capture_opts.c

   1 /* capture_opts.c
   2  * Routines for capture options setting
   3  *
   4  * Wireshark - Network traffic analyzer
   5  * By Gerald Combs <gerald@wireshark.org>
   6  * Copyright 1998 Gerald Combs
   7  *
   8  * This program is free software; you can redistribute it and/or
   9  * modify it under the terms of the GNU General Public License
  10  * as published by the Free Software Foundation; either version 2
  11  * of the License, or (at your option) any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * along with this program; if not, write to the Free Software
  20  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  21  */
  22
  23 #include <config.h>
  24
  25 #include <stdio.h>
  26 #include <stdlib.h>
  27
  28 #ifdef HAVE_LIBPCAP
  29
  30 #include <string.h>
  31
  32 #ifdef HAVE_UNISTD_H
  33 #include <unistd.h>
  34 #endif
  35
  36 #include <glib.h>
  37
  38 #include <epan/packet.h>
  39 #include <epan/prefs.h>
  40
  41 #include "capture_opts.h"
  42 #include "ringbuffer.h"
  43
  44 #include <wsutil/clopts_common.h>
  45 #include <wsutil/cmdarg_err.h>
  46 #include <wsutil/file_util.h>
  47
  48 #include "caputils/capture_ifinfo.h"
  49 #include "caputils/capture-pcap-util.h"
  50
  51 static gboolean capture_opts_output_to_pipe(const char *save_file, gboolean *is_pipe);
  52
  53
  54 void
  55 capture_opts_init(capture_options *capture_opts)
  56 {
  57     capture_opts->ifaces                          = g_array_new(FALSE, FALSE, sizeof(interface_options));
  58     capture_opts->all_ifaces                      = g_array_new(FALSE, FALSE, sizeof(interface_t));
  59     capture_opts->num_selected                    = 0;
  60     capture_opts->default_options.name            = NULL;
  61     capture_opts->default_options.descr           = NULL;
  62     capture_opts->default_options.cfilter         = NULL;
  63     capture_opts->default_options.has_snaplen     = FALSE;
  64     capture_opts->default_options.snaplen         = WTAP_MAX_PACKET_SIZE;
  65     capture_opts->default_options.linktype        = -1; /* use interface default */
  66     capture_opts->default_options.promisc_mode    = TRUE;
  67     capture_opts->default_options.if_type         = IF_WIRED;
  68 #ifdef HAVE_EXTCAP
  69     capture_opts->default_options.extcap          = NULL;
  70     capture_opts->default_options.extcap_fifo     = NULL;
  71     capture_opts->default_options.extcap_args     = NULL;
  72     capture_opts->default_options.extcap_pid      = INVALID_EXTCAP_PID;
  73 #endif
  74 #ifdef CAN_SET_CAPTURE_BUFFER_SIZE
  75     capture_opts->default_options.buffer_size     = DEFAULT_CAPTURE_BUFFER_SIZE;
  76 #endif
  77     capture_opts->default_options.monitor_mode    = FALSE;
  78 #ifdef HAVE_PCAP_REMOTE
  79     capture_opts->default_options.src_type        = CAPTURE_IFLOCAL;
  80     capture_opts->default_options.remote_host     = NULL;
  81     capture_opts->default_options.remote_port     = NULL;
  82     capture_opts->default_options.auth_type       = CAPTURE_AUTH_NULL;
  83     capture_opts->default_options.auth_username   = NULL;
  84     capture_opts->default_options.auth_password   = NULL;
  85     capture_opts->default_options.datatx_udp      = FALSE;
  86     capture_opts->default_options.nocap_rpcap     = TRUE;
  87     capture_opts->default_options.nocap_local     = FALSE;
  88 #endif
  89 #ifdef HAVE_PCAP_SETSAMPLING
  90     capture_opts->default_options.sampling_method = CAPTURE_SAMP_NONE;
  91     capture_opts->default_options.sampling_param  = 0;
  92 #endif
  93     capture_opts->saving_to_file                  = FALSE;
  94     capture_opts->save_file                       = NULL;
  95     capture_opts->group_read_access               = FALSE;
  96 #ifdef PCAP_NG_DEFAULT
  97     capture_opts->use_pcapng                      = TRUE;             /* Save as pcap-ng by default */
  98 #else
  99     capture_opts->use_pcapng                      = FALSE;            /* Save as pcap by default */
 100 #endif
 101     capture_opts->real_time_mode                  = TRUE;
 102     capture_opts->show_info                       = TRUE;
 103     capture_opts->quit_after_cap                  = getenv("WIRESHARK_QUIT_AFTER_CAPTURE") ? TRUE : FALSE;
 104     capture_opts->restart                         = FALSE;
 105     capture_opts->orig_save_file                  = NULL;
 106
 107     capture_opts->multi_files_on                  = FALSE;
 108     capture_opts->has_file_duration               = FALSE;
 109     capture_opts->file_duration                   = 60;               /* 1 min */
 110     capture_opts->has_ring_num_files              = FALSE;
 111     capture_opts->ring_num_files                  = RINGBUFFER_MIN_NUM_FILES;
 112
 113     capture_opts->has_autostop_files              = FALSE;
 114     capture_opts->autostop_files                  = 1;
 115     capture_opts->has_autostop_packets            = FALSE;
 116     capture_opts->autostop_packets                = 0;
 117     capture_opts->has_autostop_filesize           = FALSE;
 118     capture_opts->autostop_filesize               = 1000;             /* 1 MB */
 119     capture_opts->has_autostop_duration           = FALSE;
 120     capture_opts->autostop_duration               = 60;               /* 1 min */
 121     capture_opts->capture_comment                 = NULL;
 122
 123     capture_opts->output_to_pipe                  = FALSE;
 124     capture_opts->capture_child                   = FALSE;
 125 }
 126
 127
 128 /* log content of capture_opts */
 129 void
 130 capture_opts_log(const char *log_domain, GLogLevelFlags log_level, capture_options *capture_opts) {
 131     guint i;
 132
 133     g_log(log_domain, log_level, "CAPTURE OPTIONS     :");
 134
 135     for (i = 0; i < capture_opts->ifaces->len; i++) {
 136         interface_options interface_opts;
 137
 138         interface_opts = g_array_index(capture_opts->ifaces, interface_options, i);
 139         g_log(log_domain, log_level, "Interface name[%02d]  : %s", i, interface_opts.name ? interface_opts.name : "(unspecified)");
 140         g_log(log_domain, log_level, "Interface description[%02d] : %s", i, interface_opts.descr ? interface_opts.descr : "(unspecified)");
 141         g_log(log_domain, log_level, "Console display name[%02d]: %s", i, interface_opts.console_display_name ? interface_opts.console_display_name : "(unspecified)");
 142         g_log(log_domain, log_level, "Capture filter[%02d]  : %s", i, interface_opts.cfilter ? interface_opts.cfilter : "(unspecified)");
 143         g_log(log_domain, log_level, "Snap length[%02d] (%u) : %d", i, interface_opts.has_snaplen, interface_opts.snaplen);
 144         g_log(log_domain, log_level, "Link Type[%02d]       : %d", i, interface_opts.linktype);
 145         g_log(log_domain, log_level, "Promiscuous Mode[%02d]: %s", i, interface_opts.promisc_mode?"TRUE":"FALSE");
 146 #ifdef HAVE_EXTCAP
 147         g_log(log_domain, log_level, "Extcap[%02d]          : %s", i, interface_opts.extcap ? interface_opts.extcap : "(unspecified)");
 148         g_log(log_domain, log_level, "Extcap FIFO[%02d]     : %s", i, interface_opts.extcap_fifo ? interface_opts.extcap_fifo : "(unspecified)");
 149         g_log(log_domain, log_level, "Extcap PID[%02d]      : %d", i, interface_opts.extcap_pid);
 150 #endif
 151 #ifdef CAN_SET_CAPTURE_BUFFER_SIZE
 152         g_log(log_domain, log_level, "Buffer size[%02d]     : %d (MB)", i, interface_opts.buffer_size);
 153 #endif
 154         g_log(log_domain, log_level, "Monitor Mode[%02d]    : %s", i, interface_opts.monitor_mode?"TRUE":"FALSE");
 155 #ifdef HAVE_PCAP_REMOTE
 156         g_log(log_domain, log_level, "Capture source[%02d]  : %s", i,
 157             interface_opts.src_type == CAPTURE_IFLOCAL ? "Local interface" :
 158             interface_opts.src_type == CAPTURE_IFREMOTE ? "Remote interface" :
 159             "Unknown");
 160         if (interface_opts.src_type == CAPTURE_IFREMOTE) {
 161             g_log(log_domain, log_level, "Remote host[%02d]     : %s", i, interface_opts.remote_host ? interface_opts.remote_host : "(unspecified)");
 162             g_log(log_domain, log_level, "Remote port[%02d]     : %s", i, interface_opts.remote_port ? interface_opts.remote_port : "(unspecified)");
 163         }
 164         g_log(log_domain, log_level, "Authentication[%02d]  : %s", i,
 165             interface_opts.auth_type == CAPTURE_AUTH_NULL ? "Null" :
 166             interface_opts.auth_type == CAPTURE_AUTH_PWD ? "By username/password" :
 167             "Unknown");
 168         if (interface_opts.auth_type == CAPTURE_AUTH_PWD) {
 169             g_log(log_domain, log_level, "Auth username[%02d]   : %s", i, interface_opts.auth_username ? interface_opts.auth_username : "(unspecified)");
 170             g_log(log_domain, log_level, "Auth password[%02d]   : <hidden>", i);
 171         }
 172         g_log(log_domain, log_level, "UDP data tfer[%02d]   : %u", i, interface_opts.datatx_udp);
 173         g_log(log_domain, log_level, "No cap. RPCAP[%02d]   : %u", i, interface_opts.nocap_rpcap);
 174         g_log(log_domain, log_level, "No cap. local[%02d]   : %u", i, interface_opts.nocap_local);
 175 #endif
 176 #ifdef HAVE_PCAP_SETSAMPLING
 177         g_log(log_domain, log_level, "Sampling meth.[%02d]  : %d", i, interface_opts.sampling_method);
 178         g_log(log_domain, log_level, "Sampling param.[%02d] : %d", i, interface_opts.sampling_param);
 179 #endif
 180     }
 181     g_log(log_domain, log_level, "Interface name[df]  : %s", capture_opts->default_options.name ? capture_opts->default_options.name : "(unspecified)");
 182     g_log(log_domain, log_level, "Interface Descr[df] : %s", capture_opts->default_options.descr ? capture_opts->default_options.descr : "(unspecified)");
 183     g_log(log_domain, log_level, "Capture filter[df]  : %s", capture_opts->default_options.cfilter ? capture_opts->default_options.cfilter : "(unspecified)");
 184     g_log(log_domain, log_level, "Snap length[df] (%u) : %d", capture_opts->default_options.has_snaplen, capture_opts->default_options.snaplen);
 185     g_log(log_domain, log_level, "Link Type[df]       : %d", capture_opts->default_options.linktype);
 186     g_log(log_domain, log_level, "Promiscuous Mode[df]: %s", capture_opts->default_options.promisc_mode?"TRUE":"FALSE");
 187 #ifdef HAVE_EXTCAP
 188     g_log(log_domain, log_level, "Extcap[df]          : %s", capture_opts->default_options.extcap ? capture_opts->default_options.extcap : "(unspecified)");
 189     g_log(log_domain, log_level, "Extcap FIFO[df]     : %s", capture_opts->default_options.extcap_fifo ? capture_opts->default_options.extcap_fifo : "(unspecified)");
 190 #endif
 191 #ifdef CAN_SET_CAPTURE_BUFFER_SIZE
 192     g_log(log_domain, log_level, "Buffer size[df]     : %d (MB)", capture_opts->default_options.buffer_size);
 193 #endif
 194     g_log(log_domain, log_level, "Monitor Mode[df]    : %s", capture_opts->default_options.monitor_mode?"TRUE":"FALSE");
 195 #ifdef HAVE_PCAP_REMOTE
 196     g_log(log_domain, log_level, "Capture source[df]  : %s",
 197         capture_opts->default_options.src_type == CAPTURE_IFLOCAL ? "Local interface" :
 198         capture_opts->default_options.src_type == CAPTURE_IFREMOTE ? "Remote interface" :
 199         "Unknown");
 200     if (capture_opts->default_options.src_type == CAPTURE_IFREMOTE) {
 201         g_log(log_domain, log_level, "Remote host[df]     : %s", capture_opts->default_options.remote_host ? capture_opts->default_options.remote_host : "(unspecified)");
 202         g_log(log_domain, log_level, "Remote port[df]     : %s", capture_opts->default_options.remote_port ? capture_opts->default_options.remote_port : "(unspecified)");
 203     }
 204     g_log(log_domain, log_level, "Authentication[df]  : %s",
 205         capture_opts->default_options.auth_type == CAPTURE_AUTH_NULL ? "Null" :
 206         capture_opts->default_options.auth_type == CAPTURE_AUTH_PWD ? "By username/password" :
 207         "Unknown");
 208     if (capture_opts->default_options.auth_type == CAPTURE_AUTH_PWD) {
 209         g_log(log_domain, log_level, "Auth username[df]   : %s", capture_opts->default_options.auth_username ? capture_opts->default_options.auth_username : "(unspecified)");
 210         g_log(log_domain, log_level, "Auth password[df]   : <hidden>");
 211     }
 212     g_log(log_domain, log_level, "UDP data tfer[df]   : %u", capture_opts->default_options.datatx_udp);
 213     g_log(log_domain, log_level, "No cap. RPCAP[df]   : %u", capture_opts->default_options.nocap_rpcap);
 214     g_log(log_domain, log_level, "No cap. local[df]   : %u", capture_opts->default_options.nocap_local);
 215 #endif
 216 #ifdef HAVE_PCAP_SETSAMPLING
 217     g_log(log_domain, log_level, "Sampling meth. [df] : %d", capture_opts->default_options.sampling_method);
 218     g_log(log_domain, log_level, "Sampling param.[df] : %d", capture_opts->default_options.sampling_param);
 219 #endif
 220     g_log(log_domain, log_level, "SavingToFile        : %u", capture_opts->saving_to_file);
 221     g_log(log_domain, log_level, "SaveFile            : %s", (capture_opts->save_file) ? capture_opts->save_file : "");
 222     g_log(log_domain, log_level, "GroupReadAccess     : %u", capture_opts->group_read_access);
 223     g_log(log_domain, log_level, "Fileformat          : %s", (capture_opts->use_pcapng) ? "PCAPNG" : "PCAP");
 224     g_log(log_domain, log_level, "RealTimeMode        : %u", capture_opts->real_time_mode);
 225     g_log(log_domain, log_level, "ShowInfo            : %u", capture_opts->show_info);
 226     g_log(log_domain, log_level, "QuitAfterCap        : %u", capture_opts->quit_after_cap);
 227
 228     g_log(log_domain, log_level, "MultiFilesOn        : %u", capture_opts->multi_files_on);
 229     g_log(log_domain, log_level, "FileDuration    (%u) : %u", capture_opts->has_file_duration, capture_opts->file_duration);
 230     g_log(log_domain, log_level, "RingNumFiles    (%u) : %u", capture_opts->has_ring_num_files, capture_opts->ring_num_files);
 231
 232     g_log(log_domain, log_level, "AutostopFiles   (%u) : %u", capture_opts->has_autostop_files, capture_opts->autostop_files);
 233     g_log(log_domain, log_level, "AutostopPackets (%u) : %u", capture_opts->has_autostop_packets, capture_opts->autostop_packets);
 234     g_log(log_domain, log_level, "AutostopFilesize(%u) : %u (KB)", capture_opts->has_autostop_filesize, capture_opts->autostop_filesize);
 235     g_log(log_domain, log_level, "AutostopDuration(%u) : %u", capture_opts->has_autostop_duration, capture_opts->autostop_duration);
 236 }
 237
 238 /*
 239  * Given a string of the form "<autostop criterion>:<value>", as might appear
 240  * as an argument to a "-a" option, parse it and set the criterion in
 241  * question.  Return an indication of whether it succeeded or failed
 242  * in some fashion.
 243  */
 244 static gboolean
 245 set_autostop_criterion(capture_options *capture_opts, const char *autostoparg)
 246 {
 247     gchar *p, *colonp;
 248
 249     colonp = strchr(autostoparg, ':');
 250     if (colonp == NULL)
 251         return FALSE;
 252
 253     p = colonp;
 254     *p++ = '\0';
 255
 256     /*
 257      * Skip over any white space (there probably won't be any, but
 258      * as we allow it in the preferences file, we might as well
 259      * allow it here).
 260      */
 261     while (g_ascii_isspace(*p))
 262         p++;
 263     if (*p == '\0') {
 264         /*
 265          * Put the colon back, so if our caller uses, in an
 266          * error message, the string they passed us, the message
 267          * looks correct.
 268          */
 269         *colonp = ':';
 270         return FALSE;
 271     }
 272     if (strcmp(autostoparg,"duration") == 0) {
 273         capture_opts->has_autostop_duration = TRUE;
 274         capture_opts->autostop_duration = get_positive_int(p,"autostop duration");
 275     } else if (strcmp(autostoparg,"filesize") == 0) {
 276         capture_opts->has_autostop_filesize = TRUE;
 277         capture_opts->autostop_filesize = get_positive_int(p,"autostop filesize");
 278     } else if (strcmp(autostoparg,"files") == 0) {
 279         capture_opts->multi_files_on = TRUE;
 280         capture_opts->has_autostop_files = TRUE;
 281         capture_opts->autostop_files = get_positive_int(p,"autostop files");
 282     } else {
 283         return FALSE;
 284     }
 285     *colonp = ':'; /* put the colon back */
 286     return TRUE;
 287 }
 288
 289 /*
 290  * Given a string of the form "<ring buffer file>:<duration>", as might appear
 291  * as an argument to a "-b" option, parse it and set the arguments in
 292  * question.  Return an indication of whether it succeeded or failed
 293  * in some fashion.
 294  */
 295 static gboolean
 296 get_ring_arguments(capture_options *capture_opts, const char *arg)
 297 {
 298     gchar *p = NULL, *colonp;
 299
 300     colonp = strchr(arg, ':');
 301     if (colonp == NULL)
 302         return FALSE;
 303
 304     p = colonp;
 305     *p++ = '\0';
 306
 307     /*
 308      * Skip over any white space (there probably won't be any, but
 309      * as we allow it in the preferences file, we might as well
 310      * allow it here).
 311      */
 312     while (g_ascii_isspace(*p))
 313         p++;
 314     if (*p == '\0') {
 315         /*
 316          * Put the colon back, so if our caller uses, in an
 317          * error message, the string they passed us, the message
 318          * looks correct.
 319          */
 320         *colonp = ':';
 321         return FALSE;
 322     }
 323
 324     if (strcmp(arg,"files") == 0) {
 325         capture_opts->has_ring_num_files = TRUE;
 326         capture_opts->ring_num_files = get_positive_int(p, "number of ring buffer files");
 327     } else if (strcmp(arg,"filesize") == 0) {
 328         capture_opts->has_autostop_filesize = TRUE;
 329         capture_opts->autostop_filesize = get_positive_int(p, "ring buffer filesize");
 330     } else if (strcmp(arg,"duration") == 0) {
 331         capture_opts->has_file_duration = TRUE;
 332         capture_opts->file_duration = get_positive_int(p, "ring buffer duration");
 333     }
 334
 335     *colonp = ':';    /* put the colon back */
 336     return TRUE;
 337 }
 338
 339 #ifdef HAVE_PCAP_SETSAMPLING
 340 /*
 341  * Given a string of the form "<sampling type>:<value>", as might appear
 342  * as an argument to a "-m" option, parse it and set the arguments in
 343  * question.  Return an indication of whether it succeeded or failed
 344  * in some fashion.
 345  */
 346 static gboolean
 347 get_sampling_arguments(capture_options *capture_opts, const char *arg)
 348 {
 349     gchar *p = NULL, *colonp;
 350
 351     colonp = strchr(arg, ':');
 352     if (colonp == NULL)
 353         return FALSE;
 354
 355     p = colonp;
 356     *p++ = '\0';
 357
 358     while (g_ascii_isspace(*p))
 359         p++;
 360     if (*p == '\0') {
 361         *colonp = ':';
 362         return FALSE;
 363     }
 364
 365     if (strcmp(arg, "count") == 0) {
 366         if (capture_opts->ifaces->len > 0) {
 367             interface_options interface_opts;
 368
 369             interface_opts = g_array_index(capture_opts->ifaces, interface_options, capture_opts->ifaces->len - 1);
 370             capture_opts->ifaces = g_array_remove_index(capture_opts->ifaces, capture_opts->ifaces->len - 1);
 371             interface_opts.sampling_method = CAPTURE_SAMP_BY_COUNT;
 372             interface_opts.sampling_param = get_positive_int(p, "sampling count");
 373             g_array_append_val(capture_opts->ifaces, interface_opts);
 374         } else {
 375             capture_opts->default_options.sampling_method = CAPTURE_SAMP_BY_COUNT;
 376             capture_opts->default_options.sampling_param = get_positive_int(p, "sampling count");
 377         }
 378     } else if (strcmp(arg, "timer") == 0) {
 379         if (capture_opts->ifaces->len > 0) {
 380             interface_options interface_opts;
 381
 382             interface_opts = g_array_index(capture_opts->ifaces, interface_options, capture_opts->ifaces->len - 1);
 383             capture_opts->ifaces = g_array_remove_index(capture_opts->ifaces, capture_opts->ifaces->len - 1);
 384             interface_opts.sampling_method = CAPTURE_SAMP_BY_TIMER;
 385             interface_opts.sampling_param = get_positive_int(p, "sampling timer");
 386             g_array_append_val(capture_opts->ifaces, interface_opts);
 387         } else {
 388             capture_opts->default_options.sampling_method = CAPTURE_SAMP_BY_TIMER;
 389             capture_opts->default_options.sampling_param = get_positive_int(p, "sampling timer");
 390         }
 391     }
 392     *colonp = ':';
 393     return TRUE;
 394 }
 395 #endif
 396
 397 #ifdef HAVE_PCAP_REMOTE
 398 /*
 399  * Given a string of the form "<username>:<password>", as might appear
 400  * as an argument to a "-A" option, parse it and set the arguments in
 401  * question.  Return an indication of whether it succeeded or failed
 402  * in some fashion.
 403  */
 404 static gboolean
 405 get_auth_arguments(capture_options *capture_opts, const char *arg)
 406 {
 407     gchar *p = NULL, *colonp;
 408
 409     colonp = strchr(arg, ':');
 410     if (colonp == NULL)
 411         return FALSE;
 412
 413     p = colonp;
 414     *p++ = '\0';
 415
 416     while (g_ascii_isspace(*p))
 417         p++;
 418
 419     if (capture_opts->ifaces->len > 0) {
 420         interface_options interface_opts;
 421
 422         interface_opts = g_array_index(capture_opts->ifaces, interface_options, capture_opts->ifaces->len - 1);
 423         capture_opts->ifaces = g_array_remove_index(capture_opts->ifaces, capture_opts->ifaces->len - 1);
 424         interface_opts.auth_type = CAPTURE_AUTH_PWD;
 425         interface_opts.auth_username = g_strdup(arg);
 426         interface_opts.auth_password = g_strdup(p);
 427         g_array_append_val(capture_opts->ifaces, interface_opts);
 428     } else {
 429         capture_opts->default_options.auth_type = CAPTURE_AUTH_PWD;
 430         capture_opts->default_options.auth_username = g_strdup(arg);
 431         capture_opts->default_options.auth_password = g_strdup(p);
 432     }
 433     *colonp = ':';
 434     return TRUE;
 435 }
 436 #endif
 437
 438 static int
 439 capture_opts_add_iface_opt(capture_options *capture_opts, const char *optarg_str_p)
 440 {
 441     long        adapter_index;
 442     char        *p;
 443     GList       *if_list;
 444     if_info_t   *if_info;
 445     int         err;
 446     gchar       *err_str;
 447     interface_options interface_opts;
 448
 449     /*
 450      * If the argument is a number, treat it as an index into the list
 451      * of adapters, as printed by "tshark -D".
 452      *
 453      * This should be OK on UNIX systems, as interfaces shouldn't have
 454      * names that begin with digits.  It can be useful on Windows, where
 455      * more than one interface can have the same name.
 456      */
 457     adapter_index = strtol(optarg_str_p, &p, 10);
 458     if (p != NULL && *p == '\0') {
 459         if (adapter_index < 0) {
 460             cmdarg_err("The specified adapter index is a negative number");
 461             return 1;
 462         }
 463         if (adapter_index > INT_MAX) {
 464             cmdarg_err("The specified adapter index is too large (greater than %d)",
 465                        INT_MAX);
 466             return 1;
 467         }
 468         if (adapter_index == 0) {
 469             cmdarg_err("There is no interface with that adapter index");
 470             return 1;
 471         }
 472         if_list = capture_interface_list(&err, &err_str, NULL);
 473         if (if_list == NULL) {
 474             if (err == 0)
 475                 cmdarg_err("There are no interfaces on which a capture can be done");
 476             else {
 477                 cmdarg_err("%s", err_str);
 478                 g_free(err_str);
 479             }
 480             return 2;
 481         }
 482         if_info = (if_info_t *)g_list_nth_data(if_list, (int)(adapter_index - 1));
 483         if (if_info == NULL) {
 484             cmdarg_err("There is no interface with that adapter index");
 485             return 1;
 486         }
 487         interface_opts.name = g_strdup(if_info->name);
 488         if (if_info->friendly_name != NULL) {
 489             /*
 490              * We have a friendly name for the interface, so display that
 491              * instead of the interface name/guid.
 492              *
 493              * XXX - on UN*X, the interface name is not quite so ugly,
 494              * and might be more familiar to users; display them both?
 495              */
 496             interface_opts.console_display_name = g_strdup(if_info->friendly_name);
 497         } else {
 498             /* fallback to the interface name */
 499             interface_opts.console_display_name = g_strdup(if_info->name);
 500         }
 501         interface_opts.if_type = if_info->type;
 502 #ifdef HAVE_EXTCAP
 503         interface_opts.extcap = g_strdup(if_info->extcap);
 504 #endif
 505         free_interface_list(if_list);
 506     } else if (capture_opts->capture_child) {
 507         /* In Wireshark capture child mode, thus proper device name is supplied. */
 508         /* No need for trying to match it for friendly names. */
 509         interface_opts.name = g_strdup(optarg_str_p);
 510         interface_opts.console_display_name = g_strdup(optarg_str_p);
 511         interface_opts.if_type = capture_opts->default_options.if_type;
 512 #ifdef HAVE_EXTCAP
 513         interface_opts.extcap = g_strdup(capture_opts->default_options.extcap);
 514 #endif
 515     } else {
 516         /*
 517          * Retrieve the interface list so that we can search for the
 518          * specified option amongst both the interface names and the
 519          * friendly names and so that we find the friendly name even
 520          * if an interface name was specified.
 521          *
 522          * If we can't get the list, just use the specified option as
 523          * the interface name, so that the user can try specifying an
 524          * interface explicitly for testing purposes.
 525          */
 526         if_list = capture_interface_list(&err, NULL, NULL);
 527         if (if_list != NULL) {
 528             /* try and do an exact match (case insensitive) */
 529             GList   *if_entry;
 530             gboolean matched;
 531
 532             matched = FALSE;
 533             for (if_entry = g_list_first(if_list); if_entry != NULL;
 534                  if_entry = g_list_next(if_entry))
 535             {
 536                 if_info = (if_info_t *)if_entry->data;
 537                 /* exact name check */
 538                 if (g_ascii_strcasecmp(if_info->name, optarg_str_p) == 0) {
 539                     /* exact match on the interface name, use that for displaying etc */
 540                     interface_opts.name = g_strdup(if_info->name);
 541
 542                     if (if_info->friendly_name != NULL) {
 543                         /*
 544                          * If we have a friendly name, use that for the
 545                          * console display name, as it is the basis for
 546                          * the auto generated temp filename.
 547                          */
 548                         interface_opts.console_display_name = g_strdup(if_info->friendly_name);
 549                     } else {
 550                         interface_opts.console_display_name = g_strdup(if_info->name);
 551                     }
 552                     interface_opts.if_type = if_info->type;
 553 #ifdef HAVE_EXTCAP
 554                     interface_opts.extcap = g_strdup(if_info->extcap);
 555 #endif
 556                     matched = TRUE;
 557                     break;
 558                 }
 559
 560                 /* exact friendly name check */
 561                 if (if_info->friendly_name != NULL &&
 562                     g_ascii_strcasecmp(if_info->friendly_name, optarg_str_p) == 0) {
 563                     /* exact match - use the friendly name for display */
 564                     interface_opts.name = g_strdup(if_info->name);
 565                     interface_opts.console_display_name = g_strdup(if_info->friendly_name);
 566                     interface_opts.if_type = if_info->type;
 567 #ifdef HAVE_EXTCAP
 568                     interface_opts.extcap = g_strdup(if_info->extcap);
 569 #endif
 570                     matched = TRUE;
 571                     break;
 572                 }
 573             }
 574
 575             /* didn't find, attempt a case insensitive prefix match of the friendly name*/
 576             if (!matched) {
 577                 size_t prefix_length;
 578
 579                 prefix_length = strlen(optarg_str_p);
 580                 for (if_entry = g_list_first(if_list); if_entry != NULL;
 581                      if_entry = g_list_next(if_entry))
 582                 {
 583                     if_info = (if_info_t *)if_entry->data;
 584
 585                     if (if_info->friendly_name != NULL &&
 586                         g_ascii_strncasecmp(if_info->friendly_name, optarg_str_p, prefix_length) == 0) {
 587                         /* prefix match - use the friendly name for display */
 588                         interface_opts.name = g_strdup(if_info->name);
 589                         interface_opts.console_display_name = g_strdup(if_info->friendly_name);
 590                         interface_opts.if_type = if_info->type;
 591 #ifdef HAVE_EXTCAP
 592                         interface_opts.extcap = g_strdup(if_info->extcap);
 593 #endif
 594                         matched = TRUE;
 595                         break;
 596                     }
 597                 }
 598             }
 599             if (!matched) {
 600                 /*
 601                  * We didn't find the interface in the list; just use
 602                  * the specified name, so that, for example, if an
 603                  * interface doesn't show up in the list for some
 604                  * reason, the user can try specifying it explicitly
 605                  * for testing purposes.
 606                  */
 607                 interface_opts.name = g_strdup(optarg_str_p);
 608                 interface_opts.console_display_name = g_strdup(optarg_str_p);
 609                 interface_opts.if_type = capture_opts->default_options.if_type;
 610 #ifdef HAVE_EXTCAP
 611                 interface_opts.extcap = g_strdup(capture_opts->default_options.extcap);
 612 #endif
 613             }
 614             free_interface_list(if_list);
 615         } else {
 616             interface_opts.name = g_strdup(optarg_str_p);
 617             interface_opts.console_display_name = g_strdup(optarg_str_p);
 618             interface_opts.if_type = capture_opts->default_options.if_type;
 619 #ifdef HAVE_EXTCAP
 620             interface_opts.extcap = g_strdup(capture_opts->default_options.extcap);
 621 #endif
 622         }
 623     }
 624
 625     /*  We don't set iface_descr here because doing so requires
 626      *  capture_ui_utils.c which requires epan/prefs.c which is
 627      *  probably a bit too much dependency for here...
 628      */
 629     interface_opts.descr = g_strdup(capture_opts->default_options.descr);
 630     interface_opts.cfilter = g_strdup(capture_opts->default_options.cfilter);
 631     interface_opts.snaplen = capture_opts->default_options.snaplen;
 632     interface_opts.has_snaplen = capture_opts->default_options.has_snaplen;
 633     interface_opts.linktype = capture_opts->default_options.linktype;
 634     interface_opts.promisc_mode = capture_opts->default_options.promisc_mode;
 635 #ifdef HAVE_EXTCAP
 636     interface_opts.extcap_fifo = g_strdup(capture_opts->default_options.extcap_fifo);
 637     interface_opts.extcap_args = NULL;
 638     interface_opts.extcap_pid = INVALID_EXTCAP_PID;
 639 #endif
 640 #ifdef CAN_SET_CAPTURE_BUFFER_SIZE
 641     interface_opts.buffer_size = capture_opts->default_options.buffer_size;
 642 #endif
 643     interface_opts.monitor_mode = capture_opts->default_options.monitor_mode;
 644 #ifdef HAVE_PCAP_REMOTE
 645     interface_opts.src_type = capture_opts->default_options.src_type;
 646     interface_opts.remote_host = g_strdup(capture_opts->default_options.remote_host);
 647     interface_opts.remote_port = g_strdup(capture_opts->default_options.remote_port);
 648     interface_opts.auth_type = capture_opts->default_options.auth_type;
 649     interface_opts.auth_username = g_strdup(capture_opts->default_options.auth_username);
 650     interface_opts.auth_password = g_strdup(capture_opts->default_options.auth_password);
 651     interface_opts.datatx_udp = capture_opts->default_options.datatx_udp;
 652     interface_opts.nocap_rpcap = capture_opts->default_options.nocap_rpcap;
 653     interface_opts.nocap_local = capture_opts->default_options.nocap_local;
 654 #endif
 655 #ifdef HAVE_PCAP_SETSAMPLING
 656     interface_opts.sampling_method = capture_opts->default_options.sampling_method;
 657     interface_opts.sampling_param  = capture_opts->default_options.sampling_param;
 658 #endif
 659
 660     g_array_append_val(capture_opts->ifaces, interface_opts);
 661
 662     return 0;
 663 }
 664
 665
 666 int
 667 capture_opts_add_opt(capture_options *capture_opts, int opt, const char *optarg_str_p, gboolean *start_capture)
 668 {
 669     int status, snaplen;
 670
 671     switch(opt) {
 672     case LONGOPT_NUM_CAP_COMMENT:  /* capture comment */
 673         if (capture_opts->capture_comment) {
 674             cmdarg_err("--capture-comment can be set only once per file");
 675             return 1;
 676         }
 677         capture_opts->capture_comment = g_strdup(optarg_str_p);
 678         break;
 679     case 'a':        /* autostop criteria */
 680         if (set_autostop_criterion(capture_opts, optarg_str_p) == FALSE) {
 681             cmdarg_err("Invalid or unknown -a flag \"%s\"", optarg_str_p);
 682             return 1;
 683         }
 684         break;
 685 #ifdef HAVE_PCAP_REMOTE
 686     case 'A':
 687         if (get_auth_arguments(capture_opts, optarg_str_p) == FALSE) {
 688             cmdarg_err("Invalid or unknown -A arg \"%s\"", optarg_str_p);
 689             return 1;
 690         }
 691         break;
 692 #endif
 693     case 'b':        /* Ringbuffer option */
 694         capture_opts->multi_files_on = TRUE;
 695         if (get_ring_arguments(capture_opts, optarg_str_p) == FALSE) {
 696             cmdarg_err("Invalid or unknown -b arg \"%s\"", optarg_str_p);
 697             return 1;
 698         }
 699         break;
 700 #ifdef CAN_SET_CAPTURE_BUFFER_SIZE
 701     case 'B':        /* Buffer size */
 702         if (capture_opts->ifaces->len > 0) {
 703             interface_options interface_opts;
 704
 705             interface_opts = g_array_index(capture_opts->ifaces, interface_options, capture_opts->ifaces->len - 1);
 706             capture_opts->ifaces = g_array_remove_index(capture_opts->ifaces, capture_opts->ifaces->len - 1);
 707             interface_opts.buffer_size = get_positive_int(optarg_str_p, "buffer size");
 708             g_array_append_val(capture_opts->ifaces, interface_opts);
 709         } else {
 710             capture_opts->default_options.buffer_size = get_positive_int(optarg_str_p, "buffer size");
 711         }
 712         break;
 713 #endif
 714     case 'c':        /* Capture n packets */
 715         capture_opts->has_autostop_packets = TRUE;
 716         capture_opts->autostop_packets = get_positive_int(optarg_str_p, "packet count");
 717         break;
 718     case 'f':        /* capture filter */
 719         if (capture_opts->ifaces->len > 0) {
 720             interface_options interface_opts;
 721
 722             interface_opts = g_array_index(capture_opts->ifaces, interface_options, capture_opts->ifaces->len - 1);
 723             capture_opts->ifaces = g_array_remove_index(capture_opts->ifaces, capture_opts->ifaces->len - 1);
 724             g_free(interface_opts.cfilter);
 725             interface_opts.cfilter = g_strdup(optarg_str_p);
 726             g_array_append_val(capture_opts->ifaces, interface_opts);
 727         } else {
 728             g_free(capture_opts->default_options.cfilter);
 729             capture_opts->default_options.cfilter = g_strdup(optarg_str_p);
 730         }
 731         break;
 732     case 'g':        /* enable group read access on the capture file(s) */
 733         capture_opts->group_read_access = TRUE;
 734         break;
 735     case 'H':        /* Hide capture info dialog box */
 736         capture_opts->show_info = FALSE;
 737         break;
 738     case 'i':        /* Use interface x */
 739         status = capture_opts_add_iface_opt(capture_opts, optarg_str_p);
 740         if (status != 0) {
 741             return status;
 742         }
 743         break;
 744 #ifdef HAVE_PCAP_CREATE
 745     case 'I':        /* Capture in monitor mode */
 746         if (capture_opts->ifaces->len > 0) {
 747             interface_options interface_opts;
 748
 749             interface_opts = g_array_index(capture_opts->ifaces, interface_options, capture_opts->ifaces->len - 1);
 750             capture_opts->ifaces = g_array_remove_index(capture_opts->ifaces, capture_opts->ifaces->len - 1);
 751             interface_opts.monitor_mode = TRUE;
 752             g_array_append_val(capture_opts->ifaces, interface_opts);
 753         } else {
 754             capture_opts->default_options.monitor_mode = TRUE;
 755         }
 756         break;
 757 #endif
 758     case 'k':        /* Start capture immediately */
 759         *start_capture = TRUE;
 760         break;
 761     /*case 'l':*/    /* Automatic scrolling in live capture mode */
 762 #ifdef HAVE_PCAP_SETSAMPLING
 763     case 'm':
 764         if (get_sampling_arguments(capture_opts, optarg_str_p) == FALSE) {
 765             cmdarg_err("Invalid or unknown -m arg \"%s\"", optarg_str_p);
 766             return 1;
 767         }
 768         break;
 769 #endif
 770     case 'n':        /* Use pcapng format */
 771         capture_opts->use_pcapng = TRUE;
 772         break;
 773     case 'p':        /* Don't capture in promiscuous mode */
 774         if (capture_opts->ifaces->len > 0) {
 775             interface_options interface_opts;
 776
 777             interface_opts = g_array_index(capture_opts->ifaces, interface_options, capture_opts->ifaces->len - 1);
 778             capture_opts->ifaces = g_array_remove_index(capture_opts->ifaces, capture_opts->ifaces->len - 1);
 779             interface_opts.promisc_mode = FALSE;
 780             g_array_append_val(capture_opts->ifaces, interface_opts);
 781         } else {
 782             capture_opts->default_options.promisc_mode = FALSE;
 783         }
 784         break;
 785     case 'P':        /* Use pcap format */
 786         capture_opts->use_pcapng = FALSE;
 787         break;
 788 #ifdef HAVE_PCAP_REMOTE
 789     case 'r':
 790         if (capture_opts->ifaces->len > 0) {
 791             interface_options interface_opts;
 792
 793             interface_opts = g_array_index(capture_opts->ifaces, interface_options, capture_opts->ifaces->len - 1);
 794             capture_opts->ifaces = g_array_remove_index(capture_opts->ifaces, capture_opts->ifaces->len - 1);
 795             interface_opts.nocap_rpcap = FALSE;
 796             g_array_append_val(capture_opts->ifaces, interface_opts);
 797         } else {
 798             capture_opts->default_options.nocap_rpcap = FALSE;
 799         }
 800         break;
 801 #endif
 802     case 's':        /* Set the snapshot (capture) length */
 803         snaplen = get_natural_int(optarg_str_p, "snapshot length");
 804         /*
 805          * Make a snapshot length of 0 equivalent to the maximum packet
 806          * length, mirroring what tcpdump does.
 807          */
 808         if (snaplen == 0)
 809             snaplen = WTAP_MAX_PACKET_SIZE;
 810         if (capture_opts->ifaces->len > 0) {
 811             interface_options interface_opts;
 812
 813             interface_opts = g_array_index(capture_opts->ifaces, interface_options, capture_opts->ifaces->len - 1);
 814             capture_opts->ifaces = g_array_remove_index(capture_opts->ifaces, capture_opts->ifaces->len - 1);
 815             interface_opts.has_snaplen = TRUE;
 816             interface_opts.snaplen = snaplen;
 817             g_array_append_val(capture_opts->ifaces, interface_opts);
 818         } else {
 819             capture_opts->default_options.snaplen = snaplen;
 820             capture_opts->default_options.has_snaplen = TRUE;
 821         }
 822         break;
 823     case 'S':        /* "Real-Time" mode: used for following file ala tail -f */
 824         capture_opts->real_time_mode = TRUE;
 825         break;
 826 #ifdef HAVE_PCAP_REMOTE
 827     case 'u':
 828         if (capture_opts->ifaces->len > 0) {
 829             interface_options interface_opts;
 830
 831             interface_opts = g_array_index(capture_opts->ifaces, interface_options, capture_opts->ifaces->len - 1);
 832             capture_opts->ifaces = g_array_remove_index(capture_opts->ifaces, capture_opts->ifaces->len - 1);
 833             interface_opts.datatx_udp = TRUE;
 834             g_array_append_val(capture_opts->ifaces, interface_opts);
 835         } else {
 836             capture_opts->default_options.datatx_udp = TRUE;
 837         }
 838         break;
 839 #endif
 840     case 'w':        /* Write to capture file x */
 841         capture_opts->saving_to_file = TRUE;
 842         g_free(capture_opts->save_file);
 843         capture_opts->save_file = g_strdup(optarg_str_p);
 844         status = capture_opts_output_to_pipe(capture_opts->save_file, &capture_opts->output_to_pipe);
 845         return status;
 846     case 'y':        /* Set the pcap data link type */
 847         if (capture_opts->ifaces->len > 0) {
 848             interface_options interface_opts;
 849
 850             interface_opts = g_array_index(capture_opts->ifaces, interface_options, capture_opts->ifaces->len - 1);
 851             capture_opts->ifaces = g_array_remove_index(capture_opts->ifaces, capture_opts->ifaces->len - 1);
 852             interface_opts.linktype = linktype_name_to_val(optarg_str_p);
 853             if (interface_opts.linktype == -1) {
 854                 cmdarg_err("The specified data link type \"%s\" isn't valid",
 855                            optarg_str_p);
 856                 return 1;
 857             }
 858             g_array_append_val(capture_opts->ifaces, interface_opts);
 859         } else {
 860             capture_opts->default_options.linktype = linktype_name_to_val(optarg_str_p);
 861             if (capture_opts->default_options.linktype == -1) {
 862                 cmdarg_err("The specified data link type \"%s\" isn't valid",
 863                            optarg_str_p);
 864                 return 1;
 865             }
 866         }
 867         break;
 868     default:
 869         /* the caller is responsible to send us only the right opt's */
 870         g_assert_not_reached();
 871     }
 872
 873     return 0;
 874 }
 875
 876 void
 877 capture_opts_print_if_capabilities(if_capabilities_t *caps, char *name,
 878                                    gboolean monitor_mode)
 879 {
 880     GList *lt_entry;
 881     data_link_info_t *data_link_info;
 882
 883     if (caps->can_set_rfmon)
 884         printf("Data link types of interface %s when %sin monitor mode (use option -y to set):\n",
 885                name, monitor_mode ? "" : "not ");
 886     else
 887         printf("Data link types of interface %s (use option -y to set):\n", name);
 888     for (lt_entry = caps->data_link_types; lt_entry != NULL;
 889          lt_entry = g_list_next(lt_entry)) {
 890         data_link_info = (data_link_info_t *)lt_entry->data;
 891         printf("  %s", data_link_info->name);
 892         if (data_link_info->description != NULL)
 893             printf(" (%s)", data_link_info->description);
 894         else
 895             printf(" (not supported)");
 896         printf("\n");
 897     }
 898 }
 899
 900 /* Print an ASCII-formatted list of interfaces. */
 901 void
 902 capture_opts_print_interfaces(GList *if_list)
 903 {
 904     int         i;
 905     GList       *if_entry;
 906     if_info_t   *if_info;
 907
 908     i = 1;  /* Interface id number */
 909     for (if_entry = g_list_first(if_list); if_entry != NULL;
 910          if_entry = g_list_next(if_entry)) {
 911         if_info = (if_info_t *)if_entry->data;
 912         printf("%d. %s", i++, if_info->name);
 913
 914         /* Print the interface friendly name, if it exists;
 915           if not fall back to vendor description, if it exists. */
 916         if (if_info->friendly_name != NULL){
 917             printf(" (%s)", if_info->friendly_name);
 918         } else {
 919             if (if_info->vendor_description != NULL)
 920                 printf(" (%s)", if_info->vendor_description);
 921         }
 922         printf("\n");
 923     }
 924 }
 925
 926
 927 void
 928 capture_opts_trim_snaplen(capture_options *capture_opts, int snaplen_min)
 929 {
 930     guint i;
 931     interface_options interface_opts;
 932
 933     if (capture_opts->ifaces->len > 0) {
 934         for (i = 0; i < capture_opts->ifaces->len; i++) {
 935             interface_opts = g_array_index(capture_opts->ifaces, interface_options, 0);
 936             capture_opts->ifaces = g_array_remove_index(capture_opts->ifaces, 0);
 937             if (interface_opts.snaplen < 1)
 938                 interface_opts.snaplen = WTAP_MAX_PACKET_SIZE;
 939             else if (interface_opts.snaplen < snaplen_min)
 940                 interface_opts.snaplen = snaplen_min;
 941             g_array_append_val(capture_opts->ifaces, interface_opts);
 942         }
 943     } else {
 944         if (capture_opts->default_options.snaplen < 1)
 945             capture_opts->default_options.snaplen = WTAP_MAX_PACKET_SIZE;
 946         else if (capture_opts->default_options.snaplen < snaplen_min)
 947             capture_opts->default_options.snaplen = snaplen_min;
 948     }
 949 }
 950
 951
 952 void
 953 capture_opts_trim_ring_num_files(capture_options *capture_opts)
 954 {
 955     /* Check the value range of the ring_num_files parameter */
 956     if (capture_opts->ring_num_files > RINGBUFFER_MAX_NUM_FILES) {
 957         cmdarg_err("Too many ring buffer files (%u). Reducing to %u.\n", capture_opts->ring_num_files, RINGBUFFER_MAX_NUM_FILES);
 958         capture_opts->ring_num_files = RINGBUFFER_MAX_NUM_FILES;
 959     } else if (capture_opts->ring_num_files > RINGBUFFER_WARN_NUM_FILES) {
 960         cmdarg_err("%u is a lot of ring buffer files.\n", capture_opts->ring_num_files);
 961     }
 962 #if RINGBUFFER_MIN_NUM_FILES > 0
 963     else if (capture_opts->ring_num_files < RINGBUFFER_MIN_NUM_FILES)
 964         cmdarg_err("Too few ring buffer files (%u). Increasing to %u.\n", capture_opts->ring_num_files, RINGBUFFER_MIN_NUM_FILES);
 965         capture_opts->ring_num_files = RINGBUFFER_MIN_NUM_FILES;
 966 #endif
 967 }
 968
 969 /*
 970  * If no interface was specified explicitly, pick a default.
 971  */
 972 int
 973 capture_opts_default_iface_if_necessary(capture_options *capture_opts,
 974                                         const char *capture_device)
 975 {
 976     int status;
 977
 978     /* Did the user specify an interface to use? */
 979     if (capture_opts->num_selected != 0 || capture_opts->ifaces->len != 0) {
 980         /* yes they did, return immediately - nothing further to do here */
 981         return 0;
 982     }
 983
 984     /* No - is a default specified in the preferences file? */
 985     if (capture_device != NULL) {
 986         /* Yes - use it. */
 987         status = capture_opts_add_iface_opt(capture_opts, capture_device);
 988         return status;
 989     }
 990     /* No default in preferences file, just pick the first interface from the list of interfaces. */
 991     return capture_opts_add_iface_opt(capture_opts, "1");
 992 }
 993
 994 #ifndef S_IFIFO
 995 #define S_IFIFO _S_IFIFO
 996 #endif
 997 #ifndef S_ISFIFO
 998 #define S_ISFIFO(mode)  (((mode) & S_IFMT) == S_IFIFO)
 999 #endif
1000
1001 /* copied from filesystem.c */
1002 static int
1003 capture_opts_test_for_fifo(const char *path)
1004 {
1005     ws_statb64 statb;
1006
1007     if (ws_stat64(path, &statb) < 0)
1008         return errno;
1009
1010     if (S_ISFIFO(statb.st_mode))
1011         return ESPIPE;
1012     else
1013         return 0;
1014 }
1015
1016 static gboolean
1017 capture_opts_output_to_pipe(const char *save_file, gboolean *is_pipe)
1018 {
1019     int err;
1020
1021     *is_pipe = FALSE;
1022
1023     if (save_file != NULL) {
1024         /* We're writing to a capture file. */
1025         if (strcmp(save_file, "-") == 0) {
1026             /* Writing to stdout. */
1027             /* XXX - should we check whether it's a pipe?  It's arguably
1028                silly to do "-w - >output_file" rather than "-w output_file",
1029                but by not checking we might be violating the Principle Of
1030                Least Astonishment. */
1031             *is_pipe = TRUE;
1032         } else {
1033             /* not writing to stdout, test for a FIFO (aka named pipe) */
1034             err = capture_opts_test_for_fifo(save_file);
1035             switch (err) {
1036
1037             case ENOENT:      /* it doesn't exist, so we'll be creating it,
1038                                  and it won't be a FIFO */
1039             case 0:           /* found it, but it's not a FIFO */
1040                 break;
1041
1042             case ESPIPE:      /* it is a FIFO */
1043                 *is_pipe = TRUE;
1044                 break;
1045
1046             default:          /* couldn't stat it              */
1047                 break;          /* ignore: later attempt to open */
1048                 /*  will generate a nice msg     */
1049             }
1050         }
1051     }
1052
1053     return 0;
1054 }
1055
1056 void
1057 capture_opts_del_iface(capture_options *capture_opts, guint if_index)
1058 {
1059     interface_options interface_opts;
1060
1061     interface_opts = g_array_index(capture_opts->ifaces, interface_options, if_index);
1062     /* XXX - check if found? */
1063
1064     g_free(interface_opts.name);
1065     g_free(interface_opts.descr);
1066     if (interface_opts.console_display_name != NULL)
1067         g_free(interface_opts.console_display_name);
1068     g_free(interface_opts.cfilter);
1069 #ifdef HAVE_EXTCAP
1070     g_free(interface_opts.extcap);
1071     g_free(interface_opts.extcap_fifo);
1072     if (interface_opts.extcap_args)
1073         g_hash_table_unref(interface_opts.extcap_args);
1074     if (interface_opts.extcap_pid != INVALID_EXTCAP_PID)
1075         g_spawn_close_pid(interface_opts.extcap_pid);
1076 #endif
1077 #ifdef HAVE_PCAP_REMOTE
1078     if (interface_opts.src_type == CAPTURE_IFREMOTE) {
1079         g_free(interface_opts.remote_host);
1080         g_free(interface_opts.remote_port);
1081         g_free(interface_opts.auth_username);
1082         g_free(interface_opts.auth_password);
1083     }
1084 #endif
1085     capture_opts->ifaces = g_array_remove_index(capture_opts->ifaces, if_index);
1086 }
1087
1088
1089
1090 /*
1091  * Add all non-hidden selected interfaces in the "all interfaces" list
1092  * to the list of interfaces for the capture.
1093  */
1094 void
1095 collect_ifaces(capture_options *capture_opts)
1096 {
1097     guint i;
1098     interface_t device;
1099     interface_options interface_opts;
1100
1101     /* Empty out the existing list of interfaces. */
1102     for (i = capture_opts->ifaces->len; i != 0; i--)
1103         capture_opts_del_iface(capture_opts, i-1);
1104
1105     /* Now fill the list up again. */
1106     for (i = 0; i < capture_opts->all_ifaces->len; i++) {
1107         device = g_array_index(capture_opts->all_ifaces, interface_t, i);
1108         if (!device.hidden && device.selected) {
1109             interface_opts.name = g_strdup(device.name);
1110             interface_opts.descr = g_strdup(device.display_name);
1111             interface_opts.console_display_name = g_strdup(device.name);
1112             interface_opts.linktype = device.active_dlt;
1113             interface_opts.cfilter = g_strdup(device.cfilter);
1114             interface_opts.snaplen = device.snaplen;
1115             interface_opts.has_snaplen = device.has_snaplen;
1116             interface_opts.promisc_mode = device.pmode;
1117             interface_opts.if_type = device.if_info.type;
1118 #ifdef HAVE_EXTCAP
1119             interface_opts.extcap = g_strdup(device.if_info.extcap);
1120             interface_opts.extcap_fifo = NULL;
1121             interface_opts.extcap_args = device.external_cap_args_settings;
1122             interface_opts.extcap_pid = INVALID_EXTCAP_PID;
1123             if (interface_opts.extcap_args)
1124                 g_hash_table_ref(interface_opts.extcap_args);
1125 #endif
1126 #ifdef CAN_SET_CAPTURE_BUFFER_SIZE
1127             interface_opts.buffer_size =  device.buffer;
1128 #endif
1129 #ifdef HAVE_PCAP_CREATE
1130             interface_opts.monitor_mode = device.monitor_mode_enabled;
1131 #endif
1132 #ifdef HAVE_PCAP_REMOTE
1133             interface_opts.src_type = CAPTURE_IFREMOTE;
1134             interface_opts.remote_host = g_strdup(device.remote_opts.remote_host_opts.remote_host);
1135             interface_opts.remote_port = g_strdup(device.remote_opts.remote_host_opts.remote_port);
1136             interface_opts.auth_type = device.remote_opts.remote_host_opts.auth_type;
1137             interface_opts.auth_username = g_strdup(device.remote_opts.remote_host_opts.auth_username);
1138             interface_opts.auth_password = g_strdup(device.remote_opts.remote_host_opts.auth_password);
1139             interface_opts.datatx_udp = device.remote_opts.remote_host_opts.datatx_udp;
1140             interface_opts.nocap_rpcap = device.remote_opts.remote_host_opts.nocap_rpcap;
1141             interface_opts.nocap_local = device.remote_opts.remote_host_opts.nocap_local;
1142 #endif
1143 #ifdef HAVE_PCAP_SETSAMPLING
1144             interface_opts.sampling_method = device.remote_opts.sampling_method;
1145             interface_opts.sampling_param  = device.remote_opts.sampling_param;
1146 #endif
1147             g_array_append_val(capture_opts->ifaces, interface_opts);
1148         } else {
1149             continue;
1150         }
1151     }
1152 }
1153
1154
1155 #endif /* HAVE_LIBPCAP */
1156
1157 /*
1158  * Editor modelines  -  http://www.wireshark.org/tools/modelines.html
1159  *
1160  * Local variables:
1161  * c-basic-offset: 4
1162  * tab-width: 8
1163  * indent-tabs-mode: nil
1164  * End:
1165  *
1166  * vi: set shiftwidth=4 tabstop=8 expandtab:
1167  * :indentSize=4:tabSize=8:noTabs=true:
1168  */