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