155 lines
4.8 KiB
C
155 lines
4.8 KiB
C
/*
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* pmap_getport.c
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* Client interface to pmap rpc service.
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*
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* Copyright (c) 2010, Oracle America, Inc.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are
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* met:
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*
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above
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* copyright notice, this list of conditions and the following
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* disclaimer in the documentation and/or other materials
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* provided with the distribution.
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* * Neither the name of the "Oracle America, Inc." nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
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* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
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* GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <stdbool.h>
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#include <unistd.h>
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#include <rpc/rpc.h>
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#include <rpc/pmap_prot.h>
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#include <rpc/pmap_clnt.h>
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#include <sys/socket.h>
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#include <shlib-compat.h>
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/*
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* Create a socket that is locally bound to a non-reserve port. For
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* any failures, -1 is returned which will cause the RPC code to
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* create the socket.
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*/
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int
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__get_socket (struct sockaddr_in *saddr)
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{
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int so = __socket (AF_INET, SOCK_STREAM, IPPROTO_TCP);
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if (so < 0)
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return -1;
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struct sockaddr_in laddr;
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socklen_t namelen = sizeof (laddr);
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laddr.sin_family = AF_INET;
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laddr.sin_port = 0;
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laddr.sin_addr.s_addr = htonl (INADDR_ANY);
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int cc = __bind (so, (struct sockaddr *) &laddr, namelen);
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if (__glibc_unlikely (cc < 0))
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{
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fail:
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__close (so);
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return -1;
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}
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cc = __connect (so, (struct sockaddr *) saddr, namelen);
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if (__glibc_unlikely (cc < 0))
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goto fail;
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return so;
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}
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/*
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* Find the mapped port for program,version.
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* Internal version with additional parameters.
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* Calls the pmap service remotely to do the lookup.
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* Returns 0 if no map exists.
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*/
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u_short
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__libc_rpc_getport (struct sockaddr_in *address, u_long program,
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u_long version, u_int protocol, time_t timeout_sec,
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time_t tottimeout_sec)
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{
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const struct timeval timeout = {timeout_sec, 0};
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const struct timeval tottimeout = {tottimeout_sec, 0};
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u_short port = 0;
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int socket = -1;
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CLIENT *client;
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struct pmap parms;
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bool closeit = false;
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address->sin_port = htons (PMAPPORT);
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if (protocol == IPPROTO_TCP)
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{
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/* Don't need a reserved port to get ports from the portmapper. */
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socket = __get_socket(address);
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if (socket != -1)
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closeit = true;
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client = clnttcp_create (address, PMAPPROG, PMAPVERS, &socket,
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RPCSMALLMSGSIZE, RPCSMALLMSGSIZE);
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}
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else
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client = clntudp_bufcreate (address, PMAPPROG, PMAPVERS, timeout,
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&socket, RPCSMALLMSGSIZE, RPCSMALLMSGSIZE);
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if (client != (CLIENT *) NULL)
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{
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struct rpc_createerr *ce = &get_rpc_createerr ();
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parms.pm_prog = program;
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parms.pm_vers = version;
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parms.pm_prot = protocol;
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parms.pm_port = 0; /* not needed or used */
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if (CLNT_CALL (client, PMAPPROC_GETPORT, (xdrproc_t)xdr_pmap,
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(caddr_t)&parms, (xdrproc_t)xdr_u_short,
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(caddr_t)&port, tottimeout) != RPC_SUCCESS)
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{
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ce->cf_stat = RPC_PMAPFAILURE;
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clnt_geterr (client, &ce->cf_error);
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}
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else if (port == 0)
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{
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ce->cf_stat = RPC_PROGNOTREGISTERED;
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}
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CLNT_DESTROY (client);
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}
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/* We only need to close the socket here if we opened it. */
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if (closeit)
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(void) __close (socket);
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address->sin_port = 0;
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return port;
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}
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#ifdef EXPORT_RPC_SYMBOLS
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libc_hidden_def (__libc_rpc_getport)
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#else
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libc_hidden_nolink_sunrpc (__libc_rpc_getport, GLIBC_PRIVATE)
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#endif
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/*
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* Find the mapped port for program,version.
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* Calls the pmap service remotely to do the lookup.
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* Returns 0 if no map exists.
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*/
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u_short
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pmap_getport (struct sockaddr_in *address, u_long program, u_long version,
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u_int protocol)
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{
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return __libc_rpc_getport (address, program, version, protocol, 5, 60);
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}
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libc_hidden_nolink_sunrpc (pmap_getport, GLIBC_2_0)
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