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/* $OpenBSD: clnt_simple.c,v 1.18 2015/08/20 21:49:29 deraadt Exp $ */
/*
* Copyright (c) 2010, Oracle America, Inc.
*
* 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.
*/
/*
* clnt_simple.c
* Simplified front end to rpc.
*/
#include <sys/socket.h>
#include <netdb.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <limits.h>
#include <rpc/rpc.h>
static struct callrpc_private {
CLIENT *client;
int socket;
int oldprognum, oldversnum, valid;
char *oldhost;
} *callrpc_private;
int
callrpc(char *host, int prognum, int versnum, int procnum, xdrproc_t inproc,
char *in, xdrproc_t outproc, char *out)
{
struct callrpc_private *save_callrpc_private = callrpc_private;
struct callrpc_private *crp = callrpc_private;
struct sockaddr_in server_addr;
enum clnt_stat clnt_stat;
struct hostent *hp;
struct timeval timeout, tottimeout;
if (crp == NULL) {
crp = calloc(1, sizeof (*crp));
if (crp == NULL)
return RPC_SYSTEMERROR;
callrpc_private = crp;
}
if (crp->oldhost == NULL) {
crp->oldhost = malloc(HOST_NAME_MAX+1);
if (crp->oldhost == NULL) {
free(crp);
callrpc_private = save_callrpc_private;
return RPC_SYSTEMERROR;
}
crp->oldhost[0] = 0;
crp->socket = RPC_ANYSOCK;
}
if (crp->valid && crp->oldprognum == prognum && crp->oldversnum == versnum
&& strcmp(crp->oldhost, host) == 0) {
/* reuse old client */
} else {
crp->valid = 0;
if (crp->socket != -1) {
(void)close(crp->socket);
crp->socket = -1;
}
if (crp->client) {
CLNT_DESTROY(crp->client);
crp->client = NULL;
}
crp->socket = RPC_ANYSOCK;
if ((hp = gethostbyname(host)) == NULL)
return ((int) RPC_UNKNOWNHOST);
timeout.tv_usec = 0;
timeout.tv_sec = 5;
memset(&server_addr, 0, sizeof(server_addr));
memcpy((char *)&server_addr.sin_addr, hp->h_addr, hp->h_length);
server_addr.sin_len = sizeof(struct sockaddr_in);
server_addr.sin_family = AF_INET;
server_addr.sin_port = 0;
if ((crp->client = clntudp_create(&server_addr, (u_long)prognum,
(u_long)versnum, timeout, &crp->socket)) == NULL)
return ((int) rpc_createerr.cf_stat);
crp->valid = 1;
crp->oldprognum = prognum;
crp->oldversnum = versnum;
strlcpy(crp->oldhost, host, HOST_NAME_MAX+1);
}
tottimeout.tv_sec = 25;
tottimeout.tv_usec = 0;
clnt_stat = clnt_call(crp->client, procnum, inproc, in,
outproc, out, tottimeout);
/*
* if call failed, empty cache
*/
if (clnt_stat != RPC_SUCCESS)
crp->valid = 0;
return ((int) clnt_stat);
}
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