diff options
Diffstat (limited to 'include/wireframe/net/tcp.hpp')
| -rw-r--r-- | include/wireframe/net/tcp.hpp | 54 |
1 files changed, 0 insertions, 54 deletions
diff --git a/include/wireframe/net/tcp.hpp b/include/wireframe/net/tcp.hpp deleted file mode 100644 index f691a7f..0000000 --- a/include/wireframe/net/tcp.hpp +++ /dev/null @@ -1,54 +0,0 @@ -#pragma once - -#include <cstdint> -#include <optional> -#include <span> - -#include "wireframe/byteio.hpp" - -namespace wireframe::net { - -// Lower 6 bits of the flags byte: URG ACK PSH RST SYN FIN. CWR/ECE (the -// top 2 bits) are masked off - not needed for now. -inline constexpr std::uint8_t kTcpFin = 0x01; -inline constexpr std::uint8_t kTcpSyn = 0x02; -inline constexpr std::uint8_t kTcpRst = 0x04; -inline constexpr std::uint8_t kTcpPsh = 0x08; -inline constexpr std::uint8_t kTcpAck = 0x10; -inline constexpr std::uint8_t kTcpUrg = 0x20; - -struct TcpHeader { - std::uint16_t src_port; - std::uint16_t dst_port; - std::uint32_t seq; - std::uint32_t ack; - std::uint8_t data_offset; // header length in 32-bit words - std::uint8_t flags; - std::uint16_t window; -}; - -struct TcpSegment { - TcpHeader header; - std::span<const unsigned char> payload; -}; - -inline std::optional<TcpSegment> parse_tcp(std::span<const unsigned char> bytes) { - if (bytes.size() < 20) return std::nullopt; - - std::uint8_t data_offset = static_cast<std::uint8_t>(bytes[12] >> 4); - std::size_t header_len = static_cast<std::size_t>(data_offset) * 4; - if (header_len < 20 || bytes.size() < header_len) return std::nullopt; - - TcpHeader header{}; - header.src_port = read_be16(bytes, 0); - header.dst_port = read_be16(bytes, 2); - header.seq = read_be32(bytes, 4); - header.ack = read_be32(bytes, 8); - header.data_offset = data_offset; - header.flags = bytes[13] & 0x3F; - header.window = read_be16(bytes, 14); - - return TcpSegment{header, bytes.subspan(header_len)}; -} - -} // namespace wireframe::net |