Annotation of src/sys/nfs/krpc_subr.c, Revision 1.23
1.23 ! perry 1: /* $NetBSD: krpc_subr.c,v 1.22 1998/03/01 02:24:27 fvdl Exp $ */
1.3 cgd 2:
1.1 glass 3: /*
1.8 gwr 4: * Copyright (c) 1995 Gordon Ross, Adam Glass
1.1 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/param.h>
1.8 gwr 46: #include <sys/systm.h>
1.1 glass 47: #include <sys/conf.h>
48: #include <sys/ioctl.h>
49: #include <sys/proc.h>
50: #include <sys/mount.h>
51: #include <sys/mbuf.h>
1.8 gwr 52: #include <sys/reboot.h>
1.1 glass 53: #include <sys/socket.h>
1.8 gwr 54: #include <sys/socketvar.h>
1.1 glass 55:
56: #include <net/if.h>
57: #include <netinet/in.h>
58:
59: #include <nfs/rpcv2.h>
1.7 gwr 60: #include <nfs/krpc.h>
1.9 mycroft 61: #include <nfs/xdr_subs.h>
1.21 drochner 62: #include <nfs/nfsproto.h> /* XXX NFSX_V3FHMAX for next */
1.22 fvdl 63: #include <nfs/nfs.h>
64: #include <nfs/nfsmount.h>
1.21 drochner 65: #include <nfs/nfsdiskless.h> /* XXX decl nfs_boot_sendrecv */
1.1 glass 66:
67: /*
68: * Kernel support for Sun RPC
69: *
70: * Used currently for bootstrapping in nfs diskless configurations.
71: */
72:
73: /*
74: * Generic RPC headers
75: */
76:
77: struct auth_info {
1.10 gwr 78: u_int32_t authtype; /* auth type */
79: u_int32_t authlen; /* auth length */
80: };
81:
82: struct auth_unix {
83: int32_t ua_time;
84: int32_t ua_hostname; /* null */
85: int32_t ua_uid;
86: int32_t ua_gid;
87: int32_t ua_gidlist; /* null */
1.1 glass 88: };
89:
90: struct rpc_call {
1.8 gwr 91: u_int32_t rp_xid; /* request transaction id */
92: int32_t rp_direction; /* call direction (0) */
93: u_int32_t rp_rpcvers; /* rpc version (2) */
94: u_int32_t rp_prog; /* program */
95: u_int32_t rp_vers; /* version */
96: u_int32_t rp_proc; /* procedure */
1.10 gwr 97: struct auth_info rpc_auth;
98: struct auth_unix rpc_unix;
99: struct auth_info rpc_verf;
1.1 glass 100: };
101:
102: struct rpc_reply {
1.11 cgd 103: u_int32_t rp_xid; /* request transaction id */
1.12 fvdl 104: int32_t rp_direction; /* call direction (1) */
105: int32_t rp_astatus; /* accept status (0: accepted) */
1.1 glass 106: union {
1.20 gwr 107: /* rejected */
108: struct {
109: u_int32_t rej_stat;
110: u_int32_t rej_val1;
111: u_int32_t rej_val2;
112: } rpu_rej;
113: /* accepted */
1.1 glass 114: struct {
1.10 gwr 115: struct auth_info rok_auth;
116: u_int32_t rok_status;
117: } rpu_rok;
1.1 glass 118: } rp_u;
119: };
1.20 gwr 120: #define rp_rstat rp_u.rpu_rej.rej_stat
1.10 gwr 121: #define rp_auth rp_u.rpu_rok.rok_auth
122: #define rp_status rp_u.rpu_rok.rok_status
1.1 glass 123:
124: #define MIN_REPLY_HDR 16 /* xid, dir, astat, errno */
125:
1.21 drochner 126: static int krpccheck __P((struct mbuf*, void*));
1.2 gwr 127:
128: /*
1.1 glass 129: * Call portmap to lookup a port number for a particular rpc program
1.2 gwr 130: * Returns non-zero error on failure.
1.1 glass 131: */
132: int
1.19 fvdl 133: krpc_portmap(sin, prog, vers, proto, portp)
1.7 gwr 134: struct sockaddr_in *sin; /* server address */
1.19 fvdl 135: u_int prog, vers, proto; /* host order */
1.11 cgd 136: u_int16_t *portp; /* network order */
1.1 glass 137: {
138: struct sdata {
1.11 cgd 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) */
1.1 glass 143: } *sdata;
144: struct rdata {
1.8 gwr 145: u_int16_t pad;
146: u_int16_t port;
1.1 glass 147: } *rdata;
148: struct mbuf *m;
149: int error;
150:
151: /* The portmapper port is fixed. */
152: if (prog == PMAPPROG) {
153: *portp = htons(PMAPPORT);
154: return 0;
155: }
156:
1.8 gwr 157: m = m_get(M_WAIT, MT_DATA);
158: sdata = mtod(m, struct sdata *);
1.1 glass 159: m->m_len = sizeof(*sdata);
160:
161: /* Do the RPC to get it. */
1.9 mycroft 162: sdata->prog = txdr_unsigned(prog);
163: sdata->vers = txdr_unsigned(vers);
1.19 fvdl 164: sdata->proto = txdr_unsigned(proto);
1.1 glass 165: sdata->port = 0;
166:
1.7 gwr 167: sin->sin_port = htons(PMAPPORT);
168: error = krpc_call(sin, PMAPPROG, PMAPVERS,
169: PMAPPROC_GETPORT, &m, NULL);
1.1 glass 170: if (error)
171: return error;
172:
1.8 gwr 173: if (m->m_len < sizeof(*rdata)) {
174: m = m_pullup(m, sizeof(*rdata));
175: if (m == NULL)
176: return ENOBUFS;
177: }
1.1 glass 178: rdata = mtod(m, struct rdata *);
179: *portp = rdata->port;
180:
181: m_freem(m);
182: return 0;
183: }
184:
1.21 drochner 185: static int krpccheck(m, context)
186: struct mbuf *m;
187: void *context;
188: {
189: struct rpc_reply *reply;
190:
191: /* Does the reply contain at least a header? */
192: if (m->m_pkthdr.len < MIN_REPLY_HDR)
193: return(-1);
194: if (m->m_len < sizeof(struct rpc_reply)) {
195: m = m_pullup(m, sizeof(struct rpc_reply));
196: if (m == NULL)
197: return(-1);
198: }
199: reply = mtod(m, struct rpc_reply *);
200:
201: /* Is it the right reply? */
202: if (reply->rp_direction != txdr_unsigned(RPC_REPLY))
203: return(-1);
204:
205: if (reply->rp_xid != txdr_unsigned(*(u_int32_t*)context))
206: return(-1);
207:
208: return(0);
209: }
210:
1.1 glass 211: /*
212: * Do a remote procedure call (RPC) and wait for its reply.
1.7 gwr 213: * If from_p is non-null, then we are doing broadcast, and
214: * the address from whence the response came is saved there.
1.1 glass 215: */
216: int
1.7 gwr 217: krpc_call(sa, prog, vers, func, data, from_p)
218: struct sockaddr_in *sa;
1.8 gwr 219: u_int prog, vers, func;
1.1 glass 220: struct mbuf **data; /* input/output */
1.7 gwr 221: struct mbuf **from_p; /* output */
1.1 glass 222: {
223: struct socket *so;
224: struct sockaddr_in *sin;
1.7 gwr 225: struct mbuf *m, *nam, *mhead, *from;
1.1 glass 226: struct rpc_call *call;
227: struct rpc_reply *reply;
1.21 drochner 228: int error, len;
1.8 gwr 229: static u_int32_t xid = ~0xFF;
1.11 cgd 230: u_int16_t tport;
1.1 glass 231:
232: /*
233: * Validate address family.
234: * Sorry, this is INET specific...
235: */
1.7 gwr 236: if (sa->sin_family != AF_INET)
1.1 glass 237: return (EAFNOSUPPORT);
238:
239: /* Free at end if not null. */
240: nam = mhead = NULL;
1.7 gwr 241: from = NULL;
1.1 glass 242:
243: /*
244: * Create socket and set its recieve timeout.
245: */
246: if ((error = socreate(AF_INET, &so, SOCK_DGRAM, 0)))
247: goto out;
248:
1.21 drochner 249: if ((error = nfs_boot_setrecvtimo(so)))
1.1 glass 250: goto out;
1.7 gwr 251:
252: /*
253: * Enable broadcast if necessary.
254: */
255: if (from_p) {
1.21 drochner 256: if ((error = nfs_boot_enbroadcast(so)))
1.7 gwr 257: goto out;
1.1 glass 258: }
259:
260: /*
1.5 gwr 261: * Bind the local endpoint to a reserved port,
262: * because some NFS servers refuse requests from
263: * non-reserved (non-privileged) ports.
264: */
265: tport = IPPORT_RESERVED;
266: do {
267: tport--;
1.21 drochner 268: error = nfs_boot_sobind_ipport(so, tport);
1.5 gwr 269: } while (error == EADDRINUSE &&
270: tport > IPPORT_RESERVED / 2);
271: if (error) {
1.18 christos 272: printf("bind failed\n");
1.5 gwr 273: goto out;
274: }
275:
276: /*
1.1 glass 277: * Setup socket address for the server.
278: */
279: nam = m_get(M_WAIT, MT_SONAME);
280: sin = mtod(nam, struct sockaddr_in *);
1.23 ! perry 281: memcpy((caddr_t)sin, (caddr_t)sa,
1.8 gwr 282: (nam->m_len = sa->sin_len));
1.1 glass 283:
284: /*
1.2 gwr 285: * Prepend RPC message header.
1.1 glass 286: */
1.8 gwr 287: mhead = m_gethdr(M_WAIT, MT_DATA);
288: mhead->m_next = *data;
1.1 glass 289: call = mtod(mhead, struct rpc_call *);
1.8 gwr 290: mhead->m_len = sizeof(*call);
1.23 ! perry 291: memset((caddr_t)call, 0, sizeof(*call));
1.10 gwr 292: /* rpc_call part */
1.7 gwr 293: xid++;
1.9 mycroft 294: call->rp_xid = txdr_unsigned(xid);
1.1 glass 295: /* call->rp_direction = 0; */
1.9 mycroft 296: call->rp_rpcvers = txdr_unsigned(2);
297: call->rp_prog = txdr_unsigned(prog);
298: call->rp_vers = txdr_unsigned(vers);
299: call->rp_proc = txdr_unsigned(func);
1.10 gwr 300: /* rpc_auth part (auth_unix as root) */
301: call->rpc_auth.authtype = txdr_unsigned(RPCAUTH_UNIX);
302: call->rpc_auth.authlen = txdr_unsigned(sizeof(struct auth_unix));
303: /* rpc_verf part (auth_null) */
304: call->rpc_verf.authtype = 0;
305: call->rpc_verf.authlen = 0;
1.1 glass 306:
307: /*
1.8 gwr 308: * Setup packet header
309: */
310: len = 0;
311: m = mhead;
312: while (m) {
313: len += m->m_len;
314: m = m->m_next;
315: }
316: mhead->m_pkthdr.len = len;
317: mhead->m_pkthdr.rcvif = NULL;
318:
1.21 drochner 319: error = nfs_boot_sendrecv(so, nam, 0, mhead, krpccheck, &m, &from, &xid);
320: if (error)
1.20 gwr 321: goto out;
322:
1.21 drochner 323: /* m_pullup() was done in krpccheck() */
324: reply = mtod(m, struct rpc_reply *);
1.1 glass 325:
1.21 drochner 326: /* Was RPC accepted? (authorization OK) */
327: if (reply->rp_astatus != 0) {
328: /* Note: This is NOT an error code! */
329: error = fxdr_unsigned(u_int32_t, reply->rp_rstat);
330: switch (error) {
331: case RPC_MISMATCH:
332: /* .re_status = RPC_VERSMISMATCH; */
333: error = ERPCMISMATCH;
334: break;
335: case RPC_AUTHERR:
336: /* .re_status = RPC_AUTHERROR; */
337: error = EAUTH;
338: break;
339: default:
340: /* unexpected */
341: error = EBADRPC;
342: break;
1.20 gwr 343: }
1.21 drochner 344: goto out;
345: }
1.7 gwr 346:
1.21 drochner 347: /* Did the call succeed? */
348: if (reply->rp_status != 0) {
349: /* Note: This is NOT an error code! */
350: error = fxdr_unsigned(u_int32_t, reply->rp_status);
351: switch (error) {
352: case RPC_PROGUNAVAIL:
353: error = EPROGUNAVAIL;
354: break;
355: case RPC_PROGMISMATCH:
356: error = EPROGMISMATCH;
357: break;
358: case RPC_PROCUNAVAIL:
359: error = EPROCUNAVAIL;
360: break;
361: case RPC_GARBAGE:
362: default:
363: error = EBADRPC;
1.20 gwr 364: }
1.21 drochner 365: goto out;
366: }
1.1 glass 367:
368: /*
1.20 gwr 369: * OK, we have received a good reply!
1.21 drochner 370: * Get its length, then strip it off.
1.2 gwr 371: */
1.8 gwr 372: len = sizeof(*reply);
1.10 gwr 373: if (reply->rp_auth.authtype != 0) {
374: len += fxdr_unsigned(u_int32_t, reply->rp_auth.authlen);
1.1 glass 375: len = (len + 3) & ~3; /* XXX? */
376: }
377: m_adj(m, len);
1.2 gwr 378:
1.1 glass 379: /* result */
380: *data = m;
1.7 gwr 381: if (from_p) {
382: *from_p = from;
383: from = NULL;
384: }
1.1 glass 385:
386: out:
387: if (nam) m_freem(nam);
388: if (mhead) m_freem(mhead);
1.7 gwr 389: if (from) m_freem(from);
1.1 glass 390: soclose(so);
391: return error;
1.8 gwr 392: }
393:
394: /*
395: * eXternal Data Representation routines.
396: * (but with non-standard args...)
397: */
398:
399: /*
400: * String representation for RPC.
401: */
402: struct xdr_string {
403: u_int32_t len; /* length without null or padding */
404: char data[4]; /* data (longer, of course) */
405: /* data is padded to a long-word boundary */
406: };
407:
408: struct mbuf *
409: xdr_string_encode(str, len)
410: char *str;
411: int len;
412: {
413: struct mbuf *m;
414: struct xdr_string *xs;
415: int dlen; /* padded string length */
416: int mlen; /* message length */
417:
418: dlen = (len + 3) & ~3;
419: mlen = dlen + 4;
420:
1.13 cgd 421: if (mlen > MCLBYTES) /* If too big, we just can't do it. */
422: return (NULL);
423:
1.8 gwr 424: m = m_get(M_WAIT, MT_DATA);
425: if (mlen > MLEN) {
426: MCLGET(m, M_WAIT);
1.13 cgd 427: if ((m->m_flags & M_EXT) == 0) {
428: (void) m_free(m); /* There can be only one. */
429: return (NULL);
430: }
1.8 gwr 431: }
432: xs = mtod(m, struct xdr_string *);
433: m->m_len = mlen;
1.9 mycroft 434: xs->len = txdr_unsigned(len);
1.23 ! perry 435: memcpy(xs->data, str, len);
1.8 gwr 436: return (m);
437: }
438:
439: struct mbuf *
440: xdr_string_decode(m, str, len_p)
441: struct mbuf *m;
442: char *str;
443: int *len_p; /* bufsize - 1 */
444: {
445: struct xdr_string *xs;
446: int mlen; /* message length */
447: int slen; /* string length */
448:
449: if (m->m_len < 4) {
450: m = m_pullup(m, 4);
451: if (m == NULL)
452: return (NULL);
453: }
454: xs = mtod(m, struct xdr_string *);
1.9 mycroft 455: slen = fxdr_unsigned(u_int32_t, xs->len);
1.8 gwr 456: mlen = 4 + ((slen + 3) & ~3);
457:
458: if (slen > *len_p)
459: slen = *len_p;
460: m_copydata(m, 4, slen, str);
461: m_adj(m, mlen);
462:
463: str[slen] = '\0';
464: *len_p = slen;
465:
466: return (m);
467: }
468:
469:
470: /*
471: * Inet address in RPC messages
472: * (Note, really four ints, NOT chars. Blech.)
473: */
474: struct xdr_inaddr {
1.9 mycroft 475: u_int32_t atype;
476: u_int32_t addr[4];
1.8 gwr 477: };
478:
479: struct mbuf *
480: xdr_inaddr_encode(ia)
481: struct in_addr *ia; /* already in network order */
482: {
483: struct mbuf *m;
484: struct xdr_inaddr *xi;
1.9 mycroft 485: u_int8_t *cp;
486: u_int32_t *ip;
1.8 gwr 487:
488: m = m_get(M_WAIT, MT_DATA);
489: xi = mtod(m, struct xdr_inaddr *);
490: m->m_len = sizeof(*xi);
1.9 mycroft 491: xi->atype = txdr_unsigned(1);
1.8 gwr 492: ip = xi->addr;
1.9 mycroft 493: cp = (u_int8_t *)&ia->s_addr;
494: *ip++ = txdr_unsigned(*cp++);
495: *ip++ = txdr_unsigned(*cp++);
496: *ip++ = txdr_unsigned(*cp++);
497: *ip++ = txdr_unsigned(*cp++);
1.8 gwr 498:
499: return (m);
500: }
501:
502: struct mbuf *
503: xdr_inaddr_decode(m, ia)
504: struct mbuf *m;
505: struct in_addr *ia; /* already in network order */
506: {
507: struct xdr_inaddr *xi;
1.9 mycroft 508: u_int8_t *cp;
509: u_int32_t *ip;
1.8 gwr 510:
511: if (m->m_len < sizeof(*xi)) {
512: m = m_pullup(m, sizeof(*xi));
513: if (m == NULL)
514: return (NULL);
515: }
516: xi = mtod(m, struct xdr_inaddr *);
1.9 mycroft 517: if (xi->atype != txdr_unsigned(1)) {
1.8 gwr 518: ia->s_addr = INADDR_ANY;
519: goto out;
520: }
521: ip = xi->addr;
1.9 mycroft 522: cp = (u_int8_t *)&ia->s_addr;
523: *cp++ = fxdr_unsigned(u_int8_t, *ip++);
524: *cp++ = fxdr_unsigned(u_int8_t, *ip++);
525: *cp++ = fxdr_unsigned(u_int8_t, *ip++);
526: *cp++ = fxdr_unsigned(u_int8_t, *ip++);
1.8 gwr 527:
528: out:
529: m_adj(m, sizeof(*xi));
530: return (m);
1.1 glass 531: }
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