extcap.c

   1 /* extcap.h
   2  *
   3  * Routines for extcap external capture
   4  * Copyright 2013, Mike Ryan <mikeryan@lacklustre.net>
   5  *
   6  * Wireshark - Network traffic analyzer
   7  * By Gerald Combs <gerald@wireshark.org>
   8  * Copyright 1998 Gerald Combs
   9  *
  10  * This program is free software; you can redistribute it and/or
  11  * modify it under the terms of the GNU General Public License
  12  * as published by the Free Software Foundation; either version 2
  13  * of the License, or (at your option) any later version.
  14  *
  15  * This program is distributed in the hope that it will be useful,
  16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18  * GNU General Public License for more details.
  19  *
  20  * You should have received a copy of the GNU General Public License
  21  * along with this program; if not, write to the Free Software
  22  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  23  */
  24
  25 #include <config.h>
  26
  27 #include <stdio.h>
  28 #include <stdlib.h>
  29 #include <string.h>
  30
  31 #ifdef _WIN32
  32 #include <windows.h>
  33 #include <process.h>
  34 #include <time.h>
  35 #else
  36 /* Include for unlink */
  37 #include <unistd.h>
  38 #endif
  39
  40 #include <glib.h>
  41 #include <log.h>
  42
  43 #include <wsutil/file_util.h>
  44 #include <wsutil/filesystem.h>
  45 #include <wsutil/tempfile.h>
  46
  47 #include "capture_opts.h"
  48
  49 #ifdef HAVE_EXTCAP
  50
  51 #include "extcap.h"
  52 #include "extcap_parser.h"
  53
  54 #ifdef _WIN32
  55 static HANDLE pipe_h = NULL;
  56 #endif
  57
  58 /* internal container, for all the extcap interfaces that have been found.
  59  * will be resetted by every call to extcap_interface_list() and is being
  60  * used in extcap_get_if_* as well as extcap_init_interfaces to ensure,
  61  * that only extcap interfaces are being given to underlying extcap programs
  62  */
  63 static GHashTable *ifaces = NULL;
  64
  65 /* Callback definition for extcap_foreach */
  66 typedef gboolean (*extcap_cb_t)(const gchar *extcap, gchar *output, void *data,
  67         gchar **err_str);
  68
  69 /* #define ARG_DEBUG */
  70 #if ARG_DEBUG
  71 static void extcap_debug_arguments ( extcap_arg *arg_iter );
  72 #endif
  73
  74 static gboolean
  75 extcap_if_exists(const char *ifname)
  76 {
  77     if ( ifname != NULL )
  78     {
  79         if ( ifaces != NULL )
  80         {
  81             if ( g_hash_table_size(ifaces) > 0 )
  82             {
  83                 if ( g_hash_table_lookup(ifaces, (const gchar *)ifname) != NULL )
  84                 {
  85                     return TRUE;
  86                 }
  87             }
  88         }
  89     }
  90     return FALSE;
  91 }
  92
  93 static gboolean
  94 extcap_if_exists_for_extcap(const char *ifname, const char *extcap)
  95 {
  96     gchar * entry = NULL;
  97
  98     if ( extcap_if_exists(ifname) )
  99     {
 100         if ( ( entry = (gchar *)g_hash_table_lookup(ifaces, (const gchar *)ifname) ) != NULL )
 101         {
 102             if ( strcmp(entry, extcap) == 0 )
 103                 return TRUE;
 104         }
 105     }
 106
 107     return FALSE;
 108 }
 109
 110 static gchar *
 111 extcap_if_executable(const char *ifname)
 112 {
 113     if ( extcap_if_exists(ifname) )
 114         return (gchar *)g_hash_table_lookup(ifaces, (const gchar *)ifname);
 115
 116     return (gchar *)NULL;
 117 }
 118
 119 static void
 120 extcap_if_reset(void)
 121 {
 122     if (ifaces == NULL)
 123         ifaces = g_hash_table_new_full(g_str_hash, g_str_equal, g_free, g_free);
 124
 125     g_hash_table_remove_all(ifaces);
 126 }
 127
 128 static void
 129 extcap_if_add(gchar *ifname, gchar *extcap)
 130 {
 131     if ( g_hash_table_lookup(ifaces, ifname) == NULL )
 132         g_hash_table_insert(ifaces, ifname, extcap);
 133     else {
 134         g_free(ifname);
 135         g_free(extcap);
 136     }
 137 }
 138
 139 /* Note: args does not need to be NULL-terminated. */
 140 static void extcap_foreach(gint argc, gchar **args, extcap_cb_t cb,
 141         void *cb_data, char **err_str, const char * ifname _U_) {
 142     const char *dirname = get_extcap_dir();
 143     GDir *dir;
 144     const gchar *file;
 145     gboolean keep_going;
 146     gint i;
 147     gchar **argv;
 148 #ifdef _WIN32
 149     gchar **dll_search_envp;
 150     gchar *progfile_dir;
 151 #endif
 152
 153     keep_going = TRUE;
 154
 155     argv = (gchar **) g_malloc0(sizeof(gchar *) * (argc + 2));
 156
 157 #ifdef _WIN32
 158     /*
 159      * Make sure executables can find dependent DLLs and that they're *our*
 160      * DLLs: https://msdn.microsoft.com/en-us/library/windows/desktop/ms682586.aspx
 161      * Alternatively we could create a simple wrapper exe similar to Create
 162      * Hidden Process (http://www.commandline.co.uk/chp/).
 163      */
 164     dll_search_envp = g_get_environ();
 165     progfile_dir = g_strdup_printf("%s;%s", get_progfile_dir(), g_environ_getenv(dll_search_envp, "Path"));
 166     dll_search_envp = g_environ_setenv(dll_search_envp, "Path", progfile_dir, TRUE);
 167     g_free(progfile_dir);
 168 #endif
 169
 170     if ((dir = g_dir_open(dirname, 0, NULL)) != NULL) {
 171         GString *extcap_path = NULL;
 172
 173         extcap_path = g_string_new("");
 174         while (keep_going && (file = g_dir_read_name(dir)) != NULL ) {
 175             gchar *command_output = NULL;
 176             gboolean status = FALSE;
 177             gint exit_status = 0;
 178             GError *error = NULL;
 179             gchar **envp = NULL;
 180
 181             /* full path to extcap binary */
 182 #ifdef _WIN32
 183             g_string_printf(extcap_path, "%s\\%s", dirname, file);
 184             envp = dll_search_envp;
 185 #else
 186             g_string_printf(extcap_path, "%s/%s", dirname, file);
 187 #endif
 188             if ( extcap_if_exists(ifname) && !extcap_if_exists_for_extcap(ifname, extcap_path->str ) )
 189                 continue;
 190
 191 #ifdef _WIN32
 192             argv[0] = g_strescape(extcap_path->str, NULL);
 193 #else
 194             argv[0] = g_strdup(extcap_path->str);
 195 #endif
 196             for (i = 0; i < argc; ++i)
 197                 argv[i+1] = args[i];
 198             argv[argc+1] = NULL;
 199
 200             status = g_spawn_sync(dirname, argv, envp,
 201                 (GSpawnFlags) 0, NULL, NULL,
 202                     &command_output, NULL, &exit_status, &error);
 203
 204             if (status && exit_status == 0)
 205             keep_going = cb(extcap_path->str, command_output, cb_data, err_str);
 206
 207             g_free(argv[0]);
 208             g_free(command_output);
 209         }
 210
 211         g_dir_close(dir);
 212         g_string_free(extcap_path, TRUE);
 213     }
 214
 215 #ifdef _WIN32
 216     g_strfreev(dll_search_envp);
 217 #endif
 218     g_free(argv);
 219 }
 220
 221 static gboolean dlt_cb(const gchar *extcap _U_, gchar *output, void *data,
 222         char **err_str) {
 223     extcap_token_sentence *tokens;
 224     extcap_dlt *dlts, *dlt_iter, *next;
 225     if_capabilities_t *caps;
 226     GList *linktype_list = NULL;
 227     data_link_info_t *data_link_info;
 228
 229     tokens = extcap_tokenize_sentences(output);
 230     extcap_parse_dlts(tokens, &dlts);
 231
 232     extcap_free_tokenized_sentence_list(tokens);
 233
 234     g_log(LOG_DOMAIN_CAPTURE, G_LOG_LEVEL_DEBUG, "Extcap pipe %s ", extcap);
 235
 236     /*
 237      * Allocate the interface capabilities structure.
 238      */
 239     caps = (if_capabilities_t *) g_malloc(sizeof *caps);
 240     caps->can_set_rfmon = FALSE;
 241
 242     dlt_iter = dlts;
 243     while (dlt_iter != NULL ) {
 244         g_log(LOG_DOMAIN_CAPTURE, G_LOG_LEVEL_DEBUG,
 245                 "  DLT %d name=\"%s\" display=\"%s\" ", dlt_iter->number,
 246                 dlt_iter->name, dlt_iter->display);
 247
 248         data_link_info = g_new(data_link_info_t, 1);
 249         data_link_info->dlt = dlt_iter->number;
 250         data_link_info->name = g_strdup(dlt_iter->name);
 251         data_link_info->description = g_strdup(dlt_iter->display);
 252         linktype_list = g_list_append(linktype_list, data_link_info);
 253         dlt_iter = dlt_iter->next_dlt;
 254     }
 255
 256     /* Check to see if we built a list */
 257     if (linktype_list != NULL && data != NULL) {
 258         caps->data_link_types = linktype_list;
 259         *(if_capabilities_t **) data = caps;
 260     } else {
 261         if (err_str) {
 262             g_log(LOG_DOMAIN_CAPTURE, G_LOG_LEVEL_DEBUG, "  returned no DLTs");
 263             *err_str = g_strdup("Extcap returned no DLTs");
 264         }
 265         g_free(caps);
 266     }
 267
 268     dlt_iter = dlts;
 269     while (dlt_iter != NULL ) {
 270         next = dlt_iter->next_dlt;
 271         extcap_free_dlt(dlt_iter);
 272         dlt_iter = next;
 273     }
 274
 275     return FALSE;
 276 }
 277
 278 if_capabilities_t *
 279 extcap_get_if_dlts(const gchar *ifname, char **err_str) {
 280     gchar *argv[3];
 281     gint i;
 282     if_capabilities_t *caps = NULL;
 283
 284     if (ifname != NULL && err_str != NULL)
 285         *err_str = NULL;
 286
 287     if ( extcap_if_exists(ifname) )
 288     {
 289         argv[0] = g_strdup(EXTCAP_ARGUMENT_LIST_DLTS);
 290         argv[1] = g_strdup(EXTCAP_ARGUMENT_INTERFACE);
 291         argv[2] = g_strdup(ifname);
 292
 293         if (err_str)
 294             *err_str = NULL;
 295         extcap_foreach(3, argv, dlt_cb, &caps, err_str, ifname);
 296
 297         for (i = 0; i < 3; ++i)
 298             g_free(argv[i]);
 299     }
 300
 301     return caps;
 302 }
 303
 304 static gboolean interfaces_cb(const gchar *extcap, gchar *output, void *data,
 305         char **err_str _U_) {
 306     GList **il = (GList **) data;
 307     extcap_token_sentence *tokens;
 308     extcap_interface *interfaces, *int_iter; /*, *next; */
 309     if_info_t *if_info;
 310
 311     tokens = extcap_tokenize_sentences(output);
 312     extcap_parse_interfaces(tokens, &interfaces);
 313
 314     extcap_free_tokenized_sentence_list(tokens);
 315
 316     g_log(LOG_DOMAIN_CAPTURE, G_LOG_LEVEL_DEBUG, "Extcap pipe %s ", extcap);
 317
 318     int_iter = interfaces;
 319     while (int_iter != NULL ) {
 320         if ( extcap_if_exists(int_iter->call) )
 321         {
 322             g_log(LOG_DOMAIN_CAPTURE, G_LOG_LEVEL_WARNING, "Extcap interface \"%s\" is already provided by \"%s\" ",
 323                     int_iter->call, (gchar *)extcap_if_executable(int_iter->call) );
 324             int_iter = int_iter->next_interface;
 325             continue;
 326         }
 327
 328         g_log(LOG_DOMAIN_CAPTURE, G_LOG_LEVEL_DEBUG, "  Interface [%s] \"%s\" ",
 329                 int_iter->call, int_iter->display);
 330
 331         if_info = g_new0(if_info_t, 1);
 332         if_info->name = g_strdup(int_iter->call);
 333         if_info->friendly_name = g_strdup(int_iter->display);
 334
 335         if_info->type = IF_EXTCAP;
 336
 337         if_info->extcap = g_strdup(extcap);
 338         *il = g_list_append(*il, if_info);
 339
 340         extcap_if_add(g_strdup(int_iter->call), g_strdup(extcap) );
 341         int_iter = int_iter->next_interface;
 342     }
 343     extcap_free_interface(interfaces);
 344
 345     return TRUE;
 346 }
 347
 348 static gint
 349 if_info_compare(gconstpointer a, gconstpointer b)
 350 {
 351     gint comp = 0;
 352     if_info_t * if_a = (if_info_t *)a;
 353     if_info_t * if_b = (if_info_t *)b;
 354
 355     if ( (comp = g_strcmp0(if_a->name, if_b->name)) == 0 )
 356         return g_strcmp0(if_a->friendly_name, if_b->friendly_name);
 357
 358     return comp;
 359 }
 360
 361 GList *
 362 extcap_interface_list(char **err_str) {
 363     gchar *argv;
 364     /* gint i; */
 365     GList *ret = NULL;
 366
 367     if (err_str != NULL)
 368     *err_str = NULL;
 369
 370     /* ifaces is used as cache, do not destroy its contents when
 371      * returning or no extcap interfaces can be queried for options */
 372     extcap_if_reset();
 373
 374     argv = g_strdup(EXTCAP_ARGUMENT_LIST_INTERFACES);
 375
 376     if (err_str)
 377     *err_str = NULL;
 378     extcap_foreach(1, &argv, interfaces_cb, &ret, err_str, NULL);
 379
 380     g_free(argv);
 381
 382     return g_list_sort ( ret, if_info_compare );
 383 }
 384
 385 static void extcap_free_if_configuration(GList *list)
 386 {
 387     GList *elem;
 388
 389     for (elem = g_list_first(list); elem; elem = elem->next)
 390     {
 391         if (elem->data != NULL)
 392             g_list_free_full(g_list_first((GList *)elem->data), g_free);
 393     }
 394     g_list_free(list);
 395 }
 396
 397 static gboolean search_cb(const gchar *extcap _U_, gchar *output, void *data,
 398         char **err_str _U_) {
 399     extcap_token_sentence *tokens = NULL;
 400     GList *arguments = NULL;
 401     GList **il = (GList **) data;
 402
 403     tokens = extcap_tokenize_sentences(output);
 404     arguments = extcap_parse_args(tokens);
 405
 406     extcap_free_tokenized_sentence_list(tokens);
 407
 408 #if ARG_DEBUG
 409     extcap_debug_arguments ( arguments );
 410 #endif
 411
 412     *il = g_list_append(*il, arguments);
 413
 414     /* By returning false, extcap_foreach will break on first found */
 415     return TRUE;
 416 }
 417
 418 GList *
 419 extcap_get_if_configuration(const char * ifname) {
 420     gchar *argv[3];
 421     GList *ret = NULL;
 422     gchar **err_str = NULL;
 423     int i;
 424
 425     if ( extcap_if_exists(ifname) )
 426     {
 427         g_log(LOG_DOMAIN_CAPTURE, G_LOG_LEVEL_DEBUG, "Extcap path %s",
 428                 get_extcap_dir());
 429
 430         argv[0] = g_strdup(EXTCAP_ARGUMENT_CONFIG);
 431         argv[1] = g_strdup(EXTCAP_ARGUMENT_INTERFACE);
 432         argv[2] = g_strdup(ifname);
 433
 434         extcap_foreach(3, argv, search_cb, &ret, err_str, ifname);
 435
 436         for (i = 0; i < 3; i++)
 437             g_free(argv[i]);
 438     }
 439
 440     return ret;
 441 }
 442
 443 gboolean
 444 extcap_has_configuration(const char * ifname, gboolean is_required) {
 445     GList * arguments = 0;
 446     GList * walker = 0, * item = 0;
 447
 448     gboolean found = FALSE;
 449
 450     arguments = extcap_get_if_configuration((const char *)( ifname ) );
 451     walker = g_list_first(arguments);
 452
 453     while ( walker != NULL && ! found )
 454     {
 455         item = g_list_first((GList *)(walker->data));
 456         while ( item != NULL && ! found )
 457         {
 458             if ( (extcap_arg *)(item->data) != NULL )
 459             {
 460                 /* Should required options be present, or any kind of options */
 461                 if ( ! is_required || ((extcap_arg *)(item->data))->is_required )
 462                     found = TRUE;
 463             }
 464
 465             item = item->next;
 466         }
 467         walker = walker->next;
 468     }
 469
 470     return found;
 471 }
 472
 473 void extcap_cleanup(capture_options * capture_opts) {
 474     interface_options interface_opts;
 475     guint icnt = 0;
 476
 477     for (icnt = 0; icnt < capture_opts->ifaces->len; icnt++) {
 478         interface_opts = g_array_index(capture_opts->ifaces, interface_options,
 479                 icnt);
 480
 481         /* skip native interfaces */
 482         if (interface_opts.if_type != IF_EXTCAP)
 483         continue;
 484
 485         g_log(LOG_DOMAIN_CAPTURE, G_LOG_LEVEL_DEBUG,
 486                 "Extcap [%s] - Cleaning up fifo: %s; PID: %d", interface_opts.name,
 487                 interface_opts.extcap_fifo, interface_opts.extcap_pid);
 488 #ifdef _WIN32
 489         if (pipe_h)
 490         {
 491             g_log(LOG_DOMAIN_CAPTURE, G_LOG_LEVEL_DEBUG,
 492                 "Extcap [%s] - Closing pipe", interface_opts.name);
 493             FlushFileBuffers(pipe_h);
 494             DisconnectNamedPipe(pipe_h);
 495             CloseHandle(pipe_h);
 496         }
 497 #else
 498         if (interface_opts.extcap_fifo != NULL && file_exists(interface_opts.extcap_fifo))
 499         {
 500             /* the fifo will not be freed here, but with the other capture_opts in capture_sync */
 501             ws_unlink(interface_opts.extcap_fifo);
 502             interface_opts.extcap_fifo = NULL;
 503         }
 504 #endif
 505         /* Maybe the client closed and removed fifo, but ws should check if
 506          * pid should be closed */
 507         g_log(LOG_DOMAIN_CAPTURE, G_LOG_LEVEL_DEBUG,
 508                 "Extcap [%s] - Closing spawned PID: %d", interface_opts.name,
 509                 interface_opts.extcap_pid);
 510
 511         if (interface_opts.extcap_child_watch > 0)
 512         {
 513             g_source_remove(interface_opts.extcap_child_watch);
 514             interface_opts.extcap_child_watch = 0;
 515         }
 516
 517         if (interface_opts.extcap_pid != INVALID_EXTCAP_PID)
 518         {
 519 #ifdef _WIN32
 520             TerminateProcess(interface_opts.extcap_pid, 0);
 521 #endif
 522             g_spawn_close_pid(interface_opts.extcap_pid);
 523             interface_opts.extcap_pid = INVALID_EXTCAP_PID;
 524         }
 525
 526         /* Make sure modified interface_opts is saved in capture_opts. */
 527         capture_opts->ifaces = g_array_remove_index(capture_opts->ifaces, icnt);
 528         g_array_insert_val(capture_opts->ifaces, icnt, interface_opts);
 529     }
 530 }
 531
 532 static void
 533 extcap_arg_cb(gpointer key, gpointer value, gpointer data) {
 534     GPtrArray *args = (GPtrArray *)data;
 535
 536     if ( key != NULL )
 537     {
 538         g_ptr_array_add(args, g_strdup((const gchar*)key));
 539
 540         if ( value != NULL )
 541             g_ptr_array_add(args, g_strdup((const gchar*)value));
 542     }
 543 }
 544
 545 static void extcap_child_watch_cb(GPid pid, gint status _U_, gpointer user_data)
 546 {
 547     guint i;
 548     interface_options interface_opts;
 549     capture_options *capture_opts = (capture_options *)user_data;
 550
 551     /* Close handle to child process. */
 552     g_spawn_close_pid(pid);
 553
 554     /* Update extcap_pid in interface options structure. */
 555     for (i = 0; i < capture_opts->ifaces->len; i++)
 556     {
 557         interface_opts = g_array_index(capture_opts->ifaces, interface_options, i);
 558         if (interface_opts.extcap_pid == pid)
 559         {
 560             interface_opts.extcap_pid = INVALID_EXTCAP_PID;
 561             interface_opts.extcap_child_watch = 0;
 562             capture_opts->ifaces = g_array_remove_index(capture_opts->ifaces, i);
 563             g_array_insert_val(capture_opts->ifaces, i, interface_opts);
 564             break;
 565         }
 566     }
 567 }
 568
 569 /* call mkfifo for each extcap,
 570  * returns FALSE if there's an error creating a FIFO */
 571 gboolean
 572 extcap_init_interfaces(capture_options *capture_opts)
 573 {
 574     guint i;
 575     interface_options interface_opts;
 576
 577     for (i = 0; i < capture_opts->ifaces->len; i++)
 578     {
 579         GPtrArray *args = NULL;
 580         GPid pid = INVALID_EXTCAP_PID;
 581         gchar **tmp;
 582         int tmp_i;
 583
 584         interface_opts = g_array_index(capture_opts->ifaces, interface_options, i);
 585
 586         /* skip native interfaces */
 587         if (interface_opts.if_type != IF_EXTCAP )
 588             continue;
 589
 590         /* create pipe for fifo */
 591         if ( ! extcap_create_pipe ( &interface_opts.extcap_fifo ) )
 592             return FALSE;
 593
 594         /* Create extcap call */
 595         args = g_ptr_array_new();
 596 #define add_arg(X) g_ptr_array_add(args, g_strdup(X))
 597
 598         add_arg(interface_opts.extcap);
 599         add_arg(EXTCAP_ARGUMENT_RUN_CAPTURE);
 600         add_arg(EXTCAP_ARGUMENT_INTERFACE);
 601         add_arg(interface_opts.name);
 602         if (interface_opts.cfilter && strlen(interface_opts.cfilter) > 0) {
 603             add_arg(EXTCAP_ARGUMENT_CAPTURE_FILTER);
 604             add_arg(interface_opts.cfilter);
 605         }
 606         add_arg(EXTCAP_ARGUMENT_RUN_PIPE);
 607         add_arg(interface_opts.extcap_fifo);
 608         if (interface_opts.extcap_args == NULL)
 609         {
 610             /* User did not perform interface configuration.
 611              *
 612              * Check if there are any boolean flags that are set by default
 613              * and hence their argument should be added.
 614              */
 615             GList *arglist;
 616             GList *elem;
 617
 618             arglist = extcap_get_if_configuration(interface_opts.name);
 619             for (elem = g_list_first(arglist); elem; elem = elem->next)
 620             {
 621                 GList * arg_list;
 622                 extcap_arg *arg_iter;
 623
 624                 if (elem->data == NULL)
 625                 {
 626                     continue;
 627                 }
 628
 629                 arg_list = g_list_first((GList *)elem->data);
 630                 while (arg_list != NULL)
 631                 {
 632                     /* In case of boolflags only first element in arg_list is relevant. */
 633                     arg_iter = (extcap_arg*) (arg_list->data);
 634
 635                     if  (arg_iter->arg_type == EXTCAP_ARG_BOOLFLAG)
 636                     {
 637                         if (arg_iter->default_complex != NULL
 638                             && extcap_complex_get_bool(arg_iter->default_complex))
 639                         {
 640                             add_arg(arg_iter->call);
 641                         }
 642                     }
 643
 644                     arg_list = arg_list->next;
 645                 }
 646             }
 647
 648             extcap_free_if_configuration(arglist);
 649         }
 650         else
 651         {
 652             g_hash_table_foreach(interface_opts.extcap_args, extcap_arg_cb, args);
 653         }
 654         add_arg(NULL);
 655 #undef add_arg
 656
 657         /* Dump commandline parameters sent to extcap. */
 658         for (tmp = (gchar **)args->pdata, tmp_i = 0; *tmp && **tmp; ++tmp_i, ++tmp)
 659         {
 660             g_log(LOG_DOMAIN_CAPTURE, G_LOG_LEVEL_DEBUG, "argv[%d]: %s", tmp_i, *tmp);
 661         }
 662
 663         /* Wireshark for windows crashes here sometimes *
 664          * Access violation reading location 0x...      */
 665         g_spawn_async(NULL, (gchar **)args->pdata, NULL,
 666                     (GSpawnFlags) G_SPAWN_DO_NOT_REAP_CHILD, NULL, NULL,
 667                     &pid,NULL);
 668
 669         g_ptr_array_foreach(args, (GFunc)g_free, NULL);
 670         g_ptr_array_free(args, TRUE);
 671         interface_opts.extcap_pid = pid;
 672         interface_opts.extcap_child_watch =
 673             g_child_watch_add(pid, extcap_child_watch_cb, (gpointer)capture_opts);
 674         capture_opts->ifaces = g_array_remove_index(capture_opts->ifaces, i);
 675         g_array_insert_val(capture_opts->ifaces, i, interface_opts);
 676
 677 #ifdef _WIN32
 678         /* On Windows, wait for extcap to connect to named pipe.
 679          * Some extcaps will present UAC screen to user.
 680          * 30 second timeout should be reasonable timeout for extcap to
 681          * connect to named pipe (including user interaction).
 682          * Wait on multiple object in case of extcap termination
 683          * without opening pipe.
 684          *
 685          * Minimum supported version of Windows: XP / Server 2003.
 686          */
 687         if (pid != INVALID_EXTCAP_PID)
 688         {
 689             DWORD dw;
 690             HANDLE handles[2];
 691             OVERLAPPED ov;
 692             ov.Pointer = 0;
 693             ov.hEvent = CreateEvent(NULL, TRUE, FALSE, NULL);
 694
 695             ConnectNamedPipe(pipe_h, &ov);
 696             handles[0] = ov.hEvent;
 697             handles[1] = pid;
 698
 699             if (GetLastError() == ERROR_PIPE_CONNECTED)
 700             {
 701                 g_log(LOG_DOMAIN_CAPTURE, G_LOG_LEVEL_DEBUG, "extcap connected to pipe");
 702             }
 703             else
 704             {
 705                 dw = WaitForMultipleObjects(2, handles, FALSE, 30000);
 706                 if (dw == WAIT_OBJECT_0)
 707                 {
 708                     /* ConnectNamedPipe finished. */
 709                     DWORD code;
 710
 711                     code = GetLastError();
 712                     if (code == ERROR_IO_PENDING)
 713                     {
 714                         DWORD dummy;
 715                         if (!GetOverlappedResult(ov.hEvent, &ov, &dummy, TRUE))
 716                         {
 717                             code = GetLastError();
 718                         }
 719                         else
 720                         {
 721                             code = ERROR_SUCCESS;
 722                         }
 723                     }
 724
 725                     g_log(LOG_DOMAIN_CAPTURE, G_LOG_LEVEL_DEBUG, "ConnectNamedPipe code: %d", code);
 726                 }
 727                 else if (dw == (WAIT_OBJECT_0 + 1))
 728                 {
 729                     /* extcap process terminated. */
 730                     g_log(LOG_DOMAIN_CAPTURE, G_LOG_LEVEL_DEBUG, "extcap terminated without connecting to pipe!");
 731                 }
 732                 else if (dw == WAIT_TIMEOUT)
 733                 {
 734                     g_log(LOG_DOMAIN_CAPTURE, G_LOG_LEVEL_DEBUG, "extcap didn't connect to pipe within 30 seconds!");
 735                 }
 736                 else
 737                 {
 738                     g_log(LOG_DOMAIN_CAPTURE, G_LOG_LEVEL_DEBUG, "WaitForMultipleObjects returned 0x%08X. Error %d", dw, GetLastError());
 739                 }
 740             }
 741
 742             CloseHandle(ov.hEvent);
 743         }
 744 #endif
 745     }
 746
 747     return TRUE;
 748 }
 749
 750 #ifdef _WIN32
 751 /* called by capture_sync to get the CreatNamedPipe handle*/
 752 HANDLE
 753 extcap_get_win32_handle()
 754 {
 755     return pipe_h;
 756 }
 757 #endif
 758
 759 gboolean extcap_create_pipe(char ** fifo)
 760 {
 761 #ifdef _WIN32
 762     gchar timestr[ 14+1 ];
 763     time_t current_time;
 764
 765     gchar *pipename = NULL;
 766
 767     SECURITY_ATTRIBUTES security;
 768     /* create pipename */
 769     current_time = time(NULL);
 770     strftime(timestr, sizeof(timestr), "%Y%m%d%H%M%S", localtime(&current_time));
 771     pipename = g_strconcat ( "\\\\.\\pipe\\", EXTCAP_PIPE_PREFIX, "_", timestr, NULL );
 772
 773     /* Security struct to enable Inheritable HANDLE */
 774     memset(&security, 0, sizeof(SECURITY_ATTRIBUTES));
 775     security.nLength = sizeof(SECURITY_ATTRIBUTES);
 776     security.bInheritHandle = TRUE;
 777     security.lpSecurityDescriptor = NULL;
 778
 779     /* create a namedPipe*/
 780     pipe_h = CreateNamedPipe(
 781                 utf_8to16(pipename),
 782                 PIPE_ACCESS_DUPLEX | FILE_FLAG_OVERLAPPED,
 783                 PIPE_TYPE_MESSAGE| PIPE_READMODE_MESSAGE | PIPE_WAIT,
 784                 5, 65536, 65536,
 785                 300,
 786                 &security);
 787
 788     if (pipe_h == INVALID_HANDLE_VALUE)
 789     {
 790         g_log(LOG_DOMAIN_CAPTURE, G_LOG_LEVEL_DEBUG,"\nError creating pipe => (%d)", GetLastError());
 791         return FALSE;
 792     }
 793     else
 794     {
 795         g_log(LOG_DOMAIN_CAPTURE, G_LOG_LEVEL_DEBUG,"\nWireshark Created pipe =>(%s)",pipename);
 796         *fifo = g_strdup(pipename);
 797     }
 798 #else
 799     gchar *temp_name = NULL;
 800     int fd = 0;
 801
 802     if ((fd = create_tempfile(&temp_name, EXTCAP_PIPE_PREFIX)) < 0 )
 803         return FALSE;
 804
 805     ws_close(fd);
 806
 807     g_log(LOG_DOMAIN_CAPTURE, G_LOG_LEVEL_DEBUG,
 808             "Extcap - Creating fifo: %s", temp_name);
 809
 810     if ( file_exists(temp_name) )
 811         ws_unlink(temp_name);
 812
 813     if (mkfifo(temp_name, 0600) == 0)
 814         *fifo = g_strdup(temp_name);
 815 #endif
 816
 817     return TRUE;
 818 }
 819
 820 #if ARG_DEBUG
 821 void extcap_debug_arguments ( extcap_arg *arg_iter )
 822 {
 823     extcap_value *v = NULL;
 824     GList *walker = NULL;
 825
 826     printf("debug - parser dump\n");
 827     while (arg_iter != NULL) {
 828         printf("ARG %d call=%s display=\"%s\" type=", arg_iter->arg_num, arg_iter->call, arg_iter->display);
 829
 830         switch (arg_iter->arg_type) {
 831             case EXTCAP_ARG_INTEGER:
 832             printf("int\n");
 833             break;
 834             case EXTCAP_ARG_UNSIGNED:
 835             printf("unsigned\n");
 836             break;
 837             case EXTCAP_ARG_LONG:
 838             printf("long\n");
 839             break;
 840             case EXTCAP_ARG_DOUBLE:
 841             printf("double\n");
 842             break;
 843             case EXTCAP_ARG_BOOLEAN:
 844             printf("boolean\n");
 845             break;
 846             case EXTCAP_ARG_MENU:
 847             printf("menu\n");
 848             break;
 849             case EXTCAP_ARG_RADIO:
 850             printf("radio\n");
 851             break;
 852             case EXTCAP_ARG_SELECTOR:
 853             printf("selctor\n");
 854             break;
 855             case EXTCAP_ARG_STRING:
 856             printf ( "string\n" );
 857             break;
 858             case EXTCAP_ARG_MULTICHECK:
 859             printf ( "unknown\n" );
 860             break;
 861             case EXTCAP_ARG_UNKNOWN:
 862             printf ( "unknown\n" );
 863             break;
 864         }
 865
 866         if (arg_iter->range_start != NULL && arg_iter->range_end != NULL) {
 867             printf("\tRange: ");
 868             extcap_printf_complex(arg_iter->range_start);
 869             printf(" - ");
 870             extcap_printf_complex(arg_iter->range_end);
 871             printf("\n");
 872         }
 873
 874         for ( walker = g_list_first ( arg_iter->value_list ); walker; walker = walker->next )
 875         {
 876             v = (extcap_value *)walker->data;
 877             if (v->is_default)
 878             printf("*");
 879             printf("\tcall=\"%p\" display=\"%p\"\n", v->call, v->display);
 880             printf("\tcall=\"%s\" display=\"%s\"\n", v->call, v->display);
 881         }
 882
 883         arg_iter = arg_iter->next_arg;
 884     }
 885 }
 886 #endif
 887 #endif
 888
 889 /*
 890  * Editor modelines  -  http://www.wireshark.org/tools/modelines.html
 891  *
 892  * Local variables:
 893  * c-basic-offset: 4
 894  * tab-width: 8
 895  * indent-tabs-mode: nil
 896  * End:
 897  *
 898  * vi: set shiftwidth=4 tabstop=8 expandtab:
 899  * :indentSize=4:tabSize=8:noTabs=true:
 900  */