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| #include <stdio.h>
#include <stdlib.h>
#include <winsock2.h>
#pragma comment(lib,"wpcap.lib")
#pragma comment(lib,"ws2_32.lib")
#define HAVE_REMOTE
#define WPCAP
#define PACKET_SIZE 65536
#include <pcap.h> // must be writing after the defines
/*
* Structures
*/
struct ethhdr // Ethernet header
{
unsigned char h_dest[6]; // Destination host address
unsigned char h_source[6]; // Source host address
unsigned short h_proto; // Packet type ID field (IP, ARP ...)
};
struct iphdr // structure IP Header
{
//Pour processeur de type little-endian
unsigned char ihl:4; // IP header length
unsigned char version:4;
unsigned char tos; // Type of service
unsigned short tot_len; // Total length
unsigned short id; // Identification
unsigned short frag_off; // Fragment Offset + Flags
unsigned char ttl; // Time to life
unsigned char protocol;
unsigned short check; // Checksum
unsigned int saddr; // Source address
unsigned int daddr; // Destination address
};
struct tcphdr // structure TCP Header
{
//Pour processeur de type little-endian
unsigned short source; // port source
unsigned short dest; // port de destination
unsigned int seq; // Sequence number
unsigned int ack_seq; // acknowledge sequence
unsigned short res1:4, // Reserved 1 : 4 bits
doff:4, // Data Offset
fin:1, // Flag FINISH
syn:1, // Flag SYNCHRONIZE
rst:1, // Flag RESET
psh:1, // Flag PUSH
ack:1, // Flag ACKNOLEDGE
urg:1, // Flag URGENT
res2:2; // Reserved 2 : 2 bits (res1 + res2 = 6 bits reserved)
unsigned short window;
unsigned short check; // checksum
unsigned short urg_ptr; // urgent
};
/*
* Functions
*/
void print_eth_header(struct ethhdr * eth){
fprintf(stdout,"-------------------[ETH HEADER]-----------\r\n");
fprintf(stdout,"| %.2X:%.2X:%.2X:%.2X:%.2X:%.2X -> ",eth->h_source[0],eth->h_source[1], eth->h_source[2],eth->h_source[3],eth->h_source[4],eth->h_source[5]);
fprintf(stdout,"%.2X:%.2X:%.2X:%.2X:%.2X:%.2X |\r\n",eth->h_dest[0],eth->h_dest[1], eth->h_dest[2],eth->h_dest[3],eth->h_dest[4],eth->h_dest[5]);
fprintf(stdout,"------------------------------------------\r\n");
fprintf(stdout,"Protocol: 0x%.4X\r\n", htons(eth->h_proto));
}
void print_ip_header(struct iphdr * ip){
unsigned char * src = (unsigned char *)&(ip->saddr);
unsigned char * dest = (unsigned char *)&(ip->daddr);
fprintf(stdout,"[ IP : %d.%d.%d.%d -> ",src[0],src[1],src[2],src[3]);
fprintf(stdout,"%d.%d.%d.%d ]\r\n",dest[0],dest[1],dest[2],dest[3]);
fprintf(stdout,"--------------------[IP HEADER]----------------------\r\n");
fprintf(stdout,"| IP header length : %d * 32 bits = %d bytes |\r\n",ip->ihl, ip->ihl * 4);
fprintf(stdout,"| IP version : %.5d | ",ip->version);
fprintf(stdout,"Type of service : %.5d |\r\n",ip->tos);
fprintf(stdout,"| Total length : %.5d | ",htons(ip->tot_len));
fprintf(stdout,"Identification : %.5d |\r\n",htons(ip->id));
fprintf(stdout,"| Time to live : %.5d | ",ip->ttl);
fprintf(stdout,"Protocol : %.5d |\r\n",ip->protocol);
fprintf(stdout,"| Checksum : %.5d |\r\n",ip->check);
fprintf(stdout,"-----------------------------------------------------\r\n");
}
void print_tcp_header(struct tcphdr * tcp){
fprintf(stdout,"[ Port : %.5d -> %.5d ]\n", ntohs(tcp->source), ntohs(tcp->dest) );
fprintf(stdout,"--------------------[TCP HEADER]---------------------\r\n");
fprintf(stdout,"| TCP Header length : %d * 32 bits = %d bytes |\r\n",tcp->doff, tcp->doff * 4);
fprintf(stdout,"| URG (URGENT) = %d | ",tcp->urg);
fprintf(stdout,"ACK (ACKNOWLEDGE) = %d |\r\n",tcp->ack);
fprintf(stdout,"| PSH (PUSH) = %d | ",tcp->psh);
fprintf(stdout,"RST (RESET) = %d |\r\n",tcp->rst);
fprintf(stdout,"| SYN (SYNCHRONIZE) = %d | ",tcp->syn);
fprintf(stdout,"FIN (FINISH) = %d |\r\n",tcp->fin);
fprintf(stdout,"-----------------------------------------------------\r\n");
}
void print_data(unsigned char * data, unsigned int size){
int j = 0, k = 0;
for( j = 0; j < size; j++)
{
if( k == 16)
{
j -= 16;
fprintf(stdout," ");
for(k = 0 ; k < 16 ; k++, j++)
{
if(data[j] < 127 && data[j] > 31)
fprintf(stdout, "%c", data[j]);
else
fprintf(stdout, ".");
}
j--;
k = 0;
fprintf(stdout,"\r\n");
}
else
{
fprintf(stdout,"%.2x ",data[j]);
k++;
}
}
j -= k;
while(k!=0)
{
if(data[j] < 127 && data[j] > 31)
fprintf(stdout, "%c", data[j]);
else
fprintf(stdout, ".");
k--;
j++;
}
fprintf(stdout,"\r\n");
}
void print_packet(const u_char * packetData){
struct iphdr * ip;
struct tcphdr * tcp;
ip = (struct iphdr *)(packetData+sizeof(struct ethhdr));
print_ip_header(ip);
switch(ip->protocol){
case 1 : printf("Internet Control Message Protocol (ICMP)\r\n");
break;
case 6 : printf("Transmission Control Protocol (TCP)\r\n");
tcp = (struct tcphdr *)(packetData+sizeof(struct ethhdr)+sizeof(struct iphdr));
print_tcp_header(tcp);
/* Data */
unsigned char * data = (unsigned char *)(packetData+sizeof(struct ethhdr)+sizeof(struct iphdr)+sizeof(struct tcphdr));
print_data(data, htons(ip->tot_len)-(ip->ihl * 4)-(tcp->doff * 4));
break;
case 17 : printf("User Datagram Protocol (UDP)\r\n");
break;
default : printf("Unknow\r\n");
break;
}
}
int main(void){
// Interfaces
pcap_if_t * alldevs;
pcap_if_t * d;
int ifNum;
int i=0;
pcap_t * captureHandle;
// Packet
struct pcap_pkthdr* packetHeader;
const u_char * packetData;
struct ethhdr * eth;
int res;
char errbuf[PCAP_ERRBUF_SIZE];
/* Retrieve the device list from the local machine */
if (pcap_findalldevs_ex(PCAP_SRC_IF_STRING, NULL, &alldevs, errbuf) == -1)
{
fprintf(stderr,"Error in pcap_findalldevs_ex: %s\r\n", errbuf);
return EXIT_FAILURE;
}
/* Print the list */
for(d= alldevs; d != NULL; d= d->next)
{
printf("%d.\r\nName:\r\n\t%s\r\n", ++i, d->name);
if (d->description)
printf("Descriptions:\r\n\t%s\r\n\r\n", d->description);
else
printf(" (No description available)\r\n");
}
if (i == 0)
{
printf("\r\nNo interfaces found! Make sure WinPcap is installed.\r\n");
return EXIT_FAILURE;
}else{
printf("Enter the interface number (1-%d):",i);
scanf("%d", &ifNum);
}
if(ifNum < 1 || ifNum > i)
{
printf("\nInterface number out of range.\r\n");
/* Free the device list */
pcap_freealldevs(alldevs);
return -1;
}
/* Jump to the selected adapter */
for(d=alldevs, i=0; i< ifNum-1 ;d=d->next, i++);
captureHandle = pcap_open(d->name, PACKET_SIZE, 0, 1000, NULL, errbuf);
if( captureHandle == NULL){
fprintf(stderr, "pcap_open(): %s\r\n", errbuf);
pcap_freealldevs(alldevs);
return EXIT_FAILURE;
}
/* We don't need any more the device list. Free it */
pcap_freealldevs(alldevs);
/* start the capture */
while( (res = pcap_next_ex(captureHandle, &packetHeader, &packetData)) >= 0){
if(res == 0)
/* Timeout elapsed */
continue;
printf("\r\n\r\nPacket length: %d\r\n", packetHeader->len);
printf("Received at ..... %s\r\n",ctime((const time_t*)&packetHeader->ts.tv_sec));
eth = (struct ethhdr *) packetData;
print_eth_header(eth);
// Analyse ethernet type
switch(htons(eth->h_proto)){
case 0x0800 : fprintf(stdout,"Internet Protocol, Version 4 (IPv4)\r\n");
print_packet(packetData);
break;
case 0x0806 : fprintf(stdout,"Address Resolution Protocol (ARP)\r\n");
break;
case 0x8035 : fprintf(stdout,"Reverse Address Resolution Protocol (RARP)\r\n");
break;
case 0x809B : fprintf(stdout,"AppleTalk (Ethertalk)\r\n");
break;
case 0x80F3 : fprintf(stdout,"AppleTalk Address Resolution Protocol (AARP)\r\n");
break;
case 0x8100 : fprintf(stdout,"IEEE 802.1Q-tagged frame\r\n");
break;
case 0x8137 : fprintf(stdout,"Novell IPX (alt)\r\n");
break;
case 0x8138 : fprintf(stdout,"Novell\r\n");
break;
case 0x86DD : fprintf(stdout,"Internet Protocol, Version 6 (IPv6)\r\n");
print_packet(packetData);
break;
case 0x8847 : fprintf(stdout,"MPLS unicast\r\n");
break;
case 0x8848 : fprintf(stdout,"MPLS multicast\r\n");
break;
case 0x8863 : fprintf(stdout,"PPPoE Discovery Stage\r\n");
break;
case 0x8864 : fprintf(stdout,"PPPoE Session Stage\r\n");
break;
case 0x88A2 : fprintf(stdout,"ATA over Ethernet\r\n");
break;
default : fprintf(stdout,"Unknow packet\r\n");
break;
}
}
if(res == -1){
printf("Error reading the packets: %s\r\n", pcap_geterr(captureHandle));
return EXIT_FAILURE;
}
pcap_close(captureHandle);
return EXIT_SUCCESS;
} |
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