src/modules/rlm_sql/sql.c

   1 /*
   2  *  sql.c               rlm_sql - FreeRADIUS SQL Module
   3  *              Main code directly taken from ICRADIUS
   4  *
   5  * Version:     $Id$
   6  *
   7  *   This program is free software; you can redistribute it and/or modify
   8  *   it under the terms of the GNU General Public License as published by
   9  *   the Free Software Foundation; either version 2 of the License, or
  10  *   (at your option) any later version.
  11  *
  12  *   This program is distributed in the hope that it will be useful,
  13  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  *   GNU General Public License for more details.
  16  *
  17  *   You should have received a copy of the GNU General Public License
  18  *   along with this program; if not, write to the Free Software
  19  *   Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
  20  *
  21  * Copyright 2001,2006  The FreeRADIUS server project
  22  * Copyright 2000  Mike Machado <mike@innercite.com>
  23  * Copyright 2000  Alan DeKok <aland@ox.org>
  24  * Copyright 2001  Chad Miller <cmiller@surfsouth.com>
  25  */
  26
  27 RCSID("$Id$")
  28
  29 #include        <freeradius-devel/radiusd.h>
  30 #include        <freeradius-devel/rad_assert.h>
  31
  32 #include        <sys/file.h>
  33 #include        <sys/stat.h>
  34
  35 #include        <ctype.h>
  36
  37 #include        "rlm_sql.h"
  38
  39 #ifdef HAVE_PTHREAD_H
  40 #endif
  41
  42 static int sql_conn_destructor(void *conn)
  43 {
  44         rlm_sql_handle_t *handle = conn;
  45         rlm_sql_t *inst = handle->inst;
  46
  47         rad_assert(inst);
  48
  49         exec_trigger(NULL, inst->cs, "modules.sql.close", false);
  50
  51         return 0;
  52 }
  53
  54 static void *mod_conn_create(void *instance)
  55 {
  56         int rcode;
  57         rlm_sql_t *inst = instance;
  58         rlm_sql_handle_t *handle;
  59
  60         handle = talloc_zero(instance, rlm_sql_handle_t);
  61
  62         /*
  63          *      Handle requires a pointer to the SQL inst so the
  64          *      destructor has access to the module configuration.
  65          */
  66         handle->inst = inst;
  67
  68         /*
  69          *      When something frees this handle the destructor set by
  70          *      the driver will be called first, closing any open sockets.
  71          *      Then we call our destructor to trigger an modules.sql.close
  72          *      event, then all the memory is freed.
  73          */
  74         talloc_set_destructor((void *) handle, sql_conn_destructor);
  75
  76         rcode = (inst->module->sql_socket_init)(handle, inst->config);
  77         if (rcode == 0) {
  78                 exec_trigger(NULL, inst->cs, "modules.sql.open", false);
  79
  80                 return handle;
  81         }
  82
  83         exec_trigger(NULL, inst->cs, "modules.sql.fail", true);
  84
  85         /*
  86          *      Destroy any half opened connections.
  87          */
  88         talloc_free(handle);
  89         return NULL;
  90 }
  91
  92 /*
  93  *      @todo Calls to this should eventually go away.
  94  */
  95 static int mod_conn_delete(UNUSED void *instance, void *handle)
  96 {
  97         return talloc_free(handle);
  98 }
  99
 100 /*************************************************************************
 101  *
 102  *      Function: sql_socket_pool_init
 103  *
 104  *      Purpose: Connect to the sql server, if possible
 105  *
 106  *************************************************************************/
 107 int sql_socket_pool_init(rlm_sql_t * inst)
 108 {
 109         inst->pool = fr_connection_pool_init(inst->cs, inst,
 110                                              mod_conn_create, NULL, mod_conn_delete,
 111                                              NULL);
 112         if (!inst->pool) return -1;
 113
 114         return 1;
 115 }
 116
 117 /*************************************************************************
 118  *
 119  *     Function: sql_poolfree
 120  *
 121  *     Purpose: Clean up and free sql pool
 122  *
 123  *************************************************************************/
 124 void sql_poolfree(rlm_sql_t * inst)
 125 {
 126         fr_connection_pool_delete(inst->pool);
 127 }
 128
 129
 130 /*************************************************************************
 131  *
 132  *      Function: sql_get_socket
 133  *
 134  *      Purpose: Return a SQL handle from the connection pool
 135  *
 136  *************************************************************************/
 137 rlm_sql_handle_t * sql_get_socket(rlm_sql_t * inst)
 138 {
 139         return fr_connection_get(inst->pool);
 140 }
 141
 142 /*************************************************************************
 143  *
 144  *      Function: sql_release_socket
 145  *
 146  *      Purpose: Frees a SQL handle back to the connection pool
 147  *
 148  *************************************************************************/
 149 int sql_release_socket(rlm_sql_t * inst, rlm_sql_handle_t * handle)
 150 {
 151         fr_connection_release(inst->pool, handle);
 152         return 0;
 153 }
 154
 155
 156 /*************************************************************************
 157  *
 158  *      Function: sql_userparse
 159  *
 160  *      Purpose: Read entries from the database and fill VALUE_PAIR structures
 161  *
 162  *************************************************************************/
 163 int sql_userparse(TALLOC_CTX *ctx, VALUE_PAIR **head, rlm_sql_row_t row)
 164 {
 165         VALUE_PAIR *vp;
 166         char const *ptr, *value;
 167         char buf[MAX_STRING_LEN];
 168         char do_xlat = 0;
 169         FR_TOKEN token, operator = T_EOL;
 170
 171         /*
 172          *      Verify the 'Attribute' field
 173          */
 174         if (!row[2] || row[2][0] == '\0') {
 175                 ERROR("rlm_sql: The 'Attribute' field is empty or NULL, skipping the entire row.");
 176                 return -1;
 177         }
 178
 179         /*
 180          *      Verify the 'op' field
 181          */
 182         if (row[4] != NULL && row[4][0] != '\0') {
 183                 ptr = row[4];
 184                 operator = gettoken(&ptr, buf, sizeof(buf));
 185                 if ((operator < T_OP_ADD) ||
 186                     (operator > T_OP_CMP_EQ)) {
 187                         ERROR("rlm_sql: Invalid operator \"%s\" for attribute %s", row[4], row[2]);
 188                         return -1;
 189                 }
 190
 191         } else {
 192                 /*
 193                  *  Complain about empty or invalid 'op' field
 194                  */
 195                 operator = T_OP_CMP_EQ;
 196                 ERROR("rlm_sql: The 'op' field for attribute '%s = %s' is NULL, or non-existent.", row[2], row[3]);
 197                 ERROR("rlm_sql: You MUST FIX THIS if you want the configuration to behave as you expect.");
 198         }
 199
 200         /*
 201          *      The 'Value' field may be empty or NULL
 202          */
 203         value = row[3];
 204         /*
 205          *      If we have a new-style quoted string, where the
 206          *      *entire* string is quoted, do xlat's.
 207          */
 208         if (row[3] != NULL &&
 209            ((row[3][0] == '\'') || (row[3][0] == '`') || (row[3][0] == '"')) &&
 210            (row[3][0] == row[3][strlen(row[3])-1])) {
 211
 212                 token = gettoken(&value, buf, sizeof(buf));
 213                 switch (token) {
 214                 /*
 215                  *      Take the unquoted string.
 216                  */
 217                 case T_SINGLE_QUOTED_STRING:
 218                 case T_DOUBLE_QUOTED_STRING:
 219                         value = buf;
 220                         break;
 221
 222                 /*
 223                  *      Mark the pair to be allocated later.
 224                  */
 225                 case T_BACK_QUOTED_STRING:
 226                         value = NULL;
 227                         do_xlat = 1;
 228                         break;
 229
 230                 /*
 231                  *      Keep the original string.
 232                  */
 233                 default:
 234                         value = row[3];
 235                         break;
 236                 }
 237         }
 238
 239         /*
 240          *      Create the pair
 241          */
 242         vp = pairmake(ctx, NULL, row[2], NULL, operator);
 243         if (!vp) {
 244                 ERROR("rlm_sql: Failed to create the pair: %s",
 245                        fr_strerror());
 246                 return -1;
 247         }
 248
 249         if (do_xlat) {
 250                 if (pairmark_xlat(vp, value) < 0) {
 251                         ERROR("rlm_sql: Error marking pair for xlat");
 252
 253                         pairbasicfree(vp);
 254                         return -1;
 255                 }
 256         } else {
 257                 if (pairparsevalue(vp, value) < 0) {
 258                         ERROR("rlm_sql: Error parsing value");
 259
 260                         pairbasicfree(vp);
 261                         return -1;
 262                 }
 263         }
 264
 265         /*
 266          *      Add the pair into the packet
 267          */
 268         pairadd(head, vp);
 269         return 0;
 270 }
 271
 272
 273 /*************************************************************************
 274  *
 275  *      Function: rlm_sql_fetch_row
 276  *
 277  *      Purpose: call the module's sql_fetch_row and implement re-connect
 278  *
 279  *************************************************************************/
 280 int rlm_sql_fetch_row(rlm_sql_handle_t **handle, rlm_sql_t *inst)
 281 {
 282         int ret;
 283
 284         if (!*handle || !(*handle)->conn) {
 285                 return -1;
 286         }
 287
 288         /*
 289          * We can't implement reconnect logic here, because the caller may require
 290          * the original connection to free up queries or result sets associated with
 291          * that connection.
 292          */
 293         ret = (inst->module->sql_fetch_row)(*handle, inst->config);
 294
 295         if (ret < 0) {
 296                 char const *error = (inst->module->sql_error)(*handle, inst->config);
 297                 EDEBUG("rlm_sql (%s): Error fetching row: %s",
 298                        inst->config->xlat_name, error ? error : "<UNKNOWN>");
 299         }
 300
 301         return ret;
 302 }
 303
 304 /*************************************************************************
 305  *
 306  *      Function: rlm_sql_query
 307  *
 308  *      Purpose: call the module's sql_query and implement re-connect
 309  *
 310  *************************************************************************/
 311 int rlm_sql_query(rlm_sql_handle_t **handle, rlm_sql_t *inst, char const *query)
 312 {
 313         int ret;
 314
 315         /*
 316          *      If there's no query, return an error.
 317          */
 318         if (!query || !*query) {
 319                 return -1;
 320         }
 321
 322         if (!*handle || !(*handle)->conn) {
 323                 ret = -1;
 324                 goto sql_down;
 325         }
 326
 327         while (1) {
 328                 DEBUG("rlm_sql (%s): Executing query: '%s'",
 329                       inst->config->xlat_name, query);
 330
 331                 ret = (inst->module->sql_query)(*handle, inst->config, query);
 332                 /*
 333                  * Run through all available sockets until we exhaust all existing
 334                  * sockets in the pool and fail to establish a *new* connection.
 335                  */
 336                 if (ret == RLM_SQL_RECONNECT) {
 337                         sql_down:
 338                         *handle = fr_connection_reconnect(inst->pool, *handle);
 339                         if (!*handle) return RLM_SQL_RECONNECT;
 340
 341                         continue;
 342                 }
 343
 344                 if (ret < 0) {
 345                         char const *error = (inst->module->sql_error)(*handle, inst->config);
 346                         ERROR("rlm_sql (%s): Database query error: %s",
 347                               inst->config->xlat_name, error ? error : "<UNKNOWN>");
 348                 }
 349
 350                 return ret;
 351         }
 352 }
 353
 354 /*************************************************************************
 355  *
 356  *      Function: rlm_sql_select_query
 357  *
 358  *      Purpose: call the module's sql_select_query and implement re-connect
 359  *
 360  *************************************************************************/
 361 int rlm_sql_select_query(rlm_sql_handle_t **handle, rlm_sql_t *inst, char const *query)
 362 {
 363         int ret;
 364
 365         /*
 366          *      If there's no query, return an error.
 367          */
 368         if (!query || !*query) {
 369                 return -1;
 370         }
 371
 372         if (!*handle || !(*handle)->conn) {
 373                 ret = -1;
 374                 goto sql_down;
 375         }
 376
 377         while (1) {
 378                 DEBUG("rlm_sql (%s): Executing query: '%s'",
 379                       inst->config->xlat_name, query);
 380
 381                 ret = (inst->module->sql_select_query)(*handle, inst->config, query);
 382                 /*
 383                  * Run through all available sockets until we exhaust all existing
 384                  * sockets in the pool and fail to establish a *new* connection.
 385                  */
 386                 if (ret == RLM_SQL_RECONNECT) {
 387                         sql_down:
 388                         *handle = fr_connection_reconnect(inst->pool, *handle);
 389                         if (!*handle) return RLM_SQL_RECONNECT;
 390
 391                         continue;
 392                 }
 393
 394                 if (ret < 0) {
 395                         char const *error = (inst->module->sql_error)(*handle, inst->config);
 396                         ERROR("rlm_sql (%s): Database query error '%s'",
 397                               inst->config->xlat_name, error ? error : "<UNKNOWN>");
 398                 }
 399
 400                 return ret;
 401         }
 402 }
 403
 404
 405 /*************************************************************************
 406  *
 407  *      Function: sql_getvpdata
 408  *
 409  *      Purpose: Get any group check or reply pairs
 410  *
 411  *************************************************************************/
 412 int sql_getvpdata(rlm_sql_t * inst, rlm_sql_handle_t **handle,
 413                   TALLOC_CTX *ctx, VALUE_PAIR **pair, char const *query)
 414 {
 415         rlm_sql_row_t row;
 416         int     rows = 0;
 417
 418         if (rlm_sql_select_query(handle, inst, query)) {
 419                 return -1;
 420         }
 421
 422         while (rlm_sql_fetch_row(handle, inst) == 0) {
 423                 row = (*handle)->row;
 424                 if (!row)
 425                         break;
 426                 if (sql_userparse(ctx, pair, row) != 0) {
 427                         ERROR("rlm_sql (%s): Error getting data from database", inst->config->xlat_name);
 428
 429                         (inst->module->sql_finish_select_query)(*handle, inst->config);
 430
 431                         return -1;
 432                 }
 433                 rows++;
 434         }
 435         (inst->module->sql_finish_select_query)(*handle, inst->config);
 436
 437         return rows;
 438 }
 439
 440 /*
 441  *      Log the query to a file.
 442  */
 443 void rlm_sql_query_log(rlm_sql_t *inst, REQUEST *request,
 444                        sql_acct_section_t *section, char const *query)
 445 {
 446         int fd;
 447         char const *filename = NULL;
 448         char *expanded = NULL;
 449
 450         if (section) {
 451                 filename = section->logfile;
 452         } else {
 453                 filename = inst->config->logfile;
 454         }
 455
 456         if (!filename) {
 457                 return;
 458         }
 459
 460         if (radius_axlat(&expanded, request, filename, NULL, NULL) < 0) {
 461                 return;
 462         }
 463
 464         fd = open(filename, O_WRONLY | O_APPEND | O_CREAT, 0666);
 465         if (fd < 0) {
 466                 ERROR("rlm_sql (%s): Couldn't open logfile '%s': %s", inst->config->xlat_name,
 467                        expanded, strerror(errno));
 468
 469                 talloc_free(expanded);
 470                 return;
 471         }
 472
 473         if ((rad_lockfd(fd, MAX_QUERY_LEN) < 0) || (write(fd, query, strlen(query)) < 0) || (write(fd, ";\n", 2) < 0)) {
 474                 ERROR("rlm_sql (%s): Failed writing to logfile '%s': %s", inst->config->xlat_name, expanded,
 475                        strerror(errno));
 476         }
 477
 478         talloc_free(expanded);
 479         close(fd);              /* and release the lock */
 480 }