commands.c revision 3e319a9962434e1fae86b2180ad210170f02c152 
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 "installd.h"
18
19int install(const char *pkgname, int encrypted_fs_flag, uid_t uid, gid_t gid)
20{
21    char pkgdir[PKG_PATH_MAX];
22    char libdir[PKG_PATH_MAX];
23
24    if ((uid < AID_SYSTEM) || (gid < AID_SYSTEM)) {
25        LOGE("invalid uid/gid: %d %d\n", uid, gid);
26        return -1;
27    }
28
29    if (encrypted_fs_flag == USE_UNENCRYPTED_FS) {
30        if (create_pkg_path(pkgdir, PKG_DIR_PREFIX, pkgname, PKG_DIR_POSTFIX))
31            return -1;
32        if (create_pkg_path(libdir, PKG_LIB_PREFIX, pkgname, PKG_LIB_POSTFIX))
33            return -1;
34    } else {
35        if (create_pkg_path(pkgdir, PKG_SEC_DIR_PREFIX, pkgname, PKG_DIR_POSTFIX))
36            return -1;
37        if (create_pkg_path(libdir, PKG_SEC_LIB_PREFIX, pkgname, PKG_LIB_POSTFIX))
38            return -1;
39    }
40
41    if (mkdir(pkgdir, 0751) < 0) {
42        LOGE("cannot create dir '%s': %s\n", pkgdir, strerror(errno));
43        return -errno;
44    }
45    if (chown(pkgdir, uid, gid) < 0) {
46        LOGE("cannot chown dir '%s': %s\n", pkgdir, strerror(errno));
47        unlink(pkgdir);
48        return -errno;
49    }
50    if (mkdir(libdir, 0755) < 0) {
51        LOGE("cannot create dir '%s': %s\n", libdir, strerror(errno));
52        unlink(pkgdir);
53        return -errno;
54    }
55    if (chown(libdir, AID_SYSTEM, AID_SYSTEM) < 0) {
56        LOGE("cannot chown dir '%s': %s\n", libdir, strerror(errno));
57        unlink(libdir);
58        unlink(pkgdir);
59        return -errno;
60    }
61    return 0;
62}
63
64int uninstall(const char *pkgname, int encrypted_fs_flag)
65{
66    char pkgdir[PKG_PATH_MAX];
67
68    if (encrypted_fs_flag == USE_UNENCRYPTED_FS) {
69        if (create_pkg_path(pkgdir, PKG_DIR_PREFIX, pkgname, PKG_DIR_POSTFIX))
70            return -1;
71    } else {
72        if (create_pkg_path(pkgdir, PKG_SEC_DIR_PREFIX, pkgname, PKG_DIR_POSTFIX))
73            return -1;
74    }
75
76        /* delete contents AND directory, no exceptions */
77    return delete_dir_contents(pkgdir, 1, 0);
78}
79
80int renamepkg(const char *oldpkgname, const char *newpkgname, int encrypted_fs_flag)
81{
82    char oldpkgdir[PKG_PATH_MAX];
83    char newpkgdir[PKG_PATH_MAX];
84
85    if (encrypted_fs_flag == USE_UNENCRYPTED_FS) {
86        if (create_pkg_path(oldpkgdir, PKG_DIR_PREFIX, oldpkgname, PKG_DIR_POSTFIX))
87            return -1;
88        if (create_pkg_path(newpkgdir, PKG_DIR_PREFIX, newpkgname, PKG_DIR_POSTFIX))
89            return -1;
90    } else {
91        if (create_pkg_path(oldpkgdir, PKG_SEC_DIR_PREFIX, oldpkgname, PKG_DIR_POSTFIX))
92            return -1;
93        if (create_pkg_path(newpkgdir, PKG_SEC_DIR_PREFIX, newpkgname, PKG_DIR_POSTFIX))
94            return -1;
95    }
96
97    if (rename(oldpkgdir, newpkgdir) < 0) {
98        LOGE("cannot rename dir '%s' to '%s': %s\n", oldpkgdir, newpkgdir, strerror(errno));
99        return -errno;
100    }
101    return 0;
102}
103
104int delete_user_data(const char *pkgname, int encrypted_fs_flag)
105{
106    char pkgdir[PKG_PATH_MAX];
107
108    if (encrypted_fs_flag == USE_UNENCRYPTED_FS) {
109        if (create_pkg_path(pkgdir, PKG_DIR_PREFIX, pkgname, PKG_DIR_POSTFIX))
110            return -1;
111    } else {
112        if (create_pkg_path(pkgdir, PKG_SEC_DIR_PREFIX, pkgname, PKG_DIR_POSTFIX))
113            return -1;
114    }
115
116        /* delete contents, excluding "lib", but not the directory itself */
117    return delete_dir_contents(pkgdir, 0, "lib");
118}
119
120int delete_cache(const char *pkgname, int encrypted_fs_flag)
121{
122    char cachedir[PKG_PATH_MAX];
123
124    if (encrypted_fs_flag == USE_UNENCRYPTED_FS) {
125        if (create_pkg_path(cachedir, CACHE_DIR_PREFIX, pkgname, CACHE_DIR_POSTFIX))
126            return -1;
127    } else {
128        if (create_pkg_path(cachedir, CACHE_SEC_DIR_PREFIX, pkgname, CACHE_DIR_POSTFIX))
129            return -1;
130    }
131
132        /* delete contents, not the directory, no exceptions */
133    return delete_dir_contents(cachedir, 0, 0);
134}
135
136/* TODO(oam): depending on use case (ecryptfs or dmcrypt)
137 * change implementation
138 */
139static int64_t disk_free()
140{
141    struct statfs sfs;
142    if (statfs(PKG_DIR_PREFIX, &sfs) == 0) {
143        return sfs.f_bavail * sfs.f_bsize;
144    } else {
145        LOGE("Couldn't statfs " PKG_DIR_PREFIX ": %s\n", strerror(errno));
146        return -1;
147    }
148}
149
150/* Try to ensure free_size bytes of storage are available.
151 * Returns 0 on success.
152 * This is rather simple-minded because doing a full LRU would
153 * be potentially memory-intensive, and without atime it would
154 * also require that apps constantly modify file metadata even
155 * when just reading from the cache, which is pretty awful.
156 */
157int free_cache(int64_t free_size)
158{
159    const char *name;
160    int dfd, subfd;
161    DIR *d;
162    struct dirent *de;
163    int64_t avail;
164
165    avail = disk_free();
166    if (avail < 0) return -1;
167
168    LOGI("free_cache(%" PRId64 ") avail %" PRId64 "\n", free_size, avail);
169    if (avail >= free_size) return 0;
170
171    /* First try encrypted dir */
172    d = opendir(PKG_SEC_DIR_PREFIX);
173    if (d == NULL) {
174        LOGE("cannot open %s: %s\n", PKG_SEC_DIR_PREFIX, strerror(errno));
175    } else {
176        dfd = dirfd(d);
177
178        while ((de = readdir(d))) {
179           if (de->d_type != DT_DIR) continue;
180           name = de->d_name;
181
182            /* always skip "." and ".." */
183            if (name[0] == '.') {
184                if (name[1] == 0) continue;
185                if ((name[1] == '.') && (name[2] == 0)) continue;
186            }
187
188            subfd = openat(dfd, name, O_RDONLY | O_DIRECTORY);
189            if (subfd < 0) continue;
190
191            delete_dir_contents_fd(subfd, "cache");
192            close(subfd);
193
194            avail = disk_free();
195            if (avail >= free_size) {
196                closedir(d);
197                return 0;
198            }
199        }
200        closedir(d);
201    }
202
203    /* Next try unencrypted dir... */
204    d = opendir(PKG_DIR_PREFIX);
205    if (d == NULL) {
206        LOGE("cannot open %s: %s\n", PKG_DIR_PREFIX, strerror(errno));
207        return -1;
208    }
209    dfd = dirfd(d);
210
211    while ((de = readdir(d))) {
212        if (de->d_type != DT_DIR) continue;
213        name = de->d_name;
214
215        /* always skip "." and ".." */
216        if (name[0] == '.') {
217            if (name[1] == 0) continue;
218            if ((name[1] == '.') && (name[2] == 0)) continue;
219        }
220
221        subfd = openat(dfd, name, O_RDONLY | O_DIRECTORY);
222        if (subfd < 0) continue;
223
224        delete_dir_contents_fd(subfd, "cache");
225        close(subfd);
226
227        avail = disk_free();
228        if (avail >= free_size) {
229            closedir(d);
230            return 0;
231        }
232    }
233    closedir(d);
234
235    /* Fail case - not possible to free space */
236    return -1;
237}
238
239/* used by move_dex, rm_dex, etc to ensure that the provided paths
240 * don't point anywhere other than at the APK_DIR_PREFIX
241 */
242static int is_valid_apk_path(const char *path)
243{
244    int len = strlen(APK_DIR_PREFIX);
245int nosubdircheck = 0;
246    if (strncmp(path, APK_DIR_PREFIX, len)) {
247        len = strlen(PROTECTED_DIR_PREFIX);
248        if (strncmp(path, PROTECTED_DIR_PREFIX, len)) {
249            len = strlen(SDCARD_DIR_PREFIX);
250            if (strncmp(path, SDCARD_DIR_PREFIX, len)) {
251                LOGE("invalid apk path '%s' (bad prefix)\n", path);
252                return 0;
253            } else {
254                nosubdircheck = 1;
255            }
256        }
257    }
258    if ((nosubdircheck != 1) && strchr(path + len, '/')) {
259        LOGE("invalid apk path '%s' (subdir?)\n", path);
260        return 0;
261    }
262    if (path[len] == '.') {
263        LOGE("invalid apk path '%s' (trickery)\n", path);
264        return 0;
265    }
266    return 1;
267}
268
269int move_dex(const char *src, const char *dst)
270{
271    char src_dex[PKG_PATH_MAX];
272    char dst_dex[PKG_PATH_MAX];
273
274    if (!is_valid_apk_path(src)) return -1;
275    if (!is_valid_apk_path(dst)) return -1;
276
277    if (create_cache_path(src_dex, src)) return -1;
278    if (create_cache_path(dst_dex, dst)) return -1;
279
280    LOGI("move %s -> %s\n", src_dex, dst_dex);
281    if (rename(src_dex, dst_dex) < 0) {
282        LOGE("Couldn't move %s: %s\n", src_dex, strerror(errno));
283        return -1;
284    } else {
285        return 0;
286    }
287}
288
289int rm_dex(const char *path)
290{
291    char dex_path[PKG_PATH_MAX];
292
293    if (!is_valid_apk_path(path)) return -1;
294    if (create_cache_path(dex_path, path)) return -1;
295
296    LOGI("unlink %s\n", dex_path);
297    if (unlink(dex_path) < 0) {
298        LOGE("Couldn't unlink %s: %s\n", dex_path, strerror(errno));
299        return -1;
300    } else {
301        return 0;
302    }
303}
304
305int protect(char *pkgname, gid_t gid)
306{
307    struct stat s;
308    char pkgpath[PKG_PATH_MAX];
309
310    if (gid < AID_SYSTEM) return -1;
311
312    if (create_pkg_path(pkgpath, PROTECTED_DIR_PREFIX, pkgname, ".apk"))
313        return -1;
314
315    if (stat(pkgpath, &s) < 0) return -1;
316
317    if (chown(pkgpath, s.st_uid, gid) < 0) {
318        LOGE("failed to chgrp '%s': %s\n", pkgpath, strerror(errno));
319        return -1;
320    }
321
322    if (chmod(pkgpath, S_IRUSR|S_IWUSR|S_IRGRP) < 0) {
323        LOGE("failed to chmod '%s': %s\n", pkgpath, strerror(errno));
324        return -1;
325    }
326
327    return 0;
328}
329
330static int64_t stat_size(struct stat *s)
331{
332    int64_t blksize = s->st_blksize;
333    int64_t size = s->st_size;
334
335    if (blksize) {
336            /* round up to filesystem block size */
337        size = (size + blksize - 1) & (~(blksize - 1));
338    }
339
340    return size;
341}
342
343static int64_t calculate_dir_size(int dfd)
344{
345    int64_t size = 0;
346    struct stat s;
347    DIR *d;
348    struct dirent *de;
349
350    d = fdopendir(dfd);
351    if (d == NULL) {
352        close(dfd);
353        return 0;
354    }
355
356    while ((de = readdir(d))) {
357        const char *name = de->d_name;
358        if (de->d_type == DT_DIR) {
359            int subfd;
360                /* always skip "." and ".." */
361            if (name[0] == '.') {
362                if (name[1] == 0) continue;
363                if ((name[1] == '.') && (name[2] == 0)) continue;
364            }
365            subfd = openat(dfd, name, O_RDONLY | O_DIRECTORY);
366            if (subfd >= 0) {
367                size += calculate_dir_size(subfd);
368            }
369        } else {
370            if (fstatat(dfd, name, &s, AT_SYMLINK_NOFOLLOW) == 0) {
371                size += stat_size(&s);
372            }
373        }
374    }
375    closedir(d);
376    return size;
377}
378
379int get_size(const char *pkgname, const char *apkpath,
380             const char *fwdlock_apkpath,
381             int64_t *_codesize, int64_t *_datasize, int64_t *_cachesize, int encrypted_fs_flag)
382{
383    DIR *d;
384    int dfd;
385    struct dirent *de;
386    struct stat s;
387    char path[PKG_PATH_MAX];
388
389    int64_t codesize = 0;
390    int64_t datasize = 0;
391    int64_t cachesize = 0;
392
393        /* count the source apk as code -- but only if it's not
394         * on the /system partition and its not on the sdcard.
395         */
396    if (strncmp(apkpath, "/system", 7) != 0 &&
397            strncmp(apkpath, SDCARD_DIR_PREFIX, 7) != 0) {
398        if (stat(apkpath, &s) == 0) {
399            codesize += stat_size(&s);
400        }
401    }
402        /* count the forward locked apk as code if it is given
403         */
404    if (fwdlock_apkpath != NULL && fwdlock_apkpath[0] != '!') {
405        if (stat(fwdlock_apkpath, &s) == 0) {
406            codesize += stat_size(&s);
407        }
408    }
409        /* count the cached dexfile as code */
410    if (!create_cache_path(path, apkpath)) {
411        if (stat(path, &s) == 0) {
412            codesize += stat_size(&s);
413        }
414    }
415
416    if (encrypted_fs_flag == 0) {
417        if (create_pkg_path(path, PKG_DIR_PREFIX, pkgname, PKG_DIR_POSTFIX)) {
418            goto done;
419        }
420    } else {
421        if (create_pkg_path(path, PKG_SEC_DIR_PREFIX, pkgname, PKG_DIR_POSTFIX)) {
422            goto done;
423        }
424    }
425
426    d = opendir(path);
427    if (d == NULL) {
428        goto done;
429    }
430    dfd = dirfd(d);
431
432        /* most stuff in the pkgdir is data, except for the "cache"
433         * directory and below, which is cache, and the "lib" directory
434         * and below, which is code...
435         */
436    while ((de = readdir(d))) {
437        const char *name = de->d_name;
438
439        if (de->d_type == DT_DIR) {
440            int subfd;
441                /* always skip "." and ".." */
442            if (name[0] == '.') {
443                if (name[1] == 0) continue;
444                if ((name[1] == '.') && (name[2] == 0)) continue;
445            }
446            subfd = openat(dfd, name, O_RDONLY | O_DIRECTORY);
447            if (subfd >= 0) {
448                int64_t size = calculate_dir_size(subfd);
449                if (!strcmp(name,"lib")) {
450                    codesize += size;
451                } else if(!strcmp(name,"cache")) {
452                    cachesize += size;
453                } else {
454                    datasize += size;
455                }
456            }
457        } else {
458            if (fstatat(dfd, name, &s, AT_SYMLINK_NOFOLLOW) == 0) {
459                datasize += stat_size(&s);
460            }
461        }
462    }
463    closedir(d);
464done:
465    *_codesize = codesize;
466    *_datasize = datasize;
467    *_cachesize = cachesize;
468    return 0;
469}
470
471
472/* a simpler version of dexOptGenerateCacheFileName() */
473int create_cache_path(char path[PKG_PATH_MAX], const char *src)
474{
475    char *tmp;
476    int srclen;
477    int dstlen;
478
479    srclen = strlen(src);
480
481        /* demand that we are an absolute path */
482    if ((src == 0) || (src[0] != '/') || strstr(src,"..")) {
483        return -1;
484    }
485
486    if (srclen > PKG_PATH_MAX) {        // XXX: PKG_NAME_MAX?
487        return -1;
488    }
489
490    dstlen = srclen + strlen(DALVIK_CACHE_PREFIX) +
491        strlen(DALVIK_CACHE_POSTFIX) + 1;
492
493    if (dstlen > PKG_PATH_MAX) {
494        return -1;
495    }
496
497    sprintf(path,"%s%s%s",
498            DALVIK_CACHE_PREFIX,
499            src + 1, /* skip the leading / */
500            DALVIK_CACHE_POSTFIX);
501
502    for(tmp = path + strlen(DALVIK_CACHE_PREFIX); *tmp; tmp++) {
503        if (*tmp == '/') {
504            *tmp = '@';
505        }
506    }
507
508    return 0;
509}
510
511static void run_dexopt(int zip_fd, int odex_fd, const char* input_file_name,
512    const char* dexopt_flags)
513{
514    static const char* DEX_OPT_BIN = "/system/bin/dexopt";
515    static const int MAX_INT_LEN = 12;      // '-'+10dig+'\0' -OR- 0x+8dig
516    char zip_num[MAX_INT_LEN];
517    char odex_num[MAX_INT_LEN];
518
519    sprintf(zip_num, "%d", zip_fd);
520    sprintf(odex_num, "%d", odex_fd);
521
522    execl(DEX_OPT_BIN, DEX_OPT_BIN, "--zip", zip_num, odex_num, input_file_name,
523        dexopt_flags, (char*) NULL);
524    LOGE("execl(%s) failed: %s\n", DEX_OPT_BIN, strerror(errno));
525}
526
527static int wait_dexopt(pid_t pid, const char* apk_path)
528{
529    int status;
530    pid_t got_pid;
531
532    /*
533     * Wait for the optimization process to finish.
534     */
535    while (1) {
536        got_pid = waitpid(pid, &status, 0);
537        if (got_pid == -1 && errno == EINTR) {
538            printf("waitpid interrupted, retrying\n");
539        } else {
540            break;
541        }
542    }
543    if (got_pid != pid) {
544        LOGW("waitpid failed: wanted %d, got %d: %s\n",
545            (int) pid, (int) got_pid, strerror(errno));
546        return 1;
547    }
548
549    if (WIFEXITED(status) && WEXITSTATUS(status) == 0) {
550        LOGD("DexInv: --- END '%s' (success) ---\n", apk_path);
551        return 0;
552    } else {
553        LOGW("DexInv: --- END '%s' --- status=0x%04x, process failed\n",
554            apk_path, status);
555        return status;      /* always nonzero */
556    }
557}
558
559int dexopt(const char *apk_path, uid_t uid, int is_public)
560{
561    struct utimbuf ut;
562    struct stat apk_stat, dex_stat;
563    char dex_path[PKG_PATH_MAX];
564    char dexopt_flags[PROPERTY_VALUE_MAX];
565    char *end;
566    int res, zip_fd=-1, odex_fd=-1;
567
568        /* Before anything else: is there a .odex file?  If so, we have
569         * pre-optimized the apk and there is nothing to do here.
570         */
571    if (strlen(apk_path) >= (PKG_PATH_MAX - 8)) {
572        return -1;
573    }
574
575    /* platform-specific flags affecting optimization and verification */
576    property_get("dalvik.vm.dexopt-flags", dexopt_flags, "");
577
578    strcpy(dex_path, apk_path);
579    end = strrchr(dex_path, '.');
580    if (end != NULL) {
581        strcpy(end, ".odex");
582        if (stat(dex_path, &dex_stat) == 0) {
583            return 0;
584        }
585    }
586
587    if (create_cache_path(dex_path, apk_path)) {
588        return -1;
589    }
590
591    memset(&apk_stat, 0, sizeof(apk_stat));
592    stat(apk_path, &apk_stat);
593
594    zip_fd = open(apk_path, O_RDONLY, 0);
595    if (zip_fd < 0) {
596        LOGE("dexopt cannot open '%s' for input\n", apk_path);
597        return -1;
598    }
599
600    unlink(dex_path);
601    odex_fd = open(dex_path, O_RDWR | O_CREAT | O_EXCL, 0644);
602    if (odex_fd < 0) {
603        LOGE("dexopt cannot open '%s' for output\n", dex_path);
604        goto fail;
605    }
606    if (fchown(odex_fd, AID_SYSTEM, uid) < 0) {
607        LOGE("dexopt cannot chown '%s'\n", dex_path);
608        goto fail;
609    }
610    if (fchmod(odex_fd,
611               S_IRUSR|S_IWUSR|S_IRGRP |
612               (is_public ? S_IROTH : 0)) < 0) {
613        LOGE("dexopt cannot chmod '%s'\n", dex_path);
614        goto fail;
615    }
616
617    LOGD("DexInv: --- BEGIN '%s' ---\n", apk_path);
618
619    pid_t pid;
620    pid = fork();
621    if (pid == 0) {
622        /* child -- drop privileges before continuing */
623        if (setgid(uid) != 0) {
624            LOGE("setgid(%d) failed during dexopt\n", uid);
625            exit(64);
626        }
627        if (setuid(uid) != 0) {
628            LOGE("setuid(%d) during dexopt\n", uid);
629            exit(65);
630        }
631        if (flock(odex_fd, LOCK_EX | LOCK_NB) != 0) {
632            LOGE("flock(%s) failed: %s\n", dex_path, strerror(errno));
633            exit(66);
634        }
635
636        run_dexopt(zip_fd, odex_fd, apk_path, dexopt_flags);
637        exit(67);   /* only get here on exec failure */
638    } else {
639        res = wait_dexopt(pid, apk_path);
640        if (res != 0) {
641            LOGE("dexopt failed on '%s' res = %d\n", dex_path, res);
642            goto fail;
643        }
644    }
645
646    ut.actime = apk_stat.st_atime;
647    ut.modtime = apk_stat.st_mtime;
648    utime(dex_path, &ut);
649
650    close(odex_fd);
651    close(zip_fd);
652    return 0;
653
654fail:
655    if (odex_fd >= 0) {
656        close(odex_fd);
657        unlink(dex_path);
658    }
659    if (zip_fd >= 0) {
660        close(zip_fd);
661    }
662    return -1;
663}
664
665int create_move_path(char path[PKG_PATH_MAX],
666    const char* prefix,
667    const char* pkgname,
668    const char* leaf)
669{
670    if ((strlen(prefix) + strlen(pkgname) + strlen(leaf) + 1) >= PKG_PATH_MAX) {
671        return -1;
672    }
673
674    sprintf(path, "%s%s/%s", prefix, pkgname, leaf);
675    return 0;
676}
677
678void mkinnerdirs(char* path, int basepos, mode_t mode, int uid, int gid,
679        struct stat* statbuf)
680{
681    while (path[basepos] != 0) {
682        if (path[basepos] == '/') {
683            path[basepos] = 0;
684            if (lstat(path, statbuf) < 0) {
685                LOGI("Making directory: %s\n", path);
686                if (mkdir(path, mode) == 0) {
687                    chown(path, uid, gid);
688                } else {
689                    LOGW("Unable to make directory %s: %s\n", path, strerror(errno));
690                }
691            }
692            path[basepos] = '/';
693            basepos++;
694        }
695        basepos++;
696    }
697}
698
699int movefileordir(char* srcpath, char* dstpath, int dstbasepos,
700        int dstuid, int dstgid, struct stat* statbuf)
701{
702    DIR *d;
703    struct dirent *de;
704    int res;
705
706    int srcend = strlen(srcpath);
707    int dstend = strlen(dstpath);
708
709    if (lstat(srcpath, statbuf) < 0) {
710        LOGW("Unable to stat %s: %s\n", srcpath, strerror(errno));
711        return 1;
712    }
713
714    if ((statbuf->st_mode&S_IFDIR) == 0) {
715        mkinnerdirs(dstpath, dstbasepos, S_IRWXU|S_IRWXG|S_IXOTH,
716                dstuid, dstgid, statbuf);
717        LOGI("Renaming %s to %s (uid %d)\n", srcpath, dstpath, dstuid);
718        if (rename(srcpath, dstpath) >= 0) {
719            if (chown(dstpath, dstuid, dstgid) < 0) {
720                LOGE("cannot chown %s: %s\n", dstpath, strerror(errno));
721                unlink(dstpath);
722                return 1;
723            }
724        } else {
725            LOGW("Unable to rename %s to %s: %s\n",
726                srcpath, dstpath, strerror(errno));
727            return 1;
728        }
729        return 0;
730    }
731
732    d = opendir(srcpath);
733    if (d == NULL) {
734        LOGW("Unable to opendir %s: %s\n", srcpath, strerror(errno));
735        return 1;
736    }
737
738    res = 0;
739
740    while ((de = readdir(d))) {
741        const char *name = de->d_name;
742            /* always skip "." and ".." */
743        if (name[0] == '.') {
744            if (name[1] == 0) continue;
745            if ((name[1] == '.') && (name[2] == 0)) continue;
746        }
747
748        if ((srcend+strlen(name)) >= (PKG_PATH_MAX-2)) {
749            LOGW("Source path too long; skipping: %s/%s\n", srcpath, name);
750            continue;
751        }
752
753        if ((dstend+strlen(name)) >= (PKG_PATH_MAX-2)) {
754            LOGW("Destination path too long; skipping: %s/%s\n", dstpath, name);
755            continue;
756        }
757
758        srcpath[srcend] = dstpath[dstend] = '/';
759        strcpy(srcpath+srcend+1, name);
760        strcpy(dstpath+dstend+1, name);
761
762        if (movefileordir(srcpath, dstpath, dstbasepos, dstuid, dstgid, statbuf) != 0) {
763            res = 1;
764        }
765
766        // Note: we will be leaving empty directories behind in srcpath,
767        // but that is okay, the package manager will be erasing all of the
768        // data associated with .apks that disappear.
769
770        srcpath[srcend] = dstpath[dstend] = 0;
771    }
772
773    closedir(d);
774    return res;
775}
776
777int movefiles()
778{
779    DIR *d;
780    int dfd, subfd;
781    struct dirent *de;
782    struct stat s;
783    char buf[PKG_PATH_MAX+1];
784    int bufp, bufe, bufi, readlen;
785
786    char srcpkg[PKG_NAME_MAX];
787    char dstpkg[PKG_NAME_MAX];
788    char srcpath[PKG_PATH_MAX];
789    char dstpath[PKG_PATH_MAX];
790    int dstuid=-1, dstgid=-1;
791    int hasspace;
792
793    d = opendir(UPDATE_COMMANDS_DIR_PREFIX);
794    if (d == NULL) {
795        goto done;
796    }
797    dfd = dirfd(d);
798
799        /* Iterate through all files in the directory, executing the
800         * file movements requested there-in.
801         */
802    while ((de = readdir(d))) {
803        const char *name = de->d_name;
804
805        if (de->d_type == DT_DIR) {
806            continue;
807        } else {
808            subfd = openat(dfd, name, O_RDONLY);
809            if (subfd < 0) {
810                LOGW("Unable to open update commands at %s%s\n",
811                        UPDATE_COMMANDS_DIR_PREFIX, name);
812                continue;
813            }
814
815            bufp = 0;
816            bufe = 0;
817            buf[PKG_PATH_MAX] = 0;
818            srcpkg[0] = dstpkg[0] = 0;
819            while (1) {
820                bufi = bufp;
821                while (bufi < bufe && buf[bufi] != '\n') {
822                    bufi++;
823                }
824                if (bufi < bufe) {
825                    buf[bufi] = 0;
826                    LOGV("Processing line: %s\n", buf+bufp);
827                    hasspace = 0;
828                    while (bufp < bufi && isspace(buf[bufp])) {
829                        hasspace = 1;
830                        bufp++;
831                    }
832                    if (buf[bufp] == '#' || bufp == bufi) {
833                        // skip comments and empty lines.
834                    } else if (hasspace) {
835                        if (dstpkg[0] == 0) {
836                            LOGW("Path before package line in %s%s: %s\n",
837                                    UPDATE_COMMANDS_DIR_PREFIX, name, buf+bufp);
838                        } else if (srcpkg[0] == 0) {
839                            // Skip -- source package no longer exists.
840                        } else {
841                            LOGV("Move file: %s (from %s to %s)\n", buf+bufp, srcpkg, dstpkg);
842                            if (!create_move_path(srcpath, PKG_DIR_PREFIX, srcpkg, buf+bufp) &&
843                                    !create_move_path(dstpath, PKG_DIR_PREFIX, dstpkg, buf+bufp)) {
844                                movefileordir(srcpath, dstpath,
845                                        strlen(dstpath)-strlen(buf+bufp),
846                                        dstuid, dstgid, &s);
847                            }
848                        }
849                    } else {
850                        char* div = strchr(buf+bufp, ':');
851                        if (div == NULL) {
852                            LOGW("Bad package spec in %s%s; no ':' sep: %s\n",
853                                    UPDATE_COMMANDS_DIR_PREFIX, name, buf+bufp);
854                        } else {
855                            *div = 0;
856                            div++;
857                            if (strlen(buf+bufp) < PKG_NAME_MAX) {
858                                strcpy(dstpkg, buf+bufp);
859                            } else {
860                                srcpkg[0] = dstpkg[0] = 0;
861                                LOGW("Package name too long in %s%s: %s\n",
862                                        UPDATE_COMMANDS_DIR_PREFIX, name, buf+bufp);
863                            }
864                            if (strlen(div) < PKG_NAME_MAX) {
865                                strcpy(srcpkg, div);
866                            } else {
867                                srcpkg[0] = dstpkg[0] = 0;
868                                LOGW("Package name too long in %s%s: %s\n",
869                                        UPDATE_COMMANDS_DIR_PREFIX, name, div);
870                            }
871                            if (srcpkg[0] != 0) {
872                                if (!create_pkg_path(srcpath, PKG_DIR_PREFIX, srcpkg,
873                                        PKG_DIR_POSTFIX)) {
874                                    if (lstat(srcpath, &s) < 0) {
875                                        // Package no longer exists -- skip.
876                                        srcpkg[0] = 0;
877                                    }
878                                } else {
879                                    srcpkg[0] = 0;
880                                    LOGW("Can't create path %s in %s%s\n",
881                                            div, UPDATE_COMMANDS_DIR_PREFIX, name);
882                                }
883                                if (srcpkg[0] != 0) {
884                                    if (!create_pkg_path(dstpath, PKG_DIR_PREFIX, dstpkg,
885                                            PKG_DIR_POSTFIX)) {
886                                        if (lstat(dstpath, &s) == 0) {
887                                            dstuid = s.st_uid;
888                                            dstgid = s.st_gid;
889                                        } else {
890                                            // Destination package doesn't
891                                            // exist...  due to original-package,
892                                            // this is normal, so don't be
893                                            // noisy about it.
894                                            srcpkg[0] = 0;
895                                        }
896                                    } else {
897                                        srcpkg[0] = 0;
898                                        LOGW("Can't create path %s in %s%s\n",
899                                                div, UPDATE_COMMANDS_DIR_PREFIX, name);
900                                    }
901                                }
902                                LOGV("Transfering from %s to %s: uid=%d\n",
903                                    srcpkg, dstpkg, dstuid);
904                            }
905                        }
906                    }
907                    bufp = bufi+1;
908                } else {
909                    if (bufp == 0) {
910                        if (bufp < bufe) {
911                            LOGW("Line too long in %s%s, skipping: %s\n",
912                                    UPDATE_COMMANDS_DIR_PREFIX, name, buf);
913                        }
914                    } else if (bufp < bufe) {
915                        memcpy(buf, buf+bufp, bufe-bufp);
916                        bufe -= bufp;
917                        bufp = 0;
918                    }
919                    readlen = read(subfd, buf+bufe, PKG_PATH_MAX-bufe);
920                    if (readlen < 0) {
921                        LOGW("Failure reading update commands in %s%s: %s\n",
922                                UPDATE_COMMANDS_DIR_PREFIX, name, strerror(errno));
923                        break;
924                    } else if (readlen == 0) {
925                        break;
926                    }
927                    bufe += readlen;
928                    buf[bufe] = 0;
929                    LOGV("Read buf: %s\n", buf);
930                }
931            }
932            close(subfd);
933        }
934    }
935    closedir(d);
936done:
937    return 0;
938}
939