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/*
Unix SMB/CIFS implementation.
store smbd profiling information in shared memory
Copyright (C) Andrew Tridgell 1999
Copyright (C) James Peach 2006
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 "system/shmem.h"
#include "system/filesys.h"
#include "messages.h"
#include "smbprofile.h"
#define PROF_SHMEM_KEY ((key_t)0x07021999)
#define PROF_SHM_MAGIC 0x6349985
#define PROF_SHM_VERSION 15
#define IPC_PERMS ((S_IRUSR | S_IWUSR) | S_IRGRP | S_IROTH)
static int shm_id;
static bool read_only;
struct profile_header {
int prof_shm_magic;
int prof_shm_version;
struct profile_stats stats;
};
static struct profile_header *profile_h;
struct profile_stats *profile_p;
bool do_profile_flag = False;
bool do_profile_times = False;
/****************************************************************************
Set a profiling level.
****************************************************************************/
void set_profile_level(int level, struct server_id src)
{
switch (level) {
case 0: /* turn off profiling */
do_profile_flag = False;
do_profile_times = False;
DEBUG(1,("INFO: Profiling turned OFF from pid %d\n",
(int)procid_to_pid(&src)));
break;
case 1: /* turn on counter profiling only */
do_profile_flag = True;
do_profile_times = False;
DEBUG(1,("INFO: Profiling counts turned ON from pid %d\n",
(int)procid_to_pid(&src)));
break;
case 2: /* turn on complete profiling */
do_profile_flag = True;
do_profile_times = True;
DEBUG(1,("INFO: Full profiling turned ON from pid %d\n",
(int)procid_to_pid(&src)));
break;
case 3: /* reset profile values */
memset((char *)profile_p, 0, sizeof(*profile_p));
DEBUG(1,("INFO: Profiling values cleared from pid %d\n",
(int)procid_to_pid(&src)));
break;
}
}
/****************************************************************************
receive a set profile level message
****************************************************************************/
static void profile_message(struct messaging_context *msg_ctx,
void *private_data,
uint32_t msg_type,
struct server_id src,
DATA_BLOB *data)
{
int level;
if (data->length != sizeof(level)) {
DEBUG(0, ("got invalid profile message\n"));
return;
}
memcpy(&level, data->data, sizeof(level));
set_profile_level(level, src);
}
/****************************************************************************
receive a request profile level message
****************************************************************************/
static void reqprofile_message(struct messaging_context *msg_ctx,
void *private_data,
uint32_t msg_type,
struct server_id src,
DATA_BLOB *data)
{
int level;
level = 1 + (do_profile_flag?2:0) + (do_profile_times?4:0);
DEBUG(1,("INFO: Received REQ_PROFILELEVEL message from PID %u\n",
(unsigned int)procid_to_pid(&src)));
messaging_send_buf(msg_ctx, src, MSG_PROFILELEVEL,
(uint8 *)&level, sizeof(level));
}
/*******************************************************************
open the profiling shared memory area
******************************************************************/
bool profile_setup(struct messaging_context *msg_ctx, bool rdonly)
{
struct shmid_ds shm_ds;
read_only = rdonly;
again:
/* try to use an existing key */
shm_id = shmget(PROF_SHMEM_KEY, 0, 0);
/* if that failed then create one. There is a race condition here
if we are running from inetd. Bad luck. */
if (shm_id == -1) {
if (read_only) return False;
shm_id = shmget(PROF_SHMEM_KEY, sizeof(*profile_h),
IPC_CREAT | IPC_EXCL | IPC_PERMS);
}
if (shm_id == -1) {
DEBUG(0,("Can't create or use IPC area. Error was %s\n",
strerror(errno)));
return False;
}
profile_h = (struct profile_header *)shmat(shm_id, 0,
read_only?SHM_RDONLY:0);
if ((long)profile_h == -1) {
DEBUG(0,("Can't attach to IPC area. Error was %s\n",
strerror(errno)));
return False;
}
/* find out who created this memory area */
if (shmctl(shm_id, IPC_STAT, &shm_ds) != 0) {
DEBUG(0,("ERROR shmctl : can't IPC_STAT. Error was %s\n",
strerror(errno)));
return False;
}
if (shm_ds.shm_perm.cuid != sec_initial_uid() ||
shm_ds.shm_perm.cgid != sec_initial_gid()) {
DEBUG(0,("ERROR: we did not create the shmem "
"(owned by another user, uid %u, gid %u)\n",
shm_ds.shm_perm.cuid,
shm_ds.shm_perm.cgid));
return False;
}
if (shm_ds.shm_segsz != sizeof(*profile_h)) {
DEBUG(0,("WARNING: profile size is %d (expected %d). Deleting\n",
(int)shm_ds.shm_segsz, (int)sizeof(*profile_h)));
if (shmctl(shm_id, IPC_RMID, &shm_ds) == 0) {
goto again;
} else {
return False;
}
}
if (!read_only && (shm_ds.shm_nattch == 1)) {
memset((char *)profile_h, 0, sizeof(*profile_h));
profile_h->prof_shm_magic = PROF_SHM_MAGIC;
profile_h->prof_shm_version = PROF_SHM_VERSION;
DEBUG(3,("Initialised profile area\n"));
}
profile_p = &profile_h->stats;
if (msg_ctx != NULL) {
messaging_register(msg_ctx, NULL, MSG_PROFILE,
profile_message);
messaging_register(msg_ctx, NULL, MSG_REQ_PROFILELEVEL,
reqprofile_message);
}
return True;
}
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