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/*
* util/shm_side/shm_main.c - SHM for statistics transport
*
* Copyright (c) 2017, NLnet Labs. All rights reserved.
*
* This software is open source.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
*
* Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* Neither the name of the NLNET LABS nor the names of its contributors may
* be used to endorse or promote products derived from this software without
* specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
* TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
/**
* \file
*
* This file contains functions for the SHM implementation.
*/
#include "config.h"
#include <ctype.h>
#include <stdarg.h>
#ifdef HAVE_SYS_IPC_H
#include <sys/ipc.h>
#endif
#ifdef HAVE_SYS_SHM_H
#include <sys/shm.h>
#endif
#include <sys/time.h>
#include <errno.h>
#include "shm_main.h"
#include "daemon/daemon.h"
#include "daemon/worker.h"
#include "daemon/stats.h"
#include "services/mesh.h"
#include "services/cache/rrset.h"
#include "services/cache/infra.h"
#include "validator/validator.h"
#include "util/config_file.h"
#include "util/fptr_wlist.h"
#include "util/log.h"
#ifdef HAVE_SHMGET
/** subtract timers and the values do not overflow or become negative */
static void
stat_timeval_subtract(long long *d_sec, long long *d_usec, const struct timeval* end,
const struct timeval* start)
{
#ifndef S_SPLINT_S
time_t end_usec = end->tv_usec;
*d_sec = end->tv_sec - start->tv_sec;
if(end_usec < start->tv_usec) {
end_usec += 1000000;
(*d_sec)--;
}
*d_usec = end_usec - start->tv_usec;
#endif
}
#endif /* HAVE_SHMGET */
int shm_main_init(struct daemon* daemon)
{
#ifdef HAVE_SHMGET
struct ub_shm_stat_info *shm_stat;
size_t shm_size;
/* sanitize */
if(!daemon)
return 0;
if(!daemon->cfg->shm_enable)
return 1;
if(daemon->cfg->stat_interval == 0)
log_warn("shm-enable is yes but statistics-interval is 0");
/* Statistics to maintain the number of thread + total */
shm_size = (sizeof(struct ub_stats_info) * (daemon->num + 1));
/* Allocation of needed memory */
daemon->shm_info = (struct shm_main_info*)calloc(1, shm_size);
/* Sanitize */
if(!daemon->shm_info) {
log_err("shm fail: malloc failure");
return 0;
}
daemon->shm_info->key = daemon->cfg->shm_key;
/* Check for previous create SHM */
daemon->shm_info->id_ctl = shmget(daemon->shm_info->key, sizeof(int), SHM_R);
daemon->shm_info->id_arr = shmget(daemon->shm_info->key + 1, sizeof(int), SHM_R);
/* Destroy previous SHM */
if (daemon->shm_info->id_ctl >= 0)
shmctl(daemon->shm_info->id_ctl, IPC_RMID, NULL);
/* Destroy previous SHM */
if (daemon->shm_info->id_arr >= 0)
shmctl(daemon->shm_info->id_arr, IPC_RMID, NULL);
/* SHM: Create the segment */
daemon->shm_info->id_ctl = shmget(daemon->shm_info->key, sizeof(struct ub_shm_stat_info), IPC_CREAT | 0644);
if (daemon->shm_info->id_ctl < 0)
{
log_err("SHM failed(id_ctl) cannot shmget(key %d) %s",
daemon->shm_info->key, strerror(errno));
/* Just release memory unused */
free(daemon->shm_info);
return 0;
}
daemon->shm_info->id_arr = shmget(daemon->shm_info->key + 1, shm_size, IPC_CREAT | 0644);
if (daemon->shm_info->id_arr < 0)
{
log_err("SHM failed(id_arr) cannot shmget(key %d + 1) %s",
daemon->shm_info->key, strerror(errno));
/* Just release memory unused */
free(daemon->shm_info);
return 0;
}
/* SHM: attach the segment */
daemon->shm_info->ptr_ctl = (struct ub_shm_stat_info*)
shmat(daemon->shm_info->id_ctl, NULL, 0);
if(daemon->shm_info->ptr_ctl == (void *) -1) {
log_err("SHM failed(ctl) cannot shmat(%d) %s",
daemon->shm_info->id_ctl, strerror(errno));
/* Just release memory unused */
free(daemon->shm_info);
return 0;
}
daemon->shm_info->ptr_arr = (struct ub_stats_info*)
shmat(daemon->shm_info->id_arr, NULL, 0);
if (daemon->shm_info->ptr_arr == (void *) -1)
{
log_err("SHM failed(arr) cannot shmat(%d) %s",
daemon->shm_info->id_arr, strerror(errno));
/* Just release memory unused */
free(daemon->shm_info);
return 0;
}
/* Zero fill SHM to stand clean while is not filled by other events */
memset(daemon->shm_info->ptr_ctl, 0, sizeof(struct ub_shm_stat_info));
memset(daemon->shm_info->ptr_arr, 0, shm_size);
shm_stat = daemon->shm_info->ptr_ctl;
shm_stat->num_threads = daemon->num;
#else
(void)daemon;
#endif /* HAVE_SHMGET */
return 1;
}
void shm_main_shutdown(struct daemon* daemon)
{
#ifdef HAVE_SHMGET
/* web are OK, just disabled */
if(!daemon->cfg->shm_enable)
return;
verbose(VERB_DETAIL, "SHM shutdown - KEY [%d] - ID CTL [%d] ARR [%d] - PTR CTL [%p] ARR [%p]",
daemon->shm_info->key, daemon->shm_info->id_ctl, daemon->shm_info->id_arr, daemon->shm_info->ptr_ctl, daemon->shm_info->ptr_arr);
/* Destroy previous SHM */
if (daemon->shm_info->id_ctl >= 0)
shmctl(daemon->shm_info->id_ctl, IPC_RMID, NULL);
if (daemon->shm_info->id_arr >= 0)
shmctl(daemon->shm_info->id_arr, IPC_RMID, NULL);
if (daemon->shm_info->ptr_ctl)
shmdt(daemon->shm_info->ptr_ctl);
if (daemon->shm_info->ptr_arr)
shmdt(daemon->shm_info->ptr_arr);
#else
(void)daemon;
#endif /* HAVE_SHMGET */
}
void shm_main_run(struct worker *worker)
{
#ifdef HAVE_SHMGET
struct ub_shm_stat_info *shm_stat;
struct ub_stats_info *stat_total;
struct ub_stats_info *stat_info;
int offset;
#ifndef S_SPLINT_S
verbose(VERB_DETAIL, "SHM run - worker [%d] - daemon [%p] - timenow(%u) - timeboot(%u)",
worker->thread_num, worker->daemon, (unsigned)worker->env.now_tv->tv_sec, (unsigned)worker->daemon->time_boot.tv_sec);
#endif
offset = worker->thread_num + 1;
stat_total = worker->daemon->shm_info->ptr_arr;
stat_info = worker->daemon->shm_info->ptr_arr + offset;
/* Copy data to the current position */
server_stats_compile(worker, stat_info, 0);
/* First thread, zero fill total, and copy general info */
if (worker->thread_num == 0) {
/* Copy data to the current position */
memset(stat_total, 0, sizeof(struct ub_stats_info));
/* Point to data into SHM */
#ifndef S_SPLINT_S
shm_stat = worker->daemon->shm_info->ptr_ctl;
shm_stat->time.now_sec = (long long)worker->env.now_tv->tv_sec;
shm_stat->time.now_usec = (long long)worker->env.now_tv->tv_usec;
#endif
stat_timeval_subtract(&shm_stat->time.up_sec, &shm_stat->time.up_usec, worker->env.now_tv, &worker->daemon->time_boot);
stat_timeval_subtract(&shm_stat->time.elapsed_sec, &shm_stat->time.elapsed_usec, worker->env.now_tv, &worker->daemon->time_last_stat);
shm_stat->mem.msg = (long long)slabhash_get_mem(worker->env.msg_cache);
shm_stat->mem.rrset = (long long)slabhash_get_mem(&worker->env.rrset_cache->table);
shm_stat->mem.dnscrypt_shared_secret = 0;
#ifdef USE_DNSCRYPT
if(worker->daemon->dnscenv) {
shm_stat->mem.dnscrypt_shared_secret = (long long)slabhash_get_mem(
worker->daemon->dnscenv->shared_secrets_cache);
shm_stat->mem.dnscrypt_nonce = (long long)slabhash_get_mem(
worker->daemon->dnscenv->nonces_cache);
}
#endif
shm_stat->mem.val = (long long)mod_get_mem(&worker->env,
"validator");
shm_stat->mem.iter = (long long)mod_get_mem(&worker->env,
"iterator");
shm_stat->mem.respip = (long long)mod_get_mem(&worker->env,
"respip");
/* subnet mem value is available in shm, also when not enabled,
* to make the struct easier to memmap by other applications,
* independent of the configuration of unbound */
shm_stat->mem.subnet = 0;
#ifdef CLIENT_SUBNET
shm_stat->mem.subnet = (long long)mod_get_mem(&worker->env,
"subnet");
#endif
/* ipsecmod mem value is available in shm, also when not enabled,
* to make the struct easier to memmap by other applications,
* independent of the configuration of unbound */
shm_stat->mem.ipsecmod = 0;
#ifdef USE_IPSECMOD
shm_stat->mem.ipsecmod = (long long)mod_get_mem(&worker->env,
"ipsecmod");
#endif
#ifdef WITH_DYNLIBMODULE
shm_stat->mem.dynlib = (long long)mod_get_mem(&worker->env,
"dynlib");
#endif
}
server_stats_add(stat_total, stat_info);
/* print the thread statistics */
stat_total->mesh_time_median /= (double)worker->daemon->num;
#else
(void)worker;
#endif /* HAVE_SHMGET */
}
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