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      1 /*
      2 **
      3 ** Copyright 2008, The Android Open Source Project
      4 **
      5 ** Licensed under the Apache License, Version 2.0 (the "License");
      6 ** you may not use this file except in compliance with the License.
      7 ** You may obtain a copy of the License at
      8 **
      9 **     http://www.apache.org/licenses/LICENSE-2.0
     10 **
     11 ** Unless required by applicable law or agreed to in writing, software
     12 ** distributed under the License is distributed on an "AS IS" BASIS,
     13 ** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     14 ** See the License for the specific language governing permissions and
     15 ** limitations under the License.
     16 */
     17 
     18 #define LOG_TAG "installd"
     19 
     20 #include <stdio.h>
     21 #include <stdlib.h>
     22 #include <stdint.h>
     23 #include <inttypes.h>
     24 #include <sys/stat.h>
     25 #include <dirent.h>
     26 #include <unistd.h>
     27 #include <ctype.h>
     28 #include <fcntl.h>
     29 #include <errno.h>
     30 #include <utime.h>
     31 #include <sys/socket.h>
     32 #include <sys/types.h>
     33 #include <sys/wait.h>
     34 
     35 #include <cutils/fs.h>
     36 #include <cutils/sockets.h>
     37 #include <cutils/log.h>
     38 #include <cutils/properties.h>
     39 #include <cutils/multiuser.h>
     40 
     41 #include <private/android_filesystem_config.h>
     42 
     43 #if INCLUDE_SYS_MOUNT_FOR_STATFS
     44 #include <sys/mount.h>
     45 #else
     46 #include <sys/statfs.h>
     47 #endif
     48 
     49 #define SOCKET_PATH "installd"
     50 
     51 
     52 /* elements combined with a valid package name to form paths */
     53 
     54 #define PRIMARY_USER_PREFIX    "data/"
     55 #define SECONDARY_USER_PREFIX  "user/"
     56 
     57 #define PKG_DIR_POSTFIX        ""
     58 
     59 #define PKG_LIB_POSTFIX        "/lib"
     60 
     61 #define CACHE_DIR_POSTFIX      "/cache"
     62 
     63 #define APP_SUBDIR             "app/" // sub-directory under ANDROID_DATA
     64 
     65 #define APP_LIB_SUBDIR         "app-lib/" // sub-directory under ANDROID_DATA
     66 
     67 #define MEDIA_SUBDIR           "media/" // sub-directory under ANDROID_DATA
     68 
     69 /* other handy constants */
     70 
     71 #define PRIVATE_APP_SUBDIR     "app-private/" // sub-directory under ANDROID_DATA
     72 
     73 #define DALVIK_CACHE_PREFIX    "/data/dalvik-cache/"
     74 #define DALVIK_CACHE_POSTFIX   "/classes.dex"
     75 
     76 #define UPDATE_COMMANDS_DIR_PREFIX  "/system/etc/updatecmds/"
     77 
     78 #define PKG_NAME_MAX  128   /* largest allowed package name */
     79 #define PKG_PATH_MAX  256   /* max size of any path we use */
     80 
     81 #define PER_USER_RANGE ((uid_t)100000)   /* range of uids per user
     82                                             uid = persona * PER_USER_RANGE + appid */
     83 
     84 /* data structures */
     85 
     86 typedef struct {
     87     char* path;
     88     size_t len;
     89 } dir_rec_t;
     90 
     91 typedef struct {
     92     size_t count;
     93     dir_rec_t* dirs;
     94 } dir_rec_array_t;
     95 
     96 extern dir_rec_t android_app_dir;
     97 extern dir_rec_t android_app_private_dir;
     98 extern dir_rec_t android_app_lib_dir;
     99 extern dir_rec_t android_data_dir;
    100 extern dir_rec_t android_asec_dir;
    101 extern dir_rec_t android_media_dir;
    102 extern dir_rec_array_t android_system_dirs;
    103 
    104 typedef struct cache_dir_struct {
    105     struct cache_dir_struct* parent;
    106     int32_t childCount;
    107     int32_t hiddenCount;
    108     int32_t deleted;
    109     char name[];
    110 } cache_dir_t;
    111 
    112 typedef struct {
    113     cache_dir_t* dir;
    114     time_t modTime;
    115     char name[];
    116 } cache_file_t;
    117 
    118 typedef struct {
    119     size_t numDirs;
    120     size_t availDirs;
    121     cache_dir_t** dirs;
    122     size_t numFiles;
    123     size_t availFiles;
    124     cache_file_t** files;
    125     size_t numCollected;
    126     void* memBlocks;
    127     int8_t* curMemBlockAvail;
    128     int8_t* curMemBlockEnd;
    129 } cache_t;
    130 
    131 /* util.c */
    132 
    133 int create_pkg_path_in_dir(char path[PKG_PATH_MAX],
    134                                 const dir_rec_t* dir,
    135                                 const char* pkgname,
    136                                 const char* postfix);
    137 
    138 int create_pkg_path(char path[PKG_PATH_MAX],
    139                     const char *pkgname,
    140                     const char *postfix,
    141                     uid_t persona);
    142 
    143 int create_persona_path(char path[PKG_PATH_MAX],
    144                     uid_t persona);
    145 
    146 int create_persona_media_path(char path[PKG_PATH_MAX], userid_t userid);
    147 
    148 int create_move_path(char path[PKG_PATH_MAX],
    149                      const char* pkgname,
    150                      const char* leaf,
    151                      uid_t persona);
    152 
    153 int is_valid_package_name(const char* pkgname);
    154 
    155 int create_cache_path(char path[PKG_PATH_MAX], const char *src);
    156 
    157 int delete_dir_contents(const char *pathname,
    158                         int also_delete_dir,
    159                         const char *ignore);
    160 
    161 int delete_dir_contents_fd(int dfd, const char *name);
    162 
    163 int lookup_media_dir(char basepath[PATH_MAX], const char *dir);
    164 
    165 int64_t data_disk_free();
    166 
    167 cache_t* start_cache_collection();
    168 
    169 void add_cache_files(cache_t* cache, const char *basepath, const char *cachedir);
    170 
    171 void clear_cache_files(cache_t* cache, int64_t free_size);
    172 
    173 void finish_cache_collection(cache_t* cache);
    174 
    175 int validate_system_app_path(const char* path);
    176 
    177 int get_path_from_env(dir_rec_t* rec, const char* var);
    178 
    179 int get_path_from_string(dir_rec_t* rec, const char* path);
    180 
    181 int copy_and_append(dir_rec_t* dst, const dir_rec_t* src, const char* suffix);
    182 
    183 int validate_apk_path(const char *path);
    184 
    185 int append_and_increment(char** dst, const char* src, size_t* dst_size);
    186 
    187 char *build_string2(char *s1, char *s2);
    188 char *build_string3(char *s1, char *s2, char *s3);
    189 
    190 int ensure_dir(const char* path, mode_t mode, uid_t uid, gid_t gid);
    191 int ensure_media_user_dirs(userid_t userid);
    192 
    193 /* commands.c */
    194 
    195 int install(const char *pkgname, uid_t uid, gid_t gid, const char *seinfo);
    196 int uninstall(const char *pkgname, uid_t persona);
    197 int renamepkg(const char *oldpkgname, const char *newpkgname);
    198 int fix_uid(const char *pkgname, uid_t uid, gid_t gid);
    199 int delete_user_data(const char *pkgname, uid_t persona);
    200 int make_user_data(const char *pkgname, uid_t uid, uid_t persona);
    201 int delete_persona(uid_t persona);
    202 int delete_cache(const char *pkgname, uid_t persona);
    203 int move_dex(const char *src, const char *dst);
    204 int rm_dex(const char *path);
    205 int protect(char *pkgname, gid_t gid);
    206 int get_size(const char *pkgname, int persona, const char *apkpath, const char *libdirpath,
    207              const char *fwdlock_apkpath, const char *asecpath, int64_t *codesize,
    208              int64_t *datasize, int64_t *cachesize, int64_t *asecsize);
    209 int free_cache(int64_t free_size);
    210 int dexopt(const char *apk_path, uid_t uid, int is_public);
    211 int movefiles();
    212 int linklib(const char* target, const char* source, int userId);
    213