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) {
192 wifi_unload_driver();
198 property_set(DRIVER_PROP_NAME, "timeout");
199 wifi_unload_driver();
203 int wifi_unload_driver()
205 int count = 20; /* wait at most 10 seconds for completion */
207 if (rmmod(DRIVER_MODULE_NAME) == 0) {
208 while (count-- > 0) {
209 if (!check_driver_loaded())
221 int ensure_config_file_exists()
227 if (access(SUPP_CONFIG_FILE, R_OK|W_OK) == 0) {
229 } else if (errno != ENOENT) {
230 LOGE("Cannot access \"%s\": %s", SUPP_CONFIG_FILE, strerror(errno));
234 srcfd = open(SUPP_CONFIG_TEMPLATE, O_RDONLY);
236 LOGE("Cannot open \"%s\": %s", SUPP_CONFIG_TEMPLATE, strerror(errno));
240 destfd = open(SUPP_CONFIG_FILE, O_CREAT|O_WRONLY, 0660);
243 LOGE("Cannot create \"%s\": %s", SUPP_CONFIG_FILE, strerror(errno));
247 while ((nread = read(srcfd, buf, sizeof(buf))) != 0) {
249 LOGE("Error reading \"%s\": %s", SUPP_CONFIG_TEMPLATE, strerror(errno));
252 unlink(SUPP_CONFIG_FILE);
255 write(destfd, buf, nread);
261 if (chown(SUPP_CONFIG_FILE, AID_SYSTEM, AID_WIFI) < 0) {
262 LOGE("Error changing group ownership of %s to %d: %s",
263 SUPP_CONFIG_FILE, AID_WIFI, strerror(errno));
264 unlink(SUPP_CONFIG_FILE);
270 int wifi_start_supplicant()
272 char supp_status[PROPERTY_VALUE_MAX] = {'\0'};
273 int count = 200; /* wait at most 20 seconds for completion */
274 #ifdef HAVE_LIBC_SYSTEM_PROPERTIES
279 /* Check whether already running */
280 if (property_get(SUPP_PROP_NAME, supp_status, NULL)
281 && strcmp(supp_status, "running") == 0) {
285 /* Before starting the daemon, make sure its config file exists */
286 if (ensure_config_file_exists() < 0) {
287 LOGE("Wi-Fi will not be enabled");
291 /* Clear out any stale socket files that might be left over. */
294 #ifdef HAVE_LIBC_SYSTEM_PROPERTIES
296 * Get a reference to the status property, so we can distinguish
297 * the case where it goes stopped => running => stopped (i.e.,
298 * it start up, but fails right away) from the case in which
299 * it starts in the stopped state and never manages to start
302 pi = __system_property_find(SUPP_PROP_NAME);
307 property_set("ctl.start", SUPPLICANT_NAME);
310 while (count-- > 0) {
311 #ifdef HAVE_LIBC_SYSTEM_PROPERTIES
313 pi = __system_property_find(SUPP_PROP_NAME);
316 __system_property_read(pi, NULL, supp_status);
317 if (strcmp(supp_status, "running") == 0) {
319 } else if (pi->serial != serial &&
320 strcmp(supp_status, "stopped") == 0) {
325 if (property_get(SUPP_PROP_NAME, supp_status, NULL)) {
326 if (strcmp(supp_status, "running") == 0)
335 int wifi_stop_supplicant()
337 char supp_status[PROPERTY_VALUE_MAX] = {'\0'};
338 int count = 50; /* wait at most 5 seconds for completion */
340 /* Check whether supplicant already stopped */
341 if (property_get(SUPP_PROP_NAME, supp_status, NULL)
342 && strcmp(supp_status, "stopped") == 0) {
346 property_set("ctl.stop", SUPPLICANT_NAME);
349 while (count-- > 0) {
350 if (property_get(SUPP_PROP_NAME, supp_status, NULL)) {
351 if (strcmp(supp_status, "stopped") == 0)
359 int wifi_connect_to_supplicant()
362 char supp_status[PROPERTY_VALUE_MAX] = {'\0'};
364 /* Make sure supplicant is running */
365 if (!property_get(SUPP_PROP_NAME, supp_status, NULL)
366 || strcmp(supp_status, "running") != 0) {
367 LOGE("Supplicant not running, cannot connect");
371 property_get("wifi.interface", iface, WIFI_TEST_INTERFACE);
373 if (access(IFACE_DIR, F_OK) == 0) {
374 snprintf(ifname, sizeof(ifname), "%s/%s", IFACE_DIR, iface);
376 strlcpy(ifname, iface, sizeof(ifname));
379 ctrl_conn = wpa_ctrl_open(ifname);
380 if (ctrl_conn == NULL) {
381 LOGE("Unable to open connection to supplicant on \"%s\": %s",
382 ifname, strerror(errno));
385 monitor_conn = wpa_ctrl_open(ifname);
386 if (monitor_conn == NULL) {
387 wpa_ctrl_close(ctrl_conn);
391 if (wpa_ctrl_attach(monitor_conn) != 0) {
392 wpa_ctrl_close(monitor_conn);
393 wpa_ctrl_close(ctrl_conn);
394 ctrl_conn = monitor_conn = NULL;
400 int wifi_send_command(struct wpa_ctrl *ctrl, const char *cmd, char *reply, size_t *reply_len)
404 if (ctrl_conn == NULL) {
405 LOGV("Not connected to wpa_supplicant - \"%s\" command dropped.\n", cmd);
408 ret = wpa_ctrl_request(ctrl, cmd, strlen(cmd), reply, reply_len, NULL);
410 LOGD("'%s' command timed out.\n", cmd);
412 } else if (ret < 0 || strncmp(reply, "FAIL", 4) == 0) {
415 if (strncmp(cmd, "PING", 4) == 0) {
416 reply[*reply_len] = '\0';
421 int wifi_wait_for_event(char *buf, size_t buflen)
423 size_t nread = buflen - 1;
428 struct timeval *tptr;
430 if (monitor_conn == NULL) {
431 LOGD("Connection closed\n");
432 strncpy(buf, WPA_EVENT_TERMINATING " - connection closed", buflen-1);
433 buf[buflen-1] = '\0';
437 result = wpa_ctrl_recv(monitor_conn, buf, &nread);
439 LOGD("wpa_ctrl_recv failed: %s\n", strerror(errno));
440 strncpy(buf, WPA_EVENT_TERMINATING " - recv error", buflen-1);
441 buf[buflen-1] = '\0';
445 /* LOGD("wait_for_event: result=%d nread=%d string=\"%s\"\n", result, nread, buf); */
446 /* Check for EOF on the socket */
447 if (result == 0 && nread == 0) {
448 /* Fabricate an event to pass up */
449 LOGD("Received EOF on supplicant socket\n");
450 strncpy(buf, WPA_EVENT_TERMINATING " - signal 0 received", buflen-1);
451 buf[buflen-1] = '\0';
455 * Events strings are in the format
459 * where N is the message level in numerical form (0=VERBOSE, 1=DEBUG,
460 * etc.) and XXX is the event name. The level information is not useful
461 * to us, so strip it off.
464 char *match = strchr(buf, '>');
466 nread -= (match+1-buf);
467 memmove(buf, match+1, nread+1);
473 void wifi_close_supplicant_connection()
475 if (ctrl_conn != NULL) {
476 wpa_ctrl_close(ctrl_conn);
479 if (monitor_conn != NULL) {
480 wpa_ctrl_close(monitor_conn);
485 int wifi_command(const char *command, char *reply, size_t *reply_len)
487 return wifi_send_command(ctrl_conn, command, reply, reply_len);