1 /*- 2 * Copyright (c) 2009-2010 The FreeBSD Foundation 3 * All rights reserved. 4 * 5 * This software was developed by Pawel Jakub Dawidek under sponsorship from 6 * the FreeBSD Foundation. 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 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 */ 29 30 #include <sys/cdefs.h> 31 __FBSDID("$FreeBSD$"); 32 33 #include <sys/types.h> 34 #include <sys/wait.h> 35 36 #include <assert.h> 37 #include <errno.h> 38 #include <pthread.h> 39 #include <signal.h> 40 #include <stdio.h> 41 #include <string.h> 42 #include <unistd.h> 43 44 #include "hast.h" 45 #include "hastd.h" 46 #include "hast_checksum.h" 47 #include "hast_compression.h" 48 #include "hast_proto.h" 49 #include "hooks.h" 50 #include "nv.h" 51 #include "pjdlog.h" 52 #include "proto.h" 53 #include "subr.h" 54 55 #include "control.h" 56 57 void 58 child_cleanup(struct hast_resource *res) 59 { 60 61 proto_close(res->hr_ctrl); 62 res->hr_ctrl = NULL; 63 if (res->hr_event != NULL) { 64 proto_close(res->hr_event); 65 res->hr_event = NULL; 66 } 67 if (res->hr_conn != NULL) { 68 proto_close(res->hr_conn); 69 res->hr_conn = NULL; 70 } 71 res->hr_workerpid = 0; 72 } 73 74 static void 75 control_set_role_common(struct hastd_config *cfg, struct nv *nvout, 76 uint8_t role, struct hast_resource *res, const char *name, unsigned int no) 77 { 78 int oldrole; 79 80 /* Name is always needed. */ 81 if (name != NULL) 82 nv_add_string(nvout, name, "resource%u", no); 83 84 if (res == NULL) { 85 assert(cfg != NULL); 86 assert(name != NULL); 87 88 TAILQ_FOREACH(res, &cfg->hc_resources, hr_next) { 89 if (strcmp(res->hr_name, name) == 0) 90 break; 91 } 92 if (res == NULL) { 93 nv_add_int16(nvout, EHAST_NOENTRY, "error%u", no); 94 return; 95 } 96 } 97 assert(res != NULL); 98 99 /* Send previous role back. */ 100 nv_add_string(nvout, role2str(res->hr_role), "role%u", no); 101 102 /* Nothing changed, return here. */ 103 if (role == res->hr_role) 104 return; 105 106 pjdlog_prefix_set("[%s] (%s) ", res->hr_name, role2str(res->hr_role)); 107 pjdlog_info("Role changed to %s.", role2str(role)); 108 109 /* Change role to the new one. */ 110 oldrole = res->hr_role; 111 res->hr_role = role; 112 pjdlog_prefix_set("[%s] (%s) ", res->hr_name, role2str(res->hr_role)); 113 114 /* 115 * If previous role was primary or secondary we have to kill process 116 * doing that work. 117 */ 118 if (res->hr_workerpid != 0) { 119 if (kill(res->hr_workerpid, SIGTERM) < 0) { 120 pjdlog_errno(LOG_WARNING, 121 "Unable to kill worker process %u", 122 (unsigned int)res->hr_workerpid); 123 } else if (waitpid(res->hr_workerpid, NULL, 0) != 124 res->hr_workerpid) { 125 pjdlog_errno(LOG_WARNING, 126 "Error while waiting for worker process %u", 127 (unsigned int)res->hr_workerpid); 128 } else { 129 pjdlog_debug(1, "Worker process %u stopped.", 130 (unsigned int)res->hr_workerpid); 131 } 132 child_cleanup(res); 133 } 134 135 /* Start worker process if we are changing to primary. */ 136 if (role == HAST_ROLE_PRIMARY) 137 hastd_primary(res); 138 pjdlog_prefix_set("%s", ""); 139 hook_exec(res->hr_exec, "role", res->hr_name, role2str(oldrole), 140 role2str(res->hr_role), NULL); 141 } 142 143 void 144 control_set_role(struct hast_resource *res, uint8_t role) 145 { 146 147 control_set_role_common(NULL, NULL, role, res, NULL, 0); 148 } 149 150 static void 151 control_status_worker(struct hast_resource *res, struct nv *nvout, 152 unsigned int no) 153 { 154 struct nv *cnvin, *cnvout; 155 const char *str; 156 int error; 157 158 cnvin = cnvout = NULL; 159 error = 0; 160 161 /* 162 * Prepare and send command to worker process. 163 */ 164 cnvout = nv_alloc(); 165 nv_add_uint8(cnvout, HASTCTL_STATUS, "cmd"); 166 error = nv_error(cnvout); 167 if (error != 0) { 168 pjdlog_common(LOG_ERR, 0, error, 169 "Unable to prepare control header"); 170 goto end; 171 } 172 if (hast_proto_send(res, res->hr_ctrl, cnvout, NULL, 0) < 0) { 173 error = errno; 174 pjdlog_errno(LOG_ERR, "Unable to send control header"); 175 goto end; 176 } 177 178 /* 179 * Receive response. 180 */ 181 if (hast_proto_recv_hdr(res->hr_ctrl, &cnvin) < 0) { 182 error = errno; 183 pjdlog_errno(LOG_ERR, "Unable to receive control header"); 184 goto end; 185 } 186 187 error = nv_get_int16(cnvin, "error"); 188 if (error != 0) 189 goto end; 190 191 if ((str = nv_get_string(cnvin, "status")) == NULL) { 192 error = ENOENT; 193 pjdlog_errno(LOG_ERR, "Field 'status' is missing."); 194 goto end; 195 } 196 nv_add_string(nvout, str, "status%u", no); 197 nv_add_uint64(nvout, nv_get_uint64(cnvin, "dirty"), "dirty%u", no); 198 nv_add_uint32(nvout, nv_get_uint32(cnvin, "extentsize"), 199 "extentsize%u", no); 200 nv_add_uint32(nvout, nv_get_uint32(cnvin, "keepdirty"), 201 "keepdirty%u", no); 202 end: 203 if (cnvin != NULL) 204 nv_free(cnvin); 205 if (cnvout != NULL) 206 nv_free(cnvout); 207 if (error != 0) 208 nv_add_int16(nvout, error, "error"); 209 } 210 211 static void 212 control_status(struct hastd_config *cfg, struct nv *nvout, 213 struct hast_resource *res, const char *name, unsigned int no) 214 { 215 216 assert(cfg != NULL); 217 assert(nvout != NULL); 218 assert(name != NULL); 219 220 /* Name is always needed. */ 221 nv_add_string(nvout, name, "resource%u", no); 222 223 if (res == NULL) { 224 TAILQ_FOREACH(res, &cfg->hc_resources, hr_next) { 225 if (strcmp(res->hr_name, name) == 0) 226 break; 227 } 228 if (res == NULL) { 229 nv_add_int16(nvout, EHAST_NOENTRY, "error%u", no); 230 return; 231 } 232 } 233 assert(res != NULL); 234 nv_add_string(nvout, res->hr_provname, "provname%u", no); 235 nv_add_string(nvout, res->hr_localpath, "localpath%u", no); 236 nv_add_string(nvout, res->hr_remoteaddr, "remoteaddr%u", no); 237 switch (res->hr_replication) { 238 case HAST_REPLICATION_FULLSYNC: 239 nv_add_string(nvout, "fullsync", "replication%u", no); 240 break; 241 case HAST_REPLICATION_MEMSYNC: 242 nv_add_string(nvout, "memsync", "replication%u", no); 243 break; 244 case HAST_REPLICATION_ASYNC: 245 nv_add_string(nvout, "async", "replication%u", no); 246 break; 247 default: 248 nv_add_string(nvout, "unknown", "replication%u", no); 249 break; 250 } 251 nv_add_string(nvout, checksum_name(res->hr_checksum), 252 "checksum%u", no); 253 nv_add_string(nvout, compression_name(res->hr_compression), 254 "compression%u", no); 255 nv_add_string(nvout, role2str(res->hr_role), "role%u", no); 256 257 switch (res->hr_role) { 258 case HAST_ROLE_PRIMARY: 259 assert(res->hr_workerpid != 0); 260 /* FALLTHROUGH */ 261 case HAST_ROLE_SECONDARY: 262 if (res->hr_workerpid != 0) 263 break; 264 /* FALLTHROUGH */ 265 default: 266 return; 267 } 268 269 /* 270 * If we are here, it means that we have a worker process, which we 271 * want to ask some questions. 272 */ 273 control_status_worker(res, nvout, no); 274 } 275 276 void 277 control_handle(struct hastd_config *cfg) 278 { 279 struct proto_conn *conn; 280 struct nv *nvin, *nvout; 281 unsigned int ii; 282 const char *str; 283 uint8_t cmd, role; 284 int error; 285 286 if (proto_accept(cfg->hc_controlconn, &conn) < 0) { 287 pjdlog_errno(LOG_ERR, "Unable to accept control connection"); 288 return; 289 } 290 291 cfg->hc_controlin = conn; 292 nvin = nvout = NULL; 293 role = HAST_ROLE_UNDEF; 294 295 if (hast_proto_recv_hdr(conn, &nvin) < 0) { 296 pjdlog_errno(LOG_ERR, "Unable to receive control header"); 297 nvin = NULL; 298 goto close; 299 } 300 301 /* Obtain command code. 0 means that nv_get_uint8() failed. */ 302 cmd = nv_get_uint8(nvin, "cmd"); 303 if (cmd == 0) { 304 pjdlog_error("Control header is missing 'cmd' field."); 305 error = EHAST_INVALID; 306 goto close; 307 } 308 309 /* Allocate outgoing nv structure. */ 310 nvout = nv_alloc(); 311 if (nvout == NULL) { 312 pjdlog_error("Unable to allocate header for control response."); 313 error = EHAST_NOMEMORY; 314 goto close; 315 } 316 317 error = 0; 318 319 str = nv_get_string(nvin, "resource0"); 320 if (str == NULL) { 321 pjdlog_error("Control header is missing 'resource0' field."); 322 error = EHAST_INVALID; 323 goto fail; 324 } 325 if (cmd == HASTCTL_SET_ROLE) { 326 role = nv_get_uint8(nvin, "role"); 327 switch (role) { 328 case HAST_ROLE_INIT: /* Is that valid to set, hmm? */ 329 case HAST_ROLE_PRIMARY: 330 case HAST_ROLE_SECONDARY: 331 break; 332 default: 333 pjdlog_error("Invalid role received (%hhu).", role); 334 error = EHAST_INVALID; 335 goto fail; 336 } 337 } 338 if (strcmp(str, "all") == 0) { 339 struct hast_resource *res; 340 341 /* All configured resources. */ 342 343 ii = 0; 344 TAILQ_FOREACH(res, &cfg->hc_resources, hr_next) { 345 switch (cmd) { 346 case HASTCTL_SET_ROLE: 347 control_set_role_common(cfg, nvout, role, res, 348 res->hr_name, ii++); 349 break; 350 case HASTCTL_STATUS: 351 control_status(cfg, nvout, res, res->hr_name, 352 ii++); 353 break; 354 default: 355 pjdlog_error("Invalid command received (%hhu).", 356 cmd); 357 error = EHAST_UNIMPLEMENTED; 358 goto fail; 359 } 360 } 361 } else { 362 /* Only selected resources. */ 363 364 for (ii = 0; ; ii++) { 365 str = nv_get_string(nvin, "resource%u", ii); 366 if (str == NULL) 367 break; 368 switch (cmd) { 369 case HASTCTL_SET_ROLE: 370 control_set_role_common(cfg, nvout, role, NULL, 371 str, ii); 372 break; 373 case HASTCTL_STATUS: 374 control_status(cfg, nvout, NULL, str, ii); 375 break; 376 default: 377 pjdlog_error("Invalid command received (%hhu).", 378 cmd); 379 error = EHAST_UNIMPLEMENTED; 380 goto fail; 381 } 382 } 383 } 384 if (nv_error(nvout) != 0) 385 goto close; 386 fail: 387 if (error != 0) 388 nv_add_int16(nvout, error, "error"); 389 390 if (hast_proto_send(NULL, conn, nvout, NULL, 0) < 0) 391 pjdlog_errno(LOG_ERR, "Unable to send control response"); 392 close: 393 if (nvin != NULL) 394 nv_free(nvin); 395 if (nvout != NULL) 396 nv_free(nvout); 397 proto_close(conn); 398 cfg->hc_controlin = NULL; 399 } 400 401 /* 402 * Thread handles control requests from the parent. 403 */ 404 void * 405 ctrl_thread(void *arg) 406 { 407 struct hast_resource *res = arg; 408 struct nv *nvin, *nvout; 409 uint8_t cmd; 410 411 for (;;) { 412 if (hast_proto_recv_hdr(res->hr_ctrl, &nvin) < 0) { 413 if (sigexit_received) 414 pthread_exit(NULL); 415 pjdlog_errno(LOG_ERR, 416 "Unable to receive control message"); 417 kill(getpid(), SIGTERM); 418 pthread_exit(NULL); 419 } 420 cmd = nv_get_uint8(nvin, "cmd"); 421 if (cmd == 0) { 422 pjdlog_error("Control message is missing 'cmd' field."); 423 nv_free(nvin); 424 continue; 425 } 426 nvout = nv_alloc(); 427 switch (cmd) { 428 case HASTCTL_STATUS: 429 if (res->hr_remotein != NULL && 430 res->hr_remoteout != NULL) { 431 nv_add_string(nvout, "complete", "status"); 432 } else { 433 nv_add_string(nvout, "degraded", "status"); 434 } 435 nv_add_uint32(nvout, (uint32_t)res->hr_extentsize, 436 "extentsize"); 437 if (res->hr_role == HAST_ROLE_PRIMARY) { 438 nv_add_uint32(nvout, 439 (uint32_t)res->hr_keepdirty, "keepdirty"); 440 nv_add_uint64(nvout, 441 (uint64_t)(activemap_ndirty(res->hr_amp) * 442 res->hr_extentsize), "dirty"); 443 } else { 444 nv_add_uint32(nvout, (uint32_t)0, "keepdirty"); 445 nv_add_uint64(nvout, (uint64_t)0, "dirty"); 446 } 447 nv_add_int16(nvout, 0, "error"); 448 break; 449 case HASTCTL_RELOAD: 450 /* 451 * When parent receives SIGHUP and discovers that 452 * something related to us has changes, it sends reload 453 * message to us. 454 */ 455 assert(res->hr_role == HAST_ROLE_PRIMARY); 456 primary_config_reload(res, nvin); 457 nv_add_int16(nvout, 0, "error"); 458 break; 459 default: 460 nv_add_int16(nvout, EINVAL, "error"); 461 break; 462 } 463 nv_free(nvin); 464 if (nv_error(nvout) != 0) { 465 pjdlog_error("Unable to create answer on control message."); 466 nv_free(nvout); 467 continue; 468 } 469 if (hast_proto_send(NULL, res->hr_ctrl, nvout, NULL, 0) < 0) { 470 pjdlog_errno(LOG_ERR, 471 "Unable to send reply to control message"); 472 } 473 nv_free(nvout); 474 } 475 /* NOTREACHED */ 476 return (NULL); 477 } 478