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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,45 @@ | ||
| package mobile | ||
|
|
||
| import ( | ||
| "github.com/mythologyli/zju-connect/client" | ||
| "github.com/mythologyli/zju-connect/log" | ||
| "github.com/mythologyli/zju-connect/stack/tun" | ||
| ) | ||
|
|
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| var vpnClient *client.EasyConnectClient | ||
|
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| func Login(server string, username string, password string) string { | ||
| log.Init() | ||
|
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| vpnClient = client.NewEasyConnectClient( | ||
| server, | ||
| username, | ||
| password, | ||
| "", | ||
| false, | ||
| false, | ||
| ) | ||
| err := vpnClient.Setup() | ||
| if err != nil { | ||
| return "" | ||
| } | ||
|
|
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| log.Printf("EasyConnect client started") | ||
|
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| clientIP, err := vpnClient.IP() | ||
| if err != nil { | ||
| return "" | ||
| } | ||
|
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| return clientIP.String() | ||
| } | ||
|
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| func StartStack(fd int) { | ||
| vpnTUNStack, err := tun.NewStack(vpnClient, "") | ||
| if err != nil { | ||
| return | ||
| } | ||
|
|
||
| vpnTUNStack.SetupTun(fd) | ||
| vpnTUNStack.Run() | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,155 @@ | ||
| package tun | ||
|
|
||
| import ( | ||
| "context" | ||
| "github.com/mythologyli/zju-connect/client" | ||
| "github.com/mythologyli/zju-connect/log" | ||
| "golang.org/x/net/ipv4" | ||
| "io" | ||
| "net" | ||
| "os" | ||
| "syscall" | ||
| ) | ||
|
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| type Stack struct { | ||
| endpoint *Endpoint | ||
| rvpnConn io.ReadWriteCloser | ||
| } | ||
|
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| func (s *Stack) Run() { | ||
| var err error | ||
| s.rvpnConn, err = client.NewRvpnConn(s.endpoint.easyConnectClient) | ||
| if err != nil { | ||
| log.Printf("Error occurred while creating sendConn: %v", err) | ||
| return | ||
| } | ||
|
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| ctxRead, cancelRead := context.WithCancel(context.Background()) | ||
| ctxWrite, cancelWrite := context.WithCancel(context.Background()) | ||
|
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| // Read from VPN server and send to TUN stack | ||
| go func() { | ||
| for { | ||
| select { | ||
| case <-ctxRead.Done(): | ||
| cancelWrite() | ||
| return | ||
| default: | ||
| buf := make([]byte, 1500) | ||
| n, err := s.rvpnConn.Read(buf) | ||
| if err != nil { | ||
| cancelWrite() | ||
| return | ||
| } | ||
|
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| log.DebugPrintf("Recv: read %d bytes", n) | ||
| log.DebugDumpHex(buf[:n]) | ||
|
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| err = s.endpoint.Write(buf[:n]) | ||
| if err != nil { | ||
| log.Printf("Error occurred while writing to TUN stack: %v", err) | ||
| cancelWrite() | ||
| return | ||
| } | ||
| } | ||
| } | ||
| }() | ||
|
|
||
| // Read from TUN stack and send to VPN server | ||
| for { | ||
| select { | ||
| case <-ctxWrite.Done(): | ||
| cancelRead() | ||
| return | ||
| default: | ||
| buf := make([]byte, 1500) | ||
| n, err := s.endpoint.Read(buf) | ||
| if err != nil { | ||
| log.Printf("Error occurred while reading from TUN stack: %v", err) | ||
| cancelRead() | ||
| return | ||
| } | ||
|
|
||
| if n < 20 { | ||
| continue | ||
| } | ||
|
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| header, err := ipv4.ParseHeader(buf[:n]) | ||
| if err != nil { | ||
| continue | ||
| } | ||
|
|
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| // Filter out non-TCP/UDP packets otherwise error may occur | ||
| if header.Protocol != syscall.IPPROTO_TCP && header.Protocol != syscall.IPPROTO_UDP { | ||
| continue | ||
| } | ||
|
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| _, err = s.rvpnConn.Write(buf[:n]) | ||
| if err != nil { | ||
| cancelRead() | ||
| return | ||
| } | ||
|
|
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| log.DebugPrintf("Send: wrote %d bytes", n) | ||
| log.DebugDumpHex(buf[:n]) | ||
| } | ||
| } | ||
| } | ||
|
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| type Endpoint struct { | ||
| easyConnectClient *client.EasyConnectClient | ||
|
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| readWriteCloser io.ReadWriteCloser | ||
| ip net.IP | ||
|
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| tcpDialer *net.Dialer | ||
| udpDialer *net.Dialer | ||
| } | ||
|
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| func (ep *Endpoint) Write(buf []byte) error { | ||
| _, err := ep.readWriteCloser.Write(buf) | ||
| return err | ||
| } | ||
|
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| func (ep *Endpoint) Read(buf []byte) (int, error) { | ||
| return ep.readWriteCloser.Read(buf) | ||
| } | ||
|
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| func (s *Stack) AddRoute(target string) error { | ||
| return nil | ||
| } | ||
|
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| func NewStack(easyConnectClient *client.EasyConnectClient, dnsServer string) (*Stack, error) { | ||
| s := &Stack{} | ||
|
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| s.endpoint = &Endpoint{ | ||
| easyConnectClient: easyConnectClient, | ||
| } | ||
|
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| var err error | ||
| s.endpoint.ip, err = easyConnectClient.IP() | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
|
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| // We need this dialer to bind to device otherwise packets will not be sent via TUN | ||
| s.endpoint.tcpDialer = &net.Dialer{ | ||
| LocalAddr: &net.TCPAddr{ | ||
| IP: s.endpoint.ip, | ||
| Port: 0, | ||
| }, | ||
| } | ||
|
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| s.endpoint.udpDialer = &net.Dialer{ | ||
| LocalAddr: &net.UDPAddr{ | ||
| IP: s.endpoint.ip, | ||
| Port: 0, | ||
| }, | ||
| } | ||
|
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| return s, nil | ||
| } | ||
|
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| func (s *Stack) SetupTun(fd int) { | ||
| s.endpoint.readWriteCloser = os.NewFile(uintptr(fd), "tun") | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,3 +1,5 @@ | ||
| //go:build !android | ||
|
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| package tun | ||
|
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| import ( | ||
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||