5 * Ethereal - Network traffic analyzer
6 * By Gerald Combs <gerald@ethereal.com>
7 * Copyright 1998 Gerald Combs
9 * Text-mode variant, by Gilbert Ramirez <gram@alumni.rice.edu>
10 * and Guy Harris <guy@alum.mit.edu>.
12 * This program is free software; you can redistribute it and/or
13 * modify it under the terms of the GNU General Public License
14 * as published by the Free Software Foundation; either version 2
15 * of the License, or (at your option) any later version.
17 * This program is distributed in the hope that it will be useful,
18 * but WITHOUT ANY WARRANTY; without even the implied warranty of
19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
20 * GNU General Public License for more details.
22 * You should have received a copy of the GNU General Public License
23 * along with this program; if not, write to the Free Software
24 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
55 #ifdef HAVE_SYS_STAT_H
56 # include <sys/stat.h>
59 #ifdef NEED_SNPRINTF_H
60 # include "snprintf.h"
63 #ifdef NEED_STRERROR_H
71 #include "svnversion.h"
74 #include <epan/epan.h>
75 #include <epan/filesystem.h>
78 #include <epan/timestamp.h>
79 #include <epan/packet.h>
81 #include "disabled_protos.h"
82 #include <epan/prefs.h>
83 #include <epan/column.h>
85 #include <epan/addr_resolv.h>
87 #include "clopts_common.h"
88 #include "version_info.h"
90 #include "pcap-util.h"
92 #include <epan/conversation.h>
93 #include <epan/plugins.h>
95 #include "conditions.h"
96 #include "capture_stop_conditions.h"
97 #include "ringbuffer.h"
98 #include "capture_ui_utils.h"
99 #include <epan/epan_dissect.h>
100 #include <epan/tap.h>
101 #include <epan/timestamp.h>
104 #include <wiretap/wtap-capture.h>
105 #include <wiretap/libpcap.h>
109 #include "capture-wpcap.h"
113 * This is the template for the decode as option; it is shared between the
114 * various functions that output the usage for this parameter.
116 static const gchar decode_as_arg_template[] = "<layer_type>==<selector>,<decode_as_protocol>";
118 static guint32 firstsec, firstusec;
119 static guint32 prevsec, prevusec;
120 static GString *comp_info_str, *runtime_info_str;
122 static gboolean print_packet_info; /* TRUE if we're to print packet information */
124 * The way the packet decode is to be written.
127 WRITE_TEXT, /* summary or detail text */
128 WRITE_XML /* PDML or PSML */
129 /* Add CSV and the like here */
131 static output_action_e output_action;
132 static gboolean do_dissection; /* TRUE if we have to dissect each packet */
133 static gboolean verbose;
134 static gboolean print_hex;
135 static gboolean line_buffered;
136 static guint32 cum_bytes = 0;
137 static print_format_e print_format = PR_FMT_TEXT;
138 static print_stream_t *print_stream;
142 * TRUE if we're to print packet counts to keep track of captured packets.
144 static gboolean print_packet_counts;
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 */
151 char *save_file; /* Name of file to which we're writing */
154 gboolean output_to_pipe;
157 gboolean modified; /* TRUE if data in the pipe uses modified pcap headers */
158 gboolean byte_swapped; /* TRUE if data in the pipe is byte swapped */
159 unsigned int bytes_to_read, bytes_read; /* Used by pipe_dispatch */
161 STATE_EXPECT_REC_HDR, STATE_READ_REC_HDR,
162 STATE_EXPECT_DATA, STATE_READ_DATA
164 enum { PIPOK, PIPEOF, PIPERR, PIPNEXIST } pipe_err;
172 gchar *cfilter; /* Capture filter string */
173 gchar *iface; /* the network interface to capture from */
174 int snaplen; /* Maximum captured packet length */
175 int promisc_mode; /* Capture in promiscuous mode */
176 int autostop_count; /* Maximum packet count */
177 gboolean has_autostop_duration; /* TRUE if maximum capture duration
179 gint32 autostop_duration; /* Maximum capture duration */
180 gboolean has_autostop_filesize; /* TRUE if maximum capture file size
182 gint32 autostop_filesize; /* Maximum capture file size */
183 gboolean ringbuffer_on; /* TRUE if ring buffer in use */
184 guint32 ringbuffer_num_files; /* Number of ring buffer files */
185 gboolean has_ring_duration; /* TRUE if ring duration specified */
186 gint32 ringbuffer_duration; /* Switch file after n seconds */
187 int linktype; /* Data link type to use, or -1 for
191 static capture_options capture_opts = {
192 "", /* No capture filter string specified */
193 NULL, /* Default is "pick the first interface" */
194 WTAP_MAX_PACKET_SIZE, /* snapshot length - default is
195 infinite, in effect */
196 TRUE, /* promiscuous mode is the default */
197 0, /* max packet count - default is 0,
199 FALSE, /* maximum capture duration not
200 specified by default */
201 0, /* maximum capture duration */
202 FALSE, /* maximum capture file size not
203 specified by default */
204 0, /* maximum capture file size */
205 FALSE, /* ring buffer off by default */
206 RINGBUFFER_MIN_NUM_FILES, /* default number of ring buffer files */
207 FALSE, /* Switch ring file after some */
208 0, /* specified time is off by default */
209 -1 /* Default to not change link type */
212 static gboolean list_link_layer_types;
215 static gboolean infodelay; /* if TRUE, don't print capture info in SIGINFO handler */
216 static gboolean infoprint; /* if TRUE, print capture info after clearing infodelay */
218 #endif /* HAVE_LIBPCAP */
221 static int capture(char *, int);
222 static void capture_pcap_cb(guchar *, const struct pcap_pkthdr *,
224 static void report_counts(void);
226 static BOOL WINAPI capture_cleanup(DWORD);
228 static void capture_cleanup(int);
230 static void report_counts_siginfo(int);
233 #endif /* HAVE_LIBPCAP */
235 static int load_cap_file(capture_file *, char *, int);
236 static gboolean process_packet(capture_file *cf, wtap_dumper *pdh, long offset,
237 const struct wtap_pkthdr *whdr, union wtap_pseudo_header *pseudo_header,
238 const guchar *pd, int *err);
239 static void show_capture_file_io_error(const char *, int, gboolean);
240 static void show_print_file_io_error(int err);
241 static gboolean write_preamble(capture_file *cf);
242 static gboolean print_packet(capture_file *cf, epan_dissect_t *edt);
243 static gboolean write_finale(void);
244 static char *cf_open_error_message(int err, gchar *err_info,
245 gboolean for_writing, int file_type);
248 static void adjust_header(loop_data *, struct pcap_hdr *, struct pcaprec_hdr *);
249 static int pipe_open_live(char *, struct pcap_hdr *, loop_data *, char *, int);
250 static int pipe_dispatch(int, loop_data *, struct pcap_hdr *, \
251 struct pcaprec_modified_hdr *, guchar *, char *, int);
255 static void open_failure_message(const char *filename, int err,
256 gboolean for_writing);
257 static void failure_message(const char *msg_format, va_list ap);
258 static void read_failure_message(const char *filename, int err);
264 print_usage(gboolean print_ver)
271 fprintf(output, "This is GNU t" PACKAGE " " VERSION
275 "\n (C) 1998-2004 Gerald Combs <gerald@ethereal.com>"
278 comp_info_str->str, runtime_info_str->str);
283 fprintf(output, "\nt%s [ -vh ] [ -DlLnpqSVx ] [ -a <capture autostop condition> ] ...\n",
285 fprintf(output, "\t[ -b <number of ring buffer files>[:<duration>] ] [ -c <count> ]\n");
286 fprintf(output, "\t[ -d %s ] ...\n", decode_as_arg_template);
287 fprintf(output, "\t[ -f <capture filter> ] [ -F <output file type> ] [ -i <interface> ]\n");
288 fprintf(output, "\t[ -N <resolving> ] [ -o <preference setting> ] ... [ -r <infile> ]\n");
289 fprintf(output, "\t[ -R <read filter> ] [ -s <snaplen> ] [ -t <time stamp format> ]\n");
290 fprintf(output, "\t[ -T pdml|ps|psml|text ] [ -w <savefile> ] [ -y <link type> ]\n");
291 fprintf(output, "\t[ -z <statistics string> ]\n");
293 fprintf(output, "\nt%s [ -vh ] [ -lnVx ]\n", PACKAGE);
294 fprintf(output, "\t[ -d %s ] ...\n", decode_as_arg_template);
295 fprintf(output, "\t[ -F <output file type> ] [ -N <resolving> ]\n");
296 fprintf(output, "\t[ -o <preference setting> ] ... [ -r <infile> ] [ -R <read filter> ]\n");
297 fprintf(output, "\t[ -t <time stamp format> ] [ -T pdml|ps|psml|text ] [ -w <savefile> ]\n");
298 fprintf(output, "\t[ -z <statistics string> ]\n");
300 fprintf(output, "Valid file type arguments to the \"-F\" flag:\n");
301 for (i = 0; i < WTAP_NUM_FILE_TYPES; i++) {
302 if (wtap_dump_can_open(i))
303 fprintf(output, "\t%s - %s\n",
304 wtap_file_type_short_string(i), wtap_file_type_string(i));
306 fprintf(output, "\tdefault is libpcap\n");
311 get_natural_int(const char *string, const char *name)
316 number = strtol(string, &p, 10);
317 if (p == string || *p != '\0') {
318 fprintf(stderr, "tethereal: The specified %s \"%s\" isn't a decimal number\n",
323 fprintf(stderr, "tethereal: The specified %s is a negative number\n",
327 if (number > INT_MAX) {
328 fprintf(stderr, "tethereal: The specified %s is too large (greater than %d)\n",
336 get_positive_int(const char *string, const char *name)
340 number = get_natural_int(string, name);
343 fprintf(stderr, "tethereal: The specified %s is zero\n",
352 * Given a string of the form "<autostop criterion>:<value>", as might appear
353 * as an argument to a "-a" option, parse it and set the criterion in
354 * question. Return an indication of whether it succeeded or failed
358 set_autostop_criterion(const char *autostoparg)
362 colonp = strchr(autostoparg, ':');
370 * Skip over any white space (there probably won't be any, but
371 * as we allow it in the preferences file, we might as well
378 * Put the colon back, so if our caller uses, in an
379 * error message, the string they passed us, the message
385 if (strcmp(autostoparg,"duration") == 0) {
386 capture_opts.has_autostop_duration = TRUE;
387 capture_opts.autostop_duration = get_positive_int(p,"autostop duration");
388 } else if (strcmp(autostoparg,"filesize") == 0) {
389 capture_opts.has_autostop_filesize = TRUE;
390 capture_opts.autostop_filesize = get_positive_int(p,"autostop filesize");
394 *colonp = ':'; /* put the colon back */
399 * Given a string of the form "<ring buffer file>:<duration>", as might appear
400 * as an argument to a "-b" option, parse it and set the arguments in
401 * question. Return an indication of whether it succeeded or failed
405 get_ring_arguments(const char *arg)
407 guchar *p = NULL, *colonp;
409 colonp = strchr(arg, ':');
411 if (colonp != NULL) {
416 capture_opts.ringbuffer_num_files =
417 get_natural_int(arg, "number of ring buffer files");
423 * Skip over any white space (there probably won't be any, but
424 * as we allow it in the preferences file, we might as well
431 * Put the colon back, so if our caller uses, in an
432 * error message, the string they passed us, the message
439 capture_opts.has_ring_duration = TRUE;
440 capture_opts.ringbuffer_duration = get_positive_int(p,
441 "ring buffer duration");
443 *colonp = ':'; /* put the colon back */
448 /* structure to keep track of what tap listeners have been registered.
450 typedef struct _ethereal_tap_list {
451 struct _ethereal_tap_list *next;
453 void (*func)(char *arg);
455 static ethereal_tap_list *tap_list=NULL;
458 register_ethereal_tap(char *cmd, void (*func)(char *arg))
460 ethereal_tap_list *newtl;
462 newtl=malloc(sizeof(ethereal_tap_list));
463 newtl->next=tap_list;
471 * For a dissector table, print on the stream described by output,
472 * its short name (which is what's used in the "-d" option) and its
476 display_dissector_table_names(char *table_name, char *ui_name, gpointer output)
478 fprintf((FILE *)output, "\t%s (%s)\n", table_name, ui_name);
482 * For a dissector handle, print on the stream described by output,
483 * the filter name (which is what's used in the "-d" option) and the full
484 * name for the protocol that corresponds to this handle.
487 display_dissector_names(gchar *table _U_, gpointer handle, gpointer output)
490 const gchar* proto_filter_name;
491 const gchar* proto_ui_name;
493 proto_id = dissector_handle_get_protocol_index((dissector_handle_t)handle);
495 if (proto_id != -1) {
496 proto_filter_name = proto_get_protocol_filter_name(proto_id);
497 proto_ui_name = proto_get_protocol_name(proto_id);
498 g_assert(proto_filter_name != NULL);
499 g_assert(proto_ui_name != NULL);
501 fprintf((FILE *)output, "\t%s (%s)\n",
508 * The protocol_name_search structure is used by find_protocol_name_func()
509 * to pass parameters and store results
511 struct protocol_name_search{
512 gchar *searched_name; /* Protocol filter name we are looking for */
513 dissector_handle_t matched_handle; /* Handle for a dissector whose protocol has the specified filter name */
514 guint nb_match; /* How many dissectors matched searched_name */
516 typedef struct protocol_name_search *protocol_name_search_t;
519 * This function parses all dissectors associated with a table to find the
520 * one whose protocol has the specified filter name. It is called
521 * as a reference function in a call to dissector_table_foreach_handle.
522 * The name we are looking for, as well as the results, are stored in the
523 * protocol_name_search struct pointed to by user_data.
524 * If called using dissector_table_foreach_handle, we actually parse the
525 * whole list of dissectors.
528 find_protocol_name_func(gchar *table _U_, gpointer handle, gpointer user_data)
532 const gchar *protocol_filter_name;
533 protocol_name_search_t search_info;
537 search_info = (protocol_name_search_t)user_data;
539 proto_id = dissector_handle_get_protocol_index((dissector_handle_t)handle);
540 if (proto_id != -1) {
541 protocol_filter_name = proto_get_protocol_filter_name(proto_id);
542 g_assert(protocol_filter_name != NULL);
543 if (strcmp(protocol_filter_name, search_info->searched_name) == 0) {
545 if (search_info->nb_match == 0) {
546 /* Record this handle only if this is the first match */
547 search_info->matched_handle = (dissector_handle_t)handle; /* Record the handle for this matching dissector */
549 search_info->nb_match++;
555 * Print all layer type names supported.
556 * We send the output to the stream described by the handle output.
560 fprint_all_layer_types(FILE *output)
563 dissector_all_tables_foreach_table(display_dissector_table_names, (gpointer)output);
567 * Print all protocol names supported for a specific layer type.
568 * table_name contains the layer type name in which the search is performed.
569 * We send the output to the stream described by the handle output.
573 fprint_all_protocols_for_layer_types(FILE *output, gchar *table_name)
576 dissector_table_foreach_handle(table_name,
577 display_dissector_names,
582 * The function below parses the command-line parameters for the decode as
583 * feature (a string pointer by cl_param).
584 * It checks the format of the command-line, searches for a matching table
585 * and dissector. If a table/dissector match is not found, we display a
586 * summary of the available tables/dissectors (on stderr) and return FALSE.
587 * If everything is fine, we get the "Decode as" preference activated,
588 * then we return TRUE.
591 add_decode_as(const gchar *cl_param)
595 gchar *decoded_param;
596 gchar *remaining_param;
598 gchar *dissector_str;
599 dissector_handle_t dissector_matching;
600 dissector_table_t table_matching;
601 ftenum_t dissector_table_selector_type;
602 struct protocol_name_search user_protocol_name;
604 /* The following code will allocate and copy the command-line options in a string pointed by decoded_param */
607 decoded_param = g_malloc( sizeof(gchar) * (strlen(cl_param) + 1) ); /* Allocate enough space to have a working copy of the command-line parameter */
608 g_assert(decoded_param);
609 strcpy(decoded_param, cl_param);
612 /* The lines below will parse this string (modifying it) to extract all
613 necessary information. Note that decoded_param is still needed since
614 strings are not copied - we just save pointers. */
616 /* This section extracts a layer type (table_name) from decoded_param */
617 table_name = decoded_param; /* Layer type string starts from beginning */
619 remaining_param = strchr(table_name, '=');
620 if (remaining_param == NULL) {
621 fprintf(stderr, "tethereal: Parameter \"%s\" doesn't follow the template \"%s\"\n", cl_param, decode_as_arg_template);
622 /* If the argument does not follow the template, carry on anyway to check
623 if the table name is at least correct. If remaining_param is NULL,
624 we'll exit anyway further down */
627 *remaining_param = '\0'; /* Terminate the layer type string (table_name) where '=' was detected */
630 /* Remove leading and trailing spaces from the table name */
631 while ( table_name[0] == ' ' )
633 while ( table_name[strlen(table_name) - 1] == ' ' )
634 table_name[strlen(table_name) - 1] = '\0'; /* Note: if empty string, while loop will eventually exit */
636 /* The following part searches a table matching with the layer type specified */
637 table_matching = NULL;
639 /* Look for the requested table */
640 if ( !(*(table_name)) ) { /* Is the table name empty, if so, don't even search for anything, display a message */
641 fprintf(stderr, "tethereal: No layer type specified\n"); /* Note, we don't exit here, but table_matching will remain NULL, so we exit below */
644 table_matching = find_dissector_table(table_name);
645 if (!table_matching) {
646 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 */
650 if (!table_matching) {
651 /* Display a list of supported layer types to help the user, if the
652 specified layer type was not found */
653 fprintf(stderr, "tethereal: Valid layer types are:\n");
654 fprint_all_layer_types(stderr);
656 if (remaining_param == NULL || !table_matching) {
657 /* Exit if the layer type was not found, or if no '=' separator was found
659 g_free(decoded_param);
663 if (*(remaining_param + 1) != '=') { /* Check for "==" and not only '=' */
664 fprintf(stderr, "tethereal: WARNING: -d requires \"==\" instead of \"=\". Option will be treated as \"%s==%s\"\n", table_name, remaining_param + 1);
667 remaining_param++; /* Move to the second '=' */
668 *remaining_param = '\0'; /* Remove the second '=' */
670 remaining_param++; /* Position after the layer type string */
672 /* This section extracts a selector value (selector_str) from decoded_param */
674 selector_str = remaining_param; /* Next part starts with the selector number */
676 remaining_param = strchr(selector_str, ',');
677 if (remaining_param == NULL) {
678 fprintf(stderr, "tethereal: Parameter \"%s\" doesn't follow the template \"%s\"\n", cl_param, decode_as_arg_template);
679 /* If the argument does not follow the template, carry on anyway to check
680 if the selector value is at least correct. If remaining_param is NULL,
681 we'll exit anyway further down */
684 *remaining_param = '\0'; /* Terminate the selector number string (selector_str) where ',' was detected */
687 dissector_table_selector_type = get_dissector_table_selector_type(table_name);
689 switch (dissector_table_selector_type) {
695 /* The selector for this table is an unsigned number. Parse it as such.
696 There's no need to remove leading and trailing spaces from the
697 selector number string, because sscanf will do that for us. */
698 if ( sscanf(selector_str, "%u", &selector) != 1 ) {
699 fprintf(stderr, "tethereal: Invalid selector number \"%s\"\n", selector_str);
700 g_free(decoded_param);
707 /* The selector for this table is a string. */
711 /* There are currently no dissector tables with any types other
712 than the ones listed above. */
713 g_assert_not_reached();
716 if (remaining_param == NULL) {
717 /* Exit if no ',' separator was found (see above) */
718 fprintf(stderr, "tethereal: Valid protocols for layer type \"%s\" are:\n", table_name);
719 fprint_all_protocols_for_layer_types(stderr, table_name);
720 g_free(decoded_param);
724 remaining_param++; /* Position after the selector number string */
726 /* This section extracts a protocol filter name (dissector_str) from decoded_param */
728 dissector_str = remaining_param; /* All the rest of the string is the dissector (decode as protocol) name */
730 /* Remove leading and trailing spaces from the dissector name */
731 while ( dissector_str[0] == ' ' )
733 while ( dissector_str[strlen(dissector_str) - 1] == ' ' )
734 dissector_str[strlen(dissector_str) - 1] = '\0'; /* Note: if empty string, while loop will eventually exit */
736 dissector_matching = NULL;
738 /* We now have a pointer to the handle for the requested table inside the variable table_matching */
739 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 */
740 fprintf(stderr, "tethereal: No protocol name specified\n"); /* Note, we don't exit here, but dissector_matching will remain NULL, so we exit below */
743 user_protocol_name.nb_match = 0;
744 user_protocol_name.searched_name = dissector_str;
745 user_protocol_name.matched_handle = NULL;
747 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 */
749 if (user_protocol_name.nb_match != 0) {
750 dissector_matching = user_protocol_name.matched_handle;
751 if (user_protocol_name.nb_match > 1) {
752 fprintf(stderr, "tethereal: WARNING: Protocol \"%s\" matched %u dissectors, first one will be used\n", dissector_str, user_protocol_name.nb_match);
756 /* OK, check whether the problem is that there isn't any such
757 protocol, or that there is but it's not specified as a protocol
758 that's valid for that dissector table.
759 Note, we don't exit here, but dissector_matching will remain NULL,
761 if (proto_get_id_by_filter_name(dissector_str) == -1) {
762 /* No such protocol */
763 fprintf(stderr, "tethereal: Unknown protocol -- \"%s\"\n", dissector_str);
765 fprintf(stderr, "tethereal: Protocol \"%s\" isn't valid for layer type \"%s\"\n",
766 dissector_str, table_name);
771 if (!dissector_matching) {
772 fprintf(stderr, "tethereal: Valid protocols for layer type \"%s\" are:\n", table_name);
773 fprint_all_protocols_for_layer_types(stderr, table_name);
774 g_free(decoded_param);
778 /* This is the end of the code that parses the command-line options.
779 All information is now stored in the variables:
783 The above variables that are strings are still pointing to areas within
784 decoded_parm. decoded_parm thus still needs to be kept allocated in
785 until we stop needing these variables
786 decoded_param will be deallocated at each exit point of this function */
789 /* We now have a pointer to the handle for the requested dissector
790 (requested protocol) inside the variable dissector_matching */
791 switch (dissector_table_selector_type) {
797 /* The selector for this table is an unsigned number. */
798 dissector_change(table_name, selector, dissector_matching);
803 /* The selector for this table is a string. */
804 dissector_change_string(table_name, selector_str, dissector_matching);
808 /* There are currently no dissector tables with any types other
809 than the ones listed above. */
810 g_assert_not_reached();
812 g_free(decoded_param); /* "Decode As" rule has been succesfully added */
817 main(int argc, char *argv[])
821 gboolean arg_error = FALSE;
827 char *gpf_path, *pf_path;
828 char *gdp_path, *dp_path;
829 int gpf_open_errno, gpf_read_errno;
830 int pf_open_errno, pf_read_errno;
831 int gdp_open_errno, gdp_read_errno;
832 int dp_open_errno, dp_read_errno;
835 gboolean capture_filter_specified = FALSE;
836 GList *if_list, *if_entry;
840 gchar err_str[PCAP_ERRBUF_SIZE];
841 gchar *cant_get_if_list_errstr;
843 gboolean capture_option_specified = FALSE;
845 gboolean quiet = FALSE;
846 gchar *save_file = NULL;
847 int out_file_type = WTAP_FILE_PCAP;
848 gchar *cf_name = NULL, *rfilter = NULL;
851 GList *lt_list, *lt_entry;
852 data_link_info_t *data_link_info;
854 #ifdef HAVE_PCAP_OPEN_DEAD
855 struct bpf_program fcode;
857 dfilter_t *rfcode = NULL;
860 ethereal_tap_list *tli;
863 /* XXX - better use capture_opts_init instead */
864 capture_opts.cfilter = g_strdup("");
867 set_timestamp_setting(TS_RELATIVE);
869 /* Register all dissectors; we must do this before checking for the
870 "-G" flag, as the "-G" flag dumps information registered by the
871 dissectors, and we must do it before we read the preferences, in
872 case any dissectors register preferences. */
873 epan_init(PLUGIN_DIR,register_all_protocols,register_all_protocol_handoffs,
874 failure_message,open_failure_message,read_failure_message);
876 /* Register all tap listeners; we do this before we parse the arguments,
877 as the "-z" argument can specify a registered tap. */
878 register_all_tap_listeners();
880 /* Now register the preferences for any non-dissector modules.
881 We must do that before we read the preferences as well. */
882 prefs_register_modules();
884 /* If invoked with the "-G" flag, we dump out information based on
885 the argument to the "-G" flag; if no argument is specified,
886 for backwards compatibility we dump out a glossary of display
889 We do this here to mirror what happens in the GTK+ version, although
890 it's not necessary here. */
891 handle_dashG_option(argc, argv, "tethereal");
893 /* Set the C-language locale to the native environment. */
894 setlocale(LC_ALL, "");
896 prefs = read_prefs(&gpf_open_errno, &gpf_read_errno, &gpf_path,
897 &pf_open_errno, &pf_read_errno, &pf_path);
898 if (gpf_path != NULL) {
899 if (gpf_open_errno != 0) {
900 fprintf(stderr, "Can't open global preferences file \"%s\": %s.\n",
901 pf_path, strerror(gpf_open_errno));
903 if (gpf_read_errno != 0) {
904 fprintf(stderr, "I/O error reading global preferences file \"%s\": %s.\n",
905 pf_path, strerror(gpf_read_errno));
908 if (pf_path != NULL) {
909 if (pf_open_errno != 0) {
910 fprintf(stderr, "Can't open your preferences file \"%s\": %s.\n", pf_path,
911 strerror(pf_open_errno));
913 if (pf_read_errno != 0) {
914 fprintf(stderr, "I/O error reading your preferences file \"%s\": %s.\n",
915 pf_path, strerror(pf_read_errno));
921 /* Set the name resolution code's flags from the preferences. */
922 g_resolv_flags = prefs->name_resolve;
924 /* Read the disabled protocols file. */
925 read_disabled_protos_list(&gdp_path, &gdp_open_errno, &gdp_read_errno,
926 &dp_path, &dp_open_errno, &dp_read_errno);
927 if (gdp_path != NULL) {
928 if (gdp_open_errno != 0) {
930 "Could not open global disabled protocols file\n\"%s\": %s.\n",
931 gdp_path, strerror(gdp_open_errno));
933 if (gdp_read_errno != 0) {
935 "I/O error reading global disabled protocols file\n\"%s\": %s.\n",
936 gdp_path, strerror(gdp_read_errno));
940 if (dp_path != NULL) {
941 if (dp_open_errno != 0) {
943 "Could not open your disabled protocols file\n\"%s\": %s.\n", dp_path,
944 strerror(dp_open_errno));
946 if (dp_read_errno != 0) {
948 "I/O error reading your disabled protocols file\n\"%s\": %s.\n", dp_path,
949 strerror(dp_read_errno));
955 /* Load Wpcap, if possible */
959 init_cap_file(&cfile);
961 /* Assemble the compile-time version information string */
962 comp_info_str = g_string_new("Compiled ");
963 get_compiled_version_info(comp_info_str);
965 /* Assemble the run-time version information string */
966 runtime_info_str = g_string_new("Running ");
967 get_runtime_version_info(runtime_info_str);
969 /* Print format defaults to this. */
970 print_format = PR_FMT_TEXT;
972 /* Now get our args */
973 while ((opt = getopt(argc, argv, "a:b:c:d:Df:F:hi:lLnN:o:pqr:R:s:St:T:vw:Vxy:z:")) != -1) {
975 case 'a': /* autostop criteria */
977 if (set_autostop_criterion(optarg) == FALSE) {
978 fprintf(stderr, "tethereal: Invalid or unknown -a flag \"%s\"\n", optarg);
982 capture_option_specified = TRUE;
986 case 'b': /* Ringbuffer option */
988 capture_opts.ringbuffer_on = TRUE;
989 if (get_ring_arguments(optarg) == FALSE) {
990 fprintf(stderr, "tethereal: Invalid or unknown -b arg \"%s\"\n", optarg);
994 capture_option_specified = TRUE;
998 case 'c': /* Capture xxx packets */
1000 capture_opts.autostop_count =
1001 get_positive_int(optarg, "packet count");
1003 capture_option_specified = TRUE;
1007 case 'd': /* Decode as rule */
1008 if (!add_decode_as(optarg))
1011 case 'D': /* Print a list of capture devices */
1013 if_list = get_interface_list(&err, err_str);
1014 if (if_list == NULL) {
1017 case CANT_GET_INTERFACE_LIST:
1018 cant_get_if_list_errstr =
1019 cant_get_if_list_error_message(err_str);
1020 fprintf(stderr, "tethereal: %s\n", cant_get_if_list_errstr);
1021 g_free(cant_get_if_list_errstr);
1024 case NO_INTERFACES_FOUND:
1025 fprintf(stderr, "tethereal: There are no interfaces on which a capture can be done\n");
1030 i = 1; /* Interface id number */
1031 for (if_entry = g_list_first(if_list); if_entry != NULL;
1032 if_entry = g_list_next(if_entry)) {
1033 if_info = if_entry->data;
1034 printf("%d. %s", i++, if_info->name);
1035 if (if_info->description != NULL)
1036 printf(" (%s)", if_info->description);
1039 free_interface_list(if_list);
1042 capture_option_specified = TRUE;
1048 capture_filter_specified = TRUE;
1049 if (capture_opts.cfilter)
1050 g_free(capture_opts.cfilter);
1051 capture_opts.cfilter = g_strdup(optarg);
1053 capture_option_specified = TRUE;
1058 out_file_type = wtap_short_string_to_file_type(optarg);
1059 if (out_file_type < 0) {
1060 fprintf(stderr, "tethereal: \"%s\" isn't a valid capture file type\n",
1065 case 'h': /* Print help and exit */
1069 case 'i': /* Use interface xxx */
1072 * If the argument is a number, treat it as an index into the list
1073 * of adapters, as printed by "tethereal -D".
1075 * This should be OK on UNIX systems, as interfaces shouldn't have
1076 * names that begin with digits. It can be useful on Windows, where
1077 * more than one interface can have the same name.
1079 adapter_index = strtol(optarg, &p, 10);
1080 if (p != NULL && *p == '\0') {
1081 if (adapter_index < 0) {
1083 "tethereal: The specified adapter index is a negative number\n");
1086 if (adapter_index > INT_MAX) {
1088 "tethereal: The specified adapter index is too large (greater than %d)\n",
1092 if (adapter_index == 0) {
1093 fprintf(stderr, "tethereal: there is no interface with that adapter index\n");
1096 if_list = get_interface_list(&err, err_str);
1097 if (if_list == NULL) {
1100 case CANT_GET_INTERFACE_LIST:
1101 cant_get_if_list_errstr =
1102 cant_get_if_list_error_message(err_str);
1103 fprintf(stderr, "tethereal: %s\n", cant_get_if_list_errstr);
1104 g_free(cant_get_if_list_errstr);
1107 case NO_INTERFACES_FOUND:
1108 fprintf(stderr, "tethereal: There are no interfaces on which a capture can be done\n");
1113 if_info = g_list_nth_data(if_list, adapter_index - 1);
1114 if (if_info == NULL) {
1115 fprintf(stderr, "tethereal: there is no interface with that adapter index\n");
1118 capture_opts.iface = g_strdup(if_info->name);
1119 free_interface_list(if_list);
1121 capture_opts.iface = g_strdup(optarg);
1123 capture_option_specified = TRUE;
1127 case 'l': /* "Line-buffer" standard output */
1128 /* This isn't line-buffering, strictly speaking, it's just
1129 flushing the standard output after the information for
1130 each packet is printed; however, that should be good
1131 enough for all the purposes to which "-l" is put (and
1132 is probably actually better for "-V", as it does fewer
1135 See the comment in "process_packet()" for an explanation of
1136 why we do that, and why we don't just use "setvbuf()" to
1137 make the standard output line-buffered (short version: in
1138 Windows, "line-buffered" is the same as "fully-buffered",
1139 and the output buffer is only flushed when it fills up). */
1140 line_buffered = TRUE;
1142 case 'L': /* Print list of link-layer types and exit */
1144 list_link_layer_types = TRUE;
1147 capture_option_specified = TRUE;
1151 case 'n': /* No name resolution */
1152 g_resolv_flags = RESOLV_NONE;
1154 case 'N': /* Select what types of addresses/port #s to resolve */
1155 if (g_resolv_flags == RESOLV_ALL)
1156 g_resolv_flags = RESOLV_NONE;
1157 badopt = string_to_name_resolve(optarg, &g_resolv_flags);
1158 if (badopt != '\0') {
1159 fprintf(stderr, "tethereal: -N specifies unknown resolving option '%c'; valid options are 'm', 'n', and 't'\n",
1164 case 'o': /* Override preference from command line */
1165 switch (prefs_set_pref(optarg)) {
1167 case PREFS_SET_SYNTAX_ERR:
1168 fprintf(stderr, "tethereal: Invalid -o flag \"%s\"\n", optarg);
1172 case PREFS_SET_NO_SUCH_PREF:
1173 case PREFS_SET_OBSOLETE:
1174 fprintf(stderr, "tethereal: -o flag \"%s\" specifies unknown preference\n",
1180 case 'p': /* Don't capture in promiscuous mode */
1182 capture_opts.promisc_mode = FALSE;
1184 capture_option_specified = TRUE;
1188 case 'q': /* Quiet */
1191 case 'r': /* Read capture file xxx */
1192 cf_name = g_strdup(optarg);
1194 case 'R': /* Read file filter */
1197 case 's': /* Set the snapshot (capture) length */
1199 capture_opts.snaplen = get_positive_int(optarg, "snapshot length");
1201 capture_option_specified = TRUE;
1205 case 'S': /* show packets in real time */
1206 print_packet_info = TRUE;
1208 case 't': /* Time stamp type */
1209 if (strcmp(optarg, "r") == 0)
1210 set_timestamp_setting(TS_RELATIVE);
1211 else if (strcmp(optarg, "a") == 0)
1212 set_timestamp_setting(TS_ABSOLUTE);
1213 else if (strcmp(optarg, "ad") == 0)
1214 set_timestamp_setting(TS_ABSOLUTE_WITH_DATE);
1215 else if (strcmp(optarg, "d") == 0)
1216 set_timestamp_setting(TS_DELTA);
1218 fprintf(stderr, "tethereal: Invalid time stamp type \"%s\"\n",
1220 fprintf(stderr, "It must be \"r\" for relative, \"a\" for absolute,\n");
1221 fprintf(stderr, "\"ad\" for absolute with date, or \"d\" for delta.\n");
1225 case 'T': /* printing Type */
1226 if (strcmp(optarg, "text") == 0) {
1227 output_action = WRITE_TEXT;
1228 print_format = PR_FMT_TEXT;
1229 } else if (strcmp(optarg, "ps") == 0) {
1230 output_action = WRITE_TEXT;
1231 print_format = PR_FMT_PS;
1232 } else if (strcmp(optarg, "pdml") == 0) {
1233 output_action = WRITE_XML;
1235 } else if (strcmp(optarg, "psml") == 0) {
1236 output_action = WRITE_XML;
1239 fprintf(stderr, "tethereal: Invalid -T parameter.\n");
1240 fprintf(stderr, "It must be \"ps\", \"text\", \"pdml\", or \"psml\".\n");
1244 case 'v': /* Show version and exit */
1245 printf("t" PACKAGE " " VERSION
1250 comp_info_str->str, runtime_info_str->str);
1253 case 'w': /* Write to capture file xxx */
1254 save_file = g_strdup(optarg);
1256 case 'V': /* Verbose */
1259 case 'x': /* Print packet data in hex (and ASCII) */
1262 case 'y': /* Set the pcap data link type */
1264 #ifdef HAVE_PCAP_DATALINK_NAME_TO_VAL
1265 capture_opts.linktype = pcap_datalink_name_to_val(optarg);
1266 if (capture_opts.linktype == -1) {
1267 fprintf(stderr, "tethereal: The specified data link type \"%s\" isn't valid\n",
1271 #else /* HAVE_PCAP_DATALINK_NAME_TO_VAL */
1272 /* XXX - just treat it as a number */
1273 capture_opts.linktype = get_natural_int(optarg, "data link type");
1274 #endif /* HAVE_PCAP_DATALINK_NAME_TO_VAL */
1276 capture_option_specified = TRUE;
1281 for(tli=tap_list;tli;tli=tli->next){
1282 if(!strncmp(tli->cmd,optarg,strlen(tli->cmd))){
1283 (*tli->func)(optarg);
1288 fprintf(stderr,"tethereal: invalid -z argument.\n");
1289 fprintf(stderr," -z argument must be one of :\n");
1290 for(tli=tap_list;tli;tli=tli->next){
1291 fprintf(stderr," %s\n",tli->cmd);
1297 case '?': /* Bad flag - print usage message */
1303 /* If no capture filter or read filter has been specified, and there are
1304 still command-line arguments, treat them as the tokens of a capture
1305 filter (if no "-r" flag was specified) or a read filter (if a "-r"
1306 flag was specified. */
1307 if (optind < argc) {
1308 if (cf_name != NULL) {
1309 if (rfilter != NULL) {
1311 "tethereal: Read filters were specified both with \"-R\" and with additional command-line arguments\n");
1314 rfilter = get_args_as_string(argc, argv, optind);
1317 if (capture_filter_specified) {
1319 "tethereal: Capture filters were specified both with \"-f\" and with additional command-line arguments\n");
1322 capture_opts.cfilter = get_args_as_string(argc, argv, optind);
1324 capture_option_specified = TRUE;
1329 /* See if we're writing a capture file and the file is a pipe */
1331 ld.output_to_pipe = FALSE;
1333 if (save_file != NULL) {
1334 /* We're writing to a capture file. */
1335 if (strcmp(save_file, "-") == 0) {
1336 /* Write to the standard output. */
1338 save_file = g_strdup("");
1340 /* XXX - should we check whether it's a pipe? It's arguably
1341 silly to do "-w - >output_file" rather than "-w output_file",
1342 but by not checking we might be violating the Principle Of
1343 Least Astonishment. */
1344 ld.output_to_pipe = TRUE;
1349 err = test_for_fifo(save_file);
1352 case ENOENT: /* it doesn't exist, so we'll be creating it,
1353 and it won't be a FIFO */
1354 case 0: /* found it, but it's not a FIFO */
1357 case ESPIPE: /* it is a FIFO */
1358 ld.output_to_pipe = TRUE;
1361 default: /* couldn't stat it */
1363 "tethereal: Error testing whether capture file is a pipe: %s\n",
1370 /* We're not writing to a file, so we should print packet information
1371 unless "-q" was specified. */
1373 print_packet_info = TRUE;
1376 #ifndef HAVE_LIBPCAP
1377 if (capture_option_specified)
1378 fprintf(stderr, "This version of Tethereal was not built with support for capturing packets.\n");
1385 /* We don't support capture filters when reading from a capture file
1386 (the BPF compiler doesn't support all link-layer types that we
1387 support in capture files we read). */
1389 if (cf_name != NULL) {
1390 if (capture_filter_specified) {
1392 "tethereal: Only read filters, not capture filters, can be specified when reading a capture file.\n");
1399 if (output_action != WRITE_TEXT) {
1400 fprintf(stderr, "tethereal: Raw packet hex data can only be printed as text or PostScript\n");
1406 if (list_link_layer_types) {
1407 /* We're supposed to list the link-layer types for an interface;
1408 did the user also specify a capture file to be read? */
1410 /* Yes - that's bogus. */
1411 fprintf(stderr, "tethereal: You can't specify -L and a capture file to be read.\n");
1414 /* No - did they specify a ring buffer option? */
1415 if (capture_opts.ringbuffer_on) {
1416 fprintf(stderr, "tethereal: Ring buffer requested, but a capture isn't being done.\n");
1420 /* If they didn't specify a "-w" flag, but specified a maximum capture
1421 file size, tell them that this doesn't work, and exit. */
1422 if (capture_opts.has_autostop_filesize && save_file == NULL) {
1423 fprintf(stderr, "tethereal: Maximum capture file size specified, but "
1424 "capture isn't being saved to a file.\n");
1428 if (capture_opts.ringbuffer_on) {
1429 /* Ring buffer works only under certain conditions:
1430 a) ring buffer does not work if you're not saving the capture to
1432 b) ring buffer only works if you're saving in libpcap format;
1433 c) it makes no sense to enable the ring buffer if the maximum
1434 file size is set to "infinite";
1435 d) file must not be a pipe. */
1436 if (save_file == NULL) {
1437 fprintf(stderr, "tethereal: Ring buffer requested, but "
1438 "capture isn't being saved to a file.\n");
1441 if (out_file_type != WTAP_FILE_PCAP) {
1442 fprintf(stderr, "tethereal: Ring buffer requested, but "
1443 "capture isn't being saved in libpcap format.\n");
1446 if (!capture_opts.has_autostop_filesize) {
1447 fprintf(stderr, "tethereal: Ring buffer requested, but "
1448 "no maximum capture file size was specified.\n");
1451 if (ld.output_to_pipe) {
1452 fprintf(stderr, "tethereal: Ring buffer requested, but "
1453 "capture file is a pipe.\n");
1461 /* Start windows sockets */
1462 WSAStartup( MAKEWORD( 1, 1 ), &wsaData );
1465 /* Notify all registered modules that have had any of their preferences
1466 changed either from one of the preferences file or from the command
1467 line that their preferences have changed. */
1470 /* disabled protocols as per configuration file */
1471 if (gdp_path == NULL && dp_path == NULL) {
1472 set_disabled_protos_list();
1475 /* Build the column format array */
1476 col_setup(&cfile.cinfo, prefs->num_cols);
1477 for (i = 0; i < cfile.cinfo.num_cols; i++) {
1478 cfile.cinfo.col_fmt[i] = get_column_format(i);
1479 cfile.cinfo.col_title[i] = g_strdup(get_column_title(i));
1480 cfile.cinfo.fmt_matx[i] = (gboolean *) g_malloc0(sizeof(gboolean) *
1482 get_column_format_matches(cfile.cinfo.fmt_matx[i], cfile.cinfo.col_fmt[i]);
1483 cfile.cinfo.col_data[i] = NULL;
1484 if (cfile.cinfo.col_fmt[i] == COL_INFO)
1485 cfile.cinfo.col_buf[i] = (gchar *) g_malloc(sizeof(gchar) * COL_MAX_INFO_LEN);
1487 cfile.cinfo.col_buf[i] = (gchar *) g_malloc(sizeof(gchar) * COL_MAX_LEN);
1488 cfile.cinfo.col_fence[i] = 0;
1489 cfile.cinfo.col_expr[i] = (gchar *) g_malloc(sizeof(gchar) * COL_MAX_LEN);
1490 cfile.cinfo.col_expr_val[i] = (gchar *) g_malloc(sizeof(gchar) * COL_MAX_LEN);
1493 for (i = 0; i < cfile.cinfo.num_cols; i++) {
1496 for (j = 0; j < NUM_COL_FMTS; j++) {
1497 if (!cfile.cinfo.fmt_matx[i][j])
1500 if (cfile.cinfo.col_first[j] == -1)
1501 cfile.cinfo.col_first[j] = i;
1502 cfile.cinfo.col_last[j] = i;
1507 if (capture_opts.snaplen < 1)
1508 capture_opts.snaplen = WTAP_MAX_PACKET_SIZE;
1509 else if (capture_opts.snaplen < MIN_PACKET_SIZE)
1510 capture_opts.snaplen = MIN_PACKET_SIZE;
1512 /* Check the value range of the ringbuffer_num_files parameter */
1513 if (capture_opts.ringbuffer_num_files > RINGBUFFER_MAX_NUM_FILES)
1514 capture_opts.ringbuffer_num_files = RINGBUFFER_MAX_NUM_FILES;
1515 #if RINGBUFFER_MIN_NUM_FILES > 0
1516 else if (capture_opts.ringbuffer_num_files < RINGBUFFER_MIN_NUM_FILES)
1517 capture_opts.ringbuffer_num_files = RINGBUFFER_MIN_NUM_FILES;
1521 if (rfilter != NULL) {
1522 if (!dfilter_compile(rfilter, &rfcode)) {
1523 fprintf(stderr, "tethereal: %s\n", dfilter_error_msg);
1525 #ifdef HAVE_PCAP_OPEN_DEAD
1529 pc = pcap_open_dead(DLT_EN10MB, MIN_PACKET_SIZE);
1531 if (pcap_compile(pc, &fcode, rfilter, 0, 0) != -1) {
1533 " Note: That display filter code looks like a valid capture filter;\n"
1534 " maybe you mixed them up?\n");
1543 cfile.rfcode = rfcode;
1545 if (print_packet_info) {
1546 /* If we're printing as text or PostScript, we have
1547 to create a print stream. */
1548 if (output_action == WRITE_TEXT) {
1549 switch (print_format) {
1552 print_stream = print_stream_text_stdio_new(stdout);
1556 print_stream = print_stream_ps_stdio_new(stdout);
1560 g_assert_not_reached();
1565 /* We have to dissect each packet if:
1567 we're printing information about each packet;
1569 we're using a read filter on the packets;
1571 we're using any taps. */
1572 do_dissection = print_packet_info || rfcode || have_tap_listeners();
1576 * We're reading a capture file.
1581 * Immediately relinquish any set-UID or set-GID privileges we have;
1582 * we must not be allowed to read any capture files the user running
1583 * Tethereal can't open.
1589 if (cf_open(&cfile, cf_name, FALSE, &err) != CF_OK) {
1593 err = load_cap_file(&cfile, save_file, out_file_type);
1600 /* No capture file specified, so we're supposed to do a live capture
1601 (or get a list of link-layer types for a live capture device);
1602 do we have support for live captures? */
1607 fprintf(stderr, "tethereal: Could not load wpcap.dll.\n");
1612 /* Yes; did the user specify an interface to use? */
1613 if (capture_opts.iface == NULL) {
1614 /* No - is a default specified in the preferences file? */
1615 if (prefs->capture_device != NULL) {
1617 if_text = strrchr(prefs->capture_device, ' ');
1618 if (if_text == NULL) {
1619 capture_opts.iface = g_strdup(prefs->capture_device);
1621 capture_opts.iface = g_strdup(if_text + 1); /* Skip over space */
1624 /* No - pick the first one from the list of interfaces. */
1625 if_list = get_interface_list(&err, err_str);
1626 if (if_list == NULL) {
1629 case CANT_GET_INTERFACE_LIST:
1630 cant_get_if_list_errstr =
1631 cant_get_if_list_error_message(err_str);
1632 fprintf(stderr, "tethereal: %s\n", cant_get_if_list_errstr);
1633 g_free(cant_get_if_list_errstr);
1636 case NO_INTERFACES_FOUND:
1637 fprintf(stderr, "tethereal: There are no interfaces on which a capture can be done\n");
1642 if_info = if_list->data; /* first interface */
1643 capture_opts.iface = g_strdup(if_info->name);
1644 free_interface_list(if_list);
1648 if (list_link_layer_types) {
1649 /* We were asked to list the link-layer types for an interface.
1650 Get the list of link-layer types for the capture device. */
1651 lt_list = get_pcap_linktype_list(capture_opts.iface, err_str);
1652 if (lt_list == NULL) {
1653 if (err_str[0] != '\0') {
1654 fprintf(stderr, "tethereal: The list of data link types for the capture device could not be obtained (%s).\n"
1655 "Please check to make sure you have sufficient permissions, and that\n"
1656 "you have the proper interface or pipe specified.\n", err_str);
1658 fprintf(stderr, "tethereal: The capture device has no data link types.\n");
1661 fprintf(stderr, "Data link types (use option -y to set):\n");
1662 for (lt_entry = lt_list; lt_entry != NULL;
1663 lt_entry = g_list_next(lt_entry)) {
1664 data_link_info = lt_entry->data;
1665 fprintf(stderr, " %s", data_link_info->name);
1666 if (data_link_info->description != NULL)
1667 fprintf(stderr, " (%s)", data_link_info->description);
1669 fprintf(stderr, " (not supported)");
1672 free_pcap_linktype_list(lt_list);
1678 * The user didn't ask us not to print a count of packets as
1679 * they arrive, so do so.
1681 print_packet_counts = TRUE;
1684 capture(save_file, out_file_type);
1686 if (capture_opts.ringbuffer_on) {
1690 /* No - complain. */
1691 fprintf(stderr, "This version of Tethereal was not built with support for capturing packets.\n");
1696 draw_tap_listeners(TRUE);
1703 /* Do the low-level work of a capture.
1704 Returns TRUE if it succeeds, FALSE otherwise. */
1706 static condition *volatile cnd_ring_timeout = NULL; /* this must be visible in process_packet */
1709 capture(char *save_file, int out_file_type)
1713 gchar open_err_str[PCAP_ERRBUF_SIZE];
1714 gchar lookup_net_err_str[PCAP_ERRBUF_SIZE];
1715 bpf_u_int32 netnum, netmask;
1716 struct bpf_program fcode;
1717 const char *set_linktype_err_str;
1719 int volatile volatile_err = 0;
1720 int volatile inpkts = 0;
1722 char errmsg[1024+1];
1723 condition *volatile cnd_stop_capturesize = NULL;
1724 condition *volatile cnd_stop_timeout = NULL;
1727 void (*oldhandler)(int);
1728 static const char ppamsg[] = "can't find PPA for ";
1730 volatile int pipe_fd = -1;
1731 struct pcap_hdr hdr;
1732 struct pcaprec_modified_hdr rechdr;
1733 guchar pcap_data[WTAP_MAX_PACKET_SIZE];
1735 struct pcap_stat stats;
1738 dfilter_t *rfcode = NULL;
1741 /* Initialize all data structures used for dissection. */
1744 ld.linktype = WTAP_ENCAP_UNKNOWN;
1747 /* Open the network interface to capture from it.
1748 Some versions of libpcap may put warnings into the error buffer
1749 if they succeed; to tell if that's happened, we have to clear
1750 the error buffer, and check if it's still a null string. */
1751 open_err_str[0] = '\0';
1752 ld.pch = pcap_open_live(capture_opts.iface, capture_opts.snaplen,
1753 capture_opts.promisc_mode, 1000, open_err_str);
1755 if (ld.pch != NULL) {
1756 /* setting the data link type only works on real interfaces */
1757 if (capture_opts.linktype != -1) {
1758 set_linktype_err_str = set_pcap_linktype(ld.pch, capture_opts.iface,
1759 capture_opts.linktype);
1760 if (set_linktype_err_str != NULL) {
1761 snprintf(errmsg, sizeof errmsg, "Unable to set data link type (%s).",
1762 set_linktype_err_str);
1767 /* We couldn't open "cfile.iface" as a network device. */
1769 /* On Windows, we don't support capturing on pipes, so we give up. */
1771 /* On Win32 OSes, the capture devices are probably available to all
1772 users; don't warn about permissions problems.
1774 Do, however, warn that WAN devices aren't supported. */
1775 snprintf(errmsg, sizeof errmsg,
1776 "The capture session could not be initiated (%s).\n"
1777 "Please check that you have the proper interface specified.\n"
1779 "Note that the WinPcap 2.x version of the driver Ethereal uses for packet\n"
1780 "capture on Windows doesn't support capturing on PPP/WAN interfaces in\n"
1781 "Windows NT/2000/XP/2003 Server, and that the WinPcap 3.0 and later versions\n"
1782 "don't support capturing on PPP/WAN interfaces at all.\n",
1786 /* try to open cfile.iface as a pipe */
1787 pipe_fd = pipe_open_live(capture_opts.iface, &hdr, &ld, errmsg,
1790 if (pipe_fd == -1) {
1792 if (ld.pipe_err == PIPNEXIST) {
1793 /* Pipe doesn't exist, so output message for interface */
1795 /* If we got a "can't find PPA for XXX" message, warn the user (who
1796 is running Tethereal on HP-UX) that they don't have a version
1797 of libpcap that properly handles HP-UX (libpcap 0.6.x and later
1798 versions, which properly handle HP-UX, say "can't find /dev/dlpi
1799 PPA for XXX" rather than "can't find PPA for XXX"). */
1800 if (strncmp(open_err_str, ppamsg, sizeof ppamsg - 1) == 0)
1803 "You are running Tethereal with a version of the libpcap library\n"
1804 "that doesn't handle HP-UX network devices well; this means that\n"
1805 "Tethereal may not be able to capture packets.\n"
1807 "To fix this, you should install libpcap 0.6.2, or a later version\n"
1808 "of libpcap, rather than libpcap 0.4 or 0.5.x. It is available in\n"
1809 "packaged binary form from the Software Porting And Archive Centre\n"
1810 "for HP-UX; the Centre is at http://hpux.connect.org.uk/ - the page\n"
1811 "at the URL lists a number of mirror sites.";
1814 snprintf(errmsg, sizeof errmsg,
1815 "The capture session could not be initiated (%s).\n"
1816 "Please check to make sure you have sufficient permissions, and that\n"
1817 "you have the proper interface or pipe specified.%s", open_err_str,
1821 * Else pipe (or file) does exist and pipe_open_live() has
1826 /* pipe_open_live() succeeded; don't want
1827 error message from pcap_open_live() */
1828 open_err_str[0] = '\0';
1834 * We've opened the capture device, so, if we're set-UID or set-GID,
1835 * relinquish those privileges.
1837 * XXX - if we have saved set-user-ID support, we should give up those
1838 * privileges immediately, and then reclaim them long enough to get
1839 * a list of network interfaces and to open one, and then give them
1840 * up again, so that stuff we do while processing the argument list,
1841 * reading the user's preferences, etc. is done as the real user and
1842 * group, not the effective user and group.
1848 if (capture_opts.cfilter && !ld.from_pipe) {
1849 /* A capture filter was specified; set it up. */
1850 if (pcap_lookupnet(capture_opts.iface, &netnum, &netmask, lookup_net_err_str) < 0) {
1852 * Well, we can't get the netmask for this interface; it's used
1853 * only for filters that check for broadcast IP addresses, so
1854 * we just warn the user, and punt and use 0.
1857 "Warning: Couldn't obtain netmask info (%s).\n", lookup_net_err_str);
1860 if (pcap_compile(ld.pch, &fcode, capture_opts.cfilter, 1, netmask) < 0) {
1861 if (dfilter_compile(capture_opts.cfilter, &rfcode)) {
1862 snprintf(errmsg, sizeof errmsg,
1863 "Unable to parse capture filter string (%s).\n"
1864 " Interestingly enough, this looks like a valid display filter\n"
1865 " Are you sure you didn't mix them up?",
1866 pcap_geterr(ld.pch));
1868 snprintf(errmsg, sizeof errmsg,
1869 "Unable to parse capture filter string (%s).",
1870 pcap_geterr(ld.pch));
1874 if (pcap_setfilter(ld.pch, &fcode) < 0) {
1875 snprintf(errmsg, sizeof errmsg, "Can't install filter (%s).",
1876 pcap_geterr(ld.pch));
1881 /* Set up to write to the capture file. */
1884 pcap_encap = hdr.network;
1885 file_snaplen = hdr.snaplen;
1889 pcap_encap = get_pcap_linktype(ld.pch, capture_opts.iface);
1890 file_snaplen = pcap_snapshot(ld.pch);
1892 ld.linktype = wtap_pcap_encap_to_wtap_encap(pcap_encap);
1893 if (save_file != NULL) {
1894 /* Set up to write to the capture file. */
1895 if (ld.linktype == WTAP_ENCAP_UNKNOWN) {
1896 strcpy(errmsg, "The network you're capturing from is of a type"
1897 " that Tethereal doesn't support.");
1900 ld.save_file = save_file;
1901 if (capture_opts.ringbuffer_on) {
1902 save_file_fd = ringbuf_init(save_file,
1903 capture_opts.ringbuffer_num_files);
1904 if (save_file_fd != -1) {
1905 ld.pdh = ringbuf_init_wtap_dump_fdopen(out_file_type, ld.linktype,
1906 file_snaplen, &err);
1908 err = errno; /* "ringbuf_init()" failed */
1912 ld.pdh = wtap_dump_open(save_file, out_file_type,
1913 ld.linktype, file_snaplen, &err);
1916 if (ld.pdh == NULL) {
1917 snprintf(errmsg, sizeof errmsg,
1918 cf_open_error_message(err, NULL, TRUE, out_file_type),
1919 *save_file == '\0' ? "stdout" : save_file);
1924 /* Does "open_err_str" contain a non-empty string? If so, "pcap_open_live()"
1925 returned a warning; print it, but keep capturing. */
1926 if (open_err_str[0] != '\0')
1927 fprintf(stderr, "tethereal: WARNING: %s.\n", open_err_str);
1930 /* Catch a CTRL+C event and, if we get it, clean up and exit. */
1931 SetConsoleCtrlHandler(capture_cleanup, TRUE);
1933 /* Catch SIGINT and SIGTERM and, if we get either of them, clean up
1935 XXX - deal with signal semantics on various UNIX platforms. Or just
1936 use "sigaction()" and be done with it? */
1937 signal(SIGTERM, capture_cleanup);
1938 signal(SIGINT, capture_cleanup);
1939 if ((oldhandler = signal(SIGHUP, capture_cleanup)) != SIG_DFL)
1940 signal(SIGHUP, oldhandler);
1943 /* Catch SIGINFO and, if we get it and we're capturing to a file in
1944 quiet mode, report the number of packets we've captured. */
1945 signal(SIGINFO, report_counts_siginfo);
1946 #endif /* SIGINFO */
1949 /* Let the user know what interface was chosen. */
1950 descr = get_interface_descriptive_name(capture_opts.iface);
1951 fprintf(stderr, "Capturing on %s\n", descr);
1954 /* initialize capture stop conditions */
1955 init_capture_stop_conditions();
1956 /* create stop conditions */
1957 if (capture_opts.has_autostop_filesize)
1958 cnd_stop_capturesize = cnd_new((const char*)CND_CLASS_CAPTURESIZE,
1959 (long)capture_opts.autostop_filesize * 1000);
1960 if (capture_opts.has_autostop_duration)
1961 cnd_stop_timeout = cnd_new((const char*)CND_CLASS_TIMEOUT,
1962 (gint32)capture_opts.autostop_duration);
1964 if (capture_opts.ringbuffer_on && capture_opts.has_ring_duration)
1965 cnd_ring_timeout = cnd_new(CND_CLASS_TIMEOUT,
1966 capture_opts.ringbuffer_duration);
1968 if (!setjmp(ld.stopenv)) {
1970 ld.packet_count = 0;
1974 /* We need to be careful with automatic variables defined in the
1975 outer scope which are changed inside the loop. Most compilers
1976 don't try to roll them back to their original values after the
1977 longjmp which causes the loop to finish, but all that the
1978 standards say is that their values are indeterminate. If we
1979 don't want them to be rolled back, we should define them with the
1980 volatile attribute (paraphrasing W. Richard Stevens, Advanced
1981 Programming in the UNIX Environment, p. 178).
1983 The "err" variable causes a particular problem. If we give it
1984 the volatile attribute, then when we pass a reference to it (as
1985 in "&err") to a function, GCC warns: "passing arg <n> of
1986 <function> discards qualifiers from pointer target type".
1987 Therefore within the loop and just beyond we don't use "err".
1988 Within the loop we define "loop_err", and assign its value to
1989 "volatile_err", which is in the outer scope and is checked when
1992 We also define "packet_count_prev" here to keep things tidy,
1993 since it's used only inside the loop. If it were defined in the
1994 outer scope, GCC would give a warning (unnecessary in this case)
1995 that it might be clobbered, and we'd need to give it the volatile
1996 attribute to suppress the warning. */
1999 int packet_count_prev = 0;
2001 if (cnd_stop_capturesize == NULL && cnd_stop_timeout == NULL) {
2002 /* We're not stopping at a particular capture file size, and we're
2003 not stopping after some particular amount of time has expired,
2004 so either we have no stop condition or the only stop condition
2005 is a maximum packet count.
2007 If there's no maximum packet count, pass it -1, meaning "until
2008 you run out of packets in the bufferful you read". Otherwise,
2009 pass it the number of packets we have left to capture.
2011 We don't call "pcap_loop()" as, if we're saving to a file that's
2012 a FIFO, we want to flush the FIFO after we're done processing
2013 this libpcap bufferful of packets, so that the program
2014 reading the FIFO sees the packets immediately and doesn't get
2015 any partial packet, forcing it to block in the middle of reading
2017 if (capture_opts.autostop_count == 0)
2020 if (ld.packet_count >= capture_opts.autostop_count) {
2021 /* XXX do we need this test here? */
2022 /* It appears there's nothing more to capture. */
2025 pcap_cnt = capture_opts.autostop_count - ld.packet_count;
2028 /* We need to check the capture file size or the timeout after
2034 inpkts = pipe_dispatch(pipe_fd, &ld, &hdr, &rechdr, pcap_data,
2035 errmsg, sizeof errmsg);
2038 inpkts = pcap_dispatch(ld.pch, pcap_cnt, capture_pcap_cb, (guchar *) &ld);
2040 /* Error from "pcap_dispatch()", or error or "no more packets" from
2041 "pipe_dispatch(). */
2043 } else if (cnd_stop_timeout != NULL && cnd_eval(cnd_stop_timeout)) {
2044 /* The specified capture time has elapsed; stop the capture. */
2046 } else if (inpkts > 0) {
2047 if (capture_opts.autostop_count != 0 &&
2048 ld.packet_count >= capture_opts.autostop_count) {
2049 /* The specified number of packets have been captured and have
2050 passed both any capture filter in effect and any read filter
2053 } else if (cnd_stop_capturesize != NULL &&
2054 cnd_eval(cnd_stop_capturesize,
2055 (guint32)wtap_get_bytes_dumped(ld.pdh))) {
2056 /* We're saving the capture to a file, and the capture file reached
2057 its maximum size. */
2058 if (capture_opts.ringbuffer_on) {
2059 /* Switch to the next ringbuffer file */
2060 if (ringbuf_switch_file(&ld.pdh, &save_file, &save_file_fd, &loop_err)) {
2061 /* File switch succeeded: reset the condition */
2062 cnd_reset(cnd_stop_capturesize);
2063 if (cnd_ring_timeout) {
2064 cnd_reset(cnd_ring_timeout);
2067 /* File switch failed: stop here */
2068 volatile_err = loop_err;
2072 /* No ringbuffer - just stop. */
2076 if (ld.output_to_pipe) {
2077 if (ld.packet_count > packet_count_prev) {
2078 if (fflush(wtap_dump_file(ld.pdh))) {
2079 volatile_err = errno;
2082 packet_count_prev = ld.packet_count;
2086 } /* while (ld.go) */
2088 /* delete stop conditions */
2089 if (cnd_stop_capturesize != NULL)
2090 cnd_delete(cnd_stop_capturesize);
2091 if (cnd_stop_timeout != NULL)
2092 cnd_delete(cnd_stop_timeout);
2093 if (cnd_ring_timeout != NULL)
2094 cnd_delete(cnd_ring_timeout);
2096 if (print_packet_counts) {
2097 /* We're printing packet counts to stderr.
2098 Send a newline so that we move to the line after the packet count. */
2099 fprintf(stderr, "\n");
2102 /* If we got an error while capturing, report it. */
2106 if (ld.pipe_err == PIPERR) {
2107 fprintf(stderr, "tethereal: Error while capturing packets: %s\n",
2113 fprintf(stderr, "tethereal: Error while capturing packets: %s\n",
2114 pcap_geterr(ld.pch));
2118 if (volatile_err == 0)
2121 show_capture_file_io_error(save_file, volatile_err, FALSE);
2125 if (save_file != NULL) {
2126 /* We're saving to a file or files; close all files. */
2127 if (capture_opts.ringbuffer_on) {
2128 dump_ok = ringbuf_wtap_dump_close(&save_file, &err);
2130 dump_ok = wtap_dump_close(ld.pdh, &err);
2132 /* If we've displayed a message about a write error, there's no point
2133 in displaying another message about an error on close. */
2134 if (!dump_ok && !write_err)
2135 show_capture_file_io_error(save_file, err, TRUE);
2139 if (ld.from_pipe && pipe_fd >= 0)
2144 /* Get the capture statistics, and, if any packets were dropped, report
2146 if (pcap_stats(ld.pch, &stats) >= 0) {
2147 if (stats.ps_drop != 0) {
2148 fprintf(stderr, "%u packets dropped\n", stats.ps_drop);
2151 fprintf(stderr, "tethereal: Can't get packet-drop statistics: %s\n",
2152 pcap_geterr(ld.pch));
2157 /* Report the number of captured packets if not reported during capture
2158 and we are saving to a file. */
2164 if (capture_opts.ringbuffer_on) {
2165 ringbuf_error_cleanup();
2169 fprintf(stderr, "tethereal: %s\n", errmsg);
2185 capture_pcap_cb(guchar *user, const struct pcap_pkthdr *phdr,
2188 struct wtap_pkthdr whdr;
2189 union wtap_pseudo_header pseudo_header;
2190 loop_data *ldat = (loop_data *) user;
2195 /* Convert from libpcap to Wiretap format.
2196 If that fails, ignore the packet (wtap_process_pcap_packet has
2197 written an error message). */
2198 pd = wtap_process_pcap_packet(ldat->linktype, phdr, pd, &pseudo_header,
2205 * Prevent a SIGINFO handler from writing to stdout while we're
2206 * doing so; instead, have it just set a flag telling us to print
2207 * that information when we're done.
2210 #endif /* SIGINFO */
2212 /* The current packet may have arrived after a very long silence,
2213 * way past the time to switch files. In order not to have
2214 * the first packet of a new series of events as the last
2215 * [or only] packet in the file, switch before writing!
2217 if (cnd_ring_timeout != NULL && cnd_eval(cnd_ring_timeout)) {
2218 /* time elapsed for this ring file, switch to the next */
2219 if (ringbuf_switch_file(&ldat->pdh, &ldat->save_file, &save_file_fd, &loop_err)) {
2220 /* File switch succeeded: reset the condition */
2221 cnd_reset(cnd_ring_timeout);
2223 /* File switch failed: stop here */
2224 /* XXX - we should do something with "loop_err" */
2229 if (!process_packet(&cfile, ldat->pdh, 0, &whdr, &pseudo_header, pd, &err)) {
2230 /* Error writing to a capture file */
2231 if (print_packet_counts) {
2232 /* We're printing counts of packets captured; move to the line after
2234 fprintf(stderr, "\n");
2236 show_capture_file_io_error(ldat->save_file, err, FALSE);
2237 pcap_close(ldat->pch);
2238 wtap_dump_close(ldat->pdh, &err);
2244 * Allow SIGINFO handlers to write.
2249 * If a SIGINFO handler asked us to write out capture counts, do so.
2253 #endif /* SIGINFO */
2258 capture_cleanup(DWORD ctrltype _U_)
2260 /* CTRL_C_EVENT is sort of like SIGINT, CTRL_BREAK_EVENT is unique to
2261 Windows, CTRL_CLOSE_EVENT is sort of like SIGHUP, CTRL_LOGOFF_EVENT
2262 is also sort of like SIGHUP, and CTRL_SHUTDOWN_EVENT is sort of
2263 like SIGTERM at least when the machine's shutting down.
2265 For now, we handle them all as indications that we should clean up
2266 and quit, just as we handle SIGINT, SIGHUP, and SIGTERM in that
2269 However, as handlers run in a new thread, we can't just longjmp
2270 out; we have to set "ld.go" to FALSE, and must return TRUE so that
2271 no other handler - such as one that would terminate the process -
2274 XXX - for some reason, typing ^C to Tethereal, if you run this in
2275 a Cygwin console window in at least some versions of Cygwin,
2276 causes Tethereal to terminate immediately; this routine gets
2277 called, but the main loop doesn't get a chance to run and
2278 exit cleanly, at least if this is compiled with Microsoft Visual
2279 C++ (i.e., it's a property of the Cygwin console window or Bash;
2280 it happens if Tethereal is not built with Cygwin - for all I know,
2281 building it with Cygwin may make the problem go away). */
2287 capture_cleanup(int signum _U_)
2289 /* Longjmp back to the starting point; "pcap_dispatch()", on many
2290 UNIX platforms, just keeps looping if it gets EINTR, so if we set
2291 "ld.go" to FALSE and return, we won't break out of it and quit
2293 longjmp(ld.stopenv, 1);
2301 /* XXX - if we use sigaction, this doesn't have to be done.
2302 (Yes, this isn't necessary on BSD, but just in case a system
2303 where "signal()" has AT&T semantics adopts SIGINFO....) */
2304 signal(SIGINFO, report_counts_siginfo);
2305 #endif /* SIGINFO */
2307 if (!print_packet_counts) {
2308 /* Report the count only if we aren't printing a packet count
2309 as packets arrive. */
2310 fprintf(stderr, "%u packets captured\n", ld.packet_count);
2313 infoprint = FALSE; /* we just reported it */
2314 #endif /* SIGINFO */
2319 report_counts_siginfo(int signum _U_)
2321 int sav_errno = errno;
2322 /* If we've been told to delay printing, just set a flag asking
2323 that we print counts (if we're supposed to), otherwise print
2324 the count of packets captured (if we're supposed to). */
2331 #endif /* SIGINFO */
2332 #endif /* HAVE_LIBPCAP */
2335 load_cap_file(capture_file *cf, char *save_file, int out_file_type)
2338 int snapshot_length;
2344 linktype = wtap_file_encap(cf->wth);
2345 if (save_file != NULL) {
2346 /* Set up to write to the capture file. */
2347 snapshot_length = wtap_snapshot_length(cf->wth);
2348 if (snapshot_length == 0) {
2349 /* Snapshot length of input file not known. */
2350 snapshot_length = WTAP_MAX_PACKET_SIZE;
2352 pdh = wtap_dump_open(save_file, out_file_type,
2353 linktype, snapshot_length, &err);
2356 /* We couldn't set up to write to the capture file. */
2359 case WTAP_ERR_UNSUPPORTED_FILE_TYPE:
2361 "tethereal: Capture files can't be written in that format.\n");
2364 case WTAP_ERR_UNSUPPORTED_ENCAP:
2365 case WTAP_ERR_ENCAP_PER_PACKET_UNSUPPORTED:
2367 "tethereal: The capture file being read can't be written in "
2371 case WTAP_ERR_CANT_OPEN:
2373 "tethereal: The file \"%s\" couldn't be created for some "
2374 "unknown reason.\n",
2375 *save_file == '\0' ? "stdout" : save_file);
2378 case WTAP_ERR_SHORT_WRITE:
2380 "tethereal: A full header couldn't be written to the file \"%s\".\n",
2381 *save_file == '\0' ? "stdout" : save_file);
2386 "tethereal: The file \"%s\" could not be created: %s\n.",
2387 *save_file == '\0' ? "stdout" : save_file,
2388 wtap_strerror(err));
2394 if (print_packet_info) {
2395 if (!write_preamble(cf)) {
2397 show_print_file_io_error(err);
2403 while (wtap_read(cf->wth, &err, &err_info, &data_offset)) {
2404 if (!process_packet(cf, pdh, data_offset, wtap_phdr(cf->wth),
2405 wtap_pseudoheader(cf->wth), wtap_buf_ptr(cf->wth),
2407 /* Error writing to a capture file */
2408 show_capture_file_io_error(save_file, err, FALSE);
2409 wtap_dump_close(pdh, &err);
2414 /* Print a message noting that the read failed somewhere along the line. */
2417 case WTAP_ERR_UNSUPPORTED_ENCAP:
2419 "tethereal: \"%s\" has a packet with a network type that Tethereal doesn't support.\n(%s)\n",
2420 cf->filename, err_info);
2423 case WTAP_ERR_CANT_READ:
2425 "tethereal: An attempt to read from \"%s\" failed for some unknown reason.\n",
2429 case WTAP_ERR_SHORT_READ:
2431 "tethereal: \"%s\" appears to have been cut short in the middle of a packet.\n",
2435 case WTAP_ERR_BAD_RECORD:
2437 "tethereal: \"%s\" appears to be damaged or corrupt.\n(%s)\n",
2438 cf->filename, err_info);
2443 "tethereal: An error occurred while reading \"%s\": %s.\n",
2444 cf->filename, wtap_strerror(err));
2447 if (save_file != NULL) {
2448 /* Now close the capture file. */
2449 if (!wtap_dump_close(pdh, &err))
2450 show_capture_file_io_error(save_file, err, TRUE);
2453 if (save_file != NULL) {
2454 /* Now close the capture file. */
2455 if (!wtap_dump_close(pdh, &err))
2456 show_capture_file_io_error(save_file, err, TRUE);
2458 if (print_packet_info) {
2459 if (!write_finale()) {
2461 show_print_file_io_error(err);
2468 wtap_close(cf->wth);
2475 fill_in_fdata(frame_data *fdata, capture_file *cf,
2476 const struct wtap_pkthdr *phdr, long offset)
2481 fdata->num = cf->count;
2482 fdata->pkt_len = phdr->len;
2483 cum_bytes += phdr->len;
2484 fdata->cum_bytes = cum_bytes;
2485 fdata->cap_len = phdr->caplen;
2486 fdata->file_off = offset;
2487 fdata->lnk_t = phdr->pkt_encap;
2488 fdata->abs_secs = phdr->ts.tv_sec;
2489 fdata->abs_usecs = phdr->ts.tv_usec;
2490 fdata->flags.passed_dfilter = 0;
2491 fdata->flags.encoding = CHAR_ASCII;
2492 fdata->flags.visited = 0;
2493 fdata->flags.marked = 0;
2494 fdata->flags.ref_time = 0;
2496 /* If we don't have the time stamp of the first packet in the
2497 capture, it's because this is the first packet. Save the time
2498 stamp of this packet as the time stamp of the first packet. */
2499 if (!firstsec && !firstusec) {
2500 firstsec = fdata->abs_secs;
2501 firstusec = fdata->abs_usecs;
2504 /* If we don't have the time stamp of the previous displayed packet,
2505 it's because this is the first displayed packet. Save the time
2506 stamp of this packet as the time stamp of the previous displayed
2508 if (!prevsec && !prevusec) {
2509 prevsec = fdata->abs_secs;
2510 prevusec = fdata->abs_usecs;
2513 /* Get the time elapsed between the first packet and this packet. */
2514 compute_timestamp_diff(&fdata->rel_secs, &fdata->rel_usecs,
2515 fdata->abs_secs, fdata->abs_usecs, firstsec, firstusec);
2517 /* If it's greater than the current elapsed time, set the elapsed time
2518 to it (we check for "greater than" so as not to be confused by
2519 time moving backwards). */
2520 if ((gint32)cf->esec < fdata->rel_secs
2521 || ((gint32)cf->esec == fdata->rel_secs && (gint32)cf->eusec < fdata->rel_usecs)) {
2522 cf->esec = fdata->rel_secs;
2523 cf->eusec = fdata->rel_usecs;
2526 /* Get the time elapsed between the previous displayed packet and
2528 compute_timestamp_diff(&fdata->del_secs, &fdata->del_usecs,
2529 fdata->abs_secs, fdata->abs_usecs, prevsec, prevusec);
2530 prevsec = fdata->abs_secs;
2531 prevusec = fdata->abs_usecs;
2534 /* Free up all data attached to a "frame_data" structure. */
2536 clear_fdata(frame_data *fdata)
2539 g_slist_free(fdata->pfd);
2543 process_packet(capture_file *cf, wtap_dumper *pdh, long offset,
2544 const struct wtap_pkthdr *whdr,
2545 union wtap_pseudo_header *pseudo_header, const guchar *pd,
2549 gboolean create_proto_tree;
2550 epan_dissect_t *edt;
2553 /* Count this packet. */
2556 /* If we're going to print packet information, or we're going to
2557 run a read filter, or we're going to process taps, set up to
2558 do a dissection and do so. */
2559 if (do_dissection) {
2560 fill_in_fdata(&fdata, cf, whdr, offset);
2562 if (print_packet_info) {
2563 /* Grab any resolved addresses */
2565 if (g_resolv_flags) {
2566 host_name_lookup_process(NULL);
2571 if (cf->rfcode || verbose || num_tap_filters!=0)
2572 create_proto_tree = TRUE;
2574 create_proto_tree = FALSE;
2575 /* The protocol tree will be "visible", i.e., printed, only if we're
2576 printing packet details, which is true if we're printing stuff
2577 ("print_packet_info" is true) and we're in verbose mode ("verbose"
2579 edt = epan_dissect_new(create_proto_tree, print_packet_info && verbose);
2581 /* If we're running a read filter, prime the epan_dissect_t with that
2584 epan_dissect_prime_dfilter(edt, cf->rfcode);
2586 tap_queue_init(edt);
2588 /* We only need the columns if we're printing packet info but we're
2589 *not* verbose; in verbose mode, we print the protocol tree, not
2590 the protocol summary. */
2591 epan_dissect_run(edt, pseudo_header, pd, &fdata,
2592 (print_packet_info && !verbose) ? &cf->cinfo : NULL);
2594 tap_push_tapped_queue(edt);
2596 /* Run the read filter if we have one. */
2598 passed = dfilter_apply_edt(cf->rfcode, edt);
2602 /* We're not running a display filter and we're not printing any
2603 packet information, so we don't need to do a dissection, and all
2604 packets are processed. */
2610 /* Count this packet. */
2615 /* Process this packet. */
2617 /* We're writing to a capture file; write this packet. */
2618 if (!wtap_dump(pdh, whdr, pseudo_header, pd, err))
2621 if (print_packet_counts) {
2622 /* We're printing packet counts. */
2623 if (ld.packet_count != 0) {
2624 fprintf(stderr, "\r%u ", ld.packet_count);
2625 /* stderr could be line buffered */
2631 if (print_packet_info) {
2632 /* We're printing packet information; print the information for
2634 print_packet(cf, edt);
2636 /* The ANSI C standard does not appear to *require* that a line-buffered
2637 stream be flushed to the host environment whenever a newline is
2638 written, it just says that, on such a stream, characters "are
2639 intended to be transmitted to or from the host environment as a
2640 block when a new-line character is encountered".
2642 The Visual C++ 6.0 C implementation doesn't do what is intended;
2643 even if you set a stream to be line-buffered, it still doesn't
2644 flush the buffer at the end of every line.
2646 So, if the "-l" flag was specified, we flush the standard output
2647 at the end of a packet. This will do the right thing if we're
2648 printing packet summary lines, and, as we print the entire protocol
2649 tree for a single packet without waiting for anything to happen,
2650 it should be as good as line-buffered mode if we're printing
2651 protocol trees. (The whole reason for the "-l" flag in either
2652 tcpdump or Tethereal is to allow the output of a live capture to
2653 be piped to a program or script and to have that script see the
2654 information for the packet as soon as it's printed, rather than
2655 having to wait until a standard I/O buffer fills up. */
2659 if (ferror(stdout)) {
2660 show_print_file_io_error(errno);
2666 if (do_dissection) {
2667 epan_dissect_free(edt);
2668 clear_fdata(&fdata);
2674 show_capture_file_io_error(const char *fname, int err, gboolean is_close)
2683 "tethereal: Not all the packets could be written to \"%s\" because there is "
2684 "no space left on the file system.\n",
2691 "tethereal: Not all the packets could be written to \"%s\" because you are "
2692 "too close to, or over your disk quota.\n",
2697 case WTAP_ERR_CANT_CLOSE:
2699 "tethereal: \"%s\" couldn't be closed for some unknown reason.\n",
2703 case WTAP_ERR_SHORT_WRITE:
2705 "tethereal: Not all the packets could be written to \"%s\".\n",
2712 "tethereal: \"%s\" could not be closed: %s.\n",
2713 fname, wtap_strerror(err));
2716 "tethereal: An error occurred while writing to \"%s\": %s.\n",
2717 fname, wtap_strerror(err));
2724 write_preamble(capture_file *cf)
2726 switch (output_action) {
2729 return print_preamble(print_stream, cf->filename);
2734 write_pdml_preamble(stdout);
2736 write_psml_preamble(stdout);
2737 return !ferror(stdout);
2740 g_assert_not_reached();
2746 get_line_buf(size_t len)
2748 static char *line_bufp = NULL;
2749 static size_t line_buf_len = 256;
2750 size_t new_line_buf_len;
2752 for (new_line_buf_len = line_buf_len; len > new_line_buf_len;
2753 new_line_buf_len *= 2)
2755 if (line_bufp == NULL) {
2756 line_buf_len = new_line_buf_len;
2757 line_bufp = g_malloc(line_buf_len + 1);
2759 if (new_line_buf_len > line_buf_len) {
2760 line_buf_len = new_line_buf_len;
2761 line_bufp = g_realloc(line_bufp, line_buf_len + 1);
2768 print_columns(capture_file *cf)
2775 line_bufp = get_line_buf(256);
2778 for (i = 0; i < cf->cinfo.num_cols; i++) {
2779 switch (cf->cinfo.col_fmt[i]) {
2783 * Don't print this if we're doing a live capture from a network
2784 * interface - if we're doing a live capture, you won't be
2785 * able to look at the capture in the future (it's not being
2786 * saved anywhere), so the frame numbers are unlikely to be
2789 * (XXX - it might be nice to be able to save and print at
2790 * the same time, sort of like an "Update list of packets
2791 * in real time" capture in Ethereal.)
2793 if (capture_opts.iface != NULL)
2796 column_len = strlen(cf->cinfo.col_data[i]);
2799 line_bufp = get_line_buf(buf_offset + column_len);
2800 sprintf(line_bufp + buf_offset, "%3s", cf->cinfo.col_data[i]);
2806 case COL_ABS_DATE_TIME: /* XXX - wider */
2807 column_len = strlen(cf->cinfo.col_data[i]);
2808 if (column_len < 10)
2810 line_bufp = get_line_buf(buf_offset + column_len);
2811 sprintf(line_bufp + buf_offset, "%10s", cf->cinfo.col_data[i]);
2817 case COL_DEF_DL_SRC:
2818 case COL_RES_DL_SRC:
2819 case COL_UNRES_DL_SRC:
2820 case COL_DEF_NET_SRC:
2821 case COL_RES_NET_SRC:
2822 case COL_UNRES_NET_SRC:
2823 column_len = strlen(cf->cinfo.col_data[i]);
2824 if (column_len < 12)
2826 line_bufp = get_line_buf(buf_offset + column_len);
2827 sprintf(line_bufp + buf_offset, "%12s", cf->cinfo.col_data[i]);
2833 case COL_DEF_DL_DST:
2834 case COL_RES_DL_DST:
2835 case COL_UNRES_DL_DST:
2836 case COL_DEF_NET_DST:
2837 case COL_RES_NET_DST:
2838 case COL_UNRES_NET_DST:
2839 column_len = strlen(cf->cinfo.col_data[i]);
2840 if (column_len < 12)
2842 line_bufp = get_line_buf(buf_offset + column_len);
2843 sprintf(line_bufp + buf_offset, "%-12s", cf->cinfo.col_data[i]);
2847 column_len = strlen(cf->cinfo.col_data[i]);
2848 line_bufp = get_line_buf(buf_offset + column_len);
2849 strcat(line_bufp + buf_offset, cf->cinfo.col_data[i]);
2852 buf_offset += column_len;
2853 if (i != cf->cinfo.num_cols - 1) {
2855 * This isn't the last column, so we need to print a
2856 * separator between this column and the next.
2858 * If we printed a network source and are printing a
2859 * network destination of the same type next, separate
2860 * them with "->"; if we printed a network destination
2861 * and are printing a network source of the same type
2862 * next, separate them with "<-"; otherwise separate them
2865 * We add enough space to the buffer for " <- " or " -> ",
2866 * even if we're only adding " ".
2868 line_bufp = get_line_buf(buf_offset + 4);
2869 switch (cf->cinfo.col_fmt[i]) {
2874 switch (cf->cinfo.col_fmt[i + 1]) {
2879 strcat(line_bufp + buf_offset, " -> ");
2884 strcat(line_bufp + buf_offset, " ");
2890 case COL_DEF_DL_SRC:
2891 case COL_RES_DL_SRC:
2892 case COL_UNRES_DL_SRC:
2893 switch (cf->cinfo.col_fmt[i + 1]) {
2895 case COL_DEF_DL_DST:
2896 case COL_RES_DL_DST:
2897 case COL_UNRES_DL_DST:
2898 strcat(line_bufp + buf_offset, " -> ");
2903 strcat(line_bufp + buf_offset, " ");
2909 case COL_DEF_NET_SRC:
2910 case COL_RES_NET_SRC:
2911 case COL_UNRES_NET_SRC:
2912 switch (cf->cinfo.col_fmt[i + 1]) {
2914 case COL_DEF_NET_DST:
2915 case COL_RES_NET_DST:
2916 case COL_UNRES_NET_DST:
2917 strcat(line_bufp + buf_offset, " -> ");
2922 strcat(line_bufp + buf_offset, " ");
2931 switch (cf->cinfo.col_fmt[i + 1]) {
2936 strcat(line_bufp + buf_offset, " <- ");
2941 strcat(line_bufp + buf_offset, " ");
2947 case COL_DEF_DL_DST:
2948 case COL_RES_DL_DST:
2949 case COL_UNRES_DL_DST:
2950 switch (cf->cinfo.col_fmt[i + 1]) {
2952 case COL_DEF_DL_SRC:
2953 case COL_RES_DL_SRC:
2954 case COL_UNRES_DL_SRC:
2955 strcat(line_bufp + buf_offset, " <- ");
2960 strcat(line_bufp + buf_offset, " ");
2966 case COL_DEF_NET_DST:
2967 case COL_RES_NET_DST:
2968 case COL_UNRES_NET_DST:
2969 switch (cf->cinfo.col_fmt[i + 1]) {
2971 case COL_DEF_NET_SRC:
2972 case COL_RES_NET_SRC:
2973 case COL_UNRES_NET_SRC:
2974 strcat(line_bufp + buf_offset, " <- ");
2979 strcat(line_bufp + buf_offset, " ");
2986 strcat(line_bufp + buf_offset, " ");
2992 return print_line(print_stream, 0, line_bufp);
2996 print_packet(capture_file *cf, epan_dissect_t *edt)
2998 print_args_t print_args;
3001 /* Print the information in the protocol tree. */
3002 switch (output_action) {
3005 print_args.to_file = TRUE;
3006 print_args.format = print_format;
3007 print_args.print_summary = !verbose;
3008 print_args.print_hex = verbose && print_hex;
3009 print_args.print_formfeed = FALSE;
3010 print_args.print_dissections = verbose ? print_dissections_expanded : print_dissections_none;
3012 /* init the packet range */
3013 packet_range_init(&print_args.range);
3015 if (!proto_tree_print(&print_args, edt, print_stream))
3018 /* "print_hex_data()" will put out a leading blank line, as well
3019 as a trailing one; print one here, to separate the packets,
3020 only if "print_hex_data()" won't be called. */
3021 if (!print_line(print_stream, 0, ""))
3027 proto_tree_write_pdml(edt, stdout);
3029 return !ferror(stdout);
3032 /* Just fill in the columns. */
3033 epan_dissect_fill_in_columns(edt);
3035 /* Now print them. */
3036 switch (output_action) {
3039 if (!print_columns(cf))
3044 proto_tree_write_psml(edt, stdout);
3045 return !ferror(stdout);
3049 if (!print_hex_data(print_stream, edt))
3051 if (!print_line(print_stream, 0, ""))
3060 switch (output_action) {
3063 return print_finale(print_stream);
3068 write_pdml_finale(stdout);
3070 write_psml_finale(stdout);
3071 return !ferror(stdout);
3074 g_assert_not_reached();
3080 show_print_file_io_error(int err)
3086 "tethereal: Not all the packets could be printed because there is "
3087 "no space left on the file system.\n");
3093 "tethereal: Not all the packets could be printed because you are "
3094 "too close to, or over your disk quota.\n");
3100 "tethereal: An error occurred while printing packets: %s.\n",
3107 cf_open_error_message(int err, gchar *err_info, gboolean for_writing,
3111 static char errmsg_errno[1024+1];
3114 /* Wiretap error. */
3117 case WTAP_ERR_NOT_REGULAR_FILE:
3118 errmsg = "The file \"%s\" is a \"special file\" or socket or other non-regular file.";
3121 case WTAP_ERR_FILE_UNKNOWN_FORMAT:
3122 /* Seen only when opening a capture file for reading. */
3123 errmsg = "The file \"%s\" isn't a capture file in a format Tethereal understands.";
3126 case WTAP_ERR_UNSUPPORTED:
3127 /* Seen only when opening a capture file for reading. */
3128 snprintf(errmsg_errno, sizeof(errmsg_errno),
3129 "The file \"%%s\" isn't a capture file in a format Tethereal understands.\n"
3132 errmsg = errmsg_errno;
3135 case WTAP_ERR_CANT_WRITE_TO_PIPE:
3136 /* Seen only when opening a capture file for writing. */
3137 snprintf(errmsg_errno, sizeof(errmsg_errno),
3138 "The file \"%%s\" is a pipe, and %s capture files can't be "
3139 "written to a pipe.", wtap_file_type_string(file_type));
3140 errmsg = errmsg_errno;
3143 case WTAP_ERR_UNSUPPORTED_FILE_TYPE:
3144 /* Seen only when opening a capture file for writing. */
3145 errmsg = "Tethereal doesn't support writing capture files in that format.";
3148 case WTAP_ERR_UNSUPPORTED_ENCAP:
3150 errmsg = "Tethereal can't save this capture in that format.";
3152 snprintf(errmsg_errno, sizeof(errmsg_errno),
3153 "The file \"%%s\" is a capture for a network type that Tethereal doesn't support.\n"
3156 errmsg = errmsg_errno;
3160 case WTAP_ERR_ENCAP_PER_PACKET_UNSUPPORTED:
3162 errmsg = "Tethereal can't save this capture in that format.";
3164 errmsg = "The file \"%s\" is a capture for a network type that Tethereal doesn't support.";
3167 case WTAP_ERR_BAD_RECORD:
3168 /* Seen only when opening a capture file for reading. */
3169 snprintf(errmsg_errno, sizeof(errmsg_errno),
3170 "The file \"%%s\" appears to be damaged or corrupt.\n"
3173 errmsg = errmsg_errno;
3176 case WTAP_ERR_CANT_OPEN:
3178 errmsg = "The file \"%s\" could not be created for some unknown reason.";
3180 errmsg = "The file \"%s\" could not be opened for some unknown reason.";
3183 case WTAP_ERR_SHORT_READ:
3184 errmsg = "The file \"%s\" appears to have been cut short"
3185 " in the middle of a packet or other data.";
3188 case WTAP_ERR_SHORT_WRITE:
3189 errmsg = "A full header couldn't be written to the file \"%s\".";
3193 snprintf(errmsg_errno, sizeof(errmsg_errno),
3194 "The file \"%%s\" could not be %s: %s.",
3195 for_writing ? "created" : "opened",
3196 wtap_strerror(err));
3197 errmsg = errmsg_errno;
3201 errmsg = file_open_error_message(err, for_writing);
3206 * Open/create errors are reported with an console message in Tethereal.
3209 open_failure_message(const char *filename, int err, gboolean for_writing)
3211 fprintf(stderr, "tethereal: ");
3212 fprintf(stderr, file_open_error_message(err, for_writing), filename);
3213 fprintf(stderr, "\n");
3217 cf_open(capture_file *cf, const char *fname, gboolean is_tempfile, int *err)
3221 char err_msg[2048+1];
3223 wth = wtap_open_offline(fname, err, &err_info, FALSE);
3227 /* The open succeeded. Fill in the information for this file. */
3229 /* Initialize all data structures used for dissection. */
3233 cf->filed = -1; /* not used, but set it anyway */
3234 cf->f_len = 0; /* not used, but set it anyway */
3236 /* Set the file name because we need it to set the follow stream filter.
3237 XXX - is that still true? We need it for other reasons, though,
3239 cf->filename = g_strdup(fname);
3241 /* Indicate whether it's a permanent or temporary file. */
3242 cf->is_tempfile = is_tempfile;
3244 /* If it's a temporary capture buffer file, mark it as not saved. */
3245 cf->user_saved = !is_tempfile;
3247 cf->cd_t = wtap_file_type(cf->wth);
3249 cf->drops_known = FALSE;
3253 cf->snap = wtap_snapshot_length(cf->wth);
3254 if (cf->snap == 0) {
3255 /* Snapshot length not known. */
3256 cf->has_snap = FALSE;
3257 cf->snap = WTAP_MAX_PACKET_SIZE;
3259 cf->has_snap = TRUE;
3260 firstsec = 0, firstusec = 0;
3261 prevsec = 0, prevusec = 0;
3266 snprintf(err_msg, sizeof err_msg,
3267 cf_open_error_message(*err, err_info, FALSE, 0), fname);
3268 fprintf(stderr, "tethereal: %s\n", err_msg);
3274 /* Take care of byte order in the libpcap headers read from pipes.
3275 * (function taken from wiretap/libpcap.c) */
3277 adjust_header(loop_data *ldat, struct pcap_hdr *hdr, struct pcaprec_hdr *rechdr)
3279 if (ldat->byte_swapped) {
3280 /* Byte-swap the record header fields. */
3281 rechdr->ts_sec = BSWAP32(rechdr->ts_sec);
3282 rechdr->ts_usec = BSWAP32(rechdr->ts_usec);
3283 rechdr->incl_len = BSWAP32(rechdr->incl_len);
3284 rechdr->orig_len = BSWAP32(rechdr->orig_len);
3287 /* In file format version 2.3, the "incl_len" and "orig_len" fields were
3288 swapped, in order to match the BPF header layout.
3290 Unfortunately, some files were, according to a comment in the "libpcap"
3291 source, written with version 2.3 in their headers but without the
3292 interchanged fields, so if "incl_len" is greater than "orig_len" - which
3293 would make no sense - we assume that we need to swap them. */
3294 if (hdr->version_major == 2 &&
3295 (hdr->version_minor < 3 ||
3296 (hdr->version_minor == 3 && rechdr->incl_len > rechdr->orig_len))) {
3299 temp = rechdr->orig_len;
3300 rechdr->orig_len = rechdr->incl_len;
3301 rechdr->incl_len = temp;
3305 /* Mimic pcap_open_live() for pipe captures
3306 * We check if "pipename" is "-" (stdin) or a FIFO, open it, and read the
3308 * N.B. : we can't read the libpcap formats used in RedHat 6.1 or SuSE 6.3
3309 * because we can't seek on pipes (see wiretap/libpcap.c for details) */
3311 pipe_open_live(char *pipename, struct pcap_hdr *hdr, loop_data *ldat,
3312 char *errmsg, int errmsgl)
3314 struct stat pipe_stat;
3318 unsigned int bytes_read;
3321 * XXX Tethereal blocks until we return
3323 if (strcmp(pipename, "-") == 0)
3324 fd = 0; /* read from stdin */
3326 if (stat(pipename, &pipe_stat) < 0) {
3327 if (errno == ENOENT || errno == ENOTDIR)
3328 ldat->pipe_err = PIPNEXIST;
3330 snprintf(errmsg, errmsgl,
3331 "The capture session could not be initiated "
3332 "due to error on pipe: %s", strerror(errno));
3333 ldat->pipe_err = PIPERR;
3337 if (! S_ISFIFO(pipe_stat.st_mode)) {
3338 if (S_ISCHR(pipe_stat.st_mode)) {
3340 * Assume the user specified an interface on a system where
3341 * interfaces are in /dev. Pretend we haven't seen it.
3343 ldat->pipe_err = PIPNEXIST;
3345 snprintf(errmsg, errmsgl,
3346 "The capture session could not be initiated because\n"
3347 "\"%s\" is neither an interface nor a pipe", pipename);
3348 ldat->pipe_err = PIPERR;
3352 fd = open(pipename, O_RDONLY);
3354 snprintf(errmsg, errmsgl,
3355 "The capture session could not be initiated "
3356 "due to error on pipe open: %s", strerror(errno));
3357 ldat->pipe_err = PIPERR;
3362 ldat->from_pipe = TRUE;
3364 /* read the pcap header */
3366 while (bytes_read < sizeof magic) {
3367 b = read(fd, ((char *)&magic)+bytes_read, sizeof magic-bytes_read);
3370 snprintf(errmsg, errmsgl, "End of file on pipe during open");
3372 snprintf(errmsg, errmsgl, "Error on pipe during open: %s",
3381 /* Host that wrote it has our byte order, and was running
3382 a program using either standard or ss990417 libpcap. */
3383 ldat->byte_swapped = FALSE;
3384 ldat->modified = FALSE;
3386 case PCAP_MODIFIED_MAGIC:
3387 /* Host that wrote it has our byte order, but was running
3388 a program using either ss990915 or ss991029 libpcap. */
3389 ldat->byte_swapped = FALSE;
3390 ldat->modified = TRUE;
3392 case PCAP_SWAPPED_MAGIC:
3393 /* Host that wrote it has a byte order opposite to ours,
3394 and was running a program using either standard or
3395 ss990417 libpcap. */
3396 ldat->byte_swapped = TRUE;
3397 ldat->modified = FALSE;
3399 case PCAP_SWAPPED_MODIFIED_MAGIC:
3400 /* Host that wrote it out has a byte order opposite to
3401 ours, and was running a program using either ss990915
3402 or ss991029 libpcap. */
3403 ldat->byte_swapped = TRUE;
3404 ldat->modified = TRUE;
3407 /* Not a "libpcap" type we know about. */
3408 snprintf(errmsg, errmsgl, "Unrecognized libpcap format");
3412 /* Read the rest of the header */
3414 while (bytes_read < sizeof(struct pcap_hdr)) {
3415 b = read(fd, ((char *)hdr)+bytes_read,
3416 sizeof(struct pcap_hdr) - bytes_read);
3419 snprintf(errmsg, errmsgl, "End of file on pipe during open");
3421 snprintf(errmsg, errmsgl, "Error on pipe during open: %s",
3428 if (ldat->byte_swapped) {
3429 /* Byte-swap the header fields about which we care. */
3430 hdr->version_major = BSWAP16(hdr->version_major);
3431 hdr->version_minor = BSWAP16(hdr->version_minor);
3432 hdr->snaplen = BSWAP32(hdr->snaplen);
3433 hdr->network = BSWAP32(hdr->network);
3436 if (hdr->version_major < 2) {
3437 snprintf(errmsg, errmsgl, "Unable to read old libpcap format");
3441 ldat->pipe_state = STATE_EXPECT_REC_HDR;
3442 ldat->pipe_err = PIPOK;
3446 ldat->pipe_err = PIPERR;
3451 /* We read one record from the pipe, take care of byte order in the record
3452 * header, write the record in the capture file, and update capture statistics. */
3455 pipe_dispatch(int fd, loop_data *ldat, struct pcap_hdr *hdr,
3456 struct pcaprec_modified_hdr *rechdr, guchar *data,
3457 char *errmsg, int errmsgl)
3459 struct pcap_pkthdr phdr;
3461 enum { PD_REC_HDR_READ, PD_DATA_READ, PD_PIPE_EOF, PD_PIPE_ERR,
3464 switch (ldat->pipe_state) {
3466 case STATE_EXPECT_REC_HDR:
3467 ldat->bytes_to_read = ldat->modified ?
3468 sizeof(struct pcaprec_modified_hdr) : sizeof(struct pcaprec_hdr);
3469 ldat->bytes_read = 0;
3470 ldat->pipe_state = STATE_READ_REC_HDR;
3473 case STATE_READ_REC_HDR:
3474 b = read(fd, ((char *)rechdr)+ldat->bytes_read,
3475 ldat->bytes_to_read - ldat->bytes_read);
3478 result = PD_PIPE_EOF;
3480 result = PD_PIPE_ERR;
3483 if ((ldat->bytes_read += b) < ldat->bytes_to_read)
3485 result = PD_REC_HDR_READ;
3488 case STATE_EXPECT_DATA:
3489 ldat->bytes_read = 0;
3490 ldat->pipe_state = STATE_READ_DATA;
3493 case STATE_READ_DATA:
3494 b = read(fd, data+ldat->bytes_read, rechdr->hdr.incl_len - ldat->bytes_read);
3497 result = PD_PIPE_EOF;
3499 result = PD_PIPE_ERR;
3502 if ((ldat->bytes_read += b) < rechdr->hdr.incl_len)
3504 result = PD_DATA_READ;
3508 snprintf(errmsg, errmsgl, "pipe_dispatch: invalid state");
3511 } /* switch (ldat->pipe_state) */
3514 * We've now read as much data as we were expecting, so process it.
3518 case PD_REC_HDR_READ:
3519 /* We've read the header. Take care of byte order. */
3520 adjust_header(ldat, hdr, &rechdr->hdr);
3521 if (rechdr->hdr.incl_len > WTAP_MAX_PACKET_SIZE) {
3522 snprintf(errmsg, errmsgl, "Frame %u too long (%d bytes)",
3523 ldat->packet_count+1, rechdr->hdr.incl_len);
3526 ldat->pipe_state = STATE_EXPECT_DATA;
3530 /* Fill in a "struct pcap_pkthdr", and process the packet. */
3531 phdr.ts.tv_sec = rechdr->hdr.ts_sec;
3532 phdr.ts.tv_usec = rechdr->hdr.ts_usec;
3533 phdr.caplen = rechdr->hdr.incl_len;
3534 phdr.len = rechdr->hdr.orig_len;
3536 capture_pcap_cb((guchar *)ldat, &phdr, data);
3538 ldat->pipe_state = STATE_EXPECT_REC_HDR;
3542 ldat->pipe_err = PIPEOF;
3546 snprintf(errmsg, errmsgl, "Error reading from pipe: %s",
3553 ldat->pipe_err = PIPERR;
3554 /* Return here rather than inside the switch to prevent GCC warning */
3558 #endif /* HAVE_LIBPCAP */
3561 * General errors are reported with an console message in Tethereal.
3564 failure_message(const char *msg_format, va_list ap)
3566 fprintf(stderr, "tethereal: ");
3567 vfprintf(stderr, msg_format, ap);
3568 fprintf(stderr, "\n");
3572 * Read errors are reported with an console message in Tethereal.
3575 read_failure_message(const char *filename, int err)
3577 fprintf(stderr, "tethereal: An error occurred while reading from the file \"%s\": %s.\n",
3578 filename, strerror(err));