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>
65 #include <wiretap/file_util.h>
68 #include <epan/timestamp.h>
69 #include <epan/packet.h>
71 #include "disabled_protos.h"
72 #include <epan/prefs.h>
73 #include <epan/column.h>
75 #include <epan/addr_resolv.h>
77 #include "clopts_common.h"
78 #include "version_info.h"
79 #include <epan/conversation.h>
80 #include <epan/plugins.h>
82 #include "conditions.h"
83 #include "capture_stop_conditions.h"
84 #include "ringbuffer.h"
85 #include "capture_ui_utils.h"
86 #include <epan/epan_dissect.h>
88 #include <epan/stat_cmd_args.h>
89 #include <epan/timestamp.h>
94 #include "pcap-util.h"
95 #include <wiretap/wtap-capture.h>
96 #include <wiretap/libpcap.h>
98 #include "capture-wpcap.h"
99 #include "capture_errs.h"
102 #endif /* HAVE_LIBPCAP */
103 #include "epan/emem.h"
106 * This is the template for the decode as option; it is shared between the
107 * various functions that output the usage for this parameter.
109 static const gchar decode_as_arg_template[] = "<layer_type>==<selector>,<decode_as_protocol>";
111 static nstime_t first_ts;
112 static nstime_t prev_ts;
113 static GString *comp_info_str, *runtime_info_str;
115 static gboolean print_packet_info; /* TRUE if we're to print packet information */
117 * The way the packet decode is to be written.
120 WRITE_TEXT, /* summary or detail text */
121 WRITE_XML /* PDML or PSML */
122 /* Add CSV and the like here */
124 static output_action_e output_action;
125 static gboolean do_dissection; /* TRUE if we have to dissect each packet */
126 static gboolean verbose;
127 static gboolean print_hex;
128 static gboolean line_buffered;
129 static guint32 cum_bytes = 0;
130 static print_format_e print_format = PR_FMT_TEXT;
131 static print_stream_t *print_stream;
135 * TRUE if we're to print packet counts to keep track of captured packets.
137 static gboolean print_packet_counts;
139 typedef struct _loop_data {
140 gboolean go; /* TRUE as long as we're supposed to keep capturing */
142 gboolean from_pipe; /* TRUE if we are capturing data from a pipe */
144 char *save_file; /* Name of file to which we're writing */
147 gboolean output_to_pipe;
150 gboolean modified; /* TRUE if data in the pipe uses modified pcap headers */
151 gboolean byte_swapped; /* TRUE if data in the pipe is byte swapped */
152 unsigned int bytes_to_read, bytes_read; /* Used by pipe_dispatch */
154 STATE_EXPECT_REC_HDR, STATE_READ_REC_HDR,
155 STATE_EXPECT_DATA, STATE_READ_DATA
157 enum { PIPOK, PIPEOF, PIPERR, PIPNEXIST } pipe_err;
164 static capture_options capture_opts;
168 static gboolean infodelay; /* if TRUE, don't print capture info in SIGINFO handler */
169 static gboolean infoprint; /* if TRUE, print capture info after clearing infodelay */
171 #endif /* HAVE_LIBPCAP */
174 static int capture(char *, int);
175 static void capture_pcap_cb(u_char *, const struct pcap_pkthdr *,
177 static void report_counts(void);
179 static BOOL WINAPI capture_cleanup(DWORD);
181 static void capture_cleanup(int);
183 static void report_counts_siginfo(int);
186 #endif /* HAVE_LIBPCAP */
188 static int load_cap_file(capture_file *, char *, int);
189 static gboolean process_packet(capture_file *cf, wtap_dumper *pdh, long offset,
190 const struct wtap_pkthdr *whdr, union wtap_pseudo_header *pseudo_header,
191 const guchar *pd, int *err);
192 static void show_capture_file_io_error(const char *, int, gboolean);
193 static void show_print_file_io_error(int err);
194 static gboolean write_preamble(capture_file *cf);
195 static gboolean print_packet(capture_file *cf, epan_dissect_t *edt);
196 static gboolean write_finale(void);
197 static const char *cf_open_error_message(int err, gchar *err_info,
198 gboolean for_writing, int file_type);
201 static void adjust_header(loop_data *, struct pcap_hdr *, struct pcaprec_hdr *);
202 static int pipe_open_live(char *, struct pcap_hdr *, loop_data *, char *, int);
203 static int pipe_dispatch(int, loop_data *, struct pcap_hdr *, \
204 struct pcaprec_modified_hdr *, guchar *, char *, int);
208 static void open_failure_message(const char *filename, int err,
209 gboolean for_writing);
210 static void failure_message(const char *msg_format, va_list ap);
211 static void read_failure_message(const char *filename, int err);
217 print_usage(gboolean print_ver)
224 fprintf(output, "This is t" PACKAGE " " VERSION "%s"
225 "\n (C) 1998-2005 Gerald Combs <gerald@ethereal.com>"
228 svnversion, comp_info_str->str, runtime_info_str->str);
233 fprintf(output, "\nt%s [ -vh ] [ -DlLnpqSVx ] [ -a <capture autostop condition> ] ...\n",
235 fprintf(output, "\t[ -b <capture ring buffer option> ] ... [ -c <capture packet count> ]\n");
236 fprintf(output, "\t[ -d %s ] ...\n", decode_as_arg_template);
237 fprintf(output, "\t[ -f <capture filter> ] [ -F <output file type> ]\n");
238 fprintf(output, "\t[ -i <capture interface> ] [ -N <name resolving flags> ]\n");
239 fprintf(output, "\t[ -o <preference setting> ] ... [ -r <infile> ]\n");
240 fprintf(output, "\t[ -R <read (display) filter> ] [ -s <capture snaplen> ]\n");
241 fprintf(output, "\t[ -t <time stamp format> ] [ -T pdml|ps|psml|text ]\n");
242 fprintf(output, "\t[ -w <savefile> ] [ -y <capture link type> ] [ -z <statistics> ]\n");
244 fprintf(output, "\nt%s [ -vh ] [ -lnVx ]\n", PACKAGE);
245 fprintf(output, "\t[ -d %s ] ...\n", decode_as_arg_template);
246 fprintf(output, "\t[ -F <output file type> ] [ -N <name resolving flags> ]\n");
247 fprintf(output, "\t[ -o <preference setting> ] ... [ -r <infile> ]\n");
248 fprintf(output, "\t[ -R <read (display) filter> ] \t[ -t <time stamp format> ]\n");
249 fprintf(output, "\t[ -T pdml|ps|psml|text ] [ -w <savefile> ] [ -z <statistics ]\n");
251 fprintf(output, "Valid file type arguments to the \"-F\" flag:\n");
252 for (i = 0; i < WTAP_NUM_FILE_TYPES; i++) {
253 if (wtap_dump_can_open(i))
254 fprintf(output, "\t%s - %s\n",
255 wtap_file_type_short_string(i), wtap_file_type_string(i));
257 fprintf(output, "\tdefault is libpcap\n");
261 * For a dissector table, print on the stream described by output,
262 * its short name (which is what's used in the "-d" option) and its
266 display_dissector_table_names(char *table_name, const char *ui_name,
269 fprintf((FILE *)output, "\t%s (%s)\n", table_name, ui_name);
273 * For a dissector handle, print on the stream described by output,
274 * the filter name (which is what's used in the "-d" option) and the full
275 * name for the protocol that corresponds to this handle.
278 display_dissector_names(const gchar *table _U_, gpointer handle, gpointer output)
281 const gchar* proto_filter_name;
282 const gchar* proto_ui_name;
284 proto_id = dissector_handle_get_protocol_index((dissector_handle_t)handle);
286 if (proto_id != -1) {
287 proto_filter_name = proto_get_protocol_filter_name(proto_id);
288 proto_ui_name = proto_get_protocol_name(proto_id);
289 g_assert(proto_filter_name != NULL);
290 g_assert(proto_ui_name != NULL);
292 fprintf((FILE *)output, "\t%s (%s)\n",
299 * The protocol_name_search structure is used by find_protocol_name_func()
300 * to pass parameters and store results
302 struct protocol_name_search{
303 gchar *searched_name; /* Protocol filter name we are looking for */
304 dissector_handle_t matched_handle; /* Handle for a dissector whose protocol has the specified filter name */
305 guint nb_match; /* How many dissectors matched searched_name */
307 typedef struct protocol_name_search *protocol_name_search_t;
310 * This function parses all dissectors associated with a table to find the
311 * one whose protocol has the specified filter name. It is called
312 * as a reference function in a call to dissector_table_foreach_handle.
313 * The name we are looking for, as well as the results, are stored in the
314 * protocol_name_search struct pointed to by user_data.
315 * If called using dissector_table_foreach_handle, we actually parse the
316 * whole list of dissectors.
319 find_protocol_name_func(const gchar *table _U_, gpointer handle, gpointer user_data)
323 const gchar *protocol_filter_name;
324 protocol_name_search_t search_info;
328 search_info = (protocol_name_search_t)user_data;
330 proto_id = dissector_handle_get_protocol_index((dissector_handle_t)handle);
331 if (proto_id != -1) {
332 protocol_filter_name = proto_get_protocol_filter_name(proto_id);
333 g_assert(protocol_filter_name != NULL);
334 if (strcmp(protocol_filter_name, search_info->searched_name) == 0) {
336 if (search_info->nb_match == 0) {
337 /* Record this handle only if this is the first match */
338 search_info->matched_handle = (dissector_handle_t)handle; /* Record the handle for this matching dissector */
340 search_info->nb_match++;
346 * Print all layer type names supported.
347 * We send the output to the stream described by the handle output.
351 fprint_all_layer_types(FILE *output)
354 dissector_all_tables_foreach_table(display_dissector_table_names, (gpointer)output);
358 * Print all protocol names supported for a specific layer type.
359 * table_name contains the layer type name in which the search is performed.
360 * We send the output to the stream described by the handle output.
364 fprint_all_protocols_for_layer_types(FILE *output, gchar *table_name)
367 dissector_table_foreach_handle(table_name,
368 display_dissector_names,
373 * The function below parses the command-line parameters for the decode as
374 * feature (a string pointer by cl_param).
375 * It checks the format of the command-line, searches for a matching table
376 * and dissector. If a table/dissector match is not found, we display a
377 * summary of the available tables/dissectors (on stderr) and return FALSE.
378 * If everything is fine, we get the "Decode as" preference activated,
379 * then we return TRUE.
382 add_decode_as(const gchar *cl_param)
386 gchar *decoded_param;
387 gchar *remaining_param;
389 gchar *dissector_str;
390 dissector_handle_t dissector_matching;
391 dissector_table_t table_matching;
392 ftenum_t dissector_table_selector_type;
393 struct protocol_name_search user_protocol_name;
395 /* The following code will allocate and copy the command-line options in a string pointed by decoded_param */
398 decoded_param = g_malloc( sizeof(gchar) * (strlen(cl_param) + 1) ); /* Allocate enough space to have a working copy of the command-line parameter */
399 g_assert(decoded_param);
400 strcpy(decoded_param, cl_param);
403 /* The lines below will parse this string (modifying it) to extract all
404 necessary information. Note that decoded_param is still needed since
405 strings are not copied - we just save pointers. */
407 /* This section extracts a layer type (table_name) from decoded_param */
408 table_name = decoded_param; /* Layer type string starts from beginning */
410 remaining_param = strchr(table_name, '=');
411 if (remaining_param == NULL) {
412 fprintf(stderr, "tethereal: Parameter \"%s\" doesn't follow the template \"%s\"\n", cl_param, decode_as_arg_template);
413 /* If the argument does not follow the template, carry on anyway to check
414 if the table name is at least correct. If remaining_param is NULL,
415 we'll exit anyway further down */
418 *remaining_param = '\0'; /* Terminate the layer type string (table_name) where '=' was detected */
421 /* Remove leading and trailing spaces from the table name */
422 while ( table_name[0] == ' ' )
424 while ( table_name[strlen(table_name) - 1] == ' ' )
425 table_name[strlen(table_name) - 1] = '\0'; /* Note: if empty string, while loop will eventually exit */
427 /* The following part searches a table matching with the layer type specified */
428 table_matching = NULL;
430 /* Look for the requested table */
431 if ( !(*(table_name)) ) { /* Is the table name empty, if so, don't even search for anything, display a message */
432 fprintf(stderr, "tethereal: No layer type specified\n"); /* Note, we don't exit here, but table_matching will remain NULL, so we exit below */
435 table_matching = find_dissector_table(table_name);
436 if (!table_matching) {
437 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 */
441 if (!table_matching) {
442 /* Display a list of supported layer types to help the user, if the
443 specified layer type was not found */
444 fprintf(stderr, "tethereal: Valid layer types are:\n");
445 fprint_all_layer_types(stderr);
447 if (remaining_param == NULL || !table_matching) {
448 /* Exit if the layer type was not found, or if no '=' separator was found
450 g_free(decoded_param);
454 if (*(remaining_param + 1) != '=') { /* Check for "==" and not only '=' */
455 fprintf(stderr, "tethereal: WARNING: -d requires \"==\" instead of \"=\". Option will be treated as \"%s==%s\"\n", table_name, remaining_param + 1);
458 remaining_param++; /* Move to the second '=' */
459 *remaining_param = '\0'; /* Remove the second '=' */
461 remaining_param++; /* Position after the layer type string */
463 /* This section extracts a selector value (selector_str) from decoded_param */
465 selector_str = remaining_param; /* Next part starts with the selector number */
467 remaining_param = strchr(selector_str, ',');
468 if (remaining_param == NULL) {
469 fprintf(stderr, "tethereal: Parameter \"%s\" doesn't follow the template \"%s\"\n", cl_param, decode_as_arg_template);
470 /* If the argument does not follow the template, carry on anyway to check
471 if the selector value is at least correct. If remaining_param is NULL,
472 we'll exit anyway further down */
475 *remaining_param = '\0'; /* Terminate the selector number string (selector_str) where ',' was detected */
478 dissector_table_selector_type = get_dissector_table_selector_type(table_name);
480 switch (dissector_table_selector_type) {
486 /* The selector for this table is an unsigned number. Parse it as such.
487 There's no need to remove leading and trailing spaces from the
488 selector number string, because sscanf will do that for us. */
489 if ( sscanf(selector_str, "%u", &selector) != 1 ) {
490 fprintf(stderr, "tethereal: Invalid selector number \"%s\"\n", selector_str);
491 g_free(decoded_param);
498 /* The selector for this table is a string. */
502 /* There are currently no dissector tables with any types other
503 than the ones listed above. */
504 g_assert_not_reached();
507 if (remaining_param == NULL) {
508 /* Exit if no ',' separator was found (see above) */
509 fprintf(stderr, "tethereal: Valid protocols for layer type \"%s\" are:\n", table_name);
510 fprint_all_protocols_for_layer_types(stderr, table_name);
511 g_free(decoded_param);
515 remaining_param++; /* Position after the selector number string */
517 /* This section extracts a protocol filter name (dissector_str) from decoded_param */
519 dissector_str = remaining_param; /* All the rest of the string is the dissector (decode as protocol) name */
521 /* Remove leading and trailing spaces from the dissector name */
522 while ( dissector_str[0] == ' ' )
524 while ( dissector_str[strlen(dissector_str) - 1] == ' ' )
525 dissector_str[strlen(dissector_str) - 1] = '\0'; /* Note: if empty string, while loop will eventually exit */
527 dissector_matching = NULL;
529 /* We now have a pointer to the handle for the requested table inside the variable table_matching */
530 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 */
531 fprintf(stderr, "tethereal: No protocol name specified\n"); /* Note, we don't exit here, but dissector_matching will remain NULL, so we exit below */
534 user_protocol_name.nb_match = 0;
535 user_protocol_name.searched_name = dissector_str;
536 user_protocol_name.matched_handle = NULL;
538 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 */
540 if (user_protocol_name.nb_match != 0) {
541 dissector_matching = user_protocol_name.matched_handle;
542 if (user_protocol_name.nb_match > 1) {
543 fprintf(stderr, "tethereal: WARNING: Protocol \"%s\" matched %u dissectors, first one will be used\n", dissector_str, user_protocol_name.nb_match);
547 /* OK, check whether the problem is that there isn't any such
548 protocol, or that there is but it's not specified as a protocol
549 that's valid for that dissector table.
550 Note, we don't exit here, but dissector_matching will remain NULL,
552 if (proto_get_id_by_filter_name(dissector_str) == -1) {
553 /* No such protocol */
554 fprintf(stderr, "tethereal: Unknown protocol -- \"%s\"\n", dissector_str);
556 fprintf(stderr, "tethereal: Protocol \"%s\" isn't valid for layer type \"%s\"\n",
557 dissector_str, table_name);
562 if (!dissector_matching) {
563 fprintf(stderr, "tethereal: Valid protocols for layer type \"%s\" are:\n", table_name);
564 fprint_all_protocols_for_layer_types(stderr, table_name);
565 g_free(decoded_param);
569 /* This is the end of the code that parses the command-line options.
570 All information is now stored in the variables:
574 The above variables that are strings are still pointing to areas within
575 decoded_parm. decoded_parm thus still needs to be kept allocated in
576 until we stop needing these variables
577 decoded_param will be deallocated at each exit point of this function */
580 /* We now have a pointer to the handle for the requested dissector
581 (requested protocol) inside the variable dissector_matching */
582 switch (dissector_table_selector_type) {
588 /* The selector for this table is an unsigned number. */
589 dissector_change(table_name, selector, dissector_matching);
594 /* The selector for this table is a string. */
595 dissector_change_string(table_name, selector_str, dissector_matching);
599 /* There are currently no dissector tables with any types other
600 than the ones listed above. */
601 g_assert_not_reached();
603 g_free(decoded_param); /* "Decode As" rule has been succesfully added */
608 main(int argc, char *argv[])
612 gboolean arg_error = FALSE;
618 char *gpf_path, *pf_path;
619 char *gdp_path, *dp_path;
620 int gpf_open_errno, gpf_read_errno;
621 int pf_open_errno, pf_read_errno;
622 int gdp_open_errno, gdp_read_errno;
623 int dp_open_errno, dp_read_errno;
626 gboolean capture_filter_specified = FALSE;
627 GList *if_list, *if_entry;
631 gchar err_str[PCAP_ERRBUF_SIZE];
632 gchar *cant_get_if_list_errstr;
633 gboolean list_link_layer_types = FALSE;
635 gboolean capture_option_specified = FALSE;
637 gboolean quiet = FALSE;
638 gchar *save_file = NULL;
639 int out_file_type = WTAP_FILE_PCAP;
640 gchar *cf_name = NULL, *rfilter = NULL;
642 gboolean start_capture = FALSE;
644 GList *lt_list, *lt_entry;
645 data_link_info_t *data_link_info;
647 #ifdef HAVE_PCAP_OPEN_DEAD
648 struct bpf_program fcode;
650 dfilter_t *rfcode = NULL;
654 /* initialize memory allocation subsystem */
659 capture_opts_init(&capture_opts, NULL /* cfile */);
662 timestamp_set_type(TS_RELATIVE);
663 timestamp_set_precision(TS_PREC_AUTO);
665 /* Register all dissectors; we must do this before checking for the
666 "-G" flag, as the "-G" flag dumps information registered by the
667 dissectors, and we must do it before we read the preferences, in
668 case any dissectors register preferences. */
669 epan_init(PLUGIN_DIR,register_all_protocols,register_all_protocol_handoffs,
670 failure_message,open_failure_message,read_failure_message);
672 /* Register all tap listeners; we do this before we parse the arguments,
673 as the "-z" argument can specify a registered tap. */
675 /* we register the plugin taps before the other taps because
676 stats_tree taps plugins will be registered as tap listeners
677 by stats_tree_stat.c and need to registered before that */
679 register_all_plugin_tap_listeners();
681 register_all_tap_listeners();
683 /* Now register the preferences for any non-dissector modules.
684 We must do that before we read the preferences as well. */
685 prefs_register_modules();
687 /* If invoked with the "-G" flag, we dump out information based on
688 the argument to the "-G" flag; if no argument is specified,
689 for backwards compatibility we dump out a glossary of display
692 We do this here to mirror what happens in the GTK+ version, although
693 it's not necessary here. */
694 handle_dashG_option(argc, argv, "tethereal");
696 /* Set the C-language locale to the native environment. */
697 setlocale(LC_ALL, "");
699 prefs = read_prefs(&gpf_open_errno, &gpf_read_errno, &gpf_path,
700 &pf_open_errno, &pf_read_errno, &pf_path);
701 if (gpf_path != NULL) {
702 if (gpf_open_errno != 0) {
703 fprintf(stderr, "Can't open global preferences file \"%s\": %s.\n",
704 pf_path, strerror(gpf_open_errno));
706 if (gpf_read_errno != 0) {
707 fprintf(stderr, "I/O error reading global preferences file \"%s\": %s.\n",
708 pf_path, strerror(gpf_read_errno));
711 if (pf_path != NULL) {
712 if (pf_open_errno != 0) {
713 fprintf(stderr, "Can't open your preferences file \"%s\": %s.\n", pf_path,
714 strerror(pf_open_errno));
716 if (pf_read_errno != 0) {
717 fprintf(stderr, "I/O error reading your preferences file \"%s\": %s.\n",
718 pf_path, strerror(pf_read_errno));
724 /* Set the name resolution code's flags from the preferences. */
725 g_resolv_flags = prefs->name_resolve;
727 /* Read the disabled protocols file. */
728 read_disabled_protos_list(&gdp_path, &gdp_open_errno, &gdp_read_errno,
729 &dp_path, &dp_open_errno, &dp_read_errno);
730 if (gdp_path != NULL) {
731 if (gdp_open_errno != 0) {
733 "Could not open global disabled protocols file\n\"%s\": %s.\n",
734 gdp_path, strerror(gdp_open_errno));
736 if (gdp_read_errno != 0) {
738 "I/O error reading global disabled protocols file\n\"%s\": %s.\n",
739 gdp_path, strerror(gdp_read_errno));
743 if (dp_path != NULL) {
744 if (dp_open_errno != 0) {
746 "Could not open your disabled protocols file\n\"%s\": %s.\n", dp_path,
747 strerror(dp_open_errno));
749 if (dp_read_errno != 0) {
751 "I/O error reading your disabled protocols file\n\"%s\": %s.\n", dp_path,
752 strerror(dp_read_errno));
758 /* Load Wpcap, if possible */
762 init_cap_file(&cfile);
764 /* Assemble the compile-time version information string */
765 comp_info_str = g_string_new("Compiled ");
766 get_compiled_version_info(comp_info_str);
768 /* Assemble the run-time version information string */
769 runtime_info_str = g_string_new("Running ");
770 get_runtime_version_info(runtime_info_str);
772 /* Print format defaults to this. */
773 print_format = PR_FMT_TEXT;
775 /* Now get our args */
776 while ((opt = getopt(argc, argv, "a:b:c:d:Df:F:hi:lLnN:o:pqr:R:s:St:T:vw:Vxy:z:")) != -1) {
778 case 'a': /* autostop criteria */
779 case 'b': /* Ringbuffer option */
780 case 'c': /* Capture xxx packets */
781 case 'f': /* capture filter */
782 case 'p': /* Don't capture in promiscuous mode */
783 case 's': /* Set the snapshot (capture) length */
784 case 'y': /* Set the pcap data link type */
786 capture_opts_add_opt(&capture_opts, "tethereal", opt, optarg, &start_capture);
788 capture_option_specified = TRUE;
792 case 'd': /* Decode as rule */
793 if (!add_decode_as(optarg))
796 case 'D': /* Print a list of capture devices */
798 if_list = get_interface_list(&err, err_str);
799 if (if_list == NULL) {
802 case CANT_GET_INTERFACE_LIST:
803 cant_get_if_list_errstr =
804 cant_get_if_list_error_message(err_str);
805 fprintf(stderr, "tethereal: %s\n", cant_get_if_list_errstr);
806 g_free(cant_get_if_list_errstr);
809 case NO_INTERFACES_FOUND:
810 fprintf(stderr, "tethereal: There are no interfaces on which a capture can be done\n");
815 i = 1; /* Interface id number */
816 for (if_entry = g_list_first(if_list); if_entry != NULL;
817 if_entry = g_list_next(if_entry)) {
818 if_info = if_entry->data;
819 printf("%d. %s", i++, if_info->name);
820 if (if_info->description != NULL)
821 printf(" (%s)", if_info->description);
824 free_interface_list(if_list);
827 capture_option_specified = TRUE;
832 out_file_type = wtap_short_string_to_file_type(optarg);
833 if (out_file_type < 0) {
834 fprintf(stderr, "tethereal: \"%s\" isn't a valid capture file type\n",
839 case 'h': /* Print help and exit */
843 case 'i': /* Use interface xxx */
846 * If the argument is a number, treat it as an index into the list
847 * of adapters, as printed by "tethereal -D".
849 * This should be OK on UNIX systems, as interfaces shouldn't have
850 * names that begin with digits. It can be useful on Windows, where
851 * more than one interface can have the same name.
853 adapter_index = strtol(optarg, &p, 10);
854 if (p != NULL && *p == '\0') {
855 if (adapter_index < 0) {
857 "tethereal: The specified adapter index is a negative number\n");
860 if (adapter_index > INT_MAX) {
862 "tethereal: The specified adapter index is too large (greater than %d)\n",
866 if (adapter_index == 0) {
867 fprintf(stderr, "tethereal: there is no interface with that adapter index\n");
870 if_list = get_interface_list(&err, err_str);
871 if (if_list == NULL) {
874 case CANT_GET_INTERFACE_LIST:
875 cant_get_if_list_errstr =
876 cant_get_if_list_error_message(err_str);
877 fprintf(stderr, "tethereal: %s\n", cant_get_if_list_errstr);
878 g_free(cant_get_if_list_errstr);
881 case NO_INTERFACES_FOUND:
882 fprintf(stderr, "tethereal: There are no interfaces on which a capture can be done\n");
887 if_info = g_list_nth_data(if_list, adapter_index - 1);
888 if (if_info == NULL) {
889 fprintf(stderr, "tethereal: there is no interface with that adapter index\n");
892 capture_opts.iface = g_strdup(if_info->name);
893 free_interface_list(if_list);
895 capture_opts.iface = g_strdup(optarg);
897 capture_option_specified = TRUE;
901 case 'l': /* "Line-buffer" standard output */
902 /* This isn't line-buffering, strictly speaking, it's just
903 flushing the standard output after the information for
904 each packet is printed; however, that should be good
905 enough for all the purposes to which "-l" is put (and
906 is probably actually better for "-V", as it does fewer
909 See the comment in "process_packet()" for an explanation of
910 why we do that, and why we don't just use "setvbuf()" to
911 make the standard output line-buffered (short version: in
912 Windows, "line-buffered" is the same as "fully-buffered",
913 and the output buffer is only flushed when it fills up). */
914 line_buffered = TRUE;
916 case 'L': /* Print list of link-layer types and exit */
918 list_link_layer_types = TRUE;
921 capture_option_specified = TRUE;
925 case 'n': /* No name resolution */
926 g_resolv_flags = RESOLV_NONE;
928 case 'N': /* Select what types of addresses/port #s to resolve */
929 if (g_resolv_flags == RESOLV_ALL)
930 g_resolv_flags = RESOLV_NONE;
931 badopt = string_to_name_resolve(optarg, &g_resolv_flags);
932 if (badopt != '\0') {
933 fprintf(stderr, "tethereal: -N specifies unknown resolving option '%c'; valid options are 'm', 'n', and 't'\n",
938 case 'o': /* Override preference from command line */
939 switch (prefs_set_pref(optarg)) {
941 case PREFS_SET_SYNTAX_ERR:
942 fprintf(stderr, "tethereal: Invalid -o flag \"%s\"\n", optarg);
946 case PREFS_SET_NO_SUCH_PREF:
947 case PREFS_SET_OBSOLETE:
948 fprintf(stderr, "tethereal: -o flag \"%s\" specifies unknown preference\n",
954 case 'q': /* Quiet */
957 case 'r': /* Read capture file xxx */
958 cf_name = g_strdup(optarg);
960 case 'R': /* Read file filter */
963 case 'S': /* show packets in real time */
964 print_packet_info = TRUE;
966 case 't': /* Time stamp type */
967 if (strcmp(optarg, "r") == 0)
968 timestamp_set_type(TS_RELATIVE);
969 else if (strcmp(optarg, "a") == 0)
970 timestamp_set_type(TS_ABSOLUTE);
971 else if (strcmp(optarg, "ad") == 0)
972 timestamp_set_type(TS_ABSOLUTE_WITH_DATE);
973 else if (strcmp(optarg, "d") == 0)
974 timestamp_set_type(TS_DELTA);
976 fprintf(stderr, "tethereal: Invalid time stamp type \"%s\"\n",
978 fprintf(stderr, "It must be \"r\" for relative, \"a\" for absolute,\n");
979 fprintf(stderr, "\"ad\" for absolute with date, or \"d\" for delta.\n");
983 case 'T': /* printing Type */
984 if (strcmp(optarg, "text") == 0) {
985 output_action = WRITE_TEXT;
986 print_format = PR_FMT_TEXT;
987 } else if (strcmp(optarg, "ps") == 0) {
988 output_action = WRITE_TEXT;
989 print_format = PR_FMT_PS;
990 } else if (strcmp(optarg, "pdml") == 0) {
991 output_action = WRITE_XML;
993 } else if (strcmp(optarg, "psml") == 0) {
994 output_action = WRITE_XML;
997 fprintf(stderr, "tethereal: Invalid -T parameter.\n");
998 fprintf(stderr, "It must be \"ps\", \"text\", \"pdml\", or \"psml\".\n");
1002 case 'v': /* Show version and exit */
1003 printf("t" PACKAGE " " VERSION "%s\n%s\n%s\n",
1004 svnversion, comp_info_str->str, runtime_info_str->str);
1007 case 'w': /* Write to capture file xxx */
1008 save_file = g_strdup(optarg);
1010 case 'V': /* Verbose */
1013 case 'x': /* Print packet data in hex (and ASCII) */
1017 /* We won't call the init function for the stat this soon
1018 as it would disallow MATE's fields (which are registered
1019 by the preferences set callback) from being used as
1020 part of a tap filter. Instead, we just add the argument
1021 to a list of stat arguments. */
1022 if (!process_stat_cmd_arg(optarg)) {
1023 fprintf(stderr,"tethereal: invalid -z argument.\n");
1024 fprintf(stderr," -z argument must be one of :\n");
1025 list_stat_cmd_args();
1030 case '?': /* Bad flag - print usage message */
1036 /* If no capture filter or read filter has been specified, and there are
1037 still command-line arguments, treat them as the tokens of a capture
1038 filter (if no "-r" flag was specified) or a read filter (if a "-r"
1039 flag was specified. */
1040 if (optind < argc) {
1041 if (cf_name != NULL) {
1042 if (rfilter != NULL) {
1044 "tethereal: Read filters were specified both with \"-R\" and with additional command-line arguments\n");
1047 rfilter = get_args_as_string(argc, argv, optind);
1050 if (capture_filter_specified) {
1052 "tethereal: Capture filters were specified both with \"-f\" and with additional command-line arguments\n");
1055 capture_opts.cfilter = get_args_as_string(argc, argv, optind);
1057 capture_option_specified = TRUE;
1062 /* See if we're writing a capture file and the file is a pipe */
1064 ld.output_to_pipe = FALSE;
1066 if (save_file != NULL) {
1067 /* We're writing to a capture file. */
1068 if (strcmp(save_file, "-") == 0) {
1069 /* Write to the standard output. */
1071 save_file = g_strdup("");
1073 /* XXX - should we check whether it's a pipe? It's arguably
1074 silly to do "-w - >output_file" rather than "-w output_file",
1075 but by not checking we might be violating the Principle Of
1076 Least Astonishment. */
1077 ld.output_to_pipe = TRUE;
1082 err = test_for_fifo(save_file);
1085 case ENOENT: /* it doesn't exist, so we'll be creating it,
1086 and it won't be a FIFO */
1087 case 0: /* found it, but it's not a FIFO */
1090 case ESPIPE: /* it is a FIFO */
1091 ld.output_to_pipe = TRUE;
1094 default: /* couldn't stat it */
1096 "tethereal: Error testing whether capture file is a pipe: %s\n",
1103 /* We're not writing to a file, so we should print packet information
1104 unless "-q" was specified. */
1106 print_packet_info = TRUE;
1109 #ifndef HAVE_LIBPCAP
1110 if (capture_option_specified)
1111 fprintf(stderr, "This version of Tethereal was not built with support for capturing packets.\n");
1118 /* We don't support capture filters when reading from a capture file
1119 (the BPF compiler doesn't support all link-layer types that we
1120 support in capture files we read). */
1122 if (cf_name != NULL) {
1123 if (capture_filter_specified) {
1125 "tethereal: Only read filters, not capture filters, can be specified when reading a capture file.\n");
1132 if (output_action != WRITE_TEXT) {
1133 fprintf(stderr, "tethereal: Raw packet hex data can only be printed as text or PostScript\n");
1139 if (list_link_layer_types) {
1140 /* We're supposed to list the link-layer types for an interface;
1141 did the user also specify a capture file to be read? */
1143 /* Yes - that's bogus. */
1144 fprintf(stderr, "tethereal: You can't specify -L and a capture file to be read.\n");
1147 /* No - did they specify a ring buffer option? */
1148 if (capture_opts.multi_files_on) {
1149 fprintf(stderr, "tethereal: Ring buffer requested, but a capture isn't being done.\n");
1153 /* If they didn't specify a "-w" flag, but specified a maximum capture
1154 file size, tell them that this doesn't work, and exit. */
1155 if (capture_opts.has_autostop_filesize && save_file == NULL) {
1156 fprintf(stderr, "tethereal: Maximum capture file size specified, but "
1157 "capture isn't being saved to a file.\n");
1161 if (capture_opts.multi_files_on) {
1162 /* Ring buffer works only under certain conditions:
1163 a) ring buffer does not work if you're not saving the capture to
1165 b) ring buffer only works if you're saving in libpcap format;
1166 c) it makes no sense to enable the ring buffer if the maximum
1167 file size is set to "infinite";
1168 d) file must not be a pipe. */
1169 if (save_file == NULL) {
1170 fprintf(stderr, "tethereal: Ring buffer requested, but "
1171 "capture isn't being saved to a file.\n");
1174 if (out_file_type != WTAP_FILE_PCAP) {
1175 fprintf(stderr, "tethereal: Ring buffer requested, but "
1176 "capture isn't being saved in libpcap format.\n");
1179 if (!capture_opts.has_autostop_filesize) {
1180 fprintf(stderr, "tethereal: Ring buffer requested, but "
1181 "no maximum capture file size was specified.\n");
1184 if (ld.output_to_pipe) {
1185 fprintf(stderr, "tethereal: Ring buffer requested, but "
1186 "capture file is a pipe.\n");
1194 /* Start windows sockets */
1195 WSAStartup( MAKEWORD( 1, 1 ), &wsaData );
1198 /* Notify all registered modules that have had any of their preferences
1199 changed either from one of the preferences file or from the command
1200 line that their preferences have changed. */
1203 /* At this point MATE will have registered its field array so we can
1204 have a tap filter with one of MATE's late-registered fields as part
1205 of the filter. We can now process all the "-z" arguments. */
1206 start_requested_stats();
1208 /* disabled protocols as per configuration file */
1209 if (gdp_path == NULL && dp_path == NULL) {
1210 set_disabled_protos_list();
1213 /* Build the column format array */
1214 col_setup(&cfile.cinfo, prefs->num_cols);
1215 for (i = 0; i < cfile.cinfo.num_cols; i++) {
1216 cfile.cinfo.col_fmt[i] = get_column_format(i);
1217 cfile.cinfo.col_title[i] = g_strdup(get_column_title(i));
1218 cfile.cinfo.fmt_matx[i] = (gboolean *) g_malloc0(sizeof(gboolean) *
1220 get_column_format_matches(cfile.cinfo.fmt_matx[i], cfile.cinfo.col_fmt[i]);
1221 cfile.cinfo.col_data[i] = NULL;
1222 if (cfile.cinfo.col_fmt[i] == COL_INFO)
1223 cfile.cinfo.col_buf[i] = (gchar *) g_malloc(sizeof(gchar) * COL_MAX_INFO_LEN);
1225 cfile.cinfo.col_buf[i] = (gchar *) g_malloc(sizeof(gchar) * COL_MAX_LEN);
1226 cfile.cinfo.col_fence[i] = 0;
1227 cfile.cinfo.col_expr[i] = (gchar *) g_malloc(sizeof(gchar) * COL_MAX_LEN);
1228 cfile.cinfo.col_expr_val[i] = (gchar *) g_malloc(sizeof(gchar) * COL_MAX_LEN);
1231 for (i = 0; i < cfile.cinfo.num_cols; i++) {
1234 for (j = 0; j < NUM_COL_FMTS; j++) {
1235 if (!cfile.cinfo.fmt_matx[i][j])
1238 if (cfile.cinfo.col_first[j] == -1)
1239 cfile.cinfo.col_first[j] = i;
1240 cfile.cinfo.col_last[j] = i;
1245 if (capture_opts.snaplen < 1)
1246 capture_opts.snaplen = WTAP_MAX_PACKET_SIZE;
1247 else if (capture_opts.snaplen < MIN_PACKET_SIZE)
1248 capture_opts.snaplen = MIN_PACKET_SIZE;
1250 /* Check the value range of the ring_num_files parameter */
1251 if (capture_opts.ring_num_files > RINGBUFFER_MAX_NUM_FILES)
1252 capture_opts.ring_num_files = RINGBUFFER_MAX_NUM_FILES;
1253 #if RINGBUFFER_MIN_NUM_FILES > 0
1254 else if (capture_opts.ring_num_files < RINGBUFFER_MIN_NUM_FILES)
1255 capture_opts.ring_num_files = RINGBUFFER_MIN_NUM_FILES;
1259 if (rfilter != NULL) {
1260 if (!dfilter_compile(rfilter, &rfcode)) {
1261 fprintf(stderr, "tethereal: %s\n", dfilter_error_msg);
1263 #ifdef HAVE_PCAP_OPEN_DEAD
1267 pc = pcap_open_dead(DLT_EN10MB, MIN_PACKET_SIZE);
1269 if (pcap_compile(pc, &fcode, rfilter, 0, 0) != -1) {
1271 " Note: That display filter code looks like a valid capture filter;\n"
1272 " maybe you mixed them up?\n");
1281 cfile.rfcode = rfcode;
1283 if (print_packet_info) {
1284 /* If we're printing as text or PostScript, we have
1285 to create a print stream. */
1286 if (output_action == WRITE_TEXT) {
1287 switch (print_format) {
1290 print_stream = print_stream_text_stdio_new(stdout);
1294 print_stream = print_stream_ps_stdio_new(stdout);
1298 g_assert_not_reached();
1303 /* We have to dissect each packet if:
1305 we're printing information about each packet;
1307 we're using a read filter on the packets;
1309 we're using any taps. */
1310 do_dissection = print_packet_info || rfcode || have_tap_listeners();
1314 * We're reading a capture file.
1319 * Immediately relinquish any set-UID or set-GID privileges we have;
1320 * we must not be allowed to read any capture files the user running
1321 * Tethereal can't open.
1327 if (cf_open(&cfile, cf_name, FALSE, &err) != CF_OK) {
1332 /* Set timestamp precision; there should arguably be a command-line
1333 option to let the user set this. */
1334 switch(wtap_file_tsprecision(cfile.wth)) {
1335 case(WTAP_FILE_TSPREC_SEC):
1336 timestamp_set_precision(TS_PREC_AUTO_SEC);
1338 case(WTAP_FILE_TSPREC_DSEC):
1339 timestamp_set_precision(TS_PREC_AUTO_DSEC);
1341 case(WTAP_FILE_TSPREC_CSEC):
1342 timestamp_set_precision(TS_PREC_AUTO_CSEC);
1344 case(WTAP_FILE_TSPREC_MSEC):
1345 timestamp_set_precision(TS_PREC_AUTO_MSEC);
1347 case(WTAP_FILE_TSPREC_USEC):
1348 timestamp_set_precision(TS_PREC_AUTO_USEC);
1350 case(WTAP_FILE_TSPREC_NSEC):
1351 timestamp_set_precision(TS_PREC_AUTO_NSEC);
1354 g_assert_not_reached();
1357 /* Process the packets in the file */
1358 err = load_cap_file(&cfile, save_file, out_file_type);
1365 /* No capture file specified, so we're supposed to do a live capture
1366 (or get a list of link-layer types for a live capture device);
1367 do we have support for live captures? */
1374 fprintf(stderr, "tethereal: WinPcap couldn't be found.\n");
1375 detailed_err = cant_load_winpcap_err("Tethereal");
1376 fprintf(stderr, "%s\n", detailed_err);
1377 g_free(detailed_err);
1382 /* Yes; did the user specify an interface to use? */
1383 if (capture_opts.iface == NULL) {
1384 /* No - is a default specified in the preferences file? */
1385 if (prefs->capture_device != NULL) {
1387 if_text = strrchr(prefs->capture_device, ' ');
1388 if (if_text == NULL) {
1389 capture_opts.iface = g_strdup(prefs->capture_device);
1391 capture_opts.iface = g_strdup(if_text + 1); /* Skip over space */
1394 /* No - pick the first one from the list of interfaces. */
1395 if_list = get_interface_list(&err, err_str);
1396 if (if_list == NULL) {
1399 case CANT_GET_INTERFACE_LIST:
1400 cant_get_if_list_errstr = cant_get_if_list_error_message(err_str);
1401 fprintf(stderr, "tethereal: %s\n", cant_get_if_list_errstr);
1402 g_free(cant_get_if_list_errstr);
1405 case NO_INTERFACES_FOUND:
1406 fprintf(stderr, "tethereal: There are no interfaces on which a capture can be done\n");
1411 if_info = if_list->data; /* first interface */
1412 capture_opts.iface = g_strdup(if_info->name);
1413 free_interface_list(if_list);
1417 if (list_link_layer_types) {
1418 /* We were asked to list the link-layer types for an interface.
1419 Get the list of link-layer types for the capture device. */
1420 lt_list = get_pcap_linktype_list(capture_opts.iface, err_str);
1421 if (lt_list == NULL) {
1422 if (err_str[0] != '\0') {
1423 fprintf(stderr, "tethereal: The list of data link types for the capture device could not be obtained (%s).\n"
1424 "Please check to make sure you have sufficient permissions, and that\n"
1425 "you have the proper interface or pipe specified.\n", err_str);
1427 fprintf(stderr, "tethereal: The capture device has no data link types.\n");
1430 fprintf(stderr, "Data link types (use option -y to set):\n");
1431 for (lt_entry = lt_list; lt_entry != NULL;
1432 lt_entry = g_list_next(lt_entry)) {
1433 data_link_info = lt_entry->data;
1434 fprintf(stderr, " %s", data_link_info->name);
1435 if (data_link_info->description != NULL)
1436 fprintf(stderr, " (%s)", data_link_info->description);
1438 fprintf(stderr, " (not supported)");
1441 free_pcap_linktype_list(lt_list);
1447 * The user didn't ask us not to print a count of packets as
1448 * they arrive, so do so.
1450 print_packet_counts = TRUE;
1453 /* For now, assume libpcap gives microsecond precision. */
1454 timestamp_set_precision(TS_PREC_AUTO_USEC);
1456 capture(save_file, out_file_type);
1458 if (capture_opts.multi_files_on) {
1462 /* No - complain. */
1463 fprintf(stderr, "This version of Tethereal was not built with support for capturing packets.\n");
1468 draw_tap_listeners(TRUE);
1475 /* Do the low-level work of a capture.
1476 Returns TRUE if it succeeds, FALSE otherwise. */
1478 static condition *volatile cnd_ring_timeout = NULL; /* this must be visible in process_packet */
1481 capture(char *save_file, int out_file_type)
1485 gchar open_err_str[PCAP_ERRBUF_SIZE];
1486 gchar lookup_net_err_str[PCAP_ERRBUF_SIZE];
1487 bpf_u_int32 netnum, netmask;
1488 struct bpf_program fcode;
1489 const char *set_linktype_err_str;
1491 int volatile volatile_err = 0;
1492 int volatile inpkts = 0;
1494 char errmsg[1024+1];
1495 condition *volatile cnd_stop_capturesize = NULL;
1496 condition *volatile cnd_stop_timeout = NULL;
1499 void (*oldhandler)(int);
1500 static const char ppamsg[] = "can't find PPA for ";
1501 const char *libpcap_warn;
1502 volatile int pipe_fd = -1;
1503 struct pcap_hdr hdr;
1504 struct pcaprec_modified_hdr rechdr;
1505 guchar pcap_data[WTAP_MAX_PACKET_SIZE];
1507 struct pcap_stat stats;
1510 dfilter_t *rfcode = NULL;
1513 /* Initialize all data structures used for dissection. */
1516 ld.linktype = WTAP_ENCAP_UNKNOWN;
1519 /* Open the network interface to capture from it.
1520 Some versions of libpcap may put warnings into the error buffer
1521 if they succeed; to tell if that's happened, we have to clear
1522 the error buffer, and check if it's still a null string. */
1523 open_err_str[0] = '\0';
1524 ld.pch = pcap_open_live(capture_opts.iface, capture_opts.snaplen,
1525 capture_opts.promisc_mode, 1000, open_err_str);
1527 if (ld.pch != NULL) {
1528 /* setting the data link type only works on real interfaces */
1529 if (capture_opts.linktype != -1) {
1530 set_linktype_err_str = set_pcap_linktype(ld.pch, capture_opts.iface,
1531 capture_opts.linktype);
1532 if (set_linktype_err_str != NULL) {
1533 g_snprintf(errmsg, sizeof errmsg, "Unable to set data link type (%s).",
1534 set_linktype_err_str);
1539 /* We couldn't open "cfile.iface" as a network device. */
1541 /* On Windows, we don't support capturing on pipes, so we give up. */
1543 /* On Win32 OSes, the capture devices are probably available to all
1544 users; don't warn about permissions problems.
1546 Do, however, warn about the lack of 64-bit support, and warn that
1547 WAN devices aren't supported. */
1548 g_snprintf(errmsg, sizeof errmsg,
1549 "The capture session could not be initiated (%s).\n"
1550 "Please check that you have the proper interface specified.\n"
1552 "Help can be found at: http://wiki.ethereal.com/CaptureSetup\n"
1554 "WinPcap does not support 64-bit Windows, so you will not be able to capture\n"
1555 "traffic with Tethereal on 64-bit Windows. You will have to use some other\n"
1556 "tool to capture traffic, such as netcap; see\n"
1558 " http://support.microsoft.com/?id=310875\n"
1560 "for information about netcap.\n"
1562 "Note that version 3.0 of WinPcap, and earlier versions of WinPcap, don't\n"
1563 "support capturing on PPP/WAN interfaces on Windows NT 4.0 / 2000 / XP /\n"
1565 "WinPcap 3.1 has support for it on Windows 2000 / XP / Server 2003, but has no\n"
1566 "support for it on Windows NT 4.0 or Windows Vista (Beta 1).\n",
1570 /* try to open cfile.iface as a pipe */
1571 pipe_fd = pipe_open_live(capture_opts.iface, &hdr, &ld, errmsg,
1574 if (pipe_fd == -1) {
1576 if (ld.pipe_err == PIPNEXIST) {
1577 /* Pipe doesn't exist, so output message for interface */
1579 /* If we got a "can't find PPA for XXX" message, warn the user (who
1580 is running Tethereal on HP-UX) that they don't have a version
1581 of libpcap that properly handles HP-UX (libpcap 0.6.x and later
1582 versions, which properly handle HP-UX, say "can't find /dev/dlpi
1583 PPA for XXX" rather than "can't find PPA for XXX"). */
1584 if (strncmp(open_err_str, ppamsg, sizeof ppamsg - 1) == 0)
1587 "You are running Tethereal with a version of the libpcap library\n"
1588 "that doesn't handle HP-UX network devices well; this means that\n"
1589 "Tethereal may not be able to capture packets.\n"
1591 "To fix this, you should install libpcap 0.6.2, or a later version\n"
1592 "of libpcap, rather than libpcap 0.4 or 0.5.x. It is available in\n"
1593 "packaged binary form from the Software Porting And Archive Centre\n"
1594 "for HP-UX; the Centre is at http://hpux.connect.org.uk/ - the page\n"
1595 "at the URL lists a number of mirror sites.";
1598 g_snprintf(errmsg, sizeof errmsg,
1599 "The capture session could not be initiated (%s).\n"
1600 "Please check to make sure you have sufficient permissions, and that\n"
1601 "you have the proper interface or pipe specified.%s", open_err_str,
1605 * Else pipe (or file) does exist and pipe_open_live() has
1610 /* pipe_open_live() succeeded; don't want
1611 error message from pcap_open_live() */
1612 open_err_str[0] = '\0';
1618 * We've opened the capture device, so, if we're set-UID or set-GID,
1619 * relinquish those privileges.
1621 * XXX - if we have saved set-user-ID support, we should give up those
1622 * privileges immediately, and then reclaim them long enough to get
1623 * a list of network interfaces and to open one, and then give them
1624 * up again, so that stuff we do while processing the argument list,
1625 * reading the user's preferences, etc. is done as the real user and
1626 * group, not the effective user and group.
1632 if (capture_opts.cfilter && !ld.from_pipe) {
1633 /* A capture filter was specified; set it up. */
1634 if (pcap_lookupnet(capture_opts.iface, &netnum, &netmask, lookup_net_err_str) < 0) {
1636 * Well, we can't get the netmask for this interface; it's used
1637 * only for filters that check for broadcast IP addresses, so
1638 * we just warn the user, and punt and use 0.
1641 "Warning: Couldn't obtain netmask info (%s).\n", lookup_net_err_str);
1644 if (pcap_compile(ld.pch, &fcode, capture_opts.cfilter, 1, netmask) < 0) {
1645 if (dfilter_compile(capture_opts.cfilter, &rfcode)) {
1646 g_snprintf(errmsg, sizeof errmsg,
1647 "Unable to parse capture filter string (%s).\n"
1648 " Interestingly enough, this looks like a valid display filter\n"
1649 " Are you sure you didn't mix them up?",
1650 pcap_geterr(ld.pch));
1652 g_snprintf(errmsg, sizeof errmsg,
1653 "Unable to parse capture filter string (%s).",
1654 pcap_geterr(ld.pch));
1658 if (pcap_setfilter(ld.pch, &fcode) < 0) {
1659 g_snprintf(errmsg, sizeof errmsg, "Can't install filter (%s).",
1660 pcap_geterr(ld.pch));
1661 #ifdef HAVE_PCAP_FREECODE
1662 pcap_freecode(&fcode);
1666 #ifdef HAVE_PCAP_FREECODE
1667 pcap_freecode(&fcode);
1671 /* Set up to write to the capture file. */
1674 pcap_encap = hdr.network;
1675 file_snaplen = hdr.snaplen;
1679 pcap_encap = get_pcap_linktype(ld.pch, capture_opts.iface);
1680 file_snaplen = pcap_snapshot(ld.pch);
1682 ld.linktype = wtap_pcap_encap_to_wtap_encap(pcap_encap);
1683 if (save_file != NULL) {
1684 /* Set up to write to the capture file. */
1685 if (ld.linktype == WTAP_ENCAP_UNKNOWN) {
1686 strcpy(errmsg, "The network you're capturing from is of a type"
1687 " that Tethereal doesn't support.");
1690 ld.save_file = save_file;
1691 if (capture_opts.multi_files_on) {
1692 save_file_fd = ringbuf_init(save_file,
1693 capture_opts.ring_num_files);
1694 if (save_file_fd != -1) {
1695 ld.pdh = ringbuf_init_wtap_dump_fdopen(out_file_type, ld.linktype,
1696 file_snaplen, &err);
1698 err = errno; /* "ringbuf_init()" failed */
1702 ld.pdh = wtap_dump_open(save_file, out_file_type,
1703 ld.linktype, file_snaplen, FALSE /* compress */, &err);
1706 if (ld.pdh == NULL) {
1707 g_snprintf(errmsg, sizeof errmsg,
1708 cf_open_error_message(err, NULL, TRUE, out_file_type),
1709 *save_file == '\0' ? "stdout" : save_file);
1714 /* Does "open_err_str" contain a non-empty string? If so, "pcap_open_live()"
1715 returned a warning; print it, but keep capturing. */
1716 if (open_err_str[0] != '\0')
1717 fprintf(stderr, "tethereal: WARNING: %s.\n", open_err_str);
1720 /* Catch a CTRL+C event and, if we get it, clean up and exit. */
1721 SetConsoleCtrlHandler(capture_cleanup, TRUE);
1723 /* Catch SIGINT and SIGTERM and, if we get either of them, clean up
1725 XXX - deal with signal semantics on various UNIX platforms. Or just
1726 use "sigaction()" and be done with it? */
1727 signal(SIGTERM, capture_cleanup);
1728 signal(SIGINT, capture_cleanup);
1729 if ((oldhandler = signal(SIGHUP, capture_cleanup)) != SIG_DFL)
1730 signal(SIGHUP, oldhandler);
1733 /* Catch SIGINFO and, if we get it and we're capturing to a file in
1734 quiet mode, report the number of packets we've captured. */
1735 signal(SIGINFO, report_counts_siginfo);
1736 #endif /* SIGINFO */
1739 /* Let the user know what interface was chosen. */
1740 descr = get_interface_descriptive_name(capture_opts.iface);
1741 fprintf(stderr, "Capturing on %s\n", descr);
1744 /* initialize capture stop conditions */
1745 init_capture_stop_conditions();
1746 /* create stop conditions */
1747 if (capture_opts.has_autostop_filesize)
1748 cnd_stop_capturesize = cnd_new((const char*)CND_CLASS_CAPTURESIZE,
1749 (long)capture_opts.autostop_filesize * 1024);
1750 if (capture_opts.has_autostop_duration)
1751 cnd_stop_timeout = cnd_new((const char*)CND_CLASS_TIMEOUT,
1752 (gint32)capture_opts.autostop_duration);
1754 if (capture_opts.multi_files_on && capture_opts.has_file_duration)
1755 cnd_ring_timeout = cnd_new(CND_CLASS_TIMEOUT,
1756 capture_opts.file_duration);
1758 if (!setjmp(ld.stopenv)) {
1760 ld.packet_count = 0;
1764 /* We need to be careful with automatic variables defined in the
1765 outer scope which are changed inside the loop. Most compilers
1766 don't try to roll them back to their original values after the
1767 longjmp which causes the loop to finish, but all that the
1768 standards say is that their values are indeterminate. If we
1769 don't want them to be rolled back, we should define them with the
1770 volatile attribute (paraphrasing W. Richard Stevens, Advanced
1771 Programming in the UNIX Environment, p. 178).
1773 The "err" variable causes a particular problem. If we give it
1774 the volatile attribute, then when we pass a reference to it (as
1775 in "&err") to a function, GCC warns: "passing arg <n> of
1776 <function> discards qualifiers from pointer target type".
1777 Therefore within the loop and just beyond we don't use "err".
1778 Within the loop we define "loop_err", and assign its value to
1779 "volatile_err", which is in the outer scope and is checked when
1782 We also define "packet_count_prev" here to keep things tidy,
1783 since it's used only inside the loop. If it were defined in the
1784 outer scope, GCC would give a warning (unnecessary in this case)
1785 that it might be clobbered, and we'd need to give it the volatile
1786 attribute to suppress the warning. */
1789 int packet_count_prev = 0;
1791 if (cnd_stop_capturesize == NULL && cnd_stop_timeout == NULL) {
1792 /* We're not stopping at a particular capture file size, and we're
1793 not stopping after some particular amount of time has expired,
1794 so either we have no stop condition or the only stop condition
1795 is a maximum packet count.
1797 If there's no maximum packet count, pass it -1, meaning "until
1798 you run out of packets in the bufferful you read". Otherwise,
1799 pass it the number of packets we have left to capture.
1801 We don't call "pcap_loop()" as, if we're saving to a file that's
1802 a FIFO, we want to flush the FIFO after we're done processing
1803 this libpcap bufferful of packets, so that the program
1804 reading the FIFO sees the packets immediately and doesn't get
1805 any partial packet, forcing it to block in the middle of reading
1807 if (capture_opts.autostop_packets == 0)
1810 if (ld.packet_count >= capture_opts.autostop_packets) {
1811 /* XXX do we need this test here? */
1812 /* It appears there's nothing more to capture. */
1815 pcap_cnt = capture_opts.autostop_packets - ld.packet_count;
1818 /* We need to check the capture file size or the timeout after
1824 inpkts = pipe_dispatch(pipe_fd, &ld, &hdr, &rechdr, pcap_data,
1825 errmsg, sizeof errmsg);
1828 inpkts = pcap_dispatch(ld.pch, pcap_cnt, capture_pcap_cb, (u_char *) &ld);
1830 /* Error from "pcap_dispatch()", or error or "no more packets" from
1831 "pipe_dispatch(). */
1833 } else if (cnd_stop_timeout != NULL && cnd_eval(cnd_stop_timeout)) {
1834 /* The specified capture time has elapsed; stop the capture. */
1836 } else if (inpkts > 0) {
1837 if (capture_opts.autostop_packets != 0 &&
1838 ld.packet_count >= capture_opts.autostop_packets) {
1839 /* The specified number of packets have been captured and have
1840 passed both any capture filter in effect and any read filter
1843 } else if (cnd_stop_capturesize != NULL &&
1844 cnd_eval(cnd_stop_capturesize,
1845 (guint32)wtap_get_bytes_dumped(ld.pdh))) {
1846 /* We're saving the capture to a file, and the capture file reached
1847 its maximum size. */
1848 if (capture_opts.multi_files_on) {
1849 /* Switch to the next ringbuffer file */
1850 if (ringbuf_switch_file(&ld.pdh, &save_file, &save_file_fd, &loop_err)) {
1851 /* File switch succeeded: reset the condition */
1852 cnd_reset(cnd_stop_capturesize);
1853 if (cnd_ring_timeout) {
1854 cnd_reset(cnd_ring_timeout);
1857 /* File switch failed: stop here */
1858 volatile_err = loop_err;
1862 /* No ringbuffer - just stop. */
1866 if (ld.output_to_pipe) {
1867 if (ld.packet_count > packet_count_prev) {
1868 wtap_dump_flush(ld.pdh);
1869 packet_count_prev = ld.packet_count;
1873 } /* while (ld.go) */
1875 /* delete stop conditions */
1876 if (cnd_stop_capturesize != NULL)
1877 cnd_delete(cnd_stop_capturesize);
1878 if (cnd_stop_timeout != NULL)
1879 cnd_delete(cnd_stop_timeout);
1880 if (cnd_ring_timeout != NULL)
1881 cnd_delete(cnd_ring_timeout);
1883 if (print_packet_counts) {
1884 /* We're printing packet counts to stderr.
1885 Send a newline so that we move to the line after the packet count. */
1886 fprintf(stderr, "\n");
1889 /* If we got an error while capturing, report it. */
1893 if (ld.pipe_err == PIPERR) {
1894 fprintf(stderr, "tethereal: Error while capturing packets: %s\n",
1900 fprintf(stderr, "tethereal: Error while capturing packets: %s\n",
1901 pcap_geterr(ld.pch));
1905 if (volatile_err == 0)
1908 show_capture_file_io_error(save_file, volatile_err, FALSE);
1912 if (save_file != NULL) {
1913 /* We're saving to a file or files; close all files. */
1914 if (capture_opts.multi_files_on) {
1915 dump_ok = ringbuf_wtap_dump_close(&save_file, &err);
1917 dump_ok = wtap_dump_close(ld.pdh, &err);
1919 /* If we've displayed a message about a write error, there's no point
1920 in displaying another message about an error on close. */
1921 if (!dump_ok && !write_err)
1922 show_capture_file_io_error(save_file, err, TRUE);
1926 if (ld.from_pipe && pipe_fd >= 0)
1931 /* Get the capture statistics, and, if any packets were dropped, report
1933 if (pcap_stats(ld.pch, &stats) >= 0) {
1934 if (stats.ps_drop != 0) {
1935 fprintf(stderr, "%u packets dropped\n", stats.ps_drop);
1938 fprintf(stderr, "tethereal: Can't get packet-drop statistics: %s\n",
1939 pcap_geterr(ld.pch));
1944 /* Report the number of captured packets if not reported during capture
1945 and we are saving to a file. */
1951 if (capture_opts.multi_files_on) {
1952 ringbuf_error_cleanup();
1956 fprintf(stderr, "tethereal: %s\n", errmsg);
1972 capture_pcap_cb(u_char *user, const struct pcap_pkthdr *phdr,
1975 struct wtap_pkthdr whdr;
1976 union wtap_pseudo_header pseudo_header;
1977 loop_data *ldat = (loop_data *) user;
1982 /* Convert from libpcap to Wiretap format.
1983 If that fails, ignore the packet (wtap_process_pcap_packet has
1984 written an error message). */
1985 pd = wtap_process_pcap_packet(ldat->linktype, phdr, pd, &pseudo_header,
1992 * Prevent a SIGINFO handler from writing to stdout while we're
1993 * doing so; instead, have it just set a flag telling us to print
1994 * that information when we're done.
1997 #endif /* SIGINFO */
1999 /* The current packet may have arrived after a very long silence,
2000 * way past the time to switch files. In order not to have
2001 * the first packet of a new series of events as the last
2002 * [or only] packet in the file, switch before writing!
2004 if (cnd_ring_timeout != NULL && cnd_eval(cnd_ring_timeout)) {
2005 /* time elapsed for this ring file, switch to the next */
2006 if (ringbuf_switch_file(&ldat->pdh, &ldat->save_file, &save_file_fd, &loop_err)) {
2007 /* File switch succeeded: reset the condition */
2008 cnd_reset(cnd_ring_timeout);
2010 /* File switch failed: stop here */
2011 /* XXX - we should do something with "loop_err" */
2016 if (!process_packet(&cfile, ldat->pdh, 0, &whdr, &pseudo_header, pd, &err)) {
2017 /* Error writing to a capture file */
2018 if (print_packet_counts) {
2019 /* We're printing counts of packets captured; move to the line after
2021 fprintf(stderr, "\n");
2023 show_capture_file_io_error(ldat->save_file, err, FALSE);
2024 pcap_close(ldat->pch);
2025 wtap_dump_close(ldat->pdh, &err);
2031 * Allow SIGINFO handlers to write.
2036 * If a SIGINFO handler asked us to write out capture counts, do so.
2040 #endif /* SIGINFO */
2045 capture_cleanup(DWORD ctrltype _U_)
2047 /* CTRL_C_EVENT is sort of like SIGINT, CTRL_BREAK_EVENT is unique to
2048 Windows, CTRL_CLOSE_EVENT is sort of like SIGHUP, CTRL_LOGOFF_EVENT
2049 is also sort of like SIGHUP, and CTRL_SHUTDOWN_EVENT is sort of
2050 like SIGTERM at least when the machine's shutting down.
2052 For now, we handle them all as indications that we should clean up
2053 and quit, just as we handle SIGINT, SIGHUP, and SIGTERM in that
2056 However, as handlers run in a new thread, we can't just longjmp
2057 out; we have to set "ld.go" to FALSE, and must return TRUE so that
2058 no other handler - such as one that would terminate the process -
2061 XXX - for some reason, typing ^C to Tethereal, if you run this in
2062 a Cygwin console window in at least some versions of Cygwin,
2063 causes Tethereal to terminate immediately; this routine gets
2064 called, but the main loop doesn't get a chance to run and
2065 exit cleanly, at least if this is compiled with Microsoft Visual
2066 C++ (i.e., it's a property of the Cygwin console window or Bash;
2067 it happens if Tethereal is not built with Cygwin - for all I know,
2068 building it with Cygwin may make the problem go away). */
2074 capture_cleanup(int signum _U_)
2076 /* Longjmp back to the starting point; "pcap_dispatch()", on many
2077 UNIX platforms, just keeps looping if it gets EINTR, so if we set
2078 "ld.go" to FALSE and return, we won't break out of it and quit
2080 longjmp(ld.stopenv, 1);
2088 /* XXX - if we use sigaction, this doesn't have to be done.
2089 (Yes, this isn't necessary on BSD, but just in case a system
2090 where "signal()" has AT&T semantics adopts SIGINFO....) */
2091 signal(SIGINFO, report_counts_siginfo);
2092 #endif /* SIGINFO */
2094 if (!print_packet_counts) {
2095 /* Report the count only if we aren't printing a packet count
2096 as packets arrive. */
2097 fprintf(stderr, "%u packets captured\n", ld.packet_count);
2100 infoprint = FALSE; /* we just reported it */
2101 #endif /* SIGINFO */
2106 report_counts_siginfo(int signum _U_)
2108 int sav_errno = errno;
2109 /* If we've been told to delay printing, just set a flag asking
2110 that we print counts (if we're supposed to), otherwise print
2111 the count of packets captured (if we're supposed to). */
2118 #endif /* SIGINFO */
2119 #endif /* HAVE_LIBPCAP */
2122 load_cap_file(capture_file *cf, char *save_file, int out_file_type)
2125 int snapshot_length;
2131 linktype = wtap_file_encap(cf->wth);
2132 if (save_file != NULL) {
2133 /* Set up to write to the capture file. */
2134 snapshot_length = wtap_snapshot_length(cf->wth);
2135 if (snapshot_length == 0) {
2136 /* Snapshot length of input file not known. */
2137 snapshot_length = WTAP_MAX_PACKET_SIZE;
2139 pdh = wtap_dump_open(save_file, out_file_type,
2140 linktype, snapshot_length, FALSE /* compressed */, &err);
2143 /* We couldn't set up to write to the capture file. */
2146 case WTAP_ERR_UNSUPPORTED_FILE_TYPE:
2148 "tethereal: Capture files can't be written in that format.\n");
2151 case WTAP_ERR_UNSUPPORTED_ENCAP:
2152 case WTAP_ERR_ENCAP_PER_PACKET_UNSUPPORTED:
2154 "tethereal: The capture file being read can't be written in "
2158 case WTAP_ERR_CANT_OPEN:
2160 "tethereal: The file \"%s\" couldn't be created for some "
2161 "unknown reason.\n",
2162 *save_file == '\0' ? "stdout" : save_file);
2165 case WTAP_ERR_SHORT_WRITE:
2167 "tethereal: A full header couldn't be written to the file \"%s\".\n",
2168 *save_file == '\0' ? "stdout" : save_file);
2173 "tethereal: The file \"%s\" could not be created: %s\n.",
2174 *save_file == '\0' ? "stdout" : save_file,
2175 wtap_strerror(err));
2181 if (print_packet_info) {
2182 if (!write_preamble(cf)) {
2184 show_print_file_io_error(err);
2190 while (wtap_read(cf->wth, &err, &err_info, &data_offset)) {
2191 if (!process_packet(cf, pdh, data_offset, wtap_phdr(cf->wth),
2192 wtap_pseudoheader(cf->wth), wtap_buf_ptr(cf->wth),
2194 /* Error writing to a capture file */
2195 show_capture_file_io_error(save_file, err, FALSE);
2196 wtap_dump_close(pdh, &err);
2201 /* Print a message noting that the read failed somewhere along the line. */
2204 case WTAP_ERR_UNSUPPORTED_ENCAP:
2206 "tethereal: \"%s\" has a packet with a network type that Tethereal doesn't support.\n(%s)\n",
2207 cf->filename, err_info);
2210 case WTAP_ERR_CANT_READ:
2212 "tethereal: An attempt to read from \"%s\" failed for some unknown reason.\n",
2216 case WTAP_ERR_SHORT_READ:
2218 "tethereal: \"%s\" appears to have been cut short in the middle of a packet.\n",
2222 case WTAP_ERR_BAD_RECORD:
2224 "tethereal: \"%s\" appears to be damaged or corrupt.\n(%s)\n",
2225 cf->filename, err_info);
2230 "tethereal: An error occurred while reading \"%s\": %s.\n",
2231 cf->filename, wtap_strerror(err));
2234 if (save_file != NULL) {
2235 /* Now close the capture file. */
2236 if (!wtap_dump_close(pdh, &err))
2237 show_capture_file_io_error(save_file, err, TRUE);
2240 if (save_file != NULL) {
2241 /* Now close the capture file. */
2242 if (!wtap_dump_close(pdh, &err))
2243 show_capture_file_io_error(save_file, err, TRUE);
2245 if (print_packet_info) {
2246 if (!write_finale()) {
2248 show_print_file_io_error(err);
2255 wtap_close(cf->wth);
2262 fill_in_fdata(frame_data *fdata, capture_file *cf,
2263 const struct wtap_pkthdr *phdr, long offset)
2268 fdata->num = cf->count;
2269 fdata->pkt_len = phdr->len;
2270 cum_bytes += phdr->len;
2271 fdata->cum_bytes = cum_bytes;
2272 fdata->cap_len = phdr->caplen;
2273 fdata->file_off = offset;
2274 fdata->lnk_t = phdr->pkt_encap;
2275 fdata->abs_ts = *((nstime_t *) &phdr->ts);
2276 fdata->flags.passed_dfilter = 0;
2277 fdata->flags.encoding = CHAR_ASCII;
2278 fdata->flags.visited = 0;
2279 fdata->flags.marked = 0;
2280 fdata->flags.ref_time = 0;
2282 /* If we don't have the time stamp of the first packet in the
2283 capture, it's because this is the first packet. Save the time
2284 stamp of this packet as the time stamp of the first packet. */
2285 if (nstime_is_zero(&first_ts)) {
2286 first_ts = fdata->abs_ts;
2289 /* If we don't have the time stamp of the previous displayed packet,
2290 it's because this is the first displayed packet. Save the time
2291 stamp of this packet as the time stamp of the previous displayed
2293 if (nstime_is_zero(&prev_ts)) {
2294 prev_ts = fdata->abs_ts;
2297 /* Get the time elapsed between the first packet and this packet. */
2298 nstime_delta(&fdata->rel_ts, &fdata->abs_ts, &first_ts);
2300 /* If it's greater than the current elapsed time, set the elapsed time
2301 to it (we check for "greater than" so as not to be confused by
2302 time moving backwards). */
2303 if ((gint32)cf->elapsed_time.secs < fdata->rel_ts.secs
2304 || ((gint32)cf->elapsed_time.secs == fdata->rel_ts.secs && (gint32)cf->elapsed_time.nsecs < fdata->rel_ts.nsecs)) {
2305 cf->elapsed_time = fdata->rel_ts;
2308 /* Get the time elapsed between the previous displayed packet and
2310 nstime_delta(&fdata->del_ts, &fdata->abs_ts, &prev_ts);
2311 prev_ts = fdata->abs_ts;
2314 /* Free up all data attached to a "frame_data" structure. */
2316 clear_fdata(frame_data *fdata)
2319 g_slist_free(fdata->pfd);
2323 process_packet(capture_file *cf, wtap_dumper *pdh, long offset,
2324 const struct wtap_pkthdr *whdr,
2325 union wtap_pseudo_header *pseudo_header, const guchar *pd,
2329 gboolean create_proto_tree;
2330 epan_dissect_t *edt;
2333 /* Count this packet. */
2336 /* If we're going to print packet information, or we're going to
2337 run a read filter, or we're going to process taps, set up to
2338 do a dissection and do so. */
2339 if (do_dissection) {
2340 fill_in_fdata(&fdata, cf, whdr, offset);
2342 if (print_packet_info) {
2343 /* Grab any resolved addresses */
2345 if (g_resolv_flags) {
2346 host_name_lookup_process(NULL);
2351 if (cf->rfcode || verbose || num_tap_filters!=0)
2352 create_proto_tree = TRUE;
2354 create_proto_tree = FALSE;
2355 /* The protocol tree will be "visible", i.e., printed, only if we're
2356 printing packet details, which is true if we're printing stuff
2357 ("print_packet_info" is true) and we're in verbose mode ("verbose"
2359 edt = epan_dissect_new(create_proto_tree, print_packet_info && verbose);
2361 /* If we're running a read filter, prime the epan_dissect_t with that
2364 epan_dissect_prime_dfilter(edt, cf->rfcode);
2366 tap_queue_init(edt);
2368 /* We only need the columns if we're printing packet info but we're
2369 *not* verbose; in verbose mode, we print the protocol tree, not
2370 the protocol summary. */
2371 epan_dissect_run(edt, pseudo_header, pd, &fdata,
2372 (print_packet_info && !verbose) ? &cf->cinfo : NULL);
2374 tap_push_tapped_queue(edt);
2376 /* Run the read filter if we have one. */
2378 passed = dfilter_apply_edt(cf->rfcode, edt);
2382 /* We're not running a display filter and we're not printing any
2383 packet information, so we don't need to do a dissection, and all
2384 packets are processed. */
2390 /* Count this packet. */
2395 /* Process this packet. */
2397 /* We're writing to a capture file; write this packet. */
2398 if (!wtap_dump(pdh, whdr, pseudo_header, pd, err))
2401 if (print_packet_counts) {
2402 /* We're printing packet counts. */
2403 if (ld.packet_count != 0) {
2404 fprintf(stderr, "\r%u ", ld.packet_count);
2405 /* stderr could be line buffered */
2411 if (print_packet_info) {
2412 /* We're printing packet information; print the information for
2414 print_packet(cf, edt);
2416 /* The ANSI C standard does not appear to *require* that a line-buffered
2417 stream be flushed to the host environment whenever a newline is
2418 written, it just says that, on such a stream, characters "are
2419 intended to be transmitted to or from the host environment as a
2420 block when a new-line character is encountered".
2422 The Visual C++ 6.0 C implementation doesn't do what is intended;
2423 even if you set a stream to be line-buffered, it still doesn't
2424 flush the buffer at the end of every line.
2426 So, if the "-l" flag was specified, we flush the standard output
2427 at the end of a packet. This will do the right thing if we're
2428 printing packet summary lines, and, as we print the entire protocol
2429 tree for a single packet without waiting for anything to happen,
2430 it should be as good as line-buffered mode if we're printing
2431 protocol trees. (The whole reason for the "-l" flag in either
2432 tcpdump or Tethereal is to allow the output of a live capture to
2433 be piped to a program or script and to have that script see the
2434 information for the packet as soon as it's printed, rather than
2435 having to wait until a standard I/O buffer fills up. */
2439 if (ferror(stdout)) {
2440 show_print_file_io_error(errno);
2446 if (do_dissection) {
2447 epan_dissect_free(edt);
2448 clear_fdata(&fdata);
2454 show_capture_file_io_error(const char *fname, int err, gboolean is_close)
2463 "tethereal: Not all the packets could be written to \"%s\" because there is "
2464 "no space left on the file system.\n",
2471 "tethereal: Not all the packets could be written to \"%s\" because you are "
2472 "too close to, or over your disk quota.\n",
2477 case WTAP_ERR_CANT_CLOSE:
2479 "tethereal: \"%s\" couldn't be closed for some unknown reason.\n",
2483 case WTAP_ERR_SHORT_WRITE:
2485 "tethereal: Not all the packets could be written to \"%s\".\n",
2492 "tethereal: \"%s\" could not be closed: %s.\n",
2493 fname, wtap_strerror(err));
2496 "tethereal: An error occurred while writing to \"%s\": %s.\n",
2497 fname, wtap_strerror(err));
2504 write_preamble(capture_file *cf)
2506 switch (output_action) {
2509 return print_preamble(print_stream, cf->filename);
2514 write_pdml_preamble(stdout);
2516 write_psml_preamble(stdout);
2517 return !ferror(stdout);
2520 g_assert_not_reached();
2526 get_line_buf(size_t len)
2528 static char *line_bufp = NULL;
2529 static size_t line_buf_len = 256;
2530 size_t new_line_buf_len;
2532 for (new_line_buf_len = line_buf_len; len > new_line_buf_len;
2533 new_line_buf_len *= 2)
2535 if (line_bufp == NULL) {
2536 line_buf_len = new_line_buf_len;
2537 line_bufp = g_malloc(line_buf_len + 1);
2539 if (new_line_buf_len > line_buf_len) {
2540 line_buf_len = new_line_buf_len;
2541 line_bufp = g_realloc(line_bufp, line_buf_len + 1);
2548 print_columns(capture_file *cf)
2555 line_bufp = get_line_buf(256);
2558 for (i = 0; i < cf->cinfo.num_cols; i++) {
2559 switch (cf->cinfo.col_fmt[i]) {
2563 * Don't print this if we're doing a live capture from a network
2564 * interface - if we're doing a live capture, you won't be
2565 * able to look at the capture in the future (it's not being
2566 * saved anywhere), so the frame numbers are unlikely to be
2569 * (XXX - it might be nice to be able to save and print at
2570 * the same time, sort of like an "Update list of packets
2571 * in real time" capture in Ethereal.)
2573 if (capture_opts.iface != NULL)
2576 column_len = strlen(cf->cinfo.col_data[i]);
2579 line_bufp = get_line_buf(buf_offset + column_len);
2580 sprintf(line_bufp + buf_offset, "%3s", cf->cinfo.col_data[i]);
2586 case COL_ABS_DATE_TIME: /* XXX - wider */
2587 column_len = strlen(cf->cinfo.col_data[i]);
2588 if (column_len < 10)
2590 line_bufp = get_line_buf(buf_offset + column_len);
2591 sprintf(line_bufp + buf_offset, "%10s", cf->cinfo.col_data[i]);
2597 case COL_DEF_DL_SRC:
2598 case COL_RES_DL_SRC:
2599 case COL_UNRES_DL_SRC:
2600 case COL_DEF_NET_SRC:
2601 case COL_RES_NET_SRC:
2602 case COL_UNRES_NET_SRC:
2603 column_len = strlen(cf->cinfo.col_data[i]);
2604 if (column_len < 12)
2606 line_bufp = get_line_buf(buf_offset + column_len);
2607 sprintf(line_bufp + buf_offset, "%12s", cf->cinfo.col_data[i]);
2613 case COL_DEF_DL_DST:
2614 case COL_RES_DL_DST:
2615 case COL_UNRES_DL_DST:
2616 case COL_DEF_NET_DST:
2617 case COL_RES_NET_DST:
2618 case COL_UNRES_NET_DST:
2619 column_len = strlen(cf->cinfo.col_data[i]);
2620 if (column_len < 12)
2622 line_bufp = get_line_buf(buf_offset + column_len);
2623 sprintf(line_bufp + buf_offset, "%-12s", cf->cinfo.col_data[i]);
2627 column_len = strlen(cf->cinfo.col_data[i]);
2628 line_bufp = get_line_buf(buf_offset + column_len);
2629 strcat(line_bufp + buf_offset, cf->cinfo.col_data[i]);
2632 buf_offset += column_len;
2633 if (i != cf->cinfo.num_cols - 1) {
2635 * This isn't the last column, so we need to print a
2636 * separator between this column and the next.
2638 * If we printed a network source and are printing a
2639 * network destination of the same type next, separate
2640 * them with "->"; if we printed a network destination
2641 * and are printing a network source of the same type
2642 * next, separate them with "<-"; otherwise separate them
2645 * We add enough space to the buffer for " <- " or " -> ",
2646 * even if we're only adding " ".
2648 line_bufp = get_line_buf(buf_offset + 4);
2649 switch (cf->cinfo.col_fmt[i]) {
2654 switch (cf->cinfo.col_fmt[i + 1]) {
2659 strcat(line_bufp + buf_offset, " -> ");
2664 strcat(line_bufp + buf_offset, " ");
2670 case COL_DEF_DL_SRC:
2671 case COL_RES_DL_SRC:
2672 case COL_UNRES_DL_SRC:
2673 switch (cf->cinfo.col_fmt[i + 1]) {
2675 case COL_DEF_DL_DST:
2676 case COL_RES_DL_DST:
2677 case COL_UNRES_DL_DST:
2678 strcat(line_bufp + buf_offset, " -> ");
2683 strcat(line_bufp + buf_offset, " ");
2689 case COL_DEF_NET_SRC:
2690 case COL_RES_NET_SRC:
2691 case COL_UNRES_NET_SRC:
2692 switch (cf->cinfo.col_fmt[i + 1]) {
2694 case COL_DEF_NET_DST:
2695 case COL_RES_NET_DST:
2696 case COL_UNRES_NET_DST:
2697 strcat(line_bufp + buf_offset, " -> ");
2702 strcat(line_bufp + buf_offset, " ");
2711 switch (cf->cinfo.col_fmt[i + 1]) {
2716 strcat(line_bufp + buf_offset, " <- ");
2721 strcat(line_bufp + buf_offset, " ");
2727 case COL_DEF_DL_DST:
2728 case COL_RES_DL_DST:
2729 case COL_UNRES_DL_DST:
2730 switch (cf->cinfo.col_fmt[i + 1]) {
2732 case COL_DEF_DL_SRC:
2733 case COL_RES_DL_SRC:
2734 case COL_UNRES_DL_SRC:
2735 strcat(line_bufp + buf_offset, " <- ");
2740 strcat(line_bufp + buf_offset, " ");
2746 case COL_DEF_NET_DST:
2747 case COL_RES_NET_DST:
2748 case COL_UNRES_NET_DST:
2749 switch (cf->cinfo.col_fmt[i + 1]) {
2751 case COL_DEF_NET_SRC:
2752 case COL_RES_NET_SRC:
2753 case COL_UNRES_NET_SRC:
2754 strcat(line_bufp + buf_offset, " <- ");
2759 strcat(line_bufp + buf_offset, " ");
2766 strcat(line_bufp + buf_offset, " ");
2772 return print_line(print_stream, 0, line_bufp);
2776 print_packet(capture_file *cf, epan_dissect_t *edt)
2778 print_args_t print_args;
2781 /* Print the information in the protocol tree. */
2782 switch (output_action) {
2785 print_args.to_file = TRUE;
2786 print_args.format = print_format;
2787 print_args.print_summary = !verbose;
2788 print_args.print_hex = verbose && print_hex;
2789 print_args.print_formfeed = FALSE;
2790 print_args.print_dissections = verbose ? print_dissections_expanded : print_dissections_none;
2792 /* init the packet range */
2793 packet_range_init(&print_args.range);
2795 if (!proto_tree_print(&print_args, edt, print_stream))
2798 /* "print_hex_data()" will put out a leading blank line, as well
2799 as a trailing one; print one here, to separate the packets,
2800 only if "print_hex_data()" won't be called. */
2801 if (!print_line(print_stream, 0, ""))
2807 proto_tree_write_pdml(edt, stdout);
2809 return !ferror(stdout);
2812 /* Just fill in the columns. */
2813 epan_dissect_fill_in_columns(edt);
2815 /* Now print them. */
2816 switch (output_action) {
2819 if (!print_columns(cf))
2824 proto_tree_write_psml(edt, stdout);
2825 return !ferror(stdout);
2829 if (!print_hex_data(print_stream, edt))
2831 if (!print_line(print_stream, 0, ""))
2840 switch (output_action) {
2843 return print_finale(print_stream);
2848 write_pdml_finale(stdout);
2850 write_psml_finale(stdout);
2851 return !ferror(stdout);
2854 g_assert_not_reached();
2860 show_print_file_io_error(int err)
2866 "tethereal: Not all the packets could be printed because there is "
2867 "no space left on the file system.\n");
2873 "tethereal: Not all the packets could be printed because you are "
2874 "too close to, or over your disk quota.\n");
2880 "tethereal: An error occurred while printing packets: %s.\n",
2887 cf_open_error_message(int err, gchar *err_info, gboolean for_writing,
2891 static char errmsg_errno[1024+1];
2894 /* Wiretap error. */
2897 case WTAP_ERR_NOT_REGULAR_FILE:
2898 errmsg = "The file \"%s\" is a \"special file\" or socket or other non-regular file.";
2901 case WTAP_ERR_FILE_UNKNOWN_FORMAT:
2902 /* Seen only when opening a capture file for reading. */
2903 errmsg = "The file \"%s\" isn't a capture file in a format Tethereal understands.";
2906 case WTAP_ERR_UNSUPPORTED:
2907 /* Seen only when opening a capture file for reading. */
2908 g_snprintf(errmsg_errno, sizeof(errmsg_errno),
2909 "The file \"%%s\" isn't a capture file in a format Tethereal understands.\n"
2912 errmsg = errmsg_errno;
2915 case WTAP_ERR_CANT_WRITE_TO_PIPE:
2916 /* Seen only when opening a capture file for writing. */
2917 g_snprintf(errmsg_errno, sizeof(errmsg_errno),
2918 "The file \"%%s\" is a pipe, and %s capture files can't be "
2919 "written to a pipe.", wtap_file_type_string(file_type));
2920 errmsg = errmsg_errno;
2923 case WTAP_ERR_UNSUPPORTED_FILE_TYPE:
2924 /* Seen only when opening a capture file for writing. */
2925 errmsg = "Tethereal doesn't support writing capture files in that format.";
2928 case WTAP_ERR_UNSUPPORTED_ENCAP:
2930 errmsg = "Tethereal can't save this capture in that format.";
2932 g_snprintf(errmsg_errno, sizeof(errmsg_errno),
2933 "The file \"%%s\" is a capture for a network type that Tethereal doesn't support.\n"
2936 errmsg = errmsg_errno;
2940 case WTAP_ERR_ENCAP_PER_PACKET_UNSUPPORTED:
2942 errmsg = "Tethereal can't save this capture in that format.";
2944 errmsg = "The file \"%s\" is a capture for a network type that Tethereal doesn't support.";
2947 case WTAP_ERR_BAD_RECORD:
2948 /* Seen only when opening a capture file for reading. */
2949 g_snprintf(errmsg_errno, sizeof(errmsg_errno),
2950 "The file \"%%s\" appears to be damaged or corrupt.\n"
2953 errmsg = errmsg_errno;
2956 case WTAP_ERR_CANT_OPEN:
2958 errmsg = "The file \"%s\" could not be created for some unknown reason.";
2960 errmsg = "The file \"%s\" could not be opened for some unknown reason.";
2963 case WTAP_ERR_SHORT_READ:
2964 errmsg = "The file \"%s\" appears to have been cut short"
2965 " in the middle of a packet or other data.";
2968 case WTAP_ERR_SHORT_WRITE:
2969 errmsg = "A full header couldn't be written to the file \"%s\".";
2973 g_snprintf(errmsg_errno, sizeof(errmsg_errno),
2974 "The file \"%%s\" could not be %s: %s.",
2975 for_writing ? "created" : "opened",
2976 wtap_strerror(err));
2977 errmsg = errmsg_errno;
2981 errmsg = file_open_error_message(err, for_writing);
2986 * Open/create errors are reported with an console message in Tethereal.
2989 open_failure_message(const char *filename, int err, gboolean for_writing)
2991 fprintf(stderr, "tethereal: ");
2992 fprintf(stderr, file_open_error_message(err, for_writing), filename);
2993 fprintf(stderr, "\n");
2997 cf_open(capture_file *cf, const char *fname, gboolean is_tempfile, int *err)
3001 char err_msg[2048+1];
3003 wth = wtap_open_offline(fname, err, &err_info, FALSE);
3007 /* The open succeeded. Fill in the information for this file. */
3009 /* Initialize all data structures used for dissection. */
3013 cf->f_datalen = 0; /* not used, but set it anyway */
3015 /* Set the file name because we need it to set the follow stream filter.
3016 XXX - is that still true? We need it for other reasons, though,
3018 cf->filename = g_strdup(fname);
3020 /* Indicate whether it's a permanent or temporary file. */
3021 cf->is_tempfile = is_tempfile;
3023 /* If it's a temporary capture buffer file, mark it as not saved. */
3024 cf->user_saved = !is_tempfile;
3026 cf->cd_t = wtap_file_type(cf->wth);
3028 cf->drops_known = FALSE;
3030 cf->snap = wtap_snapshot_length(cf->wth);
3031 if (cf->snap == 0) {
3032 /* Snapshot length not known. */
3033 cf->has_snap = FALSE;
3034 cf->snap = WTAP_MAX_PACKET_SIZE;
3036 cf->has_snap = TRUE;
3037 nstime_set_zero(&cf->elapsed_time);
3038 nstime_set_zero(&first_ts);
3039 nstime_set_zero(&prev_ts);
3044 g_snprintf(err_msg, sizeof err_msg,
3045 cf_open_error_message(*err, err_info, FALSE, 0), fname);
3046 fprintf(stderr, "tethereal: %s\n", err_msg);
3052 /* Take care of byte order in the libpcap headers read from pipes.
3053 * (function taken from wiretap/libpcap.c) */
3055 adjust_header(loop_data *ldat, struct pcap_hdr *hdr, struct pcaprec_hdr *rechdr)
3057 if (ldat->byte_swapped) {
3058 /* Byte-swap the record header fields. */
3059 rechdr->ts_sec = BSWAP32(rechdr->ts_sec);
3060 rechdr->ts_usec = BSWAP32(rechdr->ts_usec);
3061 rechdr->incl_len = BSWAP32(rechdr->incl_len);
3062 rechdr->orig_len = BSWAP32(rechdr->orig_len);
3065 /* In file format version 2.3, the "incl_len" and "orig_len" fields were
3066 swapped, in order to match the BPF header layout.
3068 Unfortunately, some files were, according to a comment in the "libpcap"
3069 source, written with version 2.3 in their headers but without the
3070 interchanged fields, so if "incl_len" is greater than "orig_len" - which
3071 would make no sense - we assume that we need to swap them. */
3072 if (hdr->version_major == 2 &&
3073 (hdr->version_minor < 3 ||
3074 (hdr->version_minor == 3 && rechdr->incl_len > rechdr->orig_len))) {
3077 temp = rechdr->orig_len;
3078 rechdr->orig_len = rechdr->incl_len;
3079 rechdr->incl_len = temp;
3083 /* Mimic pcap_open_live() for pipe captures
3084 * We check if "pipename" is "-" (stdin) or a FIFO, open it, and read the
3086 * N.B. : we can't read the libpcap formats used in RedHat 6.1 or SuSE 6.3
3087 * because we can't seek on pipes (see wiretap/libpcap.c for details) */
3089 pipe_open_live(char *pipename, struct pcap_hdr *hdr, loop_data *ldat,
3090 char *errmsg, int errmsgl)
3092 struct stat pipe_stat;
3096 unsigned int bytes_read;
3099 * XXX Tethereal blocks until we return
3101 if (strcmp(pipename, "-") == 0)
3102 fd = 0; /* read from stdin */
3104 if (eth_stat(pipename, &pipe_stat) < 0) {
3105 if (errno == ENOENT || errno == ENOTDIR)
3106 ldat->pipe_err = PIPNEXIST;
3108 g_snprintf(errmsg, errmsgl,
3109 "The capture session could not be initiated "
3110 "due to error on pipe: %s", strerror(errno));
3111 ldat->pipe_err = PIPERR;
3115 if (! S_ISFIFO(pipe_stat.st_mode)) {
3116 if (S_ISCHR(pipe_stat.st_mode)) {
3118 * Assume the user specified an interface on a system where
3119 * interfaces are in /dev. Pretend we haven't seen it.
3121 ldat->pipe_err = PIPNEXIST;
3123 g_snprintf(errmsg, errmsgl,
3124 "The capture session could not be initiated because\n"
3125 "\"%s\" is neither an interface nor a pipe", pipename);
3126 ldat->pipe_err = PIPERR;
3130 fd = eth_open(pipename, O_RDONLY, 0000 /* no creation so don't matter */);
3132 g_snprintf(errmsg, errmsgl,
3133 "The capture session could not be initiated "
3134 "due to error on pipe open: %s", strerror(errno));
3135 ldat->pipe_err = PIPERR;
3140 ldat->from_pipe = TRUE;
3142 /* read the pcap header */
3144 while (bytes_read < sizeof magic) {
3145 b = read(fd, ((char *)&magic)+bytes_read, sizeof magic-bytes_read);
3148 g_snprintf(errmsg, errmsgl, "End of file on pipe during open");
3150 g_snprintf(errmsg, errmsgl, "Error on pipe during open: %s",
3159 /* Host that wrote it has our byte order, and was running
3160 a program using either standard or ss990417 libpcap. */
3161 ldat->byte_swapped = FALSE;
3162 ldat->modified = FALSE;
3164 case PCAP_MODIFIED_MAGIC:
3165 /* Host that wrote it has our byte order, but was running
3166 a program using either ss990915 or ss991029 libpcap. */
3167 ldat->byte_swapped = FALSE;
3168 ldat->modified = TRUE;
3170 case PCAP_SWAPPED_MAGIC:
3171 /* Host that wrote it has a byte order opposite to ours,
3172 and was running a program using either standard or
3173 ss990417 libpcap. */
3174 ldat->byte_swapped = TRUE;
3175 ldat->modified = FALSE;
3177 case PCAP_SWAPPED_MODIFIED_MAGIC:
3178 /* Host that wrote it out has a byte order opposite to
3179 ours, and was running a program using either ss990915
3180 or ss991029 libpcap. */
3181 ldat->byte_swapped = TRUE;
3182 ldat->modified = TRUE;
3185 /* Not a "libpcap" type we know about. */
3186 g_snprintf(errmsg, errmsgl, "Unrecognized libpcap format");
3190 /* Read the rest of the header */
3192 while (bytes_read < sizeof(struct pcap_hdr)) {
3193 b = read(fd, ((char *)hdr)+bytes_read,
3194 sizeof(struct pcap_hdr) - bytes_read);
3197 g_snprintf(errmsg, errmsgl, "End of file on pipe during open");
3199 g_snprintf(errmsg, errmsgl, "Error on pipe during open: %s",
3206 if (ldat->byte_swapped) {
3207 /* Byte-swap the header fields about which we care. */
3208 hdr->version_major = BSWAP16(hdr->version_major);
3209 hdr->version_minor = BSWAP16(hdr->version_minor);
3210 hdr->snaplen = BSWAP32(hdr->snaplen);
3211 hdr->network = BSWAP32(hdr->network);
3214 if (hdr->version_major < 2) {
3215 g_snprintf(errmsg, errmsgl, "Unable to read old libpcap format");
3219 ldat->pipe_state = STATE_EXPECT_REC_HDR;
3220 ldat->pipe_err = PIPOK;
3224 ldat->pipe_err = PIPERR;
3229 /* We read one record from the pipe, take care of byte order in the record
3230 * header, write the record in the capture file, and update capture statistics. */
3233 pipe_dispatch(int fd, loop_data *ldat, struct pcap_hdr *hdr,
3234 struct pcaprec_modified_hdr *rechdr, guchar *data,
3235 char *errmsg, int errmsgl)
3237 struct pcap_pkthdr phdr;
3239 enum { PD_REC_HDR_READ, PD_DATA_READ, PD_PIPE_EOF, PD_PIPE_ERR,
3242 switch (ldat->pipe_state) {
3244 case STATE_EXPECT_REC_HDR:
3245 ldat->bytes_to_read = ldat->modified ?
3246 sizeof(struct pcaprec_modified_hdr) : sizeof(struct pcaprec_hdr);
3247 ldat->bytes_read = 0;
3248 ldat->pipe_state = STATE_READ_REC_HDR;
3251 case STATE_READ_REC_HDR:
3252 b = read(fd, ((char *)rechdr)+ldat->bytes_read,
3253 ldat->bytes_to_read - ldat->bytes_read);
3256 result = PD_PIPE_EOF;
3258 result = PD_PIPE_ERR;
3261 if ((ldat->bytes_read += b) < ldat->bytes_to_read)
3263 result = PD_REC_HDR_READ;
3266 case STATE_EXPECT_DATA:
3267 ldat->bytes_read = 0;
3268 ldat->pipe_state = STATE_READ_DATA;
3271 case STATE_READ_DATA:
3272 b = read(fd, data+ldat->bytes_read, rechdr->hdr.incl_len - ldat->bytes_read);
3275 result = PD_PIPE_EOF;
3277 result = PD_PIPE_ERR;
3280 if ((ldat->bytes_read += b) < rechdr->hdr.incl_len)
3282 result = PD_DATA_READ;
3286 g_snprintf(errmsg, errmsgl, "pipe_dispatch: invalid state");
3289 } /* switch (ldat->pipe_state) */
3292 * We've now read as much data as we were expecting, so process it.
3296 case PD_REC_HDR_READ:
3297 /* We've read the header. Take care of byte order. */
3298 adjust_header(ldat, hdr, &rechdr->hdr);
3299 if (rechdr->hdr.incl_len > WTAP_MAX_PACKET_SIZE) {
3300 g_snprintf(errmsg, errmsgl, "Frame %u too long (%d bytes)",
3301 ldat->packet_count+1, rechdr->hdr.incl_len);
3304 ldat->pipe_state = STATE_EXPECT_DATA;
3308 /* Fill in a "struct pcap_pkthdr", and process the packet. */
3309 phdr.ts.tv_sec = rechdr->hdr.ts_sec;
3310 phdr.ts.tv_usec = rechdr->hdr.ts_usec;
3311 phdr.caplen = rechdr->hdr.incl_len;
3312 phdr.len = rechdr->hdr.orig_len;
3314 capture_pcap_cb((u_char *)ldat, &phdr, data);
3316 ldat->pipe_state = STATE_EXPECT_REC_HDR;
3320 ldat->pipe_err = PIPEOF;
3324 g_snprintf(errmsg, errmsgl, "Error reading from pipe: %s",
3331 ldat->pipe_err = PIPERR;
3332 /* Return here rather than inside the switch to prevent GCC warning */
3336 #endif /* HAVE_LIBPCAP */
3339 * General errors are reported with an console message in Tethereal.
3342 failure_message(const char *msg_format, va_list ap)
3344 fprintf(stderr, "tethereal: ");
3345 vfprintf(stderr, msg_format, ap);
3346 fprintf(stderr, "\n");
3350 * Read errors are reported with an console message in Tethereal.
3353 read_failure_message(const char *filename, int err)
3355 fprintf(stderr, "tethereal: An error occurred while reading from the file \"%s\": %s.\n",
3356 filename, strerror(err));