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clnt_generic.c revision 1.13 
      1 /*	$NetBSD: clnt_generic.c,v 1.13 1999/09/16 11:45:22 lukem Exp $	*/
      2 
      3 /*
      4  * Sun RPC is a product of Sun Microsystems, Inc. and is provided for
      5  * unrestricted use provided that this legend is included on all tape
      6  * media and as a part of the software program in whole or part.  Users
      7  * may copy or modify Sun RPC without charge, but are not authorized
      8  * to license or distribute it to anyone else except as part of a product or
      9  * program developed by the user.
     10  *
     11  * SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE
     12  * WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR
     13  * PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE.
     14  *
     15  * Sun RPC is provided with no support and without any obligation on the
     16  * part of Sun Microsystems, Inc. to assist in its use, correction,
     17  * modification or enhancement.
     18  *
     19  * SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE
     20  * INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC
     21  * OR ANY PART THEREOF.
     22  *
     23  * In no event will Sun Microsystems, Inc. be liable for any lost revenue
     24  * or profits or other special, indirect and consequential damages, even if
     25  * Sun has been advised of the possibility of such damages.
     26  *
     27  * Sun Microsystems, Inc.
     28  * 2550 Garcia Avenue
     29  * Mountain View, California  94043
     30  */
     31 
     32 #include <sys/cdefs.h>
     33 #if defined(LIBC_SCCS) && !defined(lint)
     34 #if 0
     35 static char *sccsid = "@(#)clnt_generic.c 1.4 87/08/11 (C) 1987 SMI";
     36 static char *sccsid = "@(#)clnt_generic.c	2.2 88/08/01 4.0 RPCSRC";
     37 #else
     38 __RCSID("$NetBSD: clnt_generic.c,v 1.13 1999/09/16 11:45:22 lukem Exp $");
     39 #endif
     40 #endif
     41 
     42 /*
     43  * Copyright (C) 1987, Sun Microsystems, Inc.
     44  */
     45 #include "namespace.h"
     46 
     47 #include <sys/types.h>
     48 #include <sys/socket.h>
     49 
     50 #include <assert.h>
     51 #include <errno.h>
     52 #include <netdb.h>
     53 #include <string.h>
     54 
     55 #include <rpc/rpc.h>
     56 
     57 #ifdef __weak_alias
     58 __weak_alias(clnt_create,_clnt_create);
     59 #endif
     60 
     61 /*
     62  * Generic client creation: takes (hostname, program-number, protocol) and
     63  * returns client handle. Default options are set, which the user can
     64  * change using the rpc equivalent of ioctl()'s.
     65  */
     66 CLIENT *
     67 clnt_create(hostname, prog, vers, proto)
     68 	char *hostname;
     69 	u_long prog;
     70 	u_long vers;
     71 	char *proto;
     72 {
     73 	struct hostent *h;
     74 	struct protoent *p;
     75 	struct sockaddr_in sin;
     76 	int sock;
     77 	struct timeval tv;
     78 	CLIENT *client;
     79 
     80 	_DIAGASSERT(hostname != NULL);
     81 	_DIAGASSERT(proto != NULL);
     82 #ifdef _DIAGNOSTIC
     83 	if (hostname == NULL || proto == NULL) {
     84 		rpc_createerr.cf_stat = RPC_SYSTEMERROR;
     85 		rpc_createerr.cf_error.re_errno = EFAULT;
     86 		return (NULL);
     87 	}
     88 #endif
     89 
     90 	h = gethostbyname(hostname);
     91 	if (h == NULL) {
     92 		rpc_createerr.cf_stat = RPC_UNKNOWNHOST;
     93 		return (NULL);
     94 	}
     95 	if (h->h_addrtype != AF_INET) {
     96 		/*
     97 		 * Only support INET for now
     98 		 */
     99 		rpc_createerr.cf_stat = RPC_SYSTEMERROR;
    100 		rpc_createerr.cf_error.re_errno = EAFNOSUPPORT;
    101 		return (NULL);
    102 	}
    103 	memset(&sin, 0, sizeof(sin));
    104 	sin.sin_len = sizeof(struct sockaddr_in);
    105 	sin.sin_family = h->h_addrtype;
    106 	sin.sin_port = 0;
    107 	if (h->h_length > sin.sin_len)
    108 		h->h_length = sin.sin_len;
    109 	memcpy(&sin.sin_addr.s_addr, h->h_addr, (size_t)h->h_length);
    110 	p = getprotobyname(proto);
    111 	if (p == NULL) {
    112 		rpc_createerr.cf_stat = RPC_UNKNOWNPROTO;
    113 		rpc_createerr.cf_error.re_errno = EPFNOSUPPORT;
    114 		return (NULL);
    115 	}
    116 	sock = RPC_ANYSOCK;
    117 	switch (p->p_proto) {
    118 	case IPPROTO_UDP:
    119 		tv.tv_sec = 5;
    120 		tv.tv_usec = 0;
    121 		client = clntudp_create(&sin, prog, vers, tv, &sock);
    122 		if (client == NULL) {
    123 			return (NULL);
    124 		}
    125 		break;
    126 	case IPPROTO_TCP:
    127 		client = clnttcp_create(&sin, prog, vers, &sock, 0, 0);
    128 		if (client == NULL) {
    129 			return (NULL);
    130 		}
    131 		break;
    132 	default:
    133 		rpc_createerr.cf_stat = RPC_SYSTEMERROR;
    134 		rpc_createerr.cf_error.re_errno = EPFNOSUPPORT;
    135 		return (NULL);
    136 	}
    137 	return (client);
    138 }
    139