installd.c revision 7ac3ed1d7679e9cb90b44c6ab1629318b17c0690 
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
19
20#define BUFFER_MAX    1024  /* input buffer for commands */
21#define TOKEN_MAX     8     /* max number of arguments in buffer */
22#define REPLY_MAX     256   /* largest reply allowed */
23
24static int do_ping(char **arg, char reply[REPLY_MAX])
25{
26    return 0;
27}
28
29static int do_install(char **arg, char reply[REPLY_MAX])
30{
31    return install(arg[0], atoi(arg[1]), atoi(arg[2])); /* pkgname, uid, gid */
32}
33
34static int do_dexopt(char **arg, char reply[REPLY_MAX])
35{
36        /* apk_path, uid, is_public */
37    return dexopt(arg[0], atoi(arg[1]), atoi(arg[2]));
38}
39
40static int do_move_dex(char **arg, char reply[REPLY_MAX])
41{
42    return move_dex(arg[0], arg[1]); /* src, dst */
43}
44
45static int do_rm_dex(char **arg, char reply[REPLY_MAX])
46{
47    return rm_dex(arg[0]); /* pkgname */
48}
49
50static int do_remove(char **arg, char reply[REPLY_MAX])
51{
52    return uninstall(arg[0], atoi(arg[1])); /* pkgname, userid */
53}
54
55static int do_rename(char **arg, char reply[REPLY_MAX])
56{
57    return renamepkg(arg[0], arg[1]); /* oldpkgname, newpkgname */
58}
59
60static int do_free_cache(char **arg, char reply[REPLY_MAX]) /* TODO int:free_size */
61{
62    return free_cache((int64_t)atoll(arg[0])); /* free_size */
63}
64
65static int do_rm_cache(char **arg, char reply[REPLY_MAX])
66{
67    return delete_cache(arg[0]); /* pkgname */
68}
69
70static int do_protect(char **arg, char reply[REPLY_MAX])
71{
72    return protect(arg[0], atoi(arg[1])); /* pkgname, gid */
73}
74
75static int do_get_size(char **arg, char reply[REPLY_MAX])
76{
77    int64_t codesize = 0;
78    int64_t datasize = 0;
79    int64_t cachesize = 0;
80    int64_t asecsize = 0;
81    int res = 0;
82
83        /* pkgdir, apkpath */
84    res = get_size(arg[0], arg[1], arg[2], arg[3], &codesize, &datasize, &cachesize, &asecsize);
85
86    /*
87     * Each int64_t can take up 22 characters printed out. Make sure it
88     * doesn't go over REPLY_MAX in the future.
89     */
90    snprintf(reply, REPLY_MAX, "%" PRId64 " %" PRId64 " %" PRId64 " %" PRId64,
91            codesize, datasize, cachesize, asecsize);
92    return res;
93}
94
95static int do_rm_user_data(char **arg, char reply[REPLY_MAX])
96{
97    return delete_user_data(arg[0], atoi(arg[1])); /* pkgname, userid */
98}
99
100static int do_mk_user_data(char **arg, char reply[REPLY_MAX])
101{
102    return make_user_data(arg[0], atoi(arg[1]), atoi(arg[2])); /* pkgname, uid, userid */
103}
104
105static int do_rm_user(char **arg, char reply[REPLY_MAX])
106{
107    return delete_persona(atoi(arg[0])); /* userid */
108}
109
110static int do_clone_user_data(char **arg, char reply[REPLY_MAX])
111{
112    return clone_persona_data(atoi(arg[0]), atoi(arg[1]), atoi(arg[2]));
113}
114
115static int do_movefiles(char **arg, char reply[REPLY_MAX])
116{
117    return movefiles();
118}
119
120static int do_linklib(char **arg, char reply[REPLY_MAX])
121{
122    return linklib(arg[0], arg[1]);
123}
124
125static int do_unlinklib(char **arg, char reply[REPLY_MAX])
126{
127    return unlinklib(arg[0]);
128}
129
130struct cmdinfo {
131    const char *name;
132    unsigned numargs;
133    int (*func)(char **arg, char reply[REPLY_MAX]);
134};
135
136struct cmdinfo cmds[] = {
137    { "ping",                 0, do_ping },
138    { "install",              3, do_install },
139    { "dexopt",               3, do_dexopt },
140    { "movedex",              2, do_move_dex },
141    { "rmdex",                1, do_rm_dex },
142    { "remove",               2, do_remove },
143    { "rename",               2, do_rename },
144    { "freecache",            1, do_free_cache },
145    { "rmcache",              1, do_rm_cache },
146    { "protect",              2, do_protect },
147    { "getsize",              4, do_get_size },
148    { "rmuserdata",           2, do_rm_user_data },
149    { "movefiles",            0, do_movefiles },
150    { "linklib",              2, do_linklib },
151    { "unlinklib",            1, do_unlinklib },
152    { "mkuserdata",           3, do_mk_user_data },
153    { "rmuser",               1, do_rm_user },
154    { "cloneuserdata",        3, do_clone_user_data },
155};
156
157static int readx(int s, void *_buf, int count)
158{
159    char *buf = _buf;
160    int n = 0, r;
161    if (count < 0) return -1;
162    while (n < count) {
163        r = read(s, buf + n, count - n);
164        if (r < 0) {
165            if (errno == EINTR) continue;
166            ALOGE("read error: %s\n", strerror(errno));
167            return -1;
168        }
169        if (r == 0) {
170            ALOGE("eof\n");
171            return -1; /* EOF */
172        }
173        n += r;
174    }
175    return 0;
176}
177
178static int writex(int s, const void *_buf, int count)
179{
180    const char *buf = _buf;
181    int n = 0, r;
182    if (count < 0) return -1;
183    while (n < count) {
184        r = write(s, buf + n, count - n);
185        if (r < 0) {
186            if (errno == EINTR) continue;
187            ALOGE("write error: %s\n", strerror(errno));
188            return -1;
189        }
190        n += r;
191    }
192    return 0;
193}
194
195
196/* Tokenize the command buffer, locate a matching command,
197 * ensure that the required number of arguments are provided,
198 * call the function(), return the result.
199 */
200static int execute(int s, char cmd[BUFFER_MAX])
201{
202    char reply[REPLY_MAX];
203    char *arg[TOKEN_MAX+1];
204    unsigned i;
205    unsigned n = 0;
206    unsigned short count;
207    int ret = -1;
208
209//    ALOGI("execute('%s')\n", cmd);
210
211        /* default reply is "" */
212    reply[0] = 0;
213
214        /* n is number of args (not counting arg[0]) */
215    arg[0] = cmd;
216    while (*cmd) {
217        if (isspace(*cmd)) {
218            *cmd++ = 0;
219            n++;
220            arg[n] = cmd;
221            if (n == TOKEN_MAX) {
222                ALOGE("too many arguments\n");
223                goto done;
224            }
225        }
226        cmd++;
227    }
228
229    for (i = 0; i < sizeof(cmds) / sizeof(cmds[0]); i++) {
230        if (!strcmp(cmds[i].name,arg[0])) {
231            if (n != cmds[i].numargs) {
232                ALOGE("%s requires %d arguments (%d given)\n",
233                     cmds[i].name, cmds[i].numargs, n);
234            } else {
235                ret = cmds[i].func(arg + 1, reply);
236            }
237            goto done;
238        }
239    }
240    ALOGE("unsupported command '%s'\n", arg[0]);
241
242done:
243    if (reply[0]) {
244        n = snprintf(cmd, BUFFER_MAX, "%d %s", ret, reply);
245    } else {
246        n = snprintf(cmd, BUFFER_MAX, "%d", ret);
247    }
248    if (n > BUFFER_MAX) n = BUFFER_MAX;
249    count = n;
250
251//    ALOGI("reply: '%s'\n", cmd);
252    if (writex(s, &count, sizeof(count))) return -1;
253    if (writex(s, cmd, count)) return -1;
254    return 0;
255}
256
257/**
258 * Initialize all the global variables that are used elsewhere. Returns 0 upon
259 * success and -1 on error.
260 */
261void free_globals() {
262    size_t i;
263
264    for (i = 0; i < android_system_dirs.count; i++) {
265        if (android_system_dirs.dirs[i].path != NULL) {
266            free(android_system_dirs.dirs[i].path);
267        }
268    }
269
270    free(android_system_dirs.dirs);
271}
272
273int initialize_globals() {
274    // Get the android data directory.
275    if (get_path_from_env(&android_data_dir, "ANDROID_DATA") < 0) {
276        return -1;
277    }
278
279    // Get the android app directory.
280    if (copy_and_append(&android_app_dir, &android_data_dir, APP_SUBDIR) < 0) {
281        return -1;
282    }
283
284    // Get the android protected app directory.
285    if (copy_and_append(&android_app_private_dir, &android_data_dir, PRIVATE_APP_SUBDIR) < 0) {
286        return -1;
287    }
288
289    // Get the sd-card ASEC mount point.
290    if (get_path_from_env(&android_asec_dir, "ASEC_MOUNTPOINT") < 0) {
291        return -1;
292    }
293
294    // Take note of the system and vendor directories.
295    android_system_dirs.count = 2;
296
297    android_system_dirs.dirs = calloc(android_system_dirs.count, sizeof(dir_rec_t));
298    if (android_system_dirs.dirs == NULL) {
299        ALOGE("Couldn't allocate array for dirs; aborting\n");
300        return -1;
301    }
302
303    // system
304    if (get_path_from_env(&android_system_dirs.dirs[0], "ANDROID_ROOT") < 0) {
305        free_globals();
306        return -1;
307    }
308
309    // append "app/" to dirs[0]
310    char *system_app_path = build_string2(android_system_dirs.dirs[0].path, APP_SUBDIR);
311    android_system_dirs.dirs[0].path = system_app_path;
312    android_system_dirs.dirs[0].len = strlen(system_app_path);
313
314    // vendor
315    // TODO replace this with an environment variable (doesn't exist yet)
316    android_system_dirs.dirs[1].path = "/vendor/app/";
317    android_system_dirs.dirs[1].len = strlen(android_system_dirs.dirs[1].path);
318
319    return 0;
320}
321
322int initialize_directories() {
323    // /data/user
324    char *user_data_dir = build_string2(android_data_dir.path, SECONDARY_USER_PREFIX);
325    // /data/data
326    char *legacy_data_dir = build_string2(android_data_dir.path, PRIMARY_USER_PREFIX);
327    // /data/user/0
328    char *primary_data_dir = build_string3(android_data_dir.path, SECONDARY_USER_PREFIX,
329            "0");
330    int ret = -1;
331    if (user_data_dir != NULL && primary_data_dir != NULL && legacy_data_dir != NULL) {
332        ret = 0;
333        // Make the /data/user directory if necessary
334        if (access(user_data_dir, R_OK) < 0) {
335            if (mkdir(user_data_dir, 0711) < 0) {
336                return -1;
337            }
338            if (chown(user_data_dir, AID_SYSTEM, AID_SYSTEM) < 0) {
339                return -1;
340            }
341            if (chmod(user_data_dir, 0711) < 0) {
342                return -1;
343            }
344        }
345        // Make the /data/user/0 symlink to /data/data if necessary
346        if (access(primary_data_dir, R_OK) < 0) {
347              ret = symlink(legacy_data_dir, primary_data_dir);
348        }
349        free(user_data_dir);
350        free(legacy_data_dir);
351        free(primary_data_dir);
352    }
353    return ret;
354}
355
356int main(const int argc, const char *argv[]) {
357    char buf[BUFFER_MAX];
358    struct sockaddr addr;
359    socklen_t alen;
360    int lsocket, s, count;
361
362    if (initialize_globals() < 0) {
363        ALOGE("Could not initialize globals; exiting.\n");
364        exit(1);
365    }
366
367    if (initialize_directories() < 0) {
368        ALOGE("Could not create directories; exiting.\n");
369        exit(1);
370    }
371
372    lsocket = android_get_control_socket(SOCKET_PATH);
373    if (lsocket < 0) {
374        ALOGE("Failed to get socket from environment: %s\n", strerror(errno));
375        exit(1);
376    }
377    if (listen(lsocket, 5)) {
378        ALOGE("Listen on socket failed: %s\n", strerror(errno));
379        exit(1);
380    }
381    fcntl(lsocket, F_SETFD, FD_CLOEXEC);
382
383    for (;;) {
384        alen = sizeof(addr);
385        s = accept(lsocket, &addr, &alen);
386        if (s < 0) {
387            ALOGE("Accept failed: %s\n", strerror(errno));
388            continue;
389        }
390        fcntl(s, F_SETFD, FD_CLOEXEC);
391
392        ALOGI("new connection\n");
393        for (;;) {
394            unsigned short count;
395            if (readx(s, &count, sizeof(count))) {
396                ALOGE("failed to read size\n");
397                break;
398            }
399            if ((count < 1) || (count >= BUFFER_MAX)) {
400                ALOGE("invalid size %d\n", count);
401                break;
402            }
403            if (readx(s, buf, count)) {
404                ALOGE("failed to read command\n");
405                break;
406            }
407            buf[count] = 0;
408            if (execute(s, buf)) break;
409        }
410        ALOGI("closing connection\n");
411        close(s);
412    }
413
414    return 0;
415}
416