installd.cpp revision d089ca1703769854356a263ca640d3e07ab8548d 
1/*
2** Copyright 2008, The Android Open Source Project
3**
4** Licensed under the Apache License, Version 2.0 (the "License");
5** you may not use this file except in compliance with the License.
6** You may obtain a copy of the License at
7**
8**     http://www.apache.org/licenses/LICENSE-2.0
9**
10** Unless required by applicable law or agreed to in writing, software
11** distributed under the License is distributed on an "AS IS" BASIS,
12** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13** See the License for the specific language governing permissions and
14** limitations under the License.
15*/
16
17#include <fcntl.h>
18#include <selinux/android.h>
19#include <selinux/avc.h>
20#include <sys/capability.h>
21#include <sys/fsuid.h>
22#include <sys/prctl.h>
23#include <sys/socket.h>
24#include <sys/stat.h>
25
26#include <android-base/logging.h>
27#include <cutils/fs.h>
28#include <cutils/log.h>               // TODO: Move everything to base::logging.
29#include <cutils/properties.h>
30#include <cutils/sockets.h>
31#include <private/android_filesystem_config.h>
32
33#include <commands.h>
34#include <globals.h>
35#include <installd_constants.h>
36#include <installd_deps.h>  // Need to fill in requirements of commands.
37#include <utils.h>
38
39#ifndef LOG_TAG
40#define LOG_TAG "installd"
41#endif
42#define SOCKET_PATH "installd"
43
44#define BUFFER_MAX    1024  /* input buffer for commands */
45#define TOKEN_MAX     16    /* max number of arguments in buffer */
46#define REPLY_MAX     256   /* largest reply allowed */
47
48namespace android {
49namespace installd {
50
51// Check that installd-deps sizes match cutils sizes.
52static_assert(kPropertyKeyMax == PROPERTY_KEY_MAX, "Size mismatch.");
53static_assert(kPropertyValueMax == PROPERTY_VALUE_MAX, "Size mismatch.");
54
55////////////////////////
56// Plug-in functions. //
57////////////////////////
58
59int get_property(const char *key, char *value, const char *default_value) {
60    return property_get(key, value, default_value);
61}
62
63// Compute the output path of
64bool calculate_oat_file_path(char path[PKG_PATH_MAX],
65                             const char *oat_dir,
66                             const char *apk_path,
67                             const char *instruction_set) {
68    const char *file_name_start;
69    const char *file_name_end;
70
71    file_name_start = strrchr(apk_path, '/');
72    if (file_name_start == NULL) {
73        ALOGE("apk_path '%s' has no '/'s in it\n", apk_path);
74        return false;
75    }
76    file_name_end = strrchr(apk_path, '.');
77    if (file_name_end < file_name_start) {
78        ALOGE("apk_path '%s' has no extension\n", apk_path);
79        return false;
80    }
81
82    // Calculate file_name
83    int file_name_len = file_name_end - file_name_start - 1;
84    char file_name[file_name_len + 1];
85    memcpy(file_name, file_name_start + 1, file_name_len);
86    file_name[file_name_len] = '\0';
87
88    // <apk_parent_dir>/oat/<isa>/<file_name>.odex
89    snprintf(path, PKG_PATH_MAX, "%s/%s/%s.odex", oat_dir, instruction_set, file_name);
90    return true;
91}
92
93/*
94 * Computes the odex file for the given apk_path and instruction_set.
95 * /system/framework/whatever.jar -> /system/framework/oat/<isa>/whatever.odex
96 *
97 * Returns false if it failed to determine the odex file path.
98 */
99bool calculate_odex_file_path(char path[PKG_PATH_MAX],
100                              const char *apk_path,
101                              const char *instruction_set) {
102    if (strlen(apk_path) + strlen("oat/") + strlen(instruction_set)
103            + strlen("/") + strlen("odex") + 1 > PKG_PATH_MAX) {
104        ALOGE("apk_path '%s' may be too long to form odex file path.\n", apk_path);
105        return false;
106    }
107
108    strcpy(path, apk_path);
109    char *end = strrchr(path, '/');
110    if (end == NULL) {
111        ALOGE("apk_path '%s' has no '/'s in it?!\n", apk_path);
112        return false;
113    }
114    const char *apk_end = apk_path + (end - path); // strrchr(apk_path, '/');
115
116    strcpy(end + 1, "oat/");       // path = /system/framework/oat/\0
117    strcat(path, instruction_set); // path = /system/framework/oat/<isa>\0
118    strcat(path, apk_end);         // path = /system/framework/oat/<isa>/whatever.jar\0
119    end = strrchr(path, '.');
120    if (end == NULL) {
121        ALOGE("apk_path '%s' has no extension.\n", apk_path);
122        return false;
123    }
124    strcpy(end + 1, "odex");
125    return true;
126}
127
128bool create_cache_path(char path[PKG_PATH_MAX],
129                       const char *src,
130                       const char *instruction_set) {
131    /* demand that we are an absolute path */
132    if ((src == nullptr) || (src[0] != '/') || strstr(src,"..")) {
133        return false;
134    }
135
136    size_t srclen = strlen(src);
137
138    if (srclen > PKG_PATH_MAX) {        // XXX: PKG_NAME_MAX?
139        return false;
140    }
141
142    size_t dstlen =
143        android_data_dir.len +
144        strlen(DALVIK_CACHE) +
145        1 +
146        strlen(instruction_set) +
147        srclen +
148        strlen(DALVIK_CACHE_POSTFIX) + 2;
149
150    if (dstlen > PKG_PATH_MAX) {
151        return false;
152    }
153
154    sprintf(path,"%s%s/%s/%s%s",
155            android_data_dir.path,
156            DALVIK_CACHE,
157            instruction_set,
158            src + 1, /* skip the leading / */
159            DALVIK_CACHE_POSTFIX);
160
161    char* tmp =
162            path +
163            android_data_dir.len +
164            strlen(DALVIK_CACHE) +
165            1 +
166            strlen(instruction_set) + 1;
167
168    for(; *tmp; tmp++) {
169        if (*tmp == '/') {
170            *tmp = '@';
171        }
172    }
173
174    return true;
175}
176
177
178static char* parse_null(char* arg) {
179    if (strcmp(arg, "!") == 0) {
180        return nullptr;
181    } else {
182        return arg;
183    }
184}
185
186static int do_ping(char **arg ATTRIBUTE_UNUSED, char reply[REPLY_MAX] ATTRIBUTE_UNUSED)
187{
188    return 0;
189}
190
191static int do_create_app_data(char **arg, char reply[REPLY_MAX] ATTRIBUTE_UNUSED) {
192    /* const char *uuid, const char *pkgname, userid_t userid, int flags,
193            appid_t appid, const char* seinfo, int target_sdk_version */
194    return create_app_data(parse_null(arg[0]), arg[1], atoi(arg[2]), atoi(arg[3]),
195                           atoi(arg[4]), arg[5], atoi(arg[6]));
196}
197
198static int do_restorecon_app_data(char **arg, char reply[REPLY_MAX] ATTRIBUTE_UNUSED) {
199    /* const char* uuid, const char* pkgName, userid_t userid, int flags,
200            appid_t appid, const char* seinfo */
201    return restorecon_app_data(parse_null(arg[0]), arg[1], atoi(arg[2]), atoi(arg[3]), atoi(arg[4]), arg[5]);
202}
203
204static int do_migrate_app_data(char **arg, char reply[REPLY_MAX] ATTRIBUTE_UNUSED) {
205    /* const char *uuid, const char *pkgname, userid_t userid, int flags */
206    return migrate_app_data(parse_null(arg[0]), arg[1], atoi(arg[2]), atoi(arg[3]));
207}
208
209static int do_clear_app_data(char **arg, char reply[REPLY_MAX] ATTRIBUTE_UNUSED) {
210    /* const char *uuid, const char *pkgname, userid_t userid, int flags, ino_t ce_data_inode */
211    return clear_app_data(parse_null(arg[0]), arg[1], atoi(arg[2]), atoi(arg[3]), atol(arg[4]));
212}
213
214static int do_destroy_app_data(char **arg, char reply[REPLY_MAX] ATTRIBUTE_UNUSED) {
215    /* const char *uuid, const char *pkgname, userid_t userid, int flags, ino_t ce_data_inode */
216    return destroy_app_data(parse_null(arg[0]), arg[1], atoi(arg[2]), atoi(arg[3]), atol(arg[4]));
217}
218
219// We use otapreopt_chroot to get into the chroot.
220static constexpr const char* kOtaPreopt = "/system/bin/otapreopt_chroot";
221
222static int do_ota_dexopt(const char* args[DEXOPT_PARAM_COUNT],
223                         char reply[REPLY_MAX] ATTRIBUTE_UNUSED) {
224    // Time to fork and run otapreopt.
225
226    // Check that the tool exists.
227    struct stat s;
228    if (stat(kOtaPreopt, &s) != 0) {
229        LOG(ERROR) << "Otapreopt chroot tool not found.";
230        return -1;
231    }
232
233    pid_t pid = fork();
234    if (pid == 0) {
235        const char* argv[1 + DEXOPT_PARAM_COUNT + 1];
236        argv[0] = kOtaPreopt;
237
238        for (size_t i = 0; i < DEXOPT_PARAM_COUNT; ++i) {
239            argv[i + 1] = args[i];
240        }
241
242        argv[DEXOPT_PARAM_COUNT + 1] = nullptr;
243
244        execv(argv[0], (char * const *)argv);
245        PLOG(ERROR) << "execv(OTAPREOPT_CHROOT) failed";
246        exit(99);
247    } else {
248        int res = wait_child(pid);
249        if (res == 0) {
250            ALOGV("DexInv: --- END OTAPREOPT (success) ---\n");
251        } else {
252            ALOGE("DexInv: --- END OTAPREOPT --- status=0x%04x, process failed\n", res);
253        }
254        return res;
255    }
256}
257
258static int do_regular_dexopt(const char* args[DEXOPT_PARAM_COUNT],
259                             char reply[REPLY_MAX] ATTRIBUTE_UNUSED) {
260    return dexopt(args);
261}
262
263using DexoptFn = int (*)(const char* args[DEXOPT_PARAM_COUNT],
264                         char reply[REPLY_MAX]);
265
266static int do_dexopt(char **arg, char reply[REPLY_MAX])
267{
268    const char* args[DEXOPT_PARAM_COUNT];
269    for (size_t i = 0; i < DEXOPT_PARAM_COUNT; ++i) {
270        CHECK(arg[i] != nullptr);
271        args[i] = arg[i];
272    }
273
274    int dexopt_flags = atoi(arg[6]);
275    DexoptFn dexopt_fn;
276    if ((dexopt_flags & DEXOPT_OTA) != 0) {
277        dexopt_fn = do_ota_dexopt;
278    } else {
279        dexopt_fn = do_regular_dexopt;
280    }
281    return dexopt_fn(args, reply);
282}
283
284static int do_merge_profiles(char **arg, char reply[REPLY_MAX])
285{
286    uid_t uid = static_cast<uid_t>(atoi(arg[0]));
287    const char* pkgname = arg[1];
288    if (merge_profiles(uid, pkgname)) {
289        strncpy(reply, "true", REPLY_MAX);
290    } else {
291        strncpy(reply, "false", REPLY_MAX);
292    }
293    return 0;
294}
295
296static int do_dump_profiles(char **arg, char reply[REPLY_MAX])
297{
298    uid_t uid = static_cast<uid_t>(atoi(arg[0]));
299    const char* pkgname = arg[1];
300    const char* dex_files = arg[2];
301    if (dump_profile(uid, pkgname, dex_files)) {
302        strncpy(reply, "true", REPLY_MAX);
303    } else {
304        strncpy(reply, "false", REPLY_MAX);
305    }
306    return 0;
307}
308
309static int do_mark_boot_complete(char **arg, char reply[REPLY_MAX] ATTRIBUTE_UNUSED)
310{
311    return mark_boot_complete(arg[0] /* instruction set */);
312}
313
314static int do_rm_dex(char **arg, char reply[REPLY_MAX] ATTRIBUTE_UNUSED)
315{
316    return rm_dex(arg[0], arg[1]); /* pkgname, instruction_set */
317}
318
319static int do_free_cache(char **arg, char reply[REPLY_MAX] ATTRIBUTE_UNUSED) /* TODO int:free_size */
320{
321    return free_cache(parse_null(arg[0]), (int64_t)atoll(arg[1])); /* uuid, free_size */
322}
323
324static int do_get_app_size(char **arg, char reply[REPLY_MAX]) {
325    int64_t codesize = 0;
326    int64_t datasize = 0;
327    int64_t cachesize = 0;
328    int64_t asecsize = 0;
329    int res = 0;
330
331    /* const char *uuid, const char *pkgname, int userid, int flags, ino_t ce_data_inode,
332            const char* code_path */
333    res = get_app_size(parse_null(arg[0]), arg[1], atoi(arg[2]), atoi(arg[3]), atol(arg[4]),
334            arg[5], &codesize, &datasize, &cachesize, &asecsize);
335
336    /*
337     * Each int64_t can take up 22 characters printed out. Make sure it
338     * doesn't go over REPLY_MAX in the future.
339     */
340    snprintf(reply, REPLY_MAX, "%" PRId64 " %" PRId64 " %" PRId64 " %" PRId64,
341            codesize, datasize, cachesize, asecsize);
342    return res;
343}
344
345static int do_get_app_data_inode(char **arg, char reply[REPLY_MAX]) {
346    ino_t inode = 0;
347    int res = 0;
348
349    /* const char *uuid, const char *pkgname, int userid, int flags */
350    res = get_app_data_inode(parse_null(arg[0]), arg[1], atoi(arg[2]), atoi(arg[3]), &inode);
351
352    snprintf(reply, REPLY_MAX, "%" PRId64, (int64_t) inode);
353    return res;
354}
355
356static int do_move_complete_app(char **arg, char reply[REPLY_MAX] ATTRIBUTE_UNUSED) {
357    /* const char* from_uuid, const char *to_uuid, const char *package_name,
358            const char *data_app_name, appid_t appid, const char* seinfo,
359            int target_sdk_version */
360    return move_complete_app(parse_null(arg[0]), parse_null(arg[1]), arg[2], arg[3],
361                             atoi(arg[4]), arg[5], atoi(arg[6]));
362}
363
364static int do_create_user_data(char **arg, char reply[REPLY_MAX] ATTRIBUTE_UNUSED)
365{
366    /* const char *uuid, userid_t userid, int user_serial, int flags */
367    return create_user_data(parse_null(arg[0]), atoi(arg[1]), atoi(arg[2]), atoi(arg[3]));
368}
369
370static int do_destroy_user_data(char **arg, char reply[REPLY_MAX] ATTRIBUTE_UNUSED)
371{
372    /* const char *uuid, userid_t userid, int flags */
373    return destroy_user_data(parse_null(arg[0]), atoi(arg[1]), atoi(arg[2]));
374}
375
376static int do_linklib(char **arg, char reply[REPLY_MAX] ATTRIBUTE_UNUSED)
377{
378    return linklib(parse_null(arg[0]), arg[1], arg[2], atoi(arg[3]));
379}
380
381static int do_idmap(char **arg, char reply[REPLY_MAX] ATTRIBUTE_UNUSED)
382{
383    return idmap(arg[0], arg[1], atoi(arg[2]));
384}
385
386static int do_create_oat_dir(char **arg, char reply[REPLY_MAX] ATTRIBUTE_UNUSED)
387{
388    /* oat_dir, instruction_set */
389    return create_oat_dir(arg[0], arg[1]);
390}
391
392static int do_rm_package_dir(char **arg, char reply[REPLY_MAX] ATTRIBUTE_UNUSED)
393{
394    /* oat_dir */
395    return rm_package_dir(arg[0]);
396}
397
398static int do_clear_app_profiles(char **arg, char reply[REPLY_MAX] ATTRIBUTE_UNUSED)
399{
400    /* package_name */
401    return clear_app_profiles(arg[0]);
402}
403
404static int do_destroy_app_profiles(char **arg, char reply[REPLY_MAX] ATTRIBUTE_UNUSED)
405{
406    /* package_name */
407    return destroy_app_profiles(arg[0]);
408}
409
410static int do_link_file(char **arg, char reply[REPLY_MAX] ATTRIBUTE_UNUSED)
411{
412    /* relative_path, from_base, to_base */
413    return link_file(arg[0], arg[1], arg[2]);
414}
415
416static int do_move_ab(char **arg, char reply[REPLY_MAX] ATTRIBUTE_UNUSED) {
417    // apk_path, instruction_set, oat_dir
418    return move_ab(arg[0], arg[1], arg[2]);
419}
420
421struct cmdinfo {
422    const char *name;
423    unsigned numargs;
424    int (*func)(char **arg, char reply[REPLY_MAX]);
425};
426
427struct cmdinfo cmds[] = {
428    { "ping",                 0, do_ping },
429
430    { "create_app_data",      7, do_create_app_data },
431    { "restorecon_app_data",  6, do_restorecon_app_data },
432    { "migrate_app_data",     4, do_migrate_app_data },
433    { "clear_app_data",       5, do_clear_app_data },
434    { "destroy_app_data",     5, do_destroy_app_data },
435    { "move_complete_app",    7, do_move_complete_app },
436    { "get_app_size",         6, do_get_app_size },
437    { "get_app_data_inode",   4, do_get_app_data_inode },
438
439    { "create_user_data",     4, do_create_user_data },
440    { "destroy_user_data",    3, do_destroy_user_data },
441
442    { "dexopt",              10, do_dexopt },
443    { "markbootcomplete",     1, do_mark_boot_complete },
444    { "rmdex",                2, do_rm_dex },
445    { "freecache",            2, do_free_cache },
446    { "linklib",              4, do_linklib },
447    { "idmap",                3, do_idmap },
448    { "createoatdir",         2, do_create_oat_dir },
449    { "rmpackagedir",         1, do_rm_package_dir },
450    { "clear_app_profiles",   1, do_clear_app_profiles },
451    { "destroy_app_profiles", 1, do_destroy_app_profiles },
452    { "linkfile",             3, do_link_file },
453    { "move_ab",              3, do_move_ab },
454    { "merge_profiles",       2, do_merge_profiles },
455    { "dump_profiles",        3, do_dump_profiles },
456};
457
458static int readx(int s, void *_buf, int count)
459{
460    char *buf = (char *) _buf;
461    int n = 0, r;
462    if (count < 0) return -1;
463    while (n < count) {
464        r = read(s, buf + n, count - n);
465        if (r < 0) {
466            if (errno == EINTR) continue;
467            ALOGE("read error: %s\n", strerror(errno));
468            return -1;
469        }
470        if (r == 0) {
471            ALOGE("eof\n");
472            return -1; /* EOF */
473        }
474        n += r;
475    }
476    return 0;
477}
478
479static int writex(int s, const void *_buf, int count)
480{
481    const char *buf = (const char *) _buf;
482    int n = 0, r;
483    if (count < 0) return -1;
484    while (n < count) {
485        r = write(s, buf + n, count - n);
486        if (r < 0) {
487            if (errno == EINTR) continue;
488            ALOGE("write error: %s\n", strerror(errno));
489            return -1;
490        }
491        n += r;
492    }
493    return 0;
494}
495
496
497/* Tokenize the command buffer, locate a matching command,
498 * ensure that the required number of arguments are provided,
499 * call the function(), return the result.
500 */
501static int execute(int s, char cmd[BUFFER_MAX])
502{
503    char reply[REPLY_MAX];
504    char *arg[TOKEN_MAX+1];
505    unsigned i;
506    unsigned n = 0;
507    unsigned short count;
508    int ret = -1;
509
510    // ALOGI("execute('%s')\n", cmd);
511
512        /* default reply is "" */
513    reply[0] = 0;
514
515        /* n is number of args (not counting arg[0]) */
516    arg[0] = cmd;
517    while (*cmd) {
518        if (isspace(*cmd)) {
519            *cmd++ = 0;
520            n++;
521            arg[n] = cmd;
522            if (n == TOKEN_MAX) {
523                ALOGE("too many arguments\n");
524                goto done;
525            }
526        }
527        if (*cmd) {
528          cmd++;
529        }
530    }
531
532    for (i = 0; i < sizeof(cmds) / sizeof(cmds[0]); i++) {
533        if (!strcmp(cmds[i].name,arg[0])) {
534            if (n != cmds[i].numargs) {
535                ALOGE("%s requires %d arguments (%d given)\n",
536                     cmds[i].name, cmds[i].numargs, n);
537            } else {
538                ret = cmds[i].func(arg + 1, reply);
539            }
540            goto done;
541        }
542    }
543    ALOGE("unsupported command '%s'\n", arg[0]);
544
545done:
546    if (reply[0]) {
547        n = snprintf(cmd, BUFFER_MAX, "%d %s", ret, reply);
548    } else {
549        n = snprintf(cmd, BUFFER_MAX, "%d", ret);
550    }
551    if (n > BUFFER_MAX) n = BUFFER_MAX;
552    count = n;
553
554    // ALOGI("reply: '%s'\n", cmd);
555    if (writex(s, &count, sizeof(count))) return -1;
556    if (writex(s, cmd, count)) return -1;
557    return 0;
558}
559
560static bool initialize_globals() {
561    const char* data_path = getenv("ANDROID_DATA");
562    if (data_path == nullptr) {
563        ALOGE("Could not find ANDROID_DATA");
564        return false;
565    }
566    const char* root_path = getenv("ANDROID_ROOT");
567    if (root_path == nullptr) {
568        ALOGE("Could not find ANDROID_ROOT");
569        return false;
570    }
571
572    return init_globals_from_data_and_root(data_path, root_path);
573}
574
575static int initialize_directories() {
576    int res = -1;
577
578    // Read current filesystem layout version to handle upgrade paths
579    char version_path[PATH_MAX];
580    snprintf(version_path, PATH_MAX, "%s.layout_version", android_data_dir.path);
581
582    int oldVersion;
583    if (fs_read_atomic_int(version_path, &oldVersion) == -1) {
584        oldVersion = 0;
585    }
586    int version = oldVersion;
587
588    if (version < 2) {
589        SLOGD("Assuming that device has multi-user storage layout; upgrade no longer supported");
590        version = 2;
591    }
592
593    if (ensure_config_user_dirs(0) == -1) {
594        ALOGE("Failed to setup misc for user 0");
595        goto fail;
596    }
597
598    if (version == 2) {
599        ALOGD("Upgrading to /data/misc/user directories");
600
601        char misc_dir[PATH_MAX];
602        snprintf(misc_dir, PATH_MAX, "%smisc", android_data_dir.path);
603
604        char keychain_added_dir[PATH_MAX];
605        snprintf(keychain_added_dir, PATH_MAX, "%s/keychain/cacerts-added", misc_dir);
606
607        char keychain_removed_dir[PATH_MAX];
608        snprintf(keychain_removed_dir, PATH_MAX, "%s/keychain/cacerts-removed", misc_dir);
609
610        DIR *dir;
611        struct dirent *dirent;
612        dir = opendir("/data/user");
613        if (dir != NULL) {
614            while ((dirent = readdir(dir))) {
615                const char *name = dirent->d_name;
616
617                // skip "." and ".."
618                if (name[0] == '.') {
619                    if (name[1] == 0) continue;
620                    if ((name[1] == '.') && (name[2] == 0)) continue;
621                }
622
623                uint32_t user_id = atoi(name);
624
625                // /data/misc/user/<user_id>
626                if (ensure_config_user_dirs(user_id) == -1) {
627                    goto fail;
628                }
629
630                char misc_added_dir[PATH_MAX];
631                snprintf(misc_added_dir, PATH_MAX, "%s/user/%s/cacerts-added", misc_dir, name);
632
633                char misc_removed_dir[PATH_MAX];
634                snprintf(misc_removed_dir, PATH_MAX, "%s/user/%s/cacerts-removed", misc_dir, name);
635
636                uid_t uid = multiuser_get_uid(user_id, AID_SYSTEM);
637                gid_t gid = uid;
638                if (access(keychain_added_dir, F_OK) == 0) {
639                    if (copy_dir_files(keychain_added_dir, misc_added_dir, uid, gid) != 0) {
640                        ALOGE("Some files failed to copy");
641                    }
642                }
643                if (access(keychain_removed_dir, F_OK) == 0) {
644                    if (copy_dir_files(keychain_removed_dir, misc_removed_dir, uid, gid) != 0) {
645                        ALOGE("Some files failed to copy");
646                    }
647                }
648            }
649            closedir(dir);
650
651            if (access(keychain_added_dir, F_OK) == 0) {
652                delete_dir_contents(keychain_added_dir, 1, 0);
653            }
654            if (access(keychain_removed_dir, F_OK) == 0) {
655                delete_dir_contents(keychain_removed_dir, 1, 0);
656            }
657        }
658
659        version = 3;
660    }
661
662    // Persist layout version if changed
663    if (version != oldVersion) {
664        if (fs_write_atomic_int(version_path, version) == -1) {
665            ALOGE("Failed to save version to %s: %s", version_path, strerror(errno));
666            goto fail;
667        }
668    }
669
670    // Success!
671    res = 0;
672
673fail:
674    return res;
675}
676
677static int log_callback(int type, const char *fmt, ...) {
678    va_list ap;
679    int priority;
680
681    switch (type) {
682    case SELINUX_WARNING:
683        priority = ANDROID_LOG_WARN;
684        break;
685    case SELINUX_INFO:
686        priority = ANDROID_LOG_INFO;
687        break;
688    default:
689        priority = ANDROID_LOG_ERROR;
690        break;
691    }
692    va_start(ap, fmt);
693    LOG_PRI_VA(priority, "SELinux", fmt, ap);
694    va_end(ap);
695    return 0;
696}
697
698static int installd_main(const int argc ATTRIBUTE_UNUSED, char *argv[]) {
699    char buf[BUFFER_MAX];
700    struct sockaddr addr;
701    socklen_t alen;
702    int lsocket, s;
703    int selinux_enabled = (is_selinux_enabled() > 0);
704
705    setenv("ANDROID_LOG_TAGS", "*:v", 1);
706    android::base::InitLogging(argv);
707
708    ALOGI("installd firing up\n");
709
710    union selinux_callback cb;
711    cb.func_log = log_callback;
712    selinux_set_callback(SELINUX_CB_LOG, cb);
713
714    if (!initialize_globals()) {
715        ALOGE("Could not initialize globals; exiting.\n");
716        exit(1);
717    }
718
719    if (initialize_directories() < 0) {
720        ALOGE("Could not create directories; exiting.\n");
721        exit(1);
722    }
723
724    if (selinux_enabled && selinux_status_open(true) < 0) {
725        ALOGE("Could not open selinux status; exiting.\n");
726        exit(1);
727    }
728
729    lsocket = android_get_control_socket(SOCKET_PATH);
730    if (lsocket < 0) {
731        ALOGE("Failed to get socket from environment: %s\n", strerror(errno));
732        exit(1);
733    }
734    if (listen(lsocket, 5)) {
735        ALOGE("Listen on socket failed: %s\n", strerror(errno));
736        exit(1);
737    }
738    fcntl(lsocket, F_SETFD, FD_CLOEXEC);
739
740    for (;;) {
741        alen = sizeof(addr);
742        s = accept(lsocket, &addr, &alen);
743        if (s < 0) {
744            ALOGE("Accept failed: %s\n", strerror(errno));
745            continue;
746        }
747        fcntl(s, F_SETFD, FD_CLOEXEC);
748
749        ALOGI("new connection\n");
750        for (;;) {
751            unsigned short count;
752            if (readx(s, &count, sizeof(count))) {
753                ALOGE("failed to read size\n");
754                break;
755            }
756            if ((count < 1) || (count >= BUFFER_MAX)) {
757                ALOGE("invalid size %d\n", count);
758                break;
759            }
760            if (readx(s, buf, count)) {
761                ALOGE("failed to read command\n");
762                break;
763            }
764            buf[count] = 0;
765            if (selinux_enabled && selinux_status_updated() > 0) {
766                selinux_android_seapp_context_reload();
767            }
768            if (execute(s, buf)) break;
769        }
770        ALOGI("closing connection\n");
771        close(s);
772    }
773
774    return 0;
775}
776
777}  // namespace installd
778}  // namespace android
779
780int main(const int argc, char *argv[]) {
781    return android::installd::installd_main(argc, argv);
782}
783