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 #include <dirent.h> 22 #include <sys/socket.h> 23 #include <unistd.h> 24 #include <poll.h> 25 26 #include "hardware_legacy/wifi.h" 27 #include "libwpa_client/wpa_ctrl.h" 28 29 #define LOG_TAG "WifiHW" 30 #include "cutils/log.h" 31 #include "cutils/memory.h" 32 #include "cutils/misc.h" 33 #include "cutils/properties.h" 34 #include "private/android_filesystem_config.h" 35 #ifdef HAVE_LIBC_SYSTEM_PROPERTIES 36 #define _REALLY_INCLUDE_SYS__SYSTEM_PROPERTIES_H_ 37 #include <sys/_system_properties.h> 38 #endif 39 40 /* PRIMARY refers to the connection on the primary interface 41 * SECONDARY refers to an optional connection on a p2p interface 42 * 43 * For concurrency, we only support one active p2p connection and 44 * one active STA connection at a time 45 */ 46 #define PRIMARY 0 47 #define SECONDARY 1 48 #define MAX_CONNS 2 49 50 static struct wpa_ctrl *ctrl_conn[MAX_CONNS]; 51 static struct wpa_ctrl *monitor_conn[MAX_CONNS]; 52 53 /* socket pair used to exit from a blocking read */ 54 static int exit_sockets[MAX_CONNS][2]; 55 56 extern int do_dhcp(); 57 extern int ifc_init(); 58 extern void ifc_close(); 59 extern char *dhcp_lasterror(); 60 extern void get_dhcp_info(); 61 extern int init_module(void *, unsigned long, const char *); 62 extern int delete_module(const char *, unsigned int); 63 64 static char primary_iface[PROPERTY_VALUE_MAX]; 65 // TODO: use new ANDROID_SOCKET mechanism, once support for multiple 66 // sockets is in 67 68 #ifndef WIFI_DRIVER_MODULE_ARG 69 #define WIFI_DRIVER_MODULE_ARG "" 70 #endif 71 #ifndef WIFI_FIRMWARE_LOADER 72 #define WIFI_FIRMWARE_LOADER "" 73 #endif 74 #define WIFI_TEST_INTERFACE "sta" 75 76 #ifndef WIFI_DRIVER_FW_PATH_STA 77 #define WIFI_DRIVER_FW_PATH_STA NULL 78 #endif 79 #ifndef WIFI_DRIVER_FW_PATH_AP 80 #define WIFI_DRIVER_FW_PATH_AP NULL 81 #endif 82 #ifndef WIFI_DRIVER_FW_PATH_P2P 83 #define WIFI_DRIVER_FW_PATH_P2P NULL 84 #endif 85 86 #ifndef WIFI_DRIVER_FW_PATH_PARAM 87 #define WIFI_DRIVER_FW_PATH_PARAM "/sys/module/wlan/parameters/fwpath" 88 #endif 89 90 #define WIFI_DRIVER_LOADER_DELAY 1000000 91 92 static const char IFACE_DIR[] = "/data/system/wpa_supplicant"; 93 #ifdef WIFI_DRIVER_MODULE_PATH 94 static const char DRIVER_MODULE_NAME[] = WIFI_DRIVER_MODULE_NAME; 95 static const char DRIVER_MODULE_TAG[] = WIFI_DRIVER_MODULE_NAME " "; 96 static const char DRIVER_MODULE_PATH[] = WIFI_DRIVER_MODULE_PATH; 97 static const char DRIVER_MODULE_ARG[] = WIFI_DRIVER_MODULE_ARG; 98 #endif 99 static const char FIRMWARE_LOADER[] = WIFI_FIRMWARE_LOADER; 100 static const char DRIVER_PROP_NAME[] = "wlan.driver.status"; 101 static const char SUPPLICANT_NAME[] = "wpa_supplicant"; 102 static const char SUPP_PROP_NAME[] = "init.svc.wpa_supplicant"; 103 static const char P2P_SUPPLICANT_NAME[] = "p2p_supplicant"; 104 static const char P2P_PROP_NAME[] = "init.svc.p2p_supplicant"; 105 static const char SUPP_CONFIG_TEMPLATE[]= "/system/etc/wifi/wpa_supplicant.conf"; 106 static const char SUPP_CONFIG_FILE[] = "/data/misc/wifi/wpa_supplicant.conf"; 107 static const char P2P_CONFIG_FILE[] = "/data/misc/wifi/p2p_supplicant.conf"; 108 static const char CONTROL_IFACE_PATH[] = "/data/misc/wifi/sockets"; 109 static const char MODULE_FILE[] = "/proc/modules"; 110 111 static const char SUPP_ENTROPY_FILE[] = WIFI_ENTROPY_FILE; 112 static unsigned char dummy_key[21] = { 0x02, 0x11, 0xbe, 0x33, 0x43, 0x35, 113 0x68, 0x47, 0x84, 0x99, 0xa9, 0x2b, 114 0x1c, 0xd3, 0xee, 0xff, 0xf1, 0xe2, 115 0xf3, 0xf4, 0xf5 }; 116 117 /* Is either SUPPLICANT_NAME or P2P_SUPPLICANT_NAME */ 118 static char supplicant_name[PROPERTY_VALUE_MAX]; 119 /* Is either SUPP_PROP_NAME or P2P_PROP_NAME */ 120 static char supplicant_prop_name[PROPERTY_KEY_MAX]; 121 122 static int is_primary_interface(const char *ifname) 123 { 124 //Treat NULL as primary interface to allow control 125 //on STA without an interface 126 if (ifname == NULL || !strncmp(ifname, primary_iface, strlen(primary_iface))) { 127 return 1; 128 } 129 return 0; 130 } 131 132 static int insmod(const char *filename, const char *args) 133 { 134 void *module; 135 unsigned int size; 136 int ret; 137 138 module = load_file(filename, &size); 139 if (!module) 140 return -1; 141 142 ret = init_module(module, size, args); 143 144 free(module); 145 146 return ret; 147 } 148 149 static int rmmod(const char *modname) 150 { 151 int ret = -1; 152 int maxtry = 10; 153 154 while (maxtry-- > 0) { 155 ret = delete_module(modname, O_NONBLOCK | O_EXCL); 156 if (ret < 0 && errno == EAGAIN) 157 usleep(500000); 158 else 159 break; 160 } 161 162 if (ret != 0) 163 ALOGD("Unable to unload driver module \"%s\": %s\n", 164 modname, strerror(errno)); 165 return ret; 166 } 167 168 int do_dhcp_request(int *ipaddr, int *gateway, int *mask, 169 int *dns1, int *dns2, int *server, int *lease) { 170 /* For test driver, always report success */ 171 if (strcmp(primary_iface, WIFI_TEST_INTERFACE) == 0) 172 return 0; 173 174 if (ifc_init() < 0) 175 return -1; 176 177 if (do_dhcp(primary_iface) < 0) { 178 ifc_close(); 179 return -1; 180 } 181 ifc_close(); 182 get_dhcp_info(ipaddr, gateway, mask, dns1, dns2, server, lease); 183 return 0; 184 } 185 186 const char *get_dhcp_error_string() { 187 return dhcp_lasterror(); 188 } 189 190 int is_wifi_driver_loaded() { 191 char driver_status[PROPERTY_VALUE_MAX]; 192 #ifdef WIFI_DRIVER_MODULE_PATH 193 FILE *proc; 194 char line[sizeof(DRIVER_MODULE_TAG)+10]; 195 #endif 196 197 if (!property_get(DRIVER_PROP_NAME, driver_status, NULL) 198 || strcmp(driver_status, "ok") != 0) { 199 return 0; /* driver not loaded */ 200 } 201 #ifdef WIFI_DRIVER_MODULE_PATH 202 /* 203 * If the property says the driver is loaded, check to 204 * make sure that the property setting isn't just left 205 * over from a previous manual shutdown or a runtime 206 * crash. 207 */ 208 if ((proc = fopen(MODULE_FILE, "r")) == NULL) { 209 ALOGW("Could not open %s: %s", MODULE_FILE, strerror(errno)); 210 property_set(DRIVER_PROP_NAME, "unloaded"); 211 return 0; 212 } 213 while ((fgets(line, sizeof(line), proc)) != NULL) { 214 if (strncmp(line, DRIVER_MODULE_TAG, strlen(DRIVER_MODULE_TAG)) == 0) { 215 fclose(proc); 216 return 1; 217 } 218 } 219 fclose(proc); 220 property_set(DRIVER_PROP_NAME, "unloaded"); 221 return 0; 222 #else 223 return 1; 224 #endif 225 } 226 227 int wifi_load_driver() 228 { 229 #ifdef WIFI_DRIVER_MODULE_PATH 230 char driver_status[PROPERTY_VALUE_MAX]; 231 int count = 100; /* wait at most 20 seconds for completion */ 232 233 if (is_wifi_driver_loaded()) { 234 return 0; 235 } 236 237 if (insmod(DRIVER_MODULE_PATH, DRIVER_MODULE_ARG) < 0) 238 return -1; 239 240 if (strcmp(FIRMWARE_LOADER,"") == 0) { 241 /* usleep(WIFI_DRIVER_LOADER_DELAY); */ 242 property_set(DRIVER_PROP_NAME, "ok"); 243 } 244 else { 245 property_set("ctl.start", FIRMWARE_LOADER); 246 } 247 sched_yield(); 248 while (count-- > 0) { 249 if (property_get(DRIVER_PROP_NAME, driver_status, NULL)) { 250 if (strcmp(driver_status, "ok") == 0) 251 return 0; 252 else if (strcmp(DRIVER_PROP_NAME, "failed") == 0) { 253 wifi_unload_driver(); 254 return -1; 255 } 256 } 257 usleep(200000); 258 } 259 property_set(DRIVER_PROP_NAME, "timeout"); 260 wifi_unload_driver(); 261 return -1; 262 #else 263 property_set(DRIVER_PROP_NAME, "ok"); 264 return 0; 265 #endif 266 } 267 268 int wifi_unload_driver() 269 { 270 usleep(200000); /* allow to finish interface down */ 271 #ifdef WIFI_DRIVER_MODULE_PATH 272 if (rmmod(DRIVER_MODULE_NAME) == 0) { 273 int count = 20; /* wait at most 10 seconds for completion */ 274 while (count-- > 0) { 275 if (!is_wifi_driver_loaded()) 276 break; 277 usleep(500000); 278 } 279 usleep(500000); /* allow card removal */ 280 if (count) { 281 return 0; 282 } 283 return -1; 284 } else 285 return -1; 286 #else 287 property_set(DRIVER_PROP_NAME, "unloaded"); 288 return 0; 289 #endif 290 } 291 292 int ensure_entropy_file_exists() 293 { 294 int ret; 295 int destfd; 296 297 ret = access(SUPP_ENTROPY_FILE, R_OK|W_OK); 298 if ((ret == 0) || (errno == EACCES)) { 299 if ((ret != 0) && 300 (chmod(SUPP_ENTROPY_FILE, S_IRUSR|S_IWUSR|S_IRGRP|S_IWGRP) != 0)) { 301 ALOGE("Cannot set RW to \"%s\": %s", SUPP_ENTROPY_FILE, strerror(errno)); 302 return -1; 303 } 304 return 0; 305 } 306 destfd = TEMP_FAILURE_RETRY(open(SUPP_ENTROPY_FILE, O_CREAT|O_RDWR, 0660)); 307 if (destfd < 0) { 308 ALOGE("Cannot create \"%s\": %s", SUPP_ENTROPY_FILE, strerror(errno)); 309 return -1; 310 } 311 312 if (TEMP_FAILURE_RETRY(write(destfd, dummy_key, sizeof(dummy_key))) != sizeof(dummy_key)) { 313 ALOGE("Error writing \"%s\": %s", SUPP_ENTROPY_FILE, strerror(errno)); 314 close(destfd); 315 return -1; 316 } 317 close(destfd); 318 319 /* chmod is needed because open() didn't set permisions properly */ 320 if (chmod(SUPP_ENTROPY_FILE, 0660) < 0) { 321 ALOGE("Error changing permissions of %s to 0660: %s", 322 SUPP_ENTROPY_FILE, strerror(errno)); 323 unlink(SUPP_ENTROPY_FILE); 324 return -1; 325 } 326 327 if (chown(SUPP_ENTROPY_FILE, AID_SYSTEM, AID_WIFI) < 0) { 328 ALOGE("Error changing group ownership of %s to %d: %s", 329 SUPP_ENTROPY_FILE, AID_WIFI, strerror(errno)); 330 unlink(SUPP_ENTROPY_FILE); 331 return -1; 332 } 333 return 0; 334 } 335 336 int update_ctrl_interface(const char *config_file) { 337 338 int srcfd, destfd; 339 int nread; 340 char ifc[PROPERTY_VALUE_MAX]; 341 char *pbuf; 342 char *sptr; 343 struct stat sb; 344 345 if (stat(config_file, &sb) != 0) 346 return -1; 347 348 pbuf = malloc(sb.st_size + PROPERTY_VALUE_MAX); 349 if (!pbuf) 350 return 0; 351 srcfd = TEMP_FAILURE_RETRY(open(config_file, O_RDONLY)); 352 if (srcfd < 0) { 353 ALOGE("Cannot open \"%s\": %s", config_file, strerror(errno)); 354 free(pbuf); 355 return 0; 356 } 357 nread = TEMP_FAILURE_RETRY(read(srcfd, pbuf, sb.st_size)); 358 close(srcfd); 359 if (nread < 0) { 360 ALOGE("Cannot read \"%s\": %s", config_file, strerror(errno)); 361 free(pbuf); 362 return 0; 363 } 364 365 if (!strcmp(config_file, SUPP_CONFIG_FILE)) { 366 property_get("wifi.interface", ifc, WIFI_TEST_INTERFACE); 367 } else { 368 strcpy(ifc, CONTROL_IFACE_PATH); 369 } 370 /* 371 * if there is a "ctrl_interface=<value>" entry, re-write it ONLY if it is 372 * NOT a directory. The non-directory value option is an Android add-on 373 * that allows the control interface to be exchanged through an environment 374 * variable (initialized by the "init" program when it starts a service 375 * with a "socket" option). 376 * 377 * The <value> is deemed to be a directory if the "DIR=" form is used or 378 * the value begins with "/". 379 */ 380 if ((sptr = strstr(pbuf, "ctrl_interface=")) && 381 (!strstr(pbuf, "ctrl_interface=DIR=")) && 382 (!strstr(pbuf, "ctrl_interface=/"))) { 383 char *iptr = sptr + strlen("ctrl_interface="); 384 int ilen = 0; 385 int mlen = strlen(ifc); 386 int nwrite; 387 if (strncmp(ifc, iptr, mlen) != 0) { 388 ALOGE("ctrl_interface != %s", ifc); 389 while (((ilen + (iptr - pbuf)) < nread) && (iptr[ilen] != '\n')) 390 ilen++; 391 mlen = ((ilen >= mlen) ? ilen : mlen) + 1; 392 memmove(iptr + mlen, iptr + ilen + 1, nread - (iptr + ilen + 1 - pbuf)); 393 memset(iptr, '\n', mlen); 394 memcpy(iptr, ifc, strlen(ifc)); 395 destfd = TEMP_FAILURE_RETRY(open(config_file, O_RDWR, 0660)); 396 if (destfd < 0) { 397 ALOGE("Cannot update \"%s\": %s", config_file, strerror(errno)); 398 free(pbuf); 399 return -1; 400 } 401 TEMP_FAILURE_RETRY(write(destfd, pbuf, nread + mlen - ilen -1)); 402 close(destfd); 403 } 404 } 405 free(pbuf); 406 return 0; 407 } 408 409 int ensure_config_file_exists(const char *config_file) 410 { 411 char buf[2048]; 412 int srcfd, destfd; 413 struct stat sb; 414 int nread; 415 int ret; 416 417 ret = access(config_file, R_OK|W_OK); 418 if ((ret == 0) || (errno == EACCES)) { 419 if ((ret != 0) && 420 (chmod(config_file, S_IRUSR|S_IWUSR|S_IRGRP|S_IWGRP) != 0)) { 421 ALOGE("Cannot set RW to \"%s\": %s", config_file, strerror(errno)); 422 return -1; 423 } 424 /* return if filesize is at least 10 bytes */ 425 if (stat(config_file, &sb) == 0 && sb.st_size > 10) { 426 return update_ctrl_interface(config_file); 427 } 428 } else if (errno != ENOENT) { 429 ALOGE("Cannot access \"%s\": %s", config_file, strerror(errno)); 430 return -1; 431 } 432 433 srcfd = TEMP_FAILURE_RETRY(open(SUPP_CONFIG_TEMPLATE, O_RDONLY)); 434 if (srcfd < 0) { 435 ALOGE("Cannot open \"%s\": %s", SUPP_CONFIG_TEMPLATE, strerror(errno)); 436 return -1; 437 } 438 439 destfd = TEMP_FAILURE_RETRY(open(config_file, O_CREAT|O_RDWR, 0660)); 440 if (destfd < 0) { 441 close(srcfd); 442 ALOGE("Cannot create \"%s\": %s", config_file, strerror(errno)); 443 return -1; 444 } 445 446 while ((nread = TEMP_FAILURE_RETRY(read(srcfd, buf, sizeof(buf)))) != 0) { 447 if (nread < 0) { 448 ALOGE("Error reading \"%s\": %s", SUPP_CONFIG_TEMPLATE, strerror(errno)); 449 close(srcfd); 450 close(destfd); 451 unlink(config_file); 452 return -1; 453 } 454 TEMP_FAILURE_RETRY(write(destfd, buf, nread)); 455 } 456 457 close(destfd); 458 close(srcfd); 459 460 /* chmod is needed because open() didn't set permisions properly */ 461 if (chmod(config_file, 0660) < 0) { 462 ALOGE("Error changing permissions of %s to 0660: %s", 463 config_file, strerror(errno)); 464 unlink(config_file); 465 return -1; 466 } 467 468 if (chown(config_file, AID_SYSTEM, AID_WIFI) < 0) { 469 ALOGE("Error changing group ownership of %s to %d: %s", 470 config_file, AID_WIFI, strerror(errno)); 471 unlink(config_file); 472 return -1; 473 } 474 return update_ctrl_interface(config_file); 475 } 476 477 /** 478 * wifi_wpa_ctrl_cleanup() - Delete any local UNIX domain socket files that 479 * may be left over from clients that were previously connected to 480 * wpa_supplicant. This keeps these files from being orphaned in the 481 * event of crashes that prevented them from being removed as part 482 * of the normal orderly shutdown. 483 */ 484 void wifi_wpa_ctrl_cleanup(void) 485 { 486 DIR *dir; 487 struct dirent entry; 488 struct dirent *result; 489 size_t dirnamelen; 490 size_t maxcopy; 491 char pathname[PATH_MAX]; 492 char *namep; 493 char *local_socket_dir = CONFIG_CTRL_IFACE_CLIENT_DIR; 494 char *local_socket_prefix = CONFIG_CTRL_IFACE_CLIENT_PREFIX; 495 496 if ((dir = opendir(local_socket_dir)) == NULL) 497 return; 498 499 dirnamelen = (size_t)snprintf(pathname, sizeof(pathname), "%s/", local_socket_dir); 500 if (dirnamelen >= sizeof(pathname)) { 501 closedir(dir); 502 return; 503 } 504 namep = pathname + dirnamelen; 505 maxcopy = PATH_MAX - dirnamelen; 506 while (readdir_r(dir, &entry, &result) == 0 && result != NULL) { 507 if (strncmp(entry.d_name, local_socket_prefix, strlen(local_socket_prefix)) == 0) { 508 if (strlcpy(namep, entry.d_name, maxcopy) < maxcopy) { 509 unlink(pathname); 510 } 511 } 512 } 513 closedir(dir); 514 } 515 516 int wifi_start_supplicant(int p2p_supported) 517 { 518 char supp_status[PROPERTY_VALUE_MAX] = {'\0'}; 519 int count = 200; /* wait at most 20 seconds for completion */ 520 #ifdef HAVE_LIBC_SYSTEM_PROPERTIES 521 const prop_info *pi; 522 unsigned serial = 0, i; 523 #endif 524 525 if (p2p_supported) { 526 strcpy(supplicant_name, P2P_SUPPLICANT_NAME); 527 strcpy(supplicant_prop_name, P2P_PROP_NAME); 528 529 /* Ensure p2p config file is created */ 530 if (ensure_config_file_exists(P2P_CONFIG_FILE) < 0) { 531 ALOGE("Failed to create a p2p config file"); 532 return -1; 533 } 534 535 } else { 536 strcpy(supplicant_name, SUPPLICANT_NAME); 537 strcpy(supplicant_prop_name, SUPP_PROP_NAME); 538 } 539 540 /* Check whether already running */ 541 if (property_get(supplicant_name, supp_status, NULL) 542 && strcmp(supp_status, "running") == 0) { 543 return 0; 544 } 545 546 /* Before starting the daemon, make sure its config file exists */ 547 if (ensure_config_file_exists(SUPP_CONFIG_FILE) < 0) { 548 ALOGE("Wi-Fi will not be enabled"); 549 return -1; 550 } 551 552 if (ensure_entropy_file_exists() < 0) { 553 ALOGE("Wi-Fi entropy file was not created"); 554 } 555 556 /* Clear out any stale socket files that might be left over. */ 557 wifi_wpa_ctrl_cleanup(); 558 559 /* Reset sockets used for exiting from hung state */ 560 for (i=0; i<MAX_CONNS; i++) { 561 exit_sockets[i][0] = exit_sockets[i][1] = -1; 562 } 563 564 #ifdef HAVE_LIBC_SYSTEM_PROPERTIES 565 /* 566 * Get a reference to the status property, so we can distinguish 567 * the case where it goes stopped => running => stopped (i.e., 568 * it start up, but fails right away) from the case in which 569 * it starts in the stopped state and never manages to start 570 * running at all. 571 */ 572 pi = __system_property_find(supplicant_prop_name); 573 if (pi != NULL) { 574 serial = pi->serial; 575 } 576 #endif 577 property_get("wifi.interface", primary_iface, WIFI_TEST_INTERFACE); 578 579 property_set("ctl.start", supplicant_name); 580 sched_yield(); 581 582 while (count-- > 0) { 583 #ifdef HAVE_LIBC_SYSTEM_PROPERTIES 584 if (pi == NULL) { 585 pi = __system_property_find(supplicant_prop_name); 586 } 587 if (pi != NULL) { 588 __system_property_read(pi, NULL, supp_status); 589 if (strcmp(supp_status, "running") == 0) { 590 return 0; 591 } else if (pi->serial != serial && 592 strcmp(supp_status, "stopped") == 0) { 593 return -1; 594 } 595 } 596 #else 597 if (property_get(supplicant_prop_name, supp_status, NULL)) { 598 if (strcmp(supp_status, "running") == 0) 599 return 0; 600 } 601 #endif 602 usleep(100000); 603 } 604 return -1; 605 } 606 607 int wifi_stop_supplicant() 608 { 609 char supp_status[PROPERTY_VALUE_MAX] = {'\0'}; 610 int count = 50; /* wait at most 5 seconds for completion */ 611 612 /* Check whether supplicant already stopped */ 613 if (property_get(supplicant_prop_name, supp_status, NULL) 614 && strcmp(supp_status, "stopped") == 0) { 615 return 0; 616 } 617 618 property_set("ctl.stop", supplicant_name); 619 sched_yield(); 620 621 while (count-- > 0) { 622 if (property_get(supplicant_prop_name, supp_status, NULL)) { 623 if (strcmp(supp_status, "stopped") == 0) 624 return 0; 625 } 626 usleep(100000); 627 } 628 return -1; 629 } 630 631 int wifi_connect_on_socket_path(int index, const char *path) 632 { 633 char supp_status[PROPERTY_VALUE_MAX] = {'\0'}; 634 635 /* Make sure supplicant is running */ 636 if (!property_get(supplicant_prop_name, supp_status, NULL) 637 || strcmp(supp_status, "running") != 0) { 638 ALOGE("Supplicant not running, cannot connect"); 639 return -1; 640 } 641 642 ctrl_conn[index] = wpa_ctrl_open(path); 643 if (ctrl_conn[index] == NULL) { 644 ALOGE("Unable to open connection to supplicant on \"%s\": %s", 645 path, strerror(errno)); 646 return -1; 647 } 648 monitor_conn[index] = wpa_ctrl_open(path); 649 if (monitor_conn[index] == NULL) { 650 wpa_ctrl_close(ctrl_conn[index]); 651 ctrl_conn[index] = NULL; 652 return -1; 653 } 654 if (wpa_ctrl_attach(monitor_conn[index]) != 0) { 655 wpa_ctrl_close(monitor_conn[index]); 656 wpa_ctrl_close(ctrl_conn[index]); 657 ctrl_conn[index] = monitor_conn[index] = NULL; 658 return -1; 659 } 660 661 if (socketpair(AF_UNIX, SOCK_STREAM, 0, exit_sockets[index]) == -1) { 662 wpa_ctrl_close(monitor_conn[index]); 663 wpa_ctrl_close(ctrl_conn[index]); 664 ctrl_conn[index] = monitor_conn[index] = NULL; 665 return -1; 666 } 667 668 return 0; 669 } 670 671 /* Establishes the control and monitor socket connections on the interface */ 672 int wifi_connect_to_supplicant(const char *ifname) 673 { 674 char path[256]; 675 676 if (is_primary_interface(ifname)) { 677 if (access(IFACE_DIR, F_OK) == 0) { 678 snprintf(path, sizeof(path), "%s/%s", IFACE_DIR, primary_iface); 679 } else { 680 strlcpy(path, primary_iface, sizeof(path)); 681 } 682 return wifi_connect_on_socket_path(PRIMARY, path); 683 } else { 684 sprintf(path, "%s/%s", CONTROL_IFACE_PATH, ifname); 685 return wifi_connect_on_socket_path(SECONDARY, path); 686 } 687 } 688 689 int wifi_send_command(int index, const char *cmd, char *reply, size_t *reply_len) 690 { 691 int ret; 692 693 if (ctrl_conn[index] == NULL) { 694 ALOGV("Not connected to wpa_supplicant - \"%s\" command dropped.\n", cmd); 695 return -1; 696 } 697 ret = wpa_ctrl_request(ctrl_conn[index], cmd, strlen(cmd), reply, reply_len, NULL); 698 if (ret == -2) { 699 ALOGD("'%s' command timed out.\n", cmd); 700 /* unblocks the monitor receive socket for termination */ 701 TEMP_FAILURE_RETRY(write(exit_sockets[index][0], "T", 1)); 702 return -2; 703 } else if (ret < 0 || strncmp(reply, "FAIL", 4) == 0) { 704 return -1; 705 } 706 if (strncmp(cmd, "PING", 4) == 0) { 707 reply[*reply_len] = '\0'; 708 } 709 return 0; 710 } 711 712 int wifi_ctrl_recv(int index, char *reply, size_t *reply_len) 713 { 714 int res; 715 int ctrlfd = wpa_ctrl_get_fd(monitor_conn[index]); 716 struct pollfd rfds[2]; 717 718 memset(rfds, 0, 2 * sizeof(struct pollfd)); 719 rfds[0].fd = ctrlfd; 720 rfds[0].events |= POLLIN; 721 rfds[1].fd = exit_sockets[index][1]; 722 rfds[1].events |= POLLIN; 723 res = TEMP_FAILURE_RETRY(poll(rfds, 2, -1)); 724 if (res < 0) { 725 ALOGE("Error poll = %d", res); 726 return res; 727 } 728 if (rfds[0].revents & POLLIN) { 729 return wpa_ctrl_recv(monitor_conn[index], reply, reply_len); 730 } else if (rfds[1].revents & POLLIN) { 731 /* Close only the p2p sockets on receive side 732 * see wifi_close_supplicant_connection() 733 */ 734 if (index == SECONDARY) { 735 ALOGD("close sockets %d", index); 736 wifi_close_sockets(index); 737 } 738 } 739 return -2; 740 } 741 742 int wifi_wait_on_socket(int index, char *buf, size_t buflen) 743 { 744 size_t nread = buflen - 1; 745 int fd; 746 fd_set rfds; 747 int result; 748 struct timeval tval; 749 struct timeval *tptr; 750 751 if (monitor_conn[index] == NULL) { 752 ALOGD("Connection closed\n"); 753 strncpy(buf, WPA_EVENT_TERMINATING " - connection closed", buflen-1); 754 buf[buflen-1] = '\0'; 755 return strlen(buf); 756 } 757 758 result = wifi_ctrl_recv(index, buf, &nread); 759 760 /* Terminate reception on exit socket */ 761 if (result == -2) { 762 strncpy(buf, WPA_EVENT_TERMINATING " - connection closed", buflen-1); 763 buf[buflen-1] = '\0'; 764 return strlen(buf); 765 } 766 767 if (result < 0) { 768 ALOGD("wifi_ctrl_recv failed: %s\n", strerror(errno)); 769 strncpy(buf, WPA_EVENT_TERMINATING " - recv error", buflen-1); 770 buf[buflen-1] = '\0'; 771 return strlen(buf); 772 } 773 buf[nread] = '\0'; 774 /* Check for EOF on the socket */ 775 if (result == 0 && nread == 0) { 776 /* Fabricate an event to pass up */ 777 ALOGD("Received EOF on supplicant socket\n"); 778 strncpy(buf, WPA_EVENT_TERMINATING " - signal 0 received", buflen-1); 779 buf[buflen-1] = '\0'; 780 return strlen(buf); 781 } 782 /* 783 * Events strings are in the format 784 * 785 * <N>CTRL-EVENT-XXX 786 * 787 * where N is the message level in numerical form (0=VERBOSE, 1=DEBUG, 788 * etc.) and XXX is the event name. The level information is not useful 789 * to us, so strip it off. 790 */ 791 if (buf[0] == '<') { 792 char *match = strchr(buf, '>'); 793 if (match != NULL) { 794 nread -= (match+1-buf); 795 memmove(buf, match+1, nread+1); 796 } 797 } 798 799 return nread; 800 } 801 802 int wifi_wait_for_event(const char *ifname, char *buf, size_t buflen) 803 { 804 if (is_primary_interface(ifname)) { 805 return wifi_wait_on_socket(PRIMARY, buf, buflen); 806 } else { 807 return wifi_wait_on_socket(SECONDARY, buf, buflen); 808 } 809 } 810 811 void wifi_close_sockets(int index) 812 { 813 if (ctrl_conn[index] != NULL) { 814 wpa_ctrl_close(ctrl_conn[index]); 815 ctrl_conn[index] = NULL; 816 } 817 818 if (monitor_conn[index] != NULL) { 819 wpa_ctrl_close(monitor_conn[index]); 820 monitor_conn[index] = NULL; 821 } 822 823 if (exit_sockets[index][0] >= 0) { 824 close(exit_sockets[index][0]); 825 exit_sockets[index][0] = -1; 826 } 827 828 if (exit_sockets[index][1] >= 0) { 829 close(exit_sockets[index][1]); 830 exit_sockets[index][1] = -1; 831 } 832 } 833 834 void wifi_close_supplicant_connection(const char *ifname) 835 { 836 char supp_status[PROPERTY_VALUE_MAX] = {'\0'}; 837 int count = 50; /* wait at most 5 seconds to ensure init has stopped stupplicant */ 838 839 if (is_primary_interface(ifname)) { 840 wifi_close_sockets(PRIMARY); 841 } else { 842 /* p2p socket termination needs unblocking the monitor socket 843 * STA connection does not need it since supplicant gets shutdown 844 */ 845 TEMP_FAILURE_RETRY(write(exit_sockets[SECONDARY][0], "T", 1)); 846 /* p2p sockets are closed after the monitor thread 847 * receives the terminate on the exit socket 848 */ 849 return; 850 } 851 852 while (count-- > 0) { 853 if (property_get(supplicant_prop_name, supp_status, NULL)) { 854 if (strcmp(supp_status, "stopped") == 0) 855 return; 856 } 857 usleep(100000); 858 } 859 } 860 861 int wifi_command(const char *ifname, const char *command, char *reply, size_t *reply_len) 862 { 863 if (is_primary_interface(ifname)) { 864 return wifi_send_command(PRIMARY, command, reply, reply_len); 865 } else { 866 return wifi_send_command(SECONDARY, command, reply, reply_len); 867 } 868 } 869 870 const char *wifi_get_fw_path(int fw_type) 871 { 872 switch (fw_type) { 873 case WIFI_GET_FW_PATH_STA: 874 return WIFI_DRIVER_FW_PATH_STA; 875 case WIFI_GET_FW_PATH_AP: 876 return WIFI_DRIVER_FW_PATH_AP; 877 case WIFI_GET_FW_PATH_P2P: 878 return WIFI_DRIVER_FW_PATH_P2P; 879 } 880 return NULL; 881 } 882 883 int wifi_change_fw_path(const char *fwpath) 884 { 885 int len; 886 int fd; 887 int ret = 0; 888 889 if (!fwpath) 890 return ret; 891 fd = TEMP_FAILURE_RETRY(open(WIFI_DRIVER_FW_PATH_PARAM, O_WRONLY)); 892 if (fd < 0) { 893 ALOGE("Failed to open wlan fw path param (%s)", strerror(errno)); 894 return -1; 895 } 896 len = strlen(fwpath) + 1; 897 if (TEMP_FAILURE_RETRY(write(fd, fwpath, len)) != len) { 898 ALOGE("Failed to write wlan fw path param (%s)", strerror(errno)); 899 ret = -1; 900 } 901 close(fd); 902 return ret; 903 } 904
