5 * Ethereal - Network traffic analyzer
6 * By Gerald Combs <gerald@ethereal.com>
7 * Copyright 1998 Gerald Combs
9 * Text-mode variant, by Gilbert Ramirez <gram@alumni.rice.edu>
10 * and Guy Harris <guy@alum.mit.edu>.
12 * This program is free software; you can redistribute it and/or
13 * modify it under the terms of the GNU General Public License
14 * as published by the Free Software Foundation; either version 2
15 * of the License, or (at your option) any later version.
17 * This program is distributed in the hope that it will be useful,
18 * but WITHOUT ANY WARRANTY; without even the implied warranty of
19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
20 * GNU General Public License for more details.
22 * You should have received a copy of the GNU General Public License
23 * along with this program; if not, write to the Free Software
24 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
50 #ifdef HAVE_SYS_STAT_H
51 # include <sys/stat.h>
54 #ifdef NEED_STRERROR_H
63 #include <epan/epan.h>
64 #include <epan/filesystem.h>
67 #include <epan/timestamp.h>
68 #include <epan/packet.h>
70 #include "disabled_protos.h"
71 #include <epan/prefs.h>
72 #include <epan/column.h>
74 #include <epan/addr_resolv.h>
76 #include "clopts_common.h"
77 #include "version_info.h"
78 #include <epan/conversation.h>
79 #include <epan/plugins.h>
81 #include "conditions.h"
82 #include "capture_stop_conditions.h"
83 #include "ringbuffer.h"
84 #include "capture_ui_utils.h"
85 #include <epan/epan_dissect.h>
87 #include <epan/stat_cmd_args.h>
88 #include <epan/timestamp.h>
93 #include "pcap-util.h"
94 #include <wiretap/wtap-capture.h>
95 #include <wiretap/libpcap.h>
97 #include "capture-wpcap.h"
100 #endif /* HAVE_LIBPCAP */
101 #include "epan/emem.h"
104 * This is the template for the decode as option; it is shared between the
105 * various functions that output the usage for this parameter.
107 static const gchar decode_as_arg_template[] = "<layer_type>==<selector>,<decode_as_protocol>";
109 static nstime_t first_ts;
110 static nstime_t prev_ts;
111 static GString *comp_info_str, *runtime_info_str;
113 static gboolean print_packet_info; /* TRUE if we're to print packet information */
115 * The way the packet decode is to be written.
118 WRITE_TEXT, /* summary or detail text */
119 WRITE_XML /* PDML or PSML */
120 /* Add CSV and the like here */
122 static output_action_e output_action;
123 static gboolean do_dissection; /* TRUE if we have to dissect each packet */
124 static gboolean verbose;
125 static gboolean print_hex;
126 static gboolean line_buffered;
127 static guint32 cum_bytes = 0;
128 static print_format_e print_format = PR_FMT_TEXT;
129 static print_stream_t *print_stream;
133 * TRUE if we're to print packet counts to keep track of captured packets.
135 static gboolean print_packet_counts;
137 typedef struct _loop_data {
138 gboolean go; /* TRUE as long as we're supposed to keep capturing */
140 gboolean from_pipe; /* TRUE if we are capturing data from a pipe */
142 char *save_file; /* Name of file to which we're writing */
145 gboolean output_to_pipe;
148 gboolean modified; /* TRUE if data in the pipe uses modified pcap headers */
149 gboolean byte_swapped; /* TRUE if data in the pipe is byte swapped */
150 unsigned int bytes_to_read, bytes_read; /* Used by pipe_dispatch */
152 STATE_EXPECT_REC_HDR, STATE_READ_REC_HDR,
153 STATE_EXPECT_DATA, STATE_READ_DATA
155 enum { PIPOK, PIPEOF, PIPERR, PIPNEXIST } pipe_err;
162 static capture_options capture_opts;
166 static gboolean infodelay; /* if TRUE, don't print capture info in SIGINFO handler */
167 static gboolean infoprint; /* if TRUE, print capture info after clearing infodelay */
169 #endif /* HAVE_LIBPCAP */
172 static int capture(char *, int);
173 static void capture_pcap_cb(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 t" PACKAGE " " VERSION "%s"
223 "\n (C) 1998-2005 Gerald Combs <gerald@ethereal.com>"
226 svnversion, comp_info_str->str, runtime_info_str->str);
231 fprintf(output, "\nt%s [ -vh ] [ -DlLnpqSVx ] [ -a <capture autostop condition> ] ...\n",
233 fprintf(output, "\t[ -b <capture ring buffer option> ] ... [ -c <capture packet count> ]\n");
234 fprintf(output, "\t[ -d %s ] ...\n", decode_as_arg_template);
235 fprintf(output, "\t[ -f <capture filter> ] [ -F <output file type> ]\n");
236 fprintf(output, "\t[ -i <capture interface> ] [ -N <name resolving flags> ]\n");
237 fprintf(output, "\t[ -o <preference setting> ] ... [ -r <infile> ]\n");
238 fprintf(output, "\t[ -R <read (display) filter> ] [ -s <capture snaplen> ]\n");
239 fprintf(output, "\t[ -t <time stamp format> ] [ -T pdml|ps|psml|text ]\n");
240 fprintf(output, "\t[ -w <savefile> ] [ -y <capture link type> ] [ -z <statistics> ]\n");
242 fprintf(output, "\nt%s [ -vh ] [ -lnVx ]\n", PACKAGE);
243 fprintf(output, "\t[ -d %s ] ...\n", decode_as_arg_template);
244 fprintf(output, "\t[ -F <output file type> ] [ -N <name resolving flags> ]\n");
245 fprintf(output, "\t[ -o <preference setting> ] ... [ -r <infile> ]\n");
246 fprintf(output, "\t[ -R <read (display) filter> ] \t[ -t <time stamp format> ]\n");
247 fprintf(output, "\t[ -T pdml|ps|psml|text ] [ -w <savefile> ] [ -z <statistics ]\n");
249 fprintf(output, "Valid file type arguments to the \"-F\" flag:\n");
250 for (i = 0; i < WTAP_NUM_FILE_TYPES; i++) {
251 if (wtap_dump_can_open(i))
252 fprintf(output, "\t%s - %s\n",
253 wtap_file_type_short_string(i), wtap_file_type_string(i));
255 fprintf(output, "\tdefault is libpcap\n");
259 * For a dissector table, print on the stream described by output,
260 * its short name (which is what's used in the "-d" option) and its
264 display_dissector_table_names(char *table_name, const char *ui_name,
267 fprintf((FILE *)output, "\t%s (%s)\n", table_name, ui_name);
271 * For a dissector handle, print on the stream described by output,
272 * the filter name (which is what's used in the "-d" option) and the full
273 * name for the protocol that corresponds to this handle.
276 display_dissector_names(const gchar *table _U_, gpointer handle, gpointer output)
279 const gchar* proto_filter_name;
280 const gchar* proto_ui_name;
282 proto_id = dissector_handle_get_protocol_index((dissector_handle_t)handle);
284 if (proto_id != -1) {
285 proto_filter_name = proto_get_protocol_filter_name(proto_id);
286 proto_ui_name = proto_get_protocol_name(proto_id);
287 g_assert(proto_filter_name != NULL);
288 g_assert(proto_ui_name != NULL);
290 fprintf((FILE *)output, "\t%s (%s)\n",
297 * The protocol_name_search structure is used by find_protocol_name_func()
298 * to pass parameters and store results
300 struct protocol_name_search{
301 gchar *searched_name; /* Protocol filter name we are looking for */
302 dissector_handle_t matched_handle; /* Handle for a dissector whose protocol has the specified filter name */
303 guint nb_match; /* How many dissectors matched searched_name */
305 typedef struct protocol_name_search *protocol_name_search_t;
308 * This function parses all dissectors associated with a table to find the
309 * one whose protocol has the specified filter name. It is called
310 * as a reference function in a call to dissector_table_foreach_handle.
311 * The name we are looking for, as well as the results, are stored in the
312 * protocol_name_search struct pointed to by user_data.
313 * If called using dissector_table_foreach_handle, we actually parse the
314 * whole list of dissectors.
317 find_protocol_name_func(const gchar *table _U_, gpointer handle, gpointer user_data)
321 const gchar *protocol_filter_name;
322 protocol_name_search_t search_info;
326 search_info = (protocol_name_search_t)user_data;
328 proto_id = dissector_handle_get_protocol_index((dissector_handle_t)handle);
329 if (proto_id != -1) {
330 protocol_filter_name = proto_get_protocol_filter_name(proto_id);
331 g_assert(protocol_filter_name != NULL);
332 if (strcmp(protocol_filter_name, search_info->searched_name) == 0) {
334 if (search_info->nb_match == 0) {
335 /* Record this handle only if this is the first match */
336 search_info->matched_handle = (dissector_handle_t)handle; /* Record the handle for this matching dissector */
338 search_info->nb_match++;
344 * Print all layer type names supported.
345 * We send the output to the stream described by the handle output.
349 fprint_all_layer_types(FILE *output)
352 dissector_all_tables_foreach_table(display_dissector_table_names, (gpointer)output);
356 * Print all protocol names supported for a specific layer type.
357 * table_name contains the layer type name in which the search is performed.
358 * We send the output to the stream described by the handle output.
362 fprint_all_protocols_for_layer_types(FILE *output, gchar *table_name)
365 dissector_table_foreach_handle(table_name,
366 display_dissector_names,
371 * The function below parses the command-line parameters for the decode as
372 * feature (a string pointer by cl_param).
373 * It checks the format of the command-line, searches for a matching table
374 * and dissector. If a table/dissector match is not found, we display a
375 * summary of the available tables/dissectors (on stderr) and return FALSE.
376 * If everything is fine, we get the "Decode as" preference activated,
377 * then we return TRUE.
380 add_decode_as(const gchar *cl_param)
384 gchar *decoded_param;
385 gchar *remaining_param;
387 gchar *dissector_str;
388 dissector_handle_t dissector_matching;
389 dissector_table_t table_matching;
390 ftenum_t dissector_table_selector_type;
391 struct protocol_name_search user_protocol_name;
393 /* The following code will allocate and copy the command-line options in a string pointed by decoded_param */
396 decoded_param = g_malloc( sizeof(gchar) * (strlen(cl_param) + 1) ); /* Allocate enough space to have a working copy of the command-line parameter */
397 g_assert(decoded_param);
398 strcpy(decoded_param, cl_param);
401 /* The lines below will parse this string (modifying it) to extract all
402 necessary information. Note that decoded_param is still needed since
403 strings are not copied - we just save pointers. */
405 /* This section extracts a layer type (table_name) from decoded_param */
406 table_name = decoded_param; /* Layer type string starts from beginning */
408 remaining_param = strchr(table_name, '=');
409 if (remaining_param == NULL) {
410 fprintf(stderr, "tethereal: Parameter \"%s\" doesn't follow the template \"%s\"\n", cl_param, decode_as_arg_template);
411 /* If the argument does not follow the template, carry on anyway to check
412 if the table name is at least correct. If remaining_param is NULL,
413 we'll exit anyway further down */
416 *remaining_param = '\0'; /* Terminate the layer type string (table_name) where '=' was detected */
419 /* Remove leading and trailing spaces from the table name */
420 while ( table_name[0] == ' ' )
422 while ( table_name[strlen(table_name) - 1] == ' ' )
423 table_name[strlen(table_name) - 1] = '\0'; /* Note: if empty string, while loop will eventually exit */
425 /* The following part searches a table matching with the layer type specified */
426 table_matching = NULL;
428 /* Look for the requested table */
429 if ( !(*(table_name)) ) { /* Is the table name empty, if so, don't even search for anything, display a message */
430 fprintf(stderr, "tethereal: No layer type specified\n"); /* Note, we don't exit here, but table_matching will remain NULL, so we exit below */
433 table_matching = find_dissector_table(table_name);
434 if (!table_matching) {
435 fprintf(stderr, "tethereal: Unknown layer type -- %s\n", table_name); /* Note, we don't exit here, but table_matching will remain NULL, so we exit below */
439 if (!table_matching) {
440 /* Display a list of supported layer types to help the user, if the
441 specified layer type was not found */
442 fprintf(stderr, "tethereal: Valid layer types are:\n");
443 fprint_all_layer_types(stderr);
445 if (remaining_param == NULL || !table_matching) {
446 /* Exit if the layer type was not found, or if no '=' separator was found
448 g_free(decoded_param);
452 if (*(remaining_param + 1) != '=') { /* Check for "==" and not only '=' */
453 fprintf(stderr, "tethereal: WARNING: -d requires \"==\" instead of \"=\". Option will be treated as \"%s==%s\"\n", table_name, remaining_param + 1);
456 remaining_param++; /* Move to the second '=' */
457 *remaining_param = '\0'; /* Remove the second '=' */
459 remaining_param++; /* Position after the layer type string */
461 /* This section extracts a selector value (selector_str) from decoded_param */
463 selector_str = remaining_param; /* Next part starts with the selector number */
465 remaining_param = strchr(selector_str, ',');
466 if (remaining_param == NULL) {
467 fprintf(stderr, "tethereal: Parameter \"%s\" doesn't follow the template \"%s\"\n", cl_param, decode_as_arg_template);
468 /* If the argument does not follow the template, carry on anyway to check
469 if the selector value is at least correct. If remaining_param is NULL,
470 we'll exit anyway further down */
473 *remaining_param = '\0'; /* Terminate the selector number string (selector_str) where ',' was detected */
476 dissector_table_selector_type = get_dissector_table_selector_type(table_name);
478 switch (dissector_table_selector_type) {
484 /* The selector for this table is an unsigned number. Parse it as such.
485 There's no need to remove leading and trailing spaces from the
486 selector number string, because sscanf will do that for us. */
487 if ( sscanf(selector_str, "%u", &selector) != 1 ) {
488 fprintf(stderr, "tethereal: Invalid selector number \"%s\"\n", selector_str);
489 g_free(decoded_param);
496 /* The selector for this table is a string. */
500 /* There are currently no dissector tables with any types other
501 than the ones listed above. */
502 g_assert_not_reached();
505 if (remaining_param == NULL) {
506 /* Exit if no ',' separator was found (see above) */
507 fprintf(stderr, "tethereal: Valid protocols for layer type \"%s\" are:\n", table_name);
508 fprint_all_protocols_for_layer_types(stderr, table_name);
509 g_free(decoded_param);
513 remaining_param++; /* Position after the selector number string */
515 /* This section extracts a protocol filter name (dissector_str) from decoded_param */
517 dissector_str = remaining_param; /* All the rest of the string is the dissector (decode as protocol) name */
519 /* Remove leading and trailing spaces from the dissector name */
520 while ( dissector_str[0] == ' ' )
522 while ( dissector_str[strlen(dissector_str) - 1] == ' ' )
523 dissector_str[strlen(dissector_str) - 1] = '\0'; /* Note: if empty string, while loop will eventually exit */
525 dissector_matching = NULL;
527 /* We now have a pointer to the handle for the requested table inside the variable table_matching */
528 if ( ! (*dissector_str) ) { /* Is the dissector name empty, if so, don't even search for a matching dissector and display all dissectors found for the selected table */
529 fprintf(stderr, "tethereal: No protocol name specified\n"); /* Note, we don't exit here, but dissector_matching will remain NULL, so we exit below */
532 user_protocol_name.nb_match = 0;
533 user_protocol_name.searched_name = dissector_str;
534 user_protocol_name.matched_handle = NULL;
536 dissector_table_foreach_handle(table_name, find_protocol_name_func, &user_protocol_name); /* Go and perform the search for this dissector in the this table's dissectors' names and shortnames */
538 if (user_protocol_name.nb_match != 0) {
539 dissector_matching = user_protocol_name.matched_handle;
540 if (user_protocol_name.nb_match > 1) {
541 fprintf(stderr, "tethereal: WARNING: Protocol \"%s\" matched %u dissectors, first one will be used\n", dissector_str, user_protocol_name.nb_match);
545 /* OK, check whether the problem is that there isn't any such
546 protocol, or that there is but it's not specified as a protocol
547 that's valid for that dissector table.
548 Note, we don't exit here, but dissector_matching will remain NULL,
550 if (proto_get_id_by_filter_name(dissector_str) == -1) {
551 /* No such protocol */
552 fprintf(stderr, "tethereal: Unknown protocol -- \"%s\"\n", dissector_str);
554 fprintf(stderr, "tethereal: Protocol \"%s\" isn't valid for layer type \"%s\"\n",
555 dissector_str, table_name);
560 if (!dissector_matching) {
561 fprintf(stderr, "tethereal: Valid protocols for layer type \"%s\" are:\n", table_name);
562 fprint_all_protocols_for_layer_types(stderr, table_name);
563 g_free(decoded_param);
567 /* This is the end of the code that parses the command-line options.
568 All information is now stored in the variables:
572 The above variables that are strings are still pointing to areas within
573 decoded_parm. decoded_parm thus still needs to be kept allocated in
574 until we stop needing these variables
575 decoded_param will be deallocated at each exit point of this function */
578 /* We now have a pointer to the handle for the requested dissector
579 (requested protocol) inside the variable dissector_matching */
580 switch (dissector_table_selector_type) {
586 /* The selector for this table is an unsigned number. */
587 dissector_change(table_name, selector, dissector_matching);
592 /* The selector for this table is a string. */
593 dissector_change_string(table_name, selector_str, dissector_matching);
597 /* There are currently no dissector tables with any types other
598 than the ones listed above. */
599 g_assert_not_reached();
601 g_free(decoded_param); /* "Decode As" rule has been succesfully added */
606 main(int argc, char *argv[])
610 gboolean arg_error = FALSE;
616 char *gpf_path, *pf_path;
617 char *gdp_path, *dp_path;
618 int gpf_open_errno, gpf_read_errno;
619 int pf_open_errno, pf_read_errno;
620 int gdp_open_errno, gdp_read_errno;
621 int dp_open_errno, dp_read_errno;
624 gboolean capture_filter_specified = FALSE;
625 GList *if_list, *if_entry;
629 gchar err_str[PCAP_ERRBUF_SIZE];
630 gchar *cant_get_if_list_errstr;
631 gboolean list_link_layer_types = FALSE;
633 gboolean capture_option_specified = FALSE;
635 gboolean quiet = FALSE;
636 gchar *save_file = NULL;
637 int out_file_type = WTAP_FILE_PCAP;
638 gchar *cf_name = NULL, *rfilter = NULL;
640 gboolean start_capture = FALSE;
642 GList *lt_list, *lt_entry;
643 data_link_info_t *data_link_info;
645 #ifdef HAVE_PCAP_OPEN_DEAD
646 struct bpf_program fcode;
648 dfilter_t *rfcode = NULL;
652 /* initialize memory allocation subsystem */
657 capture_opts_init(&capture_opts, NULL /* cfile */);
660 timestamp_set_type(TS_RELATIVE);
661 timestamp_set_precision(TS_PREC_AUTO);
663 /* Register all dissectors; we must do this before checking for the
664 "-G" flag, as the "-G" flag dumps information registered by the
665 dissectors, and we must do it before we read the preferences, in
666 case any dissectors register preferences. */
667 epan_init(PLUGIN_DIR,register_all_protocols,register_all_protocol_handoffs,
668 failure_message,open_failure_message,read_failure_message);
670 /* Register all tap listeners; we do this before we parse the arguments,
671 as the "-z" argument can specify a registered tap. */
673 /* we register the plugin taps before the other taps because
674 stats_tree taps plugins will be registered as tap listeners
675 by stats_tree_stat.c and need to registered before that */
677 register_all_plugin_tap_listeners();
679 register_all_tap_listeners();
681 /* Now register the preferences for any non-dissector modules.
682 We must do that before we read the preferences as well. */
683 prefs_register_modules();
685 /* If invoked with the "-G" flag, we dump out information based on
686 the argument to the "-G" flag; if no argument is specified,
687 for backwards compatibility we dump out a glossary of display
690 We do this here to mirror what happens in the GTK+ version, although
691 it's not necessary here. */
692 handle_dashG_option(argc, argv, "tethereal");
694 /* Set the C-language locale to the native environment. */
695 setlocale(LC_ALL, "");
697 prefs = read_prefs(&gpf_open_errno, &gpf_read_errno, &gpf_path,
698 &pf_open_errno, &pf_read_errno, &pf_path);
699 if (gpf_path != NULL) {
700 if (gpf_open_errno != 0) {
701 fprintf(stderr, "Can't open global preferences file \"%s\": %s.\n",
702 pf_path, strerror(gpf_open_errno));
704 if (gpf_read_errno != 0) {
705 fprintf(stderr, "I/O error reading global preferences file \"%s\": %s.\n",
706 pf_path, strerror(gpf_read_errno));
709 if (pf_path != NULL) {
710 if (pf_open_errno != 0) {
711 fprintf(stderr, "Can't open your preferences file \"%s\": %s.\n", pf_path,
712 strerror(pf_open_errno));
714 if (pf_read_errno != 0) {
715 fprintf(stderr, "I/O error reading your preferences file \"%s\": %s.\n",
716 pf_path, strerror(pf_read_errno));
722 /* Set the name resolution code's flags from the preferences. */
723 g_resolv_flags = prefs->name_resolve;
725 /* Read the disabled protocols file. */
726 read_disabled_protos_list(&gdp_path, &gdp_open_errno, &gdp_read_errno,
727 &dp_path, &dp_open_errno, &dp_read_errno);
728 if (gdp_path != NULL) {
729 if (gdp_open_errno != 0) {
731 "Could not open global disabled protocols file\n\"%s\": %s.\n",
732 gdp_path, strerror(gdp_open_errno));
734 if (gdp_read_errno != 0) {
736 "I/O error reading global disabled protocols file\n\"%s\": %s.\n",
737 gdp_path, strerror(gdp_read_errno));
741 if (dp_path != NULL) {
742 if (dp_open_errno != 0) {
744 "Could not open your disabled protocols file\n\"%s\": %s.\n", dp_path,
745 strerror(dp_open_errno));
747 if (dp_read_errno != 0) {
749 "I/O error reading your disabled protocols file\n\"%s\": %s.\n", dp_path,
750 strerror(dp_read_errno));
756 /* Load Wpcap, if possible */
760 init_cap_file(&cfile);
762 /* Assemble the compile-time version information string */
763 comp_info_str = g_string_new("Compiled ");
764 get_compiled_version_info(comp_info_str);
766 /* Assemble the run-time version information string */
767 runtime_info_str = g_string_new("Running ");
768 get_runtime_version_info(runtime_info_str);
770 /* Print format defaults to this. */
771 print_format = PR_FMT_TEXT;
773 /* Now get our args */
774 while ((opt = getopt(argc, argv, "a:b:c:d:Df:F:hi:lLnN:o:pqr:R:s:St:T:vw:Vxy:z:")) != -1) {
776 case 'a': /* autostop criteria */
777 case 'b': /* Ringbuffer option */
778 case 'c': /* Capture xxx packets */
779 case 'f': /* capture filter */
780 case 'p': /* Don't capture in promiscuous mode */
781 case 's': /* Set the snapshot (capture) length */
782 case 'y': /* Set the pcap data link type */
784 capture_opts_add_opt(&capture_opts, "tethereal", opt, optarg, &start_capture);
786 capture_option_specified = TRUE;
790 case 'd': /* Decode as rule */
791 if (!add_decode_as(optarg))
794 case 'D': /* Print a list of capture devices */
796 if_list = get_interface_list(&err, err_str);
797 if (if_list == NULL) {
800 case CANT_GET_INTERFACE_LIST:
801 cant_get_if_list_errstr =
802 cant_get_if_list_error_message(err_str);
803 fprintf(stderr, "tethereal: %s\n", cant_get_if_list_errstr);
804 g_free(cant_get_if_list_errstr);
807 case NO_INTERFACES_FOUND:
808 fprintf(stderr, "tethereal: There are no interfaces on which a capture can be done\n");
813 i = 1; /* Interface id number */
814 for (if_entry = g_list_first(if_list); if_entry != NULL;
815 if_entry = g_list_next(if_entry)) {
816 if_info = if_entry->data;
817 printf("%d. %s", i++, if_info->name);
818 if (if_info->description != NULL)
819 printf(" (%s)", if_info->description);
822 free_interface_list(if_list);
825 capture_option_specified = TRUE;
830 out_file_type = wtap_short_string_to_file_type(optarg);
831 if (out_file_type < 0) {
832 fprintf(stderr, "tethereal: \"%s\" isn't a valid capture file type\n",
837 case 'h': /* Print help and exit */
841 case 'i': /* Use interface xxx */
844 * If the argument is a number, treat it as an index into the list
845 * of adapters, as printed by "tethereal -D".
847 * This should be OK on UNIX systems, as interfaces shouldn't have
848 * names that begin with digits. It can be useful on Windows, where
849 * more than one interface can have the same name.
851 adapter_index = strtol(optarg, &p, 10);
852 if (p != NULL && *p == '\0') {
853 if (adapter_index < 0) {
855 "tethereal: The specified adapter index is a negative number\n");
858 if (adapter_index > INT_MAX) {
860 "tethereal: The specified adapter index is too large (greater than %d)\n",
864 if (adapter_index == 0) {
865 fprintf(stderr, "tethereal: there is no interface with that adapter index\n");
868 if_list = get_interface_list(&err, err_str);
869 if (if_list == NULL) {
872 case CANT_GET_INTERFACE_LIST:
873 cant_get_if_list_errstr =
874 cant_get_if_list_error_message(err_str);
875 fprintf(stderr, "tethereal: %s\n", cant_get_if_list_errstr);
876 g_free(cant_get_if_list_errstr);
879 case NO_INTERFACES_FOUND:
880 fprintf(stderr, "tethereal: There are no interfaces on which a capture can be done\n");
885 if_info = g_list_nth_data(if_list, adapter_index - 1);
886 if (if_info == NULL) {
887 fprintf(stderr, "tethereal: there is no interface with that adapter index\n");
890 capture_opts.iface = g_strdup(if_info->name);
891 free_interface_list(if_list);
893 capture_opts.iface = g_strdup(optarg);
895 capture_option_specified = TRUE;
899 case 'l': /* "Line-buffer" standard output */
900 /* This isn't line-buffering, strictly speaking, it's just
901 flushing the standard output after the information for
902 each packet is printed; however, that should be good
903 enough for all the purposes to which "-l" is put (and
904 is probably actually better for "-V", as it does fewer
907 See the comment in "process_packet()" for an explanation of
908 why we do that, and why we don't just use "setvbuf()" to
909 make the standard output line-buffered (short version: in
910 Windows, "line-buffered" is the same as "fully-buffered",
911 and the output buffer is only flushed when it fills up). */
912 line_buffered = TRUE;
914 case 'L': /* Print list of link-layer types and exit */
916 list_link_layer_types = TRUE;
919 capture_option_specified = TRUE;
923 case 'n': /* No name resolution */
924 g_resolv_flags = RESOLV_NONE;
926 case 'N': /* Select what types of addresses/port #s to resolve */
927 if (g_resolv_flags == RESOLV_ALL)
928 g_resolv_flags = RESOLV_NONE;
929 badopt = string_to_name_resolve(optarg, &g_resolv_flags);
930 if (badopt != '\0') {
931 fprintf(stderr, "tethereal: -N specifies unknown resolving option '%c'; valid options are 'm', 'n', and 't'\n",
936 case 'o': /* Override preference from command line */
937 switch (prefs_set_pref(optarg)) {
939 case PREFS_SET_SYNTAX_ERR:
940 fprintf(stderr, "tethereal: Invalid -o flag \"%s\"\n", optarg);
944 case PREFS_SET_NO_SUCH_PREF:
945 case PREFS_SET_OBSOLETE:
946 fprintf(stderr, "tethereal: -o flag \"%s\" specifies unknown preference\n",
952 case 'q': /* Quiet */
955 case 'r': /* Read capture file xxx */
956 cf_name = g_strdup(optarg);
958 case 'R': /* Read file filter */
961 case 'S': /* show packets in real time */
962 print_packet_info = TRUE;
964 case 't': /* Time stamp type */
965 if (strcmp(optarg, "r") == 0)
966 timestamp_set_type(TS_RELATIVE);
967 else if (strcmp(optarg, "a") == 0)
968 timestamp_set_type(TS_ABSOLUTE);
969 else if (strcmp(optarg, "ad") == 0)
970 timestamp_set_type(TS_ABSOLUTE_WITH_DATE);
971 else if (strcmp(optarg, "d") == 0)
972 timestamp_set_type(TS_DELTA);
974 fprintf(stderr, "tethereal: Invalid time stamp type \"%s\"\n",
976 fprintf(stderr, "It must be \"r\" for relative, \"a\" for absolute,\n");
977 fprintf(stderr, "\"ad\" for absolute with date, or \"d\" for delta.\n");
981 case 'T': /* printing Type */
982 if (strcmp(optarg, "text") == 0) {
983 output_action = WRITE_TEXT;
984 print_format = PR_FMT_TEXT;
985 } else if (strcmp(optarg, "ps") == 0) {
986 output_action = WRITE_TEXT;
987 print_format = PR_FMT_PS;
988 } else if (strcmp(optarg, "pdml") == 0) {
989 output_action = WRITE_XML;
991 } else if (strcmp(optarg, "psml") == 0) {
992 output_action = WRITE_XML;
995 fprintf(stderr, "tethereal: Invalid -T parameter.\n");
996 fprintf(stderr, "It must be \"ps\", \"text\", \"pdml\", or \"psml\".\n");
1000 case 'v': /* Show version and exit */
1001 printf("t" PACKAGE " " VERSION "%s\n%s\n%s\n",
1002 svnversion, comp_info_str->str, runtime_info_str->str);
1005 case 'w': /* Write to capture file xxx */
1006 save_file = g_strdup(optarg);
1008 case 'V': /* Verbose */
1011 case 'x': /* Print packet data in hex (and ASCII) */
1015 /* We won't call the init function for the stat this soon
1016 as it would disallow MATE's fields (which are registered
1017 by the preferences set callback) from being used as
1018 part of a tap filter. Instead, we just add the argument
1019 to a list of stat arguments. */
1020 if (!process_stat_cmd_arg(optarg)) {
1021 fprintf(stderr,"tethereal: invalid -z argument.\n");
1022 fprintf(stderr," -z argument must be one of :\n");
1023 list_stat_cmd_args();
1028 case '?': /* Bad flag - print usage message */
1034 /* If no capture filter or read filter has been specified, and there are
1035 still command-line arguments, treat them as the tokens of a capture
1036 filter (if no "-r" flag was specified) or a read filter (if a "-r"
1037 flag was specified. */
1038 if (optind < argc) {
1039 if (cf_name != NULL) {
1040 if (rfilter != NULL) {
1042 "tethereal: Read filters were specified both with \"-R\" and with additional command-line arguments\n");
1045 rfilter = get_args_as_string(argc, argv, optind);
1048 if (capture_filter_specified) {
1050 "tethereal: Capture filters were specified both with \"-f\" and with additional command-line arguments\n");
1053 capture_opts.cfilter = get_args_as_string(argc, argv, optind);
1055 capture_option_specified = TRUE;
1060 /* See if we're writing a capture file and the file is a pipe */
1062 ld.output_to_pipe = FALSE;
1064 if (save_file != NULL) {
1065 /* We're writing to a capture file. */
1066 if (strcmp(save_file, "-") == 0) {
1067 /* Write to the standard output. */
1069 save_file = g_strdup("");
1071 /* XXX - should we check whether it's a pipe? It's arguably
1072 silly to do "-w - >output_file" rather than "-w output_file",
1073 but by not checking we might be violating the Principle Of
1074 Least Astonishment. */
1075 ld.output_to_pipe = TRUE;
1080 err = test_for_fifo(save_file);
1083 case ENOENT: /* it doesn't exist, so we'll be creating it,
1084 and it won't be a FIFO */
1085 case 0: /* found it, but it's not a FIFO */
1088 case ESPIPE: /* it is a FIFO */
1089 ld.output_to_pipe = TRUE;
1092 default: /* couldn't stat it */
1094 "tethereal: Error testing whether capture file is a pipe: %s\n",
1101 /* We're not writing to a file, so we should print packet information
1102 unless "-q" was specified. */
1104 print_packet_info = TRUE;
1107 #ifndef HAVE_LIBPCAP
1108 if (capture_option_specified)
1109 fprintf(stderr, "This version of Tethereal was not built with support for capturing packets.\n");
1116 /* We don't support capture filters when reading from a capture file
1117 (the BPF compiler doesn't support all link-layer types that we
1118 support in capture files we read). */
1120 if (cf_name != NULL) {
1121 if (capture_filter_specified) {
1123 "tethereal: Only read filters, not capture filters, can be specified when reading a capture file.\n");
1130 if (output_action != WRITE_TEXT) {
1131 fprintf(stderr, "tethereal: Raw packet hex data can only be printed as text or PostScript\n");
1137 if (list_link_layer_types) {
1138 /* We're supposed to list the link-layer types for an interface;
1139 did the user also specify a capture file to be read? */
1141 /* Yes - that's bogus. */
1142 fprintf(stderr, "tethereal: You can't specify -L and a capture file to be read.\n");
1145 /* No - did they specify a ring buffer option? */
1146 if (capture_opts.multi_files_on) {
1147 fprintf(stderr, "tethereal: Ring buffer requested, but a capture isn't being done.\n");
1151 /* If they didn't specify a "-w" flag, but specified a maximum capture
1152 file size, tell them that this doesn't work, and exit. */
1153 if (capture_opts.has_autostop_filesize && save_file == NULL) {
1154 fprintf(stderr, "tethereal: Maximum capture file size specified, but "
1155 "capture isn't being saved to a file.\n");
1159 if (capture_opts.multi_files_on) {
1160 /* Ring buffer works only under certain conditions:
1161 a) ring buffer does not work if you're not saving the capture to
1163 b) ring buffer only works if you're saving in libpcap format;
1164 c) it makes no sense to enable the ring buffer if the maximum
1165 file size is set to "infinite";
1166 d) file must not be a pipe. */
1167 if (save_file == NULL) {
1168 fprintf(stderr, "tethereal: Ring buffer requested, but "
1169 "capture isn't being saved to a file.\n");
1172 if (out_file_type != WTAP_FILE_PCAP) {
1173 fprintf(stderr, "tethereal: Ring buffer requested, but "
1174 "capture isn't being saved in libpcap format.\n");
1177 if (!capture_opts.has_autostop_filesize) {
1178 fprintf(stderr, "tethereal: Ring buffer requested, but "
1179 "no maximum capture file size was specified.\n");
1182 if (ld.output_to_pipe) {
1183 fprintf(stderr, "tethereal: Ring buffer requested, but "
1184 "capture file is a pipe.\n");
1192 /* Start windows sockets */
1193 WSAStartup( MAKEWORD( 1, 1 ), &wsaData );
1196 /* Notify all registered modules that have had any of their preferences
1197 changed either from one of the preferences file or from the command
1198 line that their preferences have changed. */
1201 /* At this point MATE will have registered its field array so we can
1202 have a tap filter with one of MATE's late-registered fields as part
1203 of the filter. We can now process all the "-z" arguments. */
1204 start_requested_stats();
1206 /* disabled protocols as per configuration file */
1207 if (gdp_path == NULL && dp_path == NULL) {
1208 set_disabled_protos_list();
1211 /* Build the column format array */
1212 col_setup(&cfile.cinfo, prefs->num_cols);
1213 for (i = 0; i < cfile.cinfo.num_cols; i++) {
1214 cfile.cinfo.col_fmt[i] = get_column_format(i);
1215 cfile.cinfo.col_title[i] = g_strdup(get_column_title(i));
1216 cfile.cinfo.fmt_matx[i] = (gboolean *) g_malloc0(sizeof(gboolean) *
1218 get_column_format_matches(cfile.cinfo.fmt_matx[i], cfile.cinfo.col_fmt[i]);
1219 cfile.cinfo.col_data[i] = NULL;
1220 if (cfile.cinfo.col_fmt[i] == COL_INFO)
1221 cfile.cinfo.col_buf[i] = (gchar *) g_malloc(sizeof(gchar) * COL_MAX_INFO_LEN);
1223 cfile.cinfo.col_buf[i] = (gchar *) g_malloc(sizeof(gchar) * COL_MAX_LEN);
1224 cfile.cinfo.col_fence[i] = 0;
1225 cfile.cinfo.col_expr[i] = (gchar *) g_malloc(sizeof(gchar) * COL_MAX_LEN);
1226 cfile.cinfo.col_expr_val[i] = (gchar *) g_malloc(sizeof(gchar) * COL_MAX_LEN);
1229 for (i = 0; i < cfile.cinfo.num_cols; i++) {
1232 for (j = 0; j < NUM_COL_FMTS; j++) {
1233 if (!cfile.cinfo.fmt_matx[i][j])
1236 if (cfile.cinfo.col_first[j] == -1)
1237 cfile.cinfo.col_first[j] = i;
1238 cfile.cinfo.col_last[j] = i;
1243 if (capture_opts.snaplen < 1)
1244 capture_opts.snaplen = WTAP_MAX_PACKET_SIZE;
1245 else if (capture_opts.snaplen < MIN_PACKET_SIZE)
1246 capture_opts.snaplen = MIN_PACKET_SIZE;
1248 /* Check the value range of the ring_num_files parameter */
1249 if (capture_opts.ring_num_files > RINGBUFFER_MAX_NUM_FILES)
1250 capture_opts.ring_num_files = RINGBUFFER_MAX_NUM_FILES;
1251 #if RINGBUFFER_MIN_NUM_FILES > 0
1252 else if (capture_opts.ring_num_files < RINGBUFFER_MIN_NUM_FILES)
1253 capture_opts.ring_num_files = RINGBUFFER_MIN_NUM_FILES;
1257 if (rfilter != NULL) {
1258 if (!dfilter_compile(rfilter, &rfcode)) {
1259 fprintf(stderr, "tethereal: %s\n", dfilter_error_msg);
1261 #ifdef HAVE_PCAP_OPEN_DEAD
1265 pc = pcap_open_dead(DLT_EN10MB, MIN_PACKET_SIZE);
1267 if (pcap_compile(pc, &fcode, rfilter, 0, 0) != -1) {
1269 " Note: That display filter code looks like a valid capture filter;\n"
1270 " maybe you mixed them up?\n");
1279 cfile.rfcode = rfcode;
1281 if (print_packet_info) {
1282 /* If we're printing as text or PostScript, we have
1283 to create a print stream. */
1284 if (output_action == WRITE_TEXT) {
1285 switch (print_format) {
1288 print_stream = print_stream_text_stdio_new(stdout);
1292 print_stream = print_stream_ps_stdio_new(stdout);
1296 g_assert_not_reached();
1301 /* We have to dissect each packet if:
1303 we're printing information about each packet;
1305 we're using a read filter on the packets;
1307 we're using any taps. */
1308 do_dissection = print_packet_info || rfcode || have_tap_listeners();
1312 * We're reading a capture file.
1317 * Immediately relinquish any set-UID or set-GID privileges we have;
1318 * we must not be allowed to read any capture files the user running
1319 * Tethereal can't open.
1325 if (cf_open(&cfile, cf_name, FALSE, &err) != CF_OK) {
1330 /* Set timestamp precision; there should arguably be a command-line
1331 option to let the user set this. */
1332 switch(wtap_file_tsprecision(cfile.wth)) {
1333 case(WTAP_FILE_TSPREC_SEC):
1334 timestamp_set_precision(TS_PREC_AUTO_SEC);
1336 case(WTAP_FILE_TSPREC_DSEC):
1337 timestamp_set_precision(TS_PREC_AUTO_DSEC);
1339 case(WTAP_FILE_TSPREC_CSEC):
1340 timestamp_set_precision(TS_PREC_AUTO_CSEC);
1342 case(WTAP_FILE_TSPREC_MSEC):
1343 timestamp_set_precision(TS_PREC_AUTO_MSEC);
1345 case(WTAP_FILE_TSPREC_USEC):
1346 timestamp_set_precision(TS_PREC_AUTO_USEC);
1348 case(WTAP_FILE_TSPREC_NSEC):
1349 timestamp_set_precision(TS_PREC_AUTO_NSEC);
1352 g_assert_not_reached();
1355 /* Process the packets in the file */
1356 err = load_cap_file(&cfile, save_file, out_file_type);
1363 /* No capture file specified, so we're supposed to do a live capture
1364 (or get a list of link-layer types for a live capture device);
1365 do we have support for live captures? */
1370 fprintf(stderr, "tethereal: Could not load wpcap.dll.\n");
1375 /* Yes; did the user specify an interface to use? */
1376 if (capture_opts.iface == NULL) {
1377 /* No - is a default specified in the preferences file? */
1378 if (prefs->capture_device != NULL) {
1380 if_text = strrchr(prefs->capture_device, ' ');
1381 if (if_text == NULL) {
1382 capture_opts.iface = g_strdup(prefs->capture_device);
1384 capture_opts.iface = g_strdup(if_text + 1); /* Skip over space */
1387 /* No - pick the first one from the list of interfaces. */
1388 if_list = get_interface_list(&err, err_str);
1389 if (if_list == NULL) {
1392 case CANT_GET_INTERFACE_LIST:
1393 cant_get_if_list_errstr = cant_get_if_list_error_message(err_str);
1394 fprintf(stderr, "tethereal: %s\n", cant_get_if_list_errstr);
1395 g_free(cant_get_if_list_errstr);
1398 case NO_INTERFACES_FOUND:
1399 fprintf(stderr, "tethereal: There are no interfaces on which a capture can be done\n");
1404 if_info = if_list->data; /* first interface */
1405 capture_opts.iface = g_strdup(if_info->name);
1406 free_interface_list(if_list);
1410 if (list_link_layer_types) {
1411 /* We were asked to list the link-layer types for an interface.
1412 Get the list of link-layer types for the capture device. */
1413 lt_list = get_pcap_linktype_list(capture_opts.iface, err_str);
1414 if (lt_list == NULL) {
1415 if (err_str[0] != '\0') {
1416 fprintf(stderr, "tethereal: The list of data link types for the capture device could not be obtained (%s).\n"
1417 "Please check to make sure you have sufficient permissions, and that\n"
1418 "you have the proper interface or pipe specified.\n", err_str);
1420 fprintf(stderr, "tethereal: The capture device has no data link types.\n");
1423 fprintf(stderr, "Data link types (use option -y to set):\n");
1424 for (lt_entry = lt_list; lt_entry != NULL;
1425 lt_entry = g_list_next(lt_entry)) {
1426 data_link_info = lt_entry->data;
1427 fprintf(stderr, " %s", data_link_info->name);
1428 if (data_link_info->description != NULL)
1429 fprintf(stderr, " (%s)", data_link_info->description);
1431 fprintf(stderr, " (not supported)");
1434 free_pcap_linktype_list(lt_list);
1440 * The user didn't ask us not to print a count of packets as
1441 * they arrive, so do so.
1443 print_packet_counts = TRUE;
1446 /* For now, assume libpcap gives microsecond precision. */
1447 timestamp_set_precision(TS_PREC_AUTO_USEC);
1449 capture(save_file, out_file_type);
1451 if (capture_opts.multi_files_on) {
1455 /* No - complain. */
1456 fprintf(stderr, "This version of Tethereal was not built with support for capturing packets.\n");
1461 draw_tap_listeners(TRUE);
1468 /* Do the low-level work of a capture.
1469 Returns TRUE if it succeeds, FALSE otherwise. */
1471 static condition *volatile cnd_ring_timeout = NULL; /* this must be visible in process_packet */
1474 capture(char *save_file, int out_file_type)
1478 gchar open_err_str[PCAP_ERRBUF_SIZE];
1479 gchar lookup_net_err_str[PCAP_ERRBUF_SIZE];
1480 bpf_u_int32 netnum, netmask;
1481 struct bpf_program fcode;
1482 const char *set_linktype_err_str;
1484 int volatile volatile_err = 0;
1485 int volatile inpkts = 0;
1487 char errmsg[1024+1];
1488 condition *volatile cnd_stop_capturesize = NULL;
1489 condition *volatile cnd_stop_timeout = NULL;
1492 void (*oldhandler)(int);
1493 static const char ppamsg[] = "can't find PPA for ";
1494 const char *libpcap_warn;
1495 volatile int pipe_fd = -1;
1496 struct pcap_hdr hdr;
1497 struct pcaprec_modified_hdr rechdr;
1498 guchar pcap_data[WTAP_MAX_PACKET_SIZE];
1500 struct pcap_stat stats;
1503 dfilter_t *rfcode = NULL;
1506 /* Initialize all data structures used for dissection. */
1509 ld.linktype = WTAP_ENCAP_UNKNOWN;
1512 /* Open the network interface to capture from it.
1513 Some versions of libpcap may put warnings into the error buffer
1514 if they succeed; to tell if that's happened, we have to clear
1515 the error buffer, and check if it's still a null string. */
1516 open_err_str[0] = '\0';
1517 ld.pch = pcap_open_live(capture_opts.iface, capture_opts.snaplen,
1518 capture_opts.promisc_mode, 1000, open_err_str);
1520 if (ld.pch != NULL) {
1521 /* setting the data link type only works on real interfaces */
1522 if (capture_opts.linktype != -1) {
1523 set_linktype_err_str = set_pcap_linktype(ld.pch, capture_opts.iface,
1524 capture_opts.linktype);
1525 if (set_linktype_err_str != NULL) {
1526 g_snprintf(errmsg, sizeof errmsg, "Unable to set data link type (%s).",
1527 set_linktype_err_str);
1532 /* We couldn't open "cfile.iface" as a network device. */
1534 /* On Windows, we don't support capturing on pipes, so we give up. */
1536 /* On Win32 OSes, the capture devices are probably available to all
1537 users; don't warn about permissions problems.
1539 Do, however, warn that WAN devices aren't supported. */
1540 g_snprintf(errmsg, sizeof errmsg,
1541 "The capture session could not be initiated (%s).\n"
1542 "Please check that you have the proper interface specified.\n"
1544 "Note that the WinPcap 2.x version of the driver Ethereal uses for packet\n"
1545 "capture on Windows doesn't support capturing on PPP/WAN interfaces in\n"
1546 "Windows NT/2000/XP/2003 Server, and that the WinPcap 3.0 and later versions\n"
1547 "don't support capturing on PPP/WAN interfaces at all.\n",
1551 /* try to open cfile.iface as a pipe */
1552 pipe_fd = pipe_open_live(capture_opts.iface, &hdr, &ld, errmsg,
1555 if (pipe_fd == -1) {
1557 if (ld.pipe_err == PIPNEXIST) {
1558 /* Pipe doesn't exist, so output message for interface */
1560 /* If we got a "can't find PPA for XXX" message, warn the user (who
1561 is running Tethereal on HP-UX) that they don't have a version
1562 of libpcap that properly handles HP-UX (libpcap 0.6.x and later
1563 versions, which properly handle HP-UX, say "can't find /dev/dlpi
1564 PPA for XXX" rather than "can't find PPA for XXX"). */
1565 if (strncmp(open_err_str, ppamsg, sizeof ppamsg - 1) == 0)
1568 "You are running Tethereal with a version of the libpcap library\n"
1569 "that doesn't handle HP-UX network devices well; this means that\n"
1570 "Tethereal may not be able to capture packets.\n"
1572 "To fix this, you should install libpcap 0.6.2, or a later version\n"
1573 "of libpcap, rather than libpcap 0.4 or 0.5.x. It is available in\n"
1574 "packaged binary form from the Software Porting And Archive Centre\n"
1575 "for HP-UX; the Centre is at http://hpux.connect.org.uk/ - the page\n"
1576 "at the URL lists a number of mirror sites.";
1579 g_snprintf(errmsg, sizeof errmsg,
1580 "The capture session could not be initiated (%s).\n"
1581 "Please check to make sure you have sufficient permissions, and that\n"
1582 "you have the proper interface or pipe specified.%s", open_err_str,
1586 * Else pipe (or file) does exist and pipe_open_live() has
1591 /* pipe_open_live() succeeded; don't want
1592 error message from pcap_open_live() */
1593 open_err_str[0] = '\0';
1599 * We've opened the capture device, so, if we're set-UID or set-GID,
1600 * relinquish those privileges.
1602 * XXX - if we have saved set-user-ID support, we should give up those
1603 * privileges immediately, and then reclaim them long enough to get
1604 * a list of network interfaces and to open one, and then give them
1605 * up again, so that stuff we do while processing the argument list,
1606 * reading the user's preferences, etc. is done as the real user and
1607 * group, not the effective user and group.
1613 if (capture_opts.cfilter && !ld.from_pipe) {
1614 /* A capture filter was specified; set it up. */
1615 if (pcap_lookupnet(capture_opts.iface, &netnum, &netmask, lookup_net_err_str) < 0) {
1617 * Well, we can't get the netmask for this interface; it's used
1618 * only for filters that check for broadcast IP addresses, so
1619 * we just warn the user, and punt and use 0.
1622 "Warning: Couldn't obtain netmask info (%s).\n", lookup_net_err_str);
1625 if (pcap_compile(ld.pch, &fcode, capture_opts.cfilter, 1, netmask) < 0) {
1626 if (dfilter_compile(capture_opts.cfilter, &rfcode)) {
1627 g_snprintf(errmsg, sizeof errmsg,
1628 "Unable to parse capture filter string (%s).\n"
1629 " Interestingly enough, this looks like a valid display filter\n"
1630 " Are you sure you didn't mix them up?",
1631 pcap_geterr(ld.pch));
1633 g_snprintf(errmsg, sizeof errmsg,
1634 "Unable to parse capture filter string (%s).",
1635 pcap_geterr(ld.pch));
1639 if (pcap_setfilter(ld.pch, &fcode) < 0) {
1640 g_snprintf(errmsg, sizeof errmsg, "Can't install filter (%s).",
1641 pcap_geterr(ld.pch));
1642 #ifdef HAVE_PCAP_FREECODE
1643 pcap_freecode(&fcode);
1647 #ifdef HAVE_PCAP_FREECODE
1648 pcap_freecode(&fcode);
1652 /* Set up to write to the capture file. */
1655 pcap_encap = hdr.network;
1656 file_snaplen = hdr.snaplen;
1660 pcap_encap = get_pcap_linktype(ld.pch, capture_opts.iface);
1661 file_snaplen = pcap_snapshot(ld.pch);
1663 ld.linktype = wtap_pcap_encap_to_wtap_encap(pcap_encap);
1664 if (save_file != NULL) {
1665 /* Set up to write to the capture file. */
1666 if (ld.linktype == WTAP_ENCAP_UNKNOWN) {
1667 strcpy(errmsg, "The network you're capturing from is of a type"
1668 " that Tethereal doesn't support.");
1671 ld.save_file = save_file;
1672 if (capture_opts.multi_files_on) {
1673 save_file_fd = ringbuf_init(save_file,
1674 capture_opts.ring_num_files);
1675 if (save_file_fd != -1) {
1676 ld.pdh = ringbuf_init_wtap_dump_fdopen(out_file_type, ld.linktype,
1677 file_snaplen, &err);
1679 err = errno; /* "ringbuf_init()" failed */
1683 ld.pdh = wtap_dump_open(save_file, out_file_type,
1684 ld.linktype, file_snaplen, &err);
1687 if (ld.pdh == NULL) {
1688 g_snprintf(errmsg, sizeof errmsg,
1689 cf_open_error_message(err, NULL, TRUE, out_file_type),
1690 *save_file == '\0' ? "stdout" : save_file);
1695 /* Does "open_err_str" contain a non-empty string? If so, "pcap_open_live()"
1696 returned a warning; print it, but keep capturing. */
1697 if (open_err_str[0] != '\0')
1698 fprintf(stderr, "tethereal: WARNING: %s.\n", open_err_str);
1701 /* Catch a CTRL+C event and, if we get it, clean up and exit. */
1702 SetConsoleCtrlHandler(capture_cleanup, TRUE);
1704 /* Catch SIGINT and SIGTERM and, if we get either of them, clean up
1706 XXX - deal with signal semantics on various UNIX platforms. Or just
1707 use "sigaction()" and be done with it? */
1708 signal(SIGTERM, capture_cleanup);
1709 signal(SIGINT, capture_cleanup);
1710 if ((oldhandler = signal(SIGHUP, capture_cleanup)) != SIG_DFL)
1711 signal(SIGHUP, oldhandler);
1714 /* Catch SIGINFO and, if we get it and we're capturing to a file in
1715 quiet mode, report the number of packets we've captured. */
1716 signal(SIGINFO, report_counts_siginfo);
1717 #endif /* SIGINFO */
1720 /* Let the user know what interface was chosen. */
1721 descr = get_interface_descriptive_name(capture_opts.iface);
1722 fprintf(stderr, "Capturing on %s\n", descr);
1725 /* initialize capture stop conditions */
1726 init_capture_stop_conditions();
1727 /* create stop conditions */
1728 if (capture_opts.has_autostop_filesize)
1729 cnd_stop_capturesize = cnd_new((const char*)CND_CLASS_CAPTURESIZE,
1730 (long)capture_opts.autostop_filesize * 1000);
1731 if (capture_opts.has_autostop_duration)
1732 cnd_stop_timeout = cnd_new((const char*)CND_CLASS_TIMEOUT,
1733 (gint32)capture_opts.autostop_duration);
1735 if (capture_opts.multi_files_on && capture_opts.has_file_duration)
1736 cnd_ring_timeout = cnd_new(CND_CLASS_TIMEOUT,
1737 capture_opts.file_duration);
1739 if (!setjmp(ld.stopenv)) {
1741 ld.packet_count = 0;
1745 /* We need to be careful with automatic variables defined in the
1746 outer scope which are changed inside the loop. Most compilers
1747 don't try to roll them back to their original values after the
1748 longjmp which causes the loop to finish, but all that the
1749 standards say is that their values are indeterminate. If we
1750 don't want them to be rolled back, we should define them with the
1751 volatile attribute (paraphrasing W. Richard Stevens, Advanced
1752 Programming in the UNIX Environment, p. 178).
1754 The "err" variable causes a particular problem. If we give it
1755 the volatile attribute, then when we pass a reference to it (as
1756 in "&err") to a function, GCC warns: "passing arg <n> of
1757 <function> discards qualifiers from pointer target type".
1758 Therefore within the loop and just beyond we don't use "err".
1759 Within the loop we define "loop_err", and assign its value to
1760 "volatile_err", which is in the outer scope and is checked when
1763 We also define "packet_count_prev" here to keep things tidy,
1764 since it's used only inside the loop. If it were defined in the
1765 outer scope, GCC would give a warning (unnecessary in this case)
1766 that it might be clobbered, and we'd need to give it the volatile
1767 attribute to suppress the warning. */
1770 int packet_count_prev = 0;
1772 if (cnd_stop_capturesize == NULL && cnd_stop_timeout == NULL) {
1773 /* We're not stopping at a particular capture file size, and we're
1774 not stopping after some particular amount of time has expired,
1775 so either we have no stop condition or the only stop condition
1776 is a maximum packet count.
1778 If there's no maximum packet count, pass it -1, meaning "until
1779 you run out of packets in the bufferful you read". Otherwise,
1780 pass it the number of packets we have left to capture.
1782 We don't call "pcap_loop()" as, if we're saving to a file that's
1783 a FIFO, we want to flush the FIFO after we're done processing
1784 this libpcap bufferful of packets, so that the program
1785 reading the FIFO sees the packets immediately and doesn't get
1786 any partial packet, forcing it to block in the middle of reading
1788 if (capture_opts.autostop_packets == 0)
1791 if (ld.packet_count >= capture_opts.autostop_packets) {
1792 /* XXX do we need this test here? */
1793 /* It appears there's nothing more to capture. */
1796 pcap_cnt = capture_opts.autostop_packets - ld.packet_count;
1799 /* We need to check the capture file size or the timeout after
1805 inpkts = pipe_dispatch(pipe_fd, &ld, &hdr, &rechdr, pcap_data,
1806 errmsg, sizeof errmsg);
1809 inpkts = pcap_dispatch(ld.pch, pcap_cnt, capture_pcap_cb, (guchar *) &ld);
1811 /* Error from "pcap_dispatch()", or error or "no more packets" from
1812 "pipe_dispatch(). */
1814 } else if (cnd_stop_timeout != NULL && cnd_eval(cnd_stop_timeout)) {
1815 /* The specified capture time has elapsed; stop the capture. */
1817 } else if (inpkts > 0) {
1818 if (capture_opts.autostop_packets != 0 &&
1819 ld.packet_count >= capture_opts.autostop_packets) {
1820 /* The specified number of packets have been captured and have
1821 passed both any capture filter in effect and any read filter
1824 } else if (cnd_stop_capturesize != NULL &&
1825 cnd_eval(cnd_stop_capturesize,
1826 (guint32)wtap_get_bytes_dumped(ld.pdh))) {
1827 /* We're saving the capture to a file, and the capture file reached
1828 its maximum size. */
1829 if (capture_opts.multi_files_on) {
1830 /* Switch to the next ringbuffer file */
1831 if (ringbuf_switch_file(&ld.pdh, &save_file, &save_file_fd, &loop_err)) {
1832 /* File switch succeeded: reset the condition */
1833 cnd_reset(cnd_stop_capturesize);
1834 if (cnd_ring_timeout) {
1835 cnd_reset(cnd_ring_timeout);
1838 /* File switch failed: stop here */
1839 volatile_err = loop_err;
1843 /* No ringbuffer - just stop. */
1847 if (ld.output_to_pipe) {
1848 if (ld.packet_count > packet_count_prev) {
1849 if (fflush(wtap_dump_file(ld.pdh))) {
1850 volatile_err = errno;
1853 packet_count_prev = ld.packet_count;
1857 } /* while (ld.go) */
1859 /* delete stop conditions */
1860 if (cnd_stop_capturesize != NULL)
1861 cnd_delete(cnd_stop_capturesize);
1862 if (cnd_stop_timeout != NULL)
1863 cnd_delete(cnd_stop_timeout);
1864 if (cnd_ring_timeout != NULL)
1865 cnd_delete(cnd_ring_timeout);
1867 if (print_packet_counts) {
1868 /* We're printing packet counts to stderr.
1869 Send a newline so that we move to the line after the packet count. */
1870 fprintf(stderr, "\n");
1873 /* If we got an error while capturing, report it. */
1877 if (ld.pipe_err == PIPERR) {
1878 fprintf(stderr, "tethereal: Error while capturing packets: %s\n",
1884 fprintf(stderr, "tethereal: Error while capturing packets: %s\n",
1885 pcap_geterr(ld.pch));
1889 if (volatile_err == 0)
1892 show_capture_file_io_error(save_file, volatile_err, FALSE);
1896 if (save_file != NULL) {
1897 /* We're saving to a file or files; close all files. */
1898 if (capture_opts.multi_files_on) {
1899 dump_ok = ringbuf_wtap_dump_close(&save_file, &err);
1901 dump_ok = wtap_dump_close(ld.pdh, &err);
1903 /* If we've displayed a message about a write error, there's no point
1904 in displaying another message about an error on close. */
1905 if (!dump_ok && !write_err)
1906 show_capture_file_io_error(save_file, err, TRUE);
1910 if (ld.from_pipe && pipe_fd >= 0)
1915 /* Get the capture statistics, and, if any packets were dropped, report
1917 if (pcap_stats(ld.pch, &stats) >= 0) {
1918 if (stats.ps_drop != 0) {
1919 fprintf(stderr, "%u packets dropped\n", stats.ps_drop);
1922 fprintf(stderr, "tethereal: Can't get packet-drop statistics: %s\n",
1923 pcap_geterr(ld.pch));
1928 /* Report the number of captured packets if not reported during capture
1929 and we are saving to a file. */
1935 if (capture_opts.multi_files_on) {
1936 ringbuf_error_cleanup();
1940 fprintf(stderr, "tethereal: %s\n", errmsg);
1956 capture_pcap_cb(guchar *user, const struct pcap_pkthdr *phdr,
1959 struct wtap_pkthdr whdr;
1960 union wtap_pseudo_header pseudo_header;
1961 loop_data *ldat = (loop_data *) user;
1966 /* Convert from libpcap to Wiretap format.
1967 If that fails, ignore the packet (wtap_process_pcap_packet has
1968 written an error message). */
1969 pd = wtap_process_pcap_packet(ldat->linktype, phdr, pd, &pseudo_header,
1976 * Prevent a SIGINFO handler from writing to stdout while we're
1977 * doing so; instead, have it just set a flag telling us to print
1978 * that information when we're done.
1981 #endif /* SIGINFO */
1983 /* The current packet may have arrived after a very long silence,
1984 * way past the time to switch files. In order not to have
1985 * the first packet of a new series of events as the last
1986 * [or only] packet in the file, switch before writing!
1988 if (cnd_ring_timeout != NULL && cnd_eval(cnd_ring_timeout)) {
1989 /* time elapsed for this ring file, switch to the next */
1990 if (ringbuf_switch_file(&ldat->pdh, &ldat->save_file, &save_file_fd, &loop_err)) {
1991 /* File switch succeeded: reset the condition */
1992 cnd_reset(cnd_ring_timeout);
1994 /* File switch failed: stop here */
1995 /* XXX - we should do something with "loop_err" */
2000 if (!process_packet(&cfile, ldat->pdh, 0, &whdr, &pseudo_header, pd, &err)) {
2001 /* Error writing to a capture file */
2002 if (print_packet_counts) {
2003 /* We're printing counts of packets captured; move to the line after
2005 fprintf(stderr, "\n");
2007 show_capture_file_io_error(ldat->save_file, err, FALSE);
2008 pcap_close(ldat->pch);
2009 wtap_dump_close(ldat->pdh, &err);
2015 * Allow SIGINFO handlers to write.
2020 * If a SIGINFO handler asked us to write out capture counts, do so.
2024 #endif /* SIGINFO */
2029 capture_cleanup(DWORD ctrltype _U_)
2031 /* CTRL_C_EVENT is sort of like SIGINT, CTRL_BREAK_EVENT is unique to
2032 Windows, CTRL_CLOSE_EVENT is sort of like SIGHUP, CTRL_LOGOFF_EVENT
2033 is also sort of like SIGHUP, and CTRL_SHUTDOWN_EVENT is sort of
2034 like SIGTERM at least when the machine's shutting down.
2036 For now, we handle them all as indications that we should clean up
2037 and quit, just as we handle SIGINT, SIGHUP, and SIGTERM in that
2040 However, as handlers run in a new thread, we can't just longjmp
2041 out; we have to set "ld.go" to FALSE, and must return TRUE so that
2042 no other handler - such as one that would terminate the process -
2045 XXX - for some reason, typing ^C to Tethereal, if you run this in
2046 a Cygwin console window in at least some versions of Cygwin,
2047 causes Tethereal to terminate immediately; this routine gets
2048 called, but the main loop doesn't get a chance to run and
2049 exit cleanly, at least if this is compiled with Microsoft Visual
2050 C++ (i.e., it's a property of the Cygwin console window or Bash;
2051 it happens if Tethereal is not built with Cygwin - for all I know,
2052 building it with Cygwin may make the problem go away). */
2058 capture_cleanup(int signum _U_)
2060 /* Longjmp back to the starting point; "pcap_dispatch()", on many
2061 UNIX platforms, just keeps looping if it gets EINTR, so if we set
2062 "ld.go" to FALSE and return, we won't break out of it and quit
2064 longjmp(ld.stopenv, 1);
2072 /* XXX - if we use sigaction, this doesn't have to be done.
2073 (Yes, this isn't necessary on BSD, but just in case a system
2074 where "signal()" has AT&T semantics adopts SIGINFO....) */
2075 signal(SIGINFO, report_counts_siginfo);
2076 #endif /* SIGINFO */
2078 if (!print_packet_counts) {
2079 /* Report the count only if we aren't printing a packet count
2080 as packets arrive. */
2081 fprintf(stderr, "%u packets captured\n", ld.packet_count);
2084 infoprint = FALSE; /* we just reported it */
2085 #endif /* SIGINFO */
2090 report_counts_siginfo(int signum _U_)
2092 int sav_errno = errno;
2093 /* If we've been told to delay printing, just set a flag asking
2094 that we print counts (if we're supposed to), otherwise print
2095 the count of packets captured (if we're supposed to). */
2102 #endif /* SIGINFO */
2103 #endif /* HAVE_LIBPCAP */
2106 load_cap_file(capture_file *cf, char *save_file, int out_file_type)
2109 int snapshot_length;
2115 linktype = wtap_file_encap(cf->wth);
2116 if (save_file != NULL) {
2117 /* Set up to write to the capture file. */
2118 snapshot_length = wtap_snapshot_length(cf->wth);
2119 if (snapshot_length == 0) {
2120 /* Snapshot length of input file not known. */
2121 snapshot_length = WTAP_MAX_PACKET_SIZE;
2123 pdh = wtap_dump_open(save_file, out_file_type,
2124 linktype, snapshot_length, &err);
2127 /* We couldn't set up to write to the capture file. */
2130 case WTAP_ERR_UNSUPPORTED_FILE_TYPE:
2132 "tethereal: Capture files can't be written in that format.\n");
2135 case WTAP_ERR_UNSUPPORTED_ENCAP:
2136 case WTAP_ERR_ENCAP_PER_PACKET_UNSUPPORTED:
2138 "tethereal: The capture file being read can't be written in "
2142 case WTAP_ERR_CANT_OPEN:
2144 "tethereal: The file \"%s\" couldn't be created for some "
2145 "unknown reason.\n",
2146 *save_file == '\0' ? "stdout" : save_file);
2149 case WTAP_ERR_SHORT_WRITE:
2151 "tethereal: A full header couldn't be written to the file \"%s\".\n",
2152 *save_file == '\0' ? "stdout" : save_file);
2157 "tethereal: The file \"%s\" could not be created: %s\n.",
2158 *save_file == '\0' ? "stdout" : save_file,
2159 wtap_strerror(err));
2165 if (print_packet_info) {
2166 if (!write_preamble(cf)) {
2168 show_print_file_io_error(err);
2174 while (wtap_read(cf->wth, &err, &err_info, &data_offset)) {
2175 if (!process_packet(cf, pdh, data_offset, wtap_phdr(cf->wth),
2176 wtap_pseudoheader(cf->wth), wtap_buf_ptr(cf->wth),
2178 /* Error writing to a capture file */
2179 show_capture_file_io_error(save_file, err, FALSE);
2180 wtap_dump_close(pdh, &err);
2185 /* Print a message noting that the read failed somewhere along the line. */
2188 case WTAP_ERR_UNSUPPORTED_ENCAP:
2190 "tethereal: \"%s\" has a packet with a network type that Tethereal doesn't support.\n(%s)\n",
2191 cf->filename, err_info);
2194 case WTAP_ERR_CANT_READ:
2196 "tethereal: An attempt to read from \"%s\" failed for some unknown reason.\n",
2200 case WTAP_ERR_SHORT_READ:
2202 "tethereal: \"%s\" appears to have been cut short in the middle of a packet.\n",
2206 case WTAP_ERR_BAD_RECORD:
2208 "tethereal: \"%s\" appears to be damaged or corrupt.\n(%s)\n",
2209 cf->filename, err_info);
2214 "tethereal: An error occurred while reading \"%s\": %s.\n",
2215 cf->filename, wtap_strerror(err));
2218 if (save_file != NULL) {
2219 /* Now close the capture file. */
2220 if (!wtap_dump_close(pdh, &err))
2221 show_capture_file_io_error(save_file, err, TRUE);
2224 if (save_file != NULL) {
2225 /* Now close the capture file. */
2226 if (!wtap_dump_close(pdh, &err))
2227 show_capture_file_io_error(save_file, err, TRUE);
2229 if (print_packet_info) {
2230 if (!write_finale()) {
2232 show_print_file_io_error(err);
2239 wtap_close(cf->wth);
2246 fill_in_fdata(frame_data *fdata, capture_file *cf,
2247 const struct wtap_pkthdr *phdr, long offset)
2252 fdata->num = cf->count;
2253 fdata->pkt_len = phdr->len;
2254 cum_bytes += phdr->len;
2255 fdata->cum_bytes = cum_bytes;
2256 fdata->cap_len = phdr->caplen;
2257 fdata->file_off = offset;
2258 fdata->lnk_t = phdr->pkt_encap;
2259 fdata->abs_ts = *((nstime_t *) &phdr->ts);
2260 fdata->flags.passed_dfilter = 0;
2261 fdata->flags.encoding = CHAR_ASCII;
2262 fdata->flags.visited = 0;
2263 fdata->flags.marked = 0;
2264 fdata->flags.ref_time = 0;
2266 /* If we don't have the time stamp of the first packet in the
2267 capture, it's because this is the first packet. Save the time
2268 stamp of this packet as the time stamp of the first packet. */
2269 if (nstime_is_zero(&first_ts)) {
2270 first_ts = fdata->abs_ts;
2273 /* If we don't have the time stamp of the previous displayed packet,
2274 it's because this is the first displayed packet. Save the time
2275 stamp of this packet as the time stamp of the previous displayed
2277 if (nstime_is_zero(&prev_ts)) {
2278 prev_ts = fdata->abs_ts;
2281 /* Get the time elapsed between the first packet and this packet. */
2282 nstime_delta(&fdata->rel_ts, &fdata->abs_ts, &first_ts);
2284 /* If it's greater than the current elapsed time, set the elapsed time
2285 to it (we check for "greater than" so as not to be confused by
2286 time moving backwards). */
2287 if ((gint32)cf->elapsed_time.secs < fdata->rel_ts.secs
2288 || ((gint32)cf->elapsed_time.secs == fdata->rel_ts.secs && (gint32)cf->elapsed_time.nsecs < fdata->rel_ts.nsecs)) {
2289 cf->elapsed_time = fdata->rel_ts;
2292 /* Get the time elapsed between the previous displayed packet and
2294 nstime_delta(&fdata->del_ts, &fdata->abs_ts, &prev_ts);
2295 prev_ts = fdata->abs_ts;
2298 /* Free up all data attached to a "frame_data" structure. */
2300 clear_fdata(frame_data *fdata)
2303 g_slist_free(fdata->pfd);
2307 process_packet(capture_file *cf, wtap_dumper *pdh, long offset,
2308 const struct wtap_pkthdr *whdr,
2309 union wtap_pseudo_header *pseudo_header, const guchar *pd,
2313 gboolean create_proto_tree;
2314 epan_dissect_t *edt;
2317 /* Count this packet. */
2320 /* If we're going to print packet information, or we're going to
2321 run a read filter, or we're going to process taps, set up to
2322 do a dissection and do so. */
2323 if (do_dissection) {
2324 fill_in_fdata(&fdata, cf, whdr, offset);
2326 if (print_packet_info) {
2327 /* Grab any resolved addresses */
2329 if (g_resolv_flags) {
2330 host_name_lookup_process(NULL);
2335 if (cf->rfcode || verbose || num_tap_filters!=0)
2336 create_proto_tree = TRUE;
2338 create_proto_tree = FALSE;
2339 /* The protocol tree will be "visible", i.e., printed, only if we're
2340 printing packet details, which is true if we're printing stuff
2341 ("print_packet_info" is true) and we're in verbose mode ("verbose"
2343 edt = epan_dissect_new(create_proto_tree, print_packet_info && verbose);
2345 /* If we're running a read filter, prime the epan_dissect_t with that
2348 epan_dissect_prime_dfilter(edt, cf->rfcode);
2350 tap_queue_init(edt);
2352 /* We only need the columns if we're printing packet info but we're
2353 *not* verbose; in verbose mode, we print the protocol tree, not
2354 the protocol summary. */
2355 epan_dissect_run(edt, pseudo_header, pd, &fdata,
2356 (print_packet_info && !verbose) ? &cf->cinfo : NULL);
2358 tap_push_tapped_queue(edt);
2360 /* Run the read filter if we have one. */
2362 passed = dfilter_apply_edt(cf->rfcode, edt);
2366 /* We're not running a display filter and we're not printing any
2367 packet information, so we don't need to do a dissection, and all
2368 packets are processed. */
2374 /* Count this packet. */
2379 /* Process this packet. */
2381 /* We're writing to a capture file; write this packet. */
2382 if (!wtap_dump(pdh, whdr, pseudo_header, pd, err))
2385 if (print_packet_counts) {
2386 /* We're printing packet counts. */
2387 if (ld.packet_count != 0) {
2388 fprintf(stderr, "\r%u ", ld.packet_count);
2389 /* stderr could be line buffered */
2395 if (print_packet_info) {
2396 /* We're printing packet information; print the information for
2398 print_packet(cf, edt);
2400 /* The ANSI C standard does not appear to *require* that a line-buffered
2401 stream be flushed to the host environment whenever a newline is
2402 written, it just says that, on such a stream, characters "are
2403 intended to be transmitted to or from the host environment as a
2404 block when a new-line character is encountered".
2406 The Visual C++ 6.0 C implementation doesn't do what is intended;
2407 even if you set a stream to be line-buffered, it still doesn't
2408 flush the buffer at the end of every line.
2410 So, if the "-l" flag was specified, we flush the standard output
2411 at the end of a packet. This will do the right thing if we're
2412 printing packet summary lines, and, as we print the entire protocol
2413 tree for a single packet without waiting for anything to happen,
2414 it should be as good as line-buffered mode if we're printing
2415 protocol trees. (The whole reason for the "-l" flag in either
2416 tcpdump or Tethereal is to allow the output of a live capture to
2417 be piped to a program or script and to have that script see the
2418 information for the packet as soon as it's printed, rather than
2419 having to wait until a standard I/O buffer fills up. */
2423 if (ferror(stdout)) {
2424 show_print_file_io_error(errno);
2430 if (do_dissection) {
2431 epan_dissect_free(edt);
2432 clear_fdata(&fdata);
2438 show_capture_file_io_error(const char *fname, int err, gboolean is_close)
2447 "tethereal: Not all the packets could be written to \"%s\" because there is "
2448 "no space left on the file system.\n",
2455 "tethereal: Not all the packets could be written to \"%s\" because you are "
2456 "too close to, or over your disk quota.\n",
2461 case WTAP_ERR_CANT_CLOSE:
2463 "tethereal: \"%s\" couldn't be closed for some unknown reason.\n",
2467 case WTAP_ERR_SHORT_WRITE:
2469 "tethereal: Not all the packets could be written to \"%s\".\n",
2476 "tethereal: \"%s\" could not be closed: %s.\n",
2477 fname, wtap_strerror(err));
2480 "tethereal: An error occurred while writing to \"%s\": %s.\n",
2481 fname, wtap_strerror(err));
2488 write_preamble(capture_file *cf)
2490 switch (output_action) {
2493 return print_preamble(print_stream, cf->filename);
2498 write_pdml_preamble(stdout);
2500 write_psml_preamble(stdout);
2501 return !ferror(stdout);
2504 g_assert_not_reached();
2510 get_line_buf(size_t len)
2512 static char *line_bufp = NULL;
2513 static size_t line_buf_len = 256;
2514 size_t new_line_buf_len;
2516 for (new_line_buf_len = line_buf_len; len > new_line_buf_len;
2517 new_line_buf_len *= 2)
2519 if (line_bufp == NULL) {
2520 line_buf_len = new_line_buf_len;
2521 line_bufp = g_malloc(line_buf_len + 1);
2523 if (new_line_buf_len > line_buf_len) {
2524 line_buf_len = new_line_buf_len;
2525 line_bufp = g_realloc(line_bufp, line_buf_len + 1);
2532 print_columns(capture_file *cf)
2539 line_bufp = get_line_buf(256);
2542 for (i = 0; i < cf->cinfo.num_cols; i++) {
2543 switch (cf->cinfo.col_fmt[i]) {
2547 * Don't print this if we're doing a live capture from a network
2548 * interface - if we're doing a live capture, you won't be
2549 * able to look at the capture in the future (it's not being
2550 * saved anywhere), so the frame numbers are unlikely to be
2553 * (XXX - it might be nice to be able to save and print at
2554 * the same time, sort of like an "Update list of packets
2555 * in real time" capture in Ethereal.)
2557 if (capture_opts.iface != NULL)
2560 column_len = strlen(cf->cinfo.col_data[i]);
2563 line_bufp = get_line_buf(buf_offset + column_len);
2564 sprintf(line_bufp + buf_offset, "%3s", cf->cinfo.col_data[i]);
2570 case COL_ABS_DATE_TIME: /* XXX - wider */
2571 column_len = strlen(cf->cinfo.col_data[i]);
2572 if (column_len < 10)
2574 line_bufp = get_line_buf(buf_offset + column_len);
2575 sprintf(line_bufp + buf_offset, "%10s", cf->cinfo.col_data[i]);
2581 case COL_DEF_DL_SRC:
2582 case COL_RES_DL_SRC:
2583 case COL_UNRES_DL_SRC:
2584 case COL_DEF_NET_SRC:
2585 case COL_RES_NET_SRC:
2586 case COL_UNRES_NET_SRC:
2587 column_len = strlen(cf->cinfo.col_data[i]);
2588 if (column_len < 12)
2590 line_bufp = get_line_buf(buf_offset + column_len);
2591 sprintf(line_bufp + buf_offset, "%12s", cf->cinfo.col_data[i]);
2597 case COL_DEF_DL_DST:
2598 case COL_RES_DL_DST:
2599 case COL_UNRES_DL_DST:
2600 case COL_DEF_NET_DST:
2601 case COL_RES_NET_DST:
2602 case COL_UNRES_NET_DST:
2603 column_len = strlen(cf->cinfo.col_data[i]);
2604 if (column_len < 12)
2606 line_bufp = get_line_buf(buf_offset + column_len);
2607 sprintf(line_bufp + buf_offset, "%-12s", cf->cinfo.col_data[i]);
2611 column_len = strlen(cf->cinfo.col_data[i]);
2612 line_bufp = get_line_buf(buf_offset + column_len);
2613 strcat(line_bufp + buf_offset, cf->cinfo.col_data[i]);
2616 buf_offset += column_len;
2617 if (i != cf->cinfo.num_cols - 1) {
2619 * This isn't the last column, so we need to print a
2620 * separator between this column and the next.
2622 * If we printed a network source and are printing a
2623 * network destination of the same type next, separate
2624 * them with "->"; if we printed a network destination
2625 * and are printing a network source of the same type
2626 * next, separate them with "<-"; otherwise separate them
2629 * We add enough space to the buffer for " <- " or " -> ",
2630 * even if we're only adding " ".
2632 line_bufp = get_line_buf(buf_offset + 4);
2633 switch (cf->cinfo.col_fmt[i]) {
2638 switch (cf->cinfo.col_fmt[i + 1]) {
2643 strcat(line_bufp + buf_offset, " -> ");
2648 strcat(line_bufp + buf_offset, " ");
2654 case COL_DEF_DL_SRC:
2655 case COL_RES_DL_SRC:
2656 case COL_UNRES_DL_SRC:
2657 switch (cf->cinfo.col_fmt[i + 1]) {
2659 case COL_DEF_DL_DST:
2660 case COL_RES_DL_DST:
2661 case COL_UNRES_DL_DST:
2662 strcat(line_bufp + buf_offset, " -> ");
2667 strcat(line_bufp + buf_offset, " ");
2673 case COL_DEF_NET_SRC:
2674 case COL_RES_NET_SRC:
2675 case COL_UNRES_NET_SRC:
2676 switch (cf->cinfo.col_fmt[i + 1]) {
2678 case COL_DEF_NET_DST:
2679 case COL_RES_NET_DST:
2680 case COL_UNRES_NET_DST:
2681 strcat(line_bufp + buf_offset, " -> ");
2686 strcat(line_bufp + buf_offset, " ");
2695 switch (cf->cinfo.col_fmt[i + 1]) {
2700 strcat(line_bufp + buf_offset, " <- ");
2705 strcat(line_bufp + buf_offset, " ");
2711 case COL_DEF_DL_DST:
2712 case COL_RES_DL_DST:
2713 case COL_UNRES_DL_DST:
2714 switch (cf->cinfo.col_fmt[i + 1]) {
2716 case COL_DEF_DL_SRC:
2717 case COL_RES_DL_SRC:
2718 case COL_UNRES_DL_SRC:
2719 strcat(line_bufp + buf_offset, " <- ");
2724 strcat(line_bufp + buf_offset, " ");
2730 case COL_DEF_NET_DST:
2731 case COL_RES_NET_DST:
2732 case COL_UNRES_NET_DST:
2733 switch (cf->cinfo.col_fmt[i + 1]) {
2735 case COL_DEF_NET_SRC:
2736 case COL_RES_NET_SRC:
2737 case COL_UNRES_NET_SRC:
2738 strcat(line_bufp + buf_offset, " <- ");
2743 strcat(line_bufp + buf_offset, " ");
2750 strcat(line_bufp + buf_offset, " ");
2756 return print_line(print_stream, 0, line_bufp);
2760 print_packet(capture_file *cf, epan_dissect_t *edt)
2762 print_args_t print_args;
2765 /* Print the information in the protocol tree. */
2766 switch (output_action) {
2769 print_args.to_file = TRUE;
2770 print_args.format = print_format;
2771 print_args.print_summary = !verbose;
2772 print_args.print_hex = verbose && print_hex;
2773 print_args.print_formfeed = FALSE;
2774 print_args.print_dissections = verbose ? print_dissections_expanded : print_dissections_none;
2776 /* init the packet range */
2777 packet_range_init(&print_args.range);
2779 if (!proto_tree_print(&print_args, edt, print_stream))
2782 /* "print_hex_data()" will put out a leading blank line, as well
2783 as a trailing one; print one here, to separate the packets,
2784 only if "print_hex_data()" won't be called. */
2785 if (!print_line(print_stream, 0, ""))
2791 proto_tree_write_pdml(edt, stdout);
2793 return !ferror(stdout);
2796 /* Just fill in the columns. */
2797 epan_dissect_fill_in_columns(edt);
2799 /* Now print them. */
2800 switch (output_action) {
2803 if (!print_columns(cf))
2808 proto_tree_write_psml(edt, stdout);
2809 return !ferror(stdout);
2813 if (!print_hex_data(print_stream, edt))
2815 if (!print_line(print_stream, 0, ""))
2824 switch (output_action) {
2827 return print_finale(print_stream);
2832 write_pdml_finale(stdout);
2834 write_psml_finale(stdout);
2835 return !ferror(stdout);
2838 g_assert_not_reached();
2844 show_print_file_io_error(int err)
2850 "tethereal: Not all the packets could be printed because there is "
2851 "no space left on the file system.\n");
2857 "tethereal: Not all the packets could be printed because you are "
2858 "too close to, or over your disk quota.\n");
2864 "tethereal: An error occurred while printing packets: %s.\n",
2871 cf_open_error_message(int err, gchar *err_info, gboolean for_writing,
2875 static char errmsg_errno[1024+1];
2878 /* Wiretap error. */
2881 case WTAP_ERR_NOT_REGULAR_FILE:
2882 errmsg = "The file \"%s\" is a \"special file\" or socket or other non-regular file.";
2885 case WTAP_ERR_FILE_UNKNOWN_FORMAT:
2886 /* Seen only when opening a capture file for reading. */
2887 errmsg = "The file \"%s\" isn't a capture file in a format Tethereal understands.";
2890 case WTAP_ERR_UNSUPPORTED:
2891 /* Seen only when opening a capture file for reading. */
2892 g_snprintf(errmsg_errno, sizeof(errmsg_errno),
2893 "The file \"%%s\" isn't a capture file in a format Tethereal understands.\n"
2896 errmsg = errmsg_errno;
2899 case WTAP_ERR_CANT_WRITE_TO_PIPE:
2900 /* Seen only when opening a capture file for writing. */
2901 g_snprintf(errmsg_errno, sizeof(errmsg_errno),
2902 "The file \"%%s\" is a pipe, and %s capture files can't be "
2903 "written to a pipe.", wtap_file_type_string(file_type));
2904 errmsg = errmsg_errno;
2907 case WTAP_ERR_UNSUPPORTED_FILE_TYPE:
2908 /* Seen only when opening a capture file for writing. */
2909 errmsg = "Tethereal doesn't support writing capture files in that format.";
2912 case WTAP_ERR_UNSUPPORTED_ENCAP:
2914 errmsg = "Tethereal can't save this capture in that format.";
2916 g_snprintf(errmsg_errno, sizeof(errmsg_errno),
2917 "The file \"%%s\" is a capture for a network type that Tethereal doesn't support.\n"
2920 errmsg = errmsg_errno;
2924 case WTAP_ERR_ENCAP_PER_PACKET_UNSUPPORTED:
2926 errmsg = "Tethereal can't save this capture in that format.";
2928 errmsg = "The file \"%s\" is a capture for a network type that Tethereal doesn't support.";
2931 case WTAP_ERR_BAD_RECORD:
2932 /* Seen only when opening a capture file for reading. */
2933 g_snprintf(errmsg_errno, sizeof(errmsg_errno),
2934 "The file \"%%s\" appears to be damaged or corrupt.\n"
2937 errmsg = errmsg_errno;
2940 case WTAP_ERR_CANT_OPEN:
2942 errmsg = "The file \"%s\" could not be created for some unknown reason.";
2944 errmsg = "The file \"%s\" could not be opened for some unknown reason.";
2947 case WTAP_ERR_SHORT_READ:
2948 errmsg = "The file \"%s\" appears to have been cut short"
2949 " in the middle of a packet or other data.";
2952 case WTAP_ERR_SHORT_WRITE:
2953 errmsg = "A full header couldn't be written to the file \"%s\".";
2957 g_snprintf(errmsg_errno, sizeof(errmsg_errno),
2958 "The file \"%%s\" could not be %s: %s.",
2959 for_writing ? "created" : "opened",
2960 wtap_strerror(err));
2961 errmsg = errmsg_errno;
2965 errmsg = file_open_error_message(err, for_writing);
2970 * Open/create errors are reported with an console message in Tethereal.
2973 open_failure_message(const char *filename, int err, gboolean for_writing)
2975 fprintf(stderr, "tethereal: ");
2976 fprintf(stderr, file_open_error_message(err, for_writing), filename);
2977 fprintf(stderr, "\n");
2981 cf_open(capture_file *cf, const char *fname, gboolean is_tempfile, int *err)
2985 char err_msg[2048+1];
2987 wth = wtap_open_offline(fname, err, &err_info, FALSE);
2991 /* The open succeeded. Fill in the information for this file. */
2993 /* Initialize all data structures used for dissection. */
2997 cf->f_datalen = 0; /* not used, but set it anyway */
2999 /* Set the file name because we need it to set the follow stream filter.
3000 XXX - is that still true? We need it for other reasons, though,
3002 cf->filename = g_strdup(fname);
3004 /* Indicate whether it's a permanent or temporary file. */
3005 cf->is_tempfile = is_tempfile;
3007 /* If it's a temporary capture buffer file, mark it as not saved. */
3008 cf->user_saved = !is_tempfile;
3010 cf->cd_t = wtap_file_type(cf->wth);
3012 cf->drops_known = FALSE;
3014 cf->snap = wtap_snapshot_length(cf->wth);
3015 if (cf->snap == 0) {
3016 /* Snapshot length not known. */
3017 cf->has_snap = FALSE;
3018 cf->snap = WTAP_MAX_PACKET_SIZE;
3020 cf->has_snap = TRUE;
3021 nstime_set_zero(&cf->elapsed_time);
3022 nstime_set_zero(&first_ts);
3023 nstime_set_zero(&prev_ts);
3028 g_snprintf(err_msg, sizeof err_msg,
3029 cf_open_error_message(*err, err_info, FALSE, 0), fname);
3030 fprintf(stderr, "tethereal: %s\n", err_msg);
3036 /* Take care of byte order in the libpcap headers read from pipes.
3037 * (function taken from wiretap/libpcap.c) */
3039 adjust_header(loop_data *ldat, struct pcap_hdr *hdr, struct pcaprec_hdr *rechdr)
3041 if (ldat->byte_swapped) {
3042 /* Byte-swap the record header fields. */
3043 rechdr->ts_sec = BSWAP32(rechdr->ts_sec);
3044 rechdr->ts_usec = BSWAP32(rechdr->ts_usec);
3045 rechdr->incl_len = BSWAP32(rechdr->incl_len);
3046 rechdr->orig_len = BSWAP32(rechdr->orig_len);
3049 /* In file format version 2.3, the "incl_len" and "orig_len" fields were
3050 swapped, in order to match the BPF header layout.
3052 Unfortunately, some files were, according to a comment in the "libpcap"
3053 source, written with version 2.3 in their headers but without the
3054 interchanged fields, so if "incl_len" is greater than "orig_len" - which
3055 would make no sense - we assume that we need to swap them. */
3056 if (hdr->version_major == 2 &&
3057 (hdr->version_minor < 3 ||
3058 (hdr->version_minor == 3 && rechdr->incl_len > rechdr->orig_len))) {
3061 temp = rechdr->orig_len;
3062 rechdr->orig_len = rechdr->incl_len;
3063 rechdr->incl_len = temp;
3067 /* Mimic pcap_open_live() for pipe captures
3068 * We check if "pipename" is "-" (stdin) or a FIFO, open it, and read the
3070 * N.B. : we can't read the libpcap formats used in RedHat 6.1 or SuSE 6.3
3071 * because we can't seek on pipes (see wiretap/libpcap.c for details) */
3073 pipe_open_live(char *pipename, struct pcap_hdr *hdr, loop_data *ldat,
3074 char *errmsg, int errmsgl)
3076 struct stat pipe_stat;
3080 unsigned int bytes_read;
3083 * XXX Tethereal blocks until we return
3085 if (strcmp(pipename, "-") == 0)
3086 fd = 0; /* read from stdin */
3088 if (stat(pipename, &pipe_stat) < 0) {
3089 if (errno == ENOENT || errno == ENOTDIR)
3090 ldat->pipe_err = PIPNEXIST;
3092 g_snprintf(errmsg, errmsgl,
3093 "The capture session could not be initiated "
3094 "due to error on pipe: %s", strerror(errno));
3095 ldat->pipe_err = PIPERR;
3099 if (! S_ISFIFO(pipe_stat.st_mode)) {
3100 if (S_ISCHR(pipe_stat.st_mode)) {
3102 * Assume the user specified an interface on a system where
3103 * interfaces are in /dev. Pretend we haven't seen it.
3105 ldat->pipe_err = PIPNEXIST;
3107 g_snprintf(errmsg, errmsgl,
3108 "The capture session could not be initiated because\n"
3109 "\"%s\" is neither an interface nor a pipe", pipename);
3110 ldat->pipe_err = PIPERR;
3114 fd = open(pipename, O_RDONLY);
3116 g_snprintf(errmsg, errmsgl,
3117 "The capture session could not be initiated "
3118 "due to error on pipe open: %s", strerror(errno));
3119 ldat->pipe_err = PIPERR;
3124 ldat->from_pipe = TRUE;
3126 /* read the pcap header */
3128 while (bytes_read < sizeof magic) {
3129 b = read(fd, ((char *)&magic)+bytes_read, sizeof magic-bytes_read);
3132 g_snprintf(errmsg, errmsgl, "End of file on pipe during open");
3134 g_snprintf(errmsg, errmsgl, "Error on pipe during open: %s",
3143 /* Host that wrote it has our byte order, and was running
3144 a program using either standard or ss990417 libpcap. */
3145 ldat->byte_swapped = FALSE;
3146 ldat->modified = FALSE;
3148 case PCAP_MODIFIED_MAGIC:
3149 /* Host that wrote it has our byte order, but was running
3150 a program using either ss990915 or ss991029 libpcap. */
3151 ldat->byte_swapped = FALSE;
3152 ldat->modified = TRUE;
3154 case PCAP_SWAPPED_MAGIC:
3155 /* Host that wrote it has a byte order opposite to ours,
3156 and was running a program using either standard or
3157 ss990417 libpcap. */
3158 ldat->byte_swapped = TRUE;
3159 ldat->modified = FALSE;
3161 case PCAP_SWAPPED_MODIFIED_MAGIC:
3162 /* Host that wrote it out has a byte order opposite to
3163 ours, and was running a program using either ss990915
3164 or ss991029 libpcap. */
3165 ldat->byte_swapped = TRUE;
3166 ldat->modified = TRUE;
3169 /* Not a "libpcap" type we know about. */
3170 g_snprintf(errmsg, errmsgl, "Unrecognized libpcap format");
3174 /* Read the rest of the header */
3176 while (bytes_read < sizeof(struct pcap_hdr)) {
3177 b = read(fd, ((char *)hdr)+bytes_read,
3178 sizeof(struct pcap_hdr) - bytes_read);
3181 g_snprintf(errmsg, errmsgl, "End of file on pipe during open");
3183 g_snprintf(errmsg, errmsgl, "Error on pipe during open: %s",
3190 if (ldat->byte_swapped) {
3191 /* Byte-swap the header fields about which we care. */
3192 hdr->version_major = BSWAP16(hdr->version_major);
3193 hdr->version_minor = BSWAP16(hdr->version_minor);
3194 hdr->snaplen = BSWAP32(hdr->snaplen);
3195 hdr->network = BSWAP32(hdr->network);
3198 if (hdr->version_major < 2) {
3199 g_snprintf(errmsg, errmsgl, "Unable to read old libpcap format");
3203 ldat->pipe_state = STATE_EXPECT_REC_HDR;
3204 ldat->pipe_err = PIPOK;
3208 ldat->pipe_err = PIPERR;
3213 /* We read one record from the pipe, take care of byte order in the record
3214 * header, write the record in the capture file, and update capture statistics. */
3217 pipe_dispatch(int fd, loop_data *ldat, struct pcap_hdr *hdr,
3218 struct pcaprec_modified_hdr *rechdr, guchar *data,
3219 char *errmsg, int errmsgl)
3221 struct pcap_pkthdr phdr;
3223 enum { PD_REC_HDR_READ, PD_DATA_READ, PD_PIPE_EOF, PD_PIPE_ERR,
3226 switch (ldat->pipe_state) {
3228 case STATE_EXPECT_REC_HDR:
3229 ldat->bytes_to_read = ldat->modified ?
3230 sizeof(struct pcaprec_modified_hdr) : sizeof(struct pcaprec_hdr);
3231 ldat->bytes_read = 0;
3232 ldat->pipe_state = STATE_READ_REC_HDR;
3235 case STATE_READ_REC_HDR:
3236 b = read(fd, ((char *)rechdr)+ldat->bytes_read,
3237 ldat->bytes_to_read - ldat->bytes_read);
3240 result = PD_PIPE_EOF;
3242 result = PD_PIPE_ERR;
3245 if ((ldat->bytes_read += b) < ldat->bytes_to_read)
3247 result = PD_REC_HDR_READ;
3250 case STATE_EXPECT_DATA:
3251 ldat->bytes_read = 0;
3252 ldat->pipe_state = STATE_READ_DATA;
3255 case STATE_READ_DATA:
3256 b = read(fd, data+ldat->bytes_read, rechdr->hdr.incl_len - ldat->bytes_read);
3259 result = PD_PIPE_EOF;
3261 result = PD_PIPE_ERR;
3264 if ((ldat->bytes_read += b) < rechdr->hdr.incl_len)
3266 result = PD_DATA_READ;
3270 g_snprintf(errmsg, errmsgl, "pipe_dispatch: invalid state");
3273 } /* switch (ldat->pipe_state) */
3276 * We've now read as much data as we were expecting, so process it.
3280 case PD_REC_HDR_READ:
3281 /* We've read the header. Take care of byte order. */
3282 adjust_header(ldat, hdr, &rechdr->hdr);
3283 if (rechdr->hdr.incl_len > WTAP_MAX_PACKET_SIZE) {
3284 g_snprintf(errmsg, errmsgl, "Frame %u too long (%d bytes)",
3285 ldat->packet_count+1, rechdr->hdr.incl_len);
3288 ldat->pipe_state = STATE_EXPECT_DATA;
3292 /* Fill in a "struct pcap_pkthdr", and process the packet. */
3293 phdr.ts.tv_sec = rechdr->hdr.ts_sec;
3294 phdr.ts.tv_usec = rechdr->hdr.ts_usec;
3295 phdr.caplen = rechdr->hdr.incl_len;
3296 phdr.len = rechdr->hdr.orig_len;
3298 capture_pcap_cb((guchar *)ldat, &phdr, data);
3300 ldat->pipe_state = STATE_EXPECT_REC_HDR;
3304 ldat->pipe_err = PIPEOF;
3308 g_snprintf(errmsg, errmsgl, "Error reading from pipe: %s",
3315 ldat->pipe_err = PIPERR;
3316 /* Return here rather than inside the switch to prevent GCC warning */
3320 #endif /* HAVE_LIBPCAP */
3323 * General errors are reported with an console message in Tethereal.
3326 failure_message(const char *msg_format, va_list ap)
3328 fprintf(stderr, "tethereal: ");
3329 vfprintf(stderr, msg_format, ap);
3330 fprintf(stderr, "\n");
3334 * Read errors are reported with an console message in Tethereal.
3337 read_failure_message(const char *filename, int err)
3339 fprintf(stderr, "tethereal: An error occurred while reading from the file \"%s\": %s.\n",
3340 filename, strerror(err));