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gethostbyaddr question?
June 22, 2006 06:41 AM
I'm trying to resolve the IP address of a machine over LAN network I'm using ENet I do a call to enet_address_get_host() which in turn calls the function gethostbyaddr() the function call succeeds but instead of returning the ip address in the form "x.x.x.x" it returns "PC15.MyCompanyName.Corp" Is that a normal thing? and how i can get it in the form "x.x.x.x" thanks in advance
Storms .. Wind and Fire .. READ MY CALLS
1,596
June 22, 2006 08:04 AM
gethostbyaddr() returns one of the hosts corresponding to an inet_addr. PC15.MyCompanyName.Corp is a host while x.x.x.x is not.
However, x.x.x.x would be the string representation of an IPv4 inet_addr, as returned by inet_ntoa.
However, x.x.x.x would be the string representation of an IPv4 inet_addr, as returned by inet_ntoa.
June 22, 2006 09:19 AM
If you really want to resolve the address of a host (name), like you say, you probably want getaddrbyname() -- perhaps there's an ENet wrapper function (my guess would be something like enet_host_get_address()).
The function you're calling takes an already existing IP address, and turns that into a textual name of some sort.
If you already have the address, but want the x.y.z.w textual form, you can easily create that with sprintf() in a portable way, as inet_ntoa() only exists on Windows.
The function you're calling takes an already existing IP address, and turns that into a textual name of some sort.
If you already have the address, but want the x.y.z.w textual form, you can easily create that with sprintf() in a portable way, as inet_ntoa() only exists on Windows.
enum Bool { True, False, FileNotFound };
June 22, 2006 10:55 AM
You all right, but the actual problem is that i don't have the ip address number ( so i can operate inet_ntoa on it or convert it by myself ).
any way i've managed to get it the ip number - without calling any function out of ENet - and i am posting the code so others can make use of it:
Thanks
any way i've managed to get it the ip number - without calling any function out of ENet - and i am posting the code so others can make use of it:
unsigned int GetIPNumber(){ ENetAddress address; address.host = ENET_HOST_ANY; //ENET_HOST_ANY is equivlant to INADDR_ANY address.port = 1234; char buffer[128]; //enet_address_get_host() calls -> gethostbyaddr() //address[in], buffer[out] enet_address_get_host( &address, buffer, 128 ); //buffer now contains "PC15.MyCompanyName.Corp". //enet_address_set_host() calls -> gethostbyname() //address[out], buffer[in] enet_address_set_host( &address, buffer ); //address.host field now contains the ip address which is the number that i was looking for return address.host;}Thanks
Storms .. Wind and Fire .. READ MY CALLS
June 23, 2006 02:15 AM
What your code does is look up the local IP address of the local host. That's not terribly useful to the rest of the world, if your host is behind a NAT firewall. Check the Forum FAQ for the section on how to find your IP, and why that's a bad idea.
enum Bool { True, False, FileNotFound };
June 23, 2006 07:48 AM
Quote:
Original post by hplus0603
What your code does is look up the local IP address of the local host.
but that's what i wanted in first place =) sorry if i couldn't express my problem the right way...
i don't know what is NAT firewall! should i care for if my game will only run on a LAN?
Storms .. Wind and Fire .. READ MY CALLS
June 24, 2006 03:16 AM
If your game will only run on a LAN, you don't need to worry about NAT -- but then, you also don't need to worry about your local IP, because you can do server discovery using broadcast UDP.
enum Bool { True, False, FileNotFound };
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