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