3 * Routines for extcap external capture
4 * Copyright 2013, Mike Ryan <mikeryan@lacklustre.net>
6 * Wireshark - Network traffic analyzer
7 * By Gerald Combs <gerald@wireshark.org>
8 * Copyright 1998 Gerald Combs
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.
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.
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.
36 /* Include for unlink */
40 #ifdef HAVE_SYS_TYPES_H
41 #include <sys/types.h>
43 #ifdef HAVE_SYS_WAIT_H
50 #include <epan/prefs.h>
51 #include <epan/prefs-int.h>
53 #include <wsutil/file_util.h>
54 #include <wsutil/filesystem.h>
55 #include <wsutil/tempfile.h>
57 #include "capture_opts.h"
60 #include "extcap_parser.h"
61 #include "extcap_spawn.h"
64 static HANDLE pipe_h = NULL;
67 static void extcap_child_watch_cb(GPid pid, gint status, gpointer user_data);
69 /* internal container, for all the extcap interfaces that have been found.
70 * will be resetted by every call to extcap_interface_list() and is being
71 * used in extcap_get_if_* as well as extcap_init_interfaces to ensure,
72 * that only extcap interfaces are being given to underlying extcap programs
74 static GHashTable *ifaces = NULL;
76 /* internal container, for all the extcap executables that have been found.
77 * will be resetted by every call to extcap_interface_list() and is being
78 * used for printing information about all extcap interfaces found
80 static GHashTable *tools = NULL;
82 /* internal container, to map preference names to pointers that hold preference
83 * values. These ensure that preferences can survive extcap if garbage
84 * collection, and does not lead to dangling pointers in the prefs subsystem.
86 static GHashTable *extcap_prefs_dynamic_vals = NULL;
88 /* Callback definition for extcap_foreach */
89 typedef gboolean (*extcap_cb_t)(const gchar *extcap, const gchar *ifname, gchar *output, void *data,
93 extcap_if_exists(const gchar *ifname)
95 if ( !ifname || !ifaces )
98 if ( g_hash_table_lookup(ifaces, ifname) )
105 extcap_if_exists_for_extcap(const gchar *ifname, const gchar *extcap)
107 extcap_interface * entry = (extcap_interface *)g_hash_table_lookup(ifaces, ifname);
109 if ( entry && strcmp(entry->extcap_path, extcap) == 0 )
116 extcap_if_executable(const gchar *ifname)
118 extcap_interface * interface = (extcap_interface *)g_hash_table_lookup(ifaces, ifname);
119 return interface != NULL ? interface->extcap_path : NULL;
123 extcap_if_add(extcap_interface * interface)
125 if (g_hash_table_lookup(ifaces, interface->call))
128 g_hash_table_insert(ifaces, g_strdup(interface->call), interface);
133 extcap_free_info (gpointer data) {
134 extcap_info * info = (extcap_info *)data;
136 g_free (info->basename);
137 g_free (info->full_path);
138 g_free (info->version);
143 extcap_tool_add(const gchar *extcap, const extcap_interface *interface)
147 if ( !extcap || !interface )
150 toolname = g_path_get_basename(extcap);
152 if ( !g_hash_table_lookup(tools, toolname) ) {
153 extcap_info * store = (extcap_info *)g_new0(extcap_info, 1);
154 store->version = g_strdup(interface->version);
155 store->full_path = g_strdup(extcap);
156 store->basename = g_strdup(toolname);
158 g_hash_table_insert(tools, g_strdup(toolname), store);
164 /* Note: args does not need to be NULL-terminated. */
165 static void extcap_foreach(gint argc, gchar **args, extcap_cb_t cb,
166 void *cb_data, char **err_str, const char * ifname _U_) {
167 const char *dirname = get_extcap_dir();
174 if ((dir = g_dir_open(dirname, 0, NULL)) != NULL) {
175 GString *extcap_path = NULL;
177 extcap_path = g_string_new("");
178 while (keep_going && (file = g_dir_read_name(dir)) != NULL ) {
179 gchar *command_output = NULL;
181 /* full path to extcap binary */
182 g_string_printf(extcap_path, "%s" G_DIR_SEPARATOR_S "%s", dirname, file);
183 if ( extcap_if_exists(ifname) && !extcap_if_exists_for_extcap(ifname, extcap_path->str ) )
186 if ( extcap_spawn_sync ( (gchar *) dirname, extcap_path->str, argc, args, &command_output ) )
187 keep_going = cb(extcap_path->str, ifname, command_output, cb_data, err_str);
189 g_free(command_output);
193 g_string_free(extcap_path, TRUE);
198 static void extcap_free_dlt(gpointer d, gpointer user_data _U_) {
202 g_free(((extcap_dlt *)d)->name);
203 g_free(((extcap_dlt *)d)->display);
207 static void extcap_free_dlts(GList * dlts) {
208 g_list_foreach(dlts, extcap_free_dlt, NULL);
212 static gboolean dlt_cb(const gchar *extcap _U_, const gchar *ifname _U_, gchar *output, void *data,
214 GList *dlts = NULL, *temp = NULL;
216 if_capabilities_t *caps;
217 GList *linktype_list = NULL;
218 data_link_info_t *data_link_info;
219 extcap_dlt * dlt_item;
221 dlts = extcap_parse_dlts(output);
224 g_log(LOG_DOMAIN_CAPTURE, G_LOG_LEVEL_DEBUG, "Extcap pipe %s ", extcap);
227 * Allocate the interface capabilities structure.
229 caps = (if_capabilities_t *) g_malloc(sizeof *caps);
230 caps->can_set_rfmon = FALSE;
233 dlt_item = (extcap_dlt *)dlts->data;
235 g_log(LOG_DOMAIN_CAPTURE, G_LOG_LEVEL_DEBUG,
236 " DLT %d name=\"%s\" display=\"%s\" ", dlt_item->number,
237 dlt_item->name, dlt_item->display);
239 data_link_info = g_new(data_link_info_t, 1);
240 data_link_info->dlt = dlt_item->number;
241 data_link_info->name = g_strdup(dlt_item->name);
242 data_link_info->description = g_strdup(dlt_item->display);
243 linktype_list = g_list_append(linktype_list, data_link_info);
246 dlts = g_list_next(dlts);
249 /* Check to see if we built a list */
250 if (linktype_list != NULL && data != NULL) {
251 caps->data_link_types = linktype_list;
252 *(if_capabilities_t **) data = caps;
255 g_log(LOG_DOMAIN_CAPTURE, G_LOG_LEVEL_DEBUG, " returned no DLTs");
256 *err_str = g_strdup("Extcap returned no DLTs");
261 extcap_free_dlts(temp);
267 extcap_get_if_dlts(const gchar *ifname, char **err_str) {
270 if_capabilities_t *caps = NULL;
275 if ( extcap_if_exists(ifname) )
277 argv[0] = g_strdup(EXTCAP_ARGUMENT_LIST_DLTS);
278 argv[1] = g_strdup(EXTCAP_ARGUMENT_INTERFACE);
279 argv[2] = g_strdup(ifname);
281 extcap_foreach(3, argv, dlt_cb, &caps, err_str, ifname);
283 for (i = 0; i < 3; ++i)
290 static void extcap_free_interface(gpointer i) {
292 extcap_interface * interface = (extcap_interface *)i;
297 g_free(interface->call);
298 g_free(interface->display);
299 g_free(interface->version);
300 g_free(interface->help);
301 g_free(interface->extcap_path);
305 static void extcap_free_interfaces(GList * interfaces) {
306 if (interfaces == NULL)
309 g_list_foreach(interfaces, (GFunc)extcap_free_interface, NULL);
310 g_list_free(interfaces);
313 static gboolean interfaces_cb(const gchar *extcap, const gchar *ifname _U_, gchar *output, void *data,
314 char **err_str _U_) {
315 GList **il = (GList **) data;
316 GList *interfaces = NULL, *walker = NULL, *tmp = NULL;
317 extcap_interface *int_iter = NULL;
318 if_info_t *if_info = NULL;
320 interfaces = extcap_parse_interfaces(output);
322 g_log(LOG_DOMAIN_CAPTURE, G_LOG_LEVEL_DEBUG, "Extcap pipe %s ", extcap);
325 while (walker != NULL ) {
326 /* Whether the interface information needs to be preserved or not. */
327 gboolean preserve_interface = FALSE;
329 int_iter = (extcap_interface *)walker->data;
330 if ( int_iter->if_type == EXTCAP_SENTENCE_INTERFACE && extcap_if_exists(int_iter->call) )
332 g_log(LOG_DOMAIN_CAPTURE, G_LOG_LEVEL_WARNING, "Extcap interface \"%s\" is already provided by \"%s\" ",
333 int_iter->call, (gchar *)extcap_if_executable(int_iter->call) );
334 walker = g_list_next(walker);
338 if ( int_iter->if_type == EXTCAP_SENTENCE_INTERFACE )
339 g_log(LOG_DOMAIN_CAPTURE, G_LOG_LEVEL_DEBUG, " Interface [%s] \"%s\" ",
340 int_iter->call, int_iter->display);
341 else if ( int_iter->if_type == EXTCAP_SENTENCE_EXTCAP )
342 g_log(LOG_DOMAIN_CAPTURE, G_LOG_LEVEL_DEBUG, " Extcap [%s] ", int_iter->call);
344 if ( int_iter->if_type == EXTCAP_SENTENCE_INTERFACE ) {
346 if_info = g_new0(if_info_t, 1);
347 if_info->name = g_strdup(int_iter->call);
348 if_info->friendly_name = g_strdup(int_iter->display);
350 if_info->type = IF_EXTCAP;
352 if_info->extcap = g_strdup(extcap);
353 *il = g_list_append(*il, if_info);
356 int_iter->extcap_path = g_strdup(extcap);
357 preserve_interface = extcap_if_add(int_iter);
360 /* Call for interfaces and tools alike. Multiple calls (because a tool has multiple
361 * interfaces) are handled internally */
362 extcap_tool_add(extcap, int_iter);
365 walker = g_list_next(walker);
367 /* If interface was added to ifaces hash list then the hash list will free
368 * the resources. Remove the interface from interfaces list so it won't be
369 * freed when exiting this function */
370 if (preserve_interface)
371 interfaces = g_list_delete_link(interfaces, tmp);
373 extcap_free_interfaces(interfaces);
379 if_info_compare(gconstpointer a, gconstpointer b)
382 const if_info_t * if_a = (const if_info_t *)a;
383 const if_info_t * if_b = (const if_info_t *)b;
385 if ( (comp = g_strcmp0(if_a->name, if_b->name)) == 0 )
386 return g_strcmp0(if_a->friendly_name, if_b->friendly_name);
392 extcap_reload_interface_list(GList **retp, char **err_str) {
398 /* ifaces is used as cache, do not destroy its contents when
399 * returning or no extcap interfaces can be queried for options */
401 ifaces = g_hash_table_new_full(g_str_hash, g_str_equal, g_free, extcap_free_interface);
403 g_hash_table_remove_all(ifaces);
406 tools = g_hash_table_new_full(g_str_hash, g_str_equal, g_free, extcap_free_info);
408 g_hash_table_remove_all(tools);
410 argv = g_strdup(EXTCAP_ARGUMENT_LIST_INTERFACES);
412 extcap_foreach(1, &argv, interfaces_cb, retp, err_str, NULL);
418 extcap_get_help_for_ifname(const char *ifname)
420 extcap_interface * interface = (extcap_interface *)g_hash_table_lookup(ifaces, ifname);
421 return interface != NULL ? interface->help : NULL;
425 extcap_tools_list(void) {
426 if ( tools == NULL || g_hash_table_size(tools) == 0 )
427 extcap_reload_interface_list(NULL, NULL);
433 append_extcap_interface_list(GList *list, char **err_str) {
438 /* Update the extcap interfaces and get a list of their if_infos */
439 extcap_reload_interface_list(&ret, err_str);
442 ret = g_list_sort(ret, if_info_compare);
444 /* Append the interfaces in that list to the list we're handed. */
445 while (ret != NULL) {
446 entry = g_list_first(ret);
448 ret = g_list_delete_link(ret, entry);
449 list = g_list_append(list, data);
455 extcap_register_preferences_callback(gpointer key, gpointer value _U_, gpointer user_data _U_)
459 arguments = extcap_get_if_configuration((gchar *)key);
460 /* Memory for prefs are external to an interface, they are part of
461 * extcap core, so the parsed arguments can be freed. */
462 extcap_free_if_configuration(arguments, TRUE);
465 void extcap_register_preferences(void)
467 module_t * dev_module = prefs_find_module("extcap");
472 if ( ! ifaces || g_hash_table_size(ifaces) == 0 )
473 extcap_reload_interface_list(NULL, NULL);
475 g_hash_table_foreach(ifaces, extcap_register_preferences_callback, NULL);
479 * Releases the dynamic preference value pointers. Must not be called before
480 * prefs_cleanup since these pointers could still be in use.
482 void extcap_cleanup(void)
484 if (extcap_prefs_dynamic_vals) {
485 g_hash_table_destroy(extcap_prefs_dynamic_vals);
489 void extcap_pref_store(extcap_arg * arg, const char * newval)
491 if (arg && arg->pref_valptr != NULL)
493 g_free(*arg->pref_valptr);
494 *arg->pref_valptr = g_strdup(newval);
500 * Obtains a pointer which can store a value for the given preference name.
501 * The preference name that can be passed to the prefs API is stored into
504 * Extcap interfaces (and their preferences) are dynamic, they can be created
505 * and destroyed at will. Thus their data structures are insufficient to pass to
506 * the preferences APIs which require pointers which are valid until the
507 * preferences are removed (at exit).
509 static gchar ** extcap_prefs_dynamic_valptr(const char *name, char **pref_name)
512 if (!extcap_prefs_dynamic_vals) {
513 /* Initialize table only as needed, most preferences are not dynamic */
514 extcap_prefs_dynamic_vals = g_hash_table_new_full(g_str_hash, g_str_equal,
517 if (!g_hash_table_lookup_extended(extcap_prefs_dynamic_vals, name,
518 (gpointer *)pref_name, (gpointer *)&valp)) {
519 /* New dynamic pref, allocate, initialize and store. */
520 valp = g_new0(gchar *, 1);
521 *pref_name = g_strdup(name);
522 g_hash_table_insert(extcap_prefs_dynamic_vals, *pref_name, valp);
527 void extcap_free_if_configuration(GList *list, gboolean free_args)
531 for (elem = g_list_first(list); elem; elem = elem->next)
533 if (elem->data != NULL) {
534 sl = g_list_first((GList *)elem->data);
536 extcap_free_arg_list(sl);
545 extcap_pref_for_argument(const gchar *ifname, struct _extcap_arg * arg) {
546 struct preference * pref = NULL;
548 GRegex * regex_name = g_regex_new ("[-]+", (GRegexCompileFlags) 0, (GRegexMatchFlags) 0, NULL );
549 GRegex * regex_ifname = g_regex_new ("(?![a-zA-Z1-9_]).", (GRegexCompileFlags) 0, (GRegexMatchFlags) 0, NULL );
550 if (regex_name && regex_ifname) {
551 if ( prefs_find_module("extcap") ) {
552 gchar * pref_name = g_regex_replace(regex_name, arg->call, strlen(arg->call), 0, "", (GRegexMatchFlags) 0, NULL );
553 gchar * ifname_underscore = g_regex_replace(regex_ifname, ifname, strlen(ifname), 0, "_", (GRegexMatchFlags) 0, NULL );
554 gchar * ifname_lowercase = g_ascii_strdown(ifname_underscore, -1);
555 gchar * pref_ifname = g_strconcat(ifname_lowercase, ".", pref_name, NULL);
557 pref = prefs_find_preference(prefs_find_module("extcap"), pref_ifname);
560 g_free(ifname_underscore);
561 g_free(ifname_lowercase);
566 g_regex_unref(regex_name);
569 g_regex_unref(regex_ifname);
575 static gboolean search_cb(const gchar *extcap _U_, const gchar *ifname _U_, gchar *output, void *data,
576 char **err_str _U_) {
577 GList *arguments = NULL;
578 GList **il = (GList **) data;
579 module_t * dev_module = NULL;
581 arguments = extcap_parse_args(output);
583 dev_module = prefs_find_module("extcap");
586 GList * walker = arguments;
588 GRegex * regex_name = g_regex_new ("[-]+", (GRegexCompileFlags) 0, (GRegexMatchFlags) 0, NULL );
589 GRegex * regex_ifname = g_regex_new ("(?![a-zA-Z1-9_]).", (GRegexCompileFlags) 0, (GRegexMatchFlags) 0, NULL );
590 if (regex_name && regex_ifname) {
591 while ( walker != NULL ) {
592 extcap_arg * arg = (extcap_arg *)walker->data;
593 arg->device_name = g_strdup(ifname);
596 struct preference * pref = NULL;
598 gchar * pref_name = g_regex_replace(regex_name, arg->call, strlen(arg->call), 0, "", (GRegexMatchFlags) 0, NULL );
599 gchar * ifname_underscore = g_regex_replace(regex_ifname, ifname, strlen(ifname), 0, "_", (GRegexMatchFlags) 0, NULL );
600 gchar * ifname_lowercase = g_ascii_strdown(ifname_underscore, -1);
601 gchar * pref_ifname = g_strconcat(ifname_lowercase, ".", pref_name, NULL);
603 if ( ( pref = prefs_find_preference(dev_module, pref_ifname) ) == NULL ) {
604 char *pref_name_for_prefs;
605 char *pref_title = wmem_strdup(wmem_epan_scope(), arg->display);
607 arg->pref_valptr = extcap_prefs_dynamic_valptr(pref_ifname, &pref_name_for_prefs);
608 /* Set an initial value if any (the string will be copied at registration) */
609 if (arg->default_complex) {
610 *arg->pref_valptr = arg->default_complex->_val;
613 prefs_register_string_preference(dev_module, pref_name_for_prefs,
614 pref_title, pref_title, (const char **)arg->pref_valptr);
616 /* Been here before, restore stored value */
617 if (! arg->pref_valptr && pref->varp.string && strlen(*pref->varp.string))
619 arg->pref_valptr = pref->varp.string;
624 g_free(ifname_underscore);
625 g_free(ifname_lowercase);
629 walker = g_list_next(walker);
633 g_regex_unref(regex_name);
636 g_regex_unref(regex_ifname);
640 *il = g_list_append(*il, arguments);
642 /* By returning false, extcap_foreach will break on first found */
647 extcap_get_if_configuration(const char * ifname) {
650 gchar **err_str = NULL;
653 if ( extcap_if_exists(ifname) )
655 g_log(LOG_DOMAIN_CAPTURE, G_LOG_LEVEL_DEBUG, "Extcap path %s",
658 argv[0] = g_strdup(EXTCAP_ARGUMENT_CONFIG);
659 argv[1] = g_strdup(EXTCAP_ARGUMENT_INTERFACE);
660 argv[2] = g_strdup(ifname);
662 extcap_foreach(3, argv, search_cb, &ret, err_str, ifname);
664 for (i = 0; i < 3; i++)
672 * If is_required is FALSE: returns TRUE if the extcap interface has
673 * configurable options.
674 * If is_required is TRUE: returns TRUE when the extcap interface has
675 * configurable options that required modification. (For example, when an
676 * argument is required but empty.)
679 extcap_has_configuration(const char * ifname, gboolean is_required) {
680 GList * arguments = 0;
681 GList * walker = 0, * item = 0;
683 gboolean found = FALSE;
685 arguments = extcap_get_if_configuration((const char *)( ifname ) );
686 walker = g_list_first(arguments);
688 while ( walker != NULL && ! found ) {
689 item = g_list_first((GList *)(walker->data));
690 while ( item != NULL && ! found ) {
691 if ( (extcap_arg *)(item->data) != NULL ) {
692 extcap_arg * arg = (extcap_arg *)(item->data);
693 /* Should required options be present, or any kind of options */
696 else if ( arg->is_required ) {
697 const gchar * stored = NULL;
698 const gchar * defval = NULL;
700 if (arg->pref_valptr != NULL)
701 stored = *arg->pref_valptr;
703 if ( arg->default_complex != NULL && arg->default_complex->_val != NULL )
704 defval = arg->default_complex->_val;
706 if ( arg->is_required ) {
707 /* If stored and defval is identical and the argument is required,
708 * configuration is needed */
709 if ( defval && stored && g_strcmp0(stored, defval) == 0 )
711 else if ( ! defval && (!stored || !*stored) )
715 if ( arg->arg_type == EXTCAP_ARG_FILESELECT ) {
716 if ( arg->fileexists && ! ( file_exists(defval) || file_exists(stored) ) )
724 walker = walker->next;
726 extcap_free_if_configuration(arguments, TRUE);
731 /* taken from capchild/capture_sync.c */
732 static gboolean pipe_data_available(int pipe_fd) {
733 #ifdef _WIN32 /* PeekNamedPipe */
734 HANDLE hPipe = (HANDLE) _get_osfhandle(pipe_fd);
737 if (hPipe == INVALID_HANDLE_VALUE)
740 if (! PeekNamedPipe(hPipe, NULL, 0, NULL, &bytes_avail, NULL))
748 struct timeval timeout;
751 FD_SET(pipe_fd, &rfds);
755 if (select(pipe_fd+1, &rfds, NULL, NULL, &timeout) > 0)
762 void extcap_if_cleanup(capture_options * capture_opts, gchar ** errormsg) {
763 interface_options interface_opts;
764 extcap_userdata * userdata;
766 gboolean overwrite_exitcode;
768 #define STDERR_BUFFER_SIZE 1024
770 for (icnt = 0; icnt < capture_opts->ifaces->len; icnt++) {
771 interface_opts = g_array_index(capture_opts->ifaces, interface_options,
774 /* skip native interfaces */
775 if (interface_opts.if_type != IF_EXTCAP)
778 overwrite_exitcode = FALSE;
780 g_log(LOG_DOMAIN_CAPTURE, G_LOG_LEVEL_DEBUG,
781 "Extcap [%s] - Cleaning up fifo: %s; PID: %d", interface_opts.name,
782 interface_opts.extcap_fifo, interface_opts.extcap_pid);
786 g_log(LOG_DOMAIN_CAPTURE, G_LOG_LEVEL_DEBUG,
787 "Extcap [%s] - Closing pipe", interface_opts.name);
788 FlushFileBuffers(pipe_h);
789 DisconnectNamedPipe(pipe_h);
793 if (interface_opts.extcap_fifo != NULL && file_exists(interface_opts.extcap_fifo))
795 /* the fifo will not be freed here, but with the other capture_opts in capture_sync */
796 ws_unlink(interface_opts.extcap_fifo);
797 interface_opts.extcap_fifo = NULL;
800 /* Maybe the client closed and removed fifo, but ws should check if
801 * pid should be closed */
802 g_log(LOG_DOMAIN_CAPTURE, G_LOG_LEVEL_DEBUG,
803 "Extcap [%s] - Closing spawned PID: %d", interface_opts.name,
804 interface_opts.extcap_pid);
806 userdata = (extcap_userdata *) interface_opts.extcap_userdata;
809 if (userdata->extcap_stderr_rd > 0 && pipe_data_available(userdata->extcap_stderr_rd) )
811 buffer = (gchar * )g_malloc0(sizeof(gchar) * STDERR_BUFFER_SIZE + 1);
813 win32_readfrompipe((HANDLE)_get_osfhandle(userdata->extcap_stderr_rd), STDERR_BUFFER_SIZE, buffer);
815 if (read(userdata->extcap_stderr_rd, buffer, sizeof(gchar) * STDERR_BUFFER_SIZE) <= 0 )
818 if ( strlen ( buffer) > 0 )
820 userdata->extcap_stderr = g_strdup_printf("%s", buffer);
821 userdata->exitcode = 1;
827 /* Final child watch may not have been called */
828 if ( interface_opts.extcap_child_watch != 0 )
830 extcap_child_watch_cb(userdata->pid, 0, capture_opts);
831 /* it will have changed in extcap_child_watch_cb */
832 interface_opts = g_array_index(capture_opts->ifaces, interface_options,
837 if ( userdata->extcap_stderr != NULL )
838 overwrite_exitcode = TRUE;
840 if ( overwrite_exitcode || userdata->exitcode != 0 )
842 if ( userdata->extcap_stderr != 0 )
844 if ( *errormsg == NULL )
845 *errormsg = g_strdup_printf("Error by extcap pipe: %s", userdata->extcap_stderr);
848 gchar * temp = g_strconcat ( *errormsg, "\nError by extcap pipe: " ,userdata->extcap_stderr, NULL );
852 g_free (userdata->extcap_stderr );
855 userdata->extcap_stderr = NULL;
856 userdata->exitcode = 0;
860 if (interface_opts.extcap_child_watch > 0)
862 g_source_remove(interface_opts.extcap_child_watch);
863 interface_opts.extcap_child_watch = 0;
866 if (interface_opts.extcap_pid != INVALID_EXTCAP_PID)
869 TerminateProcess(interface_opts.extcap_pid, 0);
871 g_spawn_close_pid(interface_opts.extcap_pid);
872 interface_opts.extcap_pid = INVALID_EXTCAP_PID;
874 g_free(interface_opts.extcap_userdata);
875 interface_opts.extcap_userdata = NULL;
878 /* Make sure modified interface_opts is saved in capture_opts. */
879 capture_opts->ifaces = g_array_remove_index(capture_opts->ifaces, icnt);
880 g_array_insert_val(capture_opts->ifaces, icnt, interface_opts);
885 extcap_add_arg_and_remove_cb(gpointer key, gpointer value, gpointer data) {
886 GPtrArray *args = (GPtrArray *)data;
890 g_ptr_array_add(args, g_strdup((const gchar*)key));
893 g_ptr_array_add(args, g_strdup((const gchar*)value));
901 void extcap_child_watch_cb(GPid pid, gint status, gpointer user_data)
904 interface_options interface_opts;
905 extcap_userdata * userdata = NULL;
906 capture_options * capture_opts = (capture_options *)(user_data);
908 if ( capture_opts == NULL || capture_opts->ifaces == NULL || capture_opts->ifaces->len == 0 )
911 /* Close handle to child process. */
912 g_spawn_close_pid(pid);
914 /* Update extcap_pid in interface options structure. */
915 for (i = 0; i < capture_opts->ifaces->len; i++)
917 interface_opts = g_array_index(capture_opts->ifaces, interface_options, i);
918 if (interface_opts.extcap_pid == pid)
920 userdata = (extcap_userdata *)interface_opts.extcap_userdata;
921 if ( userdata != NULL )
923 interface_opts.extcap_pid = INVALID_EXTCAP_PID;
924 userdata->exitcode = 0;
926 if ( WIFEXITED(status) )
928 if ( WEXITSTATUS(status) != 0 )
929 userdata->exitcode = WEXITSTATUS(status);
932 userdata->exitcode = G_SPAWN_ERROR_FAILED;
935 userdata->exitcode = status;
937 if ( status == 0 && userdata->extcap_stderr != NULL )
938 userdata->exitcode = 1;
940 g_source_remove(interface_opts.extcap_child_watch);
941 interface_opts.extcap_child_watch = 0;
943 capture_opts->ifaces = g_array_remove_index(capture_opts->ifaces, i);
944 g_array_insert_val(capture_opts->ifaces, i, interface_opts);
951 GPtrArray * extcap_prepare_arguments(interface_options interface_opts)
953 GPtrArray *result = NULL;
955 if (interface_opts.if_type == IF_EXTCAP )
957 result = g_ptr_array_new();
959 #define add_arg(X) g_ptr_array_add(result, g_strdup(X))
961 add_arg(interface_opts.extcap);
962 add_arg(EXTCAP_ARGUMENT_RUN_CAPTURE);
963 add_arg(EXTCAP_ARGUMENT_INTERFACE);
964 add_arg(interface_opts.name);
965 if (interface_opts.cfilter && strlen(interface_opts.cfilter) > 0) {
966 add_arg(EXTCAP_ARGUMENT_CAPTURE_FILTER);
967 add_arg(interface_opts.cfilter);
969 add_arg(EXTCAP_ARGUMENT_RUN_PIPE);
970 add_arg(interface_opts.extcap_fifo);
971 if (interface_opts.extcap_args == NULL || g_hash_table_size(interface_opts.extcap_args) == 0)
973 /* User did not perform interface configuration.
975 * Check if there are any boolean flags that are set by default
976 * and hence their argument should be added.
981 arglist = extcap_get_if_configuration(interface_opts.name);
982 for (elem = g_list_first(arglist); elem; elem = elem->next)
985 extcap_arg *arg_iter;
987 if (elem->data == NULL)
992 arg_list = g_list_first((GList *)elem->data);
993 while (arg_list != NULL) {
994 const gchar * stored = NULL, * defval = NULL;
995 /* In case of boolflags only first element in arg_list is relevant. */
996 arg_iter = (extcap_arg*) (arg_list->data);
997 if (arg_iter->pref_valptr != NULL)
998 stored = *arg_iter->pref_valptr;
1000 if ( arg_iter->default_complex != NULL && arg_iter->default_complex->_val != NULL )
1001 defval = arg_iter->default_complex->_val;
1003 /* Different data in storage then set for default */
1004 if ( g_strcmp0(stored, defval) != 0 ) {
1005 if ( arg_iter->arg_type == EXTCAP_ARG_BOOLFLAG ) {
1006 if ( g_strcmp0(stored, "true") == 0 )
1007 add_arg(arg_iter->call);
1009 add_arg(arg_iter->call);
1012 } else if (arg_iter->arg_type == EXTCAP_ARG_BOOLFLAG) {
1013 if (extcap_complex_get_bool(arg_iter->default_complex))
1014 add_arg(arg_iter->call);
1017 arg_list = arg_list->next;
1021 extcap_free_if_configuration(arglist, TRUE);
1025 g_hash_table_foreach_remove(interface_opts.extcap_args, extcap_add_arg_and_remove_cb, result);
1035 /* call mkfifo for each extcap,
1036 * returns FALSE if there's an error creating a FIFO */
1038 extcap_init_interfaces(capture_options *capture_opts)
1041 interface_options interface_opts;
1042 extcap_userdata * userdata;
1044 for (i = 0; i < capture_opts->ifaces->len; i++)
1046 GPtrArray *args = NULL;
1047 GPid pid = INVALID_EXTCAP_PID;
1049 interface_opts = g_array_index(capture_opts->ifaces, interface_options, i);
1051 /* skip native interfaces */
1052 if (interface_opts.if_type != IF_EXTCAP )
1055 /* create pipe for fifo */
1056 if ( ! extcap_create_pipe ( &interface_opts.extcap_fifo ) )
1059 /* Create extcap call */
1060 args = extcap_prepare_arguments(interface_opts);
1062 userdata = g_new0(extcap_userdata, 1);
1064 pid = extcap_spawn_async(userdata, args );
1066 g_ptr_array_foreach(args, (GFunc)g_free, NULL);
1067 g_ptr_array_free(args, TRUE);
1069 if ( pid == INVALID_EXTCAP_PID )
1075 interface_opts.extcap_pid = pid;
1077 interface_opts.extcap_child_watch =
1078 g_child_watch_add(pid, extcap_child_watch_cb, (gpointer)capture_opts);
1081 /* On Windows, wait for extcap to connect to named pipe.
1082 * Some extcaps will present UAC screen to user.
1083 * 30 second timeout should be reasonable timeout for extcap to
1084 * connect to named pipe (including user interaction).
1085 * Wait on multiple object in case of extcap termination
1086 * without opening pipe.
1088 * Minimum supported version of Windows: XP / Server 2003.
1090 if (pid != INVALID_EXTCAP_PID)
1092 extcap_wait_for_pipe(pipe_h, pid);
1097 interface_opts.extcap_userdata = (gpointer) userdata;
1099 capture_opts->ifaces = g_array_remove_index(capture_opts->ifaces, i);
1100 g_array_insert_val(capture_opts->ifaces, i, interface_opts);
1107 /* called by capture_sync to get the CreatNamedPipe handle*/
1109 extcap_get_win32_handle()
1115 gboolean extcap_create_pipe(char ** fifo)
1118 gchar timestr[ 14+1 ];
1119 time_t current_time;
1121 gchar *pipename = NULL;
1123 SECURITY_ATTRIBUTES security;
1124 /* create pipename */
1125 current_time = time(NULL);
1127 * XXX - we trust Windows not to return a time before the Epoch here,
1128 * so we won't get a null pointer back from localtime().
1130 strftime(timestr, sizeof(timestr), "%Y%m%d%H%M%S", localtime(¤t_time));
1131 pipename = g_strconcat ( "\\\\.\\pipe\\", EXTCAP_PIPE_PREFIX, "_", timestr, NULL );
1133 /* Security struct to enable Inheritable HANDLE */
1134 memset(&security, 0, sizeof(SECURITY_ATTRIBUTES));
1135 security.nLength = sizeof(SECURITY_ATTRIBUTES);
1136 security.bInheritHandle = TRUE;
1137 security.lpSecurityDescriptor = NULL;
1139 /* create a namedPipe*/
1140 pipe_h = CreateNamedPipe(
1141 utf_8to16(pipename),
1142 PIPE_ACCESS_DUPLEX | FILE_FLAG_OVERLAPPED,
1143 PIPE_TYPE_MESSAGE| PIPE_READMODE_MESSAGE | PIPE_WAIT,
1148 if (pipe_h == INVALID_HANDLE_VALUE)
1150 g_log(LOG_DOMAIN_CAPTURE, G_LOG_LEVEL_DEBUG,"\nError creating pipe => (%d)", GetLastError());
1155 g_log(LOG_DOMAIN_CAPTURE, G_LOG_LEVEL_DEBUG,"\nWireshark Created pipe =>(%s)",pipename);
1156 *fifo = g_strdup(pipename);
1159 gchar *temp_name = NULL;
1162 if ((fd = create_tempfile(&temp_name, EXTCAP_PIPE_PREFIX, NULL)) < 0 )
1167 g_log(LOG_DOMAIN_CAPTURE, G_LOG_LEVEL_DEBUG,
1168 "Extcap - Creating fifo: %s", temp_name);
1170 if ( file_exists(temp_name) )
1171 ws_unlink(temp_name);
1173 if (mkfifo(temp_name, 0600) == 0)
1174 *fifo = g_strdup(temp_name);
1181 * Editor modelines - http://www.wireshark.org/tools/modelines.html
1186 * indent-tabs-mode: nil
1189 * vi: set shiftwidth=4 tabstop=8 expandtab:
1190 * :indentSize=4:tabSize=8:noTabs=true: