extern void host_mask(int, int *, int);
extern int host_name_lookup(void);
extern int host_nmtoa(int, int *, int, uschar *, int);
extern uschar *host_ntoa(int, const void *, uschar *, int *);
extern int host_scan_for_local_hosts(host_item *, host_item **, BOOL *);
extern void host_mask(int, int *, int);
extern int host_name_lookup(void);
extern int host_nmtoa(int, int *, int, uschar *, int);
extern uschar *host_ntoa(int, const void *, uschar *, int *);
extern int host_scan_for_local_hosts(host_item *, host_item **, BOOL *);