE_PCAP_LIB_VERSION */
2073 (void)fprintf(stderr, "%s version %s, based on tcpdump version %s\n", program_name, WDversion, version);
2074 (void)fprintf(stderr, "WinPcap version %s, based on libpcap version %s\n",Wpcap_version, pcap_version);
2076 (void)fprintf(stderr, "%s version %s\n", program_name, version);
2077 (void)fprintf(stderr, "libpcap version %s\n", pcap_version);
2079 #endif /* HAVE_PCAP_LIB_VERSION */
2080 (void)fprintf(stderr,
2081 "Usage: %s [-aAbd" D_FLAG "efhH" I_FLAG J_FLAG "KlLnNOpqRStu" U_FLAG "vxX]" B_FLAG_USAGE " [ -c count ]\n", program_name);
2082 (void)fprintf(stderr,
2083 "\t\t[ -C file_size ] [ -E algo:secret ] [ -F file ] [ -G seconds ]\n");
2084 (void)fprintf(stderr,
2085 "\t\t[ -i interface ]" j_FLAG_USAGE " [ -M secret ]\n");
2086 (void)fprintf(stderr,
2087 "\t\t[ -r file ] [ -s snaplen ] [ -T type ] [ -V file ] [ -w file ]\n");
2088 (void)fprintf(stderr,
2089 "\t\t[ -W filecount ] [ -y datalinktype ] [ -z command ]\n");
2090 (void)fprintf(stderr,
2091 "\t\t[ -Z user ] [ expression ]\n");
2099 ndo_error(netdissect_options *ndo _U_, const char *fmt, ...)
2103 (void)fprintf(stderr, "%s: ", program_name);
2105 (void)vfprintf(stderr, fmt, ap);
2109 if (fmt[-1] != '\n')
2110 (void)fputc('\n', stderr);
2118 ndo_warning(netdissect_options *ndo _U_, const char *fmt, ...)
2122 (void)fprintf(stderr, "%s: WARNING: ", program_name);
2124 (void)vfprintf(stderr, fmt, ap);
2128 if (fmt[-1] != '\n')
2129 (void)fputc('\n', stderr);