1 /* $NetBSD: krpc_subr.c,v 1.12.4.1 1996/06/07 00:52:26 cgd Exp $ */
2
3 /*-
4 * Copyright (c) 1995 Gordon Ross, Adam Glass
5 * Copyright (c) 1992 Regents of the University of California.
6 * All rights reserved.
7 *
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.
11 *
12 * Redistribution and use in source and binary forms, with or without
13 * modification, are permitted provided that the following conditions
14 * are met:
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.
27 *
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
38 * SUCH DAMAGE.
39 *
40 * partially based on:
41 * libnetboot/rpc.c
42 * @(#) Header: rpc.c,v 1.12 93/09/28 08:31:56 leres Exp (LBL)
43 */
44
45 #include <sys/cdefs.h>
46 __FBSDID("$FreeBSD: releng/5.4/sys/nfsclient/krpc_subr.c 141090 2005-01-31 23:27:04Z imp $");
47
48 #include <sys/param.h>
49 #include <sys/systm.h>
50 #include <sys/malloc.h>
51 #include <sys/mbuf.h>
52 #include <sys/proc.h>
53 #include <sys/socket.h>
54 #include <sys/socketvar.h>
55 #include <sys/uio.h>
56
57 #include <net/if.h>
58 #include <netinet/in.h>
59
60 #include <rpc/rpcclnt.h>
61
62 #include <nfs/rpcv2.h>
63 #include <nfsclient/krpc.h>
64 #include <nfs/xdr_subs.h>
65
66 /*
67 * Kernel support for Sun RPC
68 *
69 * Used currently for bootstrapping in nfs diskless configurations.
70 */
71
72 /*
73 * Generic RPC headers
74 */
75
76 struct auth_info {
77 u_int32_t authtype; /* auth type */
78 u_int32_t authlen; /* auth length */
79 };
80
81 struct auth_unix {
82 int32_t ua_time;
83 int32_t ua_hostname; /* null */
84 int32_t ua_uid;
85 int32_t ua_gid;
86 int32_t ua_gidlist; /* null */
87 };
88
89 struct krpc_call {
90 u_int32_t rp_xid; /* request transaction id */
91 int32_t rp_direction; /* call direction (0) */
92 u_int32_t rp_rpcvers; /* rpc version (2) */
93 u_int32_t rp_prog; /* program */
94 u_int32_t rp_vers; /* version */
95 u_int32_t rp_proc; /* procedure */
96 struct auth_info rpc_auth;
97 struct auth_unix rpc_unix;
98 struct auth_info rpc_verf;
99 };
100
101 struct krpc_reply {
102 u_int32_t rp_xid; /* request transaction id */
103 int32_t rp_direction; /* call direction (1) */
104 int32_t rp_astatus; /* accept status (0: accepted) */
105 union {
106 u_int32_t rpu_errno;
107 struct {
108 struct auth_info rok_auth;
109 u_int32_t rok_status;
110 } rpu_rok;
111 } rp_u;
112 };
113 #define rp_errno rp_u.rpu_errno
114 #define rp_auth rp_u.rpu_rok.rok_auth
115 #define rp_status rp_u.rpu_rok.rok_status
116
117 #define MIN_REPLY_HDR 16 /* xid, dir, astat, errno */
118
119 /*
120 * What is the longest we will wait before re-sending a request?
121 * Note this is also the frequency of "RPC timeout" messages.
122 * The re-send loop count sup linearly to this maximum, so the
123 * first complaint will happen after (1+2+3+4+5)=15 seconds.
124 */
125 #define MAX_RESEND_DELAY 5 /* seconds */
126
127 /*
128 * Call portmap to lookup a port number for a particular rpc program
129 * Returns non-zero error on failure.
130 */
131 int
132 krpc_portmap(struct sockaddr_in *sin, u_int prog, u_int vers, u_int16_t *portp,
133 struct thread *td)
134 {
135 struct sdata {
136 u_int32_t prog; /* call program */
137 u_int32_t vers; /* call version */
138 u_int32_t proto; /* call protocol */
139 u_int32_t port; /* call port (unused) */
140 } *sdata;
141 struct rdata {
142 u_int16_t pad;
143 u_int16_t port;
144 } *rdata;
145 struct mbuf *m;
146 int error;
147
148 /* The portmapper port is fixed. */
149 if (prog == PMAPPROG) {
150 *portp = htons(PMAPPORT);
151 return 0;
152 }
153
154 m = m_get(M_TRYWAIT, MT_DATA);
155 if (m == NULL)
156 return ENOBUFS;
157 sdata = mtod(m, struct sdata *);
158 m->m_len = sizeof(*sdata);
159
160 /* Do the RPC to get it. */
161 sdata->prog = txdr_unsigned(prog);
162 sdata->vers = txdr_unsigned(vers);
163 sdata->proto = txdr_unsigned(IPPROTO_UDP);
164 sdata->port = 0;
165
166 sin->sin_port = htons(PMAPPORT);
167 error = krpc_call(sin, PMAPPROG, PMAPVERS,
168 PMAPPROC_GETPORT, &m, NULL, td);
169 if (error)
170 return error;
171
172 if (m->m_len < sizeof(*rdata)) {
173 m = m_pullup(m, sizeof(*rdata));
174 if (m == NULL)
175 return ENOBUFS;
176 }
177 rdata = mtod(m, struct rdata *);
178 *portp = rdata->port;
179
180 m_freem(m);
181 return 0;
182 }
183
184 /*
185 * Do a remote procedure call (RPC) and wait for its reply.
186 * If from_p is non-null, then we are doing broadcast, and
187 * the address from whence the response came is saved there.
188 */
189 int
190 krpc_call(struct sockaddr_in *sa, u_int prog, u_int vers, u_int func,
191 struct mbuf **data, struct sockaddr **from_p, struct thread *td)
192 {
193 struct socket *so;
194 struct sockaddr_in *sin, ssin;
195 struct sockaddr *from;
196 struct mbuf *m, *nam, *mhead;
197 struct krpc_call *call;
198 struct krpc_reply *reply;
199 struct sockopt sopt;
200 struct timeval tv;
201 struct uio auio;
202 int error, rcvflg, timo, secs, len;
203 static u_int32_t xid = ~0xFF;
204 u_int16_t tport;
205 u_int32_t saddr;
206
207 /*
208 * Validate address family.
209 * Sorry, this is INET specific...
210 */
211 if (sa->sin_family != AF_INET)
212 return (EAFNOSUPPORT);
213
214 /* Free at end if not null. */
215 nam = mhead = NULL;
216 from = NULL;
217
218 NET_ASSERT_GIANT();
219
220 /*
221 * Create socket and set its recieve timeout.
222 */
223 if ((error = socreate(AF_INET, &so, SOCK_DGRAM, 0, td->td_ucred, td)))
224 goto out;
225
226 tv.tv_sec = 1;
227 tv.tv_usec = 0;
228 bzero(&sopt, sizeof sopt);
229 sopt.sopt_dir = SOPT_SET;
230 sopt.sopt_level = SOL_SOCKET;
231 sopt.sopt_name = SO_RCVTIMEO;
232 sopt.sopt_val = &tv;
233 sopt.sopt_valsize = sizeof tv;
234
235 if ((error = sosetopt(so, &sopt)) != 0)
236 goto out;
237
238 /*
239 * Enable broadcast if necessary.
240 */
241 if (from_p) {
242 int on = 1;
243 sopt.sopt_name = SO_BROADCAST;
244 sopt.sopt_val = &on;
245 sopt.sopt_valsize = sizeof on;
246 if ((error = sosetopt(so, &sopt)) != 0)
247 goto out;
248 }
249
250 /*
251 * Bind the local endpoint to a reserved port,
252 * because some NFS servers refuse requests from
253 * non-reserved (non-privileged) ports.
254 */
255 sin = &ssin;
256 bzero(sin, sizeof *sin);
257 sin->sin_len = sizeof(*sin);
258 sin->sin_family = AF_INET;
259 sin->sin_addr.s_addr = INADDR_ANY;
260 tport = IPPORT_RESERVED;
261 do {
262 tport--;
263 sin->sin_port = htons(tport);
264 error = sobind(so, (struct sockaddr *)sin, td);
265 } while (error == EADDRINUSE &&
266 tport > IPPORT_RESERVED / 2);
267 if (error) {
268 printf("bind failed\n");
269 goto out;
270 }
271
272 /*
273 * Setup socket address for the server.
274 */
275
276 /*
277 * Prepend RPC message header.
278 */
279 mhead = m_gethdr(M_TRYWAIT, MT_DATA);
280 mhead->m_next = *data;
281 call = mtod(mhead, struct krpc_call *);
282 mhead->m_len = sizeof(*call);
283 bzero((caddr_t)call, sizeof(*call));
284 /* rpc_call part */
285 xid++;
286 call->rp_xid = txdr_unsigned(xid);
287 /* call->rp_direction = 0; */
288 call->rp_rpcvers = txdr_unsigned(2);
289 call->rp_prog = txdr_unsigned(prog);
290 call->rp_vers = txdr_unsigned(vers);
291 call->rp_proc = txdr_unsigned(func);
292 /* rpc_auth part (auth_unix as root) */
293 call->rpc_auth.authtype = txdr_unsigned(RPCAUTH_UNIX);
294 call->rpc_auth.authlen = txdr_unsigned(sizeof(struct auth_unix));
295 /* rpc_verf part (auth_null) */
296 call->rpc_verf.authtype = 0;
297 call->rpc_verf.authlen = 0;
298
299 /*
300 * Setup packet header
301 */
302 len = 0;
303 m = mhead;
304 while (m) {
305 len += m->m_len;
306 m = m->m_next;
307 }
308 mhead->m_pkthdr.len = len;
309 mhead->m_pkthdr.rcvif = NULL;
310
311 /*
312 * Send it, repeatedly, until a reply is received,
313 * but delay each re-send by an increasing amount.
314 * If the delay hits the maximum, start complaining.
315 */
316 timo = 0;
317 for (;;) {
318 /* Send RPC request (or re-send). */
319 m = m_copym(mhead, 0, M_COPYALL, M_TRYWAIT);
320 if (m == NULL) {
321 error = ENOBUFS;
322 goto out;
323 }
324 error = sosend(so, (struct sockaddr *)sa, NULL, m,
325 NULL, 0, td);
326 if (error) {
327 printf("krpc_call: sosend: %d\n", error);
328 goto out;
329 }
330 m = NULL;
331
332 /* Determine new timeout. */
333 if (timo < MAX_RESEND_DELAY)
334 timo++;
335 else {
336 saddr = ntohl(sa->sin_addr.s_addr);
337 printf("RPC timeout for server %d.%d.%d.%d\n",
338 (saddr >> 24) & 255,
339 (saddr >> 16) & 255,
340 (saddr >> 8) & 255,
341 saddr & 255);
342 }
343
344 /*
345 * Wait for up to timo seconds for a reply.
346 * The socket receive timeout was set to 1 second.
347 */
348 secs = timo;
349 while (secs > 0) {
350 if (from) {
351 FREE(from, M_SONAME);
352 from = NULL;
353 }
354 if (m) {
355 m_freem(m);
356 m = NULL;
357 }
358 bzero(&auio, sizeof(auio));
359 auio.uio_resid = len = 1<<16;
360 rcvflg = 0;
361 error = soreceive(so, &from, &auio, &m, NULL, &rcvflg);
362 if (error == EWOULDBLOCK) {
363 secs--;
364 continue;
365 }
366 if (error)
367 goto out;
368 len -= auio.uio_resid;
369
370 /* Does the reply contain at least a header? */
371 if (len < MIN_REPLY_HDR)
372 continue;
373 if (m->m_len < MIN_REPLY_HDR)
374 continue;
375 reply = mtod(m, struct krpc_reply *);
376
377 /* Is it the right reply? */
378 if (reply->rp_direction != txdr_unsigned(RPC_REPLY))
379 continue;
380
381 if (reply->rp_xid != txdr_unsigned(xid))
382 continue;
383
384 /* Was RPC accepted? (authorization OK) */
385 if (reply->rp_astatus != 0) {
386 error = fxdr_unsigned(u_int32_t, reply->rp_errno);
387 printf("rpc denied, error=%d\n", error);
388 continue;
389 }
390
391 /* Did the call succeed? */
392 if (reply->rp_status != 0) {
393 error = fxdr_unsigned(u_int32_t, reply->rp_status);
394 if (error == RPC_PROGMISMATCH) {
395 error = EBADRPC;
396 goto out;
397 }
398 printf("rpc denied, status=%d\n", error);
399 continue;
400 }
401
402 goto gotreply; /* break two levels */
403
404 } /* while secs */
405 } /* forever send/receive */
406
407 error = ETIMEDOUT;
408 goto out;
409
410 gotreply:
411
412 /*
413 * Get RPC reply header into first mbuf,
414 * get its length, then strip it off.
415 */
416 len = sizeof(*reply);
417 if (m->m_len < len) {
418 m = m_pullup(m, len);
419 if (m == NULL) {
420 error = ENOBUFS;
421 goto out;
422 }
423 }
424 reply = mtod(m, struct krpc_reply *);
425 if (reply->rp_auth.authtype != 0) {
426 len += fxdr_unsigned(u_int32_t, reply->rp_auth.authlen);
427 len = (len + 3) & ~3; /* XXX? */
428 }
429 m_adj(m, len);
430
431 /* result */
432 *data = m;
433 if (from_p) {
434 *from_p = from;
435 from = NULL;
436 }
437
438 out:
439 if (mhead) m_freem(mhead);
440 if (from) free(from, M_SONAME);
441 soclose(so);
442 return error;
443 }
444
445 /*
446 * eXternal Data Representation routines.
447 * (but with non-standard args...)
448 */
449
450 /*
451 * String representation for RPC.
452 */
453 struct xdr_string {
454 u_int32_t len; /* length without null or padding */
455 char data[4]; /* data (longer, of course) */
456 /* data is padded to a long-word boundary */
457 };
458
459 struct mbuf *
460 xdr_string_encode(char *str, int len)
461 {
462 struct mbuf *m;
463 struct xdr_string *xs;
464 int dlen; /* padded string length */
465 int mlen; /* message length */
466
467 dlen = (len + 3) & ~3;
468 mlen = dlen + 4;
469
470 if (mlen > MCLBYTES) /* If too big, we just can't do it. */
471 return (NULL);
472
473 m = m_get(M_TRYWAIT, MT_DATA);
474 if (mlen > MLEN) {
475 MCLGET(m, M_TRYWAIT);
476 if ((m->m_flags & M_EXT) == 0) {
477 (void) m_free(m); /* There can be only one. */
478 return (NULL);
479 }
480 }
481 xs = mtod(m, struct xdr_string *);
482 m->m_len = mlen;
483 xs->len = txdr_unsigned(len);
484 bcopy(str, xs->data, len);
485 return (m);
486 }
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