extcap.c

   1 /* extcap.c
   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  * SPDX-License-Identifier: GPL-2.0-or-later
  11  */
  12
  13 #include <config.h>
  14
  15 #include <stdio.h>
  16 #include <stdlib.h>
  17 #include <string.h>
  18
  19 #ifdef _WIN32
  20 #include <windows.h>
  21 #include <process.h>
  22 #include <time.h>
  23 #else
  24 /* Include for unlink */
  25 #include <unistd.h>
  26 #endif
  27
  28 #include <sys/types.h>
  29 #ifdef HAVE_SYS_WAIT_H
  30 #include <sys/wait.h>
  31 #endif
  32
  33 #include <glib.h>
  34 #include <log.h>
  35
  36 #include <epan/prefs.h>
  37
  38 #include "ui/iface_toolbar.h"
  39
  40 #include <wsutil/file_util.h>
  41 #include <wsutil/filesystem.h>
  42 #include <wsutil/ws_pipe.h>
  43 #include <wsutil/tempfile.h>
  44
  45 #include "capture_opts.h"
  46
  47 #include "extcap.h"
  48 #include "extcap_parser.h"
  49
  50 #include "version_info.h"
  51
  52 #ifdef _WIN32
  53 static HANDLE pipe_h = INVALID_HANDLE_VALUE;
  54 #endif
  55
  56 static void extcap_child_watch_cb(GPid pid, gint status, gpointer user_data);
  57
  58 /* internal container, for all the extcap executables that have been found.
  59  * Will be resetted if extcap_clear_interfaces() is being explicitly called
  60  * and is being used for printing information about all extcap interfaces found,
  61  * as well as storing all sub-interfaces
  62  */
  63 static GHashTable * _loaded_interfaces = NULL;
  64
  65 /* Internal container, which maps each ifname to the tool providing it, for faster
  66  * lookup. The key and string value are owned by this table.
  67  */
  68 static GHashTable * _tool_for_ifname = NULL;
  69
  70 /* internal container, for all the extcap executables that have been found
  71  * and that provides a toolbar with controls to be added to a Interface Toolbar
  72  */
  73 static GHashTable *_toolbars = NULL;
  74
  75 /* internal container, to map preference names to pointers that hold preference
  76  * values. These ensure that preferences can survive extcap if garbage
  77  * collection, and does not lead to dangling pointers in the prefs subsystem.
  78  */
  79 static GHashTable *extcap_prefs_dynamic_vals = NULL;
  80
  81 typedef struct _extcap_callback_info_t
  82 {
  83     const gchar * extcap;
  84     const gchar * ifname;
  85     gchar * output;
  86     void * data;
  87     gchar ** err_str;
  88 } extcap_callback_info_t;
  89
  90 /* Callback definition for extcap_foreach */
  91 typedef gboolean(*extcap_cb_t)(extcap_callback_info_t info_structure);
  92
  93 static void extcap_load_interface_list(void);
  94
  95 GHashTable *
  96 extcap_loaded_interfaces(void)
  97 {
  98     if (prefs.capture_no_extcap)
  99         return NULL;
 100
 101     if ( !_loaded_interfaces || g_hash_table_size(_loaded_interfaces) == 0 )
 102         extcap_load_interface_list();
 103
 104     return _loaded_interfaces;
 105 }
 106
 107 void
 108 extcap_clear_interfaces(void)
 109 {
 110     if ( _loaded_interfaces )
 111         g_hash_table_destroy(_loaded_interfaces);
 112     _loaded_interfaces = NULL;
 113
 114     if ( _tool_for_ifname )
 115         g_hash_table_destroy(_tool_for_ifname);
 116     _tool_for_ifname = NULL;
 117 }
 118
 119 guint extcap_count(void)
 120 {
 121     const char *dirname = get_extcap_dir();
 122     GDir *dir;
 123     guint count;
 124
 125     count = 0;
 126
 127     if ((dir = g_dir_open(dirname, 0, NULL)) != NULL)
 128     {
 129         GString *extcap_path = NULL;
 130         const gchar *file;
 131
 132         extcap_path = g_string_new("");
 133         while ((file = g_dir_read_name(dir)) != NULL)
 134         {
 135             /* full path to extcap binary */
 136             g_string_printf(extcap_path, "%s" G_DIR_SEPARATOR_S "%s", dirname, file);
 137             /* treat anything executable as an extcap binary */
 138             if (g_file_test(extcap_path->str, G_FILE_TEST_IS_REGULAR) &&
 139                 g_file_test(extcap_path->str, G_FILE_TEST_IS_EXECUTABLE))
 140             {
 141                 count++;
 142             }
 143         }
 144
 145         g_dir_close(dir);
 146         g_string_free(extcap_path, TRUE);
 147     }
 148     return count;
 149 }
 150
 151 static gboolean
 152 extcap_if_exists(const gchar *ifname)
 153 {
 154     if (!ifname || !_tool_for_ifname)
 155     {
 156         return FALSE;
 157     }
 158
 159     if (g_hash_table_lookup(_tool_for_ifname, ifname))
 160     {
 161         return TRUE;
 162     }
 163
 164     return FALSE;
 165 }
 166
 167 static extcap_interface *
 168 extcap_find_interface_for_ifname(const gchar *ifname)
 169 {
 170     extcap_interface * result = NULL;
 171
 172     if ( !ifname || ! _tool_for_ifname || ! _loaded_interfaces )
 173         return result;
 174
 175     gchar * extcap_util = (gchar *)g_hash_table_lookup(_tool_for_ifname, ifname);
 176     if ( ! extcap_util )
 177         return result;
 178
 179     extcap_info * element = (extcap_info *)g_hash_table_lookup(_loaded_interfaces, extcap_util);
 180     if ( ! element )
 181         return result;
 182
 183     GList * walker = element->interfaces;
 184     while ( walker && walker->data && ! result )
 185     {
 186         extcap_interface * interface = (extcap_interface *)walker->data;
 187         if ( g_strcmp0(interface->call, ifname) == 0 )
 188         {
 189             result = interface;
 190             break;
 191         }
 192
 193         walker = g_list_next ( walker );
 194     }
 195
 196     return result;
 197 }
 198
 199 static void
 200 extcap_free_toolbar_value(iface_toolbar_value *value)
 201 {
 202     if (!value)
 203     {
 204         return;
 205     }
 206
 207     g_free(value->value);
 208     g_free(value->display);
 209     g_free(value);
 210 }
 211
 212 static void
 213 extcap_free_toolbar_control(iface_toolbar_control *control)
 214 {
 215     if (!control)
 216     {
 217         return;
 218     }
 219
 220     g_free(control->display);
 221     g_free(control->validation);
 222     g_free(control->tooltip);
 223     if (control->ctrl_type == INTERFACE_TYPE_STRING) {
 224         g_free(control->default_value.string);
 225     }
 226     g_list_free_full(control->values, (GDestroyNotify)extcap_free_toolbar_value);
 227     g_free(control);
 228 }
 229
 230 static void
 231 extcap_free_toolbar(gpointer data)
 232 {
 233     if (!data)
 234     {
 235         return;
 236     }
 237
 238     iface_toolbar *toolbar = (iface_toolbar *)data;
 239
 240     g_free(toolbar->menu_title);
 241     g_free(toolbar->help);
 242     g_list_free_full(toolbar->ifnames, g_free);
 243     g_list_free_full(toolbar->controls, (GDestroyNotify)extcap_free_toolbar_control);
 244     g_free(toolbar);
 245 }
 246
 247 static gboolean
 248 extcap_if_exists_for_extcap(const gchar *ifname, const gchar *extcap)
 249 {
 250     extcap_interface *entry = extcap_find_interface_for_ifname(ifname);
 251
 252     if (entry && strcmp(entry->extcap_path, extcap) == 0)
 253     {
 254         return TRUE;
 255     }
 256
 257     return FALSE;
 258 }
 259
 260 static gchar *
 261 extcap_if_executable(const gchar *ifname)
 262 {
 263     extcap_interface *interface = extcap_find_interface_for_ifname(ifname);
 264     return interface != NULL ? interface->extcap_path : NULL;
 265 }
 266
 267 static void
 268 extcap_iface_toolbar_add(const gchar *extcap, iface_toolbar *toolbar_entry)
 269 {
 270     char *toolname;
 271
 272     if (!extcap || !toolbar_entry)
 273     {
 274         return;
 275     }
 276
 277     toolname = g_path_get_basename(extcap);
 278
 279     if (!g_hash_table_lookup(_toolbars, toolname))
 280     {
 281         g_hash_table_insert(_toolbars, g_strdup(toolname), toolbar_entry);
 282     }
 283
 284     g_free(toolname);
 285 }
 286
 287 static gchar **
 288 extcap_convert_arguments_to_array(GList * arguments)
 289 {
 290     gchar ** result = NULL;
 291     if ( arguments )
 292     {
 293         GList * walker = g_list_first(arguments);
 294         int cnt = 0;
 295
 296         result = (gchar **) g_malloc0(sizeof(gchar *) * (g_list_length(arguments)));
 297
 298         while(walker)
 299         {
 300             result[cnt] = g_strdup((const gchar *)walker->data);
 301             walker = g_list_next(walker);
 302             cnt++;
 303         }
 304     }
 305     return result;
 306 }
 307
 308 static void extcap_free_array(gchar ** args, int argc)
 309 {
 310     int cnt = 0;
 311
 312     for ( cnt = 0; cnt < argc; cnt++ )
 313         g_free(args[cnt]);
 314     g_free(args);
 315 }
 316
 317 /* Note: args does not need to be NULL-terminated. */
 318 static gboolean extcap_foreach(GList * arguments,
 319                                       extcap_cb_t cb, extcap_callback_info_t cb_info, GList * fallback_arguments)
 320 {
 321     GDir *dir;
 322     gboolean keep_going;
 323     const char *dirname = get_extcap_dir();
 324
 325     keep_going = TRUE;
 326
 327     if (arguments && (dir = g_dir_open(dirname, 0, NULL)) != NULL)
 328     {
 329         GString *extcap_path = NULL;
 330         const gchar *file;
 331         gchar ** args = extcap_convert_arguments_to_array(arguments);
 332         int cnt = g_list_length(arguments);
 333
 334         extcap_path = g_string_new("");
 335         while (keep_going && (file = g_dir_read_name(dir)) != NULL)
 336         {
 337             gchar *command_output = NULL;
 338
 339             /* full path to extcap binary */
 340             g_string_printf(extcap_path, "%s" G_DIR_SEPARATOR_S "%s", dirname, file);
 341             /* treat anything executable as an extcap binary */
 342             if (g_file_test(extcap_path->str, G_FILE_TEST_IS_REGULAR) &&
 343                 g_file_test(extcap_path->str, G_FILE_TEST_IS_EXECUTABLE))
 344             {
 345                 if (extcap_if_exists(cb_info.ifname) && !extcap_if_exists_for_extcap(cb_info.ifname, extcap_path->str))
 346                 {
 347                     continue;
 348                 }
 349
 350                 if (ws_pipe_spawn_sync((gchar *) dirname, extcap_path->str, cnt, args, &command_output))
 351                 {
 352                     cb_info.output = command_output;
 353                     cb_info.extcap = extcap_path->str;
 354
 355                     keep_going = cb(cb_info);
 356                 }
 357                 else if ( fallback_arguments )
 358                 {
 359                     gchar ** fb_args = extcap_convert_arguments_to_array(fallback_arguments);
 360
 361                     if (ws_pipe_spawn_sync((gchar *) dirname, extcap_path->str, g_list_length(fallback_arguments), fb_args, &command_output))
 362                     {
 363                         cb_info.output = command_output;
 364                         cb_info.extcap = extcap_path->str;
 365
 366                         keep_going = cb(cb_info);
 367                     }
 368                 }
 369
 370                 g_free(command_output);
 371             }
 372
 373         }
 374         extcap_free_array(args, cnt);
 375
 376         g_dir_close(dir);
 377         g_string_free(extcap_path, TRUE);
 378     }
 379
 380     return keep_going;
 381 }
 382
 383 static void extcap_free_dlt(gpointer d, gpointer user_data _U_)
 384 {
 385     if (d == NULL)
 386     {
 387         return;
 388     }
 389
 390     g_free(((extcap_dlt *)d)->name);
 391     g_free(((extcap_dlt *)d)->display);
 392     g_free(d);
 393 }
 394
 395 static void extcap_free_dlts(GList *dlts)
 396 {
 397     g_list_foreach(dlts, extcap_free_dlt, NULL);
 398     g_list_free(dlts);
 399 }
 400
 401 static gboolean cb_dlt(extcap_callback_info_t cb_info)
 402 {
 403     GList *dlts = NULL, *temp = NULL;
 404
 405     if_capabilities_t *caps;
 406     GList *linktype_list = NULL;
 407     data_link_info_t *data_link_info;
 408     extcap_dlt *dlt_item;
 409
 410     dlts = extcap_parse_dlts(cb_info.output);
 411     temp = dlts;
 412
 413     g_log(LOG_DOMAIN_CAPTURE, G_LOG_LEVEL_DEBUG, "Extcap pipe %s ", cb_info.extcap);
 414
 415     /*
 416      * Allocate the interface capabilities structure.
 417      */
 418     caps = (if_capabilities_t *) g_malloc(sizeof * caps);
 419     caps->can_set_rfmon = FALSE;
 420     caps->timestamp_types = NULL;
 421
 422     while (dlts)
 423     {
 424         dlt_item = (extcap_dlt *)dlts->data;
 425         if (dlt_item)
 426         {
 427             g_log(LOG_DOMAIN_CAPTURE, G_LOG_LEVEL_DEBUG,
 428                   "  DLT %d name=\"%s\" display=\"%s\" ", dlt_item->number,
 429                   dlt_item->name, dlt_item->display);
 430
 431             data_link_info = g_new(data_link_info_t, 1);
 432             data_link_info->dlt = dlt_item->number;
 433             data_link_info->name = g_strdup(dlt_item->name);
 434             data_link_info->description = g_strdup(dlt_item->display);
 435             linktype_list = g_list_append(linktype_list, data_link_info);
 436         }
 437
 438         dlts = g_list_next(dlts);
 439     }
 440
 441     /* Check to see if we built a list */
 442     if (linktype_list != NULL && cb_info.data != NULL)
 443     {
 444         caps->data_link_types = linktype_list;
 445         *(if_capabilities_t **) cb_info.data = caps;
 446     }
 447     else
 448     {
 449         if (cb_info.err_str)
 450         {
 451             g_log(LOG_DOMAIN_CAPTURE, G_LOG_LEVEL_DEBUG, "  returned no DLTs");
 452             *(cb_info.err_str) = g_strdup("Extcap returned no DLTs");
 453         }
 454         g_free(caps);
 455     }
 456
 457     extcap_free_dlts(temp);
 458
 459     return FALSE;
 460 }
 461
 462 if_capabilities_t *
 463 extcap_get_if_dlts(const gchar *ifname, char **err_str)
 464 {
 465     GList * arguments = NULL;
 466     if_capabilities_t *caps = NULL;
 467
 468     if (err_str != NULL)
 469     {
 470         *err_str = NULL;
 471     }
 472
 473     if (extcap_if_exists(ifname))
 474     {
 475         arguments = g_list_append(arguments, g_strdup(EXTCAP_ARGUMENT_LIST_DLTS));
 476         arguments = g_list_append(arguments, g_strdup(EXTCAP_ARGUMENT_INTERFACE));
 477         arguments = g_list_append(arguments, g_strdup(ifname));
 478
 479         extcap_callback_info_t cb_info;
 480         cb_info.data = &caps;
 481         cb_info.err_str = err_str;
 482         cb_info.ifname = ifname;
 483
 484         extcap_foreach(arguments, cb_dlt, cb_info, NULL);
 485
 486         g_list_free_full(arguments, g_free);
 487     }
 488
 489     return caps;
 490 }
 491
 492 static void extcap_free_interface(gpointer i)
 493 {
 494
 495     extcap_interface *interface = (extcap_interface *)i;
 496
 497     if (i == NULL)
 498     {
 499         return;
 500     }
 501
 502     g_free(interface->call);
 503     g_free(interface->display);
 504     g_free(interface->version);
 505     g_free(interface->help);
 506     g_free(interface->extcap_path);
 507     g_free(interface);
 508 }
 509
 510 static void extcap_free_interfaces(GList *interfaces)
 511 {
 512     if (interfaces == NULL)
 513     {
 514         return;
 515     }
 516
 517     g_list_free_full(interfaces, extcap_free_interface);
 518 }
 519
 520 static gint
 521 if_info_compare(gconstpointer a, gconstpointer b)
 522 {
 523     gint comp = 0;
 524     const if_info_t *if_a = (const if_info_t *)a;
 525     const if_info_t *if_b = (const if_info_t *)b;
 526
 527     if ((comp = g_strcmp0(if_a->name, if_b->name)) == 0)
 528     {
 529         return g_strcmp0(if_a->friendly_name, if_b->friendly_name);
 530     }
 531
 532     return comp;
 533 }
 534
 535 gchar *
 536 extcap_get_help_for_ifname(const char *ifname)
 537 {
 538     extcap_interface *interface = extcap_find_interface_for_ifname(ifname);
 539     return interface != NULL ? interface->help : NULL;
 540 }
 541
 542 GList *
 543 append_extcap_interface_list(GList *list, char **err_str _U_)
 544 {
 545     GList *interface_list = NULL;
 546     extcap_interface *data = NULL;
 547     GList *ifutilkeys_head = NULL, *ifutilkeys = NULL;
 548
 549     if (prefs.capture_no_extcap)
 550         return list;
 551
 552     /* Update the extcap interfaces and get a list of their if_infos */
 553     if ( !_loaded_interfaces || g_hash_table_size(_loaded_interfaces) == 0 )
 554         extcap_load_interface_list();
 555
 556     ifutilkeys_head = g_hash_table_get_keys(_loaded_interfaces);
 557     ifutilkeys = ifutilkeys_head;
 558     while ( ifutilkeys && ifutilkeys->data )
 559     {
 560         extcap_info * extinfo =
 561                 (extcap_info *) g_hash_table_lookup(_loaded_interfaces, (gchar *)ifutilkeys->data);
 562         GList * walker = extinfo->interfaces;
 563         while ( walker && walker->data )
 564         {
 565             interface_list = g_list_append(interface_list, walker->data);
 566             walker = g_list_next(walker);
 567         }
 568
 569         ifutilkeys = g_list_next(ifutilkeys);
 570     }
 571     g_list_free(ifutilkeys_head);
 572
 573     /* Sort that list */
 574     interface_list = g_list_sort(interface_list, if_info_compare);
 575
 576     /* Append the interfaces in that list to the list we're handed. */
 577     while (interface_list != NULL)
 578     {
 579         GList *entry = g_list_first(interface_list);
 580         data = (extcap_interface *)entry->data;
 581         interface_list = g_list_delete_link(interface_list, entry);
 582
 583         if_info_t * if_info = g_new0(if_info_t, 1);
 584         if_info->name = g_strdup(data->call);
 585         if_info->friendly_name = g_strdup(data->display);
 586
 587         if_info->type = IF_EXTCAP;
 588
 589         if_info->extcap = g_strdup(data->extcap_path);
 590
 591         list = g_list_append(list, if_info);
 592     }
 593
 594     return list;
 595 }
 596
 597 static void
 598 extcap_register_preferences_callback(gpointer key, gpointer value _U_, gpointer user_data _U_)
 599 {
 600     GList *arguments;
 601
 602     arguments = extcap_get_if_configuration((gchar *)key);
 603     /* Memory for prefs are external to an interface, they are part of
 604      * extcap core, so the parsed arguments can be freed. */
 605     extcap_free_if_configuration(arguments, TRUE);
 606 }
 607
 608 void extcap_register_preferences(void)
 609 {
 610     if (prefs.capture_no_extcap)
 611         return;
 612
 613     module_t *dev_module = prefs_find_module("extcap");
 614
 615     if (!dev_module)
 616     {
 617         return;
 618     }
 619
 620     if ( !_loaded_interfaces || g_hash_table_size(_loaded_interfaces) == 0 )
 621         extcap_load_interface_list();
 622
 623
 624     g_hash_table_foreach(_tool_for_ifname, extcap_register_preferences_callback, NULL);
 625 }
 626
 627 /**
 628  * Releases the dynamic preference value pointers. Must not be called before
 629  * prefs_cleanup since these pointers could still be in use.
 630  */
 631 void extcap_cleanup(void)
 632 {
 633     if (extcap_prefs_dynamic_vals)
 634         g_hash_table_destroy(extcap_prefs_dynamic_vals);
 635
 636     if (_loaded_interfaces)
 637         g_hash_table_destroy(_loaded_interfaces);
 638
 639     if (_tool_for_ifname)
 640         g_hash_table_destroy(_tool_for_ifname);
 641 }
 642
 643 /**
 644  * Obtains a pointer which can store a value for the given preference name.
 645  * The preference name that can be passed to the prefs API is stored into
 646  * 'prefs_name'.
 647  *
 648  * Extcap interfaces (and their preferences) are dynamic, they can be created
 649  * and destroyed at will. Thus their data structures are insufficient to pass to
 650  * the preferences APIs which require pointers which are valid until the
 651  * preferences are removed (at exit).
 652  */
 653 static gchar **extcap_prefs_dynamic_valptr(const char *name, char **pref_name)
 654 {
 655     gchar **valp;
 656     if (!extcap_prefs_dynamic_vals)
 657     {
 658         /* Initialize table only as needed, most preferences are not dynamic */
 659         extcap_prefs_dynamic_vals = g_hash_table_new_full(g_str_hash, g_str_equal,
 660                                     g_free, g_free);
 661     }
 662     if (!g_hash_table_lookup_extended(extcap_prefs_dynamic_vals, name,
 663                                       (gpointer *)pref_name, (gpointer *)&valp))
 664     {
 665         /* New dynamic pref, allocate, initialize and store. */
 666         valp = g_new0(gchar *, 1);
 667         *pref_name = g_strdup(name);
 668         g_hash_table_insert(extcap_prefs_dynamic_vals, *pref_name, valp);
 669     }
 670     return valp;
 671 }
 672
 673 void extcap_free_if_configuration(GList *list, gboolean free_args)
 674 {
 675     GList *elem, *sl;
 676
 677     for (elem = g_list_first(list); elem; elem = elem->next)
 678     {
 679         if (elem->data != NULL)
 680         {
 681             sl = g_list_first((GList *)elem->data);
 682             if (free_args)
 683             {
 684                 extcap_free_arg_list(sl);
 685             }
 686             else
 687             {
 688                 g_list_free(sl);
 689             }
 690         }
 691     }
 692     g_list_free(list);
 693 }
 694
 695 struct preference *
 696 extcap_pref_for_argument(const gchar *ifname, struct _extcap_arg *arg)
 697 {
 698     struct preference *pref = NULL;
 699
 700     GRegex *regex_name = g_regex_new("[-]+", (GRegexCompileFlags) 0, (GRegexMatchFlags) 0, NULL);
 701     GRegex *regex_ifname = g_regex_new("(?![a-zA-Z1-9_]).", (GRegexCompileFlags) 0, (GRegexMatchFlags) 0, NULL);
 702     if (regex_name && regex_ifname)
 703     {
 704         if (prefs_find_module("extcap"))
 705         {
 706             gchar *pref_name = g_regex_replace(regex_name, arg->call, strlen(arg->call), 0, "", (GRegexMatchFlags) 0, NULL);
 707             gchar *ifname_underscore = g_regex_replace(regex_ifname, ifname, strlen(ifname), 0, "_", (GRegexMatchFlags) 0, NULL);
 708             gchar *ifname_lowercase = g_ascii_strdown(ifname_underscore, -1);
 709             gchar *pref_ifname = g_strconcat(ifname_lowercase, ".", pref_name, NULL);
 710
 711             pref = prefs_find_preference(prefs_find_module("extcap"), pref_ifname);
 712
 713             g_free(pref_name);
 714             g_free(ifname_underscore);
 715             g_free(ifname_lowercase);
 716             g_free(pref_ifname);
 717         }
 718     }
 719     if (regex_name)
 720     {
 721         g_regex_unref(regex_name);
 722     }
 723     if (regex_ifname)
 724     {
 725         g_regex_unref(regex_ifname);
 726     }
 727
 728     return pref;
 729 }
 730
 731 static gboolean cb_preference(extcap_callback_info_t cb_info)
 732 {
 733     GList *arguments = NULL;
 734     GList **il = (GList **) cb_info.data;
 735     module_t *dev_module = NULL;
 736
 737     arguments = extcap_parse_args(cb_info.output);
 738
 739     dev_module = prefs_find_module("extcap");
 740
 741     if (dev_module)
 742     {
 743         GList *walker = arguments;
 744
 745         GRegex *regex_name = g_regex_new("[-]+", (GRegexCompileFlags) 0, (GRegexMatchFlags) 0, NULL);
 746         GRegex *regex_ifname = g_regex_new("(?![a-zA-Z1-9_]).", (GRegexCompileFlags) 0, (GRegexMatchFlags) 0, NULL);
 747         if (regex_name && regex_ifname)
 748         {
 749             while (walker != NULL)
 750             {
 751                 extcap_arg *arg = (extcap_arg *)walker->data;
 752                 arg->device_name = g_strdup(cb_info.ifname);
 753
 754                 if (arg->save)
 755                 {
 756                     struct preference *pref = NULL;
 757
 758                     gchar *pref_name = g_regex_replace(regex_name, arg->call, strlen(arg->call), 0, "", (GRegexMatchFlags) 0, NULL);
 759                     gchar *ifname_underscore = g_regex_replace(regex_ifname, cb_info.ifname, strlen(cb_info.ifname), 0, "_", (GRegexMatchFlags) 0, NULL);
 760                     gchar *ifname_lowercase = g_ascii_strdown(ifname_underscore, -1);
 761                     gchar *pref_ifname = g_strconcat(ifname_lowercase, ".", pref_name, NULL);
 762
 763                     if ((pref = prefs_find_preference(dev_module, pref_ifname)) == NULL)
 764                     {
 765                         char *pref_name_for_prefs;
 766                         char *pref_title = wmem_strdup(wmem_epan_scope(), arg->display);
 767
 768                         arg->pref_valptr = extcap_prefs_dynamic_valptr(pref_ifname, &pref_name_for_prefs);
 769                         /* Set an initial value if any (the string will be copied at registration) */
 770                         if (arg->default_complex)
 771                         {
 772                             *arg->pref_valptr = arg->default_complex->_val;
 773                         }
 774
 775                         prefs_register_string_preference(dev_module, pref_name_for_prefs,
 776                                                          pref_title, pref_title, (const char **)arg->pref_valptr);
 777                     }
 778                     else
 779                     {
 780                         /* Been here before, restore stored value */
 781                         if (arg->pref_valptr == NULL)
 782                         {
 783                             arg->pref_valptr = (gchar**)g_hash_table_lookup(extcap_prefs_dynamic_vals, pref_ifname);
 784                         }
 785                     }
 786
 787                     g_free(pref_name);
 788                     g_free(ifname_underscore);
 789                     g_free(ifname_lowercase);
 790                     g_free(pref_ifname);
 791                 }
 792
 793                 walker = g_list_next(walker);
 794             }
 795         }
 796         if (regex_name)
 797         {
 798             g_regex_unref(regex_name);
 799         }
 800         if (regex_ifname)
 801         {
 802             g_regex_unref(regex_ifname);
 803         }
 804     }
 805
 806     *il = g_list_append(*il, arguments);
 807
 808     /* By returning false, extcap_foreach will break on first found */
 809     return TRUE;
 810 }
 811
 812 GList *
 813 extcap_get_if_configuration(const char *ifname)
 814 {
 815     GList * arguments = NULL;
 816     GList *ret = NULL;
 817     gchar **err_str = NULL;
 818
 819     if (extcap_if_exists(ifname))
 820     {
 821         g_log(LOG_DOMAIN_CAPTURE, G_LOG_LEVEL_DEBUG, "Extcap path %s",
 822               get_extcap_dir());
 823
 824         arguments = g_list_append(arguments, g_strdup(EXTCAP_ARGUMENT_CONFIG));
 825         arguments = g_list_append(arguments, g_strdup(EXTCAP_ARGUMENT_INTERFACE));
 826         arguments = g_list_append(arguments, g_strdup(ifname));
 827
 828         extcap_callback_info_t cb_info;
 829         cb_info.data = &ret;
 830         cb_info.err_str = err_str;
 831         cb_info.ifname = ifname;
 832
 833         extcap_foreach(arguments, cb_preference, cb_info, NULL);
 834
 835         g_list_free_full(arguments, g_free);
 836     }
 837
 838     return ret;
 839 }
 840
 841 static gboolean cb_reload_preference(extcap_callback_info_t cb_info)
 842 {
 843     GList *arguments = NULL, * walker = NULL;
 844     GList **il = (GList **) cb_info.data;
 845
 846     arguments = extcap_parse_values(cb_info.output);
 847
 848     walker = g_list_first((GList *)(arguments));
 849     while (walker != NULL)
 850     {
 851         extcap_value * val = (extcap_value *)walker->data;
 852         *il = g_list_append(*il, val);
 853         walker = g_list_next(walker);
 854     }
 855     g_list_free(arguments);
 856
 857     /* By returning false, extcap_foreach will break on first found */
 858     return FALSE;
 859 }
 860
 861 GList *
 862 extcap_get_if_configuration_values(const char * ifname, const char * argname, GHashTable *arguments)
 863 {
 864     GList * args = NULL;
 865     GList *ret = NULL;
 866     gchar **err_str = NULL;
 867
 868     if (extcap_if_exists(ifname))
 869     {
 870         g_log(LOG_DOMAIN_CAPTURE, G_LOG_LEVEL_DEBUG, "Extcap path %s",
 871               get_extcap_dir());
 872
 873         args = g_list_append(args, g_strdup(EXTCAP_ARGUMENT_CONFIG));
 874         args = g_list_append(args, g_strdup(EXTCAP_ARGUMENT_INTERFACE));
 875         args = g_list_append(args, g_strdup(ifname));
 876         args = g_list_append(args, g_strdup(EXTCAP_ARGUMENT_RELOAD_OPTION));
 877         args = g_list_append(args, g_strdup(argname));
 878
 879         if ( arguments )
 880         {
 881             GList * keys = g_hash_table_get_keys(arguments);
 882             while ( keys )
 883             {
 884                 const gchar * key_data = (const gchar *)keys->data;
 885                 args = g_list_append(args, g_strdup(key_data));
 886                 args = g_list_append(args, g_strdup((const gchar *)g_hash_table_lookup(arguments, key_data)));
 887                 keys = g_list_next(keys);
 888             }
 889         }
 890
 891         extcap_callback_info_t cb_info;
 892         cb_info.data = &ret;
 893         cb_info.err_str = err_str;
 894         cb_info.ifname = ifname;
 895
 896         extcap_foreach(args, cb_reload_preference, cb_info, NULL);
 897
 898         g_list_free_full(args, g_free);
 899     }
 900
 901     return ret;
 902 }
 903
 904 /**
 905  * If is_required is FALSE: returns TRUE if the extcap interface has
 906  * configurable options.
 907  * If is_required is TRUE: returns TRUE when the extcap interface has
 908  * configurable options that required modification. (For example, when an
 909  * argument is required but empty.)
 910  */
 911 gboolean
 912 extcap_has_configuration(const char *ifname, gboolean is_required)
 913 {
 914     GList *arguments = 0;
 915     GList *walker = 0, * item = 0;
 916
 917     gboolean found = FALSE;
 918
 919     arguments = extcap_get_if_configuration((const char *)(ifname));
 920     walker = g_list_first(arguments);
 921
 922     while (walker != NULL && !found)
 923     {
 924         item = g_list_first((GList *)(walker->data));
 925         while (item != NULL && !found)
 926         {
 927             if ((extcap_arg *)(item->data) != NULL)
 928             {
 929                 extcap_arg *arg = (extcap_arg *)(item->data);
 930                 /* Should required options be present, or any kind of options */
 931                 if (!is_required)
 932                 {
 933                     found = TRUE;
 934                 }
 935                 else if (arg->is_required)
 936                 {
 937                     const gchar *stored = NULL;
 938                     const gchar *defval = NULL;
 939
 940                     if (arg->pref_valptr != NULL)
 941                     {
 942                         stored = *arg->pref_valptr;
 943                     }
 944
 945                     if (arg->default_complex != NULL && arg->default_complex->_val != NULL)
 946                     {
 947                         defval = arg->default_complex->_val;
 948                     }
 949
 950                     if (arg->is_required)
 951                     {
 952                         /* If stored and defval is identical and the argument is required,
 953                          * configuration is needed */
 954                         if (defval && stored && g_strcmp0(stored, defval) == 0)
 955                         {
 956                             found = TRUE;
 957                         }
 958                         else if (!defval && (!stored || !*stored))
 959                         {
 960                             found = TRUE;
 961                         }
 962                     }
 963
 964                     if (arg->arg_type == EXTCAP_ARG_FILESELECT)
 965                     {
 966                         if (arg->fileexists && !(file_exists(defval) || file_exists(stored)))
 967                         {
 968                             found = TRUE;
 969                         }
 970                     }
 971                 }
 972             }
 973
 974             item = item->next;
 975         }
 976         walker = walker->next;
 977     }
 978     extcap_free_if_configuration(arguments, TRUE);
 979
 980     return found;
 981 }
 982
 983 static gboolean cb_verify_filter(extcap_callback_info_t cb_info)
 984 {
 985     extcap_filter_status *status = (extcap_filter_status *)cb_info.data;
 986     size_t output_size, i;
 987
 988     output_size = strlen(cb_info.output);
 989     if (output_size == 0) {
 990         *status = EXTCAP_FILTER_VALID;
 991     } else {
 992         *status = EXTCAP_FILTER_INVALID;
 993         for (i = 0; i < output_size; i++) {
 994             if (cb_info.output[i] == '\n' || cb_info.output[i] == '\r') {
 995                 cb_info.output[i] = '\0';
 996                 break;
 997             }
 998         }
 999         *cb_info.err_str = g_strdup(cb_info.output);
1000     }
1001
1002     return TRUE;
1003 }
1004
1005 extcap_filter_status
1006 extcap_verify_capture_filter(const char *ifname, const char *filter, gchar **err_str)
1007 {
1008     GList * arguments = NULL;
1009     extcap_filter_status status = EXTCAP_FILTER_UNKNOWN;
1010
1011     if (extcap_if_exists(ifname))
1012     {
1013         g_log(LOG_DOMAIN_CAPTURE, G_LOG_LEVEL_DEBUG, "Extcap path %s",
1014               get_extcap_dir());
1015
1016         arguments = g_list_append(arguments, g_strdup(EXTCAP_ARGUMENT_CAPTURE_FILTER));
1017         arguments = g_list_append(arguments, g_strdup(filter));
1018         arguments = g_list_append(arguments, g_strdup(EXTCAP_ARGUMENT_INTERFACE));
1019         arguments = g_list_append(arguments, g_strdup(ifname));
1020
1021         extcap_callback_info_t cb_info;
1022         cb_info.data = &status;
1023         cb_info.err_str = err_str;
1024         cb_info.ifname = ifname;
1025
1026         extcap_foreach(arguments, cb_verify_filter, cb_info, NULL);
1027         g_list_free_full(arguments, g_free);
1028     }
1029
1030     return status;
1031 }
1032
1033 gboolean
1034 extcap_has_toolbar(const char *ifname)
1035 {
1036     if (!iface_toolbar_use())
1037     {
1038         return FALSE;
1039     }
1040
1041     GList *toolbar_list = g_hash_table_get_values (_toolbars);
1042     for (GList *walker = toolbar_list; walker; walker = walker->next)
1043     {
1044         iface_toolbar *toolbar = (iface_toolbar *) walker->data;
1045         if (g_list_find_custom(toolbar->ifnames, ifname, (GCompareFunc) strcmp))
1046         {
1047             return TRUE;
1048         }
1049     }
1050
1051     return FALSE;
1052 }
1053
1054 void extcap_if_cleanup(capture_options *capture_opts, gchar **errormsg)
1055 {
1056     interface_options *interface_opts;
1057     ws_pipe_t *pipedata;
1058     guint icnt = 0;
1059     gboolean overwrite_exitcode;
1060     gchar *buffer;
1061 #define STDERR_BUFFER_SIZE 1024
1062
1063     for (icnt = 0; icnt < capture_opts->ifaces->len; icnt++)
1064     {
1065         interface_opts = &g_array_index(capture_opts->ifaces, interface_options,
1066                                        icnt);
1067
1068         /* skip native interfaces */
1069         if (interface_opts->if_type != IF_EXTCAP)
1070         {
1071             continue;
1072         }
1073
1074         overwrite_exitcode = FALSE;
1075
1076         g_log(LOG_DOMAIN_CAPTURE, G_LOG_LEVEL_DEBUG,
1077               "Extcap [%s] - Cleaning up fifo: %s; PID: %d", interface_opts->name,
1078               interface_opts->extcap_fifo, interface_opts->extcap_pid);
1079 #ifdef _WIN32
1080         if (interface_opts->extcap_pipe_h != INVALID_HANDLE_VALUE)
1081         {
1082             g_log(LOG_DOMAIN_CAPTURE, G_LOG_LEVEL_DEBUG,
1083                   "Extcap [%s] - Closing pipe", interface_opts->name);
1084             FlushFileBuffers(interface_opts->extcap_pipe_h);
1085             DisconnectNamedPipe(interface_opts->extcap_pipe_h);
1086             CloseHandle(interface_opts->extcap_pipe_h);
1087             interface_opts->extcap_pipe_h = INVALID_HANDLE_VALUE;
1088         }
1089         if (interface_opts->extcap_control_in_h != INVALID_HANDLE_VALUE)
1090         {
1091             g_log(LOG_DOMAIN_CAPTURE, G_LOG_LEVEL_DEBUG,
1092                   "Extcap [%s] - Closing control_in pipe", interface_opts->name);
1093             FlushFileBuffers(interface_opts->extcap_control_in_h);
1094             DisconnectNamedPipe(interface_opts->extcap_control_in_h);
1095             CloseHandle(interface_opts->extcap_control_in_h);
1096             interface_opts->extcap_control_in_h = INVALID_HANDLE_VALUE;
1097         }
1098         if (interface_opts->extcap_control_out_h != INVALID_HANDLE_VALUE)
1099         {
1100             g_log(LOG_DOMAIN_CAPTURE, G_LOG_LEVEL_DEBUG,
1101                   "Extcap [%s] - Closing control_out pipe", interface_opts->name);
1102             FlushFileBuffers(interface_opts->extcap_control_out_h);
1103             DisconnectNamedPipe(interface_opts->extcap_control_out_h);
1104             CloseHandle(interface_opts->extcap_control_out_h);
1105             interface_opts->extcap_control_out_h = INVALID_HANDLE_VALUE;
1106         }
1107 #else
1108         if (interface_opts->extcap_fifo != NULL && file_exists(interface_opts->extcap_fifo))
1109         {
1110             /* the fifo will not be freed here, but with the other capture_opts in capture_sync */
1111             ws_unlink(interface_opts->extcap_fifo);
1112             interface_opts->extcap_fifo = NULL;
1113         }
1114         if (interface_opts->extcap_control_in && file_exists(interface_opts->extcap_control_in))
1115         {
1116             ws_unlink(interface_opts->extcap_control_in);
1117             interface_opts->extcap_control_in = NULL;
1118         }
1119         if (interface_opts->extcap_control_out && file_exists(interface_opts->extcap_control_out))
1120         {
1121             ws_unlink(interface_opts->extcap_control_out);
1122             interface_opts->extcap_control_out = NULL;
1123         }
1124 #endif
1125         /* Maybe the client closed and removed fifo, but ws should check if
1126          * pid should be closed */
1127         g_log(LOG_DOMAIN_CAPTURE, G_LOG_LEVEL_DEBUG,
1128               "Extcap [%s] - Closing spawned PID: %d", interface_opts->name,
1129               interface_opts->extcap_pid);
1130
1131         pipedata = (ws_pipe_t *) interface_opts->extcap_pipedata;
1132         if (pipedata)
1133         {
1134             if (pipedata->stderr_fd > 0)
1135             {
1136                 buffer = (gchar *)g_malloc0(STDERR_BUFFER_SIZE + 1);
1137                 ws_read_string_from_pipe(ws_get_pipe_handle(pipedata->stderr_fd), buffer, STDERR_BUFFER_SIZE + 1);
1138                 if (strlen(buffer) > 0)
1139                 {
1140                     pipedata->stderr_msg = g_strdup_printf("%s", buffer);
1141                     pipedata->exitcode = 1;
1142                 }
1143                 g_free(buffer);
1144             }
1145
1146 #ifndef _WIN32
1147             /* Final child watch may not have been called */
1148             if (interface_opts->extcap_child_watch != 0)
1149             {
1150                 extcap_child_watch_cb(pipedata->pid, 0, capture_opts);
1151                 /* it will have changed in extcap_child_watch_cb */
1152                 interface_opts = &g_array_index(capture_opts->ifaces, interface_options,
1153                                                icnt);
1154             }
1155 #endif
1156
1157             if (pipedata->stderr_msg != NULL)
1158             {
1159                 overwrite_exitcode = TRUE;
1160             }
1161
1162             if (overwrite_exitcode || pipedata->exitcode != 0)
1163             {
1164                 if (pipedata->stderr_msg != 0)
1165                 {
1166                     if (*errormsg == NULL)
1167                     {
1168                         *errormsg = g_strdup_printf("Error by extcap pipe: %s", pipedata->stderr_msg);
1169                     }
1170                     else
1171                     {
1172                         gchar *temp = g_strconcat(*errormsg, "\nError by extcap pipe: " , pipedata->stderr_msg, NULL);
1173                         g_free(*errormsg);
1174                         *errormsg = temp;
1175                     }
1176                     g_free(pipedata->stderr_msg);
1177                 }
1178
1179                 pipedata->stderr_msg = NULL;
1180                 pipedata->exitcode = 0;
1181             }
1182         }
1183
1184         if (interface_opts->extcap_child_watch > 0)
1185         {
1186             g_source_remove(interface_opts->extcap_child_watch);
1187             interface_opts->extcap_child_watch = 0;
1188         }
1189
1190         if (pipedata->stdout_fd > 0)
1191         {
1192             ws_close(pipedata->stdout_fd);
1193         }
1194
1195         if (pipedata->stderr_fd > 0)
1196         {
1197             ws_close(pipedata->stderr_fd);
1198         }
1199
1200         if (interface_opts->extcap_pid != WS_INVALID_PID)
1201         {
1202             ws_pipe_close((ws_pipe_t *) interface_opts->extcap_pipedata);
1203             interface_opts->extcap_pid = WS_INVALID_PID;
1204
1205             g_free(interface_opts->extcap_pipedata);
1206             interface_opts->extcap_pipedata = NULL;
1207         }
1208     }
1209 }
1210
1211 static gboolean
1212 extcap_add_arg_and_remove_cb(gpointer key, gpointer value, gpointer data)
1213 {
1214     GPtrArray *args = (GPtrArray *)data;
1215
1216     if (key != NULL)
1217     {
1218         g_ptr_array_add(args, g_strdup((const gchar *)key));
1219
1220         if (value != NULL)
1221         {
1222             g_ptr_array_add(args, g_strdup((const gchar *)value));
1223         }
1224
1225         return TRUE;
1226     }
1227
1228     return FALSE;
1229 }
1230
1231 void extcap_child_watch_cb(GPid pid, gint status, gpointer user_data)
1232 {
1233     guint i;
1234     interface_options *interface_opts;
1235     ws_pipe_t *pipedata = NULL;
1236     capture_options *capture_opts = (capture_options *)(user_data);
1237
1238     if (capture_opts == NULL || capture_opts->ifaces == NULL || capture_opts->ifaces->len == 0)
1239     {
1240         return;
1241     }
1242
1243     /* Close handle to child process. */
1244     g_spawn_close_pid(pid);
1245
1246     /* Update extcap_pid in interface options structure. */
1247     for (i = 0; i < capture_opts->ifaces->len; i++)
1248     {
1249         interface_opts = &g_array_index(capture_opts->ifaces, interface_options, i);
1250         if (interface_opts->extcap_pid == pid)
1251         {
1252             pipedata = (ws_pipe_t *)interface_opts->extcap_pipedata;
1253             if (pipedata != NULL)
1254             {
1255                 interface_opts->extcap_pid = WS_INVALID_PID;
1256                 pipedata->exitcode = 0;
1257 #ifndef _WIN32
1258                 if (WIFEXITED(status))
1259                 {
1260                     if (WEXITSTATUS(status) != 0)
1261                     {
1262                         pipedata->exitcode = WEXITSTATUS(status);
1263                     }
1264                 }
1265                 else
1266                 {
1267                     pipedata->exitcode = G_SPAWN_ERROR_FAILED;
1268                 }
1269 #else
1270                 if (status != 0)
1271                 {
1272                     pipedata->exitcode = status;
1273                 }
1274 #endif
1275                 if (status == 0 && pipedata->stderr_msg != NULL)
1276                 {
1277                     pipedata->exitcode = 1;
1278                 }
1279             }
1280             g_source_remove(interface_opts->extcap_child_watch);
1281             interface_opts->extcap_child_watch = 0;
1282             break;
1283         }
1284     }
1285 }
1286
1287 static
1288 GPtrArray *extcap_prepare_arguments(interface_options *interface_opts)
1289 {
1290     GPtrArray *result = NULL;
1291
1292     if (interface_opts->if_type == IF_EXTCAP)
1293     {
1294         result = g_ptr_array_new();
1295
1296 #define add_arg(X) g_ptr_array_add(result, g_strdup(X))
1297
1298         add_arg(interface_opts->extcap);
1299         add_arg(EXTCAP_ARGUMENT_RUN_CAPTURE);
1300         add_arg(EXTCAP_ARGUMENT_INTERFACE);
1301         add_arg(interface_opts->name);
1302         if (interface_opts->cfilter && strlen(interface_opts->cfilter) > 0)
1303         {
1304             add_arg(EXTCAP_ARGUMENT_CAPTURE_FILTER);
1305             add_arg(interface_opts->cfilter);
1306         }
1307         add_arg(EXTCAP_ARGUMENT_RUN_PIPE);
1308         add_arg(interface_opts->extcap_fifo);
1309         if (interface_opts->extcap_control_in)
1310         {
1311             add_arg(EXTCAP_ARGUMENT_CONTROL_OUT);
1312             add_arg(interface_opts->extcap_control_in);
1313         }
1314         if (interface_opts->extcap_control_out)
1315         {
1316             add_arg(EXTCAP_ARGUMENT_CONTROL_IN);
1317             add_arg(interface_opts->extcap_control_out);
1318         }
1319         if (interface_opts->extcap_args == NULL || g_hash_table_size(interface_opts->extcap_args) == 0)
1320         {
1321             /* User did not perform interface configuration.
1322              *
1323              * Check if there are any boolean flags that are set by default
1324              * and hence their argument should be added.
1325              */
1326             GList *arglist;
1327             GList *elem;
1328
1329             arglist = extcap_get_if_configuration(interface_opts->name);
1330             for (elem = g_list_first(arglist); elem; elem = elem->next)
1331             {
1332                 GList *arg_list;
1333                 extcap_arg *arg_iter;
1334
1335                 if (elem->data == NULL)
1336                 {
1337                     continue;
1338                 }
1339
1340                 arg_list = g_list_first((GList *)elem->data);
1341                 while (arg_list != NULL)
1342                 {
1343                     const gchar *stored = NULL;
1344                     /* In case of boolflags only first element in arg_list is relevant. */
1345                     arg_iter = (extcap_arg *)(arg_list->data);
1346                     if (arg_iter->pref_valptr != NULL)
1347                     {
1348                         stored = *arg_iter->pref_valptr;
1349                     }
1350
1351                     if (arg_iter->arg_type == EXTCAP_ARG_BOOLFLAG)
1352                     {
1353                         if (extcap_complex_get_bool(arg_iter->default_complex))
1354                         {
1355                             add_arg(arg_iter->call);
1356                         }
1357                         else if (g_strcmp0(stored, "true") == 0)
1358                         {
1359                             add_arg(arg_iter->call);
1360                         }
1361                     }
1362                     else
1363                     {
1364                         if (stored && strlen(stored) > 0) {
1365                             add_arg(arg_iter->call);
1366                             add_arg(stored);
1367                         }
1368                     }
1369
1370                     arg_list = arg_list->next;
1371                 }
1372             }
1373
1374             extcap_free_if_configuration(arglist, TRUE);
1375         }
1376         else
1377         {
1378             g_hash_table_foreach_remove(interface_opts->extcap_args, extcap_add_arg_and_remove_cb, result);
1379         }
1380         add_arg(NULL);
1381 #undef add_arg
1382
1383     }
1384
1385     return result;
1386 }
1387
1388 static void ptr_array_free(gpointer data, gpointer user_data _U_)
1389 {
1390     g_free(data);
1391 }
1392
1393 /* call mkfifo for each extcap,
1394  * returns FALSE if there's an error creating a FIFO */
1395 gboolean
1396 extcap_init_interfaces(capture_options *capture_opts)
1397 {
1398     guint i;
1399     interface_options *interface_opts;
1400     ws_pipe_t *pipedata;
1401
1402     for (i = 0; i < capture_opts->ifaces->len; i++)
1403     {
1404         GPtrArray *args = NULL;
1405         GPid pid = WS_INVALID_PID;
1406
1407         interface_opts = &g_array_index(capture_opts->ifaces, interface_options, i);
1408
1409         /* skip native interfaces */
1410         if (interface_opts->if_type != IF_EXTCAP)
1411         {
1412             continue;
1413         }
1414
1415         /* create control pipes if having toolbar */
1416         if (extcap_has_toolbar(interface_opts->name))
1417         {
1418             extcap_create_pipe(interface_opts->name, &interface_opts->extcap_control_in,
1419                                EXTCAP_CONTROL_IN_PREFIX);
1420 #ifdef _WIN32
1421             interface_opts->extcap_control_in_h = pipe_h;
1422 #endif
1423             extcap_create_pipe(interface_opts->name, &interface_opts->extcap_control_out,
1424                                EXTCAP_CONTROL_OUT_PREFIX);
1425 #ifdef _WIN32
1426             interface_opts->extcap_control_out_h = pipe_h;
1427 #endif
1428         }
1429
1430         /* create pipe for fifo */
1431         if (!extcap_create_pipe(interface_opts->name, &interface_opts->extcap_fifo,
1432                                 EXTCAP_PIPE_PREFIX))
1433         {
1434             return FALSE;
1435         }
1436 #ifdef _WIN32
1437         interface_opts->extcap_pipe_h = pipe_h;
1438 #endif
1439
1440         /* Create extcap call */
1441         args = extcap_prepare_arguments(interface_opts);
1442
1443         pipedata = g_new0(ws_pipe_t, 1);
1444
1445         pid = ws_pipe_spawn_async(pipedata, args);
1446
1447         g_ptr_array_foreach(args, ptr_array_free, NULL);
1448         g_ptr_array_free(args, TRUE);
1449
1450         if (pid == WS_INVALID_PID)
1451         {
1452             g_free(pipedata);
1453             continue;
1454         }
1455
1456         ws_close(pipedata->stdin_fd);
1457         interface_opts->extcap_pid = pid;
1458
1459         interface_opts->extcap_child_watch =
1460             g_child_watch_add(pid, extcap_child_watch_cb, (gpointer)capture_opts);
1461
1462 #ifdef _WIN32
1463         /* On Windows, wait for extcap to connect to named pipe.
1464          * Some extcaps will present UAC screen to user.
1465          * 30 second timeout should be reasonable timeout for extcap to
1466          * connect to named pipe (including user interaction).
1467          * Wait on multiple object in case of extcap termination
1468          * without opening pipe.
1469          */
1470         if (pid != WS_INVALID_PID)
1471         {
1472             HANDLE pipe_handles[3];
1473             int num_pipe_handles = 1;
1474             pipe_handles[0] = interface_opts->extcap_pipe_h;
1475
1476             if (extcap_has_toolbar(interface_opts->name))
1477             {
1478                 pipe_handles[1] = interface_opts->extcap_control_in_h;
1479                 pipe_handles[2] = interface_opts->extcap_control_out_h;
1480                 num_pipe_handles += 2;
1481              }
1482
1483             ws_pipe_wait_for_pipe(pipe_handles, num_pipe_handles, pid);
1484         }
1485 #endif
1486
1487         interface_opts->extcap_pipedata = (gpointer) pipedata;
1488     }
1489
1490     return TRUE;
1491 }
1492
1493 #ifdef _WIN32
1494 gboolean extcap_create_pipe(const gchar *ifname, gchar **fifo, const gchar *pipe_prefix)
1495 {
1496     gchar timestr[ 14 + 1 ];
1497     time_t current_time;
1498     gchar *pipename = NULL;
1499     SECURITY_ATTRIBUTES security;
1500
1501     /* create pipename */
1502     current_time = time(NULL);
1503     /*
1504      * XXX - we trust Windows not to return a time before the Epoch here,
1505      * so we won't get a null pointer back from localtime().
1506      */
1507     strftime(timestr, sizeof(timestr), "%Y%m%d%H%M%S", localtime(&current_time));
1508     pipename = g_strconcat("\\\\.\\pipe\\", pipe_prefix, "_", ifname, "_", timestr, NULL);
1509
1510     /* Security struct to enable Inheritable HANDLE */
1511     memset(&security, 0, sizeof(SECURITY_ATTRIBUTES));
1512     security.nLength = sizeof(SECURITY_ATTRIBUTES);
1513     security.bInheritHandle = TRUE;
1514     security.lpSecurityDescriptor = NULL;
1515
1516     /* create a namedPipe */
1517     pipe_h = CreateNamedPipe(
1518                  utf_8to16(pipename),
1519                  PIPE_ACCESS_DUPLEX | FILE_FLAG_OVERLAPPED,
1520                  PIPE_TYPE_BYTE | PIPE_READMODE_BYTE | PIPE_WAIT,
1521                  1, 65536, 65536,
1522                  300,
1523                  &security);
1524
1525     if (pipe_h == INVALID_HANDLE_VALUE)
1526     {
1527         g_log(LOG_DOMAIN_CAPTURE, G_LOG_LEVEL_DEBUG, "\nError creating pipe => (%d)", GetLastError());
1528         g_free (pipename);
1529         return FALSE;
1530     }
1531     else
1532     {
1533         g_log(LOG_DOMAIN_CAPTURE, G_LOG_LEVEL_DEBUG, "\nWireshark Created pipe =>(%s)", pipename);
1534         *fifo = g_strdup(pipename);
1535     }
1536
1537     return TRUE;
1538 }
1539 #else
1540 gboolean extcap_create_pipe(const gchar *ifname, gchar **fifo, const gchar *pipe_prefix)
1541 {
1542     gchar *temp_name = NULL;
1543     int fd = 0;
1544
1545     gchar *pfx = g_strconcat(pipe_prefix, "_", ifname, NULL);
1546     if ((fd = create_tempfile(&temp_name, pfx, NULL)) < 0)
1547     {
1548         g_free(pfx);
1549         return FALSE;
1550     }
1551     g_free(pfx);
1552
1553     ws_close(fd);
1554
1555     g_log(LOG_DOMAIN_CAPTURE, G_LOG_LEVEL_DEBUG,
1556           "Extcap - Creating fifo: %s", temp_name);
1557
1558     if (file_exists(temp_name))
1559     {
1560         ws_unlink(temp_name);
1561     }
1562
1563     if (mkfifo(temp_name, 0600) == 0)
1564     {
1565         *fifo = g_strdup(temp_name);
1566     }
1567
1568     return TRUE;
1569 }
1570 #endif
1571
1572 /************* EXTCAP LOAD INTERFACE LIST ***************
1573  *
1574  * The following code handles loading and reloading the interface list. It is explicitly
1575  * kept separate from the rest
1576  */
1577
1578
1579 static void
1580 extcap_free_interface_info(gpointer data)
1581 {
1582     extcap_info *info = (extcap_info *)data;
1583
1584     g_free(info->basename);
1585     g_free(info->full_path);
1586     g_free(info->version);
1587     g_free(info->help);
1588
1589     extcap_free_interfaces(info->interfaces);
1590
1591     g_free(info);
1592 }
1593
1594 static extcap_info *
1595 extcap_ensure_interface(const gchar * toolname, gboolean create_if_nonexist)
1596 {
1597     extcap_info * element = 0;
1598
1599     if ( prefs.capture_no_extcap )
1600         return NULL;
1601
1602     if ( ! toolname )
1603         return element;
1604
1605     if ( ! _loaded_interfaces )
1606         _loaded_interfaces = g_hash_table_new_full(g_str_hash, g_str_equal, g_free, extcap_free_interface);
1607
1608     element = (extcap_info *) g_hash_table_lookup(_loaded_interfaces, toolname );
1609     if ( ! element && create_if_nonexist )
1610     {
1611         g_hash_table_insert(_loaded_interfaces, g_strdup(toolname), g_new0(extcap_info, 1));
1612         element = (extcap_info *) g_hash_table_lookup(_loaded_interfaces, toolname );
1613     }
1614
1615     return element;
1616 }
1617
1618 extcap_info *
1619 extcap_get_tool_by_ifname(const gchar *ifname)
1620 {
1621     if ( ifname && _tool_for_ifname )
1622     {
1623         gchar * toolname = (gchar *)g_hash_table_lookup(_tool_for_ifname, ifname);
1624         if ( toolname )
1625             return extcap_ensure_interface(toolname, FALSE);
1626     }
1627
1628     return NULL;
1629 }
1630
1631 extcap_info *
1632 extcap_get_tool_info(const gchar * toolname)
1633 {
1634     return extcap_ensure_interface(toolname, FALSE);
1635 }
1636
1637 static void remove_extcap_entry(gpointer entry, gpointer data _U_)
1638 {
1639     extcap_interface *int_iter = (extcap_interface*)entry;
1640
1641     if (int_iter->if_type == EXTCAP_SENTENCE_EXTCAP)
1642         extcap_free_interface(entry);
1643 }
1644
1645 static gboolean cb_load_interfaces(extcap_callback_info_t cb_info)
1646 {
1647     GList * interfaces = NULL, * control_items = NULL, * walker = NULL;
1648     extcap_interface * int_iter = NULL;
1649     extcap_info * element = NULL;
1650     iface_toolbar * toolbar_entry = NULL;
1651     gchar * toolname = g_path_get_basename(cb_info.extcap);
1652
1653     GList * interface_keys = g_hash_table_get_keys(_loaded_interfaces);
1654
1655     /* Load interfaces from utility */
1656     interfaces = extcap_parse_interfaces(cb_info.output, &control_items);
1657
1658     g_log(LOG_DOMAIN_CAPTURE, G_LOG_LEVEL_DEBUG, "Loading interface list for %s ", cb_info.extcap);
1659
1660     /* Seems, that there where no interfaces to be loaded */
1661     if ( ! interfaces || g_list_length(interfaces) == 0 )
1662     {
1663         g_log(LOG_DOMAIN_CAPTURE, G_LOG_LEVEL_DEBUG, "Cannot load interfaces for %s", cb_info.extcap );
1664         /* Some utilities, androiddump for example, may actually don't present any interfaces, even
1665          * if the utility itself is present. In such a case, we return here, but do not return
1666          * FALSE, or otherwise further loading of other utilities will be stopped */
1667         g_list_free(interface_keys);
1668         g_free(toolname);
1669         return TRUE;
1670     }
1671
1672     /* Load or create the storage element for the tool */
1673     element = extcap_ensure_interface(toolname, TRUE);
1674     if ( element == NULL )
1675     {
1676         g_log(LOG_DOMAIN_CAPTURE, G_LOG_LEVEL_ERROR, "Cannot store interface %s, maybe duplicate?", cb_info.extcap );
1677         g_list_foreach(interfaces, remove_extcap_entry, NULL);
1678         g_list_free(interfaces);
1679         g_list_free(interface_keys);
1680         g_free(toolname);
1681         return FALSE;
1682     }
1683
1684     if (control_items)
1685     {
1686         toolbar_entry = g_new0(iface_toolbar, 1);
1687         toolbar_entry->controls = control_items;
1688     }
1689
1690     walker = interfaces;
1691     gchar* help = NULL;
1692     while (walker != NULL)
1693     {
1694         int_iter = (extcap_interface *)walker->data;
1695
1696         if (int_iter->call != NULL)
1697             g_log(LOG_DOMAIN_CAPTURE, G_LOG_LEVEL_DEBUG, "Interface found %s\n", int_iter->call);
1698
1699         /* Help is not necessarily stored with the interface, but rather with the version string.
1700          * As the version string allways comes in front of the interfaces, this ensures, that it get's
1701          * properly stored with the interface */
1702         if (int_iter->if_type == EXTCAP_SENTENCE_EXTCAP)
1703         {
1704             if (int_iter->call != NULL)
1705                 g_log(LOG_DOMAIN_CAPTURE, G_LOG_LEVEL_DEBUG, "  Extcap [%s] ", int_iter->call);
1706
1707             /* Only initialize values if none are set. Need to check only one element here */
1708             if ( ! element->version )
1709             {
1710                 element->version = g_strdup(int_iter->version);
1711                 element->basename = g_strdup(toolname);
1712                 element->full_path = g_strdup(cb_info.extcap);
1713                 element->help = g_strdup(int_iter->help);
1714             }
1715
1716             help = int_iter->help;
1717             if (toolbar_entry)
1718             {
1719                 toolbar_entry->menu_title = g_strdup(int_iter->display);
1720                 toolbar_entry->help = g_strdup(int_iter->help);
1721             }
1722
1723             walker = g_list_next(walker);
1724             continue;
1725         }
1726
1727         /* Only interface definitions will be parsed here. help is already set by the extcap element,
1728          * which makes it necessary to have version in the list before the interfaces. This is normally
1729          * the case by design, but could be changed by separating the information in extcap-base. */
1730         if ( int_iter->if_type == EXTCAP_SENTENCE_INTERFACE )
1731         {
1732             if ( g_list_find(interface_keys, int_iter->call) )
1733             {
1734                 g_log(LOG_DOMAIN_CAPTURE, G_LOG_LEVEL_WARNING, "Extcap interface \"%s\" is already provided by \"%s\" ",
1735                       int_iter->call, (gchar *)extcap_if_executable(int_iter->call));
1736                 walker = g_list_next(walker);
1737                 continue;
1738             }
1739
1740             if ((int_iter->call != NULL) && (int_iter->display))
1741                 g_log(LOG_DOMAIN_CAPTURE, G_LOG_LEVEL_DEBUG, "  Interface [%s] \"%s\" ", int_iter->call, int_iter->display);
1742
1743             int_iter->extcap_path = g_strdup(cb_info.extcap);
1744
1745             /* Only set the help, if it exists and no parsed help information is present */
1746             if ( ! int_iter->help && help )
1747                 int_iter->help = g_strdup(help);
1748
1749             element->interfaces = g_list_append(element->interfaces, int_iter);
1750             g_hash_table_insert(_tool_for_ifname, g_strdup(int_iter->call), g_strdup(toolname));
1751
1752             if (toolbar_entry)
1753             {
1754                 if (!toolbar_entry->menu_title)
1755                 {
1756                     toolbar_entry->menu_title = g_strdup(int_iter->display);
1757                 }
1758                 toolbar_entry->ifnames = g_list_append(toolbar_entry->ifnames, g_strdup(int_iter->call));
1759             }
1760         }
1761
1762         walker = g_list_next(walker);
1763     }
1764
1765     if (toolbar_entry && toolbar_entry->menu_title)
1766     {
1767         iface_toolbar_add(toolbar_entry);
1768         extcap_iface_toolbar_add(cb_info.extcap, toolbar_entry);
1769     }
1770
1771     g_list_foreach(interfaces, remove_extcap_entry, NULL);
1772     g_list_free(interfaces);
1773     g_list_free(interface_keys);
1774     g_free(toolname);
1775     return TRUE;
1776 }
1777
1778
1779 /* Handles loading of the interfaces.
1780  *
1781  * A list of interfaces can be obtained by calling \ref extcap_loaded_interfaces
1782  */
1783 static void
1784 extcap_load_interface_list(void)
1785 {
1786     gchar *error = NULL;
1787
1788     if (prefs.capture_no_extcap)
1789         return;
1790
1791     if (_toolbars)
1792     {
1793         // Remove existing interface toolbars here instead of in extcap_clear_interfaces()
1794         // to avoid flicker in shown toolbars when refreshing interfaces.
1795         GList *toolbar_list = g_hash_table_get_values (_toolbars);
1796         for (GList *walker = toolbar_list; walker; walker = walker->next)
1797         {
1798             iface_toolbar *toolbar = (iface_toolbar *) walker->data;
1799             iface_toolbar_remove(toolbar->menu_title);
1800         }
1801         g_hash_table_remove_all(_toolbars);
1802     } else {
1803         _toolbars = g_hash_table_new_full(g_str_hash, g_str_equal, g_free, extcap_free_toolbar);
1804     }
1805
1806     if (_loaded_interfaces == NULL)
1807     {
1808         GList * arguments = NULL;
1809         GList * fallback = NULL;
1810         int major = 0;
1811         int minor = 0;
1812
1813         _loaded_interfaces = g_hash_table_new_full(g_str_hash, g_str_equal, g_free, extcap_free_interface_info);
1814         /* Cleanup lookup table */
1815         if ( _tool_for_ifname )
1816         {
1817             g_hash_table_remove_all(_tool_for_ifname);
1818             _tool_for_ifname = 0;
1819         } else {
1820             _tool_for_ifname = g_hash_table_new_full(g_str_hash, g_str_equal, g_free, g_free);
1821         }
1822
1823         arguments = g_list_append(arguments, g_strdup(EXTCAP_ARGUMENT_LIST_INTERFACES));
1824         fallback = g_list_append(fallback, g_strdup(EXTCAP_ARGUMENT_LIST_INTERFACES));
1825
1826         get_ws_version_number(&major, &minor, NULL);
1827         arguments = g_list_append(arguments, g_strdup_printf("%s=%d.%d", EXTCAP_ARGUMENT_VERSION, major, minor));
1828
1829         extcap_callback_info_t cb_info;
1830         cb_info.data = NULL;
1831         cb_info.ifname = NULL;
1832         cb_info.err_str = &error;
1833
1834         extcap_foreach(arguments, cb_load_interfaces, cb_info, fallback);
1835
1836         g_list_free_full(fallback, g_free);
1837         g_list_free_full(arguments, g_free);
1838     }
1839 }
1840
1841 /*
1842  * Editor modelines  -  http://www.wireshark.org/tools/modelines.html
1843  *
1844  * Local variables:
1845  * c-basic-offset: 4
1846  * tab-width: 8
1847  * indent-tabs-mode: nil
1848  * End:
1849  *
1850  * vi: set shiftwidth=4 tabstop=8 expandtab:
1851  * :indentSize=4:tabSize=8:noTabs=true:
1852  */