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resolv.h
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/* ported from glibc/resolv */
/*
* Define constants based on RFC 883, RFC 1034, RFC 1035
*/
#define NS_PACKETSZ 512 /*%< default UDP packet size */
#define NS_MAXDNAME 255 /*%< maximum domain name */
#define NS_MAXMSG 65535 /*%< maximum message size */
#define NS_MAXCDNAME 255 /*%< maximum compressed domain name */
#define NS_MAXLABEL 63 /*%< maximum length of domain label */
#define NS_HFIXEDSZ 12 /*%< #/bytes of fixed data in header */
#define NS_QFIXEDSZ 4 /*%< #/bytes of fixed data in query */
#define NS_RRFIXEDSZ 10 /*%< #/bytes of fixed data in r record */
#define NS_INT32SZ 4 /*%< #/bytes of data in a u_int32_t */
#define NS_INT16SZ 2 /*%< #/bytes of data in a u_int16_t */
#define NS_INT8SZ 1 /*%< #/bytes of data in a u_int8_t */
#define NS_INADDRSZ 4 /*%< IPv4 T_A */
#define NS_IN6ADDRSZ 16 /*%< IPv6 T_AAAA */
#define NS_CMPRSFLGS 0xc0 /*%< Flag bits indicating name compression. */
#define NS_DEFAULTPORT 53 /*%< For both TCP and UDP. */
#define SPRINTF(x) ((size_t)sprintf x)
#define NS_TYPE_ELT 0x40 /*%< EDNS0 extended label type */
#define DNS_LABELTYPE_BITSTRING 0x41
/* Accessor macros - this is part of the public interface. */
#define ns_msg_id(handle) ((handle)._id + 0)
#define ns_msg_base(handle) ((handle)._msg + 0)
#define ns_msg_end(handle) ((handle)._eom + 0)
#define ns_msg_size(handle) ((handle)._eom - (handle)._msg)
#define ns_msg_count(handle, section) ((handle)._counts[section] + 0)
/* Accessor macros - this is part of the public interface. */
#define ns_rr_name(rr) (((rr).name[0] != '\0') ? (rr).name : ".")
#define ns_rr_type(rr) ((ns_type)((rr).type + 0))
#define ns_rr_class(rr) ((ns_class)((rr).rr_class + 0))
#define ns_rr_ttl(rr) ((rr).ttl + 0)
#define ns_rr_rdlen(rr) ((rr).rdlength + 0)
#define ns_rr_rdata(rr) ((rr).rdata + 0)
#define INT32SZ NS_INT32SZ
#define INT16SZ NS_INT16SZ
# undef NS_GET16
# define NS_GET16(s, cp) \
do { \
const uint16_t *t_cp = (const uint16_t *) (cp); \
(s) = be16_to_cpu(*t_cp); \
(cp) += NS_INT16SZ; \
} while (0)
# undef NS_GET32
# define NS_GET32(l, cp) \
do { \
const uint32_t *t_cp = (const uint32_t *) (cp); \
(l) = be32_to_cpu(*t_cp); \
(cp) += NS_INT32SZ; \
} while (0)
/*
* These can be expanded with synonyms, just keep ns_parse.c:ns_parserecord()
* in synch with it.
*/
typedef enum __ns_sect {
ns_s_qd = 0, /*%< Query: Question. */
ns_s_zn = 0, /*%< Update: Zone. */
ns_s_an = 1, /*%< Query: Answer. */
ns_s_pr = 1, /*%< Update: Prerequisites. */
ns_s_ns = 2, /*%< Query: Name servers. */
ns_s_ud = 2, /*%< Update: Update. */
ns_s_ar = 3, /*%< Query|Update: Additional records. */
ns_s_max = 4
} ns_sect;
/*%
* This is a message handle. It is caller allocated and has no dynamic data.
* This structure is intended to be opaque to all but ns_parse.c, thus the
* leading _'s on the member names. Use the accessor functions, not the _'s.
*/
typedef struct __ns_msg {
const u_char *_msg, *_eom;
u_int16_t _id, _flags, _counts[ns_s_max];
const u_char *_sections[ns_s_max];
ns_sect _sect;
int _rrnum;
const u_char *_msg_ptr;
} ns_msg;
/*%
* This is a parsed record. It is caller allocated and has no dynamic data.
*/
typedef struct __ns_rr {
char name[NS_MAXDNAME];
u_int16_t type;
u_int16_t rr_class;
u_int32_t ttl;
u_int16_t rdlength;
const u_char * rdata;
} ns_rr;
/*%
* Currently defined type values for resources and queries.
*/
typedef enum __ns_type {
ns_t_invalid = 0, /*%< Cookie. */
ns_t_a = 1, /*%< Host address. */
ns_t_ns = 2, /*%< Authoritative server. */
ns_t_md = 3, /*%< Mail destination. */
ns_t_mf = 4, /*%< Mail forwarder. */
ns_t_cname = 5, /*%< Canonical name. */
ns_t_soa = 6, /*%< Start of authority zone. */
ns_t_mb = 7, /*%< Mailbox domain name. */
ns_t_mg = 8, /*%< Mail group member. */
ns_t_mr = 9, /*%< Mail rename name. */
ns_t_null = 10, /*%< Null resource record. */
ns_t_wks = 11, /*%< Well known service. */
ns_t_ptr = 12, /*%< Domain name pointer. */
ns_t_hinfo = 13, /*%< Host information. */
ns_t_minfo = 14, /*%< Mailbox information. */
ns_t_mx = 15, /*%< Mail routing information. */
ns_t_txt = 16, /*%< Text strings. */
ns_t_rp = 17, /*%< Responsible person. */
ns_t_afsdb = 18, /*%< AFS cell database. */
ns_t_x25 = 19, /*%< X_25 calling address. */
ns_t_isdn = 20, /*%< ISDN calling address. */
ns_t_rt = 21, /*%< Router. */
ns_t_nsap = 22, /*%< NSAP address. */
ns_t_nsap_ptr = 23, /*%< Reverse NSAP lookup (deprecated). */
ns_t_sig = 24, /*%< Security signature. */
ns_t_key = 25, /*%< Security key. */
ns_t_px = 26, /*%< X.400 mail mapping. */
ns_t_gpos = 27, /*%< Geographical position (withdrawn). */
ns_t_aaaa = 28, /*%< Ip6 Address. */
ns_t_loc = 29, /*%< Location Information. */
ns_t_nxt = 30, /*%< Next domain (security). */
ns_t_eid = 31, /*%< Endpoint identifier. */
ns_t_nimloc = 32, /*%< Nimrod Locator. */
ns_t_srv = 33, /*%< Server Selection. */
ns_t_atma = 34, /*%< ATM Address */
ns_t_naptr = 35, /*%< Naming Authority PoinTeR */
ns_t_kx = 36, /*%< Key Exchange */
ns_t_cert = 37, /*%< Certification record */
ns_t_a6 = 38, /*%< IPv6 address (deprecated, use ns_t_aaaa) */
ns_t_dname = 39, /*%< Non-terminal DNAME (for IPv6) */
ns_t_sink = 40, /*%< Kitchen sink (experimentatl) */
ns_t_opt = 41, /*%< EDNS0 option (meta-RR) */
ns_t_apl = 42, /*%< Address prefix list (RFC3123) */
ns_t_tkey = 249, /*%< Transaction key */
ns_t_tsig = 250, /*%< Transaction signature. */
ns_t_ixfr = 251, /*%< Incremental zone transfer. */
ns_t_axfr = 252, /*%< Transfer zone of authority. */
ns_t_mailb = 253, /*%< Transfer mailbox records. */
ns_t_maila = 254, /*%< Transfer mail agent records. */
ns_t_any = 255, /*%< Wildcard match. */
ns_t_zxfr = 256, /*%< BIND-specific, nonstandard. */
ns_t_max = 65536
} ns_type;
int
dn_expand(const u_char *msg, const u_char *eom, const u_char *src,
char *dst, int dstsiz);