int res_send(const char *, int, char *, int);
int dn_comp(unsigned char *, unsigned char *, int, unsigned char **, unsigned char *, unsigned char **);
int dn_expand(unsigned char *, unsigned char *, unsigned char *, unsigned char *, int);
int res_send(const char *, int, char *, int);
int dn_comp(unsigned char *, unsigned char *, int, unsigned char **, unsigned char *, unsigned char **);
int dn_expand(unsigned char *, unsigned char *, unsigned char *, unsigned char *, int);