commands.c revision 86c9584559439504fc57ece2ccd9b6cbd568430c 
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 (chown(pkgdir, uid, gid) < 0) {
52        LOGE("cannot chown dir '%s': %s\n", pkgdir, strerror(errno));
53        unlink(pkgdir);
54        return -errno;
55    }
56    if (mkdir(libdir, 0755) < 0) {
57        LOGE("cannot create dir '%s': %s\n", libdir, strerror(errno));
58        unlink(pkgdir);
59        return -errno;
60    }
61    if (chown(libdir, AID_SYSTEM, AID_SYSTEM) < 0) {
62        LOGE("cannot chown dir '%s': %s\n", libdir, strerror(errno));
63        unlink(libdir);
64        unlink(pkgdir);
65        return -errno;
66    }
67    return 0;
68}
69
70int uninstall(const char *pkgname)
71{
72    char pkgdir[PKG_PATH_MAX];
73
74    if (create_pkg_path(pkgdir, pkgname, PKG_DIR_POSTFIX, 0))
75        return -1;
76
77        /* delete contents AND directory, no exceptions */
78    return delete_dir_contents(pkgdir, 1, 0);
79}
80
81int renamepkg(const char *oldpkgname, const char *newpkgname)
82{
83    char oldpkgdir[PKG_PATH_MAX];
84    char newpkgdir[PKG_PATH_MAX];
85
86    if (create_pkg_path(oldpkgdir, oldpkgname, PKG_DIR_POSTFIX, 0))
87        return -1;
88    if (create_pkg_path(newpkgdir, newpkgname, PKG_DIR_POSTFIX, 0))
89        return -1;
90
91    if (rename(oldpkgdir, newpkgdir) < 0) {
92        LOGE("cannot rename dir '%s' to '%s': %s\n", oldpkgdir, newpkgdir, strerror(errno));
93        return -errno;
94    }
95    return 0;
96}
97
98int delete_user_data(const char *pkgname)
99{
100    char pkgdir[PKG_PATH_MAX];
101
102    if (create_pkg_path(pkgdir, pkgname, PKG_DIR_POSTFIX, 0))
103        return -1;
104
105        /* delete contents, excluding "lib", but not the directory itself */
106    return delete_dir_contents(pkgdir, 0, "lib");
107}
108
109int delete_cache(const char *pkgname)
110{
111    char cachedir[PKG_PATH_MAX];
112
113    if (create_pkg_path(cachedir, pkgname, CACHE_DIR_POSTFIX, 0))
114        return -1;
115
116        /* delete contents, not the directory, no exceptions */
117    return delete_dir_contents(cachedir, 0, 0);
118}
119
120static int64_t disk_free()
121{
122    struct statfs sfs;
123    if (statfs(android_data_dir.path, &sfs) == 0) {
124        return sfs.f_bavail * sfs.f_bsize;
125    } else {
126        LOGE("Couldn't statfs %s: %s\n", android_data_dir.path, strerror(errno));
127        return -1;
128    }
129}
130
131/* Try to ensure free_size bytes of storage are available.
132 * Returns 0 on success.
133 * This is rather simple-minded because doing a full LRU would
134 * be potentially memory-intensive, and without atime it would
135 * also require that apps constantly modify file metadata even
136 * when just reading from the cache, which is pretty awful.
137 */
138int free_cache(int64_t free_size)
139{
140    const char *name;
141    int dfd, subfd;
142    DIR *d;
143    struct dirent *de;
144    int64_t avail;
145
146    avail = disk_free();
147    if (avail < 0) return -1;
148
149    LOGI("free_cache(%" PRId64 ") avail %" PRId64 "\n", free_size, avail);
150    if (avail >= free_size) return 0;
151
152    d = opendir(android_data_dir.path);
153    if (d == NULL) {
154        LOGE("cannot open %s: %s\n", android_data_dir.path, strerror(errno));
155        return -1;
156    }
157    dfd = dirfd(d);
158
159    while ((de = readdir(d))) {
160        if (de->d_type != DT_DIR) continue;
161        name = de->d_name;
162
163        /* always skip "." and ".." */
164        if (name[0] == '.') {
165            if (name[1] == 0) continue;
166            if ((name[1] == '.') && (name[2] == 0)) continue;
167        }
168
169        subfd = openat(dfd, name, O_RDONLY | O_DIRECTORY);
170        if (subfd < 0) continue;
171
172        delete_dir_contents_fd(subfd, "cache");
173        close(subfd);
174
175        avail = disk_free();
176        if (avail >= free_size) {
177            closedir(d);
178            return 0;
179        }
180    }
181    closedir(d);
182
183    /* Fail case - not possible to free space */
184    return -1;
185}
186
187int move_dex(const char *src, const char *dst)
188{
189    char src_dex[PKG_PATH_MAX];
190    char dst_dex[PKG_PATH_MAX];
191
192    if (validate_apk_path(src)) return -1;
193    if (validate_apk_path(dst)) return -1;
194
195    if (create_cache_path(src_dex, src)) return -1;
196    if (create_cache_path(dst_dex, dst)) return -1;
197
198    LOGI("move %s -> %s\n", src_dex, dst_dex);
199    if (rename(src_dex, dst_dex) < 0) {
200        LOGE("Couldn't move %s: %s\n", src_dex, strerror(errno));
201        return -1;
202    } else {
203        return 0;
204    }
205}
206
207int rm_dex(const char *path)
208{
209    char dex_path[PKG_PATH_MAX];
210
211    if (validate_apk_path(path)) return -1;
212    if (create_cache_path(dex_path, path)) return -1;
213
214    LOGI("unlink %s\n", dex_path);
215    if (unlink(dex_path) < 0) {
216        LOGE("Couldn't unlink %s: %s\n", dex_path, strerror(errno));
217        return -1;
218    } else {
219        return 0;
220    }
221}
222
223int protect(char *pkgname, gid_t gid)
224{
225    struct stat s;
226    char pkgpath[PKG_PATH_MAX];
227
228    if (gid < AID_SYSTEM) return -1;
229
230    if (create_pkg_path_in_dir(pkgpath, &android_app_private_dir, pkgname, ".apk"))
231        return -1;
232
233    if (stat(pkgpath, &s) < 0) return -1;
234
235    if (chown(pkgpath, s.st_uid, gid) < 0) {
236        LOGE("failed to chgrp '%s': %s\n", pkgpath, strerror(errno));
237        return -1;
238    }
239
240    if (chmod(pkgpath, S_IRUSR|S_IWUSR|S_IRGRP) < 0) {
241        LOGE("failed to chmod '%s': %s\n", pkgpath, strerror(errno));
242        return -1;
243    }
244
245    return 0;
246}
247
248int get_size(const char *pkgname, const char *apkpath,
249             const char *fwdlock_apkpath,
250             int64_t *_codesize, int64_t *_datasize, int64_t *_cachesize)
251{
252    DIR *d;
253    int dfd;
254    struct dirent *de;
255    struct stat s;
256    char path[PKG_PATH_MAX];
257
258    int64_t codesize = 0;
259    int64_t datasize = 0;
260    int64_t cachesize = 0;
261
262        /* count the source apk as code -- but only if it's not
263         * on the /system partition and its not on the sdcard.
264         */
265    if (validate_system_app_path(apkpath) &&
266            strncmp(apkpath, android_asec_dir.path, android_asec_dir.len) != 0) {
267        if (stat(apkpath, &s) == 0) {
268            codesize += stat_size(&s);
269        }
270    }
271        /* count the forward locked apk as code if it is given
272         */
273    if (fwdlock_apkpath != NULL && fwdlock_apkpath[0] != '!') {
274        if (stat(fwdlock_apkpath, &s) == 0) {
275            codesize += stat_size(&s);
276        }
277    }
278        /* count the cached dexfile as code */
279    if (!create_cache_path(path, apkpath)) {
280        if (stat(path, &s) == 0) {
281            codesize += stat_size(&s);
282        }
283    }
284
285    if (create_pkg_path(path, pkgname, PKG_DIR_POSTFIX, 0)) {
286        goto done;
287    }
288
289    d = opendir(path);
290    if (d == NULL) {
291        goto done;
292    }
293    dfd = dirfd(d);
294
295    /* most stuff in the pkgdir is data, except for the "cache"
296     * directory and below, which is cache, and the "lib" directory
297     * and below, which is code...
298     */
299    while ((de = readdir(d))) {
300        const char *name = de->d_name;
301
302        if (de->d_type == DT_DIR) {
303            int subfd;
304                /* always skip "." and ".." */
305            if (name[0] == '.') {
306                if (name[1] == 0) continue;
307                if ((name[1] == '.') && (name[2] == 0)) continue;
308            }
309            subfd = openat(dfd, name, O_RDONLY | O_DIRECTORY);
310            if (subfd >= 0) {
311                int64_t size = calculate_dir_size(subfd);
312                if (!strcmp(name,"lib")) {
313                    codesize += size;
314                } else if(!strcmp(name,"cache")) {
315                    cachesize += size;
316                } else {
317                    datasize += size;
318                }
319            }
320        } else {
321            if (fstatat(dfd, name, &s, AT_SYMLINK_NOFOLLOW) == 0) {
322                datasize += stat_size(&s);
323            }
324        }
325    }
326    closedir(d);
327done:
328    *_codesize = codesize;
329    *_datasize = datasize;
330    *_cachesize = cachesize;
331    return 0;
332}
333
334
335/* a simpler version of dexOptGenerateCacheFileName() */
336int create_cache_path(char path[PKG_PATH_MAX], const char *src)
337{
338    char *tmp;
339    int srclen;
340    int dstlen;
341
342    srclen = strlen(src);
343
344        /* demand that we are an absolute path */
345    if ((src == 0) || (src[0] != '/') || strstr(src,"..")) {
346        return -1;
347    }
348
349    if (srclen > PKG_PATH_MAX) {        // XXX: PKG_NAME_MAX?
350        return -1;
351    }
352
353    dstlen = srclen + strlen(DALVIK_CACHE_PREFIX) +
354        strlen(DALVIK_CACHE_POSTFIX) + 1;
355
356    if (dstlen > PKG_PATH_MAX) {
357        return -1;
358    }
359
360    sprintf(path,"%s%s%s",
361            DALVIK_CACHE_PREFIX,
362            src + 1, /* skip the leading / */
363            DALVIK_CACHE_POSTFIX);
364
365    for(tmp = path + strlen(DALVIK_CACHE_PREFIX); *tmp; tmp++) {
366        if (*tmp == '/') {
367            *tmp = '@';
368        }
369    }
370
371    return 0;
372}
373
374static void run_dexopt(int zip_fd, int odex_fd, const char* input_file_name,
375    const char* dexopt_flags)
376{
377    static const char* DEX_OPT_BIN = "/system/bin/dexopt";
378    static const int MAX_INT_LEN = 12;      // '-'+10dig+'\0' -OR- 0x+8dig
379    char zip_num[MAX_INT_LEN];
380    char odex_num[MAX_INT_LEN];
381
382    sprintf(zip_num, "%d", zip_fd);
383    sprintf(odex_num, "%d", odex_fd);
384
385    execl(DEX_OPT_BIN, DEX_OPT_BIN, "--zip", zip_num, odex_num, input_file_name,
386        dexopt_flags, (char*) NULL);
387    LOGE("execl(%s) failed: %s\n", DEX_OPT_BIN, strerror(errno));
388}
389
390static int wait_dexopt(pid_t pid, const char* apk_path)
391{
392    int status;
393    pid_t got_pid;
394
395    /*
396     * Wait for the optimization process to finish.
397     */
398    while (1) {
399        got_pid = waitpid(pid, &status, 0);
400        if (got_pid == -1 && errno == EINTR) {
401            printf("waitpid interrupted, retrying\n");
402        } else {
403            break;
404        }
405    }
406    if (got_pid != pid) {
407        LOGW("waitpid failed: wanted %d, got %d: %s\n",
408            (int) pid, (int) got_pid, strerror(errno));
409        return 1;
410    }
411
412    if (WIFEXITED(status) && WEXITSTATUS(status) == 0) {
413        LOGD("DexInv: --- END '%s' (success) ---\n", apk_path);
414        return 0;
415    } else {
416        LOGW("DexInv: --- END '%s' --- status=0x%04x, process failed\n",
417            apk_path, status);
418        return status;      /* always nonzero */
419    }
420}
421
422int dexopt(const char *apk_path, uid_t uid, int is_public)
423{
424    struct utimbuf ut;
425    struct stat apk_stat, dex_stat;
426    char dex_path[PKG_PATH_MAX];
427    char dexopt_flags[PROPERTY_VALUE_MAX];
428    char *end;
429    int res, zip_fd=-1, odex_fd=-1;
430
431        /* Before anything else: is there a .odex file?  If so, we have
432         * pre-optimized the apk and there is nothing to do here.
433         */
434    if (strlen(apk_path) >= (PKG_PATH_MAX - 8)) {
435        return -1;
436    }
437
438    /* platform-specific flags affecting optimization and verification */
439    property_get("dalvik.vm.dexopt-flags", dexopt_flags, "");
440
441    strcpy(dex_path, apk_path);
442    end = strrchr(dex_path, '.');
443    if (end != NULL) {
444        strcpy(end, ".odex");
445        if (stat(dex_path, &dex_stat) == 0) {
446            return 0;
447        }
448    }
449
450    if (create_cache_path(dex_path, apk_path)) {
451        return -1;
452    }
453
454    memset(&apk_stat, 0, sizeof(apk_stat));
455    stat(apk_path, &apk_stat);
456
457    zip_fd = open(apk_path, O_RDONLY, 0);
458    if (zip_fd < 0) {
459        LOGE("dexopt cannot open '%s' for input\n", apk_path);
460        return -1;
461    }
462
463    unlink(dex_path);
464    odex_fd = open(dex_path, O_RDWR | O_CREAT | O_EXCL, 0644);
465    if (odex_fd < 0) {
466        LOGE("dexopt cannot open '%s' for output\n", dex_path);
467        goto fail;
468    }
469    if (fchown(odex_fd, AID_SYSTEM, uid) < 0) {
470        LOGE("dexopt cannot chown '%s'\n", dex_path);
471        goto fail;
472    }
473    if (fchmod(odex_fd,
474               S_IRUSR|S_IWUSR|S_IRGRP |
475               (is_public ? S_IROTH : 0)) < 0) {
476        LOGE("dexopt cannot chmod '%s'\n", dex_path);
477        goto fail;
478    }
479
480    LOGD("DexInv: --- BEGIN '%s' ---\n", apk_path);
481
482    pid_t pid;
483    pid = fork();
484    if (pid == 0) {
485        /* child -- drop privileges before continuing */
486        if (setgid(uid) != 0) {
487            LOGE("setgid(%d) failed during dexopt\n", uid);
488            exit(64);
489        }
490        if (setuid(uid) != 0) {
491            LOGE("setuid(%d) during dexopt\n", uid);
492            exit(65);
493        }
494        if (flock(odex_fd, LOCK_EX | LOCK_NB) != 0) {
495            LOGE("flock(%s) failed: %s\n", dex_path, strerror(errno));
496            exit(66);
497        }
498
499        run_dexopt(zip_fd, odex_fd, apk_path, dexopt_flags);
500        exit(67);   /* only get here on exec failure */
501    } else {
502        res = wait_dexopt(pid, apk_path);
503        if (res != 0) {
504            LOGE("dexopt failed on '%s' res = %d\n", dex_path, res);
505            goto fail;
506        }
507    }
508
509    ut.actime = apk_stat.st_atime;
510    ut.modtime = apk_stat.st_mtime;
511    utime(dex_path, &ut);
512
513    close(odex_fd);
514    close(zip_fd);
515    return 0;
516
517fail:
518    if (odex_fd >= 0) {
519        close(odex_fd);
520        unlink(dex_path);
521    }
522    if (zip_fd >= 0) {
523        close(zip_fd);
524    }
525    return -1;
526}
527
528int create_move_path(char path[PKG_PATH_MAX],
529    const char* pkgname,
530    const char* leaf,
531    uid_t persona)
532{
533    if ((android_data_dir.len + strlen(pkgname) + strlen(leaf) + 1) >= PKG_PATH_MAX) {
534        return -1;
535    }
536
537    sprintf(path, "%s%s%s/%s", android_data_dir.path, PRIMARY_USER_PREFIX, pkgname, leaf);
538    return 0;
539}
540
541void mkinnerdirs(char* path, int basepos, mode_t mode, int uid, int gid,
542        struct stat* statbuf)
543{
544    while (path[basepos] != 0) {
545        if (path[basepos] == '/') {
546            path[basepos] = 0;
547            if (lstat(path, statbuf) < 0) {
548                LOGI("Making directory: %s\n", path);
549                if (mkdir(path, mode) == 0) {
550                    chown(path, uid, gid);
551                } else {
552                    LOGW("Unable to make directory %s: %s\n", path, strerror(errno));
553                }
554            }
555            path[basepos] = '/';
556            basepos++;
557        }
558        basepos++;
559    }
560}
561
562int movefileordir(char* srcpath, char* dstpath, int dstbasepos,
563        int dstuid, int dstgid, struct stat* statbuf)
564{
565    DIR *d;
566    struct dirent *de;
567    int res;
568
569    int srcend = strlen(srcpath);
570    int dstend = strlen(dstpath);
571
572    if (lstat(srcpath, statbuf) < 0) {
573        LOGW("Unable to stat %s: %s\n", srcpath, strerror(errno));
574        return 1;
575    }
576
577    if ((statbuf->st_mode&S_IFDIR) == 0) {
578        mkinnerdirs(dstpath, dstbasepos, S_IRWXU|S_IRWXG|S_IXOTH,
579                dstuid, dstgid, statbuf);
580        LOGI("Renaming %s to %s (uid %d)\n", srcpath, dstpath, dstuid);
581        if (rename(srcpath, dstpath) >= 0) {
582            if (chown(dstpath, dstuid, dstgid) < 0) {
583                LOGE("cannot chown %s: %s\n", dstpath, strerror(errno));
584                unlink(dstpath);
585                return 1;
586            }
587        } else {
588            LOGW("Unable to rename %s to %s: %s\n",
589                srcpath, dstpath, strerror(errno));
590            return 1;
591        }
592        return 0;
593    }
594
595    d = opendir(srcpath);
596    if (d == NULL) {
597        LOGW("Unable to opendir %s: %s\n", srcpath, strerror(errno));
598        return 1;
599    }
600
601    res = 0;
602
603    while ((de = readdir(d))) {
604        const char *name = de->d_name;
605            /* always skip "." and ".." */
606        if (name[0] == '.') {
607            if (name[1] == 0) continue;
608            if ((name[1] == '.') && (name[2] == 0)) continue;
609        }
610
611        if ((srcend+strlen(name)) >= (PKG_PATH_MAX-2)) {
612            LOGW("Source path too long; skipping: %s/%s\n", srcpath, name);
613            continue;
614        }
615
616        if ((dstend+strlen(name)) >= (PKG_PATH_MAX-2)) {
617            LOGW("Destination path too long; skipping: %s/%s\n", dstpath, name);
618            continue;
619        }
620
621        srcpath[srcend] = dstpath[dstend] = '/';
622        strcpy(srcpath+srcend+1, name);
623        strcpy(dstpath+dstend+1, name);
624
625        if (movefileordir(srcpath, dstpath, dstbasepos, dstuid, dstgid, statbuf) != 0) {
626            res = 1;
627        }
628
629        // Note: we will be leaving empty directories behind in srcpath,
630        // but that is okay, the package manager will be erasing all of the
631        // data associated with .apks that disappear.
632
633        srcpath[srcend] = dstpath[dstend] = 0;
634    }
635
636    closedir(d);
637    return res;
638}
639
640int movefiles()
641{
642    DIR *d;
643    int dfd, subfd;
644    struct dirent *de;
645    struct stat s;
646    char buf[PKG_PATH_MAX+1];
647    int bufp, bufe, bufi, readlen;
648
649    char srcpkg[PKG_NAME_MAX];
650    char dstpkg[PKG_NAME_MAX];
651    char srcpath[PKG_PATH_MAX];
652    char dstpath[PKG_PATH_MAX];
653    int dstuid=-1, dstgid=-1;
654    int hasspace;
655
656    d = opendir(UPDATE_COMMANDS_DIR_PREFIX);
657    if (d == NULL) {
658        goto done;
659    }
660    dfd = dirfd(d);
661
662        /* Iterate through all files in the directory, executing the
663         * file movements requested there-in.
664         */
665    while ((de = readdir(d))) {
666        const char *name = de->d_name;
667
668        if (de->d_type == DT_DIR) {
669            continue;
670        } else {
671            subfd = openat(dfd, name, O_RDONLY);
672            if (subfd < 0) {
673                LOGW("Unable to open update commands at %s%s\n",
674                        UPDATE_COMMANDS_DIR_PREFIX, name);
675                continue;
676            }
677
678            bufp = 0;
679            bufe = 0;
680            buf[PKG_PATH_MAX] = 0;
681            srcpkg[0] = dstpkg[0] = 0;
682            while (1) {
683                bufi = bufp;
684                while (bufi < bufe && buf[bufi] != '\n') {
685                    bufi++;
686                }
687                if (bufi < bufe) {
688                    buf[bufi] = 0;
689                    LOGV("Processing line: %s\n", buf+bufp);
690                    hasspace = 0;
691                    while (bufp < bufi && isspace(buf[bufp])) {
692                        hasspace = 1;
693                        bufp++;
694                    }
695                    if (buf[bufp] == '#' || bufp == bufi) {
696                        // skip comments and empty lines.
697                    } else if (hasspace) {
698                        if (dstpkg[0] == 0) {
699                            LOGW("Path before package line in %s%s: %s\n",
700                                    UPDATE_COMMANDS_DIR_PREFIX, name, buf+bufp);
701                        } else if (srcpkg[0] == 0) {
702                            // Skip -- source package no longer exists.
703                        } else {
704                            LOGV("Move file: %s (from %s to %s)\n", buf+bufp, srcpkg, dstpkg);
705                            if (!create_move_path(srcpath, srcpkg, buf+bufp, 0) &&
706                                    !create_move_path(dstpath, dstpkg, buf+bufp, 0)) {
707                                movefileordir(srcpath, dstpath,
708                                        strlen(dstpath)-strlen(buf+bufp),
709                                        dstuid, dstgid, &s);
710                            }
711                        }
712                    } else {
713                        char* div = strchr(buf+bufp, ':');
714                        if (div == NULL) {
715                            LOGW("Bad package spec in %s%s; no ':' sep: %s\n",
716                                    UPDATE_COMMANDS_DIR_PREFIX, name, buf+bufp);
717                        } else {
718                            *div = 0;
719                            div++;
720                            if (strlen(buf+bufp) < PKG_NAME_MAX) {
721                                strcpy(dstpkg, buf+bufp);
722                            } else {
723                                srcpkg[0] = dstpkg[0] = 0;
724                                LOGW("Package name too long in %s%s: %s\n",
725                                        UPDATE_COMMANDS_DIR_PREFIX, name, buf+bufp);
726                            }
727                            if (strlen(div) < PKG_NAME_MAX) {
728                                strcpy(srcpkg, div);
729                            } else {
730                                srcpkg[0] = dstpkg[0] = 0;
731                                LOGW("Package name too long in %s%s: %s\n",
732                                        UPDATE_COMMANDS_DIR_PREFIX, name, div);
733                            }
734                            if (srcpkg[0] != 0) {
735                                if (!create_pkg_path(srcpath, srcpkg, PKG_DIR_POSTFIX, 0)) {
736                                    if (lstat(srcpath, &s) < 0) {
737                                        // Package no longer exists -- skip.
738                                        srcpkg[0] = 0;
739                                    }
740                                } else {
741                                    srcpkg[0] = 0;
742                                    LOGW("Can't create path %s in %s%s\n",
743                                            div, UPDATE_COMMANDS_DIR_PREFIX, name);
744                                }
745                                if (srcpkg[0] != 0) {
746                                    if (!create_pkg_path(dstpath, dstpkg, PKG_DIR_POSTFIX, 0)) {
747                                        if (lstat(dstpath, &s) == 0) {
748                                            dstuid = s.st_uid;
749                                            dstgid = s.st_gid;
750                                        } else {
751                                            // Destination package doesn't
752                                            // exist...  due to original-package,
753                                            // this is normal, so don't be
754                                            // noisy about it.
755                                            srcpkg[0] = 0;
756                                        }
757                                    } else {
758                                        srcpkg[0] = 0;
759                                        LOGW("Can't create path %s in %s%s\n",
760                                                div, UPDATE_COMMANDS_DIR_PREFIX, name);
761                                    }
762                                }
763                                LOGV("Transfering from %s to %s: uid=%d\n",
764                                    srcpkg, dstpkg, dstuid);
765                            }
766                        }
767                    }
768                    bufp = bufi+1;
769                } else {
770                    if (bufp == 0) {
771                        if (bufp < bufe) {
772                            LOGW("Line too long in %s%s, skipping: %s\n",
773                                    UPDATE_COMMANDS_DIR_PREFIX, name, buf);
774                        }
775                    } else if (bufp < bufe) {
776                        memcpy(buf, buf+bufp, bufe-bufp);
777                        bufe -= bufp;
778                        bufp = 0;
779                    }
780                    readlen = read(subfd, buf+bufe, PKG_PATH_MAX-bufe);
781                    if (readlen < 0) {
782                        LOGW("Failure reading update commands in %s%s: %s\n",
783                                UPDATE_COMMANDS_DIR_PREFIX, name, strerror(errno));
784                        break;
785                    } else if (readlen == 0) {
786                        break;
787                    }
788                    bufe += readlen;
789                    buf[bufe] = 0;
790                    LOGV("Read buf: %s\n", buf);
791                }
792            }
793            close(subfd);
794        }
795    }
796    closedir(d);
797done:
798    return 0;
799}
800
801int linklib(const char* dataDir, const char* asecLibDir)
802{
803    char libdir[PKG_PATH_MAX];
804    struct stat s, libStat;
805    int rc = 0;
806
807    const size_t libdirLen = strlen(dataDir) + strlen(PKG_LIB_POSTFIX);
808    if (libdirLen >= PKG_PATH_MAX) {
809        LOGE("library dir len too large");
810        return -1;
811    }
812
813    if (snprintf(libdir, sizeof(libdir), "%s%s", dataDir, PKG_LIB_POSTFIX) != (ssize_t)libdirLen) {
814        LOGE("library dir not written successfully: %s\n", strerror(errno));
815        return -1;
816    }
817
818    if (stat(dataDir, &s) < 0) return -1;
819
820    if (chown(dataDir, 0, 0) < 0) {
821        LOGE("failed to chown '%s': %s\n", dataDir, strerror(errno));
822        return -1;
823    }
824
825    if (chmod(dataDir, 0700) < 0) {
826        LOGE("failed to chmod '%s': %s\n", dataDir, strerror(errno));
827        rc = -1;
828        goto out;
829    }
830
831    if (lstat(libdir, &libStat) < 0) {
832        LOGE("couldn't stat lib dir: %s\n", strerror(errno));
833        rc = -1;
834        goto out;
835    }
836
837    if (S_ISDIR(libStat.st_mode)) {
838        if (delete_dir_contents(libdir, 1, 0) < 0) {
839            rc = -1;
840            goto out;
841        }
842    } else if (S_ISLNK(libStat.st_mode)) {
843        if (unlink(libdir) < 0) {
844            rc = -1;
845            goto out;
846        }
847    }
848
849    if (symlink(asecLibDir, libdir) < 0) {
850        LOGE("couldn't symlink directory '%s' -> '%s': %s\n", libdir, asecLibDir, strerror(errno));
851        rc = -errno;
852        goto out;
853    }
854
855    if (lchown(libdir, AID_SYSTEM, AID_SYSTEM) < 0) {
856        LOGE("cannot chown dir '%s': %s\n", libdir, strerror(errno));
857        unlink(libdir);
858        rc = -errno;
859        goto out;
860    }
861
862out:
863    if (chmod(dataDir, s.st_mode) < 0) {
864        LOGE("failed to chmod '%s': %s\n", dataDir, strerror(errno));
865        return -errno;
866    }
867
868    if (chown(dataDir, s.st_uid, s.st_gid) < 0) {
869        LOGE("failed to chown '%s' : %s\n", dataDir, strerror(errno));
870        return -errno;
871    }
872
873    return rc;
874}
875
876int unlinklib(const char* dataDir)
877{
878    char libdir[PKG_PATH_MAX];
879    struct stat s, libStat;
880    int rc = 0;
881
882    const size_t libdirLen = strlen(dataDir) + strlen(PKG_LIB_POSTFIX);
883    if (libdirLen >= PKG_PATH_MAX) {
884        return -1;
885    }
886
887    if (snprintf(libdir, sizeof(libdir), "%s%s", dataDir, PKG_LIB_POSTFIX) != (ssize_t)libdirLen) {
888        LOGE("library dir not written successfully: %s\n", strerror(errno));
889        return -1;
890    }
891
892    if (stat(dataDir, &s) < 0) {
893        LOGE("couldn't state data dir");
894        return -1;
895    }
896
897    if (chown(dataDir, 0, 0) < 0) {
898        LOGE("failed to chown '%s': %s\n", dataDir, strerror(errno));
899        return -1;
900    }
901
902    if (chmod(dataDir, 0700) < 0) {
903        LOGE("failed to chmod '%s': %s\n", dataDir, strerror(errno));
904        rc = -1;
905        goto out;
906    }
907
908    if (lstat(libdir, &libStat) < 0) {
909        LOGE("couldn't stat lib dir: %s\n", strerror(errno));
910        rc = -1;
911        goto out;
912    }
913
914    if (S_ISDIR(libStat.st_mode)) {
915        if (delete_dir_contents(libdir, 1, 0) < 0) {
916            rc = -1;
917            goto out;
918        }
919    } else if (S_ISLNK(libStat.st_mode)) {
920        if (unlink(libdir) < 0) {
921            rc = -1;
922            goto out;
923        }
924    }
925
926    if (mkdir(libdir, 0755) < 0) {
927        LOGE("cannot create dir '%s': %s\n", libdir, strerror(errno));
928        rc = -errno;
929        goto out;
930    }
931
932    if (chown(libdir, AID_SYSTEM, AID_SYSTEM) < 0) {
933        LOGE("cannot chown dir '%s': %s\n", libdir, strerror(errno));
934        unlink(libdir);
935        rc = -errno;
936        goto out;
937    }
938
939out:
940    if (chmod(dataDir, s.st_mode) < 0) {
941        LOGE("failed to chmod '%s': %s\n", dataDir, strerror(errno));
942        return -1;
943    }
944
945    if (chown(dataDir, s.st_uid, s.st_gid) < 0) {
946        LOGE("failed to chown '%s' : %s\n", dataDir, strerror(errno));
947        return -1;
948    }
949
950    return rc;
951}
952