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1.1 nbrk 1: /* $OpenBSD: krpc_subr.c,v 1.14 2007/02/27 19:09:56 deraadt Exp $ */
2: /* $NetBSD: krpc_subr.c,v 1.12.4.1 1996/06/07 00:52:26 cgd Exp $ */
3:
4: /*
5: * Copyright (c) 1995 Gordon Ross, Adam Glass
6: * Copyright (c) 1992 Regents of the University of California.
7: * All rights reserved.
8: *
9: * This software was developed by the Computer Systems Engineering group
10: * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and
11: * contributed to Berkeley.
12: *
13: * Redistribution and use in source and binary forms, with or without
14: * modification, are permitted provided that the following conditions
15: * are met:
16: * 1. Redistributions of source code must retain the above copyright
17: * notice, this list of conditions and the following disclaimer.
18: * 2. Redistributions in binary form must reproduce the above copyright
19: * notice, this list of conditions and the following disclaimer in the
20: * documentation and/or other materials provided with the distribution.
21: * 3. All advertising materials mentioning features or use of this software
22: * must display the following acknowledgement:
23: * This product includes software developed by the University of
24: * California, Lawrence Berkeley Laboratory and its contributors.
25: * 4. Neither the name of the University nor the names of its contributors
26: * may be used to endorse or promote products derived from this software
27: * without specific prior written permission.
28: *
29: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
30: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
31: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
32: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
33: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
34: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
35: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
36: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
37: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
38: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
39: * SUCH DAMAGE.
40: *
41: * partially based on:
42: * libnetboot/rpc.c
43: * @(#) Header: rpc.c,v 1.12 93/09/28 08:31:56 leres Exp (LBL)
44: */
45:
46: #include <sys/param.h>
47: #include <sys/systm.h>
48: #include <sys/conf.h>
49: #include <sys/ioctl.h>
50: #include <sys/proc.h>
51: #include <sys/mount.h>
52: #include <sys/mbuf.h>
53: #include <sys/reboot.h>
54: #include <sys/socket.h>
55: #include <sys/socketvar.h>
56:
57: #include <net/if.h>
58: #include <netinet/in.h>
59:
60: #include <nfs/rpcv2.h>
61: #include <nfs/krpc.h>
62: #include <nfs/xdr_subs.h>
63: #include <dev/rndvar.h>
64:
65: /*
66: * Kernel support for Sun RPC
67: *
68: * Used currently for bootstrapping in nfs diskless configurations.
69: */
70:
71: /*
72: * Generic RPC headers
73: */
74:
75: struct auth_info {
76: u_int32_t authtype; /* auth type */
77: u_int32_t authlen; /* auth length */
78: };
79:
80: struct auth_unix {
81: int32_t ua_time;
82: int32_t ua_hostname; /* null */
83: int32_t ua_uid;
84: int32_t ua_gid;
85: int32_t ua_gidlist; /* null */
86: };
87:
88: struct rpc_call {
89: u_int32_t rp_xid; /* request transaction id */
90: int32_t rp_direction; /* call direction (0) */
91: u_int32_t rp_rpcvers; /* rpc version (2) */
92: u_int32_t rp_prog; /* program */
93: u_int32_t rp_vers; /* version */
94: u_int32_t rp_proc; /* procedure */
95: struct auth_info rpc_auth;
96: struct auth_unix rpc_unix;
97: struct auth_info rpc_verf;
98: };
99:
100: struct rpc_reply {
101: u_int32_t rp_xid; /* request transaction id */
102: int32_t rp_direction; /* call direction (1) */
103: int32_t rp_astatus; /* accept status (0: accepted) */
104: union {
105: u_int32_t rpu_errno;
106: struct {
107: struct auth_info rok_auth;
108: u_int32_t rok_status;
109: } rpu_rok;
110: } rp_u;
111: };
112: #define rp_errno rp_u.rpu_errno
113: #define rp_auth rp_u.rpu_rok.rok_auth
114: #define rp_status rp_u.rpu_rok.rok_status
115:
116: #define MIN_REPLY_HDR 16 /* xid, dir, astat, errno */
117:
118: /*
119: * What is the longest we will wait before re-sending a request?
120: * Note this is also the frequency of "RPC timeout" messages.
121: * The re-send loop count sup linearly to this maximum, so the
122: * first complaint will happen after (1+2+3+4+5)=15 seconds.
123: */
124: #define MAX_RESEND_DELAY 5 /* seconds */
125:
126: /*
127: * Call portmap to lookup a port number for a particular rpc program
128: * Returns non-zero error on failure.
129: */
130: int
131: krpc_portmap(sin, prog, vers, portp)
132: struct sockaddr_in *sin; /* server address */
133: u_int prog, vers; /* host order */
134: u_int16_t *portp; /* network order */
135: {
136: struct sdata {
137: u_int32_t prog; /* call program */
138: u_int32_t vers; /* call version */
139: u_int32_t proto; /* call protocol */
140: u_int32_t port; /* call port (unused) */
141: } *sdata;
142: struct rdata {
143: u_int16_t pad;
144: u_int16_t port;
145: } *rdata;
146: struct mbuf *m;
147: int error;
148:
149: /* The portmapper port is fixed. */
150: if (prog == PMAPPROG) {
151: *portp = htons(PMAPPORT);
152: return 0;
153: }
154:
155: m = m_get(M_WAIT, MT_DATA);
156: sdata = mtod(m, struct sdata *);
157: m->m_len = sizeof(*sdata);
158:
159: /* Do the RPC to get it. */
160: sdata->prog = txdr_unsigned(prog);
161: sdata->vers = txdr_unsigned(vers);
162: sdata->proto = txdr_unsigned(IPPROTO_UDP);
163: sdata->port = 0;
164:
165: sin->sin_port = htons(PMAPPORT);
166: error = krpc_call(sin, PMAPPROG, PMAPVERS,
167: PMAPPROC_GETPORT, &m, NULL, -1);
168: if (error)
169: return error;
170:
171: if (m->m_len < sizeof(*rdata)) {
172: m = m_pullup(m, sizeof(*rdata));
173: if (m == NULL)
174: return ENOBUFS;
175: }
176: rdata = mtod(m, struct rdata *);
177: *portp = rdata->port;
178:
179: m_freem(m);
180: return 0;
181: }
182:
183: /*
184: * Do a remote procedure call (RPC) and wait for its reply.
185: * If from_p is non-null, then we are doing broadcast, and
186: * the address from whence the response came is saved there.
187: */
188: int
189: krpc_call(sa, prog, vers, func, data, from_p, retries)
190: struct sockaddr_in *sa;
191: u_int prog, vers, func;
192: struct mbuf **data; /* input/output */
193: struct mbuf **from_p; /* output */
194: int retries;
195: {
196: struct socket *so;
197: struct sockaddr_in *sin;
198: struct mbuf *m, *nam, *mhead, *from, *mopt;
199: struct rpc_call *call;
200: struct rpc_reply *reply;
201: struct uio auio;
202: int error, rcvflg, timo, secs, len;
203: static u_int32_t xid = 0;
204: u_int32_t newxid;
205: int *ip;
206: struct timeval *tv;
207:
208: /*
209: * Validate address family.
210: * Sorry, this is INET specific...
211: */
212: if (sa->sin_family != AF_INET)
213: return (EAFNOSUPPORT);
214:
215: /* Free at end if not null. */
216: nam = mhead = NULL;
217: from = NULL;
218:
219: /*
220: * Create socket and set its receive timeout.
221: */
222: if ((error = socreate(AF_INET, &so, SOCK_DGRAM, 0)))
223: goto out;
224:
225: m = m_get(M_WAIT, MT_SOOPTS);
226: tv = mtod(m, struct timeval *);
227: m->m_len = sizeof(*tv);
228: tv->tv_sec = 1;
229: tv->tv_usec = 0;
230: if ((error = sosetopt(so, SOL_SOCKET, SO_RCVTIMEO, m)))
231: goto out;
232:
233: /*
234: * Enable broadcast if necessary.
235: */
236: if (from_p) {
237: int32_t *on;
238: m = m_get(M_WAIT, MT_SOOPTS);
239: on = mtod(m, int32_t *);
240: m->m_len = sizeof(*on);
241: *on = 1;
242: if ((error = sosetopt(so, SOL_SOCKET, SO_BROADCAST, m)))
243: goto out;
244: }
245:
246: /*
247: * Bind the local endpoint to a reserved port,
248: * because some NFS servers refuse requests from
249: * non-reserved (non-privileged) ports.
250: */
251: m = m_getclr(M_WAIT, MT_SONAME);
252: sin = mtod(m, struct sockaddr_in *);
253: sin->sin_len = m->m_len = sizeof(*sin);
254: sin->sin_family = AF_INET;
255: sin->sin_addr.s_addr = INADDR_ANY;
256:
257: MGET(mopt, M_WAIT, MT_SOOPTS);
258: mopt->m_len = sizeof(int);
259: ip = mtod(mopt, int *);
260: *ip = IP_PORTRANGE_LOW;
261: error = sosetopt(so, IPPROTO_IP, IP_PORTRANGE, mopt);
262: if (error)
263: goto out;
264:
265: MGET(m, M_WAIT, MT_SONAME);
266: sin = mtod(m, struct sockaddr_in *);
267: sin->sin_len = m->m_len = sizeof (struct sockaddr_in);
268: sin->sin_family = AF_INET;
269: sin->sin_addr.s_addr = INADDR_ANY;
270: sin->sin_port = htons(0);
271: error = sobind(so, m);
272: m_freem(m);
273: if (error) {
274: printf("bind failed\n");
275: goto out;
276: }
277:
278: MGET(mopt, M_WAIT, MT_SOOPTS);
279: mopt->m_len = sizeof(int);
280: ip = mtod(mopt, int *);
281: *ip = IP_PORTRANGE_DEFAULT;
282: error = sosetopt(so, IPPROTO_IP, IP_PORTRANGE, mopt);
283: if (error)
284: goto out;
285:
286: /*
287: * Setup socket address for the server.
288: */
289: nam = m_get(M_WAIT, MT_SONAME);
290: sin = mtod(nam, struct sockaddr_in *);
291: bcopy((caddr_t)sa, (caddr_t)sin, (nam->m_len = sa->sin_len));
292:
293: /*
294: * Prepend RPC message header.
295: */
296: mhead = m_gethdr(M_WAIT, MT_DATA);
297: mhead->m_next = *data;
298: call = mtod(mhead, struct rpc_call *);
299: mhead->m_len = sizeof(*call);
300: bzero((caddr_t)call, sizeof(*call));
301: /* rpc_call part */
302: while ((newxid = arc4random()) == xid);
303: xid = newxid;
304: call->rp_xid = txdr_unsigned(xid);
305: /* call->rp_direction = 0; */
306: call->rp_rpcvers = txdr_unsigned(2);
307: call->rp_prog = txdr_unsigned(prog);
308: call->rp_vers = txdr_unsigned(vers);
309: call->rp_proc = txdr_unsigned(func);
310: /* rpc_auth part (auth_unix as root) */
311: call->rpc_auth.authtype = txdr_unsigned(RPCAUTH_UNIX);
312: call->rpc_auth.authlen = txdr_unsigned(sizeof(struct auth_unix));
313: /* rpc_verf part (auth_null) */
314: call->rpc_verf.authtype = 0;
315: call->rpc_verf.authlen = 0;
316:
317: /*
318: * Setup packet header
319: */
320: len = 0;
321: m = mhead;
322: while (m) {
323: len += m->m_len;
324: m = m->m_next;
325: }
326: mhead->m_pkthdr.len = len;
327: mhead->m_pkthdr.rcvif = NULL;
328:
329: /*
330: * Send it, repeatedly, until a reply is received,
331: * but delay each re-send by an increasing amount.
332: * If the delay hits the maximum, start complaining.
333: */
334: for (timo = 0; retries; retries--) {
335: /* Send RPC request (or re-send). */
336: m = m_copym(mhead, 0, M_COPYALL, M_WAIT);
337: if (m == NULL) {
338: error = ENOBUFS;
339: goto out;
340: }
341: error = sosend(so, nam, NULL, m, NULL, 0);
342: if (error) {
343: printf("krpc_call: sosend: %d\n", error);
344: goto out;
345: }
346: m = NULL;
347:
348: /* Determine new timeout. */
349: if (timo < MAX_RESEND_DELAY)
350: timo++;
351: else
352: printf("RPC timeout for server %s (0x%x) prog %u\n",
353: inet_ntoa(sin->sin_addr),
354: ntohl(sin->sin_addr.s_addr), prog);
355:
356: /*
357: * Wait for up to timo seconds for a reply.
358: * The socket receive timeout was set to 1 second.
359: */
360: secs = timo;
361: while (secs > 0) {
362: if (from) {
363: m_freem(from);
364: from = NULL;
365: }
366: if (m) {
367: m_freem(m);
368: m = NULL;
369: }
370: auio.uio_resid = len = 1<<16;
371: auio.uio_procp = NULL;
372: rcvflg = 0;
373: error = soreceive(so, &from, &auio, &m, NULL, &rcvflg);
374: if (error == EWOULDBLOCK) {
375: secs--;
376: continue;
377: }
378: if (error)
379: goto out;
380: len -= auio.uio_resid;
381:
382: /* Does the reply contain at least a header? */
383: if (len < MIN_REPLY_HDR)
384: continue;
385: if (m->m_len < MIN_REPLY_HDR)
386: continue;
387: reply = mtod(m, struct rpc_reply *);
388:
389: /* Is it the right reply? */
390: if (reply->rp_direction != txdr_unsigned(RPC_REPLY))
391: continue;
392:
393: if (reply->rp_xid != txdr_unsigned(xid))
394: continue;
395:
396: /* Was RPC accepted? (authorization OK) */
397: if (reply->rp_astatus != 0) {
398: error = fxdr_unsigned(u_int32_t, reply->rp_errno);
399: printf("rpc denied, error=%d\n", error);
400: continue;
401: }
402:
403: /* Did the call succeed? */
404: if (reply->rp_status != 0) {
405: error = fxdr_unsigned(u_int32_t, reply->rp_status);
406: printf("rpc denied, status=%d\n", error);
407: continue;
408: }
409:
410: goto gotreply; /* break two levels */
411:
412: } /* while secs */
413: } /* forever send/receive */
414:
415: error = ETIMEDOUT;
416: goto out;
417:
418: gotreply:
419:
420: /*
421: * Get RPC reply header into first mbuf,
422: * get its length, then strip it off.
423: */
424: len = sizeof(*reply);
425: if (m->m_len < len) {
426: m = m_pullup(m, len);
427: if (m == NULL) {
428: error = ENOBUFS;
429: goto out;
430: }
431: }
432: reply = mtod(m, struct rpc_reply *);
433: if (reply->rp_auth.authtype != 0) {
434: len += fxdr_unsigned(u_int32_t, reply->rp_auth.authlen);
435: len = (len + 3) & ~3; /* XXX? */
436: }
437: m_adj(m, len);
438:
439: /* result */
440: *data = m;
441: if (from_p) {
442: *from_p = from;
443: from = NULL;
444: }
445:
446: out:
447: if (nam) m_freem(nam);
448: if (mhead) m_freem(mhead);
449: if (from) m_freem(from);
450: soclose(so);
451: return error;
452: }
453:
454: /*
455: * eXternal Data Representation routines.
456: * (but with non-standard args...)
457: */
458:
459: /*
460: * String representation for RPC.
461: */
462: struct xdr_string {
463: u_int32_t len; /* length without null or padding */
464: char data[4]; /* data (longer, of course) */
465: /* data is padded to a long-word boundary */
466: };
467:
468: struct mbuf *
469: xdr_string_encode(str, len)
470: char *str;
471: int len;
472: {
473: struct mbuf *m;
474: struct xdr_string *xs;
475: int dlen; /* padded string length */
476: int mlen; /* message length */
477:
478: dlen = (len + 3) & ~3;
479: mlen = dlen + 4;
480:
481: if (mlen > MCLBYTES) /* If too big, we just can't do it. */
482: return (NULL);
483:
484: m = m_get(M_WAIT, MT_DATA);
485: if (mlen > MLEN) {
486: MCLGET(m, M_WAIT);
487: if ((m->m_flags & M_EXT) == 0) {
488: (void) m_free(m); /* There can be only one. */
489: return (NULL);
490: }
491: }
492: xs = mtod(m, struct xdr_string *);
493: m->m_len = mlen;
494: xs->len = txdr_unsigned(len);
495: bcopy(str, xs->data, len);
496: return (m);
497: }
498:
499: struct mbuf *
500: xdr_string_decode(m, str, len_p)
501: struct mbuf *m;
502: char *str;
503: int *len_p; /* bufsize - 1 */
504: {
505: struct xdr_string *xs;
506: int mlen; /* message length */
507: int slen; /* string length */
508:
509: if (m->m_len < 4) {
510: m = m_pullup(m, 4);
511: if (m == NULL)
512: return (NULL);
513: }
514: xs = mtod(m, struct xdr_string *);
515: slen = fxdr_unsigned(u_int32_t, xs->len);
516: mlen = 4 + ((slen + 3) & ~3);
517:
518: if (slen > *len_p)
519: slen = *len_p;
520: if (slen > m->m_pkthdr.len) {
521: m_freem(m);
522: return (NULL);
523: }
524: m_copydata(m, 4, slen, str);
525: m_adj(m, mlen);
526:
527: str[slen] = '\0';
528: *len_p = slen;
529:
530: return (m);
531: }
532:
533:
534: /*
535: * Inet address in RPC messages
536: * (Note, really four ints, NOT chars. Blech.)
537: */
538: struct xdr_inaddr {
539: u_int32_t atype;
540: u_int32_t addr[4];
541: };
542:
543: struct mbuf *
544: xdr_inaddr_encode(ia)
545: struct in_addr *ia; /* already in network order */
546: {
547: struct mbuf *m;
548: struct xdr_inaddr *xi;
549: u_int8_t *cp;
550: u_int32_t *ip;
551:
552: m = m_get(M_WAIT, MT_DATA);
553: xi = mtod(m, struct xdr_inaddr *);
554: m->m_len = sizeof(*xi);
555: xi->atype = txdr_unsigned(1);
556: ip = xi->addr;
557: cp = (u_int8_t *)&ia->s_addr;
558: *ip++ = txdr_unsigned(*cp++);
559: *ip++ = txdr_unsigned(*cp++);
560: *ip++ = txdr_unsigned(*cp++);
561: *ip++ = txdr_unsigned(*cp++);
562:
563: return (m);
564: }
565:
566: struct mbuf *
567: xdr_inaddr_decode(m, ia)
568: struct mbuf *m;
569: struct in_addr *ia; /* already in network order */
570: {
571: struct xdr_inaddr *xi;
572: u_int8_t *cp;
573: u_int32_t *ip;
574:
575: if (m->m_len < sizeof(*xi)) {
576: m = m_pullup(m, sizeof(*xi));
577: if (m == NULL)
578: return (NULL);
579: }
580: xi = mtod(m, struct xdr_inaddr *);
581: if (xi->atype != txdr_unsigned(1)) {
582: ia->s_addr = INADDR_ANY;
583: goto out;
584: }
585: ip = xi->addr;
586: cp = (u_int8_t *)&ia->s_addr;
587: *cp++ = fxdr_unsigned(u_int8_t, *ip++);
588: *cp++ = fxdr_unsigned(u_int8_t, *ip++);
589: *cp++ = fxdr_unsigned(u_int8_t, *ip++);
590: *cp++ = fxdr_unsigned(u_int8_t, *ip++);
591:
592: out:
593: m_adj(m, sizeof(*xi));
594: return (m);
595: }