usr.sbin/ctld/ctld.c

   1 /*-
   2  * Copyright (c) 2012 The FreeBSD Foundation
   3  * All rights reserved.
   4  *
   5  * This software was developed by Edward Tomasz Napierala under sponsorship
   6  * from the FreeBSD Foundation.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions
  10  * are met:
  11  * 1. Redistributions of source code must retain the above copyright
  12  *    notice, this list of conditions and the following disclaimer.
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in the
  15  *    documentation and/or other materials provided with the distribution.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  27  * SUCH DAMAGE.
  28  *
  29  */
  30
  31 #include <sys/cdefs.h>
  32 __FBSDID("$FreeBSD$");
  33
  34 #include <sys/types.h>
  35 #include <sys/time.h>
  36 #include <sys/socket.h>
  37 #include <sys/wait.h>
  38 #include <netinet/in.h>
  39 #include <arpa/inet.h>
  40 #include <assert.h>
  41 #include <ctype.h>
  42 #include <errno.h>
  43 #include <netdb.h>
  44 #include <signal.h>
  45 #include <stdbool.h>
  46 #include <stdio.h>
  47 #include <stdint.h>
  48 #include <stdlib.h>
  49 #include <string.h>
  50 #include <unistd.h>
  51
  52 #include "ctld.h"
  53 #include "isns.h"
  54
  55 bool proxy_mode = false;
  56
  57 static volatile bool sighup_received = false;
  58 static volatile bool sigterm_received = false;
  59 static volatile bool sigalrm_received = false;
  60
  61 static int nchildren = 0;
  62
  63 static void
  64 usage(void)
  65 {
  66
  67         fprintf(stderr, "usage: ctld [-d][-f config-file]\n");
  68         exit(1);
  69 }
  70
  71 char *
  72 checked_strdup(const char *s)
  73 {
  74         char *c;
  75
  76         c = strdup(s);
  77         if (c == NULL)
  78                 log_err(1, "strdup");
  79         return (c);
  80 }
  81
  82 struct conf *
  83 conf_new(void)
  84 {
  85         struct conf *conf;
  86
  87         conf = calloc(1, sizeof(*conf));
  88         if (conf == NULL)
  89                 log_err(1, "calloc");
  90         TAILQ_INIT(&conf->conf_targets);
  91         TAILQ_INIT(&conf->conf_auth_groups);
  92         TAILQ_INIT(&conf->conf_portal_groups);
  93         TAILQ_INIT(&conf->conf_isns);
  94
  95         conf->conf_isns_period = 900;
  96         conf->conf_isns_timeout = 5;
  97         conf->conf_debug = 0;
  98         conf->conf_timeout = 60;
  99         conf->conf_maxproc = 30;
 100
 101         return (conf);
 102 }
 103
 104 void
 105 conf_delete(struct conf *conf)
 106 {
 107         struct target *targ, *tmp;
 108         struct auth_group *ag, *cagtmp;
 109         struct portal_group *pg, *cpgtmp;
 110         struct isns *is, *istmp;
 111
 112         assert(conf->conf_pidfh == NULL);
 113
 114         TAILQ_FOREACH_SAFE(targ, &conf->conf_targets, t_next, tmp)
 115                 target_delete(targ);
 116         TAILQ_FOREACH_SAFE(ag, &conf->conf_auth_groups, ag_next, cagtmp)
 117                 auth_group_delete(ag);
 118         TAILQ_FOREACH_SAFE(pg, &conf->conf_portal_groups, pg_next, cpgtmp)
 119                 portal_group_delete(pg);
 120         TAILQ_FOREACH_SAFE(is, &conf->conf_isns, i_next, istmp)
 121                 isns_delete(is);
 122         free(conf->conf_pidfile_path);
 123         free(conf);
 124 }
 125
 126 static struct auth *
 127 auth_new(struct auth_group *ag)
 128 {
 129         struct auth *auth;
 130
 131         auth = calloc(1, sizeof(*auth));
 132         if (auth == NULL)
 133                 log_err(1, "calloc");
 134         auth->a_auth_group = ag;
 135         TAILQ_INSERT_TAIL(&ag->ag_auths, auth, a_next);
 136         return (auth);
 137 }
 138
 139 static void
 140 auth_delete(struct auth *auth)
 141 {
 142         TAILQ_REMOVE(&auth->a_auth_group->ag_auths, auth, a_next);
 143
 144         free(auth->a_user);
 145         free(auth->a_secret);
 146         free(auth->a_mutual_user);
 147         free(auth->a_mutual_secret);
 148         free(auth);
 149 }
 150
 151 const struct auth *
 152 auth_find(const struct auth_group *ag, const char *user)
 153 {
 154         const struct auth *auth;
 155
 156         TAILQ_FOREACH(auth, &ag->ag_auths, a_next) {
 157                 if (strcmp(auth->a_user, user) == 0)
 158                         return (auth);
 159         }
 160
 161         return (NULL);
 162 }
 163
 164 static void
 165 auth_check_secret_length(struct auth *auth)
 166 {
 167         size_t len;
 168
 169         len = strlen(auth->a_secret);
 170         if (len > 16) {
 171                 if (auth->a_auth_group->ag_name != NULL)
 172                         log_warnx("secret for user \"%s\", auth-group \"%s\", "
 173                             "is too long; it should be at most 16 characters "
 174                             "long", auth->a_user, auth->a_auth_group->ag_name);
 175                 else
 176                         log_warnx("secret for user \"%s\", target \"%s\", "
 177                             "is too long; it should be at most 16 characters "
 178                             "long", auth->a_user,
 179                             auth->a_auth_group->ag_target->t_name);
 180         }
 181         if (len < 12) {
 182                 if (auth->a_auth_group->ag_name != NULL)
 183                         log_warnx("secret for user \"%s\", auth-group \"%s\", "
 184                             "is too short; it should be at least 12 characters "
 185                             "long", auth->a_user,
 186                             auth->a_auth_group->ag_name);
 187                 else
 188                         log_warnx("secret for user \"%s\", target \"%s\", "
 189                             "is too short; it should be at least 16 characters "
 190                             "long", auth->a_user,
 191                             auth->a_auth_group->ag_target->t_name);
 192         }
 193
 194         if (auth->a_mutual_secret != NULL) {
 195                 len = strlen(auth->a_secret);
 196                 if (len > 16) {
 197                         if (auth->a_auth_group->ag_name != NULL)
 198                                 log_warnx("mutual secret for user \"%s\", "
 199                                     "auth-group \"%s\", is too long; it should "
 200                                     "be at most 16 characters long",
 201                                     auth->a_user, auth->a_auth_group->ag_name);
 202                         else
 203                                 log_warnx("mutual secret for user \"%s\", "
 204                                     "target \"%s\", is too long; it should "
 205                                     "be at most 16 characters long",
 206                                     auth->a_user,
 207                                     auth->a_auth_group->ag_target->t_name);
 208                 }
 209                 if (len < 12) {
 210                         if (auth->a_auth_group->ag_name != NULL)
 211                                 log_warnx("mutual secret for user \"%s\", "
 212                                     "auth-group \"%s\", is too short; it "
 213                                     "should be at least 12 characters long",
 214                                     auth->a_user, auth->a_auth_group->ag_name);
 215                         else
 216                                 log_warnx("mutual secret for user \"%s\", "
 217                                     "target \"%s\", is too short; it should be "
 218                                     "at least 16 characters long",
 219                                     auth->a_user,
 220                                     auth->a_auth_group->ag_target->t_name);
 221                 }
 222         }
 223 }
 224
 225 const struct auth *
 226 auth_new_chap(struct auth_group *ag, const char *user,
 227     const char *secret)
 228 {
 229         struct auth *auth;
 230
 231         if (ag->ag_type == AG_TYPE_UNKNOWN)
 232                 ag->ag_type = AG_TYPE_CHAP;
 233         if (ag->ag_type != AG_TYPE_CHAP) {
 234                 if (ag->ag_name != NULL)
 235                         log_warnx("cannot mix \"chap\" authentication with "
 236                             "other types for auth-group \"%s\"", ag->ag_name);
 237                 else
 238                         log_warnx("cannot mix \"chap\" authentication with "
 239                             "other types for target \"%s\"",
 240                             ag->ag_target->t_name);
 241                 return (NULL);
 242         }
 243
 244         auth = auth_new(ag);
 245         auth->a_user = checked_strdup(user);
 246         auth->a_secret = checked_strdup(secret);
 247
 248         auth_check_secret_length(auth);
 249
 250         return (auth);
 251 }
 252
 253 const struct auth *
 254 auth_new_chap_mutual(struct auth_group *ag, const char *user,
 255     const char *secret, const char *user2, const char *secret2)
 256 {
 257         struct auth *auth;
 258
 259         if (ag->ag_type == AG_TYPE_UNKNOWN)
 260                 ag->ag_type = AG_TYPE_CHAP_MUTUAL;
 261         if (ag->ag_type != AG_TYPE_CHAP_MUTUAL) {
 262                 if (ag->ag_name != NULL)
 263                         log_warnx("cannot mix \"chap-mutual\" authentication "
 264                             "with other types for auth-group \"%s\"",
 265                             ag->ag_name);
 266                 else
 267                         log_warnx("cannot mix \"chap-mutual\" authentication "
 268                             "with other types for target \"%s\"",
 269                             ag->ag_target->t_name);
 270                 return (NULL);
 271         }
 272
 273         auth = auth_new(ag);
 274         auth->a_user = checked_strdup(user);
 275         auth->a_secret = checked_strdup(secret);
 276         auth->a_mutual_user = checked_strdup(user2);
 277         auth->a_mutual_secret = checked_strdup(secret2);
 278
 279         auth_check_secret_length(auth);
 280
 281         return (auth);
 282 }
 283
 284 const struct auth_name *
 285 auth_name_new(struct auth_group *ag, const char *name)
 286 {
 287         struct auth_name *an;
 288
 289         an = calloc(1, sizeof(*an));
 290         if (an == NULL)
 291                 log_err(1, "calloc");
 292         an->an_auth_group = ag;
 293         an->an_initator_name = checked_strdup(name);
 294         TAILQ_INSERT_TAIL(&ag->ag_names, an, an_next);
 295         return (an);
 296 }
 297
 298 static void
 299 auth_name_delete(struct auth_name *an)
 300 {
 301         TAILQ_REMOVE(&an->an_auth_group->ag_names, an, an_next);
 302
 303         free(an->an_initator_name);
 304         free(an);
 305 }
 306
 307 bool
 308 auth_name_defined(const struct auth_group *ag)
 309 {
 310         if (TAILQ_EMPTY(&ag->ag_names))
 311                 return (false);
 312         return (true);
 313 }
 314
 315 const struct auth_name *
 316 auth_name_find(const struct auth_group *ag, const char *name)
 317 {
 318         const struct auth_name *auth_name;
 319
 320         TAILQ_FOREACH(auth_name, &ag->ag_names, an_next) {
 321                 if (strcmp(auth_name->an_initator_name, name) == 0)
 322                         return (auth_name);
 323         }
 324
 325         return (NULL);
 326 }
 327
 328 int
 329 auth_name_check(const struct auth_group *ag, const char *initiator_name)
 330 {
 331         if (!auth_name_defined(ag))
 332                 return (0);
 333
 334         if (auth_name_find(ag, initiator_name) == NULL)
 335                 return (1);
 336
 337         return (0);
 338 }
 339
 340 const struct auth_portal *
 341 auth_portal_new(struct auth_group *ag, const char *portal)
 342 {
 343         struct auth_portal *ap;
 344         char *net, *mask, *str, *tmp;
 345         int len, dm, m;
 346
 347         ap = calloc(1, sizeof(*ap));
 348         if (ap == NULL)
 349                 log_err(1, "calloc");
 350         ap->ap_auth_group = ag;
 351         ap->ap_initator_portal = checked_strdup(portal);
 352         mask = str = checked_strdup(portal);
 353         net = strsep(&mask, "/");
 354         if (net[0] == '[')
 355                 net++;
 356         len = strlen(net);
 357         if (len == 0)
 358                 goto error;
 359         if (net[len - 1] == ']')
 360                 net[len - 1] = 0;
 361         if (strchr(net, ':') != NULL) {
 362                 struct sockaddr_in6 *sin6 =
 363                     (struct sockaddr_in6 *)&ap->ap_sa;
 364
 365                 sin6->sin6_len = sizeof(*sin6);
 366                 sin6->sin6_family = AF_INET6;
 367                 if (inet_pton(AF_INET6, net, &sin6->sin6_addr) <= 0)
 368                         goto error;
 369                 dm = 128;
 370         } else {
 371                 struct sockaddr_in *sin =
 372                     (struct sockaddr_in *)&ap->ap_sa;
 373
 374                 sin->sin_len = sizeof(*sin);
 375                 sin->sin_family = AF_INET;
 376                 if (inet_pton(AF_INET, net, &sin->sin_addr) <= 0)
 377                         goto error;
 378                 dm = 32;
 379         }
 380         if (mask != NULL) {
 381                 m = strtol(mask, &tmp, 0);
 382                 if (m < 0 || m > dm || tmp[0] != 0)
 383                         goto error;
 384         } else
 385                 m = dm;
 386         ap->ap_mask = m;
 387         free(str);
 388         TAILQ_INSERT_TAIL(&ag->ag_portals, ap, ap_next);
 389         return (ap);
 390
 391 error:
 392         log_errx(1, "Incorrect initiator portal '%s'", portal);
 393         return (NULL);
 394 }
 395
 396 static void
 397 auth_portal_delete(struct auth_portal *ap)
 398 {
 399         TAILQ_REMOVE(&ap->ap_auth_group->ag_portals, ap, ap_next);
 400
 401         free(ap->ap_initator_portal);
 402         free(ap);
 403 }
 404
 405 bool
 406 auth_portal_defined(const struct auth_group *ag)
 407 {
 408         if (TAILQ_EMPTY(&ag->ag_portals))
 409                 return (false);
 410         return (true);
 411 }
 412
 413 const struct auth_portal *
 414 auth_portal_find(const struct auth_group *ag, const struct sockaddr_storage *ss)
 415 {
 416         const struct auth_portal *ap;
 417         const uint8_t *a, *b;
 418         int i;
 419         uint8_t bmask;
 420
 421         TAILQ_FOREACH(ap, &ag->ag_portals, ap_next) {
 422                 if (ap->ap_sa.ss_family != ss->ss_family)
 423                         continue;
 424                 if (ss->ss_family == AF_INET) {
 425                         a = (const uint8_t *)
 426                             &((const struct sockaddr_in *)ss)->sin_addr;
 427                         b = (const uint8_t *)
 428                             &((const struct sockaddr_in *)&ap->ap_sa)->sin_addr;
 429                 } else {
 430                         a = (const uint8_t *)
 431                             &((const struct sockaddr_in6 *)ss)->sin6_addr;
 432                         b = (const uint8_t *)
 433                             &((const struct sockaddr_in6 *)&ap->ap_sa)->sin6_addr;
 434                 }
 435                 for (i = 0; i < ap->ap_mask / 8; i++) {
 436                         if (a[i] != b[i])
 437                                 goto next;
 438                 }
 439                 if (ap->ap_mask % 8) {
 440                         bmask = 0xff << (8 - (ap->ap_mask % 8));
 441                         if ((a[i] & bmask) != (b[i] & bmask))
 442                                 goto next;
 443                 }
 444                 return (ap);
 445 next:
 446                 ;
 447         }
 448
 449         return (NULL);
 450 }
 451
 452 int
 453 auth_portal_check(const struct auth_group *ag, const struct sockaddr_storage *sa)
 454 {
 455
 456         if (!auth_portal_defined(ag))
 457                 return (0);
 458
 459         if (auth_portal_find(ag, sa) == NULL)
 460                 return (1);
 461
 462         return (0);
 463 }
 464
 465 struct auth_group *
 466 auth_group_new(struct conf *conf, const char *name)
 467 {
 468         struct auth_group *ag;
 469
 470         if (name != NULL) {
 471                 ag = auth_group_find(conf, name);
 472                 if (ag != NULL) {
 473                         log_warnx("duplicated auth-group \"%s\"", name);
 474                         return (NULL);
 475                 }
 476         }
 477
 478         ag = calloc(1, sizeof(*ag));
 479         if (ag == NULL)
 480                 log_err(1, "calloc");
 481         if (name != NULL)
 482                 ag->ag_name = checked_strdup(name);
 483         TAILQ_INIT(&ag->ag_auths);
 484         TAILQ_INIT(&ag->ag_names);
 485         TAILQ_INIT(&ag->ag_portals);
 486         ag->ag_conf = conf;
 487         TAILQ_INSERT_TAIL(&conf->conf_auth_groups, ag, ag_next);
 488
 489         return (ag);
 490 }
 491
 492 void
 493 auth_group_delete(struct auth_group *ag)
 494 {
 495         struct auth *auth, *auth_tmp;
 496         struct auth_name *auth_name, *auth_name_tmp;
 497         struct auth_portal *auth_portal, *auth_portal_tmp;
 498
 499         TAILQ_REMOVE(&ag->ag_conf->conf_auth_groups, ag, ag_next);
 500
 501         TAILQ_FOREACH_SAFE(auth, &ag->ag_auths, a_next, auth_tmp)
 502                 auth_delete(auth);
 503         TAILQ_FOREACH_SAFE(auth_name, &ag->ag_names, an_next, auth_name_tmp)
 504                 auth_name_delete(auth_name);
 505         TAILQ_FOREACH_SAFE(auth_portal, &ag->ag_portals, ap_next,
 506             auth_portal_tmp)
 507                 auth_portal_delete(auth_portal);
 508         free(ag->ag_name);
 509         free(ag);
 510 }
 511
 512 struct auth_group *
 513 auth_group_find(const struct conf *conf, const char *name)
 514 {
 515         struct auth_group *ag;
 516
 517         TAILQ_FOREACH(ag, &conf->conf_auth_groups, ag_next) {
 518                 if (ag->ag_name != NULL && strcmp(ag->ag_name, name) == 0)
 519                         return (ag);
 520         }
 521
 522         return (NULL);
 523 }
 524
 525 int
 526 auth_group_set_type(struct auth_group *ag, const char *str)
 527 {
 528         int type;
 529
 530         if (strcmp(str, "none") == 0) {
 531                 type = AG_TYPE_NO_AUTHENTICATION;
 532         } else if (strcmp(str, "deny") == 0) {
 533                 type = AG_TYPE_DENY;
 534         } else if (strcmp(str, "chap") == 0) {
 535                 type = AG_TYPE_CHAP;
 536         } else if (strcmp(str, "chap-mutual") == 0) {
 537                 type = AG_TYPE_CHAP_MUTUAL;
 538         } else {
 539                 if (ag->ag_name != NULL)
 540                         log_warnx("invalid auth-type \"%s\" for auth-group "
 541                             "\"%s\"", str, ag->ag_name);
 542                 else
 543                         log_warnx("invalid auth-type \"%s\" for target "
 544                             "\"%s\"", str, ag->ag_target->t_name);
 545                 return (1);
 546         }
 547
 548         if (ag->ag_type != AG_TYPE_UNKNOWN && ag->ag_type != type) {
 549                 if (ag->ag_name != NULL) {
 550                         log_warnx("cannot set auth-type to \"%s\" for "
 551                             "auth-group \"%s\"; already has a different "
 552                             "type", str, ag->ag_name);
 553                 } else {
 554                         log_warnx("cannot set auth-type to \"%s\" for target "
 555                             "\"%s\"; already has a different type",
 556                             str, ag->ag_target->t_name);
 557                 }
 558                 return (1);
 559         }
 560
 561         ag->ag_type = type;
 562
 563         return (0);
 564 }
 565
 566 static struct portal *
 567 portal_new(struct portal_group *pg)
 568 {
 569         struct portal *portal;
 570
 571         portal = calloc(1, sizeof(*portal));
 572         if (portal == NULL)
 573                 log_err(1, "calloc");
 574         TAILQ_INIT(&portal->p_targets);
 575         portal->p_portal_group = pg;
 576         TAILQ_INSERT_TAIL(&pg->pg_portals, portal, p_next);
 577         return (portal);
 578 }
 579
 580 static void
 581 portal_delete(struct portal *portal)
 582 {
 583
 584         TAILQ_REMOVE(&portal->p_portal_group->pg_portals, portal, p_next);
 585         if (portal->p_ai != NULL)
 586                 freeaddrinfo(portal->p_ai);
 587         free(portal->p_listen);
 588         free(portal);
 589 }
 590
 591 struct portal_group *
 592 portal_group_new(struct conf *conf, const char *name)
 593 {
 594         struct portal_group *pg;
 595
 596         pg = portal_group_find(conf, name);
 597         if (pg != NULL) {
 598                 log_warnx("duplicated portal-group \"%s\"", name);
 599                 return (NULL);
 600         }
 601
 602         pg = calloc(1, sizeof(*pg));
 603         if (pg == NULL)
 604                 log_err(1, "calloc");
 605         pg->pg_name = checked_strdup(name);
 606         TAILQ_INIT(&pg->pg_portals);
 607         pg->pg_conf = conf;
 608         conf->conf_last_portal_group_tag++;
 609         pg->pg_tag = conf->conf_last_portal_group_tag;
 610         TAILQ_INSERT_TAIL(&conf->conf_portal_groups, pg, pg_next);
 611
 612         return (pg);
 613 }
 614
 615 void
 616 portal_group_delete(struct portal_group *pg)
 617 {
 618         struct portal *portal, *tmp;
 619
 620         TAILQ_REMOVE(&pg->pg_conf->conf_portal_groups, pg, pg_next);
 621
 622         TAILQ_FOREACH_SAFE(portal, &pg->pg_portals, p_next, tmp)
 623                 portal_delete(portal);
 624         free(pg->pg_name);
 625         free(pg);
 626 }
 627
 628 struct portal_group *
 629 portal_group_find(const struct conf *conf, const char *name)
 630 {
 631         struct portal_group *pg;
 632
 633         TAILQ_FOREACH(pg, &conf->conf_portal_groups, pg_next) {
 634                 if (strcmp(pg->pg_name, name) == 0)
 635                         return (pg);
 636         }
 637
 638         return (NULL);
 639 }
 640
 641 static int
 642 parse_addr_port(char *arg, const char *def_port, struct addrinfo **ai)
 643 {
 644         struct addrinfo hints;
 645         char *addr, *ch;
 646         const char *port;
 647         int error, colons = 0;
 648
 649         if (arg[0] == '[') {
 650                 /*
 651                  * IPv6 address in square brackets, perhaps with port.
 652                  */
 653                 arg++;
 654                 addr = strsep(&arg, "]");
 655                 if (arg == NULL)
 656                         return (1);
 657                 if (arg[0] == '\0') {
 658                         port = def_port;
 659                 } else if (arg[0] == ':') {
 660                         port = arg + 1;
 661                 } else
 662                         return (1);
 663         } else {
 664                 /*
 665                  * Either IPv6 address without brackets - and without
 666                  * a port - or IPv4 address.  Just count the colons.
 667                  */
 668                 for (ch = arg; *ch != '\0'; ch++) {
 669                         if (*ch == ':')
 670                                 colons++;
 671                 }
 672                 if (colons > 1) {
 673                         addr = arg;
 674                         port = def_port;
 675                 } else {
 676                         addr = strsep(&arg, ":");
 677                         if (arg == NULL)
 678                                 port = def_port;
 679                         else
 680                                 port = arg;
 681                 }
 682         }
 683
 684         memset(&hints, 0, sizeof(hints));
 685         hints.ai_family = PF_UNSPEC;
 686         hints.ai_socktype = SOCK_STREAM;
 687         hints.ai_flags = AI_PASSIVE;
 688         error = getaddrinfo(addr, port, &hints, ai);
 689         if (error != 0)
 690                 return (1);
 691         return (0);
 692 }
 693
 694 int
 695 portal_group_add_listen(struct portal_group *pg, const char *value, bool iser)
 696 {
 697         struct portal *portal;
 698
 699         portal = portal_new(pg);
 700         portal->p_listen = checked_strdup(value);
 701         portal->p_iser = iser;
 702
 703         if (parse_addr_port(portal->p_listen, "3260", &portal->p_ai)) {
 704                 log_warnx("invalid listen address %s", portal->p_listen);
 705                 portal_delete(portal);
 706                 return (1);
 707         }
 708
 709         /*
 710          * XXX: getaddrinfo(3) may return multiple addresses; we should turn
 711          *      those into multiple portals.
 712          */
 713
 714         return (0);
 715 }
 716
 717 int
 718 isns_new(struct conf *conf, const char *addr)
 719 {
 720         struct isns *isns;
 721
 722         isns = calloc(1, sizeof(*isns));
 723         if (isns == NULL)
 724                 log_err(1, "calloc");
 725         isns->i_conf = conf;
 726         TAILQ_INSERT_TAIL(&conf->conf_isns, isns, i_next);
 727         isns->i_addr = checked_strdup(addr);
 728
 729         if (parse_addr_port(isns->i_addr, "3205", &isns->i_ai)) {
 730                 log_warnx("invalid iSNS address %s", isns->i_addr);
 731                 isns_delete(isns);
 732                 return (1);
 733         }
 734
 735         /*
 736          * XXX: getaddrinfo(3) may return multiple addresses; we should turn
 737          *      those into multiple servers.
 738          */
 739
 740         return (0);
 741 }
 742
 743 void
 744 isns_delete(struct isns *isns)
 745 {
 746
 747         TAILQ_REMOVE(&isns->i_conf->conf_isns, isns, i_next);
 748         free(isns->i_addr);
 749         if (isns->i_ai != NULL)
 750                 freeaddrinfo(isns->i_ai);
 751         free(isns);
 752 }
 753
 754 static int
 755 isns_do_connect(struct isns *isns)
 756 {
 757         int s;
 758
 759         s = socket(isns->i_ai->ai_family, isns->i_ai->ai_socktype,
 760             isns->i_ai->ai_protocol);
 761         if (s < 0) {
 762                 log_warn("socket(2) failed for %s", isns->i_addr);
 763                 return (-1);
 764         }
 765         if (connect(s, isns->i_ai->ai_addr, isns->i_ai->ai_addrlen)) {
 766                 log_warn("connect(2) failed for %s", isns->i_addr);
 767                 close(s);
 768                 return (-1);
 769         }
 770         return(s);
 771 }
 772
 773 static int
 774 isns_do_register(struct isns *isns, int s, const char *hostname)
 775 {
 776         struct conf *conf = isns->i_conf;
 777         struct target *target;
 778         struct portal *portal;
 779         struct portal_group *pg;
 780         struct isns_req *req;
 781         int res = 0;
 782         uint32_t error;
 783
 784         req = isns_req_create(ISNS_FUNC_DEVATTRREG, ISNS_FLAG_CLIENT);
 785         isns_req_add_str(req, 32, TAILQ_FIRST(&conf->conf_targets)->t_name);
 786         isns_req_add_delim(req);
 787         isns_req_add_str(req, 1, hostname);
 788         isns_req_add_32(req, 2, 2); /* 2 -- iSCSI */
 789         isns_req_add_32(req, 6, conf->conf_isns_period);
 790         TAILQ_FOREACH(pg, &conf->conf_portal_groups, pg_next) {
 791                 if (pg->pg_unassigned)
 792                         continue;
 793                 TAILQ_FOREACH(portal, &pg->pg_portals, p_next) {
 794                         isns_req_add_addr(req, 16, portal->p_ai);
 795                         isns_req_add_port(req, 17, portal->p_ai);
 796                 }
 797         }
 798         TAILQ_FOREACH(target, &conf->conf_targets, t_next) {
 799                 isns_req_add_str(req, 32, target->t_name);
 800                 isns_req_add_32(req, 33, 1); /* 1 -- Target*/
 801                 if (target->t_alias != NULL)
 802                         isns_req_add_str(req, 34, target->t_alias);
 803                 pg = target->t_portal_group;
 804                 isns_req_add_32(req, 51, pg->pg_tag);
 805                 TAILQ_FOREACH(portal, &pg->pg_portals, p_next) {
 806                         isns_req_add_addr(req, 49, portal->p_ai);
 807                         isns_req_add_port(req, 50, portal->p_ai);
 808                 }
 809         }
 810         res = isns_req_send(s, req);
 811         if (res < 0) {
 812                 log_warn("send(2) failed for %s", isns->i_addr);
 813                 goto quit;
 814         }
 815         res = isns_req_receive(s, req);
 816         if (res < 0) {
 817                 log_warn("receive(2) failed for %s", isns->i_addr);
 818                 goto quit;
 819         }
 820         error = isns_req_get_status(req);
 821         if (error != 0) {
 822                 log_warnx("iSNS register error %d for %s", error, isns->i_addr);
 823                 res = -1;
 824         }
 825 quit:
 826         isns_req_free(req);
 827         return (res);
 828 }
 829
 830 static int
 831 isns_do_check(struct isns *isns, int s, const char *hostname)
 832 {
 833         struct conf *conf = isns->i_conf;
 834         struct isns_req *req;
 835         int res = 0;
 836         uint32_t error;
 837
 838         req = isns_req_create(ISNS_FUNC_DEVATTRQRY, ISNS_FLAG_CLIENT);
 839         isns_req_add_str(req, 32, TAILQ_FIRST(&conf->conf_targets)->t_name);
 840         isns_req_add_str(req, 1, hostname);
 841         isns_req_add_delim(req);
 842         isns_req_add(req, 2, 0, NULL);
 843         res = isns_req_send(s, req);
 844         if (res < 0) {
 845                 log_warn("send(2) failed for %s", isns->i_addr);
 846                 goto quit;
 847         }
 848         res = isns_req_receive(s, req);
 849         if (res < 0) {
 850                 log_warn("receive(2) failed for %s", isns->i_addr);
 851                 goto quit;
 852         }
 853         error = isns_req_get_status(req);
 854         if (error != 0) {
 855                 log_warnx("iSNS check error %d for %s", error, isns->i_addr);
 856                 res = -1;
 857         }
 858 quit:
 859         isns_req_free(req);
 860         return (res);
 861 }
 862
 863 static int
 864 isns_do_deregister(struct isns *isns, int s, const char *hostname)
 865 {
 866         struct conf *conf = isns->i_conf;
 867         struct isns_req *req;
 868         int res = 0;
 869         uint32_t error;
 870
 871         req = isns_req_create(ISNS_FUNC_DEVDEREG, ISNS_FLAG_CLIENT);
 872         isns_req_add_str(req, 32, TAILQ_FIRST(&conf->conf_targets)->t_name);
 873         isns_req_add_delim(req);
 874         isns_req_add_str(req, 1, hostname);
 875         res = isns_req_send(s, req);
 876         if (res < 0) {
 877                 log_warn("send(2) failed for %s", isns->i_addr);
 878                 goto quit;
 879         }
 880         res = isns_req_receive(s, req);
 881         if (res < 0) {
 882                 log_warn("receive(2) failed for %s", isns->i_addr);
 883                 goto quit;
 884         }
 885         error = isns_req_get_status(req);
 886         if (error != 0) {
 887                 log_warnx("iSNS deregister error %d for %s", error, isns->i_addr);
 888                 res = -1;
 889         }
 890 quit:
 891         isns_req_free(req);
 892         return (res);
 893 }
 894
 895 void
 896 isns_register(struct isns *isns, struct isns *oldisns)
 897 {
 898         struct conf *conf = isns->i_conf;
 899         int s;
 900         char hostname[256];
 901
 902         if (TAILQ_EMPTY(&conf->conf_targets) ||
 903             TAILQ_EMPTY(&conf->conf_portal_groups))
 904                 return;
 905         set_timeout(conf->conf_isns_timeout, false);
 906         s = isns_do_connect(isns);
 907         if (s < 0) {
 908                 set_timeout(0, false);
 909                 return;
 910         }
 911         gethostname(hostname, sizeof(hostname));
 912
 913         if (oldisns == NULL || TAILQ_EMPTY(&oldisns->i_conf->conf_targets))
 914                 oldisns = isns;
 915         isns_do_deregister(oldisns, s, hostname);
 916         isns_do_register(isns, s, hostname);
 917         close(s);
 918         set_timeout(0, false);
 919 }
 920
 921 void
 922 isns_check(struct isns *isns)
 923 {
 924         struct conf *conf = isns->i_conf;
 925         int s, res;
 926         char hostname[256];
 927
 928         if (TAILQ_EMPTY(&conf->conf_targets) ||
 929             TAILQ_EMPTY(&conf->conf_portal_groups))
 930                 return;
 931         set_timeout(conf->conf_isns_timeout, false);
 932         s = isns_do_connect(isns);
 933         if (s < 0) {
 934                 set_timeout(0, false);
 935                 return;
 936         }
 937         gethostname(hostname, sizeof(hostname));
 938
 939         res = isns_do_check(isns, s, hostname);
 940         if (res < 0) {
 941                 isns_do_deregister(isns, s, hostname);
 942                 isns_do_register(isns, s, hostname);
 943         }
 944         close(s);
 945         set_timeout(0, false);
 946 }
 947
 948 void
 949 isns_deregister(struct isns *isns)
 950 {
 951         struct conf *conf = isns->i_conf;
 952         int s;
 953         char hostname[256];
 954
 955         if (TAILQ_EMPTY(&conf->conf_targets) ||
 956             TAILQ_EMPTY(&conf->conf_portal_groups))
 957                 return;
 958         set_timeout(conf->conf_isns_timeout, false);
 959         s = isns_do_connect(isns);
 960         if (s < 0)
 961                 return;
 962         gethostname(hostname, sizeof(hostname));
 963
 964         isns_do_deregister(isns, s, hostname);
 965         close(s);
 966         set_timeout(0, false);
 967 }
 968
 969 int
 970 portal_group_set_filter(struct portal_group *pg, const char *str)
 971 {
 972         int filter;
 973
 974         if (strcmp(str, "none") == 0) {
 975                 filter = PG_FILTER_NONE;
 976         } else if (strcmp(str, "portal") == 0) {
 977                 filter = PG_FILTER_PORTAL;
 978         } else if (strcmp(str, "portal-name") == 0) {
 979                 filter = PG_FILTER_PORTAL_NAME;
 980         } else if (strcmp(str, "portal-name-auth") == 0) {
 981                 filter = PG_FILTER_PORTAL_NAME_AUTH;
 982         } else {
 983                 log_warnx("invalid discovery-filter \"%s\" for portal-group "
 984                     "\"%s\"; valid values are \"none\", \"portal\", "
 985                     "\"portal-name\", and \"portal-name-auth\"",
 986                     str, pg->pg_name);
 987                 return (1);
 988         }
 989
 990         if (pg->pg_discovery_filter != PG_FILTER_UNKNOWN &&
 991             pg->pg_discovery_filter != filter) {
 992                 log_warnx("cannot set discovery-filter to \"%s\" for "
 993                     "portal-group \"%s\"; already has a different "
 994                     "value", str, pg->pg_name);
 995                 return (1);
 996         }
 997
 998         pg->pg_discovery_filter = filter;
 999
1000         return (0);
1001 }
1002
1003 static bool
1004 valid_hex(const char ch)
1005 {
1006         switch (ch) {
1007         case '0':
1008         case '1':
1009         case '2':
1010         case '3':
1011         case '4':
1012         case '5':
1013         case '6':
1014         case '7':
1015         case '8':
1016         case '9':
1017         case 'a':
1018         case 'A':
1019         case 'b':
1020         case 'B':
1021         case 'c':
1022         case 'C':
1023         case 'd':
1024         case 'D':
1025         case 'e':
1026         case 'E':
1027         case 'f':
1028         case 'F':
1029                 return (true);
1030         default:
1031                 return (false);
1032         }
1033 }
1034
1035 bool
1036 valid_iscsi_name(const char *name)
1037 {
1038         int i;
1039
1040         if (strlen(name) >= MAX_NAME_LEN) {
1041                 log_warnx("overlong name for target \"%s\"; max length allowed "
1042                     "by iSCSI specification is %d characters",
1043                     name, MAX_NAME_LEN);
1044                 return (false);
1045         }
1046
1047         /*
1048          * In the cases below, we don't return an error, just in case the admin
1049          * was right, and we're wrong.
1050          */
1051         if (strncasecmp(name, "iqn.", strlen("iqn.")) == 0) {
1052                 for (i = strlen("iqn."); name[i] != '\0'; i++) {
1053                         /*
1054                          * XXX: We should verify UTF-8 normalisation, as defined
1055                          *      by 3.2.6.2: iSCSI Name Encoding.
1056                          */
1057                         if (isalnum(name[i]))
1058                                 continue;
1059                         if (name[i] == '-' || name[i] == '.' || name[i] == ':')
1060                                 continue;
1061                         log_warnx("invalid character \"%c\" in target name "
1062                             "\"%s\"; allowed characters are letters, digits, "
1063                             "'-', '.', and ':'", name[i], name);
1064                         break;
1065                 }
1066                 /*
1067                  * XXX: Check more stuff: valid date and a valid reversed domain.
1068                  */
1069         } else if (strncasecmp(name, "eui.", strlen("eui.")) == 0) {
1070                 if (strlen(name) != strlen("eui.") + 16)
1071                         log_warnx("invalid target name \"%s\"; the \"eui.\" "
1072                             "should be followed by exactly 16 hexadecimal "
1073                             "digits", name);
1074                 for (i = strlen("eui."); name[i] != '\0'; i++) {
1075                         if (!valid_hex(name[i])) {
1076                                 log_warnx("invalid character \"%c\" in target "
1077                                     "name \"%s\"; allowed characters are 1-9 "
1078                                     "and A-F", name[i], name);
1079                                 break;
1080                         }
1081                 }
1082         } else if (strncasecmp(name, "naa.", strlen("naa.")) == 0) {
1083                 if (strlen(name) > strlen("naa.") + 32)
1084                         log_warnx("invalid target name \"%s\"; the \"naa.\" "
1085                             "should be followed by at most 32 hexadecimal "
1086                             "digits", name);
1087                 for (i = strlen("naa."); name[i] != '\0'; i++) {
1088                         if (!valid_hex(name[i])) {
1089                                 log_warnx("invalid character \"%c\" in target "
1090                                     "name \"%s\"; allowed characters are 1-9 "
1091                                     "and A-F", name[i], name);
1092                                 break;
1093                         }
1094                 }
1095         } else {
1096                 log_warnx("invalid target name \"%s\"; should start with "
1097                     "either \".iqn\", \"eui.\", or \"naa.\"",
1098                     name);
1099         }
1100         return (true);
1101 }
1102
1103 struct target *
1104 target_new(struct conf *conf, const char *name)
1105 {
1106         struct target *targ;
1107         int i, len;
1108
1109         targ = target_find(conf, name);
1110         if (targ != NULL) {
1111                 log_warnx("duplicated target \"%s\"", name);
1112                 return (NULL);
1113         }
1114         if (valid_iscsi_name(name) == false) {
1115                 log_warnx("target name \"%s\" is invalid", name);
1116                 return (NULL);
1117         }
1118         targ = calloc(1, sizeof(*targ));
1119         if (targ == NULL)
1120                 log_err(1, "calloc");
1121         targ->t_name = checked_strdup(name);
1122
1123         /*
1124          * RFC 3722 requires us to normalize the name to lowercase.
1125          */
1126         len = strlen(name);
1127         for (i = 0; i < len; i++)
1128                 targ->t_name[i] = tolower(targ->t_name[i]);
1129
1130         TAILQ_INIT(&targ->t_luns);
1131         targ->t_conf = conf;
1132         TAILQ_INSERT_TAIL(&conf->conf_targets, targ, t_next);
1133
1134         return (targ);
1135 }
1136
1137 void
1138 target_delete(struct target *targ)
1139 {
1140         struct lun *lun, *tmp;
1141
1142         TAILQ_REMOVE(&targ->t_conf->conf_targets, targ, t_next);
1143
1144         TAILQ_FOREACH_SAFE(lun, &targ->t_luns, l_next, tmp)
1145                 lun_delete(lun);
1146         free(targ->t_name);
1147         free(targ);
1148 }
1149
1150 struct target *
1151 target_find(struct conf *conf, const char *name)
1152 {
1153         struct target *targ;
1154
1155         TAILQ_FOREACH(targ, &conf->conf_targets, t_next) {
1156                 if (strcasecmp(targ->t_name, name) == 0)
1157                         return (targ);
1158         }
1159
1160         return (NULL);
1161 }
1162
1163 struct lun *
1164 lun_new(struct target *targ, int lun_id)
1165 {
1166         struct lun *lun;
1167
1168         lun = lun_find(targ, lun_id);
1169         if (lun != NULL) {
1170                 log_warnx("duplicated lun %d for target \"%s\"",
1171                     lun_id, targ->t_name);
1172                 return (NULL);
1173         }
1174
1175         lun = calloc(1, sizeof(*lun));
1176         if (lun == NULL)
1177                 log_err(1, "calloc");
1178         lun->l_lun = lun_id;
1179         TAILQ_INIT(&lun->l_options);
1180         lun->l_target = targ;
1181         TAILQ_INSERT_TAIL(&targ->t_luns, lun, l_next);
1182
1183         return (lun);
1184 }
1185
1186 void
1187 lun_delete(struct lun *lun)
1188 {
1189         struct lun_option *lo, *tmp;
1190
1191         TAILQ_REMOVE(&lun->l_target->t_luns, lun, l_next);
1192
1193         TAILQ_FOREACH_SAFE(lo, &lun->l_options, lo_next, tmp)
1194                 lun_option_delete(lo);
1195         free(lun->l_backend);
1196         free(lun->l_device_id);
1197         free(lun->l_path);
1198         free(lun->l_serial);
1199         free(lun);
1200 }
1201
1202 struct lun *
1203 lun_find(const struct target *targ, int lun_id)
1204 {
1205         struct lun *lun;
1206
1207         TAILQ_FOREACH(lun, &targ->t_luns, l_next) {
1208                 if (lun->l_lun == lun_id)
1209                         return (lun);
1210         }
1211
1212         return (NULL);
1213 }
1214
1215 void
1216 lun_set_backend(struct lun *lun, const char *value)
1217 {
1218         free(lun->l_backend);
1219         lun->l_backend = checked_strdup(value);
1220 }
1221
1222 void
1223 lun_set_blocksize(struct lun *lun, size_t value)
1224 {
1225
1226         lun->l_blocksize = value;
1227 }
1228
1229 void
1230 lun_set_device_id(struct lun *lun, const char *value)
1231 {
1232         free(lun->l_device_id);
1233         lun->l_device_id = checked_strdup(value);
1234 }
1235
1236 void
1237 lun_set_path(struct lun *lun, const char *value)
1238 {
1239         free(lun->l_path);
1240         lun->l_path = checked_strdup(value);
1241 }
1242
1243 void
1244 lun_set_serial(struct lun *lun, const char *value)
1245 {
1246         free(lun->l_serial);
1247         lun->l_serial = checked_strdup(value);
1248 }
1249
1250 void
1251 lun_set_size(struct lun *lun, size_t value)
1252 {
1253
1254         lun->l_size = value;
1255 }
1256
1257 void
1258 lun_set_ctl_lun(struct lun *lun, uint32_t value)
1259 {
1260
1261         lun->l_ctl_lun = value;
1262 }
1263
1264 struct lun_option *
1265 lun_option_new(struct lun *lun, const char *name, const char *value)
1266 {
1267         struct lun_option *lo;
1268
1269         lo = lun_option_find(lun, name);
1270         if (lo != NULL) {
1271                 log_warnx("duplicated lun option %s for lun %d, target \"%s\"",
1272                     name, lun->l_lun, lun->l_target->t_name);
1273                 return (NULL);
1274         }
1275
1276         lo = calloc(1, sizeof(*lo));
1277         if (lo == NULL)
1278                 log_err(1, "calloc");
1279         lo->lo_name = checked_strdup(name);
1280         lo->lo_value = checked_strdup(value);
1281         lo->lo_lun = lun;
1282         TAILQ_INSERT_TAIL(&lun->l_options, lo, lo_next);
1283
1284         return (lo);
1285 }
1286
1287 void
1288 lun_option_delete(struct lun_option *lo)
1289 {
1290
1291         TAILQ_REMOVE(&lo->lo_lun->l_options, lo, lo_next);
1292
1293         free(lo->lo_name);
1294         free(lo->lo_value);
1295         free(lo);
1296 }
1297
1298 struct lun_option *
1299 lun_option_find(const struct lun *lun, const char *name)
1300 {
1301         struct lun_option *lo;
1302
1303         TAILQ_FOREACH(lo, &lun->l_options, lo_next) {
1304                 if (strcmp(lo->lo_name, name) == 0)
1305                         return (lo);
1306         }
1307
1308         return (NULL);
1309 }
1310
1311 void
1312 lun_option_set(struct lun_option *lo, const char *value)
1313 {
1314
1315         free(lo->lo_value);
1316         lo->lo_value = checked_strdup(value);
1317 }
1318
1319 static struct connection *
1320 connection_new(struct portal *portal, int fd, const char *host,
1321     const struct sockaddr *client_sa)
1322 {
1323         struct connection *conn;
1324
1325         conn = calloc(1, sizeof(*conn));
1326         if (conn == NULL)
1327                 log_err(1, "calloc");
1328         conn->conn_portal = portal;
1329         conn->conn_socket = fd;
1330         conn->conn_initiator_addr = checked_strdup(host);
1331         memcpy(&conn->conn_initiator_sa, client_sa, client_sa->sa_len);
1332
1333         /*
1334          * Default values, from RFC 3720, section 12.
1335          */
1336         conn->conn_max_data_segment_length = 8192;
1337         conn->conn_max_burst_length = 262144;
1338         conn->conn_immediate_data = true;
1339
1340         return (conn);
1341 }
1342
1343 #if 0
1344 static void
1345 conf_print(struct conf *conf)
1346 {
1347         struct auth_group *ag;
1348         struct auth *auth;
1349         struct auth_name *auth_name;
1350         struct auth_portal *auth_portal;
1351         struct portal_group *pg;
1352         struct portal *portal;
1353         struct target *targ;
1354         struct lun *lun;
1355         struct lun_option *lo;
1356
1357         TAILQ_FOREACH(ag, &conf->conf_auth_groups, ag_next) {
1358                 fprintf(stderr, "auth-group %s {\n", ag->ag_name);
1359                 TAILQ_FOREACH(auth, &ag->ag_auths, a_next)
1360                         fprintf(stderr, "\t chap-mutual %s %s %s %s\n",
1361                             auth->a_user, auth->a_secret,
1362                             auth->a_mutual_user, auth->a_mutual_secret);
1363                 TAILQ_FOREACH(auth_name, &ag->ag_names, an_next)
1364                         fprintf(stderr, "\t initiator-name %s\n",
1365                             auth_name->an_initator_name);
1366                 TAILQ_FOREACH(auth_portal, &ag->ag_portals, an_next)
1367                         fprintf(stderr, "\t initiator-portal %s\n",
1368                             auth_portal->an_initator_portal);
1369                 fprintf(stderr, "}\n");
1370         }
1371         TAILQ_FOREACH(pg, &conf->conf_portal_groups, pg_next) {
1372                 fprintf(stderr, "portal-group %s {\n", pg->pg_name);
1373                 TAILQ_FOREACH(portal, &pg->pg_portals, p_next)
1374                         fprintf(stderr, "\t listen %s\n", portal->p_listen);
1375                 fprintf(stderr, "}\n");
1376         }
1377         TAILQ_FOREACH(targ, &conf->conf_targets, t_next) {
1378                 fprintf(stderr, "target %s {\n", targ->t_name);
1379                 if (targ->t_alias != NULL)
1380                         fprintf(stderr, "\t alias %s\n", targ->t_alias);
1381                 TAILQ_FOREACH(lun, &targ->t_luns, l_next) {
1382                         fprintf(stderr, "\tlun %d {\n", lun->l_lun);
1383                         fprintf(stderr, "\t\tpath %s\n", lun->l_path);
1384                         TAILQ_FOREACH(lo, &lun->l_options, lo_next)
1385                                 fprintf(stderr, "\t\toption %s %s\n",
1386                                     lo->lo_name, lo->lo_value);
1387                         fprintf(stderr, "\t}\n");
1388                 }
1389                 fprintf(stderr, "}\n");
1390         }
1391 }
1392 #endif
1393
1394 static int
1395 conf_verify_lun(struct lun *lun)
1396 {
1397         const struct lun *lun2;
1398         const struct target *targ2;
1399
1400         if (lun->l_backend == NULL)
1401                 lun_set_backend(lun, "block");
1402         if (strcmp(lun->l_backend, "block") == 0) {
1403                 if (lun->l_path == NULL) {
1404                         log_warnx("missing path for lun %d, target \"%s\"",
1405                             lun->l_lun, lun->l_target->t_name);
1406                         return (1);
1407                 }
1408         } else if (strcmp(lun->l_backend, "ramdisk") == 0) {
1409                 if (lun->l_size == 0) {
1410                         log_warnx("missing size for ramdisk-backed lun %d, "
1411                             "target \"%s\"", lun->l_lun, lun->l_target->t_name);
1412                         return (1);
1413                 }
1414                 if (lun->l_path != NULL) {
1415                         log_warnx("path must not be specified "
1416                             "for ramdisk-backed lun %d, target \"%s\"",
1417                             lun->l_lun, lun->l_target->t_name);
1418                         return (1);
1419                 }
1420         }
1421         if (lun->l_lun < 0 || lun->l_lun > 255) {
1422                 log_warnx("invalid lun number for lun %d, target \"%s\"; "
1423                     "must be between 0 and 255", lun->l_lun,
1424                     lun->l_target->t_name);
1425                 return (1);
1426         }
1427         if (lun->l_blocksize == 0) {
1428                 lun_set_blocksize(lun, DEFAULT_BLOCKSIZE);
1429         } else if (lun->l_blocksize < 0) {
1430                 log_warnx("invalid blocksize for lun %d, target \"%s\"; "
1431                     "must be larger than 0", lun->l_lun, lun->l_target->t_name);
1432                 return (1);
1433         }
1434         if (lun->l_size != 0 && lun->l_size % lun->l_blocksize != 0) {
1435                 log_warnx("invalid size for lun %d, target \"%s\"; "
1436                     "must be multiple of blocksize", lun->l_lun,
1437                     lun->l_target->t_name);
1438                 return (1);
1439         }
1440         TAILQ_FOREACH(targ2, &lun->l_target->t_conf->conf_targets, t_next) {
1441                 TAILQ_FOREACH(lun2, &targ2->t_luns, l_next) {
1442                         if (lun == lun2)
1443                                 continue;
1444                         if (lun->l_path != NULL && lun2->l_path != NULL &&
1445                             strcmp(lun->l_path, lun2->l_path) == 0) {
1446                                 log_debugx("WARNING: path \"%s\" duplicated "
1447                                     "between lun %d, target \"%s\", and "
1448                                     "lun %d, target \"%s\"", lun->l_path,
1449                                     lun->l_lun, lun->l_target->t_name,
1450                                     lun2->l_lun, lun2->l_target->t_name);
1451                         }
1452                 }
1453         }
1454
1455         return (0);
1456 }
1457
1458 int
1459 conf_verify(struct conf *conf)
1460 {
1461         struct auth_group *ag;
1462         struct portal_group *pg;
1463         struct target *targ;
1464         struct lun *lun;
1465         bool found;
1466         int error;
1467
1468         if (conf->conf_pidfile_path == NULL)
1469                 conf->conf_pidfile_path = checked_strdup(DEFAULT_PIDFILE);
1470
1471         TAILQ_FOREACH(targ, &conf->conf_targets, t_next) {
1472                 if (targ->t_auth_group == NULL) {
1473                         targ->t_auth_group = auth_group_find(conf,
1474                             "default");
1475                         assert(targ->t_auth_group != NULL);
1476                 }
1477                 if (targ->t_portal_group == NULL) {
1478                         targ->t_portal_group = portal_group_find(conf,
1479                             "default");
1480                         assert(targ->t_portal_group != NULL);
1481                 }
1482                 found = false;
1483                 TAILQ_FOREACH(lun, &targ->t_luns, l_next) {
1484                         error = conf_verify_lun(lun);
1485                         if (error != 0)
1486                                 return (error);
1487                         found = true;
1488                 }
1489                 if (!found) {
1490                         log_warnx("no LUNs defined for target \"%s\"",
1491                             targ->t_name);
1492                 }
1493         }
1494         TAILQ_FOREACH(pg, &conf->conf_portal_groups, pg_next) {
1495                 assert(pg->pg_name != NULL);
1496                 if (pg->pg_discovery_auth_group == NULL) {
1497                         pg->pg_discovery_auth_group =
1498                             auth_group_find(conf, "default");
1499                         assert(pg->pg_discovery_auth_group != NULL);
1500                 }
1501
1502                 if (pg->pg_discovery_filter == PG_FILTER_UNKNOWN)
1503                         pg->pg_discovery_filter = PG_FILTER_NONE;
1504
1505                 TAILQ_FOREACH(targ, &conf->conf_targets, t_next) {
1506                         if (targ->t_portal_group == pg)
1507                                 break;
1508                 }
1509                 if (targ == NULL) {
1510                         if (strcmp(pg->pg_name, "default") != 0)
1511                                 log_warnx("portal-group \"%s\" not assigned "
1512                                     "to any target", pg->pg_name);
1513                         pg->pg_unassigned = true;
1514                 } else
1515                         pg->pg_unassigned = false;
1516         }
1517         TAILQ_FOREACH(ag, &conf->conf_auth_groups, ag_next) {
1518                 if (ag->ag_name == NULL)
1519                         assert(ag->ag_target != NULL);
1520                 else
1521                         assert(ag->ag_target == NULL);
1522
1523                 found = false;
1524                 TAILQ_FOREACH(targ, &conf->conf_targets, t_next) {
1525                         if (targ->t_auth_group == ag) {
1526                                 found = true;
1527                                 break;
1528                         }
1529                 }
1530                 TAILQ_FOREACH(pg, &conf->conf_portal_groups, pg_next) {
1531                         if (pg->pg_discovery_auth_group == ag) {
1532                                 found = true;
1533                                 break;
1534                         }
1535                 }
1536                 if (!found && ag->ag_name != NULL &&
1537                     strcmp(ag->ag_name, "default") != 0 &&
1538                     strcmp(ag->ag_name, "no-authentication") != 0 &&
1539                     strcmp(ag->ag_name, "no-access") != 0) {
1540                         log_warnx("auth-group \"%s\" not assigned "
1541                             "to any target", ag->ag_name);
1542                 }
1543         }
1544
1545         return (0);
1546 }
1547
1548 static int
1549 conf_apply(struct conf *oldconf, struct conf *newconf)
1550 {
1551         struct target *oldtarg, *newtarg, *tmptarg;
1552         struct lun *oldlun, *newlun, *tmplun;
1553         struct portal_group *oldpg, *newpg;
1554         struct portal *oldp, *newp;
1555         struct isns *oldns, *newns;
1556         pid_t otherpid;
1557         int changed, cumulated_error = 0, error;
1558         int one = 1;
1559
1560         if (oldconf->conf_debug != newconf->conf_debug) {
1561                 log_debugx("changing debug level to %d", newconf->conf_debug);
1562                 log_init(newconf->conf_debug);
1563         }
1564
1565         if (oldconf->conf_pidfh != NULL) {
1566                 assert(oldconf->conf_pidfile_path != NULL);
1567                 if (newconf->conf_pidfile_path != NULL &&
1568                     strcmp(oldconf->conf_pidfile_path,
1569                     newconf->conf_pidfile_path) == 0) {
1570                         newconf->conf_pidfh = oldconf->conf_pidfh;
1571                         oldconf->conf_pidfh = NULL;
1572                 } else {
1573                         log_debugx("removing pidfile %s",
1574                             oldconf->conf_pidfile_path);
1575                         pidfile_remove(oldconf->conf_pidfh);
1576                         oldconf->conf_pidfh = NULL;
1577                 }
1578         }
1579
1580         if (newconf->conf_pidfh == NULL && newconf->conf_pidfile_path != NULL) {
1581                 log_debugx("opening pidfile %s", newconf->conf_pidfile_path);
1582                 newconf->conf_pidfh =
1583                     pidfile_open(newconf->conf_pidfile_path, 0600, &otherpid);
1584                 if (newconf->conf_pidfh == NULL) {
1585                         if (errno == EEXIST)
1586                                 log_errx(1, "daemon already running, pid: %jd.",
1587                                     (intmax_t)otherpid);
1588                         log_err(1, "cannot open or create pidfile \"%s\"",
1589                             newconf->conf_pidfile_path);
1590                 }
1591         }
1592
1593         /* Deregister on removed iSNS servers. */
1594         TAILQ_FOREACH(oldns, &oldconf->conf_isns, i_next) {
1595                 TAILQ_FOREACH(newns, &newconf->conf_isns, i_next) {
1596                         if (strcmp(oldns->i_addr, newns->i_addr) == 0)
1597                                 break;
1598                 }
1599                 if (newns == NULL)
1600                         isns_deregister(oldns);
1601         }
1602
1603         /*
1604          * XXX: If target or lun removal fails, we should somehow "move"
1605          *      the old lun or target into newconf, so that subsequent
1606          *      conf_apply() would try to remove them again.  That would
1607          *      be somewhat hairy, though, and lun deletion failures don't
1608          *      really happen, so leave it as it is for now.
1609          */
1610         TAILQ_FOREACH_SAFE(oldtarg, &oldconf->conf_targets, t_next, tmptarg) {
1611                 /*
1612                  * First, remove any targets present in the old configuration
1613                  * and missing in the new one.
1614                  */
1615                 newtarg = target_find(newconf, oldtarg->t_name);
1616                 if (newtarg == NULL) {
1617                         TAILQ_FOREACH_SAFE(oldlun, &oldtarg->t_luns, l_next,
1618                             tmplun) {
1619                                 log_debugx("target %s not found in new "
1620                                     "configuration; removing its lun %d, "
1621                                     "backed by CTL lun %d",
1622                                     oldtarg->t_name, oldlun->l_lun,
1623                                     oldlun->l_ctl_lun);
1624                                 error = kernel_lun_remove(oldlun);
1625                                 if (error != 0) {
1626                                         log_warnx("failed to remove lun %d, "
1627                                             "target %s, CTL lun %d",
1628                                             oldlun->l_lun, oldtarg->t_name,
1629                                             oldlun->l_ctl_lun);
1630                                         cumulated_error++;
1631                                 }
1632                         }
1633                         kernel_port_remove(oldtarg);
1634                         continue;
1635                 }
1636
1637                 /*
1638                  * Second, remove any LUNs present in the old target
1639                  * and missing in the new one.
1640                  */
1641                 TAILQ_FOREACH_SAFE(oldlun, &oldtarg->t_luns, l_next, tmplun) {
1642                         newlun = lun_find(newtarg, oldlun->l_lun);
1643                         if (newlun == NULL) {
1644                                 log_debugx("lun %d, target %s, CTL lun %d "
1645                                     "not found in new configuration; "
1646                                     "removing", oldlun->l_lun, oldtarg->t_name,
1647                                     oldlun->l_ctl_lun);
1648                                 error = kernel_lun_remove(oldlun);
1649                                 if (error != 0) {
1650                                         log_warnx("failed to remove lun %d, "
1651                                             "target %s, CTL lun %d",
1652                                             oldlun->l_lun, oldtarg->t_name,
1653                                             oldlun->l_ctl_lun);
1654                                         cumulated_error++;
1655                                 }
1656                                 continue;
1657                         }
1658
1659                         /*
1660                          * Also remove the LUNs changed by more than size.
1661                          */
1662                         changed = 0;
1663                         assert(oldlun->l_backend != NULL);
1664                         assert(newlun->l_backend != NULL);
1665                         if (strcmp(newlun->l_backend, oldlun->l_backend) != 0) {
1666                                 log_debugx("backend for lun %d, target %s, "
1667                                     "CTL lun %d changed; removing",
1668                                     oldlun->l_lun, oldtarg->t_name,
1669                                     oldlun->l_ctl_lun);
1670                                 changed = 1;
1671                         }
1672                         if (oldlun->l_blocksize != newlun->l_blocksize) {
1673                                 log_debugx("blocksize for lun %d, target %s, "
1674                                     "CTL lun %d changed; removing",
1675                                     oldlun->l_lun, oldtarg->t_name,
1676                                     oldlun->l_ctl_lun);
1677                                 changed = 1;
1678                         }
1679                         if (newlun->l_device_id != NULL &&
1680                             (oldlun->l_device_id == NULL ||
1681                              strcmp(oldlun->l_device_id, newlun->l_device_id) !=
1682                              0)) {
1683                                 log_debugx("device-id for lun %d, target %s, "
1684                                     "CTL lun %d changed; removing",
1685                                     oldlun->l_lun, oldtarg->t_name,
1686                                     oldlun->l_ctl_lun);
1687                                 changed = 1;
1688                         }
1689                         if (newlun->l_path != NULL &&
1690                             (oldlun->l_path == NULL ||
1691                              strcmp(oldlun->l_path, newlun->l_path) != 0)) {
1692                                 log_debugx("path for lun %d, target %s, "
1693                                     "CTL lun %d, changed; removing",
1694                                     oldlun->l_lun, oldtarg->t_name,
1695                                     oldlun->l_ctl_lun);
1696                                 changed = 1;
1697                         }
1698                         if (newlun->l_serial != NULL &&
1699                             (oldlun->l_serial == NULL ||
1700                              strcmp(oldlun->l_serial, newlun->l_serial) != 0)) {
1701                                 log_debugx("serial for lun %d, target %s, "
1702                                     "CTL lun %d changed; removing",
1703                                     oldlun->l_lun, oldtarg->t_name,
1704                                     oldlun->l_ctl_lun);
1705                                 changed = 1;
1706                         }
1707                         if (changed) {
1708                                 error = kernel_lun_remove(oldlun);
1709                                 if (error != 0) {
1710                                         log_warnx("failed to remove lun %d, "
1711                                             "target %s, CTL lun %d",
1712                                             oldlun->l_lun, oldtarg->t_name,
1713                                             oldlun->l_ctl_lun);
1714                                         cumulated_error++;
1715                                 }
1716                                 lun_delete(oldlun);
1717                                 continue;
1718                         }
1719
1720                         lun_set_ctl_lun(newlun, oldlun->l_ctl_lun);
1721                 }
1722         }
1723
1724         /*
1725          * Now add new targets or modify existing ones.
1726          */
1727         TAILQ_FOREACH(newtarg, &newconf->conf_targets, t_next) {
1728                 oldtarg = target_find(oldconf, newtarg->t_name);
1729
1730                 TAILQ_FOREACH_SAFE(newlun, &newtarg->t_luns, l_next, tmplun) {
1731                         if (oldtarg != NULL) {
1732                                 oldlun = lun_find(oldtarg, newlun->l_lun);
1733                                 if (oldlun != NULL) {
1734                                         if (newlun->l_size != oldlun->l_size ||
1735                                             newlun->l_size == 0) {
1736                                                 log_debugx("resizing lun %d, "
1737                                                     "target %s, CTL lun %d",
1738                                                     newlun->l_lun,
1739                                                     newtarg->t_name,
1740                                                     newlun->l_ctl_lun);
1741                                                 error =
1742                                                     kernel_lun_resize(newlun);
1743                                                 if (error != 0) {
1744                                                         log_warnx("failed to "
1745                                                             "resize lun %d, "
1746                                                             "target %s, "
1747                                                             "CTL lun %d",
1748                                                             newlun->l_lun,
1749                                                             newtarg->t_name,
1750                                                             newlun->l_lun);
1751                                                         cumulated_error++;
1752                                                 }
1753                                         }
1754                                         continue;
1755                                 }
1756                         }
1757                         log_debugx("adding lun %d, target %s",
1758                             newlun->l_lun, newtarg->t_name);
1759                         error = kernel_lun_add(newlun);
1760                         if (error != 0) {
1761                                 log_warnx("failed to add lun %d, target %s",
1762                                     newlun->l_lun, newtarg->t_name);
1763                                 lun_delete(newlun);
1764                                 cumulated_error++;
1765                         }
1766                 }
1767                 if (oldtarg == NULL)
1768                         kernel_port_add(newtarg);
1769         }
1770
1771         /*
1772          * Go through the new portals, opening the sockets as neccessary.
1773          */
1774         TAILQ_FOREACH(newpg, &newconf->conf_portal_groups, pg_next) {
1775                 if (newpg->pg_unassigned) {
1776                         log_debugx("not listening on portal-group \"%s\", "
1777                             "not assigned to any target",
1778                             newpg->pg_name);
1779                         continue;
1780                 }
1781                 TAILQ_FOREACH(newp, &newpg->pg_portals, p_next) {
1782                         /*
1783                          * Try to find already open portal and reuse
1784                          * the listening socket.  We don't care about
1785                          * what portal or portal group that was, what
1786                          * matters is the listening address.
1787                          */
1788                         TAILQ_FOREACH(oldpg, &oldconf->conf_portal_groups,
1789                             pg_next) {
1790                                 TAILQ_FOREACH(oldp, &oldpg->pg_portals,
1791                                     p_next) {
1792                                         if (strcmp(newp->p_listen,
1793                                             oldp->p_listen) == 0 &&
1794                                             oldp->p_socket > 0) {
1795                                                 newp->p_socket =
1796                                                     oldp->p_socket;
1797                                                 oldp->p_socket = 0;
1798                                                 break;
1799                                         }
1800                                 }
1801                         }
1802                         if (newp->p_socket > 0) {
1803                                 /*
1804                                  * We're done with this portal.
1805                                  */
1806                                 continue;
1807                         }
1808
1809 #ifdef ICL_KERNEL_PROXY
1810                         if (proxy_mode) {
1811                                 newpg->pg_conf->conf_portal_id++;
1812                                 newp->p_id = newpg->pg_conf->conf_portal_id;
1813                                 log_debugx("listening on %s, portal-group "
1814                                     "\"%s\", portal id %d, using ICL proxy",
1815                                     newp->p_listen, newpg->pg_name, newp->p_id);
1816                                 kernel_listen(newp->p_ai, newp->p_iser,
1817                                     newp->p_id);
1818                                 continue;
1819                         }
1820 #endif
1821                         assert(proxy_mode == false);
1822                         assert(newp->p_iser == false);
1823
1824                         log_debugx("listening on %s, portal-group \"%s\"",
1825                             newp->p_listen, newpg->pg_name);
1826                         newp->p_socket = socket(newp->p_ai->ai_family,
1827                             newp->p_ai->ai_socktype,
1828                             newp->p_ai->ai_protocol);
1829                         if (newp->p_socket < 0) {
1830                                 log_warn("socket(2) failed for %s",
1831                                     newp->p_listen);
1832                                 cumulated_error++;
1833                                 continue;
1834                         }
1835                         error = setsockopt(newp->p_socket, SOL_SOCKET,
1836                             SO_REUSEADDR, &one, sizeof(one));
1837                         if (error != 0) {
1838                                 log_warn("setsockopt(SO_REUSEADDR) failed "
1839                                     "for %s", newp->p_listen);
1840                                 close(newp->p_socket);
1841                                 newp->p_socket = 0;
1842                                 cumulated_error++;
1843                                 continue;
1844                         }
1845                         error = bind(newp->p_socket, newp->p_ai->ai_addr,
1846                             newp->p_ai->ai_addrlen);
1847                         if (error != 0) {
1848                                 log_warn("bind(2) failed for %s",
1849                                     newp->p_listen);
1850                                 close(newp->p_socket);
1851                                 newp->p_socket = 0;
1852                                 cumulated_error++;
1853                                 continue;
1854                         }
1855                         error = listen(newp->p_socket, -1);
1856                         if (error != 0) {
1857                                 log_warn("listen(2) failed for %s",
1858                                     newp->p_listen);
1859                                 close(newp->p_socket);
1860                                 newp->p_socket = 0;
1861                                 cumulated_error++;
1862                                 continue;
1863                         }
1864                 }
1865         }
1866
1867         /*
1868          * Go through the no longer used sockets, closing them.
1869          */
1870         TAILQ_FOREACH(oldpg, &oldconf->conf_portal_groups, pg_next) {
1871                 TAILQ_FOREACH(oldp, &oldpg->pg_portals, p_next) {
1872                         if (oldp->p_socket <= 0)
1873                                 continue;
1874                         log_debugx("closing socket for %s, portal-group \"%s\"",
1875                             oldp->p_listen, oldpg->pg_name);
1876                         close(oldp->p_socket);
1877                         oldp->p_socket = 0;
1878                 }
1879         }
1880
1881         /* (Re-)Register on remaining/new iSNS servers. */
1882         TAILQ_FOREACH(newns, &newconf->conf_isns, i_next) {
1883                 TAILQ_FOREACH(oldns, &oldconf->conf_isns, i_next) {
1884                         if (strcmp(oldns->i_addr, newns->i_addr) == 0)
1885                                 break;
1886                 }
1887                 isns_register(newns, oldns);
1888         }
1889
1890         /* Schedule iSNS update */
1891         if (!TAILQ_EMPTY(&newconf->conf_isns))
1892                 set_timeout((newconf->conf_isns_period + 2) / 3, false);
1893
1894         return (cumulated_error);
1895 }
1896
1897 bool
1898 timed_out(void)
1899 {
1900
1901         return (sigalrm_received);
1902 }
1903
1904 static void
1905 sigalrm_handler_fatal(int dummy __unused)
1906 {
1907         /*
1908          * It would be easiest to just log an error and exit.  We can't
1909          * do this, though, because log_errx() is not signal safe, since
1910          * it calls syslog(3).  Instead, set a flag checked by pdu_send()
1911          * and pdu_receive(), to call log_errx() there.  Should they fail
1912          * to notice, we'll exit here one second later.
1913          */
1914         if (sigalrm_received) {
1915                 /*
1916                  * Oh well.  Just give up and quit.
1917                  */
1918                 _exit(2);
1919         }
1920
1921         sigalrm_received = true;
1922 }
1923
1924 static void
1925 sigalrm_handler(int dummy __unused)
1926 {
1927
1928         sigalrm_received = true;
1929 }
1930
1931 void
1932 set_timeout(int timeout, int fatal)
1933 {
1934         struct sigaction sa;
1935         struct itimerval itv;
1936         int error;
1937
1938         if (timeout <= 0) {
1939                 log_debugx("session timeout disabled");
1940                 bzero(&itv, sizeof(itv));
1941                 error = setitimer(ITIMER_REAL, &itv, NULL);
1942                 if (error != 0)
1943                         log_err(1, "setitimer");
1944                 sigalrm_received = false;
1945                 return;
1946         }
1947
1948         sigalrm_received = false;
1949         bzero(&sa, sizeof(sa));
1950         if (fatal)
1951                 sa.sa_handler = sigalrm_handler_fatal;
1952         else
1953                 sa.sa_handler = sigalrm_handler;
1954         sigfillset(&sa.sa_mask);
1955         error = sigaction(SIGALRM, &sa, NULL);
1956         if (error != 0)
1957                 log_err(1, "sigaction");
1958
1959         /*
1960          * First SIGALRM will arive after conf_timeout seconds.
1961          * If we do nothing, another one will arrive a second later.
1962          */
1963         log_debugx("setting session timeout to %d seconds", timeout);
1964         bzero(&itv, sizeof(itv));
1965         itv.it_interval.tv_sec = 1;
1966         itv.it_value.tv_sec = timeout;
1967         error = setitimer(ITIMER_REAL, &itv, NULL);
1968         if (error != 0)
1969                 log_err(1, "setitimer");
1970 }
1971
1972 static int
1973 wait_for_children(bool block)
1974 {
1975         pid_t pid;
1976         int status;
1977         int num = 0;
1978
1979         for (;;) {
1980                 /*
1981                  * If "block" is true, wait for at least one process.
1982                  */
1983                 if (block && num == 0)
1984                         pid = wait4(-1, &status, 0, NULL);
1985                 else
1986                         pid = wait4(-1, &status, WNOHANG, NULL);
1987                 if (pid <= 0)
1988                         break;
1989                 if (WIFSIGNALED(status)) {
1990                         log_warnx("child process %d terminated with signal %d",
1991                             pid, WTERMSIG(status));
1992                 } else if (WEXITSTATUS(status) != 0) {
1993                         log_warnx("child process %d terminated with exit status %d",
1994                             pid, WEXITSTATUS(status));
1995                 } else {
1996                         log_debugx("child process %d terminated gracefully", pid);
1997                 }
1998                 num++;
1999         }
2000
2001         return (num);
2002 }
2003
2004 static void
2005 handle_connection(struct portal *portal, int fd,
2006     const struct sockaddr *client_sa, bool dont_fork)
2007 {
2008         struct connection *conn;
2009         int error;
2010         pid_t pid;
2011         char host[NI_MAXHOST + 1];
2012         struct conf *conf;
2013
2014         conf = portal->p_portal_group->pg_conf;
2015
2016         if (dont_fork) {
2017                 log_debugx("incoming connection; not forking due to -d flag");
2018         } else {
2019                 nchildren -= wait_for_children(false);
2020                 assert(nchildren >= 0);
2021
2022                 while (conf->conf_maxproc > 0 && nchildren >= conf->conf_maxproc) {
2023                         log_debugx("maxproc limit of %d child processes hit; "
2024                             "waiting for child process to exit", conf->conf_maxproc);
2025                         nchildren -= wait_for_children(true);
2026                         assert(nchildren >= 0);
2027                 }
2028                 log_debugx("incoming connection; forking child process #%d",
2029                     nchildren);
2030                 nchildren++;
2031                 pid = fork();
2032                 if (pid < 0)
2033                         log_err(1, "fork");
2034                 if (pid > 0) {
2035                         close(fd);
2036                         return;
2037                 }
2038         }
2039         pidfile_close(conf->conf_pidfh);
2040
2041         error = getnameinfo(client_sa, client_sa->sa_len,
2042             host, sizeof(host), NULL, 0, NI_NUMERICHOST);
2043         if (error != 0)
2044                 log_errx(1, "getnameinfo: %s", gai_strerror(error));
2045
2046         log_debugx("accepted connection from %s; portal group \"%s\"",
2047             host, portal->p_portal_group->pg_name);
2048         log_set_peer_addr(host);
2049         setproctitle("%s", host);
2050
2051         conn = connection_new(portal, fd, host, client_sa);
2052         set_timeout(conf->conf_timeout, true);
2053         kernel_capsicate();
2054         login(conn);
2055         if (conn->conn_session_type == CONN_SESSION_TYPE_NORMAL) {
2056                 kernel_handoff(conn);
2057                 log_debugx("connection handed off to the kernel");
2058         } else {
2059                 assert(conn->conn_session_type == CONN_SESSION_TYPE_DISCOVERY);
2060                 discovery(conn);
2061         }
2062         log_debugx("nothing more to do; exiting");
2063         exit(0);
2064 }
2065
2066 static int
2067 fd_add(int fd, fd_set *fdset, int nfds)
2068 {
2069
2070         /*
2071          * Skip sockets which we failed to bind.
2072          */
2073         if (fd <= 0)
2074                 return (nfds);
2075
2076         FD_SET(fd, fdset);
2077         if (fd > nfds)
2078                 nfds = fd;
2079         return (nfds);
2080 }
2081
2082 static void
2083 main_loop(struct conf *conf, bool dont_fork)
2084 {
2085         struct portal_group *pg;
2086         struct portal *portal;
2087         struct sockaddr_storage client_sa;
2088         socklen_t client_salen;
2089 #ifdef ICL_KERNEL_PROXY
2090         int connection_id;
2091         int portal_id;
2092 #endif
2093         fd_set fdset;
2094         int error, nfds, client_fd;
2095
2096         pidfile_write(conf->conf_pidfh);
2097
2098         for (;;) {
2099                 if (sighup_received || sigterm_received || timed_out())
2100                         return;
2101
2102 #ifdef ICL_KERNEL_PROXY
2103                 if (proxy_mode) {
2104                         client_salen = sizeof(client_sa);
2105                         kernel_accept(&connection_id, &portal_id,
2106                             (struct sockaddr *)&client_sa, &client_salen);
2107                         assert(client_salen >= client_sa.ss_len);
2108
2109                         log_debugx("incoming connection, id %d, portal id %d",
2110                             connection_id, portal_id);
2111                         TAILQ_FOREACH(pg, &conf->conf_portal_groups, pg_next) {
2112                                 TAILQ_FOREACH(portal, &pg->pg_portals, p_next) {
2113                                         if (portal->p_id == portal_id) {
2114                                                 goto found;
2115                                         }
2116                                 }
2117                         }
2118
2119                         log_errx(1, "kernel returned invalid portal_id %d",
2120                             portal_id);
2121
2122 found:
2123                         handle_connection(portal, connection_id,
2124                             (struct sockaddr *)&client_sa, dont_fork);
2125                 } else {
2126 #endif
2127                         assert(proxy_mode == false);
2128
2129                         FD_ZERO(&fdset);
2130                         nfds = 0;
2131                         TAILQ_FOREACH(pg, &conf->conf_portal_groups, pg_next) {
2132                                 TAILQ_FOREACH(portal, &pg->pg_portals, p_next)
2133                                         nfds = fd_add(portal->p_socket, &fdset, nfds);
2134                         }
2135                         error = select(nfds + 1, &fdset, NULL, NULL, NULL);
2136                         if (error <= 0) {
2137                                 if (errno == EINTR)
2138                                         return;
2139                                 log_err(1, "select");
2140                         }
2141                         TAILQ_FOREACH(pg, &conf->conf_portal_groups, pg_next) {
2142                                 TAILQ_FOREACH(portal, &pg->pg_portals, p_next) {
2143                                         if (!FD_ISSET(portal->p_socket, &fdset))
2144                                                 continue;
2145                                         client_salen = sizeof(client_sa);
2146                                         client_fd = accept(portal->p_socket,
2147                                             (struct sockaddr *)&client_sa,
2148                                             &client_salen);
2149                                         if (client_fd < 0)
2150                                                 log_err(1, "accept");
2151                                         assert(client_salen >= client_sa.ss_len);
2152
2153                                         handle_connection(portal, client_fd,
2154                                             (struct sockaddr *)&client_sa,
2155                                             dont_fork);
2156                                         break;
2157                                 }
2158                         }
2159 #ifdef ICL_KERNEL_PROXY
2160                 }
2161 #endif
2162         }
2163 }
2164
2165 static void
2166 sighup_handler(int dummy __unused)
2167 {
2168
2169         sighup_received = true;
2170 }
2171
2172 static void
2173 sigterm_handler(int dummy __unused)
2174 {
2175
2176         sigterm_received = true;
2177 }
2178
2179 static void
2180 sigchld_handler(int dummy __unused)
2181 {
2182
2183         /*
2184          * The only purpose of this handler is to make SIGCHLD
2185          * interrupt the ISCSIDWAIT ioctl(2), so we can call
2186          * wait_for_children().
2187          */
2188 }
2189
2190 static void
2191 register_signals(void)
2192 {
2193         struct sigaction sa;
2194         int error;
2195
2196         bzero(&sa, sizeof(sa));
2197         sa.sa_handler = sighup_handler;
2198         sigfillset(&sa.sa_mask);
2199         error = sigaction(SIGHUP, &sa, NULL);
2200         if (error != 0)
2201                 log_err(1, "sigaction");
2202
2203         sa.sa_handler = sigterm_handler;
2204         error = sigaction(SIGTERM, &sa, NULL);
2205         if (error != 0)
2206                 log_err(1, "sigaction");
2207
2208         sa.sa_handler = sigterm_handler;
2209         error = sigaction(SIGINT, &sa, NULL);
2210         if (error != 0)
2211                 log_err(1, "sigaction");
2212
2213         sa.sa_handler = sigchld_handler;
2214         error = sigaction(SIGCHLD, &sa, NULL);
2215         if (error != 0)
2216                 log_err(1, "sigaction");
2217 }
2218
2219 int
2220 main(int argc, char **argv)
2221 {
2222         struct conf *oldconf, *newconf, *tmpconf;
2223         struct isns *newns;
2224         const char *config_path = DEFAULT_CONFIG_PATH;
2225         int debug = 0, ch, error;
2226         bool dont_daemonize = false;
2227
2228         while ((ch = getopt(argc, argv, "df:R")) != -1) {
2229                 switch (ch) {
2230                 case 'd':
2231                         dont_daemonize = true;
2232                         debug++;
2233                         break;
2234                 case 'f':
2235                         config_path = optarg;
2236                         break;
2237                 case 'R':
2238 #ifndef ICL_KERNEL_PROXY
2239                         log_errx(1, "ctld(8) compiled without ICL_KERNEL_PROXY "
2240                             "does not support iSER protocol");
2241 #endif
2242                         proxy_mode = true;
2243                         break;
2244                 case '?':
2245                 default:
2246                         usage();
2247                 }
2248         }
2249         argc -= optind;
2250         if (argc != 0)
2251                 usage();
2252
2253         log_init(debug);
2254         kernel_init();
2255
2256         oldconf = conf_new_from_kernel();
2257         newconf = conf_new_from_file(config_path);
2258         if (newconf == NULL)
2259                 log_errx(1, "configuration error; exiting");
2260         if (debug > 0) {
2261                 oldconf->conf_debug = debug;
2262                 newconf->conf_debug = debug;
2263         }
2264
2265         error = conf_apply(oldconf, newconf);
2266         if (error != 0)
2267                 log_errx(1, "failed to apply configuration; exiting");
2268
2269         conf_delete(oldconf);
2270         oldconf = NULL;
2271
2272         register_signals();
2273
2274         if (dont_daemonize == false) {
2275                 log_debugx("daemonizing");
2276                 if (daemon(0, 0) == -1) {
2277                         log_warn("cannot daemonize");
2278                         pidfile_remove(newconf->conf_pidfh);
2279                         exit(1);
2280                 }
2281         }
2282
2283         /* Schedule iSNS update */
2284         if (!TAILQ_EMPTY(&newconf->conf_isns))
2285                 set_timeout((newconf->conf_isns_period + 2) / 3, false);
2286
2287         for (;;) {
2288                 main_loop(newconf, dont_daemonize);
2289                 if (sighup_received) {
2290                         sighup_received = false;
2291                         log_debugx("received SIGHUP, reloading configuration");
2292                         tmpconf = conf_new_from_file(config_path);
2293                         if (tmpconf == NULL) {
2294                                 log_warnx("configuration error, "
2295                                     "continuing with old configuration");
2296                         } else {
2297                                 if (debug > 0)
2298                                         tmpconf->conf_debug = debug;
2299                                 oldconf = newconf;
2300                                 newconf = tmpconf;
2301                                 error = conf_apply(oldconf, newconf);
2302                                 if (error != 0)
2303                                         log_warnx("failed to reload "
2304                                             "configuration");
2305                                 conf_delete(oldconf);
2306                                 oldconf = NULL;
2307                         }
2308                 } else if (sigterm_received) {
2309                         log_debugx("exiting on signal; "
2310                             "reloading empty configuration");
2311
2312                         log_debugx("disabling CTL iSCSI port "
2313                             "and terminating all connections");
2314
2315                         oldconf = newconf;
2316                         newconf = conf_new();
2317                         if (debug > 0)
2318                                 newconf->conf_debug = debug;
2319                         error = conf_apply(oldconf, newconf);
2320                         if (error != 0)
2321                                 log_warnx("failed to apply configuration");
2322                         conf_delete(oldconf);
2323                         oldconf = NULL;
2324
2325                         log_warnx("exiting on signal");
2326                         exit(0);
2327                 } else {
2328                         nchildren -= wait_for_children(false);
2329                         assert(nchildren >= 0);
2330                         if (timed_out()) {
2331                                 set_timeout(0, false);
2332                                 TAILQ_FOREACH(newns, &newconf->conf_isns, i_next)
2333                                         isns_check(newns);
2334                                 /* Schedule iSNS update */
2335                                 if (!TAILQ_EMPTY(&newconf->conf_isns)) {
2336                                         set_timeout((newconf->conf_isns_period
2337                                             + 2) / 3,
2338                                             false);
2339                                 }
2340                         }
2341                 }
2342         }
2343         /* NOTREACHED */
2344 }