usr.sbin/ctld/ctld.c

   1 /*-
   2  * Copyright (c) 2012 The FreeBSD Foundation
   3  * All rights reserved.
   4  *
   5  * This software was developed by Edward Tomasz Napierala under sponsorship
   6  * from 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 AUTHOR 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 AUTHOR 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  * $FreeBSD$
  30  */
  31
  32 #include <sys/types.h>
  33 #include <sys/time.h>
  34 #include <sys/socket.h>
  35 #include <sys/wait.h>
  36 #include <netinet/in.h>
  37 #include <assert.h>
  38 #include <ctype.h>
  39 #include <errno.h>
  40 #include <netdb.h>
  41 #include <signal.h>
  42 #include <stdbool.h>
  43 #include <stdio.h>
  44 #include <stdint.h>
  45 #include <stdlib.h>
  46 #include <string.h>
  47 #include <unistd.h>
  48
  49 #include "ctld.h"
  50
  51 bool proxy_mode = false;
  52
  53 static volatile bool sighup_received = false;
  54 static volatile bool sigterm_received = false;
  55 static volatile bool sigalrm_received = false;
  56
  57 static int nchildren = 0;
  58
  59 static void
  60 usage(void)
  61 {
  62
  63         fprintf(stderr, "usage: ctld [-d][-f config-file]\n");
  64         exit(1);
  65 }
  66
  67 char *
  68 checked_strdup(const char *s)
  69 {
  70         char *c;
  71
  72         c = strdup(s);
  73         if (c == NULL)
  74                 log_err(1, "strdup");
  75         return (c);
  76 }
  77
  78 struct conf *
  79 conf_new(void)
  80 {
  81         struct conf *conf;
  82
  83         conf = calloc(1, sizeof(*conf));
  84         if (conf == NULL)
  85                 log_err(1, "calloc");
  86         TAILQ_INIT(&conf->conf_targets);
  87         TAILQ_INIT(&conf->conf_auth_groups);
  88         TAILQ_INIT(&conf->conf_portal_groups);
  89
  90         conf->conf_debug = 0;
  91         conf->conf_timeout = 60;
  92         conf->conf_maxproc = 30;
  93
  94         return (conf);
  95 }
  96
  97 void
  98 conf_delete(struct conf *conf)
  99 {
 100         struct target *targ, *tmp;
 101         struct auth_group *ag, *cagtmp;
 102         struct portal_group *pg, *cpgtmp;
 103
 104         assert(conf->conf_pidfh == NULL);
 105
 106         TAILQ_FOREACH_SAFE(targ, &conf->conf_targets, t_next, tmp)
 107                 target_delete(targ);
 108         TAILQ_FOREACH_SAFE(ag, &conf->conf_auth_groups, ag_next, cagtmp)
 109                 auth_group_delete(ag);
 110         TAILQ_FOREACH_SAFE(pg, &conf->conf_portal_groups, pg_next, cpgtmp)
 111                 portal_group_delete(pg);
 112         free(conf->conf_pidfile_path);
 113         free(conf);
 114 }
 115
 116 static struct auth *
 117 auth_new(struct auth_group *ag)
 118 {
 119         struct auth *auth;
 120
 121         auth = calloc(1, sizeof(*auth));
 122         if (auth == NULL)
 123                 log_err(1, "calloc");
 124         auth->a_auth_group = ag;
 125         TAILQ_INSERT_TAIL(&ag->ag_auths, auth, a_next);
 126         return (auth);
 127 }
 128
 129 static void
 130 auth_delete(struct auth *auth)
 131 {
 132         TAILQ_REMOVE(&auth->a_auth_group->ag_auths, auth, a_next);
 133
 134         free(auth->a_user);
 135         free(auth->a_secret);
 136         free(auth->a_mutual_user);
 137         free(auth->a_mutual_secret);
 138         free(auth);
 139 }
 140
 141 const struct auth *
 142 auth_find(const struct auth_group *ag, const char *user)
 143 {
 144         const struct auth *auth;
 145
 146         TAILQ_FOREACH(auth, &ag->ag_auths, a_next) {
 147                 if (strcmp(auth->a_user, user) == 0)
 148                         return (auth);
 149         }
 150
 151         return (NULL);
 152 }
 153
 154 static void
 155 auth_check_secret_length(struct auth *auth)
 156 {
 157         size_t len;
 158
 159         len = strlen(auth->a_secret);
 160         if (len > 16) {
 161                 if (auth->a_auth_group->ag_name != NULL)
 162                         log_warnx("secret for user \"%s\", auth-group \"%s\", "
 163                             "is too long; it should be at most 16 characters "
 164                             "long", auth->a_user, auth->a_auth_group->ag_name);
 165                 else
 166                         log_warnx("secret for user \"%s\", target \"%s\", "
 167                             "is too long; it should be at most 16 characters "
 168                             "long", auth->a_user,
 169                             auth->a_auth_group->ag_target->t_name);
 170         }
 171         if (len < 12) {
 172                 if (auth->a_auth_group->ag_name != NULL)
 173                         log_warnx("secret for user \"%s\", auth-group \"%s\", "
 174                             "is too short; it should be at least 12 characters "
 175                             "long", auth->a_user,
 176                             auth->a_auth_group->ag_name);
 177                 else
 178                         log_warnx("secret for user \"%s\", target \"%s\", "
 179                             "is too short; it should be at least 16 characters "
 180                             "long", auth->a_user,
 181                             auth->a_auth_group->ag_target->t_name);
 182         }
 183
 184         if (auth->a_mutual_secret != NULL) {
 185                 len = strlen(auth->a_secret);
 186                 if (len > 16) {
 187                         if (auth->a_auth_group->ag_name != NULL)
 188                                 log_warnx("mutual secret for user \"%s\", "
 189                                     "auth-group \"%s\", is too long; it should "
 190                                     "be at most 16 characters long",
 191                                     auth->a_user, auth->a_auth_group->ag_name);
 192                         else
 193                                 log_warnx("mutual secret for user \"%s\", "
 194                                     "target \"%s\", is too long; it should "
 195                                     "be at most 16 characters long",
 196                                     auth->a_user,
 197                                     auth->a_auth_group->ag_target->t_name);
 198                 }
 199                 if (len < 12) {
 200                         if (auth->a_auth_group->ag_name != NULL)
 201                                 log_warnx("mutual secret for user \"%s\", "
 202                                     "auth-group \"%s\", is too short; it "
 203                                     "should be at least 12 characters long",
 204                                     auth->a_user, auth->a_auth_group->ag_name);
 205                         else
 206                                 log_warnx("mutual secret for user \"%s\", "
 207                                     "target \"%s\", is too short; it should be "
 208                                     "at least 16 characters long",
 209                                     auth->a_user,
 210                                     auth->a_auth_group->ag_target->t_name);
 211                 }
 212         }
 213 }
 214
 215 const struct auth *
 216 auth_new_chap(struct auth_group *ag, const char *user,
 217     const char *secret)
 218 {
 219         struct auth *auth;
 220
 221         if (ag->ag_type == AG_TYPE_UNKNOWN)
 222                 ag->ag_type = AG_TYPE_CHAP;
 223         if (ag->ag_type != AG_TYPE_CHAP) {
 224                 if (ag->ag_name != NULL)
 225                         log_warnx("cannot mix \"chap\" authentication with "
 226                             "other types for auth-group \"%s\"", ag->ag_name);
 227                 else
 228                         log_warnx("cannot mix \"chap\" authentication with "
 229                             "other types for target \"%s\"",
 230                             ag->ag_target->t_name);
 231                 return (NULL);
 232         }
 233
 234         auth = auth_new(ag);
 235         auth->a_user = checked_strdup(user);
 236         auth->a_secret = checked_strdup(secret);
 237
 238         auth_check_secret_length(auth);
 239
 240         return (auth);
 241 }
 242
 243 const struct auth *
 244 auth_new_chap_mutual(struct auth_group *ag, const char *user,
 245     const char *secret, const char *user2, const char *secret2)
 246 {
 247         struct auth *auth;
 248
 249         if (ag->ag_type == AG_TYPE_UNKNOWN)
 250                 ag->ag_type = AG_TYPE_CHAP_MUTUAL;
 251         if (ag->ag_type != AG_TYPE_CHAP_MUTUAL) {
 252                 if (ag->ag_name != NULL)
 253                         log_warnx("cannot mix \"chap-mutual\" authentication "
 254                             "with other types for auth-group \"%s\"",
 255                             ag->ag_name);
 256                 else
 257                         log_warnx("cannot mix \"chap-mutual\" authentication "
 258                             "with other types for target \"%s\"",
 259                             ag->ag_target->t_name);
 260                 return (NULL);
 261         }
 262
 263         auth = auth_new(ag);
 264         auth->a_user = checked_strdup(user);
 265         auth->a_secret = checked_strdup(secret);
 266         auth->a_mutual_user = checked_strdup(user2);
 267         auth->a_mutual_secret = checked_strdup(secret2);
 268
 269         auth_check_secret_length(auth);
 270
 271         return (auth);
 272 }
 273
 274 const struct auth_name *
 275 auth_name_new(struct auth_group *ag, const char *name)
 276 {
 277         struct auth_name *an;
 278
 279         an = calloc(1, sizeof(*an));
 280         if (an == NULL)
 281                 log_err(1, "calloc");
 282         an->an_auth_group = ag;
 283         an->an_initator_name = checked_strdup(name);
 284         TAILQ_INSERT_TAIL(&ag->ag_names, an, an_next);
 285         return (an);
 286 }
 287
 288 static void
 289 auth_name_delete(struct auth_name *an)
 290 {
 291         TAILQ_REMOVE(&an->an_auth_group->ag_names, an, an_next);
 292
 293         free(an->an_initator_name);
 294         free(an);
 295 }
 296
 297 bool
 298 auth_name_defined(const struct auth_group *ag)
 299 {
 300         if (TAILQ_EMPTY(&ag->ag_names))
 301                 return (false);
 302         return (true);
 303 }
 304
 305 const struct auth_name *
 306 auth_name_find(const struct auth_group *ag, const char *name)
 307 {
 308         const struct auth_name *auth_name;
 309
 310         TAILQ_FOREACH(auth_name, &ag->ag_names, an_next) {
 311                 if (strcmp(auth_name->an_initator_name, name) == 0)
 312                         return (auth_name);
 313         }
 314
 315         return (NULL);
 316 }
 317
 318 const struct auth_portal *
 319 auth_portal_new(struct auth_group *ag, const char *portal)
 320 {
 321         struct auth_portal *ap;
 322
 323         ap = calloc(1, sizeof(*ap));
 324         if (ap == NULL)
 325                 log_err(1, "calloc");
 326         ap->ap_auth_group = ag;
 327         ap->ap_initator_portal = checked_strdup(portal);
 328         TAILQ_INSERT_TAIL(&ag->ag_portals, ap, ap_next);
 329         return (ap);
 330 }
 331
 332 static void
 333 auth_portal_delete(struct auth_portal *ap)
 334 {
 335         TAILQ_REMOVE(&ap->ap_auth_group->ag_portals, ap, ap_next);
 336
 337         free(ap->ap_initator_portal);
 338         free(ap);
 339 }
 340
 341 bool
 342 auth_portal_defined(const struct auth_group *ag)
 343 {
 344         if (TAILQ_EMPTY(&ag->ag_portals))
 345                 return (false);
 346         return (true);
 347 }
 348
 349 const struct auth_portal *
 350 auth_portal_find(const struct auth_group *ag, const char *portal)
 351 {
 352         const struct auth_portal *auth_portal;
 353
 354         TAILQ_FOREACH(auth_portal, &ag->ag_portals, ap_next) {
 355                 if (strcmp(auth_portal->ap_initator_portal, portal) == 0)
 356                         return (auth_portal);
 357         }
 358
 359         return (NULL);
 360 }
 361
 362 struct auth_group *
 363 auth_group_new(struct conf *conf, const char *name)
 364 {
 365         struct auth_group *ag;
 366
 367         if (name != NULL) {
 368                 ag = auth_group_find(conf, name);
 369                 if (ag != NULL) {
 370                         log_warnx("duplicated auth-group \"%s\"", name);
 371                         return (NULL);
 372                 }
 373         }
 374
 375         ag = calloc(1, sizeof(*ag));
 376         if (ag == NULL)
 377                 log_err(1, "calloc");
 378         if (name != NULL)
 379                 ag->ag_name = checked_strdup(name);
 380         TAILQ_INIT(&ag->ag_auths);
 381         TAILQ_INIT(&ag->ag_names);
 382         TAILQ_INIT(&ag->ag_portals);
 383         ag->ag_conf = conf;
 384         TAILQ_INSERT_TAIL(&conf->conf_auth_groups, ag, ag_next);
 385
 386         return (ag);
 387 }
 388
 389 void
 390 auth_group_delete(struct auth_group *ag)
 391 {
 392         struct auth *auth, *auth_tmp;
 393         struct auth_name *auth_name, *auth_name_tmp;
 394         struct auth_portal *auth_portal, *auth_portal_tmp;
 395
 396         TAILQ_REMOVE(&ag->ag_conf->conf_auth_groups, ag, ag_next);
 397
 398         TAILQ_FOREACH_SAFE(auth, &ag->ag_auths, a_next, auth_tmp)
 399                 auth_delete(auth);
 400         TAILQ_FOREACH_SAFE(auth_name, &ag->ag_names, an_next, auth_name_tmp)
 401                 auth_name_delete(auth_name);
 402         TAILQ_FOREACH_SAFE(auth_portal, &ag->ag_portals, ap_next,
 403             auth_portal_tmp)
 404                 auth_portal_delete(auth_portal);
 405         free(ag->ag_name);
 406         free(ag);
 407 }
 408
 409 struct auth_group *
 410 auth_group_find(const struct conf *conf, const char *name)
 411 {
 412         struct auth_group *ag;
 413
 414         TAILQ_FOREACH(ag, &conf->conf_auth_groups, ag_next) {
 415                 if (ag->ag_name != NULL && strcmp(ag->ag_name, name) == 0)
 416                         return (ag);
 417         }
 418
 419         return (NULL);
 420 }
 421
 422 static int
 423 auth_group_set_type(struct auth_group *ag, int type)
 424 {
 425
 426         if (ag->ag_type == AG_TYPE_UNKNOWN) {
 427                 ag->ag_type = type;
 428                 return (0);
 429         }
 430
 431         if (ag->ag_type == type)
 432                 return (0);
 433
 434         return (1);
 435 }
 436
 437 int
 438 auth_group_set_type_str(struct auth_group *ag, const char *str)
 439 {
 440         int error, type;
 441
 442         if (strcmp(str, "none") == 0) {
 443                 type = AG_TYPE_NO_AUTHENTICATION;
 444         } else if (strcmp(str, "deny") == 0) {
 445                 type = AG_TYPE_DENY;
 446         } else if (strcmp(str, "chap") == 0) {
 447                 type = AG_TYPE_CHAP;
 448         } else if (strcmp(str, "chap-mutual") == 0) {
 449                 type = AG_TYPE_CHAP_MUTUAL;
 450         } else {
 451                 if (ag->ag_name != NULL)
 452                         log_warnx("invalid auth-type \"%s\" for auth-group "
 453                             "\"%s\"", str, ag->ag_name);
 454                 else
 455                         log_warnx("invalid auth-type \"%s\" for target "
 456                             "\"%s\"", str, ag->ag_target->t_name);
 457                 return (1);
 458         }
 459
 460         error = auth_group_set_type(ag, type);
 461         if (error != 0) {
 462                 if (ag->ag_name != NULL)
 463                         log_warnx("cannot set auth-type to \"%s\" for "
 464                             "auth-group \"%s\"; already has a different "
 465                             "type", str, ag->ag_name);
 466                 else
 467                         log_warnx("cannot set auth-type to \"%s\" for target "
 468                             "\"%s\"; already has a different type",
 469                             str, ag->ag_target->t_name);
 470                 return (1);
 471         }
 472
 473         return (error);
 474 }
 475
 476 static struct portal *
 477 portal_new(struct portal_group *pg)
 478 {
 479         struct portal *portal;
 480
 481         portal = calloc(1, sizeof(*portal));
 482         if (portal == NULL)
 483                 log_err(1, "calloc");
 484         TAILQ_INIT(&portal->p_targets);
 485         portal->p_portal_group = pg;
 486         TAILQ_INSERT_TAIL(&pg->pg_portals, portal, p_next);
 487         return (portal);
 488 }
 489
 490 static void
 491 portal_delete(struct portal *portal)
 492 {
 493         TAILQ_REMOVE(&portal->p_portal_group->pg_portals, portal, p_next);
 494         freeaddrinfo(portal->p_ai);
 495         free(portal->p_listen);
 496         free(portal);
 497 }
 498
 499 struct portal_group *
 500 portal_group_new(struct conf *conf, const char *name)
 501 {
 502         struct portal_group *pg;
 503
 504         pg = portal_group_find(conf, name);
 505         if (pg != NULL) {
 506                 log_warnx("duplicated portal-group \"%s\"", name);
 507                 return (NULL);
 508         }
 509
 510         pg = calloc(1, sizeof(*pg));
 511         if (pg == NULL)
 512                 log_err(1, "calloc");
 513         pg->pg_name = checked_strdup(name);
 514         TAILQ_INIT(&pg->pg_portals);
 515         pg->pg_conf = conf;
 516         conf->conf_last_portal_group_tag++;
 517         pg->pg_tag = conf->conf_last_portal_group_tag;
 518         TAILQ_INSERT_TAIL(&conf->conf_portal_groups, pg, pg_next);
 519
 520         return (pg);
 521 }
 522
 523 void
 524 portal_group_delete(struct portal_group *pg)
 525 {
 526         struct portal *portal, *tmp;
 527
 528         TAILQ_REMOVE(&pg->pg_conf->conf_portal_groups, pg, pg_next);
 529
 530         TAILQ_FOREACH_SAFE(portal, &pg->pg_portals, p_next, tmp)
 531                 portal_delete(portal);
 532         free(pg->pg_name);
 533         free(pg);
 534 }
 535
 536 struct portal_group *
 537 portal_group_find(const struct conf *conf, const char *name)
 538 {
 539         struct portal_group *pg;
 540
 541         TAILQ_FOREACH(pg, &conf->conf_portal_groups, pg_next) {
 542                 if (strcmp(pg->pg_name, name) == 0)
 543                         return (pg);
 544         }
 545
 546         return (NULL);
 547 }
 548
 549 int
 550 portal_group_add_listen(struct portal_group *pg, const char *value, bool iser)
 551 {
 552         struct addrinfo hints;
 553         struct portal *portal;
 554         char *addr, *ch, *arg;
 555         const char *port;
 556         int error, colons = 0;
 557
 558         portal = portal_new(pg);
 559         portal->p_listen = checked_strdup(value);
 560         portal->p_iser = iser;
 561
 562         arg = portal->p_listen;
 563         if (arg[0] == '\0') {
 564                 log_warnx("empty listen address");
 565                 free(portal->p_listen);
 566                 free(portal);
 567                 return (1);
 568         }
 569         if (arg[0] == '[') {
 570                 /*
 571                  * IPv6 address in square brackets, perhaps with port.
 572                  */
 573                 arg++;
 574                 addr = strsep(&arg, "]");
 575                 if (arg == NULL) {
 576                         log_warnx("invalid listen address %s",
 577                             portal->p_listen);
 578                         free(portal->p_listen);
 579                         free(portal);
 580                         return (1);
 581                 }
 582                 if (arg[0] == '\0') {
 583                         port = "3260";
 584                 } else if (arg[0] == ':') {
 585                         port = arg + 1;
 586                 } else {
 587                         log_warnx("invalid listen address %s",
 588                             portal->p_listen);
 589                         free(portal->p_listen);
 590                         free(portal);
 591                         return (1);
 592                 }
 593         } else {
 594                 /*
 595                  * Either IPv6 address without brackets - and without
 596                  * a port - or IPv4 address.  Just count the colons.
 597                  */
 598                 for (ch = arg; *ch != '\0'; ch++) {
 599                         if (*ch == ':')
 600                                 colons++;
 601                 }
 602                 if (colons > 1) {
 603                         addr = arg;
 604                         port = "3260";
 605                 } else {
 606                         addr = strsep(&arg, ":");
 607                         if (arg == NULL)
 608                                 port = "3260";
 609                         else
 610                                 port = arg;
 611                 }
 612         }
 613
 614         memset(&hints, 0, sizeof(hints));
 615         hints.ai_family = PF_UNSPEC;
 616         hints.ai_socktype = SOCK_STREAM;
 617         hints.ai_flags = AI_PASSIVE;
 618
 619         error = getaddrinfo(addr, port, &hints, &portal->p_ai);
 620         if (error != 0) {
 621                 log_warnx("getaddrinfo for %s failed: %s",
 622                     portal->p_listen, gai_strerror(error));
 623                 free(portal->p_listen);
 624                 free(portal);
 625                 return (1);
 626         }
 627
 628         /*
 629          * XXX: getaddrinfo(3) may return multiple addresses; we should turn
 630          *      those into multiple portals.
 631          */
 632
 633         return (0);
 634 }
 635
 636 static bool
 637 valid_hex(const char ch)
 638 {
 639         switch (ch) {
 640         case '0':
 641         case '1':
 642         case '2':
 643         case '3':
 644         case '4':
 645         case '5':
 646         case '6':
 647         case '7':
 648         case '8':
 649         case '9':
 650         case 'a':
 651         case 'A':
 652         case 'b':
 653         case 'B':
 654         case 'c':
 655         case 'C':
 656         case 'd':
 657         case 'D':
 658         case 'e':
 659         case 'E':
 660         case 'f':
 661         case 'F':
 662                 return (true);
 663         default:
 664                 return (false);
 665         }
 666 }
 667
 668 bool
 669 valid_iscsi_name(const char *name)
 670 {
 671         int i;
 672
 673         if (strlen(name) >= MAX_NAME_LEN) {
 674                 log_warnx("overlong name for target \"%s\"; max length allowed "
 675                     "by iSCSI specification is %d characters",
 676                     name, MAX_NAME_LEN);
 677                 return (false);
 678         }
 679
 680         /*
 681          * In the cases below, we don't return an error, just in case the admin
 682          * was right, and we're wrong.
 683          */
 684         if (strncasecmp(name, "iqn.", strlen("iqn.")) == 0) {
 685                 for (i = strlen("iqn."); name[i] != '\0'; i++) {
 686                         /*
 687                          * XXX: We should verify UTF-8 normalisation, as defined
 688                          *      by 3.2.6.2: iSCSI Name Encoding.
 689                          */
 690                         if (isalnum(name[i]))
 691                                 continue;
 692                         if (name[i] == '-' || name[i] == '.' || name[i] == ':')
 693                                 continue;
 694                         log_warnx("invalid character \"%c\" in target name "
 695                             "\"%s\"; allowed characters are letters, digits, "
 696                             "'-', '.', and ':'", name[i], name);
 697                         break;
 698                 }
 699                 /*
 700                  * XXX: Check more stuff: valid date and a valid reversed domain.
 701                  */
 702         } else if (strncasecmp(name, "eui.", strlen("eui.")) == 0) {
 703                 if (strlen(name) != strlen("eui.") + 16)
 704                         log_warnx("invalid target name \"%s\"; the \"eui.\" "
 705                             "should be followed by exactly 16 hexadecimal "
 706                             "digits", name);
 707                 for (i = strlen("eui."); name[i] != '\0'; i++) {
 708                         if (!valid_hex(name[i])) {
 709                                 log_warnx("invalid character \"%c\" in target "
 710                                     "name \"%s\"; allowed characters are 1-9 "
 711                                     "and A-F", name[i], name);
 712                                 break;
 713                         }
 714                 }
 715         } else if (strncasecmp(name, "naa.", strlen("naa.")) == 0) {
 716                 if (strlen(name) > strlen("naa.") + 32)
 717                         log_warnx("invalid target name \"%s\"; the \"naa.\" "
 718                             "should be followed by at most 32 hexadecimal "
 719                             "digits", name);
 720                 for (i = strlen("naa."); name[i] != '\0'; i++) {
 721                         if (!valid_hex(name[i])) {
 722                                 log_warnx("invalid character \"%c\" in target "
 723                                     "name \"%s\"; allowed characters are 1-9 "
 724                                     "and A-F", name[i], name);
 725                                 break;
 726                         }
 727                 }
 728         } else {
 729                 log_warnx("invalid target name \"%s\"; should start with "
 730                     "either \".iqn\", \"eui.\", or \"naa.\"",
 731                     name);
 732         }
 733         return (true);
 734 }
 735
 736 struct target *
 737 target_new(struct conf *conf, const char *name)
 738 {
 739         struct target *targ;
 740         int i, len;
 741
 742         targ = target_find(conf, name);
 743         if (targ != NULL) {
 744                 log_warnx("duplicated target \"%s\"", name);
 745                 return (NULL);
 746         }
 747         if (valid_iscsi_name(name) == false) {
 748                 log_warnx("target name \"%s\" is invalid", name);
 749                 return (NULL);
 750         }
 751         targ = calloc(1, sizeof(*targ));
 752         if (targ == NULL)
 753                 log_err(1, "calloc");
 754         targ->t_name = checked_strdup(name);
 755
 756         /*
 757          * RFC 3722 requires us to normalize the name to lowercase.
 758          */
 759         len = strlen(name);
 760         for (i = 0; i < len; i++)
 761                 targ->t_name[i] = tolower(targ->t_name[i]);
 762
 763         TAILQ_INIT(&targ->t_luns);
 764         targ->t_conf = conf;
 765         TAILQ_INSERT_TAIL(&conf->conf_targets, targ, t_next);
 766
 767         return (targ);
 768 }
 769
 770 void
 771 target_delete(struct target *targ)
 772 {
 773         struct lun *lun, *tmp;
 774
 775         TAILQ_REMOVE(&targ->t_conf->conf_targets, targ, t_next);
 776
 777         TAILQ_FOREACH_SAFE(lun, &targ->t_luns, l_next, tmp)
 778                 lun_delete(lun);
 779         free(targ->t_name);
 780         free(targ);
 781 }
 782
 783 struct target *
 784 target_find(struct conf *conf, const char *name)
 785 {
 786         struct target *targ;
 787
 788         TAILQ_FOREACH(targ, &conf->conf_targets, t_next) {
 789                 if (strcasecmp(targ->t_name, name) == 0)
 790                         return (targ);
 791         }
 792
 793         return (NULL);
 794 }
 795
 796 struct lun *
 797 lun_new(struct target *targ, int lun_id)
 798 {
 799         struct lun *lun;
 800
 801         lun = lun_find(targ, lun_id);
 802         if (lun != NULL) {
 803                 log_warnx("duplicated lun %d for target \"%s\"",
 804                     lun_id, targ->t_name);
 805                 return (NULL);
 806         }
 807
 808         lun = calloc(1, sizeof(*lun));
 809         if (lun == NULL)
 810                 log_err(1, "calloc");
 811         lun->l_lun = lun_id;
 812         TAILQ_INIT(&lun->l_options);
 813         lun->l_target = targ;
 814         TAILQ_INSERT_TAIL(&targ->t_luns, lun, l_next);
 815
 816         return (lun);
 817 }
 818
 819 void
 820 lun_delete(struct lun *lun)
 821 {
 822         struct lun_option *lo, *tmp;
 823
 824         TAILQ_REMOVE(&lun->l_target->t_luns, lun, l_next);
 825
 826         TAILQ_FOREACH_SAFE(lo, &lun->l_options, lo_next, tmp)
 827                 lun_option_delete(lo);
 828         free(lun->l_backend);
 829         free(lun->l_device_id);
 830         free(lun->l_path);
 831         free(lun->l_serial);
 832         free(lun);
 833 }
 834
 835 struct lun *
 836 lun_find(const struct target *targ, int lun_id)
 837 {
 838         struct lun *lun;
 839
 840         TAILQ_FOREACH(lun, &targ->t_luns, l_next) {
 841                 if (lun->l_lun == lun_id)
 842                         return (lun);
 843         }
 844
 845         return (NULL);
 846 }
 847
 848 void
 849 lun_set_backend(struct lun *lun, const char *value)
 850 {
 851         free(lun->l_backend);
 852         lun->l_backend = checked_strdup(value);
 853 }
 854
 855 void
 856 lun_set_blocksize(struct lun *lun, size_t value)
 857 {
 858
 859         lun->l_blocksize = value;
 860 }
 861
 862 void
 863 lun_set_device_id(struct lun *lun, const char *value)
 864 {
 865         free(lun->l_device_id);
 866         lun->l_device_id = checked_strdup(value);
 867 }
 868
 869 void
 870 lun_set_path(struct lun *lun, const char *value)
 871 {
 872         free(lun->l_path);
 873         lun->l_path = checked_strdup(value);
 874 }
 875
 876 void
 877 lun_set_serial(struct lun *lun, const char *value)
 878 {
 879         free(lun->l_serial);
 880         lun->l_serial = checked_strdup(value);
 881 }
 882
 883 void
 884 lun_set_size(struct lun *lun, size_t value)
 885 {
 886
 887         lun->l_size = value;
 888 }
 889
 890 void
 891 lun_set_ctl_lun(struct lun *lun, uint32_t value)
 892 {
 893
 894         lun->l_ctl_lun = value;
 895 }
 896
 897 struct lun_option *
 898 lun_option_new(struct lun *lun, const char *name, const char *value)
 899 {
 900         struct lun_option *lo;
 901
 902         lo = lun_option_find(lun, name);
 903         if (lo != NULL) {
 904                 log_warnx("duplicated lun option %s for lun %d, target \"%s\"",
 905                     name, lun->l_lun, lun->l_target->t_name);
 906                 return (NULL);
 907         }
 908
 909         lo = calloc(1, sizeof(*lo));
 910         if (lo == NULL)
 911                 log_err(1, "calloc");
 912         lo->lo_name = checked_strdup(name);
 913         lo->lo_value = checked_strdup(value);
 914         lo->lo_lun = lun;
 915         TAILQ_INSERT_TAIL(&lun->l_options, lo, lo_next);
 916
 917         return (lo);
 918 }
 919
 920 void
 921 lun_option_delete(struct lun_option *lo)
 922 {
 923
 924         TAILQ_REMOVE(&lo->lo_lun->l_options, lo, lo_next);
 925
 926         free(lo->lo_name);
 927         free(lo->lo_value);
 928         free(lo);
 929 }
 930
 931 struct lun_option *
 932 lun_option_find(const struct lun *lun, const char *name)
 933 {
 934         struct lun_option *lo;
 935
 936         TAILQ_FOREACH(lo, &lun->l_options, lo_next) {
 937                 if (strcmp(lo->lo_name, name) == 0)
 938                         return (lo);
 939         }
 940
 941         return (NULL);
 942 }
 943
 944 void
 945 lun_option_set(struct lun_option *lo, const char *value)
 946 {
 947
 948         free(lo->lo_value);
 949         lo->lo_value = checked_strdup(value);
 950 }
 951
 952 static struct connection *
 953 connection_new(struct portal *portal, int fd, const char *host)
 954 {
 955         struct connection *conn;
 956
 957         conn = calloc(1, sizeof(*conn));
 958         if (conn == NULL)
 959                 log_err(1, "calloc");
 960         conn->conn_portal = portal;
 961         conn->conn_socket = fd;
 962         conn->conn_initiator_addr = checked_strdup(host);
 963
 964         /*
 965          * Default values, from RFC 3720, section 12.
 966          */
 967         conn->conn_max_data_segment_length = 8192;
 968         conn->conn_max_burst_length = 262144;
 969         conn->conn_immediate_data = true;
 970
 971         return (conn);
 972 }
 973
 974 #if 0
 975 static void
 976 conf_print(struct conf *conf)
 977 {
 978         struct auth_group *ag;
 979         struct auth *auth;
 980         struct auth_name *auth_name;
 981         struct auth_portal *auth_portal;
 982         struct portal_group *pg;
 983         struct portal *portal;
 984         struct target *targ;
 985         struct lun *lun;
 986         struct lun_option *lo;
 987
 988         TAILQ_FOREACH(ag, &conf->conf_auth_groups, ag_next) {
 989                 fprintf(stderr, "auth-group %s {\n", ag->ag_name);
 990                 TAILQ_FOREACH(auth, &ag->ag_auths, a_next)
 991                         fprintf(stderr, "\t chap-mutual %s %s %s %s\n",
 992                             auth->a_user, auth->a_secret,
 993                             auth->a_mutual_user, auth->a_mutual_secret);
 994                 TAILQ_FOREACH(auth_name, &ag->ag_names, an_next)
 995                         fprintf(stderr, "\t initiator-name %s\n",
 996                             auth_name->an_initator_name);
 997                 TAILQ_FOREACH(auth_portal, &ag->ag_portals, an_next)
 998                         fprintf(stderr, "\t initiator-portal %s\n",
 999                             auth_portal->an_initator_portal);
1000                 fprintf(stderr, "}\n");
1001         }
1002         TAILQ_FOREACH(pg, &conf->conf_portal_groups, pg_next) {
1003                 fprintf(stderr, "portal-group %s {\n", pg->pg_name);
1004                 TAILQ_FOREACH(portal, &pg->pg_portals, p_next)
1005                         fprintf(stderr, "\t listen %s\n", portal->p_listen);
1006                 fprintf(stderr, "}\n");
1007         }
1008         TAILQ_FOREACH(targ, &conf->conf_targets, t_next) {
1009                 fprintf(stderr, "target %s {\n", targ->t_name);
1010                 if (targ->t_alias != NULL)
1011                         fprintf(stderr, "\t alias %s\n", targ->t_alias);
1012                 TAILQ_FOREACH(lun, &targ->t_luns, l_next) {
1013                         fprintf(stderr, "\tlun %d {\n", lun->l_lun);
1014                         fprintf(stderr, "\t\tpath %s\n", lun->l_path);
1015                         TAILQ_FOREACH(lo, &lun->l_options, lo_next)
1016                                 fprintf(stderr, "\t\toption %s %s\n",
1017                                     lo->lo_name, lo->lo_value);
1018                         fprintf(stderr, "\t}\n");
1019                 }
1020                 fprintf(stderr, "}\n");
1021         }
1022 }
1023 #endif
1024
1025 static int
1026 conf_verify_lun(struct lun *lun)
1027 {
1028         const struct lun *lun2;
1029         const struct target *targ2;
1030
1031         if (lun->l_backend == NULL)
1032                 lun_set_backend(lun, "block");
1033         if (strcmp(lun->l_backend, "block") == 0) {
1034                 if (lun->l_path == NULL) {
1035                         log_warnx("missing path for lun %d, target \"%s\"",
1036                             lun->l_lun, lun->l_target->t_name);
1037                         return (1);
1038                 }
1039         } else if (strcmp(lun->l_backend, "ramdisk") == 0) {
1040                 if (lun->l_size == 0) {
1041                         log_warnx("missing size for ramdisk-backed lun %d, "
1042                             "target \"%s\"", lun->l_lun, lun->l_target->t_name);
1043                         return (1);
1044                 }
1045                 if (lun->l_path != NULL) {
1046                         log_warnx("path must not be specified "
1047                             "for ramdisk-backed lun %d, target \"%s\"",
1048                             lun->l_lun, lun->l_target->t_name);
1049                         return (1);
1050                 }
1051         }
1052         if (lun->l_lun < 0 || lun->l_lun > 255) {
1053                 log_warnx("invalid lun number for lun %d, target \"%s\"; "
1054                     "must be between 0 and 255", lun->l_lun,
1055                     lun->l_target->t_name);
1056                 return (1);
1057         }
1058         if (lun->l_blocksize == 0) {
1059                 lun_set_blocksize(lun, DEFAULT_BLOCKSIZE);
1060         } else if (lun->l_blocksize < 0) {
1061                 log_warnx("invalid blocksize for lun %d, target \"%s\"; "
1062                     "must be larger than 0", lun->l_lun, lun->l_target->t_name);
1063                 return (1);
1064         }
1065         if (lun->l_size != 0 && lun->l_size % lun->l_blocksize != 0) {
1066                 log_warnx("invalid size for lun %d, target \"%s\"; "
1067                     "must be multiple of blocksize", lun->l_lun,
1068                     lun->l_target->t_name);
1069                 return (1);
1070         }
1071         TAILQ_FOREACH(targ2, &lun->l_target->t_conf->conf_targets, t_next) {
1072                 TAILQ_FOREACH(lun2, &targ2->t_luns, l_next) {
1073                         if (lun == lun2)
1074                                 continue;
1075                         if (lun->l_path != NULL && lun2->l_path != NULL &&
1076                             strcmp(lun->l_path, lun2->l_path) == 0) {
1077                                 log_debugx("WARNING: path \"%s\" duplicated "
1078                                     "between lun %d, target \"%s\", and "
1079                                     "lun %d, target \"%s\"", lun->l_path,
1080                                     lun->l_lun, lun->l_target->t_name,
1081                                     lun2->l_lun, lun2->l_target->t_name);
1082                         }
1083                 }
1084         }
1085
1086         return (0);
1087 }
1088
1089 int
1090 conf_verify(struct conf *conf)
1091 {
1092         struct auth_group *ag;
1093         struct portal_group *pg;
1094         struct target *targ;
1095         struct lun *lun;
1096         bool found_lun;
1097         int error;
1098
1099         if (conf->conf_pidfile_path == NULL)
1100                 conf->conf_pidfile_path = checked_strdup(DEFAULT_PIDFILE);
1101
1102         TAILQ_FOREACH(targ, &conf->conf_targets, t_next) {
1103                 if (targ->t_auth_group == NULL) {
1104                         targ->t_auth_group = auth_group_find(conf,
1105                             "default");
1106                         assert(targ->t_auth_group != NULL);
1107                 }
1108                 if (targ->t_portal_group == NULL) {
1109                         targ->t_portal_group = portal_group_find(conf,
1110                             "default");
1111                         assert(targ->t_portal_group != NULL);
1112                 }
1113                 found_lun = false;
1114                 TAILQ_FOREACH(lun, &targ->t_luns, l_next) {
1115                         error = conf_verify_lun(lun);
1116                         if (error != 0)
1117                                 return (error);
1118                         found_lun = true;
1119                 }
1120                 if (!found_lun) {
1121                         log_warnx("no LUNs defined for target \"%s\"",
1122                             targ->t_name);
1123                 }
1124         }
1125         TAILQ_FOREACH(pg, &conf->conf_portal_groups, pg_next) {
1126                 assert(pg->pg_name != NULL);
1127                 if (pg->pg_discovery_auth_group == NULL) {
1128                         pg->pg_discovery_auth_group =
1129                             auth_group_find(conf, "default");
1130                         assert(pg->pg_discovery_auth_group != NULL);
1131                 }
1132
1133                 TAILQ_FOREACH(targ, &conf->conf_targets, t_next) {
1134                         if (targ->t_portal_group == pg)
1135                                 break;
1136                 }
1137                 if (targ == NULL) {
1138                         if (strcmp(pg->pg_name, "default") != 0)
1139                                 log_warnx("portal-group \"%s\" not assigned "
1140                                     "to any target", pg->pg_name);
1141                         pg->pg_unassigned = true;
1142                 } else
1143                         pg->pg_unassigned = false;
1144         }
1145         TAILQ_FOREACH(ag, &conf->conf_auth_groups, ag_next) {
1146                 if (ag->ag_name == NULL)
1147                         assert(ag->ag_target != NULL);
1148                 else
1149                         assert(ag->ag_target == NULL);
1150
1151                 TAILQ_FOREACH(targ, &conf->conf_targets, t_next) {
1152                         if (targ->t_auth_group == ag)
1153                                 break;
1154                 }
1155                 if (targ == NULL && ag->ag_name != NULL &&
1156                     strcmp(ag->ag_name, "default") != 0 &&
1157                     strcmp(ag->ag_name, "no-authentication") != 0 &&
1158                     strcmp(ag->ag_name, "no-access") != 0) {
1159                         log_warnx("auth-group \"%s\" not assigned "
1160                             "to any target", ag->ag_name);
1161                 }
1162         }
1163
1164         return (0);
1165 }
1166
1167 static int
1168 conf_apply(struct conf *oldconf, struct conf *newconf)
1169 {
1170         struct target *oldtarg, *newtarg, *tmptarg;
1171         struct lun *oldlun, *newlun, *tmplun;
1172         struct portal_group *oldpg, *newpg;
1173         struct portal *oldp, *newp;
1174         pid_t otherpid;
1175         int changed, cumulated_error = 0, error;
1176         int one = 1;
1177
1178         if (oldconf->conf_debug != newconf->conf_debug) {
1179                 log_debugx("changing debug level to %d", newconf->conf_debug);
1180                 log_init(newconf->conf_debug);
1181         }
1182
1183         if (oldconf->conf_pidfh != NULL) {
1184                 assert(oldconf->conf_pidfile_path != NULL);
1185                 if (newconf->conf_pidfile_path != NULL &&
1186                     strcmp(oldconf->conf_pidfile_path,
1187                     newconf->conf_pidfile_path) == 0) {
1188                         newconf->conf_pidfh = oldconf->conf_pidfh;
1189                         oldconf->conf_pidfh = NULL;
1190                 } else {
1191                         log_debugx("removing pidfile %s",
1192                             oldconf->conf_pidfile_path);
1193                         pidfile_remove(oldconf->conf_pidfh);
1194                         oldconf->conf_pidfh = NULL;
1195                 }
1196         }
1197
1198         if (newconf->conf_pidfh == NULL && newconf->conf_pidfile_path != NULL) {
1199                 log_debugx("opening pidfile %s", newconf->conf_pidfile_path);
1200                 newconf->conf_pidfh =
1201                     pidfile_open(newconf->conf_pidfile_path, 0600, &otherpid);
1202                 if (newconf->conf_pidfh == NULL) {
1203                         if (errno == EEXIST)
1204                                 log_errx(1, "daemon already running, pid: %jd.",
1205                                     (intmax_t)otherpid);
1206                         log_err(1, "cannot open or create pidfile \"%s\"",
1207                             newconf->conf_pidfile_path);
1208                 }
1209         }
1210
1211         /*
1212          * XXX: If target or lun removal fails, we should somehow "move"
1213          *      the old lun or target into newconf, so that subsequent
1214          *      conf_apply() would try to remove them again.  That would
1215          *      be somewhat hairy, though, and lun deletion failures don't
1216          *      really happen, so leave it as it is for now.
1217          */
1218         TAILQ_FOREACH_SAFE(oldtarg, &oldconf->conf_targets, t_next, tmptarg) {
1219                 /*
1220                  * First, remove any targets present in the old configuration
1221                  * and missing in the new one.
1222                  */
1223                 newtarg = target_find(newconf, oldtarg->t_name);
1224                 if (newtarg == NULL) {
1225                         TAILQ_FOREACH_SAFE(oldlun, &oldtarg->t_luns, l_next,
1226                             tmplun) {
1227                                 log_debugx("target %s not found in new "
1228                                     "configuration; removing its lun %d, "
1229                                     "backed by CTL lun %d",
1230                                     oldtarg->t_name, oldlun->l_lun,
1231                                     oldlun->l_ctl_lun);
1232                                 error = kernel_lun_remove(oldlun);
1233                                 if (error != 0) {
1234                                         log_warnx("failed to remove lun %d, "
1235                                             "target %s, CTL lun %d",
1236                                             oldlun->l_lun, oldtarg->t_name,
1237                                             oldlun->l_ctl_lun);
1238                                         cumulated_error++;
1239                                 }
1240                                 lun_delete(oldlun);
1241                         }
1242                         kernel_port_remove(oldtarg);
1243                         target_delete(oldtarg);
1244                         continue;
1245                 }
1246
1247                 /*
1248                  * Second, remove any LUNs present in the old target
1249                  * and missing in the new one.
1250                  */
1251                 TAILQ_FOREACH_SAFE(oldlun, &oldtarg->t_luns, l_next, tmplun) {
1252                         newlun = lun_find(newtarg, oldlun->l_lun);
1253                         if (newlun == NULL) {
1254                                 log_debugx("lun %d, target %s, CTL lun %d "
1255                                     "not found in new configuration; "
1256                                     "removing", oldlun->l_lun, oldtarg->t_name,
1257                                     oldlun->l_ctl_lun);
1258                                 error = kernel_lun_remove(oldlun);
1259                                 if (error != 0) {
1260                                         log_warnx("failed to remove lun %d, "
1261                                             "target %s, CTL lun %d",
1262                                             oldlun->l_lun, oldtarg->t_name,
1263                                             oldlun->l_ctl_lun);
1264                                         cumulated_error++;
1265                                 }
1266                                 lun_delete(oldlun);
1267                                 continue;
1268                         }
1269
1270                         /*
1271                          * Also remove the LUNs changed by more than size.
1272                          */
1273                         changed = 0;
1274                         assert(oldlun->l_backend != NULL);
1275                         assert(newlun->l_backend != NULL);
1276                         if (strcmp(newlun->l_backend, oldlun->l_backend) != 0) {
1277                                 log_debugx("backend for lun %d, target %s, "
1278                                     "CTL lun %d changed; removing",
1279                                     oldlun->l_lun, oldtarg->t_name,
1280                                     oldlun->l_ctl_lun);
1281                                 changed = 1;
1282                         }
1283                         if (oldlun->l_blocksize != newlun->l_blocksize) {
1284                                 log_debugx("blocksize for lun %d, target %s, "
1285                                     "CTL lun %d changed; removing",
1286                                     oldlun->l_lun, oldtarg->t_name,
1287                                     oldlun->l_ctl_lun);
1288                                 changed = 1;
1289                         }
1290                         if (newlun->l_device_id != NULL &&
1291                             (oldlun->l_device_id == NULL ||
1292                              strcmp(oldlun->l_device_id, newlun->l_device_id) !=
1293                              0)) {
1294                                 log_debugx("device-id for lun %d, target %s, "
1295                                     "CTL lun %d changed; removing",
1296                                     oldlun->l_lun, oldtarg->t_name,
1297                                     oldlun->l_ctl_lun);
1298                                 changed = 1;
1299                         }
1300                         if (newlun->l_path != NULL &&
1301                             (oldlun->l_path == NULL ||
1302                              strcmp(oldlun->l_path, newlun->l_path) != 0)) {
1303                                 log_debugx("path for lun %d, target %s, "
1304                                     "CTL lun %d, changed; removing",
1305                                     oldlun->l_lun, oldtarg->t_name,
1306                                     oldlun->l_ctl_lun);
1307                                 changed = 1;
1308                         }
1309                         if (newlun->l_serial != NULL &&
1310                             (oldlun->l_serial == NULL ||
1311                              strcmp(oldlun->l_serial, newlun->l_serial) != 0)) {
1312                                 log_debugx("serial for lun %d, target %s, "
1313                                     "CTL lun %d changed; removing",
1314                                     oldlun->l_lun, oldtarg->t_name,
1315                                     oldlun->l_ctl_lun);
1316                                 changed = 1;
1317                         }
1318                         if (changed) {
1319                                 error = kernel_lun_remove(oldlun);
1320                                 if (error != 0) {
1321                                         log_warnx("failed to remove lun %d, "
1322                                             "target %s, CTL lun %d",
1323                                             oldlun->l_lun, oldtarg->t_name,
1324                                             oldlun->l_ctl_lun);
1325                                         cumulated_error++;
1326                                 }
1327                                 lun_delete(oldlun);
1328                                 continue;
1329                         }
1330
1331                         lun_set_ctl_lun(newlun, oldlun->l_ctl_lun);
1332                 }
1333         }
1334
1335         /*
1336          * Now add new targets or modify existing ones.
1337          */
1338         TAILQ_FOREACH(newtarg, &newconf->conf_targets, t_next) {
1339                 oldtarg = target_find(oldconf, newtarg->t_name);
1340
1341                 TAILQ_FOREACH_SAFE(newlun, &newtarg->t_luns, l_next, tmplun) {
1342                         if (oldtarg != NULL) {
1343                                 oldlun = lun_find(oldtarg, newlun->l_lun);
1344                                 if (oldlun != NULL) {
1345                                         if (newlun->l_size != oldlun->l_size) {
1346                                                 log_debugx("resizing lun %d, "
1347                                                     "target %s, CTL lun %d",
1348                                                     newlun->l_lun,
1349                                                     newtarg->t_name,
1350                                                     newlun->l_ctl_lun);
1351                                                 error =
1352                                                     kernel_lun_resize(newlun);
1353                                                 if (error != 0) {
1354                                                         log_warnx("failed to "
1355                                                             "resize lun %d, "
1356                                                             "target %s, "
1357                                                             "CTL lun %d",
1358                                                             newlun->l_lun,
1359                                                             newtarg->t_name,
1360                                                             newlun->l_lun);
1361                                                         cumulated_error++;
1362                                                 }
1363                                         }
1364                                         continue;
1365                                 }
1366                         }
1367                         log_debugx("adding lun %d, target %s",
1368                             newlun->l_lun, newtarg->t_name);
1369                         error = kernel_lun_add(newlun);
1370                         if (error != 0) {
1371                                 log_warnx("failed to add lun %d, target %s",
1372                                     newlun->l_lun, newtarg->t_name);
1373                                 lun_delete(newlun);
1374                                 cumulated_error++;
1375                         }
1376                 }
1377                 if (oldtarg == NULL)
1378                         kernel_port_add(newtarg);
1379         }
1380
1381         /*
1382          * Go through the new portals, opening the sockets as neccessary.
1383          */
1384         TAILQ_FOREACH(newpg, &newconf->conf_portal_groups, pg_next) {
1385                 if (newpg->pg_unassigned) {
1386                         log_debugx("not listening on portal-group \"%s\", "
1387                             "not assigned to any target",
1388                             newpg->pg_name);
1389                         continue;
1390                 }
1391                 TAILQ_FOREACH(newp, &newpg->pg_portals, p_next) {
1392                         /*
1393                          * Try to find already open portal and reuse
1394                          * the listening socket.  We don't care about
1395                          * what portal or portal group that was, what
1396                          * matters is the listening address.
1397                          */
1398                         TAILQ_FOREACH(oldpg, &oldconf->conf_portal_groups,
1399                             pg_next) {
1400                                 TAILQ_FOREACH(oldp, &oldpg->pg_portals,
1401                                     p_next) {
1402                                         if (strcmp(newp->p_listen,
1403                                             oldp->p_listen) == 0 &&
1404                                             oldp->p_socket > 0) {
1405                                                 newp->p_socket =
1406                                                     oldp->p_socket;
1407                                                 oldp->p_socket = 0;
1408                                                 break;
1409                                         }
1410                                 }
1411                         }
1412                         if (newp->p_socket > 0) {
1413                                 /*
1414                                  * We're done with this portal.
1415                                  */
1416                                 continue;
1417                         }
1418
1419 #ifdef ICL_KERNEL_PROXY
1420                         if (proxy_mode) {
1421                                 newpg->pg_conf->conf_portal_id++;
1422                                 newp->p_id = newpg->pg_conf->conf_portal_id;
1423                                 log_debugx("listening on %s, portal-group "
1424                                     "\"%s\", portal id %d, using ICL proxy",
1425                                     newp->p_listen, newpg->pg_name, newp->p_id);
1426                                 kernel_listen(newp->p_ai, newp->p_iser,
1427                                     newp->p_id);
1428                                 continue;
1429                         }
1430 #endif
1431                         assert(proxy_mode == false);
1432                         assert(newp->p_iser == false);
1433
1434                         log_debugx("listening on %s, portal-group \"%s\"",
1435                             newp->p_listen, newpg->pg_name);
1436                         newp->p_socket = socket(newp->p_ai->ai_family,
1437                             newp->p_ai->ai_socktype,
1438                             newp->p_ai->ai_protocol);
1439                         if (newp->p_socket < 0) {
1440                                 log_warn("socket(2) failed for %s",
1441                                     newp->p_listen);
1442                                 cumulated_error++;
1443                                 continue;
1444                         }
1445                         error = setsockopt(newp->p_socket, SOL_SOCKET,
1446                             SO_REUSEADDR, &one, sizeof(one));
1447                         if (error != 0) {
1448                                 log_warn("setsockopt(SO_REUSEADDR) failed "
1449                                     "for %s", newp->p_listen);
1450                                 close(newp->p_socket);
1451                                 newp->p_socket = 0;
1452                                 cumulated_error++;
1453                                 continue;
1454                         }
1455                         error = bind(newp->p_socket, newp->p_ai->ai_addr,
1456                             newp->p_ai->ai_addrlen);
1457                         if (error != 0) {
1458                                 log_warn("bind(2) failed for %s",
1459                                     newp->p_listen);
1460                                 close(newp->p_socket);
1461                                 newp->p_socket = 0;
1462                                 cumulated_error++;
1463                                 continue;
1464                         }
1465                         error = listen(newp->p_socket, -1);
1466                         if (error != 0) {
1467                                 log_warn("listen(2) failed for %s",
1468                                     newp->p_listen);
1469                                 close(newp->p_socket);
1470                                 newp->p_socket = 0;
1471                                 cumulated_error++;
1472                                 continue;
1473                         }
1474                 }
1475         }
1476
1477         /*
1478          * Go through the no longer used sockets, closing them.
1479          */
1480         TAILQ_FOREACH(oldpg, &oldconf->conf_portal_groups, pg_next) {
1481                 TAILQ_FOREACH(oldp, &oldpg->pg_portals, p_next) {
1482                         if (oldp->p_socket <= 0)
1483                                 continue;
1484                         log_debugx("closing socket for %s, portal-group \"%s\"",
1485                             oldp->p_listen, oldpg->pg_name);
1486                         close(oldp->p_socket);
1487                         oldp->p_socket = 0;
1488                 }
1489         }
1490
1491         return (cumulated_error);
1492 }
1493
1494 bool
1495 timed_out(void)
1496 {
1497
1498         return (sigalrm_received);
1499 }
1500
1501 static void
1502 sigalrm_handler(int dummy __unused)
1503 {
1504         /*
1505          * It would be easiest to just log an error and exit.  We can't
1506          * do this, though, because log_errx() is not signal safe, since
1507          * it calls syslog(3).  Instead, set a flag checked by pdu_send()
1508          * and pdu_receive(), to call log_errx() there.  Should they fail
1509          * to notice, we'll exit here one second later.
1510          */
1511         if (sigalrm_received) {
1512                 /*
1513                  * Oh well.  Just give up and quit.
1514                  */
1515                 _exit(2);
1516         }
1517
1518         sigalrm_received = true;
1519 }
1520
1521 static void
1522 set_timeout(const struct conf *conf)
1523 {
1524         struct sigaction sa;
1525         struct itimerval itv;
1526         int error;
1527
1528         if (conf->conf_timeout <= 0) {
1529                 log_debugx("session timeout disabled");
1530                 return;
1531         }
1532
1533         bzero(&sa, sizeof(sa));
1534         sa.sa_handler = sigalrm_handler;
1535         sigfillset(&sa.sa_mask);
1536         error = sigaction(SIGALRM, &sa, NULL);
1537         if (error != 0)
1538                 log_err(1, "sigaction");
1539
1540         /*
1541          * First SIGALRM will arive after conf_timeout seconds.
1542          * If we do nothing, another one will arrive a second later.
1543          */
1544         bzero(&itv, sizeof(itv));
1545         itv.it_interval.tv_sec = 1;
1546         itv.it_value.tv_sec = conf->conf_timeout;
1547
1548         log_debugx("setting session timeout to %d seconds",
1549             conf->conf_timeout);
1550         error = setitimer(ITIMER_REAL, &itv, NULL);
1551         if (error != 0)
1552                 log_err(1, "setitimer");
1553 }
1554
1555 static int
1556 wait_for_children(bool block)
1557 {
1558         pid_t pid;
1559         int status;
1560         int num = 0;
1561
1562         for (;;) {
1563                 /*
1564                  * If "block" is true, wait for at least one process.
1565                  */
1566                 if (block && num == 0)
1567                         pid = wait4(-1, &status, 0, NULL);
1568                 else
1569                         pid = wait4(-1, &status, WNOHANG, NULL);
1570                 if (pid <= 0)
1571                         break;
1572                 if (WIFSIGNALED(status)) {
1573                         log_warnx("child process %d terminated with signal %d",
1574                             pid, WTERMSIG(status));
1575                 } else if (WEXITSTATUS(status) != 0) {
1576                         log_warnx("child process %d terminated with exit status %d",
1577                             pid, WEXITSTATUS(status));
1578                 } else {
1579                         log_debugx("child process %d terminated gracefully", pid);
1580                 }
1581                 num++;
1582         }
1583
1584         return (num);
1585 }
1586
1587 static void
1588 handle_connection(struct portal *portal, int fd,
1589     const struct sockaddr *client_sa, socklen_t client_salen, bool dont_fork)
1590 {
1591         struct connection *conn;
1592         int error;
1593         pid_t pid;
1594         char host[NI_MAXHOST + 1];
1595         struct conf *conf;
1596
1597         conf = portal->p_portal_group->pg_conf;
1598
1599         if (dont_fork) {
1600                 log_debugx("incoming connection; not forking due to -d flag");
1601         } else {
1602                 nchildren -= wait_for_children(false);
1603                 assert(nchildren >= 0);
1604
1605                 while (conf->conf_maxproc > 0 && nchildren >= conf->conf_maxproc) {
1606                         log_debugx("maxproc limit of %d child processes hit; "
1607                             "waiting for child process to exit", conf->conf_maxproc);
1608                         nchildren -= wait_for_children(true);
1609                         assert(nchildren >= 0);
1610                 }
1611                 log_debugx("incoming connection; forking child process #%d",
1612                     nchildren);
1613                 nchildren++;
1614                 pid = fork();
1615                 if (pid < 0)
1616                         log_err(1, "fork");
1617                 if (pid > 0) {
1618                         close(fd);
1619                         return;
1620                 }
1621         }
1622         pidfile_close(conf->conf_pidfh);
1623
1624         error = getnameinfo(client_sa, client_salen,
1625             host, sizeof(host), NULL, 0, NI_NUMERICHOST);
1626         if (error != 0)
1627                 log_errx(1, "getnameinfo: %s", gai_strerror(error));
1628
1629         log_debugx("accepted connection from %s; portal group \"%s\"",
1630             host, portal->p_portal_group->pg_name);
1631         log_set_peer_addr(host);
1632         setproctitle("%s", host);
1633
1634         conn = connection_new(portal, fd, host);
1635         set_timeout(conf);
1636         kernel_capsicate();
1637         login(conn);
1638         if (conn->conn_session_type == CONN_SESSION_TYPE_NORMAL) {
1639                 kernel_handoff(conn);
1640                 log_debugx("connection handed off to the kernel");
1641         } else {
1642                 assert(conn->conn_session_type == CONN_SESSION_TYPE_DISCOVERY);
1643                 discovery(conn);
1644         }
1645         log_debugx("nothing more to do; exiting");
1646         exit(0);
1647 }
1648
1649 static int
1650 fd_add(int fd, fd_set *fdset, int nfds)
1651 {
1652
1653         /*
1654          * Skip sockets which we failed to bind.
1655          */
1656         if (fd <= 0)
1657                 return (nfds);
1658
1659         FD_SET(fd, fdset);
1660         if (fd > nfds)
1661                 nfds = fd;
1662         return (nfds);
1663 }
1664
1665 static void
1666 main_loop(struct conf *conf, bool dont_fork)
1667 {
1668         struct portal_group *pg;
1669         struct portal *portal;
1670         struct sockaddr_storage client_sa;
1671         socklen_t client_salen;
1672 #ifdef ICL_KERNEL_PROXY
1673         int connection_id;
1674         int portal_id;
1675 #endif
1676         fd_set fdset;
1677         int error, nfds, client_fd;
1678
1679         pidfile_write(conf->conf_pidfh);
1680
1681         for (;;) {
1682                 if (sighup_received || sigterm_received)
1683                         return;
1684
1685 #ifdef ICL_KERNEL_PROXY
1686                 if (proxy_mode) {
1687                         client_salen = sizeof(client_sa);
1688                         kernel_accept(&connection_id, &portal_id,
1689                             (struct sockaddr *)&client_sa, &client_salen);
1690
1691                         log_debugx("incoming connection, id %d, portal id %d",
1692                             connection_id, portal_id);
1693                         TAILQ_FOREACH(pg, &conf->conf_portal_groups, pg_next) {
1694                                 TAILQ_FOREACH(portal, &pg->pg_portals, p_next) {
1695                                         if (portal->p_id == portal_id) {
1696                                                 goto found;
1697                                         }
1698                                 }
1699                         }
1700
1701                         log_errx(1, "kernel returned invalid portal_id %d",
1702                             portal_id);
1703
1704 found:
1705                         handle_connection(portal, connection_id,
1706                             (struct sockaddr *)&client_sa, client_salen,
1707                             dont_fork);
1708                 } else {
1709 #endif
1710                         assert(proxy_mode == false);
1711
1712                         FD_ZERO(&fdset);
1713                         nfds = 0;
1714                         TAILQ_FOREACH(pg, &conf->conf_portal_groups, pg_next) {
1715                                 TAILQ_FOREACH(portal, &pg->pg_portals, p_next)
1716                                         nfds = fd_add(portal->p_socket, &fdset, nfds);
1717                         }
1718                         error = select(nfds + 1, &fdset, NULL, NULL, NULL);
1719                         if (error <= 0) {
1720                                 if (errno == EINTR)
1721                                         return;
1722                                 log_err(1, "select");
1723                         }
1724                         TAILQ_FOREACH(pg, &conf->conf_portal_groups, pg_next) {
1725                                 TAILQ_FOREACH(portal, &pg->pg_portals, p_next) {
1726                                         if (!FD_ISSET(portal->p_socket, &fdset))
1727                                                 continue;
1728                                         client_salen = sizeof(client_sa);
1729                                         client_fd = accept(portal->p_socket,
1730                                             (struct sockaddr *)&client_sa,
1731                                             &client_salen);
1732                                         if (client_fd < 0)
1733                                                 log_err(1, "accept");
1734                                         handle_connection(portal, client_fd,
1735                                             (struct sockaddr *)&client_sa,
1736                                             client_salen, dont_fork);
1737                                         break;
1738                                 }
1739                         }
1740 #ifdef ICL_KERNEL_PROXY
1741                 }
1742 #endif
1743         }
1744 }
1745
1746 static void
1747 sighup_handler(int dummy __unused)
1748 {
1749
1750         sighup_received = true;
1751 }
1752
1753 static void
1754 sigterm_handler(int dummy __unused)
1755 {
1756
1757         sigterm_received = true;
1758 }
1759
1760 static void
1761 sigchld_handler(int dummy __unused)
1762 {
1763
1764         /*
1765          * The only purpose of this handler is to make SIGCHLD
1766          * interrupt the ISCSIDWAIT ioctl(2), so we can call
1767          * wait_for_children().
1768          */
1769 }
1770
1771 static void
1772 register_signals(void)
1773 {
1774         struct sigaction sa;
1775         int error;
1776
1777         bzero(&sa, sizeof(sa));
1778         sa.sa_handler = sighup_handler;
1779         sigfillset(&sa.sa_mask);
1780         error = sigaction(SIGHUP, &sa, NULL);
1781         if (error != 0)
1782                 log_err(1, "sigaction");
1783
1784         sa.sa_handler = sigterm_handler;
1785         error = sigaction(SIGTERM, &sa, NULL);
1786         if (error != 0)
1787                 log_err(1, "sigaction");
1788
1789         sa.sa_handler = sigterm_handler;
1790         error = sigaction(SIGINT, &sa, NULL);
1791         if (error != 0)
1792                 log_err(1, "sigaction");
1793
1794         sa.sa_handler = sigchld_handler;
1795         error = sigaction(SIGCHLD, &sa, NULL);
1796         if (error != 0)
1797                 log_err(1, "sigaction");
1798 }
1799
1800 int
1801 main(int argc, char **argv)
1802 {
1803         struct conf *oldconf, *newconf, *tmpconf;
1804         const char *config_path = DEFAULT_CONFIG_PATH;
1805         int debug = 0, ch, error;
1806         bool dont_daemonize = false;
1807
1808         while ((ch = getopt(argc, argv, "df:R")) != -1) {
1809                 switch (ch) {
1810                 case 'd':
1811                         dont_daemonize = true;
1812                         debug++;
1813                         break;
1814                 case 'f':
1815                         config_path = optarg;
1816                         break;
1817                 case 'R':
1818 #ifndef ICL_KERNEL_PROXY
1819                         log_errx(1, "ctld(8) compiled without ICL_KERNEL_PROXY "
1820                             "does not support iSER protocol");
1821 #endif
1822                         proxy_mode = true;
1823                         break;
1824                 case '?':
1825                 default:
1826                         usage();
1827                 }
1828         }
1829         argc -= optind;
1830         if (argc != 0)
1831                 usage();
1832
1833         log_init(debug);
1834         kernel_init();
1835
1836         oldconf = conf_new_from_kernel();
1837         newconf = conf_new_from_file(config_path);
1838         if (newconf == NULL)
1839                 log_errx(1, "configuration error; exiting");
1840         if (debug > 0) {
1841                 oldconf->conf_debug = debug;
1842                 newconf->conf_debug = debug;
1843         }
1844
1845         error = conf_apply(oldconf, newconf);
1846         if (error != 0)
1847                 log_errx(1, "failed to apply configuration; exiting");
1848
1849         conf_delete(oldconf);
1850         oldconf = NULL;
1851
1852         register_signals();
1853
1854         if (dont_daemonize == false) {
1855                 log_debugx("daemonizing");
1856                 if (daemon(0, 0) == -1) {
1857                         log_warn("cannot daemonize");
1858                         pidfile_remove(newconf->conf_pidfh);
1859                         exit(1);
1860                 }
1861         }
1862
1863         for (;;) {
1864                 main_loop(newconf, dont_daemonize);
1865                 if (sighup_received) {
1866                         sighup_received = false;
1867                         log_debugx("received SIGHUP, reloading configuration");
1868                         tmpconf = conf_new_from_file(config_path);
1869                         if (tmpconf == NULL) {
1870                                 log_warnx("configuration error, "
1871                                     "continuing with old configuration");
1872                         } else {
1873                                 if (debug > 0)
1874                                         tmpconf->conf_debug = debug;
1875                                 oldconf = newconf;
1876                                 newconf = tmpconf;
1877                                 error = conf_apply(oldconf, newconf);
1878                                 if (error != 0)
1879                                         log_warnx("failed to reload "
1880                                             "configuration");
1881                                 conf_delete(oldconf);
1882                                 oldconf = NULL;
1883                         }
1884                 } else if (sigterm_received) {
1885                         log_debugx("exiting on signal; "
1886                             "reloading empty configuration");
1887
1888                         log_debugx("disabling CTL iSCSI port "
1889                             "and terminating all connections");
1890
1891                         oldconf = newconf;
1892                         newconf = conf_new();
1893                         if (debug > 0)
1894                                 newconf->conf_debug = debug;
1895                         error = conf_apply(oldconf, newconf);
1896                         if (error != 0)
1897                                 log_warnx("failed to apply configuration");
1898
1899                         log_warnx("exiting on signal");
1900                         exit(0);
1901                 } else {
1902                         nchildren -= wait_for_children(false);
1903                         assert(nchildren >= 0);
1904                 }
1905         }
1906         /* NOTREACHED */
1907 }