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         argv[0] = g_strdup(EXTCAP_ARGUMENT_CONFIG);
 421         argv[1] = g_strdup(EXTCAP_ARGUMENT_INTERFACE);
 422         argv[2] = g_strdup(ifname);
 423         argv[3] = NULL;
 424
 425         extcap_foreach(4, argv, search_cb, &ret, err_str, ifname);
 426     }
 427
 428     return ret;
 429 }
 430
 431 gboolean
 432 extcap_has_configuration(const char * ifname) {
 433     GList * arguments = 0;
 434     GList * walker = 0, * item = 0;
 435
 436     gboolean found = FALSE;
 437
 438     arguments = extcap_get_if_configuration((const char *)( ifname ) );
 439     walker = g_list_first(arguments);
 440
 441     while ( walker != NULL && ! found )
 442     {
 443         item = g_list_first((GList *)(walker->data));
 444         while ( item != NULL && ! found )
 445         {
 446             if ( (extcap_arg *)(item->data) != NULL )
 447                 found = TRUE;
 448
 449             item = item->next;
 450         }
 451         walker = walker->next;
 452     }
 453
 454     return found;
 455 }
 456
 457 void extcap_cleanup(capture_options * capture_opts) {
 458     interface_options interface_opts;
 459     guint icnt = 0;
 460
 461     for (icnt = 0; icnt < capture_opts->ifaces->len; icnt++) {
 462         interface_opts = g_array_index(capture_opts->ifaces, interface_options,
 463                 icnt);
 464
 465         /* skip native interfaces */
 466         if (interface_opts.if_type != IF_EXTCAP)
 467         continue;
 468
 469         g_log(LOG_DOMAIN_CAPTURE, G_LOG_LEVEL_DEBUG,
 470                 "Extcap [%s] - Cleaning up fifo: %s; PID: %d", interface_opts.name,
 471                 interface_opts.extcap_fifo, interface_opts.extcap_pid);
 472 #ifdef _WIN32
 473         if (pipe_h)
 474         {
 475             g_log(LOG_DOMAIN_CAPTURE, G_LOG_LEVEL_DEBUG,
 476                 "Extcap [%s] - Closing pipe", interface_opts.name);
 477             FlushFileBuffers(pipe_h);
 478             DisconnectNamedPipe(pipe_h);
 479             CloseHandle(pipe_h);
 480         }
 481 #else
 482         if (interface_opts.extcap_fifo != NULL && file_exists(interface_opts.extcap_fifo))
 483         {
 484             /* the fifo will not be freed here, but with the other capture_opts in capture_sync */
 485             ws_unlink(interface_opts.extcap_fifo);
 486             interface_opts.extcap_fifo = NULL;
 487         }
 488 #endif
 489         /* Maybe the client closed and removed fifo, but ws should check if
 490          * pid should be closed */
 491         g_log(LOG_DOMAIN_CAPTURE, G_LOG_LEVEL_DEBUG,
 492                 "Extcap [%s] - Closing spawned PID: %d", interface_opts.name,
 493                 interface_opts.extcap_pid);
 494
 495         if (interface_opts.extcap_child_watch > 0)
 496         {
 497             g_source_remove(interface_opts.extcap_child_watch);
 498             interface_opts.extcap_child_watch = 0;
 499         }
 500
 501         if (interface_opts.extcap_pid != INVALID_EXTCAP_PID)
 502         {
 503 #ifdef _WIN32
 504             TerminateProcess(interface_opts.extcap_pid, 0);
 505 #endif
 506             g_spawn_close_pid(interface_opts.extcap_pid);
 507             interface_opts.extcap_pid = INVALID_EXTCAP_PID;
 508         }
 509
 510         /* Make sure modified interface_opts is saved in capture_opts. */
 511         capture_opts->ifaces = g_array_remove_index(capture_opts->ifaces, icnt);
 512         g_array_insert_val(capture_opts->ifaces, icnt, interface_opts);
 513     }
 514 }
 515
 516 static void
 517 extcap_arg_cb(gpointer key, gpointer value, gpointer data) {
 518     GPtrArray *args = (GPtrArray *)data;
 519
 520     if ( key != NULL )
 521     {
 522         g_ptr_array_add(args, g_strdup((const gchar*)key));
 523
 524         if ( value != NULL )
 525             g_ptr_array_add(args, g_strdup((const gchar*)value));
 526     }
 527 }
 528
 529 static void extcap_child_watch_cb(GPid pid, gint status _U_, gpointer user_data)
 530 {
 531     guint i;
 532     interface_options interface_opts;
 533     capture_options *capture_opts = (capture_options *)user_data;
 534
 535     /* Close handle to child process. */
 536     g_spawn_close_pid(pid);
 537
 538     /* Update extcap_pid in interface options structure. */
 539     for (i = 0; i < capture_opts->ifaces->len; i++)
 540     {
 541         interface_opts = g_array_index(capture_opts->ifaces, interface_options, i);
 542         if (interface_opts.extcap_pid == pid)
 543         {
 544             interface_opts.extcap_pid = INVALID_EXTCAP_PID;
 545             interface_opts.extcap_child_watch = 0;
 546             capture_opts->ifaces = g_array_remove_index(capture_opts->ifaces, i);
 547             g_array_insert_val(capture_opts->ifaces, i, interface_opts);
 548             break;
 549         }
 550     }
 551 }
 552
 553 /* call mkfifo for each extcap,
 554  * returns FALSE if there's an error creating a FIFO */
 555 gboolean
 556 extcaps_init_initerfaces(capture_options *capture_opts)
 557 {
 558     guint i;
 559     interface_options interface_opts;
 560
 561     for (i = 0; i < capture_opts->ifaces->len; i++)
 562     {
 563         GPtrArray *args = NULL;
 564         GPid pid = INVALID_EXTCAP_PID;
 565         gchar **tmp;
 566         int tmp_i;
 567
 568         interface_opts = g_array_index(capture_opts->ifaces, interface_options, i);
 569
 570         /* skip native interfaces */
 571         if (interface_opts.if_type != IF_EXTCAP )
 572             continue;
 573
 574         /* create pipe for fifo */
 575         if ( ! extcap_create_pipe ( &interface_opts.extcap_fifo ) )
 576             return FALSE;
 577
 578         /* Create extcap call */
 579         args = g_ptr_array_new();
 580 #define add_arg(X) g_ptr_array_add(args, g_strdup(X))
 581
 582         add_arg(interface_opts.extcap);
 583         add_arg(EXTCAP_ARGUMENT_RUN_CAPTURE);
 584         add_arg(EXTCAP_ARGUMENT_INTERFACE);
 585         add_arg(interface_opts.name);
 586         add_arg(EXTCAP_ARGUMENT_RUN_PIPE);
 587         add_arg(interface_opts.extcap_fifo);
 588         if (interface_opts.extcap_args == NULL)
 589         {
 590             /* User did not perform interface configuration.
 591              *
 592              * Check if there are any boolean flags that are set by default
 593              * and hence their argument should be added.
 594              */
 595             GList *arglist;
 596             GList *elem;
 597
 598             arglist = extcap_get_if_configuration(interface_opts.name);
 599             for (elem = g_list_first(arglist); elem; elem = elem->next)
 600             {
 601                 GList * arg_list;
 602                 extcap_arg *arg_iter;
 603
 604                 if (elem->data == NULL)
 605                 {
 606                     continue;
 607                 }
 608
 609                 arg_list = g_list_first((GList *)elem->data);
 610                 while (arg_list != NULL)
 611                 {
 612                     /* In case of boolflags only first element in arg_list is relevant. */
 613                     arg_iter = (extcap_arg*) (arg_list->data);
 614
 615                     if  (arg_iter->arg_type == EXTCAP_ARG_BOOLFLAG)
 616                     {
 617                         if (arg_iter->default_complex != NULL
 618                             && extcap_complex_get_bool(arg_iter->default_complex))
 619                         {
 620                             add_arg(arg_iter->call);
 621                         }
 622                     }
 623
 624                     arg_list = arg_list->next;
 625                 }
 626             }
 627
 628             extcap_free_if_configuration(arglist);
 629         }
 630         else
 631         {
 632             g_hash_table_foreach(interface_opts.extcap_args, extcap_arg_cb, args);
 633         }
 634         add_arg(NULL);
 635 #undef add_arg
 636
 637         /* Dump commandline parameters sent to extcap. */
 638         for (tmp = (gchar **)args->pdata, tmp_i = 0; *tmp && **tmp; ++tmp_i, ++tmp)
 639         {
 640             g_log(LOG_DOMAIN_CAPTURE, G_LOG_LEVEL_DEBUG, "argv[%d]: %s", tmp_i, *tmp);
 641         }
 642
 643         /* Wireshark for windows crashes here sometimes *
 644          * Access violation reading location 0x...      */
 645         g_spawn_async(NULL, (gchar **)args->pdata, NULL,
 646                     (GSpawnFlags) G_SPAWN_DO_NOT_REAP_CHILD, NULL, NULL,
 647                     &pid,NULL);
 648
 649         g_ptr_array_foreach(args, (GFunc)g_free, NULL);
 650         g_ptr_array_free(args, TRUE);
 651         interface_opts.extcap_pid = pid;
 652         interface_opts.extcap_child_watch =
 653             g_child_watch_add(pid, extcap_child_watch_cb, (gpointer)capture_opts);
 654         capture_opts->ifaces = g_array_remove_index(capture_opts->ifaces, i);
 655         g_array_insert_val(capture_opts->ifaces, i, interface_opts);
 656
 657 #ifdef _WIN32
 658         /* On Windows, wait for extcap to connect to named pipe.
 659          * Some extcaps will present UAC screen to user.
 660          * 30 second timeout should be reasonable timeout for extcap to
 661          * connect to named pipe (including user interaction).
 662          * Wait on multiple object in case of extcap termination
 663          * without opening pipe.
 664          *
 665          * Minimum supported version of Windows: XP / Server 2003.
 666          */
 667         if (pid != INVALID_EXTCAP_PID)
 668         {
 669             DWORD dw;
 670             HANDLE handles[2];
 671             OVERLAPPED ov;
 672             ov.Pointer = 0;
 673             ov.hEvent = CreateEvent(NULL, TRUE, FALSE, NULL);
 674
 675             ConnectNamedPipe(pipe_h, &ov);
 676             handles[0] = ov.hEvent;
 677             handles[1] = pid;
 678
 679             if (GetLastError() == ERROR_PIPE_CONNECTED)
 680             {
 681                 g_log(LOG_DOMAIN_CAPTURE, G_LOG_LEVEL_DEBUG, "extcap connected to pipe");
 682             }
 683             else
 684             {
 685                 dw = WaitForMultipleObjects(2, handles, FALSE, 30000);
 686                 if (dw == WAIT_OBJECT_0)
 687                 {
 688                     /* ConnectNamedPipe finished. */
 689                     DWORD code;
 690
 691                     code = GetLastError();
 692                     if (code == ERROR_IO_PENDING)
 693                     {
 694                         DWORD dummy;
 695                         if (!GetOverlappedResult(ov.hEvent, &ov, &dummy, TRUE))
 696                         {
 697                             code = GetLastError();
 698                         }
 699                         else
 700                         {
 701                             code = ERROR_SUCCESS;
 702                         }
 703                     }
 704
 705                     g_log(LOG_DOMAIN_CAPTURE, G_LOG_LEVEL_DEBUG, "ConnectNamedPipe code: %d", code);
 706                 }
 707                 else if (dw == (WAIT_OBJECT_0 + 1))
 708                 {
 709                     /* extcap process terminated. */
 710                     g_log(LOG_DOMAIN_CAPTURE, G_LOG_LEVEL_DEBUG, "extcap terminated without connecting to pipe!");
 711                 }
 712                 else if (dw == WAIT_TIMEOUT)
 713                 {
 714                     g_log(LOG_DOMAIN_CAPTURE, G_LOG_LEVEL_DEBUG, "extcap didn't connect to pipe within 30 seconds!");
 715                 }
 716                 else
 717                 {
 718                     g_log(LOG_DOMAIN_CAPTURE, G_LOG_LEVEL_DEBUG, "WaitForMultipleObjects returned 0x%08X. Error %d", dw, GetLastError());
 719                 }
 720             }
 721
 722             CloseHandle(ov.hEvent);
 723         }
 724 #endif
 725     }
 726
 727     return TRUE;
 728 }
 729
 730 #ifdef _WIN32
 731 /* called by capture_sync to get the CreatNamedPipe handle*/
 732 HANDLE
 733 extcap_get_win32_handle()
 734 {
 735     return pipe_h;
 736 }
 737 #endif
 738
 739 gboolean extcap_create_pipe(char ** fifo)
 740 {
 741 #ifdef _WIN32
 742     gchar timestr[ 14+1 ];
 743     time_t current_time;
 744
 745     gchar *pipename = NULL;
 746
 747     SECURITY_ATTRIBUTES security;
 748     /* create pipename */
 749     current_time = time(NULL);
 750     strftime(timestr, sizeof(timestr), "%Y%m%d%H%M%S", localtime(&current_time));
 751     pipename = g_strconcat ( "\\\\.\\pipe\\", EXTCAP_PIPE_PREFIX, "_", timestr, NULL );
 752
 753     /* Security struct to enable Inheritable HANDLE */
 754     memset(&security, 0, sizeof(SECURITY_ATTRIBUTES));
 755     security.nLength = sizeof(SECURITY_ATTRIBUTES);
 756     security.bInheritHandle = TRUE;
 757     security.lpSecurityDescriptor = NULL;
 758
 759     /* create a namedPipe*/
 760     pipe_h = CreateNamedPipe(
 761                 utf_8to16(pipename),
 762                 PIPE_ACCESS_DUPLEX | FILE_FLAG_OVERLAPPED,
 763                 PIPE_TYPE_MESSAGE| PIPE_READMODE_MESSAGE | PIPE_WAIT,
 764                 5, 65536, 65536,
 765                 300,
 766                 &security);
 767
 768     if (pipe_h == INVALID_HANDLE_VALUE)
 769     {
 770         g_log(LOG_DOMAIN_CAPTURE, G_LOG_LEVEL_DEBUG,"\nError creating pipe => (%d)", GetLastError());
 771         return FALSE;
 772     }
 773     else
 774     {
 775         g_log(LOG_DOMAIN_CAPTURE, G_LOG_LEVEL_DEBUG,"\nWireshark Created pipe =>(%s)",pipename);
 776         *fifo = g_strdup(pipename);
 777     }
 778 #else
 779     gchar *temp_name = NULL;
 780     int fd = 0;
 781
 782     if ((fd = create_tempfile(&temp_name, EXTCAP_PIPE_PREFIX)) < 0 )
 783         return FALSE;
 784
 785     ws_close(fd);
 786
 787     g_log(LOG_DOMAIN_CAPTURE, G_LOG_LEVEL_DEBUG,
 788             "Extcap - Creating fifo: %s", temp_name);
 789
 790     if ( file_exists(temp_name) )
 791         ws_unlink(temp_name);
 792
 793     if (mkfifo(temp_name, 0600) == 0)
 794         *fifo = g_strdup(temp_name);
 795 #endif
 796
 797     return TRUE;
 798 }
 799
 800 #if ARG_DEBUG
 801 void extcap_debug_arguments ( extcap_arg *arg_iter )
 802 {
 803     extcap_value *v = NULL;
 804     GList *walker = NULL;
 805
 806     printf("debug - parser dump\n");
 807     while (arg_iter != NULL) {
 808         printf("ARG %d call=%s display=\"%s\" type=", arg_iter->arg_num, arg_iter->call, arg_iter->display);
 809
 810         switch (arg_iter->arg_type) {
 811             case EXTCAP_ARG_INTEGER:
 812             printf("int\n");
 813             break;
 814             case EXTCAP_ARG_UNSIGNED:
 815             printf("unsigned\n");
 816             break;
 817             case EXTCAP_ARG_LONG:
 818             printf("long\n");
 819             break;
 820             case EXTCAP_ARG_DOUBLE:
 821             printf("double\n");
 822             break;
 823             case EXTCAP_ARG_BOOLEAN:
 824             printf("boolean\n");
 825             break;
 826             case EXTCAP_ARG_MENU:
 827             printf("menu\n");
 828             break;
 829             case EXTCAP_ARG_RADIO:
 830             printf("radio\n");
 831             break;
 832             case EXTCAP_ARG_SELECTOR:
 833             printf("selctor\n");
 834             break;
 835             case EXTCAP_ARG_STRING:
 836             printf ( "string\n" );
 837             break;
 838             case EXTCAP_ARG_MULTICHECK:
 839             printf ( "unknown\n" );
 840             break;
 841             case EXTCAP_ARG_UNKNOWN:
 842             printf ( "unknown\n" );
 843             break;
 844         }
 845
 846         if (arg_iter->range_start != NULL && arg_iter->range_end != NULL) {
 847             printf("\tRange: ");
 848             extcap_printf_complex(arg_iter->range_start);
 849             printf(" - ");
 850             extcap_printf_complex(arg_iter->range_end);
 851             printf("\n");
 852         }
 853
 854         for ( walker = g_list_first ( arg_iter->value_list ); walker; walker = walker->next )
 855         {
 856             v = (extcap_value *)walker->data;
 857             if (v->is_default == TRUE)
 858             printf("*");
 859             printf("\tcall=\"%p\" display=\"%p\"\n", v->call, v->display);
 860             printf("\tcall=\"%s\" display=\"%s\"\n", v->call, v->display);
 861         }
 862
 863         arg_iter = arg_iter->next_arg;
 864     }
 865 }
 866 #endif
 867 #endif
 868
 869 /*
 870  * Editor modelines  -  http://www.wireshark.org/tools/modelines.html
 871  *
 872  * Local variables:
 873  * c-basic-offset: 4
 874  * tab-width: 8
 875  * indent-tabs-mode: nil
 876  * End:
 877  *
 878  * vi: set shiftwidth=4 tabstop=8 expandtab:
 879  * :indentSize=4:tabSize=8:noTabs=true:
 880  */