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102 lines
2.2 KiB
Go
102 lines
2.2 KiB
Go
package stream
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import (
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"crypto/tls"
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"crypto/x509"
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"net"
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"time"
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"github.com/pion/dtls/v3"
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"github.com/yusing/godoxy/agent/pkg/agent/common"
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)
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type UDPClient struct {
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conn net.Conn
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}
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// NewUDPClient creates a new UDP client for the agent.
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//
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// It will establish a DTLS connection and send a stream request header to the server.
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//
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// It returns an error if
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// - the target address is invalid
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// - the stream request header is invalid
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// - the DTLS configuration is invalid
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// - the DTLS connection fails
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// - the stream request header is not sent
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func NewUDPClient(serverAddr, targetAddress string, caCert *x509.Certificate, clientCert *tls.Certificate) (net.Conn, error) {
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host, port, err := net.SplitHostPort(targetAddress)
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if err != nil {
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return nil, err
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}
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header, err := NewStreamRequestHeader(host, port)
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if err != nil {
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return nil, err
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}
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// Setup DTLS configuration
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caCertPool := x509.NewCertPool()
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caCertPool.AddCert(caCert)
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dtlsConfig := &dtls.Config{
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Certificates: []tls.Certificate{*clientCert},
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RootCAs: caCertPool,
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InsecureSkipVerify: false,
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ExtendedMasterSecret: dtls.RequireExtendedMasterSecret,
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ServerName: common.CertsDNSName,
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}
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raddr, err := net.ResolveUDPAddr("udp", serverAddr)
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if err != nil {
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return nil, err
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}
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// Establish DTLS connection
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conn, err := dtls.Dial("udp", raddr, dtlsConfig)
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if err != nil {
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return nil, err
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}
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// Send the stream header once as a handshake.
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if _, err := conn.Write(header.Bytes()); err != nil {
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_ = conn.Close()
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return nil, err
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}
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return &UDPClient{
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conn: conn,
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}, nil
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}
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func (c *UDPClient) Read(p []byte) (n int, err error) {
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return c.conn.Read(p)
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}
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func (c *UDPClient) Write(p []byte) (n int, err error) {
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return c.conn.Write(p)
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}
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func (c *UDPClient) LocalAddr() net.Addr {
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return c.conn.LocalAddr()
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}
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func (c *UDPClient) RemoteAddr() net.Addr {
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return c.conn.RemoteAddr()
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}
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func (c *UDPClient) SetDeadline(t time.Time) error {
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return c.conn.SetDeadline(t)
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}
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func (c *UDPClient) SetReadDeadline(t time.Time) error {
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return c.conn.SetReadDeadline(t)
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}
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func (c *UDPClient) SetWriteDeadline(t time.Time) error {
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return c.conn.SetWriteDeadline(t)
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}
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func (c *UDPClient) Close() error {
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return c.conn.Close()
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}
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