1 /* $NetBSD: krpc_subr.c,v 1.12.4.1 1996/06/07 00:52:26 cgd Exp $ */
4 * SPDX-License-Identifier: BSD-4-Clause
6 * Copyright (c) 1995 Gordon Ross, Adam Glass
7 * Copyright (c) 1992 Regents of the University of California.
10 * This software was developed by the Computer Systems Engineering group
11 * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and
12 * contributed to Berkeley.
14 * Redistribution and use in source and binary forms, with or without
15 * modification, are permitted provided that the following conditions
17 * 1. Redistributions of source code must retain the above copyright
18 * notice, this list of conditions and the following disclaimer.
19 * 2. Redistributions in binary form must reproduce the above copyright
20 * notice, this list of conditions and the following disclaimer in the
21 * documentation and/or other materials provided with the distribution.
22 * 3. All advertising materials mentioning features or use of this software
23 * must display the following acknowledgement:
24 * This product includes software developed by the University of
25 * California, Lawrence Berkeley Laboratory and its contributors.
26 * 4. Neither the name of the University nor the names of its contributors
27 * may be used to endorse or promote products derived from this software
28 * without specific prior written permission.
30 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
31 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
32 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
33 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
34 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
35 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
36 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
37 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
38 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
39 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
44 * @(#) Header: rpc.c,v 1.12 93/09/28 08:31:56 leres Exp (LBL)
47 #include <sys/cdefs.h>
48 __FBSDID("$FreeBSD$");
50 #include <sys/param.h>
51 #include <sys/systm.h>
53 #include <sys/malloc.h>
56 #include <sys/socket.h>
57 #include <sys/socketvar.h>
63 #include <netinet/in.h>
65 #include <rpc/types.h>
67 #include <rpc/rpc_msg.h>
69 #include <nfs/xdr_subs.h>
72 * Kernel support for Sun RPC
74 * Used currently for bootstrapping in nfs diskless configurations.
82 u_int32_t authtype; /* auth type */
83 u_int32_t authlen; /* auth length */
88 int32_t ua_hostname; /* null */
91 int32_t ua_gidlist; /* null */
95 u_int32_t rp_xid; /* request transaction id */
96 int32_t rp_direction; /* call direction (0) */
97 u_int32_t rp_rpcvers; /* rpc version (2) */
98 u_int32_t rp_prog; /* program */
99 u_int32_t rp_vers; /* version */
100 u_int32_t rp_proc; /* procedure */
101 struct auth_info rpc_auth;
102 struct auth_unix rpc_unix;
103 struct auth_info rpc_verf;
107 u_int32_t rp_xid; /* request transaction id */
108 int32_t rp_direction; /* call direction (1) */
109 int32_t rp_astatus; /* accept status (0: accepted) */
113 struct auth_info rok_auth;
114 u_int32_t rok_status;
118 #define rp_errno rp_u.rpu_errno
119 #define rp_auth rp_u.rpu_rok.rok_auth
120 #define rp_status rp_u.rpu_rok.rok_status
122 #define MIN_REPLY_HDR 16 /* xid, dir, astat, errno */
125 * What is the longest we will wait before re-sending a request?
126 * Note this is also the frequency of "RPC timeout" messages.
127 * The re-send loop count sup linearly to this maximum, so the
128 * first complaint will happen after (1+2+3+4+5)=15 seconds.
130 #define MAX_RESEND_DELAY 5 /* seconds */
133 * Call portmap to lookup a port number for a particular rpc program
134 * Returns non-zero error on failure.
137 krpc_portmap(struct sockaddr_in *sin, u_int prog, u_int vers, u_int16_t *portp,
141 u_int32_t prog; /* call program */
142 u_int32_t vers; /* call version */
143 u_int32_t proto; /* call protocol */
144 u_int32_t port; /* call port (unused) */
153 /* The portmapper port is fixed. */
154 if (prog == PMAPPROG) {
155 *portp = htons(PMAPPORT);
159 m = m_get(M_WAITOK, MT_DATA);
160 sdata = mtod(m, struct sdata *);
161 m->m_len = sizeof(*sdata);
163 /* Do the RPC to get it. */
164 sdata->prog = txdr_unsigned(prog);
165 sdata->vers = txdr_unsigned(vers);
166 sdata->proto = txdr_unsigned(IPPROTO_UDP);
169 sin->sin_port = htons(PMAPPORT);
170 error = krpc_call(sin, PMAPPROG, PMAPVERS,
171 PMAPPROC_GETPORT, &m, NULL, td);
175 if (m->m_len < sizeof(*rdata)) {
176 m = m_pullup(m, sizeof(*rdata));
180 rdata = mtod(m, struct rdata *);
181 *portp = rdata->port;
188 * Do a remote procedure call (RPC) and wait for its reply.
189 * If from_p is non-null, then we are doing broadcast, and
190 * the address from whence the response came is saved there.
193 krpc_call(struct sockaddr_in *sa, u_int prog, u_int vers, u_int func,
194 struct mbuf **data, struct sockaddr **from_p, struct thread *td)
197 struct sockaddr_in *sin, ssin;
198 struct sockaddr *from;
199 struct mbuf *m, *nam, *mhead;
200 struct krpc_call *call;
201 struct krpc_reply *reply;
205 int error, rcvflg, timo, secs, len;
206 static u_int32_t xid = ~0xFF;
211 * Validate address family.
212 * Sorry, this is INET specific...
214 if (sa->sin_family != AF_INET)
215 return (EAFNOSUPPORT);
217 /* Free at end if not null. */
222 * Create socket and set its receive timeout.
224 if ((error = socreate(AF_INET, &so, SOCK_DGRAM, 0, td->td_ucred, td)))
229 bzero(&sopt, sizeof sopt);
230 sopt.sopt_dir = SOPT_SET;
231 sopt.sopt_level = SOL_SOCKET;
232 sopt.sopt_name = SO_RCVTIMEO;
234 sopt.sopt_valsize = sizeof tv;
236 if ((error = sosetopt(so, &sopt)) != 0)
240 * Enable broadcast if necessary.
244 sopt.sopt_name = SO_BROADCAST;
246 sopt.sopt_valsize = sizeof on;
247 if ((error = sosetopt(so, &sopt)) != 0)
252 * Bind the local endpoint to a reserved port,
253 * because some NFS servers refuse requests from
254 * non-reserved (non-privileged) ports.
257 bzero(sin, sizeof *sin);
258 sin->sin_len = sizeof(*sin);
259 sin->sin_family = AF_INET;
260 sin->sin_addr.s_addr = INADDR_ANY;
261 tport = IPPORT_RESERVED;
264 sin->sin_port = htons(tport);
265 error = sobind(so, (struct sockaddr *)sin, td);
266 } while (error == EADDRINUSE &&
267 tport > IPPORT_RESERVED / 2);
269 printf("bind failed\n");
274 * Setup socket address for the server.
278 * Prepend RPC message header.
280 mhead = m_gethdr(M_WAITOK, MT_DATA);
281 mhead->m_next = *data;
282 call = mtod(mhead, struct krpc_call *);
283 mhead->m_len = sizeof(*call);
284 bzero((caddr_t)call, sizeof(*call));
287 call->rp_xid = txdr_unsigned(xid);
288 /* call->rp_direction = 0; */
289 call->rp_rpcvers = txdr_unsigned(2);
290 call->rp_prog = txdr_unsigned(prog);
291 call->rp_vers = txdr_unsigned(vers);
292 call->rp_proc = txdr_unsigned(func);
293 /* rpc_auth part (auth_unix as root) */
294 call->rpc_auth.authtype = txdr_unsigned(AUTH_UNIX);
295 call->rpc_auth.authlen = txdr_unsigned(sizeof(struct auth_unix));
296 /* rpc_verf part (auth_null) */
297 call->rpc_verf.authtype = 0;
298 call->rpc_verf.authlen = 0;
301 * Setup packet header
304 mhead->m_pkthdr.rcvif = NULL;
307 * Send it, repeatedly, until a reply is received,
308 * but delay each re-send by an increasing amount.
309 * If the delay hits the maximum, start complaining.
313 /* Send RPC request (or re-send). */
314 m = m_copym(mhead, 0, M_COPYALL, M_WAITOK);
315 error = sosend(so, (struct sockaddr *)sa, NULL, m,
318 printf("krpc_call: sosend: %d\n", error);
323 /* Determine new timeout. */
324 if (timo < MAX_RESEND_DELAY)
327 saddr = ntohl(sa->sin_addr.s_addr);
328 printf("RPC timeout for server %d.%d.%d.%d\n",
336 * Wait for up to timo seconds for a reply.
337 * The socket receive timeout was set to 1 second.
342 free(from, M_SONAME);
349 bzero(&auio, sizeof(auio));
350 auio.uio_resid = len = 1<<16;
352 error = soreceive(so, &from, &auio, &m, NULL, &rcvflg);
353 if (error == EWOULDBLOCK) {
359 len -= auio.uio_resid;
361 /* Does the reply contain at least a header? */
362 if (len < MIN_REPLY_HDR)
364 if (m->m_len < MIN_REPLY_HDR)
366 reply = mtod(m, struct krpc_reply *);
368 /* Is it the right reply? */
369 if (reply->rp_direction != txdr_unsigned(REPLY))
372 if (reply->rp_xid != txdr_unsigned(xid))
375 /* Was RPC accepted? (authorization OK) */
376 if (reply->rp_astatus != 0) {
377 error = fxdr_unsigned(u_int32_t, reply->rp_errno);
378 printf("rpc denied, error=%d\n", error);
382 /* Did the call succeed? */
383 if (reply->rp_status != 0) {
384 error = fxdr_unsigned(u_int32_t, reply->rp_status);
385 if (error == PROG_MISMATCH) {
389 printf("rpc denied, status=%d\n", error);
393 goto gotreply; /* break two levels */
396 } /* forever send/receive */
404 * Get RPC reply header into first mbuf,
405 * get its length, then strip it off.
407 len = sizeof(*reply);
408 if (m->m_len < len) {
409 m = m_pullup(m, len);
415 reply = mtod(m, struct krpc_reply *);
416 if (reply->rp_auth.authtype != 0) {
417 len += fxdr_unsigned(u_int32_t, reply->rp_auth.authlen);
418 len = (len + 3) & ~3; /* XXX? */
430 if (mhead) m_freem(mhead);
431 if (from) free(from, M_SONAME);
437 * eXternal Data Representation routines.
438 * (but with non-standard args...)
442 * String representation for RPC.
445 u_int32_t len; /* length without null or padding */
446 char data[4]; /* data (longer, of course) */
447 /* data is padded to a long-word boundary */
451 xdr_string_encode(char *str, int len)
454 struct xdr_string *xs;
455 int dlen; /* padded string length */
456 int mlen; /* message length */
458 dlen = (len + 3) & ~3;
461 if (mlen > MCLBYTES) /* If too big, we just can't do it. */
464 m = m_get2(mlen, M_WAITOK, MT_DATA, 0);
465 xs = mtod(m, struct xdr_string *);
467 xs->len = txdr_unsigned(len);
468 bcopy(str, xs->data, len);