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tcpdump/print-dhcp6.c

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/*
* 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 1.2 1999-11-21 09:36:50 fenner 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 "interface.h"
#include "addrtoname.h"
#include "dhcp6.h"
#include "dhcp6opt.h"
#if 0
static void dhcp6opttab_init __P((void));
#endif
static struct dhcp6_opt *dhcp6opttab_byname __P((char *));
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
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;
}
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 *q;
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);
}
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