1 /* $NetBSD: krpc_subr.c,v 1.12.4.1 1996/06/07 00:52:26 cgd Exp $ */
4 * Copyright (c) 1995 Gordon Ross, Adam Glass
5 * Copyright (c) 1992 Regents of the University of California.
8 * This software was developed by the Computer Systems Engineering group
9 * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and
10 * contributed to Berkeley.
12 * Redistribution and use in source and binary forms, with or without
13 * modification, are permitted provided that the following conditions
15 * 1. Redistributions of source code must retain the above copyright
16 * notice, this list of conditions and the following disclaimer.
17 * 2. Redistributions in binary form must reproduce the above copyright
18 * notice, this list of conditions and the following disclaimer in the
19 * documentation and/or other materials provided with the distribution.
20 * 3. All advertising materials mentioning features or use of this software
21 * must display the following acknowledgement:
22 * This product includes software developed by the University of
23 * California, Lawrence Berkeley Laboratory and its contributors.
24 * 4. Neither the name of the University nor the names of its contributors
25 * may be used to endorse or promote products derived from this software
26 * without specific prior written permission.
28 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
29 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
30 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
31 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
32 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
33 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
34 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
35 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
36 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
37 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
42 * @(#) Header: rpc.c,v 1.12 93/09/28 08:31:56 leres Exp (LBL)
45 #include <sys/cdefs.h>
46 __FBSDID("$FreeBSD$");
48 #include <sys/param.h>
49 #include <sys/systm.h>
51 #include <sys/malloc.h>
54 #include <sys/socket.h>
55 #include <sys/socketvar.h>
61 #include <netinet/in.h>
63 #include <rpc/types.h>
65 #include <rpc/rpc_msg.h>
67 #include <nfs/xdr_subs.h>
70 * Kernel support for Sun RPC
72 * Used currently for bootstrapping in nfs diskless configurations.
80 u_int32_t authtype; /* auth type */
81 u_int32_t authlen; /* auth length */
86 int32_t ua_hostname; /* null */
89 int32_t ua_gidlist; /* null */
93 u_int32_t rp_xid; /* request transaction id */
94 int32_t rp_direction; /* call direction (0) */
95 u_int32_t rp_rpcvers; /* rpc version (2) */
96 u_int32_t rp_prog; /* program */
97 u_int32_t rp_vers; /* version */
98 u_int32_t rp_proc; /* procedure */
99 struct auth_info rpc_auth;
100 struct auth_unix rpc_unix;
101 struct auth_info rpc_verf;
105 u_int32_t rp_xid; /* request transaction id */
106 int32_t rp_direction; /* call direction (1) */
107 int32_t rp_astatus; /* accept status (0: accepted) */
111 struct auth_info rok_auth;
112 u_int32_t rok_status;
116 #define rp_errno rp_u.rpu_errno
117 #define rp_auth rp_u.rpu_rok.rok_auth
118 #define rp_status rp_u.rpu_rok.rok_status
120 #define MIN_REPLY_HDR 16 /* xid, dir, astat, errno */
123 * What is the longest we will wait before re-sending a request?
124 * Note this is also the frequency of "RPC timeout" messages.
125 * The re-send loop count sup linearly to this maximum, so the
126 * first complaint will happen after (1+2+3+4+5)=15 seconds.
128 #define MAX_RESEND_DELAY 5 /* seconds */
131 * Call portmap to lookup a port number for a particular rpc program
132 * Returns non-zero error on failure.
135 krpc_portmap(struct sockaddr_in *sin, u_int prog, u_int vers, u_int16_t *portp,
139 u_int32_t prog; /* call program */
140 u_int32_t vers; /* call version */
141 u_int32_t proto; /* call protocol */
142 u_int32_t port; /* call port (unused) */
151 /* The portmapper port is fixed. */
152 if (prog == PMAPPROG) {
153 *portp = htons(PMAPPORT);
157 m = m_get(M_WAIT, MT_DATA);
158 sdata = mtod(m, struct sdata *);
159 m->m_len = sizeof(*sdata);
161 /* Do the RPC to get it. */
162 sdata->prog = txdr_unsigned(prog);
163 sdata->vers = txdr_unsigned(vers);
164 sdata->proto = txdr_unsigned(IPPROTO_UDP);
167 sin->sin_port = htons(PMAPPORT);
168 error = krpc_call(sin, PMAPPROG, PMAPVERS,
169 PMAPPROC_GETPORT, &m, NULL, td);
173 if (m->m_len < sizeof(*rdata)) {
174 m = m_pullup(m, sizeof(*rdata));
178 rdata = mtod(m, struct rdata *);
179 *portp = rdata->port;
186 * Do a remote procedure call (RPC) and wait for its reply.
187 * If from_p is non-null, then we are doing broadcast, and
188 * the address from whence the response came is saved there.
191 krpc_call(struct sockaddr_in *sa, u_int prog, u_int vers, u_int func,
192 struct mbuf **data, struct sockaddr **from_p, struct thread *td)
195 struct sockaddr_in *sin, ssin;
196 struct sockaddr *from;
197 struct mbuf *m, *nam, *mhead;
198 struct krpc_call *call;
199 struct krpc_reply *reply;
203 int error, rcvflg, timo, secs, len;
204 static u_int32_t xid = ~0xFF;
209 * Validate address family.
210 * Sorry, this is INET specific...
212 if (sa->sin_family != AF_INET)
213 return (EAFNOSUPPORT);
215 /* Free at end if not null. */
220 * Create socket and set its recieve timeout.
222 if ((error = socreate(AF_INET, &so, SOCK_DGRAM, 0, td->td_ucred, td)))
227 bzero(&sopt, sizeof sopt);
228 sopt.sopt_dir = SOPT_SET;
229 sopt.sopt_level = SOL_SOCKET;
230 sopt.sopt_name = SO_RCVTIMEO;
232 sopt.sopt_valsize = sizeof tv;
234 if ((error = sosetopt(so, &sopt)) != 0)
238 * Enable broadcast if necessary.
242 sopt.sopt_name = SO_BROADCAST;
244 sopt.sopt_valsize = sizeof on;
245 if ((error = sosetopt(so, &sopt)) != 0)
250 * Bind the local endpoint to a reserved port,
251 * because some NFS servers refuse requests from
252 * non-reserved (non-privileged) ports.
255 bzero(sin, sizeof *sin);
256 sin->sin_len = sizeof(*sin);
257 sin->sin_family = AF_INET;
258 sin->sin_addr.s_addr = INADDR_ANY;
259 tport = IPPORT_RESERVED;
262 sin->sin_port = htons(tport);
263 error = sobind(so, (struct sockaddr *)sin, td);
264 } while (error == EADDRINUSE &&
265 tport > IPPORT_RESERVED / 2);
267 printf("bind failed\n");
272 * Setup socket address for the server.
276 * Prepend RPC message header.
278 mhead = m_gethdr(M_WAIT, MT_DATA);
279 mhead->m_next = *data;
280 call = mtod(mhead, struct krpc_call *);
281 mhead->m_len = sizeof(*call);
282 bzero((caddr_t)call, sizeof(*call));
285 call->rp_xid = txdr_unsigned(xid);
286 /* call->rp_direction = 0; */
287 call->rp_rpcvers = txdr_unsigned(2);
288 call->rp_prog = txdr_unsigned(prog);
289 call->rp_vers = txdr_unsigned(vers);
290 call->rp_proc = txdr_unsigned(func);
291 /* rpc_auth part (auth_unix as root) */
292 call->rpc_auth.authtype = txdr_unsigned(AUTH_UNIX);
293 call->rpc_auth.authlen = txdr_unsigned(sizeof(struct auth_unix));
294 /* rpc_verf part (auth_null) */
295 call->rpc_verf.authtype = 0;
296 call->rpc_verf.authlen = 0;
299 * Setup packet header
302 mhead->m_pkthdr.rcvif = NULL;
305 * Send it, repeatedly, until a reply is received,
306 * but delay each re-send by an increasing amount.
307 * If the delay hits the maximum, start complaining.
311 /* Send RPC request (or re-send). */
312 m = m_copym(mhead, 0, M_COPYALL, M_WAIT);
313 error = sosend(so, (struct sockaddr *)sa, NULL, m,
316 printf("krpc_call: sosend: %d\n", error);
321 /* Determine new timeout. */
322 if (timo < MAX_RESEND_DELAY)
325 saddr = ntohl(sa->sin_addr.s_addr);
326 printf("RPC timeout for server %d.%d.%d.%d\n",
334 * Wait for up to timo seconds for a reply.
335 * The socket receive timeout was set to 1 second.
340 free(from, M_SONAME);
347 bzero(&auio, sizeof(auio));
348 auio.uio_resid = len = 1<<16;
350 error = soreceive(so, &from, &auio, &m, NULL, &rcvflg);
351 if (error == EWOULDBLOCK) {
357 len -= auio.uio_resid;
359 /* Does the reply contain at least a header? */
360 if (len < MIN_REPLY_HDR)
362 if (m->m_len < MIN_REPLY_HDR)
364 reply = mtod(m, struct krpc_reply *);
366 /* Is it the right reply? */
367 if (reply->rp_direction != txdr_unsigned(REPLY))
370 if (reply->rp_xid != txdr_unsigned(xid))
373 /* Was RPC accepted? (authorization OK) */
374 if (reply->rp_astatus != 0) {
375 error = fxdr_unsigned(u_int32_t, reply->rp_errno);
376 printf("rpc denied, error=%d\n", error);
380 /* Did the call succeed? */
381 if (reply->rp_status != 0) {
382 error = fxdr_unsigned(u_int32_t, reply->rp_status);
383 if (error == PROG_MISMATCH) {
387 printf("rpc denied, status=%d\n", error);
391 goto gotreply; /* break two levels */
394 } /* forever send/receive */
402 * Get RPC reply header into first mbuf,
403 * get its length, then strip it off.
405 len = sizeof(*reply);
406 if (m->m_len < len) {
407 m = m_pullup(m, len);
413 reply = mtod(m, struct krpc_reply *);
414 if (reply->rp_auth.authtype != 0) {
415 len += fxdr_unsigned(u_int32_t, reply->rp_auth.authlen);
416 len = (len + 3) & ~3; /* XXX? */
428 if (mhead) m_freem(mhead);
429 if (from) free(from, M_SONAME);
435 * eXternal Data Representation routines.
436 * (but with non-standard args...)
440 * String representation for RPC.
443 u_int32_t len; /* length without null or padding */
444 char data[4]; /* data (longer, of course) */
445 /* data is padded to a long-word boundary */
449 xdr_string_encode(char *str, int len)
452 struct xdr_string *xs;
453 int dlen; /* padded string length */
454 int mlen; /* message length */
456 dlen = (len + 3) & ~3;
459 if (mlen > MCLBYTES) /* If too big, we just can't do it. */
462 m = m_get(M_WAIT, MT_DATA);
465 xs = mtod(m, struct xdr_string *);
467 xs->len = txdr_unsigned(len);
468 bcopy(str, xs->data, len);