commands.c revision 4d3fd4e9988c0eb284dd5104c4dea757f723c716 
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 <sys/capability.h>
18#include "installd.h"
19#include <diskusage/dirsize.h>
20#include <selinux/android.h>
21
22/* Directory records that are used in execution of commands. */
23dir_rec_t android_data_dir;
24dir_rec_t android_asec_dir;
25dir_rec_t android_app_dir;
26dir_rec_t android_app_private_dir;
27dir_rec_t android_app_lib_dir;
28dir_rec_t android_media_dir;
29dir_rec_array_t android_system_dirs;
30
31int install(const char *pkgname, uid_t uid, gid_t gid, const char *seinfo)
32{
33    char pkgdir[PKG_PATH_MAX];
34    char libsymlink[PKG_PATH_MAX];
35    char applibdir[PKG_PATH_MAX];
36    struct stat libStat;
37
38    if ((uid < AID_SYSTEM) || (gid < AID_SYSTEM)) {
39        ALOGE("invalid uid/gid: %d %d\n", uid, gid);
40        return -1;
41    }
42
43    if (create_pkg_path(pkgdir, pkgname, PKG_DIR_POSTFIX, 0)) {
44        ALOGE("cannot create package path\n");
45        return -1;
46    }
47
48    if (create_pkg_path(libsymlink, pkgname, PKG_LIB_POSTFIX, 0)) {
49        ALOGE("cannot create package lib symlink origin path\n");
50        return -1;
51    }
52
53    if (create_pkg_path_in_dir(applibdir, &android_app_lib_dir, pkgname, PKG_DIR_POSTFIX)) {
54        ALOGE("cannot create package lib symlink dest path\n");
55        return -1;
56    }
57
58    if (mkdir(pkgdir, 0751) < 0) {
59        ALOGE("cannot create dir '%s': %s\n", pkgdir, strerror(errno));
60        return -1;
61    }
62    if (chmod(pkgdir, 0751) < 0) {
63        ALOGE("cannot chmod dir '%s': %s\n", pkgdir, strerror(errno));
64        unlink(pkgdir);
65        return -1;
66    }
67
68    if (lstat(libsymlink, &libStat) < 0) {
69        if (errno != ENOENT) {
70            ALOGE("couldn't stat lib dir: %s\n", strerror(errno));
71            return -1;
72        }
73    } else {
74        if (S_ISDIR(libStat.st_mode)) {
75            if (delete_dir_contents(libsymlink, 1, 0) < 0) {
76                ALOGE("couldn't delete lib directory during install for: %s", libsymlink);
77                return -1;
78            }
79        } else if (S_ISLNK(libStat.st_mode)) {
80            if (unlink(libsymlink) < 0) {
81                ALOGE("couldn't unlink lib directory during install for: %s", libsymlink);
82                return -1;
83            }
84        }
85    }
86
87    if (symlink(applibdir, libsymlink) < 0) {
88        ALOGE("couldn't symlink directory '%s' -> '%s': %s\n", libsymlink, applibdir,
89                strerror(errno));
90        unlink(pkgdir);
91        return -1;
92    }
93
94    if (selinux_android_setfilecon2(pkgdir, pkgname, seinfo, uid) < 0) {
95        ALOGE("cannot setfilecon dir '%s': %s\n", pkgdir, strerror(errno));
96        unlink(libsymlink);
97        unlink(pkgdir);
98        return -errno;
99    }
100
101    if (chown(pkgdir, uid, gid) < 0) {
102        ALOGE("cannot chown dir '%s': %s\n", pkgdir, strerror(errno));
103        unlink(libsymlink);
104        unlink(pkgdir);
105        return -1;
106    }
107
108    return 0;
109}
110
111int uninstall(const char *pkgname, uid_t persona)
112{
113    char pkgdir[PKG_PATH_MAX];
114
115    if (create_pkg_path(pkgdir, pkgname, PKG_DIR_POSTFIX, persona))
116        return -1;
117
118    /* delete contents AND directory, no exceptions */
119    return delete_dir_contents(pkgdir, 1, NULL);
120}
121
122int renamepkg(const char *oldpkgname, const char *newpkgname)
123{
124    char oldpkgdir[PKG_PATH_MAX];
125    char newpkgdir[PKG_PATH_MAX];
126
127    if (create_pkg_path(oldpkgdir, oldpkgname, PKG_DIR_POSTFIX, 0))
128        return -1;
129    if (create_pkg_path(newpkgdir, newpkgname, PKG_DIR_POSTFIX, 0))
130        return -1;
131
132    if (rename(oldpkgdir, newpkgdir) < 0) {
133        ALOGE("cannot rename dir '%s' to '%s': %s\n", oldpkgdir, newpkgdir, strerror(errno));
134        return -errno;
135    }
136    return 0;
137}
138
139int fix_uid(const char *pkgname, uid_t uid, gid_t gid)
140{
141    char pkgdir[PKG_PATH_MAX];
142    struct stat s;
143    int rc = 0;
144
145    if ((uid < AID_SYSTEM) || (gid < AID_SYSTEM)) {
146        ALOGE("invalid uid/gid: %d %d\n", uid, gid);
147        return -1;
148    }
149
150    if (create_pkg_path(pkgdir, pkgname, PKG_DIR_POSTFIX, 0)) {
151        ALOGE("cannot create package path\n");
152        return -1;
153    }
154
155    if (stat(pkgdir, &s) < 0) return -1;
156
157    if (s.st_uid != 0 || s.st_gid != 0) {
158        ALOGE("fixing uid of non-root pkg: %s %lu %lu\n", pkgdir, s.st_uid, s.st_gid);
159        return -1;
160    }
161
162    if (chmod(pkgdir, 0751) < 0) {
163        ALOGE("cannot chmod dir '%s': %s\n", pkgdir, strerror(errno));
164        unlink(pkgdir);
165        return -errno;
166    }
167    if (chown(pkgdir, uid, gid) < 0) {
168        ALOGE("cannot chown dir '%s': %s\n", pkgdir, strerror(errno));
169        unlink(pkgdir);
170        return -errno;
171    }
172
173    return 0;
174}
175
176int delete_user_data(const char *pkgname, uid_t persona)
177{
178    char pkgdir[PKG_PATH_MAX];
179
180    if (create_pkg_path(pkgdir, pkgname, PKG_DIR_POSTFIX, persona))
181        return -1;
182
183    /* delete contents, excluding "lib", but not the directory itself */
184    return delete_dir_contents(pkgdir, 0, "lib");
185}
186
187int make_user_data(const char *pkgname, uid_t uid, uid_t persona)
188{
189    char pkgdir[PKG_PATH_MAX];
190    char applibdir[PKG_PATH_MAX];
191    char libsymlink[PKG_PATH_MAX];
192    struct stat libStat;
193
194    // Create the data dir for the package
195    if (create_pkg_path(pkgdir, pkgname, PKG_DIR_POSTFIX, persona)) {
196        return -1;
197    }
198    if (create_pkg_path(libsymlink, pkgname, PKG_LIB_POSTFIX, persona)) {
199        ALOGE("cannot create package lib symlink origin path\n");
200        return -1;
201    }
202    if (create_pkg_path_in_dir(applibdir, &android_app_lib_dir, pkgname, PKG_DIR_POSTFIX)) {
203        ALOGE("cannot create package lib symlink dest path\n");
204        return -1;
205    }
206
207    if (mkdir(pkgdir, 0751) < 0) {
208        ALOGE("cannot create dir '%s': %s\n", pkgdir, strerror(errno));
209        return -errno;
210    }
211    if (chmod(pkgdir, 0751) < 0) {
212        ALOGE("cannot chmod dir '%s': %s\n", pkgdir, strerror(errno));
213        unlink(pkgdir);
214        return -errno;
215    }
216
217    if (lstat(libsymlink, &libStat) < 0) {
218        if (errno != ENOENT) {
219            ALOGE("couldn't stat lib dir for non-primary: %s\n", strerror(errno));
220            unlink(pkgdir);
221            return -1;
222        }
223    } else {
224        if (S_ISDIR(libStat.st_mode)) {
225            if (delete_dir_contents(libsymlink, 1, 0) < 0) {
226                ALOGE("couldn't delete lib directory during install for non-primary: %s",
227                        libsymlink);
228                unlink(pkgdir);
229                return -1;
230            }
231        } else if (S_ISLNK(libStat.st_mode)) {
232            if (unlink(libsymlink) < 0) {
233                ALOGE("couldn't unlink lib directory during install for non-primary: %s",
234                        libsymlink);
235                unlink(pkgdir);
236                return -1;
237            }
238        }
239    }
240
241    if (symlink(applibdir, libsymlink) < 0) {
242        ALOGE("couldn't symlink directory for non-primary '%s' -> '%s': %s\n", libsymlink,
243                applibdir, strerror(errno));
244        unlink(pkgdir);
245        return -1;
246    }
247
248    if (selinux_android_setfilecon(pkgdir, pkgname, uid) < 0) {
249        ALOGE("cannot setfilecon dir '%s': %s\n", pkgdir, strerror(errno));
250        unlink(libsymlink);
251        unlink(pkgdir);
252        return -errno;
253    }
254
255    if (chown(pkgdir, uid, uid) < 0) {
256        ALOGE("cannot chown dir '%s': %s\n", pkgdir, strerror(errno));
257        unlink(libsymlink);
258        unlink(pkgdir);
259        return -errno;
260    }
261
262    return 0;
263}
264
265int delete_persona(uid_t persona)
266{
267    char data_path[PKG_PATH_MAX];
268    if (create_persona_path(data_path, persona)) {
269        return -1;
270    }
271    if (delete_dir_contents(data_path, 1, NULL)) {
272        return -1;
273    }
274
275    char media_path[PATH_MAX];
276    if (create_persona_media_path(media_path, (userid_t) persona) == -1) {
277        return -1;
278    }
279    if (delete_dir_contents(media_path, 1, NULL) == -1) {
280        return -1;
281    }
282
283    return 0;
284}
285
286int delete_cache(const char *pkgname, uid_t persona)
287{
288    char cachedir[PKG_PATH_MAX];
289
290    if (create_pkg_path(cachedir, pkgname, CACHE_DIR_POSTFIX, persona))
291        return -1;
292
293        /* delete contents, not the directory, no exceptions */
294    return delete_dir_contents(cachedir, 0, 0);
295}
296
297/* Try to ensure free_size bytes of storage are available.
298 * Returns 0 on success.
299 * This is rather simple-minded because doing a full LRU would
300 * be potentially memory-intensive, and without atime it would
301 * also require that apps constantly modify file metadata even
302 * when just reading from the cache, which is pretty awful.
303 */
304int free_cache(int64_t free_size)
305{
306    cache_t* cache;
307    int64_t avail;
308    DIR *d;
309    struct dirent *de;
310    char tmpdir[PATH_MAX];
311    char *dirpos;
312
313    avail = data_disk_free();
314    if (avail < 0) return -1;
315
316    ALOGI("free_cache(%" PRId64 ") avail %" PRId64 "\n", free_size, avail);
317    if (avail >= free_size) return 0;
318
319    cache = start_cache_collection();
320
321    // Collect cache files for primary user.
322    if (create_persona_path(tmpdir, 0) == 0) {
323        //ALOGI("adding cache files from %s\n", tmpdir);
324        add_cache_files(cache, tmpdir, "cache");
325    }
326
327    // Search for other users and add any cache files from them.
328    snprintf(tmpdir, sizeof(tmpdir), "%s%s", android_data_dir.path,
329            SECONDARY_USER_PREFIX);
330    dirpos = tmpdir + strlen(tmpdir);
331    d = opendir(tmpdir);
332    if (d != NULL) {
333        while ((de = readdir(d))) {
334            if (de->d_type == DT_DIR) {
335                const char *name = de->d_name;
336                    /* always skip "." and ".." */
337                if (name[0] == '.') {
338                    if (name[1] == 0) continue;
339                    if ((name[1] == '.') && (name[2] == 0)) continue;
340                }
341                if ((strlen(name)+(dirpos-tmpdir)) < (sizeof(tmpdir)-1)) {
342                    strcpy(dirpos, name);
343                    //ALOGI("adding cache files from %s\n", tmpdir);
344                    add_cache_files(cache, tmpdir, "cache");
345                } else {
346                    ALOGW("Path exceeds limit: %s%s", tmpdir, name);
347                }
348            }
349        }
350        closedir(d);
351    }
352
353    // Collect cache files on external storage for all users (if it is mounted as part
354    // of the internal storage).
355    strcpy(tmpdir, android_media_dir.path);
356    dirpos = tmpdir + strlen(tmpdir);
357    d = opendir(tmpdir);
358    if (d != NULL) {
359        while ((de = readdir(d))) {
360            if (de->d_type == DT_DIR) {
361                const char *name = de->d_name;
362                    /* skip any dir that doesn't start with a number, so not a user */
363                if (name[0] < '0' || name[0] > '9') {
364                    continue;
365                }
366                if ((strlen(name)+(dirpos-tmpdir)) < (sizeof(tmpdir)-1)) {
367                    strcpy(dirpos, name);
368                    if (lookup_media_dir(tmpdir, "Android") == 0
369                            && lookup_media_dir(tmpdir, "data") == 0) {
370                        //ALOGI("adding cache files from %s\n", tmpdir);
371                        add_cache_files(cache, tmpdir, "cache");
372                    }
373                } else {
374                    ALOGW("Path exceeds limit: %s%s", tmpdir, name);
375                }
376            }
377        }
378        closedir(d);
379    }
380
381    clear_cache_files(cache, free_size);
382    finish_cache_collection(cache);
383
384    return data_disk_free() >= free_size ? 0 : -1;
385}
386
387int move_dex(const char *src, const char *dst)
388{
389    char src_dex[PKG_PATH_MAX];
390    char dst_dex[PKG_PATH_MAX];
391
392    if (validate_apk_path(src)) return -1;
393    if (validate_apk_path(dst)) return -1;
394
395    if (create_cache_path(src_dex, src)) return -1;
396    if (create_cache_path(dst_dex, dst)) return -1;
397
398    ALOGV("move %s -> %s\n", src_dex, dst_dex);
399    if (rename(src_dex, dst_dex) < 0) {
400        ALOGE("Couldn't move %s: %s\n", src_dex, strerror(errno));
401        return -1;
402    } else {
403        return 0;
404    }
405}
406
407int rm_dex(const char *path)
408{
409    char dex_path[PKG_PATH_MAX];
410
411    if (validate_apk_path(path)) return -1;
412    if (create_cache_path(dex_path, path)) return -1;
413
414    ALOGV("unlink %s\n", dex_path);
415    if (unlink(dex_path) < 0) {
416        ALOGE("Couldn't unlink %s: %s\n", dex_path, strerror(errno));
417        return -1;
418    } else {
419        return 0;
420    }
421}
422
423int get_size(const char *pkgname, int persona, const char *apkpath,
424             const char *fwdlock_apkpath, const char *asecpath,
425             int64_t *_codesize, int64_t *_datasize, int64_t *_cachesize,
426             int64_t* _asecsize)
427{
428    DIR *d;
429    int dfd;
430    struct dirent *de;
431    struct stat s;
432    char path[PKG_PATH_MAX];
433
434    int64_t codesize = 0;
435    int64_t datasize = 0;
436    int64_t cachesize = 0;
437    int64_t asecsize = 0;
438
439        /* count the source apk as code -- but only if it's not
440         * on the /system partition and its not on the sdcard.
441         */
442    if (validate_system_app_path(apkpath) &&
443            strncmp(apkpath, android_asec_dir.path, android_asec_dir.len) != 0) {
444        if (stat(apkpath, &s) == 0) {
445            codesize += stat_size(&s);
446        }
447    }
448        /* count the forward locked apk as code if it is given
449         */
450    if (fwdlock_apkpath != NULL && fwdlock_apkpath[0] != '!') {
451        if (stat(fwdlock_apkpath, &s) == 0) {
452            codesize += stat_size(&s);
453        }
454    }
455        /* count the cached dexfile as code */
456    if (!create_cache_path(path, apkpath)) {
457        if (stat(path, &s) == 0) {
458            codesize += stat_size(&s);
459        }
460    }
461
462        /* add in size of any libraries */
463    if (!create_pkg_path_in_dir(path, &android_app_lib_dir, pkgname, PKG_DIR_POSTFIX)) {
464        d = opendir(path);
465        if (d != NULL) {
466            dfd = dirfd(d);
467            codesize += calculate_dir_size(dfd);
468            closedir(d);
469        }
470    }
471
472        /* compute asec size if it is given
473         */
474    if (asecpath != NULL && asecpath[0] != '!') {
475        if (stat(asecpath, &s) == 0) {
476            asecsize += stat_size(&s);
477        }
478    }
479
480    if (create_pkg_path(path, pkgname, PKG_DIR_POSTFIX, persona)) {
481        goto done;
482    }
483
484    d = opendir(path);
485    if (d == NULL) {
486        goto done;
487    }
488    dfd = dirfd(d);
489
490    /* most stuff in the pkgdir is data, except for the "cache"
491     * directory and below, which is cache, and the "lib" directory
492     * and below, which is code...
493     */
494    while ((de = readdir(d))) {
495        const char *name = de->d_name;
496
497        if (de->d_type == DT_DIR) {
498            int subfd;
499            int64_t statsize = 0;
500            int64_t dirsize = 0;
501                /* always skip "." and ".." */
502            if (name[0] == '.') {
503                if (name[1] == 0) continue;
504                if ((name[1] == '.') && (name[2] == 0)) continue;
505            }
506            if (fstatat(dfd, name, &s, AT_SYMLINK_NOFOLLOW) == 0) {
507                statsize = stat_size(&s);
508            }
509            subfd = openat(dfd, name, O_RDONLY | O_DIRECTORY);
510            if (subfd >= 0) {
511                dirsize = calculate_dir_size(subfd);
512            }
513            if(!strcmp(name,"lib")) {
514                codesize += dirsize + statsize;
515            } else if(!strcmp(name,"cache")) {
516                cachesize += dirsize + statsize;
517            } else {
518                datasize += dirsize + statsize;
519            }
520        } else if (de->d_type == DT_LNK && !strcmp(name,"lib")) {
521            // This is the symbolic link to the application's library
522            // code.  We'll count this as code instead of data, since
523            // it is not something that the app creates.
524            if (fstatat(dfd, name, &s, AT_SYMLINK_NOFOLLOW) == 0) {
525                codesize += stat_size(&s);
526            }
527        } else {
528            if (fstatat(dfd, name, &s, AT_SYMLINK_NOFOLLOW) == 0) {
529                datasize += stat_size(&s);
530            }
531        }
532    }
533    closedir(d);
534done:
535    *_codesize = codesize;
536    *_datasize = datasize;
537    *_cachesize = cachesize;
538    *_asecsize = asecsize;
539    return 0;
540}
541
542
543/* a simpler version of dexOptGenerateCacheFileName() */
544int create_cache_path(char path[PKG_PATH_MAX], const char *src)
545{
546    char *tmp;
547    int srclen;
548    int dstlen;
549
550    srclen = strlen(src);
551
552        /* demand that we are an absolute path */
553    if ((src == 0) || (src[0] != '/') || strstr(src,"..")) {
554        return -1;
555    }
556
557    if (srclen > PKG_PATH_MAX) {        // XXX: PKG_NAME_MAX?
558        return -1;
559    }
560
561    dstlen = srclen + strlen(DALVIK_CACHE_PREFIX) +
562        strlen(DALVIK_CACHE_POSTFIX) + 1;
563
564    if (dstlen > PKG_PATH_MAX) {
565        return -1;
566    }
567
568    sprintf(path,"%s%s%s",
569            DALVIK_CACHE_PREFIX,
570            src + 1, /* skip the leading / */
571            DALVIK_CACHE_POSTFIX);
572
573    for(tmp = path + strlen(DALVIK_CACHE_PREFIX); *tmp; tmp++) {
574        if (*tmp == '/') {
575            *tmp = '@';
576        }
577    }
578
579    return 0;
580}
581
582static void run_dexopt(int zip_fd, int odex_fd, const char* input_file_name,
583    const char* dexopt_flags)
584{
585    static const char* DEX_OPT_BIN = "/system/bin/dexopt";
586    static const int MAX_INT_LEN = 12;      // '-'+10dig+'\0' -OR- 0x+8dig
587    char zip_num[MAX_INT_LEN];
588    char odex_num[MAX_INT_LEN];
589
590    sprintf(zip_num, "%d", zip_fd);
591    sprintf(odex_num, "%d", odex_fd);
592
593    execl(DEX_OPT_BIN, DEX_OPT_BIN, "--zip", zip_num, odex_num, input_file_name,
594        dexopt_flags, (char*) NULL);
595    ALOGE("execl(%s) failed: %s\n", DEX_OPT_BIN, strerror(errno));
596}
597
598static int wait_dexopt(pid_t pid, const char* apk_path)
599{
600    int status;
601    pid_t got_pid;
602
603    /*
604     * Wait for the optimization process to finish.
605     */
606    while (1) {
607        got_pid = waitpid(pid, &status, 0);
608        if (got_pid == -1 && errno == EINTR) {
609            printf("waitpid interrupted, retrying\n");
610        } else {
611            break;
612        }
613    }
614    if (got_pid != pid) {
615        ALOGW("waitpid failed: wanted %d, got %d: %s\n",
616            (int) pid, (int) got_pid, strerror(errno));
617        return 1;
618    }
619
620    if (WIFEXITED(status) && WEXITSTATUS(status) == 0) {
621        ALOGV("DexInv: --- END '%s' (success) ---\n", apk_path);
622        return 0;
623    } else {
624        ALOGW("DexInv: --- END '%s' --- status=0x%04x, process failed\n",
625            apk_path, status);
626        return status;      /* always nonzero */
627    }
628}
629
630int dexopt(const char *apk_path, uid_t uid, int is_public)
631{
632    struct utimbuf ut;
633    struct stat apk_stat, dex_stat;
634    char dex_path[PKG_PATH_MAX];
635    char dexopt_flags[PROPERTY_VALUE_MAX];
636    char *end;
637    int res, zip_fd=-1, odex_fd=-1;
638
639        /* Before anything else: is there a .odex file?  If so, we have
640         * pre-optimized the apk and there is nothing to do here.
641         */
642    if (strlen(apk_path) >= (PKG_PATH_MAX - 8)) {
643        return -1;
644    }
645
646    /* platform-specific flags affecting optimization and verification */
647    property_get("dalvik.vm.dexopt-flags", dexopt_flags, "");
648
649    strcpy(dex_path, apk_path);
650    end = strrchr(dex_path, '.');
651    if (end != NULL) {
652        strcpy(end, ".odex");
653        if (stat(dex_path, &dex_stat) == 0) {
654            return 0;
655        }
656    }
657
658    if (create_cache_path(dex_path, apk_path)) {
659        return -1;
660    }
661
662    memset(&apk_stat, 0, sizeof(apk_stat));
663    stat(apk_path, &apk_stat);
664
665    zip_fd = open(apk_path, O_RDONLY, 0);
666    if (zip_fd < 0) {
667        ALOGE("dexopt cannot open '%s' for input\n", apk_path);
668        return -1;
669    }
670
671    unlink(dex_path);
672    odex_fd = open(dex_path, O_RDWR | O_CREAT | O_EXCL, 0644);
673    if (odex_fd < 0) {
674        ALOGE("dexopt cannot open '%s' for output\n", dex_path);
675        goto fail;
676    }
677    if (fchmod(odex_fd,
678               S_IRUSR|S_IWUSR|S_IRGRP |
679               (is_public ? S_IROTH : 0)) < 0) {
680        ALOGE("dexopt cannot chmod '%s'\n", dex_path);
681        goto fail;
682    }
683    if (fchown(odex_fd, AID_SYSTEM, uid) < 0) {
684        ALOGE("dexopt cannot chown '%s'\n", dex_path);
685        goto fail;
686    }
687
688    ALOGV("DexInv: --- BEGIN '%s' ---\n", apk_path);
689
690    pid_t pid;
691    pid = fork();
692    if (pid == 0) {
693        /* child -- drop privileges before continuing */
694        if (setgid(uid) != 0) {
695            ALOGE("setgid(%d) failed during dexopt\n", uid);
696            exit(64);
697        }
698        if (setuid(uid) != 0) {
699            ALOGE("setuid(%d) during dexopt\n", uid);
700            exit(65);
701        }
702        // drop capabilities
703        struct __user_cap_header_struct capheader;
704        struct __user_cap_data_struct capdata[2];
705        memset(&capheader, 0, sizeof(capheader));
706        memset(&capdata, 0, sizeof(capdata));
707        capheader.version = _LINUX_CAPABILITY_VERSION_3;
708        if (capset(&capheader, &capdata[0]) < 0) {
709            ALOGE("capset failed: %s\n", strerror(errno));
710            exit(66);
711        }
712        if (flock(odex_fd, LOCK_EX | LOCK_NB) != 0) {
713            ALOGE("flock(%s) failed: %s\n", dex_path, strerror(errno));
714            exit(67);
715        }
716
717        run_dexopt(zip_fd, odex_fd, apk_path, dexopt_flags);
718        exit(68);   /* only get here on exec failure */
719    } else {
720        res = wait_dexopt(pid, apk_path);
721        if (res != 0) {
722            ALOGE("dexopt failed on '%s' res = %d\n", dex_path, res);
723            goto fail;
724        }
725    }
726
727    ut.actime = apk_stat.st_atime;
728    ut.modtime = apk_stat.st_mtime;
729    utime(dex_path, &ut);
730
731    close(odex_fd);
732    close(zip_fd);
733    return 0;
734
735fail:
736    if (odex_fd >= 0) {
737        close(odex_fd);
738        unlink(dex_path);
739    }
740    if (zip_fd >= 0) {
741        close(zip_fd);
742    }
743    return -1;
744}
745
746void mkinnerdirs(char* path, int basepos, mode_t mode, int uid, int gid,
747        struct stat* statbuf)
748{
749    while (path[basepos] != 0) {
750        if (path[basepos] == '/') {
751            path[basepos] = 0;
752            if (lstat(path, statbuf) < 0) {
753                ALOGV("Making directory: %s\n", path);
754                if (mkdir(path, mode) == 0) {
755                    chown(path, uid, gid);
756                } else {
757                    ALOGW("Unable to make directory %s: %s\n", path, strerror(errno));
758                }
759            }
760            path[basepos] = '/';
761            basepos++;
762        }
763        basepos++;
764    }
765}
766
767int movefileordir(char* srcpath, char* dstpath, int dstbasepos,
768        int dstuid, int dstgid, struct stat* statbuf)
769{
770    DIR *d;
771    struct dirent *de;
772    int res;
773
774    int srcend = strlen(srcpath);
775    int dstend = strlen(dstpath);
776
777    if (lstat(srcpath, statbuf) < 0) {
778        ALOGW("Unable to stat %s: %s\n", srcpath, strerror(errno));
779        return 1;
780    }
781
782    if ((statbuf->st_mode&S_IFDIR) == 0) {
783        mkinnerdirs(dstpath, dstbasepos, S_IRWXU|S_IRWXG|S_IXOTH,
784                dstuid, dstgid, statbuf);
785        ALOGV("Renaming %s to %s (uid %d)\n", srcpath, dstpath, dstuid);
786        if (rename(srcpath, dstpath) >= 0) {
787            if (chown(dstpath, dstuid, dstgid) < 0) {
788                ALOGE("cannot chown %s: %s\n", dstpath, strerror(errno));
789                unlink(dstpath);
790                return 1;
791            }
792        } else {
793            ALOGW("Unable to rename %s to %s: %s\n",
794                srcpath, dstpath, strerror(errno));
795            return 1;
796        }
797        return 0;
798    }
799
800    d = opendir(srcpath);
801    if (d == NULL) {
802        ALOGW("Unable to opendir %s: %s\n", srcpath, strerror(errno));
803        return 1;
804    }
805
806    res = 0;
807
808    while ((de = readdir(d))) {
809        const char *name = de->d_name;
810            /* always skip "." and ".." */
811        if (name[0] == '.') {
812            if (name[1] == 0) continue;
813            if ((name[1] == '.') && (name[2] == 0)) continue;
814        }
815
816        if ((srcend+strlen(name)) >= (PKG_PATH_MAX-2)) {
817            ALOGW("Source path too long; skipping: %s/%s\n", srcpath, name);
818            continue;
819        }
820
821        if ((dstend+strlen(name)) >= (PKG_PATH_MAX-2)) {
822            ALOGW("Destination path too long; skipping: %s/%s\n", dstpath, name);
823            continue;
824        }
825
826        srcpath[srcend] = dstpath[dstend] = '/';
827        strcpy(srcpath+srcend+1, name);
828        strcpy(dstpath+dstend+1, name);
829
830        if (movefileordir(srcpath, dstpath, dstbasepos, dstuid, dstgid, statbuf) != 0) {
831            res = 1;
832        }
833
834        // Note: we will be leaving empty directories behind in srcpath,
835        // but that is okay, the package manager will be erasing all of the
836        // data associated with .apks that disappear.
837
838        srcpath[srcend] = dstpath[dstend] = 0;
839    }
840
841    closedir(d);
842    return res;
843}
844
845int movefiles()
846{
847    DIR *d;
848    int dfd, subfd;
849    struct dirent *de;
850    struct stat s;
851    char buf[PKG_PATH_MAX+1];
852    int bufp, bufe, bufi, readlen;
853
854    char srcpkg[PKG_NAME_MAX];
855    char dstpkg[PKG_NAME_MAX];
856    char srcpath[PKG_PATH_MAX];
857    char dstpath[PKG_PATH_MAX];
858    int dstuid=-1, dstgid=-1;
859    int hasspace;
860
861    d = opendir(UPDATE_COMMANDS_DIR_PREFIX);
862    if (d == NULL) {
863        goto done;
864    }
865    dfd = dirfd(d);
866
867        /* Iterate through all files in the directory, executing the
868         * file movements requested there-in.
869         */
870    while ((de = readdir(d))) {
871        const char *name = de->d_name;
872
873        if (de->d_type == DT_DIR) {
874            continue;
875        } else {
876            subfd = openat(dfd, name, O_RDONLY);
877            if (subfd < 0) {
878                ALOGW("Unable to open update commands at %s%s\n",
879                        UPDATE_COMMANDS_DIR_PREFIX, name);
880                continue;
881            }
882
883            bufp = 0;
884            bufe = 0;
885            buf[PKG_PATH_MAX] = 0;
886            srcpkg[0] = dstpkg[0] = 0;
887            while (1) {
888                bufi = bufp;
889                while (bufi < bufe && buf[bufi] != '\n') {
890                    bufi++;
891                }
892                if (bufi < bufe) {
893                    buf[bufi] = 0;
894                    ALOGV("Processing line: %s\n", buf+bufp);
895                    hasspace = 0;
896                    while (bufp < bufi && isspace(buf[bufp])) {
897                        hasspace = 1;
898                        bufp++;
899                    }
900                    if (buf[bufp] == '#' || bufp == bufi) {
901                        // skip comments and empty lines.
902                    } else if (hasspace) {
903                        if (dstpkg[0] == 0) {
904                            ALOGW("Path before package line in %s%s: %s\n",
905                                    UPDATE_COMMANDS_DIR_PREFIX, name, buf+bufp);
906                        } else if (srcpkg[0] == 0) {
907                            // Skip -- source package no longer exists.
908                        } else {
909                            ALOGV("Move file: %s (from %s to %s)\n", buf+bufp, srcpkg, dstpkg);
910                            if (!create_move_path(srcpath, srcpkg, buf+bufp, 0) &&
911                                    !create_move_path(dstpath, dstpkg, buf+bufp, 0)) {
912                                movefileordir(srcpath, dstpath,
913                                        strlen(dstpath)-strlen(buf+bufp),
914                                        dstuid, dstgid, &s);
915                            }
916                        }
917                    } else {
918                        char* div = strchr(buf+bufp, ':');
919                        if (div == NULL) {
920                            ALOGW("Bad package spec in %s%s; no ':' sep: %s\n",
921                                    UPDATE_COMMANDS_DIR_PREFIX, name, buf+bufp);
922                        } else {
923                            *div = 0;
924                            div++;
925                            if (strlen(buf+bufp) < PKG_NAME_MAX) {
926                                strcpy(dstpkg, buf+bufp);
927                            } else {
928                                srcpkg[0] = dstpkg[0] = 0;
929                                ALOGW("Package name too long in %s%s: %s\n",
930                                        UPDATE_COMMANDS_DIR_PREFIX, name, buf+bufp);
931                            }
932                            if (strlen(div) < PKG_NAME_MAX) {
933                                strcpy(srcpkg, div);
934                            } else {
935                                srcpkg[0] = dstpkg[0] = 0;
936                                ALOGW("Package name too long in %s%s: %s\n",
937                                        UPDATE_COMMANDS_DIR_PREFIX, name, div);
938                            }
939                            if (srcpkg[0] != 0) {
940                                if (!create_pkg_path(srcpath, srcpkg, PKG_DIR_POSTFIX, 0)) {
941                                    if (lstat(srcpath, &s) < 0) {
942                                        // Package no longer exists -- skip.
943                                        srcpkg[0] = 0;
944                                    }
945                                } else {
946                                    srcpkg[0] = 0;
947                                    ALOGW("Can't create path %s in %s%s\n",
948                                            div, UPDATE_COMMANDS_DIR_PREFIX, name);
949                                }
950                                if (srcpkg[0] != 0) {
951                                    if (!create_pkg_path(dstpath, dstpkg, PKG_DIR_POSTFIX, 0)) {
952                                        if (lstat(dstpath, &s) == 0) {
953                                            dstuid = s.st_uid;
954                                            dstgid = s.st_gid;
955                                        } else {
956                                            // Destination package doesn't
957                                            // exist...  due to original-package,
958                                            // this is normal, so don't be
959                                            // noisy about it.
960                                            srcpkg[0] = 0;
961                                        }
962                                    } else {
963                                        srcpkg[0] = 0;
964                                        ALOGW("Can't create path %s in %s%s\n",
965                                                div, UPDATE_COMMANDS_DIR_PREFIX, name);
966                                    }
967                                }
968                                ALOGV("Transfering from %s to %s: uid=%d\n",
969                                    srcpkg, dstpkg, dstuid);
970                            }
971                        }
972                    }
973                    bufp = bufi+1;
974                } else {
975                    if (bufp == 0) {
976                        if (bufp < bufe) {
977                            ALOGW("Line too long in %s%s, skipping: %s\n",
978                                    UPDATE_COMMANDS_DIR_PREFIX, name, buf);
979                        }
980                    } else if (bufp < bufe) {
981                        memcpy(buf, buf+bufp, bufe-bufp);
982                        bufe -= bufp;
983                        bufp = 0;
984                    }
985                    readlen = read(subfd, buf+bufe, PKG_PATH_MAX-bufe);
986                    if (readlen < 0) {
987                        ALOGW("Failure reading update commands in %s%s: %s\n",
988                                UPDATE_COMMANDS_DIR_PREFIX, name, strerror(errno));
989                        break;
990                    } else if (readlen == 0) {
991                        break;
992                    }
993                    bufe += readlen;
994                    buf[bufe] = 0;
995                    ALOGV("Read buf: %s\n", buf);
996                }
997            }
998            close(subfd);
999        }
1000    }
1001    closedir(d);
1002done:
1003    return 0;
1004}
1005
1006int linklib(const char* pkgname, const char* asecLibDir, int userId)
1007{
1008    char pkgdir[PKG_PATH_MAX];
1009    char libsymlink[PKG_PATH_MAX];
1010    struct stat s, libStat;
1011    int rc = 0;
1012
1013    if (create_pkg_path(pkgdir, pkgname, PKG_DIR_POSTFIX, userId)) {
1014        ALOGE("cannot create package path\n");
1015        return -1;
1016    }
1017    if (create_pkg_path(libsymlink, pkgname, PKG_LIB_POSTFIX, userId)) {
1018        ALOGE("cannot create package lib symlink origin path\n");
1019        return -1;
1020    }
1021
1022    if (stat(pkgdir, &s) < 0) return -1;
1023
1024    if (chown(pkgdir, AID_INSTALL, AID_INSTALL) < 0) {
1025        ALOGE("failed to chown '%s': %s\n", pkgdir, strerror(errno));
1026        return -1;
1027    }
1028
1029    if (chmod(pkgdir, 0700) < 0) {
1030        ALOGE("linklib() 1: failed to chmod '%s': %s\n", pkgdir, strerror(errno));
1031        rc = -1;
1032        goto out;
1033    }
1034
1035    if (lstat(libsymlink, &libStat) < 0) {
1036        if (errno != ENOENT) {
1037            ALOGE("couldn't stat lib dir: %s\n", strerror(errno));
1038            rc = -1;
1039            goto out;
1040        }
1041    } else {
1042        if (S_ISDIR(libStat.st_mode)) {
1043            if (delete_dir_contents(libsymlink, 1, 0) < 0) {
1044                rc = -1;
1045                goto out;
1046            }
1047        } else if (S_ISLNK(libStat.st_mode)) {
1048            if (unlink(libsymlink) < 0) {
1049                ALOGE("couldn't unlink lib dir: %s\n", strerror(errno));
1050                rc = -1;
1051                goto out;
1052            }
1053        }
1054    }
1055
1056    if (symlink(asecLibDir, libsymlink) < 0) {
1057        ALOGE("couldn't symlink directory '%s' -> '%s': %s\n", libsymlink, asecLibDir,
1058                strerror(errno));
1059        rc = -errno;
1060        goto out;
1061    }
1062
1063out:
1064    if (chmod(pkgdir, s.st_mode) < 0) {
1065        ALOGE("linklib() 2: failed to chmod '%s': %s\n", pkgdir, strerror(errno));
1066        rc = -errno;
1067    }
1068
1069    if (chown(pkgdir, s.st_uid, s.st_gid) < 0) {
1070        ALOGE("failed to chown '%s' : %s\n", pkgdir, strerror(errno));
1071        return -errno;
1072    }
1073
1074    return rc;
1075}
1076