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dns.h
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dns.h
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/* common #include file for dns library.
*/
#ifndef DNS_PORT
#define DNS_PORT 53 /* default DNS port */
#define DNS_MAXPACKET 512 /* max size of UDP packet */
#define DNS_EDNS0_MAXPACKET 2048 /* max size of EDNS0 UDP packet */
#define DNS_MAXDN 255 /* max length of DN */
#define DNS_MAXLABEL 63 /* max length of one DN label */
#define DNS_MAXLABELS (DNS_MAXDN/2) /* max # of labels in a DN */
#define DNS_MAXDOMAIN 1024 /* max length of asciiz DN */
enum dns_class {
DNS_C_INVALID = 0, /* invalid class */
DNS_C_IN = 1, /* Internet */
DNS_C_CH = 3, /* CHAOS */
DNS_C_HS = 4, /* HESIOD */
DNS_C_ANY = 255 /* wildcard */
};
enum dns_type {
DNS_T_INVALID = 0, /* Cookie. */
DNS_T_A = 1, /* Host address. */
DNS_T_NS = 2, /* Authoritative server. */
DNS_T_MD = 3, /* Mail destination. */
DNS_T_MF = 4, /* Mail forwarder. */
DNS_T_CNAME = 5, /* Canonical name. */
DNS_T_SOA = 6, /* Start of authority zone. */
DNS_T_MB = 7, /* Mailbox domain name. */
DNS_T_MG = 8, /* Mail group member. */
DNS_T_MR = 9, /* Mail rename name. */
DNS_T_NULL = 10, /* Null resource record. */
DNS_T_WKS = 11, /* Well known service. */
DNS_T_PTR = 12, /* Domain name pointer. */
DNS_T_HINFO = 13, /* Host information. */
DNS_T_MINFO = 14, /* Mailbox information. */
DNS_T_MX = 15, /* Mail routing information. */
DNS_T_TXT = 16, /* Text strings. */
DNS_T_RP = 17, /* Responsible person. */
DNS_T_AFSDB = 18, /* AFS cell database. */
DNS_T_X25 = 19, /* X_25 calling address. */
DNS_T_ISDN = 20, /* ISDN calling address. */
DNS_T_RT = 21, /* Router. */
DNS_T_NSAP = 22, /* NSAP address. */
DNS_T_NSAP_PTR = 23, /* Reverse NSAP lookup (deprecated). */
DNS_T_SIG = 24, /* Security signature. */
DNS_T_KEY = 25, /* Security key. */
DNS_T_PX = 26, /* X.400 mail mapping. */
DNS_T_GPOS = 27, /* Geographical position (withdrawn). */
DNS_T_AAAA = 28, /* Ip6 Address. */
DNS_T_LOC = 29, /* Location Information. */
DNS_T_NXT = 30, /* Next domain (security). */
DNS_T_EID = 31, /* Endpoint identifier. */
DNS_T_NIMLOC = 32, /* Nimrod Locator. */
DNS_T_SRV = 33, /* Server Selection. */
DNS_T_ATMA = 34, /* ATM Address */
DNS_T_NAPTR = 35, /* Naming Authority PoinTeR */
DNS_T_KX = 36, /* Key Exchange */
DNS_T_CERT = 37, /* Certification record */
DNS_T_A6 = 38, /* IPv6 address (deprecates AAAA) */
DNS_T_DNAME = 39, /* Non-terminal DNAME (for IPv6) */
DNS_T_SINK = 40, /* Kitchen sink (experimentatl) */
DNS_T_OPT = 41, /* EDNS0 option (meta-RR) */
DNS_T_TSIG = 250, /* Transaction signature. */
DNS_T_IXFR = 251, /* Incremental zone transfer. */
DNS_T_AXFR = 252, /* Transfer zone of authority. */
DNS_T_MAILB = 253, /* Transfer mailbox records. */
DNS_T_MAILA = 254, /* Transfer mail agent records. */
DNS_T_ANY = 255, /* Wildcard match. */
DNS_T_ZXFR = 256, /* BIND-specific, nonstandard. */
DNS_T_MAX = 65536
};
enum dns_rcode { /* reply code */
DNS_R_NOERROR = 0, /* ok, no error */
DNS_R_FORMERR = 1, /* format error */
DNS_R_SERVFAIL = 2, /* server failed */
DNS_R_NXDOMAIN = 3, /* domain does not exists */
DNS_R_NOTIMPL = 4, /* not implemented */
DNS_R_REFUSED = 5, /* query refused */
/* these are for BIND_UPDATE */
DNS_R_YXDOMAIN = 6, /* Name exists */
DNS_R_YXRRSET = 7, /* RRset exists */
DNS_R_NXRRSET = 8, /* RRset does not exist */
DNS_R_NOTAUTH = 9, /* Not authoritative for zone */
DNS_R_NOTZONE = 10, /* Zone of record different from zone section */
/*ns_r_max = 11,*/
/* The following are TSIG extended errors */
DNS_R_BADSIG = 16,
DNS_R_BADKEY = 17,
DNS_R_BADTIME = 18
};
struct dns_nameval {
int val;
const char *name;
};
extern const struct dns_nameval dns_classtab[];
extern const struct dns_nameval dns_typetab[];
extern const struct dns_nameval dns_rcodetab[];
const struct dns_nameval *
dns_findname(const struct dns_nameval *nv, const char *name);
#define dns_findclassname(class) dns_findname(dns_classtab, (class))
#define dns_findtypename(type) dns_findname(dns_typetab, (type))
#define dns_findrcodename(rcode) dns_findname(dns_rcodetab, (rcode))
const char *dns_classname(enum dns_class class);
const char *dns_typename(enum dns_type type);
const char *dns_rcodename(enum dns_rcode rcode);
unsigned dns_ptodn(const char *name, unsigned char *dn, unsigned dnsiz);
/* convert asciiz string `name' to the DN format, return length or 0 */
unsigned dns_dntop(const unsigned char *dn, char *dst, unsigned dstsiz);
unsigned dns_dntol(const unsigned char *srcdn, unsigned char *dstdn);
#define dns_dnlc(c) ((c) >= 'A' && (c) <= 'Z' ? (c) - 'A' + 'a' : (c))
unsigned dns_dnlen(const unsigned char *dn);
unsigned dns_dnlabels(const unsigned char *dn);
/* return number of labels in a dn */
int dns_dnequ(const unsigned char *dn1, const unsigned char *dn2);
unsigned dns_dnreverse(const unsigned char *dn, unsigned char *rdn,
unsigned len);
/* reverse order of labels in a dn; len, if non-zero, should be length
* of dn (to save some CPU cycles) */
#endif