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Copy pathtcp_mac_and_win.go
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334 lines (265 loc) · 9.45 KB
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//go:build darwin || windows
// +build darwin windows
// TODO: linux の方のコードとなるべく共通化
package packemon
import (
"bytes"
"context"
"fmt"
"github.com/gopacket/gopacket"
"github.com/gopacket/gopacket/layers"
)
// このなかで、ログ出力などしないこと。Monitor の下に出てくる
// 挙動を詳細に確認する場合は、internal内の SendTCP3wayhandshake 関数でやること
// TODO: 対向からRST,RST/ACKが来た時にreturnするようにする
func EstablishConnectionAndSendPayloadXxx(ctx context.Context, nwInterface string, fEthrh *EthernetHeader, fIpv4 *IPv4, fTcp *TCP, upperLayerData []byte) error {
nw, err := NewNetworkInterface(nwInterface)
if err != nil {
return err
}
var srcIPAddr uint32 = fIpv4.SrcAddr
var dstIPAddr uint32 = fIpv4.DstAddr
dstMACAddr := fEthrh.Dst
srcMACAddr := fEthrh.Src
tcpConn := NewTCPConnection(fTcp.SrcPort, fTcp.DstPort)
tcp := NewTCPSyn(tcpConn.SrcPort, tcpConn.DstPort)
ipv4 := NewIPv4(IPv4_PROTO_TCP, srcIPAddr, dstIPAddr)
tcp.CalculateChecksum(ipv4)
ipv4.Data = tcp.Bytes()
ipv4.CalculateTotalLength()
ipv4.CalculateChecksum()
ethernetFrame := NewEthernetFrame(dstMACAddr, srcMACAddr, ETHER_TYPE_IPv4, ipv4.Bytes())
if err := nw.Send(ethernetFrame); err != nil {
return err
}
tcpConn.SetState(TCP_STATE_3WAY_HANDSHAKE_SEND_SYN)
packetSource := gopacket.NewPacketSource(nw.Handle, layers.LayerTypeEthernet)
packets := packetSource.Packets()
for {
select {
case <-ctx.Done():
return fmt.Errorf("timeout!")
case packet := <-packets:
if packet == nil {
continue
}
received := packet.Data()
if len(received) < 14 { // Minimum Ethernet frame size
continue
}
ethernetFrame := ParsedEthernetFrame(received)
if ethernetFrame.Header.Typ != ETHER_TYPE_IPv4 {
continue
}
ipv4 := ParsedIPv4(ethernetFrame.Data)
if ipv4.Protocol != IPv4_PROTO_TCP {
continue
}
tcp := ParsedTCP(ipv4.Data)
if tcpConn.IsPassiveSynAckForHandshake(tcp) {
// log.Println("passive TCP_FLAGS_SYN_ACK")
// syn/ackを受け取ったのでack送信
tcp := NewTCPAck(tcpConn.SrcPort, tcpConn.DstPort, tcp.Sequence, tcp.Acknowledgment)
ipv4 := NewIPv4(IPv4_PROTO_TCP, srcIPAddr, dstIPAddr)
tcp.CalculateChecksum(ipv4)
ipv4.Data = tcp.Bytes()
ipv4.CalculateTotalLength()
ipv4.CalculateChecksum()
ethernetFrame := NewEthernetFrame(dstMACAddr, srcMACAddr, ETHER_TYPE_IPv4, ipv4.Bytes())
if err := nw.Send(ethernetFrame); err != nil {
return err
}
tcpConn.EstablishedConnection()
tcp = NewTCPWithData(tcpConn.SrcPort, tcpConn.DstPort, upperLayerData, tcp.Sequence, tcp.Acknowledgment)
ipv4 = NewIPv4(IPv4_PROTO_TCP, srcIPAddr, dstIPAddr)
tcp.CalculateChecksum(ipv4)
ipv4.Data = tcp.Bytes()
ipv4.CalculateTotalLength()
ipv4.CalculateChecksum()
ethernetFrame = NewEthernetFrame(dstMACAddr, srcMACAddr, ETHER_TYPE_IPv4, ipv4.Bytes())
if err := nw.Send(ethernetFrame); err != nil {
return err
}
continue
}
if tcpConn.IsPassiveAck(tcp) {
// log.Println("passive TCP_FLAGS_ACK")
continue
}
if tcpConn.IsPassivePshAck(tcp) {
lineLength := bytes.Index(tcp.Data, []byte{0x0d, 0x0a}) // "\r\n"
if lineLength == -1 {
// log.Println("-1")
continue
}
// log.Println("passive TCP_FLAGS_PSH_ACK")
// HTTPレスポンス受信
if tcp.SrcPort == PORT_HTTP {
resp := ParsedHTTPResponse(tcp.Data)
// log.Printf("%+v\n", resp)
// そのackを返す
tcp := NewTCPAckForPassiveData(tcpConn.SrcPort, tcpConn.DstPort, tcp.Sequence, tcp.Acknowledgment, resp.Len())
ipv4 := NewIPv4(IPv4_PROTO_TCP, srcIPAddr, dstIPAddr)
tcp.CalculateChecksum(ipv4)
ipv4.Data = tcp.Bytes()
ipv4.CalculateTotalLength()
ipv4.CalculateChecksum()
ethernetFrame := NewEthernetFrame(dstMACAddr, srcMACAddr, ETHER_TYPE_IPv4, ipv4.Bytes())
if err := nw.Send(ethernetFrame); err != nil {
return err
}
// 続けてFinAck
tcp = NewTCPFinAck(tcpConn.SrcPort, tcpConn.DstPort, tcp.Sequence, tcp.Acknowledgment)
ipv4 = NewIPv4(IPv4_PROTO_TCP, srcIPAddr, dstIPAddr)
tcp.CalculateChecksum(ipv4)
ipv4.Data = tcp.Bytes()
ipv4.CalculateTotalLength()
ipv4.CalculateChecksum()
ethernetFrame = NewEthernetFrame(dstMACAddr, srcMACAddr, ETHER_TYPE_IPv4, ipv4.Bytes())
if err := nw.Send(ethernetFrame); err != nil {
return err
}
}
continue
}
if tcpConn.IsPassiveFinAck(tcp) {
// log.Println("passive TCP_FLAGS_FIN_ACK")
// それにack
tcp := NewTCPAck(tcpConn.SrcPort, tcpConn.DstPort, tcp.Sequence, tcp.Acknowledgment)
ipv4 := NewIPv4(IPv4_PROTO_TCP, srcIPAddr, dstIPAddr)
tcp.CalculateChecksum(ipv4)
ipv4.Data = tcp.Bytes()
ipv4.CalculateTotalLength()
ipv4.CalculateChecksum()
ethernetFrame := NewEthernetFrame(dstMACAddr, srcMACAddr, ETHER_TYPE_IPv4, ipv4.Bytes())
if err := nw.Send(ethernetFrame); err != nil {
return err
}
tcpConn.Close()
return nil
}
continue
}
}
}
func EstablishConnectionAndSendPayloadXxxForIPv6(ctx context.Context, nwInterface string, fEthrh *EthernetHeader, fIpv6 *IPv6, fTcp *TCP, upperLayerData []byte) error {
nw, err := NewNetworkInterface(nwInterface)
if err != nil {
return err
}
var srcIPAddr []uint8 = fIpv6.SrcAddr
var dstIPAddr []uint8 = fIpv6.DstAddr
dstMACAddr := fEthrh.Dst
srcMACAddr := fEthrh.Src
tcpConn := NewTCPConnection(fTcp.SrcPort, fTcp.DstPort)
tcp := NewTCPSyn(tcpConn.SrcPort, tcpConn.DstPort)
ipv6 := NewIPv6(IPv4_PROTO_TCP, srcIPAddr, dstIPAddr)
tcp.CalculateChecksumForIPv6(ipv6)
ipv6.Data = tcp.Bytes()
ipv6.PayloadLength = uint16(len(ipv6.Data))
ethernetFrame := NewEthernetFrame(dstMACAddr, srcMACAddr, ETHER_TYPE_IPv6, ipv6.Bytes())
if err := nw.Send(ethernetFrame); err != nil {
return err
}
tcpConn.SetState(TCP_STATE_3WAY_HANDSHAKE_SEND_SYN)
packetSource := gopacket.NewPacketSource(nw.Handle, layers.LayerTypeEthernet)
packets := packetSource.Packets()
for {
select {
case <-ctx.Done():
return fmt.Errorf("timeout!")
case packet := <-packets:
if packet == nil {
continue
}
received := packet.Data()
if len(received) < 14 { // Minimum Ethernet frame size
continue
}
ethernetFrame := ParsedEthernetFrame(received)
if ethernetFrame.Header.Typ != ETHER_TYPE_IPv6 {
continue
}
ipv6 := ParsedIPv6(ethernetFrame.Data)
if ipv6.NextHeader != IPv4_PROTO_TCP {
continue
}
tcp := ParsedTCP(ipv6.Data)
if tcpConn.IsPassiveSynAckForHandshake(tcp) {
// syn/ackを受け取ったのでack送信
tcp := NewTCPAck(tcpConn.SrcPort, tcpConn.DstPort, tcp.Sequence, tcp.Acknowledgment)
ipv6 := NewIPv6(IPv4_PROTO_TCP, srcIPAddr, dstIPAddr)
tcp.CalculateChecksumForIPv6(ipv6)
ipv6.Data = tcp.Bytes()
ipv6.PayloadLength = uint16(len(ipv6.Data))
ethernetFrame := NewEthernetFrame(dstMACAddr, srcMACAddr, ETHER_TYPE_IPv6, ipv6.Bytes())
if err := nw.Send(ethernetFrame); err != nil {
return err
}
tcpConn.EstablishedConnection()
tcp = NewTCPWithData(tcpConn.SrcPort, tcpConn.DstPort, upperLayerData, tcp.Sequence, tcp.Acknowledgment)
ipv6 = NewIPv6(IPv6_NEXT_HEADER_TCP, srcIPAddr, dstIPAddr)
tcp.CalculateChecksumForIPv6(ipv6)
ipv6.Data = tcp.Bytes()
ipv6.PayloadLength = uint16(len(ipv6.Data))
ethernetFrame = NewEthernetFrame(dstMACAddr, srcMACAddr, ETHER_TYPE_IPv6, ipv6.Bytes())
if err := nw.Send(ethernetFrame); err != nil {
return err
}
continue
}
if tcpConn.IsPassiveAck(tcp) {
continue
}
if tcpConn.IsPassivePshAck(tcp) {
lineLength := bytes.Index(tcp.Data, []byte{0x0d, 0x0a}) // "\r\n"
if lineLength == -1 {
// log.Println("-1")
continue
}
// log.Println("passive TCP_FLAGS_PSH_ACK")
// HTTPレスポンス受信
if tcp.SrcPort == PORT_HTTP {
resp := ParsedHTTPResponse(tcp.Data)
// log.Printf("%+v\n", resp)
// そのackを返す
// log.Printf("Length of http resp: %d\n", resp.Len())
tcp := NewTCPAckForPassiveData(tcpConn.SrcPort, tcpConn.DstPort, tcp.Sequence, tcp.Acknowledgment, resp.Len())
ipv6 := NewIPv6(IPv6_NEXT_HEADER_TCP, srcIPAddr, dstIPAddr)
tcp.CalculateChecksumForIPv6(ipv6)
ipv6.Data = tcp.Bytes()
ipv6.PayloadLength = uint16(len(ipv6.Data))
ethernetFrame := NewEthernetFrame(dstMACAddr, srcMACAddr, ETHER_TYPE_IPv6, ipv6.Bytes())
if err := nw.Send(ethernetFrame); err != nil {
return err
}
// 続けてFinAck
tcp = NewTCPFinAck(tcpConn.SrcPort, tcpConn.DstPort, tcp.Sequence, tcp.Acknowledgment)
ipv6 = NewIPv6(IPv6_NEXT_HEADER_TCP, srcIPAddr, dstIPAddr)
tcp.CalculateChecksumForIPv6(ipv6)
ipv6.Data = tcp.Bytes()
ipv6.PayloadLength = uint16(len(ipv6.Data))
ethernetFrame = NewEthernetFrame(dstMACAddr, srcMACAddr, ETHER_TYPE_IPv6, ipv6.Bytes())
if err := nw.Send(ethernetFrame); err != nil {
return err
}
}
continue
}
if tcpConn.IsPassiveFinAck(tcp) {
// それにack
tcp := NewTCPAck(tcpConn.SrcPort, tcpConn.DstPort, tcp.Sequence, tcp.Acknowledgment)
ipv6 := NewIPv6(IPv6_NEXT_HEADER_TCP, srcIPAddr, dstIPAddr)
tcp.CalculateChecksumForIPv6(ipv6)
ipv6.Data = tcp.Bytes()
ipv6.PayloadLength = uint16(len(ipv6.Data))
ethernetFrame := NewEthernetFrame(dstMACAddr, srcMACAddr, ETHER_TYPE_IPv6, ipv6.Bytes())
if err := nw.Send(ethernetFrame); err != nil {
return err
}
tcpConn.Close()
return nil
}
}
}
}