93 lines
2.9 KiB
Go
93 lines
2.9 KiB
Go
package utils
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import (
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"log"
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"github.com/google/gopacket"
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"client/structs"
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)
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func (c*SocketCall) BuildFileTransferPacket(Header structs.SaprusHeaderFrame,
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Data structs.SaprusFileTransfer) gopacket.SerializeBuffer {
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eth, ip, udp := basePacket(c)
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sapHeader := structs.SaprusHeaderFrame {
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PacketType: Header.PacketType,
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Length: c.saprusPayloadLength(Data.Bytes()),
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Payload: Data.Bytes(),
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}
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buf := gopacket.NewSerializeBuffer()
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opts := gopacket.SerializeOptions {
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ComputeChecksums: true,
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FixLengths: true,
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}
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udp.SetNetworkLayerForChecksum(&ip)
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err := gopacket.SerializeLayers(buf, opts, ð, &ip, &udp, gopacket.Payload(sapHeader.Bytes()))
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if err != nil {
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log.Panic(err)
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}
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return buf
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}
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func (c* SocketCall) FileTransferPacket(message string, seqNum uint16) gopacket.SerializeBuffer {
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sapFile := structs.SaprusFileTransfer {
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Flag: [1]byte{0x11},
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Sequence: [2]byte{byte(seqNum >> 8), byte(seqNum & 0xFF)},
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Checksum: [2]byte{0x44, 0x44},
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Payload: []byte(message),
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}
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sapHeader := structs.SaprusHeaderFrame {
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PacketType: [2]byte{0x88, 0x88},
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Length: c.saprusPayloadLength(sapFile.Bytes()),
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Payload: sapFile.Bytes(),
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}
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buf := c.BuildFileTransferPacket(sapHeader, sapFile)
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return buf
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}
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func (c* SocketCall) InitFileTransferPacket() gopacket.SerializeBuffer {
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sapFile := structs.SaprusFileTransfer {
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Flag: [1]byte{0x01},
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Sequence: [2]byte{0x00, 0x00},
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Checksum: [2]byte{0x00, 0x00},
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Payload: []byte{},
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}
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sapHeader := structs.SaprusHeaderFrame {
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PacketType: [2]byte{0x00, 0x00},
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Length: c.saprusPayloadLength(sapFile.Bytes()),
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Payload: sapFile.Bytes(),
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}
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buf := c.BuildFileTransferPacket(sapHeader, sapFile)
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return buf
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}
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func (c* SocketCall) EndFileTransferPacket() gopacket.SerializeBuffer {
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sapFile := structs.SaprusFileTransfer {
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Flag: [1]byte{0x02},
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Sequence: [2]byte{0x00, 0x00},
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Checksum: [2]byte{0x00, 0x00},
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Payload: []byte{},
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}
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sapHeader := structs.SaprusHeaderFrame {
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PacketType: [2]byte{0x00, 0x00},
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Length: c.saprusPayloadLength(sapFile.Bytes()),
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Payload: sapFile.Bytes(),
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}
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buf := c.BuildFileTransferPacket(sapHeader, sapFile)
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return buf
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}
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