if != inet_aton() then ?

**madcat23** · 04-25-2006

hi everyone..

i`m new to socket programming using C. i`ve made a client and been given the server code. what i would like to do is to accept and validate IP address..

now i`ve been following Beej's Guide and several other online resources and did search this forum.. almost all these guides suggest to use inet_ntoa() and inet_aton() .. the thing is i`m forced to use VC++ for my C assignment and the header files are not available in the VC IDE.

i would greatly appreciate it if anyone of you could tell me what header file i could use(with VC++ ofcourse) . or suggest any other alternative that would help me to validate an IP address.

thankyou very much for your time.

**OnionKnight** · 04-25-2006

Are you sure? For Windows you should include winsock.h.

Otherwise you could make a simple inet_aton using sscanf.

Code:

int inet_aton (char* addr, struct in_addr* dest)
{
	int a[4];
	if (sscanf(addr, "%d.%d.%d.%d", &a[0], &a[1], &a[2], &a[3]) != 4)
		return 0;
	dest->s_addr = a[3] | a[2]<<8 | a[1]<<16 | a[0]<<24;
	return 1;
}

This one will only allow addresses on the form x.x.x.x and there are lots of other flaws too but it should work as long as the input is correct.

**madcat23** · 04-27-2006

wow that sure works like a charm !! thankyou

i did more research about it .. and it seems winsock.h has inet_addr in place of inet_aton .. but inet_addr is a bit old and has a few issues .. like not accepting 255.255.255.255 ..

but winsock does have inet_ntoa() .. soo i`m sorted

thanks again OnionKnight ..

(jumping up and down)

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if != inet_aton() then ?