summaryrefslogtreecommitdiff
path: root/sys/lib/libsa/rpc.c
blob: 63c284cbb004e4dc9f42e9be6bd229e33644550e (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
/*	$NetBSD: rpc.c,v 1.4 1995/02/20 11:04:18 mycroft Exp $	*/

/*
 * 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.
 *
 * @(#) Header: rpc.c,v 1.12 93/09/28 08:31:56 leres Exp  (LBL)
 */

#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>
#include <nfs/xdr_subs.h>

#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;
	u_char	fa[NFSX_FATTR(0)];
	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	size_t recvrpc __P((struct iodesc *, void *, size_t, time_t));

/* Make a rpc call; return length of answer */
size_t
callrpc(d, prog, vers, proc, sdata, slen, rdata, rlen)
	register struct iodesc *d;
	register u_long prog, vers, proc;
	register void *sdata;
	register size_t slen;
	register void *rdata;
	register size_t rlen;
{
	register size_t cc;
	register u_long *tl;
	struct {
		u_char	header[HEADER_SIZE];
		u_long	data[96];	/* 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);

	tl = wbuf.data;

	/* Fill in RPC call structure. */
	*tl++ = txdr_unsigned(d->xid);
	*tl++ = txdr_unsigned(RPC_CALL);
	*tl++ = txdr_unsigned(RPC_VER2);
	*tl++ = txdr_unsigned(prog);
	*tl++ = txdr_unsigned(vers);
	*tl++ = txdr_unsigned(proc);

	/* Fill in authorization info. */
	if (prog != NFS_PROG) {
		*tl++ = txdr_unsigned(RPCAUTH_NULL);
		*tl++ = txdr_unsigned(0);
	} else {
		*tl++ = txdr_unsigned(RPCAUTH_UNIX);
		*tl++ = txdr_unsigned(3*NFSX_UNSIGNED);
		*tl++ = txdr_unsigned(0);	/* time */
		*tl++ = txdr_unsigned(0);	/* host name length */
		*tl++ = txdr_unsigned(0);	/* uid */
		*tl++ = txdr_unsigned(0);	/* gid */
		*tl++ = txdr_unsigned(0);	/* gid list length */
	}
	*tl++ = txdr_unsigned(RPCAUTH_NULL);
	*tl++ = txdr_unsigned(0);

	/* Fill in RPC call arguments. */
	bcopy(sdata, tl, slen);

	cc = sendrecv(d,
	    sendudp, wbuf.data,
	    (tl - wbuf.data) * NFSX_UNSIGNED + slen,
	    recvrpc, &rbuf.rrpc,
	    sizeof(struct rpc_reply) + sizeof(struct nfs_reply_data));

#ifdef RPC_DEBUG
	if (debug)
		printf("callrpc: cc=%d rlen=%d, rp_stat=%d\n", cc, rlen,
		    rbuf.rrpc.rp_stat);
#endif

	/* Bump xid so next request will be unique. */
	++d->xid;

	if (cc == -1)
		return (-1);
	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 size_t
recvrpc(d, pkt, len, tleft)
	register struct iodesc *d;
	register void *pkt;
	register size_t len;
	time_t tleft;
{
	register struct rpc_reply *rpc;

	errno = 0;
#ifdef RPC_DEBUG
	if (debug)
		printf("recvrpc: called len=%d\n", len);
#endif

	len = readudp(d, pkt, len, tleft);
	if (len == -1 || len < sizeof(struct rpc_reply))
		goto bad;

	rpc = (struct rpc_reply *)pkt;
	NTOHL(rpc->rp_xid);
	NTOHL(rpc->rp_direction);
	NTOHL(rpc->rp_stat);

	if (rpc->rp_xid != d->xid ||
	    rpc->rp_direction != RPC_REPLY ||
	    rpc->rp_stat != RPC_MSGACCEPTED) {
#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 != RPC_REPLY)
				printf("recvrpc: rp_direction %d != RPC_REPLY\n",
				    rpc->rp_direction);
			if (rpc->rp_stat != RPC_MSGACCEPTED)
				printf("recvrpc: rp_stat %d != RPC_MSGACCEPTED\n",
				    rpc->rp_stat);
		}
#endif
		goto bad;
	}

	/* Return data count (thus indicating success) */
	return (len - sizeof(*rpc));

bad:
	return (-1);
}

/* 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);
}