Hi All,
I was trying to create a function (for testing purpose) which displays the
header information for Ethernet, IP and TCP using a Linux machine. The problem
i am having is, whenever i read any packet from the saved pcap file, it
displays the IP header size (ip->ip_hl) is 5 (some times less than 5).
Part of the code is given below
static int pack_count=1; //Packet Count
struct ether_header *ethHeader; //Ethernet Header
struct ip *ipHeader; //IP Header
struct tcphdr *tcpHeader; //TCP Header
char *payload; //Payload
unsigned int size_ip; //Size of the IP Header
unsigned int size_tcp; //Size of the TCP Header
char protoname[20];
ethHeader=(struct ether_header*)packet;
ipHeader=(struct ip*)(packet+ETHER_SIZE);
size_ip=ipHeader->ip_hl;
printf("Packet Count is: %d \n",pack_count);
pack_count++;
printf("=================IP Header Details ============== \n");
printf("IP Header Length is: %d \n",ipHeader->ip_hl);
Please help me.
Regards,
Shameem
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