krpc_subr.c revision 1.21
1 /* $NetBSD: krpc_subr.c,v 1.21 1997/09/30 20:46:17 drochner 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/param.h> 46 #include <sys/systm.h> 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> 52 #include <sys/reboot.h> 53 #include <sys/socket.h> 54 #include <sys/socketvar.h> 55 56 #include <net/if.h> 57 #include <netinet/in.h> 58 59 #include <nfs/rpcv2.h> 60 #include <nfs/krpc.h> 61 #include <nfs/xdr_subs.h> 62 #include <nfs/nfsproto.h> /* XXX NFSX_V3FHMAX for next */ 63 #include <nfs/nfsdiskless.h> /* XXX decl nfs_boot_sendrecv */ 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 /* rejected */ 106 struct { 107 u_int32_t rej_stat; 108 u_int32_t rej_val1; 109 u_int32_t rej_val2; 110 } rpu_rej; 111 /* accepted */ 112 struct { 113 struct auth_info rok_auth; 114 u_int32_t rok_status; 115 } rpu_rok; 116 } rp_u; 117 }; 118 #define rp_rstat rp_u.rpu_rej.rej_stat 119 #define rp_auth rp_u.rpu_rok.rok_auth 120 #define rp_status rp_u.rpu_rok.rok_status 121 122 #define MIN_REPLY_HDR 16 /* xid, dir, astat, errno */ 123 124 static int krpccheck __P((struct mbuf*, void*)); 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, proto, portp) 132 struct sockaddr_in *sin; /* server address */ 133 u_int prog, vers, proto; /* 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(proto); 163 sdata->port = 0; 164 165 sin->sin_port = htons(PMAPPORT); 166 error = krpc_call(sin, PMAPPROG, PMAPVERS, 167 PMAPPROC_GETPORT, &m, NULL); 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 static int krpccheck(m, context) 184 struct mbuf *m; 185 void *context; 186 { 187 struct rpc_reply *reply; 188 189 /* Does the reply contain at least a header? */ 190 if (m->m_pkthdr.len < MIN_REPLY_HDR) 191 return(-1); 192 if (m->m_len < sizeof(struct rpc_reply)) { 193 m = m_pullup(m, sizeof(struct rpc_reply)); 194 if (m == NULL) 195 return(-1); 196 } 197 reply = mtod(m, struct rpc_reply *); 198 199 /* Is it the right reply? */ 200 if (reply->rp_direction != txdr_unsigned(RPC_REPLY)) 201 return(-1); 202 203 if (reply->rp_xid != txdr_unsigned(*(u_int32_t*)context)) 204 return(-1); 205 206 return(0); 207 } 208 209 /* 210 * Do a remote procedure call (RPC) and wait for its reply. 211 * If from_p is non-null, then we are doing broadcast, and 212 * the address from whence the response came is saved there. 213 */ 214 int 215 krpc_call(sa, prog, vers, func, data, from_p) 216 struct sockaddr_in *sa; 217 u_int prog, vers, func; 218 struct mbuf **data; /* input/output */ 219 struct mbuf **from_p; /* output */ 220 { 221 struct socket *so; 222 struct sockaddr_in *sin; 223 struct mbuf *m, *nam, *mhead, *from; 224 struct rpc_call *call; 225 struct rpc_reply *reply; 226 int error, len; 227 static u_int32_t xid = ~0xFF; 228 u_int16_t tport; 229 230 /* 231 * Validate address family. 232 * Sorry, this is INET specific... 233 */ 234 if (sa->sin_family != AF_INET) 235 return (EAFNOSUPPORT); 236 237 /* Free at end if not null. */ 238 nam = mhead = NULL; 239 from = NULL; 240 241 /* 242 * Create socket and set its recieve timeout. 243 */ 244 if ((error = socreate(AF_INET, &so, SOCK_DGRAM, 0))) 245 goto out; 246 247 if ((error = nfs_boot_setrecvtimo(so))) 248 goto out; 249 250 /* 251 * Enable broadcast if necessary. 252 */ 253 if (from_p) { 254 if ((error = nfs_boot_enbroadcast(so))) 255 goto out; 256 } 257 258 /* 259 * Bind the local endpoint to a reserved port, 260 * because some NFS servers refuse requests from 261 * non-reserved (non-privileged) ports. 262 */ 263 tport = IPPORT_RESERVED; 264 do { 265 tport--; 266 error = nfs_boot_sobind_ipport(so, tport); 267 } while (error == EADDRINUSE && 268 tport > IPPORT_RESERVED / 2); 269 if (error) { 270 printf("bind failed\n"); 271 goto out; 272 } 273 274 /* 275 * Setup socket address for the server. 276 */ 277 nam = m_get(M_WAIT, MT_SONAME); 278 sin = mtod(nam, struct sockaddr_in *); 279 bcopy((caddr_t)sa, (caddr_t)sin, 280 (nam->m_len = sa->sin_len)); 281 282 /* 283 * Prepend RPC message header. 284 */ 285 mhead = m_gethdr(M_WAIT, MT_DATA); 286 mhead->m_next = *data; 287 call = mtod(mhead, struct rpc_call *); 288 mhead->m_len = sizeof(*call); 289 bzero((caddr_t)call, sizeof(*call)); 290 /* rpc_call part */ 291 xid++; 292 call->rp_xid = txdr_unsigned(xid); 293 /* call->rp_direction = 0; */ 294 call->rp_rpcvers = txdr_unsigned(2); 295 call->rp_prog = txdr_unsigned(prog); 296 call->rp_vers = txdr_unsigned(vers); 297 call->rp_proc = txdr_unsigned(func); 298 /* rpc_auth part (auth_unix as root) */ 299 call->rpc_auth.authtype = txdr_unsigned(RPCAUTH_UNIX); 300 call->rpc_auth.authlen = txdr_unsigned(sizeof(struct auth_unix)); 301 /* rpc_verf part (auth_null) */ 302 call->rpc_verf.authtype = 0; 303 call->rpc_verf.authlen = 0; 304 305 /* 306 * Setup packet header 307 */ 308 len = 0; 309 m = mhead; 310 while (m) { 311 len += m->m_len; 312 m = m->m_next; 313 } 314 mhead->m_pkthdr.len = len; 315 mhead->m_pkthdr.rcvif = NULL; 316 317 error = nfs_boot_sendrecv(so, nam, 0, mhead, krpccheck, &m, &from, &xid); 318 if (error) 319 goto out; 320 321 /* m_pullup() was done in krpccheck() */ 322 reply = mtod(m, struct rpc_reply *); 323 324 /* Was RPC accepted? (authorization OK) */ 325 if (reply->rp_astatus != 0) { 326 /* Note: This is NOT an error code! */ 327 error = fxdr_unsigned(u_int32_t, reply->rp_rstat); 328 switch (error) { 329 case RPC_MISMATCH: 330 /* .re_status = RPC_VERSMISMATCH; */ 331 error = ERPCMISMATCH; 332 break; 333 case RPC_AUTHERR: 334 /* .re_status = RPC_AUTHERROR; */ 335 error = EAUTH; 336 break; 337 default: 338 /* unexpected */ 339 error = EBADRPC; 340 break; 341 } 342 goto out; 343 } 344 345 /* Did the call succeed? */ 346 if (reply->rp_status != 0) { 347 /* Note: This is NOT an error code! */ 348 error = fxdr_unsigned(u_int32_t, reply->rp_status); 349 switch (error) { 350 case RPC_PROGUNAVAIL: 351 error = EPROGUNAVAIL; 352 break; 353 case RPC_PROGMISMATCH: 354 error = EPROGMISMATCH; 355 break; 356 case RPC_PROCUNAVAIL: 357 error = EPROCUNAVAIL; 358 break; 359 case RPC_GARBAGE: 360 default: 361 error = EBADRPC; 362 } 363 goto out; 364 } 365 366 /* 367 * OK, we have received a good reply! 368 * Get its length, then strip it off. 369 */ 370 len = sizeof(*reply); 371 if (reply->rp_auth.authtype != 0) { 372 len += fxdr_unsigned(u_int32_t, reply->rp_auth.authlen); 373 len = (len + 3) & ~3; /* XXX? */ 374 } 375 m_adj(m, len); 376 377 /* result */ 378 *data = m; 379 if (from_p) { 380 *from_p = from; 381 from = NULL; 382 } 383 384 out: 385 if (nam) m_freem(nam); 386 if (mhead) m_freem(mhead); 387 if (from) m_freem(from); 388 soclose(so); 389 return error; 390 } 391 392 /* 393 * eXternal Data Representation routines. 394 * (but with non-standard args...) 395 */ 396 397 /* 398 * String representation for RPC. 399 */ 400 struct xdr_string { 401 u_int32_t len; /* length without null or padding */ 402 char data[4]; /* data (longer, of course) */ 403 /* data is padded to a long-word boundary */ 404 }; 405 406 struct mbuf * 407 xdr_string_encode(str, len) 408 char *str; 409 int len; 410 { 411 struct mbuf *m; 412 struct xdr_string *xs; 413 int dlen; /* padded string length */ 414 int mlen; /* message length */ 415 416 dlen = (len + 3) & ~3; 417 mlen = dlen + 4; 418 419 if (mlen > MCLBYTES) /* If too big, we just can't do it. */ 420 return (NULL); 421 422 m = m_get(M_WAIT, MT_DATA); 423 if (mlen > MLEN) { 424 MCLGET(m, M_WAIT); 425 if ((m->m_flags & M_EXT) == 0) { 426 (void) m_free(m); /* There can be only one. */ 427 return (NULL); 428 } 429 } 430 xs = mtod(m, struct xdr_string *); 431 m->m_len = mlen; 432 xs->len = txdr_unsigned(len); 433 bcopy(str, xs->data, len); 434 return (m); 435 } 436 437 struct mbuf * 438 xdr_string_decode(m, str, len_p) 439 struct mbuf *m; 440 char *str; 441 int *len_p; /* bufsize - 1 */ 442 { 443 struct xdr_string *xs; 444 int mlen; /* message length */ 445 int slen; /* string length */ 446 447 if (m->m_len < 4) { 448 m = m_pullup(m, 4); 449 if (m == NULL) 450 return (NULL); 451 } 452 xs = mtod(m, struct xdr_string *); 453 slen = fxdr_unsigned(u_int32_t, xs->len); 454 mlen = 4 + ((slen + 3) & ~3); 455 456 if (slen > *len_p) 457 slen = *len_p; 458 m_copydata(m, 4, slen, str); 459 m_adj(m, mlen); 460 461 str[slen] = '\0'; 462 *len_p = slen; 463 464 return (m); 465 } 466 467 468 /* 469 * Inet address in RPC messages 470 * (Note, really four ints, NOT chars. Blech.) 471 */ 472 struct xdr_inaddr { 473 u_int32_t atype; 474 u_int32_t addr[4]; 475 }; 476 477 struct mbuf * 478 xdr_inaddr_encode(ia) 479 struct in_addr *ia; /* already in network order */ 480 { 481 struct mbuf *m; 482 struct xdr_inaddr *xi; 483 u_int8_t *cp; 484 u_int32_t *ip; 485 486 m = m_get(M_WAIT, MT_DATA); 487 xi = mtod(m, struct xdr_inaddr *); 488 m->m_len = sizeof(*xi); 489 xi->atype = txdr_unsigned(1); 490 ip = xi->addr; 491 cp = (u_int8_t *)&ia->s_addr; 492 *ip++ = txdr_unsigned(*cp++); 493 *ip++ = txdr_unsigned(*cp++); 494 *ip++ = txdr_unsigned(*cp++); 495 *ip++ = txdr_unsigned(*cp++); 496 497 return (m); 498 } 499 500 struct mbuf * 501 xdr_inaddr_decode(m, ia) 502 struct mbuf *m; 503 struct in_addr *ia; /* already in network order */ 504 { 505 struct xdr_inaddr *xi; 506 u_int8_t *cp; 507 u_int32_t *ip; 508 509 if (m->m_len < sizeof(*xi)) { 510 m = m_pullup(m, sizeof(*xi)); 511 if (m == NULL) 512 return (NULL); 513 } 514 xi = mtod(m, struct xdr_inaddr *); 515 if (xi->atype != txdr_unsigned(1)) { 516 ia->s_addr = INADDR_ANY; 517 goto out; 518 } 519 ip = xi->addr; 520 cp = (u_int8_t *)&ia->s_addr; 521 *cp++ = fxdr_unsigned(u_int8_t, *ip++); 522 *cp++ = fxdr_unsigned(u_int8_t, *ip++); 523 *cp++ = fxdr_unsigned(u_int8_t, *ip++); 524 *cp++ = fxdr_unsigned(u_int8_t, *ip++); 525 526 out: 527 m_adj(m, sizeof(*xi)); 528 return (m); 529 } 530
Indexes created Mon Sep 29 21:09:56 GMT 2025