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