393 lines
11 KiB
C
393 lines
11 KiB
C
/*
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* pmap_rmt.c
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* Client interface to pmap rpc service.
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* remote call and broadcast 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 <unistd.h>
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#include <string.h>
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#include <libintl.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 <rpc/pmap_rmt.h>
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#include <sys/poll.h>
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#include <sys/socket.h>
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#include <stdio.h>
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#include <errno.h>
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#include <sys/param.h>
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#include <net/if.h>
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#include <ifaddrs.h>
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#include <sys/ioctl.h>
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#include <arpa/inet.h>
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#include <shlib-compat.h>
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#define MAX_BROADCAST_SIZE 1400
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extern u_long _create_xid (void);
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static const struct timeval timeout = {3, 0};
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/*
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* pmapper remote-call-service interface.
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* This routine is used to call the pmapper remote call service
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* which will look up a service program in the port maps, and then
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* remotely call that routine with the given parameters. This allows
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* programs to do a lookup and call in one step.
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*/
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enum clnt_stat
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pmap_rmtcall (struct sockaddr_in *addr, u_long prog, u_long vers, u_long proc,
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xdrproc_t xdrargs, caddr_t argsp, xdrproc_t xdrres, caddr_t resp,
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struct timeval tout, u_long *port_ptr)
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{
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int socket = -1;
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CLIENT *client;
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struct rmtcallargs a;
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struct rmtcallres r;
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enum clnt_stat stat;
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addr->sin_port = htons (PMAPPORT);
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client = clntudp_create (addr, PMAPPROG, PMAPVERS, timeout, &socket);
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if (client != (CLIENT *) NULL)
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{
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a.prog = prog;
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a.vers = vers;
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a.proc = proc;
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a.args_ptr = argsp;
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a.xdr_args = xdrargs;
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r.port_ptr = port_ptr;
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r.results_ptr = resp;
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r.xdr_results = xdrres;
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stat = CLNT_CALL (client, PMAPPROC_CALLIT,
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(xdrproc_t)xdr_rmtcall_args,
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(caddr_t)&a, (xdrproc_t)xdr_rmtcallres,
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(caddr_t)&r, tout);
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CLNT_DESTROY (client);
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}
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else
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{
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stat = RPC_FAILED;
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}
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/* (void)__close(socket); CLNT_DESTROY already closed it */
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addr->sin_port = 0;
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return stat;
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}
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libc_hidden_nolink_sunrpc (pmap_rmtcall, GLIBC_2_0)
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/*
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* XDR remote call arguments
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* written for XDR_ENCODE direction only
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*/
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bool_t
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xdr_rmtcall_args (XDR *xdrs, struct rmtcallargs *cap)
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{
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u_int lenposition, argposition, position;
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if (xdr_u_long (xdrs, &(cap->prog)) &&
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xdr_u_long (xdrs, &(cap->vers)) &&
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xdr_u_long (xdrs, &(cap->proc)))
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{
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u_long dummy_arglen = 0;
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lenposition = XDR_GETPOS (xdrs);
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if (!xdr_u_long (xdrs, &dummy_arglen))
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return FALSE;
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argposition = XDR_GETPOS (xdrs);
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if (!(*(cap->xdr_args)) (xdrs, cap->args_ptr))
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return FALSE;
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position = XDR_GETPOS (xdrs);
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cap->arglen = (u_long) position - (u_long) argposition;
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XDR_SETPOS (xdrs, lenposition);
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if (!xdr_u_long (xdrs, &(cap->arglen)))
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return FALSE;
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XDR_SETPOS (xdrs, position);
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return TRUE;
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}
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return FALSE;
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}
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libc_hidden_nolink_sunrpc (xdr_rmtcall_args, GLIBC_2_0)
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/*
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* XDR remote call results
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* written for XDR_DECODE direction only
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*/
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bool_t
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xdr_rmtcallres (XDR *xdrs, struct rmtcallres *crp)
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{
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caddr_t port_ptr;
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port_ptr = (caddr_t) crp->port_ptr;
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if (xdr_reference (xdrs, &port_ptr, sizeof (u_long),
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(xdrproc_t) xdr_u_long)
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&& xdr_u_long (xdrs, &crp->resultslen))
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{
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crp->port_ptr = (u_long *) port_ptr;
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return (*(crp->xdr_results)) (xdrs, crp->results_ptr);
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}
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return FALSE;
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}
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libc_hidden_nolink_sunrpc (xdr_rmtcallres, GLIBC_2_0)
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/*
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* The following is kludged-up support for simple rpc broadcasts.
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* Someday a large, complicated system will replace these trivial
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* routines which only support udp/ip .
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*/
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static int
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getbroadcastnets (struct in_addr *addrs, int naddrs)
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{
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struct ifaddrs *ifa;
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if (getifaddrs (&ifa) != 0)
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{
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perror ("broadcast: getifaddrs");
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return 0;
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}
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int i = 0;
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struct ifaddrs *run = ifa;
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while (run != NULL && i < naddrs)
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{
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if ((run->ifa_flags & IFF_BROADCAST) != 0
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&& (run->ifa_flags & IFF_UP) != 0
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&& run->ifa_addr != NULL
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&& run->ifa_addr->sa_family == AF_INET)
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/* Copy the broadcast address. */
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addrs[i++] = ((struct sockaddr_in *) run->ifa_broadaddr)->sin_addr;
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run = run->ifa_next;
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}
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freeifaddrs (ifa);
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return i;
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}
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enum clnt_stat
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clnt_broadcast (/* program number */
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u_long prog,
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/* version number */
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u_long vers,
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/* procedure number */
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u_long proc,
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/* xdr routine for args */
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xdrproc_t xargs,
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/* pointer to args */
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caddr_t argsp,
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/* xdr routine for results */
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xdrproc_t xresults,
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/* pointer to results */
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caddr_t resultsp,
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/* call with each result obtained */
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resultproc_t eachresult)
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{
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enum clnt_stat stat = RPC_FAILED;
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AUTH *unix_auth = authunix_create_default ();
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XDR xdr_stream;
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XDR *xdrs = &xdr_stream;
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struct timeval t;
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int outlen, inlen, nets;
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socklen_t fromlen;
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int sock;
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int on = 1;
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struct pollfd fd;
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int milliseconds;
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int i;
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bool_t done = FALSE;
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u_long xid;
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u_long port;
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struct in_addr addrs[20];
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struct sockaddr_in baddr, raddr; /* broadcast and response addresses */
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struct rmtcallargs a;
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struct rmtcallres r;
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struct rpc_msg msg;
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char outbuf[MAX_BROADCAST_SIZE], inbuf[UDPMSGSIZE];
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/*
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* initialization: create a socket, a broadcast address, and
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* preserialize the arguments into a send buffer.
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*/
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if ((sock = __socket (AF_INET, SOCK_DGRAM, IPPROTO_UDP)) < 0)
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{
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perror (_("Cannot create socket for broadcast rpc"));
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stat = RPC_CANTSEND;
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goto done_broad;
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}
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#ifdef SO_BROADCAST
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if (__setsockopt (sock, SOL_SOCKET, SO_BROADCAST, &on, sizeof (on)) < 0)
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{
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perror (_("Cannot set socket option SO_BROADCAST"));
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stat = RPC_CANTSEND;
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goto done_broad;
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}
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#endif /* def SO_BROADCAST */
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fd.fd = sock;
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fd.events = POLLIN;
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nets = getbroadcastnets (addrs, sizeof (addrs) / sizeof (addrs[0]));
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memset ((char *) &baddr, 0, sizeof (baddr));
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baddr.sin_family = AF_INET;
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baddr.sin_port = htons (PMAPPORT);
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baddr.sin_addr.s_addr = htonl (INADDR_ANY);
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/* baddr.sin_addr.S_un.S_addr = htonl(INADDR_ANY); */
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msg.rm_xid = xid = _create_xid ();
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t.tv_usec = 0;
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msg.rm_direction = CALL;
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msg.rm_call.cb_rpcvers = RPC_MSG_VERSION;
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msg.rm_call.cb_prog = PMAPPROG;
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msg.rm_call.cb_vers = PMAPVERS;
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msg.rm_call.cb_proc = PMAPPROC_CALLIT;
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msg.rm_call.cb_cred = unix_auth->ah_cred;
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msg.rm_call.cb_verf = unix_auth->ah_verf;
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a.prog = prog;
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a.vers = vers;
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a.proc = proc;
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a.xdr_args = xargs;
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a.args_ptr = argsp;
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r.port_ptr = &port;
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r.xdr_results = xresults;
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r.results_ptr = resultsp;
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xdrmem_create (xdrs, outbuf, MAX_BROADCAST_SIZE, XDR_ENCODE);
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if ((!xdr_callmsg (xdrs, &msg))
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|| (!xdr_rmtcall_args (xdrs, &a)))
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{
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stat = RPC_CANTENCODEARGS;
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goto done_broad;
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}
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outlen = (int) xdr_getpos (xdrs);
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xdr_destroy (xdrs);
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/*
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* Basic loop: broadcast a packet and wait a while for response(s).
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* The response timeout grows larger per iteration.
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*/
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for (t.tv_sec = 4; t.tv_sec <= 14; t.tv_sec += 2)
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{
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for (i = 0; i < nets; i++)
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{
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baddr.sin_addr = addrs[i];
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if (__sendto (sock, outbuf, outlen, 0,
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(struct sockaddr *) &baddr,
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sizeof (struct sockaddr)) != outlen)
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{
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perror (_("Cannot send broadcast packet"));
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stat = RPC_CANTSEND;
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goto done_broad;
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}
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}
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if (eachresult == NULL)
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{
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stat = RPC_SUCCESS;
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goto done_broad;
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}
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recv_again:
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msg.acpted_rply.ar_verf = _null_auth;
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msg.acpted_rply.ar_results.where = (caddr_t) & r;
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msg.acpted_rply.ar_results.proc = (xdrproc_t) xdr_rmtcallres;
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milliseconds = t.tv_sec * 1000 + t.tv_usec / 1000;
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switch (__poll(&fd, 1, milliseconds))
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{
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case 0: /* timed out */
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stat = RPC_TIMEDOUT;
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continue;
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case -1: /* some kind of error */
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if (errno == EINTR)
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goto recv_again;
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perror (_("Broadcast poll problem"));
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stat = RPC_CANTRECV;
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goto done_broad;
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} /* end of poll results switch */
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try_again:
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fromlen = sizeof (struct sockaddr);
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inlen = __recvfrom (sock, inbuf, UDPMSGSIZE, 0,
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(struct sockaddr *) &raddr, &fromlen);
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if (inlen < 0)
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{
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if (errno == EINTR)
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goto try_again;
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perror (_("Cannot receive reply to broadcast"));
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stat = RPC_CANTRECV;
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goto done_broad;
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}
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if ((size_t) inlen < sizeof (u_long))
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goto recv_again;
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/*
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* see if reply transaction id matches sent id.
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* If so, decode the results.
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*/
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xdrmem_create (xdrs, inbuf, (u_int) inlen, XDR_DECODE);
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if (xdr_replymsg (xdrs, &msg))
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{
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if (((uint32_t) msg.rm_xid == (uint32_t) xid) &&
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(msg.rm_reply.rp_stat == MSG_ACCEPTED) &&
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(msg.acpted_rply.ar_stat == SUCCESS))
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{
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raddr.sin_port = htons ((u_short) port);
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done = (*eachresult) (resultsp, &raddr);
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}
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/* otherwise, we just ignore the errors ... */
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}
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else
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{
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#ifdef notdef
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/* some kind of deserialization problem ... */
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if ((uint32_t) msg.rm_xid == (uint32_t) xid)
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fprintf (stderr, "Broadcast deserialization problem");
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/* otherwise, just random garbage */
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#endif
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}
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xdrs->x_op = XDR_FREE;
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msg.acpted_rply.ar_results.proc = (xdrproc_t)xdr_void;
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(void) xdr_replymsg (xdrs, &msg);
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(void) (*xresults) (xdrs, resultsp);
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xdr_destroy (xdrs);
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if (done)
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{
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stat = RPC_SUCCESS;
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goto done_broad;
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}
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else
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{
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goto recv_again;
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}
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}
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done_broad:
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(void) __close (sock);
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AUTH_DESTROY (unix_auth);
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return stat;
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}
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libc_hidden_nolink_sunrpc (clnt_broadcast, GLIBC_2_0)
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