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  * 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 #ifdef HAVE_SYS_TYPES_H
  41 #include <sys/types.h>
  42 #endif
  43 #ifdef HAVE_SYS_WAIT_H
  44 #include <sys/wait.h>
  45 #endif
  46
  47 #include <glib.h>
  48 #include <log.h>
  49
  50 #include <epan/prefs.h>
  51
  52 #include "ui/iface_toolbar.h"
  53
  54 #include <wsutil/glib-compat.h>
  55 #include <wsutil/file_util.h>
  56 #include <wsutil/filesystem.h>
  57 #include <wsutil/tempfile.h>
  58
  59 #include "capture_opts.h"
  60
  61 #include "extcap.h"
  62 #include "extcap_parser.h"
  63 #include "extcap_spawn.h"
  64
  65 #ifdef _WIN32
  66 static HANDLE pipe_h = INVALID_HANDLE_VALUE;
  67 #endif
  68
  69 static void extcap_child_watch_cb(GPid pid, gint status, gpointer user_data);
  70
  71 /* internal container, for all the extcap executables that have been found.
  72  * Will be resetted if extcap_clear_interfaces() is being explicitly called
  73  * and is being used for printing information about all extcap interfaces found,
  74  * as well as storing all sub-interfaces
  75  */
  76 static GHashTable * _loaded_interfaces = NULL;
  77
  78 /* Internal container, which maps each ifname to the tool providing it, for faster
  79  * lookup. The key and string value are owned by this table.
  80  */
  81 static GHashTable * _tool_for_ifname = NULL;
  82
  83 /* internal container, for all the extcap executables that have been found
  84  * and that provides a toolbar with controls to be added to a Interface Toolbar
  85  */
  86 static GHashTable *_toolbars = NULL;
  87
  88 /* internal container, to map preference names to pointers that hold preference
  89  * values. These ensure that preferences can survive extcap if garbage
  90  * collection, and does not lead to dangling pointers in the prefs subsystem.
  91  */
  92 static GHashTable *extcap_prefs_dynamic_vals = NULL;
  93
  94 typedef struct _extcap_callback_info_t
  95 {
  96     const gchar * extcap;
  97     const gchar * ifname;
  98     gchar * output;
  99     void * data;
 100     gchar ** err_str;
 101 } extcap_callback_info_t;
 102
 103 /* Callback definition for extcap_foreach */
 104 typedef gboolean(*extcap_cb_t)(extcap_callback_info_t info_structure);
 105
 106 static void extcap_load_interface_list(void);
 107
 108 GHashTable *
 109 extcap_loaded_interfaces(void)
 110 {
 111     if ( !_loaded_interfaces || g_hash_table_size(_loaded_interfaces) == 0 )
 112         extcap_load_interface_list();
 113
 114     return _loaded_interfaces;
 115 }
 116
 117 void
 118 extcap_clear_interfaces(void)
 119 {
 120     if ( _loaded_interfaces )
 121         g_hash_table_destroy(_loaded_interfaces);
 122     _loaded_interfaces = NULL;
 123
 124     if ( _tool_for_ifname )
 125         g_hash_table_destroy(_tool_for_ifname);
 126     _tool_for_ifname = NULL;
 127 }
 128
 129 guint extcap_count(void)
 130 {
 131     const char *dirname = get_extcap_dir();
 132     GDir *dir;
 133     guint count;
 134
 135     count = 0;
 136
 137     if ((dir = g_dir_open(dirname, 0, NULL)) != NULL)
 138     {
 139         GString *extcap_path = NULL;
 140         const gchar *file;
 141
 142         extcap_path = g_string_new("");
 143         while ((file = g_dir_read_name(dir)) != NULL)
 144         {
 145             /* full path to extcap binary */
 146             g_string_printf(extcap_path, "%s" G_DIR_SEPARATOR_S "%s", dirname, file);
 147             /* treat anything executable as an extcap binary */
 148             if (g_file_test(extcap_path->str, G_FILE_TEST_IS_REGULAR) &&
 149                 g_file_test(extcap_path->str, G_FILE_TEST_IS_EXECUTABLE))
 150             {
 151                 count++;
 152             }
 153         }
 154
 155         g_dir_close(dir);
 156         g_string_free(extcap_path, TRUE);
 157     }
 158     return count;
 159 }
 160
 161 static gboolean
 162 extcap_if_exists(const gchar *ifname)
 163 {
 164     if (!ifname || !_tool_for_ifname)
 165     {
 166         return FALSE;
 167     }
 168
 169     if (g_hash_table_lookup(_tool_for_ifname, ifname))
 170     {
 171         return TRUE;
 172     }
 173
 174     return FALSE;
 175 }
 176
 177 static extcap_interface *
 178 extcap_find_interface_for_ifname(const gchar *ifname)
 179 {
 180     extcap_interface * result = NULL;
 181
 182     if ( !ifname || ! _tool_for_ifname || ! _loaded_interfaces )
 183         return result;
 184
 185     gchar * extcap_util = (gchar *)g_hash_table_lookup(_tool_for_ifname, ifname);
 186     if ( ! extcap_util )
 187         return result;
 188
 189     extcap_info * element = (extcap_info *)g_hash_table_lookup(_loaded_interfaces, extcap_util);
 190     if ( ! element )
 191         return result;
 192
 193     GList * walker = element->interfaces;
 194     while ( walker && walker->data && ! result )
 195     {
 196         extcap_interface * interface = (extcap_interface *)walker->data;
 197         if ( g_strcmp0(interface->call, ifname) == 0 )
 198         {
 199             result = interface;
 200             break;
 201         }
 202
 203         walker = g_list_next ( walker );
 204     }
 205
 206     return result;
 207 }
 208
 209 static void
 210 extcap_free_toolbar_value(iface_toolbar_value *value)
 211 {
 212     if (!value)
 213     {
 214         return;
 215     }
 216
 217     g_free(value->value);
 218     g_free(value->display);
 219     g_free(value);
 220 }
 221
 222 static void
 223 extcap_free_toolbar_control(iface_toolbar_control *control)
 224 {
 225     if (!control)
 226     {
 227         return;
 228     }
 229
 230     g_free(control->display);
 231     g_free(control->validation);
 232     g_free(control->tooltip);
 233     if (control->ctrl_type == INTERFACE_TYPE_STRING) {
 234         g_free(control->default_value.string);
 235     }
 236     g_list_foreach(control->values, (GFunc)extcap_free_toolbar_value, NULL);
 237     g_list_free(control->values);
 238     g_free(control);
 239 }
 240
 241 static void
 242 extcap_free_toolbar(gpointer data)
 243 {
 244     if (!data)
 245     {
 246         return;
 247     }
 248
 249     iface_toolbar *toolbar = (iface_toolbar *)data;
 250
 251     g_free(toolbar->menu_title);
 252     g_free(toolbar->help);
 253     g_list_free_full(toolbar->ifnames, g_free);
 254     g_list_foreach(toolbar->controls, (GFunc)extcap_free_toolbar_control, NULL);
 255     g_list_free(toolbar->controls);
 256     g_free(toolbar);
 257 }
 258
 259 static gboolean
 260 extcap_if_exists_for_extcap(const gchar *ifname, const gchar *extcap)
 261 {
 262     extcap_interface *entry = extcap_find_interface_for_ifname(ifname);
 263
 264     if (entry && strcmp(entry->extcap_path, extcap) == 0)
 265     {
 266         return TRUE;
 267     }
 268
 269     return FALSE;
 270 }
 271
 272 static gchar *
 273 extcap_if_executable(const gchar *ifname)
 274 {
 275     extcap_interface *interface = extcap_find_interface_for_ifname(ifname);
 276     return interface != NULL ? interface->extcap_path : NULL;
 277 }
 278
 279 static void
 280 extcap_iface_toolbar_add(const gchar *extcap, iface_toolbar *toolbar_entry)
 281 {
 282     char *toolname;
 283
 284     if (!extcap || !toolbar_entry)
 285     {
 286         return;
 287     }
 288
 289     toolname = g_path_get_basename(extcap);
 290
 291     if (!g_hash_table_lookup(_toolbars, toolname))
 292     {
 293         g_hash_table_insert(_toolbars, g_strdup(toolname), toolbar_entry);
 294     }
 295
 296     g_free(toolname);
 297 }
 298
 299 /* Note: args does not need to be NULL-terminated. */
 300 static gboolean extcap_foreach(gint argc, gchar **args,
 301                                       extcap_cb_t cb, extcap_callback_info_t cb_info)
 302 {
 303     GDir *dir;
 304     gboolean keep_going;
 305     const char *dirname = get_extcap_dir();
 306
 307     keep_going = TRUE;
 308
 309     if ((dir = g_dir_open(dirname, 0, NULL)) != NULL)
 310     {
 311         GString *extcap_path = NULL;
 312         const gchar *file;
 313
 314         extcap_path = g_string_new("");
 315         while (keep_going && (file = g_dir_read_name(dir)) != NULL)
 316         {
 317             gchar *command_output = NULL;
 318
 319             /* full path to extcap binary */
 320             g_string_printf(extcap_path, "%s" G_DIR_SEPARATOR_S "%s", dirname, file);
 321             /* treat anything executable as an extcap binary */
 322             if (g_file_test(extcap_path->str, G_FILE_TEST_IS_REGULAR) &&
 323                 g_file_test(extcap_path->str, G_FILE_TEST_IS_EXECUTABLE))
 324             {
 325                 if (extcap_if_exists(cb_info.ifname) && !extcap_if_exists_for_extcap(cb_info.ifname, extcap_path->str))
 326                 {
 327                     continue;
 328                 }
 329
 330                 if (extcap_spawn_sync((gchar *) dirname, extcap_path->str, argc, args, &command_output))
 331                 {
 332                     cb_info.output = command_output;
 333                     cb_info.extcap = extcap_path->str;
 334
 335                     keep_going = cb(cb_info);
 336                 }
 337
 338                 g_free(command_output);
 339             }
 340         }
 341
 342         g_dir_close(dir);
 343         g_string_free(extcap_path, TRUE);
 344     }
 345
 346     return keep_going;
 347 }
 348
 349 static void extcap_free_dlt(gpointer d, gpointer user_data _U_)
 350 {
 351     if (d == NULL)
 352     {
 353         return;
 354     }
 355
 356     g_free(((extcap_dlt *)d)->name);
 357     g_free(((extcap_dlt *)d)->display);
 358     g_free(d);
 359 }
 360
 361 static void extcap_free_dlts(GList *dlts)
 362 {
 363     g_list_foreach(dlts, extcap_free_dlt, NULL);
 364     g_list_free(dlts);
 365 }
 366
 367 static gboolean cb_dlt(extcap_callback_info_t cb_info)
 368 {
 369     GList *dlts = NULL, *temp = NULL;
 370
 371     if_capabilities_t *caps;
 372     GList *linktype_list = NULL;
 373     data_link_info_t *data_link_info;
 374     extcap_dlt *dlt_item;
 375
 376     dlts = extcap_parse_dlts(cb_info.output);
 377     temp = dlts;
 378
 379     g_log(LOG_DOMAIN_CAPTURE, G_LOG_LEVEL_DEBUG, "Extcap pipe %s ", cb_info.extcap);
 380
 381     /*
 382      * Allocate the interface capabilities structure.
 383      */
 384     caps = (if_capabilities_t *) g_malloc(sizeof * caps);
 385     caps->can_set_rfmon = FALSE;
 386     caps->timestamp_types = NULL;
 387
 388     while (dlts)
 389     {
 390         dlt_item = (extcap_dlt *)dlts->data;
 391         if (dlt_item)
 392         {
 393             g_log(LOG_DOMAIN_CAPTURE, G_LOG_LEVEL_DEBUG,
 394                   "  DLT %d name=\"%s\" display=\"%s\" ", dlt_item->number,
 395                   dlt_item->name, dlt_item->display);
 396
 397             data_link_info = g_new(data_link_info_t, 1);
 398             data_link_info->dlt = dlt_item->number;
 399             data_link_info->name = g_strdup(dlt_item->name);
 400             data_link_info->description = g_strdup(dlt_item->display);
 401             linktype_list = g_list_append(linktype_list, data_link_info);
 402         }
 403
 404         dlts = g_list_next(dlts);
 405     }
 406
 407     /* Check to see if we built a list */
 408     if (linktype_list != NULL && cb_info.data != NULL)
 409     {
 410         caps->data_link_types = linktype_list;
 411         *(if_capabilities_t **) cb_info.data = caps;
 412     }
 413     else
 414     {
 415         if (cb_info.err_str)
 416         {
 417             g_log(LOG_DOMAIN_CAPTURE, G_LOG_LEVEL_DEBUG, "  returned no DLTs");
 418             *(cb_info.err_str) = g_strdup("Extcap returned no DLTs");
 419         }
 420         g_free(caps);
 421     }
 422
 423     extcap_free_dlts(temp);
 424
 425     return FALSE;
 426 }
 427
 428 if_capabilities_t *
 429 extcap_get_if_dlts(const gchar *ifname, char **err_str)
 430 {
 431     gchar *argv[3];
 432     gint i;
 433     if_capabilities_t *caps = NULL;
 434
 435     if (err_str != NULL)
 436     {
 437         *err_str = NULL;
 438     }
 439
 440     if (extcap_if_exists(ifname))
 441     {
 442         argv[0] = g_strdup(EXTCAP_ARGUMENT_LIST_DLTS);
 443         argv[1] = g_strdup(EXTCAP_ARGUMENT_INTERFACE);
 444         argv[2] = g_strdup(ifname);
 445
 446         extcap_callback_info_t cb_info;
 447         cb_info.data = &caps;
 448         cb_info.err_str = err_str;
 449         cb_info.ifname = ifname;
 450
 451         extcap_foreach(3, argv, cb_dlt, cb_info);
 452
 453         for (i = 0; i < 3; ++i)
 454         {
 455             g_free(argv[i]);
 456         }
 457     }
 458
 459     return caps;
 460 }
 461
 462 static void extcap_free_interface(gpointer i)
 463 {
 464
 465     extcap_interface *interface = (extcap_interface *)i;
 466
 467     if (i == NULL)
 468     {
 469         return;
 470     }
 471
 472     g_free(interface->call);
 473     g_free(interface->display);
 474     g_free(interface->version);
 475     g_free(interface->help);
 476     g_free(interface->extcap_path);
 477     g_free(interface);
 478 }
 479
 480 static void extcap_free_interfaces(GList *interfaces)
 481 {
 482     if (interfaces == NULL)
 483     {
 484         return;
 485     }
 486
 487     g_list_foreach(interfaces, (GFunc)extcap_free_interface, NULL);
 488     g_list_free(interfaces);
 489 }
 490
 491 static gint
 492 if_info_compare(gconstpointer a, gconstpointer b)
 493 {
 494     gint comp = 0;
 495     const if_info_t *if_a = (const if_info_t *)a;
 496     const if_info_t *if_b = (const if_info_t *)b;
 497
 498     if ((comp = g_strcmp0(if_a->name, if_b->name)) == 0)
 499     {
 500         return g_strcmp0(if_a->friendly_name, if_b->friendly_name);
 501     }
 502
 503     return comp;
 504 }
 505
 506 gchar *
 507 extcap_get_help_for_ifname(const char *ifname)
 508 {
 509     extcap_interface *interface = extcap_find_interface_for_ifname(ifname);
 510     return interface != NULL ? interface->help : NULL;
 511 }
 512
 513 GList *
 514 append_extcap_interface_list(GList *list, char **err_str _U_)
 515 {
 516     GList *interface_list = NULL;
 517     extcap_interface *data = NULL;
 518     GList *ifutilkeys_head = NULL, *ifutilkeys = NULL;
 519
 520     /* Update the extcap interfaces and get a list of their if_infos */
 521     if ( !_loaded_interfaces || g_hash_table_size(_loaded_interfaces) == 0 )
 522         extcap_load_interface_list();
 523
 524     ifutilkeys_head = g_hash_table_get_keys(_loaded_interfaces);
 525     ifutilkeys = ifutilkeys_head;
 526     while ( ifutilkeys && ifutilkeys->data )
 527     {
 528         extcap_info * extinfo =
 529                 (extcap_info *) g_hash_table_lookup(_loaded_interfaces, (gchar *)ifutilkeys->data);
 530         GList * walker = extinfo->interfaces;
 531         while ( walker && walker->data )
 532         {
 533             interface_list = g_list_append(interface_list, walker->data);
 534             walker = g_list_next(walker);
 535         }
 536
 537         ifutilkeys = g_list_next(ifutilkeys);
 538     }
 539     g_list_free(ifutilkeys_head);
 540
 541     /* Sort that list */
 542     interface_list = g_list_sort(interface_list, if_info_compare);
 543
 544     /* Append the interfaces in that list to the list we're handed. */
 545     while (interface_list != NULL)
 546     {
 547         GList *entry = g_list_first(interface_list);
 548         data = (extcap_interface *)entry->data;
 549         interface_list = g_list_delete_link(interface_list, entry);
 550
 551         if_info_t * if_info = g_new0(if_info_t, 1);
 552         if_info->name = g_strdup(data->call);
 553         if_info->friendly_name = g_strdup(data->display);
 554
 555         if_info->type = IF_EXTCAP;
 556
 557         if_info->extcap = g_strdup(data->extcap_path);
 558
 559         list = g_list_append(list, if_info);
 560     }
 561
 562     return list;
 563 }
 564
 565 static void
 566 extcap_register_preferences_callback(gpointer key, gpointer value _U_, gpointer user_data _U_)
 567 {
 568     GList *arguments;
 569
 570     arguments = extcap_get_if_configuration((gchar *)key);
 571     /* Memory for prefs are external to an interface, they are part of
 572      * extcap core, so the parsed arguments can be freed. */
 573     extcap_free_if_configuration(arguments, TRUE);
 574 }
 575
 576 void extcap_register_preferences(void)
 577 {
 578     module_t *dev_module = prefs_find_module("extcap");
 579
 580     if (!dev_module)
 581     {
 582         return;
 583     }
 584
 585     if ( !_loaded_interfaces || g_hash_table_size(_loaded_interfaces) == 0 )
 586         extcap_load_interface_list();
 587
 588
 589     g_hash_table_foreach(_tool_for_ifname, extcap_register_preferences_callback, NULL);
 590 }
 591
 592 /**
 593  * Releases the dynamic preference value pointers. Must not be called before
 594  * prefs_cleanup since these pointers could still be in use.
 595  */
 596 void extcap_cleanup(void)
 597 {
 598     if (extcap_prefs_dynamic_vals)
 599         g_hash_table_destroy(extcap_prefs_dynamic_vals);
 600
 601     if (_loaded_interfaces)
 602         g_hash_table_destroy(_loaded_interfaces);
 603
 604     if (_tool_for_ifname)
 605         g_hash_table_destroy(_tool_for_ifname);
 606 }
 607
 608 void extcap_pref_store(extcap_arg *arg, const char *newval)
 609 {
 610     if (arg && arg->pref_valptr != NULL)
 611     {
 612         g_free(*arg->pref_valptr);
 613         *arg->pref_valptr = g_strdup(newval);
 614     }
 615
 616 }
 617
 618 /**
 619  * Obtains a pointer which can store a value for the given preference name.
 620  * The preference name that can be passed to the prefs API is stored into
 621  * 'prefs_name'.
 622  *
 623  * Extcap interfaces (and their preferences) are dynamic, they can be created
 624  * and destroyed at will. Thus their data structures are insufficient to pass to
 625  * the preferences APIs which require pointers which are valid until the
 626  * preferences are removed (at exit).
 627  */
 628 static gchar **extcap_prefs_dynamic_valptr(const char *name, char **pref_name)
 629 {
 630     gchar **valp;
 631     if (!extcap_prefs_dynamic_vals)
 632     {
 633         /* Initialize table only as needed, most preferences are not dynamic */
 634         extcap_prefs_dynamic_vals = g_hash_table_new_full(g_str_hash, g_str_equal,
 635                                     g_free, g_free);
 636     }
 637     if (!g_hash_table_lookup_extended(extcap_prefs_dynamic_vals, name,
 638                                       (gpointer *)pref_name, (gpointer *)&valp))
 639     {
 640         /* New dynamic pref, allocate, initialize and store. */
 641         valp = g_new0(gchar *, 1);
 642         *pref_name = g_strdup(name);
 643         g_hash_table_insert(extcap_prefs_dynamic_vals, *pref_name, valp);
 644     }
 645     return valp;
 646 }
 647
 648 void extcap_free_if_configuration(GList *list, gboolean free_args)
 649 {
 650     GList *elem, *sl;
 651
 652     for (elem = g_list_first(list); elem; elem = elem->next)
 653     {
 654         if (elem->data != NULL)
 655         {
 656             sl = g_list_first((GList *)elem->data);
 657             if (free_args)
 658             {
 659                 extcap_free_arg_list(sl);
 660             }
 661             else
 662             {
 663                 g_list_free(sl);
 664             }
 665         }
 666     }
 667     g_list_free(list);
 668 }
 669
 670 struct preference *
 671 extcap_pref_for_argument(const gchar *ifname, struct _extcap_arg *arg)
 672 {
 673     struct preference *pref = NULL;
 674
 675     GRegex *regex_name = g_regex_new("[-]+", (GRegexCompileFlags) 0, (GRegexMatchFlags) 0, NULL);
 676     GRegex *regex_ifname = g_regex_new("(?![a-zA-Z1-9_]).", (GRegexCompileFlags) 0, (GRegexMatchFlags) 0, NULL);
 677     if (regex_name && regex_ifname)
 678     {
 679         if (prefs_find_module("extcap"))
 680         {
 681             gchar *pref_name = g_regex_replace(regex_name, arg->call, strlen(arg->call), 0, "", (GRegexMatchFlags) 0, NULL);
 682             gchar *ifname_underscore = g_regex_replace(regex_ifname, ifname, strlen(ifname), 0, "_", (GRegexMatchFlags) 0, NULL);
 683             gchar *ifname_lowercase = g_ascii_strdown(ifname_underscore, -1);
 684             gchar *pref_ifname = g_strconcat(ifname_lowercase, ".", pref_name, NULL);
 685
 686             pref = prefs_find_preference(prefs_find_module("extcap"), pref_ifname);
 687
 688             g_free(pref_name);
 689             g_free(ifname_underscore);
 690             g_free(ifname_lowercase);
 691             g_free(pref_ifname);
 692         }
 693     }
 694     if (regex_name)
 695     {
 696         g_regex_unref(regex_name);
 697     }
 698     if (regex_ifname)
 699     {
 700         g_regex_unref(regex_ifname);
 701     }
 702
 703     return pref;
 704 }
 705
 706 static gboolean cb_preference(extcap_callback_info_t cb_info)
 707 {
 708     GList *arguments = NULL;
 709     GList **il = (GList **) cb_info.data;
 710     module_t *dev_module = NULL;
 711
 712     arguments = extcap_parse_args(cb_info.output);
 713
 714     dev_module = prefs_find_module("extcap");
 715
 716     if (dev_module)
 717     {
 718         GList *walker = arguments;
 719
 720         GRegex *regex_name = g_regex_new("[-]+", (GRegexCompileFlags) 0, (GRegexMatchFlags) 0, NULL);
 721         GRegex *regex_ifname = g_regex_new("(?![a-zA-Z1-9_]).", (GRegexCompileFlags) 0, (GRegexMatchFlags) 0, NULL);
 722         if (regex_name && regex_ifname)
 723         {
 724             while (walker != NULL)
 725             {
 726                 extcap_arg *arg = (extcap_arg *)walker->data;
 727                 arg->device_name = g_strdup(cb_info.ifname);
 728
 729                 if (arg->save)
 730                 {
 731                     struct preference *pref = NULL;
 732
 733                     gchar *pref_name = g_regex_replace(regex_name, arg->call, strlen(arg->call), 0, "", (GRegexMatchFlags) 0, NULL);
 734                     gchar *ifname_underscore = g_regex_replace(regex_ifname, cb_info.ifname, strlen(cb_info.ifname), 0, "_", (GRegexMatchFlags) 0, NULL);
 735                     gchar *ifname_lowercase = g_ascii_strdown(ifname_underscore, -1);
 736                     gchar *pref_ifname = g_strconcat(ifname_lowercase, ".", pref_name, NULL);
 737
 738                     if ((pref = prefs_find_preference(dev_module, pref_ifname)) == NULL)
 739                     {
 740                         char *pref_name_for_prefs;
 741                         char *pref_title = wmem_strdup(wmem_epan_scope(), arg->display);
 742
 743                         arg->pref_valptr = extcap_prefs_dynamic_valptr(pref_ifname, &pref_name_for_prefs);
 744                         /* Set an initial value if any (the string will be copied at registration) */
 745                         if (arg->default_complex)
 746                         {
 747                             *arg->pref_valptr = arg->default_complex->_val;
 748                         }
 749
 750                         prefs_register_string_preference(dev_module, pref_name_for_prefs,
 751                                                          pref_title, pref_title, (const char **)arg->pref_valptr);
 752                     }
 753                     else
 754                     {
 755                         /* Been here before, restore stored value */
 756                         if (arg->pref_valptr == NULL)
 757                         {
 758                             arg->pref_valptr = (gchar**)g_hash_table_lookup(extcap_prefs_dynamic_vals, pref_ifname);
 759                         }
 760                     }
 761
 762                     g_free(pref_name);
 763                     g_free(ifname_underscore);
 764                     g_free(ifname_lowercase);
 765                     g_free(pref_ifname);
 766                 }
 767
 768                 walker = g_list_next(walker);
 769             }
 770         }
 771         if (regex_name)
 772         {
 773             g_regex_unref(regex_name);
 774         }
 775         if (regex_ifname)
 776         {
 777             g_regex_unref(regex_ifname);
 778         }
 779     }
 780
 781     *il = g_list_append(*il, arguments);
 782
 783     /* By returning false, extcap_foreach will break on first found */
 784     return TRUE;
 785 }
 786
 787 GList *
 788 extcap_get_if_configuration(const char *ifname)
 789 {
 790     gchar *argv[3];
 791     GList *ret = NULL;
 792     gchar **err_str = NULL;
 793     int i;
 794
 795     if (extcap_if_exists(ifname))
 796     {
 797         g_log(LOG_DOMAIN_CAPTURE, G_LOG_LEVEL_DEBUG, "Extcap path %s",
 798               get_extcap_dir());
 799
 800         argv[0] = g_strdup(EXTCAP_ARGUMENT_CONFIG);
 801         argv[1] = g_strdup(EXTCAP_ARGUMENT_INTERFACE);
 802         argv[2] = g_strdup(ifname);
 803
 804         extcap_callback_info_t cb_info;
 805         cb_info.data = &ret;
 806         cb_info.err_str = err_str;
 807         cb_info.ifname = ifname;
 808
 809         extcap_foreach(3, argv, cb_preference, cb_info);
 810
 811         for (i = 0; i < 3; i++)
 812         {
 813             g_free(argv[i]);
 814         }
 815     }
 816
 817     return ret;
 818 }
 819
 820 /**
 821  * If is_required is FALSE: returns TRUE if the extcap interface has
 822  * configurable options.
 823  * If is_required is TRUE: returns TRUE when the extcap interface has
 824  * configurable options that required modification. (For example, when an
 825  * argument is required but empty.)
 826  */
 827 gboolean
 828 extcap_has_configuration(const char *ifname, gboolean is_required)
 829 {
 830     GList *arguments = 0;
 831     GList *walker = 0, * item = 0;
 832
 833     gboolean found = FALSE;
 834
 835     arguments = extcap_get_if_configuration((const char *)(ifname));
 836     walker = g_list_first(arguments);
 837
 838     while (walker != NULL && !found)
 839     {
 840         item = g_list_first((GList *)(walker->data));
 841         while (item != NULL && !found)
 842         {
 843             if ((extcap_arg *)(item->data) != NULL)
 844             {
 845                 extcap_arg *arg = (extcap_arg *)(item->data);
 846                 /* Should required options be present, or any kind of options */
 847                 if (!is_required)
 848                 {
 849                     found = TRUE;
 850                 }
 851                 else if (arg->is_required)
 852                 {
 853                     const gchar *stored = NULL;
 854                     const gchar *defval = NULL;
 855
 856                     if (arg->pref_valptr != NULL)
 857                     {
 858                         stored = *arg->pref_valptr;
 859                     }
 860
 861                     if (arg->default_complex != NULL && arg->default_complex->_val != NULL)
 862                     {
 863                         defval = arg->default_complex->_val;
 864                     }
 865
 866                     if (arg->is_required)
 867                     {
 868                         /* If stored and defval is identical and the argument is required,
 869                          * configuration is needed */
 870                         if (defval && stored && g_strcmp0(stored, defval) == 0)
 871                         {
 872                             found = TRUE;
 873                         }
 874                         else if (!defval && (!stored || !*stored))
 875                         {
 876                             found = TRUE;
 877                         }
 878                     }
 879
 880                     if (arg->arg_type == EXTCAP_ARG_FILESELECT)
 881                     {
 882                         if (arg->fileexists && !(file_exists(defval) || file_exists(stored)))
 883                         {
 884                             found = TRUE;
 885                         }
 886                     }
 887                 }
 888             }
 889
 890             item = item->next;
 891         }
 892         walker = walker->next;
 893     }
 894     extcap_free_if_configuration(arguments, TRUE);
 895
 896     return found;
 897 }
 898
 899 static gboolean cb_verify_filter(extcap_callback_info_t cb_info)
 900 {
 901     extcap_filter_status *status = (extcap_filter_status *)cb_info.data;
 902     size_t output_size, i;
 903
 904     output_size = strlen(cb_info.output);
 905     if (output_size == 0) {
 906         *status = EXTCAP_FILTER_VALID;
 907     } else {
 908         *status = EXTCAP_FILTER_INVALID;
 909         for (i = 0; i < output_size; i++) {
 910             if (cb_info.output[i] == '\n' || cb_info.output[i] == '\r') {
 911                 cb_info.output[i] = '\0';
 912                 break;
 913             }
 914         }
 915         *cb_info.err_str = g_strdup(cb_info.output);
 916     }
 917
 918     return TRUE;
 919 }
 920
 921 extcap_filter_status
 922 extcap_verify_capture_filter(const char *ifname, const char *filter, gchar **err_str)
 923 {
 924     gchar *argv[4];
 925     extcap_filter_status status = EXTCAP_FILTER_UNKNOWN;
 926
 927     if (extcap_if_exists(ifname))
 928     {
 929         g_log(LOG_DOMAIN_CAPTURE, G_LOG_LEVEL_DEBUG, "Extcap path %s",
 930               get_extcap_dir());
 931
 932         argv[0] = EXTCAP_ARGUMENT_CAPTURE_FILTER;
 933         argv[1] = (gchar*)filter;
 934         argv[2] = EXTCAP_ARGUMENT_INTERFACE;
 935         argv[3] = (gchar*)ifname;
 936
 937         extcap_callback_info_t cb_info;
 938         cb_info.data = &status;
 939         cb_info.err_str = err_str;
 940         cb_info.ifname = ifname;
 941
 942         extcap_foreach(4, argv, cb_verify_filter, cb_info);
 943     }
 944
 945     return status;
 946 }
 947
 948 gboolean
 949 extcap_has_toolbar(const char *ifname)
 950 {
 951     if (!iface_toolbar_use())
 952     {
 953         return FALSE;
 954     }
 955
 956     GList *toolbar_list = g_hash_table_get_values (_toolbars);
 957     for (GList *walker = toolbar_list; walker; walker = walker->next)
 958     {
 959         iface_toolbar *toolbar = (iface_toolbar *) walker->data;
 960         if (g_list_find_custom(toolbar->ifnames, ifname, (GCompareFunc) strcmp))
 961         {
 962             return TRUE;
 963         }
 964     }
 965
 966     return FALSE;
 967 }
 968
 969 /* taken from capchild/capture_sync.c */
 970 static gboolean pipe_data_available(int pipe_fd)
 971 {
 972 #ifdef _WIN32 /* PeekNamedPipe */
 973     HANDLE hPipe = (HANDLE) _get_osfhandle(pipe_fd);
 974     DWORD bytes_avail;
 975
 976     if (hPipe == INVALID_HANDLE_VALUE)
 977     {
 978         return FALSE;
 979     }
 980
 981     if (! PeekNamedPipe(hPipe, NULL, 0, NULL, &bytes_avail, NULL))
 982     {
 983         return FALSE;
 984     }
 985
 986     if (bytes_avail > 0)
 987     {
 988         return TRUE;
 989     }
 990     return FALSE;
 991 #else /* select */
 992     fd_set rfds;
 993     struct timeval timeout;
 994
 995     FD_ZERO(&rfds);
 996     FD_SET(pipe_fd, &rfds);
 997     timeout.tv_sec = 0;
 998     timeout.tv_usec = 0;
 999
1000     if (select(pipe_fd + 1, &rfds, NULL, NULL, &timeout) > 0)
1001     {
1002         return TRUE;
1003     }
1004
1005     return FALSE;
1006 #endif
1007 }
1008
1009 void extcap_if_cleanup(capture_options *capture_opts, gchar **errormsg)
1010 {
1011     interface_options *interface_opts;
1012     extcap_userdata *userdata;
1013     guint icnt = 0;
1014     gboolean overwrite_exitcode;
1015     gchar *buffer;
1016 #define STDERR_BUFFER_SIZE 1024
1017
1018     for (icnt = 0; icnt < capture_opts->ifaces->len; icnt++)
1019     {
1020         interface_opts = &g_array_index(capture_opts->ifaces, interface_options,
1021                                        icnt);
1022
1023         /* skip native interfaces */
1024         if (interface_opts->if_type != IF_EXTCAP)
1025         {
1026             continue;
1027         }
1028
1029         overwrite_exitcode = FALSE;
1030
1031         g_log(LOG_DOMAIN_CAPTURE, G_LOG_LEVEL_DEBUG,
1032               "Extcap [%s] - Cleaning up fifo: %s; PID: %d", interface_opts->name,
1033               interface_opts->extcap_fifo, interface_opts->extcap_pid);
1034 #ifdef _WIN32
1035         if (interface_opts->extcap_pipe_h != INVALID_HANDLE_VALUE)
1036         {
1037             g_log(LOG_DOMAIN_CAPTURE, G_LOG_LEVEL_DEBUG,
1038                   "Extcap [%s] - Closing pipe", interface_opts->name);
1039             FlushFileBuffers(interface_opts->extcap_pipe_h);
1040             DisconnectNamedPipe(interface_opts->extcap_pipe_h);
1041             CloseHandle(interface_opts->extcap_pipe_h);
1042             interface_opts->extcap_pipe_h = INVALID_HANDLE_VALUE;
1043         }
1044         if (interface_opts->extcap_control_in_h != INVALID_HANDLE_VALUE)
1045         {
1046             g_log(LOG_DOMAIN_CAPTURE, G_LOG_LEVEL_DEBUG,
1047                   "Extcap [%s] - Closing control_in pipe", interface_opts->name);
1048             FlushFileBuffers(interface_opts->extcap_control_in_h);
1049             DisconnectNamedPipe(interface_opts->extcap_control_in_h);
1050             CloseHandle(interface_opts->extcap_control_in_h);
1051             interface_opts->extcap_control_in_h = INVALID_HANDLE_VALUE;
1052         }
1053         if (interface_opts->extcap_control_out_h != INVALID_HANDLE_VALUE)
1054         {
1055             g_log(LOG_DOMAIN_CAPTURE, G_LOG_LEVEL_DEBUG,
1056                   "Extcap [%s] - Closing control_out pipe", interface_opts->name);
1057             FlushFileBuffers(interface_opts->extcap_control_out_h);
1058             DisconnectNamedPipe(interface_opts->extcap_control_out_h);
1059             CloseHandle(interface_opts->extcap_control_out_h);
1060             interface_opts->extcap_control_out_h = INVALID_HANDLE_VALUE;
1061         }
1062 #else
1063         if (interface_opts->extcap_fifo != NULL && file_exists(interface_opts->extcap_fifo))
1064         {
1065             /* the fifo will not be freed here, but with the other capture_opts in capture_sync */
1066             ws_unlink(interface_opts->extcap_fifo);
1067             interface_opts->extcap_fifo = NULL;
1068         }
1069         if (interface_opts->extcap_control_in && file_exists(interface_opts->extcap_control_in))
1070         {
1071             ws_unlink(interface_opts->extcap_control_in);
1072             interface_opts->extcap_control_in = NULL;
1073         }
1074         if (interface_opts->extcap_control_out && file_exists(interface_opts->extcap_control_out))
1075         {
1076             ws_unlink(interface_opts->extcap_control_out);
1077             interface_opts->extcap_control_out = NULL;
1078         }
1079 #endif
1080         /* Maybe the client closed and removed fifo, but ws should check if
1081          * pid should be closed */
1082         g_log(LOG_DOMAIN_CAPTURE, G_LOG_LEVEL_DEBUG,
1083               "Extcap [%s] - Closing spawned PID: %d", interface_opts->name,
1084               interface_opts->extcap_pid);
1085
1086         userdata = (extcap_userdata *) interface_opts->extcap_userdata;
1087         if (userdata)
1088         {
1089             if (userdata->extcap_stderr_rd > 0 && pipe_data_available(userdata->extcap_stderr_rd))
1090             {
1091                 buffer = (gchar *)g_malloc0(sizeof(gchar) * STDERR_BUFFER_SIZE + 1);
1092 #ifdef _WIN32
1093                 win32_readfrompipe((HANDLE)_get_osfhandle(userdata->extcap_stderr_rd), STDERR_BUFFER_SIZE, buffer);
1094 #else
1095                 if (read(userdata->extcap_stderr_rd, buffer, sizeof(gchar) * STDERR_BUFFER_SIZE) <= 0)
1096                 {
1097                     buffer[0] = '\0';
1098                 }
1099 #endif
1100                 if (strlen(buffer) > 0)
1101                 {
1102                     userdata->extcap_stderr = g_strdup_printf("%s", buffer);
1103                     userdata->exitcode = 1;
1104                 }
1105                 g_free(buffer);
1106             }
1107
1108 #ifndef _WIN32
1109             /* Final child watch may not have been called */
1110             if (interface_opts->extcap_child_watch != 0)
1111             {
1112                 extcap_child_watch_cb(userdata->pid, 0, capture_opts);
1113                 /* it will have changed in extcap_child_watch_cb */
1114                 interface_opts = &g_array_index(capture_opts->ifaces, interface_options,
1115                                                icnt);
1116             }
1117 #endif
1118
1119             if (userdata->extcap_stderr != NULL)
1120             {
1121                 overwrite_exitcode = TRUE;
1122             }
1123
1124             if (overwrite_exitcode || userdata->exitcode != 0)
1125             {
1126                 if (userdata->extcap_stderr != 0)
1127                 {
1128                     if (*errormsg == NULL)
1129                     {
1130                         *errormsg = g_strdup_printf("Error by extcap pipe: %s", userdata->extcap_stderr);
1131                     }
1132                     else
1133                     {
1134                         gchar *temp = g_strconcat(*errormsg, "\nError by extcap pipe: " , userdata->extcap_stderr, NULL);
1135                         g_free(*errormsg);
1136                         *errormsg = temp;
1137                     }
1138                     g_free(userdata->extcap_stderr);
1139                 }
1140
1141                 userdata->extcap_stderr = NULL;
1142                 userdata->exitcode = 0;
1143             }
1144         }
1145
1146         if (interface_opts->extcap_child_watch > 0)
1147         {
1148             g_source_remove(interface_opts->extcap_child_watch);
1149             interface_opts->extcap_child_watch = 0;
1150         }
1151
1152         if (interface_opts->extcap_pid != INVALID_EXTCAP_PID)
1153         {
1154 #ifdef _WIN32
1155             TerminateProcess(interface_opts->extcap_pid, 0);
1156 #endif
1157             g_spawn_close_pid(interface_opts->extcap_pid);
1158             interface_opts->extcap_pid = INVALID_EXTCAP_PID;
1159
1160             g_free(interface_opts->extcap_userdata);
1161             interface_opts->extcap_userdata = NULL;
1162         }
1163     }
1164 }
1165
1166 static gboolean
1167 extcap_add_arg_and_remove_cb(gpointer key, gpointer value, gpointer data)
1168 {
1169     GPtrArray *args = (GPtrArray *)data;
1170
1171     if (key != NULL)
1172     {
1173         g_ptr_array_add(args, g_strdup((const gchar *)key));
1174
1175         if (value != NULL)
1176         {
1177             g_ptr_array_add(args, g_strdup((const gchar *)value));
1178         }
1179
1180         return TRUE;
1181     }
1182
1183     return FALSE;
1184 }
1185
1186 void extcap_child_watch_cb(GPid pid, gint status, gpointer user_data)
1187 {
1188     guint i;
1189     interface_options *interface_opts;
1190     extcap_userdata *userdata = NULL;
1191     capture_options *capture_opts = (capture_options *)(user_data);
1192
1193     if (capture_opts == NULL || capture_opts->ifaces == NULL || capture_opts->ifaces->len == 0)
1194     {
1195         return;
1196     }
1197
1198     /* Close handle to child process. */
1199     g_spawn_close_pid(pid);
1200
1201     /* Update extcap_pid in interface options structure. */
1202     for (i = 0; i < capture_opts->ifaces->len; i++)
1203     {
1204         interface_opts = &g_array_index(capture_opts->ifaces, interface_options, i);
1205         if (interface_opts->extcap_pid == pid)
1206         {
1207             userdata = (extcap_userdata *)interface_opts->extcap_userdata;
1208             if (userdata != NULL)
1209             {
1210                 interface_opts->extcap_pid = INVALID_EXTCAP_PID;
1211                 userdata->exitcode = 0;
1212 #ifndef _WIN32
1213                 if (WIFEXITED(status))
1214                 {
1215                     if (WEXITSTATUS(status) != 0)
1216                     {
1217                         userdata->exitcode = WEXITSTATUS(status);
1218                     }
1219                 }
1220                 else
1221                 {
1222                     userdata->exitcode = G_SPAWN_ERROR_FAILED;
1223                 }
1224 #else
1225                 if (status != 0)
1226                 {
1227                     userdata->exitcode = status;
1228                 }
1229 #endif
1230                 if (status == 0 && userdata->extcap_stderr != NULL)
1231                 {
1232                     userdata->exitcode = 1;
1233                 }
1234             }
1235             g_source_remove(interface_opts->extcap_child_watch);
1236             interface_opts->extcap_child_watch = 0;
1237             break;
1238         }
1239     }
1240 }
1241
1242 static
1243 GPtrArray *extcap_prepare_arguments(interface_options *interface_opts)
1244 {
1245     GPtrArray *result = NULL;
1246
1247     if (interface_opts->if_type == IF_EXTCAP)
1248     {
1249         result = g_ptr_array_new();
1250
1251 #define add_arg(X) g_ptr_array_add(result, g_strdup(X))
1252
1253         add_arg(interface_opts->extcap);
1254         add_arg(EXTCAP_ARGUMENT_RUN_CAPTURE);
1255         add_arg(EXTCAP_ARGUMENT_INTERFACE);
1256         add_arg(interface_opts->name);
1257         if (interface_opts->cfilter && strlen(interface_opts->cfilter) > 0)
1258         {
1259             add_arg(EXTCAP_ARGUMENT_CAPTURE_FILTER);
1260             add_arg(interface_opts->cfilter);
1261         }
1262         add_arg(EXTCAP_ARGUMENT_RUN_PIPE);
1263         add_arg(interface_opts->extcap_fifo);
1264         if (interface_opts->extcap_control_in)
1265         {
1266             add_arg(EXTCAP_ARGUMENT_CONTROL_OUT);
1267             add_arg(interface_opts->extcap_control_in);
1268         }
1269         if (interface_opts->extcap_control_out)
1270         {
1271             add_arg(EXTCAP_ARGUMENT_CONTROL_IN);
1272             add_arg(interface_opts->extcap_control_out);
1273         }
1274         if (interface_opts->extcap_args == NULL || g_hash_table_size(interface_opts->extcap_args) == 0)
1275         {
1276             /* User did not perform interface configuration.
1277              *
1278              * Check if there are any boolean flags that are set by default
1279              * and hence their argument should be added.
1280              */
1281             GList *arglist;
1282             GList *elem;
1283
1284             arglist = extcap_get_if_configuration(interface_opts->name);
1285             for (elem = g_list_first(arglist); elem; elem = elem->next)
1286             {
1287                 GList *arg_list;
1288                 extcap_arg *arg_iter;
1289
1290                 if (elem->data == NULL)
1291                 {
1292                     continue;
1293                 }
1294
1295                 arg_list = g_list_first((GList *)elem->data);
1296                 while (arg_list != NULL)
1297                 {
1298                     const gchar *stored = NULL;
1299                     /* In case of boolflags only first element in arg_list is relevant. */
1300                     arg_iter = (extcap_arg *)(arg_list->data);
1301                     if (arg_iter->pref_valptr != NULL)
1302                     {
1303                         stored = *arg_iter->pref_valptr;
1304                     }
1305
1306                     if (arg_iter->arg_type == EXTCAP_ARG_BOOLFLAG)
1307                     {
1308                         if (extcap_complex_get_bool(arg_iter->default_complex))
1309                         {
1310                             add_arg(arg_iter->call);
1311                         }
1312                         else if (g_strcmp0(stored, "true") == 0)
1313                         {
1314                             add_arg(arg_iter->call);
1315                         }
1316                     }
1317                     else
1318                     {
1319                         if (stored && strlen(stored) > 0) {
1320                             add_arg(arg_iter->call);
1321                             add_arg(stored);
1322                         }
1323                     }
1324
1325                     arg_list = arg_list->next;
1326                 }
1327             }
1328
1329             extcap_free_if_configuration(arglist, TRUE);
1330         }
1331         else
1332         {
1333             g_hash_table_foreach_remove(interface_opts->extcap_args, extcap_add_arg_and_remove_cb, result);
1334         }
1335         add_arg(NULL);
1336 #undef add_arg
1337
1338     }
1339
1340     return result;
1341 }
1342
1343 /* call mkfifo for each extcap,
1344  * returns FALSE if there's an error creating a FIFO */
1345 gboolean
1346 extcap_init_interfaces(capture_options *capture_opts)
1347 {
1348     guint i;
1349     interface_options *interface_opts;
1350     extcap_userdata *userdata;
1351
1352     for (i = 0; i < capture_opts->ifaces->len; i++)
1353     {
1354         GPtrArray *args = NULL;
1355         GPid pid = INVALID_EXTCAP_PID;
1356
1357         interface_opts = &g_array_index(capture_opts->ifaces, interface_options, i);
1358
1359         /* skip native interfaces */
1360         if (interface_opts->if_type != IF_EXTCAP)
1361         {
1362             continue;
1363         }
1364
1365         /* create control pipes if having toolbar */
1366         if (extcap_has_toolbar(interface_opts->name))
1367         {
1368             extcap_create_pipe(interface_opts->name, &interface_opts->extcap_control_in,
1369                                EXTCAP_CONTROL_IN_PREFIX, FALSE);
1370 #ifdef _WIN32
1371             interface_opts->extcap_control_in_h = pipe_h;
1372 #endif
1373             extcap_create_pipe(interface_opts->name, &interface_opts->extcap_control_out,
1374                                EXTCAP_CONTROL_OUT_PREFIX, FALSE);
1375 #ifdef _WIN32
1376             interface_opts->extcap_control_out_h = pipe_h;
1377 #endif
1378         }
1379
1380         /* create pipe for fifo */
1381         if (!extcap_create_pipe(interface_opts->name, &interface_opts->extcap_fifo,
1382                                 EXTCAP_PIPE_PREFIX, TRUE))
1383         {
1384             return FALSE;
1385         }
1386 #ifdef _WIN32
1387         interface_opts->extcap_pipe_h = pipe_h;
1388 #endif
1389
1390         /* Create extcap call */
1391         args = extcap_prepare_arguments(interface_opts);
1392
1393         userdata = g_new0(extcap_userdata, 1);
1394
1395         pid = extcap_spawn_async(userdata, args);
1396
1397         g_ptr_array_foreach(args, (GFunc)g_free, NULL);
1398         g_ptr_array_free(args, TRUE);
1399
1400         if (pid == INVALID_EXTCAP_PID)
1401         {
1402             g_free(userdata);
1403             continue;
1404         }
1405
1406         interface_opts->extcap_pid = pid;
1407
1408         interface_opts->extcap_child_watch =
1409             g_child_watch_add(pid, extcap_child_watch_cb, (gpointer)capture_opts);
1410
1411 #ifdef _WIN32
1412         /* On Windows, wait for extcap to connect to named pipe.
1413          * Some extcaps will present UAC screen to user.
1414          * 30 second timeout should be reasonable timeout for extcap to
1415          * connect to named pipe (including user interaction).
1416          * Wait on multiple object in case of extcap termination
1417          * without opening pipe.
1418          *
1419          * Minimum supported version of Windows: XP / Server 2003.
1420          */
1421         if (pid != INVALID_EXTCAP_PID)
1422         {
1423             HANDLE pipe_handles[3];
1424             int num_pipe_handles = 1;
1425             pipe_handles[0] = interface_opts->extcap_pipe_h;
1426
1427             if (extcap_has_toolbar(interface_opts->name))
1428             {
1429                 pipe_handles[1] = interface_opts->extcap_control_in_h;
1430                 pipe_handles[2] = interface_opts->extcap_control_out_h;
1431                 num_pipe_handles += 2;
1432              }
1433
1434             extcap_wait_for_pipe(pipe_handles, num_pipe_handles, pid);
1435         }
1436 #endif
1437
1438         interface_opts->extcap_userdata = (gpointer) userdata;
1439     }
1440
1441     return TRUE;
1442 }
1443
1444 gboolean extcap_create_pipe(const gchar *ifname, gchar **fifo, const gchar *pipe_prefix, gboolean byte_mode _U_)
1445 {
1446 #ifdef _WIN32
1447     gchar timestr[ 14 + 1 ];
1448     time_t current_time;
1449     gchar *pipename = NULL;
1450     SECURITY_ATTRIBUTES security;
1451
1452     /* create pipename */
1453     current_time = time(NULL);
1454     /*
1455      * XXX - we trust Windows not to return a time before the Epoch here,
1456      * so we won't get a null pointer back from localtime().
1457      */
1458     strftime(timestr, sizeof(timestr), "%Y%m%d%H%M%S", localtime(&current_time));
1459     pipename = g_strconcat("\\\\.\\pipe\\", pipe_prefix, "_", ifname, "_", timestr, NULL);
1460
1461     /* Security struct to enable Inheritable HANDLE */
1462     memset(&security, 0, sizeof(SECURITY_ATTRIBUTES));
1463     security.nLength = sizeof(SECURITY_ATTRIBUTES);
1464     security.bInheritHandle = TRUE;
1465     security.lpSecurityDescriptor = NULL;
1466
1467     /* create a namedPipe */
1468     pipe_h = CreateNamedPipe(
1469                  utf_8to16(pipename),
1470                  PIPE_ACCESS_DUPLEX | FILE_FLAG_OVERLAPPED,
1471                  byte_mode ? PIPE_TYPE_BYTE : PIPE_TYPE_MESSAGE | byte_mode ? PIPE_READMODE_BYTE : PIPE_READMODE_MESSAGE | PIPE_WAIT,
1472                  1, 65536, 65536,
1473                  300,
1474                  &security);
1475
1476     if (pipe_h == INVALID_HANDLE_VALUE)
1477     {
1478         g_log(LOG_DOMAIN_CAPTURE, G_LOG_LEVEL_DEBUG, "\nError creating pipe => (%d)", GetLastError());
1479         g_free (pipename);
1480         return FALSE;
1481     }
1482     else
1483     {
1484         g_log(LOG_DOMAIN_CAPTURE, G_LOG_LEVEL_DEBUG, "\nWireshark Created pipe =>(%s)", pipename);
1485         *fifo = g_strdup(pipename);
1486     }
1487 #else
1488     gchar *temp_name = NULL;
1489     int fd = 0;
1490
1491     gchar *pfx = g_strconcat(pipe_prefix, "_", ifname, NULL);
1492     if ((fd = create_tempfile(&temp_name, pfx, NULL)) < 0)
1493     {
1494         g_free(pfx);
1495         return FALSE;
1496     }
1497     g_free(pfx);
1498
1499     ws_close(fd);
1500
1501     g_log(LOG_DOMAIN_CAPTURE, G_LOG_LEVEL_DEBUG,
1502           "Extcap - Creating fifo: %s", temp_name);
1503
1504     if (file_exists(temp_name))
1505     {
1506         ws_unlink(temp_name);
1507     }
1508
1509     if (mkfifo(temp_name, 0600) == 0)
1510     {
1511         *fifo = g_strdup(temp_name);
1512     }
1513 #endif
1514
1515     return TRUE;
1516 }
1517
1518 /************* EXTCAP LOAD INTERFACE LIST ***************
1519  *
1520  * The following code handles loading and reloading the interface list. It is explicitly
1521  * kept separate from the rest
1522  */
1523
1524
1525 static void
1526 extcap_free_interface_info(gpointer data)
1527 {
1528     extcap_info *info = (extcap_info *)data;
1529
1530     g_free(info->basename);
1531     g_free(info->full_path);
1532     g_free(info->version);
1533     g_free(info->help);
1534
1535     extcap_free_interfaces(info->interfaces);
1536
1537     g_free(info);
1538 }
1539
1540 static extcap_info *
1541 extcap_ensure_interface(const gchar * toolname, gboolean create_if_nonexist)
1542 {
1543     extcap_info * element = 0;
1544
1545     if ( ! toolname )
1546         return element;
1547
1548     if ( ! _loaded_interfaces )
1549         _loaded_interfaces = g_hash_table_new_full(g_str_hash, g_str_equal, g_free, extcap_free_interface);
1550
1551     element = (extcap_info *) g_hash_table_lookup(_loaded_interfaces, toolname );
1552     if ( ! element && create_if_nonexist )
1553     {
1554         g_hash_table_insert(_loaded_interfaces, g_strdup(toolname), g_new0(extcap_info, 1));
1555         element = (extcap_info *) g_hash_table_lookup(_loaded_interfaces, toolname );
1556     }
1557
1558     return element;
1559 }
1560
1561 extcap_info *
1562 extcap_get_tool_by_ifname(const gchar *ifname)
1563 {
1564     if ( ifname && _tool_for_ifname )
1565     {
1566         gchar * toolname = (gchar *)g_hash_table_lookup(_tool_for_ifname, ifname);
1567         if ( toolname )
1568             return extcap_ensure_interface(toolname, FALSE);
1569     }
1570
1571     return NULL;
1572 }
1573
1574 extcap_info *
1575 extcap_get_tool_info(const gchar * toolname)
1576 {
1577     return extcap_ensure_interface(toolname, FALSE);
1578 }
1579
1580 static void remove_extcap_entry(gpointer entry, gpointer data _U_)
1581 {
1582     extcap_interface *int_iter = (extcap_interface*)entry;
1583
1584     if (int_iter->if_type == EXTCAP_SENTENCE_EXTCAP)
1585         extcap_free_interface(entry);
1586 }
1587
1588 static gboolean cb_load_interfaces(extcap_callback_info_t cb_info)
1589 {
1590     GList * interfaces = NULL, * control_items = NULL, * walker = NULL;
1591     extcap_interface * int_iter = NULL;
1592     extcap_info * element = NULL;
1593     iface_toolbar * toolbar_entry = NULL;
1594     gchar * toolname = g_path_get_basename(cb_info.extcap);
1595
1596     GList * interface_keys = g_hash_table_get_keys(_loaded_interfaces);
1597
1598     /* Load interfaces from utility */
1599     interfaces = extcap_parse_interfaces(cb_info.output, &control_items);
1600
1601     if (control_items)
1602     {
1603         toolbar_entry = g_new0(iface_toolbar, 1);
1604         toolbar_entry->controls = control_items;
1605     }
1606
1607     g_log(LOG_DOMAIN_CAPTURE, G_LOG_LEVEL_DEBUG, "Loading interface list for %s ", cb_info.extcap);
1608
1609     /* Seems, that there where no interfaces to be loaded */
1610     if ( ! interfaces || g_list_length(interfaces) == 0 )
1611     {
1612         g_log(LOG_DOMAIN_CAPTURE, G_LOG_LEVEL_DEBUG, "Cannot load interfaces for %s", cb_info.extcap );
1613         /* Some utilities, androiddump for example, may actually don't present any interfaces, even
1614          * if the utility itself is present. In such a case, we return here, but do not return
1615          * FALSE, or otherwise further loading of other utilities will be stopped */
1616         g_list_free(interface_keys);
1617         g_free(toolname);
1618         return TRUE;
1619     }
1620
1621     /* Load or create the storage element for the tool */
1622     element = extcap_ensure_interface(toolname, TRUE);
1623     if ( element == NULL )
1624     {
1625         g_log(LOG_DOMAIN_CAPTURE, G_LOG_LEVEL_ERROR, "Cannot store interface %s, maybe duplicate?", cb_info.extcap );
1626         g_list_foreach(interfaces, remove_extcap_entry, NULL);
1627         g_list_free(interfaces);
1628         g_list_free(interface_keys);
1629         g_free(toolname);
1630         return FALSE;
1631     }
1632
1633     walker = interfaces;
1634     gchar* help = NULL;
1635     while (walker != NULL)
1636     {
1637         int_iter = (extcap_interface *)walker->data;
1638
1639         g_log(LOG_DOMAIN_CAPTURE, G_LOG_LEVEL_DEBUG, "Interface found %s\n", int_iter->call);
1640
1641         /* Help is not necessarily stored with the interface, but rather with the version string.
1642          * As the version string allways comes in front of the interfaces, this ensures, that it get's
1643          * properly stored with the interface */
1644         if (int_iter->if_type == EXTCAP_SENTENCE_EXTCAP)
1645         {
1646             g_log(LOG_DOMAIN_CAPTURE, G_LOG_LEVEL_DEBUG, "  Extcap [%s] ", int_iter->call);
1647             /* Only initialize values if none are set. Need to check only one element here */
1648             if ( ! element->version )
1649             {
1650                 element->version = g_strdup(int_iter->version);
1651                 element->basename = g_strdup(toolname);
1652                 element->full_path = g_strdup(cb_info.extcap);
1653                 element->help = g_strdup(int_iter->help);
1654             }
1655
1656             help = int_iter->help;
1657             if (toolbar_entry)
1658             {
1659                 toolbar_entry->menu_title = g_strdup(int_iter->display);
1660                 toolbar_entry->help = g_strdup(int_iter->help);
1661             }
1662
1663             walker = g_list_next(walker);
1664             continue;
1665         }
1666
1667         /* Only interface definitions will be parsed here. help is already set by the extcap element,
1668          * which makes it necessary to have version in the list before the interfaces. This is normally
1669          * the case by design, but could be changed by separating the information in extcap-base. */
1670         if ( int_iter->if_type == EXTCAP_SENTENCE_INTERFACE )
1671         {
1672             if ( g_list_find(interface_keys, int_iter->call) )
1673             {
1674                 g_log(LOG_DOMAIN_CAPTURE, G_LOG_LEVEL_WARNING, "Extcap interface \"%s\" is already provided by \"%s\" ",
1675                       int_iter->call, (gchar *)extcap_if_executable(int_iter->call));
1676                 walker = g_list_next(walker);
1677                 continue;
1678             }
1679
1680             g_log(LOG_DOMAIN_CAPTURE, G_LOG_LEVEL_DEBUG, "  Interface [%s] \"%s\" ",
1681                   int_iter->call, int_iter->display);
1682
1683             int_iter->extcap_path = g_strdup(cb_info.extcap);
1684
1685             /* Only set the help, if it exists and no parsed help information is present */
1686             if ( ! int_iter->help && help )
1687                 int_iter->help = g_strdup(help);
1688
1689             element->interfaces = g_list_append(element->interfaces, int_iter);
1690             g_hash_table_insert(_tool_for_ifname, g_strdup(int_iter->call), g_strdup(toolname));
1691
1692             if (toolbar_entry)
1693             {
1694                 if (!toolbar_entry->menu_title)
1695                 {
1696                     toolbar_entry->menu_title = g_strdup(int_iter->display);
1697                 }
1698                 toolbar_entry->ifnames = g_list_append(toolbar_entry->ifnames, g_strdup(int_iter->call));
1699             }
1700         }
1701
1702         walker = g_list_next(walker);
1703     }
1704
1705     if (toolbar_entry && toolbar_entry->menu_title)
1706     {
1707         iface_toolbar_add(toolbar_entry);
1708         extcap_iface_toolbar_add(cb_info.extcap, toolbar_entry);
1709     }
1710
1711     g_list_foreach(interfaces, remove_extcap_entry, NULL);
1712     g_list_free(interfaces);
1713     g_list_free(interface_keys);
1714     g_free(toolname);
1715     return TRUE;
1716 }
1717
1718
1719 /* Handles loading of the interfaces.
1720  *
1721  * A list of interfaces can be obtained by calling \ref extcap_loaded_interfaces
1722  */
1723 static void
1724 extcap_load_interface_list(void)
1725 {
1726     gchar *argv;
1727     gchar *error;
1728
1729     if (_toolbars)
1730     {
1731         // Remove existing interface toolbars here instead of in extcap_clear_interfaces()
1732         // to avoid flicker in shown toolbars when refreshing interfaces.
1733         GList *toolbar_list = g_hash_table_get_values (_toolbars);
1734         for (GList *walker = toolbar_list; walker; walker = walker->next)
1735         {
1736             iface_toolbar *toolbar = (iface_toolbar *) walker->data;
1737             iface_toolbar_remove(toolbar->menu_title);
1738         }
1739         g_hash_table_remove_all(_toolbars);
1740     } else {
1741         _toolbars = g_hash_table_new_full(g_str_hash, g_str_equal, g_free, extcap_free_toolbar);
1742     }
1743
1744     if (_loaded_interfaces == NULL)
1745     {
1746         _loaded_interfaces = g_hash_table_new_full(g_str_hash, g_str_equal, g_free, extcap_free_interface_info);
1747         /* Cleanup lookup table */
1748         if ( _tool_for_ifname )
1749         {
1750             g_hash_table_remove_all(_tool_for_ifname);
1751             _tool_for_ifname = 0;
1752         } else {
1753             _tool_for_ifname = g_hash_table_new_full(g_str_hash, g_str_equal, g_free, g_free);
1754         }
1755
1756         argv = g_strdup(EXTCAP_ARGUMENT_LIST_INTERFACES);
1757
1758         extcap_callback_info_t cb_info;
1759         cb_info.data = NULL;
1760         cb_info.ifname = NULL;
1761         cb_info.err_str = &error;
1762
1763         extcap_foreach(1, &argv, cb_load_interfaces, cb_info);
1764
1765         g_free(argv);
1766     }
1767 }
1768
1769 /*
1770  * Editor modelines  -  http://www.wireshark.org/tools/modelines.html
1771  *
1772  * Local variables:
1773  * c-basic-offset: 4
1774  * tab-width: 8
1775  * indent-tabs-mode: nil
1776  * End:
1777  *
1778  * vi: set shiftwidth=4 tabstop=8 expandtab:
1779  * :indentSize=4:tabSize=8:noTabs=true:
1780  */