NetBSD/usr.sbin/tcpdump/print-bootp.c

266 lines
6.3 KiB
C

/*
* Copyright (c) 1988-1990 The Regents of the University of California.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that: (1) source code distributions
* retain the above copyright notice and this paragraph in its entirety, (2)
* distributions including binary code include the above copyright notice and
* this paragraph in its entirety in the documentation or other materials
* provided with the distribution, and (3) all advertising materials mentioning
* features or use of this software display the following acknowledgement:
* ``This product includes software developed by the University of California,
* Lawrence Berkeley Laboratory and its contributors.'' 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 ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
* WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
*
* Format and print bootp packets.
*
* $Id: print-bootp.c,v 1.1 1993/11/14 21:20:35 deraadt Exp $
*/
#ifndef lint
static char rcsid[] =
"@(#) Header: print-bootp.c,v 1.17 91/11/14 22:21:34 leres Exp (LBL)";
#endif
#include <stdio.h>
#include <sys/param.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <net/if.h>
#include <netinet/in.h>
#include <netinet/if_ether.h>
#include <strings.h>
#include <ctype.h>
#include "interface.h"
#include "addrtoname.h"
#include "bootp.h"
void rfc1048_print();
void cmu_print();
/*
* Print bootp requests
*/
void
bootp_print(bp, length, sport, dport)
register struct bootp *bp;
int length;
u_short sport, dport;
{
static char tstr[] = " [|bootp]";
static unsigned char vm_cmu[4] = VM_CMU;
static unsigned char vm_rfc1048[4] = VM_RFC1048;
u_char *ep;
#define TCHECK(var, l) if ((u_char *)&(var) > ep - l) goto trunc
/* Note funny sized packets */
if (length != sizeof(struct bootp))
(void)printf(" [len=%d]", length);
/* 'ep' points to the end of avaible data. */
ep = (u_char *)snapend;
switch (bp->bp_op) {
case BOOTREQUEST:
/* Usually, a request goes from a client to a server */
if (sport != IPPORT_BOOTPC || dport != IPPORT_BOOTPS)
printf(" (request)");
break;
case BOOTREPLY:
/* Usually, a reply goes from a server to a client */
if (sport != IPPORT_BOOTPS || dport != IPPORT_BOOTPC)
printf(" (reply)");
break;
default:
printf(" bootp-#%d", bp->bp_op);
}
NTOHL(bp->bp_xid);
NTOHS(bp->bp_secs);
/* The usual hardware address type is 1 (10Mb Ethernet) */
if (bp->bp_htype != 1)
printf(" htype-#%d", bp->bp_htype);
/* The usual length for 10Mb Ethernet address is 6 bytes */
if (bp->bp_htype != 1 || bp->bp_hlen != 6)
printf(" hlen:%d", bp->bp_hlen);
/* Only print interesting fields */
if (bp->bp_hops)
printf(" hops:%d", bp->bp_hops);
if (bp->bp_xid)
printf(" xid:0x%x", bp->bp_xid);
if (bp->bp_secs)
printf(" secs:%d", bp->bp_secs);
/* Client's ip address */
TCHECK(bp->bp_ciaddr, sizeof(bp->bp_ciaddr));
if (bp->bp_ciaddr.s_addr)
printf(" C:%s", ipaddr_string(&bp->bp_ciaddr));
/* 'your' ip address (bootp client) */
TCHECK(bp->bp_yiaddr, sizeof(bp->bp_yiaddr));
if (bp->bp_yiaddr.s_addr)
printf(" Y:%s", ipaddr_string(&bp->bp_yiaddr));
/* Server's ip address */
TCHECK(bp->bp_siaddr, sizeof(bp->bp_siaddr));
if (bp->bp_siaddr.s_addr)
printf(" S:%s", ipaddr_string(&bp->bp_siaddr));
/* Gateway's ip address */
TCHECK(bp->bp_giaddr, sizeof(bp->bp_giaddr));
if (bp->bp_giaddr.s_addr)
printf(" G:%s", ipaddr_string(&bp->bp_giaddr));
/* Client's Ethernet address */
if (bp->bp_htype == 1 && bp->bp_hlen == 6) {
register struct ether_header *eh;
register char *e;
TCHECK(bp->bp_chaddr[0], 6);
eh = (struct ether_header *)packetp;
if (bp->bp_op == BOOTREQUEST)
e = (char *)ESRC(eh);
else if (bp->bp_op == BOOTREPLY)
e = (char *)EDST(eh);
else
e = 0;
if (e == 0 || bcmp((char *)bp->bp_chaddr, e, 6) != 0)
printf(" ether %s", etheraddr_string(bp->bp_chaddr));
}
TCHECK(bp->bp_sname[0], sizeof(bp->bp_sname));
if (*bp->bp_sname) {
printf(" sname ");
if (printfn(bp->bp_sname, ep)) {
fputs(tstr + 1, stdout);
return;
}
}
TCHECK(bp->bp_file[0], sizeof(bp->bp_file));
if (*bp->bp_file) {
printf(" file ");
if (printfn(bp->bp_file, ep)) {
fputs(tstr + 1, stdout);
return;
}
}
/* Don't try to decode the vendor buffer unless we're verbose */
if (vflag <= 0)
return;
TCHECK(bp->bp_vend[0], sizeof(bp->bp_vend));
printf(" vend");
if (bcmp(bp->bp_vend, vm_rfc1048, sizeof(u_long)) == 0)
rfc1048_print(bp->bp_vend, sizeof(bp->bp_vend));
else if (bcmp(bp->bp_vend, vm_cmu, sizeof(u_long)) == 0)
cmu_print(bp->bp_vend, sizeof(bp->bp_vend));
else {
u_long ul;
bcopy((char *)bp->bp_vend, (char *)&ul, sizeof(ul));
printf("-#0x%x", ul);
}
return;
trunc:
fputs(tstr, stdout);
#undef TCHECK
}
void
rfc1048_print(bp, length)
register u_char *bp;
int length;
{
u_char tag;
u_char *ep;
register int i;
u_long ul;
printf("-rfc1048");
/* Step over magic cookie */
bp += sizeof(long);
/* Setup end pointer */
ep = bp + length;
while (bp < ep) {
tag = *bp++;
i = *bp++;
switch (tag) {
case TAG_PAD:
/* no-op */
break;
case TAG_SUBNET_MASK:
ul = 0;
bcopy((char *)bp, (char *)&ul, i);
printf(" SM:%s", ipaddr_string(&ul));
break;
case TAG_TIME_SERVER:
ul = 0;
bcopy((char *)bp, (char *)&ul, i);
printf(" TS:%s", ipaddr_string(&ul));
break;
case TAG_GATEWAY:
ul = 0;
bcopy((char *)bp, (char *)&ul, i);
printf(" G:%s", ipaddr_string(&ul));
break;
case TAG_TIME_OFFSET:
case TAG_NAME_SERVER:
case TAG_DOMAIN_SERVER:
case TAG_LOG_SERVER:
case TAG_COOKIE_SERVER:
case TAG_LPR_SERVER:
case TAG_IMPRESS_SERVER:
case TAG_RLP_SERVER:
case TAG_HOSTNAME:
case TAG_BOOTSIZE:
printf(" tag-#%d", tag);
if (i == sizeof(long)) {
bcopy((char *)bp, (char *)&ul, sizeof(long));
printf(":0x%x", ul);
} else
printf(":?");
break;
case TAG_END:
return;
default:
printf("[tag-#%d]", tag);
return;
}
}
}
void
cmu_print(bp, length)
register u_char *bp;
int length;
{
/* XXX not really implemented */
printf("-cmu [...]");
}