commands.c revision f68327e7e23d78e209acc76ccecbc4601e3f5fc2 
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)
82{
83    char pkgdir[PKG_PATH_MAX];
84
85    if (create_pkg_path(pkgdir, pkgname, PKG_DIR_POSTFIX, 0))
86        return -1;
87
88        /* delete contents AND directory, no exceptions */
89    return delete_dir_contents(pkgdir, 1, 0);
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)
110{
111    char pkgdir[PKG_PATH_MAX];
112
113    if (create_pkg_path(pkgdir, pkgname, PKG_DIR_POSTFIX, 0))
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 delete_cache(const char *pkgname)
121{
122    char cachedir[PKG_PATH_MAX];
123
124    if (create_pkg_path(cachedir, pkgname, CACHE_DIR_POSTFIX, 0))
125        return -1;
126
127        /* delete contents, not the directory, no exceptions */
128    return delete_dir_contents(cachedir, 0, 0);
129}
130
131static int64_t disk_free()
132{
133    struct statfs sfs;
134    if (statfs(android_data_dir.path, &sfs) == 0) {
135        return sfs.f_bavail * sfs.f_bsize;
136    } else {
137        LOGE("Couldn't statfs %s: %s\n", android_data_dir.path, strerror(errno));
138        return -1;
139    }
140}
141
142/* Try to ensure free_size bytes of storage are available.
143 * Returns 0 on success.
144 * This is rather simple-minded because doing a full LRU would
145 * be potentially memory-intensive, and without atime it would
146 * also require that apps constantly modify file metadata even
147 * when just reading from the cache, which is pretty awful.
148 */
149int free_cache(int64_t free_size)
150{
151    const char *name;
152    int dfd, subfd;
153    DIR *d;
154    struct dirent *de;
155    int64_t avail;
156
157    avail = disk_free();
158    if (avail < 0) return -1;
159
160    LOGI("free_cache(%" PRId64 ") avail %" PRId64 "\n", free_size, avail);
161    if (avail >= free_size) return 0;
162
163    d = opendir(android_data_dir.path);
164    if (d == NULL) {
165        LOGE("cannot open %s: %s\n", android_data_dir.path, strerror(errno));
166        return -1;
167    }
168    dfd = dirfd(d);
169
170    while ((de = readdir(d))) {
171        if (de->d_type != DT_DIR) continue;
172        name = de->d_name;
173
174        /* always skip "." and ".." */
175        if (name[0] == '.') {
176            if (name[1] == 0) continue;
177            if ((name[1] == '.') && (name[2] == 0)) continue;
178        }
179
180        subfd = openat(dfd, name, O_RDONLY | O_DIRECTORY);
181        if (subfd < 0) continue;
182
183        delete_dir_contents_fd(subfd, "cache");
184        close(subfd);
185
186        avail = disk_free();
187        if (avail >= free_size) {
188            closedir(d);
189            return 0;
190        }
191    }
192    closedir(d);
193
194    /* Fail case - not possible to free space */
195    return -1;
196}
197
198int move_dex(const char *src, const char *dst)
199{
200    char src_dex[PKG_PATH_MAX];
201    char dst_dex[PKG_PATH_MAX];
202
203    if (validate_apk_path(src)) return -1;
204    if (validate_apk_path(dst)) return -1;
205
206    if (create_cache_path(src_dex, src)) return -1;
207    if (create_cache_path(dst_dex, dst)) return -1;
208
209    LOGI("move %s -> %s\n", src_dex, dst_dex);
210    if (rename(src_dex, dst_dex) < 0) {
211        LOGE("Couldn't move %s: %s\n", src_dex, strerror(errno));
212        return -1;
213    } else {
214        return 0;
215    }
216}
217
218int rm_dex(const char *path)
219{
220    char dex_path[PKG_PATH_MAX];
221
222    if (validate_apk_path(path)) return -1;
223    if (create_cache_path(dex_path, path)) return -1;
224
225    LOGI("unlink %s\n", dex_path);
226    if (unlink(dex_path) < 0) {
227        LOGE("Couldn't unlink %s: %s\n", dex_path, strerror(errno));
228        return -1;
229    } else {
230        return 0;
231    }
232}
233
234int protect(char *pkgname, gid_t gid)
235{
236    struct stat s;
237    char pkgpath[PKG_PATH_MAX];
238
239    if (gid < AID_SYSTEM) return -1;
240
241    if (create_pkg_path_in_dir(pkgpath, &android_app_private_dir, pkgname, ".apk"))
242        return -1;
243
244    if (stat(pkgpath, &s) < 0) return -1;
245
246    if (chown(pkgpath, s.st_uid, gid) < 0) {
247        LOGE("failed to chgrp '%s': %s\n", pkgpath, strerror(errno));
248        return -1;
249    }
250
251    if (chmod(pkgpath, S_IRUSR|S_IWUSR|S_IRGRP) < 0) {
252        LOGE("failed to chmod '%s': %s\n", pkgpath, strerror(errno));
253        return -1;
254    }
255
256    return 0;
257}
258
259int get_size(const char *pkgname, const char *apkpath,
260             const char *fwdlock_apkpath,
261             int64_t *_codesize, int64_t *_datasize, int64_t *_cachesize)
262{
263    DIR *d;
264    int dfd;
265    struct dirent *de;
266    struct stat s;
267    char path[PKG_PATH_MAX];
268
269    int64_t codesize = 0;
270    int64_t datasize = 0;
271    int64_t cachesize = 0;
272
273        /* count the source apk as code -- but only if it's not
274         * on the /system partition and its not on the sdcard.
275         */
276    if (validate_system_app_path(apkpath) &&
277            strncmp(apkpath, android_asec_dir.path, android_asec_dir.len) != 0) {
278        if (stat(apkpath, &s) == 0) {
279            codesize += stat_size(&s);
280        }
281    }
282        /* count the forward locked apk as code if it is given
283         */
284    if (fwdlock_apkpath != NULL && fwdlock_apkpath[0] != '!') {
285        if (stat(fwdlock_apkpath, &s) == 0) {
286            codesize += stat_size(&s);
287        }
288    }
289        /* count the cached dexfile as code */
290    if (!create_cache_path(path, apkpath)) {
291        if (stat(path, &s) == 0) {
292            codesize += stat_size(&s);
293        }
294    }
295
296    if (create_pkg_path(path, pkgname, PKG_DIR_POSTFIX, 0)) {
297        goto done;
298    }
299
300    d = opendir(path);
301    if (d == NULL) {
302        goto done;
303    }
304    dfd = dirfd(d);
305
306    /* most stuff in the pkgdir is data, except for the "cache"
307     * directory and below, which is cache, and the "lib" directory
308     * and below, which is code...
309     */
310    while ((de = readdir(d))) {
311        const char *name = de->d_name;
312
313        if (de->d_type == DT_DIR) {
314            int subfd;
315                /* always skip "." and ".." */
316            if (name[0] == '.') {
317                if (name[1] == 0) continue;
318                if ((name[1] == '.') && (name[2] == 0)) continue;
319            }
320            subfd = openat(dfd, name, O_RDONLY | O_DIRECTORY);
321            if (subfd >= 0) {
322                int64_t size = calculate_dir_size(subfd);
323                if (!strcmp(name,"lib")) {
324                    codesize += size;
325                } else if(!strcmp(name,"cache")) {
326                    cachesize += size;
327                } else {
328                    datasize += size;
329                }
330            }
331        } else {
332            if (fstatat(dfd, name, &s, AT_SYMLINK_NOFOLLOW) == 0) {
333                datasize += stat_size(&s);
334            }
335        }
336    }
337    closedir(d);
338done:
339    *_codesize = codesize;
340    *_datasize = datasize;
341    *_cachesize = cachesize;
342    return 0;
343}
344
345
346/* a simpler version of dexOptGenerateCacheFileName() */
347int create_cache_path(char path[PKG_PATH_MAX], const char *src)
348{
349    char *tmp;
350    int srclen;
351    int dstlen;
352
353    srclen = strlen(src);
354
355        /* demand that we are an absolute path */
356    if ((src == 0) || (src[0] != '/') || strstr(src,"..")) {
357        return -1;
358    }
359
360    if (srclen > PKG_PATH_MAX) {        // XXX: PKG_NAME_MAX?
361        return -1;
362    }
363
364    dstlen = srclen + strlen(DALVIK_CACHE_PREFIX) +
365        strlen(DALVIK_CACHE_POSTFIX) + 1;
366
367    if (dstlen > PKG_PATH_MAX) {
368        return -1;
369    }
370
371    sprintf(path,"%s%s%s",
372            DALVIK_CACHE_PREFIX,
373            src + 1, /* skip the leading / */
374            DALVIK_CACHE_POSTFIX);
375
376    for(tmp = path + strlen(DALVIK_CACHE_PREFIX); *tmp; tmp++) {
377        if (*tmp == '/') {
378            *tmp = '@';
379        }
380    }
381
382    return 0;
383}
384
385static void run_dexopt(int zip_fd, int odex_fd, const char* input_file_name,
386    const char* dexopt_flags)
387{
388    static const char* DEX_OPT_BIN = "/system/bin/dexopt";
389    static const int MAX_INT_LEN = 12;      // '-'+10dig+'\0' -OR- 0x+8dig
390    char zip_num[MAX_INT_LEN];
391    char odex_num[MAX_INT_LEN];
392
393    sprintf(zip_num, "%d", zip_fd);
394    sprintf(odex_num, "%d", odex_fd);
395
396    execl(DEX_OPT_BIN, DEX_OPT_BIN, "--zip", zip_num, odex_num, input_file_name,
397        dexopt_flags, (char*) NULL);
398    LOGE("execl(%s) failed: %s\n", DEX_OPT_BIN, strerror(errno));
399}
400
401static int wait_dexopt(pid_t pid, const char* apk_path)
402{
403    int status;
404    pid_t got_pid;
405
406    /*
407     * Wait for the optimization process to finish.
408     */
409    while (1) {
410        got_pid = waitpid(pid, &status, 0);
411        if (got_pid == -1 && errno == EINTR) {
412            printf("waitpid interrupted, retrying\n");
413        } else {
414            break;
415        }
416    }
417    if (got_pid != pid) {
418        LOGW("waitpid failed: wanted %d, got %d: %s\n",
419            (int) pid, (int) got_pid, strerror(errno));
420        return 1;
421    }
422
423    if (WIFEXITED(status) && WEXITSTATUS(status) == 0) {
424        LOGD("DexInv: --- END '%s' (success) ---\n", apk_path);
425        return 0;
426    } else {
427        LOGW("DexInv: --- END '%s' --- status=0x%04x, process failed\n",
428            apk_path, status);
429        return status;      /* always nonzero */
430    }
431}
432
433int dexopt(const char *apk_path, uid_t uid, int is_public)
434{
435    struct utimbuf ut;
436    struct stat apk_stat, dex_stat;
437    char dex_path[PKG_PATH_MAX];
438    char dexopt_flags[PROPERTY_VALUE_MAX];
439    char *end;
440    int res, zip_fd=-1, odex_fd=-1;
441
442        /* Before anything else: is there a .odex file?  If so, we have
443         * pre-optimized the apk and there is nothing to do here.
444         */
445    if (strlen(apk_path) >= (PKG_PATH_MAX - 8)) {
446        return -1;
447    }
448
449    /* platform-specific flags affecting optimization and verification */
450    property_get("dalvik.vm.dexopt-flags", dexopt_flags, "");
451
452    strcpy(dex_path, apk_path);
453    end = strrchr(dex_path, '.');
454    if (end != NULL) {
455        strcpy(end, ".odex");
456        if (stat(dex_path, &dex_stat) == 0) {
457            return 0;
458        }
459    }
460
461    if (create_cache_path(dex_path, apk_path)) {
462        return -1;
463    }
464
465    memset(&apk_stat, 0, sizeof(apk_stat));
466    stat(apk_path, &apk_stat);
467
468    zip_fd = open(apk_path, O_RDONLY, 0);
469    if (zip_fd < 0) {
470        LOGE("dexopt cannot open '%s' for input\n", apk_path);
471        return -1;
472    }
473
474    unlink(dex_path);
475    odex_fd = open(dex_path, O_RDWR | O_CREAT | O_EXCL, 0644);
476    if (odex_fd < 0) {
477        LOGE("dexopt cannot open '%s' for output\n", dex_path);
478        goto fail;
479    }
480    if (fchown(odex_fd, AID_SYSTEM, uid) < 0) {
481        LOGE("dexopt cannot chown '%s'\n", dex_path);
482        goto fail;
483    }
484    if (fchmod(odex_fd,
485               S_IRUSR|S_IWUSR|S_IRGRP |
486               (is_public ? S_IROTH : 0)) < 0) {
487        LOGE("dexopt cannot chmod '%s'\n", dex_path);
488        goto fail;
489    }
490
491    LOGD("DexInv: --- BEGIN '%s' ---\n", apk_path);
492
493    pid_t pid;
494    pid = fork();
495    if (pid == 0) {
496        /* child -- drop privileges before continuing */
497        if (setgid(uid) != 0) {
498            LOGE("setgid(%d) failed during dexopt\n", uid);
499            exit(64);
500        }
501        if (setuid(uid) != 0) {
502            LOGE("setuid(%d) during dexopt\n", uid);
503            exit(65);
504        }
505        if (flock(odex_fd, LOCK_EX | LOCK_NB) != 0) {
506            LOGE("flock(%s) failed: %s\n", dex_path, strerror(errno));
507            exit(66);
508        }
509
510        run_dexopt(zip_fd, odex_fd, apk_path, dexopt_flags);
511        exit(67);   /* only get here on exec failure */
512    } else {
513        res = wait_dexopt(pid, apk_path);
514        if (res != 0) {
515            LOGE("dexopt failed on '%s' res = %d\n", dex_path, res);
516            goto fail;
517        }
518    }
519
520    ut.actime = apk_stat.st_atime;
521    ut.modtime = apk_stat.st_mtime;
522    utime(dex_path, &ut);
523
524    close(odex_fd);
525    close(zip_fd);
526    return 0;
527
528fail:
529    if (odex_fd >= 0) {
530        close(odex_fd);
531        unlink(dex_path);
532    }
533    if (zip_fd >= 0) {
534        close(zip_fd);
535    }
536    return -1;
537}
538
539int create_move_path(char path[PKG_PATH_MAX],
540    const char* pkgname,
541    const char* leaf,
542    uid_t persona)
543{
544    if ((android_data_dir.len + strlen(pkgname) + strlen(leaf) + 1) >= PKG_PATH_MAX) {
545        return -1;
546    }
547
548    sprintf(path, "%s%s%s/%s", android_data_dir.path, PRIMARY_USER_PREFIX, pkgname, leaf);
549    return 0;
550}
551
552void mkinnerdirs(char* path, int basepos, mode_t mode, int uid, int gid,
553        struct stat* statbuf)
554{
555    while (path[basepos] != 0) {
556        if (path[basepos] == '/') {
557            path[basepos] = 0;
558            if (lstat(path, statbuf) < 0) {
559                LOGI("Making directory: %s\n", path);
560                if (mkdir(path, mode) == 0) {
561                    chown(path, uid, gid);
562                } else {
563                    LOGW("Unable to make directory %s: %s\n", path, strerror(errno));
564                }
565            }
566            path[basepos] = '/';
567            basepos++;
568        }
569        basepos++;
570    }
571}
572
573int movefileordir(char* srcpath, char* dstpath, int dstbasepos,
574        int dstuid, int dstgid, struct stat* statbuf)
575{
576    DIR *d;
577    struct dirent *de;
578    int res;
579
580    int srcend = strlen(srcpath);
581    int dstend = strlen(dstpath);
582
583    if (lstat(srcpath, statbuf) < 0) {
584        LOGW("Unable to stat %s: %s\n", srcpath, strerror(errno));
585        return 1;
586    }
587
588    if ((statbuf->st_mode&S_IFDIR) == 0) {
589        mkinnerdirs(dstpath, dstbasepos, S_IRWXU|S_IRWXG|S_IXOTH,
590                dstuid, dstgid, statbuf);
591        LOGI("Renaming %s to %s (uid %d)\n", srcpath, dstpath, dstuid);
592        if (rename(srcpath, dstpath) >= 0) {
593            if (chown(dstpath, dstuid, dstgid) < 0) {
594                LOGE("cannot chown %s: %s\n", dstpath, strerror(errno));
595                unlink(dstpath);
596                return 1;
597            }
598        } else {
599            LOGW("Unable to rename %s to %s: %s\n",
600                srcpath, dstpath, strerror(errno));
601            return 1;
602        }
603        return 0;
604    }
605
606    d = opendir(srcpath);
607    if (d == NULL) {
608        LOGW("Unable to opendir %s: %s\n", srcpath, strerror(errno));
609        return 1;
610    }
611
612    res = 0;
613
614    while ((de = readdir(d))) {
615        const char *name = de->d_name;
616            /* always skip "." and ".." */
617        if (name[0] == '.') {
618            if (name[1] == 0) continue;
619            if ((name[1] == '.') && (name[2] == 0)) continue;
620        }
621
622        if ((srcend+strlen(name)) >= (PKG_PATH_MAX-2)) {
623            LOGW("Source path too long; skipping: %s/%s\n", srcpath, name);
624            continue;
625        }
626
627        if ((dstend+strlen(name)) >= (PKG_PATH_MAX-2)) {
628            LOGW("Destination path too long; skipping: %s/%s\n", dstpath, name);
629            continue;
630        }
631
632        srcpath[srcend] = dstpath[dstend] = '/';
633        strcpy(srcpath+srcend+1, name);
634        strcpy(dstpath+dstend+1, name);
635
636        if (movefileordir(srcpath, dstpath, dstbasepos, dstuid, dstgid, statbuf) != 0) {
637            res = 1;
638        }
639
640        // Note: we will be leaving empty directories behind in srcpath,
641        // but that is okay, the package manager will be erasing all of the
642        // data associated with .apks that disappear.
643
644        srcpath[srcend] = dstpath[dstend] = 0;
645    }
646
647    closedir(d);
648    return res;
649}
650
651int movefiles()
652{
653    DIR *d;
654    int dfd, subfd;
655    struct dirent *de;
656    struct stat s;
657    char buf[PKG_PATH_MAX+1];
658    int bufp, bufe, bufi, readlen;
659
660    char srcpkg[PKG_NAME_MAX];
661    char dstpkg[PKG_NAME_MAX];
662    char srcpath[PKG_PATH_MAX];
663    char dstpath[PKG_PATH_MAX];
664    int dstuid=-1, dstgid=-1;
665    int hasspace;
666
667    d = opendir(UPDATE_COMMANDS_DIR_PREFIX);
668    if (d == NULL) {
669        goto done;
670    }
671    dfd = dirfd(d);
672
673        /* Iterate through all files in the directory, executing the
674         * file movements requested there-in.
675         */
676    while ((de = readdir(d))) {
677        const char *name = de->d_name;
678
679        if (de->d_type == DT_DIR) {
680            continue;
681        } else {
682            subfd = openat(dfd, name, O_RDONLY);
683            if (subfd < 0) {
684                LOGW("Unable to open update commands at %s%s\n",
685                        UPDATE_COMMANDS_DIR_PREFIX, name);
686                continue;
687            }
688
689            bufp = 0;
690            bufe = 0;
691            buf[PKG_PATH_MAX] = 0;
692            srcpkg[0] = dstpkg[0] = 0;
693            while (1) {
694                bufi = bufp;
695                while (bufi < bufe && buf[bufi] != '\n') {
696                    bufi++;
697                }
698                if (bufi < bufe) {
699                    buf[bufi] = 0;
700                    LOGV("Processing line: %s\n", buf+bufp);
701                    hasspace = 0;
702                    while (bufp < bufi && isspace(buf[bufp])) {
703                        hasspace = 1;
704                        bufp++;
705                    }
706                    if (buf[bufp] == '#' || bufp == bufi) {
707                        // skip comments and empty lines.
708                    } else if (hasspace) {
709                        if (dstpkg[0] == 0) {
710                            LOGW("Path before package line in %s%s: %s\n",
711                                    UPDATE_COMMANDS_DIR_PREFIX, name, buf+bufp);
712                        } else if (srcpkg[0] == 0) {
713                            // Skip -- source package no longer exists.
714                        } else {
715                            LOGV("Move file: %s (from %s to %s)\n", buf+bufp, srcpkg, dstpkg);
716                            if (!create_move_path(srcpath, srcpkg, buf+bufp, 0) &&
717                                    !create_move_path(dstpath, dstpkg, buf+bufp, 0)) {
718                                movefileordir(srcpath, dstpath,
719                                        strlen(dstpath)-strlen(buf+bufp),
720                                        dstuid, dstgid, &s);
721                            }
722                        }
723                    } else {
724                        char* div = strchr(buf+bufp, ':');
725                        if (div == NULL) {
726                            LOGW("Bad package spec in %s%s; no ':' sep: %s\n",
727                                    UPDATE_COMMANDS_DIR_PREFIX, name, buf+bufp);
728                        } else {
729                            *div = 0;
730                            div++;
731                            if (strlen(buf+bufp) < PKG_NAME_MAX) {
732                                strcpy(dstpkg, buf+bufp);
733                            } else {
734                                srcpkg[0] = dstpkg[0] = 0;
735                                LOGW("Package name too long in %s%s: %s\n",
736                                        UPDATE_COMMANDS_DIR_PREFIX, name, buf+bufp);
737                            }
738                            if (strlen(div) < PKG_NAME_MAX) {
739                                strcpy(srcpkg, div);
740                            } else {
741                                srcpkg[0] = dstpkg[0] = 0;
742                                LOGW("Package name too long in %s%s: %s\n",
743                                        UPDATE_COMMANDS_DIR_PREFIX, name, div);
744                            }
745                            if (srcpkg[0] != 0) {
746                                if (!create_pkg_path(srcpath, srcpkg, PKG_DIR_POSTFIX, 0)) {
747                                    if (lstat(srcpath, &s) < 0) {
748                                        // Package no longer exists -- skip.
749                                        srcpkg[0] = 0;
750                                    }
751                                } else {
752                                    srcpkg[0] = 0;
753                                    LOGW("Can't create path %s in %s%s\n",
754                                            div, UPDATE_COMMANDS_DIR_PREFIX, name);
755                                }
756                                if (srcpkg[0] != 0) {
757                                    if (!create_pkg_path(dstpath, dstpkg, PKG_DIR_POSTFIX, 0)) {
758                                        if (lstat(dstpath, &s) == 0) {
759                                            dstuid = s.st_uid;
760                                            dstgid = s.st_gid;
761                                        } else {
762                                            // Destination package doesn't
763                                            // exist...  due to original-package,
764                                            // this is normal, so don't be
765                                            // noisy about it.
766                                            srcpkg[0] = 0;
767                                        }
768                                    } else {
769                                        srcpkg[0] = 0;
770                                        LOGW("Can't create path %s in %s%s\n",
771                                                div, UPDATE_COMMANDS_DIR_PREFIX, name);
772                                    }
773                                }
774                                LOGV("Transfering from %s to %s: uid=%d\n",
775                                    srcpkg, dstpkg, dstuid);
776                            }
777                        }
778                    }
779                    bufp = bufi+1;
780                } else {
781                    if (bufp == 0) {
782                        if (bufp < bufe) {
783                            LOGW("Line too long in %s%s, skipping: %s\n",
784                                    UPDATE_COMMANDS_DIR_PREFIX, name, buf);
785                        }
786                    } else if (bufp < bufe) {
787                        memcpy(buf, buf+bufp, bufe-bufp);
788                        bufe -= bufp;
789                        bufp = 0;
790                    }
791                    readlen = read(subfd, buf+bufe, PKG_PATH_MAX-bufe);
792                    if (readlen < 0) {
793                        LOGW("Failure reading update commands in %s%s: %s\n",
794                                UPDATE_COMMANDS_DIR_PREFIX, name, strerror(errno));
795                        break;
796                    } else if (readlen == 0) {
797                        break;
798                    }
799                    bufe += readlen;
800                    buf[bufe] = 0;
801                    LOGV("Read buf: %s\n", buf);
802                }
803            }
804            close(subfd);
805        }
806    }
807    closedir(d);
808done:
809    return 0;
810}
811
812int linklib(const char* dataDir, const char* asecLibDir)
813{
814    char libdir[PKG_PATH_MAX];
815    struct stat s, libStat;
816    int rc = 0;
817
818    const size_t libdirLen = strlen(dataDir) + strlen(PKG_LIB_POSTFIX);
819    if (libdirLen >= PKG_PATH_MAX) {
820        LOGE("library dir len too large");
821        return -1;
822    }
823
824    if (snprintf(libdir, sizeof(libdir), "%s%s", dataDir, PKG_LIB_POSTFIX) != (ssize_t)libdirLen) {
825        LOGE("library dir not written successfully: %s\n", strerror(errno));
826        return -1;
827    }
828
829    if (stat(dataDir, &s) < 0) return -1;
830
831    if (chown(dataDir, 0, 0) < 0) {
832        LOGE("failed to chown '%s': %s\n", dataDir, strerror(errno));
833        return -1;
834    }
835
836    if (chmod(dataDir, 0700) < 0) {
837        LOGE("failed to chmod '%s': %s\n", dataDir, strerror(errno));
838        rc = -1;
839        goto out;
840    }
841
842    if (lstat(libdir, &libStat) < 0) {
843        LOGE("couldn't stat lib dir: %s\n", strerror(errno));
844        rc = -1;
845        goto out;
846    }
847
848    if (S_ISDIR(libStat.st_mode)) {
849        if (delete_dir_contents(libdir, 1, 0) < 0) {
850            rc = -1;
851            goto out;
852        }
853    } else if (S_ISLNK(libStat.st_mode)) {
854        if (unlink(libdir) < 0) {
855            rc = -1;
856            goto out;
857        }
858    }
859
860    if (symlink(asecLibDir, libdir) < 0) {
861        LOGE("couldn't symlink directory '%s' -> '%s': %s\n", libdir, asecLibDir, strerror(errno));
862        rc = -errno;
863        goto out;
864    }
865
866    if (lchown(libdir, AID_SYSTEM, AID_SYSTEM) < 0) {
867        LOGE("cannot chown dir '%s': %s\n", libdir, strerror(errno));
868        unlink(libdir);
869        rc = -errno;
870        goto out;
871    }
872
873out:
874    if (chmod(dataDir, s.st_mode) < 0) {
875        LOGE("failed to chmod '%s': %s\n", dataDir, strerror(errno));
876        return -errno;
877    }
878
879    if (chown(dataDir, s.st_uid, s.st_gid) < 0) {
880        LOGE("failed to chown '%s' : %s\n", dataDir, strerror(errno));
881        return -errno;
882    }
883
884    return rc;
885}
886
887int unlinklib(const char* dataDir)
888{
889    char libdir[PKG_PATH_MAX];
890    struct stat s, libStat;
891    int rc = 0;
892
893    const size_t libdirLen = strlen(dataDir) + strlen(PKG_LIB_POSTFIX);
894    if (libdirLen >= PKG_PATH_MAX) {
895        return -1;
896    }
897
898    if (snprintf(libdir, sizeof(libdir), "%s%s", dataDir, PKG_LIB_POSTFIX) != (ssize_t)libdirLen) {
899        LOGE("library dir not written successfully: %s\n", strerror(errno));
900        return -1;
901    }
902
903    if (stat(dataDir, &s) < 0) {
904        LOGE("couldn't state data dir");
905        return -1;
906    }
907
908    if (chown(dataDir, 0, 0) < 0) {
909        LOGE("failed to chown '%s': %s\n", dataDir, strerror(errno));
910        return -1;
911    }
912
913    if (chmod(dataDir, 0700) < 0) {
914        LOGE("failed to chmod '%s': %s\n", dataDir, strerror(errno));
915        rc = -1;
916        goto out;
917    }
918
919    if (lstat(libdir, &libStat) < 0) {
920        LOGE("couldn't stat lib dir: %s\n", strerror(errno));
921        rc = -1;
922        goto out;
923    }
924
925    if (S_ISDIR(libStat.st_mode)) {
926        if (delete_dir_contents(libdir, 1, 0) < 0) {
927            rc = -1;
928            goto out;
929        }
930    } else if (S_ISLNK(libStat.st_mode)) {
931        if (unlink(libdir) < 0) {
932            rc = -1;
933            goto out;
934        }
935    }
936
937    if (mkdir(libdir, 0755) < 0) {
938        LOGE("cannot create dir '%s': %s\n", libdir, strerror(errno));
939        rc = -errno;
940        goto out;
941    }
942
943    if (chown(libdir, AID_SYSTEM, AID_SYSTEM) < 0) {
944        LOGE("cannot chown dir '%s': %s\n", libdir, strerror(errno));
945        unlink(libdir);
946        rc = -errno;
947        goto out;
948    }
949
950out:
951    if (chmod(dataDir, s.st_mode) < 0) {
952        LOGE("failed to chmod '%s': %s\n", dataDir, strerror(errno));
953        return -1;
954    }
955
956    if (chown(dataDir, s.st_uid, s.st_gid) < 0) {
957        LOGE("failed to chown '%s' : %s\n", dataDir, strerror(errno));
958        return -1;
959    }
960
961    return rc;
962}
963