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.
50 #ifdef HAVE_SYS_STAT_H
51 # include <sys/stat.h>
54 #ifdef NEED_STRERROR_H
63 #include <epan/epan.h>
64 #include <epan/filesystem.h>
67 #include <epan/timestamp.h>
68 #include <epan/packet.h>
70 #include "disabled_protos.h"
71 #include <epan/prefs.h>
72 #include <epan/column.h>
74 #include <epan/addr_resolv.h>
76 #include "clopts_common.h"
77 #include "version_info.h"
78 #include <epan/conversation.h>
79 #include <epan/plugins.h>
81 #include "conditions.h"
82 #include "capture_stop_conditions.h"
83 #include "ringbuffer.h"
84 #include "capture_ui_utils.h"
85 #include <epan/epan_dissect.h>
87 #include <epan/stat_cmd_args.h>
88 #include <epan/timestamp.h>
93 #include "pcap-util.h"
94 #include <wiretap/wtap-capture.h>
95 #include <wiretap/libpcap.h>
97 #include "capture-wpcap.h"
98 #include "capture_errs.h"
101 #endif /* HAVE_LIBPCAP */
102 #include "epan/emem.h"
105 * This is the template for the decode as option; it is shared between the
106 * various functions that output the usage for this parameter.
108 static const gchar decode_as_arg_template[] = "<layer_type>==<selector>,<decode_as_protocol>";
110 static nstime_t first_ts;
111 static nstime_t prev_ts;
112 static GString *comp_info_str, *runtime_info_str;
114 static gboolean print_packet_info; /* TRUE if we're to print packet information */
116 * The way the packet decode is to be written.
119 WRITE_TEXT, /* summary or detail text */
120 WRITE_XML /* PDML or PSML */
121 /* Add CSV and the like here */
123 static output_action_e output_action;
124 static gboolean do_dissection; /* TRUE if we have to dissect each packet */
125 static gboolean verbose;
126 static gboolean print_hex;
127 static gboolean line_buffered;
128 static guint32 cum_bytes = 0;
129 static print_format_e print_format = PR_FMT_TEXT;
130 static print_stream_t *print_stream;
134 * TRUE if we're to print packet counts to keep track of captured packets.
136 static gboolean print_packet_counts;
138 typedef struct _loop_data {
139 gboolean go; /* TRUE as long as we're supposed to keep capturing */
141 gboolean from_pipe; /* TRUE if we are capturing data from a pipe */
143 char *save_file; /* Name of file to which we're writing */
146 gboolean output_to_pipe;
149 gboolean modified; /* TRUE if data in the pipe uses modified pcap headers */
150 gboolean byte_swapped; /* TRUE if data in the pipe is byte swapped */
151 unsigned int bytes_to_read, bytes_read; /* Used by pipe_dispatch */
153 STATE_EXPECT_REC_HDR, STATE_READ_REC_HDR,
154 STATE_EXPECT_DATA, STATE_READ_DATA
156 enum { PIPOK, PIPEOF, PIPERR, PIPNEXIST } pipe_err;
163 static capture_options capture_opts;
167 static gboolean infodelay; /* if TRUE, don't print capture info in SIGINFO handler */
168 static gboolean infoprint; /* if TRUE, print capture info after clearing infodelay */
170 #endif /* HAVE_LIBPCAP */
173 static int capture(char *, int);
174 static void capture_pcap_cb(u_char *, const struct pcap_pkthdr *,
176 static void report_counts(void);
178 static BOOL WINAPI capture_cleanup(DWORD);
180 static void capture_cleanup(int);
182 static void report_counts_siginfo(int);
185 #endif /* HAVE_LIBPCAP */
187 static int load_cap_file(capture_file *, char *, int);
188 static gboolean process_packet(capture_file *cf, wtap_dumper *pdh, long offset,
189 const struct wtap_pkthdr *whdr, union wtap_pseudo_header *pseudo_header,
190 const guchar *pd, int *err);
191 static void show_capture_file_io_error(const char *, int, gboolean);
192 static void show_print_file_io_error(int err);
193 static gboolean write_preamble(capture_file *cf);
194 static gboolean print_packet(capture_file *cf, epan_dissect_t *edt);
195 static gboolean write_finale(void);
196 static const char *cf_open_error_message(int err, gchar *err_info,
197 gboolean for_writing, int file_type);
200 static void adjust_header(loop_data *, struct pcap_hdr *, struct pcaprec_hdr *);
201 static int pipe_open_live(char *, struct pcap_hdr *, loop_data *, char *, int);
202 static int pipe_dispatch(int, loop_data *, struct pcap_hdr *, \
203 struct pcaprec_modified_hdr *, guchar *, char *, int);
207 static void open_failure_message(const char *filename, int err,
208 gboolean for_writing);
209 static void failure_message(const char *msg_format, va_list ap);
210 static void read_failure_message(const char *filename, int err);
216 print_usage(gboolean print_ver)
223 fprintf(output, "This is t" PACKAGE " " VERSION "%s"
224 "\n (C) 1998-2005 Gerald Combs <gerald@ethereal.com>"
227 svnversion, comp_info_str->str, runtime_info_str->str);
232 fprintf(output, "\nt%s [ -vh ] [ -DlLnpqSVx ] [ -a <capture autostop condition> ] ...\n",
234 fprintf(output, "\t[ -b <capture ring buffer option> ] ... [ -c <capture packet count> ]\n");
235 fprintf(output, "\t[ -d %s ] ...\n", decode_as_arg_template);
236 fprintf(output, "\t[ -f <capture filter> ] [ -F <output file type> ]\n");
237 fprintf(output, "\t[ -i <capture interface> ] [ -N <name resolving flags> ]\n");
238 fprintf(output, "\t[ -o <preference setting> ] ... [ -r <infile> ]\n");
239 fprintf(output, "\t[ -R <read (display) filter> ] [ -s <capture snaplen> ]\n");
240 fprintf(output, "\t[ -t <time stamp format> ] [ -T pdml|ps|psml|text ]\n");
241 fprintf(output, "\t[ -w <savefile> ] [ -y <capture link type> ] [ -z <statistics> ]\n");
243 fprintf(output, "\nt%s [ -vh ] [ -lnVx ]\n", PACKAGE);
244 fprintf(output, "\t[ -d %s ] ...\n", decode_as_arg_template);
245 fprintf(output, "\t[ -F <output file type> ] [ -N <name resolving flags> ]\n");
246 fprintf(output, "\t[ -o <preference setting> ] ... [ -r <infile> ]\n");
247 fprintf(output, "\t[ -R <read (display) filter> ] \t[ -t <time stamp format> ]\n");
248 fprintf(output, "\t[ -T pdml|ps|psml|text ] [ -w <savefile> ] [ -z <statistics ]\n");
250 fprintf(output, "Valid file type arguments to the \"-F\" flag:\n");
251 for (i = 0; i < WTAP_NUM_FILE_TYPES; i++) {
252 if (wtap_dump_can_open(i))
253 fprintf(output, "\t%s - %s\n",
254 wtap_file_type_short_string(i), wtap_file_type_string(i));
256 fprintf(output, "\tdefault is libpcap\n");
260 * For a dissector table, print on the stream described by output,
261 * its short name (which is what's used in the "-d" option) and its
265 display_dissector_table_names(char *table_name, const char *ui_name,
268 fprintf((FILE *)output, "\t%s (%s)\n", table_name, ui_name);
272 * For a dissector handle, print on the stream described by output,
273 * the filter name (which is what's used in the "-d" option) and the full
274 * name for the protocol that corresponds to this handle.
277 display_dissector_names(const gchar *table _U_, gpointer handle, gpointer output)
280 const gchar* proto_filter_name;
281 const gchar* proto_ui_name;
283 proto_id = dissector_handle_get_protocol_index((dissector_handle_t)handle);
285 if (proto_id != -1) {
286 proto_filter_name = proto_get_protocol_filter_name(proto_id);
287 proto_ui_name = proto_get_protocol_name(proto_id);
288 g_assert(proto_filter_name != NULL);
289 g_assert(proto_ui_name != NULL);
291 fprintf((FILE *)output, "\t%s (%s)\n",
298 * The protocol_name_search structure is used by find_protocol_name_func()
299 * to pass parameters and store results
301 struct protocol_name_search{
302 gchar *searched_name; /* Protocol filter name we are looking for */
303 dissector_handle_t matched_handle; /* Handle for a dissector whose protocol has the specified filter name */
304 guint nb_match; /* How many dissectors matched searched_name */
306 typedef struct protocol_name_search *protocol_name_search_t;
309 * This function parses all dissectors associated with a table to find the
310 * one whose protocol has the specified filter name. It is called
311 * as a reference function in a call to dissector_table_foreach_handle.
312 * The name we are looking for, as well as the results, are stored in the
313 * protocol_name_search struct pointed to by user_data.
314 * If called using dissector_table_foreach_handle, we actually parse the
315 * whole list of dissectors.
318 find_protocol_name_func(const gchar *table _U_, gpointer handle, gpointer user_data)
322 const gchar *protocol_filter_name;
323 protocol_name_search_t search_info;
327 search_info = (protocol_name_search_t)user_data;
329 proto_id = dissector_handle_get_protocol_index((dissector_handle_t)handle);
330 if (proto_id != -1) {
331 protocol_filter_name = proto_get_protocol_filter_name(proto_id);
332 g_assert(protocol_filter_name != NULL);
333 if (strcmp(protocol_filter_name, search_info->searched_name) == 0) {
335 if (search_info->nb_match == 0) {
336 /* Record this handle only if this is the first match */
337 search_info->matched_handle = (dissector_handle_t)handle; /* Record the handle for this matching dissector */
339 search_info->nb_match++;
345 * Print all layer type names supported.
346 * We send the output to the stream described by the handle output.
350 fprint_all_layer_types(FILE *output)
353 dissector_all_tables_foreach_table(display_dissector_table_names, (gpointer)output);
357 * Print all protocol names supported for a specific layer type.
358 * table_name contains the layer type name in which the search is performed.
359 * We send the output to the stream described by the handle output.
363 fprint_all_protocols_for_layer_types(FILE *output, gchar *table_name)
366 dissector_table_foreach_handle(table_name,
367 display_dissector_names,
372 * The function below parses the command-line parameters for the decode as
373 * feature (a string pointer by cl_param).
374 * It checks the format of the command-line, searches for a matching table
375 * and dissector. If a table/dissector match is not found, we display a
376 * summary of the available tables/dissectors (on stderr) and return FALSE.
377 * If everything is fine, we get the "Decode as" preference activated,
378 * then we return TRUE.
381 add_decode_as(const gchar *cl_param)
385 gchar *decoded_param;
386 gchar *remaining_param;
388 gchar *dissector_str;
389 dissector_handle_t dissector_matching;
390 dissector_table_t table_matching;
391 ftenum_t dissector_table_selector_type;
392 struct protocol_name_search user_protocol_name;
394 /* The following code will allocate and copy the command-line options in a string pointed by decoded_param */
397 decoded_param = g_malloc( sizeof(gchar) * (strlen(cl_param) + 1) ); /* Allocate enough space to have a working copy of the command-line parameter */
398 g_assert(decoded_param);
399 strcpy(decoded_param, cl_param);
402 /* The lines below will parse this string (modifying it) to extract all
403 necessary information. Note that decoded_param is still needed since
404 strings are not copied - we just save pointers. */
406 /* This section extracts a layer type (table_name) from decoded_param */
407 table_name = decoded_param; /* Layer type string starts from beginning */
409 remaining_param = strchr(table_name, '=');
410 if (remaining_param == NULL) {
411 fprintf(stderr, "tethereal: Parameter \"%s\" doesn't follow the template \"%s\"\n", cl_param, decode_as_arg_template);
412 /* If the argument does not follow the template, carry on anyway to check
413 if the table name is at least correct. If remaining_param is NULL,
414 we'll exit anyway further down */
417 *remaining_param = '\0'; /* Terminate the layer type string (table_name) where '=' was detected */
420 /* Remove leading and trailing spaces from the table name */
421 while ( table_name[0] == ' ' )
423 while ( table_name[strlen(table_name) - 1] == ' ' )
424 table_name[strlen(table_name) - 1] = '\0'; /* Note: if empty string, while loop will eventually exit */
426 /* The following part searches a table matching with the layer type specified */
427 table_matching = NULL;
429 /* Look for the requested table */
430 if ( !(*(table_name)) ) { /* Is the table name empty, if so, don't even search for anything, display a message */
431 fprintf(stderr, "tethereal: No layer type specified\n"); /* Note, we don't exit here, but table_matching will remain NULL, so we exit below */
434 table_matching = find_dissector_table(table_name);
435 if (!table_matching) {
436 fprintf(stderr, "tethereal: Unknown layer type -- %s\n", table_name); /* Note, we don't exit here, but table_matching will remain NULL, so we exit below */
440 if (!table_matching) {
441 /* Display a list of supported layer types to help the user, if the
442 specified layer type was not found */
443 fprintf(stderr, "tethereal: Valid layer types are:\n");
444 fprint_all_layer_types(stderr);
446 if (remaining_param == NULL || !table_matching) {
447 /* Exit if the layer type was not found, or if no '=' separator was found
449 g_free(decoded_param);
453 if (*(remaining_param + 1) != '=') { /* Check for "==" and not only '=' */
454 fprintf(stderr, "tethereal: WARNING: -d requires \"==\" instead of \"=\". Option will be treated as \"%s==%s\"\n", table_name, remaining_param + 1);
457 remaining_param++; /* Move to the second '=' */
458 *remaining_param = '\0'; /* Remove the second '=' */
460 remaining_param++; /* Position after the layer type string */
462 /* This section extracts a selector value (selector_str) from decoded_param */
464 selector_str = remaining_param; /* Next part starts with the selector number */
466 remaining_param = strchr(selector_str, ',');
467 if (remaining_param == NULL) {
468 fprintf(stderr, "tethereal: Parameter \"%s\" doesn't follow the template \"%s\"\n", cl_param, decode_as_arg_template);
469 /* If the argument does not follow the template, carry on anyway to check
470 if the selector value is at least correct. If remaining_param is NULL,
471 we'll exit anyway further down */
474 *remaining_param = '\0'; /* Terminate the selector number string (selector_str) where ',' was detected */
477 dissector_table_selector_type = get_dissector_table_selector_type(table_name);
479 switch (dissector_table_selector_type) {
485 /* The selector for this table is an unsigned number. Parse it as such.
486 There's no need to remove leading and trailing spaces from the
487 selector number string, because sscanf will do that for us. */
488 if ( sscanf(selector_str, "%u", &selector) != 1 ) {
489 fprintf(stderr, "tethereal: Invalid selector number \"%s\"\n", selector_str);
490 g_free(decoded_param);
497 /* The selector for this table is a string. */
501 /* There are currently no dissector tables with any types other
502 than the ones listed above. */
503 g_assert_not_reached();
506 if (remaining_param == NULL) {
507 /* Exit if no ',' separator was found (see above) */
508 fprintf(stderr, "tethereal: Valid protocols for layer type \"%s\" are:\n", table_name);
509 fprint_all_protocols_for_layer_types(stderr, table_name);
510 g_free(decoded_param);
514 remaining_param++; /* Position after the selector number string */
516 /* This section extracts a protocol filter name (dissector_str) from decoded_param */
518 dissector_str = remaining_param; /* All the rest of the string is the dissector (decode as protocol) name */
520 /* Remove leading and trailing spaces from the dissector name */
521 while ( dissector_str[0] == ' ' )
523 while ( dissector_str[strlen(dissector_str) - 1] == ' ' )
524 dissector_str[strlen(dissector_str) - 1] = '\0'; /* Note: if empty string, while loop will eventually exit */
526 dissector_matching = NULL;
528 /* We now have a pointer to the handle for the requested table inside the variable table_matching */
529 if ( ! (*dissector_str) ) { /* Is the dissector name empty, if so, don't even search for a matching dissector and display all dissectors found for the selected table */
530 fprintf(stderr, "tethereal: No protocol name specified\n"); /* Note, we don't exit here, but dissector_matching will remain NULL, so we exit below */
533 user_protocol_name.nb_match = 0;
534 user_protocol_name.searched_name = dissector_str;
535 user_protocol_name.matched_handle = NULL;
537 dissector_table_foreach_handle(table_name, find_protocol_name_func, &user_protocol_name); /* Go and perform the search for this dissector in the this table's dissectors' names and shortnames */
539 if (user_protocol_name.nb_match != 0) {
540 dissector_matching = user_protocol_name.matched_handle;
541 if (user_protocol_name.nb_match > 1) {
542 fprintf(stderr, "tethereal: WARNING: Protocol \"%s\" matched %u dissectors, first one will be used\n", dissector_str, user_protocol_name.nb_match);
546 /* OK, check whether the problem is that there isn't any such
547 protocol, or that there is but it's not specified as a protocol
548 that's valid for that dissector table.
549 Note, we don't exit here, but dissector_matching will remain NULL,
551 if (proto_get_id_by_filter_name(dissector_str) == -1) {
552 /* No such protocol */
553 fprintf(stderr, "tethereal: Unknown protocol -- \"%s\"\n", dissector_str);
555 fprintf(stderr, "tethereal: Protocol \"%s\" isn't valid for layer type \"%s\"\n",
556 dissector_str, table_name);
561 if (!dissector_matching) {
562 fprintf(stderr, "tethereal: Valid protocols for layer type \"%s\" are:\n", table_name);
563 fprint_all_protocols_for_layer_types(stderr, table_name);
564 g_free(decoded_param);
568 /* This is the end of the code that parses the command-line options.
569 All information is now stored in the variables:
573 The above variables that are strings are still pointing to areas within
574 decoded_parm. decoded_parm thus still needs to be kept allocated in
575 until we stop needing these variables
576 decoded_param will be deallocated at each exit point of this function */
579 /* We now have a pointer to the handle for the requested dissector
580 (requested protocol) inside the variable dissector_matching */
581 switch (dissector_table_selector_type) {
587 /* The selector for this table is an unsigned number. */
588 dissector_change(table_name, selector, dissector_matching);
593 /* The selector for this table is a string. */
594 dissector_change_string(table_name, selector_str, dissector_matching);
598 /* There are currently no dissector tables with any types other
599 than the ones listed above. */
600 g_assert_not_reached();
602 g_free(decoded_param); /* "Decode As" rule has been succesfully added */
607 main(int argc, char *argv[])
611 gboolean arg_error = FALSE;
617 char *gpf_path, *pf_path;
618 char *gdp_path, *dp_path;
619 int gpf_open_errno, gpf_read_errno;
620 int pf_open_errno, pf_read_errno;
621 int gdp_open_errno, gdp_read_errno;
622 int dp_open_errno, dp_read_errno;
625 gboolean capture_filter_specified = FALSE;
626 GList *if_list, *if_entry;
630 gchar err_str[PCAP_ERRBUF_SIZE];
631 gchar *cant_get_if_list_errstr;
632 gboolean list_link_layer_types = FALSE;
634 gboolean capture_option_specified = FALSE;
636 gboolean quiet = FALSE;
637 gchar *save_file = NULL;
638 int out_file_type = WTAP_FILE_PCAP;
639 gchar *cf_name = NULL, *rfilter = NULL;
641 gboolean start_capture = FALSE;
643 GList *lt_list, *lt_entry;
644 data_link_info_t *data_link_info;
646 #ifdef HAVE_PCAP_OPEN_DEAD
647 struct bpf_program fcode;
649 dfilter_t *rfcode = NULL;
653 /* initialize memory allocation subsystem */
658 capture_opts_init(&capture_opts, NULL /* cfile */);
661 timestamp_set_type(TS_RELATIVE);
662 timestamp_set_precision(TS_PREC_AUTO);
664 /* Register all dissectors; we must do this before checking for the
665 "-G" flag, as the "-G" flag dumps information registered by the
666 dissectors, and we must do it before we read the preferences, in
667 case any dissectors register preferences. */
668 epan_init(PLUGIN_DIR,register_all_protocols,register_all_protocol_handoffs,
669 failure_message,open_failure_message,read_failure_message);
671 /* Register all tap listeners; we do this before we parse the arguments,
672 as the "-z" argument can specify a registered tap. */
674 /* we register the plugin taps before the other taps because
675 stats_tree taps plugins will be registered as tap listeners
676 by stats_tree_stat.c and need to registered before that */
678 register_all_plugin_tap_listeners();
680 register_all_tap_listeners();
682 /* Now register the preferences for any non-dissector modules.
683 We must do that before we read the preferences as well. */
684 prefs_register_modules();
686 /* If invoked with the "-G" flag, we dump out information based on
687 the argument to the "-G" flag; if no argument is specified,
688 for backwards compatibility we dump out a glossary of display
691 We do this here to mirror what happens in the GTK+ version, although
692 it's not necessary here. */
693 handle_dashG_option(argc, argv, "tethereal");
695 /* Set the C-language locale to the native environment. */
696 setlocale(LC_ALL, "");
698 prefs = read_prefs(&gpf_open_errno, &gpf_read_errno, &gpf_path,
699 &pf_open_errno, &pf_read_errno, &pf_path);
700 if (gpf_path != NULL) {
701 if (gpf_open_errno != 0) {
702 fprintf(stderr, "Can't open global preferences file \"%s\": %s.\n",
703 pf_path, strerror(gpf_open_errno));
705 if (gpf_read_errno != 0) {
706 fprintf(stderr, "I/O error reading global preferences file \"%s\": %s.\n",
707 pf_path, strerror(gpf_read_errno));
710 if (pf_path != NULL) {
711 if (pf_open_errno != 0) {
712 fprintf(stderr, "Can't open your preferences file \"%s\": %s.\n", pf_path,
713 strerror(pf_open_errno));
715 if (pf_read_errno != 0) {
716 fprintf(stderr, "I/O error reading your preferences file \"%s\": %s.\n",
717 pf_path, strerror(pf_read_errno));
723 /* Set the name resolution code's flags from the preferences. */
724 g_resolv_flags = prefs->name_resolve;
726 /* Read the disabled protocols file. */
727 read_disabled_protos_list(&gdp_path, &gdp_open_errno, &gdp_read_errno,
728 &dp_path, &dp_open_errno, &dp_read_errno);
729 if (gdp_path != NULL) {
730 if (gdp_open_errno != 0) {
732 "Could not open global disabled protocols file\n\"%s\": %s.\n",
733 gdp_path, strerror(gdp_open_errno));
735 if (gdp_read_errno != 0) {
737 "I/O error reading global disabled protocols file\n\"%s\": %s.\n",
738 gdp_path, strerror(gdp_read_errno));
742 if (dp_path != NULL) {
743 if (dp_open_errno != 0) {
745 "Could not open your disabled protocols file\n\"%s\": %s.\n", dp_path,
746 strerror(dp_open_errno));
748 if (dp_read_errno != 0) {
750 "I/O error reading your disabled protocols file\n\"%s\": %s.\n", dp_path,
751 strerror(dp_read_errno));
757 /* Load Wpcap, if possible */
761 init_cap_file(&cfile);
763 /* Assemble the compile-time version information string */
764 comp_info_str = g_string_new("Compiled ");
765 get_compiled_version_info(comp_info_str);
767 /* Assemble the run-time version information string */
768 runtime_info_str = g_string_new("Running ");
769 get_runtime_version_info(runtime_info_str);
771 /* Print format defaults to this. */
772 print_format = PR_FMT_TEXT;
774 /* Now get our args */
775 while ((opt = getopt(argc, argv, "a:b:c:d:Df:F:hi:lLnN:o:pqr:R:s:St:T:vw:Vxy:z:")) != -1) {
777 case 'a': /* autostop criteria */
778 case 'b': /* Ringbuffer option */
779 case 'c': /* Capture xxx packets */
780 case 'f': /* capture filter */
781 case 'p': /* Don't capture in promiscuous mode */
782 case 's': /* Set the snapshot (capture) length */
783 case 'y': /* Set the pcap data link type */
785 capture_opts_add_opt(&capture_opts, "tethereal", opt, optarg, &start_capture);
787 capture_option_specified = TRUE;
791 case 'd': /* Decode as rule */
792 if (!add_decode_as(optarg))
795 case 'D': /* Print a list of capture devices */
797 if_list = get_interface_list(&err, err_str);
798 if (if_list == NULL) {
801 case CANT_GET_INTERFACE_LIST:
802 cant_get_if_list_errstr =
803 cant_get_if_list_error_message(err_str);
804 fprintf(stderr, "tethereal: %s\n", cant_get_if_list_errstr);
805 g_free(cant_get_if_list_errstr);
808 case NO_INTERFACES_FOUND:
809 fprintf(stderr, "tethereal: There are no interfaces on which a capture can be done\n");
814 i = 1; /* Interface id number */
815 for (if_entry = g_list_first(if_list); if_entry != NULL;
816 if_entry = g_list_next(if_entry)) {
817 if_info = if_entry->data;
818 printf("%d. %s", i++, if_info->name);
819 if (if_info->description != NULL)
820 printf(" (%s)", if_info->description);
823 free_interface_list(if_list);
826 capture_option_specified = TRUE;
831 out_file_type = wtap_short_string_to_file_type(optarg);
832 if (out_file_type < 0) {
833 fprintf(stderr, "tethereal: \"%s\" isn't a valid capture file type\n",
838 case 'h': /* Print help and exit */
842 case 'i': /* Use interface xxx */
845 * If the argument is a number, treat it as an index into the list
846 * of adapters, as printed by "tethereal -D".
848 * This should be OK on UNIX systems, as interfaces shouldn't have
849 * names that begin with digits. It can be useful on Windows, where
850 * more than one interface can have the same name.
852 adapter_index = strtol(optarg, &p, 10);
853 if (p != NULL && *p == '\0') {
854 if (adapter_index < 0) {
856 "tethereal: The specified adapter index is a negative number\n");
859 if (adapter_index > INT_MAX) {
861 "tethereal: The specified adapter index is too large (greater than %d)\n",
865 if (adapter_index == 0) {
866 fprintf(stderr, "tethereal: there is no interface with that adapter index\n");
869 if_list = get_interface_list(&err, err_str);
870 if (if_list == NULL) {
873 case CANT_GET_INTERFACE_LIST:
874 cant_get_if_list_errstr =
875 cant_get_if_list_error_message(err_str);
876 fprintf(stderr, "tethereal: %s\n", cant_get_if_list_errstr);
877 g_free(cant_get_if_list_errstr);
880 case NO_INTERFACES_FOUND:
881 fprintf(stderr, "tethereal: There are no interfaces on which a capture can be done\n");
886 if_info = g_list_nth_data(if_list, adapter_index - 1);
887 if (if_info == NULL) {
888 fprintf(stderr, "tethereal: there is no interface with that adapter index\n");
891 capture_opts.iface = g_strdup(if_info->name);
892 free_interface_list(if_list);
894 capture_opts.iface = g_strdup(optarg);
896 capture_option_specified = TRUE;
900 case 'l': /* "Line-buffer" standard output */
901 /* This isn't line-buffering, strictly speaking, it's just
902 flushing the standard output after the information for
903 each packet is printed; however, that should be good
904 enough for all the purposes to which "-l" is put (and
905 is probably actually better for "-V", as it does fewer
908 See the comment in "process_packet()" for an explanation of
909 why we do that, and why we don't just use "setvbuf()" to
910 make the standard output line-buffered (short version: in
911 Windows, "line-buffered" is the same as "fully-buffered",
912 and the output buffer is only flushed when it fills up). */
913 line_buffered = TRUE;
915 case 'L': /* Print list of link-layer types and exit */
917 list_link_layer_types = TRUE;
920 capture_option_specified = TRUE;
924 case 'n': /* No name resolution */
925 g_resolv_flags = RESOLV_NONE;
927 case 'N': /* Select what types of addresses/port #s to resolve */
928 if (g_resolv_flags == RESOLV_ALL)
929 g_resolv_flags = RESOLV_NONE;
930 badopt = string_to_name_resolve(optarg, &g_resolv_flags);
931 if (badopt != '\0') {
932 fprintf(stderr, "tethereal: -N specifies unknown resolving option '%c'; valid options are 'm', 'n', and 't'\n",
937 case 'o': /* Override preference from command line */
938 switch (prefs_set_pref(optarg)) {
940 case PREFS_SET_SYNTAX_ERR:
941 fprintf(stderr, "tethereal: Invalid -o flag \"%s\"\n", optarg);
945 case PREFS_SET_NO_SUCH_PREF:
946 case PREFS_SET_OBSOLETE:
947 fprintf(stderr, "tethereal: -o flag \"%s\" specifies unknown preference\n",
953 case 'q': /* Quiet */
956 case 'r': /* Read capture file xxx */
957 cf_name = g_strdup(optarg);
959 case 'R': /* Read file filter */
962 case 'S': /* show packets in real time */
963 print_packet_info = TRUE;
965 case 't': /* Time stamp type */
966 if (strcmp(optarg, "r") == 0)
967 timestamp_set_type(TS_RELATIVE);
968 else if (strcmp(optarg, "a") == 0)
969 timestamp_set_type(TS_ABSOLUTE);
970 else if (strcmp(optarg, "ad") == 0)
971 timestamp_set_type(TS_ABSOLUTE_WITH_DATE);
972 else if (strcmp(optarg, "d") == 0)
973 timestamp_set_type(TS_DELTA);
975 fprintf(stderr, "tethereal: Invalid time stamp type \"%s\"\n",
977 fprintf(stderr, "It must be \"r\" for relative, \"a\" for absolute,\n");
978 fprintf(stderr, "\"ad\" for absolute with date, or \"d\" for delta.\n");
982 case 'T': /* printing Type */
983 if (strcmp(optarg, "text") == 0) {
984 output_action = WRITE_TEXT;
985 print_format = PR_FMT_TEXT;
986 } else if (strcmp(optarg, "ps") == 0) {
987 output_action = WRITE_TEXT;
988 print_format = PR_FMT_PS;
989 } else if (strcmp(optarg, "pdml") == 0) {
990 output_action = WRITE_XML;
992 } else if (strcmp(optarg, "psml") == 0) {
993 output_action = WRITE_XML;
996 fprintf(stderr, "tethereal: Invalid -T parameter.\n");
997 fprintf(stderr, "It must be \"ps\", \"text\", \"pdml\", or \"psml\".\n");
1001 case 'v': /* Show version and exit */
1002 printf("t" PACKAGE " " VERSION "%s\n%s\n%s\n",
1003 svnversion, comp_info_str->str, runtime_info_str->str);
1006 case 'w': /* Write to capture file xxx */
1007 save_file = g_strdup(optarg);
1009 case 'V': /* Verbose */
1012 case 'x': /* Print packet data in hex (and ASCII) */
1016 /* We won't call the init function for the stat this soon
1017 as it would disallow MATE's fields (which are registered
1018 by the preferences set callback) from being used as
1019 part of a tap filter. Instead, we just add the argument
1020 to a list of stat arguments. */
1021 if (!process_stat_cmd_arg(optarg)) {
1022 fprintf(stderr,"tethereal: invalid -z argument.\n");
1023 fprintf(stderr," -z argument must be one of :\n");
1024 list_stat_cmd_args();
1029 case '?': /* Bad flag - print usage message */
1035 /* If no capture filter or read filter has been specified, and there are
1036 still command-line arguments, treat them as the tokens of a capture
1037 filter (if no "-r" flag was specified) or a read filter (if a "-r"
1038 flag was specified. */
1039 if (optind < argc) {
1040 if (cf_name != NULL) {
1041 if (rfilter != NULL) {
1043 "tethereal: Read filters were specified both with \"-R\" and with additional command-line arguments\n");
1046 rfilter = get_args_as_string(argc, argv, optind);
1049 if (capture_filter_specified) {
1051 "tethereal: Capture filters were specified both with \"-f\" and with additional command-line arguments\n");
1054 capture_opts.cfilter = get_args_as_string(argc, argv, optind);
1056 capture_option_specified = TRUE;
1061 /* See if we're writing a capture file and the file is a pipe */
1063 ld.output_to_pipe = FALSE;
1065 if (save_file != NULL) {
1066 /* We're writing to a capture file. */
1067 if (strcmp(save_file, "-") == 0) {
1068 /* Write to the standard output. */
1070 save_file = g_strdup("");
1072 /* XXX - should we check whether it's a pipe? It's arguably
1073 silly to do "-w - >output_file" rather than "-w output_file",
1074 but by not checking we might be violating the Principle Of
1075 Least Astonishment. */
1076 ld.output_to_pipe = TRUE;
1081 err = test_for_fifo(save_file);
1084 case ENOENT: /* it doesn't exist, so we'll be creating it,
1085 and it won't be a FIFO */
1086 case 0: /* found it, but it's not a FIFO */
1089 case ESPIPE: /* it is a FIFO */
1090 ld.output_to_pipe = TRUE;
1093 default: /* couldn't stat it */
1095 "tethereal: Error testing whether capture file is a pipe: %s\n",
1102 /* We're not writing to a file, so we should print packet information
1103 unless "-q" was specified. */
1105 print_packet_info = TRUE;
1108 #ifndef HAVE_LIBPCAP
1109 if (capture_option_specified)
1110 fprintf(stderr, "This version of Tethereal was not built with support for capturing packets.\n");
1117 /* We don't support capture filters when reading from a capture file
1118 (the BPF compiler doesn't support all link-layer types that we
1119 support in capture files we read). */
1121 if (cf_name != NULL) {
1122 if (capture_filter_specified) {
1124 "tethereal: Only read filters, not capture filters, can be specified when reading a capture file.\n");
1131 if (output_action != WRITE_TEXT) {
1132 fprintf(stderr, "tethereal: Raw packet hex data can only be printed as text or PostScript\n");
1138 if (list_link_layer_types) {
1139 /* We're supposed to list the link-layer types for an interface;
1140 did the user also specify a capture file to be read? */
1142 /* Yes - that's bogus. */
1143 fprintf(stderr, "tethereal: You can't specify -L and a capture file to be read.\n");
1146 /* No - did they specify a ring buffer option? */
1147 if (capture_opts.multi_files_on) {
1148 fprintf(stderr, "tethereal: Ring buffer requested, but a capture isn't being done.\n");
1152 /* If they didn't specify a "-w" flag, but specified a maximum capture
1153 file size, tell them that this doesn't work, and exit. */
1154 if (capture_opts.has_autostop_filesize && save_file == NULL) {
1155 fprintf(stderr, "tethereal: Maximum capture file size specified, but "
1156 "capture isn't being saved to a file.\n");
1160 if (capture_opts.multi_files_on) {
1161 /* Ring buffer works only under certain conditions:
1162 a) ring buffer does not work if you're not saving the capture to
1164 b) ring buffer only works if you're saving in libpcap format;
1165 c) it makes no sense to enable the ring buffer if the maximum
1166 file size is set to "infinite";
1167 d) file must not be a pipe. */
1168 if (save_file == NULL) {
1169 fprintf(stderr, "tethereal: Ring buffer requested, but "
1170 "capture isn't being saved to a file.\n");
1173 if (out_file_type != WTAP_FILE_PCAP) {
1174 fprintf(stderr, "tethereal: Ring buffer requested, but "
1175 "capture isn't being saved in libpcap format.\n");
1178 if (!capture_opts.has_autostop_filesize) {
1179 fprintf(stderr, "tethereal: Ring buffer requested, but "
1180 "no maximum capture file size was specified.\n");
1183 if (ld.output_to_pipe) {
1184 fprintf(stderr, "tethereal: Ring buffer requested, but "
1185 "capture file is a pipe.\n");
1193 /* Start windows sockets */
1194 WSAStartup( MAKEWORD( 1, 1 ), &wsaData );
1197 /* Notify all registered modules that have had any of their preferences
1198 changed either from one of the preferences file or from the command
1199 line that their preferences have changed. */
1202 /* At this point MATE will have registered its field array so we can
1203 have a tap filter with one of MATE's late-registered fields as part
1204 of the filter. We can now process all the "-z" arguments. */
1205 start_requested_stats();
1207 /* disabled protocols as per configuration file */
1208 if (gdp_path == NULL && dp_path == NULL) {
1209 set_disabled_protos_list();
1212 /* Build the column format array */
1213 col_setup(&cfile.cinfo, prefs->num_cols);
1214 for (i = 0; i < cfile.cinfo.num_cols; i++) {
1215 cfile.cinfo.col_fmt[i] = get_column_format(i);
1216 cfile.cinfo.col_title[i] = g_strdup(get_column_title(i));
1217 cfile.cinfo.fmt_matx[i] = (gboolean *) g_malloc0(sizeof(gboolean) *
1219 get_column_format_matches(cfile.cinfo.fmt_matx[i], cfile.cinfo.col_fmt[i]);
1220 cfile.cinfo.col_data[i] = NULL;
1221 if (cfile.cinfo.col_fmt[i] == COL_INFO)
1222 cfile.cinfo.col_buf[i] = (gchar *) g_malloc(sizeof(gchar) * COL_MAX_INFO_LEN);
1224 cfile.cinfo.col_buf[i] = (gchar *) g_malloc(sizeof(gchar) * COL_MAX_LEN);
1225 cfile.cinfo.col_fence[i] = 0;
1226 cfile.cinfo.col_expr[i] = (gchar *) g_malloc(sizeof(gchar) * COL_MAX_LEN);
1227 cfile.cinfo.col_expr_val[i] = (gchar *) g_malloc(sizeof(gchar) * COL_MAX_LEN);
1230 for (i = 0; i < cfile.cinfo.num_cols; i++) {
1233 for (j = 0; j < NUM_COL_FMTS; j++) {
1234 if (!cfile.cinfo.fmt_matx[i][j])
1237 if (cfile.cinfo.col_first[j] == -1)
1238 cfile.cinfo.col_first[j] = i;
1239 cfile.cinfo.col_last[j] = i;
1244 if (capture_opts.snaplen < 1)
1245 capture_opts.snaplen = WTAP_MAX_PACKET_SIZE;
1246 else if (capture_opts.snaplen < MIN_PACKET_SIZE)
1247 capture_opts.snaplen = MIN_PACKET_SIZE;
1249 /* Check the value range of the ring_num_files parameter */
1250 if (capture_opts.ring_num_files > RINGBUFFER_MAX_NUM_FILES)
1251 capture_opts.ring_num_files = RINGBUFFER_MAX_NUM_FILES;
1252 #if RINGBUFFER_MIN_NUM_FILES > 0
1253 else if (capture_opts.ring_num_files < RINGBUFFER_MIN_NUM_FILES)
1254 capture_opts.ring_num_files = RINGBUFFER_MIN_NUM_FILES;
1258 if (rfilter != NULL) {
1259 if (!dfilter_compile(rfilter, &rfcode)) {
1260 fprintf(stderr, "tethereal: %s\n", dfilter_error_msg);
1262 #ifdef HAVE_PCAP_OPEN_DEAD
1266 pc = pcap_open_dead(DLT_EN10MB, MIN_PACKET_SIZE);
1268 if (pcap_compile(pc, &fcode, rfilter, 0, 0) != -1) {
1270 " Note: That display filter code looks like a valid capture filter;\n"
1271 " maybe you mixed them up?\n");
1280 cfile.rfcode = rfcode;
1282 if (print_packet_info) {
1283 /* If we're printing as text or PostScript, we have
1284 to create a print stream. */
1285 if (output_action == WRITE_TEXT) {
1286 switch (print_format) {
1289 print_stream = print_stream_text_stdio_new(stdout);
1293 print_stream = print_stream_ps_stdio_new(stdout);
1297 g_assert_not_reached();
1302 /* We have to dissect each packet if:
1304 we're printing information about each packet;
1306 we're using a read filter on the packets;
1308 we're using any taps. */
1309 do_dissection = print_packet_info || rfcode || have_tap_listeners();
1313 * We're reading a capture file.
1318 * Immediately relinquish any set-UID or set-GID privileges we have;
1319 * we must not be allowed to read any capture files the user running
1320 * Tethereal can't open.
1326 if (cf_open(&cfile, cf_name, FALSE, &err) != CF_OK) {
1331 /* Set timestamp precision; there should arguably be a command-line
1332 option to let the user set this. */
1333 switch(wtap_file_tsprecision(cfile.wth)) {
1334 case(WTAP_FILE_TSPREC_SEC):
1335 timestamp_set_precision(TS_PREC_AUTO_SEC);
1337 case(WTAP_FILE_TSPREC_DSEC):
1338 timestamp_set_precision(TS_PREC_AUTO_DSEC);
1340 case(WTAP_FILE_TSPREC_CSEC):
1341 timestamp_set_precision(TS_PREC_AUTO_CSEC);
1343 case(WTAP_FILE_TSPREC_MSEC):
1344 timestamp_set_precision(TS_PREC_AUTO_MSEC);
1346 case(WTAP_FILE_TSPREC_USEC):
1347 timestamp_set_precision(TS_PREC_AUTO_USEC);
1349 case(WTAP_FILE_TSPREC_NSEC):
1350 timestamp_set_precision(TS_PREC_AUTO_NSEC);
1353 g_assert_not_reached();
1356 /* Process the packets in the file */
1357 err = load_cap_file(&cfile, save_file, out_file_type);
1364 /* No capture file specified, so we're supposed to do a live capture
1365 (or get a list of link-layer types for a live capture device);
1366 do we have support for live captures? */
1373 fprintf(stderr, "tethereal: WinPcap couldn't be found.\n");
1374 detailed_err = cant_load_winpcap_err("Tethereal");
1375 fprintf(stderr, "%s\n", detailed_err);
1376 g_free(detailed_err);
1381 /* Yes; did the user specify an interface to use? */
1382 if (capture_opts.iface == NULL) {
1383 /* No - is a default specified in the preferences file? */
1384 if (prefs->capture_device != NULL) {
1386 if_text = strrchr(prefs->capture_device, ' ');
1387 if (if_text == NULL) {
1388 capture_opts.iface = g_strdup(prefs->capture_device);
1390 capture_opts.iface = g_strdup(if_text + 1); /* Skip over space */
1393 /* No - pick the first one from the list of interfaces. */
1394 if_list = get_interface_list(&err, err_str);
1395 if (if_list == NULL) {
1398 case CANT_GET_INTERFACE_LIST:
1399 cant_get_if_list_errstr = cant_get_if_list_error_message(err_str);
1400 fprintf(stderr, "tethereal: %s\n", cant_get_if_list_errstr);
1401 g_free(cant_get_if_list_errstr);
1404 case NO_INTERFACES_FOUND:
1405 fprintf(stderr, "tethereal: There are no interfaces on which a capture can be done\n");
1410 if_info = if_list->data; /* first interface */
1411 capture_opts.iface = g_strdup(if_info->name);
1412 free_interface_list(if_list);
1416 if (list_link_layer_types) {
1417 /* We were asked to list the link-layer types for an interface.
1418 Get the list of link-layer types for the capture device. */
1419 lt_list = get_pcap_linktype_list(capture_opts.iface, err_str);
1420 if (lt_list == NULL) {
1421 if (err_str[0] != '\0') {
1422 fprintf(stderr, "tethereal: The list of data link types for the capture device could not be obtained (%s).\n"
1423 "Please check to make sure you have sufficient permissions, and that\n"
1424 "you have the proper interface or pipe specified.\n", err_str);
1426 fprintf(stderr, "tethereal: The capture device has no data link types.\n");
1429 fprintf(stderr, "Data link types (use option -y to set):\n");
1430 for (lt_entry = lt_list; lt_entry != NULL;
1431 lt_entry = g_list_next(lt_entry)) {
1432 data_link_info = lt_entry->data;
1433 fprintf(stderr, " %s", data_link_info->name);
1434 if (data_link_info->description != NULL)
1435 fprintf(stderr, " (%s)", data_link_info->description);
1437 fprintf(stderr, " (not supported)");
1440 free_pcap_linktype_list(lt_list);
1446 * The user didn't ask us not to print a count of packets as
1447 * they arrive, so do so.
1449 print_packet_counts = TRUE;
1452 /* For now, assume libpcap gives microsecond precision. */
1453 timestamp_set_precision(TS_PREC_AUTO_USEC);
1455 capture(save_file, out_file_type);
1457 if (capture_opts.multi_files_on) {
1461 /* No - complain. */
1462 fprintf(stderr, "This version of Tethereal was not built with support for capturing packets.\n");
1467 draw_tap_listeners(TRUE);
1474 /* Do the low-level work of a capture.
1475 Returns TRUE if it succeeds, FALSE otherwise. */
1477 static condition *volatile cnd_ring_timeout = NULL; /* this must be visible in process_packet */
1480 capture(char *save_file, int out_file_type)
1484 gchar open_err_str[PCAP_ERRBUF_SIZE];
1485 gchar lookup_net_err_str[PCAP_ERRBUF_SIZE];
1486 bpf_u_int32 netnum, netmask;
1487 struct bpf_program fcode;
1488 const char *set_linktype_err_str;
1490 int volatile volatile_err = 0;
1491 int volatile inpkts = 0;
1493 char errmsg[1024+1];
1494 condition *volatile cnd_stop_capturesize = NULL;
1495 condition *volatile cnd_stop_timeout = NULL;
1498 void (*oldhandler)(int);
1499 static const char ppamsg[] = "can't find PPA for ";
1500 const char *libpcap_warn;
1501 volatile int pipe_fd = -1;
1502 struct pcap_hdr hdr;
1503 struct pcaprec_modified_hdr rechdr;
1504 guchar pcap_data[WTAP_MAX_PACKET_SIZE];
1506 struct pcap_stat stats;
1509 dfilter_t *rfcode = NULL;
1512 /* Initialize all data structures used for dissection. */
1515 ld.linktype = WTAP_ENCAP_UNKNOWN;
1518 /* Open the network interface to capture from it.
1519 Some versions of libpcap may put warnings into the error buffer
1520 if they succeed; to tell if that's happened, we have to clear
1521 the error buffer, and check if it's still a null string. */
1522 open_err_str[0] = '\0';
1523 ld.pch = pcap_open_live(capture_opts.iface, capture_opts.snaplen,
1524 capture_opts.promisc_mode, 1000, open_err_str);
1526 if (ld.pch != NULL) {
1527 /* setting the data link type only works on real interfaces */
1528 if (capture_opts.linktype != -1) {
1529 set_linktype_err_str = set_pcap_linktype(ld.pch, capture_opts.iface,
1530 capture_opts.linktype);
1531 if (set_linktype_err_str != NULL) {
1532 g_snprintf(errmsg, sizeof errmsg, "Unable to set data link type (%s).",
1533 set_linktype_err_str);
1538 /* We couldn't open "cfile.iface" as a network device. */
1540 /* On Windows, we don't support capturing on pipes, so we give up. */
1542 /* On Win32 OSes, the capture devices are probably available to all
1543 users; don't warn about permissions problems.
1545 Do, however, warn about the lack of 64-bit support, and warn that
1546 WAN devices aren't supported. */
1547 g_snprintf(errmsg, sizeof errmsg,
1548 "The capture session could not be initiated (%s).\n"
1549 "Please check that you have the proper interface specified.\n"
1551 "Help can be found at: http://wiki.ethereal.com/CaptureSetup\n"
1553 "WinPcap does not support 64-bit Windows, so you will not be able to capture\n"
1554 "traffic with Tethereal on 64-bit Windows. You will have to use some other\n"
1555 "tool to capture traffic, such as netcap; see\n"
1557 " http://support.microsoft.com/?id=310875\n"
1559 "for information about netcap.\n"
1561 "Note that version 3.0 of WinPcap, and earlier versions of WinPcap, don't\n"
1562 "support capturing on PPP/WAN interfaces on Windows NT 4.0 / 2000 / XP /\n"
1564 "WinPcap 3.1 has support for it on Windows 2000 / XP / Server 2003, but has no\n"
1565 "support for it on Windows NT 4.0 or Windows Vista (Beta 1).\n",
1569 /* try to open cfile.iface as a pipe */
1570 pipe_fd = pipe_open_live(capture_opts.iface, &hdr, &ld, errmsg,
1573 if (pipe_fd == -1) {
1575 if (ld.pipe_err == PIPNEXIST) {
1576 /* Pipe doesn't exist, so output message for interface */
1578 /* If we got a "can't find PPA for XXX" message, warn the user (who
1579 is running Tethereal on HP-UX) that they don't have a version
1580 of libpcap that properly handles HP-UX (libpcap 0.6.x and later
1581 versions, which properly handle HP-UX, say "can't find /dev/dlpi
1582 PPA for XXX" rather than "can't find PPA for XXX"). */
1583 if (strncmp(open_err_str, ppamsg, sizeof ppamsg - 1) == 0)
1586 "You are running Tethereal with a version of the libpcap library\n"
1587 "that doesn't handle HP-UX network devices well; this means that\n"
1588 "Tethereal may not be able to capture packets.\n"
1590 "To fix this, you should install libpcap 0.6.2, or a later version\n"
1591 "of libpcap, rather than libpcap 0.4 or 0.5.x. It is available in\n"
1592 "packaged binary form from the Software Porting And Archive Centre\n"
1593 "for HP-UX; the Centre is at http://hpux.connect.org.uk/ - the page\n"
1594 "at the URL lists a number of mirror sites.";
1597 g_snprintf(errmsg, sizeof errmsg,
1598 "The capture session could not be initiated (%s).\n"
1599 "Please check to make sure you have sufficient permissions, and that\n"
1600 "you have the proper interface or pipe specified.%s", open_err_str,
1604 * Else pipe (or file) does exist and pipe_open_live() has
1609 /* pipe_open_live() succeeded; don't want
1610 error message from pcap_open_live() */
1611 open_err_str[0] = '\0';
1617 * We've opened the capture device, so, if we're set-UID or set-GID,
1618 * relinquish those privileges.
1620 * XXX - if we have saved set-user-ID support, we should give up those
1621 * privileges immediately, and then reclaim them long enough to get
1622 * a list of network interfaces and to open one, and then give them
1623 * up again, so that stuff we do while processing the argument list,
1624 * reading the user's preferences, etc. is done as the real user and
1625 * group, not the effective user and group.
1631 if (capture_opts.cfilter && !ld.from_pipe) {
1632 /* A capture filter was specified; set it up. */
1633 if (pcap_lookupnet(capture_opts.iface, &netnum, &netmask, lookup_net_err_str) < 0) {
1635 * Well, we can't get the netmask for this interface; it's used
1636 * only for filters that check for broadcast IP addresses, so
1637 * we just warn the user, and punt and use 0.
1640 "Warning: Couldn't obtain netmask info (%s).\n", lookup_net_err_str);
1643 if (pcap_compile(ld.pch, &fcode, capture_opts.cfilter, 1, netmask) < 0) {
1644 if (dfilter_compile(capture_opts.cfilter, &rfcode)) {
1645 g_snprintf(errmsg, sizeof errmsg,
1646 "Unable to parse capture filter string (%s).\n"
1647 " Interestingly enough, this looks like a valid display filter\n"
1648 " Are you sure you didn't mix them up?",
1649 pcap_geterr(ld.pch));
1651 g_snprintf(errmsg, sizeof errmsg,
1652 "Unable to parse capture filter string (%s).",
1653 pcap_geterr(ld.pch));
1657 if (pcap_setfilter(ld.pch, &fcode) < 0) {
1658 g_snprintf(errmsg, sizeof errmsg, "Can't install filter (%s).",
1659 pcap_geterr(ld.pch));
1660 #ifdef HAVE_PCAP_FREECODE
1661 pcap_freecode(&fcode);
1665 #ifdef HAVE_PCAP_FREECODE
1666 pcap_freecode(&fcode);
1670 /* Set up to write to the capture file. */
1673 pcap_encap = hdr.network;
1674 file_snaplen = hdr.snaplen;
1678 pcap_encap = get_pcap_linktype(ld.pch, capture_opts.iface);
1679 file_snaplen = pcap_snapshot(ld.pch);
1681 ld.linktype = wtap_pcap_encap_to_wtap_encap(pcap_encap);
1682 if (save_file != NULL) {
1683 /* Set up to write to the capture file. */
1684 if (ld.linktype == WTAP_ENCAP_UNKNOWN) {
1685 strcpy(errmsg, "The network you're capturing from is of a type"
1686 " that Tethereal doesn't support.");
1689 ld.save_file = save_file;
1690 if (capture_opts.multi_files_on) {
1691 save_file_fd = ringbuf_init(save_file,
1692 capture_opts.ring_num_files);
1693 if (save_file_fd != -1) {
1694 ld.pdh = ringbuf_init_wtap_dump_fdopen(out_file_type, ld.linktype,
1695 file_snaplen, &err);
1697 err = errno; /* "ringbuf_init()" failed */
1701 ld.pdh = wtap_dump_open(save_file, out_file_type,
1702 ld.linktype, file_snaplen, FALSE /* compress */, &err);
1705 if (ld.pdh == NULL) {
1706 g_snprintf(errmsg, sizeof errmsg,
1707 cf_open_error_message(err, NULL, TRUE, out_file_type),
1708 *save_file == '\0' ? "stdout" : save_file);
1713 /* Does "open_err_str" contain a non-empty string? If so, "pcap_open_live()"
1714 returned a warning; print it, but keep capturing. */
1715 if (open_err_str[0] != '\0')
1716 fprintf(stderr, "tethereal: WARNING: %s.\n", open_err_str);
1719 /* Catch a CTRL+C event and, if we get it, clean up and exit. */
1720 SetConsoleCtrlHandler(capture_cleanup, TRUE);
1722 /* Catch SIGINT and SIGTERM and, if we get either of them, clean up
1724 XXX - deal with signal semantics on various UNIX platforms. Or just
1725 use "sigaction()" and be done with it? */
1726 signal(SIGTERM, capture_cleanup);
1727 signal(SIGINT, capture_cleanup);
1728 if ((oldhandler = signal(SIGHUP, capture_cleanup)) != SIG_DFL)
1729 signal(SIGHUP, oldhandler);
1732 /* Catch SIGINFO and, if we get it and we're capturing to a file in
1733 quiet mode, report the number of packets we've captured. */
1734 signal(SIGINFO, report_counts_siginfo);
1735 #endif /* SIGINFO */
1738 /* Let the user know what interface was chosen. */
1739 descr = get_interface_descriptive_name(capture_opts.iface);
1740 fprintf(stderr, "Capturing on %s\n", descr);
1743 /* initialize capture stop conditions */
1744 init_capture_stop_conditions();
1745 /* create stop conditions */
1746 if (capture_opts.has_autostop_filesize)
1747 cnd_stop_capturesize = cnd_new((const char*)CND_CLASS_CAPTURESIZE,
1748 (long)capture_opts.autostop_filesize * 1024);
1749 if (capture_opts.has_autostop_duration)
1750 cnd_stop_timeout = cnd_new((const char*)CND_CLASS_TIMEOUT,
1751 (gint32)capture_opts.autostop_duration);
1753 if (capture_opts.multi_files_on && capture_opts.has_file_duration)
1754 cnd_ring_timeout = cnd_new(CND_CLASS_TIMEOUT,
1755 capture_opts.file_duration);
1757 if (!setjmp(ld.stopenv)) {
1759 ld.packet_count = 0;
1763 /* We need to be careful with automatic variables defined in the
1764 outer scope which are changed inside the loop. Most compilers
1765 don't try to roll them back to their original values after the
1766 longjmp which causes the loop to finish, but all that the
1767 standards say is that their values are indeterminate. If we
1768 don't want them to be rolled back, we should define them with the
1769 volatile attribute (paraphrasing W. Richard Stevens, Advanced
1770 Programming in the UNIX Environment, p. 178).
1772 The "err" variable causes a particular problem. If we give it
1773 the volatile attribute, then when we pass a reference to it (as
1774 in "&err") to a function, GCC warns: "passing arg <n> of
1775 <function> discards qualifiers from pointer target type".
1776 Therefore within the loop and just beyond we don't use "err".
1777 Within the loop we define "loop_err", and assign its value to
1778 "volatile_err", which is in the outer scope and is checked when
1781 We also define "packet_count_prev" here to keep things tidy,
1782 since it's used only inside the loop. If it were defined in the
1783 outer scope, GCC would give a warning (unnecessary in this case)
1784 that it might be clobbered, and we'd need to give it the volatile
1785 attribute to suppress the warning. */
1788 int packet_count_prev = 0;
1790 if (cnd_stop_capturesize == NULL && cnd_stop_timeout == NULL) {
1791 /* We're not stopping at a particular capture file size, and we're
1792 not stopping after some particular amount of time has expired,
1793 so either we have no stop condition or the only stop condition
1794 is a maximum packet count.
1796 If there's no maximum packet count, pass it -1, meaning "until
1797 you run out of packets in the bufferful you read". Otherwise,
1798 pass it the number of packets we have left to capture.
1800 We don't call "pcap_loop()" as, if we're saving to a file that's
1801 a FIFO, we want to flush the FIFO after we're done processing
1802 this libpcap bufferful of packets, so that the program
1803 reading the FIFO sees the packets immediately and doesn't get
1804 any partial packet, forcing it to block in the middle of reading
1806 if (capture_opts.autostop_packets == 0)
1809 if (ld.packet_count >= capture_opts.autostop_packets) {
1810 /* XXX do we need this test here? */
1811 /* It appears there's nothing more to capture. */
1814 pcap_cnt = capture_opts.autostop_packets - ld.packet_count;
1817 /* We need to check the capture file size or the timeout after
1823 inpkts = pipe_dispatch(pipe_fd, &ld, &hdr, &rechdr, pcap_data,
1824 errmsg, sizeof errmsg);
1827 inpkts = pcap_dispatch(ld.pch, pcap_cnt, capture_pcap_cb, (u_char *) &ld);
1829 /* Error from "pcap_dispatch()", or error or "no more packets" from
1830 "pipe_dispatch(). */
1832 } else if (cnd_stop_timeout != NULL && cnd_eval(cnd_stop_timeout)) {
1833 /* The specified capture time has elapsed; stop the capture. */
1835 } else if (inpkts > 0) {
1836 if (capture_opts.autostop_packets != 0 &&
1837 ld.packet_count >= capture_opts.autostop_packets) {
1838 /* The specified number of packets have been captured and have
1839 passed both any capture filter in effect and any read filter
1842 } else if (cnd_stop_capturesize != NULL &&
1843 cnd_eval(cnd_stop_capturesize,
1844 (guint32)wtap_get_bytes_dumped(ld.pdh))) {
1845 /* We're saving the capture to a file, and the capture file reached
1846 its maximum size. */
1847 if (capture_opts.multi_files_on) {
1848 /* Switch to the next ringbuffer file */
1849 if (ringbuf_switch_file(&ld.pdh, &save_file, &save_file_fd, &loop_err)) {
1850 /* File switch succeeded: reset the condition */
1851 cnd_reset(cnd_stop_capturesize);
1852 if (cnd_ring_timeout) {
1853 cnd_reset(cnd_ring_timeout);
1856 /* File switch failed: stop here */
1857 volatile_err = loop_err;
1861 /* No ringbuffer - just stop. */
1865 if (ld.output_to_pipe) {
1866 if (ld.packet_count > packet_count_prev) {
1867 wtap_dump_flush(ld.pdh);
1868 packet_count_prev = ld.packet_count;
1872 } /* while (ld.go) */
1874 /* delete stop conditions */
1875 if (cnd_stop_capturesize != NULL)
1876 cnd_delete(cnd_stop_capturesize);
1877 if (cnd_stop_timeout != NULL)
1878 cnd_delete(cnd_stop_timeout);
1879 if (cnd_ring_timeout != NULL)
1880 cnd_delete(cnd_ring_timeout);
1882 if (print_packet_counts) {
1883 /* We're printing packet counts to stderr.
1884 Send a newline so that we move to the line after the packet count. */
1885 fprintf(stderr, "\n");
1888 /* If we got an error while capturing, report it. */
1892 if (ld.pipe_err == PIPERR) {
1893 fprintf(stderr, "tethereal: Error while capturing packets: %s\n",
1899 fprintf(stderr, "tethereal: Error while capturing packets: %s\n",
1900 pcap_geterr(ld.pch));
1904 if (volatile_err == 0)
1907 show_capture_file_io_error(save_file, volatile_err, FALSE);
1911 if (save_file != NULL) {
1912 /* We're saving to a file or files; close all files. */
1913 if (capture_opts.multi_files_on) {
1914 dump_ok = ringbuf_wtap_dump_close(&save_file, &err);
1916 dump_ok = wtap_dump_close(ld.pdh, &err);
1918 /* If we've displayed a message about a write error, there's no point
1919 in displaying another message about an error on close. */
1920 if (!dump_ok && !write_err)
1921 show_capture_file_io_error(save_file, err, TRUE);
1925 if (ld.from_pipe && pipe_fd >= 0)
1930 /* Get the capture statistics, and, if any packets were dropped, report
1932 if (pcap_stats(ld.pch, &stats) >= 0) {
1933 if (stats.ps_drop != 0) {
1934 fprintf(stderr, "%u packets dropped\n", stats.ps_drop);
1937 fprintf(stderr, "tethereal: Can't get packet-drop statistics: %s\n",
1938 pcap_geterr(ld.pch));
1943 /* Report the number of captured packets if not reported during capture
1944 and we are saving to a file. */
1950 if (capture_opts.multi_files_on) {
1951 ringbuf_error_cleanup();
1955 fprintf(stderr, "tethereal: %s\n", errmsg);
1971 capture_pcap_cb(u_char *user, const struct pcap_pkthdr *phdr,
1974 struct wtap_pkthdr whdr;
1975 union wtap_pseudo_header pseudo_header;
1976 loop_data *ldat = (loop_data *) user;
1981 /* Convert from libpcap to Wiretap format.
1982 If that fails, ignore the packet (wtap_process_pcap_packet has
1983 written an error message). */
1984 pd = wtap_process_pcap_packet(ldat->linktype, phdr, pd, &pseudo_header,
1991 * Prevent a SIGINFO handler from writing to stdout while we're
1992 * doing so; instead, have it just set a flag telling us to print
1993 * that information when we're done.
1996 #endif /* SIGINFO */
1998 /* The current packet may have arrived after a very long silence,
1999 * way past the time to switch files. In order not to have
2000 * the first packet of a new series of events as the last
2001 * [or only] packet in the file, switch before writing!
2003 if (cnd_ring_timeout != NULL && cnd_eval(cnd_ring_timeout)) {
2004 /* time elapsed for this ring file, switch to the next */
2005 if (ringbuf_switch_file(&ldat->pdh, &ldat->save_file, &save_file_fd, &loop_err)) {
2006 /* File switch succeeded: reset the condition */
2007 cnd_reset(cnd_ring_timeout);
2009 /* File switch failed: stop here */
2010 /* XXX - we should do something with "loop_err" */
2015 if (!process_packet(&cfile, ldat->pdh, 0, &whdr, &pseudo_header, pd, &err)) {
2016 /* Error writing to a capture file */
2017 if (print_packet_counts) {
2018 /* We're printing counts of packets captured; move to the line after
2020 fprintf(stderr, "\n");
2022 show_capture_file_io_error(ldat->save_file, err, FALSE);
2023 pcap_close(ldat->pch);
2024 wtap_dump_close(ldat->pdh, &err);
2030 * Allow SIGINFO handlers to write.
2035 * If a SIGINFO handler asked us to write out capture counts, do so.
2039 #endif /* SIGINFO */
2044 capture_cleanup(DWORD ctrltype _U_)
2046 /* CTRL_C_EVENT is sort of like SIGINT, CTRL_BREAK_EVENT is unique to
2047 Windows, CTRL_CLOSE_EVENT is sort of like SIGHUP, CTRL_LOGOFF_EVENT
2048 is also sort of like SIGHUP, and CTRL_SHUTDOWN_EVENT is sort of
2049 like SIGTERM at least when the machine's shutting down.
2051 For now, we handle them all as indications that we should clean up
2052 and quit, just as we handle SIGINT, SIGHUP, and SIGTERM in that
2055 However, as handlers run in a new thread, we can't just longjmp
2056 out; we have to set "ld.go" to FALSE, and must return TRUE so that
2057 no other handler - such as one that would terminate the process -
2060 XXX - for some reason, typing ^C to Tethereal, if you run this in
2061 a Cygwin console window in at least some versions of Cygwin,
2062 causes Tethereal to terminate immediately; this routine gets
2063 called, but the main loop doesn't get a chance to run and
2064 exit cleanly, at least if this is compiled with Microsoft Visual
2065 C++ (i.e., it's a property of the Cygwin console window or Bash;
2066 it happens if Tethereal is not built with Cygwin - for all I know,
2067 building it with Cygwin may make the problem go away). */
2073 capture_cleanup(int signum _U_)
2075 /* Longjmp back to the starting point; "pcap_dispatch()", on many
2076 UNIX platforms, just keeps looping if it gets EINTR, so if we set
2077 "ld.go" to FALSE and return, we won't break out of it and quit
2079 longjmp(ld.stopenv, 1);
2087 /* XXX - if we use sigaction, this doesn't have to be done.
2088 (Yes, this isn't necessary on BSD, but just in case a system
2089 where "signal()" has AT&T semantics adopts SIGINFO....) */
2090 signal(SIGINFO, report_counts_siginfo);
2091 #endif /* SIGINFO */
2093 if (!print_packet_counts) {
2094 /* Report the count only if we aren't printing a packet count
2095 as packets arrive. */
2096 fprintf(stderr, "%u packets captured\n", ld.packet_count);
2099 infoprint = FALSE; /* we just reported it */
2100 #endif /* SIGINFO */
2105 report_counts_siginfo(int signum _U_)
2107 int sav_errno = errno;
2108 /* If we've been told to delay printing, just set a flag asking
2109 that we print counts (if we're supposed to), otherwise print
2110 the count of packets captured (if we're supposed to). */
2117 #endif /* SIGINFO */
2118 #endif /* HAVE_LIBPCAP */
2121 load_cap_file(capture_file *cf, char *save_file, int out_file_type)
2124 int snapshot_length;
2130 linktype = wtap_file_encap(cf->wth);
2131 if (save_file != NULL) {
2132 /* Set up to write to the capture file. */
2133 snapshot_length = wtap_snapshot_length(cf->wth);
2134 if (snapshot_length == 0) {
2135 /* Snapshot length of input file not known. */
2136 snapshot_length = WTAP_MAX_PACKET_SIZE;
2138 pdh = wtap_dump_open(save_file, out_file_type,
2139 linktype, snapshot_length, FALSE /* compressed */, &err);
2142 /* We couldn't set up to write to the capture file. */
2145 case WTAP_ERR_UNSUPPORTED_FILE_TYPE:
2147 "tethereal: Capture files can't be written in that format.\n");
2150 case WTAP_ERR_UNSUPPORTED_ENCAP:
2151 case WTAP_ERR_ENCAP_PER_PACKET_UNSUPPORTED:
2153 "tethereal: The capture file being read can't be written in "
2157 case WTAP_ERR_CANT_OPEN:
2159 "tethereal: The file \"%s\" couldn't be created for some "
2160 "unknown reason.\n",
2161 *save_file == '\0' ? "stdout" : save_file);
2164 case WTAP_ERR_SHORT_WRITE:
2166 "tethereal: A full header couldn't be written to the file \"%s\".\n",
2167 *save_file == '\0' ? "stdout" : save_file);
2172 "tethereal: The file \"%s\" could not be created: %s\n.",
2173 *save_file == '\0' ? "stdout" : save_file,
2174 wtap_strerror(err));
2180 if (print_packet_info) {
2181 if (!write_preamble(cf)) {
2183 show_print_file_io_error(err);
2189 while (wtap_read(cf->wth, &err, &err_info, &data_offset)) {
2190 if (!process_packet(cf, pdh, data_offset, wtap_phdr(cf->wth),
2191 wtap_pseudoheader(cf->wth), wtap_buf_ptr(cf->wth),
2193 /* Error writing to a capture file */
2194 show_capture_file_io_error(save_file, err, FALSE);
2195 wtap_dump_close(pdh, &err);
2200 /* Print a message noting that the read failed somewhere along the line. */
2203 case WTAP_ERR_UNSUPPORTED_ENCAP:
2205 "tethereal: \"%s\" has a packet with a network type that Tethereal doesn't support.\n(%s)\n",
2206 cf->filename, err_info);
2209 case WTAP_ERR_CANT_READ:
2211 "tethereal: An attempt to read from \"%s\" failed for some unknown reason.\n",
2215 case WTAP_ERR_SHORT_READ:
2217 "tethereal: \"%s\" appears to have been cut short in the middle of a packet.\n",
2221 case WTAP_ERR_BAD_RECORD:
2223 "tethereal: \"%s\" appears to be damaged or corrupt.\n(%s)\n",
2224 cf->filename, err_info);
2229 "tethereal: An error occurred while reading \"%s\": %s.\n",
2230 cf->filename, wtap_strerror(err));
2233 if (save_file != NULL) {
2234 /* Now close the capture file. */
2235 if (!wtap_dump_close(pdh, &err))
2236 show_capture_file_io_error(save_file, err, TRUE);
2239 if (save_file != NULL) {
2240 /* Now close the capture file. */
2241 if (!wtap_dump_close(pdh, &err))
2242 show_capture_file_io_error(save_file, err, TRUE);
2244 if (print_packet_info) {
2245 if (!write_finale()) {
2247 show_print_file_io_error(err);
2254 wtap_close(cf->wth);
2261 fill_in_fdata(frame_data *fdata, capture_file *cf,
2262 const struct wtap_pkthdr *phdr, long offset)
2267 fdata->num = cf->count;
2268 fdata->pkt_len = phdr->len;
2269 cum_bytes += phdr->len;
2270 fdata->cum_bytes = cum_bytes;
2271 fdata->cap_len = phdr->caplen;
2272 fdata->file_off = offset;
2273 fdata->lnk_t = phdr->pkt_encap;
2274 fdata->abs_ts = *((nstime_t *) &phdr->ts);
2275 fdata->flags.passed_dfilter = 0;
2276 fdata->flags.encoding = CHAR_ASCII;
2277 fdata->flags.visited = 0;
2278 fdata->flags.marked = 0;
2279 fdata->flags.ref_time = 0;
2281 /* If we don't have the time stamp of the first packet in the
2282 capture, it's because this is the first packet. Save the time
2283 stamp of this packet as the time stamp of the first packet. */
2284 if (nstime_is_zero(&first_ts)) {
2285 first_ts = fdata->abs_ts;
2288 /* If we don't have the time stamp of the previous displayed packet,
2289 it's because this is the first displayed packet. Save the time
2290 stamp of this packet as the time stamp of the previous displayed
2292 if (nstime_is_zero(&prev_ts)) {
2293 prev_ts = fdata->abs_ts;
2296 /* Get the time elapsed between the first packet and this packet. */
2297 nstime_delta(&fdata->rel_ts, &fdata->abs_ts, &first_ts);
2299 /* If it's greater than the current elapsed time, set the elapsed time
2300 to it (we check for "greater than" so as not to be confused by
2301 time moving backwards). */
2302 if ((gint32)cf->elapsed_time.secs < fdata->rel_ts.secs
2303 || ((gint32)cf->elapsed_time.secs == fdata->rel_ts.secs && (gint32)cf->elapsed_time.nsecs < fdata->rel_ts.nsecs)) {
2304 cf->elapsed_time = fdata->rel_ts;
2307 /* Get the time elapsed between the previous displayed packet and
2309 nstime_delta(&fdata->del_ts, &fdata->abs_ts, &prev_ts);
2310 prev_ts = fdata->abs_ts;
2313 /* Free up all data attached to a "frame_data" structure. */
2315 clear_fdata(frame_data *fdata)
2318 g_slist_free(fdata->pfd);
2322 process_packet(capture_file *cf, wtap_dumper *pdh, long offset,
2323 const struct wtap_pkthdr *whdr,
2324 union wtap_pseudo_header *pseudo_header, const guchar *pd,
2328 gboolean create_proto_tree;
2329 epan_dissect_t *edt;
2332 /* Count this packet. */
2335 /* If we're going to print packet information, or we're going to
2336 run a read filter, or we're going to process taps, set up to
2337 do a dissection and do so. */
2338 if (do_dissection) {
2339 fill_in_fdata(&fdata, cf, whdr, offset);
2341 if (print_packet_info) {
2342 /* Grab any resolved addresses */
2344 if (g_resolv_flags) {
2345 host_name_lookup_process(NULL);
2350 if (cf->rfcode || verbose || num_tap_filters!=0)
2351 create_proto_tree = TRUE;
2353 create_proto_tree = FALSE;
2354 /* The protocol tree will be "visible", i.e., printed, only if we're
2355 printing packet details, which is true if we're printing stuff
2356 ("print_packet_info" is true) and we're in verbose mode ("verbose"
2358 edt = epan_dissect_new(create_proto_tree, print_packet_info && verbose);
2360 /* If we're running a read filter, prime the epan_dissect_t with that
2363 epan_dissect_prime_dfilter(edt, cf->rfcode);
2365 tap_queue_init(edt);
2367 /* We only need the columns if we're printing packet info but we're
2368 *not* verbose; in verbose mode, we print the protocol tree, not
2369 the protocol summary. */
2370 epan_dissect_run(edt, pseudo_header, pd, &fdata,
2371 (print_packet_info && !verbose) ? &cf->cinfo : NULL);
2373 tap_push_tapped_queue(edt);
2375 /* Run the read filter if we have one. */
2377 passed = dfilter_apply_edt(cf->rfcode, edt);
2381 /* We're not running a display filter and we're not printing any
2382 packet information, so we don't need to do a dissection, and all
2383 packets are processed. */
2389 /* Count this packet. */
2394 /* Process this packet. */
2396 /* We're writing to a capture file; write this packet. */
2397 if (!wtap_dump(pdh, whdr, pseudo_header, pd, err))
2400 if (print_packet_counts) {
2401 /* We're printing packet counts. */
2402 if (ld.packet_count != 0) {
2403 fprintf(stderr, "\r%u ", ld.packet_count);
2404 /* stderr could be line buffered */
2410 if (print_packet_info) {
2411 /* We're printing packet information; print the information for
2413 print_packet(cf, edt);
2415 /* The ANSI C standard does not appear to *require* that a line-buffered
2416 stream be flushed to the host environment whenever a newline is
2417 written, it just says that, on such a stream, characters "are
2418 intended to be transmitted to or from the host environment as a
2419 block when a new-line character is encountered".
2421 The Visual C++ 6.0 C implementation doesn't do what is intended;
2422 even if you set a stream to be line-buffered, it still doesn't
2423 flush the buffer at the end of every line.
2425 So, if the "-l" flag was specified, we flush the standard output
2426 at the end of a packet. This will do the right thing if we're
2427 printing packet summary lines, and, as we print the entire protocol
2428 tree for a single packet without waiting for anything to happen,
2429 it should be as good as line-buffered mode if we're printing
2430 protocol trees. (The whole reason for the "-l" flag in either
2431 tcpdump or Tethereal is to allow the output of a live capture to
2432 be piped to a program or script and to have that script see the
2433 information for the packet as soon as it's printed, rather than
2434 having to wait until a standard I/O buffer fills up. */
2438 if (ferror(stdout)) {
2439 show_print_file_io_error(errno);
2445 if (do_dissection) {
2446 epan_dissect_free(edt);
2447 clear_fdata(&fdata);
2453 show_capture_file_io_error(const char *fname, int err, gboolean is_close)
2462 "tethereal: Not all the packets could be written to \"%s\" because there is "
2463 "no space left on the file system.\n",
2470 "tethereal: Not all the packets could be written to \"%s\" because you are "
2471 "too close to, or over your disk quota.\n",
2476 case WTAP_ERR_CANT_CLOSE:
2478 "tethereal: \"%s\" couldn't be closed for some unknown reason.\n",
2482 case WTAP_ERR_SHORT_WRITE:
2484 "tethereal: Not all the packets could be written to \"%s\".\n",
2491 "tethereal: \"%s\" could not be closed: %s.\n",
2492 fname, wtap_strerror(err));
2495 "tethereal: An error occurred while writing to \"%s\": %s.\n",
2496 fname, wtap_strerror(err));
2503 write_preamble(capture_file *cf)
2505 switch (output_action) {
2508 return print_preamble(print_stream, cf->filename);
2513 write_pdml_preamble(stdout);
2515 write_psml_preamble(stdout);
2516 return !ferror(stdout);
2519 g_assert_not_reached();
2525 get_line_buf(size_t len)
2527 static char *line_bufp = NULL;
2528 static size_t line_buf_len = 256;
2529 size_t new_line_buf_len;
2531 for (new_line_buf_len = line_buf_len; len > new_line_buf_len;
2532 new_line_buf_len *= 2)
2534 if (line_bufp == NULL) {
2535 line_buf_len = new_line_buf_len;
2536 line_bufp = g_malloc(line_buf_len + 1);
2538 if (new_line_buf_len > line_buf_len) {
2539 line_buf_len = new_line_buf_len;
2540 line_bufp = g_realloc(line_bufp, line_buf_len + 1);
2547 print_columns(capture_file *cf)
2554 line_bufp = get_line_buf(256);
2557 for (i = 0; i < cf->cinfo.num_cols; i++) {
2558 switch (cf->cinfo.col_fmt[i]) {
2562 * Don't print this if we're doing a live capture from a network
2563 * interface - if we're doing a live capture, you won't be
2564 * able to look at the capture in the future (it's not being
2565 * saved anywhere), so the frame numbers are unlikely to be
2568 * (XXX - it might be nice to be able to save and print at
2569 * the same time, sort of like an "Update list of packets
2570 * in real time" capture in Ethereal.)
2572 if (capture_opts.iface != NULL)
2575 column_len = strlen(cf->cinfo.col_data[i]);
2578 line_bufp = get_line_buf(buf_offset + column_len);
2579 sprintf(line_bufp + buf_offset, "%3s", cf->cinfo.col_data[i]);
2585 case COL_ABS_DATE_TIME: /* XXX - wider */
2586 column_len = strlen(cf->cinfo.col_data[i]);
2587 if (column_len < 10)
2589 line_bufp = get_line_buf(buf_offset + column_len);
2590 sprintf(line_bufp + buf_offset, "%10s", cf->cinfo.col_data[i]);
2596 case COL_DEF_DL_SRC:
2597 case COL_RES_DL_SRC:
2598 case COL_UNRES_DL_SRC:
2599 case COL_DEF_NET_SRC:
2600 case COL_RES_NET_SRC:
2601 case COL_UNRES_NET_SRC:
2602 column_len = strlen(cf->cinfo.col_data[i]);
2603 if (column_len < 12)
2605 line_bufp = get_line_buf(buf_offset + column_len);
2606 sprintf(line_bufp + buf_offset, "%12s", cf->cinfo.col_data[i]);
2612 case COL_DEF_DL_DST:
2613 case COL_RES_DL_DST:
2614 case COL_UNRES_DL_DST:
2615 case COL_DEF_NET_DST:
2616 case COL_RES_NET_DST:
2617 case COL_UNRES_NET_DST:
2618 column_len = strlen(cf->cinfo.col_data[i]);
2619 if (column_len < 12)
2621 line_bufp = get_line_buf(buf_offset + column_len);
2622 sprintf(line_bufp + buf_offset, "%-12s", cf->cinfo.col_data[i]);
2626 column_len = strlen(cf->cinfo.col_data[i]);
2627 line_bufp = get_line_buf(buf_offset + column_len);
2628 strcat(line_bufp + buf_offset, cf->cinfo.col_data[i]);
2631 buf_offset += column_len;
2632 if (i != cf->cinfo.num_cols - 1) {
2634 * This isn't the last column, so we need to print a
2635 * separator between this column and the next.
2637 * If we printed a network source and are printing a
2638 * network destination of the same type next, separate
2639 * them with "->"; if we printed a network destination
2640 * and are printing a network source of the same type
2641 * next, separate them with "<-"; otherwise separate them
2644 * We add enough space to the buffer for " <- " or " -> ",
2645 * even if we're only adding " ".
2647 line_bufp = get_line_buf(buf_offset + 4);
2648 switch (cf->cinfo.col_fmt[i]) {
2653 switch (cf->cinfo.col_fmt[i + 1]) {
2658 strcat(line_bufp + buf_offset, " -> ");
2663 strcat(line_bufp + buf_offset, " ");
2669 case COL_DEF_DL_SRC:
2670 case COL_RES_DL_SRC:
2671 case COL_UNRES_DL_SRC:
2672 switch (cf->cinfo.col_fmt[i + 1]) {
2674 case COL_DEF_DL_DST:
2675 case COL_RES_DL_DST:
2676 case COL_UNRES_DL_DST:
2677 strcat(line_bufp + buf_offset, " -> ");
2682 strcat(line_bufp + buf_offset, " ");
2688 case COL_DEF_NET_SRC:
2689 case COL_RES_NET_SRC:
2690 case COL_UNRES_NET_SRC:
2691 switch (cf->cinfo.col_fmt[i + 1]) {
2693 case COL_DEF_NET_DST:
2694 case COL_RES_NET_DST:
2695 case COL_UNRES_NET_DST:
2696 strcat(line_bufp + buf_offset, " -> ");
2701 strcat(line_bufp + buf_offset, " ");
2710 switch (cf->cinfo.col_fmt[i + 1]) {
2715 strcat(line_bufp + buf_offset, " <- ");
2720 strcat(line_bufp + buf_offset, " ");
2726 case COL_DEF_DL_DST:
2727 case COL_RES_DL_DST:
2728 case COL_UNRES_DL_DST:
2729 switch (cf->cinfo.col_fmt[i + 1]) {
2731 case COL_DEF_DL_SRC:
2732 case COL_RES_DL_SRC:
2733 case COL_UNRES_DL_SRC:
2734 strcat(line_bufp + buf_offset, " <- ");
2739 strcat(line_bufp + buf_offset, " ");
2745 case COL_DEF_NET_DST:
2746 case COL_RES_NET_DST:
2747 case COL_UNRES_NET_DST:
2748 switch (cf->cinfo.col_fmt[i + 1]) {
2750 case COL_DEF_NET_SRC:
2751 case COL_RES_NET_SRC:
2752 case COL_UNRES_NET_SRC:
2753 strcat(line_bufp + buf_offset, " <- ");
2758 strcat(line_bufp + buf_offset, " ");
2765 strcat(line_bufp + buf_offset, " ");
2771 return print_line(print_stream, 0, line_bufp);
2775 print_packet(capture_file *cf, epan_dissect_t *edt)
2777 print_args_t print_args;
2780 /* Print the information in the protocol tree. */
2781 switch (output_action) {
2784 print_args.to_file = TRUE;
2785 print_args.format = print_format;
2786 print_args.print_summary = !verbose;
2787 print_args.print_hex = verbose && print_hex;
2788 print_args.print_formfeed = FALSE;
2789 print_args.print_dissections = verbose ? print_dissections_expanded : print_dissections_none;
2791 /* init the packet range */
2792 packet_range_init(&print_args.range);
2794 if (!proto_tree_print(&print_args, edt, print_stream))
2797 /* "print_hex_data()" will put out a leading blank line, as well
2798 as a trailing one; print one here, to separate the packets,
2799 only if "print_hex_data()" won't be called. */
2800 if (!print_line(print_stream, 0, ""))
2806 proto_tree_write_pdml(edt, stdout);
2808 return !ferror(stdout);
2811 /* Just fill in the columns. */
2812 epan_dissect_fill_in_columns(edt);
2814 /* Now print them. */
2815 switch (output_action) {
2818 if (!print_columns(cf))
2823 proto_tree_write_psml(edt, stdout);
2824 return !ferror(stdout);
2828 if (!print_hex_data(print_stream, edt))
2830 if (!print_line(print_stream, 0, ""))
2839 switch (output_action) {
2842 return print_finale(print_stream);
2847 write_pdml_finale(stdout);
2849 write_psml_finale(stdout);
2850 return !ferror(stdout);
2853 g_assert_not_reached();
2859 show_print_file_io_error(int err)
2865 "tethereal: Not all the packets could be printed because there is "
2866 "no space left on the file system.\n");
2872 "tethereal: Not all the packets could be printed because you are "
2873 "too close to, or over your disk quota.\n");
2879 "tethereal: An error occurred while printing packets: %s.\n",
2886 cf_open_error_message(int err, gchar *err_info, gboolean for_writing,
2890 static char errmsg_errno[1024+1];
2893 /* Wiretap error. */
2896 case WTAP_ERR_NOT_REGULAR_FILE:
2897 errmsg = "The file \"%s\" is a \"special file\" or socket or other non-regular file.";
2900 case WTAP_ERR_FILE_UNKNOWN_FORMAT:
2901 /* Seen only when opening a capture file for reading. */
2902 errmsg = "The file \"%s\" isn't a capture file in a format Tethereal understands.";
2905 case WTAP_ERR_UNSUPPORTED:
2906 /* Seen only when opening a capture file for reading. */
2907 g_snprintf(errmsg_errno, sizeof(errmsg_errno),
2908 "The file \"%%s\" isn't a capture file in a format Tethereal understands.\n"
2911 errmsg = errmsg_errno;
2914 case WTAP_ERR_CANT_WRITE_TO_PIPE:
2915 /* Seen only when opening a capture file for writing. */
2916 g_snprintf(errmsg_errno, sizeof(errmsg_errno),
2917 "The file \"%%s\" is a pipe, and %s capture files can't be "
2918 "written to a pipe.", wtap_file_type_string(file_type));
2919 errmsg = errmsg_errno;
2922 case WTAP_ERR_UNSUPPORTED_FILE_TYPE:
2923 /* Seen only when opening a capture file for writing. */
2924 errmsg = "Tethereal doesn't support writing capture files in that format.";
2927 case WTAP_ERR_UNSUPPORTED_ENCAP:
2929 errmsg = "Tethereal can't save this capture in that format.";
2931 g_snprintf(errmsg_errno, sizeof(errmsg_errno),
2932 "The file \"%%s\" is a capture for a network type that Tethereal doesn't support.\n"
2935 errmsg = errmsg_errno;
2939 case WTAP_ERR_ENCAP_PER_PACKET_UNSUPPORTED:
2941 errmsg = "Tethereal can't save this capture in that format.";
2943 errmsg = "The file \"%s\" is a capture for a network type that Tethereal doesn't support.";
2946 case WTAP_ERR_BAD_RECORD:
2947 /* Seen only when opening a capture file for reading. */
2948 g_snprintf(errmsg_errno, sizeof(errmsg_errno),
2949 "The file \"%%s\" appears to be damaged or corrupt.\n"
2952 errmsg = errmsg_errno;
2955 case WTAP_ERR_CANT_OPEN:
2957 errmsg = "The file \"%s\" could not be created for some unknown reason.";
2959 errmsg = "The file \"%s\" could not be opened for some unknown reason.";
2962 case WTAP_ERR_SHORT_READ:
2963 errmsg = "The file \"%s\" appears to have been cut short"
2964 " in the middle of a packet or other data.";
2967 case WTAP_ERR_SHORT_WRITE:
2968 errmsg = "A full header couldn't be written to the file \"%s\".";
2972 g_snprintf(errmsg_errno, sizeof(errmsg_errno),
2973 "The file \"%%s\" could not be %s: %s.",
2974 for_writing ? "created" : "opened",
2975 wtap_strerror(err));
2976 errmsg = errmsg_errno;
2980 errmsg = file_open_error_message(err, for_writing);
2985 * Open/create errors are reported with an console message in Tethereal.
2988 open_failure_message(const char *filename, int err, gboolean for_writing)
2990 fprintf(stderr, "tethereal: ");
2991 fprintf(stderr, file_open_error_message(err, for_writing), filename);
2992 fprintf(stderr, "\n");
2996 cf_open(capture_file *cf, const char *fname, gboolean is_tempfile, int *err)
3000 char err_msg[2048+1];
3002 wth = wtap_open_offline(fname, err, &err_info, FALSE);
3006 /* The open succeeded. Fill in the information for this file. */
3008 /* Initialize all data structures used for dissection. */
3012 cf->f_datalen = 0; /* not used, but set it anyway */
3014 /* Set the file name because we need it to set the follow stream filter.
3015 XXX - is that still true? We need it for other reasons, though,
3017 cf->filename = g_strdup(fname);
3019 /* Indicate whether it's a permanent or temporary file. */
3020 cf->is_tempfile = is_tempfile;
3022 /* If it's a temporary capture buffer file, mark it as not saved. */
3023 cf->user_saved = !is_tempfile;
3025 cf->cd_t = wtap_file_type(cf->wth);
3027 cf->drops_known = FALSE;
3029 cf->snap = wtap_snapshot_length(cf->wth);
3030 if (cf->snap == 0) {
3031 /* Snapshot length not known. */
3032 cf->has_snap = FALSE;
3033 cf->snap = WTAP_MAX_PACKET_SIZE;
3035 cf->has_snap = TRUE;
3036 nstime_set_zero(&cf->elapsed_time);
3037 nstime_set_zero(&first_ts);
3038 nstime_set_zero(&prev_ts);
3043 g_snprintf(err_msg, sizeof err_msg,
3044 cf_open_error_message(*err, err_info, FALSE, 0), fname);
3045 fprintf(stderr, "tethereal: %s\n", err_msg);
3051 /* Take care of byte order in the libpcap headers read from pipes.
3052 * (function taken from wiretap/libpcap.c) */
3054 adjust_header(loop_data *ldat, struct pcap_hdr *hdr, struct pcaprec_hdr *rechdr)
3056 if (ldat->byte_swapped) {
3057 /* Byte-swap the record header fields. */
3058 rechdr->ts_sec = BSWAP32(rechdr->ts_sec);
3059 rechdr->ts_usec = BSWAP32(rechdr->ts_usec);
3060 rechdr->incl_len = BSWAP32(rechdr->incl_len);
3061 rechdr->orig_len = BSWAP32(rechdr->orig_len);
3064 /* In file format version 2.3, the "incl_len" and "orig_len" fields were
3065 swapped, in order to match the BPF header layout.
3067 Unfortunately, some files were, according to a comment in the "libpcap"
3068 source, written with version 2.3 in their headers but without the
3069 interchanged fields, so if "incl_len" is greater than "orig_len" - which
3070 would make no sense - we assume that we need to swap them. */
3071 if (hdr->version_major == 2 &&
3072 (hdr->version_minor < 3 ||
3073 (hdr->version_minor == 3 && rechdr->incl_len > rechdr->orig_len))) {
3076 temp = rechdr->orig_len;
3077 rechdr->orig_len = rechdr->incl_len;
3078 rechdr->incl_len = temp;
3082 /* Mimic pcap_open_live() for pipe captures
3083 * We check if "pipename" is "-" (stdin) or a FIFO, open it, and read the
3085 * N.B. : we can't read the libpcap formats used in RedHat 6.1 or SuSE 6.3
3086 * because we can't seek on pipes (see wiretap/libpcap.c for details) */
3088 pipe_open_live(char *pipename, struct pcap_hdr *hdr, loop_data *ldat,
3089 char *errmsg, int errmsgl)
3091 struct stat pipe_stat;
3095 unsigned int bytes_read;
3098 * XXX Tethereal blocks until we return
3100 if (strcmp(pipename, "-") == 0)
3101 fd = 0; /* read from stdin */
3103 if (eth_stat(pipename, &pipe_stat) < 0) {
3104 if (errno == ENOENT || errno == ENOTDIR)
3105 ldat->pipe_err = PIPNEXIST;
3107 g_snprintf(errmsg, errmsgl,
3108 "The capture session could not be initiated "
3109 "due to error on pipe: %s", strerror(errno));
3110 ldat->pipe_err = PIPERR;
3114 if (! S_ISFIFO(pipe_stat.st_mode)) {
3115 if (S_ISCHR(pipe_stat.st_mode)) {
3117 * Assume the user specified an interface on a system where
3118 * interfaces are in /dev. Pretend we haven't seen it.
3120 ldat->pipe_err = PIPNEXIST;
3122 g_snprintf(errmsg, errmsgl,
3123 "The capture session could not be initiated because\n"
3124 "\"%s\" is neither an interface nor a pipe", pipename);
3125 ldat->pipe_err = PIPERR;
3129 fd = eth_open(pipename, O_RDONLY, 0000 /* no creation so don't matter */);
3131 g_snprintf(errmsg, errmsgl,
3132 "The capture session could not be initiated "
3133 "due to error on pipe open: %s", strerror(errno));
3134 ldat->pipe_err = PIPERR;
3139 ldat->from_pipe = TRUE;
3141 /* read the pcap header */
3143 while (bytes_read < sizeof magic) {
3144 b = read(fd, ((char *)&magic)+bytes_read, sizeof magic-bytes_read);
3147 g_snprintf(errmsg, errmsgl, "End of file on pipe during open");
3149 g_snprintf(errmsg, errmsgl, "Error on pipe during open: %s",
3158 /* Host that wrote it has our byte order, and was running
3159 a program using either standard or ss990417 libpcap. */
3160 ldat->byte_swapped = FALSE;
3161 ldat->modified = FALSE;
3163 case PCAP_MODIFIED_MAGIC:
3164 /* Host that wrote it has our byte order, but was running
3165 a program using either ss990915 or ss991029 libpcap. */
3166 ldat->byte_swapped = FALSE;
3167 ldat->modified = TRUE;
3169 case PCAP_SWAPPED_MAGIC:
3170 /* Host that wrote it has a byte order opposite to ours,
3171 and was running a program using either standard or
3172 ss990417 libpcap. */
3173 ldat->byte_swapped = TRUE;
3174 ldat->modified = FALSE;
3176 case PCAP_SWAPPED_MODIFIED_MAGIC:
3177 /* Host that wrote it out has a byte order opposite to
3178 ours, and was running a program using either ss990915
3179 or ss991029 libpcap. */
3180 ldat->byte_swapped = TRUE;
3181 ldat->modified = TRUE;
3184 /* Not a "libpcap" type we know about. */
3185 g_snprintf(errmsg, errmsgl, "Unrecognized libpcap format");
3189 /* Read the rest of the header */
3191 while (bytes_read < sizeof(struct pcap_hdr)) {
3192 b = read(fd, ((char *)hdr)+bytes_read,
3193 sizeof(struct pcap_hdr) - bytes_read);
3196 g_snprintf(errmsg, errmsgl, "End of file on pipe during open");
3198 g_snprintf(errmsg, errmsgl, "Error on pipe during open: %s",
3205 if (ldat->byte_swapped) {
3206 /* Byte-swap the header fields about which we care. */
3207 hdr->version_major = BSWAP16(hdr->version_major);
3208 hdr->version_minor = BSWAP16(hdr->version_minor);
3209 hdr->snaplen = BSWAP32(hdr->snaplen);
3210 hdr->network = BSWAP32(hdr->network);
3213 if (hdr->version_major < 2) {
3214 g_snprintf(errmsg, errmsgl, "Unable to read old libpcap format");
3218 ldat->pipe_state = STATE_EXPECT_REC_HDR;
3219 ldat->pipe_err = PIPOK;
3223 ldat->pipe_err = PIPERR;
3228 /* We read one record from the pipe, take care of byte order in the record
3229 * header, write the record in the capture file, and update capture statistics. */
3232 pipe_dispatch(int fd, loop_data *ldat, struct pcap_hdr *hdr,
3233 struct pcaprec_modified_hdr *rechdr, guchar *data,
3234 char *errmsg, int errmsgl)
3236 struct pcap_pkthdr phdr;
3238 enum { PD_REC_HDR_READ, PD_DATA_READ, PD_PIPE_EOF, PD_PIPE_ERR,
3241 switch (ldat->pipe_state) {
3243 case STATE_EXPECT_REC_HDR:
3244 ldat->bytes_to_read = ldat->modified ?
3245 sizeof(struct pcaprec_modified_hdr) : sizeof(struct pcaprec_hdr);
3246 ldat->bytes_read = 0;
3247 ldat->pipe_state = STATE_READ_REC_HDR;
3250 case STATE_READ_REC_HDR:
3251 b = read(fd, ((char *)rechdr)+ldat->bytes_read,
3252 ldat->bytes_to_read - ldat->bytes_read);
3255 result = PD_PIPE_EOF;
3257 result = PD_PIPE_ERR;
3260 if ((ldat->bytes_read += b) < ldat->bytes_to_read)
3262 result = PD_REC_HDR_READ;
3265 case STATE_EXPECT_DATA:
3266 ldat->bytes_read = 0;
3267 ldat->pipe_state = STATE_READ_DATA;
3270 case STATE_READ_DATA:
3271 b = read(fd, data+ldat->bytes_read, rechdr->hdr.incl_len - ldat->bytes_read);
3274 result = PD_PIPE_EOF;
3276 result = PD_PIPE_ERR;
3279 if ((ldat->bytes_read += b) < rechdr->hdr.incl_len)
3281 result = PD_DATA_READ;
3285 g_snprintf(errmsg, errmsgl, "pipe_dispatch: invalid state");
3288 } /* switch (ldat->pipe_state) */
3291 * We've now read as much data as we were expecting, so process it.
3295 case PD_REC_HDR_READ:
3296 /* We've read the header. Take care of byte order. */
3297 adjust_header(ldat, hdr, &rechdr->hdr);
3298 if (rechdr->hdr.incl_len > WTAP_MAX_PACKET_SIZE) {
3299 g_snprintf(errmsg, errmsgl, "Frame %u too long (%d bytes)",
3300 ldat->packet_count+1, rechdr->hdr.incl_len);
3303 ldat->pipe_state = STATE_EXPECT_DATA;
3307 /* Fill in a "struct pcap_pkthdr", and process the packet. */
3308 phdr.ts.tv_sec = rechdr->hdr.ts_sec;
3309 phdr.ts.tv_usec = rechdr->hdr.ts_usec;
3310 phdr.caplen = rechdr->hdr.incl_len;
3311 phdr.len = rechdr->hdr.orig_len;
3313 capture_pcap_cb((u_char *)ldat, &phdr, data);
3315 ldat->pipe_state = STATE_EXPECT_REC_HDR;
3319 ldat->pipe_err = PIPEOF;
3323 g_snprintf(errmsg, errmsgl, "Error reading from pipe: %s",
3330 ldat->pipe_err = PIPERR;
3331 /* Return here rather than inside the switch to prevent GCC warning */
3335 #endif /* HAVE_LIBPCAP */
3338 * General errors are reported with an console message in Tethereal.
3341 failure_message(const char *msg_format, va_list ap)
3343 fprintf(stderr, "tethereal: ");
3344 vfprintf(stderr, msg_format, ap);
3345 fprintf(stderr, "\n");
3349 * Read errors are reported with an console message in Tethereal.
3352 read_failure_message(const char *filename, int err)
3354 fprintf(stderr, "tethereal: An error occurred while reading from the file \"%s\": %s.\n",
3355 filename, strerror(err));