290 lines
7.7 KiB
C
290 lines
7.7 KiB
C
/*
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* Copyright (c) 2005, Swedish Institute of Computer Science
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the Institute nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* This file is part of the Contiki operating system.
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*
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* @(#)$Id: tcpdump.c,v 1.2 2006/10/09 11:53:56 adamdunkels Exp $
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*/
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#include "contiki-net.h"
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#include <string.h>
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#include <stdio.h>
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struct ip_hdr {
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/* IP header. */
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u8_t vhl,
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tos,
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len[2],
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ipid[2],
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ipoffset[2],
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ttl,
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proto;
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u16_t ipchksum;
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u8_t srcipaddr[4],
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destipaddr[4];
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};
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#define TCP_FIN 0x01
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#define TCP_SYN 0x02
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#define TCP_RST 0x04
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#define TCP_PSH 0x08
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#define TCP_ACK 0x10
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#define TCP_URG 0x20
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#define TCP_CTL 0x3f
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struct tcpip_hdr {
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/* IP header. */
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u8_t vhl,
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tos,
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len[2],
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ipid[2],
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ipoffset[2],
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ttl,
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proto;
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u16_t ipchksum;
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u8_t srcipaddr[4],
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destipaddr[4];
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/* TCP header. */
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u16_t srcport,
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destport;
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u8_t seqno[4],
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ackno[4],
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tcpoffset,
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flags,
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wnd[2];
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u16_t tcpchksum;
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u8_t urgp[2];
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u8_t optdata[4];
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};
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#define ICMP_ECHO_REPLY 0
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#define ICMP_ECHO 8
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struct icmpip_hdr {
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/* IP header. */
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u8_t vhl,
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tos,
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len[2],
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ipid[2],
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ipoffset[2],
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ttl,
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proto;
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u16_t ipchksum;
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u8_t srcipaddr[4],
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destipaddr[4];
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/* The ICMP and IP headers. */
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/* ICMP (echo) header. */
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u8_t type, icode;
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u16_t icmpchksum;
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u16_t id, seqno;
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};
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/* The UDP and IP headers. */
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struct udpip_hdr {
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/* IP header. */
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u8_t vhl,
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tos,
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len[2],
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ipid[2],
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ipoffset[2],
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ttl,
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proto;
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u16_t ipchksum;
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u8_t srcipaddr[4],
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destipaddr[4];
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/* UDP header. */
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u16_t srcport,
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destport;
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u16_t udplen;
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u16_t udpchksum;
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};
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#define ETHBUF ((struct eth_hdr *)&packet[0])
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#define IPBUF ((struct ip_hdr *)&packet[0])
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#define UDPBUF ((struct udpip_hdr *)&packet[0])
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#define ICMPBUF ((struct icmpip_hdr *)&packet[0])
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#define TCPBUF ((struct tcpip_hdr *)&packet[0])
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/*---------------------------------------------------------------------------*/
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static void
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tcpflags(unsigned char flags, char *flagsstr)
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{
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if(flags & TCP_FIN) {
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*flagsstr++ = 'F';
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}
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if(flags & TCP_SYN) {
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*flagsstr++ = 'S';
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}
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if(flags & TCP_RST) {
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*flagsstr++ = 'R';
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}
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if(flags & TCP_ACK) {
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*flagsstr++ = 'A';
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}
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if(flags & TCP_URG) {
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*flagsstr++ = 'U';
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}
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*flagsstr = 0;
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}
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/*---------------------------------------------------------------------------*/
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static char * CC_FASTCALL
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n(u16_t num, char *ptr)
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{
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u16_t d;
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u8_t a, f;
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if(num == 0) {
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*ptr = '0';
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return ptr + 1;
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} else {
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f = 0;
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for(d = 10000; d >= 1; d /= 10) {
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a = (num / d) % 10;
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if(f == 1 || a > 0) {
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*ptr = a + '0';
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++ptr;
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f = 1;
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}
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}
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}
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return ptr;
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}
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/*---------------------------------------------------------------------------*/
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static char * CC_FASTCALL
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d(char *ptr)
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{
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*ptr = '.';
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return ptr + 1;
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}
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/*---------------------------------------------------------------------------*/
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static char * CC_FASTCALL
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s(char *str, char *ptr)
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{
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strcpy(ptr, str);
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return ptr + strlen(str);
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}
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/*---------------------------------------------------------------------------*/
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int
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tcpdump_format(u8_t *packet, u16_t packetlen,
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char *buf, u16_t buflen)
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{
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char flags[8];
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if(IPBUF->proto == UIP_PROTO_ICMP) {
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if(ICMPBUF->type == ICMP_ECHO) {
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return s(" ping",
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n(IPBUF->destipaddr[3], d(
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n(IPBUF->destipaddr[2], d(
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n(IPBUF->destipaddr[1], d(
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n(IPBUF->destipaddr[0],
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s(" ",
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n(IPBUF->srcipaddr[3], d(
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n(IPBUF->srcipaddr[2], d(
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n(IPBUF->srcipaddr[1], d(
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n(IPBUF->srcipaddr[0],
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buf)))))))))))))))) - buf;
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/* return sprintf(buf, "%d.%d.%d.%d %d.%d.%d.%d ping",
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IPBUF->srcipaddr[0], IPBUF->srcipaddr[1],
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IPBUF->srcipaddr[2], IPBUF->srcipaddr[3],
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IPBUF->destipaddr[0], IPBUF->destipaddr[1],
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IPBUF->destipaddr[2], IPBUF->destipaddr[3]);*/
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} else if(ICMPBUF->type == ICMP_ECHO_REPLY) {
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return s(" pong",
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n(IPBUF->destipaddr[3], d(
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n(IPBUF->destipaddr[2], d(
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n(IPBUF->destipaddr[1], d(
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n(IPBUF->destipaddr[0],
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s(" ",
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n(IPBUF->srcipaddr[3], d(
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n(IPBUF->srcipaddr[2], d(
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n(IPBUF->srcipaddr[1], d(
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n(IPBUF->srcipaddr[0],
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buf)))))))))))))))) - buf;
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/* return sprintf(buf, "%d.%d.%d.%d %d.%d.%d.%d pong",
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IPBUF->srcipaddr[0], IPBUF->srcipaddr[1],
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IPBUF->srcipaddr[2], IPBUF->srcipaddr[3],
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IPBUF->destipaddr[0], IPBUF->destipaddr[1],
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IPBUF->destipaddr[2], IPBUF->destipaddr[3]);*/
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}
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} else if(IPBUF->proto == UIP_PROTO_UDP) {
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return s(" UDP",
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n(htons(UDPBUF->destport), d(
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n(IPBUF->destipaddr[3], d(
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n(IPBUF->destipaddr[2], d(
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n(IPBUF->destipaddr[1], d(
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n(IPBUF->destipaddr[0],
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s(" ",
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n(htons(UDPBUF->srcport), d(
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n(IPBUF->srcipaddr[3], d(
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n(IPBUF->srcipaddr[2], d(
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n(IPBUF->srcipaddr[1], d(
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n(IPBUF->srcipaddr[0],
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buf)))))))))))))))))))) - buf;
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/* return sprintf(buf, "%d.%d.%d.%d.%d %d.%d.%d.%d.%d UDP",
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IPBUF->srcipaddr[0], IPBUF->srcipaddr[1],
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IPBUF->srcipaddr[2], IPBUF->srcipaddr[3],
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htons(UDPBUF->srcport),
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IPBUF->destipaddr[0], IPBUF->destipaddr[1],
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IPBUF->destipaddr[2], IPBUF->destipaddr[3],
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htons(UDPBUF->destport));*/
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} else if(IPBUF->proto == UIP_PROTO_TCP) {
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tcpflags(TCPBUF->flags, flags);
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return s(flags,
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s(" ",
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n(htons(TCPBUF->destport), d(
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n(IPBUF->destipaddr[3], d(
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n(IPBUF->destipaddr[2], d(
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n(IPBUF->destipaddr[1], d(
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n(IPBUF->destipaddr[0],
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s(" ",
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n(htons(TCPBUF->srcport), d(
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n(IPBUF->srcipaddr[3], d(
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n(IPBUF->srcipaddr[2], d(
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n(IPBUF->srcipaddr[1], d(
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n(IPBUF->srcipaddr[0],
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buf))))))))))))))))))))) - buf;
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/* return sprintf(buf, "%d.%d.%d.%d.%d %d.%d.%d.%d.%d %s",
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IPBUF->srcipaddr[0], IPBUF->srcipaddr[1],
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IPBUF->srcipaddr[2], IPBUF->srcipaddr[3],
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htons(TCPBUF->srcport),
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IPBUF->destipaddr[0], IPBUF->destipaddr[1],
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IPBUF->destipaddr[2], IPBUF->destipaddr[3],
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htons(TCPBUF->destport),
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flags); */
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} else {
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strcpy(buf, "Unrecognized protocol");
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}
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return 0;
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}
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/*---------------------------------------------------------------------------*/
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