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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 
35 #include <selinux/selinux.h>
36 #include <selinux/label.h>
37 #include <selinux/android.h>
38 
39 #include <libgen.h>
40 
41 #include <cutils/list.h>
42 #include <cutils/sockets.h>
43 #include <cutils/iosched_policy.h>
44 #include <private/android_filesystem_config.h>
45 #include <termios.h>
46 
47 #include <sys/system_properties.h>
48 
49 #include "devices.h"
50 #include "init.h"
51 #include "log.h"
52 #include "property_service.h"
53 #include "bootchart.h"
54 #include "signal_handler.h"
55 #include "keychords.h"
56 #include "init_parser.h"
57 #include "util.h"
58 #include "ueventd.h"
59 #include "watchdogd.h"
60 
61 struct selabel_handle *sehandle;
62 struct selabel_handle *sehandle_prop;
63 
64 static int property_triggers_enabled = 0;
65 
66 #if BOOTCHART
67 static int   bootchart_count;
68 #endif
69 
70 static char console[32];
71 static char bootmode[32];
72 static char hardware[32];
73 static unsigned revision = 0;
74 static char qemu[32];
75 
76 static int selinux_enabled = 1;
77 
78 static struct action *cur_action = NULL;
79 static struct command *cur_command = NULL;
80 static struct listnode *command_queue = NULL;
81 
notify_service_state(const char * name,const char * state)82 void notify_service_state(const char *name, const char *state)
83 {
84     char pname[PROP_NAME_MAX];
85     int len = strlen(name);
86     if ((len + 10) > PROP_NAME_MAX)
87         return;
88     snprintf(pname, sizeof(pname), "init.svc.%s", name);
89     property_set(pname, state);
90 }
91 
92 static int have_console;
93 static char *console_name = "/dev/console";
94 static time_t process_needs_restart;
95 
96 static const char *ENV[32];
97 
98 /* add_environment - add "key=value" to the current environment */
add_environment(const char * key,const char * val)99 int add_environment(const char *key, const char *val)
100 {
101     int n;
102 
103     for (n = 0; n < 31; n++) {
104         if (!ENV[n]) {
105             size_t len = strlen(key) + strlen(val) + 2;
106             char *entry = malloc(len);
107             snprintf(entry, len, "%s=%s", key, val);
108             ENV[n] = entry;
109             return 0;
110         }
111     }
112 
113     return 1;
114 }
115 
zap_stdio(void)116 static void zap_stdio(void)
117 {
118     int fd;
119     fd = open("/dev/null", O_RDWR);
120     dup2(fd, 0);
121     dup2(fd, 1);
122     dup2(fd, 2);
123     close(fd);
124 }
125 
open_console()126 static void open_console()
127 {
128     int fd;
129     if ((fd = open(console_name, O_RDWR)) < 0) {
130         fd = open("/dev/null", O_RDWR);
131     }
132     ioctl(fd, TIOCSCTTY, 0);
133     dup2(fd, 0);
134     dup2(fd, 1);
135     dup2(fd, 2);
136     close(fd);
137 }
138 
publish_socket(const char * name,int fd)139 static void publish_socket(const char *name, int fd)
140 {
141     char key[64] = ANDROID_SOCKET_ENV_PREFIX;
142     char val[64];
143 
144     strlcpy(key + sizeof(ANDROID_SOCKET_ENV_PREFIX) - 1,
145             name,
146             sizeof(key) - sizeof(ANDROID_SOCKET_ENV_PREFIX));
147     snprintf(val, sizeof(val), "%d", fd);
148     add_environment(key, val);
149 
150     /* make sure we don't close-on-exec */
151     fcntl(fd, F_SETFD, 0);
152 }
153 
service_start(struct service * svc,const char * dynamic_args)154 void service_start(struct service *svc, const char *dynamic_args)
155 {
156     struct stat s;
157     pid_t pid;
158     int needs_console;
159     int n;
160     char *scon = NULL;
161     int rc;
162 
163         /* starting a service removes it from the disabled or reset
164          * state and immediately takes it out of the restarting
165          * state if it was in there
166          */
167     svc->flags &= (~(SVC_DISABLED|SVC_RESTARTING|SVC_RESET));
168     svc->time_started = 0;
169 
170         /* running processes require no additional work -- if
171          * they're in the process of exiting, we've ensured
172          * that they will immediately restart on exit, unless
173          * they are ONESHOT
174          */
175     if (svc->flags & SVC_RUNNING) {
176         return;
177     }
178 
179     needs_console = (svc->flags & SVC_CONSOLE) ? 1 : 0;
180     if (needs_console && (!have_console)) {
181         ERROR("service '%s' requires console\n", svc->name);
182         svc->flags |= SVC_DISABLED;
183         return;
184     }
185 
186     if (stat(svc->args[0], &s) != 0) {
187         ERROR("cannot find '%s', disabling '%s'\n", svc->args[0], svc->name);
188         svc->flags |= SVC_DISABLED;
189         return;
190     }
191 
192     if ((!(svc->flags & SVC_ONESHOT)) && dynamic_args) {
193         ERROR("service '%s' must be one-shot to use dynamic args, disabling\n",
194                svc->args[0]);
195         svc->flags |= SVC_DISABLED;
196         return;
197     }
198 
199     if (is_selinux_enabled() > 0) {
200         if (svc->seclabel) {
201             scon = strdup(svc->seclabel);
202             if (!scon) {
203                 ERROR("Out of memory while starting '%s'\n", svc->name);
204                 return;
205             }
206         } else {
207             char *mycon = NULL, *fcon = NULL;
208 
209             INFO("computing context for service '%s'\n", svc->args[0]);
210             rc = getcon(&mycon);
211             if (rc < 0) {
212                 ERROR("could not get context while starting '%s'\n", svc->name);
213                 return;
214             }
215 
216             rc = getfilecon(svc->args[0], &fcon);
217             if (rc < 0) {
218                 ERROR("could not get context while starting '%s'\n", svc->name);
219                 freecon(mycon);
220                 return;
221             }
222 
223             rc = security_compute_create(mycon, fcon, string_to_security_class("process"), &scon);
224             freecon(mycon);
225             freecon(fcon);
226             if (rc < 0) {
227                 ERROR("could not get context while starting '%s'\n", svc->name);
228                 return;
229             }
230         }
231     }
232 
233     NOTICE("starting '%s'\n", svc->name);
234 
235     pid = fork();
236 
237     if (pid == 0) {
238         struct socketinfo *si;
239         struct svcenvinfo *ei;
240         char tmp[32];
241         int fd, sz;
242 
243         umask(077);
244         if (properties_inited()) {
245             get_property_workspace(&fd, &sz);
246             sprintf(tmp, "%d,%d", dup(fd), sz);
247             add_environment("ANDROID_PROPERTY_WORKSPACE", tmp);
248         }
249 
250         for (ei = svc->envvars; ei; ei = ei->next)
251             add_environment(ei->name, ei->value);
252 
253         setsockcreatecon(scon);
254 
255         for (si = svc->sockets; si; si = si->next) {
256             int socket_type = (
257                     !strcmp(si->type, "stream") ? SOCK_STREAM :
258                         (!strcmp(si->type, "dgram") ? SOCK_DGRAM : SOCK_SEQPACKET));
259             int s = create_socket(si->name, socket_type,
260                                   si->perm, si->uid, si->gid);
261             if (s >= 0) {
262                 publish_socket(si->name, s);
263             }
264         }
265 
266         freecon(scon);
267         scon = NULL;
268         setsockcreatecon(NULL);
269 
270         if (svc->ioprio_class != IoSchedClass_NONE) {
271             if (android_set_ioprio(getpid(), svc->ioprio_class, svc->ioprio_pri)) {
272                 ERROR("Failed to set pid %d ioprio = %d,%d: %s\n",
273                       getpid(), svc->ioprio_class, svc->ioprio_pri, strerror(errno));
274             }
275         }
276 
277         if (needs_console) {
278             setsid();
279             open_console();
280         } else {
281             zap_stdio();
282         }
283 
284 #if 0
285         for (n = 0; svc->args[n]; n++) {
286             INFO("args[%d] = '%s'\n", n, svc->args[n]);
287         }
288         for (n = 0; ENV[n]; n++) {
289             INFO("env[%d] = '%s'\n", n, ENV[n]);
290         }
291 #endif
292 
293         setpgid(0, getpid());
294 
295     /* as requested, set our gid, supplemental gids, and uid */
296         if (svc->gid) {
297             if (setgid(svc->gid) != 0) {
298                 ERROR("setgid failed: %s\n", strerror(errno));
299                 _exit(127);
300             }
301         }
302         if (svc->nr_supp_gids) {
303             if (setgroups(svc->nr_supp_gids, svc->supp_gids) != 0) {
304                 ERROR("setgroups failed: %s\n", strerror(errno));
305                 _exit(127);
306             }
307         }
308         if (svc->uid) {
309             if (setuid(svc->uid) != 0) {
310                 ERROR("setuid failed: %s\n", strerror(errno));
311                 _exit(127);
312             }
313         }
314         if (svc->seclabel) {
315             if (is_selinux_enabled() > 0 && setexeccon(svc->seclabel) < 0) {
316                 ERROR("cannot setexeccon('%s'): %s\n", svc->seclabel, strerror(errno));
317                 _exit(127);
318             }
319         }
320 
321         if (!dynamic_args) {
322             if (execve(svc->args[0], (char**) svc->args, (char**) ENV) < 0) {
323                 ERROR("cannot execve('%s'): %s\n", svc->args[0], strerror(errno));
324             }
325         } else {
326             char *arg_ptrs[INIT_PARSER_MAXARGS+1];
327             int arg_idx = svc->nargs;
328             char *tmp = strdup(dynamic_args);
329             char *next = tmp;
330             char *bword;
331 
332             /* Copy the static arguments */
333             memcpy(arg_ptrs, svc->args, (svc->nargs * sizeof(char *)));
334 
335             while((bword = strsep(&next, " "))) {
336                 arg_ptrs[arg_idx++] = bword;
337                 if (arg_idx == INIT_PARSER_MAXARGS)
338                     break;
339             }
340             arg_ptrs[arg_idx] = '\0';
341             execve(svc->args[0], (char**) arg_ptrs, (char**) ENV);
342         }
343         _exit(127);
344     }
345 
346     freecon(scon);
347 
348     if (pid < 0) {
349         ERROR("failed to start '%s'\n", svc->name);
350         svc->pid = 0;
351         return;
352     }
353 
354     svc->time_started = gettime();
355     svc->pid = pid;
356     svc->flags |= SVC_RUNNING;
357 
358     if (properties_inited())
359         notify_service_state(svc->name, "running");
360 }
361 
362 /* The how field should be either SVC_DISABLED or SVC_RESET */
service_stop_or_reset(struct service * svc,int how)363 static void service_stop_or_reset(struct service *svc, int how)
364 {
365         /* we are no longer running, nor should we
366          * attempt to restart
367          */
368     svc->flags &= (~(SVC_RUNNING|SVC_RESTARTING));
369 
370     if ((how != SVC_DISABLED) && (how != SVC_RESET)) {
371         /* Hrm, an illegal flag.  Default to SVC_DISABLED */
372         how = SVC_DISABLED;
373     }
374         /* if the service has not yet started, prevent
375          * it from auto-starting with its class
376          */
377     if (how == SVC_RESET) {
378         svc->flags |= (svc->flags & SVC_RC_DISABLED) ? SVC_DISABLED : SVC_RESET;
379     } else {
380         svc->flags |= how;
381     }
382 
383     if (svc->pid) {
384         NOTICE("service '%s' is being killed\n", svc->name);
385         kill(-svc->pid, SIGKILL);
386         notify_service_state(svc->name, "stopping");
387     } else {
388         notify_service_state(svc->name, "stopped");
389     }
390 }
391 
service_reset(struct service * svc)392 void service_reset(struct service *svc)
393 {
394     service_stop_or_reset(svc, SVC_RESET);
395 }
396 
service_stop(struct service * svc)397 void service_stop(struct service *svc)
398 {
399     service_stop_or_reset(svc, SVC_DISABLED);
400 }
401 
property_changed(const char * name,const char * value)402 void property_changed(const char *name, const char *value)
403 {
404     if (property_triggers_enabled)
405         queue_property_triggers(name, value);
406 }
407 
restart_service_if_needed(struct service * svc)408 static void restart_service_if_needed(struct service *svc)
409 {
410     time_t next_start_time = svc->time_started + 5;
411 
412     if (next_start_time <= gettime()) {
413         svc->flags &= (~SVC_RESTARTING);
414         service_start(svc, NULL);
415         return;
416     }
417 
418     if ((next_start_time < process_needs_restart) ||
419         (process_needs_restart == 0)) {
420         process_needs_restart = next_start_time;
421     }
422 }
423 
restart_processes()424 static void restart_processes()
425 {
426     process_needs_restart = 0;
427     service_for_each_flags(SVC_RESTARTING,
428                            restart_service_if_needed);
429 }
430 
msg_start(const char * name)431 static void msg_start(const char *name)
432 {
433     struct service *svc;
434     char *tmp = NULL;
435     char *args = NULL;
436 
437     if (!strchr(name, ':'))
438         svc = service_find_by_name(name);
439     else {
440         tmp = strdup(name);
441         args = strchr(tmp, ':');
442         *args = '\0';
443         args++;
444 
445         svc = service_find_by_name(tmp);
446     }
447 
448     if (svc) {
449         service_start(svc, args);
450     } else {
451         ERROR("no such service '%s'\n", name);
452     }
453     if (tmp)
454         free(tmp);
455 }
456 
msg_stop(const char * name)457 static void msg_stop(const char *name)
458 {
459     struct service *svc = service_find_by_name(name);
460 
461     if (svc) {
462         service_stop(svc);
463     } else {
464         ERROR("no such service '%s'\n", name);
465     }
466 }
467 
handle_control_message(const char * msg,const char * arg)468 void handle_control_message(const char *msg, const char *arg)
469 {
470     if (!strcmp(msg,"start")) {
471         msg_start(arg);
472     } else if (!strcmp(msg,"stop")) {
473         msg_stop(arg);
474     } else if (!strcmp(msg,"restart")) {
475         msg_stop(arg);
476         msg_start(arg);
477     } else {
478         ERROR("unknown control msg '%s'\n", msg);
479     }
480 }
481 
get_first_command(struct action * act)482 static struct command *get_first_command(struct action *act)
483 {
484     struct listnode *node;
485     node = list_head(&act->commands);
486     if (!node || list_empty(&act->commands))
487         return NULL;
488 
489     return node_to_item(node, struct command, clist);
490 }
491 
get_next_command(struct action * act,struct command * cmd)492 static struct command *get_next_command(struct action *act, struct command *cmd)
493 {
494     struct listnode *node;
495     node = cmd->clist.next;
496     if (!node)
497         return NULL;
498     if (node == &act->commands)
499         return NULL;
500 
501     return node_to_item(node, struct command, clist);
502 }
503 
is_last_command(struct action * act,struct command * cmd)504 static int is_last_command(struct action *act, struct command *cmd)
505 {
506     return (list_tail(&act->commands) == &cmd->clist);
507 }
508 
execute_one_command(void)509 void execute_one_command(void)
510 {
511     int ret;
512 
513     if (!cur_action || !cur_command || is_last_command(cur_action, cur_command)) {
514         cur_action = action_remove_queue_head();
515         cur_command = NULL;
516         if (!cur_action)
517             return;
518         INFO("processing action %p (%s)\n", cur_action, cur_action->name);
519         cur_command = get_first_command(cur_action);
520     } else {
521         cur_command = get_next_command(cur_action, cur_command);
522     }
523 
524     if (!cur_command)
525         return;
526 
527     ret = cur_command->func(cur_command->nargs, cur_command->args);
528     INFO("command '%s' r=%d\n", cur_command->args[0], ret);
529 }
530 
wait_for_coldboot_done_action(int nargs,char ** args)531 static int wait_for_coldboot_done_action(int nargs, char **args)
532 {
533     int ret;
534     INFO("wait for %s\n", coldboot_done);
535     ret = wait_for_file(coldboot_done, COMMAND_RETRY_TIMEOUT);
536     if (ret)
537         ERROR("Timed out waiting for %s\n", coldboot_done);
538     return ret;
539 }
540 
keychord_init_action(int nargs,char ** args)541 static int keychord_init_action(int nargs, char **args)
542 {
543     keychord_init();
544     return 0;
545 }
546 
console_init_action(int nargs,char ** args)547 static int console_init_action(int nargs, char **args)
548 {
549     int fd;
550     char tmp[PROP_VALUE_MAX];
551 
552     if (console[0]) {
553         snprintf(tmp, sizeof(tmp), "/dev/%s", console);
554         console_name = strdup(tmp);
555     }
556 
557     fd = open(console_name, O_RDWR);
558     if (fd >= 0)
559         have_console = 1;
560     close(fd);
561 
562     if( load_565rle_image(INIT_IMAGE_FILE) ) {
563         fd = open("/dev/tty0", O_WRONLY);
564         if (fd >= 0) {
565             const char *msg;
566                 msg = "\n"
567             "\n"
568             "\n"
569             "\n"
570             "\n"
571             "\n"
572             "\n"  // console is 40 cols x 30 lines
573             "\n"
574             "\n"
575             "\n"
576             "\n"
577             "\n"
578             "\n"
579             "\n"
580             "             A N D R O I D ";
581             write(fd, msg, strlen(msg));
582             close(fd);
583         }
584     }
585     return 0;
586 }
587 
import_kernel_nv(char * name,int for_emulator)588 static void import_kernel_nv(char *name, int for_emulator)
589 {
590     char *value = strchr(name, '=');
591     int name_len = strlen(name);
592 
593     if (value == 0) return;
594     *value++ = 0;
595     if (name_len == 0) return;
596 
597     if (!strcmp(name,"selinux")) {
598         selinux_enabled = atoi(value);
599     }
600 
601     if (for_emulator) {
602         /* in the emulator, export any kernel option with the
603          * ro.kernel. prefix */
604         char buff[PROP_NAME_MAX];
605         int len = snprintf( buff, sizeof(buff), "ro.kernel.%s", name );
606 
607         if (len < (int)sizeof(buff))
608             property_set( buff, value );
609         return;
610     }
611 
612     if (!strcmp(name,"qemu")) {
613         strlcpy(qemu, value, sizeof(qemu));
614     } else if (!strncmp(name, "androidboot.", 12) && name_len > 12) {
615         const char *boot_prop_name = name + 12;
616         char prop[PROP_NAME_MAX];
617         int cnt;
618 
619         cnt = snprintf(prop, sizeof(prop), "ro.boot.%s", boot_prop_name);
620         if (cnt < PROP_NAME_MAX)
621             property_set(prop, value);
622     }
623 }
624 
export_kernel_boot_props(void)625 static void export_kernel_boot_props(void)
626 {
627     char tmp[PROP_VALUE_MAX];
628     const char *pval;
629     unsigned i;
630     struct {
631         const char *src_prop;
632         const char *dest_prop;
633         const char *def_val;
634     } prop_map[] = {
635         { "ro.boot.serialno", "ro.serialno", "", },
636         { "ro.boot.mode", "ro.bootmode", "unknown", },
637         { "ro.boot.baseband", "ro.baseband", "unknown", },
638         { "ro.boot.bootloader", "ro.bootloader", "unknown", },
639     };
640 
641     for (i = 0; i < ARRAY_SIZE(prop_map); i++) {
642         pval = property_get(prop_map[i].src_prop);
643         property_set(prop_map[i].dest_prop, pval ?: prop_map[i].def_val);
644     }
645 
646     pval = property_get("ro.boot.console");
647     if (pval)
648         strlcpy(console, pval, sizeof(console));
649 
650     /* save a copy for init's usage during boot */
651     strlcpy(bootmode, property_get("ro.bootmode"), sizeof(bootmode));
652 
653     /* if this was given on kernel command line, override what we read
654      * before (e.g. from /proc/cpuinfo), if anything */
655     pval = property_get("ro.boot.hardware");
656     if (pval)
657         strlcpy(hardware, pval, sizeof(hardware));
658     property_set("ro.hardware", hardware);
659 
660     snprintf(tmp, PROP_VALUE_MAX, "%d", revision);
661     property_set("ro.revision", tmp);
662 
663     /* TODO: these are obsolete. We should delete them */
664     if (!strcmp(bootmode,"factory"))
665         property_set("ro.factorytest", "1");
666     else if (!strcmp(bootmode,"factory2"))
667         property_set("ro.factorytest", "2");
668     else
669         property_set("ro.factorytest", "0");
670 }
671 
process_kernel_cmdline(void)672 static void process_kernel_cmdline(void)
673 {
674     /* don't expose the raw commandline to nonpriv processes */
675     chmod("/proc/cmdline", 0440);
676 
677     /* first pass does the common stuff, and finds if we are in qemu.
678      * second pass is only necessary for qemu to export all kernel params
679      * as props.
680      */
681     import_kernel_cmdline(0, import_kernel_nv);
682     if (qemu[0])
683         import_kernel_cmdline(1, import_kernel_nv);
684 
685     /* now propogate the info given on command line to internal variables
686      * used by init as well as the current required properties
687      */
688     export_kernel_boot_props();
689 }
690 
property_service_init_action(int nargs,char ** args)691 static int property_service_init_action(int nargs, char **args)
692 {
693     /* read any property files on system or data and
694      * fire up the property service.  This must happen
695      * after the ro.foo properties are set above so
696      * that /data/local.prop cannot interfere with them.
697      */
698     start_property_service();
699     return 0;
700 }
701 
signal_init_action(int nargs,char ** args)702 static int signal_init_action(int nargs, char **args)
703 {
704     signal_init();
705     return 0;
706 }
707 
check_startup_action(int nargs,char ** args)708 static int check_startup_action(int nargs, char **args)
709 {
710     /* make sure we actually have all the pieces we need */
711     if ((get_property_set_fd() < 0) ||
712         (get_signal_fd() < 0)) {
713         ERROR("init startup failure\n");
714         exit(1);
715     }
716 
717         /* signal that we hit this point */
718     unlink("/dev/.booting");
719 
720     return 0;
721 }
722 
queue_property_triggers_action(int nargs,char ** args)723 static int queue_property_triggers_action(int nargs, char **args)
724 {
725     queue_all_property_triggers();
726     /* enable property triggers */
727     property_triggers_enabled = 1;
728     return 0;
729 }
730 
731 #if BOOTCHART
bootchart_init_action(int nargs,char ** args)732 static int bootchart_init_action(int nargs, char **args)
733 {
734     bootchart_count = bootchart_init();
735     if (bootchart_count < 0) {
736         ERROR("bootcharting init failure\n");
737     } else if (bootchart_count > 0) {
738         NOTICE("bootcharting started (period=%d ms)\n", bootchart_count*BOOTCHART_POLLING_MS);
739     } else {
740         NOTICE("bootcharting ignored\n");
741     }
742 
743     return 0;
744 }
745 #endif
746 
747 static const struct selinux_opt seopts_prop[] = {
748         { SELABEL_OPT_PATH, "/data/security/property_contexts" },
749         { SELABEL_OPT_PATH, "/property_contexts" },
750         { 0, NULL }
751 };
752 
selinux_android_prop_context_handle(void)753 struct selabel_handle* selinux_android_prop_context_handle(void)
754 {
755     int i = 0;
756     struct selabel_handle* sehandle = NULL;
757     while ((sehandle == NULL) && seopts_prop[i].value) {
758         sehandle = selabel_open(SELABEL_CTX_ANDROID_PROP, &seopts_prop[i], 1);
759         i++;
760     }
761 
762     if (!sehandle) {
763         ERROR("SELinux:  Could not load property_contexts:  %s\n",
764               strerror(errno));
765         return NULL;
766     }
767     INFO("SELinux: Loaded property contexts from %s\n", seopts_prop[i - 1].value);
768     return sehandle;
769 }
770 
selinux_init_all_handles(void)771 void selinux_init_all_handles(void)
772 {
773     sehandle = selinux_android_file_context_handle();
774     sehandle_prop = selinux_android_prop_context_handle();
775 }
776 
selinux_reload_policy(void)777 int selinux_reload_policy(void)
778 {
779     if (!selinux_enabled) {
780         return -1;
781     }
782 
783     INFO("SELinux: Attempting to reload policy files\n");
784 
785     if (selinux_android_reload_policy() == -1) {
786         return -1;
787     }
788 
789     if (sehandle)
790         selabel_close(sehandle);
791 
792     if (sehandle_prop)
793         selabel_close(sehandle_prop);
794 
795     selinux_init_all_handles();
796     return 0;
797 }
798 
audit_callback(void * data,security_class_t cls,char * buf,size_t len)799 int audit_callback(void *data, security_class_t cls, char *buf, size_t len)
800 {
801     snprintf(buf, len, "property=%s", !data ? "NULL" : (char *)data);
802     return 0;
803 }
804 
main(int argc,char ** argv)805 int main(int argc, char **argv)
806 {
807     int fd_count = 0;
808     struct pollfd ufds[4];
809     char *tmpdev;
810     char* debuggable;
811     char tmp[32];
812     int property_set_fd_init = 0;
813     int signal_fd_init = 0;
814     int keychord_fd_init = 0;
815     bool is_charger = false;
816 
817     if (!strcmp(basename(argv[0]), "ueventd"))
818         return ueventd_main(argc, argv);
819 
820     if (!strcmp(basename(argv[0]), "watchdogd"))
821         return watchdogd_main(argc, argv);
822 
823     /* clear the umask */
824     umask(0);
825 
826         /* Get the basic filesystem setup we need put
827          * together in the initramdisk on / and then we'll
828          * let the rc file figure out the rest.
829          */
830     mkdir("/dev", 0755);
831     mkdir("/proc", 0755);
832     mkdir("/sys", 0755);
833 
834     mount("tmpfs", "/dev", "tmpfs", MS_NOSUID, "mode=0755");
835     mkdir("/dev/pts", 0755);
836     mkdir("/dev/socket", 0755);
837     mount("devpts", "/dev/pts", "devpts", 0, NULL);
838     mount("proc", "/proc", "proc", 0, NULL);
839     mount("sysfs", "/sys", "sysfs", 0, NULL);
840 
841         /* indicate that booting is in progress to background fw loaders, etc */
842     close(open("/dev/.booting", O_WRONLY | O_CREAT, 0000));
843 
844         /* We must have some place other than / to create the
845          * device nodes for kmsg and null, otherwise we won't
846          * be able to remount / read-only later on.
847          * Now that tmpfs is mounted on /dev, we can actually
848          * talk to the outside world.
849          */
850     open_devnull_stdio();
851     klog_init();
852     property_init();
853 
854     get_hardware_name(hardware, &revision);
855 
856     process_kernel_cmdline();
857 
858     union selinux_callback cb;
859     cb.func_log = klog_write;
860     selinux_set_callback(SELINUX_CB_LOG, cb);
861 
862     cb.func_audit = audit_callback;
863     selinux_set_callback(SELINUX_CB_AUDIT, cb);
864 
865     INFO("loading selinux policy\n");
866     if (selinux_enabled) {
867         if (selinux_android_load_policy() < 0) {
868             selinux_enabled = 0;
869             INFO("SELinux: Disabled due to failed policy load\n");
870         } else {
871             selinux_init_all_handles();
872         }
873     } else {
874         INFO("SELinux:  Disabled by command line option\n");
875     }
876     /* These directories were necessarily created before initial policy load
877      * and therefore need their security context restored to the proper value.
878      * This must happen before /dev is populated by ueventd.
879      */
880     restorecon("/dev");
881     restorecon("/dev/socket");
882     restorecon("/dev/__properties__");
883 
884     is_charger = !strcmp(bootmode, "charger");
885 
886     INFO("property init\n");
887     if (!is_charger)
888         property_load_boot_defaults();
889 
890     INFO("reading config file\n");
891     init_parse_config_file("/init.rc");
892 
893     action_for_each_trigger("early-init", action_add_queue_tail);
894 
895     queue_builtin_action(wait_for_coldboot_done_action, "wait_for_coldboot_done");
896     queue_builtin_action(keychord_init_action, "keychord_init");
897     queue_builtin_action(console_init_action, "console_init");
898 
899     /* execute all the boot actions to get us started */
900     action_for_each_trigger("init", action_add_queue_tail);
901 
902     /* skip mounting filesystems in charger mode */
903     if (!is_charger) {
904         action_for_each_trigger("early-fs", action_add_queue_tail);
905         action_for_each_trigger("fs", action_add_queue_tail);
906         action_for_each_trigger("post-fs", action_add_queue_tail);
907         action_for_each_trigger("post-fs-data", action_add_queue_tail);
908     }
909 
910     queue_builtin_action(property_service_init_action, "property_service_init");
911     queue_builtin_action(signal_init_action, "signal_init");
912     queue_builtin_action(check_startup_action, "check_startup");
913 
914     if (is_charger) {
915         action_for_each_trigger("charger", action_add_queue_tail);
916     } else {
917         action_for_each_trigger("early-boot", action_add_queue_tail);
918         action_for_each_trigger("boot", action_add_queue_tail);
919     }
920 
921         /* run all property triggers based on current state of the properties */
922     queue_builtin_action(queue_property_triggers_action, "queue_property_triggers");
923 
924 
925 #if BOOTCHART
926     queue_builtin_action(bootchart_init_action, "bootchart_init");
927 #endif
928 
929     for(;;) {
930         int nr, i, timeout = -1;
931 
932         execute_one_command();
933         restart_processes();
934 
935         if (!property_set_fd_init && get_property_set_fd() > 0) {
936             ufds[fd_count].fd = get_property_set_fd();
937             ufds[fd_count].events = POLLIN;
938             ufds[fd_count].revents = 0;
939             fd_count++;
940             property_set_fd_init = 1;
941         }
942         if (!signal_fd_init && get_signal_fd() > 0) {
943             ufds[fd_count].fd = get_signal_fd();
944             ufds[fd_count].events = POLLIN;
945             ufds[fd_count].revents = 0;
946             fd_count++;
947             signal_fd_init = 1;
948         }
949         if (!keychord_fd_init && get_keychord_fd() > 0) {
950             ufds[fd_count].fd = get_keychord_fd();
951             ufds[fd_count].events = POLLIN;
952             ufds[fd_count].revents = 0;
953             fd_count++;
954             keychord_fd_init = 1;
955         }
956 
957         if (process_needs_restart) {
958             timeout = (process_needs_restart - gettime()) * 1000;
959             if (timeout < 0)
960                 timeout = 0;
961         }
962 
963         if (!action_queue_empty() || cur_action)
964             timeout = 0;
965 
966 #if BOOTCHART
967         if (bootchart_count > 0) {
968             if (timeout < 0 || timeout > BOOTCHART_POLLING_MS)
969                 timeout = BOOTCHART_POLLING_MS;
970             if (bootchart_step() < 0 || --bootchart_count == 0) {
971                 bootchart_finish();
972                 bootchart_count = 0;
973             }
974         }
975 #endif
976 
977         nr = poll(ufds, fd_count, timeout);
978         if (nr <= 0)
979             continue;
980 
981         for (i = 0; i < fd_count; i++) {
982             if (ufds[i].revents == POLLIN) {
983                 if (ufds[i].fd == get_property_set_fd())
984                     handle_property_set_fd();
985                 else if (ufds[i].fd == get_keychord_fd())
986                     handle_keychord();
987                 else if (ufds[i].fd == get_signal_fd())
988                     handle_signal();
989             }
990         }
991     }
992 
993     return 0;
994 }
995