Thread: Retrieve IPv4 from Struct hostent (gethostbyname)

Hello,
How can I retrieve the IPv4 address numbers-and-dots notation of a host?
For some reason, this example always prints 0.0.0.0. What am I missing?

Thanks in advance.

Code:

char* host="some host URL"
...
if(!(hostInfo = gethostbyname(host))){
	herror("error: gethostbyname"); exit(-1);
}
addrSrvr.sin_addr.s_addr = inet_aton(hostInfo->h_addr, &addrSrvr.sin_addr);
printf("IP address: %s\n", inet_ntoa(addrSrvr.sin_addr));

Can't you use intet_ntop() to get a string in the form you requested.

Originally Posted by MK27

I'm not sure what you are trying to do here:

Code:

addrSrvr.sin_addr.s_addr = inet_aton(hostInfo->h_addr, &addrSrvr.sin_addr);

This might be an issue since the address is already big endian.

Try:

Code:

	struct in_addr *addr = (struct in_addr*)hostInfo->h_addr;
	printf("%s\n", inet_ntoa(*addr));

Gethostbyname() is apparently depreciated, dunno why. Maybe the static return value, and ipv6 issues for some implementations.

Hmmmm...With this I get the correct IP. I guess I should have thought about your solution , thanks.