New configuration option "Listen" to bind the server to a specific ip.

ChangeLog

@@ -12,6 +12,8 @@
 
 ngIRCd CVS-HEAD
 
+  - Added new configuration variable "Listen" to bind all listening
+    sockets of the server to a single IP address.
   - Suppress misleading error message of diff during make run.
   - Enhanced test-suite and made it work on GNU/Hurd.
   - Fixed minor typo in debug output :-)
@@ -464,4 +466,4 @@ ngIRCd 0.0.1, 31.12.2001
 
 
 -- 
-$Id: ChangeLog,v 1.210 2003/09/09 13:24:41 alex Exp $
+$Id: ChangeLog,v 1.211 2003/09/11 12:05:28 alex Exp $

NEWS

@@ -10,6 +10,11 @@
                                   -- NEWS --
 
 
+ngIRCd CVS-HEAD
+
+  - Added new configuration variable "Listen" to bind all listening
+    sockets of the server to a single IP address.
+       
 ngIRCd 0.7.1 (2003-07-18)
 
   - Added support for GNU/Hurd.
@@ -165,4 +170,4 @@ ngIRCd 0.0.1, 31.12.2001
 
 
 -- 
-$Id: NEWS,v 1.57 2003/08/30 20:37:15 alex Exp $
+$Id: NEWS,v 1.58 2003/09/11 12:05:28 alex Exp $

doc/sample-ngircd.conf

@@ -1,4 +1,4 @@
-# $Id: sample-ngircd.conf,v 1.22 2003/04/29 12:36:09 alex Exp $
+# $Id: sample-ngircd.conf,v 1.23 2003/09/11 12:05:28 alex Exp $
 
 #
 # This is a sample configuration file for the ngIRCd, which must adept to
@@ -36,6 +36,10 @@
 	# Ports on which the server should listen. There may be more than
 	# one port, separated with ";". (Default: 6667)
 	;Ports = 6667, 6668, 66694
+
+	# IP address on which the server should listen. (Default: empty,
+	# so the server listens on all IP addresses of the system)
+	;Listen = 1.2.3.4
 	
 	# Text file with the "message of the day" (MOTD). This message will
 	# be shown to all users connecting to the server:

man/ngircd.conf.5

@@ -1,5 +1,5 @@
 .\"
-.\" $Id: ngircd.conf.5,v 1.10 2003/05/02 20:51:42 alex Exp $
+.\" $Id: ngircd.conf.5,v 1.11 2003/09/11 12:05:28 alex Exp $
 .\"
 .TH ngircd.conf 5 "Mai 2003" ngircd "ngIRCd Manual"
 .SH NAME
@@ -67,6 +67,10 @@ command.
 Ports on which the server should listen. There may be more than one port,
 separated with ';'. Default: 6667.
 .TP
+\fBListen\fR
+The ip address on which the server should listen. Default is empty, so
+the server listens on all configured ip addresses and interfaces.
+.TP
 \fBMotdFile\fR
 Text file with the "message of the day" (MOTD). This message will be shown
 to all users connecting to the server.

src/ngircd/conf.c

@@ -14,7 +14,7 @@
 
 #include "portab.h"
 
-static char UNUSED id[] = "$Id: conf.c,v 1.59 2003/04/29 12:36:09 alex Exp $";
+static char UNUSED id[] = "$Id: conf.c,v 1.60 2003/09/11 12:05:28 alex Exp $";
 
 #include "imp.h"
 #include <assert.h>
@@ -120,6 +120,7 @@ Conf_Test( VOID )
 		printf( "%u", Conf_ListenPorts[i] );
 	}
 	puts( "" );
+	printf( "  Listen = %s\n", Conf_ListenAddress );
 	pwd = getpwuid( Conf_UID );
 	if( pwd ) printf( "  ServerUID = %s\n", pwd->pw_name );
 	else printf( "  ServerUID = %ld\n", (LONG)Conf_UID );
@@ -340,6 +341,7 @@ Set_Defaults( BOOLEAN InitServers )
 	strlcat( Conf_MotdFile, MOTD_FILE, sizeof( Conf_MotdFile ));
 
 	Conf_ListenPorts_Count = 0;
+	strcpy( Conf_ListenAddress, "" );
 
 	Conf_UID = Conf_GID = 0;
 	
@@ -699,6 +701,15 @@ Handle_GLOBAL( INT Line, CHAR *Var, CHAR *Arg )
 		Conf_MaxJoins = atoi( Arg );
 		return;
 	}
+	if( strcasecmp( Var, "Listen" ) == 0 )
+	{
+		/* IP-Address to bind sockets */
+		if( strlcpy( Conf_ListenAddress, Arg, sizeof( Conf_ListenAddress )) >= sizeof( Conf_ListenAddress ))
+		{
+			Config_Error( LOG_WARNING, "%s, line %d: Value of \"Listen\" too long!", NGIRCd_ConfFile, Line );
+			return;
+		}
+	}
 
 	Config_Error( LOG_ERR, "%s, line %d (section \"Global\"): Unknown variable \"%s\"!", NGIRCd_ConfFile, Line, Var );
 } /* Handle_GLOBAL */

src/ngircd/conf.h

@@ -8,7 +8,7 @@
  * (at your option) any later version.
  * Please read the file COPYING, README and AUTHORS for more information.
  *
- * $Id: conf.h,v 1.26 2002/12/31 16:12:50 alex Exp $
+ * $Id: conf.h,v 1.27 2003/09/11 12:05:28 alex Exp $
  *
  * Configuration management (header)
  */
@@ -76,6 +76,9 @@ GLOBAL CHAR Conf_MotdFile[FNAME_LEN];
 GLOBAL UINT Conf_ListenPorts[MAX_LISTEN_PORTS];
 GLOBAL INT Conf_ListenPorts_Count;
 
+/* Address to which the socket should be bound or empty (=all) */
+GLOBAL CHAR Conf_ListenAddress[16];
+
 /* User and group ID the server should run with */
 GLOBAL UINT Conf_UID;
 GLOBAL UINT Conf_GID;

src/ngircd/conn.c

@@ -16,7 +16,7 @@
 
 #include "portab.h"
 
-static char UNUSED id[] = "$Id: conn.c,v 1.124 2003/08/30 20:28:54 alex Exp $";
+static char UNUSED id[] = "$Id: conn.c,v 1.125 2003/09/11 12:05:28 alex Exp $";
 
 #include "imp.h"
 #include <assert.h>
@@ -236,6 +236,7 @@ Conn_NewListener( CONST UINT Port )
 	/* Create new listening socket on specified port */
 
 	struct sockaddr_in addr;
+	struct in_addr inaddr;
 	INT sock;
 #ifdef RENDEZVOUS
 	CHAR name[CLIENT_ID_LEN], *info;
@@ -243,9 +244,24 @@ Conn_NewListener( CONST UINT Port )
 
 	/* Server-"Listen"-Socket initialisieren */
 	memset( &addr, 0, sizeof( addr ));
+	memset( &inaddr, 0, sizeof( inaddr ));
 	addr.sin_family = AF_INET;
 	addr.sin_port = htons( Port );
-	addr.sin_addr.s_addr = htonl( INADDR_ANY );
+	if( Conf_ListenAddress[0] )
+	{
+#ifdef HAVE_INET_ATON
+		if( inet_aton( Conf_ListenAddress, &inaddr ) == 0 )
+#else
+		inaddr.s_addr = inet_addr( Conf_ListenAddress );
+		if( inaddr.s_addr == (unsigned)-1 )
+#endif
+		{
+			Log( LOG_CRIT, "Can't listen on %s:%u: can't convert ip address %s!", Conf_ListenAddress, Port, Conf_ListenAddress );
+			return FALSE;
+		}
+	}
+	else inaddr.s_addr = htonl( INADDR_ANY );
+	addr.sin_addr = inaddr;
 
 	/* Socket erzeugen */
 	sock = socket( PF_INET, SOCK_STREAM, 0);
@@ -279,7 +295,8 @@ Conn_NewListener( CONST UINT Port )
 
 	if( sock > Conn_MaxFD ) Conn_MaxFD = sock;
 
-	Log( LOG_INFO, "Now listening on port %d (socket %d).", Port, sock );
+	if( Conf_ListenAddress[0]) Log( LOG_INFO, "Now listening on %s:%d (socket %d).", Conf_ListenAddress, Port, sock );
+	else Log( LOG_INFO, "Now listening on 0.0.0.0:%d (socket %d).", Port, sock );
 
 #ifdef RENDEZVOUS
 	/* Get best server description text */