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rt-thread/components/dfs/dfs_v1/filesystems/nfs/rpc/clnt_udp.c

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/*
* Copyright (c) 2006-2021, RT-Thread Development Team
*
* SPDX-License-Identifier: Apache-2.0
*
* Change Logs:
* Date Author Notes
*/
/* @(#)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 <rpc/rpc.h>
#include <rtthread.h>
/*
* UDP bases client side rpc operations
*/
static enum clnt_stat clntudp_call(register CLIENT *cl, /* client handle */
unsigned long proc, /* procedure number */
xdrproc_t xargs, /* xdr routine for args */
char* argsp, /* pointer to args */
xdrproc_t xresults, /* xdr routine for results */
char* resultsp, /* pointer to results */
struct timeval utimeout);
static void clntudp_abort(void);
static void clntudp_geterr(CLIENT *, struct rpc_err *);
static bool_t clntudp_freeres(CLIENT *, xdrproc_t, char*);
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;
unsigned int cu_xdrpos;
unsigned int cu_sendsz;
char *cu_outbuf;
unsigned 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; retransmition 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,
unsigned long program,
unsigned long version,
struct timeval wait,
int *sockp,
unsigned int sendsz,
unsigned int recvsz)
{
CLIENT *cl;
register struct cu_data *cu = NULL;
struct rpc_msg call_msg;
static int xid_count = 0;
cl = (CLIENT *) rt_malloc (sizeof(CLIENT));
if (cl == NULL)
{
rt_kprintf("clntudp_create: out of memory\n");
goto fooy;
}
sendsz = ((sendsz + 3) / 4) * 4;
recvsz = ((recvsz + 3) / 4) * 4;
cu = (struct cu_data *) rt_malloc (sizeof(*cu) + sendsz + recvsz);
if (cu == NULL)
{
rt_kprintf("clntudp_create: out of memory\n");
goto fooy;
}
cu->cu_outbuf = &cu->cu_inbuf[recvsz];
if (raddr->sin_port == 0) {
unsigned short port;
extern unsigned short pmap_getport(struct sockaddr_in *address,
unsigned long program,
unsigned long version,
unsigned int protocol);
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 = (char*) 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 = ((unsigned long)rt_thread_self()) ^ ((unsigned long)rt_tick_get()) ^ (xid_count++);
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)
{
*sockp = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
if (*sockp < 0)
{
rt_kprintf("create socket error\n");
goto fooy;
}
cu->cu_closeit = TRUE;
}
else
{
cu->cu_closeit = FALSE;
}
cu->cu_sock = *sockp;
cl->cl_auth = authnone_create();
return (cl);
fooy:
if (cu) rt_free(cu);
if (cl) rt_free(cl);
return ((CLIENT *) NULL);
}
CLIENT *clntudp_create(struct sockaddr_in *raddr,
unsigned long program,
unsigned long version,
struct timeval wait,
int *sockp)
{
return (clntudp_bufcreate(raddr, program, version, wait, sockp,
UDPMSGSIZE, UDPMSGSIZE));
}
static enum clnt_stat clntudp_call(CLIENT *cl, unsigned long proc,
xdrproc_t xargs, char* argsp,
xdrproc_t xresults, char* resultsp,
struct timeval utimeout)
{
register struct cu_data *cu = (struct cu_data *) cl->cl_private;
register XDR *xdrs;
register int outlen;
register int inlen;
socklen_t fromlen;
struct sockaddr_in from;
struct rpc_msg reply_msg;
XDR reply_xdrs;
bool_t ok;
int nrefreshes = 2; /* number of times to refresh cred */
call_again:
xdrs = &(cu->cu_outxdrs);
xdrs->x_op = XDR_ENCODE;
XDR_SETPOS(xdrs, cu->cu_xdrpos);
/*
* the transaction is the first thing in the out buffer
*/
(*(unsigned long *) (cu->cu_outbuf))++;
if ((!XDR_PUTLONG(xdrs, (long *) &proc)) ||
(!AUTH_MARSHALL(cl->cl_auth, xdrs)) || (!(*xargs) (xdrs, argsp)))
{
cu->cu_error.re_status = RPC_CANTENCODEARGS;
return 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;
cu->cu_error.re_status = RPC_CANTSEND;
return RPC_CANTSEND;
}
/*
* 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;
/* do recv */
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 < 4)
{
rt_kprintf("recv error, len %d\n", inlen);
cu->cu_error.re_errno = errno;
cu->cu_error.re_status = RPC_CANTRECV;
return RPC_CANTRECV;
}
/* see if reply transaction id matches sent id */
if (*((uint32_t *) (cu->cu_inbuf)) != *((uint32_t *) (cu->cu_outbuf)))
goto send_again;
/* we now assume we have the proper reply */
/*
* now decode and validate the response
*/
xdrmem_create(&reply_xdrs, cu->cu_inbuf, (unsigned 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)
{
extern bool_t xdr_opaque_auth(XDR *xdrs, struct opaque_auth *ap);
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 (enum clnt_stat)(cu->cu_error.re_status);
}
static void clntudp_geterr(CLIENT *cl, struct rpc_err *errp)
{
register 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, char* res_ptr)
{
register struct cu_data *cu = (struct cu_data *) cl->cl_private;
register XDR *xdrs = &(cu->cu_outxdrs);
xdrs->x_op = XDR_FREE;
return ((*xdr_res) (xdrs, res_ptr));
}
static void clntudp_abort()
{
}
static bool_t clntudp_control(CLIENT *cl, int request, char *info)
{
register struct cu_data *cu = (struct cu_data *) cl->cl_private;
switch (request)
{
case CLSET_TIMEOUT:
{
int mtimeout;
cu->cu_total = *(struct timeval *) info;
mtimeout = ((cu->cu_total.tv_sec * 1000) + ((cu->cu_total.tv_usec + 500)/1000));
/* set socket option, note: lwip only support msecond timeout */
setsockopt(cu->cu_sock, SOL_SOCKET, SO_RCVTIMEO,
&mtimeout, sizeof(mtimeout));
}
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;
default:
return (FALSE);
}
return (TRUE);
}
static void clntudp_destroy(CLIENT *cl)
{
register struct cu_data *cu = (struct cu_data *) cl->cl_private;
if (cu->cu_closeit)
{
lwip_close(cu->cu_sock);
}
XDR_DESTROY(&(cu->cu_outxdrs));
rt_free(cu);
rt_free(cl);
}
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