3 * $Id: tethereal.c,v 1.112 2001/12/21 20:32:53 guy Exp $
5 * Ethereal - Network traffic analyzer
6 * By Gerald Combs <gerald@ethereal.com>
7 * Copyright 1998 Gerald Combs
9 * Text-mode variant, by Gilbert Ramirez <gram@alumni.rice.edu>
10 * and Guy Harris <guy@alum.mit.edu>.
12 * This program is free software; you can redistribute it and/or
13 * modify it under the terms of the GNU General Public License
14 * as published by the Free Software Foundation; either version 2
15 * of the License, or (at your option) any later version.
17 * This program is distributed in the hope that it will be useful,
18 * but WITHOUT ANY WARRANTY; without even the implied warranty of
19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
20 * GNU General Public License for more details.
22 * You should have received a copy of the GNU General Public License
23 * along with this program; if not, write to the Free Software
24 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
44 #ifdef HAVE_SYS_TYPES_H
45 #include <sys/types.h>
48 #ifdef HAVE_SYS_STAT_H
63 #include <zlib.h> /* to get the libz version number */
66 #ifdef NEED_SNPRINTF_H
67 # include "snprintf.h"
70 #if defined(HAVE_UCD_SNMP_SNMP_H)
71 #ifdef HAVE_UCD_SNMP_VERSION_H
72 #include <ucd-snmp/version.h>
73 #endif /* HAVE_UCD_SNMP_VERSION_H */
74 #elif defined(HAVE_SNMP_SNMP_H)
75 #ifdef HAVE_SNMP_VERSION_H
76 #include <snmp/version.h>
77 #endif /* HAVE_SNMP_VERSION_H */
80 #ifdef NEED_STRERROR_H
92 #include "timestamp.h"
101 #include "pcap-util.h"
103 #include "conversation.h"
104 #include "reassemble.h"
106 #include "register.h"
107 #include "conditions.h"
108 #include "capture_stop_conditions.h"
109 #include "ringbuffer.h"
110 #include "epan_dissect.h"
113 #include "capture-wpcap.h"
116 static guint32 firstsec, firstusec;
117 static guint32 prevsec, prevusec;
118 static GString *comp_info_str;
119 static gboolean verbose;
120 static gboolean print_hex;
121 static gboolean line_buffered;
124 typedef struct _loop_data {
133 static int capture(int, int);
134 static void capture_pcap_cb(u_char *, const struct pcap_pkthdr *,
136 static void capture_cleanup(int);
144 static int load_cap_file(capture_file *, int);
145 static void wtap_dispatch_cb_write(u_char *, const struct wtap_pkthdr *, long,
146 union wtap_pseudo_header *, const u_char *);
147 static void show_capture_file_io_error(const char *, int, gboolean);
148 static void wtap_dispatch_cb_print(u_char *, const struct wtap_pkthdr *, long,
149 union wtap_pseudo_header *, const u_char *);
152 FILE *data_out_file = NULL;
153 ts_type timestamp_type = RELATIVE;
155 static int promisc_mode = TRUE;
163 fprintf(stderr, "This is GNU t%s %s, compiled %s\n", PACKAGE, VERSION,
166 fprintf(stderr, "t%s [ -DvVhlp ] [ -a <capture autostop condition> ] ...\n",
168 fprintf(stderr, "\t[ -b <number of ring buffer files> ] [ -c <count> ]\n");
169 fprintf(stderr, "\t[ -f <capture filter> ] [ -F <capture file type> ]\n");
170 fprintf(stderr, "\t[ -i <interface> ] [ -n ] [ -N <resolving> ]\n");
171 fprintf(stderr, "\t[ -o <preference setting> ] ... [ -r <infile> ] [ -R <read filter> ]\n");
172 fprintf(stderr, "\t[ -s <snaplen> ] [ -t <time stamp format> ] [ -w <savefile> ] [ -x ]\n");
174 fprintf(stderr, "t%s [ -vVhl ] [ -F <capture file type> ] [ -n ] [ -N <resolving> ]\n", PACKAGE);
175 fprintf(stderr, "\t[ -o <preference setting> ] ... [ -r <infile> ] [ -R <read filter> ]\n");
176 fprintf(stderr, "\t[ -t <time stamp format> ] [ -w <savefile> ] [ -x ]\n");
178 fprintf(stderr, "Valid file type arguments to the \"-F\" flag:\n");
179 for (i = 0; i < WTAP_NUM_FILE_TYPES; i++) {
180 if (wtap_dump_can_open(i))
181 fprintf(stderr, "\t%s - %s\n",
182 wtap_file_type_short_string(i), wtap_file_type_string(i));
184 fprintf(stderr, "\tdefault is libpcap\n");
188 get_positive_int(const char *string, const char *name)
193 number = strtol(string, &p, 10);
194 if (p == string || *p != '\0') {
195 fprintf(stderr, "tethereal: The specified %s \"%s\" is not a decimal number\n",
200 fprintf(stderr, "tethereal: The specified %s \"%s\" is a negative number\n",
204 if (number > INT_MAX) {
205 fprintf(stderr, "tethereal: The specified %s \"%s\" is too large (greater than %d)\n",
206 name, string, INT_MAX);
213 * Given a string of the form "<autostop criterion>:<value>", as might appear
214 * as an argument to a "-a" option, parse it and set the criterion in
215 * question. Return an indication of whether it succeeded or failed
219 set_autostop_criterion(const char *autostoparg)
223 colonp = strchr(autostoparg, ':');
231 * Skip over any white space (there probably won't be any, but
232 * as we allow it in the preferences file, we might as well
239 * Put the colon back, so if our caller uses, in an
240 * error message, the string they passed us, the message
246 if (strcmp(autostoparg,"duration") == 0) {
247 cfile.autostop_duration = get_positive_int(p,"autostop duration");
248 } else if (strcmp(autostoparg,"filesize") == 0) {
249 cfile.autostop_filesize = get_positive_int(p,"autostop filesize");
253 *colonp = ':'; /* put the colon back */
258 main(int argc, char *argv[])
262 gboolean arg_error = FALSE;
264 #ifdef HAVE_PCAP_VERSION
265 extern char pcap_version[];
266 #endif /* HAVE_PCAP_VERSION */
267 #endif /* HAVE_LIBPCAP */
275 int gpf_open_errno, pf_open_errno;
278 gboolean capture_filter_specified = FALSE;
279 guint packet_count = 0;
280 GList *if_list, *if_entry;
281 gchar err_str[PCAP_ERRBUF_SIZE];
283 gboolean capture_option_specified = FALSE;
285 int out_file_type = WTAP_FILE_PCAP;
286 gchar *cf_name = NULL, *rfilter = NULL;
287 dfilter_t *rfcode = NULL;
291 /* Register all dissectors; we must do this before checking for the
292 "-G" flag, as the "-G" flag dumps a list of fields registered
293 by the dissectors, and we must do it before we read the preferences,
294 in case any dissectors register preferences. */
295 epan_init(PLUGIN_DIR,register_all_protocols,register_all_protocol_handoffs);
297 /* Now register the preferences for any non-dissector modules.
298 We must do that before we read the preferences as well. */
299 prefs_register_modules();
301 /* If invoked with the "-G" flag, we dump out a glossary of
302 display filter symbols.
304 We do this here to mirror what happens in the GTK+ version, although
305 it's not necessary here. */
306 if (argc >= 2 && strcmp(argv[1], "-G") == 0) {
307 proto_registrar_dump();
311 /* Set the C-language locale to the native environment. */
312 setlocale(LC_ALL, "");
314 prefs = read_prefs(&gpf_open_errno, &gpf_path, &pf_open_errno, &pf_path);
315 if (gpf_path != NULL) {
316 fprintf(stderr, "Can't open global preferences file \"%s\": %s.\n", pf_path,
317 strerror(gpf_open_errno));
319 if (pf_path != NULL) {
320 fprintf(stderr, "Can't open your preferences file \"%s\": %s.\n", pf_path,
321 strerror(pf_open_errno));
325 /* Load Wpcap, if possible */
329 /* Initialize the capture file struct */
331 cfile.plist_end = NULL;
333 cfile.filename = NULL;
334 cfile.user_saved = FALSE;
335 cfile.is_tempfile = FALSE;
337 cfile.dfilter = NULL;
340 cfile.cfilter = g_strdup("");
343 cfile.save_file = NULL;
344 cfile.save_file_fd = -1;
345 cfile.snap = WTAP_MAX_PACKET_SIZE;
348 cfile.autostop_duration = 0;
349 cfile.autostop_filesize = 0;
350 cfile.ringbuffer_on = FALSE;
351 cfile.ringbuffer_num_files = RINGBUFFER_MIN_NUM_FILES;
353 col_init(&cfile.cinfo, prefs->num_cols);
355 /* Assemble the compile-time options */
356 comp_info_str = g_string_new("");
358 g_string_append(comp_info_str, "with ");
359 g_string_sprintfa(comp_info_str,
360 #ifdef GLIB_MAJOR_VERSION
361 "GLib %d.%d.%d", GLIB_MAJOR_VERSION, GLIB_MINOR_VERSION,
364 "GLib (version unknown)");
368 g_string_append(comp_info_str, ", with libpcap ");
369 #ifdef HAVE_PCAP_VERSION
370 g_string_append(comp_info_str, pcap_version);
371 #else /* HAVE_PCAP_VERSION */
372 g_string_append(comp_info_str, "(version unknown)");
373 #endif /* HAVE_PCAP_VERSION */
374 #else /* HAVE_LIBPCAP */
375 g_string_append(comp_info_str, ", without libpcap");
376 #endif /* HAVE_LIBPCAP */
379 g_string_append(comp_info_str, ", with libz ");
381 g_string_append(comp_info_str, ZLIB_VERSION);
382 #else /* ZLIB_VERSION */
383 g_string_append(comp_info_str, "(version unknown)");
384 #endif /* ZLIB_VERSION */
385 #else /* HAVE_LIBZ */
386 g_string_append(comp_info_str, ", without libz");
387 #endif /* HAVE_LIBZ */
389 /* Oh, this is pretty */
390 #if defined(HAVE_UCD_SNMP_SNMP_H)
391 g_string_append(comp_info_str, ", with UCD SNMP ");
392 #ifdef HAVE_UCD_SNMP_VERSION_H
393 g_string_append(comp_info_str, VersionInfo);
394 #else /* HAVE_UCD_SNMP_VERSION_H */
395 g_string_append(comp_info_str, "(version unknown)");
396 #endif /* HAVE_UCD_SNMP_VERSION_H */
397 #elif defined(HAVE_SNMP_SNMP_H)
398 g_string_append(comp_info_str, ", with CMU SNMP ");
399 #ifdef HAVE_SNMP_VERSION_H
400 g_string_append(comp_info_str, snmp_Version());
401 #else /* HAVE_SNMP_VERSION_H */
402 g_string_append(comp_info_str, "(version unknown)");
403 #endif /* HAVE_SNMP_VERSION_H */
405 g_string_append(comp_info_str, ", without SNMP");
408 /* Now get our args */
409 while ((opt = getopt(argc, argv, "a:b:c:Df:F:hi:lnN:o:pr:R:s:t:vw:Vx")) != EOF) {
411 case 'a': /* autostop criteria */
413 if (set_autostop_criterion(optarg) == FALSE) {
414 fprintf(stderr, "ethereal: Invalid or unknown -a flag \"%s\"\n", optarg);
418 capture_option_specified = TRUE;
422 case 'b': /* Ringbuffer option */
424 cfile.ringbuffer_on = TRUE;
425 cfile.ringbuffer_num_files = get_positive_int(optarg, "number of ring buffer files");
427 capture_option_specified = TRUE;
431 case 'c': /* Capture xxx packets */
433 packet_count = get_positive_int(optarg, "packet count");
435 capture_option_specified = TRUE;
439 case 'D': /* Print a list of capture devices */
441 if_list = get_interface_list(&err, err_str);
442 if (if_list == NULL) {
445 case CANT_GET_INTERFACE_LIST:
446 fprintf(stderr, "tethereal: Can't get list of interfaces: %s\n",
450 case NO_INTERFACES_FOUND:
451 fprintf(stderr, "tethereal: There are no interfaces on which a capture can be done\n");
456 for (if_entry = g_list_first(if_list); if_entry != NULL;
457 if_entry = g_list_next(if_entry))
458 printf("%s\n", (char *)if_entry->data);
459 free_interface_list(if_list);
462 capture_option_specified = TRUE;
468 capture_filter_specified = TRUE;
469 cfile.cfilter = g_strdup(optarg);
471 capture_option_specified = TRUE;
476 out_file_type = wtap_short_string_to_file_type(optarg);
477 if (out_file_type < 0) {
478 fprintf(stderr, "tethereal: \"%s\" is not a valid capture file type\n",
483 case 'h': /* Print help and exit */
487 case 'i': /* Use interface xxx */
489 cfile.iface = g_strdup(optarg);
491 capture_option_specified = TRUE;
495 case 'l': /* "Line-buffer" standard output */
496 /* This isn't line-buffering, strictly speaking, it's just
497 flushing the standard output after the information for
498 each packet is printed; however, that should be good
499 enough for all the purposes to which "-l" is put.
501 See the comment in "wtap_dispatch_cb_print()" for an
502 explanation of why we do that, and why we don't just
503 use "setvbuf()" to make the standard output line-buffered
504 (short version: in Windows, "line-buffered" is the same
505 as "fully-buffered", and the output buffer is only flushed
506 when it fills up). */
507 line_buffered = TRUE;
509 case 'n': /* No name resolution */
510 prefs->name_resolve = PREFS_RESOLV_NONE;
512 case 'N': /* Select what types of addresses/port #s to resolve */
513 if (prefs->name_resolve == PREFS_RESOLV_ALL)
514 prefs->name_resolve = PREFS_RESOLV_NONE;
515 badopt = string_to_name_resolve(optarg, &prefs->name_resolve);
516 if (badopt != '\0') {
517 fprintf(stderr, "tethereal: -N specifies unknown resolving option '%c'; valid options are 'm', 'n', and 't'\n",
522 case 'o': /* Override preference from command line */
523 switch (prefs_set_pref(optarg)) {
525 case PREFS_SET_SYNTAX_ERR:
526 fprintf(stderr, "tethereal: Invalid -o flag \"%s\"\n", optarg);
530 case PREFS_SET_NO_SUCH_PREF:
531 case PREFS_SET_OBSOLETE:
532 fprintf(stderr, "tethereal: -o flag \"%s\" specifies unknown preference\n",
538 case 'p': /* Don't capture in promiscuous mode */
542 capture_option_specified = TRUE;
546 case 'r': /* Read capture file xxx */
547 cf_name = g_strdup(optarg);
549 case 'R': /* Read file filter */
552 case 's': /* Set the snapshot (capture) length */
554 cfile.snap = get_positive_int(optarg, "snapshot length");
556 capture_option_specified = TRUE;
560 case 't': /* Time stamp type */
561 if (strcmp(optarg, "r") == 0)
562 timestamp_type = RELATIVE;
563 else if (strcmp(optarg, "a") == 0)
564 timestamp_type = ABSOLUTE;
565 else if (strcmp(optarg, "ad") == 0)
566 timestamp_type = ABSOLUTE_WITH_DATE;
567 else if (strcmp(optarg, "d") == 0)
568 timestamp_type = DELTA;
570 fprintf(stderr, "tethereal: Invalid time stamp type \"%s\"\n",
572 fprintf(stderr, "It must be \"r\" for relative, \"a\" for absolute,\n");
573 fprintf(stderr, "\"ad\" for absolute with date, or \"d\" for delta.\n");
577 case 'v': /* Show version and exit */
578 printf("t%s %s, %s\n", PACKAGE, VERSION, comp_info_str->str);
581 case 'w': /* Write to capture file xxx */
582 cfile.save_file = g_strdup(optarg);
584 case 'V': /* Verbose */
587 case 'x': /* Print packet data in hex (and ASCII) */
593 /* If no capture filter or read filter has been specified, and there are
594 still command-line arguments, treat them as the tokens of a capture
595 filter (if no "-r" flag was specified) or a read filter (if a "-r"
596 flag was specified. */
598 if (cf_name != NULL) {
599 if (rfilter != NULL) {
601 "tethereal: Read filters were specified both with \"-R\" and with additional command-line arguments\n");
604 rfilter = get_args_as_string(argc, argv, optind);
607 if (capture_filter_specified) {
609 "tethereal: Capture filters were specified both with \"-f\" and with additional command-line arguments\n");
612 cfile.cfilter = get_args_as_string(argc, argv, optind);
614 capture_option_specified = TRUE;
619 /* If they didn't specify a "-w" flag, but specified a maximum capture
620 file size, tell them that this doesn't work, and exit. */
621 if (cfile.autostop_filesize != 0 && cfile.save_file == NULL) {
622 fprintf(stderr, "tethereal: Maximum capture file size specified, but capture isn't being saved to a file.\n");
626 if (cfile.ringbuffer_on) {
627 /* Ring buffer works only under certain conditions:
628 a) ring buffer does not work if you're not saving the capture to
630 b) it makes no sense to enable the ring buffer if the maximum
631 file size is set to "infinite". */
632 if (cfile.save_file == NULL) {
633 fprintf(stderr, "tethereal: Ring buffer requested, but capture isn't being saved to a file.\n");
636 if (cfile.autostop_filesize == 0) {
637 fprintf(stderr, "tethereal: Ring buffer requested, but no maximum capture file size was specified.\n");
643 /* Start windows sockets */
644 WSAStartup( MAKEWORD( 1, 1 ), &wsaData );
647 /* Notify all registered modules that have had any of their preferences
648 changed either from one of the preferences file or from the command
649 line that its preferences have changed. */
653 if (capture_option_specified)
654 fprintf(stderr, "This version of Tethereal was not built with support for capturing packets.\n");
659 /* Build the column format array */
660 for (i = 0; i < cfile.cinfo.num_cols; i++) {
661 cfile.cinfo.col_fmt[i] = get_column_format(i);
662 cfile.cinfo.col_title[i] = g_strdup(get_column_title(i));
663 cfile.cinfo.fmt_matx[i] = (gboolean *) g_malloc0(sizeof(gboolean) *
665 get_column_format_matches(cfile.cinfo.fmt_matx[i], cfile.cinfo.col_fmt[i]);
666 cfile.cinfo.col_data[i] = NULL;
667 if (cfile.cinfo.col_fmt[i] == COL_INFO)
668 cfile.cinfo.col_buf[i] = (gchar *) g_malloc(sizeof(gchar) * COL_MAX_INFO_LEN);
670 cfile.cinfo.col_buf[i] = (gchar *) g_malloc(sizeof(gchar) * COL_MAX_LEN);
674 cfile.snap = WTAP_MAX_PACKET_SIZE;
675 else if (cfile.snap < MIN_PACKET_SIZE)
676 cfile.snap = MIN_PACKET_SIZE;
678 /* Check the value range of the ringbuffer_num_files parameter */
679 if (cfile.ringbuffer_num_files < RINGBUFFER_MIN_NUM_FILES)
680 cfile.ringbuffer_num_files = RINGBUFFER_MIN_NUM_FILES;
681 else if (cfile.ringbuffer_num_files > RINGBUFFER_MAX_NUM_FILES)
682 cfile.ringbuffer_num_files = RINGBUFFER_MAX_NUM_FILES;
684 if (rfilter != NULL) {
685 if (!dfilter_compile(rfilter, &rfcode)) {
686 fprintf(stderr, "tethereal: %s\n", dfilter_error_msg);
691 cfile.rfcode = rfcode;
693 err = open_cap_file(cf_name, FALSE, &cfile);
698 err = load_cap_file(&cfile, out_file_type);
705 /* No capture file specified, so we're supposed to do a live capture;
706 do we have support for live captures? */
711 fprintf(stderr, "tethereal: Could not load wpcap.dll.\n");
716 /* Yes; did the user specify an interface to use? */
717 if (cfile.iface == NULL) {
718 /* No - pick the first one from the list of interfaces. */
719 if_list = get_interface_list(&err, err_str);
720 if (if_list == NULL) {
723 case CANT_GET_INTERFACE_LIST:
724 fprintf(stderr, "tethereal: Can't get list of interfaces: %s\n",
728 case NO_INTERFACES_FOUND:
729 fprintf(stderr, "tethereal: There are no interfaces on which a capture can be done\n");
734 cfile.iface = g_strdup(if_list->data); /* first interface */
735 free_interface_list(if_list);
737 capture(packet_count, out_file_type);
739 if (cfile.ringbuffer_on) {
744 fprintf(stderr, "This version of Tethereal was not built with support for capturing packets.\n");
755 /* Do the low-level work of a capture.
756 Returns TRUE if it succeeds, FALSE otherwise. */
758 capture(int packet_count, int out_file_type)
760 gchar open_err_str[PCAP_ERRBUF_SIZE];
761 gchar lookup_net_err_str[PCAP_ERRBUF_SIZE];
762 bpf_u_int32 netnum, netmask;
763 struct bpf_program fcode;
764 void (*oldhandler)(int);
767 condition *cnd_stop_capturesize;
768 condition *cnd_stop_timeout;
770 static const char ppamsg[] = "can't find PPA for ";
773 struct pcap_stat stats;
776 /* Initialize the table of conversations. */
777 epan_conversation_init();
779 /* Initialize protocol-specific variables */
780 init_all_protocols();
782 /* Initialize the common data structures for fragment reassembly.
783 Must be done *after* "init_all_protocols()", as "init_all_protocols()"
784 may free up space for fragments, which it finds by using the
785 data structures that "reassemble_init()" frees. */
788 ld.linktype = WTAP_ENCAP_UNKNOWN;
791 /* Open the network interface to capture from it.
792 Some versions of libpcap may put warnings into the error buffer
793 if they succeed; to tell if that's happened, we have to clear
794 the error buffer, and check if it's still a null string. */
795 open_err_str[0] = '\0';
796 ld.pch = pcap_open_live(cfile.iface, cfile.snap, promisc_mode, 1000,
799 if (ld.pch == NULL) {
800 /* Well, we couldn't start the capture. */
802 /* On Win32 OSes, the capture devices are probably available to all
803 users; don't warn about permissions problems.
805 Do, however, warn that Token Ring and PPP devices aren't supported. */
806 snprintf(errmsg, sizeof errmsg,
807 "The capture session could not be initiated (%s).\n"
808 "Please check that you have the proper interface specified.\n"
810 "Note that the driver Tethereal uses for packet capture on Windows\n"
811 "doesn't support capturing on Token Ring interfaces, and doesn't\n"
812 "support capturing on PPP/WAN interfaces in Windows NT/2000.\n",
815 /* If we got a "can't find PPA for XXX" message, warn the user (who
816 is running Ethereal on HP-UX) that they don't have a version
817 of libpcap that properly handles HP-UX (libpcap 0.6.x and later
818 versions, which properly handle HP-UX, say "can't find /dev/dlpi
819 PPA for XXX" rather than "can't find PPA for XXX"). */
820 if (strncmp(open_err_str, ppamsg, sizeof ppamsg - 1) == 0)
823 "You are running Tethereal with a version of the libpcap library\n"
824 "that doesn't handle HP-UX network devices well; this means that\n"
825 "Tethereal may not be able to capture packets.\n"
827 "To fix this, you should install libpcap 0.6.2, or a later version\n"
828 "of libpcap, rather than libpcap 0.4 or 0.5.x. It is available in\n"
829 "packaged binary form from the Software Porting And Archive Centre\n"
830 "for HP-UX; the Centre is at http://hpux.connect.org.uk/ - the page\n"
831 "at the URL lists a number of mirror sites.";
834 snprintf(errmsg, sizeof errmsg,
835 "The capture session could not be initiated (%s).\n"
836 "Please check to make sure you have sufficient permissions, and that\n"
837 "you have the proper interface specified.%s", open_err_str, libpcap_warn);
843 /* A capture filter was specified; set it up. */
844 if (pcap_lookupnet(cfile.iface, &netnum, &netmask, lookup_net_err_str) < 0) {
846 * Well, we can't get the netmask for this interface; it's used
847 * only for filters that check for broadcast IP addresses, so
848 * we just warn the user, and punt and use 0.
851 "Warning: Couldn't obtain netmask info (%s)\n.", lookup_net_err_str);
854 if (pcap_compile(ld.pch, &fcode, cfile.cfilter, 1, netmask) < 0) {
855 snprintf(errmsg, sizeof errmsg, "Unable to parse filter string (%s).",
856 pcap_geterr(ld.pch));
859 if (pcap_setfilter(ld.pch, &fcode) < 0) {
860 snprintf(errmsg, sizeof errmsg, "Can't install filter (%s).",
861 pcap_geterr(ld.pch));
866 ld.linktype = wtap_pcap_encap_to_wtap_encap(get_pcap_linktype(ld.pch,
868 if (cfile.save_file != NULL) {
869 /* Set up to write to the capture file. */
870 if (ld.linktype == WTAP_ENCAP_UNKNOWN) {
871 strcpy(errmsg, "The network you're capturing from is of a type"
872 " that Tethereal doesn't support.");
875 if (cfile.ringbuffer_on) {
876 cfile.save_file_fd = ringbuf_init(cfile.save_file,
877 cfile.ringbuffer_num_files);
878 if (cfile.save_file_fd != -1) {
879 ld.pdh = ringbuf_init_wtap_dump_fdopen(out_file_type, ld.linktype,
880 pcap_snapshot(ld.pch), &err);
885 ld.pdh = wtap_dump_open(cfile.save_file, out_file_type,
886 ld.linktype, pcap_snapshot(ld.pch), &err);
889 if (ld.pdh == NULL) {
890 snprintf(errmsg, sizeof errmsg, file_open_error_message(errno, TRUE),
896 /* Does "open_err_str" contain a non-empty string? If so, "pcap_open_live()"
897 returned a warning; print it, but keep capturing. */
898 if (open_err_str[0] != '\0')
899 fprintf(stderr, "tethereal: WARNING: %s.\n", open_err_str);
901 /* Catch SIGINT and SIGTERM and, if we get either of them, clean up
903 XXX - deal with signal semantics on various platforms. Or just
904 use "sigaction()" and be done with it? */
905 signal(SIGTERM, capture_cleanup);
906 signal(SIGINT, capture_cleanup);
908 if ((oldhandler = signal(SIGHUP, capture_cleanup)) != SIG_DFL)
909 signal(SIGHUP, oldhandler);
912 /* Let the user know what interface was chosen. */
913 fprintf(stderr, "Capturing on %s\n", cfile.iface);
916 /* initialize capture stop conditions */
917 init_capture_stop_conditions();
918 /* create stop conditions */
919 cnd_stop_capturesize = cnd_new((char*)CND_CLASS_CAPTURESIZE,
920 (long)cfile.autostop_filesize * 1000);
921 cnd_stop_timeout = cnd_new((char*)CND_CLASS_TIMEOUT,
922 (gint32)cfile.autostop_duration);
924 if (packet_count == 0)
925 packet_count = -1; /* infinite capturng */
928 if (packet_count > 0)
930 inpkts = pcap_dispatch(ld.pch, 1, capture_pcap_cb, (u_char *) &ld);
931 if (packet_count == 0) {
933 } else if (cnd_eval(cnd_stop_timeout) == TRUE) {
934 /* The specified capture time has elapsed; stop the capture. */
936 } else if (ld.pdh != NULL && (cnd_eval(cnd_stop_capturesize,
937 (guint32)wtap_get_bytes_dumped(ld.pdh))) == TRUE){
938 /* We're saving the capture to a file, and the capture file reached
940 if (cfile.ringbuffer_on) {
941 /* Switch to the next ringbuffer file */
942 if (ringbuf_switch_file(&cfile, &ld.pdh, &err) == TRUE) {
943 /* File switch failed: reset the condition */
944 cnd_reset(cnd_stop_capturesize);
946 /* File switch failed: stop here */
951 /* No ringbuffer - just stop. */
957 /* delete stop conditions */
958 cnd_delete(cnd_stop_capturesize);
959 cnd_delete(cnd_stop_timeout);
961 if (cfile.save_file != NULL) {
962 /* We're saving to a file, which means we're printing packet counts
963 to the standard output. Send a newline so that we move to the
964 line after the packet count. */
965 fprintf(stderr, "\n");
968 /* If we got an error while capturing, report it. */
970 fprintf(stderr, "tethereal: Error while capturing packets: %s\n",
971 pcap_geterr(ld.pch));
974 /* Get the capture statistics, and, if any packets were dropped, report
976 if (pcap_stats(ld.pch, &stats) >= 0) {
977 if (stats.ps_drop != 0) {
978 fprintf(stderr, "%u packets dropped\n", stats.ps_drop);
981 fprintf(stderr, "tethereal: Can't get packet-drop statistics: %s\n",
982 pcap_geterr(ld.pch));
987 if (cfile.save_file != NULL) {
988 /* We're saving to a file or files; close all files. */
989 if (cfile.ringbuffer_on) {
990 dump_ok = ringbuf_wtap_dump_close(&cfile, &err);
992 dump_ok = wtap_dump_close(ld.pdh, &err);
995 show_capture_file_io_error(cfile.save_file, err, TRUE);
1001 if (cfile.ringbuffer_on) {
1002 ringbuf_error_cleanup();
1004 g_free(cfile.save_file);
1005 cfile.save_file = NULL;
1006 fprintf(stderr, "tethereal: %s\n", errmsg);
1014 capture_pcap_cb(u_char *user, const struct pcap_pkthdr *phdr,
1017 struct wtap_pkthdr whdr;
1018 loop_data *ld = (loop_data *) user;
1021 whdr.ts.tv_sec = phdr->ts.tv_sec;
1022 whdr.ts.tv_usec = phdr->ts.tv_usec;
1023 whdr.caplen = phdr->caplen;
1024 whdr.len = phdr->len;
1025 whdr.pkt_encap = ld->linktype;
1030 wtap_dispatch_cb_write((u_char *)&args, &whdr, 0, NULL, pd);
1031 fprintf(stderr, "\r%u ", cfile.count);
1034 wtap_dispatch_cb_print((u_char *)&args, &whdr, 0, NULL, pd);
1039 capture_cleanup(int signum)
1041 /* Just set the loop flag to false. This will initiate
1042 a proper termination. */
1045 #endif /* HAVE_LIBPCAP */
1048 load_cap_file(capture_file *cf, int out_file_type)
1056 linktype = wtap_file_encap(cf->wth);
1057 if (cf->save_file != NULL) {
1058 /* Set up to write to the capture file. */
1059 pdh = wtap_dump_open(cf->save_file, out_file_type,
1060 linktype, wtap_snapshot_length(cf->wth), &err);
1063 /* We couldn't set up to write to the capture file. */
1066 case WTAP_ERR_UNSUPPORTED_FILE_TYPE:
1068 "tethereal: Capture files can't be written in that format.\n");
1071 case WTAP_ERR_UNSUPPORTED_ENCAP:
1072 case WTAP_ERR_ENCAP_PER_PACKET_UNSUPPORTED:
1074 "tethereal: The capture file being read cannot be written in that format.\n");
1077 case WTAP_ERR_CANT_OPEN:
1079 "tethereal: The file \"%s\" couldn't be created for some unknown reason.\n",
1083 case WTAP_ERR_SHORT_WRITE:
1085 "tethereal: A full header couldn't be written to the file \"%s\".\n",
1092 "tethereal: The file \"%s\" could not be opened: Error %d.\n",
1093 cf->save_file, err);
1096 "tethereal: The file \"%s\" could not be opened: %s\n.",
1097 cf->save_file, strerror(err));
1105 success = wtap_loop(cf->wth, 0, wtap_dispatch_cb_write, (u_char *) &args,
1108 /* Now close the capture file. */
1109 if (!wtap_dump_close(pdh, &err))
1110 show_capture_file_io_error(cfile.save_file, err, TRUE);
1114 success = wtap_loop(cf->wth, 0, wtap_dispatch_cb_print, (u_char *) &args,
1118 /* Print up a message box noting that the read failed somewhere along
1122 case WTAP_ERR_UNSUPPORTED_ENCAP:
1124 "tethereal: \"%s\" is a capture file is for a network type that Tethereal doesn't support.\n",
1128 case WTAP_ERR_CANT_READ:
1130 "tethereal: An attempt to read from \"%s\" failed for some unknown reason.\n",
1134 case WTAP_ERR_SHORT_READ:
1136 "tethereal: \"%s\" appears to have been cut short in the middle of a packet.\n",
1140 case WTAP_ERR_BAD_RECORD:
1142 "tethereal: \"%s\" appears to be damaged or corrupt.\n",
1148 "tethereal: An error occurred while reading \"%s\": %s.\n",
1149 cf->filename, wtap_strerror(err));
1155 wtap_close(cf->wth);
1162 fill_in_fdata(frame_data *fdata, capture_file *cf,
1163 const struct wtap_pkthdr *phdr,
1164 const union wtap_pseudo_header *pseudo_header, long offset)
1171 fdata->data_src = NULL;
1172 fdata->num = cf->count;
1173 fdata->pkt_len = phdr->len;
1174 fdata->cap_len = phdr->caplen;
1175 fdata->file_off = offset;
1176 fdata->lnk_t = phdr->pkt_encap;
1177 fdata->abs_secs = phdr->ts.tv_sec;
1178 fdata->abs_usecs = phdr->ts.tv_usec;
1179 fdata->flags.passed_dfilter = 0;
1180 fdata->flags.encoding = CHAR_ASCII;
1181 fdata->flags.visited = 0;
1182 fdata->flags.marked = 0;
1184 /* If we don't have the time stamp of the first packet in the
1185 capture, it's because this is the first packet. Save the time
1186 stamp of this packet as the time stamp of the first packet. */
1187 if (!firstsec && !firstusec) {
1188 firstsec = fdata->abs_secs;
1189 firstusec = fdata->abs_usecs;
1192 /* If we don't have the time stamp of the previous displayed packet,
1193 it's because this is the first displayed packet. Save the time
1194 stamp of this packet as the time stamp of the previous displayed
1196 if (!prevsec && !prevusec) {
1197 prevsec = fdata->abs_secs;
1198 prevusec = fdata->abs_usecs;
1201 /* Get the time elapsed between the first packet and this packet. */
1202 compute_timestamp_diff(&fdata->rel_secs, &fdata->rel_usecs,
1203 fdata->abs_secs, fdata->abs_usecs, firstsec, firstusec);
1205 /* If it's greater than the current elapsed time, set the elapsed time
1206 to it (we check for "greater than" so as not to be confused by
1207 time moving backwards). */
1208 if ((gint32)cf->esec < fdata->rel_secs
1209 || ((gint32)cf->esec == fdata->rel_secs && (gint32)cf->eusec < fdata->rel_usecs)) {
1210 cf->esec = fdata->rel_secs;
1211 cf->eusec = fdata->rel_usecs;
1214 /* Get the time elapsed between the previous displayed packet and
1216 compute_timestamp_diff(&fdata->del_secs, &fdata->del_usecs,
1217 fdata->abs_secs, fdata->abs_usecs, prevsec, prevusec);
1218 prevsec = fdata->abs_secs;
1219 prevusec = fdata->abs_usecs;
1222 /* Free up all data attached to a "frame_data" structure. */
1224 clear_fdata(frame_data *fdata)
1227 g_slist_free(fdata->pfd);
1228 if (fdata->data_src)
1229 g_slist_free(fdata->data_src);
1233 wtap_dispatch_cb_write(u_char *user, const struct wtap_pkthdr *phdr,
1234 long offset, union wtap_pseudo_header *pseudo_header, const u_char *buf)
1236 cb_args_t *args = (cb_args_t *) user;
1237 capture_file *cf = args->cf;
1238 wtap_dumper *pdh = args->pdh;
1242 epan_dissect_t *edt;
1246 fill_in_fdata(&fdata, cf, phdr, pseudo_header, offset);
1247 edt = epan_dissect_new(TRUE, FALSE);
1248 epan_dissect_prime_dfilter(edt, cf->rfcode);
1249 epan_dissect_run(edt, pseudo_header, buf, &fdata, NULL);
1250 passed = dfilter_apply_edt(cf->rfcode, edt);
1256 if (!wtap_dump(pdh, phdr, pseudo_header, buf, &err)) {
1258 if (ld.pch != NULL) {
1259 /* We're capturing packets, so we're printing a count of packets
1260 captured; move to the line after the count. */
1261 fprintf(stderr, "\n");
1264 show_capture_file_io_error(cf->save_file, err, FALSE);
1269 wtap_dump_close(pdh, &err);
1274 epan_dissect_free(edt);
1276 clear_fdata(&fdata);
1280 show_capture_file_io_error(const char *fname, int err, gboolean is_close)
1286 "tethereal: Not all the packets could be written to \"%s\" because there is "
1287 "no space left on the file system.\n",
1294 "tethereal: Not all the packets could be written to \"%s\" because you are "
1295 "too close to, or over your disk quota.\n",
1300 case WTAP_ERR_CANT_CLOSE:
1302 "tethereal: \"%s\" couldn't be closed for some unknown reason.\n",
1306 case WTAP_ERR_SHORT_WRITE:
1308 "tethereal: Not all the packets could be written to \"%s\".\n",
1315 "tethereal: \"%s\" could not be closed: %s.\n",
1316 fname, wtap_strerror(err));
1319 "tethereal: An error occurred while writing to \"%s\": %s.\n",
1320 fname, wtap_strerror(err));
1327 wtap_dispatch_cb_print(u_char *user, const struct wtap_pkthdr *phdr,
1328 long offset, union wtap_pseudo_header *pseudo_header, const u_char *buf)
1330 cb_args_t *args = (cb_args_t *) user;
1331 capture_file *cf = args->cf;
1334 print_args_t print_args;
1335 epan_dissect_t *edt;
1336 gboolean create_proto_tree;
1341 fill_in_fdata(&fdata, cf, phdr, pseudo_header, offset);
1344 if (cf->rfcode || verbose)
1345 create_proto_tree = TRUE;
1347 create_proto_tree = FALSE;
1348 /* The protocol tree will be "visible", i.e., printed, only if we're
1349 not printing a summary.
1351 We only need the columns if we're *not* verbose; in verbose mode,
1352 we print the protocol tree, not the protocol summary. */
1353 edt = epan_dissect_new(create_proto_tree, verbose);
1355 epan_dissect_prime_dfilter(edt, cf->rfcode);
1357 epan_dissect_run(edt, pseudo_header, buf, &fdata, verbose ? NULL : &cf->cinfo);
1359 passed = dfilter_apply_edt(cf->rfcode, edt);
1362 /* The packet passed the read filter. */
1364 /* Print the information in the protocol tree. */
1365 print_args.to_file = TRUE;
1366 print_args.format = PR_FMT_TEXT;
1367 print_args.print_summary = FALSE;
1368 print_args.print_hex = print_hex;
1369 print_args.expand_all = TRUE;
1370 print_args.suppress_unmarked = FALSE;
1371 proto_tree_print(FALSE, &print_args, (GNode *)edt->tree,
1374 /* "print_hex_data()" will put out a leading blank line, as well
1375 as a trailing one; print one here, to separate the packets,
1376 only if "print_hex_data()" won't be called. */
1380 /* Just fill in the columns. */
1381 epan_dissect_fill_in_columns(edt);
1383 /* Now print them. */
1384 for (i = 0; i < cf->cinfo.num_cols; i++) {
1385 switch (cf->cinfo.col_fmt[i]) {
1388 * Don't print this if we're doing a live capture from a network
1389 * interface - if we're doing a live capture, you won't be
1390 * able to look at the capture in the future (it's not being
1391 * saved anywhere), so the frame numbers are unlikely to be
1394 * (XXX - it might be nice to be able to save and print at
1395 * the same time, sort of like an "Update list of packets
1396 * in real time" capture in Ethereal.)
1398 if (cf->iface != NULL)
1400 printf("%3s", cf->cinfo.col_data[i]);
1406 case COL_ABS_DATE_TIME: /* XXX - wider */
1407 printf("%10s", cf->cinfo.col_data[i]);
1413 case COL_DEF_DL_SRC:
1414 case COL_RES_DL_SRC:
1415 case COL_UNRES_DL_SRC:
1416 case COL_DEF_NET_SRC:
1417 case COL_RES_NET_SRC:
1418 case COL_UNRES_NET_SRC:
1419 printf("%12s", cf->cinfo.col_data[i]);
1425 case COL_DEF_DL_DST:
1426 case COL_RES_DL_DST:
1427 case COL_UNRES_DL_DST:
1428 case COL_DEF_NET_DST:
1429 case COL_RES_NET_DST:
1430 case COL_UNRES_NET_DST:
1431 printf("%-12s", cf->cinfo.col_data[i]);
1435 printf("%s", cf->cinfo.col_data[i]);
1438 if (i != cf->cinfo.num_cols - 1) {
1440 * This isn't the last column, so we need to print a
1441 * separator between this column and the next.
1443 * If we printed a network source and are printing a
1444 * network destination of the same type next, separate
1445 * them with "->"; if we printed a network destination
1446 * and are printing a network source of the same type
1447 * next, separate them with "<-"; otherwise separate them
1450 switch (cf->cinfo.col_fmt[i]) {
1455 switch (cf->cinfo.col_fmt[i + 1]) {
1469 case COL_DEF_DL_SRC:
1470 case COL_RES_DL_SRC:
1471 case COL_UNRES_DL_SRC:
1472 switch (cf->cinfo.col_fmt[i + 1]) {
1474 case COL_DEF_DL_DST:
1475 case COL_RES_DL_DST:
1476 case COL_UNRES_DL_DST:
1486 case COL_DEF_NET_SRC:
1487 case COL_RES_NET_SRC:
1488 case COL_UNRES_NET_SRC:
1489 switch (cf->cinfo.col_fmt[i + 1]) {
1491 case COL_DEF_NET_DST:
1492 case COL_RES_NET_DST:
1493 case COL_UNRES_NET_DST:
1506 switch (cf->cinfo.col_fmt[i + 1]) {
1520 case COL_DEF_DL_DST:
1521 case COL_RES_DL_DST:
1522 case COL_UNRES_DL_DST:
1523 switch (cf->cinfo.col_fmt[i + 1]) {
1525 case COL_DEF_DL_SRC:
1526 case COL_RES_DL_SRC:
1527 case COL_UNRES_DL_SRC:
1537 case COL_DEF_NET_DST:
1538 case COL_RES_NET_DST:
1539 case COL_UNRES_NET_DST:
1540 switch (cf->cinfo.col_fmt[i + 1]) {
1542 case COL_DEF_NET_SRC:
1543 case COL_RES_NET_SRC:
1544 case COL_UNRES_NET_SRC:
1563 print_hex_data(stdout, print_args.format, &fdata);
1568 /* The ANSI C standard does not appear to *require* that a line-buffered
1569 stream be flushed to the host environment whenever a newline is
1570 written, it just says that, on such a stream, characters "are
1571 intended to be transmitted to or from the host environment as a
1572 block when a new-line character is encountered".
1574 The Visual C++ 6.0 C implementation doesn't do what is intended;
1575 even if you set a stream to be line-buffered, it still doesn't
1576 flush the buffer at the end of every line.
1578 So, if the "-l" flag was specified, we flush the standard output
1579 at the end of a packet. This will do the right thing if we're
1580 printing packet summary lines, and, as we print the entire protocol
1581 tree for a single packet without waiting for anything to happen,
1582 it should be as good as line-buffered mode if we're printing
1583 protocol trees. (The whole reason for the "-l" flag in either
1584 tcpdump or Tethereal is to allow the output of a live capture to
1585 be piped to a program or script and to have that script see the
1586 information for the packet as soon as it's printed, rather than
1587 having to wait until a standard I/O buffer fills up. */
1591 epan_dissect_free(edt);
1593 clear_fdata(&fdata);
1597 file_open_error_message(int err, gboolean for_writing)
1600 static char errmsg_errno[1024+1];
1604 case WTAP_ERR_NOT_REGULAR_FILE:
1605 errmsg = "The file \"%s\" is a \"special file\" or socket or other non-regular file.";
1608 case WTAP_ERR_FILE_UNKNOWN_FORMAT:
1609 case WTAP_ERR_UNSUPPORTED:
1610 /* Seen only when opening a capture file for reading. */
1611 errmsg = "The file \"%s\" is not a capture file in a format Tethereal understands.";
1614 case WTAP_ERR_UNSUPPORTED_FILE_TYPE:
1615 /* Seen only when opening a capture file for writing. */
1616 errmsg = "Tethereal does not support writing capture files in that format.";
1619 case WTAP_ERR_UNSUPPORTED_ENCAP:
1620 case WTAP_ERR_ENCAP_PER_PACKET_UNSUPPORTED:
1622 errmsg = "Tethereal cannot save this capture in that format.";
1624 errmsg = "The file \"%s\" is a capture for a network type that Tethereal doesn't support.";
1627 case WTAP_ERR_BAD_RECORD:
1628 errmsg = "The file \"%s\" appears to be damaged or corrupt.";
1631 case WTAP_ERR_CANT_OPEN:
1633 errmsg = "The file \"%s\" could not be created for some unknown reason.";
1635 errmsg = "The file \"%s\" could not be opened for some unknown reason.";
1638 case WTAP_ERR_SHORT_READ:
1639 errmsg = "The file \"%s\" appears to have been cut short"
1640 " in the middle of a packet or other data.";
1643 case WTAP_ERR_SHORT_WRITE:
1644 errmsg = "A full header couldn't be written to the file \"%s\".";
1649 errmsg = "The path to the file \"%s\" does not exist.";
1651 errmsg = "The file \"%s\" does not exist.";
1656 errmsg = "You do not have permission to create or write to the file \"%s\".";
1658 errmsg = "You do not have permission to read the file \"%s\".";
1662 errmsg = "\"%s\" is a directory (folder), not a file.";
1666 snprintf(errmsg_errno, sizeof(errmsg_errno),
1667 "The file \"%%s\" could not be opened: %s.",
1668 wtap_strerror(err));
1669 errmsg = errmsg_errno;
1676 open_cap_file(char *fname, gboolean is_tempfile, capture_file *cf)
1681 struct stat cf_stat;
1682 char err_msg[2048+1];
1684 wth = wtap_open_offline(fname, &err, FALSE);
1688 /* Find the size of the file. */
1690 if (fstat(fd, &cf_stat) < 0) {
1696 /* The open succeeded. Fill in the information for this file. */
1698 /* Initialize the table of conversations. */
1699 epan_conversation_init();
1701 /* Initialize protocol-specific variables */
1702 init_all_protocols();
1704 /* Initialize the common data structures for fragment reassembly.
1705 Must be done *after* "init_all_protocols()", as "init_all_protocols()"
1706 may free up space for fragments, which it finds by using the
1707 data structures that "reassemble_init()" frees. */
1712 cf->f_len = cf_stat.st_size;
1714 /* Set the file name because we need it to set the follow stream filter.
1715 XXX - is that still true? We need it for other reasons, though,
1717 cf->filename = g_strdup(fname);
1719 /* Indicate whether it's a permanent or temporary file. */
1720 cf->is_tempfile = is_tempfile;
1722 /* If it's a temporary capture buffer file, mark it as not saved. */
1723 cf->user_saved = !is_tempfile;
1725 cf->cd_t = wtap_file_type(cf->wth);
1727 cf->drops_known = FALSE;
1731 cf->snap = wtap_snapshot_length(cf->wth);
1732 cf->progbar_quantum = 0;
1733 cf->progbar_nextstep = 0;
1734 firstsec = 0, firstusec = 0;
1735 prevsec = 0, prevusec = 0;
1740 snprintf(err_msg, sizeof err_msg, file_open_error_message(err, FALSE), fname);
1741 fprintf(stderr, "tethereal: %s\n", err_msg);