494 lines
12 KiB
C
494 lines
12 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.
|
||
*
|
||
* This file was copied from tcpdump-2.1.1 and modified.
|
||
* There is an e-mail list for tcpdump: <tcpdump@ee.lbl.gov>
|
||
*/
|
||
#ifndef lint
|
||
static char rcsid[] = "$Id: print-bootp.c,v 1.2 1994/08/22 22:15:01 gwr Exp $";
|
||
/* 93/10/10 <gwr@mc.com> New data-driven option print routine. */
|
||
#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 <string.h>
|
||
#include <ctype.h>
|
||
|
||
#include "bootp.h"
|
||
#include "bootptest.h"
|
||
|
||
/* These decode the vendor data. */
|
||
static void rfc1048_print();
|
||
static void cmu_print();
|
||
static void other_print();
|
||
static void dump_hex();
|
||
|
||
/*
|
||
* Print bootp requests
|
||
*/
|
||
void
|
||
bootp_print(bp, length, sport, dport)
|
||
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;
|
||
int vdlen;
|
||
|
||
#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);
|
||
}
|
||
|
||
/* 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_hlen != 6)
|
||
printf(" hlen:%d", bp->bp_hlen);
|
||
|
||
/* Client's Hardware address */
|
||
if (bp->bp_hlen) {
|
||
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))
|
||
dump_hex(bp->bp_chaddr, bp->bp_hlen);
|
||
}
|
||
/* Only print interesting fields */
|
||
if (bp->bp_hops)
|
||
printf(" hops:%d", bp->bp_hops);
|
||
|
||
if (bp->bp_xid)
|
||
printf(" xid:%d", ntohl(bp->bp_xid));
|
||
|
||
if (bp->bp_secs)
|
||
printf(" secs:%d", ntohs(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));
|
||
|
||
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;
|
||
|
||
vdlen = sizeof(bp->bp_vend);
|
||
/* Vendor data can extend to the end of the packet. */
|
||
if (vdlen < (ep - bp->bp_vend))
|
||
vdlen = (ep - bp->bp_vend);
|
||
|
||
TCHECK(bp->bp_vend[0], vdlen);
|
||
printf(" vend");
|
||
if (!bcmp(bp->bp_vend, vm_rfc1048, sizeof(u_int32)))
|
||
rfc1048_print(bp->bp_vend, vdlen);
|
||
else if (!bcmp(bp->bp_vend, vm_cmu, sizeof(u_int32)))
|
||
cmu_print(bp->bp_vend, vdlen);
|
||
else
|
||
other_print(bp->bp_vend, vdlen);
|
||
|
||
return;
|
||
trunc:
|
||
fputs(tstr, stdout);
|
||
#undef TCHECK
|
||
}
|
||
|
||
/*
|
||
* Option description data follows.
|
||
* These are decribed in: RFC-1048, RFC-1395, RFC-1497, RFC-1533
|
||
*
|
||
* The first char of each option string encodes the data format:
|
||
* ?: unknown
|
||
* a: ASCII
|
||
* b: byte (8-bit)
|
||
* i: inet address
|
||
* l: int32
|
||
* s: short (16-bit)
|
||
*/
|
||
char *
|
||
rfc1048_opts[] = {
|
||
/* Originally from RFC-1048: */
|
||
"?PAD", /* 0: Padding - special, no data. */
|
||
"iSM", /* 1: subnet mask (RFC950)*/
|
||
"lTZ", /* 2: time offset, seconds from UTC */
|
||
"iGW", /* 3: gateways (or routers) */
|
||
"iTS", /* 4: time servers (RFC868) */
|
||
"iINS", /* 5: IEN name servers (IEN116) */
|
||
"iDNS", /* 6: domain name servers (RFC1035)(1034?) */
|
||
"iLOG", /* 7: MIT log servers */
|
||
"iCS", /* 8: cookie servers (RFC865) */
|
||
"iLPR", /* 9: lpr server (RFC1179) */
|
||
"iIPS", /* 10: impress servers (Imagen) */
|
||
"iRLP", /* 11: resource location servers (RFC887) */
|
||
"aHN", /* 12: host name (ASCII) */
|
||
"sBFS", /* 13: boot file size (in 512 byte blocks) */
|
||
|
||
/* Added by RFC-1395: */
|
||
"aDUMP", /* 14: Merit Dump File */
|
||
"aDNAM", /* 15: Domain Name (for DNS) */
|
||
"iSWAP", /* 16: Swap Server */
|
||
"aROOT", /* 17: Root Path */
|
||
|
||
/* Added by RFC-1497: */
|
||
"aEXTF", /* 18: Extensions Path (more options) */
|
||
|
||
/* Added by RFC-1533: (many, many options...) */
|
||
#if 1 /* These might not be worth recognizing by name. */
|
||
|
||
/* IP Layer Parameters, per-host (RFC-1533, sect. 4) */
|
||
"bIP-forward", /* 19: IP Forwarding flag */
|
||
"bIP-srcroute", /* 20: IP Source Routing Enable flag */
|
||
"iIP-filters", /* 21: IP Policy Filter (addr pairs) */
|
||
"sIP-maxudp", /* 22: IP Max-UDP reassembly size */
|
||
"bIP-ttlive", /* 23: IP Time to Live */
|
||
"lIP-pmtuage", /* 24: IP Path MTU aging timeout */
|
||
"sIP-pmtutab", /* 25: IP Path MTU plateau table */
|
||
|
||
/* IP parameters, per-interface (RFC-1533, sect. 5) */
|
||
"sIP-mtu-sz", /* 26: IP MTU size */
|
||
"bIP-mtu-sl", /* 27: IP MTU all subnets local */
|
||
"bIP-bcast1", /* 28: IP Broadcast Addr ones flag */
|
||
"bIP-mask-d", /* 29: IP do mask discovery */
|
||
"bIP-mask-s", /* 30: IP do mask supplier */
|
||
"bIP-rt-dsc", /* 31: IP do router discovery */
|
||
"iIP-rt-sa", /* 32: IP router solicitation addr */
|
||
"iIP-routes", /* 33: IP static routes (dst,router) */
|
||
|
||
/* Link Layer parameters, per-interface (RFC-1533, sect. 6) */
|
||
"bLL-trailer", /* 34: do tralier encapsulation */
|
||
"lLL-arp-tmo", /* 35: ARP cache timeout */
|
||
"bLL-ether2", /* 36: Ethernet version 2 (IEEE 802.3) */
|
||
|
||
/* TCP parameters (RFC-1533, sect. 7) */
|
||
"bTCP-def-ttl", /* 37: default time to live */
|
||
"lTCP-KA-tmo", /* 38: keepalive time interval */
|
||
"bTCP-KA-junk", /* 39: keepalive sends extra junk */
|
||
|
||
/* Application and Service Parameters (RFC-1533, sect. 8) */
|
||
"aNISDOM", /* 40: NIS Domain (Sun YP) */
|
||
"iNISSRV", /* 41: NIS Servers */
|
||
"iNTPSRV", /* 42: NTP (time) Servers (RFC 1129) */
|
||
"?VSINFO", /* 43: Vendor Specific Info (encapsulated) */
|
||
"iNBiosNS", /* 44: NetBIOS Name Server (RFC-1001,1..2) */
|
||
"iNBiosDD", /* 45: NetBIOS Datagram Dist. Server. */
|
||
"bNBiosNT", /* 46: NetBIOS Note Type */
|
||
"?NBiosS", /* 47: NetBIOS Scope */
|
||
"iXW-FS", /* 48: X Window System Font Servers */
|
||
"iXW-DM", /* 49: X Window System Display Managers */
|
||
|
||
/* DHCP extensions (RFC-1533, sect. 9) */
|
||
#endif
|
||
};
|
||
#define KNOWN_OPTIONS (sizeof(rfc1048_opts) / sizeof(rfc1048_opts[0]))
|
||
|
||
static void print_string();
|
||
|
||
static void
|
||
rfc1048_print(bp, length)
|
||
register u_char *bp;
|
||
int length;
|
||
{
|
||
u_char tag;
|
||
u_char *ep;
|
||
register int len, j;
|
||
u_int32 ul;
|
||
u_short us;
|
||
struct in_addr ia;
|
||
char *optstr;
|
||
|
||
printf("-rfc1395");
|
||
|
||
/* Step over magic cookie */
|
||
bp += sizeof(int32);
|
||
/* Setup end pointer */
|
||
ep = bp + length;
|
||
while (bp < ep) {
|
||
tag = *bp++;
|
||
/* Check for tags with no data first. */
|
||
if (tag == TAG_PAD)
|
||
continue;
|
||
if (tag == TAG_END)
|
||
return;
|
||
if (tag < KNOWN_OPTIONS) {
|
||
optstr = rfc1048_opts[tag];
|
||
printf(" %s:", optstr + 1);
|
||
} else {
|
||
printf(" T%d:", tag);
|
||
optstr = "?";
|
||
}
|
||
/* Now scan the length byte. */
|
||
len = *bp++;
|
||
if (bp + len > ep) {
|
||
/* truncated option */
|
||
printf(" |(%d>%d)", len, ep - bp);
|
||
return;
|
||
}
|
||
/* Print the option value(s). */
|
||
switch (optstr[0]) {
|
||
|
||
case 'a': /* ASCII string */
|
||
printfn(bp, bp + len);
|
||
bp += len;
|
||
len = 0;
|
||
break;
|
||
|
||
case 's': /* Word formats */
|
||
while (len >= 2) {
|
||
bcopy((char *) bp, (char *) &us, 2);
|
||
printf("%d", ntohs(us));
|
||
bp += 2;
|
||
len -= 2;
|
||
if (len) printf(",");
|
||
}
|
||
if (len) printf("(junk=%d)", len);
|
||
break;
|
||
|
||
case 'l': /* Long words */
|
||
while (len >= 4) {
|
||
bcopy((char *) bp, (char *) &ul, 4);
|
||
printf("%d", ntohl(ul));
|
||
bp += 4;
|
||
len -= 4;
|
||
if (len) printf(",");
|
||
}
|
||
if (len) printf("(junk=%d)", len);
|
||
break;
|
||
|
||
case 'i': /* INET addresses */
|
||
while (len >= 4) {
|
||
bcopy((char *) bp, (char *) &ia, 4);
|
||
printf("%s", ipaddr_string(&ia));
|
||
bp += 4;
|
||
len -= 4;
|
||
if (len) printf(",");
|
||
}
|
||
if (len) printf("(junk=%d)", len);
|
||
break;
|
||
|
||
case 'b':
|
||
default:
|
||
break;
|
||
|
||
} /* switch */
|
||
|
||
/* Print as characters, if appropriate. */
|
||
if (len) {
|
||
dump_hex(bp, len);
|
||
if (isascii(*bp) && isprint(*bp)) {
|
||
printf("(");
|
||
printfn(bp, bp + len);
|
||
printf(")");
|
||
}
|
||
bp += len;
|
||
len = 0;
|
||
}
|
||
} /* while bp < ep */
|
||
}
|
||
|
||
static void
|
||
cmu_print(bp, length)
|
||
register u_char *bp;
|
||
int length;
|
||
{
|
||
struct cmu_vend *v;
|
||
u_char *ep;
|
||
|
||
printf("-cmu");
|
||
|
||
v = (struct cmu_vend *) bp;
|
||
if (length < sizeof(*v)) {
|
||
printf(" |L=%d", length);
|
||
return;
|
||
}
|
||
/* Setup end pointer */
|
||
ep = bp + length;
|
||
|
||
/* Subnet mask */
|
||
if (v->v_flags & VF_SMASK) {
|
||
printf(" SM:%s", ipaddr_string(&v->v_smask));
|
||
}
|
||
/* Default gateway */
|
||
if (v->v_dgate.s_addr)
|
||
printf(" GW:%s", ipaddr_string(&v->v_dgate));
|
||
|
||
/* Domain name servers */
|
||
if (v->v_dns1.s_addr)
|
||
printf(" DNS1:%s", ipaddr_string(&v->v_dns1));
|
||
if (v->v_dns2.s_addr)
|
||
printf(" DNS2:%s", ipaddr_string(&v->v_dns2));
|
||
|
||
/* IEN-116 name servers */
|
||
if (v->v_ins1.s_addr)
|
||
printf(" INS1:%s", ipaddr_string(&v->v_ins1));
|
||
if (v->v_ins2.s_addr)
|
||
printf(" INS2:%s", ipaddr_string(&v->v_ins2));
|
||
|
||
/* Time servers */
|
||
if (v->v_ts1.s_addr)
|
||
printf(" TS1:%s", ipaddr_string(&v->v_ts1));
|
||
if (v->v_ts2.s_addr)
|
||
printf(" TS2:%s", ipaddr_string(&v->v_ts2));
|
||
|
||
}
|
||
|
||
|
||
/*
|
||
* Print out arbitrary, unknown vendor data.
|
||
*/
|
||
|
||
static void
|
||
other_print(bp, length)
|
||
register u_char *bp;
|
||
int length;
|
||
{
|
||
u_char *ep; /* end pointer */
|
||
u_char *zp; /* points one past last non-zero byte */
|
||
register int i, j;
|
||
|
||
/* Setup end pointer */
|
||
ep = bp + length;
|
||
|
||
/* Find the last non-zero byte. */
|
||
for (zp = ep; zp > bp; zp--) {
|
||
if (zp[-1] != 0)
|
||
break;
|
||
}
|
||
|
||
/* Print the all-zero case in a compact representation. */
|
||
if (zp == bp) {
|
||
printf("-all-zero");
|
||
return;
|
||
}
|
||
printf("-unknown");
|
||
|
||
/* Are there enough trailing zeros to make "00..." worthwhile? */
|
||
if (zp + 2 > ep)
|
||
zp = ep; /* print them all normally */
|
||
|
||
/* Now just print all the non-zero data. */
|
||
while (bp < zp) {
|
||
printf(".%02X", *bp);
|
||
bp++;
|
||
}
|
||
|
||
if (zp < ep)
|
||
printf(".00...");
|
||
|
||
return;
|
||
}
|
||
|
||
static void
|
||
dump_hex(bp, len)
|
||
u_char *bp;
|
||
int len;
|
||
{
|
||
while (len > 0) {
|
||
printf("%02X", *bp);
|
||
bp++;
|
||
len--;
|
||
if (len) printf(".");
|
||
}
|
||
}
|
||
|
||
/*
|
||
* Local Variables:
|
||
* tab-width: 4
|
||
* c-indent-level: 4
|
||
* c-argdecl-indent: 4
|
||
* c-continued-statement-offset: 4
|
||
* c-continued-brace-offset: -4
|
||
* c-label-offset: -4
|
||
* c-brace-offset: 0
|
||
* End:
|
||
*/
|