Externalize dns parsing functions.

src/dnsmasq.h

@@ -934,6 +934,9 @@ int is_name_synthetic(int flags, char *name, struct all_addr *addr);
 int is_rev_synth(int flag, struct all_addr *addr, char *name);
 
 /* rfc1035.c */
+int extract_name(struct dns_header *header, size_t plen, unsigned char **pp, 
+                 char *name, int isExtract, int extrabytes);
+unsigned char *skip_questions(struct dns_header *header, size_t plen);
 unsigned int extract_request(struct dns_header *header, size_t qlen, 
 			       char *name, unsigned short *typep);
 size_t setup_reply(struct dns_header *header, size_t  qlen,
@@ -966,6 +969,9 @@ int in_arpa_name_2_addr(char *namein, struct all_addr *addrp);
 size_t answer_auth(struct dns_header *header, char *limit, size_t qlen, time_t now, union mysockaddr *peer_addr);
 #endif
 
+/* dnssec.c */
+int dnssec_validate(struct dns_header *header, size_t plen);
+
 /* util.c */
 void rand_init(void);
 unsigned short rand16(void);