path: root/usr.sbin/tcpdump/print-dhcp6.c

/*	$OpenBSD: print-dhcp6.c,v 1.11 2018/10/22 16:12:45 kn Exp $	*/

/*
 * 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.
 */

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

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

#include <netinet/in.h>

#include <ctype.h>
#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(void);
static struct dhcp6_opt *dhcp6opttab_byname(char *);
#endif
static struct dhcp6_opt *dhcp6opttab_bycode(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));
			strlcpy(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(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);
}