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, "deny") == 0) {
 443                 type = AG_TYPE_DENY;
 444         } else if (strcmp(str, "chap") == 0) {
 445                 type = AG_TYPE_CHAP;
 446         } else if (strcmp(str, "chap-mutual") == 0) {
 447                 type = AG_TYPE_CHAP_MUTUAL;
 448         } else {
 449                 if (ag->ag_name != NULL)
 450                         log_warnx("invalid auth-type \"%s\" for auth-group "
 451                             "\"%s\"", str, ag->ag_name);
 452                 else
 453                         log_warnx("invalid auth-type \"%s\" for target "
 454                             "\"%s\"", str, ag->ag_target->t_name);
 455                 return (1);
 456         }
 457
 458         error = auth_group_set_type(ag, type);
 459         if (error != 0) {
 460                 if (ag->ag_name != NULL)
 461                         log_warnx("cannot set auth-type to \"%s\" for "
 462                             "auth-group \"%s\"; already has a different "
 463                             "type", str, ag->ag_name);
 464                 else
 465                         log_warnx("cannot set auth-type to \"%s\" for target "
 466                             "\"%s\"; already has a different type",
 467                             str, ag->ag_target->t_name);
 468                 return (1);
 469         }
 470
 471         return (error);
 472 }
 473
 474 static struct portal *
 475 portal_new(struct portal_group *pg)
 476 {
 477         struct portal *portal;
 478
 479         portal = calloc(1, sizeof(*portal));
 480         if (portal == NULL)
 481                 log_err(1, "calloc");
 482         TAILQ_INIT(&portal->p_targets);
 483         portal->p_portal_group = pg;
 484         TAILQ_INSERT_TAIL(&pg->pg_portals, portal, p_next);
 485         return (portal);
 486 }
 487
 488 static void
 489 portal_delete(struct portal *portal)
 490 {
 491         TAILQ_REMOVE(&portal->p_portal_group->pg_portals, portal, p_next);
 492         freeaddrinfo(portal->p_ai);
 493         free(portal->p_listen);
 494         free(portal);
 495 }
 496
 497 struct portal_group *
 498 portal_group_new(struct conf *conf, const char *name)
 499 {
 500         struct portal_group *pg;
 501
 502         pg = portal_group_find(conf, name);
 503         if (pg != NULL) {
 504                 log_warnx("duplicated portal-group \"%s\"", name);
 505                 return (NULL);
 506         }
 507
 508         pg = calloc(1, sizeof(*pg));
 509         if (pg == NULL)
 510                 log_err(1, "calloc");
 511         pg->pg_name = checked_strdup(name);
 512         TAILQ_INIT(&pg->pg_portals);
 513         pg->pg_conf = conf;
 514         conf->conf_last_portal_group_tag++;
 515         pg->pg_tag = conf->conf_last_portal_group_tag;
 516         TAILQ_INSERT_TAIL(&conf->conf_portal_groups, pg, pg_next);
 517
 518         return (pg);
 519 }
 520
 521 void
 522 portal_group_delete(struct portal_group *pg)
 523 {
 524         struct portal *portal, *tmp;
 525
 526         TAILQ_REMOVE(&pg->pg_conf->conf_portal_groups, pg, pg_next);
 527
 528         TAILQ_FOREACH_SAFE(portal, &pg->pg_portals, p_next, tmp)
 529                 portal_delete(portal);
 530         free(pg->pg_name);
 531         free(pg);
 532 }
 533
 534 struct portal_group *
 535 portal_group_find(struct conf *conf, const char *name)
 536 {
 537         struct portal_group *pg;
 538
 539         TAILQ_FOREACH(pg, &conf->conf_portal_groups, pg_next) {
 540                 if (strcmp(pg->pg_name, name) == 0)
 541                         return (pg);
 542         }
 543
 544         return (NULL);
 545 }
 546
 547 int
 548 portal_group_add_listen(struct portal_group *pg, const char *value, bool iser)
 549 {
 550         struct addrinfo hints;
 551         struct portal *portal;
 552         char *addr, *ch, *arg;
 553         const char *port;
 554         int error, colons = 0;
 555
 556 #ifndef ICL_KERNEL_PROXY
 557         if (iser) {
 558                 log_warnx("ctld(8) compiled without ICL_KERNEL_PROXY "
 559                     "does not support iSER protocol");
 560                 return (-1);
 561         }
 562 #endif
 563
 564         portal = portal_new(pg);
 565         portal->p_listen = checked_strdup(value);
 566         portal->p_iser = iser;
 567
 568         arg = portal->p_listen;
 569         if (arg[0] == '\0') {
 570                 log_warnx("empty listen address");
 571                 free(portal->p_listen);
 572                 free(portal);
 573                 return (1);
 574         }
 575         if (arg[0] == '[') {
 576                 /*
 577                  * IPv6 address in square brackets, perhaps with port.
 578                  */
 579                 arg++;
 580                 addr = strsep(&arg, "]");
 581                 if (arg == NULL) {
 582                         log_warnx("invalid listen address %s",
 583                             portal->p_listen);
 584                         free(portal->p_listen);
 585                         free(portal);
 586                         return (1);
 587                 }
 588                 if (arg[0] == '\0') {
 589                         port = "3260";
 590                 } else if (arg[0] == ':') {
 591                         port = arg + 1;
 592                 } else {
 593                         log_warnx("invalid listen address %s",
 594                             portal->p_listen);
 595                         free(portal->p_listen);
 596                         free(portal);
 597                         return (1);
 598                 }
 599         } else {
 600                 /*
 601                  * Either IPv6 address without brackets - and without
 602                  * a port - or IPv4 address.  Just count the colons.
 603                  */
 604                 for (ch = arg; *ch != '\0'; ch++) {
 605                         if (*ch == ':')
 606                                 colons++;
 607                 }
 608                 if (colons > 1) {
 609                         addr = arg;
 610                         port = "3260";
 611                 } else {
 612                         addr = strsep(&arg, ":");
 613                         if (arg == NULL)
 614                                 port = "3260";
 615                         else
 616                                 port = arg;
 617                 }
 618         }
 619
 620         memset(&hints, 0, sizeof(hints));
 621         hints.ai_family = PF_UNSPEC;
 622         hints.ai_socktype = SOCK_STREAM;
 623         hints.ai_flags = AI_PASSIVE;
 624
 625         error = getaddrinfo(addr, port, &hints, &portal->p_ai);
 626         if (error != 0) {
 627                 log_warnx("getaddrinfo for %s failed: %s",
 628                     portal->p_listen, gai_strerror(error));
 629                 free(portal->p_listen);
 630                 free(portal);
 631                 return (1);
 632         }
 633
 634         /*
 635          * XXX: getaddrinfo(3) may return multiple addresses; we should turn
 636          *      those into multiple portals.
 637          */
 638
 639         return (0);
 640 }
 641
 642 static bool
 643 valid_hex(const char ch)
 644 {
 645         switch (ch) {
 646         case '0':
 647         case '1':
 648         case '2':
 649         case '3':
 650         case '4':
 651         case '5':
 652         case '6':
 653         case '7':
 654         case '8':
 655         case '9':
 656         case 'a':
 657         case 'A':
 658         case 'b':
 659         case 'B':
 660         case 'c':
 661         case 'C':
 662         case 'd':
 663         case 'D':
 664         case 'e':
 665         case 'E':
 666         case 'f':
 667         case 'F':
 668                 return (true);
 669         default:
 670                 return (false);
 671         }
 672 }
 673
 674 bool
 675 valid_iscsi_name(const char *name)
 676 {
 677         int i;
 678
 679         if (strlen(name) >= MAX_NAME_LEN) {
 680                 log_warnx("overlong name for target \"%s\"; max length allowed "
 681                     "by iSCSI specification is %d characters",
 682                     name, MAX_NAME_LEN);
 683                 return (false);
 684         }
 685
 686         /*
 687          * In the cases below, we don't return an error, just in case the admin
 688          * was right, and we're wrong.
 689          */
 690         if (strncasecmp(name, "iqn.", strlen("iqn.")) == 0) {
 691                 for (i = strlen("iqn."); name[i] != '\0'; i++) {
 692                         /*
 693                          * XXX: We should verify UTF-8 normalisation, as defined
 694                          *      by 3.2.6.2: iSCSI Name Encoding.
 695                          */
 696                         if (isalnum(name[i]))
 697                                 continue;
 698                         if (name[i] == '-' || name[i] == '.' || name[i] == ':')
 699                                 continue;
 700                         log_warnx("invalid character \"%c\" in target name "
 701                             "\"%s\"; allowed characters are letters, digits, "
 702                             "'-', '.', and ':'", name[i], name);
 703                         break;
 704                 }
 705                 /*
 706                  * XXX: Check more stuff: valid date and a valid reversed domain.
 707                  */
 708         } else if (strncasecmp(name, "eui.", strlen("eui.")) == 0) {
 709                 if (strlen(name) != strlen("eui.") + 16)
 710                         log_warnx("invalid target name \"%s\"; the \"eui.\" "
 711                             "should be followed by exactly 16 hexadecimal "
 712                             "digits", name);
 713                 for (i = strlen("eui."); name[i] != '\0'; i++) {
 714                         if (!valid_hex(name[i])) {
 715                                 log_warnx("invalid character \"%c\" in target "
 716                                     "name \"%s\"; allowed characters are 1-9 "
 717                                     "and A-F", name[i], name);
 718                                 break;
 719                         }
 720                 }
 721         } else if (strncasecmp(name, "naa.", strlen("naa.")) == 0) {
 722                 if (strlen(name) > strlen("naa.") + 32)
 723                         log_warnx("invalid target name \"%s\"; the \"naa.\" "
 724                             "should be followed by at most 32 hexadecimal "
 725                             "digits", name);
 726                 for (i = strlen("naa."); name[i] != '\0'; i++) {
 727                         if (!valid_hex(name[i])) {
 728                                 log_warnx("invalid character \"%c\" in target "
 729                                     "name \"%s\"; allowed characters are 1-9 "
 730                                     "and A-F", name[i], name);
 731                                 break;
 732                         }
 733                 }
 734         } else {
 735                 log_warnx("invalid target name \"%s\"; should start with "
 736                     "either \".iqn\", \"eui.\", or \"naa.\"",
 737                     name);
 738         }
 739         return (true);
 740 }
 741
 742 struct target *
 743 target_new(struct conf *conf, const char *name)
 744 {
 745         struct target *targ;
 746         int i, len;
 747
 748         targ = target_find(conf, name);
 749         if (targ != NULL) {
 750                 log_warnx("duplicated target \"%s\"", name);
 751                 return (NULL);
 752         }
 753         if (valid_iscsi_name(name) == false) {
 754                 log_warnx("target name \"%s\" is invalid", name);
 755                 return (NULL);
 756         }
 757         targ = calloc(1, sizeof(*targ));
 758         if (targ == NULL)
 759                 log_err(1, "calloc");
 760         targ->t_name = checked_strdup(name);
 761
 762         /*
 763          * RFC 3722 requires us to normalize the name to lowercase.
 764          */
 765         len = strlen(name);
 766         for (i = 0; i < len; i++)
 767                 targ->t_name[i] = tolower(targ->t_name[i]);
 768
 769         TAILQ_INIT(&targ->t_luns);
 770         targ->t_conf = conf;
 771         TAILQ_INSERT_TAIL(&conf->conf_targets, targ, t_next);
 772
 773         return (targ);
 774 }
 775
 776 void
 777 target_delete(struct target *targ)
 778 {
 779         struct lun *lun, *tmp;
 780
 781         TAILQ_REMOVE(&targ->t_conf->conf_targets, targ, t_next);
 782
 783         TAILQ_FOREACH_SAFE(lun, &targ->t_luns, l_next, tmp)
 784                 lun_delete(lun);
 785         free(targ->t_name);
 786         free(targ);
 787 }
 788
 789 struct target *
 790 target_find(struct conf *conf, const char *name)
 791 {
 792         struct target *targ;
 793
 794         TAILQ_FOREACH(targ, &conf->conf_targets, t_next) {
 795                 if (strcasecmp(targ->t_name, name) == 0)
 796                         return (targ);
 797         }
 798
 799         return (NULL);
 800 }
 801
 802 struct lun *
 803 lun_new(struct target *targ, int lun_id)
 804 {
 805         struct lun *lun;
 806
 807         lun = lun_find(targ, lun_id);
 808         if (lun != NULL) {
 809                 log_warnx("duplicated lun %d for target \"%s\"",
 810                     lun_id, targ->t_name);
 811                 return (NULL);
 812         }
 813
 814         lun = calloc(1, sizeof(*lun));
 815         if (lun == NULL)
 816                 log_err(1, "calloc");
 817         lun->l_lun = lun_id;
 818         TAILQ_INIT(&lun->l_options);
 819         lun->l_target = targ;
 820         TAILQ_INSERT_TAIL(&targ->t_luns, lun, l_next);
 821
 822         return (lun);
 823 }
 824
 825 void
 826 lun_delete(struct lun *lun)
 827 {
 828         struct lun_option *lo, *tmp;
 829
 830         TAILQ_REMOVE(&lun->l_target->t_luns, lun, l_next);
 831
 832         TAILQ_FOREACH_SAFE(lo, &lun->l_options, lo_next, tmp)
 833                 lun_option_delete(lo);
 834         free(lun->l_backend);
 835         free(lun->l_device_id);
 836         free(lun->l_path);
 837         free(lun->l_serial);
 838         free(lun);
 839 }
 840
 841 struct lun *
 842 lun_find(struct target *targ, int lun_id)
 843 {
 844         struct lun *lun;
 845
 846         TAILQ_FOREACH(lun, &targ->t_luns, l_next) {
 847                 if (lun->l_lun == lun_id)
 848                         return (lun);
 849         }
 850
 851         return (NULL);
 852 }
 853
 854 void
 855 lun_set_backend(struct lun *lun, const char *value)
 856 {
 857         free(lun->l_backend);
 858         lun->l_backend = checked_strdup(value);
 859 }
 860
 861 void
 862 lun_set_blocksize(struct lun *lun, size_t value)
 863 {
 864
 865         lun->l_blocksize = value;
 866 }
 867
 868 void
 869 lun_set_device_id(struct lun *lun, const char *value)
 870 {
 871         free(lun->l_device_id);
 872         lun->l_device_id = checked_strdup(value);
 873 }
 874
 875 void
 876 lun_set_path(struct lun *lun, const char *value)
 877 {
 878         free(lun->l_path);
 879         lun->l_path = checked_strdup(value);
 880 }
 881
 882 void
 883 lun_set_serial(struct lun *lun, const char *value)
 884 {
 885         free(lun->l_serial);
 886         lun->l_serial = checked_strdup(value);
 887 }
 888
 889 void
 890 lun_set_size(struct lun *lun, size_t value)
 891 {
 892
 893         lun->l_size = value;
 894 }
 895
 896 void
 897 lun_set_ctl_lun(struct lun *lun, uint32_t value)
 898 {
 899
 900         lun->l_ctl_lun = value;
 901 }
 902
 903 struct lun_option *
 904 lun_option_new(struct lun *lun, const char *name, const char *value)
 905 {
 906         struct lun_option *lo;
 907
 908         lo = lun_option_find(lun, name);
 909         if (lo != NULL) {
 910                 log_warnx("duplicated lun option %s for lun %d, target \"%s\"",
 911                     name, lun->l_lun, lun->l_target->t_name);
 912                 return (NULL);
 913         }
 914
 915         lo = calloc(1, sizeof(*lo));
 916         if (lo == NULL)
 917                 log_err(1, "calloc");
 918         lo->lo_name = checked_strdup(name);
 919         lo->lo_value = checked_strdup(value);
 920         lo->lo_lun = lun;
 921         TAILQ_INSERT_TAIL(&lun->l_options, lo, lo_next);
 922
 923         return (lo);
 924 }
 925
 926 void
 927 lun_option_delete(struct lun_option *lo)
 928 {
 929
 930         TAILQ_REMOVE(&lo->lo_lun->l_options, lo, lo_next);
 931
 932         free(lo->lo_name);
 933         free(lo->lo_value);
 934         free(lo);
 935 }
 936
 937 struct lun_option *
 938 lun_option_find(struct lun *lun, const char *name)
 939 {
 940         struct lun_option *lo;
 941
 942         TAILQ_FOREACH(lo, &lun->l_options, lo_next) {
 943                 if (strcmp(lo->lo_name, name) == 0)
 944                         return (lo);
 945         }
 946
 947         return (NULL);
 948 }
 949
 950 void
 951 lun_option_set(struct lun_option *lo, const char *value)
 952 {
 953
 954         free(lo->lo_value);
 955         lo->lo_value = checked_strdup(value);
 956 }
 957
 958 static struct connection *
 959 connection_new(struct portal *portal, int fd, const char *host)
 960 {
 961         struct connection *conn;
 962
 963         conn = calloc(1, sizeof(*conn));
 964         if (conn == NULL)
 965                 log_err(1, "calloc");
 966         conn->conn_portal = portal;
 967         conn->conn_socket = fd;
 968         conn->conn_initiator_addr = checked_strdup(host);
 969
 970         /*
 971          * Default values, from RFC 3720, section 12.
 972          */
 973         conn->conn_max_data_segment_length = 8192;
 974         conn->conn_max_burst_length = 262144;
 975         conn->conn_immediate_data = true;
 976
 977         return (conn);
 978 }
 979
 980 #if 0
 981 static void
 982 conf_print(struct conf *conf)
 983 {
 984         struct auth_group *ag;
 985         struct auth *auth;
 986         struct auth_name *auth_name;
 987         struct auth_portal *auth_portal;
 988         struct portal_group *pg;
 989         struct portal *portal;
 990         struct target *targ;
 991         struct lun *lun;
 992         struct lun_option *lo;
 993
 994         TAILQ_FOREACH(ag, &conf->conf_auth_groups, ag_next) {
 995                 fprintf(stderr, "auth-group %s {\n", ag->ag_name);
 996                 TAILQ_FOREACH(auth, &ag->ag_auths, a_next)
 997                         fprintf(stderr, "\t chap-mutual %s %s %s %s\n",
 998                             auth->a_user, auth->a_secret,
 999                             auth->a_mutual_user, auth->a_mutual_secret);
1000                 TAILQ_FOREACH(auth_name, &ag->ag_names, an_next)
1001                         fprintf(stderr, "\t initiator-name %s\n",
1002                             auth_name->an_initator_name);
1003                 TAILQ_FOREACH(auth_portal, &ag->ag_portals, an_next)
1004                         fprintf(stderr, "\t initiator-portal %s\n",
1005                             auth_portal->an_initator_portal);
1006                 fprintf(stderr, "}\n");
1007         }
1008         TAILQ_FOREACH(pg, &conf->conf_portal_groups, pg_next) {
1009                 fprintf(stderr, "portal-group %s {\n", pg->pg_name);
1010                 TAILQ_FOREACH(portal, &pg->pg_portals, p_next)
1011                         fprintf(stderr, "\t listen %s\n", portal->p_listen);
1012                 fprintf(stderr, "}\n");
1013         }
1014         TAILQ_FOREACH(targ, &conf->conf_targets, t_next) {
1015                 fprintf(stderr, "target %s {\n", targ->t_name);
1016                 if (targ->t_alias != NULL)
1017                         fprintf(stderr, "\t alias %s\n", targ->t_alias);
1018                 TAILQ_FOREACH(lun, &targ->t_luns, l_next) {
1019                         fprintf(stderr, "\tlun %d {\n", lun->l_lun);
1020                         fprintf(stderr, "\t\tpath %s\n", lun->l_path);
1021                         TAILQ_FOREACH(lo, &lun->l_options, lo_next)
1022                                 fprintf(stderr, "\t\toption %s %s\n",
1023                                     lo->lo_name, lo->lo_value);
1024                         fprintf(stderr, "\t}\n");
1025                 }
1026                 fprintf(stderr, "}\n");
1027         }
1028 }
1029 #endif
1030
1031 static int
1032 conf_verify_lun(struct lun *lun)
1033 {
1034         const struct lun *lun2;
1035         const struct target *targ2;
1036
1037         if (lun->l_backend == NULL)
1038                 lun_set_backend(lun, "block");
1039         if (strcmp(lun->l_backend, "block") == 0) {
1040                 if (lun->l_path == NULL) {
1041                         log_warnx("missing path for lun %d, target \"%s\"",
1042                             lun->l_lun, lun->l_target->t_name);
1043                         return (1);
1044                 }
1045         } else if (strcmp(lun->l_backend, "ramdisk") == 0) {
1046                 if (lun->l_size == 0) {
1047                         log_warnx("missing size for ramdisk-backed lun %d, "
1048                             "target \"%s\"", lun->l_lun, lun->l_target->t_name);
1049                         return (1);
1050                 }
1051                 if (lun->l_path != NULL) {
1052                         log_warnx("path must not be specified "
1053                             "for ramdisk-backed lun %d, target \"%s\"",
1054                             lun->l_lun, lun->l_target->t_name);
1055                         return (1);
1056                 }
1057         }
1058         if (lun->l_lun < 0 || lun->l_lun > 255) {
1059                 log_warnx("invalid lun number for lun %d, target \"%s\"; "
1060                     "must be between 0 and 255", lun->l_lun,
1061                     lun->l_target->t_name);
1062                 return (1);
1063         }
1064         if (lun->l_blocksize == 0) {
1065                 lun_set_blocksize(lun, DEFAULT_BLOCKSIZE);
1066         } else if (lun->l_blocksize < 0) {
1067                 log_warnx("invalid blocksize for lun %d, target \"%s\"; "
1068                     "must be larger than 0", lun->l_lun, lun->l_target->t_name);
1069                 return (1);
1070         }
1071         if (lun->l_size != 0 && lun->l_size % lun->l_blocksize != 0) {
1072                 log_warnx("invalid size for lun %d, target \"%s\"; "
1073                     "must be multiple of blocksize", lun->l_lun,
1074                     lun->l_target->t_name);
1075                 return (1);
1076         }
1077         TAILQ_FOREACH(targ2, &lun->l_target->t_conf->conf_targets, t_next) {
1078                 TAILQ_FOREACH(lun2, &targ2->t_luns, l_next) {
1079                         if (lun == lun2)
1080                                 continue;
1081                         if (lun->l_path != NULL && lun2->l_path != NULL &&
1082                             strcmp(lun->l_path, lun2->l_path) == 0) {
1083                                 log_debugx("WARNING: path \"%s\" duplicated "
1084                                     "between lun %d, target \"%s\", and "
1085                                     "lun %d, target \"%s\"", lun->l_path,
1086                                     lun->l_lun, lun->l_target->t_name,
1087                                     lun2->l_lun, lun2->l_target->t_name);
1088                         }
1089                 }
1090         }
1091
1092         return (0);
1093 }
1094
1095 int
1096 conf_verify(struct conf *conf)
1097 {
1098         struct auth_group *ag;
1099         struct portal_group *pg;
1100         struct target *targ;
1101         struct lun *lun;
1102         bool found_lun0;
1103         int error;
1104
1105         if (conf->conf_pidfile_path == NULL)
1106                 conf->conf_pidfile_path = checked_strdup(DEFAULT_PIDFILE);
1107
1108         TAILQ_FOREACH(targ, &conf->conf_targets, t_next) {
1109                 if (targ->t_auth_group == NULL) {
1110                         targ->t_auth_group = auth_group_find(conf,
1111                             "default");
1112                         assert(targ->t_auth_group != NULL);
1113                 }
1114                 if (targ->t_portal_group == NULL) {
1115                         targ->t_portal_group = portal_group_find(conf,
1116                             "default");
1117                         assert(targ->t_portal_group != NULL);
1118                 }
1119                 found_lun0 = false;
1120                 TAILQ_FOREACH(lun, &targ->t_luns, l_next) {
1121                         error = conf_verify_lun(lun);
1122                         if (error != 0)
1123                                 return (error);
1124                         if (lun->l_lun == 0)
1125                                 found_lun0 = true;
1126                 }
1127                 if (!found_lun0) {
1128                         log_warnx("mandatory LUN 0 not configured "
1129                             "for target \"%s\"", targ->t_name);
1130                         return (1);
1131                 }
1132         }
1133         TAILQ_FOREACH(pg, &conf->conf_portal_groups, pg_next) {
1134                 assert(pg->pg_name != NULL);
1135                 if (pg->pg_discovery_auth_group == NULL) {
1136                         pg->pg_discovery_auth_group =
1137                             auth_group_find(conf, "default");
1138                         assert(pg->pg_discovery_auth_group != NULL);
1139                 }
1140
1141                 TAILQ_FOREACH(targ, &conf->conf_targets, t_next) {
1142                         if (targ->t_portal_group == pg)
1143                                 break;
1144                 }
1145                 if (targ == NULL) {
1146                         if (strcmp(pg->pg_name, "default") != 0)
1147                                 log_warnx("portal-group \"%s\" not assigned "
1148                                     "to any target", pg->pg_name);
1149                         pg->pg_unassigned = true;
1150                 } else
1151                         pg->pg_unassigned = false;
1152         }
1153         TAILQ_FOREACH(ag, &conf->conf_auth_groups, ag_next) {
1154                 if (ag->ag_name == NULL)
1155                         assert(ag->ag_target != NULL);
1156                 else
1157                         assert(ag->ag_target == NULL);
1158
1159                 TAILQ_FOREACH(targ, &conf->conf_targets, t_next) {
1160                         if (targ->t_auth_group == ag)
1161                                 break;
1162                 }
1163                 if (targ == NULL && ag->ag_name != NULL &&
1164                     strcmp(ag->ag_name, "default") != 0 &&
1165                     strcmp(ag->ag_name, "no-authentication") != 0 &&
1166                     strcmp(ag->ag_name, "no-access") != 0) {
1167                         log_warnx("auth-group \"%s\" not assigned "
1168                             "to any target", ag->ag_name);
1169                 }
1170         }
1171
1172         return (0);
1173 }
1174
1175 static int
1176 conf_apply(struct conf *oldconf, struct conf *newconf)
1177 {
1178         struct target *oldtarg, *newtarg, *tmptarg;
1179         struct lun *oldlun, *newlun, *tmplun;
1180         struct portal_group *oldpg, *newpg;
1181         struct portal *oldp, *newp;
1182         pid_t otherpid;
1183         int changed, cumulated_error = 0, error;
1184 #ifndef ICL_KERNEL_PROXY
1185         int one = 1;
1186 #endif
1187
1188         if (oldconf->conf_debug != newconf->conf_debug) {
1189                 log_debugx("changing debug level to %d", newconf->conf_debug);
1190                 log_init(newconf->conf_debug);
1191         }
1192
1193         if (oldconf->conf_pidfh != NULL) {
1194                 assert(oldconf->conf_pidfile_path != NULL);
1195                 if (newconf->conf_pidfile_path != NULL &&
1196                     strcmp(oldconf->conf_pidfile_path,
1197                     newconf->conf_pidfile_path) == 0) {
1198                         newconf->conf_pidfh = oldconf->conf_pidfh;
1199                         oldconf->conf_pidfh = NULL;
1200                 } else {
1201                         log_debugx("removing pidfile %s",
1202                             oldconf->conf_pidfile_path);
1203                         pidfile_remove(oldconf->conf_pidfh);
1204                         oldconf->conf_pidfh = NULL;
1205                 }
1206         }
1207
1208         if (newconf->conf_pidfh == NULL && newconf->conf_pidfile_path != NULL) {
1209                 log_debugx("opening pidfile %s", newconf->conf_pidfile_path);
1210                 newconf->conf_pidfh =
1211                     pidfile_open(newconf->conf_pidfile_path, 0600, &otherpid);
1212                 if (newconf->conf_pidfh == NULL) {
1213                         if (errno == EEXIST)
1214                                 log_errx(1, "daemon already running, pid: %jd.",
1215                                     (intmax_t)otherpid);
1216                         log_err(1, "cannot open or create pidfile \"%s\"",
1217                             newconf->conf_pidfile_path);
1218                 }
1219         }
1220
1221         TAILQ_FOREACH_SAFE(oldtarg, &oldconf->conf_targets, t_next, tmptarg) {
1222                 /*
1223                  * First, remove any targets present in the old configuration
1224                  * and missing in the new one.
1225                  */
1226                 newtarg = target_find(newconf, oldtarg->t_name);
1227                 if (newtarg == NULL) {
1228                         TAILQ_FOREACH_SAFE(oldlun, &oldtarg->t_luns, l_next,
1229                             tmplun) {
1230                                 log_debugx("target %s not found in new "
1231                                     "configuration; removing its lun %d, "
1232                                     "backed by CTL lun %d",
1233                                     oldtarg->t_name, oldlun->l_lun,
1234                                     oldlun->l_ctl_lun);
1235                                 error = kernel_lun_remove(oldlun);
1236                                 if (error != 0) {
1237                                         log_warnx("failed to remove lun %d, "
1238                                             "target %s, CTL lun %d",
1239                                             oldlun->l_lun, oldtarg->t_name,
1240                                             oldlun->l_ctl_lun);
1241                                         cumulated_error++;
1242                                 }
1243                                 lun_delete(oldlun);
1244                         }
1245                         target_delete(oldtarg);
1246                         continue;
1247                 }
1248
1249                 /*
1250                  * Second, remove any LUNs present in the old target
1251                  * and missing in the new one.
1252                  */
1253                 TAILQ_FOREACH_SAFE(oldlun, &oldtarg->t_luns, l_next, tmplun) {
1254                         newlun = lun_find(newtarg, oldlun->l_lun);
1255                         if (newlun == NULL) {
1256                                 log_debugx("lun %d, target %s, CTL lun %d "
1257                                     "not found in new configuration; "
1258                                     "removing", oldlun->l_lun, oldtarg->t_name,
1259                                     oldlun->l_ctl_lun);
1260                                 error = kernel_lun_remove(oldlun);
1261                                 if (error != 0) {
1262                                         log_warnx("failed to remove lun %d, "
1263                                             "target %s, CTL lun %d",
1264                                             oldlun->l_lun, oldtarg->t_name,
1265                                             oldlun->l_ctl_lun);
1266                                         cumulated_error++;
1267                                 }
1268                                 lun_delete(oldlun);
1269                                 continue;
1270                         }
1271
1272                         /*
1273                          * Also remove the LUNs changed by more than size.
1274                          */
1275                         changed = 0;
1276                         assert(oldlun->l_backend != NULL);
1277                         assert(newlun->l_backend != NULL);
1278                         if (strcmp(newlun->l_backend, oldlun->l_backend) != 0) {
1279                                 log_debugx("backend for lun %d, target %s, "
1280                                     "CTL lun %d changed; removing",
1281                                     oldlun->l_lun, oldtarg->t_name,
1282                                     oldlun->l_ctl_lun);
1283                                 changed = 1;
1284                         }
1285                         if (oldlun->l_blocksize != newlun->l_blocksize) {
1286                                 log_debugx("blocksize for lun %d, target %s, "
1287                                     "CTL lun %d changed; removing",
1288                                     oldlun->l_lun, oldtarg->t_name,
1289                                     oldlun->l_ctl_lun);
1290                                 changed = 1;
1291                         }
1292                         if (newlun->l_device_id != NULL &&
1293                             (oldlun->l_device_id == NULL ||
1294                              strcmp(oldlun->l_device_id, newlun->l_device_id) !=
1295                              0)) {
1296                                 log_debugx("device-id for lun %d, target %s, "
1297                                     "CTL lun %d changed; removing",
1298                                     oldlun->l_lun, oldtarg->t_name,
1299                                     oldlun->l_ctl_lun);
1300                                 changed = 1;
1301                         }
1302                         if (newlun->l_path != NULL &&
1303                             (oldlun->l_path == NULL ||
1304                              strcmp(oldlun->l_path, newlun->l_path) != 0)) {
1305                                 log_debugx("path for lun %d, target %s, "
1306                                     "CTL lun %d, changed; removing",
1307                                     oldlun->l_lun, oldtarg->t_name,
1308                                     oldlun->l_ctl_lun);
1309                                 changed = 1;
1310                         }
1311                         if (newlun->l_serial != NULL &&
1312                             (oldlun->l_serial == NULL ||
1313                              strcmp(oldlun->l_serial, newlun->l_serial) != 0)) {
1314                                 log_debugx("serial for lun %d, target %s, "
1315                                     "CTL lun %d changed; removing",
1316                                     oldlun->l_lun, oldtarg->t_name,
1317                                     oldlun->l_ctl_lun);
1318                                 changed = 1;
1319                         }
1320                         if (changed) {
1321                                 error = kernel_lun_remove(oldlun);
1322                                 if (error != 0) {
1323                                         log_warnx("failed to remove lun %d, "
1324                                             "target %s, CTL lun %d",
1325                                             oldlun->l_lun, oldtarg->t_name,
1326                                             oldlun->l_ctl_lun);
1327                                         cumulated_error++;
1328                                 }
1329                                 lun_delete(oldlun);
1330                                 continue;
1331                         }
1332
1333                         lun_set_ctl_lun(newlun, oldlun->l_ctl_lun);
1334                 }
1335         }
1336
1337         /*
1338          * Now add new targets or modify existing ones.
1339          */
1340         TAILQ_FOREACH(newtarg, &newconf->conf_targets, t_next) {
1341                 oldtarg = target_find(oldconf, newtarg->t_name);
1342
1343                 TAILQ_FOREACH(newlun, &newtarg->t_luns, l_next) {
1344                         if (oldtarg != NULL) {
1345                                 oldlun = lun_find(oldtarg, newlun->l_lun);
1346                                 if (oldlun != NULL) {
1347                                         if (newlun->l_size != oldlun->l_size) {
1348                                                 log_debugx("resizing lun %d, "
1349                                                     "target %s, CTL lun %d",
1350                                                     newlun->l_lun,
1351                                                     newtarg->t_name,
1352                                                     newlun->l_ctl_lun);
1353                                                 error =
1354                                                     kernel_lun_resize(newlun);
1355                                                 if (error != 0) {
1356                                                         log_warnx("failed to "
1357                                                             "resize lun %d, "
1358                                                             "target %s, "
1359                                                             "CTL lun %d",
1360                                                             newlun->l_lun,
1361                                                             newtarg->t_name,
1362                                                             newlun->l_lun);
1363                                                         cumulated_error++;
1364                                                 }
1365                                         }
1366                                         continue;
1367                                 }
1368                         }
1369                         log_debugx("adding lun %d, target %s",
1370                             newlun->l_lun, newtarg->t_name);
1371                         error = kernel_lun_add(newlun);
1372                         if (error != 0) {
1373                                 log_warnx("failed to add lun %d, target %s",
1374                                     newlun->l_lun, newtarg->t_name);
1375                                 cumulated_error++;
1376                         }
1377                 }
1378         }
1379
1380         /*
1381          * Go through the new portals, opening the sockets as neccessary.
1382          */
1383         TAILQ_FOREACH(newpg, &newconf->conf_portal_groups, pg_next) {
1384                 if (newpg->pg_unassigned) {
1385                         log_debugx("not listening on portal-group \"%s\", "
1386                             "not assigned to any target",
1387                             newpg->pg_name);
1388                         continue;
1389                 }
1390                 TAILQ_FOREACH(newp, &newpg->pg_portals, p_next) {
1391                         /*
1392                          * Try to find already open portal and reuse
1393                          * the listening socket.  We don't care about
1394                          * what portal or portal group that was, what
1395                          * matters is the listening address.
1396                          */
1397                         TAILQ_FOREACH(oldpg, &oldconf->conf_portal_groups,
1398                             pg_next) {
1399                                 TAILQ_FOREACH(oldp, &oldpg->pg_portals,
1400                                     p_next) {
1401                                         if (strcmp(newp->p_listen,
1402                                             oldp->p_listen) == 0 &&
1403                                             oldp->p_socket > 0) {
1404                                                 newp->p_socket =
1405                                                     oldp->p_socket;
1406                                                 oldp->p_socket = 0;
1407                                                 break;
1408                                         }
1409                                 }
1410                         }
1411                         if (newp->p_socket > 0) {
1412                                 /*
1413                                  * We're done with this portal.
1414                                  */
1415                                 continue;
1416                         }
1417
1418 #ifdef ICL_KERNEL_PROXY
1419                         log_debugx("listening on %s, portal-group \"%s\" using ICL proxy",
1420                             newp->p_listen, newpg->pg_name);
1421                         kernel_listen(newp->p_ai, newp->p_iser);
1422 #else
1423                         assert(newp->p_iser == false);
1424
1425                         log_debugx("listening on %s, portal-group \"%s\"",
1426                             newp->p_listen, newpg->pg_name);
1427                         newp->p_socket = socket(newp->p_ai->ai_family,
1428                             newp->p_ai->ai_socktype,
1429                             newp->p_ai->ai_protocol);
1430                         if (newp->p_socket < 0) {
1431                                 log_warn("socket(2) failed for %s",
1432                                     newp->p_listen);
1433                                 cumulated_error++;
1434                                 continue;
1435                         }
1436                         error = setsockopt(newp->p_socket, SOL_SOCKET,
1437                             SO_REUSEADDR, &one, sizeof(one));
1438                         if (error != 0) {
1439                                 log_warn("setsockopt(SO_REUSEADDR) failed "
1440                                     "for %s", newp->p_listen);
1441                                 close(newp->p_socket);
1442                                 newp->p_socket = 0;
1443                                 cumulated_error++;
1444                                 continue;
1445                         }
1446                         error = bind(newp->p_socket, newp->p_ai->ai_addr,
1447                             newp->p_ai->ai_addrlen);
1448                         if (error != 0) {
1449                                 log_warn("bind(2) failed for %s",
1450                                     newp->p_listen);
1451                                 close(newp->p_socket);
1452                                 newp->p_socket = 0;
1453                                 cumulated_error++;
1454                                 continue;
1455                         }
1456                         error = listen(newp->p_socket, -1);
1457                         if (error != 0) {
1458                                 log_warn("listen(2) failed for %s",
1459                                     newp->p_listen);
1460                                 close(newp->p_socket);
1461                                 newp->p_socket = 0;
1462                                 cumulated_error++;
1463                                 continue;
1464                         }
1465 #endif /* !ICL_KERNEL_PROXY */
1466                 }
1467         }
1468
1469         /*
1470          * Go through the no longer used sockets, closing them.
1471          */
1472         TAILQ_FOREACH(oldpg, &oldconf->conf_portal_groups, pg_next) {
1473                 TAILQ_FOREACH(oldp, &oldpg->pg_portals, p_next) {
1474                         if (oldp->p_socket <= 0)
1475                                 continue;
1476                         log_debugx("closing socket for %s, portal-group \"%s\"",
1477                             oldp->p_listen, oldpg->pg_name);
1478                         close(oldp->p_socket);
1479                         oldp->p_socket = 0;
1480                 }
1481         }
1482
1483         return (cumulated_error);
1484 }
1485
1486 bool
1487 timed_out(void)
1488 {
1489
1490         return (sigalrm_received);
1491 }
1492
1493 static void
1494 sigalrm_handler(int dummy __unused)
1495 {
1496         /*
1497          * It would be easiest to just log an error and exit.  We can't
1498          * do this, though, because log_errx() is not signal safe, since
1499          * it calls syslog(3).  Instead, set a flag checked by pdu_send()
1500          * and pdu_receive(), to call log_errx() there.  Should they fail
1501          * to notice, we'll exit here one second later.
1502          */
1503         if (sigalrm_received) {
1504                 /*
1505                  * Oh well.  Just give up and quit.
1506                  */
1507                 _exit(2);
1508         }
1509
1510         sigalrm_received = true;
1511 }
1512
1513 static void
1514 set_timeout(const struct conf *conf)
1515 {
1516         struct sigaction sa;
1517         struct itimerval itv;
1518         int error;
1519
1520         if (conf->conf_timeout <= 0) {
1521                 log_debugx("session timeout disabled");
1522                 return;
1523         }
1524
1525         bzero(&sa, sizeof(sa));
1526         sa.sa_handler = sigalrm_handler;
1527         sigfillset(&sa.sa_mask);
1528         error = sigaction(SIGALRM, &sa, NULL);
1529         if (error != 0)
1530                 log_err(1, "sigaction");
1531
1532         /*
1533          * First SIGALRM will arive after conf_timeout seconds.
1534          * If we do nothing, another one will arrive a second later.
1535          */
1536         bzero(&itv, sizeof(itv));
1537         itv.it_interval.tv_sec = 1;
1538         itv.it_value.tv_sec = conf->conf_timeout;
1539
1540         log_debugx("setting session timeout to %d seconds",
1541             conf->conf_timeout);
1542         error = setitimer(ITIMER_REAL, &itv, NULL);
1543         if (error != 0)
1544                 log_err(1, "setitimer");
1545 }
1546
1547 static int
1548 wait_for_children(bool block)
1549 {
1550         pid_t pid;
1551         int status;
1552         int num = 0;
1553
1554         for (;;) {
1555                 /*
1556                  * If "block" is true, wait for at least one process.
1557                  */
1558                 if (block && num == 0)
1559                         pid = wait4(-1, &status, 0, NULL);
1560                 else
1561                         pid = wait4(-1, &status, WNOHANG, NULL);
1562                 if (pid <= 0)
1563                         break;
1564                 if (WIFSIGNALED(status)) {
1565                         log_warnx("child process %d terminated with signal %d",
1566                             pid, WTERMSIG(status));
1567                 } else if (WEXITSTATUS(status) != 0) {
1568                         log_warnx("child process %d terminated with exit status %d",
1569                             pid, WEXITSTATUS(status));
1570                 } else {
1571                         log_debugx("child process %d terminated gracefully", pid);
1572                 }
1573                 num++;
1574         }
1575
1576         return (num);
1577 }
1578
1579 static void
1580 handle_connection(struct portal *portal, int fd, bool dont_fork)
1581 {
1582         struct connection *conn;
1583 #ifndef ICL_KERNEL_PROXY
1584         struct sockaddr_storage ss;
1585         socklen_t sslen = sizeof(ss);
1586         int error;
1587 #endif
1588         pid_t pid;
1589         char host[NI_MAXHOST + 1];
1590         struct conf *conf;
1591
1592         conf = portal->p_portal_group->pg_conf;
1593
1594         if (dont_fork) {
1595                 log_debugx("incoming connection; not forking due to -d flag");
1596         } else {
1597                 nchildren -= wait_for_children(false);
1598                 assert(nchildren >= 0);
1599
1600                 while (conf->conf_maxproc > 0 && nchildren >= conf->conf_maxproc) {
1601                         log_debugx("maxproc limit of %d child processes hit; "
1602                             "waiting for child process to exit", conf->conf_maxproc);
1603                         nchildren -= wait_for_children(true);
1604                         assert(nchildren >= 0);
1605                 }
1606                 log_debugx("incoming connection; forking child process #%d",
1607                     nchildren);
1608                 nchildren++;
1609                 pid = fork();
1610                 if (pid < 0)
1611                         log_err(1, "fork");
1612                 if (pid > 0) {
1613                         close(fd);
1614                         return;
1615                 }
1616         }
1617         pidfile_close(conf->conf_pidfh);
1618
1619 #ifdef ICL_KERNEL_PROXY
1620         /*
1621          * XXX
1622          */
1623         log_set_peer_addr("XXX");
1624 #else
1625         error = getpeername(fd, (struct sockaddr *)&ss, &sslen);
1626         if (error != 0)
1627                 log_err(1, "getpeername");
1628         error = getnameinfo((struct sockaddr *)&ss, sslen,
1629             host, sizeof(host), NULL, 0, NI_NUMERICHOST);
1630         if (error != 0)
1631                 log_errx(1, "getaddrinfo: %s", gai_strerror(error));
1632
1633         log_debugx("accepted connection from %s; portal group \"%s\"",
1634             host, portal->p_portal_group->pg_name);
1635         log_set_peer_addr(host);
1636         setproctitle("%s", host);
1637 #endif
1638
1639         conn = connection_new(portal, fd, host);
1640         set_timeout(conf);
1641         kernel_capsicate();
1642         login(conn);
1643         if (conn->conn_session_type == CONN_SESSION_TYPE_NORMAL) {
1644                 kernel_handoff(conn);
1645                 log_debugx("connection handed off to the kernel");
1646         } else {
1647                 assert(conn->conn_session_type == CONN_SESSION_TYPE_DISCOVERY);
1648                 discovery(conn);
1649         }
1650         log_debugx("nothing more to do; exiting");
1651         exit(0);
1652 }
1653
1654 #ifndef ICL_KERNEL_PROXY
1655 static int
1656 fd_add(int fd, fd_set *fdset, int nfds)
1657 {
1658
1659         /*
1660          * Skip sockets which we failed to bind.
1661          */
1662         if (fd <= 0)
1663                 return (nfds);
1664
1665         FD_SET(fd, fdset);
1666         if (fd > nfds)
1667                 nfds = fd;
1668         return (nfds);
1669 }
1670 #endif
1671
1672 static void
1673 main_loop(struct conf *conf, bool dont_fork)
1674 {
1675         struct portal_group *pg;
1676         struct portal *portal;
1677 #ifdef ICL_KERNEL_PROXY
1678         int connection_id;
1679 #else
1680         fd_set fdset;
1681         int error, nfds, client_fd;
1682 #endif
1683
1684         pidfile_write(conf->conf_pidfh);
1685
1686         for (;;) {
1687                 if (sighup_received || sigterm_received)
1688                         return;
1689
1690 #ifdef ICL_KERNEL_PROXY
1691                 connection_id = kernel_accept();
1692                 if (connection_id == 0)
1693                         continue;
1694
1695                 /*
1696                  * XXX: This is obviously temporary.
1697                  */
1698                 pg = TAILQ_FIRST(&conf->conf_portal_groups);
1699                 portal = TAILQ_FIRST(&pg->pg_portals);
1700
1701                 handle_connection(portal, connection_id, dont_fork);
1702 #else
1703                 FD_ZERO(&fdset);
1704                 nfds = 0;
1705                 TAILQ_FOREACH(pg, &conf->conf_portal_groups, pg_next) {
1706                         TAILQ_FOREACH(portal, &pg->pg_portals, p_next)
1707                                 nfds = fd_add(portal->p_socket, &fdset, nfds);
1708                 }
1709                 error = select(nfds + 1, &fdset, NULL, NULL, NULL);
1710                 if (error <= 0) {
1711                         if (errno == EINTR)
1712                                 return;
1713                         log_err(1, "select");
1714                 }
1715                 TAILQ_FOREACH(pg, &conf->conf_portal_groups, pg_next) {
1716                         TAILQ_FOREACH(portal, &pg->pg_portals, p_next) {
1717                                 if (!FD_ISSET(portal->p_socket, &fdset))
1718                                         continue;
1719                                 client_fd = accept(portal->p_socket, NULL, 0);
1720                                 if (client_fd < 0)
1721                                         log_err(1, "accept");
1722                                 handle_connection(portal, client_fd, dont_fork);
1723                                 break;
1724                         }
1725                 }
1726 #endif /* !ICL_KERNEL_PROXY */
1727         }
1728 }
1729
1730 static void
1731 sighup_handler(int dummy __unused)
1732 {
1733
1734         sighup_received = true;
1735 }
1736
1737 static void
1738 sigterm_handler(int dummy __unused)
1739 {
1740
1741         sigterm_received = true;
1742 }
1743
1744 static void
1745 sigchld_handler(int dummy __unused)
1746 {
1747
1748         /*
1749          * The only purpose of this handler is to make SIGCHLD
1750          * interrupt the ISCSIDWAIT ioctl(2), so we can call
1751          * wait_for_children().
1752          */
1753 }
1754
1755 static void
1756 register_signals(void)
1757 {
1758         struct sigaction sa;
1759         int error;
1760
1761         bzero(&sa, sizeof(sa));
1762         sa.sa_handler = sighup_handler;
1763         sigfillset(&sa.sa_mask);
1764         error = sigaction(SIGHUP, &sa, NULL);
1765         if (error != 0)
1766                 log_err(1, "sigaction");
1767
1768         sa.sa_handler = sigterm_handler;
1769         error = sigaction(SIGTERM, &sa, NULL);
1770         if (error != 0)
1771                 log_err(1, "sigaction");
1772
1773         sa.sa_handler = sigterm_handler;
1774         error = sigaction(SIGINT, &sa, NULL);
1775         if (error != 0)
1776                 log_err(1, "sigaction");
1777
1778         sa.sa_handler = sigchld_handler;
1779         error = sigaction(SIGCHLD, &sa, NULL);
1780         if (error != 0)
1781                 log_err(1, "sigaction");
1782 }
1783
1784 int
1785 main(int argc, char **argv)
1786 {
1787         struct conf *oldconf, *newconf, *tmpconf;
1788         const char *config_path = DEFAULT_CONFIG_PATH;
1789         int debug = 0, ch, error;
1790         bool dont_daemonize = false;
1791
1792         while ((ch = getopt(argc, argv, "df:")) != -1) {
1793                 switch (ch) {
1794                 case 'd':
1795                         dont_daemonize = true;
1796                         debug++;
1797                         break;
1798                 case 'f':
1799                         config_path = optarg;
1800                         break;
1801                 case '?':
1802                 default:
1803                         usage();
1804                 }
1805         }
1806         argc -= optind;
1807         if (argc != 0)
1808                 usage();
1809
1810         log_init(debug);
1811         kernel_init();
1812
1813         oldconf = conf_new_from_kernel();
1814         newconf = conf_new_from_file(config_path);
1815         if (newconf == NULL)
1816                 log_errx(1, "configuration error, exiting");
1817         if (debug > 0) {
1818                 oldconf->conf_debug = debug;
1819                 newconf->conf_debug = debug;
1820         }
1821
1822 #ifdef ICL_KERNEL_PROXY
1823         log_debugx("enabling CTL iSCSI port");
1824         error = kernel_port_on();
1825         if (error != 0)
1826                 log_errx(1, "failed to enable CTL iSCSI port, exiting");
1827 #endif
1828
1829         error = conf_apply(oldconf, newconf);
1830         if (error != 0)
1831                 log_errx(1, "failed to apply configuration, exiting");
1832         conf_delete(oldconf);
1833         oldconf = NULL;
1834
1835         register_signals();
1836
1837 #ifndef ICL_KERNEL_PROXY
1838         log_debugx("enabling CTL iSCSI port");
1839         error = kernel_port_on();
1840         if (error != 0)
1841                 log_errx(1, "failed to enable CTL iSCSI port, exiting");
1842 #endif
1843
1844         if (dont_daemonize == false) {
1845                 log_debugx("daemonizing");
1846                 if (daemon(0, 0) == -1) {
1847                         log_warn("cannot daemonize");
1848                         pidfile_remove(newconf->conf_pidfh);
1849                         exit(1);
1850                 }
1851         }
1852
1853         for (;;) {
1854                 main_loop(newconf, dont_daemonize);
1855                 if (sighup_received) {
1856                         sighup_received = false;
1857                         log_debugx("received SIGHUP, reloading configuration");
1858                         tmpconf = conf_new_from_file(config_path);
1859                         if (tmpconf == NULL) {
1860                                 log_warnx("configuration error, "
1861                                     "continuing with old configuration");
1862                         } else {
1863                                 if (debug > 0)
1864                                         tmpconf->conf_debug = debug;
1865                                 oldconf = newconf;
1866                                 newconf = tmpconf;
1867                                 error = conf_apply(oldconf, newconf);
1868                                 if (error != 0)
1869                                         log_warnx("failed to reload "
1870                                             "configuration");
1871                                 conf_delete(oldconf);
1872                                 oldconf = NULL;
1873                         }
1874                 } else if (sigterm_received) {
1875                         log_debugx("exiting on signal; "
1876                             "reloading empty configuration");
1877
1878                         log_debugx("disabling CTL iSCSI port "
1879                             "and terminating all connections");
1880                         error = kernel_port_off();
1881                         if (error != 0)
1882                                 log_warnx("failed to disable CTL iSCSI port");
1883
1884                         oldconf = newconf;
1885                         newconf = conf_new();
1886                         if (debug > 0)
1887                                 newconf->conf_debug = debug;
1888                         error = conf_apply(oldconf, newconf);
1889                         if (error != 0)
1890                                 log_warnx("failed to apply configuration");
1891
1892                         log_warnx("exiting on signal");
1893                         exit(0);
1894                 } else {
1895                         nchildren -= wait_for_children(false);
1896                         assert(nchildren >= 0);
1897                 }
1898         }
1899         /* NOTREACHED */
1900 }