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Fix missing bypass and update README

master v0.3.0
Ambrose Chua 2 years ago
parent
commit
eefbd63e5a
Signed by: ambrose GPG Key ID: B34FBE029276BA5D
  1. 10
      README.md
  2. 70
      server.go

10
README.md

@ -9,11 +9,17 @@ A simple TCP proxy. Currently used in [AppVenture](https://appventure.nushigh.ed
$ ./forward -help
Usage of ./forward:
-connect string
forward to ip and port (default ":8080")
forward to address
-listen string
listen on ip and port (default ":8081")
listen on address (default ":8000")
-ssh string
if set, will do basic introspection to forward SSH traffic to this address
```
### Usage with SSH
You can use `forward` to do multiplexing of SSH and HTTP in a quick and dirty way, using very simple protocol introspection. A more robust solution would be [sshttp](https://github.com/stealth/sshttp)
## Usage on Windows
`forward` is wrapped with [go-svc](https://github.com/judwhite/go-svc), enabling it to be run as a Windows service. To add with PowerShell:

70
server.go

@ -70,37 +70,53 @@ var magic = []byte{'S', 'S', 'H', '-'}
var magicLen = len(magic)
func handle(c net.Conn, count int) {
// read first four characters
readMagic := make([]byte, magicLen, magicLen)
n, err := c.Read(readMagic)
if n != magicLen {
log.Printf("warning! could not read header")
return
}
opError, ok := err.(*net.OpError)
if err != nil && (!ok || opError.Op != "readfrom") {
log.Printf("warning! %v", err)
return
}
if connSSH != nil {
connTo := conn
// if the header looks like SSH, forward to SSH connection
if bytes.Equal(readMagic, magic) {
connTo = connSSH
}
// read first four characters
readMagic := make([]byte, magicLen, magicLen)
n, err := c.Read(readMagic)
if n != magicLen {
log.Printf("warning! could not read header")
return
}
opError, ok := err.(*net.OpError)
if err != nil && (!ok || opError.Op != "readfrom") {
log.Printf("warning! %v", err)
return
}
cn, err := net.DialTCP("tcp", nil, connTo)
if err != nil {
c.Close()
log.Print(err)
return
}
connTo := conn
// if the header looks like SSH, forward to SSH connection
if bytes.Equal(readMagic, magic) {
connTo = connSSH
}
// write the first four characters
cn.Write(readMagic)
cn, err := net.DialTCP("tcp", nil, connTo)
if err != nil {
c.Close()
log.Print(err)
return
}
// write the first four characters
cn.Write(readMagic)
go pipe(c, cn, count)
go pipe(cn, c, count)
} else {
go pipe(c, cn, count)
go pipe(cn, c, count)
cn, err := net.DialTCP("tcp", nil, conn)
if err != nil {
c.Close()
log.Print(err)
return
}
go pipe(c, cn, count)
go pipe(cn, c, count)
}
}
func pipe(w io.WriteCloser, r io.ReadCloser, count int) {

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