krpc_subr.c revision 1.13
1 /* $NetBSD: krpc_subr.c,v 1.13 1996/06/07 00:48:10 cgd 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 63 /* 64 * Kernel support for Sun RPC 65 * 66 * Used currently for bootstrapping in nfs diskless configurations. 67 */ 68 69 /* 70 * Generic RPC headers 71 */ 72 73 struct auth_info { 74 u_int32_t authtype; /* auth type */ 75 u_int32_t authlen; /* auth length */ 76 }; 77 78 struct auth_unix { 79 int32_t ua_time; 80 int32_t ua_hostname; /* null */ 81 int32_t ua_uid; 82 int32_t ua_gid; 83 int32_t ua_gidlist; /* null */ 84 }; 85 86 struct rpc_call { 87 u_int32_t rp_xid; /* request transaction id */ 88 int32_t rp_direction; /* call direction (0) */ 89 u_int32_t rp_rpcvers; /* rpc version (2) */ 90 u_int32_t rp_prog; /* program */ 91 u_int32_t rp_vers; /* version */ 92 u_int32_t rp_proc; /* procedure */ 93 struct auth_info rpc_auth; 94 struct auth_unix rpc_unix; 95 struct auth_info rpc_verf; 96 }; 97 98 struct rpc_reply { 99 u_int32_t rp_xid; /* request transaction id */ 100 int32_t rp_direction; /* call direction (1) */ 101 int32_t rp_astatus; /* accept status (0: accepted) */ 102 union { 103 u_int32_t rpu_errno; 104 struct { 105 struct auth_info rok_auth; 106 u_int32_t rok_status; 107 } rpu_rok; 108 } rp_u; 109 }; 110 #define rp_errno rp_u.rpu_errno 111 #define rp_auth rp_u.rpu_rok.rok_auth 112 #define rp_status rp_u.rpu_rok.rok_status 113 114 #define MIN_REPLY_HDR 16 /* xid, dir, astat, errno */ 115 116 /* 117 * What is the longest we will wait before re-sending a request? 118 * Note this is also the frequency of "RPC timeout" messages. 119 * The re-send loop count sup linearly to this maximum, so the 120 * first complaint will happen after (1+2+3+4+5)=15 seconds. 121 */ 122 #define MAX_RESEND_DELAY 5 /* seconds */ 123 124 /* 125 * Call portmap to lookup a port number for a particular rpc program 126 * Returns non-zero error on failure. 127 */ 128 int 129 krpc_portmap(sin, prog, vers, portp) 130 struct sockaddr_in *sin; /* server address */ 131 u_int prog, vers; /* host order */ 132 u_int16_t *portp; /* network order */ 133 { 134 struct sdata { 135 u_int32_t prog; /* call program */ 136 u_int32_t vers; /* call version */ 137 u_int32_t proto; /* call protocol */ 138 u_int32_t port; /* call port (unused) */ 139 } *sdata; 140 struct rdata { 141 u_int16_t pad; 142 u_int16_t port; 143 } *rdata; 144 struct mbuf *m; 145 int error; 146 147 /* The portmapper port is fixed. */ 148 if (prog == PMAPPROG) { 149 *portp = htons(PMAPPORT); 150 return 0; 151 } 152 153 m = m_get(M_WAIT, MT_DATA); 154 if (m == NULL) 155 return ENOBUFS; 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(IPPROTO_UDP); 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 /* 184 * Do a remote procedure call (RPC) and wait for its reply. 185 * If from_p is non-null, then we are doing broadcast, and 186 * the address from whence the response came is saved there. 187 */ 188 int 189 krpc_call(sa, prog, vers, func, data, from_p) 190 struct sockaddr_in *sa; 191 u_int prog, vers, func; 192 struct mbuf **data; /* input/output */ 193 struct mbuf **from_p; /* output */ 194 { 195 struct socket *so; 196 struct sockaddr_in *sin; 197 struct mbuf *m, *nam, *mhead, *from; 198 struct rpc_call *call; 199 struct rpc_reply *reply; 200 struct uio auio; 201 int error, rcvflg, timo, secs, len; 202 static u_int32_t xid = ~0xFF; 203 u_int16_t tport; 204 205 /* 206 * Validate address family. 207 * Sorry, this is INET specific... 208 */ 209 if (sa->sin_family != AF_INET) 210 return (EAFNOSUPPORT); 211 212 /* Free at end if not null. */ 213 nam = mhead = NULL; 214 from = NULL; 215 216 /* 217 * Create socket and set its recieve timeout. 218 */ 219 if ((error = socreate(AF_INET, &so, SOCK_DGRAM, 0))) 220 goto out; 221 222 m = m_get(M_WAIT, MT_SOOPTS); 223 if (m == NULL) { 224 error = ENOBUFS; 225 goto out; 226 } else { 227 struct timeval *tv; 228 tv = mtod(m, struct timeval *); 229 m->m_len = sizeof(*tv); 230 tv->tv_sec = 1; 231 tv->tv_usec = 0; 232 if ((error = sosetopt(so, SOL_SOCKET, SO_RCVTIMEO, m))) 233 goto out; 234 } 235 236 /* 237 * Enable broadcast if necessary. 238 */ 239 if (from_p) { 240 int32_t *on; 241 m = m_get(M_WAIT, MT_SOOPTS); 242 if (m == NULL) { 243 error = ENOBUFS; 244 goto out; 245 } 246 on = mtod(m, int32_t *); 247 m->m_len = sizeof(*on); 248 *on = 1; 249 if ((error = sosetopt(so, SOL_SOCKET, SO_BROADCAST, m))) 250 goto out; 251 } 252 253 /* 254 * Bind the local endpoint to a reserved port, 255 * because some NFS servers refuse requests from 256 * non-reserved (non-privileged) ports. 257 */ 258 m = m_getclr(M_WAIT, MT_SONAME); 259 sin = mtod(m, struct sockaddr_in *); 260 sin->sin_len = m->m_len = sizeof(*sin); 261 sin->sin_family = AF_INET; 262 sin->sin_addr.s_addr = INADDR_ANY; 263 tport = IPPORT_RESERVED; 264 do { 265 tport--; 266 sin->sin_port = htons(tport); 267 error = sobind(so, m); 268 } while (error == EADDRINUSE && 269 tport > IPPORT_RESERVED / 2); 270 m_freem(m); 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 if (nam == NULL) { 281 error = ENOBUFS; 282 goto out; 283 } 284 sin = mtod(nam, struct sockaddr_in *); 285 bcopy((caddr_t)sa, (caddr_t)sin, 286 (nam->m_len = sa->sin_len)); 287 288 /* 289 * Prepend RPC message header. 290 */ 291 mhead = m_gethdr(M_WAIT, MT_DATA); 292 mhead->m_next = *data; 293 call = mtod(mhead, struct rpc_call *); 294 mhead->m_len = sizeof(*call); 295 bzero((caddr_t)call, sizeof(*call)); 296 /* rpc_call part */ 297 xid++; 298 call->rp_xid = txdr_unsigned(xid); 299 /* call->rp_direction = 0; */ 300 call->rp_rpcvers = txdr_unsigned(2); 301 call->rp_prog = txdr_unsigned(prog); 302 call->rp_vers = txdr_unsigned(vers); 303 call->rp_proc = txdr_unsigned(func); 304 /* rpc_auth part (auth_unix as root) */ 305 call->rpc_auth.authtype = txdr_unsigned(RPCAUTH_UNIX); 306 call->rpc_auth.authlen = txdr_unsigned(sizeof(struct auth_unix)); 307 /* rpc_verf part (auth_null) */ 308 call->rpc_verf.authtype = 0; 309 call->rpc_verf.authlen = 0; 310 311 /* 312 * Setup packet header 313 */ 314 len = 0; 315 m = mhead; 316 while (m) { 317 len += m->m_len; 318 m = m->m_next; 319 } 320 mhead->m_pkthdr.len = len; 321 mhead->m_pkthdr.rcvif = NULL; 322 323 /* 324 * Send it, repeatedly, until a reply is received, 325 * but delay each re-send by an increasing amount. 326 * If the delay hits the maximum, start complaining. 327 */ 328 timo = 0; 329 for (;;) { 330 /* Send RPC request (or re-send). */ 331 m = m_copym(mhead, 0, M_COPYALL, M_WAIT); 332 if (m == NULL) { 333 error = ENOBUFS; 334 goto out; 335 } 336 error = sosend(so, nam, NULL, m, NULL, 0); 337 if (error) { 338 printf("krpc_call: sosend: %d\n", error); 339 goto out; 340 } 341 m = NULL; 342 343 /* Determine new timeout. */ 344 if (timo < MAX_RESEND_DELAY) 345 timo++; 346 else 347 printf("RPC timeout for server 0x%x\n", 348 ntohl(sin->sin_addr.s_addr)); 349 350 /* 351 * Wait for up to timo seconds for a reply. 352 * The socket receive timeout was set to 1 second. 353 */ 354 secs = timo; 355 while (secs > 0) { 356 if (from) { 357 m_freem(from); 358 from = NULL; 359 } 360 if (m) { 361 m_freem(m); 362 m = NULL; 363 } 364 auio.uio_resid = len = 1<<16; 365 rcvflg = 0; 366 error = soreceive(so, &from, &auio, &m, NULL, &rcvflg); 367 if (error == EWOULDBLOCK) { 368 secs--; 369 continue; 370 } 371 if (error) 372 goto out; 373 len -= auio.uio_resid; 374 375 /* Does the reply contain at least a header? */ 376 if (len < MIN_REPLY_HDR) 377 continue; 378 if (m->m_len < MIN_REPLY_HDR) 379 continue; 380 reply = mtod(m, struct rpc_reply *); 381 382 /* Is it the right reply? */ 383 if (reply->rp_direction != txdr_unsigned(RPC_REPLY)) 384 continue; 385 386 if (reply->rp_xid != txdr_unsigned(xid)) 387 continue; 388 389 /* Was RPC accepted? (authorization OK) */ 390 if (reply->rp_astatus != 0) { 391 error = fxdr_unsigned(u_int32_t, reply->rp_errno); 392 printf("rpc denied, error=%d\n", error); 393 continue; 394 } 395 396 /* Did the call succeed? */ 397 if (reply->rp_status != 0) { 398 error = fxdr_unsigned(u_int32_t, reply->rp_status); 399 printf("rpc denied, status=%d\n", error); 400 continue; 401 } 402 403 goto gotreply; /* break two levels */ 404 405 } /* while secs */ 406 } /* forever send/receive */ 407 408 error = ETIMEDOUT; 409 goto out; 410 411 gotreply: 412 413 /* 414 * Get RPC reply header into first mbuf, 415 * get its length, then strip it off. 416 */ 417 len = sizeof(*reply); 418 if (m->m_len < len) { 419 m = m_pullup(m, len); 420 if (m == NULL) { 421 error = ENOBUFS; 422 goto out; 423 } 424 } 425 reply = mtod(m, struct rpc_reply *); 426 if (reply->rp_auth.authtype != 0) { 427 len += fxdr_unsigned(u_int32_t, reply->rp_auth.authlen); 428 len = (len + 3) & ~3; /* XXX? */ 429 } 430 m_adj(m, len); 431 432 /* result */ 433 *data = m; 434 if (from_p) { 435 *from_p = from; 436 from = NULL; 437 } 438 439 out: 440 if (nam) m_freem(nam); 441 if (mhead) m_freem(mhead); 442 if (from) m_freem(from); 443 soclose(so); 444 return error; 445 } 446 447 /* 448 * eXternal Data Representation routines. 449 * (but with non-standard args...) 450 */ 451 452 /* 453 * String representation for RPC. 454 */ 455 struct xdr_string { 456 u_int32_t len; /* length without null or padding */ 457 char data[4]; /* data (longer, of course) */ 458 /* data is padded to a long-word boundary */ 459 }; 460 461 struct mbuf * 462 xdr_string_encode(str, len) 463 char *str; 464 int len; 465 { 466 struct mbuf *m; 467 struct xdr_string *xs; 468 int dlen; /* padded string length */ 469 int mlen; /* message length */ 470 471 dlen = (len + 3) & ~3; 472 mlen = dlen + 4; 473 474 if (mlen > MCLBYTES) /* If too big, we just can't do it. */ 475 return (NULL); 476 477 m = m_get(M_WAIT, MT_DATA); 478 if (mlen > MLEN) { 479 MCLGET(m, M_WAIT); 480 if ((m->m_flags & M_EXT) == 0) { 481 (void) m_free(m); /* There can be only one. */ 482 return (NULL); 483 } 484 } 485 xs = mtod(m, struct xdr_string *); 486 m->m_len = mlen; 487 xs->len = txdr_unsigned(len); 488 bcopy(str, xs->data, len); 489 return (m); 490 } 491 492 struct mbuf * 493 xdr_string_decode(m, str, len_p) 494 struct mbuf *m; 495 char *str; 496 int *len_p; /* bufsize - 1 */ 497 { 498 struct xdr_string *xs; 499 int mlen; /* message length */ 500 int slen; /* string length */ 501 502 if (m->m_len < 4) { 503 m = m_pullup(m, 4); 504 if (m == NULL) 505 return (NULL); 506 } 507 xs = mtod(m, struct xdr_string *); 508 slen = fxdr_unsigned(u_int32_t, xs->len); 509 mlen = 4 + ((slen + 3) & ~3); 510 511 if (slen > *len_p) 512 slen = *len_p; 513 m_copydata(m, 4, slen, str); 514 m_adj(m, mlen); 515 516 str[slen] = '\0'; 517 *len_p = slen; 518 519 return (m); 520 } 521 522 523 /* 524 * Inet address in RPC messages 525 * (Note, really four ints, NOT chars. Blech.) 526 */ 527 struct xdr_inaddr { 528 u_int32_t atype; 529 u_int32_t addr[4]; 530 }; 531 532 struct mbuf * 533 xdr_inaddr_encode(ia) 534 struct in_addr *ia; /* already in network order */ 535 { 536 struct mbuf *m; 537 struct xdr_inaddr *xi; 538 u_int8_t *cp; 539 u_int32_t *ip; 540 541 m = m_get(M_WAIT, MT_DATA); 542 xi = mtod(m, struct xdr_inaddr *); 543 m->m_len = sizeof(*xi); 544 xi->atype = txdr_unsigned(1); 545 ip = xi->addr; 546 cp = (u_int8_t *)&ia->s_addr; 547 *ip++ = txdr_unsigned(*cp++); 548 *ip++ = txdr_unsigned(*cp++); 549 *ip++ = txdr_unsigned(*cp++); 550 *ip++ = txdr_unsigned(*cp++); 551 552 return (m); 553 } 554 555 struct mbuf * 556 xdr_inaddr_decode(m, ia) 557 struct mbuf *m; 558 struct in_addr *ia; /* already in network order */ 559 { 560 struct xdr_inaddr *xi; 561 u_int8_t *cp; 562 u_int32_t *ip; 563 564 if (m->m_len < sizeof(*xi)) { 565 m = m_pullup(m, sizeof(*xi)); 566 if (m == NULL) 567 return (NULL); 568 } 569 xi = mtod(m, struct xdr_inaddr *); 570 if (xi->atype != txdr_unsigned(1)) { 571 ia->s_addr = INADDR_ANY; 572 goto out; 573 } 574 ip = xi->addr; 575 cp = (u_int8_t *)&ia->s_addr; 576 *cp++ = fxdr_unsigned(u_int8_t, *ip++); 577 *cp++ = fxdr_unsigned(u_int8_t, *ip++); 578 *cp++ = fxdr_unsigned(u_int8_t, *ip++); 579 *cp++ = fxdr_unsigned(u_int8_t, *ip++); 580 581 out: 582 m_adj(m, sizeof(*xi)); 583 return (m); 584 } 585
Indexes created Sat Sep 27 22:09:54 GMT 2025