Annotation of sys/lib/libsa/bootp.c, Revision 1.1
1.1 ! nbrk 1: /* $OpenBSD: bootp.c,v 1.12 2006/02/06 17:37:28 jmc Exp $ */
! 2: /* $NetBSD: bootp.c,v 1.10 1996/10/13 02:28:59 christos Exp $ */
! 3:
! 4: /*
! 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: * @(#) Header: bootp.c,v 1.4 93/09/11 03:13:51 leres Exp (LBL)
! 41: */
! 42:
! 43: #include <sys/types.h>
! 44: #include <sys/socket.h>
! 45: #include <netinet/in.h>
! 46: #include <netinet/in_systm.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 ssize_t bootpsend(struct iodesc *, void *, size_t);
! 62: static ssize_t bootprecv(struct iodesc *, void *, size_t, time_t);
! 63: static void vend_cmu(u_char *);
! 64: static void vend_rfc1048(u_char *, u_int);
! 65:
! 66: /* Fetch required bootp information */
! 67: void
! 68: bootp(int sock)
! 69: {
! 70: struct iodesc *d;
! 71: struct bootp *bp;
! 72: struct {
! 73: u_char header[HEADER_SIZE];
! 74: struct bootp wbootp;
! 75: } wbuf;
! 76: struct {
! 77: u_char header[HEADER_SIZE];
! 78: struct bootp rbootp;
! 79: } rbuf;
! 80:
! 81: #ifdef BOOTP_DEBUG
! 82: if (debug)
! 83: printf("bootp: socket=%d\n", sock);
! 84: #endif
! 85: if (!bot)
! 86: bot = getsecs();
! 87:
! 88: if (!(d = socktodesc(sock))) {
! 89: printf("bootp: bad socket. %d\n", sock);
! 90: return;
! 91: }
! 92: #ifdef BOOTP_DEBUG
! 93: if (debug)
! 94: printf("bootp: d=%x\n", (u_int)d);
! 95: #endif
! 96:
! 97: bp = &wbuf.wbootp;
! 98: bzero(bp, sizeof(*bp));
! 99:
! 100: bp->bp_op = BOOTREQUEST;
! 101: bp->bp_htype = HTYPE_ETHERNET; /* 10Mb Ethernet (48 bits) */
! 102: bp->bp_hlen = 6;
! 103: bp->bp_xid = htonl(d->xid);
! 104: MACPY(d->myea, bp->bp_chaddr);
! 105: bzero(bp->bp_file, sizeof(bp->bp_file));
! 106: bcopy(vm_rfc1048, bp->bp_vend, sizeof(vm_rfc1048));
! 107:
! 108: d->myip = myip;
! 109: d->myport = htons(IPPORT_BOOTPC);
! 110: d->destip.s_addr = INADDR_BROADCAST;
! 111: d->destport = htons(IPPORT_BOOTPS);
! 112:
! 113: (void)sendrecv(d,
! 114: bootpsend, bp, sizeof(*bp),
! 115: bootprecv, &rbuf.rbootp, sizeof(rbuf.rbootp));
! 116:
! 117: /* Bump xid so next request will be unique. */
! 118: ++d->xid;
! 119: }
! 120:
! 121: /* Transmit a bootp request */
! 122: static ssize_t
! 123: bootpsend(struct iodesc *d, void *pkt, size_t len)
! 124: {
! 125: struct bootp *bp;
! 126:
! 127: #ifdef BOOTP_DEBUG
! 128: if (debug)
! 129: printf("bootpsend: d=%x called.\n", (u_int)d);
! 130: #endif
! 131:
! 132: bp = pkt;
! 133: bp->bp_secs = htons((u_short)(getsecs() - bot));
! 134:
! 135: #ifdef BOOTP_DEBUG
! 136: if (debug)
! 137: printf("bootpsend: calling sendudp\n");
! 138: #endif
! 139:
! 140: return (sendudp(d, pkt, len));
! 141: }
! 142:
! 143: /* Returns 0 if this is the packet we're waiting for else -1 (and errno == 0) */
! 144: static ssize_t
! 145: bootprecv(struct iodesc *d, void *pkt, size_t len, time_t tleft)
! 146: {
! 147: ssize_t n;
! 148: struct bootp *bp;
! 149:
! 150: #ifdef BOOTP_DEBUG
! 151: if (debug)
! 152: printf("bootprecv: called\n");
! 153: #endif
! 154:
! 155: n = readudp(d, pkt, len, tleft);
! 156: if (n < 0 || (size_t)n < sizeof(struct bootp))
! 157: goto bad;
! 158:
! 159: bp = (struct bootp *)pkt;
! 160:
! 161: #ifdef BOOTP_DEBUG
! 162: if (debug)
! 163: printf("bootprecv: checked. bp = 0x%x, n = %d\n",
! 164: (unsigned)bp, n);
! 165: #endif
! 166: if (bp->bp_xid != htonl(d->xid)) {
! 167: #ifdef BOOTP_DEBUG
! 168: if (debug) {
! 169: printf("bootprecv: expected xid 0x%lx, got 0x%lx\n",
! 170: d->xid, ntohl(bp->bp_xid));
! 171: }
! 172: #endif
! 173: goto bad;
! 174: }
! 175:
! 176: #ifdef BOOTP_DEBUG
! 177: if (debug)
! 178: printf("bootprecv: got one!\n");
! 179: #endif
! 180:
! 181: /* Pick up our ip address (and natural netmask) */
! 182: myip = d->myip = bp->bp_yiaddr;
! 183: #ifdef BOOTP_DEBUG
! 184: if (debug)
! 185: printf("our ip address is %s\n", inet_ntoa(d->myip));
! 186: #endif
! 187: if (IN_CLASSA(d->myip.s_addr))
! 188: nmask = IN_CLASSA_NET;
! 189: else if (IN_CLASSB(d->myip.s_addr))
! 190: nmask = IN_CLASSB_NET;
! 191: else
! 192: nmask = IN_CLASSC_NET;
! 193: #ifdef BOOTP_DEBUG
! 194: if (debug)
! 195: printf("'native netmask' is %s\n", intoa(nmask));
! 196: #endif
! 197:
! 198: /* Pick up root or swap server address and file spec. */
! 199: if (bp->bp_siaddr.s_addr != 0)
! 200: rootip = bp->bp_siaddr;
! 201: if (bp->bp_file[0] != '\0') {
! 202: strncpy(bootfile, (char *)bp->bp_file, sizeof(bootfile));
! 203: bootfile[sizeof(bootfile) - 1] = '\0';
! 204: }
! 205:
! 206: /* Suck out vendor info */
! 207: if (bcmp(vm_cmu, bp->bp_vend, sizeof(vm_cmu)) == 0)
! 208: vend_cmu(bp->bp_vend);
! 209: else if (bcmp(vm_rfc1048, bp->bp_vend, sizeof(vm_rfc1048)) == 0)
! 210: vend_rfc1048(bp->bp_vend, sizeof(bp->bp_vend));
! 211: else
! 212: printf("bootprecv: unknown vendor 0x%lx\n", (long)bp->bp_vend);
! 213:
! 214: /* Check subnet mask against net mask; toss if bogus */
! 215: if ((nmask & smask) != nmask) {
! 216: #ifdef BOOTP_DEBUG
! 217: if (debug)
! 218: printf("subnet mask (%s) bad\n", intoa(smask));
! 219: #endif
! 220: smask = 0;
! 221: }
! 222:
! 223: /* Get subnet (or natural net) mask */
! 224: netmask = nmask;
! 225: if (smask)
! 226: netmask = smask;
! 227: #ifdef BOOTP_DEBUG
! 228: if (debug)
! 229: printf("mask: %s\n", intoa(netmask));
! 230: #endif
! 231:
! 232: /* We need a gateway if root or swap is on a different net */
! 233: if (!SAMENET(d->myip, rootip, netmask)) {
! 234: #ifdef BOOTP_DEBUG
! 235: if (debug)
! 236: printf("need gateway for root ip\n");
! 237: #endif
! 238: }
! 239:
! 240: if (!SAMENET(d->myip, swapip, netmask)) {
! 241: #ifdef BOOTP_DEBUG
! 242: if (debug)
! 243: printf("need gateway for swap ip\n");
! 244: #endif
! 245: }
! 246:
! 247: /* Toss gateway if on a different net */
! 248: if (!SAMENET(d->myip, gateip, netmask)) {
! 249: #ifdef BOOTP_DEBUG
! 250: if (debug)
! 251: printf("gateway ip (%s) bad\n", inet_ntoa(gateip));
! 252: #endif
! 253: gateip.s_addr = 0;
! 254: }
! 255:
! 256: return (n);
! 257:
! 258: bad:
! 259: errno = 0;
! 260: return (-1);
! 261: }
! 262:
! 263: static void
! 264: vend_cmu(u_char *cp)
! 265: {
! 266: struct cmu_vend *vp;
! 267:
! 268: #ifdef BOOTP_DEBUG
! 269: if (debug)
! 270: printf("vend_cmu bootp info.\n");
! 271: #endif
! 272: vp = (struct cmu_vend *)cp;
! 273:
! 274: if (vp->v_smask.s_addr != 0)
! 275: smask = vp->v_smask.s_addr;
! 276: if (vp->v_dgate.s_addr != 0)
! 277: gateip = vp->v_dgate;
! 278: }
! 279:
! 280: static void
! 281: vend_rfc1048(u_char *cp, u_int len)
! 282: {
! 283: u_char *ep;
! 284: int size;
! 285: u_char tag;
! 286:
! 287: #ifdef BOOTP_DEBUG
! 288: if (debug)
! 289: printf("vend_rfc1048 bootp info. len=%d\n", len);
! 290: #endif
! 291: ep = cp + len;
! 292:
! 293: /* Step over magic cookie */
! 294: cp += sizeof(int);
! 295:
! 296: while (cp < ep) {
! 297: tag = *cp++;
! 298: size = *cp++;
! 299: if (tag == TAG_END)
! 300: break;
! 301:
! 302: if (tag == TAG_SUBNET_MASK)
! 303: bcopy(cp, &smask, sizeof(smask));
! 304: if (tag == TAG_GATEWAY)
! 305: bcopy(cp, &gateip.s_addr, sizeof(gateip.s_addr));
! 306: if (tag == TAG_SWAPSERVER)
! 307: bcopy(cp, &swapip.s_addr, sizeof(swapip.s_addr));
! 308: if (tag == TAG_DOMAIN_SERVER)
! 309: bcopy(cp, &nameip.s_addr, sizeof(nameip.s_addr));
! 310: if (tag == TAG_ROOTPATH) {
! 311: strncpy(rootpath, (char *)cp, sizeof(rootpath));
! 312: rootpath[size] = '\0';
! 313: }
! 314: if (tag == TAG_HOSTNAME) {
! 315: strncpy(hostname, (char *)cp, sizeof(hostname));
! 316: hostname[size] = '\0';
! 317: }
! 318: if (tag == TAG_DOMAINNAME) {
! 319: strncpy(domainname, (char *)cp, sizeof(domainname));
! 320: domainname[size] = '\0';
! 321: }
! 322: cp += size;
! 323: }
! 324: }
CVSweb
![[BACK]](/icons/back.gif){kind=icon}
Return to bootp.c CVS log ![[TXT]](/icons/text.gif){kind=icon}
![[DIR]](/icons/dir.gif){kind=icon}
Up to [local] / sys / lib / libsa