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/*
* clnt_simple.c
* Simplified front end to rpc.
*
* 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.
*/
#include <alloca.h>
#include <errno.h>
#include <stdio.h>
#include <unistd.h>
#include <rpc/rpc.h>
#include <sys/socket.h>
#include <netdb.h>
#include <string.h>
struct callrpc_private_s
{
CLIENT *client;
int socket;
u_long oldprognum, oldversnum, valid;
char *oldhost;
};
#ifdef _RPC_THREAD_SAFE_
#define callrpc_private RPC_THREAD_VARIABLE(callrpc_private_s)
#else
static struct callrpc_private_s *callrpc_private;
#endif
int
callrpc (const char *host, u_long prognum, u_long versnum, u_long procnum,
xdrproc_t inproc, const char *in, xdrproc_t outproc, char *out)
{
struct callrpc_private_s *crp = callrpc_private;
struct sockaddr_in server_addr;
enum clnt_stat clnt_stat;
struct hostent hostbuf, *hp;
struct timeval timeout, tottimeout;
if (crp == 0)
{
crp = (struct callrpc_private_s *) calloc (1, sizeof (*crp));
if (crp == 0)
return 0;
callrpc_private = crp;
}
if (crp->oldhost == NULL)
{
crp->oldhost = malloc (256);
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
{
size_t buflen;
char *buffer;
int herr;
crp->valid = 0;
if (crp->socket != RPC_ANYSOCK)
{
(void) __close (crp->socket);
crp->socket = RPC_ANYSOCK;
}
if (crp->client)
{
clnt_destroy (crp->client);
crp->client = NULL;
}
buflen = 1024;
buffer = __alloca (buflen);
while (__gethostbyname_r (host, &hostbuf, buffer, buflen,
&hp, &herr) != 0
|| hp == NULL)
if (herr != NETDB_INTERNAL || errno != ERANGE)
return (int) RPC_UNKNOWNHOST;
else
{
/* Enlarge the buffer. */
buflen *= 2;
buffer = __alloca (buflen);
}
timeout.tv_usec = 0;
timeout.tv_sec = 5;
memcpy ((char *) &server_addr.sin_addr, hp->h_addr, hp->h_length);
server_addr.sin_family = AF_INET;
server_addr.sin_port = 0;
if ((crp->client = INTUSE(clntudp_create) (&server_addr, (u_long) prognum,
(u_long) versnum, timeout, &crp->socket)) == NULL)
return (int) get_rpc_createerr().cf_stat;
crp->valid = 1;
crp->oldprognum = prognum;
crp->oldversnum = versnum;
(void) strncpy (crp->oldhost, host, 255);
crp->oldhost[255] = '\0';
}
tottimeout.tv_sec = 25;
tottimeout.tv_usec = 0;
clnt_stat = clnt_call (crp->client, procnum, inproc, (char *) in,
outproc, out, tottimeout);
/*
* if call failed, empty cache
*/
if (clnt_stat != RPC_SUCCESS)
crp->valid = 0;
return (int) clnt_stat;
}
#ifdef _RPC_THREAD_SAFE_
void
__rpc_thread_clnt_cleanup (void)
{
struct callrpc_private_s *rcp = RPC_THREAD_VARIABLE(callrpc_private_s);
if (rcp) {
if (rcp->client)
CLNT_DESTROY (rcp->client);
free (rcp);
}
}
#endif /* _RPC_THREAD_SAFE_ */
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