347 lines
8.2 KiB
C
347 lines
8.2 KiB
C
/* $NetBSD: bootp.c,v 1.3 1995/02/20 11:04:04 mycroft Exp $ */
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/*
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* Copyright (c) 1992 Regents of the University of California.
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* All rights reserved.
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*
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* This software was developed by the Computer Systems Engineering group
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* at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and
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* contributed to Berkeley.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Lawrence Berkeley Laboratory and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @(#) Header: bootp.c,v 1.4 93/09/11 03:13:51 leres Exp (LBL)
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*/
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#include <sys/types.h>
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#include <netinet/in.h>
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#include <netinet/in_systm.h>
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#include <string.h>
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#include "stand.h"
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#include "net.h"
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#include "netif.h"
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#include "bootp.h"
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static n_long nmask, smask;
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static time_t bot;
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static char vm_rfc1048[4] = VM_RFC1048;
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static char vm_cmu[4] = VM_CMU;
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/* Local forwards */
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static size_t bootpsend __P((struct iodesc *, void *, size_t));
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static size_t bootprecv __P((struct iodesc *, void *, size_t, time_t));
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static void vend_cmu __P((u_char *));
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static void vend_rfc1048 __P((u_char *, u_int));
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/* Fetch required bootp infomation */
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void
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bootp(sock)
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int sock;
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{
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struct iodesc *d;
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register struct bootp *bp;
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struct {
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u_char header[HEADER_SIZE];
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struct bootp wbootp;
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} wbuf;
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struct {
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u_char header[HEADER_SIZE];
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struct bootp rbootp;
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} rbuf;
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#ifdef BOOTP_DEBUG
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if (debug)
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printf("bootp: socket=%d\n", sock);
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#endif
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if (!bot)
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bot = getsecs();
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if (!(d = socktodesc(sock))) {
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printf("bootp: bad socket. %d\n", sock);
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return;
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}
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#ifdef BOOTP_DEBUG
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if (debug)
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printf("bootp: d=%x\n", (u_int)d);
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#endif
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bp = &wbuf.wbootp;
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bzero(bp, sizeof(*bp));
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bp->bp_op = BOOTREQUEST;
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bp->bp_htype = 1; /* 10Mb Ethernet (48 bits) */
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bp->bp_hlen = 6;
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MACPY(d->myea, bp->bp_chaddr);
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d->xid = 0;
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d->myip = myip;
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d->myport = IPPORT_BOOTPC;
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d->destip = INADDR_BROADCAST;
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d->destport = IPPORT_BOOTPS;
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(void)sendrecv(d,
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bootpsend, bp, sizeof(*bp),
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bootprecv, &rbuf.rbootp, sizeof(rbuf.rbootp));
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}
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/* Transmit a bootp request */
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static size_t
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bootpsend(d, pkt, len)
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register struct iodesc *d;
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register void *pkt;
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register size_t len;
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{
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register struct bootp *bp;
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#ifdef BOOTP_DEBUG
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if (debug)
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printf("bootpsend: d=%x called.\n", (u_int)d);
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#endif
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bp = pkt;
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bzero(bp->bp_file, sizeof(bp->bp_file));
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bcopy(vm_rfc1048, bp->bp_vend, sizeof(long));
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bp->bp_xid = d->xid;
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bp->bp_secs = (u_long)(getsecs() - bot);
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#ifdef BOOTP_DEBUG
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if (debug)
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printf("bootpsend: calling sendudp\n");
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#endif
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return (sendudp(d, pkt, len));
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}
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/* Returns 0 if this is the packet we're waiting for else -1 (and errno == 0) */
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static size_t
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bootprecv(d, pkt, len, tleft)
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register struct iodesc *d;
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register void *pkt;
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register size_t len;
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time_t tleft;
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{
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register struct bootp *bp;
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#ifdef BOOTP_DEBUG
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if (debug)
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printf("bootprecv: called\n");
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#endif
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len = readudp(d, pkt, len, tleft);
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if (len == -1 || len < sizeof(struct bootp))
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goto bad;
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bp = (struct bootp *)pkt;
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NTOHL(bp->bp_xid);
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#ifdef BOOTP_DEBUG
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if (debug)
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printf("bootprecv: checked. bp = 0x%x, len = %d\n",
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(unsigned)bp, len);
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#endif
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if (bp->bp_xid != d->xid) {
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#ifdef BOOTP_DEBUG
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if (debug) {
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printf("bootprecv: expected xid 0x%x, got 0x%x\n",
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d->xid, bp->bp_xid);
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}
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#endif
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goto bad;
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}
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/* Bump xid so next request will be unique. */
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++d->xid;
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#ifdef BOOTP_DEBUG
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if (debug)
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printf("bootprecv: got one!\n");
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#endif
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/* Pick up our ip address (and natural netmask) */
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myip = d->myip = ntohl(bp->bp_yiaddr.s_addr);
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#ifdef BOOTP_DEBUG
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if (debug)
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printf("our ip address is %s\n", intoa(d->myip));
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#endif
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if (IN_CLASSA(d->myip))
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nmask = IN_CLASSA_NET;
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else if (IN_CLASSB(d->myip))
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nmask = IN_CLASSB_NET;
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else
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nmask = IN_CLASSC_NET;
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#ifdef BOOTP_DEBUG
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if (debug)
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printf("'native netmask' is %s\n", intoa(nmask));
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#endif
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/* Pick up root or swap server address and file spec. */
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if (bp->bp_siaddr.s_addr != 0)
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rootip = ntohl(bp->bp_siaddr.s_addr);
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if (bp->bp_file[0] != '\0') {
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strncpy(bootfile, (char *)bp->bp_file, sizeof(bootfile));
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bootfile[sizeof(bootfile) - 1] = '\0';
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}
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/* Suck out vendor info */
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if (bcmp(vm_cmu, bp->bp_vend, sizeof(vm_cmu)) == 0)
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vend_cmu(bp->bp_vend);
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else if (bcmp(vm_rfc1048, bp->bp_vend, sizeof(vm_rfc1048)) == 0)
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vend_rfc1048(bp->bp_vend, sizeof(bp->bp_vend));
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else
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printf("bootprecv: unknown vendor 0x%x\n", (int)bp->bp_vend);
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/* Check subnet mask against net mask; toss if bogus */
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if ((nmask & smask) != nmask) {
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#ifdef BOOTP_DEBUG
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if (debug)
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printf("subnet mask (%s) bad\n", intoa(smask));
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#endif
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smask = 0;
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}
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/* Get subnet (or natural net) mask */
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mask = nmask;
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if (smask)
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mask = smask;
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#ifdef BOOTP_DEBUG
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if (debug)
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printf("mask: %s\n", intoa(mask));
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#endif
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/* We need a gateway if root or swap is on a different net */
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if (!SAMENET(d->myip, rootip, mask)) {
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#ifdef BOOTP_DEBUG
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if (debug)
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printf("need gateway for root ip\n");
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#endif
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}
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if (!SAMENET(d->myip, swapip, mask)) {
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#ifdef BOOTP_DEBUG
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if (debug)
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printf("need gateway for swap ip\n");
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#endif
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}
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/* Toss gateway if on a different net */
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if (!SAMENET(d->myip, gateip, mask)) {
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#ifdef BOOTP_DEBUG
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if (debug)
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printf("gateway ip (%s) bad\n", intoa(gateip));
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#endif
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gateip = 0;
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}
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return (0);
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bad:
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errno = 0;
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return (-1);
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}
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static void
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vend_cmu(cp)
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u_char *cp;
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{
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register struct cmu_vend *vp;
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#ifdef BOOTP_DEBUG
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if (debug)
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printf("vend_cmu bootp info.\n");
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#endif
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vp = (struct cmu_vend *)cp;
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if (vp->v_smask.s_addr != 0) {
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smask = ntohl(vp->v_smask.s_addr);
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}
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if (vp->v_dgate.s_addr != 0) {
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gateip = ntohl(vp->v_dgate.s_addr);
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}
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}
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static void
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vend_rfc1048(cp, len)
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register u_char *cp;
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u_int len;
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{
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register u_char *ep;
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register int size;
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register u_char tag;
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#ifdef BOOTP_DEBUG
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if (debug)
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printf("vend_rfc1048 bootp info. len=%d\n", len);
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#endif
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ep = cp + len;
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/* Step over magic cookie */
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cp += sizeof(long);
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while (cp < ep) {
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tag = *cp++;
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size = *cp++;
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if (tag == TAG_END)
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break;
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if (tag == TAG_SUBNET_MASK) {
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bcopy(cp, &smask, sizeof(smask));
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smask = ntohl(smask);
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}
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if (tag == TAG_GATEWAY) {
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bcopy(cp, &gateip, sizeof(gateip));
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gateip = ntohl(gateip);
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}
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if (tag == TAG_SWAPSERVER) {
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bcopy(cp, &swapip, sizeof(swapip));
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swapip = ntohl(swapip);
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}
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if (tag == TAG_DOMAIN_SERVER) {
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bcopy(cp, &nameip, sizeof(nameip));
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nameip = ntohl(nameip);
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}
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if (tag == TAG_ROOTPATH) {
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strncpy(rootpath, cp, sizeof(rootpath));
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rootpath[size] = '\0';
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}
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if (tag == TAG_HOSTNAME) {
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strncpy(hostname, cp, sizeof(hostname));
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hostname[size] = '\0';
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}
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if (tag == TAG_DOMAINNAME) {
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strncpy(domainname, cp, sizeof(domainname));
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domainname[size] = '\0';
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}
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cp += size;
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}
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}
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