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 #include <errno.h>
  33
  34 #include <glib.h>
  35
  36 #include "capture_opts.h"
  37 #include "ringbuffer.h"
  38
  39 #include <wsutil/clopts_common.h>
  40 #include <wsutil/cmdarg_err.h>
  41 #include <wsutil/file_util.h>
  42
  43 #include "caputils/capture_ifinfo.h"
  44 #include "caputils/capture-pcap-util.h"
  45
  46 #include "filter_files.h"
  47
  48 static gboolean capture_opts_output_to_pipe(const char *save_file, gboolean *is_pipe);
  49
  50
  51 void
  52 capture_opts_init(capture_options *capture_opts)
  53 {
  54     capture_opts->ifaces                          = g_array_new(FALSE, FALSE, sizeof(interface_options));
  55     capture_opts->all_ifaces                      = g_array_new(FALSE, FALSE, sizeof(interface_t));
  56     capture_opts->num_selected                    = 0;
  57     capture_opts->default_options.name            = NULL;
  58     capture_opts->default_options.descr           = NULL;
  59     capture_opts->default_options.cfilter         = NULL;
  60     capture_opts->default_options.has_snaplen     = FALSE;
  61     capture_opts->default_options.snaplen         = WTAP_MAX_PACKET_SIZE;
  62     capture_opts->default_options.linktype        = -1; /* use interface default */
  63     capture_opts->default_options.promisc_mode    = TRUE;
  64     capture_opts->default_options.if_type         = IF_WIRED;
  65 #ifdef HAVE_EXTCAP
  66     capture_opts->default_options.extcap          = NULL;
  67     capture_opts->default_options.extcap_fifo     = NULL;
  68     capture_opts->default_options.extcap_args     = NULL;
  69     capture_opts->default_options.extcap_pid      = INVALID_EXTCAP_PID;
  70 #endif
  71 #ifdef CAN_SET_CAPTURE_BUFFER_SIZE
  72     capture_opts->default_options.buffer_size     = DEFAULT_CAPTURE_BUFFER_SIZE;
  73 #endif
  74     capture_opts->default_options.monitor_mode    = FALSE;
  75 #ifdef HAVE_PCAP_REMOTE
  76     capture_opts->default_options.src_type        = CAPTURE_IFLOCAL;
  77     capture_opts->default_options.remote_host     = NULL;
  78     capture_opts->default_options.remote_port     = NULL;
  79     capture_opts->default_options.auth_type       = CAPTURE_AUTH_NULL;
  80     capture_opts->default_options.auth_username   = NULL;
  81     capture_opts->default_options.auth_password   = NULL;
  82     capture_opts->default_options.datatx_udp      = FALSE;
  83     capture_opts->default_options.nocap_rpcap     = TRUE;
  84     capture_opts->default_options.nocap_local     = FALSE;
  85 #endif
  86 #ifdef HAVE_PCAP_SETSAMPLING
  87     capture_opts->default_options.sampling_method = CAPTURE_SAMP_NONE;
  88     capture_opts->default_options.sampling_param  = 0;
  89 #endif
  90     capture_opts->saving_to_file                  = FALSE;
  91     capture_opts->save_file                       = NULL;
  92     capture_opts->group_read_access               = FALSE;
  93 #ifdef PCAP_NG_DEFAULT
  94     capture_opts->use_pcapng                      = TRUE;             /* Save as pcap-ng by default */
  95 #else
  96     capture_opts->use_pcapng                      = FALSE;            /* Save as pcap by default */
  97 #endif
  98     capture_opts->real_time_mode                  = TRUE;
  99     capture_opts->show_info                       = TRUE;
 100     capture_opts->quit_after_cap                  = getenv("WIRESHARK_QUIT_AFTER_CAPTURE") ? TRUE : FALSE;
 101     capture_opts->restart                         = FALSE;
 102     capture_opts->orig_save_file                  = NULL;
 103
 104     capture_opts->multi_files_on                  = FALSE;
 105     capture_opts->has_file_duration               = FALSE;
 106     capture_opts->file_duration                   = 60;               /* 1 min */
 107     capture_opts->has_ring_num_files              = FALSE;
 108     capture_opts->ring_num_files                  = RINGBUFFER_MIN_NUM_FILES;
 109
 110     capture_opts->has_autostop_files              = FALSE;
 111     capture_opts->autostop_files                  = 1;
 112     capture_opts->has_autostop_packets            = FALSE;
 113     capture_opts->autostop_packets                = 0;
 114     capture_opts->has_autostop_filesize           = FALSE;
 115     capture_opts->autostop_filesize               = 1000;             /* 1 MB */
 116     capture_opts->has_autostop_duration           = FALSE;
 117     capture_opts->autostop_duration               = 60;               /* 1 min */
 118     capture_opts->capture_comment                 = NULL;
 119
 120     capture_opts->output_to_pipe                  = FALSE;
 121     capture_opts->capture_child                   = FALSE;
 122 }
 123
 124
 125 /* log content of capture_opts */
 126 void
 127 capture_opts_log(const char *log_domain, GLogLevelFlags log_level, capture_options *capture_opts) {
 128     guint i;
 129
 130     g_log(log_domain, log_level, "CAPTURE OPTIONS     :");
 131
 132     for (i = 0; i < capture_opts->ifaces->len; i++) {
 133         interface_options interface_opts;
 134
 135         interface_opts = g_array_index(capture_opts->ifaces, interface_options, i);
 136         g_log(log_domain, log_level, "Interface name[%02d]  : %s", i, interface_opts.name ? interface_opts.name : "(unspecified)");
 137         g_log(log_domain, log_level, "Interface description[%02d] : %s", i, interface_opts.descr ? interface_opts.descr : "(unspecified)");
 138         g_log(log_domain, log_level, "Console display name[%02d]: %s", i, interface_opts.console_display_name ? interface_opts.console_display_name : "(unspecified)");
 139         g_log(log_domain, log_level, "Capture filter[%02d]  : %s", i, interface_opts.cfilter ? interface_opts.cfilter : "(unspecified)");
 140         g_log(log_domain, log_level, "Snap length[%02d] (%u) : %d", i, interface_opts.has_snaplen, interface_opts.snaplen);
 141         g_log(log_domain, log_level, "Link Type[%02d]       : %d", i, interface_opts.linktype);
 142         g_log(log_domain, log_level, "Promiscuous Mode[%02d]: %s", i, interface_opts.promisc_mode?"TRUE":"FALSE");
 143 #ifdef HAVE_EXTCAP
 144         g_log(log_domain, log_level, "Extcap[%02d]          : %s", i, interface_opts.extcap ? interface_opts.extcap : "(unspecified)");
 145         g_log(log_domain, log_level, "Extcap FIFO[%02d]     : %s", i, interface_opts.extcap_fifo ? interface_opts.extcap_fifo : "(unspecified)");
 146         g_log(log_domain, log_level, "Extcap PID[%02d]      : %d", i, interface_opts.extcap_pid);
 147 #endif
 148 #ifdef CAN_SET_CAPTURE_BUFFER_SIZE
 149         g_log(log_domain, log_level, "Buffer size[%02d]     : %d (MB)", i, interface_opts.buffer_size);
 150 #endif
 151         g_log(log_domain, log_level, "Monitor Mode[%02d]    : %s", i, interface_opts.monitor_mode?"TRUE":"FALSE");
 152 #ifdef HAVE_PCAP_REMOTE
 153         g_log(log_domain, log_level, "Capture source[%02d]  : %s", i,
 154             interface_opts.src_type == CAPTURE_IFLOCAL ? "Local interface" :
 155             interface_opts.src_type == CAPTURE_IFREMOTE ? "Remote interface" :
 156             "Unknown");
 157         if (interface_opts.src_type == CAPTURE_IFREMOTE) {
 158             g_log(log_domain, log_level, "Remote host[%02d]     : %s", i, interface_opts.remote_host ? interface_opts.remote_host : "(unspecified)");
 159             g_log(log_domain, log_level, "Remote port[%02d]     : %s", i, interface_opts.remote_port ? interface_opts.remote_port : "(unspecified)");
 160         }
 161         g_log(log_domain, log_level, "Authentication[%02d]  : %s", i,
 162             interface_opts.auth_type == CAPTURE_AUTH_NULL ? "Null" :
 163             interface_opts.auth_type == CAPTURE_AUTH_PWD ? "By username/password" :
 164             "Unknown");
 165         if (interface_opts.auth_type == CAPTURE_AUTH_PWD) {
 166             g_log(log_domain, log_level, "Auth username[%02d]   : %s", i, interface_opts.auth_username ? interface_opts.auth_username : "(unspecified)");
 167             g_log(log_domain, log_level, "Auth password[%02d]   : <hidden>", i);
 168         }
 169         g_log(log_domain, log_level, "UDP data tfer[%02d]   : %u", i, interface_opts.datatx_udp);
 170         g_log(log_domain, log_level, "No cap. RPCAP[%02d]   : %u", i, interface_opts.nocap_rpcap);
 171         g_log(log_domain, log_level, "No cap. local[%02d]   : %u", i, interface_opts.nocap_local);
 172 #endif
 173 #ifdef HAVE_PCAP_SETSAMPLING
 174         g_log(log_domain, log_level, "Sampling meth.[%02d]  : %d", i, interface_opts.sampling_method);
 175         g_log(log_domain, log_level, "Sampling param.[%02d] : %d", i, interface_opts.sampling_param);
 176 #endif
 177     }
 178     g_log(log_domain, log_level, "Interface name[df]  : %s", capture_opts->default_options.name ? capture_opts->default_options.name : "(unspecified)");
 179     g_log(log_domain, log_level, "Interface Descr[df] : %s", capture_opts->default_options.descr ? capture_opts->default_options.descr : "(unspecified)");
 180     g_log(log_domain, log_level, "Capture filter[df]  : %s", capture_opts->default_options.cfilter ? capture_opts->default_options.cfilter : "(unspecified)");
 181     g_log(log_domain, log_level, "Snap length[df] (%u) : %d", capture_opts->default_options.has_snaplen, capture_opts->default_options.snaplen);
 182     g_log(log_domain, log_level, "Link Type[df]       : %d", capture_opts->default_options.linktype);
 183     g_log(log_domain, log_level, "Promiscuous Mode[df]: %s", capture_opts->default_options.promisc_mode?"TRUE":"FALSE");
 184 #ifdef HAVE_EXTCAP
 185     g_log(log_domain, log_level, "Extcap[df]          : %s", capture_opts->default_options.extcap ? capture_opts->default_options.extcap : "(unspecified)");
 186     g_log(log_domain, log_level, "Extcap FIFO[df]     : %s", capture_opts->default_options.extcap_fifo ? capture_opts->default_options.extcap_fifo : "(unspecified)");
 187 #endif
 188 #ifdef CAN_SET_CAPTURE_BUFFER_SIZE
 189     g_log(log_domain, log_level, "Buffer size[df]     : %d (MB)", capture_opts->default_options.buffer_size);
 190 #endif
 191     g_log(log_domain, log_level, "Monitor Mode[df]    : %s", capture_opts->default_options.monitor_mode?"TRUE":"FALSE");
 192 #ifdef HAVE_PCAP_REMOTE
 193     g_log(log_domain, log_level, "Capture source[df]  : %s",
 194         capture_opts->default_options.src_type == CAPTURE_IFLOCAL ? "Local interface" :
 195         capture_opts->default_options.src_type == CAPTURE_IFREMOTE ? "Remote interface" :
 196         "Unknown");
 197     if (capture_opts->default_options.src_type == CAPTURE_IFREMOTE) {
 198         g_log(log_domain, log_level, "Remote host[df]     : %s", capture_opts->default_options.remote_host ? capture_opts->default_options.remote_host : "(unspecified)");
 199         g_log(log_domain, log_level, "Remote port[df]     : %s", capture_opts->default_options.remote_port ? capture_opts->default_options.remote_port : "(unspecified)");
 200     }
 201     g_log(log_domain, log_level, "Authentication[df]  : %s",
 202         capture_opts->default_options.auth_type == CAPTURE_AUTH_NULL ? "Null" :
 203         capture_opts->default_options.auth_type == CAPTURE_AUTH_PWD ? "By username/password" :
 204         "Unknown");
 205     if (capture_opts->default_options.auth_type == CAPTURE_AUTH_PWD) {
 206         g_log(log_domain, log_level, "Auth username[df]   : %s", capture_opts->default_options.auth_username ? capture_opts->default_options.auth_username : "(unspecified)");
 207         g_log(log_domain, log_level, "Auth password[df]   : <hidden>");
 208     }
 209     g_log(log_domain, log_level, "UDP data tfer[df]   : %u", capture_opts->default_options.datatx_udp);
 210     g_log(log_domain, log_level, "No cap. RPCAP[df]   : %u", capture_opts->default_options.nocap_rpcap);
 211     g_log(log_domain, log_level, "No cap. local[df]   : %u", capture_opts->default_options.nocap_local);
 212 #endif
 213 #ifdef HAVE_PCAP_SETSAMPLING
 214     g_log(log_domain, log_level, "Sampling meth. [df] : %d", capture_opts->default_options.sampling_method);
 215     g_log(log_domain, log_level, "Sampling param.[df] : %d", capture_opts->default_options.sampling_param);
 216 #endif
 217     g_log(log_domain, log_level, "SavingToFile        : %u", capture_opts->saving_to_file);
 218     g_log(log_domain, log_level, "SaveFile            : %s", (capture_opts->save_file) ? capture_opts->save_file : "");
 219     g_log(log_domain, log_level, "GroupReadAccess     : %u", capture_opts->group_read_access);
 220     g_log(log_domain, log_level, "Fileformat          : %s", (capture_opts->use_pcapng) ? "PCAPNG" : "PCAP");
 221     g_log(log_domain, log_level, "RealTimeMode        : %u", capture_opts->real_time_mode);
 222     g_log(log_domain, log_level, "ShowInfo            : %u", capture_opts->show_info);
 223     g_log(log_domain, log_level, "QuitAfterCap        : %u", capture_opts->quit_after_cap);
 224
 225     g_log(log_domain, log_level, "MultiFilesOn        : %u", capture_opts->multi_files_on);
 226     g_log(log_domain, log_level, "FileDuration    (%u) : %u", capture_opts->has_file_duration, capture_opts->file_duration);
 227     g_log(log_domain, log_level, "RingNumFiles    (%u) : %u", capture_opts->has_ring_num_files, capture_opts->ring_num_files);
 228
 229     g_log(log_domain, log_level, "AutostopFiles   (%u) : %u", capture_opts->has_autostop_files, capture_opts->autostop_files);
 230     g_log(log_domain, log_level, "AutostopPackets (%u) : %u", capture_opts->has_autostop_packets, capture_opts->autostop_packets);
 231     g_log(log_domain, log_level, "AutostopFilesize(%u) : %u (KB)", capture_opts->has_autostop_filesize, capture_opts->autostop_filesize);
 232     g_log(log_domain, log_level, "AutostopDuration(%u) : %u", capture_opts->has_autostop_duration, capture_opts->autostop_duration);
 233 }
 234
 235 /*
 236  * Given a string of the form "<autostop criterion>:<value>", as might appear
 237  * as an argument to a "-a" option, parse it and set the criterion in
 238  * question.  Return an indication of whether it succeeded or failed
 239  * in some fashion.
 240  */
 241 static gboolean
 242 set_autostop_criterion(capture_options *capture_opts, const char *autostoparg)
 243 {
 244     gchar *p, *colonp;
 245
 246     colonp = strchr(autostoparg, ':');
 247     if (colonp == NULL)
 248         return FALSE;
 249
 250     p = colonp;
 251     *p++ = '\0';
 252
 253     /*
 254      * Skip over any white space (there probably won't be any, but
 255      * as we allow it in the preferences file, we might as well
 256      * allow it here).
 257      */
 258     while (g_ascii_isspace(*p))
 259         p++;
 260     if (*p == '\0') {
 261         /*
 262          * Put the colon back, so if our caller uses, in an
 263          * error message, the string they passed us, the message
 264          * looks correct.
 265          */
 266         *colonp = ':';
 267         return FALSE;
 268     }
 269     if (strcmp(autostoparg,"duration") == 0) {
 270         capture_opts->has_autostop_duration = TRUE;
 271         capture_opts->autostop_duration = get_positive_int(p,"autostop duration");
 272     } else if (strcmp(autostoparg,"filesize") == 0) {
 273         capture_opts->has_autostop_filesize = TRUE;
 274         capture_opts->autostop_filesize = get_positive_int(p,"autostop filesize");
 275     } else if (strcmp(autostoparg,"files") == 0) {
 276         capture_opts->multi_files_on = TRUE;
 277         capture_opts->has_autostop_files = TRUE;
 278         capture_opts->autostop_files = get_positive_int(p,"autostop files");
 279     } else {
 280         return FALSE;
 281     }
 282     *colonp = ':'; /* put the colon back */
 283     return TRUE;
 284 }
 285
 286 static gboolean get_filter_arguments(capture_options* capture_opts, const char* arg)
 287 {
 288     char* colonp;
 289     char* val;
 290     char* filter_exp = NULL;
 291
 292     colonp = strchr(arg, ':');
 293     if (colonp) {
 294         val = colonp;
 295         *val = '\0';
 296         val++;
 297         if (strcmp(arg, "predef") == 0) {
 298             GList* filterItem;
 299
 300             filterItem = get_filter_list_first(CFILTER_LIST);
 301             while (filterItem != NULL) {
 302                 filter_def *filterDef;
 303
 304                 filterDef = (filter_def*)filterItem->data;
 305                 if (strcmp(val, filterDef->name) == 0) {
 306                     filter_exp = g_strdup(filterDef->strval);
 307                     break;
 308                 }
 309                 filterItem = filterItem->next;
 310             }
 311         }
 312     }
 313
 314     if (filter_exp == NULL) {
 315         /* No filter expression found yet; fallback to previous implemention
 316            and assume the arg contains a filter expression */
 317         if (colonp) {
 318             *colonp = ':';      /* restore colon */
 319         }
 320         filter_exp = g_strdup(arg);
 321     }
 322
 323     if (capture_opts->ifaces->len > 0) {
 324         interface_options interface_opts;
 325
 326         interface_opts = g_array_index(capture_opts->ifaces, interface_options, capture_opts->ifaces->len - 1);
 327         capture_opts->ifaces = g_array_remove_index(capture_opts->ifaces, capture_opts->ifaces->len - 1);
 328         g_free(interface_opts.cfilter);
 329         interface_opts.cfilter = filter_exp;
 330         g_array_append_val(capture_opts->ifaces, interface_opts);
 331         return TRUE;
 332     }
 333     else {
 334         g_free(capture_opts->default_options.cfilter);
 335         capture_opts->default_options.cfilter = filter_exp;
 336         return TRUE;
 337     }
 338 }
 339
 340 /*
 341  * Given a string of the form "<ring buffer file>:<duration>", as might appear
 342  * as an argument to a "-b" 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_ring_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     /*
 359      * Skip over any white space (there probably won't be any, but
 360      * as we allow it in the preferences file, we might as well
 361      * allow it here).
 362      */
 363     while (g_ascii_isspace(*p))
 364         p++;
 365     if (*p == '\0') {
 366         /*
 367          * Put the colon back, so if our caller uses, in an
 368          * error message, the string they passed us, the message
 369          * looks correct.
 370          */
 371         *colonp = ':';
 372         return FALSE;
 373     }
 374
 375     if (strcmp(arg,"files") == 0) {
 376         capture_opts->has_ring_num_files = TRUE;
 377         capture_opts->ring_num_files = get_positive_int(p, "number of ring buffer files");
 378     } else if (strcmp(arg,"filesize") == 0) {
 379         capture_opts->has_autostop_filesize = TRUE;
 380         capture_opts->autostop_filesize = get_positive_int(p, "ring buffer filesize");
 381     } else if (strcmp(arg,"duration") == 0) {
 382         capture_opts->has_file_duration = TRUE;
 383         capture_opts->file_duration = get_positive_int(p, "ring buffer duration");
 384     }
 385
 386     *colonp = ':';    /* put the colon back */
 387     return TRUE;
 388 }
 389
 390 #ifdef HAVE_PCAP_SETSAMPLING
 391 /*
 392  * Given a string of the form "<sampling type>:<value>", as might appear
 393  * as an argument to a "-m" option, parse it and set the arguments in
 394  * question.  Return an indication of whether it succeeded or failed
 395  * in some fashion.
 396  */
 397 static gboolean
 398 get_sampling_arguments(capture_options *capture_opts, const char *arg)
 399 {
 400     gchar *p = NULL, *colonp;
 401
 402     colonp = strchr(arg, ':');
 403     if (colonp == NULL)
 404         return FALSE;
 405
 406     p = colonp;
 407     *p++ = '\0';
 408
 409     while (g_ascii_isspace(*p))
 410         p++;
 411     if (*p == '\0') {
 412         *colonp = ':';
 413         return FALSE;
 414     }
 415
 416     if (strcmp(arg, "count") == 0) {
 417         if (capture_opts->ifaces->len > 0) {
 418             interface_options interface_opts;
 419
 420             interface_opts = g_array_index(capture_opts->ifaces, interface_options, capture_opts->ifaces->len - 1);
 421             capture_opts->ifaces = g_array_remove_index(capture_opts->ifaces, capture_opts->ifaces->len - 1);
 422             interface_opts.sampling_method = CAPTURE_SAMP_BY_COUNT;
 423             interface_opts.sampling_param = get_positive_int(p, "sampling count");
 424             g_array_append_val(capture_opts->ifaces, interface_opts);
 425         } else {
 426             capture_opts->default_options.sampling_method = CAPTURE_SAMP_BY_COUNT;
 427             capture_opts->default_options.sampling_param = get_positive_int(p, "sampling count");
 428         }
 429     } else if (strcmp(arg, "timer") == 0) {
 430         if (capture_opts->ifaces->len > 0) {
 431             interface_options interface_opts;
 432
 433             interface_opts = g_array_index(capture_opts->ifaces, interface_options, capture_opts->ifaces->len - 1);
 434             capture_opts->ifaces = g_array_remove_index(capture_opts->ifaces, capture_opts->ifaces->len - 1);
 435             interface_opts.sampling_method = CAPTURE_SAMP_BY_TIMER;
 436             interface_opts.sampling_param = get_positive_int(p, "sampling timer");
 437             g_array_append_val(capture_opts->ifaces, interface_opts);
 438         } else {
 439             capture_opts->default_options.sampling_method = CAPTURE_SAMP_BY_TIMER;
 440             capture_opts->default_options.sampling_param = get_positive_int(p, "sampling timer");
 441         }
 442     }
 443     *colonp = ':';
 444     return TRUE;
 445 }
 446 #endif
 447
 448 #ifdef HAVE_PCAP_REMOTE
 449 /*
 450  * Given a string of the form "<username>:<password>", as might appear
 451  * as an argument to a "-A" option, parse it and set the arguments in
 452  * question.  Return an indication of whether it succeeded or failed
 453  * in some fashion.
 454  */
 455 static gboolean
 456 get_auth_arguments(capture_options *capture_opts, const char *arg)
 457 {
 458     gchar *p = NULL, *colonp;
 459
 460     colonp = strchr(arg, ':');
 461     if (colonp == NULL)
 462         return FALSE;
 463
 464     p = colonp;
 465     *p++ = '\0';
 466
 467     while (g_ascii_isspace(*p))
 468         p++;
 469
 470     if (capture_opts->ifaces->len > 0) {
 471         interface_options interface_opts;
 472
 473         interface_opts = g_array_index(capture_opts->ifaces, interface_options, capture_opts->ifaces->len - 1);
 474         capture_opts->ifaces = g_array_remove_index(capture_opts->ifaces, capture_opts->ifaces->len - 1);
 475         interface_opts.auth_type = CAPTURE_AUTH_PWD;
 476         interface_opts.auth_username = g_strdup(arg);
 477         interface_opts.auth_password = g_strdup(p);
 478         g_array_append_val(capture_opts->ifaces, interface_opts);
 479     } else {
 480         capture_opts->default_options.auth_type = CAPTURE_AUTH_PWD;
 481         capture_opts->default_options.auth_username = g_strdup(arg);
 482         capture_opts->default_options.auth_password = g_strdup(p);
 483     }
 484     *colonp = ':';
 485     return TRUE;
 486 }
 487 #endif
 488
 489 static int
 490 capture_opts_add_iface_opt(capture_options *capture_opts, const char *optarg_str_p)
 491 {
 492     long        adapter_index;
 493     char        *p;
 494     GList       *if_list;
 495     if_info_t   *if_info;
 496     int         err;
 497     gchar       *err_str;
 498     interface_options interface_opts;
 499
 500     /*
 501      * If the argument is a number, treat it as an index into the list
 502      * of adapters, as printed by "tshark -D".
 503      *
 504      * This should be OK on UNIX systems, as interfaces shouldn't have
 505      * names that begin with digits.  It can be useful on Windows, where
 506      * more than one interface can have the same name.
 507      */
 508     adapter_index = strtol(optarg_str_p, &p, 10);
 509     if (p != NULL && *p == '\0') {
 510         if (adapter_index < 0) {
 511             cmdarg_err("The specified adapter index is a negative number");
 512             return 1;
 513         }
 514         if (adapter_index > INT_MAX) {
 515             cmdarg_err("The specified adapter index is too large (greater than %d)",
 516                        INT_MAX);
 517             return 1;
 518         }
 519         if (adapter_index == 0) {
 520             cmdarg_err("There is no interface with that adapter index");
 521             return 1;
 522         }
 523         if_list = capture_interface_list(&err, &err_str, NULL);
 524         if (if_list == NULL) {
 525             if (err == 0)
 526                 cmdarg_err("There are no interfaces on which a capture can be done");
 527             else {
 528                 cmdarg_err("%s", err_str);
 529                 g_free(err_str);
 530             }
 531             return 2;
 532         }
 533         if_info = (if_info_t *)g_list_nth_data(if_list, (int)(adapter_index - 1));
 534         if (if_info == NULL) {
 535             cmdarg_err("There is no interface with that adapter index");
 536             return 1;
 537         }
 538         interface_opts.name = g_strdup(if_info->name);
 539         if (if_info->friendly_name != NULL) {
 540             /*
 541              * We have a friendly name for the interface, so display that
 542              * instead of the interface name/guid.
 543              *
 544              * XXX - on UN*X, the interface name is not quite so ugly,
 545              * and might be more familiar to users; display them both?
 546              */
 547             interface_opts.console_display_name = g_strdup(if_info->friendly_name);
 548         } else {
 549             /* fallback to the interface name */
 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         free_interface_list(if_list);
 557     } else if (capture_opts->capture_child) {
 558         /* In Wireshark capture child mode, thus proper device name is supplied. */
 559         /* No need for trying to match it for friendly names. */
 560         interface_opts.name = g_strdup(optarg_str_p);
 561         interface_opts.console_display_name = g_strdup(optarg_str_p);
 562         interface_opts.if_type = capture_opts->default_options.if_type;
 563 #ifdef HAVE_EXTCAP
 564         interface_opts.extcap = g_strdup(capture_opts->default_options.extcap);
 565 #endif
 566     } else {
 567         /*
 568          * Retrieve the interface list so that we can search for the
 569          * specified option amongst both the interface names and the
 570          * friendly names and so that we find the friendly name even
 571          * if an interface name was specified.
 572          *
 573          * If we can't get the list, just use the specified option as
 574          * the interface name, so that the user can try specifying an
 575          * interface explicitly for testing purposes.
 576          */
 577         if_list = capture_interface_list(&err, NULL, NULL);
 578         if (if_list != NULL) {
 579             /* try and do an exact match (case insensitive) */
 580             GList   *if_entry;
 581             gboolean matched;
 582
 583             matched = FALSE;
 584             for (if_entry = g_list_first(if_list); if_entry != NULL;
 585                  if_entry = g_list_next(if_entry))
 586             {
 587                 if_info = (if_info_t *)if_entry->data;
 588                 /* exact name check */
 589                 if (g_ascii_strcasecmp(if_info->name, optarg_str_p) == 0) {
 590                     /* exact match on the interface name, use that for displaying etc */
 591                     interface_opts.name = g_strdup(if_info->name);
 592
 593                     if (if_info->friendly_name != NULL) {
 594                         /*
 595                          * If we have a friendly name, use that for the
 596                          * console display name, as it is the basis for
 597                          * the auto generated temp filename.
 598                          */
 599                         interface_opts.console_display_name = g_strdup(if_info->friendly_name);
 600                     } else {
 601                         interface_opts.console_display_name = g_strdup(if_info->name);
 602                     }
 603                     interface_opts.if_type = if_info->type;
 604 #ifdef HAVE_EXTCAP
 605                     interface_opts.extcap = g_strdup(if_info->extcap);
 606 #endif
 607                     matched = TRUE;
 608                     break;
 609                 }
 610
 611                 /* exact friendly name check */
 612                 if (if_info->friendly_name != NULL &&
 613                     g_ascii_strcasecmp(if_info->friendly_name, optarg_str_p) == 0) {
 614                     /* exact match - use the friendly name for display */
 615                     interface_opts.name = g_strdup(if_info->name);
 616                     interface_opts.console_display_name = g_strdup(if_info->friendly_name);
 617                     interface_opts.if_type = if_info->type;
 618 #ifdef HAVE_EXTCAP
 619                     interface_opts.extcap = g_strdup(if_info->extcap);
 620 #endif
 621                     matched = TRUE;
 622                     break;
 623                 }
 624             }
 625
 626             /* didn't find, attempt a case insensitive prefix match of the friendly name*/
 627             if (!matched) {
 628                 size_t prefix_length;
 629
 630                 prefix_length = strlen(optarg_str_p);
 631                 for (if_entry = g_list_first(if_list); if_entry != NULL;
 632                      if_entry = g_list_next(if_entry))
 633                 {
 634                     if_info = (if_info_t *)if_entry->data;
 635
 636                     if (if_info->friendly_name != NULL &&
 637                         g_ascii_strncasecmp(if_info->friendly_name, optarg_str_p, prefix_length) == 0) {
 638                         /* prefix match - use the friendly name for display */
 639                         interface_opts.name = g_strdup(if_info->name);
 640                         interface_opts.console_display_name = g_strdup(if_info->friendly_name);
 641                         interface_opts.if_type = if_info->type;
 642 #ifdef HAVE_EXTCAP
 643                         interface_opts.extcap = g_strdup(if_info->extcap);
 644 #endif
 645                         matched = TRUE;
 646                         break;
 647                     }
 648                 }
 649             }
 650             if (!matched) {
 651                 /*
 652                  * We didn't find the interface in the list; just use
 653                  * the specified name, so that, for example, if an
 654                  * interface doesn't show up in the list for some
 655                  * reason, the user can try specifying it explicitly
 656                  * for testing purposes.
 657                  */
 658                 interface_opts.name = g_strdup(optarg_str_p);
 659                 interface_opts.console_display_name = g_strdup(optarg_str_p);
 660                 interface_opts.if_type = capture_opts->default_options.if_type;
 661 #ifdef HAVE_EXTCAP
 662                 interface_opts.extcap = g_strdup(capture_opts->default_options.extcap);
 663 #endif
 664             }
 665             free_interface_list(if_list);
 666         } else {
 667             interface_opts.name = g_strdup(optarg_str_p);
 668             interface_opts.console_display_name = g_strdup(optarg_str_p);
 669             interface_opts.if_type = capture_opts->default_options.if_type;
 670 #ifdef HAVE_EXTCAP
 671             interface_opts.extcap = g_strdup(capture_opts->default_options.extcap);
 672 #endif
 673         }
 674     }
 675
 676     /*  We don't set iface_descr here because doing so requires
 677      *  capture_ui_utils.c which requires epan/prefs.c which is
 678      *  probably a bit too much dependency for here...
 679      */
 680     interface_opts.descr = g_strdup(capture_opts->default_options.descr);
 681     interface_opts.cfilter = g_strdup(capture_opts->default_options.cfilter);
 682     interface_opts.snaplen = capture_opts->default_options.snaplen;
 683     interface_opts.has_snaplen = capture_opts->default_options.has_snaplen;
 684     interface_opts.linktype = capture_opts->default_options.linktype;
 685     interface_opts.promisc_mode = capture_opts->default_options.promisc_mode;
 686 #ifdef HAVE_EXTCAP
 687     interface_opts.extcap_fifo = g_strdup(capture_opts->default_options.extcap_fifo);
 688     interface_opts.extcap_args = NULL;
 689     interface_opts.extcap_pid = INVALID_EXTCAP_PID;
 690 #endif
 691 #ifdef CAN_SET_CAPTURE_BUFFER_SIZE
 692     interface_opts.buffer_size = capture_opts->default_options.buffer_size;
 693 #endif
 694     interface_opts.monitor_mode = capture_opts->default_options.monitor_mode;
 695 #ifdef HAVE_PCAP_REMOTE
 696     interface_opts.src_type = capture_opts->default_options.src_type;
 697     interface_opts.remote_host = g_strdup(capture_opts->default_options.remote_host);
 698     interface_opts.remote_port = g_strdup(capture_opts->default_options.remote_port);
 699     interface_opts.auth_type = capture_opts->default_options.auth_type;
 700     interface_opts.auth_username = g_strdup(capture_opts->default_options.auth_username);
 701     interface_opts.auth_password = g_strdup(capture_opts->default_options.auth_password);
 702     interface_opts.datatx_udp = capture_opts->default_options.datatx_udp;
 703     interface_opts.nocap_rpcap = capture_opts->default_options.nocap_rpcap;
 704     interface_opts.nocap_local = capture_opts->default_options.nocap_local;
 705 #endif
 706 #ifdef HAVE_PCAP_SETSAMPLING
 707     interface_opts.sampling_method = capture_opts->default_options.sampling_method;
 708     interface_opts.sampling_param  = capture_opts->default_options.sampling_param;
 709 #endif
 710
 711     g_array_append_val(capture_opts->ifaces, interface_opts);
 712
 713     return 0;
 714 }
 715
 716
 717 int
 718 capture_opts_add_opt(capture_options *capture_opts, int opt, const char *optarg_str_p, gboolean *start_capture)
 719 {
 720     int status, snaplen;
 721
 722     switch(opt) {
 723     case LONGOPT_NUM_CAP_COMMENT:  /* capture comment */
 724         if (capture_opts->capture_comment) {
 725             cmdarg_err("--capture-comment can be set only once per file");
 726             return 1;
 727         }
 728         capture_opts->capture_comment = g_strdup(optarg_str_p);
 729         break;
 730     case 'a':        /* autostop criteria */
 731         if (set_autostop_criterion(capture_opts, optarg_str_p) == FALSE) {
 732             cmdarg_err("Invalid or unknown -a flag \"%s\"", optarg_str_p);
 733             return 1;
 734         }
 735         break;
 736 #ifdef HAVE_PCAP_REMOTE
 737     case 'A':
 738         if (get_auth_arguments(capture_opts, optarg_str_p) == FALSE) {
 739             cmdarg_err("Invalid or unknown -A arg \"%s\"", optarg_str_p);
 740             return 1;
 741         }
 742         break;
 743 #endif
 744     case 'b':        /* Ringbuffer option */
 745         capture_opts->multi_files_on = TRUE;
 746         if (get_ring_arguments(capture_opts, optarg_str_p) == FALSE) {
 747             cmdarg_err("Invalid or unknown -b arg \"%s\"", optarg_str_p);
 748             return 1;
 749         }
 750         break;
 751 #ifdef CAN_SET_CAPTURE_BUFFER_SIZE
 752     case 'B':        /* Buffer size */
 753         if (capture_opts->ifaces->len > 0) {
 754             interface_options interface_opts;
 755
 756             interface_opts = g_array_index(capture_opts->ifaces, interface_options, capture_opts->ifaces->len - 1);
 757             capture_opts->ifaces = g_array_remove_index(capture_opts->ifaces, capture_opts->ifaces->len - 1);
 758             interface_opts.buffer_size = get_positive_int(optarg_str_p, "buffer size");
 759             g_array_append_val(capture_opts->ifaces, interface_opts);
 760         } else {
 761             capture_opts->default_options.buffer_size = get_positive_int(optarg_str_p, "buffer size");
 762         }
 763         break;
 764 #endif
 765     case 'c':        /* Capture n packets */
 766         capture_opts->has_autostop_packets = TRUE;
 767         capture_opts->autostop_packets = get_positive_int(optarg_str_p, "packet count");
 768         break;
 769     case 'f':        /* capture filter */
 770         get_filter_arguments(capture_opts, optarg_str_p);
 771         break;
 772     case 'g':        /* enable group read access on the capture file(s) */
 773         capture_opts->group_read_access = TRUE;
 774         break;
 775     case 'H':        /* Hide capture info dialog box */
 776         capture_opts->show_info = FALSE;
 777         break;
 778     case 'i':        /* Use interface x */
 779         status = capture_opts_add_iface_opt(capture_opts, optarg_str_p);
 780         if (status != 0) {
 781             return status;
 782         }
 783         break;
 784 #ifdef HAVE_PCAP_CREATE
 785     case 'I':        /* Capture in monitor mode */
 786         if (capture_opts->ifaces->len > 0) {
 787             interface_options interface_opts;
 788
 789             interface_opts = g_array_index(capture_opts->ifaces, interface_options, capture_opts->ifaces->len - 1);
 790             capture_opts->ifaces = g_array_remove_index(capture_opts->ifaces, capture_opts->ifaces->len - 1);
 791             interface_opts.monitor_mode = TRUE;
 792             g_array_append_val(capture_opts->ifaces, interface_opts);
 793         } else {
 794             capture_opts->default_options.monitor_mode = TRUE;
 795         }
 796         break;
 797 #endif
 798     case 'k':        /* Start capture immediately */
 799         *start_capture = TRUE;
 800         break;
 801     /*case 'l':*/    /* Automatic scrolling in live capture mode */
 802 #ifdef HAVE_PCAP_SETSAMPLING
 803     case 'm':
 804         if (get_sampling_arguments(capture_opts, optarg_str_p) == FALSE) {
 805             cmdarg_err("Invalid or unknown -m arg \"%s\"", optarg_str_p);
 806             return 1;
 807         }
 808         break;
 809 #endif
 810     case 'n':        /* Use pcapng format */
 811         capture_opts->use_pcapng = TRUE;
 812         break;
 813     case 'p':        /* Don't capture in promiscuous mode */
 814         if (capture_opts->ifaces->len > 0) {
 815             interface_options interface_opts;
 816
 817             interface_opts = g_array_index(capture_opts->ifaces, interface_options, capture_opts->ifaces->len - 1);
 818             capture_opts->ifaces = g_array_remove_index(capture_opts->ifaces, capture_opts->ifaces->len - 1);
 819             interface_opts.promisc_mode = FALSE;
 820             g_array_append_val(capture_opts->ifaces, interface_opts);
 821         } else {
 822             capture_opts->default_options.promisc_mode = FALSE;
 823         }
 824         break;
 825     case 'P':        /* Use pcap format */
 826         capture_opts->use_pcapng = FALSE;
 827         break;
 828 #ifdef HAVE_PCAP_REMOTE
 829     case 'r':
 830         if (capture_opts->ifaces->len > 0) {
 831             interface_options interface_opts;
 832
 833             interface_opts = g_array_index(capture_opts->ifaces, interface_options, capture_opts->ifaces->len - 1);
 834             capture_opts->ifaces = g_array_remove_index(capture_opts->ifaces, capture_opts->ifaces->len - 1);
 835             interface_opts.nocap_rpcap = FALSE;
 836             g_array_append_val(capture_opts->ifaces, interface_opts);
 837         } else {
 838             capture_opts->default_options.nocap_rpcap = FALSE;
 839         }
 840         break;
 841 #endif
 842     case 's':        /* Set the snapshot (capture) length */
 843         snaplen = get_natural_int(optarg_str_p, "snapshot length");
 844         /*
 845          * Make a snapshot length of 0 equivalent to the maximum packet
 846          * length, mirroring what tcpdump does.
 847          */
 848         if (snaplen == 0)
 849             snaplen = WTAP_MAX_PACKET_SIZE;
 850         if (capture_opts->ifaces->len > 0) {
 851             interface_options interface_opts;
 852
 853             interface_opts = g_array_index(capture_opts->ifaces, interface_options, capture_opts->ifaces->len - 1);
 854             capture_opts->ifaces = g_array_remove_index(capture_opts->ifaces, capture_opts->ifaces->len - 1);
 855             interface_opts.has_snaplen = TRUE;
 856             interface_opts.snaplen = snaplen;
 857             g_array_append_val(capture_opts->ifaces, interface_opts);
 858         } else {
 859             capture_opts->default_options.snaplen = snaplen;
 860             capture_opts->default_options.has_snaplen = TRUE;
 861         }
 862         break;
 863     case 'S':        /* "Real-Time" mode: used for following file ala tail -f */
 864         capture_opts->real_time_mode = TRUE;
 865         break;
 866 #ifdef HAVE_PCAP_REMOTE
 867     case 'u':
 868         if (capture_opts->ifaces->len > 0) {
 869             interface_options interface_opts;
 870
 871             interface_opts = g_array_index(capture_opts->ifaces, interface_options, capture_opts->ifaces->len - 1);
 872             capture_opts->ifaces = g_array_remove_index(capture_opts->ifaces, capture_opts->ifaces->len - 1);
 873             interface_opts.datatx_udp = TRUE;
 874             g_array_append_val(capture_opts->ifaces, interface_opts);
 875         } else {
 876             capture_opts->default_options.datatx_udp = TRUE;
 877         }
 878         break;
 879 #endif
 880     case 'w':        /* Write to capture file x */
 881         capture_opts->saving_to_file = TRUE;
 882         g_free(capture_opts->save_file);
 883         capture_opts->save_file = g_strdup(optarg_str_p);
 884         status = capture_opts_output_to_pipe(capture_opts->save_file, &capture_opts->output_to_pipe);
 885         return status;
 886     case 'y':        /* Set the pcap data link type */
 887         if (capture_opts->ifaces->len > 0) {
 888             interface_options interface_opts;
 889
 890             interface_opts = g_array_index(capture_opts->ifaces, interface_options, capture_opts->ifaces->len - 1);
 891             capture_opts->ifaces = g_array_remove_index(capture_opts->ifaces, capture_opts->ifaces->len - 1);
 892             interface_opts.linktype = linktype_name_to_val(optarg_str_p);
 893             if (interface_opts.linktype == -1) {
 894                 cmdarg_err("The specified data link type \"%s\" isn't valid",
 895                            optarg_str_p);
 896                 return 1;
 897             }
 898             g_array_append_val(capture_opts->ifaces, interface_opts);
 899         } else {
 900             capture_opts->default_options.linktype = linktype_name_to_val(optarg_str_p);
 901             if (capture_opts->default_options.linktype == -1) {
 902                 cmdarg_err("The specified data link type \"%s\" isn't valid",
 903                            optarg_str_p);
 904                 return 1;
 905             }
 906         }
 907         break;
 908     default:
 909         /* the caller is responsible to send us only the right opt's */
 910         g_assert_not_reached();
 911     }
 912
 913     return 0;
 914 }
 915
 916 void
 917 capture_opts_print_if_capabilities(if_capabilities_t *caps, char *name,
 918                                    gboolean monitor_mode)
 919 {
 920     GList *lt_entry;
 921     data_link_info_t *data_link_info;
 922
 923     if (caps->can_set_rfmon)
 924         printf("Data link types of interface %s when %sin monitor mode (use option -y to set):\n",
 925                name, monitor_mode ? "" : "not ");
 926     else
 927         printf("Data link types of interface %s (use option -y to set):\n", name);
 928     for (lt_entry = caps->data_link_types; lt_entry != NULL;
 929          lt_entry = g_list_next(lt_entry)) {
 930         data_link_info = (data_link_info_t *)lt_entry->data;
 931         printf("  %s", data_link_info->name);
 932         if (data_link_info->description != NULL)
 933             printf(" (%s)", data_link_info->description);
 934         else
 935             printf(" (not supported)");
 936         printf("\n");
 937     }
 938 }
 939
 940 /* Print an ASCII-formatted list of interfaces. */
 941 void
 942 capture_opts_print_interfaces(GList *if_list)
 943 {
 944     int         i;
 945     GList       *if_entry;
 946     if_info_t   *if_info;
 947
 948     i = 1;  /* Interface id number */
 949     for (if_entry = g_list_first(if_list); if_entry != NULL;
 950          if_entry = g_list_next(if_entry)) {
 951         if_info = (if_info_t *)if_entry->data;
 952         printf("%d. %s", i++, if_info->name);
 953
 954         /* Print the interface friendly name, if it exists;
 955           if not fall back to vendor description, if it exists. */
 956         if (if_info->friendly_name != NULL){
 957             printf(" (%s)", if_info->friendly_name);
 958         } else {
 959             if (if_info->vendor_description != NULL)
 960                 printf(" (%s)", if_info->vendor_description);
 961         }
 962         printf("\n");
 963     }
 964 }
 965
 966
 967 void
 968 capture_opts_trim_snaplen(capture_options *capture_opts, int snaplen_min)
 969 {
 970     guint i;
 971     interface_options interface_opts;
 972
 973     if (capture_opts->ifaces->len > 0) {
 974         for (i = 0; i < capture_opts->ifaces->len; i++) {
 975             interface_opts = g_array_index(capture_opts->ifaces, interface_options, 0);
 976             capture_opts->ifaces = g_array_remove_index(capture_opts->ifaces, 0);
 977             if (interface_opts.snaplen < 1)
 978                 interface_opts.snaplen = WTAP_MAX_PACKET_SIZE;
 979             else if (interface_opts.snaplen < snaplen_min)
 980                 interface_opts.snaplen = snaplen_min;
 981             g_array_append_val(capture_opts->ifaces, interface_opts);
 982         }
 983     } else {
 984         if (capture_opts->default_options.snaplen < 1)
 985             capture_opts->default_options.snaplen = WTAP_MAX_PACKET_SIZE;
 986         else if (capture_opts->default_options.snaplen < snaplen_min)
 987             capture_opts->default_options.snaplen = snaplen_min;
 988     }
 989 }
 990
 991
 992 void
 993 capture_opts_trim_ring_num_files(capture_options *capture_opts)
 994 {
 995     /* Check the value range of the ring_num_files parameter */
 996     if (capture_opts->ring_num_files > RINGBUFFER_MAX_NUM_FILES) {
 997         cmdarg_err("Too many ring buffer files (%u). Reducing to %u.\n", capture_opts->ring_num_files, RINGBUFFER_MAX_NUM_FILES);
 998         capture_opts->ring_num_files = RINGBUFFER_MAX_NUM_FILES;
 999     } else if (capture_opts->ring_num_files > RINGBUFFER_WARN_NUM_FILES) {
1000         cmdarg_err("%u is a lot of ring buffer files.\n", capture_opts->ring_num_files);
1001     }
1002 #if RINGBUFFER_MIN_NUM_FILES > 0
1003     else if (capture_opts->ring_num_files < RINGBUFFER_MIN_NUM_FILES)
1004         cmdarg_err("Too few ring buffer files (%u). Increasing to %u.\n", capture_opts->ring_num_files, RINGBUFFER_MIN_NUM_FILES);
1005         capture_opts->ring_num_files = RINGBUFFER_MIN_NUM_FILES;
1006 #endif
1007 }
1008
1009 /*
1010  * If no interface was specified explicitly, pick a default.
1011  */
1012 int
1013 capture_opts_default_iface_if_necessary(capture_options *capture_opts,
1014                                         const char *capture_device)
1015 {
1016     int status;
1017
1018     /* Did the user specify an interface to use? */
1019     if (capture_opts->num_selected != 0 || capture_opts->ifaces->len != 0) {
1020         /* yes they did, return immediately - nothing further to do here */
1021         return 0;
1022     }
1023
1024     /* No - is a default specified in the preferences file? */
1025     if (capture_device != NULL) {
1026         /* Yes - use it. */
1027         status = capture_opts_add_iface_opt(capture_opts, capture_device);
1028         return status;
1029     }
1030     /* No default in preferences file, just pick the first interface from the list of interfaces. */
1031     return capture_opts_add_iface_opt(capture_opts, "1");
1032 }
1033
1034 #ifndef S_IFIFO
1035 #define S_IFIFO _S_IFIFO
1036 #endif
1037 #ifndef S_ISFIFO
1038 #define S_ISFIFO(mode)  (((mode) & S_IFMT) == S_IFIFO)
1039 #endif
1040
1041 /* copied from filesystem.c */
1042 static int
1043 capture_opts_test_for_fifo(const char *path)
1044 {
1045     ws_statb64 statb;
1046
1047     if (ws_stat64(path, &statb) < 0)
1048         return errno;
1049
1050     if (S_ISFIFO(statb.st_mode))
1051         return ESPIPE;
1052     else
1053         return 0;
1054 }
1055
1056 static gboolean
1057 capture_opts_output_to_pipe(const char *save_file, gboolean *is_pipe)
1058 {
1059     int err;
1060
1061     *is_pipe = FALSE;
1062
1063     if (save_file != NULL) {
1064         /* We're writing to a capture file. */
1065         if (strcmp(save_file, "-") == 0) {
1066             /* Writing to stdout. */
1067             /* XXX - should we check whether it's a pipe?  It's arguably
1068                silly to do "-w - >output_file" rather than "-w output_file",
1069                but by not checking we might be violating the Principle Of
1070                Least Astonishment. */
1071             *is_pipe = TRUE;
1072         } else {
1073             /* not writing to stdout, test for a FIFO (aka named pipe) */
1074             err = capture_opts_test_for_fifo(save_file);
1075             switch (err) {
1076
1077             case ENOENT:      /* it doesn't exist, so we'll be creating it,
1078                                  and it won't be a FIFO */
1079             case 0:           /* found it, but it's not a FIFO */
1080                 break;
1081
1082             case ESPIPE:      /* it is a FIFO */
1083                 *is_pipe = TRUE;
1084                 break;
1085
1086             default:          /* couldn't stat it              */
1087                 break;          /* ignore: later attempt to open */
1088                 /*  will generate a nice msg     */
1089             }
1090         }
1091     }
1092
1093     return 0;
1094 }
1095
1096 void
1097 capture_opts_del_iface(capture_options *capture_opts, guint if_index)
1098 {
1099     interface_options interface_opts;
1100
1101     interface_opts = g_array_index(capture_opts->ifaces, interface_options, if_index);
1102     /* XXX - check if found? */
1103
1104     g_free(interface_opts.name);
1105     g_free(interface_opts.descr);
1106     if (interface_opts.console_display_name != NULL)
1107         g_free(interface_opts.console_display_name);
1108     g_free(interface_opts.cfilter);
1109 #ifdef HAVE_EXTCAP
1110     g_free(interface_opts.extcap);
1111     g_free(interface_opts.extcap_fifo);
1112     if (interface_opts.extcap_args)
1113         g_hash_table_unref(interface_opts.extcap_args);
1114     if (interface_opts.extcap_pid != INVALID_EXTCAP_PID)
1115         g_spawn_close_pid(interface_opts.extcap_pid);
1116 #endif
1117 #ifdef HAVE_PCAP_REMOTE
1118     if (interface_opts.src_type == CAPTURE_IFREMOTE) {
1119         g_free(interface_opts.remote_host);
1120         g_free(interface_opts.remote_port);
1121         g_free(interface_opts.auth_username);
1122         g_free(interface_opts.auth_password);
1123     }
1124 #endif
1125     capture_opts->ifaces = g_array_remove_index(capture_opts->ifaces, if_index);
1126 }
1127
1128
1129
1130 /*
1131  * Add all non-hidden selected interfaces in the "all interfaces" list
1132  * to the list of interfaces for the capture.
1133  */
1134 void
1135 collect_ifaces(capture_options *capture_opts)
1136 {
1137     guint i;
1138     interface_t device;
1139     interface_options interface_opts;
1140
1141     /* Empty out the existing list of interfaces. */
1142     for (i = capture_opts->ifaces->len; i != 0; i--)
1143         capture_opts_del_iface(capture_opts, i-1);
1144
1145     /* Now fill the list up again. */
1146     for (i = 0; i < capture_opts->all_ifaces->len; i++) {
1147         device = g_array_index(capture_opts->all_ifaces, interface_t, i);
1148         if (!device.hidden && device.selected) {
1149             interface_opts.name = g_strdup(device.name);
1150             interface_opts.descr = g_strdup(device.display_name);
1151             interface_opts.console_display_name = g_strdup(device.name);
1152             interface_opts.linktype = device.active_dlt;
1153             interface_opts.cfilter = g_strdup(device.cfilter);
1154             interface_opts.snaplen = device.snaplen;
1155             interface_opts.has_snaplen = device.has_snaplen;
1156             interface_opts.promisc_mode = device.pmode;
1157             interface_opts.if_type = device.if_info.type;
1158 #ifdef HAVE_EXTCAP
1159             interface_opts.extcap = g_strdup(device.if_info.extcap);
1160             interface_opts.extcap_fifo = NULL;
1161             interface_opts.extcap_args = device.external_cap_args_settings;
1162             interface_opts.extcap_pid = INVALID_EXTCAP_PID;
1163             if (interface_opts.extcap_args)
1164                 g_hash_table_ref(interface_opts.extcap_args);
1165 #endif
1166 #ifdef CAN_SET_CAPTURE_BUFFER_SIZE
1167             interface_opts.buffer_size =  device.buffer;
1168 #endif
1169 #ifdef HAVE_PCAP_CREATE
1170             interface_opts.monitor_mode = device.monitor_mode_enabled;
1171 #endif
1172 #ifdef HAVE_PCAP_REMOTE
1173             interface_opts.src_type = CAPTURE_IFREMOTE;
1174             interface_opts.remote_host = g_strdup(device.remote_opts.remote_host_opts.remote_host);
1175             interface_opts.remote_port = g_strdup(device.remote_opts.remote_host_opts.remote_port);
1176             interface_opts.auth_type = device.remote_opts.remote_host_opts.auth_type;
1177             interface_opts.auth_username = g_strdup(device.remote_opts.remote_host_opts.auth_username);
1178             interface_opts.auth_password = g_strdup(device.remote_opts.remote_host_opts.auth_password);
1179             interface_opts.datatx_udp = device.remote_opts.remote_host_opts.datatx_udp;
1180             interface_opts.nocap_rpcap = device.remote_opts.remote_host_opts.nocap_rpcap;
1181             interface_opts.nocap_local = device.remote_opts.remote_host_opts.nocap_local;
1182 #endif
1183 #ifdef HAVE_PCAP_SETSAMPLING
1184             interface_opts.sampling_method = device.remote_opts.sampling_method;
1185             interface_opts.sampling_param  = device.remote_opts.sampling_param;
1186 #endif
1187             g_array_append_val(capture_opts->ifaces, interface_opts);
1188         } else {
1189             continue;
1190         }
1191     }
1192 }
1193
1194 static void
1195 capture_opts_free_interface_t_links(gpointer elem, gpointer unused _U_)
1196 {
1197     link_row* e = (link_row*)elem;
1198     if (e != NULL)
1199         g_free(e->name);
1200     g_free(elem);
1201 }
1202
1203 static void
1204 capture_opts_free_interface_t_addrs(gpointer elem, gpointer unused _U_)
1205 {
1206     g_free(elem);
1207 }
1208
1209 void
1210 capture_opts_free_interface_t(interface_t *device)
1211 {
1212     if (device != NULL) {
1213         g_free(device->name);
1214         g_free(device->display_name);
1215         g_free(device->friendly_name);
1216         g_free(device->addresses);
1217         g_free(device->cfilter);
1218         g_list_foreach(device->links,
1219                        capture_opts_free_interface_t_links, NULL);
1220         g_list_free(device->links);
1221 #ifdef HAVE_PCAP_REMOTE
1222         g_free(device->remote_opts.remote_host_opts.remote_host);
1223         g_free(device->remote_opts.remote_host_opts.remote_port);
1224         g_free(device->remote_opts.remote_host_opts.auth_username);
1225         g_free(device->remote_opts.remote_host_opts.auth_password);
1226 #endif
1227         g_free(device->if_info.name);
1228         g_free(device->if_info.friendly_name);
1229         g_free(device->if_info.vendor_description);
1230         g_slist_foreach(device->if_info.addrs,
1231                         capture_opts_free_interface_t_addrs, NULL);
1232         g_slist_free(device->if_info.addrs);
1233 #ifdef HAVE_EXTCAP
1234         g_free(device->if_info.extcap);
1235 #endif
1236     }
1237 }
1238
1239 #endif /* HAVE_LIBPCAP */
1240
1241 /*
1242  * Editor modelines  -  http://www.wireshark.org/tools/modelines.html
1243  *
1244  * Local variables:
1245  * c-basic-offset: 4
1246  * tab-width: 8
1247  * indent-tabs-mode: nil
1248  * End:
1249  *
1250  * vi: set shiftwidth=4 tabstop=8 expandtab:
1251  * :indentSize=4:tabSize=8:noTabs=true:
1252  */