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119 lines
3.7 KiB
C++
119 lines
3.7 KiB
C++
#include <Columns/ColumnString.h>
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#include <Columns/ColumnArray.h>
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#include <Functions/FunctionFactory.h>
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#include <Functions/IFunction.h>
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#include <DataTypes/DataTypeString.h>
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#include <DataTypes/DataTypeArray.h>
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#include <Common/DNSResolver.h>
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#include <Poco/Net/IPAddress.h>
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#include <Interpreters/Context.h>
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#include <Poco/Util/AbstractConfiguration.h>
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namespace DB
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{
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namespace ErrorCodes
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{
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extern const int NUMBER_OF_ARGUMENTS_DOESNT_MATCH;
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extern const int BAD_ARGUMENTS;
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extern const int FUNCTION_NOT_ALLOWED;
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}
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class ReverseDNSQuery : public IFunction
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{
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public:
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static constexpr auto name = "reverseDNSQuery";
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static constexpr auto allow_function_config_name = "allow_reverse_dns_query_function";
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static FunctionPtr create(ContextPtr)
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{
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return std::make_shared<ReverseDNSQuery>();
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}
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String getName() const override
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{
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return name;
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}
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ColumnPtr executeImpl(const ColumnsWithTypeAndName & arguments, const DataTypePtr & data_type, size_t input_rows_count) const override
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{
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if (!Context::getGlobalContextInstance()->getConfigRef().getBool(allow_function_config_name, false))
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{
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throw Exception(ErrorCodes::FUNCTION_NOT_ALLOWED, "Function {} is not allowed because {} is not set", name, allow_function_config_name);
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}
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if (arguments.empty())
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{
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throw Exception(ErrorCodes::NUMBER_OF_ARGUMENTS_DOESNT_MATCH, "Function {} requires at least one argument", name);
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}
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auto res_type = getReturnTypeImpl({data_type});
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if (input_rows_count == 0u)
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{
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return res_type->createColumnConstWithDefaultValue(input_rows_count);
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}
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if (!isString(arguments[0].type))
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{
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throw Exception(ErrorCodes::BAD_ARGUMENTS, "Function {} requires the input column to be of type String", name);
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}
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auto input_column = arguments[0].column;
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auto ip_address = Poco::Net::IPAddress(input_column->getDataAt(0).toString());
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auto ptr_records = DNSResolver::instance().reverseResolve(ip_address);
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if (ptr_records.empty())
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return res_type->createColumnConstWithDefaultValue(input_rows_count);
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Array res;
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for (const auto & ptr_record : ptr_records)
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{
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res.push_back(ptr_record);
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}
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return res_type->createColumnConst(input_rows_count, res);
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}
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bool isSuitableForShortCircuitArgumentsExecution(const DataTypesWithConstInfo & /*arguments*/) const override
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{
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return false;
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}
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size_t getNumberOfArguments() const override
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{
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return 1u;
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}
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DataTypePtr getReturnTypeImpl(const DataTypes & /*arguments*/) const override
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{
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return std::make_shared<DataTypeArray>(std::make_shared<DataTypeString>());
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}
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};
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REGISTER_FUNCTION(ReverseDNSQuery)
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{
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factory.registerFunction<ReverseDNSQuery>(
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FunctionDocumentation{
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.description = R"(Performs a reverse DNS query to get the PTR records associated with the IP address)",
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.syntax = "reverseDNSQuery(address)",
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.arguments = {{"address", "An IPv4 or IPv6 address. [String](../../sql-reference/data-types/string.md)"}},
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.returned_value = "Associated domains (PTR records). [String](../../sql-reference/data-types/string.md).",
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.examples = {{"",
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"SELECT reverseDNSQuery('192.168.0.2');",
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R"(
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┌─reverseDNSQuery('192.168.0.2')────────────┐
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│ ['test2.example.com','test3.example.com'] │
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└───────────────────────────────────────────┘
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)"}}
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}
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);
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}
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}
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