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>
65 #include <epan/privileges.h>
66 #include <wiretap/file_util.h>
69 #include <epan/timestamp.h>
70 #include <epan/packet.h>
72 #include "disabled_protos.h"
73 #include <epan/prefs.h>
74 #include <epan/column.h>
76 #include <epan/addr_resolv.h>
78 #include "clopts_common.h"
79 #include "cmdarg_err.h"
80 #include "version_info.h"
81 #include <epan/conversation.h>
82 #include <epan/plugins.h>
84 #include "conditions.h"
85 #include "capture_stop_conditions.h"
86 #include "ringbuffer.h"
87 #include "capture_ui_utils.h"
88 #include <epan/epan_dissect.h>
90 #include <epan/stat_cmd_args.h>
91 #include <epan/timestamp.h>
92 #include <epan/ex-opt.h>
97 #include "capture-pcap-util.h"
99 #include <wiretap/wtap-capture.h>
101 #include "capture-wpcap.h"
102 #include "capture_errs.h"
105 #include "capture_loop.h"
106 #include "capture_sync.h"
107 #endif /* HAVE_LIBPCAP */
108 #include "epan/emem.h"
110 #include <epan/funnel.h>
113 * This is the template for the decode as option; it is shared between the
114 * various functions that output the usage for this parameter.
116 static const gchar decode_as_arg_template[] = "<layer_type>==<selector>,<decode_as_protocol>";
118 static nstime_t first_ts;
119 static nstime_t prev_ts;
120 static GString *comp_info_str, *runtime_info_str;
122 static gboolean print_packet_info; /* TRUE if we're to print packet information */
124 * The way the packet decode is to be written.
127 WRITE_TEXT, /* summary or detail text */
128 WRITE_XML /* PDML or PSML */
129 /* Add CSV and the like here */
131 static output_action_e output_action;
132 static gboolean do_dissection; /* TRUE if we have to dissect each packet */
133 static gboolean verbose;
134 static gboolean print_hex;
135 static gboolean line_buffered;
136 static guint32 cum_bytes = 0;
137 static print_format_e print_format = PR_FMT_TEXT;
138 static print_stream_t *print_stream;
141 * Standard secondary message for unexpected errors.
143 static const char please_report[] =
144 "Please report this to the Ethereal developers";
148 * TRUE if we're to print packet counts to keep track of captured packets.
150 static gboolean print_packet_counts;
156 static capture_options capture_opts;
160 static gboolean infodelay; /* if TRUE, don't print capture info in SIGINFO handler */
161 static gboolean infoprint; /* if TRUE, print capture info after clearing infodelay */
163 #endif /* HAVE_LIBPCAP */
166 static int capture(void);
167 static void capture_pcap_cb(u_char *, const struct pcap_pkthdr *,
169 static void report_counts(void);
171 static BOOL WINAPI capture_cleanup(DWORD);
173 static void capture_cleanup(int);
175 static void report_counts_siginfo(int);
178 #endif /* HAVE_LIBPCAP */
180 static int load_cap_file(capture_file *, char *, int);
181 static gboolean process_packet(capture_file *cf, long offset,
182 const struct wtap_pkthdr *whdr, union wtap_pseudo_header *pseudo_header,
184 static void show_capture_file_io_error(const char *, int, gboolean);
185 static void show_print_file_io_error(int err);
186 static gboolean write_preamble(capture_file *cf);
187 static gboolean print_packet(capture_file *cf, epan_dissect_t *edt);
188 static gboolean write_finale(void);
189 static const char *cf_open_error_message(int err, gchar *err_info,
190 gboolean for_writing, int file_type);
192 static void open_failure_message(const char *filename, int err,
193 gboolean for_writing);
194 static void failure_message(const char *msg_format, va_list ap);
195 static void read_failure_message(const char *filename, int err);
200 static void list_capture_types(void) {
203 fprintf(stderr, "editcap: The available capture file types for \"F\":\n");
204 for (i = 0; i < WTAP_NUM_FILE_TYPES; i++) {
205 if (wtap_dump_can_open(i))
206 fprintf(stderr, " %s - %s\n",
207 wtap_file_type_short_string(i), wtap_file_type_string(i));
212 print_usage(gboolean print_ver)
219 "Tethereal " VERSION "%s\n"
220 "Dump and analyze network traffic.\n"
221 "See http://www.ethereal.com for more information.\n"
224 svnversion, get_copyright_info());
228 fprintf(output, "\n");
229 fprintf(output, "Usage: tethereal [options] ...\n");
230 fprintf(output, "\n");
233 fprintf(output, "Capture interface:\n");
234 fprintf(output, " -i <interface> name or idx of interface (def: first none loopback)\n");
235 fprintf(output, " -f <capture filter> packet filter in libpcap filter syntax\n");
236 fprintf(output, " -s <snaplen> packet snapshot length (def: 65535)\n");
237 fprintf(output, " -p don't capture in promiscuous mode\n");
239 fprintf(output, " -B <buffer size> size of kernel buffer (def: 1MB)\n");
241 fprintf(output, " -y <link type> link layer type (def: first appropriate)\n");
242 fprintf(output, " -D print list of interfaces and exit\n");
243 fprintf(output, " -L print list of link-layer types of iface and exit\n");
244 fprintf(output, "\n");
245 fprintf(output, "Capture stop conditions:\n");
246 fprintf(output, " -c <packet count> stop after n packets (def: infinite)\n");
247 fprintf(output, " -a <autostop cond.> ... duration:NUM - stop after NUM seconds\n");
248 fprintf(output, " filesize:NUM - stop this file after NUM KB\n");
249 fprintf(output, " files:NUM - stop after NUM files\n");
250 /*fprintf(output, "\n");*/
251 fprintf(output, "Capture output:\n");
252 fprintf(output, " -b <ringbuffer opt.> ... duration:NUM - switch to next file after NUM secs\n");
253 fprintf(output, " filesize:NUM - switch to next file after NUM KB\n");
254 fprintf(output, " files:NUM - ringbuffer: replace after NUM files\n");
255 #endif /* HAVE_LIBPCAP */
257 /*fprintf(output, "\n");*/
258 fprintf(output, "Input file:\n");
259 fprintf(output, " -r <infile> set the filename to read from (no pipes or stdin!)\n");
261 fprintf(output, "\n");
262 fprintf(output, "Processing:\n");
263 fprintf(output, " -R <read filter> packet filter in Ethereal display filter syntax\n");
264 fprintf(output, " -n disable all name resolutions (def: all enabled)\n");
265 fprintf(output, " -N <name resolve flags> enable specific name resolution(s): \"mntC\"\n");
266 fprintf(output, " -d %s ...\n", decode_as_arg_template);
267 fprintf(output, " \"Decode As\", see the man page for details\n");
268 fprintf(output, " Example: tcp.port==8888,http\n");
270 /*fprintf(output, "\n");*/
271 fprintf(output, "Output:\n");
272 fprintf(stderr, " -w <outfile|-> set the output filename (or '-' for stdout)\n");
273 fprintf(stderr, " -F <output file type> set the output file type, default is libpcap\n");
274 fprintf(stderr, " an empty \"-F\" option will list the file types\n");
275 fprintf(output, " -V add output of packet tree (Packet Details)\n");
276 fprintf(output, " -x add output of hex and ASCII dump (Packet Bytes)\n");
277 fprintf(output, " -T pdml|ps|psml|text output format of text output (def: text)\n");
278 fprintf(output, " -t ad|a|r|d output format of time stamps (def: r: rel. to first)\n");
279 fprintf(output, " -l flush output after each packet\n");
280 fprintf(output, " -q be more quiet on stdout (e.g. when using statistics)\n");
281 fprintf(output, " -X <key>:<value> eXtension options, see the man page for details\n");
282 fprintf(output, " -z <statistics> various statistics, see the man page for details\n");
284 fprintf(output, "\n");
285 fprintf(stderr, "Miscellaneous:\n");
286 fprintf(stderr, " -h display this help and exit\n");
287 fprintf(stderr, " -v display version info and exit\n");
288 fprintf(output, " -o <name>:<value> ... override preference setting\n");
292 * For a dissector table, print on the stream described by output,
293 * its short name (which is what's used in the "-d" option) and its
297 display_dissector_table_names(char *table_name, const char *ui_name,
300 fprintf((FILE *)output, "\t%s (%s)\n", table_name, ui_name);
304 * For a dissector handle, print on the stream described by output,
305 * the filter name (which is what's used in the "-d" option) and the full
306 * name for the protocol that corresponds to this handle.
309 display_dissector_names(const gchar *table _U_, gpointer handle, gpointer output)
312 const gchar* proto_filter_name;
313 const gchar* proto_ui_name;
315 proto_id = dissector_handle_get_protocol_index((dissector_handle_t)handle);
317 if (proto_id != -1) {
318 proto_filter_name = proto_get_protocol_filter_name(proto_id);
319 proto_ui_name = proto_get_protocol_name(proto_id);
320 g_assert(proto_filter_name != NULL);
321 g_assert(proto_ui_name != NULL);
323 fprintf((FILE *)output, "\t%s (%s)\n",
330 * The protocol_name_search structure is used by find_protocol_name_func()
331 * to pass parameters and store results
333 struct protocol_name_search{
334 gchar *searched_name; /* Protocol filter name we are looking for */
335 dissector_handle_t matched_handle; /* Handle for a dissector whose protocol has the specified filter name */
336 guint nb_match; /* How many dissectors matched searched_name */
338 typedef struct protocol_name_search *protocol_name_search_t;
341 * This function parses all dissectors associated with a table to find the
342 * one whose protocol has the specified filter name. It is called
343 * as a reference function in a call to dissector_table_foreach_handle.
344 * The name we are looking for, as well as the results, are stored in the
345 * protocol_name_search struct pointed to by user_data.
346 * If called using dissector_table_foreach_handle, we actually parse the
347 * whole list of dissectors.
350 find_protocol_name_func(const gchar *table _U_, gpointer handle, gpointer user_data)
354 const gchar *protocol_filter_name;
355 protocol_name_search_t search_info;
359 search_info = (protocol_name_search_t)user_data;
361 proto_id = dissector_handle_get_protocol_index((dissector_handle_t)handle);
362 if (proto_id != -1) {
363 protocol_filter_name = proto_get_protocol_filter_name(proto_id);
364 g_assert(protocol_filter_name != NULL);
365 if (strcmp(protocol_filter_name, search_info->searched_name) == 0) {
367 if (search_info->nb_match == 0) {
368 /* Record this handle only if this is the first match */
369 search_info->matched_handle = (dissector_handle_t)handle; /* Record the handle for this matching dissector */
371 search_info->nb_match++;
377 * Print all layer type names supported.
378 * We send the output to the stream described by the handle output.
382 fprint_all_layer_types(FILE *output)
385 dissector_all_tables_foreach_table(display_dissector_table_names, (gpointer)output);
389 * Print all protocol names supported for a specific layer type.
390 * table_name contains the layer type name in which the search is performed.
391 * We send the output to the stream described by the handle output.
395 fprint_all_protocols_for_layer_types(FILE *output, gchar *table_name)
398 dissector_table_foreach_handle(table_name,
399 display_dissector_names,
404 * The function below parses the command-line parameters for the decode as
405 * feature (a string pointer by cl_param).
406 * It checks the format of the command-line, searches for a matching table
407 * and dissector. If a table/dissector match is not found, we display a
408 * summary of the available tables/dissectors (on stderr) and return FALSE.
409 * If everything is fine, we get the "Decode as" preference activated,
410 * then we return TRUE.
413 add_decode_as(const gchar *cl_param)
417 gchar *decoded_param;
418 gchar *remaining_param;
420 gchar *dissector_str;
421 dissector_handle_t dissector_matching;
422 dissector_table_t table_matching;
423 ftenum_t dissector_table_selector_type;
424 struct protocol_name_search user_protocol_name;
426 /* The following code will allocate and copy the command-line options in a string pointed by decoded_param */
429 decoded_param = g_malloc( sizeof(gchar) * (strlen(cl_param) + 1) ); /* Allocate enough space to have a working copy of the command-line parameter */
430 g_assert(decoded_param);
431 strcpy(decoded_param, cl_param);
434 /* The lines below will parse this string (modifying it) to extract all
435 necessary information. Note that decoded_param is still needed since
436 strings are not copied - we just save pointers. */
438 /* This section extracts a layer type (table_name) from decoded_param */
439 table_name = decoded_param; /* Layer type string starts from beginning */
441 remaining_param = strchr(table_name, '=');
442 if (remaining_param == NULL) {
443 cmdarg_err("Parameter \"%s\" doesn't follow the template \"%s\"", cl_param, decode_as_arg_template);
444 /* If the argument does not follow the template, carry on anyway to check
445 if the table name is at least correct. If remaining_param is NULL,
446 we'll exit anyway further down */
449 *remaining_param = '\0'; /* Terminate the layer type string (table_name) where '=' was detected */
452 /* Remove leading and trailing spaces from the table name */
453 while ( table_name[0] == ' ' )
455 while ( table_name[strlen(table_name) - 1] == ' ' )
456 table_name[strlen(table_name) - 1] = '\0'; /* Note: if empty string, while loop will eventually exit */
458 /* The following part searches a table matching with the layer type specified */
459 table_matching = NULL;
461 /* Look for the requested table */
462 if ( !(*(table_name)) ) { /* Is the table name empty, if so, don't even search for anything, display a message */
463 cmdarg_err("No layer type specified"); /* Note, we don't exit here, but table_matching will remain NULL, so we exit below */
466 table_matching = find_dissector_table(table_name);
467 if (!table_matching) {
468 cmdarg_err("Unknown layer type -- %s", table_name); /* Note, we don't exit here, but table_matching will remain NULL, so we exit below */
472 if (!table_matching) {
473 /* Display a list of supported layer types to help the user, if the
474 specified layer type was not found */
475 cmdarg_err("Valid layer types are:");
476 fprint_all_layer_types(stderr);
478 if (remaining_param == NULL || !table_matching) {
479 /* Exit if the layer type was not found, or if no '=' separator was found
481 g_free(decoded_param);
485 if (*(remaining_param + 1) != '=') { /* Check for "==" and not only '=' */
486 cmdarg_err("WARNING: -d requires \"==\" instead of \"=\". Option will be treated as \"%s==%s\"", table_name, remaining_param + 1);
489 remaining_param++; /* Move to the second '=' */
490 *remaining_param = '\0'; /* Remove the second '=' */
492 remaining_param++; /* Position after the layer type string */
494 /* This section extracts a selector value (selector_str) from decoded_param */
496 selector_str = remaining_param; /* Next part starts with the selector number */
498 remaining_param = strchr(selector_str, ',');
499 if (remaining_param == NULL) {
500 cmdarg_err("Parameter \"%s\" doesn't follow the template \"%s\"", cl_param, decode_as_arg_template);
501 /* If the argument does not follow the template, carry on anyway to check
502 if the selector value is at least correct. If remaining_param is NULL,
503 we'll exit anyway further down */
506 *remaining_param = '\0'; /* Terminate the selector number string (selector_str) where ',' was detected */
509 dissector_table_selector_type = get_dissector_table_selector_type(table_name);
511 switch (dissector_table_selector_type) {
517 /* The selector for this table is an unsigned number. Parse it as such.
518 There's no need to remove leading and trailing spaces from the
519 selector number string, because sscanf will do that for us. */
520 if ( sscanf(selector_str, "%u", &selector) != 1 ) {
521 cmdarg_err("Invalid selector number \"%s\"", selector_str);
522 g_free(decoded_param);
529 /* The selector for this table is a string. */
533 /* There are currently no dissector tables with any types other
534 than the ones listed above. */
535 g_assert_not_reached();
538 if (remaining_param == NULL) {
539 /* Exit if no ',' separator was found (see above) */
540 cmdarg_err("Valid protocols for layer type \"%s\" are:", table_name);
541 fprint_all_protocols_for_layer_types(stderr, table_name);
542 g_free(decoded_param);
546 remaining_param++; /* Position after the selector number string */
548 /* This section extracts a protocol filter name (dissector_str) from decoded_param */
550 dissector_str = remaining_param; /* All the rest of the string is the dissector (decode as protocol) name */
552 /* Remove leading and trailing spaces from the dissector name */
553 while ( dissector_str[0] == ' ' )
555 while ( dissector_str[strlen(dissector_str) - 1] == ' ' )
556 dissector_str[strlen(dissector_str) - 1] = '\0'; /* Note: if empty string, while loop will eventually exit */
558 dissector_matching = NULL;
560 /* We now have a pointer to the handle for the requested table inside the variable table_matching */
561 if ( ! (*dissector_str) ) { /* Is the dissector name empty, if so, don't even search for a matching dissector and display all dissectors found for the selected table */
562 cmdarg_err("No protocol name specified"); /* Note, we don't exit here, but dissector_matching will remain NULL, so we exit below */
565 user_protocol_name.nb_match = 0;
566 user_protocol_name.searched_name = dissector_str;
567 user_protocol_name.matched_handle = NULL;
569 dissector_table_foreach_handle(table_name, find_protocol_name_func, &user_protocol_name); /* Go and perform the search for this dissector in the this table's dissectors' names and shortnames */
571 if (user_protocol_name.nb_match != 0) {
572 dissector_matching = user_protocol_name.matched_handle;
573 if (user_protocol_name.nb_match > 1) {
574 cmdarg_err("WARNING: Protocol \"%s\" matched %u dissectors, first one will be used", dissector_str, user_protocol_name.nb_match);
578 /* OK, check whether the problem is that there isn't any such
579 protocol, or that there is but it's not specified as a protocol
580 that's valid for that dissector table.
581 Note, we don't exit here, but dissector_matching will remain NULL,
583 if (proto_get_id_by_filter_name(dissector_str) == -1) {
584 /* No such protocol */
585 cmdarg_err("Unknown protocol -- \"%s\"", dissector_str);
587 cmdarg_err("Protocol \"%s\" isn't valid for layer type \"%s\"",
588 dissector_str, table_name);
593 if (!dissector_matching) {
594 cmdarg_err("Valid protocols for layer type \"%s\" are:", table_name);
595 fprint_all_protocols_for_layer_types(stderr, table_name);
596 g_free(decoded_param);
600 /* This is the end of the code that parses the command-line options.
601 All information is now stored in the variables:
605 The above variables that are strings are still pointing to areas within
606 decoded_parm. decoded_parm thus still needs to be kept allocated in
607 until we stop needing these variables
608 decoded_param will be deallocated at each exit point of this function */
611 /* We now have a pointer to the handle for the requested dissector
612 (requested protocol) inside the variable dissector_matching */
613 switch (dissector_table_selector_type) {
619 /* The selector for this table is an unsigned number. */
620 dissector_change(table_name, selector, dissector_matching);
625 /* The selector for this table is a string. */
626 dissector_change_string(table_name, selector_str, dissector_matching);
630 /* There are currently no dissector tables with any types other
631 than the ones listed above. */
632 g_assert_not_reached();
634 g_free(decoded_param); /* "Decode As" rule has been succesfully added */
639 log_func_ignore (const gchar *log_domain _U_, GLogLevelFlags log_level _U_,
640 const gchar *message _U_, gpointer user_data _U_)
645 output_file_description(const char *fname)
647 char *save_file_string;
649 /* Get a string that describes what we're writing to */
650 if (strcmp(fname, "-") == 0) {
651 /* We're writing to the standard output */
652 save_file_string = g_strdup("standard output");
654 /* We're writing to a file with the name in save_file */
655 save_file_string = g_strdup_printf("file \"%s\"", fname);
657 return save_file_string;
661 main(int argc, char *argv[])
665 gboolean arg_error = FALSE;
671 char *gpf_path, *pf_path;
672 char *gdp_path, *dp_path;
673 int gpf_open_errno, gpf_read_errno;
674 int pf_open_errno, pf_read_errno;
675 int gdp_open_errno, gdp_read_errno;
676 int dp_open_errno, dp_read_errno;
679 gboolean capture_filter_specified = FALSE;
680 gboolean list_link_layer_types = FALSE;
681 gboolean start_capture = FALSE;
683 gboolean capture_option_specified = FALSE;
685 gboolean quiet = FALSE;
686 int out_file_type = WTAP_FILE_PCAP;
687 gchar *cf_name = NULL, *rfilter = NULL;
688 #ifdef HAVE_PCAP_OPEN_DEAD
689 struct bpf_program fcode;
691 dfilter_t *rfcode = NULL;
694 GLogLevelFlags log_flags;
697 #define OPTSTRING_INIT "a:b:c:d:Df:F:hi:lLnN:o:pqr:R:s:St:T:vVw:xX:y:z:"
700 #define OPTSTRING_WIN32 "B:"
702 #define OPTSTRING_WIN32 ""
705 #define OPTSTRING_WIN32 ""
706 #endif /* HAVE_LIBPCAP */
708 static const char optstring[] = OPTSTRING_INIT OPTSTRING_WIN32;
711 * Get credential information for later use.
713 get_credential_info();
715 /* nothing more than the standard GLib handler, but without a warning */
718 G_LOG_LEVEL_CRITICAL|
723 G_LOG_FLAG_FATAL|G_LOG_FLAG_RECURSION;
725 g_log_set_handler(NULL,
727 log_func_ignore, NULL /* user_data */);
728 g_log_set_handler(LOG_DOMAIN_CAPTURE_CHILD,
730 log_func_ignore, NULL /* user_data */);
732 /* initialize memory allocation subsystem */
736 initialize_funnel_ops();
739 capture_opts_init(&capture_opts, NULL /* cfile */);
742 timestamp_set_type(TS_RELATIVE);
743 timestamp_set_precision(TS_PREC_AUTO);
745 /* Register all dissectors; we must do this before checking for the
746 "-G" flag, as the "-G" flag dumps information registered by the
747 dissectors, and we must do it before we read the preferences, in
748 case any dissectors register preferences. */
749 epan_init(PLUGIN_DIR,register_all_protocols,register_all_protocol_handoffs,
750 failure_message,open_failure_message,read_failure_message);
752 /* Register all tap listeners; we do this before we parse the arguments,
753 as the "-z" argument can specify a registered tap. */
755 /* we register the plugin taps before the other taps because
756 stats_tree taps plugins will be registered as tap listeners
757 by stats_tree_stat.c and need to registered before that */
759 register_all_plugin_tap_listeners();
761 register_all_tap_listeners();
763 /* Now register the preferences for any non-dissector modules.
764 We must do that before we read the preferences as well. */
765 prefs_register_modules();
767 /* If invoked with the "-G" flag, we dump out information based on
768 the argument to the "-G" flag; if no argument is specified,
769 for backwards compatibility we dump out a glossary of display
772 XXX - we do this here, for now, to support "-G" with no arguments.
773 If none of our build or other processes uses "-G" with no arguments,
774 we can just process it with the other arguments. */
775 if (argc >= 2 && strcmp(argv[1], "-G") == 0) {
777 proto_registrar_dump_fields(1);
779 if (strcmp(argv[2], "fields") == 0)
780 proto_registrar_dump_fields(1);
781 else if (strcmp(argv[2], "fields2") == 0)
782 proto_registrar_dump_fields(2);
783 else if (strcmp(argv[2], "fields3") == 0)
784 proto_registrar_dump_fields(3);
785 else if (strcmp(argv[2], "protocols") == 0)
786 proto_registrar_dump_protocols();
787 else if (strcmp(argv[2], "values") == 0)
788 proto_registrar_dump_values();
789 else if (strcmp(argv[2], "decodes") == 0)
790 dissector_dump_decodes();
791 else if (strcmp(argv[2], "defaultprefs") == 0)
793 else if (strcmp(argv[2], "currentprefs") == 0) {
794 read_prefs(&gpf_open_errno, &gpf_read_errno, &gpf_path,
795 &pf_open_errno, &pf_read_errno, &pf_path);
798 cmdarg_err("Invalid \"%s\" option for -G flag", argv[2]);
805 /* Set the C-language locale to the native environment. */
806 setlocale(LC_ALL, "");
808 prefs = read_prefs(&gpf_open_errno, &gpf_read_errno, &gpf_path,
809 &pf_open_errno, &pf_read_errno, &pf_path);
810 if (gpf_path != NULL) {
811 if (gpf_open_errno != 0) {
812 cmdarg_err("Can't open global preferences file \"%s\": %s.",
813 pf_path, strerror(gpf_open_errno));
815 if (gpf_read_errno != 0) {
816 cmdarg_err("I/O error reading global preferences file \"%s\": %s.",
817 pf_path, strerror(gpf_read_errno));
820 if (pf_path != NULL) {
821 if (pf_open_errno != 0) {
822 cmdarg_err("Can't open your preferences file \"%s\": %s.", pf_path,
823 strerror(pf_open_errno));
825 if (pf_read_errno != 0) {
826 cmdarg_err("I/O error reading your preferences file \"%s\": %s.",
827 pf_path, strerror(pf_read_errno));
833 /* Set the name resolution code's flags from the preferences. */
834 g_resolv_flags = prefs->name_resolve;
836 /* Read the disabled protocols file. */
837 read_disabled_protos_list(&gdp_path, &gdp_open_errno, &gdp_read_errno,
838 &dp_path, &dp_open_errno, &dp_read_errno);
839 if (gdp_path != NULL) {
840 if (gdp_open_errno != 0) {
841 cmdarg_err("Could not open global disabled protocols file\n\"%s\": %s.",
842 gdp_path, strerror(gdp_open_errno));
844 if (gdp_read_errno != 0) {
845 cmdarg_err("I/O error reading global disabled protocols file\n\"%s\": %s.",
846 gdp_path, strerror(gdp_read_errno));
850 if (dp_path != NULL) {
851 if (dp_open_errno != 0) {
853 "Could not open your disabled protocols file\n\"%s\": %s.", dp_path,
854 strerror(dp_open_errno));
856 if (dp_read_errno != 0) {
858 "I/O error reading your disabled protocols file\n\"%s\": %s.", dp_path,
859 strerror(dp_read_errno));
865 /* Load Wpcap, if possible */
869 init_cap_file(&cfile);
871 /* Assemble the compile-time version information string */
872 comp_info_str = g_string_new("Compiled ");
873 get_compiled_version_info(comp_info_str);
875 /* Assemble the run-time version information string */
876 runtime_info_str = g_string_new("Running ");
877 get_runtime_version_info(runtime_info_str);
879 /* Print format defaults to this. */
880 print_format = PR_FMT_TEXT;
882 /* Now get our args */
883 while ((opt = getopt(argc, argv, optstring)) != -1) {
885 case 'a': /* autostop criteria */
886 case 'b': /* Ringbuffer option */
887 case 'c': /* Capture xxx packets */
888 case 'f': /* capture filter */
889 case 'i': /* Use interface xxx */
890 case 'p': /* Don't capture in promiscuous mode */
891 case 's': /* Set the snapshot (capture) length */
892 case 'w': /* Write to capture file xxx */
893 case 'y': /* Set the pcap data link type */
895 case 'B': /* Buffer size */
898 status = capture_opts_add_opt(&capture_opts, opt, optarg, &start_capture);
903 capture_option_specified = TRUE;
907 case 'd': /* Decode as rule */
908 if (!add_decode_as(optarg))
911 case 'D': /* Print a list of capture devices and exit */
913 status = capture_opts_list_interfaces();
916 capture_option_specified = TRUE;
921 out_file_type = wtap_short_string_to_file_type(optarg);
922 if (out_file_type < 0) {
923 cmdarg_err("\"%s\" isn't a valid capture file type", optarg);
924 list_capture_types();
928 case 'h': /* Print help and exit */
932 case 'l': /* "Line-buffer" standard output */
933 /* This isn't line-buffering, strictly speaking, it's just
934 flushing the standard output after the information for
935 each packet is printed; however, that should be good
936 enough for all the purposes to which "-l" is put (and
937 is probably actually better for "-V", as it does fewer
940 See the comment in "process_packet()" for an explanation of
941 why we do that, and why we don't just use "setvbuf()" to
942 make the standard output line-buffered (short version: in
943 Windows, "line-buffered" is the same as "fully-buffered",
944 and the output buffer is only flushed when it fills up). */
945 line_buffered = TRUE;
947 case 'L': /* Print list of link-layer types and exit */
949 list_link_layer_types = TRUE;
952 capture_option_specified = TRUE;
956 case 'n': /* No name resolution */
957 g_resolv_flags = RESOLV_NONE;
959 case 'N': /* Select what types of addresses/port #s to resolve */
960 if (g_resolv_flags == RESOLV_ALL)
961 g_resolv_flags = RESOLV_NONE;
962 badopt = string_to_name_resolve(optarg, &g_resolv_flags);
963 if (badopt != '\0') {
964 cmdarg_err("-N specifies unknown resolving option '%c'; valid options are 'm', 'n', and 't'",
969 case 'o': /* Override preference from command line */
970 switch (prefs_set_pref(optarg)) {
972 case PREFS_SET_SYNTAX_ERR:
973 cmdarg_err("Invalid -o flag \"%s\"", optarg);
977 case PREFS_SET_NO_SUCH_PREF:
978 case PREFS_SET_OBSOLETE:
979 cmdarg_err("-o flag \"%s\" specifies unknown preference", optarg);
984 case 'q': /* Quiet */
987 case 'r': /* Read capture file xxx */
988 cf_name = g_strdup(optarg);
990 case 'R': /* Read file filter */
993 case 'S': /* show packets in real time */
994 print_packet_info = TRUE;
996 case 't': /* Time stamp type */
997 if (strcmp(optarg, "r") == 0)
998 timestamp_set_type(TS_RELATIVE);
999 else if (strcmp(optarg, "a") == 0)
1000 timestamp_set_type(TS_ABSOLUTE);
1001 else if (strcmp(optarg, "ad") == 0)
1002 timestamp_set_type(TS_ABSOLUTE_WITH_DATE);
1003 else if (strcmp(optarg, "d") == 0)
1004 timestamp_set_type(TS_DELTA);
1006 cmdarg_err("Invalid time stamp type \"%s\"",
1008 cmdarg_err_cont("It must be \"r\" for relative, \"a\" for absolute,");
1009 cmdarg_err_cont("\"ad\" for absolute with date, or \"d\" for delta.");
1013 case 'T': /* printing Type */
1014 if (strcmp(optarg, "text") == 0) {
1015 output_action = WRITE_TEXT;
1016 print_format = PR_FMT_TEXT;
1017 } else if (strcmp(optarg, "ps") == 0) {
1018 output_action = WRITE_TEXT;
1019 print_format = PR_FMT_PS;
1020 } else if (strcmp(optarg, "pdml") == 0) {
1021 output_action = WRITE_XML;
1023 } else if (strcmp(optarg, "psml") == 0) {
1024 output_action = WRITE_XML;
1027 cmdarg_err("Invalid -T parameter.");
1028 cmdarg_err_cont("It must be \"ps\", \"text\", \"pdml\", or \"psml\".");
1032 case 'v': /* Show version and exit */
1033 printf("Tethereal " VERSION "%s\n"
1040 svnversion, get_copyright_info(), comp_info_str->str,
1041 runtime_info_str->str);
1044 case 'V': /* Verbose */
1047 case 'x': /* Print packet data in hex (and ASCII) */
1054 /* We won't call the init function for the stat this soon
1055 as it would disallow MATE's fields (which are registered
1056 by the preferences set callback) from being used as
1057 part of a tap filter. Instead, we just add the argument
1058 to a list of stat arguments. */
1059 if (!process_stat_cmd_arg(optarg)) {
1060 cmdarg_err("invalid -z argument.");
1061 cmdarg_err_cont(" -z argument must be one of :");
1062 list_stat_cmd_args();
1067 case '?': /* Bad flag - print usage message */
1070 list_capture_types();
1080 /* If no capture filter or read filter has been specified, and there are
1081 still command-line arguments, treat them as the tokens of a capture
1082 filter (if no "-r" flag was specified) or a read filter (if a "-r"
1083 flag was specified. */
1084 if (optind < argc) {
1085 if (cf_name != NULL) {
1086 if (rfilter != NULL) {
1087 cmdarg_err("Read filters were specified both with \"-R\" "
1088 "and with additional command-line arguments");
1091 rfilter = get_args_as_string(argc, argv, optind);
1094 if (capture_filter_specified) {
1095 cmdarg_err("Capture filters were specified both with \"-f\""
1096 " and with additional command-line arguments");
1099 capture_opts.cfilter = get_args_as_string(argc, argv, optind);
1101 capture_option_specified = TRUE;
1106 if (!capture_opts.saving_to_file) {
1107 /* We're not saving the capture to a file; if "-q" wasn't specified,
1108 we should print packet information */
1110 print_packet_info = TRUE;
1112 /* We're saving to a file; if we're writing to the standard output.
1113 and we'll also be writing dissected packets to the standard
1114 output, reject the request. At best, we could redirect that
1115 to the standard error; we *can't* write both to the standard
1116 output and have either of them be useful. */
1117 if (strcmp(capture_opts.save_file, "-") == 0 && print_packet_info) {
1118 cmdarg_err("You can't write both raw packet data and dissected packets"
1119 " to the standard output.");
1124 #ifndef HAVE_LIBPCAP
1125 if (capture_option_specified)
1126 cmdarg_err("This version of Tethereal was not built with support for capturing packets.");
1133 /* We don't support capture filters when reading from a capture file
1134 (the BPF compiler doesn't support all link-layer types that we
1135 support in capture files we read). */
1137 if (cf_name != NULL) {
1138 if (capture_filter_specified) {
1139 cmdarg_err("Only read filters, not capture filters, "
1140 "can be specified when reading a capture file.");
1147 if (output_action != WRITE_TEXT) {
1148 cmdarg_err("Raw packet hex data can only be printed as text or PostScript");
1154 if (list_link_layer_types) {
1155 /* We're supposed to list the link-layer types for an interface;
1156 did the user also specify a capture file to be read? */
1158 /* Yes - that's bogus. */
1159 cmdarg_err("You can't specify -L and a capture file to be read.");
1162 /* No - did they specify a ring buffer option? */
1163 if (capture_opts.multi_files_on) {
1164 cmdarg_err("Ring buffer requested, but a capture isn't being done.");
1168 /* If they didn't specify a "-w" flag, but specified a maximum capture
1169 file size, tell them that this doesn't work, and exit. */
1170 if (capture_opts.has_autostop_filesize && capture_opts.save_file == NULL) {
1171 cmdarg_err("Maximum capture file size specified, but "
1172 "capture isn't being saved to a file.");
1178 * "-r" was specified, so we're reading a capture file.
1179 * Capture options don't apply here.
1181 if (capture_opts.multi_files_on) {
1182 cmdarg_err("Multiple capture files requested, but "
1183 "a capture isn't being done.");
1186 if (capture_opts.has_file_duration) {
1187 cmdarg_err("Switching capture files after a time interval was specified, but "
1188 "a capture isn't being done.");
1191 if (capture_opts.has_ring_num_files) {
1192 cmdarg_err("A ring buffer of capture files was specified, but "
1193 "a capture isn't being done.");
1196 if (capture_opts.has_autostop_files) {
1197 cmdarg_err("A maximum number of capture files was specified, but "
1198 "a capture isn't being done.");
1201 if (capture_opts.has_autostop_packets) {
1202 cmdarg_err("A maximum number of captured packets was specified, but "
1203 "a capture isn't being done.");
1206 if (capture_opts.has_autostop_filesize) {
1207 cmdarg_err("A maximum capture file size was specified, but "
1208 "a capture isn't being done.");
1211 if (capture_opts.has_autostop_duration) {
1212 cmdarg_err("A maximum capture time was specified, but "
1213 "a capture isn't being done.");
1218 * "-r" wasn't specified, so we're doing a live capture.
1220 if (capture_opts.saving_to_file) {
1221 /* They specified a "-w" flag, so we'll be saving to a capture file. */
1223 /* When capturing, we only support writing libpcap format. */
1224 if (out_file_type != WTAP_FILE_PCAP) {
1225 cmdarg_err("Live captures can only be saved in libpcap format.");
1228 if (capture_opts.multi_files_on) {
1229 /* Multiple-file mode works only under certain conditions:
1230 a) it doesn't work if you're writing to the standard output;
1231 b) it doesn't work if you're writing to a pipe;
1232 c) it makes no sense if the maximum file size is set to "infinite"
1233 (XXX - shouldn't that be "if there is no stop criterion",
1234 as you might want to switch files based on a packet count
1236 if (strcmp(capture_opts.save_file, "-") == 0) {
1237 cmdarg_err("Multiple capture files requested, but "
1238 "the capture is being written to the standard output.");
1241 if (capture_opts.output_to_pipe) {
1242 cmdarg_err("Multiple capture files requested, but "
1243 "the capture file is a pipe.");
1246 if (!capture_opts.has_autostop_filesize) {
1247 cmdarg_err("Multiple capture files requested, but "
1248 "no maximum capture file size was specified.");
1253 /* They didn't specify a "-w" flag, so we won't be saving to a
1254 capture file. Check for options that only make sense if
1255 we're saving to a file. */
1256 if (capture_opts.has_autostop_filesize) {
1257 cmdarg_err("Maximum capture file size specified, but "
1258 "capture isn't being saved to a file.");
1261 if (capture_opts.multi_files_on) {
1262 cmdarg_err("Multiple capture files requested, but "
1263 "the capture isn't being saved to a file.");
1272 /* Start windows sockets */
1273 WSAStartup( MAKEWORD( 1, 1 ), &wsaData );
1276 /* Notify all registered modules that have had any of their preferences
1277 changed either from one of the preferences file or from the command
1278 line that their preferences have changed. */
1281 /* At this point MATE will have registered its field array so we can
1282 have a tap filter with one of MATE's late-registered fields as part
1283 of the filter. We can now process all the "-z" arguments. */
1284 start_requested_stats();
1286 /* disabled protocols as per configuration file */
1287 if (gdp_path == NULL && dp_path == NULL) {
1288 set_disabled_protos_list();
1291 /* Build the column format array */
1292 col_setup(&cfile.cinfo, prefs->num_cols);
1293 for (i = 0; i < cfile.cinfo.num_cols; i++) {
1294 cfile.cinfo.col_fmt[i] = get_column_format(i);
1295 cfile.cinfo.col_title[i] = g_strdup(get_column_title(i));
1296 cfile.cinfo.fmt_matx[i] = (gboolean *) g_malloc0(sizeof(gboolean) *
1298 get_column_format_matches(cfile.cinfo.fmt_matx[i], cfile.cinfo.col_fmt[i]);
1299 cfile.cinfo.col_data[i] = NULL;
1300 if (cfile.cinfo.col_fmt[i] == COL_INFO)
1301 cfile.cinfo.col_buf[i] = (gchar *) g_malloc(sizeof(gchar) * COL_MAX_INFO_LEN);
1303 cfile.cinfo.col_buf[i] = (gchar *) g_malloc(sizeof(gchar) * COL_MAX_LEN);
1304 cfile.cinfo.col_fence[i] = 0;
1305 cfile.cinfo.col_expr[i] = (gchar *) g_malloc(sizeof(gchar) * COL_MAX_LEN);
1306 cfile.cinfo.col_expr_val[i] = (gchar *) g_malloc(sizeof(gchar) * COL_MAX_LEN);
1309 for (i = 0; i < cfile.cinfo.num_cols; i++) {
1312 for (j = 0; j < NUM_COL_FMTS; j++) {
1313 if (!cfile.cinfo.fmt_matx[i][j])
1316 if (cfile.cinfo.col_first[j] == -1)
1317 cfile.cinfo.col_first[j] = i;
1318 cfile.cinfo.col_last[j] = i;
1323 capture_opts_trim_snaplen(&capture_opts, MIN_PACKET_SIZE);
1324 capture_opts_trim_ring_num_files(&capture_opts);
1327 if (rfilter != NULL) {
1328 if (!dfilter_compile(rfilter, &rfcode)) {
1329 cmdarg_err("%s", dfilter_error_msg);
1331 #ifdef HAVE_PCAP_OPEN_DEAD
1335 pc = pcap_open_dead(DLT_EN10MB, MIN_PACKET_SIZE);
1337 if (pcap_compile(pc, &fcode, rfilter, 0, 0) != -1) {
1339 " Note: That display filter code looks like a valid capture filter;");
1341 " maybe you mixed them up?");
1350 cfile.rfcode = rfcode;
1352 if (print_packet_info) {
1353 /* If we're printing as text or PostScript, we have
1354 to create a print stream. */
1355 if (output_action == WRITE_TEXT) {
1356 switch (print_format) {
1359 print_stream = print_stream_text_stdio_new(stdout);
1363 print_stream = print_stream_ps_stdio_new(stdout);
1367 g_assert_not_reached();
1372 /* We have to dissect each packet if:
1374 we're printing information about each packet;
1376 we're using a read filter on the packets;
1378 we're using any taps. */
1379 do_dissection = print_packet_info || rfcode || have_tap_listeners();
1383 * We're reading a capture file.
1387 * Immediately relinquish any special privileges we have; we must not
1388 * be allowed to read any capture files the user running Tethereal
1391 relinquish_special_privs_perm();
1393 if (cf_open(&cfile, cf_name, FALSE, &err) != CF_OK) {
1398 /* Set timestamp precision; there should arguably be a command-line
1399 option to let the user set this. */
1400 switch(wtap_file_tsprecision(cfile.wth)) {
1401 case(WTAP_FILE_TSPREC_SEC):
1402 timestamp_set_precision(TS_PREC_AUTO_SEC);
1404 case(WTAP_FILE_TSPREC_DSEC):
1405 timestamp_set_precision(TS_PREC_AUTO_DSEC);
1407 case(WTAP_FILE_TSPREC_CSEC):
1408 timestamp_set_precision(TS_PREC_AUTO_CSEC);
1410 case(WTAP_FILE_TSPREC_MSEC):
1411 timestamp_set_precision(TS_PREC_AUTO_MSEC);
1413 case(WTAP_FILE_TSPREC_USEC):
1414 timestamp_set_precision(TS_PREC_AUTO_USEC);
1416 case(WTAP_FILE_TSPREC_NSEC):
1417 timestamp_set_precision(TS_PREC_AUTO_NSEC);
1420 g_assert_not_reached();
1423 /* Process the packets in the file */
1424 err = load_cap_file(&cfile, capture_opts.save_file, out_file_type);
1431 /* No capture file specified, so we're supposed to do a live capture
1432 (or get a list of link-layer types for a live capture device);
1433 do we have support for live captures? */
1440 cmdarg_err("WinPcap couldn't be found.");
1441 detailed_err = cant_load_winpcap_err("Tethereal");
1442 cmdarg_err_cont("%s", detailed_err);
1443 g_free(detailed_err);
1448 /* trim the interface name and exit if that failed */
1449 if (!capture_opts_trim_iface(&capture_opts,
1450 (prefs->capture_device) ? get_if_name(prefs->capture_device) : NULL)) {
1454 /* if requested, list the link layer types and exit */
1455 if (list_link_layer_types) {
1456 status = capture_opts_list_link_layer_types(&capture_opts);
1460 if (!print_packet_info && !quiet) {
1462 * We're not printing information for each packet, and the user
1463 * didn't ask us not to print a count of packets as they arrive,
1464 * so print that count so the user knows that packets are arriving.
1466 * XXX - what if the user wants to do a live capture, doesn't want
1467 * to save it to a file, doesn't want information printed for each
1468 * packet, does want some "-z" statistic, and wants packet counts
1469 * so they know whether they're seeing any packets?
1471 print_packet_counts = TRUE;
1474 /* For now, assume libpcap gives microsecond precision. */
1475 timestamp_set_precision(TS_PREC_AUTO_USEC);
1479 if (capture_opts.multi_files_on) {
1483 /* No - complain. */
1484 cmdarg_err("This version of Tethereal was not built with support for capturing packets.");
1489 draw_tap_listeners(TRUE);
1490 funnel_dump_all_text_windows();
1497 /* Do the low-level work of a capture.
1498 Returns TRUE if it succeeds, FALSE otherwise. */
1500 static condition *volatile cnd_file_duration = NULL; /* this must be visible in process_packet */
1506 int volatile volatile_err = 0;
1507 int volatile inpkts = 0;
1509 condition *volatile cnd_autostop_size = NULL;
1510 condition *volatile cnd_autostop_duration = NULL;
1513 void (*oldhandler)(int);
1514 guchar pcap_data[WTAP_MAX_PACKET_SIZE];
1516 struct pcap_stat stats;
1519 gboolean cfilter_error = FALSE;
1520 char errmsg[1024+1];
1521 char secondary_errmsg[4096+1];
1524 /* Initialize all data structures used for dissection. */
1527 ld.wtap_linktype = WTAP_ENCAP_UNKNOWN;
1529 ld.packet_cb = capture_pcap_cb;
1532 /* open the "input file" from network interface or capture pipe */
1533 if (!capture_loop_open_input(&capture_opts, &ld, errmsg, sizeof(errmsg),
1534 secondary_errmsg, sizeof(secondary_errmsg))) {
1539 * We've opened the capture device, so we shouldn't need any special
1540 * privileges any more; relinquish those privileges.
1542 * XXX - if we have saved set-user-ID support, we should give up those
1543 * privileges immediately, and then reclaim them long enough to get
1544 * a list of network interfaces and to open one, and then give them
1545 * up again, so that stuff we do while processing the argument list,
1546 * reading the user's preferences, loading and starting plugins
1547 * (especially *user* plugins), etc. is done with the user's privileges,
1548 * not special privileges.
1550 relinquish_special_privs_perm();
1552 /* init the input filter from the network interface (capture pipe will do nothing) */
1553 switch (capture_loop_init_filter(ld.pcap_h, ld.from_cap_pipe, capture_opts.iface, capture_opts.cfilter)) {
1555 case INITFILTER_NO_ERROR:
1558 case INITFILTER_BAD_FILTER:
1559 cfilter_error = TRUE;
1560 g_snprintf(errmsg, sizeof(errmsg), "%s", pcap_geterr(ld.pcap_h));
1561 *secondary_errmsg = '\0';
1564 case INITFILTER_OTHER_ERROR:
1565 g_snprintf(errmsg, sizeof(errmsg), "Can't install filter (%s).",
1566 pcap_geterr(ld.pcap_h));
1567 g_snprintf(secondary_errmsg, sizeof(secondary_errmsg), "%s", please_report);
1571 if (capture_opts.saving_to_file) {
1572 /* open the output file (temporary/specified name/ringbuffer/named pipe/stdout) */
1573 if (!capture_loop_open_output(&capture_opts, &save_file_fd, errmsg, sizeof(errmsg))) {
1574 *secondary_errmsg = '\0';
1578 /* set up to write to the already-opened capture output file/files */
1579 if(!capture_loop_init_output(&capture_opts, save_file_fd, &ld, errmsg, sizeof errmsg)) {
1580 *secondary_errmsg = '\0';
1584 /* Save the capture file name. */
1585 ld.save_file = capture_opts.save_file;
1588 ld.wtap_linktype = wtap_pcap_encap_to_wtap_encap(ld.linktype);
1591 /* Catch a CTRL+C event and, if we get it, clean up and exit. */
1592 SetConsoleCtrlHandler(capture_cleanup, TRUE);
1594 /* Catch SIGINT and SIGTERM and, if we get either of them, clean up
1596 XXX - deal with signal semantics on various UNIX platforms. Or just
1597 use "sigaction()" and be done with it? */
1598 signal(SIGTERM, capture_cleanup);
1599 signal(SIGINT, capture_cleanup);
1600 if ((oldhandler = signal(SIGHUP, capture_cleanup)) != SIG_DFL)
1601 signal(SIGHUP, oldhandler);
1604 /* Catch SIGINFO and, if we get it and we're capturing to a file in
1605 quiet mode, report the number of packets we've captured. */
1606 signal(SIGINFO, report_counts_siginfo);
1607 #endif /* SIGINFO */
1610 /* Let the user know what interface was chosen. */
1611 descr = get_interface_descriptive_name(capture_opts.iface);
1612 fprintf(stderr, "Capturing on %s\n", descr);
1615 /* initialize capture stop conditions */
1616 init_capture_stop_conditions();
1617 /* create stop conditions */
1618 if (capture_opts.has_autostop_filesize)
1619 cnd_autostop_size = cnd_new((const char*)CND_CLASS_CAPTURESIZE,
1620 (long)capture_opts.autostop_filesize * 1024);
1621 if (capture_opts.has_autostop_duration)
1622 cnd_autostop_duration = cnd_new((const char*)CND_CLASS_TIMEOUT,
1623 (gint32)capture_opts.autostop_duration);
1625 if (capture_opts.multi_files_on && capture_opts.has_file_duration)
1626 cnd_file_duration = cnd_new(CND_CLASS_TIMEOUT, capture_opts.file_duration);
1628 if (!setjmp(ld.stopenv)) {
1630 ld.packet_count = 0;
1635 /* We need to be careful with automatic variables defined in the
1636 outer scope which are changed inside the loop. Most compilers
1637 don't try to roll them back to their original values after the
1638 longjmp which causes the loop to finish, but all that the
1639 standards say is that their values are indeterminate. If we
1640 don't want them to be rolled back, we should define them with the
1641 volatile attribute (paraphrasing W. Richard Stevens, Advanced
1642 Programming in the UNIX Environment, p. 178).
1644 The "err" variable causes a particular problem. If we give it
1645 the volatile attribute, then when we pass a reference to it (as
1646 in "&err") to a function, GCC warns: "passing arg <n> of
1647 <function> discards qualifiers from pointer target type".
1648 Therefore within the loop and just beyond we don't use "err".
1649 Within the loop we define "loop_err", and assign its value to
1650 "volatile_err", which is in the outer scope and is checked when
1653 We also define "packet_count_prev" here to keep things tidy,
1654 since it's used only inside the loop. If it were defined in the
1655 outer scope, GCC would give a warning (unnecessary in this case)
1656 that it might be clobbered, and we'd need to give it the volatile
1657 attribute to suppress the warning. */
1660 int packet_count_prev = 0;
1662 if (cnd_autostop_size == NULL && cnd_autostop_duration == NULL) {
1663 /* We're not stopping at a particular capture file size, and we're
1664 not stopping after some particular amount of time has expired,
1665 so either we have no stop condition or the only stop condition
1666 is a maximum packet count.
1668 If there's no maximum packet count, pass it -1, meaning "until
1669 you run out of packets in the bufferful you read". Otherwise,
1670 pass it the number of packets we have left to capture.
1672 We don't call "pcap_loop()" as, if we're saving to a file that's
1673 a FIFO, we want to flush the FIFO after we're done processing
1674 this libpcap bufferful of packets, so that the program
1675 reading the FIFO sees the packets immediately and doesn't get
1676 any partial packet, forcing it to block in the middle of reading
1678 if (capture_opts.autostop_packets == 0)
1681 if (ld.packet_count >= capture_opts.autostop_packets) {
1682 /* XXX do we need this test here? */
1683 /* It appears there's nothing more to capture. */
1686 pcap_cnt = capture_opts.autostop_packets - ld.packet_count;
1689 /* We need to check the capture file size or the timeout after
1694 if (ld.from_cap_pipe) {
1695 inpkts = cap_pipe_dispatch(&ld, pcap_data, errmsg, sizeof errmsg);
1698 inpkts = pcap_dispatch(ld.pcap_h, pcap_cnt, ld.packet_cb, (u_char *) &ld);
1700 /* Error from "pcap_dispatch()", or error or "no more packets" from
1701 "cap_pipe_dispatch(). */
1703 } else if (cnd_autostop_duration != NULL && cnd_eval(cnd_autostop_duration)) {
1704 /* The specified capture time has elapsed; stop the capture. */
1706 } else if (inpkts > 0) {
1707 if (capture_opts.autostop_packets != 0 &&
1708 ld.packet_count >= capture_opts.autostop_packets) {
1709 /* The specified number of packets have been captured and have
1710 passed both any capture filter in effect and any read filter
1713 } else if (cnd_autostop_size != NULL &&
1714 cnd_eval(cnd_autostop_size, (guint32)ld.bytes_written)) {
1715 /* We're saving the capture to a file, and the capture file reached
1716 its maximum size. */
1717 if (capture_opts.multi_files_on) {
1718 /* Switch to the next ringbuffer file */
1719 if (ringbuf_switch_file(&ld.pdh, &capture_opts.save_file,
1720 &save_file_fd, &ld.bytes_written,
1722 /* File switch succeeded: reset the condition */
1723 cnd_reset(cnd_autostop_size);
1724 if (cnd_file_duration) {
1725 cnd_reset(cnd_file_duration);
1728 /* File switch failed: stop here */
1729 volatile_err = loop_err;
1733 /* No ringbuffer - just stop. */
1737 if (capture_opts.output_to_pipe) {
1738 if (ld.packet_count > packet_count_prev) {
1739 libpcap_dump_flush(ld.pdh, NULL);
1740 packet_count_prev = ld.packet_count;
1744 } /* while (ld.go) */
1746 /* delete stop conditions */
1747 if (cnd_autostop_size != NULL)
1748 cnd_delete(cnd_autostop_size);
1749 if (cnd_autostop_duration != NULL)
1750 cnd_delete(cnd_autostop_duration);
1751 if (cnd_file_duration != NULL)
1752 cnd_delete(cnd_file_duration);
1754 if (print_packet_counts) {
1755 /* We're printing packet counts to stderr.
1756 Send a newline so that we move to the line after the packet count. */
1757 fprintf(stderr, "\n");
1760 /* If we got an error while capturing, report it. */
1763 if (ld.from_cap_pipe) {
1764 if (ld.cap_pipe_err == PIPERR) {
1765 cmdarg_err("Error while capturing packets: %s", errmsg);
1770 cmdarg_err("Error while capturing packets: %s", pcap_geterr(ld.pcap_h));
1774 if (volatile_err == 0)
1777 show_capture_file_io_error(capture_opts.save_file, volatile_err, FALSE);
1781 if (capture_opts.save_file != NULL) {
1782 /* We're saving to a file or files; close all files. */
1783 close_ok = capture_loop_close_output(&capture_opts, &ld, &err);
1785 /* If we've displayed a message about a write error, there's no point
1786 in displaying another message about an error on close. */
1787 if (!close_ok && write_ok)
1788 show_capture_file_io_error(capture_opts.save_file, err, TRUE);
1792 if (ld.from_cap_pipe && ld.cap_pipe_fd >= 0)
1793 eth_close(ld.cap_pipe_fd);
1797 /* Get the capture statistics, and, if any packets were dropped, report
1799 if (pcap_stats(ld.pcap_h, &stats) >= 0) {
1800 if (stats.ps_drop != 0) {
1801 fprintf(stderr, "%u packets dropped\n", stats.ps_drop);
1804 cmdarg_err("Can't get packet-drop statistics: %s", pcap_geterr(ld.pcap_h));
1806 pcap_close(ld.pcap_h);
1809 /* Report the number of captured packets if not reported during capture
1810 and we are saving to a file. */
1816 if (capture_opts.multi_files_on) {
1817 ringbuf_error_cleanup();
1819 g_free(capture_opts.save_file);
1820 capture_opts.save_file = NULL;
1821 if (cfilter_error) {
1822 dfilter_t *rfcode = NULL;
1823 if (dfilter_compile(capture_opts.cfilter, &rfcode) && rfcode != NULL) {
1825 "Invalid capture filter: \"%s\"!\n"
1827 "That string looks like a valid display filter; however, it isn't a valid\n"
1828 "capture filter (%s).\n"
1830 "Note that display filters and capture filters don't have the same syntax,\n"
1831 "so you can't use most display filter expressions as capture filters.\n"
1833 "See the User's Guide for a description of the capture filter syntax.",
1834 capture_opts.cfilter, errmsg);
1835 dfilter_free(rfcode);
1838 "Invalid capture filter: \"%s\"!\n"
1840 "That string isn't a valid capture filter (%s).\n"
1841 "See the User's Guide for a description of the capture filter syntax.",
1842 capture_opts.cfilter, errmsg);
1845 cmdarg_err("%s", errmsg);
1846 if (*secondary_errmsg != '\0') {
1847 fprintf(stderr, "\n");
1848 cmdarg_err_cont("%s", secondary_errmsg);
1852 if (ld.from_cap_pipe) {
1853 if (ld.cap_pipe_fd >= 0)
1854 eth_close(ld.cap_pipe_fd);
1858 if (ld.pcap_h != NULL)
1859 pcap_close(ld.pcap_h);
1866 capture_pcap_cb(u_char *user, const struct pcap_pkthdr *phdr,
1869 struct wtap_pkthdr whdr;
1870 union wtap_pseudo_header pseudo_header;
1871 const guchar *wtap_pd;
1872 loop_data *ld = (loop_data *) user;
1876 gboolean packet_accepted;
1880 * Prevent a SIGINFO handler from writing to stdout while we're
1881 * doing so; instead, have it just set a flag telling us to print
1882 * that information when we're done.
1885 #endif /* SIGINFO */
1887 /* The current packet may have arrived after a very long silence,
1888 * way past the time to switch files. In order not to have
1889 * the first packet of a new series of events as the last
1890 * [or only] packet in the file, switch before writing!
1892 if (cnd_file_duration != NULL && cnd_eval(cnd_file_duration)) {
1893 /* time elapsed for this ring file, switch to the next */
1894 if (ringbuf_switch_file(&ld->pdh, &ld->save_file, &save_file_fd,
1895 &ld->bytes_written, &loop_err)) {
1896 /* File switch succeeded: reset the condition */
1897 cnd_reset(cnd_file_duration);
1899 /* File switch failed: stop here */
1900 /* XXX - we should do something with "loop_err" */
1905 if (do_dissection) {
1906 /* We're goint to print packet information, run a read filter, or
1907 process taps. Use process_packet() to handle that; in order
1908 to do that, we need to convert from libpcap to Wiretap format.
1909 If that fails, ignore the packet (wtap_process_pcap_packet has
1910 written an error message). */
1911 wtap_pd = wtap_process_pcap_packet(ld->wtap_linktype, phdr, pd,
1912 &pseudo_header, &whdr, &err);
1913 if (wtap_pd == NULL)
1916 packet_accepted = process_packet(&cfile, 0, &whdr, &pseudo_header, wtap_pd);
1918 /* We're just writing out packets. */
1919 packet_accepted = TRUE;
1922 if (packet_accepted) {
1923 /* Count this packet. */
1928 if (ld->pdh != NULL) {
1929 if (!libpcap_write_packet(ld->pdh, phdr, pd, &ld->bytes_written, &err)) {
1930 /* Error writing to a capture file */
1931 if (print_packet_counts) {
1932 /* We're printing counts of packets captured; move to the line after
1934 fprintf(stderr, "\n");
1936 show_capture_file_io_error(ld->save_file, err, FALSE);
1937 pcap_close(ld->pcap_h);
1938 libpcap_dump_close(ld->pdh, &err);
1942 if (print_packet_counts) {
1943 /* We're printing packet counts. */
1944 if (ld->packet_count != 0) {
1945 fprintf(stderr, "\r%u ", ld->packet_count);
1946 /* stderr could be line buffered */
1954 * Allow SIGINFO handlers to write.
1959 * If a SIGINFO handler asked us to write out capture counts, do so.
1963 #endif /* SIGINFO */
1968 capture_cleanup(DWORD ctrltype _U_)
1970 /* CTRL_C_EVENT is sort of like SIGINT, CTRL_BREAK_EVENT is unique to
1971 Windows, CTRL_CLOSE_EVENT is sort of like SIGHUP, CTRL_LOGOFF_EVENT
1972 is also sort of like SIGHUP, and CTRL_SHUTDOWN_EVENT is sort of
1973 like SIGTERM at least when the machine's shutting down.
1975 For now, we handle them all as indications that we should clean up
1976 and quit, just as we handle SIGINT, SIGHUP, and SIGTERM in that
1979 However, as handlers run in a new thread, we can't just longjmp
1980 out; we have to set "ld.go" to FALSE, and must return TRUE so that
1981 no other handler - such as one that would terminate the process -
1984 XXX - for some reason, typing ^C to Tethereal, if you run this in
1985 a Cygwin console window in at least some versions of Cygwin,
1986 causes Tethereal to terminate immediately; this routine gets
1987 called, but the main loop doesn't get a chance to run and
1988 exit cleanly, at least if this is compiled with Microsoft Visual
1989 C++ (i.e., it's a property of the Cygwin console window or Bash;
1990 it happens if Tethereal is not built with Cygwin - for all I know,
1991 building it with Cygwin may make the problem go away). */
1997 capture_cleanup(int signum _U_)
1999 /* Longjmp back to the starting point; "pcap_dispatch()", on many
2000 UNIX platforms, just keeps looping if it gets EINTR, so if we set
2001 "ld.go" to FALSE and return, we won't break out of it and quit
2003 longjmp(ld.stopenv, 1);
2011 /* XXX - if we use sigaction, this doesn't have to be done.
2012 (Yes, this isn't necessary on BSD, but just in case a system
2013 where "signal()" has AT&T semantics adopts SIGINFO....) */
2014 signal(SIGINFO, report_counts_siginfo);
2015 #endif /* SIGINFO */
2017 if (!print_packet_counts) {
2018 /* Report the count only if we aren't printing a packet count
2019 as packets arrive. */
2020 fprintf(stderr, "%u packets captured\n", ld.packet_count);
2023 infoprint = FALSE; /* we just reported it */
2024 #endif /* SIGINFO */
2029 report_counts_siginfo(int signum _U_)
2031 int sav_errno = errno;
2032 /* If we've been told to delay printing, just set a flag asking
2033 that we print counts (if we're supposed to), otherwise print
2034 the count of packets captured (if we're supposed to). */
2041 #endif /* SIGINFO */
2042 #endif /* HAVE_LIBPCAP */
2045 load_cap_file(capture_file *cf, char *save_file, int out_file_type)
2048 int snapshot_length;
2053 char *save_file_string = NULL;
2055 linktype = wtap_file_encap(cf->wth);
2056 if (save_file != NULL) {
2057 /* Get a string that describes what we're writing to */
2058 save_file_string = output_file_description(save_file);
2060 /* Set up to write to the capture file. */
2061 snapshot_length = wtap_snapshot_length(cf->wth);
2062 if (snapshot_length == 0) {
2063 /* Snapshot length of input file not known. */
2064 snapshot_length = WTAP_MAX_PACKET_SIZE;
2066 pdh = wtap_dump_open(save_file, out_file_type, linktype, snapshot_length,
2067 FALSE /* compressed */, &err);
2070 /* We couldn't set up to write to the capture file. */
2073 case WTAP_ERR_UNSUPPORTED_FILE_TYPE:
2074 cmdarg_err("Capture files can't be written in that format.");
2077 case WTAP_ERR_UNSUPPORTED_ENCAP:
2078 case WTAP_ERR_ENCAP_PER_PACKET_UNSUPPORTED:
2079 cmdarg_err("The capture file being read can't be written in "
2083 case WTAP_ERR_CANT_OPEN:
2084 cmdarg_err("The %s couldn't be created for some "
2085 "unknown reason.", save_file_string);
2088 case WTAP_ERR_SHORT_WRITE:
2089 cmdarg_err("A full header couldn't be written to the %s.",
2094 cmdarg_err("The %s could not be created: %s.", save_file_string,
2095 wtap_strerror(err));
2101 if (print_packet_info) {
2102 if (!write_preamble(cf)) {
2104 show_print_file_io_error(err);
2110 while (wtap_read(cf->wth, &err, &err_info, &data_offset)) {
2111 if (process_packet(cf, data_offset, wtap_phdr(cf->wth),
2112 wtap_pseudoheader(cf->wth), wtap_buf_ptr(cf->wth))) {
2113 /* Either there's no read filtering or this packet passed the
2114 filter, so, if we're writing to a capture file, write
2117 if (!wtap_dump(pdh, wtap_phdr(cf->wth),
2118 wtap_pseudoheader(cf->wth), wtap_buf_ptr(cf->wth),
2120 /* Error writing to a capture file */
2121 show_capture_file_io_error(save_file, err, FALSE);
2122 wtap_dump_close(pdh, &err);
2129 /* Print a message noting that the read failed somewhere along the line. */
2132 case WTAP_ERR_UNSUPPORTED_ENCAP:
2133 cmdarg_err("\"%s\" has a packet with a network type that Tethereal doesn't support.\n(%s)",
2134 cf->filename, err_info);
2137 case WTAP_ERR_CANT_READ:
2138 cmdarg_err("An attempt to read from \"%s\" failed for some unknown reason.",
2142 case WTAP_ERR_SHORT_READ:
2143 cmdarg_err("\"%s\" appears to have been cut short in the middle of a packet.",
2147 case WTAP_ERR_BAD_RECORD:
2148 cmdarg_err("\"%s\" appears to be damaged or corrupt.\n(%s)",
2149 cf->filename, err_info);
2153 cmdarg_err("An error occurred while reading \"%s\": %s.",
2154 cf->filename, wtap_strerror(err));
2157 if (save_file != NULL) {
2158 /* Now close the capture file. */
2159 if (!wtap_dump_close(pdh, &err))
2160 show_capture_file_io_error(save_file, err, TRUE);
2163 if (save_file != NULL) {
2164 /* Now close the capture file. */
2165 if (!wtap_dump_close(pdh, &err))
2166 show_capture_file_io_error(save_file, err, TRUE);
2168 if (print_packet_info) {
2169 if (!write_finale()) {
2171 show_print_file_io_error(err);
2178 wtap_close(cf->wth);
2181 if (save_file_string != NULL)
2182 g_free(save_file_string);
2188 fill_in_fdata(frame_data *fdata, capture_file *cf,
2189 const struct wtap_pkthdr *phdr, long offset)
2194 fdata->num = cf->count;
2195 fdata->pkt_len = phdr->len;
2196 cum_bytes += phdr->len;
2197 fdata->cum_bytes = cum_bytes;
2198 fdata->cap_len = phdr->caplen;
2199 fdata->file_off = offset;
2200 fdata->lnk_t = phdr->pkt_encap;
2201 fdata->abs_ts = *((nstime_t *) &phdr->ts);
2202 fdata->flags.passed_dfilter = 0;
2203 fdata->flags.encoding = CHAR_ASCII;
2204 fdata->flags.visited = 0;
2205 fdata->flags.marked = 0;
2206 fdata->flags.ref_time = 0;
2207 fdata->color_filter = NULL;
2209 /* If we don't have the time stamp of the first packet in the
2210 capture, it's because this is the first packet. Save the time
2211 stamp of this packet as the time stamp of the first packet. */
2212 if (nstime_is_zero(&first_ts)) {
2213 first_ts = fdata->abs_ts;
2216 /* If we don't have the time stamp of the previous displayed packet,
2217 it's because this is the first displayed packet. Save the time
2218 stamp of this packet as the time stamp of the previous displayed
2220 if (nstime_is_zero(&prev_ts)) {
2221 prev_ts = fdata->abs_ts;
2224 /* Get the time elapsed between the first packet and this packet. */
2225 nstime_delta(&fdata->rel_ts, &fdata->abs_ts, &first_ts);
2227 /* If it's greater than the current elapsed time, set the elapsed time
2228 to it (we check for "greater than" so as not to be confused by
2229 time moving backwards). */
2230 if ((gint32)cf->elapsed_time.secs < fdata->rel_ts.secs
2231 || ((gint32)cf->elapsed_time.secs == fdata->rel_ts.secs && (gint32)cf->elapsed_time.nsecs < fdata->rel_ts.nsecs)) {
2232 cf->elapsed_time = fdata->rel_ts;
2235 /* Get the time elapsed between the previous displayed packet and
2237 nstime_delta(&fdata->del_ts, &fdata->abs_ts, &prev_ts);
2238 prev_ts = fdata->abs_ts;
2241 /* Free up all data attached to a "frame_data" structure. */
2243 clear_fdata(frame_data *fdata)
2246 g_slist_free(fdata->pfd);
2250 process_packet(capture_file *cf, long offset, const struct wtap_pkthdr *whdr,
2251 union wtap_pseudo_header *pseudo_header, const guchar *pd)
2254 gboolean create_proto_tree;
2255 epan_dissect_t *edt;
2258 /* Count this packet. */
2261 /* If we're going to print packet information, or we're going to
2262 run a read filter, or we're going to process taps, set up to
2263 do a dissection and do so. */
2264 if (do_dissection) {
2265 fill_in_fdata(&fdata, cf, whdr, offset);
2267 if (print_packet_info) {
2268 /* Grab any resolved addresses */
2270 if (g_resolv_flags) {
2271 host_name_lookup_process(NULL);
2276 if (cf->rfcode || verbose || num_tap_filters!=0)
2277 create_proto_tree = TRUE;
2279 create_proto_tree = FALSE;
2280 /* The protocol tree will be "visible", i.e., printed, only if we're
2281 printing packet details, which is true if we're printing stuff
2282 ("print_packet_info" is true) and we're in verbose mode ("verbose"
2284 edt = epan_dissect_new(create_proto_tree, print_packet_info && verbose);
2286 /* If we're running a read filter, prime the epan_dissect_t with that
2289 epan_dissect_prime_dfilter(edt, cf->rfcode);
2291 tap_queue_init(edt);
2293 /* We only need the columns if we're printing packet info but we're
2294 *not* verbose; in verbose mode, we print the protocol tree, not
2295 the protocol summary. */
2296 epan_dissect_run(edt, pseudo_header, pd, &fdata,
2297 (print_packet_info && !verbose) ? &cf->cinfo : NULL);
2299 tap_push_tapped_queue(edt);
2301 /* Run the read filter if we have one. */
2303 passed = dfilter_apply_edt(cf->rfcode, edt);
2307 /* We're not running a display filter and we're not printing any
2308 packet information, so we don't need to do a dissection, and all
2309 packets are processed. */
2315 /* Process this packet. */
2316 if (print_packet_info) {
2317 /* We're printing packet information; print the information for
2319 print_packet(cf, edt);
2321 /* The ANSI C standard does not appear to *require* that a line-buffered
2322 stream be flushed to the host environment whenever a newline is
2323 written, it just says that, on such a stream, characters "are
2324 intended to be transmitted to or from the host environment as a
2325 block when a new-line character is encountered".
2327 The Visual C++ 6.0 C implementation doesn't do what is intended;
2328 even if you set a stream to be line-buffered, it still doesn't
2329 flush the buffer at the end of every line.
2331 So, if the "-l" flag was specified, we flush the standard output
2332 at the end of a packet. This will do the right thing if we're
2333 printing packet summary lines, and, as we print the entire protocol
2334 tree for a single packet without waiting for anything to happen,
2335 it should be as good as line-buffered mode if we're printing
2336 protocol trees. (The whole reason for the "-l" flag in either
2337 tcpdump or Tethereal is to allow the output of a live capture to
2338 be piped to a program or script and to have that script see the
2339 information for the packet as soon as it's printed, rather than
2340 having to wait until a standard I/O buffer fills up. */
2344 if (ferror(stdout)) {
2345 show_print_file_io_error(errno);
2351 if (do_dissection) {
2352 epan_dissect_free(edt);
2353 clear_fdata(&fdata);
2359 show_capture_file_io_error(const char *fname, int err, gboolean is_close)
2361 char *save_file_string;
2363 save_file_string = output_file_description(fname);
2368 cmdarg_err("Not all the packets could be written to the %s because there is "
2369 "no space left on the file system.",
2375 cmdarg_err("Not all the packets could be written to the %s because you are "
2376 "too close to, or over your disk quota.",
2381 case WTAP_ERR_CANT_CLOSE:
2382 cmdarg_err("The %s couldn't be closed for some unknown reason.",
2386 case WTAP_ERR_SHORT_WRITE:
2387 cmdarg_err("Not all the packets could be written to the %s.",
2393 cmdarg_err("The %s could not be closed: %s.", save_file_string,
2394 wtap_strerror(err));
2396 cmdarg_err("An error occurred while writing to the %s: %s.",
2397 save_file_string, wtap_strerror(err));
2401 g_free(save_file_string);
2405 write_preamble(capture_file *cf)
2407 switch (output_action) {
2410 return print_preamble(print_stream, cf->filename);
2415 write_pdml_preamble(stdout);
2417 write_psml_preamble(stdout);
2418 return !ferror(stdout);
2421 g_assert_not_reached();
2427 get_line_buf(size_t len)
2429 static char *line_bufp = NULL;
2430 static size_t line_buf_len = 256;
2431 size_t new_line_buf_len;
2433 for (new_line_buf_len = line_buf_len; len > new_line_buf_len;
2434 new_line_buf_len *= 2)
2436 if (line_bufp == NULL) {
2437 line_buf_len = new_line_buf_len;
2438 line_bufp = g_malloc(line_buf_len + 1);
2440 if (new_line_buf_len > line_buf_len) {
2441 line_buf_len = new_line_buf_len;
2442 line_bufp = g_realloc(line_bufp, line_buf_len + 1);
2449 print_columns(capture_file *cf)
2456 line_bufp = get_line_buf(256);
2459 for (i = 0; i < cf->cinfo.num_cols; i++) {
2460 switch (cf->cinfo.col_fmt[i]) {
2464 * Don't print this if we're doing a live capture from a network
2465 * interface - if we're doing a live capture, you won't be
2466 * able to look at the capture in the future (it's not being
2467 * saved anywhere), so the frame numbers are unlikely to be
2470 * (XXX - it might be nice to be able to save and print at
2471 * the same time, sort of like an "Update list of packets
2472 * in real time" capture in Ethereal.)
2474 if (capture_opts.iface != NULL)
2477 column_len = strlen(cf->cinfo.col_data[i]);
2480 line_bufp = get_line_buf(buf_offset + column_len);
2481 sprintf(line_bufp + buf_offset, "%3s", cf->cinfo.col_data[i]);
2487 case COL_ABS_DATE_TIME: /* XXX - wider */
2488 column_len = strlen(cf->cinfo.col_data[i]);
2489 if (column_len < 10)
2491 line_bufp = get_line_buf(buf_offset + column_len);
2492 sprintf(line_bufp + buf_offset, "%10s", cf->cinfo.col_data[i]);
2498 case COL_DEF_DL_SRC:
2499 case COL_RES_DL_SRC:
2500 case COL_UNRES_DL_SRC:
2501 case COL_DEF_NET_SRC:
2502 case COL_RES_NET_SRC:
2503 case COL_UNRES_NET_SRC:
2504 column_len = strlen(cf->cinfo.col_data[i]);
2505 if (column_len < 12)
2507 line_bufp = get_line_buf(buf_offset + column_len);
2508 sprintf(line_bufp + buf_offset, "%12s", cf->cinfo.col_data[i]);
2514 case COL_DEF_DL_DST:
2515 case COL_RES_DL_DST:
2516 case COL_UNRES_DL_DST:
2517 case COL_DEF_NET_DST:
2518 case COL_RES_NET_DST:
2519 case COL_UNRES_NET_DST:
2520 column_len = strlen(cf->cinfo.col_data[i]);
2521 if (column_len < 12)
2523 line_bufp = get_line_buf(buf_offset + column_len);
2524 sprintf(line_bufp + buf_offset, "%-12s", cf->cinfo.col_data[i]);
2528 column_len = strlen(cf->cinfo.col_data[i]);
2529 line_bufp = get_line_buf(buf_offset + column_len);
2530 strcat(line_bufp + buf_offset, cf->cinfo.col_data[i]);
2533 buf_offset += column_len;
2534 if (i != cf->cinfo.num_cols - 1) {
2536 * This isn't the last column, so we need to print a
2537 * separator between this column and the next.
2539 * If we printed a network source and are printing a
2540 * network destination of the same type next, separate
2541 * them with "->"; if we printed a network destination
2542 * and are printing a network source of the same type
2543 * next, separate them with "<-"; otherwise separate them
2546 * We add enough space to the buffer for " <- " or " -> ",
2547 * even if we're only adding " ".
2549 line_bufp = get_line_buf(buf_offset + 4);
2550 switch (cf->cinfo.col_fmt[i]) {
2555 switch (cf->cinfo.col_fmt[i + 1]) {
2560 strcat(line_bufp + buf_offset, " -> ");
2565 strcat(line_bufp + buf_offset, " ");
2571 case COL_DEF_DL_SRC:
2572 case COL_RES_DL_SRC:
2573 case COL_UNRES_DL_SRC:
2574 switch (cf->cinfo.col_fmt[i + 1]) {
2576 case COL_DEF_DL_DST:
2577 case COL_RES_DL_DST:
2578 case COL_UNRES_DL_DST:
2579 strcat(line_bufp + buf_offset, " -> ");
2584 strcat(line_bufp + buf_offset, " ");
2590 case COL_DEF_NET_SRC:
2591 case COL_RES_NET_SRC:
2592 case COL_UNRES_NET_SRC:
2593 switch (cf->cinfo.col_fmt[i + 1]) {
2595 case COL_DEF_NET_DST:
2596 case COL_RES_NET_DST:
2597 case COL_UNRES_NET_DST:
2598 strcat(line_bufp + buf_offset, " -> ");
2603 strcat(line_bufp + buf_offset, " ");
2612 switch (cf->cinfo.col_fmt[i + 1]) {
2617 strcat(line_bufp + buf_offset, " <- ");
2622 strcat(line_bufp + buf_offset, " ");
2628 case COL_DEF_DL_DST:
2629 case COL_RES_DL_DST:
2630 case COL_UNRES_DL_DST:
2631 switch (cf->cinfo.col_fmt[i + 1]) {
2633 case COL_DEF_DL_SRC:
2634 case COL_RES_DL_SRC:
2635 case COL_UNRES_DL_SRC:
2636 strcat(line_bufp + buf_offset, " <- ");
2641 strcat(line_bufp + buf_offset, " ");
2647 case COL_DEF_NET_DST:
2648 case COL_RES_NET_DST:
2649 case COL_UNRES_NET_DST:
2650 switch (cf->cinfo.col_fmt[i + 1]) {
2652 case COL_DEF_NET_SRC:
2653 case COL_RES_NET_SRC:
2654 case COL_UNRES_NET_SRC:
2655 strcat(line_bufp + buf_offset, " <- ");
2660 strcat(line_bufp + buf_offset, " ");
2667 strcat(line_bufp + buf_offset, " ");
2673 return print_line(print_stream, 0, line_bufp);
2677 print_packet(capture_file *cf, epan_dissect_t *edt)
2679 print_args_t print_args;
2682 /* Print the information in the protocol tree. */
2683 switch (output_action) {
2686 print_args.to_file = TRUE;
2687 print_args.format = print_format;
2688 print_args.print_summary = !verbose;
2689 print_args.print_hex = verbose && print_hex;
2690 print_args.print_formfeed = FALSE;
2691 print_args.print_dissections = verbose ? print_dissections_expanded : print_dissections_none;
2693 /* init the packet range */
2694 packet_range_init(&print_args.range);
2696 if (!proto_tree_print(&print_args, edt, print_stream))
2699 /* "print_hex_data()" will put out a leading blank line, as well
2700 as a trailing one; print one here, to separate the packets,
2701 only if "print_hex_data()" won't be called. */
2702 if (!print_line(print_stream, 0, ""))
2708 proto_tree_write_pdml(edt, stdout);
2710 return !ferror(stdout);
2713 /* Just fill in the columns. */
2714 epan_dissect_fill_in_columns(edt);
2716 /* Now print them. */
2717 switch (output_action) {
2720 if (!print_columns(cf))
2725 proto_tree_write_psml(edt, stdout);
2726 return !ferror(stdout);
2730 if (!print_hex_data(print_stream, edt))
2732 if (!print_line(print_stream, 0, ""))
2741 switch (output_action) {
2744 return print_finale(print_stream);
2749 write_pdml_finale(stdout);
2751 write_psml_finale(stdout);
2752 return !ferror(stdout);
2755 g_assert_not_reached();
2761 show_print_file_io_error(int err)
2766 cmdarg_err("Not all the packets could be printed because there is "
2767 "no space left on the file system.");
2772 cmdarg_err("Not all the packets could be printed because you are "
2773 "too close to, or over your disk quota.");
2778 cmdarg_err("An error occurred while printing packets: %s.",
2785 cf_open_error_message(int err, gchar *err_info, gboolean for_writing,
2789 static char errmsg_errno[1024+1];
2792 /* Wiretap error. */
2795 case WTAP_ERR_NOT_REGULAR_FILE:
2796 errmsg = "The file \"%s\" is a \"special file\" or socket or other non-regular file.";
2799 case WTAP_ERR_FILE_UNKNOWN_FORMAT:
2800 /* Seen only when opening a capture file for reading. */
2801 errmsg = "The file \"%s\" isn't a capture file in a format Tethereal understands.";
2804 case WTAP_ERR_UNSUPPORTED:
2805 /* Seen only when opening a capture file for reading. */
2806 g_snprintf(errmsg_errno, sizeof(errmsg_errno),
2807 "The file \"%%s\" isn't a capture file in a format Tethereal understands.\n"
2810 errmsg = errmsg_errno;
2813 case WTAP_ERR_CANT_WRITE_TO_PIPE:
2814 /* Seen only when opening a capture file for writing. */
2815 g_snprintf(errmsg_errno, sizeof(errmsg_errno),
2816 "The file \"%%s\" is a pipe, and %s capture files can't be "
2817 "written to a pipe.", wtap_file_type_string(file_type));
2818 errmsg = errmsg_errno;
2821 case WTAP_ERR_UNSUPPORTED_FILE_TYPE:
2822 /* Seen only when opening a capture file for writing. */
2823 errmsg = "Tethereal doesn't support writing capture files in that format.";
2826 case WTAP_ERR_UNSUPPORTED_ENCAP:
2828 errmsg = "Tethereal can't save this capture in that format.";
2830 g_snprintf(errmsg_errno, sizeof(errmsg_errno),
2831 "The file \"%%s\" is a capture for a network type that Tethereal doesn't support.\n"
2834 errmsg = errmsg_errno;
2838 case WTAP_ERR_ENCAP_PER_PACKET_UNSUPPORTED:
2840 errmsg = "Tethereal can't save this capture in that format.";
2842 errmsg = "The file \"%s\" is a capture for a network type that Tethereal doesn't support.";
2845 case WTAP_ERR_BAD_RECORD:
2846 /* Seen only when opening a capture file for reading. */
2847 g_snprintf(errmsg_errno, sizeof(errmsg_errno),
2848 "The file \"%%s\" appears to be damaged or corrupt.\n"
2851 errmsg = errmsg_errno;
2854 case WTAP_ERR_CANT_OPEN:
2856 errmsg = "The file \"%s\" could not be created for some unknown reason.";
2858 errmsg = "The file \"%s\" could not be opened for some unknown reason.";
2861 case WTAP_ERR_SHORT_READ:
2862 errmsg = "The file \"%s\" appears to have been cut short"
2863 " in the middle of a packet or other data.";
2866 case WTAP_ERR_SHORT_WRITE:
2867 errmsg = "A full header couldn't be written to the file \"%s\".";
2871 g_snprintf(errmsg_errno, sizeof(errmsg_errno),
2872 "The file \"%%s\" could not be %s: %s.",
2873 for_writing ? "created" : "opened",
2874 wtap_strerror(err));
2875 errmsg = errmsg_errno;
2879 errmsg = file_open_error_message(err, for_writing);
2884 * Open/create errors are reported with an console message in Tethereal.
2887 open_failure_message(const char *filename, int err, gboolean for_writing)
2889 fprintf(stderr, "tethereal: ");
2890 fprintf(stderr, file_open_error_message(err, for_writing), filename);
2891 fprintf(stderr, "\n");
2895 cf_open(capture_file *cf, const char *fname, gboolean is_tempfile, int *err)
2899 char err_msg[2048+1];
2901 wth = wtap_open_offline(fname, err, &err_info, FALSE);
2905 /* The open succeeded. Fill in the information for this file. */
2907 /* Initialize all data structures used for dissection. */
2911 cf->f_datalen = 0; /* not used, but set it anyway */
2913 /* Set the file name because we need it to set the follow stream filter.
2914 XXX - is that still true? We need it for other reasons, though,
2916 cf->filename = g_strdup(fname);
2918 /* Indicate whether it's a permanent or temporary file. */
2919 cf->is_tempfile = is_tempfile;
2921 /* If it's a temporary capture buffer file, mark it as not saved. */
2922 cf->user_saved = !is_tempfile;
2924 cf->cd_t = wtap_file_type(cf->wth);
2926 cf->drops_known = FALSE;
2928 cf->snap = wtap_snapshot_length(cf->wth);
2929 if (cf->snap == 0) {
2930 /* Snapshot length not known. */
2931 cf->has_snap = FALSE;
2932 cf->snap = WTAP_MAX_PACKET_SIZE;
2934 cf->has_snap = TRUE;
2935 nstime_set_zero(&cf->elapsed_time);
2936 nstime_set_zero(&first_ts);
2937 nstime_set_zero(&prev_ts);
2942 g_snprintf(err_msg, sizeof err_msg,
2943 cf_open_error_message(*err, err_info, FALSE, cf->cd_t), fname);
2944 cmdarg_err("%s", err_msg);
2950 * General errors are reported with an console message in Tethereal.
2953 failure_message(const char *msg_format, va_list ap)
2955 fprintf(stderr, "tethereal: ");
2956 vfprintf(stderr, msg_format, ap);
2957 fprintf(stderr, "\n");
2961 * Read errors are reported with an console message in Tethereal.
2964 read_failure_message(const char *filename, int err)
2966 cmdarg_err("An error occurred while reading from the file \"%s\": %s.",
2967 filename, strerror(err));
2971 * Report an error in command-line arguments.
2974 cmdarg_err(const char *fmt, ...)
2979 fprintf(stderr, "tethereal: ");
2980 vfprintf(stderr, fmt, ap);
2981 fprintf(stderr, "\n");
2986 * Report additional information for an error in command-line arguments.
2989 cmdarg_err_cont(const char *fmt, ...)
2994 vfprintf(stderr, fmt, ap);
2995 fprintf(stderr, "\n");
3000 /****************************************************************************************************************/
3001 /* indication report "dummies", needed for capture_loop.c */
3005 /** Report a new capture file having been opened. */
3007 report_new_capture_file(const char *filename)
3009 /* shouldn't happen */
3010 g_assert_not_reached();
3013 /** Report a number of new packets captured. */
3015 report_packet_count(int packet_count)
3017 /* shouldn't happen */
3018 g_assert_not_reached();
3021 /** Report the packet drops once the capture finishes. */
3023 report_packet_drops(int drops)
3025 /* shouldn't happen */
3026 g_assert_not_reached();
3029 /** Report an error in the capture. */
3031 report_capture_error(const char *errmsg, const char *secondary_error_msg)
3034 cmdarg_err_cont(secondary_error_msg);
3037 /** Report an error with a capture filter. */
3039 report_cfilter_error(const char *cfilter, const char *errmsg)
3043 "Invalid capture filter: \"%s\"!\n"
3045 "That string isn't a valid capture filter (%s).\n"
3046 "See the User's Guide for a description of the capture filter syntax.",
3050 #endif /* HAVE_LIBPCAP */
3053 /****************************************************************************************************************/
3054 /* signal pipe "dummies", needed for capture_loop.c */
3060 signal_pipe_check_running(void)
3062 /* currently, no check required */
3067 #endif /* HAVE_LIBPCAP */