{ "contractName": "DNSClaimChecker", "abi": [], "metadata": "{\"compiler\":{\"version\":\"0.7.4+commit.3f05b770\"},\"language\":\"Solidity\",\"output\":{\"abi\":[],\"devdoc\":{\"kind\":\"dev\",\"methods\":{},\"version\":1},\"userdoc\":{\"kind\":\"user\",\"methods\":{},\"version\":1}},\"settings\":{\"compilationTarget\":{\"/home/arachnid/Dropbox/projects/dnsregistrar/contracts/DNSClaimChecker.sol\":\"DNSClaimChecker\"},\"evmVersion\":\"istanbul\",\"libraries\":{},\"metadata\":{\"bytecodeHash\":\"ipfs\"},\"optimizer\":{\"enabled\":false,\"runs\":200},\"remappings\":[]},\"sources\":{\"/home/arachnid/Dropbox/projects/dnsregistrar/contracts/DNSClaimChecker.sol\":{\"keccak256\":\"0x09651e258e14992928296855b27f397bc7c03caf3787a3c11264cf6513e61f55\",\"urls\":[\"bzz-raw://f954dc0699fccaf7988a43f51b4c0cd9b969ab485527b8576d17b828377002d2\",\"dweb:/ipfs/Qme9Rqb1WjtjPuTNJ6tSrZdceQHQA4bzz2t88kJMDp4MNV\"]},\"@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/DNSSEC.sol\":{\"keccak256\":\"0x8657b615b0d13ca3c52be359127af8d4251b845255cf870ac30f3541eaa62db8\",\"urls\":[\"bzz-raw://2db577b2144ea6b7439d7a244b931b704ecea548bba5707df57528b56d528c81\",\"dweb:/ipfs/QmbjYLu3w6DrLvvY9fFCFBUc2mfjjvj2ULeEBKw6FXHR6q\"]},\"@ensdomains/dnssec-oracle/contracts/RRUtils.sol\":{\"keccak256\":\"0x52cca336743e65b57ce01a30bbc7ed8523758853ab7d35db57a6f40d4a3bf892\",\"urls\":[\"bzz-raw://feb1f75afcea14258289d466c9bfcb4cf648858791ff1780b5d3a4191e4158e2\",\"dweb:/ipfs/QmTc4vx6sEx9jW3Efu1QAFQQ7JTarfMDYwgv4FzZoxTWUx\"]}},\"version\":1}", "bytecode": "0x60566023600b82828239805160001a607314601657fe5b30600052607381538281f3fe73000000000000000000000000000000000000000030146080604052600080fdfea2646970667358221220c0ec8d7a1db5909d3c18e1946876eba616dc53fce5b808085907e9955cc3ae3764736f6c63430007040033", "deployedBytecode": "0x73000000000000000000000000000000000000000030146080604052600080fdfea2646970667358221220c0ec8d7a1db5909d3c18e1946876eba616dc53fce5b808085907e9955cc3ae3764736f6c63430007040033", "immutableReferences": {}, "generatedSources": [], "deployedGeneratedSources": [], "sourceMap": "252:2765:0:-:0;;;;;;;;;;;;;;;;;;;;;;;;;", "deployedSourceMap": "252:2765:0:-:0;;;;;;;;", "source": "pragma solidity ^0.7.0;\n\nimport \"@ensdomains/dnssec-oracle/contracts/DNSSEC.sol\";\nimport \"@ensdomains/dnssec-oracle/contracts/BytesUtils.sol\";\nimport \"@ensdomains/dnssec-oracle/contracts/RRUtils.sol\";\nimport \"@ensdomains/buffer/contracts/Buffer.sol\";\n\nlibrary DNSClaimChecker {\n\n using BytesUtils for bytes;\n using RRUtils for *;\n using Buffer for Buffer.buffer;\n\n uint16 constant CLASS_INET = 1;\n uint16 constant TYPE_TXT = 16;\n\n function getOwnerAddress(DNSSEC oracle, bytes memory name, bytes memory proof)\n internal\n view\n returns (address, bool)\n {\n // Add \"_ens.\" to the front of the name.\n Buffer.buffer memory buf;\n buf.init(name.length + 5);\n buf.append(\"\\x04_ens\");\n buf.append(name);\n bytes20 hash;\n uint64 inserted;\n // Check the provided TXT record has been validated by the oracle\n (, inserted, hash) = oracle.rrdata(TYPE_TXT, buf.buf);\n if (hash == bytes20(0) && proof.length == 0) return (address(0x0), false);\n\n require(hash == bytes20(keccak256(proof)));\n\n for (RRUtils.RRIterator memory iter = proof.iterateRRs(0); !iter.done(); iter.next()) {\n require(inserted + iter.ttl >= block.timestamp, \"DNS record is stale; refresh or delete it before proceeding.\");\n\n bool found;\n address addr;\n (addr, found) = parseRR(proof, iter.rdataOffset);\n if (found) {\n return (addr, true);\n }\n }\n\n return (address(0x0), false);\n }\n\n function parseRR(bytes memory rdata, uint idx) internal pure returns (address, bool) {\n while (idx < rdata.length) {\n uint len = rdata.readUint8(idx); idx += 1;\n\n bool found;\n address addr;\n (addr, found) = parseString(rdata, idx, len);\n\n if (found) return (addr, true);\n idx += len;\n }\n\n return (address(0x0), false);\n }\n\n function parseString(bytes memory str, uint idx, uint len) internal pure returns (address, bool) {\n // TODO: More robust parsing that handles whitespace and multiple key/value pairs\n if (str.readUint32(idx) != 0x613d3078) return (address(0x0), false); // 0x613d3078 == 'a=0x'\n if (len < 44) return (address(0x0), false);\n return hexToAddress(str, idx + 4);\n }\n\n function hexToAddress(bytes memory str, uint idx) internal pure returns (address, bool) {\n if (str.length - idx < 40) return (address(0x0), false);\n uint ret = 0;\n for (uint i = idx; i < idx + 40; i++) {\n ret <<= 4;\n uint x = str.readUint8(i);\n if (x >= 48 && x < 58) {\n ret |= x - 48;\n } else if (x >= 65 && x < 71) {\n ret |= x - 55;\n } else if (x >= 97 && x < 103) {\n ret |= x - 87;\n } else {\n return (address(0x0), false);\n }\n }\n return (address(ret), true);\n }\n}\n", "sourcePath": "/home/arachnid/Dropbox/projects/dnsregistrar/contracts/DNSClaimChecker.sol", "ast": { "absolutePath": "/home/arachnid/Dropbox/projects/dnsregistrar/contracts/DNSClaimChecker.sol", "exportedSymbols": { "Buffer": [ 1452 ], "BytesUtils": [ 2183 ], "DNSClaimChecker": [ 390 ], "DNSSEC": [ 2273 ], "RRUtils": [ 3396 ] }, "id": 391, "nodeType": "SourceUnit", "nodes": [ { "id": 1, "literals": [ "solidity", "^", "0.7", ".0" ], "nodeType": "PragmaDirective", "src": "0:23:0" }, { "absolutePath": "@ensdomains/dnssec-oracle/contracts/DNSSEC.sol", "file": "@ensdomains/dnssec-oracle/contracts/DNSSEC.sol", "id": 2, "nodeType": "ImportDirective", "scope": 391, "sourceUnit": 2274, "src": "25:56:0", "symbolAliases": [], "unitAlias": "" }, { "absolutePath": "@ensdomains/dnssec-oracle/contracts/BytesUtils.sol", "file": "@ensdomains/dnssec-oracle/contracts/BytesUtils.sol", "id": 3, "nodeType": "ImportDirective", "scope": 391, "sourceUnit": 2184, "src": "82:60:0", "symbolAliases": [], "unitAlias": "" }, { "absolutePath": "@ensdomains/dnssec-oracle/contracts/RRUtils.sol", "file": "@ensdomains/dnssec-oracle/contracts/RRUtils.sol", "id": 4, "nodeType": "ImportDirective", "scope": 391, "sourceUnit": 3397, "src": "143:57:0", "symbolAliases": [], "unitAlias": "" }, { "absolutePath": "@ensdomains/buffer/contracts/Buffer.sol", "file": "@ensdomains/buffer/contracts/Buffer.sol", "id": 5, "nodeType": "ImportDirective", "scope": 391, "sourceUnit": 1453, "src": "201:49:0", "symbolAliases": [], "unitAlias": "" }, { "abstract": false, "baseContracts": [], "contractDependencies": [], "contractKind": "library", "fullyImplemented": true, "id": 390, "linearizedBaseContracts": [ 390 ], "name": "DNSClaimChecker", "nodeType": "ContractDefinition", "nodes": [ { "id": 8, "libraryName": { "id": 6, "name": "BytesUtils", "nodeType": "UserDefinedTypeName", "referencedDeclaration": 2183, "src": "289:10:0", "typeDescriptions": { "typeIdentifier": "t_contract$_BytesUtils_$2183", "typeString": "library BytesUtils" } }, "nodeType": "UsingForDirective", "src": "283:27:0", "typeName": { "id": 7, "name": "bytes", "nodeType": "ElementaryTypeName", "src": "304:5:0", "typeDescriptions": { "typeIdentifier": "t_bytes_storage_ptr", "typeString": "bytes" } } }, { "id": 10, "libraryName": { "id": 9, "name": "RRUtils", "nodeType": "UserDefinedTypeName", "referencedDeclaration": 3396, "src": "321:7:0", "typeDescriptions": { "typeIdentifier": "t_contract$_RRUtils_$3396", "typeString": "library RRUtils" } }, "nodeType": "UsingForDirective", "src": "315:20:0" }, { "id": 13, "libraryName": { "id": 11, "name": "Buffer", "nodeType": "UserDefinedTypeName", "referencedDeclaration": 1452, "src": "346:6:0", "typeDescriptions": { 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"src": "406:1:0", "typeDescriptions": { "typeIdentifier": "t_rational_1_by_1", "typeString": "int_const 1" }, "value": "1" }, "visibility": "internal" }, { "constant": true, "id": 19, "mutability": "constant", "name": "TYPE_TXT", "nodeType": "VariableDeclaration", "scope": 390, "src": "413:29:0", "stateVariable": true, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_uint16", "typeString": "uint16" }, "typeName": { "id": 17, "name": "uint16", "nodeType": "ElementaryTypeName", "src": "413:6:0", "typeDescriptions": { "typeIdentifier": "t_uint16", "typeString": "uint16" } }, "value": { "hexValue": "3136", "id": 18, "isConstant": false, "isLValue": false, "isPure": true, "kind": "number", "lValueRequested": false, "nodeType": "Literal", "src": "440:2:0", "typeDescriptions": { "typeIdentifier": "t_rational_16_by_1", "typeString": "int_const 16" }, "value": "16" }, "visibility": "internal" }, { "body": { "id": 165, "nodeType": "Block", "src": "594:963:0", 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