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133 lines
4.1 KiB
C
133 lines
4.1 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 <stdio.h>
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#include <string.h>
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#include <assert.h>
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#include "libbb.h"
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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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* if bufsize is > 0 char *group cannot be set to NULL.
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* On success groupname is written on static allocated buffer
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* group (and a pointer to it is returned).
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* On failure gid as string is written to static allocated
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* buffer group and NULL is returned.
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* if bufsize is = 0 char *group can be set to NULL.
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* On success groupname is returned.
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* On failure NULL is returned.
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* if bufsize is < 0 char *group can be set to NULL.
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* On success groupname is returned.
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* On failure an error message is printed and
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* the program exits.
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*/
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/* gets a groupname given a gid */
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char * bb_getgrgid(char *group, long gid, int bufsize)
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{
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struct group *mygroup = getgrgid(gid);
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return bb_getug(group, (mygroup) ?
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mygroup->gr_name : (char *)mygroup, gid, bufsize, 'g');
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}
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/* returns a gid given a group name */
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long bb_xgetgrnam(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 bb_xgetpwnam(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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/* 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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* if bufsize is > 0 char *name cannot be set to NULL.
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* On success username is written on the static allocated
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* buffer name (and a pointer to it is returned).
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* On failure uid as string is written to the static
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* allocated buffer name and NULL is returned.
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* if bufsize is = 0 char *name can be set to NULL.
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* On success username is returned.
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* On failure NULL is returned.
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* if bufsize is < 0 char *name can be set to NULL
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* On success username is returned.
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* On failure an error message is printed and
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* the program exits.
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*/
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/* gets a username given a uid */
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char * bb_getpwuid(char *name, long uid, int bufsize)
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{
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struct passwd *myuser = getpwuid(uid);
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return bb_getug(name, (myuser) ?
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myuser->pw_name : (char *)myuser , uid, bufsize, 'u');
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}
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/*
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* if bufsize is > 0 char *buffer cannot be set to NULL.
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* If idname is not NULL it is written on the static
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* allocated buffer (and a pointer to it is returned).
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* if idname is NULL, id as string is written to the static
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* allocated buffer and NULL is returned.
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* if bufsize is = 0 char *buffer can be set to NULL.
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* If idname exists a pointer to it is returned,
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* else NULL is returned.
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* if bufsize is < 0 char *buffer can be set to NULL.
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* If idname exists a pointer to 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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/* internal function for bb_getpwuid and bb_getgrgid */
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char * bb_getug(char *buffer, char *idname, long id, int bufsize, 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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unsigned long get_ug_id(const char *s,
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long (*__bb_getxxnam)(const char *))
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{
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unsigned long r;
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char *p;
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r = strtoul(s, &p, 10);
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if (*p || (s == p)) {
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r = __bb_getxxnam(s);
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}
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return r;
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}
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