src/modules/rlm_sqlcounter/rlm_sqlcounter.c

   1 /*
   2  * rlm_sqlcounter.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 2001  Alan DeKok <aland@ox.org>
  22  */
  23
  24 /* This module is based directly on the rlm_counter module */
  25
  26
  27 #include "autoconf.h"
  28 #include "libradius.h"
  29
  30 #include <stdio.h>
  31 #include <stdlib.h>
  32 #include <string.h>
  33 #include <ctype.h>
  34
  35 #include "radiusd.h"
  36 #include "modules.h"
  37 #include "conffile.h"
  38
  39 #define MAX_QUERY_LEN 1024
  40
  41 #include <time.h>
  42
  43
  44 /*      Note: When your counter spans more than 1 period (ie 3 months or 2 weeks), this module
  45  *      probably does NOT do what you want!  It calculates the range of dates to count across
  46  *      by first calculating the End of the Current period and then subtracting the number of
  47  *      periods you specify from that to determine the beginning of the range.
  48  *
  49  *      For example, if you specify a 3 month counter and today is June 15th, the end of the current
  50  *      period is June 30. Subtracting 3 months from that gives April 1st.  So, the counter will
  51  *      sum radacct entries from April 1st to June 30. Then, next month, it will sum entries
  52  *      from May 1st to July 31st.
  53  *
  54  *      To fix this behavior, we need to add some way of storing the Next Reset Time
  55  */
  56
  57
  58 static const char rcsid[] = "$Id$";
  59
  60 /*
  61  *      Define a structure for our module configuration.
  62  *
  63  *      These variables do not need to be in a structure, but it's
  64  *      a lot cleaner to do so, and a pointer to the structure can
  65  *      be used as the instance handle.
  66  */
  67 typedef struct rlm_sqlcounter_t {
  68         char *counter_name;     /* Daily-Session-Time */
  69         char *check_name;       /* Max-Daily-Session */
  70         char *key_name;         /* User-Name */
  71         char *sqlmod_inst;      /* instance of SQL module to use, usually just 'sql' */
  72         char *query;            /* SQL query to retrieve current session time */
  73         char *reset;            /* daily, weekly, monthly, never or user defined */
  74         char *allowed_chars;    /* safe characters list for SQL queries */
  75         time_t reset_time;
  76         time_t last_reset;
  77         int  key_attr;          /* attribute number for key field */
  78         int  dict_attr;         /* attribute number for the counter. */
  79 } rlm_sqlcounter_t;
  80
  81 /*
  82  *      A mapping of configuration file names to internal variables.
  83  *
  84  *      Note that the string is dynamically allocated, so it MUST
  85  *      be freed.  When the configuration file parse re-reads the string,
  86  *      it free's the old one, and strdup's the new one, placing the pointer
  87  *      to the strdup'd string into 'config.string'.  This gets around
  88  *      buffer over-flows.
  89  */
  90 static CONF_PARSER module_config[] = {
  91   { "counter-name", PW_TYPE_STRING_PTR, offsetof(rlm_sqlcounter_t,counter_name), NULL,  NULL },
  92   { "check-name", PW_TYPE_STRING_PTR, offsetof(rlm_sqlcounter_t,check_name), NULL, NULL },
  93   { "key", PW_TYPE_STRING_PTR, offsetof(rlm_sqlcounter_t,key_name), NULL, NULL },
  94   { "sqlmod-inst", PW_TYPE_STRING_PTR, offsetof(rlm_sqlcounter_t,sqlmod_inst), NULL, NULL },
  95   { "query", PW_TYPE_STRING_PTR, offsetof(rlm_sqlcounter_t,query), NULL, NULL },
  96   { "reset", PW_TYPE_STRING_PTR, offsetof(rlm_sqlcounter_t,reset), NULL,  NULL },
  97   { "safe-characters", PW_TYPE_STRING_PTR, offsetof(rlm_sqlcounter_t,allowed_chars), NULL, "@abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789.-_: /"},
  98   { NULL, -1, 0, NULL, NULL }
  99 };
 100
 101 static char *allowed_chars = NULL;
 102
 103 /*
 104  *      Translate the SQL queries.
 105  */
 106 static int sql_escape_func(char *out, int outlen, const char *in)
 107 {
 108         int len = 0;
 109
 110         while (in[0]) {
 111                 /*
 112                  *      Non-printable characters get replaced with their
 113                  *      mime-encoded equivalents.
 114                  */
 115                 if ((in[0] < 32) ||
 116                     strchr(allowed_chars, *in) == NULL) {
 117                         /*
 118                          *      Only 3 or less bytes available.
 119                          */
 120                         if (outlen <= 3) {
 121                                 break;
 122                         }
 123
 124                         snprintf(out, outlen, "=%02X", (unsigned char) in[0]);
 125                         in++;
 126                         out += 3;
 127                         outlen -= 3;
 128                         len += 3;
 129                         continue;
 130                 }
 131
 132                 /*
 133                  *      Only one byte left.
 134                  */
 135                 if (outlen <= 1) {
 136                         break;
 137                 }
 138
 139                 /*
 140                  *      Allowed character.
 141                  */
 142                 *out = *in;
 143                 out++;
 144                 in++;
 145                 outlen--;
 146                 len++;
 147         }
 148         *out = '\0';
 149         return len;
 150 }
 151
 152 static int find_next_reset(rlm_sqlcounter_t *data, time_t timeval)
 153 {
 154         int ret=0;
 155         unsigned int num=1;
 156         char last = 0;
 157         struct tm *tm, s_tm;
 158         char sCurrentTime[40], sNextTime[40];
 159
 160         tm = localtime_r(&timeval, &s_tm);
 161         strftime(sCurrentTime, sizeof(sCurrentTime),"%Y-%m-%d %H:%M:%S",tm);
 162         tm->tm_sec = tm->tm_min = 0;
 163
 164         if (data->reset == NULL)
 165                 return -1;
 166         if (isdigit((int) data->reset[0])){
 167                 unsigned int len=0;
 168
 169                 len = strlen(data->reset);
 170                 if (len == 0)
 171                         return -1;
 172                 last = data->reset[len - 1];
 173                 if (!isalpha((int) last))
 174                         last = 'd';
 175 /*              num = atoi(data->reset); */
 176                 DEBUG("rlm_sqlcounter: num=%d, last=%c",num,last);
 177         }
 178         if (strcmp(data->reset, "hourly") == 0 || last == 'h') {
 179                 /*
 180                  *  Round up to the next nearest hour.
 181                  */
 182                 tm->tm_hour += num;
 183                 data->reset_time = mktime(tm);
 184         } else if (strcmp(data->reset, "daily") == 0 || last == 'd') {
 185                 /*
 186                  *  Round up to the next nearest day.
 187                  */
 188                 tm->tm_hour = 0;
 189                 tm->tm_mday += num;
 190                 data->reset_time = mktime(tm);
 191         } else if (strcmp(data->reset, "weekly") == 0 || last == 'w') {
 192                 /*
 193                  *  Round up to the next nearest week.
 194                  */
 195                 tm->tm_hour = 0;
 196                 tm->tm_mday += (7 - tm->tm_wday) +(7*(num-1));
 197                 data->reset_time = mktime(tm);
 198         } else if (strcmp(data->reset, "monthly") == 0 || last == 'm') {
 199                 tm->tm_hour = 0;
 200                 tm->tm_mday = 1;
 201                 tm->tm_mon += num;
 202                 data->reset_time = mktime(tm);
 203         } else if (strcmp(data->reset, "never") == 0) {
 204                 data->reset_time = 0;
 205         } else {
 206                 radlog(L_ERR, "rlm_sqlcounter: Unknown reset timer \"%s\"",
 207                         data->reset);
 208                 return -1;
 209         }
 210         strftime(sNextTime, sizeof(sNextTime),"%Y-%m-%d %H:%M:%S",tm);
 211         DEBUG2("rlm_sqlcounter: Current Time: %d [%s], Next reset %d [%s]",
 212                 (int)timeval,sCurrentTime,(int)data->reset_time, sNextTime);
 213
 214         return ret;
 215 }
 216
 217
 218 /*  I don't believe that this routine handles Daylight Saving Time adjustments
 219     properly.  Any suggestions?
 220 */
 221
 222 static int find_prev_reset(rlm_sqlcounter_t *data, time_t timeval)
 223 {
 224         int ret=0;
 225         unsigned int num=1;
 226         char last = 0;
 227         struct tm *tm, s_tm;
 228         char sCurrentTime[40], sPrevTime[40];
 229
 230         tm = localtime_r(&timeval, &s_tm);
 231         strftime(sCurrentTime, sizeof(sCurrentTime),"%Y-%m-%d %H:%M:%S",tm);
 232         tm->tm_sec = tm->tm_min = 0;
 233
 234         if (data->reset == NULL)
 235                 return -1;
 236         if (isdigit((int) data->reset[0])){
 237                 unsigned int len=0;
 238
 239                 len = strlen(data->reset);
 240                 if (len == 0)
 241                         return -1;
 242                 last = data->reset[len - 1];
 243                 if (!isalpha((int) last))
 244                         last = 'd';
 245                 num = atoi(data->reset);
 246                 DEBUG("rlm_sqlcounter: num=%d, last=%c",num,last);
 247         }
 248         if (strcmp(data->reset, "hourly") == 0 || last == 'h') {
 249                 /*
 250                  *  Round down to the prev nearest hour.
 251                  */
 252                 tm->tm_hour -= num - 1;
 253                 data->last_reset = mktime(tm);
 254         } else if (strcmp(data->reset, "daily") == 0 || last == 'd') {
 255                 /*
 256                  *  Round down to the prev nearest day.
 257                  */
 258                 tm->tm_hour = 0;
 259                 tm->tm_mday -= num - 1;
 260                 data->last_reset = mktime(tm);
 261         } else if (strcmp(data->reset, "weekly") == 0 || last == 'w') {
 262                 /*
 263                  *  Round down to the prev nearest week.
 264                  */
 265                 tm->tm_hour = 0;
 266                 tm->tm_mday -= (7 - tm->tm_wday) +(7*(num-1));
 267                 data->last_reset = mktime(tm);
 268         } else if (strcmp(data->reset, "monthly") == 0 || last == 'm') {
 269                 tm->tm_hour = 0;
 270                 tm->tm_mday = 1;
 271                 tm->tm_mon -= num - 1;
 272                 data->last_reset = mktime(tm);
 273         } else if (strcmp(data->reset, "never") == 0) {
 274                 data->reset_time = 0;
 275         } else {
 276                 radlog(L_ERR, "rlm_sqlcounter: Unknown reset timer \"%s\"",
 277                         data->reset);
 278                 return -1;
 279         }
 280         strftime(sPrevTime, sizeof(sPrevTime),"%Y-%m-%d %H:%M:%S",tm);
 281         DEBUG2("rlm_sqlcounter: Current Time: %d [%s], Prev reset %d [%s]",
 282                 (int)timeval,sCurrentTime,(int)data->last_reset, sPrevTime);
 283
 284         return ret;
 285 }
 286
 287
 288 /*
 289  *      Replace %<whatever> in a string.
 290  *
 291  *      %b      last_reset
 292  *      %e      reset_time
 293  *      %k      key_name
 294  *      %S      sqlmod_inst
 295  *
 296  */
 297
 298 static int sqlcounter_expand(char *out, int outlen, const char *fmt, void *instance)
 299 {
 300         rlm_sqlcounter_t *data = (rlm_sqlcounter_t *) instance;
 301         int c,freespace;
 302         const char *p;
 303         char *q;
 304         char tmpdt[40]; /* For temporary storing of dates */
 305         int openbraces=0;
 306
 307         q = out;
 308         for (p = fmt; *p ; p++) {
 309         /* Calculate freespace in output */
 310         freespace = outlen - (q - out);
 311                 if (freespace <= 1)
 312                         break;
 313                 c = *p;
 314                 if ((c != '%') && (c != '$') && (c != '\\')) {
 315                         /*
 316                          * We check if we're inside an open brace.  If we are
 317                          * then we assume this brace is NOT literal, but is
 318                          * a closing brace and apply it
 319                          */
 320                         if((c == '}') && openbraces) {
 321                                 openbraces--;
 322                                 continue;
 323                         }
 324                         *q++ = *p;
 325                         continue;
 326                 }
 327                 if (*++p == '\0') break;
 328                 if (c == '\\') switch(*p) {
 329                         case '\\':
 330                                 *q++ = *p;
 331                                 break;
 332                         case 't':
 333                                 *q++ = '\t';
 334                                 break;
 335                         case 'n':
 336                                 *q++ = '\n';
 337                                 break;
 338                         default:
 339                                 *q++ = c;
 340                                 *q++ = *p;
 341                                 break;
 342
 343                 } else if (c == '%') switch(*p) {
 344
 345                         case '%':
 346                                 *q++ = *p;
 347                         case 'b': /* last_reset */
 348                                 snprintf(tmpdt, sizeof(tmpdt), "%lu", data->last_reset);
 349                                 strNcpy(q, tmpdt, freespace);
 350                                 q += strlen(q);
 351                                 break;
 352                         case 'e': /* reset_time */
 353                                 snprintf(tmpdt, sizeof(tmpdt), "%lu", data->reset_time);
 354                                 strNcpy(q, tmpdt, freespace);
 355                                 q += strlen(q);
 356                                 break;
 357                         case 'k': /* Key Name */
 358                                 strNcpy(q, data->key_name, freespace);
 359                                 q += strlen(q);
 360                                 break;
 361                         case 'S': /* SQL module instance */
 362                                 strNcpy(q, data->sqlmod_inst, freespace);
 363                                 q += strlen(q);
 364                                 break;
 365                         default:
 366                                 *q++ = '%';
 367                                 *q++ = *p;
 368                                 break;
 369                 }
 370         }
 371         *q = '\0';
 372
 373         DEBUG2("sqlcounter_expand:  '%s'", out);
 374
 375         return strlen(out);
 376 }
 377
 378
 379 /*
 380  *      See if the counter matches.
 381  */
 382 static int sqlcounter_cmp(void *instance, REQUEST *req, VALUE_PAIR *request, VALUE_PAIR *check,
 383                 VALUE_PAIR *check_pairs, VALUE_PAIR **reply_pairs)
 384 {
 385         rlm_sqlcounter_t *data = (rlm_sqlcounter_t *) instance;
 386         int counter;
 387         char querystr[MAX_QUERY_LEN];
 388         char responsestr[MAX_QUERY_LEN];
 389
 390         check_pairs = check_pairs; /* shut the compiler up */
 391         reply_pairs = reply_pairs;
 392
 393         /* first, expand %k, %b and %e in query */
 394         sqlcounter_expand(querystr, MAX_QUERY_LEN, data->query, instance);
 395
 396         /* second, xlat any request attribs in query */
 397         radius_xlat(responsestr, MAX_QUERY_LEN, querystr, req, sql_escape_func);
 398
 399         /* third, wrap query with sql module call & expand */
 400         snprintf(querystr, sizeof(querystr), "%%{%%S:%s}", responsestr);
 401         sqlcounter_expand(responsestr, MAX_QUERY_LEN, querystr, instance);
 402
 403         /* Finally, xlat resulting SQL query */
 404         radius_xlat(querystr, MAX_QUERY_LEN, responsestr, req, sql_escape_func);
 405
 406         counter = atoi(querystr);
 407
 408         return counter - check->lvalue;
 409 }
 410
 411
 412 /*
 413  *      Do any per-module initialization that is separate to each
 414  *      configured instance of the module.  e.g. set up connections
 415  *      to external databases, read configuration files, set up
 416  *      dictionary entries, etc.
 417  *
 418  *      If configuration information is given in the config section
 419  *      that must be referenced in later calls, store a handle to it
 420  *      in *instance otherwise put a null pointer there.
 421  */
 422 static int sqlcounter_instantiate(CONF_SECTION *conf, void **instance)
 423 {
 424         rlm_sqlcounter_t *data;
 425         DICT_ATTR *dattr;
 426         ATTR_FLAGS flags;
 427         time_t now;
 428         char buffer[MAX_STRING_LEN];
 429
 430         /*
 431          *      Set up a storage area for instance data
 432          */
 433         data = rad_malloc(sizeof(*data));
 434         if (!data) {
 435                 return -1;
 436         }
 437         memset(data, 0, sizeof(*data));
 438
 439         /*
 440          *      If the configuration parameters can't be parsed, then
 441          *      fail.
 442          */
 443         if (cf_section_parse(conf, data, module_config) < 0) {
 444                 free(data);
 445                 return -1;
 446         }
 447
 448         /*
 449          *      No query, die.
 450          */
 451         if (data->query == NULL) {
 452                 radlog(L_ERR, "rlm_sqlcounter: 'query' must be set.");
 453                 return -1;
 454         }
 455
 456         /*
 457          *      Safe characters list for sql queries. Everything else is
 458          *      replaced rwith their mime-encoded equivalents.
 459          */
 460         allowed_chars = data->allowed_chars;
 461
 462         /*
 463          *      Discover the attribute number of the key.
 464          */
 465         if (data->key_name == NULL) {
 466                 radlog(L_ERR, "rlm_sqlcounter: 'key' must be set.");
 467                 return -1;
 468         }
 469         sql_escape_func(buffer, sizeof(buffer), data->key_name);
 470         if (strcmp(buffer, data->key_name) != 0) {
 471                 radlog(L_ERR, "rlm_sqlcounter: The value for option 'key' is too long or contains unsafe characters.");
 472                 return -1;
 473         }
 474         dattr = dict_attrbyname(data->key_name);
 475         if (dattr == NULL) {
 476                 radlog(L_ERR, "rlm_sqlcounter: No such attribute %s",
 477                                 data->key_name);
 478                 return -1;
 479         }
 480         data->key_attr = dattr->attr;
 481
 482         /*
 483          *      Check the "sqlmod-inst" option.
 484          */
 485         if (data->sqlmod_inst == NULL) {
 486                 radlog(L_ERR, "rlm_sqlcounter: 'sqlmod-inst' must be set.");
 487                 return -1;
 488         }
 489         sql_escape_func(buffer, sizeof(buffer), data->sqlmod_inst);
 490         if (strcmp(buffer, data->sqlmod_inst) != 0) {
 491                 radlog(L_ERR, "rlm_sqlcounter: The value for option 'sqlmod-inst' is too long or contains unsafe characters.");
 492                 return -1;
 493         }
 494
 495         /*
 496          *  Create a new attribute for the counter.
 497          */
 498         if (data->counter_name == NULL) {
 499                 radlog(L_ERR, "rlm_sqlcounter: 'counter-name' must be set.");
 500                 return -1;
 501         }
 502
 503         memset(&flags, 0, sizeof(flags));
 504         dict_addattr(data->counter_name, 0, PW_TYPE_INTEGER, -1, flags);
 505         dattr = dict_attrbyname(data->counter_name);
 506         if (dattr == NULL) {
 507                 radlog(L_ERR, "rlm_sqlcounter: Failed to create counter attribute %s",
 508                                 data->counter_name);
 509                 return -1;
 510         }
 511         data->dict_attr = dattr->attr;
 512         DEBUG2("rlm_sqlcounter: Counter attribute %s is number %d",
 513                         data->counter_name, data->dict_attr);
 514
 515         /*
 516          * Create a new attribute for the check item.
 517          */
 518         if (data->check_name == NULL) {
 519                 radlog(L_ERR, "rlm_sqlcounter: 'check-name' must be set.");
 520                 return -1;
 521         }
 522         dict_addattr(data->check_name, 0, PW_TYPE_INTEGER, -1, flags);
 523         dattr = dict_attrbyname(data->check_name);
 524         if (dattr == NULL) {
 525                 radlog(L_ERR, "rlm_sqlcounter: Failed to create check attribute %s",
 526                                 data->counter_name);
 527                 return -1;
 528         }
 529         DEBUG2("rlm_sqlcounter: Check attribute %s is number %d",
 530                         data->check_name, dattr->attr);
 531
 532         /*
 533          *  Discover the end of the current time period.
 534          */
 535         if (data->reset == NULL) {
 536                 radlog(L_ERR, "rlm_sqlcounter: 'reset' must be set.");
 537                 return -1;
 538         }
 539         now = time(NULL);
 540         data->reset_time = 0;
 541
 542         if (find_next_reset(data,now) == -1)
 543                 return -1;
 544
 545         /*
 546          *  Discover the beginning of the current time period.
 547          */
 548         data->last_reset = 0;
 549
 550         if (find_prev_reset(data,now) == -1)
 551                 return -1;
 552
 553
 554         /*
 555          *      Register the counter comparison operation.
 556          */
 557         paircompare_register(data->dict_attr, 0, sqlcounter_cmp, data);
 558
 559         *instance = data;
 560
 561         return 0;
 562 }
 563
 564 /*
 565  *      Find the named user in this modules database.  Create the set
 566  *      of attribute-value pairs to check and reply with for this user
 567  *      from the database. The authentication code only needs to check
 568  *      the password, the rest is done here.
 569  */
 570 static int sqlcounter_authorize(void *instance, REQUEST *request)
 571 {
 572         rlm_sqlcounter_t *data = (rlm_sqlcounter_t *) instance;
 573         int ret=RLM_MODULE_NOOP;
 574         int counter=0;
 575         int res=0;
 576         DICT_ATTR *dattr;
 577         VALUE_PAIR *key_vp, *check_vp;
 578         VALUE_PAIR *reply_item;
 579         char msg[128];
 580         char querystr[MAX_QUERY_LEN];
 581         char responsestr[MAX_QUERY_LEN];
 582
 583         /* quiet the compiler */
 584         instance = instance;
 585         request = request;
 586
 587         /*
 588          *      Before doing anything else, see if we have to reset
 589          *      the counters.
 590          */
 591         if (data->reset_time && (data->reset_time <= request->timestamp)) {
 592
 593                 /*
 594                  *      Re-set the next time and prev_time for this counters range
 595                  */
 596                 data->last_reset = data->reset_time;
 597                 find_next_reset(data,request->timestamp);
 598         }
 599
 600
 601         /*
 602          *      Look for the key.  User-Name is special.  It means
 603          *      The REAL username, after stripping.
 604          */
 605         DEBUG2("rlm_sqlcounter: Entering module authorize code");
 606         key_vp = (data->key_attr == PW_USER_NAME) ? request->username : pairfind(request->packet->vps, data->key_attr);
 607         if (key_vp == NULL) {
 608                 DEBUG2("rlm_sqlcounter: Could not find Key value pair");
 609                 return ret;
 610         }
 611
 612         /*
 613          *      Look for the check item
 614          */
 615         if ((dattr = dict_attrbyname(data->check_name)) == NULL) {
 616                 return ret;
 617         }
 618         /* DEBUG2("rlm_sqlcounter: Found Check item attribute %d", dattr->attr); */
 619         if ((check_vp= pairfind(request->config_items, dattr->attr)) == NULL) {
 620                 DEBUG2("rlm_sqlcounter: Could not find Check item value pair");
 621                 return ret;
 622         }
 623
 624         /* first, expand %k, %b and %e in query */
 625         sqlcounter_expand(querystr, MAX_QUERY_LEN, data->query, instance);
 626
 627         /* second, xlat any request attribs in query */
 628         radius_xlat(responsestr, MAX_QUERY_LEN, querystr, request, sql_escape_func);
 629
 630         /* third, wrap query with sql module & expand */
 631         snprintf(querystr, sizeof(querystr), "%%{%%S:%s}", responsestr);
 632         sqlcounter_expand(responsestr, MAX_QUERY_LEN, querystr, instance);
 633
 634         /* Finally, xlat resulting SQL query */
 635         radius_xlat(querystr, MAX_QUERY_LEN, responsestr, request, sql_escape_func);
 636
 637         counter = atoi(querystr);
 638
 639
 640         /*
 641          * Check if check item > counter
 642          */
 643         res=check_vp->lvalue - counter;
 644         if (res > 0) {
 645                 DEBUG2("rlm_sqlcounter: (Check item - counter) is greater than zero");
 646                 /*
 647                  *      We are assuming that simultaneous-use=1. But
 648                  *      even if that does not happen then our user
 649                  *      could login at max for 2*max-usage-time Is
 650                  *      that acceptable?
 651                  */
 652
 653                 /*
 654                  *      User is allowed, but set Session-Timeout.
 655                  *      Stolen from main/auth.c
 656                  */
 657
 658                 /*
 659                  *      If we are near a reset then add the next
 660                  *      limit, so that the user will not need to
 661                  *      login again
 662                  */
 663                 if (data->reset_time && (
 664                         res >= (data->reset_time - request->timestamp))) {
 665                         res = data->reset_time - request->timestamp;
 666                         res += check_vp->lvalue;
 667                 }
 668
 669                 if ((reply_item = pairfind(request->reply->vps, PW_SESSION_TIMEOUT)) != NULL) {
 670                         if (reply_item->lvalue > res)
 671                                 reply_item->lvalue = res;
 672                 } else {
 673                         if ((reply_item = paircreate(PW_SESSION_TIMEOUT, PW_TYPE_INTEGER)) == NULL) {
 674                                 radlog(L_ERR|L_CONS, "no memory");
 675                                 return RLM_MODULE_NOOP;
 676                         }
 677                         reply_item->lvalue = res;
 678                         pairadd(&request->reply->vps, reply_item);
 679                 }
 680
 681                 ret=RLM_MODULE_OK;
 682
 683                 DEBUG2("rlm_sqlcounter: Authorized user %s, check_item=%d, counter=%d",
 684                                 key_vp->strvalue,check_vp->lvalue,counter);
 685                 DEBUG2("rlm_sqlcounter: Sent Reply-Item for user %s, Type=Session-Timeout, value=%d",
 686                                 key_vp->strvalue,reply_item->lvalue);
 687         }
 688         else{
 689                 char module_fmsg[MAX_STRING_LEN];
 690                 VALUE_PAIR *module_fmsg_vp;
 691
 692                 DEBUG2("rlm_sqlcounter: (Check item - counter) is less than zero");
 693
 694                 /*
 695                  * User is denied access, send back a reply message
 696                  */
 697                 snprintf(msg, sizeof(msg), "Your maximum %s usage time has been reached", data->reset);
 698                 reply_item=pairmake("Reply-Message", msg, T_OP_EQ);
 699                 pairadd(&request->reply->vps, reply_item);
 700
 701                 snprintf(module_fmsg, sizeof(module_fmsg), "rlm_sqlcounter: Maximum %s usage time reached", data->reset);
 702                 module_fmsg_vp = pairmake("Module-Failure-Message", module_fmsg, T_OP_EQ);
 703                 pairadd(&request->packet->vps, module_fmsg_vp);
 704
 705                 ret=RLM_MODULE_REJECT;
 706
 707                 DEBUG2("rlm_sqlcounter: Rejected user %s, check_item=%d, counter=%d",
 708                                 key_vp->strvalue,check_vp->lvalue,counter);
 709         }
 710
 711         return ret;
 712 }
 713
 714 static int sqlcounter_detach(void *instance)
 715 {
 716         rlm_sqlcounter_t *data = (rlm_sqlcounter_t *) instance;
 717
 718         paircompare_unregister(data->dict_attr, sqlcounter_cmp);
 719         free(data->reset);
 720         free(data->query);
 721         free(data->check_name);
 722         free(data->sqlmod_inst);
 723         free(data->counter_name);
 724         free(data->allowed_chars);
 725         allowed_chars = NULL;
 726
 727         free(instance);
 728         return 0;
 729 }
 730
 731 /*
 732  *      The module name should be the only globally exported symbol.
 733  *      That is, everything else should be 'static'.
 734  *
 735  *      If the module needs to temporarily modify it's instantiation
 736  *      data, the type should be changed to RLM_TYPE_THREAD_UNSAFE.
 737  *      The server will then take care of ensuring that the module
 738  *      is single-threaded.
 739  */
 740 module_t rlm_sqlcounter = {
 741         "SQL Counter",
 742         RLM_TYPE_THREAD_SAFE,           /* type */
 743         NULL,                           /* initialization */
 744         sqlcounter_instantiate,         /* instantiation */
 745         {
 746                 NULL,                   /* authentication */
 747                 sqlcounter_authorize,   /* authorization */
 748                 NULL,                   /* preaccounting */
 749                 NULL,                   /* accounting */
 750                 NULL,                   /* checksimul */
 751                 NULL,                   /* pre-proxy */
 752                 NULL,                   /* post-proxy */
 753                 NULL                    /* post-auth */
 754         },
 755         sqlcounter_detach,              /* detach */
 756         NULL,                           /* destroy */
 757 };
 758