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show_data.c
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#include <unistd.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <netinet/ip_icmp.h>
#include <netinet/udp.h>
#include <netinet/tcp.h>
#include <netinet/ip.h>
#include <sys/socket.h>
#include <arpa/inet.h>
#include "sniffer.h"
#include "tools.h"
void print_ip_header(unsigned char *buf, int size, t_sniffer *sniffer)
{
unsigned short iphdrlen;
struct iphdr *iph;
struct sockaddr_in source;
struct sockaddr_in dest;
iph = (struct iphdr *)buf;
iphdrlen = iph->ihl*4;
(void)iphdrlen;
(void)size;
memset(&source, 0, sizeof(source));
source.sin_addr.s_addr = iph->saddr;
memset(&dest, 0, sizeof(dest));
dest.sin_addr.s_addr = iph->daddr;
fprintf(sniffer->logfile,"\n");
fprintf(sniffer->logfile,"IP Header\n");
fprintf(sniffer->logfile," |-IP Version : %d\n",(unsigned int)iph->version);
fprintf(sniffer->logfile," |-IP Header Length : %d DWORDS or %d Bytes\n",(unsigned int)iph->ihl,((unsigned int)(iph->ihl))*4);
fprintf(sniffer->logfile," |-Type Of Service : %d\n",(unsigned int)iph->tos);
fprintf(sniffer->logfile," |-IP Total Length : %d Bytes(size of Packet)\n",ntohs(iph->tot_len));
fprintf(sniffer->logfile," |-Identification : %d\n",ntohs(iph->id));
fprintf(sniffer->logfile," |-TTL : %d\n",(unsigned int)iph->ttl);
fprintf(sniffer->logfile," |-Protocol : %d\n",(unsigned int)iph->protocol);
fprintf(sniffer->logfile," |-Checksum : %d\n",ntohs(iph->check));
fprintf(sniffer->logfile," |-Source IP : %s\n",inet_ntoa(source.sin_addr));
fprintf(sniffer->logfile," |-Destination IP : %s\n",inet_ntoa(dest.sin_addr));
}
void print_tcp_packet(unsigned char *buf, int size, t_sniffer *sniffer)
{
unsigned short iphdrlen;
struct iphdr *iph;
struct tcphdr *tcph;
iph = (struct iphdr *)buf;
iphdrlen = iph->ihl * 4;
tcph = (struct tcphdr*)(buf + iphdrlen);
print_ip_header(buf, size, sniffer);
fprintf(sniffer->logfile,"\n");
fprintf(sniffer->logfile,"TCP Header\n");
fprintf(sniffer->logfile," |-Source Port : %u\n",ntohs(tcph->source));
fprintf(sniffer->logfile," |-Destination Port : %u\n",ntohs(tcph->dest));
fprintf(sniffer->logfile," |-Sequence Number : %u\n",ntohl(tcph->seq));
fprintf(sniffer->logfile," |-Acknowledge Number : %u\n",ntohl(tcph->ack_seq));
fprintf(sniffer->logfile," |-Header Length : %d DWORDS or %d BYTES\n" ,(unsigned int)tcph->doff,(unsigned int)tcph->doff*4);
fprintf(sniffer->logfile," |-Urgent Flag : %d\n",(unsigned int)tcph->urg);
fprintf(sniffer->logfile," |-Acknowledgement Flag : %d\n",(unsigned int)tcph->ack);
fprintf(sniffer->logfile," |-Push Flag : %d\n",(unsigned int)tcph->psh);
fprintf(sniffer->logfile," |-Reset Flag : %d\n",(unsigned int)tcph->rst);
fprintf(sniffer->logfile," |-Synchronise Flag : %d\n",(unsigned int)tcph->syn);
fprintf(sniffer->logfile," |-Finish Flag : %d\n",(unsigned int)tcph->fin);
fprintf(sniffer->logfile," |-Window : %d\n",ntohs(tcph->window));
fprintf(sniffer->logfile," |-Checksum : %d\n",ntohs(tcph->check));
fprintf(sniffer->logfile," |-Urgent Pointer : %d\n",tcph->urg_ptr);
fprintf(sniffer->logfile,"\n");
fprintf(sniffer->logfile," DATA Dump ");
fprintf(sniffer->logfile,"\n");
fprintf(sniffer->logfile,"IP Header\n");
PrintData(buf, iphdrlen, sniffer);
fprintf(sniffer->logfile,"TCP Header\n");
PrintData(buf+iphdrlen, tcph->doff*4, sniffer);
fprintf(sniffer->logfile,"Data Payload\n");
PrintData(buf + iphdrlen + tcph->doff*4,
(size - tcph->doff*4-iph->ihl*4),
sniffer );
fprintf(sniffer->logfile,"\n###########################################################");
}
void print_udp_packet(unsigned char *buf , int size, t_sniffer *sniffer)
{
unsigned short iphdrlen;
struct iphdr *iph;
struct udphdr *udph;
iph = (struct iphdr *)buf;
iphdrlen = iph->ihl*4;
udph = (struct udphdr*)(buf + iphdrlen);
fprintf(sniffer->logfile,"\n\n***********************UDP Packet*************************\n");
print_ip_header(buf, size, sniffer);
fprintf(sniffer->logfile,"\nUDP Header\n");
fprintf(sniffer->logfile," |-Source Port : %d\n" , ntohs(udph->source));
fprintf(sniffer->logfile," |-Destination Port : %d\n" , ntohs(udph->dest));
fprintf(sniffer->logfile," |-UDP Length : %d\n" , ntohs(udph->len));
fprintf(sniffer->logfile," |-UDP Checksum : %d\n" , ntohs(udph->check));
fprintf(sniffer->logfile,"\n");
fprintf(sniffer->logfile,"IP Header\n");
PrintData(buf , iphdrlen, sniffer);
fprintf(sniffer->logfile,"UDP Header\n");
PrintData(buf+iphdrlen, sizeof(udph), sniffer);
fprintf(sniffer->logfile,"Data Payload\n");
PrintData(buf + iphdrlen + sizeof udph,
(size - sizeof udph - iph->ihl * 4),
sniffer);
fprintf(sniffer->logfile,"\n###########################################################");
}
void print_icmp_packet(unsigned char *buf , int size, t_sniffer *sniffer)
{
unsigned short iphdrlen;
struct iphdr *iph;
struct icmphdr *icmph;
iph = (struct iphdr *)buf;
iphdrlen = iph->ihl * 4;
icmph = (struct icmphdr *)(buf + iphdrlen);
fprintf(sniffer->logfile,"\n\n***********************ICMP Packet*************************\n");
print_ip_header(buf , size, sniffer);
fprintf(sniffer->logfile,"\n");
fprintf(sniffer->logfile,"ICMP Header\n");
fprintf(sniffer->logfile," |-Type : %d",(unsigned int)(icmph->type));
if((unsigned int)(icmph->type) == 11)
fprintf(sniffer->logfile," (TTL Expired)\n");
else if((unsigned int)(icmph->type) == ICMP_ECHOREPLY)
fprintf(sniffer->logfile," (ICMP Echo Reply)\n");
fprintf(sniffer->logfile," |-Code : %d\n",(unsigned int)(icmph->code));
fprintf(sniffer->logfile," |-Checksum : %d\n",ntohs(icmph->checksum));
fprintf(sniffer->logfile,"\n");
fprintf(sniffer->logfile,"IP Header\n");
PrintData(buf, iphdrlen, sniffer);
fprintf(sniffer->logfile,"UDP Header\n");
PrintData(buf + iphdrlen , sizeof(icmph), sniffer);
fprintf(sniffer->logfile,"Data Payload\n");
PrintData(buf + iphdrlen + sizeof(icmph),
(size - sizeof(icmph) - iph->ihl * 4),
sniffer);
fprintf(sniffer->logfile,"\n###########################################################");
}
void PrintData(unsigned char *buf, int size, t_sniffer *sniffer)
{
int i;
// int j;
for(i = 0 ; i < size ; i++)
{
if(i % 16 == 0)
fprintf(sniffer->logfile, "\n");
fprintf(sniffer->logfile, " %02X",(unsigned int)buf[i]);
if( i == size - 1)
{
fprintf(sniffer->logfile, "\n");
}
}
}