237 lines
6.6 KiB
C
237 lines
6.6 KiB
C
/*
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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: /cvsroot/src/sys/lib/libnetboot/Attic/bootp.c,v 1.1 1993/10/13 05:41:26 cgd Exp $ (LBL)
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*/
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#include <sys/param.h>
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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 <errno.h>
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#include "netboot.h"
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#include "bootbootp.h"
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#include "bootp.h"
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/* Machinery used to insure we don't stop until we have everything we need */
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#define BOOT_MYIP 0x01
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#define BOOT_ROOT 0x02
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#define BOOT_SWAP 0x04
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#define BOOT_GATEIP 0x08 /* optional */
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#define BOOT_SMASK 0x10 /* optional */
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#define BOOT_UCRED 0x20 /* not implemented */
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static int have;
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static int need = BOOT_MYIP | BOOT_ROOT | BOOT_SWAP;
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/* Local forwards */
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static int bootpsend __P((struct iodesc *, void *, int));
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static int bootprecv __P((struct iodesc*, void *, int));
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/* Fetch required bootp infomation */
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void
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bootp(d)
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register struct iodesc *d;
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{
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register struct bootp *bp;
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register void *pkt;
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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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union {
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u_char buffer[RECV_SIZE];
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struct {
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u_char header[HEADER_SIZE];
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struct bootp xrbootp;
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}xrbuf;
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#define rbootp xrbuf.xrbootp
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} rbuf;
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if (debug)
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printf("bootp: called\n");
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have = 0;
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bp = &wbuf.wbootp;
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pkt = &rbuf.rbootp;
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pkt = (((char *) pkt) - HEADER_SIZE);
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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->myport = IPPORT_BOOTPC;
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d->destport = IPPORT_BOOTPS;
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d->destip = INADDR_BROADCAST;
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while ((have & need) != need) {
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if (debug)
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printf("bootp: sendrecv\n");
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(void)sendrecv(d, bootpsend, bp, sizeof(*bp),
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bootprecv, pkt, RECV_SIZE);
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}
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}
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/* Transmit a bootp request */
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static int
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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 int len;
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{
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register struct bootp *bp;
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if (debug)
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printf("bootpsend: called\n");
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bp = pkt;
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bzero(bp->bp_file, sizeof(bp->bp_file));
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if ((have & BOOT_ROOT) == 0)
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strcpy((char *)bp->bp_file, "root");
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else if ((have & BOOT_SWAP) == 0)
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strcpy((char *)bp->bp_file, "swap");
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bp->bp_xid = d->xid;
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bp->bp_secs = (u_long)(getsecs() - bot);
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if (debug)
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printf("bootpsend: calling sendudp\n");
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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 int
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bootprecv(d, pkt, len)
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register struct iodesc *d;
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register void *pkt;
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int len;
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{
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register struct bootp *bp;
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register struct cmu_vend *vp;
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if (debug)
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printf("bootprecv: called\n");
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bp = (struct bootp *)checkudp(d, pkt, &len);
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if (bp == NULL || len < sizeof(*bp)) {
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errno = 0;
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return (-1);
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}
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if (bp->bp_xid != d->xid) {
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errno = 0;
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return (-1);
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}
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vp = (struct cmu_vend *)bp->bp_vend;
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if (bcmp(VM_CMU, vp->v_magic, sizeof(vp->v_magic)) != 0) {
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printf("bootprecv: not cmu magic\n");
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vp = NULL;
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}
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/* Suck out all we can */
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if (bp->bp_yiaddr.s_addr != 0 && (have & BOOT_MYIP) == 0) {
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have |= BOOT_MYIP;
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d->myip = bp->bp_yiaddr.s_addr;
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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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}
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if (vp && vp->v_smask.s_addr != 0 && (have & BOOT_SMASK) == 0) {
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have |= BOOT_SMASK;
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smask = vp->v_smask.s_addr;
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}
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if (vp && vp->v_dgate.s_addr != 0 && (have & BOOT_GATEIP) == 0) {
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have |= BOOT_GATEIP;
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gateip = vp->v_dgate.s_addr;
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}
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if (bp->bp_giaddr.s_addr != 0 && bp->bp_file[0] != '\0') {
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if ((have & BOOT_ROOT) == 0) {
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have |= BOOT_ROOT;
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rootip = bp->bp_giaddr.s_addr;
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strncpy(rootpath, (char *)bp->bp_file,
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sizeof(rootpath));
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rootpath[sizeof(rootpath) - 1] = '\0';
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/* Bump xid so next request will be unique */
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++d->xid;
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} else if ((have & BOOT_SWAP) == 0) {
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have |= BOOT_SWAP;
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swapip = bp->bp_giaddr.s_addr;
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strncpy(swappath, (char *)bp->bp_file,
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sizeof(swappath));
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swappath[sizeof(swappath) - 1] = '\0';
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/* Bump xid so next request will be unique */
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++d->xid;
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}
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}
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/* Done if we don't know our ip address yet */
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if ((have & BOOT_MYIP) == 0) {
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errno = 0;
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return (-1);
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}
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/* Check subnet mask against net mask; toss if bogus */
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if ((have & BOOT_SMASK) != 0 && (nmask & smask) != nmask) {
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smask = 0;
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have &= ~BOOT_SMASK;
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}
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/* Get subnet (or net) mask */
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mask = nmask;
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if ((have & BOOT_SMASK) != 0)
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mask = smask;
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/* We need a gateway if root or swap is on a different net */
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if ((have & BOOT_ROOT) != 0 && !SAMENET(d->myip, rootip, mask))
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need |= BOOT_GATEIP;
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if ((have & BOOT_SWAP) != 0 && !SAMENET(d->myip, swapip, mask))
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need |= BOOT_GATEIP;
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/* Toss gateway if on a different net */
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if ((have & BOOT_GATEIP) != 0 && !SAMENET(d->myip, gateip, mask)) {
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gateip = 0;
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have &= ~BOOT_GATEIP;
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}
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return (0);
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}
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