src/modules/rlm_ippool/rlm_ippool.c

   1 /*
   2  * rlm_ippool.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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  19  *
  20  * Copyright 2001  The FreeRADIUS server project
  21  * Copyright 2002  Kostas Kalevras <kkalev@noc.ntua.gr>
  22  *
  23  * March 2002, Kostas Kalevras <kkalev@noc.ntua.gr>
  24  * - Initial release
  25  * April 2002, Kostas Kalevras <kkalev@noc.ntua.gr>
  26  * - Add support for the Pool-Name attribute
  27  * May 2002, Kostas Kalevras <kkalev@noc.ntua.gr>
  28  * - Check the return value of a gdbm_fetch() we didn't check
  29  * - Change the nas entry in the ippool_key structure from uint32 to string[64]
  30  *   That should allow us to also use the NAS-Identifier attribute
  31  * Sep 2002, Kostas Kalevras <kkalev@noc.ntua.gr>
  32  * - Move from authorize to post-auth
  33  * - Use mutex locks when accessing the gdbm files
  34  * - Fail if we don't find nas port information
  35  * Oct 2002, Kostas Kalevras <kkalev@noc.ntua.gr>
  36  * - Do a memset(0) on the key.nas before doing searches. Nusty bug
  37  */
  38
  39 #include "config.h"
  40 #include "autoconf.h"
  41 #include "libradius.h"
  42
  43 #include <stdio.h>
  44 #include <stdlib.h>
  45 #include <string.h>
  46 #include <ctype.h>
  47
  48 #include "radiusd.h"
  49 #include "modules.h"
  50 #include "conffile.h"
  51
  52 #include <gdbm.h>
  53 #include <time.h>
  54 #include <netinet/in.h>
  55
  56 #ifdef NEEDS_GDBM_SYNC
  57 #       define GDBM_SYNCOPT GDBM_SYNC
  58 #else
  59 #       define GDBM_SYNCOPT 0
  60 #endif
  61
  62 #ifdef GDBM_NOLOCK
  63 #define GDBM_IPPOOL_OPTS (GDBM_SYNCOPT | GDBM_NOLOCK)
  64 #else
  65 #define GDBM_IPPOOL_OPTS (GDBM_SYNCOPT)
  66 #endif
  67
  68 #define ALL_ONES 4294967295
  69 #define MAX_NAS_NAME_SIZE 64
  70
  71 static const char rcsid[] = "$Id$";
  72
  73 /*
  74  *      Define a structure for our module configuration.
  75  *
  76  *      These variables do not need to be in a structure, but it's
  77  *      a lot cleaner to do so, and a pointer to the structure can
  78  *      be used as the instance handle.
  79  */
  80 typedef struct rlm_ippool_t {
  81         char *session_db;
  82         char *ip_index;
  83         char *name;
  84         uint32_t range_start;
  85         uint32_t range_stop;
  86         uint32_t netmask;
  87         int cache_size;
  88         GDBM_FILE gdbm;
  89         GDBM_FILE ip;
  90         pthread_mutex_t session_mutex;
  91         pthread_mutex_t ip_mutex;
  92 } rlm_ippool_t;
  93
  94 typedef struct ippool_info {
  95         uint32_t        ipaddr;
  96         char            active;
  97         char            cli[32];
  98 } ippool_info;
  99
 100 typedef struct ippool_key {
 101         char nas[MAX_NAS_NAME_SIZE];
 102         int port;
 103 } ippool_key;
 104
 105 /*
 106  *      A mapping of configuration file names to internal variables.
 107  *
 108  *      Note that the string is dynamically allocated, so it MUST
 109  *      be freed.  When the configuration file parse re-reads the string,
 110  *      it free's the old one, and strdup's the new one, placing the pointer
 111  *      to the strdup'd string into 'config.string'.  This gets around
 112  *      buffer over-flows.
 113  */
 114 static CONF_PARSER module_config[] = {
 115   { "session-db", PW_TYPE_STRING_PTR, offsetof(rlm_ippool_t,session_db), NULL, NULL },
 116   { "ip-index", PW_TYPE_STRING_PTR, offsetof(rlm_ippool_t,ip_index), NULL, NULL },
 117   { "range-start", PW_TYPE_IPADDR, offsetof(rlm_ippool_t,range_start), NULL, "0" },
 118   { "range-stop", PW_TYPE_IPADDR, offsetof(rlm_ippool_t,range_stop), NULL, "0" },
 119   { "netmask", PW_TYPE_IPADDR, offsetof(rlm_ippool_t,netmask), NULL, "0" },
 120   { "cache-size", PW_TYPE_INTEGER, offsetof(rlm_ippool_t,cache_size), NULL, "1000" },
 121   { NULL, -1, 0, NULL, NULL }
 122 };
 123
 124
 125 /*
 126  *      Do any per-module initialization that is separate to each
 127  *      configured instance of the module.  e.g. set up connections
 128  *      to external databases, read configuration files, set up
 129  *      dictionary entries, etc.
 130  *
 131  *      If configuration information is given in the config section
 132  *      that must be referenced in later calls, store a handle to it
 133  *      in *instance otherwise put a null pointer there.
 134  */
 135 static int ippool_instantiate(CONF_SECTION *conf, void **instance)
 136 {
 137         rlm_ippool_t *data;
 138         int cache_size;
 139         ippool_info entry;
 140         ippool_key key;
 141         datum key_datum;
 142         datum data_datum;
 143         int i,j;
 144         const char *cli = "0";
 145         char *pool_name = NULL;
 146
 147         /*
 148          *      Set up a storage area for instance data
 149          */
 150         data = rad_malloc(sizeof(*data));
 151
 152         /*
 153          *      If the configuration parameters can't be parsed, then
 154          *      fail.
 155          */
 156         if (cf_section_parse(conf, data, module_config) < 0) {
 157                 free(data);
 158                 return -1;
 159         }
 160         cache_size = data->cache_size;
 161
 162         if (data->session_db == NULL) {
 163                 radlog(L_ERR, "rlm_ippool: 'session-db' must be set.");
 164                 free(data);
 165                 return -1;
 166         }
 167         if (data->ip_index == NULL) {
 168                 radlog(L_ERR, "rlm_ippool: 'ip-index' must be set.");
 169                 free(data);
 170                 return -1;
 171         }
 172         data->range_start = htonl(data->range_start);
 173         data->range_stop = htonl(data->range_stop);
 174         data->netmask = htonl(data->netmask);
 175         if (data->range_start == 0 || data->range_stop == 0 || \
 176                          data->range_start >= data->range_stop ) {
 177                 radlog(L_ERR, "rlm_ippool: Invalid configuration data given.");
 178                 free(data);
 179                 return -1;
 180         }
 181
 182         data->gdbm = gdbm_open(data->session_db, sizeof(int),
 183                         GDBM_WRCREAT | GDBM_IPPOOL_OPTS, 0600, NULL);
 184         if (data->gdbm == NULL) {
 185                 radlog(L_ERR, "rlm_ippool: Failed to open file %s: %s",
 186                                 data->session_db, strerror(errno));
 187                 return -1;
 188         }
 189         data->ip = gdbm_open(data->ip_index, sizeof(int),
 190                         GDBM_WRCREAT | GDBM_IPPOOL_OPTS, 0600, NULL);
 191         if (data->ip == NULL) {
 192                 radlog(L_ERR, "rlm_ippool: Failed to open file %s: %s",
 193                                 data->ip_index, strerror(errno));
 194                 return -1;
 195         }
 196         if (gdbm_setopt(data->gdbm, GDBM_CACHESIZE, &cache_size, sizeof(int)) == -1)
 197                 radlog(L_ERR, "rlm_ippool: Failed to set cache size");
 198         if (gdbm_setopt(data->ip, GDBM_CACHESIZE, &cache_size, sizeof(int)) == -1)
 199                 radlog(L_ERR, "rlm_ippool: Failed to set cache size");
 200
 201         key_datum = gdbm_firstkey(data->gdbm);
 202         if (key_datum.dptr == NULL){
 203                         /*
 204                          * If the database does not exist initialize it.
 205                          * We set the nas/port pairs to not existent values and
 206                          * active = 0
 207                          */
 208                 int rcode;
 209                 uint32_t or_result;
 210                 char str[32];
 211                 const char *nas_init = "NOT_EXIST";
 212
 213                 DEBUG("rlm_ippool: Initializing database");
 214                 for(i=data->range_start,j=-1;i<=data->range_stop;i++,j--){
 215
 216                         /*
 217                          * Net and Broadcast addresses are excluded
 218                          */
 219                         or_result = i | data->netmask;
 220                         if (or_result == data->netmask || or_result == ALL_ONES){
 221                                 DEBUG("rlm_ippool: IP %s exlcluded",ip_ntoa(str,ntohl(i)));
 222                                 continue;
 223                         }
 224
 225                         strcpy(key.nas, nas_init);
 226                         key.port = j;
 227                         key_datum.dptr = (ippool_key *) &key;
 228                         key_datum.dsize = sizeof(ippool_key);
 229
 230                         entry.ipaddr = ntohl(i);
 231                         entry.active = 0;
 232                         strcpy(entry.cli,cli);
 233
 234                         data_datum.dptr = (ippool_info *) &entry;
 235                         data_datum.dsize = sizeof(ippool_info);
 236
 237                         rcode = gdbm_store(data->gdbm, key_datum, data_datum, GDBM_REPLACE);
 238                         if (rcode < 0) {
 239                                 radlog(L_ERR, "rlm_ippool: Failed storing data to %s: %s",
 240                                                 data->session_db, gdbm_strerror(gdbm_errno));
 241                                 free(data);
 242                                 gdbm_close(data->gdbm);
 243                                 gdbm_close(data->ip);
 244                                 return -1;
 245                         }
 246                 }
 247         }
 248         else
 249                 free(key_datum.dptr);
 250
 251         /* Add the ip pool name */
 252         data->name = NULL;
 253         pool_name = cf_section_name2(conf);
 254         if (pool_name != NULL)
 255                 data->name = strdup(pool_name);
 256         pthread_mutex_init(&data->session_mutex, NULL);
 257         pthread_mutex_init(&data->ip_mutex, NULL);
 258
 259         *instance = data;
 260
 261         return 0;
 262 }
 263
 264
 265 /*
 266  *      Check for an Accounting-Stop
 267  *      If we find one and we have allocated an IP to this nas/port combination, deallocate it.
 268  */
 269 static int ippool_accounting(void *instance, REQUEST *request)
 270 {
 271         rlm_ippool_t *data = (rlm_ippool_t *)instance;
 272         datum key_datum;
 273         datum data_datum;
 274         int acctstatustype = 0;
 275         int port = -1;
 276         int rcode;
 277         char nas[MAX_NAS_NAME_SIZE];
 278         ippool_info entry;
 279         ippool_key key;
 280         int num = 0;
 281         VALUE_PAIR *vp;
 282         char str[32];
 283
 284
 285         if ((vp = pairfind(request->packet->vps, PW_ACCT_STATUS_TYPE)) != NULL)
 286                 acctstatustype = vp->lvalue;
 287         else {
 288                 DEBUG("rlm_ippool: Could not find account status type in packet.");
 289                 return RLM_MODULE_NOOP;
 290         }
 291         switch(acctstatustype){
 292                 case PW_STATUS_STOP:
 293                         if ((vp = pairfind(request->packet->vps, PW_NAS_PORT_ID)) != NULL)
 294                                 port = vp->lvalue;
 295                         else {
 296                                 DEBUG("rlm_ippool: Could not find port number in packet.");
 297                                 return RLM_MODULE_NOOP;
 298                         }
 299                         if ((vp = pairfind(request->packet->vps, PW_NAS_IP_ADDRESS)) != NULL)
 300                                 strncpy(nas, vp->strvalue, MAX_NAS_NAME_SIZE - 1);
 301                         else {
 302                                 if ((vp = pairfind(request->packet->vps, PW_NAS_IDENTIFIER)) != NULL)
 303                                         strncpy(nas, vp->strvalue, MAX_NAS_NAME_SIZE - 1);
 304                                 else {
 305                                         DEBUG("rlm_ippool: Could not find nas information in packet.");
 306                                         return RLM_MODULE_NOOP;
 307                                 }
 308                         }
 309                         break;
 310                 default:
 311                         /* We don't care about any other accounting packet */
 312
 313                         return RLM_MODULE_NOOP;
 314         }
 315
 316         memset(key.nas,0,MAX_NAS_NAME_SIZE);
 317         strncpy(key.nas,nas,MAX_NAS_NAME_SIZE -1 );
 318         key.port = port;
 319         DEBUG("rlm_ippool: Searching for an entry for nas/port: %s/%d",key.nas,key.port);
 320         key_datum.dptr = (ippool_key *) &key;
 321         key_datum.dsize = sizeof(ippool_key);
 322
 323         pthread_mutex_lock(&data->session_mutex);
 324         data_datum = gdbm_fetch(data->gdbm, key_datum);
 325         pthread_mutex_unlock(&data->session_mutex);
 326         if (data_datum.dptr != NULL){
 327
 328                 /*
 329                  * If the entry was found set active to zero
 330                  */
 331                 memcpy(&entry, data_datum.dptr, sizeof(ippool_info));
 332                 free(data_datum.dptr);
 333                 DEBUG("rlm_ippool: Deallocated entry for ip/port: %s/%d",ip_ntoa(str,entry.ipaddr),port);
 334                 entry.active = 0;
 335
 336                 data_datum.dptr = (ippool_info *) &entry;
 337                 data_datum.dsize = sizeof(ippool_info);
 338
 339                 pthread_mutex_lock(&data->session_mutex);
 340                 rcode = gdbm_store(data->gdbm, key_datum, data_datum, GDBM_REPLACE);
 341                 pthread_mutex_unlock(&data->session_mutex);
 342                 if (rcode < 0) {
 343                         radlog(L_ERR, "rlm_ippool: Failed storing data to %s: %s",
 344                                         data->session_db, gdbm_strerror(gdbm_errno));
 345                         return RLM_MODULE_FAIL;
 346                 }
 347
 348                 /*
 349                  * Decrease allocated count from the ip index
 350                  */
 351                 key_datum.dptr = (uint32_t *) &entry.ipaddr;
 352                 key_datum.dsize = sizeof(uint32_t);
 353                 pthread_mutex_lock(&data->ip_mutex);
 354                 data_datum = gdbm_fetch(data->ip, key_datum);
 355                 pthread_mutex_unlock(&data->ip_mutex);
 356                 if (data_datum.dptr != NULL){
 357                         memcpy(&num, data_datum.dptr, sizeof(int));
 358                         free(data_datum.dptr);
 359                         if (num >0){
 360                                 num--;
 361                                 DEBUG("rlm_ippool: num: %d",num);
 362                                 data_datum.dptr = (int *) &num;
 363                                 data_datum.dsize = sizeof(int);
 364                                 pthread_mutex_lock(&data->ip_mutex);
 365                                 rcode = gdbm_store(data->ip, key_datum, data_datum, GDBM_REPLACE);
 366                                 pthread_mutex_unlock(&data->ip_mutex);
 367                                 if (rcode < 0) {
 368                                         radlog(L_ERR, "rlm_ippool: Failed storing data to %s: %s",
 369                                                         data->ip_index, gdbm_strerror(gdbm_errno));
 370                                         return RLM_MODULE_FAIL;
 371                                 }
 372                         }
 373                 }
 374         }
 375         else
 376                 DEBUG("rlm_ippool: Entry not found");
 377
 378         return RLM_MODULE_OK;
 379 }
 380
 381 static int ippool_postauth(void *instance, REQUEST *request)
 382 {
 383         rlm_ippool_t *data = (rlm_ippool_t *) instance;
 384         int port = 0;
 385         int delete = 0;
 386         int rcode;
 387         int num = 0;
 388         char nas[MAX_NAS_NAME_SIZE];
 389         datum key_datum;
 390         datum nextkey;
 391         datum data_datum;
 392         ippool_key key;
 393         ippool_info entry;
 394         VALUE_PAIR *vp;
 395         char *cli = NULL;
 396         char str[32];
 397
 398
 399         /* quiet the compiler */
 400         instance = instance;
 401         request = request;
 402
 403         /* Check if Pool-Name attribute exists. If it exists check our name and
 404          * run only if they match
 405          */
 406         if ((vp = pairfind(request->config_items, PW_POOL_NAME)) != NULL){
 407                 if (data->name == NULL || strcmp(data->name,vp->strvalue))
 408                         return RLM_MODULE_NOOP;
 409         } else {
 410                 DEBUG("rlm_ippool: Could not find Pool-Name attribute.");
 411                 return RLM_MODULE_NOOP;
 412         }
 413
 414         /*
 415          * Get the nas ip address
 416          * If not fail
 417          */
 418         if ((vp = pairfind(request->packet->vps, PW_NAS_IP_ADDRESS)) != NULL)
 419                 strncpy(nas, vp->strvalue, MAX_NAS_NAME_SIZE - 1);
 420         else{
 421                 if ((vp = pairfind(request->packet->vps, PW_NAS_IDENTIFIER)) != NULL)
 422                         strncpy(nas, vp->strvalue, MAX_NAS_NAME_SIZE - 1);
 423                 else{
 424                         DEBUG("rlm_ippool: Could not find nas information.");
 425                         return RLM_MODULE_NOOP;
 426                 }
 427         }
 428
 429         /*
 430          * Find the caller id
 431          */
 432         if ((vp = pairfind(request->packet->vps, PW_CALLING_STATION_ID)) != NULL)
 433                 cli = vp->strvalue;
 434
 435         /*
 436          * Find the port
 437          * If not fail
 438          */
 439         if ((vp = pairfind(request->packet->vps, PW_NAS_PORT_ID)) != NULL)
 440                 port = vp->lvalue;
 441         else{
 442                 DEBUG("rlm_ippool: Could not find port information.");
 443                 return RLM_MODULE_NOOP;
 444         }
 445
 446         memset(key.nas,0,MAX_NAS_NAME_SIZE);
 447         strncpy(key.nas,nas,MAX_NAS_NAME_SIZE -1 );
 448         key.port = port;
 449         DEBUG("rlm_ippool: Searching for an entry for nas/port: %s/%d",key.nas,key.port);
 450         key_datum.dptr = (ippool_key *) &key;
 451         key_datum.dsize = sizeof(ippool_key);
 452
 453         pthread_mutex_lock(&data->session_mutex);
 454         data_datum = gdbm_fetch(data->gdbm, key_datum);
 455         pthread_mutex_unlock(&data->session_mutex);
 456         if (data_datum.dptr != NULL){
 457                 /*
 458                  * If there is a corresponding entry in the database with active=1 it is stale.
 459                  * Set active to zero
 460                  */
 461                 memcpy(&entry, data_datum.dptr, sizeof(ippool_info));
 462                 free(data_datum.dptr);
 463                 if (entry.active){
 464                         DEBUG("rlm_ippool: Found a stale entry for ip/port: %s/%d",ip_ntoa(str,entry.ipaddr),port);
 465                         entry.active = 0;
 466
 467                         data_datum.dptr = (ippool_info *) &entry;
 468                         data_datum.dsize = sizeof(ippool_info);
 469
 470                         pthread_mutex_lock(&data->session_mutex);
 471                         rcode = gdbm_store(data->gdbm, key_datum, data_datum, GDBM_REPLACE);
 472                         pthread_mutex_unlock(&data->session_mutex);
 473                         if (rcode < 0) {
 474                                 radlog(L_ERR, "rlm_ippool: Failed storing data to %s: %s",
 475                                         data->session_db, gdbm_strerror(gdbm_errno));
 476                                 return RLM_MODULE_FAIL;
 477                         }
 478                         /* Decrease allocated count from the ip index */
 479
 480                         key_datum.dptr = (uint32_t *) &entry.ipaddr;
 481                         key_datum.dsize = sizeof(uint32_t);
 482                         pthread_mutex_lock(&data->ip_mutex);
 483                         data_datum = gdbm_fetch(data->ip, key_datum);
 484                         pthread_mutex_unlock(&data->ip_mutex);
 485                         if (data_datum.dptr != NULL){
 486                                 memcpy(&num, data_datum.dptr, sizeof(int));
 487                                 free(data_datum.dptr);
 488                                 if (num >0){
 489                                         num--;
 490                                         DEBUG("rlm_ippool: num: %d",num);
 491                                         data_datum.dptr = (int *) &num;
 492                                         data_datum.dsize = sizeof(int);
 493                                         pthread_mutex_lock(&data->ip_mutex);
 494                                         rcode = gdbm_store(data->ip, key_datum, data_datum, GDBM_REPLACE);
 495                                         pthread_mutex_unlock(&data->ip_mutex);
 496                                         if (rcode < 0) {
 497                                                 radlog(L_ERR, "rlm_ippool: Failed storing data to %s: %s",
 498                                                                 data->ip_index, gdbm_strerror(gdbm_errno));
 499                                                 return RLM_MODULE_FAIL;
 500                                         }
 501                                 }
 502                         }
 503                 }
 504         }
 505         /*
 506          * If there is a Framed-IP-Address attribute in the reply do nothing
 507          */
 508         if (pairfind(request->reply->vps, PW_FRAMED_IP_ADDRESS) != NULL)
 509                 return RLM_MODULE_NOOP;
 510
 511         /*
 512          * Walk through the database searching for an active=0 entry.
 513          */
 514
 515         pthread_mutex_lock(&data->session_mutex);
 516         key_datum = gdbm_firstkey(data->gdbm);
 517         while(key_datum.dptr){
 518                 data_datum = gdbm_fetch(data->gdbm, key_datum);
 519                 if (data_datum.dptr){
 520                         memcpy(&entry,data_datum.dptr, sizeof(ippool_info));
 521                         free(data_datum.dptr);
 522                         /*
 523                         * If we find an entry for the same caller-id and nas with active=1
 524                         * then we use that for multilink (MPPP) to work properly.
 525                         */
 526                         if (cli != NULL && strcmp(entry.cli,cli) == 0 && entry.active){
 527                                 memcpy(&key,key_datum.dptr,sizeof(ippool_key));
 528                                 if (!strcmp(key.nas,nas))
 529                                         break;
 530                         }
 531                         if (entry.active == 0){
 532                                 datum tmp;
 533
 534                                 tmp.dptr = (uint32_t *) &entry.ipaddr;
 535                                 tmp.dsize = sizeof(uint32_t);
 536                                 pthread_mutex_lock(&data->ip_mutex);
 537                                 data_datum = gdbm_fetch(data->ip, tmp);
 538                                 pthread_mutex_unlock(&data->ip_mutex);
 539
 540                                 /*
 541                                  * If we find an entry in the ip index and the number is zero (meaning
 542                                  * that we haven't allocated the same ip address to another nas/port pair)
 543                                  * or if we don't find an entry then delete the session entry so
 544                                  * that we can change the key (nas/port)
 545                                  * Else we don't delete the session entry since we haven't yet deallocated the
 546                                  * corresponding ip address and we continue our search.
 547                                  */
 548
 549                                 if (data_datum.dptr){
 550                                         memcpy(&num,data_datum.dptr, sizeof(int));
 551                                         free(data_datum.dptr);
 552                                         if (num == 0){
 553                                                 delete = 1;
 554                                                 break;
 555                                         }
 556                                 }
 557                                 else{
 558                                         delete = 1;
 559                                         break;
 560                                 }
 561                         }
 562                 }
 563                 nextkey = gdbm_nextkey(data->gdbm, key_datum);
 564                 free(key_datum.dptr);
 565                 key_datum = nextkey;
 566         }
 567         pthread_mutex_unlock(&data->session_mutex);
 568         /*
 569          * If we have found a free entry set active to 1 then add a Framed-IP-Address attribute to
 570          * the reply
 571          */
 572         if (key_datum.dptr){
 573                 entry.active = 1;
 574                 data_datum.dptr = (ippool_info *) &entry;
 575                 data_datum.dsize = sizeof(ippool_info);
 576
 577                 if (delete){
 578                         /*
 579                          * Delete the entry so that we can change the key
 580                          */
 581                         pthread_mutex_lock(&data->session_mutex);
 582                         gdbm_delete(data->gdbm, key_datum);
 583                         pthread_mutex_unlock(&data->session_mutex);
 584                 }
 585                 free(key_datum.dptr);
 586                 memset(key.nas,0,MAX_NAS_NAME_SIZE);
 587                 strncpy(key.nas,nas,MAX_NAS_NAME_SIZE - 1);
 588                 key.port = port;
 589                 key_datum.dptr = (ippool_key *) &key;
 590                 key_datum.dsize = sizeof(ippool_key);
 591
 592                 DEBUG2("rlm_ippool: Allocating ip to nas/port: %s/%d",key.nas,key.port);
 593                 pthread_mutex_lock(&data->session_mutex);
 594                 rcode = gdbm_store(data->gdbm, key_datum, data_datum, GDBM_REPLACE);
 595                 pthread_mutex_unlock(&data->session_mutex);
 596                 if (rcode < 0) {
 597                         radlog(L_ERR, "rlm_ippool: Failed storing data to %s: %s",
 598                                 data->session_db, gdbm_strerror(gdbm_errno));
 599                         return RLM_MODULE_FAIL;
 600                 }
 601
 602                 /* Increase the ip index count */
 603                 key_datum.dptr = (uint32_t *) &entry.ipaddr;
 604                 key_datum.dsize = sizeof(uint32_t);
 605                 pthread_mutex_lock(&data->ip_mutex);
 606                 data_datum = gdbm_fetch(data->ip, key_datum);
 607                 pthread_mutex_unlock(&data->ip_mutex);
 608                 if (data_datum.dptr){
 609                         memcpy(&num,data_datum.dptr,sizeof(int));
 610                         free(data_datum.dptr);
 611                 }
 612                 num++;
 613                 DEBUG("rlm_ippool: num: %d",num);
 614                 data_datum.dptr = (int *) &num;
 615                 data_datum.dsize = sizeof(int);
 616                 pthread_mutex_lock(&data->ip_mutex);
 617                 rcode = gdbm_store(data->ip, key_datum, data_datum, GDBM_REPLACE);
 618                 pthread_mutex_unlock(&data->ip_mutex);
 619                 if (rcode < 0) {
 620                         radlog(L_ERR, "rlm_ippool: Failed storing data to %s: %s",
 621                                 data->ip_index, gdbm_strerror(gdbm_errno));
 622                         return RLM_MODULE_FAIL;
 623                 }
 624
 625
 626                 DEBUG("rlm_ippool: Allocated ip %s to client on nas %s,port %d",ip_ntoa(str,entry.ipaddr),
 627                                 key.nas,port);
 628                 if ((vp = paircreate(PW_FRAMED_IP_ADDRESS, PW_TYPE_IPADDR)) == NULL) {
 629                         radlog(L_ERR|L_CONS, "no memory");
 630                         return RLM_MODULE_NOOP;
 631                 }
 632                 vp->lvalue = entry.ipaddr;
 633                 pairadd(&request->reply->vps, vp);
 634         }
 635         else{
 636                 DEBUG("rlm_ippool: No available ip addresses in pool.");
 637                 return RLM_MODULE_NOOP;
 638         }
 639
 640         return RLM_MODULE_OK;
 641 }
 642
 643 static int ippool_detach(void *instance)
 644 {
 645         rlm_ippool_t *data = (rlm_ippool_t *) instance;
 646
 647         gdbm_close(data->gdbm);
 648         gdbm_close(data->ip);
 649         free(data->session_db);
 650         free(data->ip_index);
 651         pthread_mutex_destroy(&data->session_mutex);
 652         pthread_mutex_destroy(&data->ip_mutex);
 653
 654         free(instance);
 655         return 0;
 656 }
 657
 658 /*
 659  *      The module name should be the only globally exported symbol.
 660  *      That is, everything else should be 'static'.
 661  *
 662  *      If the module needs to temporarily modify it's instantiation
 663  *      data, the type should be changed to RLM_TYPE_THREAD_UNSAFE.
 664  *      The server will then take care of ensuring that the module
 665  *      is single-threaded.
 666  */
 667 module_t rlm_ippool = {
 668         "IPPOOL",
 669         RLM_TYPE_THREAD_SAFE,           /* type */
 670         NULL,                           /* initialization */
 671         ippool_instantiate,             /* instantiation */
 672         {
 673                 NULL,                   /* authentication */
 674                 NULL,                   /* authorization */
 675                 NULL,                   /* preaccounting */
 676                 ippool_accounting,      /* accounting */
 677                 NULL,                   /* checksimul */
 678                 NULL,                   /* pre-proxy */
 679                 NULL,                   /* post-proxy */
 680                 ippool_postauth         /* post-auth */
 681         },
 682         ippool_detach,                  /* detach */
 683         NULL,                           /* destroy */
 684 };