ap_ get_remote_host — get client hostname or IP address
const char *ap_ get_remote_host(conn_rec *conn, void *dir_config, int type)
Returns the hostname or IP address (as a string) of the client.
dir_config is the
per_dir_config member of the current request or
NULL. type is one of the
following:
REMOTE_HOST
Returns the hostname or NULL (if it either
couldn’t be found or hostname lookups are disabled
with the HostnameLookups directive).
REMOTE_NAME
Returns the hostname or, if it can’t be found, returns the IP address.
REMOTE_NOLOOKUP
Similar to REMOTE_NAME, except that a DNS lookup
is not performed. (Note that the name can still be returned if a
previous call did do a DNS lookup.)
REMOTE_DOUBLE_REV
Does a double-reverse lookup (that is, look up the hostname from the
IP address, then look up the IP address from the name). If the double
reverse works and the IP addresses match, return the name; otherwise,
return a NULL.