clnt_generic.c

/* @(#)clnt_generic.c	2.2 88/08/01 4.0 RPCSRC */
/*
 * Copyright (c) 2010, Oracle America, Inc.
 *
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 *     * Redistributions of source code must retain the above copyright
 *       notice, this list of conditions and the following disclaimer.
 *
 *     * 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.
 *
 *     * Neither the name of the "Oracle America, Inc." 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 COPYRIGHT HOLDERS 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 COPYRIGHT
 * HOLDER 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.
 *
 */
#if !defined(lint) && defined(SCCSIDS)
static char sccsid[] = "@(#)clnt_generic.c 1.4 87/08/11 (C) 1987 SMI";
#endif

#include "autoconf.h"
#include <string.h>
#include <gssrpc/rpc.h>
#include <sys/socket.h>
#include <sys/errno.h>
#include <netdb.h>

/*
 * Generic client creation: takes (hostname, program-number, protocol) and
 * returns client handle. Default options are set, which the user can
 * change using the rpc equivalent of ioctl()'s.
 */
CLIENT *
clnt_create(
	char *hostname,
	rpcprog_t prog,
	rpcvers_t vers,
	char *proto)
{
	struct hostent *h;
	struct protoent *p;
	struct sockaddr_in sockin;
	int sock;
	struct timeval tv;
	CLIENT *client;

	h = gethostbyname(hostname);
	if (h == NULL) {
		rpc_createerr.cf_stat = RPC_UNKNOWNHOST;
		return (NULL);
	}
	if (h->h_addrtype != AF_INET) {
		/*
		 * Only support INET for now
		 */
		rpc_createerr.cf_stat = RPC_SYSTEMERROR;
		rpc_createerr.cf_error.re_errno = EAFNOSUPPORT;
		return (NULL);
	}
	memset(&sockin, 0, sizeof(sockin));
	sockin.sin_family = h->h_addrtype;
	sockin.sin_port = 0;
	memmove((char*)&sockin.sin_addr, h->h_addr, sizeof(sockin.sin_addr));
	p = getprotobyname(proto);
	if (p == NULL) {
		rpc_createerr.cf_stat = RPC_UNKNOWNPROTO;
		rpc_createerr.cf_error.re_errno = EPFNOSUPPORT;
		return (NULL);
	}
	sock = RPC_ANYSOCK;
	switch (p->p_proto) {
	case IPPROTO_UDP:
		tv.tv_sec = 5;
		tv.tv_usec = 0;
		client = clntudp_create(&sockin, prog, vers, tv, &sock);
		if (client == NULL) {
			return (NULL);
		}
		break;
	case IPPROTO_TCP:
		client = clnttcp_create(&sockin, prog, vers, &sock, 0, 0);
		if (client == NULL) {
			return (NULL);
		}
		break;
	default:
		rpc_createerr.cf_stat = RPC_SYSTEMERROR;
		rpc_createerr.cf_error.re_errno = EPFNOSUPPORT;
		return (NULL);
	}
	return (client);
}