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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
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#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
#ifdef HAVE_SYS_TYPES_H
#include <sys/types.h>
#endif
#ifdef HAVE_SYS_WAIT_H
#include <sys/wait.h>
#endif
#include <glib.h>
#include <log.h>
#include <epan/prefs.h>
#include <wsutil/file_util.h>
#include <wsutil/filesystem.h>
#include <wsutil/tempfile.h>
#include "capture_opts.h"
#include "extcap.h"
#include "extcap_parser.h"
#include "extcap_spawn.h"
#ifdef _WIN32
static HANDLE pipe_h = NULL;
#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.
*/
static GHashTable * _tool_for_ifname = 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);
static void extcap_load_interface_list(void);
GHashTable *
extcap_loaded_interfaces(void)
{
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;
}
guint extcap_count(void)
{
const char *dirname = get_extcap_dir();
GDir *dir;
guint count;
count = 0;
if ((dir = g_dir_open(dirname, 0, NULL)) != NULL)
{
GString *extcap_path = NULL;
const gchar *file;
extcap_path = g_string_new("");
while ((file = g_dir_read_name(dir)) != NULL)
{
/* full path to extcap binary */
g_string_printf(extcap_path, "%s" G_DIR_SEPARATOR_S "%s", dirname, file);
/* treat anything executable as an extcap binary */
if (g_file_test(extcap_path->str, G_FILE_TEST_IS_EXECUTABLE))
{
count++;
}
}
g_dir_close(dir);
g_string_free(extcap_path, TRUE);
}
return count;
}
static gboolean
extcap_if_exists(const gchar *ifname)
{
if (!ifname || !_tool_for_ifname)
{
return FALSE;
}
if (g_hash_table_lookup(_tool_for_ifname, ifname))
{
return TRUE;
}
return FALSE;
}
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 gboolean
extcap_if_exists_for_extcap(const gchar *ifname, const gchar *extcap)
{
extcap_interface *entry = extcap_find_interface_for_ifname(ifname);
if (entry && strcmp(entry->extcap_path, extcap) == 0)
{
return TRUE;
}
return FALSE;
}
static gchar *
extcap_if_executable(const gchar *ifname)
{
extcap_interface *interface = extcap_find_interface_for_ifname(ifname);
return interface != NULL ? interface->extcap_path : NULL;
}
/* Note: args does not need to be NULL-terminated. */
static gboolean extcap_foreach(gint argc, gchar **args,
extcap_cb_t cb, extcap_callback_info_t cb_info)
{
GDir *dir;
gboolean keep_going;
const char *dirname = get_extcap_dir();
keep_going = TRUE;
if ((dir = g_dir_open(dirname, 0, NULL)) != NULL)
{
GString *extcap_path = NULL;
const gchar *file;
extcap_path = g_string_new("");
while (keep_going && (file = g_dir_read_name(dir)) != NULL)
{
gchar *command_output = NULL;
/* full path to extcap binary */
g_string_printf(extcap_path, "%s" G_DIR_SEPARATOR_S "%s", dirname, file);
if (extcap_if_exists(cb_info.ifname) && !extcap_if_exists_for_extcap(cb_info.ifname, extcap_path->str))
{
continue;
}
if (extcap_spawn_sync((gchar *) dirname, extcap_path->str, argc, args, &command_output))
{
cb_info.output = command_output;
cb_info.extcap = extcap_path->str;
keep_going = cb(cb_info);
}
g_free(command_output);
}
g_dir_close(dir);
g_string_free(extcap_path, TRUE);
}
return keep_going;
}
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;
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)
{
gchar *argv[3];
gint i;
if_capabilities_t *caps = NULL;
if (err_str != NULL)
{
*err_str = NULL;
}
if (extcap_if_exists(ifname))
{
argv[0] = g_strdup(EXTCAP_ARGUMENT_LIST_DLTS);
argv[1] = g_strdup(EXTCAP_ARGUMENT_INTERFACE);
argv[2] = g_strdup(ifname);
extcap_callback_info_t cb_info;
cb_info.data = ∩︀
cb_info.err_str = err_str;
cb_info.ifname = ifname;
extcap_foreach(3, argv, cb_dlt, cb_info);
for (i = 0; i < 3; ++i)
{
g_free(argv[i]);
}
}
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_foreach(interfaces, (GFunc)extcap_free_interface, NULL);
g_list_free(interfaces);
}
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 = NULL;
/* 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 = g_hash_table_get_keys(_loaded_interfaces);
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);
}
/* 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;
}
static void
extcap_register_preferences_callback(gpointer key, gpointer value _U_, gpointer user_data _U_)
{
GList *arguments;
arguments = extcap_get_if_configuration((gchar *)key);
/* Memory for prefs are external to an interface, they are part of
* extcap core, so the parsed arguments can be freed. */
extcap_free_if_configuration(arguments, TRUE);
}
void extcap_register_preferences(void)
{
module_t *dev_module = prefs_find_module("extcap");
if (!dev_module)
{
return;
}
if ( !_loaded_interfaces || g_hash_table_size(_loaded_interfaces) == 0 )
extcap_load_interface_list();
g_hash_table_foreach(_tool_for_ifname, extcap_register_preferences_callback, NULL);
}
/**
* 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);
}
void extcap_pref_store(extcap_arg *arg, const char *newval)
{
if (arg && arg->pref_valptr != NULL)
{
g_free(*arg->pref_valptr);
*arg->pref_valptr = g_strdup(newval);
}
}
/**
* 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("[-]+", (GRegexCompileFlags) 0, (GRegexMatchFlags) 0, NULL);
GRegex *regex_ifname = g_regex_new("(?![a-zA-Z1-9_]).", (GRegexCompileFlags) 0, (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("[-]+", (GRegexCompileFlags) 0, (GRegexMatchFlags) 0, NULL);
GRegex *regex_ifname = g_regex_new("(?![a-zA-Z1-9_]).", (GRegexCompileFlags) 0, (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)
{
gchar *argv[3];
GList *ret = NULL;
gchar **err_str = NULL;
int i;
if (extcap_if_exists(ifname))
{
g_log(LOG_DOMAIN_CAPTURE, G_LOG_LEVEL_DEBUG, "Extcap path %s",
get_extcap_dir());
argv[0] = g_strdup(EXTCAP_ARGUMENT_CONFIG);
argv[1] = g_strdup(EXTCAP_ARGUMENT_INTERFACE);
argv[2] = g_strdup(ifname);
extcap_callback_info_t cb_info;
cb_info.data = &ret;
cb_info.err_str = err_str;
cb_info.ifname = ifname;
extcap_foreach(3, argv, cb_preference, cb_info);
for (i = 0; i < 3; i++)
{
g_free(argv[i]);
}
}
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;
gboolean found = FALSE;
arguments = extcap_get_if_configuration((const char *)(ifname));
walker = g_list_first(arguments);
while (walker != NULL && !found)
{
item = g_list_first((GList *)(walker->data));
while (item != NULL && !found)
{
if ((extcap_arg *)(item->data) != NULL)
{
extcap_arg *arg = (extcap_arg *)(item->data);
/* Should required options be present, or any kind of options */
if (!is_required)
{
found = TRUE;
}
else if (arg->is_required)
{
const gchar *stored = NULL;
const gchar *defval = NULL;
if (arg->pref_valptr != NULL)
{
stored = *arg->pref_valptr;
}
if (arg->default_complex != NULL && arg->default_complex->_val != NULL)
{
defval = arg->default_complex->_val;
}
if (arg->is_required)
{
/* If stored and defval is identical and the argument is required,
* configuration is needed */
if (defval && stored && g_strcmp0(stored, defval) == 0)
{
found = TRUE;
}
else if (!defval && (!stored || !*stored))
{
found = TRUE;
}
}
if (arg->arg_type == EXTCAP_ARG_FILESELECT)
{
if (arg->fileexists && !(file_exists(defval) || file_exists(stored)))
{
found = TRUE;
}
}
}
}
item = item->next;
}
walker = walker->next;
}
extcap_free_if_configuration(arguments, TRUE);
return found;
}
/* taken from capchild/capture_sync.c */
static gboolean pipe_data_available(int pipe_fd)
{
#ifdef _WIN32 /* PeekNamedPipe */
HANDLE hPipe = (HANDLE) _get_osfhandle(pipe_fd);
DWORD bytes_avail;
if (hPipe == INVALID_HANDLE_VALUE)
{
return FALSE;
}
if (! PeekNamedPipe(hPipe, NULL, 0, NULL, &bytes_avail, NULL))
{
return FALSE;
}
if (bytes_avail > 0)
{
return TRUE;
}
return FALSE;
#else /* select */
fd_set rfds;
struct timeval timeout;
FD_ZERO(&rfds);
FD_SET(pipe_fd, &rfds);
timeout.tv_sec = 0;
timeout.tv_usec = 0;
if (select(pipe_fd + 1, &rfds, NULL, NULL, &timeout) > 0)
{
return TRUE;
}
return FALSE;
#endif
}
void extcap_if_cleanup(capture_options *capture_opts, gchar **errormsg)
{
interface_options interface_opts;
extcap_userdata *userdata;
guint icnt = 0;
gboolean overwrite_exitcode;
gchar *buffer;
#define STDERR_BUFFER_SIZE 1024
for (icnt = 0; icnt < capture_opts->ifaces->len; icnt++)
{
interface_opts = g_array_index(capture_opts->ifaces, interface_options,
icnt);
/* skip native interfaces */
if (interface_opts.if_type != IF_EXTCAP)
{
continue;
}
overwrite_exitcode = FALSE;
g_log(LOG_DOMAIN_CAPTURE, G_LOG_LEVEL_DEBUG,
"Extcap [%s] - Cleaning up fifo: %s; PID: %d", interface_opts.name,
interface_opts.extcap_fifo, interface_opts.extcap_pid);
#ifdef _WIN32
if (pipe_h)
{
g_log(LOG_DOMAIN_CAPTURE, G_LOG_LEVEL_DEBUG,
"Extcap [%s] - Closing pipe", interface_opts.name);
FlushFileBuffers(pipe_h);
DisconnectNamedPipe(pipe_h);
CloseHandle(pipe_h);
}
#else
if (interface_opts.extcap_fifo != NULL && file_exists(interface_opts.extcap_fifo))
{
/* the fifo will not be freed here, but with the other capture_opts in capture_sync */
ws_unlink(interface_opts.extcap_fifo);
interface_opts.extcap_fifo = NULL;
}
#endif
/* Maybe the client closed and removed fifo, but ws should check if
* pid should be closed */
g_log(LOG_DOMAIN_CAPTURE, G_LOG_LEVEL_DEBUG,
"Extcap [%s] - Closing spawned PID: %d", interface_opts.name,
interface_opts.extcap_pid);
userdata = (extcap_userdata *) interface_opts.extcap_userdata;
if (userdata)
{
if (userdata->extcap_stderr_rd > 0 && pipe_data_available(userdata->extcap_stderr_rd))
{
buffer = (gchar *)g_malloc0(sizeof(gchar) * STDERR_BUFFER_SIZE + 1);
#ifdef _WIN32
win32_readfrompipe((HANDLE)_get_osfhandle(userdata->extcap_stderr_rd), STDERR_BUFFER_SIZE, buffer);
#else
if (read(userdata->extcap_stderr_rd, buffer, sizeof(gchar) * STDERR_BUFFER_SIZE) <= 0)
{
buffer[0] = '\0';
}
#endif
if (strlen(buffer) > 0)
{
userdata->extcap_stderr = g_strdup_printf("%s", buffer);
userdata->exitcode = 1;
}
g_free(buffer);
}
#ifndef _WIN32
/* Final child watch may not have been called */
if (interface_opts.extcap_child_watch != 0)
{
extcap_child_watch_cb(userdata->pid, 0, capture_opts);
/* it will have changed in extcap_child_watch_cb */
interface_opts = g_array_index(capture_opts->ifaces, interface_options,
icnt);
}
#endif
if (userdata->extcap_stderr != NULL)
{
overwrite_exitcode = TRUE;
}
if (overwrite_exitcode || userdata->exitcode != 0)
{
if (userdata->extcap_stderr != 0)
{
if (*errormsg == NULL)
{
*errormsg = g_strdup_printf("Error by extcap pipe: %s", userdata->extcap_stderr);
}
else
{
gchar *temp = g_strconcat(*errormsg, "\nError by extcap pipe: " , userdata->extcap_stderr, NULL);
g_free(*errormsg);
*errormsg = temp;
}
g_free(userdata->extcap_stderr);
}
userdata->extcap_stderr = NULL;
userdata->exitcode = 0;
}
}
if (interface_opts.extcap_child_watch > 0)
{
g_source_remove(interface_opts.extcap_child_watch);
interface_opts.extcap_child_watch = 0;
}
if (interface_opts.extcap_pid != INVALID_EXTCAP_PID)
{
#ifdef _WIN32
TerminateProcess(interface_opts.extcap_pid, 0);
#endif
g_spawn_close_pid(interface_opts.extcap_pid);
interface_opts.extcap_pid = INVALID_EXTCAP_PID;
g_free(interface_opts.extcap_userdata);
interface_opts.extcap_userdata = NULL;
}
/* Make sure modified interface_opts is saved in capture_opts. */
capture_opts->ifaces = g_array_remove_index(capture_opts->ifaces, icnt);
g_array_insert_val(capture_opts->ifaces, icnt, interface_opts);
}
}
static gboolean
extcap_add_arg_and_remove_cb(gpointer key, gpointer value, gpointer data)
{
GPtrArray *args = (GPtrArray *)data;
if (key != NULL)
{
g_ptr_array_add(args, g_strdup((const gchar *)key));
if (value != NULL)
{
g_ptr_array_add(args, g_strdup((const gchar *)value));
}
return TRUE;
}