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"
100 #endif /* HAVE_LIBPCAP */
101 #include "epan/emem.h"
104 * This is the template for the decode as option; it is shared between the
105 * various functions that output the usage for this parameter.
107 static const gchar decode_as_arg_template[] = "<layer_type>==<selector>,<decode_as_protocol>";
109 static nstime_t first_ts;
110 static nstime_t prev_ts;
111 static GString *comp_info_str, *runtime_info_str;
113 static gboolean print_packet_info; /* TRUE if we're to print packet information */
115 * The way the packet decode is to be written.
118 WRITE_TEXT, /* summary or detail text */
119 WRITE_XML /* PDML or PSML */
120 /* Add CSV and the like here */
122 static output_action_e output_action;
123 static gboolean do_dissection; /* TRUE if we have to dissect each packet */
124 static gboolean verbose;
125 static gboolean print_hex;
126 static gboolean line_buffered;
127 static guint32 cum_bytes = 0;
128 static print_format_e print_format = PR_FMT_TEXT;
129 static print_stream_t *print_stream;
133 * TRUE if we're to print packet counts to keep track of captured packets.
135 static gboolean print_packet_counts;
137 typedef struct _loop_data {
138 gboolean go; /* TRUE as long as we're supposed to keep capturing */
140 gboolean from_pipe; /* TRUE if we are capturing data from a pipe */
142 char *save_file; /* Name of file to which we're writing */
145 gboolean output_to_pipe;
148 gboolean modified; /* TRUE if data in the pipe uses modified pcap headers */
149 gboolean byte_swapped; /* TRUE if data in the pipe is byte swapped */
150 unsigned int bytes_to_read, bytes_read; /* Used by pipe_dispatch */
152 STATE_EXPECT_REC_HDR, STATE_READ_REC_HDR,
153 STATE_EXPECT_DATA, STATE_READ_DATA
155 enum { PIPOK, PIPEOF, PIPERR, PIPNEXIST } pipe_err;
162 static capture_options capture_opts;
166 static gboolean infodelay; /* if TRUE, don't print capture info in SIGINFO handler */
167 static gboolean infoprint; /* if TRUE, print capture info after clearing infodelay */
169 #endif /* HAVE_LIBPCAP */
172 static int capture(char *, int);
173 static void capture_pcap_cb(u_char *, const struct pcap_pkthdr *,
175 static void report_counts(void);
177 static BOOL WINAPI capture_cleanup(DWORD);
179 static void capture_cleanup(int);
181 static void report_counts_siginfo(int);
184 #endif /* HAVE_LIBPCAP */
186 static int load_cap_file(capture_file *, char *, int);
187 static gboolean process_packet(capture_file *cf, wtap_dumper *pdh, long offset,
188 const struct wtap_pkthdr *whdr, union wtap_pseudo_header *pseudo_header,
189 const guchar *pd, int *err);
190 static void show_capture_file_io_error(const char *, int, gboolean);
191 static void show_print_file_io_error(int err);
192 static gboolean write_preamble(capture_file *cf);
193 static gboolean print_packet(capture_file *cf, epan_dissect_t *edt);
194 static gboolean write_finale(void);
195 static const char *cf_open_error_message(int err, gchar *err_info,
196 gboolean for_writing, int file_type);
199 static void adjust_header(loop_data *, struct pcap_hdr *, struct pcaprec_hdr *);
200 static int pipe_open_live(char *, struct pcap_hdr *, loop_data *, char *, int);
201 static int pipe_dispatch(int, loop_data *, struct pcap_hdr *, \
202 struct pcaprec_modified_hdr *, guchar *, char *, int);
206 static void open_failure_message(const char *filename, int err,
207 gboolean for_writing);
208 static void failure_message(const char *msg_format, va_list ap);
209 static void read_failure_message(const char *filename, int err);
215 print_usage(gboolean print_ver)
222 fprintf(output, "This is t" PACKAGE " " VERSION "%s"
223 "\n (C) 1998-2005 Gerald Combs <gerald@ethereal.com>"
226 svnversion, comp_info_str->str, runtime_info_str->str);
231 fprintf(output, "\nt%s [ -vh ] [ -DlLnpqSVx ] [ -a <capture autostop condition> ] ...\n",
233 fprintf(output, "\t[ -b <capture ring buffer option> ] ... [ -c <capture packet count> ]\n");
234 fprintf(output, "\t[ -d %s ] ...\n", decode_as_arg_template);
235 fprintf(output, "\t[ -f <capture filter> ] [ -F <output file type> ]\n");
236 fprintf(output, "\t[ -i <capture interface> ] [ -N <name resolving flags> ]\n");
237 fprintf(output, "\t[ -o <preference setting> ] ... [ -r <infile> ]\n");
238 fprintf(output, "\t[ -R <read (display) filter> ] [ -s <capture snaplen> ]\n");
239 fprintf(output, "\t[ -t <time stamp format> ] [ -T pdml|ps|psml|text ]\n");
240 fprintf(output, "\t[ -w <savefile> ] [ -y <capture link type> ] [ -z <statistics> ]\n");
242 fprintf(output, "\nt%s [ -vh ] [ -lnVx ]\n", PACKAGE);
243 fprintf(output, "\t[ -d %s ] ...\n", decode_as_arg_template);
244 fprintf(output, "\t[ -F <output file type> ] [ -N <name resolving flags> ]\n");
245 fprintf(output, "\t[ -o <preference setting> ] ... [ -r <infile> ]\n");
246 fprintf(output, "\t[ -R <read (display) filter> ] \t[ -t <time stamp format> ]\n");
247 fprintf(output, "\t[ -T pdml|ps|psml|text ] [ -w <savefile> ] [ -z <statistics ]\n");
249 fprintf(output, "Valid file type arguments to the \"-F\" flag:\n");
250 for (i = 0; i < WTAP_NUM_FILE_TYPES; i++) {
251 if (wtap_dump_can_open(i))
252 fprintf(output, "\t%s - %s\n",
253 wtap_file_type_short_string(i), wtap_file_type_string(i));
255 fprintf(output, "\tdefault is libpcap\n");
259 * For a dissector table, print on the stream described by output,
260 * its short name (which is what's used in the "-d" option) and its
264 display_dissector_table_names(char *table_name, const char *ui_name,
267 fprintf((FILE *)output, "\t%s (%s)\n", table_name, ui_name);
271 * For a dissector handle, print on the stream described by output,
272 * the filter name (which is what's used in the "-d" option) and the full
273 * name for the protocol that corresponds to this handle.
276 display_dissector_names(const gchar *table _U_, gpointer handle, gpointer output)
279 const gchar* proto_filter_name;
280 const gchar* proto_ui_name;
282 proto_id = dissector_handle_get_protocol_index((dissector_handle_t)handle);
284 if (proto_id != -1) {
285 proto_filter_name = proto_get_protocol_filter_name(proto_id);
286 proto_ui_name = proto_get_protocol_name(proto_id);
287 g_assert(proto_filter_name != NULL);
288 g_assert(proto_ui_name != NULL);
290 fprintf((FILE *)output, "\t%s (%s)\n",
297 * The protocol_name_search structure is used by find_protocol_name_func()
298 * to pass parameters and store results
300 struct protocol_name_search{
301 gchar *searched_name; /* Protocol filter name we are looking for */
302 dissector_handle_t matched_handle; /* Handle for a dissector whose protocol has the specified filter name */
303 guint nb_match; /* How many dissectors matched searched_name */
305 typedef struct protocol_name_search *protocol_name_search_t;
308 * This function parses all dissectors associated with a table to find the
309 * one whose protocol has the specified filter name. It is called
310 * as a reference function in a call to dissector_table_foreach_handle.
311 * The name we are looking for, as well as the results, are stored in the
312 * protocol_name_search struct pointed to by user_data.
313 * If called using dissector_table_foreach_handle, we actually parse the
314 * whole list of dissectors.
317 find_protocol_name_func(const gchar *table _U_, gpointer handle, gpointer user_data)
321 const gchar *protocol_filter_name;
322 protocol_name_search_t search_info;
326 search_info = (protocol_name_search_t)user_data;
328 proto_id = dissector_handle_get_protocol_index((dissector_handle_t)handle);
329 if (proto_id != -1) {
330 protocol_filter_name = proto_get_protocol_filter_name(proto_id);
331 g_assert(protocol_filter_name != NULL);
332 if (strcmp(protocol_filter_name, search_info->searched_name) == 0) {
334 if (search_info->nb_match == 0) {
335 /* Record this handle only if this is the first match */
336 search_info->matched_handle = (dissector_handle_t)handle; /* Record the handle for this matching dissector */
338 search_info->nb_match++;
344 * Print all layer type names supported.
345 * We send the output to the stream described by the handle output.
349 fprint_all_layer_types(FILE *output)
352 dissector_all_tables_foreach_table(display_dissector_table_names, (gpointer)output);
356 * Print all protocol names supported for a specific layer type.
357 * table_name contains the layer type name in which the search is performed.
358 * We send the output to the stream described by the handle output.
362 fprint_all_protocols_for_layer_types(FILE *output, gchar *table_name)
365 dissector_table_foreach_handle(table_name,
366 display_dissector_names,
371 * The function below parses the command-line parameters for the decode as
372 * feature (a string pointer by cl_param).
373 * It checks the format of the command-line, searches for a matching table
374 * and dissector. If a table/dissector match is not found, we display a
375 * summary of the available tables/dissectors (on stderr) and return FALSE.
376 * If everything is fine, we get the "Decode as" preference activated,
377 * then we return TRUE.
380 add_decode_as(const gchar *cl_param)
384 gchar *decoded_param;
385 gchar *remaining_param;
387 gchar *dissector_str;
388 dissector_handle_t dissector_matching;
389 dissector_table_t table_matching;
390 ftenum_t dissector_table_selector_type;
391 struct protocol_name_search user_protocol_name;
393 /* The following code will allocate and copy the command-line options in a string pointed by decoded_param */
396 decoded_param = g_malloc( sizeof(gchar) * (strlen(cl_param) + 1) ); /* Allocate enough space to have a working copy of the command-line parameter */
397 g_assert(decoded_param);
398 strcpy(decoded_param, cl_param);
401 /* The lines below will parse this string (modifying it) to extract all
402 necessary information. Note that decoded_param is still needed since
403 strings are not copied - we just save pointers. */
405 /* This section extracts a layer type (table_name) from decoded_param */
406 table_name = decoded_param; /* Layer type string starts from beginning */
408 remaining_param = strchr(table_name, '=');
409 if (remaining_param == NULL) {
410 fprintf(stderr, "tethereal: Parameter \"%s\" doesn't follow the template \"%s\"\n", cl_param, decode_as_arg_template);
411 /* If the argument does not follow the template, carry on anyway to check
412 if the table name is at least correct. If remaining_param is NULL,
413 we'll exit anyway further down */
416 *remaining_param = '\0'; /* Terminate the layer type string (table_name) where '=' was detected */
419 /* Remove leading and trailing spaces from the table name */
420 while ( table_name[0] == ' ' )
422 while ( table_name[strlen(table_name) - 1] == ' ' )
423 table_name[strlen(table_name) - 1] = '\0'; /* Note: if empty string, while loop will eventually exit */
425 /* The following part searches a table matching with the layer type specified */
426 table_matching = NULL;
428 /* Look for the requested table */
429 if ( !(*(table_name)) ) { /* Is the table name empty, if so, don't even search for anything, display a message */
430 fprintf(stderr, "tethereal: No layer type specified\n"); /* Note, we don't exit here, but table_matching will remain NULL, so we exit below */
433 table_matching = find_dissector_table(table_name);
434 if (!table_matching) {
435 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 */
439 if (!table_matching) {
440 /* Display a list of supported layer types to help the user, if the
441 specified layer type was not found */
442 fprintf(stderr, "tethereal: Valid layer types are:\n");
443 fprint_all_layer_types(stderr);
445 if (remaining_param == NULL || !table_matching) {
446 /* Exit if the layer type was not found, or if no '=' separator was found
448 g_free(decoded_param);
452 if (*(remaining_param + 1) != '=') { /* Check for "==" and not only '=' */
453 fprintf(stderr, "tethereal: WARNING: -d requires \"==\" instead of \"=\". Option will be treated as \"%s==%s\"\n", table_name, remaining_param + 1);
456 remaining_param++; /* Move to the second '=' */
457 *remaining_param = '\0'; /* Remove the second '=' */
459 remaining_param++; /* Position after the layer type string */
461 /* This section extracts a selector value (selector_str) from decoded_param */
463 selector_str = remaining_param; /* Next part starts with the selector number */
465 remaining_param = strchr(selector_str, ',');
466 if (remaining_param == NULL) {
467 fprintf(stderr, "tethereal: Parameter \"%s\" doesn't follow the template \"%s\"\n", cl_param, decode_as_arg_template);
468 /* If the argument does not follow the template, carry on anyway to check
469 if the selector value is at least correct. If remaining_param is NULL,
470 we'll exit anyway further down */
473 *remaining_param = '\0'; /* Terminate the selector number string (selector_str) where ',' was detected */
476 dissector_table_selector_type = get_dissector_table_selector_type(table_name);
478 switch (dissector_table_selector_type) {
484 /* The selector for this table is an unsigned number. Parse it as such.
485 There's no need to remove leading and trailing spaces from the
486 selector number string, because sscanf will do that for us. */
487 if ( sscanf(selector_str, "%u", &selector) != 1 ) {
488 fprintf(stderr, "tethereal: Invalid selector number \"%s\"\n", selector_str);
489 g_free(decoded_param);
496 /* The selector for this table is a string. */
500 /* There are currently no dissector tables with any types other
501 than the ones listed above. */
502 g_assert_not_reached();
505 if (remaining_param == NULL) {
506 /* Exit if no ',' separator was found (see above) */
507 fprintf(stderr, "tethereal: Valid protocols for layer type \"%s\" are:\n", table_name);
508 fprint_all_protocols_for_layer_types(stderr, table_name);
509 g_free(decoded_param);
513 remaining_param++; /* Position after the selector number string */
515 /* This section extracts a protocol filter name (dissector_str) from decoded_param */
517 dissector_str = remaining_param; /* All the rest of the string is the dissector (decode as protocol) name */
519 /* Remove leading and trailing spaces from the dissector name */
520 while ( dissector_str[0] == ' ' )
522 while ( dissector_str[strlen(dissector_str) - 1] == ' ' )
523 dissector_str[strlen(dissector_str) - 1] = '\0'; /* Note: if empty string, while loop will eventually exit */
525 dissector_matching = NULL;
527 /* We now have a pointer to the handle for the requested table inside the variable table_matching */
528 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 */
529 fprintf(stderr, "tethereal: No protocol name specified\n"); /* Note, we don't exit here, but dissector_matching will remain NULL, so we exit below */
532 user_protocol_name.nb_match = 0;
533 user_protocol_name.searched_name = dissector_str;
534 user_protocol_name.matched_handle = NULL;
536 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 */
538 if (user_protocol_name.nb_match != 0) {
539 dissector_matching = user_protocol_name.matched_handle;
540 if (user_protocol_name.nb_match > 1) {
541 fprintf(stderr, "tethereal: WARNING: Protocol \"%s\" matched %u dissectors, first one will be used\n", dissector_str, user_protocol_name.nb_match);
545 /* OK, check whether the problem is that there isn't any such
546 protocol, or that there is but it's not specified as a protocol
547 that's valid for that dissector table.
548 Note, we don't exit here, but dissector_matching will remain NULL,
550 if (proto_get_id_by_filter_name(dissector_str) == -1) {
551 /* No such protocol */
552 fprintf(stderr, "tethereal: Unknown protocol -- \"%s\"\n", dissector_str);
554 fprintf(stderr, "tethereal: Protocol \"%s\" isn't valid for layer type \"%s\"\n",
555 dissector_str, table_name);
560 if (!dissector_matching) {
561 fprintf(stderr, "tethereal: Valid protocols for layer type \"%s\" are:\n", table_name);
562 fprint_all_protocols_for_layer_types(stderr, table_name);
563 g_free(decoded_param);
567 /* This is the end of the code that parses the command-line options.
568 All information is now stored in the variables:
572 The above variables that are strings are still pointing to areas within
573 decoded_parm. decoded_parm thus still needs to be kept allocated in
574 until we stop needing these variables
575 decoded_param will be deallocated at each exit point of this function */
578 /* We now have a pointer to the handle for the requested dissector
579 (requested protocol) inside the variable dissector_matching */
580 switch (dissector_table_selector_type) {
586 /* The selector for this table is an unsigned number. */
587 dissector_change(table_name, selector, dissector_matching);
592 /* The selector for this table is a string. */
593 dissector_change_string(table_name, selector_str, dissector_matching);
597 /* There are currently no dissector tables with any types other
598 than the ones listed above. */
599 g_assert_not_reached();
601 g_free(decoded_param); /* "Decode As" rule has been succesfully added */
606 main(int argc, char *argv[])
610 gboolean arg_error = FALSE;
616 char *gpf_path, *pf_path;
617 char *gdp_path, *dp_path;
618 int gpf_open_errno, gpf_read_errno;
619 int pf_open_errno, pf_read_errno;
620 int gdp_open_errno, gdp_read_errno;
621 int dp_open_errno, dp_read_errno;
624 gboolean capture_filter_specified = FALSE;
625 GList *if_list, *if_entry;
629 gchar err_str[PCAP_ERRBUF_SIZE];
630 gchar *cant_get_if_list_errstr;
631 gboolean list_link_layer_types = FALSE;
633 gboolean capture_option_specified = FALSE;
635 gboolean quiet = FALSE;
636 gchar *save_file = NULL;
637 int out_file_type = WTAP_FILE_PCAP;
638 gchar *cf_name = NULL, *rfilter = NULL;
640 gboolean start_capture = FALSE;
642 GList *lt_list, *lt_entry;
643 data_link_info_t *data_link_info;
645 #ifdef HAVE_PCAP_OPEN_DEAD
646 struct bpf_program fcode;
648 dfilter_t *rfcode = NULL;
652 /* initialize memory allocation subsystem */
657 capture_opts_init(&capture_opts, NULL /* cfile */);
660 timestamp_set_type(TS_RELATIVE);
661 timestamp_set_precision(TS_PREC_AUTO);
663 /* Register all dissectors; we must do this before checking for the
664 "-G" flag, as the "-G" flag dumps information registered by the
665 dissectors, and we must do it before we read the preferences, in
666 case any dissectors register preferences. */
667 epan_init(PLUGIN_DIR,register_all_protocols,register_all_protocol_handoffs,
668 failure_message,open_failure_message,read_failure_message);
670 /* Register all tap listeners; we do this before we parse the arguments,
671 as the "-z" argument can specify a registered tap. */
673 /* we register the plugin taps before the other taps because
674 stats_tree taps plugins will be registered as tap listeners
675 by stats_tree_stat.c and need to registered before that */
677 register_all_plugin_tap_listeners();
679 register_all_tap_listeners();
681 /* Now register the preferences for any non-dissector modules.
682 We must do that before we read the preferences as well. */
683 prefs_register_modules();
685 /* If invoked with the "-G" flag, we dump out information based on
686 the argument to the "-G" flag; if no argument is specified,
687 for backwards compatibility we dump out a glossary of display
690 We do this here to mirror what happens in the GTK+ version, although
691 it's not necessary here. */
692 handle_dashG_option(argc, argv, "tethereal");
694 /* Set the C-language locale to the native environment. */
695 setlocale(LC_ALL, "");
697 prefs = read_prefs(&gpf_open_errno, &gpf_read_errno, &gpf_path,
698 &pf_open_errno, &pf_read_errno, &pf_path);
699 if (gpf_path != NULL) {
700 if (gpf_open_errno != 0) {
701 fprintf(stderr, "Can't open global preferences file \"%s\": %s.\n",
702 pf_path, strerror(gpf_open_errno));
704 if (gpf_read_errno != 0) {
705 fprintf(stderr, "I/O error reading global preferences file \"%s\": %s.\n",
706 pf_path, strerror(gpf_read_errno));
709 if (pf_path != NULL) {
710 if (pf_open_errno != 0) {
711 fprintf(stderr, "Can't open your preferences file \"%s\": %s.\n", pf_path,
712 strerror(pf_open_errno));
714 if (pf_read_errno != 0) {
715 fprintf(stderr, "I/O error reading your preferences file \"%s\": %s.\n",
716 pf_path, strerror(pf_read_errno));
722 /* Set the name resolution code's flags from the preferences. */
723 g_resolv_flags = prefs->name_resolve;
725 /* Read the disabled protocols file. */
726 read_disabled_protos_list(&gdp_path, &gdp_open_errno, &gdp_read_errno,
727 &dp_path, &dp_open_errno, &dp_read_errno);
728 if (gdp_path != NULL) {
729 if (gdp_open_errno != 0) {
731 "Could not open global disabled protocols file\n\"%s\": %s.\n",
732 gdp_path, strerror(gdp_open_errno));
734 if (gdp_read_errno != 0) {
736 "I/O error reading global disabled protocols file\n\"%s\": %s.\n",
737 gdp_path, strerror(gdp_read_errno));
741 if (dp_path != NULL) {
742 if (dp_open_errno != 0) {
744 "Could not open your disabled protocols file\n\"%s\": %s.\n", dp_path,
745 strerror(dp_open_errno));
747 if (dp_read_errno != 0) {
749 "I/O error reading your disabled protocols file\n\"%s\": %s.\n", dp_path,
750 strerror(dp_read_errno));
756 /* Load Wpcap, if possible */
760 init_cap_file(&cfile);
762 /* Assemble the compile-time version information string */
763 comp_info_str = g_string_new("Compiled ");
764 get_compiled_version_info(comp_info_str);
766 /* Assemble the run-time version information string */
767 runtime_info_str = g_string_new("Running ");
768 get_runtime_version_info(runtime_info_str);
770 /* Print format defaults to this. */
771 print_format = PR_FMT_TEXT;
773 /* Now get our args */
774 while ((opt = getopt(argc, argv, "a:b:c:d:Df:F:hi:lLnN:o:pqr:R:s:St:T:vw:Vxy:z:")) != -1) {
776 case 'a': /* autostop criteria */
777 case 'b': /* Ringbuffer option */
778 case 'c': /* Capture xxx packets */
779 case 'f': /* capture filter */
780 case 'p': /* Don't capture in promiscuous mode */
781 case 's': /* Set the snapshot (capture) length */
782 case 'y': /* Set the pcap data link type */
784 capture_opts_add_opt(&capture_opts, "tethereal", opt, optarg, &start_capture);
786 capture_option_specified = TRUE;
790 case 'd': /* Decode as rule */
791 if (!add_decode_as(optarg))
794 case 'D': /* Print a list of capture devices */
796 if_list = get_interface_list(&err, err_str);
797 if (if_list == NULL) {
800 case CANT_GET_INTERFACE_LIST:
801 cant_get_if_list_errstr =
802 cant_get_if_list_error_message(err_str);
803 fprintf(stderr, "tethereal: %s\n", cant_get_if_list_errstr);
804 g_free(cant_get_if_list_errstr);
807 case NO_INTERFACES_FOUND:
808 fprintf(stderr, "tethereal: There are no interfaces on which a capture can be done\n");
813 i = 1; /* Interface id number */
814 for (if_entry = g_list_first(if_list); if_entry != NULL;
815 if_entry = g_list_next(if_entry)) {
816 if_info = if_entry->data;
817 printf("%d. %s", i++, if_info->name);
818 if (if_info->description != NULL)
819 printf(" (%s)", if_info->description);
822 free_interface_list(if_list);
825 capture_option_specified = TRUE;
830 out_file_type = wtap_short_string_to_file_type(optarg);
831 if (out_file_type < 0) {
832 fprintf(stderr, "tethereal: \"%s\" isn't a valid capture file type\n",
837 case 'h': /* Print help and exit */
841 case 'i': /* Use interface xxx */
844 * If the argument is a number, treat it as an index into the list
845 * of adapters, as printed by "tethereal -D".
847 * This should be OK on UNIX systems, as interfaces shouldn't have
848 * names that begin with digits. It can be useful on Windows, where
849 * more than one interface can have the same name.
851 adapter_index = strtol(optarg, &p, 10);
852 if (p != NULL && *p == '\0') {
853 if (adapter_index < 0) {
855 "tethereal: The specified adapter index is a negative number\n");
858 if (adapter_index > INT_MAX) {
860 "tethereal: The specified adapter index is too large (greater than %d)\n",
864 if (adapter_index == 0) {
865 fprintf(stderr, "tethereal: there is no interface with that adapter index\n");
868 if_list = get_interface_list(&err, err_str);
869 if (if_list == NULL) {
872 case CANT_GET_INTERFACE_LIST:
873 cant_get_if_list_errstr =
874 cant_get_if_list_error_message(err_str);
875 fprintf(stderr, "tethereal: %s\n", cant_get_if_list_errstr);
876 g_free(cant_get_if_list_errstr);
879 case NO_INTERFACES_FOUND:
880 fprintf(stderr, "tethereal: There are no interfaces on which a capture can be done\n");
885 if_info = g_list_nth_data(if_list, adapter_index - 1);
886 if (if_info == NULL) {
887 fprintf(stderr, "tethereal: there is no interface with that adapter index\n");
890 capture_opts.iface = g_strdup(if_info->name);
891 free_interface_list(if_list);
893 capture_opts.iface = g_strdup(optarg);
895 capture_option_specified = TRUE;
899 case 'l': /* "Line-buffer" standard output */
900 /* This isn't line-buffering, strictly speaking, it's just
901 flushing the standard output after the information for
902 each packet is printed; however, that should be good
903 enough for all the purposes to which "-l" is put (and
904 is probably actually better for "-V", as it does fewer
907 See the comment in "process_packet()" for an explanation of
908 why we do that, and why we don't just use "setvbuf()" to
909 make the standard output line-buffered (short version: in
910 Windows, "line-buffered" is the same as "fully-buffered",
911 and the output buffer is only flushed when it fills up). */
912 line_buffered = TRUE;
914 case 'L': /* Print list of link-layer types and exit */
916 list_link_layer_types = TRUE;
919 capture_option_specified = TRUE;
923 case 'n': /* No name resolution */
924 g_resolv_flags = RESOLV_NONE;
926 case 'N': /* Select what types of addresses/port #s to resolve */
927 if (g_resolv_flags == RESOLV_ALL)
928 g_resolv_flags = RESOLV_NONE;
929 badopt = string_to_name_resolve(optarg, &g_resolv_flags);
930 if (badopt != '\0') {
931 fprintf(stderr, "tethereal: -N specifies unknown resolving option '%c'; valid options are 'm', 'n', and 't'\n",
936 case 'o': /* Override preference from command line */
937 switch (prefs_set_pref(optarg)) {
939 case PREFS_SET_SYNTAX_ERR:
940 fprintf(stderr, "tethereal: Invalid -o flag \"%s\"\n", optarg);
944 case PREFS_SET_NO_SUCH_PREF:
945 case PREFS_SET_OBSOLETE:
946 fprintf(stderr, "tethereal: -o flag \"%s\" specifies unknown preference\n",
952 case 'q': /* Quiet */
955 case 'r': /* Read capture file xxx */
956 cf_name = g_strdup(optarg);
958 case 'R': /* Read file filter */
961 case 'S': /* show packets in real time */
962 print_packet_info = TRUE;
964 case 't': /* Time stamp type */
965 if (strcmp(optarg, "r") == 0)
966 timestamp_set_type(TS_RELATIVE);
967 else if (strcmp(optarg, "a") == 0)
968 timestamp_set_type(TS_ABSOLUTE);
969 else if (strcmp(optarg, "ad") == 0)
970 timestamp_set_type(TS_ABSOLUTE_WITH_DATE);
971 else if (strcmp(optarg, "d") == 0)
972 timestamp_set_type(TS_DELTA);
974 fprintf(stderr, "tethereal: Invalid time stamp type \"%s\"\n",
976 fprintf(stderr, "It must be \"r\" for relative, \"a\" for absolute,\n");
977 fprintf(stderr, "\"ad\" for absolute with date, or \"d\" for delta.\n");
981 case 'T': /* printing Type */
982 if (strcmp(optarg, "text") == 0) {
983 output_action = WRITE_TEXT;
984 print_format = PR_FMT_TEXT;
985 } else if (strcmp(optarg, "ps") == 0) {
986 output_action = WRITE_TEXT;
987 print_format = PR_FMT_PS;
988 } else if (strcmp(optarg, "pdml") == 0) {
989 output_action = WRITE_XML;
991 } else if (strcmp(optarg, "psml") == 0) {
992 output_action = WRITE_XML;
995 fprintf(stderr, "tethereal: Invalid -T parameter.\n");
996 fprintf(stderr, "It must be \"ps\", \"text\", \"pdml\", or \"psml\".\n");
1000 case 'v': /* Show version and exit */
1001 printf("t" PACKAGE " " VERSION "%s\n%s\n%s\n",
1002 svnversion, comp_info_str->str, runtime_info_str->str);
1005 case 'w': /* Write to capture file xxx */
1006 save_file = g_strdup(optarg);
1008 case 'V': /* Verbose */
1011 case 'x': /* Print packet data in hex (and ASCII) */
1015 /* We won't call the init function for the stat this soon
1016 as it would disallow MATE's fields (which are registered
1017 by the preferences set callback) from being used as
1018 part of a tap filter. Instead, we just add the argument
1019 to a list of stat arguments. */
1020 if (!process_stat_cmd_arg(optarg)) {
1021 fprintf(stderr,"tethereal: invalid -z argument.\n");
1022 fprintf(stderr," -z argument must be one of :\n");
1023 list_stat_cmd_args();
1028 case '?': /* Bad flag - print usage message */
1034 /* If no capture filter or read filter has been specified, and there are
1035 still command-line arguments, treat them as the tokens of a capture
1036 filter (if no "-r" flag was specified) or a read filter (if a "-r"
1037 flag was specified. */
1038 if (optind < argc) {
1039 if (cf_name != NULL) {
1040 if (rfilter != NULL) {
1042 "tethereal: Read filters were specified both with \"-R\" and with additional command-line arguments\n");
1045 rfilter = get_args_as_string(argc, argv, optind);
1048 if (capture_filter_specified) {
1050 "tethereal: Capture filters were specified both with \"-f\" and with additional command-line arguments\n");
1053 capture_opts.cfilter = get_args_as_string(argc, argv, optind);
1055 capture_option_specified = TRUE;
1060 /* See if we're writing a capture file and the file is a pipe */
1062 ld.output_to_pipe = FALSE;
1064 if (save_file != NULL) {
1065 /* We're writing to a capture file. */
1066 if (strcmp(save_file, "-") == 0) {
1067 /* Write to the standard output. */
1069 save_file = g_strdup("");
1071 /* XXX - should we check whether it's a pipe? It's arguably
1072 silly to do "-w - >output_file" rather than "-w output_file",
1073 but by not checking we might be violating the Principle Of
1074 Least Astonishment. */
1075 ld.output_to_pipe = TRUE;
1080 err = test_for_fifo(save_file);
1083 case ENOENT: /* it doesn't exist, so we'll be creating it,
1084 and it won't be a FIFO */
1085 case 0: /* found it, but it's not a FIFO */
1088 case ESPIPE: /* it is a FIFO */
1089 ld.output_to_pipe = TRUE;
1092 default: /* couldn't stat it */
1094 "tethereal: Error testing whether capture file is a pipe: %s\n",
1101 /* We're not writing to a file, so we should print packet information
1102 unless "-q" was specified. */
1104 print_packet_info = TRUE;
1107 #ifndef HAVE_LIBPCAP
1108 if (capture_option_specified)
1109 fprintf(stderr, "This version of Tethereal was not built with support for capturing packets.\n");
1116 /* We don't support capture filters when reading from a capture file
1117 (the BPF compiler doesn't support all link-layer types that we
1118 support in capture files we read). */
1120 if (cf_name != NULL) {
1121 if (capture_filter_specified) {
1123 "tethereal: Only read filters, not capture filters, can be specified when reading a capture file.\n");
1130 if (output_action != WRITE_TEXT) {
1131 fprintf(stderr, "tethereal: Raw packet hex data can only be printed as text or PostScript\n");
1137 if (list_link_layer_types) {
1138 /* We're supposed to list the link-layer types for an interface;
1139 did the user also specify a capture file to be read? */
1141 /* Yes - that's bogus. */
1142 fprintf(stderr, "tethereal: You can't specify -L and a capture file to be read.\n");
1145 /* No - did they specify a ring buffer option? */
1146 if (capture_opts.multi_files_on) {
1147 fprintf(stderr, "tethereal: Ring buffer requested, but a capture isn't being done.\n");
1151 /* If they didn't specify a "-w" flag, but specified a maximum capture
1152 file size, tell them that this doesn't work, and exit. */
1153 if (capture_opts.has_autostop_filesize && save_file == NULL) {
1154 fprintf(stderr, "tethereal: Maximum capture file size specified, but "
1155 "capture isn't being saved to a file.\n");
1159 if (capture_opts.multi_files_on) {
1160 /* Ring buffer works only under certain conditions:
1161 a) ring buffer does not work if you're not saving the capture to
1163 b) ring buffer only works if you're saving in libpcap format;
1164 c) it makes no sense to enable the ring buffer if the maximum
1165 file size is set to "infinite";
1166 d) file must not be a pipe. */
1167 if (save_file == NULL) {
1168 fprintf(stderr, "tethereal: Ring buffer requested, but "
1169 "capture isn't being saved to a file.\n");
1172 if (out_file_type != WTAP_FILE_PCAP) {
1173 fprintf(stderr, "tethereal: Ring buffer requested, but "
1174 "capture isn't being saved in libpcap format.\n");
1177 if (!capture_opts.has_autostop_filesize) {
1178 fprintf(stderr, "tethereal: Ring buffer requested, but "
1179 "no maximum capture file size was specified.\n");
1182 if (ld.output_to_pipe) {
1183 fprintf(stderr, "tethereal: Ring buffer requested, but "
1184 "capture file is a pipe.\n");
1192 /* Start windows sockets */
1193 WSAStartup( MAKEWORD( 1, 1 ), &wsaData );
1196 /* Notify all registered modules that have had any of their preferences
1197 changed either from one of the preferences file or from the command
1198 line that their preferences have changed. */
1201 /* At this point MATE will have registered its field array so we can
1202 have a tap filter with one of MATE's late-registered fields as part
1203 of the filter. We can now process all the "-z" arguments. */
1204 start_requested_stats();
1206 /* disabled protocols as per configuration file */
1207 if (gdp_path == NULL && dp_path == NULL) {
1208 set_disabled_protos_list();
1211 /* Build the column format array */
1212 col_setup(&cfile.cinfo, prefs->num_cols);
1213 for (i = 0; i < cfile.cinfo.num_cols; i++) {
1214 cfile.cinfo.col_fmt[i] = get_column_format(i);
1215 cfile.cinfo.col_title[i] = g_strdup(get_column_title(i));
1216 cfile.cinfo.fmt_matx[i] = (gboolean *) g_malloc0(sizeof(gboolean) *
1218 get_column_format_matches(cfile.cinfo.fmt_matx[i], cfile.cinfo.col_fmt[i]);
1219 cfile.cinfo.col_data[i] = NULL;
1220 if (cfile.cinfo.col_fmt[i] == COL_INFO)
1221 cfile.cinfo.col_buf[i] = (gchar *) g_malloc(sizeof(gchar) * COL_MAX_INFO_LEN);
1223 cfile.cinfo.col_buf[i] = (gchar *) g_malloc(sizeof(gchar) * COL_MAX_LEN);
1224 cfile.cinfo.col_fence[i] = 0;
1225 cfile.cinfo.col_expr[i] = (gchar *) g_malloc(sizeof(gchar) * COL_MAX_LEN);
1226 cfile.cinfo.col_expr_val[i] = (gchar *) g_malloc(sizeof(gchar) * COL_MAX_LEN);
1229 for (i = 0; i < cfile.cinfo.num_cols; i++) {
1232 for (j = 0; j < NUM_COL_FMTS; j++) {
1233 if (!cfile.cinfo.fmt_matx[i][j])
1236 if (cfile.cinfo.col_first[j] == -1)
1237 cfile.cinfo.col_first[j] = i;
1238 cfile.cinfo.col_last[j] = i;
1243 if (capture_opts.snaplen < 1)
1244 capture_opts.snaplen = WTAP_MAX_PACKET_SIZE;
1245 else if (capture_opts.snaplen < MIN_PACKET_SIZE)
1246 capture_opts.snaplen = MIN_PACKET_SIZE;
1248 /* Check the value range of the ring_num_files parameter */
1249 if (capture_opts.ring_num_files > RINGBUFFER_MAX_NUM_FILES)
1250 capture_opts.ring_num_files = RINGBUFFER_MAX_NUM_FILES;
1251 #if RINGBUFFER_MIN_NUM_FILES > 0
1252 else if (capture_opts.ring_num_files < RINGBUFFER_MIN_NUM_FILES)
1253 capture_opts.ring_num_files = RINGBUFFER_MIN_NUM_FILES;
1257 if (rfilter != NULL) {
1258 if (!dfilter_compile(rfilter, &rfcode)) {
1259 fprintf(stderr, "tethereal: %s\n", dfilter_error_msg);
1261 #ifdef HAVE_PCAP_OPEN_DEAD
1265 pc = pcap_open_dead(DLT_EN10MB, MIN_PACKET_SIZE);
1267 if (pcap_compile(pc, &fcode, rfilter, 0, 0) != -1) {
1269 " Note: That display filter code looks like a valid capture filter;\n"
1270 " maybe you mixed them up?\n");
1279 cfile.rfcode = rfcode;
1281 if (print_packet_info) {
1282 /* If we're printing as text or PostScript, we have
1283 to create a print stream. */
1284 if (output_action == WRITE_TEXT) {
1285 switch (print_format) {
1288 print_stream = print_stream_text_stdio_new(stdout);
1292 print_stream = print_stream_ps_stdio_new(stdout);
1296 g_assert_not_reached();
1301 /* We have to dissect each packet if:
1303 we're printing information about each packet;
1305 we're using a read filter on the packets;
1307 we're using any taps. */
1308 do_dissection = print_packet_info || rfcode || have_tap_listeners();
1312 * We're reading a capture file.
1317 * Immediately relinquish any set-UID or set-GID privileges we have;
1318 * we must not be allowed to read any capture files the user running
1319 * Tethereal can't open.
1325 if (cf_open(&cfile, cf_name, FALSE, &err) != CF_OK) {
1330 /* Set timestamp precision; there should arguably be a command-line
1331 option to let the user set this. */
1332 switch(wtap_file_tsprecision(cfile.wth)) {
1333 case(WTAP_FILE_TSPREC_SEC):
1334 timestamp_set_precision(TS_PREC_AUTO_SEC);
1336 case(WTAP_FILE_TSPREC_DSEC):
1337 timestamp_set_precision(TS_PREC_AUTO_DSEC);
1339 case(WTAP_FILE_TSPREC_CSEC):
1340 timestamp_set_precision(TS_PREC_AUTO_CSEC);
1342 case(WTAP_FILE_TSPREC_MSEC):
1343 timestamp_set_precision(TS_PREC_AUTO_MSEC);
1345 case(WTAP_FILE_TSPREC_USEC):
1346 timestamp_set_precision(TS_PREC_AUTO_USEC);
1348 case(WTAP_FILE_TSPREC_NSEC):
1349 timestamp_set_precision(TS_PREC_AUTO_NSEC);
1352 g_assert_not_reached();
1355 /* Process the packets in the file */
1356 err = load_cap_file(&cfile, save_file, out_file_type);
1363 /* No capture file specified, so we're supposed to do a live capture
1364 (or get a list of link-layer types for a live capture device);
1365 do we have support for live captures? */
1372 fprintf(stderr, "tethereal: WinPcap couldn't be found.\n");
1373 detailed_err = cant_load_winpcap_err("Tethereal");
1374 fprintf(stderr, "%s\n", detailed_err);
1375 g_free(detailed_err);
1380 /* Yes; did the user specify an interface to use? */
1381 if (capture_opts.iface == NULL) {
1382 /* No - is a default specified in the preferences file? */
1383 if (prefs->capture_device != NULL) {
1385 if_text = strrchr(prefs->capture_device, ' ');
1386 if (if_text == NULL) {
1387 capture_opts.iface = g_strdup(prefs->capture_device);
1389 capture_opts.iface = g_strdup(if_text + 1); /* Skip over space */
1392 /* No - pick the first one from the list of interfaces. */
1393 if_list = get_interface_list(&err, err_str);
1394 if (if_list == NULL) {
1397 case CANT_GET_INTERFACE_LIST:
1398 cant_get_if_list_errstr = cant_get_if_list_error_message(err_str);
1399 fprintf(stderr, "tethereal: %s\n", cant_get_if_list_errstr);
1400 g_free(cant_get_if_list_errstr);
1403 case NO_INTERFACES_FOUND:
1404 fprintf(stderr, "tethereal: There are no interfaces on which a capture can be done\n");
1409 if_info = if_list->data; /* first interface */
1410 capture_opts.iface = g_strdup(if_info->name);
1411 free_interface_list(if_list);
1415 if (list_link_layer_types) {
1416 /* We were asked to list the link-layer types for an interface.
1417 Get the list of link-layer types for the capture device. */
1418 lt_list = get_pcap_linktype_list(capture_opts.iface, err_str);
1419 if (lt_list == NULL) {
1420 if (err_str[0] != '\0') {
1421 fprintf(stderr, "tethereal: The list of data link types for the capture device could not be obtained (%s).\n"
1422 "Please check to make sure you have sufficient permissions, and that\n"
1423 "you have the proper interface or pipe specified.\n", err_str);
1425 fprintf(stderr, "tethereal: The capture device has no data link types.\n");
1428 fprintf(stderr, "Data link types (use option -y to set):\n");
1429 for (lt_entry = lt_list; lt_entry != NULL;
1430 lt_entry = g_list_next(lt_entry)) {
1431 data_link_info = lt_entry->data;
1432 fprintf(stderr, " %s", data_link_info->name);
1433 if (data_link_info->description != NULL)
1434 fprintf(stderr, " (%s)", data_link_info->description);
1436 fprintf(stderr, " (not supported)");
1439 free_pcap_linktype_list(lt_list);
1445 * The user didn't ask us not to print a count of packets as
1446 * they arrive, so do so.
1448 print_packet_counts = TRUE;
1451 /* For now, assume libpcap gives microsecond precision. */
1452 timestamp_set_precision(TS_PREC_AUTO_USEC);
1454 capture(save_file, out_file_type);
1456 if (capture_opts.multi_files_on) {
1460 /* No - complain. */
1461 fprintf(stderr, "This version of Tethereal was not built with support for capturing packets.\n");
1466 draw_tap_listeners(TRUE);
1473 /* Do the low-level work of a capture.
1474 Returns TRUE if it succeeds, FALSE otherwise. */
1476 static condition *volatile cnd_ring_timeout = NULL; /* this must be visible in process_packet */
1479 capture(char *save_file, int out_file_type)
1483 gchar open_err_str[PCAP_ERRBUF_SIZE];
1484 gchar lookup_net_err_str[PCAP_ERRBUF_SIZE];
1485 bpf_u_int32 netnum, netmask;
1486 struct bpf_program fcode;
1487 const char *set_linktype_err_str;
1489 int volatile volatile_err = 0;
1490 int volatile inpkts = 0;
1492 char errmsg[1024+1];
1493 condition *volatile cnd_stop_capturesize = NULL;
1494 condition *volatile cnd_stop_timeout = NULL;
1497 void (*oldhandler)(int);
1498 static const char ppamsg[] = "can't find PPA for ";
1499 const char *libpcap_warn;
1500 volatile int pipe_fd = -1;
1501 struct pcap_hdr hdr;
1502 struct pcaprec_modified_hdr rechdr;
1503 guchar pcap_data[WTAP_MAX_PACKET_SIZE];
1505 struct pcap_stat stats;
1508 dfilter_t *rfcode = NULL;
1511 /* Initialize all data structures used for dissection. */
1514 ld.linktype = WTAP_ENCAP_UNKNOWN;
1517 /* Open the network interface to capture from it.
1518 Some versions of libpcap may put warnings into the error buffer
1519 if they succeed; to tell if that's happened, we have to clear
1520 the error buffer, and check if it's still a null string. */
1521 open_err_str[0] = '\0';
1522 ld.pch = pcap_open_live(capture_opts.iface, capture_opts.snaplen,
1523 capture_opts.promisc_mode, 1000, open_err_str);
1525 if (ld.pch != NULL) {
1526 /* setting the data link type only works on real interfaces */
1527 if (capture_opts.linktype != -1) {
1528 set_linktype_err_str = set_pcap_linktype(ld.pch, capture_opts.iface,
1529 capture_opts.linktype);
1530 if (set_linktype_err_str != NULL) {
1531 g_snprintf(errmsg, sizeof errmsg, "Unable to set data link type (%s).",
1532 set_linktype_err_str);
1537 /* We couldn't open "cfile.iface" as a network device. */
1539 /* On Windows, we don't support capturing on pipes, so we give up. */
1541 /* On Win32 OSes, the capture devices are probably available to all
1542 users; don't warn about permissions problems.
1544 Do, however, warn about the lack of 64-bit support, and warn that
1545 WAN devices aren't supported. */
1546 g_snprintf(errmsg, sizeof errmsg,
1547 "The capture session could not be initiated (%s).\n"
1548 "Please check that you have the proper interface specified.\n"
1550 "Help can be found at: http://wiki.ethereal.com/CaptureSetup\n"
1552 "WinPcap does not support 64-bit Windows, so you will not be able to capture\n"
1553 "traffic with Tethereal on 64-bit Windows. You will have to use some other\n"
1554 "tool to capture traffic, such as netcap; see\n"
1556 " http://support.microsoft.com/?id=310875\n"
1558 "for information about netcap.\n"
1560 "Note that version 3.0 of WinPcap, and earlier versions of WinPcap, don't\n"
1561 "support capturing on PPP/WAN interfaces on Windows NT 4.0 / 2000 / XP /\n"
1563 "WinPcap 3.1 has support for it on Windows 2000 / XP / Server 2003, but has no\n"
1564 "support for it on Windows NT 4.0 or Windows Vista (Beta 1).\n",
1568 /* try to open cfile.iface as a pipe */
1569 pipe_fd = pipe_open_live(capture_opts.iface, &hdr, &ld, errmsg,
1572 if (pipe_fd == -1) {
1574 if (ld.pipe_err == PIPNEXIST) {
1575 /* Pipe doesn't exist, so output message for interface */
1577 /* If we got a "can't find PPA for XXX" message, warn the user (who
1578 is running Tethereal on HP-UX) that they don't have a version
1579 of libpcap that properly handles HP-UX (libpcap 0.6.x and later
1580 versions, which properly handle HP-UX, say "can't find /dev/dlpi
1581 PPA for XXX" rather than "can't find PPA for XXX"). */
1582 if (strncmp(open_err_str, ppamsg, sizeof ppamsg - 1) == 0)
1585 "You are running Tethereal with a version of the libpcap library\n"
1586 "that doesn't handle HP-UX network devices well; this means that\n"
1587 "Tethereal may not be able to capture packets.\n"
1589 "To fix this, you should install libpcap 0.6.2, or a later version\n"
1590 "of libpcap, rather than libpcap 0.4 or 0.5.x. It is available in\n"
1591 "packaged binary form from the Software Porting And Archive Centre\n"
1592 "for HP-UX; the Centre is at http://hpux.connect.org.uk/ - the page\n"
1593 "at the URL lists a number of mirror sites.";
1596 g_snprintf(errmsg, sizeof errmsg,
1597 "The capture session could not be initiated (%s).\n"
1598 "Please check to make sure you have sufficient permissions, and that\n"
1599 "you have the proper interface or pipe specified.%s", open_err_str,
1603 * Else pipe (or file) does exist and pipe_open_live() has
1608 /* pipe_open_live() succeeded; don't want
1609 error message from pcap_open_live() */
1610 open_err_str[0] = '\0';
1616 * We've opened the capture device, so, if we're set-UID or set-GID,
1617 * relinquish those privileges.
1619 * XXX - if we have saved set-user-ID support, we should give up those
1620 * privileges immediately, and then reclaim them long enough to get
1621 * a list of network interfaces and to open one, and then give them
1622 * up again, so that stuff we do while processing the argument list,
1623 * reading the user's preferences, etc. is done as the real user and
1624 * group, not the effective user and group.
1630 if (capture_opts.cfilter && !ld.from_pipe) {
1631 /* A capture filter was specified; set it up. */
1632 if (pcap_lookupnet(capture_opts.iface, &netnum, &netmask, lookup_net_err_str) < 0) {
1634 * Well, we can't get the netmask for this interface; it's used
1635 * only for filters that check for broadcast IP addresses, so
1636 * we just warn the user, and punt and use 0.
1639 "Warning: Couldn't obtain netmask info (%s).\n", lookup_net_err_str);
1642 if (pcap_compile(ld.pch, &fcode, capture_opts.cfilter, 1, netmask) < 0) {
1643 if (dfilter_compile(capture_opts.cfilter, &rfcode)) {
1644 g_snprintf(errmsg, sizeof errmsg,
1645 "Unable to parse capture filter string (%s).\n"
1646 " Interestingly enough, this looks like a valid display filter\n"
1647 " Are you sure you didn't mix them up?",
1648 pcap_geterr(ld.pch));
1650 g_snprintf(errmsg, sizeof errmsg,
1651 "Unable to parse capture filter string (%s).",
1652 pcap_geterr(ld.pch));
1656 if (pcap_setfilter(ld.pch, &fcode) < 0) {
1657 g_snprintf(errmsg, sizeof errmsg, "Can't install filter (%s).",
1658 pcap_geterr(ld.pch));
1659 #ifdef HAVE_PCAP_FREECODE
1660 pcap_freecode(&fcode);
1664 #ifdef HAVE_PCAP_FREECODE
1665 pcap_freecode(&fcode);
1669 /* Set up to write to the capture file. */
1672 pcap_encap = hdr.network;
1673 file_snaplen = hdr.snaplen;
1677 pcap_encap = get_pcap_linktype(ld.pch, capture_opts.iface);
1678 file_snaplen = pcap_snapshot(ld.pch);
1680 ld.linktype = wtap_pcap_encap_to_wtap_encap(pcap_encap);
1681 if (save_file != NULL) {
1682 /* Set up to write to the capture file. */
1683 if (ld.linktype == WTAP_ENCAP_UNKNOWN) {
1684 strcpy(errmsg, "The network you're capturing from is of a type"
1685 " that Tethereal doesn't support.");
1688 ld.save_file = save_file;
1689 if (capture_opts.multi_files_on) {
1690 save_file_fd = ringbuf_init(save_file,
1691 capture_opts.ring_num_files);
1692 if (save_file_fd != -1) {
1693 ld.pdh = ringbuf_init_wtap_dump_fdopen(out_file_type, ld.linktype,
1694 file_snaplen, &err);
1696 err = errno; /* "ringbuf_init()" failed */
1700 ld.pdh = wtap_dump_open(save_file, out_file_type,
1701 ld.linktype, file_snaplen, FALSE /* compress */, &err);
1704 if (ld.pdh == NULL) {
1705 g_snprintf(errmsg, sizeof errmsg,
1706 cf_open_error_message(err, NULL, TRUE, out_file_type),
1707 *save_file == '\0' ? "stdout" : save_file);
1712 /* Does "open_err_str" contain a non-empty string? If so, "pcap_open_live()"
1713 returned a warning; print it, but keep capturing. */
1714 if (open_err_str[0] != '\0')
1715 fprintf(stderr, "tethereal: WARNING: %s.\n", open_err_str);
1718 /* Catch a CTRL+C event and, if we get it, clean up and exit. */
1719 SetConsoleCtrlHandler(capture_cleanup, TRUE);
1721 /* Catch SIGINT and SIGTERM and, if we get either of them, clean up
1723 XXX - deal with signal semantics on various UNIX platforms. Or just
1724 use "sigaction()" and be done with it? */
1725 signal(SIGTERM, capture_cleanup);
1726 signal(SIGINT, capture_cleanup);
1727 if ((oldhandler = signal(SIGHUP, capture_cleanup)) != SIG_DFL)
1728 signal(SIGHUP, oldhandler);
1731 /* Catch SIGINFO and, if we get it and we're capturing to a file in
1732 quiet mode, report the number of packets we've captured. */
1733 signal(SIGINFO, report_counts_siginfo);
1734 #endif /* SIGINFO */
1737 /* Let the user know what interface was chosen. */
1738 descr = get_interface_descriptive_name(capture_opts.iface);
1739 fprintf(stderr, "Capturing on %s\n", descr);
1742 /* initialize capture stop conditions */
1743 init_capture_stop_conditions();
1744 /* create stop conditions */
1745 if (capture_opts.has_autostop_filesize)
1746 cnd_stop_capturesize = cnd_new((const char*)CND_CLASS_CAPTURESIZE,
1747 (long)capture_opts.autostop_filesize * 1000);
1748 if (capture_opts.has_autostop_duration)
1749 cnd_stop_timeout = cnd_new((const char*)CND_CLASS_TIMEOUT,
1750 (gint32)capture_opts.autostop_duration);
1752 if (capture_opts.multi_files_on && capture_opts.has_file_duration)
1753 cnd_ring_timeout = cnd_new(CND_CLASS_TIMEOUT,
1754 capture_opts.file_duration);
1756 if (!setjmp(ld.stopenv)) {
1758 ld.packet_count = 0;
1762 /* We need to be careful with automatic variables defined in the
1763 outer scope which are changed inside the loop. Most compilers
1764 don't try to roll them back to their original values after the
1765 longjmp which causes the loop to finish, but all that the
1766 standards say is that their values are indeterminate. If we
1767 don't want them to be rolled back, we should define them with the
1768 volatile attribute (paraphrasing W. Richard Stevens, Advanced
1769 Programming in the UNIX Environment, p. 178).
1771 The "err" variable causes a particular problem. If we give it
1772 the volatile attribute, then when we pass a reference to it (as
1773 in "&err") to a function, GCC warns: "passing arg <n> of
1774 <function> discards qualifiers from pointer target type".
1775 Therefore within the loop and just beyond we don't use "err".
1776 Within the loop we define "loop_err", and assign its value to
1777 "volatile_err", which is in the outer scope and is checked when
1780 We also define "packet_count_prev" here to keep things tidy,
1781 since it's used only inside the loop. If it were defined in the
1782 outer scope, GCC would give a warning (unnecessary in this case)
1783 that it might be clobbered, and we'd need to give it the volatile
1784 attribute to suppress the warning. */
1787 int packet_count_prev = 0;
1789 if (cnd_stop_capturesize == NULL && cnd_stop_timeout == NULL) {
1790 /* We're not stopping at a particular capture file size, and we're
1791 not stopping after some particular amount of time has expired,
1792 so either we have no stop condition or the only stop condition
1793 is a maximum packet count.
1795 If there's no maximum packet count, pass it -1, meaning "until
1796 you run out of packets in the bufferful you read". Otherwise,
1797 pass it the number of packets we have left to capture.
1799 We don't call "pcap_loop()" as, if we're saving to a file that's
1800 a FIFO, we want to flush the FIFO after we're done processing
1801 this libpcap bufferful of packets, so that the program
1802 reading the FIFO sees the packets immediately and doesn't get
1803 any partial packet, forcing it to block in the middle of reading
1805 if (capture_opts.autostop_packets == 0)
1808 if (ld.packet_count >= capture_opts.autostop_packets) {
1809 /* XXX do we need this test here? */
1810 /* It appears there's nothing more to capture. */
1813 pcap_cnt = capture_opts.autostop_packets - ld.packet_count;
1816 /* We need to check the capture file size or the timeout after
1822 inpkts = pipe_dispatch(pipe_fd, &ld, &hdr, &rechdr, pcap_data,
1823 errmsg, sizeof errmsg);
1826 inpkts = pcap_dispatch(ld.pch, pcap_cnt, capture_pcap_cb, (u_char *) &ld);
1828 /* Error from "pcap_dispatch()", or error or "no more packets" from
1829 "pipe_dispatch(). */
1831 } else if (cnd_stop_timeout != NULL && cnd_eval(cnd_stop_timeout)) {
1832 /* The specified capture time has elapsed; stop the capture. */
1834 } else if (inpkts > 0) {
1835 if (capture_opts.autostop_packets != 0 &&
1836 ld.packet_count >= capture_opts.autostop_packets) {
1837 /* The specified number of packets have been captured and have
1838 passed both any capture filter in effect and any read filter
1841 } else if (cnd_stop_capturesize != NULL &&
1842 cnd_eval(cnd_stop_capturesize,
1843 (guint32)wtap_get_bytes_dumped(ld.pdh))) {
1844 /* We're saving the capture to a file, and the capture file reached
1845 its maximum size. */
1846 if (capture_opts.multi_files_on) {
1847 /* Switch to the next ringbuffer file */
1848 if (ringbuf_switch_file(&ld.pdh, &save_file, &save_file_fd, &loop_err)) {
1849 /* File switch succeeded: reset the condition */
1850 cnd_reset(cnd_stop_capturesize);
1851 if (cnd_ring_timeout) {
1852 cnd_reset(cnd_ring_timeout);
1855 /* File switch failed: stop here */
1856 volatile_err = loop_err;
1860 /* No ringbuffer - just stop. */
1864 if (ld.output_to_pipe) {
1865 if (ld.packet_count > packet_count_prev) {
1866 wtap_dump_flush(ld.pdh);
1867 packet_count_prev = ld.packet_count;
1871 } /* while (ld.go) */
1873 /* delete stop conditions */
1874 if (cnd_stop_capturesize != NULL)
1875 cnd_delete(cnd_stop_capturesize);
1876 if (cnd_stop_timeout != NULL)
1877 cnd_delete(cnd_stop_timeout);
1878 if (cnd_ring_timeout != NULL)
1879 cnd_delete(cnd_ring_timeout);
1881 if (print_packet_counts) {
1882 /* We're printing packet counts to stderr.
1883 Send a newline so that we move to the line after the packet count. */
1884 fprintf(stderr, "\n");
1887 /* If we got an error while capturing, report it. */
1891 if (ld.pipe_err == PIPERR) {
1892 fprintf(stderr, "tethereal: Error while capturing packets: %s\n",
1898 fprintf(stderr, "tethereal: Error while capturing packets: %s\n",
1899 pcap_geterr(ld.pch));
1903 if (volatile_err == 0)
1906 show_capture_file_io_error(save_file, volatile_err, FALSE);
1910 if (save_file != NULL) {
1911 /* We're saving to a file or files; close all files. */
1912 if (capture_opts.multi_files_on) {
1913 dump_ok = ringbuf_wtap_dump_close(&save_file, &err);
1915 dump_ok = wtap_dump_close(ld.pdh, &err);
1917 /* If we've displayed a message about a write error, there's no point
1918 in displaying another message about an error on close. */
1919 if (!dump_ok && !write_err)
1920 show_capture_file_io_error(save_file, err, TRUE);
1924 if (ld.from_pipe && pipe_fd >= 0)
1929 /* Get the capture statistics, and, if any packets were dropped, report
1931 if (pcap_stats(ld.pch, &stats) >= 0) {
1932 if (stats.ps_drop != 0) {
1933 fprintf(stderr, "%u packets dropped\n", stats.ps_drop);
1936 fprintf(stderr, "tethereal: Can't get packet-drop statistics: %s\n",
1937 pcap_geterr(ld.pch));
1942 /* Report the number of captured packets if not reported during capture
1943 and we are saving to a file. */
1949 if (capture_opts.multi_files_on) {
1950 ringbuf_error_cleanup();
1954 fprintf(stderr, "tethereal: %s\n", errmsg);
1970 capture_pcap_cb(u_char *user, const struct pcap_pkthdr *phdr,
1973 struct wtap_pkthdr whdr;
1974 union wtap_pseudo_header pseudo_header;
1975 loop_data *ldat = (loop_data *) user;
1980 /* Convert from libpcap to Wiretap format.
1981 If that fails, ignore the packet (wtap_process_pcap_packet has
1982 written an error message). */
1983 pd = wtap_process_pcap_packet(ldat->linktype, phdr, pd, &pseudo_header,
1990 * Prevent a SIGINFO handler from writing to stdout while we're
1991 * doing so; instead, have it just set a flag telling us to print
1992 * that information when we're done.
1995 #endif /* SIGINFO */
1997 /* The current packet may have arrived after a very long silence,
1998 * way past the time to switch files. In order not to have
1999 * the first packet of a new series of events as the last
2000 * [or only] packet in the file, switch before writing!
2002 if (cnd_ring_timeout != NULL && cnd_eval(cnd_ring_timeout)) {
2003 /* time elapsed for this ring file, switch to the next */
2004 if (ringbuf_switch_file(&ldat->pdh, &ldat->save_file, &save_file_fd, &loop_err)) {
2005 /* File switch succeeded: reset the condition */
2006 cnd_reset(cnd_ring_timeout);
2008 /* File switch failed: stop here */
2009 /* XXX - we should do something with "loop_err" */
2014 if (!process_packet(&cfile, ldat->pdh, 0, &whdr, &pseudo_header, pd, &err)) {
2015 /* Error writing to a capture file */
2016 if (print_packet_counts) {
2017 /* We're printing counts of packets captured; move to the line after
2019 fprintf(stderr, "\n");
2021 show_capture_file_io_error(ldat->save_file, err, FALSE);
2022 pcap_close(ldat->pch);
2023 wtap_dump_close(ldat->pdh, &err);
2029 * Allow SIGINFO handlers to write.
2034 * If a SIGINFO handler asked us to write out capture counts, do so.
2038 #endif /* SIGINFO */
2043 capture_cleanup(DWORD ctrltype _U_)
2045 /* CTRL_C_EVENT is sort of like SIGINT, CTRL_BREAK_EVENT is unique to
2046 Windows, CTRL_CLOSE_EVENT is sort of like SIGHUP, CTRL_LOGOFF_EVENT
2047 is also sort of like SIGHUP, and CTRL_SHUTDOWN_EVENT is sort of
2048 like SIGTERM at least when the machine's shutting down.
2050 For now, we handle them all as indications that we should clean up
2051 and quit, just as we handle SIGINT, SIGHUP, and SIGTERM in that
2054 However, as handlers run in a new thread, we can't just longjmp
2055 out; we have to set "ld.go" to FALSE, and must return TRUE so that
2056 no other handler - such as one that would terminate the process -
2059 XXX - for some reason, typing ^C to Tethereal, if you run this in
2060 a Cygwin console window in at least some versions of Cygwin,
2061 causes Tethereal to terminate immediately; this routine gets
2062 called, but the main loop doesn't get a chance to run and
2063 exit cleanly, at least if this is compiled with Microsoft Visual
2064 C++ (i.e., it's a property of the Cygwin console window or Bash;
2065 it happens if Tethereal is not built with Cygwin - for all I know,
2066 building it with Cygwin may make the problem go away). */
2072 capture_cleanup(int signum _U_)
2074 /* Longjmp back to the starting point; "pcap_dispatch()", on many
2075 UNIX platforms, just keeps looping if it gets EINTR, so if we set
2076 "ld.go" to FALSE and return, we won't break out of it and quit
2078 longjmp(ld.stopenv, 1);
2086 /* XXX - if we use sigaction, this doesn't have to be done.
2087 (Yes, this isn't necessary on BSD, but just in case a system
2088 where "signal()" has AT&T semantics adopts SIGINFO....) */
2089 signal(SIGINFO, report_counts_siginfo);
2090 #endif /* SIGINFO */
2092 if (!print_packet_counts) {
2093 /* Report the count only if we aren't printing a packet count
2094 as packets arrive. */
2095 fprintf(stderr, "%u packets captured\n", ld.packet_count);
2098 infoprint = FALSE; /* we just reported it */
2099 #endif /* SIGINFO */
2104 report_counts_siginfo(int signum _U_)
2106 int sav_errno = errno;
2107 /* If we've been told to delay printing, just set a flag asking
2108 that we print counts (if we're supposed to), otherwise print
2109 the count of packets captured (if we're supposed to). */
2116 #endif /* SIGINFO */
2117 #endif /* HAVE_LIBPCAP */
2120 load_cap_file(capture_file *cf, char *save_file, int out_file_type)
2123 int snapshot_length;
2129 linktype = wtap_file_encap(cf->wth);
2130 if (save_file != NULL) {
2131 /* Set up to write to the capture file. */
2132 snapshot_length = wtap_snapshot_length(cf->wth);
2133 if (snapshot_length == 0) {
2134 /* Snapshot length of input file not known. */
2135 snapshot_length = WTAP_MAX_PACKET_SIZE;
2137 pdh = wtap_dump_open(save_file, out_file_type,
2138 linktype, snapshot_length, FALSE /* compressed */, &err);
2141 /* We couldn't set up to write to the capture file. */
2144 case WTAP_ERR_UNSUPPORTED_FILE_TYPE:
2146 "tethereal: Capture files can't be written in that format.\n");
2149 case WTAP_ERR_UNSUPPORTED_ENCAP:
2150 case WTAP_ERR_ENCAP_PER_PACKET_UNSUPPORTED:
2152 "tethereal: The capture file being read can't be written in "
2156 case WTAP_ERR_CANT_OPEN:
2158 "tethereal: The file \"%s\" couldn't be created for some "
2159 "unknown reason.\n",
2160 *save_file == '\0' ? "stdout" : save_file);
2163 case WTAP_ERR_SHORT_WRITE:
2165 "tethereal: A full header couldn't be written to the file \"%s\".\n",
2166 *save_file == '\0' ? "stdout" : save_file);
2171 "tethereal: The file \"%s\" could not be created: %s\n.",
2172 *save_file == '\0' ? "stdout" : save_file,
2173 wtap_strerror(err));
2179 if (print_packet_info) {
2180 if (!write_preamble(cf)) {
2182 show_print_file_io_error(err);
2188 while (wtap_read(cf->wth, &err, &err_info, &data_offset)) {
2189 if (!process_packet(cf, pdh, data_offset, wtap_phdr(cf->wth),
2190 wtap_pseudoheader(cf->wth), wtap_buf_ptr(cf->wth),
2192 /* Error writing to a capture file */
2193 show_capture_file_io_error(save_file, err, FALSE);
2194 wtap_dump_close(pdh, &err);
2199 /* Print a message noting that the read failed somewhere along the line. */
2202 case WTAP_ERR_UNSUPPORTED_ENCAP:
2204 "tethereal: \"%s\" has a packet with a network type that Tethereal doesn't support.\n(%s)\n",
2205 cf->filename, err_info);
2208 case WTAP_ERR_CANT_READ:
2210 "tethereal: An attempt to read from \"%s\" failed for some unknown reason.\n",
2214 case WTAP_ERR_SHORT_READ:
2216 "tethereal: \"%s\" appears to have been cut short in the middle of a packet.\n",
2220 case WTAP_ERR_BAD_RECORD:
2222 "tethereal: \"%s\" appears to be damaged or corrupt.\n(%s)\n",
2223 cf->filename, err_info);
2228 "tethereal: An error occurred while reading \"%s\": %s.\n",
2229 cf->filename, wtap_strerror(err));
2232 if (save_file != NULL) {
2233 /* Now close the capture file. */
2234 if (!wtap_dump_close(pdh, &err))
2235 show_capture_file_io_error(save_file, err, TRUE);
2238 if (save_file != NULL) {
2239 /* Now close the capture file. */
2240 if (!wtap_dump_close(pdh, &err))
2241 show_capture_file_io_error(save_file, err, TRUE);
2243 if (print_packet_info) {
2244 if (!write_finale()) {
2246 show_print_file_io_error(err);
2253 wtap_close(cf->wth);
2260 fill_in_fdata(frame_data *fdata, capture_file *cf,
2261 const struct wtap_pkthdr *phdr, long offset)
2266 fdata->num = cf->count;
2267 fdata->pkt_len = phdr->len;
2268 cum_bytes += phdr->len;
2269 fdata->cum_bytes = cum_bytes;
2270 fdata->cap_len = phdr->caplen;
2271 fdata->file_off = offset;
2272 fdata->lnk_t = phdr->pkt_encap;
2273 fdata->abs_ts = *((nstime_t *) &phdr->ts);
2274 fdata->flags.passed_dfilter = 0;
2275 fdata->flags.encoding = CHAR_ASCII;
2276 fdata->flags.visited = 0;
2277 fdata->flags.marked = 0;
2278 fdata->flags.ref_time = 0;
2280 /* If we don't have the time stamp of the first packet in the
2281 capture, it's because this is the first packet. Save the time
2282 stamp of this packet as the time stamp of the first packet. */
2283 if (nstime_is_zero(&first_ts)) {
2284 first_ts = fdata->abs_ts;
2287 /* If we don't have the time stamp of the previous displayed packet,
2288 it's because this is the first displayed packet. Save the time
2289 stamp of this packet as the time stamp of the previous displayed
2291 if (nstime_is_zero(&prev_ts)) {
2292 prev_ts = fdata->abs_ts;
2295 /* Get the time elapsed between the first packet and this packet. */
2296 nstime_delta(&fdata->rel_ts, &fdata->abs_ts, &first_ts);
2298 /* If it's greater than the current elapsed time, set the elapsed time
2299 to it (we check for "greater than" so as not to be confused by
2300 time moving backwards). */
2301 if ((gint32)cf->elapsed_time.secs < fdata->rel_ts.secs
2302 || ((gint32)cf->elapsed_time.secs == fdata->rel_ts.secs && (gint32)cf->elapsed_time.nsecs < fdata->rel_ts.nsecs)) {
2303 cf->elapsed_time = fdata->rel_ts;
2306 /* Get the time elapsed between the previous displayed packet and
2308 nstime_delta(&fdata->del_ts, &fdata->abs_ts, &prev_ts);
2309 prev_ts = fdata->abs_ts;
2312 /* Free up all data attached to a "frame_data" structure. */
2314 clear_fdata(frame_data *fdata)
2317 g_slist_free(fdata->pfd);
2321 process_packet(capture_file *cf, wtap_dumper *pdh, long offset,
2322 const struct wtap_pkthdr *whdr,
2323 union wtap_pseudo_header *pseudo_header, const guchar *pd,
2327 gboolean create_proto_tree;
2328 epan_dissect_t *edt;
2331 /* Count this packet. */
2334 /* If we're going to print packet information, or we're going to
2335 run a read filter, or we're going to process taps, set up to
2336 do a dissection and do so. */
2337 if (do_dissection) {
2338 fill_in_fdata(&fdata, cf, whdr, offset);
2340 if (print_packet_info) {
2341 /* Grab any resolved addresses */
2343 if (g_resolv_flags) {
2344 host_name_lookup_process(NULL);
2349 if (cf->rfcode || verbose || num_tap_filters!=0)
2350 create_proto_tree = TRUE;
2352 create_proto_tree = FALSE;
2353 /* The protocol tree will be "visible", i.e., printed, only if we're
2354 printing packet details, which is true if we're printing stuff
2355 ("print_packet_info" is true) and we're in verbose mode ("verbose"
2357 edt = epan_dissect_new(create_proto_tree, print_packet_info && verbose);
2359 /* If we're running a read filter, prime the epan_dissect_t with that
2362 epan_dissect_prime_dfilter(edt, cf->rfcode);
2364 tap_queue_init(edt);
2366 /* We only need the columns if we're printing packet info but we're
2367 *not* verbose; in verbose mode, we print the protocol tree, not
2368 the protocol summary. */
2369 epan_dissect_run(edt, pseudo_header, pd, &fdata,
2370 (print_packet_info && !verbose) ? &cf->cinfo : NULL);
2372 tap_push_tapped_queue(edt);
2374 /* Run the read filter if we have one. */
2376 passed = dfilter_apply_edt(cf->rfcode, edt);
2380 /* We're not running a display filter and we're not printing any
2381 packet information, so we don't need to do a dissection, and all
2382 packets are processed. */
2388 /* Count this packet. */
2393 /* Process this packet. */
2395 /* We're writing to a capture file; write this packet. */
2396 if (!wtap_dump(pdh, whdr, pseudo_header, pd, err))
2399 if (print_packet_counts) {
2400 /* We're printing packet counts. */
2401 if (ld.packet_count != 0) {
2402 fprintf(stderr, "\r%u ", ld.packet_count);
2403 /* stderr could be line buffered */
2409 if (print_packet_info) {
2410 /* We're printing packet information; print the information for
2412 print_packet(cf, edt);
2414 /* The ANSI C standard does not appear to *require* that a line-buffered
2415 stream be flushed to the host environment whenever a newline is
2416 written, it just says that, on such a stream, characters "are
2417 intended to be transmitted to or from the host environment as a
2418 block when a new-line character is encountered".
2420 The Visual C++ 6.0 C implementation doesn't do what is intended;
2421 even if you set a stream to be line-buffered, it still doesn't
2422 flush the buffer at the end of every line.
2424 So, if the "-l" flag was specified, we flush the standard output
2425 at the end of a packet. This will do the right thing if we're
2426 printing packet summary lines, and, as we print the entire protocol
2427 tree for a single packet without waiting for anything to happen,
2428 it should be as good as line-buffered mode if we're printing
2429 protocol trees. (The whole reason for the "-l" flag in either
2430 tcpdump or Tethereal is to allow the output of a live capture to
2431 be piped to a program or script and to have that script see the
2432 information for the packet as soon as it's printed, rather than
2433 having to wait until a standard I/O buffer fills up. */
2437 if (ferror(stdout)) {
2438 show_print_file_io_error(errno);
2444 if (do_dissection) {
2445 epan_dissect_free(edt);
2446 clear_fdata(&fdata);
2452 show_capture_file_io_error(const char *fname, int err, gboolean is_close)
2461 "tethereal: Not all the packets could be written to \"%s\" because there is "
2462 "no space left on the file system.\n",
2469 "tethereal: Not all the packets could be written to \"%s\" because you are "
2470 "too close to, or over your disk quota.\n",
2475 case WTAP_ERR_CANT_CLOSE:
2477 "tethereal: \"%s\" couldn't be closed for some unknown reason.\n",
2481 case WTAP_ERR_SHORT_WRITE:
2483 "tethereal: Not all the packets could be written to \"%s\".\n",
2490 "tethereal: \"%s\" could not be closed: %s.\n",
2491 fname, wtap_strerror(err));
2494 "tethereal: An error occurred while writing to \"%s\": %s.\n",
2495 fname, wtap_strerror(err));
2502 write_preamble(capture_file *cf)
2504 switch (output_action) {
2507 return print_preamble(print_stream, cf->filename);
2512 write_pdml_preamble(stdout);
2514 write_psml_preamble(stdout);
2515 return !ferror(stdout);
2518 g_assert_not_reached();
2524 get_line_buf(size_t len)
2526 static char *line_bufp = NULL;
2527 static size_t line_buf_len = 256;
2528 size_t new_line_buf_len;
2530 for (new_line_buf_len = line_buf_len; len > new_line_buf_len;
2531 new_line_buf_len *= 2)
2533 if (line_bufp == NULL) {
2534 line_buf_len = new_line_buf_len;
2535 line_bufp = g_malloc(line_buf_len + 1);
2537 if (new_line_buf_len > line_buf_len) {
2538 line_buf_len = new_line_buf_len;
2539 line_bufp = g_realloc(line_bufp, line_buf_len + 1);
2546 print_columns(capture_file *cf)
2553 line_bufp = get_line_buf(256);
2556 for (i = 0; i < cf->cinfo.num_cols; i++) {
2557 switch (cf->cinfo.col_fmt[i]) {
2561 * Don't print this if we're doing a live capture from a network
2562 * interface - if we're doing a live capture, you won't be
2563 * able to look at the capture in the future (it's not being
2564 * saved anywhere), so the frame numbers are unlikely to be
2567 * (XXX - it might be nice to be able to save and print at
2568 * the same time, sort of like an "Update list of packets
2569 * in real time" capture in Ethereal.)
2571 if (capture_opts.iface != NULL)
2574 column_len = strlen(cf->cinfo.col_data[i]);
2577 line_bufp = get_line_buf(buf_offset + column_len);
2578 sprintf(line_bufp + buf_offset, "%3s", cf->cinfo.col_data[i]);
2584 case COL_ABS_DATE_TIME: /* XXX - wider */
2585 column_len = strlen(cf->cinfo.col_data[i]);
2586 if (column_len < 10)
2588 line_bufp = get_line_buf(buf_offset + column_len);
2589 sprintf(line_bufp + buf_offset, "%10s", cf->cinfo.col_data[i]);
2595 case COL_DEF_DL_SRC:
2596 case COL_RES_DL_SRC:
2597 case COL_UNRES_DL_SRC:
2598 case COL_DEF_NET_SRC:
2599 case COL_RES_NET_SRC:
2600 case COL_UNRES_NET_SRC:
2601 column_len = strlen(cf->cinfo.col_data[i]);
2602 if (column_len < 12)
2604 line_bufp = get_line_buf(buf_offset + column_len);
2605 sprintf(line_bufp + buf_offset, "%12s", cf->cinfo.col_data[i]);
2611 case COL_DEF_DL_DST:
2612 case COL_RES_DL_DST:
2613 case COL_UNRES_DL_DST:
2614 case COL_DEF_NET_DST:
2615 case COL_RES_NET_DST:
2616 case COL_UNRES_NET_DST:
2617 column_len = strlen(cf->cinfo.col_data[i]);
2618 if (column_len < 12)
2620 line_bufp = get_line_buf(buf_offset + column_len);
2621 sprintf(line_bufp + buf_offset, "%-12s", cf->cinfo.col_data[i]);
2625 column_len = strlen(cf->cinfo.col_data[i]);
2626 line_bufp = get_line_buf(buf_offset + column_len);
2627 strcat(line_bufp + buf_offset, cf->cinfo.col_data[i]);
2630 buf_offset += column_len;
2631 if (i != cf->cinfo.num_cols - 1) {
2633 * This isn't the last column, so we need to print a
2634 * separator between this column and the next.
2636 * If we printed a network source and are printing a
2637 * network destination of the same type next, separate
2638 * them with "->"; if we printed a network destination
2639 * and are printing a network source of the same type
2640 * next, separate them with "<-"; otherwise separate them
2643 * We add enough space to the buffer for " <- " or " -> ",
2644 * even if we're only adding " ".
2646 line_bufp = get_line_buf(buf_offset + 4);
2647 switch (cf->cinfo.col_fmt[i]) {
2652 switch (cf->cinfo.col_fmt[i + 1]) {
2657 strcat(line_bufp + buf_offset, " -> ");
2662 strcat(line_bufp + buf_offset, " ");
2668 case COL_DEF_DL_SRC:
2669 case COL_RES_DL_SRC:
2670 case COL_UNRES_DL_SRC:
2671 switch (cf->cinfo.col_fmt[i + 1]) {
2673 case COL_DEF_DL_DST:
2674 case COL_RES_DL_DST:
2675 case COL_UNRES_DL_DST:
2676 strcat(line_bufp + buf_offset, " -> ");
2681 strcat(line_bufp + buf_offset, " ");
2687 case COL_DEF_NET_SRC:
2688 case COL_RES_NET_SRC:
2689 case COL_UNRES_NET_SRC:
2690 switch (cf->cinfo.col_fmt[i + 1]) {
2692 case COL_DEF_NET_DST:
2693 case COL_RES_NET_DST:
2694 case COL_UNRES_NET_DST:
2695 strcat(line_bufp + buf_offset, " -> ");
2700 strcat(line_bufp + buf_offset, " ");
2709 switch (cf->cinfo.col_fmt[i + 1]) {
2714 strcat(line_bufp + buf_offset, " <- ");
2719 strcat(line_bufp + buf_offset, " ");
2725 case COL_DEF_DL_DST:
2726 case COL_RES_DL_DST:
2727 case COL_UNRES_DL_DST:
2728 switch (cf->cinfo.col_fmt[i + 1]) {
2730 case COL_DEF_DL_SRC:
2731 case COL_RES_DL_SRC:
2732 case COL_UNRES_DL_SRC:
2733 strcat(line_bufp + buf_offset, " <- ");
2738 strcat(line_bufp + buf_offset, " ");
2744 case COL_DEF_NET_DST:
2745 case COL_RES_NET_DST:
2746 case COL_UNRES_NET_DST:
2747 switch (cf->cinfo.col_fmt[i + 1]) {
2749 case COL_DEF_NET_SRC:
2750 case COL_RES_NET_SRC:
2751 case COL_UNRES_NET_SRC:
2752 strcat(line_bufp + buf_offset, " <- ");
2757 strcat(line_bufp + buf_offset, " ");
2764 strcat(line_bufp + buf_offset, " ");
2770 return print_line(print_stream, 0, line_bufp);
2774 print_packet(capture_file *cf, epan_dissect_t *edt)
2776 print_args_t print_args;
2779 /* Print the information in the protocol tree. */
2780 switch (output_action) {
2783 print_args.to_file = TRUE;
2784 print_args.format = print_format;
2785 print_args.print_summary = !verbose;
2786 print_args.print_hex = verbose && print_hex;
2787 print_args.print_formfeed = FALSE;
2788 print_args.print_dissections = verbose ? print_dissections_expanded : print_dissections_none;
2790 /* init the packet range */
2791 packet_range_init(&print_args.range);
2793 if (!proto_tree_print(&print_args, edt, print_stream))
2796 /* "print_hex_data()" will put out a leading blank line, as well
2797 as a trailing one; print one here, to separate the packets,
2798 only if "print_hex_data()" won't be called. */
2799 if (!print_line(print_stream, 0, ""))
2805 proto_tree_write_pdml(edt, stdout);
2807 return !ferror(stdout);
2810 /* Just fill in the columns. */
2811 epan_dissect_fill_in_columns(edt);
2813 /* Now print them. */
2814 switch (output_action) {
2817 if (!print_columns(cf))
2822 proto_tree_write_psml(edt, stdout);
2823 return !ferror(stdout);
2827 if (!print_hex_data(print_stream, edt))
2829 if (!print_line(print_stream, 0, ""))
2838 switch (output_action) {
2841 return print_finale(print_stream);
2846 write_pdml_finale(stdout);
2848 write_psml_finale(stdout);
2849 return !ferror(stdout);
2852 g_assert_not_reached();
2858 show_print_file_io_error(int err)
2864 "tethereal: Not all the packets could be printed because there is "
2865 "no space left on the file system.\n");
2871 "tethereal: Not all the packets could be printed because you are "
2872 "too close to, or over your disk quota.\n");
2878 "tethereal: An error occurred while printing packets: %s.\n",
2885 cf_open_error_message(int err, gchar *err_info, gboolean for_writing,
2889 static char errmsg_errno[1024+1];
2892 /* Wiretap error. */
2895 case WTAP_ERR_NOT_REGULAR_FILE:
2896 errmsg = "The file \"%s\" is a \"special file\" or socket or other non-regular file.";
2899 case WTAP_ERR_FILE_UNKNOWN_FORMAT:
2900 /* Seen only when opening a capture file for reading. */
2901 errmsg = "The file \"%s\" isn't a capture file in a format Tethereal understands.";
2904 case WTAP_ERR_UNSUPPORTED:
2905 /* Seen only when opening a capture file for reading. */
2906 g_snprintf(errmsg_errno, sizeof(errmsg_errno),
2907 "The file \"%%s\" isn't a capture file in a format Tethereal understands.\n"
2910 errmsg = errmsg_errno;
2913 case WTAP_ERR_CANT_WRITE_TO_PIPE:
2914 /* Seen only when opening a capture file for writing. */
2915 g_snprintf(errmsg_errno, sizeof(errmsg_errno),
2916 "The file \"%%s\" is a pipe, and %s capture files can't be "
2917 "written to a pipe.", wtap_file_type_string(file_type));
2918 errmsg = errmsg_errno;
2921 case WTAP_ERR_UNSUPPORTED_FILE_TYPE:
2922 /* Seen only when opening a capture file for writing. */
2923 errmsg = "Tethereal doesn't support writing capture files in that format.";
2926 case WTAP_ERR_UNSUPPORTED_ENCAP:
2928 errmsg = "Tethereal can't save this capture in that format.";
2930 g_snprintf(errmsg_errno, sizeof(errmsg_errno),
2931 "The file \"%%s\" is a capture for a network type that Tethereal doesn't support.\n"
2934 errmsg = errmsg_errno;
2938 case WTAP_ERR_ENCAP_PER_PACKET_UNSUPPORTED:
2940 errmsg = "Tethereal can't save this capture in that format.";
2942 errmsg = "The file \"%s\" is a capture for a network type that Tethereal doesn't support.";
2945 case WTAP_ERR_BAD_RECORD:
2946 /* Seen only when opening a capture file for reading. */
2947 g_snprintf(errmsg_errno, sizeof(errmsg_errno),
2948 "The file \"%%s\" appears to be damaged or corrupt.\n"
2951 errmsg = errmsg_errno;
2954 case WTAP_ERR_CANT_OPEN:
2956 errmsg = "The file \"%s\" could not be created for some unknown reason.";
2958 errmsg = "The file \"%s\" could not be opened for some unknown reason.";
2961 case WTAP_ERR_SHORT_READ:
2962 errmsg = "The file \"%s\" appears to have been cut short"
2963 " in the middle of a packet or other data.";
2966 case WTAP_ERR_SHORT_WRITE:
2967 errmsg = "A full header couldn't be written to the file \"%s\".";
2971 g_snprintf(errmsg_errno, sizeof(errmsg_errno),
2972 "The file \"%%s\" could not be %s: %s.",
2973 for_writing ? "created" : "opened",
2974 wtap_strerror(err));
2975 errmsg = errmsg_errno;
2979 errmsg = file_open_error_message(err, for_writing);
2984 * Open/create errors are reported with an console message in Tethereal.
2987 open_failure_message(const char *filename, int err, gboolean for_writing)
2989 fprintf(stderr, "tethereal: ");
2990 fprintf(stderr, file_open_error_message(err, for_writing), filename);
2991 fprintf(stderr, "\n");
2995 cf_open(capture_file *cf, const char *fname, gboolean is_tempfile, int *err)
2999 char err_msg[2048+1];
3001 wth = wtap_open_offline(fname, err, &err_info, FALSE);
3005 /* The open succeeded. Fill in the information for this file. */
3007 /* Initialize all data structures used for dissection. */
3011 cf->f_datalen = 0; /* not used, but set it anyway */
3013 /* Set the file name because we need it to set the follow stream filter.
3014 XXX - is that still true? We need it for other reasons, though,
3016 cf->filename = g_strdup(fname);
3018 /* Indicate whether it's a permanent or temporary file. */
3019 cf->is_tempfile = is_tempfile;
3021 /* If it's a temporary capture buffer file, mark it as not saved. */
3022 cf->user_saved = !is_tempfile;
3024 cf->cd_t = wtap_file_type(cf->wth);
3026 cf->drops_known = FALSE;
3028 cf->snap = wtap_snapshot_length(cf->wth);
3029 if (cf->snap == 0) {
3030 /* Snapshot length not known. */
3031 cf->has_snap = FALSE;
3032 cf->snap = WTAP_MAX_PACKET_SIZE;
3034 cf->has_snap = TRUE;
3035 nstime_set_zero(&cf->elapsed_time);
3036 nstime_set_zero(&first_ts);
3037 nstime_set_zero(&prev_ts);
3042 g_snprintf(err_msg, sizeof err_msg,
3043 cf_open_error_message(*err, err_info, FALSE, 0), fname);
3044 fprintf(stderr, "tethereal: %s\n", err_msg);
3050 /* Take care of byte order in the libpcap headers read from pipes.
3051 * (function taken from wiretap/libpcap.c) */
3053 adjust_header(loop_data *ldat, struct pcap_hdr *hdr, struct pcaprec_hdr *rechdr)
3055 if (ldat->byte_swapped) {
3056 /* Byte-swap the record header fields. */
3057 rechdr->ts_sec = BSWAP32(rechdr->ts_sec);
3058 rechdr->ts_usec = BSWAP32(rechdr->ts_usec);
3059 rechdr->incl_len = BSWAP32(rechdr->incl_len);
3060 rechdr->orig_len = BSWAP32(rechdr->orig_len);
3063 /* In file format version 2.3, the "incl_len" and "orig_len" fields were
3064 swapped, in order to match the BPF header layout.
3066 Unfortunately, some files were, according to a comment in the "libpcap"
3067 source, written with version 2.3 in their headers but without the
3068 interchanged fields, so if "incl_len" is greater than "orig_len" - which
3069 would make no sense - we assume that we need to swap them. */
3070 if (hdr->version_major == 2 &&
3071 (hdr->version_minor < 3 ||
3072 (hdr->version_minor == 3 && rechdr->incl_len > rechdr->orig_len))) {
3075 temp = rechdr->orig_len;
3076 rechdr->orig_len = rechdr->incl_len;
3077 rechdr->incl_len = temp;
3081 /* Mimic pcap_open_live() for pipe captures
3082 * We check if "pipename" is "-" (stdin) or a FIFO, open it, and read the
3084 * N.B. : we can't read the libpcap formats used in RedHat 6.1 or SuSE 6.3
3085 * because we can't seek on pipes (see wiretap/libpcap.c for details) */
3087 pipe_open_live(char *pipename, struct pcap_hdr *hdr, loop_data *ldat,
3088 char *errmsg, int errmsgl)
3090 struct stat pipe_stat;
3094 unsigned int bytes_read;
3097 * XXX Tethereal blocks until we return
3099 if (strcmp(pipename, "-") == 0)
3100 fd = 0; /* read from stdin */
3102 if (stat(pipename, &pipe_stat) < 0) {
3103 if (errno == ENOENT || errno == ENOTDIR)
3104 ldat->pipe_err = PIPNEXIST;
3106 g_snprintf(errmsg, errmsgl,
3107 "The capture session could not be initiated "
3108 "due to error on pipe: %s", strerror(errno));
3109 ldat->pipe_err = PIPERR;
3113 if (! S_ISFIFO(pipe_stat.st_mode)) {
3114 if (S_ISCHR(pipe_stat.st_mode)) {
3116 * Assume the user specified an interface on a system where
3117 * interfaces are in /dev. Pretend we haven't seen it.
3119 ldat->pipe_err = PIPNEXIST;
3121 g_snprintf(errmsg, errmsgl,
3122 "The capture session could not be initiated because\n"
3123 "\"%s\" is neither an interface nor a pipe", pipename);
3124 ldat->pipe_err = PIPERR;
3128 fd = open(pipename, O_RDONLY);
3130 g_snprintf(errmsg, errmsgl,
3131 "The capture session could not be initiated "
3132 "due to error on pipe open: %s", strerror(errno));
3133 ldat->pipe_err = PIPERR;
3138 ldat->from_pipe = TRUE;
3140 /* read the pcap header */
3142 while (bytes_read < sizeof magic) {
3143 b = read(fd, ((char *)&magic)+bytes_read, sizeof magic-bytes_read);
3146 g_snprintf(errmsg, errmsgl, "End of file on pipe during open");
3148 g_snprintf(errmsg, errmsgl, "Error on pipe during open: %s",
3157 /* Host that wrote it has our byte order, and was running
3158 a program using either standard or ss990417 libpcap. */
3159 ldat->byte_swapped = FALSE;
3160 ldat->modified = FALSE;
3162 case PCAP_MODIFIED_MAGIC:
3163 /* Host that wrote it has our byte order, but was running
3164 a program using either ss990915 or ss991029 libpcap. */
3165 ldat->byte_swapped = FALSE;
3166 ldat->modified = TRUE;
3168 case PCAP_SWAPPED_MAGIC:
3169 /* Host that wrote it has a byte order opposite to ours,
3170 and was running a program using either standard or
3171 ss990417 libpcap. */
3172 ldat->byte_swapped = TRUE;
3173 ldat->modified = FALSE;
3175 case PCAP_SWAPPED_MODIFIED_MAGIC:
3176 /* Host that wrote it out has a byte order opposite to
3177 ours, and was running a program using either ss990915
3178 or ss991029 libpcap. */
3179 ldat->byte_swapped = TRUE;
3180 ldat->modified = TRUE;
3183 /* Not a "libpcap" type we know about. */
3184 g_snprintf(errmsg, errmsgl, "Unrecognized libpcap format");
3188 /* Read the rest of the header */
3190 while (bytes_read < sizeof(struct pcap_hdr)) {
3191 b = read(fd, ((char *)hdr)+bytes_read,
3192 sizeof(struct pcap_hdr) - bytes_read);
3195 g_snprintf(errmsg, errmsgl, "End of file on pipe during open");
3197 g_snprintf(errmsg, errmsgl, "Error on pipe during open: %s",
3204 if (ldat->byte_swapped) {
3205 /* Byte-swap the header fields about which we care. */
3206 hdr->version_major = BSWAP16(hdr->version_major);
3207 hdr->version_minor = BSWAP16(hdr->version_minor);
3208 hdr->snaplen = BSWAP32(hdr->snaplen);
3209 hdr->network = BSWAP32(hdr->network);
3212 if (hdr->version_major < 2) {
3213 g_snprintf(errmsg, errmsgl, "Unable to read old libpcap format");
3217 ldat->pipe_state = STATE_EXPECT_REC_HDR;
3218 ldat->pipe_err = PIPOK;
3222 ldat->pipe_err = PIPERR;
3227 /* We read one record from the pipe, take care of byte order in the record
3228 * header, write the record in the capture file, and update capture statistics. */
3231 pipe_dispatch(int fd, loop_data *ldat, struct pcap_hdr *hdr,
3232 struct pcaprec_modified_hdr *rechdr, guchar *data,
3233 char *errmsg, int errmsgl)
3235 struct pcap_pkthdr phdr;
3237 enum { PD_REC_HDR_READ, PD_DATA_READ, PD_PIPE_EOF, PD_PIPE_ERR,
3240 switch (ldat->pipe_state) {
3242 case STATE_EXPECT_REC_HDR:
3243 ldat->bytes_to_read = ldat->modified ?
3244 sizeof(struct pcaprec_modified_hdr) : sizeof(struct pcaprec_hdr);
3245 ldat->bytes_read = 0;
3246 ldat->pipe_state = STATE_READ_REC_HDR;
3249 case STATE_READ_REC_HDR:
3250 b = read(fd, ((char *)rechdr)+ldat->bytes_read,
3251 ldat->bytes_to_read - ldat->bytes_read);
3254 result = PD_PIPE_EOF;
3256 result = PD_PIPE_ERR;
3259 if ((ldat->bytes_read += b) < ldat->bytes_to_read)
3261 result = PD_REC_HDR_READ;
3264 case STATE_EXPECT_DATA:
3265 ldat->bytes_read = 0;
3266 ldat->pipe_state = STATE_READ_DATA;
3269 case STATE_READ_DATA:
3270 b = read(fd, data+ldat->bytes_read, rechdr->hdr.incl_len - ldat->bytes_read);
3273 result = PD_PIPE_EOF;
3275 result = PD_PIPE_ERR;
3278 if ((ldat->bytes_read += b) < rechdr->hdr.incl_len)
3280 result = PD_DATA_READ;
3284 g_snprintf(errmsg, errmsgl, "pipe_dispatch: invalid state");
3287 } /* switch (ldat->pipe_state) */
3290 * We've now read as much data as we were expecting, so process it.
3294 case PD_REC_HDR_READ:
3295 /* We've read the header. Take care of byte order. */
3296 adjust_header(ldat, hdr, &rechdr->hdr);
3297 if (rechdr->hdr.incl_len > WTAP_MAX_PACKET_SIZE) {
3298 g_snprintf(errmsg, errmsgl, "Frame %u too long (%d bytes)",
3299 ldat->packet_count+1, rechdr->hdr.incl_len);
3302 ldat->pipe_state = STATE_EXPECT_DATA;
3306 /* Fill in a "struct pcap_pkthdr", and process the packet. */
3307 phdr.ts.tv_sec = rechdr->hdr.ts_sec;
3308 phdr.ts.tv_usec = rechdr->hdr.ts_usec;
3309 phdr.caplen = rechdr->hdr.incl_len;
3310 phdr.len = rechdr->hdr.orig_len;
3312 capture_pcap_cb((u_char *)ldat, &phdr, data);
3314 ldat->pipe_state = STATE_EXPECT_REC_HDR;
3318 ldat->pipe_err = PIPEOF;
3322 g_snprintf(errmsg, errmsgl, "Error reading from pipe: %s",
3329 ldat->pipe_err = PIPERR;
3330 /* Return here rather than inside the switch to prevent GCC warning */
3334 #endif /* HAVE_LIBPCAP */
3337 * General errors are reported with an console message in Tethereal.
3340 failure_message(const char *msg_format, va_list ap)
3342 fprintf(stderr, "tethereal: ");
3343 vfprintf(stderr, msg_format, ap);
3344 fprintf(stderr, "\n");
3348 * Read errors are reported with an console message in Tethereal.
3351 read_failure_message(const char *filename, int err)
3353 fprintf(stderr, "tethereal: An error occurred while reading from the file \"%s\": %s.\n",
3354 filename, strerror(err));