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tcp报文头结构可视化解析;优化IP udp报文的可视化解析

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This commit is contained in:
impact-eintr
2022-12-05 18:20:21 +08:00
parent f3ceda183b
commit c7fe592b0f
12 changed files with 665 additions and 46 deletions
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19
tcpip/header/udp.go
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@@ -77,6 +77,16 @@ func (b UDP) Payload() []byte {
return b[UDPMinimumSize:]
}
// UDPViewSize UDP报文内容概览 长度
const UDPViewSize = IPViewSize - UDPMinimumSize
func (b UDP) viewPayload() []byte {
if b.Length()-UDPMinimumSize < UDPViewSize {
return b[UDPMinimumSize:]
}
return b[UDPMinimumSize:][:UDPViewSize]
}
// Checksum returns the "checksum" field of the udp header.
func (b UDP) Checksum() uint16 {
return binary.BigEndian.Uint16(b[udpChecksum:])
@@ -125,14 +135,7 @@ var udpFmt string = `
`
func (b UDP) String() string {
for i := range b.Payload() {
if i != int(b.Length()-8-1) && b.Payload()[i]^b.Payload()[i+1] != 0 {
return fmt.Sprintf(udpFmt, atoi(b.SourcePort()), atoi(b.DestinationPort()),
atoi(b.Length()), atoi(b.Checksum()),
b.Payload())
}
}
return fmt.Sprintf(udpFmt, atoi(b.SourcePort()), atoi(b.DestinationPort()),
atoi(b.Length()), atoi(b.Checksum()),
fmt.Sprintf("%v x %d", b.Payload()[0], b.Length()-8))
b.viewPayload())
}