{ "contractName": "DNSClaimChecker", "abi": [], "bytecode": "0x604c602c600b82828239805160001a60731460008114601c57601e565bfe5b5030600052607381538281f3fe73000000000000000000000000000000000000000030146080604052600080fdfea165627a7a72305820cc173881181fcdf5e1493e130e1e3640086689b217a3da2dbe55dedec47a66e40029", "deployedBytecode": "0x73000000000000000000000000000000000000000030146080604052600080fdfea165627a7a72305820cc173881181fcdf5e1493e130e1e3640086689b217a3da2dbe55dedec47a66e40029", "sourceMap": "252:3098:0:-;;132:2:-1;166:7;155:9;146:7;137:37;252:7;246:14;243:1;238:23;232:4;229:33;270:1;265:20;;;;222:63;;265:20;274:9;222:63;;298:9;295:1;288:20;328:4;319:7;311:22;352:7;343;336:24", "deployedSourceMap": "252:3098:0:-;;;;;;;;", "source": "pragma solidity ^0.5.0;\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 getLabels(bytes memory name) internal view returns (bytes32, bytes32) {\n uint len = name.readUint8(0);\n uint second = name.readUint8(len + 1);\n\n require(name.readUint8(len + second + 2) == 0);\n\n return (name.keccak(1, len), keccak256(abi.encodePacked(bytes32(0), name.keccak(2 + len, second))));\n }\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 >= now, \"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}\n", "sourcePath": "/Users/makoto/work/ens/dnsregistrar/contracts/DNSClaimChecker.sol", "ast": { "absolutePath": "/Users/makoto/work/ens/dnsregistrar/contracts/DNSClaimChecker.sol", "exportedSymbols": { "DNSClaimChecker": [ 440 ] }, "id": 441, "nodeType": "SourceUnit", "nodes": [ { "id": 1, "literals": [ "solidity", "^", "0.5", ".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": 441, "sourceUnit": 1905, "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": 441, "sourceUnit": 1832, "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": 441, "sourceUnit": 2526, "src": "143:57:0", "symbolAliases": [], "unitAlias": "" }, { "absolutePath": "@ensdomains/buffer/contracts/Buffer.sol", "file": "@ensdomains/buffer/contracts/Buffer.sol", "id": 5, "nodeType": "ImportDirective", "scope": 441, "sourceUnit": 1107, "src": "201:49:0", "symbolAliases": [], "unitAlias": "" }, { "baseContracts": [], "contractDependencies": [], "contractKind": "library", "documentation": null, "fullyImplemented": true, "id": 440, "linearizedBaseContracts": [ 440 ], "name": "DNSClaimChecker", "nodeType": "ContractDefinition", "nodes": [ { "id": 8, "libraryName": { "contractScope": null, "id": 6, "name": "BytesUtils", "nodeType": "UserDefinedTypeName", "referencedDeclaration": 1831, "src": "289:10:0", "typeDescriptions": { "typeIdentifier": "t_contract$_BytesUtils_$1831", "typeString": "library BytesUtils" } }, "nodeType": "UsingForDirective", "src": "283:27:0", "typeName": { "id": 7, "name": "bytes", "nodeType": "ElementaryTypeName", "src": "304:5:0", "typeDescriptions": { "typeIdentifier": "t_bytes_storage_ptr", "typeString": "bytes" } } }, { "id": 10, "libraryName": { "contractScope": null, "id": 9, "name": "RRUtils", "nodeType": "UserDefinedTypeName", "referencedDeclaration": 2525, "src": "321:7:0", "typeDescriptions": { "typeIdentifier": "t_contract$_RRUtils_$2525", "typeString": "library RRUtils" } }, "nodeType": "UsingForDirective", "src": "315:20:0", "typeName": null }, { "id": 13, "libraryName": { "contractScope": null, "id": 11, "name": "Buffer", "nodeType": "UserDefinedTypeName", "referencedDeclaration": 1106, "src": "346:6:0", "typeDescriptions": { "typeIdentifier": "t_contract$_Buffer_$1106", "typeString": "library Buffer" } }, "nodeType": "UsingForDirective", "src": "340:31:0", "typeName": { "contractScope": null, "id": 12, "name": "Buffer.buffer", "nodeType": "UserDefinedTypeName", "referencedDeclaration": 655, "src": "357:13:0", "typeDescriptions": { "typeIdentifier": "t_struct$_buffer_$655_storage_ptr", "typeString": "struct Buffer.buffer" } } }, { "constant": true, "id": 16, "name": "CLASS_INET", "nodeType": "VariableDeclaration", "scope": 440, "src": "377:30:0", "stateVariable": true, "storageLocation": "default", 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