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conn.go
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conn.go
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package adc
import (
"bytes"
"context"
"crypto/tls"
"fmt"
"log"
"net"
"net/url"
"time"
"github.com/direct-connect/go-dc/adc"
"github.com/direct-connect/go-dc/keyprint"
"github.com/direct-connect/go-dc/keyprint/tlskp"
)
var (
Debug bool
)
const writeBuffer = 0
var dialer = net.Dialer{}
// Dial connects to a specified address.
func Dial(addr string) (*Conn, error) {
return DialContext(context.Background(), addr)
}
// DialContext connects to a specified address.
func DialContext(ctx context.Context, addr string) (*Conn, error) {
u, err := url.Parse(addr)
if err != nil {
return nil, err
}
if u.Host == "" {
u, err = url.Parse("adc://" + addr)
if err != nil {
return nil, err
}
}
secure := false
switch u.Scheme {
case adc.SchemaADC:
// continue
case adc.SchemaADCS:
secure = true
default:
return nil, fmt.Errorf("unsupported protocol: %q", u.Scheme)
}
conn, err := dialer.DialContext(ctx, "tcp", u.Host)
if err != nil {
return nil, err
}
var kps []string
if secure {
sconn := tls.Client(conn, &tls.Config{
InsecureSkipVerify: true,
})
if err = sconn.Handshake(); err != nil {
_ = sconn.Close()
return nil, fmt.Errorf("TLS handshake failed: %v", err)
}
conn = sconn
// verify keyprint if it's set in the URL
if exp := keyprint.FromURL(u); exp != "" {
if kps, err = tlskp.VerifyKeyPrint(sconn, exp); err != nil {
_ = sconn.Close()
return nil, err
}
} else {
kps = tlskp.GetKeyPrints(sconn)
}
}
c, err := NewConn(conn)
if err != nil {
_ = conn.Close()
return nil, err
}
c.kps = kps
return c, nil
}
// NewConn runs an ADC protocol over a specified connection.
func NewConn(conn net.Conn) (*Conn, error) {
c := &Conn{
conn: conn,
}
c.w = adc.NewWriterSize(conn, writeBuffer)
c.r = adc.NewReader(conn)
if Debug {
c.w.OnLine(func(line []byte) (bool, error) {
line = bytes.TrimSuffix(line, []byte{'\n'})
log.Println("->", string(line))
return true, nil
})
c.r.OnLine(func(line []byte) (bool, error) {
line = bytes.TrimSuffix(line, []byte{'\n'})
log.Println("<-", string(line))
return true, nil
})
}
return c, nil
}
// Conn is an ADC protocol connection.
type Conn struct {
kps []string // keyprints, set by TLS
closed chan struct{}
conn net.Conn
w *adc.Writer
r *adc.Reader
}
// GetKeyPrints returns keyprints set by TLS, if any.
func (c *Conn) GetKeyPrints() []string {
return c.kps
}
func (c *Conn) OnLineR(fnc func(line []byte) (bool, error)) {
c.r.OnLine(fnc)
}
func (c *Conn) OnLineW(fnc func(line []byte) (bool, error)) {
c.w.OnLine(fnc)
}
func (c *Conn) LocalAddr() net.Addr {
return c.conn.LocalAddr()
}
func (c *Conn) RemoteAddr() net.Addr {
return c.conn.RemoteAddr()
}
func (c *Conn) SetWriteDeadline(t time.Time) error {
return c.conn.SetWriteDeadline(t)
}
func (c *Conn) SetWriteTimeout(dt time.Duration) {
if dt <= 0 {
c.w.Timeout = nil
return
}
c.w.Timeout = func(enable bool) error {
if enable {
return c.conn.SetWriteDeadline(time.Now().Add(dt))
}
return c.conn.SetWriteDeadline(time.Time{})
}
}
func (c *Conn) ZOn(lvl int) error {
return c.w.EnableZlibLevel(lvl)
}
// Close closes the connection.
func (c *Conn) Close() error {
if c.closed != nil {
select {
case <-c.closed:
default:
close(c.closed)
}
}
return c.conn.Close()
}
func (c *Conn) WriteKeepAlive() error {
return c.w.WriteKeepAlive()
}
// ReadPacket reads and decodes a single ADC command.
func (c *Conn) ReadPacket(deadline time.Time) (adc.Packet, error) {
if !deadline.IsZero() {
c.conn.SetReadDeadline(deadline)
defer c.conn.SetReadDeadline(time.Time{})
}
return c.r.ReadPacket()
}
// ReadPacketRaw reads and decodes a single ADC command. Caller must copy the payload.
func (c *Conn) ReadPacketRaw(deadline time.Time) (adc.Packet, error) {
if !deadline.IsZero() {
c.conn.SetReadDeadline(deadline)
defer c.conn.SetReadDeadline(time.Time{})
}
return c.r.ReadPacketRaw()
}
func (c *Conn) ReadInfoMsg(deadline time.Time) (adc.Message, error) {
if !deadline.IsZero() {
c.conn.SetReadDeadline(deadline)
defer c.conn.SetReadDeadline(time.Time{})
}
return c.r.ReadInfo()
}
func (c *Conn) ReadClientMsg(deadline time.Time) (adc.Message, error) {
if !deadline.IsZero() {
c.conn.SetReadDeadline(deadline)
defer c.conn.SetReadDeadline(time.Time{})
}
return c.r.ReadClient()
}
func (c *Conn) Broadcast(from SID) adc.WriteStream {
return c.w.BroadcastStream(from)
}
func (c *Conn) WriteInfoMsg(msg adc.Message) error {
return c.w.WriteInfo(msg)
}
func (c *Conn) WriteHubMsg(msg adc.Message) error {
return c.w.WriteHub(msg)
}
func (c *Conn) WriteClientMsg(msg adc.Message) error {
return c.w.WriteClient(msg)
}
func (c *Conn) WriteBroadcast(id SID, msg adc.Message) error {
return c.w.WriteBroadcast(id, msg)
}
func (c *Conn) WriteDirect(id, targ SID, msg adc.Message) error {
return c.w.WriteDirect(id, targ, msg)
}
func (c *Conn) WriteEcho(id, targ SID, msg adc.Message) error {
return c.w.WriteEcho(id, targ, msg)
}
func (c *Conn) WritePacket(p adc.Packet) error {
return c.w.WritePacket(p)
}
// Flush the underlying buffer. Should be called after each WritePacket batch.
func (c *Conn) Flush() error {
return c.w.Flush()
}