5 * Ethereal - Network traffic analyzer
6 * By Gerald Combs <gerald@ethereal.com>
7 * Copyright 1998 Gerald Combs
9 * Text-mode variant, by Gilbert Ramirez <gram@alumni.rice.edu>
10 * and Guy Harris <guy@alum.mit.edu>.
12 * This program is free software; you can redistribute it and/or
13 * modify it under the terms of the GNU General Public License
14 * as published by the Free Software Foundation; either version 2
15 * of the License, or (at your option) any later version.
17 * This program is distributed in the hope that it will be useful,
18 * but WITHOUT ANY WARRANTY; without even the implied warranty of
19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
20 * GNU General Public License for more details.
22 * You should have received a copy of the GNU General Public License
23 * along with this program; if not, write to the Free Software
24 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
50 #ifdef HAVE_SYS_STAT_H
51 # include <sys/stat.h>
54 #ifdef NEED_STRERROR_H
63 #include <epan/epan.h>
64 #include <epan/filesystem.h>
67 #include <epan/timestamp.h>
68 #include <epan/packet.h>
70 #include "disabled_protos.h"
71 #include <epan/prefs.h>
72 #include <epan/column.h>
74 #include <epan/addr_resolv.h>
76 #include "clopts_common.h"
77 #include "version_info.h"
78 #include <epan/conversation.h>
79 #include <epan/plugins.h>
81 #include "conditions.h"
82 #include "capture_stop_conditions.h"
83 #include "ringbuffer.h"
84 #include "capture_ui_utils.h"
85 #include <epan/epan_dissect.h>
87 #include <epan/stat.h>
88 #include <epan/timestamp.h>
93 #include "pcap-util.h"
94 #include <wiretap/wtap-capture.h>
95 #include <wiretap/libpcap.h>
97 #include "capture-wpcap.h"
100 #endif /* HAVE_LIBPCAP */
101 #include "epan/emem.h"
104 * This is the template for the decode as option; it is shared between the
105 * various functions that output the usage for this parameter.
107 static const gchar decode_as_arg_template[] = "<layer_type>==<selector>,<decode_as_protocol>";
109 static guint32 firstsec, firstusec;
110 static guint32 prevsec, prevusec;
111 static GString *comp_info_str, *runtime_info_str;
113 static gboolean print_packet_info; /* TRUE if we're to print packet information */
115 * The way the packet decode is to be written.
118 WRITE_TEXT, /* summary or detail text */
119 WRITE_XML /* PDML or PSML */
120 /* Add CSV and the like here */
122 static output_action_e output_action;
123 static gboolean do_dissection; /* TRUE if we have to dissect each packet */
124 static gboolean verbose;
125 static gboolean print_hex;
126 static gboolean line_buffered;
127 static guint32 cum_bytes = 0;
128 static print_format_e print_format = PR_FMT_TEXT;
129 static print_stream_t *print_stream;
133 * TRUE if we're to print packet counts to keep track of captured packets.
135 static gboolean print_packet_counts;
137 typedef struct _loop_data {
138 gboolean go; /* TRUE as long as we're supposed to keep capturing */
140 gboolean from_pipe; /* TRUE if we are capturing data from a pipe */
142 char *save_file; /* Name of file to which we're writing */
145 gboolean output_to_pipe;
148 gboolean modified; /* TRUE if data in the pipe uses modified pcap headers */
149 gboolean byte_swapped; /* TRUE if data in the pipe is byte swapped */
150 unsigned int bytes_to_read, bytes_read; /* Used by pipe_dispatch */
152 STATE_EXPECT_REC_HDR, STATE_READ_REC_HDR,
153 STATE_EXPECT_DATA, STATE_READ_DATA
155 enum { PIPOK, PIPEOF, PIPERR, PIPNEXIST } pipe_err;
162 static capture_options capture_opts;
166 static gboolean infodelay; /* if TRUE, don't print capture info in SIGINFO handler */
167 static gboolean infoprint; /* if TRUE, print capture info after clearing infodelay */
169 #endif /* HAVE_LIBPCAP */
172 static int capture(char *, int);
173 static void capture_pcap_cb(guchar *, const struct pcap_pkthdr *,
175 static void report_counts(void);
177 static BOOL WINAPI capture_cleanup(DWORD);
179 static void capture_cleanup(int);
181 static void report_counts_siginfo(int);
184 #endif /* HAVE_LIBPCAP */
186 static int load_cap_file(capture_file *, char *, int);
187 static gboolean process_packet(capture_file *cf, wtap_dumper *pdh, long offset,
188 const struct wtap_pkthdr *whdr, union wtap_pseudo_header *pseudo_header,
189 const guchar *pd, int *err);
190 static void show_capture_file_io_error(const char *, int, gboolean);
191 static void show_print_file_io_error(int err);
192 static gboolean write_preamble(capture_file *cf);
193 static gboolean print_packet(capture_file *cf, epan_dissect_t *edt);
194 static gboolean write_finale(void);
195 static const char *cf_open_error_message(int err, gchar *err_info,
196 gboolean for_writing, int file_type);
199 static void adjust_header(loop_data *, struct pcap_hdr *, struct pcaprec_hdr *);
200 static int pipe_open_live(char *, struct pcap_hdr *, loop_data *, char *, int);
201 static int pipe_dispatch(int, loop_data *, struct pcap_hdr *, \
202 struct pcaprec_modified_hdr *, guchar *, char *, int);
206 static void open_failure_message(const char *filename, int err,
207 gboolean for_writing);
208 static void failure_message(const char *msg_format, va_list ap);
209 static void read_failure_message(const char *filename, int err);
215 print_usage(gboolean print_ver)
222 fprintf(output, "This is GNU t" PACKAGE " " VERSION "%s"
223 "\n (C) 1998-2005 Gerald Combs <gerald@ethereal.com>"
226 svnversion, comp_info_str->str, runtime_info_str->str);
231 fprintf(output, "\nt%s [ -vh ] [ -DlLnpqSVx ] [ -a <capture autostop condition> ] ...\n",
233 fprintf(output, "\t[ -b <capture ring buffer option> ] ... [ -c <capture packet count> ]\n");
234 fprintf(output, "\t[ -d %s ] ...\n", decode_as_arg_template);
235 fprintf(output, "\t[ -f <capture filter> ] [ -F <output file type> ] [ -i <capture interface> ]\n");
236 fprintf(output, "\t[ -N <name resolving flags> ] [ -o <preference setting> ] ... [ -r <infile> ]\n");
237 fprintf(output, "\t[ -R <read (display) filter> ] [ -s <capture snaplen> ] [ -t <time stamp format> ]\n");
238 fprintf(output, "\t[ -T pdml|ps|psml|text ] [ -w <savefile> ] [ -y <capture link type> ]\n");
239 fprintf(output, "\t[ -z <statistics ]\n");
241 fprintf(output, "\nt%s [ -vh ] [ -lnVx ]\n", PACKAGE);
242 fprintf(output, "\t[ -d %s ] ...\n", decode_as_arg_template);
243 fprintf(output, "\t[ -F <output file type> ] [ -N <name resolving flags> ]\n");
244 fprintf(output, "\t[ -o <preference setting> ] ... [ -r <infile> ] [ -R <read (display) filter> ]\n");
245 fprintf(output, "\t[ -t <time stamp format> ] [ -T pdml|ps|psml|text ] [ -w <savefile> ]\n");
246 fprintf(output, "\t[ -z <statistics ]\n");
248 fprintf(output, "Valid file type arguments to the \"-F\" flag:\n");
249 for (i = 0; i < WTAP_NUM_FILE_TYPES; i++) {
250 if (wtap_dump_can_open(i))
251 fprintf(output, "\t%s - %s\n",
252 wtap_file_type_short_string(i), wtap_file_type_string(i));
254 fprintf(output, "\tdefault is libpcap\n");
258 * For a dissector table, print on the stream described by output,
259 * its short name (which is what's used in the "-d" option) and its
263 display_dissector_table_names(char *table_name, const char *ui_name,
266 fprintf((FILE *)output, "\t%s (%s)\n", table_name, ui_name);
270 * For a dissector handle, print on the stream described by output,
271 * the filter name (which is what's used in the "-d" option) and the full
272 * name for the protocol that corresponds to this handle.
275 display_dissector_names(const gchar *table _U_, gpointer handle, gpointer output)
278 const gchar* proto_filter_name;
279 const gchar* proto_ui_name;
281 proto_id = dissector_handle_get_protocol_index((dissector_handle_t)handle);
283 if (proto_id != -1) {
284 proto_filter_name = proto_get_protocol_filter_name(proto_id);
285 proto_ui_name = proto_get_protocol_name(proto_id);
286 g_assert(proto_filter_name != NULL);
287 g_assert(proto_ui_name != NULL);
289 fprintf((FILE *)output, "\t%s (%s)\n",
296 * The protocol_name_search structure is used by find_protocol_name_func()
297 * to pass parameters and store results
299 struct protocol_name_search{
300 gchar *searched_name; /* Protocol filter name we are looking for */
301 dissector_handle_t matched_handle; /* Handle for a dissector whose protocol has the specified filter name */
302 guint nb_match; /* How many dissectors matched searched_name */
304 typedef struct protocol_name_search *protocol_name_search_t;
307 * This function parses all dissectors associated with a table to find the
308 * one whose protocol has the specified filter name. It is called
309 * as a reference function in a call to dissector_table_foreach_handle.
310 * The name we are looking for, as well as the results, are stored in the
311 * protocol_name_search struct pointed to by user_data.
312 * If called using dissector_table_foreach_handle, we actually parse the
313 * whole list of dissectors.
316 find_protocol_name_func(const gchar *table _U_, gpointer handle, gpointer user_data)
320 const gchar *protocol_filter_name;
321 protocol_name_search_t search_info;
325 search_info = (protocol_name_search_t)user_data;
327 proto_id = dissector_handle_get_protocol_index((dissector_handle_t)handle);
328 if (proto_id != -1) {
329 protocol_filter_name = proto_get_protocol_filter_name(proto_id);
330 g_assert(protocol_filter_name != NULL);
331 if (strcmp(protocol_filter_name, search_info->searched_name) == 0) {
333 if (search_info->nb_match == 0) {
334 /* Record this handle only if this is the first match */
335 search_info->matched_handle = (dissector_handle_t)handle; /* Record the handle for this matching dissector */
337 search_info->nb_match++;
343 * Print all layer type names supported.
344 * We send the output to the stream described by the handle output.
348 fprint_all_layer_types(FILE *output)
351 dissector_all_tables_foreach_table(display_dissector_table_names, (gpointer)output);
355 * Print all protocol names supported for a specific layer type.
356 * table_name contains the layer type name in which the search is performed.
357 * We send the output to the stream described by the handle output.
361 fprint_all_protocols_for_layer_types(FILE *output, gchar *table_name)
364 dissector_table_foreach_handle(table_name,
365 display_dissector_names,
370 * The function below parses the command-line parameters for the decode as
371 * feature (a string pointer by cl_param).
372 * It checks the format of the command-line, searches for a matching table
373 * and dissector. If a table/dissector match is not found, we display a
374 * summary of the available tables/dissectors (on stderr) and return FALSE.
375 * If everything is fine, we get the "Decode as" preference activated,
376 * then we return TRUE.
379 add_decode_as(const gchar *cl_param)
383 gchar *decoded_param;
384 gchar *remaining_param;
386 gchar *dissector_str;
387 dissector_handle_t dissector_matching;
388 dissector_table_t table_matching;
389 ftenum_t dissector_table_selector_type;
390 struct protocol_name_search user_protocol_name;
392 /* The following code will allocate and copy the command-line options in a string pointed by decoded_param */
395 decoded_param = g_malloc( sizeof(gchar) * (strlen(cl_param) + 1) ); /* Allocate enough space to have a working copy of the command-line parameter */
396 g_assert(decoded_param);
397 strcpy(decoded_param, cl_param);
400 /* The lines below will parse this string (modifying it) to extract all
401 necessary information. Note that decoded_param is still needed since
402 strings are not copied - we just save pointers. */
404 /* This section extracts a layer type (table_name) from decoded_param */
405 table_name = decoded_param; /* Layer type string starts from beginning */
407 remaining_param = strchr(table_name, '=');
408 if (remaining_param == NULL) {
409 fprintf(stderr, "tethereal: Parameter \"%s\" doesn't follow the template \"%s\"\n", cl_param, decode_as_arg_template);
410 /* If the argument does not follow the template, carry on anyway to check
411 if the table name is at least correct. If remaining_param is NULL,
412 we'll exit anyway further down */
415 *remaining_param = '\0'; /* Terminate the layer type string (table_name) where '=' was detected */
418 /* Remove leading and trailing spaces from the table name */
419 while ( table_name[0] == ' ' )
421 while ( table_name[strlen(table_name) - 1] == ' ' )
422 table_name[strlen(table_name) - 1] = '\0'; /* Note: if empty string, while loop will eventually exit */
424 /* The following part searches a table matching with the layer type specified */
425 table_matching = NULL;
427 /* Look for the requested table */
428 if ( !(*(table_name)) ) { /* Is the table name empty, if so, don't even search for anything, display a message */
429 fprintf(stderr, "tethereal: No layer type specified\n"); /* Note, we don't exit here, but table_matching will remain NULL, so we exit below */
432 table_matching = find_dissector_table(table_name);
433 if (!table_matching) {
434 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 */
438 if (!table_matching) {
439 /* Display a list of supported layer types to help the user, if the
440 specified layer type was not found */
441 fprintf(stderr, "tethereal: Valid layer types are:\n");
442 fprint_all_layer_types(stderr);
444 if (remaining_param == NULL || !table_matching) {
445 /* Exit if the layer type was not found, or if no '=' separator was found
447 g_free(decoded_param);
451 if (*(remaining_param + 1) != '=') { /* Check for "==" and not only '=' */
452 fprintf(stderr, "tethereal: WARNING: -d requires \"==\" instead of \"=\". Option will be treated as \"%s==%s\"\n", table_name, remaining_param + 1);
455 remaining_param++; /* Move to the second '=' */
456 *remaining_param = '\0'; /* Remove the second '=' */
458 remaining_param++; /* Position after the layer type string */
460 /* This section extracts a selector value (selector_str) from decoded_param */
462 selector_str = remaining_param; /* Next part starts with the selector number */
464 remaining_param = strchr(selector_str, ',');
465 if (remaining_param == NULL) {
466 fprintf(stderr, "tethereal: Parameter \"%s\" doesn't follow the template \"%s\"\n", cl_param, decode_as_arg_template);
467 /* If the argument does not follow the template, carry on anyway to check
468 if the selector value is at least correct. If remaining_param is NULL,
469 we'll exit anyway further down */
472 *remaining_param = '\0'; /* Terminate the selector number string (selector_str) where ',' was detected */
475 dissector_table_selector_type = get_dissector_table_selector_type(table_name);
477 switch (dissector_table_selector_type) {
483 /* The selector for this table is an unsigned number. Parse it as such.
484 There's no need to remove leading and trailing spaces from the
485 selector number string, because sscanf will do that for us. */
486 if ( sscanf(selector_str, "%u", &selector) != 1 ) {
487 fprintf(stderr, "tethereal: Invalid selector number \"%s\"\n", selector_str);
488 g_free(decoded_param);
495 /* The selector for this table is a string. */
499 /* There are currently no dissector tables with any types other
500 than the ones listed above. */
501 g_assert_not_reached();
504 if (remaining_param == NULL) {
505 /* Exit if no ',' separator was found (see above) */
506 fprintf(stderr, "tethereal: Valid protocols for layer type \"%s\" are:\n", table_name);
507 fprint_all_protocols_for_layer_types(stderr, table_name);
508 g_free(decoded_param);
512 remaining_param++; /* Position after the selector number string */
514 /* This section extracts a protocol filter name (dissector_str) from decoded_param */
516 dissector_str = remaining_param; /* All the rest of the string is the dissector (decode as protocol) name */
518 /* Remove leading and trailing spaces from the dissector name */
519 while ( dissector_str[0] == ' ' )
521 while ( dissector_str[strlen(dissector_str) - 1] == ' ' )
522 dissector_str[strlen(dissector_str) - 1] = '\0'; /* Note: if empty string, while loop will eventually exit */
524 dissector_matching = NULL;
526 /* We now have a pointer to the handle for the requested table inside the variable table_matching */
527 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 */
528 fprintf(stderr, "tethereal: No protocol name specified\n"); /* Note, we don't exit here, but dissector_matching will remain NULL, so we exit below */
531 user_protocol_name.nb_match = 0;
532 user_protocol_name.searched_name = dissector_str;
533 user_protocol_name.matched_handle = NULL;
535 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 */
537 if (user_protocol_name.nb_match != 0) {
538 dissector_matching = user_protocol_name.matched_handle;
539 if (user_protocol_name.nb_match > 1) {
540 fprintf(stderr, "tethereal: WARNING: Protocol \"%s\" matched %u dissectors, first one will be used\n", dissector_str, user_protocol_name.nb_match);
544 /* OK, check whether the problem is that there isn't any such
545 protocol, or that there is but it's not specified as a protocol
546 that's valid for that dissector table.
547 Note, we don't exit here, but dissector_matching will remain NULL,
549 if (proto_get_id_by_filter_name(dissector_str) == -1) {
550 /* No such protocol */
551 fprintf(stderr, "tethereal: Unknown protocol -- \"%s\"\n", dissector_str);
553 fprintf(stderr, "tethereal: Protocol \"%s\" isn't valid for layer type \"%s\"\n",
554 dissector_str, table_name);
559 if (!dissector_matching) {
560 fprintf(stderr, "tethereal: Valid protocols for layer type \"%s\" are:\n", table_name);
561 fprint_all_protocols_for_layer_types(stderr, table_name);
562 g_free(decoded_param);
566 /* This is the end of the code that parses the command-line options.
567 All information is now stored in the variables:
571 The above variables that are strings are still pointing to areas within
572 decoded_parm. decoded_parm thus still needs to be kept allocated in
573 until we stop needing these variables
574 decoded_param will be deallocated at each exit point of this function */
577 /* We now have a pointer to the handle for the requested dissector
578 (requested protocol) inside the variable dissector_matching */
579 switch (dissector_table_selector_type) {
585 /* The selector for this table is an unsigned number. */
586 dissector_change(table_name, selector, dissector_matching);
591 /* The selector for this table is a string. */
592 dissector_change_string(table_name, selector_str, dissector_matching);
596 /* There are currently no dissector tables with any types other
597 than the ones listed above. */
598 g_assert_not_reached();
600 g_free(decoded_param); /* "Decode As" rule has been succesfully added */
605 main(int argc, char *argv[])
609 gboolean arg_error = FALSE;
615 char *gpf_path, *pf_path;
616 char *gdp_path, *dp_path;
617 int gpf_open_errno, gpf_read_errno;
618 int pf_open_errno, pf_read_errno;
619 int gdp_open_errno, gdp_read_errno;
620 int dp_open_errno, dp_read_errno;
623 gboolean capture_filter_specified = FALSE;
624 GList *if_list, *if_entry;
628 gchar err_str[PCAP_ERRBUF_SIZE];
629 gchar *cant_get_if_list_errstr;
630 gboolean list_link_layer_types = FALSE;
632 gboolean capture_option_specified = FALSE;
634 gboolean quiet = FALSE;
635 gchar *save_file = NULL;
636 int out_file_type = WTAP_FILE_PCAP;
637 gchar *cf_name = NULL, *rfilter = NULL;
639 gboolean start_capture = FALSE;
641 GList *lt_list, *lt_entry;
642 data_link_info_t *data_link_info;
644 #ifdef HAVE_PCAP_OPEN_DEAD
645 struct bpf_program fcode;
647 dfilter_t *rfcode = NULL;
651 /* initialize memory allocation subsystem */
656 capture_opts_init(&capture_opts, NULL /* cfile */);
659 set_timestamp_setting(TS_RELATIVE);
661 /* Register all dissectors; we must do this before checking for the
662 "-G" flag, as the "-G" flag dumps information registered by the
663 dissectors, and we must do it before we read the preferences, in
664 case any dissectors register preferences. */
665 epan_init(PLUGIN_DIR,register_all_protocols,register_all_protocol_handoffs,
666 failure_message,open_failure_message,read_failure_message);
668 /* Register all tap listeners; we do this before we parse the arguments,
669 as the "-z" argument can specify a registered tap. */
671 /* we register the plugin taps before the other taps because
672 stats_tree taps plugins will be registered as tap listeners
673 by stats_tree_stat.c and need to registered before that */
675 register_all_plugin_tap_listeners();
677 register_all_tap_listeners();
679 /* Now register the preferences for any non-dissector modules.
680 We must do that before we read the preferences as well. */
681 prefs_register_modules();
683 /* If invoked with the "-G" flag, we dump out information based on
684 the argument to the "-G" flag; if no argument is specified,
685 for backwards compatibility we dump out a glossary of display
688 We do this here to mirror what happens in the GTK+ version, although
689 it's not necessary here. */
690 handle_dashG_option(argc, argv, "tethereal");
692 /* Set the C-language locale to the native environment. */
693 setlocale(LC_ALL, "");
695 prefs = read_prefs(&gpf_open_errno, &gpf_read_errno, &gpf_path,
696 &pf_open_errno, &pf_read_errno, &pf_path);
697 if (gpf_path != NULL) {
698 if (gpf_open_errno != 0) {
699 fprintf(stderr, "Can't open global preferences file \"%s\": %s.\n",
700 pf_path, strerror(gpf_open_errno));
702 if (gpf_read_errno != 0) {
703 fprintf(stderr, "I/O error reading global preferences file \"%s\": %s.\n",
704 pf_path, strerror(gpf_read_errno));
707 if (pf_path != NULL) {
708 if (pf_open_errno != 0) {
709 fprintf(stderr, "Can't open your preferences file \"%s\": %s.\n", pf_path,
710 strerror(pf_open_errno));
712 if (pf_read_errno != 0) {
713 fprintf(stderr, "I/O error reading your preferences file \"%s\": %s.\n",
714 pf_path, strerror(pf_read_errno));
720 /* Set the name resolution code's flags from the preferences. */
721 g_resolv_flags = prefs->name_resolve;
723 /* Read the disabled protocols file. */
724 read_disabled_protos_list(&gdp_path, &gdp_open_errno, &gdp_read_errno,
725 &dp_path, &dp_open_errno, &dp_read_errno);
726 if (gdp_path != NULL) {
727 if (gdp_open_errno != 0) {
729 "Could not open global disabled protocols file\n\"%s\": %s.\n",
730 gdp_path, strerror(gdp_open_errno));
732 if (gdp_read_errno != 0) {
734 "I/O error reading global disabled protocols file\n\"%s\": %s.\n",
735 gdp_path, strerror(gdp_read_errno));
739 if (dp_path != NULL) {
740 if (dp_open_errno != 0) {
742 "Could not open your disabled protocols file\n\"%s\": %s.\n", dp_path,
743 strerror(dp_open_errno));
745 if (dp_read_errno != 0) {
747 "I/O error reading your disabled protocols file\n\"%s\": %s.\n", dp_path,
748 strerror(dp_read_errno));
754 /* Load Wpcap, if possible */
758 init_cap_file(&cfile);
760 /* Assemble the compile-time version information string */
761 comp_info_str = g_string_new("Compiled ");
762 get_compiled_version_info(comp_info_str);
764 /* Assemble the run-time version information string */
765 runtime_info_str = g_string_new("Running ");
766 get_runtime_version_info(runtime_info_str);
768 /* Print format defaults to this. */
769 print_format = PR_FMT_TEXT;
771 /* Now get our args */
772 while ((opt = getopt(argc, argv, "a:b:c:d:Df:F:hi:lLnN:o:pqr:R:s:St:T:vw:Vxy:z:")) != -1) {
774 case 'a': /* autostop criteria */
775 case 'b': /* Ringbuffer option */
776 case 'c': /* Capture xxx packets */
777 case 'f': /* capture filter */
778 case 'p': /* Don't capture in promiscuous mode */
779 case 's': /* Set the snapshot (capture) length */
780 case 'y': /* Set the pcap data link type */
782 capture_opts_add_opt(&capture_opts, "tethereal", opt, optarg, &start_capture);
784 capture_option_specified = TRUE;
788 case 'd': /* Decode as rule */
789 if (!add_decode_as(optarg))
792 case 'D': /* Print a list of capture devices */
794 if_list = get_interface_list(&err, err_str);
795 if (if_list == NULL) {
798 case CANT_GET_INTERFACE_LIST:
799 cant_get_if_list_errstr =
800 cant_get_if_list_error_message(err_str);
801 fprintf(stderr, "tethereal: %s\n", cant_get_if_list_errstr);
802 g_free(cant_get_if_list_errstr);
805 case NO_INTERFACES_FOUND:
806 fprintf(stderr, "tethereal: There are no interfaces on which a capture can be done\n");
811 i = 1; /* Interface id number */
812 for (if_entry = g_list_first(if_list); if_entry != NULL;
813 if_entry = g_list_next(if_entry)) {
814 if_info = if_entry->data;
815 printf("%d. %s", i++, if_info->name);
816 if (if_info->description != NULL)
817 printf(" (%s)", if_info->description);
820 free_interface_list(if_list);
823 capture_option_specified = TRUE;
828 out_file_type = wtap_short_string_to_file_type(optarg);
829 if (out_file_type < 0) {
830 fprintf(stderr, "tethereal: \"%s\" isn't a valid capture file type\n",
835 case 'h': /* Print help and exit */
839 case 'i': /* Use interface xxx */
842 * If the argument is a number, treat it as an index into the list
843 * of adapters, as printed by "tethereal -D".
845 * This should be OK on UNIX systems, as interfaces shouldn't have
846 * names that begin with digits. It can be useful on Windows, where
847 * more than one interface can have the same name.
849 adapter_index = strtol(optarg, &p, 10);
850 if (p != NULL && *p == '\0') {
851 if (adapter_index < 0) {
853 "tethereal: The specified adapter index is a negative number\n");
856 if (adapter_index > INT_MAX) {
858 "tethereal: The specified adapter index is too large (greater than %d)\n",
862 if (adapter_index == 0) {
863 fprintf(stderr, "tethereal: there is no interface with that adapter index\n");
866 if_list = get_interface_list(&err, err_str);
867 if (if_list == NULL) {
870 case CANT_GET_INTERFACE_LIST:
871 cant_get_if_list_errstr =
872 cant_get_if_list_error_message(err_str);
873 fprintf(stderr, "tethereal: %s\n", cant_get_if_list_errstr);
874 g_free(cant_get_if_list_errstr);
877 case NO_INTERFACES_FOUND:
878 fprintf(stderr, "tethereal: There are no interfaces on which a capture can be done\n");
883 if_info = g_list_nth_data(if_list, adapter_index - 1);
884 if (if_info == NULL) {
885 fprintf(stderr, "tethereal: there is no interface with that adapter index\n");
888 capture_opts.iface = g_strdup(if_info->name);
889 free_interface_list(if_list);
891 capture_opts.iface = g_strdup(optarg);
893 capture_option_specified = TRUE;
897 case 'l': /* "Line-buffer" standard output */
898 /* This isn't line-buffering, strictly speaking, it's just
899 flushing the standard output after the information for
900 each packet is printed; however, that should be good
901 enough for all the purposes to which "-l" is put (and
902 is probably actually better for "-V", as it does fewer
905 See the comment in "process_packet()" for an explanation of
906 why we do that, and why we don't just use "setvbuf()" to
907 make the standard output line-buffered (short version: in
908 Windows, "line-buffered" is the same as "fully-buffered",
909 and the output buffer is only flushed when it fills up). */
910 line_buffered = TRUE;
912 case 'L': /* Print list of link-layer types and exit */
914 list_link_layer_types = TRUE;
917 capture_option_specified = TRUE;
921 case 'n': /* No name resolution */
922 g_resolv_flags = RESOLV_NONE;
924 case 'N': /* Select what types of addresses/port #s to resolve */
925 if (g_resolv_flags == RESOLV_ALL)
926 g_resolv_flags = RESOLV_NONE;
927 badopt = string_to_name_resolve(optarg, &g_resolv_flags);
928 if (badopt != '\0') {
929 fprintf(stderr, "tethereal: -N specifies unknown resolving option '%c'; valid options are 'm', 'n', and 't'\n",
934 case 'o': /* Override preference from command line */
935 switch (prefs_set_pref(optarg)) {
937 case PREFS_SET_SYNTAX_ERR:
938 fprintf(stderr, "tethereal: Invalid -o flag \"%s\"\n", optarg);
942 case PREFS_SET_NO_SUCH_PREF:
943 case PREFS_SET_OBSOLETE:
944 fprintf(stderr, "tethereal: -o flag \"%s\" specifies unknown preference\n",
950 case 'q': /* Quiet */
953 case 'r': /* Read capture file xxx */
954 cf_name = g_strdup(optarg);
956 case 'R': /* Read file filter */
959 case 'S': /* show packets in real time */
960 print_packet_info = TRUE;
962 case 't': /* Time stamp type */
963 if (strcmp(optarg, "r") == 0)
964 set_timestamp_setting(TS_RELATIVE);
965 else if (strcmp(optarg, "a") == 0)
966 set_timestamp_setting(TS_ABSOLUTE);
967 else if (strcmp(optarg, "ad") == 0)
968 set_timestamp_setting(TS_ABSOLUTE_WITH_DATE);
969 else if (strcmp(optarg, "d") == 0)
970 set_timestamp_setting(TS_DELTA);
972 fprintf(stderr, "tethereal: Invalid time stamp type \"%s\"\n",
974 fprintf(stderr, "It must be \"r\" for relative, \"a\" for absolute,\n");
975 fprintf(stderr, "\"ad\" for absolute with date, or \"d\" for delta.\n");
979 case 'T': /* printing Type */
980 if (strcmp(optarg, "text") == 0) {
981 output_action = WRITE_TEXT;
982 print_format = PR_FMT_TEXT;
983 } else if (strcmp(optarg, "ps") == 0) {
984 output_action = WRITE_TEXT;
985 print_format = PR_FMT_PS;
986 } else if (strcmp(optarg, "pdml") == 0) {
987 output_action = WRITE_XML;
989 } else if (strcmp(optarg, "psml") == 0) {
990 output_action = WRITE_XML;
993 fprintf(stderr, "tethereal: Invalid -T parameter.\n");
994 fprintf(stderr, "It must be \"ps\", \"text\", \"pdml\", or \"psml\".\n");
998 case 'v': /* Show version and exit */
999 printf("t" PACKAGE " " VERSION "%s\n%s\n%s\n",
1000 svnversion, comp_info_str->str, runtime_info_str->str);
1003 case 'w': /* Write to capture file xxx */
1004 save_file = g_strdup(optarg);
1006 case 'V': /* Verbose */
1009 case 'x': /* Print packet data in hex (and ASCII) */
1013 /* We won't call the init function for the stat this soon
1014 as it would disallow MATE's fields (which are registered
1015 by the preferences set callback) from being used as
1016 part of a tap filter. Instead, we just add the argument
1017 to a list of stat arguments. */
1018 if (!process_stat_cmd_arg(optarg)) {
1019 fprintf(stderr,"tethereal: invalid -z argument.\n");
1020 fprintf(stderr," -z argument must be one of :\n");
1021 list_stat_cmd_args();
1026 case '?': /* Bad flag - print usage message */
1032 /* If no capture filter or read filter has been specified, and there are
1033 still command-line arguments, treat them as the tokens of a capture
1034 filter (if no "-r" flag was specified) or a read filter (if a "-r"
1035 flag was specified. */
1036 if (optind < argc) {
1037 if (cf_name != NULL) {
1038 if (rfilter != NULL) {
1040 "tethereal: Read filters were specified both with \"-R\" and with additional command-line arguments\n");
1043 rfilter = get_args_as_string(argc, argv, optind);
1046 if (capture_filter_specified) {
1048 "tethereal: Capture filters were specified both with \"-f\" and with additional command-line arguments\n");
1051 capture_opts.cfilter = get_args_as_string(argc, argv, optind);
1053 capture_option_specified = TRUE;
1058 /* See if we're writing a capture file and the file is a pipe */
1060 ld.output_to_pipe = FALSE;
1062 if (save_file != NULL) {
1063 /* We're writing to a capture file. */
1064 if (strcmp(save_file, "-") == 0) {
1065 /* Write to the standard output. */
1067 save_file = g_strdup("");
1069 /* XXX - should we check whether it's a pipe? It's arguably
1070 silly to do "-w - >output_file" rather than "-w output_file",
1071 but by not checking we might be violating the Principle Of
1072 Least Astonishment. */
1073 ld.output_to_pipe = TRUE;
1078 err = test_for_fifo(save_file);
1081 case ENOENT: /* it doesn't exist, so we'll be creating it,
1082 and it won't be a FIFO */
1083 case 0: /* found it, but it's not a FIFO */
1086 case ESPIPE: /* it is a FIFO */
1087 ld.output_to_pipe = TRUE;
1090 default: /* couldn't stat it */
1092 "tethereal: Error testing whether capture file is a pipe: %s\n",
1099 /* We're not writing to a file, so we should print packet information
1100 unless "-q" was specified. */
1102 print_packet_info = TRUE;
1105 #ifndef HAVE_LIBPCAP
1106 if (capture_option_specified)
1107 fprintf(stderr, "This version of Tethereal was not built with support for capturing packets.\n");
1114 /* We don't support capture filters when reading from a capture file
1115 (the BPF compiler doesn't support all link-layer types that we
1116 support in capture files we read). */
1118 if (cf_name != NULL) {
1119 if (capture_filter_specified) {
1121 "tethereal: Only read filters, not capture filters, can be specified when reading a capture file.\n");
1128 if (output_action != WRITE_TEXT) {
1129 fprintf(stderr, "tethereal: Raw packet hex data can only be printed as text or PostScript\n");
1135 if (list_link_layer_types) {
1136 /* We're supposed to list the link-layer types for an interface;
1137 did the user also specify a capture file to be read? */
1139 /* Yes - that's bogus. */
1140 fprintf(stderr, "tethereal: You can't specify -L and a capture file to be read.\n");
1143 /* No - did they specify a ring buffer option? */
1144 if (capture_opts.multi_files_on) {
1145 fprintf(stderr, "tethereal: Ring buffer requested, but a capture isn't being done.\n");
1149 /* If they didn't specify a "-w" flag, but specified a maximum capture
1150 file size, tell them that this doesn't work, and exit. */
1151 if (capture_opts.has_autostop_filesize && save_file == NULL) {
1152 fprintf(stderr, "tethereal: Maximum capture file size specified, but "
1153 "capture isn't being saved to a file.\n");
1157 if (capture_opts.multi_files_on) {
1158 /* Ring buffer works only under certain conditions:
1159 a) ring buffer does not work if you're not saving the capture to
1161 b) ring buffer only works if you're saving in libpcap format;
1162 c) it makes no sense to enable the ring buffer if the maximum
1163 file size is set to "infinite";
1164 d) file must not be a pipe. */
1165 if (save_file == NULL) {
1166 fprintf(stderr, "tethereal: Ring buffer requested, but "
1167 "capture isn't being saved to a file.\n");
1170 if (out_file_type != WTAP_FILE_PCAP) {
1171 fprintf(stderr, "tethereal: Ring buffer requested, but "
1172 "capture isn't being saved in libpcap format.\n");
1175 if (!capture_opts.has_autostop_filesize) {
1176 fprintf(stderr, "tethereal: Ring buffer requested, but "
1177 "no maximum capture file size was specified.\n");
1180 if (ld.output_to_pipe) {
1181 fprintf(stderr, "tethereal: Ring buffer requested, but "
1182 "capture file is a pipe.\n");
1190 /* Start windows sockets */
1191 WSAStartup( MAKEWORD( 1, 1 ), &wsaData );
1194 /* Notify all registered modules that have had any of their preferences
1195 changed either from one of the preferences file or from the command
1196 line that their preferences have changed. */
1199 /* At this point MATE will have registered its field array so we can
1200 have a tap filter with one of MATE's late-registered fields as part
1201 of the filter. We can now process all the "-z" arguments. */
1202 start_requested_stats();
1204 /* disabled protocols as per configuration file */
1205 if (gdp_path == NULL && dp_path == NULL) {
1206 set_disabled_protos_list();
1209 /* Build the column format array */
1210 col_setup(&cfile.cinfo, prefs->num_cols);
1211 for (i = 0; i < cfile.cinfo.num_cols; i++) {
1212 cfile.cinfo.col_fmt[i] = get_column_format(i);
1213 cfile.cinfo.col_title[i] = g_strdup(get_column_title(i));
1214 cfile.cinfo.fmt_matx[i] = (gboolean *) g_malloc0(sizeof(gboolean) *
1216 get_column_format_matches(cfile.cinfo.fmt_matx[i], cfile.cinfo.col_fmt[i]);
1217 cfile.cinfo.col_data[i] = NULL;
1218 if (cfile.cinfo.col_fmt[i] == COL_INFO)
1219 cfile.cinfo.col_buf[i] = (gchar *) g_malloc(sizeof(gchar) * COL_MAX_INFO_LEN);
1221 cfile.cinfo.col_buf[i] = (gchar *) g_malloc(sizeof(gchar) * COL_MAX_LEN);
1222 cfile.cinfo.col_fence[i] = 0;
1223 cfile.cinfo.col_expr[i] = (gchar *) g_malloc(sizeof(gchar) * COL_MAX_LEN);
1224 cfile.cinfo.col_expr_val[i] = (gchar *) g_malloc(sizeof(gchar) * COL_MAX_LEN);
1227 for (i = 0; i < cfile.cinfo.num_cols; i++) {
1230 for (j = 0; j < NUM_COL_FMTS; j++) {
1231 if (!cfile.cinfo.fmt_matx[i][j])
1234 if (cfile.cinfo.col_first[j] == -1)
1235 cfile.cinfo.col_first[j] = i;
1236 cfile.cinfo.col_last[j] = i;
1241 if (capture_opts.snaplen < 1)
1242 capture_opts.snaplen = WTAP_MAX_PACKET_SIZE;
1243 else if (capture_opts.snaplen < MIN_PACKET_SIZE)
1244 capture_opts.snaplen = MIN_PACKET_SIZE;
1246 /* Check the value range of the ring_num_files parameter */
1247 if (capture_opts.ring_num_files > RINGBUFFER_MAX_NUM_FILES)
1248 capture_opts.ring_num_files = RINGBUFFER_MAX_NUM_FILES;
1249 #if RINGBUFFER_MIN_NUM_FILES > 0
1250 else if (capture_opts.ring_num_files < RINGBUFFER_MIN_NUM_FILES)
1251 capture_opts.ring_num_files = RINGBUFFER_MIN_NUM_FILES;
1255 if (rfilter != NULL) {
1256 if (!dfilter_compile(rfilter, &rfcode)) {
1257 fprintf(stderr, "tethereal: %s\n", dfilter_error_msg);
1259 #ifdef HAVE_PCAP_OPEN_DEAD
1263 pc = pcap_open_dead(DLT_EN10MB, MIN_PACKET_SIZE);
1265 if (pcap_compile(pc, &fcode, rfilter, 0, 0) != -1) {
1267 " Note: That display filter code looks like a valid capture filter;\n"
1268 " maybe you mixed them up?\n");
1277 cfile.rfcode = rfcode;
1279 if (print_packet_info) {
1280 /* If we're printing as text or PostScript, we have
1281 to create a print stream. */
1282 if (output_action == WRITE_TEXT) {
1283 switch (print_format) {
1286 print_stream = print_stream_text_stdio_new(stdout);
1290 print_stream = print_stream_ps_stdio_new(stdout);
1294 g_assert_not_reached();
1299 /* We have to dissect each packet if:
1301 we're printing information about each packet;
1303 we're using a read filter on the packets;
1305 we're using any taps. */
1306 do_dissection = print_packet_info || rfcode || have_tap_listeners();
1310 * We're reading a capture file.
1315 * Immediately relinquish any set-UID or set-GID privileges we have;
1316 * we must not be allowed to read any capture files the user running
1317 * Tethereal can't open.
1323 if (cf_open(&cfile, cf_name, FALSE, &err) != CF_OK) {
1327 err = load_cap_file(&cfile, save_file, out_file_type);
1334 /* No capture file specified, so we're supposed to do a live capture
1335 (or get a list of link-layer types for a live capture device);
1336 do we have support for live captures? */
1341 fprintf(stderr, "tethereal: Could not load wpcap.dll.\n");
1346 /* Yes; did the user specify an interface to use? */
1347 if (capture_opts.iface == NULL) {
1348 /* No - is a default specified in the preferences file? */
1349 if (prefs->capture_device != NULL) {
1351 if_text = strrchr(prefs->capture_device, ' ');
1352 if (if_text == NULL) {
1353 capture_opts.iface = g_strdup(prefs->capture_device);
1355 capture_opts.iface = g_strdup(if_text + 1); /* Skip over space */
1358 /* No - pick the first one from the list of interfaces. */
1359 if_list = get_interface_list(&err, err_str);
1360 if (if_list == NULL) {
1363 case CANT_GET_INTERFACE_LIST:
1364 cant_get_if_list_errstr =
1365 cant_get_if_list_error_message(err_str);
1366 fprintf(stderr, "tethereal: %s\n", cant_get_if_list_errstr);
1367 g_free(cant_get_if_list_errstr);
1370 case NO_INTERFACES_FOUND:
1371 fprintf(stderr, "tethereal: There are no interfaces on which a capture can be done\n");
1376 if_info = if_list->data; /* first interface */
1377 capture_opts.iface = g_strdup(if_info->name);
1378 free_interface_list(if_list);
1382 if (list_link_layer_types) {
1383 /* We were asked to list the link-layer types for an interface.
1384 Get the list of link-layer types for the capture device. */
1385 lt_list = get_pcap_linktype_list(capture_opts.iface, err_str);
1386 if (lt_list == NULL) {
1387 if (err_str[0] != '\0') {
1388 fprintf(stderr, "tethereal: The list of data link types for the capture device could not be obtained (%s).\n"
1389 "Please check to make sure you have sufficient permissions, and that\n"
1390 "you have the proper interface or pipe specified.\n", err_str);
1392 fprintf(stderr, "tethereal: The capture device has no data link types.\n");
1395 fprintf(stderr, "Data link types (use option -y to set):\n");
1396 for (lt_entry = lt_list; lt_entry != NULL;
1397 lt_entry = g_list_next(lt_entry)) {
1398 data_link_info = lt_entry->data;
1399 fprintf(stderr, " %s", data_link_info->name);
1400 if (data_link_info->description != NULL)
1401 fprintf(stderr, " (%s)", data_link_info->description);
1403 fprintf(stderr, " (not supported)");
1406 free_pcap_linktype_list(lt_list);
1412 * The user didn't ask us not to print a count of packets as
1413 * they arrive, so do so.
1415 print_packet_counts = TRUE;
1418 capture(save_file, out_file_type);
1420 if (capture_opts.multi_files_on) {
1424 /* No - complain. */
1425 fprintf(stderr, "This version of Tethereal was not built with support for capturing packets.\n");
1430 draw_tap_listeners(TRUE);
1437 /* Do the low-level work of a capture.
1438 Returns TRUE if it succeeds, FALSE otherwise. */
1440 static condition *volatile cnd_ring_timeout = NULL; /* this must be visible in process_packet */
1443 capture(char *save_file, int out_file_type)
1447 gchar open_err_str[PCAP_ERRBUF_SIZE];
1448 gchar lookup_net_err_str[PCAP_ERRBUF_SIZE];
1449 bpf_u_int32 netnum, netmask;
1450 struct bpf_program fcode;
1451 const char *set_linktype_err_str;
1453 int volatile volatile_err = 0;
1454 int volatile inpkts = 0;
1456 char errmsg[1024+1];
1457 condition *volatile cnd_stop_capturesize = NULL;
1458 condition *volatile cnd_stop_timeout = NULL;
1461 void (*oldhandler)(int);
1462 static const char ppamsg[] = "can't find PPA for ";
1463 const char *libpcap_warn;
1464 volatile int pipe_fd = -1;
1465 struct pcap_hdr hdr;
1466 struct pcaprec_modified_hdr rechdr;
1467 guchar pcap_data[WTAP_MAX_PACKET_SIZE];
1469 struct pcap_stat stats;
1472 dfilter_t *rfcode = NULL;
1475 /* Initialize all data structures used for dissection. */
1478 ld.linktype = WTAP_ENCAP_UNKNOWN;
1481 /* Open the network interface to capture from it.
1482 Some versions of libpcap may put warnings into the error buffer
1483 if they succeed; to tell if that's happened, we have to clear
1484 the error buffer, and check if it's still a null string. */
1485 open_err_str[0] = '\0';
1486 ld.pch = pcap_open_live(capture_opts.iface, capture_opts.snaplen,
1487 capture_opts.promisc_mode, 1000, open_err_str);
1489 if (ld.pch != NULL) {
1490 /* setting the data link type only works on real interfaces */
1491 if (capture_opts.linktype != -1) {
1492 set_linktype_err_str = set_pcap_linktype(ld.pch, capture_opts.iface,
1493 capture_opts.linktype);
1494 if (set_linktype_err_str != NULL) {
1495 g_snprintf(errmsg, sizeof errmsg, "Unable to set data link type (%s).",
1496 set_linktype_err_str);
1501 /* We couldn't open "cfile.iface" as a network device. */
1503 /* On Windows, we don't support capturing on pipes, so we give up. */
1505 /* On Win32 OSes, the capture devices are probably available to all
1506 users; don't warn about permissions problems.
1508 Do, however, warn that WAN devices aren't supported. */
1509 g_snprintf(errmsg, sizeof errmsg,
1510 "The capture session could not be initiated (%s).\n"
1511 "Please check that you have the proper interface specified.\n"
1513 "Note that the WinPcap 2.x version of the driver Ethereal uses for packet\n"
1514 "capture on Windows doesn't support capturing on PPP/WAN interfaces in\n"
1515 "Windows NT/2000/XP/2003 Server, and that the WinPcap 3.0 and later versions\n"
1516 "don't support capturing on PPP/WAN interfaces at all.\n",
1520 /* try to open cfile.iface as a pipe */
1521 pipe_fd = pipe_open_live(capture_opts.iface, &hdr, &ld, errmsg,
1524 if (pipe_fd == -1) {
1526 if (ld.pipe_err == PIPNEXIST) {
1527 /* Pipe doesn't exist, so output message for interface */
1529 /* If we got a "can't find PPA for XXX" message, warn the user (who
1530 is running Tethereal on HP-UX) that they don't have a version
1531 of libpcap that properly handles HP-UX (libpcap 0.6.x and later
1532 versions, which properly handle HP-UX, say "can't find /dev/dlpi
1533 PPA for XXX" rather than "can't find PPA for XXX"). */
1534 if (strncmp(open_err_str, ppamsg, sizeof ppamsg - 1) == 0)
1537 "You are running Tethereal with a version of the libpcap library\n"
1538 "that doesn't handle HP-UX network devices well; this means that\n"
1539 "Tethereal may not be able to capture packets.\n"
1541 "To fix this, you should install libpcap 0.6.2, or a later version\n"
1542 "of libpcap, rather than libpcap 0.4 or 0.5.x. It is available in\n"
1543 "packaged binary form from the Software Porting And Archive Centre\n"
1544 "for HP-UX; the Centre is at http://hpux.connect.org.uk/ - the page\n"
1545 "at the URL lists a number of mirror sites.";
1548 g_snprintf(errmsg, sizeof errmsg,
1549 "The capture session could not be initiated (%s).\n"
1550 "Please check to make sure you have sufficient permissions, and that\n"
1551 "you have the proper interface or pipe specified.%s", open_err_str,
1555 * Else pipe (or file) does exist and pipe_open_live() has
1560 /* pipe_open_live() succeeded; don't want
1561 error message from pcap_open_live() */
1562 open_err_str[0] = '\0';
1568 * We've opened the capture device, so, if we're set-UID or set-GID,
1569 * relinquish those privileges.
1571 * XXX - if we have saved set-user-ID support, we should give up those
1572 * privileges immediately, and then reclaim them long enough to get
1573 * a list of network interfaces and to open one, and then give them
1574 * up again, so that stuff we do while processing the argument list,
1575 * reading the user's preferences, etc. is done as the real user and
1576 * group, not the effective user and group.
1582 if (capture_opts.cfilter && !ld.from_pipe) {
1583 /* A capture filter was specified; set it up. */
1584 if (pcap_lookupnet(capture_opts.iface, &netnum, &netmask, lookup_net_err_str) < 0) {
1586 * Well, we can't get the netmask for this interface; it's used
1587 * only for filters that check for broadcast IP addresses, so
1588 * we just warn the user, and punt and use 0.
1591 "Warning: Couldn't obtain netmask info (%s).\n", lookup_net_err_str);
1594 if (pcap_compile(ld.pch, &fcode, capture_opts.cfilter, 1, netmask) < 0) {
1595 if (dfilter_compile(capture_opts.cfilter, &rfcode)) {
1596 g_snprintf(errmsg, sizeof errmsg,
1597 "Unable to parse capture filter string (%s).\n"
1598 " Interestingly enough, this looks like a valid display filter\n"
1599 " Are you sure you didn't mix them up?",
1600 pcap_geterr(ld.pch));
1602 g_snprintf(errmsg, sizeof errmsg,
1603 "Unable to parse capture filter string (%s).",
1604 pcap_geterr(ld.pch));
1608 if (pcap_setfilter(ld.pch, &fcode) < 0) {
1609 g_snprintf(errmsg, sizeof errmsg, "Can't install filter (%s).",
1610 pcap_geterr(ld.pch));
1611 #ifdef HAVE_PCAP_FREECODE
1612 pcap_freecode(&fcode);
1616 #ifdef HAVE_PCAP_FREECODE
1617 pcap_freecode(&fcode);
1621 /* Set up to write to the capture file. */
1624 pcap_encap = hdr.network;
1625 file_snaplen = hdr.snaplen;
1629 pcap_encap = get_pcap_linktype(ld.pch, capture_opts.iface);
1630 file_snaplen = pcap_snapshot(ld.pch);
1632 ld.linktype = wtap_pcap_encap_to_wtap_encap(pcap_encap);
1633 if (save_file != NULL) {
1634 /* Set up to write to the capture file. */
1635 if (ld.linktype == WTAP_ENCAP_UNKNOWN) {
1636 strcpy(errmsg, "The network you're capturing from is of a type"
1637 " that Tethereal doesn't support.");
1640 ld.save_file = save_file;
1641 if (capture_opts.multi_files_on) {
1642 save_file_fd = ringbuf_init(save_file,
1643 capture_opts.ring_num_files);
1644 if (save_file_fd != -1) {
1645 ld.pdh = ringbuf_init_wtap_dump_fdopen(out_file_type, ld.linktype,
1646 file_snaplen, &err);
1648 err = errno; /* "ringbuf_init()" failed */
1652 ld.pdh = wtap_dump_open(save_file, out_file_type,
1653 ld.linktype, file_snaplen, &err);
1656 if (ld.pdh == NULL) {
1657 g_snprintf(errmsg, sizeof errmsg,
1658 cf_open_error_message(err, NULL, TRUE, out_file_type),
1659 *save_file == '\0' ? "stdout" : save_file);
1664 /* Does "open_err_str" contain a non-empty string? If so, "pcap_open_live()"
1665 returned a warning; print it, but keep capturing. */
1666 if (open_err_str[0] != '\0')
1667 fprintf(stderr, "tethereal: WARNING: %s.\n", open_err_str);
1670 /* Catch a CTRL+C event and, if we get it, clean up and exit. */
1671 SetConsoleCtrlHandler(capture_cleanup, TRUE);
1673 /* Catch SIGINT and SIGTERM and, if we get either of them, clean up
1675 XXX - deal with signal semantics on various UNIX platforms. Or just
1676 use "sigaction()" and be done with it? */
1677 signal(SIGTERM, capture_cleanup);
1678 signal(SIGINT, capture_cleanup);
1679 if ((oldhandler = signal(SIGHUP, capture_cleanup)) != SIG_DFL)
1680 signal(SIGHUP, oldhandler);
1683 /* Catch SIGINFO and, if we get it and we're capturing to a file in
1684 quiet mode, report the number of packets we've captured. */
1685 signal(SIGINFO, report_counts_siginfo);
1686 #endif /* SIGINFO */
1689 /* Let the user know what interface was chosen. */
1690 descr = get_interface_descriptive_name(capture_opts.iface);
1691 fprintf(stderr, "Capturing on %s\n", descr);
1694 /* initialize capture stop conditions */
1695 init_capture_stop_conditions();
1696 /* create stop conditions */
1697 if (capture_opts.has_autostop_filesize)
1698 cnd_stop_capturesize = cnd_new((const char*)CND_CLASS_CAPTURESIZE,
1699 (long)capture_opts.autostop_filesize * 1000);
1700 if (capture_opts.has_autostop_duration)
1701 cnd_stop_timeout = cnd_new((const char*)CND_CLASS_TIMEOUT,
1702 (gint32)capture_opts.autostop_duration);
1704 if (capture_opts.multi_files_on && capture_opts.has_file_duration)
1705 cnd_ring_timeout = cnd_new(CND_CLASS_TIMEOUT,
1706 capture_opts.file_duration);
1708 if (!setjmp(ld.stopenv)) {
1710 ld.packet_count = 0;
1714 /* We need to be careful with automatic variables defined in the
1715 outer scope which are changed inside the loop. Most compilers
1716 don't try to roll them back to their original values after the
1717 longjmp which causes the loop to finish, but all that the
1718 standards say is that their values are indeterminate. If we
1719 don't want them to be rolled back, we should define them with the
1720 volatile attribute (paraphrasing W. Richard Stevens, Advanced
1721 Programming in the UNIX Environment, p. 178).
1723 The "err" variable causes a particular problem. If we give it
1724 the volatile attribute, then when we pass a reference to it (as
1725 in "&err") to a function, GCC warns: "passing arg <n> of
1726 <function> discards qualifiers from pointer target type".
1727 Therefore within the loop and just beyond we don't use "err".
1728 Within the loop we define "loop_err", and assign its value to
1729 "volatile_err", which is in the outer scope and is checked when
1732 We also define "packet_count_prev" here to keep things tidy,
1733 since it's used only inside the loop. If it were defined in the
1734 outer scope, GCC would give a warning (unnecessary in this case)
1735 that it might be clobbered, and we'd need to give it the volatile
1736 attribute to suppress the warning. */
1739 int packet_count_prev = 0;
1741 if (cnd_stop_capturesize == NULL && cnd_stop_timeout == NULL) {
1742 /* We're not stopping at a particular capture file size, and we're
1743 not stopping after some particular amount of time has expired,
1744 so either we have no stop condition or the only stop condition
1745 is a maximum packet count.
1747 If there's no maximum packet count, pass it -1, meaning "until
1748 you run out of packets in the bufferful you read". Otherwise,
1749 pass it the number of packets we have left to capture.
1751 We don't call "pcap_loop()" as, if we're saving to a file that's
1752 a FIFO, we want to flush the FIFO after we're done processing
1753 this libpcap bufferful of packets, so that the program
1754 reading the FIFO sees the packets immediately and doesn't get
1755 any partial packet, forcing it to block in the middle of reading
1757 if (capture_opts.autostop_packets == 0)
1760 if (ld.packet_count >= capture_opts.autostop_packets) {
1761 /* XXX do we need this test here? */
1762 /* It appears there's nothing more to capture. */
1765 pcap_cnt = capture_opts.autostop_packets - ld.packet_count;
1768 /* We need to check the capture file size or the timeout after
1774 inpkts = pipe_dispatch(pipe_fd, &ld, &hdr, &rechdr, pcap_data,
1775 errmsg, sizeof errmsg);
1778 inpkts = pcap_dispatch(ld.pch, pcap_cnt, capture_pcap_cb, (guchar *) &ld);
1780 /* Error from "pcap_dispatch()", or error or "no more packets" from
1781 "pipe_dispatch(). */
1783 } else if (cnd_stop_timeout != NULL && cnd_eval(cnd_stop_timeout)) {
1784 /* The specified capture time has elapsed; stop the capture. */
1786 } else if (inpkts > 0) {
1787 if (capture_opts.autostop_packets != 0 &&
1788 ld.packet_count >= capture_opts.autostop_packets) {
1789 /* The specified number of packets have been captured and have
1790 passed both any capture filter in effect and any read filter
1793 } else if (cnd_stop_capturesize != NULL &&
1794 cnd_eval(cnd_stop_capturesize,
1795 (guint32)wtap_get_bytes_dumped(ld.pdh))) {
1796 /* We're saving the capture to a file, and the capture file reached
1797 its maximum size. */
1798 if (capture_opts.multi_files_on) {
1799 /* Switch to the next ringbuffer file */
1800 if (ringbuf_switch_file(&ld.pdh, &save_file, &save_file_fd, &loop_err)) {
1801 /* File switch succeeded: reset the condition */
1802 cnd_reset(cnd_stop_capturesize);
1803 if (cnd_ring_timeout) {
1804 cnd_reset(cnd_ring_timeout);
1807 /* File switch failed: stop here */
1808 volatile_err = loop_err;
1812 /* No ringbuffer - just stop. */
1816 if (ld.output_to_pipe) {
1817 if (ld.packet_count > packet_count_prev) {
1818 if (fflush(wtap_dump_file(ld.pdh))) {
1819 volatile_err = errno;
1822 packet_count_prev = ld.packet_count;
1826 } /* while (ld.go) */
1828 /* delete stop conditions */
1829 if (cnd_stop_capturesize != NULL)
1830 cnd_delete(cnd_stop_capturesize);
1831 if (cnd_stop_timeout != NULL)
1832 cnd_delete(cnd_stop_timeout);
1833 if (cnd_ring_timeout != NULL)
1834 cnd_delete(cnd_ring_timeout);
1836 if (print_packet_counts) {
1837 /* We're printing packet counts to stderr.
1838 Send a newline so that we move to the line after the packet count. */
1839 fprintf(stderr, "\n");
1842 /* If we got an error while capturing, report it. */
1846 if (ld.pipe_err == PIPERR) {
1847 fprintf(stderr, "tethereal: Error while capturing packets: %s\n",
1853 fprintf(stderr, "tethereal: Error while capturing packets: %s\n",
1854 pcap_geterr(ld.pch));
1858 if (volatile_err == 0)
1861 show_capture_file_io_error(save_file, volatile_err, FALSE);
1865 if (save_file != NULL) {
1866 /* We're saving to a file or files; close all files. */
1867 if (capture_opts.multi_files_on) {
1868 dump_ok = ringbuf_wtap_dump_close(&save_file, &err);
1870 dump_ok = wtap_dump_close(ld.pdh, &err);
1872 /* If we've displayed a message about a write error, there's no point
1873 in displaying another message about an error on close. */
1874 if (!dump_ok && !write_err)
1875 show_capture_file_io_error(save_file, err, TRUE);
1879 if (ld.from_pipe && pipe_fd >= 0)
1884 /* Get the capture statistics, and, if any packets were dropped, report
1886 if (pcap_stats(ld.pch, &stats) >= 0) {
1887 if (stats.ps_drop != 0) {
1888 fprintf(stderr, "%u packets dropped\n", stats.ps_drop);
1891 fprintf(stderr, "tethereal: Can't get packet-drop statistics: %s\n",
1892 pcap_geterr(ld.pch));
1897 /* Report the number of captured packets if not reported during capture
1898 and we are saving to a file. */
1904 if (capture_opts.multi_files_on) {
1905 ringbuf_error_cleanup();
1909 fprintf(stderr, "tethereal: %s\n", errmsg);
1925 capture_pcap_cb(guchar *user, const struct pcap_pkthdr *phdr,
1928 struct wtap_pkthdr whdr;
1929 union wtap_pseudo_header pseudo_header;
1930 loop_data *ldat = (loop_data *) user;
1935 /* Convert from libpcap to Wiretap format.
1936 If that fails, ignore the packet (wtap_process_pcap_packet has
1937 written an error message). */
1938 pd = wtap_process_pcap_packet(ldat->linktype, phdr, pd, &pseudo_header,
1945 * Prevent a SIGINFO handler from writing to stdout while we're
1946 * doing so; instead, have it just set a flag telling us to print
1947 * that information when we're done.
1950 #endif /* SIGINFO */
1952 /* The current packet may have arrived after a very long silence,
1953 * way past the time to switch files. In order not to have
1954 * the first packet of a new series of events as the last
1955 * [or only] packet in the file, switch before writing!
1957 if (cnd_ring_timeout != NULL && cnd_eval(cnd_ring_timeout)) {
1958 /* time elapsed for this ring file, switch to the next */
1959 if (ringbuf_switch_file(&ldat->pdh, &ldat->save_file, &save_file_fd, &loop_err)) {
1960 /* File switch succeeded: reset the condition */
1961 cnd_reset(cnd_ring_timeout);
1963 /* File switch failed: stop here */
1964 /* XXX - we should do something with "loop_err" */
1969 if (!process_packet(&cfile, ldat->pdh, 0, &whdr, &pseudo_header, pd, &err)) {
1970 /* Error writing to a capture file */
1971 if (print_packet_counts) {
1972 /* We're printing counts of packets captured; move to the line after
1974 fprintf(stderr, "\n");
1976 show_capture_file_io_error(ldat->save_file, err, FALSE);
1977 pcap_close(ldat->pch);
1978 wtap_dump_close(ldat->pdh, &err);
1984 * Allow SIGINFO handlers to write.
1989 * If a SIGINFO handler asked us to write out capture counts, do so.
1993 #endif /* SIGINFO */
1998 capture_cleanup(DWORD ctrltype _U_)
2000 /* CTRL_C_EVENT is sort of like SIGINT, CTRL_BREAK_EVENT is unique to
2001 Windows, CTRL_CLOSE_EVENT is sort of like SIGHUP, CTRL_LOGOFF_EVENT
2002 is also sort of like SIGHUP, and CTRL_SHUTDOWN_EVENT is sort of
2003 like SIGTERM at least when the machine's shutting down.
2005 For now, we handle them all as indications that we should clean up
2006 and quit, just as we handle SIGINT, SIGHUP, and SIGTERM in that
2009 However, as handlers run in a new thread, we can't just longjmp
2010 out; we have to set "ld.go" to FALSE, and must return TRUE so that
2011 no other handler - such as one that would terminate the process -
2014 XXX - for some reason, typing ^C to Tethereal, if you run this in
2015 a Cygwin console window in at least some versions of Cygwin,
2016 causes Tethereal to terminate immediately; this routine gets
2017 called, but the main loop doesn't get a chance to run and
2018 exit cleanly, at least if this is compiled with Microsoft Visual
2019 C++ (i.e., it's a property of the Cygwin console window or Bash;
2020 it happens if Tethereal is not built with Cygwin - for all I know,
2021 building it with Cygwin may make the problem go away). */
2027 capture_cleanup(int signum _U_)
2029 /* Longjmp back to the starting point; "pcap_dispatch()", on many
2030 UNIX platforms, just keeps looping if it gets EINTR, so if we set
2031 "ld.go" to FALSE and return, we won't break out of it and quit
2033 longjmp(ld.stopenv, 1);
2041 /* XXX - if we use sigaction, this doesn't have to be done.
2042 (Yes, this isn't necessary on BSD, but just in case a system
2043 where "signal()" has AT&T semantics adopts SIGINFO....) */
2044 signal(SIGINFO, report_counts_siginfo);
2045 #endif /* SIGINFO */
2047 if (!print_packet_counts) {
2048 /* Report the count only if we aren't printing a packet count
2049 as packets arrive. */
2050 fprintf(stderr, "%u packets captured\n", ld.packet_count);
2053 infoprint = FALSE; /* we just reported it */
2054 #endif /* SIGINFO */
2059 report_counts_siginfo(int signum _U_)
2061 int sav_errno = errno;
2062 /* If we've been told to delay printing, just set a flag asking
2063 that we print counts (if we're supposed to), otherwise print
2064 the count of packets captured (if we're supposed to). */
2071 #endif /* SIGINFO */
2072 #endif /* HAVE_LIBPCAP */
2075 load_cap_file(capture_file *cf, char *save_file, int out_file_type)
2078 int snapshot_length;
2084 linktype = wtap_file_encap(cf->wth);
2085 if (save_file != NULL) {
2086 /* Set up to write to the capture file. */
2087 snapshot_length = wtap_snapshot_length(cf->wth);
2088 if (snapshot_length == 0) {
2089 /* Snapshot length of input file not known. */
2090 snapshot_length = WTAP_MAX_PACKET_SIZE;
2092 pdh = wtap_dump_open(save_file, out_file_type,
2093 linktype, snapshot_length, &err);
2096 /* We couldn't set up to write to the capture file. */
2099 case WTAP_ERR_UNSUPPORTED_FILE_TYPE:
2101 "tethereal: Capture files can't be written in that format.\n");
2104 case WTAP_ERR_UNSUPPORTED_ENCAP:
2105 case WTAP_ERR_ENCAP_PER_PACKET_UNSUPPORTED:
2107 "tethereal: The capture file being read can't be written in "
2111 case WTAP_ERR_CANT_OPEN:
2113 "tethereal: The file \"%s\" couldn't be created for some "
2114 "unknown reason.\n",
2115 *save_file == '\0' ? "stdout" : save_file);
2118 case WTAP_ERR_SHORT_WRITE:
2120 "tethereal: A full header couldn't be written to the file \"%s\".\n",
2121 *save_file == '\0' ? "stdout" : save_file);
2126 "tethereal: The file \"%s\" could not be created: %s\n.",
2127 *save_file == '\0' ? "stdout" : save_file,
2128 wtap_strerror(err));
2134 if (print_packet_info) {
2135 if (!write_preamble(cf)) {
2137 show_print_file_io_error(err);
2143 while (wtap_read(cf->wth, &err, &err_info, &data_offset)) {
2144 if (!process_packet(cf, pdh, data_offset, wtap_phdr(cf->wth),
2145 wtap_pseudoheader(cf->wth), wtap_buf_ptr(cf->wth),
2147 /* Error writing to a capture file */
2148 show_capture_file_io_error(save_file, err, FALSE);
2149 wtap_dump_close(pdh, &err);
2154 /* Print a message noting that the read failed somewhere along the line. */
2157 case WTAP_ERR_UNSUPPORTED_ENCAP:
2159 "tethereal: \"%s\" has a packet with a network type that Tethereal doesn't support.\n(%s)\n",
2160 cf->filename, err_info);
2163 case WTAP_ERR_CANT_READ:
2165 "tethereal: An attempt to read from \"%s\" failed for some unknown reason.\n",
2169 case WTAP_ERR_SHORT_READ:
2171 "tethereal: \"%s\" appears to have been cut short in the middle of a packet.\n",
2175 case WTAP_ERR_BAD_RECORD:
2177 "tethereal: \"%s\" appears to be damaged or corrupt.\n(%s)\n",
2178 cf->filename, err_info);
2183 "tethereal: An error occurred while reading \"%s\": %s.\n",
2184 cf->filename, wtap_strerror(err));
2187 if (save_file != NULL) {
2188 /* Now close the capture file. */
2189 if (!wtap_dump_close(pdh, &err))
2190 show_capture_file_io_error(save_file, err, TRUE);
2193 if (save_file != NULL) {
2194 /* Now close the capture file. */
2195 if (!wtap_dump_close(pdh, &err))
2196 show_capture_file_io_error(save_file, err, TRUE);
2198 if (print_packet_info) {
2199 if (!write_finale()) {
2201 show_print_file_io_error(err);
2208 wtap_close(cf->wth);
2215 fill_in_fdata(frame_data *fdata, capture_file *cf,
2216 const struct wtap_pkthdr *phdr, long offset)
2221 fdata->num = cf->count;
2222 fdata->pkt_len = phdr->len;
2223 cum_bytes += phdr->len;
2224 fdata->cum_bytes = cum_bytes;
2225 fdata->cap_len = phdr->caplen;
2226 fdata->file_off = offset;
2227 fdata->lnk_t = phdr->pkt_encap;
2228 fdata->abs_secs = phdr->ts.tv_sec;
2229 fdata->abs_usecs = phdr->ts.tv_usec;
2230 fdata->flags.passed_dfilter = 0;
2231 fdata->flags.encoding = CHAR_ASCII;
2232 fdata->flags.visited = 0;
2233 fdata->flags.marked = 0;
2234 fdata->flags.ref_time = 0;
2236 /* If we don't have the time stamp of the first packet in the
2237 capture, it's because this is the first packet. Save the time
2238 stamp of this packet as the time stamp of the first packet. */
2239 if (!firstsec && !firstusec) {
2240 firstsec = fdata->abs_secs;
2241 firstusec = fdata->abs_usecs;
2244 /* If we don't have the time stamp of the previous displayed packet,
2245 it's because this is the first displayed packet. Save the time
2246 stamp of this packet as the time stamp of the previous displayed
2248 if (!prevsec && !prevusec) {
2249 prevsec = fdata->abs_secs;
2250 prevusec = fdata->abs_usecs;
2253 /* Get the time elapsed between the first packet and this packet. */
2254 compute_timestamp_diff(&fdata->rel_secs, &fdata->rel_usecs,
2255 fdata->abs_secs, fdata->abs_usecs, firstsec, firstusec);
2257 /* If it's greater than the current elapsed time, set the elapsed time
2258 to it (we check for "greater than" so as not to be confused by
2259 time moving backwards). */
2260 if ((gint32)cf->esec < fdata->rel_secs
2261 || ((gint32)cf->esec == fdata->rel_secs && (gint32)cf->eusec < fdata->rel_usecs)) {
2262 cf->esec = fdata->rel_secs;
2263 cf->eusec = fdata->rel_usecs;
2266 /* Get the time elapsed between the previous displayed packet and
2268 compute_timestamp_diff(&fdata->del_secs, &fdata->del_usecs,
2269 fdata->abs_secs, fdata->abs_usecs, prevsec, prevusec);
2270 prevsec = fdata->abs_secs;
2271 prevusec = fdata->abs_usecs;
2274 /* Free up all data attached to a "frame_data" structure. */
2276 clear_fdata(frame_data *fdata)
2279 g_slist_free(fdata->pfd);
2283 process_packet(capture_file *cf, wtap_dumper *pdh, long offset,
2284 const struct wtap_pkthdr *whdr,
2285 union wtap_pseudo_header *pseudo_header, const guchar *pd,
2289 gboolean create_proto_tree;
2290 epan_dissect_t *edt;
2293 /* Count this packet. */
2296 /* If we're going to print packet information, or we're going to
2297 run a read filter, or we're going to process taps, set up to
2298 do a dissection and do so. */
2299 if (do_dissection) {
2300 fill_in_fdata(&fdata, cf, whdr, offset);
2302 if (print_packet_info) {
2303 /* Grab any resolved addresses */
2305 if (g_resolv_flags) {
2306 host_name_lookup_process(NULL);
2311 if (cf->rfcode || verbose || num_tap_filters!=0)
2312 create_proto_tree = TRUE;
2314 create_proto_tree = FALSE;
2315 /* The protocol tree will be "visible", i.e., printed, only if we're
2316 printing packet details, which is true if we're printing stuff
2317 ("print_packet_info" is true) and we're in verbose mode ("verbose"
2319 edt = epan_dissect_new(create_proto_tree, print_packet_info && verbose);
2321 /* If we're running a read filter, prime the epan_dissect_t with that
2324 epan_dissect_prime_dfilter(edt, cf->rfcode);
2326 tap_queue_init(edt);
2328 /* We only need the columns if we're printing packet info but we're
2329 *not* verbose; in verbose mode, we print the protocol tree, not
2330 the protocol summary. */
2331 epan_dissect_run(edt, pseudo_header, pd, &fdata,
2332 (print_packet_info && !verbose) ? &cf->cinfo : NULL);
2334 tap_push_tapped_queue(edt);
2336 /* Run the read filter if we have one. */
2338 passed = dfilter_apply_edt(cf->rfcode, edt);
2342 /* We're not running a display filter and we're not printing any
2343 packet information, so we don't need to do a dissection, and all
2344 packets are processed. */
2350 /* Count this packet. */
2355 /* Process this packet. */
2357 /* We're writing to a capture file; write this packet. */
2358 if (!wtap_dump(pdh, whdr, pseudo_header, pd, err))
2361 if (print_packet_counts) {
2362 /* We're printing packet counts. */
2363 if (ld.packet_count != 0) {
2364 fprintf(stderr, "\r%u ", ld.packet_count);
2365 /* stderr could be line buffered */
2371 if (print_packet_info) {
2372 /* We're printing packet information; print the information for
2374 print_packet(cf, edt);
2376 /* The ANSI C standard does not appear to *require* that a line-buffered
2377 stream be flushed to the host environment whenever a newline is
2378 written, it just says that, on such a stream, characters "are
2379 intended to be transmitted to or from the host environment as a
2380 block when a new-line character is encountered".
2382 The Visual C++ 6.0 C implementation doesn't do what is intended;
2383 even if you set a stream to be line-buffered, it still doesn't
2384 flush the buffer at the end of every line.
2386 So, if the "-l" flag was specified, we flush the standard output
2387 at the end of a packet. This will do the right thing if we're
2388 printing packet summary lines, and, as we print the entire protocol
2389 tree for a single packet without waiting for anything to happen,
2390 it should be as good as line-buffered mode if we're printing
2391 protocol trees. (The whole reason for the "-l" flag in either
2392 tcpdump or Tethereal is to allow the output of a live capture to
2393 be piped to a program or script and to have that script see the
2394 information for the packet as soon as it's printed, rather than
2395 having to wait until a standard I/O buffer fills up. */
2399 if (ferror(stdout)) {
2400 show_print_file_io_error(errno);
2406 if (do_dissection) {
2407 epan_dissect_free(edt);
2408 clear_fdata(&fdata);
2414 show_capture_file_io_error(const char *fname, int err, gboolean is_close)
2423 "tethereal: Not all the packets could be written to \"%s\" because there is "
2424 "no space left on the file system.\n",
2431 "tethereal: Not all the packets could be written to \"%s\" because you are "
2432 "too close to, or over your disk quota.\n",
2437 case WTAP_ERR_CANT_CLOSE:
2439 "tethereal: \"%s\" couldn't be closed for some unknown reason.\n",
2443 case WTAP_ERR_SHORT_WRITE:
2445 "tethereal: Not all the packets could be written to \"%s\".\n",
2452 "tethereal: \"%s\" could not be closed: %s.\n",
2453 fname, wtap_strerror(err));
2456 "tethereal: An error occurred while writing to \"%s\": %s.\n",
2457 fname, wtap_strerror(err));
2464 write_preamble(capture_file *cf)
2466 switch (output_action) {
2469 return print_preamble(print_stream, cf->filename);
2474 write_pdml_preamble(stdout);
2476 write_psml_preamble(stdout);
2477 return !ferror(stdout);
2480 g_assert_not_reached();
2486 get_line_buf(size_t len)
2488 static char *line_bufp = NULL;
2489 static size_t line_buf_len = 256;
2490 size_t new_line_buf_len;
2492 for (new_line_buf_len = line_buf_len; len > new_line_buf_len;
2493 new_line_buf_len *= 2)
2495 if (line_bufp == NULL) {
2496 line_buf_len = new_line_buf_len;
2497 line_bufp = g_malloc(line_buf_len + 1);
2499 if (new_line_buf_len > line_buf_len) {
2500 line_buf_len = new_line_buf_len;
2501 line_bufp = g_realloc(line_bufp, line_buf_len + 1);
2508 print_columns(capture_file *cf)
2515 line_bufp = get_line_buf(256);
2518 for (i = 0; i < cf->cinfo.num_cols; i++) {
2519 switch (cf->cinfo.col_fmt[i]) {
2523 * Don't print this if we're doing a live capture from a network
2524 * interface - if we're doing a live capture, you won't be
2525 * able to look at the capture in the future (it's not being
2526 * saved anywhere), so the frame numbers are unlikely to be
2529 * (XXX - it might be nice to be able to save and print at
2530 * the same time, sort of like an "Update list of packets
2531 * in real time" capture in Ethereal.)
2533 if (capture_opts.iface != NULL)
2536 column_len = strlen(cf->cinfo.col_data[i]);
2539 line_bufp = get_line_buf(buf_offset + column_len);
2540 sprintf(line_bufp + buf_offset, "%3s", cf->cinfo.col_data[i]);
2546 case COL_ABS_DATE_TIME: /* XXX - wider */
2547 column_len = strlen(cf->cinfo.col_data[i]);
2548 if (column_len < 10)
2550 line_bufp = get_line_buf(buf_offset + column_len);
2551 sprintf(line_bufp + buf_offset, "%10s", cf->cinfo.col_data[i]);
2557 case COL_DEF_DL_SRC:
2558 case COL_RES_DL_SRC:
2559 case COL_UNRES_DL_SRC:
2560 case COL_DEF_NET_SRC:
2561 case COL_RES_NET_SRC:
2562 case COL_UNRES_NET_SRC:
2563 column_len = strlen(cf->cinfo.col_data[i]);
2564 if (column_len < 12)
2566 line_bufp = get_line_buf(buf_offset + column_len);
2567 sprintf(line_bufp + buf_offset, "%12s", cf->cinfo.col_data[i]);
2573 case COL_DEF_DL_DST:
2574 case COL_RES_DL_DST:
2575 case COL_UNRES_DL_DST:
2576 case COL_DEF_NET_DST:
2577 case COL_RES_NET_DST:
2578 case COL_UNRES_NET_DST:
2579 column_len = strlen(cf->cinfo.col_data[i]);
2580 if (column_len < 12)
2582 line_bufp = get_line_buf(buf_offset + column_len);
2583 sprintf(line_bufp + buf_offset, "%-12s", cf->cinfo.col_data[i]);
2587 column_len = strlen(cf->cinfo.col_data[i]);
2588 line_bufp = get_line_buf(buf_offset + column_len);
2589 strcat(line_bufp + buf_offset, cf->cinfo.col_data[i]);
2592 buf_offset += column_len;
2593 if (i != cf->cinfo.num_cols - 1) {
2595 * This isn't the last column, so we need to print a
2596 * separator between this column and the next.
2598 * If we printed a network source and are printing a
2599 * network destination of the same type next, separate
2600 * them with "->"; if we printed a network destination
2601 * and are printing a network source of the same type
2602 * next, separate them with "<-"; otherwise separate them
2605 * We add enough space to the buffer for " <- " or " -> ",
2606 * even if we're only adding " ".
2608 line_bufp = get_line_buf(buf_offset + 4);
2609 switch (cf->cinfo.col_fmt[i]) {
2614 switch (cf->cinfo.col_fmt[i + 1]) {
2619 strcat(line_bufp + buf_offset, " -> ");
2624 strcat(line_bufp + buf_offset, " ");
2630 case COL_DEF_DL_SRC:
2631 case COL_RES_DL_SRC:
2632 case COL_UNRES_DL_SRC:
2633 switch (cf->cinfo.col_fmt[i + 1]) {
2635 case COL_DEF_DL_DST:
2636 case COL_RES_DL_DST:
2637 case COL_UNRES_DL_DST:
2638 strcat(line_bufp + buf_offset, " -> ");
2643 strcat(line_bufp + buf_offset, " ");
2649 case COL_DEF_NET_SRC:
2650 case COL_RES_NET_SRC:
2651 case COL_UNRES_NET_SRC:
2652 switch (cf->cinfo.col_fmt[i + 1]) {
2654 case COL_DEF_NET_DST:
2655 case COL_RES_NET_DST:
2656 case COL_UNRES_NET_DST:
2657 strcat(line_bufp + buf_offset, " -> ");
2662 strcat(line_bufp + buf_offset, " ");
2671 switch (cf->cinfo.col_fmt[i + 1]) {
2676 strcat(line_bufp + buf_offset, " <- ");
2681 strcat(line_bufp + buf_offset, " ");
2687 case COL_DEF_DL_DST:
2688 case COL_RES_DL_DST:
2689 case COL_UNRES_DL_DST:
2690 switch (cf->cinfo.col_fmt[i + 1]) {
2692 case COL_DEF_DL_SRC:
2693 case COL_RES_DL_SRC:
2694 case COL_UNRES_DL_SRC:
2695 strcat(line_bufp + buf_offset, " <- ");
2700 strcat(line_bufp + buf_offset, " ");
2706 case COL_DEF_NET_DST:
2707 case COL_RES_NET_DST:
2708 case COL_UNRES_NET_DST:
2709 switch (cf->cinfo.col_fmt[i + 1]) {
2711 case COL_DEF_NET_SRC:
2712 case COL_RES_NET_SRC:
2713 case COL_UNRES_NET_SRC:
2714 strcat(line_bufp + buf_offset, " <- ");
2719 strcat(line_bufp + buf_offset, " ");
2726 strcat(line_bufp + buf_offset, " ");
2732 return print_line(print_stream, 0, line_bufp);
2736 print_packet(capture_file *cf, epan_dissect_t *edt)
2738 print_args_t print_args;
2741 /* Print the information in the protocol tree. */
2742 switch (output_action) {
2745 print_args.to_file = TRUE;
2746 print_args.format = print_format;
2747 print_args.print_summary = !verbose;
2748 print_args.print_hex = verbose && print_hex;
2749 print_args.print_formfeed = FALSE;
2750 print_args.print_dissections = verbose ? print_dissections_expanded : print_dissections_none;
2752 /* init the packet range */
2753 packet_range_init(&print_args.range);
2755 if (!proto_tree_print(&print_args, edt, print_stream))
2758 /* "print_hex_data()" will put out a leading blank line, as well
2759 as a trailing one; print one here, to separate the packets,
2760 only if "print_hex_data()" won't be called. */
2761 if (!print_line(print_stream, 0, ""))
2767 proto_tree_write_pdml(edt, stdout);
2769 return !ferror(stdout);
2772 /* Just fill in the columns. */
2773 epan_dissect_fill_in_columns(edt);
2775 /* Now print them. */
2776 switch (output_action) {
2779 if (!print_columns(cf))
2784 proto_tree_write_psml(edt, stdout);
2785 return !ferror(stdout);
2789 if (!print_hex_data(print_stream, edt))
2791 if (!print_line(print_stream, 0, ""))
2800 switch (output_action) {
2803 return print_finale(print_stream);
2808 write_pdml_finale(stdout);
2810 write_psml_finale(stdout);
2811 return !ferror(stdout);
2814 g_assert_not_reached();
2820 show_print_file_io_error(int err)
2826 "tethereal: Not all the packets could be printed because there is "
2827 "no space left on the file system.\n");
2833 "tethereal: Not all the packets could be printed because you are "
2834 "too close to, or over your disk quota.\n");
2840 "tethereal: An error occurred while printing packets: %s.\n",
2847 cf_open_error_message(int err, gchar *err_info, gboolean for_writing,
2851 static char errmsg_errno[1024+1];
2854 /* Wiretap error. */
2857 case WTAP_ERR_NOT_REGULAR_FILE:
2858 errmsg = "The file \"%s\" is a \"special file\" or socket or other non-regular file.";
2861 case WTAP_ERR_FILE_UNKNOWN_FORMAT:
2862 /* Seen only when opening a capture file for reading. */
2863 errmsg = "The file \"%s\" isn't a capture file in a format Tethereal understands.";
2866 case WTAP_ERR_UNSUPPORTED:
2867 /* Seen only when opening a capture file for reading. */
2868 g_snprintf(errmsg_errno, sizeof(errmsg_errno),
2869 "The file \"%%s\" isn't a capture file in a format Tethereal understands.\n"
2872 errmsg = errmsg_errno;
2875 case WTAP_ERR_CANT_WRITE_TO_PIPE:
2876 /* Seen only when opening a capture file for writing. */
2877 g_snprintf(errmsg_errno, sizeof(errmsg_errno),
2878 "The file \"%%s\" is a pipe, and %s capture files can't be "
2879 "written to a pipe.", wtap_file_type_string(file_type));
2880 errmsg = errmsg_errno;
2883 case WTAP_ERR_UNSUPPORTED_FILE_TYPE:
2884 /* Seen only when opening a capture file for writing. */
2885 errmsg = "Tethereal doesn't support writing capture files in that format.";
2888 case WTAP_ERR_UNSUPPORTED_ENCAP:
2890 errmsg = "Tethereal can't save this capture in that format.";
2892 g_snprintf(errmsg_errno, sizeof(errmsg_errno),
2893 "The file \"%%s\" is a capture for a network type that Tethereal doesn't support.\n"
2896 errmsg = errmsg_errno;
2900 case WTAP_ERR_ENCAP_PER_PACKET_UNSUPPORTED:
2902 errmsg = "Tethereal can't save this capture in that format.";
2904 errmsg = "The file \"%s\" is a capture for a network type that Tethereal doesn't support.";
2907 case WTAP_ERR_BAD_RECORD:
2908 /* Seen only when opening a capture file for reading. */
2909 g_snprintf(errmsg_errno, sizeof(errmsg_errno),
2910 "The file \"%%s\" appears to be damaged or corrupt.\n"
2913 errmsg = errmsg_errno;
2916 case WTAP_ERR_CANT_OPEN:
2918 errmsg = "The file \"%s\" could not be created for some unknown reason.";
2920 errmsg = "The file \"%s\" could not be opened for some unknown reason.";
2923 case WTAP_ERR_SHORT_READ:
2924 errmsg = "The file \"%s\" appears to have been cut short"
2925 " in the middle of a packet or other data.";
2928 case WTAP_ERR_SHORT_WRITE:
2929 errmsg = "A full header couldn't be written to the file \"%s\".";
2933 g_snprintf(errmsg_errno, sizeof(errmsg_errno),
2934 "The file \"%%s\" could not be %s: %s.",
2935 for_writing ? "created" : "opened",
2936 wtap_strerror(err));
2937 errmsg = errmsg_errno;
2941 errmsg = file_open_error_message(err, for_writing);
2946 * Open/create errors are reported with an console message in Tethereal.
2949 open_failure_message(const char *filename, int err, gboolean for_writing)
2951 fprintf(stderr, "tethereal: ");
2952 fprintf(stderr, file_open_error_message(err, for_writing), filename);
2953 fprintf(stderr, "\n");
2957 cf_open(capture_file *cf, const char *fname, gboolean is_tempfile, int *err)
2961 char err_msg[2048+1];
2963 wth = wtap_open_offline(fname, err, &err_info, FALSE);
2967 /* The open succeeded. Fill in the information for this file. */
2969 /* Initialize all data structures used for dissection. */
2973 cf->f_datalen = 0; /* not used, but set it anyway */
2974 cf->f_len = 0; /* not used, but set it anyway */
2976 /* Set the file name because we need it to set the follow stream filter.
2977 XXX - is that still true? We need it for other reasons, though,
2979 cf->filename = g_strdup(fname);
2981 /* Indicate whether it's a permanent or temporary file. */
2982 cf->is_tempfile = is_tempfile;
2984 /* If it's a temporary capture buffer file, mark it as not saved. */
2985 cf->user_saved = !is_tempfile;
2987 cf->cd_t = wtap_file_type(cf->wth);
2989 cf->drops_known = FALSE;
2993 cf->snap = wtap_snapshot_length(cf->wth);
2994 if (cf->snap == 0) {
2995 /* Snapshot length not known. */
2996 cf->has_snap = FALSE;
2997 cf->snap = WTAP_MAX_PACKET_SIZE;
2999 cf->has_snap = TRUE;
3000 firstsec = 0, firstusec = 0;
3001 prevsec = 0, prevusec = 0;
3006 g_snprintf(err_msg, sizeof err_msg,
3007 cf_open_error_message(*err, err_info, FALSE, 0), fname);
3008 fprintf(stderr, "tethereal: %s\n", err_msg);
3014 /* Take care of byte order in the libpcap headers read from pipes.
3015 * (function taken from wiretap/libpcap.c) */
3017 adjust_header(loop_data *ldat, struct pcap_hdr *hdr, struct pcaprec_hdr *rechdr)
3019 if (ldat->byte_swapped) {
3020 /* Byte-swap the record header fields. */
3021 rechdr->ts_sec = BSWAP32(rechdr->ts_sec);
3022 rechdr->ts_usec = BSWAP32(rechdr->ts_usec);
3023 rechdr->incl_len = BSWAP32(rechdr->incl_len);
3024 rechdr->orig_len = BSWAP32(rechdr->orig_len);
3027 /* In file format version 2.3, the "incl_len" and "orig_len" fields were
3028 swapped, in order to match the BPF header layout.
3030 Unfortunately, some files were, according to a comment in the "libpcap"
3031 source, written with version 2.3 in their headers but without the
3032 interchanged fields, so if "incl_len" is greater than "orig_len" - which
3033 would make no sense - we assume that we need to swap them. */
3034 if (hdr->version_major == 2 &&
3035 (hdr->version_minor < 3 ||
3036 (hdr->version_minor == 3 && rechdr->incl_len > rechdr->orig_len))) {
3039 temp = rechdr->orig_len;
3040 rechdr->orig_len = rechdr->incl_len;
3041 rechdr->incl_len = temp;
3045 /* Mimic pcap_open_live() for pipe captures
3046 * We check if "pipename" is "-" (stdin) or a FIFO, open it, and read the
3048 * N.B. : we can't read the libpcap formats used in RedHat 6.1 or SuSE 6.3
3049 * because we can't seek on pipes (see wiretap/libpcap.c for details) */
3051 pipe_open_live(char *pipename, struct pcap_hdr *hdr, loop_data *ldat,
3052 char *errmsg, int errmsgl)
3054 struct stat pipe_stat;
3058 unsigned int bytes_read;
3061 * XXX Tethereal blocks until we return
3063 if (strcmp(pipename, "-") == 0)
3064 fd = 0; /* read from stdin */
3066 if (stat(pipename, &pipe_stat) < 0) {
3067 if (errno == ENOENT || errno == ENOTDIR)
3068 ldat->pipe_err = PIPNEXIST;
3070 g_snprintf(errmsg, errmsgl,
3071 "The capture session could not be initiated "
3072 "due to error on pipe: %s", strerror(errno));
3073 ldat->pipe_err = PIPERR;
3077 if (! S_ISFIFO(pipe_stat.st_mode)) {
3078 if (S_ISCHR(pipe_stat.st_mode)) {
3080 * Assume the user specified an interface on a system where
3081 * interfaces are in /dev. Pretend we haven't seen it.
3083 ldat->pipe_err = PIPNEXIST;
3085 g_snprintf(errmsg, errmsgl,
3086 "The capture session could not be initiated because\n"
3087 "\"%s\" is neither an interface nor a pipe", pipename);
3088 ldat->pipe_err = PIPERR;
3092 fd = open(pipename, O_RDONLY);
3094 g_snprintf(errmsg, errmsgl,
3095 "The capture session could not be initiated "
3096 "due to error on pipe open: %s", strerror(errno));
3097 ldat->pipe_err = PIPERR;
3102 ldat->from_pipe = TRUE;
3104 /* read the pcap header */
3106 while (bytes_read < sizeof magic) {
3107 b = read(fd, ((char *)&magic)+bytes_read, sizeof magic-bytes_read);
3110 g_snprintf(errmsg, errmsgl, "End of file on pipe during open");
3112 g_snprintf(errmsg, errmsgl, "Error on pipe during open: %s",
3121 /* Host that wrote it has our byte order, and was running
3122 a program using either standard or ss990417 libpcap. */
3123 ldat->byte_swapped = FALSE;
3124 ldat->modified = FALSE;
3126 case PCAP_MODIFIED_MAGIC:
3127 /* Host that wrote it has our byte order, but was running
3128 a program using either ss990915 or ss991029 libpcap. */
3129 ldat->byte_swapped = FALSE;
3130 ldat->modified = TRUE;
3132 case PCAP_SWAPPED_MAGIC:
3133 /* Host that wrote it has a byte order opposite to ours,
3134 and was running a program using either standard or
3135 ss990417 libpcap. */
3136 ldat->byte_swapped = TRUE;
3137 ldat->modified = FALSE;
3139 case PCAP_SWAPPED_MODIFIED_MAGIC:
3140 /* Host that wrote it out has a byte order opposite to
3141 ours, and was running a program using either ss990915
3142 or ss991029 libpcap. */
3143 ldat->byte_swapped = TRUE;
3144 ldat->modified = TRUE;
3147 /* Not a "libpcap" type we know about. */
3148 g_snprintf(errmsg, errmsgl, "Unrecognized libpcap format");
3152 /* Read the rest of the header */
3154 while (bytes_read < sizeof(struct pcap_hdr)) {
3155 b = read(fd, ((char *)hdr)+bytes_read,
3156 sizeof(struct pcap_hdr) - bytes_read);
3159 g_snprintf(errmsg, errmsgl, "End of file on pipe during open");
3161 g_snprintf(errmsg, errmsgl, "Error on pipe during open: %s",
3168 if (ldat->byte_swapped) {
3169 /* Byte-swap the header fields about which we care. */
3170 hdr->version_major = BSWAP16(hdr->version_major);
3171 hdr->version_minor = BSWAP16(hdr->version_minor);
3172 hdr->snaplen = BSWAP32(hdr->snaplen);
3173 hdr->network = BSWAP32(hdr->network);
3176 if (hdr->version_major < 2) {
3177 g_snprintf(errmsg, errmsgl, "Unable to read old libpcap format");
3181 ldat->pipe_state = STATE_EXPECT_REC_HDR;
3182 ldat->pipe_err = PIPOK;
3186 ldat->pipe_err = PIPERR;
3191 /* We read one record from the pipe, take care of byte order in the record
3192 * header, write the record in the capture file, and update capture statistics. */
3195 pipe_dispatch(int fd, loop_data *ldat, struct pcap_hdr *hdr,
3196 struct pcaprec_modified_hdr *rechdr, guchar *data,
3197 char *errmsg, int errmsgl)
3199 struct pcap_pkthdr phdr;
3201 enum { PD_REC_HDR_READ, PD_DATA_READ, PD_PIPE_EOF, PD_PIPE_ERR,
3204 switch (ldat->pipe_state) {
3206 case STATE_EXPECT_REC_HDR:
3207 ldat->bytes_to_read = ldat->modified ?
3208 sizeof(struct pcaprec_modified_hdr) : sizeof(struct pcaprec_hdr);
3209 ldat->bytes_read = 0;
3210 ldat->pipe_state = STATE_READ_REC_HDR;
3213 case STATE_READ_REC_HDR:
3214 b = read(fd, ((char *)rechdr)+ldat->bytes_read,
3215 ldat->bytes_to_read - ldat->bytes_read);
3218 result = PD_PIPE_EOF;
3220 result = PD_PIPE_ERR;
3223 if ((ldat->bytes_read += b) < ldat->bytes_to_read)
3225 result = PD_REC_HDR_READ;
3228 case STATE_EXPECT_DATA:
3229 ldat->bytes_read = 0;
3230 ldat->pipe_state = STATE_READ_DATA;
3233 case STATE_READ_DATA:
3234 b = read(fd, data+ldat->bytes_read, rechdr->hdr.incl_len - ldat->bytes_read);
3237 result = PD_PIPE_EOF;
3239 result = PD_PIPE_ERR;
3242 if ((ldat->bytes_read += b) < rechdr->hdr.incl_len)
3244 result = PD_DATA_READ;
3248 g_snprintf(errmsg, errmsgl, "pipe_dispatch: invalid state");
3251 } /* switch (ldat->pipe_state) */
3254 * We've now read as much data as we were expecting, so process it.
3258 case PD_REC_HDR_READ:
3259 /* We've read the header. Take care of byte order. */
3260 adjust_header(ldat, hdr, &rechdr->hdr);
3261 if (rechdr->hdr.incl_len > WTAP_MAX_PACKET_SIZE) {
3262 g_snprintf(errmsg, errmsgl, "Frame %u too long (%d bytes)",
3263 ldat->packet_count+1, rechdr->hdr.incl_len);
3266 ldat->pipe_state = STATE_EXPECT_DATA;
3270 /* Fill in a "struct pcap_pkthdr", and process the packet. */
3271 phdr.ts.tv_sec = rechdr->hdr.ts_sec;
3272 phdr.ts.tv_usec = rechdr->hdr.ts_usec;
3273 phdr.caplen = rechdr->hdr.incl_len;
3274 phdr.len = rechdr->hdr.orig_len;
3276 capture_pcap_cb((guchar *)ldat, &phdr, data);
3278 ldat->pipe_state = STATE_EXPECT_REC_HDR;
3282 ldat->pipe_err = PIPEOF;
3286 g_snprintf(errmsg, errmsgl, "Error reading from pipe: %s",
3293 ldat->pipe_err = PIPERR;
3294 /* Return here rather than inside the switch to prevent GCC warning */
3298 #endif /* HAVE_LIBPCAP */
3301 * General errors are reported with an console message in Tethereal.
3304 failure_message(const char *msg_format, va_list ap)
3306 fprintf(stderr, "tethereal: ");
3307 vfprintf(stderr, msg_format, ap);
3308 fprintf(stderr, "\n");
3312 * Read errors are reported with an console message in Tethereal.
3315 read_failure_message(const char *filename, int err)
3317 fprintf(stderr, "tethereal: An error occurred while reading from the file \"%s\": %s.\n",
3318 filename, strerror(err));