ginuerzh
4efb4b9974
Add nil checks for connect-options dialer and logger to prevent nil-pointer panics when Connect is called without a DialerConnectOption or LoggerOption. Add package and NewConnector godoc comments. Add 10 unit tests covering construction, Init metadata parsing, Connect success/reject/dial-error paths, nil dialer, nil logger, and the reject conn stub.
84 lines
2.0 KiB
Go
84 lines
2.0 KiB
Go
// Package direct implements a direct (transparent) connector that establishes
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// connections to destination addresses using the dialer provided via connect
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// options. It also supports a "reject" action that returns a dead connection
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// (reads return io.EOF, writes return io.ErrClosedPipe) without dialing.
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package direct
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import (
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"context"
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"errors"
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"net"
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"github.com/go-gost/core/connector"
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md "github.com/go-gost/core/metadata"
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ctxvalue "github.com/go-gost/x/ctx"
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"github.com/go-gost/x/registry"
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)
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func init() {
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registry.ConnectorRegistry().Register("direct", NewConnector)
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registry.ConnectorRegistry().Register("virtual", NewConnector)
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}
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type directConnector struct {
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md metadata
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options connector.Options
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}
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// NewConnector creates a direct connector with the given options.
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func NewConnector(opts ...connector.Option) connector.Connector {
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options := connector.Options{}
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for _, opt := range opts {
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opt(&options)
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}
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return &directConnector{
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options: options,
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}
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}
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func (c *directConnector) Init(md md.Metadata) (err error) {
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return c.parseMetadata(md)
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}
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func (c *directConnector) Connect(ctx context.Context, _ net.Conn, network, address string, opts ...connector.ConnectOption) (net.Conn, error) {
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var cOpts connector.ConnectOptions
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for _, opt := range opts {
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opt(&cOpts)
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}
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if c.md.action == "reject" {
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return &conn{}, nil
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}
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if cOpts.Dialer == nil {
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return nil, errors.New("direct: missing dialer in connect options")
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}
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conn, err := cOpts.Dialer.Dial(ctx, network, address)
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if err != nil {
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return nil, err
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}
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if c.options.Logger != nil {
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var localAddr, remoteAddr string
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if addr := conn.LocalAddr(); addr != nil {
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localAddr = addr.String()
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}
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if addr := conn.RemoteAddr(); addr != nil {
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remoteAddr = addr.String()
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}
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log := c.options.Logger.WithFields(map[string]any{
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"remote": remoteAddr,
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"local": localAddr,
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"network": network,
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"address": address,
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"sid": string(ctxvalue.SidFromContext(ctx)),
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})
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log.Debugf("connect %s/%s", address, network)
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}
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return conn, nil
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}
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