1/*	$OpenBSD: clnt_simple.c,v 1.18 2015/08/20 21:49:29 deraadt Exp $ */
2
3/*
4 * Copyright (c) 2010, Oracle America, Inc.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions are
8 * met:
9 *
10 *     * Redistributions of source code must retain the above copyright
11 *       notice, this list of conditions and the following disclaimer.
12 *     * Redistributions in binary form must reproduce the above
13 *       copyright notice, this list of conditions and the following
14 *       disclaimer in the documentation and/or other materials
15 *       provided with the distribution.
16 *     * Neither the name of the "Oracle America, Inc." nor the names of its
17 *       contributors may be used to endorse or promote products derived
18 *       from this software without specific prior written permission.
19 *
20 *   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
21 *   "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
22 *   LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
23 *   FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
24 *   COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
25 *   INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 *   DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
27 *   GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
28 *   INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
29 *   WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
30 *   NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
31 *   OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
32 */
33
34/*
35 * clnt_simple.c
36 * Simplified front end to rpc.
37 */
38
39#include <sys/socket.h>
40#include <netdb.h>
41#include <stdio.h>
42#include <stdlib.h>
43#include <string.h>
44#include <unistd.h>
45#include <limits.h>
46#include <rpc/rpc.h>
47
48static struct callrpc_private {
49	CLIENT	*client;
50	int	socket;
51	int	oldprognum, oldversnum, valid;
52	char	*oldhost;
53} *callrpc_private;
54
55int
56callrpc(char *host, int prognum, int versnum, int procnum, xdrproc_t inproc,
57    char *in, xdrproc_t outproc, char *out)
58{
59	struct callrpc_private *save_callrpc_private = callrpc_private;
60	struct callrpc_private *crp = callrpc_private;
61	struct sockaddr_in server_addr;
62	enum clnt_stat clnt_stat;
63	struct hostent *hp;
64	struct timeval timeout, tottimeout;
65
66	if (crp == NULL) {
67		crp = calloc(1, sizeof (*crp));
68		if (crp == NULL)
69			return RPC_SYSTEMERROR;
70		callrpc_private = crp;
71	}
72	if (crp->oldhost == NULL) {
73		crp->oldhost = malloc(HOST_NAME_MAX+1);
74		if (crp->oldhost == NULL) {
75			free(crp);
76			callrpc_private = save_callrpc_private;
77			return RPC_SYSTEMERROR;
78		}
79		crp->oldhost[0] = 0;
80		crp->socket = RPC_ANYSOCK;
81	}
82	if (crp->valid && crp->oldprognum == prognum && crp->oldversnum == versnum
83		&& strcmp(crp->oldhost, host) == 0) {
84		/* reuse old client */
85	} else {
86		crp->valid = 0;
87		if (crp->socket != -1) {
88			(void)close(crp->socket);
89			crp->socket = -1;
90		}
91		if (crp->client) {
92			CLNT_DESTROY(crp->client);
93			crp->client = NULL;
94		}
95		crp->socket = RPC_ANYSOCK;
96		if ((hp = gethostbyname(host)) == NULL)
97			return ((int) RPC_UNKNOWNHOST);
98		timeout.tv_usec = 0;
99		timeout.tv_sec = 5;
100		memset(&server_addr, 0, sizeof(server_addr));
101		memcpy((char *)&server_addr.sin_addr, hp->h_addr, hp->h_length);
102		server_addr.sin_len = sizeof(struct sockaddr_in);
103		server_addr.sin_family = AF_INET;
104		server_addr.sin_port =  0;
105		if ((crp->client = clntudp_create(&server_addr, (u_long)prognum,
106		    (u_long)versnum, timeout, &crp->socket)) == NULL)
107			return ((int) rpc_createerr.cf_stat);
108		crp->valid = 1;
109		crp->oldprognum = prognum;
110		crp->oldversnum = versnum;
111		strlcpy(crp->oldhost, host, HOST_NAME_MAX+1);
112	}
113	tottimeout.tv_sec = 25;
114	tottimeout.tv_usec = 0;
115	clnt_stat = clnt_call(crp->client, procnum, inproc, in,
116	    outproc, out, tottimeout);
117	/*
118	 * if call failed, empty cache
119	 */
120	if (clnt_stat != RPC_SUCCESS)
121		crp->valid = 0;
122	return ((int) clnt_stat);
123}
124