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/* 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)
/*
* if bufsize is > 0 char *buffer cannot be set to NULL.
* If idname is not NULL it is written on the static
* allocated buffer (and a pointer to it is returned).
* if idname is NULL, id as string is written to the static
* allocated buffer and NULL is returned.
* if bufsize is = 0 char *buffer can be set to NULL.
* If idname exists a pointer to it is returned,
* else NULL is returned.
* if bufsize is < 0 char *buffer can be set to NULL.
* If idname exists a pointer to it is returned,
* else an error message is printed and the program exits.
*/
/* internal function for bb_getpwuid and bb_getgrgid */
static char* bb_getug(char *buffer, char *idname, long id, int bufsize, 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;
}
/* Hacked by Tito Ragusa (c) 2004 <farmatito@tiscali.it> to make it more
* flexible :
*
* if bufsize is > 0 char *group cannot be set to NULL.
* On success groupname is written on static allocated buffer
* group (and a pointer to it is returned).
* On failure gid as string is written to static allocated
* buffer group and NULL is returned.
* if bufsize is = 0 char *group can be set to NULL.
* On success groupname is returned.
* On failure NULL is returned.
* if bufsize is < 0 char *group can be set to NULL.
* On success groupname is returned.
* On failure an error message is printed and
* the program exits.
*/
/* gets a groupname given a gid */
char* bb_getgrgid(char *group, long gid, int bufsize)
{
struct group *mygroup = getgrgid(gid);
return bb_getug(group,
mygroup ? mygroup->gr_name : (char *)mygroup,
gid, bufsize, 'g');
}
/* returns a gid given a group name */
long 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 xuname2uid(const char *name)
{
struct passwd *myuser;
myuser = getpwnam(name);
if (myuser == NULL)
bb_error_msg_and_die("unknown user name: %s", name);
return myuser->pw_uid;
}
/* Hacked by Tito Ragusa (c) 2004 <farmatito@tiscali.it> to make it more
* flexible :
*
* if bufsize is > 0 char *name cannot be set to NULL.
* On success username is written on the static allocated
* buffer name (and a pointer to it is returned).
* On failure uid as string is written to the static
* allocated buffer name and NULL is returned.
* if bufsize is = 0 char *name can be set to NULL.
* On success username is returned.
* On failure NULL is returned.
* if bufsize is < 0 char *name can be set to NULL
* On success username is returned.
* On failure an error message is printed and
* the program exits.
*/
/* gets a username given a uid */
char* bb_getpwuid(char *name, long uid, int bufsize)
{
struct passwd *myuser = getpwuid(uid);
return bb_getug(name, myuser ? myuser->pw_name : (char *)myuser,
uid, bufsize, 'u');
}
unsigned long get_ug_id(const char *s,
long (*xname2id)(const char *))
{
unsigned long r;
r = bb_strtoul(s, NULL, 10);
if (errno)
return xname2id(s);
return r;
}
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