3 * $Id: tethereal.c,v 1.210 2003/12/11 01:13:32 guy Exp $
5 * Ethereal - Network traffic analyzer
6 * By Gerald Combs <gerald@ethereal.com>
7 * Copyright 1998 Gerald Combs
9 * Text-mode variant, by Gilbert Ramirez <gram@alumni.rice.edu>
10 * and Guy Harris <guy@alum.mit.edu>.
12 * This program is free software; you can redistribute it and/or
13 * modify it under the terms of the GNU General Public License
14 * as published by the Free Software Foundation; either version 2
15 * of the License, or (at your option) any later version.
17 * This program is distributed in the hope that it will be useful,
18 * but WITHOUT ANY WARRANTY; without even the implied warranty of
19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
20 * GNU General Public License for more details.
22 * You should have received a copy of the GNU General Public License
23 * along with this program; if not, write to the Free Software
24 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
55 #ifdef HAVE_SYS_STAT_H
56 # include <sys/stat.h>
59 #ifdef NEED_SNPRINTF_H
60 # include "snprintf.h"
63 #ifdef NEED_STRERROR_H
72 #include <epan/epan.h>
73 #include <epan/filesystem.h>
76 #include <epan/timestamp.h>
77 #include <epan/packet.h>
79 #include "disabled_protos.h"
83 #include <epan/resolv.h>
86 #include "pcap-util.h"
88 #include <epan/conversation.h>
89 #include <epan/plugins.h>
91 #include "conditions.h"
92 #include "capture_stop_conditions.h"
93 #include "ringbuffer.h"
94 #include <epan/epan_dissect.h>
98 #include <wiretap/wtap-capture.h>
99 #include <wiretap/libpcap.h>
103 #include "capture-wpcap.h"
107 * This is the template for the decode as option; it is shared between the
108 * various functions that output the usage for this parameter.
110 static const gchar decode_as_arg_template[] = "<layer_type>==<selector>,<decode_as_protocol>";
111 static guint32 firstsec, firstusec;
112 static guint32 prevsec, prevusec;
113 static GString *comp_info_str, *runtime_info_str;
114 static gboolean quiet;
115 static gboolean decode;
116 static gboolean verbose;
117 static gboolean print_hex;
118 static gboolean line_buffered;
119 static guint32 cul_bytes = 0;
120 static int print_format;
123 typedef struct _loop_data {
124 gboolean go; /* TRUE as long as we're supposed to keep capturing */
126 gboolean from_pipe; /* TRUE if we are capturing data from a pipe */
130 gboolean output_to_pipe;
133 gboolean modified; /* TRUE if data in the pipe uses modified pcap headers */
134 gboolean byte_swapped; /* TRUE if data in the pipe is byte swapped */
135 unsigned int bytes_to_read, bytes_read; /* Used by pipe_dispatch */
137 STATE_EXPECT_REC_HDR, STATE_READ_REC_HDR,
138 STATE_EXPECT_DATA, STATE_READ_DATA
141 enum { PIPOK, PIPEOF, PIPERR, PIPNEXIST } pipe_err;
147 static int capture(int);
148 static void capture_pcap_cb(guchar *, const struct pcap_pkthdr *,
150 static void report_counts(void);
152 static BOOL WINAPI capture_cleanup(DWORD);
154 static void capture_cleanup(int);
156 static void report_counts_siginfo(int);
159 #endif /* HAVE_LIBPCAP */
166 static int load_cap_file(capture_file *, int);
167 static void wtap_dispatch_cb_write(guchar *, const struct wtap_pkthdr *, long,
168 union wtap_pseudo_header *, const guchar *);
169 static void show_capture_file_io_error(const char *, int, gboolean);
170 static void wtap_dispatch_cb_print(guchar *, const struct wtap_pkthdr *, long,
171 union wtap_pseudo_header *, const guchar *);
174 static void adjust_header(loop_data *, struct pcap_hdr *, struct pcaprec_hdr *);
175 static int pipe_open_live(char *, struct pcap_hdr *, loop_data *, char *, int);
176 static int pipe_dispatch(int, loop_data *, struct pcap_hdr *, \
177 struct pcaprec_modified_hdr *, guchar *, char *, int);
182 ts_type timestamp_type = RELATIVE;
185 int snaplen; /* Maximum captured packet length */
186 int promisc_mode; /* Capture in promiscuous mode */
187 int autostop_count; /* Maximum packet count */
188 gboolean has_autostop_duration; /* TRUE if maximum capture duration
190 gint32 autostop_duration; /* Maximum capture duration */
191 gboolean has_autostop_filesize; /* TRUE if maximum capture file size
193 gint32 autostop_filesize; /* Maximum capture file size */
194 gboolean ringbuffer_on; /* TRUE if ring buffer in use */
195 guint32 ringbuffer_num_files; /* Number of ring buffer files */
196 gboolean has_ring_duration; /* TRUE if ring duration specified */
197 gint32 ringbuffer_duration; /* Switch file after n seconds */
198 int linktype; /* Data link type to use, or -1 for
202 static capture_options capture_opts = {
203 WTAP_MAX_PACKET_SIZE, /* snapshot length - default is
204 infinite, in effect */
205 TRUE, /* promiscuous mode is the default */
206 0, /* max packet count - default is 0,
208 FALSE, /* maximum capture duration not
209 specified by default */
210 0, /* maximum capture duration */
211 FALSE, /* maximum capture file size not
212 specified by default */
213 0, /* maximum capture file size */
214 FALSE, /* ring buffer off by default */
215 RINGBUFFER_MIN_NUM_FILES, /* default number of ring buffer
217 FALSE, /* Switch ring file after some */
218 0, /* specified time is off by default */
219 -1 /* Default to not change link type */
222 static gboolean list_link_layer_types;
225 static gboolean infodelay; /* if TRUE, don't print capture info in SIGINFO handler */
226 static gboolean infoprint; /* if TRUE, print capture info after clearing infodelay */
228 #endif /* HAVE_LIBPCAP */
231 print_usage(gboolean print_ver)
236 fprintf(stderr, "This is GNU t%s %s\n%s\n%s\n", PACKAGE, VERSION,
237 comp_info_str->str, runtime_info_str->str);
240 fprintf(stderr, "\nt%s [ -vh ] [ -DlLnpqSVx ] [ -a <capture autostop condition> ] ...\n",
242 fprintf(stderr, "\t[ -b <number of ring buffer files>[:<duration>] ] [ -c <count> ]\n");
243 fprintf(stderr, "\t[ -d %s ] ...\n", decode_as_arg_template);
244 fprintf(stderr, "\t[ -f <capture filter> ] [ -F <output file type> ] [ -i <interface> ]\n");
245 fprintf(stderr, "\t[ -N <resolving> ] [ -o <preference setting> ] ... [ -r <infile> ]\n");
246 fprintf(stderr, "\t[ -R <read filter> ] [ -s <snaplen> ] [ -t <time stamp format> ]\n");
247 fprintf(stderr, "\t[ -T pdml|ps|text ] [ -w <savefile> ] [ -y <link type> ]\n");
248 fprintf(stderr, "\t[ -z <statistics string> ]\n");
250 fprintf(stderr, "\nt%s [ -vh ] [ -lnVx ]\n", PACKAGE);
251 fprintf(stderr, "\t[ -d %s ] ...\n", decode_as_arg_template);
252 fprintf(stderr, "\t[ -F <output file type> ] [ -N <resolving> ]\n");
253 fprintf(stderr, "\t[ -o <preference setting> ] ... [ -r <infile> ] [ -R <read filter> ]\n");
254 fprintf(stderr, "\t[ -t <time stamp format> ] [ -T pdml|ps|text ] [ -w <savefile> ]\n");
255 fprintf(stderr, "\t[ -z <statistics string> ]\n");
257 fprintf(stderr, "Valid file type arguments to the \"-F\" flag:\n");
258 for (i = 0; i < WTAP_NUM_FILE_TYPES; i++) {
259 if (wtap_dump_can_open(i))
260 fprintf(stderr, "\t%s - %s\n",
261 wtap_file_type_short_string(i), wtap_file_type_string(i));
263 fprintf(stderr, "\tdefault is libpcap\n");
268 get_natural_int(const char *string, const char *name)
273 number = strtol(string, &p, 10);
274 if (p == string || *p != '\0') {
275 fprintf(stderr, "tethereal: The specified %s \"%s\" is not a decimal number\n",
280 fprintf(stderr, "tethereal: The specified %s is a negative number\n",
284 if (number > INT_MAX) {
285 fprintf(stderr, "tethereal: The specified %s is too large (greater than %d)\n",
293 get_positive_int(const char *string, const char *name)
297 number = get_natural_int(string, name);
300 fprintf(stderr, "tethereal: The specified %s is zero\n",
309 * Given a string of the form "<autostop criterion>:<value>", as might appear
310 * as an argument to a "-a" option, parse it and set the criterion in
311 * question. Return an indication of whether it succeeded or failed
315 set_autostop_criterion(const char *autostoparg)
319 colonp = strchr(autostoparg, ':');
327 * Skip over any white space (there probably won't be any, but
328 * as we allow it in the preferences file, we might as well
335 * Put the colon back, so if our caller uses, in an
336 * error message, the string they passed us, the message
342 if (strcmp(autostoparg,"duration") == 0) {
343 capture_opts.has_autostop_duration = TRUE;
344 capture_opts.autostop_duration = get_positive_int(p,"autostop duration");
345 } else if (strcmp(autostoparg,"filesize") == 0) {
346 capture_opts.has_autostop_filesize = TRUE;
347 capture_opts.autostop_filesize = get_positive_int(p,"autostop filesize");
351 *colonp = ':'; /* put the colon back */
356 * Given a string of the form "<ring buffer file>:<duration>", as might appear
357 * as an argument to a "-b" option, parse it and set the arguments in
358 * question. Return an indication of whether it succeeded or failed
362 get_ring_arguments(const char *arg)
364 guchar *p = NULL, *colonp;
366 colonp = strchr(arg, ':');
368 if (colonp != NULL) {
373 capture_opts.ringbuffer_num_files =
374 get_natural_int(arg, "number of ring buffer files");
380 * Skip over any white space (there probably won't be any, but
381 * as we allow it in the preferences file, we might as well
388 * Put the colon back, so if our caller uses, in an
389 * error message, the string they passed us, the message
396 capture_opts.has_ring_duration = TRUE;
397 capture_opts.ringbuffer_duration = get_positive_int(p,
398 "ring buffer duration");
400 *colonp = ':'; /* put the colon back */
405 /* structure to keep track of what tap listeners have been registered.
407 typedef struct _ethereal_tap_list {
408 struct _ethereal_tap_list *next;
410 void (*func)(char *arg);
412 static ethereal_tap_list *tap_list=NULL;
415 register_ethereal_tap(char *cmd, void (*func)(char *arg))
417 ethereal_tap_list *newtl;
419 newtl=malloc(sizeof(ethereal_tap_list));
420 newtl->next=tap_list;
428 * For a dissector table, print on the stream described by output,
429 * its short name (which is what's used in the "-d" option) and its
433 display_dissector_table_names(char *table_name, char *ui_name, gpointer output)
435 fprintf((FILE *)output, "\t%s (%s)\n", table_name, ui_name);
439 * For a dissector handle, print on the stream described by output,
440 * the filter name (which is what's used in the "-d" option) and the full
441 * name for the protocol that corresponds to this handle.
444 display_dissector_names(gchar *table _U_, gpointer handle, gpointer output)
447 const gchar* proto_filter_name;
448 const gchar* proto_ui_name;
450 proto_id = dissector_handle_get_protocol_index((dissector_handle_t)handle);
452 if (proto_id != -1) {
453 proto_filter_name = proto_get_protocol_filter_name(proto_id);
454 proto_ui_name = proto_get_protocol_name(proto_id);
455 g_assert(proto_filter_name != NULL);
456 g_assert(proto_ui_name != NULL);
458 fprintf((FILE *)output, "\t%s (%s)\n",
465 * The protocol_name_search structure is used by find_protocol_name_func()
466 * to pass parameters and store results
468 struct protocol_name_search{
469 gchar *searched_name; /* Protocol filter name we are looking for */
470 dissector_handle_t matched_handle; /* Handle for a dissector whose protocol has the specified filter name */
471 guint nb_match; /* How many dissectors matched searched_name */
473 typedef struct protocol_name_search *protocol_name_search_t;
476 * This function parses all dissectors associated with a table to find the
477 * one whose protocol has the specified filter name. It is called
478 * as a reference function in a call to dissector_table_foreach_handle.
479 * The name we are looking for, as well as the results, are stored in the
480 * protocol_name_search struct pointed to by user_data.
481 * If called using dissector_table_foreach_handle, we actually parse the
482 * whole list of dissectors.
485 find_protocol_name_func(gchar *table _U_, gpointer handle, gpointer user_data)
489 const gchar *protocol_filter_name;
490 protocol_name_search_t search_info;
494 search_info = (protocol_name_search_t)user_data;
496 proto_id = dissector_handle_get_protocol_index((dissector_handle_t)handle);
497 if (proto_id != -1) {
498 protocol_filter_name = proto_get_protocol_filter_name(proto_id);
499 g_assert(protocol_filter_name != NULL);
500 if (strcmp(protocol_filter_name, search_info->searched_name) == 0) {
502 if (search_info->nb_match == 0) {
503 /* Record this handle only if this is the first match */
504 search_info->matched_handle = (dissector_handle_t)handle; /* Record the handle for this matching dissector */
506 search_info->nb_match++;
512 * Print all layer type names supported.
513 * We send the output to the stream described by the handle output.
517 fprint_all_layer_types(FILE *output)
520 dissector_all_tables_foreach_table(display_dissector_table_names, (gpointer)output);
524 * Print all protocol names supported for a specific layer type.
525 * table_name contains the layer type name in which the search is performed.
526 * We send the output to the stream described by the handle output.
530 fprint_all_protocols_for_layer_types(FILE *output, gchar *table_name)
533 dissector_table_foreach_handle(table_name,
534 display_dissector_names,
539 * The function below parses the command-line parameters for the decode as
540 * feature (a string pointer by cl_param).
541 * It checks the format of the command-line, searches for a matching table
542 * and dissector. If a table/dissector match is not found, we display a
543 * summary of the available tables/dissectors (on stderr) and return FALSE.
544 * If everything is fine, we get the "Decode as" preference activated,
545 * then we return TRUE.
548 add_decode_as(const gchar *cl_param)
552 gchar *decoded_param;
553 gchar *remaining_param;
555 gchar *dissector_str;
556 dissector_handle_t dissector_matching;
557 dissector_table_t table_matching;
558 ftenum_t dissector_table_selector_type;
559 struct protocol_name_search user_protocol_name;
561 /* The following code will allocate and copy the command-line options in a string pointed by decoded_param */
564 decoded_param = g_malloc( sizeof(gchar) * (strlen(cl_param) + 1) ); /* Allocate enough space to have a working copy of the command-line parameter */
565 g_assert(decoded_param);
566 strcpy(decoded_param, cl_param);
569 /* The lines below will parse this string (modifying it) to extract all
570 necessary information. Note that decoded_param is still needed since
571 strings are not copied - we just save pointers. */
573 /* This section extracts a layer type (table_name) from decoded_param */
574 table_name = decoded_param; /* Layer type string starts from beginning */
576 remaining_param = strchr(table_name, '=');
577 if (remaining_param == NULL) {
578 fprintf(stderr, "tethereal: Parameter \"%s\" doesn't follow the template \"%s\"\n", cl_param, decode_as_arg_template);
579 /* If the argument does not follow the template, carry on anyway to check
580 if the table name is at least correct. If remaining_param is NULL,
581 we'll exit anyway further down */
584 *remaining_param = '\0'; /* Terminate the layer type string (table_name) where '=' was detected */
587 /* Remove leading and trailing spaces from the table name */
588 while ( table_name[0] == ' ' )
590 while ( table_name[strlen(table_name) - 1] == ' ' )
591 table_name[strlen(table_name) - 1] = '\0'; /* Note: if empty string, while loop will eventually exit */
593 /* The following part searches a table matching with the layer type specified */
594 table_matching = NULL;
596 /* Look for the requested table */
597 if ( !(*(table_name)) ) { /* Is the table name empty, if so, don't even search for anything, display a message */
598 fprintf(stderr, "tethereal: No layer type specified\n"); /* Note, we don't exit here, but table_matching will remain NULL, so we exit below */
601 table_matching = find_dissector_table(table_name);
602 if (!table_matching) {
603 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 */
607 if (!table_matching) {
608 /* Display a list of supported layer types to help the user, if the
609 specified layer type was not found */
610 fprintf(stderr, "tethereal: Valid layer types are:\n");
611 fprint_all_layer_types(stderr);
613 if (remaining_param == NULL || !table_matching) {
614 /* Exit if the layer type was not found, or if no '=' separator was found
616 g_free(decoded_param);
620 if (*(remaining_param + 1) != '=') { /* Check for "==" and not only '=' */
621 fprintf(stderr, "tethereal: WARNING: -d requires \"==\" instead of \"=\". Option will be treated as \"%s==%s\"\n", table_name, remaining_param + 1);
624 remaining_param++; /* Move to the second '=' */
625 *remaining_param = '\0'; /* Remove the second '=' */
627 remaining_param++; /* Position after the layer type string */
629 /* This section extracts a selector value (selector_str) from decoded_param */
631 selector_str = remaining_param; /* Next part starts with the selector number */
633 remaining_param = strchr(selector_str, ',');
634 if (remaining_param == NULL) {
635 fprintf(stderr, "tethereal: Parameter \"%s\" doesn't follow the template \"%s\"\n", cl_param, decode_as_arg_template);
636 /* If the argument does not follow the template, carry on anyway to check
637 if the selector value is at least correct. If remaining_param is NULL,
638 we'll exit anyway further down */
641 *remaining_param = '\0'; /* Terminate the selector number string (selector_str) where ',' was detected */
644 dissector_table_selector_type = get_dissector_table_selector_type(table_name);
646 switch (dissector_table_selector_type) {
652 /* The selector for this table is an unsigned number. Parse it as such.
653 There's no need to remove leading and trailing spaces from the
654 selector number string, because sscanf will do that for us. */
655 if ( sscanf(selector_str, "%u", &selector) != 1 ) {
656 fprintf(stderr, "tethereal: Invalid selector number \"%s\"\n", selector_str);
657 g_free(decoded_param);
664 /* The selector for this table is a string. */
668 /* There are currently no dissector tables with any types other
669 than the ones listed above. */
670 g_assert_not_reached();
673 if (remaining_param == NULL) {
674 /* Exit if no ',' separator was found (see above) */
675 fprintf(stderr, "tethereal: Valid protocols for layer type \"%s\" are:\n", table_name);
676 fprint_all_protocols_for_layer_types(stderr, table_name);
677 g_free(decoded_param);
681 remaining_param++; /* Position after the selector number string */
683 /* This section extracts a protocol filter name (dissector_str) from decoded_param */
685 dissector_str = remaining_param; /* All the rest of the string is the dissector (decode as protocol) name */
687 /* Remove leading and trailing spaces from the dissector name */
688 while ( dissector_str[0] == ' ' )
690 while ( dissector_str[strlen(dissector_str) - 1] == ' ' )
691 dissector_str[strlen(dissector_str) - 1] = '\0'; /* Note: if empty string, while loop will eventually exit */
693 dissector_matching = NULL;
695 /* We now have a pointer to the handle for the requested table inside the variable table_matching */
696 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 */
697 fprintf(stderr, "tethereal: No protocol name specified\n"); /* Note, we don't exit here, but dissector_matching will remain NULL, so we exit below */
700 user_protocol_name.nb_match = 0;
701 user_protocol_name.searched_name = dissector_str;
702 user_protocol_name.matched_handle = NULL;
704 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 */
706 if (user_protocol_name.nb_match != 0) {
707 dissector_matching = user_protocol_name.matched_handle;
708 if (user_protocol_name.nb_match > 1) {
709 fprintf(stderr, "tethereal: WARNING: Protocol \"%s\" matched %u dissectors, first one will be used\n", dissector_str, user_protocol_name.nb_match);
713 /* OK, check whether the problem is that there isn't any such
714 protocol, or that there is but it's not specified as a protocol
715 that's valid for that dissector table.
716 Note, we don't exit here, but dissector_matching will remain NULL,
718 if (proto_get_id_by_filter_name(dissector_str) == -1) {
719 /* No such protocol */
720 fprintf(stderr, "tethereal: Unknown protocol -- \"%s\"\n", dissector_str);
722 fprintf(stderr, "tethereal: Protocol \"%s\" isn't valid for layer type \"%s\"\n",
723 dissector_str, table_name);
728 if (!dissector_matching) {
729 fprintf(stderr, "tethereal: Valid protocols for layer type \"%s\" are:\n", table_name);
730 fprint_all_protocols_for_layer_types(stderr, table_name);
731 g_free(decoded_param);
735 /* This is the end of the code that parses the command-line options.
736 All information is now stored in the variables:
740 The above variables that are strings are still pointing to areas within
741 decoded_parm. decoded_parm thus still needs to be kept allocated in
742 until we stop needing these variables
743 decoded_param will be deallocated at each exit point of this function */
746 /* We now have a pointer to the handle for the requested dissector
747 (requested protocol) inside the variable dissector_matching */
748 switch (dissector_table_selector_type) {
754 /* The selector for this table is an unsigned number. */
755 dissector_change(table_name, selector, dissector_matching);
760 /* The selector for this table is a string. */
761 dissector_change_string(table_name, selector_str, dissector_matching);
765 /* There are currently no dissector tables with any types other
766 than the ones listed above. */
767 g_assert_not_reached();
769 g_free(decoded_param); /* "Decode As" rule has been succesfully added */
774 main(int argc, char *argv[])
778 gboolean arg_error = FALSE;
784 char *gpf_path, *pf_path;
786 int gpf_open_errno, gpf_read_errno;
787 int pf_open_errno, pf_read_errno;
788 int dp_open_errno, dp_read_errno;
791 gboolean capture_filter_specified = FALSE;
792 GList *if_list, *if_entry;
796 gchar err_str[PCAP_ERRBUF_SIZE];
798 gboolean capture_option_specified = FALSE;
800 int out_file_type = WTAP_FILE_PCAP;
801 gchar *cf_name = NULL, *rfilter = NULL;
804 GList *lt_list, *lt_entry;
805 data_link_info_t *data_link_info;
807 #ifdef HAVE_PCAP_COMPILE_NOPCAP
808 struct bpf_program fcode;
810 dfilter_t *rfcode = NULL;
813 ethereal_tap_list *tli;
815 /* Register all dissectors; we must do this before checking for the
816 "-G" flag, as the "-G" flag dumps information registered by the
817 dissectors, and we must do it before we read the preferences, in
818 case any dissectors register preferences. */
819 epan_init(PLUGIN_DIR,register_all_protocols,register_all_protocol_handoffs);
821 /* Register all tap listeners; we do this before we parse the arguments,
822 as the "-z" argument can specify a registered tap. */
823 register_all_tap_listeners();
825 /* Now register the preferences for any non-dissector modules.
826 We must do that before we read the preferences as well. */
827 prefs_register_modules();
829 /* If invoked with the "-G" flag, we dump out information based on
830 the argument to the "-G" flag; if no argument is specified,
831 for backwards compatibility we dump out a glossary of display
834 We do this here to mirror what happens in the GTK+ version, although
835 it's not necessary here. */
836 if (argc >= 2 && strcmp(argv[1], "-G") == 0) {
838 proto_registrar_dump_fields();
840 if (strcmp(argv[2], "fields") == 0)
841 proto_registrar_dump_fields();
842 else if (strcmp(argv[2], "protocols") == 0)
843 proto_registrar_dump_protocols();
845 fprintf(stderr, "tethereal: Invalid \"%s\" option for -G flag\n",
853 /* Set the C-language locale to the native environment. */
854 setlocale(LC_ALL, "");
856 prefs = read_prefs(&gpf_open_errno, &gpf_read_errno, &gpf_path,
857 &pf_open_errno, &pf_read_errno, &pf_path);
858 if (gpf_path != NULL) {
859 if (gpf_open_errno != 0) {
860 fprintf(stderr, "Can't open global preferences file \"%s\": %s.\n",
861 pf_path, strerror(gpf_open_errno));
863 if (gpf_read_errno != 0) {
864 fprintf(stderr, "I/O error reading global preferences file \"%s\": %s.\n",
865 pf_path, strerror(gpf_read_errno));
868 if (pf_path != NULL) {
869 if (pf_open_errno != 0) {
870 fprintf(stderr, "Can't open your preferences file \"%s\": %s.\n", pf_path,
871 strerror(pf_open_errno));
873 if (pf_read_errno != 0) {
874 fprintf(stderr, "I/O error reading your preferences file \"%s\": %s.\n",
875 pf_path, strerror(pf_read_errno));
881 /* Set the name resolution code's flags from the preferences. */
882 g_resolv_flags = prefs->name_resolve;
884 /* Read the disabled protocols file. */
885 read_disabled_protos_list(&dp_path, &dp_open_errno, &dp_read_errno);
886 if (dp_path != NULL) {
887 if (dp_open_errno != 0) {
889 "Could not open your disabled protocols file\n\"%s\": %s.\n", dp_path,
890 strerror(dp_open_errno));
892 if (dp_read_errno != 0) {
894 "I/O error reading your disabled protocols file\n\"%s\": %s.\n", dp_path,
895 strerror(dp_read_errno));
901 /* Load Wpcap, if possible */
905 init_cap_file(&cfile);
907 /* Assemble the compile-time version information string */
908 comp_info_str = g_string_new("Compiled ");
909 get_compiled_version_info(comp_info_str);
911 /* Assemble the run-time version information string */
912 runtime_info_str = g_string_new("Running ");
913 get_runtime_version_info(runtime_info_str);
915 /* Print format defaults to this. */
916 print_format = PR_FMT_TEXT;
918 /* Now get our args */
919 while ((opt = getopt(argc, argv, "a:b:c:d:Df:F:hi:lLnN:o:pqr:R:s:St:T:vw:Vxy:z:")) != -1) {
921 case 'a': /* autostop criteria */
923 if (set_autostop_criterion(optarg) == FALSE) {
924 fprintf(stderr, "tethereal: Invalid or unknown -a flag \"%s\"\n", optarg);
928 capture_option_specified = TRUE;
932 case 'b': /* Ringbuffer option */
934 capture_opts.ringbuffer_on = TRUE;
935 if (get_ring_arguments(optarg) == FALSE) {
936 fprintf(stderr, "tethereal: Invalid or unknown -b arg \"%s\"\n", optarg);
940 capture_option_specified = TRUE;
944 case 'c': /* Capture xxx packets */
946 capture_opts.autostop_count =
947 get_positive_int(optarg, "packet count");
949 capture_option_specified = TRUE;
953 case 'd': /* Decode as rule */
954 if (!add_decode_as(optarg))
957 case 'D': /* Print a list of capture devices */
959 if_list = get_interface_list(&err, err_str);
960 if (if_list == NULL) {
963 case CANT_GET_INTERFACE_LIST:
964 fprintf(stderr, "tethereal: Can't get list of interfaces: %s\n",
968 case NO_INTERFACES_FOUND:
969 fprintf(stderr, "tethereal: There are no interfaces on which a capture can be done\n");
974 i = 1; /* Interface id number */
975 for (if_entry = g_list_first(if_list); if_entry != NULL;
976 if_entry = g_list_next(if_entry)) {
977 if_info = if_entry->data;
978 printf("%d. %s", i++, if_info->name);
979 if (if_info->description != NULL)
980 printf(" (%s)", if_info->description);
983 free_interface_list(if_list);
986 capture_option_specified = TRUE;
992 capture_filter_specified = TRUE;
994 g_free(cfile.cfilter);
995 cfile.cfilter = g_strdup(optarg);
997 capture_option_specified = TRUE;
1002 out_file_type = wtap_short_string_to_file_type(optarg);
1003 if (out_file_type < 0) {
1004 fprintf(stderr, "tethereal: \"%s\" is not a valid capture file type\n",
1009 case 'h': /* Print help and exit */
1013 case 'i': /* Use interface xxx */
1016 * If the argument is a number, treat it as an index into the list
1017 * of adapters, as printed by "tethereal -D".
1019 * This should be OK on UNIX systems, as interfaces shouldn't have
1020 * names that begin with digits. It can be useful on Windows, where
1021 * more than one interface can have the same name.
1023 adapter_index = strtol(optarg, &p, 10);
1024 if (p != NULL && *p == '\0') {
1025 if (adapter_index < 0) {
1027 "tethereal: The specified adapter index is a negative number\n");
1030 if (adapter_index > INT_MAX) {
1032 "tethereal: The specified adapter index is too large (greater than %d)\n",
1036 if (adapter_index == 0) {
1037 fprintf(stderr, "tethereal: there is no interface with that adapter index\n");
1040 if_list = get_interface_list(&err, err_str);
1041 if (if_list == NULL) {
1044 case CANT_GET_INTERFACE_LIST:
1045 fprintf(stderr, "tethereal: Can't get list of interfaces: %s\n",
1049 case NO_INTERFACES_FOUND:
1050 fprintf(stderr, "tethereal: There are no interfaces on which a capture can be done\n");
1055 if_info = g_list_nth_data(if_list, adapter_index - 1);
1056 if (if_info == NULL) {
1057 fprintf(stderr, "tethereal: there is no interface with that adapter index\n");
1060 cfile.iface = g_strdup(if_info->name);
1061 free_interface_list(if_list);
1063 cfile.iface = g_strdup(optarg);
1065 capture_option_specified = TRUE;
1069 case 'l': /* "Line-buffer" standard output */
1070 /* This isn't line-buffering, strictly speaking, it's just
1071 flushing the standard output after the information for
1072 each packet is printed; however, that should be good
1073 enough for all the purposes to which "-l" is put (and
1074 is probably actually better for "-V", as it does fewer
1077 See the comment in "wtap_dispatch_cb_print()" for an
1078 explanation of why we do that, and why we don't just
1079 use "setvbuf()" to make the standard output line-buffered
1080 (short version: in Windows, "line-buffered" is the same
1081 as "fully-buffered", and the output buffer is only flushed
1082 when it fills up). */
1083 line_buffered = TRUE;
1085 case 'L': /* Print list of link-layer types and exit */
1087 list_link_layer_types = TRUE;
1090 capture_option_specified = TRUE;
1094 case 'n': /* No name resolution */
1095 g_resolv_flags = RESOLV_NONE;
1097 case 'N': /* Select what types of addresses/port #s to resolve */
1098 if (g_resolv_flags == RESOLV_ALL)
1099 g_resolv_flags = RESOLV_NONE;
1100 badopt = string_to_name_resolve(optarg, &g_resolv_flags);
1101 if (badopt != '\0') {
1102 fprintf(stderr, "tethereal: -N specifies unknown resolving option '%c'; valid options are 'm', 'n', and 't'\n",
1107 case 'o': /* Override preference from command line */
1108 switch (prefs_set_pref(optarg)) {
1110 case PREFS_SET_SYNTAX_ERR:
1111 fprintf(stderr, "tethereal: Invalid -o flag \"%s\"\n", optarg);
1115 case PREFS_SET_NO_SUCH_PREF:
1116 case PREFS_SET_OBSOLETE:
1117 fprintf(stderr, "tethereal: -o flag \"%s\" specifies unknown preference\n",
1123 case 'p': /* Don't capture in promiscuous mode */
1125 capture_opts.promisc_mode = FALSE;
1127 capture_option_specified = TRUE;
1131 case 'q': /* Quiet */
1134 case 'r': /* Read capture file xxx */
1135 cf_name = g_strdup(optarg);
1137 case 'R': /* Read file filter */
1140 case 's': /* Set the snapshot (capture) length */
1142 capture_opts.snaplen = get_positive_int(optarg, "snapshot length");
1144 capture_option_specified = TRUE;
1148 case 'S': /* show packets in real time */
1151 case 't': /* Time stamp type */
1152 if (strcmp(optarg, "r") == 0)
1153 timestamp_type = RELATIVE;
1154 else if (strcmp(optarg, "a") == 0)
1155 timestamp_type = ABSOLUTE;
1156 else if (strcmp(optarg, "ad") == 0)
1157 timestamp_type = ABSOLUTE_WITH_DATE;
1158 else if (strcmp(optarg, "d") == 0)
1159 timestamp_type = DELTA;
1161 fprintf(stderr, "tethereal: Invalid time stamp type \"%s\"\n",
1163 fprintf(stderr, "It must be \"r\" for relative, \"a\" for absolute,\n");
1164 fprintf(stderr, "\"ad\" for absolute with date, or \"d\" for delta.\n");
1168 case 'T': /* printing Type */
1169 if (strcmp(optarg, "text") == 0)
1170 print_format = PR_FMT_TEXT;
1171 else if (strcmp(optarg, "pdml") == 0)
1172 print_format = PR_FMT_PDML;
1173 else if (strcmp(optarg, "ps") == 0)
1174 print_format = PR_FMT_PS;
1176 fprintf(stderr, "tethereal: Invalid -T parameter.\n");
1177 fprintf(stderr, "It must be \"ps\", \"text\" or \"pdml\".\n");
1181 case 'v': /* Show version and exit */
1182 printf("t%s %s\n%s\n%s\n", PACKAGE, VERSION, comp_info_str->str,
1183 runtime_info_str->str);
1186 case 'w': /* Write to capture file xxx */
1187 cfile.save_file = g_strdup(optarg);
1189 case 'V': /* Verbose */
1192 case 'x': /* Print packet data in hex (and ASCII) */
1195 case 'y': /* Set the pcap data link type */
1197 #ifdef HAVE_PCAP_DATALINK_NAME_TO_VAL
1198 capture_opts.linktype = pcap_datalink_name_to_val(optarg);
1199 if (capture_opts.linktype == -1) {
1200 fprintf(stderr, "tethereal: The specified data link type \"%s\" is not valid\n",
1204 #else /* HAVE_PCAP_DATALINK_NAME_TO_VAL */
1205 /* XXX - just treat it as a number */
1206 capture_opts.linktype = get_natural_int(optarg, "data link type");
1207 #endif /* HAVE_PCAP_DATALINK_NAME_TO_VAL */
1209 capture_option_specified = TRUE;
1214 for(tli=tap_list;tli;tli=tli->next){
1215 if(!strncmp(tli->cmd,optarg,strlen(tli->cmd))){
1216 (*tli->func)(optarg);
1221 fprintf(stderr,"tethereal: invalid -z argument.\n");
1222 fprintf(stderr," -z argument must be one of :\n");
1223 for(tli=tap_list;tli;tli=tli->next){
1224 fprintf(stderr," %s\n",tli->cmd);
1230 case '?': /* Bad flag - print usage message */
1236 /* If printing PDML or PS, force -V */
1237 if (print_format == PR_FMT_PDML || print_format == PR_FMT_PS)
1240 /* If no capture filter or read filter has been specified, and there are
1241 still command-line arguments, treat them as the tokens of a capture
1242 filter (if no "-r" flag was specified) or a read filter (if a "-r"
1243 flag was specified. */
1244 if (optind < argc) {
1245 if (cf_name != NULL) {
1246 if (rfilter != NULL) {
1248 "tethereal: Read filters were specified both with \"-R\" and with additional command-line arguments\n");
1251 rfilter = get_args_as_string(argc, argv, optind);
1254 if (capture_filter_specified) {
1256 "tethereal: Capture filters were specified both with \"-f\" and with additional command-line arguments\n");
1259 cfile.cfilter = get_args_as_string(argc, argv, optind);
1261 capture_option_specified = TRUE;
1266 /* See if we're writing a capture file and the file is a pipe */
1268 ld.output_to_pipe = FALSE;
1270 if (cfile.save_file != NULL) {
1271 if (strcmp(cfile.save_file, "-") == 0) {
1273 g_free(cfile.save_file);
1274 cfile.save_file = g_strdup("");
1276 ld.output_to_pipe = TRUE;
1281 err = test_for_fifo(cfile.save_file);
1284 case ENOENT: /* it doesn't exist, so we'll be creating it,
1285 and it won't be a FIFO */
1286 case 0: /* found it, but it's not a FIFO */
1289 case ESPIPE: /* it is a FIFO */
1290 ld.output_to_pipe = TRUE;
1293 default: /* couldn't stat it */
1295 "tethereal: Error testing whether capture file is a pipe: %s\n",
1303 #ifndef HAVE_LIBPCAP
1304 if (capture_option_specified)
1305 fprintf(stderr, "This version of Tethereal was not built with support for capturing packets.\n");
1313 if (list_link_layer_types) {
1314 /* We're supposed to list the link-layer types for an interface;
1315 did the user also specify a capture file to be read? */
1317 /* Yes - that's bogus. */
1318 fprintf(stderr, "tethereal: You cannot specify -L and a capture file to be read.\n");
1321 /* No - did they specify a ring buffer option? */
1322 if (capture_opts.ringbuffer_on) {
1323 fprintf(stderr, "tethereal: Ring buffer requested, but a capture is not being done.\n");
1327 /* If they didn't specify a "-w" flag, but specified a maximum capture
1328 file size, tell them that this doesn't work, and exit. */
1329 if (capture_opts.has_autostop_filesize && cfile.save_file == NULL) {
1330 fprintf(stderr, "tethereal: Maximum capture file size specified, but "
1331 "capture isn't being saved to a file.\n");
1335 if (capture_opts.ringbuffer_on) {
1336 /* Ring buffer works only under certain conditions:
1337 a) ring buffer does not work if you're not saving the capture to
1339 b) ring buffer only works if you're saving in libpcap format;
1340 c) it makes no sense to enable the ring buffer if the maximum
1341 file size is set to "infinite";
1342 d) file must not be a pipe. */
1343 if (cfile.save_file == NULL) {
1344 fprintf(stderr, "tethereal: Ring buffer requested, but "
1345 "capture isn't being saved to a file.\n");
1348 if (out_file_type != WTAP_FILE_PCAP) {
1349 fprintf(stderr, "tethereal: Ring buffer requested, but "
1350 "capture isn't being saved in libpcap format.\n");
1353 if (!capture_opts.has_autostop_filesize) {
1354 fprintf(stderr, "tethereal: Ring buffer requested, but "
1355 "no maximum capture file size was specified.\n");
1358 if (ld.output_to_pipe) {
1359 fprintf(stderr, "tethereal: Ring buffer requested, but "
1360 "capture file is a pipe.\n");
1368 /* Start windows sockets */
1369 WSAStartup( MAKEWORD( 1, 1 ), &wsaData );
1372 /* Notify all registered modules that have had any of their preferences
1373 changed either from one of the preferences file or from the command
1374 line that their preferences have changed. */
1377 /* disabled protocols as per configuration file */
1378 if (dp_path == NULL) {
1379 set_disabled_protos_list();
1382 /* Build the column format array */
1383 col_setup(&cfile.cinfo, prefs->num_cols);
1384 for (i = 0; i < cfile.cinfo.num_cols; i++) {
1385 cfile.cinfo.col_fmt[i] = get_column_format(i);
1386 cfile.cinfo.col_title[i] = g_strdup(get_column_title(i));
1387 cfile.cinfo.fmt_matx[i] = (gboolean *) g_malloc0(sizeof(gboolean) *
1389 get_column_format_matches(cfile.cinfo.fmt_matx[i], cfile.cinfo.col_fmt[i]);
1390 cfile.cinfo.col_data[i] = NULL;
1391 if (cfile.cinfo.col_fmt[i] == COL_INFO)
1392 cfile.cinfo.col_buf[i] = (gchar *) g_malloc(sizeof(gchar) * COL_MAX_INFO_LEN);
1394 cfile.cinfo.col_buf[i] = (gchar *) g_malloc(sizeof(gchar) * COL_MAX_LEN);
1395 cfile.cinfo.col_fence[i] = 0;
1396 cfile.cinfo.col_expr[i] = (gchar *) g_malloc(sizeof(gchar) * COL_MAX_LEN);
1397 cfile.cinfo.col_expr_val[i] = (gchar *) g_malloc(sizeof(gchar) * COL_MAX_LEN);
1400 for (i = 0; i < cfile.cinfo.num_cols; i++) {
1403 for (j = 0; j < NUM_COL_FMTS; j++) {
1404 if (!cfile.cinfo.fmt_matx[i][j])
1407 if (cfile.cinfo.col_first[j] == -1)
1408 cfile.cinfo.col_first[j] = i;
1409 cfile.cinfo.col_last[j] = i;
1414 if (capture_opts.snaplen < 1)
1415 capture_opts.snaplen = WTAP_MAX_PACKET_SIZE;
1416 else if (capture_opts.snaplen < MIN_PACKET_SIZE)
1417 capture_opts.snaplen = MIN_PACKET_SIZE;
1419 /* Check the value range of the ringbuffer_num_files parameter */
1420 if (capture_opts.ringbuffer_num_files > RINGBUFFER_MAX_NUM_FILES)
1421 capture_opts.ringbuffer_num_files = RINGBUFFER_MAX_NUM_FILES;
1422 #if RINGBUFFER_MIN_NUM_FILES > 0
1423 else if (capture_opts.ringbuffer_num_files < RINGBUFFER_MIN_NUM_FILES)
1424 capture_opts.ringbuffer_num_files = RINGBUFFER_MIN_NUM_FILES;
1428 if (rfilter != NULL) {
1429 if (!dfilter_compile(rfilter, &rfcode)) {
1430 fprintf(stderr, "tethereal: %s\n", dfilter_error_msg);
1432 #ifdef HAVE_PCAP_COMPILE_NOPCAP
1433 if (pcap_compile_nopcap(DLT_EN10MB, 0, &fcode, rfilter, 0, 0) != -1) {
1435 " Note: This display filter code looks like a valid capture filter;\n"
1436 " maybe you mixed them up?\n");
1442 cfile.rfcode = rfcode;
1445 * We're reading a capture file.
1450 * Immediately relinquish any set-UID or set-GID privileges we have;
1451 * we must not be allowed to read any capture files the user running
1452 * Tethereal can't open.
1458 err = cf_open(cf_name, FALSE, &cfile);
1463 err = load_cap_file(&cfile, out_file_type);
1470 /* No capture file specified, so we're supposed to do a live capture
1471 (or get a list of link-layer types for a live capture device);
1472 do we have support for live captures? */
1477 fprintf(stderr, "tethereal: Could not load wpcap.dll.\n");
1482 /* Yes; did the user specify an interface to use? */
1483 if (cfile.iface == NULL) {
1484 /* No - is a default specified in the preferences file? */
1485 if (prefs->capture_device != NULL) {
1487 if_text = strrchr(prefs->capture_device, ' ');
1488 if (if_text == NULL) {
1489 cfile.iface = g_strdup(prefs->capture_device);
1491 cfile.iface = g_strdup(if_text + 1); /* Skip over space */
1494 /* No - pick the first one from the list of interfaces. */
1495 if_list = get_interface_list(&err, err_str);
1496 if (if_list == NULL) {
1499 case CANT_GET_INTERFACE_LIST:
1500 fprintf(stderr, "tethereal: Can't get list of interfaces: %s\n",
1504 case NO_INTERFACES_FOUND:
1505 fprintf(stderr, "tethereal: There are no interfaces on which a capture can be done\n");
1510 if_info = if_list->data; /* first interface */
1511 cfile.iface = g_strdup(if_info->name);
1512 free_interface_list(if_list);
1516 if (list_link_layer_types) {
1517 /* We were asked to list the link-layer types for an interface.
1518 Get the list of link-layer types for the capture device. */
1519 lt_list = get_pcap_linktype_list(cfile.iface, err_str);
1520 if (lt_list == NULL) {
1521 if (err_str[0] != '\0') {
1522 fprintf(stderr, "tethereal: The list of data link types for the capture device could not be obtained (%s).\n"
1523 "Please check to make sure you have sufficient permissions, and that\n"
1524 "you have the proper interface or pipe specified.\n", err_str);
1526 fprintf(stderr, "tethereal: The capture device has no data link types.\n");
1529 fprintf(stderr, "Data link types (use option -y to set):\n");
1530 for (lt_entry = lt_list; lt_entry != NULL;
1531 lt_entry = g_list_next(lt_entry)) {
1532 data_link_info = lt_entry->data;
1533 fprintf(stderr, " %s", data_link_info->name);
1534 if (data_link_info->description != NULL)
1535 fprintf(stderr, " (%s)", data_link_info->description);
1537 fprintf(stderr, " (not supported)");
1540 free_pcap_linktype_list(lt_list);
1544 capture(out_file_type);
1546 if (capture_opts.ringbuffer_on) {
1550 /* No - complain. */
1551 fprintf(stderr, "This version of Tethereal was not built with support for capturing packets.\n");
1556 draw_tap_listeners(TRUE);
1563 /* Do the low-level work of a capture.
1564 Returns TRUE if it succeeds, FALSE otherwise. */
1566 static condition *volatile cnd_ring_timeout = NULL; /* this must be visible in wtap_dispatch_cb_write */
1569 capture(int out_file_type)
1573 gchar open_err_str[PCAP_ERRBUF_SIZE];
1574 gchar lookup_net_err_str[PCAP_ERRBUF_SIZE];
1575 bpf_u_int32 netnum, netmask;
1576 struct bpf_program fcode;
1577 const char *set_linktype_err_str;
1578 void (*oldhandler)(int);
1580 int volatile volatile_err = 0;
1581 int volatile inpkts = 0;
1583 char errmsg[1024+1];
1584 condition *volatile cnd_stop_capturesize = NULL;
1585 condition *volatile cnd_stop_timeout = NULL;
1587 static const char ppamsg[] = "can't find PPA for ";
1589 volatile int pipe_fd = -1;
1590 struct pcap_hdr hdr;
1591 struct pcaprec_modified_hdr rechdr;
1592 guchar pcap_data[WTAP_MAX_PACKET_SIZE];
1594 struct pcap_stat stats;
1597 dfilter_t *rfcode = NULL;
1599 /* Initialize all data structures used for dissection. */
1602 ld.linktype = WTAP_ENCAP_UNKNOWN;
1605 /* Open the network interface to capture from it.
1606 Some versions of libpcap may put warnings into the error buffer
1607 if they succeed; to tell if that's happened, we have to clear
1608 the error buffer, and check if it's still a null string. */
1609 open_err_str[0] = '\0';
1610 ld.pch = pcap_open_live(cfile.iface, capture_opts.snaplen,
1611 capture_opts.promisc_mode, 1000, open_err_str);
1613 if (ld.pch != NULL) {
1614 /* setting the data link type only works on real interfaces */
1615 if (capture_opts.linktype != -1) {
1616 set_linktype_err_str = set_pcap_linktype(ld.pch, cfile.iface,
1617 capture_opts.linktype);
1618 if (set_linktype_err_str != NULL) {
1619 snprintf(errmsg, sizeof errmsg, "Unable to set data link type (%s).",
1620 set_linktype_err_str);
1625 /* We couldn't open "cfile.iface" as a network device. */
1627 /* On Windows, we don't support capturing on pipes, so we give up. */
1629 /* On Win32 OSes, the capture devices are probably available to all
1630 users; don't warn about permissions problems.
1632 Do, however, warn that WAN devices aren't supported. */
1633 snprintf(errmsg, sizeof errmsg,
1634 "The capture session could not be initiated (%s).\n"
1635 "Please check that you have the proper interface specified.\n"
1637 "Note that the driver Tethereal uses for packet capture on Windows doesn't\n"
1638 "support capturing on PPP/WAN interfaces in Windows NT/2000/XP/.NET Server.\n",
1642 /* try to open cfile.iface as a pipe */
1643 pipe_fd = pipe_open_live(cfile.iface, &hdr, &ld, errmsg, sizeof errmsg);
1645 if (pipe_fd == -1) {
1647 if (ld.pipe_err == PIPNEXIST) {
1648 /* Pipe doesn't exist, so output message for interface */
1650 /* If we got a "can't find PPA for XXX" message, warn the user (who
1651 is running Tethereal on HP-UX) that they don't have a version
1652 of libpcap that properly handles HP-UX (libpcap 0.6.x and later
1653 versions, which properly handle HP-UX, say "can't find /dev/dlpi
1654 PPA for XXX" rather than "can't find PPA for XXX"). */
1655 if (strncmp(open_err_str, ppamsg, sizeof ppamsg - 1) == 0)
1658 "You are running Tethereal with a version of the libpcap library\n"
1659 "that doesn't handle HP-UX network devices well; this means that\n"
1660 "Tethereal may not be able to capture packets.\n"
1662 "To fix this, you should install libpcap 0.6.2, or a later version\n"
1663 "of libpcap, rather than libpcap 0.4 or 0.5.x. It is available in\n"
1664 "packaged binary form from the Software Porting And Archive Centre\n"
1665 "for HP-UX; the Centre is at http://hpux.connect.org.uk/ - the page\n"
1666 "at the URL lists a number of mirror sites.";
1669 snprintf(errmsg, sizeof errmsg,
1670 "The capture session could not be initiated (%s).\n"
1671 "Please check to make sure you have sufficient permissions, and that\n"
1672 "you have the proper interface or pipe specified.%s", open_err_str,
1676 * Else pipe (or file) does exist and pipe_open_live() has
1681 /* pipe_open_live() succeeded; don't want
1682 error message from pcap_open_live() */
1683 open_err_str[0] = '\0';
1689 * We've opened the capture device, so, if we're set-UID or set-GID,
1690 * relinquish those privileges.
1692 * XXX - if we have saved set-user-ID support, we should give up those
1693 * privileges immediately, and then reclaim them long enough to get
1694 * a list of network interfaces and to open one, and then give them
1695 * up again, so that stuff we do while processing the argument list,
1696 * reading the user's preferences, etc. is done as the real user and
1697 * group, not the effective user and group.
1703 if (cfile.cfilter && !ld.from_pipe) {
1704 /* A capture filter was specified; set it up. */
1705 if (pcap_lookupnet(cfile.iface, &netnum, &netmask, lookup_net_err_str) < 0) {
1707 * Well, we can't get the netmask for this interface; it's used
1708 * only for filters that check for broadcast IP addresses, so
1709 * we just warn the user, and punt and use 0.
1712 "Warning: Couldn't obtain netmask info (%s).\n", lookup_net_err_str);
1715 if (pcap_compile(ld.pch, &fcode, cfile.cfilter, 1, netmask) < 0) {
1716 if (dfilter_compile(cfile.cfilter, &rfcode)) {
1717 snprintf(errmsg, sizeof errmsg,
1718 "Unable to parse capture filter string (%s).\n"
1719 " Interestingly enough, this looks like a valid display filter\n"
1720 " Are you sure you didn't mix them up?",
1721 pcap_geterr(ld.pch));
1723 snprintf(errmsg, sizeof errmsg,
1724 "Unable to parse capture filter string (%s).",
1725 pcap_geterr(ld.pch));
1729 if (pcap_setfilter(ld.pch, &fcode) < 0) {
1730 snprintf(errmsg, sizeof errmsg, "Can't install filter (%s).",
1731 pcap_geterr(ld.pch));
1736 /* Set up to write to the capture file. */
1739 pcap_encap = hdr.network;
1740 file_snaplen = hdr.snaplen;
1744 pcap_encap = get_pcap_linktype(ld.pch, cfile.iface);
1745 file_snaplen = pcap_snapshot(ld.pch);
1747 ld.linktype = wtap_pcap_encap_to_wtap_encap(pcap_encap);
1748 if (cfile.save_file != NULL) {
1749 /* Set up to write to the capture file. */
1750 if (ld.linktype == WTAP_ENCAP_UNKNOWN) {
1751 strcpy(errmsg, "The network you're capturing from is of a type"
1752 " that Tethereal doesn't support.");
1755 if (capture_opts.ringbuffer_on) {
1756 cfile.save_file_fd = ringbuf_init(cfile.save_file,
1757 capture_opts.ringbuffer_num_files);
1758 if (cfile.save_file_fd != -1) {
1759 ld.pdh = ringbuf_init_wtap_dump_fdopen(out_file_type, ld.linktype,
1760 pcap_snapshot(ld.pch), &err);
1762 err = errno; /* "ringbuf_init()" failed */
1766 ld.pdh = wtap_dump_open(cfile.save_file, out_file_type,
1767 ld.linktype, pcap_snapshot(ld.pch), &err);
1770 if (ld.pdh == NULL) {
1771 snprintf(errmsg, sizeof errmsg,
1772 file_open_error_message(err, TRUE, out_file_type),
1773 *cfile.save_file == '\0' ? "stdout" : cfile.save_file);
1778 /* Does "open_err_str" contain a non-empty string? If so, "pcap_open_live()"
1779 returned a warning; print it, but keep capturing. */
1780 if (open_err_str[0] != '\0')
1781 fprintf(stderr, "tethereal: WARNING: %s.\n", open_err_str);
1784 /* Catch a CTRL+C event and, if we get it, clean up and exit. */
1785 SetConsoleCtrlHandler(capture_cleanup, TRUE);
1787 /* Catch SIGINT and SIGTERM and, if we get either of them, clean up
1789 XXX - deal with signal semantics on various UNIX platforms. Or just
1790 use "sigaction()" and be done with it? */
1791 signal(SIGTERM, capture_cleanup);
1792 signal(SIGINT, capture_cleanup);
1793 if ((oldhandler = signal(SIGHUP, capture_cleanup)) != SIG_DFL)
1794 signal(SIGHUP, oldhandler);
1797 /* Catch SIGINFO and, if we get it and we're capturing to a file in
1798 quiet mode, report the number of packets we've captured. */
1799 signal(SIGINFO, report_counts_siginfo);
1800 #endif /* SIGINFO */
1803 /* Let the user know what interface was chosen. */
1804 fprintf(stderr, "Capturing on %s\n", cfile.iface);
1806 /* initialize capture stop conditions */
1807 init_capture_stop_conditions();
1808 /* create stop conditions */
1809 if (capture_opts.has_autostop_filesize)
1810 cnd_stop_capturesize = cnd_new((const char*)CND_CLASS_CAPTURESIZE,
1811 (long)capture_opts.autostop_filesize * 1000);
1812 if (capture_opts.has_autostop_duration)
1813 cnd_stop_timeout = cnd_new((const char*)CND_CLASS_TIMEOUT,
1814 (gint32)capture_opts.autostop_duration);
1816 if (capture_opts.ringbuffer_on && capture_opts.has_ring_duration)
1817 cnd_ring_timeout = cnd_new(CND_CLASS_TIMEOUT,
1818 capture_opts.ringbuffer_duration);
1820 if (!setjmp(ld.stopenv)) {
1822 ld.packet_count = 0;
1826 /* We need to be careful with automatic variables defined in the
1827 outer scope which are changed inside the loop. Most compilers
1828 don't try to roll them back to their original values after the
1829 longjmp which causes the loop to finish, but all that the
1830 standards say is that their values are indeterminate. If we
1831 don't want them to be rolled back, we should define them with the
1832 volatile attribute (paraphrasing W. Richard Stevens, Advanced
1833 Programming in the UNIX Environment, p. 178).
1835 The "err" variable causes a particular problem. If we give it
1836 the volatile attribute, then when we pass a reference to it (as
1837 in "&err") to a function, GCC warns: "passing arg <n> of
1838 <function> discards qualifiers from pointer target type".
1839 Therefore within the loop and just beyond we don't use "err".
1840 Within the loop we define "loop_err", and assign its value to
1841 "volatile_err", which is in the outer scope and is checked when
1844 We also define "packet_count_prev" here to keep things tidy,
1845 since it's used only inside the loop. If it were defined in the
1846 outer scope, GCC would give a warning (unnecessary in this case)
1847 that it might be clobbered, and we'd need to give it the volatile
1848 attribute to suppress the warning. */
1851 int packet_count_prev = 0;
1853 if (cnd_stop_capturesize == NULL && cnd_stop_timeout == NULL) {
1854 /* We're not stopping at a particular capture file size, and we're
1855 not stopping after some particular amount of time has expired,
1856 so either we have no stop condition or the only stop condition
1857 is a maximum packet count.
1859 If there's no maximum packet count, pass it -1, meaning "until
1860 you run out of packets in the bufferful you read". Otherwise,
1861 pass it the number of packets we have left to capture.
1863 We don't call "pcap_loop()" as, if we're saving to a file that's
1864 a FIFO, we want to flush the FIFO after we're done processing
1865 this libpcap bufferful of packets, so that the program
1866 reading the FIFO sees the packets immediately and doesn't get
1867 any partial packet, forcing it to block in the middle of reading
1869 if (capture_opts.autostop_count == 0)
1872 if (ld.packet_count >= capture_opts.autostop_count) {
1873 /* XXX do we need this test here? */
1874 /* It appears there's nothing more to capture. */
1877 pcap_cnt = capture_opts.autostop_count - ld.packet_count;
1880 /* We need to check the capture file size or the timeout after
1886 inpkts = pipe_dispatch(pipe_fd, &ld, &hdr, &rechdr, pcap_data,
1887 errmsg, sizeof errmsg);
1890 inpkts = pcap_dispatch(ld.pch, pcap_cnt, capture_pcap_cb, (guchar *) &ld);
1892 /* Error from "pcap_dispatch()", or error or "no more packets" from
1893 "pipe_dispatch(). */
1895 } else if (cnd_stop_timeout != NULL && cnd_eval(cnd_stop_timeout)) {
1896 /* The specified capture time has elapsed; stop the capture. */
1898 } else if (inpkts > 0) {
1899 if (capture_opts.autostop_count != 0 &&
1900 ld.packet_count >= capture_opts.autostop_count) {
1901 /* The specified number of packets have been captured and have
1902 passed both any capture filter in effect and any read filter
1905 } else if (cnd_stop_capturesize != NULL &&
1906 cnd_eval(cnd_stop_capturesize,
1907 (guint32)wtap_get_bytes_dumped(ld.pdh))) {
1908 /* We're saving the capture to a file, and the capture file reached
1909 its maximum size. */
1910 if (capture_opts.ringbuffer_on) {
1911 /* Switch to the next ringbuffer file */
1912 if (ringbuf_switch_file(&cfile, &ld.pdh, &loop_err)) {
1913 /* File switch succeeded: reset the condition */
1914 cnd_reset(cnd_stop_capturesize);
1915 if (cnd_ring_timeout) {
1916 cnd_reset(cnd_ring_timeout);
1919 /* File switch failed: stop here */
1920 volatile_err = loop_err;
1924 /* No ringbuffer - just stop. */
1928 if (ld.output_to_pipe) {
1929 if (ld.packet_count > packet_count_prev) {
1930 if (fflush(wtap_dump_file(ld.pdh))) {
1931 volatile_err = errno;
1934 packet_count_prev = ld.packet_count;
1938 } /* while (ld.go) */
1940 /* delete stop conditions */
1941 if (cnd_stop_capturesize != NULL)
1942 cnd_delete(cnd_stop_capturesize);
1943 if (cnd_stop_timeout != NULL)
1944 cnd_delete(cnd_stop_timeout);
1945 if (cnd_ring_timeout != NULL)
1946 cnd_delete(cnd_ring_timeout);
1948 if ((cfile.save_file != NULL) && !quiet) {
1949 /* We're saving to a file, which means we're printing packet counts
1950 to stderr if we are not running silent and deep.
1951 Send a newline so that we move to the line after the packet count. */
1952 fprintf(stderr, "\n");
1955 /* If we got an error while capturing, report it. */
1959 if (ld.pipe_err == PIPERR) {
1960 fprintf(stderr, "tethereal: Error while capturing packets: %s\n",
1966 fprintf(stderr, "tethereal: Error while capturing packets: %s\n",
1967 pcap_geterr(ld.pch));
1971 if (volatile_err == 0)
1974 show_capture_file_io_error(cfile.save_file, volatile_err, FALSE);
1978 if (cfile.save_file != NULL) {
1979 /* We're saving to a file or files; close all files. */
1980 if (capture_opts.ringbuffer_on) {
1981 dump_ok = ringbuf_wtap_dump_close(&cfile, &err);
1983 dump_ok = wtap_dump_close(ld.pdh, &err);
1985 /* If we've displayed a message about a write error, there's no point
1986 in displaying another message about an error on close. */
1987 if (!dump_ok && !write_err)
1988 show_capture_file_io_error(cfile.save_file, err, TRUE);
1992 if (ld.from_pipe && pipe_fd >= 0)
1997 /* Get the capture statistics, and, if any packets were dropped, report
1999 if (pcap_stats(ld.pch, &stats) >= 0) {
2000 if (stats.ps_drop != 0) {
2001 fprintf(stderr, "%u packets dropped\n", stats.ps_drop);
2004 fprintf(stderr, "tethereal: Can't get packet-drop statistics: %s\n",
2005 pcap_geterr(ld.pch));
2010 /* Report the number of captured packets if not reported during capture
2011 and we are saving to a file. */
2017 if (capture_opts.ringbuffer_on) {
2018 ringbuf_error_cleanup();
2020 g_free(cfile.save_file);
2021 cfile.save_file = NULL;
2022 fprintf(stderr, "tethereal: %s\n", errmsg);
2038 capture_pcap_cb(guchar *user, const struct pcap_pkthdr *phdr,
2041 struct wtap_pkthdr whdr;
2042 union wtap_pseudo_header pseudo_header;
2043 loop_data *ld = (loop_data *) user;
2047 /* Convert from libpcap to Wiretap format.
2048 If that fails, ignore the packet (wtap_process_pcap_packet has
2049 written an error message). */
2050 pd = wtap_process_pcap_packet(ld->linktype, phdr, pd, &pseudo_header,
2059 wtap_dispatch_cb_write((guchar *)&args, &whdr, 0, &pseudo_header, pd);
2060 /* Report packet capture count if not quiet */
2063 if (ld->packet_count != 0) {
2064 fprintf(stderr, "\r%u ", ld->packet_count);
2065 /* stderr could be line buffered */
2069 wtap_dispatch_cb_print((guchar *)&args, &whdr, 0,
2070 &pseudo_header, pd);
2074 wtap_dispatch_cb_print((guchar *)&args, &whdr, 0, &pseudo_header, pd);
2080 capture_cleanup(DWORD ctrltype _U_)
2082 /* CTRL_C_EVENT is sort of like SIGINT, CTRL_BREAK_EVENT is unique to
2083 Windows, CTRL_CLOSE_EVENT is sort of like SIGHUP, CTRL_LOGOFF_EVENT
2084 is also sort of like SIGHUP, and CTRL_SHUTDOWN_EVENT is sort of
2085 like SIGTERM at least when the machine's shutting down.
2087 For now, we handle them all as indications that we should clean up
2088 and quit, just as we handle SIGINT, SIGHUP, and SIGTERM in that
2091 However, as handlers run in a new thread, we can't just longjmp
2092 out; we have to set "ld.go" to FALSE, and must return TRUE so that
2093 no other handler - such as one that would terminate the process -
2096 XXX - for some reason, typing ^C to Tethereal, if you run this in
2097 a Cygwin console window in at least some versions of Cygwin,
2098 causes Tethereal to terminate immediately; this routine gets
2099 called, but the main loop doesn't get a chance to run and
2100 exit cleanly, at least if this is compiled with Microsoft Visual
2101 C++ (i.e., it's a property of the Cygwin console window or Bash;
2102 it happens if Tethereal is not built with Cygwin - for all I know,
2103 building it with Cygwin may make the problem go away). */
2109 capture_cleanup(int signum _U_)
2111 /* Longjmp back to the starting point; "pcap_dispatch()", on many
2112 UNIX platforms, just keeps looping if it gets EINTR, so if we set
2113 "ld.go" to FALSE and return, we won't break out of it and quit
2115 longjmp(ld.stopenv, 1);
2123 /* XXX - if we use sigaction, this doesn't have to be done.
2124 (Yes, this isn't necessary on BSD, but just in case a system
2125 where "signal()" has AT&T semantics adopts SIGINFO....) */
2126 signal(SIGINFO, report_counts_siginfo);
2127 #endif /* SIGINFO */
2129 if (cfile.save_file != NULL && quiet) {
2130 /* Report the count only if we're capturing to a file (rather
2131 than printing captured packet information out) and aren't
2132 updating a count as packets arrive. */
2133 fprintf(stderr, "%u packets captured\n", ld.packet_count);
2136 infoprint = FALSE; /* we just reported it */
2137 #endif /* SIGINFO */
2142 report_counts_siginfo(int signum _U_)
2144 int sav_errno = errno;
2145 /* If we've been told to delay printing, just set a flag asking
2146 that we print counts (if we're supposed to), otherwise print
2147 the count of packets captured (if we're supposed to). */
2154 #endif /* SIGINFO */
2155 #endif /* HAVE_LIBPCAP */
2158 load_cap_file(capture_file *cf, int out_file_type)
2161 int snapshot_length;
2167 linktype = wtap_file_encap(cf->wth);
2168 if (cf->save_file != NULL) {
2169 /* Set up to write to the capture file. */
2170 snapshot_length = wtap_snapshot_length(cf->wth);
2171 if (snapshot_length == 0) {
2172 /* Snapshot length of input file not known. */
2173 snapshot_length = WTAP_MAX_PACKET_SIZE;
2175 pdh = wtap_dump_open(cf->save_file, out_file_type,
2176 linktype, snapshot_length, &err);
2179 /* We couldn't set up to write to the capture file. */
2182 case WTAP_ERR_UNSUPPORTED_FILE_TYPE:
2184 "tethereal: Capture files can't be written in that format.\n");
2187 case WTAP_ERR_UNSUPPORTED_ENCAP:
2188 case WTAP_ERR_ENCAP_PER_PACKET_UNSUPPORTED:
2190 "tethereal: The capture file being read cannot be written in "
2194 case WTAP_ERR_CANT_OPEN:
2196 "tethereal: The file \"%s\" couldn't be created for some "
2197 "unknown reason.\n",
2198 *cf->save_file == '\0' ? "stdout" : cf->save_file);
2201 case WTAP_ERR_SHORT_WRITE:
2203 "tethereal: A full header couldn't be written to the file \"%s\".\n",
2204 *cf->save_file == '\0' ? "stdout" : cf->save_file);
2209 "tethereal: The file \"%s\" could not be created: %s\n.",
2210 *cf->save_file == '\0' ? "stdout" : cf->save_file,
2211 wtap_strerror(err));
2218 success = wtap_loop(cf->wth, 0, wtap_dispatch_cb_write, (guchar *) &args,
2221 /* Now close the capture file. */
2222 if (!wtap_dump_close(pdh, &err))
2223 show_capture_file_io_error(cfile.save_file, err, TRUE);
2227 print_preamble(stdout, print_format);
2228 success = wtap_loop(cf->wth, 0, wtap_dispatch_cb_print, (guchar *) &args,
2230 print_finale(stdout, print_format);
2233 /* Print up a message box noting that the read failed somewhere along
2237 case WTAP_ERR_UNSUPPORTED_ENCAP:
2239 "tethereal: \"%s\" is a capture file is for a network type that Tethereal doesn't support.\n",
2243 case WTAP_ERR_CANT_READ:
2245 "tethereal: An attempt to read from \"%s\" failed for some unknown reason.\n",
2249 case WTAP_ERR_SHORT_READ:
2251 "tethereal: \"%s\" appears to have been cut short in the middle of a packet.\n",
2255 case WTAP_ERR_BAD_RECORD:
2257 "tethereal: \"%s\" appears to be damaged or corrupt.\n",
2263 "tethereal: An error occurred while reading \"%s\": %s.\n",
2264 cf->filename, wtap_strerror(err));
2270 wtap_close(cf->wth);
2277 fill_in_fdata(frame_data *fdata, capture_file *cf,
2278 const struct wtap_pkthdr *phdr, long offset)
2283 fdata->num = cf->count;
2284 fdata->pkt_len = phdr->len;
2285 cul_bytes += phdr->len;
2286 fdata->cul_bytes = cul_bytes;
2287 fdata->cap_len = phdr->caplen;
2288 fdata->file_off = offset;
2289 fdata->lnk_t = phdr->pkt_encap;
2290 fdata->abs_secs = phdr->ts.tv_sec;
2291 fdata->abs_usecs = phdr->ts.tv_usec;
2292 fdata->flags.passed_dfilter = 0;
2293 fdata->flags.encoding = CHAR_ASCII;
2294 fdata->flags.visited = 0;
2295 fdata->flags.marked = 0;
2296 fdata->flags.ref_time = 0;
2298 /* If we don't have the time stamp of the first packet in the
2299 capture, it's because this is the first packet. Save the time
2300 stamp of this packet as the time stamp of the first packet. */
2301 if (!firstsec && !firstusec) {
2302 firstsec = fdata->abs_secs;
2303 firstusec = fdata->abs_usecs;
2306 /* If we don't have the time stamp of the previous displayed packet,
2307 it's because this is the first displayed packet. Save the time
2308 stamp of this packet as the time stamp of the previous displayed
2310 if (!prevsec && !prevusec) {
2311 prevsec = fdata->abs_secs;
2312 prevusec = fdata->abs_usecs;
2315 /* Get the time elapsed between the first packet and this packet. */
2316 compute_timestamp_diff(&fdata->rel_secs, &fdata->rel_usecs,
2317 fdata->abs_secs, fdata->abs_usecs, firstsec, firstusec);
2319 /* If it's greater than the current elapsed time, set the elapsed time
2320 to it (we check for "greater than" so as not to be confused by
2321 time moving backwards). */
2322 if ((gint32)cf->esec < fdata->rel_secs
2323 || ((gint32)cf->esec == fdata->rel_secs && (gint32)cf->eusec < fdata->rel_usecs)) {
2324 cf->esec = fdata->rel_secs;
2325 cf->eusec = fdata->rel_usecs;
2328 /* Get the time elapsed between the previous displayed packet and
2330 compute_timestamp_diff(&fdata->del_secs, &fdata->del_usecs,
2331 fdata->abs_secs, fdata->abs_usecs, prevsec, prevusec);
2332 prevsec = fdata->abs_secs;
2333 prevusec = fdata->abs_usecs;
2336 /* Free up all data attached to a "frame_data" structure. */
2338 clear_fdata(frame_data *fdata)
2341 g_slist_free(fdata->pfd);
2345 wtap_dispatch_cb_write(guchar *user, const struct wtap_pkthdr *phdr,
2346 long offset, union wtap_pseudo_header *pseudo_header, const guchar *buf)
2348 cb_args_t *args = (cb_args_t *) user;
2349 capture_file *cf = args->cf;
2350 wtap_dumper *pdh = args->pdh;
2354 epan_dissect_t *edt;
2359 * Prevent a SIGINFO handler from writing to stdout while we're
2360 * doing so; instead, have it just set a flag telling us to print
2361 * that information when we're done.
2364 #endif /* SIGINFO */
2365 #endif /* HAVE_LIBPCAP */
2369 fill_in_fdata(&fdata, cf, phdr, offset);
2370 edt = epan_dissect_new(TRUE, FALSE);
2371 epan_dissect_prime_dfilter(edt, cf->rfcode);
2372 epan_dissect_run(edt, pseudo_header, buf, &fdata, NULL);
2373 passed = dfilter_apply_edt(cf->rfcode, edt);
2379 /* The packet passed the read filter. */
2385 /* The current packet may have arrived after a very long silence,
2386 * way past the time to switch files. In order not to have
2387 * the first packet of a new series of events as the last
2388 * [or only] packet in the file, switch before writing!
2390 if (cnd_ring_timeout != NULL && cnd_eval(cnd_ring_timeout)) {
2391 /* time elasped for this ring file, switch to the next */
2392 if (ringbuf_switch_file(&cfile, &ld.pdh, &loop_err)) {
2393 /* File switch succeeded: reset the condition */
2394 cnd_reset(cnd_ring_timeout);
2396 /* File switch failed: stop here */
2397 /* XXX - we should do something with "loop_err" */
2402 if (!wtap_dump(pdh, phdr, pseudo_header, buf, &err)) {
2404 if (ld.pch != NULL && !quiet) {
2405 /* We're capturing packets, so (if -q not specified) we're printing
2406 a count of packets captured; move to the line after the count. */
2407 fprintf(stderr, "\n");
2410 show_capture_file_io_error(cf->save_file, err, FALSE);
2415 wtap_dump_close(pdh, &err);
2420 epan_dissect_free(edt);
2422 clear_fdata(&fdata);
2427 * Allow SIGINFO handlers to write.
2432 * If a SIGINFO handler asked us to write out capture counts, do so.
2436 #endif /* SIGINFO */
2437 #endif /* HAVE_LIBPCAP */
2441 show_capture_file_io_error(const char *fname, int err, gboolean is_close)
2450 "tethereal: Not all the packets could be written to \"%s\" because there is "
2451 "no space left on the file system.\n",
2458 "tethereal: Not all the packets could be written to \"%s\" because you are "
2459 "too close to, or over your disk quota.\n",
2464 case WTAP_ERR_CANT_CLOSE:
2466 "tethereal: \"%s\" couldn't be closed for some unknown reason.\n",
2470 case WTAP_ERR_SHORT_WRITE:
2472 "tethereal: Not all the packets could be written to \"%s\".\n",
2479 "tethereal: \"%s\" could not be closed: %s.\n",
2480 fname, wtap_strerror(err));
2483 "tethereal: An error occurred while writing to \"%s\": %s.\n",
2484 fname, wtap_strerror(err));
2491 wtap_dispatch_cb_print(guchar *user, const struct wtap_pkthdr *phdr,
2492 long offset, union wtap_pseudo_header *pseudo_header, const guchar *buf)
2494 cb_args_t *args = (cb_args_t *) user;
2495 capture_file *cf = args->cf;
2498 print_args_t print_args;
2499 epan_dissect_t *edt;
2500 gboolean create_proto_tree;
2505 fill_in_fdata(&fdata, cf, phdr, offset);
2507 /* Grab any resolved addresses */
2508 if (g_resolv_flags) {
2509 host_name_lookup_process(NULL);
2513 if (cf->rfcode || verbose || num_tap_filters!=0)
2514 create_proto_tree = TRUE;
2516 create_proto_tree = FALSE;
2517 /* The protocol tree will be "visible", i.e., printed, only if we're
2518 not printing a summary.
2520 We only need the columns if we're *not* verbose; in verbose mode,
2521 we print the protocol tree, not the protocol summary. */
2523 edt = epan_dissect_new(create_proto_tree, verbose);
2525 epan_dissect_prime_dfilter(edt, cf->rfcode);
2528 tap_queue_init(edt);
2529 epan_dissect_run(edt, pseudo_header, buf, &fdata, verbose ? NULL : &cf->cinfo);
2530 tap_push_tapped_queue(edt);
2533 passed = dfilter_apply_edt(cf->rfcode, edt);
2536 /* The packet passed the read filter. */
2541 /* Print the information in the protocol tree. */
2542 print_args.to_file = TRUE;
2543 print_args.format = print_format;
2544 print_args.print_summary = FALSE;
2545 print_args.print_hex = print_hex;
2546 print_args.print_dissections = print_dissections_expanded;
2547 print_args.print_range = print_range_all_captured;
2548 proto_tree_print(&print_args, edt, stdout);
2550 /* "print_hex_data()" will put out a leading blank line, as well
2551 as a trailing one; print one here, to separate the packets,
2552 only if "print_hex_data()" won't be called. */
2556 /* Just fill in the columns. */
2557 epan_dissect_fill_in_columns(edt);
2559 /* Now print them. */
2560 for (i = 0; i < cf->cinfo.num_cols; i++) {
2561 switch (cf->cinfo.col_fmt[i]) {
2564 * Don't print this if we're doing a live capture from a network
2565 * interface - if we're doing a live capture, you won't be
2566 * able to look at the capture in the future (it's not being
2567 * saved anywhere), so the frame numbers are unlikely to be
2570 * (XXX - it might be nice to be able to save and print at
2571 * the same time, sort of like an "Update list of packets
2572 * in real time" capture in Ethereal.)
2574 if (cf->iface != NULL)
2576 printf("%3s", cf->cinfo.col_data[i]);
2582 case COL_ABS_DATE_TIME: /* XXX - wider */
2583 printf("%10s", cf->cinfo.col_data[i]);
2589 case COL_DEF_DL_SRC:
2590 case COL_RES_DL_SRC:
2591 case COL_UNRES_DL_SRC:
2592 case COL_DEF_NET_SRC:
2593 case COL_RES_NET_SRC:
2594 case COL_UNRES_NET_SRC:
2595 printf("%12s", cf->cinfo.col_data[i]);
2601 case COL_DEF_DL_DST:
2602 case COL_RES_DL_DST:
2603 case COL_UNRES_DL_DST:
2604 case COL_DEF_NET_DST:
2605 case COL_RES_NET_DST:
2606 case COL_UNRES_NET_DST:
2607 printf("%-12s", cf->cinfo.col_data[i]);
2611 printf("%s", cf->cinfo.col_data[i]);
2614 if (i != cf->cinfo.num_cols - 1) {
2616 * This isn't the last column, so we need to print a
2617 * separator between this column and the next.
2619 * If we printed a network source and are printing a
2620 * network destination of the same type next, separate
2621 * them with "->"; if we printed a network destination
2622 * and are printing a network source of the same type
2623 * next, separate them with "<-"; otherwise separate them
2626 switch (cf->cinfo.col_fmt[i]) {
2631 switch (cf->cinfo.col_fmt[i + 1]) {
2645 case COL_DEF_DL_SRC:
2646 case COL_RES_DL_SRC:
2647 case COL_UNRES_DL_SRC:
2648 switch (cf->cinfo.col_fmt[i + 1]) {
2650 case COL_DEF_DL_DST:
2651 case COL_RES_DL_DST:
2652 case COL_UNRES_DL_DST:
2662 case COL_DEF_NET_SRC:
2663 case COL_RES_NET_SRC:
2664 case COL_UNRES_NET_SRC:
2665 switch (cf->cinfo.col_fmt[i + 1]) {
2667 case COL_DEF_NET_DST:
2668 case COL_RES_NET_DST:
2669 case COL_UNRES_NET_DST:
2682 switch (cf->cinfo.col_fmt[i + 1]) {
2696 case COL_DEF_DL_DST:
2697 case COL_RES_DL_DST:
2698 case COL_UNRES_DL_DST:
2699 switch (cf->cinfo.col_fmt[i + 1]) {
2701 case COL_DEF_DL_SRC:
2702 case COL_RES_DL_SRC:
2703 case COL_UNRES_DL_SRC:
2713 case COL_DEF_NET_DST:
2714 case COL_RES_NET_DST:
2715 case COL_UNRES_NET_DST:
2716 switch (cf->cinfo.col_fmt[i + 1]) {
2718 case COL_DEF_NET_SRC:
2719 case COL_RES_NET_SRC:
2720 case COL_UNRES_NET_SRC:
2739 print_hex_data(stdout, print_args.format, edt);
2744 /* The ANSI C standard does not appear to *require* that a line-buffered
2745 stream be flushed to the host environment whenever a newline is
2746 written, it just says that, on such a stream, characters "are
2747 intended to be transmitted to or from the host environment as a
2748 block when a new-line character is encountered".
2750 The Visual C++ 6.0 C implementation doesn't do what is intended;
2751 even if you set a stream to be line-buffered, it still doesn't
2752 flush the buffer at the end of every line.
2754 So, if the "-l" flag was specified, we flush the standard output
2755 at the end of a packet. This will do the right thing if we're
2756 printing packet summary lines, and, as we print the entire protocol
2757 tree for a single packet without waiting for anything to happen,
2758 it should be as good as line-buffered mode if we're printing
2759 protocol trees. (The whole reason for the "-l" flag in either
2760 tcpdump or Tethereal is to allow the output of a live capture to
2761 be piped to a program or script and to have that script see the
2762 information for the packet as soon as it's printed, rather than
2763 having to wait until a standard I/O buffer fills up. */
2767 epan_dissect_free(edt);
2769 clear_fdata(&fdata);
2773 file_open_error_message(int err, gboolean for_writing, int file_type)
2776 static char errmsg_errno[1024+1];
2780 case WTAP_ERR_NOT_REGULAR_FILE:
2781 errmsg = "The file \"%s\" is a \"special file\" or socket or other non-regular file.";
2784 case WTAP_ERR_FILE_UNKNOWN_FORMAT:
2785 case WTAP_ERR_UNSUPPORTED:
2786 /* Seen only when opening a capture file for reading. */
2787 errmsg = "The file \"%s\" is not a capture file in a format Tethereal understands.";
2790 case WTAP_ERR_CANT_WRITE_TO_PIPE:
2791 /* Seen only when opening a capture file for writing. */
2792 snprintf(errmsg_errno, sizeof(errmsg_errno),
2793 "The file \"%%s\" is a pipe, and %s capture files cannot be "
2794 "written to a pipe.", wtap_file_type_string(file_type));
2795 errmsg = errmsg_errno;
2798 case WTAP_ERR_UNSUPPORTED_FILE_TYPE:
2799 /* Seen only when opening a capture file for writing. */
2800 errmsg = "Tethereal does not support writing capture files in that format.";
2803 case WTAP_ERR_UNSUPPORTED_ENCAP:
2804 case WTAP_ERR_ENCAP_PER_PACKET_UNSUPPORTED:
2806 errmsg = "Tethereal cannot save this capture in that format.";
2808 errmsg = "The file \"%s\" is a capture for a network type that Tethereal doesn't support.";
2811 case WTAP_ERR_BAD_RECORD:
2812 errmsg = "The file \"%s\" appears to be damaged or corrupt.";
2815 case WTAP_ERR_CANT_OPEN:
2817 errmsg = "The file \"%s\" could not be created for some unknown reason.";
2819 errmsg = "The file \"%s\" could not be opened for some unknown reason.";
2822 case WTAP_ERR_SHORT_READ:
2823 errmsg = "The file \"%s\" appears to have been cut short"
2824 " in the middle of a packet or other data.";
2827 case WTAP_ERR_SHORT_WRITE:
2828 errmsg = "A full header couldn't be written to the file \"%s\".";
2833 errmsg = "The path to the file \"%s\" does not exist.";
2835 errmsg = "The file \"%s\" does not exist.";
2840 errmsg = "You do not have permission to create or write to the file \"%s\".";
2842 errmsg = "You do not have permission to read the file \"%s\".";
2846 errmsg = "\"%s\" is a directory (folder), not a file.";
2850 snprintf(errmsg_errno, sizeof(errmsg_errno),
2851 "The file \"%%s\" could not be %s: %s.",
2852 for_writing ? "created" : "opened",
2853 wtap_strerror(err));
2854 errmsg = errmsg_errno;
2861 cf_open(char *fname, gboolean is_tempfile, capture_file *cf)
2865 char err_msg[2048+1];
2867 wth = wtap_open_offline(fname, &err, FALSE);
2871 /* The open succeeded. Fill in the information for this file. */
2873 /* Initialize all data structures used for dissection. */
2877 cf->filed = -1; /* not used, but set it anyway */
2878 cf->f_len = 0; /* not used, but set it anyway */
2880 /* Set the file name because we need it to set the follow stream filter.
2881 XXX - is that still true? We need it for other reasons, though,
2883 cf->filename = g_strdup(fname);
2885 /* Indicate whether it's a permanent or temporary file. */
2886 cf->is_tempfile = is_tempfile;
2888 /* If it's a temporary capture buffer file, mark it as not saved. */
2889 cf->user_saved = !is_tempfile;
2891 cf->cd_t = wtap_file_type(cf->wth);
2893 cf->drops_known = FALSE;
2897 cf->snap = wtap_snapshot_length(cf->wth);
2898 if (cf->snap == 0) {
2899 /* Snapshot length not known. */
2900 cf->has_snap = FALSE;
2901 cf->snap = WTAP_MAX_PACKET_SIZE;
2903 cf->has_snap = TRUE;
2904 cf->progbar_quantum = 0;
2905 cf->progbar_nextstep = 0;
2906 firstsec = 0, firstusec = 0;
2907 prevsec = 0, prevusec = 0;
2912 snprintf(err_msg, sizeof err_msg, file_open_error_message(err, FALSE, 0),
2914 fprintf(stderr, "tethereal: %s\n", err_msg);
2920 /* Take care of byte order in the libpcap headers read from pipes.
2921 * (function taken from wiretap/libpcap.c) */
2923 adjust_header(loop_data *ld, struct pcap_hdr *hdr, struct pcaprec_hdr *rechdr)
2925 if (ld->byte_swapped) {
2926 /* Byte-swap the record header fields. */
2927 rechdr->ts_sec = BSWAP32(rechdr->ts_sec);
2928 rechdr->ts_usec = BSWAP32(rechdr->ts_usec);
2929 rechdr->incl_len = BSWAP32(rechdr->incl_len);
2930 rechdr->orig_len = BSWAP32(rechdr->orig_len);
2933 /* In file format version 2.3, the "incl_len" and "orig_len" fields were
2934 swapped, in order to match the BPF header layout.
2936 Unfortunately, some files were, according to a comment in the "libpcap"
2937 source, written with version 2.3 in their headers but without the
2938 interchanged fields, so if "incl_len" is greater than "orig_len" - which
2939 would make no sense - we assume that we need to swap them. */
2940 if (hdr->version_major == 2 &&
2941 (hdr->version_minor < 3 ||
2942 (hdr->version_minor == 3 && rechdr->incl_len > rechdr->orig_len))) {
2945 temp = rechdr->orig_len;
2946 rechdr->orig_len = rechdr->incl_len;
2947 rechdr->incl_len = temp;
2951 /* Mimic pcap_open_live() for pipe captures
2952 * We check if "pipename" is "-" (stdin) or a FIFO, open it, and read the
2954 * N.B. : we can't read the libpcap formats used in RedHat 6.1 or SuSE 6.3
2955 * because we can't seek on pipes (see wiretap/libpcap.c for details) */
2957 pipe_open_live(char *pipename, struct pcap_hdr *hdr, loop_data *ld,
2958 char *errmsg, int errmsgl)
2960 struct stat pipe_stat;
2964 unsigned int bytes_read;
2967 * XXX Tethereal blocks until we return
2969 if (strcmp(pipename, "-") == 0)
2970 fd = 0; /* read from stdin */
2972 if (stat(pipename, &pipe_stat) < 0) {
2973 if (errno == ENOENT || errno == ENOTDIR)
2974 ld->pipe_err = PIPNEXIST;
2976 snprintf(errmsg, errmsgl,
2977 "The capture session could not be initiated "
2978 "due to error on pipe: %s", strerror(errno));
2979 ld->pipe_err = PIPERR;
2983 if (! S_ISFIFO(pipe_stat.st_mode)) {
2984 if (S_ISCHR(pipe_stat.st_mode)) {
2986 * Assume the user specified an interface on a system where
2987 * interfaces are in /dev. Pretend we haven't seen it.
2989 ld->pipe_err = PIPNEXIST;
2991 snprintf(errmsg, errmsgl,
2992 "The capture session could not be initiated because\n"
2993 "\"%s\" is neither an interface nor a pipe", pipename);
2994 ld->pipe_err = PIPERR;
2998 fd = open(pipename, O_RDONLY);
3000 snprintf(errmsg, errmsgl,
3001 "The capture session could not be initiated "
3002 "due to error on pipe open: %s", strerror(errno));
3003 ld->pipe_err = PIPERR;
3008 ld->from_pipe = TRUE;
3010 /* read the pcap header */
3012 while (bytes_read < sizeof magic) {
3013 b = read(fd, ((char *)&magic)+bytes_read, sizeof magic-bytes_read);
3016 snprintf(errmsg, errmsgl, "End of file on pipe during open");
3018 snprintf(errmsg, errmsgl, "Error on pipe during open: %s",
3027 /* Host that wrote it has our byte order, and was running
3028 a program using either standard or ss990417 libpcap. */
3029 ld->byte_swapped = FALSE;
3030 ld->modified = FALSE;
3032 case PCAP_MODIFIED_MAGIC:
3033 /* Host that wrote it has our byte order, but was running
3034 a program using either ss990915 or ss991029 libpcap. */
3035 ld->byte_swapped = FALSE;
3036 ld->modified = TRUE;
3038 case PCAP_SWAPPED_MAGIC:
3039 /* Host that wrote it has a byte order opposite to ours,
3040 and was running a program using either standard or
3041 ss990417 libpcap. */
3042 ld->byte_swapped = TRUE;
3043 ld->modified = FALSE;
3045 case PCAP_SWAPPED_MODIFIED_MAGIC:
3046 /* Host that wrote it out has a byte order opposite to
3047 ours, and was running a program using either ss990915
3048 or ss991029 libpcap. */
3049 ld->byte_swapped = TRUE;
3050 ld->modified = TRUE;
3053 /* Not a "libpcap" type we know about. */
3054 snprintf(errmsg, errmsgl, "Unrecognized libpcap format");
3058 /* Read the rest of the header */
3060 while (bytes_read < sizeof(struct pcap_hdr)) {
3061 b = read(fd, ((char *)hdr)+bytes_read,
3062 sizeof(struct pcap_hdr) - bytes_read);
3065 snprintf(errmsg, errmsgl, "End of file on pipe during open");
3067 snprintf(errmsg, errmsgl, "Error on pipe during open: %s",
3074 if (ld->byte_swapped) {
3075 /* Byte-swap the header fields about which we care. */
3076 hdr->version_major = BSWAP16(hdr->version_major);
3077 hdr->version_minor = BSWAP16(hdr->version_minor);
3078 hdr->snaplen = BSWAP32(hdr->snaplen);
3079 hdr->network = BSWAP32(hdr->network);
3082 if (hdr->version_major < 2) {
3083 snprintf(errmsg, errmsgl, "Unable to read old libpcap format");
3087 ld->pipe_state = STATE_EXPECT_REC_HDR;
3088 ld->pipe_err = PIPOK;
3092 ld->pipe_err = PIPERR;
3097 /* We read one record from the pipe, take care of byte order in the record
3098 * header, write the record in the capture file, and update capture statistics. */
3101 pipe_dispatch(int fd, loop_data *ld, struct pcap_hdr *hdr,
3102 struct pcaprec_modified_hdr *rechdr, guchar *data,
3103 char *errmsg, int errmsgl)
3105 struct pcap_pkthdr phdr;
3107 enum { PD_REC_HDR_READ, PD_DATA_READ, PD_PIPE_EOF, PD_PIPE_ERR,
3110 switch (ld->pipe_state) {
3112 case STATE_EXPECT_REC_HDR:
3113 ld->bytes_to_read = ld->modified ?
3114 sizeof(struct pcaprec_modified_hdr) : sizeof(struct pcaprec_hdr);
3116 ld->pipe_state = STATE_READ_REC_HDR;
3119 case STATE_READ_REC_HDR:
3120 b = read(fd, ((char *)rechdr)+ld->bytes_read,
3121 ld->bytes_to_read - ld->bytes_read);
3124 result = PD_PIPE_EOF;
3126 result = PD_PIPE_ERR;
3129 if ((ld->bytes_read += b) < ld->bytes_to_read)
3131 result = PD_REC_HDR_READ;
3134 case STATE_EXPECT_DATA:
3136 ld->pipe_state = STATE_READ_DATA;
3139 case STATE_READ_DATA:
3140 b = read(fd, data+ld->bytes_read, rechdr->hdr.incl_len - ld->bytes_read);
3143 result = PD_PIPE_EOF;
3145 result = PD_PIPE_ERR;
3148 if ((ld->bytes_read += b) < rechdr->hdr.incl_len)
3150 result = PD_DATA_READ;
3154 snprintf(errmsg, errmsgl, "pipe_dispatch: invalid state");
3157 } /* switch (ld->pipe_state) */
3160 * We've now read as much data as we were expecting, so process it.
3164 case PD_REC_HDR_READ:
3165 /* We've read the header. Take care of byte order. */
3166 adjust_header(ld, hdr, &rechdr->hdr);
3167 if (rechdr->hdr.incl_len > WTAP_MAX_PACKET_SIZE) {
3168 snprintf(errmsg, errmsgl, "Frame %u too long (%d bytes)",
3169 ld->packet_count+1, rechdr->hdr.incl_len);
3172 ld->pipe_state = STATE_EXPECT_DATA;
3176 /* Fill in a "struct pcap_pkthdr", and process the packet. */
3177 phdr.ts.tv_sec = rechdr->hdr.ts_sec;
3178 phdr.ts.tv_usec = rechdr->hdr.ts_usec;
3179 phdr.caplen = rechdr->hdr.incl_len;
3180 phdr.len = rechdr->hdr.orig_len;
3182 capture_pcap_cb((guchar *)ld, &phdr, data);
3184 ld->pipe_state = STATE_EXPECT_REC_HDR;
3188 ld->pipe_err = PIPEOF;
3192 snprintf(errmsg, errmsgl, "Error reading from pipe: %s",
3199 ld->pipe_err = PIPERR;
3200 /* Return here rather than inside the switch to prevent GCC warning */
3204 #endif /* HAVE_LIBPCAP */