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);
72 #include <sys/capsicum.h>
73 #include <sys/ioccom.h>
74 #include <sys/types.h>
75 #include <sys/sysctl.h>
79 #endif /* __FreeBSD__ */
82 #include <sys/resource.h>
88 /* capabilities convinience library */
91 #endif /* HAVE_CAP_NG_H */
93 #include "netdissect.h"
94 #include "interface.h"
95 #include "addrtoname.h"
97 #include "setsignal.h"
98 #include "gmt2local.h"
99 #include "pcap-missing.h"
102 #define PATH_MAX 1024
106 #define SIGNAL_REQ_INFO SIGINFO
108 #define SIGNAL_REQ_INFO SIGUSR1
111 netdissect_options Gndo;
112 netdissect_options *gndo = &Gndo;
114 static int dflag; /* print filter code */
115 static int Lflag; /* list available data link types and exit */
116 #ifdef HAVE_PCAP_SET_TSTAMP_TYPE
117 static int Jflag; /* list available time stamp types */
119 static char *zflag = NULL; /* compress each savefile using a specified command (like gzip or bzip2) */
121 static int infodelay;
122 static int infoprint;
126 int32_t thiszone; /* seconds offset from gmt to local time */
129 static RETSIGTYPE cleanup(int);
130 static RETSIGTYPE child_cleanup(int);
131 static void usage(void) __attribute__((noreturn));
132 static void show_dlts_and_exit(const char *device, pcap_t *pd) __attribute__((noreturn));
134 static void print_packet(u_char *, const struct pcap_pkthdr *, const u_char *);
135 static void ndo_default_print(netdissect_options *, const u_char *, u_int);
136 static void dump_packet_and_trunc(u_char *, const struct pcap_pkthdr *, const u_char *);
137 static void dump_packet(u_char *, const struct pcap_pkthdr *, const u_char *);
138 static void droproot(const char *, const char *);
139 static void ndo_error(netdissect_options *ndo, const char *fmt, ...)
140 __attribute__ ((noreturn, format (printf, 2, 3)));
141 static void ndo_warning(netdissect_options *ndo, const char *fmt, ...);
143 #ifdef SIGNAL_REQ_INFO
144 RETSIGTYPE requestinfo(int);
147 #if defined(USE_WIN32_MM_TIMER)
148 #include <MMsystem.h>
149 static UINT timer_id;
150 static void CALLBACK verbose_stats_dump(UINT, UINT, DWORD_PTR, DWORD_PTR, DWORD_PTR);
151 #elif defined(HAVE_ALARM)
152 static void verbose_stats_dump(int sig);
155 static void info(int);
156 static u_int packets_captured;
170 static struct printer printers[] = {
171 { arcnet_if_print, DLT_ARCNET },
172 #ifdef DLT_ARCNET_LINUX
173 { arcnet_linux_if_print, DLT_ARCNET_LINUX },
175 { token_if_print, DLT_IEEE802 },
177 { lane_if_print, DLT_LANE8023 },
180 { cip_if_print, DLT_CIP },
183 { cip_if_print, DLT_ATM_CLIP },
185 { sl_if_print, DLT_SLIP },
186 #ifdef DLT_SLIP_BSDOS
187 { sl_bsdos_if_print, DLT_SLIP_BSDOS },
189 { ppp_if_print, DLT_PPP },
190 #ifdef DLT_PPP_WITHDIRECTION
191 { ppp_if_print, DLT_PPP_WITHDIRECTION },
194 { ppp_bsdos_if_print, DLT_PPP_BSDOS },
196 { fddi_if_print, DLT_FDDI },
197 { null_if_print, DLT_NULL },
199 { null_if_print, DLT_LOOP },
201 { raw_if_print, DLT_RAW },
202 { atm_if_print, DLT_ATM_RFC1483 },
204 { chdlc_if_print, DLT_C_HDLC },
207 { chdlc_if_print, DLT_HDLC },
209 #ifdef DLT_PPP_SERIAL
210 { ppp_hdlc_if_print, DLT_PPP_SERIAL },
213 { pppoe_if_print, DLT_PPP_ETHER },
216 { sll_if_print, DLT_LINUX_SLL },
218 #ifdef DLT_IEEE802_11
219 { ieee802_11_if_print, DLT_IEEE802_11},
222 { ltalk_if_print, DLT_LTALK },
224 #if defined(DLT_PFLOG) && defined(HAVE_NET_PFVAR_H)
225 { pflog_if_print, DLT_PFLOG },
228 { fr_if_print, DLT_FR },
231 { fr_if_print, DLT_FRELAY },
234 { sunatm_if_print, DLT_SUNATM },
236 #ifdef DLT_IP_OVER_FC
237 { ipfc_if_print, DLT_IP_OVER_FC },
239 #ifdef DLT_PRISM_HEADER
240 { prism_if_print, DLT_PRISM_HEADER },
242 #ifdef DLT_IEEE802_11_RADIO
243 { ieee802_11_radio_if_print, DLT_IEEE802_11_RADIO },
246 { enc_if_print, DLT_ENC },
248 #ifdef DLT_SYMANTEC_FIREWALL
249 { symantec_if_print, DLT_SYMANTEC_FIREWALL },
251 #ifdef DLT_APPLE_IP_OVER_IEEE1394
252 { ap1394_if_print, DLT_APPLE_IP_OVER_IEEE1394 },
254 #ifdef DLT_IEEE802_11_RADIO_AVS
255 { ieee802_11_radio_avs_if_print, DLT_IEEE802_11_RADIO_AVS },
257 #ifdef DLT_JUNIPER_ATM1
258 { juniper_atm1_print, DLT_JUNIPER_ATM1 },
260 #ifdef DLT_JUNIPER_ATM2
261 { juniper_atm2_print, DLT_JUNIPER_ATM2 },
263 #ifdef DLT_JUNIPER_MFR
264 { juniper_mfr_print, DLT_JUNIPER_MFR },
266 #ifdef DLT_JUNIPER_MLFR
267 { juniper_mlfr_print, DLT_JUNIPER_MLFR },
269 #ifdef DLT_JUNIPER_MLPPP
270 { juniper_mlppp_print, DLT_JUNIPER_MLPPP },
272 #ifdef DLT_JUNIPER_PPPOE
273 { juniper_pppoe_print, DLT_JUNIPER_PPPOE },
275 #ifdef DLT_JUNIPER_PPPOE_ATM
276 { juniper_pppoe_atm_print, DLT_JUNIPER_PPPOE_ATM },
278 #ifdef DLT_JUNIPER_GGSN
279 { juniper_ggsn_print, DLT_JUNIPER_GGSN },
281 #ifdef DLT_JUNIPER_ES
282 { juniper_es_print, DLT_JUNIPER_ES },
284 #ifdef DLT_JUNIPER_MONITOR
285 { juniper_monitor_print, DLT_JUNIPER_MONITOR },
287 #ifdef DLT_JUNIPER_SERVICES
288 { juniper_services_print, DLT_JUNIPER_SERVICES },
290 #ifdef DLT_JUNIPER_ETHER
291 { juniper_ether_print, DLT_JUNIPER_ETHER },
293 #ifdef DLT_JUNIPER_PPP
294 { juniper_ppp_print, DLT_JUNIPER_PPP },
296 #ifdef DLT_JUNIPER_FRELAY
297 { juniper_frelay_print, DLT_JUNIPER_FRELAY },
299 #ifdef DLT_JUNIPER_CHDLC
300 { juniper_chdlc_print, DLT_JUNIPER_CHDLC },
303 { mfr_if_print, DLT_MFR },
305 #if defined(DLT_BLUETOOTH_HCI_H4_WITH_PHDR) && defined(HAVE_PCAP_BLUETOOTH_H)
306 { bt_if_print, DLT_BLUETOOTH_HCI_H4_WITH_PHDR},
308 #ifdef HAVE_PCAP_USB_H
310 { usb_linux_48_byte_print, DLT_USB_LINUX},
311 #endif /* DLT_USB_LINUX */
312 #ifdef DLT_USB_LINUX_MMAPPED
313 { usb_linux_64_byte_print, DLT_USB_LINUX_MMAPPED},
314 #endif /* DLT_USB_LINUX_MMAPPED */
315 #endif /* HAVE_PCAP_USB_H */
317 { raw_if_print, DLT_IPV4 },
320 { raw_if_print, DLT_IPV6 },
325 static struct ndo_printer ndo_printers[] = {
326 { ether_if_print, DLT_EN10MB },
328 { ipnet_if_print, DLT_IPNET },
330 #ifdef DLT_IEEE802_15_4
331 { ieee802_15_4_if_print, DLT_IEEE802_15_4 },
333 #ifdef DLT_IEEE802_15_4_NOFCS
334 { ieee802_15_4_if_print, DLT_IEEE802_15_4_NOFCS },
337 { ppi_if_print, DLT_PPI },
339 #ifdef DLT_NETANALYZER
340 { netanalyzer_if_print, DLT_NETANALYZER },
342 #ifdef DLT_NETANALYZER_TRANSPARENT
343 { netanalyzer_transparent_if_print, DLT_NETANALYZER_TRANSPARENT },
349 lookup_printer(int type)
353 for (p = printers; p->f; ++p)
362 lookup_ndo_printer(int type)
364 struct ndo_printer *p;
366 for (p = ndo_printers; p->f; ++p)
376 static int supports_monitor_mode;
383 netdissect_options *ndo;
386 if_ndo_printer ndo_printer;
393 char *CurrentFileName;
401 #ifdef HAVE_PCAP_SET_TSTAMP_TYPE
403 show_tstamp_types_and_exit(const char *device, pcap_t *pd)
406 int *tstamp_types = 0;
407 const char *tstamp_type_name;
410 n_tstamp_types = pcap_list_tstamp_types(pd, &tstamp_types);
411 if (n_tstamp_types < 0)
412 error("%s", pcap_geterr(pd));
414 if (n_tstamp_types == 0) {
415 fprintf(stderr, "Time stamp type cannot be set for %s\n",
419 fprintf(stderr, "Time stamp types for %s (use option -j to set):\n",
421 for (i = 0; i < n_tstamp_types; i++) {
422 tstamp_type_name = pcap_tstamp_type_val_to_name(tstamp_types[i]);
423 if (tstamp_type_name != NULL) {
424 (void) fprintf(stderr, " %s (%s)\n", tstamp_type_name,
425 pcap_tstamp_type_val_to_description(tstamp_types[i]));
427 (void) fprintf(stderr, " %d\n", tstamp_types[i]);
430 pcap_free_tstamp_types(tstamp_types);
436 show_dlts_and_exit(const char *device, pcap_t *pd)
440 const char *dlt_name;
442 n_dlts = pcap_list_datalinks(pd, &dlts);
444 error("%s", pcap_geterr(pd));
445 else if (n_dlts == 0 || !dlts)
446 error("No data link types.");
449 * If the interface is known to support monitor mode, indicate
450 * whether these are the data link types available when not in
451 * monitor mode, if -I wasn't specified, or when in monitor mode,
452 * when -I was specified (the link-layer types available in
453 * monitor mode might be different from the ones available when
454 * not in monitor mode).
456 if (supports_monitor_mode)
457 (void) fprintf(stderr, "Data link types for %s %s (use option -y to set):\n",
459 Iflag ? "when in monitor mode" : "when not in monitor mode");
461 (void) fprintf(stderr, "Data link types for %s (use option -y to set):\n",
464 while (--n_dlts >= 0) {
465 dlt_name = pcap_datalink_val_to_name(dlts[n_dlts]);
466 if (dlt_name != NULL) {
467 (void) fprintf(stderr, " %s (%s)", dlt_name,
468 pcap_datalink_val_to_description(dlts[n_dlts]));
471 * OK, does tcpdump handle that type?
473 if (lookup_printer(dlts[n_dlts]) == NULL
474 && lookup_ndo_printer(dlts[n_dlts]) == NULL)
475 (void) fprintf(stderr, " (printing not supported)");
476 fprintf(stderr, "\n");
478 (void) fprintf(stderr, " DLT %d (printing not supported)\n",
482 #ifdef HAVE_PCAP_FREE_DATALINKS
483 pcap_free_datalinks(dlts);
489 * Set up flags that might or might not be supported depending on the
490 * version of libpcap we're using.
492 #if defined(HAVE_PCAP_CREATE) || defined(WIN32)
494 #define B_FLAG_USAGE " [ -B size ]"
495 #else /* defined(HAVE_PCAP_CREATE) || defined(WIN32) */
498 #endif /* defined(HAVE_PCAP_CREATE) || defined(WIN32) */
500 #ifdef HAVE_PCAP_CREATE
502 #else /* HAVE_PCAP_CREATE */
504 #endif /* HAVE_PCAP_CREATE */
506 #ifdef HAVE_PCAP_SET_TSTAMP_TYPE
508 #define j_FLAG_USAGE " [ -j tstamptype ]"
510 #else /* PCAP_ERROR_TSTAMP_TYPE_NOTSUP */
514 #endif /* PCAP_ERROR_TSTAMP_TYPE_NOTSUP */
516 #ifdef HAVE_PCAP_FINDALLDEVS
517 #ifndef HAVE_PCAP_IF_T
518 #undef HAVE_PCAP_FINDALLDEVS
522 #ifdef HAVE_PCAP_FINDALLDEVS
528 #ifdef HAVE_PCAP_DUMP_FLUSH
535 /* Drop root privileges and chroot if necessary */
537 droproot(const char *username, const char *chroot_dir)
539 struct passwd *pw = NULL;
541 if (chroot_dir && !username) {
542 fprintf(stderr, "tcpdump: Chroot without dropping root is insecure\n");
546 pw = getpwnam(username);
549 if (chroot(chroot_dir) != 0 || chdir ("/") != 0) {
550 fprintf(stderr, "tcpdump: Couldn't chroot/chdir to '%.64s': %s\n",
551 chroot_dir, pcap_strerror(errno));
556 int ret = capng_change_id(pw->pw_uid, pw->pw_gid, CAPNG_NO_FLAG);
558 printf("error : ret %d\n", ret);
560 /* We don't need CAP_SETUID and CAP_SETGID */
561 capng_update(CAPNG_DROP, CAPNG_EFFECTIVE, CAP_SETUID);
562 capng_update(CAPNG_DROP, CAPNG_EFFECTIVE, CAP_SETUID);
563 capng_update(CAPNG_DROP, CAPNG_PERMITTED, CAP_SETUID);
564 capng_update(CAPNG_DROP, CAPNG_PERMITTED, CAP_SETUID);
565 capng_apply(CAPNG_SELECT_BOTH);
568 if (initgroups(pw->pw_name, pw->pw_gid) != 0 ||
569 setgid(pw->pw_gid) != 0 || setuid(pw->pw_uid) != 0) {
570 fprintf(stderr, "tcpdump: Couldn't change to '%.32s' uid=%lu gid=%lu: %s\n",
572 (unsigned long)pw->pw_uid,
573 (unsigned long)pw->pw_gid,
574 pcap_strerror(errno));
577 #endif /* HAVE_CAP_NG_H */
580 fprintf(stderr, "tcpdump: Couldn't find user '%.32s'\n",
603 MakeFilename(char *buffer, char *orig_name, int cnt, int max_chars)
605 char *filename = malloc(PATH_MAX + 1);
606 if (filename == NULL)
607 error("Makefilename: malloc");
609 /* Process with strftime if Gflag is set. */
613 /* Convert Gflag_time to a usable format */
614 if ((local_tm = localtime(&Gflag_time)) == NULL) {
615 error("MakeTimedFilename: localtime");
618 /* There's no good way to detect an error in strftime since a return
619 * value of 0 isn't necessarily failure.
621 strftime(filename, PATH_MAX, orig_name, local_tm);
623 strncpy(filename, orig_name, PATH_MAX);
626 if (cnt == 0 && max_chars == 0)
627 strncpy(buffer, filename, PATH_MAX + 1);
629 if (snprintf(buffer, PATH_MAX + 1, "%s%0*d", filename, max_chars, cnt) > PATH_MAX)
630 /* Report an error if the filename is too large */
631 error("too many output files or filename is too long (> %d)", PATH_MAX);
635 static int tcpdump_printf(netdissect_options *ndo _U_,
636 const char *fmt, ...)
643 ret=vfprintf(stdout, fmt, args);
649 static struct print_info
650 get_print_info(int type)
652 struct print_info printinfo;
654 printinfo.ndo_type = 1;
655 printinfo.ndo = gndo;
656 printinfo.p.ndo_printer = lookup_ndo_printer(type);
657 if (printinfo.p.ndo_printer == NULL) {
658 printinfo.p.printer = lookup_printer(type);
659 printinfo.ndo_type = 0;
660 if (printinfo.p.printer == NULL) {
661 gndo->ndo_dltname = pcap_datalink_val_to_name(type);
662 if (gndo->ndo_dltname != NULL)
663 error("packet printing is not supported for link type %s: use -w",
666 error("packet printing is not supported for link type %d: use -w", type);
673 get_next_file(FILE *VFile, char *ptr)
677 ret = fgets(ptr, PATH_MAX, VFile);
681 if (ptr[strlen(ptr) - 1] == '\n')
682 ptr[strlen(ptr) - 1] = '\0';
689 * Ensure that, on a dump file's descriptor, we have all the rights
690 * necessary to make the standard I/O library work with an fdopen()ed
691 * FILE * from that descriptor.
693 * A long time ago, in a galaxy far far away, AT&T decided that, instead
694 * of providing separate APIs for getting and setting the FD_ flags on a
695 * descriptor, getting and setting the O_ flags on a descriptor, and
696 * locking files, they'd throw them all into a kitchen-sink fcntl() call
697 * along the lines of ioctl(), the fact that ioctl() operations are
698 * largely specific to particular character devices but fcntl() operations
699 * are either generic to all descriptors or generic to all descriptors for
700 * regular files nonwithstanding.
702 * The Capsicum people decided that fine-grained control of descriptor
703 * operations was required, so that you need to grant permission for
704 * reading, writing, seeking, and fcntl-ing. The latter, courtesy of
705 * AT&T's decision, means that "fcntl-ing" isn't a thing, but a motley
706 * collection of things, so there are *individual* fcntls for which
707 * permission needs to be granted.
709 * The FreeBSD standard I/O people implemented some optimizations that
710 * requires that the standard I/O routines be able to determine whether
711 * the descriptor for the FILE * is open append-only or not; as that
712 * descriptor could have come from an open() rather than an fopen(),
713 * that requires that it be able to do an F_GETFL fcntl() to read
716 * Tcpdump uses ftell() to determine how much data has been written
717 * to a file in order to, when used with -C, determine when it's time
718 * to rotate capture files. ftell() therefore needs to do an lseek()
719 * to find out the file offset and must, thanks to the aforementioned
720 * optimization, also know whether the descriptor is open append-only
723 * The net result of all the above is that we need to grant CAP_SEEK,
724 * CAP_WRITE, and CAP_FCNTL with the CAP_FCNTL_GETFL subcapability.
726 * Perhaps this is the universe's way of saying that either
728 * 1) there needs to be an fopenat() call and a pcap_dump_openat() call
729 * using it, so that Capsicum-capable tcpdump wouldn't need to do
734 * 2) there needs to be a cap_fdopen() call in the FreeBSD standard
735 * I/O library that knows what rights are needed by the standard
736 * I/O library, based on the open mode, and assigns them, perhaps
737 * with an additional argument indicating, for example, whether
738 * seeking should be allowed, so that tcpdump doesn't need to know
739 * what the standard I/O library happens to require this week.
742 set_dumper_capsicum_rights(pcap_dumper_t *p)
744 int fd = fileno(pcap_dump_file(p));
747 cap_rights_init(&rights, CAP_SEEK, CAP_WRITE, CAP_FCNTL);
748 if (cap_rights_limit(fd, &rights) < 0 && errno != ENOSYS) {
749 error("unable to limit dump descriptor");
751 if (cap_fcntls_limit(fd, CAP_FCNTL_GETFL) < 0 && errno != ENOSYS) {
752 error("unable to limit dump descriptor fcntls");
758 main(int argc, char **argv)
760 register int cnt, op, i;
761 bpf_u_int32 localnet, netmask;
762 register char *cp, *infile, *cmdbuf, *device, *RFileName, *VFileName, *WFileName;
763 pcap_handler callback;
767 const char *dlt_name;
768 struct bpf_program fcode;
770 RETSIGTYPE (*oldhandler)(int);
772 struct print_info printinfo;
773 struct dump_info dumpinfo;
774 u_char *pcap_userdata;
775 char ebuf[PCAP_ERRBUF_SIZE];
776 char VFileLine[PATH_MAX + 1];
777 char *username = NULL;
778 char *chroot_dir = NULL;
781 #ifdef HAVE_PCAP_FINDALLDEVS
782 pcap_if_t *devpointer;
790 #endif /* __FreeBSD__ */
793 if(wsockinit() != 0) return 1;
796 jflag=-1; /* not set */
800 gndo->ndo_default_print=ndo_default_print;
801 gndo->ndo_printf=tcpdump_printf;
802 gndo->ndo_error=ndo_error;
803 gndo->ndo_warning=ndo_warning;
804 gndo->ndo_snaplen = DEFAULT_SNAPLEN;
814 if ((cp = strrchr(argv[0], '/')) != NULL)
815 program_name = cp + 1;
817 program_name = argv[0];
819 if (abort_on_misalignment(ebuf, sizeof(ebuf)) < 0)
827 (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)
831 /* compatibility for old -a */
842 #if defined(HAVE_PCAP_CREATE) || defined(WIN32)
844 Bflag = atoi(optarg)*1024;
846 error("invalid packet buffer size %s", optarg);
848 #endif /* defined(HAVE_PCAP_CREATE) || defined(WIN32) */
853 error("invalid packet count %s", optarg);
857 Cflag = atoi(optarg) * 1000000;
859 error("invalid file size %s", optarg);
866 #ifdef HAVE_PCAP_FINDALLDEVS
868 if (pcap_findalldevs(&devpointer, ebuf) < 0)
871 for (i = 0; devpointer != 0; i++) {
872 printf("%d.%s", i+1, devpointer->name);
873 if (devpointer->description != NULL)
874 printf(" (%s)", devpointer->description);
876 devpointer = devpointer->next;
880 #endif /* HAVE_PCAP_FINDALLDEVS */
891 #ifndef HAVE_LIBCRYPTO
892 warning("crypto code not compiled in");
894 gndo->ndo_espsecret = optarg;
906 Gflag = atoi(optarg);
908 error("invalid number of seconds %s", optarg);
910 /* We will create one file initially. */
913 /* Grab the current time for rotation use. */
914 if ((Gflag_time = time(NULL)) == (time_t)-1) {
915 error("main: can't get current time: %s",
916 pcap_strerror(errno));
929 if (optarg[0] == '0' && optarg[1] == 0)
930 error("Invalid adapter index");
932 #ifdef HAVE_PCAP_FINDALLDEVS
934 * If the argument is a number, treat it as
935 * an index into the list of adapters, as
936 * printed by "tcpdump -D".
938 * This should be OK on UNIX systems, as interfaces
939 * shouldn't have names that begin with digits.
940 * It can be useful on Windows, where more than
941 * one interface can have the same name.
943 devnum = strtol(optarg, &end, 10);
944 if (optarg != end && *end == '\0') {
946 error("Invalid adapter index");
948 if (pcap_findalldevs(&devpointer, ebuf) < 0)
952 * Look for the devnum-th entry
953 * in the list of devices
957 i < devnum-1 && devpointer != NULL;
958 i++, devpointer = devpointer->next)
960 if (devpointer == NULL)
961 error("Invalid adapter index");
963 device = devpointer->name;
966 #endif /* HAVE_PCAP_FINDALLDEVS */
970 #ifdef HAVE_PCAP_CREATE
974 #endif /* HAVE_PCAP_CREATE */
976 #ifdef HAVE_PCAP_SET_TSTAMP_TYPE
978 jflag = pcap_tstamp_type_name_to_val(optarg);
980 error("invalid time stamp type %s", optarg);
991 * _IOLBF is the same as _IOFBF in Microsoft's C
992 * libraries; the only alternative they offer
995 * XXX - this should really be checking for MSVC++,
996 * not WIN32, if, for example, MinGW has its own
997 * C library that is more UNIX-compatible.
999 setvbuf(stdout, NULL, _IONBF, 0);
1001 #ifdef HAVE_SETLINEBUF
1004 setvbuf(stdout, NULL, _IOLBF, 0);
1015 if (smiLoadModule(optarg) == 0) {
1016 error("could not load MIB module %s", optarg);
1020 (void)fprintf(stderr, "%s: ignoring option `-m %s' ",
1021 program_name, optarg);
1022 (void)fprintf(stderr, "(no libsmi support)\n");
1027 /* TCP-MD5 shared secret */
1028 #ifndef HAVE_LIBCRYPTO
1029 warning("crypto code not compiled in");
1052 ++suppress_default_print;
1064 snaplen = strtol(optarg, &end, 0);
1065 if (optarg == end || *end != '\0'
1066 || snaplen < 0 || snaplen > MAXIMUM_SNAPLEN)
1067 error("invalid snaplen %s", optarg);
1068 else if (snaplen == 0)
1069 snaplen = MAXIMUM_SNAPLEN;
1081 if (strcasecmp(optarg, "vat") == 0)
1082 packettype = PT_VAT;
1083 else if (strcasecmp(optarg, "wb") == 0)
1085 else if (strcasecmp(optarg, "rpc") == 0)
1086 packettype = PT_RPC;
1087 else if (strcasecmp(optarg, "rtp") == 0)
1088 packettype = PT_RTP;
1089 else if (strcasecmp(optarg, "rtcp") == 0)
1090 packettype = PT_RTCP;
1091 else if (strcasecmp(optarg, "snmp") == 0)
1092 packettype = PT_SNMP;
1093 else if (strcasecmp(optarg, "cnfp") == 0)
1094 packettype = PT_CNFP;
1095 else if (strcasecmp(optarg, "tftp") == 0)
1096 packettype = PT_TFTP;
1097 else if (strcasecmp(optarg, "aodv") == 0)
1098 packettype = PT_AODV;
1099 else if (strcasecmp(optarg, "carp") == 0)
1100 packettype = PT_CARP;
1101 else if (strcasecmp(optarg, "radius") == 0)
1102 packettype = PT_RADIUS;
1103 else if (strcasecmp(optarg, "zmtp1") == 0)
1104 packettype = PT_ZMTP1;
1105 else if (strcasecmp(optarg, "vxlan") == 0)
1106 packettype = PT_VXLAN;
1108 error("unknown packet type `%s'", optarg);
1115 #ifdef HAVE_PCAP_DUMP_FLUSH
1134 Wflag = atoi(optarg);
1136 error("invalid number of output files %s", optarg);
1137 WflagChars = getWflagChars(Wflag);
1142 ++suppress_default_print;
1147 ++suppress_default_print;
1151 gndo->ndo_dltname = optarg;
1153 pcap_datalink_name_to_val(gndo->ndo_dltname);
1154 if (gndo->ndo_dlt < 0)
1155 error("invalid data link type %s", gndo->ndo_dltname);
1158 #if defined(HAVE_PCAP_DEBUG) || defined(HAVE_YYDEBUG)
1161 /* Undocumented flag */
1162 #ifdef HAVE_PCAP_DEBUG
1163 extern int pcap_debug;
1174 zflag = strdup(optarg);
1183 username = strdup(optarg);
1198 case 0: /* Default */
1199 case 4: /* Default + Date*/
1200 thiszone = gmt2local(0);
1203 case 1: /* No time stamp */
1204 case 2: /* Unix timeval style */
1205 case 3: /* Microseconds since previous packet */
1206 case 5: /* Microseconds since first packet */
1209 default: /* Not supported */
1210 error("only -t, -tt, -ttt, -tttt and -ttttt are supported");
1214 if (fflag != 0 && (VFileName != NULL || RFileName != NULL))
1215 error("-f can not be used with -V or -r");
1217 if (VFileName != NULL && RFileName != NULL)
1218 error("-V and -r are mutually exclusive.");
1221 /* if run as root, prepare for chrooting */
1222 if (getuid() == 0 || geteuid() == 0) {
1223 /* future extensibility for cmd-line arguments */
1225 chroot_dir = WITH_CHROOT;
1230 /* if run as root, prepare for dropping root privileges */
1231 if (getuid() == 0 || geteuid() == 0) {
1232 /* Run with '-Z root' to restore old behaviour */
1234 username = WITH_USER;
1238 if (RFileName != NULL || VFileName != NULL) {
1240 * If RFileName is non-null, it's the pathname of a
1241 * savefile to read. If VFileName is non-null, it's
1242 * the pathname of a file containing a list of pathnames
1243 * (one per line) of savefiles to read.
1245 * In either case, we're reading a savefile, not doing
1250 * We don't need network access, so relinquish any set-UID
1251 * or set-GID privileges we have (if any).
1253 * We do *not* want set-UID privileges when opening a
1254 * trace file, as that might let the user read other
1255 * people's trace files (especially if we're set-UID
1258 if (setgid(getgid()) != 0 || setuid(getuid()) != 0 )
1259 fprintf(stderr, "Warning: setgid/setuid failed !\n");
1261 if (VFileName != NULL) {
1262 if (VFileName[0] == '-' && VFileName[1] == '\0')
1265 VFile = fopen(VFileName, "r");
1268 error("Unable to open file: %s\n", strerror(errno));
1270 ret = get_next_file(VFile, VFileLine);
1272 error("Nothing in %s\n", VFileName);
1273 RFileName = VFileLine;
1276 pd = pcap_open_offline(RFileName, ebuf);
1280 cap_rights_init(&rights, CAP_READ);
1281 if (cap_rights_limit(fileno(pcap_file(pd)), &rights) < 0 &&
1283 error("unable to limit pcap descriptor");
1286 dlt = pcap_datalink(pd);
1287 dlt_name = pcap_datalink_val_to_name(dlt);
1288 if (dlt_name == NULL) {
1289 fprintf(stderr, "reading from file %s, link-type %u\n",
1293 "reading from file %s, link-type %s (%s)\n",
1294 RFileName, dlt_name,
1295 pcap_datalink_val_to_description(dlt));
1301 * We're doing a live capture.
1303 if (device == NULL) {
1304 device = pcap_lookupdev(ebuf);
1310 * Print a message to the standard error on Windows.
1311 * XXX - why do it here, with a different message?
1313 if(strlen(device) == 1) //we assume that an ASCII string is always longer than 1 char
1314 { //a Unicode string has a \0 as second byte (so strlen() is 1)
1315 fprintf(stderr, "%s: listening on %ws\n", program_name, device);
1319 fprintf(stderr, "%s: listening on %s\n", program_name, device);
1324 #ifdef HAVE_PCAP_CREATE
1325 pd = pcap_create(device, ebuf);
1328 #ifdef HAVE_PCAP_SET_TSTAMP_TYPE
1330 show_tstamp_types_and_exit(device, pd);
1333 * Is this an interface that supports monitor mode?
1335 if (pcap_can_set_rfmon(pd) == 1)
1336 supports_monitor_mode = 1;
1338 supports_monitor_mode = 0;
1339 status = pcap_set_snaplen(pd, snaplen);
1341 error("%s: Can't set snapshot length: %s",
1342 device, pcap_statustostr(status));
1343 status = pcap_set_promisc(pd, !pflag);
1345 error("%s: Can't set promiscuous mode: %s",
1346 device, pcap_statustostr(status));
1348 status = pcap_set_rfmon(pd, 1);
1350 error("%s: Can't set monitor mode: %s",
1351 device, pcap_statustostr(status));
1353 status = pcap_set_timeout(pd, 1000);
1355 error("%s: pcap_set_timeout failed: %s",
1356 device, pcap_statustostr(status));
1358 status = pcap_set_buffer_size(pd, Bflag);
1360 error("%s: Can't set buffer size: %s",
1361 device, pcap_statustostr(status));
1363 #ifdef HAVE_PCAP_SET_TSTAMP_TYPE
1365 status = pcap_set_tstamp_type(pd, jflag);
1367 error("%s: Can't set time stamp type: %s",
1368 device, pcap_statustostr(status));
1371 status = pcap_activate(pd);
1374 * pcap_activate() failed.
1376 cp = pcap_geterr(pd);
1377 if (status == PCAP_ERROR)
1379 else if ((status == PCAP_ERROR_NO_SUCH_DEVICE ||
1380 status == PCAP_ERROR_PERM_DENIED) &&
1382 error("%s: %s\n(%s)", device,
1383 pcap_statustostr(status), cp);
1385 else if (status == PCAP_ERROR_RFMON_NOTSUP &&
1386 strncmp(device, "wlan", 4) == 0) {
1387 char parent[8], newdev[8];
1389 size_t s = sizeof(parent);
1391 snprintf(sysctl, sizeof(sysctl),
1392 "net.wlan.%d.%%parent", atoi(device + 4));
1393 sysctlbyname(sysctl, parent, &s, NULL, 0);
1394 strlcpy(newdev, device, sizeof(newdev));
1395 /* Suggest a new wlan device. */
1396 newdev[strlen(newdev)-1]++;
1397 error("%s is not a monitor mode VAP\n"
1398 "To create a new monitor mode VAP use:\n"
1399 " ifconfig %s create wlandev %s wlanmode "
1400 "monitor\nand use %s as the tcpdump "
1401 "interface", device, newdev, parent,
1406 error("%s: %s", device,
1407 pcap_statustostr(status));
1408 } else if (status > 0) {
1410 * pcap_activate() succeeded, but it's warning us
1411 * of a problem it had.
1413 cp = pcap_geterr(pd);
1414 if (status == PCAP_WARNING)
1416 else if (status == PCAP_WARNING_PROMISC_NOTSUP &&
1418 warning("%s: %s\n(%s)", device,
1419 pcap_statustostr(status), cp);
1421 warning("%s: %s", device,
1422 pcap_statustostr(status));
1426 pd = pcap_open_live(device, snaplen, !pflag, 1000, ebuf);
1430 warning("%s", ebuf);
1431 #endif /* HAVE_PCAP_CREATE */
1433 * Let user own process after socket has been opened.
1436 if (setgid(getgid()) != 0 || setuid(getuid()) != 0)
1437 fprintf(stderr, "Warning: setgid/setuid failed !\n");
1439 #if !defined(HAVE_PCAP_CREATE) && defined(WIN32)
1441 if(pcap_setbuff(pd, Bflag)==-1){
1442 error("%s", pcap_geterr(pd));
1444 #endif /* !defined(HAVE_PCAP_CREATE) && defined(WIN32) */
1446 show_dlts_and_exit(device, pd);
1447 if (gndo->ndo_dlt >= 0) {
1448 #ifdef HAVE_PCAP_SET_DATALINK
1449 if (pcap_set_datalink(pd, gndo->ndo_dlt) < 0)
1450 error("%s", pcap_geterr(pd));
1453 * We don't actually support changing the
1454 * data link type, so we only let them
1455 * set it to what it already is.
1457 if (gndo->ndo_dlt != pcap_datalink(pd)) {
1458 error("%s is not one of the DLTs supported by this device\n",
1462 (void)fprintf(stderr, "%s: data link type %s\n",
1463 program_name, gndo->ndo_dltname);
1464 (void)fflush(stderr);
1466 i = pcap_snapshot(pd);
1468 warning("snaplen raised from %d to %d", snaplen, i);
1471 if (pcap_lookupnet(device, &localnet, &netmask, ebuf) < 0) {
1474 warning("%s", ebuf);
1478 cmdbuf = read_infile(infile);
1480 cmdbuf = copy_argv(&argv[optind]);
1482 if (pcap_compile(pd, &fcode, cmdbuf, Oflag, netmask) < 0)
1483 error("%s", pcap_geterr(pd));
1485 bpf_dump(&fcode, dflag);
1490 init_addrtoname(localnet, netmask);
1494 (void)setsignal(SIGPIPE, cleanup);
1495 (void)setsignal(SIGTERM, cleanup);
1496 (void)setsignal(SIGINT, cleanup);
1498 #if defined(HAVE_FORK) || defined(HAVE_VFORK)
1499 (void)setsignal(SIGCHLD, child_cleanup);
1501 /* Cooperate with nohup(1) */
1503 if ((oldhandler = setsignal(SIGHUP, cleanup)) != SIG_DFL)
1504 (void)setsignal(SIGHUP, oldhandler);
1509 * If a user name was specified with "-Z", attempt to switch to
1510 * that user's UID. This would probably be used with sudo,
1511 * to allow tcpdump to be run in a special restricted
1512 * account (if you just want to allow users to open capture
1513 * devices, and can't just give users that permission,
1514 * you'd make tcpdump set-UID or set-GID).
1516 * Tcpdump doesn't necessarily write only to one savefile;
1517 * the general only way to allow a -Z instance to write to
1518 * savefiles as the user under whose UID it's run, rather
1519 * than as the user specified with -Z, would thus be to switch
1520 * to the original user ID before opening a capture file and
1521 * then switch back to the -Z user ID after opening the savefile.
1522 * Switching to the -Z user ID only after opening the first
1523 * savefile doesn't handle the general case.
1526 #ifdef HAVE_CAP_NG_H
1527 /* We are running as root and we will be writing to savefile */
1528 if ((getuid() == 0 || geteuid() == 0) && WFileName) {
1530 /* Drop all capabilities from effective set */
1531 capng_clear(CAPNG_EFFECTIVE);
1532 /* Add capabilities we will need*/
1533 capng_update(CAPNG_ADD, CAPNG_PERMITTED, CAP_SETUID);
1534 capng_update(CAPNG_ADD, CAPNG_PERMITTED, CAP_SETGID);
1535 capng_update(CAPNG_ADD, CAPNG_PERMITTED, CAP_DAC_OVERRIDE);
1537 capng_update(CAPNG_ADD, CAPNG_EFFECTIVE, CAP_SETUID);
1538 capng_update(CAPNG_ADD, CAPNG_EFFECTIVE, CAP_SETGID);
1539 capng_update(CAPNG_ADD, CAPNG_EFFECTIVE, CAP_DAC_OVERRIDE);
1541 capng_apply(CAPNG_SELECT_BOTH);
1544 #endif /* HAVE_CAP_NG_H */
1546 if (getuid() == 0 || geteuid() == 0) {
1547 if (username || chroot_dir)
1548 droproot(username, chroot_dir);
1553 if (pcap_setfilter(pd, &fcode) < 0)
1554 error("%s", pcap_geterr(pd));
1556 if (RFileName == NULL && VFileName == NULL) {
1557 static const unsigned long cmds[] = { BIOCGSTATS };
1560 * The various libpcap devices use a combination of
1561 * read (bpf), ioctl (bpf, netmap), poll (netmap).
1562 * Grant the relevant access rights, sorted by name.
1564 cap_rights_init(&rights, CAP_EVENT, CAP_IOCTL, CAP_READ);
1565 if (cap_rights_limit(pcap_fileno(pd), &rights) < 0 &&
1567 error("unable to limit pcap descriptor");
1569 if (cap_ioctls_limit(pcap_fileno(pd), cmds,
1570 sizeof(cmds) / sizeof(cmds[0])) < 0 && errno != ENOSYS) {
1571 error("unable to limit ioctls on pcap descriptor");
1577 /* Do not exceed the default PATH_MAX for files. */
1578 dumpinfo.CurrentFileName = (char *)malloc(PATH_MAX + 1);
1580 if (dumpinfo.CurrentFileName == NULL)
1581 error("malloc of dumpinfo.CurrentFileName");
1583 /* We do not need numbering for dumpfiles if Cflag isn't set. */
1585 MakeFilename(dumpinfo.CurrentFileName, WFileName, 0, WflagChars);
1587 MakeFilename(dumpinfo.CurrentFileName, WFileName, 0, 0);
1589 p = pcap_dump_open(pd, dumpinfo.CurrentFileName);
1590 #ifdef HAVE_CAP_NG_H
1591 /* Give up capabilities, clear Effective set */
1592 capng_clear(CAPNG_EFFECTIVE);
1595 error("%s", pcap_geterr(pd));
1597 set_dumper_capsicum_rights(p);
1599 if (Cflag != 0 || Gflag != 0) {
1601 dumpinfo.WFileName = strdup(basename(WFileName));
1602 dumpinfo.dirfd = open(dirname(WFileName),
1603 O_DIRECTORY | O_RDONLY);
1604 if (dumpinfo.dirfd < 0) {
1605 error("unable to open directory %s",
1606 dirname(WFileName));
1608 cap_rights_init(&rights, CAP_CREATE, CAP_FCNTL,
1609 CAP_FTRUNCATE, CAP_LOOKUP, CAP_SEEK, CAP_WRITE);
1610 if (cap_rights_limit(dumpinfo.dirfd, &rights) < 0 &&
1612 error("unable to limit directory rights");
1614 if (cap_fcntls_limit(fileno(pcap_dump_file(p)), CAP_FCNTL_GETFL) < 0 &&
1616 error("unable to limit dump descriptor fcntls");
1618 #else /* !__FreeBSD__ */
1619 dumpinfo.WFileName = WFileName;
1621 callback = dump_packet_and_trunc;
1624 pcap_userdata = (u_char *)&dumpinfo;
1626 callback = dump_packet;
1627 pcap_userdata = (u_char *)p;
1629 #ifdef HAVE_PCAP_DUMP_FLUSH
1634 type = pcap_datalink(pd);
1635 printinfo = get_print_info(type);
1636 callback = print_packet;
1637 pcap_userdata = (u_char *)&printinfo;
1640 #ifdef SIGNAL_REQ_INFO
1642 * We can't get statistics when reading from a file rather
1643 * than capturing from a device.
1645 if (RFileName == NULL)
1646 (void)setsignal(SIGNAL_REQ_INFO, requestinfo);
1649 if (vflag > 0 && WFileName) {
1651 * When capturing to a file, "-v" means tcpdump should,
1652 * every 10 secodns, "v"erbosely report the number of
1655 #ifdef USE_WIN32_MM_TIMER
1656 /* call verbose_stats_dump() each 1000 +/-100msec */
1657 timer_id = timeSetEvent(1000, 100, verbose_stats_dump, 0, TIME_PERIODIC);
1658 setvbuf(stderr, NULL, _IONBF, 0);
1659 #elif defined(HAVE_ALARM)
1660 (void)setsignal(SIGALRM, verbose_stats_dump);
1666 if (RFileName == NULL) {
1668 * Live capture (if -V was specified, we set RFileName
1669 * to a file from the -V file). Print a message to
1670 * the standard error on UN*X.
1672 if (!vflag && !WFileName) {
1673 (void)fprintf(stderr,
1674 "%s: verbose output suppressed, use -v or -vv for full protocol decode\n",
1677 (void)fprintf(stderr, "%s: ", program_name);
1678 dlt = pcap_datalink(pd);
1679 dlt_name = pcap_datalink_val_to_name(dlt);
1680 if (dlt_name == NULL) {
1681 (void)fprintf(stderr, "listening on %s, link-type %u, capture size %u bytes\n",
1682 device, dlt, snaplen);
1684 (void)fprintf(stderr, "listening on %s, link-type %s (%s), capture size %u bytes\n",
1686 pcap_datalink_val_to_description(dlt), snaplen);
1688 (void)fflush(stderr);
1693 cansandbox = (nflag && VFileName == NULL && zflag == NULL);
1694 if (cansandbox && cap_enter() < 0 && errno != ENOSYS)
1695 error("unable to enter the capability mode");
1696 #endif /* __FreeBSD__ */
1699 status = pcap_loop(pd, cnt, callback, pcap_userdata);
1700 if (WFileName == NULL) {
1702 * We're printing packets. Flush the printed output,
1703 * so it doesn't get intermingled with error output.
1707 * We got interrupted, so perhaps we didn't
1708 * manage to finish a line we were printing.
1709 * Print an extra newline, just in case.
1713 (void)fflush(stdout);
1719 (void)fprintf(stderr, "%s: pcap_loop: %s\n",
1720 program_name, pcap_geterr(pd));
1722 if (RFileName == NULL) {
1724 * We're doing a live capture. Report the capture
1730 if (VFileName != NULL) {
1731 ret = get_next_file(VFile, VFileLine);
1733 RFileName = VFileLine;
1734 pd = pcap_open_offline(RFileName, ebuf);
1738 cap_rights_init(&rights, CAP_READ);
1739 if (cap_rights_limit(fileno(pcap_file(pd)),
1740 &rights) < 0 && errno != ENOSYS) {
1741 error("unable to limit pcap descriptor");
1744 new_dlt = pcap_datalink(pd);
1745 if (WFileName && new_dlt != dlt)
1746 error("%s: new dlt does not match original", RFileName);
1747 printinfo = get_print_info(new_dlt);
1748 dlt_name = pcap_datalink_val_to_name(new_dlt);
1749 if (dlt_name == NULL) {
1750 fprintf(stderr, "reading from file %s, link-type %u\n",
1751 RFileName, new_dlt);
1754 "reading from file %s, link-type %s (%s)\n",
1755 RFileName, dlt_name,
1756 pcap_datalink_val_to_description(new_dlt));
1758 if (pcap_compile(pd, &fcode, cmdbuf, Oflag, netmask) < 0)
1759 error("%s", pcap_geterr(pd));
1760 if (pcap_setfilter(pd, &fcode) < 0)
1761 error("%s", pcap_geterr(pd));
1765 while (ret != NULL);
1768 exit(status == -1 ? 1 : 0);
1771 /* make a clean exit on interrupts */
1773 cleanup(int signo _U_)
1775 #ifdef USE_WIN32_MM_TIMER
1777 timeKillEvent(timer_id);
1779 #elif defined(HAVE_ALARM)
1783 #ifdef HAVE_PCAP_BREAKLOOP
1785 * We have "pcap_breakloop()"; use it, so that we do as little
1786 * as possible in the signal handler (it's probably not safe
1787 * to do anything with standard I/O streams in a signal handler -
1788 * the ANSI C standard doesn't say it is).
1793 * We don't have "pcap_breakloop()"; this isn't safe, but
1794 * it's the best we can do. Print the summary if we're
1795 * not reading from a savefile - i.e., if we're doing a
1796 * live capture - and exit.
1798 if (pd != NULL && pcap_file(pd) == NULL) {
1800 * We got interrupted, so perhaps we didn't
1801 * manage to finish a line we were printing.
1802 * Print an extra newline, just in case.
1805 (void)fflush(stdout);
1813 On windows, we do not use a fork, so we do not care less about
1814 waiting a child processes to die
1816 #if defined(HAVE_FORK) || defined(HAVE_VFORK)
1818 child_cleanup(int signo _U_)
1822 #endif /* HAVE_FORK && HAVE_VFORK */
1825 info(register int verbose)
1827 struct pcap_stat stat;
1830 * Older versions of libpcap didn't set ps_ifdrop on some
1831 * platforms; initialize it to 0 to handle that.
1834 if (pcap_stats(pd, &stat) < 0) {
1835 (void)fprintf(stderr, "pcap_stats: %s\n", pcap_geterr(pd));
1841 fprintf(stderr, "%s: ", program_name);
1843 (void)fprintf(stderr, "%u packet%s captured", packets_captured,
1844 PLURAL_SUFFIX(packets_captured));
1846 fputs(", ", stderr);
1849 (void)fprintf(stderr, "%u packet%s received by filter", stat.ps_recv,
1850 PLURAL_SUFFIX(stat.ps_recv));
1852 fputs(", ", stderr);
1855 (void)fprintf(stderr, "%u packet%s dropped by kernel", stat.ps_drop,
1856 PLURAL_SUFFIX(stat.ps_drop));
1857 if (stat.ps_ifdrop != 0) {
1859 fputs(", ", stderr);
1862 (void)fprintf(stderr, "%u packet%s dropped by interface\n",
1863 stat.ps_ifdrop, PLURAL_SUFFIX(stat.ps_ifdrop));
1869 #if defined(HAVE_FORK) || defined(HAVE_VFORK)
1871 compress_savefile(const char *filename)
1880 * Set to lowest priority so that this doesn't disturb the capture
1883 setpriority(PRIO_PROCESS, 0, NZERO - 1);
1885 setpriority(PRIO_PROCESS, 0, 19);
1887 if (execlp(zflag, zflag, filename, (char *)NULL) == -1)
1889 "compress_savefile:execlp(%s, %s): %s\n",
1899 #else /* HAVE_FORK && HAVE_VFORK */
1901 compress_savefile(const char *filename)
1904 "compress_savefile failed. Functionality not implemented under your system\n");
1906 #endif /* HAVE_FORK && HAVE_VFORK */
1909 dump_packet_and_trunc(u_char *user, const struct pcap_pkthdr *h, const u_char *sp)
1911 struct dump_info *dump_info;
1917 dump_info = (struct dump_info *)user;
1920 * XXX - this won't force the file to rotate on the specified time
1921 * boundary, but it will rotate on the first packet received after the
1922 * specified Gflag number of seconds. Note: if a Gflag time boundary
1923 * and a Cflag size boundary coincide, the time rotation will occur
1924 * first thereby cancelling the Cflag boundary (since the file should
1928 /* Check if it is time to rotate */
1931 /* Get the current time */
1932 if ((t = time(NULL)) == (time_t)-1) {
1933 error("dump_and_trunc_packet: can't get current_time: %s",
1934 pcap_strerror(errno));
1938 /* If the time is greater than the specified window, rotate */
1939 if (t - Gflag_time >= Gflag) {
1945 /* Update the Gflag_time */
1947 /* Update Gflag_count */
1950 * Close the current file and open a new one.
1952 pcap_dump_close(dump_info->p);
1955 * Compress the file we just closed, if the user asked for it
1958 compress_savefile(dump_info->CurrentFileName);
1961 * Check to see if we've exceeded the Wflag (when
1964 if (Cflag == 0 && Wflag > 0 && Gflag_count >= Wflag) {
1965 (void)fprintf(stderr, "Maximum file limit reached: %d\n",
1970 if (dump_info->CurrentFileName != NULL)
1971 free(dump_info->CurrentFileName);
1972 /* Allocate space for max filename + \0. */
1973 dump_info->CurrentFileName = (char *)malloc(PATH_MAX + 1);
1974 if (dump_info->CurrentFileName == NULL)
1975 error("dump_packet_and_trunc: malloc");
1977 * This is always the first file in the Cflag
1979 * We also don't need numbering if Cflag is not set.
1982 MakeFilename(dump_info->CurrentFileName, dump_info->WFileName, 0,
1985 MakeFilename(dump_info->CurrentFileName, dump_info->WFileName, 0, 0);
1987 #ifdef HAVE_CAP_NG_H
1988 capng_update(CAPNG_ADD, CAPNG_EFFECTIVE, CAP_DAC_OVERRIDE);
1989 capng_apply(CAPNG_EFFECTIVE);
1990 #endif /* HAVE_CAP_NG_H */
1992 fd = openat(dump_info->dirfd,
1993 dump_info->CurrentFileName,
1994 O_CREAT | O_WRONLY | O_TRUNC, 0644);
1996 error("unable to open file %s",
1997 dump_info->CurrentFileName);
1999 fp = fdopen(fd, "w");
2001 error("unable to fdopen file %s",
2002 dump_info->CurrentFileName);
2004 dump_info->p = pcap_dump_fopen(dump_info->pd, fp);
2005 #else /* !__FreeBSD__ */
2006 dump_info->p = pcap_dump_open(dump_info->pd, dump_info->CurrentFileName);
2008 #ifdef HAVE_CAP_NG_H
2009 capng_update(CAPNG_DROP, CAPNG_EFFECTIVE, CAP_DAC_OVERRIDE);
2010 capng_apply(CAPNG_EFFECTIVE);
2011 #endif /* HAVE_CAP_NG_H */
2012 if (dump_info->p == NULL)
2013 error("%s", pcap_geterr(pd));
2015 set_dumper_capsicum_rights(dump_info->p);
2021 * XXX - this won't prevent capture files from getting
2022 * larger than Cflag - the last packet written to the
2023 * file could put it over Cflag.
2025 if (Cflag != 0 && pcap_dump_ftell(dump_info->p) > Cflag) {
2032 * Close the current file and open a new one.
2034 pcap_dump_close(dump_info->p);
2037 * Compress the file we just closed, if the user asked for it
2040 compress_savefile(dump_info->CurrentFileName);
2044 if (Cflag_count >= Wflag)
2047 if (dump_info->CurrentFileName != NULL)
2048 free(dump_info->CurrentFileName);
2049 dump_info->CurrentFileName = (char *)malloc(PATH_MAX + 1);
2050 if (dump_info->CurrentFileName == NULL)
2051 error("dump_packet_and_trunc: malloc");
2052 MakeFilename(dump_info->CurrentFileName, dump_info->WFileName, Cflag_count, WflagChars);
2054 fd = openat(dump_info->dirfd, dump_info->CurrentFileName,
2055 O_CREAT | O_WRONLY | O_TRUNC, 0644);
2057 error("unable to open file %s",
2058 dump_info->CurrentFileName);
2060 fp = fdopen(fd, "w");
2062 error("unable to fdopen file %s",
2063 dump_info->CurrentFileName);
2065 dump_info->p = pcap_dump_fopen(dump_info->pd, fp);
2066 #else /* !__FreeBSD__ */
2067 dump_info->p = pcap_dump_open(dump_info->pd, dump_info->CurrentFileName);
2069 if (dump_info->p == NULL)
2070 error("%s", pcap_geterr(pd));
2072 set_dumper_capsicum_rights(dump_info->p);
2076 pcap_dump((u_char *)dump_info->p, h, sp);
2077 #ifdef HAVE_PCAP_DUMP_FLUSH
2079 pcap_dump_flush(dump_info->p);
2088 dump_packet(u_char *user, const struct pcap_pkthdr *h, const u_char *sp)
2094 pcap_dump(user, h, sp);
2095 #ifdef HAVE_PCAP_DUMP_FLUSH
2097 pcap_dump_flush((pcap_dumper_t *)user);
2106 print_packet(u_char *user, const struct pcap_pkthdr *h, const u_char *sp)
2108 struct print_info *print_info;
2116 print_info = (struct print_info *)user;
2119 * Some printers want to check that they're not walking off the
2120 * end of the packet.
2121 * Rather than pass it all the way down, we set this global.
2123 snapend = sp + h->caplen;
2125 if(print_info->ndo_type) {
2126 hdrlen = (*print_info->p.ndo_printer)(print_info->ndo, h, sp);
2128 hdrlen = (*print_info->p.printer)(h, sp);
2133 * Print the raw packet data in hex and ASCII.
2137 * Include the link-layer header.
2139 hex_and_ascii_print("\n\t", sp, h->caplen);
2142 * Don't include the link-layer header - and if
2143 * we have nothing past the link-layer header,
2146 if (h->caplen > hdrlen)
2147 hex_and_ascii_print("\n\t", sp + hdrlen,
2148 h->caplen - hdrlen);
2152 * Print the raw packet data in hex.
2156 * Include the link-layer header.
2158 hex_print("\n\t", sp, h->caplen);
2161 * Don't include the link-layer header - and if
2162 * we have nothing past the link-layer header,
2165 if (h->caplen > hdrlen)
2166 hex_print("\n\t", sp + hdrlen,
2167 h->caplen - hdrlen);
2171 * Print the raw packet data in ASCII.
2175 * Include the link-layer header.
2177 ascii_print(sp, h->caplen);
2180 * Don't include the link-layer header - and if
2181 * we have nothing past the link-layer header,
2184 if (h->caplen > hdrlen)
2185 ascii_print(sp + hdrlen, h->caplen - hdrlen);
2198 * XXX - there should really be libpcap calls to get the version
2199 * number as a string (the string would be generated from #defines
2200 * at run time, so that it's not generated from string constants
2201 * in the library, as, on many UNIX systems, those constants would
2202 * be statically linked into the application executable image, and
2203 * would thus reflect the version of libpcap on the system on
2204 * which the application was *linked*, not the system on which it's
2207 * That routine should be documented, unlike the "version[]"
2208 * string, so that UNIX vendors providing their own libpcaps
2209 * don't omit it (as a couple of vendors have...).
2211 * Packet.dll should perhaps also export a routine to return the
2212 * version number of the Packet.dll code, to supply the
2213 * "Wpcap_version" information on Windows.
2215 char WDversion[]="current-cvs.tcpdump.org";
2216 #if !defined(HAVE_GENERATED_VERSION)
2217 char version[]="current-cvs.tcpdump.org";
2219 char pcap_version[]="current-cvs.tcpdump.org";
2220 char Wpcap_version[]="3.1";
2224 * By default, print the specified data out in hex and ASCII.
2227 ndo_default_print(netdissect_options *ndo _U_, const u_char *bp, u_int length)
2229 hex_and_ascii_print("\n\t", bp, length); /* pass on lf and identation string */
2233 default_print(const u_char *bp, u_int length)
2235 ndo_default_print(gndo, bp, length);
2238 #ifdef SIGNAL_REQ_INFO
2239 RETSIGTYPE requestinfo(int signo _U_)
2249 * Called once each second in verbose mode while dumping to file
2251 #ifdef USE_WIN32_MM_TIMER
2252 void CALLBACK verbose_stats_dump (UINT timer_id _U_, UINT msg _U_, DWORD_PTR arg _U_,
2253 DWORD_PTR dw1 _U_, DWORD_PTR dw2 _U_)
2255 struct pcap_stat stat;
2257 if (infodelay == 0 && pcap_stats(pd, &stat) >= 0)
2258 fprintf(stderr, "Got %u\r", packets_captured);
2260 #elif defined(HAVE_ALARM)
2261 static void verbose_stats_dump(int sig _U_)
2263 struct pcap_stat stat;
2265 if (infodelay == 0 && pcap_stats(pd, &stat) >= 0)
2266 fprintf(stderr, "Got %u\r", packets_captured);
2274 extern char version[];
2275 #ifndef HAVE_PCAP_LIB_VERSION
2276 #if defined(WIN32) || defined(HAVE_PCAP_VERSION)
2277 extern char pcap_version[];
2278 #else /* defined(WIN32) || defined(HAVE_PCAP_VERSION) */
2279 static char pcap_version[] = "unknown";
2280 #endif /* defined(WIN32) || defined(HAVE_PCAP_VERSION) */
2281 #endif /* HAVE_PCAP_LIB_VERSION */
2283 #ifdef HAVE_PCAP_LIB_VERSION
2285 (void)fprintf(stderr, "%s version %s, based on tcpdump version %s\n", program_name, WDversion, version);
2287 (void)fprintf(stderr, "%s version %s\n", program_name, version);
2289 (void)fprintf(stderr, "%s\n",pcap_lib_version());
2290 #else /* HAVE_PCAP_LIB_VERSION */
2292 (void)fprintf(stderr, "%s version %s, based on tcpdump version %s\n", program_name, WDversion, version);
2293 (void)fprintf(stderr, "WinPcap version %s, based on libpcap version %s\n",Wpcap_version, pcap_version);
2295 (void)fprintf(stderr, "%s version %s\n", program_name, version);
2296 (void)fprintf(stderr, "libpcap version %s\n", pcap_version);
2298 #endif /* HAVE_PCAP_LIB_VERSION */
2299 (void)fprintf(stderr,
2300 "Usage: %s [-aAbd" D_FLAG "efhH" I_FLAG J_FLAG "KlLnNOpqRStu" U_FLAG "vxX]" B_FLAG_USAGE " [ -c count ]\n", program_name);
2301 (void)fprintf(stderr,
2302 "\t\t[ -C file_size ] [ -E algo:secret ] [ -F file ] [ -G seconds ]\n");
2303 (void)fprintf(stderr,
2304 "\t\t[ -i interface ]" j_FLAG_USAGE " [ -M secret ]\n");
2305 (void)fprintf(stderr,
2306 "\t\t[ -r file ] [ -s snaplen ] [ -T type ] [ -V file ] [ -w file ]\n");
2307 (void)fprintf(stderr,
2308 "\t\t[ -W filecount ] [ -y datalinktype ] [ -z command ]\n");
2309 (void)fprintf(stderr,
2310 "\t\t[ -Z user ] [ expression ]\n");
2318 ndo_error(netdissect_options *ndo _U_, const char *fmt, ...)
2322 (void)fprintf(stderr, "%s: ", program_name);
2324 (void)vfprintf(stderr, fmt, ap);
2328 if (fmt[-1] != '\n')
2329 (void)fputc('\n', stderr);
2337 ndo_warning(netdissect_options *ndo _U_, const char *fmt, ...)
2341 (void)fprintf(stderr, "%s: WARNING: ", program_name);
2343 (void)vfprintf(stderr, fmt, ap);
2347 if (fmt[-1] != '\n')
2348 (void)fputc('\n', stderr);