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contiki/core/net/tcpdump.c

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/*
* Copyright (c) 2005, Swedish Institute of Computer Science
* 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 Institute 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 INSTITUTE 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 INSTITUTE 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.
*
* This file is part of the Contiki operating system.
*
* @(#)$Id: tcpdump.c,v 1.1 2006/06/17 22:41:18 adamdunkels Exp $
*/
#include "contiki-net.h"
#include <string.h>
#include <stdio.h>
struct ip_hdr {
/* IP header. */
u8_t vhl,
tos,
len[2],
ipid[2],
ipoffset[2],
ttl,
proto;
u16_t ipchksum;
u8_t srcipaddr[4],
destipaddr[4];
};
#define TCP_FIN 0x01
#define TCP_SYN 0x02
#define TCP_RST 0x04
#define TCP_PSH 0x08
#define TCP_ACK 0x10
#define TCP_URG 0x20
#define TCP_CTL 0x3f
struct tcpip_hdr {
/* IP header. */
u8_t vhl,
tos,
len[2],
ipid[2],
ipoffset[2],
ttl,
proto;
u16_t ipchksum;
u8_t srcipaddr[4],
destipaddr[4];
/* TCP header. */
u16_t srcport,
destport;
u8_t seqno[4],
ackno[4],
tcpoffset,
flags,
wnd[2];
u16_t tcpchksum;
u8_t urgp[2];
u8_t optdata[4];
};
#define ICMP_ECHO_REPLY 0
#define ICMP_ECHO 8
struct icmpip_hdr {
/* IP header. */
u8_t vhl,
tos,
len[2],
ipid[2],
ipoffset[2],
ttl,
proto;
u16_t ipchksum;
u8_t srcipaddr[4],
destipaddr[4];
/* The ICMP and IP headers. */
/* ICMP (echo) header. */
u8_t type, icode;
u16_t icmpchksum;
u16_t id, seqno;
};
/* The UDP and IP headers. */
struct udpip_hdr {
/* IP header. */
u8_t vhl,
tos,
len[2],
ipid[2],
ipoffset[2],
ttl,
proto;
u16_t ipchksum;
u8_t srcipaddr[4],
destipaddr[4];
/* UDP header. */
u16_t srcport,
destport;
u16_t udplen;
u16_t udpchksum;
};
#define ETHBUF ((struct eth_hdr *)&uip_buf[0])
#define IPBUF ((struct ip_hdr *)&uip_buf[UIP_LLH_LEN])
#define UDPBUF ((struct udpip_hdr *)&uip_buf[UIP_LLH_LEN])
#define ICMPBUF ((struct icmpip_hdr *)&uip_buf[UIP_LLH_LEN])
#define TCPBUF ((struct tcpip_hdr *)&uip_buf[UIP_LLH_LEN])
/*---------------------------------------------------------------------------*/
static void
tcpflags(unsigned char flags, char *flagsstr)
{
if(flags & TCP_FIN) {
*flagsstr++ = 'F';
}
if(flags & TCP_SYN) {
*flagsstr++ = 'S';
}
if(flags & TCP_RST) {
*flagsstr++ = 'R';
}
if(flags & TCP_ACK) {
*flagsstr++ = 'A';
}
if(flags & TCP_URG) {
*flagsstr++ = 'U';
}
*flagsstr = 0;
}
/*---------------------------------------------------------------------------*/
static char * CC_FASTCALL
n(u16_t num, char *ptr)
{
u16_t d;
u8_t a, f;
if(num == 0) {
*ptr = '0';
return ptr + 1;
} else {
f = 0;
for(d = 10000; d >= 1; d /= 10) {
a = (num / d) % 10;
if(f == 1 || a > 0) {
*ptr = a + '0';
++ptr;
f = 1;
}
}
}
return ptr;
}
/*---------------------------------------------------------------------------*/
static char * CC_FASTCALL
d(char *ptr)
{
*ptr = '.';
return ptr + 1;
}
/*---------------------------------------------------------------------------*/
static char * CC_FASTCALL
s(char *str, char *ptr)
{
strcpy(ptr, str);
return ptr + strlen(str);
}
/*---------------------------------------------------------------------------*/
int
tcpdump_print(char *buf, u16_t buflen)
{
char flags[8];
if(IPBUF->proto == UIP_PROTO_ICMP) {
if(ICMPBUF->type == ICMP_ECHO) {
return s(" ping",
n(IPBUF->destipaddr[3], d(
n(IPBUF->destipaddr[2], d(
n(IPBUF->destipaddr[1], d(
n(IPBUF->destipaddr[0],
s(" ",
n(IPBUF->srcipaddr[3], d(
n(IPBUF->srcipaddr[2], d(
n(IPBUF->srcipaddr[1], d(
n(IPBUF->srcipaddr[0],
buf)))))))))))))))) - buf;
/* return sprintf(buf, "%d.%d.%d.%d %d.%d.%d.%d ping",
IPBUF->srcipaddr[0], IPBUF->srcipaddr[1],
IPBUF->srcipaddr[2], IPBUF->srcipaddr[3],
IPBUF->destipaddr[0], IPBUF->destipaddr[1],
IPBUF->destipaddr[2], IPBUF->destipaddr[3]);*/
} else if(ICMPBUF->type == ICMP_ECHO_REPLY) {
return s(" pong",
n(IPBUF->destipaddr[3], d(
n(IPBUF->destipaddr[2], d(
n(IPBUF->destipaddr[1], d(
n(IPBUF->destipaddr[0],
s(" ",
n(IPBUF->srcipaddr[3], d(
n(IPBUF->srcipaddr[2], d(
n(IPBUF->srcipaddr[1], d(
n(IPBUF->srcipaddr[0],
buf)))))))))))))))) - buf;
/* return sprintf(buf, "%d.%d.%d.%d %d.%d.%d.%d pong",
IPBUF->srcipaddr[0], IPBUF->srcipaddr[1],
IPBUF->srcipaddr[2], IPBUF->srcipaddr[3],
IPBUF->destipaddr[0], IPBUF->destipaddr[1],
IPBUF->destipaddr[2], IPBUF->destipaddr[3]);*/
}
} else if(IPBUF->proto == UIP_PROTO_UDP) {
return s(" UDP",
n(htons(UDPBUF->destport), d(
n(IPBUF->destipaddr[3], d(
n(IPBUF->destipaddr[2], d(
n(IPBUF->destipaddr[1], d(
n(IPBUF->destipaddr[0],
s(" ",
n(htons(UDPBUF->srcport), d(
n(IPBUF->srcipaddr[3], d(
n(IPBUF->srcipaddr[2], d(
n(IPBUF->srcipaddr[1], d(
n(IPBUF->srcipaddr[0],
buf)))))))))))))))))))) - buf;
/* return sprintf(buf, "%d.%d.%d.%d.%d %d.%d.%d.%d.%d UDP",
IPBUF->srcipaddr[0], IPBUF->srcipaddr[1],
IPBUF->srcipaddr[2], IPBUF->srcipaddr[3],
htons(UDPBUF->srcport),
IPBUF->destipaddr[0], IPBUF->destipaddr[1],
IPBUF->destipaddr[2], IPBUF->destipaddr[3],
htons(UDPBUF->destport));*/
} else if(IPBUF->proto == UIP_PROTO_TCP) {
tcpflags(TCPBUF->flags, flags);
return s(flags,
s(" ",
n(htons(TCPBUF->destport), d(
n(IPBUF->destipaddr[3], d(
n(IPBUF->destipaddr[2], d(
n(IPBUF->destipaddr[1], d(
n(IPBUF->destipaddr[0],
s(" ",
n(htons(TCPBUF->srcport), d(
n(IPBUF->srcipaddr[3], d(
n(IPBUF->srcipaddr[2], d(
n(IPBUF->srcipaddr[1], d(
n(IPBUF->srcipaddr[0],
buf))))))))))))))))))))) - buf;
/* return sprintf(buf, "%d.%d.%d.%d.%d %d.%d.%d.%d.%d %s",
IPBUF->srcipaddr[0], IPBUF->srcipaddr[1],
IPBUF->srcipaddr[2], IPBUF->srcipaddr[3],
htons(TCPBUF->srcport),
IPBUF->destipaddr[0], IPBUF->destipaddr[1],
IPBUF->destipaddr[2], IPBUF->destipaddr[3],
htons(TCPBUF->destport),
flags); */
}
return 0;
}
/*---------------------------------------------------------------------------*/
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