71 lines
2.0 KiB
Go
71 lines
2.0 KiB
Go
package prox5
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import (
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"context"
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"errors"
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"fmt"
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"net"
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"strconv"
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"sync/atomic"
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"time"
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"h12.io/socks"
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)
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// DialContext is a simple stub adapter to implement a net.Dialer with context.
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func (s *Swamp) DialContext(ctx context.Context, network, addr string) (net.Conn, error) {
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return s.MysteryDialer(ctx, network, addr)
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}
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// Dial is a simple stub adapter to implement a net.Dialer.
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func (s *Swamp) Dial(network, addr string) (net.Conn, error) {
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return s.DialContext(context.Background(), network, addr)
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}
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// DialTimeout is a simple stub adapter to implement a net.Dialer with a timeout.
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func (s *Swamp) DialTimeout(network, addr string, timeout time.Duration) (net.Conn, error) {
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ctx, _ := context.WithDeadline(context.Background(), time.Now().Add(timeout))
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return s.MysteryDialer(ctx, network, addr)
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}
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// MysteryDialer is a dialer function that will use a different proxy for every request.
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func (s *Swamp) MysteryDialer(ctx context.Context, network, addr string) (net.Conn, error) {
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var sock *Proxy
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var conn net.Conn
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var count int
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// pull down proxies from channel until we get a proxy good enough for our spoiled asses
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for {
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max := s.GetDialerBailout()
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if count > max {
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return nil, errors.New("giving up after " + strconv.Itoa(max) + " tries")
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}
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if err := ctx.Err(); err != nil {
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return nil, fmt.Errorf("context error: %v", err)
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}
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sock = s.GetAnySOCKS()
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for !atomic.CompareAndSwapUint32(&sock.lock, stateUnlocked, stateLocked) {
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if sock == nil {
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break
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}
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randSleep()
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}
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if sock == nil {
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continue
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}
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s.dbgPrint("dialer trying: " + sock.Endpoint + "...")
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atomic.StoreUint32(&sock.lock, stateUnlocked)
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dialSocks := socks.Dial(sock.String())
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var err error
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if conn, err = dialSocks(network, addr); err != nil {
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count++
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s.dbgPrint(ylw + "unable to reach [redacted] with " + sock.String() + ", cycling..." + rst)
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continue
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}
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break
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}
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s.dbgPrint(grn + "MysteryDialer using socks: " + sock.String() + rst)
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return conn, nil
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}
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