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 extcaps_init_initerfaces 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_cleanup(void)
 121 {
 122     if ( ifaces == NULL )
 123         ifaces = g_hash_table_new(g_str_hash, g_str_equal);
 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 }
 134
 135 static void extcap_foreach(gint argc, gchar **args, extcap_cb_t cb,
 136         void *cb_data, char **err_str, const char * ifname _U_) {
 137     const char *dirname = get_extcap_dir();
 138     GDir *dir;
 139     const gchar *file;
 140     gboolean keep_going;
 141     gchar **argv;
 142 #ifdef WIN32
 143     gchar **dll_search_envp;
 144     gchar *progfile_dir;
 145 #endif
 146
 147     keep_going = TRUE;
 148
 149     argv = (gchar **) g_malloc0(sizeof(gchar *) * (argc + 2));
 150
 151 #ifdef WIN32
 152     /*
 153      * Make sure executables can find dependent DLLs and that they're *our*
 154      * DLLs: https://msdn.microsoft.com/en-us/library/windows/desktop/ms682586.aspx
 155      * Alternatively we could create a simple wrapper exe similar to Create
 156      * Hidden Process (http://www.commandline.co.uk/chp/).
 157      */
 158     dll_search_envp = g_get_environ();
 159     progfile_dir = g_strdup_printf("%s;%s", get_progfile_dir(), g_environ_getenv(dll_search_envp, "Path"));
 160     dll_search_envp = g_environ_setenv(dll_search_envp, "Path", progfile_dir, TRUE);
 161     g_free(progfile_dir);
 162 #endif
 163
 164     if ((dir = g_dir_open(dirname, 0, NULL)) != NULL) {
 165 #ifdef WIN32
 166         dirname = g_strescape(dirname,NULL);
 167 #endif
 168         while (keep_going && (file = g_dir_read_name(dir)) != NULL ) {
 169             GString *extcap_string = NULL;
 170             gchar *extcap = NULL;
 171             gchar *command_output = NULL;
 172             gboolean status = FALSE;
 173             gint i;
 174             gint exit_status = 0;
 175             GError *error = NULL;
 176             gchar **envp = NULL;
 177
 178             /* full path to extcap binary */
 179             extcap_string = g_string_new("");
 180 #ifdef WIN32
 181             g_string_printf(extcap_string, "%s\\\\%s",dirname,file);
 182             extcap = g_string_free(extcap_string, FALSE);
 183             envp = dll_search_envp;
 184 #else
 185             g_string_printf(extcap_string, "%s/%s", dirname, file);
 186             extcap = g_string_free(extcap_string, FALSE);
 187 #endif
 188             if ( extcap_if_exists(ifname) && !extcap_if_exists_for_extcap(ifname, extcap ) )
 189                 continue;
 190
 191             argv[0] = extcap;
 192             for (i = 0; i < argc; ++i)
 193                 argv[i+1] = args[i];
 194             argv[argc+1] = NULL;
 195
 196             status = g_spawn_sync(dirname, argv, envp,
 197                 (GSpawnFlags) 0, NULL, NULL,
 198                     &command_output, NULL, &exit_status, &error);
 199
 200             if (status && exit_status == 0)
 201             keep_going = cb(extcap, command_output, cb_data, err_str);
 202
 203             g_free(extcap);
 204             g_free(command_output);
 205         }
 206
 207         g_dir_close(dir);
 208     }
 209
 210 #ifdef WIN32
 211     g_strfreev(dll_search_envp);
 212 #endif
 213     g_free(argv);
 214 }
 215
 216 static gboolean dlt_cb(const gchar *extcap _U_, gchar *output, void *data,
 217         char **err_str) {
 218     extcap_token_sentence *tokens;
 219     extcap_dlt *dlts, *dlt_iter, *next;
 220     if_capabilities_t *caps;
 221     GList *linktype_list = NULL;
 222     data_link_info_t *data_link_info;
 223
 224     tokens = extcap_tokenize_sentences(output);
 225     extcap_parse_dlts(tokens, &dlts);
 226
 227     extcap_free_tokenized_sentence_list(tokens);
 228
 229     g_log(LOG_DOMAIN_CAPTURE, G_LOG_LEVEL_DEBUG, "Extcap pipe %s ", extcap);
 230
 231     /*
 232      * Allocate the interface capabilities structure.
 233      */
 234     caps = (if_capabilities_t *) g_malloc(sizeof *caps);
 235     caps->can_set_rfmon = FALSE;
 236
 237     dlt_iter = dlts;
 238     while (dlt_iter != NULL ) {
 239         g_log(LOG_DOMAIN_CAPTURE, G_LOG_LEVEL_DEBUG,
 240                 "  DLT %d name=\"%s\" display=\"%s\" ", dlt_iter->number,
 241                 dlt_iter->name, dlt_iter->display);
 242
 243         data_link_info = g_new(data_link_info_t, 1);
 244         data_link_info->dlt = dlt_iter->number;
 245         data_link_info->name = g_strdup(dlt_iter->name);
 246         data_link_info->description = g_strdup(dlt_iter->display);
 247         linktype_list = g_list_append(linktype_list, data_link_info);
 248         dlt_iter = dlt_iter->next_dlt;
 249     }
 250
 251     /* Check to see if we built a list */
 252     if (linktype_list != NULL && data != NULL) {
 253         caps->data_link_types = linktype_list;
 254         *(if_capabilities_t **) data = caps;
 255     } else {
 256         if (err_str) {
 257             g_log(LOG_DOMAIN_CAPTURE, G_LOG_LEVEL_DEBUG, "  returned no DLTs");
 258             *err_str = g_strdup("Extcap returned no DLTs");
 259         }
 260         g_free(caps);
 261     }
 262
 263     dlt_iter = dlts;
 264     while (dlt_iter != NULL ) {
 265         next = dlt_iter->next_dlt;
 266         extcap_free_dlt(dlt_iter);
 267         dlt_iter = next;
 268     }
 269
 270     return FALSE;
 271 }
 272
 273 if_capabilities_t *
 274 extcap_get_if_dlts(const gchar *ifname, char **err_str) {
 275     gchar *argv[3];
 276     gint i;
 277     if_capabilities_t *caps = NULL;
 278
 279     if (ifname != NULL && err_str != NULL)
 280         *err_str = NULL;
 281
 282     if ( extcap_if_exists(ifname) )
 283     {
 284         argv[0] = g_strdup(EXTCAP_ARGUMENT_LIST_DLTS);
 285         argv[1] = g_strdup(EXTCAP_ARGUMENT_INTERFACE);
 286         argv[2] = g_strdup(ifname);
 287
 288         if (err_str)
 289             *err_str = NULL;
 290         extcap_foreach(3, argv, dlt_cb, &caps, err_str, ifname);
 291
 292         for (i = 0; i < 3; ++i)
 293             g_free(argv[i]);
 294     }
 295
 296     return caps;
 297 }
 298
 299 static gboolean interfaces_cb(const gchar *extcap, gchar *output, void *data,
 300         char **err_str _U_) {
 301     GList **il = (GList **) data;
 302     extcap_token_sentence *tokens;
 303     extcap_interface *interfaces, *int_iter; /*, *next; */
 304     if_info_t *if_info;
 305
 306     tokens = extcap_tokenize_sentences(output);
 307     extcap_parse_interfaces(tokens, &interfaces);
 308
 309     extcap_free_tokenized_sentence_list(tokens);
 310
 311     g_log(LOG_DOMAIN_CAPTURE, G_LOG_LEVEL_DEBUG, "Extcap pipe %s ", extcap);
 312
 313     int_iter = interfaces;
 314     while (int_iter != NULL ) {
 315         if ( extcap_if_exists(int_iter->call) )
 316         {
 317             g_log(LOG_DOMAIN_CAPTURE, G_LOG_LEVEL_WARNING, "Extcap interface \"%s\" is already provided by \"%s\" ",
 318                     int_iter->call, (gchar *)extcap_if_executable(int_iter->call) );
 319             int_iter = int_iter->next_interface;
 320             continue;
 321         }
 322
 323         g_log(LOG_DOMAIN_CAPTURE, G_LOG_LEVEL_DEBUG, "  Interface [%s] \"%s\" ",
 324                 int_iter->call, int_iter->display);
 325
 326         if_info = g_new0(if_info_t, 1);
 327         if_info->name = g_strdup(int_iter->call);
 328         if_info->friendly_name = g_strdup(int_iter->display);
 329
 330         if_info->type = IF_EXTCAP;
 331
 332         if_info->extcap = g_strdup(extcap);
 333         *il = g_list_append(*il, if_info);
 334
 335         extcap_if_add(g_strdup(int_iter->call), g_strdup(extcap) );
 336         int_iter = int_iter->next_interface;
 337     }
 338
 339     return TRUE;
 340 }
 341
 342 GList *
 343 extcap_interface_list(char **err_str) {
 344     gchar *argv;
 345     /* gint i; */
 346     GList *ret = NULL;
 347
 348     if (err_str != NULL)
 349     *err_str = NULL;
 350
 351     extcap_if_cleanup();
 352
 353     argv = g_strdup(EXTCAP_ARGUMENT_LIST_INTERFACES);
 354
 355     if (err_str)
 356     *err_str = NULL;
 357     extcap_foreach(1, &argv, interfaces_cb, &ret, err_str, NULL);
 358
 359     g_free(argv);
 360
 361     return ret;
 362 }
 363
 364 static void g_free_1(gpointer data, gpointer user_data _U_)
 365 {
 366     g_free(data);
 367 }
 368
 369 static void extcap_free_if_configuration(GList *list)
 370 {
 371     GList *elem;
 372
 373     for (elem = g_list_first(list); elem; elem = elem->next)
 374     {
 375         GList *arg_list;
 376         if (elem->data == NULL)
 377         {
 378             continue;
 379         }
 380
 381         arg_list = g_list_first((GList *)elem->data);
 382         g_list_foreach(arg_list, g_free_1, NULL);
 383         g_list_free(arg_list);
 384     }
 385     g_list_free(list);
 386 }
 387
 388 static gboolean search_cb(const gchar *extcap _U_, gchar *output, void *data,
 389         char **err_str _U_) {
 390     extcap_token_sentence *tokens = NULL;
 391     GList *arguments = NULL;
 392     GList **il = (GList **) data;
 393
 394     tokens = extcap_tokenize_sentences(output);
 395     arguments = extcap_parse_args(tokens);
 396
 397     extcap_free_tokenized_sentence_list(tokens);
 398
 399 #if ARG_DEBUG
 400     extcap_debug_arguments ( arguments );
 401 #endif
 402
 403     *il = g_list_append(*il, arguments);
 404
 405     /* By returning false, extcap_foreach will break on first found */
 406     return TRUE;
 407 }
 408
 409 GList *
 410 extcap_get_if_configuration(const char * ifname) {
 411     gchar *argv[4];
 412     GList *ret = NULL;
 413     gchar **err_str = NULL;
 414
 415     if ( extcap_if_exists(ifname) )
 416     {
 417         g_log(LOG_DOMAIN_CAPTURE, G_LOG_LEVEL_DEBUG, "Extcap path %s",
 418                 get_extcap_dir());
 419
 420         if (err_str != NULL)
 421         *err_str = NULL;
 422
 423         argv[0] = g_strdup(EXTCAP_ARGUMENT_CONFIG);
 424         argv[1] = g_strdup(EXTCAP_ARGUMENT_INTERFACE);
 425         argv[2] = g_strdup(ifname);
 426         argv[3] = NULL;
 427
 428         extcap_foreach(4, argv, search_cb, &ret, err_str, ifname);
 429     }
 430
 431     return ret;
 432 }
 433
 434 void extcap_cleanup(capture_options * capture_opts) {
 435     interface_options interface_opts;
 436     guint icnt = 0;
 437
 438     for (icnt = 0; icnt < capture_opts->ifaces->len; icnt++) {
 439         interface_opts = g_array_index(capture_opts->ifaces, interface_options,
 440                 icnt);
 441
 442         /* skip native interfaces */
 443         if (interface_opts.if_type != IF_EXTCAP)
 444         continue;
 445
 446         g_log(LOG_DOMAIN_CAPTURE, G_LOG_LEVEL_DEBUG,
 447                 "Extcap [%s] - Cleaning up fifo: %s; PID: %d", interface_opts.name,
 448                 interface_opts.extcap_fifo, interface_opts.extcap_pid);
 449 #ifdef WIN32
 450         if (pipe_h)
 451         {
 452             g_log(LOG_DOMAIN_CAPTURE, G_LOG_LEVEL_DEBUG,
 453                 "Extcap [%s] - Closing pipe", interface_opts.name);
 454             FlushFileBuffers(pipe_h);
 455             DisconnectNamedPipe(pipe_h);
 456             CloseHandle(pipe_h);
 457         }
 458 #else
 459         if (interface_opts.extcap_fifo != NULL && file_exists(interface_opts.extcap_fifo))
 460         {
 461             /* the fifo will not be freed here, but with the other capture_opts in capture_sync */
 462             ws_unlink(interface_opts.extcap_fifo);
 463             interface_opts.extcap_fifo = NULL;
 464         }
 465 #endif
 466         /* Maybe the client closed and removed fifo, but ws should check if
 467          * pid should be closed */
 468         g_log(LOG_DOMAIN_CAPTURE, G_LOG_LEVEL_DEBUG,
 469                 "Extcap [%s] - Closing spawned PID: %d", interface_opts.name,
 470                 interface_opts.extcap_pid);
 471
 472         if (interface_opts.extcap_child_watch > 0)
 473         {
 474             g_source_remove(interface_opts.extcap_child_watch);
 475             interface_opts.extcap_child_watch = 0;
 476         }
 477
 478         if (interface_opts.extcap_pid != INVALID_EXTCAP_PID)
 479         {
 480 #ifdef WIN32
 481             TerminateProcess(interface_opts.extcap_pid, 0);
 482 #endif
 483             g_spawn_close_pid(interface_opts.extcap_pid);
 484             interface_opts.extcap_pid = INVALID_EXTCAP_PID;
 485         }
 486
 487         /* Make sure modified interface_opts is saved in capture_opts. */
 488         capture_opts->ifaces = g_array_remove_index(capture_opts->ifaces, icnt);
 489         g_array_insert_val(capture_opts->ifaces, icnt, interface_opts);
 490     }
 491 }
 492
 493 static void
 494 extcap_arg_cb(gpointer key, gpointer value, gpointer data) {
 495     GPtrArray *args = (GPtrArray *)data;
 496
 497     if ( key != NULL )
 498     {
 499         g_ptr_array_add(args, g_strdup((const gchar*)key));
 500
 501         if ( value != NULL )
 502             g_ptr_array_add(args, g_strdup((const gchar*)value));
 503     }
 504 }
 505
 506 static void extcap_child_watch_cb(GPid pid, gint status _U_, gpointer user_data)
 507 {
 508     guint i;
 509     interface_options interface_opts;
 510     capture_options *capture_opts = (capture_options *)user_data;
 511
 512     /* Close handle to child process. */
 513     g_spawn_close_pid(pid);
 514
 515     /* Update extcap_pid in interface options structure. */
 516     for (i = 0; i < capture_opts->ifaces->len; i++)
 517     {
 518         interface_opts = g_array_index(capture_opts->ifaces, interface_options, i);
 519         if (interface_opts.extcap_pid == pid)
 520         {
 521             interface_opts.extcap_pid = INVALID_EXTCAP_PID;
 522             interface_opts.extcap_child_watch = 0;
 523             capture_opts->ifaces = g_array_remove_index(capture_opts->ifaces, i);
 524             g_array_insert_val(capture_opts->ifaces, i, interface_opts);
 525             break;
 526         }
 527     }
 528 }
 529
 530 /* call mkfifo for each extcap,
 531  * returns FALSE if there's an error creating a FIFO */
 532 gboolean
 533 extcaps_init_initerfaces(capture_options *capture_opts)
 534 {
 535     guint i;
 536     interface_options interface_opts;
 537
 538     for (i = 0; i < capture_opts->ifaces->len; i++)
 539     {
 540         GPtrArray *args = NULL;
 541         GPid pid = INVALID_EXTCAP_PID;
 542         gchar **tmp;
 543         int tmp_i;
 544
 545         interface_opts = g_array_index(capture_opts->ifaces, interface_options, i);
 546
 547         /* skip native interfaces */
 548         if (interface_opts.if_type != IF_EXTCAP )
 549             continue;
 550
 551         /* create pipe for fifo */
 552         if ( ! extcap_create_pipe ( &interface_opts.extcap_fifo ) )
 553             return FALSE;
 554
 555         /* Create extcap call */
 556         args = g_ptr_array_new();
 557 #define add_arg(X) g_ptr_array_add(args, g_strdup(X))
 558
 559         add_arg(interface_opts.extcap);
 560         add_arg(EXTCAP_ARGUMENT_RUN_CAPTURE);
 561         add_arg(EXTCAP_ARGUMENT_INTERFACE);
 562         add_arg(interface_opts.name);
 563         add_arg(EXTCAP_ARGUMENT_RUN_PIPE);
 564         add_arg(interface_opts.extcap_fifo);
 565         if (interface_opts.extcap_args == NULL)
 566         {
 567             /* User did not perform interface configuration.
 568              *
 569              * Check if there are any boolean flags that are set by default
 570              * and hence their argument should be added.
 571              */
 572             GList *arglist;
 573             GList *elem;
 574
 575             arglist = extcap_get_if_configuration(interface_opts.name);
 576             for (elem = g_list_first(arglist); elem; elem = elem->next)
 577             {
 578                 GList * arg_list;
 579                 extcap_arg *arg_iter;
 580
 581                 if (elem->data == NULL)
 582                 {
 583                     continue;
 584                 }
 585
 586                 arg_list = g_list_first((GList *)elem->data);
 587                 while (arg_list != NULL)
 588                 {
 589                     /* In case of boolflags only first element in arg_list is relevant. */
 590                     arg_iter = (extcap_arg*) (arg_list->data);
 591
 592                     if  (arg_iter->arg_type == EXTCAP_ARG_BOOLFLAG)
 593                     {
 594                         if (arg_iter->default_complex != NULL
 595                             && extcap_complex_get_bool(arg_iter->default_complex))
 596                         {
 597                             add_arg(arg_iter->call);
 598                         }
 599                     }
 600
 601                     arg_list = arg_list->next;
 602                 }
 603             }
 604
 605             extcap_free_if_configuration(arglist);
 606         }
 607         else
 608         {
 609             g_hash_table_foreach(interface_opts.extcap_args, extcap_arg_cb, args);
 610         }
 611         add_arg(NULL);
 612 #undef add_arg
 613
 614         /* Dump commandline parameters sent to extcap. */
 615         for (tmp = (gchar **)args->pdata, tmp_i = 0; *tmp && **tmp; ++tmp_i, ++tmp)
 616         {
 617             g_log(LOG_DOMAIN_CAPTURE, G_LOG_LEVEL_DEBUG, "argv[%d]: %s", tmp_i, *tmp);
 618         }
 619
 620         /* Wireshark for windows crashes here sometimes *
 621          * Access violation reading location 0x...      */
 622         g_spawn_async(NULL, (gchar **)args->pdata, NULL,
 623                     (GSpawnFlags) G_SPAWN_DO_NOT_REAP_CHILD, NULL, NULL,
 624                     &pid,NULL);
 625
 626         g_ptr_array_foreach(args, (GFunc)g_free, NULL);
 627         g_ptr_array_free(args, TRUE);
 628         interface_opts.extcap_pid = pid;
 629         interface_opts.extcap_child_watch =
 630             g_child_watch_add(pid, extcap_child_watch_cb, (gpointer)capture_opts);
 631         capture_opts->ifaces = g_array_remove_index(capture_opts->ifaces, i);
 632         g_array_insert_val(capture_opts->ifaces, i, interface_opts);
 633
 634 #ifdef WIN32
 635         /* On Windows, wait for extcap to connect to named pipe.
 636          * Some extcaps will present UAC screen to user.
 637          * 30 second timeout should be reasonable timeout for extcap to
 638          * connect to named pipe (including user interaction).
 639          * Wait on multiple object in case of extcap termination
 640          * without opening pipe.
 641          *
 642          * Minimum supported version of Windows: XP / Server 2003.
 643          */
 644         if (pid != INVALID_EXTCAP_PID)
 645         {
 646             DWORD dw;
 647             HANDLE handles[2];
 648             OVERLAPPED ov;
 649             ov.Pointer = 0;
 650             ov.hEvent = CreateEvent(NULL, TRUE, FALSE, NULL);
 651
 652             ConnectNamedPipe(pipe_h, &ov);
 653             handles[0] = ov.hEvent;
 654             handles[1] = pid;
 655
 656             if (GetLastError() == ERROR_PIPE_CONNECTED)
 657             {
 658                 g_log(LOG_DOMAIN_CAPTURE, G_LOG_LEVEL_DEBUG, "extcap connected to pipe");
 659             }
 660             else
 661             {
 662                 dw = WaitForMultipleObjects(2, handles, FALSE, 30000);
 663                 if (dw == WAIT_OBJECT_0)
 664                 {
 665                     /* ConnectNamedPipe finished. */
 666                     DWORD code;
 667
 668                     code = GetLastError();
 669                     if (code == ERROR_IO_PENDING)
 670                     {
 671                         DWORD dummy;
 672                         if (!GetOverlappedResult(ov.hEvent, &ov, &dummy, TRUE))
 673                         {
 674                             code = GetLastError();
 675                         }
 676                         else
 677                         {
 678                             code = ERROR_SUCCESS;
 679                         }
 680                     }
 681
 682                     g_log(LOG_DOMAIN_CAPTURE, G_LOG_LEVEL_DEBUG, "ConnectNamedPipe code: %d", code);
 683                 }
 684                 else if (dw == (WAIT_OBJECT_0 + 1))
 685                 {
 686                     /* extcap process terminated. */
 687                     g_log(LOG_DOMAIN_CAPTURE, G_LOG_LEVEL_DEBUG, "extcap terminated without connecting to pipe!");
 688                 }
 689                 else if (dw == WAIT_TIMEOUT)
 690                 {
 691                     g_log(LOG_DOMAIN_CAPTURE, G_LOG_LEVEL_DEBUG, "extcap didn't connect to pipe within 30 seconds!");
 692                 }
 693                 else
 694                 {
 695                     g_log(LOG_DOMAIN_CAPTURE, G_LOG_LEVEL_DEBUG, "WaitForMultipleObjects returned 0x%08X. Error %d", dw, GetLastError());
 696                 }
 697             }
 698
 699             CloseHandle(ov.hEvent);
 700         }
 701 #endif
 702     }
 703
 704     return TRUE;
 705 }
 706
 707 #ifdef WIN32
 708 /* called by capture_sync to get the CreatNamedPipe handle*/
 709 HANDLE
 710 extcap_get_win32_handle()
 711 {
 712     return pipe_h;
 713 }
 714 #endif
 715
 716 gboolean extcap_create_pipe(char ** fifo)
 717 {
 718 #ifdef WIN32
 719     gchar timestr[ 14+1 ];
 720     time_t current_time;
 721
 722     gchar *pipename = NULL;
 723
 724     SECURITY_ATTRIBUTES security;
 725     /* create pipename */
 726     current_time = time(NULL);
 727     strftime(timestr, sizeof(timestr), "%Y%m%d%H%M%S", localtime(&current_time));
 728     pipename = g_strconcat ( "\\\\.\\pipe\\", EXTCAP_PIPE_PREFIX, "_", timestr, NULL );
 729
 730     /* Security struct to enable Inheritable HANDLE */
 731     memset(&security, 0, sizeof(SECURITY_ATTRIBUTES));
 732     security.nLength = sizeof(SECURITY_ATTRIBUTES);
 733     security.bInheritHandle = TRUE;
 734     security.lpSecurityDescriptor = NULL;
 735
 736     /* create a namedPipe*/
 737     pipe_h = CreateNamedPipe(
 738                 utf_8to16(pipename),
 739                 PIPE_ACCESS_DUPLEX | FILE_FLAG_OVERLAPPED,
 740                 PIPE_TYPE_MESSAGE| PIPE_READMODE_MESSAGE | PIPE_WAIT,
 741                 5, 65536, 65536,
 742                 300,
 743                 &security);
 744
 745     if (pipe_h == INVALID_HANDLE_VALUE)
 746     {
 747         g_log(LOG_DOMAIN_CAPTURE, G_LOG_LEVEL_DEBUG,"\nError creating pipe => (%d)", GetLastError());
 748         return FALSE;
 749     }
 750     else
 751     {
 752         g_log(LOG_DOMAIN_CAPTURE, G_LOG_LEVEL_DEBUG,"\nWireshark Created pipe =>(%s)",pipename);
 753         *fifo = g_strdup(pipename);
 754     }
 755 #else
 756     gchar *temp_name = NULL;
 757     int fd = 0;
 758
 759     if ( ( fd = create_tempfile ( &temp_name, EXTCAP_PIPE_PREFIX ) ) == 0 )
 760         return FALSE;
 761
 762     ws_close(fd);
 763
 764     g_log(LOG_DOMAIN_CAPTURE, G_LOG_LEVEL_DEBUG,
 765             "Extcap - Creating fifo: %s", temp_name);
 766
 767     if ( file_exists(temp_name) )
 768         ws_unlink(temp_name);
 769
 770     if (mkfifo(temp_name, 0600) == 0)
 771         *fifo = g_strdup(temp_name);
 772 #endif
 773
 774     return TRUE;
 775 }
 776
 777 #if ARG_DEBUG
 778 void extcap_debug_arguments ( extcap_arg *arg_iter )
 779 {
 780     extcap_value *v = NULL;
 781     GList *walker = NULL;
 782
 783     printf("debug - parser dump\n");
 784     while (arg_iter != NULL) {
 785         printf("ARG %d call=%s display=\"%s\" type=", arg_iter->arg_num, arg_iter->call, arg_iter->display);
 786
 787         switch (arg_iter->arg_type) {
 788             case EXTCAP_ARG_INTEGER:
 789             printf("int\n");
 790             break;
 791             case EXTCAP_ARG_UNSIGNED:
 792             printf("unsigned\n");
 793             break;
 794             case EXTCAP_ARG_LONG:
 795             printf("long\n");
 796             break;
 797             case EXTCAP_ARG_DOUBLE:
 798             printf("double\n");
 799             break;
 800             case EXTCAP_ARG_BOOLEAN:
 801             printf("boolean\n");
 802             break;
 803             case EXTCAP_ARG_MENU:
 804             printf("menu\n");
 805             break;
 806             case EXTCAP_ARG_RADIO:
 807             printf("radio\n");
 808             break;
 809             case EXTCAP_ARG_SELECTOR:
 810             printf("selctor\n");
 811             break;
 812             case EXTCAP_ARG_STRING:
 813             printf ( "string\n" );
 814             break;
 815             case EXTCAP_ARG_MULTICHECK:
 816             printf ( "unknown\n" );
 817             break;
 818             case EXTCAP_ARG_UNKNOWN:
 819             printf ( "unknown\n" );
 820             break;
 821         }
 822
 823         if (arg_iter->range_start != NULL && arg_iter->range_end != NULL) {
 824             printf("\tRange: ");
 825             extcap_printf_complex(arg_iter->range_start);
 826             printf(" - ");
 827             extcap_printf_complex(arg_iter->range_end);
 828             printf("\n");
 829         }
 830
 831         for ( walker = g_list_first ( arg_iter->value_list ); walker; walker = walker->next )
 832         {
 833             v = (extcap_value *)walker->data;
 834             if (v->is_default == TRUE)
 835             printf("*");
 836             printf("\tcall=\"%p\" display=\"%p\"\n", v->call, v->display);
 837             printf("\tcall=\"%s\" display=\"%s\"\n", v->call, v->display);
 838         }
 839
 840         arg_iter = arg_iter->next_arg;
 841     }
 842 }
 843 #endif
 844 #endif
 845
 846 /*
 847  * Editor modelines  -  http://www.wireshark.org/tools/modelines.html
 848  *
 849  * Local variables:
 850  * c-basic-offset: 4
 851  * tab-width: 8
 852  * indent-tabs-mode: nil
 853  * End:
 854  *
 855  * vi: set shiftwidth=4 tabstop=8 expandtab:
 856  * :indentSize=4:tabSize=8:noTabs=true:
 857  */