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_options);
 619         TAILQ_INIT(&pg->pg_portals);
 620         TAILQ_INIT(&pg->pg_ports);
 621         pg->pg_conf = conf;
 622         pg->pg_tag = 0;         /* Assigned later in conf_apply(). */
 623         TAILQ_INSERT_TAIL(&conf->conf_portal_groups, pg, pg_next);
 624
 625         return (pg);
 626 }
 627
 628 void
 629 portal_group_delete(struct portal_group *pg)
 630 {
 631         struct portal *portal, *tmp;
 632         struct port *port, *tport;
 633         struct option *o, *otmp;
 634
 635         TAILQ_FOREACH_SAFE(port, &pg->pg_ports, p_pgs, tport)
 636                 port_delete(port);
 637         TAILQ_REMOVE(&pg->pg_conf->conf_portal_groups, pg, pg_next);
 638
 639         TAILQ_FOREACH_SAFE(portal, &pg->pg_portals, p_next, tmp)
 640                 portal_delete(portal);
 641         TAILQ_FOREACH_SAFE(o, &pg->pg_options, o_next, otmp)
 642                 option_delete(&pg->pg_options, o);
 643         free(pg->pg_name);
 644         free(pg->pg_redirection);
 645         free(pg);
 646 }
 647
 648 struct portal_group *
 649 portal_group_find(const struct conf *conf, const char *name)
 650 {
 651         struct portal_group *pg;
 652
 653         TAILQ_FOREACH(pg, &conf->conf_portal_groups, pg_next) {
 654                 if (strcmp(pg->pg_name, name) == 0)
 655                         return (pg);
 656         }
 657
 658         return (NULL);
 659 }
 660
 661 static int
 662 parse_addr_port(char *arg, const char *def_port, struct addrinfo **ai)
 663 {
 664         struct addrinfo hints;
 665         char *str, *addr, *ch;
 666         const char *port;
 667         int error, colons = 0;
 668
 669         str = arg = strdup(arg);
 670         if (arg[0] == '[') {
 671                 /*
 672                  * IPv6 address in square brackets, perhaps with port.
 673                  */
 674                 arg++;
 675                 addr = strsep(&arg, "]");
 676                 if (arg == NULL)
 677                         return (1);
 678                 if (arg[0] == '\0') {
 679                         port = def_port;
 680                 } else if (arg[0] == ':') {
 681                         port = arg + 1;
 682                 } else {
 683                         free(str);
 684                         return (1);
 685                 }
 686         } else {
 687                 /*
 688                  * Either IPv6 address without brackets - and without
 689                  * a port - or IPv4 address.  Just count the colons.
 690                  */
 691                 for (ch = arg; *ch != '\0'; ch++) {
 692                         if (*ch == ':')
 693                                 colons++;
 694                 }
 695                 if (colons > 1) {
 696                         addr = arg;
 697                         port = def_port;
 698                 } else {
 699                         addr = strsep(&arg, ":");
 700                         if (arg == NULL)
 701                                 port = def_port;
 702                         else
 703                                 port = arg;
 704                 }
 705         }
 706
 707         memset(&hints, 0, sizeof(hints));
 708         hints.ai_family = PF_UNSPEC;
 709         hints.ai_socktype = SOCK_STREAM;
 710         hints.ai_flags = AI_PASSIVE;
 711         error = getaddrinfo(addr, port, &hints, ai);
 712         free(str);
 713         return ((error != 0) ? 1 : 0);
 714 }
 715
 716 int
 717 portal_group_add_listen(struct portal_group *pg, const char *value, bool iser)
 718 {
 719         struct portal *portal;
 720
 721         portal = portal_new(pg);
 722         portal->p_listen = checked_strdup(value);
 723         portal->p_iser = iser;
 724
 725         if (parse_addr_port(portal->p_listen, "3260", &portal->p_ai)) {
 726                 log_warnx("invalid listen address %s", portal->p_listen);
 727                 portal_delete(portal);
 728                 return (1);
 729         }
 730
 731         /*
 732          * XXX: getaddrinfo(3) may return multiple addresses; we should turn
 733          *      those into multiple portals.
 734          */
 735
 736         return (0);
 737 }
 738
 739 int
 740 isns_new(struct conf *conf, const char *addr)
 741 {
 742         struct isns *isns;
 743
 744         isns = calloc(1, sizeof(*isns));
 745         if (isns == NULL)
 746                 log_err(1, "calloc");
 747         isns->i_conf = conf;
 748         TAILQ_INSERT_TAIL(&conf->conf_isns, isns, i_next);
 749         isns->i_addr = checked_strdup(addr);
 750
 751         if (parse_addr_port(isns->i_addr, "3205", &isns->i_ai)) {
 752                 log_warnx("invalid iSNS address %s", isns->i_addr);
 753                 isns_delete(isns);
 754                 return (1);
 755         }
 756
 757         /*
 758          * XXX: getaddrinfo(3) may return multiple addresses; we should turn
 759          *      those into multiple servers.
 760          */
 761
 762         return (0);
 763 }
 764
 765 void
 766 isns_delete(struct isns *isns)
 767 {
 768
 769         TAILQ_REMOVE(&isns->i_conf->conf_isns, isns, i_next);
 770         free(isns->i_addr);
 771         if (isns->i_ai != NULL)
 772                 freeaddrinfo(isns->i_ai);
 773         free(isns);
 774 }
 775
 776 static int
 777 isns_do_connect(struct isns *isns)
 778 {
 779         int s;
 780
 781         s = socket(isns->i_ai->ai_family, isns->i_ai->ai_socktype,
 782             isns->i_ai->ai_protocol);
 783         if (s < 0) {
 784                 log_warn("socket(2) failed for %s", isns->i_addr);
 785                 return (-1);
 786         }
 787         if (connect(s, isns->i_ai->ai_addr, isns->i_ai->ai_addrlen)) {
 788                 log_warn("connect(2) failed for %s", isns->i_addr);
 789                 close(s);
 790                 return (-1);
 791         }
 792         return(s);
 793 }
 794
 795 static int
 796 isns_do_register(struct isns *isns, int s, const char *hostname)
 797 {
 798         struct conf *conf = isns->i_conf;
 799         struct target *target;
 800         struct portal *portal;
 801         struct portal_group *pg;
 802         struct port *port;
 803         struct isns_req *req;
 804         int res = 0;
 805         uint32_t error;
 806
 807         req = isns_req_create(ISNS_FUNC_DEVATTRREG, ISNS_FLAG_CLIENT);
 808         isns_req_add_str(req, 32, TAILQ_FIRST(&conf->conf_targets)->t_name);
 809         isns_req_add_delim(req);
 810         isns_req_add_str(req, 1, hostname);
 811         isns_req_add_32(req, 2, 2); /* 2 -- iSCSI */
 812         isns_req_add_32(req, 6, conf->conf_isns_period);
 813         TAILQ_FOREACH(pg, &conf->conf_portal_groups, pg_next) {
 814                 if (pg->pg_unassigned)
 815                         continue;
 816                 TAILQ_FOREACH(portal, &pg->pg_portals, p_next) {
 817                         isns_req_add_addr(req, 16, portal->p_ai);
 818                         isns_req_add_port(req, 17, portal->p_ai);
 819                 }
 820         }
 821         TAILQ_FOREACH(target, &conf->conf_targets, t_next) {
 822                 isns_req_add_str(req, 32, target->t_name);
 823                 isns_req_add_32(req, 33, 1); /* 1 -- Target*/
 824                 if (target->t_alias != NULL)
 825                         isns_req_add_str(req, 34, target->t_alias);
 826                 TAILQ_FOREACH(port, &target->t_ports, p_ts) {
 827                         if ((pg = port->p_portal_group) == NULL)
 828                                 continue;
 829                         isns_req_add_32(req, 51, pg->pg_tag);
 830                         TAILQ_FOREACH(portal, &pg->pg_portals, p_next) {
 831                                 isns_req_add_addr(req, 49, portal->p_ai);
 832                                 isns_req_add_port(req, 50, portal->p_ai);
 833                         }
 834                 }
 835         }
 836         res = isns_req_send(s, req);
 837         if (res < 0) {
 838                 log_warn("send(2) failed for %s", isns->i_addr);
 839                 goto quit;
 840         }
 841         res = isns_req_receive(s, req);
 842         if (res < 0) {
 843                 log_warn("receive(2) failed for %s", isns->i_addr);
 844                 goto quit;
 845         }
 846         error = isns_req_get_status(req);
 847         if (error != 0) {
 848                 log_warnx("iSNS register error %d for %s", error, isns->i_addr);
 849                 res = -1;
 850         }
 851 quit:
 852         isns_req_free(req);
 853         return (res);
 854 }
 855
 856 static int
 857 isns_do_check(struct isns *isns, int s, const char *hostname)
 858 {
 859         struct conf *conf = isns->i_conf;
 860         struct isns_req *req;
 861         int res = 0;
 862         uint32_t error;
 863
 864         req = isns_req_create(ISNS_FUNC_DEVATTRQRY, ISNS_FLAG_CLIENT);
 865         isns_req_add_str(req, 32, TAILQ_FIRST(&conf->conf_targets)->t_name);
 866         isns_req_add_str(req, 1, hostname);
 867         isns_req_add_delim(req);
 868         isns_req_add(req, 2, 0, NULL);
 869         res = isns_req_send(s, req);
 870         if (res < 0) {
 871                 log_warn("send(2) failed for %s", isns->i_addr);
 872                 goto quit;
 873         }
 874         res = isns_req_receive(s, req);
 875         if (res < 0) {
 876                 log_warn("receive(2) failed for %s", isns->i_addr);
 877                 goto quit;
 878         }
 879         error = isns_req_get_status(req);
 880         if (error != 0) {
 881                 log_warnx("iSNS check error %d for %s", error, isns->i_addr);
 882                 res = -1;
 883         }
 884 quit:
 885         isns_req_free(req);
 886         return (res);
 887 }
 888
 889 static int
 890 isns_do_deregister(struct isns *isns, int s, const char *hostname)
 891 {
 892         struct conf *conf = isns->i_conf;
 893         struct isns_req *req;
 894         int res = 0;
 895         uint32_t error;
 896
 897         req = isns_req_create(ISNS_FUNC_DEVDEREG, ISNS_FLAG_CLIENT);
 898         isns_req_add_str(req, 32, TAILQ_FIRST(&conf->conf_targets)->t_name);
 899         isns_req_add_delim(req);
 900         isns_req_add_str(req, 1, hostname);
 901         res = isns_req_send(s, req);
 902         if (res < 0) {
 903                 log_warn("send(2) failed for %s", isns->i_addr);
 904                 goto quit;
 905         }
 906         res = isns_req_receive(s, req);
 907         if (res < 0) {
 908                 log_warn("receive(2) failed for %s", isns->i_addr);
 909                 goto quit;
 910         }
 911         error = isns_req_get_status(req);
 912         if (error != 0) {
 913                 log_warnx("iSNS deregister error %d for %s", error, isns->i_addr);
 914                 res = -1;
 915         }
 916 quit:
 917         isns_req_free(req);
 918         return (res);
 919 }
 920
 921 void
 922 isns_register(struct isns *isns, struct isns *oldisns)
 923 {
 924         struct conf *conf = isns->i_conf;
 925         int s;
 926         char hostname[256];
 927
 928         if (TAILQ_EMPTY(&conf->conf_targets) ||
 929             TAILQ_EMPTY(&conf->conf_portal_groups))
 930                 return;
 931         set_timeout(conf->conf_isns_timeout, false);
 932         s = isns_do_connect(isns);
 933         if (s < 0) {
 934                 set_timeout(0, false);
 935                 return;
 936         }
 937         gethostname(hostname, sizeof(hostname));
 938
 939         if (oldisns == NULL || TAILQ_EMPTY(&oldisns->i_conf->conf_targets))
 940                 oldisns = isns;
 941         isns_do_deregister(oldisns, s, hostname);
 942         isns_do_register(isns, s, hostname);
 943         close(s);
 944         set_timeout(0, false);
 945 }
 946
 947 void
 948 isns_check(struct isns *isns)
 949 {
 950         struct conf *conf = isns->i_conf;
 951         int s, res;
 952         char hostname[256];
 953
 954         if (TAILQ_EMPTY(&conf->conf_targets) ||
 955             TAILQ_EMPTY(&conf->conf_portal_groups))
 956                 return;
 957         set_timeout(conf->conf_isns_timeout, false);
 958         s = isns_do_connect(isns);
 959         if (s < 0) {
 960                 set_timeout(0, false);
 961                 return;
 962         }
 963         gethostname(hostname, sizeof(hostname));
 964
 965         res = isns_do_check(isns, s, hostname);
 966         if (res < 0) {
 967                 isns_do_deregister(isns, s, hostname);
 968                 isns_do_register(isns, s, hostname);
 969         }
 970         close(s);
 971         set_timeout(0, false);
 972 }
 973
 974 void
 975 isns_deregister(struct isns *isns)
 976 {
 977         struct conf *conf = isns->i_conf;
 978         int s;
 979         char hostname[256];
 980
 981         if (TAILQ_EMPTY(&conf->conf_targets) ||
 982             TAILQ_EMPTY(&conf->conf_portal_groups))
 983                 return;
 984         set_timeout(conf->conf_isns_timeout, false);
 985         s = isns_do_connect(isns);
 986         if (s < 0)
 987                 return;
 988         gethostname(hostname, sizeof(hostname));
 989
 990         isns_do_deregister(isns, s, hostname);
 991         close(s);
 992         set_timeout(0, false);
 993 }
 994
 995 int
 996 portal_group_set_filter(struct portal_group *pg, const char *str)
 997 {
 998         int filter;
 999
1000         if (strcmp(str, "none") == 0) {
1001                 filter = PG_FILTER_NONE;
1002         } else if (strcmp(str, "portal") == 0) {
1003                 filter = PG_FILTER_PORTAL;
1004         } else if (strcmp(str, "portal-name") == 0) {
1005                 filter = PG_FILTER_PORTAL_NAME;
1006         } else if (strcmp(str, "portal-name-auth") == 0) {
1007                 filter = PG_FILTER_PORTAL_NAME_AUTH;
1008         } else {
1009                 log_warnx("invalid discovery-filter \"%s\" for portal-group "
1010                     "\"%s\"; valid values are \"none\", \"portal\", "
1011                     "\"portal-name\", and \"portal-name-auth\"",
1012                     str, pg->pg_name);
1013                 return (1);
1014         }
1015
1016         if (pg->pg_discovery_filter != PG_FILTER_UNKNOWN &&
1017             pg->pg_discovery_filter != filter) {
1018                 log_warnx("cannot set discovery-filter to \"%s\" for "
1019                     "portal-group \"%s\"; already has a different "
1020                     "value", str, pg->pg_name);
1021                 return (1);
1022         }
1023
1024         pg->pg_discovery_filter = filter;
1025
1026         return (0);
1027 }
1028
1029 int
1030 portal_group_set_redirection(struct portal_group *pg, const char *addr)
1031 {
1032
1033         if (pg->pg_redirection != NULL) {
1034                 log_warnx("cannot set redirection to \"%s\" for "
1035                     "portal-group \"%s\"; already defined",
1036                     addr, pg->pg_name);
1037                 return (1);
1038         }
1039
1040         pg->pg_redirection = checked_strdup(addr);
1041
1042         return (0);
1043 }
1044
1045 static bool
1046 valid_hex(const char ch)
1047 {
1048         switch (ch) {
1049         case '0':
1050         case '1':
1051         case '2':
1052         case '3':
1053         case '4':
1054         case '5':
1055         case '6':
1056         case '7':
1057         case '8':
1058         case '9':
1059         case 'a':
1060         case 'A':
1061         case 'b':
1062         case 'B':
1063         case 'c':
1064         case 'C':
1065         case 'd':
1066         case 'D':
1067         case 'e':
1068         case 'E':
1069         case 'f':
1070         case 'F':
1071                 return (true);
1072         default:
1073                 return (false);
1074         }
1075 }
1076
1077 bool
1078 valid_iscsi_name(const char *name)
1079 {
1080         int i;
1081
1082         if (strlen(name) >= MAX_NAME_LEN) {
1083                 log_warnx("overlong name for target \"%s\"; max length allowed "
1084                     "by iSCSI specification is %d characters",
1085                     name, MAX_NAME_LEN);
1086                 return (false);
1087         }
1088
1089         /*
1090          * In the cases below, we don't return an error, just in case the admin
1091          * was right, and we're wrong.
1092          */
1093         if (strncasecmp(name, "iqn.", strlen("iqn.")) == 0) {
1094                 for (i = strlen("iqn."); name[i] != '\0'; i++) {
1095                         /*
1096                          * XXX: We should verify UTF-8 normalisation, as defined
1097                          *      by 3.2.6.2: iSCSI Name Encoding.
1098                          */
1099                         if (isalnum(name[i]))
1100                                 continue;
1101                         if (name[i] == '-' || name[i] == '.' || name[i] == ':')
1102                                 continue;
1103                         log_warnx("invalid character \"%c\" in target name "
1104                             "\"%s\"; allowed characters are letters, digits, "
1105                             "'-', '.', and ':'", name[i], name);
1106                         break;
1107                 }
1108                 /*
1109                  * XXX: Check more stuff: valid date and a valid reversed domain.
1110                  */
1111         } else if (strncasecmp(name, "eui.", strlen("eui.")) == 0) {
1112                 if (strlen(name) != strlen("eui.") + 16)
1113                         log_warnx("invalid target name \"%s\"; the \"eui.\" "
1114                             "should be followed by exactly 16 hexadecimal "
1115                             "digits", name);
1116                 for (i = strlen("eui."); name[i] != '\0'; i++) {
1117                         if (!valid_hex(name[i])) {
1118                                 log_warnx("invalid character \"%c\" in target "
1119                                     "name \"%s\"; allowed characters are 1-9 "
1120                                     "and A-F", name[i], name);
1121                                 break;
1122                         }
1123                 }
1124         } else if (strncasecmp(name, "naa.", strlen("naa.")) == 0) {
1125                 if (strlen(name) > strlen("naa.") + 32)
1126                         log_warnx("invalid target name \"%s\"; the \"naa.\" "
1127                             "should be followed by at most 32 hexadecimal "
1128                             "digits", name);
1129                 for (i = strlen("naa."); name[i] != '\0'; i++) {
1130                         if (!valid_hex(name[i])) {
1131                                 log_warnx("invalid character \"%c\" in target "
1132                                     "name \"%s\"; allowed characters are 1-9 "
1133                                     "and A-F", name[i], name);
1134                                 break;
1135                         }
1136                 }
1137         } else {
1138                 log_warnx("invalid target name \"%s\"; should start with "
1139                     "either \"iqn.\", \"eui.\", or \"naa.\"",
1140                     name);
1141         }
1142         return (true);
1143 }
1144
1145 struct pport *
1146 pport_new(struct conf *conf, const char *name, uint32_t ctl_port)
1147 {
1148         struct pport *pp;
1149
1150         pp = calloc(1, sizeof(*pp));
1151         if (pp == NULL)
1152                 log_err(1, "calloc");
1153         pp->pp_conf = conf;
1154         pp->pp_name = checked_strdup(name);
1155         pp->pp_ctl_port = ctl_port;
1156         TAILQ_INIT(&pp->pp_ports);
1157         TAILQ_INSERT_TAIL(&conf->conf_pports, pp, pp_next);
1158         return (pp);
1159 }
1160
1161 struct pport *
1162 pport_find(const struct conf *conf, const char *name)
1163 {
1164         struct pport *pp;
1165
1166         TAILQ_FOREACH(pp, &conf->conf_pports, pp_next) {
1167                 if (strcasecmp(pp->pp_name, name) == 0)
1168                         return (pp);
1169         }
1170         return (NULL);
1171 }
1172
1173 struct pport *
1174 pport_copy(struct pport *pp, struct conf *conf)
1175 {
1176         struct pport *ppnew;
1177
1178         ppnew = pport_new(conf, pp->pp_name, pp->pp_ctl_port);
1179         return (ppnew);
1180 }
1181
1182 void
1183 pport_delete(struct pport *pp)
1184 {
1185         struct port *port, *tport;
1186
1187         TAILQ_FOREACH_SAFE(port, &pp->pp_ports, p_ts, tport)
1188                 port_delete(port);
1189         TAILQ_REMOVE(&pp->pp_conf->conf_pports, pp, pp_next);
1190         free(pp->pp_name);
1191         free(pp);
1192 }
1193
1194 struct port *
1195 port_new(struct conf *conf, struct target *target, struct portal_group *pg)
1196 {
1197         struct port *port;
1198         char *name;
1199         int ret;
1200
1201         ret = asprintf(&name, "%s-%s", pg->pg_name, target->t_name);
1202         if (ret <= 0)
1203                 log_err(1, "asprintf");
1204         if (port_find(conf, name) != NULL) {
1205                 log_warnx("duplicate port \"%s\"", name);
1206                 free(name);
1207                 return (NULL);
1208         }
1209         port = calloc(1, sizeof(*port));
1210         if (port == NULL)
1211                 log_err(1, "calloc");
1212         port->p_conf = conf;
1213         port->p_name = name;
1214         TAILQ_INSERT_TAIL(&conf->conf_ports, port, p_next);
1215         TAILQ_INSERT_TAIL(&target->t_ports, port, p_ts);
1216         port->p_target = target;
1217         TAILQ_INSERT_TAIL(&pg->pg_ports, port, p_pgs);
1218         port->p_portal_group = pg;
1219         port->p_foreign = pg->pg_foreign;
1220         return (port);
1221 }
1222
1223 struct port *
1224 port_new_pp(struct conf *conf, struct target *target, struct pport *pp)
1225 {
1226         struct port *port;
1227         char *name;
1228         int ret;
1229
1230         ret = asprintf(&name, "%s-%s", pp->pp_name, target->t_name);
1231         if (ret <= 0)
1232                 log_err(1, "asprintf");
1233         if (port_find(conf, name) != NULL) {
1234                 log_warnx("duplicate port \"%s\"", name);
1235                 free(name);
1236                 return (NULL);
1237         }
1238         port = calloc(1, sizeof(*port));
1239         if (port == NULL)
1240                 log_err(1, "calloc");
1241         port->p_conf = conf;
1242         port->p_name = name;
1243         TAILQ_INSERT_TAIL(&conf->conf_ports, port, p_next);
1244         TAILQ_INSERT_TAIL(&target->t_ports, port, p_ts);
1245         port->p_target = target;
1246         TAILQ_INSERT_TAIL(&pp->pp_ports, port, p_pps);
1247         port->p_pport = pp;
1248         return (port);
1249 }
1250
1251 struct port *
1252 port_find(const struct conf *conf, const char *name)
1253 {
1254         struct port *port;
1255
1256         TAILQ_FOREACH(port, &conf->conf_ports, p_next) {
1257                 if (strcasecmp(port->p_name, name) == 0)
1258                         return (port);
1259         }
1260
1261         return (NULL);
1262 }
1263
1264 struct port *
1265 port_find_in_pg(const struct portal_group *pg, const char *target)
1266 {
1267         struct port *port;
1268
1269         TAILQ_FOREACH(port, &pg->pg_ports, p_pgs) {
1270                 if (strcasecmp(port->p_target->t_name, target) == 0)
1271                         return (port);
1272         }
1273
1274         return (NULL);
1275 }
1276
1277 void
1278 port_delete(struct port *port)
1279 {
1280
1281         if (port->p_portal_group)
1282                 TAILQ_REMOVE(&port->p_portal_group->pg_ports, port, p_pgs);
1283         if (port->p_pport)
1284                 TAILQ_REMOVE(&port->p_pport->pp_ports, port, p_pps);
1285         if (port->p_target)
1286                 TAILQ_REMOVE(&port->p_target->t_ports, port, p_ts);
1287         TAILQ_REMOVE(&port->p_conf->conf_ports, port, p_next);
1288         free(port->p_name);
1289         free(port);
1290 }
1291
1292 struct target *
1293 target_new(struct conf *conf, const char *name)
1294 {
1295         struct target *targ;
1296         int i, len;
1297
1298         targ = target_find(conf, name);
1299         if (targ != NULL) {
1300                 log_warnx("duplicated target \"%s\"", name);
1301                 return (NULL);
1302         }
1303         if (valid_iscsi_name(name) == false) {
1304                 log_warnx("target name \"%s\" is invalid", name);
1305                 return (NULL);
1306         }
1307         targ = calloc(1, sizeof(*targ));
1308         if (targ == NULL)
1309                 log_err(1, "calloc");
1310         targ->t_name = checked_strdup(name);
1311
1312         /*
1313          * RFC 3722 requires us to normalize the name to lowercase.
1314          */
1315         len = strlen(name);
1316         for (i = 0; i < len; i++)
1317                 targ->t_name[i] = tolower(targ->t_name[i]);
1318
1319         targ->t_conf = conf;
1320         TAILQ_INIT(&targ->t_ports);
1321         TAILQ_INSERT_TAIL(&conf->conf_targets, targ, t_next);
1322
1323         return (targ);
1324 }
1325
1326 void
1327 target_delete(struct target *targ)
1328 {
1329         struct port *port, *tport;
1330
1331         TAILQ_FOREACH_SAFE(port, &targ->t_ports, p_ts, tport)
1332                 port_delete(port);
1333         TAILQ_REMOVE(&targ->t_conf->conf_targets, targ, t_next);
1334
1335         free(targ->t_name);
1336         free(targ->t_redirection);
1337         free(targ);
1338 }
1339
1340 struct target *
1341 target_find(struct conf *conf, const char *name)
1342 {
1343         struct target *targ;
1344
1345         TAILQ_FOREACH(targ, &conf->conf_targets, t_next) {
1346                 if (strcasecmp(targ->t_name, name) == 0)
1347                         return (targ);
1348         }
1349
1350         return (NULL);
1351 }
1352
1353 int
1354 target_set_redirection(struct target *target, const char *addr)
1355 {
1356
1357         if (target->t_redirection != NULL) {
1358                 log_warnx("cannot set redirection to \"%s\" for "
1359                     "target \"%s\"; already defined",
1360                     addr, target->t_name);
1361                 return (1);
1362         }
1363
1364         target->t_redirection = checked_strdup(addr);
1365
1366         return (0);
1367 }
1368
1369 struct lun *
1370 lun_new(struct conf *conf, const char *name)
1371 {
1372         struct lun *lun;
1373
1374         lun = lun_find(conf, name);
1375         if (lun != NULL) {
1376                 log_warnx("duplicated lun \"%s\"", name);
1377                 return (NULL);
1378         }
1379
1380         lun = calloc(1, sizeof(*lun));
1381         if (lun == NULL)
1382                 log_err(1, "calloc");
1383         lun->l_conf = conf;
1384         lun->l_name = checked_strdup(name);
1385         TAILQ_INIT(&lun->l_options);
1386         TAILQ_INSERT_TAIL(&conf->conf_luns, lun, l_next);
1387         lun->l_ctl_lun = -1;
1388
1389         return (lun);
1390 }
1391
1392 void
1393 lun_delete(struct lun *lun)
1394 {
1395         struct target *targ;
1396         struct option *o, *tmp;
1397         int i;
1398
1399         TAILQ_FOREACH(targ, &lun->l_conf->conf_targets, t_next) {
1400                 for (i = 0; i < MAX_LUNS; i++) {
1401                         if (targ->t_luns[i] == lun)
1402                                 targ->t_luns[i] = NULL;
1403                 }
1404         }
1405         TAILQ_REMOVE(&lun->l_conf->conf_luns, lun, l_next);
1406
1407         TAILQ_FOREACH_SAFE(o, &lun->l_options, o_next, tmp)
1408                 option_delete(&lun->l_options, o);
1409         free(lun->l_name);
1410         free(lun->l_backend);
1411         free(lun->l_device_id);
1412         free(lun->l_path);
1413         free(lun->l_scsiname);
1414         free(lun->l_serial);
1415         free(lun);
1416 }
1417
1418 struct lun *
1419 lun_find(const struct conf *conf, const char *name)
1420 {
1421         struct lun *lun;
1422
1423         TAILQ_FOREACH(lun, &conf->conf_luns, l_next) {
1424                 if (strcmp(lun->l_name, name) == 0)
1425                         return (lun);
1426         }
1427
1428         return (NULL);
1429 }
1430
1431 void
1432 lun_set_backend(struct lun *lun, const char *value)
1433 {
1434         free(lun->l_backend);
1435         lun->l_backend = checked_strdup(value);
1436 }
1437
1438 void
1439 lun_set_blocksize(struct lun *lun, size_t value)
1440 {
1441
1442         lun->l_blocksize = value;
1443 }
1444
1445 void
1446 lun_set_device_type(struct lun *lun, uint8_t value)
1447 {
1448
1449         lun->l_device_type = value;
1450 }
1451
1452 void
1453 lun_set_device_id(struct lun *lun, const char *value)
1454 {
1455         free(lun->l_device_id);
1456         lun->l_device_id = checked_strdup(value);
1457 }
1458
1459 void
1460 lun_set_path(struct lun *lun, const char *value)
1461 {
1462         free(lun->l_path);
1463         lun->l_path = checked_strdup(value);
1464 }
1465
1466 void
1467 lun_set_scsiname(struct lun *lun, const char *value)
1468 {
1469         free(lun->l_scsiname);
1470         lun->l_scsiname = checked_strdup(value);
1471 }
1472
1473 void
1474 lun_set_serial(struct lun *lun, const char *value)
1475 {
1476         free(lun->l_serial);
1477         lun->l_serial = checked_strdup(value);
1478 }
1479
1480 void
1481 lun_set_size(struct lun *lun, size_t value)
1482 {
1483
1484         lun->l_size = value;
1485 }
1486
1487 void
1488 lun_set_ctl_lun(struct lun *lun, uint32_t value)
1489 {
1490
1491         lun->l_ctl_lun = value;
1492 }
1493
1494 struct option *
1495 option_new(struct options *options, const char *name, const char *value)
1496 {
1497         struct option *o;
1498
1499         o = option_find(options, name);
1500         if (o != NULL) {
1501                 log_warnx("duplicated option \"%s\"", name);
1502                 return (NULL);
1503         }
1504
1505         o = calloc(1, sizeof(*o));
1506         if (o == NULL)
1507                 log_err(1, "calloc");
1508         o->o_name = checked_strdup(name);
1509         o->o_value = checked_strdup(value);
1510         TAILQ_INSERT_TAIL(options, o, o_next);
1511
1512         return (o);
1513 }
1514
1515 void
1516 option_delete(struct options *options, struct option *o)
1517 {
1518
1519         TAILQ_REMOVE(options, o, o_next);
1520         free(o->o_name);
1521         free(o->o_value);
1522         free(o);
1523 }
1524
1525 struct option *
1526 option_find(const struct options *options, const char *name)
1527 {
1528         struct option *o;
1529
1530         TAILQ_FOREACH(o, options, o_next) {
1531                 if (strcmp(o->o_name, name) == 0)
1532                         return (o);
1533         }
1534
1535         return (NULL);
1536 }
1537
1538 void
1539 option_set(struct option *o, const char *value)
1540 {
1541
1542         free(o->o_value);
1543         o->o_value = checked_strdup(value);
1544 }
1545
1546 static struct connection *
1547 connection_new(struct portal *portal, int fd, const char *host,
1548     const struct sockaddr *client_sa)
1549 {
1550         struct connection *conn;
1551
1552         conn = calloc(1, sizeof(*conn));
1553         if (conn == NULL)
1554                 log_err(1, "calloc");
1555         conn->conn_portal = portal;
1556         conn->conn_socket = fd;
1557         conn->conn_initiator_addr = checked_strdup(host);
1558         memcpy(&conn->conn_initiator_sa, client_sa, client_sa->sa_len);
1559
1560         /*
1561          * Default values, from RFC 3720, section 12.
1562          */
1563         conn->conn_max_data_segment_length = 8192;
1564         conn->conn_max_burst_length = 262144;
1565         conn->conn_immediate_data = true;
1566
1567         return (conn);
1568 }
1569
1570 #if 0
1571 static void
1572 conf_print(struct conf *conf)
1573 {
1574         struct auth_group *ag;
1575         struct auth *auth;
1576         struct auth_name *auth_name;
1577         struct auth_portal *auth_portal;
1578         struct portal_group *pg;
1579         struct portal *portal;
1580         struct target *targ;
1581         struct lun *lun;
1582         struct option *o;
1583
1584         TAILQ_FOREACH(ag, &conf->conf_auth_groups, ag_next) {
1585                 fprintf(stderr, "auth-group %s {\n", ag->ag_name);
1586                 TAILQ_FOREACH(auth, &ag->ag_auths, a_next)
1587                         fprintf(stderr, "\t chap-mutual %s %s %s %s\n",
1588                             auth->a_user, auth->a_secret,
1589                             auth->a_mutual_user, auth->a_mutual_secret);
1590                 TAILQ_FOREACH(auth_name, &ag->ag_names, an_next)
1591                         fprintf(stderr, "\t initiator-name %s\n",
1592                             auth_name->an_initator_name);
1593                 TAILQ_FOREACH(auth_portal, &ag->ag_portals, an_next)
1594                         fprintf(stderr, "\t initiator-portal %s\n",
1595                             auth_portal->an_initator_portal);
1596                 fprintf(stderr, "}\n");
1597         }
1598         TAILQ_FOREACH(pg, &conf->conf_portal_groups, pg_next) {
1599                 fprintf(stderr, "portal-group %s {\n", pg->pg_name);
1600                 TAILQ_FOREACH(portal, &pg->pg_portals, p_next)
1601                         fprintf(stderr, "\t listen %s\n", portal->p_listen);
1602                 fprintf(stderr, "}\n");
1603         }
1604         TAILQ_FOREACH(lun, &conf->conf_luns, l_next) {
1605                 fprintf(stderr, "\tlun %s {\n", lun->l_name);
1606                 fprintf(stderr, "\t\tpath %s\n", lun->l_path);
1607                 TAILQ_FOREACH(o, &lun->l_options, o_next)
1608                         fprintf(stderr, "\t\toption %s %s\n",
1609                             lo->o_name, lo->o_value);
1610                 fprintf(stderr, "\t}\n");
1611         }
1612         TAILQ_FOREACH(targ, &conf->conf_targets, t_next) {
1613                 fprintf(stderr, "target %s {\n", targ->t_name);
1614                 if (targ->t_alias != NULL)
1615                         fprintf(stderr, "\t alias %s\n", targ->t_alias);
1616                 fprintf(stderr, "}\n");
1617         }
1618 }
1619 #endif
1620
1621 static int
1622 conf_verify_lun(struct lun *lun)
1623 {
1624         const struct lun *lun2;
1625
1626         if (lun->l_backend == NULL)
1627                 lun_set_backend(lun, "block");
1628         if (strcmp(lun->l_backend, "block") == 0) {
1629                 if (lun->l_path == NULL) {
1630                         log_warnx("missing path for lun \"%s\"",
1631                             lun->l_name);
1632                         return (1);
1633                 }
1634         } else if (strcmp(lun->l_backend, "ramdisk") == 0) {
1635                 if (lun->l_size == 0) {
1636                         log_warnx("missing size for ramdisk-backed lun \"%s\"",
1637                             lun->l_name);
1638                         return (1);
1639                 }
1640                 if (lun->l_path != NULL) {
1641                         log_warnx("path must not be specified "
1642                             "for ramdisk-backed lun \"%s\"",
1643                             lun->l_name);
1644                         return (1);
1645                 }
1646         }
1647         if (lun->l_blocksize == 0) {
1648                 if (lun->l_device_type == 5)
1649                         lun_set_blocksize(lun, DEFAULT_CD_BLOCKSIZE);
1650                 else
1651                         lun_set_blocksize(lun, DEFAULT_BLOCKSIZE);
1652         } else if (lun->l_blocksize < 0) {
1653                 log_warnx("invalid blocksize for lun \"%s\"; "
1654                     "must be larger than 0", lun->l_name);
1655                 return (1);
1656         }
1657         if (lun->l_size != 0 && lun->l_size % lun->l_blocksize != 0) {
1658                 log_warnx("invalid size for lun \"%s\"; "
1659                     "must be multiple of blocksize", lun->l_name);
1660                 return (1);
1661         }
1662         TAILQ_FOREACH(lun2, &lun->l_conf->conf_luns, l_next) {
1663                 if (lun == lun2)
1664                         continue;
1665                 if (lun->l_path != NULL && lun2->l_path != NULL &&
1666                     strcmp(lun->l_path, lun2->l_path) == 0) {
1667                         log_debugx("WARNING: path \"%s\" duplicated "
1668                             "between lun \"%s\", and "
1669                             "lun \"%s\"", lun->l_path,
1670                             lun->l_name, lun2->l_name);
1671                 }
1672         }
1673
1674         return (0);
1675 }
1676
1677 int
1678 conf_verify(struct conf *conf)
1679 {
1680         struct auth_group *ag;
1681         struct portal_group *pg;
1682         struct port *port;
1683         struct target *targ;
1684         struct lun *lun;
1685         bool found;
1686         int error, i;
1687
1688         if (conf->conf_pidfile_path == NULL)
1689                 conf->conf_pidfile_path = checked_strdup(DEFAULT_PIDFILE);
1690
1691         TAILQ_FOREACH(lun, &conf->conf_luns, l_next) {
1692                 error = conf_verify_lun(lun);
1693                 if (error != 0)
1694                         return (error);
1695         }
1696         TAILQ_FOREACH(targ, &conf->conf_targets, t_next) {
1697                 if (targ->t_auth_group == NULL) {
1698                         targ->t_auth_group = auth_group_find(conf,
1699                             "default");
1700                         assert(targ->t_auth_group != NULL);
1701                 }
1702                 if (TAILQ_EMPTY(&targ->t_ports)) {
1703                         pg = portal_group_find(conf, "default");
1704                         assert(pg != NULL);
1705                         port_new(conf, targ, pg);
1706                 }
1707                 found = false;
1708                 for (i = 0; i < MAX_LUNS; i++) {
1709                         if (targ->t_luns[i] != NULL)
1710                                 found = true;
1711                 }
1712                 if (!found && targ->t_redirection == NULL) {
1713                         log_warnx("no LUNs defined for target \"%s\"",
1714                             targ->t_name);
1715                 }
1716                 if (found && targ->t_redirection != NULL) {
1717                         log_debugx("target \"%s\" contains luns, "
1718                             " but configured for redirection",
1719                             targ->t_name);
1720                 }
1721         }
1722         TAILQ_FOREACH(pg, &conf->conf_portal_groups, pg_next) {
1723                 assert(pg->pg_name != NULL);
1724                 if (pg->pg_discovery_auth_group == NULL) {
1725                         pg->pg_discovery_auth_group =
1726                             auth_group_find(conf, "default");
1727                         assert(pg->pg_discovery_auth_group != NULL);
1728                 }
1729
1730                 if (pg->pg_discovery_filter == PG_FILTER_UNKNOWN)
1731                         pg->pg_discovery_filter = PG_FILTER_NONE;
1732
1733                 if (pg->pg_redirection != NULL) {
1734                         if (!TAILQ_EMPTY(&pg->pg_ports)) {
1735                                 log_debugx("portal-group \"%s\" assigned "
1736                                     "to target, but configured "
1737                                     "for redirection",
1738                                     pg->pg_name);
1739                         }
1740                         pg->pg_unassigned = false;
1741                 } else if (!TAILQ_EMPTY(&pg->pg_ports)) {
1742                         pg->pg_unassigned = false;
1743                 } else {
1744                         if (strcmp(pg->pg_name, "default") != 0)
1745                                 log_warnx("portal-group \"%s\" not assigned "
1746                                     "to any target", pg->pg_name);
1747                         pg->pg_unassigned = true;
1748                 }
1749         }
1750         TAILQ_FOREACH(ag, &conf->conf_auth_groups, ag_next) {
1751                 if (ag->ag_name == NULL)
1752                         assert(ag->ag_target != NULL);
1753                 else
1754                         assert(ag->ag_target == NULL);
1755
1756                 found = false;
1757                 TAILQ_FOREACH(targ, &conf->conf_targets, t_next) {
1758                         if (targ->t_auth_group == ag) {
1759                                 found = true;
1760                                 break;
1761                         }
1762                 }
1763                 TAILQ_FOREACH(port, &conf->conf_ports, p_next) {
1764                         if (port->p_auth_group == ag) {
1765                                 found = true;
1766                                 break;
1767                         }
1768                 }
1769                 TAILQ_FOREACH(pg, &conf->conf_portal_groups, pg_next) {
1770                         if (pg->pg_discovery_auth_group == ag) {
1771                                 found = true;
1772                                 break;
1773                         }
1774                 }
1775                 if (!found && ag->ag_name != NULL &&
1776                     strcmp(ag->ag_name, "default") != 0 &&
1777                     strcmp(ag->ag_name, "no-authentication") != 0 &&
1778                     strcmp(ag->ag_name, "no-access") != 0) {
1779                         log_warnx("auth-group \"%s\" not assigned "
1780                             "to any target", ag->ag_name);
1781                 }
1782         }
1783
1784         return (0);
1785 }
1786
1787 static int
1788 conf_apply(struct conf *oldconf, struct conf *newconf)
1789 {
1790         struct lun *oldlun, *newlun, *tmplun;
1791         struct portal_group *oldpg, *newpg;
1792         struct portal *oldp, *newp;
1793         struct port *oldport, *newport, *tmpport;
1794         struct isns *oldns, *newns;
1795         pid_t otherpid;
1796         int changed, cumulated_error = 0, error, sockbuf;
1797         int one = 1;
1798
1799         if (oldconf->conf_debug != newconf->conf_debug) {
1800                 log_debugx("changing debug level to %d", newconf->conf_debug);
1801                 log_init(newconf->conf_debug);
1802         }
1803
1804         if (oldconf->conf_pidfh != NULL) {
1805                 assert(oldconf->conf_pidfile_path != NULL);
1806                 if (newconf->conf_pidfile_path != NULL &&
1807                     strcmp(oldconf->conf_pidfile_path,
1808                     newconf->conf_pidfile_path) == 0) {
1809                         newconf->conf_pidfh = oldconf->conf_pidfh;
1810                         oldconf->conf_pidfh = NULL;
1811                 } else {
1812                         log_debugx("removing pidfile %s",
1813                             oldconf->conf_pidfile_path);
1814                         pidfile_remove(oldconf->conf_pidfh);
1815                         oldconf->conf_pidfh = NULL;
1816                 }
1817         }
1818
1819         if (newconf->conf_pidfh == NULL && newconf->conf_pidfile_path != NULL) {
1820                 log_debugx("opening pidfile %s", newconf->conf_pidfile_path);
1821                 newconf->conf_pidfh =
1822                     pidfile_open(newconf->conf_pidfile_path, 0600, &otherpid);
1823                 if (newconf->conf_pidfh == NULL) {
1824                         if (errno == EEXIST)
1825                                 log_errx(1, "daemon already running, pid: %jd.",
1826                                     (intmax_t)otherpid);
1827                         log_err(1, "cannot open or create pidfile \"%s\"",
1828                             newconf->conf_pidfile_path);
1829                 }
1830         }
1831
1832         /*
1833          * Go through the new portal groups, assigning tags or preserving old.
1834          */
1835         TAILQ_FOREACH(newpg, &newconf->conf_portal_groups, pg_next) {
1836                 if (newpg->pg_tag != 0)
1837                         continue;
1838                 oldpg = portal_group_find(oldconf, newpg->pg_name);
1839                 if (oldpg != NULL)
1840                         newpg->pg_tag = oldpg->pg_tag;
1841                 else
1842                         newpg->pg_tag = ++last_portal_group_tag;
1843         }
1844
1845         /* Deregister on removed iSNS servers. */
1846         TAILQ_FOREACH(oldns, &oldconf->conf_isns, i_next) {
1847                 TAILQ_FOREACH(newns, &newconf->conf_isns, i_next) {
1848                         if (strcmp(oldns->i_addr, newns->i_addr) == 0)
1849                                 break;
1850                 }
1851                 if (newns == NULL)
1852                         isns_deregister(oldns);
1853         }
1854
1855         /*
1856          * XXX: If target or lun removal fails, we should somehow "move"
1857          *      the old lun or target into newconf, so that subsequent
1858          *      conf_apply() would try to remove them again.  That would
1859          *      be somewhat hairy, though, and lun deletion failures don't
1860          *      really happen, so leave it as it is for now.
1861          */
1862         /*
1863          * First, remove any ports present in the old configuration
1864          * and missing in the new one.
1865          */
1866         TAILQ_FOREACH_SAFE(oldport, &oldconf->conf_ports, p_next, tmpport) {
1867                 if (oldport->p_foreign)
1868                         continue;
1869                 newport = port_find(newconf, oldport->p_name);
1870                 if (newport != NULL && !newport->p_foreign)
1871                         continue;
1872                 log_debugx("removing port \"%s\"", oldport->p_name);
1873                 error = kernel_port_remove(oldport);
1874                 if (error != 0) {
1875                         log_warnx("failed to remove port %s",
1876                             oldport->p_name);
1877                         /*
1878                          * XXX: Uncomment after fixing the root cause.
1879                          *
1880                          * cumulated_error++;
1881                          */
1882                 }
1883         }
1884
1885         /*
1886          * Second, remove any LUNs present in the old configuration
1887          * and missing in the new one.
1888          */
1889         TAILQ_FOREACH_SAFE(oldlun, &oldconf->conf_luns, l_next, tmplun) {
1890                 newlun = lun_find(newconf, oldlun->l_name);
1891                 if (newlun == NULL) {
1892                         log_debugx("lun \"%s\", CTL lun %d "
1893                             "not found in new configuration; "
1894                             "removing", oldlun->l_name, oldlun->l_ctl_lun);
1895                         error = kernel_lun_remove(oldlun);
1896                         if (error != 0) {
1897                                 log_warnx("failed to remove lun \"%s\", "
1898                                     "CTL lun %d",
1899                                     oldlun->l_name, oldlun->l_ctl_lun);
1900                                 cumulated_error++;
1901                         }
1902                         continue;
1903                 }
1904
1905                 /*
1906                  * Also remove the LUNs changed by more than size.
1907                  */
1908                 changed = 0;
1909                 assert(oldlun->l_backend != NULL);
1910                 assert(newlun->l_backend != NULL);
1911                 if (strcmp(newlun->l_backend, oldlun->l_backend) != 0) {
1912                         log_debugx("backend for lun \"%s\", "
1913                             "CTL lun %d changed; removing",
1914                             oldlun->l_name, oldlun->l_ctl_lun);
1915                         changed = 1;
1916                 }
1917                 if (oldlun->l_blocksize != newlun->l_blocksize) {
1918                         log_debugx("blocksize for lun \"%s\", "
1919                             "CTL lun %d changed; removing",
1920                             oldlun->l_name, oldlun->l_ctl_lun);
1921                         changed = 1;
1922                 }
1923                 if (newlun->l_device_id != NULL &&
1924                     (oldlun->l_device_id == NULL ||
1925                      strcmp(oldlun->l_device_id, newlun->l_device_id) !=
1926                      0)) {
1927                         log_debugx("device-id for lun \"%s\", "
1928                             "CTL lun %d changed; removing",
1929                             oldlun->l_name, oldlun->l_ctl_lun);
1930                         changed = 1;
1931                 }
1932                 if (newlun->l_path != NULL &&
1933                     (oldlun->l_path == NULL ||
1934                      strcmp(oldlun->l_path, newlun->l_path) != 0)) {
1935                         log_debugx("path for lun \"%s\", "
1936                             "CTL lun %d, changed; removing",
1937                             oldlun->l_name, oldlun->l_ctl_lun);
1938                         changed = 1;
1939                 }
1940                 if (newlun->l_serial != NULL &&
1941                     (oldlun->l_serial == NULL ||
1942                      strcmp(oldlun->l_serial, newlun->l_serial) != 0)) {
1943                         log_debugx("serial for lun \"%s\", "
1944                             "CTL lun %d changed; removing",
1945                             oldlun->l_name, oldlun->l_ctl_lun);
1946                         changed = 1;
1947                 }
1948                 if (changed) {
1949                         error = kernel_lun_remove(oldlun);
1950                         if (error != 0) {
1951                                 log_warnx("failed to remove lun \"%s\", "
1952                                     "CTL lun %d",
1953                                     oldlun->l_name, oldlun->l_ctl_lun);
1954                                 cumulated_error++;
1955                         }
1956                         lun_delete(oldlun);
1957                         continue;
1958                 }
1959
1960                 lun_set_ctl_lun(newlun, oldlun->l_ctl_lun);
1961         }
1962
1963         TAILQ_FOREACH_SAFE(newlun, &newconf->conf_luns, l_next, tmplun) {
1964                 oldlun = lun_find(oldconf, newlun->l_name);
1965                 if (oldlun != NULL) {
1966                         log_debugx("modifying lun \"%s\", CTL lun %d",
1967                             newlun->l_name, newlun->l_ctl_lun);
1968                         error = kernel_lun_modify(newlun);
1969                         if (error != 0) {
1970                                 log_warnx("failed to "
1971                                     "modify lun \"%s\", CTL lun %d",
1972                                     newlun->l_name, newlun->l_ctl_lun);
1973                                 cumulated_error++;
1974                         }
1975                         continue;
1976                 }
1977                 log_debugx("adding lun \"%s\"", newlun->l_name);
1978                 error = kernel_lun_add(newlun);
1979                 if (error != 0) {
1980                         log_warnx("failed to add lun \"%s\"", newlun->l_name);
1981                         lun_delete(newlun);
1982                         cumulated_error++;
1983                 }
1984         }
1985
1986         /*
1987          * Now add new ports or modify existing ones.
1988          */
1989         TAILQ_FOREACH(newport, &newconf->conf_ports, p_next) {
1990                 if (newport->p_foreign)
1991                         continue;
1992                 oldport = port_find(oldconf, newport->p_name);
1993
1994                 if (oldport == NULL || oldport->p_foreign) {
1995                         log_debugx("adding port \"%s\"", newport->p_name);
1996                         error = kernel_port_add(newport);
1997                 } else {
1998                         log_debugx("updating port \"%s\"", newport->p_name);
1999                         newport->p_ctl_port = oldport->p_ctl_port;
2000                         error = kernel_port_update(newport, oldport);
2001                 }
2002                 if (error != 0) {
2003                         log_warnx("failed to %s port %s",
2004                             (oldport == NULL) ? "add" : "update",
2005                             newport->p_name);
2006                         /*
2007                          * XXX: Uncomment after fixing the root cause.
2008                          *
2009                          * cumulated_error++;
2010                          */
2011                 }
2012         }
2013
2014         /*
2015          * Go through the new portals, opening the sockets as necessary.
2016          */
2017         TAILQ_FOREACH(newpg, &newconf->conf_portal_groups, pg_next) {
2018                 if (newpg->pg_foreign)
2019                         continue;
2020                 if (newpg->pg_unassigned) {
2021                         log_debugx("not listening on portal-group \"%s\", "
2022                             "not assigned to any target",
2023                             newpg->pg_name);
2024                         continue;
2025                 }
2026                 TAILQ_FOREACH(newp, &newpg->pg_portals, p_next) {
2027                         /*
2028                          * Try to find already open portal and reuse
2029                          * the listening socket.  We don't care about
2030                          * what portal or portal group that was, what
2031                          * matters is the listening address.
2032                          */
2033                         TAILQ_FOREACH(oldpg, &oldconf->conf_portal_groups,
2034                             pg_next) {
2035                                 TAILQ_FOREACH(oldp, &oldpg->pg_portals,
2036                                     p_next) {
2037                                         if (strcmp(newp->p_listen,
2038                                             oldp->p_listen) == 0 &&
2039                                             oldp->p_socket > 0) {
2040                                                 newp->p_socket =
2041                                                     oldp->p_socket;
2042                                                 oldp->p_socket = 0;
2043                                                 break;
2044                                         }
2045                                 }
2046                         }
2047                         if (newp->p_socket > 0) {
2048                                 /*
2049                                  * We're done with this portal.
2050                                  */
2051                                 continue;
2052                         }
2053
2054 #ifdef ICL_KERNEL_PROXY
2055                         if (proxy_mode) {
2056                                 newpg->pg_conf->conf_portal_id++;
2057                                 newp->p_id = newpg->pg_conf->conf_portal_id;
2058                                 log_debugx("listening on %s, portal-group "
2059                                     "\"%s\", portal id %d, using ICL proxy",
2060                                     newp->p_listen, newpg->pg_name, newp->p_id);
2061                                 kernel_listen(newp->p_ai, newp->p_iser,
2062                                     newp->p_id);
2063                                 continue;
2064                         }
2065 #endif
2066                         assert(proxy_mode == false);
2067                         assert(newp->p_iser == false);
2068
2069                         log_debugx("listening on %s, portal-group \"%s\"",
2070                             newp->p_listen, newpg->pg_name);
2071                         newp->p_socket = socket(newp->p_ai->ai_family,
2072                             newp->p_ai->ai_socktype,
2073                             newp->p_ai->ai_protocol);
2074                         if (newp->p_socket < 0) {
2075                                 log_warn("socket(2) failed for %s",
2076                                     newp->p_listen);
2077                                 cumulated_error++;
2078                                 continue;
2079                         }
2080                         sockbuf = SOCKBUF_SIZE;
2081                         if (setsockopt(newp->p_socket, SOL_SOCKET, SO_RCVBUF,
2082                             &sockbuf, sizeof(sockbuf)) == -1)
2083                                 log_warn("setsockopt(SO_RCVBUF) failed "
2084                                     "for %s", newp->p_listen);
2085                         sockbuf = SOCKBUF_SIZE;
2086                         if (setsockopt(newp->p_socket, SOL_SOCKET, SO_SNDBUF,
2087                             &sockbuf, sizeof(sockbuf)) == -1)
2088                                 log_warn("setsockopt(SO_SNDBUF) failed "
2089                                     "for %s", newp->p_listen);
2090                         error = setsockopt(newp->p_socket, SOL_SOCKET,
2091                             SO_REUSEADDR, &one, sizeof(one));
2092                         if (error != 0) {
2093                                 log_warn("setsockopt(SO_REUSEADDR) failed "
2094                                     "for %s", newp->p_listen);
2095                                 close(newp->p_socket);
2096                                 newp->p_socket = 0;
2097                                 cumulated_error++;
2098                                 continue;
2099                         }
2100                         error = bind(newp->p_socket, newp->p_ai->ai_addr,
2101                             newp->p_ai->ai_addrlen);
2102                         if (error != 0) {
2103                                 log_warn("bind(2) failed for %s",
2104                                     newp->p_listen);
2105                                 close(newp->p_socket);
2106                                 newp->p_socket = 0;
2107                                 cumulated_error++;
2108                                 continue;
2109                         }
2110                         error = listen(newp->p_socket, -1);
2111                         if (error != 0) {
2112                                 log_warn("listen(2) failed for %s",
2113                                     newp->p_listen);
2114                                 close(newp->p_socket);
2115                                 newp->p_socket = 0;
2116                                 cumulated_error++;
2117                                 continue;
2118                         }
2119                 }
2120         }
2121
2122         /*
2123          * Go through the no longer used sockets, closing them.
2124          */
2125         TAILQ_FOREACH(oldpg, &oldconf->conf_portal_groups, pg_next) {
2126                 TAILQ_FOREACH(oldp, &oldpg->pg_portals, p_next) {
2127                         if (oldp->p_socket <= 0)
2128                                 continue;
2129                         log_debugx("closing socket for %s, portal-group \"%s\"",
2130                             oldp->p_listen, oldpg->pg_name);
2131                         close(oldp->p_socket);
2132                         oldp->p_socket = 0;
2133                 }
2134         }
2135
2136         /* (Re-)Register on remaining/new iSNS servers. */
2137         TAILQ_FOREACH(newns, &newconf->conf_isns, i_next) {
2138                 TAILQ_FOREACH(oldns, &oldconf->conf_isns, i_next) {
2139                         if (strcmp(oldns->i_addr, newns->i_addr) == 0)
2140                                 break;
2141                 }
2142                 isns_register(newns, oldns);
2143         }
2144
2145         /* Schedule iSNS update */
2146         if (!TAILQ_EMPTY(&newconf->conf_isns))
2147                 set_timeout((newconf->conf_isns_period + 2) / 3, false);
2148
2149         return (cumulated_error);
2150 }
2151
2152 bool
2153 timed_out(void)
2154 {
2155
2156         return (sigalrm_received);
2157 }
2158
2159 static void
2160 sigalrm_handler_fatal(int dummy __unused)
2161 {
2162         /*
2163          * It would be easiest to just log an error and exit.  We can't
2164          * do this, though, because log_errx() is not signal safe, since
2165          * it calls syslog(3).  Instead, set a flag checked by pdu_send()
2166          * and pdu_receive(), to call log_errx() there.  Should they fail
2167          * to notice, we'll exit here one second later.
2168          */
2169         if (sigalrm_received) {
2170                 /*
2171                  * Oh well.  Just give up and quit.
2172                  */
2173                 _exit(2);
2174         }
2175
2176         sigalrm_received = true;
2177 }
2178
2179 static void
2180 sigalrm_handler(int dummy __unused)
2181 {
2182
2183         sigalrm_received = true;
2184 }
2185
2186 void
2187 set_timeout(int timeout, int fatal)
2188 {
2189         struct sigaction sa;
2190         struct itimerval itv;
2191         int error;
2192
2193         if (timeout <= 0) {
2194                 log_debugx("session timeout disabled");
2195                 bzero(&itv, sizeof(itv));
2196                 error = setitimer(ITIMER_REAL, &itv, NULL);
2197                 if (error != 0)
2198                         log_err(1, "setitimer");
2199                 sigalrm_received = false;
2200                 return;
2201         }
2202
2203         sigalrm_received = false;
2204         bzero(&sa, sizeof(sa));
2205         if (fatal)
2206                 sa.sa_handler = sigalrm_handler_fatal;
2207         else
2208                 sa.sa_handler = sigalrm_handler;
2209         sigfillset(&sa.sa_mask);
2210         error = sigaction(SIGALRM, &sa, NULL);
2211         if (error != 0)
2212                 log_err(1, "sigaction");
2213
2214         /*
2215          * First SIGALRM will arive after conf_timeout seconds.
2216          * If we do nothing, another one will arrive a second later.
2217          */
2218         log_debugx("setting session timeout to %d seconds", timeout);
2219         bzero(&itv, sizeof(itv));
2220         itv.it_interval.tv_sec = 1;
2221         itv.it_value.tv_sec = timeout;
2222         error = setitimer(ITIMER_REAL, &itv, NULL);
2223         if (error != 0)
2224                 log_err(1, "setitimer");
2225 }
2226
2227 static int
2228 wait_for_children(bool block)
2229 {
2230         pid_t pid;
2231         int status;
2232         int num = 0;
2233
2234         for (;;) {
2235                 /*
2236                  * If "block" is true, wait for at least one process.
2237                  */
2238                 if (block && num == 0)
2239                         pid = wait4(-1, &status, 0, NULL);
2240                 else
2241                         pid = wait4(-1, &status, WNOHANG, NULL);
2242                 if (pid <= 0)
2243                         break;
2244                 if (WIFSIGNALED(status)) {
2245                         log_warnx("child process %d terminated with signal %d",
2246                             pid, WTERMSIG(status));
2247                 } else if (WEXITSTATUS(status) != 0) {
2248                         log_warnx("child process %d terminated with exit status %d",
2249                             pid, WEXITSTATUS(status));
2250                 } else {
2251                         log_debugx("child process %d terminated gracefully", pid);
2252                 }
2253                 num++;
2254         }
2255
2256         return (num);
2257 }
2258
2259 static void
2260 handle_connection(struct portal *portal, int fd,
2261     const struct sockaddr *client_sa, bool dont_fork)
2262 {
2263         struct connection *conn;
2264         int error;
2265         pid_t pid;
2266         char host[NI_MAXHOST + 1];
2267         struct conf *conf;
2268
2269         conf = portal->p_portal_group->pg_conf;
2270
2271         if (dont_fork) {
2272                 log_debugx("incoming connection; not forking due to -d flag");
2273         } else {
2274                 nchildren -= wait_for_children(false);
2275                 assert(nchildren >= 0);
2276
2277                 while (conf->conf_maxproc > 0 && nchildren >= conf->conf_maxproc) {
2278                         log_debugx("maxproc limit of %d child processes hit; "
2279                             "waiting for child process to exit", conf->conf_maxproc);
2280                         nchildren -= wait_for_children(true);
2281                         assert(nchildren >= 0);
2282                 }
2283                 log_debugx("incoming connection; forking child process #%d",
2284                     nchildren);
2285                 nchildren++;
2286                 pid = fork();
2287                 if (pid < 0)
2288                         log_err(1, "fork");
2289                 if (pid > 0) {
2290                         close(fd);
2291                         return;
2292                 }
2293         }
2294         pidfile_close(conf->conf_pidfh);
2295
2296         error = getnameinfo(client_sa, client_sa->sa_len,
2297             host, sizeof(host), NULL, 0, NI_NUMERICHOST);
2298         if (error != 0)
2299                 log_errx(1, "getnameinfo: %s", gai_strerror(error));
2300
2301         log_debugx("accepted connection from %s; portal group \"%s\"",
2302             host, portal->p_portal_group->pg_name);
2303         log_set_peer_addr(host);
2304         setproctitle("%s", host);
2305
2306         conn = connection_new(portal, fd, host, client_sa);
2307         set_timeout(conf->conf_timeout, true);
2308         kernel_capsicate();
2309         login(conn);
2310         if (conn->conn_session_type == CONN_SESSION_TYPE_NORMAL) {
2311                 kernel_handoff(conn);
2312                 log_debugx("connection handed off to the kernel");
2313         } else {
2314                 assert(conn->conn_session_type == CONN_SESSION_TYPE_DISCOVERY);
2315                 discovery(conn);
2316         }
2317         log_debugx("nothing more to do; exiting");
2318         exit(0);
2319 }
2320
2321 static int
2322 fd_add(int fd, fd_set *fdset, int nfds)
2323 {
2324
2325         /*
2326          * Skip sockets which we failed to bind.
2327          */
2328         if (fd <= 0)
2329                 return (nfds);
2330
2331         FD_SET(fd, fdset);
2332         if (fd > nfds)
2333                 nfds = fd;
2334         return (nfds);
2335 }
2336
2337 static void
2338 main_loop(struct conf *conf, bool dont_fork)
2339 {
2340         struct portal_group *pg;
2341         struct portal *portal;
2342         struct sockaddr_storage client_sa;
2343         socklen_t client_salen;
2344 #ifdef ICL_KERNEL_PROXY
2345         int connection_id;
2346         int portal_id;
2347 #endif
2348         fd_set fdset;
2349         int error, nfds, client_fd;
2350
2351         pidfile_write(conf->conf_pidfh);
2352
2353         for (;;) {
2354                 if (sighup_received || sigterm_received || timed_out())
2355                         return;
2356
2357 #ifdef ICL_KERNEL_PROXY
2358                 if (proxy_mode) {
2359                         client_salen = sizeof(client_sa);
2360                         kernel_accept(&connection_id, &portal_id,
2361                             (struct sockaddr *)&client_sa, &client_salen);
2362                         assert(client_salen >= client_sa.ss_len);
2363
2364                         log_debugx("incoming connection, id %d, portal id %d",
2365                             connection_id, portal_id);
2366                         TAILQ_FOREACH(pg, &conf->conf_portal_groups, pg_next) {
2367                                 TAILQ_FOREACH(portal, &pg->pg_portals, p_next) {
2368                                         if (portal->p_id == portal_id) {
2369                                                 goto found;
2370                                         }
2371                                 }
2372                         }
2373
2374                         log_errx(1, "kernel returned invalid portal_id %d",
2375                             portal_id);
2376
2377 found:
2378                         handle_connection(portal, connection_id,
2379                             (struct sockaddr *)&client_sa, dont_fork);
2380                 } else {
2381 #endif
2382                         assert(proxy_mode == false);
2383
2384                         FD_ZERO(&fdset);
2385                         nfds = 0;
2386                         TAILQ_FOREACH(pg, &conf->conf_portal_groups, pg_next) {
2387                                 TAILQ_FOREACH(portal, &pg->pg_portals, p_next)
2388                                         nfds = fd_add(portal->p_socket, &fdset, nfds);
2389                         }
2390                         error = select(nfds + 1, &fdset, NULL, NULL, NULL);
2391                         if (error <= 0) {
2392                                 if (errno == EINTR)
2393                                         return;
2394                                 log_err(1, "select");
2395                         }
2396                         TAILQ_FOREACH(pg, &conf->conf_portal_groups, pg_next) {
2397                                 TAILQ_FOREACH(portal, &pg->pg_portals, p_next) {
2398                                         if (!FD_ISSET(portal->p_socket, &fdset))
2399                                                 continue;
2400                                         client_salen = sizeof(client_sa);
2401                                         client_fd = accept(portal->p_socket,
2402                                             (struct sockaddr *)&client_sa,
2403                                             &client_salen);
2404                                         if (client_fd < 0) {
2405                                                 if (errno == ECONNABORTED)
2406                                                         continue;
2407                                                 log_err(1, "accept");
2408                                         }
2409                                         assert(client_salen >= client_sa.ss_len);
2410
2411                                         handle_connection(portal, client_fd,
2412                                             (struct sockaddr *)&client_sa,
2413                                             dont_fork);
2414                                         break;
2415                                 }
2416                         }
2417 #ifdef ICL_KERNEL_PROXY
2418                 }
2419 #endif
2420         }
2421 }
2422
2423 static void
2424 sighup_handler(int dummy __unused)
2425 {
2426
2427         sighup_received = true;
2428 }
2429
2430 static void
2431 sigterm_handler(int dummy __unused)
2432 {
2433
2434         sigterm_received = true;
2435 }
2436
2437 static void
2438 sigchld_handler(int dummy __unused)
2439 {
2440
2441         /*
2442          * The only purpose of this handler is to make SIGCHLD
2443          * interrupt the ISCSIDWAIT ioctl(2), so we can call
2444          * wait_for_children().
2445          */
2446 }
2447
2448 static void
2449 register_signals(void)
2450 {
2451         struct sigaction sa;
2452         int error;
2453
2454         bzero(&sa, sizeof(sa));
2455         sa.sa_handler = sighup_handler;
2456         sigfillset(&sa.sa_mask);
2457         error = sigaction(SIGHUP, &sa, NULL);
2458         if (error != 0)
2459                 log_err(1, "sigaction");
2460
2461         sa.sa_handler = sigterm_handler;
2462         error = sigaction(SIGTERM, &sa, NULL);
2463         if (error != 0)
2464                 log_err(1, "sigaction");
2465
2466         sa.sa_handler = sigterm_handler;
2467         error = sigaction(SIGINT, &sa, NULL);
2468         if (error != 0)
2469                 log_err(1, "sigaction");
2470
2471         sa.sa_handler = sigchld_handler;
2472         error = sigaction(SIGCHLD, &sa, NULL);
2473         if (error != 0)
2474                 log_err(1, "sigaction");
2475 }
2476
2477 int
2478 main(int argc, char **argv)
2479 {
2480         struct conf *oldconf, *newconf, *tmpconf;
2481         struct isns *newns;
2482         const char *config_path = DEFAULT_CONFIG_PATH;
2483         int debug = 0, ch, error;
2484         bool dont_daemonize = false;
2485
2486         while ((ch = getopt(argc, argv, "df:R")) != -1) {
2487                 switch (ch) {
2488                 case 'd':
2489                         dont_daemonize = true;
2490                         debug++;
2491                         break;
2492                 case 'f':
2493                         config_path = optarg;
2494                         break;
2495                 case 'R':
2496 #ifndef ICL_KERNEL_PROXY
2497                         log_errx(1, "ctld(8) compiled without ICL_KERNEL_PROXY "
2498                             "does not support iSER protocol");
2499 #endif
2500                         proxy_mode = true;
2501                         break;
2502                 case '?':
2503                 default:
2504                         usage();
2505                 }
2506         }
2507         argc -= optind;
2508         if (argc != 0)
2509                 usage();
2510
2511         log_init(debug);
2512         kernel_init();
2513
2514         oldconf = conf_new_from_kernel();
2515         newconf = conf_new_from_file(config_path, oldconf);
2516         if (newconf == NULL)
2517                 log_errx(1, "configuration error; exiting");
2518         if (debug > 0) {
2519                 oldconf->conf_debug = debug;
2520                 newconf->conf_debug = debug;
2521         }
2522
2523         error = conf_apply(oldconf, newconf);
2524         if (error != 0)
2525                 log_errx(1, "failed to apply configuration; exiting");
2526
2527         conf_delete(oldconf);
2528         oldconf = NULL;
2529
2530         register_signals();
2531
2532         if (dont_daemonize == false) {
2533                 log_debugx("daemonizing");
2534                 if (daemon(0, 0) == -1) {
2535                         log_warn("cannot daemonize");
2536                         pidfile_remove(newconf->conf_pidfh);
2537                         exit(1);
2538                 }
2539         }
2540
2541         /* Schedule iSNS update */
2542         if (!TAILQ_EMPTY(&newconf->conf_isns))
2543                 set_timeout((newconf->conf_isns_period + 2) / 3, false);
2544
2545         for (;;) {
2546                 main_loop(newconf, dont_daemonize);
2547                 if (sighup_received) {
2548                         sighup_received = false;
2549                         log_debugx("received SIGHUP, reloading configuration");
2550                         tmpconf = conf_new_from_file(config_path, newconf);
2551                         if (tmpconf == NULL) {
2552                                 log_warnx("configuration error, "
2553                                     "continuing with old configuration");
2554                         } else {
2555                                 if (debug > 0)
2556                                         tmpconf->conf_debug = debug;
2557                                 oldconf = newconf;
2558                                 newconf = tmpconf;
2559                                 error = conf_apply(oldconf, newconf);
2560                                 if (error != 0)
2561                                         log_warnx("failed to reload "
2562                                             "configuration");
2563                                 conf_delete(oldconf);
2564                                 oldconf = NULL;
2565                         }
2566                 } else if (sigterm_received) {
2567                         log_debugx("exiting on signal; "
2568                             "reloading empty configuration");
2569
2570                         log_debugx("removing CTL iSCSI ports "
2571                             "and terminating all connections");
2572
2573                         oldconf = newconf;
2574                         newconf = conf_new();
2575                         if (debug > 0)
2576                                 newconf->conf_debug = debug;
2577                         error = conf_apply(oldconf, newconf);
2578                         if (error != 0)
2579                                 log_warnx("failed to apply configuration");
2580                         conf_delete(oldconf);
2581                         oldconf = NULL;
2582
2583                         log_warnx("exiting on signal");
2584                         exit(0);
2585                 } else {
2586                         nchildren -= wait_for_children(false);
2587                         assert(nchildren >= 0);
2588                         if (timed_out()) {
2589                                 set_timeout(0, false);
2590                                 TAILQ_FOREACH(newns, &newconf->conf_isns, i_next)
2591                                         isns_check(newns);
2592                                 /* Schedule iSNS update */
2593                                 if (!TAILQ_EMPTY(&newconf->conf_isns)) {
2594                                         set_timeout((newconf->conf_isns_period
2595                                             + 2) / 3,
2596                                             false);
2597                                 }
2598                         }
2599                 }
2600         }
2601         /* NOTREACHED */
2602 }