| /* |
| * Copyright (c) 2021 The WebRTC project authors. All Rights Reserved. |
| * |
| * Use of this source code is governed by a BSD-style license |
| * that can be found in the LICENSE file in the root of the source |
| * tree. An additional intellectual property rights grant can be found |
| * in the file PATENTS. All contributing project authors may |
| * be found in the AUTHORS file in the root of the source tree. |
| */ |
| #include "net/dcsctp/packet/error_cause/missing_mandatory_parameter_cause.h" |
| |
| #include <stddef.h> |
| |
| #include <cstdint> |
| #include <string> |
| #include <type_traits> |
| #include <vector> |
| |
| #include "absl/types/optional.h" |
| #include "api/array_view.h" |
| #include "net/dcsctp/packet/bounded_byte_reader.h" |
| #include "net/dcsctp/packet/bounded_byte_writer.h" |
| #include "net/dcsctp/packet/tlv_trait.h" |
| #include "rtc_base/logging.h" |
| #include "rtc_base/strings/str_join.h" |
| #include "rtc_base/strings/string_builder.h" |
| |
| namespace dcsctp { |
| |
| // https://tools.ietf.org/html/rfc4960#section-3.3.10.2 |
| |
| // +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
| // | Cause Code=2 | Cause Length=8+N*2 | |
| // +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
| // | Number of missing params=N | |
| // +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
| // | Missing Param Type #1 | Missing Param Type #2 | |
| // +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
| // | Missing Param Type #N-1 | Missing Param Type #N | |
| // +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
| constexpr int MissingMandatoryParameterCause::kType; |
| |
| absl::optional<MissingMandatoryParameterCause> |
| MissingMandatoryParameterCause::Parse(rtc::ArrayView<const uint8_t> data) { |
| absl::optional<BoundedByteReader<kHeaderSize>> reader = ParseTLV(data); |
| if (!reader.has_value()) { |
| return absl::nullopt; |
| } |
| |
| uint32_t count = reader->Load32<4>(); |
| if (reader->variable_data_size() / kMissingParameterSize != count) { |
| RTC_DLOG(LS_WARNING) << "Invalid number of missing parameters"; |
| return absl::nullopt; |
| } |
| |
| std::vector<uint16_t> missing_parameter_types; |
| missing_parameter_types.reserve(count); |
| for (uint32_t i = 0; i < count; ++i) { |
| BoundedByteReader<kMissingParameterSize> sub_reader = |
| reader->sub_reader<kMissingParameterSize>(i * kMissingParameterSize); |
| |
| missing_parameter_types.push_back(sub_reader.Load16<0>()); |
| } |
| return MissingMandatoryParameterCause(missing_parameter_types); |
| } |
| |
| void MissingMandatoryParameterCause::SerializeTo( |
| std::vector<uint8_t>& out) const { |
| size_t variable_size = |
| missing_parameter_types_.size() * kMissingParameterSize; |
| BoundedByteWriter<kHeaderSize> writer = AllocateTLV(out, variable_size); |
| |
| writer.Store32<4>(missing_parameter_types_.size()); |
| |
| for (size_t i = 0; i < missing_parameter_types_.size(); ++i) { |
| BoundedByteWriter<kMissingParameterSize> sub_writer = |
| writer.sub_writer<kMissingParameterSize>(i * kMissingParameterSize); |
| |
| sub_writer.Store16<0>(missing_parameter_types_[i]); |
| } |
| } |
| |
| std::string MissingMandatoryParameterCause::ToString() const { |
| rtc::StringBuilder sb; |
| sb << "Missing Mandatory Parameter, missing_parameter_types=" |
| << webrtc::StrJoin(missing_parameter_types_, ","); |
| return sb.Release(); |
| } |
| |
| } // namespace dcsctp |