protocols

package
v1.0.0 Latest Latest
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 Go to latest Published: Oct 3, 2025 License: MIT Imports: 9 Imported by: 0

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Index

Constants

This section is empty.

Variables

View Source 
var PNGSignature = []byte{137, 80, 78, 71, 13, 10, 26, 10}

PNGSignature represents the PNG file signature

Functions

func BuildIPv4Header 

func BuildIPv4Header(header IPv4Header) (*bitstring.BitString, error)

BuildIPv4Header creates an IPv4 header from a structure

func BuildNetworkPacket 

func BuildNetworkPacket(packet NetworkPacket) (*bitstring.BitString, error)

BuildNetworkPacket creates a network packet from a structure

func BuildPNGChunk 

func BuildPNGChunk(chunk PNGChunk) ([]byte, error)

BuildPNGChunk creates a PNG chunk from a structure

func BuildPNGHeader 

func BuildPNGHeader(header PNGHeader) (*bitstring.BitString, error)

BuildPNGHeader creates a PNG header from a structure

func BuildTCPFlags 

func BuildTCPFlags(flags TCPFlags) (*bitstring.BitString, error)

BuildTCPFlags creates TCP flags from a structure

func BuildTCPHeader 

func BuildTCPHeader(header TCPHeader) (*bitstring.BitString, error)

BuildTCPHeader creates a complete TCP header from a structure

func FormatIPAddress 

func FormatIPAddress(ip uint32) string

FormatIPAddress formats an IP address from uint32 to string

func FormatNetworkPacketInfo 

func FormatNetworkPacketInfo(packet *NetworkPacket) string

FormatNetworkPacketInfo formats network packet information for output

func FormatPNGIHDRInfo 

func FormatPNGIHDRInfo(ihdr *PNGIHDRChunk) string

FormatPNGIHDRInfo formats IHDR chunk information for output

func GetIPv4HeaderLength 

func GetIPv4HeaderLength(header *IPv4Header) uint

GetIPv4HeaderLength returns the header length in bytes

func GetIPv4PayloadLength 

func GetIPv4PayloadLength(header *IPv4Header) uint

GetIPv4PayloadLength returns the payload length in bytes

func GetPNGColorTypeName 

func GetPNGColorTypeName(colorType uint8) string

GetPNGColorTypeName returns the color type name

func GetPNGInterlaceMethodName 

func GetPNGInterlaceMethodName(interlace uint8) string

GetPNGInterlaceMethodName returns the interlace method name

func GetTCPFlagsString 

func GetTCPFlagsString(flags TCPFlags) string

GetTCPFlagsString returns a string representation of set flags

func GetTCPHeaderLength 

func GetTCPHeaderLength(header *TCPHeader) uint

GetTCPHeaderLength returns the TCP header length in bytes

func IsTCPConnectionEstablished 

func IsTCPConnectionEstablished(flags TCPFlags) bool

IsTCPConnectionEstablished checks if the packet is a connection establishment confirmation (SYN+ACK)

func IsTCPConnectionEstablishment 

func IsTCPConnectionEstablishment(flags TCPFlags) bool

IsTCPConnectionEstablishment checks if the packet is a connection establishment (SYN)

func IsTCPConnectionTermination 

func IsTCPConnectionTermination(flags TCPFlags) bool

IsTCPConnectionTermination checks if the packet is a connection termination (FIN or RST)

func IsTCPDataPacket 

func IsTCPDataPacket(flags TCPFlags) bool

IsTCPDataPacket checks if the packet contains data (PSH and ACK)

func ParseIPAddress 

func ParseIPAddress(ipStr string) (uint32, error)

ParseIPAddress parses an IP address from string to uint32

func ValidateIPv4Header 

func ValidateIPv4Header(header *IPv4Header) error

ValidateIPv4Header performs full validation of an IPv4 header

func ValidateNetworkPacket 

func ValidateNetworkPacket(packet *NetworkPacket) error

ValidateNetworkPacket performs full validation of a network packet

func ValidatePNGChunk 

func ValidatePNGChunk(chunk *PNGChunk) error

ValidatePNGChunk performs PNG chunk validation

func ValidatePNGHeader 

func ValidatePNGHeader(header *PNGHeader) error

ValidatePNGHeader performs PNG header validation

func ValidatePNGIHDRChunk 

func ValidatePNGIHDRChunk(ihdr *PNGIHDRChunk) error

ValidatePNGIHDRChunk performs IHDR chunk validation

func ValidateTCPFlags 

func ValidateTCPFlags(flags *TCPFlags) error

ValidateTCPFlags performs validation of TCP flags

func ValidateTCPHeader 

func ValidateTCPHeader(header *TCPHeader) error

ValidateTCPHeader performs full validation of a TCP header

Types

type IPv4Header 

type IPv4Header struct {
	Version        uint // Version (4 bits)
	HeaderLength   uint // Header length (4 bits)
	ServiceType    uint // Service type (8 bits)
	TotalLength    uint // Total length (16 bits)
	Identification uint // Identification (16 bits)
	Flags          uint // Flags (3 bits)
	FragmentOffset uint // Fragment offset (13 bits)
	TTL            uint // Time to live (8 bits)
	Protocol       uint // Protocol (8 bits)
	Checksum       uint // Checksum (16 bits)
	SourceIP       uint // Source IP address (32 bits)
	DestinationIP  uint // Destination IP address (32 bits)
}

IPv4Header represents the structure of an IPv4 header

func ParseIPv4Header 

func ParseIPv4Header(data *bitstring.BitString) (*IPv4Header, error)

ParseIPv4Header parses an IPv4 header from a bitstring

type NetworkPacket 

type NetworkPacket struct {
	IPv4Header IPv4Header
	TCPHeader  TCPHeader
	Payload    []byte
}

NetworkPacket represents a network packet with IPv4 and TCP headers

func CreateHTTPPacket 

func CreateHTTPPacket(srcIP, dstIP string, srcPort, dstPort uint16, method, path, host string) (*NetworkPacket, error)

CreateHTTPPacket creates an HTTP request packet

func CreateTCPSynPacket 

func CreateTCPSynPacket(srcIP, dstIP string, srcPort, dstPort uint16) (*NetworkPacket, error)

CreateTCPSynPacket creates a TCP SYN packet for connection establishment

func ParseNetworkPacket 

func ParseNetworkPacket(data *bitstring.BitString) (*NetworkPacket, error)

ParseNetworkPacket parses a network packet from a bitstring

type PNGChunk 

type PNGChunk struct {
	Length uint32 // Chunk data length (4 bytes)
	Type   []byte // Chunk type (4 bytes)
	Data   []byte // Chunk data (variable length)
	CRC    uint32 // CRC32 checksum (4 bytes)
}

PNGChunk represents the structure of a PNG chunk

func BuildPNGIHDRChunk 

func BuildPNGIHDRChunk(ihdr PNGIHDRChunk) (PNGChunk, error)

BuildPNGIHDRChunk creates an IHDR chunk from a structure

func ParsePNGChunk 

func ParsePNGChunk(data []byte) (PNGChunk, uint, error)

ParsePNGChunk parses a PNG chunk from bytes

type PNGHeader 

type PNGHeader struct {
	Signature []byte     // PNG signature (8 bytes)
	Chunks    []PNGChunk // PNG chunks
}

PNGHeader represents the structure of a PNG header

func ParsePNGHeader 

func ParsePNGHeader(data *bitstring.BitString) (*PNGHeader, error)

ParsePNGHeader parses a PNG header from a bitstring

type PNGIHDRChunk 

type PNGIHDRChunk struct {
	Width       uint32 // Image width (4 bytes)
	Height      uint32 // Image height (4 bytes)
	BitDepth    uint8  // Color depth (1 byte)
	ColorType   uint8  // Color type (1 byte)
	Compression uint8  // Compression method (1 byte)
	Filter      uint8  // Filter method (1 byte)
	Interlace   uint8  // Interlace method (1 byte)
}

PNGIHDRChunk represents the IHDR chunk of PNG (image header)

func ParsePNGIHDRChunk 

func ParsePNGIHDRChunk(data []byte) (*PNGIHDRChunk, error)

ParsePNGIHDRChunk parses an IHDR chunk from data

type TCPFlags 

type TCPFlags struct {
	Reserved uint // Reserved bits (2 bits)
	URG      uint // Urgent flag (1 bit)
	ACK      uint // Acknowledgment flag (1 bit)
	PSH      uint // Push flag (1 bit)
	RST      uint // Reset flag (1 bit)
	SYN      uint // Synchronize flag (1 bit)
	FIN      uint // Finish flag (1 bit)
}

TCPFlags represents the structure of TCP flags

func ParseTCPFlags 

func ParseTCPFlags(data *bitstring.BitString) (*TCPFlags, error)

ParseTCPFlags parses TCP flags from a bitstring

type TCPHeader 

type TCPHeader struct {
	SourcePort      uint     // Source port (16 bits)
	DestinationPort uint     // Destination port (16 bits)
	SequenceNumber  uint     // Sequence number (32 bits)
	Acknowledgment  uint     // Acknowledgment number (32 bits)
	DataOffset      uint     // Data offset (4 bits)
	Reserved        uint     // Reserved (3 bits)
	Flags           TCPFlags // Flags (9 bits: 2 reserved + 7 flags)
	Window          uint     // Window size (16 bits)
	Checksum        uint     // Checksum (16 bits)
	UrgentPointer   uint     // Urgent pointer (16 bits)
}

TCPHeader represents a complete TCP header

func ParseTCPHeader 

func ParseTCPHeader(data *bitstring.BitString) (*TCPHeader, error)

ParseTCPHeader parses a complete TCP header from a bitstring

Source Files

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