1 /*
2 * Copyright 2008, The Android Open Source Project
3 *
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
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
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.
15 */
16
17 #include <stdlib.h>
18 #include <fcntl.h>
19 #include <errno.h>
20 #include <string.h>
21
22 #include "hardware_legacy/wifi.h"
23 #include "libwpa_client/wpa_ctrl.h"
24
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>
34 #endif
35
36 static struct wpa_ctrl *ctrl_conn;
37 static struct wpa_ctrl *monitor_conn;
38
39 extern int do_dhcp();
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);
46
47 static char iface[PROPERTY_VALUE_MAX];
48 // TODO: use new ANDROID_SOCKET mechanism, once support for multiple
49 // sockets is in
50
51 #ifndef WIFI_DRIVER_MODULE_PATH
52 #define WIFI_DRIVER_MODULE_PATH "/system/lib/modules/wlan.ko"
53 #endif
54 #ifndef WIFI_DRIVER_MODULE_NAME
55 #define WIFI_DRIVER_MODULE_NAME "wlan"
56 #endif
57 #ifndef WIFI_DRIVER_MODULE_ARG
58 #define WIFI_DRIVER_MODULE_ARG ""
59 #endif
60 #ifndef WIFI_FIRMWARE_LOADER
61 #define WIFI_FIRMWARE_LOADER ""
62 #endif
63 #define WIFI_TEST_INTERFACE "sta"
64
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";
77
insmod(const char * filename,const char * args)78 static int insmod(const char *filename, const char *args)
79 {
80 void *module;
81 unsigned int size;
82 int ret;
83
84 module = load_file(filename, &size);
85 if (!module)
86 return -1;
87
88 ret = init_module(module, size, args);
89
90 free(module);
91
92 return ret;
93 }
94
rmmod(const char * modname)95 static int rmmod(const char *modname)
96 {
97 int ret = -1;
98 int maxtry = 10;
99
100 while (maxtry-- > 0) {
101 ret = delete_module(modname, O_NONBLOCK | O_EXCL);
102 if (ret < 0 && errno == EAGAIN)
103 usleep(500000);
104 else
105 break;
106 }
107
108 if (ret != 0)
109 LOGD("Unable to unload driver module \"%s\": %s\n",
110 modname, strerror(errno));
111 return ret;
112 }
113
do_dhcp_request(int * ipaddr,int * gateway,int * mask,int * dns1,int * dns2,int * server,int * lease)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)
118 return 0;
119
120 if (ifc_init() < 0)
121 return -1;
122
123 if (do_dhcp(iface) < 0) {
124 ifc_close();
125 return -1;
126 }
127 ifc_close();
128 get_dhcp_info(ipaddr, gateway, mask, dns1, dns2, server, lease);
129 return 0;
130 }
131
get_dhcp_error_string()132 const char *get_dhcp_error_string() {
133 return dhcp_lasterror();
134 }
135
check_driver_loaded()136 static int check_driver_loaded() {
137 char driver_status[PROPERTY_VALUE_MAX];
138 FILE *proc;
139 char line[sizeof(DRIVER_MODULE_TAG)+10];
140
141 if (!property_get(DRIVER_PROP_NAME, driver_status, NULL)
142 || strcmp(driver_status, "ok") != 0) {
143 return 0; /* driver not loaded */
144 }
145 /*
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
149 * crash.
150 */
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");
154 return 0;
155 }
156 while ((fgets(line, sizeof(line), proc)) != NULL) {
157 if (strncmp(line, DRIVER_MODULE_TAG, strlen(DRIVER_MODULE_TAG)) == 0) {
158 fclose(proc);
159 return 1;
160 }
161 }
162 fclose(proc);
163 property_set(DRIVER_PROP_NAME, "unloaded");
164 return 0;
165 }
166
wifi_load_driver()167 int wifi_load_driver()
168 {
169 char driver_status[PROPERTY_VALUE_MAX];
170 int count = 100; /* wait at most 20 seconds for completion */
171
172 if (check_driver_loaded()) {
173 return 0;
174 }
175
176 if (insmod(DRIVER_MODULE_PATH, DRIVER_MODULE_ARG) < 0)
177 return -1;
178
179 if (strcmp(FIRMWARE_LOADER,"") == 0) {
180 usleep(500000);
181 property_set(DRIVER_PROP_NAME, "ok");
182 }
183 else {
184 property_set("ctl.start", FIRMWARE_LOADER);
185 }
186 sched_yield();
187 while (count-- > 0) {
188 if (property_get(DRIVER_PROP_NAME, driver_status, NULL)) {
189 if (strcmp(driver_status, "ok") == 0)
190 return 0;
191 else if (strcmp(DRIVER_PROP_NAME, "failed") == 0)
192 return -1;
193 }
194 usleep(200000);
195 }
196 property_set(DRIVER_PROP_NAME, "timeout");
197 return -1;
198 }
199
wifi_unload_driver()200 int wifi_unload_driver()
201 {
202 int count = 20; /* wait at most 10 seconds for completion */
203
204 if (rmmod(DRIVER_MODULE_NAME) == 0) {
205 while (count-- > 0) {
206 if (!check_driver_loaded())
207 break;
208 usleep(500000);
209 }
210 if (count) {
211 return 0;
212 }
213 return -1;
214 } else
215 return -1;
216 }
217
ensure_config_file_exists()218 int ensure_config_file_exists()
219 {
220 char buf[2048];
221 int srcfd, destfd;
222 int nread;
223
224 if (access(SUPP_CONFIG_FILE, R_OK|W_OK) == 0) {
225 return 0;
226 } else if (errno != ENOENT) {
227 LOGE("Cannot access \"%s\": %s", SUPP_CONFIG_FILE, strerror(errno));
228 return -1;
229 }
230
231 srcfd = open(SUPP_CONFIG_TEMPLATE, O_RDONLY);
232 if (srcfd < 0) {
233 LOGE("Cannot open \"%s\": %s", SUPP_CONFIG_TEMPLATE, strerror(errno));
234 return -1;
235 }
236
237 destfd = open(SUPP_CONFIG_FILE, O_CREAT|O_WRONLY, 0660);
238 if (destfd < 0) {
239 close(srcfd);
240 LOGE("Cannot create \"%s\": %s", SUPP_CONFIG_FILE, strerror(errno));
241 return -1;
242 }
243
244 while ((nread = read(srcfd, buf, sizeof(buf))) != 0) {
245 if (nread < 0) {
246 LOGE("Error reading \"%s\": %s", SUPP_CONFIG_TEMPLATE, strerror(errno));
247 close(srcfd);
248 close(destfd);
249 unlink(SUPP_CONFIG_FILE);
250 return -1;
251 }
252 write(destfd, buf, nread);
253 }
254
255 close(destfd);
256 close(srcfd);
257
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);
262 return -1;
263 }
264 return 0;
265 }
266
wifi_start_supplicant()267 int wifi_start_supplicant()
268 {
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
272 const prop_info *pi;
273 unsigned serial = 0;
274 #endif
275
276 /* Check whether already running */
277 if (property_get(SUPP_PROP_NAME, supp_status, NULL)
278 && strcmp(supp_status, "running") == 0) {
279 return 0;
280 }
281
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");
285 return -1;
286 }
287
288 /* Clear out any stale socket files that might be left over. */
289 wpa_ctrl_cleanup();
290
291 #ifdef HAVE_LIBC_SYSTEM_PROPERTIES
292 /*
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
297 * running at all.
298 */
299 pi = __system_property_find(SUPP_PROP_NAME);
300 if (pi != NULL) {
301 serial = pi->serial;
302 }
303 #endif
304 property_set("ctl.start", SUPPLICANT_NAME);
305 sched_yield();
306
307 while (count-- > 0) {
308 #ifdef HAVE_LIBC_SYSTEM_PROPERTIES
309 if (pi == NULL) {
310 pi = __system_property_find(SUPP_PROP_NAME);
311 }
312 if (pi != NULL) {
313 __system_property_read(pi, NULL, supp_status);
314 if (strcmp(supp_status, "running") == 0) {
315 return 0;
316 } else if (pi->serial != serial &&
317 strcmp(supp_status, "stopped") == 0) {
318 return -1;
319 }
320 }
321 #else
322 if (property_get(SUPP_PROP_NAME, supp_status, NULL)) {
323 if (strcmp(supp_status, "running") == 0)
324 return 0;
325 }
326 #endif
327 usleep(100000);
328 }
329 return -1;
330 }
331
wifi_stop_supplicant()332 int wifi_stop_supplicant()
333 {
334 char supp_status[PROPERTY_VALUE_MAX] = {'\0'};
335 int count = 50; /* wait at most 5 seconds for completion */
336
337 /* Check whether supplicant already stopped */
338 if (property_get(SUPP_PROP_NAME, supp_status, NULL)
339 && strcmp(supp_status, "stopped") == 0) {
340 return 0;
341 }
342
343 property_set("ctl.stop", SUPPLICANT_NAME);
344 sched_yield();
345
346 while (count-- > 0) {
347 if (property_get(SUPP_PROP_NAME, supp_status, NULL)) {
348 if (strcmp(supp_status, "stopped") == 0)
349 return 0;
350 }
351 usleep(100000);
352 }
353 return -1;
354 }
355
wifi_connect_to_supplicant()356 int wifi_connect_to_supplicant()
357 {
358 char ifname[256];
359 char supp_status[PROPERTY_VALUE_MAX] = {'\0'};
360
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");
365 return -1;
366 }
367
368 property_get("wifi.interface", iface, WIFI_TEST_INTERFACE);
369
370 if (access(IFACE_DIR, F_OK) == 0) {
371 snprintf(ifname, sizeof(ifname), "%s/%s", IFACE_DIR, iface);
372 } else {
373 strlcpy(ifname, iface, sizeof(ifname));
374 }
375
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));
380 return -1;
381 }
382 monitor_conn = wpa_ctrl_open(ifname);
383 if (monitor_conn == NULL) {
384 wpa_ctrl_close(ctrl_conn);
385 ctrl_conn = NULL;
386 return -1;
387 }
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;
392 return -1;
393 }
394 return 0;
395 }
396
wifi_send_command(struct wpa_ctrl * ctrl,const char * cmd,char * reply,size_t * reply_len)397 int wifi_send_command(struct wpa_ctrl *ctrl, const char *cmd, char *reply, size_t *reply_len)
398 {
399 int ret;
400
401 if (ctrl_conn == NULL) {
402 LOGV("Not connected to wpa_supplicant - \"%s\" command dropped.\n", cmd);
403 return -1;
404 }
405 ret = wpa_ctrl_request(ctrl, cmd, strlen(cmd), reply, reply_len, NULL);
406 if (ret == -2) {
407 LOGD("'%s' command timed out.\n", cmd);
408 return -2;
409 } else if (ret < 0 || strncmp(reply, "FAIL", 4) == 0) {
410 return -1;
411 }
412 if (strncmp(cmd, "PING", 4) == 0) {
413 reply[*reply_len] = '\0';
414 }
415 return 0;
416 }
417
wifi_wait_for_event(char * buf,size_t buflen)418 int wifi_wait_for_event(char *buf, size_t buflen)
419 {
420 size_t nread = buflen - 1;
421 int fd;
422 fd_set rfds;
423 int result;
424 struct timeval tval;
425 struct timeval *tptr;
426
427 if (monitor_conn == NULL)
428 return 0;
429
430 result = wpa_ctrl_recv(monitor_conn, buf, &nread);
431 if (result < 0) {
432 LOGD("wpa_ctrl_recv failed: %s\n", strerror(errno));
433 return -1;
434 }
435 buf[nread] = '\0';
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';
443 return strlen(buf);
444 }
445 /*
446 * Events strings are in the format
447 *
448 * <N>CTRL-EVENT-XXX
449 *
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.
453 */
454 if (buf[0] == '<') {
455 char *match = strchr(buf, '>');
456 if (match != NULL) {
457 nread -= (match+1-buf);
458 memmove(buf, match+1, nread+1);
459 }
460 }
461 return nread;
462 }
463
wifi_close_supplicant_connection()464 void wifi_close_supplicant_connection()
465 {
466 if (ctrl_conn != NULL) {
467 wpa_ctrl_close(ctrl_conn);
468 ctrl_conn = NULL;
469 }
470 if (monitor_conn != NULL) {
471 wpa_ctrl_close(monitor_conn);
472 monitor_conn = NULL;
473 }
474 }
475
wifi_command(const char * command,char * reply,size_t * reply_len)476 int wifi_command(const char *command, char *reply, size_t *reply_len)
477 {
478 return wifi_send_command(ctrl_conn, command, reply, reply_len);
479 }
480