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dns.js
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import { Buffer } from 'buffer'
let errno2 = 0;
/**
* Gets/sets the "global" `errno`.
* @param {number} v
*/
const errno = function (v) {
if (v === undefined) return errno2;
errno2 = v;
};
/** No such file or directory */
const ENOENT = 2;
/** No such device */
const ENODEV = 19;
/** Is a directory */
const EISDIR = 21;
/** Invalid argument */
const EINVAL = 22;
/** File name too long */
const ENAMETOOLONG = 36;
/** Message too long */
const EMSGSIZE = 90;
function copy(src, target, targetStart, sourceStart, sourceEnd) {
while (sourceStart < sourceEnd) {
target[targetStart++] = src[sourceStart++];
}
};
class MessageHeader {
constructor() {
this.id = 0;
this.qr = 0;
this.opcode = 0;
this.aa = 0;
this.tc = 0;
this.rd = 0;
this.ra = 0;
this.z = 0;
this.ad = 0;
this.cd = 0;
this.rcode = 0;
this.qdcount = 0;
this.ancount = 0;
this.nscount = 0;
this.arcount = 0;
}
};
class MessageQuestion {
/**
*
* @param {string} name
* @param {ns_type_t} type
* @param {ns_class_t} klass
*/
constructor(name, type, klass) {
this.name = name;
this.type = type;
this.class = klass;
}
};
class MessageRR {
/**
*
* @param {string} name
* @param {ns_type_t} type
* @param {ns_class_t} klass
* @param {number} ttl
* @param {Array<*>} [rdata]
*/
constructor(name, type, klass, ttl, rdata = []) {
this.name = name;
this.type = type;
this.class = klass;
this.ttl = ttl;
this.rdata = rdata;
}
};
class Ptr {
constructor(val) {
this.p = val;
}
get() {
return this.p;
}
set(val) {
return this.p = val;
}
};
/** Default UDP Packet size */
const NS_PACKETSZ = 512;
/** Maximum domain name */
const NS_MAXDNAME = 1025;
/** Maximum message size */
const NS_MAXMSG = 65535;
/** Maximum compressed domain name */
const NS_MAXCDNAME = 255;
/** Maximum compressed domain label */
const NS_MAXLABEL = 63;
/** Bytes of fixed data in header */
const NS_HFIXEDSZ = 12;
/** Bytes of fixed data in query */
const NS_QFIXEDSZ = 4;
/** Bytes of fixed data in r record */
const NS_RRFIXEDSZ = 10;
/** Bytes of data in a u_int32_t */
const NS_INT32SZ = 4;
/** Bytes of data in a u_int16_t */
const NS_INT16SZ = 2;
/** Bytes of data in a u_int8_t */
const NS_INT8SZ = 1;
/** IPv4 T_A */
const NS_INADDRSZ = 4;
/** IPv6 T_AAAA */
const NS_IN6ADDRSZ = 16;
/** Flag bits indicating name compression. */
const NS_CMPRSFLGS = 0xc0;
/** For both UDP and TCP. */
const NS_DEFAULTPORT = 53;
/** Section constants */
const ns_sect = {
/** Query: Question. */ "qd": 0,
/** Update: Zone. */ "zn": 0,
/** Query: Answer. */ "an": 1,
/** Update: Prerequisites. */ "pr": 1,
/** Query: Name servers. */ "ns": 2,
/** Query: Update. */ "ud": 2,
/** Query|Update: Additional records. */ "ar": 3,
"max": 4,
};
/** Flag constants */
const ns_flag = {
/** Question/Response. */ "qr": 0,
/** Operation code. */ "opcode": 1,
/** Authoritative Answer. */ "aa": 2,
/** Truncation occured. */ "tc": 3,
/** Recursion Desired. */ "rd": 4,
/** Recursion Available. */ "ra": 5,
/** MBZ */ "z": 6,
/** Authentic Data (DNSSEC) */ "ad": 7,
/** Checking Disabled (DNSSEC) */ "cd": 8,
/** Response code. */ "rcode": 9,
"max": 10,
};
/** Currently defined opcodes. */
const ns_opcode = {
/** Standard query. */ "query": 0,
/** Inverse query (deprecated/unsupported). */ "iquery": 1,
/** Name server status query (unsupported). */ "status": 2,
// Opcode 3 is undefined/reserved
/** Zone change notification. */ "notify": 4,
/** Zone update message. */ "update": 5,
};
/** Currently defined response codes */
const ns_rcode = {
/** No error occured. */ "noerror": 0,
/** Format error. */ "formerr": 1,
/** Server failure. */ "servfail": 2,
/** Name error. */ "nxdomain": 3,
/** Unimplemented. */ "notimpl": 4,
/** Operation refused. */ "refused": 5,
// These are for BIND_UPDATE
/** Name exists */ "yxdomain": 6,
/** RRset exists */ "yxrrset": 7,
/** RRset does not exist */ "nxrrset": 8,
/** Not authoritative for zone */ "notauth": 9,
/** Zone of record different from zone section */ "notzone": 10,
"max": 11,
// The following are EDNS extended rcodes
"badvers": 16,
// The following are TSIG errors
"badsig": 16,
"badkey": 17,
"badtime": 18,
};
// BIND_UPDATE
const ns_update_operation = {
"delete": 0,
"add": 1,
"max": 2,
};
const NS_TSIG_FUDGE = 300;
const NS_TSIG_TCP_COUNT = 100;
const NS_TSIG_ALG_HMAC_MD5 = "HMAC-MD5.SIG-ALG.REG.INT";
const NS_TSIG_ERROR_NO_TSIG = -10,
NS_TSIG_ERROR_NO_SPACE = -11,
NS_TSIG_ERROR_FORMERR = -12,
/** @typedef {number} ns_type_t */
/**
* Currently defined type values for resources and queries.
* @enum {ns_type_t}
*/
ns_type = {
/** Cookie. */ "invalid": 0,
/** Host address. */ "a": 1,
/** Authoritative server. */ "ns": 2,
/** Mail destinaion. */ "md": 3,
/** Mail forwarder. */ "mf": 4,
/** Canonical name. */ "cname": 5,
/** Start of authority zone. */ "soa": 6,
/** Mailbox domain name. */ "mb": 7,
/** Mail group member. */ "mg": 8,
/** Mail rename name. */ "mr": 9,
/** Null resource record. */ "null": 10,
/** Well known service. */ "wks": 11,
/** Domain name pointer. */ "ptr": 12,
/** Host information. */ "hinfo": 13,
/** Mailbox information. */ "minfo": 14,
/** Mail routing information. */ "mx": 15,
/** Text strings. */ "txt": 16,
/** Responsible person. */ "rp": 17,
/** AFS cell database. */ "afsdb": 18,
/** X_25 calling address. */ "x25": 19,
/** ISDN calling address. */ "isdn": 20,
/** Router. */ "rt": 21,
/** NSAP address. */ "nsap": 22,
/** Reverse NSAP lookup (deprecated) */ "ns_nsap_ptr": 23,
/** Security signature. */ "sig": 24,
/** Security key. */ "key": 25,
/** X.400 mail mapping. */ "px": 26,
/** Geographical position (withdrawn). */ "gpos": 27,
/** Ip6 Address. */ "aaaa": 28,
/** Location Information. */ "loc": 29,
/** Next domain (security) */ "nxt": 30,
/** Endpoint identifier. */ "eid": 31,
/** Nimrod Locator. */ "nimloc": 32,
/** Server Selection. */ "srv": 33,
/** ATM Address */ "atma": 34,
/** Naming Authority PoinTeR */ "naptr": 35,
/** Key Exchange */ "kx": 36,
/** Certification Record */ "cert": 37,
/** IPv6 Address (deprecated, use ns_t.aaaa) */ "a6": 38,
/** Non-terminal DNAME (for IPv6) */ "dname": 39,
/** Kitchen sink (experimental) */ "sink": 40,
/** EDNS0 option (meta-RR) */ "opt": 41,
/** Address prefix list (RFC3123) */ "apl": 42,
/** Delegation Signer */ "ds": 43,
/** SSH Fingerprint */ "sshfp": 44,
/** IPSEC Key */ "ipseckey": 45,
/** RRSet Signature */ "rrsig": 46,
/** Negative Security */ "nsec": 47,
/** DNS Key */ "dnskey": 48,
/** Dynamic host configuartion identifier */ "dhcid": 49,
/** Negative security type 3 */ "nsec3": 50,
/** Negative security type 3 parameters */ "nsec3param": 51,
/** Host Identity Protocol */ "hip": 55,
/** Sender Policy Framework */ "spf": 99,
/** Transaction key */ "tkey": 249,
/** Transaction signature. */ "tsig": 250,
/** Incremental zone transfer. */ "ixfr": 251,
/** Transfer zone of authority. */ "axfr": 252,
/** Transfer mailbox records. */ "mailb": 253,
/** Transfer mail agent records. */ "maila": 254,
/** Wildcard match. */ "any": 255,
/** BIND-specific, nonstandard. */ "zxfr": 256,
/** DNSSEC look-aside validation. */ "dlv": 32769,
"max": 65536
};
/**
* Returns the type (string) for the `type` (number).
* This function is not fast. It could be made into an O(1) if needed.
* @param {number} type
* @return {string}
*/
const ns_type_str = function (type) {
const types = ns_type;
for (const str in types) if (types[str] === type) return str.toUpperCase();
};
/** @typedef {number} ns_class_t */
/**
* Values for class field
* @enum {ns_class_t}
*/
const ns_class = {
/** Cookie. */ "invalid": 0,
/** Internet. */ "in": 1,
/** unallocated/unsupported. */ "2": 2,
/** MIT Chaos-net. */ "chaos": 3,
/** MIT Hesoid. */ "hs": 4,
// Query class values which do not appear in resource records
/** for prereq. sections in update requests */ "none": 254,
/** Wildcard match. */ "any": 255,
"max": 65535,
};
// DNSSEC constants.
const ns_key_types = {
/** key type RSA/MD5 */ "rsa": 1,
/** Diffie Hellman */ "dh": 2,
/** Digital Signature Standard (MANDATORY) */ "dsa": 3,
/** Private key type starts with OID */ "private": 4
};
const ns_cert_types = {
/** PKIX (X.509v3) */ "pkix": 1,
/** SPKI */ "spki": 2,
/** PGP */ "pgp": 3,
/** URL private type */ "url": 253,
/** OID private type */ "oid": 254
};
// In libbind, this struct and the methods like ns_msg_getflag live in
// ns_parse.c.
const ns_flagdata = [
{mask: 0x8000, shift: 15}, // qr.
{mask: 0x7800, shift: 11}, // opcode.
{mask: 0x0400, shift: 10}, // aa.
{mask: 0x0200, shift: 9}, // tc.
{mask: 0x0100, shift: 8}, // rd.
{mask: 0x0080, shift: 7}, // ra.
{mask: 0x0040, shift: 6}, // z.
{mask: 0x0020, shift: 5}, // ad.
{mask: 0x0010, shift: 4}, // cd.
{mask: 0x000f, shift: 0}, // rcode.
{mask: 0x0000, shift: 0}, // expansion (1/6).
{mask: 0x0000, shift: 0}, // expansion (2/6).
{mask: 0x0000, shift: 0}, // expansion (3/6).
{mask: 0x0000, shift: 0}, // expansion (4/6).
{mask: 0x0000, shift: 0}, // expansion (5/6).
{mask: 0x0000, shift: 0}, // expansion (6/6).
];
/**
* 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.
*/
const ns_msg = class ns_msg {
constructor() {
this._buf = null; // not in original
this._msg = null;
this._eom = 0;
this._id = 0;
this._flags = 0;
this._counts = new Array(ns_sect.max);
this._sections = new Array(ns_sect.max);
this._sect = 0;
this._rrnum = 0;
this._msg_ptr = 0;
}
getId() {
return this._id;
}
getBase() {
return this._msg;
}
getSize() {
return this._eom;
}
getCount(section) {
return this._counts[section];
}
getFlag(flag) {
if (flag > 0 && flag < ns_flagdata.length)
return (this._flags & ns_flagdata[flag].mask) >> ns_flagdata[flag].shift;
return 0;
}
};
/**
* This is a newmsg handle, used when constructing new messages with
* ns_newmsg_init, et al.
*/
const ns_newmsg = class ns_newmsg {
constructor() {
this.msg = new ns_msg();
this.dnptrs = new Array(25);
this.lastdnptr = this.dnptrs.length;
}
setId(id) {
this.msg._id = id;
}
setFlag(flag, value) {
this.msg._flags &= ~ns_flagdata[flag].mask;
this.msg._flags |= value << ns_flagdata[flag].shift;
}
};
/**
* A parsed record, using uncompressed network binary names.
*/
const ns_rr2 = class ns_rr2 {
constructor() {
this.nname = Buffer.alloc(NS_MAXDNAME);
this.nnamel = 0;
this.type = 0;
this.rr_class = 0;
this.ttl = 0;
this.rdlength = 0;
this.rdata = null;
}
};
function dn_skipname(buf, ptr, eom) {
const saveptr = ptr;
const ptrptr = new Ptr(ptr);
if (ns_name_skip(buf, ptrptr, eom) === -1) {
return -1;
}
return ptrptr.get() - saveptr;
}
function ns_skiprr(buf, ptr, eom, section, count) {
const optr = ptr;
for (let i = 0; i < count; i++) {
let rdlength;
const b = dn_skipname(buf, ptr, eom);
if (b < 0) {
return -1;
}
ptr += b + NS_INT16SZ + NS_INT16SZ;
if (section !== ns_sect.qd) {
if (ptr + NS_INT32SZ + NS_INT16SZ > eom) return -1;
ptr += NS_INT32SZ;
rdlength = buf[ptr] * 256 + buf[ptr + 1];
ptr += NS_INT16SZ;
ptr += rdlength;
}
}
if (ptr > eom) {
errno(EMSGSIZE);
return -1;
}
return ptr - optr;
}
function ns_initparse(buf, buflen, handle) {
let msg = 0;
const eom = buflen;
let i;
handle._buf = buf;
handle._msg = 0;
handle._eom = eom;
if (msg + NS_INT16SZ > eom) return -1;
handle._id = buf[msg] * 256 + buf[msg + 1];
msg += NS_INT16SZ;
if (msg + NS_INT16SZ > eom) return -1;
handle._flags = buf[msg] * 256 + buf[msg + 1];
msg += NS_INT16SZ;
for (i = 0; i < ns_sect.max; i++) {
if (msg + NS_INT16SZ > eom) return -1;
handle._counts[i] = buf[msg] * 256 + buf[msg + 1];
msg += NS_INT16SZ;
}
for (i = 0; i < ns_sect.max; i++) {
if (handle._counts[i] === 0) {
handle._sections[i] = null;
} else {
const b = ns_skiprr(buf, msg, eom, i, handle._counts[i]);
if (b < 0) {
return -1;
}
handle._sections[i] = msg;
msg += b;
}
}
if (msg !== eom) return -1;
setsection(handle, ns_sect.max);
return 0;
}
function ns_parserr2(handle, section, rrnum, rr) {
let b;
const tmp = section;
if (tmp < 0 || section >= ns_sect.max) {
errno(ENODEV);
return -1;
}
if (section !== handle._sect) setsection(handle, section);
if (rrnum === -1) rrnum = handle._rrnum;
if (rrnum < 0 || rrnum >= handle._counts[section]) {
errno(ENODEV);
return -1;
}
if (rrnum < handle._rrnum) setsection(handle, section);
if (rrnum > handle._rrnum) {
b = ns_skiprr(handle._buf, handle._msg_ptr, handle._eom, section, rrnum - handle._rrnum);
if (b < 0) return -1;
handle._msg_ptr += b;
handle._rrnum = rrnum;
}
// do the parse
const nnamelp = new Ptr();
b = ns_name_unpack2(handle._buf, handle._msg_ptr, handle._eom, rr.nname, rr.nname.length, nnamelp);
if (b < 0) return -1;
rr.nnamel = nnamelp.get();
handle._msg_ptr += b;
if (handle._msg_ptr + NS_INT16SZ + NS_INT16SZ > handle._eom) {
errno(EMSGSIZE);
return -1;
}
rr.type = handle._buf[handle._msg_ptr] * 256 + handle._buf[handle._msg_ptr + 1];
handle._msg_ptr += NS_INT16SZ;
rr.rr_class = handle._buf[handle._msg_ptr] * 256 + handle._buf[handle._msg_ptr + 1];
handle._msg_ptr += NS_INT16SZ;
if (section === ns_sect.qd) {
rr.ttl = 0;
rr.rdlength = 0;
rr.rdata = null;
} else {
if (handle._msg_ptr + NS_INT32SZ + NS_INT16SZ > handle._eom) {
errno(EMSGSIZE);
return -1;
}
rr.ttl = handle._buf[handle._msg_ptr] * 16777216 +
handle._buf[handle._msg_ptr + 1] * 65536 +
handle._buf[handle._msg_ptr + 2] * 256 +
handle._buf[handle._msg_ptr + 3];
handle._msg_ptr += NS_INT32SZ;
rr.rdlength = handle._buf[handle._msg_ptr] * 256 + handle._buf[handle._msg_ptr + 1];
handle._msg_ptr += NS_INT16SZ;
if (handle._msg_ptr + rr.rdlength > handle._eom) {
errno(EMSGSIZE);
return -1;
}
rr.rdata = handle._msg_ptr;
handle._msg_ptr += rr.rdlength;
}
if (++handle._rrnum > handle._counts[section]) setsection(handle, section + 1);
// all done
return 0;
}
function setsection(msg, sect) {
msg._sect = sect;
if (sect === ns_sect.max) {
msg._rrnum = -1;
msg._msg_ptr = null;
} else {
msg._rrnum = 0;
msg._msg_ptr = msg._sections[sect];
}
}
const hexvalue = [
"00", "01", "02", "03", "04", "05", "06", "07", "08", "09", "0a", "0b", "0c", "0d", "0e", "0f",
"10", "11", "12", "13", "14", "15", "16", "17", "18", "19", "1a", "1b", "1c", "1d", "1e", "1f",
"20", "21", "22", "23", "24", "25", "26", "27", "28", "29", "2a", "2b", "2c", "2d", "2e", "2f",
"30", "31", "32", "33", "34", "35", "36", "37", "38", "39", "3a", "3b", "3c", "3d", "3e", "3f",
"40", "41", "42", "43", "44", "45", "46", "47", "48", "49", "4a", "4b", "4c", "4d", "4e", "4f",
"50", "51", "52", "53", "54", "55", "56", "57", "58", "59", "5a", "5b", "5c", "5d", "5e", "5f",
"60", "61", "62", "63", "64", "65", "66", "67", "68", "69", "6a", "6b", "6c", "6d", "6e", "6f",
"70", "71", "72", "73", "74", "75", "76", "77", "78", "79", "7a", "7b", "7c", "7d", "7e", "7f",
"80", "81", "82", "83", "84", "85", "86", "87", "88", "89", "8a", "8b", "8c", "8d", "8e", "8f",
"90", "91", "92", "93", "94", "95", "96", "97", "98", "99", "9a", "9b", "9c", "9d", "9e", "9f",
"a0", "a1", "a2", "a3", "a4", "a5", "a6", "a7", "a8", "a9", "aa", "ab", "ac", "ad", "ae", "af",
"b0", "b1", "b2", "b3", "b4", "b5", "b6", "b7", "b8", "b9", "ba", "bb", "bc", "bd", "be", "bf",
"c0", "c1", "c2", "c3", "c4", "c5", "c6", "c7", "c8", "c9", "ca", "cb", "cc", "cd", "ce", "cf",
"d0", "d1", "d2", "d3", "d4", "d5", "d6", "d7", "d8", "d9", "da", "db", "dc", "dd", "de", "df",
"e0", "e1", "e2", "e3", "e4", "e5", "e6", "e7", "e8", "e9", "ea", "eb", "ec", "ed", "ee", "ef",
"f0", "f1", "f2", "f3", "f4", "f5", "f6", "f7", "f8", "f9", "fa", "fb", "fc", "fd", "fe", "ff",
];
// Performance: these buffers are reused. They could be localized within name().
const _dname = Buffer.alloc(NS_MAXDNAME);
const _string = Buffer.alloc(NS_MAXDNAME);
// Likewise:
const _ptr = new Ptr();
class RDataParser {
constructor() {
this.msg = null;
this.eom = 0;
this.rdata = 0;
this.rdlen = 0;
/** @type {Array<*>} */
this.nrdata = null;
this.active = false;
}
initialize(msg, eom, rdata, rdlen, nrdata) {
this.msg = msg;
this.eom = eom;
this.rdata = rdata;
this.rdlen = rdlen;
this.nrdata = nrdata;
this.active = true;
}
finalize() {
this.active = false;
return this.rdlen === 0;
}
consume(n) {
if (this.active) {
if (this.rdlen < n) {
this.active = false;
} else {
this.rdata += n;
this.rdlen -= n;
}
}
return this.active;
}
IPv4() {
if (this.consume(4)) {
const {msg, rdata} = this;
const item = [
msg[rdata - 4],
msg[rdata - 3],
msg[rdata - 2],
msg[rdata - 1]
].join(".");
this.nrdata.push(item);
}
}
IPv6() {
if (this.consume(16)) {
const {msg, rdata} = this;
const item = [
hexvalue[msg[rdata - 16]] +
hexvalue[msg[rdata - 15]],
hexvalue[msg[rdata - 14]] +
hexvalue[msg[rdata - 13]],
hexvalue[msg[rdata - 12]] +
hexvalue[msg[rdata - 11]],
hexvalue[msg[rdata - 10]] +
hexvalue[msg[rdata - 9]],
hexvalue[msg[rdata - 8]] +
hexvalue[msg[rdata - 7]],
hexvalue[msg[rdata - 6]] +
hexvalue[msg[rdata - 5]],
hexvalue[msg[rdata - 4]] +
hexvalue[msg[rdata - 3]],
hexvalue[msg[rdata - 2]] +
hexvalue[msg[rdata - 1]]
].join(":");
this.nrdata.push(item);
}
}
name() {
let len, n;
if (this.active) {
if ((len = ns_name_unpack(this.msg, this.rdata, this.rdlen, _dname, _dname.length)) === -1) {
this.active = false;
return;
}
if ((n = ns_name_ntop(_dname, _string, _string.length)) === -1) {
this.active = false;
return;
}
const item = _string.toString("ascii", 0, n);
if (this.consume(len)) {
this.nrdata.push(item);
}
}
}
UInt32() {
if (this.consume(4)) {
const item = this.msg[this.rdata - 4] * 16777216 +
this.msg[this.rdata - 3] * 65536 +
this.msg[this.rdata - 2] * 256 +
this.msg[this.rdata - 1];
this.nrdata.push(item);
}
}
UInt16() {
if (this.consume(2)) {
const item = this.msg[this.rdata - 2] * 256 +
this.msg[this.rdata - 1];
this.nrdata.push(item);
}
}
UInt8() {
if (this.consume(1)) {
const item = this.msg[this.rdata - 1];
this.nrdata.push(item);
}
}
string(n) {
if (this.consume(n)) {
const item = this.msg.toString("ascii", this.rdata - n, this.rdata);
this.nrdata.push(item);
}
}
txt() {
if (this.active) {
let item = "";
if (this.rdlen > 0 && this.consume(1)) {
const n = this.msg[this.rdata - 1];
if (this.consume(n)) {
const tmp = this.msg.toString("ascii", this.rdata - n, this.rdata);
item += tmp;
} else {
this.active = false;
return;
}
}
this.nrdata.push(item);
}
}
rest() {
if (this.consume(this.rdlen)) {
const item = this.msg.slice(this.rdata - this.rdlen, this.rdata);
this.nrdata.push(item);
}
}
}
const _rdataParser = new RDataParser();
function ns_rdata_unpack(msg, eom, type, rdata, rdlen, nrdata) {
_rdataParser.initialize(msg, eom, rdata, rdlen, nrdata);
switch (type) {
case ns_type.a:
_rdataParser.IPv4();
break;
case ns_type.aaaa:
_rdataParser.IPv6();
break;
case ns_type.cname:
case ns_type.mb:
case ns_type.mg:
case ns_type.mr:
case ns_type.ns:
case ns_type.ptr:
case ns_type.dname:
_rdataParser.name();
break;
case ns_type.soa:
_rdataParser.name();
_rdataParser.name();
_rdataParser.UInt32();
_rdataParser.UInt32();
_rdataParser.UInt32();
_rdataParser.UInt32();
_rdataParser.UInt32();
break;
case ns_type.mx:
case ns_type.afsdb:
case ns_type.rt:
_rdataParser.UInt16();
_rdataParser.name();
break;
case ns_type.px:
_rdataParser.UInt16();
_rdataParser.name();
_rdataParser.name();
break;
case ns_type.srv:
_rdataParser.UInt16();
_rdataParser.UInt16();
_rdataParser.UInt16();
_rdataParser.name();
break;
case ns_type.minfo:
case ns_type.rp:
_rdataParser.name();
_rdataParser.name();
break;
case ns_type.txt:
_rdataParser.txt();
break;
default:
_rdataParser.rest();
}
if (_rdataParser.finalize() === false) {
errno(EMSGSIZE);
return -1;
}
return 0;
}
function RDataWriter() {
this.srdata = null;
this.buf = null;
this.ordata = 0;
this.rdata = 0;
this.rdsiz = 0;
this.nconsumed = 0;
this.nitem = 0;
this.active = false;
}
RDataWriter.prototype.initialize = function (srdata, buf, rdata, rdsiz) {
this.srdata = srdata;
this.buf = buf;
this.ordata = rdata;
this.rdata = rdata;
this.rdsiz = rdsiz;
this.nconsumed = 0;
this.nitem = 0;
this.active = true;
};
RDataWriter.prototype.consume = function (n) {
if (this.active) {
if (this.rdsiz < n) {
this.active = false;
} else {
this.rdata += n;
this.rdsiz -= n;
this.nconsumed += n;
}
}
return this.active;
};
RDataWriter.prototype.next = function () {
let item;
if (this.nitem < this.srdata.length) {
item = this.srdata[this.nitem++];
}
return item;
};
RDataWriter.prototype.IPv4 = function () {
let item = this.next();
if (this.consume(4)) {
if (typeof item === "string") {
item = item.split(".");
} else if (!Buffer.isBuffer(item) && !Array.isArray(item)) {
item = item.toString().split(".");
}
if (item.length < 4) {
this.active = false;
return;
}
this.buf[this.rdata - 4] = Number.parseInt(item[0], 10);
this.buf[this.rdata - 3] = Number.parseInt(item[1], 10);
this.buf[this.rdata - 2] = Number.parseInt(item[2], 10);
this.buf[this.rdata - 1] = Number.parseInt(item[3], 10);
}
};
RDataWriter.prototype.IPv6 = function () {
const item = this.next();
if (this.consume(16)) {
if (Buffer.isBuffer(item) || Array.isArray(item)) {
if (item.length < 16) {
this.active = false;
return;
}
this.buf[this.rdata - 16] = item[0];
this.buf[this.rdata - 15] = item[1];
this.buf[this.rdata - 14] = item[2];
this.buf[this.rdata - 13] = item[3];
this.buf[this.rdata - 12] = item[4];
this.buf[this.rdata - 11] = item[5];
this.buf[this.rdata - 10] = item[6];
this.buf[this.rdata - 9] = item[7];
this.buf[this.rdata - 8] = item[8];
this.buf[this.rdata - 7] = item[9];
this.buf[this.rdata - 6] = item[10];
this.buf[this.rdata - 5] = item[11];
this.buf[this.rdata - 3] = item[12];
this.buf[this.rdata - 2] = item[13];
this.buf[this.rdata - 1] = item[14];
this.buf[this.rdata - 1] = item[15];
} else {
const tmp = item.toString().split(":");
if (tmp.length < 8) {
this.active = false;
return;
}
for (let i = 0; i < 8; i++) {
const n = Number.parseInt(tmp[i], 16);
this.buf[this.rdata - 16 + i * 2] = n >> 8;
this.buf[this.rdata - 15 + i * 2] = n >> 0;
}
}
}
};
RDataWriter.prototype.name = function () {
const item = this.next();
let len, n;
if (this.active) {
if (Buffer.isBuffer(item)) {
len = item.length;
if (len + 1 > _string.length) {
this.active = false;
return;
}
copy(item, _string, 0, 0, len);
_string[len] = 0;
if (ns_name_pton2(_string, _dname, _dname.length, _ptr) === -1) {
this.active = false;
return;
}
n = _ptr.get();
if (this.consume(n)) {
copy(_dname, this.buf, this.rdata - n, 0, n);
}
}
if (typeof item === "string") {
if ((len = _string.write(item, 0)) === _string.length) {
this.active = false;
return;
}
_string[len] = 0;
if (ns_name_pton2(_string, _dname, _dname.length, _ptr) === -1) {
this.active = false;
return;
}
n = _ptr.get();
if (this.consume(n)) {
copy(_dname, this.buf, this.rdata - n, 0, n);
}
} else {
this.active = false;
return;
}
}
};
RDataWriter.prototype.UInt32 = function () {
let item = this.next();
if (this.consume(4)) {
if (Buffer.isBuffer(item) || Array.isArray(item)) {
if (item.length < 4) {
this.active = false;
return;
}
this.buf[this.rdata - 4] = item[0];
this.buf[this.rdata - 3] = item[1];
this.buf[this.rdata - 2] = item[2];
this.buf[this.rdata - 1] = item[3];
} else {
if (typeof item !== "number") {
item = Number.parseInt(item, 10);
}
this.buf[this.rdata - 4] = item >> 24;
this.buf[this.rdata - 3] = item >> 16;
this.buf[this.rdata - 2] = item >> 8;
this.buf[this.rdata - 1] = item >> 0;
}
}
};
RDataWriter.prototype.UInt16 = function () {
let item = this.next();
if (this.consume(2)) {
if (Buffer.isBuffer(item) || Array.isArray(item)) {
if (item.length < 2) {
this.active = false;
return;
}
this.buf[this.rdata - 2] = item[0];
this.buf[this.rdata - 1] = item[1];
} else {
if (typeof item !== "number") {
item = Number.parseInt(item, 10);
}
this.buf[this.rdata - 2] = item >> 8;
this.buf[this.rdata - 1] = item >> 0;
}
}
};
RDataWriter.prototype.UInt8 = function () {
let item = this.next();
if (this.consume(1)) {
if (Buffer.isBuffer(item) || Array.isArray(item)) {
if (item.length < 1) {
this.active = false;
return;
}
this.buf[this.rdata - 1] = item[0];
} else {
if (typeof item !== "number") {
item = Number.parseInt(item, 10);
}
this.buf[this.rdata - 1] = item;
}
}