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Handle naming for system uids running as secondary users

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Allow naming such as u1_system, u2_radio, u2_media.
Forward and reverse mapping for the above.

(cherry-pick of c60a0027b1ef3bc4929d2023e7083fbce12fafe7.)

Change-Id: I46eeb23fee4f57b2907640570504123d3ce99985
This commit is contained in:
Amith Yamasani 2012-08-12 19:51:34 -07:00 committed by Elliott Hughes
parent 440e417d5f
commit bf9441efb8
1 changed files with 35 additions and 11 deletions
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46
libc/bionic/stubs.c
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@ -245,31 +245,43 @@ android_name_to_group( struct group *gr, const char *name )
return NULL;
}
/* translate a user/group name like app_1234 into the
* corresponding user/group id (AID_APP + 1234)
/* translate a user/group name to the corresponding user/group id.
* u0_a1234 -> 0 * AID_USER + AID_APP + 1234
* u2_i1000 -> 2 * AID_USER + AID_ISOLATED_START + 1000
* u1_system -> 1 * AID_USER + android_ids['system']
* returns 0 and sets errno to ENOENT in case of error
*/
static unsigned
app_id_from_name( const char* name )
{
unsigned long userid;
unsigned long appid;
unsigned long appid = 0;
char* end;
if (name[0] != 'u' || !isdigit(name[1]))
goto FAIL;
userid = strtoul(name+1, &end, 10);
if (end[0] != '_' || end[1] == 0 || !isdigit(end[2]))
if (end[0] != '_' || end[1] == 0)
goto FAIL;
if (end[1] == 'a')
if (end[1] == 'a' && isdigit(end[2])) {
/* end will point to \0 if the strtoul below succeeds. */
appid = strtoul(end+2, &end, 10) + AID_APP;
else if (end[1] == 'i')
} else if (end[1] == 'i' && isdigit(end[2])) {
/* end will point to \0 if the strtoul below succeeds. */
appid = strtoul(end+2, &end, 10) + AID_ISOLATED_START;
else
goto FAIL;
} else {
for (size_t n = 0; n < android_id_count; n++) {
if (!strcmp(android_ids[n].name, end + 1)) {
appid = android_ids[n].aid;
/* move the end pointer to the null terminator */
end += 1 + strlen(android_ids[n].name);
}
}
}
/* check if the entire string was consumed by the 3 cases above */
if (end[0] != 0)
goto FAIL;
@ -278,7 +290,7 @@ app_id_from_name( const char* name )
goto FAIL;
/* check that app id is within range */
if (appid < AID_APP || appid >= AID_USER)
if (appid >= AID_USER)
goto FAIL;
return (unsigned)(appid + userid*AID_USER);
@ -298,14 +310,26 @@ print_app_uid_name(uid_t uid, char* buffer, int bufferlen)
userid = uid / AID_USER;
if (appid < AID_ISOLATED_START) {
if (appid < AID_APP) {
for (size_t n = 0; n < android_id_count; n++) {
if (android_ids[n].aid == appid) {
snprintf(buffer, bufferlen, "u%u_%s", userid, android_ids[n].name);
return;
}
}
}
snprintf(buffer, bufferlen, "u%u_a%u", userid, appid - AID_APP);
} else {
snprintf(buffer, bufferlen, "u%u_i%u", userid, appid - AID_ISOLATED_START);
}
}
/* translate a uid into the corresponding app_<uid>
* passwd structure (sets errno to ENOENT on failure)
/* translate a uid into the corresponding name.
* 0 to AID_APP-1 -> "system", "radio", etc.
* AID_APP to AID_ISOLATED_START-1 -> u0_a1234
* AID_ISOLATED_START to AID_USER-1 -> u0_i1234
* AID_USER+ -> u1_radio, u1_a1234, u2_i1234, etc.
* returns a passwd structure (sets errno to ENOENT on failure)
*/
static struct passwd*
app_id_to_passwd(uid_t uid, stubs_state_t* state)