shm_main.c revision 356345
1/* 2 * util/shm_side/shm_main.c - SHM for statistics transport 3 * 4 * Copyright (c) 2017, NLnet Labs. All rights reserved. 5 * 6 * This software is open source. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 12 * Redistributions of source code must retain the above copyright notice, 13 * this list of conditions and the following disclaimer. 14 * 15 * Redistributions in binary form must reproduce the above copyright notice, 16 * this list of conditions and the following disclaimer in the documentation 17 * and/or other materials provided with the distribution. 18 * 19 * Neither the name of the NLNET LABS nor the names of its contributors may 20 * be used to endorse or promote products derived from this software without 21 * specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 24 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 25 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 26 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 27 * HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 28 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED 29 * TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR 30 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF 31 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING 32 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS 33 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 34 */ 35 36/** 37 * \file 38 * 39 * This file contains functions for the SHM implementation. 40 */ 41 42#include "config.h" 43#include <ctype.h> 44#include <stdarg.h> 45#ifdef HAVE_SYS_IPC_H 46#include <sys/ipc.h> 47#endif 48#ifdef HAVE_SYS_SHM_H 49#include <sys/shm.h> 50#endif 51#include <sys/time.h> 52#include <errno.h> 53#include "shm_main.h" 54#include "daemon/daemon.h" 55#include "daemon/worker.h" 56#include "daemon/stats.h" 57#include "services/mesh.h" 58#include "services/cache/rrset.h" 59#include "services/cache/infra.h" 60#include "validator/validator.h" 61#include "util/config_file.h" 62#include "util/fptr_wlist.h" 63#include "util/log.h" 64 65#ifdef HAVE_SHMGET 66/** subtract timers and the values do not overflow or become negative */ 67static void 68stat_timeval_subtract(long long *d_sec, long long *d_usec, const struct timeval* end, 69 const struct timeval* start) 70{ 71#ifndef S_SPLINT_S 72 time_t end_usec = end->tv_usec; 73 *d_sec = end->tv_sec - start->tv_sec; 74 if(end_usec < start->tv_usec) { 75 end_usec += 1000000; 76 (*d_sec)--; 77 } 78 *d_usec = end_usec - start->tv_usec; 79#endif 80} 81#endif /* HAVE_SHMGET */ 82 83int shm_main_init(struct daemon* daemon) 84{ 85#ifdef HAVE_SHMGET 86 struct ub_shm_stat_info *shm_stat; 87 size_t shm_size; 88 89 /* sanitize */ 90 if(!daemon) 91 return 0; 92 if(!daemon->cfg->shm_enable) 93 return 1; 94 if(daemon->cfg->stat_interval == 0) 95 log_warn("shm-enable is yes but statistics-interval is 0"); 96 97 /* Statistics to maintain the number of thread + total */ 98 shm_size = (sizeof(struct ub_stats_info) * (daemon->num + 1)); 99 100 /* Allocation of needed memory */ 101 daemon->shm_info = (struct shm_main_info*)calloc(1, shm_size); 102 103 /* Sanitize */ 104 if(!daemon->shm_info) { 105 log_err("shm fail: malloc failure"); 106 return 0; 107 } 108 109 daemon->shm_info->key = daemon->cfg->shm_key; 110 111 /* Check for previous create SHM */ 112 daemon->shm_info->id_ctl = shmget(daemon->shm_info->key, sizeof(int), SHM_R); 113 daemon->shm_info->id_arr = shmget(daemon->shm_info->key + 1, sizeof(int), SHM_R); 114 115 /* Destroy previous SHM */ 116 if (daemon->shm_info->id_ctl >= 0) 117 shmctl(daemon->shm_info->id_ctl, IPC_RMID, NULL); 118 119 /* Destroy previous SHM */ 120 if (daemon->shm_info->id_arr >= 0) 121 shmctl(daemon->shm_info->id_arr, IPC_RMID, NULL); 122 123 /* SHM: Create the segment */ 124 daemon->shm_info->id_ctl = shmget(daemon->shm_info->key, sizeof(struct ub_shm_stat_info), IPC_CREAT | 0644); 125 126 if (daemon->shm_info->id_ctl < 0) 127 { 128 log_err("SHM failed(id_ctl) cannot shmget(key %d) %s", 129 daemon->shm_info->key, strerror(errno)); 130 131 /* Just release memory unused */ 132 free(daemon->shm_info); 133 134 return 0; 135 } 136 137 daemon->shm_info->id_arr = shmget(daemon->shm_info->key + 1, shm_size, IPC_CREAT | 0644); 138 139 if (daemon->shm_info->id_arr < 0) 140 { 141 log_err("SHM failed(id_arr) cannot shmget(key %d + 1) %s", 142 daemon->shm_info->key, strerror(errno)); 143 144 /* Just release memory unused */ 145 free(daemon->shm_info); 146 147 return 0; 148 } 149 150 /* SHM: attach the segment */ 151 daemon->shm_info->ptr_ctl = (struct ub_shm_stat_info*) 152 shmat(daemon->shm_info->id_ctl, NULL, 0); 153 if(daemon->shm_info->ptr_ctl == (void *) -1) { 154 log_err("SHM failed(ctl) cannot shmat(%d) %s", 155 daemon->shm_info->id_ctl, strerror(errno)); 156 157 /* Just release memory unused */ 158 free(daemon->shm_info); 159 160 return 0; 161 } 162 163 daemon->shm_info->ptr_arr = (struct ub_stats_info*) 164 shmat(daemon->shm_info->id_arr, NULL, 0); 165 166 if (daemon->shm_info->ptr_arr == (void *) -1) 167 { 168 log_err("SHM failed(arr) cannot shmat(%d) %s", 169 daemon->shm_info->id_arr, strerror(errno)); 170 171 /* Just release memory unused */ 172 free(daemon->shm_info); 173 174 return 0; 175 } 176 177 /* Zero fill SHM to stand clean while is not filled by other events */ 178 memset(daemon->shm_info->ptr_ctl, 0, sizeof(struct ub_shm_stat_info)); 179 memset(daemon->shm_info->ptr_arr, 0, shm_size); 180 181 shm_stat = daemon->shm_info->ptr_ctl; 182 shm_stat->num_threads = daemon->num; 183 184#else 185 (void)daemon; 186#endif /* HAVE_SHMGET */ 187 return 1; 188} 189 190void shm_main_shutdown(struct daemon* daemon) 191{ 192#ifdef HAVE_SHMGET 193 /* web are OK, just disabled */ 194 if(!daemon->cfg->shm_enable) 195 return; 196 197 verbose(VERB_DETAIL, "SHM shutdown - KEY [%d] - ID CTL [%d] ARR [%d] - PTR CTL [%p] ARR [%p]", 198 daemon->shm_info->key, daemon->shm_info->id_ctl, daemon->shm_info->id_arr, daemon->shm_info->ptr_ctl, daemon->shm_info->ptr_arr); 199 200 /* Destroy previous SHM */ 201 if (daemon->shm_info->id_ctl >= 0) 202 shmctl(daemon->shm_info->id_ctl, IPC_RMID, NULL); 203 204 if (daemon->shm_info->id_arr >= 0) 205 shmctl(daemon->shm_info->id_arr, IPC_RMID, NULL); 206 207 if (daemon->shm_info->ptr_ctl) 208 shmdt(daemon->shm_info->ptr_ctl); 209 210 if (daemon->shm_info->ptr_arr) 211 shmdt(daemon->shm_info->ptr_arr); 212 213#else 214 (void)daemon; 215#endif /* HAVE_SHMGET */ 216} 217 218void shm_main_run(struct worker *worker) 219{ 220#ifdef HAVE_SHMGET 221 struct ub_shm_stat_info *shm_stat; 222 struct ub_stats_info *stat_total; 223 struct ub_stats_info *stat_info; 224 int offset; 225 226#ifndef S_SPLINT_S 227 verbose(VERB_DETAIL, "SHM run - worker [%d] - daemon [%p] - timenow(%u) - timeboot(%u)", 228 worker->thread_num, worker->daemon, (unsigned)worker->env.now_tv->tv_sec, (unsigned)worker->daemon->time_boot.tv_sec); 229#endif 230 231 offset = worker->thread_num + 1; 232 stat_total = worker->daemon->shm_info->ptr_arr; 233 stat_info = worker->daemon->shm_info->ptr_arr + offset; 234 235 /* Copy data to the current position */ 236 server_stats_compile(worker, stat_info, 0); 237 238 /* First thread, zero fill total, and copy general info */ 239 if (worker->thread_num == 0) { 240 241 /* Copy data to the current position */ 242 memset(stat_total, 0, sizeof(struct ub_stats_info)); 243 244 /* Point to data into SHM */ 245#ifndef S_SPLINT_S 246 shm_stat = worker->daemon->shm_info->ptr_ctl; 247 shm_stat->time.now_sec = (long long)worker->env.now_tv->tv_sec; 248 shm_stat->time.now_usec = (long long)worker->env.now_tv->tv_usec; 249#endif 250 251 stat_timeval_subtract(&shm_stat->time.up_sec, &shm_stat->time.up_usec, worker->env.now_tv, &worker->daemon->time_boot); 252 stat_timeval_subtract(&shm_stat->time.elapsed_sec, &shm_stat->time.elapsed_usec, worker->env.now_tv, &worker->daemon->time_last_stat); 253 254 shm_stat->mem.msg = (long long)slabhash_get_mem(worker->env.msg_cache); 255 shm_stat->mem.rrset = (long long)slabhash_get_mem(&worker->env.rrset_cache->table); 256 shm_stat->mem.dnscrypt_shared_secret = 0; 257#ifdef USE_DNSCRYPT 258 if(worker->daemon->dnscenv) { 259 shm_stat->mem.dnscrypt_shared_secret = (long long)slabhash_get_mem( 260 worker->daemon->dnscenv->shared_secrets_cache); 261 shm_stat->mem.dnscrypt_nonce = (long long)slabhash_get_mem( 262 worker->daemon->dnscenv->nonces_cache); 263 } 264#endif 265 shm_stat->mem.val = (long long)mod_get_mem(&worker->env, 266 "validator"); 267 shm_stat->mem.iter = (long long)mod_get_mem(&worker->env, 268 "iterator"); 269 shm_stat->mem.respip = (long long)mod_get_mem(&worker->env, 270 "respip"); 271 272 /* subnet mem value is available in shm, also when not enabled, 273 * to make the struct easier to memmap by other applications, 274 * independent of the configuration of unbound */ 275 shm_stat->mem.subnet = 0; 276#ifdef CLIENT_SUBNET 277 shm_stat->mem.subnet = (long long)mod_get_mem(&worker->env, 278 "subnet"); 279#endif 280 /* ipsecmod mem value is available in shm, also when not enabled, 281 * to make the struct easier to memmap by other applications, 282 * independent of the configuration of unbound */ 283 shm_stat->mem.ipsecmod = 0; 284#ifdef USE_IPSECMOD 285 shm_stat->mem.ipsecmod = (long long)mod_get_mem(&worker->env, 286 "ipsecmod"); 287#endif 288 } 289 290 server_stats_add(stat_total, stat_info); 291 292 /* print the thread statistics */ 293 stat_total->mesh_time_median /= (double)worker->daemon->num; 294 295#else 296 (void)worker; 297#endif /* HAVE_SHMGET */ 298} 299