405 lines
12 KiB
C
405 lines
12 KiB
C
/*
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* Copyright (c) 2006-2021, RT-Thread Development Team
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*
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* SPDX-License-Identifier: Apache-2.0
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*
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* Change Logs:
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* Date Author Notes
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*/
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/* @(#)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 <rpc/rpc.h>
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#include <rtthread.h>
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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(register CLIENT *cl, /* client handle */
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unsigned long proc, /* procedure number */
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xdrproc_t xargs, /* xdr routine for args */
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char* argsp, /* pointer to args */
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xdrproc_t xresults, /* xdr routine for results */
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char* resultsp, /* pointer to results */
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struct timeval utimeout);
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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, char*);
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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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unsigned int cu_xdrpos;
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unsigned int cu_sendsz;
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char *cu_outbuf;
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unsigned 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; retransmition 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 *clntudp_bufcreate(struct sockaddr_in *raddr,
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unsigned long program,
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unsigned long version,
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struct timeval wait,
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int *sockp,
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unsigned int sendsz,
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unsigned int recvsz)
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{
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CLIENT *cl;
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register struct cu_data *cu = NULL;
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struct rpc_msg call_msg;
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static int xid_count = 0;
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cl = (CLIENT *) rt_malloc (sizeof(CLIENT));
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if (cl == NULL)
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{
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rt_kprintf("clntudp_create: out of memory\n");
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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 *) rt_malloc (sizeof(*cu) + sendsz + recvsz);
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if (cu == NULL)
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{
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rt_kprintf("clntudp_create: out of memory\n");
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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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unsigned short port;
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extern unsigned short pmap_getport(struct sockaddr_in *address,
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unsigned long program,
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unsigned long version,
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unsigned int protocol);
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if ((port =
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pmap_getport(raddr, program, version, IPPROTO_UDP)) == 0) {
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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 = (char*) 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 = ((unsigned long)rt_thread_self()) ^ ((unsigned long)rt_tick_get()) ^ (xid_count++);
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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, 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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*sockp = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
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if (*sockp < 0)
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{
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rt_kprintf("create socket error\n");
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goto fooy;
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}
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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) rt_free(cu);
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if (cl) rt_free(cl);
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return ((CLIENT *) NULL);
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}
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CLIENT *clntudp_create(struct sockaddr_in *raddr,
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unsigned long program,
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unsigned 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 enum clnt_stat clntudp_call(CLIENT *cl, unsigned long proc,
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xdrproc_t xargs, char* argsp,
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xdrproc_t xresults, char* resultsp,
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struct timeval utimeout)
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{
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register struct cu_data *cu = (struct cu_data *) cl->cl_private;
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register XDR *xdrs;
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register int outlen;
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register int inlen;
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socklen_t fromlen;
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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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bool_t ok;
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int nrefreshes = 2; /* number of times to refresh cred */
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call_again:
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xdrs = &(cu->cu_outxdrs);
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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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(*(unsigned long *) (cu->cu_outbuf))++;
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if ((!XDR_PUTLONG(xdrs, (long *) &proc)) ||
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(!AUTH_MARSHALL(cl->cl_auth, xdrs)) || (!(*xargs) (xdrs, argsp)))
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{
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cu->cu_error.re_status = RPC_CANTENCODEARGS;
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return RPC_CANTENCODEARGS;
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}
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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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cu->cu_error.re_status = RPC_CANTSEND;
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return RPC_CANTSEND;
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}
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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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/* do recv */
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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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}while (inlen < 0 && errno == EINTR);
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if (inlen < 4)
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{
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rt_kprintf("recv error, len %d\n", inlen);
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cu->cu_error.re_errno = errno;
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cu->cu_error.re_status = RPC_CANTRECV;
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return RPC_CANTRECV;
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}
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/* see if reply transaction id matches sent id */
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if (*((uint32_t *) (cu->cu_inbuf)) != *((uint32_t *) (cu->cu_outbuf)))
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goto send_again;
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/* we now assume we have the proper reply */
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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, (unsigned 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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extern bool_t xdr_opaque_auth(XDR *xdrs, struct opaque_auth *ap);
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xdrs->x_op = XDR_FREE;
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(void) xdr_opaque_auth(xdrs, &(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 (enum clnt_stat)(cu->cu_error.re_status);
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}
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static void clntudp_geterr(CLIENT *cl, struct rpc_err *errp)
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{
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register 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 clntudp_freeres(CLIENT *cl, xdrproc_t xdr_res, char* res_ptr)
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{
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register struct cu_data *cu = (struct cu_data *) cl->cl_private;
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register 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 clntudp_abort()
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{
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}
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static bool_t clntudp_control(CLIENT *cl, int request, char *info)
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{
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register 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_TIMEOUT:
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{
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int mtimeout;
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cu->cu_total = *(struct timeval *) info;
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mtimeout = ((cu->cu_total.tv_sec * 1000) + ((cu->cu_total.tv_usec + 500)/1000));
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/* set socket option, note: lwip only support msecond timeout */
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setsockopt(cu->cu_sock, SOL_SOCKET, SO_RCVTIMEO,
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&mtimeout, sizeof(mtimeout));
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}
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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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default:
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return (FALSE);
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}
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return (TRUE);
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}
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static void clntudp_destroy(CLIENT *cl)
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{
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register struct cu_data *cu = (struct cu_data *) cl->cl_private;
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if (cu->cu_closeit)
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{
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lwip_close(cu->cu_sock);
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}
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XDR_DESTROY(&(cu->cu_outxdrs));
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rt_free(cu);
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rt_free(cl);
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}
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