[ale] Pulling IP address from server.

[Chris Fowler]

        // Open a socket to the kernel
        if((skfd = socket(AF_INET, SOCK_DGRAM, 0)) == -1)
        {
                free(tmp);
                return NULL;
        }

        // copy the iface name into the
        // interface structure
        strcpy(ifr.ifr_name, i);

        // Get the IP
        if(ioctl(skfd,SIOCGIFADDR, &ifr) == -1)
        {
                close(skfd);
                free(tmp);
                return NULL;
        }

        // Convert IP to string
        addr = ifr.ifr_addr;
        printIP(tmp, (struct sockaddr_in *)&addr);

On Mon, 2009-07-27 at 12:29 -0400, Brandon Checketts wrote:
> Atlanta Geek wrote:
> > What is the best way to identify the server's IP address from
> > ruby/perl/python/C.
> > I found a chunk of code parsing the results of ifconfig and I'm always
> > concerned when I see this type of thing.
> > 
> > Also does changing the default language of a server affect the output
> > of these commands at all.
> > 
> 
> Seems like it should be contained somewhere in /proc, but I'm unable to
> locate it there in a reliable way.  I can see it in reverse hex in some
> of the tables, but not in anything that authoritatively lists the IP
> addresses on a machine.
> 
> I looked through the output of 'strace ifconifg'  to see where ifconfig
> is getting it from, and it looks like it may come from
> /proc/net/if_inet6 or /proc/net/dev  or possibly /proc/net/unix.
> 
> Thanks,
> Brandon Checketts
> 
> 
> 
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