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