NetBSD-5.0.2/distrib/utils/libhack/getpwent.c
/* $NetBSD: getpwent.c,v 1.9.28.1 2008/11/29 20:52:48 bouyer Exp $ */
/*
* Copyright (c) 1987, 1988, 1989, 1993, 1994, 1995
* The Regents of the University of California. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
/*
* Copied from: lib/libc/gen/getpwent.c
* NetBSD: getpwent.c,v 1.48 2000/10/03 03:22:26 enami Exp
* and then gutted, leaving only /etc/master.passwd support.
*/
#include <sys/cdefs.h>
#ifdef __weak_alias
#define endpwent _endpwent
#define getpwent _getpwent
#define getpwent_r _getpwent_r
#define getpwuid _getpwuid
#define getpwnam _getpwnam
#define setpwent _setpwent
#define setpassent _setpassent
#define getpwuid_r _getpwuid_r
#define getpwnam_r _getpwnam_r
__weak_alias(endpwent,_endpwent)
__weak_alias(getpwent,_getpwent)
__weak_alias(getpwent_r,_getpwent_r)
__weak_alias(getpwuid,_getpwuid)
__weak_alias(getpwnam,_getpwnam)
__weak_alias(setpwent,_setpwent)
__weak_alias(setpassent,_setpassent)
__weak_alias(getpwuid_r,_getpwuid_r)
__weak_alias(getpwnam_r,_getpwnam_r)
#endif
#include <sys/param.h>
#include <limits.h>
#include <pwd.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
static int pwstart(void);
static int pwscan(int, uid_t, const char *, struct passwd *,
char *, size_t);
static int pwmatchline(int, uid_t, const char *, struct passwd *,
char *);
static FILE *_pw_fp;
static struct passwd _pw_passwd; /* password structure */
static int _pw_stayopen; /* keep fd's open */
static int _pw_filesdone;
#define MAXLINELENGTH 1024
static char pwline[MAXLINELENGTH];
struct passwd *
getpwent(void)
{
if ((!_pw_fp && !pwstart()) ||
!pwscan(0, 0, NULL, &_pw_passwd, pwline, sizeof(pwline)))
return (NULL);
return (&_pw_passwd);
}
int
getpwent_r(struct passwd *pwres, char *buf, size_t bufsiz,
struct passwd **pwd)
{
int rval;
if (!_pw_fp && !pwstart())
return 1;
rval = !pwscan(0, 0, NULL, pwres, buf, bufsiz);
if (rval)
*pwd = NULL;
else
*pwd = pwres;
return rval;
}
struct passwd *
getpwnam(const char *name)
{
struct passwd *pwd;
return getpwnam_r(name, &_pw_passwd, pwline, sizeof(pwline),
&pwd) == 0 ? pwd : NULL;
}
int
getpwnam_r(const char *name, struct passwd *pwres, char *buf, size_t bufsiz,
struct passwd **pwd)
{
int rval;
if (!pwstart())
return 1;
rval = !pwscan(1, 0, name, pwres, buf, bufsiz);
if (!_pw_stayopen)
endpwent();
if (rval)
*pwd = NULL;
else
*pwd = pwres;
return rval;
}
struct passwd *
getpwuid(uid_t uid)
{
struct passwd *pwd;
return getpwuid_r(uid, &_pw_passwd, pwline, sizeof(pwline),
&pwd) == 0 ? pwd : NULL;
}
int
getpwuid_r(uid_t uid, struct passwd *pwres, char *buf, size_t bufsiz,
struct passwd **pwd)
{
int rval;
if (!pwstart())
return 1;
rval = !pwscan(1, uid, NULL, pwres, buf, bufsiz);
if (!_pw_stayopen)
endpwent();
if (rval)
*pwd = NULL;
else
*pwd = pwres;
return rval;
}
void
setpwent(void)
{
(void) setpassent(0);
}
int
setpassent(int stayopen)
{
if (!pwstart())
return 0;
_pw_stayopen = stayopen;
return 1;
}
void
endpwent(void)
{
_pw_filesdone = 0;
if (_pw_fp) {
(void)fclose(_pw_fp);
_pw_fp = NULL;
}
}
static int
pwstart(void)
{
_pw_filesdone = 0;
if (_pw_fp) {
rewind(_pw_fp);
return 1;
}
return (_pw_fp = fopen(_PATH_MASTERPASSWD, "r")) ? 1 : 0;
}
static int
pwscan(int search, uid_t uid, const char *name, struct passwd *pwd, char *buf,
size_t bufsiz)
{
if (_pw_filesdone)
return 0;
for (;;) {
if (!fgets(buf, bufsiz, _pw_fp)) {
if (!search)
_pw_filesdone = 1;
return 0;
}
/* skip lines that are too big */
if (!strchr(buf, '\n')) {
int ch;
while ((ch = getc(_pw_fp)) != '\n' && ch != EOF)
;
continue;
}
if (pwmatchline(search, uid, name, pwd, buf))
return 1;
}
/* NOTREACHED */
}
static int
pwmatchline(int search, uid_t uid, const char *name, struct passwd *pwd,
char *buf)
{
unsigned long id;
char *cp, *bp, *ep;
/* name may be NULL if search is nonzero */
bp = buf;
memset(pwd, 0, sizeof(*pwd));
pwd->pw_name = strsep(&bp, ":\n"); /* name */
if (search && name && strcmp(pwd->pw_name, name))
return 0;
pwd->pw_passwd = strsep(&bp, ":\n"); /* passwd */
if (!(cp = strsep(&bp, ":\n"))) /* uid */
return 0;
id = strtoul(cp, &ep, 10);
if (id > UID_MAX || *ep != '\0')
return 0;
pwd->pw_uid = (uid_t)id;
if (search && name == NULL && pwd->pw_uid != uid)
return 0;
if (!(cp = strsep(&bp, ":\n"))) /* gid */
return 0;
id = strtoul(cp, &ep, 10);
if (id > GID_MAX || *ep != '\0')
return 0;
pwd->pw_gid = (gid_t)id;
if (!(pwd->pw_class = strsep(&bp, ":"))) /* class */
return 0;
if (!(ep = strsep(&bp, ":"))) /* change */
return 0;
if (!(ep = strsep(&bp, ":"))) /* expire */
return 0;
if (!(pwd->pw_gecos = strsep(&bp, ":\n"))) /* gecos */
return 0;
if (!(pwd->pw_dir = strsep(&bp, ":\n"))) /* directory */
return 0;
if (!(pwd->pw_shell = strsep(&bp, ":\n"))) /* shell */
return 0;
if (strchr(bp, ':') != NULL)
return 0;
return 1;
}