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 #ifndef WIFI_DRIVER_MODULE_PATH
52 #define WIFI_DRIVER_MODULE_PATH "/system/lib/modules/wlan.ko"
54 #ifndef WIFI_DRIVER_MODULE_NAME
55 #define WIFI_DRIVER_MODULE_NAME "wlan"
57 #ifndef WIFI_DRIVER_MODULE_ARG
58 #define WIFI_DRIVER_MODULE_ARG ""
60 #ifndef WIFI_FIRMWARE_LOADER
61 #define WIFI_FIRMWARE_LOADER ""
63 #define WIFI_TEST_INTERFACE "sta"
65 static const char IFACE_DIR[] = "/data/system/wpa_supplicant";
66 static const char DRIVER_MODULE_NAME[] = WIFI_DRIVER_MODULE_NAME;
67 static const char DRIVER_MODULE_TAG[] = WIFI_DRIVER_MODULE_NAME " ";
68 static const char DRIVER_MODULE_PATH[] = WIFI_DRIVER_MODULE_PATH;
69 static const char DRIVER_MODULE_ARG[] = WIFI_DRIVER_MODULE_ARG;
70 static const char FIRMWARE_LOADER[] = WIFI_FIRMWARE_LOADER;
71 static const char DRIVER_PROP_NAME[] = "wlan.driver.status";
72 static const char SUPPLICANT_NAME[] = "wpa_supplicant";
73 static const char SUPP_PROP_NAME[] = "init.svc.wpa_supplicant";
74 static const char SUPP_CONFIG_TEMPLATE[]= "/system/etc/wifi/wpa_supplicant.conf";
75 static const char SUPP_CONFIG_FILE[] = "/data/misc/wifi/wpa_supplicant.conf";
76 static const char MODULE_FILE[] = "/proc/modules";
78 static int insmod(const char *filename, const char *args)
84 module = load_file(filename, &size);
88 ret = init_module(module, size, args);
95 static int rmmod(const char *modname)
100 while (maxtry-- > 0) {
101 ret = delete_module(modname, O_NONBLOCK | O_EXCL);
102 if (ret < 0 && errno == EAGAIN)
109 LOGD("Unable to unload driver module \"%s\": %s\n",
110 modname, strerror(errno));
114 int do_dhcp_request(int *ipaddr, int *gateway, int *mask,
115 int *dns1, int *dns2, int *server, int *lease) {
116 /* For test driver, always report success */
117 if (strcmp(iface, WIFI_TEST_INTERFACE) == 0)
123 if (do_dhcp(iface) < 0) {
128 get_dhcp_info(ipaddr, gateway, mask, dns1, dns2, server, lease);
132 const char *get_dhcp_error_string() {
133 return dhcp_lasterror();
136 static int check_driver_loaded() {
137 char driver_status[PROPERTY_VALUE_MAX];
139 char line[sizeof(DRIVER_MODULE_TAG)+10];
141 if (!property_get(DRIVER_PROP_NAME, driver_status, NULL)
142 || strcmp(driver_status, "ok") != 0) {
143 return 0; /* driver not loaded */
146 * If the property says the driver is loaded, check to
147 * make sure that the property setting isn't just left
148 * over from a previous manual shutdown or a runtime
151 if ((proc = fopen(MODULE_FILE, "r")) == NULL) {
152 LOGW("Could not open %s: %s", MODULE_FILE, strerror(errno));
153 property_set(DRIVER_PROP_NAME, "unloaded");
156 while ((fgets(line, sizeof(line), proc)) != NULL) {
157 if (strncmp(line, DRIVER_MODULE_TAG, strlen(DRIVER_MODULE_TAG)) == 0) {
163 property_set(DRIVER_PROP_NAME, "unloaded");
167 int wifi_load_driver()
169 char driver_status[PROPERTY_VALUE_MAX];
170 int count = 100; /* wait at most 20 seconds for completion */
172 if (check_driver_loaded()) {
176 if (insmod(DRIVER_MODULE_PATH, DRIVER_MODULE_ARG) < 0)
179 if (strcmp(FIRMWARE_LOADER,"") == 0) {
181 property_set(DRIVER_PROP_NAME, "ok");
184 property_set("ctl.start", FIRMWARE_LOADER);
187 while (count-- > 0) {
188 if (property_get(DRIVER_PROP_NAME, driver_status, NULL)) {
189 if (strcmp(driver_status, "ok") == 0)
191 else if (strcmp(DRIVER_PROP_NAME, "failed") == 0)
196 property_set(DRIVER_PROP_NAME, "timeout");
200 int wifi_unload_driver()
202 int count = 20; /* wait at most 10 seconds for completion */
204 if (rmmod(DRIVER_MODULE_NAME) == 0) {
205 while (count-- > 0) {
206 if (!check_driver_loaded())
218 int ensure_config_file_exists()
224 if (access(SUPP_CONFIG_FILE, R_OK|W_OK) == 0) {
226 } else if (errno != ENOENT) {
227 LOGE("Cannot access \"%s\": %s", SUPP_CONFIG_FILE, strerror(errno));
231 srcfd = open(SUPP_CONFIG_TEMPLATE, O_RDONLY);
233 LOGE("Cannot open \"%s\": %s", SUPP_CONFIG_TEMPLATE, strerror(errno));
237 destfd = open(SUPP_CONFIG_FILE, O_CREAT|O_WRONLY, 0660);
240 LOGE("Cannot create \"%s\": %s", SUPP_CONFIG_FILE, strerror(errno));
244 while ((nread = read(srcfd, buf, sizeof(buf))) != 0) {
246 LOGE("Error reading \"%s\": %s", SUPP_CONFIG_TEMPLATE, strerror(errno));
249 unlink(SUPP_CONFIG_FILE);
252 write(destfd, buf, nread);
258 if (chown(SUPP_CONFIG_FILE, AID_SYSTEM, AID_WIFI) < 0) {
259 LOGE("Error changing group ownership of %s to %d: %s",
260 SUPP_CONFIG_FILE, AID_WIFI, strerror(errno));
261 unlink(SUPP_CONFIG_FILE);
267 int wifi_start_supplicant()
269 char supp_status[PROPERTY_VALUE_MAX] = {'\0'};
270 int count = 200; /* wait at most 20 seconds for completion */
271 #ifdef HAVE_LIBC_SYSTEM_PROPERTIES
276 /* Check whether already running */
277 if (property_get(SUPP_PROP_NAME, supp_status, NULL)
278 && strcmp(supp_status, "running") == 0) {
282 /* Before starting the daemon, make sure its config file exists */
283 if (ensure_config_file_exists() < 0) {
284 LOGE("Wi-Fi will not be enabled");
288 /* Clear out any stale socket files that might be left over. */
291 #ifdef HAVE_LIBC_SYSTEM_PROPERTIES
293 * Get a reference to the status property, so we can distinguish
294 * the case where it goes stopped => running => stopped (i.e.,
295 * it start up, but fails right away) from the case in which
296 * it starts in the stopped state and never manages to start
299 pi = __system_property_find(SUPP_PROP_NAME);
304 property_set("ctl.start", SUPPLICANT_NAME);
307 while (count-- > 0) {
308 #ifdef HAVE_LIBC_SYSTEM_PROPERTIES
310 pi = __system_property_find(SUPP_PROP_NAME);
313 __system_property_read(pi, NULL, supp_status);
314 if (strcmp(supp_status, "running") == 0) {
316 } else if (pi->serial != serial &&
317 strcmp(supp_status, "stopped") == 0) {
322 if (property_get(SUPP_PROP_NAME, supp_status, NULL)) {
323 if (strcmp(supp_status, "running") == 0)
332 int wifi_stop_supplicant()
334 char supp_status[PROPERTY_VALUE_MAX] = {'\0'};
335 int count = 50; /* wait at most 5 seconds for completion */
337 /* Check whether supplicant already stopped */
338 if (property_get(SUPP_PROP_NAME, supp_status, NULL)
339 && strcmp(supp_status, "stopped") == 0) {
343 property_set("ctl.stop", SUPPLICANT_NAME);
346 while (count-- > 0) {
347 if (property_get(SUPP_PROP_NAME, supp_status, NULL)) {
348 if (strcmp(supp_status, "stopped") == 0)
356 int wifi_connect_to_supplicant()
359 char supp_status[PROPERTY_VALUE_MAX] = {'\0'};
361 /* Make sure supplicant is running */
362 if (!property_get(SUPP_PROP_NAME, supp_status, NULL)
363 || strcmp(supp_status, "running") != 0) {
364 LOGE("Supplicant not running, cannot connect");
368 property_get("wifi.interface", iface, WIFI_TEST_INTERFACE);
370 if (access(IFACE_DIR, F_OK) == 0) {
371 snprintf(ifname, sizeof(ifname), "%s/%s", IFACE_DIR, iface);
373 strlcpy(ifname, iface, sizeof(ifname));
376 ctrl_conn = wpa_ctrl_open(ifname);
377 if (ctrl_conn == NULL) {
378 LOGE("Unable to open connection to supplicant on \"%s\": %s",
379 ifname, strerror(errno));
382 monitor_conn = wpa_ctrl_open(ifname);
383 if (monitor_conn == NULL) {
384 wpa_ctrl_close(ctrl_conn);
388 if (wpa_ctrl_attach(monitor_conn) != 0) {
389 wpa_ctrl_close(monitor_conn);
390 wpa_ctrl_close(ctrl_conn);
391 ctrl_conn = monitor_conn = NULL;
397 int wifi_send_command(struct wpa_ctrl *ctrl, const char *cmd, char *reply, size_t *reply_len)
401 if (ctrl_conn == NULL) {
402 LOGV("Not connected to wpa_supplicant - \"%s\" command dropped.\n", cmd);
405 ret = wpa_ctrl_request(ctrl, cmd, strlen(cmd), reply, reply_len, NULL);
407 LOGD("'%s' command timed out.\n", cmd);
409 } else if (ret < 0 || strncmp(reply, "FAIL", 4) == 0) {
412 if (strncmp(cmd, "PING", 4) == 0) {
413 reply[*reply_len] = '\0';
418 int wifi_wait_for_event(char *buf, size_t buflen)
420 size_t nread = buflen - 1;
425 struct timeval *tptr;
427 if (monitor_conn == NULL)
430 result = wpa_ctrl_recv(monitor_conn, buf, &nread);
432 LOGD("wpa_ctrl_recv failed: %s\n", strerror(errno));
436 /* LOGD("wait_for_event: result=%d nread=%d string=\"%s\"\n", result, nread, buf); */
437 /* Check for EOF on the socket */
438 if (result == 0 && nread == 0) {
439 /* Fabricate an event to pass up */
440 LOGD("Received EOF on supplicant socket\n");
441 strncpy(buf, WPA_EVENT_TERMINATING " - signal 0 received", buflen-1);
442 buf[buflen-1] = '\0';
446 * Events strings are in the format
450 * where N is the message level in numerical form (0=VERBOSE, 1=DEBUG,
451 * etc.) and XXX is the event name. The level information is not useful
452 * to us, so strip it off.
455 char *match = strchr(buf, '>');
457 nread -= (match+1-buf);
458 memmove(buf, match+1, nread+1);
464 void wifi_close_supplicant_connection()
466 if (ctrl_conn != NULL) {
467 wpa_ctrl_close(ctrl_conn);
470 if (monitor_conn != NULL) {
471 wpa_ctrl_close(monitor_conn);
476 int wifi_command(const char *command, char *reply, size_t *reply_len)
478 return wifi_send_command(ctrl_conn, command, reply, reply_len);