lib/librpc/rpc/clnt_generic.c

/*
 * 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
 */

#if defined(LIBC_SCCS) && !defined(lint)
/*static char *sccsid = "from: @(#)clnt_generic.c 1.4 87/08/11 (C) 1987 SMI";*/
/*static char *sccsid = "from: @(#)clnt_generic.c       2.2 88/08/01 4.0 RPCSRC";*/
static char *rcsid = "$Id: clnt_generic.c,v 1.4 1993/08/26 00:53:15 jtc Exp $";
#endif

/*
 * Copyright (C) 1987, Sun Microsystems, Inc.
 */
#include <rpc/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(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;

        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);
        }
        sin.sin_family = h->h_addrtype;
        sin.sin_port = 0;
        bzero(sin.sin_zero, sizeof(sin.sin_zero));
        bcopy(h->h_addr, (char*)&sin.sin_addr, 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);
                }
                tv.tv_sec = 25;
                clnt_control(client, CLSET_TIMEOUT, &tv);
                break;
        case IPPROTO_TCP:
                client = clnttcp_create(&sin, prog, vers, &sock, 0, 0);
                if (client == NULL) {
                        return (NULL);
                }
                tv.tv_sec = 25;
                tv.tv_usec = 0;
                clnt_control(client, CLSET_TIMEOUT, &tv);
                break;
        default:
                rpc_createerr.cf_stat = RPC_SYSTEMERROR;
                rpc_createerr.cf_error.re_errno = EPFNOSUPPORT;
                return (NULL);
        }
        return (client);
}