-int res_mkquery(int, const char *, int, int, char *, int, struct rrec *, 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);
+int res_mkquery(int, const char *, int, int, const unsigned char *, int, const unsigned char*, unsigned char *, int);
+int res_send(const unsigned char *, int, unsigned char *, int);
+int dn_comp(const char *, unsigned char *, int, unsigned char **, unsigned char **);
+int dn_expand(const unsigned char *, const unsigned char *, const unsigned char *, char *, int);