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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/types.h>
#include <dirent.h>
#include "wpa_ctrl.h"
#include "plugin.h"
#define WIRELESS_PATH PLUGIN_ROOT_PATH "/wireless"
#define WIRELESS_INTERFACE PLUGIN_ROOT_INTF ".wireless"
static int init(plugin_t *plugin, DBusConnection *connection);
static void deinit(plugin_t *plugin, DBusConnection *connection);
static void handle_incoming(plugin_t *plugin, DBusConnection *connection);
static DBusHandlerResult handle_message(DBusConnection *connection, DBusMessage *message, plugin_t *plugin);
static DBusHandlerResult select_network(DBusConnection *connection, DBusMessage *message, plugin_t *plugin);
static DBusHandlerResult wpa_supplicant_request(DBusConnection *connection, DBusMessage *message, plugin_t *plugin, char *cmd);
typedef struct {
struct wpa_ctrl *ctrl_conn;
const char *interface;
} w_plugin_t;
static int init(plugin_t *plugin, DBusConnection *connection) {
const char *ctrl_iface_dir = "/var/run/wpa_supplicant";
w_plugin_t *w_plugin;
w_plugin = malloc(sizeof(w_plugin_t));
if (!w_plugin) {
fprintf(stderr, "unable to malloc w_plugin\n");
return -1;
}
w_plugin->ctrl_conn = NULL;
DIR *dir = opendir(ctrl_iface_dir);
if (dir) {
struct dirent *dent;
while ((dent = readdir(dir))) {
char *cfile;
int flen;
if (strcmp(dent->d_name, ".") == 0 ||
strcmp(dent->d_name, "..") == 0)
continue;
printf("Selected interface '%s'\n",
dent->d_name);
flen = strlen(ctrl_iface_dir) + strlen(dent->d_name) + 2;
cfile = malloc(flen);
if (cfile == NULL)
return -1;
snprintf(cfile, flen, "%s/%s", ctrl_iface_dir, dent->d_name);
w_plugin->ctrl_conn = wpa_ctrl_open(cfile);
w_plugin->interface = strdup(dent->d_name);
free(cfile);
break;
}
closedir(dir);
}
if (w_plugin->ctrl_conn != NULL) {
plugin->fd = wpa_ctrl_get_fd(w_plugin->ctrl_conn);
wpa_ctrl_attach(w_plugin->ctrl_conn);
} else {
/* do not fail, the plugin will try to re-init when needed */
plugin->fd = -1;
}
plugin->priv = (void *) w_plugin;
return 0;
}
static void deinit(plugin_t *plugin, DBusConnection *connection) {
if (plugin->fd > 0)
close(plugin->fd);
}
static void notify_event(DBusConnection *bus, plugin_t *plugin, char *event) {
w_plugin_t *w_plugin = (w_plugin_t *) plugin->priv;
DBusMessage *message;
message = dbus_message_new_signal(WIRELESS_PATH,
WIRELESS_INTERFACE,
"Event");
dbus_message_append_args(message,
DBUS_TYPE_STRING,
&event,
DBUS_TYPE_STRING,
&w_plugin->interface,
DBUS_TYPE_INVALID);
dbus_connection_send(bus, message, NULL);
dbus_connection_flush(bus);
dbus_message_unref(message);
}
static void handle_incoming(plugin_t *plugin, DBusConnection *connection) {
w_plugin_t *w_plugin = (w_plugin_t *) plugin->priv;
char buf[2048];
size_t len = sizeof(buf);
wpa_ctrl_recv(w_plugin->ctrl_conn, buf, &len);
buf[len] = '\0';
printf("received event for %s: %s\n", w_plugin->interface, buf);
notify_event(connection, plugin, buf);
}
static DBusHandlerResult handle_message(DBusConnection *connection, DBusMessage *message, plugin_t *plugin) {
if (dbus_message_is_method_call(message, WIRELESS_INTERFACE, "ScanResults")) {
return wpa_supplicant_request(connection, message, plugin, "SCAN_RESULTS");
} else if (dbus_message_is_method_call(message, WIRELESS_INTERFACE, "ListNetworks")) {
return wpa_supplicant_request(connection, message, plugin, "LIST_NETWORKS");
} else if (dbus_message_is_method_call(message, WIRELESS_INTERFACE, "SelectNetwork")) {
return select_network(connection, message, plugin);
}
return DBUS_HANDLER_RESULT_NOT_YET_HANDLED;
}
static DBusHandlerResult select_network(DBusConnection *connection, DBusMessage *message, plugin_t *plugin) {
DBusError error;
u_int32_t net;
char cmd[32];
dbus_error_init (&error);
if (!dbus_message_get_args (message,
&error,
DBUS_TYPE_UINT32,
&net,
DBUS_TYPE_INVALID)) {
fprintf(stderr, "select_network(): failed to read D-BUS message args: %s\n", error.message);
dbus_error_free (&error);
return DBUS_HANDLER_RESULT_NOT_YET_HANDLED;
}
dbus_error_free (&error);
snprintf(cmd, sizeof(cmd), "SELECT_NETWORK %u", net);
return wpa_supplicant_request(connection, message, plugin, cmd);
}
static DBusHandlerResult wpa_supplicant_request(DBusConnection *connection, DBusMessage *message, plugin_t *plugin, char *cmd) {
w_plugin_t *w_plugin = (w_plugin_t *) plugin->priv;
DBusMessage *reply;
char buf[2048];
size_t len;
int ret = -1;
/* DBus wants a char** for strings, and &char[] == char*, so use temporary variables */
char *tmp_buf;
len = sizeof(buf) - 1;
if (w_plugin->ctrl_conn) {
ret = wpa_ctrl_request(w_plugin->ctrl_conn, cmd, strlen(cmd), buf, &len, NULL);
}
if (ret == -1) {
fprintf(stderr, "connection to wpa_supplicant daemon lost, reconnecting\n");
init(plugin, connection);
w_plugin = (w_plugin_t *) plugin->priv;
if (w_plugin->ctrl_conn) {
ret = wpa_ctrl_request(w_plugin->ctrl_conn, cmd, strlen(cmd), buf, &len, NULL);
}
}
if (ret != 0) {
fprintf(stderr, "unable to request command\n");
return DBUS_HANDLER_RESULT_NOT_YET_HANDLED;
}
buf[len] = '\0';
reply = dbus_message_new_method_return(message);
tmp_buf = buf;
dbus_message_append_args(reply,
DBUS_TYPE_STRING,
&tmp_buf,
DBUS_TYPE_INVALID);
dbus_connection_send(connection, reply, NULL);
dbus_connection_flush(connection);
dbus_message_unref(reply);
return DBUS_HANDLER_RESULT_HANDLED;
}
plugin_t wpa_supplicant_plugin = {
.name = "Wireless",
.path = WIRELESS_PATH,
.init = init,
.handle_incoming = handle_incoming,
.handle_message = handle_message,
.deinit = deinit,
};
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