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_SNPRINTF_H
55 # include "snprintf.h"
58 #ifdef NEED_STRERROR_H
66 #include "svnversion.h"
69 #include <epan/epan.h>
70 #include <epan/filesystem.h>
73 #include <epan/timestamp.h>
74 #include <epan/packet.h>
76 #include "disabled_protos.h"
77 #include <epan/prefs.h>
78 #include <epan/column.h>
80 #include <epan/addr_resolv.h>
82 #include "clopts_common.h"
83 #include "version_info.h"
84 #include <epan/conversation.h>
85 #include <epan/plugins.h>
87 #include "conditions.h"
88 #include "capture_stop_conditions.h"
89 #include "ringbuffer.h"
90 #include "capture_ui_utils.h"
91 #include <epan/epan_dissect.h>
93 #include <epan/timestamp.h>
98 #include "pcap-util.h"
99 #include <wiretap/wtap-capture.h>
100 #include <wiretap/libpcap.h>
102 #include "capture-wpcap.h"
105 #endif /* HAVE_LIBPCAP */
109 * This is the template for the decode as option; it is shared between the
110 * various functions that output the usage for this parameter.
112 static const gchar decode_as_arg_template[] = "<layer_type>==<selector>,<decode_as_protocol>";
114 static guint32 firstsec, firstusec;
115 static guint32 prevsec, prevusec;
116 static GString *comp_info_str, *runtime_info_str;
118 static gboolean print_packet_info; /* TRUE if we're to print packet information */
120 * The way the packet decode is to be written.
123 WRITE_TEXT, /* summary or detail text */
124 WRITE_XML /* PDML or PSML */
125 /* Add CSV and the like here */
127 static output_action_e output_action;
128 static gboolean do_dissection; /* TRUE if we have to dissect each packet */
129 static gboolean verbose;
130 static gboolean print_hex;
131 static gboolean line_buffered;
132 static guint32 cum_bytes = 0;
133 static print_format_e print_format = PR_FMT_TEXT;
134 static print_stream_t *print_stream;
138 * TRUE if we're to print packet counts to keep track of captured packets.
140 static gboolean print_packet_counts;
142 typedef struct _loop_data {
143 gboolean go; /* TRUE as long as we're supposed to keep capturing */
145 gboolean from_pipe; /* TRUE if we are capturing data from a pipe */
147 char *save_file; /* Name of file to which we're writing */
150 gboolean output_to_pipe;
153 gboolean modified; /* TRUE if data in the pipe uses modified pcap headers */
154 gboolean byte_swapped; /* TRUE if data in the pipe is byte swapped */
155 unsigned int bytes_to_read, bytes_read; /* Used by pipe_dispatch */
157 STATE_EXPECT_REC_HDR, STATE_READ_REC_HDR,
158 STATE_EXPECT_DATA, STATE_READ_DATA
160 enum { PIPOK, PIPEOF, PIPERR, PIPNEXIST } pipe_err;
167 static capture_options capture_opts;
171 static gboolean infodelay; /* if TRUE, don't print capture info in SIGINFO handler */
172 static gboolean infoprint; /* if TRUE, print capture info after clearing infodelay */
174 #endif /* HAVE_LIBPCAP */
177 static int capture(char *, int);
178 static void capture_pcap_cb(guchar *, const struct pcap_pkthdr *,
180 static void report_counts(void);
182 static BOOL WINAPI capture_cleanup(DWORD);
184 static void capture_cleanup(int);
186 static void report_counts_siginfo(int);
189 #endif /* HAVE_LIBPCAP */
191 static int load_cap_file(capture_file *, char *, int);
192 static gboolean process_packet(capture_file *cf, wtap_dumper *pdh, long offset,
193 const struct wtap_pkthdr *whdr, union wtap_pseudo_header *pseudo_header,
194 const guchar *pd, int *err);
195 static void show_capture_file_io_error(const char *, int, gboolean);
196 static void show_print_file_io_error(int err);
197 static gboolean write_preamble(capture_file *cf);
198 static gboolean print_packet(capture_file *cf, epan_dissect_t *edt);
199 static gboolean write_finale(void);
200 static char *cf_open_error_message(int err, gchar *err_info,
201 gboolean for_writing, int file_type);
204 static void adjust_header(loop_data *, struct pcap_hdr *, struct pcaprec_hdr *);
205 static int pipe_open_live(char *, struct pcap_hdr *, loop_data *, char *, int);
206 static int pipe_dispatch(int, loop_data *, struct pcap_hdr *, \
207 struct pcaprec_modified_hdr *, guchar *, char *, int);
211 static void open_failure_message(const char *filename, int err,
212 gboolean for_writing);
213 static void failure_message(const char *msg_format, va_list ap);
214 static void read_failure_message(const char *filename, int err);
220 print_usage(gboolean print_ver)
227 fprintf(output, "This is GNU t" PACKAGE " " VERSION
231 "\n (C) 1998-2004 Gerald Combs <gerald@ethereal.com>"
234 comp_info_str->str, runtime_info_str->str);
239 fprintf(output, "\nt%s [ -vh ] [ -DlLnpqSVx ] [ -a <capture autostop condition> ] ...\n",
241 fprintf(output, "\t[ -b <number of ring buffer files>[:<duration>] ] [ -c <count> ]\n");
242 fprintf(output, "\t[ -d %s ] ...\n", decode_as_arg_template);
243 fprintf(output, "\t[ -f <capture filter> ] [ -F <output file type> ] [ -i <interface> ]\n");
244 fprintf(output, "\t[ -N <resolving> ] [ -o <preference setting> ] ... [ -r <infile> ]\n");
245 fprintf(output, "\t[ -R <read filter> ] [ -s <snaplen> ] [ -t <time stamp format> ]\n");
246 fprintf(output, "\t[ -T pdml|ps|psml|text ] [ -w <savefile> ] [ -y <link type> ]\n");
247 fprintf(output, "\t[ -z <statistics string> ]\n");
249 fprintf(output, "\nt%s [ -vh ] [ -lnVx ]\n", PACKAGE);
250 fprintf(output, "\t[ -d %s ] ...\n", decode_as_arg_template);
251 fprintf(output, "\t[ -F <output file type> ] [ -N <resolving> ]\n");
252 fprintf(output, "\t[ -o <preference setting> ] ... [ -r <infile> ] [ -R <read filter> ]\n");
253 fprintf(output, "\t[ -t <time stamp format> ] [ -T pdml|ps|psml|text ] [ -w <savefile> ]\n");
254 fprintf(output, "\t[ -z <statistics string> ]\n");
256 fprintf(output, "Valid file type arguments to the \"-F\" flag:\n");
257 for (i = 0; i < WTAP_NUM_FILE_TYPES; i++) {
258 if (wtap_dump_can_open(i))
259 fprintf(output, "\t%s - %s\n",
260 wtap_file_type_short_string(i), wtap_file_type_string(i));
262 fprintf(output, "\tdefault is libpcap\n");
266 * For a dissector table, print on the stream described by output,
267 * its short name (which is what's used in the "-d" option) and its
271 display_dissector_table_names(char *table_name, char *ui_name, gpointer output)
273 fprintf((FILE *)output, "\t%s (%s)\n", table_name, ui_name);
277 * For a dissector handle, print on the stream described by output,
278 * the filter name (which is what's used in the "-d" option) and the full
279 * name for the protocol that corresponds to this handle.
282 display_dissector_names(gchar *table _U_, gpointer handle, gpointer output)
285 const gchar* proto_filter_name;
286 const gchar* proto_ui_name;
288 proto_id = dissector_handle_get_protocol_index((dissector_handle_t)handle);
290 if (proto_id != -1) {
291 proto_filter_name = proto_get_protocol_filter_name(proto_id);
292 proto_ui_name = proto_get_protocol_name(proto_id);
293 g_assert(proto_filter_name != NULL);
294 g_assert(proto_ui_name != NULL);
296 fprintf((FILE *)output, "\t%s (%s)\n",
303 * The protocol_name_search structure is used by find_protocol_name_func()
304 * to pass parameters and store results
306 struct protocol_name_search{
307 gchar *searched_name; /* Protocol filter name we are looking for */
308 dissector_handle_t matched_handle; /* Handle for a dissector whose protocol has the specified filter name */
309 guint nb_match; /* How many dissectors matched searched_name */
311 typedef struct protocol_name_search *protocol_name_search_t;
314 * This function parses all dissectors associated with a table to find the
315 * one whose protocol has the specified filter name. It is called
316 * as a reference function in a call to dissector_table_foreach_handle.
317 * The name we are looking for, as well as the results, are stored in the
318 * protocol_name_search struct pointed to by user_data.
319 * If called using dissector_table_foreach_handle, we actually parse the
320 * whole list of dissectors.
323 find_protocol_name_func(gchar *table _U_, gpointer handle, gpointer user_data)
327 const gchar *protocol_filter_name;
328 protocol_name_search_t search_info;
332 search_info = (protocol_name_search_t)user_data;
334 proto_id = dissector_handle_get_protocol_index((dissector_handle_t)handle);
335 if (proto_id != -1) {
336 protocol_filter_name = proto_get_protocol_filter_name(proto_id);
337 g_assert(protocol_filter_name != NULL);
338 if (strcmp(protocol_filter_name, search_info->searched_name) == 0) {
340 if (search_info->nb_match == 0) {
341 /* Record this handle only if this is the first match */
342 search_info->matched_handle = (dissector_handle_t)handle; /* Record the handle for this matching dissector */
344 search_info->nb_match++;
350 * Print all layer type names supported.
351 * We send the output to the stream described by the handle output.
355 fprint_all_layer_types(FILE *output)
358 dissector_all_tables_foreach_table(display_dissector_table_names, (gpointer)output);
362 * Print all protocol names supported for a specific layer type.
363 * table_name contains the layer type name in which the search is performed.
364 * We send the output to the stream described by the handle output.
368 fprint_all_protocols_for_layer_types(FILE *output, gchar *table_name)
371 dissector_table_foreach_handle(table_name,
372 display_dissector_names,
377 * The function below parses the command-line parameters for the decode as
378 * feature (a string pointer by cl_param).
379 * It checks the format of the command-line, searches for a matching table
380 * and dissector. If a table/dissector match is not found, we display a
381 * summary of the available tables/dissectors (on stderr) and return FALSE.
382 * If everything is fine, we get the "Decode as" preference activated,
383 * then we return TRUE.
386 add_decode_as(const gchar *cl_param)
390 gchar *decoded_param;
391 gchar *remaining_param;
393 gchar *dissector_str;
394 dissector_handle_t dissector_matching;
395 dissector_table_t table_matching;
396 ftenum_t dissector_table_selector_type;
397 struct protocol_name_search user_protocol_name;
399 /* The following code will allocate and copy the command-line options in a string pointed by decoded_param */
402 decoded_param = g_malloc( sizeof(gchar) * (strlen(cl_param) + 1) ); /* Allocate enough space to have a working copy of the command-line parameter */
403 g_assert(decoded_param);
404 strcpy(decoded_param, cl_param);
407 /* The lines below will parse this string (modifying it) to extract all
408 necessary information. Note that decoded_param is still needed since
409 strings are not copied - we just save pointers. */
411 /* This section extracts a layer type (table_name) from decoded_param */
412 table_name = decoded_param; /* Layer type string starts from beginning */
414 remaining_param = strchr(table_name, '=');
415 if (remaining_param == NULL) {
416 fprintf(stderr, "tethereal: Parameter \"%s\" doesn't follow the template \"%s\"\n", cl_param, decode_as_arg_template);
417 /* If the argument does not follow the template, carry on anyway to check
418 if the table name is at least correct. If remaining_param is NULL,
419 we'll exit anyway further down */
422 *remaining_param = '\0'; /* Terminate the layer type string (table_name) where '=' was detected */
425 /* Remove leading and trailing spaces from the table name */
426 while ( table_name[0] == ' ' )
428 while ( table_name[strlen(table_name) - 1] == ' ' )
429 table_name[strlen(table_name) - 1] = '\0'; /* Note: if empty string, while loop will eventually exit */
431 /* The following part searches a table matching with the layer type specified */
432 table_matching = NULL;
434 /* Look for the requested table */
435 if ( !(*(table_name)) ) { /* Is the table name empty, if so, don't even search for anything, display a message */
436 fprintf(stderr, "tethereal: No layer type specified\n"); /* Note, we don't exit here, but table_matching will remain NULL, so we exit below */
439 table_matching = find_dissector_table(table_name);
440 if (!table_matching) {
441 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 */
445 if (!table_matching) {
446 /* Display a list of supported layer types to help the user, if the
447 specified layer type was not found */
448 fprintf(stderr, "tethereal: Valid layer types are:\n");
449 fprint_all_layer_types(stderr);
451 if (remaining_param == NULL || !table_matching) {
452 /* Exit if the layer type was not found, or if no '=' separator was found
454 g_free(decoded_param);
458 if (*(remaining_param + 1) != '=') { /* Check for "==" and not only '=' */
459 fprintf(stderr, "tethereal: WARNING: -d requires \"==\" instead of \"=\". Option will be treated as \"%s==%s\"\n", table_name, remaining_param + 1);
462 remaining_param++; /* Move to the second '=' */
463 *remaining_param = '\0'; /* Remove the second '=' */
465 remaining_param++; /* Position after the layer type string */
467 /* This section extracts a selector value (selector_str) from decoded_param */
469 selector_str = remaining_param; /* Next part starts with the selector number */
471 remaining_param = strchr(selector_str, ',');
472 if (remaining_param == NULL) {
473 fprintf(stderr, "tethereal: Parameter \"%s\" doesn't follow the template \"%s\"\n", cl_param, decode_as_arg_template);
474 /* If the argument does not follow the template, carry on anyway to check
475 if the selector value is at least correct. If remaining_param is NULL,
476 we'll exit anyway further down */
479 *remaining_param = '\0'; /* Terminate the selector number string (selector_str) where ',' was detected */
482 dissector_table_selector_type = get_dissector_table_selector_type(table_name);
484 switch (dissector_table_selector_type) {
490 /* The selector for this table is an unsigned number. Parse it as such.
491 There's no need to remove leading and trailing spaces from the
492 selector number string, because sscanf will do that for us. */
493 if ( sscanf(selector_str, "%u", &selector) != 1 ) {
494 fprintf(stderr, "tethereal: Invalid selector number \"%s\"\n", selector_str);
495 g_free(decoded_param);
502 /* The selector for this table is a string. */
506 /* There are currently no dissector tables with any types other
507 than the ones listed above. */
508 g_assert_not_reached();
511 if (remaining_param == NULL) {
512 /* Exit if no ',' separator was found (see above) */
513 fprintf(stderr, "tethereal: Valid protocols for layer type \"%s\" are:\n", table_name);
514 fprint_all_protocols_for_layer_types(stderr, table_name);
515 g_free(decoded_param);
519 remaining_param++; /* Position after the selector number string */
521 /* This section extracts a protocol filter name (dissector_str) from decoded_param */
523 dissector_str = remaining_param; /* All the rest of the string is the dissector (decode as protocol) name */
525 /* Remove leading and trailing spaces from the dissector name */
526 while ( dissector_str[0] == ' ' )
528 while ( dissector_str[strlen(dissector_str) - 1] == ' ' )
529 dissector_str[strlen(dissector_str) - 1] = '\0'; /* Note: if empty string, while loop will eventually exit */
531 dissector_matching = NULL;
533 /* We now have a pointer to the handle for the requested table inside the variable table_matching */
534 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 */
535 fprintf(stderr, "tethereal: No protocol name specified\n"); /* Note, we don't exit here, but dissector_matching will remain NULL, so we exit below */
538 user_protocol_name.nb_match = 0;
539 user_protocol_name.searched_name = dissector_str;
540 user_protocol_name.matched_handle = NULL;
542 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 */
544 if (user_protocol_name.nb_match != 0) {
545 dissector_matching = user_protocol_name.matched_handle;
546 if (user_protocol_name.nb_match > 1) {
547 fprintf(stderr, "tethereal: WARNING: Protocol \"%s\" matched %u dissectors, first one will be used\n", dissector_str, user_protocol_name.nb_match);
551 /* OK, check whether the problem is that there isn't any such
552 protocol, or that there is but it's not specified as a protocol
553 that's valid for that dissector table.
554 Note, we don't exit here, but dissector_matching will remain NULL,
556 if (proto_get_id_by_filter_name(dissector_str) == -1) {
557 /* No such protocol */
558 fprintf(stderr, "tethereal: Unknown protocol -- \"%s\"\n", dissector_str);
560 fprintf(stderr, "tethereal: Protocol \"%s\" isn't valid for layer type \"%s\"\n",
561 dissector_str, table_name);
566 if (!dissector_matching) {
567 fprintf(stderr, "tethereal: Valid protocols for layer type \"%s\" are:\n", table_name);
568 fprint_all_protocols_for_layer_types(stderr, table_name);
569 g_free(decoded_param);
573 /* This is the end of the code that parses the command-line options.
574 All information is now stored in the variables:
578 The above variables that are strings are still pointing to areas within
579 decoded_parm. decoded_parm thus still needs to be kept allocated in
580 until we stop needing these variables
581 decoded_param will be deallocated at each exit point of this function */
584 /* We now have a pointer to the handle for the requested dissector
585 (requested protocol) inside the variable dissector_matching */
586 switch (dissector_table_selector_type) {
592 /* The selector for this table is an unsigned number. */
593 dissector_change(table_name, selector, dissector_matching);
598 /* The selector for this table is a string. */
599 dissector_change_string(table_name, selector_str, dissector_matching);
603 /* There are currently no dissector tables with any types other
604 than the ones listed above. */
605 g_assert_not_reached();
607 g_free(decoded_param); /* "Decode As" rule has been succesfully added */
612 main(int argc, char *argv[])
616 gboolean arg_error = FALSE;
622 char *gpf_path, *pf_path;
623 char *gdp_path, *dp_path;
624 int gpf_open_errno, gpf_read_errno;
625 int pf_open_errno, pf_read_errno;
626 int gdp_open_errno, gdp_read_errno;
627 int dp_open_errno, dp_read_errno;
630 gboolean capture_filter_specified = FALSE;
631 GList *if_list, *if_entry;
635 gchar err_str[PCAP_ERRBUF_SIZE];
636 gchar *cant_get_if_list_errstr;
637 gboolean list_link_layer_types = FALSE;
639 gboolean capture_option_specified = FALSE;
641 gboolean quiet = FALSE;
642 gchar *save_file = NULL;
643 int out_file_type = WTAP_FILE_PCAP;
644 gchar *cf_name = NULL, *rfilter = NULL;
646 gboolean start_capture = FALSE;
648 GList *lt_list, *lt_entry;
649 data_link_info_t *data_link_info;
651 #ifdef HAVE_PCAP_OPEN_DEAD
652 struct bpf_program fcode;
654 dfilter_t *rfcode = NULL;
659 capture_opts_init(&capture_opts, NULL /* cfile */);
662 set_timestamp_setting(TS_RELATIVE);
664 /* Register all dissectors; we must do this before checking for the
665 "-G" flag, as the "-G" flag dumps information registered by the
666 dissectors, and we must do it before we read the preferences, in
667 case any dissectors register preferences. */
668 epan_init(PLUGIN_DIR,register_all_protocols,register_all_protocol_handoffs,
669 failure_message,open_failure_message,read_failure_message);
671 /* Register all tap listeners; we do this before we parse the arguments,
672 as the "-z" argument can specify a registered tap. */
674 /* we register the plugin taps before the other taps because
675 stats_tree taps plugins will be registered as tap listeners
676 by stats_tree_stat.c and need to registered before that */
678 register_all_plugin_tap_listeners();
680 register_all_tap_listeners();
682 /* Now register the preferences for any non-dissector modules.
683 We must do that before we read the preferences as well. */
684 prefs_register_modules();
686 /* If invoked with the "-G" flag, we dump out information based on
687 the argument to the "-G" flag; if no argument is specified,
688 for backwards compatibility we dump out a glossary of display
691 We do this here to mirror what happens in the GTK+ version, although
692 it's not necessary here. */
693 handle_dashG_option(argc, argv, "tethereal");
695 /* Set the C-language locale to the native environment. */
696 setlocale(LC_ALL, "");
698 prefs = read_prefs(&gpf_open_errno, &gpf_read_errno, &gpf_path,
699 &pf_open_errno, &pf_read_errno, &pf_path);
700 if (gpf_path != NULL) {
701 if (gpf_open_errno != 0) {
702 fprintf(stderr, "Can't open global preferences file \"%s\": %s.\n",
703 pf_path, strerror(gpf_open_errno));
705 if (gpf_read_errno != 0) {
706 fprintf(stderr, "I/O error reading global preferences file \"%s\": %s.\n",
707 pf_path, strerror(gpf_read_errno));
710 if (pf_path != NULL) {
711 if (pf_open_errno != 0) {
712 fprintf(stderr, "Can't open your preferences file \"%s\": %s.\n", pf_path,
713 strerror(pf_open_errno));
715 if (pf_read_errno != 0) {
716 fprintf(stderr, "I/O error reading your preferences file \"%s\": %s.\n",
717 pf_path, strerror(pf_read_errno));
723 /* Set the name resolution code's flags from the preferences. */
724 g_resolv_flags = prefs->name_resolve;
726 /* Read the disabled protocols file. */
727 read_disabled_protos_list(&gdp_path, &gdp_open_errno, &gdp_read_errno,
728 &dp_path, &dp_open_errno, &dp_read_errno);
729 if (gdp_path != NULL) {
730 if (gdp_open_errno != 0) {
732 "Could not open global disabled protocols file\n\"%s\": %s.\n",
733 gdp_path, strerror(gdp_open_errno));
735 if (gdp_read_errno != 0) {
737 "I/O error reading global disabled protocols file\n\"%s\": %s.\n",
738 gdp_path, strerror(gdp_read_errno));
742 if (dp_path != NULL) {
743 if (dp_open_errno != 0) {
745 "Could not open your disabled protocols file\n\"%s\": %s.\n", dp_path,
746 strerror(dp_open_errno));
748 if (dp_read_errno != 0) {
750 "I/O error reading your disabled protocols file\n\"%s\": %s.\n", dp_path,
751 strerror(dp_read_errno));
757 /* Load Wpcap, if possible */
761 init_cap_file(&cfile);
763 /* Assemble the compile-time version information string */
764 comp_info_str = g_string_new("Compiled ");
765 get_compiled_version_info(comp_info_str);
767 /* Assemble the run-time version information string */
768 runtime_info_str = g_string_new("Running ");
769 get_runtime_version_info(runtime_info_str);
771 /* Print format defaults to this. */
772 print_format = PR_FMT_TEXT;
774 /* Now get our args */
775 while ((opt = getopt(argc, argv, "a:b:c:d:Df:F:hi:lLnN:o:pqr:R:s:St:T:vw:Vxy:z:")) != -1) {
777 case 'a': /* autostop criteria */
778 case 'b': /* Ringbuffer option */
779 case 'c': /* Capture xxx packets */
780 case 'f': /* capture filter */
781 case 'p': /* Don't capture in promiscuous mode */
782 case 's': /* Set the snapshot (capture) length */
783 case 'y': /* Set the pcap data link type */
785 capture_opts_add_opt(&capture_opts, "tethereal", opt, optarg, &start_capture);
787 capture_option_specified = TRUE;
791 case 'd': /* Decode as rule */
792 if (!add_decode_as(optarg))
795 case 'D': /* Print a list of capture devices */
797 if_list = get_interface_list(&err, err_str);
798 if (if_list == NULL) {
801 case CANT_GET_INTERFACE_LIST:
802 cant_get_if_list_errstr =
803 cant_get_if_list_error_message(err_str);
804 fprintf(stderr, "tethereal: %s\n", cant_get_if_list_errstr);
805 g_free(cant_get_if_list_errstr);
808 case NO_INTERFACES_FOUND:
809 fprintf(stderr, "tethereal: There are no interfaces on which a capture can be done\n");
814 i = 1; /* Interface id number */
815 for (if_entry = g_list_first(if_list); if_entry != NULL;
816 if_entry = g_list_next(if_entry)) {
817 if_info = if_entry->data;
818 printf("%d. %s", i++, if_info->name);
819 if (if_info->description != NULL)
820 printf(" (%s)", if_info->description);
823 free_interface_list(if_list);
826 capture_option_specified = TRUE;
831 out_file_type = wtap_short_string_to_file_type(optarg);
832 if (out_file_type < 0) {
833 fprintf(stderr, "tethereal: \"%s\" isn't a valid capture file type\n",
838 case 'h': /* Print help and exit */
842 case 'i': /* Use interface xxx */
845 * If the argument is a number, treat it as an index into the list
846 * of adapters, as printed by "tethereal -D".
848 * This should be OK on UNIX systems, as interfaces shouldn't have
849 * names that begin with digits. It can be useful on Windows, where
850 * more than one interface can have the same name.
852 adapter_index = strtol(optarg, &p, 10);
853 if (p != NULL && *p == '\0') {
854 if (adapter_index < 0) {
856 "tethereal: The specified adapter index is a negative number\n");
859 if (adapter_index > INT_MAX) {
861 "tethereal: The specified adapter index is too large (greater than %d)\n",
865 if (adapter_index == 0) {
866 fprintf(stderr, "tethereal: there is no interface with that adapter index\n");
869 if_list = get_interface_list(&err, err_str);
870 if (if_list == NULL) {
873 case CANT_GET_INTERFACE_LIST:
874 cant_get_if_list_errstr =
875 cant_get_if_list_error_message(err_str);
876 fprintf(stderr, "tethereal: %s\n", cant_get_if_list_errstr);
877 g_free(cant_get_if_list_errstr);
880 case NO_INTERFACES_FOUND:
881 fprintf(stderr, "tethereal: There are no interfaces on which a capture can be done\n");
886 if_info = g_list_nth_data(if_list, adapter_index - 1);
887 if (if_info == NULL) {
888 fprintf(stderr, "tethereal: there is no interface with that adapter index\n");
891 capture_opts.iface = g_strdup(if_info->name);
892 free_interface_list(if_list);
894 capture_opts.iface = g_strdup(optarg);
896 capture_option_specified = TRUE;
900 case 'l': /* "Line-buffer" standard output */
901 /* This isn't line-buffering, strictly speaking, it's just
902 flushing the standard output after the information for
903 each packet is printed; however, that should be good
904 enough for all the purposes to which "-l" is put (and
905 is probably actually better for "-V", as it does fewer
908 See the comment in "process_packet()" for an explanation of
909 why we do that, and why we don't just use "setvbuf()" to
910 make the standard output line-buffered (short version: in
911 Windows, "line-buffered" is the same as "fully-buffered",
912 and the output buffer is only flushed when it fills up). */
913 line_buffered = TRUE;
915 case 'L': /* Print list of link-layer types and exit */
917 list_link_layer_types = TRUE;
920 capture_option_specified = TRUE;
924 case 'n': /* No name resolution */
925 g_resolv_flags = RESOLV_NONE;
927 case 'N': /* Select what types of addresses/port #s to resolve */
928 if (g_resolv_flags == RESOLV_ALL)
929 g_resolv_flags = RESOLV_NONE;
930 badopt = string_to_name_resolve(optarg, &g_resolv_flags);
931 if (badopt != '\0') {
932 fprintf(stderr, "tethereal: -N specifies unknown resolving option '%c'; valid options are 'm', 'n', and 't'\n",
937 case 'o': /* Override preference from command line */
938 switch (prefs_set_pref(optarg)) {
940 case PREFS_SET_SYNTAX_ERR:
941 fprintf(stderr, "tethereal: Invalid -o flag \"%s\"\n", optarg);
945 case PREFS_SET_NO_SUCH_PREF:
946 case PREFS_SET_OBSOLETE:
947 fprintf(stderr, "tethereal: -o flag \"%s\" specifies unknown preference\n",
953 case 'q': /* Quiet */
956 case 'r': /* Read capture file xxx */
957 cf_name = g_strdup(optarg);
959 case 'R': /* Read file filter */
962 case 'S': /* show packets in real time */
963 print_packet_info = TRUE;
965 case 't': /* Time stamp type */
966 if (strcmp(optarg, "r") == 0)
967 set_timestamp_setting(TS_RELATIVE);
968 else if (strcmp(optarg, "a") == 0)
969 set_timestamp_setting(TS_ABSOLUTE);
970 else if (strcmp(optarg, "ad") == 0)
971 set_timestamp_setting(TS_ABSOLUTE_WITH_DATE);
972 else if (strcmp(optarg, "d") == 0)
973 set_timestamp_setting(TS_DELTA);
975 fprintf(stderr, "tethereal: Invalid time stamp type \"%s\"\n",
977 fprintf(stderr, "It must be \"r\" for relative, \"a\" for absolute,\n");
978 fprintf(stderr, "\"ad\" for absolute with date, or \"d\" for delta.\n");
982 case 'T': /* printing Type */
983 if (strcmp(optarg, "text") == 0) {
984 output_action = WRITE_TEXT;
985 print_format = PR_FMT_TEXT;
986 } else if (strcmp(optarg, "ps") == 0) {
987 output_action = WRITE_TEXT;
988 print_format = PR_FMT_PS;
989 } else if (strcmp(optarg, "pdml") == 0) {
990 output_action = WRITE_XML;
992 } else if (strcmp(optarg, "psml") == 0) {
993 output_action = WRITE_XML;
996 fprintf(stderr, "tethereal: Invalid -T parameter.\n");
997 fprintf(stderr, "It must be \"ps\", \"text\", \"pdml\", or \"psml\".\n");
1001 case 'v': /* Show version and exit */
1002 printf("t" PACKAGE " " VERSION
1007 comp_info_str->str, runtime_info_str->str);
1010 case 'w': /* Write to capture file xxx */
1011 save_file = g_strdup(optarg);
1013 case 'V': /* Verbose */
1016 case 'x': /* Print packet data in hex (and ASCII) */
1020 /* We won't call the init function for the tap this soon
1021 as it would disallow MATE's fields (which are registered
1022 by the preferences set callback) from being used as
1023 part of a tap filter. Instead, we just add the argument
1024 to a list of tap arguments. */
1025 if (!process_tap_cmd_arg(optarg)) {
1026 fprintf(stderr,"tethereal: invalid -z argument.\n");
1027 fprintf(stderr," -z argument must be one of :\n");
1028 list_tap_cmd_args();
1033 case '?': /* Bad flag - print usage message */
1039 /* If no capture filter or read filter has been specified, and there are
1040 still command-line arguments, treat them as the tokens of a capture
1041 filter (if no "-r" flag was specified) or a read filter (if a "-r"
1042 flag was specified. */
1043 if (optind < argc) {
1044 if (cf_name != NULL) {
1045 if (rfilter != NULL) {
1047 "tethereal: Read filters were specified both with \"-R\" and with additional command-line arguments\n");
1050 rfilter = get_args_as_string(argc, argv, optind);
1053 if (capture_filter_specified) {
1055 "tethereal: Capture filters were specified both with \"-f\" and with additional command-line arguments\n");
1058 capture_opts.cfilter = get_args_as_string(argc, argv, optind);
1060 capture_option_specified = TRUE;
1065 /* See if we're writing a capture file and the file is a pipe */
1067 ld.output_to_pipe = FALSE;
1069 if (save_file != NULL) {
1070 /* We're writing to a capture file. */
1071 if (strcmp(save_file, "-") == 0) {
1072 /* Write to the standard output. */
1074 save_file = g_strdup("");
1076 /* XXX - should we check whether it's a pipe? It's arguably
1077 silly to do "-w - >output_file" rather than "-w output_file",
1078 but by not checking we might be violating the Principle Of
1079 Least Astonishment. */
1080 ld.output_to_pipe = TRUE;
1085 err = test_for_fifo(save_file);
1088 case ENOENT: /* it doesn't exist, so we'll be creating it,
1089 and it won't be a FIFO */
1090 case 0: /* found it, but it's not a FIFO */
1093 case ESPIPE: /* it is a FIFO */
1094 ld.output_to_pipe = TRUE;
1097 default: /* couldn't stat it */
1099 "tethereal: Error testing whether capture file is a pipe: %s\n",
1106 /* We're not writing to a file, so we should print packet information
1107 unless "-q" was specified. */
1109 print_packet_info = TRUE;
1112 #ifndef HAVE_LIBPCAP
1113 if (capture_option_specified)
1114 fprintf(stderr, "This version of Tethereal was not built with support for capturing packets.\n");
1121 /* We don't support capture filters when reading from a capture file
1122 (the BPF compiler doesn't support all link-layer types that we
1123 support in capture files we read). */
1125 if (cf_name != NULL) {
1126 if (capture_filter_specified) {
1128 "tethereal: Only read filters, not capture filters, can be specified when reading a capture file.\n");
1135 if (output_action != WRITE_TEXT) {
1136 fprintf(stderr, "tethereal: Raw packet hex data can only be printed as text or PostScript\n");
1142 if (list_link_layer_types) {
1143 /* We're supposed to list the link-layer types for an interface;
1144 did the user also specify a capture file to be read? */
1146 /* Yes - that's bogus. */
1147 fprintf(stderr, "tethereal: You can't specify -L and a capture file to be read.\n");
1150 /* No - did they specify a ring buffer option? */
1151 if (capture_opts.multi_files_on) {
1152 fprintf(stderr, "tethereal: Ring buffer requested, but a capture isn't being done.\n");
1156 /* If they didn't specify a "-w" flag, but specified a maximum capture
1157 file size, tell them that this doesn't work, and exit. */
1158 if (capture_opts.has_autostop_filesize && save_file == NULL) {
1159 fprintf(stderr, "tethereal: Maximum capture file size specified, but "
1160 "capture isn't being saved to a file.\n");
1164 if (capture_opts.multi_files_on) {
1165 /* Ring buffer works only under certain conditions:
1166 a) ring buffer does not work if you're not saving the capture to
1168 b) ring buffer only works if you're saving in libpcap format;
1169 c) it makes no sense to enable the ring buffer if the maximum
1170 file size is set to "infinite";
1171 d) file must not be a pipe. */
1172 if (save_file == NULL) {
1173 fprintf(stderr, "tethereal: Ring buffer requested, but "
1174 "capture isn't being saved to a file.\n");
1177 if (out_file_type != WTAP_FILE_PCAP) {
1178 fprintf(stderr, "tethereal: Ring buffer requested, but "
1179 "capture isn't being saved in libpcap format.\n");
1182 if (!capture_opts.has_autostop_filesize) {
1183 fprintf(stderr, "tethereal: Ring buffer requested, but "
1184 "no maximum capture file size was specified.\n");
1187 if (ld.output_to_pipe) {
1188 fprintf(stderr, "tethereal: Ring buffer requested, but "
1189 "capture file is a pipe.\n");
1197 /* Start windows sockets */
1198 WSAStartup( MAKEWORD( 1, 1 ), &wsaData );
1201 /* Notify all registered modules that have had any of their preferences
1202 changed either from one of the preferences file or from the command
1203 line that their preferences have changed. */
1206 /* At this point MATE will have registered its field array so we can
1207 have a filter with one of MATE's late-registered fields as part
1208 of the tap's filter. We can now process all the "-z" arguments. */
1209 start_requested_taps();
1211 /* disabled protocols as per configuration file */
1212 if (gdp_path == NULL && dp_path == NULL) {
1213 set_disabled_protos_list();
1216 /* Build the column format array */
1217 col_setup(&cfile.cinfo, prefs->num_cols);
1218 for (i = 0; i < cfile.cinfo.num_cols; i++) {
1219 cfile.cinfo.col_fmt[i] = get_column_format(i);
1220 cfile.cinfo.col_title[i] = g_strdup(get_column_title(i));
1221 cfile.cinfo.fmt_matx[i] = (gboolean *) g_malloc0(sizeof(gboolean) *
1223 get_column_format_matches(cfile.cinfo.fmt_matx[i], cfile.cinfo.col_fmt[i]);
1224 cfile.cinfo.col_data[i] = NULL;
1225 if (cfile.cinfo.col_fmt[i] == COL_INFO)
1226 cfile.cinfo.col_buf[i] = (gchar *) g_malloc(sizeof(gchar) * COL_MAX_INFO_LEN);
1228 cfile.cinfo.col_buf[i] = (gchar *) g_malloc(sizeof(gchar) * COL_MAX_LEN);
1229 cfile.cinfo.col_fence[i] = 0;
1230 cfile.cinfo.col_expr[i] = (gchar *) g_malloc(sizeof(gchar) * COL_MAX_LEN);
1231 cfile.cinfo.col_expr_val[i] = (gchar *) g_malloc(sizeof(gchar) * COL_MAX_LEN);
1234 for (i = 0; i < cfile.cinfo.num_cols; i++) {
1237 for (j = 0; j < NUM_COL_FMTS; j++) {
1238 if (!cfile.cinfo.fmt_matx[i][j])
1241 if (cfile.cinfo.col_first[j] == -1)
1242 cfile.cinfo.col_first[j] = i;
1243 cfile.cinfo.col_last[j] = i;
1248 if (capture_opts.snaplen < 1)
1249 capture_opts.snaplen = WTAP_MAX_PACKET_SIZE;
1250 else if (capture_opts.snaplen < MIN_PACKET_SIZE)
1251 capture_opts.snaplen = MIN_PACKET_SIZE;
1253 /* Check the value range of the ring_num_files parameter */
1254 if (capture_opts.ring_num_files > RINGBUFFER_MAX_NUM_FILES)
1255 capture_opts.ring_num_files = RINGBUFFER_MAX_NUM_FILES;
1256 #if RINGBUFFER_MIN_NUM_FILES > 0
1257 else if (capture_opts.ring_num_files < RINGBUFFER_MIN_NUM_FILES)
1258 capture_opts.ring_num_files = RINGBUFFER_MIN_NUM_FILES;
1262 if (rfilter != NULL) {
1263 if (!dfilter_compile(rfilter, &rfcode)) {
1264 fprintf(stderr, "tethereal: %s\n", dfilter_error_msg);
1266 #ifdef HAVE_PCAP_OPEN_DEAD
1270 pc = pcap_open_dead(DLT_EN10MB, MIN_PACKET_SIZE);
1272 if (pcap_compile(pc, &fcode, rfilter, 0, 0) != -1) {
1274 " Note: That display filter code looks like a valid capture filter;\n"
1275 " maybe you mixed them up?\n");
1284 cfile.rfcode = rfcode;
1286 if (print_packet_info) {
1287 /* If we're printing as text or PostScript, we have
1288 to create a print stream. */
1289 if (output_action == WRITE_TEXT) {
1290 switch (print_format) {
1293 print_stream = print_stream_text_stdio_new(stdout);
1297 print_stream = print_stream_ps_stdio_new(stdout);
1301 g_assert_not_reached();
1306 /* We have to dissect each packet if:
1308 we're printing information about each packet;
1310 we're using a read filter on the packets;
1312 we're using any taps. */
1313 do_dissection = print_packet_info || rfcode || have_tap_listeners();
1317 * We're reading a capture file.
1322 * Immediately relinquish any set-UID or set-GID privileges we have;
1323 * we must not be allowed to read any capture files the user running
1324 * Tethereal can't open.
1330 if (cf_open(&cfile, cf_name, FALSE, &err) != CF_OK) {
1334 err = load_cap_file(&cfile, save_file, out_file_type);
1341 /* No capture file specified, so we're supposed to do a live capture
1342 (or get a list of link-layer types for a live capture device);
1343 do we have support for live captures? */
1348 fprintf(stderr, "tethereal: Could not load wpcap.dll.\n");
1353 /* Yes; did the user specify an interface to use? */
1354 if (capture_opts.iface == NULL) {
1355 /* No - is a default specified in the preferences file? */
1356 if (prefs->capture_device != NULL) {
1358 if_text = strrchr(prefs->capture_device, ' ');
1359 if (if_text == NULL) {
1360 capture_opts.iface = g_strdup(prefs->capture_device);
1362 capture_opts.iface = g_strdup(if_text + 1); /* Skip over space */
1365 /* No - pick the first one from the list of interfaces. */
1366 if_list = get_interface_list(&err, err_str);
1367 if (if_list == NULL) {
1370 case CANT_GET_INTERFACE_LIST:
1371 cant_get_if_list_errstr =
1372 cant_get_if_list_error_message(err_str);
1373 fprintf(stderr, "tethereal: %s\n", cant_get_if_list_errstr);
1374 g_free(cant_get_if_list_errstr);
1377 case NO_INTERFACES_FOUND:
1378 fprintf(stderr, "tethereal: There are no interfaces on which a capture can be done\n");
1383 if_info = if_list->data; /* first interface */
1384 capture_opts.iface = g_strdup(if_info->name);
1385 free_interface_list(if_list);
1389 if (list_link_layer_types) {
1390 /* We were asked to list the link-layer types for an interface.
1391 Get the list of link-layer types for the capture device. */
1392 lt_list = get_pcap_linktype_list(capture_opts.iface, err_str);
1393 if (lt_list == NULL) {
1394 if (err_str[0] != '\0') {
1395 fprintf(stderr, "tethereal: The list of data link types for the capture device could not be obtained (%s).\n"
1396 "Please check to make sure you have sufficient permissions, and that\n"
1397 "you have the proper interface or pipe specified.\n", err_str);
1399 fprintf(stderr, "tethereal: The capture device has no data link types.\n");
1402 fprintf(stderr, "Data link types (use option -y to set):\n");
1403 for (lt_entry = lt_list; lt_entry != NULL;
1404 lt_entry = g_list_next(lt_entry)) {
1405 data_link_info = lt_entry->data;
1406 fprintf(stderr, " %s", data_link_info->name);
1407 if (data_link_info->description != NULL)
1408 fprintf(stderr, " (%s)", data_link_info->description);
1410 fprintf(stderr, " (not supported)");
1413 free_pcap_linktype_list(lt_list);
1419 * The user didn't ask us not to print a count of packets as
1420 * they arrive, so do so.
1422 print_packet_counts = TRUE;
1425 capture(save_file, out_file_type);
1427 if (capture_opts.multi_files_on) {
1431 /* No - complain. */
1432 fprintf(stderr, "This version of Tethereal was not built with support for capturing packets.\n");
1437 draw_tap_listeners(TRUE);
1444 /* Do the low-level work of a capture.
1445 Returns TRUE if it succeeds, FALSE otherwise. */
1447 static condition *volatile cnd_ring_timeout = NULL; /* this must be visible in process_packet */
1450 capture(char *save_file, int out_file_type)
1454 gchar open_err_str[PCAP_ERRBUF_SIZE];
1455 gchar lookup_net_err_str[PCAP_ERRBUF_SIZE];
1456 bpf_u_int32 netnum, netmask;
1457 struct bpf_program fcode;
1458 const char *set_linktype_err_str;
1460 int volatile volatile_err = 0;
1461 int volatile inpkts = 0;
1463 char errmsg[1024+1];
1464 condition *volatile cnd_stop_capturesize = NULL;
1465 condition *volatile cnd_stop_timeout = NULL;
1468 void (*oldhandler)(int);
1469 static const char ppamsg[] = "can't find PPA for ";
1471 volatile int pipe_fd = -1;
1472 struct pcap_hdr hdr;
1473 struct pcaprec_modified_hdr rechdr;
1474 guchar pcap_data[WTAP_MAX_PACKET_SIZE];
1476 struct pcap_stat stats;
1479 dfilter_t *rfcode = NULL;
1482 /* Initialize all data structures used for dissection. */
1485 ld.linktype = WTAP_ENCAP_UNKNOWN;
1488 /* Open the network interface to capture from it.
1489 Some versions of libpcap may put warnings into the error buffer
1490 if they succeed; to tell if that's happened, we have to clear
1491 the error buffer, and check if it's still a null string. */
1492 open_err_str[0] = '\0';
1493 ld.pch = pcap_open_live(capture_opts.iface, capture_opts.snaplen,
1494 capture_opts.promisc_mode, 1000, open_err_str);
1496 if (ld.pch != NULL) {
1497 /* setting the data link type only works on real interfaces */
1498 if (capture_opts.linktype != -1) {
1499 set_linktype_err_str = set_pcap_linktype(ld.pch, capture_opts.iface,
1500 capture_opts.linktype);
1501 if (set_linktype_err_str != NULL) {
1502 snprintf(errmsg, sizeof errmsg, "Unable to set data link type (%s).",
1503 set_linktype_err_str);
1508 /* We couldn't open "cfile.iface" as a network device. */
1510 /* On Windows, we don't support capturing on pipes, so we give up. */
1512 /* On Win32 OSes, the capture devices are probably available to all
1513 users; don't warn about permissions problems.
1515 Do, however, warn that WAN devices aren't supported. */
1516 snprintf(errmsg, sizeof errmsg,
1517 "The capture session could not be initiated (%s).\n"
1518 "Please check that you have the proper interface specified.\n"
1520 "Note that the WinPcap 2.x version of the driver Ethereal uses for packet\n"
1521 "capture on Windows doesn't support capturing on PPP/WAN interfaces in\n"
1522 "Windows NT/2000/XP/2003 Server, and that the WinPcap 3.0 and later versions\n"
1523 "don't support capturing on PPP/WAN interfaces at all.\n",
1527 /* try to open cfile.iface as a pipe */
1528 pipe_fd = pipe_open_live(capture_opts.iface, &hdr, &ld, errmsg,
1531 if (pipe_fd == -1) {
1533 if (ld.pipe_err == PIPNEXIST) {
1534 /* Pipe doesn't exist, so output message for interface */
1536 /* If we got a "can't find PPA for XXX" message, warn the user (who
1537 is running Tethereal on HP-UX) that they don't have a version
1538 of libpcap that properly handles HP-UX (libpcap 0.6.x and later
1539 versions, which properly handle HP-UX, say "can't find /dev/dlpi
1540 PPA for XXX" rather than "can't find PPA for XXX"). */
1541 if (strncmp(open_err_str, ppamsg, sizeof ppamsg - 1) == 0)
1544 "You are running Tethereal with a version of the libpcap library\n"
1545 "that doesn't handle HP-UX network devices well; this means that\n"
1546 "Tethereal may not be able to capture packets.\n"
1548 "To fix this, you should install libpcap 0.6.2, or a later version\n"
1549 "of libpcap, rather than libpcap 0.4 or 0.5.x. It is available in\n"
1550 "packaged binary form from the Software Porting And Archive Centre\n"
1551 "for HP-UX; the Centre is at http://hpux.connect.org.uk/ - the page\n"
1552 "at the URL lists a number of mirror sites.";
1555 snprintf(errmsg, sizeof errmsg,
1556 "The capture session could not be initiated (%s).\n"
1557 "Please check to make sure you have sufficient permissions, and that\n"
1558 "you have the proper interface or pipe specified.%s", open_err_str,
1562 * Else pipe (or file) does exist and pipe_open_live() has
1567 /* pipe_open_live() succeeded; don't want
1568 error message from pcap_open_live() */
1569 open_err_str[0] = '\0';
1575 * We've opened the capture device, so, if we're set-UID or set-GID,
1576 * relinquish those privileges.
1578 * XXX - if we have saved set-user-ID support, we should give up those
1579 * privileges immediately, and then reclaim them long enough to get
1580 * a list of network interfaces and to open one, and then give them
1581 * up again, so that stuff we do while processing the argument list,
1582 * reading the user's preferences, etc. is done as the real user and
1583 * group, not the effective user and group.
1589 if (capture_opts.cfilter && !ld.from_pipe) {
1590 /* A capture filter was specified; set it up. */
1591 if (pcap_lookupnet(capture_opts.iface, &netnum, &netmask, lookup_net_err_str) < 0) {
1593 * Well, we can't get the netmask for this interface; it's used
1594 * only for filters that check for broadcast IP addresses, so
1595 * we just warn the user, and punt and use 0.
1598 "Warning: Couldn't obtain netmask info (%s).\n", lookup_net_err_str);
1601 if (pcap_compile(ld.pch, &fcode, capture_opts.cfilter, 1, netmask) < 0) {
1602 if (dfilter_compile(capture_opts.cfilter, &rfcode)) {
1603 snprintf(errmsg, sizeof errmsg,
1604 "Unable to parse capture filter string (%s).\n"
1605 " Interestingly enough, this looks like a valid display filter\n"
1606 " Are you sure you didn't mix them up?",
1607 pcap_geterr(ld.pch));
1609 snprintf(errmsg, sizeof errmsg,
1610 "Unable to parse capture filter string (%s).",
1611 pcap_geterr(ld.pch));
1615 if (pcap_setfilter(ld.pch, &fcode) < 0) {
1616 snprintf(errmsg, sizeof errmsg, "Can't install filter (%s).",
1617 pcap_geterr(ld.pch));
1618 #ifdef HAVE_PCAP_FREECODE
1619 pcap_freecode(&fcode);
1623 #ifdef HAVE_PCAP_FREECODE
1624 pcap_freecode(&fcode);
1628 /* Set up to write to the capture file. */
1631 pcap_encap = hdr.network;
1632 file_snaplen = hdr.snaplen;
1636 pcap_encap = get_pcap_linktype(ld.pch, capture_opts.iface);
1637 file_snaplen = pcap_snapshot(ld.pch);
1639 ld.linktype = wtap_pcap_encap_to_wtap_encap(pcap_encap);
1640 if (save_file != NULL) {
1641 /* Set up to write to the capture file. */
1642 if (ld.linktype == WTAP_ENCAP_UNKNOWN) {
1643 strcpy(errmsg, "The network you're capturing from is of a type"
1644 " that Tethereal doesn't support.");
1647 ld.save_file = save_file;
1648 if (capture_opts.multi_files_on) {
1649 save_file_fd = ringbuf_init(save_file,
1650 capture_opts.ring_num_files);
1651 if (save_file_fd != -1) {
1652 ld.pdh = ringbuf_init_wtap_dump_fdopen(out_file_type, ld.linktype,
1653 file_snaplen, &err);
1655 err = errno; /* "ringbuf_init()" failed */
1659 ld.pdh = wtap_dump_open(save_file, out_file_type,
1660 ld.linktype, file_snaplen, &err);
1663 if (ld.pdh == NULL) {
1664 snprintf(errmsg, sizeof errmsg,
1665 cf_open_error_message(err, NULL, TRUE, out_file_type),
1666 *save_file == '\0' ? "stdout" : save_file);
1671 /* Does "open_err_str" contain a non-empty string? If so, "pcap_open_live()"
1672 returned a warning; print it, but keep capturing. */
1673 if (open_err_str[0] != '\0')
1674 fprintf(stderr, "tethereal: WARNING: %s.\n", open_err_str);
1677 /* Catch a CTRL+C event and, if we get it, clean up and exit. */
1678 SetConsoleCtrlHandler(capture_cleanup, TRUE);
1680 /* Catch SIGINT and SIGTERM and, if we get either of them, clean up
1682 XXX - deal with signal semantics on various UNIX platforms. Or just
1683 use "sigaction()" and be done with it? */
1684 signal(SIGTERM, capture_cleanup);
1685 signal(SIGINT, capture_cleanup);
1686 if ((oldhandler = signal(SIGHUP, capture_cleanup)) != SIG_DFL)
1687 signal(SIGHUP, oldhandler);
1690 /* Catch SIGINFO and, if we get it and we're capturing to a file in
1691 quiet mode, report the number of packets we've captured. */
1692 signal(SIGINFO, report_counts_siginfo);
1693 #endif /* SIGINFO */
1696 /* Let the user know what interface was chosen. */
1697 descr = get_interface_descriptive_name(capture_opts.iface);
1698 fprintf(stderr, "Capturing on %s\n", descr);
1701 /* initialize capture stop conditions */
1702 init_capture_stop_conditions();
1703 /* create stop conditions */
1704 if (capture_opts.has_autostop_filesize)
1705 cnd_stop_capturesize = cnd_new((const char*)CND_CLASS_CAPTURESIZE,
1706 (long)capture_opts.autostop_filesize * 1000);
1707 if (capture_opts.has_autostop_duration)
1708 cnd_stop_timeout = cnd_new((const char*)CND_CLASS_TIMEOUT,
1709 (gint32)capture_opts.autostop_duration);
1711 if (capture_opts.multi_files_on && capture_opts.has_file_duration)
1712 cnd_ring_timeout = cnd_new(CND_CLASS_TIMEOUT,
1713 capture_opts.file_duration);
1715 if (!setjmp(ld.stopenv)) {
1717 ld.packet_count = 0;
1721 /* We need to be careful with automatic variables defined in the
1722 outer scope which are changed inside the loop. Most compilers
1723 don't try to roll them back to their original values after the
1724 longjmp which causes the loop to finish, but all that the
1725 standards say is that their values are indeterminate. If we
1726 don't want them to be rolled back, we should define them with the
1727 volatile attribute (paraphrasing W. Richard Stevens, Advanced
1728 Programming in the UNIX Environment, p. 178).
1730 The "err" variable causes a particular problem. If we give it
1731 the volatile attribute, then when we pass a reference to it (as
1732 in "&err") to a function, GCC warns: "passing arg <n> of
1733 <function> discards qualifiers from pointer target type".
1734 Therefore within the loop and just beyond we don't use "err".
1735 Within the loop we define "loop_err", and assign its value to
1736 "volatile_err", which is in the outer scope and is checked when
1739 We also define "packet_count_prev" here to keep things tidy,
1740 since it's used only inside the loop. If it were defined in the
1741 outer scope, GCC would give a warning (unnecessary in this case)
1742 that it might be clobbered, and we'd need to give it the volatile
1743 attribute to suppress the warning. */
1746 int packet_count_prev = 0;
1748 if (cnd_stop_capturesize == NULL && cnd_stop_timeout == NULL) {
1749 /* We're not stopping at a particular capture file size, and we're
1750 not stopping after some particular amount of time has expired,
1751 so either we have no stop condition or the only stop condition
1752 is a maximum packet count.
1754 If there's no maximum packet count, pass it -1, meaning "until
1755 you run out of packets in the bufferful you read". Otherwise,
1756 pass it the number of packets we have left to capture.
1758 We don't call "pcap_loop()" as, if we're saving to a file that's
1759 a FIFO, we want to flush the FIFO after we're done processing
1760 this libpcap bufferful of packets, so that the program
1761 reading the FIFO sees the packets immediately and doesn't get
1762 any partial packet, forcing it to block in the middle of reading
1764 if (capture_opts.autostop_packets == 0)
1767 if (ld.packet_count >= capture_opts.autostop_packets) {
1768 /* XXX do we need this test here? */
1769 /* It appears there's nothing more to capture. */
1772 pcap_cnt = capture_opts.autostop_packets - ld.packet_count;
1775 /* We need to check the capture file size or the timeout after
1781 inpkts = pipe_dispatch(pipe_fd, &ld, &hdr, &rechdr, pcap_data,
1782 errmsg, sizeof errmsg);
1785 inpkts = pcap_dispatch(ld.pch, pcap_cnt, capture_pcap_cb, (guchar *) &ld);
1787 /* Error from "pcap_dispatch()", or error or "no more packets" from
1788 "pipe_dispatch(). */
1790 } else if (cnd_stop_timeout != NULL && cnd_eval(cnd_stop_timeout)) {
1791 /* The specified capture time has elapsed; stop the capture. */
1793 } else if (inpkts > 0) {
1794 if (capture_opts.autostop_packets != 0 &&
1795 ld.packet_count >= capture_opts.autostop_packets) {
1796 /* The specified number of packets have been captured and have
1797 passed both any capture filter in effect and any read filter
1800 } else if (cnd_stop_capturesize != NULL &&
1801 cnd_eval(cnd_stop_capturesize,
1802 (guint32)wtap_get_bytes_dumped(ld.pdh))) {
1803 /* We're saving the capture to a file, and the capture file reached
1804 its maximum size. */
1805 if (capture_opts.multi_files_on) {
1806 /* Switch to the next ringbuffer file */
1807 if (ringbuf_switch_file(&ld.pdh, &save_file, &save_file_fd, &loop_err)) {
1808 /* File switch succeeded: reset the condition */
1809 cnd_reset(cnd_stop_capturesize);
1810 if (cnd_ring_timeout) {
1811 cnd_reset(cnd_ring_timeout);
1814 /* File switch failed: stop here */
1815 volatile_err = loop_err;
1819 /* No ringbuffer - just stop. */
1823 if (ld.output_to_pipe) {
1824 if (ld.packet_count > packet_count_prev) {
1825 if (fflush(wtap_dump_file(ld.pdh))) {
1826 volatile_err = errno;
1829 packet_count_prev = ld.packet_count;
1833 } /* while (ld.go) */
1835 /* delete stop conditions */
1836 if (cnd_stop_capturesize != NULL)
1837 cnd_delete(cnd_stop_capturesize);
1838 if (cnd_stop_timeout != NULL)
1839 cnd_delete(cnd_stop_timeout);
1840 if (cnd_ring_timeout != NULL)
1841 cnd_delete(cnd_ring_timeout);
1843 if (print_packet_counts) {
1844 /* We're printing packet counts to stderr.
1845 Send a newline so that we move to the line after the packet count. */
1846 fprintf(stderr, "\n");
1849 /* If we got an error while capturing, report it. */
1853 if (ld.pipe_err == PIPERR) {
1854 fprintf(stderr, "tethereal: Error while capturing packets: %s\n",
1860 fprintf(stderr, "tethereal: Error while capturing packets: %s\n",
1861 pcap_geterr(ld.pch));
1865 if (volatile_err == 0)
1868 show_capture_file_io_error(save_file, volatile_err, FALSE);
1872 if (save_file != NULL) {
1873 /* We're saving to a file or files; close all files. */
1874 if (capture_opts.multi_files_on) {
1875 dump_ok = ringbuf_wtap_dump_close(&save_file, &err);
1877 dump_ok = wtap_dump_close(ld.pdh, &err);
1879 /* If we've displayed a message about a write error, there's no point
1880 in displaying another message about an error on close. */
1881 if (!dump_ok && !write_err)
1882 show_capture_file_io_error(save_file, err, TRUE);
1886 if (ld.from_pipe && pipe_fd >= 0)
1891 /* Get the capture statistics, and, if any packets were dropped, report
1893 if (pcap_stats(ld.pch, &stats) >= 0) {
1894 if (stats.ps_drop != 0) {
1895 fprintf(stderr, "%u packets dropped\n", stats.ps_drop);
1898 fprintf(stderr, "tethereal: Can't get packet-drop statistics: %s\n",
1899 pcap_geterr(ld.pch));
1904 /* Report the number of captured packets if not reported during capture
1905 and we are saving to a file. */
1911 if (capture_opts.multi_files_on) {
1912 ringbuf_error_cleanup();
1916 fprintf(stderr, "tethereal: %s\n", errmsg);
1932 capture_pcap_cb(guchar *user, const struct pcap_pkthdr *phdr,
1935 struct wtap_pkthdr whdr;
1936 union wtap_pseudo_header pseudo_header;
1937 loop_data *ldat = (loop_data *) user;
1942 /* Convert from libpcap to Wiretap format.
1943 If that fails, ignore the packet (wtap_process_pcap_packet has
1944 written an error message). */
1945 pd = wtap_process_pcap_packet(ldat->linktype, phdr, pd, &pseudo_header,
1952 * Prevent a SIGINFO handler from writing to stdout while we're
1953 * doing so; instead, have it just set a flag telling us to print
1954 * that information when we're done.
1957 #endif /* SIGINFO */
1959 /* The current packet may have arrived after a very long silence,
1960 * way past the time to switch files. In order not to have
1961 * the first packet of a new series of events as the last
1962 * [or only] packet in the file, switch before writing!
1964 if (cnd_ring_timeout != NULL && cnd_eval(cnd_ring_timeout)) {
1965 /* time elapsed for this ring file, switch to the next */
1966 if (ringbuf_switch_file(&ldat->pdh, &ldat->save_file, &save_file_fd, &loop_err)) {
1967 /* File switch succeeded: reset the condition */
1968 cnd_reset(cnd_ring_timeout);
1970 /* File switch failed: stop here */
1971 /* XXX - we should do something with "loop_err" */
1976 if (!process_packet(&cfile, ldat->pdh, 0, &whdr, &pseudo_header, pd, &err)) {
1977 /* Error writing to a capture file */
1978 if (print_packet_counts) {
1979 /* We're printing counts of packets captured; move to the line after
1981 fprintf(stderr, "\n");
1983 show_capture_file_io_error(ldat->save_file, err, FALSE);
1984 pcap_close(ldat->pch);
1985 wtap_dump_close(ldat->pdh, &err);
1991 * Allow SIGINFO handlers to write.
1996 * If a SIGINFO handler asked us to write out capture counts, do so.
2000 #endif /* SIGINFO */
2005 capture_cleanup(DWORD ctrltype _U_)
2007 /* CTRL_C_EVENT is sort of like SIGINT, CTRL_BREAK_EVENT is unique to
2008 Windows, CTRL_CLOSE_EVENT is sort of like SIGHUP, CTRL_LOGOFF_EVENT
2009 is also sort of like SIGHUP, and CTRL_SHUTDOWN_EVENT is sort of
2010 like SIGTERM at least when the machine's shutting down.
2012 For now, we handle them all as indications that we should clean up
2013 and quit, just as we handle SIGINT, SIGHUP, and SIGTERM in that
2016 However, as handlers run in a new thread, we can't just longjmp
2017 out; we have to set "ld.go" to FALSE, and must return TRUE so that
2018 no other handler - such as one that would terminate the process -
2021 XXX - for some reason, typing ^C to Tethereal, if you run this in
2022 a Cygwin console window in at least some versions of Cygwin,
2023 causes Tethereal to terminate immediately; this routine gets
2024 called, but the main loop doesn't get a chance to run and
2025 exit cleanly, at least if this is compiled with Microsoft Visual
2026 C++ (i.e., it's a property of the Cygwin console window or Bash;
2027 it happens if Tethereal is not built with Cygwin - for all I know,
2028 building it with Cygwin may make the problem go away). */
2034 capture_cleanup(int signum _U_)
2036 /* Longjmp back to the starting point; "pcap_dispatch()", on many
2037 UNIX platforms, just keeps looping if it gets EINTR, so if we set
2038 "ld.go" to FALSE and return, we won't break out of it and quit
2040 longjmp(ld.stopenv, 1);
2048 /* XXX - if we use sigaction, this doesn't have to be done.
2049 (Yes, this isn't necessary on BSD, but just in case a system
2050 where "signal()" has AT&T semantics adopts SIGINFO....) */
2051 signal(SIGINFO, report_counts_siginfo);
2052 #endif /* SIGINFO */
2054 if (!print_packet_counts) {
2055 /* Report the count only if we aren't printing a packet count
2056 as packets arrive. */
2057 fprintf(stderr, "%u packets captured\n", ld.packet_count);
2060 infoprint = FALSE; /* we just reported it */
2061 #endif /* SIGINFO */
2066 report_counts_siginfo(int signum _U_)
2068 int sav_errno = errno;
2069 /* If we've been told to delay printing, just set a flag asking
2070 that we print counts (if we're supposed to), otherwise print
2071 the count of packets captured (if we're supposed to). */
2078 #endif /* SIGINFO */
2079 #endif /* HAVE_LIBPCAP */
2082 load_cap_file(capture_file *cf, char *save_file, int out_file_type)
2085 int snapshot_length;
2091 linktype = wtap_file_encap(cf->wth);
2092 if (save_file != NULL) {
2093 /* Set up to write to the capture file. */
2094 snapshot_length = wtap_snapshot_length(cf->wth);
2095 if (snapshot_length == 0) {
2096 /* Snapshot length of input file not known. */
2097 snapshot_length = WTAP_MAX_PACKET_SIZE;
2099 pdh = wtap_dump_open(save_file, out_file_type,
2100 linktype, snapshot_length, &err);
2103 /* We couldn't set up to write to the capture file. */
2106 case WTAP_ERR_UNSUPPORTED_FILE_TYPE:
2108 "tethereal: Capture files can't be written in that format.\n");
2111 case WTAP_ERR_UNSUPPORTED_ENCAP:
2112 case WTAP_ERR_ENCAP_PER_PACKET_UNSUPPORTED:
2114 "tethereal: The capture file being read can't be written in "
2118 case WTAP_ERR_CANT_OPEN:
2120 "tethereal: The file \"%s\" couldn't be created for some "
2121 "unknown reason.\n",
2122 *save_file == '\0' ? "stdout" : save_file);
2125 case WTAP_ERR_SHORT_WRITE:
2127 "tethereal: A full header couldn't be written to the file \"%s\".\n",
2128 *save_file == '\0' ? "stdout" : save_file);
2133 "tethereal: The file \"%s\" could not be created: %s\n.",
2134 *save_file == '\0' ? "stdout" : save_file,
2135 wtap_strerror(err));
2141 if (print_packet_info) {
2142 if (!write_preamble(cf)) {
2144 show_print_file_io_error(err);
2150 while (wtap_read(cf->wth, &err, &err_info, &data_offset)) {
2151 if (!process_packet(cf, pdh, data_offset, wtap_phdr(cf->wth),
2152 wtap_pseudoheader(cf->wth), wtap_buf_ptr(cf->wth),
2154 /* Error writing to a capture file */
2155 show_capture_file_io_error(save_file, err, FALSE);
2156 wtap_dump_close(pdh, &err);
2161 /* Print a message noting that the read failed somewhere along the line. */
2164 case WTAP_ERR_UNSUPPORTED_ENCAP:
2166 "tethereal: \"%s\" has a packet with a network type that Tethereal doesn't support.\n(%s)\n",
2167 cf->filename, err_info);
2170 case WTAP_ERR_CANT_READ:
2172 "tethereal: An attempt to read from \"%s\" failed for some unknown reason.\n",
2176 case WTAP_ERR_SHORT_READ:
2178 "tethereal: \"%s\" appears to have been cut short in the middle of a packet.\n",
2182 case WTAP_ERR_BAD_RECORD:
2184 "tethereal: \"%s\" appears to be damaged or corrupt.\n(%s)\n",
2185 cf->filename, err_info);
2190 "tethereal: An error occurred while reading \"%s\": %s.\n",
2191 cf->filename, wtap_strerror(err));
2194 if (save_file != NULL) {
2195 /* Now close the capture file. */
2196 if (!wtap_dump_close(pdh, &err))
2197 show_capture_file_io_error(save_file, err, TRUE);
2200 if (save_file != NULL) {
2201 /* Now close the capture file. */
2202 if (!wtap_dump_close(pdh, &err))
2203 show_capture_file_io_error(save_file, err, TRUE);
2205 if (print_packet_info) {
2206 if (!write_finale()) {
2208 show_print_file_io_error(err);
2215 wtap_close(cf->wth);
2222 fill_in_fdata(frame_data *fdata, capture_file *cf,
2223 const struct wtap_pkthdr *phdr, long offset)
2228 fdata->num = cf->count;
2229 fdata->pkt_len = phdr->len;
2230 cum_bytes += phdr->len;
2231 fdata->cum_bytes = cum_bytes;
2232 fdata->cap_len = phdr->caplen;
2233 fdata->file_off = offset;
2234 fdata->lnk_t = phdr->pkt_encap;
2235 fdata->abs_secs = phdr->ts.tv_sec;
2236 fdata->abs_usecs = phdr->ts.tv_usec;
2237 fdata->flags.passed_dfilter = 0;
2238 fdata->flags.encoding = CHAR_ASCII;
2239 fdata->flags.visited = 0;
2240 fdata->flags.marked = 0;
2241 fdata->flags.ref_time = 0;
2243 /* If we don't have the time stamp of the first packet in the
2244 capture, it's because this is the first packet. Save the time
2245 stamp of this packet as the time stamp of the first packet. */
2246 if (!firstsec && !firstusec) {
2247 firstsec = fdata->abs_secs;
2248 firstusec = fdata->abs_usecs;
2251 /* If we don't have the time stamp of the previous displayed packet,
2252 it's because this is the first displayed packet. Save the time
2253 stamp of this packet as the time stamp of the previous displayed
2255 if (!prevsec && !prevusec) {
2256 prevsec = fdata->abs_secs;
2257 prevusec = fdata->abs_usecs;
2260 /* Get the time elapsed between the first packet and this packet. */
2261 compute_timestamp_diff(&fdata->rel_secs, &fdata->rel_usecs,
2262 fdata->abs_secs, fdata->abs_usecs, firstsec, firstusec);
2264 /* If it's greater than the current elapsed time, set the elapsed time
2265 to it (we check for "greater than" so as not to be confused by
2266 time moving backwards). */
2267 if ((gint32)cf->esec < fdata->rel_secs
2268 || ((gint32)cf->esec == fdata->rel_secs && (gint32)cf->eusec < fdata->rel_usecs)) {
2269 cf->esec = fdata->rel_secs;
2270 cf->eusec = fdata->rel_usecs;
2273 /* Get the time elapsed between the previous displayed packet and
2275 compute_timestamp_diff(&fdata->del_secs, &fdata->del_usecs,
2276 fdata->abs_secs, fdata->abs_usecs, prevsec, prevusec);
2277 prevsec = fdata->abs_secs;
2278 prevusec = fdata->abs_usecs;
2281 /* Free up all data attached to a "frame_data" structure. */
2283 clear_fdata(frame_data *fdata)
2286 g_slist_free(fdata->pfd);
2290 process_packet(capture_file *cf, wtap_dumper *pdh, long offset,
2291 const struct wtap_pkthdr *whdr,
2292 union wtap_pseudo_header *pseudo_header, const guchar *pd,
2296 gboolean create_proto_tree;
2297 epan_dissect_t *edt;
2300 /* Count this packet. */
2303 /* If we're going to print packet information, or we're going to
2304 run a read filter, or we're going to process taps, set up to
2305 do a dissection and do so. */
2306 if (do_dissection) {
2307 fill_in_fdata(&fdata, cf, whdr, offset);
2309 if (print_packet_info) {
2310 /* Grab any resolved addresses */
2312 if (g_resolv_flags) {
2313 host_name_lookup_process(NULL);
2318 if (cf->rfcode || verbose || num_tap_filters!=0)
2319 create_proto_tree = TRUE;
2321 create_proto_tree = FALSE;
2322 /* The protocol tree will be "visible", i.e., printed, only if we're
2323 printing packet details, which is true if we're printing stuff
2324 ("print_packet_info" is true) and we're in verbose mode ("verbose"
2326 edt = epan_dissect_new(create_proto_tree, print_packet_info && verbose);
2328 /* If we're running a read filter, prime the epan_dissect_t with that
2331 epan_dissect_prime_dfilter(edt, cf->rfcode);
2333 tap_queue_init(edt);
2335 /* We only need the columns if we're printing packet info but we're
2336 *not* verbose; in verbose mode, we print the protocol tree, not
2337 the protocol summary. */
2338 epan_dissect_run(edt, pseudo_header, pd, &fdata,
2339 (print_packet_info && !verbose) ? &cf->cinfo : NULL);
2341 tap_push_tapped_queue(edt);
2343 /* Run the read filter if we have one. */
2345 passed = dfilter_apply_edt(cf->rfcode, edt);
2349 /* We're not running a display filter and we're not printing any
2350 packet information, so we don't need to do a dissection, and all
2351 packets are processed. */
2357 /* Count this packet. */
2362 /* Process this packet. */
2364 /* We're writing to a capture file; write this packet. */
2365 if (!wtap_dump(pdh, whdr, pseudo_header, pd, err))
2368 if (print_packet_counts) {
2369 /* We're printing packet counts. */
2370 if (ld.packet_count != 0) {
2371 fprintf(stderr, "\r%u ", ld.packet_count);
2372 /* stderr could be line buffered */
2378 if (print_packet_info) {
2379 /* We're printing packet information; print the information for
2381 print_packet(cf, edt);
2383 /* The ANSI C standard does not appear to *require* that a line-buffered
2384 stream be flushed to the host environment whenever a newline is
2385 written, it just says that, on such a stream, characters "are
2386 intended to be transmitted to or from the host environment as a
2387 block when a new-line character is encountered".
2389 The Visual C++ 6.0 C implementation doesn't do what is intended;
2390 even if you set a stream to be line-buffered, it still doesn't
2391 flush the buffer at the end of every line.
2393 So, if the "-l" flag was specified, we flush the standard output
2394 at the end of a packet. This will do the right thing if we're
2395 printing packet summary lines, and, as we print the entire protocol
2396 tree for a single packet without waiting for anything to happen,
2397 it should be as good as line-buffered mode if we're printing
2398 protocol trees. (The whole reason for the "-l" flag in either
2399 tcpdump or Tethereal is to allow the output of a live capture to
2400 be piped to a program or script and to have that script see the
2401 information for the packet as soon as it's printed, rather than
2402 having to wait until a standard I/O buffer fills up. */
2406 if (ferror(stdout)) {
2407 show_print_file_io_error(errno);
2413 if (do_dissection) {
2414 epan_dissect_free(edt);
2415 clear_fdata(&fdata);
2421 show_capture_file_io_error(const char *fname, int err, gboolean is_close)
2430 "tethereal: Not all the packets could be written to \"%s\" because there is "
2431 "no space left on the file system.\n",
2438 "tethereal: Not all the packets could be written to \"%s\" because you are "
2439 "too close to, or over your disk quota.\n",
2444 case WTAP_ERR_CANT_CLOSE:
2446 "tethereal: \"%s\" couldn't be closed for some unknown reason.\n",
2450 case WTAP_ERR_SHORT_WRITE:
2452 "tethereal: Not all the packets could be written to \"%s\".\n",
2459 "tethereal: \"%s\" could not be closed: %s.\n",
2460 fname, wtap_strerror(err));
2463 "tethereal: An error occurred while writing to \"%s\": %s.\n",
2464 fname, wtap_strerror(err));
2471 write_preamble(capture_file *cf)
2473 switch (output_action) {
2476 return print_preamble(print_stream, cf->filename);
2481 write_pdml_preamble(stdout);
2483 write_psml_preamble(stdout);
2484 return !ferror(stdout);
2487 g_assert_not_reached();
2493 get_line_buf(size_t len)
2495 static char *line_bufp = NULL;
2496 static size_t line_buf_len = 256;
2497 size_t new_line_buf_len;
2499 for (new_line_buf_len = line_buf_len; len > new_line_buf_len;
2500 new_line_buf_len *= 2)
2502 if (line_bufp == NULL) {
2503 line_buf_len = new_line_buf_len;
2504 line_bufp = g_malloc(line_buf_len + 1);
2506 if (new_line_buf_len > line_buf_len) {
2507 line_buf_len = new_line_buf_len;
2508 line_bufp = g_realloc(line_bufp, line_buf_len + 1);
2515 print_columns(capture_file *cf)
2522 line_bufp = get_line_buf(256);
2525 for (i = 0; i < cf->cinfo.num_cols; i++) {
2526 switch (cf->cinfo.col_fmt[i]) {
2530 * Don't print this if we're doing a live capture from a network
2531 * interface - if we're doing a live capture, you won't be
2532 * able to look at the capture in the future (it's not being
2533 * saved anywhere), so the frame numbers are unlikely to be
2536 * (XXX - it might be nice to be able to save and print at
2537 * the same time, sort of like an "Update list of packets
2538 * in real time" capture in Ethereal.)
2540 if (capture_opts.iface != NULL)
2543 column_len = strlen(cf->cinfo.col_data[i]);
2546 line_bufp = get_line_buf(buf_offset + column_len);
2547 sprintf(line_bufp + buf_offset, "%3s", cf->cinfo.col_data[i]);
2553 case COL_ABS_DATE_TIME: /* XXX - wider */
2554 column_len = strlen(cf->cinfo.col_data[i]);
2555 if (column_len < 10)
2557 line_bufp = get_line_buf(buf_offset + column_len);
2558 sprintf(line_bufp + buf_offset, "%10s", cf->cinfo.col_data[i]);
2564 case COL_DEF_DL_SRC:
2565 case COL_RES_DL_SRC:
2566 case COL_UNRES_DL_SRC:
2567 case COL_DEF_NET_SRC:
2568 case COL_RES_NET_SRC:
2569 case COL_UNRES_NET_SRC:
2570 column_len = strlen(cf->cinfo.col_data[i]);
2571 if (column_len < 12)
2573 line_bufp = get_line_buf(buf_offset + column_len);
2574 sprintf(line_bufp + buf_offset, "%12s", cf->cinfo.col_data[i]);
2580 case COL_DEF_DL_DST:
2581 case COL_RES_DL_DST:
2582 case COL_UNRES_DL_DST:
2583 case COL_DEF_NET_DST:
2584 case COL_RES_NET_DST:
2585 case COL_UNRES_NET_DST:
2586 column_len = strlen(cf->cinfo.col_data[i]);
2587 if (column_len < 12)
2589 line_bufp = get_line_buf(buf_offset + column_len);
2590 sprintf(line_bufp + buf_offset, "%-12s", cf->cinfo.col_data[i]);
2594 column_len = strlen(cf->cinfo.col_data[i]);
2595 line_bufp = get_line_buf(buf_offset + column_len);
2596 strcat(line_bufp + buf_offset, cf->cinfo.col_data[i]);
2599 buf_offset += column_len;
2600 if (i != cf->cinfo.num_cols - 1) {
2602 * This isn't the last column, so we need to print a
2603 * separator between this column and the next.
2605 * If we printed a network source and are printing a
2606 * network destination of the same type next, separate
2607 * them with "->"; if we printed a network destination
2608 * and are printing a network source of the same type
2609 * next, separate them with "<-"; otherwise separate them
2612 * We add enough space to the buffer for " <- " or " -> ",
2613 * even if we're only adding " ".
2615 line_bufp = get_line_buf(buf_offset + 4);
2616 switch (cf->cinfo.col_fmt[i]) {
2621 switch (cf->cinfo.col_fmt[i + 1]) {
2626 strcat(line_bufp + buf_offset, " -> ");
2631 strcat(line_bufp + buf_offset, " ");
2637 case COL_DEF_DL_SRC:
2638 case COL_RES_DL_SRC:
2639 case COL_UNRES_DL_SRC:
2640 switch (cf->cinfo.col_fmt[i + 1]) {
2642 case COL_DEF_DL_DST:
2643 case COL_RES_DL_DST:
2644 case COL_UNRES_DL_DST:
2645 strcat(line_bufp + buf_offset, " -> ");
2650 strcat(line_bufp + buf_offset, " ");
2656 case COL_DEF_NET_SRC:
2657 case COL_RES_NET_SRC:
2658 case COL_UNRES_NET_SRC:
2659 switch (cf->cinfo.col_fmt[i + 1]) {
2661 case COL_DEF_NET_DST:
2662 case COL_RES_NET_DST:
2663 case COL_UNRES_NET_DST:
2664 strcat(line_bufp + buf_offset, " -> ");
2669 strcat(line_bufp + buf_offset, " ");
2678 switch (cf->cinfo.col_fmt[i + 1]) {
2683 strcat(line_bufp + buf_offset, " <- ");
2688 strcat(line_bufp + buf_offset, " ");
2694 case COL_DEF_DL_DST:
2695 case COL_RES_DL_DST:
2696 case COL_UNRES_DL_DST:
2697 switch (cf->cinfo.col_fmt[i + 1]) {
2699 case COL_DEF_DL_SRC:
2700 case COL_RES_DL_SRC:
2701 case COL_UNRES_DL_SRC:
2702 strcat(line_bufp + buf_offset, " <- ");
2707 strcat(line_bufp + buf_offset, " ");
2713 case COL_DEF_NET_DST:
2714 case COL_RES_NET_DST:
2715 case COL_UNRES_NET_DST:
2716 switch (cf->cinfo.col_fmt[i + 1]) {
2718 case COL_DEF_NET_SRC:
2719 case COL_RES_NET_SRC:
2720 case COL_UNRES_NET_SRC:
2721 strcat(line_bufp + buf_offset, " <- ");
2726 strcat(line_bufp + buf_offset, " ");
2733 strcat(line_bufp + buf_offset, " ");
2739 return print_line(print_stream, 0, line_bufp);
2743 print_packet(capture_file *cf, epan_dissect_t *edt)
2745 print_args_t print_args;
2748 /* Print the information in the protocol tree. */
2749 switch (output_action) {
2752 print_args.to_file = TRUE;
2753 print_args.format = print_format;
2754 print_args.print_summary = !verbose;
2755 print_args.print_hex = verbose && print_hex;
2756 print_args.print_formfeed = FALSE;
2757 print_args.print_dissections = verbose ? print_dissections_expanded : print_dissections_none;
2759 /* init the packet range */
2760 packet_range_init(&print_args.range);
2762 if (!proto_tree_print(&print_args, edt, print_stream))
2765 /* "print_hex_data()" will put out a leading blank line, as well
2766 as a trailing one; print one here, to separate the packets,
2767 only if "print_hex_data()" won't be called. */
2768 if (!print_line(print_stream, 0, ""))
2774 proto_tree_write_pdml(edt, stdout);
2776 return !ferror(stdout);
2779 /* Just fill in the columns. */
2780 epan_dissect_fill_in_columns(edt);
2782 /* Now print them. */
2783 switch (output_action) {
2786 if (!print_columns(cf))
2791 proto_tree_write_psml(edt, stdout);
2792 return !ferror(stdout);
2796 if (!print_hex_data(print_stream, edt))
2798 if (!print_line(print_stream, 0, ""))
2807 switch (output_action) {
2810 return print_finale(print_stream);
2815 write_pdml_finale(stdout);
2817 write_psml_finale(stdout);
2818 return !ferror(stdout);
2821 g_assert_not_reached();
2827 show_print_file_io_error(int err)
2833 "tethereal: Not all the packets could be printed because there is "
2834 "no space left on the file system.\n");
2840 "tethereal: Not all the packets could be printed because you are "
2841 "too close to, or over your disk quota.\n");
2847 "tethereal: An error occurred while printing packets: %s.\n",
2854 cf_open_error_message(int err, gchar *err_info, gboolean for_writing,
2858 static char errmsg_errno[1024+1];
2861 /* Wiretap error. */
2864 case WTAP_ERR_NOT_REGULAR_FILE:
2865 errmsg = "The file \"%s\" is a \"special file\" or socket or other non-regular file.";
2868 case WTAP_ERR_FILE_UNKNOWN_FORMAT:
2869 /* Seen only when opening a capture file for reading. */
2870 errmsg = "The file \"%s\" isn't a capture file in a format Tethereal understands.";
2873 case WTAP_ERR_UNSUPPORTED:
2874 /* Seen only when opening a capture file for reading. */
2875 snprintf(errmsg_errno, sizeof(errmsg_errno),
2876 "The file \"%%s\" isn't a capture file in a format Tethereal understands.\n"
2879 errmsg = errmsg_errno;
2882 case WTAP_ERR_CANT_WRITE_TO_PIPE:
2883 /* Seen only when opening a capture file for writing. */
2884 snprintf(errmsg_errno, sizeof(errmsg_errno),
2885 "The file \"%%s\" is a pipe, and %s capture files can't be "
2886 "written to a pipe.", wtap_file_type_string(file_type));
2887 errmsg = errmsg_errno;
2890 case WTAP_ERR_UNSUPPORTED_FILE_TYPE:
2891 /* Seen only when opening a capture file for writing. */
2892 errmsg = "Tethereal doesn't support writing capture files in that format.";
2895 case WTAP_ERR_UNSUPPORTED_ENCAP:
2897 errmsg = "Tethereal can't save this capture in that format.";
2899 snprintf(errmsg_errno, sizeof(errmsg_errno),
2900 "The file \"%%s\" is a capture for a network type that Tethereal doesn't support.\n"
2903 errmsg = errmsg_errno;
2907 case WTAP_ERR_ENCAP_PER_PACKET_UNSUPPORTED:
2909 errmsg = "Tethereal can't save this capture in that format.";
2911 errmsg = "The file \"%s\" is a capture for a network type that Tethereal doesn't support.";
2914 case WTAP_ERR_BAD_RECORD:
2915 /* Seen only when opening a capture file for reading. */
2916 snprintf(errmsg_errno, sizeof(errmsg_errno),
2917 "The file \"%%s\" appears to be damaged or corrupt.\n"
2920 errmsg = errmsg_errno;
2923 case WTAP_ERR_CANT_OPEN:
2925 errmsg = "The file \"%s\" could not be created for some unknown reason.";
2927 errmsg = "The file \"%s\" could not be opened for some unknown reason.";
2930 case WTAP_ERR_SHORT_READ:
2931 errmsg = "The file \"%s\" appears to have been cut short"
2932 " in the middle of a packet or other data.";
2935 case WTAP_ERR_SHORT_WRITE:
2936 errmsg = "A full header couldn't be written to the file \"%s\".";
2940 snprintf(errmsg_errno, sizeof(errmsg_errno),
2941 "The file \"%%s\" could not be %s: %s.",
2942 for_writing ? "created" : "opened",
2943 wtap_strerror(err));
2944 errmsg = errmsg_errno;
2948 errmsg = file_open_error_message(err, for_writing);
2953 * Open/create errors are reported with an console message in Tethereal.
2956 open_failure_message(const char *filename, int err, gboolean for_writing)
2958 fprintf(stderr, "tethereal: ");
2959 fprintf(stderr, file_open_error_message(err, for_writing), filename);
2960 fprintf(stderr, "\n");
2964 cf_open(capture_file *cf, const char *fname, gboolean is_tempfile, int *err)
2968 char err_msg[2048+1];
2970 wth = wtap_open_offline(fname, err, &err_info, FALSE);
2974 /* The open succeeded. Fill in the information for this file. */
2976 /* Initialize all data structures used for dissection. */
2980 cf->filed = -1; /* not used, but set it anyway */
2981 cf->f_len = 0; /* not used, but set it anyway */
2983 /* Set the file name because we need it to set the follow stream filter.
2984 XXX - is that still true? We need it for other reasons, though,
2986 cf->filename = g_strdup(fname);
2988 /* Indicate whether it's a permanent or temporary file. */
2989 cf->is_tempfile = is_tempfile;
2991 /* If it's a temporary capture buffer file, mark it as not saved. */
2992 cf->user_saved = !is_tempfile;
2994 cf->cd_t = wtap_file_type(cf->wth);
2996 cf->drops_known = FALSE;
3000 cf->snap = wtap_snapshot_length(cf->wth);
3001 if (cf->snap == 0) {
3002 /* Snapshot length not known. */
3003 cf->has_snap = FALSE;
3004 cf->snap = WTAP_MAX_PACKET_SIZE;
3006 cf->has_snap = TRUE;
3007 firstsec = 0, firstusec = 0;
3008 prevsec = 0, prevusec = 0;
3013 snprintf(err_msg, sizeof err_msg,
3014 cf_open_error_message(*err, err_info, FALSE, 0), fname);
3015 fprintf(stderr, "tethereal: %s\n", err_msg);
3021 /* Take care of byte order in the libpcap headers read from pipes.
3022 * (function taken from wiretap/libpcap.c) */
3024 adjust_header(loop_data *ldat, struct pcap_hdr *hdr, struct pcaprec_hdr *rechdr)
3026 if (ldat->byte_swapped) {
3027 /* Byte-swap the record header fields. */
3028 rechdr->ts_sec = BSWAP32(rechdr->ts_sec);
3029 rechdr->ts_usec = BSWAP32(rechdr->ts_usec);
3030 rechdr->incl_len = BSWAP32(rechdr->incl_len);
3031 rechdr->orig_len = BSWAP32(rechdr->orig_len);
3034 /* In file format version 2.3, the "incl_len" and "orig_len" fields were
3035 swapped, in order to match the BPF header layout.
3037 Unfortunately, some files were, according to a comment in the "libpcap"
3038 source, written with version 2.3 in their headers but without the
3039 interchanged fields, so if "incl_len" is greater than "orig_len" - which
3040 would make no sense - we assume that we need to swap them. */
3041 if (hdr->version_major == 2 &&
3042 (hdr->version_minor < 3 ||
3043 (hdr->version_minor == 3 && rechdr->incl_len > rechdr->orig_len))) {
3046 temp = rechdr->orig_len;
3047 rechdr->orig_len = rechdr->incl_len;
3048 rechdr->incl_len = temp;
3052 /* Mimic pcap_open_live() for pipe captures
3053 * We check if "pipename" is "-" (stdin) or a FIFO, open it, and read the
3055 * N.B. : we can't read the libpcap formats used in RedHat 6.1 or SuSE 6.3
3056 * because we can't seek on pipes (see wiretap/libpcap.c for details) */
3058 pipe_open_live(char *pipename, struct pcap_hdr *hdr, loop_data *ldat,
3059 char *errmsg, int errmsgl)
3061 struct stat pipe_stat;
3065 unsigned int bytes_read;
3068 * XXX Tethereal blocks until we return
3070 if (strcmp(pipename, "-") == 0)
3071 fd = 0; /* read from stdin */
3073 if (stat(pipename, &pipe_stat) < 0) {
3074 if (errno == ENOENT || errno == ENOTDIR)
3075 ldat->pipe_err = PIPNEXIST;
3077 snprintf(errmsg, errmsgl,
3078 "The capture session could not be initiated "
3079 "due to error on pipe: %s", strerror(errno));
3080 ldat->pipe_err = PIPERR;
3084 if (! S_ISFIFO(pipe_stat.st_mode)) {
3085 if (S_ISCHR(pipe_stat.st_mode)) {
3087 * Assume the user specified an interface on a system where
3088 * interfaces are in /dev. Pretend we haven't seen it.
3090 ldat->pipe_err = PIPNEXIST;
3092 snprintf(errmsg, errmsgl,
3093 "The capture session could not be initiated because\n"
3094 "\"%s\" is neither an interface nor a pipe", pipename);
3095 ldat->pipe_err = PIPERR;
3099 fd = open(pipename, O_RDONLY);
3101 snprintf(errmsg, errmsgl,
3102 "The capture session could not be initiated "
3103 "due to error on pipe open: %s", strerror(errno));
3104 ldat->pipe_err = PIPERR;
3109 ldat->from_pipe = TRUE;
3111 /* read the pcap header */
3113 while (bytes_read < sizeof magic) {
3114 b = read(fd, ((char *)&magic)+bytes_read, sizeof magic-bytes_read);
3117 snprintf(errmsg, errmsgl, "End of file on pipe during open");
3119 snprintf(errmsg, errmsgl, "Error on pipe during open: %s",
3128 /* Host that wrote it has our byte order, and was running
3129 a program using either standard or ss990417 libpcap. */
3130 ldat->byte_swapped = FALSE;
3131 ldat->modified = FALSE;
3133 case PCAP_MODIFIED_MAGIC:
3134 /* Host that wrote it has our byte order, but was running
3135 a program using either ss990915 or ss991029 libpcap. */
3136 ldat->byte_swapped = FALSE;
3137 ldat->modified = TRUE;
3139 case PCAP_SWAPPED_MAGIC:
3140 /* Host that wrote it has a byte order opposite to ours,
3141 and was running a program using either standard or
3142 ss990417 libpcap. */
3143 ldat->byte_swapped = TRUE;
3144 ldat->modified = FALSE;
3146 case PCAP_SWAPPED_MODIFIED_MAGIC:
3147 /* Host that wrote it out has a byte order opposite to
3148 ours, and was running a program using either ss990915
3149 or ss991029 libpcap. */
3150 ldat->byte_swapped = TRUE;
3151 ldat->modified = TRUE;
3154 /* Not a "libpcap" type we know about. */
3155 snprintf(errmsg, errmsgl, "Unrecognized libpcap format");
3159 /* Read the rest of the header */
3161 while (bytes_read < sizeof(struct pcap_hdr)) {
3162 b = read(fd, ((char *)hdr)+bytes_read,
3163 sizeof(struct pcap_hdr) - bytes_read);
3166 snprintf(errmsg, errmsgl, "End of file on pipe during open");
3168 snprintf(errmsg, errmsgl, "Error on pipe during open: %s",
3175 if (ldat->byte_swapped) {
3176 /* Byte-swap the header fields about which we care. */
3177 hdr->version_major = BSWAP16(hdr->version_major);
3178 hdr->version_minor = BSWAP16(hdr->version_minor);
3179 hdr->snaplen = BSWAP32(hdr->snaplen);
3180 hdr->network = BSWAP32(hdr->network);
3183 if (hdr->version_major < 2) {
3184 snprintf(errmsg, errmsgl, "Unable to read old libpcap format");
3188 ldat->pipe_state = STATE_EXPECT_REC_HDR;
3189 ldat->pipe_err = PIPOK;
3193 ldat->pipe_err = PIPERR;
3198 /* We read one record from the pipe, take care of byte order in the record
3199 * header, write the record in the capture file, and update capture statistics. */
3202 pipe_dispatch(int fd, loop_data *ldat, struct pcap_hdr *hdr,
3203 struct pcaprec_modified_hdr *rechdr, guchar *data,
3204 char *errmsg, int errmsgl)
3206 struct pcap_pkthdr phdr;
3208 enum { PD_REC_HDR_READ, PD_DATA_READ, PD_PIPE_EOF, PD_PIPE_ERR,
3211 switch (ldat->pipe_state) {
3213 case STATE_EXPECT_REC_HDR:
3214 ldat->bytes_to_read = ldat->modified ?
3215 sizeof(struct pcaprec_modified_hdr) : sizeof(struct pcaprec_hdr);
3216 ldat->bytes_read = 0;
3217 ldat->pipe_state = STATE_READ_REC_HDR;
3220 case STATE_READ_REC_HDR:
3221 b = read(fd, ((char *)rechdr)+ldat->bytes_read,
3222 ldat->bytes_to_read - ldat->bytes_read);
3225 result = PD_PIPE_EOF;
3227 result = PD_PIPE_ERR;
3230 if ((ldat->bytes_read += b) < ldat->bytes_to_read)
3232 result = PD_REC_HDR_READ;
3235 case STATE_EXPECT_DATA:
3236 ldat->bytes_read = 0;
3237 ldat->pipe_state = STATE_READ_DATA;
3240 case STATE_READ_DATA:
3241 b = read(fd, data+ldat->bytes_read, rechdr->hdr.incl_len - ldat->bytes_read);
3244 result = PD_PIPE_EOF;
3246 result = PD_PIPE_ERR;
3249 if ((ldat->bytes_read += b) < rechdr->hdr.incl_len)
3251 result = PD_DATA_READ;
3255 snprintf(errmsg, errmsgl, "pipe_dispatch: invalid state");
3258 } /* switch (ldat->pipe_state) */
3261 * We've now read as much data as we were expecting, so process it.
3265 case PD_REC_HDR_READ:
3266 /* We've read the header. Take care of byte order. */
3267 adjust_header(ldat, hdr, &rechdr->hdr);
3268 if (rechdr->hdr.incl_len > WTAP_MAX_PACKET_SIZE) {
3269 snprintf(errmsg, errmsgl, "Frame %u too long (%d bytes)",
3270 ldat->packet_count+1, rechdr->hdr.incl_len);
3273 ldat->pipe_state = STATE_EXPECT_DATA;
3277 /* Fill in a "struct pcap_pkthdr", and process the packet. */
3278 phdr.ts.tv_sec = rechdr->hdr.ts_sec;
3279 phdr.ts.tv_usec = rechdr->hdr.ts_usec;
3280 phdr.caplen = rechdr->hdr.incl_len;
3281 phdr.len = rechdr->hdr.orig_len;
3283 capture_pcap_cb((guchar *)ldat, &phdr, data);
3285 ldat->pipe_state = STATE_EXPECT_REC_HDR;
3289 ldat->pipe_err = PIPEOF;
3293 snprintf(errmsg, errmsgl, "Error reading from pipe: %s",
3300 ldat->pipe_err = PIPERR;
3301 /* Return here rather than inside the switch to prevent GCC warning */
3305 #endif /* HAVE_LIBPCAP */
3308 * General errors are reported with an console message in Tethereal.
3311 failure_message(const char *msg_format, va_list ap)
3313 fprintf(stderr, "tethereal: ");
3314 vfprintf(stderr, msg_format, ap);
3315 fprintf(stderr, "\n");
3319 * Read errors are reported with an console message in Tethereal.
3322 read_failure_message(const char *filename, int err)
3324 fprintf(stderr, "tethereal: An error occurred while reading from the file \"%s\": %s.\n",
3325 filename, strerror(err));