krpc_subr.c revision 1.25
1 /* $NetBSD: krpc_subr.c,v 1.25 2001/11/10 10:59:08 lukem 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 __KERNEL_RCSID(0, "$NetBSD: krpc_subr.c,v 1.25 2001/11/10 10:59:08 lukem Exp $"); 47 48 #include <sys/param.h> 49 #include <sys/systm.h> 50 #include <sys/conf.h> 51 #include <sys/ioctl.h> 52 #include <sys/proc.h> 53 #include <sys/mount.h> 54 #include <sys/mbuf.h> 55 #include <sys/reboot.h> 56 #include <sys/socket.h> 57 #include <sys/socketvar.h> 58 59 #include <net/if.h> 60 #include <netinet/in.h> 61 62 #include <nfs/rpcv2.h> 63 #include <nfs/krpc.h> 64 #include <nfs/xdr_subs.h> 65 #include <nfs/nfsproto.h> /* XXX NFSX_V3FHMAX for next */ 66 #include <nfs/nfs.h> 67 #include <nfs/nfsmount.h> 68 #include <nfs/nfsdiskless.h> /* XXX decl nfs_boot_sendrecv */ 69 70 /* 71 * Kernel support for Sun RPC 72 * 73 * Used currently for bootstrapping in nfs diskless configurations. 74 */ 75 76 /* 77 * Generic RPC headers 78 */ 79 80 struct auth_info { 81 u_int32_t authtype; /* auth type */ 82 u_int32_t authlen; /* auth length */ 83 }; 84 85 struct auth_unix { 86 int32_t ua_time; 87 int32_t ua_hostname; /* null */ 88 int32_t ua_uid; 89 int32_t ua_gid; 90 int32_t ua_gidlist; /* null */ 91 }; 92 93 struct rpc_call { 94 u_int32_t rp_xid; /* request transaction id */ 95 int32_t rp_direction; /* call direction (0) */ 96 u_int32_t rp_rpcvers; /* rpc version (2) */ 97 u_int32_t rp_prog; /* program */ 98 u_int32_t rp_vers; /* version */ 99 u_int32_t rp_proc; /* procedure */ 100 struct auth_info rpc_auth; 101 struct auth_unix rpc_unix; 102 struct auth_info rpc_verf; 103 }; 104 105 struct rpc_reply { 106 u_int32_t rp_xid; /* request transaction id */ 107 int32_t rp_direction; /* call direction (1) */ 108 int32_t rp_astatus; /* accept status (0: accepted) */ 109 union { 110 /* rejected */ 111 struct { 112 u_int32_t rej_stat; 113 u_int32_t rej_val1; 114 u_int32_t rej_val2; 115 } rpu_rej; 116 /* accepted */ 117 struct { 118 struct auth_info rok_auth; 119 u_int32_t rok_status; 120 } rpu_rok; 121 } rp_u; 122 }; 123 #define rp_rstat rp_u.rpu_rej.rej_stat 124 #define rp_auth rp_u.rpu_rok.rok_auth 125 #define rp_status rp_u.rpu_rok.rok_status 126 127 #define MIN_REPLY_HDR 16 /* xid, dir, astat, errno */ 128 129 static int krpccheck __P((struct mbuf*, void*)); 130 131 /* 132 * Call portmap to lookup a port number for a particular rpc program 133 * Returns non-zero error on failure. 134 */ 135 int 136 krpc_portmap(sin, prog, vers, proto, portp) 137 struct sockaddr_in *sin; /* server address */ 138 u_int prog, vers, proto; /* host order */ 139 u_int16_t *portp; /* network order */ 140 { 141 struct sdata { 142 u_int32_t prog; /* call program */ 143 u_int32_t vers; /* call version */ 144 u_int32_t proto; /* call protocol */ 145 u_int32_t port; /* call port (unused) */ 146 } *sdata; 147 struct rdata { 148 u_int16_t pad; 149 u_int16_t port; 150 } *rdata; 151 struct mbuf *m; 152 int error; 153 154 /* The portmapper port is fixed. */ 155 if (prog == PMAPPROG) { 156 *portp = htons(PMAPPORT); 157 return 0; 158 } 159 160 m = m_get(M_WAIT, MT_DATA); 161 sdata = mtod(m, struct sdata *); 162 m->m_len = sizeof(*sdata); 163 164 /* Do the RPC to get it. */ 165 sdata->prog = txdr_unsigned(prog); 166 sdata->vers = txdr_unsigned(vers); 167 sdata->proto = txdr_unsigned(proto); 168 sdata->port = 0; 169 170 sin->sin_port = htons(PMAPPORT); 171 error = krpc_call(sin, PMAPPROG, PMAPVERS, 172 PMAPPROC_GETPORT, &m, NULL); 173 if (error) 174 return error; 175 176 if (m->m_len < sizeof(*rdata)) { 177 m = m_pullup(m, sizeof(*rdata)); 178 if (m == NULL) 179 return ENOBUFS; 180 } 181 rdata = mtod(m, struct rdata *); 182 *portp = rdata->port; 183 184 m_freem(m); 185 return 0; 186 } 187 188 static int krpccheck(m, context) 189 struct mbuf *m; 190 void *context; 191 { 192 struct rpc_reply *reply; 193 194 /* Does the reply contain at least a header? */ 195 if (m->m_pkthdr.len < MIN_REPLY_HDR) 196 return(-1); 197 if (m->m_len < sizeof(struct rpc_reply)) { 198 m = m_pullup(m, sizeof(struct rpc_reply)); 199 if (m == NULL) 200 return(-1); 201 } 202 reply = mtod(m, struct rpc_reply *); 203 204 /* Is it the right reply? */ 205 if (reply->rp_direction != txdr_unsigned(RPC_REPLY)) 206 return(-1); 207 208 if (reply->rp_xid != txdr_unsigned(*(u_int32_t*)context)) 209 return(-1); 210 211 return(0); 212 } 213 214 /* 215 * Do a remote procedure call (RPC) and wait for its reply. 216 * If from_p is non-null, then we are doing broadcast, and 217 * the address from whence the response came is saved there. 218 */ 219 int 220 krpc_call(sa, prog, vers, func, data, from_p) 221 struct sockaddr_in *sa; 222 u_int prog, vers, func; 223 struct mbuf **data; /* input/output */ 224 struct mbuf **from_p; /* output */ 225 { 226 struct socket *so; 227 struct sockaddr_in *sin; 228 struct mbuf *m, *nam, *mhead, *from; 229 struct rpc_call *call; 230 struct rpc_reply *reply; 231 int error, len; 232 static u_int32_t xid = ~0xFF; 233 u_int16_t tport; 234 235 /* 236 * Validate address family. 237 * Sorry, this is INET specific... 238 */ 239 if (sa->sin_family != AF_INET) 240 return (EAFNOSUPPORT); 241 242 /* Free at end if not null. */ 243 nam = mhead = NULL; 244 from = NULL; 245 246 /* 247 * Create socket and set its receive timeout. 248 */ 249 if ((error = socreate(AF_INET, &so, SOCK_DGRAM, 0))) 250 goto out; 251 252 if ((error = nfs_boot_setrecvtimo(so))) 253 goto out; 254 255 /* 256 * Enable broadcast if necessary. 257 */ 258 if (from_p) { 259 if ((error = nfs_boot_enbroadcast(so))) 260 goto out; 261 } 262 263 /* 264 * Bind the local endpoint to a reserved port, 265 * because some NFS servers refuse requests from 266 * non-reserved (non-privileged) ports. 267 */ 268 tport = IPPORT_RESERVED; 269 do { 270 tport--; 271 error = nfs_boot_sobind_ipport(so, tport); 272 } while (error == EADDRINUSE && 273 tport > IPPORT_RESERVED / 2); 274 if (error) { 275 printf("bind failed\n"); 276 goto out; 277 } 278 279 /* 280 * Setup socket address for the server. 281 */ 282 nam = m_get(M_WAIT, MT_SONAME); 283 sin = mtod(nam, struct sockaddr_in *); 284 memcpy((caddr_t)sin, (caddr_t)sa, 285 (nam->m_len = sa->sin_len)); 286 287 /* 288 * Prepend RPC message header. 289 */ 290 mhead = m_gethdr(M_WAIT, MT_DATA); 291 mhead->m_next = *data; 292 call = mtod(mhead, struct rpc_call *); 293 mhead->m_len = sizeof(*call); 294 memset((caddr_t)call, 0, sizeof(*call)); 295 /* rpc_call part */ 296 xid++; 297 call->rp_xid = txdr_unsigned(xid); 298 /* call->rp_direction = 0; */ 299 call->rp_rpcvers = txdr_unsigned(2); 300 call->rp_prog = txdr_unsigned(prog); 301 call->rp_vers = txdr_unsigned(vers); 302 call->rp_proc = txdr_unsigned(func); 303 /* rpc_auth part (auth_unix as root) */ 304 call->rpc_auth.authtype = txdr_unsigned(RPCAUTH_UNIX); 305 call->rpc_auth.authlen = txdr_unsigned(sizeof(struct auth_unix)); 306 /* rpc_verf part (auth_null) */ 307 call->rpc_verf.authtype = 0; 308 call->rpc_verf.authlen = 0; 309 310 /* 311 * Setup packet header 312 */ 313 len = 0; 314 m = mhead; 315 while (m) { 316 len += m->m_len; 317 m = m->m_next; 318 } 319 mhead->m_pkthdr.len = len; 320 mhead->m_pkthdr.rcvif = NULL; 321 322 error = nfs_boot_sendrecv(so, nam, 0, mhead, krpccheck, &m, &from, &xid); 323 if (error) 324 goto out; 325 326 /* m_pullup() was done in krpccheck() */ 327 reply = mtod(m, struct rpc_reply *); 328 329 /* Was RPC accepted? (authorization OK) */ 330 if (reply->rp_astatus != 0) { 331 /* Note: This is NOT an error code! */ 332 error = fxdr_unsigned(u_int32_t, reply->rp_rstat); 333 switch (error) { 334 case RPC_MISMATCH: 335 /* .re_status = RPC_VERSMISMATCH; */ 336 error = ERPCMISMATCH; 337 break; 338 case RPC_AUTHERR: 339 /* .re_status = RPC_AUTHERROR; */ 340 error = EAUTH; 341 break; 342 default: 343 /* unexpected */ 344 error = EBADRPC; 345 break; 346 } 347 goto out; 348 } 349 350 /* Did the call succeed? */ 351 if (reply->rp_status != 0) { 352 /* Note: This is NOT an error code! */ 353 error = fxdr_unsigned(u_int32_t, reply->rp_status); 354 switch (error) { 355 case RPC_PROGUNAVAIL: 356 error = EPROGUNAVAIL; 357 break; 358 case RPC_PROGMISMATCH: 359 error = EPROGMISMATCH; 360 break; 361 case RPC_PROCUNAVAIL: 362 error = EPROCUNAVAIL; 363 break; 364 case RPC_GARBAGE: 365 default: 366 error = EBADRPC; 367 } 368 goto out; 369 } 370 371 /* 372 * OK, we have received a good reply! 373 * Get its length, then strip it off. 374 */ 375 len = sizeof(*reply); 376 if (reply->rp_auth.authtype != 0) { 377 len += fxdr_unsigned(u_int32_t, reply->rp_auth.authlen); 378 len = (len + 3) & ~3; /* XXX? */ 379 } 380 m_adj(m, len); 381 382 /* result */ 383 *data = m; 384 if (from_p) { 385 *from_p = from; 386 from = NULL; 387 } 388 389 out: 390 if (nam) m_freem(nam); 391 if (mhead) m_freem(mhead); 392 if (from) m_freem(from); 393 soclose(so); 394 return error; 395 } 396 397 /* 398 * eXternal Data Representation routines. 399 * (but with non-standard args...) 400 */ 401 402 /* 403 * String representation for RPC. 404 */ 405 struct xdr_string { 406 u_int32_t len; /* length without null or padding */ 407 char data[4]; /* data (longer, of course) */ 408 /* data is padded to a long-word boundary */ 409 }; 410 411 struct mbuf * 412 xdr_string_encode(str, len) 413 char *str; 414 int len; 415 { 416 struct mbuf *m; 417 struct xdr_string *xs; 418 int dlen; /* padded string length */ 419 int mlen; /* message length */ 420 421 dlen = (len + 3) & ~3; 422 mlen = dlen + 4; 423 424 if (mlen > MCLBYTES) /* If too big, we just can't do it. */ 425 return (NULL); 426 427 m = m_get(M_WAIT, MT_DATA); 428 if (mlen > MLEN) { 429 MCLGET(m, M_WAIT); 430 if ((m->m_flags & M_EXT) == 0) { 431 (void) m_free(m); /* There can be only one. */ 432 return (NULL); 433 } 434 } 435 xs = mtod(m, struct xdr_string *); 436 m->m_len = mlen; 437 xs->len = txdr_unsigned(len); 438 memcpy(xs->data, str, len); 439 return (m); 440 } 441 442 struct mbuf * 443 xdr_string_decode(m, str, len_p) 444 struct mbuf *m; 445 char *str; 446 int *len_p; /* bufsize - 1 */ 447 { 448 struct xdr_string *xs; 449 int mlen; /* message length */ 450 int slen; /* string length */ 451 452 if (m->m_len < 4) { 453 m = m_pullup(m, 4); 454 if (m == NULL) 455 return (NULL); 456 } 457 xs = mtod(m, struct xdr_string *); 458 slen = fxdr_unsigned(u_int32_t, xs->len); 459 mlen = 4 + ((slen + 3) & ~3); 460 461 if (slen > *len_p) 462 slen = *len_p; 463 m_copydata(m, 4, slen, str); 464 m_adj(m, mlen); 465 466 str[slen] = '\0'; 467 *len_p = slen; 468 469 return (m); 470 } 471 472 473 /* 474 * Inet address in RPC messages 475 * (Note, really four ints, NOT chars. Blech.) 476 */ 477 struct xdr_inaddr { 478 u_int32_t atype; 479 u_int32_t addr[4]; 480 }; 481 482 struct mbuf * 483 xdr_inaddr_encode(ia) 484 struct in_addr *ia; /* already in network order */ 485 { 486 struct mbuf *m; 487 struct xdr_inaddr *xi; 488 u_int8_t *cp; 489 u_int32_t *ip; 490 491 m = m_get(M_WAIT, MT_DATA); 492 xi = mtod(m, struct xdr_inaddr *); 493 m->m_len = sizeof(*xi); 494 xi->atype = txdr_unsigned(1); 495 ip = xi->addr; 496 cp = (u_int8_t *)&ia->s_addr; 497 *ip++ = txdr_unsigned(*cp++); 498 *ip++ = txdr_unsigned(*cp++); 499 *ip++ = txdr_unsigned(*cp++); 500 *ip++ = txdr_unsigned(*cp++); 501 502 return (m); 503 } 504 505 struct mbuf * 506 xdr_inaddr_decode(m, ia) 507 struct mbuf *m; 508 struct in_addr *ia; /* already in network order */ 509 { 510 struct xdr_inaddr *xi; 511 u_int8_t *cp; 512 u_int32_t *ip; 513 514 if (m->m_len < sizeof(*xi)) { 515 m = m_pullup(m, sizeof(*xi)); 516 if (m == NULL) 517 return (NULL); 518 } 519 xi = mtod(m, struct xdr_inaddr *); 520 if (xi->atype != txdr_unsigned(1)) { 521 ia->s_addr = INADDR_ANY; 522 goto out; 523 } 524 ip = xi->addr; 525 cp = (u_int8_t *)&ia->s_addr; 526 *cp++ = fxdr_unsigned(u_int8_t, *ip++); 527 *cp++ = fxdr_unsigned(u_int8_t, *ip++); 528 *cp++ = fxdr_unsigned(u_int8_t, *ip++); 529 *cp++ = fxdr_unsigned(u_int8_t, *ip++); 530 531 out: 532 m_adj(m, sizeof(*xi)); 533 return (m); 534 } 535
Indexes created Mon Sep 29 21:09:56 GMT 2025