serj
76 lines
2.0 KiB
Go
76 lines
2.0 KiB
Go
package main
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import (
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"log"
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"net"
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"os"
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"github.com/armon/go-socks5"
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"github.com/caarlos0/env/v6"
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)
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type params struct {
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User string `env:"PROXY_USER" envDefault:""`
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Password string `env:"PROXY_PASSWORD" envDefault:""`
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Port string `env:"PROXY_PORT" envDefault:"1080"`
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AllowedDestFqdn string `env:"ALLOWED_DEST_FQDN" envDefault:""`
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AllowedIPs []string `env:"ALLOWED_IPS" envSeparator:"," envDefault:""`
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ListenIP string `env:"PROXY_LISTEN_IP" envDefault:"0.0.0.0"`
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RequireAuth bool `env:"REQUIRE_AUTH" envDefault:"true"`
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}
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func main() {
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// Working with app params
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cfg := params{}
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err := env.Parse(&cfg)
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if err != nil {
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log.Printf("%+v\n", err)
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}
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//Initialize socks5 config
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socks5conf := &socks5.Config{
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Logger: log.New(os.Stdout, "", log.LstdFlags),
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}
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if cfg.RequireAuth {
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if cfg.User == "" || cfg.Password == "" {
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log.Fatalln("Error: REQUIRE_AUTH is true, but PROXY_USER and PROXY_PASSWORD are not set. The application will now exit.")
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}
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creds := socks5.StaticCredentials{
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cfg.User: cfg.Password,
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}
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cator := socks5.UserPassAuthenticator{Credentials: creds}
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socks5conf.AuthMethods = []socks5.Authenticator{cator}
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} else {
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log.Println("Warning: Running the proxy server without authentication. This is NOT recommended for public servers.")
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}
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if cfg.AllowedDestFqdn != "" {
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socks5conf.Rules = PermitDestAddrPattern(cfg.AllowedDestFqdn)
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}
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server, err := socks5.New(socks5conf)
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if err != nil {
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log.Fatal(err)
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}
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// Set IP whitelist
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if len(cfg.AllowedIPs) > 0 {
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whitelist := make([]net.IP, len(cfg.AllowedIPs))
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for i, ip := range cfg.AllowedIPs {
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whitelist[i] = net.ParseIP(ip)
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}
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server.SetIPWhitelist(whitelist)
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}
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listenAddr := ":" + cfg.Port
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if cfg.ListenIP != "" {
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listenAddr = cfg.ListenIP + ":" + cfg.Port
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}
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log.Printf("Start listening proxy service on %s\n", listenAddr)
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if err := server.ListenAndServe("tcp", listenAddr); err != nil {
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log.Fatal(err)
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}
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}
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