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  */
  30
  31 #include <sys/cdefs.h>
  32 __FBSDID("$FreeBSD$");
  33
  34 #include <sys/types.h>
  35 #include <sys/time.h>
  36 #include <sys/socket.h>
  37 #include <sys/wait.h>
  38 #include <netinet/in.h>
  39 #include <arpa/inet.h>
  40 #include <assert.h>
  41 #include <ctype.h>
  42 #include <errno.h>
  43 #include <netdb.h>
  44 #include <signal.h>
  45 #include <stdbool.h>
  46 #include <stdio.h>
  47 #include <stdint.h>
  48 #include <stdlib.h>
  49 #include <string.h>
  50 #include <unistd.h>
  51
  52 #include "ctld.h"
  53 #include "isns.h"
  54
  55 bool proxy_mode = false;
  56
  57 static volatile bool sighup_received = false;
  58 static volatile bool sigterm_received = false;
  59 static volatile bool sigalrm_received = false;
  60
  61 static int nchildren = 0;
  62 static uint16_t last_portal_group_tag = 0;
  63
  64 static void
  65 usage(void)
  66 {
  67
  68         fprintf(stderr, "usage: ctld [-d][-f config-file]\n");
  69         exit(1);
  70 }
  71
  72 char *
  73 checked_strdup(const char *s)
  74 {
  75         char *c;
  76
  77         c = strdup(s);
  78         if (c == NULL)
  79                 log_err(1, "strdup");
  80         return (c);
  81 }
  82
  83 struct conf *
  84 conf_new(void)
  85 {
  86         struct conf *conf;
  87
  88         conf = calloc(1, sizeof(*conf));
  89         if (conf == NULL)
  90                 log_err(1, "calloc");
  91         TAILQ_INIT(&conf->conf_luns);
  92         TAILQ_INIT(&conf->conf_targets);
  93         TAILQ_INIT(&conf->conf_auth_groups);
  94         TAILQ_INIT(&conf->conf_ports);
  95         TAILQ_INIT(&conf->conf_portal_groups);
  96         TAILQ_INIT(&conf->conf_pports);
  97         TAILQ_INIT(&conf->conf_isns);
  98
  99         conf->conf_isns_period = 900;
 100         conf->conf_isns_timeout = 5;
 101         conf->conf_debug = 0;
 102         conf->conf_timeout = 60;
 103         conf->conf_maxproc = 30;
 104
 105         return (conf);
 106 }
 107
 108 void
 109 conf_delete(struct conf *conf)
 110 {
 111         struct lun *lun, *ltmp;
 112         struct target *targ, *tmp;
 113         struct auth_group *ag, *cagtmp;
 114         struct portal_group *pg, *cpgtmp;
 115         struct pport *pp, *pptmp;
 116         struct isns *is, *istmp;
 117
 118         assert(conf->conf_pidfh == NULL);
 119
 120         TAILQ_FOREACH_SAFE(lun, &conf->conf_luns, l_next, ltmp)
 121                 lun_delete(lun);
 122         TAILQ_FOREACH_SAFE(targ, &conf->conf_targets, t_next, tmp)
 123                 target_delete(targ);
 124         TAILQ_FOREACH_SAFE(ag, &conf->conf_auth_groups, ag_next, cagtmp)
 125                 auth_group_delete(ag);
 126         TAILQ_FOREACH_SAFE(pg, &conf->conf_portal_groups, pg_next, cpgtmp)
 127                 portal_group_delete(pg);
 128         TAILQ_FOREACH_SAFE(pp, &conf->conf_pports, pp_next, pptmp)
 129                 pport_delete(pp);
 130         TAILQ_FOREACH_SAFE(is, &conf->conf_isns, i_next, istmp)
 131                 isns_delete(is);
 132         assert(TAILQ_EMPTY(&conf->conf_ports));
 133         free(conf->conf_pidfile_path);
 134         free(conf);
 135 }
 136
 137 static struct auth *
 138 auth_new(struct auth_group *ag)
 139 {
 140         struct auth *auth;
 141
 142         auth = calloc(1, sizeof(*auth));
 143         if (auth == NULL)
 144                 log_err(1, "calloc");
 145         auth->a_auth_group = ag;
 146         TAILQ_INSERT_TAIL(&ag->ag_auths, auth, a_next);
 147         return (auth);
 148 }
 149
 150 static void
 151 auth_delete(struct auth *auth)
 152 {
 153         TAILQ_REMOVE(&auth->a_auth_group->ag_auths, auth, a_next);
 154
 155         free(auth->a_user);
 156         free(auth->a_secret);
 157         free(auth->a_mutual_user);
 158         free(auth->a_mutual_secret);
 159         free(auth);
 160 }
 161
 162 const struct auth *
 163 auth_find(const struct auth_group *ag, const char *user)
 164 {
 165         const struct auth *auth;
 166
 167         TAILQ_FOREACH(auth, &ag->ag_auths, a_next) {
 168                 if (strcmp(auth->a_user, user) == 0)
 169                         return (auth);
 170         }
 171
 172         return (NULL);
 173 }
 174
 175 static void
 176 auth_check_secret_length(struct auth *auth)
 177 {
 178         size_t len;
 179
 180         len = strlen(auth->a_secret);
 181         if (len > 16) {
 182                 if (auth->a_auth_group->ag_name != NULL)
 183                         log_warnx("secret for user \"%s\", auth-group \"%s\", "
 184                             "is too long; it should be at most 16 characters "
 185                             "long", auth->a_user, auth->a_auth_group->ag_name);
 186                 else
 187                         log_warnx("secret for user \"%s\", target \"%s\", "
 188                             "is too long; it should be at most 16 characters "
 189                             "long", auth->a_user,
 190                             auth->a_auth_group->ag_target->t_name);
 191         }
 192         if (len < 12) {
 193                 if (auth->a_auth_group->ag_name != NULL)
 194                         log_warnx("secret for user \"%s\", auth-group \"%s\", "
 195                             "is too short; it should be at least 12 characters "
 196                             "long", auth->a_user,
 197                             auth->a_auth_group->ag_name);
 198                 else
 199                         log_warnx("secret for user \"%s\", target \"%s\", "
 200                             "is too short; it should be at least 16 characters "
 201                             "long", auth->a_user,
 202                             auth->a_auth_group->ag_target->t_name);
 203         }
 204
 205         if (auth->a_mutual_secret != NULL) {
 206                 len = strlen(auth->a_secret);
 207                 if (len > 16) {
 208                         if (auth->a_auth_group->ag_name != NULL)
 209                                 log_warnx("mutual secret for user \"%s\", "
 210                                     "auth-group \"%s\", is too long; it should "
 211                                     "be at most 16 characters long",
 212                                     auth->a_user, auth->a_auth_group->ag_name);
 213                         else
 214                                 log_warnx("mutual secret for user \"%s\", "
 215                                     "target \"%s\", is too long; it should "
 216                                     "be at most 16 characters long",
 217                                     auth->a_user,
 218                                     auth->a_auth_group->ag_target->t_name);
 219                 }
 220                 if (len < 12) {
 221                         if (auth->a_auth_group->ag_name != NULL)
 222                                 log_warnx("mutual secret for user \"%s\", "
 223                                     "auth-group \"%s\", is too short; it "
 224                                     "should be at least 12 characters long",
 225                                     auth->a_user, auth->a_auth_group->ag_name);
 226                         else
 227                                 log_warnx("mutual secret for user \"%s\", "
 228                                     "target \"%s\", is too short; it should be "
 229                                     "at least 16 characters long",
 230                                     auth->a_user,
 231                                     auth->a_auth_group->ag_target->t_name);
 232                 }
 233         }
 234 }
 235
 236 const struct auth *
 237 auth_new_chap(struct auth_group *ag, const char *user,
 238     const char *secret)
 239 {
 240         struct auth *auth;
 241
 242         if (ag->ag_type == AG_TYPE_UNKNOWN)
 243                 ag->ag_type = AG_TYPE_CHAP;
 244         if (ag->ag_type != AG_TYPE_CHAP) {
 245                 if (ag->ag_name != NULL)
 246                         log_warnx("cannot mix \"chap\" authentication with "
 247                             "other types for auth-group \"%s\"", ag->ag_name);
 248                 else
 249                         log_warnx("cannot mix \"chap\" authentication with "
 250                             "other types for target \"%s\"",
 251                             ag->ag_target->t_name);
 252                 return (NULL);
 253         }
 254
 255         auth = auth_new(ag);
 256         auth->a_user = checked_strdup(user);
 257         auth->a_secret = checked_strdup(secret);
 258
 259         auth_check_secret_length(auth);
 260
 261         return (auth);
 262 }
 263
 264 const struct auth *
 265 auth_new_chap_mutual(struct auth_group *ag, const char *user,
 266     const char *secret, const char *user2, const char *secret2)
 267 {
 268         struct auth *auth;
 269
 270         if (ag->ag_type == AG_TYPE_UNKNOWN)
 271                 ag->ag_type = AG_TYPE_CHAP_MUTUAL;
 272         if (ag->ag_type != AG_TYPE_CHAP_MUTUAL) {
 273                 if (ag->ag_name != NULL)
 274                         log_warnx("cannot mix \"chap-mutual\" authentication "
 275                             "with other types for auth-group \"%s\"",
 276                             ag->ag_name);
 277                 else
 278                         log_warnx("cannot mix \"chap-mutual\" authentication "
 279                             "with other types for target \"%s\"",
 280                             ag->ag_target->t_name);
 281                 return (NULL);
 282         }
 283
 284         auth = auth_new(ag);
 285         auth->a_user = checked_strdup(user);
 286         auth->a_secret = checked_strdup(secret);
 287         auth->a_mutual_user = checked_strdup(user2);
 288         auth->a_mutual_secret = checked_strdup(secret2);
 289
 290         auth_check_secret_length(auth);
 291
 292         return (auth);
 293 }
 294
 295 const struct auth_name *
 296 auth_name_new(struct auth_group *ag, const char *name)
 297 {
 298         struct auth_name *an;
 299
 300         an = calloc(1, sizeof(*an));
 301         if (an == NULL)
 302                 log_err(1, "calloc");
 303         an->an_auth_group = ag;
 304         an->an_initator_name = checked_strdup(name);
 305         TAILQ_INSERT_TAIL(&ag->ag_names, an, an_next);
 306         return (an);
 307 }
 308
 309 static void
 310 auth_name_delete(struct auth_name *an)
 311 {
 312         TAILQ_REMOVE(&an->an_auth_group->ag_names, an, an_next);
 313
 314         free(an->an_initator_name);
 315         free(an);
 316 }
 317
 318 bool
 319 auth_name_defined(const struct auth_group *ag)
 320 {
 321         if (TAILQ_EMPTY(&ag->ag_names))
 322                 return (false);
 323         return (true);
 324 }
 325
 326 const struct auth_name *
 327 auth_name_find(const struct auth_group *ag, const char *name)
 328 {
 329         const struct auth_name *auth_name;
 330
 331         TAILQ_FOREACH(auth_name, &ag->ag_names, an_next) {
 332                 if (strcmp(auth_name->an_initator_name, name) == 0)
 333                         return (auth_name);
 334         }
 335
 336         return (NULL);
 337 }
 338
 339 int
 340 auth_name_check(const struct auth_group *ag, const char *initiator_name)
 341 {
 342         if (!auth_name_defined(ag))
 343                 return (0);
 344
 345         if (auth_name_find(ag, initiator_name) == NULL)
 346                 return (1);
 347
 348         return (0);
 349 }
 350
 351 const struct auth_portal *
 352 auth_portal_new(struct auth_group *ag, const char *portal)
 353 {
 354         struct auth_portal *ap;
 355         char *net, *mask, *str, *tmp;
 356         int len, dm, m;
 357
 358         ap = calloc(1, sizeof(*ap));
 359         if (ap == NULL)
 360                 log_err(1, "calloc");
 361         ap->ap_auth_group = ag;
 362         ap->ap_initator_portal = checked_strdup(portal);
 363         mask = str = checked_strdup(portal);
 364         net = strsep(&mask, "/");
 365         if (net[0] == '[')
 366                 net++;
 367         len = strlen(net);
 368         if (len == 0)
 369                 goto error;
 370         if (net[len - 1] == ']')
 371                 net[len - 1] = 0;
 372         if (strchr(net, ':') != NULL) {
 373                 struct sockaddr_in6 *sin6 =
 374                     (struct sockaddr_in6 *)&ap->ap_sa;
 375
 376                 sin6->sin6_len = sizeof(*sin6);
 377                 sin6->sin6_family = AF_INET6;
 378                 if (inet_pton(AF_INET6, net, &sin6->sin6_addr) <= 0)
 379                         goto error;
 380                 dm = 128;
 381         } else {
 382                 struct sockaddr_in *sin =
 383                     (struct sockaddr_in *)&ap->ap_sa;
 384
 385                 sin->sin_len = sizeof(*sin);
 386                 sin->sin_family = AF_INET;
 387                 if (inet_pton(AF_INET, net, &sin->sin_addr) <= 0)
 388                         goto error;
 389                 dm = 32;
 390         }
 391         if (mask != NULL) {
 392                 m = strtol(mask, &tmp, 0);
 393                 if (m < 0 || m > dm || tmp[0] != 0)
 394                         goto error;
 395         } else
 396                 m = dm;
 397         ap->ap_mask = m;
 398         free(str);
 399         TAILQ_INSERT_TAIL(&ag->ag_portals, ap, ap_next);
 400         return (ap);
 401
 402 error:
 403         log_errx(1, "Incorrect initiator portal '%s'", portal);
 404         return (NULL);
 405 }
 406
 407 static void
 408 auth_portal_delete(struct auth_portal *ap)
 409 {
 410         TAILQ_REMOVE(&ap->ap_auth_group->ag_portals, ap, ap_next);
 411
 412         free(ap->ap_initator_portal);
 413         free(ap);
 414 }
 415
 416 bool
 417 auth_portal_defined(const struct auth_group *ag)
 418 {
 419         if (TAILQ_EMPTY(&ag->ag_portals))
 420                 return (false);
 421         return (true);
 422 }
 423
 424 const struct auth_portal *
 425 auth_portal_find(const struct auth_group *ag, const struct sockaddr_storage *ss)
 426 {
 427         const struct auth_portal *ap;
 428         const uint8_t *a, *b;
 429         int i;
 430         uint8_t bmask;
 431
 432         TAILQ_FOREACH(ap, &ag->ag_portals, ap_next) {
 433                 if (ap->ap_sa.ss_family != ss->ss_family)
 434                         continue;
 435                 if (ss->ss_family == AF_INET) {
 436                         a = (const uint8_t *)
 437                             &((const struct sockaddr_in *)ss)->sin_addr;
 438                         b = (const uint8_t *)
 439                             &((const struct sockaddr_in *)&ap->ap_sa)->sin_addr;
 440                 } else {
 441                         a = (const uint8_t *)
 442                             &((const struct sockaddr_in6 *)ss)->sin6_addr;
 443                         b = (const uint8_t *)
 444                             &((const struct sockaddr_in6 *)&ap->ap_sa)->sin6_addr;
 445                 }
 446                 for (i = 0; i < ap->ap_mask / 8; i++) {
 447                         if (a[i] != b[i])
 448                                 goto next;
 449                 }
 450                 if (ap->ap_mask % 8) {
 451                         bmask = 0xff << (8 - (ap->ap_mask % 8));
 452                         if ((a[i] & bmask) != (b[i] & bmask))
 453                                 goto next;
 454                 }
 455                 return (ap);
 456 next:
 457                 ;
 458         }
 459
 460         return (NULL);
 461 }
 462
 463 int
 464 auth_portal_check(const struct auth_group *ag, const struct sockaddr_storage *sa)
 465 {
 466
 467         if (!auth_portal_defined(ag))
 468                 return (0);
 469
 470         if (auth_portal_find(ag, sa) == NULL)
 471                 return (1);
 472
 473         return (0);
 474 }
 475
 476 struct auth_group *
 477 auth_group_new(struct conf *conf, const char *name)
 478 {
 479         struct auth_group *ag;
 480
 481         if (name != NULL) {
 482                 ag = auth_group_find(conf, name);
 483                 if (ag != NULL) {
 484                         log_warnx("duplicated auth-group \"%s\"", name);
 485                         return (NULL);
 486                 }
 487         }
 488
 489         ag = calloc(1, sizeof(*ag));
 490         if (ag == NULL)
 491                 log_err(1, "calloc");
 492         if (name != NULL)
 493                 ag->ag_name = checked_strdup(name);
 494         TAILQ_INIT(&ag->ag_auths);
 495         TAILQ_INIT(&ag->ag_names);
 496         TAILQ_INIT(&ag->ag_portals);
 497         ag->ag_conf = conf;
 498         TAILQ_INSERT_TAIL(&conf->conf_auth_groups, ag, ag_next);
 499
 500         return (ag);
 501 }
 502
 503 void
 504 auth_group_delete(struct auth_group *ag)
 505 {
 506         struct auth *auth, *auth_tmp;
 507         struct auth_name *auth_name, *auth_name_tmp;
 508         struct auth_portal *auth_portal, *auth_portal_tmp;
 509
 510         TAILQ_REMOVE(&ag->ag_conf->conf_auth_groups, ag, ag_next);
 511
 512         TAILQ_FOREACH_SAFE(auth, &ag->ag_auths, a_next, auth_tmp)
 513                 auth_delete(auth);
 514         TAILQ_FOREACH_SAFE(auth_name, &ag->ag_names, an_next, auth_name_tmp)
 515                 auth_name_delete(auth_name);
 516         TAILQ_FOREACH_SAFE(auth_portal, &ag->ag_portals, ap_next,
 517             auth_portal_tmp)
 518                 auth_portal_delete(auth_portal);
 519         free(ag->ag_name);
 520         free(ag);
 521 }
 522
 523 struct auth_group *
 524 auth_group_find(const struct conf *conf, const char *name)
 525 {
 526         struct auth_group *ag;
 527
 528         TAILQ_FOREACH(ag, &conf->conf_auth_groups, ag_next) {
 529                 if (ag->ag_name != NULL && strcmp(ag->ag_name, name) == 0)
 530                         return (ag);
 531         }
 532
 533         return (NULL);
 534 }
 535
 536 int
 537 auth_group_set_type(struct auth_group *ag, const char *str)
 538 {
 539         int type;
 540
 541         if (strcmp(str, "none") == 0) {
 542                 type = AG_TYPE_NO_AUTHENTICATION;
 543         } else if (strcmp(str, "deny") == 0) {
 544                 type = AG_TYPE_DENY;
 545         } else if (strcmp(str, "chap") == 0) {
 546                 type = AG_TYPE_CHAP;
 547         } else if (strcmp(str, "chap-mutual") == 0) {
 548                 type = AG_TYPE_CHAP_MUTUAL;
 549         } else {
 550                 if (ag->ag_name != NULL)
 551                         log_warnx("invalid auth-type \"%s\" for auth-group "
 552                             "\"%s\"", str, ag->ag_name);
 553                 else
 554                         log_warnx("invalid auth-type \"%s\" for target "
 555                             "\"%s\"", str, ag->ag_target->t_name);
 556                 return (1);
 557         }
 558
 559         if (ag->ag_type != AG_TYPE_UNKNOWN && ag->ag_type != type) {
 560                 if (ag->ag_name != NULL) {
 561                         log_warnx("cannot set auth-type to \"%s\" for "
 562                             "auth-group \"%s\"; already has a different "
 563                             "type", str, ag->ag_name);
 564                 } else {
 565                         log_warnx("cannot set auth-type to \"%s\" for target "
 566                             "\"%s\"; already has a different type",
 567                             str, ag->ag_target->t_name);
 568                 }
 569                 return (1);
 570         }
 571
 572         ag->ag_type = type;
 573
 574         return (0);
 575 }
 576
 577 static struct portal *
 578 portal_new(struct portal_group *pg)
 579 {
 580         struct portal *portal;
 581
 582         portal = calloc(1, sizeof(*portal));
 583         if (portal == NULL)
 584                 log_err(1, "calloc");
 585         TAILQ_INIT(&portal->p_targets);
 586         portal->p_portal_group = pg;
 587         TAILQ_INSERT_TAIL(&pg->pg_portals, portal, p_next);
 588         return (portal);
 589 }
 590
 591 static void
 592 portal_delete(struct portal *portal)
 593 {
 594
 595         TAILQ_REMOVE(&portal->p_portal_group->pg_portals, portal, p_next);
 596         if (portal->p_ai != NULL)
 597                 freeaddrinfo(portal->p_ai);
 598         free(portal->p_listen);
 599         free(portal);
 600 }
 601
 602 struct portal_group *
 603 portal_group_new(struct conf *conf, const char *name)
 604 {
 605         struct portal_group *pg;
 606
 607         pg = portal_group_find(conf, name);
 608         if (pg != NULL) {
 609                 log_warnx("duplicated portal-group \"%s\"", name);
 610                 return (NULL);
 611         }
 612
 613         pg = calloc(1, sizeof(*pg));
 614         if (pg == NULL)
 615                 log_err(1, "calloc");
 616         pg->pg_name = checked_strdup(name);
 617         TAILQ_INIT(&pg->pg_portals);
 618         TAILQ_INIT(&pg->pg_ports);
 619         pg->pg_conf = conf;
 620         pg->pg_tag = 0;         /* Assigned later in conf_apply(). */
 621         TAILQ_INSERT_TAIL(&conf->conf_portal_groups, pg, pg_next);
 622
 623         return (pg);
 624 }
 625
 626 void
 627 portal_group_delete(struct portal_group *pg)
 628 {
 629         struct portal *portal, *tmp;
 630         struct port *port, *tport;
 631
 632         TAILQ_FOREACH_SAFE(port, &pg->pg_ports, p_pgs, tport)
 633                 port_delete(port);
 634         TAILQ_REMOVE(&pg->pg_conf->conf_portal_groups, pg, pg_next);
 635
 636         TAILQ_FOREACH_SAFE(portal, &pg->pg_portals, p_next, tmp)
 637                 portal_delete(portal);
 638         free(pg->pg_name);
 639         free(pg->pg_redirection);
 640         free(pg);
 641 }
 642
 643 struct portal_group *
 644 portal_group_find(const struct conf *conf, const char *name)
 645 {
 646         struct portal_group *pg;
 647
 648         TAILQ_FOREACH(pg, &conf->conf_portal_groups, pg_next) {
 649                 if (strcmp(pg->pg_name, name) == 0)
 650                         return (pg);
 651         }
 652
 653         return (NULL);
 654 }
 655
 656 static int
 657 parse_addr_port(char *arg, const char *def_port, struct addrinfo **ai)
 658 {
 659         struct addrinfo hints;
 660         char *str, *addr, *ch;
 661         const char *port;
 662         int error, colons = 0;
 663
 664         str = arg = strdup(arg);
 665         if (arg[0] == '[') {
 666                 /*
 667                  * IPv6 address in square brackets, perhaps with port.
 668                  */
 669                 arg++;
 670                 addr = strsep(&arg, "]");
 671                 if (arg == NULL)
 672                         return (1);
 673                 if (arg[0] == '\0') {
 674                         port = def_port;
 675                 } else if (arg[0] == ':') {
 676                         port = arg + 1;
 677                 } else {
 678                         free(str);
 679                         return (1);
 680                 }
 681         } else {
 682                 /*
 683                  * Either IPv6 address without brackets - and without
 684                  * a port - or IPv4 address.  Just count the colons.
 685                  */
 686                 for (ch = arg; *ch != '\0'; ch++) {
 687                         if (*ch == ':')
 688                                 colons++;
 689                 }
 690                 if (colons > 1) {
 691                         addr = arg;
 692                         port = def_port;
 693                 } else {
 694                         addr = strsep(&arg, ":");
 695                         if (arg == NULL)
 696                                 port = def_port;
 697                         else
 698                                 port = arg;
 699                 }
 700         }
 701
 702         memset(&hints, 0, sizeof(hints));
 703         hints.ai_family = PF_UNSPEC;
 704         hints.ai_socktype = SOCK_STREAM;
 705         hints.ai_flags = AI_PASSIVE;
 706         error = getaddrinfo(addr, port, &hints, ai);
 707         free(str);
 708         return ((error != 0) ? 1 : 0);
 709 }
 710
 711 int
 712 portal_group_add_listen(struct portal_group *pg, const char *value, bool iser)
 713 {
 714         struct portal *portal;
 715
 716         portal = portal_new(pg);
 717         portal->p_listen = checked_strdup(value);
 718         portal->p_iser = iser;
 719
 720         if (parse_addr_port(portal->p_listen, "3260", &portal->p_ai)) {
 721                 log_warnx("invalid listen address %s", portal->p_listen);
 722                 portal_delete(portal);
 723                 return (1);
 724         }
 725
 726         /*
 727          * XXX: getaddrinfo(3) may return multiple addresses; we should turn
 728          *      those into multiple portals.
 729          */
 730
 731         return (0);
 732 }
 733
 734 int
 735 isns_new(struct conf *conf, const char *addr)
 736 {
 737         struct isns *isns;
 738
 739         isns = calloc(1, sizeof(*isns));
 740         if (isns == NULL)
 741                 log_err(1, "calloc");
 742         isns->i_conf = conf;
 743         TAILQ_INSERT_TAIL(&conf->conf_isns, isns, i_next);
 744         isns->i_addr = checked_strdup(addr);
 745
 746         if (parse_addr_port(isns->i_addr, "3205", &isns->i_ai)) {
 747                 log_warnx("invalid iSNS address %s", isns->i_addr);
 748                 isns_delete(isns);
 749                 return (1);
 750         }
 751
 752         /*
 753          * XXX: getaddrinfo(3) may return multiple addresses; we should turn
 754          *      those into multiple servers.
 755          */
 756
 757         return (0);
 758 }
 759
 760 void
 761 isns_delete(struct isns *isns)
 762 {
 763
 764         TAILQ_REMOVE(&isns->i_conf->conf_isns, isns, i_next);
 765         free(isns->i_addr);
 766         if (isns->i_ai != NULL)
 767                 freeaddrinfo(isns->i_ai);
 768         free(isns);
 769 }
 770
 771 static int
 772 isns_do_connect(struct isns *isns)
 773 {
 774         int s;
 775
 776         s = socket(isns->i_ai->ai_family, isns->i_ai->ai_socktype,
 777             isns->i_ai->ai_protocol);
 778         if (s < 0) {
 779                 log_warn("socket(2) failed for %s", isns->i_addr);
 780                 return (-1);
 781         }
 782         if (connect(s, isns->i_ai->ai_addr, isns->i_ai->ai_addrlen)) {
 783                 log_warn("connect(2) failed for %s", isns->i_addr);
 784                 close(s);
 785                 return (-1);
 786         }
 787         return(s);
 788 }
 789
 790 static int
 791 isns_do_register(struct isns *isns, int s, const char *hostname)
 792 {
 793         struct conf *conf = isns->i_conf;
 794         struct target *target;
 795         struct portal *portal;
 796         struct portal_group *pg;
 797         struct port *port;
 798         struct isns_req *req;
 799         int res = 0;
 800         uint32_t error;
 801
 802         req = isns_req_create(ISNS_FUNC_DEVATTRREG, ISNS_FLAG_CLIENT);
 803         isns_req_add_str(req, 32, TAILQ_FIRST(&conf->conf_targets)->t_name);
 804         isns_req_add_delim(req);
 805         isns_req_add_str(req, 1, hostname);
 806         isns_req_add_32(req, 2, 2); /* 2 -- iSCSI */
 807         isns_req_add_32(req, 6, conf->conf_isns_period);
 808         TAILQ_FOREACH(pg, &conf->conf_portal_groups, pg_next) {
 809                 if (pg->pg_unassigned)
 810                         continue;
 811                 TAILQ_FOREACH(portal, &pg->pg_portals, p_next) {
 812                         isns_req_add_addr(req, 16, portal->p_ai);
 813                         isns_req_add_port(req, 17, portal->p_ai);
 814                 }
 815         }
 816         TAILQ_FOREACH(target, &conf->conf_targets, t_next) {
 817                 isns_req_add_str(req, 32, target->t_name);
 818                 isns_req_add_32(req, 33, 1); /* 1 -- Target*/
 819                 if (target->t_alias != NULL)
 820                         isns_req_add_str(req, 34, target->t_alias);
 821                 TAILQ_FOREACH(port, &target->t_ports, p_ts) {
 822                         if ((pg = port->p_portal_group) == NULL)
 823                                 continue;
 824                         isns_req_add_32(req, 51, pg->pg_tag);
 825                         TAILQ_FOREACH(portal, &pg->pg_portals, p_next) {
 826                                 isns_req_add_addr(req, 49, portal->p_ai);
 827                                 isns_req_add_port(req, 50, portal->p_ai);
 828                         }
 829                 }
 830         }
 831         res = isns_req_send(s, req);
 832         if (res < 0) {
 833                 log_warn("send(2) failed for %s", isns->i_addr);
 834                 goto quit;
 835         }
 836         res = isns_req_receive(s, req);
 837         if (res < 0) {
 838                 log_warn("receive(2) failed for %s", isns->i_addr);
 839                 goto quit;
 840         }
 841         error = isns_req_get_status(req);
 842         if (error != 0) {
 843                 log_warnx("iSNS register error %d for %s", error, isns->i_addr);
 844                 res = -1;
 845         }
 846 quit:
 847         isns_req_free(req);
 848         return (res);
 849 }
 850
 851 static int
 852 isns_do_check(struct isns *isns, int s, const char *hostname)
 853 {
 854         struct conf *conf = isns->i_conf;
 855         struct isns_req *req;
 856         int res = 0;
 857         uint32_t error;
 858
 859         req = isns_req_create(ISNS_FUNC_DEVATTRQRY, ISNS_FLAG_CLIENT);
 860         isns_req_add_str(req, 32, TAILQ_FIRST(&conf->conf_targets)->t_name);
 861         isns_req_add_str(req, 1, hostname);
 862         isns_req_add_delim(req);
 863         isns_req_add(req, 2, 0, NULL);
 864         res = isns_req_send(s, req);
 865         if (res < 0) {
 866                 log_warn("send(2) failed for %s", isns->i_addr);
 867                 goto quit;
 868         }
 869         res = isns_req_receive(s, req);
 870         if (res < 0) {
 871                 log_warn("receive(2) failed for %s", isns->i_addr);
 872                 goto quit;
 873         }
 874         error = isns_req_get_status(req);
 875         if (error != 0) {
 876                 log_warnx("iSNS check error %d for %s", error, isns->i_addr);
 877                 res = -1;
 878         }
 879 quit:
 880         isns_req_free(req);
 881         return (res);
 882 }
 883
 884 static int
 885 isns_do_deregister(struct isns *isns, int s, const char *hostname)
 886 {
 887         struct conf *conf = isns->i_conf;
 888         struct isns_req *req;
 889         int res = 0;
 890         uint32_t error;
 891
 892         req = isns_req_create(ISNS_FUNC_DEVDEREG, ISNS_FLAG_CLIENT);
 893         isns_req_add_str(req, 32, TAILQ_FIRST(&conf->conf_targets)->t_name);
 894         isns_req_add_delim(req);
 895         isns_req_add_str(req, 1, hostname);
 896         res = isns_req_send(s, req);
 897         if (res < 0) {
 898                 log_warn("send(2) failed for %s", isns->i_addr);
 899                 goto quit;
 900         }
 901         res = isns_req_receive(s, req);
 902         if (res < 0) {
 903                 log_warn("receive(2) failed for %s", isns->i_addr);
 904                 goto quit;
 905         }
 906         error = isns_req_get_status(req);
 907         if (error != 0) {
 908                 log_warnx("iSNS deregister error %d for %s", error, isns->i_addr);
 909                 res = -1;
 910         }
 911 quit:
 912         isns_req_free(req);
 913         return (res);
 914 }
 915
 916 void
 917 isns_register(struct isns *isns, struct isns *oldisns)
 918 {
 919         struct conf *conf = isns->i_conf;
 920         int s;
 921         char hostname[256];
 922
 923         if (TAILQ_EMPTY(&conf->conf_targets) ||
 924             TAILQ_EMPTY(&conf->conf_portal_groups))
 925                 return;
 926         set_timeout(conf->conf_isns_timeout, false);
 927         s = isns_do_connect(isns);
 928         if (s < 0) {
 929                 set_timeout(0, false);
 930                 return;
 931         }
 932         gethostname(hostname, sizeof(hostname));
 933
 934         if (oldisns == NULL || TAILQ_EMPTY(&oldisns->i_conf->conf_targets))
 935                 oldisns = isns;
 936         isns_do_deregister(oldisns, s, hostname);
 937         isns_do_register(isns, s, hostname);
 938         close(s);
 939         set_timeout(0, false);
 940 }
 941
 942 void
 943 isns_check(struct isns *isns)
 944 {
 945         struct conf *conf = isns->i_conf;
 946         int s, res;
 947         char hostname[256];
 948
 949         if (TAILQ_EMPTY(&conf->conf_targets) ||
 950             TAILQ_EMPTY(&conf->conf_portal_groups))
 951                 return;
 952         set_timeout(conf->conf_isns_timeout, false);
 953         s = isns_do_connect(isns);
 954         if (s < 0) {
 955                 set_timeout(0, false);
 956                 return;
 957         }
 958         gethostname(hostname, sizeof(hostname));
 959
 960         res = isns_do_check(isns, s, hostname);
 961         if (res < 0) {
 962                 isns_do_deregister(isns, s, hostname);
 963                 isns_do_register(isns, s, hostname);
 964         }
 965         close(s);
 966         set_timeout(0, false);
 967 }
 968
 969 void
 970 isns_deregister(struct isns *isns)
 971 {
 972         struct conf *conf = isns->i_conf;
 973         int s;
 974         char hostname[256];
 975
 976         if (TAILQ_EMPTY(&conf->conf_targets) ||
 977             TAILQ_EMPTY(&conf->conf_portal_groups))
 978                 return;
 979         set_timeout(conf->conf_isns_timeout, false);
 980         s = isns_do_connect(isns);
 981         if (s < 0)
 982                 return;
 983         gethostname(hostname, sizeof(hostname));
 984
 985         isns_do_deregister(isns, s, hostname);
 986         close(s);
 987         set_timeout(0, false);
 988 }
 989
 990 int
 991 portal_group_set_filter(struct portal_group *pg, const char *str)
 992 {
 993         int filter;
 994
 995         if (strcmp(str, "none") == 0) {
 996                 filter = PG_FILTER_NONE;
 997         } else if (strcmp(str, "portal") == 0) {
 998                 filter = PG_FILTER_PORTAL;
 999         } else if (strcmp(str, "portal-name") == 0) {
1000                 filter = PG_FILTER_PORTAL_NAME;
1001         } else if (strcmp(str, "portal-name-auth") == 0) {
1002                 filter = PG_FILTER_PORTAL_NAME_AUTH;
1003         } else {
1004                 log_warnx("invalid discovery-filter \"%s\" for portal-group "
1005                     "\"%s\"; valid values are \"none\", \"portal\", "
1006                     "\"portal-name\", and \"portal-name-auth\"",
1007                     str, pg->pg_name);
1008                 return (1);
1009         }
1010
1011         if (pg->pg_discovery_filter != PG_FILTER_UNKNOWN &&
1012             pg->pg_discovery_filter != filter) {
1013                 log_warnx("cannot set discovery-filter to \"%s\" for "
1014                     "portal-group \"%s\"; already has a different "
1015                     "value", str, pg->pg_name);
1016                 return (1);
1017         }
1018
1019         pg->pg_discovery_filter = filter;
1020
1021         return (0);
1022 }
1023
1024 int
1025 portal_group_set_redirection(struct portal_group *pg, const char *addr)
1026 {
1027
1028         if (pg->pg_redirection != NULL) {
1029                 log_warnx("cannot set redirection to \"%s\" for "
1030                     "portal-group \"%s\"; already defined",
1031                     addr, pg->pg_name);
1032                 return (1);
1033         }
1034
1035         pg->pg_redirection = checked_strdup(addr);
1036
1037         return (0);
1038 }
1039
1040 static bool
1041 valid_hex(const char ch)
1042 {
1043         switch (ch) {
1044         case '0':
1045         case '1':
1046         case '2':
1047         case '3':
1048         case '4':
1049         case '5':
1050         case '6':
1051         case '7':
1052         case '8':
1053         case '9':
1054         case 'a':
1055         case 'A':
1056         case 'b':
1057         case 'B':
1058         case 'c':
1059         case 'C':
1060         case 'd':
1061         case 'D':
1062         case 'e':
1063         case 'E':
1064         case 'f':
1065         case 'F':
1066                 return (true);
1067         default:
1068                 return (false);
1069         }
1070 }
1071
1072 bool
1073 valid_iscsi_name(const char *name)
1074 {
1075         int i;
1076
1077         if (strlen(name) >= MAX_NAME_LEN) {
1078                 log_warnx("overlong name for target \"%s\"; max length allowed "
1079                     "by iSCSI specification is %d characters",
1080                     name, MAX_NAME_LEN);
1081                 return (false);
1082         }
1083
1084         /*
1085          * In the cases below, we don't return an error, just in case the admin
1086          * was right, and we're wrong.
1087          */
1088         if (strncasecmp(name, "iqn.", strlen("iqn.")) == 0) {
1089                 for (i = strlen("iqn."); name[i] != '\0'; i++) {
1090                         /*
1091                          * XXX: We should verify UTF-8 normalisation, as defined
1092                          *      by 3.2.6.2: iSCSI Name Encoding.
1093                          */
1094                         if (isalnum(name[i]))
1095                                 continue;
1096                         if (name[i] == '-' || name[i] == '.' || name[i] == ':')
1097                                 continue;
1098                         log_warnx("invalid character \"%c\" in target name "
1099                             "\"%s\"; allowed characters are letters, digits, "
1100                             "'-', '.', and ':'", name[i], name);
1101                         break;
1102                 }
1103                 /*
1104                  * XXX: Check more stuff: valid date and a valid reversed domain.
1105                  */
1106         } else if (strncasecmp(name, "eui.", strlen("eui.")) == 0) {
1107                 if (strlen(name) != strlen("eui.") + 16)
1108                         log_warnx("invalid target name \"%s\"; the \"eui.\" "
1109                             "should be followed by exactly 16 hexadecimal "
1110                             "digits", name);
1111                 for (i = strlen("eui."); name[i] != '\0'; i++) {
1112                         if (!valid_hex(name[i])) {
1113                                 log_warnx("invalid character \"%c\" in target "
1114                                     "name \"%s\"; allowed characters are 1-9 "
1115                                     "and A-F", name[i], name);
1116                                 break;
1117                         }
1118                 }
1119         } else if (strncasecmp(name, "naa.", strlen("naa.")) == 0) {
1120                 if (strlen(name) > strlen("naa.") + 32)
1121                         log_warnx("invalid target name \"%s\"; the \"naa.\" "
1122                             "should be followed by at most 32 hexadecimal "
1123                             "digits", name);
1124                 for (i = strlen("naa."); name[i] != '\0'; i++) {
1125                         if (!valid_hex(name[i])) {
1126                                 log_warnx("invalid character \"%c\" in target "
1127                                     "name \"%s\"; allowed characters are 1-9 "
1128                                     "and A-F", name[i], name);
1129                                 break;
1130                         }
1131                 }
1132         } else {
1133                 log_warnx("invalid target name \"%s\"; should start with "
1134                     "either \".iqn\", \"eui.\", or \"naa.\"",
1135                     name);
1136         }
1137         return (true);
1138 }
1139
1140 struct pport *
1141 pport_new(struct conf *conf, const char *name, uint32_t ctl_port)
1142 {
1143         struct pport *pp;
1144
1145         pp = calloc(1, sizeof(*pp));
1146         if (pp == NULL)
1147                 log_err(1, "calloc");
1148         pp->pp_conf = conf;
1149         pp->pp_name = checked_strdup(name);
1150         pp->pp_ctl_port = ctl_port;
1151         TAILQ_INIT(&pp->pp_ports);
1152         TAILQ_INSERT_TAIL(&conf->conf_pports, pp, pp_next);
1153         return (pp);
1154 }
1155
1156 struct pport *
1157 pport_find(const struct conf *conf, const char *name)
1158 {
1159         struct pport *pp;
1160
1161         TAILQ_FOREACH(pp, &conf->conf_pports, pp_next) {
1162                 if (strcasecmp(pp->pp_name, name) == 0)
1163                         return (pp);
1164         }
1165         return (NULL);
1166 }
1167
1168 struct pport *
1169 pport_copy(struct pport *pp, struct conf *conf)
1170 {
1171         struct pport *ppnew;
1172
1173         ppnew = pport_new(conf, pp->pp_name, pp->pp_ctl_port);
1174         return (ppnew);
1175 }
1176
1177 void
1178 pport_delete(struct pport *pp)
1179 {
1180         struct port *port, *tport;
1181
1182         TAILQ_FOREACH_SAFE(port, &pp->pp_ports, p_ts, tport)
1183                 port_delete(port);
1184         TAILQ_REMOVE(&pp->pp_conf->conf_pports, pp, pp_next);
1185         free(pp->pp_name);
1186         free(pp);
1187 }
1188
1189 struct port *
1190 port_new(struct conf *conf, struct target *target, struct portal_group *pg)
1191 {
1192         struct port *port;
1193         char *name;
1194         int ret;
1195
1196         ret = asprintf(&name, "%s-%s", pg->pg_name, target->t_name);
1197         if (ret <= 0)
1198                 log_err(1, "asprintf");
1199         if (port_find(conf, name) != NULL) {
1200                 log_warnx("duplicate port \"%s\"", name);
1201                 free(name);
1202                 return (NULL);
1203         }
1204         port = calloc(1, sizeof(*port));
1205         if (port == NULL)
1206                 log_err(1, "calloc");
1207         port->p_conf = conf;
1208         port->p_name = name;
1209         TAILQ_INSERT_TAIL(&conf->conf_ports, port, p_next);
1210         TAILQ_INSERT_TAIL(&target->t_ports, port, p_ts);
1211         port->p_target = target;
1212         TAILQ_INSERT_TAIL(&pg->pg_ports, port, p_pgs);
1213         port->p_portal_group = pg;
1214         return (port);
1215 }
1216
1217 struct port *
1218 port_new_pp(struct conf *conf, struct target *target, struct pport *pp)
1219 {
1220         struct port *port;
1221         char *name;
1222         int ret;
1223
1224         ret = asprintf(&name, "%s-%s", pp->pp_name, target->t_name);
1225         if (ret <= 0)
1226                 log_err(1, "asprintf");
1227         if (port_find(conf, name) != NULL) {
1228                 log_warnx("duplicate port \"%s\"", name);
1229                 free(name);
1230                 return (NULL);
1231         }
1232         port = calloc(1, sizeof(*port));
1233         if (port == NULL)
1234                 log_err(1, "calloc");
1235         port->p_conf = conf;
1236         port->p_name = name;
1237         TAILQ_INSERT_TAIL(&conf->conf_ports, port, p_next);
1238         TAILQ_INSERT_TAIL(&target->t_ports, port, p_ts);
1239         port->p_target = target;
1240         TAILQ_INSERT_TAIL(&pp->pp_ports, port, p_pps);
1241         port->p_pport = pp;
1242         return (port);
1243 }
1244
1245 struct port *
1246 port_find(const struct conf *conf, const char *name)
1247 {
1248         struct port *port;
1249
1250         TAILQ_FOREACH(port, &conf->conf_ports, p_next) {
1251                 if (strcasecmp(port->p_name, name) == 0)
1252                         return (port);
1253         }
1254
1255         return (NULL);
1256 }
1257
1258 struct port *
1259 port_find_in_pg(const struct portal_group *pg, const char *target)
1260 {
1261         struct port *port;
1262
1263         TAILQ_FOREACH(port, &pg->pg_ports, p_pgs) {
1264                 if (strcasecmp(port->p_target->t_name, target) == 0)
1265                         return (port);
1266         }
1267
1268         return (NULL);
1269 }
1270
1271 void
1272 port_delete(struct port *port)
1273 {
1274
1275         if (port->p_portal_group)
1276                 TAILQ_REMOVE(&port->p_portal_group->pg_ports, port, p_pgs);
1277         if (port->p_pport)
1278                 TAILQ_REMOVE(&port->p_pport->pp_ports, port, p_pps);
1279         if (port->p_target)
1280                 TAILQ_REMOVE(&port->p_target->t_ports, port, p_ts);
1281         TAILQ_REMOVE(&port->p_conf->conf_ports, port, p_next);
1282         free(port->p_name);
1283         free(port);
1284 }
1285
1286 struct target *
1287 target_new(struct conf *conf, const char *name)
1288 {
1289         struct target *targ;
1290         int i, len;
1291
1292         targ = target_find(conf, name);
1293         if (targ != NULL) {
1294                 log_warnx("duplicated target \"%s\"", name);
1295                 return (NULL);
1296         }
1297         if (valid_iscsi_name(name) == false) {
1298                 log_warnx("target name \"%s\" is invalid", name);
1299                 return (NULL);
1300         }
1301         targ = calloc(1, sizeof(*targ));
1302         if (targ == NULL)
1303                 log_err(1, "calloc");
1304         targ->t_name = checked_strdup(name);
1305
1306         /*
1307          * RFC 3722 requires us to normalize the name to lowercase.
1308          */
1309         len = strlen(name);
1310         for (i = 0; i < len; i++)
1311                 targ->t_name[i] = tolower(targ->t_name[i]);
1312
1313         targ->t_conf = conf;
1314         TAILQ_INIT(&targ->t_ports);
1315         TAILQ_INSERT_TAIL(&conf->conf_targets, targ, t_next);
1316
1317         return (targ);
1318 }
1319
1320 void
1321 target_delete(struct target *targ)
1322 {
1323         struct port *port, *tport;
1324
1325         TAILQ_FOREACH_SAFE(port, &targ->t_ports, p_ts, tport)
1326                 port_delete(port);
1327         TAILQ_REMOVE(&targ->t_conf->conf_targets, targ, t_next);
1328
1329         free(targ->t_name);
1330         free(targ->t_redirection);
1331         free(targ);
1332 }
1333
1334 struct target *
1335 target_find(struct conf *conf, const char *name)
1336 {
1337         struct target *targ;
1338
1339         TAILQ_FOREACH(targ, &conf->conf_targets, t_next) {
1340                 if (strcasecmp(targ->t_name, name) == 0)
1341                         return (targ);
1342         }
1343
1344         return (NULL);
1345 }
1346
1347 int
1348 target_set_redirection(struct target *target, const char *addr)
1349 {
1350
1351         if (target->t_redirection != NULL) {
1352                 log_warnx("cannot set redirection to \"%s\" for "
1353                     "target \"%s\"; already defined",
1354                     addr, target->t_name);
1355                 return (1);
1356         }
1357
1358         target->t_redirection = checked_strdup(addr);
1359
1360         return (0);
1361 }
1362
1363 int
1364 target_set_offload(struct target *target, const char *offload)
1365 {
1366
1367         if (target->t_offload != NULL) {
1368                 log_warnx("cannot set offload to \"%s\" for "
1369                     "target \"%s\"; already defined",
1370                     offload, target->t_name);
1371                 return (1);
1372         }
1373
1374         target->t_offload = checked_strdup(offload);
1375
1376         return (0);
1377 }
1378
1379 struct lun *
1380 lun_new(struct conf *conf, const char *name)
1381 {
1382         struct lun *lun;
1383
1384         lun = lun_find(conf, name);
1385         if (lun != NULL) {
1386                 log_warnx("duplicated lun \"%s\"", name);
1387                 return (NULL);
1388         }
1389
1390         lun = calloc(1, sizeof(*lun));
1391         if (lun == NULL)
1392                 log_err(1, "calloc");
1393         lun->l_conf = conf;
1394         lun->l_name = checked_strdup(name);
1395         TAILQ_INIT(&lun->l_options);
1396         TAILQ_INSERT_TAIL(&conf->conf_luns, lun, l_next);
1397
1398         return (lun);
1399 }
1400
1401 void
1402 lun_delete(struct lun *lun)
1403 {
1404         struct target *targ;
1405         struct lun_option *lo, *tmp;
1406         int i;
1407
1408         TAILQ_FOREACH(targ, &lun->l_conf->conf_targets, t_next) {
1409                 for (i = 0; i < MAX_LUNS; i++) {
1410                         if (targ->t_luns[i] == lun)
1411                                 targ->t_luns[i] = NULL;
1412                 }
1413         }
1414         TAILQ_REMOVE(&lun->l_conf->conf_luns, lun, l_next);
1415
1416         TAILQ_FOREACH_SAFE(lo, &lun->l_options, lo_next, tmp)
1417                 lun_option_delete(lo);
1418         free(lun->l_name);
1419         free(lun->l_backend);
1420         free(lun->l_device_id);
1421         free(lun->l_path);
1422         free(lun->l_scsiname);
1423         free(lun->l_serial);
1424         free(lun);
1425 }
1426
1427 struct lun *
1428 lun_find(const struct conf *conf, const char *name)
1429 {
1430         struct lun *lun;
1431
1432         TAILQ_FOREACH(lun, &conf->conf_luns, l_next) {
1433                 if (strcmp(lun->l_name, name) == 0)
1434                         return (lun);
1435         }
1436
1437         return (NULL);
1438 }
1439
1440 void
1441 lun_set_backend(struct lun *lun, const char *value)
1442 {
1443         free(lun->l_backend);
1444         lun->l_backend = checked_strdup(value);
1445 }
1446
1447 void
1448 lun_set_blocksize(struct lun *lun, size_t value)
1449 {
1450
1451         lun->l_blocksize = value;
1452 }
1453
1454 void
1455 lun_set_device_id(struct lun *lun, const char *value)
1456 {
1457         free(lun->l_device_id);
1458         lun->l_device_id = checked_strdup(value);
1459 }
1460
1461 void
1462 lun_set_path(struct lun *lun, const char *value)
1463 {
1464         free(lun->l_path);
1465         lun->l_path = checked_strdup(value);
1466 }
1467
1468 void
1469 lun_set_scsiname(struct lun *lun, const char *value)
1470 {
1471         free(lun->l_scsiname);
1472         lun->l_scsiname = checked_strdup(value);
1473 }
1474
1475 void
1476 lun_set_serial(struct lun *lun, const char *value)
1477 {
1478         free(lun->l_serial);
1479         lun->l_serial = checked_strdup(value);
1480 }
1481
1482 void
1483 lun_set_size(struct lun *lun, size_t value)
1484 {
1485
1486         lun->l_size = value;
1487 }
1488
1489 void
1490 lun_set_ctl_lun(struct lun *lun, uint32_t value)
1491 {
1492
1493         lun->l_ctl_lun = value;
1494 }
1495
1496 struct lun_option *
1497 lun_option_new(struct lun *lun, const char *name, const char *value)
1498 {
1499         struct lun_option *lo;
1500
1501         lo = lun_option_find(lun, name);
1502         if (lo != NULL) {
1503                 log_warnx("duplicated lun option \"%s\" for lun \"%s\"",
1504                     name, lun->l_name);
1505                 return (NULL);
1506         }
1507
1508         lo = calloc(1, sizeof(*lo));
1509         if (lo == NULL)
1510                 log_err(1, "calloc");
1511         lo->lo_name = checked_strdup(name);
1512         lo->lo_value = checked_strdup(value);
1513         lo->lo_lun = lun;
1514         TAILQ_INSERT_TAIL(&lun->l_options, lo, lo_next);
1515
1516         return (lo);
1517 }
1518
1519 void
1520 lun_option_delete(struct lun_option *lo)
1521 {
1522
1523         TAILQ_REMOVE(&lo->lo_lun->l_options, lo, lo_next);
1524
1525         free(lo->lo_name);
1526         free(lo->lo_value);
1527         free(lo);
1528 }
1529
1530 struct lun_option *
1531 lun_option_find(const struct lun *lun, const char *name)
1532 {
1533         struct lun_option *lo;
1534
1535         TAILQ_FOREACH(lo, &lun->l_options, lo_next) {
1536                 if (strcmp(lo->lo_name, name) == 0)
1537                         return (lo);
1538         }
1539
1540         return (NULL);
1541 }
1542
1543 void
1544 lun_option_set(struct lun_option *lo, const char *value)
1545 {
1546
1547         free(lo->lo_value);
1548         lo->lo_value = checked_strdup(value);
1549 }
1550
1551 static struct connection *
1552 connection_new(struct portal *portal, int fd, const char *host,
1553     const struct sockaddr *client_sa)
1554 {
1555         struct connection *conn;
1556
1557         conn = calloc(1, sizeof(*conn));
1558         if (conn == NULL)
1559                 log_err(1, "calloc");
1560         conn->conn_portal = portal;
1561         conn->conn_socket = fd;
1562         conn->conn_initiator_addr = checked_strdup(host);
1563         memcpy(&conn->conn_initiator_sa, client_sa, client_sa->sa_len);
1564
1565         /*
1566          * Default values, from RFC 3720, section 12.
1567          */
1568         conn->conn_max_data_segment_length = 8192;
1569         conn->conn_max_burst_length = 262144;
1570         conn->conn_immediate_data = true;
1571
1572         return (conn);
1573 }
1574
1575 #if 0
1576 static void
1577 conf_print(struct conf *conf)
1578 {
1579         struct auth_group *ag;
1580         struct auth *auth;
1581         struct auth_name *auth_name;
1582         struct auth_portal *auth_portal;
1583         struct portal_group *pg;
1584         struct portal *portal;
1585         struct target *targ;
1586         struct lun *lun;
1587         struct lun_option *lo;
1588
1589         TAILQ_FOREACH(ag, &conf->conf_auth_groups, ag_next) {
1590                 fprintf(stderr, "auth-group %s {\n", ag->ag_name);
1591                 TAILQ_FOREACH(auth, &ag->ag_auths, a_next)
1592                         fprintf(stderr, "\t chap-mutual %s %s %s %s\n",
1593                             auth->a_user, auth->a_secret,
1594                             auth->a_mutual_user, auth->a_mutual_secret);
1595                 TAILQ_FOREACH(auth_name, &ag->ag_names, an_next)
1596                         fprintf(stderr, "\t initiator-name %s\n",
1597                             auth_name->an_initator_name);
1598                 TAILQ_FOREACH(auth_portal, &ag->ag_portals, an_next)
1599                         fprintf(stderr, "\t initiator-portal %s\n",
1600                             auth_portal->an_initator_portal);
1601                 fprintf(stderr, "}\n");
1602         }
1603         TAILQ_FOREACH(pg, &conf->conf_portal_groups, pg_next) {
1604                 fprintf(stderr, "portal-group %s {\n", pg->pg_name);
1605                 TAILQ_FOREACH(portal, &pg->pg_portals, p_next)
1606                         fprintf(stderr, "\t listen %s\n", portal->p_listen);
1607                 fprintf(stderr, "}\n");
1608         }
1609         TAILQ_FOREACH(lun, &conf->conf_luns, l_next) {
1610                 fprintf(stderr, "\tlun %s {\n", lun->l_name);
1611                 fprintf(stderr, "\t\tpath %s\n", lun->l_path);
1612                 TAILQ_FOREACH(lo, &lun->l_options, lo_next)
1613                         fprintf(stderr, "\t\toption %s %s\n",
1614                             lo->lo_name, lo->lo_value);
1615                 fprintf(stderr, "\t}\n");
1616         }
1617         TAILQ_FOREACH(targ, &conf->conf_targets, t_next) {
1618                 fprintf(stderr, "target %s {\n", targ->t_name);
1619                 if (targ->t_alias != NULL)
1620                         fprintf(stderr, "\t alias %s\n", targ->t_alias);
1621                 if (targ->t_offload != NULL)
1622                         fprintf(stderr, "\t offload %s\n", targ->t_offload);
1623                 fprintf(stderr, "}\n");
1624         }
1625 }
1626 #endif
1627
1628 static int
1629 conf_verify_lun(struct lun *lun)
1630 {
1631         const struct lun *lun2;
1632
1633         if (lun->l_backend == NULL)
1634                 lun_set_backend(lun, "block");
1635         if (strcmp(lun->l_backend, "block") == 0) {
1636                 if (lun->l_path == NULL) {
1637                         log_warnx("missing path for lun \"%s\"",
1638                             lun->l_name);
1639                         return (1);
1640                 }
1641         } else if (strcmp(lun->l_backend, "ramdisk") == 0) {
1642                 if (lun->l_size == 0) {
1643                         log_warnx("missing size for ramdisk-backed lun \"%s\"",
1644                             lun->l_name);
1645                         return (1);
1646                 }
1647                 if (lun->l_path != NULL) {
1648                         log_warnx("path must not be specified "
1649                             "for ramdisk-backed lun \"%s\"",
1650                             lun->l_name);
1651                         return (1);
1652                 }
1653         }
1654         if (lun->l_blocksize == 0) {
1655                 lun_set_blocksize(lun, DEFAULT_BLOCKSIZE);
1656         } else if (lun->l_blocksize < 0) {
1657                 log_warnx("invalid blocksize for lun \"%s\"; "
1658                     "must be larger than 0", lun->l_name);
1659                 return (1);
1660         }
1661         if (lun->l_size != 0 && lun->l_size % lun->l_blocksize != 0) {
1662                 log_warnx("invalid size for lun \"%s\"; "
1663                     "must be multiple of blocksize", lun->l_name);
1664                 return (1);
1665         }
1666         TAILQ_FOREACH(lun2, &lun->l_conf->conf_luns, l_next) {
1667                 if (lun == lun2)
1668                         continue;
1669                 if (lun->l_path != NULL && lun2->l_path != NULL &&
1670                     strcmp(lun->l_path, lun2->l_path) == 0) {
1671                         log_debugx("WARNING: path \"%s\" duplicated "
1672                             "between lun \"%s\", and "
1673                             "lun \"%s\"", lun->l_path,
1674                             lun->l_name, lun2->l_name);
1675                 }
1676         }
1677
1678         return (0);
1679 }
1680
1681 int
1682 conf_verify(struct conf *conf)
1683 {
1684         struct auth_group *ag;
1685         struct portal_group *pg;
1686         struct port *port;
1687         struct target *targ;
1688         struct lun *lun;
1689         bool found;
1690         int error, i;
1691
1692         if (conf->conf_pidfile_path == NULL)
1693                 conf->conf_pidfile_path = checked_strdup(DEFAULT_PIDFILE);
1694
1695         TAILQ_FOREACH(lun, &conf->conf_luns, l_next) {
1696                 error = conf_verify_lun(lun);
1697                 if (error != 0)
1698                         return (error);
1699         }
1700         TAILQ_FOREACH(targ, &conf->conf_targets, t_next) {
1701                 if (targ->t_auth_group == NULL) {
1702                         targ->t_auth_group = auth_group_find(conf,
1703                             "default");
1704                         assert(targ->t_auth_group != NULL);
1705                 }
1706                 if (TAILQ_EMPTY(&targ->t_ports)) {
1707                         pg = portal_group_find(conf, "default");
1708                         assert(pg != NULL);
1709                         port_new(conf, targ, pg);
1710                 }
1711                 found = false;
1712                 for (i = 0; i < MAX_LUNS; i++) {
1713                         if (targ->t_luns[i] != NULL)
1714                                 found = true;
1715                 }
1716                 if (!found && targ->t_redirection == NULL) {
1717                         log_warnx("no LUNs defined for target \"%s\"",
1718                             targ->t_name);
1719                 }
1720                 if (found && targ->t_redirection != NULL) {
1721                         log_debugx("target \"%s\" contains luns, "
1722                             " but configured for redirection",
1723                             targ->t_name);
1724                 }
1725         }
1726         TAILQ_FOREACH(pg, &conf->conf_portal_groups, pg_next) {
1727                 assert(pg->pg_name != NULL);
1728                 if (pg->pg_discovery_auth_group == NULL) {
1729                         pg->pg_discovery_auth_group =
1730                             auth_group_find(conf, "default");
1731                         assert(pg->pg_discovery_auth_group != NULL);
1732                 }
1733
1734                 if (pg->pg_discovery_filter == PG_FILTER_UNKNOWN)
1735                         pg->pg_discovery_filter = PG_FILTER_NONE;
1736
1737                 if (!TAILQ_EMPTY(&pg->pg_ports)) {
1738                         if (pg->pg_redirection != NULL) {
1739                                 log_debugx("portal-group \"%s\" assigned "
1740                                     "to target, but configured "
1741                                     "for redirection",
1742                                     pg->pg_name);
1743                         }
1744                         pg->pg_unassigned = false;
1745                 } else {
1746                         if (strcmp(pg->pg_name, "default") != 0)
1747                                 log_warnx("portal-group \"%s\" not assigned "
1748                                     "to any target", pg->pg_name);
1749                         pg->pg_unassigned = true;
1750                 }
1751         }
1752         TAILQ_FOREACH(ag, &conf->conf_auth_groups, ag_next) {
1753                 if (ag->ag_name == NULL)
1754                         assert(ag->ag_target != NULL);
1755                 else
1756                         assert(ag->ag_target == NULL);
1757
1758                 found = false;
1759                 TAILQ_FOREACH(targ, &conf->conf_targets, t_next) {
1760                         if (targ->t_auth_group == ag) {
1761                                 found = true;
1762                                 break;
1763                         }
1764                 }
1765                 TAILQ_FOREACH(port, &conf->conf_ports, p_next) {
1766                         if (port->p_auth_group == ag) {
1767                                 found = true;
1768                                 break;
1769                         }
1770                 }
1771                 TAILQ_FOREACH(pg, &conf->conf_portal_groups, pg_next) {
1772                         if (pg->pg_discovery_auth_group == ag) {
1773                                 found = true;
1774                                 break;
1775                         }
1776                 }
1777                 if (!found && ag->ag_name != NULL &&
1778                     strcmp(ag->ag_name, "default") != 0 &&
1779                     strcmp(ag->ag_name, "no-authentication") != 0 &&
1780                     strcmp(ag->ag_name, "no-access") != 0) {
1781                         log_warnx("auth-group \"%s\" not assigned "
1782                             "to any target", ag->ag_name);
1783                 }
1784         }
1785
1786         return (0);
1787 }
1788
1789 static int
1790 conf_apply(struct conf *oldconf, struct conf *newconf)
1791 {
1792         struct lun *oldlun, *newlun, *tmplun;
1793         struct portal_group *oldpg, *newpg;
1794         struct portal *oldp, *newp;
1795         struct port *oldport, *newport, *tmpport;
1796         struct isns *oldns, *newns;
1797         pid_t otherpid;
1798         int changed, cumulated_error = 0, error, sockbuf;
1799         int one = 1;
1800
1801         if (oldconf->conf_debug != newconf->conf_debug) {
1802                 log_debugx("changing debug level to %d", newconf->conf_debug);
1803                 log_init(newconf->conf_debug);
1804         }
1805
1806         if (oldconf->conf_pidfh != NULL) {
1807                 assert(oldconf->conf_pidfile_path != NULL);
1808                 if (newconf->conf_pidfile_path != NULL &&
1809                     strcmp(oldconf->conf_pidfile_path,
1810                     newconf->conf_pidfile_path) == 0) {
1811                         newconf->conf_pidfh = oldconf->conf_pidfh;
1812                         oldconf->conf_pidfh = NULL;
1813                 } else {
1814                         log_debugx("removing pidfile %s",
1815                             oldconf->conf_pidfile_path);
1816                         pidfile_remove(oldconf->conf_pidfh);
1817                         oldconf->conf_pidfh = NULL;
1818                 }
1819         }
1820
1821         if (newconf->conf_pidfh == NULL && newconf->conf_pidfile_path != NULL) {
1822                 log_debugx("opening pidfile %s", newconf->conf_pidfile_path);
1823                 newconf->conf_pidfh =
1824                     pidfile_open(newconf->conf_pidfile_path, 0600, &otherpid);
1825                 if (newconf->conf_pidfh == NULL) {
1826                         if (errno == EEXIST)
1827                                 log_errx(1, "daemon already running, pid: %jd.",
1828                                     (intmax_t)otherpid);
1829                         log_err(1, "cannot open or create pidfile \"%s\"",
1830                             newconf->conf_pidfile_path);
1831                 }
1832         }
1833
1834         /*
1835          * Go through the new portal groups, assigning tags or preserving old.
1836          */
1837         TAILQ_FOREACH(newpg, &newconf->conf_portal_groups, pg_next) {
1838                 oldpg = portal_group_find(oldconf, newpg->pg_name);
1839                 if (oldpg != NULL)
1840                         newpg->pg_tag = oldpg->pg_tag;
1841                 else
1842                         newpg->pg_tag = ++last_portal_group_tag;
1843         }
1844
1845         /* Deregister on removed iSNS servers. */
1846         TAILQ_FOREACH(oldns, &oldconf->conf_isns, i_next) {
1847                 TAILQ_FOREACH(newns, &newconf->conf_isns, i_next) {
1848                         if (strcmp(oldns->i_addr, newns->i_addr) == 0)
1849                                 break;
1850                 }
1851                 if (newns == NULL)
1852                         isns_deregister(oldns);
1853         }
1854
1855         /*
1856          * XXX: If target or lun removal fails, we should somehow "move"
1857          *      the old lun or target into newconf, so that subsequent
1858          *      conf_apply() would try to remove them again.  That would
1859          *      be somewhat hairy, though, and lun deletion failures don't
1860          *      really happen, so leave it as it is for now.
1861          */
1862         /*
1863          * First, remove any ports present in the old configuration
1864          * and missing in the new one.
1865          */
1866         TAILQ_FOREACH_SAFE(oldport, &oldconf->conf_ports, p_next, tmpport) {
1867                 newport = port_find(newconf, oldport->p_name);
1868                 if (newport != NULL)
1869                         continue;
1870                 log_debugx("removing port \"%s\"", oldport->p_name);
1871                 error = kernel_port_remove(oldport);
1872                 if (error != 0) {
1873                         log_warnx("failed to remove port %s",
1874                             oldport->p_name);
1875                         /*
1876                          * XXX: Uncomment after fixing the root cause.
1877                          *
1878                          * cumulated_error++;
1879                          */
1880                 }
1881         }
1882
1883         /*
1884          * Second, remove any LUNs present in the old configuration
1885          * and missing in the new one.
1886          */
1887         TAILQ_FOREACH_SAFE(oldlun, &oldconf->conf_luns, l_next, tmplun) {
1888                 newlun = lun_find(newconf, oldlun->l_name);
1889                 if (newlun == NULL) {
1890                         log_debugx("lun \"%s\", CTL lun %d "
1891                             "not found in new configuration; "
1892                             "removing", oldlun->l_name, oldlun->l_ctl_lun);
1893                         error = kernel_lun_remove(oldlun);
1894                         if (error != 0) {
1895                                 log_warnx("failed to remove lun \"%s\", "
1896                                     "CTL lun %d",
1897                                     oldlun->l_name, oldlun->l_ctl_lun);
1898                                 cumulated_error++;
1899                         }
1900                         continue;
1901                 }
1902
1903                 /*
1904                  * Also remove the LUNs changed by more than size.
1905                  */
1906                 changed = 0;
1907                 assert(oldlun->l_backend != NULL);
1908                 assert(newlun->l_backend != NULL);
1909                 if (strcmp(newlun->l_backend, oldlun->l_backend) != 0) {
1910                         log_debugx("backend for lun \"%s\", "
1911                             "CTL lun %d changed; removing",
1912                             oldlun->l_name, oldlun->l_ctl_lun);
1913                         changed = 1;
1914                 }
1915                 if (oldlun->l_blocksize != newlun->l_blocksize) {
1916                         log_debugx("blocksize for lun \"%s\", "
1917                             "CTL lun %d changed; removing",
1918                             oldlun->l_name, oldlun->l_ctl_lun);
1919                         changed = 1;
1920                 }
1921                 if (newlun->l_device_id != NULL &&
1922                     (oldlun->l_device_id == NULL ||
1923                      strcmp(oldlun->l_device_id, newlun->l_device_id) !=
1924                      0)) {
1925                         log_debugx("device-id for lun \"%s\", "
1926                             "CTL lun %d changed; removing",
1927                             oldlun->l_name, oldlun->l_ctl_lun);
1928                         changed = 1;
1929                 }
1930                 if (newlun->l_path != NULL &&
1931                     (oldlun->l_path == NULL ||
1932                      strcmp(oldlun->l_path, newlun->l_path) != 0)) {
1933                         log_debugx("path for lun \"%s\", "
1934                             "CTL lun %d, changed; removing",
1935                             oldlun->l_name, oldlun->l_ctl_lun);
1936                         changed = 1;
1937                 }
1938                 if (newlun->l_serial != NULL &&
1939                     (oldlun->l_serial == NULL ||
1940                      strcmp(oldlun->l_serial, newlun->l_serial) != 0)) {
1941                         log_debugx("serial for lun \"%s\", "
1942                             "CTL lun %d changed; removing",
1943                             oldlun->l_name, oldlun->l_ctl_lun);
1944                         changed = 1;
1945                 }
1946                 if (changed) {
1947                         error = kernel_lun_remove(oldlun);
1948                         if (error != 0) {
1949                                 log_warnx("failed to remove lun \"%s\", "
1950                                     "CTL lun %d",
1951                                     oldlun->l_name, oldlun->l_ctl_lun);
1952                                 cumulated_error++;
1953                         }
1954                         lun_delete(oldlun);
1955                         continue;
1956                 }
1957
1958                 lun_set_ctl_lun(newlun, oldlun->l_ctl_lun);
1959         }
1960
1961         TAILQ_FOREACH_SAFE(newlun, &newconf->conf_luns, l_next, tmplun) {
1962                 oldlun = lun_find(oldconf, newlun->l_name);
1963                 if (oldlun != NULL) {
1964                         if (newlun->l_size != oldlun->l_size ||
1965                             newlun->l_size == 0) {
1966                                 log_debugx("resizing lun \"%s\", CTL lun %d",
1967                                     newlun->l_name, newlun->l_ctl_lun);
1968                                 error = kernel_lun_resize(newlun);
1969                                 if (error != 0) {
1970                                         log_warnx("failed to "
1971                                             "resize lun \"%s\", CTL lun %d",
1972                                             newlun->l_name,
1973                                             newlun->l_ctl_lun);
1974                                         cumulated_error++;
1975                                 }
1976                         }
1977                         continue;
1978                 }
1979                 log_debugx("adding lun \"%s\"", newlun->l_name);
1980                 error = kernel_lun_add(newlun);
1981                 if (error != 0) {
1982                         log_warnx("failed to add lun \"%s\"", newlun->l_name);
1983                         lun_delete(newlun);
1984                         cumulated_error++;
1985                 }
1986         }
1987
1988         /*
1989          * Now add new ports or modify existing ones.
1990          */
1991         TAILQ_FOREACH(newport, &newconf->conf_ports, p_next) {
1992                 oldport = port_find(oldconf, newport->p_name);
1993
1994                 if (oldport == NULL) {
1995                         log_debugx("adding port \"%s\"", newport->p_name);
1996                         error = kernel_port_add(newport);
1997                 } else {
1998                         log_debugx("updating port \"%s\"", newport->p_name);
1999                         newport->p_ctl_port = oldport->p_ctl_port;
2000                         error = kernel_port_update(newport);
2001                 }
2002                 if (error != 0) {
2003                         log_warnx("failed to %s port %s",
2004                             (oldport == NULL) ? "add" : "update",
2005                             newport->p_name);
2006                         /*
2007                          * XXX: Uncomment after fixing the root cause.
2008                          *
2009                          * cumulated_error++;
2010                          */
2011                 }
2012         }
2013
2014         /*
2015          * Go through the new portals, opening the sockets as neccessary.
2016          */
2017         TAILQ_FOREACH(newpg, &newconf->conf_portal_groups, pg_next) {
2018                 if (newpg->pg_unassigned) {
2019                         log_debugx("not listening on portal-group \"%s\", "
2020                             "not assigned to any target",
2021                             newpg->pg_name);
2022                         continue;
2023                 }
2024                 TAILQ_FOREACH(newp, &newpg->pg_portals, p_next) {
2025                         /*
2026                          * Try to find already open portal and reuse
2027                          * the listening socket.  We don't care about
2028                          * what portal or portal group that was, what
2029                          * matters is the listening address.
2030                          */
2031                         TAILQ_FOREACH(oldpg, &oldconf->conf_portal_groups,
2032                             pg_next) {
2033                                 TAILQ_FOREACH(oldp, &oldpg->pg_portals,
2034                                     p_next) {
2035                                         if (strcmp(newp->p_listen,
2036                                             oldp->p_listen) == 0 &&
2037                                             oldp->p_socket > 0) {
2038                                                 newp->p_socket =
2039                                                     oldp->p_socket;
2040                                                 oldp->p_socket = 0;
2041                                                 break;
2042                                         }
2043                                 }
2044                         }
2045                         if (newp->p_socket > 0) {
2046                                 /*
2047                                  * We're done with this portal.
2048                                  */
2049                                 continue;
2050                         }
2051
2052 #ifdef ICL_KERNEL_PROXY
2053                         if (proxy_mode) {
2054                                 newpg->pg_conf->conf_portal_id++;
2055                                 newp->p_id = newpg->pg_conf->conf_portal_id;
2056                                 log_debugx("listening on %s, portal-group "
2057                                     "\"%s\", portal id %d, using ICL proxy",
2058                                     newp->p_listen, newpg->pg_name, newp->p_id);
2059                                 kernel_listen(newp->p_ai, newp->p_iser,
2060                                     newp->p_id);
2061                                 continue;
2062                         }
2063 #endif
2064                         assert(proxy_mode == false);
2065                         assert(newp->p_iser == false);
2066
2067                         log_debugx("listening on %s, portal-group \"%s\"",
2068                             newp->p_listen, newpg->pg_name);
2069                         newp->p_socket = socket(newp->p_ai->ai_family,
2070                             newp->p_ai->ai_socktype,
2071                             newp->p_ai->ai_protocol);
2072                         if (newp->p_socket < 0) {
2073                                 log_warn("socket(2) failed for %s",
2074                                     newp->p_listen);
2075                                 cumulated_error++;
2076                                 continue;
2077                         }
2078                         sockbuf = SOCKBUF_SIZE;
2079                         if (setsockopt(newp->p_socket, SOL_SOCKET, SO_RCVBUF,
2080                             &sockbuf, sizeof(sockbuf)) == -1)
2081                                 log_warn("setsockopt(SO_RCVBUF) failed "
2082                                     "for %s", newp->p_listen);
2083                         sockbuf = SOCKBUF_SIZE;
2084                         if (setsockopt(newp->p_socket, SOL_SOCKET, SO_SNDBUF,
2085                             &sockbuf, sizeof(sockbuf)) == -1)
2086                                 log_warn("setsockopt(SO_SNDBUF) failed "
2087                                     "for %s", newp->p_listen);
2088                         error = setsockopt(newp->p_socket, SOL_SOCKET,
2089                             SO_REUSEADDR, &one, sizeof(one));
2090                         if (error != 0) {
2091                                 log_warn("setsockopt(SO_REUSEADDR) failed "
2092                                     "for %s", newp->p_listen);
2093                                 close(newp->p_socket);
2094                                 newp->p_socket = 0;
2095                                 cumulated_error++;
2096                                 continue;
2097                         }
2098                         error = bind(newp->p_socket, newp->p_ai->ai_addr,
2099                             newp->p_ai->ai_addrlen);
2100                         if (error != 0) {
2101                                 log_warn("bind(2) failed for %s",
2102                                     newp->p_listen);
2103                                 close(newp->p_socket);
2104                                 newp->p_socket = 0;
2105                                 cumulated_error++;
2106                                 continue;
2107                         }
2108                         error = listen(newp->p_socket, -1);
2109                         if (error != 0) {
2110                                 log_warn("listen(2) failed for %s",
2111                                     newp->p_listen);
2112                                 close(newp->p_socket);
2113                                 newp->p_socket = 0;
2114                                 cumulated_error++;
2115                                 continue;
2116                         }
2117                 }
2118         }
2119
2120         /*
2121          * Go through the no longer used sockets, closing them.
2122          */
2123         TAILQ_FOREACH(oldpg, &oldconf->conf_portal_groups, pg_next) {
2124                 TAILQ_FOREACH(oldp, &oldpg->pg_portals, p_next) {
2125                         if (oldp->p_socket <= 0)
2126                                 continue;
2127                         log_debugx("closing socket for %s, portal-group \"%s\"",
2128                             oldp->p_listen, oldpg->pg_name);
2129                         close(oldp->p_socket);
2130                         oldp->p_socket = 0;
2131                 }
2132         }
2133
2134         /* (Re-)Register on remaining/new iSNS servers. */
2135         TAILQ_FOREACH(newns, &newconf->conf_isns, i_next) {
2136                 TAILQ_FOREACH(oldns, &oldconf->conf_isns, i_next) {
2137                         if (strcmp(oldns->i_addr, newns->i_addr) == 0)
2138                                 break;
2139                 }
2140                 isns_register(newns, oldns);
2141         }
2142
2143         /* Schedule iSNS update */
2144         if (!TAILQ_EMPTY(&newconf->conf_isns))
2145                 set_timeout((newconf->conf_isns_period + 2) / 3, false);
2146
2147         return (cumulated_error);
2148 }
2149
2150 bool
2151 timed_out(void)
2152 {
2153
2154         return (sigalrm_received);
2155 }
2156
2157 static void
2158 sigalrm_handler_fatal(int dummy __unused)
2159 {
2160         /*
2161          * It would be easiest to just log an error and exit.  We can't
2162          * do this, though, because log_errx() is not signal safe, since
2163          * it calls syslog(3).  Instead, set a flag checked by pdu_send()
2164          * and pdu_receive(), to call log_errx() there.  Should they fail
2165          * to notice, we'll exit here one second later.
2166          */
2167         if (sigalrm_received) {
2168                 /*
2169                  * Oh well.  Just give up and quit.
2170                  */
2171                 _exit(2);
2172         }
2173
2174         sigalrm_received = true;
2175 }
2176
2177 static void
2178 sigalrm_handler(int dummy __unused)
2179 {
2180
2181         sigalrm_received = true;
2182 }
2183
2184 void
2185 set_timeout(int timeout, int fatal)
2186 {
2187         struct sigaction sa;
2188         struct itimerval itv;
2189         int error;
2190
2191         if (timeout <= 0) {
2192                 log_debugx("session timeout disabled");
2193                 bzero(&itv, sizeof(itv));
2194                 error = setitimer(ITIMER_REAL, &itv, NULL);
2195                 if (error != 0)
2196                         log_err(1, "setitimer");
2197                 sigalrm_received = false;
2198                 return;
2199         }
2200
2201         sigalrm_received = false;
2202         bzero(&sa, sizeof(sa));
2203         if (fatal)
2204                 sa.sa_handler = sigalrm_handler_fatal;
2205         else
2206                 sa.sa_handler = sigalrm_handler;
2207         sigfillset(&sa.sa_mask);
2208         error = sigaction(SIGALRM, &sa, NULL);
2209         if (error != 0)
2210                 log_err(1, "sigaction");
2211
2212         /*
2213          * First SIGALRM will arive after conf_timeout seconds.
2214          * If we do nothing, another one will arrive a second later.
2215          */
2216         log_debugx("setting session timeout to %d seconds", timeout);
2217         bzero(&itv, sizeof(itv));
2218         itv.it_interval.tv_sec = 1;
2219         itv.it_value.tv_sec = timeout;
2220         error = setitimer(ITIMER_REAL, &itv, NULL);
2221         if (error != 0)
2222                 log_err(1, "setitimer");
2223 }
2224
2225 static int
2226 wait_for_children(bool block)
2227 {
2228         pid_t pid;
2229         int status;
2230         int num = 0;
2231
2232         for (;;) {
2233                 /*
2234                  * If "block" is true, wait for at least one process.
2235                  */
2236                 if (block && num == 0)
2237                         pid = wait4(-1, &status, 0, NULL);
2238                 else
2239                         pid = wait4(-1, &status, WNOHANG, NULL);
2240                 if (pid <= 0)
2241                         break;
2242                 if (WIFSIGNALED(status)) {
2243                         log_warnx("child process %d terminated with signal %d",
2244                             pid, WTERMSIG(status));
2245                 } else if (WEXITSTATUS(status) != 0) {
2246                         log_warnx("child process %d terminated with exit status %d",
2247                             pid, WEXITSTATUS(status));
2248                 } else {
2249                         log_debugx("child process %d terminated gracefully", pid);
2250                 }
2251                 num++;
2252         }
2253
2254         return (num);
2255 }
2256
2257 static void
2258 handle_connection(struct portal *portal, int fd,
2259     const struct sockaddr *client_sa, bool dont_fork)
2260 {
2261         struct connection *conn;
2262         int error;
2263         pid_t pid;
2264         char host[NI_MAXHOST + 1];
2265         struct conf *conf;
2266
2267         conf = portal->p_portal_group->pg_conf;
2268
2269         if (dont_fork) {
2270                 log_debugx("incoming connection; not forking due to -d flag");
2271         } else {
2272                 nchildren -= wait_for_children(false);
2273                 assert(nchildren >= 0);
2274
2275                 while (conf->conf_maxproc > 0 && nchildren >= conf->conf_maxproc) {
2276                         log_debugx("maxproc limit of %d child processes hit; "
2277                             "waiting for child process to exit", conf->conf_maxproc);
2278                         nchildren -= wait_for_children(true);
2279                         assert(nchildren >= 0);
2280                 }
2281                 log_debugx("incoming connection; forking child process #%d",
2282                     nchildren);
2283                 nchildren++;
2284                 pid = fork();
2285                 if (pid < 0)
2286                         log_err(1, "fork");
2287                 if (pid > 0) {
2288                         close(fd);
2289                         return;
2290                 }
2291         }
2292         pidfile_close(conf->conf_pidfh);
2293
2294         error = getnameinfo(client_sa, client_sa->sa_len,
2295             host, sizeof(host), NULL, 0, NI_NUMERICHOST);
2296         if (error != 0)
2297                 log_errx(1, "getnameinfo: %s", gai_strerror(error));
2298
2299         log_debugx("accepted connection from %s; portal group \"%s\"",
2300             host, portal->p_portal_group->pg_name);
2301         log_set_peer_addr(host);
2302         setproctitle("%s", host);
2303
2304         conn = connection_new(portal, fd, host, client_sa);
2305         set_timeout(conf->conf_timeout, true);
2306         kernel_capsicate();
2307         login(conn);
2308         if (conn->conn_session_type == CONN_SESSION_TYPE_NORMAL) {
2309                 kernel_handoff(conn);
2310                 log_debugx("connection handed off to the kernel");
2311         } else {
2312                 assert(conn->conn_session_type == CONN_SESSION_TYPE_DISCOVERY);
2313                 discovery(conn);
2314         }
2315         log_debugx("nothing more to do; exiting");
2316         exit(0);
2317 }
2318
2319 static int
2320 fd_add(int fd, fd_set *fdset, int nfds)
2321 {
2322
2323         /*
2324          * Skip sockets which we failed to bind.
2325          */
2326         if (fd <= 0)
2327                 return (nfds);
2328
2329         FD_SET(fd, fdset);
2330         if (fd > nfds)
2331                 nfds = fd;
2332         return (nfds);
2333 }
2334
2335 static void
2336 main_loop(struct conf *conf, bool dont_fork)
2337 {
2338         struct portal_group *pg;
2339         struct portal *portal;
2340         struct sockaddr_storage client_sa;
2341         socklen_t client_salen;
2342 #ifdef ICL_KERNEL_PROXY
2343         int connection_id;
2344         int portal_id;
2345 #endif
2346         fd_set fdset;
2347         int error, nfds, client_fd;
2348
2349         pidfile_write(conf->conf_pidfh);
2350
2351         for (;;) {
2352                 if (sighup_received || sigterm_received || timed_out())
2353                         return;
2354
2355 #ifdef ICL_KERNEL_PROXY
2356                 if (proxy_mode) {
2357                         client_salen = sizeof(client_sa);
2358                         kernel_accept(&connection_id, &portal_id,
2359                             (struct sockaddr *)&client_sa, &client_salen);
2360                         assert(client_salen >= client_sa.ss_len);
2361
2362                         log_debugx("incoming connection, id %d, portal id %d",
2363                             connection_id, portal_id);
2364                         TAILQ_FOREACH(pg, &conf->conf_portal_groups, pg_next) {
2365                                 TAILQ_FOREACH(portal, &pg->pg_portals, p_next) {
2366                                         if (portal->p_id == portal_id) {
2367                                                 goto found;
2368                                         }
2369                                 }
2370                         }
2371
2372                         log_errx(1, "kernel returned invalid portal_id %d",
2373                             portal_id);
2374
2375 found:
2376                         handle_connection(portal, connection_id,
2377                             (struct sockaddr *)&client_sa, dont_fork);
2378                 } else {
2379 #endif
2380                         assert(proxy_mode == false);
2381
2382                         FD_ZERO(&fdset);
2383                         nfds = 0;
2384                         TAILQ_FOREACH(pg, &conf->conf_portal_groups, pg_next) {
2385                                 TAILQ_FOREACH(portal, &pg->pg_portals, p_next)
2386                                         nfds = fd_add(portal->p_socket, &fdset, nfds);
2387                         }
2388                         error = select(nfds + 1, &fdset, NULL, NULL, NULL);
2389                         if (error <= 0) {
2390                                 if (errno == EINTR)
2391                                         return;
2392                                 log_err(1, "select");
2393                         }
2394                         TAILQ_FOREACH(pg, &conf->conf_portal_groups, pg_next) {
2395                                 TAILQ_FOREACH(portal, &pg->pg_portals, p_next) {
2396                                         if (!FD_ISSET(portal->p_socket, &fdset))
2397                                                 continue;
2398                                         client_salen = sizeof(client_sa);
2399                                         client_fd = accept(portal->p_socket,
2400                                             (struct sockaddr *)&client_sa,
2401                                             &client_salen);
2402                                         if (client_fd < 0)
2403                                                 log_err(1, "accept");
2404                                         assert(client_salen >= client_sa.ss_len);
2405
2406                                         handle_connection(portal, client_fd,
2407                                             (struct sockaddr *)&client_sa,
2408                                             dont_fork);
2409                                         break;
2410                                 }
2411                         }
2412 #ifdef ICL_KERNEL_PROXY
2413                 }
2414 #endif
2415         }
2416 }
2417
2418 static void
2419 sighup_handler(int dummy __unused)
2420 {
2421
2422         sighup_received = true;
2423 }
2424
2425 static void
2426 sigterm_handler(int dummy __unused)
2427 {
2428
2429         sigterm_received = true;
2430 }
2431
2432 static void
2433 sigchld_handler(int dummy __unused)
2434 {
2435
2436         /*
2437          * The only purpose of this handler is to make SIGCHLD
2438          * interrupt the ISCSIDWAIT ioctl(2), so we can call
2439          * wait_for_children().
2440          */
2441 }
2442
2443 static void
2444 register_signals(void)
2445 {
2446         struct sigaction sa;
2447         int error;
2448
2449         bzero(&sa, sizeof(sa));
2450         sa.sa_handler = sighup_handler;
2451         sigfillset(&sa.sa_mask);
2452         error = sigaction(SIGHUP, &sa, NULL);
2453         if (error != 0)
2454                 log_err(1, "sigaction");
2455
2456         sa.sa_handler = sigterm_handler;
2457         error = sigaction(SIGTERM, &sa, NULL);
2458         if (error != 0)
2459                 log_err(1, "sigaction");
2460
2461         sa.sa_handler = sigterm_handler;
2462         error = sigaction(SIGINT, &sa, NULL);
2463         if (error != 0)
2464                 log_err(1, "sigaction");
2465
2466         sa.sa_handler = sigchld_handler;
2467         error = sigaction(SIGCHLD, &sa, NULL);
2468         if (error != 0)
2469                 log_err(1, "sigaction");
2470 }
2471
2472 int
2473 main(int argc, char **argv)
2474 {
2475         struct conf *oldconf, *newconf, *tmpconf;
2476         struct isns *newns;
2477         const char *config_path = DEFAULT_CONFIG_PATH;
2478         int debug = 0, ch, error;
2479         bool dont_daemonize = false;
2480
2481         while ((ch = getopt(argc, argv, "df:R")) != -1) {
2482                 switch (ch) {
2483                 case 'd':
2484                         dont_daemonize = true;
2485                         debug++;
2486                         break;
2487                 case 'f':
2488                         config_path = optarg;
2489                         break;
2490                 case 'R':
2491 #ifndef ICL_KERNEL_PROXY
2492                         log_errx(1, "ctld(8) compiled without ICL_KERNEL_PROXY "
2493                             "does not support iSER protocol");
2494 #endif
2495                         proxy_mode = true;
2496                         break;
2497                 case '?':
2498                 default:
2499                         usage();
2500                 }
2501         }
2502         argc -= optind;
2503         if (argc != 0)
2504                 usage();
2505
2506         log_init(debug);
2507         kernel_init();
2508
2509         oldconf = conf_new_from_kernel();
2510         newconf = conf_new_from_file(config_path, oldconf);
2511         if (newconf == NULL)
2512                 log_errx(1, "configuration error; exiting");
2513         if (debug > 0) {
2514                 oldconf->conf_debug = debug;
2515                 newconf->conf_debug = debug;
2516         }
2517
2518         error = conf_apply(oldconf, newconf);
2519         if (error != 0)
2520                 log_errx(1, "failed to apply configuration; exiting");
2521
2522         conf_delete(oldconf);
2523         oldconf = NULL;
2524
2525         register_signals();
2526
2527         if (dont_daemonize == false) {
2528                 log_debugx("daemonizing");
2529                 if (daemon(0, 0) == -1) {
2530                         log_warn("cannot daemonize");
2531                         pidfile_remove(newconf->conf_pidfh);
2532                         exit(1);
2533                 }
2534         }
2535
2536         /* Schedule iSNS update */
2537         if (!TAILQ_EMPTY(&newconf->conf_isns))
2538                 set_timeout((newconf->conf_isns_period + 2) / 3, false);
2539
2540         for (;;) {
2541                 main_loop(newconf, dont_daemonize);
2542                 if (sighup_received) {
2543                         sighup_received = false;
2544                         log_debugx("received SIGHUP, reloading configuration");
2545                         tmpconf = conf_new_from_file(config_path, newconf);
2546                         if (tmpconf == NULL) {
2547                                 log_warnx("configuration error, "
2548                                     "continuing with old configuration");
2549                         } else {
2550                                 if (debug > 0)
2551                                         tmpconf->conf_debug = debug;
2552                                 oldconf = newconf;
2553                                 newconf = tmpconf;
2554                                 error = conf_apply(oldconf, newconf);
2555                                 if (error != 0)
2556                                         log_warnx("failed to reload "
2557                                             "configuration");
2558                                 conf_delete(oldconf);
2559                                 oldconf = NULL;
2560                         }
2561                 } else if (sigterm_received) {
2562                         log_debugx("exiting on signal; "
2563                             "reloading empty configuration");
2564
2565                         log_debugx("removing CTL iSCSI ports "
2566                             "and terminating all connections");
2567
2568                         oldconf = newconf;
2569                         newconf = conf_new();
2570                         if (debug > 0)
2571                                 newconf->conf_debug = debug;
2572                         error = conf_apply(oldconf, newconf);
2573                         if (error != 0)
2574                                 log_warnx("failed to apply configuration");
2575                         conf_delete(oldconf);
2576                         oldconf = NULL;
2577
2578                         log_warnx("exiting on signal");
2579                         exit(0);
2580                 } else {
2581                         nchildren -= wait_for_children(false);
2582                         assert(nchildren >= 0);
2583                         if (timed_out()) {
2584                                 set_timeout(0, false);
2585                                 TAILQ_FOREACH(newns, &newconf->conf_isns, i_next)
2586                                         isns_check(newns);
2587                                 /* Schedule iSNS update */
2588                                 if (!TAILQ_EMPTY(&newconf->conf_isns)) {
2589                                         set_timeout((newconf->conf_isns_period
2590                                             + 2) / 3,
2591                                             false);
2592                                 }
2593                         }
2594                 }
2595         }
2596         /* NOTREACHED */
2597 }