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/*
Unix SMB/Netbios implementation.
Perfcounter initialization and support functions
Copyright (C) Todd Stecher 2009
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
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "includes.h"
#include "smbd/smbd.h"
static struct smb_perfcount_handlers *g_smb_perfcount_handlers = NULL;
struct smb_perfcount_module {
char *name;
struct smb_perfcount_handlers *handlers;
struct smb_perfcount_module *prev, *next;
};
struct smb_perfcount_module *modules = NULL;
/*
* a module is registered before it is actually loaded - keep a list
*
* @todo - currently perfcount modules are globally configured, so
* building the list is not strictly required.
* However, its a proven concept in VFS, and is here to allow a
* move to eventual per-service perfcount configuration.
*
* Note many pre-connection statistics are interesting
* (e.g. before binding to an individual share).
*
*/
static struct smb_perfcount_module *smb_perfcount_find_module(const char *name)
{
struct smb_perfcount_module *entry = modules;
while (entry) {
if (strcmp(entry->name, name)==0)
return entry;
entry = entry->next;
}
return NULL;
}
NTSTATUS smb_register_perfcounter(int interface_version, const char *name,
const struct smb_perfcount_handlers *handlers)
{
struct smb_perfcount_module *entry = modules;
if (interface_version != SMB_PERFCOUNTER_INTERFACE_VERSION) {
DEBUG(0, ("Failed to register perfcount module.\n"
"The module was compiled against "
"SMB_PERFCOUNTER_INTERFACE_VERSION %d,\n"
"current SMB_PERFCOUNTER_INTERFACE_VERSION is %d.\n"
"Please recompile against the current Samba Version!\n",
interface_version, SMB_PERFCOUNTER_INTERFACE_VERSION));
return NT_STATUS_OBJECT_TYPE_MISMATCH;
}
if (!name || !name[0] || !handlers) {
DEBUG(0,("smb_register_perfcounter() called with NULL pointer "
"or empty name!\n"));
return NT_STATUS_INVALID_PARAMETER;
}
if (smb_perfcount_find_module(name)) {
DEBUG(3,("Perfcount Module %s already loaded!\n", name));
return NT_STATUS_OK;
}
entry = SMB_XMALLOC_P(struct smb_perfcount_module);
entry->name = smb_xstrdup(name);
entry->handlers = discard_const_p(struct smb_perfcount_handlers, handlers);
DLIST_ADD(modules, entry);
DEBUG(3, ("Successfully added perfcounter module '%s'\n", name));
return NT_STATUS_OK;
}
/****************************************************************************
initialise smb perf counters
****************************************************************************/
static bool smb_load_perfcount_module(const char *name)
{
char *module_path = NULL;
char *module_name = NULL;
char *module_param = NULL, *p;
const struct smb_perfcount_module *entry;
DEBUG(3, ("Initialising perfcounter module [%s]\n", name));
if (g_smb_perfcount_handlers) {
DEBUG(3,("Only 1 perfcount handler may be registered in "
"smb.conf\n"));
return true;
}
module_path = smb_xstrdup(name);
p = strchr_m(module_path, ':');
if (p) {
*p = 0;
module_param = p+1;
trim_char(module_param, ' ', ' ');
}
trim_char(module_path, ' ', ' ');
module_name = smb_xstrdup(module_path);
if (module_name[0] == '/') {
/*
* Extract the module name from the path. Just use the base
* name of the last path component.
*/
SAFE_FREE(module_name);
module_name = smb_xstrdup(strrchr_m(module_path, '/')+1);
p = strchr_m(module_name, '.');
if (p != NULL) {
*p = '\0';
}
}
/* load the perfcounter module */
if((entry = smb_perfcount_find_module(module_name)) ||
(NT_STATUS_IS_OK(smb_probe_module_absolute_path(module_path)) &&
(entry = smb_perfcount_find_module(module_name)))) {
DEBUG(3,("Successfully loaded perfcounter module [%s] \n", name));
} else {
DEBUG(0,("Can't find a perfcounter module [%s]\n",name));
goto fail;
}
g_smb_perfcount_handlers = entry->handlers;
SAFE_FREE(module_path);
SAFE_FREE(module_name);
return True;
fail:
SAFE_FREE(module_path);
SAFE_FREE(module_name);
return False;
}
void smb_init_perfcount_data(struct smb_perfcount_data *pcd)
{
ZERO_STRUCTP(pcd);
pcd->handlers = g_smb_perfcount_handlers;
}
bool smb_perfcount_init(void)
{
const struct loadparm_substitution *lp_sub =
loadparm_s3_global_substitution();
char *perfcount_object;
perfcount_object = lp_perfcount_module(talloc_tos(), lp_sub);
/* don't init */
if (!perfcount_object || !perfcount_object[0])
return True;
if (!smb_load_perfcount_module(perfcount_object)) {
DEBUG(0, ("smbd_load_percount_module failed for %s\n",
perfcount_object));
return False;
}
return True;
}
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