gethostent.c revision 7c478bd95313f5f23a4c958a745db2134aa03244
/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License, Version 1.0 only
* (the "License"). You may not use this file except in compliance
* with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or http://www.opensolaris.org/os/licensing.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* Copyright (c) 1988-1992 Sun Microsystems Inc
* All Rights Reserved.
*
* nisplus/gethostent.c -- NIS+ backend for nsswitch "hosts" database
*/
#pragma ident "%Z%%M% %I% %E% SMI"
#include <string.h>
#include <netdb.h>
#include <netinet/in.h>
#include <sys/socket.h>
#include "nisplus_common.h"
#include "nisplus_tables.h"
static nss_status_t
getbyname(be, a)
nisplus_backend_ptr_t be;
void *a;
{
nss_XbyY_args_t *argp = (nss_XbyY_args_t *) a;
nss_status_t res;
/*
* Don't have to do anything for case-insensitivity; the NIS+ table
* has the right flags enabled in the 'cname' and 'name' columns.
*/
res = _nss_nisplus_expand_lookup(be, argp, HOST_TAG_NAME,
argp->key.name, HOST_TBLNAME);
if (res != NSS_SUCCESS)
argp->h_errno = __nss2herrno(res);
return (res);
}
static nss_status_t
getbyaddr(be, a)
nisplus_backend_ptr_t be;
void *a;
{
nss_XbyY_args_t *argp = (nss_XbyY_args_t *) a;
struct in_addr addr;
char addrbuf[18];
nss_status_t res;
memcpy(&addr, argp->key.hostaddr.addr, sizeof (addr));
inet_ntoa_r(addr, addrbuf);
res = _nss_nisplus_expand_lookup(be, argp, HOST_TAG_ADDR, addrbuf,
HOST_TBLNAME);
if (res != NSS_SUCCESS)
argp->h_errno = __nss2herrno(res);
return (res);
}
/*
* place the results from the nis_object structure into argp->buf.result
* Returns NSS_STR_PARSE_{SUCCESS, ERANGE, PARSE}
*/
static int
nis_object2ent(nobj, obj, argp)
int nobj;
nis_object *obj;
nss_XbyY_args_t *argp;
{
char *buffer, *limit;
int buflen = argp->buf.buflen;
struct hostent *host;
struct in_addr *addrp;
int count, ret;
limit = argp->buf.buffer + buflen;
host = (struct hostent *)argp->buf.result;
buffer = argp->buf.buffer;
/*
* <--------------- buffer + buflen -------------------------------------->
* |-----------------|-----------------|----------------|----------------|
* | pointers vector | pointers vector | aliases grow | addresses grow |
* | for addresses | for aliases | | |
* | this way -> | this way -> | <- this way |<- this way |
* |-----------------|-----------------|----------------|----------------|
* | grows in PASS 1 | grows in PASS2 | grows in PASS2 | grows in PASS 1|
*
*
* ASSUME: the name and aliases columns in NIS+ tables ARE
* null terminated.
*
*
* PASS 1: get addresses
*/
addrp = (struct in_addr *) ROUND_DOWN(limit, sizeof (*addrp));
host->h_addr_list = (char **) ROUND_UP(buffer, sizeof (char **));
if ((char *)host->h_addr_list >= limit ||
(char *)addrp <= (char *)host->h_addr_list) {
return (NSS_STR_PARSE_ERANGE);
}
ret = __netdb_aliases_from_nisobj(obj, nobj, NULL,
host->h_addr_list, (char **)&addrp, 0, &count, AF_INET);
if (ret != NSS_STR_PARSE_SUCCESS)
return (ret);
/*
* PASS 2: get cname and aliases
*/
host->h_aliases = host->h_addr_list + count + 1;
host->h_name = NULL;
/*
* Assume that CNAME is the first column and NAME the second.
*/
ret = __netdb_aliases_from_nisobj(obj, nobj, NULL, host->h_aliases,
(char **)&addrp, &(host->h_name), &count, AF_INET);
if (ret != NSS_STR_PARSE_SUCCESS)
return (ret);
host->h_addrtype = AF_INET;
host->h_length = sizeof (u_int);
return (NSS_STR_PARSE_SUCCESS);
}
static nisplus_backend_op_t host_ops[] = {
_nss_nisplus_destr,
_nss_nisplus_endent,
_nss_nisplus_setent,
_nss_nisplus_getent,
getbyname,
getbyaddr
};
/*ARGSUSED*/
nss_backend_t *
_nss_nisplus_hosts_constr(dummy1, dummy2, dummy3)
const char *dummy1, *dummy2, *dummy3;
{
return (_nss_nisplus_constr(host_ops,
sizeof (host_ops) / sizeof (host_ops[0]),
HOST_TBLNAME, nis_object2ent));
}