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.
55 #ifdef HAVE_SYS_STAT_H
56 # include <sys/stat.h>
59 #ifdef NEED_SNPRINTF_H
60 # include "snprintf.h"
63 #ifdef NEED_STRERROR_H
71 #include "svnversion.h"
74 #include <epan/epan.h>
75 #include <epan/filesystem.h>
78 #include <epan/timestamp.h>
79 #include <epan/packet.h>
81 #include "disabled_protos.h"
82 #include <epan/prefs.h>
83 #include <epan/column.h>
85 #include <epan/addr_resolv.h>
87 #include "clopts_common.h"
88 #include "version_info.h"
90 #include "pcap-util.h"
92 #include <epan/conversation.h>
93 #include <epan/plugins.h>
95 #include "conditions.h"
96 #include "capture_stop_conditions.h"
97 #include "ringbuffer.h"
98 #include "capture_ui_utils.h"
99 #include <epan/epan_dissect.h>
100 #include <epan/tap.h>
101 #include <epan/timestamp.h>
104 #include <wiretap/wtap-capture.h>
105 #include <wiretap/libpcap.h>
107 #include "capture-wpcap.h"
114 * This is the template for the decode as option; it is shared between the
115 * various functions that output the usage for this parameter.
117 static const gchar decode_as_arg_template[] = "<layer_type>==<selector>,<decode_as_protocol>";
119 static guint32 firstsec, firstusec;
120 static guint32 prevsec, prevusec;
121 static GString *comp_info_str, *runtime_info_str;
123 static gboolean print_packet_info; /* TRUE if we're to print packet information */
125 * The way the packet decode is to be written.
128 WRITE_TEXT, /* summary or detail text */
129 WRITE_XML /* PDML or PSML */
130 /* Add CSV and the like here */
132 static output_action_e output_action;
133 static gboolean do_dissection; /* TRUE if we have to dissect each packet */
134 static gboolean verbose;
135 static gboolean print_hex;
136 static gboolean line_buffered;
137 static guint32 cum_bytes = 0;
138 static print_format_e print_format = PR_FMT_TEXT;
139 static print_stream_t *print_stream;
143 * TRUE if we're to print packet counts to keep track of captured packets.
145 static gboolean print_packet_counts;
147 typedef struct _loop_data {
148 gboolean go; /* TRUE as long as we're supposed to keep capturing */
150 gboolean from_pipe; /* TRUE if we are capturing data from a pipe */
152 char *save_file; /* Name of file to which we're writing */
155 gboolean output_to_pipe;
158 gboolean modified; /* TRUE if data in the pipe uses modified pcap headers */
159 gboolean byte_swapped; /* TRUE if data in the pipe is byte swapped */
160 unsigned int bytes_to_read, bytes_read; /* Used by pipe_dispatch */
162 STATE_EXPECT_REC_HDR, STATE_READ_REC_HDR,
163 STATE_EXPECT_DATA, STATE_READ_DATA
165 enum { PIPOK, PIPEOF, PIPERR, PIPNEXIST } pipe_err;
172 static capture_options capture_opts;
176 static gboolean infodelay; /* if TRUE, don't print capture info in SIGINFO handler */
177 static gboolean infoprint; /* if TRUE, print capture info after clearing infodelay */
179 #endif /* HAVE_LIBPCAP */
182 static int capture(char *, int);
183 static void capture_pcap_cb(guchar *, const struct pcap_pkthdr *,
185 static void report_counts(void);
187 static BOOL WINAPI capture_cleanup(DWORD);
189 static void capture_cleanup(int);
191 static void report_counts_siginfo(int);
194 #endif /* HAVE_LIBPCAP */
196 static int load_cap_file(capture_file *, char *, int);
197 static gboolean process_packet(capture_file *cf, wtap_dumper *pdh, long offset,
198 const struct wtap_pkthdr *whdr, union wtap_pseudo_header *pseudo_header,
199 const guchar *pd, int *err);
200 static void show_capture_file_io_error(const char *, int, gboolean);
201 static void show_print_file_io_error(int err);
202 static gboolean write_preamble(capture_file *cf);
203 static gboolean print_packet(capture_file *cf, epan_dissect_t *edt);
204 static gboolean write_finale(void);
205 static char *cf_open_error_message(int err, gchar *err_info,
206 gboolean for_writing, int file_type);
209 static void adjust_header(loop_data *, struct pcap_hdr *, struct pcaprec_hdr *);
210 static int pipe_open_live(char *, struct pcap_hdr *, loop_data *, char *, int);
211 static int pipe_dispatch(int, loop_data *, struct pcap_hdr *, \
212 struct pcaprec_modified_hdr *, guchar *, char *, int);
216 static void open_failure_message(const char *filename, int err,
217 gboolean for_writing);
218 static void failure_message(const char *msg_format, va_list ap);
219 static void read_failure_message(const char *filename, int err);
225 print_usage(gboolean print_ver)
232 fprintf(output, "This is GNU t" PACKAGE " " VERSION
236 "\n (C) 1998-2004 Gerald Combs <gerald@ethereal.com>"
239 comp_info_str->str, runtime_info_str->str);
244 fprintf(output, "\nt%s [ -vh ] [ -DlLnpqSVx ] [ -a <capture autostop condition> ] ...\n",
246 fprintf(output, "\t[ -b <number of ring buffer files>[:<duration>] ] [ -c <count> ]\n");
247 fprintf(output, "\t[ -d %s ] ...\n", decode_as_arg_template);
248 fprintf(output, "\t[ -f <capture filter> ] [ -F <output file type> ] [ -i <interface> ]\n");
249 fprintf(output, "\t[ -N <resolving> ] [ -o <preference setting> ] ... [ -r <infile> ]\n");
250 fprintf(output, "\t[ -R <read filter> ] [ -s <snaplen> ] [ -t <time stamp format> ]\n");
251 fprintf(output, "\t[ -T pdml|ps|psml|text ] [ -w <savefile> ] [ -y <link type> ]\n");
252 fprintf(output, "\t[ -z <statistics string> ]\n");
254 fprintf(output, "\nt%s [ -vh ] [ -lnVx ]\n", PACKAGE);
255 fprintf(output, "\t[ -d %s ] ...\n", decode_as_arg_template);
256 fprintf(output, "\t[ -F <output file type> ] [ -N <resolving> ]\n");
257 fprintf(output, "\t[ -o <preference setting> ] ... [ -r <infile> ] [ -R <read filter> ]\n");
258 fprintf(output, "\t[ -t <time stamp format> ] [ -T pdml|ps|psml|text ] [ -w <savefile> ]\n");
259 fprintf(output, "\t[ -z <statistics string> ]\n");
261 fprintf(output, "Valid file type arguments to the \"-F\" flag:\n");
262 for (i = 0; i < WTAP_NUM_FILE_TYPES; i++) {
263 if (wtap_dump_can_open(i))
264 fprintf(output, "\t%s - %s\n",
265 wtap_file_type_short_string(i), wtap_file_type_string(i));
267 fprintf(output, "\tdefault is libpcap\n");
270 /* structure to keep track of what tap listeners have been registered.
272 typedef struct _ethereal_tap_list {
273 struct _ethereal_tap_list *next;
275 void (*func)(char *arg);
277 static ethereal_tap_list *tap_list=NULL;
280 register_ethereal_tap(char *cmd, void (*func)(char *arg))
282 ethereal_tap_list *newtl;
284 newtl=malloc(sizeof(ethereal_tap_list));
285 newtl->next=tap_list;
293 * For a dissector table, print on the stream described by output,
294 * its short name (which is what's used in the "-d" option) and its
298 display_dissector_table_names(char *table_name, char *ui_name, gpointer output)
300 fprintf((FILE *)output, "\t%s (%s)\n", table_name, ui_name);
304 * For a dissector handle, print on the stream described by output,
305 * the filter name (which is what's used in the "-d" option) and the full
306 * name for the protocol that corresponds to this handle.
309 display_dissector_names(gchar *table _U_, gpointer handle, gpointer output)
312 const gchar* proto_filter_name;
313 const gchar* proto_ui_name;
315 proto_id = dissector_handle_get_protocol_index((dissector_handle_t)handle);
317 if (proto_id != -1) {
318 proto_filter_name = proto_get_protocol_filter_name(proto_id);
319 proto_ui_name = proto_get_protocol_name(proto_id);
320 g_assert(proto_filter_name != NULL);
321 g_assert(proto_ui_name != NULL);
323 fprintf((FILE *)output, "\t%s (%s)\n",
330 * The protocol_name_search structure is used by find_protocol_name_func()
331 * to pass parameters and store results
333 struct protocol_name_search{
334 gchar *searched_name; /* Protocol filter name we are looking for */
335 dissector_handle_t matched_handle; /* Handle for a dissector whose protocol has the specified filter name */
336 guint nb_match; /* How many dissectors matched searched_name */
338 typedef struct protocol_name_search *protocol_name_search_t;
341 * This function parses all dissectors associated with a table to find the
342 * one whose protocol has the specified filter name. It is called
343 * as a reference function in a call to dissector_table_foreach_handle.
344 * The name we are looking for, as well as the results, are stored in the
345 * protocol_name_search struct pointed to by user_data.
346 * If called using dissector_table_foreach_handle, we actually parse the
347 * whole list of dissectors.
350 find_protocol_name_func(gchar *table _U_, gpointer handle, gpointer user_data)
354 const gchar *protocol_filter_name;
355 protocol_name_search_t search_info;
359 search_info = (protocol_name_search_t)user_data;
361 proto_id = dissector_handle_get_protocol_index((dissector_handle_t)handle);
362 if (proto_id != -1) {
363 protocol_filter_name = proto_get_protocol_filter_name(proto_id);
364 g_assert(protocol_filter_name != NULL);
365 if (strcmp(protocol_filter_name, search_info->searched_name) == 0) {
367 if (search_info->nb_match == 0) {
368 /* Record this handle only if this is the first match */
369 search_info->matched_handle = (dissector_handle_t)handle; /* Record the handle for this matching dissector */
371 search_info->nb_match++;
377 * Print all layer type names supported.
378 * We send the output to the stream described by the handle output.
382 fprint_all_layer_types(FILE *output)
385 dissector_all_tables_foreach_table(display_dissector_table_names, (gpointer)output);
389 * Print all protocol names supported for a specific layer type.
390 * table_name contains the layer type name in which the search is performed.
391 * We send the output to the stream described by the handle output.
395 fprint_all_protocols_for_layer_types(FILE *output, gchar *table_name)
398 dissector_table_foreach_handle(table_name,
399 display_dissector_names,
404 * The function below parses the command-line parameters for the decode as
405 * feature (a string pointer by cl_param).
406 * It checks the format of the command-line, searches for a matching table
407 * and dissector. If a table/dissector match is not found, we display a
408 * summary of the available tables/dissectors (on stderr) and return FALSE.
409 * If everything is fine, we get the "Decode as" preference activated,
410 * then we return TRUE.
413 add_decode_as(const gchar *cl_param)
417 gchar *decoded_param;
418 gchar *remaining_param;
420 gchar *dissector_str;
421 dissector_handle_t dissector_matching;
422 dissector_table_t table_matching;
423 ftenum_t dissector_table_selector_type;
424 struct protocol_name_search user_protocol_name;
426 /* The following code will allocate and copy the command-line options in a string pointed by decoded_param */
429 decoded_param = g_malloc( sizeof(gchar) * (strlen(cl_param) + 1) ); /* Allocate enough space to have a working copy of the command-line parameter */
430 g_assert(decoded_param);
431 strcpy(decoded_param, cl_param);
434 /* The lines below will parse this string (modifying it) to extract all
435 necessary information. Note that decoded_param is still needed since
436 strings are not copied - we just save pointers. */
438 /* This section extracts a layer type (table_name) from decoded_param */
439 table_name = decoded_param; /* Layer type string starts from beginning */
441 remaining_param = strchr(table_name, '=');
442 if (remaining_param == NULL) {
443 fprintf(stderr, "tethereal: Parameter \"%s\" doesn't follow the template \"%s\"\n", cl_param, decode_as_arg_template);
444 /* If the argument does not follow the template, carry on anyway to check
445 if the table name is at least correct. If remaining_param is NULL,
446 we'll exit anyway further down */
449 *remaining_param = '\0'; /* Terminate the layer type string (table_name) where '=' was detected */
452 /* Remove leading and trailing spaces from the table name */
453 while ( table_name[0] == ' ' )
455 while ( table_name[strlen(table_name) - 1] == ' ' )
456 table_name[strlen(table_name) - 1] = '\0'; /* Note: if empty string, while loop will eventually exit */
458 /* The following part searches a table matching with the layer type specified */
459 table_matching = NULL;
461 /* Look for the requested table */
462 if ( !(*(table_name)) ) { /* Is the table name empty, if so, don't even search for anything, display a message */
463 fprintf(stderr, "tethereal: No layer type specified\n"); /* Note, we don't exit here, but table_matching will remain NULL, so we exit below */
466 table_matching = find_dissector_table(table_name);
467 if (!table_matching) {
468 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 */
472 if (!table_matching) {
473 /* Display a list of supported layer types to help the user, if the
474 specified layer type was not found */
475 fprintf(stderr, "tethereal: Valid layer types are:\n");
476 fprint_all_layer_types(stderr);
478 if (remaining_param == NULL || !table_matching) {
479 /* Exit if the layer type was not found, or if no '=' separator was found
481 g_free(decoded_param);
485 if (*(remaining_param + 1) != '=') { /* Check for "==" and not only '=' */
486 fprintf(stderr, "tethereal: WARNING: -d requires \"==\" instead of \"=\". Option will be treated as \"%s==%s\"\n", table_name, remaining_param + 1);
489 remaining_param++; /* Move to the second '=' */
490 *remaining_param = '\0'; /* Remove the second '=' */
492 remaining_param++; /* Position after the layer type string */
494 /* This section extracts a selector value (selector_str) from decoded_param */
496 selector_str = remaining_param; /* Next part starts with the selector number */
498 remaining_param = strchr(selector_str, ',');
499 if (remaining_param == NULL) {
500 fprintf(stderr, "tethereal: Parameter \"%s\" doesn't follow the template \"%s\"\n", cl_param, decode_as_arg_template);
501 /* If the argument does not follow the template, carry on anyway to check
502 if the selector value is at least correct. If remaining_param is NULL,
503 we'll exit anyway further down */
506 *remaining_param = '\0'; /* Terminate the selector number string (selector_str) where ',' was detected */
509 dissector_table_selector_type = get_dissector_table_selector_type(table_name);
511 switch (dissector_table_selector_type) {
517 /* The selector for this table is an unsigned number. Parse it as such.
518 There's no need to remove leading and trailing spaces from the
519 selector number string, because sscanf will do that for us. */
520 if ( sscanf(selector_str, "%u", &selector) != 1 ) {
521 fprintf(stderr, "tethereal: Invalid selector number \"%s\"\n", selector_str);
522 g_free(decoded_param);
529 /* The selector for this table is a string. */
533 /* There are currently no dissector tables with any types other
534 than the ones listed above. */
535 g_assert_not_reached();
538 if (remaining_param == NULL) {
539 /* Exit if no ',' separator was found (see above) */
540 fprintf(stderr, "tethereal: Valid protocols for layer type \"%s\" are:\n", table_name);
541 fprint_all_protocols_for_layer_types(stderr, table_name);
542 g_free(decoded_param);
546 remaining_param++; /* Position after the selector number string */
548 /* This section extracts a protocol filter name (dissector_str) from decoded_param */
550 dissector_str = remaining_param; /* All the rest of the string is the dissector (decode as protocol) name */
552 /* Remove leading and trailing spaces from the dissector name */
553 while ( dissector_str[0] == ' ' )
555 while ( dissector_str[strlen(dissector_str) - 1] == ' ' )
556 dissector_str[strlen(dissector_str) - 1] = '\0'; /* Note: if empty string, while loop will eventually exit */
558 dissector_matching = NULL;
560 /* We now have a pointer to the handle for the requested table inside the variable table_matching */
561 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 */
562 fprintf(stderr, "tethereal: No protocol name specified\n"); /* Note, we don't exit here, but dissector_matching will remain NULL, so we exit below */
565 user_protocol_name.nb_match = 0;
566 user_protocol_name.searched_name = dissector_str;
567 user_protocol_name.matched_handle = NULL;
569 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 */
571 if (user_protocol_name.nb_match != 0) {
572 dissector_matching = user_protocol_name.matched_handle;
573 if (user_protocol_name.nb_match > 1) {
574 fprintf(stderr, "tethereal: WARNING: Protocol \"%s\" matched %u dissectors, first one will be used\n", dissector_str, user_protocol_name.nb_match);
578 /* OK, check whether the problem is that there isn't any such
579 protocol, or that there is but it's not specified as a protocol
580 that's valid for that dissector table.
581 Note, we don't exit here, but dissector_matching will remain NULL,
583 if (proto_get_id_by_filter_name(dissector_str) == -1) {
584 /* No such protocol */
585 fprintf(stderr, "tethereal: Unknown protocol -- \"%s\"\n", dissector_str);
587 fprintf(stderr, "tethereal: Protocol \"%s\" isn't valid for layer type \"%s\"\n",
588 dissector_str, table_name);
593 if (!dissector_matching) {
594 fprintf(stderr, "tethereal: Valid protocols for layer type \"%s\" are:\n", table_name);
595 fprint_all_protocols_for_layer_types(stderr, table_name);
596 g_free(decoded_param);
600 /* This is the end of the code that parses the command-line options.
601 All information is now stored in the variables:
605 The above variables that are strings are still pointing to areas within
606 decoded_parm. decoded_parm thus still needs to be kept allocated in
607 until we stop needing these variables
608 decoded_param will be deallocated at each exit point of this function */
611 /* We now have a pointer to the handle for the requested dissector
612 (requested protocol) inside the variable dissector_matching */
613 switch (dissector_table_selector_type) {
619 /* The selector for this table is an unsigned number. */
620 dissector_change(table_name, selector, dissector_matching);
625 /* The selector for this table is a string. */
626 dissector_change_string(table_name, selector_str, dissector_matching);
630 /* There are currently no dissector tables with any types other
631 than the ones listed above. */
632 g_assert_not_reached();
634 g_free(decoded_param); /* "Decode As" rule has been succesfully added */
639 main(int argc, char *argv[])
643 gboolean arg_error = FALSE;
649 char *gpf_path, *pf_path;
650 char *gdp_path, *dp_path;
651 int gpf_open_errno, gpf_read_errno;
652 int pf_open_errno, pf_read_errno;
653 int gdp_open_errno, gdp_read_errno;
654 int dp_open_errno, dp_read_errno;
657 gboolean capture_filter_specified = FALSE;
658 GList *if_list, *if_entry;
662 gchar err_str[PCAP_ERRBUF_SIZE];
663 gchar *cant_get_if_list_errstr;
664 gboolean list_link_layer_types = FALSE;
666 gboolean capture_option_specified = FALSE;
668 gboolean quiet = FALSE;
669 gchar *save_file = NULL;
670 int out_file_type = WTAP_FILE_PCAP;
671 gchar *cf_name = NULL, *rfilter = NULL;
673 gboolean start_capture = FALSE;
675 GList *lt_list, *lt_entry;
676 data_link_info_t *data_link_info;
678 #ifdef HAVE_PCAP_OPEN_DEAD
679 struct bpf_program fcode;
681 dfilter_t *rfcode = NULL;
684 ethereal_tap_list *tli = NULL;
685 guint8* tli_optarg = NULL;
688 capture_opts_init(&capture_opts, NULL /* cfile */);
691 set_timestamp_setting(TS_RELATIVE);
693 /* Register all dissectors; we must do this before checking for the
694 "-G" flag, as the "-G" flag dumps information registered by the
695 dissectors, and we must do it before we read the preferences, in
696 case any dissectors register preferences. */
697 epan_init(PLUGIN_DIR,register_all_protocols,register_all_protocol_handoffs,
698 failure_message,open_failure_message,read_failure_message);
700 /* Register all tap listeners; we do this before we parse the arguments,
701 as the "-z" argument can specify a registered tap. */
703 /* we register the plugin taps before the other taps because
704 stats_tree taps plugins will be registered as tap listeners
705 by stats_tree_stat.c and need to registered before that */
706 register_all_plugin_tap_listeners();
707 register_all_tap_listeners();
709 /* Now register the preferences for any non-dissector modules.
710 We must do that before we read the preferences as well. */
711 prefs_register_modules();
713 /* If invoked with the "-G" flag, we dump out information based on
714 the argument to the "-G" flag; if no argument is specified,
715 for backwards compatibility we dump out a glossary of display
718 We do this here to mirror what happens in the GTK+ version, although
719 it's not necessary here. */
720 handle_dashG_option(argc, argv, "tethereal");
722 /* Set the C-language locale to the native environment. */
723 setlocale(LC_ALL, "");
725 prefs = read_prefs(&gpf_open_errno, &gpf_read_errno, &gpf_path,
726 &pf_open_errno, &pf_read_errno, &pf_path);
727 if (gpf_path != NULL) {
728 if (gpf_open_errno != 0) {
729 fprintf(stderr, "Can't open global preferences file \"%s\": %s.\n",
730 pf_path, strerror(gpf_open_errno));
732 if (gpf_read_errno != 0) {
733 fprintf(stderr, "I/O error reading global preferences file \"%s\": %s.\n",
734 pf_path, strerror(gpf_read_errno));
737 if (pf_path != NULL) {
738 if (pf_open_errno != 0) {
739 fprintf(stderr, "Can't open your preferences file \"%s\": %s.\n", pf_path,
740 strerror(pf_open_errno));
742 if (pf_read_errno != 0) {
743 fprintf(stderr, "I/O error reading your preferences file \"%s\": %s.\n",
744 pf_path, strerror(pf_read_errno));
750 /* Set the name resolution code's flags from the preferences. */
751 g_resolv_flags = prefs->name_resolve;
753 /* Read the disabled protocols file. */
754 read_disabled_protos_list(&gdp_path, &gdp_open_errno, &gdp_read_errno,
755 &dp_path, &dp_open_errno, &dp_read_errno);
756 if (gdp_path != NULL) {
757 if (gdp_open_errno != 0) {
759 "Could not open global disabled protocols file\n\"%s\": %s.\n",
760 gdp_path, strerror(gdp_open_errno));
762 if (gdp_read_errno != 0) {
764 "I/O error reading global disabled protocols file\n\"%s\": %s.\n",
765 gdp_path, strerror(gdp_read_errno));
769 if (dp_path != NULL) {
770 if (dp_open_errno != 0) {
772 "Could not open your disabled protocols file\n\"%s\": %s.\n", dp_path,
773 strerror(dp_open_errno));
775 if (dp_read_errno != 0) {
777 "I/O error reading your disabled protocols file\n\"%s\": %s.\n", dp_path,
778 strerror(dp_read_errno));
784 /* Load Wpcap, if possible */
788 init_cap_file(&cfile);
790 /* Assemble the compile-time version information string */
791 comp_info_str = g_string_new("Compiled ");
792 get_compiled_version_info(comp_info_str);
794 /* Assemble the run-time version information string */
795 runtime_info_str = g_string_new("Running ");
796 get_runtime_version_info(runtime_info_str);
798 /* Print format defaults to this. */
799 print_format = PR_FMT_TEXT;
801 /* Now get our args */
802 while ((opt = getopt(argc, argv, "a:b:c:d:Df:F:hi:lLnN:o:pqr:R:s:St:T:vw:Vxy:z:")) != -1) {
804 case 'a': /* autostop criteria */
805 case 'b': /* Ringbuffer option */
806 case 'c': /* Capture xxx packets */
807 case 'f': /* capture filter */
808 case 'p': /* Don't capture in promiscuous mode */
809 case 's': /* Set the snapshot (capture) length */
810 case 'y': /* Set the pcap data link type */
812 capture_opts_add_opt(&capture_opts, "tethereal", opt, optarg, &start_capture);
814 capture_option_specified = TRUE;
818 case 'd': /* Decode as rule */
819 if (!add_decode_as(optarg))
822 case 'D': /* Print a list of capture devices */
824 if_list = get_interface_list(&err, err_str);
825 if (if_list == NULL) {
828 case CANT_GET_INTERFACE_LIST:
829 cant_get_if_list_errstr =
830 cant_get_if_list_error_message(err_str);
831 fprintf(stderr, "tethereal: %s\n", cant_get_if_list_errstr);
832 g_free(cant_get_if_list_errstr);
835 case NO_INTERFACES_FOUND:
836 fprintf(stderr, "tethereal: There are no interfaces on which a capture can be done\n");
841 i = 1; /* Interface id number */
842 for (if_entry = g_list_first(if_list); if_entry != NULL;
843 if_entry = g_list_next(if_entry)) {
844 if_info = if_entry->data;
845 printf("%d. %s", i++, if_info->name);
846 if (if_info->description != NULL)
847 printf(" (%s)", if_info->description);
850 free_interface_list(if_list);
853 capture_option_specified = TRUE;
858 out_file_type = wtap_short_string_to_file_type(optarg);
859 if (out_file_type < 0) {
860 fprintf(stderr, "tethereal: \"%s\" isn't a valid capture file type\n",
865 case 'h': /* Print help and exit */
869 case 'i': /* Use interface xxx */
872 * If the argument is a number, treat it as an index into the list
873 * of adapters, as printed by "tethereal -D".
875 * This should be OK on UNIX systems, as interfaces shouldn't have
876 * names that begin with digits. It can be useful on Windows, where
877 * more than one interface can have the same name.
879 adapter_index = strtol(optarg, &p, 10);
880 if (p != NULL && *p == '\0') {
881 if (adapter_index < 0) {
883 "tethereal: The specified adapter index is a negative number\n");
886 if (adapter_index > INT_MAX) {
888 "tethereal: The specified adapter index is too large (greater than %d)\n",
892 if (adapter_index == 0) {
893 fprintf(stderr, "tethereal: there is no interface with that adapter index\n");
896 if_list = get_interface_list(&err, err_str);
897 if (if_list == NULL) {
900 case CANT_GET_INTERFACE_LIST:
901 cant_get_if_list_errstr =
902 cant_get_if_list_error_message(err_str);
903 fprintf(stderr, "tethereal: %s\n", cant_get_if_list_errstr);
904 g_free(cant_get_if_list_errstr);
907 case NO_INTERFACES_FOUND:
908 fprintf(stderr, "tethereal: There are no interfaces on which a capture can be done\n");
913 if_info = g_list_nth_data(if_list, adapter_index - 1);
914 if (if_info == NULL) {
915 fprintf(stderr, "tethereal: there is no interface with that adapter index\n");
918 capture_opts.iface = g_strdup(if_info->name);
919 free_interface_list(if_list);
921 capture_opts.iface = g_strdup(optarg);
923 capture_option_specified = TRUE;
927 case 'l': /* "Line-buffer" standard output */
928 /* This isn't line-buffering, strictly speaking, it's just
929 flushing the standard output after the information for
930 each packet is printed; however, that should be good
931 enough for all the purposes to which "-l" is put (and
932 is probably actually better for "-V", as it does fewer
935 See the comment in "process_packet()" for an explanation of
936 why we do that, and why we don't just use "setvbuf()" to
937 make the standard output line-buffered (short version: in
938 Windows, "line-buffered" is the same as "fully-buffered",
939 and the output buffer is only flushed when it fills up). */
940 line_buffered = TRUE;
942 case 'L': /* Print list of link-layer types and exit */
944 list_link_layer_types = TRUE;
947 capture_option_specified = TRUE;
951 case 'n': /* No name resolution */
952 g_resolv_flags = RESOLV_NONE;
954 case 'N': /* Select what types of addresses/port #s to resolve */
955 if (g_resolv_flags == RESOLV_ALL)
956 g_resolv_flags = RESOLV_NONE;
957 badopt = string_to_name_resolve(optarg, &g_resolv_flags);
958 if (badopt != '\0') {
959 fprintf(stderr, "tethereal: -N specifies unknown resolving option '%c'; valid options are 'm', 'n', and 't'\n",
964 case 'o': /* Override preference from command line */
965 switch (prefs_set_pref(optarg)) {
967 case PREFS_SET_SYNTAX_ERR:
968 fprintf(stderr, "tethereal: Invalid -o flag \"%s\"\n", optarg);
972 case PREFS_SET_NO_SUCH_PREF:
973 case PREFS_SET_OBSOLETE:
974 fprintf(stderr, "tethereal: -o flag \"%s\" specifies unknown preference\n",
980 case 'q': /* Quiet */
983 case 'r': /* Read capture file xxx */
984 cf_name = g_strdup(optarg);
986 case 'R': /* Read file filter */
989 case 'S': /* show packets in real time */
990 print_packet_info = TRUE;
992 case 't': /* Time stamp type */
993 if (strcmp(optarg, "r") == 0)
994 set_timestamp_setting(TS_RELATIVE);
995 else if (strcmp(optarg, "a") == 0)
996 set_timestamp_setting(TS_ABSOLUTE);
997 else if (strcmp(optarg, "ad") == 0)
998 set_timestamp_setting(TS_ABSOLUTE_WITH_DATE);
999 else if (strcmp(optarg, "d") == 0)
1000 set_timestamp_setting(TS_DELTA);
1002 fprintf(stderr, "tethereal: Invalid time stamp type \"%s\"\n",
1004 fprintf(stderr, "It must be \"r\" for relative, \"a\" for absolute,\n");
1005 fprintf(stderr, "\"ad\" for absolute with date, or \"d\" for delta.\n");
1009 case 'T': /* printing Type */
1010 if (strcmp(optarg, "text") == 0) {
1011 output_action = WRITE_TEXT;
1012 print_format = PR_FMT_TEXT;
1013 } else if (strcmp(optarg, "ps") == 0) {
1014 output_action = WRITE_TEXT;
1015 print_format = PR_FMT_PS;
1016 } else if (strcmp(optarg, "pdml") == 0) {
1017 output_action = WRITE_XML;
1019 } else if (strcmp(optarg, "psml") == 0) {
1020 output_action = WRITE_XML;
1023 fprintf(stderr, "tethereal: Invalid -T parameter.\n");
1024 fprintf(stderr, "It must be \"ps\", \"text\", \"pdml\", or \"psml\".\n");
1028 case 'v': /* Show version and exit */
1029 printf("t" PACKAGE " " VERSION
1034 comp_info_str->str, runtime_info_str->str);
1037 case 'w': /* Write to capture file xxx */
1038 save_file = g_strdup(optarg);
1040 case 'V': /* Verbose */
1043 case 'x': /* Print packet data in hex (and ASCII) */
1047 for(tli=tap_list;tli;tli=tli->next){
1048 if(!strncmp(tli->cmd,optarg,strlen(tli->cmd))){
1049 /* we won't call the init function for the tap this soon
1050 as it would disallow mate's fields (which are registered
1051 by the preferences set callback) from being used as
1052 part of a tap filter */
1053 tli_optarg = g_strdup(optarg);
1058 fprintf(stderr,"tethereal: invalid -z argument.\n");
1059 fprintf(stderr," -z argument must be one of :\n");
1060 for(tli=tap_list;tli;tli=tli->next){
1061 fprintf(stderr," %s\n",tli->cmd);
1067 case '?': /* Bad flag - print usage message */
1073 /* If no capture filter or read filter has been specified, and there are
1074 still command-line arguments, treat them as the tokens of a capture
1075 filter (if no "-r" flag was specified) or a read filter (if a "-r"
1076 flag was specified. */
1077 if (optind < argc) {
1078 if (cf_name != NULL) {
1079 if (rfilter != NULL) {
1081 "tethereal: Read filters were specified both with \"-R\" and with additional command-line arguments\n");
1084 rfilter = get_args_as_string(argc, argv, optind);
1087 if (capture_filter_specified) {
1089 "tethereal: Capture filters were specified both with \"-f\" and with additional command-line arguments\n");
1092 capture_opts.cfilter = get_args_as_string(argc, argv, optind);
1094 capture_option_specified = TRUE;
1099 /* See if we're writing a capture file and the file is a pipe */
1101 ld.output_to_pipe = FALSE;
1103 if (save_file != NULL) {
1104 /* We're writing to a capture file. */
1105 if (strcmp(save_file, "-") == 0) {
1106 /* Write to the standard output. */
1108 save_file = g_strdup("");
1110 /* XXX - should we check whether it's a pipe? It's arguably
1111 silly to do "-w - >output_file" rather than "-w output_file",
1112 but by not checking we might be violating the Principle Of
1113 Least Astonishment. */
1114 ld.output_to_pipe = TRUE;
1119 err = test_for_fifo(save_file);
1122 case ENOENT: /* it doesn't exist, so we'll be creating it,
1123 and it won't be a FIFO */
1124 case 0: /* found it, but it's not a FIFO */
1127 case ESPIPE: /* it is a FIFO */
1128 ld.output_to_pipe = TRUE;
1131 default: /* couldn't stat it */
1133 "tethereal: Error testing whether capture file is a pipe: %s\n",
1140 /* We're not writing to a file, so we should print packet information
1141 unless "-q" was specified. */
1143 print_packet_info = TRUE;
1146 #ifndef HAVE_LIBPCAP
1147 if (capture_option_specified)
1148 fprintf(stderr, "This version of Tethereal was not built with support for capturing packets.\n");
1155 /* We don't support capture filters when reading from a capture file
1156 (the BPF compiler doesn't support all link-layer types that we
1157 support in capture files we read). */
1159 if (cf_name != NULL) {
1160 if (capture_filter_specified) {
1162 "tethereal: Only read filters, not capture filters, can be specified when reading a capture file.\n");
1169 if (output_action != WRITE_TEXT) {
1170 fprintf(stderr, "tethereal: Raw packet hex data can only be printed as text or PostScript\n");
1176 if (list_link_layer_types) {
1177 /* We're supposed to list the link-layer types for an interface;
1178 did the user also specify a capture file to be read? */
1180 /* Yes - that's bogus. */
1181 fprintf(stderr, "tethereal: You can't specify -L and a capture file to be read.\n");
1184 /* No - did they specify a ring buffer option? */
1185 if (capture_opts.multi_files_on) {
1186 fprintf(stderr, "tethereal: Ring buffer requested, but a capture isn't being done.\n");
1190 /* If they didn't specify a "-w" flag, but specified a maximum capture
1191 file size, tell them that this doesn't work, and exit. */
1192 if (capture_opts.has_autostop_filesize && save_file == NULL) {
1193 fprintf(stderr, "tethereal: Maximum capture file size specified, but "
1194 "capture isn't being saved to a file.\n");
1198 if (capture_opts.multi_files_on) {
1199 /* Ring buffer works only under certain conditions:
1200 a) ring buffer does not work if you're not saving the capture to
1202 b) ring buffer only works if you're saving in libpcap format;
1203 c) it makes no sense to enable the ring buffer if the maximum
1204 file size is set to "infinite";
1205 d) file must not be a pipe. */
1206 if (save_file == NULL) {
1207 fprintf(stderr, "tethereal: Ring buffer requested, but "
1208 "capture isn't being saved to a file.\n");
1211 if (out_file_type != WTAP_FILE_PCAP) {
1212 fprintf(stderr, "tethereal: Ring buffer requested, but "
1213 "capture isn't being saved in libpcap format.\n");
1216 if (!capture_opts.has_autostop_filesize) {
1217 fprintf(stderr, "tethereal: Ring buffer requested, but "
1218 "no maximum capture file size was specified.\n");
1221 if (ld.output_to_pipe) {
1222 fprintf(stderr, "tethereal: Ring buffer requested, but "
1223 "capture file is a pipe.\n");
1231 /* Start windows sockets */
1232 WSAStartup( MAKEWORD( 1, 1 ), &wsaData );
1235 /* Notify all registered modules that have had any of their preferences
1236 changed either from one of the preferences file or from the command
1237 line that their preferences have changed. */
1240 /* At this point mate will have registered its field array so we can
1241 have a filter with one of mate's late registered fields as part
1242 of the tap's filter */
1243 if (tli_optarg != NULL) {
1244 (*tli->func)(tli_optarg);
1248 /* disabled protocols as per configuration file */
1249 if (gdp_path == NULL && dp_path == NULL) {
1250 set_disabled_protos_list();
1253 /* Build the column format array */
1254 col_setup(&cfile.cinfo, prefs->num_cols);
1255 for (i = 0; i < cfile.cinfo.num_cols; i++) {
1256 cfile.cinfo.col_fmt[i] = get_column_format(i);
1257 cfile.cinfo.col_title[i] = g_strdup(get_column_title(i));
1258 cfile.cinfo.fmt_matx[i] = (gboolean *) g_malloc0(sizeof(gboolean) *
1260 get_column_format_matches(cfile.cinfo.fmt_matx[i], cfile.cinfo.col_fmt[i]);
1261 cfile.cinfo.col_data[i] = NULL;
1262 if (cfile.cinfo.col_fmt[i] == COL_INFO)
1263 cfile.cinfo.col_buf[i] = (gchar *) g_malloc(sizeof(gchar) * COL_MAX_INFO_LEN);
1265 cfile.cinfo.col_buf[i] = (gchar *) g_malloc(sizeof(gchar) * COL_MAX_LEN);
1266 cfile.cinfo.col_fence[i] = 0;
1267 cfile.cinfo.col_expr[i] = (gchar *) g_malloc(sizeof(gchar) * COL_MAX_LEN);
1268 cfile.cinfo.col_expr_val[i] = (gchar *) g_malloc(sizeof(gchar) * COL_MAX_LEN);
1271 for (i = 0; i < cfile.cinfo.num_cols; i++) {
1274 for (j = 0; j < NUM_COL_FMTS; j++) {
1275 if (!cfile.cinfo.fmt_matx[i][j])
1278 if (cfile.cinfo.col_first[j] == -1)
1279 cfile.cinfo.col_first[j] = i;
1280 cfile.cinfo.col_last[j] = i;
1285 if (capture_opts.snaplen < 1)
1286 capture_opts.snaplen = WTAP_MAX_PACKET_SIZE;
1287 else if (capture_opts.snaplen < MIN_PACKET_SIZE)
1288 capture_opts.snaplen = MIN_PACKET_SIZE;
1290 /* Check the value range of the ring_num_files parameter */
1291 if (capture_opts.ring_num_files > RINGBUFFER_MAX_NUM_FILES)
1292 capture_opts.ring_num_files = RINGBUFFER_MAX_NUM_FILES;
1293 #if RINGBUFFER_MIN_NUM_FILES > 0
1294 else if (capture_opts.ring_num_files < RINGBUFFER_MIN_NUM_FILES)
1295 capture_opts.ring_num_files = RINGBUFFER_MIN_NUM_FILES;
1299 if (rfilter != NULL) {
1300 if (!dfilter_compile(rfilter, &rfcode)) {
1301 fprintf(stderr, "tethereal: %s\n", dfilter_error_msg);
1303 #ifdef HAVE_PCAP_OPEN_DEAD
1307 pc = pcap_open_dead(DLT_EN10MB, MIN_PACKET_SIZE);
1309 if (pcap_compile(pc, &fcode, rfilter, 0, 0) != -1) {
1311 " Note: That display filter code looks like a valid capture filter;\n"
1312 " maybe you mixed them up?\n");
1321 cfile.rfcode = rfcode;
1323 if (print_packet_info) {
1324 /* If we're printing as text or PostScript, we have
1325 to create a print stream. */
1326 if (output_action == WRITE_TEXT) {
1327 switch (print_format) {
1330 print_stream = print_stream_text_stdio_new(stdout);
1334 print_stream = print_stream_ps_stdio_new(stdout);
1338 g_assert_not_reached();
1343 /* We have to dissect each packet if:
1345 we're printing information about each packet;
1347 we're using a read filter on the packets;
1349 we're using any taps. */
1350 do_dissection = print_packet_info || rfcode || have_tap_listeners();
1354 * We're reading a capture file.
1359 * Immediately relinquish any set-UID or set-GID privileges we have;
1360 * we must not be allowed to read any capture files the user running
1361 * Tethereal can't open.
1367 if (cf_open(&cfile, cf_name, FALSE, &err) != CF_OK) {
1371 err = load_cap_file(&cfile, save_file, out_file_type);
1378 /* No capture file specified, so we're supposed to do a live capture
1379 (or get a list of link-layer types for a live capture device);
1380 do we have support for live captures? */
1385 fprintf(stderr, "tethereal: Could not load wpcap.dll.\n");
1390 /* Yes; did the user specify an interface to use? */
1391 if (capture_opts.iface == NULL) {
1392 /* No - is a default specified in the preferences file? */
1393 if (prefs->capture_device != NULL) {
1395 if_text = strrchr(prefs->capture_device, ' ');
1396 if (if_text == NULL) {
1397 capture_opts.iface = g_strdup(prefs->capture_device);
1399 capture_opts.iface = g_strdup(if_text + 1); /* Skip over space */
1402 /* No - pick the first one from the list of interfaces. */
1403 if_list = get_interface_list(&err, err_str);
1404 if (if_list == NULL) {
1407 case CANT_GET_INTERFACE_LIST:
1408 cant_get_if_list_errstr =
1409 cant_get_if_list_error_message(err_str);
1410 fprintf(stderr, "tethereal: %s\n", cant_get_if_list_errstr);
1411 g_free(cant_get_if_list_errstr);
1414 case NO_INTERFACES_FOUND:
1415 fprintf(stderr, "tethereal: There are no interfaces on which a capture can be done\n");
1420 if_info = if_list->data; /* first interface */
1421 capture_opts.iface = g_strdup(if_info->name);
1422 free_interface_list(if_list);
1426 if (list_link_layer_types) {
1427 /* We were asked to list the link-layer types for an interface.
1428 Get the list of link-layer types for the capture device. */
1429 lt_list = get_pcap_linktype_list(capture_opts.iface, err_str);
1430 if (lt_list == NULL) {
1431 if (err_str[0] != '\0') {
1432 fprintf(stderr, "tethereal: The list of data link types for the capture device could not be obtained (%s).\n"
1433 "Please check to make sure you have sufficient permissions, and that\n"
1434 "you have the proper interface or pipe specified.\n", err_str);
1436 fprintf(stderr, "tethereal: The capture device has no data link types.\n");
1439 fprintf(stderr, "Data link types (use option -y to set):\n");
1440 for (lt_entry = lt_list; lt_entry != NULL;
1441 lt_entry = g_list_next(lt_entry)) {
1442 data_link_info = lt_entry->data;
1443 fprintf(stderr, " %s", data_link_info->name);
1444 if (data_link_info->description != NULL)
1445 fprintf(stderr, " (%s)", data_link_info->description);
1447 fprintf(stderr, " (not supported)");
1450 free_pcap_linktype_list(lt_list);
1456 * The user didn't ask us not to print a count of packets as
1457 * they arrive, so do so.
1459 print_packet_counts = TRUE;
1462 capture(save_file, out_file_type);
1464 if (capture_opts.multi_files_on) {
1468 /* No - complain. */
1469 fprintf(stderr, "This version of Tethereal was not built with support for capturing packets.\n");
1474 draw_tap_listeners(TRUE);
1481 /* Do the low-level work of a capture.
1482 Returns TRUE if it succeeds, FALSE otherwise. */
1484 static condition *volatile cnd_ring_timeout = NULL; /* this must be visible in process_packet */
1487 capture(char *save_file, int out_file_type)
1491 gchar open_err_str[PCAP_ERRBUF_SIZE];
1492 gchar lookup_net_err_str[PCAP_ERRBUF_SIZE];
1493 bpf_u_int32 netnum, netmask;
1494 struct bpf_program fcode;
1495 const char *set_linktype_err_str;
1497 int volatile volatile_err = 0;
1498 int volatile inpkts = 0;
1500 char errmsg[1024+1];
1501 condition *volatile cnd_stop_capturesize = NULL;
1502 condition *volatile cnd_stop_timeout = NULL;
1505 void (*oldhandler)(int);
1506 static const char ppamsg[] = "can't find PPA for ";
1508 volatile int pipe_fd = -1;
1509 struct pcap_hdr hdr;
1510 struct pcaprec_modified_hdr rechdr;
1511 guchar pcap_data[WTAP_MAX_PACKET_SIZE];
1513 struct pcap_stat stats;
1516 dfilter_t *rfcode = NULL;
1519 /* Initialize all data structures used for dissection. */
1522 ld.linktype = WTAP_ENCAP_UNKNOWN;
1525 /* Open the network interface to capture from it.
1526 Some versions of libpcap may put warnings into the error buffer
1527 if they succeed; to tell if that's happened, we have to clear
1528 the error buffer, and check if it's still a null string. */
1529 open_err_str[0] = '\0';
1530 ld.pch = pcap_open_live(capture_opts.iface, capture_opts.snaplen,
1531 capture_opts.promisc_mode, 1000, open_err_str);
1533 if (ld.pch != NULL) {
1534 /* setting the data link type only works on real interfaces */
1535 if (capture_opts.linktype != -1) {
1536 set_linktype_err_str = set_pcap_linktype(ld.pch, capture_opts.iface,
1537 capture_opts.linktype);
1538 if (set_linktype_err_str != NULL) {
1539 snprintf(errmsg, sizeof errmsg, "Unable to set data link type (%s).",
1540 set_linktype_err_str);
1545 /* We couldn't open "cfile.iface" as a network device. */
1547 /* On Windows, we don't support capturing on pipes, so we give up. */
1549 /* On Win32 OSes, the capture devices are probably available to all
1550 users; don't warn about permissions problems.
1552 Do, however, warn that WAN devices aren't supported. */
1553 snprintf(errmsg, sizeof errmsg,
1554 "The capture session could not be initiated (%s).\n"
1555 "Please check that you have the proper interface specified.\n"
1557 "Note that the WinPcap 2.x version of the driver Ethereal uses for packet\n"
1558 "capture on Windows doesn't support capturing on PPP/WAN interfaces in\n"
1559 "Windows NT/2000/XP/2003 Server, and that the WinPcap 3.0 and later versions\n"
1560 "don't support capturing on PPP/WAN interfaces at all.\n",
1564 /* try to open cfile.iface as a pipe */
1565 pipe_fd = pipe_open_live(capture_opts.iface, &hdr, &ld, errmsg,
1568 if (pipe_fd == -1) {
1570 if (ld.pipe_err == PIPNEXIST) {
1571 /* Pipe doesn't exist, so output message for interface */
1573 /* If we got a "can't find PPA for XXX" message, warn the user (who
1574 is running Tethereal on HP-UX) that they don't have a version
1575 of libpcap that properly handles HP-UX (libpcap 0.6.x and later
1576 versions, which properly handle HP-UX, say "can't find /dev/dlpi
1577 PPA for XXX" rather than "can't find PPA for XXX"). */
1578 if (strncmp(open_err_str, ppamsg, sizeof ppamsg - 1) == 0)
1581 "You are running Tethereal with a version of the libpcap library\n"
1582 "that doesn't handle HP-UX network devices well; this means that\n"
1583 "Tethereal may not be able to capture packets.\n"
1585 "To fix this, you should install libpcap 0.6.2, or a later version\n"
1586 "of libpcap, rather than libpcap 0.4 or 0.5.x. It is available in\n"
1587 "packaged binary form from the Software Porting And Archive Centre\n"
1588 "for HP-UX; the Centre is at http://hpux.connect.org.uk/ - the page\n"
1589 "at the URL lists a number of mirror sites.";
1592 snprintf(errmsg, sizeof errmsg,
1593 "The capture session could not be initiated (%s).\n"
1594 "Please check to make sure you have sufficient permissions, and that\n"
1595 "you have the proper interface or pipe specified.%s", open_err_str,
1599 * Else pipe (or file) does exist and pipe_open_live() has
1604 /* pipe_open_live() succeeded; don't want
1605 error message from pcap_open_live() */
1606 open_err_str[0] = '\0';
1612 * We've opened the capture device, so, if we're set-UID or set-GID,
1613 * relinquish those privileges.
1615 * XXX - if we have saved set-user-ID support, we should give up those
1616 * privileges immediately, and then reclaim them long enough to get
1617 * a list of network interfaces and to open one, and then give them
1618 * up again, so that stuff we do while processing the argument list,
1619 * reading the user's preferences, etc. is done as the real user and
1620 * group, not the effective user and group.
1626 if (capture_opts.cfilter && !ld.from_pipe) {
1627 /* A capture filter was specified; set it up. */
1628 if (pcap_lookupnet(capture_opts.iface, &netnum, &netmask, lookup_net_err_str) < 0) {
1630 * Well, we can't get the netmask for this interface; it's used
1631 * only for filters that check for broadcast IP addresses, so
1632 * we just warn the user, and punt and use 0.
1635 "Warning: Couldn't obtain netmask info (%s).\n", lookup_net_err_str);
1638 if (pcap_compile(ld.pch, &fcode, capture_opts.cfilter, 1, netmask) < 0) {
1639 if (dfilter_compile(capture_opts.cfilter, &rfcode)) {
1640 snprintf(errmsg, sizeof errmsg,
1641 "Unable to parse capture filter string (%s).\n"
1642 " Interestingly enough, this looks like a valid display filter\n"
1643 " Are you sure you didn't mix them up?",
1644 pcap_geterr(ld.pch));
1646 snprintf(errmsg, sizeof errmsg,
1647 "Unable to parse capture filter string (%s).",
1648 pcap_geterr(ld.pch));
1652 if (pcap_setfilter(ld.pch, &fcode) < 0) {
1653 snprintf(errmsg, sizeof errmsg, "Can't install filter (%s).",
1654 pcap_geterr(ld.pch));
1659 /* Set up to write to the capture file. */
1662 pcap_encap = hdr.network;
1663 file_snaplen = hdr.snaplen;
1667 pcap_encap = get_pcap_linktype(ld.pch, capture_opts.iface);
1668 file_snaplen = pcap_snapshot(ld.pch);
1670 ld.linktype = wtap_pcap_encap_to_wtap_encap(pcap_encap);
1671 if (save_file != NULL) {
1672 /* Set up to write to the capture file. */
1673 if (ld.linktype == WTAP_ENCAP_UNKNOWN) {
1674 strcpy(errmsg, "The network you're capturing from is of a type"
1675 " that Tethereal doesn't support.");
1678 ld.save_file = save_file;
1679 if (capture_opts.multi_files_on) {
1680 save_file_fd = ringbuf_init(save_file,
1681 capture_opts.ring_num_files);
1682 if (save_file_fd != -1) {
1683 ld.pdh = ringbuf_init_wtap_dump_fdopen(out_file_type, ld.linktype,
1684 file_snaplen, &err);
1686 err = errno; /* "ringbuf_init()" failed */
1690 ld.pdh = wtap_dump_open(save_file, out_file_type,
1691 ld.linktype, file_snaplen, &err);
1694 if (ld.pdh == NULL) {
1695 snprintf(errmsg, sizeof errmsg,
1696 cf_open_error_message(err, NULL, TRUE, out_file_type),
1697 *save_file == '\0' ? "stdout" : save_file);
1702 /* Does "open_err_str" contain a non-empty string? If so, "pcap_open_live()"
1703 returned a warning; print it, but keep capturing. */
1704 if (open_err_str[0] != '\0')
1705 fprintf(stderr, "tethereal: WARNING: %s.\n", open_err_str);
1708 /* Catch a CTRL+C event and, if we get it, clean up and exit. */
1709 SetConsoleCtrlHandler(capture_cleanup, TRUE);
1711 /* Catch SIGINT and SIGTERM and, if we get either of them, clean up
1713 XXX - deal with signal semantics on various UNIX platforms. Or just
1714 use "sigaction()" and be done with it? */
1715 signal(SIGTERM, capture_cleanup);
1716 signal(SIGINT, capture_cleanup);
1717 if ((oldhandler = signal(SIGHUP, capture_cleanup)) != SIG_DFL)
1718 signal(SIGHUP, oldhandler);
1721 /* Catch SIGINFO and, if we get it and we're capturing to a file in
1722 quiet mode, report the number of packets we've captured. */
1723 signal(SIGINFO, report_counts_siginfo);
1724 #endif /* SIGINFO */
1727 /* Let the user know what interface was chosen. */
1728 descr = get_interface_descriptive_name(capture_opts.iface);
1729 fprintf(stderr, "Capturing on %s\n", descr);
1732 /* initialize capture stop conditions */
1733 init_capture_stop_conditions();
1734 /* create stop conditions */
1735 if (capture_opts.has_autostop_filesize)
1736 cnd_stop_capturesize = cnd_new((const char*)CND_CLASS_CAPTURESIZE,
1737 (long)capture_opts.autostop_filesize * 1000);
1738 if (capture_opts.has_autostop_duration)
1739 cnd_stop_timeout = cnd_new((const char*)CND_CLASS_TIMEOUT,
1740 (gint32)capture_opts.autostop_duration);
1742 if (capture_opts.multi_files_on && capture_opts.has_file_duration)
1743 cnd_ring_timeout = cnd_new(CND_CLASS_TIMEOUT,
1744 capture_opts.file_duration);
1746 if (!setjmp(ld.stopenv)) {
1748 ld.packet_count = 0;
1752 /* We need to be careful with automatic variables defined in the
1753 outer scope which are changed inside the loop. Most compilers
1754 don't try to roll them back to their original values after the
1755 longjmp which causes the loop to finish, but all that the
1756 standards say is that their values are indeterminate. If we
1757 don't want them to be rolled back, we should define them with the
1758 volatile attribute (paraphrasing W. Richard Stevens, Advanced
1759 Programming in the UNIX Environment, p. 178).
1761 The "err" variable causes a particular problem. If we give it
1762 the volatile attribute, then when we pass a reference to it (as
1763 in "&err") to a function, GCC warns: "passing arg <n> of
1764 <function> discards qualifiers from pointer target type".
1765 Therefore within the loop and just beyond we don't use "err".
1766 Within the loop we define "loop_err", and assign its value to
1767 "volatile_err", which is in the outer scope and is checked when
1770 We also define "packet_count_prev" here to keep things tidy,
1771 since it's used only inside the loop. If it were defined in the
1772 outer scope, GCC would give a warning (unnecessary in this case)
1773 that it might be clobbered, and we'd need to give it the volatile
1774 attribute to suppress the warning. */
1777 int packet_count_prev = 0;
1779 if (cnd_stop_capturesize == NULL && cnd_stop_timeout == NULL) {
1780 /* We're not stopping at a particular capture file size, and we're
1781 not stopping after some particular amount of time has expired,
1782 so either we have no stop condition or the only stop condition
1783 is a maximum packet count.
1785 If there's no maximum packet count, pass it -1, meaning "until
1786 you run out of packets in the bufferful you read". Otherwise,
1787 pass it the number of packets we have left to capture.
1789 We don't call "pcap_loop()" as, if we're saving to a file that's
1790 a FIFO, we want to flush the FIFO after we're done processing
1791 this libpcap bufferful of packets, so that the program
1792 reading the FIFO sees the packets immediately and doesn't get
1793 any partial packet, forcing it to block in the middle of reading
1795 if (capture_opts.autostop_packets == 0)
1798 if (ld.packet_count >= capture_opts.autostop_packets) {
1799 /* XXX do we need this test here? */
1800 /* It appears there's nothing more to capture. */
1803 pcap_cnt = capture_opts.autostop_packets - ld.packet_count;
1806 /* We need to check the capture file size or the timeout after
1812 inpkts = pipe_dispatch(pipe_fd, &ld, &hdr, &rechdr, pcap_data,
1813 errmsg, sizeof errmsg);
1816 inpkts = pcap_dispatch(ld.pch, pcap_cnt, capture_pcap_cb, (guchar *) &ld);
1818 /* Error from "pcap_dispatch()", or error or "no more packets" from
1819 "pipe_dispatch(). */
1821 } else if (cnd_stop_timeout != NULL && cnd_eval(cnd_stop_timeout)) {
1822 /* The specified capture time has elapsed; stop the capture. */
1824 } else if (inpkts > 0) {
1825 if (capture_opts.autostop_packets != 0 &&
1826 ld.packet_count >= capture_opts.autostop_packets) {
1827 /* The specified number of packets have been captured and have
1828 passed both any capture filter in effect and any read filter
1831 } else if (cnd_stop_capturesize != NULL &&
1832 cnd_eval(cnd_stop_capturesize,
1833 (guint32)wtap_get_bytes_dumped(ld.pdh))) {
1834 /* We're saving the capture to a file, and the capture file reached
1835 its maximum size. */
1836 if (capture_opts.multi_files_on) {
1837 /* Switch to the next ringbuffer file */
1838 if (ringbuf_switch_file(&ld.pdh, &save_file, &save_file_fd, &loop_err)) {
1839 /* File switch succeeded: reset the condition */
1840 cnd_reset(cnd_stop_capturesize);
1841 if (cnd_ring_timeout) {
1842 cnd_reset(cnd_ring_timeout);
1845 /* File switch failed: stop here */
1846 volatile_err = loop_err;
1850 /* No ringbuffer - just stop. */
1854 if (ld.output_to_pipe) {
1855 if (ld.packet_count > packet_count_prev) {
1856 if (fflush(wtap_dump_file(ld.pdh))) {
1857 volatile_err = errno;
1860 packet_count_prev = ld.packet_count;
1864 } /* while (ld.go) */
1866 /* delete stop conditions */
1867 if (cnd_stop_capturesize != NULL)
1868 cnd_delete(cnd_stop_capturesize);
1869 if (cnd_stop_timeout != NULL)
1870 cnd_delete(cnd_stop_timeout);
1871 if (cnd_ring_timeout != NULL)
1872 cnd_delete(cnd_ring_timeout);
1874 if (print_packet_counts) {
1875 /* We're printing packet counts to stderr.
1876 Send a newline so that we move to the line after the packet count. */
1877 fprintf(stderr, "\n");
1880 /* If we got an error while capturing, report it. */
1884 if (ld.pipe_err == PIPERR) {
1885 fprintf(stderr, "tethereal: Error while capturing packets: %s\n",
1891 fprintf(stderr, "tethereal: Error while capturing packets: %s\n",
1892 pcap_geterr(ld.pch));
1896 if (volatile_err == 0)
1899 show_capture_file_io_error(save_file, volatile_err, FALSE);
1903 if (save_file != NULL) {
1904 /* We're saving to a file or files; close all files. */
1905 if (capture_opts.multi_files_on) {
1906 dump_ok = ringbuf_wtap_dump_close(&save_file, &err);
1908 dump_ok = wtap_dump_close(ld.pdh, &err);
1910 /* If we've displayed a message about a write error, there's no point
1911 in displaying another message about an error on close. */
1912 if (!dump_ok && !write_err)
1913 show_capture_file_io_error(save_file, err, TRUE);
1917 if (ld.from_pipe && pipe_fd >= 0)
1922 /* Get the capture statistics, and, if any packets were dropped, report
1924 if (pcap_stats(ld.pch, &stats) >= 0) {
1925 if (stats.ps_drop != 0) {
1926 fprintf(stderr, "%u packets dropped\n", stats.ps_drop);
1929 fprintf(stderr, "tethereal: Can't get packet-drop statistics: %s\n",
1930 pcap_geterr(ld.pch));
1935 /* Report the number of captured packets if not reported during capture
1936 and we are saving to a file. */
1942 if (capture_opts.multi_files_on) {
1943 ringbuf_error_cleanup();
1947 fprintf(stderr, "tethereal: %s\n", errmsg);
1963 capture_pcap_cb(guchar *user, const struct pcap_pkthdr *phdr,
1966 struct wtap_pkthdr whdr;
1967 union wtap_pseudo_header pseudo_header;
1968 loop_data *ldat = (loop_data *) user;
1973 /* Convert from libpcap to Wiretap format.
1974 If that fails, ignore the packet (wtap_process_pcap_packet has
1975 written an error message). */
1976 pd = wtap_process_pcap_packet(ldat->linktype, phdr, pd, &pseudo_header,
1983 * Prevent a SIGINFO handler from writing to stdout while we're
1984 * doing so; instead, have it just set a flag telling us to print
1985 * that information when we're done.
1988 #endif /* SIGINFO */
1990 /* The current packet may have arrived after a very long silence,
1991 * way past the time to switch files. In order not to have
1992 * the first packet of a new series of events as the last
1993 * [or only] packet in the file, switch before writing!
1995 if (cnd_ring_timeout != NULL && cnd_eval(cnd_ring_timeout)) {
1996 /* time elapsed for this ring file, switch to the next */
1997 if (ringbuf_switch_file(&ldat->pdh, &ldat->save_file, &save_file_fd, &loop_err)) {
1998 /* File switch succeeded: reset the condition */
1999 cnd_reset(cnd_ring_timeout);
2001 /* File switch failed: stop here */
2002 /* XXX - we should do something with "loop_err" */
2007 if (!process_packet(&cfile, ldat->pdh, 0, &whdr, &pseudo_header, pd, &err)) {
2008 /* Error writing to a capture file */
2009 if (print_packet_counts) {
2010 /* We're printing counts of packets captured; move to the line after
2012 fprintf(stderr, "\n");
2014 show_capture_file_io_error(ldat->save_file, err, FALSE);
2015 pcap_close(ldat->pch);
2016 wtap_dump_close(ldat->pdh, &err);
2022 * Allow SIGINFO handlers to write.
2027 * If a SIGINFO handler asked us to write out capture counts, do so.
2031 #endif /* SIGINFO */
2036 capture_cleanup(DWORD ctrltype _U_)
2038 /* CTRL_C_EVENT is sort of like SIGINT, CTRL_BREAK_EVENT is unique to
2039 Windows, CTRL_CLOSE_EVENT is sort of like SIGHUP, CTRL_LOGOFF_EVENT
2040 is also sort of like SIGHUP, and CTRL_SHUTDOWN_EVENT is sort of
2041 like SIGTERM at least when the machine's shutting down.
2043 For now, we handle them all as indications that we should clean up
2044 and quit, just as we handle SIGINT, SIGHUP, and SIGTERM in that
2047 However, as handlers run in a new thread, we can't just longjmp
2048 out; we have to set "ld.go" to FALSE, and must return TRUE so that
2049 no other handler - such as one that would terminate the process -
2052 XXX - for some reason, typing ^C to Tethereal, if you run this in
2053 a Cygwin console window in at least some versions of Cygwin,
2054 causes Tethereal to terminate immediately; this routine gets
2055 called, but the main loop doesn't get a chance to run and
2056 exit cleanly, at least if this is compiled with Microsoft Visual
2057 C++ (i.e., it's a property of the Cygwin console window or Bash;
2058 it happens if Tethereal is not built with Cygwin - for all I know,
2059 building it with Cygwin may make the problem go away). */
2065 capture_cleanup(int signum _U_)
2067 /* Longjmp back to the starting point; "pcap_dispatch()", on many
2068 UNIX platforms, just keeps looping if it gets EINTR, so if we set
2069 "ld.go" to FALSE and return, we won't break out of it and quit
2071 longjmp(ld.stopenv, 1);
2079 /* XXX - if we use sigaction, this doesn't have to be done.
2080 (Yes, this isn't necessary on BSD, but just in case a system
2081 where "signal()" has AT&T semantics adopts SIGINFO....) */
2082 signal(SIGINFO, report_counts_siginfo);
2083 #endif /* SIGINFO */
2085 if (!print_packet_counts) {
2086 /* Report the count only if we aren't printing a packet count
2087 as packets arrive. */
2088 fprintf(stderr, "%u packets captured\n", ld.packet_count);
2091 infoprint = FALSE; /* we just reported it */
2092 #endif /* SIGINFO */
2097 report_counts_siginfo(int signum _U_)
2099 int sav_errno = errno;
2100 /* If we've been told to delay printing, just set a flag asking
2101 that we print counts (if we're supposed to), otherwise print
2102 the count of packets captured (if we're supposed to). */
2109 #endif /* SIGINFO */
2110 #endif /* HAVE_LIBPCAP */
2113 load_cap_file(capture_file *cf, char *save_file, int out_file_type)
2116 int snapshot_length;
2122 linktype = wtap_file_encap(cf->wth);
2123 if (save_file != NULL) {
2124 /* Set up to write to the capture file. */
2125 snapshot_length = wtap_snapshot_length(cf->wth);
2126 if (snapshot_length == 0) {
2127 /* Snapshot length of input file not known. */
2128 snapshot_length = WTAP_MAX_PACKET_SIZE;
2130 pdh = wtap_dump_open(save_file, out_file_type,
2131 linktype, snapshot_length, &err);
2134 /* We couldn't set up to write to the capture file. */
2137 case WTAP_ERR_UNSUPPORTED_FILE_TYPE:
2139 "tethereal: Capture files can't be written in that format.\n");
2142 case WTAP_ERR_UNSUPPORTED_ENCAP:
2143 case WTAP_ERR_ENCAP_PER_PACKET_UNSUPPORTED:
2145 "tethereal: The capture file being read can't be written in "
2149 case WTAP_ERR_CANT_OPEN:
2151 "tethereal: The file \"%s\" couldn't be created for some "
2152 "unknown reason.\n",
2153 *save_file == '\0' ? "stdout" : save_file);
2156 case WTAP_ERR_SHORT_WRITE:
2158 "tethereal: A full header couldn't be written to the file \"%s\".\n",
2159 *save_file == '\0' ? "stdout" : save_file);
2164 "tethereal: The file \"%s\" could not be created: %s\n.",
2165 *save_file == '\0' ? "stdout" : save_file,
2166 wtap_strerror(err));
2172 if (print_packet_info) {
2173 if (!write_preamble(cf)) {
2175 show_print_file_io_error(err);
2181 while (wtap_read(cf->wth, &err, &err_info, &data_offset)) {
2182 if (!process_packet(cf, pdh, data_offset, wtap_phdr(cf->wth),
2183 wtap_pseudoheader(cf->wth), wtap_buf_ptr(cf->wth),
2185 /* Error writing to a capture file */
2186 show_capture_file_io_error(save_file, err, FALSE);
2187 wtap_dump_close(pdh, &err);
2192 /* Print a message noting that the read failed somewhere along the line. */
2195 case WTAP_ERR_UNSUPPORTED_ENCAP:
2197 "tethereal: \"%s\" has a packet with a network type that Tethereal doesn't support.\n(%s)\n",
2198 cf->filename, err_info);
2201 case WTAP_ERR_CANT_READ:
2203 "tethereal: An attempt to read from \"%s\" failed for some unknown reason.\n",
2207 case WTAP_ERR_SHORT_READ:
2209 "tethereal: \"%s\" appears to have been cut short in the middle of a packet.\n",
2213 case WTAP_ERR_BAD_RECORD:
2215 "tethereal: \"%s\" appears to be damaged or corrupt.\n(%s)\n",
2216 cf->filename, err_info);
2221 "tethereal: An error occurred while reading \"%s\": %s.\n",
2222 cf->filename, wtap_strerror(err));
2225 if (save_file != NULL) {
2226 /* Now close the capture file. */
2227 if (!wtap_dump_close(pdh, &err))
2228 show_capture_file_io_error(save_file, err, TRUE);
2231 if (save_file != NULL) {
2232 /* Now close the capture file. */
2233 if (!wtap_dump_close(pdh, &err))
2234 show_capture_file_io_error(save_file, err, TRUE);
2236 if (print_packet_info) {
2237 if (!write_finale()) {
2239 show_print_file_io_error(err);
2246 wtap_close(cf->wth);
2253 fill_in_fdata(frame_data *fdata, capture_file *cf,
2254 const struct wtap_pkthdr *phdr, long offset)
2259 fdata->num = cf->count;
2260 fdata->pkt_len = phdr->len;
2261 cum_bytes += phdr->len;
2262 fdata->cum_bytes = cum_bytes;
2263 fdata->cap_len = phdr->caplen;
2264 fdata->file_off = offset;
2265 fdata->lnk_t = phdr->pkt_encap;
2266 fdata->abs_secs = phdr->ts.tv_sec;
2267 fdata->abs_usecs = phdr->ts.tv_usec;
2268 fdata->flags.passed_dfilter = 0;
2269 fdata->flags.encoding = CHAR_ASCII;
2270 fdata->flags.visited = 0;
2271 fdata->flags.marked = 0;
2272 fdata->flags.ref_time = 0;
2274 /* If we don't have the time stamp of the first packet in the
2275 capture, it's because this is the first packet. Save the time
2276 stamp of this packet as the time stamp of the first packet. */
2277 if (!firstsec && !firstusec) {
2278 firstsec = fdata->abs_secs;
2279 firstusec = fdata->abs_usecs;
2282 /* If we don't have the time stamp of the previous displayed packet,
2283 it's because this is the first displayed packet. Save the time
2284 stamp of this packet as the time stamp of the previous displayed
2286 if (!prevsec && !prevusec) {
2287 prevsec = fdata->abs_secs;
2288 prevusec = fdata->abs_usecs;
2291 /* Get the time elapsed between the first packet and this packet. */
2292 compute_timestamp_diff(&fdata->rel_secs, &fdata->rel_usecs,
2293 fdata->abs_secs, fdata->abs_usecs, firstsec, firstusec);
2295 /* If it's greater than the current elapsed time, set the elapsed time
2296 to it (we check for "greater than" so as not to be confused by
2297 time moving backwards). */
2298 if ((gint32)cf->esec < fdata->rel_secs
2299 || ((gint32)cf->esec == fdata->rel_secs && (gint32)cf->eusec < fdata->rel_usecs)) {
2300 cf->esec = fdata->rel_secs;
2301 cf->eusec = fdata->rel_usecs;
2304 /* Get the time elapsed between the previous displayed packet and
2306 compute_timestamp_diff(&fdata->del_secs, &fdata->del_usecs,
2307 fdata->abs_secs, fdata->abs_usecs, prevsec, prevusec);
2308 prevsec = fdata->abs_secs;
2309 prevusec = fdata->abs_usecs;
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 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 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 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 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 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->filed = -1; /* not used, but set it anyway */
3012 cf->f_len = 0; /* not used, but set it anyway */
3014 /* Set the file name because we need it to set the follow stream filter.
3015 XXX - is that still true? We need it for other reasons, though,
3017 cf->filename = g_strdup(fname);
3019 /* Indicate whether it's a permanent or temporary file. */
3020 cf->is_tempfile = is_tempfile;
3022 /* If it's a temporary capture buffer file, mark it as not saved. */
3023 cf->user_saved = !is_tempfile;
3025 cf->cd_t = wtap_file_type(cf->wth);
3027 cf->drops_known = FALSE;
3031 cf->snap = wtap_snapshot_length(cf->wth);
3032 if (cf->snap == 0) {
3033 /* Snapshot length not known. */
3034 cf->has_snap = FALSE;
3035 cf->snap = WTAP_MAX_PACKET_SIZE;
3037 cf->has_snap = TRUE;
3038 firstsec = 0, firstusec = 0;
3039 prevsec = 0, prevusec = 0;
3044 snprintf(err_msg, sizeof err_msg,
3045 cf_open_error_message(*err, err_info, FALSE, 0), fname);
3046 fprintf(stderr, "tethereal: %s\n", err_msg);
3052 /* Take care of byte order in the libpcap headers read from pipes.
3053 * (function taken from wiretap/libpcap.c) */
3055 adjust_header(loop_data *ldat, struct pcap_hdr *hdr, struct pcaprec_hdr *rechdr)
3057 if (ldat->byte_swapped) {
3058 /* Byte-swap the record header fields. */
3059 rechdr->ts_sec = BSWAP32(rechdr->ts_sec);
3060 rechdr->ts_usec = BSWAP32(rechdr->ts_usec);
3061 rechdr->incl_len = BSWAP32(rechdr->incl_len);
3062 rechdr->orig_len = BSWAP32(rechdr->orig_len);
3065 /* In file format version 2.3, the "incl_len" and "orig_len" fields were
3066 swapped, in order to match the BPF header layout.
3068 Unfortunately, some files were, according to a comment in the "libpcap"
3069 source, written with version 2.3 in their headers but without the
3070 interchanged fields, so if "incl_len" is greater than "orig_len" - which
3071 would make no sense - we assume that we need to swap them. */
3072 if (hdr->version_major == 2 &&
3073 (hdr->version_minor < 3 ||
3074 (hdr->version_minor == 3 && rechdr->incl_len > rechdr->orig_len))) {
3077 temp = rechdr->orig_len;
3078 rechdr->orig_len = rechdr->incl_len;
3079 rechdr->incl_len = temp;
3083 /* Mimic pcap_open_live() for pipe captures
3084 * We check if "pipename" is "-" (stdin) or a FIFO, open it, and read the
3086 * N.B. : we can't read the libpcap formats used in RedHat 6.1 or SuSE 6.3
3087 * because we can't seek on pipes (see wiretap/libpcap.c for details) */
3089 pipe_open_live(char *pipename, struct pcap_hdr *hdr, loop_data *ldat,
3090 char *errmsg, int errmsgl)
3092 struct stat pipe_stat;
3096 unsigned int bytes_read;
3099 * XXX Tethereal blocks until we return
3101 if (strcmp(pipename, "-") == 0)
3102 fd = 0; /* read from stdin */
3104 if (stat(pipename, &pipe_stat) < 0) {
3105 if (errno == ENOENT || errno == ENOTDIR)
3106 ldat->pipe_err = PIPNEXIST;
3108 snprintf(errmsg, errmsgl,
3109 "The capture session could not be initiated "
3110 "due to error on pipe: %s", strerror(errno));
3111 ldat->pipe_err = PIPERR;
3115 if (! S_ISFIFO(pipe_stat.st_mode)) {
3116 if (S_ISCHR(pipe_stat.st_mode)) {
3118 * Assume the user specified an interface on a system where
3119 * interfaces are in /dev. Pretend we haven't seen it.
3121 ldat->pipe_err = PIPNEXIST;
3123 snprintf(errmsg, errmsgl,
3124 "The capture session could not be initiated because\n"
3125 "\"%s\" is neither an interface nor a pipe", pipename);
3126 ldat->pipe_err = PIPERR;
3130 fd = open(pipename, O_RDONLY);
3132 snprintf(errmsg, errmsgl,
3133 "The capture session could not be initiated "
3134 "due to error on pipe open: %s", strerror(errno));
3135 ldat->pipe_err = PIPERR;
3140 ldat->from_pipe = TRUE;
3142 /* read the pcap header */
3144 while (bytes_read < sizeof magic) {
3145 b = read(fd, ((char *)&magic)+bytes_read, sizeof magic-bytes_read);
3148 snprintf(errmsg, errmsgl, "End of file on pipe during open");
3150 snprintf(errmsg, errmsgl, "Error on pipe during open: %s",
3159 /* Host that wrote it has our byte order, and was running
3160 a program using either standard or ss990417 libpcap. */
3161 ldat->byte_swapped = FALSE;
3162 ldat->modified = FALSE;
3164 case PCAP_MODIFIED_MAGIC:
3165 /* Host that wrote it has our byte order, but was running
3166 a program using either ss990915 or ss991029 libpcap. */
3167 ldat->byte_swapped = FALSE;
3168 ldat->modified = TRUE;
3170 case PCAP_SWAPPED_MAGIC:
3171 /* Host that wrote it has a byte order opposite to ours,
3172 and was running a program using either standard or
3173 ss990417 libpcap. */
3174 ldat->byte_swapped = TRUE;
3175 ldat->modified = FALSE;
3177 case PCAP_SWAPPED_MODIFIED_MAGIC:
3178 /* Host that wrote it out has a byte order opposite to
3179 ours, and was running a program using either ss990915
3180 or ss991029 libpcap. */
3181 ldat->byte_swapped = TRUE;
3182 ldat->modified = TRUE;
3185 /* Not a "libpcap" type we know about. */
3186 snprintf(errmsg, errmsgl, "Unrecognized libpcap format");
3190 /* Read the rest of the header */
3192 while (bytes_read < sizeof(struct pcap_hdr)) {
3193 b = read(fd, ((char *)hdr)+bytes_read,
3194 sizeof(struct pcap_hdr) - bytes_read);
3197 snprintf(errmsg, errmsgl, "End of file on pipe during open");
3199 snprintf(errmsg, errmsgl, "Error on pipe during open: %s",
3206 if (ldat->byte_swapped) {
3207 /* Byte-swap the header fields about which we care. */
3208 hdr->version_major = BSWAP16(hdr->version_major);
3209 hdr->version_minor = BSWAP16(hdr->version_minor);
3210 hdr->snaplen = BSWAP32(hdr->snaplen);
3211 hdr->network = BSWAP32(hdr->network);
3214 if (hdr->version_major < 2) {
3215 snprintf(errmsg, errmsgl, "Unable to read old libpcap format");
3219 ldat->pipe_state = STATE_EXPECT_REC_HDR;
3220 ldat->pipe_err = PIPOK;
3224 ldat->pipe_err = PIPERR;
3229 /* We read one record from the pipe, take care of byte order in the record
3230 * header, write the record in the capture file, and update capture statistics. */
3233 pipe_dispatch(int fd, loop_data *ldat, struct pcap_hdr *hdr,
3234 struct pcaprec_modified_hdr *rechdr, guchar *data,
3235 char *errmsg, int errmsgl)
3237 struct pcap_pkthdr phdr;
3239 enum { PD_REC_HDR_READ, PD_DATA_READ, PD_PIPE_EOF, PD_PIPE_ERR,
3242 switch (ldat->pipe_state) {
3244 case STATE_EXPECT_REC_HDR:
3245 ldat->bytes_to_read = ldat->modified ?
3246 sizeof(struct pcaprec_modified_hdr) : sizeof(struct pcaprec_hdr);
3247 ldat->bytes_read = 0;
3248 ldat->pipe_state = STATE_READ_REC_HDR;
3251 case STATE_READ_REC_HDR:
3252 b = read(fd, ((char *)rechdr)+ldat->bytes_read,
3253 ldat->bytes_to_read - ldat->bytes_read);
3256 result = PD_PIPE_EOF;
3258 result = PD_PIPE_ERR;
3261 if ((ldat->bytes_read += b) < ldat->bytes_to_read)
3263 result = PD_REC_HDR_READ;
3266 case STATE_EXPECT_DATA:
3267 ldat->bytes_read = 0;
3268 ldat->pipe_state = STATE_READ_DATA;
3271 case STATE_READ_DATA:
3272 b = read(fd, data+ldat->bytes_read, rechdr->hdr.incl_len - ldat->bytes_read);
3275 result = PD_PIPE_EOF;
3277 result = PD_PIPE_ERR;
3280 if ((ldat->bytes_read += b) < rechdr->hdr.incl_len)
3282 result = PD_DATA_READ;
3286 snprintf(errmsg, errmsgl, "pipe_dispatch: invalid state");
3289 } /* switch (ldat->pipe_state) */
3292 * We've now read as much data as we were expecting, so process it.
3296 case PD_REC_HDR_READ:
3297 /* We've read the header. Take care of byte order. */
3298 adjust_header(ldat, hdr, &rechdr->hdr);
3299 if (rechdr->hdr.incl_len > WTAP_MAX_PACKET_SIZE) {
3300 snprintf(errmsg, errmsgl, "Frame %u too long (%d bytes)",
3301 ldat->packet_count+1, rechdr->hdr.incl_len);
3304 ldat->pipe_state = STATE_EXPECT_DATA;
3308 /* Fill in a "struct pcap_pkthdr", and process the packet. */
3309 phdr.ts.tv_sec = rechdr->hdr.ts_sec;
3310 phdr.ts.tv_usec = rechdr->hdr.ts_usec;
3311 phdr.caplen = rechdr->hdr.incl_len;
3312 phdr.len = rechdr->hdr.orig_len;
3314 capture_pcap_cb((guchar *)ldat, &phdr, data);
3316 ldat->pipe_state = STATE_EXPECT_REC_HDR;
3320 ldat->pipe_err = PIPEOF;
3324 snprintf(errmsg, errmsgl, "Error reading from pipe: %s",
3331 ldat->pipe_err = PIPERR;
3332 /* Return here rather than inside the switch to prevent GCC warning */
3336 #endif /* HAVE_LIBPCAP */
3339 * General errors are reported with an console message in Tethereal.
3342 failure_message(const char *msg_format, va_list ap)
3344 fprintf(stderr, "tethereal: ");
3345 vfprintf(stderr, msg_format, ap);
3346 fprintf(stderr, "\n");
3350 * Read errors are reported with an console message in Tethereal.
3353 read_failure_message(const char *filename, int err)
3355 fprintf(stderr, "tethereal: An error occurred while reading from the file \"%s\": %s.\n",
3356 filename, strerror(err));