mirror of
https://github.com/topjohnwu/ndk-busybox.git
synced 2024-12-15 07:48:30 +00:00
100 lines
2.5 KiB
C
100 lines
2.5 KiB
C
/* vi: set sw=4 ts=4: */
|
|
/*
|
|
* password utility routines.
|
|
*
|
|
* Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
|
|
*
|
|
* Licensed under the GPL v2 or later, see the file LICENSE in this tarball.
|
|
*/
|
|
|
|
#include "libbb.h"
|
|
|
|
#define assert(x) ((void)0)
|
|
|
|
/* internal function for bb_getpwuid and bb_getgrgid */
|
|
/* Hacked by Tito Ragusa (c) 2004 <farmatito@tiscali.it> to make it more
|
|
* flexible:
|
|
*
|
|
* bufsize > 0: If idname is not NULL it is copied to buffer,
|
|
* and buffer is returned. Else id as string is written
|
|
* to buffer, and NULL is returned.
|
|
*
|
|
* bufsize == 0: idname is returned.
|
|
*
|
|
* bufsize < 0: If idname is not NULL it is returned.
|
|
* Else an error message is printed and the program exits.
|
|
*/
|
|
static char* bb_getug(char *buffer, int bufsize, char *idname, long id, char prefix)
|
|
{
|
|
if (bufsize > 0) {
|
|
assert(buffer != NULL);
|
|
if (idname) {
|
|
return safe_strncpy(buffer, idname, bufsize);
|
|
}
|
|
snprintf(buffer, bufsize, "%ld", id);
|
|
} else if (bufsize < 0 && !idname) {
|
|
bb_error_msg_and_die("unknown %cid %ld", prefix, id);
|
|
}
|
|
return idname;
|
|
}
|
|
|
|
/* bb_getpwuid, bb_getgrgid:
|
|
* bb_getXXXid(buf, bufsz, id) - copy user/group name or id
|
|
* as a string to buf, return user/group name or NULL
|
|
* bb_getXXXid(NULL, 0, id) - return user/group name or NULL
|
|
* bb_getXXXid(NULL, -1, id) - return user/group name or exit
|
|
*/
|
|
/* gets a username given a uid */
|
|
char* FAST_FUNC bb_getpwuid(char *name, int bufsize, long uid)
|
|
{
|
|
struct passwd *myuser = getpwuid(uid);
|
|
|
|
return bb_getug(name, bufsize,
|
|
(myuser ? myuser->pw_name : (char*)myuser),
|
|
uid, 'u');
|
|
}
|
|
/* gets a groupname given a gid */
|
|
char* FAST_FUNC bb_getgrgid(char *group, int bufsize, long gid)
|
|
{
|
|
struct group *mygroup = getgrgid(gid);
|
|
|
|
return bb_getug(group, bufsize,
|
|
(mygroup ? mygroup->gr_name : (char*)mygroup),
|
|
gid, 'g');
|
|
}
|
|
|
|
/* returns a gid given a group name */
|
|
long FAST_FUNC xgroup2gid(const char *name)
|
|
{
|
|
struct group *mygroup;
|
|
|
|
mygroup = getgrnam(name);
|
|
if (mygroup == NULL)
|
|
bb_error_msg_and_die("unknown group name: %s", name);
|
|
|
|
return mygroup->gr_gid;
|
|
}
|
|
|
|
/* returns a uid given a username */
|
|
long FAST_FUNC xuname2uid(const char *name)
|
|
{
|
|
struct passwd *myuser;
|
|
|
|
myuser = getpwnam(name);
|
|
if (myuser == NULL)
|
|
bb_error_msg_and_die("unknown user %s", name);
|
|
|
|
return myuser->pw_uid;
|
|
}
|
|
|
|
unsigned long FAST_FUNC get_ug_id(const char *s,
|
|
long FAST_FUNC (*xname2id)(const char *))
|
|
{
|
|
unsigned long r;
|
|
|
|
r = bb_strtoul(s, NULL, 10);
|
|
if (errno)
|
|
return xname2id(s);
|
|
return r;
|
|
}
|