#ifndef DNS_H
#define DNS_H

#include "stralloc.h"
#include "iopause.h"
#include "taia.h"

#define DNS_C_IN "\0\1"
#define DNS_C_ANY "\0\377"

#define DNS_T_A "\0\1"
#define DNS_T_NS "\0\2"
#define DNS_T_CNAME "\0\5"
#define DNS_T_SOA "\0\6"
#define DNS_T_PTR "\0\14"
#define DNS_T_HINFO "\0\15"
#define DNS_T_MX "\0\17"
#define DNS_T_TXT "\0\20"
#define DNS_T_RP "\0\21"
#define DNS_T_SIG "\0\30"
#define DNS_T_KEY "\0\31"
#define DNS_T_AAAA "\0\34"
#define DNS_T_AXFR "\0\374"
#define DNS_T_ANY "\0\377"

struct dns_transmit {
  char *query; /* 0, or dynamically allocated */
  unsigned int querylen;
  char *packet; /* 0, or dynamically allocated */
  unsigned int packetlen;
  int s1; /* 0, or 1 + an open file descriptor */
  int tcpstate;
  unsigned int udploop;
  unsigned int curserver;
  struct taia deadline;
  unsigned int pos;
  char *servers;
  char localip[4];
  char qtype[2];
} ;

extern void dns_random_init(char *);
extern unsigned int dns_random(unsigned int);

extern void dns_sortip(char *,unsigned int);
extern void dns_sortip6(char *,unsigned int);

extern void dns_domain_free(char **);
extern int dns_domain_copy(char **,char *);
extern unsigned int dns_domain_length(const char *);
extern int dns_domain_equal(const char *,const char *);
extern char *dns_domain_suffix(const char *big,const char *little);
extern int dns_domain_fromdot(char **,const char *,unsigned int);
extern int dns_domain_todot_cat(stralloc *,const char *);

extern unsigned int dns_packet_copy(const char *,unsigned int,unsigned int,char *,unsigned int);
extern unsigned int dns_packet_getname(const char *,unsigned int,unsigned int,char **);
extern unsigned int dns_packet_skipname(const char *,unsigned int,unsigned int);
extern int dns_packet_nameequal(char *,unsigned int,unsigned int,char *,unsigned int,unsigned int);

extern int dns_transmit_start(struct dns_transmit *,char *,int,const char *,const char *,const char *);
extern void dns_transmit_free(struct dns_transmit *);
extern void dns_transmit_io(struct dns_transmit *,iopause_fd *,struct taia *);
extern int dns_transmit_get(struct dns_transmit *,iopause_fd *,struct taia *);

extern int dns_resolvconfip(char *);
extern int dns_resolve(const char *,const char *);
extern struct dns_transmit dns_resolve_tx;

extern int dns_ip4_packet(stralloc *,const char *,unsigned int);
extern int dns_ip4(stralloc *,stralloc *);
extern int dns_ip6_packet(stralloc *,const char *,unsigned int);
extern int dns_ip6(stralloc *,stralloc *);
extern int dns_ip6_4mapped(stralloc *,stralloc *);	/* dns_ip4 converted to
							   IPv4-mapped */
extern int dns_name_packet(stralloc *,const char *,unsigned int);

extern void dns_name4_domain(char *,const char *ip);
#define DNS_NAME4_DOMAIN 31
extern int dns_name6_domain(char *,const char *ip);
#define DNS_NAME6_DOMAIN (4*16+15)

extern int dns_name4(stralloc *,const char *ip);
extern int dns_name6(stralloc *,const char *ip);
extern int dns_txt_packet(stralloc *,const char *,unsigned int);
extern int dns_txt(stralloc *,stralloc *);
extern int dns_mx_packet(stralloc *,const char *,unsigned int);
extern int dns_mx(stralloc *,stralloc *);

extern int dns_resolvconfrewrite(stralloc *);
extern int dns_ip4_qualify_rules(stralloc *,stralloc *,stralloc *,stralloc *);
extern int dns_ip4_qualify(stralloc *,stralloc *,stralloc *);
extern int dns_ip6_qualify_rules(stralloc *,stralloc *,stralloc *,stralloc *);
extern int dns_ip6_qualify(stralloc *,stralloc *,stralloc *);
extern int dns_ip6_qualify_4mapped(stralloc *,stralloc *,stralloc *);

#endif