xref: /src/lib/libc/rpc/clnt_generic.c

/*	$NetBSD: clnt_generic.c,v 1.15 2000/01/22 22:19:17 mycroft Exp $	*/

/*
 * Sun RPC is a product of Sun Microsystems, Inc. and is provided for
 * unrestricted use provided that this legend is included on all tape
 * media and as a part of the software program in whole or part.  Users
 * may copy or modify Sun RPC without charge, but are not authorized
 * to license or distribute it to anyone else except as part of a product or
 * program developed by the user.
 *
 * SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE
 * WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE.
 *
 * Sun RPC is provided with no support and without any obligation on the
 * part of Sun Microsystems, Inc. to assist in its use, correction,
 * modification or enhancement.
 *
 * SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE
 * INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC
 * OR ANY PART THEREOF.
 *
 * In no event will Sun Microsystems, Inc. be liable for any lost revenue
 * or profits or other special, indirect and consequential damages, even if
 * Sun has been advised of the possibility of such damages.
 *
 * Sun Microsystems, Inc.
 * 2550 Garcia Avenue
 * Mountain View, California  94043
 */

#include <sys/cdefs.h>
#if defined(LIBC_SCCS) && !defined(lint)
#if 0
static char *sccsid = "@(#)clnt_generic.c 1.4 87/08/11 (C) 1987 SMI";
static char *sccsid = "@(#)clnt_generic.c	2.2 88/08/01 4.0 RPCSRC";
#else
__RCSID("$NetBSD: clnt_generic.c,v 1.15 2000/01/22 22:19:17 mycroft Exp $");
#endif
#endif

/*
 * Copyright (C) 1987, Sun Microsystems, Inc.
 */
#include "namespace.h"

#include <sys/types.h>
#include <sys/socket.h>

#include <assert.h>
#include <errno.h>
#include <netdb.h>
#include <string.h>

#include <rpc/rpc.h>

#ifdef __weak_alias
__weak_alias(clnt_create,_clnt_create)
#endif

/*
 * 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(hostname, prog, vers, proto)
	char *hostname;
	u_long prog;
	u_long vers;
	char *proto;
{
	struct hostent *h;
	struct protoent *p;
	struct sockaddr_in sin;
	int sock;
	struct timeval tv;
	CLIENT *client;

	_DIAGASSERT(hostname != NULL);
	_DIAGASSERT(proto != NULL);

	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(&sin, 0, sizeof(sin));
	sin.sin_len = sizeof(struct sockaddr_in);
	sin.sin_family = h->h_addrtype;
	sin.sin_port = 0;
	if (h->h_length > sin.sin_len)
		h->h_length = sin.sin_len;
	memcpy(&sin.sin_addr.s_addr, h->h_addr, (size_t)h->h_length);
	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(&sin, prog, vers, tv, &sock);
		if (client == NULL) {
			return (NULL);
		}
		break;
	case IPPROTO_TCP:
		client = clnttcp_create(&sin, 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);
}