Multi tool use

Passing IP in string to htonl

I am binding to socket in a kernel module. I get the IP in string format from another socket. How should I pass this IP to htonl(). I tried typecasting it to (long int). But, obviously it won't work.

How to achieve this?

inet_addr()

2 Answers
2

unsigned int inet_addr(char *str)
{
int a, b, c, d;
char arr[4];
sscanf(str, "%d.%d.%d.%d", &a, &b, &c, &d);
arr[0] = a; arr[1] = b; arr[2] = c; arr[3] = d;
return *(unsigned int *)arr;
}

//use it as follows:
//inet_addr() returns address in Network Byte Order, so no need of htonl()

thesockaddr_in.sin_addr.s_addr = inet_addr(str);


Yo can use something like this:

const char *IP = "62.4.36.125";
SOCKADDR_IN DestAddr;

DestAddr.sin_family = AF_INET;
DestAddr.sin_port = htons (PORTNUM);
DestAddr.sin_addr.s_addr = inet_addr(IP);


By clicking "Post Your Answer", you acknowledge that you have read our updated terms of service, privacy policy and cookie policy, and that your continued use of the website is subject to these policies.