xref: /freebsd-11.0-release/contrib/tcpdump/print-bootp.c

/*
 * Copyright (c) 1990, 1991, 1993, 1994, 1995, 1996, 1997
 *	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.
 *
 * $FreeBSD: head/contrib/tcpdump/print-bootp.c 127675 2004-03-31 14:57:24Z bms $
 */
#ifndef lint
static const char rcsid[] _U_ =
    "@(#) $Header: /tcpdump/master/tcpdump/print-bootp.c,v 1.75.2.3 2004/03/02 07:45:13 hannes Exp $ (LBL)";
#endif

#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

#include <tcpdump-stdinc.h>

#include <stdio.h>
#include <string.h>

#include "interface.h"
#include "addrtoname.h"
#include "extract.h"
#include "ether.h"
#include "bootp.h"

static void rfc1048_print(const u_char *);
static void cmu_print(const u_char *);

static char tstr[] = " [|bootp]";

static const struct tok bootp_flag_values[] = {
    { 0x8000,                   "Broadcast" },
    { 0, NULL}
};

static const struct tok bootp_op_values[] = {
    { BOOTPREQUEST,             "Request" },
    { BOOTPREPLY,               "Reply" },
    { 0, NULL}
};

/*
 * Print bootp requests
 */
void
bootp_print(register const u_char *cp, u_int length)
{
	register const struct bootp *bp;
	static const u_char vm_cmu[4] = VM_CMU;
	static const u_char vm_rfc1048[4] = VM_RFC1048;

	bp = (const struct bootp *)cp;
	TCHECK(bp->bp_op);

        printf("BOOTP/DHCP, %s",
	       tok2str(bootp_op_values, "unknown (0x%02x)", bp->bp_op));

	if (bp->bp_htype == 1 && bp->bp_hlen == 6 && bp->bp_op == BOOTPREQUEST) {
		TCHECK2(bp->bp_chaddr[0], 6);
		printf(" from %s", etheraddr_string(bp->bp_chaddr));
	}

        printf(", length: %u", length);

        if (!vflag)
            return;

	TCHECK(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", EXTRACT_32BITS(&bp->bp_xid));
	if (bp->bp_secs)
		printf(", secs:%d", EXTRACT_16BITS(&bp->bp_secs));

	printf(", flags: [%s]",
	       bittok2str(bootp_flag_values, "none", EXTRACT_16BITS(&bp->bp_flags)));
	if (vflag>1)
	  printf( " (0x%04x)", EXTRACT_16BITS(&bp->bp_flags));

	/* Client's ip address */
	TCHECK(bp->bp_ciaddr);
	if (bp->bp_ciaddr.s_addr)
		printf("\n\t  Client IP: %s", ipaddr_string(&bp->bp_ciaddr));

	/* 'your' ip address (bootp client) */
	TCHECK(bp->bp_yiaddr);
	if (bp->bp_yiaddr.s_addr)
		printf("\n\t  Your IP: %s", ipaddr_string(&bp->bp_yiaddr));

	/* Server's ip address */
	TCHECK(bp->bp_siaddr);
	if (bp->bp_siaddr.s_addr)
		printf("\n\t  Server IP: %s", ipaddr_string(&bp->bp_siaddr));

	/* Gateway's ip address */
	TCHECK(bp->bp_giaddr);
	if (bp->bp_giaddr.s_addr)
		printf("\n\t  Gateway IP: %s", ipaddr_string(&bp->bp_giaddr));

	/* Client's Ethernet address */
	if (bp->bp_htype == 1 && bp->bp_hlen == 6) {
		TCHECK2(bp->bp_chaddr[0], 6);
		printf("\n\t  Client Ethernet Address: %s", etheraddr_string(bp->bp_chaddr));
	}

	TCHECK2(bp->bp_sname[0], 1);		/* check first char only */
	if (*bp->bp_sname) {
		printf("\n\t  sname \"");
		if (fn_print(bp->bp_sname, snapend)) {
			putchar('"');
			fputs(tstr + 1, stdout);
			return;
		}
		putchar('"');
	}
	TCHECK2(bp->bp_file[0], 1);		/* check first char only */
	if (*bp->bp_file) {
		printf("\n\t  file \"");
		if (fn_print(bp->bp_file, snapend)) {
			putchar('"');
			fputs(tstr + 1, stdout);
			return;
		}
		putchar('"');
	}

	/* Decode the vendor buffer */
	TCHECK(bp->bp_vend[0]);
	if (memcmp((const char *)bp->bp_vend, vm_rfc1048,
		 sizeof(u_int32_t)) == 0)
		rfc1048_print(bp->bp_vend);
	else if (memcmp((const char *)bp->bp_vend, vm_cmu,
		      sizeof(u_int32_t)) == 0)
		cmu_print(bp->bp_vend);
	else {
		u_int32_t ul;

		ul = EXTRACT_32BITS(&bp->bp_vend);
		if (ul != 0)
			printf("\n\t  Vendor-#0x%x", ul);
	}

	return;
trunc:
	fputs(tstr, stdout);
}

/*
 * The first character specifies the format to print:
 *     i - ip address (32 bits)
 *     p - ip address pairs (32 bits + 32 bits)
 *     l - long (32 bits)
 *     L - unsigned long (32 bits)
 *     s - short (16 bits)
 *     b - period-seperated decimal bytes (variable length)
 *     x - colon-seperated hex bytes (variable length)
 *     a - ascii string (variable length)
 *     B - on/off (8 bits)
 *     $ - special (explicit code to handle)
 */
static struct tok tag2str[] = {
/* RFC1048 tags */
	{ TAG_PAD,		" PAD" },
	{ TAG_SUBNET_MASK,	"iSM" },	/* subnet mask (RFC950) */
	{ TAG_TIME_OFFSET,	"LTZ" },	/* seconds from UTC */
	{ TAG_GATEWAY,		"iDG" },	/* default gateway */
	{ TAG_TIME_SERVER,	"iTS" },	/* time servers (RFC868) */
	{ TAG_NAME_SERVER,	"iIEN" },	/* IEN name servers (IEN116) */
	{ TAG_DOMAIN_SERVER,	"iNS" },	/* domain name (RFC1035) */
	{ TAG_LOG_SERVER,	"iLOG" },	/* MIT log servers */
	{ TAG_COOKIE_SERVER,	"iCS" },	/* cookie servers (RFC865) */
	{ TAG_LPR_SERVER,	"iLPR" },	/* lpr server (RFC1179) */
	{ TAG_IMPRESS_SERVER,	"iIM" },	/* impress servers (Imagen) */
	{ TAG_RLP_SERVER,	"iRL" },	/* resource location (RFC887) */
	{ TAG_HOSTNAME,		"aHN" },	/* ascii hostname */
	{ TAG_BOOTSIZE,		"sBS" },	/* 512 byte blocks */
	{ TAG_END,		" END" },
/* RFC1497 tags */
	{ TAG_DUMPPATH,		"aDP" },
	{ TAG_DOMAINNAME,	"aDN" },
	{ TAG_SWAP_SERVER,	"iSS" },
	{ TAG_ROOTPATH,		"aRP" },
	{ TAG_EXTPATH,		"aEP" },
/* RFC2132 tags */
	{ TAG_IP_FORWARD,	"BIPF" },
	{ TAG_NL_SRCRT,		"BSRT" },
	{ TAG_PFILTERS,		"pPF" },
	{ TAG_REASS_SIZE,	"sRSZ" },
	{ TAG_DEF_TTL,		"bTTL" },
	{ TAG_MTU_TIMEOUT,	"lMA" },
	{ TAG_MTU_TABLE,	"sMT" },
	{ TAG_INT_MTU,		"sMTU" },
	{ TAG_LOCAL_SUBNETS,	"BLSN" },
	{ TAG_BROAD_ADDR,	"iBR" },
	{ TAG_DO_MASK_DISC,	"BMD" },
	{ TAG_SUPPLY_MASK,	"BMS" },
	{ TAG_DO_RDISC,		"BRD" },
	{ TAG_RTR_SOL_ADDR,	"iRSA" },
	{ TAG_STATIC_ROUTE,	"pSR" },
	{ TAG_USE_TRAILERS,	"BUT" },
	{ TAG_ARP_TIMEOUT,	"lAT" },
	{ TAG_ETH_ENCAP,	"BIE" },
	{ TAG_TCP_TTL,		"bTT" },
	{ TAG_TCP_KEEPALIVE,	"lKI" },
	{ TAG_KEEPALIVE_GO,	"BKG" },
	{ TAG_NIS_DOMAIN,	"aYD" },
	{ TAG_NIS_SERVERS,	"iYS" },
	{ TAG_NTP_SERVERS,	"iNTP" },
	{ TAG_VENDOR_OPTS,	"bVO" },
	{ TAG_NETBIOS_NS,	"iWNS" },
	{ TAG_NETBIOS_DDS,	"iWDD" },
	{ TAG_NETBIOS_NODE,	"$WNT" },
	{ TAG_NETBIOS_SCOPE,	"aWSC" },
	{ TAG_XWIN_FS,		"iXFS" },
	{ TAG_XWIN_DM,		"iXDM" },
	{ TAG_NIS_P_DOMAIN,	"sN+D" },
	{ TAG_NIS_P_SERVERS,	"iN+S" },
	{ TAG_MOBILE_HOME,	"iMH" },
	{ TAG_SMPT_SERVER,	"iSMTP" },
	{ TAG_POP3_SERVER,	"iPOP3" },
	{ TAG_NNTP_SERVER,	"iNNTP" },
	{ TAG_WWW_SERVER,	"iWWW" },
	{ TAG_FINGER_SERVER,	"iFG" },
	{ TAG_IRC_SERVER,	"iIRC" },
	{ TAG_STREETTALK_SRVR,	"iSTS" },
	{ TAG_STREETTALK_STDA,	"iSTDA" },
	{ TAG_REQUESTED_IP,	"iRQ" },
	{ TAG_IP_LEASE,		"lLT" },
	{ TAG_OPT_OVERLOAD,	"$OO" },
	{ TAG_TFTP_SERVER,	"aTFTP" },
	{ TAG_BOOTFILENAME,	"aBF" },
	{ TAG_DHCP_MESSAGE,	" DHCP" },
	{ TAG_SERVER_ID,	"iSID" },
	{ TAG_PARM_REQUEST,	"bPR" },
	{ TAG_MESSAGE,		"aMSG" },
	{ TAG_MAX_MSG_SIZE,	"sMSZ" },
	{ TAG_RENEWAL_TIME,	"lRN" },
	{ TAG_REBIND_TIME,	"lRB" },
	{ TAG_VENDOR_CLASS,	"aVC" },
	{ TAG_CLIENT_ID,	"$CID" },
/* RFC 2485 */
	{ TAG_OPEN_GROUP_UAP,	"aUAP" },
/* RFC 2563 */
	{ TAG_DISABLE_AUTOCONF,	"BNOAUTO" },
/* RFC 2610 */
	{ TAG_SLP_DA,		"bSLP-DA" },	/*"b" is a little wrong */
	{ TAG_SLP_SCOPE,	"bSLP-SCOPE" },	/*"b" is a little wrong */
/* RFC 2937 */
	{ TAG_NS_SEARCH,	"sNSSEARCH" },	/* XXX 's' */
/* RFC 3011 */
	{ TAG_IP4_SUBNET_SELECT, "iSUBNET" },
/* http://www.iana.org/assignments/bootp-dhcp-extensions/index.htm */
	{ TAG_USER_CLASS,	"aCLASS" },
	{ TAG_SLP_NAMING_AUTH,	"aSLP-NA" },
	{ TAG_CLIENT_FQDN,	"$FQDN" },
	{ TAG_AGENT_CIRCUIT,	"bACKT" },
	{ TAG_AGENT_REMOTE,	"bARMT" },
	{ TAG_AGENT_MASK,	"bAMSK" },
	{ TAG_TZ_STRING,	"aTZSTR" },
	{ TAG_FQDN_OPTION,	"bFQDNS" },	/* XXX 'b' */
	{ TAG_AUTH,		"bAUTH" },	/* XXX 'b' */
	{ TAG_VINES_SERVERS,	"iVINES" },
	{ TAG_SERVER_RANK,	"sRANK" },
	{ TAG_CLIENT_ARCH,	"sARCH" },
	{ TAG_CLIENT_NDI,	"bNDI" },	/* XXX 'b' */
	{ TAG_CLIENT_GUID,	"bGUID" },	/* XXX 'b' */
	{ TAG_LDAP_URL,		"aLDAP" },
	{ TAG_6OVER4,		"i6o4" },
	{ TAG_PRINTER_NAME,	"aPRTR" },
	{ TAG_MDHCP_SERVER,	"bMDHCP" },	/* XXX 'b' */
	{ TAG_IPX_COMPAT,	"bIPX" },	/* XXX 'b' */
	{ TAG_NETINFO_PARENT,	"iNI" },
	{ TAG_NETINFO_PARENT_TAG, "aNITAG" },
	{ TAG_URL,		"aURL" },
	{ TAG_FAILOVER,		"bFAIL" },	/* XXX 'b' */
	{ 0,			NULL }
};
/* 2-byte extended tags */
static struct tok xtag2str[] = {
	{ 0,			NULL }
};

/* DHCP "options overload" types */
static struct tok oo2str[] = {
	{ 1,			"file" },
	{ 2,			"sname" },
	{ 3,			"file+sname" },
	{ 0,			NULL }
};

/* NETBIOS over TCP/IP node type options */
static struct tok nbo2str[] = {
	{ 0x1,			"b-node" },
	{ 0x2,			"p-node" },
	{ 0x4,			"m-node" },
	{ 0x8,			"h-node" },
	{ 0,			NULL }
};

/* ARP Hardware types, for Client-ID option */
static struct tok arp2str[] = {
	{ 0x1,			"ether" },
	{ 0x6,			"ieee802" },
	{ 0x7,			"arcnet" },
	{ 0xf,			"frelay" },
	{ 0x17,			"strip" },
	{ 0x18,			"ieee1394" },
	{ 0,			NULL }
};

static void
rfc1048_print(register const u_char *bp)
{
	register u_int16_t tag;
	register u_int len, size;
	register const char *cp;
	register char c;
	int first;
	u_int32_t ul;
	u_int16_t us;
	u_int8_t uc;

	printf("\n\t  Vendor-rfc1048:");

	/* Step over magic cookie */
	bp += sizeof(int32_t);

	/* Loop while we there is a tag left in the buffer */
	while (bp + 1 < snapend) {
		tag = *bp++;
		if (tag == TAG_PAD)
			continue;
		if (tag == TAG_END)
			return;
		if (tag == TAG_EXTENDED_OPTION) {
			TCHECK2(*(bp + 1), 2);
			tag = EXTRACT_16BITS(bp + 1);
			/* XXX we don't know yet if the IANA will
			 * preclude overlap of 1-byte and 2-byte spaces.
			 * If not, we need to offset tag after this step.
			 */
			cp = tok2str(xtag2str, "?xT%u", tag);
		} else
			cp = tok2str(tag2str, "?T%u", tag);
		c = *cp++;
		printf("\n\t    %s:", cp);

		/* Get the length; check for truncation */
		if (bp + 1 >= snapend) {
			fputs(tstr, stdout);
			return;
		}
		len = *bp++;
		if (bp + len >= snapend) {
			printf("[|bootp %u]", len);
			return;
		}

		if (tag == TAG_DHCP_MESSAGE && len == 1) {
			uc = *bp++;
			switch (uc) {
			case DHCPDISCOVER:	printf("DISCOVER");	break;
			case DHCPOFFER:		printf("OFFER");	break;
			case DHCPREQUEST:	printf("REQUEST");	break;
			case DHCPDECLINE:	printf("DECLINE");	break;
			case DHCPACK:		printf("ACK");		break;
			case DHCPNAK:		printf("NACK");		break;
			case DHCPRELEASE:	printf("RELEASE");	break;
			case DHCPINFORM:	printf("INFORM");	break;
			default:		printf("%u", uc);	break;
			}
			continue;
		}

		if (tag == TAG_PARM_REQUEST) {
			first = 1;
			while (len-- > 0) {
				uc = *bp++;
				cp = tok2str(tag2str, "?T%u", uc);
				if (!first)
					putchar('+');
				printf("%s", cp + 1);
				first = 0;
			}
			continue;
		}
		if (tag == TAG_EXTENDED_REQUEST) {
			first = 1;
			while (len > 1) {
				len -= 2;
				us = EXTRACT_16BITS(bp);
				bp += 2;
				cp = tok2str(xtag2str, "?xT%u", us);
				if (!first)
					putchar('+');
				printf("%s", cp + 1);
				first = 0;
			}
			continue;
		}

		/* Print data */
		size = len;
		if (c == '?') {
			/* Base default formats for unknown tags on data size */
			if (size & 1)
				c = 'b';
			else if (size & 2)
				c = 's';
			else
				c = 'l';
		}
		first = 1;
		switch (c) {

		case 'a':
			/* ascii strings */
			putchar('"');
			(void)fn_printn(bp, size, NULL);
			putchar('"');
			bp += size;
			size = 0;
			break;

		case 'i':
		case 'l':
		case 'L':
			/* ip addresses/32-bit words */
			while (size >= sizeof(ul)) {
				if (!first)
					putchar(',');
				ul = EXTRACT_32BITS(bp);
				if (c == 'i') {
					ul = htonl(ul);
					printf("%s", ipaddr_string(&ul));
				} else if (c == 'L')
					printf("%d", ul);
				else
					printf("%u", ul);
				bp += sizeof(ul);
				size -= sizeof(ul);
				first = 0;
			}
			break;

		case 'p':
			/* IP address pairs */
			while (size >= 2*sizeof(ul)) {
				if (!first)
					putchar(',');
				memcpy((char *)&ul, (const char *)bp, sizeof(ul));
				printf("(%s:", ipaddr_string(&ul));
				bp += sizeof(ul);
				memcpy((char *)&ul, (const char *)bp, sizeof(ul));
				printf("%s)", ipaddr_string(&ul));
				bp += sizeof(ul);
				size -= 2*sizeof(ul);
				first = 0;
			}
			break;

		case 's':
			/* shorts */
			while (size >= sizeof(us)) {
				if (!first)
					putchar(',');
				us = EXTRACT_16BITS(bp);
				printf("%u", us);
				bp += sizeof(us);
				size -= sizeof(us);
				first = 0;
			}
			break;

		case 'B':
			/* boolean */
			while (size > 0) {
				if (!first)
					putchar(',');
				switch (*bp) {
				case 0:
					putchar('N');
					break;
				case 1:
					putchar('Y');
					break;
				default:
					printf("%u?", *bp);
					break;
				}
				++bp;
				--size;
				first = 0;
			}
			break;

		case 'b':
		case 'x':
		default:
			/* Bytes */
			while (size > 0) {
				if (!first)
					putchar(c == 'x' ? ':' : '.');
				if (c == 'x')
					printf("%02x", *bp);
				else
					printf("%u", *bp);
				++bp;
				--size;
				first = 0;
			}
			break;

		case '$':
			/* Guys we can't handle with one of the usual cases */
			switch (tag) {

			case TAG_NETBIOS_NODE:
				tag = *bp++;
				--size;
				fputs(tok2str(nbo2str, NULL, tag), stdout);
				break;

			case TAG_OPT_OVERLOAD:
				tag = *bp++;
				--size;
				fputs(tok2str(oo2str, NULL, tag), stdout);
				break;

			case TAG_CLIENT_FQDN:
				/* option 81 should be at least 4 bytes long */
				if (len < 4)
                                        printf("ERROR: options 81 len %u < 4 bytes", len);
					break;
				if (*bp++)
					printf("[svrreg]");
				if (*bp)
					printf("%u/%u/", *bp, *(bp+1));
				bp += 2;
				putchar('"');
				(void)fn_printn(bp, size - 3, NULL);
				putchar('"');
				bp += size - 3;
				size = 0;
				break;

			case TAG_CLIENT_ID:
			    {	int type = *bp++;
				size--;
				if (type == 0) {
					putchar('"');
					(void)fn_printn(bp, size, NULL);
					putchar('"');
					bp += size;
					size = 0;
					break;
				} else {
					printf("[%s]", tok2str(arp2str, "type-%d", type));
				}
				while (size > 0) {
					if (!first)
						putchar(':');
					printf("%02x", *bp);
					++bp;
					--size;
					first = 0;
				}
				break;
			    }

			default:
				printf("[unknown special tag %u, size %u]",
				    tag, size);
				bp += size;
				size = 0;
				break;
			}
			break;
		}
		/* Data left over? */
		if (size) {
			printf("[len %u]", len);
			bp += size;
		}
	}
	return;
trunc:
	printf("|[rfc1048]");
}

static void
cmu_print(register const u_char *bp)
{
	register const struct cmu_vend *cmu;

#define PRINTCMUADDR(m, s) { TCHECK(cmu->m); \
    if (cmu->m.s_addr != 0) \
	printf(" %s:%s", s, ipaddr_string(&cmu->m.s_addr)); }

	printf(" vend-cmu");
	cmu = (const struct cmu_vend *)bp;

	/* Only print if there are unknown bits */
	TCHECK(cmu->v_flags);
	if ((cmu->v_flags & ~(VF_SMASK)) != 0)
		printf(" F:0x%x", cmu->v_flags);
	PRINTCMUADDR(v_dgate, "DG");
	PRINTCMUADDR(v_smask, cmu->v_flags & VF_SMASK ? "SM" : "SM*");
	PRINTCMUADDR(v_dns1, "NS1");
	PRINTCMUADDR(v_dns2, "NS2");
	PRINTCMUADDR(v_ins1, "IEN1");
	PRINTCMUADDR(v_ins2, "IEN2");
	PRINTCMUADDR(v_ts1, "TS1");
	PRINTCMUADDR(v_ts2, "TS2");
	return;

trunc:
	fputs(tstr, stdout);
#undef PRINTCMUADDR
}