I want to wrap Read function net.Conn.Read(). The purpose of this to read the SSL handshake messages. https://pkg.go.dev/net#TCPConn.Read
nc, err := net.Dial("tcp", "google.com:443")
if err != nil {
fmt.Println(err)
}
tls.Client(nc, &tls.Config{})
Are there any ways to do?
Thanks in advance
Use the following code to intercept Read on a net.Conn:
type wrap {
// Conn is the wrapped net.Conn.
// Because it's an embedded field, the
// net.Conn methods are automatically promoted
// to wrap.
net.Conn
}
// Read calls through to the wrapped read and
// prints the bytes that flow through. Replace
// the print statement with whatever is appropriate
// for your application.
func (w wrap) Read(p []byte) (int, error) {
n, err := w.Conn.Read()
fmt.Printf("%x\n", p[:n]) // example
return n, err
}
Wrap like this:
tnc, err :=tls.Client(wrap{nc}, &tls.Config{})
The previous answer gets the job done indeed.
However I would recommend Liz Rice's talk: GopherCon 2018: Liz Rice - The Go Programmer's Guide to Secure Connections
Going through her code in Github, you might find a more elegant way to achieve what you want.
Start with the client code on line 26.