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How do I send a TCP/IP packet through a raw socket?

April 26, 2017IP packet raw send socket TCP

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How do I send a TCP/IP packet through a raw socket?

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Depending on what you want to send, you initially open a socket and give it its type. sockd = socket(AF_INET,SOCK_RAW,); You can choose from any protocol including IPPROTO_RAW. The protocol number goes into the IP header verbatim. IPPROTO_RAW places 0 in the IP header. Most systems have a socket option IP_HDRINCL which allows you to include your own IP header along with the rest of the packet. If your system doesn’t have this option, you may or may not be able to include your own IP header. If it is available, you should use it as such: char on = 1; setsockopt(sockd,IPPROTO_IP,IP_HDRINCL,&on,sizeof(on)); Of course, if you don’t want to include an IP header, you can always specify a protocol in the creation of the socket and slip your transport level header under it. You then build the packet and use a normal sendto().