NetBSD/sys/lib/libsa/bootp.c

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/* $NetBSD: bootp.c,v 1.7 1995/09/18 21:19:20 pk Exp $ */
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/*
* 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.
*
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* @(#) Header: bootp.c,v 1.4 93/09/11 03:13:51 leres Exp (LBL)
*/
#include <sys/types.h>
#include <netinet/in.h>
#include <netinet/in_systm.h>
#include <string.h>
#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 __P((struct iodesc *, void *, size_t));
static ssize_t bootprecv __P((struct iodesc *, void *, size_t, time_t));
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;
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
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bp = &wbuf.wbootp;
bzero(bp, sizeof(*bp));
bp->bp_op = BOOTREQUEST;
bp->bp_htype = 1; /* 10Mb Ethernet (48 bits) */
bp->bp_hlen = 6;
bp->bp_xid = htonl(d->xid);
MACPY(d->myea, bp->bp_chaddr);
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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));
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/* Bump xid so next request will be unique. */
++d->xid;
}
/* Transmit a bootp request */
static ssize_t
bootpsend(d, pkt, len)
register struct iodesc *d;
register void *pkt;
register size_t len;
{
register 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(d, pkt, len, tleft)
register struct iodesc *d;
register void *pkt;
register size_t len;
time_t tleft;
{
register ssize_t n;
register struct bootp *bp;
#ifdef BOOTP_DEBUG
if (debug)
printf("bootprecv: called\n");
#endif
n = readudp(d, pkt, len, tleft);
if (n == -1 || 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%x, got 0x%x\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
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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(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 = vp->v_smask.s_addr;
}
if (vp->v_dgate.s_addr != 0) {
gateip = vp->v_dgate;
}
}
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));
}
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;
}
}