bithapa / ping Goto Github PK

ICMP packet headers are parsed wrongly. Since SOCK_RAW is used, the result of recvfrom also includes IP headers. Therefore, ICMP headers begin after IP headers end – in your case, they start not at &pckt, but at &pckt + ip_headers_length point. You need to use iphdr struct, to parse them properly.

This line is entirely wrong:

type and code would be a part of IP headers and the number 69 has nothing to do with the ICMP protocol.