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1.1 root 1: /*
2: * Copyright (c) 1999 Apple Computer, Inc. All rights reserved.
3: *
4: * @APPLE_LICENSE_HEADER_START@
5: *
6: * Portions Copyright (c) 1999 Apple Computer, Inc. All Rights
7: * Reserved. This file contains Original Code and/or Modifications of
8: * Original Code as defined in and that are subject to the Apple Public
9: * Source License Version 1.1 (the "License"). You may not use this file
10: * except in compliance with the License. Please obtain a copy of the
11: * License at http://www.apple.com/publicsource and read it before using
12: * this file.
13: *
14: * The Original Code and all software distributed under the License are
15: * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
16: * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
17: * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
18: * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT. Please see the
19: * License for the specific language governing rights and limitations
20: * under the License.
21: *
22: * @APPLE_LICENSE_HEADER_END@
23: */
24:
25: /* Copyright (c) 1995 NeXT Computer, Inc. All Rights Reserved */
26: /*
27: * Copyright (c) 1994 Gordon Ross, Adam Glass
28: * Copyright (c) 1992 Regents of the University of California.
29: * All rights reserved.
30: *
31: * The NEXTSTEP Software License Agreement specifies the terms
32: * and conditions for redistribution.
33: *
34: * This software was developed by the Computer Systems Engineering group
35: * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and
36: * contributed to Berkeley.
37: *
38: * Redistribution and use in source and binary forms, with or without
39: * modification, are permitted provided that the following conditions
40: * are met:
41: * 1. Redistributions of source code must retain the above copyright
42: * notice, this list of conditions and the following disclaimer.
43: * 2. Redistributions in binary form must reproduce the above copyright
44: * notice, this list of conditions and the following disclaimer in the
45: * documentation and/or other materials provided with the distribution.
46: * 3. All advertising materials mentioning features or use of this software
47: * must display the following acknowledgement:
48: * This product includes software developed by the University of
49: * California, Lawrence Berkeley Laboratory and its contributors.
50: * 4. Neither the name of the University nor the names of its contributors
51: * may be used to endorse or promote products derived from this software
52: * without specific prior written permission.
53: *
54: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
55: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
56: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
57: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
58: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
59: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
60: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
61: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
62: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
63: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
64: * SUCH DAMAGE.
65: *
66: */
67:
68: #include <sys/param.h>
69: #include <sys/conf.h>
70: #include <sys/ioctl.h>
71: #include <sys/proc.h>
72: #include <sys/mount.h>
73: #include <sys/mbuf.h>
74: #include <sys/socket.h>
75: #include <sys/systm.h>
76: #include <sys/reboot.h>
77:
78: #include <net/if.h>
79: #include <netinet/in.h>
80:
81: #include <nfs/rpcv2.h>
82: #include <nfs/krpc.h>
83:
84: /*
85: * Kernel support for Sun RPC
86: *
87: * Used currently for bootstrapping in nfs diskless configurations.
88: *
89: * Note: will not work on variable-sized rpc args/results.
90: * implicit size-limit of an mbuf.
91: */
92:
93: /*
94: * Generic RPC headers
95: */
96:
97: struct auth_info {
98: u_int32_t rp_atype; /* auth type */
99: u_int32_t rp_alen; /* auth length */
100: };
101:
102: struct rpc_call {
103: u_int32_t rp_xid; /* request transaction id */
104: int32_t rp_direction; /* call direction (0) */
105: u_int32_t rp_rpcvers; /* rpc version (2) */
106: u_int32_t rp_prog; /* program */
107: u_int32_t rp_vers; /* version */
108: u_int32_t rp_proc; /* procedure */
109: struct auth_info rp_auth;
110: struct auth_info rp_verf;
111: };
112:
113: struct rpc_reply {
114: u_int32_t rp_xid; /* request transaction id */
115: int32_t rp_direction; /* call direction (1) */
116: int32_t rp_astatus; /* accept status (0: accepted) */
117: union {
118: u_int32_t rpu_errno;
119: struct {
120: struct auth_info rp_auth;
121: u_int32_t rp_rstatus;
122: } rpu_ok;
123: } rp_u;
124: };
125:
126: #define MIN_REPLY_HDR 16 /* xid, dir, astat, errno */
127:
128: /*
129: * What is the longest we will wait before re-sending a request?
130: * Note this is also the frequency of "RPC timeout" messages.
131: * The re-send loop count sup linearly to this maximum, so the
132: * first complaint will happen after (1+2+3+4+5)=15 seconds.
133: */
134: #define MAX_RESEND_DELAY 5 /* seconds */
135:
136: /*
137: * Call portmap to lookup a port number for a particular rpc program
138: * Returns non-zero error on failure.
139: */
140: int
141: krpc_portmap(sin, prog, vers, portp)
142: struct sockaddr_in *sin; /* server address */
143: u_int prog, vers; /* host order */
144: u_int16_t *portp; /* network order */
145: {
146: struct sdata {
147: u_int32_t prog; /* call program */
148: u_int32_t vers; /* call version */
149: u_int32_t proto; /* call protocol */
150: u_int32_t port; /* call port (unused) */
151: } *sdata;
152: struct rdata {
153: u_int16_t pad;
154: u_int16_t port;
155: } *rdata;
156: struct mbuf *m;
157: int error;
158:
159: /* The portmapper port is fixed. */
160: if (prog == PMAPPROG) {
161: *portp = htons(PMAPPORT);
162: return 0;
163: }
164:
165: m = m_gethdr(M_WAIT, MT_DATA);
166: if (m == NULL)
167: return ENOBUFS;
168: m->m_len = sizeof(*sdata);
169: m->m_pkthdr.len = m->m_len;
170: sdata = mtod(m, struct sdata *);
171:
172: /* Do the RPC to get it. */
173: sdata->prog = htonl(prog);
174: sdata->vers = htonl(vers);
175: sdata->proto = htonl(IPPROTO_UDP);
176: sdata->port = 0;
177:
178: sin->sin_port = htons(PMAPPORT);
179: error = krpc_call(sin, PMAPPROG, PMAPVERS,
180: PMAPPROC_GETPORT, &m, NULL);
181: if (error)
182: return error;
183:
184: rdata = mtod(m, struct rdata *);
185: *portp = rdata->port;
186:
187: m_freem(m);
188: return 0;
189: }
190:
191: /*
192: * Do a remote procedure call (RPC) and wait for its reply.
193: * If from_p is non-null, then we are doing broadcast, and
194: * the address from whence the response came is saved there.
195: */
196: int
197: krpc_call(sa, prog, vers, func, data, from_p)
198: struct sockaddr_in *sa;
199: u_int prog, vers, func;
200: struct mbuf **data; /* input/output */
201: struct mbuf **from_p; /* output */
202: {
203: struct socket *so;
204: struct sockaddr_in *sin;
205: struct mbuf *m, *nam, *mhead, *from;
206: struct rpc_call *call;
207: struct rpc_reply *reply;
208: struct uio auio;
209: int error, rcvflg, timo, secs, len;
210: static u_int32_t xid = ~0xFF;
211: u_int16_t tport;
212:
213: /*
214: * Validate address family.
215: * Sorry, this is INET specific...
216: */
217: if (sa->sin_family != AF_INET)
218: return (EAFNOSUPPORT);
219:
220: /* Free at end if not null. */
221: nam = mhead = NULL;
222: from = NULL;
223:
224: /*
225: * Create socket and set its recieve timeout.
226: */
227: if ((error = socreate(AF_INET, &so, SOCK_DGRAM, 0)))
228: goto out;
229:
230: m = m_get(M_WAIT, MT_SOOPTS);
231: if (m == NULL) {
232: error = ENOBUFS;
233: goto out;
234: } else {
235: struct timeval *tv;
236: tv = mtod(m, struct timeval *);
237: m->m_len = sizeof(*tv);
238: tv->tv_sec = 1;
239: tv->tv_usec = 0;
240: if ((error = sosetopt(so, SOL_SOCKET, SO_RCVTIMEO, m)))
241: goto out;
242: }
243:
244: /*
245: * Enable broadcast if necessary.
246: */
247: if (from_p) {
248: int32_t *on;
249: m = m_get(M_WAIT, MT_SOOPTS);
250: if (m == NULL) {
251: error = ENOBUFS;
252: goto out;
253: }
254: on = mtod(m, int32_t *);
255: m->m_len = sizeof(*on);
256: *on = 1;
257: if ((error = sosetopt(so, SOL_SOCKET, SO_BROADCAST, m)))
258: goto out;
259: }
260:
261: /*
262: * Bind the local endpoint to a reserved port,
263: * because some NFS servers refuse requests from
264: * non-reserved (non-privileged) ports.
265: */
266: m = m_getclr(M_WAIT, MT_SONAME);
267: sin = mtod(m, struct sockaddr_in *);
268: sin->sin_len = m->m_len = sizeof(*sin);
269: sin->sin_family = AF_INET;
270: sin->sin_addr.s_addr = INADDR_ANY;
271: tport = IPPORT_RESERVED;
272: do {
273: tport--;
274: sin->sin_port = htons(tport);
275: error = sobind(so, m);
276: } while (error == EADDRINUSE &&
277: tport > IPPORT_RESERVED / 2);
278: m_freem(m);
279: if (error) {
280: printf("bind failed\n");
281: goto out;
282: }
283:
284: /*
285: * Setup socket address for the server.
286: */
287: nam = m_get(M_WAIT, MT_SONAME);
288: if (nam == NULL) {
289: error = ENOBUFS;
290: goto out;
291: }
292: sin = mtod(nam, struct sockaddr_in *);
293: bcopy((caddr_t)sa, (caddr_t)sin, (nam->m_len = sa->sin_len));
294:
295: /*
296: * Prepend RPC message header.
297: */
298: m = *data;
299: *data = NULL;
300: #if DIAGNOSTIC
301: if ((m->m_flags & M_PKTHDR) == 0)
302: panic("krpc_call: send data w/o pkthdr");
303: if (m->m_pkthdr.len < m->m_len)
304: panic("krpc_call: pkthdr.len not set");
305: #endif
306: mhead = m_prepend(m, sizeof(*call), M_WAIT);
307: if (mhead == NULL) {
308: error = ENOBUFS;
309: goto out;
310: }
311: mhead->m_pkthdr.len += sizeof(*call);
312: mhead->m_pkthdr.rcvif = NULL;
313:
314: /*
315: * Fill in the RPC header
316: */
317: call = mtod(mhead, struct rpc_call *);
318: bzero((caddr_t)call, sizeof(*call));
319: xid++;
320: call->rp_xid = htonl(xid);
321: /* call->rp_direction = 0; */
322: call->rp_rpcvers = htonl(2);
323: call->rp_prog = htonl(prog);
324: call->rp_vers = htonl(vers);
325: call->rp_proc = htonl(func);
326: /* call->rp_auth = 0; */
327: /* call->rp_verf = 0; */
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: timo = 0;
335: for (;;) {
336: /* Send RPC request (or re-send). */
337: m = m_copym(mhead, 0, M_COPYALL, M_WAIT);
338: if (m == NULL) {
339: error = ENOBUFS;
340: goto out;
341: }
342: error = sosend(so, nam, NULL, m, NULL, 0);
343: if (error) {
344: printf("krpc_call: sosend: %d\n", error);
345: goto out;
346: }
347: m = NULL;
348:
349: /* Determine new timeout. */
350: if (timo < MAX_RESEND_DELAY)
351: timo++;
352: else
353: printf("RPC timeout for server 0x%x\n",
354: ntohl(sin->sin_addr.s_addr));
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: rcvflg = 0;
372: error = soreceive(so, &from, &auio, &m, NULL, &rcvflg);
373: if (error == EWOULDBLOCK) {
374: secs--;
375: continue;
376: }
377: if (error)
378: goto out;
379: len -= auio.uio_resid;
380:
381: /* Does the reply contain at least a header? */
382: if (len < MIN_REPLY_HDR)
383: continue;
384: if (m->m_len < MIN_REPLY_HDR)
385: continue;
386: reply = mtod(m, struct rpc_reply *);
387:
388: /* Is it the right reply? */
389: if (reply->rp_direction != htonl(RPC_REPLY))
390: continue;
391:
392: if (reply->rp_xid != htonl(xid))
393: continue;
394:
395: /* Was RPC accepted? (authorization OK) */
396: if (reply->rp_astatus != 0) {
397: error = ntohl(reply->rp_u.rpu_errno);
398: printf("rpc denied, error=%d\n", error);
399: continue;
400: }
401:
402: /* Did the call succeed? */
403: if ((error = ntohl(reply->rp_u.rpu_ok.rp_rstatus)) != 0) {
404: printf("rpc status=%d\n", error);
405: continue;
406: }
407:
408: goto gotreply; /* break two levels */
409:
410: } /* while secs */
411: } /* forever send/receive */
412:
413: error = ETIMEDOUT;
414: goto out;
415:
416: gotreply:
417:
418: /*
419: * Pull as much as we can into first mbuf, to make
420: * result buffer contiguous. Note that if the entire
421: * result won't fit into one mbuf, you're out of luck.
422: * XXX - Should not rely on making the entire reply
423: * contiguous (fix callers instead). -gwr
424: */
425: #if DIAGNOSTIC
426: if ((m->m_flags & M_PKTHDR) == 0)
427: panic("krpc_call: received pkt w/o header?");
428: #endif
429: len = m->m_pkthdr.len;
430: if (m->m_len < len) {
431: m = m_pullup(m, len);
432: if (m == NULL) {
433: error = ENOBUFS;
434: goto out;
435: }
436: reply = mtod(m, struct rpc_reply *);
437: }
438:
439: /*
440: * Strip RPC header
441: */
442: len = sizeof(*reply);
443: if (reply->rp_u.rpu_ok.rp_auth.rp_atype != 0) {
444: len += ntohl(reply->rp_u.rpu_ok.rp_auth.rp_alen);
445: len = (len + 3) & ~3; /* XXX? */
446: }
447: m_adj(m, len);
448:
449: /* result */
450: *data = m;
451: if (from_p) {
452: *from_p = from;
453: from = NULL;
454: }
455:
456: out:
457: if (nam) m_freem(nam);
458: if (mhead) m_freem(mhead);
459: if (from) m_freem(from);
460: soclose(so);
461: return error;
462: }
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