bootp.c revision 1.3
1 /* $NetBSD: bootp.c,v 1.3 1995/02/20 11:04:04 mycroft 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/types.h> 43 #include <netinet/in.h> 44 #include <netinet/in_systm.h> 45 46 #include <string.h> 47 48 #include "stand.h" 49 #include "net.h" 50 #include "netif.h" 51 #include "bootp.h" 52 53 static n_long nmask, smask; 54 55 static time_t bot; 56 57 static char vm_rfc1048[4] = VM_RFC1048; 58 static char vm_cmu[4] = VM_CMU; 59 60 /* Local forwards */ 61 static size_t bootpsend __P((struct iodesc *, void *, size_t)); 62 static size_t bootprecv __P((struct iodesc *, void *, size_t, time_t)); 63 static void vend_cmu __P((u_char *)); 64 static void vend_rfc1048 __P((u_char *, u_int)); 65 66 /* Fetch required bootp infomation */ 67 void 68 bootp(sock) 69 int sock; 70 { 71 struct iodesc *d; 72 register struct bootp *bp; 73 struct { 74 u_char header[HEADER_SIZE]; 75 struct bootp wbootp; 76 } wbuf; 77 struct { 78 u_char header[HEADER_SIZE]; 79 struct bootp rbootp; 80 } rbuf; 81 82 #ifdef BOOTP_DEBUG 83 if (debug) 84 printf("bootp: socket=%d\n", sock); 85 #endif 86 if (!bot) 87 bot = getsecs(); 88 89 if (!(d = socktodesc(sock))) { 90 printf("bootp: bad socket. %d\n", sock); 91 return; 92 } 93 #ifdef BOOTP_DEBUG 94 if (debug) 95 printf("bootp: d=%x\n", (u_int)d); 96 #endif 97 bp = &wbuf.wbootp; 98 bzero(bp, sizeof(*bp)); 99 100 bp->bp_op = BOOTREQUEST; 101 bp->bp_htype = 1; /* 10Mb Ethernet (48 bits) */ 102 bp->bp_hlen = 6; 103 MACPY(d->myea, bp->bp_chaddr); 104 105 d->xid = 0; 106 d->myip = myip; 107 d->myport = IPPORT_BOOTPC; 108 d->destip = INADDR_BROADCAST; 109 d->destport = IPPORT_BOOTPS; 110 111 (void)sendrecv(d, 112 bootpsend, bp, sizeof(*bp), 113 bootprecv, &rbuf.rbootp, sizeof(rbuf.rbootp)); 114 } 115 116 /* Transmit a bootp request */ 117 static size_t 118 bootpsend(d, pkt, len) 119 register struct iodesc *d; 120 register void *pkt; 121 register size_t len; 122 { 123 register struct bootp *bp; 124 125 #ifdef BOOTP_DEBUG 126 if (debug) 127 printf("bootpsend: d=%x called.\n", (u_int)d); 128 #endif 129 130 bp = pkt; 131 bzero(bp->bp_file, sizeof(bp->bp_file)); 132 133 bcopy(vm_rfc1048, bp->bp_vend, sizeof(long)); 134 bp->bp_xid = d->xid; 135 bp->bp_secs = (u_long)(getsecs() - bot); 136 137 #ifdef BOOTP_DEBUG 138 if (debug) 139 printf("bootpsend: calling sendudp\n"); 140 #endif 141 142 return (sendudp(d, pkt, len)); 143 } 144 145 /* Returns 0 if this is the packet we're waiting for else -1 (and errno == 0) */ 146 static size_t 147 bootprecv(d, pkt, len, tleft) 148 register struct iodesc *d; 149 register void *pkt; 150 register size_t len; 151 time_t tleft; 152 { 153 register struct bootp *bp; 154 155 #ifdef BOOTP_DEBUG 156 if (debug) 157 printf("bootprecv: called\n"); 158 #endif 159 160 len = readudp(d, pkt, len, tleft); 161 if (len == -1 || len < sizeof(struct bootp)) 162 goto bad; 163 164 bp = (struct bootp *)pkt; 165 NTOHL(bp->bp_xid); 166 167 #ifdef BOOTP_DEBUG 168 if (debug) 169 printf("bootprecv: checked. bp = 0x%x, len = %d\n", 170 (unsigned)bp, len); 171 #endif 172 if (bp->bp_xid != d->xid) { 173 #ifdef BOOTP_DEBUG 174 if (debug) { 175 printf("bootprecv: expected xid 0x%x, got 0x%x\n", 176 d->xid, bp->bp_xid); 177 } 178 #endif 179 goto bad; 180 } 181 182 /* Bump xid so next request will be unique. */ 183 ++d->xid; 184 185 #ifdef BOOTP_DEBUG 186 if (debug) 187 printf("bootprecv: got one!\n"); 188 #endif 189 190 /* Pick up our ip address (and natural netmask) */ 191 myip = d->myip = ntohl(bp->bp_yiaddr.s_addr); 192 #ifdef BOOTP_DEBUG 193 if (debug) 194 printf("our ip address is %s\n", intoa(d->myip)); 195 #endif 196 if (IN_CLASSA(d->myip)) 197 nmask = IN_CLASSA_NET; 198 else if (IN_CLASSB(d->myip)) 199 nmask = IN_CLASSB_NET; 200 else 201 nmask = IN_CLASSC_NET; 202 #ifdef BOOTP_DEBUG 203 if (debug) 204 printf("'native netmask' is %s\n", intoa(nmask)); 205 #endif 206 207 /* Pick up root or swap server address and file spec. */ 208 if (bp->bp_siaddr.s_addr != 0) 209 rootip = ntohl(bp->bp_siaddr.s_addr); 210 if (bp->bp_file[0] != '\0') { 211 strncpy(bootfile, (char *)bp->bp_file, sizeof(bootfile)); 212 bootfile[sizeof(bootfile) - 1] = '\0'; 213 } 214 215 /* Suck out vendor info */ 216 if (bcmp(vm_cmu, bp->bp_vend, sizeof(vm_cmu)) == 0) 217 vend_cmu(bp->bp_vend); 218 else if (bcmp(vm_rfc1048, bp->bp_vend, sizeof(vm_rfc1048)) == 0) 219 vend_rfc1048(bp->bp_vend, sizeof(bp->bp_vend)); 220 else 221 printf("bootprecv: unknown vendor 0x%x\n", (int)bp->bp_vend); 222 223 /* Check subnet mask against net mask; toss if bogus */ 224 if ((nmask & smask) != nmask) { 225 #ifdef BOOTP_DEBUG 226 if (debug) 227 printf("subnet mask (%s) bad\n", intoa(smask)); 228 #endif 229 smask = 0; 230 } 231 232 /* Get subnet (or natural net) mask */ 233 mask = nmask; 234 if (smask) 235 mask = smask; 236 #ifdef BOOTP_DEBUG 237 if (debug) 238 printf("mask: %s\n", intoa(mask)); 239 #endif 240 241 /* We need a gateway if root or swap is on a different net */ 242 if (!SAMENET(d->myip, rootip, mask)) { 243 #ifdef BOOTP_DEBUG 244 if (debug) 245 printf("need gateway for root ip\n"); 246 #endif 247 } 248 249 if (!SAMENET(d->myip, swapip, mask)) { 250 #ifdef BOOTP_DEBUG 251 if (debug) 252 printf("need gateway for swap ip\n"); 253 #endif 254 } 255 256 /* Toss gateway if on a different net */ 257 if (!SAMENET(d->myip, gateip, mask)) { 258 #ifdef BOOTP_DEBUG 259 if (debug) 260 printf("gateway ip (%s) bad\n", intoa(gateip)); 261 #endif 262 gateip = 0; 263 } 264 265 return (0); 266 267 bad: 268 errno = 0; 269 return (-1); 270 } 271 272 static void 273 vend_cmu(cp) 274 u_char *cp; 275 { 276 register struct cmu_vend *vp; 277 278 #ifdef BOOTP_DEBUG 279 if (debug) 280 printf("vend_cmu bootp info.\n"); 281 #endif 282 vp = (struct cmu_vend *)cp; 283 284 if (vp->v_smask.s_addr != 0) { 285 smask = ntohl(vp->v_smask.s_addr); 286 } 287 if (vp->v_dgate.s_addr != 0) { 288 gateip = ntohl(vp->v_dgate.s_addr); 289 } 290 } 291 292 static void 293 vend_rfc1048(cp, len) 294 register u_char *cp; 295 u_int len; 296 { 297 register u_char *ep; 298 register int size; 299 register u_char tag; 300 301 #ifdef BOOTP_DEBUG 302 if (debug) 303 printf("vend_rfc1048 bootp info. len=%d\n", len); 304 #endif 305 ep = cp + len; 306 307 /* Step over magic cookie */ 308 cp += sizeof(long); 309 310 while (cp < ep) { 311 tag = *cp++; 312 size = *cp++; 313 if (tag == TAG_END) 314 break; 315 316 if (tag == TAG_SUBNET_MASK) { 317 bcopy(cp, &smask, sizeof(smask)); 318 smask = ntohl(smask); 319 } 320 if (tag == TAG_GATEWAY) { 321 bcopy(cp, &gateip, sizeof(gateip)); 322 gateip = ntohl(gateip); 323 } 324 if (tag == TAG_SWAPSERVER) { 325 bcopy(cp, &swapip, sizeof(swapip)); 326 swapip = ntohl(swapip); 327 } 328 if (tag == TAG_DOMAIN_SERVER) { 329 bcopy(cp, &nameip, sizeof(nameip)); 330 nameip = ntohl(nameip); 331 } 332 if (tag == TAG_ROOTPATH) { 333 strncpy(rootpath, cp, sizeof(rootpath)); 334 rootpath[size] = '\0'; 335 } 336 if (tag == TAG_HOSTNAME) { 337 strncpy(hostname, cp, sizeof(hostname)); 338 hostname[size] = '\0'; 339 } 340 if (tag == TAG_DOMAINNAME) { 341 strncpy(domainname, cp, sizeof(domainname)); 342 domainname[size] = '\0'; 343 } 344 cp += size; 345 } 346 } 347
Indexes created Tue Sep 30 11:09:46 GMT 2025