2 * Routines for capture options setting
6 * Ethereal - Network traffic analyzer
7 * By Gerald Combs <gerald@ethereal.com>
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.
36 #include <epan/packet.h>
39 #include "capture_opts.h"
40 #include "ringbuffer.h"
41 #include "clopts_common.h"
42 #include "cmdarg_err.h"
44 #include "capture-pcap-util.h"
45 #include <wiretap/file_util.h>
48 static gboolean capture_opts_output_to_pipe(const char *save_file, gboolean *is_pipe);
52 capture_opts_init(capture_options *capture_opts, void *cfile)
54 capture_opts->cf = cfile;
55 capture_opts->cfilter = g_strdup(""); /* No capture filter string specified */
56 capture_opts->iface = NULL; /* Default is "pick the first interface" */
58 capture_opts->buffer_size = 1; /* 1 MB */
60 capture_opts->has_snaplen = FALSE;
61 capture_opts->snaplen = WTAP_MAX_PACKET_SIZE; /* snapshot length - default is
62 infinite, in effect */
63 capture_opts->promisc_mode = TRUE; /* promiscuous mode is the default */
64 capture_opts->linktype = -1; /* the default linktype */
65 capture_opts->save_file = NULL;
66 capture_opts->real_time_mode = TRUE;
67 capture_opts->show_info = TRUE;
68 capture_opts->quit_after_cap = FALSE;
69 capture_opts->restart = FALSE;
71 capture_opts->multi_files_on = FALSE;
72 capture_opts->has_file_duration = FALSE;
73 capture_opts->file_duration = 60; /* 1 min */
74 capture_opts->has_ring_num_files = FALSE;
75 capture_opts->ring_num_files = RINGBUFFER_MIN_NUM_FILES;
77 capture_opts->has_autostop_files = FALSE;
78 capture_opts->autostop_files = 1;
79 capture_opts->has_autostop_packets = FALSE;
80 capture_opts->autostop_packets = 0;
81 capture_opts->has_autostop_filesize = FALSE;
82 capture_opts->autostop_filesize = 1024; /* 1 MB */
83 capture_opts->has_autostop_duration = FALSE;
84 capture_opts->autostop_duration = 60; /* 1 min */
87 capture_opts->fork_child = -1; /* invalid process handle */
89 capture_opts->signal_pipe_write_fd = -1;
91 capture_opts->state = CAPTURE_STOPPED;
92 capture_opts->output_to_pipe = FALSE;
96 /* log content of capture_opts */
98 capture_opts_log(const char *log_domain, GLogLevelFlags log_level, capture_options *capture_opts) {
99 g_log(log_domain, log_level, "CAPTURE OPTIONS :");
100 g_log(log_domain, log_level, "CFile : 0x%p", capture_opts->cf);
101 g_log(log_domain, log_level, "Filter : %s", capture_opts->cfilter);
102 g_log(log_domain, log_level, "Interface : %s", capture_opts->iface);
104 g_log(log_domain, log_level, "BufferSize : %u (MB)", capture_opts->buffer_size);
106 g_log(log_domain, log_level, "SnapLen (%u): %u", capture_opts->has_snaplen, capture_opts->snaplen);
107 g_log(log_domain, log_level, "Promisc : %u", capture_opts->promisc_mode);
108 g_log(log_domain, log_level, "LinkType : %d", capture_opts->linktype);
109 g_log(log_domain, log_level, "SaveFile : %s", (capture_opts->save_file) ? capture_opts->save_file : "");
110 g_log(log_domain, log_level, "RealTimeMode : %u", capture_opts->real_time_mode);
111 g_log(log_domain, log_level, "ShowInfo : %u", capture_opts->show_info);
112 g_log(log_domain, log_level, "QuitAfterCap : %u", capture_opts->quit_after_cap);
114 g_log(log_domain, log_level, "MultiFilesOn : %u", capture_opts->multi_files_on);
115 g_log(log_domain, log_level, "FileDuration (%u): %u", capture_opts->has_file_duration, capture_opts->file_duration);
116 g_log(log_domain, log_level, "RingNumFiles (%u): %u", capture_opts->has_ring_num_files, capture_opts->ring_num_files);
118 g_log(log_domain, log_level, "AutostopFiles (%u): %u", capture_opts->has_autostop_files, capture_opts->autostop_files);
119 g_log(log_domain, log_level, "AutostopPackets (%u): %u", capture_opts->has_autostop_packets, capture_opts->autostop_packets);
120 g_log(log_domain, log_level, "AutostopFilesize(%u): %u (KB)", capture_opts->has_autostop_filesize, capture_opts->autostop_filesize);
121 g_log(log_domain, log_level, "AutostopDuration(%u): %u", capture_opts->has_autostop_duration, capture_opts->autostop_duration);
123 g_log(log_domain, log_level, "ForkChild : %d", capture_opts->fork_child);
125 g_log(log_domain, log_level, "SignalPipeWrite : %d", capture_opts->signal_pipe_write_fd);
130 * Given a string of the form "<autostop criterion>:<value>", as might appear
131 * as an argument to a "-a" option, parse it and set the criterion in
132 * question. Return an indication of whether it succeeded or failed
136 set_autostop_criterion(capture_options *capture_opts, const char *autostoparg)
140 colonp = strchr(autostoparg, ':');
148 * Skip over any white space (there probably won't be any, but
149 * as we allow it in the preferences file, we might as well
152 while (isspace((guchar)*p))
156 * Put the colon back, so if our caller uses, in an
157 * error message, the string they passed us, the message
163 if (strcmp(autostoparg,"duration") == 0) {
164 capture_opts->has_autostop_duration = TRUE;
165 capture_opts->autostop_duration = get_positive_int(p,"autostop duration");
166 } else if (strcmp(autostoparg,"filesize") == 0) {
167 capture_opts->has_autostop_filesize = TRUE;
168 capture_opts->autostop_filesize = get_positive_int(p,"autostop filesize");
169 } else if (strcmp(autostoparg,"files") == 0) {
170 capture_opts->multi_files_on = TRUE;
171 capture_opts->has_autostop_files = TRUE;
172 capture_opts->autostop_files = get_positive_int(p,"autostop files");
176 *colonp = ':'; /* put the colon back */
181 * Given a string of the form "<ring buffer file>:<duration>", as might appear
182 * as an argument to a "-b" option, parse it and set the arguments in
183 * question. Return an indication of whether it succeeded or failed
187 get_ring_arguments(capture_options *capture_opts, const char *arg)
189 gchar *p = NULL, *colonp;
191 colonp = strchr(arg, ':');
199 * Skip over any white space (there probably won't be any, but
200 * as we allow it in the preferences file, we might as well
203 while (isspace((guchar)*p))
207 * Put the colon back, so if our caller uses, in an
208 * error message, the string they passed us, the message
215 if (strcmp(arg,"files") == 0) {
216 capture_opts->has_ring_num_files = TRUE;
217 capture_opts->ring_num_files = get_natural_int(p, "number of ring buffer files");
218 } else if (strcmp(arg,"filesize") == 0) {
219 capture_opts->has_autostop_filesize = TRUE;
220 capture_opts->autostop_filesize = get_positive_int(p, "ring buffer filesize");
221 } else if (strcmp(arg,"duration") == 0) {
222 capture_opts->has_file_duration = TRUE;
223 capture_opts->file_duration = get_positive_int(p, "ring buffer duration");
226 *colonp = ':'; /* put the colon back */
232 capture_opts_add_iface_opt(capture_options *capture_opts, const char *optarg)
239 gchar err_str[CAPTURE_PCAP_ERRBUF_SIZE];
240 gchar *cant_get_if_list_errstr;
244 * If the argument is a number, treat it as an index into the list
245 * of adapters, as printed by "tethereal -D".
247 * This should be OK on UNIX systems, as interfaces shouldn't have
248 * names that begin with digits. It can be useful on Windows, where
249 * more than one interface can have the same name.
251 adapter_index = strtol(optarg, &p, 10);
252 if (p != NULL && *p == '\0') {
253 if (adapter_index < 0) {
254 cmdarg_err("The specified adapter index is a negative number");
257 if (adapter_index > INT_MAX) {
258 cmdarg_err("The specified adapter index is too large (greater than %d)",
262 if (adapter_index == 0) {
263 cmdarg_err("there is no interface with that adapter index");
266 if_list = get_interface_list(&err, err_str);
267 if (if_list == NULL) {
270 case CANT_GET_INTERFACE_LIST:
271 cant_get_if_list_errstr =
272 cant_get_if_list_error_message(err_str);
273 cmdarg_err("%s", cant_get_if_list_errstr);
274 g_free(cant_get_if_list_errstr);
277 case NO_INTERFACES_FOUND:
278 cmdarg_err("There are no interfaces on which a capture can be done");
283 if_info = g_list_nth_data(if_list, adapter_index - 1);
284 if (if_info == NULL) {
285 cmdarg_err("there is no interface with that adapter index");
288 capture_opts->iface = g_strdup(if_info->name);
289 free_interface_list(if_list);
291 capture_opts->iface = g_strdup(optarg);
298 capture_opts_add_opt(capture_options *capture_opts, int opt, const char *optarg, gboolean *start_capture)
303 case 'a': /* autostop criteria */
304 if (set_autostop_criterion(capture_opts, optarg) == FALSE) {
305 cmdarg_err("Invalid or unknown -a flag \"%s\"", optarg);
309 case 'b': /* Ringbuffer option */
310 capture_opts->multi_files_on = TRUE;
311 if (get_ring_arguments(capture_opts, optarg) == FALSE) {
312 cmdarg_err("Invalid or unknown -b arg \"%s\"", optarg);
317 case 'B': /* Buffer size */
318 capture_opts->buffer_size = get_positive_int(optarg, "buffer size");
321 case 'c': /* Capture xxx packets */
322 capture_opts->has_autostop_packets = TRUE;
323 capture_opts->autostop_packets = get_positive_int(optarg, "packet count");
325 case 'f': /* capture filter */
326 if (capture_opts->cfilter)
327 g_free(capture_opts->cfilter);
328 capture_opts->cfilter = g_strdup(optarg);
330 case 'H': /* Hide capture info dialog box */
331 capture_opts->show_info = FALSE;
333 case 'i': /* Use interface xxx */
334 status = capture_opts_add_iface_opt(capture_opts, optarg);
339 case 'k': /* Start capture immediately */
340 *start_capture = TRUE;
342 /*case 'l':*/ /* Automatic scrolling in live capture mode */
343 case 'p': /* Don't capture in promiscuous mode */
344 capture_opts->promisc_mode = FALSE;
346 case 'Q': /* Quit after capture (just capture to file) */
347 capture_opts->quit_after_cap = TRUE;
348 *start_capture = TRUE; /*** -Q implies -k !! ***/
350 case 's': /* Set the snapshot (capture) length */
351 capture_opts->has_snaplen = TRUE;
352 capture_opts->snaplen = get_positive_int(optarg, "snapshot length");
354 case 'S': /* "Real-Time" mode: used for following file ala tail -f */
355 capture_opts->real_time_mode = TRUE;
357 case 'w': /* Write to capture file xxx */
358 #if defined _WIN32 && (GLIB_MAJOR_VERSION > 2 || (GLIB_MAJOR_VERSION == 2 && GLIB_MINOR_VERSION >= 6))
359 /* since GLib 2.6, we need to convert filenames to utf8 for Win32 */
360 capture_opts->save_file = g_locale_to_utf8(optarg, -1, NULL, NULL, NULL);
362 capture_opts->save_file = g_strdup(optarg);
364 status = capture_opts_output_to_pipe(capture_opts->save_file, &capture_opts->output_to_pipe);
367 case 'y': /* Set the pcap data link type */
368 #ifdef HAVE_PCAP_DATALINK_NAME_TO_VAL
369 capture_opts->linktype = linktype_name_to_val(optarg);
370 if (capture_opts->linktype == -1) {
371 cmdarg_err("The specified data link type \"%s\" isn't valid",
375 #else /* HAVE_PCAP_DATALINK_NAME_TO_VAL */
376 /* XXX - just treat it as a number */
377 capture_opts->linktype = get_natural_int(optarg, "data link type");
378 #endif /* HAVE_PCAP_DATALINK_NAME_TO_VAL */
381 /* the caller is responsible to send us only the right opt's */
382 g_assert_not_reached();
389 int capture_opts_list_link_layer_types(capture_options *capture_opts)
391 gchar err_str[CAPTURE_PCAP_ERRBUF_SIZE];
392 GList *lt_list, *lt_entry;
393 data_link_info_t *data_link_info;
395 /* Get the list of link-layer types for the capture device. */
396 lt_list = get_pcap_linktype_list(capture_opts->iface, err_str);
397 if (lt_list == NULL) {
398 if (err_str[0] != '\0') {
399 cmdarg_err("The list of data link types for the capture device \"%s\" could not be obtained (%s)."
400 "Please check to make sure you have sufficient permissions, and that\n"
401 "you have the proper interface or pipe specified.\n", capture_opts->iface, err_str);
403 cmdarg_err("The capture device \"%s\" has no data link types.", capture_opts->iface);
406 cmdarg_err_cont("Data link types (use option -y to set):");
407 for (lt_entry = lt_list; lt_entry != NULL;
408 lt_entry = g_list_next(lt_entry)) {
409 data_link_info = lt_entry->data;
410 cmdarg_err_cont(" %s", data_link_info->name);
411 if (data_link_info->description != NULL)
412 cmdarg_err_cont(" (%s)", data_link_info->description);
414 cmdarg_err_cont(" (not supported)");
417 free_pcap_linktype_list(lt_list);
423 int capture_opts_list_interfaces()
429 gchar err_str[CAPTURE_PCAP_ERRBUF_SIZE];
430 gchar *cant_get_if_list_errstr;
434 if_list = get_interface_list(&err, err_str);
435 if (if_list == NULL) {
437 case CANT_GET_INTERFACE_LIST:
438 cant_get_if_list_errstr = cant_get_if_list_error_message(err_str);
439 cmdarg_err("%s", cant_get_if_list_errstr);
440 g_free(cant_get_if_list_errstr);
443 case NO_INTERFACES_FOUND:
444 cmdarg_err("There are no interfaces on which a capture can be done");
450 i = 1; /* Interface id number */
451 for (if_entry = g_list_first(if_list); if_entry != NULL;
452 if_entry = g_list_next(if_entry)) {
453 if_info = if_entry->data;
454 printf("%d. %s", i++, if_info->name);
455 if (if_info->description != NULL)
456 printf(" (%s)", if_info->description);
459 free_interface_list(if_list);
465 void capture_opts_trim_snaplen(capture_options *capture_opts, int snaplen_min)
467 if (capture_opts->snaplen < 1)
468 capture_opts->snaplen = WTAP_MAX_PACKET_SIZE;
469 else if (capture_opts->snaplen < snaplen_min)
470 capture_opts->snaplen = snaplen_min;
474 void capture_opts_trim_ring_num_files(capture_options *capture_opts)
476 /* Check the value range of the ring_num_files parameter */
477 if (capture_opts->ring_num_files > RINGBUFFER_MAX_NUM_FILES)
478 capture_opts->ring_num_files = RINGBUFFER_MAX_NUM_FILES;
479 #if RINGBUFFER_MIN_NUM_FILES > 0
480 else if (capture_opts->ring_num_files < RINGBUFFER_MIN_NUM_FILES)
481 capture_opts->ring_num_files = RINGBUFFER_MIN_NUM_FILES;
486 gboolean capture_opts_trim_iface(capture_options *capture_opts, const char *capture_device)
491 gchar err_str[CAPTURE_PCAP_ERRBUF_SIZE];
492 gchar *cant_get_if_list_errstr;
495 /* Did the user specify an interface to use? */
496 if (capture_opts->iface == NULL) {
497 /* No - is a default specified in the preferences file? */
498 if (capture_device != NULL) {
500 capture_opts->iface = g_strdup(capture_device);
502 /* No - pick the first one from the list of interfaces. */
503 if_list = get_interface_list(&err, err_str);
504 if (if_list == NULL) {
507 case CANT_GET_INTERFACE_LIST:
508 cant_get_if_list_errstr = cant_get_if_list_error_message(err_str);
509 cmdarg_err("%s", cant_get_if_list_errstr);
510 g_free(cant_get_if_list_errstr);
513 case NO_INTERFACES_FOUND:
514 cmdarg_err("There are no interfaces on which a capture can be done");
519 if_info = if_list->data; /* first interface */
520 capture_opts->iface = g_strdup(if_info->name);
521 free_interface_list(if_list);
531 #define S_IFIFO _S_IFIFO
534 #define S_ISFIFO(mode) (((mode) & S_IFMT) == S_IFIFO)
537 /* copied from filesystem.c */
538 static int capture_opts_test_for_fifo(const char *path)
542 if (eth_stat(path, &statb) < 0)
545 if (S_ISFIFO(statb.st_mode))
551 static gboolean capture_opts_output_to_pipe(const char *save_file, gboolean *is_pipe)
555 if (save_file != NULL) {
556 /* We're writing to a capture file. */
557 if (strcmp(save_file, "-") == 0) {
558 /* Writing to stdout. */
559 /* XXX - should we check whether it's a pipe? It's arguably
560 silly to do "-w - >output_file" rather than "-w output_file",
561 but by not checking we might be violating the Principle Of
562 Least Astonishment. */
565 /* not a capture file, test for a FIFO (aka named pipe) */
566 err = capture_opts_test_for_fifo(save_file);
569 case ENOENT: /* it doesn't exist, so we'll be creating it,
570 and it won't be a FIFO */
571 case 0: /* found it, but it's not a FIFO */
574 case ESPIPE: /* it is a FIFO */
578 default: /* couldn't stat it */
579 cmdarg_err("Error testing whether capture file is a pipe: %s",
591 #endif /* HAVE_LIBPCAP */