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refactor: move CreateForwardedTCPIPPayload to forwarder interface

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This commit is contained in:
bagas
2025-12-05 13:49:33 +07:00
parent 7a31047bb9
commit 659f6c3ee7
7 changed files with 36 additions and 82 deletions
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48
session/forwarder/forwarder.go
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@ -37,6 +37,7 @@ type ForwardingController interface {
Close() error
HandleConnection(dst io.ReadWriter, src ssh.Channel, remoteAddr net.Addr)
SetLifecycle(lifecycle Lifecycle)
CreateForwardedTCPIPPayload(origin net.Addr) []byte
}
func (f *Forwarder) SetLifecycle(lifecycle Lifecycle) {
@ -53,8 +54,7 @@ func (f *Forwarder) AcceptTCPConnections() {
log.Printf("Error accepting connection: %v", err)
continue
}
originHost, originPort := ParseAddr(conn.RemoteAddr().String())
payload := createForwardedTCPIPPayload(originHost, uint16(originPort), f.GetForwardedPort())
payload := f.CreateForwardedTCPIPPayload(conn.RemoteAddr())
channel, reqs, err := f.Lifecycle.GetConnection().OpenChannel("forwarded-tcpip", payload)
if err != nil {
log.Printf("Failed to open forwarded-tcpip channel: %v", err)
@ -129,33 +129,18 @@ func (f *Forwarder) Close() error {
return nil
}
func ParseAddr(addr string) (string, uint32) {
host, portStr, err := net.SplitHostPort(addr)
if err != nil {
log.Printf("Failed to parse origin address: %s from address %s", err.Error(), addr)
return "0.0.0.0", uint32(0)
}
port, _ := strconv.Atoi(portStr)
return host, uint32(port)
}
func writeSSHString(buffer *bytes.Buffer, str string) {
err := binary.Write(buffer, binary.BigEndian, uint32(len(str)))
if err != nil {
log.Printf("Failed to write string to buffer: %v", err)
return
}
buffer.WriteString(str)
}
func createForwardedTCPIPPayload(host string, originPort, port uint16) []byte {
func (f *Forwarder) CreateForwardedTCPIPPayload(origin net.Addr) []byte {
var buf bytes.Buffer
host, originPort := parseAddr(origin.String())
writeSSHString(&buf, "localhost")
err := binary.Write(&buf, binary.BigEndian, uint32(port))
err := binary.Write(&buf, binary.BigEndian, uint32(f.GetForwardedPort()))
if err != nil {
log.Printf("Failed to write string to buffer: %v", err)
return nil
}
writeSSHString(&buf, host)
err = binary.Write(&buf, binary.BigEndian, uint32(originPort))
if err != nil {
@ -165,3 +150,22 @@ func createForwardedTCPIPPayload(host string, originPort, port uint16) []byte {
return buf.Bytes()
}
func parseAddr(addr string) (string, uint16) {
host, portStr, err := net.SplitHostPort(addr)
if err != nil {
log.Printf("Failed to parse origin address: %s from address %s", err.Error(), addr)
return "0.0.0.0", uint16(0)
}
port, _ := strconv.Atoi(portStr)
return host, uint16(port)
}
func writeSSHString(buffer *bytes.Buffer, str string) {
err := binary.Write(buffer, binary.BigEndian, uint32(len(str)))
if err != nil {
log.Printf("Failed to write string to buffer: %v", err)
return
}
buffer.WriteString(str)
}