commands.c revision 9bbd70a96397bd5f1445ad6c21977fccfb350dfa 
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 <linux/capability.h>
18#include "installd.h"
19#include <diskusage/dirsize.h>
20
21#ifdef HAVE_SELINUX
22#include <selinux/android.h>
23#endif
24
25/* Directory records that are used in execution of commands. */
26dir_rec_t android_data_dir;
27dir_rec_t android_asec_dir;
28dir_rec_t android_app_dir;
29dir_rec_t android_app_private_dir;
30dir_rec_t android_app_lib_dir;
31dir_rec_t android_media_dir;
32dir_rec_array_t android_system_dirs;
33
34int install(const char *pkgname, uid_t uid, gid_t gid)
35{
36    char pkgdir[PKG_PATH_MAX];
37    char libsymlink[PKG_PATH_MAX];
38    char applibdir[PKG_PATH_MAX];
39
40    if ((uid < AID_SYSTEM) || (gid < AID_SYSTEM)) {
41        ALOGE("invalid uid/gid: %d %d\n", uid, gid);
42        return -1;
43    }
44
45    if (create_pkg_path(pkgdir, pkgname, PKG_DIR_POSTFIX, 0)) {
46        ALOGE("cannot create package path\n");
47        return -1;
48    }
49
50    if (create_pkg_path(libsymlink, pkgname, PKG_LIB_POSTFIX, 0)) {
51        ALOGE("cannot create package lib symlink origin path\n");
52        return -1;
53    }
54
55    if (create_pkg_path_in_dir(applibdir, &android_app_lib_dir, pkgname, PKG_DIR_POSTFIX)) {
56        ALOGE("cannot create package lib symlink dest path\n");
57        return -1;
58    }
59
60    if (mkdir(pkgdir, 0751) < 0) {
61        ALOGE("cannot create dir '%s': %s\n", pkgdir, strerror(errno));
62        return -1;
63    }
64    if (chmod(pkgdir, 0751) < 0) {
65        ALOGE("cannot chmod dir '%s': %s\n", pkgdir, strerror(errno));
66        unlink(pkgdir);
67        return -1;
68    }
69
70    if (symlink(applibdir, libsymlink) < 0) {
71        ALOGE("couldn't symlink directory '%s' -> '%s': %s\n", libsymlink, applibdir,
72                strerror(errno));
73        unlink(pkgdir);
74        return -1;
75    }
76
77#ifdef HAVE_SELINUX
78    if (selinux_android_setfilecon(pkgdir, pkgname, uid) < 0) {
79        ALOGE("cannot setfilecon dir '%s': %s\n", pkgdir, strerror(errno));
80        unlink(libsymlink);
81        unlink(pkgdir);
82        return -1;
83    }
84#endif
85
86    if (chown(pkgdir, uid, gid) < 0) {
87        ALOGE("cannot chown dir '%s': %s\n", pkgdir, strerror(errno));
88        unlink(libsymlink);
89        unlink(pkgdir);
90        return -1;
91    }
92
93    return 0;
94}
95
96int uninstall(const char *pkgname, uid_t persona)
97{
98    char pkgdir[PKG_PATH_MAX];
99
100    if (create_pkg_path(pkgdir, pkgname, PKG_DIR_POSTFIX, persona))
101        return -1;
102
103    /* delete contents AND directory, no exceptions */
104    return delete_dir_contents(pkgdir, 1, NULL);
105}
106
107int renamepkg(const char *oldpkgname, const char *newpkgname)
108{
109    char oldpkgdir[PKG_PATH_MAX];
110    char newpkgdir[PKG_PATH_MAX];
111
112    if (create_pkg_path(oldpkgdir, oldpkgname, PKG_DIR_POSTFIX, 0))
113        return -1;
114    if (create_pkg_path(newpkgdir, newpkgname, PKG_DIR_POSTFIX, 0))
115        return -1;
116
117    if (rename(oldpkgdir, newpkgdir) < 0) {
118        ALOGE("cannot rename dir '%s' to '%s': %s\n", oldpkgdir, newpkgdir, strerror(errno));
119        return -errno;
120    }
121    return 0;
122}
123
124int fix_uid(const char *pkgname, uid_t uid, gid_t gid)
125{
126    char pkgdir[PKG_PATH_MAX];
127    struct stat s;
128    int rc = 0;
129
130    if ((uid < AID_SYSTEM) || (gid < AID_SYSTEM)) {
131        ALOGE("invalid uid/gid: %d %d\n", uid, gid);
132        return -1;
133    }
134
135    if (create_pkg_path(pkgdir, pkgname, PKG_DIR_POSTFIX, 0)) {
136        ALOGE("cannot create package path\n");
137        return -1;
138    }
139
140    if (stat(pkgdir, &s) < 0) return -1;
141
142    if (s.st_uid != 0 || s.st_gid != 0) {
143        ALOGE("fixing uid of non-root pkg: %s %d %d\n", pkgdir, s.st_uid, s.st_gid);
144        return -1;
145    }
146
147    if (chmod(pkgdir, 0751) < 0) {
148        ALOGE("cannot chmod dir '%s': %s\n", pkgdir, strerror(errno));
149        unlink(pkgdir);
150        return -errno;
151    }
152    if (chown(pkgdir, uid, gid) < 0) {
153        ALOGE("cannot chown dir '%s': %s\n", pkgdir, strerror(errno));
154        unlink(pkgdir);
155        return -errno;
156    }
157
158    return 0;
159}
160
161int delete_user_data(const char *pkgname, uid_t persona)
162{
163    char pkgdir[PKG_PATH_MAX];
164
165    if (create_pkg_path(pkgdir, pkgname, PKG_DIR_POSTFIX, persona))
166        return -1;
167
168    /* delete contents, excluding "lib", but not the directory itself */
169    return delete_dir_contents(pkgdir, 0, "lib");
170}
171
172int make_user_data(const char *pkgname, uid_t uid, uid_t persona)
173{
174    char pkgdir[PKG_PATH_MAX];
175
176    // Create the data dir for the package
177    if (create_pkg_path(pkgdir, pkgname, PKG_DIR_POSTFIX, persona)) {
178        return -1;
179    }
180    if (mkdir(pkgdir, 0751) < 0) {
181        ALOGE("cannot create dir '%s': %s\n", pkgdir, strerror(errno));
182        return -errno;
183    }
184    if (chmod(pkgdir, 0751) < 0) {
185        ALOGE("cannot chmod dir '%s': %s\n", pkgdir, strerror(errno));
186        unlink(pkgdir);
187        return -errno;
188    }
189    if (chown(pkgdir, uid, uid) < 0) {
190        ALOGE("cannot chown dir '%s': %s\n", pkgdir, strerror(errno));
191        unlink(pkgdir);
192        return -errno;
193    }
194
195#ifdef HAVE_SELINUX
196    if (selinux_android_setfilecon(pkgdir, pkgname, uid) < 0) {
197        ALOGE("cannot setfilecon dir '%s': %s\n", pkgdir, strerror(errno));
198        unlink(pkgdir);
199        return -errno;
200    }
201#endif
202
203    return 0;
204}
205
206int delete_persona(uid_t persona)
207{
208    char data_path[PKG_PATH_MAX];
209    if (create_persona_path(data_path, persona)) {
210        return -1;
211    }
212    if (delete_dir_contents(data_path, 1, NULL)) {
213        return -1;
214    }
215
216    char media_path[PATH_MAX];
217    if (create_persona_media_path(media_path, (userid_t) persona) == -1) {
218        return -1;
219    }
220    if (delete_dir_contents(media_path, 1, NULL) == -1) {
221        return -1;
222    }
223
224    return 0;
225}
226
227int clone_persona_data(uid_t src_persona, uid_t target_persona, int copy)
228{
229    char src_data_dir[PKG_PATH_MAX];
230    char pkg_path[PKG_PATH_MAX];
231    DIR *d;
232    struct dirent *de;
233    struct stat s;
234    uid_t uid;
235
236    if (create_persona_path(src_data_dir, src_persona)) {
237        return -1;
238    }
239
240    d = opendir(src_data_dir);
241    if (d != NULL) {
242        while ((de = readdir(d))) {
243            const char *name = de->d_name;
244
245            if (de->d_type == DT_DIR) {
246                int subfd;
247                    /* always skip "." and ".." */
248                if (name[0] == '.') {
249                    if (name[1] == 0) continue;
250                    if ((name[1] == '.') && (name[2] == 0)) continue;
251                }
252                /* Create the full path to the package's data dir */
253                create_pkg_path(pkg_path, name, PKG_DIR_POSTFIX, src_persona);
254                /* Get the file stat */
255                if (stat(pkg_path, &s) < 0) continue;
256                /* Get the uid of the package */
257                ALOGI("Adding datadir for uid = %d\n", s.st_uid);
258                uid = (uid_t) s.st_uid % PER_USER_RANGE;
259                /* Create the directory for the target */
260                make_user_data(name, uid + target_persona * PER_USER_RANGE,
261                               target_persona);
262            }
263        }
264        closedir(d);
265    }
266
267    if (ensure_media_user_dirs((userid_t) target_persona) == -1) {
268        return -1;
269    }
270
271    return 0;
272}
273
274int delete_cache(const char *pkgname)
275{
276    char cachedir[PKG_PATH_MAX];
277
278    if (create_pkg_path(cachedir, pkgname, CACHE_DIR_POSTFIX, 0))
279        return -1;
280
281        /* delete contents, not the directory, no exceptions */
282    return delete_dir_contents(cachedir, 0, 0);
283}
284
285/* Try to ensure free_size bytes of storage are available.
286 * Returns 0 on success.
287 * This is rather simple-minded because doing a full LRU would
288 * be potentially memory-intensive, and without atime it would
289 * also require that apps constantly modify file metadata even
290 * when just reading from the cache, which is pretty awful.
291 */
292int free_cache(int64_t free_size)
293{
294    cache_t* cache;
295    int64_t avail;
296    DIR *d;
297    struct dirent *de;
298    char tmpdir[PATH_MAX];
299    char *dirpos;
300
301    avail = data_disk_free();
302    if (avail < 0) return -1;
303
304    ALOGI("free_cache(%" PRId64 ") avail %" PRId64 "\n", free_size, avail);
305    if (avail >= free_size) return 0;
306
307    cache = start_cache_collection();
308
309    // Collect cache files for primary user.
310    if (create_persona_path(tmpdir, 0) == 0) {
311        //ALOGI("adding cache files from %s\n", tmpdir);
312        add_cache_files(cache, tmpdir, "cache");
313    }
314
315    // Search for other users and add any cache files from them.
316    snprintf(tmpdir, sizeof(tmpdir), "%s%s", android_data_dir.path,
317            SECONDARY_USER_PREFIX);
318    dirpos = tmpdir + strlen(tmpdir);
319    d = opendir(tmpdir);
320    if (d != NULL) {
321        while ((de = readdir(d))) {
322            if (de->d_type == DT_DIR) {
323                const char *name = de->d_name;
324                    /* always skip "." and ".." */
325                if (name[0] == '.') {
326                    if (name[1] == 0) continue;
327                    if ((name[1] == '.') && (name[2] == 0)) continue;
328                }
329                if ((strlen(name)+(dirpos-tmpdir)) < (sizeof(tmpdir)-1)) {
330                    strcpy(dirpos, name);
331                    //ALOGI("adding cache files from %s\n", tmpdir);
332                    add_cache_files(cache, tmpdir, "cache");
333                } else {
334                    ALOGW("Path exceeds limit: %s%s", tmpdir, name);
335                }
336            }
337        }
338        closedir(d);
339    }
340
341    // Collect cache files on external storage (if it is mounted as part
342    // of the internal storage).
343    strcpy(tmpdir, android_media_dir.path);
344    if (lookup_media_dir(tmpdir, "Android") == 0
345            && lookup_media_dir(tmpdir, "data") == 0) {
346        //ALOGI("adding cache files from %s\n", tmpdir);
347        add_cache_files(cache, tmpdir, "cache");
348    }
349
350    clear_cache_files(cache, free_size);
351    finish_cache_collection(cache);
352
353    return data_disk_free() >= free_size ? 0 : -1;
354}
355
356int move_dex(const char *src, const char *dst)
357{
358    char src_dex[PKG_PATH_MAX];
359    char dst_dex[PKG_PATH_MAX];
360
361    if (validate_apk_path(src)) return -1;
362    if (validate_apk_path(dst)) return -1;
363
364    if (create_cache_path(src_dex, src)) return -1;
365    if (create_cache_path(dst_dex, dst)) return -1;
366
367    ALOGV("move %s -> %s\n", src_dex, dst_dex);
368    if (rename(src_dex, dst_dex) < 0) {
369        ALOGE("Couldn't move %s: %s\n", src_dex, strerror(errno));
370        return -1;
371    } else {
372        return 0;
373    }
374}
375
376int rm_dex(const char *path)
377{
378    char dex_path[PKG_PATH_MAX];
379
380    if (validate_apk_path(path)) return -1;
381    if (create_cache_path(dex_path, path)) return -1;
382
383    ALOGV("unlink %s\n", dex_path);
384    if (unlink(dex_path) < 0) {
385        ALOGE("Couldn't unlink %s: %s\n", dex_path, strerror(errno));
386        return -1;
387    } else {
388        return 0;
389    }
390}
391
392int get_size(const char *pkgname, int persona, const char *apkpath,
393             const char *fwdlock_apkpath, const char *asecpath,
394             int64_t *_codesize, int64_t *_datasize, int64_t *_cachesize,
395             int64_t* _asecsize)
396{
397    DIR *d;
398    int dfd;
399    struct dirent *de;
400    struct stat s;
401    char path[PKG_PATH_MAX];
402
403    int64_t codesize = 0;
404    int64_t datasize = 0;
405    int64_t cachesize = 0;
406    int64_t asecsize = 0;
407
408        /* count the source apk as code -- but only if it's not
409         * on the /system partition and its not on the sdcard.
410         */
411    if (validate_system_app_path(apkpath) &&
412            strncmp(apkpath, android_asec_dir.path, android_asec_dir.len) != 0) {
413        if (stat(apkpath, &s) == 0) {
414            codesize += stat_size(&s);
415        }
416    }
417        /* count the forward locked apk as code if it is given
418         */
419    if (fwdlock_apkpath != NULL && fwdlock_apkpath[0] != '!') {
420        if (stat(fwdlock_apkpath, &s) == 0) {
421            codesize += stat_size(&s);
422        }
423    }
424        /* count the cached dexfile as code */
425    if (!create_cache_path(path, apkpath)) {
426        if (stat(path, &s) == 0) {
427            codesize += stat_size(&s);
428        }
429    }
430
431        /* compute asec size if it is given
432         */
433    if (asecpath != NULL && asecpath[0] != '!') {
434        if (stat(asecpath, &s) == 0) {
435            asecsize += stat_size(&s);
436        }
437    }
438
439    if (create_pkg_path(path, pkgname, PKG_DIR_POSTFIX, persona)) {
440        goto done;
441    }
442
443    d = opendir(path);
444    if (d == NULL) {
445        goto done;
446    }
447    dfd = dirfd(d);
448
449    /* most stuff in the pkgdir is data, except for the "cache"
450     * directory and below, which is cache, and the "lib" directory
451     * and below, which is code...
452     */
453    while ((de = readdir(d))) {
454        const char *name = de->d_name;
455
456        if (de->d_type == DT_DIR) {
457            int subfd;
458                /* always skip "." and ".." */
459            if (name[0] == '.') {
460                if (name[1] == 0) continue;
461                if ((name[1] == '.') && (name[2] == 0)) continue;
462            }
463            subfd = openat(dfd, name, O_RDONLY | O_DIRECTORY);
464            if (subfd >= 0) {
465                int64_t size = calculate_dir_size(subfd);
466                if (!strcmp(name,"lib")) {
467                    codesize += size;
468                } else if(!strcmp(name,"cache")) {
469                    cachesize += size;
470                } else {
471                    datasize += size;
472                }
473            }
474        } else {
475            if (fstatat(dfd, name, &s, AT_SYMLINK_NOFOLLOW) == 0) {
476                datasize += stat_size(&s);
477            }
478        }
479    }
480    closedir(d);
481done:
482    *_codesize = codesize;
483    *_datasize = datasize;
484    *_cachesize = cachesize;
485    *_asecsize = asecsize;
486    return 0;
487}
488
489
490/* a simpler version of dexOptGenerateCacheFileName() */
491int create_cache_path(char path[PKG_PATH_MAX], const char *src)
492{
493    char *tmp;
494    int srclen;
495    int dstlen;
496
497    srclen = strlen(src);
498
499        /* demand that we are an absolute path */
500    if ((src == 0) || (src[0] != '/') || strstr(src,"..")) {
501        return -1;
502    }
503
504    if (srclen > PKG_PATH_MAX) {        // XXX: PKG_NAME_MAX?
505        return -1;
506    }
507
508    dstlen = srclen + strlen(DALVIK_CACHE_PREFIX) +
509        strlen(DALVIK_CACHE_POSTFIX) + 1;
510
511    if (dstlen > PKG_PATH_MAX) {
512        return -1;
513    }
514
515    sprintf(path,"%s%s%s",
516            DALVIK_CACHE_PREFIX,
517            src + 1, /* skip the leading / */
518            DALVIK_CACHE_POSTFIX);
519
520    for(tmp = path + strlen(DALVIK_CACHE_PREFIX); *tmp; tmp++) {
521        if (*tmp == '/') {
522            *tmp = '@';
523        }
524    }
525
526    return 0;
527}
528
529static void run_dexopt(int zip_fd, int odex_fd, const char* input_file_name,
530    const char* dexopt_flags)
531{
532    static const char* DEX_OPT_BIN = "/system/bin/dexopt";
533    static const int MAX_INT_LEN = 12;      // '-'+10dig+'\0' -OR- 0x+8dig
534    char zip_num[MAX_INT_LEN];
535    char odex_num[MAX_INT_LEN];
536
537    sprintf(zip_num, "%d", zip_fd);
538    sprintf(odex_num, "%d", odex_fd);
539
540    execl(DEX_OPT_BIN, DEX_OPT_BIN, "--zip", zip_num, odex_num, input_file_name,
541        dexopt_flags, (char*) NULL);
542    ALOGE("execl(%s) failed: %s\n", DEX_OPT_BIN, strerror(errno));
543}
544
545static int wait_dexopt(pid_t pid, const char* apk_path)
546{
547    int status;
548    pid_t got_pid;
549
550    /*
551     * Wait for the optimization process to finish.
552     */
553    while (1) {
554        got_pid = waitpid(pid, &status, 0);
555        if (got_pid == -1 && errno == EINTR) {
556            printf("waitpid interrupted, retrying\n");
557        } else {
558            break;
559        }
560    }
561    if (got_pid != pid) {
562        ALOGW("waitpid failed: wanted %d, got %d: %s\n",
563            (int) pid, (int) got_pid, strerror(errno));
564        return 1;
565    }
566
567    if (WIFEXITED(status) && WEXITSTATUS(status) == 0) {
568        ALOGV("DexInv: --- END '%s' (success) ---\n", apk_path);
569        return 0;
570    } else {
571        ALOGW("DexInv: --- END '%s' --- status=0x%04x, process failed\n",
572            apk_path, status);
573        return status;      /* always nonzero */
574    }
575}
576
577int dexopt(const char *apk_path, uid_t uid, int is_public)
578{
579    struct utimbuf ut;
580    struct stat apk_stat, dex_stat;
581    char dex_path[PKG_PATH_MAX];
582    char dexopt_flags[PROPERTY_VALUE_MAX];
583    char *end;
584    int res, zip_fd=-1, odex_fd=-1;
585
586        /* Before anything else: is there a .odex file?  If so, we have
587         * pre-optimized the apk and there is nothing to do here.
588         */
589    if (strlen(apk_path) >= (PKG_PATH_MAX - 8)) {
590        return -1;
591    }
592
593    /* platform-specific flags affecting optimization and verification */
594    property_get("dalvik.vm.dexopt-flags", dexopt_flags, "");
595
596    strcpy(dex_path, apk_path);
597    end = strrchr(dex_path, '.');
598    if (end != NULL) {
599        strcpy(end, ".odex");
600        if (stat(dex_path, &dex_stat) == 0) {
601            return 0;
602        }
603    }
604
605    if (create_cache_path(dex_path, apk_path)) {
606        return -1;
607    }
608
609    memset(&apk_stat, 0, sizeof(apk_stat));
610    stat(apk_path, &apk_stat);
611
612    zip_fd = open(apk_path, O_RDONLY, 0);
613    if (zip_fd < 0) {
614        ALOGE("dexopt cannot open '%s' for input\n", apk_path);
615        return -1;
616    }
617
618    unlink(dex_path);
619    odex_fd = open(dex_path, O_RDWR | O_CREAT | O_EXCL, 0644);
620    if (odex_fd < 0) {
621        ALOGE("dexopt cannot open '%s' for output\n", dex_path);
622        goto fail;
623    }
624    if (fchmod(odex_fd,
625               S_IRUSR|S_IWUSR|S_IRGRP |
626               (is_public ? S_IROTH : 0)) < 0) {
627        ALOGE("dexopt cannot chmod '%s'\n", dex_path);
628        goto fail;
629    }
630    if (fchown(odex_fd, AID_SYSTEM, uid) < 0) {
631        ALOGE("dexopt cannot chown '%s'\n", dex_path);
632        goto fail;
633    }
634
635    ALOGV("DexInv: --- BEGIN '%s' ---\n", apk_path);
636
637    pid_t pid;
638    pid = fork();
639    if (pid == 0) {
640        /* child -- drop privileges before continuing */
641        if (setgid(uid) != 0) {
642            ALOGE("setgid(%d) failed during dexopt\n", uid);
643            exit(64);
644        }
645        if (setuid(uid) != 0) {
646            ALOGE("setuid(%d) during dexopt\n", uid);
647            exit(65);
648        }
649        // drop capabilities
650        struct __user_cap_header_struct capheader;
651        struct __user_cap_data_struct capdata[2];
652        memset(&capheader, 0, sizeof(capheader));
653        memset(&capdata, 0, sizeof(capdata));
654        capheader.version = _LINUX_CAPABILITY_VERSION_3;
655        if (capset(&capheader, &capdata[0]) < 0) {
656            ALOGE("capset failed: %s\n", strerror(errno));
657            exit(66);
658        }
659        if (flock(odex_fd, LOCK_EX | LOCK_NB) != 0) {
660            ALOGE("flock(%s) failed: %s\n", dex_path, strerror(errno));
661            exit(67);
662        }
663
664        run_dexopt(zip_fd, odex_fd, apk_path, dexopt_flags);
665        exit(68);   /* only get here on exec failure */
666    } else {
667        res = wait_dexopt(pid, apk_path);
668        if (res != 0) {
669            ALOGE("dexopt failed on '%s' res = %d\n", dex_path, res);
670            goto fail;
671        }
672    }
673
674    ut.actime = apk_stat.st_atime;
675    ut.modtime = apk_stat.st_mtime;
676    utime(dex_path, &ut);
677
678    close(odex_fd);
679    close(zip_fd);
680    return 0;
681
682fail:
683    if (odex_fd >= 0) {
684        close(odex_fd);
685        unlink(dex_path);
686    }
687    if (zip_fd >= 0) {
688        close(zip_fd);
689    }
690    return -1;
691}
692
693void mkinnerdirs(char* path, int basepos, mode_t mode, int uid, int gid,
694        struct stat* statbuf)
695{
696    while (path[basepos] != 0) {
697        if (path[basepos] == '/') {
698            path[basepos] = 0;
699            if (lstat(path, statbuf) < 0) {
700                ALOGV("Making directory: %s\n", path);
701                if (mkdir(path, mode) == 0) {
702                    chown(path, uid, gid);
703                } else {
704                    ALOGW("Unable to make directory %s: %s\n", path, strerror(errno));
705                }
706            }
707            path[basepos] = '/';
708            basepos++;
709        }
710        basepos++;
711    }
712}
713
714int movefileordir(char* srcpath, char* dstpath, int dstbasepos,
715        int dstuid, int dstgid, struct stat* statbuf)
716{
717    DIR *d;
718    struct dirent *de;
719    int res;
720
721    int srcend = strlen(srcpath);
722    int dstend = strlen(dstpath);
723
724    if (lstat(srcpath, statbuf) < 0) {
725        ALOGW("Unable to stat %s: %s\n", srcpath, strerror(errno));
726        return 1;
727    }
728
729    if ((statbuf->st_mode&S_IFDIR) == 0) {
730        mkinnerdirs(dstpath, dstbasepos, S_IRWXU|S_IRWXG|S_IXOTH,
731                dstuid, dstgid, statbuf);
732        ALOGV("Renaming %s to %s (uid %d)\n", srcpath, dstpath, dstuid);
733        if (rename(srcpath, dstpath) >= 0) {
734            if (chown(dstpath, dstuid, dstgid) < 0) {
735                ALOGE("cannot chown %s: %s\n", dstpath, strerror(errno));
736                unlink(dstpath);
737                return 1;
738            }
739        } else {
740            ALOGW("Unable to rename %s to %s: %s\n",
741                srcpath, dstpath, strerror(errno));
742            return 1;
743        }
744        return 0;
745    }
746
747    d = opendir(srcpath);
748    if (d == NULL) {
749        ALOGW("Unable to opendir %s: %s\n", srcpath, strerror(errno));
750        return 1;
751    }
752
753    res = 0;
754
755    while ((de = readdir(d))) {
756        const char *name = de->d_name;
757            /* always skip "." and ".." */
758        if (name[0] == '.') {
759            if (name[1] == 0) continue;
760            if ((name[1] == '.') && (name[2] == 0)) continue;
761        }
762
763        if ((srcend+strlen(name)) >= (PKG_PATH_MAX-2)) {
764            ALOGW("Source path too long; skipping: %s/%s\n", srcpath, name);
765            continue;
766        }
767
768        if ((dstend+strlen(name)) >= (PKG_PATH_MAX-2)) {
769            ALOGW("Destination path too long; skipping: %s/%s\n", dstpath, name);
770            continue;
771        }
772
773        srcpath[srcend] = dstpath[dstend] = '/';
774        strcpy(srcpath+srcend+1, name);
775        strcpy(dstpath+dstend+1, name);
776
777        if (movefileordir(srcpath, dstpath, dstbasepos, dstuid, dstgid, statbuf) != 0) {
778            res = 1;
779        }
780
781        // Note: we will be leaving empty directories behind in srcpath,
782        // but that is okay, the package manager will be erasing all of the
783        // data associated with .apks that disappear.
784
785        srcpath[srcend] = dstpath[dstend] = 0;
786    }
787
788    closedir(d);
789    return res;
790}
791
792int movefiles()
793{
794    DIR *d;
795    int dfd, subfd;
796    struct dirent *de;
797    struct stat s;
798    char buf[PKG_PATH_MAX+1];
799    int bufp, bufe, bufi, readlen;
800
801    char srcpkg[PKG_NAME_MAX];
802    char dstpkg[PKG_NAME_MAX];
803    char srcpath[PKG_PATH_MAX];
804    char dstpath[PKG_PATH_MAX];
805    int dstuid=-1, dstgid=-1;
806    int hasspace;
807
808    d = opendir(UPDATE_COMMANDS_DIR_PREFIX);
809    if (d == NULL) {
810        goto done;
811    }
812    dfd = dirfd(d);
813
814        /* Iterate through all files in the directory, executing the
815         * file movements requested there-in.
816         */
817    while ((de = readdir(d))) {
818        const char *name = de->d_name;
819
820        if (de->d_type == DT_DIR) {
821            continue;
822        } else {
823            subfd = openat(dfd, name, O_RDONLY);
824            if (subfd < 0) {
825                ALOGW("Unable to open update commands at %s%s\n",
826                        UPDATE_COMMANDS_DIR_PREFIX, name);
827                continue;
828            }
829
830            bufp = 0;
831            bufe = 0;
832            buf[PKG_PATH_MAX] = 0;
833            srcpkg[0] = dstpkg[0] = 0;
834            while (1) {
835                bufi = bufp;
836                while (bufi < bufe && buf[bufi] != '\n') {
837                    bufi++;
838                }
839                if (bufi < bufe) {
840                    buf[bufi] = 0;
841                    ALOGV("Processing line: %s\n", buf+bufp);
842                    hasspace = 0;
843                    while (bufp < bufi && isspace(buf[bufp])) {
844                        hasspace = 1;
845                        bufp++;
846                    }
847                    if (buf[bufp] == '#' || bufp == bufi) {
848                        // skip comments and empty lines.
849                    } else if (hasspace) {
850                        if (dstpkg[0] == 0) {
851                            ALOGW("Path before package line in %s%s: %s\n",
852                                    UPDATE_COMMANDS_DIR_PREFIX, name, buf+bufp);
853                        } else if (srcpkg[0] == 0) {
854                            // Skip -- source package no longer exists.
855                        } else {
856                            ALOGV("Move file: %s (from %s to %s)\n", buf+bufp, srcpkg, dstpkg);
857                            if (!create_move_path(srcpath, srcpkg, buf+bufp, 0) &&
858                                    !create_move_path(dstpath, dstpkg, buf+bufp, 0)) {
859                                movefileordir(srcpath, dstpath,
860                                        strlen(dstpath)-strlen(buf+bufp),
861                                        dstuid, dstgid, &s);
862                            }
863                        }
864                    } else {
865                        char* div = strchr(buf+bufp, ':');
866                        if (div == NULL) {
867                            ALOGW("Bad package spec in %s%s; no ':' sep: %s\n",
868                                    UPDATE_COMMANDS_DIR_PREFIX, name, buf+bufp);
869                        } else {
870                            *div = 0;
871                            div++;
872                            if (strlen(buf+bufp) < PKG_NAME_MAX) {
873                                strcpy(dstpkg, buf+bufp);
874                            } else {
875                                srcpkg[0] = dstpkg[0] = 0;
876                                ALOGW("Package name too long in %s%s: %s\n",
877                                        UPDATE_COMMANDS_DIR_PREFIX, name, buf+bufp);
878                            }
879                            if (strlen(div) < PKG_NAME_MAX) {
880                                strcpy(srcpkg, div);
881                            } else {
882                                srcpkg[0] = dstpkg[0] = 0;
883                                ALOGW("Package name too long in %s%s: %s\n",
884                                        UPDATE_COMMANDS_DIR_PREFIX, name, div);
885                            }
886                            if (srcpkg[0] != 0) {
887                                if (!create_pkg_path(srcpath, srcpkg, PKG_DIR_POSTFIX, 0)) {
888                                    if (lstat(srcpath, &s) < 0) {
889                                        // Package no longer exists -- skip.
890                                        srcpkg[0] = 0;
891                                    }
892                                } else {
893                                    srcpkg[0] = 0;
894                                    ALOGW("Can't create path %s in %s%s\n",
895                                            div, UPDATE_COMMANDS_DIR_PREFIX, name);
896                                }
897                                if (srcpkg[0] != 0) {
898                                    if (!create_pkg_path(dstpath, dstpkg, PKG_DIR_POSTFIX, 0)) {
899                                        if (lstat(dstpath, &s) == 0) {
900                                            dstuid = s.st_uid;
901                                            dstgid = s.st_gid;
902                                        } else {
903                                            // Destination package doesn't
904                                            // exist...  due to original-package,
905                                            // this is normal, so don't be
906                                            // noisy about it.
907                                            srcpkg[0] = 0;
908                                        }
909                                    } else {
910                                        srcpkg[0] = 0;
911                                        ALOGW("Can't create path %s in %s%s\n",
912                                                div, UPDATE_COMMANDS_DIR_PREFIX, name);
913                                    }
914                                }
915                                ALOGV("Transfering from %s to %s: uid=%d\n",
916                                    srcpkg, dstpkg, dstuid);
917                            }
918                        }
919                    }
920                    bufp = bufi+1;
921                } else {
922                    if (bufp == 0) {
923                        if (bufp < bufe) {
924                            ALOGW("Line too long in %s%s, skipping: %s\n",
925                                    UPDATE_COMMANDS_DIR_PREFIX, name, buf);
926                        }
927                    } else if (bufp < bufe) {
928                        memcpy(buf, buf+bufp, bufe-bufp);
929                        bufe -= bufp;
930                        bufp = 0;
931                    }
932                    readlen = read(subfd, buf+bufe, PKG_PATH_MAX-bufe);
933                    if (readlen < 0) {
934                        ALOGW("Failure reading update commands in %s%s: %s\n",
935                                UPDATE_COMMANDS_DIR_PREFIX, name, strerror(errno));
936                        break;
937                    } else if (readlen == 0) {
938                        break;
939                    }
940                    bufe += readlen;
941                    buf[bufe] = 0;
942                    ALOGV("Read buf: %s\n", buf);
943                }
944            }
945            close(subfd);
946        }
947    }
948    closedir(d);
949done:
950    return 0;
951}
952
953int linklib(const char* dataDir, const char* asecLibDir)
954{
955    char libdir[PKG_PATH_MAX];
956    struct stat s, libStat;
957    int rc = 0;
958
959    const size_t libdirLen = strlen(dataDir) + strlen(PKG_LIB_POSTFIX);
960    if (libdirLen >= PKG_PATH_MAX) {
961        ALOGE("library dir len too large");
962        return -1;
963    }
964
965    if (snprintf(libdir, sizeof(libdir), "%s%s", dataDir, PKG_LIB_POSTFIX) != (ssize_t)libdirLen) {
966        ALOGE("library dir not written successfully: %s\n", strerror(errno));
967        return -1;
968    }
969
970    if (stat(dataDir, &s) < 0) return -1;
971
972    if (chown(dataDir, AID_INSTALL, AID_INSTALL) < 0) {
973        ALOGE("failed to chown '%s': %s\n", dataDir, strerror(errno));
974        return -1;
975    }
976
977    if (chmod(dataDir, 0700) < 0) {
978        ALOGE("linklib() 1: failed to chmod '%s': %s\n", dataDir, strerror(errno));
979        rc = -1;
980        goto out;
981    }
982
983    if (lstat(libdir, &libStat) < 0) {
984        ALOGE("couldn't stat lib dir: %s\n", strerror(errno));
985        rc = -1;
986        goto out;
987    }
988
989    if (S_ISDIR(libStat.st_mode)) {
990        if (delete_dir_contents(libdir, 1, 0) < 0) {
991            rc = -1;
992            goto out;
993        }
994    } else if (S_ISLNK(libStat.st_mode)) {
995        if (unlink(libdir) < 0) {
996            rc = -1;
997            goto out;
998        }
999    }
1000
1001    if (symlink(asecLibDir, libdir) < 0) {
1002        ALOGE("couldn't symlink directory '%s' -> '%s': %s\n", libdir, asecLibDir, strerror(errno));
1003        rc = -errno;
1004        goto out;
1005    }
1006
1007    if (lchown(libdir, AID_SYSTEM, AID_SYSTEM) < 0) {
1008        ALOGE("cannot chown dir '%s': %s\n", libdir, strerror(errno));
1009        unlink(libdir);
1010        rc = -errno;
1011        goto out;
1012    }
1013
1014out:
1015    if (chmod(dataDir, s.st_mode) < 0) {
1016        ALOGE("linklib() 2: failed to chmod '%s': %s\n", dataDir, strerror(errno));
1017        rc = -errno;
1018    }
1019
1020    if (chown(dataDir, s.st_uid, s.st_gid) < 0) {
1021        ALOGE("failed to chown '%s' : %s\n", dataDir, strerror(errno));
1022        return -errno;
1023    }
1024
1025    return rc;
1026}
1027