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 if (res->hr_sourceaddr[0] != '\0') 238 nv_add_string(nvout, res->hr_sourceaddr, "sourceaddr%u", no); 239 switch (res->hr_replication) { 240 case HAST_REPLICATION_FULLSYNC: 241 nv_add_string(nvout, "fullsync", "replication%u", no); 242 break; 243 case HAST_REPLICATION_MEMSYNC: 244 nv_add_string(nvout, "memsync", "replication%u", no); 245 break; 246 case HAST_REPLICATION_ASYNC: 247 nv_add_string(nvout, "async", "replication%u", no); 248 break; 249 default: 250 nv_add_string(nvout, "unknown", "replication%u", no); 251 break; 252 } 253 nv_add_string(nvout, checksum_name(res->hr_checksum), 254 "checksum%u", no); 255 nv_add_string(nvout, compression_name(res->hr_compression), 256 "compression%u", no); 257 nv_add_string(nvout, role2str(res->hr_role), "role%u", no); 258 259 switch (res->hr_role) { 260 case HAST_ROLE_PRIMARY: 261 assert(res->hr_workerpid != 0); 262 /* FALLTHROUGH */ 263 case HAST_ROLE_SECONDARY: 264 if (res->hr_workerpid != 0) 265 break; 266 /* FALLTHROUGH */ 267 default: 268 return; 269 } 270 271 /* 272 * If we are here, it means that we have a worker process, which we 273 * want to ask some questions. 274 */ 275 control_status_worker(res, nvout, no); 276 } 277 278 void 279 control_handle(struct hastd_config *cfg) 280 { 281 struct proto_conn *conn; 282 struct nv *nvin, *nvout; 283 unsigned int ii; 284 const char *str; 285 uint8_t cmd, role; 286 int error; 287 288 if (proto_accept(cfg->hc_controlconn, &conn) < 0) { 289 pjdlog_errno(LOG_ERR, "Unable to accept control connection"); 290 return; 291 } 292 293 cfg->hc_controlin = conn; 294 nvin = nvout = NULL; 295 role = HAST_ROLE_UNDEF; 296 297 if (hast_proto_recv_hdr(conn, &nvin) < 0) { 298 pjdlog_errno(LOG_ERR, "Unable to receive control header"); 299 nvin = NULL; 300 goto close; 301 } 302 303 /* Obtain command code. 0 means that nv_get_uint8() failed. */ 304 cmd = nv_get_uint8(nvin, "cmd"); 305 if (cmd == 0) { 306 pjdlog_error("Control header is missing 'cmd' field."); 307 error = EHAST_INVALID; 308 goto close; 309 } 310 311 /* Allocate outgoing nv structure. */ 312 nvout = nv_alloc(); 313 if (nvout == NULL) { 314 pjdlog_error("Unable to allocate header for control response."); 315 error = EHAST_NOMEMORY; 316 goto close; 317 } 318 319 error = 0; 320 321 str = nv_get_string(nvin, "resource0"); 322 if (str == NULL) { 323 pjdlog_error("Control header is missing 'resource0' field."); 324 error = EHAST_INVALID; 325 goto fail; 326 } 327 if (cmd == HASTCTL_SET_ROLE) { 328 role = nv_get_uint8(nvin, "role"); 329 switch (role) { 330 case HAST_ROLE_INIT: /* Is that valid to set, hmm? */ 331 case HAST_ROLE_PRIMARY: 332 case HAST_ROLE_SECONDARY: 333 break; 334 default: 335 pjdlog_error("Invalid role received (%hhu).", role); 336 error = EHAST_INVALID; 337 goto fail; 338 } 339 } 340 if (strcmp(str, "all") == 0) { 341 struct hast_resource *res; 342 343 /* All configured resources. */ 344 345 ii = 0; 346 TAILQ_FOREACH(res, &cfg->hc_resources, hr_next) { 347 switch (cmd) { 348 case HASTCTL_SET_ROLE: 349 control_set_role_common(cfg, nvout, role, res, 350 res->hr_name, ii++); 351 break; 352 case HASTCTL_STATUS: 353 control_status(cfg, nvout, res, res->hr_name, 354 ii++); 355 break; 356 default: 357 pjdlog_error("Invalid command received (%hhu).", 358 cmd); 359 error = EHAST_UNIMPLEMENTED; 360 goto fail; 361 } 362 } 363 } else { 364 /* Only selected resources. */ 365 366 for (ii = 0; ; ii++) { 367 str = nv_get_string(nvin, "resource%u", ii); 368 if (str == NULL) 369 break; 370 switch (cmd) { 371 case HASTCTL_SET_ROLE: 372 control_set_role_common(cfg, nvout, role, NULL, 373 str, ii); 374 break; 375 case HASTCTL_STATUS: 376 control_status(cfg, nvout, NULL, str, ii); 377 break; 378 default: 379 pjdlog_error("Invalid command received (%hhu).", 380 cmd); 381 error = EHAST_UNIMPLEMENTED; 382 goto fail; 383 } 384 } 385 } 386 if (nv_error(nvout) != 0) 387 goto close; 388 fail: 389 if (error != 0) 390 nv_add_int16(nvout, error, "error"); 391 392 if (hast_proto_send(NULL, conn, nvout, NULL, 0) < 0) 393 pjdlog_errno(LOG_ERR, "Unable to send control response"); 394 close: 395 if (nvin != NULL) 396 nv_free(nvin); 397 if (nvout != NULL) 398 nv_free(nvout); 399 proto_close(conn); 400 cfg->hc_controlin = NULL; 401 } 402 403 /* 404 * Thread handles control requests from the parent. 405 */ 406 void * 407 ctrl_thread(void *arg) 408 { 409 struct hast_resource *res = arg; 410 struct nv *nvin, *nvout; 411 uint8_t cmd; 412 413 for (;;) { 414 if (hast_proto_recv_hdr(res->hr_ctrl, &nvin) < 0) { 415 if (sigexit_received) 416 pthread_exit(NULL); 417 pjdlog_errno(LOG_ERR, 418 "Unable to receive control message"); 419 kill(getpid(), SIGTERM); 420 pthread_exit(NULL); 421 } 422 cmd = nv_get_uint8(nvin, "cmd"); 423 if (cmd == 0) { 424 pjdlog_error("Control message is missing 'cmd' field."); 425 nv_free(nvin); 426 continue; 427 } 428 nvout = nv_alloc(); 429 switch (cmd) { 430 case HASTCTL_STATUS: 431 if (res->hr_remotein != NULL && 432 res->hr_remoteout != NULL) { 433 nv_add_string(nvout, "complete", "status"); 434 } else { 435 nv_add_string(nvout, "degraded", "status"); 436 } 437 nv_add_uint32(nvout, (uint32_t)res->hr_extentsize, 438 "extentsize"); 439 if (res->hr_role == HAST_ROLE_PRIMARY) { 440 nv_add_uint32(nvout, 441 (uint32_t)res->hr_keepdirty, "keepdirty"); 442 nv_add_uint64(nvout, 443 (uint64_t)(activemap_ndirty(res->hr_amp) * 444 res->hr_extentsize), "dirty"); 445 } else { 446 nv_add_uint32(nvout, (uint32_t)0, "keepdirty"); 447 nv_add_uint64(nvout, (uint64_t)0, "dirty"); 448 } 449 nv_add_int16(nvout, 0, "error"); 450 break; 451 case HASTCTL_RELOAD: 452 /* 453 * When parent receives SIGHUP and discovers that 454 * something related to us has changes, it sends reload 455 * message to us. 456 */ 457 assert(res->hr_role == HAST_ROLE_PRIMARY); 458 primary_config_reload(res, nvin); 459 nv_add_int16(nvout, 0, "error"); 460 break; 461 default: 462 nv_add_int16(nvout, EINVAL, "error"); 463 break; 464 } 465 nv_free(nvin); 466 if (nv_error(nvout) != 0) { 467 pjdlog_error("Unable to create answer on control message."); 468 nv_free(nvout); 469 continue; 470 } 471 if (hast_proto_send(NULL, res->hr_ctrl, nvout, NULL, 0) < 0) { 472 pjdlog_errno(LOG_ERR, 473 "Unable to send reply to control message"); 474 } 475 nv_free(nvout); 476 } 477 /* NOTREACHED */ 478 return (NULL); 479 } 480