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/*
**
** Copyright 2008, The Android Open Source Project
**
** Licensed under the Apache License, Version 2.0 (the "License");
** you may not use this file except in compliance with the License.
** You may obtain a copy of the License at
**
** http://www.apache.org/licenses/LICENSE-2.0
**
** Unless required by applicable law or agreed to in writing, software
** distributed under the License is distributed on an "AS IS" BASIS,
** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
** See the License for the specific language governing permissions and
** limitations under the License.
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#include <dirent.h>
#include <errno.h>
#include <unistd.h>
#include <time.h>
#include <pwd.h>
/*
* SU can be given a specific command to exec. UID _must_ be
* specified for this (ie argc => 3). Full path of file must be specified.
*
* Usage:
* su 1000
* su 1000 /system/bin/ls -l
*/
int main(int argc, char **argv)
{
struct passwd *pw;
int uid, gid;
if(argc < 2) {
uid = gid = 0;
} else {
pw = getpwnam(argv[1]);
if(pw == 0) {
uid = gid = atoi(argv[1]);
} else {
uid = pw->pw_uid;
gid = pw->pw_gid;
}
}
if(setgid(gid) || setuid(uid)) {
fprintf(stderr,"su: permission denied\n");
return 1;
}
/* User specified command for exec. */
if (argc == 3 ) {
if (execlp(argv[2], argv[2], NULL) < 0) {
fprintf(stderr, "su: exec failed for %s Error:%s\n", argv[2],
strerror(errno));
return -errno;
}
} else if (argc > 3) {
/* Copy the rest of the args from main. */
char *exec_args[argc - 1];
memset(exec_args, 0, sizeof(exec_args));
memcpy(exec_args, &argv[2], sizeof(exec_args));
if (execv(argv[2], exec_args) < 0) {
fprintf(stderr, "su: exec failed for %s Error:%s\n", argv[2],
strerror(errno));
return -errno;
}
}
/* Default exec shell. */
execlp("/system/bin/sh", "sh", NULL);
fprintf(stderr, "su: exec failed\n");
return 1;
}
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