commit 2a4bf67aaceebd3567dcd0ac1db2b9027560f574
from: Alexander Barton <alex@barton.de>
date: Tue Aug 17 19:05:06 2010 UTC

Implement user mode "x": hostname cloaking (closes: #102)

When a client has user mode "x" set, its real hostname is cloaked
by substituting it with the server name (as configured in ngircd.conf).

Restricted clients (user mode "r") aren't allowed to change mode "x".

Please note that hostname cloaking is only in effect in server-client
communication! The server still uses the real hostname for its own
logging and for all server-server communication -- therefore all servers
in the network must support user mode "x" to prevent older servers
from leaking the real hostname of a cloaked client!

commit - 575485eb82698a926d38634be2b3e4dce4a5dfd6
commit + 2a4bf67aaceebd3567dcd0ac1db2b9027560f574
blob - 579d5521d02772afcf76e65a8ca132c521d98b0f
blob + 01b60373bbc044153e8c742eab470a7a188318ae
--- src/ngircd/defines.h
+++ src/ngircd/defines.h
@@ -80,7 +80,7 @@
 #define RECONNECT_DELAY 3		/* Time to delay re-connect attempts
 					   in seconds. */
 
-#define USERMODES "aciorsw"		/* Supported user modes. */
+#define USERMODES "aciorswx"		/* Supported user modes. */
 #define CHANMODES "biIklmnoPstvz"	/* Supported channel modes. */
 
 #define CONNECTED true			/* Internal status codes. */
blob - 45defeb2b833f4933c24277b6fad077064b37536
blob + df464a7dba7efca0058cdede4d18ec8090a7eeea
--- src/ngircd/irc-mode.c
+++ src/ngircd/irc-mode.c
@@ -185,6 +185,7 @@ Client_Mode( CLIENT *Client, REQUEST *Req, CLIENT *Ori
 							ERR_NOPRIVILEGES_MSG,
 							Client_ID(Origin));
 				break;
+
 			case 'o': /* IRC operator (only unsettable!) */
 				if(( ! set ) || ( Client_Type( Client ) == CLIENT_SERVER ))
 				{
@@ -197,6 +198,15 @@ Client_Mode( CLIENT *Client, REQUEST *Req, CLIENT *Ori
 			case 'r': /* Restricted (only settable) */
 				if(( set ) || ( Client_Type( Client ) == CLIENT_SERVER )) x[0] = 'r';
 				else ok = IRC_WriteStrClient( Origin, ERR_RESTRICTED_MSG, Client_ID( Origin ));
+				break;
+
+			case 'x': /* Cloak hostname */
+				if (Client_HasMode(Client, 'r'))
+					IRC_WriteStrClient(Origin,
+							   ERR_RESTRICTED_MSG,
+							   Client_ID(Origin));
+				else
+					x[0] = 'x';
 				break;
 
 			default: