diff options
Diffstat (limited to 'include/dnsjit/core/object/dns.lua')
| -rw-r--r-- | include/dnsjit/core/object/dns.lua | 797 |
1 files changed, 797 insertions, 0 deletions
diff --git a/include/dnsjit/core/object/dns.lua b/include/dnsjit/core/object/dns.lua new file mode 100644 index 0000000..e8fb12b --- /dev/null +++ b/include/dnsjit/core/object/dns.lua @@ -0,0 +1,797 @@ +-- Copyright (c) 2018-2021, OARC, Inc. +-- All rights reserved. +-- +-- This file is part of dnsjit. +-- +-- dnsjit is free software: you can redistribute it and/or modify +-- it under the terms of the GNU General Public License as published by +-- the Free Software Foundation, either version 3 of the License, or +-- (at your option) any later version. +-- +-- dnsjit is distributed in the hope that it will be useful, +-- but WITHOUT ANY WARRANTY; without even the implied warranty of +-- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +-- GNU General Public License for more details. +-- +-- You should have received a copy of the GNU General Public License +-- along with dnsjit. If not, see <http://www.gnu.org/licenses/>. + +-- dnsjit.core.object.dns +-- Container of a DNS message +-- .SS Parse DNS header and check if query or response +-- local dns = require("dnsjit.core.object.dns").new(payload) +-- if dns:parse_header() == 0 then +-- if dns.qr == 0 then +-- print(dns.id, dns.opcode_tostring(dns.opcode)) +-- else +-- print(dns.id, dns.rcode_tostring(dns.rcode)) +-- end +-- end +-- .SS Print a DNS payload +-- local dns = require("dnsjit.core.object.dns").new(payload) +-- dns:print() +-- .SS Parse a DNS payload +-- local dns = require("dnsjit.core.object.dns").new(payload) +-- local qs, q_labels, rrs, rr_labels = dns:parse() +-- if qs and q_labels then +-- ... +-- if rrs and rr_labels then +-- ... +-- end +-- end +-- +-- The object that describes a DNS message. +-- .SS Attributes +-- .TP +-- includes_dnslen +-- If non-zero then this indicates that the DNS length is included in the +-- payload (for example if the transport is TCP) and will affect parsing of it. +-- .TP +-- have_dnslen +-- Set if the dnslen was included in the payload and could be read. +-- .TP +-- have_id +-- Set if there is a DNS ID. +-- .TP +-- have_qr +-- Set if there is a QR flag. +-- .TP +-- have_opcode +-- Set if there is an OPCODE. +-- .TP +-- have_aa +-- Set if there is a AA flag. +-- .TP +-- have_tc +-- Set if there is a TC flag. +-- .TP +-- have_rd +-- Set if there is a RD flag. +-- .TP +-- have_ra +-- Set if there is a RA flag. +-- .TP +-- have_z +-- Set if there is a Z flag. +-- .TP +-- have_ad +-- Set if there is a AD flag. +-- .TP +-- have_cd +-- Set if there is a CD flag. +-- .TP +-- have_rcode +-- Set if there is a RCODE. +-- .TP +-- have_qdcount +-- Set if there is an QDCOUNT. +-- .TP +-- have_ancount +-- Set if there is an ANCOUNT. +-- .TP +-- have_nscount +-- Set if there is a NSCOUNT. +-- .TP +-- have_arcount +-- Set if there is an ARCOUNT. +-- .TP +-- dnslen +-- The DNS length found in the payload. +-- .TP +-- id +-- The DNS ID. +-- .TP +-- qr +-- The QR flag. +-- .TP +-- opcode +-- The OPCODE. +-- .TP +-- aa +-- The AA flag. +-- .TP +-- tc +-- The TC flag. +-- .TP +-- rd +-- The RD flag. +-- .TP +-- ra +-- The RA flag. +-- .TP +-- z +-- The Z flag. +-- .TP +-- ad +-- The AD flag. +-- .TP +-- cd +-- The CD flag. +-- .TP +-- rcode +-- The RCODE. +-- .TP +-- qdcount +-- The QDCOUNT. +-- .TP +-- ancount +-- The ANCOUNT. +-- .TP +-- nscount +-- The NSCOUNT. +-- .TP +-- arcount +-- The ARCOUNT. +-- .SS Constants +-- The following tables exists for DNS parameters, taken from +-- .I https://www.iana.org/assignments/dns-parameters/dns-parameters.xhtml +-- on the 2016-12-09. +-- .LP +-- .IR CLASS , +-- .IR CLASS_STR , +-- .IR TYPE , +-- .IR TYPE_STR , +-- .IR OPCODE , +-- .IR OPCODE_STR , +-- .IR RCODE , +-- .IR RCODE_STR , +-- .IR AFSDB , +-- .IR AFSDB_STR , +-- .IR DHCID , +-- .IR DHCID_STR , +-- .IR ENDS0 , +-- .IR ENDS0_STR +-- .LP +-- The +-- .I *_STR +-- tables can be used to get a textual representation of the numbers, see also +-- .IR class_tostring() , +-- .IR type_tostring() , +-- .IR opcode_tostring() , +-- .IR rcode_tostring() , +-- .IR afsdb_tostring() , +-- .I dhcid_tostring() +-- and +-- .IR edns0_tostring() . +module(...,package.seeall) + +require("dnsjit.core.object.dns_h") +local label = require("dnsjit.core.object.dns.label") +local Q = require("dnsjit.core.object.dns.q") +local RR = require("dnsjit.core.object.dns.rr") +local ffi = require("ffi") +local C = ffi.C + +local t_name = "core_object_dns_t" +local core_object_dns_t +local Dns = { + CLASS = { + IN = 1, + CH = 3, + HS = 4, + NONE = 254, + ANY = 255, + }, + TYPE = { + A = 1, + NS = 2, + MD = 3, + MF = 4, + CNAME = 5, + SOA = 6, + MB = 7, + MG = 8, + MR = 9, + NULL = 10, + WKS = 11, + PTR = 12, + HINFO = 13, + MINFO = 14, + MX = 15, + TXT = 16, + RP = 17, + AFSDB = 18, + X25 = 19, + ISDN = 20, + RT = 21, + NSAP = 22, + NSAP_PTR = 23, + SIG = 24, + KEY = 25, + PX = 26, + GPOS = 27, + AAAA = 28, + LOC = 29, + NXT = 30, + EID = 31, + NIMLOC = 32, + SRV = 33, + ATMA = 34, + NAPTR = 35, + KX = 36, + CERT = 37, + A6 = 38, + DNAME = 39, + SINK = 40, + OPT = 41, + APL = 42, + DS = 43, + SSHFP = 44, + IPSECKEY = 45, + RRSIG = 46, + NSEC = 47, + DNSKEY = 48, + DHCID = 49, + NSEC3 = 50, + NSEC3PARAM = 51, + TLSA = 52, + SMIMEA = 53, + HIP = 55, + NINFO = 56, + RKEY = 57, + TALINK = 58, + CDS = 59, + CDNSKEY = 60, + OPENPGPKEY = 61, + CSYNC = 62, + SPF = 99, + UINFO = 100, + UID = 101, + GID = 102, + UNSPEC = 103, + NID = 104, + L32 = 105, + L64 = 106, + LP = 107, + EUI48 = 108, + EUI64 = 109, + TKEY = 249, + TSIG = 250, + IXFR = 251, + AXFR = 252, + MAILB = 253, + MAILA = 254, + ANY = 255, + URI = 256, + CAA = 257, + AVC = 258, + TA = 32768, + DLV = 32769, + }, + OPCODE = { + QUERY = 0, + IQUERY = 1, + STATUS = 2, + NOTIFY = 4, + UPDATE = 5, + }, + RCODE = { + NOERROR = 0, + FORMERR = 1, + SERVFAIL = 2, + NXDOMAIN = 3, + NOTIMP = 4, + REFUSED = 5, + YXDOMAIN = 6, + YXRRSET = 7, + NXRRSET = 8, + NOTAUTH = 9, + NOTZONE = 10, + BADVERS = 16, + BADSIG = 16, + BADKEY = 17, + BADTIME = 18, + BADMODE = 19, + BADNAME = 20, + BADALG = 21, + BADTRUNC = 22, + BADCOOKIE = 23, + }, + AFSDB = { + SUBTYPE_AFS3LOCSRV = 1, + SUBTYPE_DCENCA_ROOT = 2, + }, + DHCID = { + TYPE_1OCTET = 0, + TYPE_DATAOCTET = 1, + TYPE_CLIENT_DUID = 2, + }, + EDNS0 = { + OPT_LLQ = 1, + OPT_UL = 2, + OPT_NSID = 3, + OPT_DAU = 5, + OPT_DHU = 6, + OPT_N3U = 7, + OPT_CLIENT_SUBNET = 8, + OPT_EXPIRE = 9, + OPT_COOKIE = 10, + OPT_TCP_KEEPALIVE = 11, + OPT_PADDING = 12, + OPT_CHAIN = 13, + OPT_DEVICEID = 26946, + }, +} +local _CLASS = {} +_CLASS[Dns.CLASS.IN] = "IN" +_CLASS[Dns.CLASS.CH] = "CH" +_CLASS[Dns.CLASS.HS] = "HS" +_CLASS[Dns.CLASS.NONE] = "NONE" +_CLASS[Dns.CLASS.ANY] = "ANY" +local _TYPE = {} +_TYPE[Dns.TYPE.A] = "A" +_TYPE[Dns.TYPE.NS] = "NS" +_TYPE[Dns.TYPE.MD] = "MD" +_TYPE[Dns.TYPE.MF] = "MF" +_TYPE[Dns.TYPE.CNAME] = "CNAME" +_TYPE[Dns.TYPE.SOA] = "SOA" +_TYPE[Dns.TYPE.MB] = "MB" +_TYPE[Dns.TYPE.MG] = "MG" +_TYPE[Dns.TYPE.MR] = "MR" +_TYPE[Dns.TYPE.NULL] = "NULL" +_TYPE[Dns.TYPE.WKS] = "WKS" +_TYPE[Dns.TYPE.PTR] = "PTR" +_TYPE[Dns.TYPE.HINFO] = "HINFO" +_TYPE[Dns.TYPE.MINFO] = "MINFO" +_TYPE[Dns.TYPE.MX] = "MX" +_TYPE[Dns.TYPE.TXT] = "TXT" +_TYPE[Dns.TYPE.RP] = "RP" +_TYPE[Dns.TYPE.AFSDB] = "AFSDB" +_TYPE[Dns.TYPE.X25] = "X25" +_TYPE[Dns.TYPE.ISDN] = "ISDN" +_TYPE[Dns.TYPE.RT] = "RT" +_TYPE[Dns.TYPE.NSAP] = "NSAP" +_TYPE[Dns.TYPE.NSAP_PTR] = "NSAP_PTR" +_TYPE[Dns.TYPE.SIG] = "SIG" +_TYPE[Dns.TYPE.KEY] = "KEY" +_TYPE[Dns.TYPE.PX] = "PX" +_TYPE[Dns.TYPE.GPOS] = "GPOS" +_TYPE[Dns.TYPE.AAAA] = "AAAA" +_TYPE[Dns.TYPE.LOC] = "LOC" +_TYPE[Dns.TYPE.NXT] = "NXT" +_TYPE[Dns.TYPE.EID] = "EID" +_TYPE[Dns.TYPE.NIMLOC] = "NIMLOC" +_TYPE[Dns.TYPE.SRV] = "SRV" +_TYPE[Dns.TYPE.ATMA] = "ATMA" +_TYPE[Dns.TYPE.NAPTR] = "NAPTR" +_TYPE[Dns.TYPE.KX] = "KX" +_TYPE[Dns.TYPE.CERT] = "CERT" +_TYPE[Dns.TYPE.A6] = "A6" +_TYPE[Dns.TYPE.DNAME] = "DNAME" +_TYPE[Dns.TYPE.SINK] = "SINK" +_TYPE[Dns.TYPE.OPT] = "OPT" +_TYPE[Dns.TYPE.APL] = "APL" +_TYPE[Dns.TYPE.DS] = "DS" +_TYPE[Dns.TYPE.SSHFP] = "SSHFP" +_TYPE[Dns.TYPE.IPSECKEY] = "IPSECKEY" +_TYPE[Dns.TYPE.RRSIG] = "RRSIG" +_TYPE[Dns.TYPE.NSEC] = "NSEC" +_TYPE[Dns.TYPE.DNSKEY] = "DNSKEY" +_TYPE[Dns.TYPE.DHCID] = "DHCID" +_TYPE[Dns.TYPE.NSEC3] = "NSEC3" +_TYPE[Dns.TYPE.NSEC3PARAM] = "NSEC3PARAM" +_TYPE[Dns.TYPE.TLSA] = "TLSA" +_TYPE[Dns.TYPE.SMIMEA] = "SMIMEA" +_TYPE[Dns.TYPE.HIP] = "HIP" +_TYPE[Dns.TYPE.NINFO] = "NINFO" +_TYPE[Dns.TYPE.RKEY] = "RKEY" +_TYPE[Dns.TYPE.TALINK] = "TALINK" +_TYPE[Dns.TYPE.CDS] = "CDS" +_TYPE[Dns.TYPE.CDNSKEY] = "CDNSKEY" +_TYPE[Dns.TYPE.OPENPGPKEY] = "OPENPGPKEY" +_TYPE[Dns.TYPE.CSYNC] = "CSYNC" +_TYPE[Dns.TYPE.SPF] = "SPF" +_TYPE[Dns.TYPE.UINFO] = "UINFO" +_TYPE[Dns.TYPE.UID] = "UID" +_TYPE[Dns.TYPE.GID] = "GID" +_TYPE[Dns.TYPE.UNSPEC] = "UNSPEC" +_TYPE[Dns.TYPE.NID] = "NID" +_TYPE[Dns.TYPE.L32] = "L32" +_TYPE[Dns.TYPE.L64] = "L64" +_TYPE[Dns.TYPE.LP] = "LP" +_TYPE[Dns.TYPE.EUI48] = "EUI48" +_TYPE[Dns.TYPE.EUI64] = "EUI64" +_TYPE[Dns.TYPE.TKEY] = "TKEY" +_TYPE[Dns.TYPE.TSIG] = "TSIG" +_TYPE[Dns.TYPE.IXFR] = "IXFR" +_TYPE[Dns.TYPE.AXFR] = "AXFR" +_TYPE[Dns.TYPE.MAILB] = "MAILB" +_TYPE[Dns.TYPE.MAILA] = "MAILA" +_TYPE[Dns.TYPE.ANY] = "ANY" +_TYPE[Dns.TYPE.URI] = "URI" +_TYPE[Dns.TYPE.CAA] = "CAA" +_TYPE[Dns.TYPE.AVC] = "AVC" +_TYPE[Dns.TYPE.TA] = "TA" +_TYPE[Dns.TYPE.DLV] = "DLV" +local _OPCODE = {} +_OPCODE[Dns.OPCODE.QUERY] = "QUERY" +_OPCODE[Dns.OPCODE.IQUERY] = "IQUERY" +_OPCODE[Dns.OPCODE.STATUS] = "STATUS" +_OPCODE[Dns.OPCODE.NOTIFY] = "NOTIFY" +_OPCODE[Dns.OPCODE.UPDATE] = "UPDATE" +local _RCODE = {} +_RCODE[Dns.RCODE.NOERROR] = "NOERROR" +_RCODE[Dns.RCODE.FORMERR] = "FORMERR" +_RCODE[Dns.RCODE.SERVFAIL] = "SERVFAIL" +_RCODE[Dns.RCODE.NXDOMAIN] = "NXDOMAIN" +_RCODE[Dns.RCODE.NOTIMP] = "NOTIMP" +_RCODE[Dns.RCODE.REFUSED] = "REFUSED" +_RCODE[Dns.RCODE.YXDOMAIN] = "YXDOMAIN" +_RCODE[Dns.RCODE.YXRRSET] = "YXRRSET" +_RCODE[Dns.RCODE.NXRRSET] = "NXRRSET" +_RCODE[Dns.RCODE.NOTAUTH] = "NOTAUTH" +_RCODE[Dns.RCODE.NOTZONE] = "NOTZONE" +_RCODE[Dns.RCODE.BADVERS] = "BADVERS" +_RCODE[Dns.RCODE.BADSIG] = "BADSIG" +_RCODE[Dns.RCODE.BADKEY] = "BADKEY" +_RCODE[Dns.RCODE.BADTIME] = "BADTIME" +_RCODE[Dns.RCODE.BADMODE] = "BADMODE" +_RCODE[Dns.RCODE.BADNAME] = "BADNAME" +_RCODE[Dns.RCODE.BADALG] = "BADALG" +_RCODE[Dns.RCODE.BADTRUNC] = "BADTRUNC" +_RCODE[Dns.RCODE.BADCOOKIE] = "BADCOOKIE" +local _AFSDB = {} +_AFSDB[Dns.AFSDB.SUBTYPE_AFS3LOCSRV] = "SUBTYPE_AFS3LOCSRV" +_AFSDB[Dns.AFSDB.SUBTYPE_DCENCA_ROOT] = "SUBTYPE_DCENCA_ROOT" +local _DHCID = {} +_DHCID[Dns.DHCID.TYPE_1OCTET] = "TYPE_1OCTET" +_DHCID[Dns.DHCID.TYPE_DATAOCTET] = "TYPE_DATAOCTET" +_DHCID[Dns.DHCID.TYPE_CLIENT_DUID] = "TYPE_CLIENT_DUID" +local _EDNS0 = {} +_EDNS0[Dns.EDNS0.OPT_LLQ] = "OPT_LLQ" +_EDNS0[Dns.EDNS0.OPT_UL] = "OPT_UL" +_EDNS0[Dns.EDNS0.OPT_NSID] = "OPT_NSID" +_EDNS0[Dns.EDNS0.OPT_DAU] = "OPT_DAU" +_EDNS0[Dns.EDNS0.OPT_DHU] = "OPT_DHU" +_EDNS0[Dns.EDNS0.OPT_N3U] = "OPT_N3U" +_EDNS0[Dns.EDNS0.OPT_CLIENT_SUBNET] = "OPT_CLIENT_SUBNET" +_EDNS0[Dns.EDNS0.OPT_EXPIRE] = "OPT_EXPIRE" +_EDNS0[Dns.EDNS0.OPT_COOKIE] = "OPT_COOKIE" +_EDNS0[Dns.EDNS0.OPT_TCP_KEEPALIVE] = "OPT_TCP_KEEPALIVE" +_EDNS0[Dns.EDNS0.OPT_PADDING] = "OPT_PADDING" +_EDNS0[Dns.EDNS0.OPT_CHAIN] = "OPT_CHAIN" +_EDNS0[Dns.EDNS0.OPT_DEVICEID] = "OPT_DEVICEID" +Dns.CLASS_STR = _CLASS +Dns.TYPE_STR = _TYPE +Dns.OPCODE_STR = _OPCODE +Dns.RCODE_STR = _RCODE +Dns.AFSDB_STR = _AFSDB +Dns.DHCID_STR = _DHCID +Dns.EDNS0_STR = _EDNS0 + +-- Create a new DNS object, optionally on-top of another object. +function Dns.new(obj) + local self = C.core_object_dns_new() + self.obj_prev = obj + ffi.gc(self, C.core_object_dns_free) + return self +end + +-- Return the textual type of the object. +function Dns:type() + return "dns" +end + +-- Return the previous object. +function Dns:prev() + return self.obj_prev +end + +-- Cast the object to the underlining object module and return it. +function Dns:cast() + return self +end + +-- Cast the object to the generic object module and return it. +function Dns:uncast() + return ffi.cast("core_object_t*", self) +end + +-- Make a copy of the object and return it. +function Dns:copy() + return C.core_object_dns_copy(self) +end + +-- Free the object, should only be used on copies or otherwise allocated. +function Dns:free() + C.core_object_dns_free(self) +end + +-- Return the Log object to control logging of this module. +function Dns:log() + return C.core_object_dns_log() +end + +-- Begin parsing the underlaying object, first the header is parsed then +-- optionally continue calling +-- .IR parse_q () +-- for the number of questions (see +-- .IR qdcount ). +-- After that continue calling +-- .IR parse_rr () +-- for the number of answers, authorities and additionals resource records +-- (see +-- .IR ancount ", " +-- .I nscount +-- and +-- .IR arcount ). +-- Returns 0 on success or negative integer on error which can be for +-- malformed or truncated DNS (-2) or if more space for labels is needed (-3). +function Dns:parse_header() + return C.core_object_dns_parse_header(self) +end + +-- Parse the next resource record as a question. +-- Returns 0 on success or negative integer on error which can be for +-- malformed or truncated DNS (-2) or if more space for labels is needed (-3). +function Dns:parse_q(q, labels, num_labels) + return C.core_object_dns_parse_q(self, q, labels, num_labels) +end + +-- Parse the next resource record. +-- Returns 0 on success or negative integer on error which can be for +-- malformed or truncated DNS (-2) or if more space for labels is needed (-3). +function Dns:parse_rr(rr, labels, num_labels) + return C.core_object_dns_parse_rr(self, rr, labels, num_labels) +end + +-- Begin parsing the underlaying object using +-- .IR parse_header "(), " +-- .IR parse_q () +-- and +-- .IR parse_rr (). +-- The optional +-- .I num_labels +-- can be used to set a specific number of labels used for each question +-- and resource record (default 16). +-- Returns result code, an array of questions, an array of question labels, +-- an array of resource records and an array of resource records labels. +-- Result code is 0 on success or negative integer on error which can be for +-- malformed or truncated DNS (-2) or if more space for labels is needed (-3). +function Dns:parse(num_labels) + local qs, qls, rrs, rrls = {}, {}, {}, {} + if num_labels == nil then + num_labels = 16 + end + + ret = self:parse_header() + if ret ~= 0 then + return ret, qs, qls, rrs, rrls + end + for n = 1, self.qdcount do + local labels = label.new(num_labels) + local q = Q.new() + local ret = C.core_object_dns_parse_q(self, q, labels, num_labels) + + if ret ~= 0 then + return ret, qs, qls, rrs, rrls + end + table.insert(qs, q) + table.insert(qls, labels) + end + for n = 1, self.ancount do + local labels = label.new(num_labels) + local rr = RR.new() + local ret = C.core_object_dns_parse_rr(self, rr, labels, num_labels) + + if ret ~= 0 then + return ret, qs, qls, rrs, rrls + end + table.insert(rrs, rr) + table.insert(rrls, labels) + end + for n = 1, self.nscount do + local labels = label.new(num_labels) + local rr = RR.new() + local ret = C.core_object_dns_parse_rr(self, rr, labels, num_labels) + + if ret ~= 0 then + return ret, qs, qls, rrs, rrls + end + table.insert(rrs, rr) + table.insert(rrls, labels) + end + for n = 1, self.arcount do + local labels = label.new(num_labels) + local rr = RR.new() + local ret = C.core_object_dns_parse_rr(self, rr, labels, num_labels) + + if ret ~= 0 then + return ret, qs, qls, rrs, rrls + end + table.insert(rrs, rr) + table.insert(rrls, labels) + end + + return 0, qs, qls, rrs, rrls +end + +-- Begin parsing the underlaying object using +-- .IR parse_header "(), " +-- .IR parse_q () +-- and +-- .IR parse_rr (), +-- and print it's content. +-- The optional +-- .I num_labels +-- can be used to set a specific number of labels used for each question +-- and resource record (default 16). +function Dns:print(num_labels) + if num_labels == nil then + num_labels = 16 + end + local labels = label.new(num_labels) + local q = Q.new() + local rr = RR.new() + + if self:parse_header() ~= 0 then + return + end + + local flags = {} + if self.have_aa and self.aa == 1 then + table.insert(flags, "AA") + end + if self.have_tc and self.tc == 1 then + table.insert(flags, "TC") + end + if self.have_rd and self.rd == 1 then + table.insert(flags, "RD") + end + if self.have_ra and self.ra == 1 then + table.insert(flags, "RA") + end + if self.have_z and self.z == 1 then + table.insert(flags, "Z") + end + if self.have_ad and self.ad == 1 then + table.insert(flags, "AD") + end + if self.have_cd and self.cd == 1 then + table.insert(flags, "CD") + end + + print("id:", self.id) + print("", "qr:", self.qr) + print("", "opcode:", Dns.opcode_tostring(self.opcode)) + print("", "flags:", table.concat(flags, " ")) + print("", "rcode:", Dns.rcode_tostring(self.rcode)) + print("", "qdcount:", self.qdcount) + print("", "ancount:", self.ancount) + print("", "nscount:", self.nscount) + print("", "arcount:", self.arcount) + + if self.qdcount > 0 then + print("questions:", "class", "type", "labels") + for n = 1, self.qdcount do + if C.core_object_dns_parse_q(self, q, labels, num_labels) ~= 0 then + return + end + print("", Dns.class_tostring(q.class), Dns.type_tostring(q.type), label.tooffstr(self, labels, num_labels)) + end + end + if self.ancount > 0 then + print("answers:", "class", "type", "ttl", "labels", "RR labels") + for n = 1, self.ancount do + if C.core_object_dns_parse_rr(self, rr, labels, num_labels) ~= 0 then + return + end + if rr.rdata_labels == 0 then + print("", Dns.class_tostring(rr.class), Dns.type_tostring(rr.type), rr.ttl, label.tooffstr(self, labels, rr.labels)) + else + print("", Dns.class_tostring(rr.class), Dns.type_tostring(rr.type), rr.ttl, label.tooffstr(self, labels, rr.labels), label.tooffstr(self, labels, rr.rdata_labels, rr.labels)) + end + end + end + if self.nscount > 0 then + print("authorities:", "class", "type", "ttl", "labels", "RR labels") + for n = 1, self.nscount do + if C.core_object_dns_parse_rr(self, rr, labels, num_labels) ~= 0 then + return + end + if rr.rdata_labels == 0 then + print("", Dns.class_tostring(rr.class), Dns.type_tostring(rr.type), rr.ttl, label.tooffstr(self, labels, rr.labels)) + else + print("", Dns.class_tostring(rr.class), Dns.type_tostring(rr.type), rr.ttl, label.tooffstr(self, labels, rr.labels), label.tooffstr(self, labels, rr.rdata_labels, rr.labels)) + end + end + end + if self.arcount > 0 then + print("additionals:", "class", "type", "ttl", "labels", "RR labels") + for n = 1, self.arcount do + if C.core_object_dns_parse_rr(self, rr, labels, num_labels) ~= 0 then + return + end + if rr.rdata_labels == 0 then + print("", Dns.class_tostring(rr.class), Dns.type_tostring(rr.type), rr.ttl, label.tooffstr(self, labels, rr.labels)) + else + print("", Dns.class_tostring(rr.class), Dns.type_tostring(rr.type), rr.ttl, label.tooffstr(self, labels, rr.labels), label.tooffstr(self, labels, rr.rdata_labels, rr.labels)) + end + end + end +end + +-- Return the textual name for a class. +function Dns.class_tostring(class) + if Dns.CLASS_STR[class] == nil then + return "UNKNOWN("..class..")" + end + return Dns.CLASS_STR[class] +end + +-- Return the textual name for a type. +function Dns.type_tostring(type) + if Dns.TYPE_STR[type] == nil then + return "UNKNOWN("..type..")" + end + return Dns.TYPE_STR[type] +end + +-- Return the textual name for an opcode. +function Dns.opcode_tostring(opcode) + if Dns.OPCODE_STR[opcode] == nil then + return "UNKNOWN("..opcode..")" + end + return Dns.OPCODE_STR[opcode] +end + +-- Return the textual name for a rcode. +function Dns.rcode_tostring(rcode) + if Dns.RCODE_STR[rcode] == nil then + return "UNKNOWN("..rcode..")" + end + return Dns.RCODE_STR[rcode] +end + +-- Return the textual name for an afsdb subtype. +function Dns.afsdb_tostring(afsdb) + if Dns.AFSDB_STR[afsdb] == nil then + return "UNKNOWN("..afsdb..")" + end + return Dns.AFSDB_STR[afsdb] +end + +-- Return the textual name for a dhcid type. +function Dns.dhcid_tostring(dhcid) + if Dns.DHCID_STR[dhcid] == nil then + return "UNKNOWN("..dhcid..")" + end + return Dns.DHCID_STR[dhcid] +end + +-- Return the textual name for an EDNS0 OPT record. +function Dns.edns0_tostring(edns0) + if Dns.EDNS0_STR[edns0] == nil then + return "UNKNOWN("..edns0..")" + end + return Dns.EDNS0_STR[edns0] +end + +core_object_dns_t = ffi.metatype(t_name, { __index = Dns }) + +-- dnsjit.core.object (3), +-- dnsjit.core.object.payload (3), +-- dnsjit.core.object.dns.label (3), +-- dnsjit.core.object.dns.q (3), +-- dnsjit.core.object.dns.rr (3) +return Dns |