commands.c revision d0c5f515c05d05c9d24971695337daf9d6ce409c 
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        ALOGE("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        ALOGE("cannot create package path\n");
39        return -1;
40    }
41
42    if (create_pkg_path(libdir, pkgname, PKG_LIB_POSTFIX, 0)) {
43        ALOGE("cannot create package lib path\n");
44        return -1;
45    }
46
47    if (mkdir(pkgdir, 0751) < 0) {
48        ALOGE("cannot create dir '%s': %s\n", pkgdir, strerror(errno));
49        return -errno;
50    }
51    if (chmod(pkgdir, 0751) < 0) {
52        ALOGE("cannot chmod dir '%s': %s\n", pkgdir, strerror(errno));
53        unlink(pkgdir);
54        return -errno;
55    }
56    if (chown(pkgdir, uid, gid) < 0) {
57        ALOGE("cannot chown dir '%s': %s\n", pkgdir, strerror(errno));
58        unlink(pkgdir);
59        return -errno;
60    }
61    if (mkdir(libdir, 0755) < 0) {
62        ALOGE("cannot create dir '%s': %s\n", libdir, strerror(errno));
63        unlink(pkgdir);
64        return -errno;
65    }
66    if (chmod(libdir, 0755) < 0) {
67        ALOGE("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        ALOGE("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        ALOGE("cannot rename dir '%s' to '%s': %s\n", oldpkgdir, newpkgdir, strerror(errno));
104        return -errno;
105    }
106    return 0;
107}
108
109int fix_uid(const char *pkgname, uid_t uid, gid_t gid)
110{
111    char pkgdir[PKG_PATH_MAX];
112    struct stat s;
113    int rc = 0;
114
115    if ((uid < AID_SYSTEM) || (gid < AID_SYSTEM)) {
116        ALOGE("invalid uid/gid: %d %d\n", uid, gid);
117        return -1;
118    }
119
120    if (create_pkg_path(pkgdir, pkgname, PKG_DIR_POSTFIX, 0)) {
121        ALOGE("cannot create package path\n");
122        return -1;
123    }
124
125    if (stat(pkgdir, &s) < 0) return -1;
126
127    if (s.st_uid != 0 || s.st_gid != 0) {
128        ALOGE("fixing uid of non-root pkg: %s %d %d\n", pkgdir, s.st_uid, s.st_gid);
129        return -1;
130    }
131
132    if (chmod(pkgdir, 0751) < 0) {
133        ALOGE("cannot chmod dir '%s': %s\n", pkgdir, strerror(errno));
134        unlink(pkgdir);
135        return -errno;
136    }
137    if (chown(pkgdir, uid, gid) < 0) {
138        ALOGE("cannot chown dir '%s': %s\n", pkgdir, strerror(errno));
139        unlink(pkgdir);
140        return -errno;
141    }
142
143    return 0;
144}
145
146int delete_user_data(const char *pkgname, uid_t persona)
147{
148    char pkgdir[PKG_PATH_MAX];
149
150    if (create_pkg_path(pkgdir, pkgname, PKG_DIR_POSTFIX, persona))
151        return -1;
152
153    /* delete contents, excluding "lib", but not the directory itself */
154    return delete_dir_contents(pkgdir, 0, "lib");
155}
156
157int make_user_data(const char *pkgname, uid_t uid, uid_t persona)
158{
159    char pkgdir[PKG_PATH_MAX];
160    char real_libdir[PKG_PATH_MAX];
161
162    // Create the data dir for the package
163    if (create_pkg_path(pkgdir, pkgname, PKG_DIR_POSTFIX, persona)) {
164        return -1;
165    }
166    if (mkdir(pkgdir, 0751) < 0) {
167        ALOGE("cannot create dir '%s': %s\n", pkgdir, strerror(errno));
168        return -errno;
169    }
170    if (chown(pkgdir, uid, uid) < 0) {
171        ALOGE("cannot chown dir '%s': %s\n", pkgdir, strerror(errno));
172        unlink(pkgdir);
173        return -errno;
174    }
175    return 0;
176}
177
178int delete_persona(uid_t persona)
179{
180    char pkgdir[PKG_PATH_MAX];
181
182    if (create_persona_path(pkgdir, persona))
183        return -1;
184
185    return delete_dir_contents(pkgdir, 1, NULL);
186}
187
188int clone_persona_data(uid_t src_persona, uid_t target_persona, int copy)
189{
190    char src_data_dir[PKG_PATH_MAX];
191    char pkg_path[PKG_PATH_MAX];
192    DIR *d;
193    struct dirent *de;
194    struct stat s;
195    uid_t uid;
196
197    if (create_persona_path(src_data_dir, src_persona)) {
198        return -1;
199    }
200
201    d = opendir(src_data_dir);
202    if (d != NULL) {
203        while ((de = readdir(d))) {
204            const char *name = de->d_name;
205
206            if (de->d_type == DT_DIR) {
207                int subfd;
208                    /* always skip "." and ".." */
209                if (name[0] == '.') {
210                    if (name[1] == 0) continue;
211                    if ((name[1] == '.') && (name[2] == 0)) continue;
212                }
213                /* Create the full path to the package's data dir */
214                create_pkg_path(pkg_path, name, PKG_DIR_POSTFIX, src_persona);
215                /* Get the file stat */
216                if (stat(pkg_path, &s) < 0) continue;
217                /* Get the uid of the package */
218                ALOGI("Adding datadir for uid = %d\n", s.st_uid);
219                uid = (uid_t) s.st_uid % PER_USER_RANGE;
220                /* Create the directory for the target */
221                make_user_data(name, uid + target_persona * PER_USER_RANGE,
222                               target_persona);
223            }
224        }
225        closedir(d);
226    }
227    return 0;
228}
229
230int delete_cache(const char *pkgname)
231{
232    char cachedir[PKG_PATH_MAX];
233
234    if (create_pkg_path(cachedir, pkgname, CACHE_DIR_POSTFIX, 0))
235        return -1;
236
237        /* delete contents, not the directory, no exceptions */
238    return delete_dir_contents(cachedir, 0, 0);
239}
240
241static int64_t disk_free()
242{
243    struct statfs sfs;
244    if (statfs(android_data_dir.path, &sfs) == 0) {
245        return sfs.f_bavail * sfs.f_bsize;
246    } else {
247        ALOGE("Couldn't statfs %s: %s\n", android_data_dir.path, strerror(errno));
248        return -1;
249    }
250}
251
252/* Try to ensure free_size bytes of storage are available.
253 * Returns 0 on success.
254 * This is rather simple-minded because doing a full LRU would
255 * be potentially memory-intensive, and without atime it would
256 * also require that apps constantly modify file metadata even
257 * when just reading from the cache, which is pretty awful.
258 */
259int free_cache(int64_t free_size)
260{
261    const char *name;
262    int dfd, subfd;
263    DIR *d;
264    struct dirent *de;
265    int64_t avail;
266    char datadir[PKG_PATH_MAX];
267
268    avail = disk_free();
269    if (avail < 0) return -1;
270
271    ALOGI("free_cache(%" PRId64 ") avail %" PRId64 "\n", free_size, avail);
272    if (avail >= free_size) return 0;
273
274    if (create_persona_path(datadir, 0)) {
275        ALOGE("couldn't get directory for persona 0");
276        return -1;
277    }
278
279    d = opendir(datadir);
280    if (d == NULL) {
281        ALOGE("cannot open %s: %s\n", datadir, strerror(errno));
282        return -1;
283    }
284    dfd = dirfd(d);
285
286    while ((de = readdir(d))) {
287        if (de->d_type != DT_DIR) continue;
288        name = de->d_name;
289
290        /* always skip "." and ".." */
291        if (name[0] == '.') {
292            if (name[1] == 0) continue;
293            if ((name[1] == '.') && (name[2] == 0)) continue;
294        }
295
296        subfd = openat(dfd, name, O_RDONLY | O_DIRECTORY);
297        if (subfd < 0) continue;
298
299        delete_dir_contents_fd(subfd, "cache");
300        close(subfd);
301
302        avail = disk_free();
303        if (avail >= free_size) {
304            closedir(d);
305            return 0;
306        }
307    }
308    closedir(d);
309
310    /* Fail case - not possible to free space */
311    return -1;
312}
313
314int move_dex(const char *src, const char *dst)
315{
316    char src_dex[PKG_PATH_MAX];
317    char dst_dex[PKG_PATH_MAX];
318
319    if (validate_apk_path(src)) return -1;
320    if (validate_apk_path(dst)) return -1;
321
322    if (create_cache_path(src_dex, src)) return -1;
323    if (create_cache_path(dst_dex, dst)) return -1;
324
325    ALOGV("move %s -> %s\n", src_dex, dst_dex);
326    if (rename(src_dex, dst_dex) < 0) {
327        ALOGE("Couldn't move %s: %s\n", src_dex, strerror(errno));
328        return -1;
329    } else {
330        return 0;
331    }
332}
333
334int rm_dex(const char *path)
335{
336    char dex_path[PKG_PATH_MAX];
337
338    if (validate_apk_path(path)) return -1;
339    if (create_cache_path(dex_path, path)) return -1;
340
341    ALOGV("unlink %s\n", dex_path);
342    if (unlink(dex_path) < 0) {
343        ALOGE("Couldn't unlink %s: %s\n", dex_path, strerror(errno));
344        return -1;
345    } else {
346        return 0;
347    }
348}
349
350int protect(char *pkgname, gid_t gid)
351{
352    struct stat s;
353    char pkgpath[PKG_PATH_MAX];
354
355    if (gid < AID_SYSTEM) return -1;
356
357    if (create_pkg_path_in_dir(pkgpath, &android_app_private_dir, pkgname, ".apk"))
358        return -1;
359
360    if (stat(pkgpath, &s) < 0) return -1;
361
362    if (chown(pkgpath, s.st_uid, gid) < 0) {
363        ALOGE("failed to chgrp '%s': %s\n", pkgpath, strerror(errno));
364        return -1;
365    }
366
367    if (chmod(pkgpath, S_IRUSR|S_IWUSR|S_IRGRP) < 0) {
368        ALOGE("failed to chmod '%s': %s\n", pkgpath, strerror(errno));
369        return -1;
370    }
371
372    return 0;
373}
374
375int get_size(const char *pkgname, const char *apkpath,
376             const char *fwdlock_apkpath, const char *asecpath,
377             int64_t *_codesize, int64_t *_datasize, int64_t *_cachesize,
378             int64_t* _asecsize)
379{
380    DIR *d;
381    int dfd;
382    struct dirent *de;
383    struct stat s;
384    char path[PKG_PATH_MAX];
385
386    int64_t codesize = 0;
387    int64_t datasize = 0;
388    int64_t cachesize = 0;
389    int64_t asecsize = 0;
390
391        /* count the source apk as code -- but only if it's not
392         * on the /system partition and its not on the sdcard.
393         */
394    if (validate_system_app_path(apkpath) &&
395            strncmp(apkpath, android_asec_dir.path, android_asec_dir.len) != 0) {
396        if (stat(apkpath, &s) == 0) {
397            codesize += stat_size(&s);
398        }
399    }
400        /* count the forward locked apk as code if it is given
401         */
402    if (fwdlock_apkpath != NULL && fwdlock_apkpath[0] != '!') {
403        if (stat(fwdlock_apkpath, &s) == 0) {
404            codesize += stat_size(&s);
405        }
406    }
407        /* count the cached dexfile as code */
408    if (!create_cache_path(path, apkpath)) {
409        if (stat(path, &s) == 0) {
410            codesize += stat_size(&s);
411        }
412    }
413
414        /* compute asec size if it is given
415         */
416    if (asecpath != NULL && asecpath[0] != '!') {
417        if (stat(asecpath, &s) == 0) {
418            asecsize += stat_size(&s);
419        }
420    }
421
422    if (create_pkg_path(path, pkgname, PKG_DIR_POSTFIX, 0)) {
423        goto done;
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    *_asecsize = asecsize;
469    return 0;
470}
471
472
473/* a simpler version of dexOptGenerateCacheFileName() */
474int create_cache_path(char path[PKG_PATH_MAX], const char *src)
475{
476    char *tmp;
477    int srclen;
478    int dstlen;
479
480    srclen = strlen(src);
481
482        /* demand that we are an absolute path */
483    if ((src == 0) || (src[0] != '/') || strstr(src,"..")) {
484        return -1;
485    }
486
487    if (srclen > PKG_PATH_MAX) {        // XXX: PKG_NAME_MAX?
488        return -1;
489    }
490
491    dstlen = srclen + strlen(DALVIK_CACHE_PREFIX) +
492        strlen(DALVIK_CACHE_POSTFIX) + 1;
493
494    if (dstlen > PKG_PATH_MAX) {
495        return -1;
496    }
497
498    sprintf(path,"%s%s%s",
499            DALVIK_CACHE_PREFIX,
500            src + 1, /* skip the leading / */
501            DALVIK_CACHE_POSTFIX);
502
503    for(tmp = path + strlen(DALVIK_CACHE_PREFIX); *tmp; tmp++) {
504        if (*tmp == '/') {
505            *tmp = '@';
506        }
507    }
508
509    return 0;
510}
511
512static void run_dexopt(int zip_fd, int odex_fd, const char* input_file_name,
513    const char* dexopt_flags)
514{
515    static const char* DEX_OPT_BIN = "/system/bin/dexopt";
516    static const int MAX_INT_LEN = 12;      // '-'+10dig+'\0' -OR- 0x+8dig
517    char zip_num[MAX_INT_LEN];
518    char odex_num[MAX_INT_LEN];
519
520    sprintf(zip_num, "%d", zip_fd);
521    sprintf(odex_num, "%d", odex_fd);
522
523    execl(DEX_OPT_BIN, DEX_OPT_BIN, "--zip", zip_num, odex_num, input_file_name,
524        dexopt_flags, (char*) NULL);
525    ALOGE("execl(%s) failed: %s\n", DEX_OPT_BIN, strerror(errno));
526}
527
528static int wait_dexopt(pid_t pid, const char* apk_path)
529{
530    int status;
531    pid_t got_pid;
532
533    /*
534     * Wait for the optimization process to finish.
535     */
536    while (1) {
537        got_pid = waitpid(pid, &status, 0);
538        if (got_pid == -1 && errno == EINTR) {
539            printf("waitpid interrupted, retrying\n");
540        } else {
541            break;
542        }
543    }
544    if (got_pid != pid) {
545        ALOGW("waitpid failed: wanted %d, got %d: %s\n",
546            (int) pid, (int) got_pid, strerror(errno));
547        return 1;
548    }
549
550    if (WIFEXITED(status) && WEXITSTATUS(status) == 0) {
551        ALOGV("DexInv: --- END '%s' (success) ---\n", apk_path);
552        return 0;
553    } else {
554        ALOGW("DexInv: --- END '%s' --- status=0x%04x, process failed\n",
555            apk_path, status);
556        return status;      /* always nonzero */
557    }
558}
559
560int dexopt(const char *apk_path, uid_t uid, int is_public)
561{
562    struct utimbuf ut;
563    struct stat apk_stat, dex_stat;
564    char dex_path[PKG_PATH_MAX];
565    char dexopt_flags[PROPERTY_VALUE_MAX];
566    char *end;
567    int res, zip_fd=-1, odex_fd=-1;
568
569        /* Before anything else: is there a .odex file?  If so, we have
570         * pre-optimized the apk and there is nothing to do here.
571         */
572    if (strlen(apk_path) >= (PKG_PATH_MAX - 8)) {
573        return -1;
574    }
575
576    /* platform-specific flags affecting optimization and verification */
577    property_get("dalvik.vm.dexopt-flags", dexopt_flags, "");
578
579    strcpy(dex_path, apk_path);
580    end = strrchr(dex_path, '.');
581    if (end != NULL) {
582        strcpy(end, ".odex");
583        if (stat(dex_path, &dex_stat) == 0) {
584            return 0;
585        }
586    }
587
588    if (create_cache_path(dex_path, apk_path)) {
589        return -1;
590    }
591
592    memset(&apk_stat, 0, sizeof(apk_stat));
593    stat(apk_path, &apk_stat);
594
595    zip_fd = open(apk_path, O_RDONLY, 0);
596    if (zip_fd < 0) {
597        ALOGE("dexopt cannot open '%s' for input\n", apk_path);
598        return -1;
599    }
600
601    unlink(dex_path);
602    odex_fd = open(dex_path, O_RDWR | O_CREAT | O_EXCL, 0644);
603    if (odex_fd < 0) {
604        ALOGE("dexopt cannot open '%s' for output\n", dex_path);
605        goto fail;
606    }
607    if (fchown(odex_fd, AID_SYSTEM, uid) < 0) {
608        ALOGE("dexopt cannot chown '%s'\n", dex_path);
609        goto fail;
610    }
611    if (fchmod(odex_fd,
612               S_IRUSR|S_IWUSR|S_IRGRP |
613               (is_public ? S_IROTH : 0)) < 0) {
614        ALOGE("dexopt cannot chmod '%s'\n", dex_path);
615        goto fail;
616    }
617
618    ALOGV("DexInv: --- BEGIN '%s' ---\n", apk_path);
619
620    pid_t pid;
621    pid = fork();
622    if (pid == 0) {
623        /* child -- drop privileges before continuing */
624        if (setgid(uid) != 0) {
625            ALOGE("setgid(%d) failed during dexopt\n", uid);
626            exit(64);
627        }
628        if (setuid(uid) != 0) {
629            ALOGE("setuid(%d) during dexopt\n", uid);
630            exit(65);
631        }
632        if (flock(odex_fd, LOCK_EX | LOCK_NB) != 0) {
633            ALOGE("flock(%s) failed: %s\n", dex_path, strerror(errno));
634            exit(66);
635        }
636
637        run_dexopt(zip_fd, odex_fd, apk_path, dexopt_flags);
638        exit(67);   /* only get here on exec failure */
639    } else {
640        res = wait_dexopt(pid, apk_path);
641        if (res != 0) {
642            ALOGE("dexopt failed on '%s' res = %d\n", dex_path, res);
643            goto fail;
644        }
645    }
646
647    ut.actime = apk_stat.st_atime;
648    ut.modtime = apk_stat.st_mtime;
649    utime(dex_path, &ut);
650
651    close(odex_fd);
652    close(zip_fd);
653    return 0;
654
655fail:
656    if (odex_fd >= 0) {
657        close(odex_fd);
658        unlink(dex_path);
659    }
660    if (zip_fd >= 0) {
661        close(zip_fd);
662    }
663    return -1;
664}
665
666void mkinnerdirs(char* path, int basepos, mode_t mode, int uid, int gid,
667        struct stat* statbuf)
668{
669    while (path[basepos] != 0) {
670        if (path[basepos] == '/') {
671            path[basepos] = 0;
672            if (lstat(path, statbuf) < 0) {
673                ALOGV("Making directory: %s\n", path);
674                if (mkdir(path, mode) == 0) {
675                    chown(path, uid, gid);
676                } else {
677                    ALOGW("Unable to make directory %s: %s\n", path, strerror(errno));
678                }
679            }
680            path[basepos] = '/';
681            basepos++;
682        }
683        basepos++;
684    }
685}
686
687int movefileordir(char* srcpath, char* dstpath, int dstbasepos,
688        int dstuid, int dstgid, struct stat* statbuf)
689{
690    DIR *d;
691    struct dirent *de;
692    int res;
693
694    int srcend = strlen(srcpath);
695    int dstend = strlen(dstpath);
696
697    if (lstat(srcpath, statbuf) < 0) {
698        ALOGW("Unable to stat %s: %s\n", srcpath, strerror(errno));
699        return 1;
700    }
701
702    if ((statbuf->st_mode&S_IFDIR) == 0) {
703        mkinnerdirs(dstpath, dstbasepos, S_IRWXU|S_IRWXG|S_IXOTH,
704                dstuid, dstgid, statbuf);
705        ALOGV("Renaming %s to %s (uid %d)\n", srcpath, dstpath, dstuid);
706        if (rename(srcpath, dstpath) >= 0) {
707            if (chown(dstpath, dstuid, dstgid) < 0) {
708                ALOGE("cannot chown %s: %s\n", dstpath, strerror(errno));
709                unlink(dstpath);
710                return 1;
711            }
712        } else {
713            ALOGW("Unable to rename %s to %s: %s\n",
714                srcpath, dstpath, strerror(errno));
715            return 1;
716        }
717        return 0;
718    }
719
720    d = opendir(srcpath);
721    if (d == NULL) {
722        ALOGW("Unable to opendir %s: %s\n", srcpath, strerror(errno));
723        return 1;
724    }
725
726    res = 0;
727
728    while ((de = readdir(d))) {
729        const char *name = de->d_name;
730            /* always skip "." and ".." */
731        if (name[0] == '.') {
732            if (name[1] == 0) continue;
733            if ((name[1] == '.') && (name[2] == 0)) continue;
734        }
735
736        if ((srcend+strlen(name)) >= (PKG_PATH_MAX-2)) {
737            ALOGW("Source path too long; skipping: %s/%s\n", srcpath, name);
738            continue;
739        }
740
741        if ((dstend+strlen(name)) >= (PKG_PATH_MAX-2)) {
742            ALOGW("Destination path too long; skipping: %s/%s\n", dstpath, name);
743            continue;
744        }
745
746        srcpath[srcend] = dstpath[dstend] = '/';
747        strcpy(srcpath+srcend+1, name);
748        strcpy(dstpath+dstend+1, name);
749
750        if (movefileordir(srcpath, dstpath, dstbasepos, dstuid, dstgid, statbuf) != 0) {
751            res = 1;
752        }
753
754        // Note: we will be leaving empty directories behind in srcpath,
755        // but that is okay, the package manager will be erasing all of the
756        // data associated with .apks that disappear.
757
758        srcpath[srcend] = dstpath[dstend] = 0;
759    }
760
761    closedir(d);
762    return res;
763}
764
765int movefiles()
766{
767    DIR *d;
768    int dfd, subfd;
769    struct dirent *de;
770    struct stat s;
771    char buf[PKG_PATH_MAX+1];
772    int bufp, bufe, bufi, readlen;
773
774    char srcpkg[PKG_NAME_MAX];
775    char dstpkg[PKG_NAME_MAX];
776    char srcpath[PKG_PATH_MAX];
777    char dstpath[PKG_PATH_MAX];
778    int dstuid=-1, dstgid=-1;
779    int hasspace;
780
781    d = opendir(UPDATE_COMMANDS_DIR_PREFIX);
782    if (d == NULL) {
783        goto done;
784    }
785    dfd = dirfd(d);
786
787        /* Iterate through all files in the directory, executing the
788         * file movements requested there-in.
789         */
790    while ((de = readdir(d))) {
791        const char *name = de->d_name;
792
793        if (de->d_type == DT_DIR) {
794            continue;
795        } else {
796            subfd = openat(dfd, name, O_RDONLY);
797            if (subfd < 0) {
798                ALOGW("Unable to open update commands at %s%s\n",
799                        UPDATE_COMMANDS_DIR_PREFIX, name);
800                continue;
801            }
802
803            bufp = 0;
804            bufe = 0;
805            buf[PKG_PATH_MAX] = 0;
806            srcpkg[0] = dstpkg[0] = 0;
807            while (1) {
808                bufi = bufp;
809                while (bufi < bufe && buf[bufi] != '\n') {
810                    bufi++;
811                }
812                if (bufi < bufe) {
813                    buf[bufi] = 0;
814                    ALOGV("Processing line: %s\n", buf+bufp);
815                    hasspace = 0;
816                    while (bufp < bufi && isspace(buf[bufp])) {
817                        hasspace = 1;
818                        bufp++;
819                    }
820                    if (buf[bufp] == '#' || bufp == bufi) {
821                        // skip comments and empty lines.
822                    } else if (hasspace) {
823                        if (dstpkg[0] == 0) {
824                            ALOGW("Path before package line in %s%s: %s\n",
825                                    UPDATE_COMMANDS_DIR_PREFIX, name, buf+bufp);
826                        } else if (srcpkg[0] == 0) {
827                            // Skip -- source package no longer exists.
828                        } else {
829                            ALOGV("Move file: %s (from %s to %s)\n", buf+bufp, srcpkg, dstpkg);
830                            if (!create_move_path(srcpath, srcpkg, buf+bufp, 0) &&
831                                    !create_move_path(dstpath, dstpkg, buf+bufp, 0)) {
832                                movefileordir(srcpath, dstpath,
833                                        strlen(dstpath)-strlen(buf+bufp),
834                                        dstuid, dstgid, &s);
835                            }
836                        }
837                    } else {
838                        char* div = strchr(buf+bufp, ':');
839                        if (div == NULL) {
840                            ALOGW("Bad package spec in %s%s; no ':' sep: %s\n",
841                                    UPDATE_COMMANDS_DIR_PREFIX, name, buf+bufp);
842                        } else {
843                            *div = 0;
844                            div++;
845                            if (strlen(buf+bufp) < PKG_NAME_MAX) {
846                                strcpy(dstpkg, buf+bufp);
847                            } else {
848                                srcpkg[0] = dstpkg[0] = 0;
849                                ALOGW("Package name too long in %s%s: %s\n",
850                                        UPDATE_COMMANDS_DIR_PREFIX, name, buf+bufp);
851                            }
852                            if (strlen(div) < PKG_NAME_MAX) {
853                                strcpy(srcpkg, div);
854                            } else {
855                                srcpkg[0] = dstpkg[0] = 0;
856                                ALOGW("Package name too long in %s%s: %s\n",
857                                        UPDATE_COMMANDS_DIR_PREFIX, name, div);
858                            }
859                            if (srcpkg[0] != 0) {
860                                if (!create_pkg_path(srcpath, srcpkg, PKG_DIR_POSTFIX, 0)) {
861                                    if (lstat(srcpath, &s) < 0) {
862                                        // Package no longer exists -- skip.
863                                        srcpkg[0] = 0;
864                                    }
865                                } else {
866                                    srcpkg[0] = 0;
867                                    ALOGW("Can't create path %s in %s%s\n",
868                                            div, UPDATE_COMMANDS_DIR_PREFIX, name);
869                                }
870                                if (srcpkg[0] != 0) {
871                                    if (!create_pkg_path(dstpath, dstpkg, PKG_DIR_POSTFIX, 0)) {
872                                        if (lstat(dstpath, &s) == 0) {
873                                            dstuid = s.st_uid;
874                                            dstgid = s.st_gid;
875                                        } else {
876                                            // Destination package doesn't
877                                            // exist...  due to original-package,
878                                            // this is normal, so don't be
879                                            // noisy about it.
880                                            srcpkg[0] = 0;
881                                        }
882                                    } else {
883                                        srcpkg[0] = 0;
884                                        ALOGW("Can't create path %s in %s%s\n",
885                                                div, UPDATE_COMMANDS_DIR_PREFIX, name);
886                                    }
887                                }
888                                ALOGV("Transfering from %s to %s: uid=%d\n",
889                                    srcpkg, dstpkg, dstuid);
890                            }
891                        }
892                    }
893                    bufp = bufi+1;
894                } else {
895                    if (bufp == 0) {
896                        if (bufp < bufe) {
897                            ALOGW("Line too long in %s%s, skipping: %s\n",
898                                    UPDATE_COMMANDS_DIR_PREFIX, name, buf);
899                        }
900                    } else if (bufp < bufe) {
901                        memcpy(buf, buf+bufp, bufe-bufp);
902                        bufe -= bufp;
903                        bufp = 0;
904                    }
905                    readlen = read(subfd, buf+bufe, PKG_PATH_MAX-bufe);
906                    if (readlen < 0) {
907                        ALOGW("Failure reading update commands in %s%s: %s\n",
908                                UPDATE_COMMANDS_DIR_PREFIX, name, strerror(errno));
909                        break;
910                    } else if (readlen == 0) {
911                        break;
912                    }
913                    bufe += readlen;
914                    buf[bufe] = 0;
915                    ALOGV("Read buf: %s\n", buf);
916                }
917            }
918            close(subfd);
919        }
920    }
921    closedir(d);
922done:
923    return 0;
924}
925
926int linklib(const char* dataDir, const char* asecLibDir)
927{
928    char libdir[PKG_PATH_MAX];
929    struct stat s, libStat;
930    int rc = 0;
931
932    const size_t libdirLen = strlen(dataDir) + strlen(PKG_LIB_POSTFIX);
933    if (libdirLen >= PKG_PATH_MAX) {
934        ALOGE("library dir len too large");
935        return -1;
936    }
937
938    if (snprintf(libdir, sizeof(libdir), "%s%s", dataDir, PKG_LIB_POSTFIX) != (ssize_t)libdirLen) {
939        ALOGE("library dir not written successfully: %s\n", strerror(errno));
940        return -1;
941    }
942
943    if (stat(dataDir, &s) < 0) return -1;
944
945    if (chown(dataDir, 0, 0) < 0) {
946        ALOGE("failed to chown '%s': %s\n", dataDir, strerror(errno));
947        return -1;
948    }
949
950    if (chmod(dataDir, 0700) < 0) {
951        ALOGE("failed to chmod '%s': %s\n", dataDir, strerror(errno));
952        rc = -1;
953        goto out;
954    }
955
956    if (lstat(libdir, &libStat) < 0) {
957        ALOGE("couldn't stat lib dir: %s\n", strerror(errno));
958        rc = -1;
959        goto out;
960    }
961
962    if (S_ISDIR(libStat.st_mode)) {
963        if (delete_dir_contents(libdir, 1, 0) < 0) {
964            rc = -1;
965            goto out;
966        }
967    } else if (S_ISLNK(libStat.st_mode)) {
968        if (unlink(libdir) < 0) {
969            rc = -1;
970            goto out;
971        }
972    }
973
974    if (symlink(asecLibDir, libdir) < 0) {
975        ALOGE("couldn't symlink directory '%s' -> '%s': %s\n", libdir, asecLibDir, strerror(errno));
976        rc = -errno;
977        goto out;
978    }
979
980    if (lchown(libdir, AID_SYSTEM, AID_SYSTEM) < 0) {
981        ALOGE("cannot chown dir '%s': %s\n", libdir, strerror(errno));
982        unlink(libdir);
983        rc = -errno;
984        goto out;
985    }
986
987out:
988    if (chmod(dataDir, s.st_mode) < 0) {
989        ALOGE("failed to chmod '%s': %s\n", dataDir, strerror(errno));
990        rc = -errno;
991    }
992
993    if (chown(dataDir, s.st_uid, s.st_gid) < 0) {
994        ALOGE("failed to chown '%s' : %s\n", dataDir, strerror(errno));
995        return -errno;
996    }
997
998    return rc;
999}
1000
1001int unlinklib(const char* dataDir)
1002{
1003    char libdir[PKG_PATH_MAX];
1004    struct stat s, libStat;
1005    int rc = 0;
1006
1007    const size_t libdirLen = strlen(dataDir) + strlen(PKG_LIB_POSTFIX);
1008    if (libdirLen >= PKG_PATH_MAX) {
1009        return -1;
1010    }
1011
1012    if (snprintf(libdir, sizeof(libdir), "%s%s", dataDir, PKG_LIB_POSTFIX) != (ssize_t)libdirLen) {
1013        ALOGE("library dir not written successfully: %s\n", strerror(errno));
1014        return -1;
1015    }
1016
1017    if (stat(dataDir, &s) < 0) {
1018        ALOGE("couldn't state data dir");
1019        return -1;
1020    }
1021
1022    if (chown(dataDir, 0, 0) < 0) {
1023        ALOGE("failed to chown '%s': %s\n", dataDir, strerror(errno));
1024        return -1;
1025    }
1026
1027    if (chmod(dataDir, 0700) < 0) {
1028        ALOGE("failed to chmod '%s': %s\n", dataDir, strerror(errno));
1029        rc = -1;
1030        goto out;
1031    }
1032
1033    if (lstat(libdir, &libStat) < 0) {
1034        ALOGE("couldn't stat lib dir: %s\n", strerror(errno));
1035        rc = -1;
1036        goto out;
1037    }
1038
1039    if (S_ISDIR(libStat.st_mode)) {
1040        if (delete_dir_contents(libdir, 1, 0) < 0) {
1041            rc = -1;
1042            goto out;
1043        }
1044    } else if (S_ISLNK(libStat.st_mode)) {
1045        if (unlink(libdir) < 0) {
1046            rc = -1;
1047            goto out;
1048        }
1049    }
1050
1051    if (mkdir(libdir, 0755) < 0) {
1052        ALOGE("cannot create dir '%s': %s\n", libdir, strerror(errno));
1053        rc = -errno;
1054        goto out;
1055    }
1056
1057    if (chown(libdir, AID_SYSTEM, AID_SYSTEM) < 0) {
1058        ALOGE("cannot chown dir '%s': %s\n", libdir, strerror(errno));
1059        unlink(libdir);
1060        rc = -errno;
1061        goto out;
1062    }
1063
1064out:
1065    if (chmod(dataDir, s.st_mode) < 0) {
1066        ALOGE("failed to chmod '%s': %s\n", dataDir, strerror(errno));
1067        rc = -1;
1068    }
1069
1070    if (chown(dataDir, s.st_uid, s.st_gid) < 0) {
1071        ALOGE("failed to chown '%s' : %s\n", dataDir, strerror(errno));
1072        return -1;
1073    }
1074
1075    return rc;
1076}
1077