Streamline handling of connection rejects (bad password, G/K-line)

- Use Client_Reject(), get rid of Reject_Client().
 - Refactor Class_IsMember() to Class_GetMemberReason(),
 - New function Class_HandleServerBans().

src/ngircd/class.c

@@ -1,6 +1,6 @@
 /*
  * ngIRCd -- The Next Generation IRC Daemon
- * Copyright (c)2001-2011 Alexander Barton (alex@barton.de) and Contributors.
+ * Copyright (c)2001-2012 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
@@ -26,12 +26,15 @@
 #include "client.h"
 #include "lists.h"
 #include "match.h"
+#include "stdio.h"
 
 #include "exp.h"
 #include "class.h"
 
 struct list_head My_Classes[CLASS_COUNT];
 
+char Reject_Reason[COMMAND_LEN];
+
 GLOBAL void
 Class_Init(void)
 {
@@ -46,15 +49,61 @@ Class_Exit(void)
 	for (i = 0; i < CLASS_COUNT; Lists_Free(&My_Classes[i++]));
 }
 
-GLOBAL bool
-Class_IsMember(const int Class, CLIENT *Client)
+GLOBAL char *
+Class_GetMemberReason(const int Class, CLIENT *Client)
 {
+	char *reason;
+
 	assert(Class < CLASS_COUNT);
 	assert(Client != NULL);
 
-	return Lists_Check(&My_Classes[Class], Client);
+	reason = Lists_CheckReason(&My_Classes[Class], Client);
+	if (!reason)
+		return NULL;
+
+	if (!*reason)
+		reason = "listed";
+
+	switch(Class) {
+		case CLASS_GLINE:
+			snprintf(Reject_Reason, sizeof(Reject_Reason),
+				 "\"%s\" (G-Line)", reason);
+			return Reject_Reason;
+		case CLASS_KLINE:
+			snprintf(Reject_Reason, sizeof(Reject_Reason),
+				 "\"%s\" (K-Line)", reason);
+			return Reject_Reason;
+	}
+	return reason;
 }
 
+/**
+ * Check if a client is banned from this server: GLINE, KLINE.
+ *
+ * If a client isn't allowed to connect, it will be disconnected again.
+ *
+ * @param Client The client to check.
+ * @return CONNECTED if client is allowed to join, DISCONNECTED if not.
+ */
+GLOBAL bool
+Class_HandleServerBans(CLIENT *Client)
+{
+	char *rejectptr;
+
+	assert(Client != NULL);
+
+	rejectptr = Class_GetMemberReason(CLASS_GLINE, Client);
+	if (!rejectptr)
+		rejectptr = Class_GetMemberReason(CLASS_KLINE, Client);
+	if (rejectptr) {
+		Client_Reject(Client, rejectptr, true);
+		return DISCONNECTED;
+	}
+
+	return CONNECTED;
+}
+
+
 GLOBAL bool
 Class_AddMask(const int Class, const char *Mask, time_t ValidUntil,
 	      const char *Reason)

src/ngircd/class.h

@@ -1,6 +1,6 @@
 /*
  * ngIRCd -- The Next Generation IRC Daemon
- * Copyright (c)2001-2011 Alexander Barton (alex@barton.de) and Contributors.
+ * Copyright (c)2001-2012 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
@@ -29,7 +29,8 @@ GLOBAL bool Class_AddMask PARAMS((const int Class, const char *Mask,
 				  const time_t ValidUntil, const char *Reason));
 GLOBAL void Class_DeleteMask PARAMS((const int Class, const char *Mask));
 
-GLOBAL bool Class_IsMember PARAMS((const int Class, CLIENT *Client));
+GLOBAL char *Class_GetMemberReason PARAMS((const int Class, CLIENT *Client));
+GLOBAL bool Class_HandleServerBans PARAMS((CLIENT *Client));
 
 GLOBAL struct list_head *Class_GetList PARAMS((const int Class));
 

src/ngircd/irc-login.c

@@ -47,7 +47,6 @@ static bool Hello_User PARAMS(( CLIENT *Client ));
 static bool Hello_User_PostAuth PARAMS(( CLIENT *Client ));
 static void Kill_Nick PARAMS(( char *Nick, char *Reason ));
 static void Introduce_Client PARAMS((CLIENT *To, CLIENT *Client, int Type));
-static void Reject_Client PARAMS((CLIENT *Client, const char *InternalReason));
 
 static void cb_introduceClient PARAMS((CLIENT *Client, CLIENT *Prefix,
 				       void *i));
@@ -945,7 +944,7 @@ Hello_User(CLIENT * Client)
 		 * passwords supplied are classified as "wrong". */
 		if(Client_Password(Client)[0] == '\0')
 			return Hello_User_PostAuth(Client);
-		Reject_Client(Client, "non-empty password");
+		Client_Reject(Client, "Non-empty password", false);
 		return DISCONNECTED;
 	}
 
@@ -981,7 +980,7 @@ Hello_User(CLIENT * Client)
 	/* Check global server password ... */
 	if (strcmp(Client_Password(Client), Conf_ServerPwd) != 0) {
 		/* Bad password! */
-		Reject_Client(Client, "bad server password");
+		Client_Reject(Client, "Bad server password", false);
 		return DISCONNECTED;
 	}
 	return Hello_User_PostAuth(Client);
@@ -1026,7 +1025,7 @@ cb_Read_Auth_Result(int r_fd, UNUSED short events)
 
 	if (len != sizeof(result)) {
 		Log(LOG_CRIT, "Auth: Got malformed result!");
-		Reject_Client(client, "internal error");
+		Client_Reject(client, "Internal error", false);
 		return;
 	}
 
@@ -1034,31 +1033,12 @@ cb_Read_Auth_Result(int r_fd, UNUSED short events)
 		Client_SetUser(client, Client_OrigUser(client), true);
 		(void)Hello_User_PostAuth(client);
 	} else
-		Reject_Client(client, "bad password");
+		Client_Reject(client, "Bad password", false);
 }
 
 #endif
 
 
-/**
- * Reject a client because of wrong password.
- *
- * This function is called either when the global server password or a password
- * checked using PAM has been wrong.
- *
- * @param Client	The client to reject.
- */
-static void
-Reject_Client(CLIENT *Client, const char *InternalReason)
-{
-	Log(LOG_ERR,
-	    "User \"%s\" rejected (connection %d): %s!",
-	    Client_Mask(Client), Client_Conn(Client), InternalReason);
-	Conn_Close(Client_Conn(Client), InternalReason,
-		   "Access denied! Bad password?", true);
-}
-
-
 /**
  * Finish client registration.
  *
@@ -1071,14 +1051,10 @@ Reject_Client(CLIENT *Client, const char *InternalReason)
 static bool
 Hello_User_PostAuth(CLIENT *Client)
 {
-	if (Class_IsMember(CLASS_GLINE, Client)) {
-		Reject_Client(Client, "G-Line'd");
+	assert(Client != NULL);
+
+	if (Class_HandleServerBans(Client) != CONNECTED)
 		return DISCONNECTED;
-	}
-	if (Class_IsMember(CLASS_KLINE, Client)) {
-		Reject_Client(Client, "K-Line'd");
-		return DISCONNECTED;
-	}
 
 	Introduce_Client(NULL, Client, CLIENT_USER);