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// Package proxy enables SOCKS5 proxy dialling
package proxy
import (
"fmt"
"net"
"strings"
"golang.org/x/net/proxy"
)
// SOCKS5Dial dials a net.Conn using a SOCKS5 proxy server.
// The socks5Proxy address can be in the form of [user:password@]host:port, [user@]host:port or just host:port if no auth is required.
// It will optionally take a proxyDialer to dial the SOCKS5 proxy server. If nil is passed, it will use the default net.Dialer.
func SOCKS5Dial(network, addr, socks5Proxy string, proxyDialer proxy.Dialer) (net.Conn, error) {
if proxyDialer == nil {
proxyDialer = &net.Dialer{}
}
var (
proxyAddress string
proxyAuth *proxy.Auth
)
if credsAndHost := strings.SplitN(socks5Proxy, "@", 2); len(credsAndHost) == 2 {
proxyCreds := strings.SplitN(credsAndHost[0], ":", 2)
proxyAuth = &proxy.Auth{
User: proxyCreds[0],
}
if len(proxyCreds) == 2 {
proxyAuth.Password = proxyCreds[1]
}
proxyAddress = credsAndHost[1]
} else {
proxyAddress = credsAndHost[0]
}
proxyDialer, err := proxy.SOCKS5("tcp", proxyAddress, proxyAuth, proxyDialer)
if err != nil {
return nil, fmt.Errorf("failed to create proxy dialer: %w", err)
}
return proxyDialer.Dial(network, addr)
}
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