/* $NetBSD: bootp.c,v 1.2 1994/10/26 05:44:38 cgd 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 int bootpsend __P((struct iodesc *, void *, int)); static int bootprecv __P((struct iodesc*, void *, int)); static void vend_cmu __P((u_char *)); static void vend_rfc1048 __P((u_char *, u_int)); /* Fetch required bootp infomation */ void bootp(sock) int sock; { struct iodesc *d; register struct bootp *bp; register void *pkt; struct { u_char header[HEADER_SIZE]; struct bootp wbootp; } wbuf; union { u_char buffer[RECV_SIZE]; struct { u_char header[HEADER_SIZE]; struct bootp xrbootp; }xrbuf; #define rbootp xrbuf.xrbootp } 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; pkt = &rbuf.rbootp; pkt -= HEADER_SIZE; bzero(bp, sizeof(*bp)); bp->bp_op = BOOTREQUEST; bp->bp_htype = 1; /* 10Mb Ethernet (48 bits) */ bp->bp_hlen = 6; MACPY(d->myea, bp->bp_chaddr); d->xid = 0; d->myip = myip; d->myport = IPPORT_BOOTPC; d->destip = INADDR_BROADCAST; d->destport = IPPORT_BOOTPS; (void)sendrecv(d, bootpsend, bp, sizeof(*bp), bootprecv, pkt, RECV_SIZE); } /* Transmit a bootp request */ static int bootpsend(d, pkt, len) register struct iodesc *d; register void *pkt; register int len; { register struct bootp *bp; #ifdef BOOTP_DEBUG if (debug) printf("bootpsend: d=%x called.\n", (u_int)d); #endif bp = pkt; bzero(bp->bp_file, sizeof(bp->bp_file)); bcopy(vm_rfc1048, bp->bp_vend, sizeof(long)); bp->bp_xid = d->xid; bp->bp_secs = (u_long)(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 int bootprecv(d, pkt, len) register struct iodesc *d; register void *pkt; int len; { register struct bootp *bp; #ifdef BOOTP_DEBUG if (debug) printf("bootprecv: called\n"); #endif bp = (struct bootp *)checkudp(d, pkt, &len); #ifdef BOOTP_DEBUG if (debug) printf("bootprecv: checked. bp = 0x%x, len = %d\n", (unsigned)bp, len); #endif if (bp == NULL || len < sizeof(*bp) || bp->bp_xid != d->xid) { #ifdef BOOTP_DEBUG if (debug) { printf("bootprecv: not for us.\n"); if (bp == NULL) printf("bootprecv: bp null\n"); else { if (len < sizeof(*bp)) printf("bootprecv: expected %d bytes, got %d\n", sizeof(*bp), len); if (bp->bp_xid != d->xid) printf("bootprecv: expected xid 0x%x, got 0x%x\n", d->xid, bp->bp_xid); } } #endif errno = 0; return (-1); } /* Bump xid so next request will be unique */ ++d->xid; #ifdef BOOTP_DEBUG if (debug) printf("bootprecv: got one!\n"); #endif /* Pick up our ip address (and natural netmask) */ myip = d->myip = ntohl(bp->bp_yiaddr.s_addr); #ifdef BOOTP_DEBUG if (debug) printf("our ip address is %s\n", intoa(d->myip)); #endif if (IN_CLASSA(d->myip)) nmask = IN_CLASSA_NET; else if (IN_CLASSB(d->myip)) 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 = ntohl(bp->bp_siaddr.s_addr); } 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%x\n", (int)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 */ mask = nmask; if (smask) mask = smask; #ifdef BOOTP_DEBUG if (debug) printf("mask: %s\n", intoa(mask)); #endif /* We need a gateway if root or swap is on a different net */ if (!SAMENET(d->myip, rootip, mask)) { #ifdef BOOTP_DEBUG if (debug) printf("need gateway for root ip\n"); #endif } if (!SAMENET(d->myip, swapip, mask)) { #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, mask)) { #ifdef BOOTP_DEBUG if (debug) printf("gateway ip (%s) bad\n", intoa(gateip)); #endif gateip = 0; } return (0); } static void vend_cmu(cp) u_char *cp; { register 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 = ntohl(vp->v_smask.s_addr); } if (vp->v_dgate.s_addr != 0) { gateip = ntohl(vp->v_dgate.s_addr); } } static void vend_rfc1048(cp, len) register u_char *cp; u_int len; { register u_char *ep; register int size; register 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(long); while (cp < ep) { tag = *cp++; size = *cp++; if (tag == TAG_END) break; if (tag == TAG_SUBNET_MASK) { bcopy(cp, &smask, sizeof(smask)); smask = ntohl(smask); } if (tag == TAG_GATEWAY) { bcopy(cp, &gateip, sizeof(gateip)); gateip = ntohl(gateip); } if (tag == TAG_SWAPSERVER) { bcopy(cp, &swapip, sizeof(swapip)); swapip = ntohl(swapip); } if (tag == TAG_DOMAIN_SERVER) { bcopy(cp, &nameip, sizeof(nameip)); nameip = ntohl(nameip); } if (tag == TAG_ROOTPATH) { strncpy(rootpath, cp, sizeof(rootpath)); rootpath[size] = '\0'; } if (tag == TAG_HOSTNAME) { strncpy(hostname, cp, sizeof(hostname)); hostname[size] = '\0'; } if (tag == TAG_DOMAINNAME) { strncpy(domainname, cp, sizeof(domainname)); domainname[size] = '\0'; } cp += size; } }