NetBSD/sys/lib/libnetboot/bootp.c

389 lines
9.7 KiB
C

/* $NetBSD: bootp.c,v 1.5 1994/10/26 06:43:05 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 <sys/types.h>
#include <netinet/in.h>
#include <netinet/in_systm.h>
#include <errno.h>
#include <string.h>
#include "salibc.h"
#include "netboot.h"
#include "bootbootp.h"
#include "bootp.h"
/* Machinery used to insure we don't stop until we have everything we need */
#define BOOT_MYIP 0x01
#define BOOT_ROOT 0x02
#define BOOT_SWAP 0x04
#define BOOT_GATEIP 0x08 /* optional */
#define BOOT_SMASK 0x10 /* optional */
#define BOOT_UCRED 0x20 /* not implemented */
static int have;
static int need = BOOT_MYIP | BOOT_ROOT | BOOT_SWAP;
static char vm_zero[4];
static char vm_rfc1048[4] = VM_RFC1048;
static char vm_cmu[4] = VM_CMU;
static nvend;
static char *vend[] = {
vm_zero, /* try no explicit vendor type first */
vm_cmu,
vm_rfc1048 /* try variable format last */
};
/* 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(d)
register 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 DEBUG
if (debug)
printf("bootp: called\n");
#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->myport = IPPORT_BOOTPC;
d->destport = IPPORT_BOOTPS;
d->destip = INADDR_BROADCAST;
while ((have & need) != need) {
#ifdef DEBUG
if (debug)
printf("bootp: sendrecv\n");
#endif
(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 DEBUG
if (debug)
printf("bootpsend: called. we have 0x%x, and need 0x%x\n",
have, need);
#endif
bp = pkt;
bzero(bp->bp_file, sizeof(bp->bp_file));
if ((have & BOOT_ROOT) == 0)
strcpy((char *)bp->bp_file, "root");
else if ((have & BOOT_SWAP) == 0)
strcpy((char *)bp->bp_file, "swap");
bcopy(vend[nvend], bp->bp_vend, sizeof(long));
/* If we need any vendor info, cycle to a different vendor next time */
if ((need & ~have) & (BOOT_SMASK | BOOT_GATEIP))
nvend = (nvend + 1) % (sizeof(vend) / sizeof(vend[0]));
bp->bp_xid = d->xid;
bp->bp_secs = (u_long)(getsecs() - bot);
#ifdef 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;
u_long ul;
#ifdef DEBUG
if (debug)
printf("bootprecv: called\n");
#endif
bp = (struct bootp *)checkudp(d, pkt, &len);
#ifdef 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 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);
}
delay(500);
}
#endif
errno = 0;
return (-1);
}
#ifdef DEBUG
if (debug)
printf("bootprecv: got one!\n");
delay(500);
#endif
/* Pick up our ip address (and natural netmask) */
if (ntohl(bp->bp_yiaddr.s_addr) != 0 && (have & BOOT_MYIP) == 0) {
have |= BOOT_MYIP;
d->myip = ntohl(bp->bp_yiaddr.s_addr);
#ifdef 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 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_giaddr.s_addr != 0 && bp->bp_file[0] != '\0') {
if ((have & BOOT_ROOT) == 0) {
have |= BOOT_ROOT;
rootip = ntohl(bp->bp_giaddr.s_addr);
#ifdef DEBUG
if (debug)
printf("root ip address is %s\n", intoa(rootip));
#endif
strncpy(rootpath, (char *)bp->bp_file,
sizeof(rootpath));
rootpath[sizeof(rootpath) - 1] = '\0';
/* Bump xid so next request will be unique */
++d->xid;
} else if ((have & BOOT_SWAP) == 0) {
have |= BOOT_SWAP;
swapip = ntohl(bp->bp_giaddr.s_addr);
#ifdef DEBUG
if (debug)
printf("swap ip address is %s\n", intoa(swapip));
#endif
strncpy(swappath, (char *)bp->bp_file,
sizeof(swappath));
swappath[sizeof(swappath) - 1] = '\0';
/* Bump xid so next request will be unique */
++d->xid;
}
}
/* 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 if (bcmp(vm_zero, bp->bp_vend, sizeof(vm_zero)) != 0) {
bcopy(bp->bp_vend, &ul, sizeof(ul));
printf("bootprecv: unknown vendor 0x%x\n", ul);
}
#ifdef DEBUG
if (debug)
delay(500);
#endif
/* Nothing more to do if we don't know our ip address yet */
if ((have & BOOT_MYIP) == 0) {
errno = 0;
return (-1);
}
/* Check subnet mask against net mask; toss if bogus */
if ((have & BOOT_SMASK) != 0 && (nmask & smask) != nmask) {
#ifdef DEBUG
if (debug)
printf("subnet mask (%s) bad\n", intoa(smask));
#endif
smask = 0;
have &= ~BOOT_SMASK;
}
/* Get subnet (or natural net) mask */
mask = nmask;
if ((have & BOOT_SMASK) != 0)
mask = smask;
#ifdef DEBUG
if (debug)
printf("mask: %s\n", intoa(mask));
#endif
/* We need a gateway if root or swap is on a different net */
if ((have & BOOT_ROOT) != 0 && !SAMENET(d->myip, rootip, mask)) {
#ifdef DEBUG
if (debug)
printf("need gateway for root ip\n");
#endif
need |= BOOT_GATEIP;
}
if ((have & BOOT_SWAP) != 0 && !SAMENET(d->myip, swapip, mask)) {
#ifdef DEBUG
if (debug)
printf("need gateway for swap ip\n");
#endif
need |= BOOT_GATEIP;
}
/* Toss gateway if on a different net */
if ((have & BOOT_GATEIP) != 0 && !SAMENET(d->myip, gateip, mask)) {
#ifdef DEBUG
if (debug)
printf("gateway ip (%s) bad\n", intoa(gateip));
#endif
gateip = 0;
have &= ~BOOT_GATEIP;
}
#ifdef DEBUG
if (debug) {
printf("gateway ip: %s\n", intoa(gateip));
delay(500);
}
#endif
return (0);
}
static void
vend_cmu(cp)
u_char *cp;
{
register struct cmu_vend *vp;
vp = (struct cmu_vend *)cp;
if (vp->v_smask.s_addr != 0 && (have & BOOT_SMASK) == 0) {
have |= BOOT_SMASK;
smask = ntohl(vp->v_smask.s_addr);
}
if (vp->v_dgate.s_addr != 0 && (have & BOOT_GATEIP) == 0) {
have |= BOOT_GATEIP;
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;
ep = cp + len;
/* Step over magic cookie */
cp += sizeof(long);
while (cp < ep) {
tag = *cp++;
size = *cp++;
if (tag == TAG_END)
break;
if (size == sizeof(long)) {
if (tag == TAG_SUBNET_MASK) {
have |= BOOT_SMASK;
bcopy(cp, &smask, sizeof(smask));
smask = ntohl(smask);
}
if (tag == TAG_GATEWAY) {
have |= BOOT_GATEIP;
bcopy(cp, &gateip, sizeof(gateip));
gateip = ntohl(gateip);
}
}
cp += size;
}
}