109 lines
2.2 KiB
Go
109 lines
2.2 KiB
Go
package mullsox
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import (
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"context"
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"fmt"
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"net"
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"net/netip"
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"sync"
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"time"
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)
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func persistentResolver(hostname string) []netip.Addr {
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ctx, cancel := context.WithTimeout(context.Background(), 10*time.Second)
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defer cancel()
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var ips []netip.Addr
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if hostname == "" {
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return ips
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}
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for n := 0; n < 5; n++ {
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var err error
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var res []netip.Addr
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go func() {
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res, err = net.DefaultResolver.LookupNetIP(ctx, "ip", hostname)
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if err == nil && res != nil && len(res) > 0 {
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ips = res
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cancel()
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}
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}()
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time.Sleep(1 * time.Second)
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}
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<-ctx.Done()
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return ips
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}
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func (c *Checker) GetSOCKS() (sox []netip.AddrPort, err error) {
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if err = c.Update(); err != nil {
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return
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}
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var tmpMap = make(map[netip.AddrPort]struct{})
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var tmpMapMu = &sync.RWMutex{}
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wg := &sync.WaitGroup{}
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for _, serv := range c.m {
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wg.Add(1)
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go func(endpoint *MullvadServer) {
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defer wg.Done()
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ips := persistentResolver(endpoint.SocksName)
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for _, ip := range ips {
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port := uint16(endpoint.SocksPort)
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if port == 0 {
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port = 1080
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}
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ap := netip.AddrPortFrom(ip, port)
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tmpMapMu.RLock()
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_, ok := tmpMap[ap]
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if ap.IsValid() && ap.Port() > 0 && !ok {
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sox = append(sox, ap)
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tmpMapMu.RUnlock()
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tmpMapMu.Lock()
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tmpMap[ap] = struct{}{}
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tmpMapMu.Unlock()
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continue
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}
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tmpMapMu.RUnlock()
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if !ap.IsValid() {
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err = fmt.Errorf("invalid address/port combo: %s", ap.String())
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}
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}
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}(&serv)
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}
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wg.Wait()
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return
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}
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func (c *Checker) GetAndVerifySOCKS() (chan netip.AddrPort, chan error) {
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sox, err := c.GetSOCKS()
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var errs = make(chan error, len(sox)+1)
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var verified = make(chan netip.AddrPort, len(sox))
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if err != nil || len(sox) == 0 {
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errs <- err
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close(errs)
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return nil, errs
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}
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wg := &sync.WaitGroup{}
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wg.Add(len(sox))
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for _, prx := range sox {
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time.Sleep(250 * time.Millisecond)
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go func(prx netip.AddrPort) {
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defer wg.Done()
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var conn net.Conn
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conn, err = net.DialTimeout("tcp", prx.String(), 10*time.Second)
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if err != nil {
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errs <- err
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}
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if conn != nil {
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_ = conn.Close()
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}
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if err == nil {
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verified <- prx
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}
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}(prx)
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}
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go func() {
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wg.Wait()
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close(errs)
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close(verified)
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}()
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return verified, errs
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}
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