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extcap.c
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extcap.c
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/* extcap.c
*
* Routines for extcap external capture
* Copyright 2013, Mike Ryan <[email protected]>
*
* Wireshark - Network traffic analyzer
* By Gerald Combs <[email protected]>
* Copyright 1998 Gerald Combs
*
* SPDX-License-Identifier: GPL-2.0-or-later
*/
#include <config.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#ifdef _WIN32
#include <windows.h>
#include <process.h>
#include <time.h>
#else
/* Include for unlink */
#include <unistd.h>
#endif
#include <sys/types.h>
#ifdef HAVE_SYS_WAIT_H
#include <sys/wait.h>
#endif
#include <glib.h>
#include <log.h>
#include <epan/prefs.h>
#include "ui/iface_toolbar.h"
#include <wsutil/file_util.h>
#include <wsutil/filesystem.h>
#include <wsutil/ws_pipe.h>
#include <wsutil/ws_printf.h>
#include <wsutil/tempfile.h>
#include "capture_opts.h"
#include "extcap.h"
#include "extcap_parser.h"
#include "version_info.h"
#ifdef _WIN32
static HANDLE pipe_h = INVALID_HANDLE_VALUE;
#endif
static void extcap_child_watch_cb(GPid pid, gint status, gpointer user_data);
/* internal container, for all the extcap executables that have been found.
* Will be resetted if extcap_clear_interfaces() is being explicitly called
* and is being used for printing information about all extcap interfaces found,
* as well as storing all sub-interfaces
*/
static GHashTable * _loaded_interfaces = NULL;
/* Internal container, which maps each ifname to the tool providing it, for faster
* lookup. The key and string value are owned by this table.
*/
static GHashTable * _tool_for_ifname = NULL;
/* internal container, for all the extcap executables that have been found
* and that provides a toolbar with controls to be added to a Interface Toolbar
*/
static GHashTable *_toolbars = NULL;
/* internal container, to map preference names to pointers that hold preference
* values. These ensure that preferences can survive extcap if garbage
* collection, and does not lead to dangling pointers in the prefs subsystem.
*/
static GHashTable *extcap_prefs_dynamic_vals = NULL;
typedef struct _extcap_callback_info_t
{
const gchar * extcap;
const gchar * ifname;
gchar * output;
void * data;
gchar ** err_str;
} extcap_callback_info_t;
/* Callback definition for extcap_foreach */
typedef gboolean(*extcap_cb_t)(extcap_callback_info_t info_structure);
/** GThreadPool does not support pushing new work from a thread while waiting
* for the thread pool to finish. This data structure tracks ongoing work.
* See https://gitlab.gnome.org/GNOME/glib/issues/1598 */
typedef struct thread_pool {
GThreadPool *pool;
gint count; /**< Number of tasks that have not finished. */
GCond cond;
GMutex data_mutex;
} thread_pool_t;
/**
* Callback definition for extcap_run_all, invoked with a thread pool (to
* schedule new tasks), an opaque data parameter, and the output from last task
* (or NULL if it failed). The output must be freed by the callback function.
* The implementation MUST be thread-safe.
*/
typedef void (*extcap_run_cb_t)(thread_pool_t *pool, void *data, char *output);
typedef struct extcap_run_task {
const char *extcap_path;
char **argv; /**< NULL-terminated arguments list, freed when the task is completed. */
extcap_run_cb_t output_cb;
void *data; /** Parameter to be passed to output_cb. */
} extcap_run_task_t;
typedef struct extcap_iface_info {
char *ifname; /**< Interface name. */
char *output; /**< Output of --extcap-config. */
} extcap_iface_info_t;
typedef struct extcap_run_extcaps_info {
char *extcap_path; /**< Extcap program path, MUST be the first member. */
char *output; /**< Output of --extcap-interfaces. */
guint num_interfaces; /**< Number of discovered interfaces. */
extcap_iface_info_t *iface_infos; /**< Per-interface information. */
} extcap_run_extcaps_info_t;
static void extcap_load_interface_list(void);
static gboolean
thread_pool_push(thread_pool_t *pool, gpointer data, GError **error)
{
g_mutex_lock(&pool->data_mutex);
++pool->count;
g_mutex_unlock(&pool->data_mutex);
return g_thread_pool_push(pool->pool, data, error);
}
static void
thread_pool_wait(thread_pool_t *pool)
{
g_mutex_lock(&pool->data_mutex);
while (pool->count != 0) {
g_cond_wait(&pool->cond, &pool->data_mutex);
}
g_mutex_unlock(&pool->data_mutex);
}
static GHashTable *
extcap_loaded_interfaces(void)
{
if (prefs.capture_no_extcap)
return NULL;
if ( !_loaded_interfaces || g_hash_table_size(_loaded_interfaces) == 0 )
extcap_load_interface_list();
return _loaded_interfaces;
}
void
extcap_clear_interfaces(void)
{
if ( _loaded_interfaces )
g_hash_table_destroy(_loaded_interfaces);
_loaded_interfaces = NULL;
if ( _tool_for_ifname )
g_hash_table_destroy(_tool_for_ifname);
_tool_for_ifname = NULL;
}
static gint
compare_tools(gconstpointer a, gconstpointer b)
{
return g_strcmp0((*(extcap_info *const *)a)->basename, (*(extcap_info *const *)b)->basename);
}
void
extcap_get_descriptions(plugin_description_callback callback, void *callback_data)
{
GHashTable * tools = extcap_loaded_interfaces();
GPtrArray *tools_array = g_ptr_array_new();
if (tools && g_hash_table_size(tools) > 0) {
GList * keys = g_hash_table_get_keys(tools);
GList * walker = g_list_first(keys);
while (walker && walker->data) {
extcap_info * tool = (extcap_info *)g_hash_table_lookup(tools, walker->data);
if (tool) {
g_ptr_array_add(tools_array, tool);
}
walker = g_list_next(walker);
}
g_list_free(keys);
}
g_ptr_array_sort(tools_array, compare_tools);
for (guint i = 0; i < tools_array->len; i++) {
extcap_info *tool = (extcap_info *)tools_array->pdata[i];
callback(tool->basename, tool->version, "extcap", tool->full_path, callback_data);
}
g_ptr_array_free(tools_array, TRUE);
}
static void
print_extcap_description(const char *basename, const char *version,
const char *description, const char *filename,
void *user_data _U_)
{
ws_debug_printf("%-16s\t%s\t%s\t%s\n", basename, version, description, filename);
}
void
extcap_dump_all(void)
{
extcap_get_descriptions(print_extcap_description, NULL);
}
/**
* Obtains a list of extcap program paths. Use g_slist_free_full(paths, g_free)
* to destroy the list.
*/
static GSList *
extcap_get_extcap_paths(void)
{
GDir *dir;
const char *dirname = get_extcap_dir();
const gchar *file;
GSList *paths = NULL;
if ((dir = g_dir_open(dirname, 0, NULL)) != NULL) {
while ((file = g_dir_read_name(dir)) != NULL) {
/* full path to extcap binary */
gchar *extcap_path = g_strdup_printf("%s" G_DIR_SEPARATOR_S "%s", dirname, file);
/* treat anything executable as an extcap binary */
if (g_file_test(extcap_path, G_FILE_TEST_IS_REGULAR) &&
g_file_test(extcap_path, G_FILE_TEST_IS_EXECUTABLE)) {
paths = g_slist_append(paths, extcap_path);
} else {
g_free(extcap_path);
}
}
g_dir_close(dir);
}
return paths;
}
static extcap_interface *
extcap_find_interface_for_ifname(const gchar *ifname)
{
extcap_interface * result = NULL;
if ( !ifname || ! _tool_for_ifname || ! _loaded_interfaces )
return result;
gchar * extcap_util = (gchar *)g_hash_table_lookup(_tool_for_ifname, ifname);
if ( ! extcap_util )
return result;
extcap_info * element = (extcap_info *)g_hash_table_lookup(_loaded_interfaces, extcap_util);
if ( ! element )
return result;
GList * walker = element->interfaces;
while ( walker && walker->data && ! result )
{
extcap_interface * interface = (extcap_interface *)walker->data;
if ( g_strcmp0(interface->call, ifname) == 0 )
{
result = interface;
break;
}
walker = g_list_next ( walker );
}
return result;
}
static void
extcap_free_toolbar(gpointer data)
{
if (!data)
{
return;
}
iface_toolbar *toolbar = (iface_toolbar *)data;
g_free(toolbar->menu_title);
g_free(toolbar->help);
g_list_free_full(toolbar->ifnames, g_free);
g_list_free_full(toolbar->controls, (GDestroyNotify)extcap_free_toolbar_control);
g_free(toolbar);
}
static gchar *
extcap_if_executable(const gchar *ifname)
{
extcap_interface *interface = extcap_find_interface_for_ifname(ifname);
return interface != NULL ? interface->extcap_path : NULL;
}
static void
extcap_iface_toolbar_add(const gchar *extcap, iface_toolbar *toolbar_entry)
{
char *toolname;
if (!extcap || !toolbar_entry)
{
return;
}
toolname = g_path_get_basename(extcap);
if (!g_hash_table_lookup(_toolbars, toolname))
{
g_hash_table_insert(_toolbars, g_strdup(toolname), toolbar_entry);
}
g_free(toolname);
}
static gchar **
extcap_convert_arguments_to_array(GList * arguments)
{
gchar ** result = NULL;
if ( arguments )
{
GList * walker = g_list_first(arguments);
int cnt = 0;
result = (gchar **) g_malloc0(sizeof(gchar *) * (g_list_length(arguments)));
while(walker)
{
result[cnt] = g_strdup((const gchar *)walker->data);
walker = g_list_next(walker);
cnt++;
}
}
return result;
}
static void extcap_free_array(gchar ** args, int argc)
{
int cnt = 0;
for ( cnt = 0; cnt < argc; cnt++ )
g_free(args[cnt]);
g_free(args);
}
static void
extcap_free_extcaps_info_array(extcap_run_extcaps_info_t *infos, guint count)
{
for (guint i = 0; i < count; i++) {
g_free(infos[i].extcap_path);
g_free(infos[i].output);
for (guint j = 0; j < infos[i].num_interfaces; j++) {
extcap_iface_info_t *iface_info = &infos[i].iface_infos[j];
g_free(iface_info->ifname);
g_free(iface_info->output);
}
g_free(infos[i].iface_infos);
}
g_free(infos);
}
static void
extcap_run_one(const extcap_interface *interface, GList *arguments, extcap_cb_t cb, void *user_data, char **err_str)
{
const char *dirname = get_extcap_dir();
gchar **args = extcap_convert_arguments_to_array(arguments);
int cnt = g_list_length(arguments);
gchar *command_output;
if (ws_pipe_spawn_sync(dirname, interface->extcap_path, cnt, args, &command_output)) {
extcap_callback_info_t cb_info = {
.ifname = interface->call,
.extcap = interface->extcap_path,
.output = command_output,
.data = user_data,
.err_str = err_str,
};
cb(cb_info);
g_free(command_output);
}
extcap_free_array(args, cnt);
}
/** Thread callback to run an extcap program and pass its output. */
static void
extcap_thread_callback(gpointer data, gpointer user_data)
{
extcap_run_task_t *task = (extcap_run_task_t *)data;
thread_pool_t *pool = (thread_pool_t *)user_data;
const char *dirname = get_extcap_dir();
char *command_output;
if (ws_pipe_spawn_sync(dirname, task->extcap_path, g_strv_length(task->argv), task->argv, &command_output)) {
task->output_cb(pool, task->data, command_output);
} else {
task->output_cb(pool, task->data, NULL);
}
g_strfreev(task->argv);
g_free(task);
// Notify when all tasks are completed and no new subtasks were created.
g_mutex_lock(&pool->data_mutex);
if (--pool->count == 0) {
g_cond_signal(&pool->cond);
}
g_mutex_unlock(&pool->data_mutex);
}
/*
* Run all extcap programs with the given arguments list, invoke the callback to
* do some processing and return the results.
*
* @param [IN] argv NULL-terminated arguments list.
* @param [IN] output_cb Thread callback function that receives the output.
* @param [IN] data_size Size of the per-program information that will be returned.
* @param [OUT] count Size of the returned array.
* @return Array of information or NULL if there are none. The first member of
* each element (char *extcap_path) must be freed.
*/
static gpointer
extcap_run_all(const char *argv[], extcap_run_cb_t output_cb, gsize data_size, guint *count)
{
/* Need enough space for at least 'extcap_path'. */
g_assert(data_size >= sizeof(char *));
GSList *paths = extcap_get_extcap_paths();
int i = 0;
#if GLIB_CHECK_VERSION(2,36,0)
int max_threads = (int)g_get_num_processors();
#else
// If the number of processors is unavailable, just use some sane maximum.
// extcap should not be CPU bound, so -1 could also be used for unlimited.
int max_threads = 8;
#endif
if (!paths) {
*count = 0;
return NULL;
}
guint64 start_time = g_get_monotonic_time();
guint paths_count = g_slist_length(paths);
/* GSList is not thread-safe, so pre-allocate an array instead. */
gpointer infos = g_malloc0_n(paths_count, data_size);
thread_pool_t pool;
pool.pool = g_thread_pool_new(extcap_thread_callback, &pool, max_threads, FALSE, NULL);
pool.count = 0;
g_cond_init(&pool.cond);
g_mutex_init(&pool.data_mutex);
for (GSList *path = paths; path; path = g_slist_next(path), i++) {
extcap_run_task_t *task = g_new0(extcap_run_task_t, 1);
task->extcap_path = (char *)path->data;
task->argv = g_strdupv((char **)argv);
task->output_cb = output_cb;
task->data = ((char *)infos) + (i * data_size);
*((char **)task->data) = (char *)path->data;
thread_pool_push(&pool, task, NULL);
}
g_slist_free(paths); /* Note: the contents are transferred to 'infos'. */
/* Wait for all (sub)tasks to complete. */
thread_pool_wait(&pool);
g_mutex_clear(&pool.data_mutex);
g_cond_clear(&pool.cond);
g_thread_pool_free(pool.pool, FALSE, TRUE);
g_log(LOG_DOMAIN_CAPTURE, G_LOG_LEVEL_DEBUG, "extcap: completed discovery of %d tools in %.3fms",
paths_count, (g_get_monotonic_time() - start_time) / 1000.0);
*count = paths_count;
return infos;
}
static void extcap_free_dlt(gpointer d, gpointer user_data _U_)
{
if (d == NULL)
{
return;
}
g_free(((extcap_dlt *)d)->name);
g_free(((extcap_dlt *)d)->display);
g_free(d);
}
static void extcap_free_dlts(GList *dlts)
{
g_list_foreach(dlts, extcap_free_dlt, NULL);
g_list_free(dlts);
}
static gboolean cb_dlt(extcap_callback_info_t cb_info)
{
GList *dlts = NULL, *temp = NULL;
if_capabilities_t *caps;
GList *linktype_list = NULL;
data_link_info_t *data_link_info;
extcap_dlt *dlt_item;
dlts = extcap_parse_dlts(cb_info.output);
temp = dlts;
g_log(LOG_DOMAIN_CAPTURE, G_LOG_LEVEL_DEBUG, "Extcap pipe %s ", cb_info.extcap);
/*
* Allocate the interface capabilities structure.
*/
caps = (if_capabilities_t *) g_malloc(sizeof * caps);
caps->can_set_rfmon = FALSE;
caps->timestamp_types = NULL;
while (dlts)
{
dlt_item = (extcap_dlt *)dlts->data;
if (dlt_item)
{
g_log(LOG_DOMAIN_CAPTURE, G_LOG_LEVEL_DEBUG,
" DLT %d name=\"%s\" display=\"%s\" ", dlt_item->number,
dlt_item->name, dlt_item->display);
data_link_info = g_new(data_link_info_t, 1);
data_link_info->dlt = dlt_item->number;
data_link_info->name = g_strdup(dlt_item->name);
data_link_info->description = g_strdup(dlt_item->display);
linktype_list = g_list_append(linktype_list, data_link_info);
}
dlts = g_list_next(dlts);
}
/* Check to see if we built a list */
if (linktype_list != NULL && cb_info.data != NULL)
{
caps->data_link_types = linktype_list;
*(if_capabilities_t **) cb_info.data = caps;
}
else
{
if (cb_info.err_str)
{
g_log(LOG_DOMAIN_CAPTURE, G_LOG_LEVEL_DEBUG, " returned no DLTs");
*(cb_info.err_str) = g_strdup("Extcap returned no DLTs");
}
g_free(caps);
}
extcap_free_dlts(temp);
return FALSE;
}
if_capabilities_t *
extcap_get_if_dlts(const gchar *ifname, char **err_str)
{
GList * arguments = NULL;
if_capabilities_t *caps = NULL;
if (err_str != NULL)
{
*err_str = NULL;
}
extcap_interface *interface = extcap_find_interface_for_ifname(ifname);
if (interface)
{
arguments = g_list_append(arguments, g_strdup(EXTCAP_ARGUMENT_LIST_DLTS));
arguments = g_list_append(arguments, g_strdup(EXTCAP_ARGUMENT_INTERFACE));
arguments = g_list_append(arguments, g_strdup(ifname));
extcap_run_one(interface, arguments, cb_dlt, &caps, err_str);
g_list_free_full(arguments, g_free);
}
return caps;
}
static void extcap_free_interface(gpointer i)
{
extcap_interface *interface = (extcap_interface *)i;
if (i == NULL)
{
return;
}
g_free(interface->call);
g_free(interface->display);
g_free(interface->version);
g_free(interface->help);
g_free(interface->extcap_path);
g_free(interface);
}
static void extcap_free_interfaces(GList *interfaces)
{
if (interfaces == NULL)
{
return;
}
g_list_free_full(interfaces, extcap_free_interface);
}
static gint
if_info_compare(gconstpointer a, gconstpointer b)
{
gint comp = 0;
const if_info_t *if_a = (const if_info_t *)a;
const if_info_t *if_b = (const if_info_t *)b;
if ((comp = g_strcmp0(if_a->name, if_b->name)) == 0)
{
return g_strcmp0(if_a->friendly_name, if_b->friendly_name);
}
return comp;
}
gchar *
extcap_get_help_for_ifname(const char *ifname)
{
extcap_interface *interface = extcap_find_interface_for_ifname(ifname);
return interface != NULL ? interface->help : NULL;
}
GList *
append_extcap_interface_list(GList *list, char **err_str _U_)
{
GList *interface_list = NULL;
extcap_interface *data = NULL;
GList *ifutilkeys_head = NULL, *ifutilkeys = NULL;
if (prefs.capture_no_extcap)
return list;
/* Update the extcap interfaces and get a list of their if_infos */
if ( !_loaded_interfaces || g_hash_table_size(_loaded_interfaces) == 0 )
extcap_load_interface_list();
ifutilkeys_head = g_hash_table_get_keys(_loaded_interfaces);
ifutilkeys = ifutilkeys_head;
while ( ifutilkeys && ifutilkeys->data )
{
extcap_info * extinfo =
(extcap_info *) g_hash_table_lookup(_loaded_interfaces, (gchar *)ifutilkeys->data);
GList * walker = extinfo->interfaces;
while ( walker && walker->data )
{
interface_list = g_list_append(interface_list, walker->data);
walker = g_list_next(walker);
}
ifutilkeys = g_list_next(ifutilkeys);
}
g_list_free(ifutilkeys_head);
/* Sort that list */
interface_list = g_list_sort(interface_list, if_info_compare);
/* Append the interfaces in that list to the list we're handed. */
while (interface_list != NULL)
{
GList *entry = g_list_first(interface_list);
data = (extcap_interface *)entry->data;
interface_list = g_list_delete_link(interface_list, entry);
if_info_t * if_info = g_new0(if_info_t, 1);
if_info->name = g_strdup(data->call);
if_info->friendly_name = g_strdup(data->display);
if_info->type = IF_EXTCAP;
if_info->extcap = g_strdup(data->extcap_path);
list = g_list_append(list, if_info);
}
return list;
}
void extcap_register_preferences(void)
{
if (prefs.capture_no_extcap)
return;
module_t *dev_module = prefs_find_module("extcap");
if (!dev_module)
{
return;
}
// Will load information about extcaps and their supported config.
extcap_load_interface_list();
}
/**
* Releases the dynamic preference value pointers. Must not be called before
* prefs_cleanup since these pointers could still be in use.
*/
void extcap_cleanup(void)
{
if (extcap_prefs_dynamic_vals)
g_hash_table_destroy(extcap_prefs_dynamic_vals);
if (_loaded_interfaces)
g_hash_table_destroy(_loaded_interfaces);
if (_tool_for_ifname)
g_hash_table_destroy(_tool_for_ifname);
}
/**
* Obtains a pointer which can store a value for the given preference name.
* The preference name that can be passed to the prefs API is stored into
* 'prefs_name'.
*
* Extcap interfaces (and their preferences) are dynamic, they can be created
* and destroyed at will. Thus their data structures are insufficient to pass to
* the preferences APIs which require pointers which are valid until the
* preferences are removed (at exit).
*/
static gchar **extcap_prefs_dynamic_valptr(const char *name, char **pref_name)
{
gchar **valp;
if (!extcap_prefs_dynamic_vals)
{
/* Initialize table only as needed, most preferences are not dynamic */
extcap_prefs_dynamic_vals = g_hash_table_new_full(g_str_hash, g_str_equal,
g_free, g_free);
}
if (!g_hash_table_lookup_extended(extcap_prefs_dynamic_vals, name,
(gpointer *)pref_name, (gpointer *)&valp))
{
/* New dynamic pref, allocate, initialize and store. */
valp = g_new0(gchar *, 1);
*pref_name = g_strdup(name);
g_hash_table_insert(extcap_prefs_dynamic_vals, *pref_name, valp);
}
return valp;
}
void extcap_free_if_configuration(GList *list, gboolean free_args)
{
GList *elem, *sl;
for (elem = g_list_first(list); elem; elem = elem->next)
{
if (elem->data != NULL)
{
sl = g_list_first((GList *)elem->data);
if (free_args)
{
extcap_free_arg_list(sl);
}
else
{
g_list_free(sl);
}
}
}
g_list_free(list);
}
struct preference *
extcap_pref_for_argument(const gchar *ifname, struct _extcap_arg *arg)
{
struct preference *pref = NULL;
GRegex *regex_name = g_regex_new("[-]+", G_REGEX_RAW, (GRegexMatchFlags) 0, NULL);
GRegex *regex_ifname = g_regex_new("(?![a-zA-Z0-9_]).", G_REGEX_RAW, (GRegexMatchFlags) 0, NULL);
if (regex_name && regex_ifname)
{
if (prefs_find_module("extcap"))
{
gchar *pref_name = g_regex_replace(regex_name, arg->call, strlen(arg->call), 0, "", (GRegexMatchFlags) 0, NULL);
gchar *ifname_underscore = g_regex_replace(regex_ifname, ifname, strlen(ifname), 0, "_", (GRegexMatchFlags) 0, NULL);
gchar *ifname_lowercase = g_ascii_strdown(ifname_underscore, -1);
gchar *pref_ifname = g_strconcat(ifname_lowercase, ".", pref_name, NULL);
pref = prefs_find_preference(prefs_find_module("extcap"), pref_ifname);
g_free(pref_name);
g_free(ifname_underscore);
g_free(ifname_lowercase);
g_free(pref_ifname);
}
}
if (regex_name)
{
g_regex_unref(regex_name);
}
if (regex_ifname)
{
g_regex_unref(regex_ifname);
}
return pref;
}
static gboolean cb_preference(extcap_callback_info_t cb_info)
{
GList *arguments = NULL;
GList **il = (GList **) cb_info.data;
module_t *dev_module = NULL;
arguments = extcap_parse_args(cb_info.output);
dev_module = prefs_find_module("extcap");
if (dev_module)
{
GList *walker = arguments;
GRegex *regex_name = g_regex_new("[-]+", G_REGEX_RAW, (GRegexMatchFlags) 0, NULL);
GRegex *regex_ifname = g_regex_new("(?![a-zA-Z0-9_]).", G_REGEX_RAW, (GRegexMatchFlags) 0, NULL);
if (regex_name && regex_ifname)
{
while (walker != NULL)
{
extcap_arg *arg = (extcap_arg *)walker->data;
arg->device_name = g_strdup(cb_info.ifname);
if (arg->save)
{
struct preference *pref = NULL;
gchar *pref_name = g_regex_replace(regex_name, arg->call, strlen(arg->call), 0, "", (GRegexMatchFlags) 0, NULL);
gchar *ifname_underscore = g_regex_replace(regex_ifname, cb_info.ifname, strlen(cb_info.ifname), 0, "_", (GRegexMatchFlags) 0, NULL);
gchar *ifname_lowercase = g_ascii_strdown(ifname_underscore, -1);
gchar *pref_ifname = g_strconcat(ifname_lowercase, ".", pref_name, NULL);
if ((pref = prefs_find_preference(dev_module, pref_ifname)) == NULL)
{
char *pref_name_for_prefs;
char *pref_title = wmem_strdup(wmem_epan_scope(), arg->display);
arg->pref_valptr = extcap_prefs_dynamic_valptr(pref_ifname, &pref_name_for_prefs);
/* Set an initial value if any (the string will be copied at registration) */
if (arg->default_complex)
{
*arg->pref_valptr = arg->default_complex->_val;
}
prefs_register_string_preference(dev_module, pref_name_for_prefs,
pref_title, pref_title, (const char **)arg->pref_valptr);
}
else
{
/* Been here before, restore stored value */
if (arg->pref_valptr == NULL)
{
arg->pref_valptr = (gchar**)g_hash_table_lookup(extcap_prefs_dynamic_vals, pref_ifname);
}
}
g_free(pref_name);
g_free(ifname_underscore);
g_free(ifname_lowercase);
g_free(pref_ifname);
}
walker = g_list_next(walker);
}
}
if (regex_name)
{
g_regex_unref(regex_name);
}
if (regex_ifname)
{
g_regex_unref(regex_ifname);
}
}
*il = g_list_append(*il, arguments);
/* By returning false, extcap_foreach will break on first found */
return TRUE;
}
GList *
extcap_get_if_configuration(const char *ifname)
{
GList * arguments = NULL;
GList *ret = NULL;
extcap_interface *interface = extcap_find_interface_for_ifname(ifname);
if (interface)
{
g_log(LOG_DOMAIN_CAPTURE, G_LOG_LEVEL_DEBUG, "Extcap path %s",
get_extcap_dir());
arguments = g_list_append(arguments, g_strdup(EXTCAP_ARGUMENT_CONFIG));
arguments = g_list_append(arguments, g_strdup(EXTCAP_ARGUMENT_INTERFACE));
arguments = g_list_append(arguments, g_strdup(ifname));
extcap_run_one(interface, arguments, cb_preference, &ret, NULL);
g_list_free_full(arguments, g_free);
}
return ret;
}
static gboolean cb_reload_preference(extcap_callback_info_t cb_info)
{
GList *arguments = NULL, * walker = NULL;
GList **il = (GList **) cb_info.data;
arguments = extcap_parse_values(cb_info.output);
walker = g_list_first(arguments);
while (walker != NULL)
{
extcap_value * val = (extcap_value *)walker->data;
*il = g_list_append(*il, val);
walker = g_list_next(walker);
}
g_list_free(arguments);
/* By returning false, extcap_foreach will break on first found */
return FALSE;
}
GList *
extcap_get_if_configuration_values(const char * ifname, const char * argname, GHashTable *arguments)
{
GList * args = NULL;
GList *ret = NULL;
extcap_interface *interface = extcap_find_interface_for_ifname(ifname);
if (interface)
{
g_log(LOG_DOMAIN_CAPTURE, G_LOG_LEVEL_DEBUG, "Extcap path %s",
get_extcap_dir());
args = g_list_append(args, g_strdup(EXTCAP_ARGUMENT_CONFIG));
args = g_list_append(args, g_strdup(EXTCAP_ARGUMENT_INTERFACE));
args = g_list_append(args, g_strdup(ifname));
args = g_list_append(args, g_strdup(EXTCAP_ARGUMENT_RELOAD_OPTION));
args = g_list_append(args, g_strdup(argname));
if ( arguments )
{
GList * keys = g_hash_table_get_keys(arguments);
GList * walker = g_list_first(keys);
while ( walker )
{
const gchar * key_data = (const gchar *)walker->data;
args = g_list_append(args, g_strdup(key_data));
args = g_list_append(args, g_strdup((const gchar *)g_hash_table_lookup(arguments, key_data)));
walker = g_list_next(walker);
}
g_list_free(keys);
}
extcap_run_one(interface, args, cb_reload_preference, &ret, NULL);
g_list_free_full(args, g_free);
}
return ret;
}
/**
* If is_required is FALSE: returns TRUE if the extcap interface has
* configurable options.
* If is_required is TRUE: returns TRUE when the extcap interface has
* configurable options that required modification. (For example, when an
* argument is required but empty.)
*/
gboolean
extcap_has_configuration(const char *ifname, gboolean is_required)
{
GList *arguments = 0;
GList *walker = 0, * item = 0;