/*

 * pmap_rmt.c

 * Client interface to pmap rpc service.

 * remote call and broadcast 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 <unistd.h>

#include <string.h>

#include <libintl.h>

#include <rpc/rpc.h>

#include <rpc/pmap_prot.h>

#include <rpc/pmap_clnt.h>

#include <rpc/pmap_rmt.h>

#include <sys/poll.h>

#include <sys/socket.h>

#include <stdio.h>

#include <errno.h>

#include <sys/param.h>

#include <net/if.h>

#include <ifaddrs.h>

#include <sys/ioctl.h>

#include <arpa/inet.h>

#include <shlib-compat.h>

#define MAX_BROADCAST_SIZE 1400

extern u_long _create_xid (void);

static const struct timeval timeout = {3, 0};

/*

 * pmapper remote-call-service interface.

 * This routine is used to call the pmapper remote call service

 * which will look up a service program in the port maps, and then

 * remotely call that routine with the given parameters.  This allows

 * programs to do a lookup and call in one step.

 */

enum clnt_stat

pmap_rmtcall (struct sockaddr_in *addr, u_long prog, u_long vers, u_long proc,

	      xdrproc_t xdrargs, caddr_t argsp, xdrproc_t xdrres, caddr_t resp,

	      struct timeval tout, u_long *port_ptr)

{

  int socket = -1;

  CLIENT *client;

  struct rmtcallargs a;

  struct rmtcallres r;

  enum clnt_stat stat;

  addr->sin_port = htons (PMAPPORT);

  client = clntudp_create (addr, PMAPPROG, PMAPVERS, timeout, &socket);

  if (client != (CLIENT *) NULL)

    {

      a.prog = prog;

      a.vers = vers;

      a.proc = proc;

      a.args_ptr = argsp;

      a.xdr_args = xdrargs;

      r.port_ptr = port_ptr;

      r.results_ptr = resp;

      r.xdr_results = xdrres;

      stat = CLNT_CALL (client, PMAPPROC_CALLIT,

			(xdrproc_t)xdr_rmtcall_args,

			(caddr_t)&a, (xdrproc_t)xdr_rmtcallres,

			(caddr_t)&r, tout);

      CLNT_DESTROY (client);

    }

  else

    {

      stat = RPC_FAILED;

    }

  /* (void)__close(socket); CLNT_DESTROY already closed it */

  addr->sin_port = 0;

  return stat;

}

libc_hidden_nolink_sunrpc (pmap_rmtcall, GLIBC_2_0)

/*

 * XDR remote call arguments

 * written for XDR_ENCODE direction only

 */

bool_t

xdr_rmtcall_args (XDR *xdrs, struct rmtcallargs *cap)

{

  u_int lenposition, argposition, position;

  if (xdr_u_long (xdrs, &(cap->prog)) &&

      xdr_u_long (xdrs, &(cap->vers)) &&

      xdr_u_long (xdrs, &(cap->proc)))

    {

      u_long dummy_arglen = 0;

      lenposition = XDR_GETPOS (xdrs);

      if (!xdr_u_long (xdrs, &dummy_arglen))

	return FALSE;

      argposition = XDR_GETPOS (xdrs);

      if (!(*(cap->xdr_args)) (xdrs, cap->args_ptr))

	return FALSE;

      position = XDR_GETPOS (xdrs);

      cap->arglen = (u_long) position - (u_long) argposition;

      XDR_SETPOS (xdrs, lenposition);

      if (!xdr_u_long (xdrs, &(cap->arglen)))

	return FALSE;

      XDR_SETPOS (xdrs, position);

      return TRUE;

    }

  return FALSE;

}

libc_hidden_nolink_sunrpc (xdr_rmtcall_args, GLIBC_2_0)

/*

 * XDR remote call results

 * written for XDR_DECODE direction only

 */

bool_t

xdr_rmtcallres (XDR *xdrs, struct rmtcallres *crp)

{

  caddr_t port_ptr;

  port_ptr = (caddr_t) crp->port_ptr;

  if (xdr_reference (xdrs, &port_ptr, sizeof (u_long),

		     (xdrproc_t) xdr_u_long)

      && xdr_u_long (xdrs, &crp->resultslen))

    {

      crp->port_ptr = (u_long *) port_ptr;

      return (*(crp->xdr_results)) (xdrs, crp->results_ptr);

    }

  return FALSE;

}

libc_hidden_nolink_sunrpc (xdr_rmtcallres, GLIBC_2_0)

/*

 * The following is kludged-up support for simple rpc broadcasts.

 * Someday a large, complicated system will replace these trivial

 * routines which only support udp/ip .

 */

static int

getbroadcastnets (struct in_addr *addrs, int naddrs)

{

  struct ifaddrs *ifa;

  if (getifaddrs (&ifa) != 0)

    {

      perror ("broadcast: getifaddrs");

      return 0;

    }

  int i = 0;

  struct ifaddrs *run = ifa;

  while (run != NULL && i < naddrs)

    {

      if ((run->ifa_flags & IFF_BROADCAST) != 0

	  && (run->ifa_flags & IFF_UP) != 0

	  && run->ifa_addr != NULL

	  && run->ifa_addr->sa_family == AF_INET)

	/* Copy the broadcast address.  */

	addrs[i++] = ((struct sockaddr_in *) run->ifa_broadaddr)->sin_addr;

      run = run->ifa_next;

    }

  freeifaddrs (ifa);

  return i;

}

enum clnt_stat

clnt_broadcast (/* program number */

		u_long prog,

		/* version number */

		u_long vers,

		/* procedure number */

		u_long proc,

		/* xdr routine for args */

		xdrproc_t xargs,

		/* pointer to args */

		caddr_t argsp,

		/* xdr routine for results */

		xdrproc_t xresults,

		/* pointer to results */

		caddr_t resultsp,

		/* call with each result obtained */

		resultproc_t eachresult)

{

  enum clnt_stat stat = RPC_FAILED;

  AUTH *unix_auth = authunix_create_default ();

  XDR xdr_stream;

  XDR *xdrs = &xdr_stream;

  struct timeval t;

  int outlen, inlen, nets;

  socklen_t fromlen;

  int sock;

  int on = 1;

  struct pollfd fd;

  int milliseconds;

  int i;

  bool_t done = FALSE;

  u_long xid;

  u_long port;

  struct in_addr addrs[20];

  struct sockaddr_in baddr, raddr;	/* broadcast and response addresses */

  struct rmtcallargs a;

  struct rmtcallres r;

  struct rpc_msg msg;

  char outbuf[MAX_BROADCAST_SIZE], inbuf[UDPMSGSIZE];

  /*

   * initialization: create a socket, a broadcast address, and

   * preserialize the arguments into a send buffer.

   */

  if ((sock = __socket (AF_INET, SOCK_DGRAM, IPPROTO_UDP)) < 0)

    {

      perror (_("Cannot create socket for broadcast rpc"));

      stat = RPC_CANTSEND;

      goto done_broad;

    }

#ifdef SO_BROADCAST

  if (__setsockopt (sock, SOL_SOCKET, SO_BROADCAST, &on, sizeof (on)) < 0)

    {

      perror (_("Cannot set socket option SO_BROADCAST"));

      stat = RPC_CANTSEND;

      goto done_broad;

    }

#endif /* def SO_BROADCAST */

  fd.fd = sock;

  fd.events = POLLIN;

  nets = getbroadcastnets (addrs, sizeof (addrs) / sizeof (addrs[0]));

  memset ((char *) &baddr, 0, sizeof (baddr));

  baddr.sin_family = AF_INET;

  baddr.sin_port = htons (PMAPPORT);

  baddr.sin_addr.s_addr = htonl (INADDR_ANY);

/*      baddr.sin_addr.S_un.S_addr = htonl(INADDR_ANY); */

  msg.rm_xid = xid = _create_xid ();

  t.tv_usec = 0;

  msg.rm_direction = CALL;

  msg.rm_call.cb_rpcvers = RPC_MSG_VERSION;

  msg.rm_call.cb_prog = PMAPPROG;

  msg.rm_call.cb_vers = PMAPVERS;

  msg.rm_call.cb_proc = PMAPPROC_CALLIT;

  msg.rm_call.cb_cred = unix_auth->ah_cred;

  msg.rm_call.cb_verf = unix_auth->ah_verf;

  a.prog = prog;

  a.vers = vers;

  a.proc = proc;

  a.xdr_args = xargs;

  a.args_ptr = argsp;

  r.port_ptr = &por;;

  r.xdr_results = xresults;

  r.results_ptr = resultsp;

  xdrmem_create (xdrs, outbuf, MAX_BROADCAST_SIZE, XDR_ENCODE);

  if ((!xdr_callmsg (xdrs, &msg))

      || (!xdr_rmtcall_args (xdrs, &a)))

    {

      stat = RPC_CANTENCODEARGS;

      goto done_broad;

    }

  outlen = (int) xdr_getpos (xdrs);

  xdr_destroy (xdrs);

  /*

   * Basic loop: broadcast a packet and wait a while for response(s).

   * The response timeout grows larger per iteration.

   */

  for (t.tv_sec = 4; t.tv_sec <= 14; t.tv_sec += 2)

    {

      for (i = 0; i < nets; i++)

	{

	  baddr.sin_addr = addrs[i];

	  if (__sendto (sock, outbuf, outlen, 0,

			(struct sockaddr *) &baddr,

			sizeof (struct sockaddr)) != outlen)

	    {

	      perror (_("Cannot send broadcast packet"));

	      stat = RPC_CANTSEND;

	      goto done_broad;

	    }

	}

      if (eachresult == NULL)

	{

	  stat = RPC_SUCCESS;

	  goto done_broad;

	}

    recv_again:

      msg.acpted_rply.ar_verf = _null_auth;

      msg.acpted_rply.ar_results.where = (caddr_t) & r;

      msg.acpted_rply.ar_results.proc = (xdrproc_t) xdr_rmtcallres;

      milliseconds = t.tv_sec * 1000 + t.tv_usec / 1000;

      switch (__poll(&fd, 1, milliseconds))

	{

	case 0:		/* timed out */

	  stat = RPC_TIMEDOUT;

	  continue;

	case -1:		/* some kind of error */

	  if (errno == EINTR)

	    goto recv_again;

	  perror (_("Broadcast poll problem"));

	  stat = RPC_CANTRECV;

	  goto done_broad;

	}			/* end of poll results switch */

    try_again:

      fromlen = sizeof (struct sockaddr);

      inlen = __recvfrom (sock, inbuf, UDPMSGSIZE, 0,

			  (struct sockaddr *) &raddr, &fromlen);

      if (inlen < 0)

	{

	  if (errno == EINTR)

	    goto try_again;

	  perror (_("Cannot receive reply to broadcast"));

	  stat = RPC_CANTRECV;

	  goto done_broad;

	}

      if ((size_t) inlen < sizeof (u_long))

	goto recv_again;

      /*

       * see if reply transaction id matches sent id.

       * If so, decode the results.

       */

      xdrmem_create (xdrs, inbuf, (u_int) inlen, XDR_DECODE);

      if (xdr_replymsg (xdrs, &msg))

	{

	  if (((uint32_t) msg.rm_xid == (uint32_t) xid) &&

	      (msg.rm_reply.rp_stat == MSG_ACCEPTED) &&

	      (msg.acpted_rply.ar_stat == SUCCESS))

	    {

	      raddr.sin_port = htons ((u_short) port);

	      done = (*eachresult) (resultsp, &raddr);

	    }

	  /* otherwise, we just ignore the errors ... */

	}

      else

	{

#ifdef notdef

	  /* some kind of deserialization problem ... */

	  if ((uint32_t) msg.rm_xid == (uint32_t) xid)

	    fprintf (stderr, "Broadcast deserialization problem");

	  /* otherwise, just random garbage */

#endif

	}

      xdrs->x_op = XDR_FREE;

      msg.acpted_rply.ar_results.proc = (xdrproc_t)xdr_void;

      (void) xdr_replymsg (xdrs, &msg;;

      (void) (*xresults) (xdrs, resultsp);

      xdr_destroy (xdrs);

      if (done)

	{

	  stat = RPC_SUCCESS;

	  goto done_broad;

	}

      else

	{

	  goto recv_again;

	}

    }

done_broad:

  (void) __close (sock);

  AUTH_DESTROY (unix_auth);

  return stat;

}

libc_hidden_nolink_sunrpc (clnt_broadcast, GLIBC_2_0)