clnt_udp.c

/* @(#)clnt_udp.c	2.2 88/08/01 4.0 RPCSRC */
/*
 * Sun RPC is a product of Sun Microsystems, Inc. and is provided for
 * unrestricted use provided that this legend is included on all tape
 * media and as a part of the software program in whole or part.  Users
 * may copy or modify Sun RPC without charge, but are not authorized
 * to license or distribute it to anyone else except as part of a product or
 * program developed by the user.
 *
 * SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE
 * WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE.
 *
 * Sun RPC is provided with no support and without any obligation on the
 * part of Sun Microsystems, Inc. to assist in its use, correction,
 * modification or enhancement.
 *
 * SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE
 * INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC
 * OR ANY PART THEREOF.
 *
 * In no event will Sun Microsystems, Inc. be liable for any lost revenue
 * or profits or other special, indirect and consequential damages, even if
 * Sun has been advised of the possibility of such damages.
 *
 * Sun Microsystems, Inc.
 * 2550 Garcia Avenue
 * Mountain View, California  94043
 */
#if !defined(lint) && defined(SCCSIDS)
static char sccsid[] = "@(#)clnt_udp.c 1.39 87/08/11 Copyr 1984 Sun Micro";
#endif

/*
 * clnt_udp.c, Implements a UDP/IP based, client side RPC.
 *
 * Copyright (C) 1984, Sun Microsystems, Inc.
 */

#include <stdio.h>
#include <unistd.h>
#include <libintl.h>
#include <rpc/rpc.h>
#include <rpc/xdr.h>
#include <rpc/clnt.h>
#include <sys/poll.h>
#include <sys/socket.h>
#include <sys/ioctl.h>
#include <netdb.h>
#include <errno.h>
#include <rpc/pmap_clnt.h>
#include <net/if.h>

#ifdef IP_RECVERR
#include <errqueue.h>
#include <sys/uio.h>
#endif

extern bool_t xdr_opaque_auth (XDR *, struct opaque_auth *);
extern u_long _create_xid (void);

/*
 * UDP bases client side rpc operations
 */
static enum clnt_stat clntudp_call (CLIENT *, u_long, xdrproc_t, caddr_t,
				    xdrproc_t, caddr_t, struct timeval);
static void clntudp_abort (void);
static void clntudp_geterr (CLIENT *, struct rpc_err *);
static bool_t clntudp_freeres (CLIENT *, xdrproc_t, caddr_t);
static bool_t clntudp_control (CLIENT *, int, char *);
static void clntudp_destroy (CLIENT *);

static struct clnt_ops udp_ops =
{
  clntudp_call,
  clntudp_abort,
  clntudp_geterr,
  clntudp_freeres,
  clntudp_destroy,
  clntudp_control
};

/*
 * Private data kept per client handle
 */
struct cu_data
  {
    int cu_sock;
    bool_t cu_closeit;
    struct sockaddr_in cu_raddr;
    int cu_rlen;
    struct timeval cu_wait;
    struct timeval cu_total;
    struct rpc_err cu_error;
    XDR cu_outxdrs;
    u_int cu_xdrpos;
    u_int cu_sendsz;
    char *cu_outbuf;
    u_int cu_recvsz;
    char cu_inbuf[1];
  };

/*
 * Create a UDP based client handle.
 * If *sockp<0, *sockp is set to a newly created UPD socket.
 * If raddr->sin_port is 0 a binder on the remote machine
 * is consulted for the correct port number.
 * NB: It is the clients responsibility to close *sockp.
 * NB: The rpch->cl_auth is initialized to null authentication.
 *     Caller may wish to set this something more useful.
 *
 * wait is the amount of time used between retransmitting a call if
 * no response has been heard; retransmission occurs until the actual
 * rpc call times out.
 *
 * sendsz and recvsz are the maximum allowable packet sizes that can be
 * sent and received.
 */
CLIENT *
clntudp_bufcreate (struct sockaddr_in *raddr, u_long program, u_long version,
		   struct timeval wait, int *sockp, u_int sendsz,
		   u_int recvsz)
{
  CLIENT *cl;
  struct cu_data *cu = NULL;
  struct rpc_msg call_msg;

  cl = (CLIENT *) mem_alloc (sizeof (CLIENT));
  if (cl == NULL)
    {
      struct rpc_createerr *ce = &get_rpc_createerr ();
      (void) fprintf (stderr, _("clntudp_create: out of memory\n"));
      ce->cf_stat = RPC_SYSTEMERROR;
      ce->cf_error.re_errno = errno;
      goto fooy;
    }
  sendsz = ((sendsz + 3) / 4) * 4;
  recvsz = ((recvsz + 3) / 4) * 4;
  cu = (struct cu_data *) mem_alloc (sizeof (*cu) + sendsz + recvsz);
  if (cu == NULL)
    {
      struct rpc_createerr *ce = &get_rpc_createerr ();
      (void) fprintf (stderr, _("clntudp_create: out of memory\n"));
      ce->cf_stat = RPC_SYSTEMERROR;
      ce->cf_error.re_errno = errno;
      goto fooy;
    }
  cu->cu_outbuf = &cu->cu_inbuf[recvsz];

  if (raddr->sin_port == 0)
    {
      u_short port;
      if ((port =
	   pmap_getport (raddr, program, version, IPPROTO_UDP)) == 0)
	{
	  goto fooy;
	}
      raddr->sin_port = htons (port);
    }
  cl->cl_ops = &udp_ops;
  cl->cl_private = (caddr_t) cu;
  cu->cu_raddr = *raddr;
  cu->cu_rlen = sizeof (cu->cu_raddr);
  cu->cu_wait = wait;
  cu->cu_total.tv_sec = -1;
  cu->cu_total.tv_usec = -1;
  cu->cu_sendsz = sendsz;
  cu->cu_recvsz = recvsz;
  call_msg.rm_xid = _create_xid ();
  call_msg.rm_direction = CALL;
  call_msg.rm_call.cb_rpcvers = RPC_MSG_VERSION;
  call_msg.rm_call.cb_prog = program;
  call_msg.rm_call.cb_vers = version;
  xdrmem_create (&(cu->cu_outxdrs), cu->cu_outbuf,
		 sendsz, XDR_ENCODE);
  if (!xdr_callhdr (&(cu->cu_outxdrs), &call_msg))
    {
      goto fooy;
    }
  cu->cu_xdrpos = XDR_GETPOS (&(cu->cu_outxdrs));
  if (*sockp < 0)
    {
      int dontblock = 1;

      *sockp = __socket (AF_INET, SOCK_DGRAM, IPPROTO_UDP);
      if (*sockp < 0)
	{
	  struct rpc_createerr *ce = &get_rpc_createerr ();
	  ce->cf_stat = RPC_SYSTEMERROR;
	  ce->cf_error.re_errno = errno;
	  goto fooy;
	}
      /* attempt to bind to prov port */
      (void) bindresvport (*sockp, (struct sockaddr_in *) 0);
      /* the sockets rpc controls are non-blocking */
      (void) __ioctl (*sockp, FIONBIO, (char *) &dontblock);
#ifdef IP_RECVERR
      {
	int on = 1;
	setsockopt(*sockp, SOL_IP, IP_RECVERR, &on, sizeof(on));
      }
#endif
      cu->cu_closeit = TRUE;
    }
  else
    {
      cu->cu_closeit = FALSE;
    }
  cu->cu_sock = *sockp;
  cl->cl_auth = authnone_create ();
  return cl;
fooy:
  if (cu)
    mem_free ((caddr_t) cu, sizeof (*cu) + sendsz + recvsz);
  if (cl)
    mem_free ((caddr_t) cl, sizeof (CLIENT));
  return (CLIENT *) NULL;
}

CLIENT *
clntudp_create (raddr, program, version, wait, sockp)
     struct sockaddr_in *raddr;
     u_long program;
     u_long version;
     struct timeval wait;
     int *sockp;
{

  return clntudp_bufcreate (raddr, program, version, wait, sockp,
			    UDPMSGSIZE, UDPMSGSIZE);
}

static int
is_network_up (int sock)
{
  struct ifconf ifc;
  char buf[UDPMSGSIZE];
  struct ifreq ifreq, *ifr;
  int n;

  ifc.ifc_len = sizeof (buf);
  ifc.ifc_buf = buf;
  if (__ioctl(sock, SIOCGIFCONF, (char *) &ifc) == 0)
    {
      ifr = ifc.ifc_req;
      for (n = ifc.ifc_len / sizeof (struct ifreq); n > 0; n--, ifr++)
	{
	  ifreq = *ifr;
	  if (__ioctl (sock, SIOCGIFFLAGS, (char *) &ifreq) < 0)
	    break;

	  if ((ifreq.ifr_flags & IFF_UP)
	      && ifr->ifr_addr.sa_family == AF_INET)
	    return 1;
	}
    }
  return 0;
}

static enum clnt_stat
clntudp_call (cl, proc, xargs, argsp, xresults, resultsp, utimeout)
     CLIENT *cl;	/* client handle */
     u_long proc;		/* procedure number */
     xdrproc_t xargs;		/* xdr routine for args */
     caddr_t argsp;		/* pointer to args */
     xdrproc_t xresults;	/* xdr routine for results */
     caddr_t resultsp;		/* pointer to results */
     struct timeval utimeout;	/* seconds to wait before giving up */
{
  struct cu_data *cu = (struct cu_data *) cl->cl_private;
  XDR *xdrs;
  int outlen = 0;
  int inlen;
  socklen_t fromlen;
  struct pollfd fd;
  int milliseconds = (cu->cu_wait.tv_sec * 1000) +
    (cu->cu_wait.tv_usec / 1000);
  struct sockaddr_in from;
  struct rpc_msg reply_msg;
  XDR reply_xdrs;
  struct timeval time_waited;
  bool_t ok;
  int nrefreshes = 2;		/* number of times to refresh cred */
  struct timeval timeout;
  int anyup;			/* any network interface up */

  if (cu->cu_total.tv_usec == -1)
    {
      timeout = utimeout;	/* use supplied timeout */
    }
  else
    {
      timeout = cu->cu_total;	/* use default timeout */
    }

  time_waited.tv_sec = 0;
  time_waited.tv_usec = 0;
call_again:
  xdrs = &(cu->cu_outxdrs);
  if (xargs == NULL)
    goto get_reply;
  xdrs->x_op = XDR_ENCODE;
  XDR_SETPOS (xdrs, cu->cu_xdrpos);
  /*
   * the transaction is the first thing in the out buffer
   */
  (*(uint32_t *) (cu->cu_outbuf))++;
  if ((!XDR_PUTLONG (xdrs, (long *) &proc)) ||
      (!AUTH_MARSHALL (cl->cl_auth, xdrs)) ||
      (!(*xargs) (xdrs, argsp)))
    return (cu->cu_error.re_status = RPC_CANTENCODEARGS);
  outlen = (int) XDR_GETPOS (xdrs);

send_again:
  if (sendto (cu->cu_sock, cu->cu_outbuf, outlen, 0,
	      (struct sockaddr *) &(cu->cu_raddr), cu->cu_rlen)
      != outlen)
    {
      cu->cu_error.re_errno = errno;
      return (cu->cu_error.re_status = RPC_CANTSEND);
    }

  /*
   * Hack to provide rpc-based message passing
   */
  if (timeout.tv_sec == 0 && timeout.tv_usec == 0)
    {
      return (cu->cu_error.re_status = RPC_TIMEDOUT);
    }
 get_reply:
  /*
   * sub-optimal code appears here because we have
   * some clock time to spare while the packets are in flight.
   * (We assume that this is actually only executed once.)
   */
  reply_msg.acpted_rply.ar_verf = _null_auth;
  reply_msg.acpted_rply.ar_results.where = resultsp;
  reply_msg.acpted_rply.ar_results.proc = xresults;
  fd.fd = cu->cu_sock;
  fd.events = POLLIN;
  anyup = 0;
  for (;;)
    {
      switch (__poll (&fd, 1, milliseconds))
	{

	case 0:
	  if (anyup == 0)
	    {
	      anyup = is_network_up (cu->cu_sock);
	      if (!anyup)
		return (cu->cu_error.re_status = RPC_CANTRECV);
	    }

	  time_waited.tv_sec += cu->cu_wait.tv_sec;
	  time_waited.tv_usec += cu->cu_wait.tv_usec;
	  while (time_waited.tv_usec >= 1000000)
	    {
	      time_waited.tv_sec++;
	      time_waited.tv_usec -= 1000000;
	    }
	  if ((time_waited.tv_sec < timeout.tv_sec) ||
	      ((time_waited.tv_sec == timeout.tv_sec) &&
	       (time_waited.tv_usec < timeout.tv_usec)))
	    goto send_again;
	  return (cu->cu_error.re_status = RPC_TIMEDOUT);

	  /*
	   * buggy in other cases because time_waited is not being
	   * updated.
	   */
	case -1:
	  if (errno == EINTR)
	    continue;
	  cu->cu_error.re_errno = errno;
	  return (cu->cu_error.re_status = RPC_CANTRECV);
	}
#ifdef IP_RECVERR
      if (fd.revents & POLLERR)
	{
	  struct msghdr msg;
	  struct cmsghdr *cmsg;
	  struct sock_extended_err *e;
	  struct sockaddr_in err_addr;
	  struct iovec iov;
	  char *cbuf = (char *) alloca (outlen + 256);
	  int ret;

	  iov.iov_base = cbuf + 256;
	  iov.iov_len = outlen;
	  msg.msg_name = (void *) &err_addr;
	  msg.msg_namelen = sizeof (err_addr);
	  msg.msg_iov = &iov;
	  msg.msg_iovlen = 1;
	  msg.msg_flags = 0;
	  msg.msg_control = cbuf;
	  msg.msg_controllen = 256;
	  ret = recvmsg (cu->cu_sock, &msg, MSG_ERRQUEUE);
	  if (ret >= 0
	      && memcmp (cbuf + 256, cu->cu_outbuf, ret) == 0
	      && (msg.msg_flags & MSG_ERRQUEUE)
	      && ((msg.msg_namelen == 0
		   && ret >= 12)
		  || (msg.msg_namelen == sizeof (err_addr)
		      && err_addr.sin_family == AF_INET
		      && memcmp (&err_addr.sin_addr, &cu->cu_raddr.sin_addr,
				 sizeof (err_addr.sin_addr)) == 0
		      && err_addr.sin_port == cu->cu_raddr.sin_port)))
	    for (cmsg = CMSG_FIRSTHDR (&msg); cmsg;
		 cmsg = CMSG_NXTHDR (&msg, cmsg))
	      if (cmsg->cmsg_level == SOL_IP && cmsg->cmsg_type == IP_RECVERR)
		{
		  e = (struct sock_extended_err *) CMSG_DATA(cmsg);
		  cu->cu_error.re_errno = e->ee_errno;
		  return (cu->cu_error.re_status = RPC_CANTRECV);
		}
	}
#endif
      do
	{
	  fromlen = sizeof (struct sockaddr);
	  inlen = recvfrom (cu->cu_sock, cu->cu_inbuf,
			    (int) cu->cu_recvsz, 0,
			    (struct sockaddr *) &from, &fromlen);
	}
      while (inlen < 0 && errno == EINTR);
      if (inlen < 0)
	{
	  if (errno == EWOULDBLOCK)
	    continue;
	  cu->cu_error.re_errno = errno;
	  return (cu->cu_error.re_status = RPC_CANTRECV);
	}
      if (inlen < 4)
	continue;

      /* see if reply transaction id matches sent id.
        Don't do this if we only wait for a replay */
      if (xargs != NULL
	  && (*((u_int32_t *) (cu->cu_inbuf))
	      != *((u_int32_t *) (cu->cu_outbuf))))
	continue;
      /* we now assume we have the proper reply */
      break;
    }

  /*
   * now decode and validate the response
   */
  xdrmem_create (&reply_xdrs, cu->cu_inbuf, (u_int) inlen, XDR_DECODE);
  ok = xdr_replymsg (&reply_xdrs, &reply_msg);
  /* XDR_DESTROY(&reply_xdrs);  save a few cycles on noop destroy */
  if (ok)
    {
      _seterr_reply (&reply_msg, &(cu->cu_error));
      if (cu->cu_error.re_status == RPC_SUCCESS)
	{
	  if (!AUTH_VALIDATE (cl->cl_auth,
			      &reply_msg.acpted_rply.ar_verf))
	    {
	      cu->cu_error.re_status = RPC_AUTHERROR;
	      cu->cu_error.re_why = AUTH_INVALIDRESP;
	    }
	  if (reply_msg.acpted_rply.ar_verf.oa_base != NULL)
	    {
	      xdrs->x_op = XDR_FREE;
	      (void) xdr_opaque_auth (xdrs,
				      &(reply_msg.acpted_rply.ar_verf));
	    }
	}			/* end successful completion */
      else
	{
	  /* maybe our credentials need to be refreshed ... */
	  if (nrefreshes > 0 && AUTH_REFRESH (cl->cl_auth))
	    {
	      nrefreshes--;
	      goto call_again;
	    }
	}			/* end of unsuccessful completion */
    }				/* end of valid reply message */
  else
    {
      cu->cu_error.re_status = RPC_CANTDECODERES;
    }
  return cu->cu_error.re_status;
}

static void
clntudp_geterr (CLIENT *cl, struct rpc_err *errp)
{
  struct cu_data *cu = (struct cu_data *) cl->cl_private;

  *errp = cu->cu_error;
}


static bool_t
clntudp_freeres (CLIENT *cl, xdrproc_t xdr_res, caddr_t res_ptr)
{
  struct cu_data *cu = (struct cu_data *) cl->cl_private;
  XDR *xdrs = &(cu->cu_outxdrs);

  xdrs->x_op = XDR_FREE;
  return (*xdr_res) (xdrs, res_ptr);
}

static void
clntudp_abort (void)
{
}

static bool_t
clntudp_control (CLIENT *cl, int request, char *info)
{
  struct cu_data *cu = (struct cu_data *) cl->cl_private;

  switch (request)
    {
    case CLSET_FD_CLOSE:
      cu->cu_closeit = TRUE;
      break;
    case CLSET_FD_NCLOSE:
      cu->cu_closeit = FALSE;
      break;
    case CLSET_TIMEOUT:
      cu->cu_total = *(struct timeval *) info;
      break;
    case CLGET_TIMEOUT:
      *(struct timeval *) info = cu->cu_total;
      break;
    case CLSET_RETRY_TIMEOUT:
      cu->cu_wait = *(struct timeval *) info;
      break;
    case CLGET_RETRY_TIMEOUT:
      *(struct timeval *) info = cu->cu_wait;
      break;
    case CLGET_SERVER_ADDR:
      *(struct sockaddr_in *) info = cu->cu_raddr;
      break;
    case CLGET_FD:
      *(int *)info = cu->cu_sock;
      break;
    case CLGET_XID:
      /*
       * use the knowledge that xid is the
       * first element in the call structure *.
       * This will get the xid of the PREVIOUS call
       */
      *(u_long *)info = ntohl(*(u_long *)cu->cu_outbuf);
      break;
    case CLSET_XID:
      /* This will set the xid of the NEXT call */
      *(u_long *)cu->cu_outbuf =  htonl(*(u_long *)info - 1);
      /* decrement by 1 as clntudp_call() increments once */
    case CLGET_VERS:
      /*
       * This RELIES on the information that, in the call body,
       * the version number field is the fifth field from the
       * begining of the RPC header. MUST be changed if the
       * call_struct is changed
       */
      *(u_long *)info = ntohl(*(u_long *)(cu->cu_outbuf +
					  4 * BYTES_PER_XDR_UNIT));
      break;
    case CLSET_VERS:
      *(u_long *)(cu->cu_outbuf + 4 * BYTES_PER_XDR_UNIT)
	= htonl(*(u_long *)info);
      break;
    case CLGET_PROG:
      /*
       * This RELIES on the information that, in the call body,
       * the program number field is the  field from the
       * begining of the RPC header. MUST be changed if the
       * call_struct is changed
       */
      *(u_long *)info = ntohl(*(u_long *)(cu->cu_outbuf +
					  3 * BYTES_PER_XDR_UNIT));
      break;
    case CLSET_PROG:
      *(u_long *)(cu->cu_outbuf + 3 * BYTES_PER_XDR_UNIT)
	= htonl(*(u_long *)info);
      break;
    /* The following are only possible with TI-RPC */
    case CLGET_SVC_ADDR:
    case CLSET_SVC_ADDR:
    case CLSET_PUSH_TIMOD:
    case CLSET_POP_TIMOD:
    default:
      return FALSE;
    }
  return TRUE;
}

static void
clntudp_destroy (CLIENT *cl)
{
  struct cu_data *cu = (struct cu_data *) cl->cl_private;

  if (cu->cu_closeit)
    {
      (void) __close (cu->cu_sock);
    }
  XDR_DESTROY (&(cu->cu_outxdrs));
  mem_free ((caddr_t) cu, (sizeof (*cu) + cu->cu_sendsz + cu->cu_recvsz));
  mem_free ((caddr_t) cl, sizeof (CLIENT));
}