Allow multiple listeners, default to ircs

Users can now specify multiple "listen" directives in their
configuration file. If -listen is specified on the CLI, it's added to
the list of listeners.

Listeners are now parsed as URLs. If the scheme is missing "ircs" is
assumed. URLs allow to enable/disable TLS on a per-listener basis and
will be used for Unix sockets too.

The default listening address is changed from irc+insecure://:6667 to
ircs://:6697. This avoids setting up an insecure listener opened to
everybody.

README.md

@@ -13,7 +13,7 @@ A user-friendly IRC bouncer.
 ## Usage
 
     go run ./cmd/sojuctl create-user <username>
-    go run ./cmd/soju
+    go run ./cmd/soju -listen irc+insecure://127.0.0.1:6667
 
 Then connect with username `<username>/chat.freenode.net` and join `#soju`.
 

cmd/soju/main.go

@@ -5,15 +5,17 @@ import (
 	"flag"
 	"log"
 	"net"
+	"net/url"
+	"strings"
 
 	"git.sr.ht/~emersion/soju"
 	"git.sr.ht/~emersion/soju/config"
 )
 
 func main() {
-	var addr, configPath string
+	var listen, configPath string
 	var debug bool
-	flag.StringVar(&addr, "listen", "", "listening address")
+	flag.StringVar(&listen, "listen", "", "listening address")
 	flag.StringVar(&configPath, "config", "", "path to configuration file")
 	flag.BoolVar(&debug, "debug", false, "enable debug logging")
 	flag.Parse()
@@ -29,8 +31,11 @@ func main() {
 		cfg = config.Defaults()
 	}
 
-	if addr != "" {
-		cfg.Addr = addr
+	if listen != "" {
+		cfg.Listen = append(cfg.Listen, listen)
+	}
+	if len(cfg.Listen) == 0 {
+		cfg.Listen = []string{":6697"}
 	}
 
 	db, err := soju.OpenSQLDB(cfg.SQLDriver, cfg.SQLSource)
@@ -38,24 +43,13 @@ func main() {
 		log.Fatalf("failed to open database: %v", err)
 	}
 
-	var ln net.Listener
+	var tlsCfg *tls.Config
 	if cfg.TLS != nil {
 		cert, err := tls.LoadX509KeyPair(cfg.TLS.CertPath, cfg.TLS.KeyPath)
 		if err != nil {
 			log.Fatalf("failed to load TLS certificate and key: %v", err)
 		}
-
-		tlsCfg := &tls.Config{Certificates: []tls.Certificate{cert}}
-		ln, err = tls.Listen("tcp", cfg.Addr, tlsCfg)
-		if err != nil {
-			log.Fatalf("failed to start TLS listener: %v", err)
-		}
-	} else {
-		var err error
-		ln, err = net.Listen("tcp", cfg.Addr)
-		if err != nil {
-			log.Fatalf("failed to start listener: %v", err)
-		}
+		tlsCfg = &tls.Config{Certificates: []tls.Certificate{cert}}
 	}
 
 	srv := soju.NewServer(db)
@@ -64,11 +58,50 @@ func main() {
 	srv.LogPath = cfg.LogPath
 	srv.Debug = debug
 
-	log.Printf("server listening on %q", cfg.Addr)
+	for _, listen := range cfg.Listen {
+		listenURI := listen
+		if !strings.Contains(listenURI, ":/") {
+			// This is a raw domain name, make it an URL with an empty scheme
+			listenURI = "//" + listenURI
+		}
+		u, err := url.Parse(listenURI)
+		if err != nil {
+			log.Fatalf("failed to parse listen URI %q: %v", listen, err)
+		}
+
+		switch u.Scheme {
+		case "ircs", "":
+			if tlsCfg == nil {
+				log.Fatalf("failed to listen on %q: missing TLS configuration", listen)
+			}
+			host := u.Host
+			if _, _, err := net.SplitHostPort(host); err != nil {
+				host = host + ":6697"
+			}
+			ln, err := tls.Listen("tcp", host, tlsCfg)
+			if err != nil {
+				log.Fatalf("failed to start TLS listener on %q: %v", listen, err)
+			}
 			go func() {
-		if err := srv.Run(); err != nil {
-			log.Fatal(err)
-		}
-	}()
 				log.Fatal(srv.Serve(ln))
+			}()
+		case "irc+insecure":
+			host := u.Host
+			if _, _, err := net.SplitHostPort(host); err != nil {
+				host = host + ":6667"
+			}
+			ln, err := net.Listen("tcp", host)
+			if err != nil {
+				log.Fatalf("failed to start listener on %q: %v", listen, err)
+			}
+			go func() {
+				log.Fatal(srv.Serve(ln))
+			}()
+		default:
+			log.Fatalf("failed to listen on %q: unsupported scheme", listen)
+		}
+
+		log.Printf("server listening on %q", listen)
+	}
+	log.Fatal(srv.Run())
 }

config/config.go

@@ -14,7 +14,7 @@ type TLS struct {
 }
 
 type Server struct {
-	Addr      string
+	Listen    []string
 	Hostname  string
 	TLS       *TLS
 	SQLDriver string
@@ -28,7 +28,6 @@ func Defaults() *Server {
 		hostname = "localhost"
 	}
 	return &Server{
-		Addr:      ":6667",
 		Hostname:  hostname,
 		SQLDriver: "sqlite3",
 		SQLSource: "soju.db",
@@ -68,9 +67,11 @@ func Parse(r io.Reader) (*Server, error) {
 	for _, d := range directives {
 		switch d.Name {
 		case "listen":
-			if err := d.parseParams(&srv.Addr); err != nil {
+			var uri string
+			if err := d.parseParams(&uri); err != nil {
 				return nil, err
 			}
+			srv.Listen = append(srv.Listen, uri)
 		case "hostname":
 			if err := d.parseParams(&srv.Hostname); err != nil {
 				return nil, err

doc/soju.1.scd

@@ -56,15 +56,25 @@ be done by adding a "@<client>" suffix to the username.
 	Enable debug logging (this will leak sensitive information such as
 	passwords).
 
-*-listen* <address>
-	Listening address (default: ":6667").
+*-listen* <uri>
+	Listening URI (default: ":6697").
 
 # CONFIG FILE
 
 The config file has one directive per line.
 
-*listen* <address>
-	Listening address (default: ":6667").
+*listen* <uri>
+	Listening URI (default: ":6697").
+
+	The following URIs are supported:
+
+	- _[ircs://][host][:port]_ listens with TLS over TCP (default port if
+	  omitted: 6697)
+	- _irc+insecure://[host][:port]_ listens with plain-text over TCP (default
+	  port if omitted: 6667)
+
+	If the scheme is omitted, "ircs" is assumed. If multiple *listen*
+	directives are specified, soju will listen on each of them.
 
 *hostname* <name>
 	Server hostname (default: system hostname).
@@ -97,6 +107,7 @@ abbreviated form, for instance *network* can be abbreviated as *net* or just
 	Connect to a new network at _addr_. _-addr_ is mandatory.
 
 	_addr_ supports several connection types:
+
 	- _[ircs://]host[:port]_ connects with TLS over TCP
 	- _irc+insecure://host[:port]_ connects with plain-text TCP