krpc_subr.c revision 1.24
1 /* $NetBSD: krpc_subr.c,v 1.24 2001/06/12 15:17:28 wiz 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/nfs.h> 64 #include <nfs/nfsmount.h> 65 #include <nfs/nfsdiskless.h> /* XXX decl nfs_boot_sendrecv */ 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 { 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 */ 88 }; 89 90 struct rpc_call { 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 */ 97 struct auth_info rpc_auth; 98 struct auth_unix rpc_unix; 99 struct auth_info rpc_verf; 100 }; 101 102 struct rpc_reply { 103 u_int32_t rp_xid; /* request transaction id */ 104 int32_t rp_direction; /* call direction (1) */ 105 int32_t rp_astatus; /* accept status (0: accepted) */ 106 union { 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 */ 114 struct { 115 struct auth_info rok_auth; 116 u_int32_t rok_status; 117 } rpu_rok; 118 } rp_u; 119 }; 120 #define rp_rstat rp_u.rpu_rej.rej_stat 121 #define rp_auth rp_u.rpu_rok.rok_auth 122 #define rp_status rp_u.rpu_rok.rok_status 123 124 #define MIN_REPLY_HDR 16 /* xid, dir, astat, errno */ 125 126 static int krpccheck __P((struct mbuf*, void*)); 127 128 /* 129 * Call portmap to lookup a port number for a particular rpc program 130 * Returns non-zero error on failure. 131 */ 132 int 133 krpc_portmap(sin, prog, vers, proto, portp) 134 struct sockaddr_in *sin; /* server address */ 135 u_int prog, vers, proto; /* host order */ 136 u_int16_t *portp; /* network order */ 137 { 138 struct sdata { 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) */ 143 } *sdata; 144 struct rdata { 145 u_int16_t pad; 146 u_int16_t port; 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 } 156 157 m = m_get(M_WAIT, MT_DATA); 158 sdata = mtod(m, struct sdata *); 159 m->m_len = sizeof(*sdata); 160 161 /* Do the RPC to get it. */ 162 sdata->prog = txdr_unsigned(prog); 163 sdata->vers = txdr_unsigned(vers); 164 sdata->proto = txdr_unsigned(proto); 165 sdata->port = 0; 166 167 sin->sin_port = htons(PMAPPORT); 168 error = krpc_call(sin, PMAPPROG, PMAPVERS, 169 PMAPPROC_GETPORT, &m, NULL); 170 if (error) 171 return error; 172 173 if (m->m_len < sizeof(*rdata)) { 174 m = m_pullup(m, sizeof(*rdata)); 175 if (m == NULL) 176 return ENOBUFS; 177 } 178 rdata = mtod(m, struct rdata *); 179 *portp = rdata->port; 180 181 m_freem(m); 182 return 0; 183 } 184 185 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 } 210 211 /* 212 * Do a remote procedure call (RPC) and wait for its reply. 213 * If from_p is non-null, then we are doing broadcast, and 214 * the address from whence the response came is saved there. 215 */ 216 int 217 krpc_call(sa, prog, vers, func, data, from_p) 218 struct sockaddr_in *sa; 219 u_int prog, vers, func; 220 struct mbuf **data; /* input/output */ 221 struct mbuf **from_p; /* output */ 222 { 223 struct socket *so; 224 struct sockaddr_in *sin; 225 struct mbuf *m, *nam, *mhead, *from; 226 struct rpc_call *call; 227 struct rpc_reply *reply; 228 int error, len; 229 static u_int32_t xid = ~0xFF; 230 u_int16_t tport; 231 232 /* 233 * Validate address family. 234 * Sorry, this is INET specific... 235 */ 236 if (sa->sin_family != AF_INET) 237 return (EAFNOSUPPORT); 238 239 /* Free at end if not null. */ 240 nam = mhead = NULL; 241 from = NULL; 242 243 /* 244 * Create socket and set its receive timeout. 245 */ 246 if ((error = socreate(AF_INET, &so, SOCK_DGRAM, 0))) 247 goto out; 248 249 if ((error = nfs_boot_setrecvtimo(so))) 250 goto out; 251 252 /* 253 * Enable broadcast if necessary. 254 */ 255 if (from_p) { 256 if ((error = nfs_boot_enbroadcast(so))) 257 goto out; 258 } 259 260 /* 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--; 268 error = nfs_boot_sobind_ipport(so, tport); 269 } while (error == EADDRINUSE && 270 tport > IPPORT_RESERVED / 2); 271 if (error) { 272 printf("bind failed\n"); 273 goto out; 274 } 275 276 /* 277 * Setup socket address for the server. 278 */ 279 nam = m_get(M_WAIT, MT_SONAME); 280 sin = mtod(nam, struct sockaddr_in *); 281 memcpy((caddr_t)sin, (caddr_t)sa, 282 (nam->m_len = sa->sin_len)); 283 284 /* 285 * Prepend RPC message header. 286 */ 287 mhead = m_gethdr(M_WAIT, MT_DATA); 288 mhead->m_next = *data; 289 call = mtod(mhead, struct rpc_call *); 290 mhead->m_len = sizeof(*call); 291 memset((caddr_t)call, 0, sizeof(*call)); 292 /* rpc_call part */ 293 xid++; 294 call->rp_xid = txdr_unsigned(xid); 295 /* call->rp_direction = 0; */ 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); 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; 306 307 /* 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; 318 319 error = nfs_boot_sendrecv(so, nam, 0, mhead, krpccheck, &m, &from, &xid); 320 if (error) 321 goto out; 322 323 /* m_pullup() was done in krpccheck() */ 324 reply = mtod(m, struct rpc_reply *); 325 326 /* 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; 343 } 344 goto out; 345 } 346 347 /* 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; 364 } 365 goto out; 366 } 367 368 /* 369 * OK, we have received a good reply! 370 * Get its length, then strip it off. 371 */ 372 len = sizeof(*reply); 373 if (reply->rp_auth.authtype != 0) { 374 len += fxdr_unsigned(u_int32_t, reply->rp_auth.authlen); 375 len = (len + 3) & ~3; /* XXX? */ 376 } 377 m_adj(m, len); 378 379 /* result */ 380 *data = m; 381 if (from_p) { 382 *from_p = from; 383 from = NULL; 384 } 385 386 out: 387 if (nam) m_freem(nam); 388 if (mhead) m_freem(mhead); 389 if (from) m_freem(from); 390 soclose(so); 391 return error; 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; 420 421 if (mlen > MCLBYTES) /* If too big, we just can't do it. */ 422 return (NULL); 423 424 m = m_get(M_WAIT, MT_DATA); 425 if (mlen > MLEN) { 426 MCLGET(m, M_WAIT); 427 if ((m->m_flags & M_EXT) == 0) { 428 (void) m_free(m); /* There can be only one. */ 429 return (NULL); 430 } 431 } 432 xs = mtod(m, struct xdr_string *); 433 m->m_len = mlen; 434 xs->len = txdr_unsigned(len); 435 memcpy(xs->data, str, len); 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 *); 455 slen = fxdr_unsigned(u_int32_t, xs->len); 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 { 475 u_int32_t atype; 476 u_int32_t addr[4]; 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; 485 u_int8_t *cp; 486 u_int32_t *ip; 487 488 m = m_get(M_WAIT, MT_DATA); 489 xi = mtod(m, struct xdr_inaddr *); 490 m->m_len = sizeof(*xi); 491 xi->atype = txdr_unsigned(1); 492 ip = xi->addr; 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++); 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; 508 u_int8_t *cp; 509 u_int32_t *ip; 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 *); 517 if (xi->atype != txdr_unsigned(1)) { 518 ia->s_addr = INADDR_ANY; 519 goto out; 520 } 521 ip = xi->addr; 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++); 527 528 out: 529 m_adj(m, sizeof(*xi)); 530 return (m); 531 } 532
Indexes created Sun Sep 28 12:09:53 GMT 2025