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.
27 /* With MSVC and a libethereal.dll this file needs to import some variables
28 in a special way. Therefore _NEED_VAR_IMPORT_ is defined. */
29 #define _NEED_VAR_IMPORT_
59 #ifdef HAVE_SYS_STAT_H
60 # include <sys/stat.h>
63 #ifdef NEED_SNPRINTF_H
64 # include "snprintf.h"
67 #ifdef NEED_STRERROR_H
75 #include "svnversion.h"
78 #include <epan/epan.h>
79 #include <epan/filesystem.h>
82 #include <epan/timestamp.h>
83 #include <epan/packet.h>
85 #include "disabled_protos.h"
86 #include <epan/prefs.h>
87 #include <epan/column.h>
89 #include <epan/addr_resolv.h>
91 #include "clopts_common.h"
92 #include "version_info.h"
94 #include "pcap-util.h"
96 #include <epan/conversation.h>
97 #include <epan/plugins.h>
99 #include "conditions.h"
100 #include "capture_stop_conditions.h"
101 #include "ringbuffer.h"
102 #include "capture_ui_utils.h"
103 #include <epan/epan_dissect.h>
104 #include <epan/tap.h>
105 #include <epan/timestamp.h>
108 #include <wiretap/wtap-capture.h>
109 #include <wiretap/libpcap.h>
113 #include "capture-wpcap.h"
117 * This is the template for the decode as option; it is shared between the
118 * various functions that output the usage for this parameter.
120 static const gchar decode_as_arg_template[] = "<layer_type>==<selector>,<decode_as_protocol>";
122 static guint32 firstsec, firstusec;
123 static guint32 prevsec, prevusec;
124 static GString *comp_info_str, *runtime_info_str;
125 static gboolean quiet;
127 static gboolean print_packet_info; /* TRUE if we're to print packet information */
129 * The way the packet decode is to be written.
132 WRITE_TEXT, /* summary or detail text */
133 WRITE_XML /* PDML or PSML */
134 /* Add CSV and the like here */
136 static output_action_e output_action;
137 static gboolean do_dissection; /* TRUE if we have to dissect each packet */
138 static gboolean verbose;
139 static gboolean print_hex;
140 static gboolean line_buffered;
141 static guint32 cum_bytes = 0;
142 static print_format_e print_format = PR_FMT_TEXT;
143 static print_stream_t *print_stream;
146 typedef struct _loop_data {
147 gboolean go; /* TRUE as long as we're supposed to keep capturing */
149 gboolean from_pipe; /* TRUE if we are capturing data from a pipe */
153 gboolean output_to_pipe;
156 gboolean modified; /* TRUE if data in the pipe uses modified pcap headers */
157 gboolean byte_swapped; /* TRUE if data in the pipe is byte swapped */
158 unsigned int bytes_to_read, bytes_read; /* Used by pipe_dispatch */
160 STATE_EXPECT_REC_HDR, STATE_READ_REC_HDR,
161 STATE_EXPECT_DATA, STATE_READ_DATA
164 enum { PIPOK, PIPEOF, PIPERR, PIPNEXIST } pipe_err;
172 gchar *save_file; /* File that user saved capture to */
173 int snaplen; /* Maximum captured packet length */
174 int promisc_mode; /* Capture in promiscuous mode */
175 int autostop_count; /* Maximum packet count */
176 gboolean has_autostop_duration; /* TRUE if maximum capture duration
178 gint32 autostop_duration; /* Maximum capture duration */
179 gboolean has_autostop_filesize; /* TRUE if maximum capture file size
181 gint32 autostop_filesize; /* Maximum capture file size */
182 gboolean ringbuffer_on; /* TRUE if ring buffer in use */
183 guint32 ringbuffer_num_files; /* Number of ring buffer files */
184 gboolean has_ring_duration; /* TRUE if ring duration specified */
185 gint32 ringbuffer_duration; /* Switch file after n seconds */
186 int linktype; /* Data link type to use, or -1 for
190 static capture_options capture_opts = {
192 WTAP_MAX_PACKET_SIZE, /* snapshot length - default is
193 infinite, in effect */
194 TRUE, /* promiscuous mode is the default */
195 0, /* max packet count - default is 0,
197 FALSE, /* maximum capture duration not
198 specified by default */
199 0, /* maximum capture duration */
200 FALSE, /* maximum capture file size not
201 specified by default */
202 0, /* maximum capture file size */
203 FALSE, /* ring buffer off by default */
204 RINGBUFFER_MIN_NUM_FILES, /* default number of ring buffer
206 FALSE, /* Switch ring file after some */
207 0, /* specified time is off by default */
208 -1 /* Default to not change link type */
211 static gboolean list_link_layer_types;
214 static gboolean infodelay; /* if TRUE, don't print capture info in SIGINFO handler */
215 static gboolean infoprint; /* if TRUE, print capture info after clearing infodelay */
217 #endif /* HAVE_LIBPCAP */
220 static int capture(int);
221 static void capture_pcap_cb(guchar *, const struct pcap_pkthdr *,
223 static void report_counts(void);
225 static BOOL WINAPI capture_cleanup(DWORD);
227 static void capture_cleanup(int);
229 static void report_counts_siginfo(int);
232 #endif /* HAVE_LIBPCAP */
234 static int load_cap_file(capture_file *, capture_options *capture_opts, int);
235 static gboolean process_packet(capture_file *cf, wtap_dumper *pdh, long offset,
236 const struct wtap_pkthdr *whdr, union wtap_pseudo_header *pseudo_header,
237 const guchar *pd, int *err);
238 static void show_capture_file_io_error(const char *, int, gboolean);
239 static void show_print_file_io_error(int err);
240 static gboolean write_preamble(capture_file *cf);
241 static gboolean print_packet(capture_file *cf, epan_dissect_t *edt);
242 static gboolean write_finale(void);
243 static char *cf_open_error_message(int err, gchar *err_info,
244 gboolean for_writing, int file_type);
247 static void adjust_header(loop_data *, struct pcap_hdr *, struct pcaprec_hdr *);
248 static int pipe_open_live(char *, struct pcap_hdr *, loop_data *, char *, int);
249 static int pipe_dispatch(int, loop_data *, struct pcap_hdr *, \
250 struct pcaprec_modified_hdr *, guchar *, char *, int);
254 static void open_failure_message(const char *filename, int err,
255 gboolean for_writing);
256 static void failure_message(const char *msg_format, va_list ap);
257 static void read_failure_message(const char *filename, int err);
263 print_usage(gboolean print_ver)
270 fprintf(output, "This is GNU t" PACKAGE " " VERSION
274 "\n (C) 1998-2004 Gerald Combs <gerald@ethereal.com>"
277 comp_info_str->str, runtime_info_str->str);
282 fprintf(output, "\nt%s [ -vh ] [ -DlLnpqSVx ] [ -a <capture autostop condition> ] ...\n",
284 fprintf(output, "\t[ -b <number of ring buffer files>[:<duration>] ] [ -c <count> ]\n");
285 fprintf(output, "\t[ -d %s ] ...\n", decode_as_arg_template);
286 fprintf(output, "\t[ -f <capture filter> ] [ -F <output file type> ] [ -i <interface> ]\n");
287 fprintf(output, "\t[ -N <resolving> ] [ -o <preference setting> ] ... [ -r <infile> ]\n");
288 fprintf(output, "\t[ -R <read filter> ] [ -s <snaplen> ] [ -t <time stamp format> ]\n");
289 fprintf(output, "\t[ -T pdml|ps|psml|text ] [ -w <savefile> ] [ -y <link type> ]\n");
290 fprintf(output, "\t[ -z <statistics string> ]\n");
292 fprintf(output, "\nt%s [ -vh ] [ -lnVx ]\n", PACKAGE);
293 fprintf(output, "\t[ -d %s ] ...\n", decode_as_arg_template);
294 fprintf(output, "\t[ -F <output file type> ] [ -N <resolving> ]\n");
295 fprintf(output, "\t[ -o <preference setting> ] ... [ -r <infile> ] [ -R <read filter> ]\n");
296 fprintf(output, "\t[ -t <time stamp format> ] [ -T pdml|ps|psml|text ] [ -w <savefile> ]\n");
297 fprintf(output, "\t[ -z <statistics string> ]\n");
299 fprintf(output, "Valid file type arguments to the \"-F\" flag:\n");
300 for (i = 0; i < WTAP_NUM_FILE_TYPES; i++) {
301 if (wtap_dump_can_open(i))
302 fprintf(output, "\t%s - %s\n",
303 wtap_file_type_short_string(i), wtap_file_type_string(i));
305 fprintf(output, "\tdefault is libpcap\n");
310 get_natural_int(const char *string, const char *name)
315 number = strtol(string, &p, 10);
316 if (p == string || *p != '\0') {
317 fprintf(stderr, "tethereal: The specified %s \"%s\" isn't a decimal number\n",
322 fprintf(stderr, "tethereal: The specified %s is a negative number\n",
326 if (number > INT_MAX) {
327 fprintf(stderr, "tethereal: The specified %s is too large (greater than %d)\n",
335 get_positive_int(const char *string, const char *name)
339 number = get_natural_int(string, name);
342 fprintf(stderr, "tethereal: The specified %s is zero\n",
351 * Given a string of the form "<autostop criterion>:<value>", as might appear
352 * as an argument to a "-a" option, parse it and set the criterion in
353 * question. Return an indication of whether it succeeded or failed
357 set_autostop_criterion(const char *autostoparg)
361 colonp = strchr(autostoparg, ':');
369 * Skip over any white space (there probably won't be any, but
370 * as we allow it in the preferences file, we might as well
377 * Put the colon back, so if our caller uses, in an
378 * error message, the string they passed us, the message
384 if (strcmp(autostoparg,"duration") == 0) {
385 capture_opts.has_autostop_duration = TRUE;
386 capture_opts.autostop_duration = get_positive_int(p,"autostop duration");
387 } else if (strcmp(autostoparg,"filesize") == 0) {
388 capture_opts.has_autostop_filesize = TRUE;
389 capture_opts.autostop_filesize = get_positive_int(p,"autostop filesize");
393 *colonp = ':'; /* put the colon back */
398 * Given a string of the form "<ring buffer file>:<duration>", as might appear
399 * as an argument to a "-b" option, parse it and set the arguments in
400 * question. Return an indication of whether it succeeded or failed
404 get_ring_arguments(const char *arg)
406 guchar *p = NULL, *colonp;
408 colonp = strchr(arg, ':');
410 if (colonp != NULL) {
415 capture_opts.ringbuffer_num_files =
416 get_natural_int(arg, "number of ring buffer files");
422 * Skip over any white space (there probably won't be any, but
423 * as we allow it in the preferences file, we might as well
430 * Put the colon back, so if our caller uses, in an
431 * error message, the string they passed us, the message
438 capture_opts.has_ring_duration = TRUE;
439 capture_opts.ringbuffer_duration = get_positive_int(p,
440 "ring buffer duration");
442 *colonp = ':'; /* put the colon back */
447 /* structure to keep track of what tap listeners have been registered.
449 typedef struct _ethereal_tap_list {
450 struct _ethereal_tap_list *next;
452 void (*func)(char *arg);
454 static ethereal_tap_list *tap_list=NULL;
457 register_ethereal_tap(char *cmd, void (*func)(char *arg))
459 ethereal_tap_list *newtl;
461 newtl=malloc(sizeof(ethereal_tap_list));
462 newtl->next=tap_list;
470 * For a dissector table, print on the stream described by output,
471 * its short name (which is what's used in the "-d" option) and its
475 display_dissector_table_names(char *table_name, char *ui_name, gpointer output)
477 fprintf((FILE *)output, "\t%s (%s)\n", table_name, ui_name);
481 * For a dissector handle, print on the stream described by output,
482 * the filter name (which is what's used in the "-d" option) and the full
483 * name for the protocol that corresponds to this handle.
486 display_dissector_names(gchar *table _U_, gpointer handle, gpointer output)
489 const gchar* proto_filter_name;
490 const gchar* proto_ui_name;
492 proto_id = dissector_handle_get_protocol_index((dissector_handle_t)handle);
494 if (proto_id != -1) {
495 proto_filter_name = proto_get_protocol_filter_name(proto_id);
496 proto_ui_name = proto_get_protocol_name(proto_id);
497 g_assert(proto_filter_name != NULL);
498 g_assert(proto_ui_name != NULL);
500 fprintf((FILE *)output, "\t%s (%s)\n",
507 * The protocol_name_search structure is used by find_protocol_name_func()
508 * to pass parameters and store results
510 struct protocol_name_search{
511 gchar *searched_name; /* Protocol filter name we are looking for */
512 dissector_handle_t matched_handle; /* Handle for a dissector whose protocol has the specified filter name */
513 guint nb_match; /* How many dissectors matched searched_name */
515 typedef struct protocol_name_search *protocol_name_search_t;
518 * This function parses all dissectors associated with a table to find the
519 * one whose protocol has the specified filter name. It is called
520 * as a reference function in a call to dissector_table_foreach_handle.
521 * The name we are looking for, as well as the results, are stored in the
522 * protocol_name_search struct pointed to by user_data.
523 * If called using dissector_table_foreach_handle, we actually parse the
524 * whole list of dissectors.
527 find_protocol_name_func(gchar *table _U_, gpointer handle, gpointer user_data)
531 const gchar *protocol_filter_name;
532 protocol_name_search_t search_info;
536 search_info = (protocol_name_search_t)user_data;
538 proto_id = dissector_handle_get_protocol_index((dissector_handle_t)handle);
539 if (proto_id != -1) {
540 protocol_filter_name = proto_get_protocol_filter_name(proto_id);
541 g_assert(protocol_filter_name != NULL);
542 if (strcmp(protocol_filter_name, search_info->searched_name) == 0) {
544 if (search_info->nb_match == 0) {
545 /* Record this handle only if this is the first match */
546 search_info->matched_handle = (dissector_handle_t)handle; /* Record the handle for this matching dissector */
548 search_info->nb_match++;
554 * Print all layer type names supported.
555 * We send the output to the stream described by the handle output.
559 fprint_all_layer_types(FILE *output)
562 dissector_all_tables_foreach_table(display_dissector_table_names, (gpointer)output);
566 * Print all protocol names supported for a specific layer type.
567 * table_name contains the layer type name in which the search is performed.
568 * We send the output to the stream described by the handle output.
572 fprint_all_protocols_for_layer_types(FILE *output, gchar *table_name)
575 dissector_table_foreach_handle(table_name,
576 display_dissector_names,
581 * The function below parses the command-line parameters for the decode as
582 * feature (a string pointer by cl_param).
583 * It checks the format of the command-line, searches for a matching table
584 * and dissector. If a table/dissector match is not found, we display a
585 * summary of the available tables/dissectors (on stderr) and return FALSE.
586 * If everything is fine, we get the "Decode as" preference activated,
587 * then we return TRUE.
590 add_decode_as(const gchar *cl_param)
594 gchar *decoded_param;
595 gchar *remaining_param;
597 gchar *dissector_str;
598 dissector_handle_t dissector_matching;
599 dissector_table_t table_matching;
600 ftenum_t dissector_table_selector_type;
601 struct protocol_name_search user_protocol_name;
603 /* The following code will allocate and copy the command-line options in a string pointed by decoded_param */
606 decoded_param = g_malloc( sizeof(gchar) * (strlen(cl_param) + 1) ); /* Allocate enough space to have a working copy of the command-line parameter */
607 g_assert(decoded_param);
608 strcpy(decoded_param, cl_param);
611 /* The lines below will parse this string (modifying it) to extract all
612 necessary information. Note that decoded_param is still needed since
613 strings are not copied - we just save pointers. */
615 /* This section extracts a layer type (table_name) from decoded_param */
616 table_name = decoded_param; /* Layer type string starts from beginning */
618 remaining_param = strchr(table_name, '=');
619 if (remaining_param == NULL) {
620 fprintf(stderr, "tethereal: Parameter \"%s\" doesn't follow the template \"%s\"\n", cl_param, decode_as_arg_template);
621 /* If the argument does not follow the template, carry on anyway to check
622 if the table name is at least correct. If remaining_param is NULL,
623 we'll exit anyway further down */
626 *remaining_param = '\0'; /* Terminate the layer type string (table_name) where '=' was detected */
629 /* Remove leading and trailing spaces from the table name */
630 while ( table_name[0] == ' ' )
632 while ( table_name[strlen(table_name) - 1] == ' ' )
633 table_name[strlen(table_name) - 1] = '\0'; /* Note: if empty string, while loop will eventually exit */
635 /* The following part searches a table matching with the layer type specified */
636 table_matching = NULL;
638 /* Look for the requested table */
639 if ( !(*(table_name)) ) { /* Is the table name empty, if so, don't even search for anything, display a message */
640 fprintf(stderr, "tethereal: No layer type specified\n"); /* Note, we don't exit here, but table_matching will remain NULL, so we exit below */
643 table_matching = find_dissector_table(table_name);
644 if (!table_matching) {
645 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 */
649 if (!table_matching) {
650 /* Display a list of supported layer types to help the user, if the
651 specified layer type was not found */
652 fprintf(stderr, "tethereal: Valid layer types are:\n");
653 fprint_all_layer_types(stderr);
655 if (remaining_param == NULL || !table_matching) {
656 /* Exit if the layer type was not found, or if no '=' separator was found
658 g_free(decoded_param);
662 if (*(remaining_param + 1) != '=') { /* Check for "==" and not only '=' */
663 fprintf(stderr, "tethereal: WARNING: -d requires \"==\" instead of \"=\". Option will be treated as \"%s==%s\"\n", table_name, remaining_param + 1);
666 remaining_param++; /* Move to the second '=' */
667 *remaining_param = '\0'; /* Remove the second '=' */
669 remaining_param++; /* Position after the layer type string */
671 /* This section extracts a selector value (selector_str) from decoded_param */
673 selector_str = remaining_param; /* Next part starts with the selector number */
675 remaining_param = strchr(selector_str, ',');
676 if (remaining_param == NULL) {
677 fprintf(stderr, "tethereal: Parameter \"%s\" doesn't follow the template \"%s\"\n", cl_param, decode_as_arg_template);
678 /* If the argument does not follow the template, carry on anyway to check
679 if the selector value is at least correct. If remaining_param is NULL,
680 we'll exit anyway further down */
683 *remaining_param = '\0'; /* Terminate the selector number string (selector_str) where ',' was detected */
686 dissector_table_selector_type = get_dissector_table_selector_type(table_name);
688 switch (dissector_table_selector_type) {
694 /* The selector for this table is an unsigned number. Parse it as such.
695 There's no need to remove leading and trailing spaces from the
696 selector number string, because sscanf will do that for us. */
697 if ( sscanf(selector_str, "%u", &selector) != 1 ) {
698 fprintf(stderr, "tethereal: Invalid selector number \"%s\"\n", selector_str);
699 g_free(decoded_param);
706 /* The selector for this table is a string. */
710 /* There are currently no dissector tables with any types other
711 than the ones listed above. */
712 g_assert_not_reached();
715 if (remaining_param == NULL) {
716 /* Exit if no ',' separator was found (see above) */
717 fprintf(stderr, "tethereal: Valid protocols for layer type \"%s\" are:\n", table_name);
718 fprint_all_protocols_for_layer_types(stderr, table_name);
719 g_free(decoded_param);
723 remaining_param++; /* Position after the selector number string */
725 /* This section extracts a protocol filter name (dissector_str) from decoded_param */
727 dissector_str = remaining_param; /* All the rest of the string is the dissector (decode as protocol) name */
729 /* Remove leading and trailing spaces from the dissector name */
730 while ( dissector_str[0] == ' ' )
732 while ( dissector_str[strlen(dissector_str) - 1] == ' ' )
733 dissector_str[strlen(dissector_str) - 1] = '\0'; /* Note: if empty string, while loop will eventually exit */
735 dissector_matching = NULL;
737 /* We now have a pointer to the handle for the requested table inside the variable table_matching */
738 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 */
739 fprintf(stderr, "tethereal: No protocol name specified\n"); /* Note, we don't exit here, but dissector_matching will remain NULL, so we exit below */
742 user_protocol_name.nb_match = 0;
743 user_protocol_name.searched_name = dissector_str;
744 user_protocol_name.matched_handle = NULL;
746 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 */
748 if (user_protocol_name.nb_match != 0) {
749 dissector_matching = user_protocol_name.matched_handle;
750 if (user_protocol_name.nb_match > 1) {
751 fprintf(stderr, "tethereal: WARNING: Protocol \"%s\" matched %u dissectors, first one will be used\n", dissector_str, user_protocol_name.nb_match);
755 /* OK, check whether the problem is that there isn't any such
756 protocol, or that there is but it's not specified as a protocol
757 that's valid for that dissector table.
758 Note, we don't exit here, but dissector_matching will remain NULL,
760 if (proto_get_id_by_filter_name(dissector_str) == -1) {
761 /* No such protocol */
762 fprintf(stderr, "tethereal: Unknown protocol -- \"%s\"\n", dissector_str);
764 fprintf(stderr, "tethereal: Protocol \"%s\" isn't valid for layer type \"%s\"\n",
765 dissector_str, table_name);
770 if (!dissector_matching) {
771 fprintf(stderr, "tethereal: Valid protocols for layer type \"%s\" are:\n", table_name);
772 fprint_all_protocols_for_layer_types(stderr, table_name);
773 g_free(decoded_param);
777 /* This is the end of the code that parses the command-line options.
778 All information is now stored in the variables:
782 The above variables that are strings are still pointing to areas within
783 decoded_parm. decoded_parm thus still needs to be kept allocated in
784 until we stop needing these variables
785 decoded_param will be deallocated at each exit point of this function */
788 /* We now have a pointer to the handle for the requested dissector
789 (requested protocol) inside the variable dissector_matching */
790 switch (dissector_table_selector_type) {
796 /* The selector for this table is an unsigned number. */
797 dissector_change(table_name, selector, dissector_matching);
802 /* The selector for this table is a string. */
803 dissector_change_string(table_name, selector_str, dissector_matching);
807 /* There are currently no dissector tables with any types other
808 than the ones listed above. */
809 g_assert_not_reached();
811 g_free(decoded_param); /* "Decode As" rule has been succesfully added */
816 main(int argc, char *argv[])
820 gboolean arg_error = FALSE;
826 char *gpf_path, *pf_path;
827 char *gdp_path, *dp_path;
828 int gpf_open_errno, gpf_read_errno;
829 int pf_open_errno, pf_read_errno;
830 int gdp_open_errno, gdp_read_errno;
831 int dp_open_errno, dp_read_errno;
834 gboolean capture_filter_specified = FALSE;
835 GList *if_list, *if_entry;
839 gchar err_str[PCAP_ERRBUF_SIZE];
840 gchar *cant_get_if_list_errstr;
842 gboolean capture_option_specified = FALSE;
844 int out_file_type = WTAP_FILE_PCAP;
845 gchar *cf_name = NULL, *rfilter = NULL;
848 GList *lt_list, *lt_entry;
849 data_link_info_t *data_link_info;
851 #ifdef HAVE_PCAP_OPEN_DEAD
852 struct bpf_program fcode;
854 dfilter_t *rfcode = NULL;
857 ethereal_tap_list *tli;
859 set_timestamp_setting(TS_RELATIVE);
861 /* Register all dissectors; we must do this before checking for the
862 "-G" flag, as the "-G" flag dumps information registered by the
863 dissectors, and we must do it before we read the preferences, in
864 case any dissectors register preferences. */
865 epan_init(PLUGIN_DIR,register_all_protocols,register_all_protocol_handoffs,
866 failure_message,open_failure_message,read_failure_message);
868 /* Register all tap listeners; we do this before we parse the arguments,
869 as the "-z" argument can specify a registered tap. */
870 register_all_tap_listeners();
872 /* Now register the preferences for any non-dissector modules.
873 We must do that before we read the preferences as well. */
874 prefs_register_modules();
876 /* If invoked with the "-G" flag, we dump out information based on
877 the argument to the "-G" flag; if no argument is specified,
878 for backwards compatibility we dump out a glossary of display
881 We do this here to mirror what happens in the GTK+ version, although
882 it's not necessary here. */
883 handle_dashG_option(argc, argv, "tethereal");
885 /* Set the C-language locale to the native environment. */
886 setlocale(LC_ALL, "");
888 prefs = read_prefs(&gpf_open_errno, &gpf_read_errno, &gpf_path,
889 &pf_open_errno, &pf_read_errno, &pf_path);
890 if (gpf_path != NULL) {
891 if (gpf_open_errno != 0) {
892 fprintf(stderr, "Can't open global preferences file \"%s\": %s.\n",
893 pf_path, strerror(gpf_open_errno));
895 if (gpf_read_errno != 0) {
896 fprintf(stderr, "I/O error reading global preferences file \"%s\": %s.\n",
897 pf_path, strerror(gpf_read_errno));
900 if (pf_path != NULL) {
901 if (pf_open_errno != 0) {
902 fprintf(stderr, "Can't open your preferences file \"%s\": %s.\n", pf_path,
903 strerror(pf_open_errno));
905 if (pf_read_errno != 0) {
906 fprintf(stderr, "I/O error reading your preferences file \"%s\": %s.\n",
907 pf_path, strerror(pf_read_errno));
913 /* Set the name resolution code's flags from the preferences. */
914 g_resolv_flags = prefs->name_resolve;
916 /* Read the disabled protocols file. */
917 read_disabled_protos_list(&gdp_path, &gdp_open_errno, &gdp_read_errno,
918 &dp_path, &dp_open_errno, &dp_read_errno);
919 if (gdp_path != NULL) {
920 if (gdp_open_errno != 0) {
922 "Could not open global disabled protocols file\n\"%s\": %s.\n",
923 gdp_path, strerror(gdp_open_errno));
925 if (gdp_read_errno != 0) {
927 "I/O error reading global disabled protocols file\n\"%s\": %s.\n",
928 gdp_path, strerror(gdp_read_errno));
932 if (dp_path != NULL) {
933 if (dp_open_errno != 0) {
935 "Could not open your disabled protocols file\n\"%s\": %s.\n", dp_path,
936 strerror(dp_open_errno));
938 if (dp_read_errno != 0) {
940 "I/O error reading your disabled protocols file\n\"%s\": %s.\n", dp_path,
941 strerror(dp_read_errno));
947 /* Load Wpcap, if possible */
951 init_cap_file(&cfile);
953 /* Assemble the compile-time version information string */
954 comp_info_str = g_string_new("Compiled ");
955 get_compiled_version_info(comp_info_str);
957 /* Assemble the run-time version information string */
958 runtime_info_str = g_string_new("Running ");
959 get_runtime_version_info(runtime_info_str);
961 /* Print format defaults to this. */
962 print_format = PR_FMT_TEXT;
964 /* Now get our args */
965 while ((opt = getopt(argc, argv, "a:b:c:d:Df:F:hi:lLnN:o:pqr:R:s:St:T:vw:Vxy:z:")) != -1) {
967 case 'a': /* autostop criteria */
969 if (set_autostop_criterion(optarg) == FALSE) {
970 fprintf(stderr, "tethereal: Invalid or unknown -a flag \"%s\"\n", optarg);
974 capture_option_specified = TRUE;
978 case 'b': /* Ringbuffer option */
980 capture_opts.ringbuffer_on = TRUE;
981 if (get_ring_arguments(optarg) == FALSE) {
982 fprintf(stderr, "tethereal: Invalid or unknown -b arg \"%s\"\n", optarg);
986 capture_option_specified = TRUE;
990 case 'c': /* Capture xxx packets */
992 capture_opts.autostop_count =
993 get_positive_int(optarg, "packet count");
995 capture_option_specified = TRUE;
999 case 'd': /* Decode as rule */
1000 if (!add_decode_as(optarg))
1003 case 'D': /* Print a list of capture devices */
1005 if_list = get_interface_list(&err, err_str);
1006 if (if_list == NULL) {
1009 case CANT_GET_INTERFACE_LIST:
1010 cant_get_if_list_errstr =
1011 cant_get_if_list_error_message(err_str);
1012 fprintf(stderr, "tethereal: %s\n", cant_get_if_list_errstr);
1013 g_free(cant_get_if_list_errstr);
1016 case NO_INTERFACES_FOUND:
1017 fprintf(stderr, "tethereal: There are no interfaces on which a capture can be done\n");
1022 i = 1; /* Interface id number */
1023 for (if_entry = g_list_first(if_list); if_entry != NULL;
1024 if_entry = g_list_next(if_entry)) {
1025 if_info = if_entry->data;
1026 printf("%d. %s", i++, if_info->name);
1027 if (if_info->description != NULL)
1028 printf(" (%s)", if_info->description);
1031 free_interface_list(if_list);
1034 capture_option_specified = TRUE;
1040 capture_filter_specified = TRUE;
1042 g_free(cfile.cfilter);
1043 cfile.cfilter = g_strdup(optarg);
1045 capture_option_specified = TRUE;
1050 out_file_type = wtap_short_string_to_file_type(optarg);
1051 if (out_file_type < 0) {
1052 fprintf(stderr, "tethereal: \"%s\" isn't a valid capture file type\n",
1057 case 'h': /* Print help and exit */
1061 case 'i': /* Use interface xxx */
1064 * If the argument is a number, treat it as an index into the list
1065 * of adapters, as printed by "tethereal -D".
1067 * This should be OK on UNIX systems, as interfaces shouldn't have
1068 * names that begin with digits. It can be useful on Windows, where
1069 * more than one interface can have the same name.
1071 adapter_index = strtol(optarg, &p, 10);
1072 if (p != NULL && *p == '\0') {
1073 if (adapter_index < 0) {
1075 "tethereal: The specified adapter index is a negative number\n");
1078 if (adapter_index > INT_MAX) {
1080 "tethereal: The specified adapter index is too large (greater than %d)\n",
1084 if (adapter_index == 0) {
1085 fprintf(stderr, "tethereal: there is no interface with that adapter index\n");
1088 if_list = get_interface_list(&err, err_str);
1089 if (if_list == NULL) {
1092 case CANT_GET_INTERFACE_LIST:
1093 cant_get_if_list_errstr =
1094 cant_get_if_list_error_message(err_str);
1095 fprintf(stderr, "tethereal: %s\n", cant_get_if_list_errstr);
1096 g_free(cant_get_if_list_errstr);
1099 case NO_INTERFACES_FOUND:
1100 fprintf(stderr, "tethereal: There are no interfaces on which a capture can be done\n");
1105 if_info = g_list_nth_data(if_list, adapter_index - 1);
1106 if (if_info == NULL) {
1107 fprintf(stderr, "tethereal: there is no interface with that adapter index\n");
1110 cfile.iface = g_strdup(if_info->name);
1111 free_interface_list(if_list);
1113 cfile.iface = g_strdup(optarg);
1115 capture_option_specified = TRUE;
1119 case 'l': /* "Line-buffer" standard output */
1120 /* This isn't line-buffering, strictly speaking, it's just
1121 flushing the standard output after the information for
1122 each packet is printed; however, that should be good
1123 enough for all the purposes to which "-l" is put (and
1124 is probably actually better for "-V", as it does fewer
1127 See the comment in "process_packet()" for an explanation of
1128 why we do that, and why we don't just use "setvbuf()" to
1129 make the standard output line-buffered (short version: in
1130 Windows, "line-buffered" is the same as "fully-buffered",
1131 and the output buffer is only flushed when it fills up). */
1132 line_buffered = TRUE;
1134 case 'L': /* Print list of link-layer types and exit */
1136 list_link_layer_types = TRUE;
1139 capture_option_specified = TRUE;
1143 case 'n': /* No name resolution */
1144 g_resolv_flags = RESOLV_NONE;
1146 case 'N': /* Select what types of addresses/port #s to resolve */
1147 if (g_resolv_flags == RESOLV_ALL)
1148 g_resolv_flags = RESOLV_NONE;
1149 badopt = string_to_name_resolve(optarg, &g_resolv_flags);
1150 if (badopt != '\0') {
1151 fprintf(stderr, "tethereal: -N specifies unknown resolving option '%c'; valid options are 'm', 'n', and 't'\n",
1156 case 'o': /* Override preference from command line */
1157 switch (prefs_set_pref(optarg)) {
1159 case PREFS_SET_SYNTAX_ERR:
1160 fprintf(stderr, "tethereal: Invalid -o flag \"%s\"\n", optarg);
1164 case PREFS_SET_NO_SUCH_PREF:
1165 case PREFS_SET_OBSOLETE:
1166 fprintf(stderr, "tethereal: -o flag \"%s\" specifies unknown preference\n",
1172 case 'p': /* Don't capture in promiscuous mode */
1174 capture_opts.promisc_mode = FALSE;
1176 capture_option_specified = TRUE;
1180 case 'q': /* Quiet */
1183 case 'r': /* Read capture file xxx */
1184 cf_name = g_strdup(optarg);
1186 case 'R': /* Read file filter */
1189 case 's': /* Set the snapshot (capture) length */
1191 capture_opts.snaplen = get_positive_int(optarg, "snapshot length");
1193 capture_option_specified = TRUE;
1197 case 'S': /* show packets in real time */
1198 print_packet_info = TRUE;
1200 case 't': /* Time stamp type */
1201 if (strcmp(optarg, "r") == 0)
1202 set_timestamp_setting(TS_RELATIVE);
1203 else if (strcmp(optarg, "a") == 0)
1204 set_timestamp_setting(TS_ABSOLUTE);
1205 else if (strcmp(optarg, "ad") == 0)
1206 set_timestamp_setting(TS_ABSOLUTE_WITH_DATE);
1207 else if (strcmp(optarg, "d") == 0)
1208 set_timestamp_setting(TS_DELTA);
1210 fprintf(stderr, "tethereal: Invalid time stamp type \"%s\"\n",
1212 fprintf(stderr, "It must be \"r\" for relative, \"a\" for absolute,\n");
1213 fprintf(stderr, "\"ad\" for absolute with date, or \"d\" for delta.\n");
1217 case 'T': /* printing Type */
1218 if (strcmp(optarg, "text") == 0) {
1219 output_action = WRITE_TEXT;
1220 print_format = PR_FMT_TEXT;
1221 } else if (strcmp(optarg, "ps") == 0) {
1222 output_action = WRITE_TEXT;
1223 print_format = PR_FMT_PS;
1224 } else if (strcmp(optarg, "pdml") == 0) {
1225 output_action = WRITE_XML;
1227 } else if (strcmp(optarg, "psml") == 0) {
1228 output_action = WRITE_XML;
1231 fprintf(stderr, "tethereal: Invalid -T parameter.\n");
1232 fprintf(stderr, "It must be \"ps\", \"text\", \"pdml\", or \"psml\".\n");
1236 case 'v': /* Show version and exit */
1237 printf("t" PACKAGE " " VERSION
1242 comp_info_str->str, runtime_info_str->str);
1245 case 'w': /* Write to capture file xxx */
1246 capture_opts.save_file = g_strdup(optarg);
1248 case 'V': /* Verbose */
1251 case 'x': /* Print packet data in hex (and ASCII) */
1254 case 'y': /* Set the pcap data link type */
1256 #ifdef HAVE_PCAP_DATALINK_NAME_TO_VAL
1257 capture_opts.linktype = pcap_datalink_name_to_val(optarg);
1258 if (capture_opts.linktype == -1) {
1259 fprintf(stderr, "tethereal: The specified data link type \"%s\" isn't valid\n",
1263 #else /* HAVE_PCAP_DATALINK_NAME_TO_VAL */
1264 /* XXX - just treat it as a number */
1265 capture_opts.linktype = get_natural_int(optarg, "data link type");
1266 #endif /* HAVE_PCAP_DATALINK_NAME_TO_VAL */
1268 capture_option_specified = TRUE;
1273 for(tli=tap_list;tli;tli=tli->next){
1274 if(!strncmp(tli->cmd,optarg,strlen(tli->cmd))){
1275 (*tli->func)(optarg);
1280 fprintf(stderr,"tethereal: invalid -z argument.\n");
1281 fprintf(stderr," -z argument must be one of :\n");
1282 for(tli=tap_list;tli;tli=tli->next){
1283 fprintf(stderr," %s\n",tli->cmd);
1289 case '?': /* Bad flag - print usage message */
1295 /* If no capture filter or read filter has been specified, and there are
1296 still command-line arguments, treat them as the tokens of a capture
1297 filter (if no "-r" flag was specified) or a read filter (if a "-r"
1298 flag was specified. */
1299 if (optind < argc) {
1300 if (cf_name != NULL) {
1301 if (rfilter != NULL) {
1303 "tethereal: Read filters were specified both with \"-R\" and with additional command-line arguments\n");
1306 rfilter = get_args_as_string(argc, argv, optind);
1309 if (capture_filter_specified) {
1311 "tethereal: Capture filters were specified both with \"-f\" and with additional command-line arguments\n");
1314 cfile.cfilter = get_args_as_string(argc, argv, optind);
1316 capture_option_specified = TRUE;
1321 /* See if we're writing a capture file and the file is a pipe */
1323 ld.output_to_pipe = FALSE;
1325 if (capture_opts.save_file != NULL) {
1326 /* We're writing to a capture file. */
1327 if (strcmp(capture_opts.save_file, "-") == 0) {
1328 /* Write to the standard output. */
1329 g_free(capture_opts.save_file);
1330 capture_opts.save_file = g_strdup("");
1332 /* XXX - should we check whether it's a pipe? It's arguably
1333 silly to do "-w - >output_file" rather than "-w output_file",
1334 but by not checking we might be violating the Principle Of
1335 Least Astonishment. */
1336 ld.output_to_pipe = TRUE;
1341 err = test_for_fifo(capture_opts.save_file);
1344 case ENOENT: /* it doesn't exist, so we'll be creating it,
1345 and it won't be a FIFO */
1346 case 0: /* found it, but it's not a FIFO */
1349 case ESPIPE: /* it is a FIFO */
1350 ld.output_to_pipe = TRUE;
1353 default: /* couldn't stat it */
1355 "tethereal: Error testing whether capture file is a pipe: %s\n",
1362 /* We're not writing to a file, so we should print packet information
1363 unless "-q" was specified. */
1365 print_packet_info = TRUE;
1368 #ifndef HAVE_LIBPCAP
1369 if (capture_option_specified)
1370 fprintf(stderr, "This version of Tethereal was not built with support for capturing packets.\n");
1377 /* We don't support capture filters when reading from a capture file
1378 (the BPF compiler doesn't support all link-layer types that we
1379 support in capture files we read). */
1381 if (cf_name != NULL) {
1382 if (capture_filter_specified) {
1384 "tethereal: Only read filters, not capture filters, can be specified when reading a capture file.\n");
1391 if (output_action != WRITE_TEXT) {
1392 fprintf(stderr, "tethereal: Raw packet hex data can only be printed as text or PostScript\n");
1398 if (list_link_layer_types) {
1399 /* We're supposed to list the link-layer types for an interface;
1400 did the user also specify a capture file to be read? */
1402 /* Yes - that's bogus. */
1403 fprintf(stderr, "tethereal: You can't specify -L and a capture file to be read.\n");
1406 /* No - did they specify a ring buffer option? */
1407 if (capture_opts.ringbuffer_on) {
1408 fprintf(stderr, "tethereal: Ring buffer requested, but a capture isn't being done.\n");
1412 /* If they didn't specify a "-w" flag, but specified a maximum capture
1413 file size, tell them that this doesn't work, and exit. */
1414 if (capture_opts.has_autostop_filesize && capture_opts.save_file == NULL) {
1415 fprintf(stderr, "tethereal: Maximum capture file size specified, but "
1416 "capture isn't being saved to a file.\n");
1420 if (capture_opts.ringbuffer_on) {
1421 /* Ring buffer works only under certain conditions:
1422 a) ring buffer does not work if you're not saving the capture to
1424 b) ring buffer only works if you're saving in libpcap format;
1425 c) it makes no sense to enable the ring buffer if the maximum
1426 file size is set to "infinite";
1427 d) file must not be a pipe. */
1428 if (capture_opts.save_file == NULL) {
1429 fprintf(stderr, "tethereal: Ring buffer requested, but "
1430 "capture isn't being saved to a file.\n");
1433 if (out_file_type != WTAP_FILE_PCAP) {
1434 fprintf(stderr, "tethereal: Ring buffer requested, but "
1435 "capture isn't being saved in libpcap format.\n");
1438 if (!capture_opts.has_autostop_filesize) {
1439 fprintf(stderr, "tethereal: Ring buffer requested, but "
1440 "no maximum capture file size was specified.\n");
1443 if (ld.output_to_pipe) {
1444 fprintf(stderr, "tethereal: Ring buffer requested, but "
1445 "capture file is a pipe.\n");
1453 /* Start windows sockets */
1454 WSAStartup( MAKEWORD( 1, 1 ), &wsaData );
1457 /* Notify all registered modules that have had any of their preferences
1458 changed either from one of the preferences file or from the command
1459 line that their preferences have changed. */
1462 /* disabled protocols as per configuration file */
1463 if (gdp_path == NULL && dp_path == NULL) {
1464 set_disabled_protos_list();
1467 /* Build the column format array */
1468 col_setup(&cfile.cinfo, prefs->num_cols);
1469 for (i = 0; i < cfile.cinfo.num_cols; i++) {
1470 cfile.cinfo.col_fmt[i] = get_column_format(i);
1471 cfile.cinfo.col_title[i] = g_strdup(get_column_title(i));
1472 cfile.cinfo.fmt_matx[i] = (gboolean *) g_malloc0(sizeof(gboolean) *
1474 get_column_format_matches(cfile.cinfo.fmt_matx[i], cfile.cinfo.col_fmt[i]);
1475 cfile.cinfo.col_data[i] = NULL;
1476 if (cfile.cinfo.col_fmt[i] == COL_INFO)
1477 cfile.cinfo.col_buf[i] = (gchar *) g_malloc(sizeof(gchar) * COL_MAX_INFO_LEN);
1479 cfile.cinfo.col_buf[i] = (gchar *) g_malloc(sizeof(gchar) * COL_MAX_LEN);
1480 cfile.cinfo.col_fence[i] = 0;
1481 cfile.cinfo.col_expr[i] = (gchar *) g_malloc(sizeof(gchar) * COL_MAX_LEN);
1482 cfile.cinfo.col_expr_val[i] = (gchar *) g_malloc(sizeof(gchar) * COL_MAX_LEN);
1485 for (i = 0; i < cfile.cinfo.num_cols; i++) {
1488 for (j = 0; j < NUM_COL_FMTS; j++) {
1489 if (!cfile.cinfo.fmt_matx[i][j])
1492 if (cfile.cinfo.col_first[j] == -1)
1493 cfile.cinfo.col_first[j] = i;
1494 cfile.cinfo.col_last[j] = i;
1499 if (capture_opts.snaplen < 1)
1500 capture_opts.snaplen = WTAP_MAX_PACKET_SIZE;
1501 else if (capture_opts.snaplen < MIN_PACKET_SIZE)
1502 capture_opts.snaplen = MIN_PACKET_SIZE;
1504 /* Check the value range of the ringbuffer_num_files parameter */
1505 if (capture_opts.ringbuffer_num_files > RINGBUFFER_MAX_NUM_FILES)
1506 capture_opts.ringbuffer_num_files = RINGBUFFER_MAX_NUM_FILES;
1507 #if RINGBUFFER_MIN_NUM_FILES > 0
1508 else if (capture_opts.ringbuffer_num_files < RINGBUFFER_MIN_NUM_FILES)
1509 capture_opts.ringbuffer_num_files = RINGBUFFER_MIN_NUM_FILES;
1513 if (rfilter != NULL) {
1514 if (!dfilter_compile(rfilter, &rfcode)) {
1515 fprintf(stderr, "tethereal: %s\n", dfilter_error_msg);
1517 #ifdef HAVE_PCAP_OPEN_DEAD
1521 pc = pcap_open_dead(DLT_EN10MB, MIN_PACKET_SIZE);
1523 if (pcap_compile(pc, &fcode, rfilter, 0, 0) != -1) {
1525 " Note: That display filter code looks like a valid capture filter;\n"
1526 " maybe you mixed them up?\n");
1535 cfile.rfcode = rfcode;
1537 if (print_packet_info) {
1538 /* If we're printing as text or PostScript, we have
1539 to create a print stream. */
1540 if (output_action == WRITE_TEXT) {
1541 switch (print_format) {
1544 print_stream = print_stream_text_stdio_new(stdout);
1548 print_stream = print_stream_ps_stdio_new(stdout);
1552 g_assert_not_reached();
1557 /* We have to dissect each packet if:
1559 we're printing information about each packet;
1561 we're using a read filter on the packets;
1563 we're using any taps. */
1564 do_dissection = print_packet_info || rfcode || have_tap_listeners();
1568 * We're reading a capture file.
1573 * Immediately relinquish any set-UID or set-GID privileges we have;
1574 * we must not be allowed to read any capture files the user running
1575 * Tethereal can't open.
1581 if (cf_open(&cfile, cf_name, FALSE, &err) != CF_OK) {
1585 err = load_cap_file(&cfile, &capture_opts, out_file_type);
1592 /* No capture file specified, so we're supposed to do a live capture
1593 (or get a list of link-layer types for a live capture device);
1594 do we have support for live captures? */
1599 fprintf(stderr, "tethereal: Could not load wpcap.dll.\n");
1604 /* Yes; did the user specify an interface to use? */
1605 if (cfile.iface == NULL) {
1606 /* No - is a default specified in the preferences file? */
1607 if (prefs->capture_device != NULL) {
1609 if_text = strrchr(prefs->capture_device, ' ');
1610 if (if_text == NULL) {
1611 cfile.iface = g_strdup(prefs->capture_device);
1613 cfile.iface = g_strdup(if_text + 1); /* Skip over space */
1616 /* No - pick the first one from the list of interfaces. */
1617 if_list = get_interface_list(&err, err_str);
1618 if (if_list == NULL) {
1621 case CANT_GET_INTERFACE_LIST:
1622 cant_get_if_list_errstr =
1623 cant_get_if_list_error_message(err_str);
1624 fprintf(stderr, "tethereal: %s\n", cant_get_if_list_errstr);
1625 g_free(cant_get_if_list_errstr);
1628 case NO_INTERFACES_FOUND:
1629 fprintf(stderr, "tethereal: There are no interfaces on which a capture can be done\n");
1634 if_info = if_list->data; /* first interface */
1635 cfile.iface = g_strdup(if_info->name);
1636 free_interface_list(if_list);
1640 if (list_link_layer_types) {
1641 /* We were asked to list the link-layer types for an interface.
1642 Get the list of link-layer types for the capture device. */
1643 lt_list = get_pcap_linktype_list(cfile.iface, err_str);
1644 if (lt_list == NULL) {
1645 if (err_str[0] != '\0') {
1646 fprintf(stderr, "tethereal: The list of data link types for the capture device could not be obtained (%s).\n"
1647 "Please check to make sure you have sufficient permissions, and that\n"
1648 "you have the proper interface or pipe specified.\n", err_str);
1650 fprintf(stderr, "tethereal: The capture device has no data link types.\n");
1653 fprintf(stderr, "Data link types (use option -y to set):\n");
1654 for (lt_entry = lt_list; lt_entry != NULL;
1655 lt_entry = g_list_next(lt_entry)) {
1656 data_link_info = lt_entry->data;
1657 fprintf(stderr, " %s", data_link_info->name);
1658 if (data_link_info->description != NULL)
1659 fprintf(stderr, " (%s)", data_link_info->description);
1661 fprintf(stderr, " (not supported)");
1664 free_pcap_linktype_list(lt_list);
1668 capture(out_file_type);
1670 if (capture_opts.ringbuffer_on) {
1674 /* No - complain. */
1675 fprintf(stderr, "This version of Tethereal was not built with support for capturing packets.\n");
1680 draw_tap_listeners(TRUE);
1687 /* Do the low-level work of a capture.
1688 Returns TRUE if it succeeds, FALSE otherwise. */
1690 static condition *volatile cnd_ring_timeout = NULL; /* this must be visible in process_packet */
1693 capture(int out_file_type)
1697 gchar open_err_str[PCAP_ERRBUF_SIZE];
1698 gchar lookup_net_err_str[PCAP_ERRBUF_SIZE];
1699 bpf_u_int32 netnum, netmask;
1700 struct bpf_program fcode;
1701 const char *set_linktype_err_str;
1703 int volatile volatile_err = 0;
1704 int volatile inpkts = 0;
1706 char errmsg[1024+1];
1707 condition *volatile cnd_stop_capturesize = NULL;
1708 condition *volatile cnd_stop_timeout = NULL;
1711 void (*oldhandler)(int);
1712 static const char ppamsg[] = "can't find PPA for ";
1714 volatile int pipe_fd = -1;
1715 struct pcap_hdr hdr;
1716 struct pcaprec_modified_hdr rechdr;
1717 guchar pcap_data[WTAP_MAX_PACKET_SIZE];
1719 struct pcap_stat stats;
1722 dfilter_t *rfcode = NULL;
1725 /* Initialize all data structures used for dissection. */
1728 ld.linktype = WTAP_ENCAP_UNKNOWN;
1731 /* Open the network interface to capture from it.
1732 Some versions of libpcap may put warnings into the error buffer
1733 if they succeed; to tell if that's happened, we have to clear
1734 the error buffer, and check if it's still a null string. */
1735 open_err_str[0] = '\0';
1736 ld.pch = pcap_open_live(cfile.iface, capture_opts.snaplen,
1737 capture_opts.promisc_mode, 1000, open_err_str);
1739 if (ld.pch != NULL) {
1740 /* setting the data link type only works on real interfaces */
1741 if (capture_opts.linktype != -1) {
1742 set_linktype_err_str = set_pcap_linktype(ld.pch, cfile.iface,
1743 capture_opts.linktype);
1744 if (set_linktype_err_str != NULL) {
1745 snprintf(errmsg, sizeof errmsg, "Unable to set data link type (%s).",
1746 set_linktype_err_str);
1751 /* We couldn't open "cfile.iface" as a network device. */
1753 /* On Windows, we don't support capturing on pipes, so we give up. */
1755 /* On Win32 OSes, the capture devices are probably available to all
1756 users; don't warn about permissions problems.
1758 Do, however, warn that WAN devices aren't supported. */
1759 snprintf(errmsg, sizeof errmsg,
1760 "The capture session could not be initiated (%s).\n"
1761 "Please check that you have the proper interface specified.\n"
1763 "Note that the WinPcap 2.x version of the driver Ethereal uses for packet\n"
1764 "capture on Windows doesn't support capturing on PPP/WAN interfaces in\n"
1765 "Windows NT/2000/XP/2003 Server, and that the WinPcap 3.0 and later versions\n"
1766 "don't support capturing on PPP/WAN interfaces at all.\n",
1770 /* try to open cfile.iface as a pipe */
1771 pipe_fd = pipe_open_live(cfile.iface, &hdr, &ld, errmsg, sizeof errmsg);
1773 if (pipe_fd == -1) {
1775 if (ld.pipe_err == PIPNEXIST) {
1776 /* Pipe doesn't exist, so output message for interface */
1778 /* If we got a "can't find PPA for XXX" message, warn the user (who
1779 is running Tethereal on HP-UX) that they don't have a version
1780 of libpcap that properly handles HP-UX (libpcap 0.6.x and later
1781 versions, which properly handle HP-UX, say "can't find /dev/dlpi
1782 PPA for XXX" rather than "can't find PPA for XXX"). */
1783 if (strncmp(open_err_str, ppamsg, sizeof ppamsg - 1) == 0)
1786 "You are running Tethereal with a version of the libpcap library\n"
1787 "that doesn't handle HP-UX network devices well; this means that\n"
1788 "Tethereal may not be able to capture packets.\n"
1790 "To fix this, you should install libpcap 0.6.2, or a later version\n"
1791 "of libpcap, rather than libpcap 0.4 or 0.5.x. It is available in\n"
1792 "packaged binary form from the Software Porting And Archive Centre\n"
1793 "for HP-UX; the Centre is at http://hpux.connect.org.uk/ - the page\n"
1794 "at the URL lists a number of mirror sites.";
1797 snprintf(errmsg, sizeof errmsg,
1798 "The capture session could not be initiated (%s).\n"
1799 "Please check to make sure you have sufficient permissions, and that\n"
1800 "you have the proper interface or pipe specified.%s", open_err_str,
1804 * Else pipe (or file) does exist and pipe_open_live() has
1809 /* pipe_open_live() succeeded; don't want
1810 error message from pcap_open_live() */
1811 open_err_str[0] = '\0';
1817 * We've opened the capture device, so, if we're set-UID or set-GID,
1818 * relinquish those privileges.
1820 * XXX - if we have saved set-user-ID support, we should give up those
1821 * privileges immediately, and then reclaim them long enough to get
1822 * a list of network interfaces and to open one, and then give them
1823 * up again, so that stuff we do while processing the argument list,
1824 * reading the user's preferences, etc. is done as the real user and
1825 * group, not the effective user and group.
1831 if (cfile.cfilter && !ld.from_pipe) {
1832 /* A capture filter was specified; set it up. */
1833 if (pcap_lookupnet(cfile.iface, &netnum, &netmask, lookup_net_err_str) < 0) {
1835 * Well, we can't get the netmask for this interface; it's used
1836 * only for filters that check for broadcast IP addresses, so
1837 * we just warn the user, and punt and use 0.
1840 "Warning: Couldn't obtain netmask info (%s).\n", lookup_net_err_str);
1843 if (pcap_compile(ld.pch, &fcode, cfile.cfilter, 1, netmask) < 0) {
1844 if (dfilter_compile(cfile.cfilter, &rfcode)) {
1845 snprintf(errmsg, sizeof errmsg,
1846 "Unable to parse capture filter string (%s).\n"
1847 " Interestingly enough, this looks like a valid display filter\n"
1848 " Are you sure you didn't mix them up?",
1849 pcap_geterr(ld.pch));
1851 snprintf(errmsg, sizeof errmsg,
1852 "Unable to parse capture filter string (%s).",
1853 pcap_geterr(ld.pch));
1857 if (pcap_setfilter(ld.pch, &fcode) < 0) {
1858 snprintf(errmsg, sizeof errmsg, "Can't install filter (%s).",
1859 pcap_geterr(ld.pch));
1864 /* Set up to write to the capture file. */
1867 pcap_encap = hdr.network;
1868 file_snaplen = hdr.snaplen;
1872 pcap_encap = get_pcap_linktype(ld.pch, cfile.iface);
1873 file_snaplen = pcap_snapshot(ld.pch);
1875 ld.linktype = wtap_pcap_encap_to_wtap_encap(pcap_encap);
1876 if (capture_opts.save_file != NULL) {
1877 /* Set up to write to the capture file. */
1878 if (ld.linktype == WTAP_ENCAP_UNKNOWN) {
1879 strcpy(errmsg, "The network you're capturing from is of a type"
1880 " that Tethereal doesn't support.");
1883 if (capture_opts.ringbuffer_on) {
1884 save_file_fd = ringbuf_init(capture_opts.save_file,
1885 capture_opts.ringbuffer_num_files);
1886 if (save_file_fd != -1) {
1887 ld.pdh = ringbuf_init_wtap_dump_fdopen(out_file_type, ld.linktype,
1888 file_snaplen, &err);
1890 err = errno; /* "ringbuf_init()" failed */
1894 ld.pdh = wtap_dump_open(capture_opts.save_file, out_file_type,
1895 ld.linktype, file_snaplen, &err);
1898 if (ld.pdh == NULL) {
1899 snprintf(errmsg, sizeof errmsg,
1900 cf_open_error_message(err, NULL, TRUE, out_file_type),
1901 *capture_opts.save_file == '\0' ? "stdout" : capture_opts.save_file);
1906 /* Does "open_err_str" contain a non-empty string? If so, "pcap_open_live()"
1907 returned a warning; print it, but keep capturing. */
1908 if (open_err_str[0] != '\0')
1909 fprintf(stderr, "tethereal: WARNING: %s.\n", open_err_str);
1912 /* Catch a CTRL+C event and, if we get it, clean up and exit. */
1913 SetConsoleCtrlHandler(capture_cleanup, TRUE);
1915 /* Catch SIGINT and SIGTERM and, if we get either of them, clean up
1917 XXX - deal with signal semantics on various UNIX platforms. Or just
1918 use "sigaction()" and be done with it? */
1919 signal(SIGTERM, capture_cleanup);
1920 signal(SIGINT, capture_cleanup);
1921 if ((oldhandler = signal(SIGHUP, capture_cleanup)) != SIG_DFL)
1922 signal(SIGHUP, oldhandler);
1925 /* Catch SIGINFO and, if we get it and we're capturing to a file in
1926 quiet mode, report the number of packets we've captured. */
1927 signal(SIGINFO, report_counts_siginfo);
1928 #endif /* SIGINFO */
1931 /* Let the user know what interface was chosen. */
1932 descr = get_interface_descriptive_name(cfile.iface);
1933 fprintf(stderr, "Capturing on %s\n", descr);
1936 /* initialize capture stop conditions */
1937 init_capture_stop_conditions();
1938 /* create stop conditions */
1939 if (capture_opts.has_autostop_filesize)
1940 cnd_stop_capturesize = cnd_new((const char*)CND_CLASS_CAPTURESIZE,
1941 (long)capture_opts.autostop_filesize * 1000);
1942 if (capture_opts.has_autostop_duration)
1943 cnd_stop_timeout = cnd_new((const char*)CND_CLASS_TIMEOUT,
1944 (gint32)capture_opts.autostop_duration);
1946 if (capture_opts.ringbuffer_on && capture_opts.has_ring_duration)
1947 cnd_ring_timeout = cnd_new(CND_CLASS_TIMEOUT,
1948 capture_opts.ringbuffer_duration);
1950 if (!setjmp(ld.stopenv)) {
1952 ld.packet_count = 0;
1956 /* We need to be careful with automatic variables defined in the
1957 outer scope which are changed inside the loop. Most compilers
1958 don't try to roll them back to their original values after the
1959 longjmp which causes the loop to finish, but all that the
1960 standards say is that their values are indeterminate. If we
1961 don't want them to be rolled back, we should define them with the
1962 volatile attribute (paraphrasing W. Richard Stevens, Advanced
1963 Programming in the UNIX Environment, p. 178).
1965 The "err" variable causes a particular problem. If we give it
1966 the volatile attribute, then when we pass a reference to it (as
1967 in "&err") to a function, GCC warns: "passing arg <n> of
1968 <function> discards qualifiers from pointer target type".
1969 Therefore within the loop and just beyond we don't use "err".
1970 Within the loop we define "loop_err", and assign its value to
1971 "volatile_err", which is in the outer scope and is checked when
1974 We also define "packet_count_prev" here to keep things tidy,
1975 since it's used only inside the loop. If it were defined in the
1976 outer scope, GCC would give a warning (unnecessary in this case)
1977 that it might be clobbered, and we'd need to give it the volatile
1978 attribute to suppress the warning. */
1981 int packet_count_prev = 0;
1983 if (cnd_stop_capturesize == NULL && cnd_stop_timeout == NULL) {
1984 /* We're not stopping at a particular capture file size, and we're
1985 not stopping after some particular amount of time has expired,
1986 so either we have no stop condition or the only stop condition
1987 is a maximum packet count.
1989 If there's no maximum packet count, pass it -1, meaning "until
1990 you run out of packets in the bufferful you read". Otherwise,
1991 pass it the number of packets we have left to capture.
1993 We don't call "pcap_loop()" as, if we're saving to a file that's
1994 a FIFO, we want to flush the FIFO after we're done processing
1995 this libpcap bufferful of packets, so that the program
1996 reading the FIFO sees the packets immediately and doesn't get
1997 any partial packet, forcing it to block in the middle of reading
1999 if (capture_opts.autostop_count == 0)
2002 if (ld.packet_count >= capture_opts.autostop_count) {
2003 /* XXX do we need this test here? */
2004 /* It appears there's nothing more to capture. */
2007 pcap_cnt = capture_opts.autostop_count - ld.packet_count;
2010 /* We need to check the capture file size or the timeout after
2016 inpkts = pipe_dispatch(pipe_fd, &ld, &hdr, &rechdr, pcap_data,
2017 errmsg, sizeof errmsg);
2020 inpkts = pcap_dispatch(ld.pch, pcap_cnt, capture_pcap_cb, (guchar *) &ld);
2022 /* Error from "pcap_dispatch()", or error or "no more packets" from
2023 "pipe_dispatch(). */
2025 } else if (cnd_stop_timeout != NULL && cnd_eval(cnd_stop_timeout)) {
2026 /* The specified capture time has elapsed; stop the capture. */
2028 } else if (inpkts > 0) {
2029 if (capture_opts.autostop_count != 0 &&
2030 ld.packet_count >= capture_opts.autostop_count) {
2031 /* The specified number of packets have been captured and have
2032 passed both any capture filter in effect and any read filter
2035 } else if (cnd_stop_capturesize != NULL &&
2036 cnd_eval(cnd_stop_capturesize,
2037 (guint32)wtap_get_bytes_dumped(ld.pdh))) {
2038 /* We're saving the capture to a file, and the capture file reached
2039 its maximum size. */
2040 if (capture_opts.ringbuffer_on) {
2041 /* Switch to the next ringbuffer file */
2042 if (ringbuf_switch_file(&ld.pdh, &capture_opts.save_file, &save_file_fd, &loop_err)) {
2043 /* File switch succeeded: reset the condition */
2044 cnd_reset(cnd_stop_capturesize);
2045 if (cnd_ring_timeout) {
2046 cnd_reset(cnd_ring_timeout);
2049 /* File switch failed: stop here */
2050 volatile_err = loop_err;
2054 /* No ringbuffer - just stop. */
2058 if (ld.output_to_pipe) {
2059 if (ld.packet_count > packet_count_prev) {
2060 if (fflush(wtap_dump_file(ld.pdh))) {
2061 volatile_err = errno;
2064 packet_count_prev = ld.packet_count;
2068 } /* while (ld.go) */
2070 /* delete stop conditions */
2071 if (cnd_stop_capturesize != NULL)
2072 cnd_delete(cnd_stop_capturesize);
2073 if (cnd_stop_timeout != NULL)
2074 cnd_delete(cnd_stop_timeout);
2075 if (cnd_ring_timeout != NULL)
2076 cnd_delete(cnd_ring_timeout);
2078 if ((capture_opts.save_file != NULL) && !quiet) {
2079 /* We're saving to a file, which means we're printing packet counts
2080 to stderr if we are not running silent and deep.
2081 Send a newline so that we move to the line after the packet count. */
2082 fprintf(stderr, "\n");
2085 /* If we got an error while capturing, report it. */
2089 if (ld.pipe_err == PIPERR) {
2090 fprintf(stderr, "tethereal: Error while capturing packets: %s\n",
2096 fprintf(stderr, "tethereal: Error while capturing packets: %s\n",
2097 pcap_geterr(ld.pch));
2101 if (volatile_err == 0)
2104 show_capture_file_io_error(capture_opts.save_file, volatile_err, FALSE);
2108 if (capture_opts.save_file != NULL) {
2109 /* We're saving to a file or files; close all files. */
2110 if (capture_opts.ringbuffer_on) {
2111 dump_ok = ringbuf_wtap_dump_close(&capture_opts.save_file, &err);
2113 dump_ok = wtap_dump_close(ld.pdh, &err);
2115 /* If we've displayed a message about a write error, there's no point
2116 in displaying another message about an error on close. */
2117 if (!dump_ok && !write_err)
2118 show_capture_file_io_error(capture_opts.save_file, err, TRUE);
2122 if (ld.from_pipe && pipe_fd >= 0)
2127 /* Get the capture statistics, and, if any packets were dropped, report
2129 if (pcap_stats(ld.pch, &stats) >= 0) {
2130 if (stats.ps_drop != 0) {
2131 fprintf(stderr, "%u packets dropped\n", stats.ps_drop);
2134 fprintf(stderr, "tethereal: Can't get packet-drop statistics: %s\n",
2135 pcap_geterr(ld.pch));
2140 /* Report the number of captured packets if not reported during capture
2141 and we are saving to a file. */
2147 if (capture_opts.ringbuffer_on) {
2148 ringbuf_error_cleanup();
2150 g_free(capture_opts.save_file);
2151 capture_opts.save_file = NULL;
2152 fprintf(stderr, "tethereal: %s\n", errmsg);
2168 capture_pcap_cb(guchar *user, const struct pcap_pkthdr *phdr,
2171 struct wtap_pkthdr whdr;
2172 union wtap_pseudo_header pseudo_header;
2173 loop_data *ldat = (loop_data *) user;
2178 /* Convert from libpcap to Wiretap format.
2179 If that fails, ignore the packet (wtap_process_pcap_packet has
2180 written an error message). */
2181 pd = wtap_process_pcap_packet(ldat->linktype, phdr, pd, &pseudo_header,
2188 * Prevent a SIGINFO handler from writing to stdout while we're
2189 * doing so; instead, have it just set a flag telling us to print
2190 * that information when we're done.
2193 #endif /* SIGINFO */
2195 /* The current packet may have arrived after a very long silence,
2196 * way past the time to switch files. In order not to have
2197 * the first packet of a new series of events as the last
2198 * [or only] packet in the file, switch before writing!
2200 if (cnd_ring_timeout != NULL && cnd_eval(cnd_ring_timeout)) {
2201 /* time elapsed for this ring file, switch to the next */
2202 if (ringbuf_switch_file(&ldat->pdh, &capture_opts.save_file, &save_file_fd, &loop_err)) {
2203 /* File switch succeeded: reset the condition */
2204 cnd_reset(cnd_ring_timeout);
2206 /* File switch failed: stop here */
2207 /* XXX - we should do something with "loop_err" */
2212 if (!process_packet(&cfile, ldat->pdh, 0, &whdr, &pseudo_header, pd, &err)) {
2213 /* Error writing to a capture file */
2215 /* We're capturing packets, so (if -q not specified) we're printing
2216 a count of packets captured; move to the line after the count. */
2217 fprintf(stderr, "\n");
2219 show_capture_file_io_error(capture_opts.save_file, err, FALSE);
2220 pcap_close(ldat->pch);
2221 wtap_dump_close(ldat->pdh, &err);
2227 * Allow SIGINFO handlers to write.
2232 * If a SIGINFO handler asked us to write out capture counts, do so.
2236 #endif /* SIGINFO */
2241 capture_cleanup(DWORD ctrltype _U_)
2243 /* CTRL_C_EVENT is sort of like SIGINT, CTRL_BREAK_EVENT is unique to
2244 Windows, CTRL_CLOSE_EVENT is sort of like SIGHUP, CTRL_LOGOFF_EVENT
2245 is also sort of like SIGHUP, and CTRL_SHUTDOWN_EVENT is sort of
2246 like SIGTERM at least when the machine's shutting down.
2248 For now, we handle them all as indications that we should clean up
2249 and quit, just as we handle SIGINT, SIGHUP, and SIGTERM in that
2252 However, as handlers run in a new thread, we can't just longjmp
2253 out; we have to set "ld.go" to FALSE, and must return TRUE so that
2254 no other handler - such as one that would terminate the process -
2257 XXX - for some reason, typing ^C to Tethereal, if you run this in
2258 a Cygwin console window in at least some versions of Cygwin,
2259 causes Tethereal to terminate immediately; this routine gets
2260 called, but the main loop doesn't get a chance to run and
2261 exit cleanly, at least if this is compiled with Microsoft Visual
2262 C++ (i.e., it's a property of the Cygwin console window or Bash;
2263 it happens if Tethereal is not built with Cygwin - for all I know,
2264 building it with Cygwin may make the problem go away). */
2270 capture_cleanup(int signum _U_)
2272 /* Longjmp back to the starting point; "pcap_dispatch()", on many
2273 UNIX platforms, just keeps looping if it gets EINTR, so if we set
2274 "ld.go" to FALSE and return, we won't break out of it and quit
2276 longjmp(ld.stopenv, 1);
2284 /* XXX - if we use sigaction, this doesn't have to be done.
2285 (Yes, this isn't necessary on BSD, but just in case a system
2286 where "signal()" has AT&T semantics adopts SIGINFO....) */
2287 signal(SIGINFO, report_counts_siginfo);
2288 #endif /* SIGINFO */
2290 if (quiet || print_packet_info) {
2291 /* Report the count only if we aren't printing a packet count
2292 as packets arrive. */
2293 fprintf(stderr, "%u packets captured\n", ld.packet_count);
2296 infoprint = FALSE; /* we just reported it */
2297 #endif /* SIGINFO */
2302 report_counts_siginfo(int signum _U_)
2304 int sav_errno = errno;
2305 /* If we've been told to delay printing, just set a flag asking
2306 that we print counts (if we're supposed to), otherwise print
2307 the count of packets captured (if we're supposed to). */
2314 #endif /* SIGINFO */
2315 #endif /* HAVE_LIBPCAP */
2318 load_cap_file(capture_file *cf, capture_options *capture_opts, int out_file_type)
2321 int snapshot_length;
2327 linktype = wtap_file_encap(cf->wth);
2328 if (capture_opts->save_file != NULL) {
2329 /* Set up to write to the capture file. */
2330 snapshot_length = wtap_snapshot_length(cf->wth);
2331 if (snapshot_length == 0) {
2332 /* Snapshot length of input file not known. */
2333 snapshot_length = WTAP_MAX_PACKET_SIZE;
2335 pdh = wtap_dump_open(capture_opts->save_file, out_file_type,
2336 linktype, snapshot_length, &err);
2339 /* We couldn't set up to write to the capture file. */
2342 case WTAP_ERR_UNSUPPORTED_FILE_TYPE:
2344 "tethereal: Capture files can't be written in that format.\n");
2347 case WTAP_ERR_UNSUPPORTED_ENCAP:
2348 case WTAP_ERR_ENCAP_PER_PACKET_UNSUPPORTED:
2350 "tethereal: The capture file being read can't be written in "
2354 case WTAP_ERR_CANT_OPEN:
2356 "tethereal: The file \"%s\" couldn't be created for some "
2357 "unknown reason.\n",
2358 *capture_opts->save_file == '\0' ? "stdout" : capture_opts->save_file);
2361 case WTAP_ERR_SHORT_WRITE:
2363 "tethereal: A full header couldn't be written to the file \"%s\".\n",
2364 *capture_opts->save_file == '\0' ? "stdout" : capture_opts->save_file);
2369 "tethereal: The file \"%s\" could not be created: %s\n.",
2370 *capture_opts->save_file == '\0' ? "stdout" : capture_opts->save_file,
2371 wtap_strerror(err));
2377 if (print_packet_info) {
2378 if (!write_preamble(cf)) {
2380 show_print_file_io_error(err);
2386 while (wtap_read(cf->wth, &err, &err_info, &data_offset)) {
2387 if (!process_packet(cf, pdh, data_offset, wtap_phdr(cf->wth),
2388 wtap_pseudoheader(cf->wth), wtap_buf_ptr(cf->wth),
2390 /* Error writing to a capture file */
2391 show_capture_file_io_error(capture_opts->save_file, err, FALSE);
2392 wtap_dump_close(pdh, &err);
2397 /* Print a message noting that the read failed somewhere along the line. */
2400 case WTAP_ERR_UNSUPPORTED_ENCAP:
2402 "tethereal: \"%s\" has a packet with a network type that Tethereal doesn't support.\n(%s)\n",
2403 cf->filename, err_info);
2406 case WTAP_ERR_CANT_READ:
2408 "tethereal: An attempt to read from \"%s\" failed for some unknown reason.\n",
2412 case WTAP_ERR_SHORT_READ:
2414 "tethereal: \"%s\" appears to have been cut short in the middle of a packet.\n",
2418 case WTAP_ERR_BAD_RECORD:
2420 "tethereal: \"%s\" appears to be damaged or corrupt.\n(%s)\n",
2421 cf->filename, err_info);
2426 "tethereal: An error occurred while reading \"%s\": %s.\n",
2427 cf->filename, wtap_strerror(err));
2430 if (capture_opts->save_file != NULL) {
2431 /* Now close the capture file. */
2432 if (!wtap_dump_close(pdh, &err))
2433 show_capture_file_io_error(capture_opts->save_file, err, TRUE);
2436 if (capture_opts->save_file != NULL) {
2437 /* Now close the capture file. */
2438 if (!wtap_dump_close(pdh, &err))
2439 show_capture_file_io_error(capture_opts->save_file, err, TRUE);
2441 if (print_packet_info) {
2442 if (!write_finale()) {
2444 show_print_file_io_error(err);
2451 wtap_close(cf->wth);
2458 fill_in_fdata(frame_data *fdata, capture_file *cf,
2459 const struct wtap_pkthdr *phdr, long offset)
2464 fdata->num = cf->count;
2465 fdata->pkt_len = phdr->len;
2466 cum_bytes += phdr->len;
2467 fdata->cum_bytes = cum_bytes;
2468 fdata->cap_len = phdr->caplen;
2469 fdata->file_off = offset;
2470 fdata->lnk_t = phdr->pkt_encap;
2471 fdata->abs_secs = phdr->ts.tv_sec;
2472 fdata->abs_usecs = phdr->ts.tv_usec;
2473 fdata->flags.passed_dfilter = 0;
2474 fdata->flags.encoding = CHAR_ASCII;
2475 fdata->flags.visited = 0;
2476 fdata->flags.marked = 0;
2477 fdata->flags.ref_time = 0;
2479 /* If we don't have the time stamp of the first packet in the
2480 capture, it's because this is the first packet. Save the time
2481 stamp of this packet as the time stamp of the first packet. */
2482 if (!firstsec && !firstusec) {
2483 firstsec = fdata->abs_secs;
2484 firstusec = fdata->abs_usecs;
2487 /* If we don't have the time stamp of the previous displayed packet,
2488 it's because this is the first displayed packet. Save the time
2489 stamp of this packet as the time stamp of the previous displayed
2491 if (!prevsec && !prevusec) {
2492 prevsec = fdata->abs_secs;
2493 prevusec = fdata->abs_usecs;
2496 /* Get the time elapsed between the first packet and this packet. */
2497 compute_timestamp_diff(&fdata->rel_secs, &fdata->rel_usecs,
2498 fdata->abs_secs, fdata->abs_usecs, firstsec, firstusec);
2500 /* If it's greater than the current elapsed time, set the elapsed time
2501 to it (we check for "greater than" so as not to be confused by
2502 time moving backwards). */
2503 if ((gint32)cf->esec < fdata->rel_secs
2504 || ((gint32)cf->esec == fdata->rel_secs && (gint32)cf->eusec < fdata->rel_usecs)) {
2505 cf->esec = fdata->rel_secs;
2506 cf->eusec = fdata->rel_usecs;
2509 /* Get the time elapsed between the previous displayed packet and
2511 compute_timestamp_diff(&fdata->del_secs, &fdata->del_usecs,
2512 fdata->abs_secs, fdata->abs_usecs, prevsec, prevusec);
2513 prevsec = fdata->abs_secs;
2514 prevusec = fdata->abs_usecs;
2517 /* Free up all data attached to a "frame_data" structure. */
2519 clear_fdata(frame_data *fdata)
2522 g_slist_free(fdata->pfd);
2526 process_packet(capture_file *cf, wtap_dumper *pdh, long offset,
2527 const struct wtap_pkthdr *whdr,
2528 union wtap_pseudo_header *pseudo_header, const guchar *pd,
2532 gboolean create_proto_tree;
2533 epan_dissect_t *edt;
2536 /* Count this packet. */
2539 /* If we're going to print packet information, or we're going to
2540 run a read filter, or we're going to process taps, set up to
2541 do a dissection and do so. */
2542 if (do_dissection) {
2543 fill_in_fdata(&fdata, cf, whdr, offset);
2545 if (print_packet_info) {
2546 /* Grab any resolved addresses */
2548 if (g_resolv_flags) {
2549 host_name_lookup_process(NULL);
2554 if (cf->rfcode || verbose || num_tap_filters!=0)
2555 create_proto_tree = TRUE;
2557 create_proto_tree = FALSE;
2558 /* The protocol tree will be "visible", i.e., printed, only if we're
2559 printing packet details, which is true if we're printing stuff
2560 ("print_packet_info" is true) and we're in verbose mode ("verbose"
2562 edt = epan_dissect_new(create_proto_tree, print_packet_info && verbose);
2564 /* If we're running a read filter, prime the epan_dissect_t with that
2567 epan_dissect_prime_dfilter(edt, cf->rfcode);
2569 tap_queue_init(edt);
2571 /* We only need the columns if we're printing packet info but we're
2572 *not* verbose; in verbose mode, we print the protocol tree, not
2573 the protocol summary. */
2574 epan_dissect_run(edt, pseudo_header, pd, &fdata,
2575 (print_packet_info && !verbose) ? &cf->cinfo : NULL);
2577 tap_push_tapped_queue(edt);
2579 /* Run the read filter if we have one. */
2581 passed = dfilter_apply_edt(cf->rfcode, edt);
2585 /* We're not running a display filter and we're not printing any
2586 packet information, so we don't need to do a dissection, and all
2587 packets are processed. */
2593 /* Count this packet. */
2598 /* Process this packet. */
2600 /* We're writing to a capture file; write this packet. */
2601 if (!wtap_dump(pdh, whdr, pseudo_header, pd, err))
2604 /* Report packet capture count if not quiet */
2605 if (!quiet && !print_packet_info) {
2606 /* Don't print a packet count if we were asked not to with "-q"
2607 or if we're also printing packet info. */
2608 if (ld.packet_count != 0) {
2609 fprintf(stderr, "\r%u ", ld.packet_count);
2610 /* stderr could be line buffered */
2616 if (print_packet_info) {
2617 /* We're printing packet information; print the information for
2619 print_packet(cf, edt);
2621 /* The ANSI C standard does not appear to *require* that a line-buffered
2622 stream be flushed to the host environment whenever a newline is
2623 written, it just says that, on such a stream, characters "are
2624 intended to be transmitted to or from the host environment as a
2625 block when a new-line character is encountered".
2627 The Visual C++ 6.0 C implementation doesn't do what is intended;
2628 even if you set a stream to be line-buffered, it still doesn't
2629 flush the buffer at the end of every line.
2631 So, if the "-l" flag was specified, we flush the standard output
2632 at the end of a packet. This will do the right thing if we're
2633 printing packet summary lines, and, as we print the entire protocol
2634 tree for a single packet without waiting for anything to happen,
2635 it should be as good as line-buffered mode if we're printing
2636 protocol trees. (The whole reason for the "-l" flag in either
2637 tcpdump or Tethereal is to allow the output of a live capture to
2638 be piped to a program or script and to have that script see the
2639 information for the packet as soon as it's printed, rather than
2640 having to wait until a standard I/O buffer fills up. */
2644 if (ferror(stdout)) {
2645 show_print_file_io_error(errno);
2651 if (do_dissection) {
2652 epan_dissect_free(edt);
2653 clear_fdata(&fdata);
2659 show_capture_file_io_error(const char *fname, int err, gboolean is_close)
2668 "tethereal: Not all the packets could be written to \"%s\" because there is "
2669 "no space left on the file system.\n",
2676 "tethereal: Not all the packets could be written to \"%s\" because you are "
2677 "too close to, or over your disk quota.\n",
2682 case WTAP_ERR_CANT_CLOSE:
2684 "tethereal: \"%s\" couldn't be closed for some unknown reason.\n",
2688 case WTAP_ERR_SHORT_WRITE:
2690 "tethereal: Not all the packets could be written to \"%s\".\n",
2697 "tethereal: \"%s\" could not be closed: %s.\n",
2698 fname, wtap_strerror(err));
2701 "tethereal: An error occurred while writing to \"%s\": %s.\n",
2702 fname, wtap_strerror(err));
2709 write_preamble(capture_file *cf)
2711 switch (output_action) {
2714 return print_preamble(print_stream, cf->filename);
2719 write_pdml_preamble(stdout);
2721 write_psml_preamble(stdout);
2722 return !ferror(stdout);
2725 g_assert_not_reached();
2731 get_line_buf(size_t len)
2733 static char *line_bufp = NULL;
2734 static size_t line_buf_len = 256;
2735 size_t new_line_buf_len;
2737 for (new_line_buf_len = line_buf_len; len > new_line_buf_len;
2738 new_line_buf_len *= 2)
2740 if (line_bufp == NULL) {
2741 line_buf_len = new_line_buf_len;
2742 line_bufp = g_malloc(line_buf_len + 1);
2744 if (new_line_buf_len > line_buf_len) {
2745 line_buf_len = new_line_buf_len;
2746 line_bufp = g_realloc(line_bufp, line_buf_len + 1);
2753 print_columns(capture_file *cf)
2760 line_bufp = get_line_buf(256);
2763 for (i = 0; i < cf->cinfo.num_cols; i++) {
2764 switch (cf->cinfo.col_fmt[i]) {
2767 * Don't print this if we're doing a live capture from a network
2768 * interface - if we're doing a live capture, you won't be
2769 * able to look at the capture in the future (it's not being
2770 * saved anywhere), so the frame numbers are unlikely to be
2773 * (XXX - it might be nice to be able to save and print at
2774 * the same time, sort of like an "Update list of packets
2775 * in real time" capture in Ethereal.)
2777 if (cf->iface != NULL)
2779 column_len = strlen(cf->cinfo.col_data[i]);
2782 line_bufp = get_line_buf(buf_offset + column_len);
2783 sprintf(line_bufp + buf_offset, "%3s", cf->cinfo.col_data[i]);
2789 case COL_ABS_DATE_TIME: /* XXX - wider */
2790 column_len = strlen(cf->cinfo.col_data[i]);
2791 if (column_len < 10)
2793 line_bufp = get_line_buf(buf_offset + column_len);
2794 sprintf(line_bufp + buf_offset, "%10s", cf->cinfo.col_data[i]);
2800 case COL_DEF_DL_SRC:
2801 case COL_RES_DL_SRC:
2802 case COL_UNRES_DL_SRC:
2803 case COL_DEF_NET_SRC:
2804 case COL_RES_NET_SRC:
2805 case COL_UNRES_NET_SRC:
2806 column_len = strlen(cf->cinfo.col_data[i]);
2807 if (column_len < 12)
2809 line_bufp = get_line_buf(buf_offset + column_len);
2810 sprintf(line_bufp + buf_offset, "%12s", cf->cinfo.col_data[i]);
2816 case COL_DEF_DL_DST:
2817 case COL_RES_DL_DST:
2818 case COL_UNRES_DL_DST:
2819 case COL_DEF_NET_DST:
2820 case COL_RES_NET_DST:
2821 case COL_UNRES_NET_DST:
2822 column_len = strlen(cf->cinfo.col_data[i]);
2823 if (column_len < 12)
2825 line_bufp = get_line_buf(buf_offset + column_len);
2826 sprintf(line_bufp + buf_offset, "%-12s", cf->cinfo.col_data[i]);
2830 column_len = strlen(cf->cinfo.col_data[i]);
2831 line_bufp = get_line_buf(buf_offset + column_len);
2832 strcat(line_bufp + buf_offset, cf->cinfo.col_data[i]);
2835 buf_offset += column_len;
2836 if (i != cf->cinfo.num_cols - 1) {
2838 * This isn't the last column, so we need to print a
2839 * separator between this column and the next.
2841 * If we printed a network source and are printing a
2842 * network destination of the same type next, separate
2843 * them with "->"; if we printed a network destination
2844 * and are printing a network source of the same type
2845 * next, separate them with "<-"; otherwise separate them
2848 * We add enough space to the buffer for " <- " or " -> ",
2849 * even if we're only adding " ".
2851 line_bufp = get_line_buf(buf_offset + 4);
2852 switch (cf->cinfo.col_fmt[i]) {
2857 switch (cf->cinfo.col_fmt[i + 1]) {
2862 strcat(line_bufp + buf_offset, " -> ");
2867 strcat(line_bufp + buf_offset, " ");
2873 case COL_DEF_DL_SRC:
2874 case COL_RES_DL_SRC:
2875 case COL_UNRES_DL_SRC:
2876 switch (cf->cinfo.col_fmt[i + 1]) {
2878 case COL_DEF_DL_DST:
2879 case COL_RES_DL_DST:
2880 case COL_UNRES_DL_DST:
2881 strcat(line_bufp + buf_offset, " -> ");
2886 strcat(line_bufp + buf_offset, " ");
2892 case COL_DEF_NET_SRC:
2893 case COL_RES_NET_SRC:
2894 case COL_UNRES_NET_SRC:
2895 switch (cf->cinfo.col_fmt[i + 1]) {
2897 case COL_DEF_NET_DST:
2898 case COL_RES_NET_DST:
2899 case COL_UNRES_NET_DST:
2900 strcat(line_bufp + buf_offset, " -> ");
2905 strcat(line_bufp + buf_offset, " ");
2914 switch (cf->cinfo.col_fmt[i + 1]) {
2919 strcat(line_bufp + buf_offset, " <- ");
2924 strcat(line_bufp + buf_offset, " ");
2930 case COL_DEF_DL_DST:
2931 case COL_RES_DL_DST:
2932 case COL_UNRES_DL_DST:
2933 switch (cf->cinfo.col_fmt[i + 1]) {
2935 case COL_DEF_DL_SRC:
2936 case COL_RES_DL_SRC:
2937 case COL_UNRES_DL_SRC:
2938 strcat(line_bufp + buf_offset, " <- ");
2943 strcat(line_bufp + buf_offset, " ");
2949 case COL_DEF_NET_DST:
2950 case COL_RES_NET_DST:
2951 case COL_UNRES_NET_DST:
2952 switch (cf->cinfo.col_fmt[i + 1]) {
2954 case COL_DEF_NET_SRC:
2955 case COL_RES_NET_SRC:
2956 case COL_UNRES_NET_SRC:
2957 strcat(line_bufp + buf_offset, " <- ");
2962 strcat(line_bufp + buf_offset, " ");
2969 strcat(line_bufp + buf_offset, " ");
2975 return print_line(print_stream, 0, line_bufp);
2979 print_packet(capture_file *cf, epan_dissect_t *edt)
2981 print_args_t print_args;
2984 /* Print the information in the protocol tree. */
2985 switch (output_action) {
2988 print_args.to_file = TRUE;
2989 print_args.format = print_format;
2990 print_args.print_summary = !verbose;
2991 print_args.print_hex = verbose && print_hex;
2992 print_args.print_formfeed = FALSE;
2993 print_args.print_dissections = verbose ? print_dissections_expanded : print_dissections_none;
2995 /* init the packet range */
2996 packet_range_init(&print_args.range);
2998 if (!proto_tree_print(&print_args, edt, print_stream))
3001 /* "print_hex_data()" will put out a leading blank line, as well
3002 as a trailing one; print one here, to separate the packets,
3003 only if "print_hex_data()" won't be called. */
3004 if (!print_line(print_stream, 0, ""))
3010 proto_tree_write_pdml(edt, stdout);
3012 return !ferror(stdout);
3015 /* Just fill in the columns. */
3016 epan_dissect_fill_in_columns(edt);
3018 /* Now print them. */
3019 switch (output_action) {
3022 if (!print_columns(cf))
3027 proto_tree_write_psml(edt, stdout);
3028 return !ferror(stdout);
3032 if (!print_hex_data(print_stream, edt))
3034 if (!print_line(print_stream, 0, ""))
3043 switch (output_action) {
3046 return print_finale(print_stream);
3051 write_pdml_finale(stdout);
3053 write_psml_finale(stdout);
3054 return !ferror(stdout);
3057 g_assert_not_reached();
3063 show_print_file_io_error(int err)
3069 "tethereal: Not all the packets could be printed because there is "
3070 "no space left on the file system.\n");
3076 "tethereal: Not all the packets could be printed because you are "
3077 "too close to, or over your disk quota.\n");
3083 "tethereal: An error occurred while printing packets: %s.\n",
3090 cf_open_error_message(int err, gchar *err_info, gboolean for_writing,
3094 static char errmsg_errno[1024+1];
3097 /* Wiretap error. */
3100 case WTAP_ERR_NOT_REGULAR_FILE:
3101 errmsg = "The file \"%s\" is a \"special file\" or socket or other non-regular file.";
3104 case WTAP_ERR_FILE_UNKNOWN_FORMAT:
3105 /* Seen only when opening a capture file for reading. */
3106 errmsg = "The file \"%s\" isn't a capture file in a format Tethereal understands.";
3109 case WTAP_ERR_UNSUPPORTED:
3110 /* Seen only when opening a capture file for reading. */
3111 snprintf(errmsg_errno, sizeof(errmsg_errno),
3112 "The file \"%%s\" isn't a capture file in a format Tethereal understands.\n"
3115 errmsg = errmsg_errno;
3118 case WTAP_ERR_CANT_WRITE_TO_PIPE:
3119 /* Seen only when opening a capture file for writing. */
3120 snprintf(errmsg_errno, sizeof(errmsg_errno),
3121 "The file \"%%s\" is a pipe, and %s capture files can't be "
3122 "written to a pipe.", wtap_file_type_string(file_type));
3123 errmsg = errmsg_errno;
3126 case WTAP_ERR_UNSUPPORTED_FILE_TYPE:
3127 /* Seen only when opening a capture file for writing. */
3128 errmsg = "Tethereal doesn't support writing capture files in that format.";
3131 case WTAP_ERR_UNSUPPORTED_ENCAP:
3133 errmsg = "Tethereal can't save this capture in that format.";
3135 snprintf(errmsg_errno, sizeof(errmsg_errno),
3136 "The file \"%%s\" is a capture for a network type that Tethereal doesn't support.\n"
3139 errmsg = errmsg_errno;
3143 case WTAP_ERR_ENCAP_PER_PACKET_UNSUPPORTED:
3145 errmsg = "Tethereal can't save this capture in that format.";
3147 errmsg = "The file \"%s\" is a capture for a network type that Tethereal doesn't support.";
3150 case WTAP_ERR_BAD_RECORD:
3151 /* Seen only when opening a capture file for reading. */
3152 snprintf(errmsg_errno, sizeof(errmsg_errno),
3153 "The file \"%%s\" appears to be damaged or corrupt.\n"
3156 errmsg = errmsg_errno;
3159 case WTAP_ERR_CANT_OPEN:
3161 errmsg = "The file \"%s\" could not be created for some unknown reason.";
3163 errmsg = "The file \"%s\" could not be opened for some unknown reason.";
3166 case WTAP_ERR_SHORT_READ:
3167 errmsg = "The file \"%s\" appears to have been cut short"
3168 " in the middle of a packet or other data.";
3171 case WTAP_ERR_SHORT_WRITE:
3172 errmsg = "A full header couldn't be written to the file \"%s\".";
3176 snprintf(errmsg_errno, sizeof(errmsg_errno),
3177 "The file \"%%s\" could not be %s: %s.",
3178 for_writing ? "created" : "opened",
3179 wtap_strerror(err));
3180 errmsg = errmsg_errno;
3184 errmsg = file_open_error_message(err, for_writing);
3189 * Open/create errors are reported with an console message in Tethereal.
3192 open_failure_message(const char *filename, int err, gboolean for_writing)
3194 fprintf(stderr, "tethereal: ");
3195 fprintf(stderr, file_open_error_message(err, for_writing), filename);
3196 fprintf(stderr, "\n");
3200 cf_open(capture_file *cf, char *fname, gboolean is_tempfile, int *err)
3204 char err_msg[2048+1];
3206 wth = wtap_open_offline(fname, err, &err_info, FALSE);
3210 /* The open succeeded. Fill in the information for this file. */
3212 /* Initialize all data structures used for dissection. */
3216 cf->filed = -1; /* not used, but set it anyway */
3217 cf->f_len = 0; /* not used, but set it anyway */
3219 /* Set the file name because we need it to set the follow stream filter.
3220 XXX - is that still true? We need it for other reasons, though,
3222 cf->filename = g_strdup(fname);
3224 /* Indicate whether it's a permanent or temporary file. */
3225 cf->is_tempfile = is_tempfile;
3227 /* If it's a temporary capture buffer file, mark it as not saved. */
3228 cf->user_saved = !is_tempfile;
3230 cf->cd_t = wtap_file_type(cf->wth);
3232 cf->drops_known = FALSE;
3236 cf->snap = wtap_snapshot_length(cf->wth);
3237 if (cf->snap == 0) {
3238 /* Snapshot length not known. */
3239 cf->has_snap = FALSE;
3240 cf->snap = WTAP_MAX_PACKET_SIZE;
3242 cf->has_snap = TRUE;
3243 firstsec = 0, firstusec = 0;
3244 prevsec = 0, prevusec = 0;
3249 snprintf(err_msg, sizeof err_msg,
3250 cf_open_error_message(*err, err_info, FALSE, 0), fname);
3251 fprintf(stderr, "tethereal: %s\n", err_msg);
3257 /* Take care of byte order in the libpcap headers read from pipes.
3258 * (function taken from wiretap/libpcap.c) */
3260 adjust_header(loop_data *ldat, struct pcap_hdr *hdr, struct pcaprec_hdr *rechdr)
3262 if (ldat->byte_swapped) {
3263 /* Byte-swap the record header fields. */
3264 rechdr->ts_sec = BSWAP32(rechdr->ts_sec);
3265 rechdr->ts_usec = BSWAP32(rechdr->ts_usec);
3266 rechdr->incl_len = BSWAP32(rechdr->incl_len);
3267 rechdr->orig_len = BSWAP32(rechdr->orig_len);
3270 /* In file format version 2.3, the "incl_len" and "orig_len" fields were
3271 swapped, in order to match the BPF header layout.
3273 Unfortunately, some files were, according to a comment in the "libpcap"
3274 source, written with version 2.3 in their headers but without the
3275 interchanged fields, so if "incl_len" is greater than "orig_len" - which
3276 would make no sense - we assume that we need to swap them. */
3277 if (hdr->version_major == 2 &&
3278 (hdr->version_minor < 3 ||
3279 (hdr->version_minor == 3 && rechdr->incl_len > rechdr->orig_len))) {
3282 temp = rechdr->orig_len;
3283 rechdr->orig_len = rechdr->incl_len;
3284 rechdr->incl_len = temp;
3288 /* Mimic pcap_open_live() for pipe captures
3289 * We check if "pipename" is "-" (stdin) or a FIFO, open it, and read the
3291 * N.B. : we can't read the libpcap formats used in RedHat 6.1 or SuSE 6.3
3292 * because we can't seek on pipes (see wiretap/libpcap.c for details) */
3294 pipe_open_live(char *pipename, struct pcap_hdr *hdr, loop_data *ldat,
3295 char *errmsg, int errmsgl)
3297 struct stat pipe_stat;
3301 unsigned int bytes_read;
3304 * XXX Tethereal blocks until we return
3306 if (strcmp(pipename, "-") == 0)
3307 fd = 0; /* read from stdin */
3309 if (stat(pipename, &pipe_stat) < 0) {
3310 if (errno == ENOENT || errno == ENOTDIR)
3311 ldat->pipe_err = PIPNEXIST;
3313 snprintf(errmsg, errmsgl,
3314 "The capture session could not be initiated "
3315 "due to error on pipe: %s", strerror(errno));
3316 ldat->pipe_err = PIPERR;
3320 if (! S_ISFIFO(pipe_stat.st_mode)) {
3321 if (S_ISCHR(pipe_stat.st_mode)) {
3323 * Assume the user specified an interface on a system where
3324 * interfaces are in /dev. Pretend we haven't seen it.
3326 ldat->pipe_err = PIPNEXIST;
3328 snprintf(errmsg, errmsgl,
3329 "The capture session could not be initiated because\n"
3330 "\"%s\" is neither an interface nor a pipe", pipename);
3331 ldat->pipe_err = PIPERR;
3335 fd = open(pipename, O_RDONLY);
3337 snprintf(errmsg, errmsgl,
3338 "The capture session could not be initiated "
3339 "due to error on pipe open: %s", strerror(errno));
3340 ldat->pipe_err = PIPERR;
3345 ldat->from_pipe = TRUE;
3347 /* read the pcap header */
3349 while (bytes_read < sizeof magic) {
3350 b = read(fd, ((char *)&magic)+bytes_read, sizeof magic-bytes_read);
3353 snprintf(errmsg, errmsgl, "End of file on pipe during open");
3355 snprintf(errmsg, errmsgl, "Error on pipe during open: %s",
3364 /* Host that wrote it has our byte order, and was running
3365 a program using either standard or ss990417 libpcap. */
3366 ldat->byte_swapped = FALSE;
3367 ldat->modified = FALSE;
3369 case PCAP_MODIFIED_MAGIC:
3370 /* Host that wrote it has our byte order, but was running
3371 a program using either ss990915 or ss991029 libpcap. */
3372 ldat->byte_swapped = FALSE;
3373 ldat->modified = TRUE;
3375 case PCAP_SWAPPED_MAGIC:
3376 /* Host that wrote it has a byte order opposite to ours,
3377 and was running a program using either standard or
3378 ss990417 libpcap. */
3379 ldat->byte_swapped = TRUE;
3380 ldat->modified = FALSE;
3382 case PCAP_SWAPPED_MODIFIED_MAGIC:
3383 /* Host that wrote it out has a byte order opposite to
3384 ours, and was running a program using either ss990915
3385 or ss991029 libpcap. */
3386 ldat->byte_swapped = TRUE;
3387 ldat->modified = TRUE;
3390 /* Not a "libpcap" type we know about. */
3391 snprintf(errmsg, errmsgl, "Unrecognized libpcap format");
3395 /* Read the rest of the header */
3397 while (bytes_read < sizeof(struct pcap_hdr)) {
3398 b = read(fd, ((char *)hdr)+bytes_read,
3399 sizeof(struct pcap_hdr) - bytes_read);
3402 snprintf(errmsg, errmsgl, "End of file on pipe during open");
3404 snprintf(errmsg, errmsgl, "Error on pipe during open: %s",
3411 if (ldat->byte_swapped) {
3412 /* Byte-swap the header fields about which we care. */
3413 hdr->version_major = BSWAP16(hdr->version_major);
3414 hdr->version_minor = BSWAP16(hdr->version_minor);
3415 hdr->snaplen = BSWAP32(hdr->snaplen);
3416 hdr->network = BSWAP32(hdr->network);
3419 if (hdr->version_major < 2) {
3420 snprintf(errmsg, errmsgl, "Unable to read old libpcap format");
3424 ldat->pipe_state = STATE_EXPECT_REC_HDR;
3425 ldat->pipe_err = PIPOK;
3429 ldat->pipe_err = PIPERR;
3434 /* We read one record from the pipe, take care of byte order in the record
3435 * header, write the record in the capture file, and update capture statistics. */
3438 pipe_dispatch(int fd, loop_data *ldat, struct pcap_hdr *hdr,
3439 struct pcaprec_modified_hdr *rechdr, guchar *data,
3440 char *errmsg, int errmsgl)
3442 struct pcap_pkthdr phdr;
3444 enum { PD_REC_HDR_READ, PD_DATA_READ, PD_PIPE_EOF, PD_PIPE_ERR,
3447 switch (ldat->pipe_state) {
3449 case STATE_EXPECT_REC_HDR:
3450 ldat->bytes_to_read = ldat->modified ?
3451 sizeof(struct pcaprec_modified_hdr) : sizeof(struct pcaprec_hdr);
3452 ldat->bytes_read = 0;
3453 ldat->pipe_state = STATE_READ_REC_HDR;
3456 case STATE_READ_REC_HDR:
3457 b = read(fd, ((char *)rechdr)+ldat->bytes_read,
3458 ldat->bytes_to_read - ldat->bytes_read);
3461 result = PD_PIPE_EOF;
3463 result = PD_PIPE_ERR;
3466 if ((ldat->bytes_read += b) < ldat->bytes_to_read)
3468 result = PD_REC_HDR_READ;
3471 case STATE_EXPECT_DATA:
3472 ldat->bytes_read = 0;
3473 ldat->pipe_state = STATE_READ_DATA;
3476 case STATE_READ_DATA:
3477 b = read(fd, data+ldat->bytes_read, rechdr->hdr.incl_len - ldat->bytes_read);
3480 result = PD_PIPE_EOF;
3482 result = PD_PIPE_ERR;
3485 if ((ldat->bytes_read += b) < rechdr->hdr.incl_len)
3487 result = PD_DATA_READ;
3491 snprintf(errmsg, errmsgl, "pipe_dispatch: invalid state");
3494 } /* switch (ldat->pipe_state) */
3497 * We've now read as much data as we were expecting, so process it.
3501 case PD_REC_HDR_READ:
3502 /* We've read the header. Take care of byte order. */
3503 adjust_header(ldat, hdr, &rechdr->hdr);
3504 if (rechdr->hdr.incl_len > WTAP_MAX_PACKET_SIZE) {
3505 snprintf(errmsg, errmsgl, "Frame %u too long (%d bytes)",
3506 ldat->packet_count+1, rechdr->hdr.incl_len);
3509 ldat->pipe_state = STATE_EXPECT_DATA;
3513 /* Fill in a "struct pcap_pkthdr", and process the packet. */
3514 phdr.ts.tv_sec = rechdr->hdr.ts_sec;
3515 phdr.ts.tv_usec = rechdr->hdr.ts_usec;
3516 phdr.caplen = rechdr->hdr.incl_len;
3517 phdr.len = rechdr->hdr.orig_len;
3519 capture_pcap_cb((guchar *)ldat, &phdr, data);
3521 ldat->pipe_state = STATE_EXPECT_REC_HDR;
3525 ldat->pipe_err = PIPEOF;
3529 snprintf(errmsg, errmsgl, "Error reading from pipe: %s",
3536 ldat->pipe_err = PIPERR;
3537 /* Return here rather than inside the switch to prevent GCC warning */
3541 #endif /* HAVE_LIBPCAP */
3544 * General errors are reported with an console message in Tethereal.
3547 failure_message(const char *msg_format, va_list ap)
3549 fprintf(stderr, "tethereal: ");
3550 vfprintf(stderr, msg_format, ap);
3551 fprintf(stderr, "\n");
3555 * Read errors are reported with an console message in Tethereal.
3558 read_failure_message(const char *filename, int err)
3560 fprintf(stderr, "tethereal: An error occurred while reading from the file \"%s\": %s.\n",
3561 filename, strerror(err));