commands.c revision ad757e9b36d6bc6b8e39be00612d0e60863aaafc 
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#include <diskusage/dirsize.h>
19
20/* Directory records that are used in execution of commands. */
21dir_rec_t android_data_dir;
22dir_rec_t android_asec_dir;
23dir_rec_t android_app_dir;
24dir_rec_t android_app_private_dir;
25dir_rec_array_t android_system_dirs;
26
27int install(const char *pkgname, uid_t uid, gid_t gid)
28{
29    char pkgdir[PKG_PATH_MAX];
30    char libdir[PKG_PATH_MAX];
31
32    if ((uid < AID_SYSTEM) || (gid < AID_SYSTEM)) {
33        LOGE("invalid uid/gid: %d %d\n", uid, gid);
34        return -1;
35    }
36
37    if (create_pkg_path(pkgdir, pkgname, PKG_DIR_POSTFIX, 0)) {
38        LOGE("cannot create package path\n");
39        return -1;
40    }
41
42    if (create_pkg_path(libdir, pkgname, PKG_LIB_POSTFIX, 0)) {
43        LOGE("cannot create package lib path\n");
44        return -1;
45    }
46
47    if (mkdir(pkgdir, 0751) < 0) {
48        LOGE("cannot create dir '%s': %s\n", pkgdir, strerror(errno));
49        return -errno;
50    }
51    if (chmod(pkgdir, 0751) < 0) {
52        LOGE("cannot chmod dir '%s': %s\n", pkgdir, strerror(errno));
53        unlink(pkgdir);
54        return -errno;
55    }
56    if (chown(pkgdir, uid, gid) < 0) {
57        LOGE("cannot chown dir '%s': %s\n", pkgdir, strerror(errno));
58        unlink(pkgdir);
59        return -errno;
60    }
61    if (mkdir(libdir, 0755) < 0) {
62        LOGE("cannot create dir '%s': %s\n", libdir, strerror(errno));
63        unlink(pkgdir);
64        return -errno;
65    }
66    if (chmod(libdir, 0755) < 0) {
67        LOGE("cannot chmod dir '%s': %s\n", libdir, strerror(errno));
68        unlink(libdir);
69        unlink(pkgdir);
70        return -errno;
71    }
72    if (chown(libdir, AID_SYSTEM, AID_SYSTEM) < 0) {
73        LOGE("cannot chown dir '%s': %s\n", libdir, strerror(errno));
74        unlink(libdir);
75        unlink(pkgdir);
76        return -errno;
77    }
78    return 0;
79}
80
81int uninstall(const char *pkgname, uid_t persona)
82{
83    char pkgdir[PKG_PATH_MAX];
84
85    if (create_pkg_path(pkgdir, pkgname, PKG_DIR_POSTFIX, persona))
86        return -1;
87
88    /* delete contents AND directory, no exceptions */
89    return delete_dir_contents(pkgdir, 1, NULL);
90}
91
92int renamepkg(const char *oldpkgname, const char *newpkgname)
93{
94    char oldpkgdir[PKG_PATH_MAX];
95    char newpkgdir[PKG_PATH_MAX];
96
97    if (create_pkg_path(oldpkgdir, oldpkgname, PKG_DIR_POSTFIX, 0))
98        return -1;
99    if (create_pkg_path(newpkgdir, newpkgname, PKG_DIR_POSTFIX, 0))
100        return -1;
101
102    if (rename(oldpkgdir, newpkgdir) < 0) {
103        LOGE("cannot rename dir '%s' to '%s': %s\n", oldpkgdir, newpkgdir, strerror(errno));
104        return -errno;
105    }
106    return 0;
107}
108
109int delete_user_data(const char *pkgname, uid_t persona)
110{
111    char pkgdir[PKG_PATH_MAX];
112
113    if (create_pkg_path(pkgdir, pkgname, PKG_DIR_POSTFIX, persona))
114        return -1;
115
116    /* delete contents, excluding "lib", but not the directory itself */
117    return delete_dir_contents(pkgdir, 0, "lib");
118}
119
120int make_user_data(const char *pkgname, uid_t uid, uid_t persona)
121{
122    char pkgdir[PKG_PATH_MAX];
123    char real_libdir[PKG_PATH_MAX];
124
125    // Create the data dir for the package
126    if (create_pkg_path(pkgdir, pkgname, PKG_DIR_POSTFIX, persona)) {
127        return -1;
128    }
129    if (mkdir(pkgdir, 0751) < 0) {
130        LOGE("cannot create dir '%s': %s\n", pkgdir, strerror(errno));
131        return -errno;
132    }
133    if (chown(pkgdir, uid, uid) < 0) {
134        LOGE("cannot chown dir '%s': %s\n", pkgdir, strerror(errno));
135        unlink(pkgdir);
136        return -errno;
137    }
138    return 0;
139}
140
141int delete_persona(uid_t persona)
142{
143    char pkgdir[PKG_PATH_MAX];
144
145    if (create_persona_path(pkgdir, persona))
146        return -1;
147
148    return delete_dir_contents(pkgdir, 1, NULL);
149}
150
151int delete_cache(const char *pkgname)
152{
153    char cachedir[PKG_PATH_MAX];
154
155    if (create_pkg_path(cachedir, pkgname, CACHE_DIR_POSTFIX, 0))
156        return -1;
157
158        /* delete contents, not the directory, no exceptions */
159    return delete_dir_contents(cachedir, 0, 0);
160}
161
162static int64_t disk_free()
163{
164    struct statfs sfs;
165    if (statfs(android_data_dir.path, &sfs) == 0) {
166        return sfs.f_bavail * sfs.f_bsize;
167    } else {
168        LOGE("Couldn't statfs %s: %s\n", android_data_dir.path, strerror(errno));
169        return -1;
170    }
171}
172
173/* Try to ensure free_size bytes of storage are available.
174 * Returns 0 on success.
175 * This is rather simple-minded because doing a full LRU would
176 * be potentially memory-intensive, and without atime it would
177 * also require that apps constantly modify file metadata even
178 * when just reading from the cache, which is pretty awful.
179 */
180int free_cache(int64_t free_size)
181{
182    const char *name;
183    int dfd, subfd;
184    DIR *d;
185    struct dirent *de;
186    int64_t avail;
187    char datadir[PKG_PATH_MAX];
188
189    avail = disk_free();
190    if (avail < 0) return -1;
191
192    LOGI("free_cache(%" PRId64 ") avail %" PRId64 "\n", free_size, avail);
193    if (avail >= free_size) return 0;
194
195    if (create_persona_path(datadir, 0)) {
196        LOGE("couldn't get directory for persona 0");
197        return -1;
198    }
199
200    d = opendir(datadir);
201    if (d == NULL) {
202        LOGE("cannot open %s: %s\n", datadir, strerror(errno));
203        return -1;
204    }
205    dfd = dirfd(d);
206
207    while ((de = readdir(d))) {
208        if (de->d_type != DT_DIR) continue;
209        name = de->d_name;
210
211        /* always skip "." and ".." */
212        if (name[0] == '.') {
213            if (name[1] == 0) continue;
214            if ((name[1] == '.') && (name[2] == 0)) continue;
215        }
216
217        subfd = openat(dfd, name, O_RDONLY | O_DIRECTORY);
218        if (subfd < 0) continue;
219
220        delete_dir_contents_fd(subfd, "cache");
221        close(subfd);
222
223        avail = disk_free();
224        if (avail >= free_size) {
225            closedir(d);
226            return 0;
227        }
228    }
229    closedir(d);
230
231    /* Fail case - not possible to free space */
232    return -1;
233}
234
235int move_dex(const char *src, const char *dst)
236{
237    char src_dex[PKG_PATH_MAX];
238    char dst_dex[PKG_PATH_MAX];
239
240    if (validate_apk_path(src)) return -1;
241    if (validate_apk_path(dst)) return -1;
242
243    if (create_cache_path(src_dex, src)) return -1;
244    if (create_cache_path(dst_dex, dst)) return -1;
245
246    LOGV("move %s -> %s\n", src_dex, dst_dex);
247    if (rename(src_dex, dst_dex) < 0) {
248        LOGE("Couldn't move %s: %s\n", src_dex, strerror(errno));
249        return -1;
250    } else {
251        return 0;
252    }
253}
254
255int rm_dex(const char *path)
256{
257    char dex_path[PKG_PATH_MAX];
258
259    if (validate_apk_path(path)) return -1;
260    if (create_cache_path(dex_path, path)) return -1;
261
262    LOGV("unlink %s\n", dex_path);
263    if (unlink(dex_path) < 0) {
264        LOGE("Couldn't unlink %s: %s\n", dex_path, strerror(errno));
265        return -1;
266    } else {
267        return 0;
268    }
269}
270
271int protect(char *pkgname, gid_t gid)
272{
273    struct stat s;
274    char pkgpath[PKG_PATH_MAX];
275
276    if (gid < AID_SYSTEM) return -1;
277
278    if (create_pkg_path_in_dir(pkgpath, &android_app_private_dir, pkgname, ".apk"))
279        return -1;
280
281    if (stat(pkgpath, &s) < 0) return -1;
282
283    if (chown(pkgpath, s.st_uid, gid) < 0) {
284        LOGE("failed to chgrp '%s': %s\n", pkgpath, strerror(errno));
285        return -1;
286    }
287
288    if (chmod(pkgpath, S_IRUSR|S_IWUSR|S_IRGRP) < 0) {
289        LOGE("failed to chmod '%s': %s\n", pkgpath, strerror(errno));
290        return -1;
291    }
292
293    return 0;
294}
295
296int get_size(const char *pkgname, const char *apkpath,
297             const char *fwdlock_apkpath, const char *asecpath,
298             int64_t *_codesize, int64_t *_datasize, int64_t *_cachesize,
299             int64_t* _asecsize)
300{
301    DIR *d;
302    int dfd;
303    struct dirent *de;
304    struct stat s;
305    char path[PKG_PATH_MAX];
306
307    int64_t codesize = 0;
308    int64_t datasize = 0;
309    int64_t cachesize = 0;
310    int64_t asecsize = 0;
311
312        /* count the source apk as code -- but only if it's not
313         * on the /system partition and its not on the sdcard.
314         */
315    if (validate_system_app_path(apkpath) &&
316            strncmp(apkpath, android_asec_dir.path, android_asec_dir.len) != 0) {
317        if (stat(apkpath, &s) == 0) {
318            codesize += stat_size(&s);
319        }
320    }
321        /* count the forward locked apk as code if it is given
322         */
323    if (fwdlock_apkpath != NULL && fwdlock_apkpath[0] != '!') {
324        if (stat(fwdlock_apkpath, &s) == 0) {
325            codesize += stat_size(&s);
326        }
327    }
328        /* count the cached dexfile as code */
329    if (!create_cache_path(path, apkpath)) {
330        if (stat(path, &s) == 0) {
331            codesize += stat_size(&s);
332        }
333    }
334
335        /* compute asec size if it is given
336         */
337    if (asecpath != NULL && asecpath[0] != '!') {
338        if (stat(asecpath, &s) == 0) {
339            asecsize += stat_size(&s);
340        }
341    }
342
343    if (create_pkg_path(path, pkgname, PKG_DIR_POSTFIX, 0)) {
344        goto done;
345    }
346
347    d = opendir(path);
348    if (d == NULL) {
349        goto done;
350    }
351    dfd = dirfd(d);
352
353    /* most stuff in the pkgdir is data, except for the "cache"
354     * directory and below, which is cache, and the "lib" directory
355     * and below, which is code...
356     */
357    while ((de = readdir(d))) {
358        const char *name = de->d_name;
359
360        if (de->d_type == DT_DIR) {
361            int subfd;
362                /* always skip "." and ".." */
363            if (name[0] == '.') {
364                if (name[1] == 0) continue;
365                if ((name[1] == '.') && (name[2] == 0)) continue;
366            }
367            subfd = openat(dfd, name, O_RDONLY | O_DIRECTORY);
368            if (subfd >= 0) {
369                int64_t size = calculate_dir_size(subfd);
370                if (!strcmp(name,"lib")) {
371                    codesize += size;
372                } else if(!strcmp(name,"cache")) {
373                    cachesize += size;
374                } else {
375                    datasize += size;
376                }
377            }
378        } else {
379            if (fstatat(dfd, name, &s, AT_SYMLINK_NOFOLLOW) == 0) {
380                datasize += stat_size(&s);
381            }
382        }
383    }
384    closedir(d);
385done:
386    *_codesize = codesize;
387    *_datasize = datasize;
388    *_cachesize = cachesize;
389    *_asecsize = asecsize;
390    return 0;
391}
392
393
394/* a simpler version of dexOptGenerateCacheFileName() */
395int create_cache_path(char path[PKG_PATH_MAX], const char *src)
396{
397    char *tmp;
398    int srclen;
399    int dstlen;
400
401    srclen = strlen(src);
402
403        /* demand that we are an absolute path */
404    if ((src == 0) || (src[0] != '/') || strstr(src,"..")) {
405        return -1;
406    }
407
408    if (srclen > PKG_PATH_MAX) {        // XXX: PKG_NAME_MAX?
409        return -1;
410    }
411
412    dstlen = srclen + strlen(DALVIK_CACHE_PREFIX) +
413        strlen(DALVIK_CACHE_POSTFIX) + 1;
414
415    if (dstlen > PKG_PATH_MAX) {
416        return -1;
417    }
418
419    sprintf(path,"%s%s%s",
420            DALVIK_CACHE_PREFIX,
421            src + 1, /* skip the leading / */
422            DALVIK_CACHE_POSTFIX);
423
424    for(tmp = path + strlen(DALVIK_CACHE_PREFIX); *tmp; tmp++) {
425        if (*tmp == '/') {
426            *tmp = '@';
427        }
428    }
429
430    return 0;
431}
432
433static void run_dexopt(int zip_fd, int odex_fd, const char* input_file_name,
434    const char* dexopt_flags)
435{
436    static const char* DEX_OPT_BIN = "/system/bin/dexopt";
437    static const int MAX_INT_LEN = 12;      // '-'+10dig+'\0' -OR- 0x+8dig
438    char zip_num[MAX_INT_LEN];
439    char odex_num[MAX_INT_LEN];
440
441    sprintf(zip_num, "%d", zip_fd);
442    sprintf(odex_num, "%d", odex_fd);
443
444    execl(DEX_OPT_BIN, DEX_OPT_BIN, "--zip", zip_num, odex_num, input_file_name,
445        dexopt_flags, (char*) NULL);
446    LOGE("execl(%s) failed: %s\n", DEX_OPT_BIN, strerror(errno));
447}
448
449static int wait_dexopt(pid_t pid, const char* apk_path)
450{
451    int status;
452    pid_t got_pid;
453
454    /*
455     * Wait for the optimization process to finish.
456     */
457    while (1) {
458        got_pid = waitpid(pid, &status, 0);
459        if (got_pid == -1 && errno == EINTR) {
460            printf("waitpid interrupted, retrying\n");
461        } else {
462            break;
463        }
464    }
465    if (got_pid != pid) {
466        LOGW("waitpid failed: wanted %d, got %d: %s\n",
467            (int) pid, (int) got_pid, strerror(errno));
468        return 1;
469    }
470
471    if (WIFEXITED(status) && WEXITSTATUS(status) == 0) {
472        LOGV("DexInv: --- END '%s' (success) ---\n", apk_path);
473        return 0;
474    } else {
475        LOGW("DexInv: --- END '%s' --- status=0x%04x, process failed\n",
476            apk_path, status);
477        return status;      /* always nonzero */
478    }
479}
480
481int dexopt(const char *apk_path, uid_t uid, int is_public)
482{
483    struct utimbuf ut;
484    struct stat apk_stat, dex_stat;
485    char dex_path[PKG_PATH_MAX];
486    char dexopt_flags[PROPERTY_VALUE_MAX];
487    char *end;
488    int res, zip_fd=-1, odex_fd=-1;
489
490        /* Before anything else: is there a .odex file?  If so, we have
491         * pre-optimized the apk and there is nothing to do here.
492         */
493    if (strlen(apk_path) >= (PKG_PATH_MAX - 8)) {
494        return -1;
495    }
496
497    /* platform-specific flags affecting optimization and verification */
498    property_get("dalvik.vm.dexopt-flags", dexopt_flags, "");
499
500    strcpy(dex_path, apk_path);
501    end = strrchr(dex_path, '.');
502    if (end != NULL) {
503        strcpy(end, ".odex");
504        if (stat(dex_path, &dex_stat) == 0) {
505            return 0;
506        }
507    }
508
509    if (create_cache_path(dex_path, apk_path)) {
510        return -1;
511    }
512
513    memset(&apk_stat, 0, sizeof(apk_stat));
514    stat(apk_path, &apk_stat);
515
516    zip_fd = open(apk_path, O_RDONLY, 0);
517    if (zip_fd < 0) {
518        LOGE("dexopt cannot open '%s' for input\n", apk_path);
519        return -1;
520    }
521
522    unlink(dex_path);
523    odex_fd = open(dex_path, O_RDWR | O_CREAT | O_EXCL, 0644);
524    if (odex_fd < 0) {
525        LOGE("dexopt cannot open '%s' for output\n", dex_path);
526        goto fail;
527    }
528    if (fchown(odex_fd, AID_SYSTEM, uid) < 0) {
529        LOGE("dexopt cannot chown '%s'\n", dex_path);
530        goto fail;
531    }
532    if (fchmod(odex_fd,
533               S_IRUSR|S_IWUSR|S_IRGRP |
534               (is_public ? S_IROTH : 0)) < 0) {
535        LOGE("dexopt cannot chmod '%s'\n", dex_path);
536        goto fail;
537    }
538
539    LOGV("DexInv: --- BEGIN '%s' ---\n", apk_path);
540
541    pid_t pid;
542    pid = fork();
543    if (pid == 0) {
544        /* child -- drop privileges before continuing */
545        if (setgid(uid) != 0) {
546            LOGE("setgid(%d) failed during dexopt\n", uid);
547            exit(64);
548        }
549        if (setuid(uid) != 0) {
550            LOGE("setuid(%d) during dexopt\n", uid);
551            exit(65);
552        }
553        if (flock(odex_fd, LOCK_EX | LOCK_NB) != 0) {
554            LOGE("flock(%s) failed: %s\n", dex_path, strerror(errno));
555            exit(66);
556        }
557
558        run_dexopt(zip_fd, odex_fd, apk_path, dexopt_flags);
559        exit(67);   /* only get here on exec failure */
560    } else {
561        res = wait_dexopt(pid, apk_path);
562        if (res != 0) {
563            LOGE("dexopt failed on '%s' res = %d\n", dex_path, res);
564            goto fail;
565        }
566    }
567
568    ut.actime = apk_stat.st_atime;
569    ut.modtime = apk_stat.st_mtime;
570    utime(dex_path, &ut);
571
572    close(odex_fd);
573    close(zip_fd);
574    return 0;
575
576fail:
577    if (odex_fd >= 0) {
578        close(odex_fd);
579        unlink(dex_path);
580    }
581    if (zip_fd >= 0) {
582        close(zip_fd);
583    }
584    return -1;
585}
586
587void mkinnerdirs(char* path, int basepos, mode_t mode, int uid, int gid,
588        struct stat* statbuf)
589{
590    while (path[basepos] != 0) {
591        if (path[basepos] == '/') {
592            path[basepos] = 0;
593            if (lstat(path, statbuf) < 0) {
594                LOGV("Making directory: %s\n", path);
595                if (mkdir(path, mode) == 0) {
596                    chown(path, uid, gid);
597                } else {
598                    LOGW("Unable to make directory %s: %s\n", path, strerror(errno));
599                }
600            }
601            path[basepos] = '/';
602            basepos++;
603        }
604        basepos++;
605    }
606}
607
608int movefileordir(char* srcpath, char* dstpath, int dstbasepos,
609        int dstuid, int dstgid, struct stat* statbuf)
610{
611    DIR *d;
612    struct dirent *de;
613    int res;
614
615    int srcend = strlen(srcpath);
616    int dstend = strlen(dstpath);
617
618    if (lstat(srcpath, statbuf) < 0) {
619        LOGW("Unable to stat %s: %s\n", srcpath, strerror(errno));
620        return 1;
621    }
622
623    if ((statbuf->st_mode&S_IFDIR) == 0) {
624        mkinnerdirs(dstpath, dstbasepos, S_IRWXU|S_IRWXG|S_IXOTH,
625                dstuid, dstgid, statbuf);
626        LOGV("Renaming %s to %s (uid %d)\n", srcpath, dstpath, dstuid);
627        if (rename(srcpath, dstpath) >= 0) {
628            if (chown(dstpath, dstuid, dstgid) < 0) {
629                LOGE("cannot chown %s: %s\n", dstpath, strerror(errno));
630                unlink(dstpath);
631                return 1;
632            }
633        } else {
634            LOGW("Unable to rename %s to %s: %s\n",
635                srcpath, dstpath, strerror(errno));
636            return 1;
637        }
638        return 0;
639    }
640
641    d = opendir(srcpath);
642    if (d == NULL) {
643        LOGW("Unable to opendir %s: %s\n", srcpath, strerror(errno));
644        return 1;
645    }
646
647    res = 0;
648
649    while ((de = readdir(d))) {
650        const char *name = de->d_name;
651            /* always skip "." and ".." */
652        if (name[0] == '.') {
653            if (name[1] == 0) continue;
654            if ((name[1] == '.') && (name[2] == 0)) continue;
655        }
656
657        if ((srcend+strlen(name)) >= (PKG_PATH_MAX-2)) {
658            LOGW("Source path too long; skipping: %s/%s\n", srcpath, name);
659            continue;
660        }
661
662        if ((dstend+strlen(name)) >= (PKG_PATH_MAX-2)) {
663            LOGW("Destination path too long; skipping: %s/%s\n", dstpath, name);
664            continue;
665        }
666
667        srcpath[srcend] = dstpath[dstend] = '/';
668        strcpy(srcpath+srcend+1, name);
669        strcpy(dstpath+dstend+1, name);
670
671        if (movefileordir(srcpath, dstpath, dstbasepos, dstuid, dstgid, statbuf) != 0) {
672            res = 1;
673        }
674
675        // Note: we will be leaving empty directories behind in srcpath,
676        // but that is okay, the package manager will be erasing all of the
677        // data associated with .apks that disappear.
678
679        srcpath[srcend] = dstpath[dstend] = 0;
680    }
681
682    closedir(d);
683    return res;
684}
685
686int movefiles()
687{
688    DIR *d;
689    int dfd, subfd;
690    struct dirent *de;
691    struct stat s;
692    char buf[PKG_PATH_MAX+1];
693    int bufp, bufe, bufi, readlen;
694
695    char srcpkg[PKG_NAME_MAX];
696    char dstpkg[PKG_NAME_MAX];
697    char srcpath[PKG_PATH_MAX];
698    char dstpath[PKG_PATH_MAX];
699    int dstuid=-1, dstgid=-1;
700    int hasspace;
701
702    d = opendir(UPDATE_COMMANDS_DIR_PREFIX);
703    if (d == NULL) {
704        goto done;
705    }
706    dfd = dirfd(d);
707
708        /* Iterate through all files in the directory, executing the
709         * file movements requested there-in.
710         */
711    while ((de = readdir(d))) {
712        const char *name = de->d_name;
713
714        if (de->d_type == DT_DIR) {
715            continue;
716        } else {
717            subfd = openat(dfd, name, O_RDONLY);
718            if (subfd < 0) {
719                LOGW("Unable to open update commands at %s%s\n",
720                        UPDATE_COMMANDS_DIR_PREFIX, name);
721                continue;
722            }
723
724            bufp = 0;
725            bufe = 0;
726            buf[PKG_PATH_MAX] = 0;
727            srcpkg[0] = dstpkg[0] = 0;
728            while (1) {
729                bufi = bufp;
730                while (bufi < bufe && buf[bufi] != '\n') {
731                    bufi++;
732                }
733                if (bufi < bufe) {
734                    buf[bufi] = 0;
735                    LOGV("Processing line: %s\n", buf+bufp);
736                    hasspace = 0;
737                    while (bufp < bufi && isspace(buf[bufp])) {
738                        hasspace = 1;
739                        bufp++;
740                    }
741                    if (buf[bufp] == '#' || bufp == bufi) {
742                        // skip comments and empty lines.
743                    } else if (hasspace) {
744                        if (dstpkg[0] == 0) {
745                            LOGW("Path before package line in %s%s: %s\n",
746                                    UPDATE_COMMANDS_DIR_PREFIX, name, buf+bufp);
747                        } else if (srcpkg[0] == 0) {
748                            // Skip -- source package no longer exists.
749                        } else {
750                            LOGV("Move file: %s (from %s to %s)\n", buf+bufp, srcpkg, dstpkg);
751                            if (!create_move_path(srcpath, srcpkg, buf+bufp, 0) &&
752                                    !create_move_path(dstpath, dstpkg, buf+bufp, 0)) {
753                                movefileordir(srcpath, dstpath,
754                                        strlen(dstpath)-strlen(buf+bufp),
755                                        dstuid, dstgid, &s);
756                            }
757                        }
758                    } else {
759                        char* div = strchr(buf+bufp, ':');
760                        if (div == NULL) {
761                            LOGW("Bad package spec in %s%s; no ':' sep: %s\n",
762                                    UPDATE_COMMANDS_DIR_PREFIX, name, buf+bufp);
763                        } else {
764                            *div = 0;
765                            div++;
766                            if (strlen(buf+bufp) < PKG_NAME_MAX) {
767                                strcpy(dstpkg, buf+bufp);
768                            } else {
769                                srcpkg[0] = dstpkg[0] = 0;
770                                LOGW("Package name too long in %s%s: %s\n",
771                                        UPDATE_COMMANDS_DIR_PREFIX, name, buf+bufp);
772                            }
773                            if (strlen(div) < PKG_NAME_MAX) {
774                                strcpy(srcpkg, div);
775                            } else {
776                                srcpkg[0] = dstpkg[0] = 0;
777                                LOGW("Package name too long in %s%s: %s\n",
778                                        UPDATE_COMMANDS_DIR_PREFIX, name, div);
779                            }
780                            if (srcpkg[0] != 0) {
781                                if (!create_pkg_path(srcpath, srcpkg, PKG_DIR_POSTFIX, 0)) {
782                                    if (lstat(srcpath, &s) < 0) {
783                                        // Package no longer exists -- skip.
784                                        srcpkg[0] = 0;
785                                    }
786                                } else {
787                                    srcpkg[0] = 0;
788                                    LOGW("Can't create path %s in %s%s\n",
789                                            div, UPDATE_COMMANDS_DIR_PREFIX, name);
790                                }
791                                if (srcpkg[0] != 0) {
792                                    if (!create_pkg_path(dstpath, dstpkg, PKG_DIR_POSTFIX, 0)) {
793                                        if (lstat(dstpath, &s) == 0) {
794                                            dstuid = s.st_uid;
795                                            dstgid = s.st_gid;
796                                        } else {
797                                            // Destination package doesn't
798                                            // exist...  due to original-package,
799                                            // this is normal, so don't be
800                                            // noisy about it.
801                                            srcpkg[0] = 0;
802                                        }
803                                    } else {
804                                        srcpkg[0] = 0;
805                                        LOGW("Can't create path %s in %s%s\n",
806                                                div, UPDATE_COMMANDS_DIR_PREFIX, name);
807                                    }
808                                }
809                                LOGV("Transfering from %s to %s: uid=%d\n",
810                                    srcpkg, dstpkg, dstuid);
811                            }
812                        }
813                    }
814                    bufp = bufi+1;
815                } else {
816                    if (bufp == 0) {
817                        if (bufp < bufe) {
818                            LOGW("Line too long in %s%s, skipping: %s\n",
819                                    UPDATE_COMMANDS_DIR_PREFIX, name, buf);
820                        }
821                    } else if (bufp < bufe) {
822                        memcpy(buf, buf+bufp, bufe-bufp);
823                        bufe -= bufp;
824                        bufp = 0;
825                    }
826                    readlen = read(subfd, buf+bufe, PKG_PATH_MAX-bufe);
827                    if (readlen < 0) {
828                        LOGW("Failure reading update commands in %s%s: %s\n",
829                                UPDATE_COMMANDS_DIR_PREFIX, name, strerror(errno));
830                        break;
831                    } else if (readlen == 0) {
832                        break;
833                    }
834                    bufe += readlen;
835                    buf[bufe] = 0;
836                    LOGV("Read buf: %s\n", buf);
837                }
838            }
839            close(subfd);
840        }
841    }
842    closedir(d);
843done:
844    return 0;
845}
846
847int linklib(const char* dataDir, const char* asecLibDir)
848{
849    char libdir[PKG_PATH_MAX];
850    struct stat s, libStat;
851    int rc = 0;
852
853    const size_t libdirLen = strlen(dataDir) + strlen(PKG_LIB_POSTFIX);
854    if (libdirLen >= PKG_PATH_MAX) {
855        LOGE("library dir len too large");
856        return -1;
857    }
858
859    if (snprintf(libdir, sizeof(libdir), "%s%s", dataDir, PKG_LIB_POSTFIX) != (ssize_t)libdirLen) {
860        LOGE("library dir not written successfully: %s\n", strerror(errno));
861        return -1;
862    }
863
864    if (stat(dataDir, &s) < 0) return -1;
865
866    if (chown(dataDir, 0, 0) < 0) {
867        LOGE("failed to chown '%s': %s\n", dataDir, strerror(errno));
868        return -1;
869    }
870
871    if (chmod(dataDir, 0700) < 0) {
872        LOGE("failed to chmod '%s': %s\n", dataDir, strerror(errno));
873        rc = -1;
874        goto out;
875    }
876
877    if (lstat(libdir, &libStat) < 0) {
878        LOGE("couldn't stat lib dir: %s\n", strerror(errno));
879        rc = -1;
880        goto out;
881    }
882
883    if (S_ISDIR(libStat.st_mode)) {
884        if (delete_dir_contents(libdir, 1, 0) < 0) {
885            rc = -1;
886            goto out;
887        }
888    } else if (S_ISLNK(libStat.st_mode)) {
889        if (unlink(libdir) < 0) {
890            rc = -1;
891            goto out;
892        }
893    }
894
895    if (symlink(asecLibDir, libdir) < 0) {
896        LOGE("couldn't symlink directory '%s' -> '%s': %s\n", libdir, asecLibDir, strerror(errno));
897        rc = -errno;
898        goto out;
899    }
900
901    if (lchown(libdir, AID_SYSTEM, AID_SYSTEM) < 0) {
902        LOGE("cannot chown dir '%s': %s\n", libdir, strerror(errno));
903        unlink(libdir);
904        rc = -errno;
905        goto out;
906    }
907
908out:
909    if (chmod(dataDir, s.st_mode) < 0) {
910        LOGE("failed to chmod '%s': %s\n", dataDir, strerror(errno));
911        return -errno;
912    }
913
914    if (chown(dataDir, s.st_uid, s.st_gid) < 0) {
915        LOGE("failed to chown '%s' : %s\n", dataDir, strerror(errno));
916        return -errno;
917    }
918
919    return rc;
920}
921
922int unlinklib(const char* dataDir)
923{
924    char libdir[PKG_PATH_MAX];
925    struct stat s, libStat;
926    int rc = 0;
927
928    const size_t libdirLen = strlen(dataDir) + strlen(PKG_LIB_POSTFIX);
929    if (libdirLen >= PKG_PATH_MAX) {
930        return -1;
931    }
932
933    if (snprintf(libdir, sizeof(libdir), "%s%s", dataDir, PKG_LIB_POSTFIX) != (ssize_t)libdirLen) {
934        LOGE("library dir not written successfully: %s\n", strerror(errno));
935        return -1;
936    }
937
938    if (stat(dataDir, &s) < 0) {
939        LOGE("couldn't state data dir");
940        return -1;
941    }
942
943    if (chown(dataDir, 0, 0) < 0) {
944        LOGE("failed to chown '%s': %s\n", dataDir, strerror(errno));
945        return -1;
946    }
947
948    if (chmod(dataDir, 0700) < 0) {
949        LOGE("failed to chmod '%s': %s\n", dataDir, strerror(errno));
950        rc = -1;
951        goto out;
952    }
953
954    if (lstat(libdir, &libStat) < 0) {
955        LOGE("couldn't stat lib dir: %s\n", strerror(errno));
956        rc = -1;
957        goto out;
958    }
959
960    if (S_ISDIR(libStat.st_mode)) {
961        if (delete_dir_contents(libdir, 1, 0) < 0) {
962            rc = -1;
963            goto out;
964        }
965    } else if (S_ISLNK(libStat.st_mode)) {
966        if (unlink(libdir) < 0) {
967            rc = -1;
968            goto out;
969        }
970    }
971
972    if (mkdir(libdir, 0755) < 0) {
973        LOGE("cannot create dir '%s': %s\n", libdir, strerror(errno));
974        rc = -errno;
975        goto out;
976    }
977
978    if (chown(libdir, AID_SYSTEM, AID_SYSTEM) < 0) {
979        LOGE("cannot chown dir '%s': %s\n", libdir, strerror(errno));
980        unlink(libdir);
981        rc = -errno;
982        goto out;
983    }
984
985out:
986    if (chmod(dataDir, s.st_mode) < 0) {
987        LOGE("failed to chmod '%s': %s\n", dataDir, strerror(errno));
988        return -1;
989    }
990
991    if (chown(dataDir, s.st_uid, s.st_gid) < 0) {
992        LOGE("failed to chown '%s' : %s\n", dataDir, strerror(errno));
993        return -1;
994    }
995
996    return rc;
997}
998