CODEWITHSUNDEEP
cnetwork-programmingraw-sockets
Grey
Grey

Reputation: 1385

raw socket. ip header when to use hton

I am new to raw socket, and I am playing around with ip header. I noticed that ip->ip_hl = sizeof(struct ip) >> 2 //works fine; however ip->ip_hl = hton(sizeof(struct ip) >> 2) //will not work;

what i dont understand is that why not convert all the numbers to network order instead of host order in this case? what's the general rule to judge when to use network order/host order?

Thanks

Upvotes: 1

Views: 495

Answers (1)

Celada
Celada

Reputation: 22251

htons is for 16-bit values. htonl is for 32-bit values. As for hton (no suffix), I'm not even sure that exists.

The header length occupies only one byte (actually part of one byte). You don't need to flip any bytes to get it into the right form. Accordingly, there is no macro like htons or htonl for 8-bit values.

Upvotes: 1

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