src/modules/rlm_radutmp/rlm_radutmp.c

   1 /*
   2  * rlm_radutmp.c
   3  *
   4  * Version:     $Id$
   5  *
   6  *   This program is free software; you can redistribute it and/or modify
   7  *   it under the terms of the GNU General Public License as published by
   8  *   the Free Software Foundation; either version 2 of the License, or
   9  *   (at your option) any later version.
  10  *
  11  *   This program is distributed in the hope that it will be useful,
  12  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  *   GNU General Public License for more details.
  15  *
  16  *   You should have received a copy of the GNU General Public License
  17  *   along with this program; if not, write to the Free Software
  18  *   Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
  19  *
  20  * Copyright 2000,2006  The FreeRADIUS server project
  21  * FIXME add copyrights
  22  */
  23
  24 #include        <freeradius-devel/ident.h>
  25 RCSID("$Id$")
  26
  27 #include        <freeradius-devel/radiusd.h>
  28 #include        <freeradius-devel/radutmp.h>
  29 #include        <freeradius-devel/modules.h>
  30 #include        <freeradius-devel/rad_assert.h>
  31
  32 #include        <fcntl.h>
  33 #include        <limits.h>
  34
  35 #include "config.h"
  36
  37 #define LOCK_LEN sizeof(struct radutmp)
  38
  39 static const char porttypes[] = "ASITX";
  40
  41 /*
  42  *      used for caching radutmp lookups in the accounting component. The
  43  *      session (checksimul) component doesn't use it, but probably should.
  44  */
  45 typedef struct nas_port {
  46         uint32_t                nasaddr;
  47         unsigned int    port;
  48         off_t                   offset;
  49         struct nas_port         *next;
  50 } NAS_PORT;
  51
  52 typedef struct rlm_radutmp_t {
  53         NAS_PORT        *nas_port_list;
  54         char            *filename;
  55         char            *username;
  56         int             case_sensitive;
  57         int             check_nas;
  58         int             permission;
  59         int             callerid_ok;
  60 } rlm_radutmp_t;
  61
  62 static const CONF_PARSER module_config[] = {
  63         { "filename", PW_TYPE_STRING_PTR,
  64           offsetof(rlm_radutmp_t,filename), NULL,  RADUTMP },
  65         { "username", PW_TYPE_STRING_PTR,
  66           offsetof(rlm_radutmp_t,username), NULL,  "%{User-Name}"},
  67         { "case_sensitive", PW_TYPE_BOOLEAN,
  68           offsetof(rlm_radutmp_t,case_sensitive), NULL,  "yes"},
  69         { "check_with_nas", PW_TYPE_BOOLEAN,
  70           offsetof(rlm_radutmp_t,check_nas), NULL,  "yes"},
  71         { "perm",     PW_TYPE_INTEGER,
  72           offsetof(rlm_radutmp_t,permission), NULL,  "0644" },
  73         { "callerid", PW_TYPE_BOOLEAN,
  74           offsetof(rlm_radutmp_t,callerid_ok), NULL, "no" },
  75         { NULL, -1, 0, NULL, NULL }             /* end the list */
  76 };
  77
  78 static int radutmp_instantiate(CONF_SECTION *conf, void **instance)
  79 {
  80         rlm_radutmp_t *inst;
  81
  82         inst = rad_malloc(sizeof(*inst));
  83         if (!inst) {
  84                 return -1;
  85         }
  86         memset(inst, 0, sizeof(*inst));
  87
  88         if (cf_section_parse(conf, inst, module_config)) {
  89                 free(inst);
  90                 return -1;
  91         }
  92
  93         inst->nas_port_list = NULL;
  94         *instance = inst;
  95         return 0;
  96 }
  97
  98
  99 /*
 100  *      Detach.
 101  */
 102 static int radutmp_detach(void *instance)
 103 {
 104         NAS_PORT *p, *next;
 105         rlm_radutmp_t *inst = instance;
 106
 107         for (p = inst->nas_port_list ; p ; p=next) {
 108                 next = p->next;
 109                 free(p);
 110         }
 111         free(inst);
 112         return 0;
 113 }
 114
 115 /*
 116  *      Zap all users on a NAS from the radutmp file.
 117  */
 118 static int radutmp_zap(UNUSED rlm_radutmp_t *inst,
 119                        const char *filename,
 120                        uint32_t nasaddr,
 121                        time_t t)
 122 {
 123         struct radutmp  u;
 124         int             fd;
 125
 126         if (t == 0) time(&t);
 127
 128         fd = open(filename, O_RDWR);
 129         if (fd < 0) {
 130                 radlog(L_ERR, "rlm_radutmp: Error accessing file %s: %s",
 131                        filename, strerror(errno));
 132                 return RLM_MODULE_FAIL;
 133         }
 134
 135         /*
 136          *      Lock the utmp file, prefer lockf() over flock().
 137          */
 138         rad_lockfd(fd, LOCK_LEN);
 139
 140         /*
 141          *      Find the entry for this NAS / portno combination.
 142          */
 143         while (read(fd, &u, sizeof(u)) == sizeof(u)) {
 144           if ((nasaddr != 0 && nasaddr != u.nas_address) ||
 145               u.type != P_LOGIN)
 146             continue;
 147           /*
 148            *    Match. Zap it.
 149            */
 150           if (lseek(fd, -(off_t)sizeof(u), SEEK_CUR) < 0) {
 151             radlog(L_ERR, "rlm_radutmp: radutmp_zap: negative lseek!");
 152             lseek(fd, (off_t)0, SEEK_SET);
 153           }
 154           u.type = P_IDLE;
 155           u.time = t;
 156           write(fd, &u, sizeof(u));
 157         }
 158         close(fd);      /* and implicitely release the locks */
 159
 160         return 0;
 161 }
 162
 163 /*
 164  *      Lookup a NAS_PORT in the nas_port_list
 165  */
 166 static NAS_PORT *nas_port_find(NAS_PORT *nas_port_list, uint32_t nasaddr, unsigned int port)
 167 {
 168         NAS_PORT        *cl;
 169
 170         for(cl = nas_port_list; cl; cl = cl->next)
 171                 if (nasaddr == cl->nasaddr &&
 172                         port == cl->port)
 173                         break;
 174         return cl;
 175 }
 176
 177
 178 #ifdef WITH_ACCOUNTING
 179 /*
 180  *      Store logins in the RADIUS utmp file.
 181  */
 182 static int radutmp_accounting(void *instance, REQUEST *request)
 183 {
 184         struct radutmp  ut, u;
 185         VALUE_PAIR      *vp;
 186         int             status = -1;
 187         int             protocol = -1;
 188         time_t          t;
 189         int             fd;
 190         int             port_seen = 0;
 191         int             off;
 192         rlm_radutmp_t   *inst = instance;
 193         char            buffer[256];
 194         char            filename[1024];
 195         char            ip_name[32]; /* 255.255.255.255 */
 196         const char      *nas;
 197         NAS_PORT        *cache;
 198         int             r;
 199
 200         if (request->packet->src_ipaddr.af != AF_INET) {
 201                 DEBUG("rlm_radutmp: IPv6 not supported!");
 202                 return RLM_MODULE_NOOP;
 203         }
 204
 205         /*
 206          *      Which type is this.
 207          */
 208         if ((vp = pairfind(request->packet->vps, PW_ACCT_STATUS_TYPE, 0)) == NULL) {
 209                 radlog(L_ERR, "rlm_radutmp: No Accounting-Status-Type record.");
 210                 return RLM_MODULE_NOOP;
 211         }
 212         status = vp->vp_integer;
 213
 214         /*
 215          *      Look for weird reboot packets.
 216          *
 217          *      ComOS (up to and including 3.5.1b20) does not send
 218          *      standard PW_STATUS_ACCOUNTING_XXX messages.
 219          *
 220          *      Check for:  o no Acct-Session-Time, or time of 0
 221          *                  o Acct-Session-Id of "00000000".
 222          *
 223          *      We could also check for NAS-Port, that attribute
 224          *      should NOT be present (but we don't right now).
 225          */
 226         if ((status != PW_STATUS_ACCOUNTING_ON) &&
 227             (status != PW_STATUS_ACCOUNTING_OFF)) do {
 228                 int check1 = 0;
 229                 int check2 = 0;
 230
 231                 if ((vp = pairfind(request->packet->vps, PW_ACCT_SESSION_TIME, 0))
 232                      == NULL || vp->vp_date == 0)
 233                         check1 = 1;
 234                 if ((vp = pairfind(request->packet->vps, PW_ACCT_SESSION_ID, 0))
 235                      != NULL && vp->length == 8 &&
 236                      memcmp(vp->vp_strvalue, "00000000", 8) == 0)
 237                         check2 = 1;
 238                 if (check1 == 0 || check2 == 0) {
 239 #if 0 /* Cisco sometimes sends START records without username. */
 240                         radlog(L_ERR, "rlm_radutmp: no username in record");
 241                         return RLM_MODULE_FAIL;
 242 #else
 243                         break;
 244 #endif
 245                 }
 246                 radlog(L_INFO, "rlm_radutmp: converting reboot records.");
 247                 if (status == PW_STATUS_STOP)
 248                         status = PW_STATUS_ACCOUNTING_OFF;
 249                 if (status == PW_STATUS_START)
 250                         status = PW_STATUS_ACCOUNTING_ON;
 251         } while(0);
 252
 253         time(&t);
 254         memset(&ut, 0, sizeof(ut));
 255         ut.porttype = 'A';
 256         ut.nas_address = htonl(INADDR_NONE);
 257
 258         /*
 259          *      First, find the interesting attributes.
 260          */
 261         for (vp = request->packet->vps; vp; vp = vp->next) {
 262                 switch (vp->attribute) {
 263                         case PW_LOGIN_IP_HOST:
 264                         case PW_FRAMED_IP_ADDRESS:
 265                                 ut.framed_address = vp->vp_ipaddr;
 266                                 break;
 267                         case PW_FRAMED_PROTOCOL:
 268                                 protocol = vp->vp_integer;
 269                                 break;
 270                         case PW_NAS_IP_ADDRESS:
 271                                 ut.nas_address = vp->vp_ipaddr;
 272                                 break;
 273                         case PW_NAS_PORT:
 274                                 ut.nas_port = vp->vp_integer;
 275                                 port_seen = 1;
 276                                 break;
 277                         case PW_ACCT_DELAY_TIME:
 278                                 ut.delay = vp->vp_integer;
 279                                 break;
 280                         case PW_ACCT_SESSION_ID:
 281                                 /*
 282                                  *      If length > 8, only store the
 283                                  *      last 8 bytes.
 284                                  */
 285                                 off = vp->length - sizeof(ut.session_id);
 286                                 /*
 287                                  *      Ascend is br0ken - it adds a \0
 288                                  *      to the end of any string.
 289                                  *      Compensate.
 290                                  */
 291                                 if (vp->length > 0 &&
 292                                     vp->vp_strvalue[vp->length - 1] == 0)
 293                                         off--;
 294                                 if (off < 0) off = 0;
 295                                 memcpy(ut.session_id, vp->vp_strvalue + off,
 296                                         sizeof(ut.session_id));
 297                                 break;
 298                         case PW_NAS_PORT_TYPE:
 299                                 if (vp->vp_integer <= 4)
 300                                         ut.porttype = porttypes[vp->vp_integer];
 301                                 break;
 302                         case PW_CALLING_STATION_ID:
 303                                 if(inst->callerid_ok)
 304                                         strlcpy(ut.caller_id,
 305                                                 (char *)vp->vp_strvalue,
 306                                                 sizeof(ut.caller_id));
 307                                 break;
 308                 }
 309         }
 310
 311         /*
 312          *      If we didn't find out the NAS address, use the
 313          *      originator's IP address.
 314          */
 315         if (ut.nas_address == htonl(INADDR_NONE)) {
 316                 ut.nas_address = request->packet->src_ipaddr.ipaddr.ip4addr.s_addr;
 317                 nas = request->client->shortname;
 318
 319         } else if (request->packet->src_ipaddr.ipaddr.ip4addr.s_addr == ut.nas_address) {               /* might be a client, might not be. */
 320                 nas = request->client->shortname;
 321
 322         } else {
 323                 /*
 324                  *      The NAS isn't a client, it's behind
 325                  *      a proxy server.  In that case, just
 326                  *      get the IP address.
 327                  */
 328                 nas = ip_ntoa(ip_name, ut.nas_address);
 329         }
 330
 331         /*
 332          *      Set the protocol field.
 333          */
 334         if (protocol == PW_PPP)
 335                 ut.proto = 'P';
 336         else if (protocol == PW_SLIP)
 337                 ut.proto = 'S';
 338         else
 339                 ut.proto = 'T';
 340         ut.time = t - ut.delay;
 341
 342         /*
 343          *      Get the utmp filename, via xlat.
 344          */
 345         radius_xlat(filename, sizeof(filename), inst->filename, request, NULL);
 346
 347         /*
 348          *      See if this was a reboot.
 349          *
 350          *      Hmm... we may not want to zap all of the users when
 351          *      the NAS comes up, because of issues with receiving
 352          *      UDP packets out of order.
 353          */
 354         if (status == PW_STATUS_ACCOUNTING_ON &&
 355             (ut.nas_address != htonl(INADDR_NONE))) {
 356                 radlog(L_INFO, "rlm_radutmp: NAS %s restarted (Accounting-On packet seen)",
 357                        nas);
 358                 radutmp_zap(inst, filename, ut.nas_address, ut.time);
 359                 return RLM_MODULE_OK;
 360         }
 361
 362         if (status == PW_STATUS_ACCOUNTING_OFF &&
 363             (ut.nas_address != htonl(INADDR_NONE))) {
 364                 radlog(L_INFO, "rlm_radutmp: NAS %s rebooted (Accounting-Off packet seen)",
 365                        nas);
 366                 radutmp_zap(inst, filename, ut.nas_address, ut.time);
 367                 return RLM_MODULE_OK;
 368         }
 369
 370         /*
 371          *      If we don't know this type of entry pretend we succeeded.
 372          */
 373         if (status != PW_STATUS_START &&
 374             status != PW_STATUS_STOP &&
 375             status != PW_STATUS_ALIVE) {
 376                 radlog(L_ERR, "rlm_radutmp: NAS %s port %u unknown packet type %d)",
 377                        nas, ut.nas_port, status);
 378                 return RLM_MODULE_NOOP;
 379         }
 380
 381         /*
 382          *      Translate the User-Name attribute, or whatever else
 383          *      they told us to use.
 384          */
 385         *buffer = '\0';
 386         radius_xlat(buffer, sizeof(buffer), inst->username, request, NULL);
 387
 388         /*
 389          *  Copy the previous translated user name.
 390          */
 391         strlcpy(ut.login, buffer, RUT_NAMESIZE);
 392
 393         /*
 394          *      Perhaps we don't want to store this record into
 395          *      radutmp. We skip records:
 396          *
 397          *      - without a NAS-Port (telnet / tcp access)
 398          *      - with the username "!root" (console admin login)
 399          */
 400         if (!port_seen) {
 401                 DEBUG2("  rlm_radutmp: No NAS-Port seen.  Cannot do anything.");
 402                 DEBUG2("  rlm_radumtp: WARNING: checkrad will probably not work!");
 403                 return RLM_MODULE_NOOP;
 404         }
 405
 406         if (strncmp(ut.login, "!root", RUT_NAMESIZE) == 0) {
 407                 DEBUG2("  rlm_radutmp: Not recording administrative user");
 408
 409                 return RLM_MODULE_NOOP;
 410         }
 411
 412         /*
 413          *      Enter into the radutmp file.
 414          */
 415         fd = open(filename, O_RDWR|O_CREAT, inst->permission);
 416         if (fd < 0) {
 417                 radlog(L_ERR, "rlm_radutmp: Error accessing file %s: %s",
 418                        filename, strerror(errno));
 419                 return RLM_MODULE_FAIL;
 420         }
 421
 422         /*
 423          *      Lock the utmp file, prefer lockf() over flock().
 424          */
 425         rad_lockfd(fd, LOCK_LEN);
 426
 427         /*
 428          *      Find the entry for this NAS / portno combination.
 429          */
 430         if ((cache = nas_port_find(inst->nas_port_list, ut.nas_address,
 431                                    ut.nas_port)) != NULL) {
 432                 lseek(fd, (off_t)cache->offset, SEEK_SET);
 433         }
 434
 435         r = 0;
 436         off = 0;
 437         while (read(fd, &u, sizeof(u)) == sizeof(u)) {
 438                 off += sizeof(u);
 439                 if (u.nas_address != ut.nas_address ||
 440                     u.nas_port    != ut.nas_port)
 441                         continue;
 442
 443                 /*
 444                  *      Don't compare stop records to unused entries.
 445                  */
 446                 if (status == PW_STATUS_STOP &&
 447                     u.type == P_IDLE) {
 448                         continue;
 449                 }
 450
 451                 if (status == PW_STATUS_STOP &&
 452                     strncmp(ut.session_id, u.session_id,
 453                             sizeof(u.session_id)) != 0) {
 454                         /*
 455                          *      Don't complain if this is not a
 456                          *      login record (some clients can
 457                          *      send _only_ logout records).
 458                          */
 459                         if (u.type == P_LOGIN)
 460                                 radlog(L_ERR, "rlm_radutmp: Logout entry for NAS %s port %u has wrong ID",
 461                                        nas, u.nas_port);
 462                         r = -1;
 463                         break;
 464                 }
 465
 466                 if (status == PW_STATUS_START &&
 467                     strncmp(ut.session_id, u.session_id,
 468                             sizeof(u.session_id)) == 0  &&
 469                     u.time >= ut.time) {
 470                         if (u.type == P_LOGIN) {
 471                                 radlog(L_INFO, "rlm_radutmp: Login entry for NAS %s port %u duplicate",
 472                                        nas, u.nas_port);
 473                                 r = -1;
 474                                 break;
 475                         }
 476                         radlog(L_ERR, "rlm_radutmp: Login entry for NAS %s port %u wrong order",
 477                                nas, u.nas_port);
 478                         r = -1;
 479                         break;
 480                 }
 481
 482                 /*
 483                  *      FIXME: the ALIVE record could need
 484                  *      some more checking, but anyway I'd
 485                  *      rather rewrite this mess -- miquels.
 486                  */
 487                 if (status == PW_STATUS_ALIVE &&
 488                     strncmp(ut.session_id, u.session_id,
 489                             sizeof(u.session_id)) == 0  &&
 490                     u.type == P_LOGIN) {
 491                         /*
 492                          *      Keep the original login time.
 493                          */
 494                         ut.time = u.time;
 495                 }
 496
 497                 if (lseek(fd, -(off_t)sizeof(u), SEEK_CUR) < 0) {
 498                         radlog(L_ERR, "rlm_radutmp: negative lseek!");
 499                         lseek(fd, (off_t)0, SEEK_SET);
 500                         off = 0;
 501                 } else
 502                         off -= sizeof(u);
 503                 r = 1;
 504                 break;
 505         } /* read the file until we find a match */
 506
 507         /*
 508          *      Found the entry, do start/update it with
 509          *      the information from the packet.
 510          */
 511         if (r >= 0 &&  (status == PW_STATUS_START ||
 512                         status == PW_STATUS_ALIVE)) {
 513                 /*
 514                  *      Remember where the entry was, because it's
 515                  *      easier than searching through the entire file.
 516                  */
 517                 if (cache == NULL) {
 518                         cache = rad_malloc(sizeof(NAS_PORT));
 519                         cache->nasaddr = ut.nas_address;
 520                         cache->port = ut.nas_port;
 521                         cache->offset = off;
 522                         cache->next = inst->nas_port_list;
 523                         inst->nas_port_list = cache;
 524                 }
 525
 526                 ut.type = P_LOGIN;
 527                 write(fd, &ut, sizeof(u));
 528         }
 529
 530         /*
 531          *      The user has logged off, delete the entry by
 532          *      re-writing it in place.
 533          */
 534         if (status == PW_STATUS_STOP) {
 535                 if (r > 0) {
 536                         u.type = P_IDLE;
 537                         u.time = ut.time;
 538                         u.delay = ut.delay;
 539                         write(fd, &u, sizeof(u));
 540                 } else if (r == 0) {
 541                         radlog(L_ERR, "rlm_radutmp: Logout for NAS %s port %u, but no Login record",
 542                                nas, ut.nas_port);
 543                 }
 544         }
 545         close(fd);      /* and implicitely release the locks */
 546
 547         return RLM_MODULE_OK;
 548 }
 549 #endif
 550
 551 #ifdef WITH_SESSION_MGMT
 552 /*
 553  *      See if a user is already logged in. Sets request->simul_count to the
 554  *      current session count for this user and sets request->simul_mpp to 2
 555  *      if it looks like a multilink attempt based on the requested IP
 556  *      address, otherwise leaves request->simul_mpp alone.
 557  *
 558  *      Check twice. If on the first pass the user exceeds his
 559  *      max. number of logins, do a second pass and validate all
 560  *      logins by querying the terminal server (using eg. SNMP).
 561  */
 562 static int radutmp_checksimul(void *instance, REQUEST *request)
 563 {
 564         struct radutmp  u;
 565         int             fd;
 566         VALUE_PAIR      *vp;
 567         uint32_t        ipno = 0;
 568         char            *call_num = NULL;
 569         int             rcode;
 570         rlm_radutmp_t   *inst = instance;
 571         char            login[256];
 572         char            filename[1024];
 573
 574         /*
 575          *      Get the filename, via xlat.
 576          */
 577         radius_xlat(filename, sizeof(filename), inst->filename, request, NULL);
 578
 579         if ((fd = open(filename, O_RDWR)) < 0) {
 580                 /*
 581                  *      If the file doesn't exist, then no users
 582                  *      are logged in.
 583                  */
 584                 if (errno == ENOENT) {
 585                         request->simul_count=0;
 586                         return RLM_MODULE_OK;
 587                 }
 588
 589                 /*
 590                  *      Error accessing the file.
 591                  */
 592                 radlog(L_ERR, "rlm_radumtp: Error accessing file %s: %s",
 593                        filename, strerror(errno));
 594                 return RLM_MODULE_FAIL;
 595         }
 596
 597         *login = '\0';
 598         radius_xlat(login, sizeof(login), inst->username, request, NULL);
 599         if (!*login) {
 600                 return RLM_MODULE_NOOP;
 601         }
 602
 603         /*
 604          *      WTF?  This is probably wrong... we probably want to
 605          *      be able to check users across multiple session accounting
 606          *      methods.
 607          */
 608         request->simul_count = 0;
 609
 610         /*
 611          *      Loop over utmp, counting how many people MAY be logged in.
 612          */
 613         while (read(fd, &u, sizeof(u)) == sizeof(u)) {
 614                 if (((strncmp(login, u.login, RUT_NAMESIZE) == 0) ||
 615                      (!inst->case_sensitive &&
 616                       (strncasecmp(login, u.login, RUT_NAMESIZE) == 0))) &&
 617                     (u.type == P_LOGIN)) {
 618                         ++request->simul_count;
 619                 }
 620         }
 621
 622         /*
 623          *      The number of users logged in is OK,
 624          *      OR, we've been told to not check the NAS.
 625          */
 626         if ((request->simul_count < request->simul_max) ||
 627             !inst->check_nas) {
 628                 close(fd);
 629                 return RLM_MODULE_OK;
 630         }
 631         lseek(fd, (off_t)0, SEEK_SET);
 632
 633         /*
 634          *      Setup some stuff, like for MPP detection.
 635          */
 636         if ((vp = pairfind(request->packet->vps, PW_FRAMED_IP_ADDRESS, 0)) != NULL)
 637                 ipno = vp->vp_ipaddr;
 638         if ((vp = pairfind(request->packet->vps, PW_CALLING_STATION_ID, 0)) != NULL)
 639                 call_num = vp->vp_strvalue;
 640
 641         /*
 642          *      lock the file while reading/writing.
 643          */
 644         rad_lockfd(fd, LOCK_LEN);
 645
 646         /*
 647          *      FIXME: If we get a 'Start' for a user/nas/port which is
 648          *      listed, but for which we did NOT get a 'Stop', then
 649          *      it's not a duplicate session.  This happens with
 650          *      static IP's like DSL.
 651          */
 652         request->simul_count = 0;
 653         while (read(fd, &u, sizeof(u)) == sizeof(u)) {
 654                 if (((strncmp(login, u.login, RUT_NAMESIZE) == 0) ||
 655                      (!inst->case_sensitive &&
 656                       (strncasecmp(login, u.login, RUT_NAMESIZE) == 0))) &&
 657                     (u.type == P_LOGIN)) {
 658                         char session_id[sizeof(u.session_id) + 1];
 659                         char utmp_login[sizeof(u.login) + 1];
 660
 661                         strlcpy(session_id, u.session_id, sizeof(session_id));
 662
 663                         /*
 664                          *      The login name MAY fill the whole field,
 665                          *      and thus won't be zero-filled.
 666                          *
 667                          *      Note that we take the user name from
 668                          *      the utmp file, as that's the canonical
 669                          *      form.  The 'login' variable may contain
 670                          *      a string which is an upper/lowercase
 671                          *      version of u.login.  When we call the
 672                          *      routine to check the terminal server,
 673                          *      the NAS may be case sensitive.
 674                          *
 675                          *      e.g. We ask if "bob" is using a port,
 676                          *      and the NAS says "no", because "BOB"
 677                          *      is using the port.
 678                          */
 679                         strlcpy(utmp_login, u.login, sizeof(u.login));
 680
 681                         /*
 682                          *      rad_check_ts may take seconds
 683                          *      to return, and we don't want
 684                          *      to block everyone else while
 685                          *      that's happening.  */
 686                         rad_unlockfd(fd, LOCK_LEN);
 687                         rcode = rad_check_ts(u.nas_address, u.nas_port,
 688                                              utmp_login, session_id);
 689                         rad_lockfd(fd, LOCK_LEN);
 690
 691                         if (rcode == 0) {
 692                                 /*
 693                                  *      Stale record - zap it.
 694                                  */
 695                                 session_zap(request, u.nas_address,
 696                                             u.nas_port, login, session_id,
 697                                             u.framed_address, u.proto,0);
 698                         }
 699                         else if (rcode == 1) {
 700                                 /*
 701                                  *      User is still logged in.
 702                                  */
 703                                 ++request->simul_count;
 704
 705                                 /*
 706                                  *      Does it look like a MPP attempt?
 707                                  */
 708                                 if (strchr("SCPA", u.proto) &&
 709                                     ipno && u.framed_address == ipno)
 710                                         request->simul_mpp = 2;
 711                                 else if (strchr("SCPA", u.proto) && call_num &&
 712                                         !strncmp(u.caller_id,call_num,16))
 713                                         request->simul_mpp = 2;
 714                         }
 715                         else {
 716                                 /*
 717                                  *      Failed to check the terminal
 718                                  *      server for duplicate logins:
 719                                  *      Return an error.
 720                                  */
 721                                 close(fd);
 722                                 radlog(L_ERR, "rlm_radutmp: Failed to check the terminal server for user '%s'.", utmp_login);
 723                                 return RLM_MODULE_FAIL;
 724                         }
 725                 }
 726         }
 727         close(fd);              /* and implicitely release the locks */
 728
 729         return RLM_MODULE_OK;
 730 }
 731 #endif
 732
 733 /* globally exported name */
 734 module_t rlm_radutmp = {
 735         RLM_MODULE_INIT,
 736         "radutmp",
 737         RLM_TYPE_CHECK_CONFIG_SAFE | RLM_TYPE_HUP_SAFE,         /* type */
 738         radutmp_instantiate,          /* instantiation */
 739         radutmp_detach,               /* detach */
 740         {
 741                 NULL,                 /* authentication */
 742                 NULL,                 /* authorization */
 743                 NULL,                 /* preaccounting */
 744 #ifdef WITH_ACCOUNTING
 745                 radutmp_accounting,   /* accounting */
 746 #else
 747                 NULL,
 748 #endif
 749 #ifdef WITH_SESSION_MGMT
 750                 radutmp_checksimul,     /* checksimul */
 751 #else
 752                 NULL,
 753 #endif
 754                 NULL,                   /* pre-proxy */
 755                 NULL,                   /* post-proxy */
 756                 NULL                    /* post-auth */
 757         },
 758 };
 759