From a57748e1a14dc6fa51291d31dae92c9a5abdd7c0 Mon Sep 17 00:00:00 2001
From: Alexander Barton <alex@barton.de>
Date: Mon, 10 Jan 2011 12:15:05 +0100
Subject: [PATCH] Implement channel mode 'O': "IRC operators only"

This channel mode is used on DALnet (bahamut), for example.
---
 src/ngircd/defines.h     |  2 +-
 src/ngircd/irc-channel.c |  7 +++++++
 src/ngircd/irc-mode.c    | 17 +++++++++++++++++
 src/ngircd/messages.h    |  1 +
 4 files changed, 26 insertions(+), 1 deletion(-)

diff --git a/src/ngircd/defines.h b/src/ngircd/defines.h
index ff456a34..3f1122ca 100644
--- a/src/ngircd/defines.h
+++ b/src/ngircd/defines.h
@@ -81,7 +81,7 @@
 					   in seconds. */
 
 #define USERMODES "aciorswx"		/* Supported user modes. */
-#define CHANMODES "biIklmnoPstvz"	/* Supported channel modes. */
+#define CHANMODES "biIklmnoOPstvz"	/* Supported channel modes. */
 
 #define CONNECTED true			/* Internal status codes. */
 #define DISCONNECTED false
diff --git a/src/ngircd/irc-channel.c b/src/ngircd/irc-channel.c
index 81a9eb2e..ed71dc70 100644
--- a/src/ngircd/irc-channel.c
+++ b/src/ngircd/irc-channel.c
@@ -122,6 +122,13 @@ join_allowed(CLIENT *Client, CHANNEL *chan, const char *channame,
 		return false;
 	}
 
+	if (strchr(channel_modes, 'O') && !Client_OperByMe(Client)) {
+		/* Only IRC operators are allowed! */
+		IRC_WriteStrClient(Client, ERR_OPONLYCHANNEL_MSG,
+				   Client_ID(Client), channame);
+		return false;
+	}
+
 	return true;
 }
 
diff --git a/src/ngircd/irc-mode.c b/src/ngircd/irc-mode.c
index 1e6772a6..30f4dee3 100644
--- a/src/ngircd/irc-mode.c
+++ b/src/ngircd/irc-mode.c
@@ -499,6 +499,23 @@ Channel_Mode(CLIENT *Client, REQUEST *Req, CLIENT *Origin, CHANNEL *Channel)
 				goto chan_exit;
 			}
 			break;
+		case 'O': /* IRC operators only */
+			if (modeok) {
+				/* Only IRC operators are allowed to
+				 * set the 'O' channel mode! */
+				if (set && !(Client_OperByMe(Client)
+				    || Client_Type(Client) == CLIENT_SERVER))
+					connected = IRC_WriteStrClient(Origin,
+						ERR_NOPRIVILEGES_MSG,
+						Client_ID(Origin));
+				else
+					x[0] = 'O';
+			} else
+				connected = IRC_WriteStrClient(Origin,
+						ERR_CHANOPRIVSNEEDED_MSG,
+						Client_ID(Origin),
+						Channel_Name(Channel));
+				break;
 		case 'P': /* Persistent channel */
 			if (modeok) {
 				/* Only IRC operators are allowed to
diff --git a/src/ngircd/messages.h b/src/ngircd/messages.h
index 900d2ff1..ec4bd869 100644
--- a/src/ngircd/messages.h
+++ b/src/ngircd/messages.h
@@ -117,6 +117,7 @@
 #define ERR_PASSWDMISMATCH_MSG		"464 %s :Invalid password"
 #define ERR_CHANNELISFULL_MSG		"471 %s %s :Cannot join channel (+l)"
 #define ERR_SECURECHANNEL_MSG		"471 %s %s :Cannot join channel (+z)"
+#define ERR_OPONLYCHANNEL_MSG		"471 %s %s :Cannot join channel (+O)"
 #define ERR_UNKNOWNMODE_MSG		"472 %s: %c :is unknown mode char for %s"
 #define ERR_INVITEONLYCHAN_MSG		"473 %s %s :Cannot join channel (+i)"
 #define ERR_BANNEDFROMCHAN_MSG		"474 %s %s :Cannot join channel (+b)"
-- 
2.39.2