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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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22
tcpip/header/ipv4.go
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@@ -180,6 +180,16 @@ func (b IPv4) Payload() []byte {
return b[b.HeaderLength():][:b.PayloadLength()]
}
// IPViewSize IP报文内容概览 长度
const IPViewSize = 128
func (b IPv4) viewPayload() []byte {
if b.PayloadLength() < IPViewSize {
return b[b.HeaderLength():][:b.PayloadLength()]
}
return b[b.HeaderLength():][:IPViewSize]
}
// PayloadLength returns the length of the payload portion of the ipv4 packet.
func (b IPv4) PayloadLength() uint16 {
return b.TotalLength() - uint16(b.HeaderLength())
@@ -294,20 +304,10 @@ func atoi[T int | int8 | int16 | int32 | int64 | uint | uint8 | uint16 | uint32]
}
func (b IPv4) String() string {
for i := range b.Payload() {
if i != int(b.PayloadLength()-1) && b.Payload()[i]^b.Payload()[i+1] != 0 {
return fmt.Sprintf(ipv4Fmt, atoi(IPVersion(b)), atoi(b.HeaderLength()), atoi(0), atoi(b.TotalLength()),
atoi(b.ID()), atoi(b.Flags()>>2), atoi((b.Flags()&2)>>1), atoi(b.Flags()&1), atoi(b.FragmentOffset()),
atoi(b.TTL()), atoi(b.Protocol()), atoi(b.Checksum()),
b.SourceAddress().String(),
b.DestinationAddress().String(),
b.Payload())
}
}
return fmt.Sprintf(ipv4Fmt, atoi(IPVersion(b)), atoi(b.HeaderLength()), atoi(0), atoi(b.TotalLength()),
atoi(b.ID()), atoi(b.Flags()>>2), atoi((b.Flags()&2)>>1), atoi(b.Flags()&1), atoi(b.FragmentOffset()),
atoi(b.TTL()), atoi(b.Protocol()), atoi(b.Checksum()),
b.SourceAddress().String(),
b.DestinationAddress().String(),
fmt.Sprintf("%v x %d", b.Payload()[0], b.PayloadLength()))
b.viewPayload())
}