482 lines
12 KiB
C
482 lines
12 KiB
C
/*
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* Copyright (c) 1988-1990 The Regents of the University of California.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that: (1) source code distributions
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* retain the above copyright notice and this paragraph in its entirety, (2)
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* distributions including binary code include the above copyright notice and
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* this paragraph in its entirety in the documentation or other materials
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* provided with the distribution, and (3) all advertising materials mentioning
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* features or use of this software display the following acknowledgement:
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* ``This product includes software developed by the University of California,
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* Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
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* the University nor the names of its contributors may be used to endorse
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* or promote products derived from this software without specific prior
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* written permission.
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
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* WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
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*
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* Format and print bootp packets.
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*
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* This file was copied from tcpdump-2.1.1 and modified.
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* There is an e-mail list for tcpdump: <tcpdump@ee.lbl.gov>
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*/
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#include <sys/cdefs.h>
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#ifndef lint
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__RCSID("$NetBSD: print-bootp.c,v 1.7 2002/07/14 00:30:02 wiz Exp $");
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/* 93/10/10 <gwr@mc.com> New data-driven option print routine. */
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#endif
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#include <stdio.h>
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#include <sys/param.h>
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <net/if.h>
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#include <netinet/in.h>
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#include <string.h>
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#include <ctype.h>
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#include "bootp.h"
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#include "bootptest.h"
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/* These decode the vendor data. */
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static void cmu_print(u_char *, int);
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static void dump_hex(u_char *, int);
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static void other_print(u_char *, int);
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static void rfc1048_print(u_char *, int);
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/*
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* Print bootp requests
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*/
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void
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bootp_print(struct bootp *bp, int length, u_short sport, u_short dport)
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{
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static char tstr[] = " [|bootp]";
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static unsigned char vm_cmu[4] = VM_CMU;
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static unsigned char vm_rfc1048[4] = VM_RFC1048;
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u_char *ep;
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int vdlen;
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#define TCHECK(var, l) if ((u_char *)&(var) > ep - l) goto trunc
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/* Note funny sized packets */
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if (length != sizeof(struct bootp))
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(void) printf(" [len=%d]", length);
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/* 'ep' points to the end of avaible data. */
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ep = (u_char *) snapend;
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switch (bp->bp_op) {
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case BOOTREQUEST:
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/* Usually, a request goes from a client to a server */
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if (sport != IPPORT_BOOTPC || dport != IPPORT_BOOTPS)
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printf(" (request)");
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break;
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case BOOTREPLY:
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/* Usually, a reply goes from a server to a client */
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if (sport != IPPORT_BOOTPS || dport != IPPORT_BOOTPC)
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printf(" (reply)");
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break;
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default:
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printf(" bootp-#%d", bp->bp_op);
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}
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/* The usual hardware address type is 1 (10Mb Ethernet) */
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if (bp->bp_htype != 1)
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printf(" htype:%d", bp->bp_htype);
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/* The usual length for 10Mb Ethernet address is 6 bytes */
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if (bp->bp_hlen != 6)
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printf(" hlen:%d", bp->bp_hlen);
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/* Client's Hardware address */
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if (bp->bp_hlen) {
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struct ether_header *eh;
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char *e;
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TCHECK(bp->bp_chaddr[0], 6);
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eh = (struct ether_header *) packetp;
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if (bp->bp_op == BOOTREQUEST)
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e = (char *) ESRC(eh);
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else if (bp->bp_op == BOOTREPLY)
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e = (char *) EDST(eh);
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else
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e = 0;
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if (e == 0 || bcmp((char *) bp->bp_chaddr, e, 6))
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dump_hex(bp->bp_chaddr, bp->bp_hlen);
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}
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/* Only print interesting fields */
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if (bp->bp_hops)
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printf(" hops:%d", bp->bp_hops);
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if (bp->bp_xid)
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printf(" xid:%d", ntohl(bp->bp_xid));
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if (bp->bp_secs)
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printf(" secs:%d", ntohs(bp->bp_secs));
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/* Client's ip address */
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TCHECK(bp->bp_ciaddr, sizeof(bp->bp_ciaddr));
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if (bp->bp_ciaddr.s_addr)
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printf(" C:%s", ipaddr_string(&bp->bp_ciaddr));
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/* 'your' ip address (bootp client) */
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TCHECK(bp->bp_yiaddr, sizeof(bp->bp_yiaddr));
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if (bp->bp_yiaddr.s_addr)
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printf(" Y:%s", ipaddr_string(&bp->bp_yiaddr));
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/* Server's ip address */
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TCHECK(bp->bp_siaddr, sizeof(bp->bp_siaddr));
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if (bp->bp_siaddr.s_addr)
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printf(" S:%s", ipaddr_string(&bp->bp_siaddr));
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/* Gateway's ip address */
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TCHECK(bp->bp_giaddr, sizeof(bp->bp_giaddr));
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if (bp->bp_giaddr.s_addr)
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printf(" G:%s", ipaddr_string(&bp->bp_giaddr));
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TCHECK(bp->bp_sname[0], sizeof(bp->bp_sname));
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if (*bp->bp_sname) {
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printf(" sname:");
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if (printfn(bp->bp_sname, ep)) {
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fputs(tstr + 1, stdout);
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return;
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}
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}
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TCHECK(bp->bp_file[0], sizeof(bp->bp_file));
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if (*bp->bp_file) {
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printf(" file:");
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if (printfn(bp->bp_file, ep)) {
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fputs(tstr + 1, stdout);
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return;
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}
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}
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/* Don't try to decode the vendor buffer unless we're verbose */
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if (vflag <= 0)
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return;
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vdlen = sizeof(bp->bp_vend);
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/* Vendor data can extend to the end of the packet. */
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if (vdlen < (ep - bp->bp_vend))
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vdlen = (ep - bp->bp_vend);
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TCHECK(bp->bp_vend[0], vdlen);
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printf(" vend");
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if (!bcmp(bp->bp_vend, vm_rfc1048, sizeof(u_int32)))
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rfc1048_print(bp->bp_vend, vdlen);
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else if (!bcmp(bp->bp_vend, vm_cmu, sizeof(u_int32)))
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cmu_print(bp->bp_vend, vdlen);
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else
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other_print(bp->bp_vend, vdlen);
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return;
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trunc:
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fputs(tstr, stdout);
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#undef TCHECK
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}
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/*
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* Option description data follows.
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* These are decribed in: RFC-1048, RFC-1395, RFC-1497, RFC-1533
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*
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* The first char of each option string encodes the data format:
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* ?: unknown
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* a: ASCII
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* b: byte (8-bit)
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* i: inet address
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* l: int32
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* s: short (16-bit)
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*/
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char *
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rfc1048_opts[] = {
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/* Originally from RFC-1048: */
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"?PAD", /* 0: Padding - special, no data. */
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"iSM", /* 1: subnet mask (RFC950)*/
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"lTZ", /* 2: time offset, seconds from UTC */
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"iGW", /* 3: gateways (or routers) */
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"iTS", /* 4: time servers (RFC868) */
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"iINS", /* 5: IEN name servers (IEN116) */
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"iDNS", /* 6: domain name servers (RFC1035)(1034?) */
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"iLOG", /* 7: MIT log servers */
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"iCS", /* 8: cookie servers (RFC865) */
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"iLPR", /* 9: lpr server (RFC1179) */
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"iIPS", /* 10: impress servers (Imagen) */
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"iRLP", /* 11: resource location servers (RFC887) */
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"aHN", /* 12: host name (ASCII) */
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"sBFS", /* 13: boot file size (in 512 byte blocks) */
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/* Added by RFC-1395: */
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"aDUMP", /* 14: Merit Dump File */
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"aDNAM", /* 15: Domain Name (for DNS) */
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"iSWAP", /* 16: Swap Server */
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"aROOT", /* 17: Root Path */
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/* Added by RFC-1497: */
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"aEXTF", /* 18: Extensions Path (more options) */
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/* Added by RFC-1533: (many, many options...) */
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#if 1 /* These might not be worth recognizing by name. */
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/* IP Layer Parameters, per-host (RFC-1533, sect. 4) */
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"bIP-forward", /* 19: IP Forwarding flag */
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"bIP-srcroute", /* 20: IP Source Routing Enable flag */
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"iIP-filters", /* 21: IP Policy Filter (addr pairs) */
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"sIP-maxudp", /* 22: IP Max-UDP reassembly size */
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"bIP-ttlive", /* 23: IP Time to Live */
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"lIP-pmtuage", /* 24: IP Path MTU aging timeout */
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"sIP-pmtutab", /* 25: IP Path MTU plateau table */
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/* IP parameters, per-interface (RFC-1533, sect. 5) */
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"sIP-mtu-sz", /* 26: IP MTU size */
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"bIP-mtu-sl", /* 27: IP MTU all subnets local */
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"bIP-bcast1", /* 28: IP Broadcast Addr ones flag */
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"bIP-mask-d", /* 29: IP do mask discovery */
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"bIP-mask-s", /* 30: IP do mask supplier */
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"bIP-rt-dsc", /* 31: IP do router discovery */
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"iIP-rt-sa", /* 32: IP router solicitation addr */
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"iIP-routes", /* 33: IP static routes (dst,router) */
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/* Link Layer parameters, per-interface (RFC-1533, sect. 6) */
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"bLL-trailer", /* 34: do tralier encapsulation */
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"lLL-arp-tmo", /* 35: ARP cache timeout */
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"bLL-ether2", /* 36: Ethernet version 2 (IEEE 802.3) */
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/* TCP parameters (RFC-1533, sect. 7) */
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"bTCP-def-ttl", /* 37: default time to live */
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"lTCP-KA-tmo", /* 38: keepalive time interval */
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"bTCP-KA-junk", /* 39: keepalive sends extra junk */
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/* Application and Service Parameters (RFC-1533, sect. 8) */
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"aNISDOM", /* 40: NIS Domain (Sun YP) */
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"iNISSRV", /* 41: NIS Servers */
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"iNTPSRV", /* 42: NTP (time) Servers (RFC 1129) */
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"?VSINFO", /* 43: Vendor Specific Info (encapsulated) */
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"iNBiosNS", /* 44: NetBIOS Name Server (RFC-1001,1..2) */
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"iNBiosDD", /* 45: NetBIOS Datagram Dist. Server. */
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"bNBiosNT", /* 46: NetBIOS Note Type */
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"?NBiosS", /* 47: NetBIOS Scope */
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"iXW-FS", /* 48: X Window System Font Servers */
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"iXW-DM", /* 49: X Window System Display Managers */
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/* DHCP extensions (RFC-1533, sect. 9) */
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#endif
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};
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#define KNOWN_OPTIONS (sizeof(rfc1048_opts) / sizeof(rfc1048_opts[0]))
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static void
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rfc1048_print(u_char *bp, int length)
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{
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u_char tag;
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u_char *ep;
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int len;
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u_int32 ul;
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u_short us;
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struct in_addr ia;
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char *optstr;
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printf("-rfc1395");
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/* Step over magic cookie */
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bp += sizeof(int32);
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/* Setup end pointer */
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ep = bp + length;
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while (bp < ep) {
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tag = *bp++;
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/* Check for tags with no data first. */
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if (tag == TAG_PAD)
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continue;
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if (tag == TAG_END)
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return;
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if (tag < KNOWN_OPTIONS) {
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optstr = rfc1048_opts[tag];
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printf(" %s:", optstr + 1);
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} else {
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printf(" T%d:", tag);
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optstr = "?";
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}
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/* Now scan the length byte. */
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len = *bp++;
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if (bp + len > ep) {
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/* truncated option */
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printf(" |(%d>%ld)", len, (long)(ep - bp));
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return;
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}
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/* Print the option value(s). */
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switch (optstr[0]) {
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case 'a': /* ASCII string */
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printfn(bp, bp + len);
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bp += len;
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len = 0;
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break;
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case 's': /* Word formats */
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while (len >= 2) {
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bcopy((char *) bp, (char *) &us, 2);
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printf("%d", ntohs(us));
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bp += 2;
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len -= 2;
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if (len) printf(",");
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}
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if (len) printf("(junk=%d)", len);
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break;
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case 'l': /* Long words */
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while (len >= 4) {
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bcopy((char *) bp, (char *) &ul, 4);
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printf("%d", ntohl(ul));
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bp += 4;
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len -= 4;
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if (len) printf(",");
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}
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if (len) printf("(junk=%d)", len);
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break;
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case 'i': /* INET addresses */
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while (len >= 4) {
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bcopy((char *) bp, (char *) &ia, 4);
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printf("%s", ipaddr_string(&ia));
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bp += 4;
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len -= 4;
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if (len) printf(",");
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}
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if (len) printf("(junk=%d)", len);
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break;
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case 'b':
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default:
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break;
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} /* switch */
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/* Print as characters, if appropriate. */
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if (len) {
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dump_hex(bp, len);
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if (isascii(*bp) && isprint(*bp)) {
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printf("(");
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printfn(bp, bp + len);
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printf(")");
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}
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bp += len;
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len = 0;
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}
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} /* while bp < ep */
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}
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static void
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cmu_print(u_char *bp, int length)
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{
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struct cmu_vend *v;
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u_char *ep;
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printf("-cmu");
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v = (struct cmu_vend *) bp;
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if (length < sizeof(*v)) {
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printf(" |L=%d", length);
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return;
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}
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/* Setup end pointer */
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ep = bp + length;
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/* Subnet mask */
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if (v->v_flags & VF_SMASK) {
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printf(" SM:%s", ipaddr_string(&v->v_smask));
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}
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/* Default gateway */
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if (v->v_dgate.s_addr)
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printf(" GW:%s", ipaddr_string(&v->v_dgate));
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/* Domain name servers */
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if (v->v_dns1.s_addr)
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printf(" DNS1:%s", ipaddr_string(&v->v_dns1));
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if (v->v_dns2.s_addr)
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printf(" DNS2:%s", ipaddr_string(&v->v_dns2));
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/* IEN-116 name servers */
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if (v->v_ins1.s_addr)
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printf(" INS1:%s", ipaddr_string(&v->v_ins1));
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if (v->v_ins2.s_addr)
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printf(" INS2:%s", ipaddr_string(&v->v_ins2));
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/* Time servers */
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if (v->v_ts1.s_addr)
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printf(" TS1:%s", ipaddr_string(&v->v_ts1));
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if (v->v_ts2.s_addr)
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printf(" TS2:%s", ipaddr_string(&v->v_ts2));
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}
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/*
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* Print out arbitrary, unknown vendor data.
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*/
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static void
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other_print(u_char *bp, int length)
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{
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u_char *ep; /* end pointer */
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u_char *zp; /* points one past last non-zero byte */
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/* Setup end pointer */
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ep = bp + length;
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/* Find the last non-zero byte. */
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for (zp = ep; zp > bp; zp--) {
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if (zp[-1] != 0)
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break;
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}
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/* Print the all-zero case in a compact representation. */
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if (zp == bp) {
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printf("-all-zero");
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return;
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}
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printf("-unknown");
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/* Are there enough trailing zeros to make "00..." worthwhile? */
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if (zp + 2 > ep)
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zp = ep; /* print them all normally */
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/* Now just print all the non-zero data. */
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while (bp < zp) {
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printf(".%02X", *bp);
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bp++;
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}
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if (zp < ep)
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printf(".00...");
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return;
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}
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static void
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dump_hex(u_char *bp, int len)
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{
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while (len > 0) {
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printf("%02X", *bp);
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bp++;
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len--;
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if (len) printf(".");
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}
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}
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/*
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* Local Variables:
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* tab-width: 4
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* c-indent-level: 4
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* c-argdecl-indent: 4
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* c-continued-statement-offset: 4
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* c-continued-brace-offset: -4
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* c-label-offset: -4
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* c-brace-offset: 0
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* End:
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*/
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