552 lines
15 KiB
C
552 lines
15 KiB
C
/* @(#)clnt_udp.c 2.2 88/08/01 4.0 RPCSRC */
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/*
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* Sun RPC is a product of Sun Microsystems, Inc. and is provided for
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* unrestricted use provided that this legend is included on all tape
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* media and as a part of the software program in whole or part. Users
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* may copy or modify Sun RPC without charge, but are not authorized
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* to license or distribute it to anyone else except as part of a product or
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* program developed by the user.
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*
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* SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE
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* WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE.
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*
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* Sun RPC is provided with no support and without any obligation on the
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* part of Sun Microsystems, Inc. to assist in its use, correction,
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* modification or enhancement.
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*
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* SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE
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* INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC
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* OR ANY PART THEREOF.
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*
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* In no event will Sun Microsystems, Inc. be liable for any lost revenue
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* or profits or other special, indirect and consequential damages, even if
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* Sun has been advised of the possibility of such damages.
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*
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* Sun Microsystems, Inc.
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* 2550 Garcia Avenue
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* Mountain View, California 94043
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*/
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#if !defined(lint) && defined(SCCSIDS)
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static char sccsid[] = "@(#)clnt_udp.c 1.39 87/08/11 Copyr 1984 Sun Micro";
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#endif
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/*
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* clnt_udp.c, Implements a UDP/IP based, client side RPC.
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*
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* Copyright (C) 1984, Sun Microsystems, Inc.
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*/
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#include <stdio.h>
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#include <unistd.h>
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#include <libintl.h>
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#include <rpc/rpc.h>
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#include <rpc/xdr.h>
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#include <rpc/clnt.h>
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#include <sys/poll.h>
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#include <sys/socket.h>
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#include <sys/ioctl.h>
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#include <netdb.h>
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#include <errno.h>
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#include <rpc/pmap_clnt.h>
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#include <net/if.h>
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extern bool_t xdr_opaque_auth (XDR *, struct opaque_auth *);
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extern u_long _create_xid (void);
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/*
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* UDP bases client side rpc operations
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*/
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static enum clnt_stat clntudp_call (CLIENT *, u_long, xdrproc_t, caddr_t,
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xdrproc_t, caddr_t, struct timeval);
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static void clntudp_abort (void);
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static void clntudp_geterr (CLIENT *, struct rpc_err *);
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static bool_t clntudp_freeres (CLIENT *, xdrproc_t, caddr_t);
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static bool_t clntudp_control (CLIENT *, int, char *);
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static void clntudp_destroy (CLIENT *);
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static struct clnt_ops udp_ops =
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{
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clntudp_call,
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clntudp_abort,
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clntudp_geterr,
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clntudp_freeres,
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clntudp_destroy,
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clntudp_control
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};
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/*
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* Private data kept per client handle
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*/
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struct cu_data
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{
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int cu_sock;
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bool_t cu_closeit;
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struct sockaddr_in cu_raddr;
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int cu_rlen;
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struct timeval cu_wait;
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struct timeval cu_total;
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struct rpc_err cu_error;
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XDR cu_outxdrs;
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u_int cu_xdrpos;
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u_int cu_sendsz;
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char *cu_outbuf;
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u_int cu_recvsz;
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char cu_inbuf[1];
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};
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/*
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* Create a UDP based client handle.
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* If *sockp<0, *sockp is set to a newly created UPD socket.
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* If raddr->sin_port is 0 a binder on the remote machine
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* is consulted for the correct port number.
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* NB: It is the clients responsibility to close *sockp.
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* NB: The rpch->cl_auth is initialized to null authentication.
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* Caller may wish to set this something more useful.
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*
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* wait is the amount of time used between retransmitting a call if
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* no response has been heard; retransmission occurs until the actual
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* rpc call times out.
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*
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* sendsz and recvsz are the maximum allowable packet sizes that can be
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* sent and received.
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*/
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CLIENT *
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clntudp_bufcreate (struct sockaddr_in *raddr, u_long program, u_long version,
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struct timeval wait, int *sockp, u_int sendsz,
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u_int recvsz)
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{
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CLIENT *cl;
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struct cu_data *cu = NULL;
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struct rpc_msg call_msg;
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cl = (CLIENT *) mem_alloc (sizeof (CLIENT));
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if (cl == NULL)
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{
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(void) fprintf (stderr, _("clntudp_create: out of memory\n"));
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rpc_createerr.cf_stat = RPC_SYSTEMERROR;
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rpc_createerr.cf_error.re_errno = errno;
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goto fooy;
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}
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sendsz = ((sendsz + 3) / 4) * 4;
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recvsz = ((recvsz + 3) / 4) * 4;
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cu = (struct cu_data *) mem_alloc (sizeof (*cu) + sendsz + recvsz);
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if (cu == NULL)
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{
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(void) fprintf (stderr, _("clntudp_create: out of memory\n"));
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rpc_createerr.cf_stat = RPC_SYSTEMERROR;
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rpc_createerr.cf_error.re_errno = errno;
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goto fooy;
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}
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cu->cu_outbuf = &cu->cu_inbuf[recvsz];
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if (raddr->sin_port == 0)
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{
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u_short port;
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if ((port =
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pmap_getport (raddr, program, version, IPPROTO_UDP)) == 0)
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{
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goto fooy;
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}
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raddr->sin_port = htons (port);
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}
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cl->cl_ops = &udp_ops;
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cl->cl_private = (caddr_t) cu;
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cu->cu_raddr = *raddr;
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cu->cu_rlen = sizeof (cu->cu_raddr);
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cu->cu_wait = wait;
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cu->cu_total.tv_sec = -1;
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cu->cu_total.tv_usec = -1;
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cu->cu_sendsz = sendsz;
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cu->cu_recvsz = recvsz;
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call_msg.rm_xid = _create_xid ();
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call_msg.rm_direction = CALL;
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call_msg.rm_call.cb_rpcvers = RPC_MSG_VERSION;
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call_msg.rm_call.cb_prog = program;
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call_msg.rm_call.cb_vers = version;
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xdrmem_create (&(cu->cu_outxdrs), cu->cu_outbuf,
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sendsz, XDR_ENCODE);
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if (!xdr_callhdr (&(cu->cu_outxdrs), &call_msg))
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{
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goto fooy;
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}
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cu->cu_xdrpos = XDR_GETPOS (&(cu->cu_outxdrs));
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if (*sockp < 0)
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{
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int dontblock = 1;
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*sockp = __socket (AF_INET, SOCK_DGRAM, IPPROTO_UDP);
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if (*sockp < 0)
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{
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rpc_createerr.cf_stat = RPC_SYSTEMERROR;
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rpc_createerr.cf_error.re_errno = errno;
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goto fooy;
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}
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/* attempt to bind to prov port */
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(void) bindresvport (*sockp, (struct sockaddr_in *) 0);
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/* the sockets rpc controls are non-blocking */
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(void) __ioctl (*sockp, FIONBIO, (char *) &dontblock);
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cu->cu_closeit = TRUE;
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}
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else
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{
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cu->cu_closeit = FALSE;
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}
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cu->cu_sock = *sockp;
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cl->cl_auth = authnone_create ();
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return cl;
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fooy:
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if (cu)
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mem_free ((caddr_t) cu, sizeof (*cu) + sendsz + recvsz);
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if (cl)
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mem_free ((caddr_t) cl, sizeof (CLIENT));
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return (CLIENT *) NULL;
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}
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CLIENT *
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clntudp_create (raddr, program, version, wait, sockp)
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struct sockaddr_in *raddr;
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u_long program;
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u_long version;
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struct timeval wait;
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int *sockp;
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{
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return clntudp_bufcreate (raddr, program, version, wait, sockp,
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UDPMSGSIZE, UDPMSGSIZE);
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}
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static int
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is_network_up (int sock)
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{
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struct ifconf ifc;
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char buf[UDPMSGSIZE];
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struct ifreq ifreq, *ifr;
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int n;
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ifc.ifc_len = sizeof (buf);
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ifc.ifc_buf = buf;
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if (__ioctl(sock, SIOCGIFCONF, (char *) &ifc) == 0)
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{
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ifr = ifc.ifc_req;
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for (n = ifc.ifc_len / sizeof (struct ifreq); n > 0; n--, ifr++)
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{
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ifreq = *ifr;
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if (__ioctl (sock, SIOCGIFFLAGS, (char *) &ifreq) < 0)
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break;
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if ((ifreq.ifr_flags & IFF_UP)
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&& ifr->ifr_addr.sa_family == AF_INET)
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return 1;
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}
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}
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return 0;
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}
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static enum clnt_stat
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clntudp_call (cl, proc, xargs, argsp, xresults, resultsp, utimeout)
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CLIENT *cl; /* client handle */
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u_long proc; /* procedure number */
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xdrproc_t xargs; /* xdr routine for args */
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caddr_t argsp; /* pointer to args */
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xdrproc_t xresults; /* xdr routine for results */
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caddr_t resultsp; /* pointer to results */
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struct timeval utimeout; /* seconds to wait before giving up */
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{
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struct cu_data *cu = (struct cu_data *) cl->cl_private;
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XDR *xdrs;
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int outlen = 0;
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int inlen;
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socklen_t fromlen;
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struct pollfd fd;
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int milliseconds = (cu->cu_wait.tv_sec * 1000) +
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(cu->cu_wait.tv_usec / 1000);
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struct sockaddr_in from;
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struct rpc_msg reply_msg;
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XDR reply_xdrs;
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struct timeval time_waited;
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bool_t ok;
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int nrefreshes = 2; /* number of times to refresh cred */
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struct timeval timeout;
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int anyup; /* any network interface up */
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if (cu->cu_total.tv_usec == -1)
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{
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timeout = utimeout; /* use supplied timeout */
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}
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else
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{
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timeout = cu->cu_total; /* use default timeout */
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}
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time_waited.tv_sec = 0;
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time_waited.tv_usec = 0;
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call_again:
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xdrs = &(cu->cu_outxdrs);
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if (xargs == NULL)
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goto get_reply;
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xdrs->x_op = XDR_ENCODE;
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XDR_SETPOS (xdrs, cu->cu_xdrpos);
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/*
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* the transaction is the first thing in the out buffer
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*/
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(*(u_short *) (cu->cu_outbuf))++;
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if ((!XDR_PUTLONG (xdrs, (long *) &proc)) ||
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(!AUTH_MARSHALL (cl->cl_auth, xdrs)) ||
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(!(*xargs) (xdrs, argsp)))
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return (cu->cu_error.re_status = RPC_CANTENCODEARGS);
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outlen = (int) XDR_GETPOS (xdrs);
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send_again:
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if (sendto (cu->cu_sock, cu->cu_outbuf, outlen, 0,
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(struct sockaddr *) &(cu->cu_raddr), cu->cu_rlen)
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!= outlen)
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{
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cu->cu_error.re_errno = errno;
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return (cu->cu_error.re_status = RPC_CANTSEND);
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}
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/*
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* Hack to provide rpc-based message passing
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*/
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if (timeout.tv_sec == 0 && timeout.tv_usec == 0)
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{
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return (cu->cu_error.re_status = RPC_TIMEDOUT);
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}
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get_reply:
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/*
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* sub-optimal code appears here because we have
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* some clock time to spare while the packets are in flight.
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* (We assume that this is actually only executed once.)
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*/
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reply_msg.acpted_rply.ar_verf = _null_auth;
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reply_msg.acpted_rply.ar_results.where = resultsp;
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reply_msg.acpted_rply.ar_results.proc = xresults;
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fd.fd = cu->cu_sock;
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fd.events = POLLIN;
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anyup = 0;
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for (;;)
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{
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switch (__poll (&fd, 1, milliseconds))
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{
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case 0:
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if (anyup == 0)
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{
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anyup = is_network_up (cu->cu_sock);
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if (!anyup)
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return (cu->cu_error.re_status = RPC_CANTRECV);
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}
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time_waited.tv_sec += cu->cu_wait.tv_sec;
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time_waited.tv_usec += cu->cu_wait.tv_usec;
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while (time_waited.tv_usec >= 1000000)
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{
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time_waited.tv_sec++;
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time_waited.tv_usec -= 1000000;
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}
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if ((time_waited.tv_sec < timeout.tv_sec) ||
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((time_waited.tv_sec == timeout.tv_sec) &&
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(time_waited.tv_usec < timeout.tv_usec)))
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goto send_again;
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return (cu->cu_error.re_status = RPC_TIMEDOUT);
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/*
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* buggy in other cases because time_waited is not being
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* updated.
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*/
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case -1:
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if (errno == EINTR)
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continue;
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cu->cu_error.re_errno = errno;
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return (cu->cu_error.re_status = RPC_CANTRECV);
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}
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do
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{
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fromlen = sizeof (struct sockaddr);
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inlen = recvfrom (cu->cu_sock, cu->cu_inbuf,
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(int) cu->cu_recvsz, 0,
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(struct sockaddr *) &from, &fromlen);
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}
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while (inlen < 0 && errno == EINTR);
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if (inlen < 0)
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{
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if (errno == EWOULDBLOCK)
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continue;
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cu->cu_error.re_errno = errno;
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return (cu->cu_error.re_status = RPC_CANTRECV);
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}
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if (inlen < 4)
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continue;
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/* see if reply transaction id matches sent id.
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Don't do this if we only wait for a replay */
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if (xargs != NULL
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&& (*((u_int32_t *) (cu->cu_inbuf))
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!= *((u_int32_t *) (cu->cu_outbuf))))
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continue;
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/* we now assume we have the proper reply */
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break;
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}
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/*
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* now decode and validate the response
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*/
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xdrmem_create (&reply_xdrs, cu->cu_inbuf, (u_int) inlen, XDR_DECODE);
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ok = xdr_replymsg (&reply_xdrs, &reply_msg);
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/* XDR_DESTROY(&reply_xdrs); save a few cycles on noop destroy */
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if (ok)
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{
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_seterr_reply (&reply_msg, &(cu->cu_error));
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if (cu->cu_error.re_status == RPC_SUCCESS)
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{
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if (!AUTH_VALIDATE (cl->cl_auth,
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&reply_msg.acpted_rply.ar_verf))
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{
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cu->cu_error.re_status = RPC_AUTHERROR;
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cu->cu_error.re_why = AUTH_INVALIDRESP;
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}
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if (reply_msg.acpted_rply.ar_verf.oa_base != NULL)
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{
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xdrs->x_op = XDR_FREE;
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(void) xdr_opaque_auth (xdrs,
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&(reply_msg.acpted_rply.ar_verf));
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}
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} /* end successful completion */
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else
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{
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/* maybe our credentials need to be refreshed ... */
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if (nrefreshes > 0 && AUTH_REFRESH (cl->cl_auth))
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{
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nrefreshes--;
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goto call_again;
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}
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} /* end of unsuccessful completion */
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} /* end of valid reply message */
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else
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{
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cu->cu_error.re_status = RPC_CANTDECODERES;
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}
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return cu->cu_error.re_status;
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}
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static void
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clntudp_geterr (CLIENT *cl, struct rpc_err *errp)
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{
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struct cu_data *cu = (struct cu_data *) cl->cl_private;
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*errp = cu->cu_error;
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}
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static bool_t
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clntudp_freeres (CLIENT *cl, xdrproc_t xdr_res, caddr_t res_ptr)
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{
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struct cu_data *cu = (struct cu_data *) cl->cl_private;
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XDR *xdrs = &(cu->cu_outxdrs);
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xdrs->x_op = XDR_FREE;
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return (*xdr_res) (xdrs, res_ptr);
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}
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static void
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clntudp_abort (void)
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{
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}
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static bool_t
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clntudp_control (CLIENT *cl, int request, char *info)
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{
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struct cu_data *cu = (struct cu_data *) cl->cl_private;
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switch (request)
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{
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case CLSET_FD_CLOSE:
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cu->cu_closeit = TRUE;
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break;
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case CLSET_FD_NCLOSE:
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cu->cu_closeit = FALSE;
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break;
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case CLSET_TIMEOUT:
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cu->cu_total = *(struct timeval *) info;
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break;
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case CLGET_TIMEOUT:
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*(struct timeval *) info = cu->cu_total;
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break;
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case CLSET_RETRY_TIMEOUT:
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cu->cu_wait = *(struct timeval *) info;
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break;
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case CLGET_RETRY_TIMEOUT:
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*(struct timeval *) info = cu->cu_wait;
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break;
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case CLGET_SERVER_ADDR:
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*(struct sockaddr_in *) info = cu->cu_raddr;
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break;
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case CLGET_FD:
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*(int *)info = cu->cu_sock;
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break;
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case CLGET_XID:
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/*
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* use the knowledge that xid is the
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* first element in the call structure *.
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* This will get the xid of the PREVIOUS call
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*/
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*(u_long *)info = ntohl(*(u_long *)cu->cu_outbuf);
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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));
|
|
}
|