removed one more hack that - as usual - almost always worked

(but broke permission handling for *some* IP's after we started to compare in utf8)
Bug #1636

sql/sql_acl.cc

@@ -52,7 +52,8 @@ static byte* acl_entry_get_key(acl_entry *entry,uint *length,
   return (byte*) entry->key;
 }
 
-#define ACL_KEY_LENGTH (sizeof(long)+NAME_LEN+USERNAME_LENGTH+1)
+#define IP_ADDR_STRLEN
+#define ACL_KEY_LENGTH (IP_ADDR_STRLEN+1+NAME_LEN+1+USERNAME_LENGTH+1)
 
 static DYNAMIC_ARRAY acl_hosts,acl_users,acl_dbs;
 static MEM_ROOT mem, memex;
@@ -909,7 +910,7 @@ static void acl_insert_db(const char *user, const char *host, const char *db,
   Get privilege for a host, user and db combination
 */
 
-ulong acl_get(const char *host, const char *ip, const char *bin_ip,
+ulong acl_get(const char *host, const char *ip,
 	     const char *user, const char *db, my_bool db_is_pattern)
 {
   ulong host_access,db_access;
@@ -919,8 +920,7 @@ ulong acl_get(const char *host, const char *ip, const char *bin_ip,
   acl_entry *entry;
 
   VOID(pthread_mutex_lock(&acl_cache->lock));
-  memcpy_fixed(&key,bin_ip,sizeof(struct in_addr));
-  end=strmov((tmp_db=strmov(key+sizeof(struct in_addr),user)+1),db);
+  end=strmov((tmp_db=strmov(strmov(key, ip ? ip : "")+1,user)+1),db);
   if (lower_case_table_names)
   {
     my_casedn_str(&my_charset_latin1, tmp_db);
@@ -1331,7 +1331,7 @@ static bool test_if_create_new_users(THD *thd)
     bzero((char*) &tl,sizeof(tl));
     tl.db=	   (char*) "mysql";
     tl.real_name=  (char*) "user";
-    db_access=acl_get(thd->host, thd->ip, (char*) &thd->remote.sin_addr,
+    db_access=acl_get(thd->host, thd->ip,
 		      thd->priv_user, tl.db, 0);
     if (!(db_access & INSERT_ACL))
     {

sql/sql_acl.h

@@ -134,7 +134,7 @@ public:
 my_bool  acl_init(THD *thd, bool dont_read_acl_tables);
 void acl_reload(THD *thd);
 void acl_free(bool end=0);
-ulong acl_get(const char *host, const char *ip, const char *bin_ip,
+ulong acl_get(const char *host, const char *ip,
 	      const char *user, const char *db, my_bool db_is_pattern);
 int acl_getroot(THD *thd, USER_RESOURCES *mqh, const char *passwd,
                 uint passwd_len);

sql/sql_db.cc

@@ -618,8 +618,7 @@ bool mysql_change_db(THD *thd, const char *name)
   if (test_all_bits(thd->master_access,DB_ACLS))
     db_access=DB_ACLS;
   else
-    db_access= (acl_get(thd->host,thd->ip,(char*) &thd->remote.sin_addr,
-			thd->priv_user,dbname,0) |
+    db_access= (acl_get(thd->host,thd->ip, thd->priv_user,dbname,0) |
 		thd->master_access);
   if (!(db_access & DB_ACLS) && (!grant_option || check_grant_db(thd,dbname)))
   {
@@ -684,8 +683,7 @@ int mysqld_show_create_db(THD *thd, char *dbname,
   if (test_all_bits(thd->master_access,DB_ACLS))
     db_access=DB_ACLS;
   else
-    db_access= (acl_get(thd->host,thd->ip,(char*) &thd->remote.sin_addr,
-			thd->priv_user,dbname,0) |
+    db_access= (acl_get(thd->host,thd->ip, thd->priv_user,dbname,0) |
 		thd->master_access);
   if (!(db_access & DB_ACLS) && (!grant_option || check_grant_db(thd,dbname)))
   {

sql/sql_parse.cc

@@ -3376,7 +3376,7 @@ check_access(THD *thd, ulong want_access, const char *db, ulong *save_priv,
     db_access= thd->db_access;
     if (!(thd->master_access & SELECT_ACL) &&
 	(db && (!thd->db || strcmp(db,thd->db))))
-      db_access=acl_get(thd->host, thd->ip, (char*) &thd->remote.sin_addr,
+      db_access=acl_get(thd->host, thd->ip,
 			thd->priv_user, db, test(want_access & GRANT_ACL));
     *save_priv=thd->master_access | db_access;
     DBUG_RETURN(FALSE);
@@ -3396,7 +3396,7 @@ check_access(THD *thd, ulong want_access, const char *db, ulong *save_priv,
     DBUG_RETURN(FALSE);				// Allow select on anything
 
   if (db && (!thd->db || strcmp(db,thd->db)))
-    db_access=acl_get(thd->host, thd->ip, (char*) &thd->remote.sin_addr,
+    db_access=acl_get(thd->host, thd->ip,
 		      thd->priv_user, db, test(want_access & GRANT_ACL));
   else
     db_access=thd->db_access;

sql/sql_show.cc

@@ -75,8 +75,7 @@ mysqld_show_dbs(THD *thd,const char *wild)
   {
 #ifndef NO_EMBEDDED_ACCESS_CHECKS
     if (thd->master_access & (DB_ACLS | SHOW_DB_ACL) ||
-	acl_get(thd->host, thd->ip, (char*) &thd->remote.sin_addr,
-		thd->priv_user, file_name,0) ||
+	acl_get(thd->host, thd->ip, thd->priv_user, file_name,0) ||
 	(grant_option && !check_grant_db(thd, file_name)))
 #endif
     {