libsocket/inet/getservbyname_r.c

/*
 * 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) 1991-1994  Sun Microsystems, Inc
 *
 * lib/libsocket/inet/getservbyname_r.c
 *
 * getservbyname_r() is defined in this file. It is implemented on top of
 *   _get_hostserv_inetnetdir_byname() which is also used to implement
 *   netdir_getbyname() for inet family transports.  In turn the common code
 *   uses the name service switch policy for "hosts" and "services" unless
 *   the administrator chooses to bypass the name service switch by
 *   specifying third-party supplied nametoaddr libs for inet transports
 *   in /etc/netconfig.
 *
 * getservbyport_r() is similarly related to _get_hostserv_inetnetdir_byaddr()
 *   and netdir_getbyaddr();
 *
 * The common code lives in lib/libnsl/nss/netdir_inet.c.
 *
 * getservent_r(), setservent() and endservent() are *not* implemented on top
 *   of the common interface;  they go straight to the switch and are
 *   defined in getservent_r.c.
 *
 * There is absolutely no data sharing, not even the stayopen flag or
 *   enumeration state, between getservbyYY_r() and getservent_r();
 */

#pragma ident   "%Z%%M% %I% %E% SMI"

#include <netdb.h>
#include <netdir.h>
#include <sys/types.h>
#include <nss_netdir.h>

extern int str2servent(const char *, int, void *, char *, int);
extern struct netconfig *__rpc_getconfip();

struct servent *
getservbyname_r(const char *name, const char *proto, struct servent *result,
    char *buffer, int buflen)
{
    struct netconfig *nconf;
    struct  nss_netdirbyname_in nssin;
    union   nss_netdirbyname_out nssout;
    int neterr;

    if ((nconf = __rpc_getconfip("udp")) == NULL &&
        (nconf = __rpc_getconfip("tcp")) == NULL) {
        return ((struct servent *)NULL);
    }
    nssin.op_t = NSS_SERV;
    nssin.arg.nss.serv.name = name;
    nssin.arg.nss.serv.proto = proto;
    nssin.arg.nss.serv.buf = buffer;
    nssin.arg.nss.serv.buflen = buflen;

    nssout.nss.serv = result;

    /*
     * We pass in nconf and let the implementation of the long-named func
     * decide whether to use the switch based on nc_nlookups.
     */
    neterr = _get_hostserv_inetnetdir_byname(nconf, &nssin, &nssout);

    (void) freenetconfigent(nconf);
    if (neterr != ND_OK) {
        return ((struct servent *)NULL);
    }
    return (nssout.nss.serv);
}

struct servent *
getservbyport_r(int port, const char *proto, struct servent *result,
    char *buffer, int buflen)
{
    struct netconfig *nconf;
    struct  nss_netdirbyaddr_in nssin;
    union   nss_netdirbyaddr_out nssout;
    int neterr;

    if ((nconf = __rpc_getconfip("udp")) == NULL &&
        (nconf = __rpc_getconfip("tcp")) == NULL) {
        return ((struct servent *)NULL);
    }
    nssin.op_t = NSS_SERV;
    nssin.arg.nss.serv.port = port;
    nssin.arg.nss.serv.proto = proto;
    nssin.arg.nss.serv.buf = buffer;
    nssin.arg.nss.serv.buflen = buflen;

    nssout.nss.serv = result;

    /*
     * We pass in nconf and let the implementation of this long-named func
     * decide whether to use the switch based on nc_nlookups.
     */
    neterr = _get_hostserv_inetnetdir_byaddr(nconf, &nssin, &nssout);

    (void) freenetconfigent(nconf);
    if (neterr != ND_OK) {
        return ((struct servent *)NULL);
    }
    return (nssout.nss.serv);
}