69 lines
1.9 KiB
Go
69 lines
1.9 KiB
Go
package prox5
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import (
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"context"
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"errors"
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"net"
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"strconv"
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"sync/atomic"
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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.
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func (s *ProxyEngine) 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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// DialContext is a simple stub adapter to implement a net.Dialer.
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func (s *ProxyEngine) 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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// MysteryDialer is a dialer function that will use a different proxy for every request.
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func (pe *ProxyEngine) MysteryDialer(ctx context.Context, network, addr string) (net.Conn, error) {
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var (
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socksString string
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count int
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)
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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 := pe.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, err
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}
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var sock *Proxy
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for {
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sock = pe.GetAnySOCKS(false)
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if !atomic.CompareAndSwapUint32(&sock.lock, stateUnlocked, stateLocked) {
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continue
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}
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break
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}
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pe.dbgPrint("dialer trying: " + sock.Endpoint + "...")
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tout := ""
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if pe.GetServerTimeoutStr() != "-1" {
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tout = "?timeout=" + pe.GetServerTimeoutStr() + "s"
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}
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socksString = "socks" + getProtoStr(sock.proto) + "://" + sock.Endpoint + tout
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var ok bool
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if sock, ok = pe.dispenseMiddleware(sock); !ok {
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pe.dbgPrint("failed middleware check, " + socksString + ", cycling...")
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continue
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}
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atomic.StoreUint32(&sock.lock, stateUnlocked)
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dialSocks := socks.Dial(socksString)
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conn, err := dialSocks(network, addr)
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if err != nil {
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count++
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pe.dbgPrint("unable to reach [redacted] with " + socksString + ", cycling...")
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continue
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}
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pe.dbgPrint("MysteryDialer using socks: " + socksString)
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return conn, nil
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}
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}
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