init.c revision 150f19e373f57c245609c2252be257b8a9ab15fd
1/* 2 * Copyright (C) 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 <stdio.h> 18#include <stdlib.h> 19#include <string.h> 20#include <unistd.h> 21#include <fcntl.h> 22#include <ctype.h> 23#include <signal.h> 24#include <sys/wait.h> 25#include <sys/mount.h> 26#include <sys/stat.h> 27#include <sys/poll.h> 28#include <errno.h> 29#include <stdarg.h> 30#include <mtd/mtd-user.h> 31#include <sys/types.h> 32#include <sys/socket.h> 33#include <sys/un.h> 34#include <libgen.h> 35 36#include <cutils/sockets.h> 37#include <cutils/iosched_policy.h> 38#include <private/android_filesystem_config.h> 39#include <termios.h> 40 41#include <sys/system_properties.h> 42 43#include "devices.h" 44#include "init.h" 45#include "list.h" 46#include "log.h" 47#include "property_service.h" 48#include "bootchart.h" 49#include "signal_handler.h" 50#include "keychords.h" 51#include "init_parser.h" 52#include "util.h" 53#include "ueventd.h" 54 55static int property_triggers_enabled = 0; 56 57#if BOOTCHART 58static int bootchart_count; 59#endif 60 61static char console[32]; 62static char serialno[32]; 63static char bootmode[32]; 64static char baseband[32]; 65static char carrier[32]; 66static char bootloader[32]; 67static char hardware[32]; 68static unsigned revision = 0; 69static char qemu[32]; 70 71static struct action *cur_action = NULL; 72static struct command *cur_command = NULL; 73static struct listnode *command_queue = NULL; 74 75void notify_service_state(const char *name, const char *state) 76{ 77 char pname[PROP_NAME_MAX]; 78 int len = strlen(name); 79 if ((len + 10) > PROP_NAME_MAX) 80 return; 81 snprintf(pname, sizeof(pname), "init.svc.%s", name); 82 property_set(pname, state); 83} 84 85static int have_console; 86static char *console_name = "/dev/console"; 87static time_t process_needs_restart; 88 89static const char *ENV[32]; 90 91/* add_environment - add "key=value" to the current environment */ 92int add_environment(const char *key, const char *val) 93{ 94 int n; 95 96 for (n = 0; n < 31; n++) { 97 if (!ENV[n]) { 98 size_t len = strlen(key) + strlen(val) + 2; 99 char *entry = malloc(len); 100 snprintf(entry, len, "%s=%s", key, val); 101 ENV[n] = entry; 102 return 0; 103 } 104 } 105 106 return 1; 107} 108 109static void zap_stdio(void) 110{ 111 int fd; 112 fd = open("/dev/null", O_RDWR); 113 dup2(fd, 0); 114 dup2(fd, 1); 115 dup2(fd, 2); 116 close(fd); 117} 118 119static void open_console() 120{ 121 int fd; 122 if ((fd = open(console_name, O_RDWR)) < 0) { 123 fd = open("/dev/null", O_RDWR); 124 } 125 dup2(fd, 0); 126 dup2(fd, 1); 127 dup2(fd, 2); 128 close(fd); 129} 130 131static void publish_socket(const char *name, int fd) 132{ 133 char key[64] = ANDROID_SOCKET_ENV_PREFIX; 134 char val[64]; 135 136 strlcpy(key + sizeof(ANDROID_SOCKET_ENV_PREFIX) - 1, 137 name, 138 sizeof(key) - sizeof(ANDROID_SOCKET_ENV_PREFIX)); 139 snprintf(val, sizeof(val), "%d", fd); 140 add_environment(key, val); 141 142 /* make sure we don't close-on-exec */ 143 fcntl(fd, F_SETFD, 0); 144} 145 146void service_start(struct service *svc, const char *dynamic_args) 147{ 148 struct stat s; 149 pid_t pid; 150 int needs_console; 151 int n; 152 153 /* starting a service removes it from the disabled 154 * state and immediately takes it out of the restarting 155 * state if it was in there 156 */ 157 svc->flags &= (~(SVC_DISABLED|SVC_RESTARTING)); 158 svc->time_started = 0; 159 160 /* running processes require no additional work -- if 161 * they're in the process of exiting, we've ensured 162 * that they will immediately restart on exit, unless 163 * they are ONESHOT 164 */ 165 if (svc->flags & SVC_RUNNING) { 166 return; 167 } 168 169 needs_console = (svc->flags & SVC_CONSOLE) ? 1 : 0; 170 if (needs_console && (!have_console)) { 171 ERROR("service '%s' requires console\n", svc->name); 172 svc->flags |= SVC_DISABLED; 173 return; 174 } 175 176 if (stat(svc->args[0], &s) != 0) { 177 ERROR("cannot find '%s', disabling '%s'\n", svc->args[0], svc->name); 178 svc->flags |= SVC_DISABLED; 179 return; 180 } 181 182 if ((!(svc->flags & SVC_ONESHOT)) && dynamic_args) { 183 ERROR("service '%s' must be one-shot to use dynamic args, disabling\n", 184 svc->args[0]); 185 svc->flags |= SVC_DISABLED; 186 return; 187 } 188 189 NOTICE("starting '%s'\n", svc->name); 190 191 pid = fork(); 192 193 if (pid == 0) { 194 struct socketinfo *si; 195 struct svcenvinfo *ei; 196 char tmp[32]; 197 int fd, sz; 198 199 if (properties_inited()) { 200 get_property_workspace(&fd, &sz); 201 sprintf(tmp, "%d,%d", dup(fd), sz); 202 add_environment("ANDROID_PROPERTY_WORKSPACE", tmp); 203 } 204 205 for (ei = svc->envvars; ei; ei = ei->next) 206 add_environment(ei->name, ei->value); 207 208 for (si = svc->sockets; si; si = si->next) { 209 int s = create_socket(si->name, 210 !strcmp(si->type, "dgram") ? 211 SOCK_DGRAM : SOCK_STREAM, 212 si->perm, si->uid, si->gid); 213 if (s >= 0) { 214 publish_socket(si->name, s); 215 } 216 } 217 218 if (svc->ioprio_class != IoSchedClass_NONE) { 219 if (android_set_ioprio(getpid(), svc->ioprio_class, svc->ioprio_pri)) { 220 ERROR("Failed to set pid %d ioprio = %d,%d: %s\n", 221 getpid(), svc->ioprio_class, svc->ioprio_pri, strerror(errno)); 222 } 223 } 224 225 if (needs_console) { 226 setsid(); 227 open_console(); 228 } else { 229 zap_stdio(); 230 } 231 232#if 0 233 for (n = 0; svc->args[n]; n++) { 234 INFO("args[%d] = '%s'\n", n, svc->args[n]); 235 } 236 for (n = 0; ENV[n]; n++) { 237 INFO("env[%d] = '%s'\n", n, ENV[n]); 238 } 239#endif 240 241 setpgid(0, getpid()); 242 243 /* as requested, set our gid, supplemental gids, and uid */ 244 if (svc->gid) { 245 setgid(svc->gid); 246 } 247 if (svc->nr_supp_gids) { 248 setgroups(svc->nr_supp_gids, svc->supp_gids); 249 } 250 if (svc->uid) { 251 setuid(svc->uid); 252 } 253 254 if (!dynamic_args) { 255 if (execve(svc->args[0], (char**) svc->args, (char**) ENV) < 0) { 256 ERROR("cannot execve('%s'): %s\n", svc->args[0], strerror(errno)); 257 } 258 } else { 259 char *arg_ptrs[INIT_PARSER_MAXARGS+1]; 260 int arg_idx = svc->nargs; 261 char *tmp = strdup(dynamic_args); 262 char *next = tmp; 263 char *bword; 264 265 /* Copy the static arguments */ 266 memcpy(arg_ptrs, svc->args, (svc->nargs * sizeof(char *))); 267 268 while((bword = strsep(&next, " "))) { 269 arg_ptrs[arg_idx++] = bword; 270 if (arg_idx == INIT_PARSER_MAXARGS) 271 break; 272 } 273 arg_ptrs[arg_idx] = '\0'; 274 execve(svc->args[0], (char**) arg_ptrs, (char**) ENV); 275 } 276 _exit(127); 277 } 278 279 if (pid < 0) { 280 ERROR("failed to start '%s'\n", svc->name); 281 svc->pid = 0; 282 return; 283 } 284 285 svc->time_started = gettime(); 286 svc->pid = pid; 287 svc->flags |= SVC_RUNNING; 288 289 if (properties_inited()) 290 notify_service_state(svc->name, "running"); 291} 292 293void service_stop(struct service *svc) 294{ 295 /* we are no longer running, nor should we 296 * attempt to restart 297 */ 298 svc->flags &= (~(SVC_RUNNING|SVC_RESTARTING)); 299 300 /* if the service has not yet started, prevent 301 * it from auto-starting with its class 302 */ 303 svc->flags |= SVC_DISABLED; 304 305 if (svc->pid) { 306 NOTICE("service '%s' is being killed\n", svc->name); 307 kill(-svc->pid, SIGTERM); 308 notify_service_state(svc->name, "stopping"); 309 } else { 310 notify_service_state(svc->name, "stopped"); 311 } 312} 313 314void property_changed(const char *name, const char *value) 315{ 316 if (property_triggers_enabled) 317 queue_property_triggers(name, value); 318} 319 320static void restart_service_if_needed(struct service *svc) 321{ 322 time_t next_start_time = svc->time_started + 5; 323 324 if (next_start_time <= gettime()) { 325 svc->flags &= (~SVC_RESTARTING); 326 service_start(svc, NULL); 327 return; 328 } 329 330 if ((next_start_time < process_needs_restart) || 331 (process_needs_restart == 0)) { 332 process_needs_restart = next_start_time; 333 } 334} 335 336static void restart_processes() 337{ 338 process_needs_restart = 0; 339 service_for_each_flags(SVC_RESTARTING, 340 restart_service_if_needed); 341} 342 343static void msg_start(const char *name) 344{ 345 struct service *svc; 346 char *tmp = NULL; 347 char *args = NULL; 348 349 if (!strchr(name, ':')) 350 svc = service_find_by_name(name); 351 else { 352 tmp = strdup(name); 353 args = strchr(tmp, ':'); 354 *args = '\0'; 355 args++; 356 357 svc = service_find_by_name(tmp); 358 } 359 360 if (svc) { 361 service_start(svc, args); 362 } else { 363 ERROR("no such service '%s'\n", name); 364 } 365 if (tmp) 366 free(tmp); 367} 368 369static void msg_stop(const char *name) 370{ 371 struct service *svc = service_find_by_name(name); 372 373 if (svc) { 374 service_stop(svc); 375 } else { 376 ERROR("no such service '%s'\n", name); 377 } 378} 379 380void handle_control_message(const char *msg, const char *arg) 381{ 382 if (!strcmp(msg,"start")) { 383 msg_start(arg); 384 } else if (!strcmp(msg,"stop")) { 385 msg_stop(arg); 386 } else { 387 ERROR("unknown control msg '%s'\n", msg); 388 } 389} 390 391static void import_kernel_nv(char *name, int in_qemu) 392{ 393 char *value = strchr(name, '='); 394 395 if (value == 0) return; 396 *value++ = 0; 397 if (*name == 0) return; 398 399 if (!in_qemu) 400 { 401 /* on a real device, white-list the kernel options */ 402 if (!strcmp(name,"qemu")) { 403 strlcpy(qemu, value, sizeof(qemu)); 404 } else if (!strcmp(name,"androidboot.console")) { 405 strlcpy(console, value, sizeof(console)); 406 } else if (!strcmp(name,"androidboot.mode")) { 407 strlcpy(bootmode, value, sizeof(bootmode)); 408 } else if (!strcmp(name,"androidboot.serialno")) { 409 strlcpy(serialno, value, sizeof(serialno)); 410 } else if (!strcmp(name,"androidboot.baseband")) { 411 strlcpy(baseband, value, sizeof(baseband)); 412 } else if (!strcmp(name,"androidboot.carrier")) { 413 strlcpy(carrier, value, sizeof(carrier)); 414 } else if (!strcmp(name,"androidboot.bootloader")) { 415 strlcpy(bootloader, value, sizeof(bootloader)); 416 } else if (!strcmp(name,"androidboot.hardware")) { 417 strlcpy(hardware, value, sizeof(hardware)); 418 } 419 } else { 420 /* in the emulator, export any kernel option with the 421 * ro.kernel. prefix */ 422 char buff[32]; 423 int len = snprintf( buff, sizeof(buff), "ro.kernel.%s", name ); 424 if (len < (int)sizeof(buff)) { 425 property_set( buff, value ); 426 } 427 } 428} 429 430static void import_kernel_cmdline(int in_qemu) 431{ 432 char cmdline[1024]; 433 char *ptr; 434 int fd; 435 436 fd = open("/proc/cmdline", O_RDONLY); 437 if (fd >= 0) { 438 int n = read(fd, cmdline, 1023); 439 if (n < 0) n = 0; 440 441 /* get rid of trailing newline, it happens */ 442 if (n > 0 && cmdline[n-1] == '\n') n--; 443 444 cmdline[n] = 0; 445 close(fd); 446 } else { 447 cmdline[0] = 0; 448 } 449 450 ptr = cmdline; 451 while (ptr && *ptr) { 452 char *x = strchr(ptr, ' '); 453 if (x != 0) *x++ = 0; 454 import_kernel_nv(ptr, in_qemu); 455 ptr = x; 456 } 457 458 /* don't expose the raw commandline to nonpriv processes */ 459 chmod("/proc/cmdline", 0440); 460} 461 462static struct command *get_first_command(struct action *act) 463{ 464 struct listnode *node; 465 node = list_head(&act->commands); 466 if (!node) 467 return NULL; 468 469 return node_to_item(node, struct command, clist); 470} 471 472static struct command *get_next_command(struct action *act, struct command *cmd) 473{ 474 struct listnode *node; 475 node = cmd->clist.next; 476 if (!node) 477 return NULL; 478 if (node == &act->commands) 479 return NULL; 480 481 return node_to_item(node, struct command, clist); 482} 483 484static int is_last_command(struct action *act, struct command *cmd) 485{ 486 return (list_tail(&act->commands) == &cmd->clist); 487} 488 489void execute_one_command(void) 490{ 491 int ret; 492 493 if (!cur_action || !cur_command || is_last_command(cur_action, cur_command)) { 494 cur_action = action_remove_queue_head(); 495 cur_command = NULL; 496 if (!cur_action) 497 return; 498 INFO("processing action %p (%s)\n", cur_action, cur_action->name); 499 cur_command = get_first_command(cur_action); 500 } else { 501 cur_command = get_next_command(cur_action, cur_command); 502 } 503 504 if (!cur_command) 505 return; 506 507 ret = cur_command->func(cur_command->nargs, cur_command->args); 508 INFO("command '%s' r=%d\n", cur_command->args[0], ret); 509} 510 511static int wait_for_coldboot_done_action(int nargs, char **args) 512{ 513 int ret; 514 INFO("wait for %s\n", coldboot_done); 515 ret = wait_for_file(coldboot_done, COMMAND_RETRY_TIMEOUT); 516 if (ret) 517 ERROR("Timed out waiting for %s\n", coldboot_done); 518 return ret; 519} 520 521static int property_init_action(int nargs, char **args) 522{ 523 INFO("property init\n"); 524 property_init(); 525 return 0; 526} 527 528static int keychord_init_action(int nargs, char **args) 529{ 530 keychord_init(); 531 return 0; 532} 533 534static int console_init_action(int nargs, char **args) 535{ 536 int fd; 537 char tmp[PROP_VALUE_MAX]; 538 539 if (console[0]) { 540 snprintf(tmp, sizeof(tmp), "/dev/%s", console); 541 console_name = strdup(tmp); 542 } 543 544 fd = open(console_name, O_RDWR); 545 if (fd >= 0) 546 have_console = 1; 547 close(fd); 548 549 if( load_565rle_image(INIT_IMAGE_FILE) ) { 550 fd = open("/dev/tty0", O_WRONLY); 551 if (fd >= 0) { 552 const char *msg; 553 msg = "\n" 554 "\n" 555 "\n" 556 "\n" 557 "\n" 558 "\n" 559 "\n" // console is 40 cols x 30 lines 560 "\n" 561 "\n" 562 "\n" 563 "\n" 564 "\n" 565 "\n" 566 "\n" 567 " A N D R O I D "; 568 write(fd, msg, strlen(msg)); 569 close(fd); 570 } 571 } 572 return 0; 573} 574 575static int set_init_properties_action(int nargs, char **args) 576{ 577 char tmp[PROP_VALUE_MAX]; 578 579 if (qemu[0]) 580 import_kernel_cmdline(1); 581 582 if (!strcmp(bootmode,"factory")) 583 property_set("ro.factorytest", "1"); 584 else if (!strcmp(bootmode,"factory2")) 585 property_set("ro.factorytest", "2"); 586 else 587 property_set("ro.factorytest", "0"); 588 589 property_set("ro.serialno", serialno[0] ? serialno : ""); 590 property_set("ro.bootmode", bootmode[0] ? bootmode : "unknown"); 591 property_set("ro.baseband", baseband[0] ? baseband : "unknown"); 592 property_set("ro.carrier", carrier[0] ? carrier : "unknown"); 593 property_set("ro.bootloader", bootloader[0] ? bootloader : "unknown"); 594 595 property_set("ro.hardware", hardware); 596 snprintf(tmp, PROP_VALUE_MAX, "%d", revision); 597 property_set("ro.revision", tmp); 598 return 0; 599} 600 601static int property_service_init_action(int nargs, char **args) 602{ 603 /* read any property files on system or data and 604 * fire up the property service. This must happen 605 * after the ro.foo properties are set above so 606 * that /data/local.prop cannot interfere with them. 607 */ 608 start_property_service(); 609 return 0; 610} 611 612static int signal_init_action(int nargs, char **args) 613{ 614 signal_init(); 615 return 0; 616} 617 618static int check_startup_action(int nargs, char **args) 619{ 620 /* make sure we actually have all the pieces we need */ 621 if ((get_property_set_fd() < 0) || 622 (get_signal_fd() < 0)) { 623 ERROR("init startup failure\n"); 624 exit(1); 625 } 626 return 0; 627} 628 629static int queue_property_triggers_action(int nargs, char **args) 630{ 631 queue_all_property_triggers(); 632 /* enable property triggers */ 633 property_triggers_enabled = 1; 634 return 0; 635} 636 637#if BOOTCHART 638static int bootchart_init_action(int nargs, char **args) 639{ 640 bootchart_count = bootchart_init(); 641 if (bootchart_count < 0) { 642 ERROR("bootcharting init failure\n"); 643 } else if (bootchart_count > 0) { 644 NOTICE("bootcharting started (period=%d ms)\n", bootchart_count*BOOTCHART_POLLING_MS); 645 } else { 646 NOTICE("bootcharting ignored\n"); 647 } 648} 649#endif 650 651int main(int argc, char **argv) 652{ 653 int fd_count = 0; 654 struct pollfd ufds[4]; 655 char *tmpdev; 656 char* debuggable; 657 char tmp[32]; 658 int property_set_fd_init = 0; 659 int signal_fd_init = 0; 660 int keychord_fd_init = 0; 661 662 if (!strcmp(basename(argv[0]), "ueventd")) 663 return ueventd_main(argc, argv); 664 665 /* clear the umask */ 666 umask(0); 667 668 /* Get the basic filesystem setup we need put 669 * together in the initramdisk on / and then we'll 670 * let the rc file figure out the rest. 671 */ 672 mkdir("/dev", 0755); 673 mkdir("/proc", 0755); 674 mkdir("/sys", 0755); 675 676 mount("tmpfs", "/dev", "tmpfs", MS_NOSUID, "mode=0755"); 677 mkdir("/dev/pts", 0755); 678 mkdir("/dev/socket", 0755); 679 mount("devpts", "/dev/pts", "devpts", 0, NULL); 680 mount("proc", "/proc", "proc", 0, NULL); 681 mount("sysfs", "/sys", "sysfs", 0, NULL); 682 683 /* We must have some place other than / to create the 684 * device nodes for kmsg and null, otherwise we won't 685 * be able to remount / read-only later on. 686 * Now that tmpfs is mounted on /dev, we can actually 687 * talk to the outside world. 688 */ 689 open_devnull_stdio(); 690 log_init(); 691 692 INFO("reading config file\n"); 693 init_parse_config_file("/init.rc"); 694 695 /* pull the kernel commandline and ramdisk properties file in */ 696 import_kernel_cmdline(0); 697 698 get_hardware_name(hardware, &revision); 699 snprintf(tmp, sizeof(tmp), "/init.%s.rc", hardware); 700 init_parse_config_file(tmp); 701 702 action_for_each_trigger("early-init", action_add_queue_tail); 703 704 queue_builtin_action(wait_for_coldboot_done_action, "wait_for_coldboot_done"); 705 queue_builtin_action(property_init_action, "property_init"); 706 queue_builtin_action(keychord_init_action, "keychord_init"); 707 queue_builtin_action(console_init_action, "console_init"); 708 queue_builtin_action(set_init_properties_action, "set_init_properties"); 709 710 /* execute all the boot actions to get us started */ 711 action_for_each_trigger("init", action_add_queue_tail); 712 action_for_each_trigger("early-fs", action_add_queue_tail); 713 action_for_each_trigger("fs", action_add_queue_tail); 714 action_for_each_trigger("post-fs", action_add_queue_tail); 715 716 queue_builtin_action(property_service_init_action, "property_service_init"); 717 queue_builtin_action(signal_init_action, "signal_init"); 718 queue_builtin_action(check_startup_action, "check_startup"); 719 720 /* execute all the boot actions to get us started */ 721 action_for_each_trigger("early-boot", action_add_queue_tail); 722 action_for_each_trigger("boot", action_add_queue_tail); 723 724 /* run all property triggers based on current state of the properties */ 725 queue_builtin_action(queue_property_triggers_action, "queue_propety_triggers"); 726 727 728#if BOOTCHART 729 queue_builtin_action(bootchart_init_action, "bootchart_init"); 730#endif 731 732 for(;;) { 733 int nr, i, timeout = -1; 734 735 execute_one_command(); 736 restart_processes(); 737 738 if (!property_set_fd_init && get_property_set_fd() > 0) { 739 ufds[fd_count].fd = get_property_set_fd(); 740 ufds[fd_count].events = POLLIN; 741 ufds[fd_count].revents = 0; 742 fd_count++; 743 property_set_fd_init = 1; 744 } 745 if (!signal_fd_init && get_signal_fd() > 0) { 746 ufds[fd_count].fd = get_signal_fd(); 747 ufds[fd_count].events = POLLIN; 748 ufds[fd_count].revents = 0; 749 fd_count++; 750 signal_fd_init = 1; 751 } 752 if (!keychord_fd_init && get_keychord_fd() > 0) { 753 ufds[fd_count].fd = get_keychord_fd(); 754 ufds[fd_count].events = POLLIN; 755 ufds[fd_count].revents = 0; 756 fd_count++; 757 keychord_fd_init = 1; 758 } 759 760 if (process_needs_restart) { 761 timeout = (process_needs_restart - gettime()) * 1000; 762 if (timeout < 0) 763 timeout = 0; 764 } 765 766 if (!action_queue_empty() || cur_action) 767 timeout = 0; 768 769#if BOOTCHART 770 if (bootchart_count > 0) { 771 if (timeout < 0 || timeout > BOOTCHART_POLLING_MS) 772 timeout = BOOTCHART_POLLING_MS; 773 if (bootchart_step() < 0 || --bootchart_count == 0) { 774 bootchart_finish(); 775 bootchart_count = 0; 776 } 777 } 778#endif 779 780 nr = poll(ufds, fd_count, timeout); 781 if (nr <= 0) 782 continue; 783 784 for (i = 0; i < fd_count; i++) { 785 if (ufds[i].revents == POLLIN) { 786 if (ufds[i].fd == get_property_set_fd()) 787 handle_property_set_fd(); 788 else if (ufds[i].fd == get_keychord_fd()) 789 handle_keychord(); 790 else if (ufds[i].fd == get_signal_fd()) 791 handle_signal(); 792 } 793 } 794 } 795 796 return 0; 797} 798