The net_ip2host function transforms a textual IP address into a fully qualified domain name and returns that name.
This function works only if the DNS directive is enabled in the obj.conf file. For more information, see Sun Java System Web Proxy Server 4.0.11 Configuration File Reference.
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. This parameter requires an extra query but you should use it when checking access control.