NetBSD-5.0.2/usr.sbin/bootp/bootptest/print-bootp.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>
*/
#include <sys/cdefs.h>
#ifndef lint
__RCSID("$NetBSD: print-bootp.c,v 1.9 2008/05/02 19:22:10 xtraeme 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 <strings.h>
#include <ctype.h>
#include "bootp.h"
#include "bootptest.h"
/* These decode the vendor data. */
static void cmu_print(u_char *, int);
static void dump_hex(u_char *, int);
static void other_print(u_char *, int);
static void rfc1048_print(u_char *, int);
/*
* Print bootp requests
*/
void
bootp_print(struct bootp *bp, int length, u_short sport, u_short 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) {
struct ether_header *eh;
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)
*/
const 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
rfc1048_print(u_char *bp, int length)
{
u_char tag;
u_char *ep;
int len;
u_int32 ul;
u_short us;
struct in_addr ia;
const 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>%ld)", len, (long)(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(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(u_char *bp, int length)
{
u_char *ep; /* end pointer */
u_char *zp; /* points one past last non-zero byte */
/* 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(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:
*/