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/stat.h>
  38 #include <sys/wait.h>
  39 #include <netinet/in.h>
  40 #include <arpa/inet.h>
  41 #include <assert.h>
  42 #include <ctype.h>
  43 #include <errno.h>
  44 #include <netdb.h>
  45 #include <signal.h>
  46 #include <stdbool.h>
  47 #include <stdio.h>
  48 #include <stdint.h>
  49 #include <stdlib.h>
  50 #include <string.h>
  51 #include <unistd.h>
  52
  53 #include "ctld.h"
  54 #include "isns.h"
  55
  56 bool proxy_mode = false;
  57
  58 static volatile bool sighup_received = false;
  59 static volatile bool sigterm_received = false;
  60 static volatile bool sigalrm_received = false;
  61
  62 static int nchildren = 0;
  63 static uint16_t last_portal_group_tag = 0xff;
  64
  65 static void
  66 usage(void)
  67 {
  68
  69         fprintf(stderr, "usage: ctld [-d][-u][-f config-file]\n");
  70         exit(1);
  71 }
  72
  73 char *
  74 checked_strdup(const char *s)
  75 {
  76         char *c;
  77
  78         c = strdup(s);
  79         if (c == NULL)
  80                 log_err(1, "strdup");
  81         return (c);
  82 }
  83
  84 struct conf *
  85 conf_new(void)
  86 {
  87         struct conf *conf;
  88
  89         conf = calloc(1, sizeof(*conf));
  90         if (conf == NULL)
  91                 log_err(1, "calloc");
  92         TAILQ_INIT(&conf->conf_luns);
  93         TAILQ_INIT(&conf->conf_targets);
  94         TAILQ_INIT(&conf->conf_auth_groups);
  95         TAILQ_INIT(&conf->conf_ports);
  96         TAILQ_INIT(&conf->conf_portal_groups);
  97         TAILQ_INIT(&conf->conf_pports);
  98         TAILQ_INIT(&conf->conf_isns);
  99
 100         conf->conf_isns_period = 900;
 101         conf->conf_isns_timeout = 5;
 102         conf->conf_debug = 0;
 103         conf->conf_timeout = 60;
 104         conf->conf_maxproc = 30;
 105
 106         return (conf);
 107 }
 108
 109 void
 110 conf_delete(struct conf *conf)
 111 {
 112         struct lun *lun, *ltmp;
 113         struct target *targ, *tmp;
 114         struct auth_group *ag, *cagtmp;
 115         struct portal_group *pg, *cpgtmp;
 116         struct pport *pp, *pptmp;
 117         struct isns *is, *istmp;
 118
 119         assert(conf->conf_pidfh == NULL);
 120
 121         TAILQ_FOREACH_SAFE(lun, &conf->conf_luns, l_next, ltmp)
 122                 lun_delete(lun);
 123         TAILQ_FOREACH_SAFE(targ, &conf->conf_targets, t_next, tmp)
 124                 target_delete(targ);
 125         TAILQ_FOREACH_SAFE(ag, &conf->conf_auth_groups, ag_next, cagtmp)
 126                 auth_group_delete(ag);
 127         TAILQ_FOREACH_SAFE(pg, &conf->conf_portal_groups, pg_next, cpgtmp)
 128                 portal_group_delete(pg);
 129         TAILQ_FOREACH_SAFE(pp, &conf->conf_pports, pp_next, pptmp)
 130                 pport_delete(pp);
 131         TAILQ_FOREACH_SAFE(is, &conf->conf_isns, i_next, istmp)
 132                 isns_delete(is);
 133         assert(TAILQ_EMPTY(&conf->conf_ports));
 134         free(conf->conf_pidfile_path);
 135         free(conf);
 136 }
 137
 138 static struct auth *
 139 auth_new(struct auth_group *ag)
 140 {
 141         struct auth *auth;
 142
 143         auth = calloc(1, sizeof(*auth));
 144         if (auth == NULL)
 145                 log_err(1, "calloc");
 146         auth->a_auth_group = ag;
 147         TAILQ_INSERT_TAIL(&ag->ag_auths, auth, a_next);
 148         return (auth);
 149 }
 150
 151 static void
 152 auth_delete(struct auth *auth)
 153 {
 154         TAILQ_REMOVE(&auth->a_auth_group->ag_auths, auth, a_next);
 155
 156         free(auth->a_user);
 157         free(auth->a_secret);
 158         free(auth->a_mutual_user);
 159         free(auth->a_mutual_secret);
 160         free(auth);
 161 }
 162
 163 const struct auth *
 164 auth_find(const struct auth_group *ag, const char *user)
 165 {
 166         const struct auth *auth;
 167
 168         TAILQ_FOREACH(auth, &ag->ag_auths, a_next) {
 169                 if (strcmp(auth->a_user, user) == 0)
 170                         return (auth);
 171         }
 172
 173         return (NULL);
 174 }
 175
 176 static void
 177 auth_check_secret_length(struct auth *auth)
 178 {
 179         size_t len;
 180
 181         len = strlen(auth->a_secret);
 182         if (len > 16) {
 183                 if (auth->a_auth_group->ag_name != NULL)
 184                         log_warnx("secret for user \"%s\", auth-group \"%s\", "
 185                             "is too long; it should be at most 16 characters "
 186                             "long", auth->a_user, auth->a_auth_group->ag_name);
 187                 else
 188                         log_warnx("secret for user \"%s\", target \"%s\", "
 189                             "is too long; it should be at most 16 characters "
 190                             "long", auth->a_user,
 191                             auth->a_auth_group->ag_target->t_name);
 192         }
 193         if (len < 12) {
 194                 if (auth->a_auth_group->ag_name != NULL)
 195                         log_warnx("secret for user \"%s\", auth-group \"%s\", "
 196                             "is too short; it should be at least 12 characters "
 197                             "long", auth->a_user,
 198                             auth->a_auth_group->ag_name);
 199                 else
 200                         log_warnx("secret for user \"%s\", target \"%s\", "
 201                             "is too short; it should be at least 12 characters "
 202                             "long", auth->a_user,
 203                             auth->a_auth_group->ag_target->t_name);
 204         }
 205
 206         if (auth->a_mutual_secret != NULL) {
 207                 len = strlen(auth->a_mutual_secret);
 208                 if (len > 16) {
 209                         if (auth->a_auth_group->ag_name != NULL)
 210                                 log_warnx("mutual secret for user \"%s\", "
 211                                     "auth-group \"%s\", is too long; it should "
 212                                     "be at most 16 characters long",
 213                                     auth->a_user, auth->a_auth_group->ag_name);
 214                         else
 215                                 log_warnx("mutual secret for user \"%s\", "
 216                                     "target \"%s\", is too long; it should "
 217                                     "be at most 16 characters long",
 218                                     auth->a_user,
 219                                     auth->a_auth_group->ag_target->t_name);
 220                 }
 221                 if (len < 12) {
 222                         if (auth->a_auth_group->ag_name != NULL)
 223                                 log_warnx("mutual secret for user \"%s\", "
 224                                     "auth-group \"%s\", is too short; it "
 225                                     "should be at least 12 characters long",
 226                                     auth->a_user, auth->a_auth_group->ag_name);
 227                         else
 228                                 log_warnx("mutual secret for user \"%s\", "
 229                                     "target \"%s\", is too short; it should be "
 230                                     "at least 12 characters long",
 231                                     auth->a_user,
 232                                     auth->a_auth_group->ag_target->t_name);
 233                 }
 234         }
 235 }
 236
 237 const struct auth *
 238 auth_new_chap(struct auth_group *ag, const char *user,
 239     const char *secret)
 240 {
 241         struct auth *auth;
 242
 243         if (ag->ag_type == AG_TYPE_UNKNOWN)
 244                 ag->ag_type = AG_TYPE_CHAP;
 245         if (ag->ag_type != AG_TYPE_CHAP) {
 246                 if (ag->ag_name != NULL)
 247                         log_warnx("cannot mix \"chap\" authentication with "
 248                             "other types for auth-group \"%s\"", ag->ag_name);
 249                 else
 250                         log_warnx("cannot mix \"chap\" authentication with "
 251                             "other types for target \"%s\"",
 252                             ag->ag_target->t_name);
 253                 return (NULL);
 254         }
 255
 256         auth = auth_new(ag);
 257         auth->a_user = checked_strdup(user);
 258         auth->a_secret = checked_strdup(secret);
 259
 260         auth_check_secret_length(auth);
 261
 262         return (auth);
 263 }
 264
 265 const struct auth *
 266 auth_new_chap_mutual(struct auth_group *ag, const char *user,
 267     const char *secret, const char *user2, const char *secret2)
 268 {
 269         struct auth *auth;
 270
 271         if (ag->ag_type == AG_TYPE_UNKNOWN)
 272                 ag->ag_type = AG_TYPE_CHAP_MUTUAL;
 273         if (ag->ag_type != AG_TYPE_CHAP_MUTUAL) {
 274                 if (ag->ag_name != NULL)
 275                         log_warnx("cannot mix \"chap-mutual\" authentication "
 276                             "with other types for auth-group \"%s\"",
 277                             ag->ag_name);
 278                 else
 279                         log_warnx("cannot mix \"chap-mutual\" authentication "
 280                             "with other types for target \"%s\"",
 281                             ag->ag_target->t_name);
 282                 return (NULL);
 283         }
 284
 285         auth = auth_new(ag);
 286         auth->a_user = checked_strdup(user);
 287         auth->a_secret = checked_strdup(secret);
 288         auth->a_mutual_user = checked_strdup(user2);
 289         auth->a_mutual_secret = checked_strdup(secret2);
 290
 291         auth_check_secret_length(auth);
 292
 293         return (auth);
 294 }
 295
 296 const struct auth_name *
 297 auth_name_new(struct auth_group *ag, const char *name)
 298 {
 299         struct auth_name *an;
 300
 301         an = calloc(1, sizeof(*an));
 302         if (an == NULL)
 303                 log_err(1, "calloc");
 304         an->an_auth_group = ag;
 305         an->an_initator_name = checked_strdup(name);
 306         TAILQ_INSERT_TAIL(&ag->ag_names, an, an_next);
 307         return (an);
 308 }
 309
 310 static void
 311 auth_name_delete(struct auth_name *an)
 312 {
 313         TAILQ_REMOVE(&an->an_auth_group->ag_names, an, an_next);
 314
 315         free(an->an_initator_name);
 316         free(an);
 317 }
 318
 319 bool
 320 auth_name_defined(const struct auth_group *ag)
 321 {
 322         if (TAILQ_EMPTY(&ag->ag_names))
 323                 return (false);
 324         return (true);
 325 }
 326
 327 const struct auth_name *
 328 auth_name_find(const struct auth_group *ag, const char *name)
 329 {
 330         const struct auth_name *auth_name;
 331
 332         TAILQ_FOREACH(auth_name, &ag->ag_names, an_next) {
 333                 if (strcmp(auth_name->an_initator_name, name) == 0)
 334                         return (auth_name);
 335         }
 336
 337         return (NULL);
 338 }
 339
 340 int
 341 auth_name_check(const struct auth_group *ag, const char *initiator_name)
 342 {
 343         if (!auth_name_defined(ag))
 344                 return (0);
 345
 346         if (auth_name_find(ag, initiator_name) == NULL)
 347                 return (1);
 348
 349         return (0);
 350 }
 351
 352 const struct auth_portal *
 353 auth_portal_new(struct auth_group *ag, const char *portal)
 354 {
 355         struct auth_portal *ap;
 356         char *net, *mask, *str, *tmp;
 357         int len, dm, m;
 358
 359         ap = calloc(1, sizeof(*ap));
 360         if (ap == NULL)
 361                 log_err(1, "calloc");
 362         ap->ap_auth_group = ag;
 363         ap->ap_initator_portal = checked_strdup(portal);
 364         mask = str = checked_strdup(portal);
 365         net = strsep(&mask, "/");
 366         if (net[0] == '[')
 367                 net++;
 368         len = strlen(net);
 369         if (len == 0)
 370                 goto error;
 371         if (net[len - 1] == ']')
 372                 net[len - 1] = 0;
 373         if (strchr(net, ':') != NULL) {
 374                 struct sockaddr_in6 *sin6 =
 375                     (struct sockaddr_in6 *)&ap->ap_sa;
 376
 377                 sin6->sin6_len = sizeof(*sin6);
 378                 sin6->sin6_family = AF_INET6;
 379                 if (inet_pton(AF_INET6, net, &sin6->sin6_addr) <= 0)
 380                         goto error;
 381                 dm = 128;
 382         } else {
 383                 struct sockaddr_in *sin =
 384                     (struct sockaddr_in *)&ap->ap_sa;
 385
 386                 sin->sin_len = sizeof(*sin);
 387                 sin->sin_family = AF_INET;
 388                 if (inet_pton(AF_INET, net, &sin->sin_addr) <= 0)
 389                         goto error;
 390                 dm = 32;
 391         }
 392         if (mask != NULL) {
 393                 m = strtol(mask, &tmp, 0);
 394                 if (m < 0 || m > dm || tmp[0] != 0)
 395                         goto error;
 396         } else
 397                 m = dm;
 398         ap->ap_mask = m;
 399         free(str);
 400         TAILQ_INSERT_TAIL(&ag->ag_portals, ap, ap_next);
 401         return (ap);
 402
 403 error:
 404         free(str);
 405         free(ap);
 406         log_warnx("incorrect initiator portal \"%s\"", portal);
 407         return (NULL);
 408 }
 409
 410 static void
 411 auth_portal_delete(struct auth_portal *ap)
 412 {
 413         TAILQ_REMOVE(&ap->ap_auth_group->ag_portals, ap, ap_next);
 414
 415         free(ap->ap_initator_portal);
 416         free(ap);
 417 }
 418
 419 bool
 420 auth_portal_defined(const struct auth_group *ag)
 421 {
 422         if (TAILQ_EMPTY(&ag->ag_portals))
 423                 return (false);
 424         return (true);
 425 }
 426
 427 const struct auth_portal *
 428 auth_portal_find(const struct auth_group *ag, const struct sockaddr_storage *ss)
 429 {
 430         const struct auth_portal *ap;
 431         const uint8_t *a, *b;
 432         int i;
 433         uint8_t bmask;
 434
 435         TAILQ_FOREACH(ap, &ag->ag_portals, ap_next) {
 436                 if (ap->ap_sa.ss_family != ss->ss_family)
 437                         continue;
 438                 if (ss->ss_family == AF_INET) {
 439                         a = (const uint8_t *)
 440                             &((const struct sockaddr_in *)ss)->sin_addr;
 441                         b = (const uint8_t *)
 442                             &((const struct sockaddr_in *)&ap->ap_sa)->sin_addr;
 443                 } else {
 444                         a = (const uint8_t *)
 445                             &((const struct sockaddr_in6 *)ss)->sin6_addr;
 446                         b = (const uint8_t *)
 447                             &((const struct sockaddr_in6 *)&ap->ap_sa)->sin6_addr;
 448                 }
 449                 for (i = 0; i < ap->ap_mask / 8; i++) {
 450                         if (a[i] != b[i])
 451                                 goto next;
 452                 }
 453                 if (ap->ap_mask % 8) {
 454                         bmask = 0xff << (8 - (ap->ap_mask % 8));
 455                         if ((a[i] & bmask) != (b[i] & bmask))
 456                                 goto next;
 457                 }
 458                 return (ap);
 459 next:
 460                 ;
 461         }
 462
 463         return (NULL);
 464 }
 465
 466 int
 467 auth_portal_check(const struct auth_group *ag, const struct sockaddr_storage *sa)
 468 {
 469
 470         if (!auth_portal_defined(ag))
 471                 return (0);
 472
 473         if (auth_portal_find(ag, sa) == NULL)
 474                 return (1);
 475
 476         return (0);
 477 }
 478
 479 struct auth_group *
 480 auth_group_new(struct conf *conf, const char *name)
 481 {
 482         struct auth_group *ag;
 483
 484         if (name != NULL) {
 485                 ag = auth_group_find(conf, name);
 486                 if (ag != NULL) {
 487                         log_warnx("duplicated auth-group \"%s\"", name);
 488                         return (NULL);
 489                 }
 490         }
 491
 492         ag = calloc(1, sizeof(*ag));
 493         if (ag == NULL)
 494                 log_err(1, "calloc");
 495         if (name != NULL)
 496                 ag->ag_name = checked_strdup(name);
 497         TAILQ_INIT(&ag->ag_auths);
 498         TAILQ_INIT(&ag->ag_names);
 499         TAILQ_INIT(&ag->ag_portals);
 500         ag->ag_conf = conf;
 501         TAILQ_INSERT_TAIL(&conf->conf_auth_groups, ag, ag_next);
 502
 503         return (ag);
 504 }
 505
 506 void
 507 auth_group_delete(struct auth_group *ag)
 508 {
 509         struct auth *auth, *auth_tmp;
 510         struct auth_name *auth_name, *auth_name_tmp;
 511         struct auth_portal *auth_portal, *auth_portal_tmp;
 512
 513         TAILQ_REMOVE(&ag->ag_conf->conf_auth_groups, ag, ag_next);
 514
 515         TAILQ_FOREACH_SAFE(auth, &ag->ag_auths, a_next, auth_tmp)
 516                 auth_delete(auth);
 517         TAILQ_FOREACH_SAFE(auth_name, &ag->ag_names, an_next, auth_name_tmp)
 518                 auth_name_delete(auth_name);
 519         TAILQ_FOREACH_SAFE(auth_portal, &ag->ag_portals, ap_next,
 520             auth_portal_tmp)
 521                 auth_portal_delete(auth_portal);
 522         free(ag->ag_name);
 523         free(ag);
 524 }
 525
 526 struct auth_group *
 527 auth_group_find(const struct conf *conf, const char *name)
 528 {
 529         struct auth_group *ag;
 530
 531         TAILQ_FOREACH(ag, &conf->conf_auth_groups, ag_next) {
 532                 if (ag->ag_name != NULL && strcmp(ag->ag_name, name) == 0)
 533                         return (ag);
 534         }
 535
 536         return (NULL);
 537 }
 538
 539 int
 540 auth_group_set_type(struct auth_group *ag, const char *str)
 541 {
 542         int type;
 543
 544         if (strcmp(str, "none") == 0) {
 545                 type = AG_TYPE_NO_AUTHENTICATION;
 546         } else if (strcmp(str, "deny") == 0) {
 547                 type = AG_TYPE_DENY;
 548         } else if (strcmp(str, "chap") == 0) {
 549                 type = AG_TYPE_CHAP;
 550         } else if (strcmp(str, "chap-mutual") == 0) {
 551                 type = AG_TYPE_CHAP_MUTUAL;
 552         } else {
 553                 if (ag->ag_name != NULL)
 554                         log_warnx("invalid auth-type \"%s\" for auth-group "
 555                             "\"%s\"", str, ag->ag_name);
 556                 else
 557                         log_warnx("invalid auth-type \"%s\" for target "
 558                             "\"%s\"", str, ag->ag_target->t_name);
 559                 return (1);
 560         }
 561
 562         if (ag->ag_type != AG_TYPE_UNKNOWN && ag->ag_type != type) {
 563                 if (ag->ag_name != NULL) {
 564                         log_warnx("cannot set auth-type to \"%s\" for "
 565                             "auth-group \"%s\"; already has a different "
 566                             "type", str, ag->ag_name);
 567                 } else {
 568                         log_warnx("cannot set auth-type to \"%s\" for target "
 569                             "\"%s\"; already has a different type",
 570                             str, ag->ag_target->t_name);
 571                 }
 572                 return (1);
 573         }
 574
 575         ag->ag_type = type;
 576
 577         return (0);
 578 }
 579
 580 static struct portal *
 581 portal_new(struct portal_group *pg)
 582 {
 583         struct portal *portal;
 584
 585         portal = calloc(1, sizeof(*portal));
 586         if (portal == NULL)
 587                 log_err(1, "calloc");
 588         TAILQ_INIT(&portal->p_targets);
 589         portal->p_portal_group = pg;
 590         TAILQ_INSERT_TAIL(&pg->pg_portals, portal, p_next);
 591         return (portal);
 592 }
 593
 594 static void
 595 portal_delete(struct portal *portal)
 596 {
 597
 598         TAILQ_REMOVE(&portal->p_portal_group->pg_portals, portal, p_next);
 599         if (portal->p_ai != NULL)
 600                 freeaddrinfo(portal->p_ai);
 601         free(portal->p_listen);
 602         free(portal);
 603 }
 604
 605 struct portal_group *
 606 portal_group_new(struct conf *conf, const char *name)
 607 {
 608         struct portal_group *pg;
 609
 610         pg = portal_group_find(conf, name);
 611         if (pg != NULL) {
 612                 log_warnx("duplicated portal-group \"%s\"", name);
 613                 return (NULL);
 614         }
 615
 616         pg = calloc(1, sizeof(*pg));
 617         if (pg == NULL)
 618                 log_err(1, "calloc");
 619         pg->pg_name = checked_strdup(name);
 620         TAILQ_INIT(&pg->pg_options);
 621         TAILQ_INIT(&pg->pg_portals);
 622         TAILQ_INIT(&pg->pg_ports);
 623         pg->pg_conf = conf;
 624         pg->pg_tag = 0;         /* Assigned later in conf_apply(). */
 625         TAILQ_INSERT_TAIL(&conf->conf_portal_groups, pg, pg_next);
 626
 627         return (pg);
 628 }
 629
 630 void
 631 portal_group_delete(struct portal_group *pg)
 632 {
 633         struct portal *portal, *tmp;
 634         struct port *port, *tport;
 635         struct option *o, *otmp;
 636
 637         TAILQ_FOREACH_SAFE(port, &pg->pg_ports, p_pgs, tport)
 638                 port_delete(port);
 639         TAILQ_REMOVE(&pg->pg_conf->conf_portal_groups, pg, pg_next);
 640
 641         TAILQ_FOREACH_SAFE(portal, &pg->pg_portals, p_next, tmp)
 642                 portal_delete(portal);
 643         TAILQ_FOREACH_SAFE(o, &pg->pg_options, o_next, otmp)
 644                 option_delete(&pg->pg_options, o);
 645         free(pg->pg_name);
 646         free(pg->pg_offload);
 647         free(pg->pg_redirection);
 648         free(pg);
 649 }
 650
 651 struct portal_group *
 652 portal_group_find(const struct conf *conf, const char *name)
 653 {
 654         struct portal_group *pg;
 655
 656         TAILQ_FOREACH(pg, &conf->conf_portal_groups, pg_next) {
 657                 if (strcmp(pg->pg_name, name) == 0)
 658                         return (pg);
 659         }
 660
 661         return (NULL);
 662 }
 663
 664 static int
 665 parse_addr_port(char *arg, const char *def_port, struct addrinfo **ai)
 666 {
 667         struct addrinfo hints;
 668         char *str, *addr, *ch;
 669         const char *port;
 670         int error, colons = 0;
 671
 672         str = arg = strdup(arg);
 673         if (arg[0] == '[') {
 674                 /*
 675                  * IPv6 address in square brackets, perhaps with port.
 676                  */
 677                 arg++;
 678                 addr = strsep(&arg, "]");
 679                 if (arg == NULL) {
 680                         free(str);
 681                         return (1);
 682                 }
 683                 if (arg[0] == '\0') {
 684                         port = def_port;
 685                 } else if (arg[0] == ':') {
 686                         port = arg + 1;
 687                 } else {
 688                         free(str);
 689                         return (1);
 690                 }
 691         } else {
 692                 /*
 693                  * Either IPv6 address without brackets - and without
 694                  * a port - or IPv4 address.  Just count the colons.
 695                  */
 696                 for (ch = arg; *ch != '\0'; ch++) {
 697                         if (*ch == ':')
 698                                 colons++;
 699                 }
 700                 if (colons > 1) {
 701                         addr = arg;
 702                         port = def_port;
 703                 } else {
 704                         addr = strsep(&arg, ":");
 705                         if (arg == NULL)
 706                                 port = def_port;
 707                         else
 708                                 port = arg;
 709                 }
 710         }
 711
 712         memset(&hints, 0, sizeof(hints));
 713         hints.ai_family = PF_UNSPEC;
 714         hints.ai_socktype = SOCK_STREAM;
 715         hints.ai_flags = AI_PASSIVE;
 716         error = getaddrinfo(addr, port, &hints, ai);
 717         free(str);
 718         return ((error != 0) ? 1 : 0);
 719 }
 720
 721 int
 722 portal_group_add_listen(struct portal_group *pg, const char *value, bool iser)
 723 {
 724         struct portal *portal;
 725
 726         portal = portal_new(pg);
 727         portal->p_listen = checked_strdup(value);
 728         portal->p_iser = iser;
 729
 730         if (parse_addr_port(portal->p_listen, "3260", &portal->p_ai)) {
 731                 log_warnx("invalid listen address %s", portal->p_listen);
 732                 portal_delete(portal);
 733                 return (1);
 734         }
 735
 736         /*
 737          * XXX: getaddrinfo(3) may return multiple addresses; we should turn
 738          *      those into multiple portals.
 739          */
 740
 741         return (0);
 742 }
 743
 744 int
 745 isns_new(struct conf *conf, const char *addr)
 746 {
 747         struct isns *isns;
 748
 749         isns = calloc(1, sizeof(*isns));
 750         if (isns == NULL)
 751                 log_err(1, "calloc");
 752         isns->i_conf = conf;
 753         TAILQ_INSERT_TAIL(&conf->conf_isns, isns, i_next);
 754         isns->i_addr = checked_strdup(addr);
 755
 756         if (parse_addr_port(isns->i_addr, "3205", &isns->i_ai)) {
 757                 log_warnx("invalid iSNS address %s", isns->i_addr);
 758                 isns_delete(isns);
 759                 return (1);
 760         }
 761
 762         /*
 763          * XXX: getaddrinfo(3) may return multiple addresses; we should turn
 764          *      those into multiple servers.
 765          */
 766
 767         return (0);
 768 }
 769
 770 void
 771 isns_delete(struct isns *isns)
 772 {
 773
 774         TAILQ_REMOVE(&isns->i_conf->conf_isns, isns, i_next);
 775         free(isns->i_addr);
 776         if (isns->i_ai != NULL)
 777                 freeaddrinfo(isns->i_ai);
 778         free(isns);
 779 }
 780
 781 static int
 782 isns_do_connect(struct isns *isns)
 783 {
 784         int s;
 785
 786         s = socket(isns->i_ai->ai_family, isns->i_ai->ai_socktype,
 787             isns->i_ai->ai_protocol);
 788         if (s < 0) {
 789                 log_warn("socket(2) failed for %s", isns->i_addr);
 790                 return (-1);
 791         }
 792         if (connect(s, isns->i_ai->ai_addr, isns->i_ai->ai_addrlen)) {
 793                 log_warn("connect(2) failed for %s", isns->i_addr);
 794                 close(s);
 795                 return (-1);
 796         }
 797         return(s);
 798 }
 799
 800 static int
 801 isns_do_register(struct isns *isns, int s, const char *hostname)
 802 {
 803         struct conf *conf = isns->i_conf;
 804         struct target *target;
 805         struct portal *portal;
 806         struct portal_group *pg;
 807         struct port *port;
 808         struct isns_req *req;
 809         int res = 0;
 810         uint32_t error;
 811
 812         req = isns_req_create(ISNS_FUNC_DEVATTRREG, ISNS_FLAG_CLIENT);
 813         isns_req_add_str(req, 32, TAILQ_FIRST(&conf->conf_targets)->t_name);
 814         isns_req_add_delim(req);
 815         isns_req_add_str(req, 1, hostname);
 816         isns_req_add_32(req, 2, 2); /* 2 -- iSCSI */
 817         isns_req_add_32(req, 6, conf->conf_isns_period);
 818         TAILQ_FOREACH(pg, &conf->conf_portal_groups, pg_next) {
 819                 if (pg->pg_unassigned)
 820                         continue;
 821                 TAILQ_FOREACH(portal, &pg->pg_portals, p_next) {
 822                         isns_req_add_addr(req, 16, portal->p_ai);
 823                         isns_req_add_port(req, 17, portal->p_ai);
 824                 }
 825         }
 826         TAILQ_FOREACH(target, &conf->conf_targets, t_next) {
 827                 isns_req_add_str(req, 32, target->t_name);
 828                 isns_req_add_32(req, 33, 1); /* 1 -- Target*/
 829                 if (target->t_alias != NULL)
 830                         isns_req_add_str(req, 34, target->t_alias);
 831                 TAILQ_FOREACH(port, &target->t_ports, p_ts) {
 832                         if ((pg = port->p_portal_group) == NULL)
 833                                 continue;
 834                         isns_req_add_32(req, 51, pg->pg_tag);
 835                         TAILQ_FOREACH(portal, &pg->pg_portals, p_next) {
 836                                 isns_req_add_addr(req, 49, portal->p_ai);
 837                                 isns_req_add_port(req, 50, portal->p_ai);
 838                         }
 839                 }
 840         }
 841         res = isns_req_send(s, req);
 842         if (res < 0) {
 843                 log_warn("send(2) failed for %s", isns->i_addr);
 844                 goto quit;
 845         }
 846         res = isns_req_receive(s, req);
 847         if (res < 0) {
 848                 log_warn("receive(2) failed for %s", isns->i_addr);
 849                 goto quit;
 850         }
 851         error = isns_req_get_status(req);
 852         if (error != 0) {
 853                 log_warnx("iSNS register error %d for %s", error, isns->i_addr);
 854                 res = -1;
 855         }
 856 quit:
 857         isns_req_free(req);
 858         return (res);
 859 }
 860
 861 static int
 862 isns_do_check(struct isns *isns, int s, const char *hostname)
 863 {
 864         struct conf *conf = isns->i_conf;
 865         struct isns_req *req;
 866         int res = 0;
 867         uint32_t error;
 868
 869         req = isns_req_create(ISNS_FUNC_DEVATTRQRY, ISNS_FLAG_CLIENT);
 870         isns_req_add_str(req, 32, TAILQ_FIRST(&conf->conf_targets)->t_name);
 871         isns_req_add_str(req, 1, hostname);
 872         isns_req_add_delim(req);
 873         isns_req_add(req, 2, 0, NULL);
 874         res = isns_req_send(s, req);
 875         if (res < 0) {
 876                 log_warn("send(2) failed for %s", isns->i_addr);
 877                 goto quit;
 878         }
 879         res = isns_req_receive(s, req);
 880         if (res < 0) {
 881                 log_warn("receive(2) failed for %s", isns->i_addr);
 882                 goto quit;
 883         }
 884         error = isns_req_get_status(req);
 885         if (error != 0) {
 886                 log_warnx("iSNS check error %d for %s", error, isns->i_addr);
 887                 res = -1;
 888         }
 889 quit:
 890         isns_req_free(req);
 891         return (res);
 892 }
 893
 894 static int
 895 isns_do_deregister(struct isns *isns, int s, const char *hostname)
 896 {
 897         struct conf *conf = isns->i_conf;
 898         struct isns_req *req;
 899         int res = 0;
 900         uint32_t error;
 901
 902         req = isns_req_create(ISNS_FUNC_DEVDEREG, ISNS_FLAG_CLIENT);
 903         isns_req_add_str(req, 32, TAILQ_FIRST(&conf->conf_targets)->t_name);
 904         isns_req_add_delim(req);
 905         isns_req_add_str(req, 1, hostname);
 906         res = isns_req_send(s, req);
 907         if (res < 0) {
 908                 log_warn("send(2) failed for %s", isns->i_addr);
 909                 goto quit;
 910         }
 911         res = isns_req_receive(s, req);
 912         if (res < 0) {
 913                 log_warn("receive(2) failed for %s", isns->i_addr);
 914                 goto quit;
 915         }
 916         error = isns_req_get_status(req);
 917         if (error != 0) {
 918                 log_warnx("iSNS deregister error %d for %s", error, isns->i_addr);
 919                 res = -1;
 920         }
 921 quit:
 922         isns_req_free(req);
 923         return (res);
 924 }
 925
 926 void
 927 isns_register(struct isns *isns, struct isns *oldisns)
 928 {
 929         struct conf *conf = isns->i_conf;
 930         int s;
 931         char hostname[256];
 932
 933         if (TAILQ_EMPTY(&conf->conf_targets) ||
 934             TAILQ_EMPTY(&conf->conf_portal_groups))
 935                 return;
 936         set_timeout(conf->conf_isns_timeout, false);
 937         s = isns_do_connect(isns);
 938         if (s < 0) {
 939                 set_timeout(0, false);
 940                 return;
 941         }
 942         gethostname(hostname, sizeof(hostname));
 943
 944         if (oldisns == NULL || TAILQ_EMPTY(&oldisns->i_conf->conf_targets))
 945                 oldisns = isns;
 946         isns_do_deregister(oldisns, s, hostname);
 947         isns_do_register(isns, s, hostname);
 948         close(s);
 949         set_timeout(0, false);
 950 }
 951
 952 void
 953 isns_check(struct isns *isns)
 954 {
 955         struct conf *conf = isns->i_conf;
 956         int s, res;
 957         char hostname[256];
 958
 959         if (TAILQ_EMPTY(&conf->conf_targets) ||
 960             TAILQ_EMPTY(&conf->conf_portal_groups))
 961                 return;
 962         set_timeout(conf->conf_isns_timeout, false);
 963         s = isns_do_connect(isns);
 964         if (s < 0) {
 965                 set_timeout(0, false);
 966                 return;
 967         }
 968         gethostname(hostname, sizeof(hostname));
 969
 970         res = isns_do_check(isns, s, hostname);
 971         if (res < 0) {
 972                 isns_do_deregister(isns, s, hostname);
 973                 isns_do_register(isns, s, hostname);
 974         }
 975         close(s);
 976         set_timeout(0, false);
 977 }
 978
 979 void
 980 isns_deregister(struct isns *isns)
 981 {
 982         struct conf *conf = isns->i_conf;
 983         int s;
 984         char hostname[256];
 985
 986         if (TAILQ_EMPTY(&conf->conf_targets) ||
 987             TAILQ_EMPTY(&conf->conf_portal_groups))
 988                 return;
 989         set_timeout(conf->conf_isns_timeout, false);
 990         s = isns_do_connect(isns);
 991         if (s < 0)
 992                 return;
 993         gethostname(hostname, sizeof(hostname));
 994
 995         isns_do_deregister(isns, s, hostname);
 996         close(s);
 997         set_timeout(0, false);
 998 }
 999
1000 int
1001 portal_group_set_filter(struct portal_group *pg, const char *str)
1002 {
1003         int filter;
1004
1005         if (strcmp(str, "none") == 0) {
1006                 filter = PG_FILTER_NONE;
1007         } else if (strcmp(str, "portal") == 0) {
1008                 filter = PG_FILTER_PORTAL;
1009         } else if (strcmp(str, "portal-name") == 0) {
1010                 filter = PG_FILTER_PORTAL_NAME;
1011         } else if (strcmp(str, "portal-name-auth") == 0) {
1012                 filter = PG_FILTER_PORTAL_NAME_AUTH;
1013         } else {
1014                 log_warnx("invalid discovery-filter \"%s\" for portal-group "
1015                     "\"%s\"; valid values are \"none\", \"portal\", "
1016                     "\"portal-name\", and \"portal-name-auth\"",
1017                     str, pg->pg_name);
1018                 return (1);
1019         }
1020
1021         if (pg->pg_discovery_filter != PG_FILTER_UNKNOWN &&
1022             pg->pg_discovery_filter != filter) {
1023                 log_warnx("cannot set discovery-filter to \"%s\" for "
1024                     "portal-group \"%s\"; already has a different "
1025                     "value", str, pg->pg_name);
1026                 return (1);
1027         }
1028
1029         pg->pg_discovery_filter = filter;
1030
1031         return (0);
1032 }
1033
1034 int
1035 portal_group_set_offload(struct portal_group *pg, const char *offload)
1036 {
1037
1038         if (pg->pg_offload != NULL) {
1039                 log_warnx("cannot set offload to \"%s\" for "
1040                     "portal-group \"%s\"; already defined",
1041                     offload, pg->pg_name);
1042                 return (1);
1043         }
1044
1045         pg->pg_offload = checked_strdup(offload);
1046
1047         return (0);
1048 }
1049
1050 int
1051 portal_group_set_redirection(struct portal_group *pg, const char *addr)
1052 {
1053
1054         if (pg->pg_redirection != NULL) {
1055                 log_warnx("cannot set redirection to \"%s\" for "
1056                     "portal-group \"%s\"; already defined",
1057                     addr, pg->pg_name);
1058                 return (1);
1059         }
1060
1061         pg->pg_redirection = checked_strdup(addr);
1062
1063         return (0);
1064 }
1065
1066 static bool
1067 valid_hex(const char ch)
1068 {
1069         switch (ch) {
1070         case '0':
1071         case '1':
1072         case '2':
1073         case '3':
1074         case '4':
1075         case '5':
1076         case '6':
1077         case '7':
1078         case '8':
1079         case '9':
1080         case 'a':
1081         case 'A':
1082         case 'b':
1083         case 'B':
1084         case 'c':
1085         case 'C':
1086         case 'd':
1087         case 'D':
1088         case 'e':
1089         case 'E':
1090         case 'f':
1091         case 'F':
1092                 return (true);
1093         default:
1094                 return (false);
1095         }
1096 }
1097
1098 bool
1099 valid_iscsi_name(const char *name)
1100 {
1101         int i;
1102
1103         if (strlen(name) >= MAX_NAME_LEN) {
1104                 log_warnx("overlong name for target \"%s\"; max length allowed "
1105                     "by iSCSI specification is %d characters",
1106                     name, MAX_NAME_LEN);
1107                 return (false);
1108         }
1109
1110         /*
1111          * In the cases below, we don't return an error, just in case the admin
1112          * was right, and we're wrong.
1113          */
1114         if (strncasecmp(name, "iqn.", strlen("iqn.")) == 0) {
1115                 for (i = strlen("iqn."); name[i] != '\0'; i++) {
1116                         /*
1117                          * XXX: We should verify UTF-8 normalisation, as defined
1118                          *      by 3.2.6.2: iSCSI Name Encoding.
1119                          */
1120                         if (isalnum(name[i]))
1121                                 continue;
1122                         if (name[i] == '-' || name[i] == '.' || name[i] == ':')
1123                                 continue;
1124                         log_warnx("invalid character \"%c\" in target name "
1125                             "\"%s\"; allowed characters are letters, digits, "
1126                             "'-', '.', and ':'", name[i], name);
1127                         break;
1128                 }
1129                 /*
1130                  * XXX: Check more stuff: valid date and a valid reversed domain.
1131                  */
1132         } else if (strncasecmp(name, "eui.", strlen("eui.")) == 0) {
1133                 if (strlen(name) != strlen("eui.") + 16)
1134                         log_warnx("invalid target name \"%s\"; the \"eui.\" "
1135                             "should be followed by exactly 16 hexadecimal "
1136                             "digits", name);
1137                 for (i = strlen("eui."); name[i] != '\0'; i++) {
1138                         if (!valid_hex(name[i])) {
1139                                 log_warnx("invalid character \"%c\" in target "
1140                                     "name \"%s\"; allowed characters are 1-9 "
1141                                     "and A-F", name[i], name);
1142                                 break;
1143                         }
1144                 }
1145         } else if (strncasecmp(name, "naa.", strlen("naa.")) == 0) {
1146                 if (strlen(name) > strlen("naa.") + 32)
1147                         log_warnx("invalid target name \"%s\"; the \"naa.\" "
1148                             "should be followed by at most 32 hexadecimal "
1149                             "digits", name);
1150                 for (i = strlen("naa."); name[i] != '\0'; i++) {
1151                         if (!valid_hex(name[i])) {
1152                                 log_warnx("invalid character \"%c\" in target "
1153                                     "name \"%s\"; allowed characters are 1-9 "
1154                                     "and A-F", name[i], name);
1155                                 break;
1156                         }
1157                 }
1158         } else {
1159                 log_warnx("invalid target name \"%s\"; should start with "
1160                     "either \"iqn.\", \"eui.\", or \"naa.\"",
1161                     name);
1162         }
1163         return (true);
1164 }
1165
1166 struct pport *
1167 pport_new(struct conf *conf, const char *name, uint32_t ctl_port)
1168 {
1169         struct pport *pp;
1170
1171         pp = calloc(1, sizeof(*pp));
1172         if (pp == NULL)
1173                 log_err(1, "calloc");
1174         pp->pp_conf = conf;
1175         pp->pp_name = checked_strdup(name);
1176         pp->pp_ctl_port = ctl_port;
1177         TAILQ_INIT(&pp->pp_ports);
1178         TAILQ_INSERT_TAIL(&conf->conf_pports, pp, pp_next);
1179         return (pp);
1180 }
1181
1182 struct pport *
1183 pport_find(const struct conf *conf, const char *name)
1184 {
1185         struct pport *pp;
1186
1187         TAILQ_FOREACH(pp, &conf->conf_pports, pp_next) {
1188                 if (strcasecmp(pp->pp_name, name) == 0)
1189                         return (pp);
1190         }
1191         return (NULL);
1192 }
1193
1194 struct pport *
1195 pport_copy(struct pport *pp, struct conf *conf)
1196 {
1197         struct pport *ppnew;
1198
1199         ppnew = pport_new(conf, pp->pp_name, pp->pp_ctl_port);
1200         return (ppnew);
1201 }
1202
1203 void
1204 pport_delete(struct pport *pp)
1205 {
1206         struct port *port, *tport;
1207
1208         TAILQ_FOREACH_SAFE(port, &pp->pp_ports, p_ts, tport)
1209                 port_delete(port);
1210         TAILQ_REMOVE(&pp->pp_conf->conf_pports, pp, pp_next);
1211         free(pp->pp_name);
1212         free(pp);
1213 }
1214
1215 struct port *
1216 port_new(struct conf *conf, struct target *target, struct portal_group *pg)
1217 {
1218         struct port *port;
1219         char *name;
1220         int ret;
1221
1222         ret = asprintf(&name, "%s-%s", pg->pg_name, target->t_name);
1223         if (ret <= 0)
1224                 log_err(1, "asprintf");
1225         if (port_find(conf, name) != NULL) {
1226                 log_warnx("duplicate port \"%s\"", name);
1227                 free(name);
1228                 return (NULL);
1229         }
1230         port = calloc(1, sizeof(*port));
1231         if (port == NULL)
1232                 log_err(1, "calloc");
1233         port->p_conf = conf;
1234         port->p_name = name;
1235         TAILQ_INSERT_TAIL(&conf->conf_ports, port, p_next);
1236         TAILQ_INSERT_TAIL(&target->t_ports, port, p_ts);
1237         port->p_target = target;
1238         TAILQ_INSERT_TAIL(&pg->pg_ports, port, p_pgs);
1239         port->p_portal_group = pg;
1240         port->p_foreign = pg->pg_foreign;
1241         return (port);
1242 }
1243
1244 struct port *
1245 port_new_pp(struct conf *conf, struct target *target, struct pport *pp)
1246 {
1247         struct port *port;
1248         char *name;
1249         int ret;
1250
1251         ret = asprintf(&name, "%s-%s", pp->pp_name, target->t_name);
1252         if (ret <= 0)
1253                 log_err(1, "asprintf");
1254         if (port_find(conf, name) != NULL) {
1255                 log_warnx("duplicate port \"%s\"", name);
1256                 free(name);
1257                 return (NULL);
1258         }
1259         port = calloc(1, sizeof(*port));
1260         if (port == NULL)
1261                 log_err(1, "calloc");
1262         port->p_conf = conf;
1263         port->p_name = name;
1264         TAILQ_INSERT_TAIL(&conf->conf_ports, port, p_next);
1265         TAILQ_INSERT_TAIL(&target->t_ports, port, p_ts);
1266         port->p_target = target;
1267         TAILQ_INSERT_TAIL(&pp->pp_ports, port, p_pps);
1268         port->p_pport = pp;
1269         return (port);
1270 }
1271
1272 struct port *
1273 port_find(const struct conf *conf, const char *name)
1274 {
1275         struct port *port;
1276
1277         TAILQ_FOREACH(port, &conf->conf_ports, p_next) {
1278                 if (strcasecmp(port->p_name, name) == 0)
1279                         return (port);
1280         }
1281
1282         return (NULL);
1283 }
1284
1285 struct port *
1286 port_find_in_pg(const struct portal_group *pg, const char *target)
1287 {
1288         struct port *port;
1289
1290         TAILQ_FOREACH(port, &pg->pg_ports, p_pgs) {
1291                 if (strcasecmp(port->p_target->t_name, target) == 0)
1292                         return (port);
1293         }
1294
1295         return (NULL);
1296 }
1297
1298 void
1299 port_delete(struct port *port)
1300 {
1301
1302         if (port->p_portal_group)
1303                 TAILQ_REMOVE(&port->p_portal_group->pg_ports, port, p_pgs);
1304         if (port->p_pport)
1305                 TAILQ_REMOVE(&port->p_pport->pp_ports, port, p_pps);
1306         if (port->p_target)
1307                 TAILQ_REMOVE(&port->p_target->t_ports, port, p_ts);
1308         TAILQ_REMOVE(&port->p_conf->conf_ports, port, p_next);
1309         free(port->p_name);
1310         free(port);
1311 }
1312
1313 struct target *
1314 target_new(struct conf *conf, const char *name)
1315 {
1316         struct target *targ;
1317         int i, len;
1318
1319         targ = target_find(conf, name);
1320         if (targ != NULL) {
1321                 log_warnx("duplicated target \"%s\"", name);
1322                 return (NULL);
1323         }
1324         if (valid_iscsi_name(name) == false) {
1325                 log_warnx("target name \"%s\" is invalid", name);
1326                 return (NULL);
1327         }
1328         targ = calloc(1, sizeof(*targ));
1329         if (targ == NULL)
1330                 log_err(1, "calloc");
1331         targ->t_name = checked_strdup(name);
1332
1333         /*
1334          * RFC 3722 requires us to normalize the name to lowercase.
1335          */
1336         len = strlen(name);
1337         for (i = 0; i < len; i++)
1338                 targ->t_name[i] = tolower(targ->t_name[i]);
1339
1340         targ->t_conf = conf;
1341         TAILQ_INIT(&targ->t_ports);
1342         TAILQ_INSERT_TAIL(&conf->conf_targets, targ, t_next);
1343
1344         return (targ);
1345 }
1346
1347 void
1348 target_delete(struct target *targ)
1349 {
1350         struct port *port, *tport;
1351
1352         TAILQ_FOREACH_SAFE(port, &targ->t_ports, p_ts, tport)
1353                 port_delete(port);
1354         TAILQ_REMOVE(&targ->t_conf->conf_targets, targ, t_next);
1355
1356         free(targ->t_name);
1357         free(targ->t_redirection);
1358         free(targ);
1359 }
1360
1361 struct target *
1362 target_find(struct conf *conf, const char *name)
1363 {
1364         struct target *targ;
1365
1366         TAILQ_FOREACH(targ, &conf->conf_targets, t_next) {
1367                 if (strcasecmp(targ->t_name, name) == 0)
1368                         return (targ);
1369         }
1370
1371         return (NULL);
1372 }
1373
1374 int
1375 target_set_redirection(struct target *target, const char *addr)
1376 {
1377
1378         if (target->t_redirection != NULL) {
1379                 log_warnx("cannot set redirection to \"%s\" for "
1380                     "target \"%s\"; already defined",
1381                     addr, target->t_name);
1382                 return (1);
1383         }
1384
1385         target->t_redirection = checked_strdup(addr);
1386
1387         return (0);
1388 }
1389
1390 struct lun *
1391 lun_new(struct conf *conf, const char *name)
1392 {
1393         struct lun *lun;
1394
1395         lun = lun_find(conf, name);
1396         if (lun != NULL) {
1397                 log_warnx("duplicated lun \"%s\"", name);
1398                 return (NULL);
1399         }
1400
1401         lun = calloc(1, sizeof(*lun));
1402         if (lun == NULL)
1403                 log_err(1, "calloc");
1404         lun->l_conf = conf;
1405         lun->l_name = checked_strdup(name);
1406         TAILQ_INIT(&lun->l_options);
1407         TAILQ_INSERT_TAIL(&conf->conf_luns, lun, l_next);
1408         lun->l_ctl_lun = -1;
1409
1410         return (lun);
1411 }
1412
1413 void
1414 lun_delete(struct lun *lun)
1415 {
1416         struct target *targ;
1417         struct option *o, *tmp;
1418         int i;
1419
1420         TAILQ_FOREACH(targ, &lun->l_conf->conf_targets, t_next) {
1421                 for (i = 0; i < MAX_LUNS; i++) {
1422                         if (targ->t_luns[i] == lun)
1423                                 targ->t_luns[i] = NULL;
1424                 }
1425         }
1426         TAILQ_REMOVE(&lun->l_conf->conf_luns, lun, l_next);
1427
1428         TAILQ_FOREACH_SAFE(o, &lun->l_options, o_next, tmp)
1429                 option_delete(&lun->l_options, o);
1430         free(lun->l_name);
1431         free(lun->l_backend);
1432         free(lun->l_device_id);
1433         free(lun->l_path);
1434         free(lun->l_scsiname);
1435         free(lun->l_serial);
1436         free(lun);
1437 }
1438
1439 struct lun *
1440 lun_find(const struct conf *conf, const char *name)
1441 {
1442         struct lun *lun;
1443
1444         TAILQ_FOREACH(lun, &conf->conf_luns, l_next) {
1445                 if (strcmp(lun->l_name, name) == 0)
1446                         return (lun);
1447         }
1448
1449         return (NULL);
1450 }
1451
1452 void
1453 lun_set_backend(struct lun *lun, const char *value)
1454 {
1455         free(lun->l_backend);
1456         lun->l_backend = checked_strdup(value);
1457 }
1458
1459 void
1460 lun_set_blocksize(struct lun *lun, size_t value)
1461 {
1462
1463         lun->l_blocksize = value;
1464 }
1465
1466 void
1467 lun_set_device_type(struct lun *lun, uint8_t value)
1468 {
1469
1470         lun->l_device_type = value;
1471 }
1472
1473 void
1474 lun_set_device_id(struct lun *lun, const char *value)
1475 {
1476         free(lun->l_device_id);
1477         lun->l_device_id = checked_strdup(value);
1478 }
1479
1480 void
1481 lun_set_path(struct lun *lun, const char *value)
1482 {
1483         free(lun->l_path);
1484         lun->l_path = checked_strdup(value);
1485 }
1486
1487 void
1488 lun_set_scsiname(struct lun *lun, const char *value)
1489 {
1490         free(lun->l_scsiname);
1491         lun->l_scsiname = checked_strdup(value);
1492 }
1493
1494 void
1495 lun_set_serial(struct lun *lun, const char *value)
1496 {
1497         free(lun->l_serial);
1498         lun->l_serial = checked_strdup(value);
1499 }
1500
1501 void
1502 lun_set_size(struct lun *lun, size_t value)
1503 {
1504
1505         lun->l_size = value;
1506 }
1507
1508 void
1509 lun_set_ctl_lun(struct lun *lun, uint32_t value)
1510 {
1511
1512         lun->l_ctl_lun = value;
1513 }
1514
1515 struct option *
1516 option_new(struct options *options, const char *name, const char *value)
1517 {
1518         struct option *o;
1519
1520         o = option_find(options, name);
1521         if (o != NULL) {
1522                 log_warnx("duplicated option \"%s\"", name);
1523                 return (NULL);
1524         }
1525
1526         o = calloc(1, sizeof(*o));
1527         if (o == NULL)
1528                 log_err(1, "calloc");
1529         o->o_name = checked_strdup(name);
1530         o->o_value = checked_strdup(value);
1531         TAILQ_INSERT_TAIL(options, o, o_next);
1532
1533         return (o);
1534 }
1535
1536 void
1537 option_delete(struct options *options, struct option *o)
1538 {
1539
1540         TAILQ_REMOVE(options, o, o_next);
1541         free(o->o_name);
1542         free(o->o_value);
1543         free(o);
1544 }
1545
1546 struct option *
1547 option_find(const struct options *options, const char *name)
1548 {
1549         struct option *o;
1550
1551         TAILQ_FOREACH(o, options, o_next) {
1552                 if (strcmp(o->o_name, name) == 0)
1553                         return (o);
1554         }
1555
1556         return (NULL);
1557 }
1558
1559 void
1560 option_set(struct option *o, const char *value)
1561 {
1562
1563         free(o->o_value);
1564         o->o_value = checked_strdup(value);
1565 }
1566
1567 static struct connection *
1568 connection_new(struct portal *portal, int fd, const char *host,
1569     const struct sockaddr *client_sa)
1570 {
1571         struct connection *conn;
1572
1573         conn = calloc(1, sizeof(*conn));
1574         if (conn == NULL)
1575                 log_err(1, "calloc");
1576         conn->conn_portal = portal;
1577         conn->conn_socket = fd;
1578         conn->conn_initiator_addr = checked_strdup(host);
1579         memcpy(&conn->conn_initiator_sa, client_sa, client_sa->sa_len);
1580
1581         /*
1582          * Default values, from RFC 3720, section 12.
1583          */
1584         conn->conn_max_recv_data_segment_length = 8192;
1585         conn->conn_max_burst_length = 262144;
1586         conn->conn_first_burst_length = 65536;
1587         conn->conn_immediate_data = true;
1588
1589         return (conn);
1590 }
1591
1592 #if 0
1593 static void
1594 conf_print(struct conf *conf)
1595 {
1596         struct auth_group *ag;
1597         struct auth *auth;
1598         struct auth_name *auth_name;
1599         struct auth_portal *auth_portal;
1600         struct portal_group *pg;
1601         struct portal *portal;
1602         struct target *targ;
1603         struct lun *lun;
1604         struct option *o;
1605
1606         TAILQ_FOREACH(ag, &conf->conf_auth_groups, ag_next) {
1607                 fprintf(stderr, "auth-group %s {\n", ag->ag_name);
1608                 TAILQ_FOREACH(auth, &ag->ag_auths, a_next)
1609                         fprintf(stderr, "\t chap-mutual %s %s %s %s\n",
1610                             auth->a_user, auth->a_secret,
1611                             auth->a_mutual_user, auth->a_mutual_secret);
1612                 TAILQ_FOREACH(auth_name, &ag->ag_names, an_next)
1613                         fprintf(stderr, "\t initiator-name %s\n",
1614                             auth_name->an_initator_name);
1615                 TAILQ_FOREACH(auth_portal, &ag->ag_portals, an_next)
1616                         fprintf(stderr, "\t initiator-portal %s\n",
1617                             auth_portal->an_initator_portal);
1618                 fprintf(stderr, "}\n");
1619         }
1620         TAILQ_FOREACH(pg, &conf->conf_portal_groups, pg_next) {
1621                 fprintf(stderr, "portal-group %s {\n", pg->pg_name);
1622                 TAILQ_FOREACH(portal, &pg->pg_portals, p_next)
1623                         fprintf(stderr, "\t listen %s\n", portal->p_listen);
1624                 fprintf(stderr, "}\n");
1625         }
1626         TAILQ_FOREACH(lun, &conf->conf_luns, l_next) {
1627                 fprintf(stderr, "\tlun %s {\n", lun->l_name);
1628                 fprintf(stderr, "\t\tpath %s\n", lun->l_path);
1629                 TAILQ_FOREACH(o, &lun->l_options, o_next)
1630                         fprintf(stderr, "\t\toption %s %s\n",
1631                             lo->o_name, lo->o_value);
1632                 fprintf(stderr, "\t}\n");
1633         }
1634         TAILQ_FOREACH(targ, &conf->conf_targets, t_next) {
1635                 fprintf(stderr, "target %s {\n", targ->t_name);
1636                 if (targ->t_alias != NULL)
1637                         fprintf(stderr, "\t alias %s\n", targ->t_alias);
1638                 fprintf(stderr, "}\n");
1639         }
1640 }
1641 #endif
1642
1643 static int
1644 conf_verify_lun(struct lun *lun)
1645 {
1646         const struct lun *lun2;
1647
1648         if (lun->l_backend == NULL)
1649                 lun_set_backend(lun, "block");
1650         if (strcmp(lun->l_backend, "block") == 0) {
1651                 if (lun->l_path == NULL) {
1652                         log_warnx("missing path for lun \"%s\"",
1653                             lun->l_name);
1654                         return (1);
1655                 }
1656         } else if (strcmp(lun->l_backend, "ramdisk") == 0) {
1657                 if (lun->l_size == 0) {
1658                         log_warnx("missing size for ramdisk-backed lun \"%s\"",
1659                             lun->l_name);
1660                         return (1);
1661                 }
1662                 if (lun->l_path != NULL) {
1663                         log_warnx("path must not be specified "
1664                             "for ramdisk-backed lun \"%s\"",
1665                             lun->l_name);
1666                         return (1);
1667                 }
1668         }
1669         if (lun->l_blocksize == 0) {
1670                 if (lun->l_device_type == 5)
1671                         lun_set_blocksize(lun, DEFAULT_CD_BLOCKSIZE);
1672                 else
1673                         lun_set_blocksize(lun, DEFAULT_BLOCKSIZE);
1674         } else if (lun->l_blocksize < 0) {
1675                 log_warnx("invalid blocksize for lun \"%s\"; "
1676                     "must be larger than 0", lun->l_name);
1677                 return (1);
1678         }
1679         if (lun->l_size != 0 && lun->l_size % lun->l_blocksize != 0) {
1680                 log_warnx("invalid size for lun \"%s\"; "
1681                     "must be multiple of blocksize", lun->l_name);
1682                 return (1);
1683         }
1684         TAILQ_FOREACH(lun2, &lun->l_conf->conf_luns, l_next) {
1685                 if (lun == lun2)
1686                         continue;
1687                 if (lun->l_path != NULL && lun2->l_path != NULL &&
1688                     strcmp(lun->l_path, lun2->l_path) == 0) {
1689                         log_debugx("WARNING: path \"%s\" duplicated "
1690                             "between lun \"%s\", and "
1691                             "lun \"%s\"", lun->l_path,
1692                             lun->l_name, lun2->l_name);
1693                 }
1694         }
1695
1696         return (0);
1697 }
1698
1699 int
1700 conf_verify(struct conf *conf)
1701 {
1702         struct auth_group *ag;
1703         struct portal_group *pg;
1704         struct port *port;
1705         struct target *targ;
1706         struct lun *lun;
1707         bool found;
1708         int error, i;
1709
1710         if (conf->conf_pidfile_path == NULL)
1711                 conf->conf_pidfile_path = checked_strdup(DEFAULT_PIDFILE);
1712
1713         TAILQ_FOREACH(lun, &conf->conf_luns, l_next) {
1714                 error = conf_verify_lun(lun);
1715                 if (error != 0)
1716                         return (error);
1717         }
1718         TAILQ_FOREACH(targ, &conf->conf_targets, t_next) {
1719                 if (targ->t_auth_group == NULL) {
1720                         targ->t_auth_group = auth_group_find(conf,
1721                             "default");
1722                         assert(targ->t_auth_group != NULL);
1723                 }
1724                 if (TAILQ_EMPTY(&targ->t_ports)) {
1725                         pg = portal_group_find(conf, "default");
1726                         assert(pg != NULL);
1727                         port_new(conf, targ, pg);
1728                 }
1729                 found = false;
1730                 for (i = 0; i < MAX_LUNS; i++) {
1731                         if (targ->t_luns[i] != NULL)
1732                                 found = true;
1733                 }
1734                 if (!found && targ->t_redirection == NULL) {
1735                         log_warnx("no LUNs defined for target \"%s\"",
1736                             targ->t_name);
1737                 }
1738                 if (found && targ->t_redirection != NULL) {
1739                         log_debugx("target \"%s\" contains luns, "
1740                             " but configured for redirection",
1741                             targ->t_name);
1742                 }
1743         }
1744         TAILQ_FOREACH(pg, &conf->conf_portal_groups, pg_next) {
1745                 assert(pg->pg_name != NULL);
1746                 if (pg->pg_discovery_auth_group == NULL) {
1747                         pg->pg_discovery_auth_group =
1748                             auth_group_find(conf, "default");
1749                         assert(pg->pg_discovery_auth_group != NULL);
1750                 }
1751
1752                 if (pg->pg_discovery_filter == PG_FILTER_UNKNOWN)
1753                         pg->pg_discovery_filter = PG_FILTER_NONE;
1754
1755                 if (pg->pg_redirection != NULL) {
1756                         if (!TAILQ_EMPTY(&pg->pg_ports)) {
1757                                 log_debugx("portal-group \"%s\" assigned "
1758                                     "to target, but configured "
1759                                     "for redirection",
1760                                     pg->pg_name);
1761                         }
1762                         pg->pg_unassigned = false;
1763                 } else if (!TAILQ_EMPTY(&pg->pg_ports)) {
1764                         pg->pg_unassigned = false;
1765                 } else {
1766                         if (strcmp(pg->pg_name, "default") != 0)
1767                                 log_warnx("portal-group \"%s\" not assigned "
1768                                     "to any target", pg->pg_name);
1769                         pg->pg_unassigned = true;
1770                 }
1771         }
1772         TAILQ_FOREACH(ag, &conf->conf_auth_groups, ag_next) {
1773                 if (ag->ag_name == NULL)
1774                         assert(ag->ag_target != NULL);
1775                 else
1776                         assert(ag->ag_target == NULL);
1777
1778                 found = false;
1779                 TAILQ_FOREACH(targ, &conf->conf_targets, t_next) {
1780                         if (targ->t_auth_group == ag) {
1781                                 found = true;
1782                                 break;
1783                         }
1784                 }
1785                 TAILQ_FOREACH(port, &conf->conf_ports, p_next) {
1786                         if (port->p_auth_group == ag) {
1787                                 found = true;
1788                                 break;
1789                         }
1790                 }
1791                 TAILQ_FOREACH(pg, &conf->conf_portal_groups, pg_next) {
1792                         if (pg->pg_discovery_auth_group == ag) {
1793                                 found = true;
1794                                 break;
1795                         }
1796                 }
1797                 if (!found && ag->ag_name != NULL &&
1798                     strcmp(ag->ag_name, "default") != 0 &&
1799                     strcmp(ag->ag_name, "no-authentication") != 0 &&
1800                     strcmp(ag->ag_name, "no-access") != 0) {
1801                         log_warnx("auth-group \"%s\" not assigned "
1802                             "to any target", ag->ag_name);
1803                 }
1804         }
1805
1806         return (0);
1807 }
1808
1809 static int
1810 conf_apply(struct conf *oldconf, struct conf *newconf)
1811 {
1812         struct lun *oldlun, *newlun, *tmplun;
1813         struct portal_group *oldpg, *newpg;
1814         struct portal *oldp, *newp;
1815         struct port *oldport, *newport, *tmpport;
1816         struct isns *oldns, *newns;
1817         pid_t otherpid;
1818         int changed, cumulated_error = 0, error, sockbuf;
1819         int one = 1;
1820
1821         if (oldconf->conf_debug != newconf->conf_debug) {
1822                 log_debugx("changing debug level to %d", newconf->conf_debug);
1823                 log_init(newconf->conf_debug);
1824         }
1825
1826         if (oldconf->conf_pidfh != NULL) {
1827                 assert(oldconf->conf_pidfile_path != NULL);
1828                 if (newconf->conf_pidfile_path != NULL &&
1829                     strcmp(oldconf->conf_pidfile_path,
1830                     newconf->conf_pidfile_path) == 0) {
1831                         newconf->conf_pidfh = oldconf->conf_pidfh;
1832                         oldconf->conf_pidfh = NULL;
1833                 } else {
1834                         log_debugx("removing pidfile %s",
1835                             oldconf->conf_pidfile_path);
1836                         pidfile_remove(oldconf->conf_pidfh);
1837                         oldconf->conf_pidfh = NULL;
1838                 }
1839         }
1840
1841         if (newconf->conf_pidfh == NULL && newconf->conf_pidfile_path != NULL) {
1842                 log_debugx("opening pidfile %s", newconf->conf_pidfile_path);
1843                 newconf->conf_pidfh =
1844                     pidfile_open(newconf->conf_pidfile_path, 0600, &otherpid);
1845                 if (newconf->conf_pidfh == NULL) {
1846                         if (errno == EEXIST)
1847                                 log_errx(1, "daemon already running, pid: %jd.",
1848                                     (intmax_t)otherpid);
1849                         log_err(1, "cannot open or create pidfile \"%s\"",
1850                             newconf->conf_pidfile_path);
1851                 }
1852         }
1853
1854         /*
1855          * Go through the new portal groups, assigning tags or preserving old.
1856          */
1857         TAILQ_FOREACH(newpg, &newconf->conf_portal_groups, pg_next) {
1858                 if (newpg->pg_tag != 0)
1859                         continue;
1860                 oldpg = portal_group_find(oldconf, newpg->pg_name);
1861                 if (oldpg != NULL)
1862                         newpg->pg_tag = oldpg->pg_tag;
1863                 else
1864                         newpg->pg_tag = ++last_portal_group_tag;
1865         }
1866
1867         /* Deregister on removed iSNS servers. */
1868         TAILQ_FOREACH(oldns, &oldconf->conf_isns, i_next) {
1869                 TAILQ_FOREACH(newns, &newconf->conf_isns, i_next) {
1870                         if (strcmp(oldns->i_addr, newns->i_addr) == 0)
1871                                 break;
1872                 }
1873                 if (newns == NULL)
1874                         isns_deregister(oldns);
1875         }
1876
1877         /*
1878          * XXX: If target or lun removal fails, we should somehow "move"
1879          *      the old lun or target into newconf, so that subsequent
1880          *      conf_apply() would try to remove them again.  That would
1881          *      be somewhat hairy, though, and lun deletion failures don't
1882          *      really happen, so leave it as it is for now.
1883          */
1884         /*
1885          * First, remove any ports present in the old configuration
1886          * and missing in the new one.
1887          */
1888         TAILQ_FOREACH_SAFE(oldport, &oldconf->conf_ports, p_next, tmpport) {
1889                 if (oldport->p_foreign)
1890                         continue;
1891                 newport = port_find(newconf, oldport->p_name);
1892                 if (newport != NULL && !newport->p_foreign)
1893                         continue;
1894                 log_debugx("removing port \"%s\"", oldport->p_name);
1895                 error = kernel_port_remove(oldport);
1896                 if (error != 0) {
1897                         log_warnx("failed to remove port %s",
1898                             oldport->p_name);
1899                         /*
1900                          * XXX: Uncomment after fixing the root cause.
1901                          *
1902                          * cumulated_error++;
1903                          */
1904                 }
1905         }
1906
1907         /*
1908          * Second, remove any LUNs present in the old configuration
1909          * and missing in the new one.
1910          */
1911         TAILQ_FOREACH_SAFE(oldlun, &oldconf->conf_luns, l_next, tmplun) {
1912                 newlun = lun_find(newconf, oldlun->l_name);
1913                 if (newlun == NULL) {
1914                         log_debugx("lun \"%s\", CTL lun %d "
1915                             "not found in new configuration; "
1916                             "removing", oldlun->l_name, oldlun->l_ctl_lun);
1917                         error = kernel_lun_remove(oldlun);
1918                         if (error != 0) {
1919                                 log_warnx("failed to remove lun \"%s\", "
1920                                     "CTL lun %d",
1921                                     oldlun->l_name, oldlun->l_ctl_lun);
1922                                 cumulated_error++;
1923                         }
1924                         continue;
1925                 }
1926
1927                 /*
1928                  * Also remove the LUNs changed by more than size.
1929                  */
1930                 changed = 0;
1931                 assert(oldlun->l_backend != NULL);
1932                 assert(newlun->l_backend != NULL);
1933                 if (strcmp(newlun->l_backend, oldlun->l_backend) != 0) {
1934                         log_debugx("backend for lun \"%s\", "
1935                             "CTL lun %d changed; removing",
1936                             oldlun->l_name, oldlun->l_ctl_lun);
1937                         changed = 1;
1938                 }
1939                 if (oldlun->l_blocksize != newlun->l_blocksize) {
1940                         log_debugx("blocksize for lun \"%s\", "
1941                             "CTL lun %d changed; removing",
1942                             oldlun->l_name, oldlun->l_ctl_lun);
1943                         changed = 1;
1944                 }
1945                 if (newlun->l_device_id != NULL &&
1946                     (oldlun->l_device_id == NULL ||
1947                      strcmp(oldlun->l_device_id, newlun->l_device_id) !=
1948                      0)) {
1949                         log_debugx("device-id for lun \"%s\", "
1950                             "CTL lun %d changed; removing",
1951                             oldlun->l_name, oldlun->l_ctl_lun);
1952                         changed = 1;
1953                 }
1954                 if (newlun->l_path != NULL &&
1955                     (oldlun->l_path == NULL ||
1956                      strcmp(oldlun->l_path, newlun->l_path) != 0)) {
1957                         log_debugx("path for lun \"%s\", "
1958                             "CTL lun %d, changed; removing",
1959                             oldlun->l_name, oldlun->l_ctl_lun);
1960                         changed = 1;
1961                 }
1962                 if (newlun->l_serial != NULL &&
1963                     (oldlun->l_serial == NULL ||
1964                      strcmp(oldlun->l_serial, newlun->l_serial) != 0)) {
1965                         log_debugx("serial for lun \"%s\", "
1966                             "CTL lun %d changed; removing",
1967                             oldlun->l_name, oldlun->l_ctl_lun);
1968                         changed = 1;
1969                 }
1970                 if (changed) {
1971                         error = kernel_lun_remove(oldlun);
1972                         if (error != 0) {
1973                                 log_warnx("failed to remove lun \"%s\", "
1974                                     "CTL lun %d",
1975                                     oldlun->l_name, oldlun->l_ctl_lun);
1976                                 cumulated_error++;
1977                         }
1978                         lun_delete(oldlun);
1979                         continue;
1980                 }
1981
1982                 lun_set_ctl_lun(newlun, oldlun->l_ctl_lun);
1983         }
1984
1985         TAILQ_FOREACH_SAFE(newlun, &newconf->conf_luns, l_next, tmplun) {
1986                 oldlun = lun_find(oldconf, newlun->l_name);
1987                 if (oldlun != NULL) {
1988                         log_debugx("modifying lun \"%s\", CTL lun %d",
1989                             newlun->l_name, newlun->l_ctl_lun);
1990                         error = kernel_lun_modify(newlun);
1991                         if (error != 0) {
1992                                 log_warnx("failed to "
1993                                     "modify lun \"%s\", CTL lun %d",
1994                                     newlun->l_name, newlun->l_ctl_lun);
1995                                 cumulated_error++;
1996                         }
1997                         continue;
1998                 }
1999                 log_debugx("adding lun \"%s\"", newlun->l_name);
2000                 error = kernel_lun_add(newlun);
2001                 if (error != 0) {
2002                         log_warnx("failed to add lun \"%s\"", newlun->l_name);
2003                         lun_delete(newlun);
2004                         cumulated_error++;
2005                 }
2006         }
2007
2008         /*
2009          * Now add new ports or modify existing ones.
2010          */
2011         TAILQ_FOREACH(newport, &newconf->conf_ports, p_next) {
2012                 if (newport->p_foreign)
2013                         continue;
2014                 oldport = port_find(oldconf, newport->p_name);
2015
2016                 if (oldport == NULL || oldport->p_foreign) {
2017                         log_debugx("adding port \"%s\"", newport->p_name);
2018                         error = kernel_port_add(newport);
2019                 } else {
2020                         log_debugx("updating port \"%s\"", newport->p_name);
2021                         newport->p_ctl_port = oldport->p_ctl_port;
2022                         error = kernel_port_update(newport, oldport);
2023                 }
2024                 if (error != 0) {
2025                         log_warnx("failed to %s port %s",
2026                             (oldport == NULL) ? "add" : "update",
2027                             newport->p_name);
2028                         /*
2029                          * XXX: Uncomment after fixing the root cause.
2030                          *
2031                          * cumulated_error++;
2032                          */
2033                 }
2034         }
2035
2036         /*
2037          * Go through the new portals, opening the sockets as necessary.
2038          */
2039         TAILQ_FOREACH(newpg, &newconf->conf_portal_groups, pg_next) {
2040                 if (newpg->pg_foreign)
2041                         continue;
2042                 if (newpg->pg_unassigned) {
2043                         log_debugx("not listening on portal-group \"%s\", "
2044                             "not assigned to any target",
2045                             newpg->pg_name);
2046                         continue;
2047                 }
2048                 TAILQ_FOREACH(newp, &newpg->pg_portals, p_next) {
2049                         /*
2050                          * Try to find already open portal and reuse
2051                          * the listening socket.  We don't care about
2052                          * what portal or portal group that was, what
2053                          * matters is the listening address.
2054                          */
2055                         TAILQ_FOREACH(oldpg, &oldconf->conf_portal_groups,
2056                             pg_next) {
2057                                 TAILQ_FOREACH(oldp, &oldpg->pg_portals,
2058                                     p_next) {
2059                                         if (strcmp(newp->p_listen,
2060                                             oldp->p_listen) == 0 &&
2061                                             oldp->p_socket > 0) {
2062                                                 newp->p_socket =
2063                                                     oldp->p_socket;
2064                                                 oldp->p_socket = 0;
2065                                                 break;
2066                                         }
2067                                 }
2068                         }
2069                         if (newp->p_socket > 0) {
2070                                 /*
2071                                  * We're done with this portal.
2072                                  */
2073                                 continue;
2074                         }
2075
2076 #ifdef ICL_KERNEL_PROXY
2077                         if (proxy_mode) {
2078                                 newpg->pg_conf->conf_portal_id++;
2079                                 newp->p_id = newpg->pg_conf->conf_portal_id;
2080                                 log_debugx("listening on %s, portal-group "
2081                                     "\"%s\", portal id %d, using ICL proxy",
2082                                     newp->p_listen, newpg->pg_name, newp->p_id);
2083                                 kernel_listen(newp->p_ai, newp->p_iser,
2084                                     newp->p_id);
2085                                 continue;
2086                         }
2087 #endif
2088                         assert(proxy_mode == false);
2089                         assert(newp->p_iser == false);
2090
2091                         log_debugx("listening on %s, portal-group \"%s\"",
2092                             newp->p_listen, newpg->pg_name);
2093                         newp->p_socket = socket(newp->p_ai->ai_family,
2094                             newp->p_ai->ai_socktype,
2095                             newp->p_ai->ai_protocol);
2096                         if (newp->p_socket < 0) {
2097                                 log_warn("socket(2) failed for %s",
2098                                     newp->p_listen);
2099                                 cumulated_error++;
2100                                 continue;
2101                         }
2102                         sockbuf = SOCKBUF_SIZE;
2103                         if (setsockopt(newp->p_socket, SOL_SOCKET, SO_RCVBUF,
2104                             &sockbuf, sizeof(sockbuf)) == -1)
2105                                 log_warn("setsockopt(SO_RCVBUF) failed "
2106                                     "for %s", newp->p_listen);
2107                         sockbuf = SOCKBUF_SIZE;
2108                         if (setsockopt(newp->p_socket, SOL_SOCKET, SO_SNDBUF,
2109                             &sockbuf, sizeof(sockbuf)) == -1)
2110                                 log_warn("setsockopt(SO_SNDBUF) failed "
2111                                     "for %s", newp->p_listen);
2112                         error = setsockopt(newp->p_socket, SOL_SOCKET,
2113                             SO_REUSEADDR, &one, sizeof(one));
2114                         if (error != 0) {
2115                                 log_warn("setsockopt(SO_REUSEADDR) failed "
2116                                     "for %s", newp->p_listen);
2117                                 close(newp->p_socket);
2118                                 newp->p_socket = 0;
2119                                 cumulated_error++;
2120                                 continue;
2121                         }
2122                         error = bind(newp->p_socket, newp->p_ai->ai_addr,
2123                             newp->p_ai->ai_addrlen);
2124                         if (error != 0) {
2125                                 log_warn("bind(2) failed for %s",
2126                                     newp->p_listen);
2127                                 close(newp->p_socket);
2128                                 newp->p_socket = 0;
2129                                 cumulated_error++;
2130                                 continue;
2131                         }
2132                         error = listen(newp->p_socket, -1);
2133                         if (error != 0) {
2134                                 log_warn("listen(2) failed for %s",
2135                                     newp->p_listen);
2136                                 close(newp->p_socket);
2137                                 newp->p_socket = 0;
2138                                 cumulated_error++;
2139                                 continue;
2140                         }
2141                 }
2142         }
2143
2144         /*
2145          * Go through the no longer used sockets, closing them.
2146          */
2147         TAILQ_FOREACH(oldpg, &oldconf->conf_portal_groups, pg_next) {
2148                 TAILQ_FOREACH(oldp, &oldpg->pg_portals, p_next) {
2149                         if (oldp->p_socket <= 0)
2150                                 continue;
2151                         log_debugx("closing socket for %s, portal-group \"%s\"",
2152                             oldp->p_listen, oldpg->pg_name);
2153                         close(oldp->p_socket);
2154                         oldp->p_socket = 0;
2155                 }
2156         }
2157
2158         /* (Re-)Register on remaining/new iSNS servers. */
2159         TAILQ_FOREACH(newns, &newconf->conf_isns, i_next) {
2160                 TAILQ_FOREACH(oldns, &oldconf->conf_isns, i_next) {
2161                         if (strcmp(oldns->i_addr, newns->i_addr) == 0)
2162                                 break;
2163                 }
2164                 isns_register(newns, oldns);
2165         }
2166
2167         /* Schedule iSNS update */
2168         if (!TAILQ_EMPTY(&newconf->conf_isns))
2169                 set_timeout((newconf->conf_isns_period + 2) / 3, false);
2170
2171         return (cumulated_error);
2172 }
2173
2174 bool
2175 timed_out(void)
2176 {
2177
2178         return (sigalrm_received);
2179 }
2180
2181 static void
2182 sigalrm_handler_fatal(int dummy __unused)
2183 {
2184         /*
2185          * It would be easiest to just log an error and exit.  We can't
2186          * do this, though, because log_errx() is not signal safe, since
2187          * it calls syslog(3).  Instead, set a flag checked by pdu_send()
2188          * and pdu_receive(), to call log_errx() there.  Should they fail
2189          * to notice, we'll exit here one second later.
2190          */
2191         if (sigalrm_received) {
2192                 /*
2193                  * Oh well.  Just give up and quit.
2194                  */
2195                 _exit(2);
2196         }
2197
2198         sigalrm_received = true;
2199 }
2200
2201 static void
2202 sigalrm_handler(int dummy __unused)
2203 {
2204
2205         sigalrm_received = true;
2206 }
2207
2208 void
2209 set_timeout(int timeout, int fatal)
2210 {
2211         struct sigaction sa;
2212         struct itimerval itv;
2213         int error;
2214
2215         if (timeout <= 0) {
2216                 log_debugx("session timeout disabled");
2217                 bzero(&itv, sizeof(itv));
2218                 error = setitimer(ITIMER_REAL, &itv, NULL);
2219                 if (error != 0)
2220                         log_err(1, "setitimer");
2221                 sigalrm_received = false;
2222                 return;
2223         }
2224
2225         sigalrm_received = false;
2226         bzero(&sa, sizeof(sa));
2227         if (fatal)
2228                 sa.sa_handler = sigalrm_handler_fatal;
2229         else
2230                 sa.sa_handler = sigalrm_handler;
2231         sigfillset(&sa.sa_mask);
2232         error = sigaction(SIGALRM, &sa, NULL);
2233         if (error != 0)
2234                 log_err(1, "sigaction");
2235
2236         /*
2237          * First SIGALRM will arive after conf_timeout seconds.
2238          * If we do nothing, another one will arrive a second later.
2239          */
2240         log_debugx("setting session timeout to %d seconds", timeout);
2241         bzero(&itv, sizeof(itv));
2242         itv.it_interval.tv_sec = 1;
2243         itv.it_value.tv_sec = timeout;
2244         error = setitimer(ITIMER_REAL, &itv, NULL);
2245         if (error != 0)
2246                 log_err(1, "setitimer");
2247 }
2248
2249 static int
2250 wait_for_children(bool block)
2251 {
2252         pid_t pid;
2253         int status;
2254         int num = 0;
2255
2256         for (;;) {
2257                 /*
2258                  * If "block" is true, wait for at least one process.
2259                  */
2260                 if (block && num == 0)
2261                         pid = wait4(-1, &status, 0, NULL);
2262                 else
2263                         pid = wait4(-1, &status, WNOHANG, NULL);
2264                 if (pid <= 0)
2265                         break;
2266                 if (WIFSIGNALED(status)) {
2267                         log_warnx("child process %d terminated with signal %d",
2268                             pid, WTERMSIG(status));
2269                 } else if (WEXITSTATUS(status) != 0) {
2270                         log_warnx("child process %d terminated with exit status %d",
2271                             pid, WEXITSTATUS(status));
2272                 } else {
2273                         log_debugx("child process %d terminated gracefully", pid);
2274                 }
2275                 num++;
2276         }
2277
2278         return (num);
2279 }
2280
2281 static void
2282 handle_connection(struct portal *portal, int fd,
2283     const struct sockaddr *client_sa, bool dont_fork)
2284 {
2285         struct connection *conn;
2286         int error;
2287         pid_t pid;
2288         char host[NI_MAXHOST + 1];
2289         struct conf *conf;
2290
2291         conf = portal->p_portal_group->pg_conf;
2292
2293         if (dont_fork) {
2294                 log_debugx("incoming connection; not forking due to -d flag");
2295         } else {
2296                 nchildren -= wait_for_children(false);
2297                 assert(nchildren >= 0);
2298
2299                 while (conf->conf_maxproc > 0 && nchildren >= conf->conf_maxproc) {
2300                         log_debugx("maxproc limit of %d child processes hit; "
2301                             "waiting for child process to exit", conf->conf_maxproc);
2302                         nchildren -= wait_for_children(true);
2303                         assert(nchildren >= 0);
2304                 }
2305                 log_debugx("incoming connection; forking child process #%d",
2306                     nchildren);
2307                 nchildren++;
2308                 pid = fork();
2309                 if (pid < 0)
2310                         log_err(1, "fork");
2311                 if (pid > 0) {
2312                         close(fd);
2313                         return;
2314                 }
2315         }
2316         pidfile_close(conf->conf_pidfh);
2317
2318         error = getnameinfo(client_sa, client_sa->sa_len,
2319             host, sizeof(host), NULL, 0, NI_NUMERICHOST);
2320         if (error != 0)
2321                 log_errx(1, "getnameinfo: %s", gai_strerror(error));
2322
2323         log_debugx("accepted connection from %s; portal group \"%s\"",
2324             host, portal->p_portal_group->pg_name);
2325         log_set_peer_addr(host);
2326         setproctitle("%s", host);
2327
2328         conn = connection_new(portal, fd, host, client_sa);
2329         set_timeout(conf->conf_timeout, true);
2330         kernel_capsicate();
2331         login(conn);
2332         if (conn->conn_session_type == CONN_SESSION_TYPE_NORMAL) {
2333                 kernel_handoff(conn);
2334                 log_debugx("connection handed off to the kernel");
2335         } else {
2336                 assert(conn->conn_session_type == CONN_SESSION_TYPE_DISCOVERY);
2337                 discovery(conn);
2338         }
2339         log_debugx("nothing more to do; exiting");
2340         exit(0);
2341 }
2342
2343 static int
2344 fd_add(int fd, fd_set *fdset, int nfds)
2345 {
2346
2347         /*
2348          * Skip sockets which we failed to bind.
2349          */
2350         if (fd <= 0)
2351                 return (nfds);
2352
2353         FD_SET(fd, fdset);
2354         if (fd > nfds)
2355                 nfds = fd;
2356         return (nfds);
2357 }
2358
2359 static void
2360 main_loop(struct conf *conf, bool dont_fork)
2361 {
2362         struct portal_group *pg;
2363         struct portal *portal;
2364         struct sockaddr_storage client_sa;
2365         socklen_t client_salen;
2366 #ifdef ICL_KERNEL_PROXY
2367         int connection_id;
2368         int portal_id;
2369 #endif
2370         fd_set fdset;
2371         int error, nfds, client_fd;
2372
2373         pidfile_write(conf->conf_pidfh);
2374
2375         for (;;) {
2376                 if (sighup_received || sigterm_received || timed_out())
2377                         return;
2378
2379 #ifdef ICL_KERNEL_PROXY
2380                 if (proxy_mode) {
2381                         client_salen = sizeof(client_sa);
2382                         kernel_accept(&connection_id, &portal_id,
2383                             (struct sockaddr *)&client_sa, &client_salen);
2384                         assert(client_salen >= client_sa.ss_len);
2385
2386                         log_debugx("incoming connection, id %d, portal id %d",
2387                             connection_id, portal_id);
2388                         TAILQ_FOREACH(pg, &conf->conf_portal_groups, pg_next) {
2389                                 TAILQ_FOREACH(portal, &pg->pg_portals, p_next) {
2390                                         if (portal->p_id == portal_id) {
2391                                                 goto found;
2392                                         }
2393                                 }
2394                         }
2395
2396                         log_errx(1, "kernel returned invalid portal_id %d",
2397                             portal_id);
2398
2399 found:
2400                         handle_connection(portal, connection_id,
2401                             (struct sockaddr *)&client_sa, dont_fork);
2402                 } else {
2403 #endif
2404                         assert(proxy_mode == false);
2405
2406                         FD_ZERO(&fdset);
2407                         nfds = 0;
2408                         TAILQ_FOREACH(pg, &conf->conf_portal_groups, pg_next) {
2409                                 TAILQ_FOREACH(portal, &pg->pg_portals, p_next)
2410                                         nfds = fd_add(portal->p_socket, &fdset, nfds);
2411                         }
2412                         error = select(nfds + 1, &fdset, NULL, NULL, NULL);
2413                         if (error <= 0) {
2414                                 if (errno == EINTR)
2415                                         return;
2416                                 log_err(1, "select");
2417                         }
2418                         TAILQ_FOREACH(pg, &conf->conf_portal_groups, pg_next) {
2419                                 TAILQ_FOREACH(portal, &pg->pg_portals, p_next) {
2420                                         if (!FD_ISSET(portal->p_socket, &fdset))
2421                                                 continue;
2422                                         client_salen = sizeof(client_sa);
2423                                         client_fd = accept(portal->p_socket,
2424                                             (struct sockaddr *)&client_sa,
2425                                             &client_salen);
2426                                         if (client_fd < 0) {
2427                                                 if (errno == ECONNABORTED)
2428                                                         continue;
2429                                                 log_err(1, "accept");
2430                                         }
2431                                         assert(client_salen >= client_sa.ss_len);
2432
2433                                         handle_connection(portal, client_fd,
2434                                             (struct sockaddr *)&client_sa,
2435                                             dont_fork);
2436                                         break;
2437                                 }
2438                         }
2439 #ifdef ICL_KERNEL_PROXY
2440                 }
2441 #endif
2442         }
2443 }
2444
2445 static void
2446 sighup_handler(int dummy __unused)
2447 {
2448
2449         sighup_received = true;
2450 }
2451
2452 static void
2453 sigterm_handler(int dummy __unused)
2454 {
2455
2456         sigterm_received = true;
2457 }
2458
2459 static void
2460 sigchld_handler(int dummy __unused)
2461 {
2462
2463         /*
2464          * The only purpose of this handler is to make SIGCHLD
2465          * interrupt the ISCSIDWAIT ioctl(2), so we can call
2466          * wait_for_children().
2467          */
2468 }
2469
2470 static void
2471 register_signals(void)
2472 {
2473         struct sigaction sa;
2474         int error;
2475
2476         bzero(&sa, sizeof(sa));
2477         sa.sa_handler = sighup_handler;
2478         sigfillset(&sa.sa_mask);
2479         error = sigaction(SIGHUP, &sa, NULL);
2480         if (error != 0)
2481                 log_err(1, "sigaction");
2482
2483         sa.sa_handler = sigterm_handler;
2484         error = sigaction(SIGTERM, &sa, NULL);
2485         if (error != 0)
2486                 log_err(1, "sigaction");
2487
2488         sa.sa_handler = sigterm_handler;
2489         error = sigaction(SIGINT, &sa, NULL);
2490         if (error != 0)
2491                 log_err(1, "sigaction");
2492
2493         sa.sa_handler = sigchld_handler;
2494         error = sigaction(SIGCHLD, &sa, NULL);
2495         if (error != 0)
2496                 log_err(1, "sigaction");
2497 }
2498
2499 static void
2500 check_perms(const char *path)
2501 {
2502         struct stat sb;
2503         int error;
2504
2505         error = stat(path, &sb);
2506         if (error != 0) {
2507                 log_warn("stat");
2508                 return;
2509         }
2510         if (sb.st_mode & S_IWOTH) {
2511                 log_warnx("%s is world-writable", path);
2512         } else if (sb.st_mode & S_IROTH) {
2513                 log_warnx("%s is world-readable", path);
2514         } else if (sb.st_mode & S_IXOTH) {
2515                 /*
2516                  * Ok, this one doesn't matter, but still do it,
2517                  * just for consistency.
2518                  */
2519                 log_warnx("%s is world-executable", path);
2520         }
2521
2522         /*
2523          * XXX: Should we also check for owner != 0?
2524          */
2525 }
2526
2527 static struct conf *
2528 conf_new_from_file(const char *path, struct conf *oldconf, bool ucl)
2529 {
2530         struct conf *conf;
2531         struct auth_group *ag;
2532         struct portal_group *pg;
2533         struct pport *pp;
2534         int error;
2535
2536         log_debugx("obtaining configuration from %s", path);
2537
2538         conf = conf_new();
2539
2540         TAILQ_FOREACH(pp, &oldconf->conf_pports, pp_next)
2541                 pport_copy(pp, conf);
2542
2543         ag = auth_group_new(conf, "default");
2544         assert(ag != NULL);
2545
2546         ag = auth_group_new(conf, "no-authentication");
2547         assert(ag != NULL);
2548         ag->ag_type = AG_TYPE_NO_AUTHENTICATION;
2549
2550         ag = auth_group_new(conf, "no-access");
2551         assert(ag != NULL);
2552         ag->ag_type = AG_TYPE_DENY;
2553
2554         pg = portal_group_new(conf, "default");
2555         assert(pg != NULL);
2556
2557         if (ucl)
2558                 error = uclparse_conf(conf, path);
2559         else
2560                 error = parse_conf(conf, path);
2561
2562         if (error != 0) {
2563                 conf_delete(conf);
2564                 return (NULL);
2565         }
2566
2567         check_perms(path);
2568
2569         if (conf->conf_default_ag_defined == false) {
2570                 log_debugx("auth-group \"default\" not defined; "
2571                     "going with defaults");
2572                 ag = auth_group_find(conf, "default");
2573                 assert(ag != NULL);
2574                 ag->ag_type = AG_TYPE_DENY;
2575         }
2576
2577         if (conf->conf_default_pg_defined == false) {
2578                 log_debugx("portal-group \"default\" not defined; "
2579                     "going with defaults");
2580                 pg = portal_group_find(conf, "default");
2581                 assert(pg != NULL);
2582                 portal_group_add_listen(pg, "0.0.0.0:3260", false);
2583                 portal_group_add_listen(pg, "[::]:3260", false);
2584         }
2585
2586         conf->conf_kernel_port_on = true;
2587
2588         error = conf_verify(conf);
2589         if (error != 0) {
2590                 conf_delete(conf);
2591                 return (NULL);
2592         }
2593
2594         return (conf);
2595 }
2596
2597 int
2598 main(int argc, char **argv)
2599 {
2600         struct conf *oldconf, *newconf, *tmpconf;
2601         struct isns *newns;
2602         const char *config_path = DEFAULT_CONFIG_PATH;
2603         int debug = 0, ch, error;
2604         bool dont_daemonize = false;
2605         bool use_ucl = false;
2606
2607         while ((ch = getopt(argc, argv, "duf:R")) != -1) {
2608                 switch (ch) {
2609                 case 'd':
2610                         dont_daemonize = true;
2611                         debug++;
2612                         break;
2613                 case 'u':
2614                         use_ucl = true;
2615                         break;
2616                 case 'f':
2617                         config_path = optarg;
2618                         break;
2619                 case 'R':
2620 #ifndef ICL_KERNEL_PROXY
2621                         log_errx(1, "ctld(8) compiled without ICL_KERNEL_PROXY "
2622                             "does not support iSER protocol");
2623 #endif
2624                         proxy_mode = true;
2625                         break;
2626                 case '?':
2627                 default:
2628                         usage();
2629                 }
2630         }
2631         argc -= optind;
2632         if (argc != 0)
2633                 usage();
2634
2635         log_init(debug);
2636         kernel_init();
2637
2638         oldconf = conf_new_from_kernel();
2639         newconf = conf_new_from_file(config_path, oldconf, use_ucl);
2640
2641         if (newconf == NULL)
2642                 log_errx(1, "configuration error; exiting");
2643         if (debug > 0) {
2644                 oldconf->conf_debug = debug;
2645                 newconf->conf_debug = debug;
2646         }
2647
2648         error = conf_apply(oldconf, newconf);
2649         if (error != 0)
2650                 log_errx(1, "failed to apply configuration; exiting");
2651
2652         conf_delete(oldconf);
2653         oldconf = NULL;
2654
2655         register_signals();
2656
2657         if (dont_daemonize == false) {
2658                 log_debugx("daemonizing");
2659                 if (daemon(0, 0) == -1) {
2660                         log_warn("cannot daemonize");
2661                         pidfile_remove(newconf->conf_pidfh);
2662                         exit(1);
2663                 }
2664         }
2665
2666         /* Schedule iSNS update */
2667         if (!TAILQ_EMPTY(&newconf->conf_isns))
2668                 set_timeout((newconf->conf_isns_period + 2) / 3, false);
2669
2670         for (;;) {
2671                 main_loop(newconf, dont_daemonize);
2672                 if (sighup_received) {
2673                         sighup_received = false;
2674                         log_debugx("received SIGHUP, reloading configuration");
2675                         tmpconf = conf_new_from_file(config_path, newconf,
2676                             use_ucl);
2677
2678                         if (tmpconf == NULL) {
2679                                 log_warnx("configuration error, "
2680                                     "continuing with old configuration");
2681                         } else {
2682                                 if (debug > 0)
2683                                         tmpconf->conf_debug = debug;
2684                                 oldconf = newconf;
2685                                 newconf = tmpconf;
2686                                 error = conf_apply(oldconf, newconf);
2687                                 if (error != 0)
2688                                         log_warnx("failed to reload "
2689                                             "configuration");
2690                                 conf_delete(oldconf);
2691                                 oldconf = NULL;
2692                         }
2693                 } else if (sigterm_received) {
2694                         log_debugx("exiting on signal; "
2695                             "reloading empty configuration");
2696
2697                         log_debugx("removing CTL iSCSI ports "
2698                             "and terminating all connections");
2699
2700                         oldconf = newconf;
2701                         newconf = conf_new();
2702                         if (debug > 0)
2703                                 newconf->conf_debug = debug;
2704                         error = conf_apply(oldconf, newconf);
2705                         if (error != 0)
2706                                 log_warnx("failed to apply configuration");
2707                         conf_delete(oldconf);
2708                         oldconf = NULL;
2709
2710                         log_warnx("exiting on signal");
2711                         exit(0);
2712                 } else {
2713                         nchildren -= wait_for_children(false);
2714                         assert(nchildren >= 0);
2715                         if (timed_out()) {
2716                                 set_timeout(0, false);
2717                                 TAILQ_FOREACH(newns, &newconf->conf_isns, i_next)
2718                                         isns_check(newns);
2719                                 /* Schedule iSNS update */
2720                                 if (!TAILQ_EMPTY(&newconf->conf_isns)) {
2721                                         set_timeout((newconf->conf_isns_period
2722                                             + 2) / 3,
2723                                             false);
2724                                 }
2725                         }
2726                 }
2727         }
2728         /* NOTREACHED */
2729 }