2 * Routines for capture options setting
6 * Wireshark - Network traffic analyzer
7 * By Gerald Combs <gerald@wireshark.org>
8 * Copyright 1998 Gerald Combs
10 * This program is free software; you can redistribute it and/or
11 * modify it under the terms of the GNU General Public License
12 * as published by the Free Software Foundation; either version 2
13 * of the License, or (at your option) any later version.
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU General Public License for more details.
20 * You should have received a copy of the GNU General Public License
21 * along with this program; if not, write to the Free Software
22 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
38 #ifdef HAVE_SYS_TYPES_H
39 # include <sys/types.h>
42 #ifdef HAVE_NETINET_IN_H
43 #include <netinet/in.h>
46 #ifdef HAVE_ARPA_INET_H
47 #include <arpa/inet.h>
50 #ifdef HAVE_SYS_SOCKET_H
51 #include <sys/socket.h> /* needed to define AF_ values on UNIX */
54 #ifdef HAVE_WINSOCK2_H
55 #include <winsock2.h> /* needed to define AF_ values on Windows */
58 #ifdef NEED_INET_V6DEFS_H
59 # include "inet_v6defs.h"
64 #include <epan/packet.h>
66 #include "capture_opts.h"
67 #include "ringbuffer.h"
68 #include "clopts_common.h"
69 #include "cmdarg_err.h"
71 #include "capture-pcap-util.h"
72 #include <wsutil/file_util.h>
74 static gboolean capture_opts_output_to_pipe(const char *save_file, gboolean *is_pipe);
78 capture_opts_init(capture_options *capture_opts, void *cf)
80 capture_opts->cf = cf;
81 capture_opts->cfilter = g_strdup(""); /* No capture filter string specified */
82 capture_opts->iface = NULL; /* Default is "pick the first interface" */
83 capture_opts->iface_descr = NULL;
84 #ifdef HAVE_PCAP_REMOTE
85 capture_opts->src_type = CAPTURE_IFLOCAL;
86 capture_opts->remote_host = NULL;
87 capture_opts->remote_port = NULL;
88 capture_opts->auth_type = CAPTURE_AUTH_NULL;
89 capture_opts->auth_username = NULL;
90 capture_opts->auth_password = NULL;
91 capture_opts->datatx_udp = FALSE;
92 capture_opts->nocap_rpcap = TRUE;
93 capture_opts->nocap_local = FALSE;
94 #ifdef HAVE_PCAP_SETSAMPLING
95 capture_opts->sampling_method = CAPTURE_SAMP_NONE;
96 capture_opts->sampling_param = 0;
100 capture_opts->buffer_size = 1; /* 1 MB */
102 capture_opts->has_snaplen = FALSE;
103 capture_opts->snaplen = WTAP_MAX_PACKET_SIZE; /* snapshot length - default is
104 infinite, in effect */
105 capture_opts->promisc_mode = TRUE; /* promiscuous mode is the default */
106 capture_opts->linktype = -1; /* the default linktype */
107 capture_opts->saving_to_file = FALSE;
108 capture_opts->save_file = NULL;
109 capture_opts->real_time_mode = TRUE;
110 capture_opts->show_info = TRUE;
111 capture_opts->quit_after_cap = FALSE;
112 capture_opts->restart = FALSE;
114 capture_opts->multi_files_on = FALSE;
115 capture_opts->has_file_duration = FALSE;
116 capture_opts->file_duration = 60; /* 1 min */
117 capture_opts->has_ring_num_files = FALSE;
118 capture_opts->ring_num_files = RINGBUFFER_MIN_NUM_FILES;
120 capture_opts->has_autostop_files = FALSE;
121 capture_opts->autostop_files = 1;
122 capture_opts->has_autostop_packets = FALSE;
123 capture_opts->autostop_packets = 0;
124 capture_opts->has_autostop_filesize = FALSE;
125 capture_opts->autostop_filesize = 1024; /* 1 MB */
126 capture_opts->has_autostop_duration = FALSE;
127 capture_opts->autostop_duration = 60; /* 1 min */
130 capture_opts->fork_child = -1; /* invalid process handle */
132 capture_opts->signal_pipe_write_fd = -1;
134 capture_opts->state = CAPTURE_STOPPED;
135 capture_opts->output_to_pipe = FALSE;
137 capture_opts->owner = getuid();
138 capture_opts->group = getgid();
143 /* log content of capture_opts */
145 capture_opts_log(const char *log_domain, GLogLevelFlags log_level, capture_options *capture_opts) {
146 g_log(log_domain, log_level, "CAPTURE OPTIONS :");
147 g_log(log_domain, log_level, "CFile : 0x%p", capture_opts->cf);
148 g_log(log_domain, log_level, "Filter : %s", capture_opts->cfilter);
149 g_log(log_domain, log_level, "Interface : %s", capture_opts->iface);
150 /* iface_descr may not been filled in and some C Libraries hate a null ptr for %s */
151 g_log(log_domain, log_level, "Interface Descr : %s",
152 capture_opts->iface_descr ? capture_opts->iface_descr : "<null>");
153 #ifdef HAVE_PCAP_REMOTE
154 g_log(log_domain, log_level, "Capture source : %s",
155 capture_opts->src_type == CAPTURE_IFLOCAL ? "Local interface" :
156 capture_opts->src_type == CAPTURE_IFREMOTE ? "Remote interface" :
158 if (capture_opts->src_type == CAPTURE_IFREMOTE) {
159 g_log(log_domain, log_level, "Remote host : %s", capture_opts->remote_host);
160 g_log(log_domain, log_level, "Remote port : %s", capture_opts->remote_port);
162 g_log(log_domain, log_level, "Authentication : %s",
163 capture_opts->auth_type == CAPTURE_AUTH_NULL ? "Null" :
164 capture_opts->auth_type == CAPTURE_AUTH_PWD ? "By username/password" :
166 if (capture_opts->auth_type == CAPTURE_AUTH_PWD) {
167 g_log(log_domain, log_level, "Auth username : %s", capture_opts->auth_password);
168 g_log(log_domain, log_level, "Auth password : <hidden>");
170 g_log(log_domain, log_level, "UDP data transfer : %u", capture_opts->datatx_udp);
171 g_log(log_domain, log_level, "No capture RPCAP : %u", capture_opts->nocap_rpcap);
172 g_log(log_domain, log_level, "No capture local : %u", capture_opts->nocap_local);
175 g_log(log_domain, log_level, "BufferSize : %u (MB)", capture_opts->buffer_size);
177 g_log(log_domain, log_level, "SnapLen (%u): %u", capture_opts->has_snaplen, capture_opts->snaplen);
178 g_log(log_domain, log_level, "Promisc : %u", capture_opts->promisc_mode);
179 g_log(log_domain, log_level, "LinkType : %d", capture_opts->linktype);
180 g_log(log_domain, log_level, "SavingToFile : %u", capture_opts->saving_to_file);
181 g_log(log_domain, log_level, "SaveFile : %s", (capture_opts->save_file) ? capture_opts->save_file : "");
182 g_log(log_domain, log_level, "RealTimeMode : %u", capture_opts->real_time_mode);
183 g_log(log_domain, log_level, "ShowInfo : %u", capture_opts->show_info);
184 g_log(log_domain, log_level, "QuitAfterCap : %u", capture_opts->quit_after_cap);
186 g_log(log_domain, log_level, "MultiFilesOn : %u", capture_opts->multi_files_on);
187 g_log(log_domain, log_level, "FileDuration (%u): %u", capture_opts->has_file_duration, capture_opts->file_duration);
188 g_log(log_domain, log_level, "RingNumFiles (%u): %u", capture_opts->has_ring_num_files, capture_opts->ring_num_files);
190 g_log(log_domain, log_level, "AutostopFiles (%u): %u", capture_opts->has_autostop_files, capture_opts->autostop_files);
191 g_log(log_domain, log_level, "AutostopPackets (%u): %u", capture_opts->has_autostop_packets, capture_opts->autostop_packets);
192 g_log(log_domain, log_level, "AutostopFilesize(%u): %u (KB)", capture_opts->has_autostop_filesize, capture_opts->autostop_filesize);
193 g_log(log_domain, log_level, "AutostopDuration(%u): %u", capture_opts->has_autostop_duration, capture_opts->autostop_duration);
195 g_log(log_domain, log_level, "ForkChild : %d", capture_opts->fork_child);
197 g_log(log_domain, log_level, "SignalPipeWrite : %d", capture_opts->signal_pipe_write_fd);
202 * Given a string of the form "<autostop criterion>:<value>", as might appear
203 * as an argument to a "-a" option, parse it and set the criterion in
204 * question. Return an indication of whether it succeeded or failed
208 set_autostop_criterion(capture_options *capture_opts, const char *autostoparg)
212 colonp = strchr(autostoparg, ':');
220 * Skip over any white space (there probably won't be any, but
221 * as we allow it in the preferences file, we might as well
224 while (isspace((guchar)*p))
228 * Put the colon back, so if our caller uses, in an
229 * error message, the string they passed us, the message
235 if (strcmp(autostoparg,"duration") == 0) {
236 capture_opts->has_autostop_duration = TRUE;
237 capture_opts->autostop_duration = get_positive_int(p,"autostop duration");
238 } else if (strcmp(autostoparg,"filesize") == 0) {
239 capture_opts->has_autostop_filesize = TRUE;
240 capture_opts->autostop_filesize = get_positive_int(p,"autostop filesize");
241 } else if (strcmp(autostoparg,"files") == 0) {
242 capture_opts->multi_files_on = TRUE;
243 capture_opts->has_autostop_files = TRUE;
244 capture_opts->autostop_files = get_positive_int(p,"autostop files");
248 *colonp = ':'; /* put the colon back */
253 * Given a string of the form "<ring buffer file>:<duration>", as might appear
254 * as an argument to a "-b" option, parse it and set the arguments in
255 * question. Return an indication of whether it succeeded or failed
259 get_ring_arguments(capture_options *capture_opts, const char *arg)
261 gchar *p = NULL, *colonp;
263 colonp = strchr(arg, ':');
271 * Skip over any white space (there probably won't be any, but
272 * as we allow it in the preferences file, we might as well
275 while (isspace((guchar)*p))
279 * Put the colon back, so if our caller uses, in an
280 * error message, the string they passed us, the message
287 if (strcmp(arg,"files") == 0) {
288 capture_opts->has_ring_num_files = TRUE;
289 capture_opts->ring_num_files = get_natural_int(p, "number of ring buffer files");
290 } else if (strcmp(arg,"filesize") == 0) {
291 capture_opts->has_autostop_filesize = TRUE;
292 capture_opts->autostop_filesize = get_positive_int(p, "ring buffer filesize");
293 } else if (strcmp(arg,"duration") == 0) {
294 capture_opts->has_file_duration = TRUE;
295 capture_opts->file_duration = get_positive_int(p, "ring buffer duration");
298 *colonp = ':'; /* put the colon back */
302 #ifdef HAVE_PCAP_SETSAMPLING
304 * Given a string of the form "<sampling type>:<value>", as might appear
305 * as an argument to a "-m" option, parse it and set the arguments in
306 * question. Return an indication of whether it succeeded or failed
310 get_sampling_arguments(capture_options *capture_opts, const char *arg)
312 gchar *p = NULL, *colonp;
314 colonp = strchr(arg, ':');
321 while (isspace((guchar)*p))
328 if (strcmp(arg, "count") == 0) {
329 capture_opts->sampling_method = CAPTURE_SAMP_BY_COUNT;
330 capture_opts->sampling_param = get_positive_int(p, "sampling count");
331 } else if (strcmp(arg, "timer") == 0) {
332 capture_opts->sampling_method = CAPTURE_SAMP_BY_TIMER;
333 capture_opts->sampling_param = get_positive_int(p, "sampling timer");
340 #ifdef HAVE_PCAP_REMOTE
342 * Given a string of the form "<username>:<password>", as might appear
343 * as an argument to a "-A" option, parse it and set the arguments in
344 * question. Return an indication of whether it succeeded or failed
348 get_auth_arguments(capture_options *capture_opts, const char *arg)
350 gchar *p = NULL, *colonp;
352 colonp = strchr(arg, ':');
359 while (isspace((guchar)*p))
362 capture_opts->auth_type = CAPTURE_AUTH_PWD;
363 capture_opts->auth_username = g_strdup(arg);
364 capture_opts->auth_password = g_strdup(p);
371 capture_opts_add_iface_opt(capture_options *capture_opts, const char *optarg)
382 * If the argument is a number, treat it as an index into the list
383 * of adapters, as printed by "tshark -D".
385 * This should be OK on UNIX systems, as interfaces shouldn't have
386 * names that begin with digits. It can be useful on Windows, where
387 * more than one interface can have the same name.
389 adapter_index = strtol(optarg, &p, 10);
390 if (p != NULL && *p == '\0') {
391 if (adapter_index < 0) {
392 cmdarg_err("The specified adapter index is a negative number");
395 if (adapter_index > INT_MAX) {
396 cmdarg_err("The specified adapter index is too large (greater than %d)",
400 if (adapter_index == 0) {
401 cmdarg_err("There is no interface with that adapter index");
404 if_list = get_interface_list(&err, &err_str);
405 if (if_list == NULL) {
408 case CANT_GET_INTERFACE_LIST:
409 cmdarg_err("%s", err_str);
413 case NO_INTERFACES_FOUND:
414 cmdarg_err("There are no interfaces on which a capture can be done");
419 if_info = g_list_nth_data(if_list, adapter_index - 1);
420 if (if_info == NULL) {
421 cmdarg_err("There is no interface with that adapter index");
424 capture_opts->iface = g_strdup(if_info->name);
425 /* We don't set iface_descr here because doing so requires
426 * capture_ui_utils.c which requires epan/prefs.c which is
427 * probably a bit too much dependency for here...
429 free_interface_list(if_list);
431 capture_opts->iface = g_strdup(optarg);
438 capture_opts_add_opt(capture_options *capture_opts, int opt, const char *optarg, gboolean *start_capture)
443 case 'a': /* autostop criteria */
444 if (set_autostop_criterion(capture_opts, optarg) == FALSE) {
445 cmdarg_err("Invalid or unknown -a flag \"%s\"", optarg);
449 #ifdef HAVE_PCAP_REMOTE
451 if (get_auth_arguments(capture_opts, optarg) == FALSE) {
452 cmdarg_err("Invalid or unknown -A arg \"%s\"", optarg);
457 case 'b': /* Ringbuffer option */
458 capture_opts->multi_files_on = TRUE;
459 if (get_ring_arguments(capture_opts, optarg) == FALSE) {
460 cmdarg_err("Invalid or unknown -b arg \"%s\"", optarg);
465 case 'B': /* Buffer size */
466 capture_opts->buffer_size = get_positive_int(optarg, "buffer size");
469 case 'c': /* Capture n packets */
470 capture_opts->has_autostop_packets = TRUE;
471 capture_opts->autostop_packets = get_positive_int(optarg, "packet count");
473 case 'f': /* capture filter */
474 if (capture_opts->has_cfilter) {
475 cmdarg_err("More than one -f argument specified");
478 capture_opts->has_cfilter = TRUE;
479 g_free(capture_opts->cfilter);
480 capture_opts->cfilter = g_strdup(optarg);
482 case 'H': /* Hide capture info dialog box */
483 capture_opts->show_info = FALSE;
485 case 'i': /* Use interface x */
486 status = capture_opts_add_iface_opt(capture_opts, optarg);
491 case 'k': /* Start capture immediately */
492 *start_capture = TRUE;
494 /*case 'l':*/ /* Automatic scrolling in live capture mode */
495 #ifdef HAVE_PCAP_SETSAMPLING
497 if (get_sampling_arguments(capture_opts, optarg) == FALSE) {
498 cmdarg_err("Invalid or unknown -m arg \"%s\"", optarg);
503 case 'p': /* Don't capture in promiscuous mode */
504 capture_opts->promisc_mode = FALSE;
506 case 'Q': /* Quit after capture (just capture to file) */
507 capture_opts->quit_after_cap = TRUE;
508 *start_capture = TRUE; /*** -Q implies -k !! ***/
510 #ifdef HAVE_PCAP_REMOTE
512 capture_opts->nocap_rpcap = FALSE;
515 case 's': /* Set the snapshot (capture) length */
516 capture_opts->has_snaplen = TRUE;
517 capture_opts->snaplen = get_natural_int(optarg, "snapshot length");
519 * Make a snapshot length of 0 equivalent to the maximum packet
520 * length, mirroring what tcpdump does.
522 if (capture_opts->snaplen == 0)
523 capture_opts->snaplen = WTAP_MAX_PACKET_SIZE;
525 case 'S': /* "Real-Time" mode: used for following file ala tail -f */
526 capture_opts->real_time_mode = TRUE;
528 #ifdef HAVE_PCAP_REMOTE
530 capture_opts->datatx_udp = TRUE;
533 case 'w': /* Write to capture file x */
534 capture_opts->saving_to_file = TRUE;
535 g_free(capture_opts->save_file);
536 #if defined _WIN32 && GLIB_CHECK_VERSION(2,6,0)
537 /* since GLib 2.6, we need to convert filenames to utf8 for Win32 */
538 capture_opts->save_file = g_locale_to_utf8(optarg, -1, NULL, NULL, NULL);
540 capture_opts->save_file = g_strdup(optarg);
542 status = capture_opts_output_to_pipe(capture_opts->save_file, &capture_opts->output_to_pipe);
544 case 'y': /* Set the pcap data link type */
545 capture_opts->linktype = linktype_name_to_val(optarg);
546 if (capture_opts->linktype == -1) {
547 cmdarg_err("The specified data link type \"%s\" isn't valid",
553 /* the caller is responsible to send us only the right opt's */
554 g_assert_not_reached();
561 * If you change the output format of this function, you MUST update
562 * capture_sync.c:sync_linktype_list_open() accordingly!
565 capture_opts_list_link_layer_types(capture_options *capture_opts, gboolean machine_readable)
567 gchar *err_str, *desc_str;
568 GList *lt_list, *lt_entry;
569 data_link_info_t *data_link_info;
571 /* Get the list of link-layer types for the capture device. */
572 lt_list = get_pcap_linktype_list(capture_opts->iface, &err_str);
573 if (lt_list == NULL) {
574 if (err_str != NULL) {
575 cmdarg_err("The list of data link types for the capture device \"%s\" could not be obtained (%s)."
576 "Please check to make sure you have sufficient permissions, and that\n"
577 "you have the proper interface or pipe specified.\n", capture_opts->iface, err_str);
580 cmdarg_err("The capture device \"%s\" has no data link types.", capture_opts->iface);
583 if (machine_readable) { /* tab-separated values to stdout */
584 for (lt_entry = lt_list; lt_entry != NULL; lt_entry = g_list_next(lt_entry)) {
585 data_link_info = lt_entry->data;
586 if (data_link_info->description != NULL)
587 desc_str = data_link_info->description;
589 desc_str = "(not supported)";
590 printf("%d\t%s\t%s\n", data_link_info->dlt, data_link_info->name,
594 cmdarg_err_cont("Data link types (use option -y to set):");
595 for (lt_entry = lt_list; lt_entry != NULL;
596 lt_entry = g_list_next(lt_entry)) {
597 data_link_info = lt_entry->data;
598 cmdarg_err_cont(" %s", data_link_info->name);
599 if (data_link_info->description != NULL)
600 cmdarg_err_cont(" (%s)", data_link_info->description);
602 cmdarg_err_cont(" (not supported)");
606 free_pcap_linktype_list(lt_list);
611 /* Return an ASCII-formatted list of interfaces. */
612 #define ADDRSTRLEN 46 /* Covers IPv4 & IPv6 */
614 capture_opts_list_interfaces(gboolean machine_readable)
624 char addr_str[ADDRSTRLEN];
626 if_list = get_interface_list(&err, &err_str);
627 if (if_list == NULL) {
629 case CANT_GET_INTERFACE_LIST:
630 cmdarg_err("%s", err_str);
634 case NO_INTERFACES_FOUND:
635 cmdarg_err("There are no interfaces on which a capture can be done");
641 i = 1; /* Interface id number */
642 for (if_entry = g_list_first(if_list); if_entry != NULL;
643 if_entry = g_list_next(if_entry)) {
644 if_info = if_entry->data;
645 printf("%d. %s", i++, if_info->name);
647 if (!machine_readable) {
648 /* Add the description if it exists */
649 if (if_info->description != NULL)
650 printf(" (%s)", if_info->description);
653 * Add the contents of the if_entry struct in a parseable format.
654 * Each if_entry element is tab-separated. Addresses are comma-
657 /* XXX - Make sure our description doesn't contain a tab */
658 if (if_info->description != NULL)
659 printf("\t%s\t", if_info->description);
663 for(ip_addr = g_slist_nth(if_info->ip_addr, 0); ip_addr != NULL;
664 ip_addr = g_slist_next(ip_addr)) {
665 if (ip_addr != g_slist_nth(if_info->ip_addr, 0))
668 if_addr = ip_addr->data;
669 switch(if_addr->type) {
671 if (inet_ntop(AF_INET, &if_addr->ip_addr.ip4_addr, addr_str,
673 printf("%s", addr_str);
675 printf("<unknown IPv4>");
679 if (inet_ntop(AF_INET6, &if_addr->ip_addr.ip6_addr,
680 addr_str, ADDRSTRLEN)) {
681 printf("%s", addr_str);
683 printf("<unknown IPv6>");
687 printf("<type unknown %u>", if_addr->type);
691 if (if_info->loopback)
692 printf("\tloopback");
699 free_interface_list(if_list);
705 void capture_opts_trim_snaplen(capture_options *capture_opts, int snaplen_min)
707 if (capture_opts->snaplen < 1)
708 capture_opts->snaplen = WTAP_MAX_PACKET_SIZE;
709 else if (capture_opts->snaplen < snaplen_min)
710 capture_opts->snaplen = snaplen_min;
714 void capture_opts_trim_ring_num_files(capture_options *capture_opts)
716 /* Check the value range of the ring_num_files parameter */
717 if (capture_opts->ring_num_files > RINGBUFFER_MAX_NUM_FILES)
718 capture_opts->ring_num_files = RINGBUFFER_MAX_NUM_FILES;
719 #if RINGBUFFER_MIN_NUM_FILES > 0
720 else if (capture_opts->ring_num_files < RINGBUFFER_MIN_NUM_FILES)
721 capture_opts->ring_num_files = RINGBUFFER_MIN_NUM_FILES;
726 gboolean capture_opts_trim_iface(capture_options *capture_opts, const char *capture_device)
734 /* Did the user specify an interface to use? */
735 if (capture_opts->iface == NULL) {
736 /* No - is a default specified in the preferences file? */
737 if (capture_device != NULL) {
739 capture_opts->iface = g_strdup(capture_device);
740 /* We don't set iface_descr here because doing so requires
741 * capture_ui_utils.c which requires epan/prefs.c which is
742 * probably a bit too much dependency for here...
745 /* No - pick the first one from the list of interfaces. */
746 if_list = get_interface_list(&err, &err_str);
747 if (if_list == NULL) {
750 case CANT_GET_INTERFACE_LIST:
751 cmdarg_err("%s", err_str);
755 case NO_INTERFACES_FOUND:
756 cmdarg_err("There are no interfaces on which a capture can be done");
761 if_info = if_list->data; /* first interface */
762 capture_opts->iface = g_strdup(if_info->name);
763 /* We don't set iface_descr here because doing so requires
764 * capture_ui_utils.c which requires epan/prefs.c which is
765 * probably a bit too much dependency for here...
767 free_interface_list(if_list);
777 #define S_IFIFO _S_IFIFO
780 #define S_ISFIFO(mode) (((mode) & S_IFMT) == S_IFIFO)
783 /* copied from filesystem.c */
784 static int capture_opts_test_for_fifo(const char *path)
788 if (ws_stat(path, &statb) < 0)
791 if (S_ISFIFO(statb.st_mode))
797 static gboolean capture_opts_output_to_pipe(const char *save_file, gboolean *is_pipe)
803 if (save_file != NULL) {
804 /* We're writing to a capture file. */
805 if (strcmp(save_file, "-") == 0) {
806 /* Writing to stdout. */
807 /* XXX - should we check whether it's a pipe? It's arguably
808 silly to do "-w - >output_file" rather than "-w output_file",
809 but by not checking we might be violating the Principle Of
810 Least Astonishment. */
813 /* not writing to stdout, test for a FIFO (aka named pipe) */
814 err = capture_opts_test_for_fifo(save_file);
817 case ENOENT: /* it doesn't exist, so we'll be creating it,
818 and it won't be a FIFO */
819 case 0: /* found it, but it's not a FIFO */
822 case ESPIPE: /* it is a FIFO */
826 default: /* couldn't stat it */
827 break; /* ignore: later attempt to open */
828 /* will generate a nice msg */
836 #endif /* HAVE_LIBPCAP */