NetBSD/lib/libc/gen/getgrent.c

386 lines
8.4 KiB
C

/* $NetBSD: getgrent.c,v 1.21 1997/07/21 14:07:05 jtc Exp $ */
/*
* Copyright (c) 1989, 1993
* The Regents of the University of California. All rights reserved.
* Portions Copyright (c) 1994, Jason Downs. 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. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. 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.
*/
#include <sys/cdefs.h>
#if defined(LIBC_SCCS) && !defined(lint)
#if 0
static char sccsid[] = "@(#)getgrent.c 8.2 (Berkeley) 3/21/94";
#else
__RCSID("$NetBSD: getgrent.c,v 1.21 1997/07/21 14:07:05 jtc Exp $");
#endif
#endif /* LIBC_SCCS and not lint */
#include "namespace.h"
#include <sys/types.h>
#include <limits.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <grp.h>
#ifdef YP
#include <rpc/rpc.h>
#include <rpcsvc/yp_prot.h>
#include <rpcsvc/ypclnt.h>
#endif
#ifdef __weak_alias
__weak_alias(endgrent,_endgrent);
__weak_alias(getgrent,_getgrent);
__weak_alias(getgrgid,_getgrgid);
__weak_alias(getgrnam,_getgrnam);
__weak_alias(setgrent,_setgrent);
__weak_alias(setgroupent,_setgroupent);
#endif
static FILE *_gr_fp;
static struct group _gr_group;
static int _gr_stayopen;
static int grscan __P((int, gid_t, const char *));
static int start_gr __P((void));
#define MAXGRP 200
static char *members[MAXGRP];
#define MAXLINELENGTH 1024
static char line[MAXLINELENGTH];
#ifdef YP
enum _ypmode { YPMODE_NONE, YPMODE_FULL, YPMODE_NAME };
static enum _ypmode __ypmode;
static char *__ypcurrent, *__ypdomain;
static int __ypcurrentlen;
#endif
struct group *
getgrent()
{
if ((!_gr_fp && !start_gr()) || !grscan(0, 0, NULL))
return(NULL);
return(&_gr_group);
}
struct group *
getgrnam(name)
const char *name;
{
int rval;
if (!start_gr())
return(NULL);
rval = grscan(1, 0, name);
if (!_gr_stayopen)
endgrent();
return(rval ? &_gr_group : NULL);
}
struct group *
#ifdef __STDC__
getgrgid(gid_t gid)
#else
getgrgid(gid)
gid_t gid;
#endif
{
int rval;
if (!start_gr())
return(NULL);
rval = grscan(1, gid, NULL);
if (!_gr_stayopen)
endgrent();
return(rval ? &_gr_group : NULL);
}
static int
start_gr()
{
if (_gr_fp) {
rewind(_gr_fp);
#ifdef YP
__ypmode = YPMODE_NONE;
if (__ypcurrent)
free(__ypcurrent);
__ypcurrent = NULL;
#endif
return(1);
}
return((_gr_fp = fopen(_PATH_GROUP, "r")) ? 1 : 0);
}
void
setgrent()
{
(void) setgroupent(0);
}
int
setgroupent(stayopen)
int stayopen;
{
if (!start_gr())
return(0);
_gr_stayopen = stayopen;
return(1);
}
void
endgrent()
{
if (_gr_fp) {
(void)fclose(_gr_fp);
_gr_fp = NULL;
#ifdef YP
__ypmode = YPMODE_NONE;
if (__ypcurrent)
free(__ypcurrent);
__ypcurrent = NULL;
#endif
}
}
static int
grscan(search, gid, name)
int search;
gid_t gid;
const char *name;
{
char *cp, **m;
char *bp, *ep;
unsigned long id;
#ifdef YP
char *key, *data;
int keylen, datalen;
int r;
char *grname = (char *)NULL;
#endif
for (;;) {
#ifdef YP
if (__ypmode != YPMODE_NONE) {
if (!__ypdomain) {
if (yp_get_default_domain(&__ypdomain)) {
__ypmode = YPMODE_NONE;
if (grname != (char *)NULL) {
free(grname);
grname = (char *)NULL;
}
continue;
}
}
switch(__ypmode) {
case YPMODE_FULL:
data = NULL;
if (__ypcurrent) {
key = NULL;
r = yp_next(__ypdomain, "group.byname",
__ypcurrent, __ypcurrentlen,
&key, &keylen, &data, &datalen);
free(__ypcurrent);
if (r != 0) {
__ypcurrent = NULL;
if (key)
free(key);
}
else {
__ypcurrent = key;
__ypcurrentlen = keylen;
}
} else {
r = yp_first(__ypdomain, "group.byname",
&__ypcurrent, &__ypcurrentlen,
&data, &datalen);
}
if (r != 0) {
__ypmode = YPMODE_NONE;
if (data)
free(data);
continue;
}
bcopy(data, line, datalen);
free(data);
break;
case YPMODE_NAME:
if (grname != (char *)NULL) {
data = NULL;
r = yp_match(__ypdomain, "group.byname",
grname, strlen(grname),
&data, &datalen);
__ypmode = YPMODE_NONE;
free(grname);
grname = (char *)NULL;
if (r != 0) {
if (data)
free(data);
continue;
}
bcopy(data, line, datalen);
free(data);
} else {
/* YP not available? */
__ypmode = YPMODE_NONE;
continue;
}
break;
case YPMODE_NONE:
abort(); /* Cannot happen */
break;
}
line[datalen] = '\0';
bp = line;
goto parse;
}
#endif /* YP */
if (!fgets(line, sizeof(line), _gr_fp))
return(0);
bp = line;
/* skip lines that are too big */
if (!strchr(line, '\n')) {
int ch;
while ((ch = getc(_gr_fp)) != '\n' && ch != EOF)
;
continue;
}
#ifdef YP
if (line[0] == '+') {
switch(line[1]) {
case ':':
case '\0':
case '\n':
if (_yp_check(NULL)) {
if (!search) {
__ypmode = YPMODE_FULL;
continue;
}
if (!__ypdomain &&
yp_get_default_domain(&__ypdomain))
continue;
data = NULL;
if (name) {
r = yp_match(__ypdomain,
"group.byname",
name, strlen(name),
&data, &datalen);
} else {
char buf[20];
snprintf(buf, sizeof(buf),
"%u", gid);
r = yp_match(__ypdomain,
"group.bygid",
buf, strlen(buf),
&data, &datalen);
}
if (r != 0) {
if (data)
free(data);
continue;
}
bcopy(data, line, datalen);
free(data);
line[datalen] = '\0';
bp = line;
_gr_group.gr_name = strsep(&bp, ":\n");
_gr_group.gr_passwd =
strsep(&bp, ":\n");
if (!(cp = strsep(&bp, ":\n")))
continue;
if (name) {
id = strtoul(cp, &ep, 10);
if (id > GID_MAX || *ep != '\0')
continue;
_gr_group.gr_gid = (gid_t)id;
} else
_gr_group.gr_gid = gid;
goto found_it;
}
break;
default:
if (_yp_check(NULL)) {
char *tptr;
tptr = strsep(&bp, ":\n");
if (search && name &&
strcmp(tptr, name))
continue;
__ypmode = YPMODE_NAME;
grname = strdup(tptr + 1);
continue;
}
break;
}
}
parse:
#endif /* YP */
_gr_group.gr_name = strsep(&bp, ":\n");
if (search && name && strcmp(_gr_group.gr_name, name))
continue;
_gr_group.gr_passwd = strsep(&bp, ":\n");
if (!(cp = strsep(&bp, ":\n")))
continue;
id = strtoul(cp, &ep, 10);
if (id > GID_MAX || *ep != '\0')
continue;
_gr_group.gr_gid = (gid_t)id;
if (search && name == NULL && _gr_group.gr_gid != gid)
continue;
found_it:
cp = NULL;
if (bp == NULL)
continue;
for (m = _gr_group.gr_mem = members;; bp++) {
if (m == &members[MAXGRP - 1])
break;
if (*bp == ',') {
if (cp) {
*bp = '\0';
*m++ = cp;
cp = NULL;
}
} else if (*bp == '\0' || *bp == '\n' || *bp == ' ') {
if (cp) {
*bp = '\0';
*m++ = cp;
}
break;
} else if (cp == NULL)
cp = bp;
}
*m = NULL;
return(1);
}
/* NOTREACHED */
}