builtins.c revision efbe7fc6cc871e95760b9b01d674a09f7e80eb6a
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 <sys/types.h> 18#include <sys/stat.h> 19#include <fcntl.h> 20#include <unistd.h> 21#include <string.h> 22#include <stdio.h> 23#include <linux/kd.h> 24#include <errno.h> 25#include <sys/socket.h> 26#include <netinet/in.h> 27#include <linux/if.h> 28#include <arpa/inet.h> 29#include <stdlib.h> 30#include <sys/mount.h> 31#include <sys/resource.h> 32#include <sys/wait.h> 33#include <linux/loop.h> 34#include <cutils/partition_utils.h> 35#include <cutils/android_reboot.h> 36#include <sys/system_properties.h> 37#include <fs_mgr.h> 38 39#include <selinux/selinux.h> 40#include <selinux/label.h> 41 42#include "init.h" 43#include "keywords.h" 44#include "property_service.h" 45#include "devices.h" 46#include "init_parser.h" 47#include "util.h" 48#include "log.h" 49 50#include <private/android_filesystem_config.h> 51 52void add_environment(const char *name, const char *value); 53 54extern int init_module(void *, unsigned long, const char *); 55 56static int write_file(const char *path, const char *value) 57{ 58 int fd, ret, len; 59 60 fd = open(path, O_WRONLY|O_CREAT, 0622); 61 62 if (fd < 0) 63 return -errno; 64 65 len = strlen(value); 66 67 do { 68 ret = write(fd, value, len); 69 } while (ret < 0 && errno == EINTR); 70 71 close(fd); 72 if (ret < 0) { 73 return -errno; 74 } else { 75 return 0; 76 } 77} 78 79static int _open(const char *path) 80{ 81 int fd; 82 83 fd = open(path, O_RDONLY | O_NOFOLLOW); 84 if (fd < 0) 85 fd = open(path, O_WRONLY | O_NOFOLLOW); 86 87 return fd; 88} 89 90static int _chown(const char *path, unsigned int uid, unsigned int gid) 91{ 92 int fd; 93 int ret; 94 95 fd = _open(path); 96 if (fd < 0) { 97 return -1; 98 } 99 100 ret = fchown(fd, uid, gid); 101 if (ret < 0) { 102 int errno_copy = errno; 103 close(fd); 104 errno = errno_copy; 105 return -1; 106 } 107 108 close(fd); 109 110 return 0; 111} 112 113static int _chmod(const char *path, mode_t mode) 114{ 115 int fd; 116 int ret; 117 118 fd = _open(path); 119 if (fd < 0) { 120 return -1; 121 } 122 123 ret = fchmod(fd, mode); 124 if (ret < 0) { 125 int errno_copy = errno; 126 close(fd); 127 errno = errno_copy; 128 return -1; 129 } 130 131 close(fd); 132 133 return 0; 134} 135 136static int insmod(const char *filename, char *options) 137{ 138 void *module; 139 unsigned size; 140 int ret; 141 142 module = read_file(filename, &size); 143 if (!module) 144 return -1; 145 146 ret = init_module(module, size, options); 147 148 free(module); 149 150 return ret; 151} 152 153static int setkey(struct kbentry *kbe) 154{ 155 int fd, ret; 156 157 fd = open("/dev/tty0", O_RDWR | O_SYNC); 158 if (fd < 0) 159 return -1; 160 161 ret = ioctl(fd, KDSKBENT, kbe); 162 163 close(fd); 164 return ret; 165} 166 167static int __ifupdown(const char *interface, int up) 168{ 169 struct ifreq ifr; 170 int s, ret; 171 172 strlcpy(ifr.ifr_name, interface, IFNAMSIZ); 173 174 s = socket(AF_INET, SOCK_DGRAM, 0); 175 if (s < 0) 176 return -1; 177 178 ret = ioctl(s, SIOCGIFFLAGS, &ifr); 179 if (ret < 0) { 180 goto done; 181 } 182 183 if (up) 184 ifr.ifr_flags |= IFF_UP; 185 else 186 ifr.ifr_flags &= ~IFF_UP; 187 188 ret = ioctl(s, SIOCSIFFLAGS, &ifr); 189 190done: 191 close(s); 192 return ret; 193} 194 195static void service_start_if_not_disabled(struct service *svc) 196{ 197 if (!(svc->flags & SVC_DISABLED)) { 198 service_start(svc, NULL); 199 } 200} 201 202int do_chdir(int nargs, char **args) 203{ 204 chdir(args[1]); 205 return 0; 206} 207 208int do_chroot(int nargs, char **args) 209{ 210 chroot(args[1]); 211 return 0; 212} 213 214int do_class_start(int nargs, char **args) 215{ 216 /* Starting a class does not start services 217 * which are explicitly disabled. They must 218 * be started individually. 219 */ 220 service_for_each_class(args[1], service_start_if_not_disabled); 221 return 0; 222} 223 224int do_class_stop(int nargs, char **args) 225{ 226 service_for_each_class(args[1], service_stop); 227 return 0; 228} 229 230int do_class_reset(int nargs, char **args) 231{ 232 service_for_each_class(args[1], service_reset); 233 return 0; 234} 235 236int do_domainname(int nargs, char **args) 237{ 238 return write_file("/proc/sys/kernel/domainname", args[1]); 239} 240 241int do_exec(int nargs, char **args) 242{ 243 return -1; 244} 245 246int do_export(int nargs, char **args) 247{ 248 add_environment(args[1], args[2]); 249 return 0; 250} 251 252int do_hostname(int nargs, char **args) 253{ 254 return write_file("/proc/sys/kernel/hostname", args[1]); 255} 256 257int do_ifup(int nargs, char **args) 258{ 259 return __ifupdown(args[1], 1); 260} 261 262 263static int do_insmod_inner(int nargs, char **args, int opt_len) 264{ 265 char options[opt_len + 1]; 266 int i; 267 268 options[0] = '\0'; 269 if (nargs > 2) { 270 strcpy(options, args[2]); 271 for (i = 3; i < nargs; ++i) { 272 strcat(options, " "); 273 strcat(options, args[i]); 274 } 275 } 276 277 return insmod(args[1], options); 278} 279 280int do_insmod(int nargs, char **args) 281{ 282 int i; 283 int size = 0; 284 285 if (nargs > 2) { 286 for (i = 2; i < nargs; ++i) 287 size += strlen(args[i]) + 1; 288 } 289 290 return do_insmod_inner(nargs, args, size); 291} 292 293int do_mkdir(int nargs, char **args) 294{ 295 mode_t mode = 0755; 296 int ret; 297 298 /* mkdir <path> [mode] [owner] [group] */ 299 300 if (nargs >= 3) { 301 mode = strtoul(args[2], 0, 8); 302 } 303 304 ret = make_dir(args[1], mode); 305 /* chmod in case the directory already exists */ 306 if (ret == -1 && errno == EEXIST) { 307 ret = _chmod(args[1], mode); 308 } 309 if (ret == -1) { 310 return -errno; 311 } 312 313 if (nargs >= 4) { 314 uid_t uid = decode_uid(args[3]); 315 gid_t gid = -1; 316 317 if (nargs == 5) { 318 gid = decode_uid(args[4]); 319 } 320 321 if (_chown(args[1], uid, gid) < 0) { 322 return -errno; 323 } 324 325 /* chown may have cleared S_ISUID and S_ISGID, chmod again */ 326 if (mode & (S_ISUID | S_ISGID)) { 327 ret = _chmod(args[1], mode); 328 if (ret == -1) { 329 return -errno; 330 } 331 } 332 } 333 334 return 0; 335} 336 337static struct { 338 const char *name; 339 unsigned flag; 340} mount_flags[] = { 341 { "noatime", MS_NOATIME }, 342 { "noexec", MS_NOEXEC }, 343 { "nosuid", MS_NOSUID }, 344 { "nodev", MS_NODEV }, 345 { "nodiratime", MS_NODIRATIME }, 346 { "ro", MS_RDONLY }, 347 { "rw", 0 }, 348 { "remount", MS_REMOUNT }, 349 { "bind", MS_BIND }, 350 { "rec", MS_REC }, 351 { "unbindable", MS_UNBINDABLE }, 352 { "private", MS_PRIVATE }, 353 { "slave", MS_SLAVE }, 354 { "shared", MS_SHARED }, 355 { "defaults", 0 }, 356 { 0, 0 }, 357}; 358 359#define DATA_MNT_POINT "/data" 360 361/* mount <type> <device> <path> <flags ...> <options> */ 362int do_mount(int nargs, char **args) 363{ 364 char tmp[64]; 365 char *source, *target, *system; 366 char *options = NULL; 367 unsigned flags = 0; 368 int n, i; 369 int wait = 0; 370 371 for (n = 4; n < nargs; n++) { 372 for (i = 0; mount_flags[i].name; i++) { 373 if (!strcmp(args[n], mount_flags[i].name)) { 374 flags |= mount_flags[i].flag; 375 break; 376 } 377 } 378 379 if (!mount_flags[i].name) { 380 if (!strcmp(args[n], "wait")) 381 wait = 1; 382 /* if our last argument isn't a flag, wolf it up as an option string */ 383 else if (n + 1 == nargs) 384 options = args[n]; 385 } 386 } 387 388 system = args[1]; 389 source = args[2]; 390 target = args[3]; 391 392 if (!strncmp(source, "mtd@", 4)) { 393 n = mtd_name_to_number(source + 4); 394 if (n < 0) { 395 return -1; 396 } 397 398 sprintf(tmp, "/dev/block/mtdblock%d", n); 399 400 if (wait) 401 wait_for_file(tmp, COMMAND_RETRY_TIMEOUT); 402 if (mount(tmp, target, system, flags, options) < 0) { 403 return -1; 404 } 405 406 goto exit_success; 407 } else if (!strncmp(source, "loop@", 5)) { 408 int mode, loop, fd; 409 struct loop_info info; 410 411 mode = (flags & MS_RDONLY) ? O_RDONLY : O_RDWR; 412 fd = open(source + 5, mode); 413 if (fd < 0) { 414 return -1; 415 } 416 417 for (n = 0; ; n++) { 418 sprintf(tmp, "/dev/block/loop%d", n); 419 loop = open(tmp, mode); 420 if (loop < 0) { 421 return -1; 422 } 423 424 /* if it is a blank loop device */ 425 if (ioctl(loop, LOOP_GET_STATUS, &info) < 0 && errno == ENXIO) { 426 /* if it becomes our loop device */ 427 if (ioctl(loop, LOOP_SET_FD, fd) >= 0) { 428 close(fd); 429 430 if (mount(tmp, target, system, flags, options) < 0) { 431 ioctl(loop, LOOP_CLR_FD, 0); 432 close(loop); 433 return -1; 434 } 435 436 close(loop); 437 goto exit_success; 438 } 439 } 440 441 close(loop); 442 } 443 444 close(fd); 445 ERROR("out of loopback devices"); 446 return -1; 447 } else { 448 if (wait) 449 wait_for_file(source, COMMAND_RETRY_TIMEOUT); 450 if (mount(source, target, system, flags, options) < 0) { 451 return -1; 452 } 453 454 } 455 456exit_success: 457 return 0; 458 459} 460 461int do_mount_all(int nargs, char **args) 462{ 463 pid_t pid; 464 int ret = -1; 465 int child_ret = -1; 466 int status; 467 const char *prop; 468 struct fstab *fstab; 469 470 if (nargs != 2) { 471 return -1; 472 } 473 474 /* 475 * Call fs_mgr_mount_all() to mount all filesystems. We fork(2) and 476 * do the call in the child to provide protection to the main init 477 * process if anything goes wrong (crash or memory leak), and wait for 478 * the child to finish in the parent. 479 */ 480 pid = fork(); 481 if (pid > 0) { 482 /* Parent. Wait for the child to return */ 483 waitpid(pid, &status, 0); 484 if (WIFEXITED(status)) { 485 ret = WEXITSTATUS(status); 486 } else { 487 ret = -1; 488 } 489 } else if (pid == 0) { 490 /* child, call fs_mgr_mount_all() */ 491 klog_set_level(6); /* So we can see what fs_mgr_mount_all() does */ 492 fstab = fs_mgr_read_fstab(args[1]); 493 child_ret = fs_mgr_mount_all(fstab); 494 fs_mgr_free_fstab(fstab); 495 if (child_ret == -1) { 496 ERROR("fs_mgr_mount_all returned an error\n"); 497 } 498 exit(child_ret); 499 } else { 500 /* fork failed, return an error */ 501 return -1; 502 } 503 504 /* ret is 1 if the device is encrypted, 0 if not, and -1 on error */ 505 if (ret == 1) { 506 property_set("ro.crypto.state", "encrypted"); 507 property_set("vold.decrypt", "1"); 508 } else if (ret == 0) { 509 property_set("ro.crypto.state", "unencrypted"); 510 /* If fs_mgr determined this is an unencrypted device, then trigger 511 * that action. 512 */ 513 action_for_each_trigger("nonencrypted", action_add_queue_tail); 514 } 515 516 return ret; 517} 518 519int do_selinux_reload(int nargs, char **args) { 520 if (is_selinux_enabled() <= 0) 521 return 0; 522 return selinux_reload_policy(); 523} 524 525int do_setcon(int nargs, char **args) { 526 if (is_selinux_enabled() <= 0) 527 return 0; 528 if (setcon(args[1]) < 0) { 529 return -errno; 530 } 531 return 0; 532} 533 534int do_setenforce(int nargs, char **args) { 535 if (is_selinux_enabled() <= 0) 536 return 0; 537 if (security_setenforce(atoi(args[1])) < 0) { 538 return -errno; 539 } 540 return 0; 541} 542 543int do_setkey(int nargs, char **args) 544{ 545 struct kbentry kbe; 546 kbe.kb_table = strtoul(args[1], 0, 0); 547 kbe.kb_index = strtoul(args[2], 0, 0); 548 kbe.kb_value = strtoul(args[3], 0, 0); 549 return setkey(&kbe); 550} 551 552int do_setprop(int nargs, char **args) 553{ 554 const char *name = args[1]; 555 const char *value = args[2]; 556 char prop_val[PROP_VALUE_MAX]; 557 int ret; 558 559 ret = expand_props(prop_val, value, sizeof(prop_val)); 560 if (ret) { 561 ERROR("cannot expand '%s' while assigning to '%s'\n", value, name); 562 return -EINVAL; 563 } 564 property_set(name, prop_val); 565 return 0; 566} 567 568int do_setrlimit(int nargs, char **args) 569{ 570 struct rlimit limit; 571 int resource; 572 resource = atoi(args[1]); 573 limit.rlim_cur = atoi(args[2]); 574 limit.rlim_max = atoi(args[3]); 575 return setrlimit(resource, &limit); 576} 577 578int do_start(int nargs, char **args) 579{ 580 struct service *svc; 581 svc = service_find_by_name(args[1]); 582 if (svc) { 583 service_start(svc, NULL); 584 } 585 return 0; 586} 587 588int do_stop(int nargs, char **args) 589{ 590 struct service *svc; 591 svc = service_find_by_name(args[1]); 592 if (svc) { 593 service_stop(svc); 594 } 595 return 0; 596} 597 598int do_restart(int nargs, char **args) 599{ 600 struct service *svc; 601 svc = service_find_by_name(args[1]); 602 if (svc) { 603 service_stop(svc); 604 service_start(svc, NULL); 605 } 606 return 0; 607} 608 609int do_powerctl(int nargs, char **args) 610{ 611 char command[PROP_VALUE_MAX]; 612 int res; 613 int len = 0; 614 int cmd = 0; 615 char *reboot_target; 616 617 res = expand_props(command, args[1], sizeof(command)); 618 if (res) { 619 ERROR("powerctl: cannot expand '%s'\n", args[1]); 620 return -EINVAL; 621 } 622 623 if (strncmp(command, "shutdown", 8) == 0) { 624 cmd = ANDROID_RB_POWEROFF; 625 len = 8; 626 } else if (strncmp(command, "reboot", 6) == 0) { 627 cmd = ANDROID_RB_RESTART2; 628 len = 6; 629 } else { 630 ERROR("powerctl: unrecognized command '%s'\n", command); 631 return -EINVAL; 632 } 633 634 if (command[len] == ',') { 635 reboot_target = &command[len + 1]; 636 } else if (command[len] == '\0') { 637 reboot_target = ""; 638 } else { 639 ERROR("powerctl: unrecognized reboot target '%s'\n", &command[len]); 640 return -EINVAL; 641 } 642 643 return android_reboot(cmd, 0, reboot_target); 644} 645 646int do_trigger(int nargs, char **args) 647{ 648 action_for_each_trigger(args[1], action_add_queue_tail); 649 return 0; 650} 651 652int do_symlink(int nargs, char **args) 653{ 654 return symlink(args[1], args[2]); 655} 656 657int do_rm(int nargs, char **args) 658{ 659 return unlink(args[1]); 660} 661 662int do_rmdir(int nargs, char **args) 663{ 664 return rmdir(args[1]); 665} 666 667int do_sysclktz(int nargs, char **args) 668{ 669 struct timezone tz; 670 671 if (nargs != 2) 672 return -1; 673 674 memset(&tz, 0, sizeof(tz)); 675 tz.tz_minuteswest = atoi(args[1]); 676 if (settimeofday(NULL, &tz)) 677 return -1; 678 return 0; 679} 680 681int do_write(int nargs, char **args) 682{ 683 const char *path = args[1]; 684 const char *value = args[2]; 685 char prop_val[PROP_VALUE_MAX]; 686 int ret; 687 688 ret = expand_props(prop_val, value, sizeof(prop_val)); 689 if (ret) { 690 ERROR("cannot expand '%s' while writing to '%s'\n", value, path); 691 return -EINVAL; 692 } 693 return write_file(path, prop_val); 694} 695 696int do_copy(int nargs, char **args) 697{ 698 char *buffer = NULL; 699 int rc = 0; 700 int fd1 = -1, fd2 = -1; 701 struct stat info; 702 int brtw, brtr; 703 char *p; 704 705 if (nargs != 3) 706 return -1; 707 708 if (stat(args[1], &info) < 0) 709 return -1; 710 711 if ((fd1 = open(args[1], O_RDONLY)) < 0) 712 goto out_err; 713 714 if ((fd2 = open(args[2], O_WRONLY|O_CREAT|O_TRUNC, 0660)) < 0) 715 goto out_err; 716 717 if (!(buffer = malloc(info.st_size))) 718 goto out_err; 719 720 p = buffer; 721 brtr = info.st_size; 722 while(brtr) { 723 rc = read(fd1, p, brtr); 724 if (rc < 0) 725 goto out_err; 726 if (rc == 0) 727 break; 728 p += rc; 729 brtr -= rc; 730 } 731 732 p = buffer; 733 brtw = info.st_size; 734 while(brtw) { 735 rc = write(fd2, p, brtw); 736 if (rc < 0) 737 goto out_err; 738 if (rc == 0) 739 break; 740 p += rc; 741 brtw -= rc; 742 } 743 744 rc = 0; 745 goto out; 746out_err: 747 rc = -1; 748out: 749 if (buffer) 750 free(buffer); 751 if (fd1 >= 0) 752 close(fd1); 753 if (fd2 >= 0) 754 close(fd2); 755 return rc; 756} 757 758int do_chown(int nargs, char **args) { 759 /* GID is optional. */ 760 if (nargs == 3) { 761 if (_chown(args[2], decode_uid(args[1]), -1) < 0) 762 return -errno; 763 } else if (nargs == 4) { 764 if (_chown(args[3], decode_uid(args[1]), decode_uid(args[2])) < 0) 765 return -errno; 766 } else { 767 return -1; 768 } 769 return 0; 770} 771 772static mode_t get_mode(const char *s) { 773 mode_t mode = 0; 774 while (*s) { 775 if (*s >= '0' && *s <= '7') { 776 mode = (mode<<3) | (*s-'0'); 777 } else { 778 return -1; 779 } 780 s++; 781 } 782 return mode; 783} 784 785int do_chmod(int nargs, char **args) { 786 mode_t mode = get_mode(args[1]); 787 if (_chmod(args[2], mode) < 0) { 788 return -errno; 789 } 790 return 0; 791} 792 793int do_restorecon(int nargs, char **args) { 794 int i; 795 796 for (i = 1; i < nargs; i++) { 797 if (restorecon(args[i]) < 0) 798 return -errno; 799 } 800 return 0; 801} 802 803int do_setsebool(int nargs, char **args) { 804 const char *name = args[1]; 805 const char *value = args[2]; 806 SELboolean b; 807 int ret; 808 809 if (is_selinux_enabled() <= 0) 810 return 0; 811 812 b.name = name; 813 if (!strcmp(value, "1") || !strcasecmp(value, "true") || !strcasecmp(value, "on")) 814 b.value = 1; 815 else if (!strcmp(value, "0") || !strcasecmp(value, "false") || !strcasecmp(value, "off")) 816 b.value = 0; 817 else { 818 ERROR("setsebool: invalid value %s\n", value); 819 return -EINVAL; 820 } 821 822 if (security_set_boolean_list(1, &b, 0) < 0) { 823 ret = -errno; 824 ERROR("setsebool: could not set %s to %s\n", name, value); 825 return ret; 826 } 827 828 return 0; 829} 830 831int do_loglevel(int nargs, char **args) { 832 if (nargs == 2) { 833 klog_set_level(atoi(args[1])); 834 return 0; 835 } 836 return -1; 837} 838 839int do_load_persist_props(int nargs, char **args) { 840 if (nargs == 1) { 841 load_persist_props(); 842 return 0; 843 } 844 return -1; 845} 846 847int do_wait(int nargs, char **args) 848{ 849 if (nargs == 2) { 850 return wait_for_file(args[1], COMMAND_RETRY_TIMEOUT); 851 } else if (nargs == 3) { 852 return wait_for_file(args[1], atoi(args[2])); 853 } else 854 return -1; 855} 856