NetBSD/sys/lib/libsa/rpc.c

252 lines
6.8 KiB
C

/*
* Copyright (c) 1992 Regents of the University of California.
* All rights reserved.
*
* This software was developed by the Computer Systems Engineering group
* at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and
* contributed to Berkeley.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Lawrence Berkeley Laboratory and its contributors.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* from @(#) Header: rpc.c,v 1.12 93/09/28 08:31:56 leres Exp (LBL)
* $Id: rpc.c,v 1.1 1994/05/08 16:11:35 brezak Exp $
*/
#include <sys/param.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netinet/in_systm.h>
#include <nfs/rpcv2.h>
#include <nfs/nfsv2.h>
#undef NFSX_FATTR
#include <string.h>
#include "stand.h"
#include "net.h"
#include "netif.h"
#include "rpc.h"
/* XXX Data part of nfs rpc reply (also the largest thing we receive) */
struct nfs_reply_data {
u_long errno;
#ifndef NFSX_FATTR
struct nfsv2_fattr fa;
#else
u_char fa[NFSX_FATTR(0)];
#endif
u_long count;
u_char data[1200];
};
#define NFSREAD_SIZE sizeof(((struct nfs_reply_data *)0)->data)
/* Cache stuff */
#define PMAP_NUM 8 /* need at most 5 pmap entries */
static struct pmap_list {
u_long addr; /* address of server */
u_long prog;
u_long vers;
u_short port; /* cached port for service */
} pmap_list[PMAP_NUM] = {
{ 0, PMAPPROG, PMAPVERS, PMAPPORT }
};
static int pmap_num = 1;
/* Local forwards */
static int recvrpc __P((struct iodesc *, void *, int));
/* Make a rpc call; return length of answer */
int
callrpc(d, prog, vers, proc, sdata, slen, rdata, rlen)
register struct iodesc *d;
register u_long prog, vers, proc;
register void *sdata;
register int slen;
register void *rdata;
register int rlen;
{
register int cc;
register struct rpc_call *rpc;
struct {
u_char header[HEADER_SIZE];
struct rpc_call wrpc;
u_char data[sizeof(struct nfs_reply_data)]; /* XXX */
} wbuf;
struct {
u_char header[HEADER_SIZE];
struct rpc_reply rrpc;
union {
u_long errno;
u_char data[sizeof(struct nfs_reply_data)];
} ru;
} rbuf;
#ifdef RPC_DEBUG
if (debug)
printf("callrpc: called\n");
#endif
if (rlen > sizeof(rbuf.ru.data))
panic("callrpc: huge read (%d > %d)",
rlen, sizeof(rbuf.ru.data));
d->destport = getport(d, prog, vers);
rpc = &wbuf.wrpc;
bzero(rpc, sizeof(*rpc));
rpc->rp_xid = d->xid;
rpc->rp_rpcvers = htonl(RPC_MSG_VERSION);
rpc->rp_prog = htonl(prog);
rpc->rp_vers = htonl(vers);
rpc->rp_proc = htonl(proc);
bcopy(sdata, wbuf.data, slen);
cc = sendrecv(d, sendudp, rpc, sizeof(*rpc) + slen, recvrpc,
((u_char *)&rbuf.rrpc) - HEADER_SIZE, sizeof(rbuf) - HEADER_SIZE);
if (cc < rlen) {
/* Check for an error return */
if (cc >= sizeof(rbuf.ru.errno) && rbuf.ru.errno != 0) {
errno = ntohl(rbuf.ru.errno);
return (-1);
}
panic("callrpc: missing data (%d < %d)", cc, rlen);
}
if (cc > sizeof(rbuf.ru.data))
panic("callrpc: huge return (%d > %d)",
cc, sizeof(rbuf.ru.data));
bcopy(rbuf.ru.data, rdata, cc);
return (cc);
}
/* Returns true if packet is the one we're waiting for */
static int
recvrpc(d, pkt, len)
register struct iodesc *d;
register void *pkt;
int len;
{
register struct rpc_reply *rpc;
errno = 0;
#ifdef RPC_DEBUG
if (debug)
printf("recvrpc: called\n");
#endif
rpc = (struct rpc_reply *)checkudp(d, pkt, &len);
if (rpc == NULL || len < sizeof(*rpc)) {
#ifdef RPC_DEBUG
if (debug)
printf("recvrpc: bad response rpc=%x len=%d\n",
(u_int)rpc, len);
#endif
return (-1);
}
NTOHL(rpc->rp_direction);
NTOHL(rpc->rp_stat);
if (rpc->rp_xid != d->xid || rpc->rp_direction != REPLY ||
rpc->rp_stat != MSG_ACCEPTED) {
#ifdef RPC_DEBUG
if (debug) {
if (rpc->rp_xid != d->xid)
printf("recvrpc: rp_xid %d != xid %d\n",
rpc->rp_xid, d->xid);
if (rpc->rp_direction != REPLY)
printf("recvrpc: %d != REPLY\n", rpc->rp_direction);
if (rpc->rp_stat != MSG_ACCEPTED)
printf("recvrpc: %d != MSG_ACCEPTED\n", rpc->rp_stat);
}
#endif
return (-1);
}
/* Bump xid so next request will be unique */
++d->xid;
/* Return data count (thus indicating success) */
return (len - sizeof(*rpc));
}
/* Request a port number from the port mapper */
u_short
getport(d, prog, vers)
register struct iodesc *d;
u_long prog;
u_long vers;
{
register int i;
register struct pmap_list *pl;
u_long port;
struct {
u_long prog; /* call program */
u_long vers; /* call version */
u_long proto; /* call protocol */
u_long port; /* call port (unused) */
} sdata;
#ifdef RPC_DEBUG
if (debug)
printf("getport: called\n");
#endif
/* Try for cached answer first */
for (i = 0, pl = pmap_list; i < pmap_num; ++i, ++pl)
if ((pl->addr == d->destip || pl->addr == 0) &&
pl->prog == prog && pl->vers == vers)
return (pl->port);
/* Don't overflow cache */
if (pmap_num > PMAP_NUM - 1)
panic("getport: overflowed pmap_list!");
sdata.prog = htonl(prog);
sdata.vers = htonl(vers);
sdata.proto = htonl(IPPROTO_UDP);
sdata.port = 0;
if (callrpc(d, PMAPPROG, PMAPVERS, PMAPPROC_GETPORT,
&sdata, sizeof(sdata), &port, sizeof(port)) < 0) {
printf("getport: %s", strerror(errno));
return(-1);
}
/* Cache answer */
pl->addr = d->destip;
pl->prog = prog;
pl->vers = vers;
pl->port = port;
++pmap_num;
return ((u_short)port);
}