res/res_smdi.c

   1 /*
   2  * Asterisk -- A telephony toolkit for Linux.
   3  *
   4  * Copyright (C) 2005-2006, Digium, Inc.
   5  *
   6  * Matthew A. Nicholson <mnicholson@digium.com>
   7  *
   8  * See http://www.asterisk.org for more information about
   9  * the Asterisk project. Please do not directly contact
  10  * any of the maintainers of this project for assistance;
  11  * the project provides a web site, mailing lists and IRC
  12  * channels for your use.
  13  *
  14  * This program is free software, distributed under the terms of
  15  * the GNU General Public License Version 2. See the LICENSE file
  16  * at the top of the source tree.
  17  */
  18
  19 /*!
  20  * \file
  21  * \brief SMDI support for Asterisk.
  22  * \author Matthew A. Nicholson <mnicholson@digium.com>
  23  */
  24
  25 #include "asterisk.h"
  26
  27 ASTERISK_FILE_VERSION(__FILE__, "$Revision$")
  28
  29 #include <stdio.h>
  30 #include <stdlib.h>
  31 #include <errno.h>
  32 #include <termios.h>
  33 #include <sys/time.h>
  34 #include <time.h>
  35 #include <ctype.h>
  36
  37 #include "asterisk/module.h"
  38 #include "asterisk/lock.h"
  39 #include "asterisk/utils.h"
  40 #include "asterisk/smdi.h"
  41 #include "asterisk/config.h"
  42 #include "asterisk/astobj.h"
  43 #include "asterisk/io.h"
  44 #include "asterisk/logger.h"
  45 #include "asterisk/utils.h"
  46 #include "asterisk/options.h"
  47
  48 /* Message expiry time in milliseconds */
  49 #define SMDI_MSG_EXPIRY_TIME    30000 /* 30 seconds */
  50
  51 static const char config_file[] = "smdi.conf";
  52
  53 static void ast_smdi_md_message_push(struct ast_smdi_interface *iface, struct ast_smdi_md_message *msg);
  54 static void ast_smdi_mwi_message_push(struct ast_smdi_interface *iface, struct ast_smdi_mwi_message *msg);
  55
  56 static void *smdi_read(void *iface_p);
  57 static int smdi_load(int reload);
  58
  59 struct module_symbols *me;      /* initialized in load_module() */
  60
  61 /*! \brief SMDI interface container. */
  62 struct ast_smdi_interface_container {
  63         ASTOBJ_CONTAINER_COMPONENTS(struct ast_smdi_interface);
  64 } smdi_ifaces;
  65
  66 /*!
  67  * \internal
  68  * \brief Push an SMDI message to the back of an interface's message queue.
  69  * \param iface a pointer to the interface to use.
  70  * \param md_msg a pointer to the message to use.
  71  */
  72 static void ast_smdi_md_message_push(struct ast_smdi_interface *iface, struct ast_smdi_md_message *md_msg)
  73 {
  74         ASTOBJ_CONTAINER_LINK_END(&iface->md_q, md_msg);
  75 }
  76
  77 /*!
  78  * \internal
  79  * \brief Push an SMDI message to the back of an interface's message queue.
  80  * \param iface a pointer to the interface to use.
  81  * \param mwi_msg a pointer to the message to use.
  82  */
  83 static void ast_smdi_mwi_message_push(struct ast_smdi_interface *iface, struct ast_smdi_mwi_message *mwi_msg)
  84 {
  85         ASTOBJ_CONTAINER_LINK_END(&iface->mwi_q, mwi_msg);
  86 }
  87
  88 /*!
  89  * \brief Set the MWI indicator for a mailbox.
  90  * \param iface the interface to use.
  91  * \param mailbox the mailbox to use.
  92  */
  93 int ast_smdi_mwi_set(struct ast_smdi_interface *iface, const char *mailbox)
  94 {
  95         FILE *file;
  96         int i;
  97
  98         file = fopen(iface->name, "w");
  99         if(!file) {
 100                 ast_log(LOG_ERROR, "Error opening SMDI interface %s (%s) for writing\n", iface->name, strerror(errno));
 101                 return 1;
 102         }
 103
 104         ASTOBJ_WRLOCK(iface);
 105
 106         fprintf(file, "OP:MWI ");
 107
 108         for(i = 0; i < iface->msdstrip; i++)
 109            fprintf(file, "0");
 110
 111         fprintf(file, "%s!\x04", mailbox);
 112         fclose(file);
 113
 114         ASTOBJ_UNLOCK(iface);
 115         ast_log(LOG_DEBUG, "Sent MWI set message for %s on %s\n", mailbox, iface->name);
 116         return 0;
 117 }
 118
 119 /*!
 120  * \brief Unset the MWI indicator for a mailbox.
 121  * \param iface the interface to use.
 122  * \param mailbox the mailbox to use.
 123  */
 124 int ast_smdi_mwi_unset(struct ast_smdi_interface *iface, const char *mailbox)
 125 {
 126         FILE *file;
 127         int i;
 128
 129         file = fopen(iface->name, "w");
 130         if(!file) {
 131                 ast_log(LOG_ERROR, "Error opening SMDI interface %s (%s) for writing\n", iface->name, strerror(errno));
 132                 return 1;
 133         }
 134
 135         ASTOBJ_WRLOCK(iface);
 136
 137         fprintf(file, "RMV:MWI ");
 138
 139         for(i = 0; i < iface->msdstrip; i++)
 140            fprintf(file, "0");
 141
 142         fprintf(file, "%s!\x04", mailbox);
 143         fclose(file);
 144
 145         ASTOBJ_UNLOCK(iface);
 146         ast_log(LOG_DEBUG, "Sent MWI unset message for %s on %s\n", mailbox, iface->name);
 147         return 0;
 148 }
 149
 150 /*!
 151  * \brief Put an SMDI message back in the front of the queue.
 152  * \param iface a pointer to the interface to use.
 153  * \param md_msg a pointer to the message to use.
 154  *
 155  * This function puts a message back in the front of the specified queue.  It
 156  * should be used if a message was popped but is not going to be processed for
 157  * some reason, and the message needs to be returned to the queue.
 158  */
 159 void ast_smdi_md_message_putback(struct ast_smdi_interface *iface, struct ast_smdi_md_message *md_msg)
 160 {
 161         ASTOBJ_CONTAINER_LINK_START(&iface->md_q, md_msg);
 162 }
 163
 164 /*!
 165  * \brief Put an SMDI message back in the front of the queue.
 166  * \param iface a pointer to the interface to use.
 167  * \param mwi_msg a pointer to the message to use.
 168  *
 169  * This function puts a message back in the front of the specified queue.  It
 170  * should be used if a message was popped but is not going to be processed for
 171  * some reason, and the message needs to be returned to the queue.
 172  */
 173 void ast_smdi_mwi_message_putback(struct ast_smdi_interface *iface, struct ast_smdi_mwi_message *mwi_msg)
 174 {
 175         ASTOBJ_CONTAINER_LINK_START(&iface->mwi_q, mwi_msg);
 176 }
 177
 178 /*!
 179  * \brief Get the next SMDI message from the queue.
 180  * \param iface a pointer to the interface to use.
 181  *
 182  * This function pulls the first unexpired message from the SMDI message queue
 183  * on the specified interface.  It will purge all expired SMDI messages before
 184  * returning.
 185  *
 186  * \return the next SMDI message, or NULL if there were no pending messages.
 187  */
 188 struct ast_smdi_md_message *ast_smdi_md_message_pop(struct ast_smdi_interface *iface)
 189 {
 190         struct ast_smdi_md_message *md_msg = ASTOBJ_CONTAINER_UNLINK_START(&iface->md_q);
 191         struct timeval now;
 192         long elapsed = 0;
 193
 194         /* purge old messages */
 195         now = ast_tvnow();
 196         while (md_msg) {
 197                 elapsed = ast_tvdiff_ms(now, md_msg->timestamp);
 198
 199                 if (elapsed > iface->msg_expiry) {
 200                         /* found an expired message */
 201                         ASTOBJ_UNREF(md_msg, ast_smdi_md_message_destroy);
 202                         ast_log(LOG_NOTICE, "Purged expired message from %s SMDI MD message queue.  Message was %ld milliseconds too old.\n",
 203                                 iface->name, elapsed - iface->msg_expiry);
 204                         md_msg = ASTOBJ_CONTAINER_UNLINK_START(&iface->md_q);
 205                 }
 206                 else {
 207                         /* good message, return it */
 208                         break;
 209                 }
 210         }
 211
 212         return md_msg;
 213 }
 214
 215 /*!
 216  * \brief Get the next SMDI message from the queue.
 217  * \param iface a pointer to the interface to use.
 218  * \param timeout the time to wait before returning in milliseconds.
 219  *
 220  * This function pulls a message from the SMDI message queue on the specified
 221  * interface.  If no message is available this function will wait the specified
 222  * amount of time before returning.
 223  *
 224  * \return the next SMDI message, or NULL if there were no pending messages and
 225  * the timeout has expired.
 226  */
 227 extern struct ast_smdi_md_message *ast_smdi_md_message_wait(struct ast_smdi_interface *iface, int timeout)
 228 {
 229         struct timeval start;
 230         long diff = 0;
 231         struct ast_smdi_md_message *msg;
 232
 233         start = ast_tvnow();
 234         while (diff < timeout) {
 235
 236                 if ((msg = ast_smdi_md_message_pop(iface)))
 237                         return msg;
 238
 239                 /* check timeout */
 240                 diff = ast_tvdiff_ms(ast_tvnow(), start);
 241         }
 242
 243         return (ast_smdi_md_message_pop(iface));
 244 }
 245
 246 /*!
 247  * \brief Get the next SMDI message from the queue.
 248  * \param iface a pointer to the interface to use.
 249  *
 250  * This function pulls the first unexpired message from the SMDI message queue
 251  * on the specified interface.  It will purge all expired SMDI messages before
 252  * returning.
 253  *
 254  * \return the next SMDI message, or NULL if there were no pending messages.
 255  */
 256 extern struct ast_smdi_mwi_message *ast_smdi_mwi_message_pop(struct ast_smdi_interface *iface)
 257 {
 258         struct ast_smdi_mwi_message *mwi_msg = ASTOBJ_CONTAINER_UNLINK_START(&iface->mwi_q);
 259         struct timeval now;
 260         long elapsed = 0;
 261
 262         /* purge old messages */
 263         now = ast_tvnow();
 264         while (mwi_msg) {
 265                 elapsed = ast_tvdiff_ms(now, mwi_msg->timestamp);
 266
 267                 if (elapsed > iface->msg_expiry) {
 268                         /* found an expired message */
 269                         ASTOBJ_UNREF(mwi_msg, ast_smdi_mwi_message_destroy);
 270                         ast_log(LOG_NOTICE, "Purged expired message from %s SMDI MWI message queue.  Message was %ld milliseconds too old.\n",
 271                                 iface->name, elapsed - iface->msg_expiry);
 272                         mwi_msg = ASTOBJ_CONTAINER_UNLINK_START(&iface->mwi_q);
 273                 }
 274                 else {
 275                         /* good message, return it */
 276                         break;
 277                 }
 278         }
 279
 280         return mwi_msg;
 281 }
 282
 283 /*!
 284  * \brief Get the next SMDI message from the queue.
 285  * \param iface a pointer to the interface to use.
 286  * \param timeout the time to wait before returning in milliseconds.
 287  *
 288  * This function pulls a message from the SMDI message queue on the specified
 289  * interface.  If no message is available this function will wait the specified
 290  * amount of time before returning.
 291  *
 292  * \return the next SMDI message, or NULL if there were no pending messages and
 293  * the timeout has expired.
 294  */
 295 extern struct ast_smdi_mwi_message *ast_smdi_mwi_message_wait(struct ast_smdi_interface *iface, int timeout)
 296 {
 297         struct timeval start;
 298         long diff = 0;
 299         struct ast_smdi_mwi_message *msg;
 300
 301         start = ast_tvnow();
 302         while (diff < timeout) {
 303
 304                 if ((msg = ast_smdi_mwi_message_pop(iface)))
 305                         return msg;
 306
 307                 /* check timeout */
 308                 diff = ast_tvdiff_ms(ast_tvnow(), start);
 309         }
 310
 311         return (ast_smdi_mwi_message_pop(iface));
 312 }
 313
 314 /*!
 315  * \brief Find an SMDI interface with the specified name.
 316  * \param iface_name the name/port of the interface to search for.
 317  *
 318  * \return a pointer to the interface located or NULL if none was found.  This
 319  * actually returns an ASTOBJ reference and should be released using
 320  * #ASTOBJ_UNREF(iface, ast_smdi_interface_destroy).
 321  */
 322 extern struct ast_smdi_interface *ast_smdi_interface_find(const char *iface_name)
 323 {
 324         return (ASTOBJ_CONTAINER_FIND(&smdi_ifaces, iface_name));
 325 }
 326
 327 /*! \brief Read an SMDI message.
 328  *
 329  * \param iface_p the SMDI interface to read from.
 330  *
 331  * This function loops and reads from and SMDI interface.  It must be stopped
 332  * using pthread_cancel().
 333  */
 334 static void *smdi_read(void *iface_p)
 335 {
 336         struct ast_smdi_interface *iface = iface_p;
 337         struct ast_smdi_md_message *md_msg;
 338         struct ast_smdi_mwi_message *mwi_msg;
 339         char c = '\0';
 340         char *cp = NULL;
 341         int i;
 342         int start = 0;
 343
 344         /* read an smdi message */
 345         while ((c = fgetc(iface->file))) {
 346
 347                 /* check if this is the start of a message */
 348                 if (!start) {
 349                         if (c == 'M')
 350                                 start = 1;
 351                 }
 352                 else { /* Determine if this is a MD or MWI message */
 353                         if(c == 'D') { /* MD message */
 354                                 start = 0;
 355
 356                                 if (!(md_msg = ast_calloc(1, sizeof(*md_msg)))) {
 357                                         ASTOBJ_UNREF(iface,ast_smdi_interface_destroy);
 358                                         return NULL;
 359                                 }
 360
 361                                 ASTOBJ_INIT(md_msg);
 362
 363                                 /* read the message desk number */
 364                                 for(i = 0; i < SMDI_MESG_DESK_NUM_LEN; i++)
 365                                         md_msg->mesg_desk_num[i] = fgetc(iface->file);
 366
 367                                 md_msg->mesg_desk_num[SMDI_MESG_DESK_NUM_LEN] = '\0';
 368
 369                                 /* read the message desk terminal number */
 370                                 for(i = 0; i < SMDI_MESG_DESK_TERM_LEN; i++)
 371                                         md_msg->mesg_desk_term[i] = fgetc(iface->file);
 372
 373                                 md_msg->mesg_desk_term[SMDI_MESG_DESK_TERM_LEN] = '\0';
 374
 375                                 /* read the message type */
 376                                 md_msg->type = fgetc(iface->file);
 377
 378                                 /* read the forwarding station number (may be blank) */
 379                                 cp = &md_msg->fwd_st[0];
 380                                 for (i = 0; i < SMDI_MAX_STATION_NUM_LEN + 1; i++) {
 381                                         if((c = fgetc(iface->file)) == ' ') {
 382                                                 *cp = '\0';
 383                                                 break;
 384                                         }
 385
 386                                         /* store c in md_msg->fwd_st */
 387                                         if( i >= iface->msdstrip)
 388                                                 *cp++ = c;
 389                                 }
 390
 391                                 /* make sure the value is null terminated, even if this truncates it */
 392                                 md_msg->fwd_st[SMDI_MAX_STATION_NUM_LEN] = '\0';
 393                                 cp = NULL;
 394
 395                                 /* read the calling station number (may be blank) */
 396                                 cp = &md_msg->calling_st[0];
 397                                 for (i = 0; i < SMDI_MAX_STATION_NUM_LEN + 1; i++) {
 398                                         if (!isdigit((c = fgetc(iface->file)))) {
 399                                                 *cp = '\0';
 400                                                 break;
 401                                         }
 402
 403                                         /* store c in md_msg->calling_st */
 404                                         if (i >= iface->msdstrip)
 405                                                 *cp++ = c;
 406                                 }
 407
 408                                 /* make sure the value is null terminated, even if this truncates it */
 409                                 md_msg->calling_st[SMDI_MAX_STATION_NUM_LEN] = '\0';
 410                                 cp = NULL;
 411
 412                                 /* add the message to the message queue */
 413                                 md_msg->timestamp = ast_tvnow();
 414                                 ast_smdi_md_message_push(iface, md_msg);
 415                                 ast_log(LOG_DEBUG, "Recieved SMDI MD message on %s\n", iface->name);
 416
 417                                 ASTOBJ_UNREF(md_msg, ast_smdi_md_message_destroy);
 418
 419                         } else if(c == 'W') { /* MWI message */
 420                                 start = 0;
 421
 422                                 if (!(mwi_msg = ast_calloc(1, sizeof(*mwi_msg)))) {
 423                                         ASTOBJ_UNREF(iface,ast_smdi_interface_destroy);
 424                                         return NULL;
 425                                 }
 426
 427                                 ASTOBJ_INIT(mwi_msg);
 428
 429                                 /* discard the 'I' (from 'MWI') */
 430                                 fgetc(iface->file);
 431
 432                                 /* read the forwarding station number (may be blank) */
 433                                 cp = &mwi_msg->fwd_st[0];
 434                                 for (i = 0; i < SMDI_MAX_STATION_NUM_LEN + 1; i++) {
 435                                         if ((c = fgetc(iface->file)) == ' ') {
 436                                                 *cp = '\0';
 437                                                 break;
 438                                         }
 439
 440                                         /* store c in md_msg->fwd_st */
 441                                         if (i >= iface->msdstrip)
 442                                                 *cp++ = c;
 443                                 }
 444
 445                                 /* make sure the station number is null terminated, even if this will truncate it */
 446                                 mwi_msg->fwd_st[SMDI_MAX_STATION_NUM_LEN] = '\0';
 447                                 cp = NULL;
 448
 449                                 /* read the mwi failure cause */
 450                                 for (i = 0; i < SMDI_MWI_FAIL_CAUSE_LEN; i++)
 451                                         mwi_msg->cause[i] = fgetc(iface->file);
 452
 453                                 mwi_msg->cause[SMDI_MWI_FAIL_CAUSE_LEN] = '\0';
 454
 455                                 /* add the message to the message queue */
 456                                 mwi_msg->timestamp = ast_tvnow();
 457                                 ast_smdi_mwi_message_push(iface, mwi_msg);
 458                                 ast_log(LOG_DEBUG, "Recieved SMDI MWI message on %s\n", iface->name);
 459
 460                                 ASTOBJ_UNREF(mwi_msg, ast_smdi_mwi_message_destroy);
 461                         } else {
 462                                 ast_log(LOG_ERROR, "Unknown SMDI message type recieved on %s (M%c).\n", iface->name, c);
 463                                 start = 0;
 464                         }
 465                 }
 466         }
 467
 468         ast_log(LOG_ERROR, "Error reading from SMDI interface %s, stopping listener thread\n", iface->name);
 469         ASTOBJ_UNREF(iface,ast_smdi_interface_destroy);
 470         return NULL;
 471 }
 472
 473 /*! \brief ast_smdi_md_message destructor. */
 474 void ast_smdi_md_message_destroy(struct ast_smdi_md_message *msg)
 475 {
 476         free(msg);
 477 }
 478
 479 /*! \brief ast_smdi_mwi_message destructor. */
 480 void ast_smdi_mwi_message_destroy(struct ast_smdi_mwi_message *msg)
 481 {
 482         free(msg);
 483 }
 484
 485 /*! \brief ast_smdi_interface destructor. */
 486 void ast_smdi_interface_destroy(struct ast_smdi_interface *iface)
 487 {
 488         if (iface->thread != AST_PTHREADT_NULL && iface->thread != AST_PTHREADT_STOP) {
 489                 pthread_cancel(iface->thread);
 490                 pthread_join(iface->thread, NULL);
 491         }
 492
 493         iface->thread = AST_PTHREADT_STOP;
 494
 495         if(iface->file)
 496                 fclose(iface->file);
 497
 498         ASTOBJ_CONTAINER_DESTROYALL(&iface->md_q, ast_smdi_md_message_destroy);
 499         ASTOBJ_CONTAINER_DESTROYALL(&iface->mwi_q, ast_smdi_mwi_message_destroy);
 500         ASTOBJ_CONTAINER_DESTROY(&iface->md_q);
 501         ASTOBJ_CONTAINER_DESTROY(&iface->mwi_q);
 502         free(iface);
 503
 504         ast_module_unref(ast_module_info->self);
 505 }
 506
 507 /*!
 508  * \internal
 509  * \brief Load and reload SMDI configuration.
 510  * \param reload this should be 1 if we are reloading and 0 if not.
 511  *
 512  * This function loads/reloads the SMDI configuration and starts and stops
 513  * interfaces accordingly.
 514  *
 515  * \return zero on success, -1 on failure, and 1 if no smdi interfaces were started.
 516  */
 517 static int smdi_load(int reload)
 518 {
 519         struct ast_config *conf;
 520         struct ast_variable *v;
 521         struct ast_smdi_interface *iface = NULL;
 522         int res = 0;
 523
 524         /* Config options */
 525         speed_t baud_rate = B9600;     /* 9600 baud rate */
 526         tcflag_t paritybit = PARENB;   /* even parity checking */
 527         tcflag_t charsize = CS7;       /* seven bit characters */
 528         int stopbits = 0;              /* One stop bit */
 529
 530         int msdstrip = 0;              /* strip zero digits */
 531         long msg_expiry = SMDI_MSG_EXPIRY_TIME;
 532
 533         conf = ast_config_load(config_file);
 534
 535         if (!conf) {
 536                 if (reload)
 537                         ast_log(LOG_NOTICE, "Unable to reload config %s: SMDI untouched\n", config_file);
 538                 else
 539                         ast_log(LOG_NOTICE, "Unable to load config %s: SMDI disabled\n", config_file);
 540                 return 1;
 541         }
 542
 543         /* Mark all interfaces that we are listening on.  We will unmark them
 544          * as we find them in the config file, this way we know any interfaces
 545          * still marked after we have finished parsing the config file should
 546          * be stopped.
 547          */
 548         if (reload)
 549                 ASTOBJ_CONTAINER_MARKALL(&smdi_ifaces);
 550
 551         for (v = ast_variable_browse(conf, "interfaces"); v; v = v->next) {
 552                 if (!strcasecmp(v->name, "baudrate")) {
 553                         if (!strcasecmp(v->value, "9600"))
 554                                 baud_rate = B9600;
 555                         else if(!strcasecmp(v->value, "4800"))
 556                                 baud_rate = B4800;
 557                         else if(!strcasecmp(v->value, "2400"))
 558                                 baud_rate = B2400;
 559                         else if(!strcasecmp(v->value, "1200"))
 560                                 baud_rate = B1200;
 561                         else {
 562                                 ast_log(LOG_NOTICE, "Invalid baud rate '%s' specified in %s (line %d), using default\n", v->value, config_file, v->lineno);
 563                                 baud_rate = B9600;
 564                         }
 565                 } else if (!strcasecmp(v->name, "msdstrip")) {
 566                         if (!sscanf(v->value, "%d", &msdstrip)) {
 567                                 ast_log(LOG_NOTICE, "Invalid msdstrip value in %s (line %d), using default\n", config_file, v->lineno);
 568                                 msdstrip = 0;
 569                         } else if (0 > msdstrip || msdstrip > 9) {
 570                                 ast_log(LOG_NOTICE, "Invalid msdstrip value in %s (line %d), using default\n", config_file, v->lineno);
 571                                 msdstrip = 0;
 572                         }
 573                 } else if (!strcasecmp(v->name, "msgexpirytime")) {
 574                         if (!sscanf(v->value, "%ld", &msg_expiry)) {
 575                                 ast_log(LOG_NOTICE, "Invalid msgexpirytime value in %s (line %d), using default\n", config_file, v->lineno);
 576                                 msg_expiry = SMDI_MSG_EXPIRY_TIME;
 577                         }
 578                 } else if (!strcasecmp(v->name, "paritybit")) {
 579                         if (!strcasecmp(v->value, "even"))
 580                                 paritybit = PARENB;
 581                         else if (!strcasecmp(v->value, "odd"))
 582                                 paritybit = PARENB | PARODD;
 583                         else if (!strcasecmp(v->value, "none"))
 584                                 paritybit = ~PARENB;
 585                         else {
 586                                 ast_log(LOG_NOTICE, "Invalid parity bit setting in %s (line %d), using default\n", config_file, v->lineno);
 587                                 paritybit = PARENB;
 588                         }
 589                 } else if (!strcasecmp(v->name, "charsize")) {
 590                         if (!strcasecmp(v->value, "7"))
 591                                 charsize = CS7;
 592                         else if (!strcasecmp(v->value, "8"))
 593                                 charsize = CS8;
 594                         else {
 595                                 ast_log(LOG_NOTICE, "Invalid character size setting in %s (line %d), using default\n", config_file, v->lineno);
 596                                 charsize = CS7;
 597                         }
 598                 } else if (!strcasecmp(v->name, "twostopbits")) {
 599                         stopbits = ast_true(v->name);
 600                 } else if (!strcasecmp(v->name, "smdiport")) {
 601                         if (reload) {
 602                                 /* we are reloading, check if we are already
 603                                  * monitoring this interface, if we are we do
 604                                  * not want to start it again.  This also has
 605                                  * the side effect of not updating different
 606                                  * setting for the serial port, but it should
 607                                  * be trivial to rewrite this section so that
 608                                  * options on the port are changed without
 609                                  * restarting the interface.  Or the interface
 610                                  * could be restarted with out emptying the
 611                                  * queue. */
 612                                 if ((iface = ASTOBJ_CONTAINER_FIND(&smdi_ifaces, v->value))) {
 613                                         ast_log(LOG_NOTICE, "SMDI interface %s already running, not restarting\n", iface->name);
 614                                         ASTOBJ_UNMARK(iface);
 615                                         ASTOBJ_UNREF(iface, ast_smdi_interface_destroy);
 616                                         continue;
 617                                 }
 618                         }
 619
 620                         if (!(iface = ast_calloc(1, sizeof(*iface))))
 621                                 continue;
 622
 623                         ASTOBJ_INIT(iface);
 624                         ASTOBJ_CONTAINER_INIT(&iface->md_q);
 625                         ASTOBJ_CONTAINER_INIT(&iface->mwi_q);
 626
 627                         ast_copy_string(iface->name, v->value, sizeof(iface->name));
 628
 629                         if (!(iface->file = fopen(iface->name, "r"))) {
 630                                 ast_log(LOG_ERROR, "Error opening SMDI interface %s (%s)\n", iface->name, strerror(errno));
 631                                 ASTOBJ_UNREF(iface, ast_smdi_interface_destroy);
 632                                 continue;
 633                         }
 634
 635                         iface->fd = fileno(iface->file);
 636
 637                         /* Set the proper attributes for our serial port. */
 638
 639                         /* get the current attributes from the port */
 640                         if (tcgetattr(iface->fd, &iface->mode)) {
 641                                 ast_log(LOG_ERROR, "Error getting atributes of %s (%s)\n", iface->name, strerror(errno));
 642                                 ASTOBJ_UNREF(iface, ast_smdi_interface_destroy);
 643                                 continue;
 644                         }
 645
 646                         /* set the desired speed */
 647                         if (cfsetispeed(&iface->mode, baud_rate) || cfsetospeed(&iface->mode, baud_rate)) {
 648                                 ast_log(LOG_ERROR, "Error setting baud rate on %s (%s)\n", iface->name, strerror(errno));
 649                                 ASTOBJ_UNREF(iface, ast_smdi_interface_destroy);
 650                                 continue;
 651                         }
 652
 653                         /* set the stop bits */
 654                         if (stopbits)
 655                            iface->mode.c_cflag = iface->mode.c_cflag | CSTOPB;   /* set two stop bits */
 656                         else
 657                            iface->mode.c_cflag = iface->mode.c_cflag & ~CSTOPB;  /* set one stop bit */
 658
 659                         /* set the parity */
 660                         iface->mode.c_cflag = (iface->mode.c_cflag & ~PARENB & ~PARODD) | paritybit;
 661
 662                         /* set the character size */
 663                         iface->mode.c_cflag = (iface->mode.c_cflag & ~CSIZE) | charsize;
 664
 665                         /* commit the desired attributes */
 666                         if (tcsetattr(iface->fd, TCSAFLUSH, &iface->mode)) {
 667                                 ast_log(LOG_ERROR, "Error setting attributes on %s (%s)\n", iface->name, strerror(errno));
 668                                 ASTOBJ_UNREF(iface, ast_smdi_interface_destroy);
 669                                 continue;
 670                         }
 671
 672                         /* set the msdstrip */
 673                         iface->msdstrip = msdstrip;
 674
 675                         /* set the message expiry time */
 676                         iface->msg_expiry = msg_expiry;
 677
 678                         /* start the listner thread */
 679                         if (option_verbose > 2)
 680                                 ast_verbose(VERBOSE_PREFIX_3 "Starting SMDI monitor thread for %s\n", iface->name);
 681                         if (ast_pthread_create_background(&iface->thread, NULL, smdi_read, iface)) {
 682                                 ast_log(LOG_ERROR, "Error starting SMDI monitor thread for %s\n", iface->name);
 683                                 ASTOBJ_UNREF(iface, ast_smdi_interface_destroy);
 684                                 continue;
 685                         }
 686
 687                         ASTOBJ_CONTAINER_LINK(&smdi_ifaces, iface);
 688                         ASTOBJ_UNREF(iface, ast_smdi_interface_destroy);
 689                         ast_module_ref(ast_module_info->self);
 690                 } else {
 691                         ast_log(LOG_NOTICE, "Ignoring unknown option %s in %s\n", v->name, config_file);
 692                 }
 693         }
 694         ast_config_destroy(conf);
 695
 696         /* Prune any interfaces we should no longer monitor. */
 697         if (reload)
 698                 ASTOBJ_CONTAINER_PRUNE_MARKED(&smdi_ifaces, ast_smdi_interface_destroy);
 699
 700         ASTOBJ_CONTAINER_RDLOCK(&smdi_ifaces);
 701         /* TODO: this is bad, we need an ASTOBJ method for this! */
 702         if (!smdi_ifaces.head)
 703                 res = 1;
 704         ASTOBJ_CONTAINER_UNLOCK(&smdi_ifaces);
 705
 706         return res;
 707 }
 708
 709 static int load_module(void)
 710 {
 711         int res;
 712
 713         /* initialize our containers */
 714         memset(&smdi_ifaces, 0, sizeof(smdi_ifaces));
 715         ASTOBJ_CONTAINER_INIT(&smdi_ifaces);
 716
 717         /* load the config and start the listener threads*/
 718         res = smdi_load(0);
 719         if (res < 0) {
 720                 return res;
 721         } else if (res == 1) {
 722                 ast_log(LOG_WARNING, "No SMDI interfaces are available to listen on, not starting SDMI listener.\n");
 723                 return AST_MODULE_LOAD_DECLINE;;
 724         } else
 725                 return 0;
 726 }
 727
 728 static int unload_module(void)
 729 {
 730         /* this destructor stops any running smdi_read threads */
 731         ASTOBJ_CONTAINER_DESTROYALL(&smdi_ifaces, ast_smdi_interface_destroy);
 732         ASTOBJ_CONTAINER_DESTROY(&smdi_ifaces);
 733
 734         return 0;
 735 }
 736
 737 static int reload(void)
 738 {
 739         int res;
 740
 741         res = smdi_load(1);
 742
 743         if (res < 0) {
 744                 return res;
 745         } else if (res == 1) {
 746                 ast_log(LOG_WARNING, "No SMDI interfaces were specified to listen on, not starting SDMI listener.\n");
 747                 return 0;
 748         } else
 749                 return 0;
 750 }
 751
 752 AST_MODULE_INFO(ASTERISK_GPL_KEY, AST_MODFLAG_GLOBAL_SYMBOLS, "Simplified Message Desk Interface (SMDI) Resource",
 753                 .load = load_module,
 754                 .unload = unload_module,
 755                 .reload = reload,
 756                );