/* $OpenBSD: bootp.c,v 1.12 2006/02/06 17:37:28 jmc Exp $ */ /* $NetBSD: bootp.c,v 1.10 1996/10/13 02:28:59 christos Exp $ */ /* * Copyright (c) 1992 Regents of the University of California. * All rights reserved. * * This software was developed by the Computer Systems Engineering group * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and * contributed to Berkeley. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. All advertising materials mentioning features or use of this software * must display the following acknowledgement: * This product includes software developed by the University of * California, Lawrence Berkeley Laboratory and its contributors. * 4. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * * @(#) Header: bootp.c,v 1.4 93/09/11 03:13:51 leres Exp (LBL) */ #include #include #include #include #include "stand.h" #include "net.h" #include "netif.h" #include "bootp.h" static n_long nmask, smask; static time_t bot; static char vm_rfc1048[4] = VM_RFC1048; static char vm_cmu[4] = VM_CMU; /* Local forwards */ static ssize_t bootpsend(struct iodesc *, void *, size_t); static ssize_t bootprecv(struct iodesc *, void *, size_t, time_t); static void vend_cmu(u_char *); static void vend_rfc1048(u_char *, u_int); /* Fetch required bootp information */ void bootp(int sock) { struct iodesc *d; struct bootp *bp; struct { u_char header[HEADER_SIZE]; struct bootp wbootp; } wbuf; struct { u_char header[HEADER_SIZE]; struct bootp rbootp; } rbuf; #ifdef BOOTP_DEBUG if (debug) printf("bootp: socket=%d\n", sock); #endif if (!bot) bot = getsecs(); if (!(d = socktodesc(sock))) { printf("bootp: bad socket. %d\n", sock); return; } #ifdef BOOTP_DEBUG if (debug) printf("bootp: d=%x\n", (u_int)d); #endif bp = &wbuf.wbootp; bzero(bp, sizeof(*bp)); bp->bp_op = BOOTREQUEST; bp->bp_htype = HTYPE_ETHERNET; /* 10Mb Ethernet (48 bits) */ bp->bp_hlen = 6; bp->bp_xid = htonl(d->xid); MACPY(d->myea, bp->bp_chaddr); bzero(bp->bp_file, sizeof(bp->bp_file)); bcopy(vm_rfc1048, bp->bp_vend, sizeof(vm_rfc1048)); d->myip = myip; d->myport = htons(IPPORT_BOOTPC); d->destip.s_addr = INADDR_BROADCAST; d->destport = htons(IPPORT_BOOTPS); (void)sendrecv(d, bootpsend, bp, sizeof(*bp), bootprecv, &rbuf.rbootp, sizeof(rbuf.rbootp)); /* Bump xid so next request will be unique. */ ++d->xid; } /* Transmit a bootp request */ static ssize_t bootpsend(struct iodesc *d, void *pkt, size_t len) { struct bootp *bp; #ifdef BOOTP_DEBUG if (debug) printf("bootpsend: d=%x called.\n", (u_int)d); #endif bp = pkt; bp->bp_secs = htons((u_short)(getsecs() - bot)); #ifdef BOOTP_DEBUG if (debug) printf("bootpsend: calling sendudp\n"); #endif return (sendudp(d, pkt, len)); } /* Returns 0 if this is the packet we're waiting for else -1 (and errno == 0) */ static ssize_t bootprecv(struct iodesc *d, void *pkt, size_t len, time_t tleft) { ssize_t n; struct bootp *bp; #ifdef BOOTP_DEBUG if (debug) printf("bootprecv: called\n"); #endif n = readudp(d, pkt, len, tleft); if (n < 0 || (size_t)n < sizeof(struct bootp)) goto bad; bp = (struct bootp *)pkt; #ifdef BOOTP_DEBUG if (debug) printf("bootprecv: checked. bp = 0x%x, n = %d\n", (unsigned)bp, n); #endif if (bp->bp_xid != htonl(d->xid)) { #ifdef BOOTP_DEBUG if (debug) { printf("bootprecv: expected xid 0x%lx, got 0x%lx\n", d->xid, ntohl(bp->bp_xid)); } #endif goto bad; } #ifdef BOOTP_DEBUG if (debug) printf("bootprecv: got one!\n"); #endif /* Pick up our ip address (and natural netmask) */ myip = d->myip = bp->bp_yiaddr; #ifdef BOOTP_DEBUG if (debug) printf("our ip address is %s\n", inet_ntoa(d->myip)); #endif if (IN_CLASSA(d->myip.s_addr)) nmask = IN_CLASSA_NET; else if (IN_CLASSB(d->myip.s_addr)) nmask = IN_CLASSB_NET; else nmask = IN_CLASSC_NET; #ifdef BOOTP_DEBUG if (debug) printf("'native netmask' is %s\n", intoa(nmask)); #endif /* Pick up root or swap server address and file spec. */ if (bp->bp_siaddr.s_addr != 0) rootip = bp->bp_siaddr; if (bp->bp_file[0] != '\0') { strncpy(bootfile, (char *)bp->bp_file, sizeof(bootfile)); bootfile[sizeof(bootfile) - 1] = '\0'; } /* Suck out vendor info */ if (bcmp(vm_cmu, bp->bp_vend, sizeof(vm_cmu)) == 0) vend_cmu(bp->bp_vend); else if (bcmp(vm_rfc1048, bp->bp_vend, sizeof(vm_rfc1048)) == 0) vend_rfc1048(bp->bp_vend, sizeof(bp->bp_vend)); else printf("bootprecv: unknown vendor 0x%lx\n", (long)bp->bp_vend); /* Check subnet mask against net mask; toss if bogus */ if ((nmask & smask) != nmask) { #ifdef BOOTP_DEBUG if (debug) printf("subnet mask (%s) bad\n", intoa(smask)); #endif smask = 0; } /* Get subnet (or natural net) mask */ netmask = nmask; if (smask) netmask = smask; #ifdef BOOTP_DEBUG if (debug) printf("mask: %s\n", intoa(netmask)); #endif /* We need a gateway if root or swap is on a different net */ if (!SAMENET(d->myip, rootip, netmask)) { #ifdef BOOTP_DEBUG if (debug) printf("need gateway for root ip\n"); #endif } if (!SAMENET(d->myip, swapip, netmask)) { #ifdef BOOTP_DEBUG if (debug) printf("need gateway for swap ip\n"); #endif } /* Toss gateway if on a different net */ if (!SAMENET(d->myip, gateip, netmask)) { #ifdef BOOTP_DEBUG if (debug) printf("gateway ip (%s) bad\n", inet_ntoa(gateip)); #endif gateip.s_addr = 0; } return (n); bad: errno = 0; return (-1); } static void vend_cmu(u_char *cp) { struct cmu_vend *vp; #ifdef BOOTP_DEBUG if (debug) printf("vend_cmu bootp info.\n"); #endif vp = (struct cmu_vend *)cp; if (vp->v_smask.s_addr != 0) smask = vp->v_smask.s_addr; if (vp->v_dgate.s_addr != 0) gateip = vp->v_dgate; } static void vend_rfc1048(u_char *cp, u_int len) { u_char *ep; int size; u_char tag; #ifdef BOOTP_DEBUG if (debug) printf("vend_rfc1048 bootp info. len=%d\n", len); #endif ep = cp + len; /* Step over magic cookie */ cp += sizeof(int); while (cp < ep) { tag = *cp++; size = *cp++; if (tag == TAG_END) break; if (tag == TAG_SUBNET_MASK) bcopy(cp, &smask, sizeof(smask)); if (tag == TAG_GATEWAY) bcopy(cp, &gateip.s_addr, sizeof(gateip.s_addr)); if (tag == TAG_SWAPSERVER) bcopy(cp, &swapip.s_addr, sizeof(swapip.s_addr)); if (tag == TAG_DOMAIN_SERVER) bcopy(cp, &nameip.s_addr, sizeof(nameip.s_addr)); if (tag == TAG_ROOTPATH) { strncpy(rootpath, (char *)cp, sizeof(rootpath)); rootpath[size] = '\0'; } if (tag == TAG_HOSTNAME) { strncpy(hostname, (char *)cp, sizeof(hostname)); hostname[size] = '\0'; } if (tag == TAG_DOMAINNAME) { strncpy(domainname, (char *)cp, sizeof(domainname)); domainname[size] = '\0'; } cp += size; } }