pbx_config.c

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/*
 * Asterisk -- An open source telephony toolkit.
 *
 * Copyright (C) 1999 - 2006, Digium, Inc.
 *
 * Mark Spencer <markster@digium.com>
 *
 * See http://www.asterisk.org for more information about
 * the Asterisk project. Please do not directly contact
 * any of the maintainers of this project for assistance;
 * the project provides a web site, mailing lists and IRC
 * channels for your use.
 *
 * This program is free software, distributed under the terms of
 * the GNU General Public License Version 2. See the LICENSE file
 * at the top of the source tree.
 */

/*! \file
 *
 * \brief Populate and remember extensions from static config file
 *
 * 
 */

/*** MODULEINFO
   <support_level>core</support_level>
 ***/

#include "asterisk.h"

ASTERISK_FILE_VERSION(__FILE__, "$Revision: 354218 $")

#include <ctype.h>

#include "asterisk/paths.h"   /* ast_config_AST_CONFIG_DIR */
#include "asterisk/pbx.h"
#include "asterisk/config.h"
#include "asterisk/module.h"
#include "asterisk/logger.h"
#include "asterisk/cli.h"
#include "asterisk/channel.h" /* AST_MAX_EXTENSION */
#include "asterisk/callerid.h"

static const char config[] = "extensions.conf";
static const char registrar[] = "pbx_config";
static char userscontext[AST_MAX_EXTENSION] = "default";

static int static_config = 0;
static int write_protect_config = 1;
static int autofallthrough_config = 1;
static int clearglobalvars_config = 0;
static int extenpatternmatchnew_config = 0;
static char *overrideswitch_config = NULL;

AST_MUTEX_DEFINE_STATIC(save_dialplan_lock);

static struct ast_context *local_contexts = NULL;
static struct ast_hashtab *local_table = NULL;
/*
 * Prototypes for our completion functions
 */
static char *complete_dialplan_remove_include(struct ast_cli_args *);
static char *complete_dialplan_add_include(struct ast_cli_args *);
static char *complete_dialplan_remove_ignorepat(struct ast_cli_args *);
static char *complete_dialplan_add_ignorepat(struct ast_cli_args *);
static char *complete_dialplan_remove_extension(struct ast_cli_args *);
static char *complete_dialplan_add_extension(struct ast_cli_args *);

/*
 * Implementation of functions provided by this module
 */

/*!
 * REMOVE INCLUDE command stuff
 */
static char *handle_cli_dialplan_remove_include(struct ast_cli_entry *e, int cmd, struct ast_cli_args *a)
{
   switch (cmd) {
   case CLI_INIT:
      e->command = "dialplan remove include";
      e->usage =
         "Usage: dialplan remove include <context> from <context>\n"
         "       Remove an included context from another context.\n";
      return NULL;
   case CLI_GENERATE:
      return complete_dialplan_remove_include(a);
   }

   if (a->argc != 6 || strcmp(a->argv[4], "from"))
      return CLI_SHOWUSAGE;

   if (!ast_context_remove_include(a->argv[5], a->argv[3], registrar)) {
      ast_cli(a->fd, "We are not including '%s' into '%s' now\n",
         a->argv[3], a->argv[5]);
      return CLI_SUCCESS;
   }

   ast_cli(a->fd, "Failed to remove '%s' include from '%s' context\n",
      a->argv[3], a->argv[5]);
   return CLI_FAILURE;
}

/*! \brief return true if 'name' is included by context c */
static int lookup_ci(struct ast_context *c, const char *name)
{
   struct ast_include *i = NULL;

   if (ast_rdlock_context(c)) /* error, skip */
      return 0;
   while ( (i = ast_walk_context_includes(c, i)) )
      if (!strcmp(name, ast_get_include_name(i)))
         break;
   ast_unlock_context(c);
   return i ? -1 /* success */ : 0;
}

/*! \brief return true if 'name' is in the ignorepats for context c */
static int lookup_c_ip(struct ast_context *c, const char *name)
{
   struct ast_ignorepat *ip = NULL;

   if (ast_rdlock_context(c)) /* error, skip */
      return 0;
   while ( (ip = ast_walk_context_ignorepats(c, ip)) )
      if (!strcmp(name, ast_get_ignorepat_name(ip)))
         break;
   ast_unlock_context(c);
   return ip ? -1 /* success */ : 0;
}

/*! \brief moves to the n-th word in the string, or empty string if none */
static const char *skip_words(const char *p, int n)
{
   int in_blank = 0;
   for (;n && *p; p++) {
      if (isblank(*p) /* XXX order is important */ && !in_blank) {
         n--;  /* one word is gone */
         in_blank = 1;
      } else if (/* !is_blank(*p), we know already, && */ in_blank) {
         in_blank = 0;
      }
   }
   return p;
}

/*! \brief match the first 'len' chars of word. len==0 always succeeds */
static int partial_match(const char *s, const char *word, int len)
{
   return (len == 0 || !strncmp(s, word, len));
}

/*! \brief split extension\@context in two parts, return -1 on error.
 * The return string is malloc'ed and pointed by *ext
 */
static int split_ec(const char *src, char **ext, char ** const ctx, char ** const cid)
{
   char *i, *c, *e = ast_strdup(src); /* now src is not used anymore */

   if (e == NULL)
      return -1;  /* malloc error */
   /* now, parse values from 'exten@context' */
   *ext = e;
   c = strchr(e, '@');
   if (c == NULL) /* no context part */
      *ctx = "";  /* it is not overwritten, anyways */
   else {   /* found context, check for duplicity ... */
      *c++ = '\0';
      *ctx = c;
      if (strchr(c, '@')) { /* two @, not allowed */
         free(e);
         return -1;
      }
   }
   if (cid && (i = strchr(e, '/'))) {
      *i++ = '\0';
      *cid = i;
   } else if (cid) {
      /* Signal none detected */
      *cid = NULL;
   }
   return 0;
}

/* _X_ is the string we need to complete */
static char *complete_dialplan_remove_include(struct ast_cli_args *a)
{
   int which = 0;
   char *res = NULL;
   int len = strlen(a->word); /* how many bytes to match */
   struct ast_context *c = NULL;

   if (a->pos == 3) {      /* "dialplan remove include _X_" */
      if (ast_wrlock_contexts()) {
         ast_log(LOG_ERROR, "Failed to lock context list\n");
         return NULL;
      }
      /* walk contexts and their includes, return the n-th match */
      while (!res && (c = ast_walk_contexts(c))) {
         struct ast_include *i = NULL;

         if (ast_rdlock_context(c)) /* error ? skip this one */
            continue;

         while ( !res && (i = ast_walk_context_includes(c, i)) ) {
            const char *i_name = ast_get_include_name(i);
            struct ast_context *nc = NULL;
            int already_served = 0;

            if (!partial_match(i_name, a->word, len))
               continue;   /* not matched */

            /* check if this include is already served or not */

            /* go through all contexts again till we reach actual
             * context or already_served = 1
             */
            while ( (nc = ast_walk_contexts(nc)) && nc != c && !already_served)
               already_served = lookup_ci(nc, i_name);

            if (!already_served && ++which > a->n)
               res = strdup(i_name);
         }
         ast_unlock_context(c);
      }

      ast_unlock_contexts();
      return res;
   } else if (a->pos == 4) { /* "dialplan remove include CTX _X_" */
      /*
       * complete as 'from', but only if previous context is really
       * included somewhere
       */
      char *context, *dupline;
      const char *s = skip_words(a->line, 3); /* skip 'dialplan' 'remove' 'include' */

      if (a->n > 0)
         return NULL;
      context = dupline = strdup(s);
      if (!dupline) {
         ast_log(LOG_ERROR, "Out of free memory\n");
         return NULL;
      }
      strsep(&dupline, " ");

      if (ast_rdlock_contexts()) {
         ast_log(LOG_ERROR, "Failed to lock contexts list\n");
         free(context);
         return NULL;
      }

      /* go through all contexts and check if is included ... */
      while (!res && (c = ast_walk_contexts(c)))
         if (lookup_ci(c, context)) /* context is really included, complete "from" command */
            res = strdup("from");
      ast_unlock_contexts();
      if (!res)
         ast_log(LOG_WARNING, "%s not included anywhere\n", context);
      free(context);
      return res;
   } else if (a->pos == 5) { /* "dialplan remove include CTX from _X_" */
      /*
       * Context from which we removing include ... 
       */
      char *context, *dupline, *from;
      const char *s = skip_words(a->line, 3); /* skip 'dialplan' 'remove' 'include' */
      context = dupline = strdup(s);
      if (!dupline) {
         ast_log(LOG_ERROR, "Out of free memory\n");
         return NULL;
      }

      strsep(&dupline, " "); /* skip context */

      /* fourth word must be 'from' */
      from = strsep(&dupline, " ");
      if (!from || strcmp(from, "from")) {
         free(context);
         return NULL;
      }

      if (ast_rdlock_contexts()) {
         ast_log(LOG_ERROR, "Failed to lock context list\n");
         free(context);
         return NULL;
      }

      /* walk through all contexts ... */
      c = NULL;
      while ( !res && (c = ast_walk_contexts(c))) {
         const char *c_name = ast_get_context_name(c);
         if (!partial_match(c_name, a->word, len)) /* not a good target */
            continue;
         /* walk through all includes and check if it is our context */ 
         if (lookup_ci(c, context) && ++which > a->n)
            res = strdup(c_name);
      }
      ast_unlock_contexts();
      free(context);
      return res;
   }

   return NULL;
}

/*!
 * REMOVE EXTENSION command stuff
 */
static char *handle_cli_dialplan_remove_extension(struct ast_cli_entry *e, int cmd, struct ast_cli_args *a)
{
   int removing_priority = 0;
   char *exten, *context, *cid;
   char *ret = CLI_FAILURE;

   switch (cmd) {
   case CLI_INIT:
      e->command = "dialplan remove extension";
      e->usage =
         "Usage: dialplan remove extension exten[/cid]@context [priority]\n"
         "       Remove an extension from a given context. If a priority\n"
         "       is given, only that specific priority from the given extension\n"
         "       will be removed.\n";
      return NULL;
   case CLI_GENERATE:
      return complete_dialplan_remove_extension(a);
   }

   if (a->argc != 5 && a->argc != 4)
      return CLI_SHOWUSAGE;

   /*
    * Priority input checking ...
    */
   if (a->argc == 5) {
      const char *c = a->argv[4];

      /* check for digits in whole parameter for right priority ...
       * why? because atoi (strtol) returns 0 if any characters in
       * string and whole extension will be removed, it's not good
       */
      if (!strcmp("hint", c))
         removing_priority = PRIORITY_HINT;
      else {
         while (*c && isdigit(*c))
            c++;
         if (*c) { /* non-digit in string */
            ast_cli(a->fd, "Invalid priority '%s'\n", a->argv[4]);
            return CLI_FAILURE;
         }
         removing_priority = atoi(a->argv[4]);
      }

      if (removing_priority == 0) {
         ast_cli(a->fd, "If you want to remove whole extension, please " \
            "omit priority argument\n");
         return CLI_FAILURE;
      }
   }

   /* XXX original overwrote argv[3] */
   /*
    * Format exten@context checking ...
    */
   if (split_ec(a->argv[3], &exten, &context, &cid))
      return CLI_FAILURE; /* XXX malloc failure */
   if ((!strlen(exten)) || (!(strlen(context)))) {
      ast_cli(a->fd, "Missing extension or context name in third argument '%s'\n",
         a->argv[3]);
      free(exten);
      return CLI_FAILURE;
   }

   if (!ast_context_remove_extension_callerid(context, exten, removing_priority,
         /* Do NOT substitute S_OR; it is NOT the same thing */
         cid ? cid : (removing_priority ? "" : NULL), cid ? 1 : 0, registrar)) {
      if (!removing_priority)
         ast_cli(a->fd, "Whole extension %s@%s removed\n",
            exten, context);
      else
         ast_cli(a->fd, "Extension %s@%s with priority %d removed\n",
            exten, context, removing_priority);
         
      ret = CLI_SUCCESS;
   } else {
      if (cid) {
         ast_cli(a->fd, "Failed to remove extension %s/%s@%s\n", exten, cid, context);
      } else {
         ast_cli(a->fd, "Failed to remove extension %s@%s\n", exten, context);
      }
      ret = CLI_FAILURE;
   }
   free(exten);
   return ret;
}

static char *complete_dialplan_remove_extension(struct ast_cli_args *a)
{
   char *ret = NULL;
   int which = 0;

   if (a->pos == 3) { /* 'dialplan remove extension _X_' (exten@context ... */
      struct ast_context *c = NULL;
      char *context = NULL, *exten = NULL, *cid = NULL;
      int le = 0; /* length of extension */
      int lc = 0; /* length of context */
      int lcid = 0; /* length of cid */

      lc = split_ec(a->word, &exten, &context, &cid);
      if (lc)  { /* error */
         return NULL;
      }
      le = strlen(exten);
      lc = strlen(context);
      lcid = cid ? strlen(cid) : -1;

      if (ast_rdlock_contexts()) {
         ast_log(LOG_ERROR, "Failed to lock context list\n");
         goto error2;
      }

      /* find our context ... */
      while ( (c = ast_walk_contexts(c)) ) { /* match our context if any */
         struct ast_exten *e = NULL;
         /* XXX locking ? */
         if (!partial_match(ast_get_context_name(c), context, lc))
            continue;   /* context not matched */
         while ( (e = ast_walk_context_extensions(c, e)) ) { /* try to complete extensions ... */
            if ( !strchr(a->word, '/') ||
                  (!strchr(a->word, '@') && partial_match(ast_get_extension_cidmatch(e), cid, lcid)) ||
                  (strchr(a->word, '@') && !strcmp(ast_get_extension_cidmatch(e), cid))) {
               if ( ((strchr(a->word, '/') || strchr(a->word, '@')) && !strcmp(ast_get_extension_name(e), exten)) ||
                   (!strchr(a->word, '/') && !strchr(a->word, '@') && partial_match(ast_get_extension_name(e), exten, le))) { /* n-th match */
                  if (++which > a->n) {
                     /* If there is an extension then return exten@context. */
                     if (ast_get_extension_matchcid(e) && (!strchr(a->word, '@') || strchr(a->word, '/'))) {
                        if (asprintf(&ret, "%s/%s@%s", ast_get_extension_name(e), ast_get_extension_cidmatch(e), ast_get_context_name(c)) < 0) {
                           ast_log(LOG_WARNING, "asprintf() failed: %s\n", strerror(errno));
                           ret = NULL;
                        }
                        break;
                     } else if (!ast_get_extension_matchcid(e) && !strchr(a->word, '/')) {
                        if (asprintf(&ret, "%s@%s", ast_get_extension_name(e), ast_get_context_name(c)) < 0) {
                           ast_log(LOG_WARNING, "asprintf() failed: %s\n", strerror(errno));
                           ret = NULL;
                        }
                        break;
                     }
                  }
               }
            }
         }
         if (e)   /* got a match */
            break;
      }

      ast_unlock_contexts();
   error2:
      free(exten);
   } else if (a->pos == 4) { /* 'dialplan remove extension EXT _X_' (priority) */
      char *exten = NULL, *context, *cid, *p;
      struct ast_context *c;
      int le, lc, len;
      const char *s = skip_words(a->line, 3); /* skip 'dialplan' 'remove' 'extension' */
      int i = split_ec(s, &exten, &context, &cid); /* parse ext@context */

      if (i)   /* error */
         goto error3;
      if ( (p = strchr(exten, ' ')) ) /* remove space after extension */
         *p = '\0';
      if ( (p = strchr(context, ' ')) ) /* remove space after context */
         *p = '\0';
      le = strlen(exten);
      lc = strlen(context);
      len = strlen(a->word);
      if (le == 0 || lc == 0)
         goto error3;

      if (ast_rdlock_contexts()) {
         ast_log(LOG_ERROR, "Failed to lock context list\n");
         goto error3;
      }

      /* walk contexts */
      c = NULL;
      while ( (c = ast_walk_contexts(c)) ) {
         /* XXX locking on c ? */
         struct ast_exten *e;
         if (strcmp(ast_get_context_name(c), context) != 0)
            continue;
         /* got it, we must match here */
         e = NULL;
         while ( (e = ast_walk_context_extensions(c, e)) ) {
            struct ast_exten *priority;
            char buffer[10];

            if (cid && strcmp(ast_get_extension_cidmatch(e), cid) != 0) {
               continue;
            }
            if (strcmp(ast_get_extension_name(e), exten) != 0)
               continue;
            /* XXX lock e ? */
            priority = NULL;
            while ( !ret && (priority = ast_walk_extension_priorities(e, priority)) ) {
               snprintf(buffer, sizeof(buffer), "%u", ast_get_extension_priority(priority));
               if (partial_match(buffer, a->word, len) && ++which > a->n) /* n-th match */
                  ret = strdup(buffer);
            }
            break;
         }
         break;
      }
      ast_unlock_contexts();
   error3:
      free(exten);
   }
   return ret; 
}

/*!
 * Include context ...
 */
static char *handle_cli_dialplan_add_include(struct ast_cli_entry *e, int cmd, struct ast_cli_args *a)
{
   switch (cmd) {
   case CLI_INIT:
      e->command = "dialplan add include";
      e->usage =
         "Usage: dialplan add include <context> into <context>\n"
         "       Include a context in another context.\n";
      return NULL;
   case CLI_GENERATE:
      return complete_dialplan_add_include(a);
   }

   if (a->argc != 6) /* dialplan add include CTX in CTX */
      return CLI_SHOWUSAGE;

   /* fifth arg must be 'into' ... */
   if (strcmp(a->argv[4], "into"))
      return CLI_SHOWUSAGE;

   if (ast_context_add_include(a->argv[5], a->argv[3], registrar)) {
      switch (errno) {
      case ENOMEM:
         ast_cli(a->fd, "Out of memory for context addition\n");
         break;

      case EBUSY:
         ast_cli(a->fd, "Failed to lock context(s) list, please try again later\n");
         break;

      case EEXIST:
         ast_cli(a->fd, "Context '%s' already included in '%s' context\n",
            a->argv[3], a->argv[5]);
         break;

      case ENOENT:
      case EINVAL:
         ast_cli(a->fd, "There is no existence of context '%s'\n",
            errno == ENOENT ? a->argv[5] : a->argv[3]);
         break;

      default:
         ast_cli(a->fd, "Failed to include '%s' in '%s' context\n",
            a->argv[3], a->argv[5]);
         break;
      }
      return CLI_FAILURE;
   }

   /* show some info ... */
   ast_cli(a->fd, "Context '%s' included in '%s' context\n",
      a->argv[3], a->argv[5]);

   return CLI_SUCCESS;
}

static char *complete_dialplan_add_include(struct ast_cli_args *a)
{
   struct ast_context *c;
   int which = 0;
   char *ret = NULL;
   int len = strlen(a->word);

   if (a->pos == 3) {      /* 'dialplan add include _X_' (context) ... */
      if (ast_rdlock_contexts()) {
         ast_log(LOG_ERROR, "Failed to lock context list\n");
         return NULL;
      }
      for (c = NULL; !ret && (c = ast_walk_contexts(c)); )
         if (partial_match(ast_get_context_name(c), a->word, len) && ++which > a->n)
            ret = strdup(ast_get_context_name(c));
      ast_unlock_contexts();
      return ret;
   } else if (a->pos == 4) { /* dialplan add include CTX _X_ */
      /* complete  as 'into' if context exists or we are unable to check */
      char *context, *dupline;
      const char *s = skip_words(a->line, 3); /* should not fail */

      if (a->n != 0) /* only once */
         return NULL;

      /* parse context from line ... */
      context = dupline = strdup(s);
      if (!context) {
         ast_log(LOG_ERROR, "Out of free memory\n");
         return strdup("into");
      }
      strsep(&dupline, " ");

      /* check for context existence ... */
      if (ast_rdlock_contexts()) {
         ast_log(LOG_ERROR, "Failed to lock context list\n");
         /* our fault, we can't check, so complete 'into' ... */
         ret = strdup("into");
      } else {
         struct ast_context *ctx;
         for (ctx = NULL; !ret && (ctx = ast_walk_contexts(ctx)); )
            if (!strcmp(context, ast_get_context_name(ctx)))
               ret = strdup("into"); /* found */
         ast_unlock_contexts();
      }
      free(context);
      return ret;
   } else if (a->pos == 5) { /* 'dialplan add include CTX into _X_' (dst context) */
      char *context, *dupline, *into;
      const char *s = skip_words(a->line, 3); /* should not fail */
      context = dupline = strdup(s);
      if (!dupline) {
         ast_log(LOG_ERROR, "Out of free memory\n");
         return NULL;
      }
      strsep(&dupline, " "); /* skip context */
      into = strsep(&dupline, " ");
      /* error if missing context or fifth word is not 'into' */
      if (!strlen(context) || strcmp(into, "into")) {
         ast_log(LOG_ERROR, "bad context %s or missing into %s\n",
            context, into);
         goto error3;
      }

      if (ast_rdlock_contexts()) {
         ast_log(LOG_ERROR, "Failed to lock context list\n");
         goto error3;
      }

      for (c = NULL; (c = ast_walk_contexts(c)); )
         if (!strcmp(context, ast_get_context_name(c)))
            break;
      if (c) { /* first context exists, go on... */
         /* go through all contexts ... */
         for (c = NULL; !ret && (c = ast_walk_contexts(c)); ) {
            if (!strcmp(context, ast_get_context_name(c)))
               continue; /* skip ourselves */
            if (partial_match(ast_get_context_name(c), a->word, len) &&
                  !lookup_ci(c, context) /* not included yet */ &&
                  ++which > a->n)
               ret = strdup(ast_get_context_name(c));
         }
      } else {
         ast_log(LOG_ERROR, "context %s not found\n", context);
      }
      ast_unlock_contexts();
   error3:
      free(context);
      return ret;
   }

   return NULL;
}

/*!
 * \brief 'save dialplan' CLI command implementation functions ...
 */
static char *handle_cli_dialplan_save(struct ast_cli_entry *e, int cmd, struct ast_cli_args *a)
{
   char filename[256], overrideswitch[256] = "";
   struct ast_context *c;
   struct ast_config *cfg;
   struct ast_variable *v;
   int incomplete = 0; /* incomplete config write? */
   FILE *output;
   struct ast_flags config_flags = { 0 };
   const char *base, *slash;

   switch (cmd) {
   case CLI_INIT:
      e->command = "dialplan save";
      e->usage =
         "Usage: dialplan save [/path/to/extension/file]\n"
         "       Save dialplan created by pbx_config module.\n"
         "\n"
         "Example: dialplan save                 (/etc/asterisk/extensions.conf)\n"
         "         dialplan save /home/markster  (/home/markster/extensions.conf)\n";
      return NULL;
   case CLI_GENERATE:
      return NULL;
   }

   if (! (static_config && !write_protect_config)) {
      ast_cli(a->fd,
         "I can't save dialplan now, see '%s' example file.\n",
         config);
      return CLI_FAILURE;
   }

   if (a->argc != 2 && a->argc != 3)
      return CLI_SHOWUSAGE;

   if (ast_mutex_lock(&save_dialplan_lock)) {
      ast_cli(a->fd,
         "Failed to lock dialplan saving (another proccess saving?)\n");
      return CLI_FAILURE;
   }
   /* XXX the code here is quite loose, a pathname with .conf in it
    * is assumed to be a complete pathname
    */
   if (a->argc == 3) {  /* have config path. Look for *.conf */
      base = a->argv[2];
      if (!strstr(a->argv[2], ".conf")) { /*no, this is assumed to be a pathname */
         /* if filename ends with '/', do not add one */
         slash = (*(a->argv[2] + strlen(a->argv[2]) -1) == '/') ? "/" : "";
      } else { /* yes, complete file name */
         slash = "";
      }
   } else {
      /* no config file, default one */
      base = ast_config_AST_CONFIG_DIR;
      slash = "/";
   }
   snprintf(filename, sizeof(filename), "%s%s%s", base, slash, config);

   cfg = ast_config_load("extensions.conf", config_flags);

   /* try to lock contexts list */
   if (ast_rdlock_contexts()) {
      ast_cli(a->fd, "Failed to lock contexts list\n");
      ast_mutex_unlock(&save_dialplan_lock);
      ast_config_destroy(cfg);
      return CLI_FAILURE;
   }

   /* create new file ... */
   if (!(output = fopen(filename, "wt"))) {
      ast_cli(a->fd, "Failed to create file '%s'\n",
         filename);
      ast_unlock_contexts();
      ast_mutex_unlock(&save_dialplan_lock);
      ast_config_destroy(cfg);
      return CLI_FAILURE;
   }

   /* fireout general info */
   if (overrideswitch_config) {
      snprintf(overrideswitch, sizeof(overrideswitch), "overrideswitch=%s\n", overrideswitch_config);
   }
   fprintf(output, "[general]\nstatic=%s\nwriteprotect=%s\nautofallthrough=%s\nclearglobalvars=%s\n%sextenpatternmatchnew=%s\n\n",
      static_config ? "yes" : "no",
      write_protect_config ? "yes" : "no",
                autofallthrough_config ? "yes" : "no",
            clearglobalvars_config ? "yes" : "no",
            overrideswitch_config ? overrideswitch : "",
            extenpatternmatchnew_config ? "yes" : "no");

   if ((v = ast_variable_browse(cfg, "globals"))) {
      fprintf(output, "[globals]\n");
      while(v) {
         fprintf(output, "%s => %s\n", v->name, v->value);
         v = v->next;
      }
      fprintf(output, "\n");
   }

   ast_config_destroy(cfg);
   
#define PUT_CTX_HDR  do { \
   if (!context_header_written) {   \
      fprintf(output, "[%s]\n", ast_get_context_name(c));   \
      context_header_written = 1;   \
   }  \
   } while (0)

   /* walk all contexts */
   for (c = NULL; (c = ast_walk_contexts(c)); ) {
      int context_header_written = 0;
      struct ast_exten *ext, *last_written_e = NULL;
      struct ast_include *i;
      struct ast_ignorepat *ip;
      struct ast_sw *sw;

      /* try to lock context and fireout all info */  
      if (ast_rdlock_context(c)) { /* lock failure */
         incomplete = 1;
         continue;
      }
      /* registered by this module? */
      /* XXX do we need this ? */
      if (!strcmp(ast_get_context_registrar(c), registrar)) {
         fprintf(output, "[%s]\n", ast_get_context_name(c));
         context_header_written = 1;
      }

      /* walk extensions ... */
      for (ext = NULL; (ext = ast_walk_context_extensions(c, ext)); ) {
         struct ast_exten *p = NULL;

         /* fireout priorities */
         while ( (p = ast_walk_extension_priorities(ext, p)) ) {
            if (strcmp(ast_get_extension_registrar(p), registrar) != 0) /* not this source */
               continue;
      
            /* make empty line between different extensions */ 
            if (last_written_e != NULL &&
                   strcmp(ast_get_extension_name(last_written_e),
                      ast_get_extension_name(p)))
               fprintf(output, "\n");
            last_written_e = p;
         
            PUT_CTX_HDR;

            if (ast_get_extension_priority(p) == PRIORITY_HINT) { /* easy */
               fprintf(output, "exten => %s,hint,%s\n",
                      ast_get_extension_name(p),
                      ast_get_extension_app(p));
            } else {
               const char *sep, *cid;
               const char *el = ast_get_extension_label(p);
               char label[128] = "";
 
               if (ast_get_extension_matchcid(p)) {
                  sep = "/";
                  cid = ast_get_extension_cidmatch(p);
               } else
                  sep = cid = "";
            
               if (el && (snprintf(label, sizeof(label), "(%s)", el) != (strlen(el) + 2)))
                  incomplete = 1;   /* error encountered or label > 125 chars */
               
               fprintf(output, "exten => %s%s%s,%d%s,%s(%s)\n",
                   ast_get_extension_name(p), (ast_strlen_zero(sep) ? "" : sep), (ast_strlen_zero(cid) ? "" : cid),
                   ast_get_extension_priority(p), label,
                   ast_get_extension_app(p), (ast_strlen_zero(ast_get_extension_app_data(p)) ? "" : (const char *)ast_get_extension_app_data(p)));
            }
         }
      }

      /* written any extensions? ok, write space between exten & inc */
      if (last_written_e)
         fprintf(output, "\n");

      /* walk through includes */
      for (i = NULL; (i = ast_walk_context_includes(c, i)) ; ) {
         if (strcmp(ast_get_include_registrar(i), registrar) != 0)
            continue; /* not mine */
         PUT_CTX_HDR;
         fprintf(output, "include => %s\n", ast_get_include_name(i));
      }
      if (ast_walk_context_includes(c, NULL))
         fprintf(output, "\n");

      /* walk through switches */
      for (sw = NULL; (sw = ast_walk_context_switches(c, sw)) ; ) {
         if (strcmp(ast_get_switch_registrar(sw), registrar) != 0)
            continue; /* not mine */
         PUT_CTX_HDR;
         fprintf(output, "switch => %s/%s\n",
                ast_get_switch_name(sw), ast_get_switch_data(sw));
      }

      if (ast_walk_context_switches(c, NULL))
         fprintf(output, "\n");

      /* fireout ignorepats ... */
      for (ip = NULL; (ip = ast_walk_context_ignorepats(c, ip)); ) {
         if (strcmp(ast_get_ignorepat_registrar(ip), registrar) != 0)
            continue; /* not mine */
         PUT_CTX_HDR;
         fprintf(output, "ignorepat => %s\n",
                  ast_get_ignorepat_name(ip));
      }

      ast_unlock_context(c);
   }  

   ast_unlock_contexts();
   ast_mutex_unlock(&save_dialplan_lock);
   fclose(output);

   if (incomplete) {
      ast_cli(a->fd, "Saved dialplan is incomplete\n");
      return CLI_FAILURE;
   }

   ast_cli(a->fd, "Dialplan successfully saved into '%s'\n",
      filename);
   return CLI_SUCCESS;
}

/*!
 * \brief ADD EXTENSION command stuff
 */
static char *handle_cli_dialplan_add_extension(struct ast_cli_entry *e, int cmd, struct ast_cli_args *a)
{
   char *whole_exten;
   char *exten, *prior;
   int iprior = -2;
   char *cidmatch, *app, *app_data;
   char *start, *end;
   const char *into_context;

   switch (cmd) {
   case CLI_INIT:
      e->command = "dialplan add extension";
      e->usage =
         "Usage: dialplan add extension <exten>,<priority>,<app> into <context> [replace]\n"
         "\n"
         "       app can be either:\n"
         "         app-name\n"
         "         app-name(app-data)\n"
         "         app-name,<app-data>\n"
         "\n"
         "       This command will add the new extension into <context>.  If\n"
         "       an extension with the same priority already exists and the\n"
         "       'replace' option is given we will replace the extension.\n"
         "\n"
         "Example: dialplan add extension 6123,1,Dial,IAX/216.207.245.56/6123 into local\n"
         "         Now, you can dial 6123 and talk to Markster :)\n";
      return NULL;
   case CLI_GENERATE:
      return complete_dialplan_add_extension(a);
   }

   /* check for arguments at first */
   if (a->argc != 6 && a->argc != 7)
      return CLI_SHOWUSAGE;
   if (strcmp(a->argv[4], "into"))
      return CLI_SHOWUSAGE;
   if (a->argc == 7)
      if (strcmp(a->argv[6], "replace"))
         return CLI_SHOWUSAGE;

   whole_exten = ast_strdupa(a->argv[3]);
   exten = strsep(&whole_exten,",");
   if (strchr(exten, '/')) {
      cidmatch = exten;
      strsep(&cidmatch,"/");
   } else {
      cidmatch = NULL;
   }
   prior = strsep(&whole_exten,",");
   if (prior) {
      if (!strcmp(prior, "hint")) {
         iprior = PRIORITY_HINT;
      } else {
         if (sscanf(prior, "%30d", &iprior) != 1) {
            ast_cli(a->fd, "'%s' is not a valid priority\n", prior);
            prior = NULL;
         }
      }
   }
   app = whole_exten;
   if (app) {
      if ((start = strchr(app, '(')) && (end = strrchr(app, ')'))) {
         *start = *end = '\0';
         app_data = start + 1;
      } else {
         app_data = strchr(app, ',');
         if (app_data) {
            *app_data++ = '\0';
         }
      }
   } else {
      app_data = NULL;
   }

   if (!exten || !prior || !app) {
      return CLI_SHOWUSAGE;
   }

   if (!app_data) {
      app_data = "";
   }
   into_context = a->argv[5];

   if (!ast_context_find(into_context)) {
      ast_cli(a->fd, "Context '%s' did not exist prior to add extension - the context will be created.\n", into_context);
   }

   if (!ast_context_find_or_create(NULL, NULL, into_context, registrar)) {
      ast_cli(a->fd, "Failed to add '%s,%s,%s(%s)' extension into '%s' context\n",
         exten, prior, app, app_data, into_context);
      return CLI_FAILURE;
   }

   if (ast_add_extension(into_context, a->argc == 7 ? 1 : 0, exten, iprior, NULL, cidmatch, app,
      ast_strdup(app_data), ast_free_ptr, registrar)) {
      switch (errno) {
      case ENOMEM:
         ast_cli(a->fd, "Out of free memory\n");
         break;

      case EBUSY:
         ast_cli(a->fd, "Failed to lock context(s) list, please try again later\n");
         break;

      case ENOENT:
         ast_cli(a->fd, "No existence of '%s' context\n", into_context);
         break;

      case EEXIST:
         ast_cli(a->fd, "Extension %s@%s with priority %s already exists\n",
            exten, into_context, prior);
         break;

      default:
         ast_cli(a->fd, "Failed to add '%s,%s,%s(%s)' extension into '%s' context\n",
               exten, prior, app, app_data, into_context);
         break;
      }
      return CLI_FAILURE;
   }

   if (a->argc == 7) {
      ast_cli(a->fd, "Extension %s@%s (%s) replace by '%s,%s,%s(%s)'\n",
         exten, into_context, prior, exten, prior, app, app_data);
   } else {
      ast_cli(a->fd, "Extension '%s,%s,%s(%s)' added into '%s' context\n",
         exten, prior, app, app_data, into_context);
   }

   return CLI_SUCCESS;
}

/*! dialplan add extension 6123,1,Dial,IAX/212.71.138.13/6123 into local */
static char *complete_dialplan_add_extension(struct ast_cli_args *a)
{
   int which = 0;

   if (a->pos == 4) {      /* complete 'into' word ... */
      return (a->n == 0) ? strdup("into") : NULL;
   } else if (a->pos == 5) { /* complete context */
      struct ast_context *c = NULL;
      int len = strlen(a->word);
      char *res = NULL;

      /* try to lock contexts list ... */
      if (ast_rdlock_contexts()) {
         ast_log(LOG_WARNING, "Failed to lock contexts list\n");
         return NULL;
      }

      /* walk through all contexts */
      while ( !res && (c = ast_walk_contexts(c)) )
         if (partial_match(ast_get_context_name(c), a->word, len) && ++which > a->n)
            res = strdup(ast_get_context_name(c));
      ast_unlock_contexts();
      return res;
   } else if (a->pos == 6) {
      return a->n == 0 ? strdup("replace") : NULL;
   }
   return NULL;
}

/*!
 * IGNOREPAT CLI stuff
 */
static char *handle_cli_dialplan_add_ignorepat(struct ast_cli_entry *e, int cmd, struct ast_cli_args *a)
{
   switch (cmd) {
   case CLI_INIT:
      e->command = "dialplan add ignorepat";
      e->usage =
         "Usage: dialplan add ignorepat <pattern> into <context>\n"
         "       This command adds a new ignore pattern into context <context>\n"
         "\n"
         "Example: dialplan add ignorepat _3XX into local\n";
      return NULL;
   case CLI_GENERATE:
      return complete_dialplan_add_ignorepat(a);
   }

   if (a->argc != 6)
      return CLI_SHOWUSAGE;

   if (strcmp(a->argv[4], "into"))
      return CLI_SHOWUSAGE;

   if (ast_context_add_ignorepat(a->argv[5], a->argv[3], registrar)) {
      switch (errno) {
      case ENOMEM:
         ast_cli(a->fd, "Out of free memory\n");
         break;

      case ENOENT:
         ast_cli(a->fd, "There is no existence of '%s' context\n", a->argv[5]);
         break;

      case EEXIST:
         ast_cli(a->fd, "Ignore pattern '%s' already included in '%s' context\n",
            a->argv[3], a->argv[5]);
         break;

      case EBUSY:
         ast_cli(a->fd, "Failed to lock context(s) list, please, try again later\n");
         break;

      default:
         ast_cli(a->fd, "Failed to add ingore pattern '%s' into '%s' context\n",
            a->argv[3], a->argv[5]);
         break;
      }
      return CLI_FAILURE;
   }

   ast_cli(a->fd, "Ignore pattern '%s' added into '%s' context\n",
      a->argv[3], a->argv[5]);

   return CLI_SUCCESS;
}

static char *complete_dialplan_add_ignorepat(struct ast_cli_args *a)
{
   if (a->pos == 4)
      return a->n == 0 ? strdup("into") : NULL;
   else if (a->pos == 5) {
      struct ast_context *c;
      int which = 0;
      char *dupline, *ignorepat = NULL;
      const char *s;
      char *ret = NULL;
      int len = strlen(a->word);

      /* XXX skip first three words 'dialplan' 'add' 'ignorepat' */
      s = skip_words(a->line, 3);
      if (s == NULL)
         return NULL;
      dupline = strdup(s);
      if (!dupline) {
         ast_log(LOG_ERROR, "Malloc failure\n");
         return NULL;
      }
      ignorepat = strsep(&dupline, " ");

      if (ast_rdlock_contexts()) {
         ast_log(LOG_ERROR, "Failed to lock contexts list\n");
         return NULL;
      }

      for (c = NULL; !ret && (c = ast_walk_contexts(c));) {
         int found = 0;

         if (!partial_match(ast_get_context_name(c), a->word, len))
            continue; /* not mine */
         if (ignorepat) /* there must be one, right ? */
            found = lookup_c_ip(c, ignorepat);
         if (!found && ++which > a->n)
            ret = strdup(ast_get_context_name(c));
      }

      free(ignorepat);
      ast_unlock_contexts();
      return ret;
   }

   return NULL;
}

static char *handle_cli_dialplan_remove_ignorepat(struct ast_cli_entry *e, int cmd, struct ast_cli_args *a)
{
   switch (cmd) {
   case CLI_INIT:
      e->command = "dialplan remove ignorepat";
      e->usage =
         "Usage: dialplan remove ignorepat <pattern> from <context>\n"
         "       This command removes an ignore pattern from context <context>\n"
         "\n"
         "Example: dialplan remove ignorepat _3XX from local\n";
      return NULL;
   case CLI_GENERATE:
      return complete_dialplan_remove_ignorepat(a);
   }

   if (a->argc != 6)
      return CLI_SHOWUSAGE;

   if (strcmp(a->argv[4], "from"))
      return CLI_SHOWUSAGE;

   if (ast_context_remove_ignorepat(a->argv[5], a->argv[3], registrar)) {
      switch (errno) {
      case EBUSY:
         ast_cli(a->fd, "Failed to lock context(s) list, please try again later\n");
         break;

      case ENOENT:
         ast_cli(a->fd, "There is no existence of '%s' context\n", a->argv[5]);
         break;

      case EINVAL:
         ast_cli(a->fd, "There is no existence of '%s' ignore pattern in '%s' context\n",
               a->argv[3], a->argv[5]);
         break;

      default:
         ast_cli(a->fd, "Failed to remove ignore pattern '%s' from '%s' context\n",
               a->argv[3], a->argv[5]);
         break;
      }
      return CLI_FAILURE;
   }

   ast_cli(a->fd, "Ignore pattern '%s' removed from '%s' context\n",
      a->argv[3], a->argv[5]);
   return CLI_SUCCESS;
}

static char *complete_dialplan_remove_ignorepat(struct ast_cli_args *a)
{
   struct ast_context *c;
   int which = 0;
   char *ret = NULL;

   if (a->pos == 3) {
      int len = strlen(a->word);
      if (ast_rdlock_contexts()) {
         ast_log(LOG_WARNING, "Failed to lock contexts list\n");
         return NULL;
      }

      for (c = NULL; !ret && (c = ast_walk_contexts(c));) {
         struct ast_ignorepat *ip;

         if (ast_rdlock_context(c)) /* error, skip it */
            continue;
         
         for (ip = NULL; !ret && (ip = ast_walk_context_ignorepats(c, ip));) {
            if (partial_match(ast_get_ignorepat_name(ip), a->word, len) && ++which > a->n) {
               /* n-th match */
               struct ast_context *cw = NULL;
               int found = 0;
               while ( (cw = ast_walk_contexts(cw)) && cw != c && !found) {
                  /* XXX do i stop on c, or skip it ? */
                  found = lookup_c_ip(cw, ast_get_ignorepat_name(ip));
               }
               if (!found)
                  ret = strdup(ast_get_ignorepat_name(ip));
            }
         }
         ast_unlock_context(c);
      }
      ast_unlock_contexts();
      return ret;
   } else if (a->pos == 4) {
       return a->n == 0 ? strdup("from") : NULL;
   } else if (a->pos == 5) { /* XXX check this */
      char *dupline, *duplinet, *ignorepat;
      int len = strlen(a->word);

      dupline = strdup(a->line);
      if (!dupline) {
         ast_log(LOG_WARNING, "Out of free memory\n");
         return NULL;
      }

      duplinet = dupline;
      strsep(&duplinet, " ");
      strsep(&duplinet, " ");
      ignorepat = strsep(&duplinet, " ");

      if (!ignorepat) {
         free(dupline);
         return NULL;
      }

      if (ast_rdlock_contexts()) {
         ast_log(LOG_WARNING, "Failed to lock contexts list\n");
         free(dupline);
         return NULL;
      }

      for (c = NULL; !ret && (c = ast_walk_contexts(c)); ) {
         if (ast_rdlock_context(c)) /* fail, skip it */
            continue;
         if (!partial_match(ast_get_context_name(c), a->word, len))
            continue;
         if (lookup_c_ip(c, ignorepat) && ++which > a->n)
            ret = strdup(ast_get_context_name(c));
         ast_unlock_context(c);
      }
      ast_unlock_contexts();
      free(dupline);
      return NULL;
   }

   return NULL;
}

static int pbx_load_module(void);

static char *handle_cli_dialplan_reload(struct ast_cli_entry *e, int cmd, struct ast_cli_args *a)
{
   switch (cmd) {
   case CLI_INIT:
      e->command = "dialplan reload";
      e->usage =
         "Usage: dialplan reload\n"
         "       Reload extensions.conf without reloading any other\n"
         "       modules.  This command does not delete global variables\n"
         "       unless clearglobalvars is set to yes in extensions.conf\n";
      return NULL;
   case CLI_GENERATE:
      return NULL;
   }

   if (a->argc != 2)
      return CLI_SHOWUSAGE;

   if (clearglobalvars_config)
      pbx_builtin_clear_globals();

   pbx_load_module();
   ast_cli(a->fd, "Dialplan reloaded.\n");
   return CLI_SUCCESS;
}

/*!
 * CLI entries for commands provided by this module
 */
static struct ast_cli_entry cli_pbx_config[] = {
   AST_CLI_DEFINE(handle_cli_dialplan_add_extension,    "Add new extension into context"),
   AST_CLI_DEFINE(handle_cli_dialplan_remove_extension, "Remove a specified extension"),
   AST_CLI_DEFINE(handle_cli_dialplan_add_ignorepat,    "Add new ignore pattern"),
   AST_CLI_DEFINE(handle_cli_dialplan_remove_ignorepat, "Remove ignore pattern from context"),
   AST_CLI_DEFINE(handle_cli_dialplan_add_include,      "Include context in other context"),
   AST_CLI_DEFINE(handle_cli_dialplan_remove_include,   "Remove a specified include from context"),
   AST_CLI_DEFINE(handle_cli_dialplan_reload,           "Reload extensions and *only* extensions"),
   AST_CLI_DEFINE(handle_cli_dialplan_save,             "Save current dialplan into a file")
};

static struct ast_cli_entry cli_dialplan_save =
   AST_CLI_DEFINE(handle_cli_dialplan_save, "Save dialplan");

/*!
 * Standard module functions ...
 */
static int unload_module(void)
{
   if (static_config && !write_protect_config)
      ast_cli_unregister(&cli_dialplan_save);
   if (overrideswitch_config) {
      ast_free(overrideswitch_config);
   }
   ast_cli_unregister_multiple(cli_pbx_config, ARRAY_LEN(cli_pbx_config));
   ast_context_destroy(NULL, registrar);
   return 0;
}

/*!\note Protect against misparsing based upon commas in the middle of fields
 * like character classes.  We've taken steps to permit pretty much every other
 * printable character in a character class, so properly handling a comma at
 * this level is a natural extension.  This is almost like the standard
 * application parser in app.c, except that it handles square brackets. */
static char *pbx_strsep(char **destructible, const char *delim)
{
   int square = 0;
   char *res = *destructible;
   for (; destructible && *destructible && **destructible; (*destructible)++) {
      if (**destructible == '[' && !strchr(delim, '[')) {
         square++;
      } else if (**destructible == ']' && !strchr(delim, ']')) {
         if (square) {
            square--;
         }
      } else if (**destructible == '\\' && !strchr(delim, '\\')) {
         (*destructible)++;
      } else if (strchr(delim, **destructible) && !square) {
         **destructible = '\0';
         (*destructible)++;
         break;
      }
   }
   if (destructible && *destructible && **destructible == '\0') {
      *destructible = NULL;
   }
   return res;
}

static int pbx_load_config(const char *config_file)
{
   struct ast_config *cfg;
   char *end;
   char *label;
#ifdef LOW_MEMORY
   char realvalue[256];
#else
   char realvalue[8192];
#endif
   int lastpri = -2;
   struct ast_context *con;
   struct ast_variable *v;
   const char *cxt;
   const char *aft;
   const char *newpm, *ovsw;
   struct ast_flags config_flags = { 0 };
   char lastextension[256];
   cfg = ast_config_load(config_file, config_flags);
   if (!cfg || cfg == CONFIG_STATUS_FILEINVALID)
      return 0;

   /* Use existing config to populate the PBX table */
   static_config = ast_true(ast_variable_retrieve(cfg, "general", "static"));
   write_protect_config = ast_true(ast_variable_retrieve(cfg, "general", "writeprotect"));
   if ((aft = ast_variable_retrieve(cfg, "general", "autofallthrough")))
      autofallthrough_config = ast_true(aft);
   if ((newpm = ast_variable_retrieve(cfg, "general", "extenpatternmatchnew")))
      extenpatternmatchnew_config = ast_true(newpm);
   clearglobalvars_config = ast_true(ast_variable_retrieve(cfg, "general", "clearglobalvars"));
   if ((ovsw = ast_variable_retrieve(cfg, "general", "overrideswitch"))) {
      if (overrideswitch_config) {
         ast_free(overrideswitch_config);
      }
      if (!ast_strlen_zero(ovsw)) {
         overrideswitch_config = ast_strdup(ovsw);
      } else {
         overrideswitch_config = NULL;
      }
   }

   ast_copy_string(userscontext, ast_variable_retrieve(cfg, "general", "userscontext") ?: "default", sizeof(userscontext));
                            
   for (v = ast_variable_browse(cfg, "globals"); v; v = v->next) {
      pbx_substitute_variables_helper(NULL, v->value, realvalue, sizeof(realvalue) - 1);
      pbx_builtin_setvar_helper(NULL, v->name, realvalue);
   }
   for (cxt = ast_category_browse(cfg, NULL);
        cxt;
        cxt = ast_category_browse(cfg, cxt)) {
      /* All categories but "general" or "globals" are considered contexts */
      if (!strcasecmp(cxt, "general") || !strcasecmp(cxt, "globals")) {
         continue;
      }
      if (!(con = ast_context_find_or_create(&local_contexts, local_table, cxt, registrar))) {
         continue;
      }

      /* Reset continuation items at the beginning of each context */
      lastextension[0] = '\0';
      lastpri = -2;

      for (v = ast_variable_browse(cfg, cxt); v; v = v->next) {
         char *tc = NULL;
         char realext[256] = "";
         char *stringp, *ext;
         const char *vfile;

         /* get filename for error reporting from top level or an #include */
         vfile = !*v->file ? config_file : v->file;

         if (!strncasecmp(v->name, "same", 4)) {
            if (ast_strlen_zero(lastextension)) {
               ast_log(LOG_ERROR,
                  "No previous pattern in the first entry of context '%s' to match '%s' at line %d of %s!\n",
                  cxt, v->name, v->lineno, vfile);
               continue;
            }
            if ((stringp = tc = ast_strdup(v->value))) {
               ast_copy_string(realext, lastextension, sizeof(realext));
               goto process_extension;
            }
         } else if (!strcasecmp(v->name, "exten")) {
            int ipri;
            char *plus, *firstp;
            char *pri, *appl, *data, *cidmatch;

            if (!(stringp = tc = ast_strdup(v->value))) {
               continue;
            }

            ext = S_OR(pbx_strsep(&stringp, ","), "");
            pbx_substitute_variables_helper(NULL, ext, realext, sizeof(realext) - 1);
            ast_copy_string(lastextension, realext, sizeof(lastextension));
process_extension:
            ipri = -2;
            if ((cidmatch = strchr(realext, '/'))) {
               *cidmatch++ = '\0';
               ast_shrink_phone_number(cidmatch);
            }
            pri = ast_strip(S_OR(strsep(&stringp, ","), ""));
            if ((label = strchr(pri, '('))) {
               *label++ = '\0';
               if ((end = strchr(label, ')'))) {
                  *end = '\0';
               } else {
                  ast_log(LOG_WARNING,
                     "Label missing trailing ')' at line %d of %s\n",
                     v->lineno, vfile);
                  ast_free(tc);
                  continue;
               }
            }
            if ((plus = strchr(pri, '+'))) {
               *plus++ = '\0';
            }
            if (!strcmp(pri,"hint")) {
               ipri = PRIORITY_HINT;
            } else if (!strcmp(pri, "next") || !strcmp(pri, "n")) {
               if (lastpri > -2) {
                  ipri = lastpri + 1;
               } else {
                  ast_log(LOG_WARNING,
                     "Can't use 'next' priority on the first entry at line %d of %s!\n",
                     v->lineno, vfile);
                  ast_free(tc);
                  continue;
               }
            } else if (!strcmp(pri, "same") || !strcmp(pri, "s")) {
               if (lastpri > -2) {
                  ipri = lastpri;
               } else {
                  ast_log(LOG_WARNING,
                     "Can't use 'same' priority on the first entry at line %d of %s!\n",
                     v->lineno, vfile);
                  ast_free(tc);
                  continue;
               }
            } else if (sscanf(pri, "%30d", &ipri) != 1 &&
                  (ipri = ast_findlabel_extension2(NULL, con, realext, pri, cidmatch)) < 1) {
               ast_log(LOG_WARNING,
                  "Invalid priority/label '%s' at line %d of %s\n",
                  pri, v->lineno, vfile);
               ipri = 0;
               ast_free(tc);
               continue;
            } else if (ipri < 1) {
               ast_log(LOG_WARNING, "Invalid priority '%s' at line %d of %s\n",
                  pri, v->lineno, vfile);
               ast_free(tc);
               continue;
            }
            appl = S_OR(stringp, "");
            /* Find the first occurrence of '(' */
            if (!(firstp = strchr(appl, '('))) {
               /* No arguments */
               data = "";
            } else {
               char *orig_appl = ast_strdup(appl);

               if (!orig_appl) {
                  ast_free(tc);
                  continue;
               }

               appl = strsep(&stringp, "(");

               /* check if there are variables or expressions without an application, like: exten => 100,hint,DAHDI/g0/${GLOBAL(var)}  */
               if (strstr(appl, "${") || strstr(appl, "$[")){
                  /* set appl to original one */
                  strcpy(appl, orig_appl);
                  /* set no data */
                  data = "";
               /* no variable before application found -> go ahead */
               } else {
                  data = S_OR(stringp, "");
                  if ((end = strrchr(data, ')'))) {
                     *end = '\0';
                  } else {
                     ast_log(LOG_WARNING,
                        "No closing parenthesis found? '%s(%s' at line %d of %s\n",
                        appl, data, v->lineno, vfile);
                  }
               }
               ast_free(orig_appl);
            }

            appl = ast_skip_blanks(appl);
            if (ipri) {
               if (plus) {
                  ipri += atoi(plus);
               }
               lastpri = ipri;
               if (!ast_opt_dont_warn && (!strcmp(realext, "_.") || !strcmp(realext, "_!"))) {
                  ast_log(LOG_WARNING,
                     "The use of '%s' for an extension is strongly discouraged and can have unexpected behavior.  Please use '_X%c' instead at line %d of %s\n",
                     realext, realext[1], v->lineno, vfile);
               }
               if (ast_add_extension2(con, 0, realext, ipri, label, cidmatch, appl, ast_strdup(data), ast_free_ptr, registrar)) {
                  ast_log(LOG_WARNING,
                     "Unable to register extension at line %d of %s\n",
                     v->lineno, vfile);
               }
            }
            free(tc);
         } else if (!strcasecmp(v->name, "include")) {
            pbx_substitute_variables_helper(NULL, v->value, realvalue, sizeof(realvalue) - 1);
            if (ast_context_add_include2(con, realvalue, registrar)) {
               switch (errno) {
               case ENOMEM:
                  ast_log(LOG_WARNING, "Out of memory for context addition\n");
                  break;

               case EBUSY:
                  ast_log(LOG_WARNING, "Failed to lock context(s) list, please try again later\n");
                  break;

               case EEXIST:
                  ast_log(LOG_WARNING,
                     "Context '%s' already included in '%s' context on include at line %d of %s\n",
                     v->value, cxt, v->lineno, vfile);
                  break;

               case ENOENT:
               case EINVAL:
                  ast_log(LOG_WARNING,
                     "There is no existence of context '%s' included at line %d of %s\n",
                     errno == ENOENT ? v->value : cxt, v->lineno, vfile);
                  break;

               default:
                  ast_log(LOG_WARNING,
                     "Failed to include '%s' in '%s' context at line %d of %s\n",
                     v->value, cxt, v->lineno, vfile);
                  break;
               }
            }
         } else if (!strcasecmp(v->name, "ignorepat")) {
            pbx_substitute_variables_helper(NULL, v->value, realvalue, sizeof(realvalue) - 1);
            if (ast_context_add_ignorepat2(con, realvalue, registrar)) {
               ast_log(LOG_WARNING,
                  "Unable to include ignorepat '%s' in context '%s' at line %d of %s\n",
                  v->value, cxt, v->lineno, vfile);
            }
         } else if (!strcasecmp(v->name, "switch") || !strcasecmp(v->name, "lswitch") || !strcasecmp(v->name, "eswitch")) {
            char *stringp = realvalue;
            char *appl, *data;
            
            if (!strcasecmp(v->name, "switch")) {
               pbx_substitute_variables_helper(NULL, v->value, realvalue, sizeof(realvalue) - 1);
            } else {
               ast_copy_string(realvalue, v->value, sizeof(realvalue));
            }
            appl = strsep(&stringp, "/");
            data = S_OR(stringp, "");
            if (ast_context_add_switch2(con, appl, data, !strcasecmp(v->name, "eswitch"), registrar)) {
               ast_log(LOG_WARNING,
                  "Unable to include switch '%s' in context '%s' at line %d of %s\n",
                  v->value, cxt, v->lineno, vfile);
            }
         } else {
            ast_log(LOG_WARNING,
               "==!!== Unknown directive: %s at line %d of %s -- IGNORING!!!\n",
               v->name, v->lineno, vfile);
         }
      }
   }
   ast_config_destroy(cfg);
   return 1;
}

static void append_interface(char *iface, int maxlen, char *add)
{
   int len = strlen(iface);
   if (strlen(add) + len < maxlen - 2) {
      if (strlen(iface)) {
         iface[len] = '&';
         strcpy(iface + len + 1, add);
      } else
         strcpy(iface, add);
   }
}

static void pbx_load_users(void)
{
   struct ast_config *cfg;
   char *cat, *chan;
   const char *dahdichan;
   const char *hasexten, *altexts;
   char tmp[256];
   char iface[256];
   char dahdicopy[256];
   char *ext, altcopy[256];
   char *c;
   int hasvoicemail;
   int start, finish, x;
   struct ast_context *con = NULL;
   struct ast_flags config_flags = { 0 };
   
   cfg = ast_config_load("users.conf", config_flags);
   if (!cfg)
      return;

   for (cat = ast_category_browse(cfg, NULL); cat ; cat = ast_category_browse(cfg, cat)) {
      if (!strcasecmp(cat, "general"))
         continue;
      iface[0] = '\0';
      if (ast_true(ast_config_option(cfg, cat, "hassip"))) {
         snprintf(tmp, sizeof(tmp), "SIP/%s", cat);
         append_interface(iface, sizeof(iface), tmp);
      }
      if (ast_true(ast_config_option(cfg, cat, "hasiax"))) {
         snprintf(tmp, sizeof(tmp), "IAX2/%s", cat);
         append_interface(iface, sizeof(iface), tmp);
      }
      if (ast_true(ast_config_option(cfg, cat, "hash323"))) {
         snprintf(tmp, sizeof(tmp), "H323/%s", cat);
         append_interface(iface, sizeof(iface), tmp);
      }
      hasexten = ast_config_option(cfg, cat, "hasexten");
      if (hasexten && !ast_true(hasexten))
         continue;
      hasvoicemail = ast_true(ast_config_option(cfg, cat, "hasvoicemail"));
      dahdichan = ast_variable_retrieve(cfg, cat, "dahdichan");
      if (!dahdichan)
         dahdichan = ast_variable_retrieve(cfg, "general", "dahdichan");
      if (!ast_strlen_zero(dahdichan)) {
         ast_copy_string(dahdicopy, dahdichan, sizeof(dahdicopy));
         c = dahdicopy;
         chan = strsep(&c, ",");
         while (chan) {
            if (sscanf(chan, "%30d-%30d", &start, &finish) == 2) {
               /* Range */
            } else if (sscanf(chan, "%30d", &start)) {
               /* Just one */
               finish = start;
            } else {
               start = 0; finish = 0;
            }
            if (finish < start) {
               x = finish;
               finish = start;
               start = x;
            }
            for (x = start; x <= finish; x++) {
               snprintf(tmp, sizeof(tmp), "DAHDI/%d", x);
               append_interface(iface, sizeof(iface), tmp);
            }
            chan = strsep(&c, ",");
         }
      }
      if (!ast_strlen_zero(iface)) {
         /* Only create a context here when it is really needed. Otherwise default empty context
         created by pbx_config may conflict with the one explicitly created by pbx_ael */
         if (!con)
            con = ast_context_find_or_create(&local_contexts, local_table, userscontext, registrar);

         if (!con) {
            ast_log(LOG_ERROR, "Can't find/create user context '%s'\n", userscontext);
            return;
         }

         /* Add hint */
         ast_add_extension2(con, 0, cat, -1, NULL, NULL, iface, NULL, NULL, registrar);
         /* If voicemail, use "stdexten" else use plain old dial */
         if (hasvoicemail) {
            snprintf(tmp, sizeof(tmp), "%s,stdexten(${HINT})", cat);
            ast_add_extension2(con, 0, cat, 1, NULL, NULL, "Gosub", ast_strdup(tmp), ast_free_ptr, registrar);
         } else {
            ast_add_extension2(con, 0, cat, 1, NULL, NULL, "Dial", ast_strdup("${HINT}"), ast_free_ptr, registrar);
         }
         altexts = ast_variable_retrieve(cfg, cat, "alternateexts");
         if (!ast_strlen_zero(altexts)) {
            snprintf(tmp, sizeof(tmp), "%s,1", cat);
            ast_copy_string(altcopy, altexts, sizeof(altcopy));
            c = altcopy;
            ext = strsep(&c, ",");
            while (ext) {
               ast_add_extension2(con, 0, ext, 1, NULL, NULL, "Goto", ast_strdup(tmp), ast_free_ptr, registrar);
               ext = strsep(&c, ",");
            }
         }
      }
   }
   ast_config_destroy(cfg);
}

static int pbx_load_module(void)
{
   struct ast_context *con;

   if (!local_table)
      local_table = ast_hashtab_create(17, ast_hashtab_compare_contexts, ast_hashtab_resize_java, ast_hashtab_newsize_java, ast_hashtab_hash_contexts, 0);

   if (!pbx_load_config(config))
      return AST_MODULE_LOAD_DECLINE;
   
   pbx_load_users();

   ast_merge_contexts_and_delete(&local_contexts, local_table, registrar);
   local_table = NULL; /* the local table has been moved into the global one. */
   local_contexts = NULL;

   for (con = NULL; (con = ast_walk_contexts(con));)
      ast_context_verify_includes(con);

   pbx_set_overrideswitch(overrideswitch_config);
   pbx_set_autofallthrough(autofallthrough_config);
   pbx_set_extenpatternmatchnew(extenpatternmatchnew_config);

   return AST_MODULE_LOAD_SUCCESS;
}

static int load_module(void)
{
   if (static_config && !write_protect_config)
      ast_cli_register(&cli_dialplan_save);
   ast_cli_register_multiple(cli_pbx_config, ARRAY_LEN(cli_pbx_config));

   if (pbx_load_module())
      return AST_MODULE_LOAD_DECLINE;

   return AST_MODULE_LOAD_SUCCESS;
}

static int reload(void)
{
   if (clearglobalvars_config)
      pbx_builtin_clear_globals();
   return pbx_load_module();
}

AST_MODULE_INFO(ASTERISK_GPL_KEY, AST_MODFLAG_DEFAULT, "Text Extension Configuration",
      .load = load_module,
      .unload = unload_module,
      .reload = reload,
          );