commands.c revision 292f8bc9d1b790ab975a87a842c7fabc908b97e0 
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
188    avail = disk_free();
189    if (avail < 0) return -1;
190
191    LOGI("free_cache(%" PRId64 ") avail %" PRId64 "\n", free_size, avail);
192    if (avail >= free_size) return 0;
193
194    d = opendir(android_data_dir.path);
195    if (d == NULL) {
196        LOGE("cannot open %s: %s\n", android_data_dir.path, strerror(errno));
197        return -1;
198    }
199    dfd = dirfd(d);
200
201    while ((de = readdir(d))) {
202        if (de->d_type != DT_DIR) continue;
203        name = de->d_name;
204
205        /* always skip "." and ".." */
206        if (name[0] == '.') {
207            if (name[1] == 0) continue;
208            if ((name[1] == '.') && (name[2] == 0)) continue;
209        }
210
211        subfd = openat(dfd, name, O_RDONLY | O_DIRECTORY);
212        if (subfd < 0) continue;
213
214        delete_dir_contents_fd(subfd, "cache");
215        close(subfd);
216
217        avail = disk_free();
218        if (avail >= free_size) {
219            closedir(d);
220            return 0;
221        }
222    }
223    closedir(d);
224
225    /* Fail case - not possible to free space */
226    return -1;
227}
228
229int move_dex(const char *src, const char *dst)
230{
231    char src_dex[PKG_PATH_MAX];
232    char dst_dex[PKG_PATH_MAX];
233
234    if (validate_apk_path(src)) return -1;
235    if (validate_apk_path(dst)) return -1;
236
237    if (create_cache_path(src_dex, src)) return -1;
238    if (create_cache_path(dst_dex, dst)) return -1;
239
240    LOGV("move %s -> %s\n", src_dex, dst_dex);
241    if (rename(src_dex, dst_dex) < 0) {
242        LOGE("Couldn't move %s: %s\n", src_dex, strerror(errno));
243        return -1;
244    } else {
245        return 0;
246    }
247}
248
249int rm_dex(const char *path)
250{
251    char dex_path[PKG_PATH_MAX];
252
253    if (validate_apk_path(path)) return -1;
254    if (create_cache_path(dex_path, path)) return -1;
255
256    LOGV("unlink %s\n", dex_path);
257    if (unlink(dex_path) < 0) {
258        LOGE("Couldn't unlink %s: %s\n", dex_path, strerror(errno));
259        return -1;
260    } else {
261        return 0;
262    }
263}
264
265int protect(char *pkgname, gid_t gid)
266{
267    struct stat s;
268    char pkgpath[PKG_PATH_MAX];
269
270    if (gid < AID_SYSTEM) return -1;
271
272    if (create_pkg_path_in_dir(pkgpath, &android_app_private_dir, pkgname, ".apk"))
273        return -1;
274
275    if (stat(pkgpath, &s) < 0) return -1;
276
277    if (chown(pkgpath, s.st_uid, gid) < 0) {
278        LOGE("failed to chgrp '%s': %s\n", pkgpath, strerror(errno));
279        return -1;
280    }
281
282    if (chmod(pkgpath, S_IRUSR|S_IWUSR|S_IRGRP) < 0) {
283        LOGE("failed to chmod '%s': %s\n", pkgpath, strerror(errno));
284        return -1;
285    }
286
287    return 0;
288}
289
290int get_size(const char *pkgname, const char *apkpath,
291             const char *fwdlock_apkpath, const char *asecpath,
292             int64_t *_codesize, int64_t *_datasize, int64_t *_cachesize,
293             int64_t* _asecsize)
294{
295    DIR *d;
296    int dfd;
297    struct dirent *de;
298    struct stat s;
299    char path[PKG_PATH_MAX];
300
301    int64_t codesize = 0;
302    int64_t datasize = 0;
303    int64_t cachesize = 0;
304    int64_t asecsize = 0;
305
306        /* count the source apk as code -- but only if it's not
307         * on the /system partition and its not on the sdcard.
308         */
309    if (validate_system_app_path(apkpath) &&
310            strncmp(apkpath, android_asec_dir.path, android_asec_dir.len) != 0) {
311        if (stat(apkpath, &s) == 0) {
312            codesize += stat_size(&s);
313        }
314    }
315        /* count the forward locked apk as code if it is given
316         */
317    if (fwdlock_apkpath != NULL && fwdlock_apkpath[0] != '!') {
318        if (stat(fwdlock_apkpath, &s) == 0) {
319            codesize += stat_size(&s);
320        }
321    }
322        /* count the cached dexfile as code */
323    if (!create_cache_path(path, apkpath)) {
324        if (stat(path, &s) == 0) {
325            codesize += stat_size(&s);
326        }
327    }
328
329        /* compute asec size if it is given
330         */
331    if (asecpath != NULL && asecpath[0] != '!') {
332        if (stat(asecpath, &s) == 0) {
333            asecsize += stat_size(&s);
334        }
335    }
336
337    if (create_pkg_path(path, pkgname, PKG_DIR_POSTFIX, 0)) {
338        goto done;
339    }
340
341    d = opendir(path);
342    if (d == NULL) {
343        goto done;
344    }
345    dfd = dirfd(d);
346
347    /* most stuff in the pkgdir is data, except for the "cache"
348     * directory and below, which is cache, and the "lib" directory
349     * and below, which is code...
350     */
351    while ((de = readdir(d))) {
352        const char *name = de->d_name;
353
354        if (de->d_type == DT_DIR) {
355            int subfd;
356                /* always skip "." and ".." */
357            if (name[0] == '.') {
358                if (name[1] == 0) continue;
359                if ((name[1] == '.') && (name[2] == 0)) continue;
360            }
361            subfd = openat(dfd, name, O_RDONLY | O_DIRECTORY);
362            if (subfd >= 0) {
363                int64_t size = calculate_dir_size(subfd);
364                if (!strcmp(name,"lib")) {
365                    codesize += size;
366                } else if(!strcmp(name,"cache")) {
367                    cachesize += size;
368                } else {
369                    datasize += size;
370                }
371            }
372        } else {
373            if (fstatat(dfd, name, &s, AT_SYMLINK_NOFOLLOW) == 0) {
374                datasize += stat_size(&s);
375            }
376        }
377    }
378    closedir(d);
379done:
380    *_codesize = codesize;
381    *_datasize = datasize;
382    *_cachesize = cachesize;
383    *_asecsize = asecsize;
384    return 0;
385}
386
387
388/* a simpler version of dexOptGenerateCacheFileName() */
389int create_cache_path(char path[PKG_PATH_MAX], const char *src)
390{
391    char *tmp;
392    int srclen;
393    int dstlen;
394
395    srclen = strlen(src);
396
397        /* demand that we are an absolute path */
398    if ((src == 0) || (src[0] != '/') || strstr(src,"..")) {
399        return -1;
400    }
401
402    if (srclen > PKG_PATH_MAX) {        // XXX: PKG_NAME_MAX?
403        return -1;
404    }
405
406    dstlen = srclen + strlen(DALVIK_CACHE_PREFIX) +
407        strlen(DALVIK_CACHE_POSTFIX) + 1;
408
409    if (dstlen > PKG_PATH_MAX) {
410        return -1;
411    }
412
413    sprintf(path,"%s%s%s",
414            DALVIK_CACHE_PREFIX,
415            src + 1, /* skip the leading / */
416            DALVIK_CACHE_POSTFIX);
417
418    for(tmp = path + strlen(DALVIK_CACHE_PREFIX); *tmp; tmp++) {
419        if (*tmp == '/') {
420            *tmp = '@';
421        }
422    }
423
424    return 0;
425}
426
427static void run_dexopt(int zip_fd, int odex_fd, const char* input_file_name,
428    const char* dexopt_flags)
429{
430    static const char* DEX_OPT_BIN = "/system/bin/dexopt";
431    static const int MAX_INT_LEN = 12;      // '-'+10dig+'\0' -OR- 0x+8dig
432    char zip_num[MAX_INT_LEN];
433    char odex_num[MAX_INT_LEN];
434
435    sprintf(zip_num, "%d", zip_fd);
436    sprintf(odex_num, "%d", odex_fd);
437
438    execl(DEX_OPT_BIN, DEX_OPT_BIN, "--zip", zip_num, odex_num, input_file_name,
439        dexopt_flags, (char*) NULL);
440    LOGE("execl(%s) failed: %s\n", DEX_OPT_BIN, strerror(errno));
441}
442
443static int wait_dexopt(pid_t pid, const char* apk_path)
444{
445    int status;
446    pid_t got_pid;
447
448    /*
449     * Wait for the optimization process to finish.
450     */
451    while (1) {
452        got_pid = waitpid(pid, &status, 0);
453        if (got_pid == -1 && errno == EINTR) {
454            printf("waitpid interrupted, retrying\n");
455        } else {
456            break;
457        }
458    }
459    if (got_pid != pid) {
460        LOGW("waitpid failed: wanted %d, got %d: %s\n",
461            (int) pid, (int) got_pid, strerror(errno));
462        return 1;
463    }
464
465    if (WIFEXITED(status) && WEXITSTATUS(status) == 0) {
466        LOGV("DexInv: --- END '%s' (success) ---\n", apk_path);
467        return 0;
468    } else {
469        LOGW("DexInv: --- END '%s' --- status=0x%04x, process failed\n",
470            apk_path, status);
471        return status;      /* always nonzero */
472    }
473}
474
475int dexopt(const char *apk_path, uid_t uid, int is_public)
476{
477    struct utimbuf ut;
478    struct stat apk_stat, dex_stat;
479    char dex_path[PKG_PATH_MAX];
480    char dexopt_flags[PROPERTY_VALUE_MAX];
481    char *end;
482    int res, zip_fd=-1, odex_fd=-1;
483
484        /* Before anything else: is there a .odex file?  If so, we have
485         * pre-optimized the apk and there is nothing to do here.
486         */
487    if (strlen(apk_path) >= (PKG_PATH_MAX - 8)) {
488        return -1;
489    }
490
491    /* platform-specific flags affecting optimization and verification */
492    property_get("dalvik.vm.dexopt-flags", dexopt_flags, "");
493
494    strcpy(dex_path, apk_path);
495    end = strrchr(dex_path, '.');
496    if (end != NULL) {
497        strcpy(end, ".odex");
498        if (stat(dex_path, &dex_stat) == 0) {
499            return 0;
500        }
501    }
502
503    if (create_cache_path(dex_path, apk_path)) {
504        return -1;
505    }
506
507    memset(&apk_stat, 0, sizeof(apk_stat));
508    stat(apk_path, &apk_stat);
509
510    zip_fd = open(apk_path, O_RDONLY, 0);
511    if (zip_fd < 0) {
512        LOGE("dexopt cannot open '%s' for input\n", apk_path);
513        return -1;
514    }
515
516    unlink(dex_path);
517    odex_fd = open(dex_path, O_RDWR | O_CREAT | O_EXCL, 0644);
518    if (odex_fd < 0) {
519        LOGE("dexopt cannot open '%s' for output\n", dex_path);
520        goto fail;
521    }
522    if (fchown(odex_fd, AID_SYSTEM, uid) < 0) {
523        LOGE("dexopt cannot chown '%s'\n", dex_path);
524        goto fail;
525    }
526    if (fchmod(odex_fd,
527               S_IRUSR|S_IWUSR|S_IRGRP |
528               (is_public ? S_IROTH : 0)) < 0) {
529        LOGE("dexopt cannot chmod '%s'\n", dex_path);
530        goto fail;
531    }
532
533    LOGV("DexInv: --- BEGIN '%s' ---\n", apk_path);
534
535    pid_t pid;
536    pid = fork();
537    if (pid == 0) {
538        /* child -- drop privileges before continuing */
539        if (setgid(uid) != 0) {
540            LOGE("setgid(%d) failed during dexopt\n", uid);
541            exit(64);
542        }
543        if (setuid(uid) != 0) {
544            LOGE("setuid(%d) during dexopt\n", uid);
545            exit(65);
546        }
547        if (flock(odex_fd, LOCK_EX | LOCK_NB) != 0) {
548            LOGE("flock(%s) failed: %s\n", dex_path, strerror(errno));
549            exit(66);
550        }
551
552        run_dexopt(zip_fd, odex_fd, apk_path, dexopt_flags);
553        exit(67);   /* only get here on exec failure */
554    } else {
555        res = wait_dexopt(pid, apk_path);
556        if (res != 0) {
557            LOGE("dexopt failed on '%s' res = %d\n", dex_path, res);
558            goto fail;
559        }
560    }
561
562    ut.actime = apk_stat.st_atime;
563    ut.modtime = apk_stat.st_mtime;
564    utime(dex_path, &ut);
565
566    close(odex_fd);
567    close(zip_fd);
568    return 0;
569
570fail:
571    if (odex_fd >= 0) {
572        close(odex_fd);
573        unlink(dex_path);
574    }
575    if (zip_fd >= 0) {
576        close(zip_fd);
577    }
578    return -1;
579}
580
581int create_move_path(char path[PKG_PATH_MAX],
582    const char* pkgname,
583    const char* leaf,
584    uid_t persona)
585{
586    if ((android_data_dir.len + strlen(pkgname) + strlen(leaf) + 1) >= PKG_PATH_MAX) {
587        return -1;
588    }
589
590    sprintf(path, "%s%s%s/%s", android_data_dir.path, PRIMARY_USER_PREFIX, pkgname, leaf);
591    return 0;
592}
593
594void mkinnerdirs(char* path, int basepos, mode_t mode, int uid, int gid,
595        struct stat* statbuf)
596{
597    while (path[basepos] != 0) {
598        if (path[basepos] == '/') {
599            path[basepos] = 0;
600            if (lstat(path, statbuf) < 0) {
601                LOGV("Making directory: %s\n", path);
602                if (mkdir(path, mode) == 0) {
603                    chown(path, uid, gid);
604                } else {
605                    LOGW("Unable to make directory %s: %s\n", path, strerror(errno));
606                }
607            }
608            path[basepos] = '/';
609            basepos++;
610        }
611        basepos++;
612    }
613}
614
615int movefileordir(char* srcpath, char* dstpath, int dstbasepos,
616        int dstuid, int dstgid, struct stat* statbuf)
617{
618    DIR *d;
619    struct dirent *de;
620    int res;
621
622    int srcend = strlen(srcpath);
623    int dstend = strlen(dstpath);
624
625    if (lstat(srcpath, statbuf) < 0) {
626        LOGW("Unable to stat %s: %s\n", srcpath, strerror(errno));
627        return 1;
628    }
629
630    if ((statbuf->st_mode&S_IFDIR) == 0) {
631        mkinnerdirs(dstpath, dstbasepos, S_IRWXU|S_IRWXG|S_IXOTH,
632                dstuid, dstgid, statbuf);
633        LOGV("Renaming %s to %s (uid %d)\n", srcpath, dstpath, dstuid);
634        if (rename(srcpath, dstpath) >= 0) {
635            if (chown(dstpath, dstuid, dstgid) < 0) {
636                LOGE("cannot chown %s: %s\n", dstpath, strerror(errno));
637                unlink(dstpath);
638                return 1;
639            }
640        } else {
641            LOGW("Unable to rename %s to %s: %s\n",
642                srcpath, dstpath, strerror(errno));
643            return 1;
644        }
645        return 0;
646    }
647
648    d = opendir(srcpath);
649    if (d == NULL) {
650        LOGW("Unable to opendir %s: %s\n", srcpath, strerror(errno));
651        return 1;
652    }
653
654    res = 0;
655
656    while ((de = readdir(d))) {
657        const char *name = de->d_name;
658            /* always skip "." and ".." */
659        if (name[0] == '.') {
660            if (name[1] == 0) continue;
661            if ((name[1] == '.') && (name[2] == 0)) continue;
662        }
663
664        if ((srcend+strlen(name)) >= (PKG_PATH_MAX-2)) {
665            LOGW("Source path too long; skipping: %s/%s\n", srcpath, name);
666            continue;
667        }
668
669        if ((dstend+strlen(name)) >= (PKG_PATH_MAX-2)) {
670            LOGW("Destination path too long; skipping: %s/%s\n", dstpath, name);
671            continue;
672        }
673
674        srcpath[srcend] = dstpath[dstend] = '/';
675        strcpy(srcpath+srcend+1, name);
676        strcpy(dstpath+dstend+1, name);
677
678        if (movefileordir(srcpath, dstpath, dstbasepos, dstuid, dstgid, statbuf) != 0) {
679            res = 1;
680        }
681
682        // Note: we will be leaving empty directories behind in srcpath,
683        // but that is okay, the package manager will be erasing all of the
684        // data associated with .apks that disappear.
685
686        srcpath[srcend] = dstpath[dstend] = 0;
687    }
688
689    closedir(d);
690    return res;
691}
692
693int movefiles()
694{
695    DIR *d;
696    int dfd, subfd;
697    struct dirent *de;
698    struct stat s;
699    char buf[PKG_PATH_MAX+1];
700    int bufp, bufe, bufi, readlen;
701
702    char srcpkg[PKG_NAME_MAX];
703    char dstpkg[PKG_NAME_MAX];
704    char srcpath[PKG_PATH_MAX];
705    char dstpath[PKG_PATH_MAX];
706    int dstuid=-1, dstgid=-1;
707    int hasspace;
708
709    d = opendir(UPDATE_COMMANDS_DIR_PREFIX);
710    if (d == NULL) {
711        goto done;
712    }
713    dfd = dirfd(d);
714
715        /* Iterate through all files in the directory, executing the
716         * file movements requested there-in.
717         */
718    while ((de = readdir(d))) {
719        const char *name = de->d_name;
720
721        if (de->d_type == DT_DIR) {
722            continue;
723        } else {
724            subfd = openat(dfd, name, O_RDONLY);
725            if (subfd < 0) {
726                LOGW("Unable to open update commands at %s%s\n",
727                        UPDATE_COMMANDS_DIR_PREFIX, name);
728                continue;
729            }
730
731            bufp = 0;
732            bufe = 0;
733            buf[PKG_PATH_MAX] = 0;
734            srcpkg[0] = dstpkg[0] = 0;
735            while (1) {
736                bufi = bufp;
737                while (bufi < bufe && buf[bufi] != '\n') {
738                    bufi++;
739                }
740                if (bufi < bufe) {
741                    buf[bufi] = 0;
742                    LOGV("Processing line: %s\n", buf+bufp);
743                    hasspace = 0;
744                    while (bufp < bufi && isspace(buf[bufp])) {
745                        hasspace = 1;
746                        bufp++;
747                    }
748                    if (buf[bufp] == '#' || bufp == bufi) {
749                        // skip comments and empty lines.
750                    } else if (hasspace) {
751                        if (dstpkg[0] == 0) {
752                            LOGW("Path before package line in %s%s: %s\n",
753                                    UPDATE_COMMANDS_DIR_PREFIX, name, buf+bufp);
754                        } else if (srcpkg[0] == 0) {
755                            // Skip -- source package no longer exists.
756                        } else {
757                            LOGV("Move file: %s (from %s to %s)\n", buf+bufp, srcpkg, dstpkg);
758                            if (!create_move_path(srcpath, srcpkg, buf+bufp, 0) &&
759                                    !create_move_path(dstpath, dstpkg, buf+bufp, 0)) {
760                                movefileordir(srcpath, dstpath,
761                                        strlen(dstpath)-strlen(buf+bufp),
762                                        dstuid, dstgid, &s);
763                            }
764                        }
765                    } else {
766                        char* div = strchr(buf+bufp, ':');
767                        if (div == NULL) {
768                            LOGW("Bad package spec in %s%s; no ':' sep: %s\n",
769                                    UPDATE_COMMANDS_DIR_PREFIX, name, buf+bufp);
770                        } else {
771                            *div = 0;
772                            div++;
773                            if (strlen(buf+bufp) < PKG_NAME_MAX) {
774                                strcpy(dstpkg, buf+bufp);
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, buf+bufp);
779                            }
780                            if (strlen(div) < PKG_NAME_MAX) {
781                                strcpy(srcpkg, div);
782                            } else {
783                                srcpkg[0] = dstpkg[0] = 0;
784                                LOGW("Package name too long in %s%s: %s\n",
785                                        UPDATE_COMMANDS_DIR_PREFIX, name, div);
786                            }
787                            if (srcpkg[0] != 0) {
788                                if (!create_pkg_path(srcpath, srcpkg, PKG_DIR_POSTFIX, 0)) {
789                                    if (lstat(srcpath, &s) < 0) {
790                                        // Package no longer exists -- skip.
791                                        srcpkg[0] = 0;
792                                    }
793                                } else {
794                                    srcpkg[0] = 0;
795                                    LOGW("Can't create path %s in %s%s\n",
796                                            div, UPDATE_COMMANDS_DIR_PREFIX, name);
797                                }
798                                if (srcpkg[0] != 0) {
799                                    if (!create_pkg_path(dstpath, dstpkg, PKG_DIR_POSTFIX, 0)) {
800                                        if (lstat(dstpath, &s) == 0) {
801                                            dstuid = s.st_uid;
802                                            dstgid = s.st_gid;
803                                        } else {
804                                            // Destination package doesn't
805                                            // exist...  due to original-package,
806                                            // this is normal, so don't be
807                                            // noisy about it.
808                                            srcpkg[0] = 0;
809                                        }
810                                    } else {
811                                        srcpkg[0] = 0;
812                                        LOGW("Can't create path %s in %s%s\n",
813                                                div, UPDATE_COMMANDS_DIR_PREFIX, name);
814                                    }
815                                }
816                                LOGV("Transfering from %s to %s: uid=%d\n",
817                                    srcpkg, dstpkg, dstuid);
818                            }
819                        }
820                    }
821                    bufp = bufi+1;
822                } else {
823                    if (bufp == 0) {
824                        if (bufp < bufe) {
825                            LOGW("Line too long in %s%s, skipping: %s\n",
826                                    UPDATE_COMMANDS_DIR_PREFIX, name, buf);
827                        }
828                    } else if (bufp < bufe) {
829                        memcpy(buf, buf+bufp, bufe-bufp);
830                        bufe -= bufp;
831                        bufp = 0;
832                    }
833                    readlen = read(subfd, buf+bufe, PKG_PATH_MAX-bufe);
834                    if (readlen < 0) {
835                        LOGW("Failure reading update commands in %s%s: %s\n",
836                                UPDATE_COMMANDS_DIR_PREFIX, name, strerror(errno));
837                        break;
838                    } else if (readlen == 0) {
839                        break;
840                    }
841                    bufe += readlen;
842                    buf[bufe] = 0;
843                    LOGV("Read buf: %s\n", buf);
844                }
845            }
846            close(subfd);
847        }
848    }
849    closedir(d);
850done:
851    return 0;
852}
853
854int linklib(const char* dataDir, const char* asecLibDir)
855{
856    char libdir[PKG_PATH_MAX];
857    struct stat s, libStat;
858    int rc = 0;
859
860    const size_t libdirLen = strlen(dataDir) + strlen(PKG_LIB_POSTFIX);
861    if (libdirLen >= PKG_PATH_MAX) {
862        LOGE("library dir len too large");
863        return -1;
864    }
865
866    if (snprintf(libdir, sizeof(libdir), "%s%s", dataDir, PKG_LIB_POSTFIX) != (ssize_t)libdirLen) {
867        LOGE("library dir not written successfully: %s\n", strerror(errno));
868        return -1;
869    }
870
871    if (stat(dataDir, &s) < 0) return -1;
872
873    if (chown(dataDir, 0, 0) < 0) {
874        LOGE("failed to chown '%s': %s\n", dataDir, strerror(errno));
875        return -1;
876    }
877
878    if (chmod(dataDir, 0700) < 0) {
879        LOGE("failed to chmod '%s': %s\n", dataDir, strerror(errno));
880        rc = -1;
881        goto out;
882    }
883
884    if (lstat(libdir, &libStat) < 0) {
885        LOGE("couldn't stat lib dir: %s\n", strerror(errno));
886        rc = -1;
887        goto out;
888    }
889
890    if (S_ISDIR(libStat.st_mode)) {
891        if (delete_dir_contents(libdir, 1, 0) < 0) {
892            rc = -1;
893            goto out;
894        }
895    } else if (S_ISLNK(libStat.st_mode)) {
896        if (unlink(libdir) < 0) {
897            rc = -1;
898            goto out;
899        }
900    }
901
902    if (symlink(asecLibDir, libdir) < 0) {
903        LOGE("couldn't symlink directory '%s' -> '%s': %s\n", libdir, asecLibDir, strerror(errno));
904        rc = -errno;
905        goto out;
906    }
907
908    if (lchown(libdir, AID_SYSTEM, AID_SYSTEM) < 0) {
909        LOGE("cannot chown dir '%s': %s\n", libdir, strerror(errno));
910        unlink(libdir);
911        rc = -errno;
912        goto out;
913    }
914
915out:
916    if (chmod(dataDir, s.st_mode) < 0) {
917        LOGE("failed to chmod '%s': %s\n", dataDir, strerror(errno));
918        return -errno;
919    }
920
921    if (chown(dataDir, s.st_uid, s.st_gid) < 0) {
922        LOGE("failed to chown '%s' : %s\n", dataDir, strerror(errno));
923        return -errno;
924    }
925
926    return rc;
927}
928
929int unlinklib(const char* dataDir)
930{
931    char libdir[PKG_PATH_MAX];
932    struct stat s, libStat;
933    int rc = 0;
934
935    const size_t libdirLen = strlen(dataDir) + strlen(PKG_LIB_POSTFIX);
936    if (libdirLen >= PKG_PATH_MAX) {
937        return -1;
938    }
939
940    if (snprintf(libdir, sizeof(libdir), "%s%s", dataDir, PKG_LIB_POSTFIX) != (ssize_t)libdirLen) {
941        LOGE("library dir not written successfully: %s\n", strerror(errno));
942        return -1;
943    }
944
945    if (stat(dataDir, &s) < 0) {
946        LOGE("couldn't state data dir");
947        return -1;
948    }
949
950    if (chown(dataDir, 0, 0) < 0) {
951        LOGE("failed to chown '%s': %s\n", dataDir, strerror(errno));
952        return -1;
953    }
954
955    if (chmod(dataDir, 0700) < 0) {
956        LOGE("failed to chmod '%s': %s\n", dataDir, strerror(errno));
957        rc = -1;
958        goto out;
959    }
960
961    if (lstat(libdir, &libStat) < 0) {
962        LOGE("couldn't stat lib dir: %s\n", strerror(errno));
963        rc = -1;
964        goto out;
965    }
966
967    if (S_ISDIR(libStat.st_mode)) {
968        if (delete_dir_contents(libdir, 1, 0) < 0) {
969            rc = -1;
970            goto out;
971        }
972    } else if (S_ISLNK(libStat.st_mode)) {
973        if (unlink(libdir) < 0) {
974            rc = -1;
975            goto out;
976        }
977    }
978
979    if (mkdir(libdir, 0755) < 0) {
980        LOGE("cannot create dir '%s': %s\n", libdir, strerror(errno));
981        rc = -errno;
982        goto out;
983    }
984
985    if (chown(libdir, AID_SYSTEM, AID_SYSTEM) < 0) {
986        LOGE("cannot chown dir '%s': %s\n", libdir, strerror(errno));
987        unlink(libdir);
988        rc = -errno;
989        goto out;
990    }
991
992out:
993    if (chmod(dataDir, s.st_mode) < 0) {
994        LOGE("failed to chmod '%s': %s\n", dataDir, strerror(errno));
995        return -1;
996    }
997
998    if (chown(dataDir, s.st_uid, s.st_gid) < 0) {
999        LOGE("failed to chown '%s' : %s\n", dataDir, strerror(errno));
1000        return -1;
1001    }
1002
1003    return rc;
1004}
1005