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factor out struct tcphdr #248

merged 2 commits into from Apr 11, 2013
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Just for now

@@ -20,6 +20,8 @@
#define __FAVOR_BSD
#include <netinet/tcp.h>
#include <netinet/udp.h>
#include "tcphdr.h"

#include <arpa/inet.h>
#include <pcap.h>
#include "SIPdump.h"
@@ -494,7 +496,7 @@ static void sniff_logins(unsigned char *args,
const struct ip6_hdr *ip6;
const struct ip *ip_hdr;
const struct tcphdr *tcp_hdr;
const struct tcp_hdr *tcp_hdr;
const struct udphdr *udp_hdr;
unsigned char *payload;
int ip_protocol, ip_tot_len;
@@ -548,7 +550,7 @@ static void sniff_logins(unsigned char *args,
/* Check proto and get source and destination port */
switch (ip_protocol) {
tcp_hdr = (struct tcphdr *) (packet + size_ip);
tcp_hdr = (struct tcp_hdr *) (packet + size_ip);
size_proto = tcp_hdr->th_off * 4;
if (size_proto < 20) {
@@ -0,0 +1,36 @@
#ifndef TCPHDR_H
#define TCPHDR_H

#ifdef __cplusplus
extern "C" {

#include <stdint.h>
#include <endian.h>

struct tcp_hdr {
uint16_t th_sport;
uint16_t th_dport;
uint32_t th_seq;
uint32_t th_ack;
uint8_t th_x2:4;
uint8_t th_off:4;
uint8_t th_off:4;
uint8_t th_x2:4;
#error invalid byte order
uint8_t th_flags;
uint16_t th_win;
uint16_t th_sum;
uint16_t th_urp;

#ifdef __cplusplus


@@ -40,6 +40,7 @@
#define __FAVOR_BSD
#include <netinet/ip.h>
#include <netinet/tcp.h>
#include "tcphdr.h"
#include <pcap.h>

using namespace std;
@@ -117,12 +118,12 @@ bool Packet_Reader::kick()
continue; // bogus IP header

if (header.len <
sizeof(struct ether_header) + size_ip + sizeof(tcphdr))
sizeof(struct ether_header) + size_ip + sizeof(struct tcp_hdr))

const struct tcphdr *tcp =
const struct tcp_hdr *tcp =
reinterpret_cast <
const struct tcphdr *>(packet + sizeof(ether_header) +
const struct tcp_hdr *>(packet + sizeof(ether_header) +

size_t size_tcp = tcp->th_off * 4;
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