From 537b66ad992f7094793c7e025af4d06b30ef35ee Mon Sep 17 00:00:00 2001
From: w00t <w00t@e03df62e-2008-0410-955e-edbf42e46eb7>
Date: Wed, 4 Jan 2006 05:52:34 +0000
Subject: [PATCH] Revise some serious craq++ in AddBan

git-svn-id: http://svn.inspircd.org/repository/trunk/inspircd@2730 e03df62e-2008-0410-955e-edbf42e46eb7
---
 src/mode.cpp | 35 ++++++++++++++++++-----------------
 1 file changed, 18 insertions(+), 17 deletions(-)

diff --git a/src/mode.cpp b/src/mode.cpp
index 3302b0042..24531651a 100644
--- a/src/mode.cpp
+++ b/src/mode.cpp
@@ -370,35 +370,36 @@ char* ModeParser::TakeVoice(userrec *user,char *dest,chanrec *chan,int status)
 
 char* ModeParser::AddBan(userrec *user,char *dest,chanrec *chan,int status)
 {
-	if ((!user) || (!dest) || (!chan) || (!*dest)) {
+	BanItem b;
+	unsigned int l;
+	int toomanyexclamation = 0;
+	int toomanyat = 0;
+
+	if ((!user) || (!dest) || (!chan) || (!*dest))
+	{
 		log(DEFAULT,"*** BUG *** AddBan was given an invalid parameter");
 		return NULL;
 	}
 
-	BanItem b;
+	l = strlen(dest);
 
-	unsigned int l = strlen(dest);
-	if (strchr(dest,'!')==0)
-		return NULL;
-	if (strchr(dest,'@')==0)
-		return NULL;
 	for (unsigned int i = 0; i < l; i++)
+	{
 		if (dest[i] < 32)
 			return NULL;
-	for (unsigned int i = 0; i < l; i++)
 		if (dest[i] > 126)
 			return NULL;
-	int c = 0;
-	for (unsigned int i = 0; i < l; i++)
 		if (dest[i] == '!')
-			c++;
-	if (c>1)
-		return NULL;
-	c = 0;
-	for (unsigned int i = 0; i < l; i++)
+			toomanyexclamation++;
 		if (dest[i] == '@')
-			c++;
-	if (c>1)
+			toomanyat++;
+	}
+
+	if (toomanyexclamation != 1 || toomanyat != 1)
+		/*
+		 * this stops sillyness like n!u!u!u@h, though note that most
+		 * ircds don't actually verify banmask validity. --w00t
+		 */
 		return NULL;
 
 	long maxbans = GetMaxBans(chan->name);
-- 
2.39.5