init.c revision d97d9074ba818de5af45ce4e0f5c30053ae467d0 
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#ifdef HAVE_SELINUX
36#include <sys/mman.h>
37#include <selinux/selinux.h>
38#include <selinux/label.h>
39#endif
40
41#include <libgen.h>
42
43#include <cutils/list.h>
44#include <cutils/sockets.h>
45#include <cutils/iosched_policy.h>
46#include <private/android_filesystem_config.h>
47#include <termios.h>
48
49#include <sys/system_properties.h>
50
51#include "devices.h"
52#include "init.h"
53#include "log.h"
54#include "property_service.h"
55#include "bootchart.h"
56#include "signal_handler.h"
57#include "keychords.h"
58#include "init_parser.h"
59#include "util.h"
60#include "ueventd.h"
61#include "watchdogd.h"
62
63#ifdef HAVE_SELINUX
64struct selabel_handle *sehandle;
65#endif
66
67static int property_triggers_enabled = 0;
68
69#if BOOTCHART
70static int   bootchart_count;
71#endif
72
73static char console[32];
74static char bootmode[32];
75static char hardware[32];
76static unsigned revision = 0;
77static char qemu[32];
78
79#ifdef HAVE_SELINUX
80static int selinux_enabled = 1;
81static int selinux_enforcing = 0;
82#endif
83
84static struct action *cur_action = NULL;
85static struct command *cur_command = NULL;
86static struct listnode *command_queue = NULL;
87
88void notify_service_state(const char *name, const char *state)
89{
90    char pname[PROP_NAME_MAX];
91    int len = strlen(name);
92    if ((len + 10) > PROP_NAME_MAX)
93        return;
94    snprintf(pname, sizeof(pname), "init.svc.%s", name);
95    property_set(pname, state);
96}
97
98static int have_console;
99static char *console_name = "/dev/console";
100static time_t process_needs_restart;
101
102static const char *ENV[32];
103
104/* add_environment - add "key=value" to the current environment */
105int add_environment(const char *key, const char *val)
106{
107    int n;
108
109    for (n = 0; n < 31; n++) {
110        if (!ENV[n]) {
111            size_t len = strlen(key) + strlen(val) + 2;
112            char *entry = malloc(len);
113            snprintf(entry, len, "%s=%s", key, val);
114            ENV[n] = entry;
115            return 0;
116        }
117    }
118
119    return 1;
120}
121
122static void zap_stdio(void)
123{
124    int fd;
125    fd = open("/dev/null", O_RDWR);
126    dup2(fd, 0);
127    dup2(fd, 1);
128    dup2(fd, 2);
129    close(fd);
130}
131
132static void open_console()
133{
134    int fd;
135    if ((fd = open(console_name, O_RDWR)) < 0) {
136        fd = open("/dev/null", O_RDWR);
137    }
138    ioctl(fd, TIOCSCTTY, 0);
139    dup2(fd, 0);
140    dup2(fd, 1);
141    dup2(fd, 2);
142    close(fd);
143}
144
145static void publish_socket(const char *name, int fd)
146{
147    char key[64] = ANDROID_SOCKET_ENV_PREFIX;
148    char val[64];
149
150    strlcpy(key + sizeof(ANDROID_SOCKET_ENV_PREFIX) - 1,
151            name,
152            sizeof(key) - sizeof(ANDROID_SOCKET_ENV_PREFIX));
153    snprintf(val, sizeof(val), "%d", fd);
154    add_environment(key, val);
155
156    /* make sure we don't close-on-exec */
157    fcntl(fd, F_SETFD, 0);
158}
159
160void service_start(struct service *svc, const char *dynamic_args)
161{
162    struct stat s;
163    pid_t pid;
164    int needs_console;
165    int n;
166#ifdef HAVE_SELINUX
167    char *scon = NULL;
168    int rc;
169#endif
170        /* starting a service removes it from the disabled or reset
171         * state and immediately takes it out of the restarting
172         * state if it was in there
173         */
174    svc->flags &= (~(SVC_DISABLED|SVC_RESTARTING|SVC_RESET));
175    svc->time_started = 0;
176
177        /* running processes require no additional work -- if
178         * they're in the process of exiting, we've ensured
179         * that they will immediately restart on exit, unless
180         * they are ONESHOT
181         */
182    if (svc->flags & SVC_RUNNING) {
183        return;
184    }
185
186    needs_console = (svc->flags & SVC_CONSOLE) ? 1 : 0;
187    if (needs_console && (!have_console)) {
188        ERROR("service '%s' requires console\n", svc->name);
189        svc->flags |= SVC_DISABLED;
190        return;
191    }
192
193    if (stat(svc->args[0], &s) != 0) {
194        ERROR("cannot find '%s', disabling '%s'\n", svc->args[0], svc->name);
195        svc->flags |= SVC_DISABLED;
196        return;
197    }
198
199    if ((!(svc->flags & SVC_ONESHOT)) && dynamic_args) {
200        ERROR("service '%s' must be one-shot to use dynamic args, disabling\n",
201               svc->args[0]);
202        svc->flags |= SVC_DISABLED;
203        return;
204    }
205
206#ifdef HAVE_SELINUX
207    if (is_selinux_enabled() > 0) {
208        char *mycon = NULL, *fcon = NULL;
209
210        INFO("computing context for service '%s'\n", svc->args[0]);
211        rc = getcon(&mycon);
212        if (rc < 0) {
213            ERROR("could not get context while starting '%s'\n", svc->name);
214            return;
215        }
216
217        rc = getfilecon(svc->args[0], &fcon);
218        if (rc < 0) {
219            ERROR("could not get context while starting '%s'\n", svc->name);
220            freecon(mycon);
221            return;
222        }
223
224        rc = security_compute_create(mycon, fcon, string_to_security_class("process"), &scon);
225        freecon(mycon);
226        freecon(fcon);
227        if (rc < 0) {
228            ERROR("could not get context while starting '%s'\n", svc->name);
229            return;
230        }
231    }
232#endif
233
234    NOTICE("starting '%s'\n", svc->name);
235
236    pid = fork();
237
238    if (pid == 0) {
239        struct socketinfo *si;
240        struct svcenvinfo *ei;
241        char tmp[32];
242        int fd, sz;
243
244        umask(077);
245        if (properties_inited()) {
246            get_property_workspace(&fd, &sz);
247            sprintf(tmp, "%d,%d", dup(fd), sz);
248            add_environment("ANDROID_PROPERTY_WORKSPACE", tmp);
249        }
250
251        for (ei = svc->envvars; ei; ei = ei->next)
252            add_environment(ei->name, ei->value);
253
254#ifdef HAVE_SELINUX
255        setsockcreatecon(scon);
256#endif
257
258        for (si = svc->sockets; si; si = si->next) {
259            int socket_type = (
260                    !strcmp(si->type, "stream") ? SOCK_STREAM :
261                        (!strcmp(si->type, "dgram") ? SOCK_DGRAM : SOCK_SEQPACKET));
262            int s = create_socket(si->name, socket_type,
263                                  si->perm, si->uid, si->gid);
264            if (s >= 0) {
265                publish_socket(si->name, s);
266            }
267        }
268
269#ifdef HAVE_SELINUX
270        freecon(scon);
271        scon = NULL;
272        setsockcreatecon(NULL);
273#endif
274
275        if (svc->ioprio_class != IoSchedClass_NONE) {
276            if (android_set_ioprio(getpid(), svc->ioprio_class, svc->ioprio_pri)) {
277                ERROR("Failed to set pid %d ioprio = %d,%d: %s\n",
278                      getpid(), svc->ioprio_class, svc->ioprio_pri, strerror(errno));
279            }
280        }
281
282        if (needs_console) {
283            setsid();
284            open_console();
285        } else {
286            zap_stdio();
287        }
288
289#if 0
290        for (n = 0; svc->args[n]; n++) {
291            INFO("args[%d] = '%s'\n", n, svc->args[n]);
292        }
293        for (n = 0; ENV[n]; n++) {
294            INFO("env[%d] = '%s'\n", n, ENV[n]);
295        }
296#endif
297
298        setpgid(0, getpid());
299
300    /* as requested, set our gid, supplemental gids, and uid */
301        if (svc->gid) {
302            if (setgid(svc->gid) != 0) {
303                ERROR("setgid failed: %s\n", strerror(errno));
304                _exit(127);
305            }
306        }
307        if (svc->nr_supp_gids) {
308            if (setgroups(svc->nr_supp_gids, svc->supp_gids) != 0) {
309                ERROR("setgroups failed: %s\n", strerror(errno));
310                _exit(127);
311            }
312        }
313        if (svc->uid) {
314            if (setuid(svc->uid) != 0) {
315                ERROR("setuid failed: %s\n", strerror(errno));
316                _exit(127);
317            }
318        }
319
320#ifdef HAVE_SELINUX
321        if (svc->seclabel) {
322            if (is_selinux_enabled() > 0 && setexeccon(svc->seclabel) < 0) {
323                ERROR("cannot setexeccon('%s'): %s\n", svc->seclabel, strerror(errno));
324                _exit(127);
325            }
326        }
327#endif
328
329        if (!dynamic_args) {
330            if (execve(svc->args[0], (char**) svc->args, (char**) ENV) < 0) {
331                ERROR("cannot execve('%s'): %s\n", svc->args[0], strerror(errno));
332            }
333        } else {
334            char *arg_ptrs[INIT_PARSER_MAXARGS+1];
335            int arg_idx = svc->nargs;
336            char *tmp = strdup(dynamic_args);
337            char *next = tmp;
338            char *bword;
339
340            /* Copy the static arguments */
341            memcpy(arg_ptrs, svc->args, (svc->nargs * sizeof(char *)));
342
343            while((bword = strsep(&next, " "))) {
344                arg_ptrs[arg_idx++] = bword;
345                if (arg_idx == INIT_PARSER_MAXARGS)
346                    break;
347            }
348            arg_ptrs[arg_idx] = '\0';
349            execve(svc->args[0], (char**) arg_ptrs, (char**) ENV);
350        }
351        _exit(127);
352    }
353
354#ifdef HAVE_SELINUX
355    freecon(scon);
356#endif
357
358    if (pid < 0) {
359        ERROR("failed to start '%s'\n", svc->name);
360        svc->pid = 0;
361        return;
362    }
363
364    svc->time_started = gettime();
365    svc->pid = pid;
366    svc->flags |= SVC_RUNNING;
367
368    if (properties_inited())
369        notify_service_state(svc->name, "running");
370}
371
372/* The how field should be either SVC_DISABLED or SVC_RESET */
373static void service_stop_or_reset(struct service *svc, int how)
374{
375        /* we are no longer running, nor should we
376         * attempt to restart
377         */
378    svc->flags &= (~(SVC_RUNNING|SVC_RESTARTING));
379
380    if ((how != SVC_DISABLED) && (how != SVC_RESET)) {
381        /* Hrm, an illegal flag.  Default to SVC_DISABLED */
382        how = SVC_DISABLED;
383    }
384        /* if the service has not yet started, prevent
385         * it from auto-starting with its class
386         */
387    if (how == SVC_RESET) {
388        svc->flags |= (svc->flags & SVC_RC_DISABLED) ? SVC_DISABLED : SVC_RESET;
389    } else {
390        svc->flags |= how;
391    }
392
393    if (svc->pid) {
394        NOTICE("service '%s' is being killed\n", svc->name);
395        kill(-svc->pid, SIGKILL);
396        notify_service_state(svc->name, "stopping");
397    } else {
398        notify_service_state(svc->name, "stopped");
399    }
400}
401
402void service_reset(struct service *svc)
403{
404    service_stop_or_reset(svc, SVC_RESET);
405}
406
407void service_stop(struct service *svc)
408{
409    service_stop_or_reset(svc, SVC_DISABLED);
410}
411
412void property_changed(const char *name, const char *value)
413{
414    if (property_triggers_enabled)
415        queue_property_triggers(name, value);
416}
417
418static void restart_service_if_needed(struct service *svc)
419{
420    time_t next_start_time = svc->time_started + 5;
421
422    if (next_start_time <= gettime()) {
423        svc->flags &= (~SVC_RESTARTING);
424        service_start(svc, NULL);
425        return;
426    }
427
428    if ((next_start_time < process_needs_restart) ||
429        (process_needs_restart == 0)) {
430        process_needs_restart = next_start_time;
431    }
432}
433
434static void restart_processes()
435{
436    process_needs_restart = 0;
437    service_for_each_flags(SVC_RESTARTING,
438                           restart_service_if_needed);
439}
440
441static void msg_start(const char *name)
442{
443    struct service *svc;
444    char *tmp = NULL;
445    char *args = NULL;
446
447    if (!strchr(name, ':'))
448        svc = service_find_by_name(name);
449    else {
450        tmp = strdup(name);
451        args = strchr(tmp, ':');
452        *args = '\0';
453        args++;
454
455        svc = service_find_by_name(tmp);
456    }
457
458    if (svc) {
459        service_start(svc, args);
460    } else {
461        ERROR("no such service '%s'\n", name);
462    }
463    if (tmp)
464        free(tmp);
465}
466
467static void msg_stop(const char *name)
468{
469    struct service *svc = service_find_by_name(name);
470
471    if (svc) {
472        service_stop(svc);
473    } else {
474        ERROR("no such service '%s'\n", name);
475    }
476}
477
478void handle_control_message(const char *msg, const char *arg)
479{
480    if (!strcmp(msg,"start")) {
481        msg_start(arg);
482    } else if (!strcmp(msg,"stop")) {
483        msg_stop(arg);
484    } else if (!strcmp(msg,"restart")) {
485        msg_stop(arg);
486        msg_start(arg);
487    } else {
488        ERROR("unknown control msg '%s'\n", msg);
489    }
490}
491
492static struct command *get_first_command(struct action *act)
493{
494    struct listnode *node;
495    node = list_head(&act->commands);
496    if (!node || list_empty(&act->commands))
497        return NULL;
498
499    return node_to_item(node, struct command, clist);
500}
501
502static struct command *get_next_command(struct action *act, struct command *cmd)
503{
504    struct listnode *node;
505    node = cmd->clist.next;
506    if (!node)
507        return NULL;
508    if (node == &act->commands)
509        return NULL;
510
511    return node_to_item(node, struct command, clist);
512}
513
514static int is_last_command(struct action *act, struct command *cmd)
515{
516    return (list_tail(&act->commands) == &cmd->clist);
517}
518
519void execute_one_command(void)
520{
521    int ret;
522
523    if (!cur_action || !cur_command || is_last_command(cur_action, cur_command)) {
524        cur_action = action_remove_queue_head();
525        cur_command = NULL;
526        if (!cur_action)
527            return;
528        INFO("processing action %p (%s)\n", cur_action, cur_action->name);
529        cur_command = get_first_command(cur_action);
530    } else {
531        cur_command = get_next_command(cur_action, cur_command);
532    }
533
534    if (!cur_command)
535        return;
536
537    ret = cur_command->func(cur_command->nargs, cur_command->args);
538    INFO("command '%s' r=%d\n", cur_command->args[0], ret);
539}
540
541static int wait_for_coldboot_done_action(int nargs, char **args)
542{
543    int ret;
544    INFO("wait for %s\n", coldboot_done);
545    ret = wait_for_file(coldboot_done, COMMAND_RETRY_TIMEOUT);
546    if (ret)
547        ERROR("Timed out waiting for %s\n", coldboot_done);
548    return ret;
549}
550
551static int keychord_init_action(int nargs, char **args)
552{
553    keychord_init();
554    return 0;
555}
556
557static int console_init_action(int nargs, char **args)
558{
559    int fd;
560    char tmp[PROP_VALUE_MAX];
561
562    if (console[0]) {
563        snprintf(tmp, sizeof(tmp), "/dev/%s", console);
564        console_name = strdup(tmp);
565    }
566
567    fd = open(console_name, O_RDWR);
568    if (fd >= 0)
569        have_console = 1;
570    close(fd);
571
572    if( load_565rle_image(INIT_IMAGE_FILE) ) {
573        fd = open("/dev/tty0", O_WRONLY);
574        if (fd >= 0) {
575            const char *msg;
576                msg = "\n"
577            "\n"
578            "\n"
579            "\n"
580            "\n"
581            "\n"
582            "\n"  // console is 40 cols x 30 lines
583            "\n"
584            "\n"
585            "\n"
586            "\n"
587            "\n"
588            "\n"
589            "\n"
590            "             A N D R O I D ";
591            write(fd, msg, strlen(msg));
592            close(fd);
593        }
594    }
595    return 0;
596}
597
598static void import_kernel_nv(char *name, int for_emulator)
599{
600    char *value = strchr(name, '=');
601    int name_len = strlen(name);
602
603    if (value == 0) return;
604    *value++ = 0;
605    if (name_len == 0) return;
606
607#ifdef HAVE_SELINUX
608    if (!strcmp(name,"enforcing")) {
609        selinux_enforcing = atoi(value);
610    } else if (!strcmp(name,"selinux")) {
611        selinux_enabled = atoi(value);
612    }
613#endif
614
615    if (for_emulator) {
616        /* in the emulator, export any kernel option with the
617         * ro.kernel. prefix */
618        char buff[PROP_NAME_MAX];
619        int len = snprintf( buff, sizeof(buff), "ro.kernel.%s", name );
620
621        if (len < (int)sizeof(buff))
622            property_set( buff, value );
623        return;
624    }
625
626    if (!strcmp(name,"qemu")) {
627        strlcpy(qemu, value, sizeof(qemu));
628    } else if (!strncmp(name, "androidboot.", 12) && name_len > 12) {
629        const char *boot_prop_name = name + 12;
630        char prop[PROP_NAME_MAX];
631        int cnt;
632
633        cnt = snprintf(prop, sizeof(prop), "ro.boot.%s", boot_prop_name);
634        if (cnt < PROP_NAME_MAX)
635            property_set(prop, value);
636    }
637}
638
639static void export_kernel_boot_props(void)
640{
641    char tmp[PROP_VALUE_MAX];
642    const char *pval;
643    unsigned i;
644    struct {
645        const char *src_prop;
646        const char *dest_prop;
647        const char *def_val;
648    } prop_map[] = {
649        { "ro.boot.serialno", "ro.serialno", "", },
650        { "ro.boot.mode", "ro.bootmode", "unknown", },
651        { "ro.boot.baseband", "ro.baseband", "unknown", },
652        { "ro.boot.bootloader", "ro.bootloader", "unknown", },
653    };
654
655    for (i = 0; i < ARRAY_SIZE(prop_map); i++) {
656        pval = property_get(prop_map[i].src_prop);
657        property_set(prop_map[i].dest_prop, pval ?: prop_map[i].def_val);
658    }
659
660    pval = property_get("ro.boot.console");
661    if (pval)
662        strlcpy(console, pval, sizeof(console));
663
664    /* save a copy for init's usage during boot */
665    strlcpy(bootmode, property_get("ro.bootmode"), sizeof(bootmode));
666
667    /* if this was given on kernel command line, override what we read
668     * before (e.g. from /proc/cpuinfo), if anything */
669    pval = property_get("ro.boot.hardware");
670    if (pval)
671        strlcpy(hardware, pval, sizeof(hardware));
672    property_set("ro.hardware", hardware);
673
674    snprintf(tmp, PROP_VALUE_MAX, "%d", revision);
675    property_set("ro.revision", tmp);
676
677    /* TODO: these are obsolete. We should delete them */
678    if (!strcmp(bootmode,"factory"))
679        property_set("ro.factorytest", "1");
680    else if (!strcmp(bootmode,"factory2"))
681        property_set("ro.factorytest", "2");
682    else
683        property_set("ro.factorytest", "0");
684}
685
686static void process_kernel_cmdline(void)
687{
688    /* don't expose the raw commandline to nonpriv processes */
689    chmod("/proc/cmdline", 0440);
690
691    /* first pass does the common stuff, and finds if we are in qemu.
692     * second pass is only necessary for qemu to export all kernel params
693     * as props.
694     */
695    import_kernel_cmdline(0, import_kernel_nv);
696    if (qemu[0])
697        import_kernel_cmdline(1, import_kernel_nv);
698
699    /* now propogate the info given on command line to internal variables
700     * used by init as well as the current required properties
701     */
702    export_kernel_boot_props();
703}
704
705static int property_service_init_action(int nargs, char **args)
706{
707    /* read any property files on system or data and
708     * fire up the property service.  This must happen
709     * after the ro.foo properties are set above so
710     * that /data/local.prop cannot interfere with them.
711     */
712    start_property_service();
713    return 0;
714}
715
716static int signal_init_action(int nargs, char **args)
717{
718    signal_init();
719    return 0;
720}
721
722static int check_startup_action(int nargs, char **args)
723{
724    /* make sure we actually have all the pieces we need */
725    if ((get_property_set_fd() < 0) ||
726        (get_signal_fd() < 0)) {
727        ERROR("init startup failure\n");
728        exit(1);
729    }
730
731        /* signal that we hit this point */
732    unlink("/dev/.booting");
733
734    return 0;
735}
736
737static int queue_property_triggers_action(int nargs, char **args)
738{
739    queue_all_property_triggers();
740    /* enable property triggers */
741    property_triggers_enabled = 1;
742    return 0;
743}
744
745#if BOOTCHART
746static int bootchart_init_action(int nargs, char **args)
747{
748    bootchart_count = bootchart_init();
749    if (bootchart_count < 0) {
750        ERROR("bootcharting init failure\n");
751    } else if (bootchart_count > 0) {
752        NOTICE("bootcharting started (period=%d ms)\n", bootchart_count*BOOTCHART_POLLING_MS);
753    } else {
754        NOTICE("bootcharting ignored\n");
755    }
756
757    return 0;
758}
759#endif
760
761#ifdef HAVE_SELINUX
762void selinux_load_policy(void)
763{
764    const char path_prefix[] = "/sepolicy";
765    struct selinux_opt seopts[] = {
766        { SELABEL_OPT_PATH, "/file_contexts" }
767    };
768    char path[PATH_MAX];
769    int fd, rc, vers;
770    struct stat sb;
771    void *map;
772
773    sehandle = NULL;
774    if (!selinux_enabled) {
775        INFO("SELinux:  Disabled by command line option\n");
776        return;
777    }
778
779    mkdir(SELINUXMNT, 0755);
780    if (mount("selinuxfs", SELINUXMNT, "selinuxfs", 0, NULL)) {
781        if (errno == ENODEV) {
782            /* SELinux not enabled in kernel */
783            return;
784        }
785        ERROR("SELinux:  Could not mount selinuxfs:  %s\n",
786              strerror(errno));
787        return;
788    }
789    set_selinuxmnt(SELINUXMNT);
790
791    vers = security_policyvers();
792    if (vers <= 0) {
793        ERROR("SELinux:  Unable to read policy version\n");
794        return;
795    }
796    INFO("SELinux:  Maximum supported policy version:  %d\n", vers);
797
798    snprintf(path, sizeof(path), "%s.%d",
799             path_prefix, vers);
800    fd = open(path, O_RDONLY);
801    while (fd < 0 && errno == ENOENT && --vers) {
802        snprintf(path, sizeof(path), "%s.%d",
803                 path_prefix, vers);
804        fd = open(path, O_RDONLY);
805    }
806    if (fd < 0) {
807        ERROR("SELinux:  Could not open %s:  %s\n",
808              path, strerror(errno));
809        return;
810    }
811    if (fstat(fd, &sb) < 0) {
812        ERROR("SELinux:  Could not stat %s:  %s\n",
813              path, strerror(errno));
814        return;
815    }
816    map = mmap(NULL, sb.st_size, PROT_READ, MAP_PRIVATE, fd, 0);
817    if (map == MAP_FAILED) {
818        ERROR("SELinux:  Could not map %s:  %s\n",
819              path, strerror(errno));
820        return;
821    }
822
823    rc = security_load_policy(map, sb.st_size);
824    if (rc < 0) {
825        ERROR("SELinux:  Could not load policy:  %s\n",
826              strerror(errno));
827        return;
828    }
829
830    rc = security_setenforce(selinux_enforcing);
831    if (rc < 0) {
832        ERROR("SELinux:  Could not set enforcing mode to %s:  %s\n",
833              selinux_enforcing ? "enforcing" : "permissive", strerror(errno));
834        return;
835    }
836
837    munmap(map, sb.st_size);
838    close(fd);
839    INFO("SELinux: Loaded policy from %s\n", path);
840
841    sehandle = selabel_open(SELABEL_CTX_FILE, seopts, 1);
842    if (!sehandle) {
843        ERROR("SELinux:  Could not load file_contexts:  %s\n",
844              strerror(errno));
845        return;
846    }
847    INFO("SELinux: Loaded file contexts from %s\n", seopts[0].value);
848    return;
849}
850#endif
851
852int main(int argc, char **argv)
853{
854    int fd_count = 0;
855    struct pollfd ufds[4];
856    char *tmpdev;
857    char* debuggable;
858    char tmp[32];
859    int property_set_fd_init = 0;
860    int signal_fd_init = 0;
861    int keychord_fd_init = 0;
862    bool is_charger = false;
863
864    if (!strcmp(basename(argv[0]), "ueventd"))
865        return ueventd_main(argc, argv);
866
867    if (!strcmp(basename(argv[0]), "watchdogd"))
868        return watchdogd_main(argc, argv);
869
870    /* clear the umask */
871    umask(0);
872
873        /* Get the basic filesystem setup we need put
874         * together in the initramdisk on / and then we'll
875         * let the rc file figure out the rest.
876         */
877    mkdir("/dev", 0755);
878    mkdir("/proc", 0755);
879    mkdir("/sys", 0755);
880
881    mount("tmpfs", "/dev", "tmpfs", MS_NOSUID, "mode=0755");
882    mkdir("/dev/pts", 0755);
883    mkdir("/dev/socket", 0755);
884    mount("devpts", "/dev/pts", "devpts", 0, NULL);
885    mount("proc", "/proc", "proc", 0, NULL);
886    mount("sysfs", "/sys", "sysfs", 0, NULL);
887
888        /* indicate that booting is in progress to background fw loaders, etc */
889    close(open("/dev/.booting", O_WRONLY | O_CREAT, 0000));
890
891        /* We must have some place other than / to create the
892         * device nodes for kmsg and null, otherwise we won't
893         * be able to remount / read-only later on.
894         * Now that tmpfs is mounted on /dev, we can actually
895         * talk to the outside world.
896         */
897    open_devnull_stdio();
898    klog_init();
899    property_init();
900
901    get_hardware_name(hardware, &revision);
902
903    process_kernel_cmdline();
904
905#ifdef HAVE_SELINUX
906    INFO("loading selinux policy\n");
907    selinux_load_policy();
908#endif
909
910    is_charger = !strcmp(bootmode, "charger");
911
912    INFO("property init\n");
913    if (!is_charger)
914        property_load_boot_defaults();
915
916    INFO("reading config file\n");
917    init_parse_config_file("/init.rc");
918
919    action_for_each_trigger("early-init", action_add_queue_tail);
920
921    queue_builtin_action(wait_for_coldboot_done_action, "wait_for_coldboot_done");
922    queue_builtin_action(keychord_init_action, "keychord_init");
923    queue_builtin_action(console_init_action, "console_init");
924
925    /* execute all the boot actions to get us started */
926    action_for_each_trigger("init", action_add_queue_tail);
927
928    /* skip mounting filesystems in charger mode */
929    if (!is_charger) {
930        action_for_each_trigger("early-fs", action_add_queue_tail);
931        action_for_each_trigger("fs", action_add_queue_tail);
932        action_for_each_trigger("post-fs", action_add_queue_tail);
933        action_for_each_trigger("post-fs-data", action_add_queue_tail);
934    }
935
936    queue_builtin_action(property_service_init_action, "property_service_init");
937    queue_builtin_action(signal_init_action, "signal_init");
938    queue_builtin_action(check_startup_action, "check_startup");
939
940    if (is_charger) {
941        action_for_each_trigger("charger", action_add_queue_tail);
942    } else {
943        action_for_each_trigger("early-boot", action_add_queue_tail);
944        action_for_each_trigger("boot", action_add_queue_tail);
945    }
946
947        /* run all property triggers based on current state of the properties */
948    queue_builtin_action(queue_property_triggers_action, "queue_property_triggers");
949
950
951#if BOOTCHART
952    queue_builtin_action(bootchart_init_action, "bootchart_init");
953#endif
954
955    for(;;) {
956        int nr, i, timeout = -1;
957
958        execute_one_command();
959        restart_processes();
960
961        if (!property_set_fd_init && get_property_set_fd() > 0) {
962            ufds[fd_count].fd = get_property_set_fd();
963            ufds[fd_count].events = POLLIN;
964            ufds[fd_count].revents = 0;
965            fd_count++;
966            property_set_fd_init = 1;
967        }
968        if (!signal_fd_init && get_signal_fd() > 0) {
969            ufds[fd_count].fd = get_signal_fd();
970            ufds[fd_count].events = POLLIN;
971            ufds[fd_count].revents = 0;
972            fd_count++;
973            signal_fd_init = 1;
974        }
975        if (!keychord_fd_init && get_keychord_fd() > 0) {
976            ufds[fd_count].fd = get_keychord_fd();
977            ufds[fd_count].events = POLLIN;
978            ufds[fd_count].revents = 0;
979            fd_count++;
980            keychord_fd_init = 1;
981        }
982
983        if (process_needs_restart) {
984            timeout = (process_needs_restart - gettime()) * 1000;
985            if (timeout < 0)
986                timeout = 0;
987        }
988
989        if (!action_queue_empty() || cur_action)
990            timeout = 0;
991
992#if BOOTCHART
993        if (bootchart_count > 0) {
994            if (timeout < 0 || timeout > BOOTCHART_POLLING_MS)
995                timeout = BOOTCHART_POLLING_MS;
996            if (bootchart_step() < 0 || --bootchart_count == 0) {
997                bootchart_finish();
998                bootchart_count = 0;
999            }
1000        }
1001#endif
1002
1003        nr = poll(ufds, fd_count, timeout);
1004        if (nr <= 0)
1005            continue;
1006
1007        for (i = 0; i < fd_count; i++) {
1008            if (ufds[i].revents == POLLIN) {
1009                if (ufds[i].fd == get_property_set_fd())
1010                    handle_property_set_fd();
1011                else if (ufds[i].fd == get_keychord_fd())
1012                    handle_keychord();
1013                else if (ufds[i].fd == get_signal_fd())
1014                    handle_signal();
1015            }
1016        }
1017    }
1018
1019    return 0;
1020}
1021