usr.sbin/ctld/ctld.c

   1 /*-
   2  * Copyright (c) 2012 The FreeBSD Foundation
   3  * All rights reserved.
   4  *
   5  * This software was developed by Edward Tomasz Napierala under sponsorship
   6  * from the FreeBSD Foundation.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions
  10  * are met:
  11  * 1. Redistributions of source code must retain the above copyright
  12  *    notice, this list of conditions and the following disclaimer.
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in the
  15  *    documentation and/or other materials provided with the distribution.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  27  * SUCH DAMAGE.
  28  *
  29  * $FreeBSD$
  30  */
  31
  32 #include <sys/types.h>
  33 #include <sys/time.h>
  34 #include <sys/socket.h>
  35 #include <sys/wait.h>
  36 #include <netinet/in.h>
  37 #include <assert.h>
  38 #include <ctype.h>
  39 #include <errno.h>
  40 #include <netdb.h>
  41 #include <signal.h>
  42 #include <stdbool.h>
  43 #include <stdio.h>
  44 #include <stdint.h>
  45 #include <stdlib.h>
  46 #include <string.h>
  47 #include <unistd.h>
  48
  49 #include "ctld.h"
  50
  51 static volatile bool sighup_received = false;
  52 static volatile bool sigterm_received = false;
  53 static volatile bool sigalrm_received = false;
  54
  55 static int nchildren = 0;
  56
  57 static void
  58 usage(void)
  59 {
  60
  61         fprintf(stderr, "usage: ctld [-d][-f config-file]\n");
  62         exit(1);
  63 }
  64
  65 char *
  66 checked_strdup(const char *s)
  67 {
  68         char *c;
  69
  70         c = strdup(s);
  71         if (c == NULL)
  72                 log_err(1, "strdup");
  73         return (c);
  74 }
  75
  76 struct conf *
  77 conf_new(void)
  78 {
  79         struct conf *conf;
  80
  81         conf = calloc(1, sizeof(*conf));
  82         if (conf == NULL)
  83                 log_err(1, "calloc");
  84         TAILQ_INIT(&conf->conf_targets);
  85         TAILQ_INIT(&conf->conf_auth_groups);
  86         TAILQ_INIT(&conf->conf_portal_groups);
  87
  88         conf->conf_debug = 0;
  89         conf->conf_timeout = 60;
  90         conf->conf_maxproc = 30;
  91
  92         return (conf);
  93 }
  94
  95 void
  96 conf_delete(struct conf *conf)
  97 {
  98         struct target *targ, *tmp;
  99         struct auth_group *ag, *cagtmp;
 100         struct portal_group *pg, *cpgtmp;
 101
 102         assert(conf->conf_pidfh == NULL);
 103
 104         TAILQ_FOREACH_SAFE(targ, &conf->conf_targets, t_next, tmp)
 105                 target_delete(targ);
 106         TAILQ_FOREACH_SAFE(ag, &conf->conf_auth_groups, ag_next, cagtmp)
 107                 auth_group_delete(ag);
 108         TAILQ_FOREACH_SAFE(pg, &conf->conf_portal_groups, pg_next, cpgtmp)
 109                 portal_group_delete(pg);
 110         free(conf->conf_pidfile_path);
 111         free(conf);
 112 }
 113
 114 static struct auth *
 115 auth_new(struct auth_group *ag)
 116 {
 117         struct auth *auth;
 118
 119         auth = calloc(1, sizeof(*auth));
 120         if (auth == NULL)
 121                 log_err(1, "calloc");
 122         auth->a_auth_group = ag;
 123         TAILQ_INSERT_TAIL(&ag->ag_auths, auth, a_next);
 124         return (auth);
 125 }
 126
 127 static void
 128 auth_delete(struct auth *auth)
 129 {
 130         TAILQ_REMOVE(&auth->a_auth_group->ag_auths, auth, a_next);
 131
 132         free(auth->a_user);
 133         free(auth->a_secret);
 134         free(auth->a_mutual_user);
 135         free(auth->a_mutual_secret);
 136         free(auth);
 137 }
 138
 139 const struct auth *
 140 auth_find(struct auth_group *ag, const char *user)
 141 {
 142         const struct auth *auth;
 143
 144         TAILQ_FOREACH(auth, &ag->ag_auths, a_next) {
 145                 if (strcmp(auth->a_user, user) == 0)
 146                         return (auth);
 147         }
 148
 149         return (NULL);
 150 }
 151
 152 static void
 153 auth_check_secret_length(struct auth *auth)
 154 {
 155         size_t len;
 156
 157         len = strlen(auth->a_secret);
 158         if (len > 16) {
 159                 if (auth->a_auth_group->ag_name != NULL)
 160                         log_warnx("secret for user \"%s\", auth-group \"%s\", "
 161                             "is too long; it should be at most 16 characters "
 162                             "long", auth->a_user, auth->a_auth_group->ag_name);
 163                 else
 164                         log_warnx("secret for user \"%s\", target \"%s\", "
 165                             "is too long; it should be at most 16 characters "
 166                             "long", auth->a_user,
 167                             auth->a_auth_group->ag_target->t_name);
 168         }
 169         if (len < 12) {
 170                 if (auth->a_auth_group->ag_name != NULL)
 171                         log_warnx("secret for user \"%s\", auth-group \"%s\", "
 172                             "is too short; it should be at least 12 characters "
 173                             "long", auth->a_user,
 174                             auth->a_auth_group->ag_name);
 175                 else
 176                         log_warnx("secret for user \"%s\", target \"%s\", "
 177                             "is too short; it should be at least 16 characters "
 178                             "long", auth->a_user,
 179                             auth->a_auth_group->ag_target->t_name);
 180         }
 181
 182         if (auth->a_mutual_secret != NULL) {
 183                 len = strlen(auth->a_secret);
 184                 if (len > 16) {
 185                         if (auth->a_auth_group->ag_name != NULL)
 186                                 log_warnx("mutual secret for user \"%s\", "
 187                                     "auth-group \"%s\", is too long; it should "
 188                                     "be at most 16 characters long",
 189                                     auth->a_user, auth->a_auth_group->ag_name);
 190                         else
 191                                 log_warnx("mutual secret for user \"%s\", "
 192                                     "target \"%s\", is too long; it should "
 193                                     "be at most 16 characters long",
 194                                     auth->a_user,
 195                                     auth->a_auth_group->ag_target->t_name);
 196                 }
 197                 if (len < 12) {
 198                         if (auth->a_auth_group->ag_name != NULL)
 199                                 log_warnx("mutual secret for user \"%s\", "
 200                                     "auth-group \"%s\", is too short; it "
 201                                     "should be at least 12 characters long",
 202                                     auth->a_user, auth->a_auth_group->ag_name);
 203                         else
 204                                 log_warnx("mutual secret for user \"%s\", "
 205                                     "target \"%s\", is too short; it should be "
 206                                     "at least 16 characters long",
 207                                     auth->a_user,
 208                                     auth->a_auth_group->ag_target->t_name);
 209                 }
 210         }
 211 }
 212
 213 const struct auth *
 214 auth_new_chap(struct auth_group *ag, const char *user,
 215     const char *secret)
 216 {
 217         struct auth *auth;
 218
 219         if (ag->ag_type == AG_TYPE_UNKNOWN)
 220                 ag->ag_type = AG_TYPE_CHAP;
 221         if (ag->ag_type != AG_TYPE_CHAP) {
 222                 if (ag->ag_name != NULL)
 223                         log_warnx("cannot mix \"chap\" authentication with "
 224                             "other types for auth-group \"%s\"", ag->ag_name);
 225                 else
 226                         log_warnx("cannot mix \"chap\" authentication with "
 227                             "other types for target \"%s\"",
 228                             ag->ag_target->t_name);
 229                 return (NULL);
 230         }
 231
 232         auth = auth_new(ag);
 233         auth->a_user = checked_strdup(user);
 234         auth->a_secret = checked_strdup(secret);
 235
 236         auth_check_secret_length(auth);
 237
 238         return (auth);
 239 }
 240
 241 const struct auth *
 242 auth_new_chap_mutual(struct auth_group *ag, const char *user,
 243     const char *secret, const char *user2, const char *secret2)
 244 {
 245         struct auth *auth;
 246
 247         if (ag->ag_type == AG_TYPE_UNKNOWN)
 248                 ag->ag_type = AG_TYPE_CHAP_MUTUAL;
 249         if (ag->ag_type != AG_TYPE_CHAP_MUTUAL) {
 250                 if (ag->ag_name != NULL)
 251                         log_warnx("cannot mix \"chap-mutual\" authentication "
 252                             "with other types for auth-group \"%s\"",
 253                             ag->ag_name);
 254                 else
 255                         log_warnx("cannot mix \"chap-mutual\" authentication "
 256                             "with other types for target \"%s\"",
 257                             ag->ag_target->t_name);
 258                 return (NULL);
 259         }
 260
 261         auth = auth_new(ag);
 262         auth->a_user = checked_strdup(user);
 263         auth->a_secret = checked_strdup(secret);
 264         auth->a_mutual_user = checked_strdup(user2);
 265         auth->a_mutual_secret = checked_strdup(secret2);
 266
 267         auth_check_secret_length(auth);
 268
 269         return (auth);
 270 }
 271
 272 const struct auth_name *
 273 auth_name_new(struct auth_group *ag, const char *name)
 274 {
 275         struct auth_name *an;
 276
 277         an = calloc(1, sizeof(*an));
 278         if (an == NULL)
 279                 log_err(1, "calloc");
 280         an->an_auth_group = ag;
 281         an->an_initator_name = checked_strdup(name);
 282         TAILQ_INSERT_TAIL(&ag->ag_names, an, an_next);
 283         return (an);
 284 }
 285
 286 static void
 287 auth_name_delete(struct auth_name *an)
 288 {
 289         TAILQ_REMOVE(&an->an_auth_group->ag_names, an, an_next);
 290
 291         free(an->an_initator_name);
 292         free(an);
 293 }
 294
 295 bool
 296 auth_name_defined(const struct auth_group *ag)
 297 {
 298         if (TAILQ_EMPTY(&ag->ag_names))
 299                 return (false);
 300         return (true);
 301 }
 302
 303 const struct auth_name *
 304 auth_name_find(const struct auth_group *ag, const char *name)
 305 {
 306         const struct auth_name *auth_name;
 307
 308         TAILQ_FOREACH(auth_name, &ag->ag_names, an_next) {
 309                 if (strcmp(auth_name->an_initator_name, name) == 0)
 310                         return (auth_name);
 311         }
 312
 313         return (NULL);
 314 }
 315
 316 const struct auth_portal *
 317 auth_portal_new(struct auth_group *ag, const char *portal)
 318 {
 319         struct auth_portal *ap;
 320
 321         ap = calloc(1, sizeof(*ap));
 322         if (ap == NULL)
 323                 log_err(1, "calloc");
 324         ap->ap_auth_group = ag;
 325         ap->ap_initator_portal = checked_strdup(portal);
 326         TAILQ_INSERT_TAIL(&ag->ag_portals, ap, ap_next);
 327         return (ap);
 328 }
 329
 330 static void
 331 auth_portal_delete(struct auth_portal *ap)
 332 {
 333         TAILQ_REMOVE(&ap->ap_auth_group->ag_portals, ap, ap_next);
 334
 335         free(ap->ap_initator_portal);
 336         free(ap);
 337 }
 338
 339 bool
 340 auth_portal_defined(const struct auth_group *ag)
 341 {
 342         if (TAILQ_EMPTY(&ag->ag_portals))
 343                 return (false);
 344         return (true);
 345 }
 346
 347 const struct auth_portal *
 348 auth_portal_find(const struct auth_group *ag, const char *portal)
 349 {
 350         const struct auth_portal *auth_portal;
 351
 352         TAILQ_FOREACH(auth_portal, &ag->ag_portals, ap_next) {
 353                 if (strcmp(auth_portal->ap_initator_portal, portal) == 0)
 354                         return (auth_portal);
 355         }
 356
 357         return (NULL);
 358 }
 359
 360 struct auth_group *
 361 auth_group_new(struct conf *conf, const char *name)
 362 {
 363         struct auth_group *ag;
 364
 365         if (name != NULL) {
 366                 ag = auth_group_find(conf, name);
 367                 if (ag != NULL) {
 368                         log_warnx("duplicated auth-group \"%s\"", name);
 369                         return (NULL);
 370                 }
 371         }
 372
 373         ag = calloc(1, sizeof(*ag));
 374         if (ag == NULL)
 375                 log_err(1, "calloc");
 376         if (name != NULL)
 377                 ag->ag_name = checked_strdup(name);
 378         TAILQ_INIT(&ag->ag_auths);
 379         TAILQ_INIT(&ag->ag_names);
 380         TAILQ_INIT(&ag->ag_portals);
 381         ag->ag_conf = conf;
 382         TAILQ_INSERT_TAIL(&conf->conf_auth_groups, ag, ag_next);
 383
 384         return (ag);
 385 }
 386
 387 void
 388 auth_group_delete(struct auth_group *ag)
 389 {
 390         struct auth *auth, *auth_tmp;
 391         struct auth_name *auth_name, *auth_name_tmp;
 392         struct auth_portal *auth_portal, *auth_portal_tmp;
 393
 394         TAILQ_REMOVE(&ag->ag_conf->conf_auth_groups, ag, ag_next);
 395
 396         TAILQ_FOREACH_SAFE(auth, &ag->ag_auths, a_next, auth_tmp)
 397                 auth_delete(auth);
 398         TAILQ_FOREACH_SAFE(auth_name, &ag->ag_names, an_next, auth_name_tmp)
 399                 auth_name_delete(auth_name);
 400         TAILQ_FOREACH_SAFE(auth_portal, &ag->ag_portals, ap_next,
 401             auth_portal_tmp)
 402                 auth_portal_delete(auth_portal);
 403         free(ag->ag_name);
 404         free(ag);
 405 }
 406
 407 struct auth_group *
 408 auth_group_find(struct conf *conf, const char *name)
 409 {
 410         struct auth_group *ag;
 411
 412         TAILQ_FOREACH(ag, &conf->conf_auth_groups, ag_next) {
 413                 if (ag->ag_name != NULL && strcmp(ag->ag_name, name) == 0)
 414                         return (ag);
 415         }
 416
 417         return (NULL);
 418 }
 419
 420 static int
 421 auth_group_set_type(struct auth_group *ag, int type)
 422 {
 423
 424         if (ag->ag_type == AG_TYPE_UNKNOWN) {
 425                 ag->ag_type = type;
 426                 return (0);
 427         }
 428
 429         if (ag->ag_type == type)
 430                 return (0);
 431
 432         return (1);
 433 }
 434
 435 int
 436 auth_group_set_type_str(struct auth_group *ag, const char *str)
 437 {
 438         int error, type;
 439
 440         if (strcmp(str, "none") == 0) {
 441                 type = AG_TYPE_NO_AUTHENTICATION;
 442         } else if (strcmp(str, "chap") == 0) {
 443                 type = AG_TYPE_CHAP;
 444         } else if (strcmp(str, "chap-mutual") == 0) {
 445                 type = AG_TYPE_CHAP_MUTUAL;
 446         } else {
 447                 if (ag->ag_name != NULL)
 448                         log_warnx("invalid auth-type \"%s\" for auth-group "
 449                             "\"%s\"", str, ag->ag_name);
 450                 else
 451                         log_warnx("invalid auth-type \"%s\" for target "
 452                             "\"%s\"", str, ag->ag_target->t_name);
 453                 return (1);
 454         }
 455
 456         error = auth_group_set_type(ag, type);
 457         if (error != 0) {
 458                 if (ag->ag_name != NULL)
 459                         log_warnx("cannot set auth-type to \"%s\" for "
 460                             "auth-group \"%s\"; already has a different "
 461                             "type", str, ag->ag_name);
 462                 else
 463                         log_warnx("cannot set auth-type to \"%s\" for target "
 464                             "\"%s\"; already has a different type",
 465                             str, ag->ag_target->t_name);
 466                 return (1);
 467         }
 468
 469         return (error);
 470 }
 471
 472 static struct portal *
 473 portal_new(struct portal_group *pg)
 474 {
 475         struct portal *portal;
 476
 477         portal = calloc(1, sizeof(*portal));
 478         if (portal == NULL)
 479                 log_err(1, "calloc");
 480         TAILQ_INIT(&portal->p_targets);
 481         portal->p_portal_group = pg;
 482         TAILQ_INSERT_TAIL(&pg->pg_portals, portal, p_next);
 483         return (portal);
 484 }
 485
 486 static void
 487 portal_delete(struct portal *portal)
 488 {
 489         TAILQ_REMOVE(&portal->p_portal_group->pg_portals, portal, p_next);
 490         freeaddrinfo(portal->p_ai);
 491         free(portal->p_listen);
 492         free(portal);
 493 }
 494
 495 struct portal_group *
 496 portal_group_new(struct conf *conf, const char *name)
 497 {
 498         struct portal_group *pg;
 499
 500         pg = portal_group_find(conf, name);
 501         if (pg != NULL) {
 502                 log_warnx("duplicated portal-group \"%s\"", name);
 503                 return (NULL);
 504         }
 505
 506         pg = calloc(1, sizeof(*pg));
 507         if (pg == NULL)
 508                 log_err(1, "calloc");
 509         pg->pg_name = checked_strdup(name);
 510         TAILQ_INIT(&pg->pg_portals);
 511         pg->pg_conf = conf;
 512         conf->conf_last_portal_group_tag++;
 513         pg->pg_tag = conf->conf_last_portal_group_tag;
 514         TAILQ_INSERT_TAIL(&conf->conf_portal_groups, pg, pg_next);
 515
 516         return (pg);
 517 }
 518
 519 void
 520 portal_group_delete(struct portal_group *pg)
 521 {
 522         struct portal *portal, *tmp;
 523
 524         TAILQ_REMOVE(&pg->pg_conf->conf_portal_groups, pg, pg_next);
 525
 526         TAILQ_FOREACH_SAFE(portal, &pg->pg_portals, p_next, tmp)
 527                 portal_delete(portal);
 528         free(pg->pg_name);
 529         free(pg);
 530 }
 531
 532 struct portal_group *
 533 portal_group_find(struct conf *conf, const char *name)
 534 {
 535         struct portal_group *pg;
 536
 537         TAILQ_FOREACH(pg, &conf->conf_portal_groups, pg_next) {
 538                 if (strcmp(pg->pg_name, name) == 0)
 539                         return (pg);
 540         }
 541
 542         return (NULL);
 543 }
 544
 545 int
 546 portal_group_add_listen(struct portal_group *pg, const char *value, bool iser)
 547 {
 548         struct addrinfo hints;
 549         struct portal *portal;
 550         char *addr, *ch, *arg;
 551         const char *port;
 552         int error, colons = 0;
 553
 554 #ifndef ICL_KERNEL_PROXY
 555         if (iser) {
 556                 log_warnx("ctld(8) compiled without ICL_KERNEL_PROXY "
 557                     "does not support iSER protocol");
 558                 return (-1);
 559         }
 560 #endif
 561
 562         portal = portal_new(pg);
 563         portal->p_listen = checked_strdup(value);
 564         portal->p_iser = iser;
 565
 566         arg = portal->p_listen;
 567         if (arg[0] == '\0') {
 568                 log_warnx("empty listen address");
 569                 free(portal->p_listen);
 570                 free(portal);
 571                 return (1);
 572         }
 573         if (arg[0] == '[') {
 574                 /*
 575                  * IPv6 address in square brackets, perhaps with port.
 576                  */
 577                 arg++;
 578                 addr = strsep(&arg, "]");
 579                 if (arg == NULL) {
 580                         log_warnx("invalid listen address %s",
 581                             portal->p_listen);
 582                         free(portal->p_listen);
 583                         free(portal);
 584                         return (1);
 585                 }
 586                 if (arg[0] == '\0') {
 587                         port = "3260";
 588                 } else if (arg[0] == ':') {
 589                         port = arg + 1;
 590                 } else {
 591                         log_warnx("invalid listen address %s",
 592                             portal->p_listen);
 593                         free(portal->p_listen);
 594                         free(portal);
 595                         return (1);
 596                 }
 597         } else {
 598                 /*
 599                  * Either IPv6 address without brackets - and without
 600                  * a port - or IPv4 address.  Just count the colons.
 601                  */
 602                 for (ch = arg; *ch != '\0'; ch++) {
 603                         if (*ch == ':')
 604                                 colons++;
 605                 }
 606                 if (colons > 1) {
 607                         addr = arg;
 608                         port = "3260";
 609                 } else {
 610                         addr = strsep(&arg, ":");
 611                         if (arg == NULL)
 612                                 port = "3260";
 613                         else
 614                                 port = arg;
 615                 }
 616         }
 617
 618         memset(&hints, 0, sizeof(hints));
 619         hints.ai_family = PF_UNSPEC;
 620         hints.ai_socktype = SOCK_STREAM;
 621         hints.ai_flags = AI_PASSIVE;
 622
 623         error = getaddrinfo(addr, port, &hints, &portal->p_ai);
 624         if (error != 0) {
 625                 log_warnx("getaddrinfo for %s failed: %s",
 626                     portal->p_listen, gai_strerror(error));
 627                 free(portal->p_listen);
 628                 free(portal);
 629                 return (1);
 630         }
 631
 632         /*
 633          * XXX: getaddrinfo(3) may return multiple addresses; we should turn
 634          *      those into multiple portals.
 635          */
 636
 637         return (0);
 638 }
 639
 640 static bool
 641 valid_hex(const char ch)
 642 {
 643         switch (ch) {
 644         case '0':
 645         case '1':
 646         case '2':
 647         case '3':
 648         case '4':
 649         case '5':
 650         case '6':
 651         case '7':
 652         case '8':
 653         case '9':
 654         case 'a':
 655         case 'A':
 656         case 'b':
 657         case 'B':
 658         case 'c':
 659         case 'C':
 660         case 'd':
 661         case 'D':
 662         case 'e':
 663         case 'E':
 664         case 'f':
 665         case 'F':
 666                 return (true);
 667         default:
 668                 return (false);
 669         }
 670 }
 671
 672 bool
 673 valid_iscsi_name(const char *name)
 674 {
 675         int i;
 676
 677         if (strlen(name) >= MAX_NAME_LEN) {
 678                 log_warnx("overlong name for target \"%s\"; max length allowed "
 679                     "by iSCSI specification is %d characters",
 680                     name, MAX_NAME_LEN);
 681                 return (false);
 682         }
 683
 684         /*
 685          * In the cases below, we don't return an error, just in case the admin
 686          * was right, and we're wrong.
 687          */
 688         if (strncasecmp(name, "iqn.", strlen("iqn.")) == 0) {
 689                 for (i = strlen("iqn."); name[i] != '\0'; i++) {
 690                         /*
 691                          * XXX: We should verify UTF-8 normalisation, as defined
 692                          *      by 3.2.6.2: iSCSI Name Encoding.
 693                          */
 694                         if (isalnum(name[i]))
 695                                 continue;
 696                         if (name[i] == '-' || name[i] == '.' || name[i] == ':')
 697                                 continue;
 698                         log_warnx("invalid character \"%c\" in target name "
 699                             "\"%s\"; allowed characters are letters, digits, "
 700                             "'-', '.', and ':'", name[i], name);
 701                         break;
 702                 }
 703                 /*
 704                  * XXX: Check more stuff: valid date and a valid reversed domain.
 705                  */
 706         } else if (strncasecmp(name, "eui.", strlen("eui.")) == 0) {
 707                 if (strlen(name) != strlen("eui.") + 16)
 708                         log_warnx("invalid target name \"%s\"; the \"eui.\" "
 709                             "should be followed by exactly 16 hexadecimal "
 710                             "digits", name);
 711                 for (i = strlen("eui."); name[i] != '\0'; i++) {
 712                         if (!valid_hex(name[i])) {
 713                                 log_warnx("invalid character \"%c\" in target "
 714                                     "name \"%s\"; allowed characters are 1-9 "
 715                                     "and A-F", name[i], name);
 716                                 break;
 717                         }
 718                 }
 719         } else if (strncasecmp(name, "naa.", strlen("naa.")) == 0) {
 720                 if (strlen(name) > strlen("naa.") + 32)
 721                         log_warnx("invalid target name \"%s\"; the \"naa.\" "
 722                             "should be followed by at most 32 hexadecimal "
 723                             "digits", name);
 724                 for (i = strlen("naa."); name[i] != '\0'; i++) {
 725                         if (!valid_hex(name[i])) {
 726                                 log_warnx("invalid character \"%c\" in target "
 727                                     "name \"%s\"; allowed characters are 1-9 "
 728                                     "and A-F", name[i], name);
 729                                 break;
 730                         }
 731                 }
 732         } else {
 733                 log_warnx("invalid target name \"%s\"; should start with "
 734                     "either \".iqn\", \"eui.\", or \"naa.\"",
 735                     name);
 736         }
 737         return (true);
 738 }
 739
 740 struct target *
 741 target_new(struct conf *conf, const char *name)
 742 {
 743         struct target *targ;
 744         int i, len;
 745
 746         targ = target_find(conf, name);
 747         if (targ != NULL) {
 748                 log_warnx("duplicated target \"%s\"", name);
 749                 return (NULL);
 750         }
 751         if (valid_iscsi_name(name) == false) {
 752                 log_warnx("target name \"%s\" is invalid", name);
 753                 return (NULL);
 754         }
 755         targ = calloc(1, sizeof(*targ));
 756         if (targ == NULL)
 757                 log_err(1, "calloc");
 758         targ->t_name = checked_strdup(name);
 759
 760         /*
 761          * RFC 3722 requires us to normalize the name to lowercase.
 762          */
 763         len = strlen(name);
 764         for (i = 0; i < len; i++)
 765                 targ->t_name[i] = tolower(targ->t_name[i]);
 766
 767         TAILQ_INIT(&targ->t_luns);
 768         targ->t_conf = conf;
 769         TAILQ_INSERT_TAIL(&conf->conf_targets, targ, t_next);
 770
 771         return (targ);
 772 }
 773
 774 void
 775 target_delete(struct target *targ)
 776 {
 777         struct lun *lun, *tmp;
 778
 779         TAILQ_REMOVE(&targ->t_conf->conf_targets, targ, t_next);
 780
 781         TAILQ_FOREACH_SAFE(lun, &targ->t_luns, l_next, tmp)
 782                 lun_delete(lun);
 783         free(targ->t_name);
 784         free(targ);
 785 }
 786
 787 struct target *
 788 target_find(struct conf *conf, const char *name)
 789 {
 790         struct target *targ;
 791
 792         TAILQ_FOREACH(targ, &conf->conf_targets, t_next) {
 793                 if (strcasecmp(targ->t_name, name) == 0)
 794                         return (targ);
 795         }
 796
 797         return (NULL);
 798 }
 799
 800 struct lun *
 801 lun_new(struct target *targ, int lun_id)
 802 {
 803         struct lun *lun;
 804
 805         lun = lun_find(targ, lun_id);
 806         if (lun != NULL) {
 807                 log_warnx("duplicated lun %d for target \"%s\"",
 808                     lun_id, targ->t_name);
 809                 return (NULL);
 810         }
 811
 812         lun = calloc(1, sizeof(*lun));
 813         if (lun == NULL)
 814                 log_err(1, "calloc");
 815         lun->l_lun = lun_id;
 816         TAILQ_INIT(&lun->l_options);
 817         lun->l_target = targ;
 818         TAILQ_INSERT_TAIL(&targ->t_luns, lun, l_next);
 819
 820         return (lun);
 821 }
 822
 823 void
 824 lun_delete(struct lun *lun)
 825 {
 826         struct lun_option *lo, *tmp;
 827
 828         TAILQ_REMOVE(&lun->l_target->t_luns, lun, l_next);
 829
 830         TAILQ_FOREACH_SAFE(lo, &lun->l_options, lo_next, tmp)
 831                 lun_option_delete(lo);
 832         free(lun->l_backend);
 833         free(lun->l_device_id);
 834         free(lun->l_path);
 835         free(lun->l_serial);
 836         free(lun);
 837 }
 838
 839 struct lun *
 840 lun_find(struct target *targ, int lun_id)
 841 {
 842         struct lun *lun;
 843
 844         TAILQ_FOREACH(lun, &targ->t_luns, l_next) {
 845                 if (lun->l_lun == lun_id)
 846                         return (lun);
 847         }
 848
 849         return (NULL);
 850 }
 851
 852 void
 853 lun_set_backend(struct lun *lun, const char *value)
 854 {
 855         free(lun->l_backend);
 856         lun->l_backend = checked_strdup(value);
 857 }
 858
 859 void
 860 lun_set_blocksize(struct lun *lun, size_t value)
 861 {
 862
 863         lun->l_blocksize = value;
 864 }
 865
 866 void
 867 lun_set_device_id(struct lun *lun, const char *value)
 868 {
 869         free(lun->l_device_id);
 870         lun->l_device_id = checked_strdup(value);
 871 }
 872
 873 void
 874 lun_set_path(struct lun *lun, const char *value)
 875 {
 876         free(lun->l_path);
 877         lun->l_path = checked_strdup(value);
 878 }
 879
 880 void
 881 lun_set_serial(struct lun *lun, const char *value)
 882 {
 883         free(lun->l_serial);
 884         lun->l_serial = checked_strdup(value);
 885 }
 886
 887 void
 888 lun_set_size(struct lun *lun, size_t value)
 889 {
 890
 891         lun->l_size = value;
 892 }
 893
 894 void
 895 lun_set_ctl_lun(struct lun *lun, uint32_t value)
 896 {
 897
 898         lun->l_ctl_lun = value;
 899 }
 900
 901 struct lun_option *
 902 lun_option_new(struct lun *lun, const char *name, const char *value)
 903 {
 904         struct lun_option *lo;
 905
 906         lo = lun_option_find(lun, name);
 907         if (lo != NULL) {
 908                 log_warnx("duplicated lun option %s for lun %d, target \"%s\"",
 909                     name, lun->l_lun, lun->l_target->t_name);
 910                 return (NULL);
 911         }
 912
 913         lo = calloc(1, sizeof(*lo));
 914         if (lo == NULL)
 915                 log_err(1, "calloc");
 916         lo->lo_name = checked_strdup(name);
 917         lo->lo_value = checked_strdup(value);
 918         lo->lo_lun = lun;
 919         TAILQ_INSERT_TAIL(&lun->l_options, lo, lo_next);
 920
 921         return (lo);
 922 }
 923
 924 void
 925 lun_option_delete(struct lun_option *lo)
 926 {
 927
 928         TAILQ_REMOVE(&lo->lo_lun->l_options, lo, lo_next);
 929
 930         free(lo->lo_name);
 931         free(lo->lo_value);
 932         free(lo);
 933 }
 934
 935 struct lun_option *
 936 lun_option_find(struct lun *lun, const char *name)
 937 {
 938         struct lun_option *lo;
 939
 940         TAILQ_FOREACH(lo, &lun->l_options, lo_next) {
 941                 if (strcmp(lo->lo_name, name) == 0)
 942                         return (lo);
 943         }
 944
 945         return (NULL);
 946 }
 947
 948 void
 949 lun_option_set(struct lun_option *lo, const char *value)
 950 {
 951
 952         free(lo->lo_value);
 953         lo->lo_value = checked_strdup(value);
 954 }
 955
 956 static struct connection *
 957 connection_new(struct portal *portal, int fd, const char *host)
 958 {
 959         struct connection *conn;
 960
 961         conn = calloc(1, sizeof(*conn));
 962         if (conn == NULL)
 963                 log_err(1, "calloc");
 964         conn->conn_portal = portal;
 965         conn->conn_socket = fd;
 966         conn->conn_initiator_addr = checked_strdup(host);
 967
 968         /*
 969          * Default values, from RFC 3720, section 12.
 970          */
 971         conn->conn_max_data_segment_length = 8192;
 972         conn->conn_max_burst_length = 262144;
 973         conn->conn_immediate_data = true;
 974
 975         return (conn);
 976 }
 977
 978 #if 0
 979 static void
 980 conf_print(struct conf *conf)
 981 {
 982         struct auth_group *ag;
 983         struct auth *auth;
 984         struct auth_name *auth_name;
 985         struct auth_portal *auth_portal;
 986         struct portal_group *pg;
 987         struct portal *portal;
 988         struct target *targ;
 989         struct lun *lun;
 990         struct lun_option *lo;
 991
 992         TAILQ_FOREACH(ag, &conf->conf_auth_groups, ag_next) {
 993                 fprintf(stderr, "auth-group %s {\n", ag->ag_name);
 994                 TAILQ_FOREACH(auth, &ag->ag_auths, a_next)
 995                         fprintf(stderr, "\t chap-mutual %s %s %s %s\n",
 996                             auth->a_user, auth->a_secret,
 997                             auth->a_mutual_user, auth->a_mutual_secret);
 998                 TAILQ_FOREACH(auth_name, &ag->ag_names, an_next)
 999                         fprintf(stderr, "\t initiator-name %s\n",
1000                             auth_name->an_initator_name);
1001                 TAILQ_FOREACH(auth_portal, &ag->ag_portals, an_next)
1002                         fprintf(stderr, "\t initiator-portal %s\n",
1003                             auth_portal->an_initator_portal);
1004                 fprintf(stderr, "}\n");
1005         }
1006         TAILQ_FOREACH(pg, &conf->conf_portal_groups, pg_next) {
1007                 fprintf(stderr, "portal-group %s {\n", pg->pg_name);
1008                 TAILQ_FOREACH(portal, &pg->pg_portals, p_next)
1009                         fprintf(stderr, "\t listen %s\n", portal->p_listen);
1010                 fprintf(stderr, "}\n");
1011         }
1012         TAILQ_FOREACH(targ, &conf->conf_targets, t_next) {
1013                 fprintf(stderr, "target %s {\n", targ->t_name);
1014                 if (targ->t_alias != NULL)
1015                         fprintf(stderr, "\t alias %s\n", targ->t_alias);
1016                 TAILQ_FOREACH(lun, &targ->t_luns, l_next) {
1017                         fprintf(stderr, "\tlun %d {\n", lun->l_lun);
1018                         fprintf(stderr, "\t\tpath %s\n", lun->l_path);
1019                         TAILQ_FOREACH(lo, &lun->l_options, lo_next)
1020                                 fprintf(stderr, "\t\toption %s %s\n",
1021                                     lo->lo_name, lo->lo_value);
1022                         fprintf(stderr, "\t}\n");
1023                 }
1024                 fprintf(stderr, "}\n");
1025         }
1026 }
1027 #endif
1028
1029 static int
1030 conf_verify_lun(struct lun *lun)
1031 {
1032         const struct lun *lun2;
1033         const struct target *targ2;
1034
1035         if (lun->l_backend == NULL)
1036                 lun_set_backend(lun, "block");
1037         if (strcmp(lun->l_backend, "block") == 0) {
1038                 if (lun->l_path == NULL) {
1039                         log_warnx("missing path for lun %d, target \"%s\"",
1040                             lun->l_lun, lun->l_target->t_name);
1041                         return (1);
1042                 }
1043         } else if (strcmp(lun->l_backend, "ramdisk") == 0) {
1044                 if (lun->l_size == 0) {
1045                         log_warnx("missing size for ramdisk-backed lun %d, "
1046                             "target \"%s\"", lun->l_lun, lun->l_target->t_name);
1047                         return (1);
1048                 }
1049                 if (lun->l_path != NULL) {
1050                         log_warnx("path must not be specified "
1051                             "for ramdisk-backed lun %d, target \"%s\"",
1052                             lun->l_lun, lun->l_target->t_name);
1053                         return (1);
1054                 }
1055         }
1056         if (lun->l_lun < 0 || lun->l_lun > 255) {
1057                 log_warnx("invalid lun number for lun %d, target \"%s\"; "
1058                     "must be between 0 and 255", lun->l_lun,
1059                     lun->l_target->t_name);
1060                 return (1);
1061         }
1062         if (lun->l_blocksize == 0) {
1063                 lun_set_blocksize(lun, DEFAULT_BLOCKSIZE);
1064         } else if (lun->l_blocksize < 0) {
1065                 log_warnx("invalid blocksize for lun %d, target \"%s\"; "
1066                     "must be larger than 0", lun->l_lun, lun->l_target->t_name);
1067                 return (1);
1068         }
1069         if (lun->l_size != 0 && lun->l_size % lun->l_blocksize != 0) {
1070                 log_warnx("invalid size for lun %d, target \"%s\"; "
1071                     "must be multiple of blocksize", lun->l_lun,
1072                     lun->l_target->t_name);
1073                 return (1);
1074         }
1075         TAILQ_FOREACH(targ2, &lun->l_target->t_conf->conf_targets, t_next) {
1076                 TAILQ_FOREACH(lun2, &targ2->t_luns, l_next) {
1077                         if (lun == lun2)
1078                                 continue;
1079                         if (lun->l_path != NULL && lun2->l_path != NULL &&
1080                             strcmp(lun->l_path, lun2->l_path) == 0) {
1081                                 log_debugx("WARNING: path \"%s\" duplicated "
1082                                     "between lun %d, target \"%s\", and "
1083                                     "lun %d, target \"%s\"", lun->l_path,
1084                                     lun->l_lun, lun->l_target->t_name,
1085                                     lun2->l_lun, lun2->l_target->t_name);
1086                         }
1087                 }
1088         }
1089
1090         return (0);
1091 }
1092
1093 int
1094 conf_verify(struct conf *conf)
1095 {
1096         struct auth_group *ag;
1097         struct portal_group *pg;
1098         struct target *targ;
1099         struct lun *lun;
1100         bool found_lun0;
1101         int error;
1102
1103         if (conf->conf_pidfile_path == NULL)
1104                 conf->conf_pidfile_path = checked_strdup(DEFAULT_PIDFILE);
1105
1106         TAILQ_FOREACH(targ, &conf->conf_targets, t_next) {
1107                 if (targ->t_auth_group == NULL) {
1108                         log_warnx("missing authentication for target \"%s\"; "
1109                             "must specify either \"auth-group\", \"chap\", "
1110                             "or \"chap-mutual\"", targ->t_name);
1111                         return (1);
1112                 }
1113                 if (targ->t_portal_group == NULL) {
1114                         targ->t_portal_group = portal_group_find(conf,
1115                             "default");
1116                         assert(targ->t_portal_group != NULL);
1117                 }
1118                 found_lun0 = false;
1119                 TAILQ_FOREACH(lun, &targ->t_luns, l_next) {
1120                         error = conf_verify_lun(lun);
1121                         if (error != 0)
1122                                 return (error);
1123                         if (lun->l_lun == 0)
1124                                 found_lun0 = true;
1125                 }
1126                 if (!found_lun0) {
1127                         log_warnx("mandatory LUN 0 not configured "
1128                             "for target \"%s\"", targ->t_name);
1129                         return (1);
1130                 }
1131         }
1132         TAILQ_FOREACH(pg, &conf->conf_portal_groups, pg_next) {
1133                 assert(pg->pg_name != NULL);
1134                 if (pg->pg_discovery_auth_group == NULL) {
1135                         pg->pg_discovery_auth_group =
1136                             auth_group_find(conf, "no-access");
1137                         assert(pg->pg_discovery_auth_group != NULL);
1138                 }
1139
1140                 TAILQ_FOREACH(targ, &conf->conf_targets, t_next) {
1141                         if (targ->t_portal_group == pg)
1142                                 break;
1143                 }
1144                 if (targ == NULL) {
1145                         if (strcmp(pg->pg_name, "default") != 0)
1146                                 log_warnx("portal-group \"%s\" not assigned "
1147                                     "to any target", pg->pg_name);
1148                         pg->pg_unassigned = true;
1149                 } else
1150                         pg->pg_unassigned = false;
1151         }
1152         TAILQ_FOREACH(ag, &conf->conf_auth_groups, ag_next) {
1153                 if (ag->ag_name == NULL)
1154                         assert(ag->ag_target != NULL);
1155                 else
1156                         assert(ag->ag_target == NULL);
1157
1158                 TAILQ_FOREACH(targ, &conf->conf_targets, t_next) {
1159                         if (targ->t_auth_group == ag)
1160                                 break;
1161                 }
1162                 if (targ == NULL && ag->ag_name != NULL &&
1163                     strcmp(ag->ag_name, "no-authentication") != 0 &&
1164                     strcmp(ag->ag_name, "no-access") != 0) {
1165                         log_warnx("auth-group \"%s\" not assigned "
1166                             "to any target", ag->ag_name);
1167                 }
1168         }
1169
1170         return (0);
1171 }
1172
1173 static int
1174 conf_apply(struct conf *oldconf, struct conf *newconf)
1175 {
1176         struct target *oldtarg, *newtarg, *tmptarg;
1177         struct lun *oldlun, *newlun, *tmplun;
1178         struct portal_group *oldpg, *newpg;
1179         struct portal *oldp, *newp;
1180         pid_t otherpid;
1181         int changed, cumulated_error = 0, error;
1182 #ifndef ICL_KERNEL_PROXY
1183         int one = 1;
1184 #endif
1185
1186         if (oldconf->conf_debug != newconf->conf_debug) {
1187                 log_debugx("changing debug level to %d", newconf->conf_debug);
1188                 log_init(newconf->conf_debug);
1189         }
1190
1191         if (oldconf->conf_pidfh != NULL) {
1192                 assert(oldconf->conf_pidfile_path != NULL);
1193                 if (newconf->conf_pidfile_path != NULL &&
1194                     strcmp(oldconf->conf_pidfile_path,
1195                     newconf->conf_pidfile_path) == 0) {
1196                         newconf->conf_pidfh = oldconf->conf_pidfh;
1197                         oldconf->conf_pidfh = NULL;
1198                 } else {
1199                         log_debugx("removing pidfile %s",
1200                             oldconf->conf_pidfile_path);
1201                         pidfile_remove(oldconf->conf_pidfh);
1202                         oldconf->conf_pidfh = NULL;
1203                 }
1204         }
1205
1206         if (newconf->conf_pidfh == NULL && newconf->conf_pidfile_path != NULL) {
1207                 log_debugx("opening pidfile %s", newconf->conf_pidfile_path);
1208                 newconf->conf_pidfh =
1209                     pidfile_open(newconf->conf_pidfile_path, 0600, &otherpid);
1210                 if (newconf->conf_pidfh == NULL) {
1211                         if (errno == EEXIST)
1212                                 log_errx(1, "daemon already running, pid: %jd.",
1213                                     (intmax_t)otherpid);
1214                         log_err(1, "cannot open or create pidfile \"%s\"",
1215                             newconf->conf_pidfile_path);
1216                 }
1217         }
1218
1219         TAILQ_FOREACH_SAFE(oldtarg, &oldconf->conf_targets, t_next, tmptarg) {
1220                 /*
1221                  * First, remove any targets present in the old configuration
1222                  * and missing in the new one.
1223                  */
1224                 newtarg = target_find(newconf, oldtarg->t_name);
1225                 if (newtarg == NULL) {
1226                         TAILQ_FOREACH_SAFE(oldlun, &oldtarg->t_luns, l_next,
1227                             tmplun) {
1228                                 log_debugx("target %s not found in new "
1229                                     "configuration; removing its lun %d, "
1230                                     "backed by CTL lun %d",
1231                                     oldtarg->t_name, oldlun->l_lun,
1232                                     oldlun->l_ctl_lun);
1233                                 error = kernel_lun_remove(oldlun);
1234                                 if (error != 0) {
1235                                         log_warnx("failed to remove lun %d, "
1236                                             "target %s, CTL lun %d",
1237                                             oldlun->l_lun, oldtarg->t_name,
1238                                             oldlun->l_ctl_lun);
1239                                         cumulated_error++;
1240                                 }
1241                                 lun_delete(oldlun);
1242                         }
1243                         target_delete(oldtarg);
1244                         continue;
1245                 }
1246
1247                 /*
1248                  * Second, remove any LUNs present in the old target
1249                  * and missing in the new one.
1250                  */
1251                 TAILQ_FOREACH_SAFE(oldlun, &oldtarg->t_luns, l_next, tmplun) {
1252                         newlun = lun_find(newtarg, oldlun->l_lun);
1253                         if (newlun == NULL) {
1254                                 log_debugx("lun %d, target %s, CTL lun %d "
1255                                     "not found in new configuration; "
1256                                     "removing", oldlun->l_lun, oldtarg->t_name,
1257                                     oldlun->l_ctl_lun);
1258                                 error = kernel_lun_remove(oldlun);
1259                                 if (error != 0) {
1260                                         log_warnx("failed to remove lun %d, "
1261                                             "target %s, CTL lun %d",
1262                                             oldlun->l_lun, oldtarg->t_name,
1263                                             oldlun->l_ctl_lun);
1264                                         cumulated_error++;
1265                                 }
1266                                 lun_delete(oldlun);
1267                                 continue;
1268                         }
1269
1270                         /*
1271                          * Also remove the LUNs changed by more than size.
1272                          */
1273                         changed = 0;
1274                         assert(oldlun->l_backend != NULL);
1275                         assert(newlun->l_backend != NULL);
1276                         if (strcmp(newlun->l_backend, oldlun->l_backend) != 0) {
1277                                 log_debugx("backend for lun %d, target %s, "
1278                                     "CTL lun %d changed; removing",
1279                                     oldlun->l_lun, oldtarg->t_name,
1280                                     oldlun->l_ctl_lun);
1281                                 changed = 1;
1282                         }
1283                         if (oldlun->l_blocksize != newlun->l_blocksize) {
1284                                 log_debugx("blocksize for lun %d, target %s, "
1285                                     "CTL lun %d changed; removing",
1286                                     oldlun->l_lun, oldtarg->t_name,
1287                                     oldlun->l_ctl_lun);
1288                                 changed = 1;
1289                         }
1290                         if (newlun->l_device_id != NULL &&
1291                             (oldlun->l_device_id == NULL ||
1292                              strcmp(oldlun->l_device_id, newlun->l_device_id) !=
1293                              0)) {
1294                                 log_debugx("device-id for lun %d, target %s, "
1295                                     "CTL lun %d changed; removing",
1296                                     oldlun->l_lun, oldtarg->t_name,
1297                                     oldlun->l_ctl_lun);
1298                                 changed = 1;
1299                         }
1300                         if (newlun->l_path != NULL &&
1301                             (oldlun->l_path == NULL ||
1302                              strcmp(oldlun->l_path, newlun->l_path) != 0)) {
1303                                 log_debugx("path for lun %d, target %s, "
1304                                     "CTL lun %d, changed; removing",
1305                                     oldlun->l_lun, oldtarg->t_name,
1306                                     oldlun->l_ctl_lun);
1307                                 changed = 1;
1308                         }
1309                         if (newlun->l_serial != NULL &&
1310                             (oldlun->l_serial == NULL ||
1311                              strcmp(oldlun->l_serial, newlun->l_serial) != 0)) {
1312                                 log_debugx("serial for lun %d, target %s, "
1313                                     "CTL lun %d changed; removing",
1314                                     oldlun->l_lun, oldtarg->t_name,
1315                                     oldlun->l_ctl_lun);
1316                                 changed = 1;
1317                         }
1318                         if (changed) {
1319                                 error = kernel_lun_remove(oldlun);
1320                                 if (error != 0) {
1321                                         log_warnx("failed to remove lun %d, "
1322                                             "target %s, CTL lun %d",
1323                                             oldlun->l_lun, oldtarg->t_name,
1324                                             oldlun->l_ctl_lun);
1325                                         cumulated_error++;
1326                                 }
1327                                 lun_delete(oldlun);
1328                                 continue;
1329                         }
1330
1331                         lun_set_ctl_lun(newlun, oldlun->l_ctl_lun);
1332                 }
1333         }
1334
1335         /*
1336          * Now add new targets or modify existing ones.
1337          */
1338         TAILQ_FOREACH(newtarg, &newconf->conf_targets, t_next) {
1339                 oldtarg = target_find(oldconf, newtarg->t_name);
1340
1341                 TAILQ_FOREACH(newlun, &newtarg->t_luns, l_next) {
1342                         if (oldtarg != NULL) {
1343                                 oldlun = lun_find(oldtarg, newlun->l_lun);
1344                                 if (oldlun != NULL) {
1345                                         if (newlun->l_size != oldlun->l_size) {
1346                                                 log_debugx("resizing lun %d, "
1347                                                     "target %s, CTL lun %d",
1348                                                     newlun->l_lun,
1349                                                     newtarg->t_name,
1350                                                     newlun->l_ctl_lun);
1351                                                 error =
1352                                                     kernel_lun_resize(newlun);
1353                                                 if (error != 0) {
1354                                                         log_warnx("failed to "
1355                                                             "resize lun %d, "
1356                                                             "target %s, "
1357                                                             "CTL lun %d",
1358                                                             newlun->l_lun,
1359                                                             newtarg->t_name,
1360                                                             newlun->l_lun);
1361                                                         cumulated_error++;
1362                                                 }
1363                                         }
1364                                         continue;
1365                                 }
1366                         }
1367                         log_debugx("adding lun %d, target %s",
1368                             newlun->l_lun, newtarg->t_name);
1369                         error = kernel_lun_add(newlun);
1370                         if (error != 0) {
1371                                 log_warnx("failed to add lun %d, target %s",
1372                                     newlun->l_lun, newtarg->t_name);
1373                                 cumulated_error++;
1374                         }
1375                 }
1376         }
1377
1378         /*
1379          * Go through the new portals, opening the sockets as neccessary.
1380          */
1381         TAILQ_FOREACH(newpg, &newconf->conf_portal_groups, pg_next) {
1382                 if (newpg->pg_unassigned) {
1383                         log_debugx("not listening on portal-group \"%s\", "
1384                             "not assigned to any target",
1385                             newpg->pg_name);
1386                         continue;
1387                 }
1388                 TAILQ_FOREACH(newp, &newpg->pg_portals, p_next) {
1389                         /*
1390                          * Try to find already open portal and reuse
1391                          * the listening socket.  We don't care about
1392                          * what portal or portal group that was, what
1393                          * matters is the listening address.
1394                          */
1395                         TAILQ_FOREACH(oldpg, &oldconf->conf_portal_groups,
1396                             pg_next) {
1397                                 TAILQ_FOREACH(oldp, &oldpg->pg_portals,
1398                                     p_next) {
1399                                         if (strcmp(newp->p_listen,
1400                                             oldp->p_listen) == 0 &&
1401                                             oldp->p_socket > 0) {
1402                                                 newp->p_socket =
1403                                                     oldp->p_socket;
1404                                                 oldp->p_socket = 0;
1405                                                 break;
1406                                         }
1407                                 }
1408                         }
1409                         if (newp->p_socket > 0) {
1410                                 /*
1411                                  * We're done with this portal.
1412                                  */
1413                                 continue;
1414                         }
1415
1416 #ifdef ICL_KERNEL_PROXY
1417                         log_debugx("listening on %s, portal-group \"%s\" using ICL proxy",
1418                             newp->p_listen, newpg->pg_name);
1419                         kernel_listen(newp->p_ai, newp->p_iser);
1420 #else
1421                         assert(newp->p_iser == false);
1422
1423                         log_debugx("listening on %s, portal-group \"%s\"",
1424                             newp->p_listen, newpg->pg_name);
1425                         newp->p_socket = socket(newp->p_ai->ai_family,
1426                             newp->p_ai->ai_socktype,
1427                             newp->p_ai->ai_protocol);
1428                         if (newp->p_socket < 0) {
1429                                 log_warn("socket(2) failed for %s",
1430                                     newp->p_listen);
1431                                 cumulated_error++;
1432                                 continue;
1433                         }
1434                         error = setsockopt(newp->p_socket, SOL_SOCKET,
1435                             SO_REUSEADDR, &one, sizeof(one));
1436                         if (error != 0) {
1437                                 log_warn("setsockopt(SO_REUSEADDR) failed "
1438                                     "for %s", newp->p_listen);
1439                                 close(newp->p_socket);
1440                                 newp->p_socket = 0;
1441                                 cumulated_error++;
1442                                 continue;
1443                         }
1444                         error = bind(newp->p_socket, newp->p_ai->ai_addr,
1445                             newp->p_ai->ai_addrlen);
1446                         if (error != 0) {
1447                                 log_warn("bind(2) failed for %s",
1448                                     newp->p_listen);
1449                                 close(newp->p_socket);
1450                                 newp->p_socket = 0;
1451                                 cumulated_error++;
1452                                 continue;
1453                         }
1454                         error = listen(newp->p_socket, -1);
1455                         if (error != 0) {
1456                                 log_warn("listen(2) failed for %s",
1457                                     newp->p_listen);
1458                                 close(newp->p_socket);
1459                                 newp->p_socket = 0;
1460                                 cumulated_error++;
1461                                 continue;
1462                         }
1463 #endif /* !ICL_KERNEL_PROXY */
1464                 }
1465         }
1466
1467         /*
1468          * Go through the no longer used sockets, closing them.
1469          */
1470         TAILQ_FOREACH(oldpg, &oldconf->conf_portal_groups, pg_next) {
1471                 TAILQ_FOREACH(oldp, &oldpg->pg_portals, p_next) {
1472                         if (oldp->p_socket <= 0)
1473                                 continue;
1474                         log_debugx("closing socket for %s, portal-group \"%s\"",
1475                             oldp->p_listen, oldpg->pg_name);
1476                         close(oldp->p_socket);
1477                         oldp->p_socket = 0;
1478                 }
1479         }
1480
1481         return (cumulated_error);
1482 }
1483
1484 bool
1485 timed_out(void)
1486 {
1487
1488         return (sigalrm_received);
1489 }
1490
1491 static void
1492 sigalrm_handler(int dummy __unused)
1493 {
1494         /*
1495          * It would be easiest to just log an error and exit.  We can't
1496          * do this, though, because log_errx() is not signal safe, since
1497          * it calls syslog(3).  Instead, set a flag checked by pdu_send()
1498          * and pdu_receive(), to call log_errx() there.  Should they fail
1499          * to notice, we'll exit here one second later.
1500          */
1501         if (sigalrm_received) {
1502                 /*
1503                  * Oh well.  Just give up and quit.
1504                  */
1505                 _exit(2);
1506         }
1507
1508         sigalrm_received = true;
1509 }
1510
1511 static void
1512 set_timeout(const struct conf *conf)
1513 {
1514         struct sigaction sa;
1515         struct itimerval itv;
1516         int error;
1517
1518         if (conf->conf_timeout <= 0) {
1519                 log_debugx("session timeout disabled");
1520                 return;
1521         }
1522
1523         bzero(&sa, sizeof(sa));
1524         sa.sa_handler = sigalrm_handler;
1525         sigfillset(&sa.sa_mask);
1526         error = sigaction(SIGALRM, &sa, NULL);
1527         if (error != 0)
1528                 log_err(1, "sigaction");
1529
1530         /*
1531          * First SIGALRM will arive after conf_timeout seconds.
1532          * If we do nothing, another one will arrive a second later.
1533          */
1534         bzero(&itv, sizeof(itv));
1535         itv.it_interval.tv_sec = 1;
1536         itv.it_value.tv_sec = conf->conf_timeout;
1537
1538         log_debugx("setting session timeout to %d seconds",
1539             conf->conf_timeout);
1540         error = setitimer(ITIMER_REAL, &itv, NULL);
1541         if (error != 0)
1542                 log_err(1, "setitimer");
1543 }
1544
1545 static int
1546 wait_for_children(bool block)
1547 {
1548         pid_t pid;
1549         int status;
1550         int num = 0;
1551
1552         for (;;) {
1553                 /*
1554                  * If "block" is true, wait for at least one process.
1555                  */
1556                 if (block && num == 0)
1557                         pid = wait4(-1, &status, 0, NULL);
1558                 else
1559                         pid = wait4(-1, &status, WNOHANG, NULL);
1560                 if (pid <= 0)
1561                         break;
1562                 if (WIFSIGNALED(status)) {
1563                         log_warnx("child process %d terminated with signal %d",
1564                             pid, WTERMSIG(status));
1565                 } else if (WEXITSTATUS(status) != 0) {
1566                         log_warnx("child process %d terminated with exit status %d",
1567                             pid, WEXITSTATUS(status));
1568                 } else {
1569                         log_debugx("child process %d terminated gracefully", pid);
1570                 }
1571                 num++;
1572         }
1573
1574         return (num);
1575 }
1576
1577 static void
1578 handle_connection(struct portal *portal, int fd, bool dont_fork)
1579 {
1580         struct connection *conn;
1581 #ifndef ICL_KERNEL_PROXY
1582         struct sockaddr_storage ss;
1583         socklen_t sslen = sizeof(ss);
1584         int error;
1585 #endif
1586         pid_t pid;
1587         char host[NI_MAXHOST + 1];
1588         struct conf *conf;
1589
1590         conf = portal->p_portal_group->pg_conf;
1591
1592         if (dont_fork) {
1593                 log_debugx("incoming connection; not forking due to -d flag");
1594         } else {
1595                 nchildren -= wait_for_children(false);
1596                 assert(nchildren >= 0);
1597
1598                 while (conf->conf_maxproc > 0 && nchildren >= conf->conf_maxproc) {
1599                         log_debugx("maxproc limit of %d child processes hit; "
1600                             "waiting for child process to exit", conf->conf_maxproc);
1601                         nchildren -= wait_for_children(true);
1602                         assert(nchildren >= 0);
1603                 }
1604                 log_debugx("incoming connection; forking child process #%d",
1605                     nchildren);
1606                 nchildren++;
1607                 pid = fork();
1608                 if (pid < 0)
1609                         log_err(1, "fork");
1610                 if (pid > 0) {
1611                         close(fd);
1612                         return;
1613                 }
1614         }
1615         pidfile_close(conf->conf_pidfh);
1616
1617 #ifdef ICL_KERNEL_PROXY
1618         /*
1619          * XXX
1620          */
1621         log_set_peer_addr("XXX");
1622 #else
1623         error = getpeername(fd, (struct sockaddr *)&ss, &sslen);
1624         if (error != 0)
1625                 log_err(1, "getpeername");
1626         error = getnameinfo((struct sockaddr *)&ss, sslen,
1627             host, sizeof(host), NULL, 0, NI_NUMERICHOST);
1628         if (error != 0)
1629                 log_errx(1, "getaddrinfo: %s", gai_strerror(error));
1630
1631         log_debugx("accepted connection from %s; portal group \"%s\"",
1632             host, portal->p_portal_group->pg_name);
1633         log_set_peer_addr(host);
1634         setproctitle("%s", host);
1635 #endif
1636
1637         conn = connection_new(portal, fd, host);
1638         set_timeout(conf);
1639         kernel_capsicate();
1640         login(conn);
1641         if (conn->conn_session_type == CONN_SESSION_TYPE_NORMAL) {
1642                 kernel_handoff(conn);
1643                 log_debugx("connection handed off to the kernel");
1644         } else {
1645                 assert(conn->conn_session_type == CONN_SESSION_TYPE_DISCOVERY);
1646                 discovery(conn);
1647         }
1648         log_debugx("nothing more to do; exiting");
1649         exit(0);
1650 }
1651
1652 #ifndef ICL_KERNEL_PROXY
1653 static int
1654 fd_add(int fd, fd_set *fdset, int nfds)
1655 {
1656
1657         /*
1658          * Skip sockets which we failed to bind.
1659          */
1660         if (fd <= 0)
1661                 return (nfds);
1662
1663         FD_SET(fd, fdset);
1664         if (fd > nfds)
1665                 nfds = fd;
1666         return (nfds);
1667 }
1668 #endif
1669
1670 static void
1671 main_loop(struct conf *conf, bool dont_fork)
1672 {
1673         struct portal_group *pg;
1674         struct portal *portal;
1675 #ifdef ICL_KERNEL_PROXY
1676         int connection_id;
1677 #else
1678         fd_set fdset;
1679         int error, nfds, client_fd;
1680 #endif
1681
1682         pidfile_write(conf->conf_pidfh);
1683
1684         for (;;) {
1685                 if (sighup_received || sigterm_received)
1686                         return;
1687
1688 #ifdef ICL_KERNEL_PROXY
1689                 connection_id = kernel_accept();
1690                 if (connection_id == 0)
1691                         continue;
1692
1693                 /*
1694                  * XXX: This is obviously temporary.
1695                  */
1696                 pg = TAILQ_FIRST(&conf->conf_portal_groups);
1697                 portal = TAILQ_FIRST(&pg->pg_portals);
1698
1699                 handle_connection(portal, connection_id, dont_fork);
1700 #else
1701                 FD_ZERO(&fdset);
1702                 nfds = 0;
1703                 TAILQ_FOREACH(pg, &conf->conf_portal_groups, pg_next) {
1704                         TAILQ_FOREACH(portal, &pg->pg_portals, p_next)
1705                                 nfds = fd_add(portal->p_socket, &fdset, nfds);
1706                 }
1707                 error = select(nfds + 1, &fdset, NULL, NULL, NULL);
1708                 if (error <= 0) {
1709                         if (errno == EINTR)
1710                                 return;
1711                         log_err(1, "select");
1712                 }
1713                 TAILQ_FOREACH(pg, &conf->conf_portal_groups, pg_next) {
1714                         TAILQ_FOREACH(portal, &pg->pg_portals, p_next) {
1715                                 if (!FD_ISSET(portal->p_socket, &fdset))
1716                                         continue;
1717                                 client_fd = accept(portal->p_socket, NULL, 0);
1718                                 if (client_fd < 0)
1719                                         log_err(1, "accept");
1720                                 handle_connection(portal, client_fd, dont_fork);
1721                                 break;
1722                         }
1723                 }
1724 #endif /* !ICL_KERNEL_PROXY */
1725         }
1726 }
1727
1728 static void
1729 sighup_handler(int dummy __unused)
1730 {
1731
1732         sighup_received = true;
1733 }
1734
1735 static void
1736 sigterm_handler(int dummy __unused)
1737 {
1738
1739         sigterm_received = true;
1740 }
1741
1742 static void
1743 register_signals(void)
1744 {
1745         struct sigaction sa;
1746         int error;
1747
1748         bzero(&sa, sizeof(sa));
1749         sa.sa_handler = sighup_handler;
1750         sigfillset(&sa.sa_mask);
1751         error = sigaction(SIGHUP, &sa, NULL);
1752         if (error != 0)
1753                 log_err(1, "sigaction");
1754
1755         sa.sa_handler = sigterm_handler;
1756         error = sigaction(SIGTERM, &sa, NULL);
1757         if (error != 0)
1758                 log_err(1, "sigaction");
1759
1760         sa.sa_handler = sigterm_handler;
1761         error = sigaction(SIGINT, &sa, NULL);
1762         if (error != 0)
1763                 log_err(1, "sigaction");
1764 }
1765
1766 int
1767 main(int argc, char **argv)
1768 {
1769         struct conf *oldconf, *newconf, *tmpconf;
1770         const char *config_path = DEFAULT_CONFIG_PATH;
1771         int debug = 0, ch, error;
1772         bool dont_daemonize = false;
1773
1774         while ((ch = getopt(argc, argv, "df:")) != -1) {
1775                 switch (ch) {
1776                 case 'd':
1777                         dont_daemonize = true;
1778                         debug++;
1779                         break;
1780                 case 'f':
1781                         config_path = optarg;
1782                         break;
1783                 case '?':
1784                 default:
1785                         usage();
1786                 }
1787         }
1788         argc -= optind;
1789         if (argc != 0)
1790                 usage();
1791
1792         log_init(debug);
1793         kernel_init();
1794
1795         oldconf = conf_new_from_kernel();
1796         newconf = conf_new_from_file(config_path);
1797         if (newconf == NULL)
1798                 log_errx(1, "configuration error, exiting");
1799         if (debug > 0) {
1800                 oldconf->conf_debug = debug;
1801                 newconf->conf_debug = debug;
1802         }
1803
1804 #ifdef ICL_KERNEL_PROXY
1805         log_debugx("enabling CTL iSCSI port");
1806         error = kernel_port_on();
1807         if (error != 0)
1808                 log_errx(1, "failed to enable CTL iSCSI port, exiting");
1809 #endif
1810
1811         error = conf_apply(oldconf, newconf);
1812         if (error != 0)
1813                 log_errx(1, "failed to apply configuration, exiting");
1814         conf_delete(oldconf);
1815         oldconf = NULL;
1816
1817         register_signals();
1818
1819 #ifndef ICL_KERNEL_PROXY
1820         log_debugx("enabling CTL iSCSI port");
1821         error = kernel_port_on();
1822         if (error != 0)
1823                 log_errx(1, "failed to enable CTL iSCSI port, exiting");
1824 #endif
1825
1826         if (dont_daemonize == false) {
1827                 log_debugx("daemonizing");
1828                 if (daemon(0, 0) == -1) {
1829                         log_warn("cannot daemonize");
1830                         pidfile_remove(newconf->conf_pidfh);
1831                         exit(1);
1832                 }
1833         }
1834
1835         for (;;) {
1836                 main_loop(newconf, dont_daemonize);
1837                 if (sighup_received) {
1838                         sighup_received = false;
1839                         log_debugx("received SIGHUP, reloading configuration");
1840                         tmpconf = conf_new_from_file(config_path);
1841                         if (tmpconf == NULL) {
1842                                 log_warnx("configuration error, "
1843                                     "continuing with old configuration");
1844                         } else {
1845                                 if (debug > 0)
1846                                         tmpconf->conf_debug = debug;
1847                                 oldconf = newconf;
1848                                 newconf = tmpconf;
1849                                 error = conf_apply(oldconf, newconf);
1850                                 if (error != 0)
1851                                         log_warnx("failed to reload "
1852                                             "configuration");
1853                                 conf_delete(oldconf);
1854                                 oldconf = NULL;
1855                         }
1856                 } else if (sigterm_received) {
1857                         log_debugx("exiting on signal; "
1858                             "reloading empty configuration");
1859
1860                         log_debugx("disabling CTL iSCSI port "
1861                             "and terminating all connections");
1862                         error = kernel_port_off();
1863                         if (error != 0)
1864                                 log_warnx("failed to disable CTL iSCSI port");
1865
1866                         oldconf = newconf;
1867                         newconf = conf_new();
1868                         if (debug > 0)
1869                                 newconf->conf_debug = debug;
1870                         error = conf_apply(oldconf, newconf);
1871                         if (error != 0)
1872                                 log_warnx("failed to apply configuration");
1873
1874                         log_warnx("exiting on signal");
1875                         exit(0);
1876                 } else {
1877                         nchildren -= wait_for_children(false);
1878                         assert(nchildren >= 0);
1879                 }
1880         }
1881         /* NOTREACHED */
1882 }