query.h

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#ifndef QUERY_H
#define QUERY_H
 
#include "dns.h"
#include "uint_t.h"
 
/* the following constants can be changed on own risk; defaults Y2018 with partial IPv6 support at provider */
 
#define QUERY_MAXLEVEL 5          /* search depth */
#define QUERY_MAXALIAS 16         /* glue depth */      
#define QUERY_MAXLOOP 100         /* queries per NS */  
#
#define QUERY_MAXUDP 400          /* used by dnscache */
#define QUERY_MAXTCP 40
#define KEY_LEN 32
 
/* byte patterns for well-known IP addresses and names in DNS messages */
 
#define IP6_LOOPBACK_ARPA \
"\0011\0010\0010\0010\0010\0010\0010\0010\0010\0010\0010\0010\0010\0010\0010\0010\0010\0010\0010\0010\0010\0010\0010\0010\0010\0010\0010\0010\0010\0010\0010\0010\003ip6\004arpa\0"
#define IP6_LOCALNET_ARPA \
"\0010\0010\0010\0010\0010\0010\0010\0010\0010\0010\0010\0010\0010\0010\0010\0010\0010\0010\0010\0010\0010\0010\0010\0010\0010\0010\0010\0010\0010\0010\0010\0010\003ip6\004arpa\0"
#define IP6_MULTICAST_ARPA \
"\0010\0010\0010\0010\0010\0010\0010\0010\0010\0010\0010\0010\0010\0010\0010\0010\0010\0010\0010\0010\0010\0010\0010\0010\0010\0010\0010\0010\0010\0010\001f\001f\003ip6\004arpa\0"
#define IP6_ALLNODESMULTICAST_ARPA \
"\0011\0010\0010\0010\0010\0010\0010\0010\0010\0010\0010\0010\0010\0010\0010\0010\0010\0010\0010\0010\0010\0010\0010\0010\0010\0010\0010\0010\0012\0010\001f\001f\003ip6\004arpa\0"
#define IP6_ALLROUTERSMULTICAST_ARPA \
"\0012\0010\0010\0010\0010\0010\0010\0010\0010\0010\0010\0010\0010\0010\0010\0010\0010\0010\0010\0010\0010\0010\0010\0010\0010\0010\0010\0010\0012\0010\001f\001f\003ip6\004arpa\0"
 
#define IP6_LOOPBACK_OCTAL \
"\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\001"
#define IP6_UNSPECIFIED_OCTAL \
"\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000"
#define IP6_MULTICASTPFX_OCTAL \
"\377\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000"
#define IP6_ALLNODES_OCTAL \
"\377\002\000\000\000\000\000\000\000\000\000\000\000\000\000\001"
#define IP6_ALLROUTERS_OCTAL \
"\377\002\000\000\000\000\000\000\000\000\000\000\000\000\000\002"
 
#define IP6_64PREFIX_OCTAL \
"\000\144\377\233\000\000\000\000\000\000\000\000"
 
#define IP4_LOCALHOST_ARPA \
"\0010\0010\0010\0010\7in-addr\4arpa\0"
#define IP4_LOOPBACK_ARPA \
"\0011\0010\0010\003127\7in-addr\4arpa\0"
 
#define IP4_LOOPBACK_OCTAL \
"\177\0\0\1"
#define IP4_LOCALHOST_OCTAL \
"\0\0\0\0"
 
// #define LOCALHOST IP4_LOOPBACK_OCTAL         /* RFC 2606: .localhost (sec 2) */
#define IP4_LOCALNET IP4_LOCALHOST_OCTAL
#define IP6_LOCALNET IP6_UNSPECIFIED_OCTAL
#define IP6_LOCALHOST IP6_LOOPBACK_OCTAL
#define IP6_LOCALHOST_ARPA IP6_LOOPBACK_ARPA
 
struct query {
  unsigned int loop;
  unsigned int level;                           /* query depth */ 
  char *name[QUERY_MAXLEVEL];                   /* query name */ 
  char *control[QUERY_MAXLEVEL];                /* pointing inside name; flagusetxtformat */
  char *ns[QUERY_MAXLEVEL][QUERY_MAXNS];        /* Name server's FQDN */
  char servers[QUERY_MAXLEVEL][QUERY_MAXIPLEN]; /* Array of 16 byte IPs, zeroed at start */
  char keys[QUERY_MAXLEVEL][QUERY_MAXNS * KEY_LEN]; /* a CNS has a 32 byte pubkey */
  int flagnskeys[QUERY_MAXLEVEL];               /* presence of keys */
  char ctx[QUERY_MAXLEVEL][QUERY_MAXNS];        /* XXX; query context */
  char *alias[QUERY_MAXALIAS];                  /* CNAME handling */
  uint32 aliasttl[QUERY_MAXALIAS];
  char ipv6[QUERY_MAXLEVEL];                    /* ipv4/ipv6 switch */
  char localip[16];                             /* source IP, unique */
  uint32 scope_id;                              /* source scope_id for LLU, unique */
  char type[2];                                 /* query type, unique */
  char class[2];                                /* query class, unique */ 
  uint32 byzg;                                  /* Byzantinian Generals param: reliability of answer */ 
  struct dns_transmit dt;                       /* transmission struct (dns.h) */
};
 
extern int query_start(struct query *,char *,char [2],char [2],char [16],uint32);
//                                  z,    dn,   type,    class, local ip, scope_id
extern int query_get(struct query *,iopause_fd *,struct taia *);
extern void query_io(struct query *,iopause_fd *,struct taia *);
 
extern void query_init(void);
extern void query_forwardonly(void);
 
#endif