print-dhcp6.c - platform/external/tcpdump - Git at Google

 /*
  * Copyright (C) 1998 and 1999 WIDE Project.
  * All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
  *    documentation and/or other materials provided with the distribution.
  * 3. Neither the name of the project 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 BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  * SUCH DAMAGE.
  */

 #ifndef lint
 static const char rcsid[] =
     "@(#) $Header: /tcpdump/master/tcpdump/print-dhcp6.c,v 1.3 1999-12-22 06:27:20 itojun Exp $";
 #endif

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

 #include <sys/param.h>
 #include <sys/time.h>
 #include <sys/socket.h>

 #if __STDC__
 struct mbuf;
 struct rtentry;
 #endif
 #include <net/if.h>

 #include <netinet/in.h>

 #include <ctype.h>
 #ifdef HAVE_MEMORY_H
 #include <memory.h>
 #endif
 #include <stdio.h>
 #include <string.h>
 #include <arpa/inet.h>

 #include "interface.h"
 #include "addrtoname.h"
 #include "dhcp6.h"
 #include "dhcp6opt.h"

 #if 0
 static void dhcp6opttab_init __P((void));
 static struct dhcp6_opt *dhcp6opttab_byname __P((char *));
 #endif
 static struct dhcp6_opt *dhcp6opttab_bycode __P((u_int));

 static char tstr[] = " [|dhcp6]";

 static struct dhcp6_opt dh6opttab[] = {
 	/* IP Address Extension */
 	{ 1, OL6_N,	"IP Address",			OT6_NONE, },

 	/* General Extension */
 	{ 2, 4,		"Time Offset",			OT6_NUM, },
 	{ 3, OL6_N,	"IEEE 1003.1 POSIX Timezone",	OT6_STR, },
 	{ 6, OL6_16N,	"Domain Name Server",		OT6_V6, },
 	{ 10, OL6_N,	"Domain Name",			OT6_STR, },

 	/* Application and Service Parameters */
 	{ 16, OL6_N,	"Directory Agent",		OT6_NONE, },
 	{ 17, OL6_N,	"Service Scope"	,		OT6_NONE, },
 	{ 18, OL6_16N,	"Network Time Protocol Servers", OT6_V6, },
 	{ 19, OL6_N,	"NIS Domain",			OT6_STR, },
 	{ 20, OL6_16N,	"NIS Servers",			OT6_V6, },
 	{ 21, OL6_N,	"NIS+ Domain",			OT6_STR, },
 	{ 22, OL6_16N,	"NIS+ Servers",			OT6_V6, },

 	/* TCP Parameters */
 	{ 32, 4,	"TCP Keepalive Interval",	OT6_NUM, },

 	/* DHCPv6 Extensions */
 	{ 40, 4,	"Maximum DHCPv6 Message Size",	OT6_NUM, },
 	{ 41, OL6_N,	"DHCP Retransmission and Configuration Parameter",
 							OT6_NONE, },
 	{ 48, OL6_N,	"Platform Specific Information", OT6_NONE, },
 	{ 49, OL6_N,	"Platform Class Identifier",	OT6_STR, },
 	{ 64, OL6_N,	"Class Identifier",		OT6_STR, },
 	{ 66, 16,	"Reconfigure Multicast Address", OT6_V6, },
 	{ 67, 16,	"Renumber DHCPv6 Server Address",
 							OT6_V6, },
 	{ 68, OL6_N,	"DHCP Relay ICMP Error Message", OT6_NONE, },
 	{ 84, OL6_N,	"Client-Server Authentication",	OT6_NONE, },
 	{ 85, 4,	"Client Key Selection",		OT6_NUM, },

 	/* End Extension */
 	{ 65536, OL6_Z,	"End",				OT6_NONE, },

 	{ 0 },
 };

 #if 0
 static struct dhcp6_opt *dh6o_pad;
 static struct dhcp6_opt *dh6o_end;

 static void
 dhcp6opttab_init()
 {
 	dh6o_pad = dhcp6opttab_bycode(0);
 	dh6o_end = dhcp6opttab_bycode(65536);
 }
 #endif

 #if 0
 static struct dhcp6_opt *
 dhcp6opttab_byname(name)
 	char *name;
 {
 	struct dhcp6_opt *p;

 	for (p = dh6opttab; p->code; p++)
 		if (strcmp(name, p->name) == 0)
 			return p;
 	return NULL;
 }
 #endif

 static struct dhcp6_opt *
 dhcp6opttab_bycode(code)
 	u_int code;
 {
 	struct dhcp6_opt *p;

 	for (p = dh6opttab; p->code; p++)
 		if (p->code == code)
 			return p;
 	return NULL;
 }

 static void
 dhcp6ext_print(u_char *cp, u_char *ep)
 {
 	u_int16_t code, len;
 	struct dhcp6_opt *p;
 	char buf[BUFSIZ];
 	int i;

 	if (cp == ep)
 		return;
 	printf(" ");
 	while (cp < ep) {
 		code = ntohs(*(u_int16_t *)&cp[0]);
 		if (code != 65535)
 			len = ntohs(*(u_int16_t *)&cp[2]);
 		else
 			len = 0;
 		p = dhcp6opttab_bycode(code);
 		if (p == NULL) {
 			printf("(unknown, len=%d)", len);
 			cp += len + 4;
 			continue;
 		}

 		/* sanity check on length */
 		switch (p->len) {
 		case OL6_N:
 			break;
 		case OL6_16N:
 			if (len % 16 != 0)
 				goto trunc;
 			break;
 		case OL6_Z:
 			if (len != 0)
 				goto trunc;
 			break;
 		default:
 			if (len != p->len)
 				goto trunc;
 			break;
 		}
 		if (cp + 4 + len > ep) {
 			printf("[|%s]", p->name);
 			return;
 		}

 		printf("(%s, ", p->name);
 		switch (p->type) {
 		case OT6_V6:
 			for (i = 0; i < len; i += 16) {
 				inet_ntop(AF_INET6, &cp[4 + i], buf,
 					sizeof(buf));
 				if (i != 0)
 					printf(",");
 				printf("%s", buf);
 			}
 			break;
 		case OT6_STR:
 			memset(&buf, 0, sizeof(buf));
 			strncpy(buf, &cp[4], len);
 			printf("%s", buf);
 			break;
 		case OT6_NUM:
 			printf("%d", (u_int32_t)ntohl(*(u_int32_t *)&cp[4]));
 			break;
 		default:
 			for (i = 0; i < len; i++)
 				printf("%02x", cp[4 + i] & 0xff);
 		}
 		printf(")");
 		cp += len + 4;
 	}
 	return;

 trunc:
 	printf("[|dhcp6ext]");
 }

 /*
  * Print dhcp6 requests
  */
 void
 dhcp6_print(register const u_char *cp, u_int length,
 	    u_short sport, u_short dport)
 {
 	union dhcp6 *dh6;
 	u_char *ep;
 	u_char *extp;

 	printf("dhcp6");

 	ep = (u_char *)snapend;

 	dh6 = (union dhcp6 *)cp;
 	TCHECK(dh6->dh6_msgtype);
 	switch (dh6->dh6_msgtype) {
 	case DH6_SOLICIT:
 		if (vflag && TTEST(dh6->dh6_sol.dh6sol_relayaddr)) {
 			printf(" solicit(");
 			if ((dh6->dh6_sol.dh6sol_flags & DH6SOL_CLOSE) != 0)
 				printf("C");
 			if (dh6->dh6_sol.dh6sol_flags != 0)
 				printf(" ");
 			printf("cliaddr=%s",
 				ip6addr_string(&dh6->dh6_sol.dh6sol_cliaddr));
 			printf(" relayaddr=%s",
 				ip6addr_string(&dh6->dh6_sol.dh6sol_relayaddr));
 			printf(")");
 		} else
 			printf(" solicit");
 		break;
 	case DH6_ADVERT:
 		if (!(vflag && TTEST(dh6->dh6_adv.dh6adv_serveraddr))) {
 			printf(" advert");
 			break;
 		}
 		printf(" advert(");
 		if ((dh6->dh6_adv.dh6adv_flags & DH6ADV_SERVPRESENT) != 0)
 			printf("S");
 		if (dh6->dh6_adv.dh6adv_flags != 0)
 			printf(" ");
 		printf("pref=%u", dh6->dh6_adv.dh6adv_pref);
 		printf(" cliaddr=%s",
 			ip6addr_string(&dh6->dh6_adv.dh6adv_cliaddr));
 		printf(" relayaddr=%s",
 			ip6addr_string(&dh6->dh6_adv.dh6adv_relayaddr));
 		printf(" servaddr=%s",
 			ip6addr_string(&dh6->dh6_adv.dh6adv_serveraddr));
 		extp = (u_char *)((&dh6->dh6_adv) + 1);
 		dhcp6ext_print(extp, ep);
 		printf(")");
 		break;
 	case DH6_REQUEST:
 		if (!(vflag && TTEST(dh6->dh6_req.dh6req_relayaddr))) {
 			printf(" request");
 			break;
 		}
 		printf(" request(");
 		if ((dh6->dh6_req.dh6req_flags & DH6REQ_CLOSE) != 0)
 			printf("C");
 		if ((dh6->dh6_req.dh6req_flags & DH6REQ_SERVPRESENT) != 0)
 			printf("S");
 		if ((dh6->dh6_req.dh6req_flags & DH6REQ_REBOOT) != 0)
 			printf("R");
 		if (dh6->dh6_req.dh6req_flags != 0)
 			printf(" ");
 		printf("xid=0x%04x", dh6->dh6_req.dh6req_xid);
 		printf(" cliaddr=%s",
 			ip6addr_string(&dh6->dh6_req.dh6req_cliaddr));
 		printf(" relayaddr=%s",
 			ip6addr_string(&dh6->dh6_req.dh6req_relayaddr));
 		extp = (char *)((&dh6->dh6_req) + 1);
 		if ((dh6->dh6_req.dh6req_flags & DH6REQ_SERVPRESENT) != 0) {
 			printf(" servaddr=%s", ip6addr_string(extp));
 			extp += 16;
 		}
 		dhcp6ext_print(extp, ep);
 		printf(")");
 		break;
 	case DH6_REPLY:
 		if (!(vflag && TTEST(dh6->dh6_rep.dh6rep_xid))) {
 			printf(" reply");
 			break;
 		}
 		printf(" reply(");
 		if ((dh6->dh6_rep.dh6rep_flagandstat & DH6REP_CLIPRESENT) != 0)
 			printf("C");
 		if (dh6->dh6_rep.dh6rep_flagandstat != 0)
 			printf(" ");
 		printf("stat=0x%02x",
 			dh6->dh6_rep.dh6rep_flagandstat & DH6REP_STATMASK);
 		extp = (u_char *)((&dh6->dh6_rep) + 1);
 		if ((dh6->dh6_rep.dh6rep_flagandstat & DH6REP_CLIPRESENT) != 0) {
 			printf(" cliaddr=%s", ip6addr_string(extp));
 			extp += 16;
 		}
 		dhcp6ext_print(extp, ep);
 		printf(")");
 		break;
 	case DH6_RELEASE:
 		printf(" release");
 		break;
 	case DH6_RECONFIG:
 		printf(" reconfig");
 		break;
 	}
 	return;

 trunc:
 	printf("%s", tstr);
 }
	/*
	* Copyright (C) 1998 and 1999 WIDE Project.
	* All rights reserved.
	*
	* Redistribution and use in source and binary forms, with or without
	* modification, are permitted provided that the following conditions
	* are met:
	* 1. Redistributions of source code must retain the above copyright
	* notice, this list of conditions and the following disclaimer.
	* 2. Redistributions in binary form must reproduce the above copyright
	* notice, this list of conditions and the following disclaimer in the
	* documentation and/or other materials provided with the distribution.
	* 3. Neither the name of the project 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 BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
	* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
	* ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
	* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
	* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
	* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
	* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
	* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
	* SUCH DAMAGE.
	*/

	#ifndef lint
	static const char rcsid[] =
	"@(#) $Header: /tcpdump/master/tcpdump/print-dhcp6.c,v 1.3 1999-12-22 06:27:20 itojun Exp $";
	#endif

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

	#include <sys/param.h>
	#include <sys/time.h>
	#include <sys/socket.h>

	#if __STDC__
	struct mbuf;
	struct rtentry;
	#endif
	#include <net/if.h>

	#include <netinet/in.h>

	#include <ctype.h>
	#ifdef HAVE_MEMORY_H
	#include <memory.h>
	#endif
	#include <stdio.h>
	#include <string.h>
	#include <arpa/inet.h>

	#include "interface.h"
	#include "addrtoname.h"
	#include "dhcp6.h"
	#include "dhcp6opt.h"

	#if 0
	static void dhcp6opttab_init __P((void));
	static struct dhcp6_opt dhcp6opttab_byname __P((char ));
	#endif
	static struct dhcp6_opt *dhcp6opttab_bycode __P((u_int));

	static char tstr[] = " [\|dhcp6]";

	static struct dhcp6_opt dh6opttab[] = {
	/* IP Address Extension */
	{ 1, OL6_N, "IP Address", OT6_NONE, },

	/* General Extension */
	{ 2, 4, "Time Offset", OT6_NUM, },
	{ 3, OL6_N, "IEEE 1003.1 POSIX Timezone", OT6_STR, },
	{ 6, OL6_16N, "Domain Name Server", OT6_V6, },
	{ 10, OL6_N, "Domain Name", OT6_STR, },

	/* Application and Service Parameters */
	{ 16, OL6_N, "Directory Agent", OT6_NONE, },
	{ 17, OL6_N, "Service Scope" , OT6_NONE, },
	{ 18, OL6_16N, "Network Time Protocol Servers", OT6_V6, },
	{ 19, OL6_N, "NIS Domain", OT6_STR, },
	{ 20, OL6_16N, "NIS Servers", OT6_V6, },
	{ 21, OL6_N, "NIS+ Domain", OT6_STR, },
	{ 22, OL6_16N, "NIS+ Servers", OT6_V6, },

	/* TCP Parameters */
	{ 32, 4, "TCP Keepalive Interval", OT6_NUM, },

	/* DHCPv6 Extensions */
	{ 40, 4, "Maximum DHCPv6 Message Size", OT6_NUM, },
	{ 41, OL6_N, "DHCP Retransmission and Configuration Parameter",
	OT6_NONE, },
	{ 48, OL6_N, "Platform Specific Information", OT6_NONE, },
	{ 49, OL6_N, "Platform Class Identifier", OT6_STR, },
	{ 64, OL6_N, "Class Identifier", OT6_STR, },
	{ 66, 16, "Reconfigure Multicast Address", OT6_V6, },
	{ 67, 16, "Renumber DHCPv6 Server Address",
	OT6_V6, },
	{ 68, OL6_N, "DHCP Relay ICMP Error Message", OT6_NONE, },
	{ 84, OL6_N, "Client-Server Authentication", OT6_NONE, },
	{ 85, 4, "Client Key Selection", OT6_NUM, },

	/* End Extension */
	{ 65536, OL6_Z, "End", OT6_NONE, },

	{ 0 },
	};

	#if 0
	static struct dhcp6_opt *dh6o_pad;
	static struct dhcp6_opt *dh6o_end;

	static void
	dhcp6opttab_init()
	{
	dh6o_pad = dhcp6opttab_bycode(0);
	dh6o_end = dhcp6opttab_bycode(65536);
	}
	#endif

	#if 0
	static struct dhcp6_opt *
	dhcp6opttab_byname(name)
	char *name;
	{
	struct dhcp6_opt *p;

	for (p = dh6opttab; p->code; p++)
	if (strcmp(name, p->name) == 0)
	return p;
	return NULL;
	}
	#endif

	static struct dhcp6_opt *
	dhcp6opttab_bycode(code)
	u_int code;
	{
	struct dhcp6_opt *p;

	for (p = dh6opttab; p->code; p++)
	if (p->code == code)
	return p;
	return NULL;
	}

	static void
	dhcp6ext_print(u_char cp, u_char ep)
	{
	u_int16_t code, len;
	struct dhcp6_opt *p;
	char buf[BUFSIZ];
	int i;

	if (cp == ep)
	return;
	printf(" ");
	while (cp < ep) {
	code = ntohs((u_int16_t )&cp[0]);
	if (code != 65535)
	len = ntohs((u_int16_t )&cp[2]);
	else
	len = 0;
	p = dhcp6opttab_bycode(code);
	if (p == NULL) {
	printf("(unknown, len=%d)", len);
	cp += len + 4;
	continue;
	}

	/* sanity check on length */
	switch (p->len) {
	case OL6_N:
	break;
	case OL6_16N:
	if (len % 16 != 0)
	goto trunc;
	break;
	case OL6_Z:
	if (len != 0)
	goto trunc;
	break;
	default:
	if (len != p->len)
	goto trunc;
	break;
	}
	if (cp + 4 + len > ep) {
	printf("[\|%s]", p->name);
	return;
	}

	printf("(%s, ", p->name);
	switch (p->type) {
	case OT6_V6:
	for (i = 0; i < len; i += 16) {
	inet_ntop(AF_INET6, &cp[4 + i], buf,
	sizeof(buf));
	if (i != 0)
	printf(",");
	printf("%s", buf);
	}
	break;
	case OT6_STR:
	memset(&buf, 0, sizeof(buf));
	strncpy(buf, &cp[4], len);
	printf("%s", buf);
	break;
	case OT6_NUM:
	printf("%d", (u_int32_t)ntohl((u_int32_t )&cp[4]));
	break;
	default:
	for (i = 0; i < len; i++)
	printf("%02x", cp[4 + i] & 0xff);
	}
	printf(")");
	cp += len + 4;
	}
	return;

	trunc:
	printf("[\|dhcp6ext]");
	}

	/*
	* Print dhcp6 requests
	*/
	void
	dhcp6_print(register const u_char *cp, u_int length,
	u_short sport, u_short dport)
	{
	union dhcp6 *dh6;
	u_char *ep;
	u_char *extp;

	printf("dhcp6");

	ep = (u_char *)snapend;

	dh6 = (union dhcp6 *)cp;
	TCHECK(dh6->dh6_msgtype);
	switch (dh6->dh6_msgtype) {
	case DH6_SOLICIT:
	if (vflag && TTEST(dh6->dh6_sol.dh6sol_relayaddr)) {
	printf(" solicit(");
	if ((dh6->dh6_sol.dh6sol_flags & DH6SOL_CLOSE) != 0)
	printf("C");
	if (dh6->dh6_sol.dh6sol_flags != 0)
	printf(" ");
	printf("cliaddr=%s",
	ip6addr_string(&dh6->dh6_sol.dh6sol_cliaddr));
	printf(" relayaddr=%s",
	ip6addr_string(&dh6->dh6_sol.dh6sol_relayaddr));
	printf(")");
	} else
	printf(" solicit");
	break;
	case DH6_ADVERT:
	if (!(vflag && TTEST(dh6->dh6_adv.dh6adv_serveraddr))) {
	printf(" advert");
	break;
	}
	printf(" advert(");
	if ((dh6->dh6_adv.dh6adv_flags & DH6ADV_SERVPRESENT) != 0)
	printf("S");
	if (dh6->dh6_adv.dh6adv_flags != 0)
	printf(" ");
	printf("pref=%u", dh6->dh6_adv.dh6adv_pref);
	printf(" cliaddr=%s",
	ip6addr_string(&dh6->dh6_adv.dh6adv_cliaddr));
	printf(" relayaddr=%s",
	ip6addr_string(&dh6->dh6_adv.dh6adv_relayaddr));
	printf(" servaddr=%s",
	ip6addr_string(&dh6->dh6_adv.dh6adv_serveraddr));
	extp = (u_char *)((&dh6->dh6_adv) + 1);
	dhcp6ext_print(extp, ep);
	printf(")");
	break;
	case DH6_REQUEST:
	if (!(vflag && TTEST(dh6->dh6_req.dh6req_relayaddr))) {
	printf(" request");
	break;
	}
	printf(" request(");
	if ((dh6->dh6_req.dh6req_flags & DH6REQ_CLOSE) != 0)
	printf("C");
	if ((dh6->dh6_req.dh6req_flags & DH6REQ_SERVPRESENT) != 0)
	printf("S");
	if ((dh6->dh6_req.dh6req_flags & DH6REQ_REBOOT) != 0)
	printf("R");
	if (dh6->dh6_req.dh6req_flags != 0)
	printf(" ");
	printf("xid=0x%04x", dh6->dh6_req.dh6req_xid);
	printf(" cliaddr=%s",
	ip6addr_string(&dh6->dh6_req.dh6req_cliaddr));
	printf(" relayaddr=%s",
	ip6addr_string(&dh6->dh6_req.dh6req_relayaddr));
	extp = (char *)((&dh6->dh6_req) + 1);
	if ((dh6->dh6_req.dh6req_flags & DH6REQ_SERVPRESENT) != 0) {
	printf(" servaddr=%s", ip6addr_string(extp));
	extp += 16;
	}
	dhcp6ext_print(extp, ep);
	printf(")");
	break;
	case DH6_REPLY:
	if (!(vflag && TTEST(dh6->dh6_rep.dh6rep_xid))) {
	printf(" reply");
	break;
	}
	printf(" reply(");
	if ((dh6->dh6_rep.dh6rep_flagandstat & DH6REP_CLIPRESENT) != 0)
	printf("C");
	if (dh6->dh6_rep.dh6rep_flagandstat != 0)
	printf(" ");
	printf("stat=0x%02x",
	dh6->dh6_rep.dh6rep_flagandstat & DH6REP_STATMASK);
	extp = (u_char *)((&dh6->dh6_rep) + 1);
	if ((dh6->dh6_rep.dh6rep_flagandstat & DH6REP_CLIPRESENT) != 0) {
	printf(" cliaddr=%s", ip6addr_string(extp));
	extp += 16;
	}
	dhcp6ext_print(extp, ep);
	printf(")");
	break;
	case DH6_RELEASE:
	printf(" release");
	break;
	case DH6_RECONFIG:
	printf(" reconfig");
	break;
	}
	return;

	trunc:
	printf("%s", tstr);
	}