Channel_CheckAdminRights(): test if client can admin a channel

This generic function tests if a client is allowed to do administrative
tasks to a specific channel:

 - servers and services are always truested ("allowed everything"),
 - channel operators are allowed,
 - IRC operarors are allowed if OperCanUseMode is set in the config.

src/ngircd/channel.c

@@ -1,6 +1,6 @@
 /*
  * ngIRCd -- The Next Generation IRC Daemon
- * Copyright (c)2001-2009 Alexander Barton (alex@barton.de)
+ * Copyright (c)2001-2011 Alexander Barton (alex@barton.de) and Contributors.
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
@@ -1119,6 +1119,64 @@ Channel_CheckKey(CHANNEL *Chan, CLIENT *Client, const char *Key)
 } /* Channel_CheckKey */
 
 
+/**
+ * Check wether a client is allowed to administer a channel or not.
+ *
+ * @param Chan		The channel to test.
+ * @param Client	The client from which the command has been received.
+ * @param Origin	The originator of the command (or NULL).
+ * @param OnChannel	Set to true if the originator is member of the channel.
+ * @param AdminOk	Set to true if the client is allowed to do
+ *			administrative tasks on this channel.
+ * @param UseServerMode	Set to true if ngIRCd should emulate "server mode",
+ *			that is send commands as if originating from a server
+ *			and not the originator of the command.
+ */
+GLOBAL void
+Channel_CheckAdminRights(CHANNEL *Chan, CLIENT *Client, CLIENT *Origin,
+			 bool *OnChannel, bool *AdminOk, bool *UseServerMode)
+{
+	assert (Chan != NULL);
+	assert (Client != NULL);
+	assert (OnChannel != NULL);
+	assert (AdminOk != NULL);
+	assert (UseServerMode != NULL);
+
+	/* Use the client as origin, if no origin has been given (no prefix?) */
+	if (!Origin)
+		Origin = Client;
+
+	*OnChannel = false;
+	*AdminOk = false;
+	*UseServerMode = false;
+
+	if (Client_Type(Client) != CLIENT_USER
+	    && Client_Type(Client) != CLIENT_SERVER
+	    && Client_Type(Client) != CLIENT_SERVICE)
+		return;
+
+	/* Allow channel administration if the client is a server or service */
+	if (Client_Type(Client) != CLIENT_USER) {
+		*AdminOk = true;
+		return;
+	}
+
+	*OnChannel = Channel_IsMemberOf(Chan, Origin);
+
+	if (*OnChannel && strchr(Channel_UserModes(Chan, Origin), 'o')) {
+		/* User is a channel operator */
+		*AdminOk = true;
+	} else if (Conf_OperCanMode) {
+		/* IRC operators are allowed to administer channels as well */
+		if (Client_OperByMe(Origin)) {
+			*AdminOk = true;
+			if (Conf_OperServerMode)
+				*UseServerMode = true;
+		}
+	}
+} /* Channel_CheckAdminRights */
+
+
 static CL2CHAN *
 Get_First_Cl2Chan( CLIENT *Client, CHANNEL *Chan )
 {

src/ngircd/channel.h

@@ -1,6 +1,6 @@
 /*
  * ngIRCd -- The Next Generation IRC Daemon
- * Copyright (c)2001-2008 by Alexander Barton (alex@barton.de)
+ * Copyright (c)2001-2011 Alexander Barton (alex@barton.de) and Contributors.
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
@@ -133,6 +133,10 @@ GLOBAL void Channel_LogServer PARAMS((const char *msg));
 GLOBAL bool Channel_CheckKey PARAMS((CHANNEL *Chan, CLIENT *Client,
 				     const char *Key));
 
+GLOBAL void Channel_CheckAdminRights PARAMS((CHANNEL *Chan, CLIENT *Client,
+					     CLIENT *Origin, bool *OnChannel,
+					     bool *AdminOk, bool *UseServerMode));
+
 #define Channel_IsLocal(c) (Channel_Name(c)[0] == '&')
 #define Channel_IsModeless(c) (Channel_Name(c)[0] == '+')
 

src/ngircd/irc-mode.c

@@ -1,6 +1,6 @@
 /*
  * ngIRCd -- The Next Generation IRC Daemon
- * Copyright (c)2001-2010 Alexander Barton (alex@barton.de)
+ * Copyright (c)2001-2011 Alexander Barton (alex@barton.de) and Contributors.
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
@@ -316,8 +316,7 @@ Channel_Mode(CLIENT *Client, REQUEST *Req, CLIENT *Origin, CHANNEL *Channel)
 {
 	char the_modes[COMMAND_LEN], the_args[COMMAND_LEN], x[2],
 	    argadd[CLIENT_PASS_LEN], *mode_ptr;
-	bool connected, set, skiponce, retval, onchannel;
+	bool connected, set, skiponce, retval, onchannel, modeok, use_servermode;
-	bool modeok = true, use_servermode = false;
 	int mode_arg, arg_arg;
 	CLIENT *client;
 	long l;
@@ -331,28 +330,13 @@ Channel_Mode(CLIENT *Client, REQUEST *Req, CLIENT *Origin, CHANNEL *Channel)
 	if (Req->argc <= 1)
 		return Channel_Mode_Answer_Request(Origin, Channel);
 
-	/* Is the user allowed to change modes? */
+	Channel_CheckAdminRights(Channel, Client, Origin,
-	if (Client_Type(Client) == CLIENT_USER) {
+				 &onchannel, &modeok, &use_servermode);
-		/* Is the originating user on that channel? */
-		onchannel = Channel_IsMemberOf(Channel, Origin);
-		modeok = false;
-		/* channel operator? */
-		if (onchannel &&
-		    strchr(Channel_UserModes(Channel, Origin), 'o')) {
-			modeok = true;
-		} else if (Conf_OperCanMode) {
-			/* IRC-Operators can use MODE as well */
-			if (Client_OperByMe(Origin)) {
-				modeok = true;
-				if (Conf_OperServerMode)
-					use_servermode = true; /* Change Origin to Server */
-			}
-		}
 
-		if (!onchannel && !modeok)
+	if (!onchannel && !modeok)
-			return IRC_WriteStrClient(Origin, ERR_NOTONCHANNEL_MSG,
+		return IRC_WriteStrClient(Origin, ERR_NOTONCHANNEL_MSG,
-				Client_ID(Origin), Channel_Name(Channel));
+					  Client_ID(Origin),
-	}
+					  Channel_Name(Channel));
 
 	mode_arg = 1;
 	mode_ptr = Req->argv[mode_arg];