388 lines
9.7 KiB
C
388 lines
9.7 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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* from @(#) Header: bootp.c,v 1.4 93/09/11 03:13:51 leres Exp (LBL)
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* $Id: bootp.c,v 1.4 1993/10/18 23:01:13 cgd Exp $
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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 <errno.h>
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#include <string.h>
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#include "salibc.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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static char vm_zero[4];
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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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static nvend;
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static char *vend[] = {
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vm_zero, /* try no explicit vendor type first */
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vm_cmu,
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vm_rfc1048 /* try variable format last */
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};
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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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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(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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#ifdef DEBUG
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if (debug)
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printf("bootp: called\n");
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#endif
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bp = &wbuf.wbootp;
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pkt = &rbuf.rbootp;
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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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#ifdef DEBUG
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if (debug)
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printf("bootp: sendrecv\n");
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#endif
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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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#ifdef DEBUG
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if (debug)
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printf("bootpsend: called. we have 0x%x, and need 0x%x\n",
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have, need);
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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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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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bcopy(vend[nvend], bp->bp_vend, sizeof(long));
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/* If we need any vendor info, cycle to a different vendor next time */
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if ((need & ~have) & (BOOT_SMASK | BOOT_GATEIP))
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nvend = (nvend + 1) % (sizeof(vend) / sizeof(vend[0]));
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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 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 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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u_long ul;
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#ifdef DEBUG
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if (debug)
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printf("bootprecv: called\n");
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#endif
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bp = (struct bootp *)checkudp(d, pkt, &len);
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#ifdef 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 == NULL || len < sizeof(*bp) || bp->bp_xid != d->xid) {
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#ifdef DEBUG
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if (debug) {
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printf("bootprecv: not for us.\n");
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if (bp == NULL)
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printf("bootprecv: bp null\n");
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else {
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if (len < sizeof(*bp))
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printf("bootprecv: expected %d bytes, got %d\n",
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sizeof(*bp), len);
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if (bp->bp_xid != d->xid)
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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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delay(500);
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}
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#endif
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errno = 0;
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return (-1);
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}
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#ifdef DEBUG
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if (debug)
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printf("bootprecv: got one!\n");
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delay(500);
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#endif
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/* Pick up our ip address (and natural netmask) */
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if (ntohl(bp->bp_yiaddr.s_addr) != 0 && (have & BOOT_MYIP) == 0) {
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have |= BOOT_MYIP;
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d->myip = ntohl(bp->bp_yiaddr.s_addr);
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#ifdef 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 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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}
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/* Pick up root or swap server address and file spec */
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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 = ntohl(bp->bp_giaddr.s_addr);
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#ifdef DEBUG
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if (debug)
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printf("root ip address is %s\n", intoa(rootip));
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#endif
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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 = ntohl(bp->bp_giaddr.s_addr);
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#ifdef DEBUG
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if (debug)
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printf("swap ip address is %s\n", intoa(swapip));
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#endif
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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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/* 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 if (bcmp(vm_zero, bp->bp_vend, sizeof(vm_zero)) != 0) {
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bcopy(bp->bp_vend, &ul, sizeof(ul));
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printf("bootprecv: unknown vendor 0x%x\n", ul);
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}
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#ifdef DEBUG
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if (debug)
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delay(500);
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#endif
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/* Nothing more to do 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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#ifdef 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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have &= ~BOOT_SMASK;
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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 ((have & BOOT_SMASK) != 0)
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mask = smask;
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#ifdef 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 ((have & BOOT_ROOT) != 0 && !SAMENET(d->myip, rootip, mask)) {
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#ifdef 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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need |= BOOT_GATEIP;
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}
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if ((have & BOOT_SWAP) != 0 && !SAMENET(d->myip, swapip, mask)) {
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#ifdef 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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need |= BOOT_GATEIP;
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}
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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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#ifdef 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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have &= ~BOOT_GATEIP;
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}
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#ifdef DEBUG
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if (debug) {
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printf("gateway ip: %s\n", intoa(gateip));
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delay(500);
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}
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#endif
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return (0);
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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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vp = (struct cmu_vend *)cp;
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if (vp->v_smask.s_addr != 0 && (have & BOOT_SMASK) == 0) {
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have |= BOOT_SMASK;
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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 && (have & BOOT_GATEIP) == 0) {
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have |= BOOT_GATEIP;
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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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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 (size == sizeof(long)) {
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if (tag == TAG_SUBNET_MASK) {
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have |= BOOT_SMASK;
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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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have |= BOOT_GATEIP;
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bcopy(cp, &gateip, sizeof(gateip));
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gateip = ntohl(gateip);
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}
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}
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cp += size;
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}
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}
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