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385 lines
14 KiB
C++
385 lines
14 KiB
C++
#pragma once
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#include <type_traits>
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#include <Common/formatIPv6.h>
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#include <Common/IPv6ToBinary.h>
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#include <Columns/ColumnFixedString.h>
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#include <Columns/ColumnNullable.h>
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#include <Columns/ColumnString.h>
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#include <Columns/ColumnsNumber.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 CANNOT_PARSE_IPV4;
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extern const int CANNOT_PARSE_IPV6;
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extern const int ILLEGAL_COLUMN;
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extern const int CANNOT_CONVERT_TYPE;
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}
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enum class IPStringToNumExceptionMode : uint8_t
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{
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Throw,
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Default,
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Null
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};
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static inline bool tryParseIPv4(const char * pos, UInt32 & result_value)
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{
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return parseIPv4whole(pos, reinterpret_cast<unsigned char *>(&result_value));
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}
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namespace detail
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{
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template <IPStringToNumExceptionMode exception_mode, typename ToColumn = ColumnIPv6, typename StringColumnType>
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ColumnPtr convertToIPv6(const StringColumnType & string_column, const PaddedPODArray<UInt8> * null_map = nullptr)
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{
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if constexpr (!std::is_same_v<ToColumn, ColumnFixedString> && !std::is_same_v<ToColumn, ColumnIPv6>)
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throw Exception(ErrorCodes::ILLEGAL_COLUMN,
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"Illegal return column type {}. Expected IPv6 or FixedString",
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TypeName<typename ToColumn::ValueType>);
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size_t column_size = string_column.size();
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ColumnUInt8::MutablePtr col_null_map_to;
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ColumnUInt8::Container * vec_null_map_to = nullptr;
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if constexpr (exception_mode == IPStringToNumExceptionMode::Null)
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{
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col_null_map_to = ColumnUInt8::create(column_size, false);
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vec_null_map_to = &col_null_map_to->getData();
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}
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/// This is a special treatment for source column of type FixedString(16)
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/// to preserve previous behavior when IPv6 was a domain type of FixedString(16)
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if constexpr (std::is_same_v<StringColumnType, ColumnFixedString>)
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{
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if (string_column.getN() == IPV6_BINARY_LENGTH)
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{
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if constexpr (std::is_same_v<ToColumn, ColumnFixedString>)
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{
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auto col_res = ColumnFixedString::create(string_column);
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if constexpr (exception_mode == IPStringToNumExceptionMode::Null)
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{
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col_null_map_to = ColumnUInt8::create(column_size, false);
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if (null_map)
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memcpy(col_null_map_to->getData().data(), null_map->data(), column_size);
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return ColumnNullable::create(std::move(col_res), std::move(col_null_map_to));
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}
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return col_res;
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}
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else
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{
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auto col_res = ColumnIPv6::create();
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auto & vec_res = col_res->getData();
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vec_res.resize(column_size);
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memcpy(vec_res.data(), string_column.getChars().data(), column_size * IPV6_BINARY_LENGTH);
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if constexpr (exception_mode == IPStringToNumExceptionMode::Null)
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{
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col_null_map_to = ColumnUInt8::create(column_size, false);
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if (null_map)
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memcpy(col_null_map_to->getData().data(), null_map->data(), column_size);
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return ColumnNullable::create(std::move(col_res), std::move(col_null_map_to));
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}
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return col_res;
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}
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}
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}
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auto column_create = []() -> typename ToColumn::MutablePtr
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{
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if constexpr (std::is_same_v<ToColumn, ColumnFixedString>)
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return ColumnFixedString::create(IPV6_BINARY_LENGTH);
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else
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return ColumnIPv6::create();
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};
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auto get_vector = [](auto & col_res, size_t col_size) -> decltype(auto)
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{
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if constexpr (std::is_same_v<ToColumn, ColumnFixedString>)
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{
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auto & vec_res = col_res->getChars();
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vec_res.resize(col_size * IPV6_BINARY_LENGTH);
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return (vec_res);
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}
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else
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{
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auto & vec_res = col_res->getData();
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vec_res.resize(col_size);
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return (vec_res);
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}
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};
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auto col_res = column_create();
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auto & vec_res = get_vector(col_res, column_size);
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using Chars = typename StringColumnType::Chars;
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const Chars & vec_src = string_column.getChars();
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size_t src_offset = 0;
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char src_ipv4_buf[sizeof("::ffff:") + IPV4_MAX_TEXT_LENGTH + 1] = "::ffff:";
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/// ColumnFixedString contains not null terminated strings. But functions parseIPv6, parseIPv4 expect null terminated string.
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/// TODO fix this - now parseIPv6/parseIPv4 accept end iterator, so can be parsed in-place
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std::string fixed_string_buffer;
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if constexpr (std::is_same_v<StringColumnType, ColumnFixedString>)
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{
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fixed_string_buffer.resize(string_column.getN());
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}
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int offset_inc = 1;
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if constexpr (std::is_same_v<ToColumn, ColumnFixedString>)
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offset_inc = IPV6_BINARY_LENGTH;
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for (size_t out_offset = 0, i = 0; i < column_size; out_offset += offset_inc, ++i)
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{
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size_t src_next_offset = src_offset;
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const char * src_value = nullptr;
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unsigned char * res_value = reinterpret_cast<unsigned char *>(&vec_res[out_offset]);
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if constexpr (std::is_same_v<StringColumnType, ColumnString>)
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{
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src_value = reinterpret_cast<const char *>(&vec_src[src_offset]);
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src_next_offset = string_column.getOffsets()[i];
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}
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else if constexpr (std::is_same_v<StringColumnType, ColumnFixedString>)
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{
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size_t fixed_string_size = string_column.getN();
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std::memcpy(fixed_string_buffer.data(), reinterpret_cast<const char *>(&vec_src[src_offset]), fixed_string_size);
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src_value = fixed_string_buffer.data();
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src_next_offset += fixed_string_size;
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}
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if (null_map && (*null_map)[i])
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{
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std::fill_n(&vec_res[out_offset], offset_inc, 0);
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src_offset = src_next_offset;
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if constexpr (exception_mode == IPStringToNumExceptionMode::Null)
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(*vec_null_map_to)[i] = true;
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continue;
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}
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bool parse_result = false;
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UInt32 dummy_result = 0;
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/// For both cases below: In case of failure, the function parseIPv6 fills vec_res with zero bytes.
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/// If the source IP address is parsable as an IPv4 address, then transform it into a valid IPv6 address.
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/// Keeping it simple by just prefixing `::ffff:` to the IPv4 address to represent it as a valid IPv6 address.
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if (tryParseIPv4(src_value, dummy_result))
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{
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std::memcpy(
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src_ipv4_buf + std::strlen("::ffff:"),
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src_value,
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std::min<UInt64>(src_next_offset - src_offset, IPV4_MAX_TEXT_LENGTH + 1));
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parse_result = parseIPv6whole(src_ipv4_buf, res_value);
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}
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else
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{
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parse_result = parseIPv6whole(src_value, res_value);
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}
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if (!parse_result)
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{
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if constexpr (exception_mode == IPStringToNumExceptionMode::Throw)
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throw Exception(ErrorCodes::CANNOT_PARSE_IPV6, "Invalid IPv6 value");
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else if constexpr (exception_mode == IPStringToNumExceptionMode::Default)
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vec_res[i] = 0;
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else if constexpr (exception_mode == IPStringToNumExceptionMode::Null)
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(*vec_null_map_to)[i] = true;
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}
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src_offset = src_next_offset;
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}
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if constexpr (exception_mode == IPStringToNumExceptionMode::Null)
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return ColumnNullable::create(std::move(col_res), std::move(col_null_map_to));
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return col_res;
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}
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}
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template <IPStringToNumExceptionMode exception_mode, typename ToColumn = ColumnIPv6>
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ColumnPtr convertToIPv6(ColumnPtr column, const PaddedPODArray<UInt8> * null_map = nullptr)
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{
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if (const auto * column_input_string = checkAndGetColumn<ColumnString>(column.get()))
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{
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return detail::convertToIPv6<exception_mode, ToColumn>(*column_input_string, null_map);
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}
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else if (const auto * column_input_fixed_string = checkAndGetColumn<ColumnFixedString>(column.get()))
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{
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return detail::convertToIPv6<exception_mode, ToColumn>(*column_input_fixed_string, null_map);
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}
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else
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{
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throw Exception(ErrorCodes::ILLEGAL_COLUMN, "Illegal column type {}. Expected String or FixedString", column->getName());
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}
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}
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template <IPStringToNumExceptionMode exception_mode, typename ToColumn = ColumnIPv4>
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ColumnPtr convertToIPv4(ColumnPtr column, const PaddedPODArray<UInt8> * null_map = nullptr)
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{
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const ColumnString * column_string = checkAndGetColumn<ColumnString>(column.get());
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if (!column_string)
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{
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throw Exception(ErrorCodes::ILLEGAL_COLUMN, "Illegal column type {}. Expected String.", column->getName());
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}
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size_t column_size = column_string->size();
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ColumnUInt8::MutablePtr col_null_map_to;
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ColumnUInt8::Container * vec_null_map_to = nullptr;
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if constexpr (exception_mode == IPStringToNumExceptionMode::Null)
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{
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col_null_map_to = ColumnUInt8::create(column_size, false);
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vec_null_map_to = &col_null_map_to->getData();
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}
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auto col_res = ToColumn::create();
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auto & vec_res = col_res->getData();
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vec_res.resize(column_size);
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const ColumnString::Chars & vec_src = column_string->getChars();
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const ColumnString::Offsets & offsets_src = column_string->getOffsets();
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size_t prev_offset = 0;
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for (size_t i = 0; i < vec_res.size(); ++i)
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{
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if (null_map && (*null_map)[i])
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{
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vec_res[i] = 0;
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prev_offset = offsets_src[i];
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if constexpr (exception_mode == IPStringToNumExceptionMode::Null)
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(*vec_null_map_to)[i] = true;
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continue;
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}
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bool parse_result = tryParseIPv4(reinterpret_cast<const char *>(&vec_src[prev_offset]), vec_res[i]);
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if (!parse_result)
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{
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if constexpr (exception_mode == IPStringToNumExceptionMode::Throw)
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{
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throw Exception(ErrorCodes::CANNOT_PARSE_IPV4, "Invalid IPv4 value");
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}
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else if constexpr (exception_mode == IPStringToNumExceptionMode::Default)
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{
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vec_res[i] = 0;
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}
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else if constexpr (exception_mode == IPStringToNumExceptionMode::Null)
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{
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(*vec_null_map_to)[i] = true;
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vec_res[i] = 0;
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}
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}
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prev_offset = offsets_src[i];
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}
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if constexpr (exception_mode == IPStringToNumExceptionMode::Null)
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return ColumnNullable::create(std::move(col_res), std::move(col_null_map_to));
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return col_res;
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}
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template <IPStringToNumExceptionMode exception_mode, typename ToColumn = ColumnIPv4>
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ColumnPtr convertIPv6ToIPv4(ColumnPtr column, const PaddedPODArray<UInt8> * null_map = nullptr)
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{
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const ColumnIPv6 * column_ipv6 = checkAndGetColumn<ColumnIPv6>(column.get());
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if (!column_ipv6)
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throw Exception(ErrorCodes::ILLEGAL_COLUMN, "Illegal column type {}. Expected IPv6.", column->getName());
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size_t column_size = column_ipv6->size();
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ColumnUInt8::MutablePtr col_null_map_to;
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ColumnUInt8::Container * vec_null_map_to = nullptr;
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if constexpr (exception_mode == IPStringToNumExceptionMode::Null)
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{
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col_null_map_to = ColumnUInt8::create(column_size, false);
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vec_null_map_to = &col_null_map_to->getData();
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}
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const uint8_t ip4_cidr[] {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xff, 0xff, 0x00, 0x00, 0x00, 0x00};
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auto col_res = ToColumn::create();
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auto & vec_res = col_res->getData();
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vec_res.resize(column_size);
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const auto & vec_src = column_ipv6->getData();
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for (size_t i = 0; i < vec_res.size(); ++i)
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{
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const uint8_t * src = reinterpret_cast<const uint8_t *>(&vec_src[i]);
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uint8_t * dst = reinterpret_cast<uint8_t *>(&vec_res[i]);
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if (null_map && (*null_map)[i])
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{
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std::memset(dst, '\0', IPV4_BINARY_LENGTH);
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if constexpr (exception_mode == IPStringToNumExceptionMode::Null)
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(*vec_null_map_to)[i] = true;
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continue;
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}
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if (!matchIPv6Subnet(src, ip4_cidr, 96))
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{
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if constexpr (exception_mode == IPStringToNumExceptionMode::Throw)
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{
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char addr[IPV6_MAX_TEXT_LENGTH + 1] {};
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char * paddr = addr;
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formatIPv6(src, paddr);
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throw Exception(ErrorCodes::CANNOT_CONVERT_TYPE, "IPv6 {} in column {} is not in IPv4 mapping block", addr, column->getName());
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}
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else if constexpr (exception_mode == IPStringToNumExceptionMode::Default)
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{
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std::memset(dst, '\0', IPV4_BINARY_LENGTH);
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}
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else if constexpr (exception_mode == IPStringToNumExceptionMode::Null)
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{
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(*vec_null_map_to)[i] = true;
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std::memset(dst, '\0', IPV4_BINARY_LENGTH);
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}
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continue;
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}
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if constexpr (std::endian::native == std::endian::little)
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{
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dst[0] = src[15];
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dst[1] = src[14];
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dst[2] = src[13];
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dst[3] = src[12];
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}
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else
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{
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dst[0] = src[12];
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dst[1] = src[13];
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dst[2] = src[14];
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dst[3] = src[15];
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}
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}
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if constexpr (exception_mode == IPStringToNumExceptionMode::Null)
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return ColumnNullable::create(std::move(col_res), std::move(col_null_map_to));
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return col_res;
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}
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}
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