sbin/iscontrol/fsm.c

   1 /*-
   2  * Copyright (c) 2005-2010 Daniel Braniss <danny@cs.huji.ac.il>
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  *
  14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  24  * SUCH DAMAGE.
  25  *
  26  */
  27
  28 /*
  29  | $Id: fsm.c,v 2.8 2007/05/19 16:34:21 danny Exp danny $
  30  */
  31
  32 #include <sys/cdefs.h>
  33 __FBSDID("$FreeBSD$");
  34
  35 #include <sys/param.h>
  36 #include <sys/types.h>
  37 #include <sys/socket.h>
  38 #include <sys/sysctl.h>
  39
  40 #include <netinet/in.h>
  41 #include <netinet/tcp.h>
  42 #include <arpa/inet.h>
  43 #include <sys/ioctl.h>
  44 #include <netdb.h>
  45 #include <stdlib.h>
  46 #include <unistd.h>
  47 #include <stdio.h>
  48 #include <string.h>
  49 #include <errno.h>
  50 #include <fcntl.h>
  51 #include <time.h>
  52 #include <syslog.h>
  53 #include <stdarg.h>
  54 #include <camlib.h>
  55
  56 #include <dev/iscsi_initiator/iscsi.h>
  57 #include "iscontrol.h"
  58
  59 typedef enum {
  60      T1 = 1,
  61      T2, /*T3,*/ T4, T5, /*T6,*/ T7, T8, T9,
  62      T10, T11, T12, T13, T14, T15, T16, T18
  63 } trans_t;
  64
  65 /*
  66  | now supports IPV6
  67  | thanks to:
  68  |      Hajimu UMEMOTO @ Internet Mutual Aid Society Yokohama, Japan
  69  |      ume@mahoroba.org  ume@{,jp.}FreeBSD.org
  70  |      http://www.imasy.org/~ume/
  71  */
  72 static trans_t
  73 tcpConnect(isess_t *sess)
  74 {
  75      isc_opt_t *op = sess->op;
  76      int        val, sv_errno, soc;
  77      struct     addrinfo *res, *res0, hints;
  78      char       pbuf[10];
  79
  80      debug_called(3);
  81      if(sess->flags & (SESS_RECONNECT|SESS_REDIRECT)) {
  82           syslog(LOG_INFO, "%s", (sess->flags & SESS_RECONNECT)
  83                  ? "Reconnect": "Redirected");
  84
  85           debug(1, "%s", (sess->flags & SESS_RECONNECT) ? "Reconnect": "Redirected");
  86           shutdown(sess->soc, SHUT_RDWR);
  87           //close(sess->soc);
  88           sess->soc = -1;
  89
  90           sess->flags &= ~SESS_CONNECTED;
  91           if(sess->flags & SESS_REDIRECT) {
  92                sess->redirect_cnt++;
  93                sess->flags |= SESS_RECONNECT;
  94           } else
  95                sleep(2); // XXX: actually should be ?
  96 #ifdef notyet
  97           {
  98                time_t   sec;
  99                // make sure we are not in a loop
 100                // XXX: this code has to be tested
 101                sec = time(0) - sess->reconnect_time;
 102                if(sec > (5*60)) {
 103                     // if we've been connected for more that 5 minutes
 104                     // then just reconnect
 105                     sess->reconnect_time = sec;
 106                     sess->reconnect_cnt1 = 0;
 107                }
 108                else {
 109                     //
 110                     sess->reconnect_cnt1++;
 111                     if((sec / sess->reconnect_cnt1) < 2) {
 112                          // if less that 2 seconds from the last reconnect
 113                          // we are most probably looping
 114                          syslog(LOG_CRIT, "too many reconnects %d", sess->reconnect_cnt1);
 115                          return 0;
 116                     }
 117                }
 118           }
 119 #endif
 120           sess->reconnect_cnt++;
 121      }
 122
 123      snprintf(pbuf, sizeof(pbuf), "%d", op->port);
 124      memset(&hints, 0, sizeof(hints));
 125      hints.ai_family    = PF_UNSPEC;
 126      hints.ai_socktype  = SOCK_STREAM;
 127      debug(1, "targetAddress=%s port=%d", op->targetAddress, op->port);
 128      if((val = getaddrinfo(op->targetAddress, pbuf, &hints, &res0)) != 0) {
 129           fprintf(stderr, "getaddrinfo(%s): %s\n", op->targetAddress, gai_strerror(val));
 130           return 0;
 131      }
 132      sess->flags &= ~SESS_CONNECTED;
 133      sv_errno = 0;
 134      soc = -1;
 135      for(res = res0; res; res = res->ai_next) {
 136           soc = socket(res->ai_family, res->ai_socktype, res->ai_protocol);
 137           if (soc == -1)
 138                continue;
 139
 140           // from Patrick.Guelat@imp.ch:
 141           // iscontrol can be called without waiting for the socket entry to time out
 142           val = 1;
 143           if(setsockopt(soc, SOL_SOCKET, SO_REUSEADDR, &val, (socklen_t)sizeof(val)) < 0) {
 144                fprintf(stderr, "Cannot set socket SO_REUSEADDR %d: %s\n\n",
 145                        errno, strerror(errno));
 146           }
 147
 148           if(connect(soc, res->ai_addr, res->ai_addrlen) == 0)
 149                break;
 150           sv_errno = errno;
 151           close(soc);
 152           soc = -1;
 153      }
 154      freeaddrinfo(res0);
 155      if(soc != -1) {
 156           sess->soc = soc;
 157
 158 #if 0
 159           struct        timeval timeout;
 160
 161           val = 1;
 162           if(setsockopt(sess->soc, IPPROTO_TCP, TCP_KEEPALIVE, &val, sizeof(val)) < 0)
 163                fprintf(stderr, "Cannot set socket KEEPALIVE option err=%d %s\n",
 164                        errno, strerror(errno));
 165
 166           if(setsockopt(sess->soc, IPPROTO_TCP, TCP_NODELAY, &val, sizeof(val)) < 0)
 167                fprintf(stderr, "Cannot set socket NO delay option err=%d %s\n",
 168                        errno, strerror(errno));
 169
 170           timeout.tv_sec = 10;
 171           timeout.tv_usec = 0;
 172           if((setsockopt(sess->soc, SOL_SOCKET, SO_SNDTIMEO, &timeout, sizeof(timeout)) < 0)
 173              || (setsockopt(sess->soc, SOL_SOCKET, SO_RCVTIMEO, &timeout, sizeof(timeout)) < 0)) {
 174                fprintf(stderr, "Cannot set socket timeout to %ld err=%d %s\n",
 175                        timeout.tv_sec, errno, strerror(errno));
 176           }
 177 #endif
 178 #ifdef CURIOUS
 179           {
 180                int len = sizeof(val);
 181                if(getsockopt(sess->soc, SOL_SOCKET, SO_SNDBUF, &val, &len) == 0)
 182                     fprintf(stderr, "was: SO_SNDBUF=%dK\n", val/1024);
 183           }
 184 #endif
 185           if(sess->op->sockbufsize) {
 186                val = sess->op->sockbufsize * 1024;
 187                if((setsockopt(sess->soc, SOL_SOCKET, SO_SNDBUF, &val, sizeof(val)) < 0)
 188                   || (setsockopt(sess->soc, SOL_SOCKET, SO_RCVBUF, &val, sizeof(val)) < 0)) {
 189                     fprintf(stderr, "Cannot set socket sndbuf & rcvbuf to %d err=%d %s\n",
 190                             val, errno, strerror(errno));
 191                     return 0;
 192                }
 193           }
 194           sess->flags |= SESS_CONNECTED;
 195           return T1;
 196      }
 197
 198      fprintf(stderr, "errno=%d\n", sv_errno);
 199      perror("connect");
 200      switch(sv_errno) {
 201      case ECONNREFUSED:
 202      case ENETUNREACH:
 203      case ETIMEDOUT:
 204           if((sess->flags & SESS_REDIRECT) == 0) {
 205                if(strcmp(op->targetAddress, sess->target.address) != 0) {
 206                     syslog(LOG_INFO, "reconnecting to original target address");
 207                     free(op->targetAddress);
 208                     op->targetAddress           = sess->target.address;
 209                     op->port                    = sess->target.port;
 210                     op->targetPortalGroupTag    = sess->target.pgt;
 211                     return T1;
 212                }
 213           }
 214           sleep(5); // for now ...
 215           return T1;
 216      default:
 217           return 0; // terminal error
 218      }
 219 }
 220
 221 int
 222 setOptions(isess_t *sess, int flag)
 223 {
 224      isc_opt_t  oop;
 225      char       *sep;
 226
 227      debug_called(3);
 228
 229      bzero(&oop, sizeof(isc_opt_t));
 230
 231      if((flag & SESS_FULLFEATURE) == 0) {
 232           oop.initiatorName     = sess->op->initiatorName;
 233           oop.targetAddress     = sess->op->targetAddress;
 234           if(sess->op->targetName != 0)
 235                oop.targetName = sess->op->targetName;
 236
 237           oop.maxRecvDataSegmentLength = sess->op->maxRecvDataSegmentLength;
 238           oop.maxXmitDataSegmentLength = sess->op->maxXmitDataSegmentLength; // XXX:
 239           oop.maxBurstLength = sess->op->maxBurstLength;
 240           oop.maxluns = sess->op->maxluns;
 241      }
 242      else {
 243           /*
 244            | turn on digestion only after login
 245            */
 246           if(sess->op->headerDigest != NULL) {
 247                sep = strchr(sess->op->headerDigest, ',');
 248                if(sep == NULL)
 249                     oop.headerDigest = sess->op->headerDigest;
 250                debug(1, "oop.headerDigest=%s", oop.headerDigest);
 251           }
 252           if(sess->op->dataDigest != NULL) {
 253                sep = strchr(sess->op->dataDigest, ',');
 254                if(sep == NULL)
 255                     oop.dataDigest = sess->op->dataDigest;
 256                debug(1, "oop.dataDigest=%s", oop.dataDigest);
 257           }
 258      }
 259
 260      if(ioctl(sess->fd, ISCSISETOPT, &oop)) {
 261           perror("ISCSISETOPT");
 262           return -1;
 263      }
 264      return 0;
 265 }
 266
 267 static trans_t
 268 startSession(isess_t *sess)
 269 {
 270
 271      int        n, fd, nfd;
 272      char       *dev;
 273
 274      debug_called(3);
 275
 276      if((sess->flags & SESS_CONNECTED) == 0) {
 277           return T2;
 278      }
 279      if(sess->fd == -1) {
 280           fd = open(iscsidev, O_RDWR);
 281           if(fd < 0) {
 282                perror(iscsidev);
 283                return 0;
 284           }
 285           {
 286                // XXX: this has to go
 287                size_t   n;
 288                n = sizeof(sess->isid);
 289                if(sysctlbyname("net.iscsi_initiator.isid", (void *)sess->isid, (size_t *)&n, 0, 0) != 0)
 290                     perror("sysctlbyname");
 291           }
 292           if(ioctl(fd, ISCSISETSES, &n)) {
 293                perror("ISCSISETSES");
 294                return 0;
 295           }
 296           asprintf(&dev, "%s%d", iscsidev, n);
 297           nfd = open(dev, O_RDWR);
 298           if(nfd < 0) {
 299                perror(dev);
 300                free(dev);
 301                return 0;
 302           }
 303           free(dev);
 304           close(fd);
 305           sess->fd = nfd;
 306
 307           if(setOptions(sess, 0) != 0)
 308                return -1;
 309      }
 310
 311      if(ioctl(sess->fd, ISCSISETSOC, &sess->soc)) {
 312           perror("ISCSISETSOC");
 313           return 0;
 314      }
 315
 316      return T4;
 317 }
 318
 319 isess_t *currsess;
 320
 321 static void
 322 trap(int sig)
 323 {
 324      syslog(LOG_NOTICE, "trapped signal %d", sig);
 325      fprintf(stderr, "trapped signal %d\n", sig);
 326
 327      switch(sig) {
 328      case SIGHUP:
 329           currsess->flags |= SESS_DISCONNECT;
 330           break;
 331
 332      case SIGUSR1:
 333           currsess->flags |= SESS_RECONNECT;
 334           break;
 335
 336      case SIGINT:
 337      case SIGTERM:
 338      default:
 339           return; // ignore
 340      }
 341 }
 342
 343 static int
 344 doCAM(isess_t *sess)
 345 {
 346      char       pathstr[1024];
 347      union ccb  *ccb;
 348      int        i, n;
 349
 350      if(ioctl(sess->fd, ISCSIGETCAM, &sess->cam) != 0) {
 351           syslog(LOG_WARNING, "ISCSIGETCAM failed: %d", errno);
 352           return 0;
 353      }
 354      debug(1, "nluns=%d", sess->cam.target_nluns);
 355      /*
 356       | for now will do this for each lun ...
 357       */
 358      for(n = i = 0; i < sess->cam.target_nluns; i++) {
 359           debug(2, "CAM path_id=%d target_id=%d",
 360                 sess->cam.path_id, sess->cam.target_id);
 361
 362           sess->camdev = cam_open_btl(sess->cam.path_id, sess->cam.target_id,
 363                                       i, O_RDWR, NULL);
 364           if(sess->camdev == NULL) {
 365                //syslog(LOG_WARNING, "%s", cam_errbuf);
 366                debug(3, "%s", cam_errbuf);
 367                continue;
 368           }
 369
 370           cam_path_string(sess->camdev, pathstr, sizeof(pathstr));
 371           debug(2, "pathstr=%s", pathstr);
 372
 373           ccb = cam_getccb(sess->camdev);
 374           CCB_CLEAR_ALL_EXCEPT_HDR(&ccb->crs);
 375           ccb->ccb_h.func_code = XPT_REL_SIMQ;
 376           ccb->crs.release_flags = RELSIM_ADJUST_OPENINGS;
 377           ccb->crs.openings = sess->op->tags;
 378           if(cam_send_ccb(sess->camdev, ccb) < 0)
 379                debug(2, "%s", cam_errbuf);
 380           else
 381           if((ccb->ccb_h.status & CAM_STATUS_MASK) != CAM_REQ_CMP) {
 382                syslog(LOG_WARNING, "XPT_REL_SIMQ CCB failed");
 383                // cam_error_print(sess->camdev, ccb, CAM_ESF_ALL, CAM_EPF_ALL, stderr);
 384           }
 385           else {
 386                n++;
 387                syslog(LOG_INFO, "%s tagged openings now %d\n", pathstr, ccb->crs.openings);
 388           }
 389           cam_freeccb(ccb);
 390           cam_close_device(sess->camdev);
 391      }
 392      return n;
 393 }
 394
 395 static trans_t
 396 supervise(isess_t *sess)
 397 {
 398      int        sig, val;
 399
 400      debug_called(3);
 401
 402      if(strcmp(sess->op->sessionType, "Discovery") == 0) {
 403           sess->flags |= SESS_DISCONNECT;
 404           return T9;
 405      }
 406
 407      if(vflag)
 408           printf("ready to go scsi\n");
 409
 410      if(setOptions(sess, SESS_FULLFEATURE) != 0)
 411           return 0; // failure
 412
 413      if((sess->flags & SESS_FULLFEATURE) == 0) {
 414           if(daemon(0, 1) != 0) {
 415                perror("daemon");
 416                exit(1);
 417           }
 418           if(sess->op->pidfile != NULL) {
 419                FILE *pidf;
 420
 421                pidf = fopen(sess->op->pidfile, "w");
 422                if(pidf != NULL) {
 423                     fprintf(pidf, "%d\n", getpid());
 424                     fclose(pidf);
 425                }
 426           }
 427           openlog("iscontrol", LOG_CONS|LOG_PERROR|LOG_PID|LOG_NDELAY, LOG_KERN);
 428           syslog(LOG_INFO, "running");
 429
 430           currsess = sess;
 431           if(ioctl(sess->fd, ISCSISTART)) {
 432                perror("ISCSISTART");
 433                return -1;
 434           }
 435           if(doCAM(sess) == 0) {
 436                syslog(LOG_WARNING, "no device found");
 437                ioctl(sess->fd, ISCSISTOP);
 438                return T15;
 439           }
 440
 441      }
 442      else {
 443           if(ioctl(sess->fd, ISCSIRESTART)) {
 444                perror("ISCSIRESTART");
 445                return -1;
 446           }
 447      }
 448
 449      signal(SIGINT, trap);
 450      signal(SIGHUP, trap);
 451      signal(SIGTERM, trap);
 452
 453      sig = SIGUSR1;
 454      signal(sig, trap);
 455      if(ioctl(sess->fd, ISCSISIGNAL, &sig)) {
 456           perror("ISCSISIGNAL");
 457           return -1;
 458      }
 459      sess->flags |= SESS_FULLFEATURE;
 460
 461      sess->flags &= ~(SESS_REDIRECT | SESS_RECONNECT);
 462      if(vflag)
 463           printf("iscontrol: supervise starting main loop\n");
 464      /*
 465       | the main loop - actually do nothing
 466       | all the work is done inside the kernel
 467       */
 468      while((sess->flags & (SESS_REDIRECT|SESS_RECONNECT|SESS_DISCONNECT)) == 0) {
 469           // do something?
 470           // like sending a nop_out?
 471           sleep(60);
 472      }
 473      printf("iscontrol: supervise going down\n");
 474      syslog(LOG_INFO, "sess flags=%x", sess->flags);
 475
 476      sig = 0;
 477      if(ioctl(sess->fd, ISCSISIGNAL, &sig)) {
 478           perror("ISCSISIGNAL");
 479      }
 480
 481      if(sess->flags & SESS_DISCONNECT) {
 482           sess->flags &= ~SESS_FULLFEATURE;
 483           return T9;
 484      }
 485      else {
 486           val = 0;
 487           if(ioctl(sess->fd, ISCSISTOP, &val)) {
 488                perror("ISCSISTOP");
 489           }
 490           sess->flags |= SESS_INITIALLOGIN1;
 491      }
 492      return T8;
 493 }
 494
 495 static int
 496 handledDiscoveryResp(isess_t *sess, pdu_t *pp)
 497 {
 498      u_char     *ptr;
 499      int        len, n;
 500
 501      debug_called(3);
 502
 503      len = pp->ds_len;
 504      ptr = pp->ds_addr;
 505      while(len > 0) {
 506           if(*ptr != 0)
 507                printf("%s\n", ptr);
 508           n = strlen((char *)ptr) + 1;
 509           len -= n;
 510           ptr += n;
 511      }
 512      return 0;
 513 }
 514
 515 static int
 516 doDiscovery(isess_t *sess)
 517 {
 518      pdu_t      spp;
 519      text_req_t *tp = (text_req_t *)&spp.ipdu.bhs;
 520
 521      debug_called(3);
 522
 523      bzero(&spp, sizeof(pdu_t));
 524      tp->cmd = ISCSI_TEXT_CMD /*| 0x40 */; // because of a bug in openiscsi-target
 525      tp->F = 1;
 526      tp->ttt = 0xffffffff;
 527      addText(&spp, "SendTargets=All");
 528      return sendPDU(sess, &spp, handledDiscoveryResp);
 529 }
 530
 531 static trans_t
 532 doLogin(isess_t *sess)
 533 {
 534      isc_opt_t  *op = sess->op;
 535      int        status, count;
 536
 537      debug_called(3);
 538
 539      if(op->chapSecret == NULL && op->tgtChapSecret == NULL)
 540           /*
 541            | don't need any security negotiation
 542            | or in other words: we don't have any secrets to exchange
 543            */
 544           sess->csg = LON_PHASE;
 545      else
 546           sess->csg = SN_PHASE;
 547
 548      if(sess->tsih) {
 549           sess->tsih = 0;       // XXX: no 'reconnect' yet
 550           sess->flags &= ~SESS_NEGODONE; // XXX: KLUDGE
 551      }
 552      count = 10; // should be more than enough
 553      do {
 554           debug(3, "count=%d csg=%d", count, sess->csg);
 555           status = loginPhase(sess);
 556           if(count-- == 0)
 557                // just in case we get into a loop
 558                status = -1;
 559      } while(status == 0 && (sess->csg != FF_PHASE));
 560
 561      sess->flags &= ~SESS_INITIALLOGIN;
 562      debug(3, "status=%d", status);
 563
 564      switch(status) {
 565      case 0: // all is ok ...
 566           sess->flags |= SESS_LOGGEDIN;
 567           if(strcmp(sess->op->sessionType, "Discovery") == 0)
 568                doDiscovery(sess);
 569           return T5;
 570
 571      case 1:    // redirect - temporary/permanent
 572           /*
 573            | start from scratch?
 574            */
 575           sess->flags &= ~SESS_NEGODONE;
 576           sess->flags |= (SESS_REDIRECT | SESS_INITIALLOGIN1);
 577           syslog(LOG_DEBUG, "target sent REDIRECT");
 578           return T7;
 579
 580      case 2: // initiator terminal error
 581           return 0;
 582      case 3: // target terminal error -- could retry ...
 583           sleep(5);
 584           return T7; // lets try
 585      default:
 586           return 0;
 587      }
 588 }
 589
 590 static int
 591 handleLogoutResp(isess_t *sess, pdu_t *pp)
 592 {
 593      if(sess->flags & SESS_DISCONNECT) {
 594           int val = 0;
 595           if(ioctl(sess->fd, ISCSISTOP, &val)) {
 596                perror("ISCSISTOP");
 597           }
 598           return 0;
 599      }
 600      return T13;
 601 }
 602
 603 static trans_t
 604 startLogout(isess_t *sess)
 605 {
 606      pdu_t      spp;
 607      logout_req_t *p = (logout_req_t *)&spp.ipdu.bhs;
 608
 609      bzero(&spp, sizeof(pdu_t));
 610      p->cmd = ISCSI_LOGOUT_CMD| 0x40;
 611      p->reason = BIT(7) | 0;
 612      p->CID = htons(1);
 613
 614      return sendPDU(sess, &spp, handleLogoutResp);
 615 }
 616
 617 static trans_t
 618 inLogout(isess_t *sess)
 619 {
 620      if(sess->flags & SESS_RECONNECT)
 621           return T18;
 622      return 0;
 623 }
 624
 625 typedef enum {
 626      S1, S2, /*S3,*/ S4, S5, S6, S7, S8
 627 } state_t;
 628 \f
 629 /**
 630       S1: FREE
 631       S2: XPT_WAIT
 632       S4: IN_LOGIN
 633       S5: LOGGED_IN
 634       S6: IN_LOGOUT
 635       S7: LOGOUT_REQUESTED
 636       S8: CLEANUP_WAIT
 637
 638                      -------<-------------+
 639          +--------->/ S1    \<----+       |
 640       T13|       +->\       /<-+   \      |
 641          |      /    ---+---    \   \     |
 642          |     /        |     T2 \   |    |
 643          |  T8 |        |T1       |  |    |
 644          |     |        |        /   |T7  |
 645          |     |        |       /    |    |
 646          |     |        |      /     |    |
 647          |     |        V     /     /     |
 648          |     |     ------- /     /      |
 649          |     |    / S2    \     /       |
 650          |     |    \       /    /        |
 651          |     |     ---+---    /         |
 652          |     |        |T4    /          |
 653          |     |        V     /           | T18
 654          |     |     ------- /            |
 655          |     |    / S4    \             |
 656          |     |    \       /             |
 657          |     |     ---+---              |         T15
 658          |     |        |T5      +--------+---------+
 659          |     |        |       /T16+-----+------+  |
 660          |     |        |      /   -+-----+--+   |  |
 661          |     |        |     /   /  S7   \  |T12|  |
 662          |     |        |    / +->\       /<-+   V  V
 663          |     |        |   / /    -+-----       -------
 664          |     |        |  / /T11   |T10        /  S8   \
 665          |     |        V / /       V  +----+   \       /
 666          |     |      ---+-+-      ----+--  |    -------
 667          |     |     / S5    \T9  / S6    \<+    ^
 668          |     +-----\       /--->\       / T14  |
 669          |            -------      --+----+------+T17
 670          +---------------------------+
 671 */
 672
 673 int
 674 fsm(isc_opt_t *op)
 675 {
 676      state_t    state;
 677      isess_t    *sess;
 678
 679      if((sess = calloc(1, sizeof(isess_t))) == NULL) {
 680           // boy, is this a bad start ...
 681           fprintf(stderr, "no memory!\n");
 682           return -1;
 683      }
 684
 685      state = S1;
 686      sess->op = op;
 687      sess->fd = -1;
 688      sess->soc = -1;
 689      sess->target.address = strdup(op->targetAddress);
 690      sess->target.port = op->port;
 691      sess->target.pgt = op->targetPortalGroupTag;
 692
 693      sess->flags = SESS_INITIALLOGIN | SESS_INITIALLOGIN1;
 694
 695      do {
 696           switch(state) {
 697
 698           case S1:
 699                switch(tcpConnect(sess)) {
 700                case T1: state = S2; break;
 701                default: state = S8; break;
 702                }
 703                break;
 704
 705           case S2:
 706                switch(startSession(sess)) {
 707                case T2: state = S1; break;
 708                case T4: state = S4; break;
 709                default: state = S8; break;
 710                }
 711                break;
 712
 713           case S4:
 714                switch(doLogin(sess)) {
 715                case T7:  state = S1; break;
 716                case T5:  state = S5; break;
 717                default: state = S8; break;
 718                }
 719                break;
 720
 721           case S5:
 722                switch(supervise(sess)) {
 723                case T8:  state = S1; break;
 724                case T9:  state = S6; break;
 725                case T11: state = S7; break;
 726                case T15: state = S8; break;
 727                default: state = S8; break;
 728                }
 729                break;
 730
 731           case S6:
 732                switch(startLogout(sess)) {
 733                case T13: state = S1; break;
 734                case T14: state = S6; break;
 735                case T16: state = S8; break;
 736                default: state = S8; break;
 737                }
 738                break;
 739
 740           case S7:
 741                switch(inLogout(sess)) {
 742                case T18: state = S1; break;
 743                case T10: state = S6; break;
 744                case T12: state = S7; break;
 745                case T16: state = S8; break;
 746                default: state = S8; break;
 747                }
 748                break;
 749
 750           case S8:
 751                // maybe do some clean up?
 752                syslog(LOG_INFO, "terminated");
 753                return 0;
 754           }
 755      } while(1);
 756 }