bootp.c revision 1.23
1 /* $NetBSD: bootp.c,v 1.23 2003/02/25 14:42:30 ragge Exp $ */ 2 3 /* 4 * Copyright (c) 1992 Regents of the University of California. 5 * All rights reserved. 6 * 7 * This software was developed by the Computer Systems Engineering group 8 * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and 9 * contributed to Berkeley. 10 * 11 * Redistribution and use in source and binary forms, with or without 12 * modification, are permitted provided that the following conditions 13 * are met: 14 * 1. Redistributions of source code must retain the above copyright 15 * notice, this list of conditions and the following disclaimer. 16 * 2. Redistributions in binary form must reproduce the above copyright 17 * notice, this list of conditions and the following disclaimer in the 18 * documentation and/or other materials provided with the distribution. 19 * 3. All advertising materials mentioning features or use of this software 20 * must display the following acknowledgement: 21 * This product includes software developed by the University of 22 * California, Lawrence Berkeley Laboratory and its contributors. 23 * 4. Neither the name of the University nor the names of its contributors 24 * may be used to endorse or promote products derived from this software 25 * without specific prior written permission. 26 * 27 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 28 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 29 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 30 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 31 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 32 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 33 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 34 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 35 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 36 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 37 * SUCH DAMAGE. 38 * 39 * @(#) Header: bootp.c,v 1.4 93/09/11 03:13:51 leres Exp (LBL) 40 */ 41 42 #include <sys/param.h> 43 #include <netinet/in.h> 44 #include <netinet/in_systm.h> 45 46 #ifdef _STANDALONE 47 #include <lib/libkern/libkern.h> 48 #else 49 #include <string.h> 50 #endif 51 52 #include "stand.h" 53 #include "net.h" 54 #include "netif.h" 55 #include "bootp.h" 56 57 struct in_addr servip; 58 #ifdef SUPPORT_LINUX 59 char linuxcmdline[256]; 60 #ifndef TAG_LINUX_CMDLINE 61 #define TAG_LINUX_CMDLINE 123 62 #endif 63 #endif 64 65 static n_long nmask, smask; 66 67 static time_t bot; 68 69 static char vm_rfc1048[4] = VM_RFC1048; 70 #ifdef BOOTP_VEND_CMU 71 static char vm_cmu[4] = VM_CMU; 72 #endif 73 74 /* Local forwards */ 75 static ssize_t bootpsend __P((struct iodesc *, void *, size_t)); 76 static ssize_t bootprecv __P((struct iodesc *, void *, size_t, time_t)); 77 static int vend_rfc1048 __P((u_char *, u_int)); 78 #ifdef BOOTP_VEND_CMU 79 static void vend_cmu __P((u_char *)); 80 #endif 81 82 #ifdef SUPPORT_DHCP 83 static char expected_dhcpmsgtype = -1, dhcp_ok; 84 struct in_addr dhcp_serverip; 85 #endif 86 87 /* 88 * Boot programs can patch this at run-time to change the behavior 89 * of bootp/dhcp. 90 */ 91 int bootp_flags; 92 93 /* Fetch required bootp information */ 94 void 95 bootp(sock) 96 int sock; 97 { 98 struct iodesc *d; 99 struct bootp *bp; 100 struct { 101 u_char header[HEADER_SIZE]; 102 struct bootp wbootp; 103 } wbuf; 104 struct { 105 u_char header[HEADER_SIZE]; 106 struct bootp rbootp; 107 } rbuf; 108 #ifdef SUPPORT_DHCP 109 char vci[64]; 110 int vcilen; 111 #endif 112 113 #ifdef BOOTP_DEBUG 114 if (debug) 115 printf("bootp: socket=%d\n", sock); 116 #endif 117 if (!bot) 118 bot = getsecs(); 119 120 if (!(d = socktodesc(sock))) { 121 printf("bootp: bad socket. %d\n", sock); 122 return; 123 } 124 #ifdef BOOTP_DEBUG 125 if (debug) 126 printf("bootp: d=%lx\n", (long)d); 127 #endif 128 129 bp = &wbuf.wbootp; 130 bzero(bp, sizeof(*bp)); 131 132 bp->bp_op = BOOTREQUEST; 133 bp->bp_htype = 1; /* 10Mb Ethernet (48 bits) */ 134 bp->bp_hlen = 6; 135 bp->bp_xid = htonl(d->xid); 136 MACPY(d->myea, bp->bp_chaddr); 137 strncpy(bp->bp_file, bootfile, sizeof(bp->bp_file)); 138 bcopy(vm_rfc1048, bp->bp_vend, sizeof(vm_rfc1048)); 139 #ifdef SUPPORT_DHCP 140 bp->bp_vend[4] = TAG_DHCP_MSGTYPE; 141 bp->bp_vend[5] = 1; 142 bp->bp_vend[6] = DHCPDISCOVER; 143 /* 144 * Insert a NetBSD Vendor Class Identifier option. 145 */ 146 sprintf(vci, "NetBSD:%s:libsa", MACHINE); 147 vcilen = strlen(vci); 148 bp->bp_vend[7] = TAG_CLASSID; 149 bp->bp_vend[8] = vcilen; 150 bcopy(vci, &bp->bp_vend[9], vcilen); 151 bp->bp_vend[9 + vcilen] = TAG_END; 152 #else 153 bp->bp_vend[4] = TAG_END; 154 #endif 155 156 d->myip.s_addr = INADDR_ANY; 157 d->myport = htons(IPPORT_BOOTPC); 158 d->destip.s_addr = INADDR_BROADCAST; 159 d->destport = htons(IPPORT_BOOTPS); 160 161 #ifdef SUPPORT_DHCP 162 expected_dhcpmsgtype = DHCPOFFER; 163 dhcp_ok = 0; 164 #endif 165 166 if (sendrecv(d, 167 bootpsend, bp, sizeof(*bp), 168 bootprecv, &rbuf.rbootp, sizeof(rbuf.rbootp)) 169 == -1) { 170 printf("bootp: no reply\n"); 171 return; 172 } 173 174 #ifdef SUPPORT_DHCP 175 if (dhcp_ok) { 176 u_int32_t leasetime; 177 bp->bp_vend[6] = DHCPREQUEST; 178 bp->bp_vend[7] = TAG_REQ_ADDR; 179 bp->bp_vend[8] = 4; 180 bcopy(&rbuf.rbootp.bp_yiaddr, &bp->bp_vend[9], 4); 181 bp->bp_vend[13] = TAG_SERVERID; 182 bp->bp_vend[14] = 4; 183 bcopy(&dhcp_serverip.s_addr, &bp->bp_vend[15], 4); 184 bp->bp_vend[19] = TAG_LEASETIME; 185 bp->bp_vend[20] = 4; 186 leasetime = htonl(300); 187 bcopy(&leasetime, &bp->bp_vend[21], 4); 188 /* 189 * Insert a NetBSD Vendor Class Identifier option. 190 */ 191 sprintf(vci, "NetBSD:%s:libsa", MACHINE); 192 vcilen = strlen(vci); 193 bp->bp_vend[25] = TAG_CLASSID; 194 bp->bp_vend[26] = vcilen; 195 bcopy(vci, &bp->bp_vend[27], vcilen); 196 bp->bp_vend[27 + vcilen] = TAG_END; 197 198 expected_dhcpmsgtype = DHCPACK; 199 200 if (sendrecv(d, 201 bootpsend, bp, sizeof(*bp), 202 bootprecv, &rbuf.rbootp, sizeof(rbuf.rbootp)) 203 == -1) { 204 printf("DHCPREQUEST failed\n"); 205 return; 206 } 207 } 208 #endif 209 210 myip = d->myip = rbuf.rbootp.bp_yiaddr; 211 servip = rbuf.rbootp.bp_siaddr; 212 if (rootip.s_addr == INADDR_ANY) 213 rootip = servip; 214 bcopy(rbuf.rbootp.bp_file, bootfile, sizeof(bootfile)); 215 bootfile[sizeof(bootfile) - 1] = '\0'; 216 217 if (IN_CLASSA(myip.s_addr)) 218 nmask = IN_CLASSA_NET; 219 else if (IN_CLASSB(myip.s_addr)) 220 nmask = IN_CLASSB_NET; 221 else 222 nmask = IN_CLASSC_NET; 223 #ifdef BOOTP_DEBUG 224 if (debug) 225 printf("'native netmask' is %s\n", intoa(nmask)); 226 #endif 227 228 /* Get subnet (or natural net) mask */ 229 netmask = nmask; 230 if (smask) 231 netmask = smask; 232 #ifdef BOOTP_DEBUG 233 if (debug) 234 printf("mask: %s\n", intoa(netmask)); 235 #endif 236 237 /* We need a gateway if root is on a different net */ 238 if (!SAMENET(myip, rootip, netmask)) { 239 #ifdef BOOTP_DEBUG 240 if (debug) 241 printf("need gateway for root ip\n"); 242 #endif 243 } 244 245 /* Toss gateway if on a different net */ 246 if (!SAMENET(myip, gateip, netmask)) { 247 #ifdef BOOTP_DEBUG 248 if (debug) 249 printf("gateway ip (%s) bad\n", inet_ntoa(gateip)); 250 #endif 251 gateip.s_addr = 0; 252 } 253 254 printf("net_open: client addr: %s\n", inet_ntoa(myip)); 255 if (smask) 256 printf("net_open: subnet mask: %s\n", intoa(smask)); 257 if (gateip.s_addr != 0) 258 printf("net_open: net gateway: %s\n", inet_ntoa(gateip)); 259 printf("net_open: server addr: %s\n", inet_ntoa(rootip)); 260 if (rootpath[0] != '\0') 261 printf("net_open: server path: %s\n", rootpath); 262 if (bootfile[0] != '\0') 263 printf("net_open: file name: %s\n", bootfile); 264 265 /* Bump xid so next request will be unique. */ 266 ++d->xid; 267 } 268 269 /* Transmit a bootp request */ 270 static ssize_t 271 bootpsend(d, pkt, len) 272 struct iodesc *d; 273 void *pkt; 274 size_t len; 275 { 276 struct bootp *bp; 277 278 #ifdef BOOTP_DEBUG 279 if (debug) 280 printf("bootpsend: d=%lx called.\n", (long)d); 281 #endif 282 283 bp = pkt; 284 bp->bp_secs = htons((u_short)(getsecs() - bot)); 285 286 #ifdef BOOTP_DEBUG 287 if (debug) 288 printf("bootpsend: calling sendudp\n"); 289 #endif 290 291 return (sendudp(d, pkt, len)); 292 } 293 294 static ssize_t 295 bootprecv(d, pkt, len, tleft) 296 struct iodesc *d; 297 void *pkt; 298 size_t len; 299 time_t tleft; 300 { 301 ssize_t n; 302 struct bootp *bp; 303 304 #ifdef BOOTP_DEBUGx 305 if (debug) 306 printf("bootp_recvoffer: called\n"); 307 #endif 308 309 n = readudp(d, pkt, len, tleft); 310 if (n == -1 || n < sizeof(struct bootp) - BOOTP_VENDSIZE) 311 goto bad; 312 313 bp = (struct bootp *)pkt; 314 315 #ifdef BOOTP_DEBUG 316 if (debug) 317 printf("bootprecv: checked. bp = 0x%lx, n = %d\n", 318 (long)bp, (int)n); 319 #endif 320 if (bp->bp_xid != htonl(d->xid)) { 321 #ifdef BOOTP_DEBUG 322 if (debug) { 323 printf("bootprecv: expected xid 0x%lx, got 0x%x\n", 324 d->xid, ntohl(bp->bp_xid)); 325 } 326 #endif 327 goto bad; 328 } 329 330 /* protect against bogus addresses sent by DHCP servers */ 331 if (bp->bp_yiaddr.s_addr == INADDR_ANY || 332 bp->bp_yiaddr.s_addr == INADDR_BROADCAST) 333 goto bad; 334 335 #ifdef BOOTP_DEBUG 336 if (debug) 337 printf("bootprecv: got one!\n"); 338 #endif 339 340 /* Suck out vendor info */ 341 if (bcmp(vm_rfc1048, bp->bp_vend, sizeof(vm_rfc1048)) == 0) { 342 if (vend_rfc1048(bp->bp_vend, sizeof(bp->bp_vend)) != 0) 343 goto bad; 344 } 345 #ifdef BOOTP_VEND_CMU 346 else if (bcmp(vm_cmu, bp->bp_vend, sizeof(vm_cmu)) == 0) 347 vend_cmu(bp->bp_vend); 348 #endif 349 else 350 printf("bootprecv: unknown vendor 0x%lx\n", (long)bp->bp_vend); 351 352 return (n); 353 bad: 354 errno = 0; 355 return (-1); 356 } 357 358 static int 359 vend_rfc1048(cp, len) 360 u_char *cp; 361 u_int len; 362 { 363 u_char *ep; 364 int size; 365 u_char tag; 366 367 #ifdef BOOTP_DEBUG 368 if (debug) 369 printf("vend_rfc1048 bootp info. len=%d\n", len); 370 #endif 371 ep = cp + len; 372 373 /* Step over magic cookie */ 374 cp += sizeof(int); 375 376 while (cp < ep) { 377 tag = *cp++; 378 size = *cp++; 379 if (tag == TAG_END) 380 break; 381 382 if (tag == TAG_SUBNET_MASK) { 383 bcopy(cp, &smask, sizeof(smask)); 384 } 385 if (tag == TAG_GATEWAY) { 386 bcopy(cp, &gateip.s_addr, sizeof(gateip.s_addr)); 387 } 388 if (tag == TAG_SWAPSERVER) { 389 /* let it override bp_siaddr */ 390 bcopy(cp, &rootip.s_addr, sizeof(rootip.s_addr)); 391 } 392 if (tag == TAG_ROOTPATH) { 393 strncpy(rootpath, (char *)cp, sizeof(rootpath)); 394 rootpath[size] = '\0'; 395 } 396 if (tag == TAG_HOSTNAME) { 397 strncpy(hostname, (char *)cp, sizeof(hostname)); 398 hostname[size] = '\0'; 399 } 400 #ifdef SUPPORT_DHCP 401 if (tag == TAG_DHCP_MSGTYPE) { 402 if (*cp != expected_dhcpmsgtype) 403 return (-1); 404 dhcp_ok = 1; 405 } 406 if (tag == TAG_SERVERID) { 407 bcopy(cp, &dhcp_serverip.s_addr, 408 sizeof(dhcp_serverip.s_addr)); 409 } 410 #endif 411 #ifdef SUPPORT_LINUX 412 if (tag == TAG_LINUX_CMDLINE) { 413 strncpy(linuxcmdline, (char *)cp, sizeof(linuxcmdline)); 414 linuxcmdline[size] = '\0'; 415 } 416 #endif 417 cp += size; 418 } 419 return (0); 420 } 421 422 #ifdef BOOTP_VEND_CMU 423 static void 424 vend_cmu(cp) 425 u_char *cp; 426 { 427 struct cmu_vend *vp; 428 429 #ifdef BOOTP_DEBUG 430 if (debug) 431 printf("vend_cmu bootp info.\n"); 432 #endif 433 vp = (struct cmu_vend *)cp; 434 435 if (vp->v_smask.s_addr != 0) { 436 smask = vp->v_smask.s_addr; 437 } 438 if (vp->v_dgate.s_addr != 0) { 439 gateip = vp->v_dgate; 440 } 441 } 442 #endif 443
Indexes created Fri Oct 03 02:09:57 GMT 2025