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