2 * Copyright 2008, The Android Open Source Project
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
8 * http://www.apache.org/licenses/LICENSE-2.0
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
22 #include "hardware_legacy/wifi.h"
23 #include "libwpa_client/wpa_ctrl.h"
25 #define LOG_TAG "WifiHW"
26 #include "cutils/log.h"
27 #include "cutils/memory.h"
28 #include "cutils/misc.h"
29 #include "cutils/properties.h"
30 #include "private/android_filesystem_config.h"
31 #ifdef HAVE_LIBC_SYSTEM_PROPERTIES
32 #define _REALLY_INCLUDE_SYS__SYSTEM_PROPERTIES_H_
33 #include <sys/_system_properties.h>
36 static struct wpa_ctrl *ctrl_conn;
37 static struct wpa_ctrl *monitor_conn;
40 extern int ifc_init();
41 extern void ifc_close();
42 extern char *dhcp_lasterror();
43 extern void get_dhcp_info();
44 extern int init_module(void *, unsigned long, const char *);
45 extern int delete_module(const char *, unsigned int);
47 static char iface[PROPERTY_VALUE_MAX];
48 // TODO: use new ANDROID_SOCKET mechanism, once support for multiple
51 static const char IFACE_DIR[] = "/data/system/wpa_supplicant";
52 static const char DRIVER_MODULE_NAME[] = "wlan";
53 static const char DRIVER_MODULE_TAG[] = "wlan ";
54 static const char DRIVER_MODULE_PATH[] = "/system/lib/modules/wlan.ko";
55 static const char FIRMWARE_LOADER[] = "wlan_loader";
56 static const char DRIVER_PROP_NAME[] = "wlan.driver.status";
57 static const char SUPPLICANT_NAME[] = "wpa_supplicant";
58 static const char SUPP_PROP_NAME[] = "init.svc.wpa_supplicant";
59 static const char SUPP_CONFIG_TEMPLATE[]= "/system/etc/wifi/wpa_supplicant.conf";
60 static const char SUPP_CONFIG_FILE[] = "/data/misc/wifi/wpa_supplicant.conf";
61 static const char MODULE_FILE[] = "/proc/modules";
63 static int insmod(const char *filename)
69 module = load_file(filename, &size);
73 ret = init_module(module, size, "");
80 static int rmmod(const char *modname)
85 while (maxtry-- > 0) {
86 ret = delete_module(modname, O_NONBLOCK | O_EXCL);
87 if (ret < 0 && errno == EAGAIN)
94 LOGD("Unable to unload driver module \"%s\": %s\n",
95 modname, strerror(errno));
99 int do_dhcp_request(int *ipaddr, int *gateway, int *mask,
100 int *dns1, int *dns2, int *server, int *lease) {
101 /* For test driver, always report success */
102 if (strcmp(iface, "sta") == 0)
108 if (do_dhcp(iface) < 0) {
113 get_dhcp_info(ipaddr, gateway, mask, dns1, dns2, server, lease);
117 const char *get_dhcp_error_string() {
118 return dhcp_lasterror();
121 static int check_driver_loaded() {
122 char driver_status[PROPERTY_VALUE_MAX];
124 char line[sizeof(DRIVER_MODULE_TAG)+10];
126 if (!property_get(DRIVER_PROP_NAME, driver_status, NULL)
127 || strcmp(driver_status, "ok") != 0) {
128 return 0; /* driver not loaded */
131 * If the property says the driver is loaded, check to
132 * make sure that the property setting isn't just left
133 * over from a previous manual shutdown or a runtime
136 if ((proc = fopen(MODULE_FILE, "r")) == NULL) {
137 LOGW("Could not open %s: %s", MODULE_FILE, strerror(errno));
138 property_set(DRIVER_PROP_NAME, "unloaded");
141 while ((fgets(line, sizeof(line), proc)) != NULL) {
142 if (strncmp(line, DRIVER_MODULE_TAG, strlen(DRIVER_MODULE_TAG)) == 0) {
148 property_set(DRIVER_PROP_NAME, "unloaded");
152 int wifi_load_driver()
154 char driver_status[PROPERTY_VALUE_MAX];
155 int count = 100; /* wait at most 20 seconds for completion */
157 if (check_driver_loaded()) {
161 if (insmod(DRIVER_MODULE_PATH) < 0)
164 property_set("ctl.start", FIRMWARE_LOADER);
166 while (count-- > 0) {
167 if (property_get(DRIVER_PROP_NAME, driver_status, NULL)) {
168 if (strcmp(driver_status, "ok") == 0)
170 else if (strcmp(DRIVER_PROP_NAME, "failed") == 0)
175 property_set(DRIVER_PROP_NAME, "timeout");
179 int wifi_unload_driver()
181 int count = 20; /* wait at most 10 seconds for completion */
183 if (rmmod(DRIVER_MODULE_NAME) == 0) {
184 while (count-- > 0) {
185 if (!check_driver_loaded())
197 int ensure_config_file_exists()
203 if (access(SUPP_CONFIG_FILE, R_OK|W_OK) == 0) {
205 } else if (errno != ENOENT) {
206 LOGE("Cannot access \"%s\": %s", SUPP_CONFIG_FILE, strerror(errno));
210 srcfd = open(SUPP_CONFIG_TEMPLATE, O_RDONLY);
212 LOGE("Cannot open \"%s\": %s", SUPP_CONFIG_TEMPLATE, strerror(errno));
216 destfd = open(SUPP_CONFIG_FILE, O_CREAT|O_WRONLY, 0660);
219 LOGE("Cannot create \"%s\": %s", SUPP_CONFIG_FILE, strerror(errno));
223 while ((nread = read(srcfd, buf, sizeof(buf))) != 0) {
225 LOGE("Error reading \"%s\": %s", SUPP_CONFIG_TEMPLATE, strerror(errno));
228 unlink(SUPP_CONFIG_FILE);
231 write(destfd, buf, nread);
237 if (chown(SUPP_CONFIG_FILE, AID_SYSTEM, AID_WIFI) < 0) {
238 LOGE("Error changing group ownership of %s to %d: %s",
239 SUPP_CONFIG_FILE, AID_WIFI, strerror(errno));
240 unlink(SUPP_CONFIG_FILE);
246 int wifi_start_supplicant()
248 char supp_status[PROPERTY_VALUE_MAX] = {'\0'};
249 int count = 200; /* wait at most 20 seconds for completion */
250 #ifdef HAVE_LIBC_SYSTEM_PROPERTIES
255 /* Check whether already running */
256 if (property_get(SUPP_PROP_NAME, supp_status, NULL)
257 && strcmp(supp_status, "running") == 0) {
261 /* Before starting the daemon, make sure its config file exists */
262 if (ensure_config_file_exists() < 0) {
263 LOGE("Wi-Fi will not be enabled");
267 /* Clear out any stale socket files that might be left over. */
270 #ifdef HAVE_LIBC_SYSTEM_PROPERTIES
272 * Get a reference to the status property, so we can distinguish
273 * the case where it goes stopped => running => stopped (i.e.,
274 * it start up, but fails right away) from the case in which
275 * it starts in the stopped state and never manages to start
278 pi = __system_property_find(SUPP_PROP_NAME);
283 property_set("ctl.start", SUPPLICANT_NAME);
286 while (count-- > 0) {
287 #ifdef HAVE_LIBC_SYSTEM_PROPERTIES
289 pi = __system_property_find(SUPP_PROP_NAME);
292 __system_property_read(pi, NULL, supp_status);
293 if (strcmp(supp_status, "running") == 0) {
295 } else if (pi->serial != serial &&
296 strcmp(supp_status, "stopped") == 0) {
301 if (property_get(SUPP_PROP_NAME, supp_status, NULL)) {
302 if (strcmp(supp_status, "running") == 0)
311 int wifi_stop_supplicant()
313 char supp_status[PROPERTY_VALUE_MAX] = {'\0'};
314 int count = 50; /* wait at most 5 seconds for completion */
316 /* Check whether supplicant already stopped */
317 if (property_get(SUPP_PROP_NAME, supp_status, NULL)
318 && strcmp(supp_status, "stopped") == 0) {
322 property_set("ctl.stop", SUPPLICANT_NAME);
325 while (count-- > 0) {
326 if (property_get(SUPP_PROP_NAME, supp_status, NULL)) {
327 if (strcmp(supp_status, "stopped") == 0)
335 int wifi_connect_to_supplicant()
338 char supp_status[PROPERTY_VALUE_MAX] = {'\0'};
340 /* Make sure supplicant is running */
341 if (!property_get(SUPP_PROP_NAME, supp_status, NULL)
342 || strcmp(supp_status, "running") != 0) {
343 LOGE("Supplicant not running, cannot connect");
347 property_get("wifi.interface", iface, "sta");
349 if (access(IFACE_DIR, F_OK) == 0) {
350 snprintf(ifname, sizeof(ifname), "%s/%s", IFACE_DIR, iface);
352 strlcpy(ifname, iface, sizeof(ifname));
355 ctrl_conn = wpa_ctrl_open(ifname);
356 if (ctrl_conn == NULL) {
357 LOGE("Unable to open connection to supplicant on \"%s\": %s",
358 ifname, strerror(errno));
361 monitor_conn = wpa_ctrl_open(ifname);
362 if (monitor_conn == NULL) {
363 wpa_ctrl_close(ctrl_conn);
367 if (wpa_ctrl_attach(monitor_conn) != 0) {
368 wpa_ctrl_close(monitor_conn);
369 wpa_ctrl_close(ctrl_conn);
370 ctrl_conn = monitor_conn = NULL;
376 int wifi_send_command(struct wpa_ctrl *ctrl, const char *cmd, char *reply, size_t *reply_len)
380 if (ctrl_conn == NULL) {
381 LOGV("Not connected to wpa_supplicant - \"%s\" command dropped.\n", cmd);
384 ret = wpa_ctrl_request(ctrl, cmd, strlen(cmd), reply, reply_len, NULL);
386 LOGD("'%s' command timed out.\n", cmd);
388 } else if (ret < 0 || strncmp(reply, "FAIL", 4) == 0) {
391 if (strncmp(cmd, "PING", 4) == 0) {
392 reply[*reply_len] = '\0';
397 int wifi_wait_for_event(char *buf, size_t buflen)
399 size_t nread = buflen - 1;
404 struct timeval *tptr;
406 if (monitor_conn == NULL)
409 result = wpa_ctrl_recv(monitor_conn, buf, &nread);
411 LOGD("wpa_ctrl_recv failed: %s\n", strerror(errno));
415 /* LOGD("wait_for_event: result=%d nread=%d string=\"%s\"\n", result, nread, buf); */
416 /* Check for EOF on the socket */
417 if (result == 0 && nread == 0) {
418 /* Fabricate an event to pass up */
419 LOGD("Received EOF on supplicant socket\n");
420 strncpy(buf, WPA_EVENT_TERMINATING " - signal 0 received", buflen-1);
421 buf[buflen-1] = '\0';
425 * Events strings are in the format
429 * where N is the message level in numerical form (0=VERBOSE, 1=DEBUG,
430 * etc.) and XXX is the event name. The level information is not useful
431 * to us, so strip it off.
434 char *match = strchr(buf, '>');
436 nread -= (match+1-buf);
437 memmove(buf, match+1, nread+1);
443 void wifi_close_supplicant_connection()
445 if (ctrl_conn != NULL) {
446 wpa_ctrl_close(ctrl_conn);
449 if (monitor_conn != NULL) {
450 wpa_ctrl_close(monitor_conn);
455 int wifi_command(const char *command, char *reply, size_t *reply_len)
457 return wifi_send_command(ctrl_conn, command, reply, reply_len);