denser/internal.h at main · simta/denser · GitHub

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#ifndef DENSER_INTERNAL_H
#define DENSER_INTERNAL_H

#include "denser.h"

#ifdef __APPLE__
#define socklen_t int
#endif

/* OpCode ( RFC 6895 2.2 ) */
#define DNSR_OP_QUERY 0  /* Standard query */
#define DNSR_OP_IQUERY 1 /* Inverse query (OBSOLETE) */
#define DNSR_OP_STATUS 2 /* Server status request */
#define DNSR_OP_NOTIFY 4 /* Notification of zone change */
#define DNSR_OP_UPDATE 5 /* Dynamic DNS update */

/* RCODE ( RFC 6895 2.3 ) */
#define DNSR_RC_OK 0        /* No Error */
#define DNSR_RC_FORMERR 1   /* Format Error */
#define DNSR_RC_SERVFAIL 2  /* Server Failure */
#define DNSR_RC_NXDOMAIN 3  /* Non-Existent Domain */
#define DNSR_RC_NOTIMP 4    /* Not Implemented */
#define DNSR_RC_REFUSED 5   /* Query Refused */
#define DNSR_RC_YXDOMAIN 6  /* Name Exists when it should not */
#define DNSR_RC_YXRRSET 7   /* RR Set Exists when it should not */
#define DNSR_RC_NXRRSET 8   /* RR Set that should exist does not */
#define DNSR_RC_NOTAUTH 9   /* Not Authoritative / Not Authorized */
#define DNSR_RC_NOTZONE 10  /* Name not contained in zone */
#define DNSR_RC_BADVERS 16  /* Bad OPT version */
#define DNSR_RC_BADSIG 16   /* duplicate assignment in RFC 2845 */
#define DNSR_RC_BADKEY 17   /* Key not recognized */
#define DNSR_RC_BADTIME 18  /* Signature out of time window */
#define DNSR_RC_BADMODE 19  /* Bad TKEY Mode */
#define DNSR_RC_BADNAME 20  /* Duplicate key name */
#define DNSR_RC_BADALG 21   /* Algorithm not supported */
#define DNSR_RC_BADTRUNC 22 /* Bad Truncation */

#define DNSR_EDNS_UNKNOWN -1
#define DNSR_EDNS_BAD -2
#define DNSR_EDNS_VERSION 0

#define DNSR_EDNS_OPT_NSID 3   /* RFC 5001 DNS Name Server Identifier */
#define DNSR_EDNS_OPT_DAU 5    /* RFC 6975 DNSSEC Algorithm Understood */
#define DNSR_EDNS_OPT_DHU 6    /* RFC 6975 DS Hash Understood */
#define DNSR_EDNS_OPT_N3U 7    /* RFC 6975 NSEC3 Hash Understood */
#define DNSR_EDNS_OPT_ECS 8    /* draft-vandergaast-edns-client-subnet */
#define DNSR_EDNS_OPT_EXPIRE 9 /* RFC 7314 EXPIRE */

#define DNSR_DEFAULT_PORT "53"

/* DNSR bit masks */
#define DNSR_RESPONSE 0x8000
#define DNSR_RECURSION_DESIRED 0x0100
#define DNSR_TRUNCATION 0x0200
#define DNSR_RECURSION_AVAILABLE 0x0080
#define DNSR_RCODE 0x000f
#define DNSR_AUTHORITATIVE_ANSWER 0x0400
#define DNSR_OPCODE 0x7800
#define DNSR_Z 0x0070
#define DNSR_OFFSET 0xc000
#define DNSR_EXTENDED_LABEL 0x4000

#ifdef sun
#define MIN(a, b) ((a) < (b) ? (a) : (b))
#define MAX(a, b) ((a) > (b) ? (a) : (b))
#endif /* sun */

#ifdef EBUG
#define DEBUG(x) x
#else
#define DEBUG(x)
#endif

struct nsinfo {
    struct sockaddr_storage ns_sa;
    uint16_t                ns_id;
    uint16_t                ns_udp;
    int                     ns_asked;
    int                     ns_edns;
};

struct dnsr {
    uint16_t       d_id;
    uint16_t       d_flags;
    char           d_dn[ DNSR_MAX_NAME + 1 ];
    char           d_query[ DNSR_MAX_UDP ];
    size_t         d_questionlen;
    size_t         d_querylen;
    int            d_querysent;
    int            d_state;
    int            d_errno;
    struct nsinfo  d_nsinfo[ DNSR_MAX_NS ];
    int            d_nscount;
    int            d_nsresp;
    int            d_fd;
    int            d_fd6;
    struct timeval d_querytime;
};

struct dnsr_header {
    uint16_t h_id;
    uint16_t h_flags;
    uint16_t h_qdcount;
    uint16_t h_ancount;
    uint16_t h_nscount;
    uint16_t h_arcount;
};

struct dnsr_result *dnsr_create_result(DNSR *, char *, int);
int                 dnsr_display_header(struct dnsr_header *h);
void                dnsr_free_ip_info(struct ip_info *);
void                dnsr_free_dnsr_string(struct dnsr_string *);
int                 dnsr_labels_to_name(
                        DNSR *, char *, char **, unsigned int, char *, char **, char *);
int dnsr_labels_to_string(DNSR *, char **, char *, char *);
int dnsr_match_additional(DNSR *, struct dnsr_result *);
int dnsr_match_ip(DNSR *, struct dnsr_rr *, struct dnsr_rr *);
int dnsr_parse_rr(
        DNSR *, struct dnsr_rr *, struct dnsr_result *, char *, char **, int);
char *dnsr_send_query_tcp(DNSR *, int, int *);
int   dnsr_validate_resp(DNSR *, char *, struct sockaddr *);
int   dnsr_validate_result(DNSR *, struct dnsr_result *);

#endif /* DENSER_INTERNAL_H */