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|
/* $OpenBSD: print-dhcp6.c,v 1.12 2019/12/02 22:07:20 dlg Exp $ */
/*
* Copyright (c) 2019 David Gwynne <dlg@openbsd.org>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#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 "extract.h"
#include "addrtoname.h"
/* Message type */
#define DH6_SOLICIT 1
#define DH6_ADVERTISE 2
#define DH6_REQUEST 3
#define DH6_CONFIRM 4
#define DH6_RENEW 5
#define DH6_REBIND 6
#define DH6_REPLY 7
#define DH6_RELEASE 8
#define DH6_DECLINE 9
#define DH6_RECONFIGURE 10
#define DH6_INFORMATION_REQUEST 11
#define DH6_RELAY_FORW 12
#define DH6_RELAY_REPL 13
static void
dhcp6opt_print(const u_char *cp, u_int length)
{
uint16_t code, len;
u_int i;
int l = snapend - cp;
while (length > 0) {
if (l < sizeof(code))
goto trunc;
if (length < sizeof(code))
goto iptrunc;
code = EXTRACT_16BITS(cp);
cp += sizeof(code);
length -= sizeof(code);
l -= sizeof(code);
if (l < sizeof(len))
goto trunc;
if (length < sizeof(len))
goto iptrunc;
len = EXTRACT_16BITS(cp);
cp += sizeof(len);
length -= sizeof(len);
l -= sizeof(len);
printf("\n\toption %u len %u", code, len);
if (len > 0) {
if (l < len)
goto trunc;
if (length < len)
goto iptrunc;
printf(" ");
for (i = 0; i < len; i++)
printf("%02x", cp[4 + i] & 0xff);
cp += len;
length -= len;
l -= len;
}
}
return;
trunc:
printf(" [|dhcp6opt]");
return;
iptrunc:
printf(" ip truncated");
}
static void
dhcp6_relay_print(const u_char *cp, u_int length)
{
uint8_t msgtype;
const char *msgname = NULL;
msgtype = *cp;
switch (msgtype) {
case DH6_RELAY_FORW:
msgname = "Relay-forward";
break;
case DH6_RELAY_REPL:
msgname = "Relay-reply";
break;
}
printf(" %s", msgname);
}
void
dhcp6_print(const u_char *cp, u_int length)
{
uint8_t msgtype;
uint32_t hdr;
int l = snapend - cp;
const char *msgname;
printf("DHCPv6");
if (l < sizeof(msgtype))
goto trunc;
if (length < sizeof(msgtype))
goto iptrunc;
msgtype = *cp;
switch (msgtype) {
case DH6_SOLICIT:
msgname = "Solicit";
break;
case DH6_ADVERTISE:
msgname = "Advertise";
break;
case DH6_REQUEST:
msgname = "Request";
break;
case DH6_CONFIRM:
msgname = "Confirm";
break;
case DH6_RENEW:
msgname = "Renew";
break;
case DH6_REBIND:
msgname = "Rebind";
break;
case DH6_REPLY:
msgname = "Reply";
break;
case DH6_RELEASE:
msgname = "Release";
break;
case DH6_DECLINE:
msgname = "Decline";
break;
case DH6_RECONFIGURE:
msgname = "Reconfigure";
break;
case DH6_INFORMATION_REQUEST:
msgname = "Information-request";
break;
case DH6_RELAY_FORW:
case DH6_RELAY_REPL:
dhcp6_relay_print(cp, length);
return;
default:
printf(" unknown message type %u", msgtype);
return;
}
printf(" %s", msgname);
if (l < sizeof(hdr))
goto trunc;
if (length < sizeof(hdr))
goto iptrunc;
hdr = EXTRACT_32BITS(cp);
printf(" xid %x", hdr & 0xffffff);
if (vflag) {
cp += sizeof(hdr);
length -= sizeof(hdr);
dhcp6opt_print(cp, length);
}
return;
trunc:
printf(" [|dhcp6]");
return;
iptrunc:
printf(" ip truncated");
}
|
