Bug#11835 CREATE FUNCTION crashes server

 - Update for 5.1
 - Add "have_dlopen"
 - Remove requirement to load udf's only in "opt_plugin_dir" 


include/my_global.h:
  Remove duplicate defines
mysql-test/include/have_udf.inc:
  Use "have_dlopen" to check if we "have udf"
mysql-test/r/have_udf.require:
  Use "have_dlopen" to check if we "have udf"
mysql-test/r/udf.result:
  Update for new error message "function"->"symbol"
sql/item_func.cc:
  Remove "evil" dbug printour that checks args[0] even if arg_count is 0
sql/mysql_priv.h:
  Add "have_dlopen"
sql/mysqld.cc:
  Add "have_dlopen"
  Move HAVE_DLOPEN defined to only surround "udf_free" and "udf_init"
sql/set_var.cc:
  Add "have_dlopen"
sql/sql_plugin.cc:
  Surround 'dlclose' with HAVE_DLOPEN
sql/sql_udf.cc:
  Remove the requirement to load udf's only from "opt_plugin_dir".
  Fix spelling error

include/my_global.h

@@ -1443,13 +1443,4 @@ do { doubleget_union _tmp; \
 #define dlerror() ""
 #endif
 
-/* FreeBSD 2.2.2 does not define RTLD_NOW) */
-#ifndef RTLD_NOW
-#define RTLD_NOW 1
-#endif
-
-#ifndef HAVE_DLERROR
-#define dlerror() ""
-#endif
-
 #endif /* my_global_h */

mysql-test/include/have_udf.inc

 #
-# To check if the udf_example.so is available,
-# try to load one function from it.
-#
+# Check if server has support for loading udf's
+# i.e it will support dlopen
 #
 --require r/have_udf.require
---disable_abort_on_error
-CREATE FUNCTION metaphon RETURNS STRING SONAME 'udf_example.so';
---disable_query_log
-DROP FUNCTION metaphon;
---enable_query_log
---enable_abort_on_error
+disable_query_log;
+show variables like "have_dlopen";
+enable_query_log;

mysql-test/r/have_udf.require

-CREATE FUNCTION metaphon RETURNS STRING SONAME 'udf_example.so';
+Variable_name	Value
+have_dlopen	YES

mysql-test/r/udf.result

@@ -2,7 +2,7 @@ drop table if exists t1;
 CREATE FUNCTION metaphon RETURNS STRING SONAME 'udf_example.so';
 CREATE FUNCTION myfunc_double RETURNS REAL SONAME 'udf_example.so';
 CREATE FUNCTION myfunc_nonexist RETURNS INTEGER SONAME 'udf_example.so';
-ERROR HY000: Can't find function 'myfunc_nonexist' in library
+ERROR HY000: Can't find symbol 'myfunc_nonexist' in library
 CREATE FUNCTION myfunc_int RETURNS INTEGER SONAME 'udf_example.so';
 CREATE FUNCTION sequence RETURNS INTEGER SONAME "udf_example.so";
 CREATE FUNCTION lookup RETURNS STRING SONAME 'udf_example.so';

sql/item_func.cc

@@ -2807,9 +2807,6 @@ longlong Item_func_udf_int::val_int()
 {
   DBUG_ASSERT(fixed == 1);
   DBUG_ENTER("Item_func_udf_int::val_int");
-  DBUG_PRINT("info",("result_type: %d  arg_count: %d",
-		     args[0]->result_type(), arg_count));
-
   DBUG_RETURN(udf.val_int(&null_value));
 }
 

sql/mysql_priv.h

@@ -1444,7 +1444,7 @@ extern handlerton myisammrg_hton;
 extern handlerton heap_hton;
 
 extern SHOW_COMP_OPTION have_row_based_replication;
-extern SHOW_COMP_OPTION have_raid, have_openssl, have_symlink;
+extern SHOW_COMP_OPTION have_raid, have_openssl, have_symlink, have_dlopen;
 extern SHOW_COMP_OPTION have_query_cache;
 extern SHOW_COMP_OPTION have_geometry, have_rtree_keys;
 extern SHOW_COMP_OPTION have_crypt;

sql/mysqld.cc

@@ -564,7 +564,7 @@ CHARSET_INFO *national_charset_info, *table_alias_charset;
 CHARSET_INFO *character_set_filesystem;
 
 SHOW_COMP_OPTION have_row_based_replication;
-SHOW_COMP_OPTION have_openssl, have_symlink, have_query_cache;
+SHOW_COMP_OPTION have_openssl, have_symlink, have_dlopen, have_query_cache;
 SHOW_COMP_OPTION have_geometry, have_rtree_keys;
 SHOW_COMP_OPTION have_crypt, have_compress;
 
@@ -1163,13 +1163,13 @@ void clean_up(bool print_message)
   set_var_free();
   free_charsets();
   (void) ha_panic(HA_PANIC_CLOSE);	/* close all tables and logs */
-#ifdef HAVE_DLOPEN
   if (!opt_noacl)
   {
+#ifdef HAVE_DLOPEN
     udf_free();
-  }
 #endif
-  plugin_free();
+    plugin_free();
+  }
   if (tc_log)
     tc_log->close();
   xid_cache_free();
@@ -7078,6 +7078,11 @@ static void mysql_init_variables(void)
 #else
   have_symlink=SHOW_OPTION_YES;
 #endif
+#ifdef HAVE_DLOPEN
+  have_dlopen=SHOW_OPTION_YES;
+#else
+  have_dlopen=SHOW_OPTION_NO;
+#endif
 #ifdef HAVE_QUERY_CACHE
   have_query_cache=SHOW_OPTION_YES;
 #else

sql/set_var.cc

@@ -630,6 +630,7 @@ sys_var_have_variable sys_have_blackhole_db("have_blackhole_engine",
 sys_var_have_variable sys_have_compress("have_compress", &have_compress);
 sys_var_have_variable sys_have_crypt("have_crypt", &have_crypt);
 sys_var_have_variable sys_have_csv_db("have_csv", &have_csv_db);
+sys_var_have_variable sys_have_dlopen("have_dlopen", &have_dlopen);
 sys_var_have_variable sys_have_example_db("have_example_engine",
                                           &have_example_db);
 sys_var_have_variable sys_have_federated_db("have_federated_engine",
@@ -754,6 +755,7 @@ SHOW_VAR init_vars[]= {
   {sys_have_compress.name,    (char*) &have_compress,               SHOW_HAVE},
   {sys_have_crypt.name,       (char*) &have_crypt,                  SHOW_HAVE},
   {sys_have_csv_db.name,      (char*) &have_csv_db,                 SHOW_HAVE},
+  {sys_have_dlopen.name,      (char*) &have_dlopen,                 SHOW_HAVE},
   {sys_have_example_db.name,  (char*) &have_example_db,             SHOW_HAVE},
   {sys_have_federated_db.name,(char*) &have_federated_db,           SHOW_HAVE},
   {sys_have_geometry.name,    (char*) &have_geometry,               SHOW_HAVE},

sql/sql_plugin.cc

@@ -94,8 +94,10 @@ static st_plugin_dl *plugin_dl_insert_or_reuse(struct st_plugin_dl *plugin_dl)
 
 static inline void free_plugin_mem(struct st_plugin_dl *p)
 {
+#ifdef HAVE_DLOPEN
   if (p->handle)
     dlclose(p->handle);
+#endif
   my_free(p->dl.str, MYF(MY_ALLOW_ZERO_PTR));
   if (p->version != MYSQL_PLUGIN_INTERFACE_VERSION)
     my_free((gptr)p->plugins, MYF(MY_ALLOW_ZERO_PTR));

sql/sql_udf.cc

@@ -114,7 +114,7 @@ void udf_init()
   READ_RECORD read_record_info;
   TABLE *table;
   int error;
-  DBUG_ENTER("ufd_init");
+  DBUG_ENTER("udf_init");
 
   if (initialized)
     DBUG_VOID_RETURN;
@@ -177,7 +177,6 @@ void udf_init()
       continue;
     }
 
-
     if (!(tmp= add_udf(&name,(Item_result) table->field[1]->val_int(),
                        dl_name, udftype)))
     {
@@ -188,13 +187,10 @@ void udf_init()
     void *dl = find_udf_dl(tmp->dl);
     if (dl == NULL)
     {
-      char dlpath[FN_REFLEN];
-      strxnmov(dlpath, sizeof(dlpath) - 1, opt_plugin_dir, "/", tmp->dl,
-               NullS);
-      if (!(dl= dlopen(dlpath, RTLD_NOW)))
+      if (!(dl= dlopen(tmp->dl, RTLD_NOW)))
       {
 	/* Print warning to log */
-	sql_print_error(ER(ER_CANT_OPEN_LIBRARY), dlpath, errno, dlerror());
+	sql_print_error(ER(ER_CANT_OPEN_LIBRARY), tmp->dl, errno, dlerror());
 	/* Keep the udf in the hash so that we can remove it later */
 	continue;
       }
@@ -415,14 +411,12 @@ int mysql_create_function(THD *thd,udf_func *udf)
   }
   if (!(dl = find_udf_dl(udf->dl)))
   {
-    char dlpath[FN_REFLEN];
-    strxnmov(dlpath, sizeof(dlpath) - 1, opt_plugin_dir, "/", udf->dl, NullS);
-    if (!(dl = dlopen(dlpath, RTLD_NOW)))
+    if (!(dl = dlopen(udf->dl, RTLD_NOW)))
     {
       DBUG_PRINT("error",("dlopen of %s failed, error: %d (%s)",
-			  dlpath, errno, dlerror()));
+			  udf->dl, errno, dlerror()));
       my_error(ER_CANT_OPEN_LIBRARY, MYF(0),
-                      dlpath, errno, dlerror());
+               udf->dl, errno, dlerror());
       goto err;
     }
     new_dl=1;