The net_ip2host function transforms a textual IP address into a fully-qualified domain name and returns it.
This function works only if the DNS directive is enabled in the magnus.conf file. For more information, see Chapter 2, SAFs in the magnus.conf File.
char *net_ip2host(char *ip, int verify);
A new string containing the fully-qualified domain name if the transformation was accomplished, or NULL if the transformation was not accomplished.
char *ip is the IP address as a character string in dotted-decimal notation: nnn.nnn.nnn.nnn
int verify, if nonzero, specifies that the function should verify the fully-qualified domain name. Though this requires an extra query, you should use it when checking access control.