{ "contractName": "RRUtils", "abi": [], "metadata": "{\"compiler\":{\"version\":\"0.7.4+commit.3f05b770\"},\"language\":\"Solidity\",\"output\":{\"abi\":[],\"devdoc\":{\"details\":\"RRUtils is a library that provides utilities for parsing DNS resource records.\",\"kind\":\"dev\",\"methods\":{},\"version\":1},\"userdoc\":{\"kind\":\"user\",\"methods\":{},\"version\":1}},\"settings\":{\"compilationTarget\":{\"@ensdomains/dnssec-oracle/contracts/RRUtils.sol\":\"RRUtils\"},\"evmVersion\":\"istanbul\",\"libraries\":{},\"metadata\":{\"bytecodeHash\":\"ipfs\"},\"optimizer\":{\"enabled\":false,\"runs\":200},\"remappings\":[]},\"sources\":{\"@ensdomains/buffer/contracts/Buffer.sol\":{\"keccak256\":\"0xa9ac824902ab6aaf6883432cd6f2a853186fcce568d63d04fa8143df6c5d6ebd\",\"urls\":[\"bzz-raw://99a06f0895b90759b92067c86b0eba1823bb6180ef4f3e3ed18abef2ec43eab9\",\"dweb:/ipfs/QmQVmiDPkuXZq94G6Mc3TChVrYzvEk3gbGLVoJrVKKf4uz\"]},\"@ensdomains/dnssec-oracle/contracts/BytesUtils.sol\":{\"keccak256\":\"0x17b0123a981825ac9445ec82c8e20288321b27139518ba1f81c4cbd06f1312ab\",\"urls\":[\"bzz-raw://fe03e00240c645751873f38f56cc3db12d19a82538a0f0e9648ccfc23e8a715d\",\"dweb:/ipfs/QmbT7Q7GUgkZFY5gA4RxhWg3anPKiH9EZoM6HWBKDkK7dp\"]},\"@ensdomains/dnssec-oracle/contracts/RRUtils.sol\":{\"keccak256\":\"0x52cca336743e65b57ce01a30bbc7ed8523758853ab7d35db57a6f40d4a3bf892\",\"urls\":[\"bzz-raw://feb1f75afcea14258289d466c9bfcb4cf648858791ff1780b5d3a4191e4158e2\",\"dweb:/ipfs/QmTc4vx6sEx9jW3Efu1QAFQQ7JTarfMDYwgv4FzZoxTWUx\"]}},\"version\":1}", "bytecode": "0x60566023600b82828239805160001a607314601657fe5b30600052607381538281f3fe73000000000000000000000000000000000000000030146080604052600080fdfea2646970667358221220f5a1ebd34c31680fa4b5fd9611c94299ca39238fce851497e1d430295ed55bcc64736f6c63430007040033", "deployedBytecode": "0x73000000000000000000000000000000000000000030146080604052600080fdfea2646970667358221220f5a1ebd34c31680fa4b5fd9611c94299ca39238fce851497e1d430295ed55bcc64736f6c63430007040033", "immutableReferences": {}, "generatedSources": [], "deployedGeneratedSources": [], "sourceMap": "196:11103:9:-:0;;;;;;;;;;;;;;;;;;;;;;;;;", "deployedSourceMap": "196:11103:9:-:0;;;;;;;;", "source": "pragma solidity ^0.7.4;\n\nimport \"./BytesUtils.sol\";\nimport \"@ensdomains/buffer/contracts/Buffer.sol\";\n\n/**\n* @dev RRUtils is a library that provides utilities for parsing DNS resource records.\n*/\nlibrary RRUtils {\n using BytesUtils for *;\n using Buffer for *;\n\n /**\n * @dev Returns the number of bytes in the DNS name at 'offset' in 'self'.\n * @param self The byte array to read a name from.\n * @param offset The offset to start reading at.\n * @return The length of the DNS name at 'offset', in bytes.\n */\n function nameLength(bytes memory self, uint offset) internal pure returns(uint) {\n uint idx = offset;\n while (true) {\n assert(idx < self.length);\n uint labelLen = self.readUint8(idx);\n idx += labelLen + 1;\n if (labelLen == 0) {\n break;\n }\n }\n return idx - offset;\n }\n\n /**\n * @dev Returns a DNS format name at the specified offset of self.\n * @param self The byte array to read a name from.\n * @param offset The offset to start reading at.\n * @return ret The name.\n */\n function readName(bytes memory self, uint offset) internal pure returns(bytes memory ret) {\n uint len = nameLength(self, offset);\n return self.substring(offset, len);\n }\n\n /**\n * @dev Returns the number of labels in the DNS name at 'offset' in 'self'.\n * @param self The byte array to read a name from.\n * @param offset The offset to start reading at.\n * @return The number of labels in the DNS name at 'offset', in bytes.\n */\n function labelCount(bytes memory self, uint offset) internal pure returns(uint) {\n uint count = 0;\n while (true) {\n assert(offset < self.length);\n uint labelLen = self.readUint8(offset);\n offset += labelLen + 1;\n if (labelLen == 0) {\n break;\n }\n count += 1;\n }\n return count;\n }\n\n uint constant RRSIG_TYPE = 0;\n uint constant RRSIG_ALGORITHM = 2;\n uint constant RRSIG_LABELS = 3;\n uint constant RRSIG_TTL = 4;\n uint constant RRSIG_EXPIRATION = 8;\n uint constant RRSIG_INCEPTION = 12;\n uint constant RRSIG_KEY_TAG = 16;\n uint constant RRSIG_SIGNER_NAME = 18;\n\n struct SignedSet {\n uint16 typeCovered;\n uint8 algorithm;\n uint8 labels;\n uint32 ttl;\n uint32 expiration;\n uint32 inception;\n uint16 keytag;\n bytes signerName;\n bytes data;\n bytes name;\n }\n\n function readSignedSet(bytes memory data) internal pure returns(SignedSet memory self) {\n self.typeCovered = data.readUint16(RRSIG_TYPE);\n self.algorithm = data.readUint8(RRSIG_ALGORITHM);\n self.labels = data.readUint8(RRSIG_LABELS);\n self.ttl = data.readUint32(RRSIG_TTL);\n self.expiration = data.readUint32(RRSIG_EXPIRATION);\n self.inception = data.readUint32(RRSIG_INCEPTION);\n self.keytag = data.readUint16(RRSIG_KEY_TAG);\n self.signerName = readName(data, RRSIG_SIGNER_NAME);\n self.data = data.substring(RRSIG_SIGNER_NAME + self.signerName.length, data.length - RRSIG_SIGNER_NAME - self.signerName.length);\n }\n\n function rrs(SignedSet memory rrset) internal pure returns(RRIterator memory) {\n return iterateRRs(rrset.data, 0);\n }\n\n /**\n * @dev An iterator over resource records.\n */\n struct RRIterator {\n bytes data;\n uint offset;\n uint16 dnstype;\n uint16 class;\n uint32 ttl;\n uint rdataOffset;\n uint nextOffset;\n }\n\n /**\n * @dev Begins iterating over resource records.\n * @param self The byte string to read from.\n * @param offset The offset to start reading at.\n * @return ret An iterator object.\n */\n function iterateRRs(bytes memory self, uint offset) internal pure returns (RRIterator memory ret) {\n ret.data = self;\n ret.nextOffset = offset;\n next(ret);\n }\n\n /**\n * @dev Returns true iff there are more RRs to iterate.\n * @param iter The iterator to check.\n * @return True iff the iterator has finished.\n */\n function done(RRIterator memory iter) internal pure returns(bool) {\n return iter.offset >= iter.data.length;\n }\n\n /**\n * @dev Moves the iterator to the next resource record.\n * @param iter The iterator to advance.\n */\n function next(RRIterator memory iter) internal pure {\n iter.offset = iter.nextOffset;\n if (iter.offset >= iter.data.length) {\n return;\n }\n\n // Skip the name\n uint off = iter.offset + nameLength(iter.data, iter.offset);\n\n // Read type, class, and ttl\n iter.dnstype = iter.data.readUint16(off);\n off += 2;\n iter.class = iter.data.readUint16(off);\n off += 2;\n iter.ttl = iter.data.readUint32(off);\n off += 4;\n\n // Read the rdata\n uint rdataLength = iter.data.readUint16(off);\n off += 2;\n iter.rdataOffset = off;\n iter.nextOffset = off + rdataLength;\n }\n\n /**\n * @dev Returns the name of the current record.\n * @param iter The iterator.\n * @return A new bytes object containing the owner name from the RR.\n */\n function name(RRIterator memory iter) internal pure returns(bytes memory) {\n return iter.data.substring(iter.offset, nameLength(iter.data, iter.offset));\n }\n\n /**\n * @dev Returns the rdata portion of the current record.\n * @param iter The iterator.\n * @return A new bytes object containing the RR's RDATA.\n */\n function rdata(RRIterator memory iter) internal pure returns(bytes memory) {\n return iter.data.substring(iter.rdataOffset, iter.nextOffset - iter.rdataOffset);\n }\n\n uint constant DNSKEY_FLAGS = 0;\n uint constant DNSKEY_PROTOCOL = 2;\n uint constant DNSKEY_ALGORITHM = 3;\n uint constant DNSKEY_PUBKEY = 4;\n\n struct DNSKEY {\n uint16 flags;\n uint8 protocol;\n uint8 algorithm;\n bytes publicKey;\n }\n\n function readDNSKEY(bytes memory data, uint offset, uint length) internal pure returns(DNSKEY memory self) {\n self.flags = data.readUint16(offset + DNSKEY_FLAGS);\n self.protocol = data.readUint8(offset + DNSKEY_PROTOCOL);\n self.algorithm = data.readUint8(offset + DNSKEY_ALGORITHM);\n self.publicKey = data.substring(offset + DNSKEY_PUBKEY, length - DNSKEY_PUBKEY);\n } \n\n uint constant DS_KEY_TAG = 0;\n uint constant DS_ALGORITHM = 2;\n uint constant DS_DIGEST_TYPE = 3;\n uint constant DS_DIGEST = 4;\n\n struct DS {\n uint16 keytag;\n uint8 algorithm;\n uint8 digestType;\n bytes digest;\n }\n\n function readDS(bytes memory data, uint offset, uint length) internal pure returns(DS memory self) {\n self.keytag = data.readUint16(offset + DS_KEY_TAG);\n self.algorithm = data.readUint8(offset + DS_ALGORITHM);\n self.digestType = data.readUint8(offset + DS_DIGEST_TYPE);\n self.digest = data.substring(offset + DS_DIGEST, length - DS_DIGEST);\n }\n\n struct NSEC3 {\n uint8 hashAlgorithm;\n uint8 flags;\n uint16 iterations;\n bytes salt;\n bytes32 nextHashedOwnerName;\n bytes typeBitmap;\n }\n\n uint constant NSEC3_HASH_ALGORITHM = 0;\n uint constant NSEC3_FLAGS = 1;\n uint constant NSEC3_ITERATIONS = 2;\n uint constant NSEC3_SALT_LENGTH = 4;\n uint constant NSEC3_SALT = 5;\n\n function readNSEC3(bytes memory data, uint offset, uint length) internal pure returns(NSEC3 memory self) {\n uint end = offset + length;\n self.hashAlgorithm = data.readUint8(offset + NSEC3_HASH_ALGORITHM);\n self.flags = data.readUint8(offset + NSEC3_FLAGS);\n self.iterations = data.readUint16(offset + NSEC3_ITERATIONS);\n uint8 saltLength = data.readUint8(offset + NSEC3_SALT_LENGTH);\n offset = offset + NSEC3_SALT;\n self.salt = data.substring(offset, saltLength);\n offset += saltLength;\n uint8 nextLength = data.readUint8(offset);\n require(nextLength <= 32);\n offset += 1;\n self.nextHashedOwnerName = data.readBytesN(offset, nextLength);\n offset += nextLength;\n self.typeBitmap = data.substring(offset, end - offset);\n }\n\n function checkTypeBitmap(NSEC3 memory self, uint16 rrtype) internal pure returns(bool) {\n return checkTypeBitmap(self.typeBitmap, 0, rrtype);\n }\n\n /**\n * @dev Checks if a given RR type exists in a type bitmap.\n * @param bitmap The byte string to read the type bitmap from.\n * @param offset The offset to start reading at.\n * @param rrtype The RR type to check for.\n * @return True if the type is found in the bitmap, false otherwise.\n */\n function checkTypeBitmap(bytes memory bitmap, uint offset, uint16 rrtype) internal pure returns (bool) {\n uint8 typeWindow = uint8(rrtype >> 8);\n uint8 windowByte = uint8((rrtype & 0xff) / 8);\n uint8 windowBitmask = uint8(uint8(1) << (uint8(7) - uint8(rrtype & 0x7)));\n for (uint off = offset; off < bitmap.length;) {\n uint8 window = bitmap.readUint8(off);\n uint8 len = bitmap.readUint8(off + 1);\n if (typeWindow < window) {\n // We've gone past our window; it's not here.\n return false;\n } else if (typeWindow == window) {\n // Check this type bitmap\n if (len <= windowByte) {\n // Our type is past the end of the bitmap\n return false;\n }\n return (bitmap.readUint8(off + windowByte + 2) & windowBitmask) != 0;\n } else {\n // Skip this type bitmap\n off += len + 2;\n }\n }\n\n return false;\n }\n\n function compareNames(bytes memory self, bytes memory other) internal pure returns (int) {\n if (self.equals(other)) {\n return 0;\n }\n\n uint off;\n uint otheroff;\n uint prevoff;\n uint otherprevoff;\n uint counts = labelCount(self, 0);\n uint othercounts = labelCount(other, 0);\n\n // Keep removing labels from the front of the name until both names are equal length\n while (counts > othercounts) {\n prevoff = off;\n off = progress(self, off);\n counts--;\n }\n\n while (othercounts > counts) {\n otherprevoff = otheroff;\n otheroff = progress(other, otheroff);\n othercounts--;\n }\n\n // Compare the last nonequal labels to each other\n while (counts > 0 && !self.equals(off, other, otheroff)) {\n prevoff = off;\n off = progress(self, off);\n otherprevoff = otheroff;\n otheroff = progress(other, otheroff);\n counts -= 1;\n }\n\n if (off == 0) {\n return -1;\n }\n if(otheroff == 0) {\n return 1;\n }\n\n return self.compare(prevoff + 1, self.readUint8(prevoff), other, otherprevoff + 1, other.readUint8(otherprevoff));\n }\n\n function progress(bytes memory body, uint off) internal pure returns(uint) {\n return off + 1 + body.readUint8(off);\n }\n}\n", "sourcePath": "@ensdomains/dnssec-oracle/contracts/RRUtils.sol", "ast": { "absolutePath": "@ensdomains/dnssec-oracle/contracts/RRUtils.sol", "exportedSymbols": { "Buffer": [ 1452 ], "BytesUtils": [ 2183 ], "RRUtils": [ 3396 ] }, "id": 3397, "nodeType": "SourceUnit", "nodes": [ { "id": 2275, "literals": [ "solidity", "^", "0.7", ".4" ], "nodeType": "PragmaDirective", "src": "0:23:9" }, { "absolutePath": "@ensdomains/dnssec-oracle/contracts/BytesUtils.sol", "file": "./BytesUtils.sol", "id": 2276, "nodeType": "ImportDirective", "scope": 3397, "sourceUnit": 2184, "src": "25:26:9", "symbolAliases": [], "unitAlias": "" }, { "absolutePath": "@ensdomains/buffer/contracts/Buffer.sol", "file": "@ensdomains/buffer/contracts/Buffer.sol", "id": 2277, "nodeType": "ImportDirective", "scope": 3397, "sourceUnit": 1453, "src": "52:49:9", "symbolAliases": [], "unitAlias": "" }, { "abstract": false, "baseContracts": [], "contractDependencies": [], "contractKind": "library", "documentation": { "id": 2278, "nodeType": "StructuredDocumentation", "src": "103:92:9", "text": " @dev RRUtils is a library that provides utilities for parsing DNS resource records." }, "fullyImplemented": true, "id": 3396, "linearizedBaseContracts": [ 3396 ], "name": "RRUtils", "nodeType": "ContractDefinition", "nodes": [ { "id": 2280, "libraryName": { "id": 2279, "name": "BytesUtils", "nodeType": 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"BinaryOperation", "operator": "<", "rightExpression": { "expression": { "id": 2299, "name": "self", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 2285, "src": "691:4:9", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } }, "id": 2300, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "memberName": "length", "nodeType": "MemberAccess", "src": "691:11:9", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "src": "685:17:9", "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_bool", "typeString": "bool" } ], "id": 2297, "name": "assert", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": -3, "src": "678:6:9", "typeDescriptions": { "typeIdentifier": "t_function_assert_pure$_t_bool_$returns$__$", "typeString": "function (bool) pure" } }, "id": 2302, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "678:25:9", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_tuple$__$", "typeString": "tuple()" } }, "id": 2303, "nodeType": "ExpressionStatement", "src": "678:25:9" }, { "assignments": [ 2305 ], "declarations": [ { "constant": false, "id": 2305, "mutability": "mutable", "name": "labelLen", "nodeType": "VariableDeclaration", "scope": 2323, "src": "717:13:9", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "typeName": { "id": 2304, "name": "uint", "nodeType": "ElementaryTypeName", "src": "717:4:9", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "visibility": "internal" } ], "id": 2310, "initialValue": { "arguments": [ { "id": 2308, "name": "idx", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 2293, "src": "748:3:9", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_uint256", "typeString": "uint256" } ], "expression": { "id": 2306, "name": "self", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 2285, "src": "733:4:9", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } }, "id": 2307, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "memberName": "readUint8", "nodeType": "MemberAccess", "referencedDeclaration": 1764, "src": "733:14:9", "typeDescriptions": { "typeIdentifier": "t_function_internal_pure$_t_bytes_memory_ptr_$_t_uint256_$returns$_t_uint8_$bound_to$_t_bytes_memory_ptr_$", "typeString": "function (bytes memory,uint256) pure returns (uint8)" } }, "id": 2309, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "733:19:9", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_uint8", "typeString": "uint8" } }, "nodeType": "VariableDeclarationStatement", "src": "717:35:9" }, { "expression": { "id": 2315, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "leftHandSide": { "id": 2311, "name": "idx", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 2293, "src": "766:3:9", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "nodeType": "Assignment", "operator": "+=", "rightHandSide": { "commonType": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "id": 2314, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "leftExpression": { "id": 2312, "name": "labelLen", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 2305, "src": "773:8:9", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "nodeType": "BinaryOperation", "operator": "+", "rightExpression": { "hexValue": "31", "id": 2313, "isConstant": false, "isLValue": false, "isPure": true, "kind": "number", "lValueRequested": false, "nodeType": "Literal", "src": "784:1:9", "typeDescriptions": { "typeIdentifier": "t_rational_1_by_1", "typeString": "int_const 1" }, "value": "1" }, "src": "773:12:9", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "src": "766:19:9", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "id": 2316, "nodeType": "ExpressionStatement", "src": "766:19:9" }, { "condition": { "commonType": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "id": 2319, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "leftExpression": { "id": 2317, "name": "labelLen", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 2305, "src": "803:8:9", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "nodeType": "BinaryOperation", "operator": "==", "rightExpression": { "hexValue": "30", "id": 2318, "isConstant": false, "isLValue": false, "isPure": true, "kind": "number", "lValueRequested": false, "nodeType": "Literal", "src": "815:1:9", "typeDescriptions": { "typeIdentifier": "t_rational_0_by_1", "typeString": "int_const 0" }, "value": "0" }, "src": "803:13:9", "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" } }, "id": 2322, "nodeType": "IfStatement", "src": "799:57:9", "trueBody": { "id": 2321, "nodeType": "Block", "src": "818:38:9", "statements": [ { "id": 2320, "nodeType": "Break", "src": "836:5:9" } ] } } ] }, "condition": { "hexValue": "74727565", "id": 2296, "isConstant": false, "isLValue": false, "isPure": true, "kind": "bool", "lValueRequested": false, "nodeType": "Literal", "src": "658:4:9", "typeDescriptions": { 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