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/*
* pmap_getport.c
* Client interface to pmap rpc service.
*
* 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 <stdbool.h>
#include <unistd.h>
#include <rpc/rpc.h>
#include <rpc/pmap_prot.h>
#include <rpc/pmap_clnt.h>
#include <sys/socket.h>
#include <shlib-compat.h>
/*
* Create a socket that is locally bound to a non-reserve port. For
* any failures, -1 is returned which will cause the RPC code to
* create the socket.
*/
int
__get_socket (struct sockaddr_in *saddr)
{
int so = __socket (AF_INET, SOCK_STREAM, IPPROTO_TCP);
if (so < 0)
return -1;
struct sockaddr_in laddr;
socklen_t namelen = sizeof (laddr);
laddr.sin_family = AF_INET;
laddr.sin_port = 0;
laddr.sin_addr.s_addr = htonl (INADDR_ANY);
int cc = __bind (so, (struct sockaddr *) &laddr, namelen);
if (__glibc_unlikely (cc < 0))
{
fail:
__close (so);
return -1;
}
cc = __connect (so, (struct sockaddr *) saddr, namelen);
if (__glibc_unlikely (cc < 0))
goto fail;
return so;
}
/*
* Find the mapped port for program,version.
* Internal version with additional parameters.
* Calls the pmap service remotely to do the lookup.
* Returns 0 if no map exists.
*/
u_short
__libc_rpc_getport (struct sockaddr_in *address, u_long program,
u_long version, u_int protocol, time_t timeout_sec,
time_t tottimeout_sec)
{
const struct timeval timeout = {timeout_sec, 0};
const struct timeval tottimeout = {tottimeout_sec, 0};
u_short port = 0;
int socket = -1;
CLIENT *client;
struct pmap parms;
bool closeit = false;
address->sin_port = htons (PMAPPORT);
if (protocol == IPPROTO_TCP)
{
/* Don't need a reserved port to get ports from the portmapper. */
socket = __get_socket(address);
if (socket != -1)
closeit = true;
client = clnttcp_create (address, PMAPPROG, PMAPVERS, &socket,
RPCSMALLMSGSIZE, RPCSMALLMSGSIZE);
}
else
client = clntudp_bufcreate (address, PMAPPROG, PMAPVERS, timeout,
&socket, RPCSMALLMSGSIZE, RPCSMALLMSGSIZE);
if (client != (CLIENT *) NULL)
{
struct rpc_createerr *ce = &get_rpc_createerr ();
parms.pm_prog = program;
parms.pm_vers = version;
parms.pm_prot = protocol;
parms.pm_port = 0; /* not needed or used */
if (CLNT_CALL (client, PMAPPROC_GETPORT, (xdrproc_t)xdr_pmap,
(caddr_t)&parms, (xdrproc_t)xdr_u_short,
(caddr_t)&port, tottimeout) != RPC_SUCCESS)
{
ce->cf_stat = RPC_PMAPFAILURE;
clnt_geterr (client, &ce->cf_error);
}
else if (port == 0)
{
ce->cf_stat = RPC_PROGNOTREGISTERED;
}
CLNT_DESTROY (client);
}
/* We only need to close the socket here if we opened it. */
if (closeit)
(void) __close (socket);
address->sin_port = 0;
return port;
}
#ifdef EXPORT_RPC_SYMBOLS
libc_hidden_def (__libc_rpc_getport)
#else
libc_hidden_nolink_sunrpc (__libc_rpc_getport, GLIBC_PRIVATE)
#endif
/*
* Find the mapped port for program,version.
* Calls the pmap service remotely to do the lookup.
* Returns 0 if no map exists.
*/
u_short
pmap_getport (struct sockaddr_in *address, u_long program, u_long version,
u_int protocol)
{
return __libc_rpc_getport (address, program, version, protocol, 5, 60);
}
libc_hidden_nolink_sunrpc (pmap_getport, GLIBC_2_0)
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