indications.c

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/*
 * Asterisk -- An open source telephony toolkit.
 *
 * Copyright (C) 2002, Pauline Middelink
 * Copyright (C) 2009, Digium, Inc.
 *
 * 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 Indication Tone Handling
 *
 * \author Pauline Middelink <[email protected]>
 * \author Russell Bryant <[email protected]>
 */

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

#include "asterisk.h"

#include <math.h>

#include "asterisk/lock.h"
#include "asterisk/linkedlists.h"
#include "asterisk/indications.h"
#include "asterisk/frame.h"
#include "asterisk/format_cache.h"
#include "asterisk/channel.h"
#include "asterisk/utils.h"
#include "asterisk/cli.h"
#include "asterisk/module.h"
#include "asterisk/astobj2.h"

#include "asterisk/_private.h" /* _init(), _reload() */

/* Globals */
static const char config[] = "indications.conf";

static const int midi_tohz[128] = {
   8,     8,     9,     9,     10,    10,    11,    12,    12,    13,
   14,    15,    16,    17,    18,    19,    20,    21,    23,    24,
   25,    27,    29,    30,    32,    34,    36,    38,    41,    43,
   46,    48,    51,    55,    58,    61,    65,    69,    73,    77,
   82,    87,    92,    97,    103,   110,   116,   123,   130,   138,
   146,   155,   164,   174,   184,   195,   207,   220,   233,   246,
   261,   277,   293,   311,   329,   349,   369,   391,   415,   440,
   466,   493,   523,   554,   587,   622,   659,   698,   739,   783,
   830,   880,   932,   987,   1046,  1108,  1174,  1244,  1318,  1396,
   1479,  1567,  1661,  1760,  1864,  1975,  2093,  2217,  2349,  2489,
   2637,  2793,  2959,  3135,  3322,  3520,  3729,  3951,  4186,  4434,
   4698,  4978,  5274,  5587,  5919,  6271,  6644,  7040,  7458,  7902,
   8372,  8869,  9397,  9956,  10548, 11175, 11839, 12543
};

static struct ao2_container *ast_tone_zones;

#define NUM_TONE_ZONE_BUCKETS 53

/*!
 * \note Access to this is protected by locking the ast_tone_zones container
 */
static struct ast_tone_zone *default_tone_zone;

struct playtones_item {
   int fac1;
   int init_v2_1;
   int init_v3_1;
   int fac2;
   int init_v2_2;
   int init_v3_2;
   int modulate;
   int duration;
};

struct playtones_def {
   int vol;
   int reppos;
   int nitems;
   int interruptible;
   struct playtones_item *items;
};

struct playtones_state {
   int vol;
   int v1_1;
   int v2_1;
   int v3_1;
   int v1_2;
   int v2_2;
   int v3_2;
   int reppos;
   int nitems;
   struct playtones_item *items;
   int npos;
   int oldnpos;
   int pos;
   struct ast_format *origwfmt;
   struct ast_frame f;
   unsigned char offset[AST_FRIENDLY_OFFSET];
   short data[4000];
};

static void playtones_release(struct ast_channel *chan, void *params)
{
   struct playtones_state *ps = params;

   if (chan) {
      ast_set_write_format(chan, ps->origwfmt);
   }

   ao2_cleanup(ps->origwfmt);
   ast_free(ps->items);

   ast_free(ps);
}

static void *playtones_alloc(struct ast_channel *chan, void *params)
{
   struct playtones_def *pd = params;
   struct playtones_state *ps = NULL;

   if (!(ps = ast_calloc(1, sizeof(*ps)))) {
      return NULL;
   }

   ps->origwfmt = ao2_bump(ast_channel_writeformat(chan));

   if (ast_set_write_format(chan, ast_format_slin)) {
      ast_log(LOG_WARNING, "Unable to set '%s' to signed linear format (write)\n", ast_channel_name(chan));
      playtones_release(NULL, ps);
      ps = NULL;
   } else {
      ps->vol = pd->vol;
      ps->reppos = pd->reppos;
      ps->nitems = pd->nitems;
      ps->items = pd->items;
      ps->oldnpos = -1;
   }

   /* Let interrupts interrupt :) */
   if (pd->interruptible) {
      ast_set_flag(ast_channel_flags(chan), AST_FLAG_WRITE_INT);
   } else {
      ast_clear_flag(ast_channel_flags(chan), AST_FLAG_WRITE_INT);
   }

   return ps;
}

static int playtones_generator(struct ast_channel *chan, void *data, int len, int samples)
{
   struct playtones_state *ps = data;
   struct playtones_item *pi;
   int x;

   /* we need to prepare a frame with 16 * timelen samples as we're
    * generating SLIN audio */

   len = samples * 2;
   if (len > sizeof(ps->data) / 2 - 1) {
      ast_log(LOG_WARNING, "Can't generate that much data!\n");
      return -1;
   }

   memset(&ps->f, 0, sizeof(ps->f));

   pi = &ps->items[ps->npos];

   if (ps->oldnpos != ps->npos) {
      /* Load new parameters */
      ps->v1_1 = 0;
      ps->v2_1 = pi->init_v2_1;
      ps->v3_1 = pi->init_v3_1;
      ps->v1_2 = 0;
      ps->v2_2 = pi->init_v2_2;
      ps->v3_2 = pi->init_v3_2;
      ps->oldnpos = ps->npos;
   }

   for (x = 0; x < samples; x++) {
      ps->v1_1 = ps->v2_1;
      ps->v2_1 = ps->v3_1;
      ps->v3_1 = (pi->fac1 * ps->v2_1 >> 15) - ps->v1_1;

      ps->v1_2 = ps->v2_2;
      ps->v2_2 = ps->v3_2;
      ps->v3_2 = (pi->fac2 * ps->v2_2 >> 15) - ps->v1_2;
      if (pi->modulate) {
         int p;
         p = ps->v3_2 - 32768;
         if (p < 0) {
            p = -p;
         }
         p = ((p * 9) / 10) + 1;
         ps->data[x] = (ps->v3_1 * p) >> 15;
      } else {
         ps->data[x] = ps->v3_1 + ps->v3_2;
      }
   }

   ps->f.frametype = AST_FRAME_VOICE;
   ps->f.subclass.format = ast_format_slin;
   ps->f.datalen = len;
   ps->f.samples = samples;
   ps->f.offset = AST_FRIENDLY_OFFSET;
   ps->f.data.ptr = ps->data;

   if (ast_write(chan, &ps->f)) {
      return -1;
   }

   ps->pos += x;

   if (pi->duration && ps->pos >= pi->duration * 8) { /* item finished? */
      ps->pos = 0;               /* start new item */
      ps->npos++;
      if (ps->npos >= ps->nitems) {       /* last item? */
         if (ps->reppos == -1) {       /* repeat set? */
            return -1;
         }
         ps->npos = ps->reppos;        /* redo from top */
      }
   }

   return 0;
}

static struct ast_generator playtones = {
   .alloc     = playtones_alloc,
   .release   = playtones_release,
   .generate  = playtones_generator,
};

int ast_tone_zone_part_parse(const char *s, struct ast_tone_zone_part *tone_data)
{
   if (sscanf(s, "%30u+%30u/%30u", &tone_data->freq1, &tone_data->freq2,
         &tone_data->time) == 3) {
      /* f1+f2/time format */
   } else if (sscanf(s, "%30u+%30u", &tone_data->freq1, &tone_data->freq2) == 2) {
      /* f1+f2 format */
      tone_data->time = 0;
   } else if (sscanf(s, "%30u*%30u/%30u", &tone_data->freq1, &tone_data->freq2,
         &tone_data->time) == 3) {
      /* f1*f2/time format */
      tone_data->modulate = 1;
   } else if (sscanf(s, "%30u*%30u", &tone_data->freq1, &tone_data->freq2) == 2) {
      /* f1*f2 format */
      tone_data->time = 0;
      tone_data->modulate = 1;
   } else if (sscanf(s, "%30u/%30u", &tone_data->freq1, &tone_data->time) == 2) {
      /* f1/time format */
      tone_data->freq2 = 0;
   } else if (sscanf(s, "%30u", &tone_data->freq1) == 1) {
      /* f1 format */
      tone_data->freq2 = 0;
      tone_data->time = 0;
   } else if (sscanf(s, "M%30u+M%30u/%30u", &tone_data->freq1, &tone_data->freq2,
         &tone_data->time) == 3) {
      /* Mf1+Mf2/time format */
      tone_data->midinote = 1;
   } else if (sscanf(s, "M%30u+M%30u", &tone_data->freq1, &tone_data->freq2) == 2) {
      /* Mf1+Mf2 format */
      tone_data->time = 0;
      tone_data->midinote = 1;
   } else if (sscanf(s, "M%30u*M%30u/%30u", &tone_data->freq1, &tone_data->freq2,
         &tone_data->time) == 3) {
      /* Mf1*Mf2/time format */
      tone_data->modulate = 1;
      tone_data->midinote = 1;
   } else if (sscanf(s, "M%30u*M%30u", &tone_data->freq1, &tone_data->freq2) == 2) {
      /* Mf1*Mf2 format */
      tone_data->time = 0;
      tone_data->modulate = 1;
      tone_data->midinote = 1;
   } else if (sscanf(s, "M%30u/%30u", &tone_data->freq1, &tone_data->time) == 2) {
      /* Mf1/time format */
      tone_data->freq2 = -1;
      tone_data->midinote = 1;
   } else if (sscanf(s, "M%30u", &tone_data->freq1) == 1) {
      /* Mf1 format */
      tone_data->freq2 = -1;
      tone_data->time = 0;
      tone_data->midinote = 1;
   } else {
      return -1;
   }

   return 0;
}

int ast_playtones_start(struct ast_channel *chan, int vol, const char *playlst, int interruptible)
{
   char *s, *data = ast_strdupa(playlst);
   struct playtones_def d = { vol, -1, 0, 1, NULL };
   char *stringp;
   char *separator;
   static const float sample_rate = 8000.0;
   static const float max_sample_val = 32768.0;

   if (vol < 1) {
      d.vol = 7219; /* Default to -8db */
   }

   d.interruptible = interruptible;

   stringp = data;

   /* check if the data is separated with '|' or with ',' by default */
   if (strchr(stringp,'|')) {
      separator = "|";
   } else {
      separator = ",";
   }

   while ((s = strsep(&stringp, separator)) && !ast_strlen_zero(s)) {
      struct playtones_item *new_items;
      struct ast_tone_zone_part tone_data = {
         .time = 0,
      };

      s = ast_strip(s);
      if (s[0]=='!') {
         s++;
      } else if (d.reppos == -1) {
         d.reppos = d.nitems;
      }

      if (ast_tone_zone_part_parse(s, &tone_data)) {
         ast_log(LOG_ERROR, "Failed to parse tone part '%s'\n", s);
         continue;
      }

      if (tone_data.midinote) {
         /* midi notes must be between 0 and 127 */
         if (tone_data.freq1 <= 127) {
            tone_data.freq1 = midi_tohz[tone_data.freq1];
         } else {
            tone_data.freq1 = 0;
         }

         if (tone_data.freq2 <= 127) {
            tone_data.freq2 = midi_tohz[tone_data.freq2];
         } else {
            tone_data.freq2 = 0;
         }
      }

      new_items = ast_realloc(d.items, (d.nitems + 1) * sizeof(*d.items));
      if (!new_items) {
         ast_free(d.items);
         return -1;
      }
      d.items = new_items;

      d.items[d.nitems].fac1 = 2.0 * cos(2.0 * M_PI * (tone_data.freq1 / sample_rate)) * max_sample_val;
      d.items[d.nitems].init_v2_1 = sin(-4.0 * M_PI * (tone_data.freq1 / sample_rate)) * d.vol;
      d.items[d.nitems].init_v3_1 = sin(-2.0 * M_PI * (tone_data.freq1 / sample_rate)) * d.vol;

      d.items[d.nitems].fac2 = 2.0 * cos(2.0 * M_PI * (tone_data.freq2 / sample_rate)) * max_sample_val;
      d.items[d.nitems].init_v2_2 = sin(-4.0 * M_PI * (tone_data.freq2 / sample_rate)) * d.vol;
      d.items[d.nitems].init_v3_2 = sin(-2.0 * M_PI * (tone_data.freq2 / sample_rate)) * d.vol;

      d.items[d.nitems].duration = tone_data.time;
      d.items[d.nitems].modulate = tone_data.modulate;

      d.nitems++;
   }

   if (!d.nitems) {
      ast_log(LOG_ERROR, "No valid tone parts\n");
      return -1;
   }

   if (ast_activate_generator(chan, &playtones, &d)) {
      ast_free(d.items);
      return -1;
   }

   return 0;
}

void ast_playtones_stop(struct ast_channel *chan)
{
   ast_deactivate_generator(chan);
}

int ast_tone_zone_count(void)
{
   return ao2_container_count(ast_tone_zones);
}

struct ao2_iterator ast_tone_zone_iterator_init(void)
{
   return ao2_iterator_init(ast_tone_zones, 0);
}

/*! \brief Set global indication country
   If no country is specified or we are unable to find the zone, then return not found */
static int ast_set_indication_country(const char *country)
{
   struct ast_tone_zone *zone = NULL;

   if (ast_strlen_zero(country) || !(zone = ast_get_indication_zone(country))) {
      return -1;
   }

   ast_verb(3, "Setting default indication country to '%s'\n", country);

   ao2_lock(ast_tone_zones);
   if (default_tone_zone) {
      default_tone_zone = ast_tone_zone_unref(default_tone_zone);
   }
   default_tone_zone = ast_tone_zone_ref(zone);
   ao2_unlock(ast_tone_zones);

   zone = ast_tone_zone_unref(zone);

   return 0;
}

/*! \brief locate ast_tone_zone, given the country. if country == NULL, use the default country */
struct ast_tone_zone *ast_get_indication_zone(const char *country)
{
   struct ast_tone_zone *tz = NULL;
   struct ast_tone_zone zone_arg = {
      .nrringcadence = 0,
   };

   if (ast_strlen_zero(country)) {
      ao2_lock(ast_tone_zones);
      if (default_tone_zone) {
         tz = ast_tone_zone_ref(default_tone_zone);
      }
      ao2_unlock(ast_tone_zones);

      return tz;
   }

   ast_copy_string(zone_arg.country, country, sizeof(zone_arg.country));

   return ao2_find(ast_tone_zones, &zone_arg, OBJ_POINTER);
}

struct ast_tone_zone_sound *ast_get_indication_tone(const struct ast_tone_zone *_zone, const char *indication)
{
   struct ast_tone_zone_sound *ts = NULL;
   /* _zone is const to the users of the API */
   struct ast_tone_zone *zone = (struct ast_tone_zone *) _zone;

   /* If no zone is specified, use the default */
   if (!zone) {
      ao2_lock(ast_tone_zones);
      if (default_tone_zone) {
         zone = ast_tone_zone_ref(default_tone_zone);
      }
      ao2_unlock(ast_tone_zones);

      if (!zone) {
         return NULL;
      }
   }

   ast_tone_zone_lock(zone);

   /* Look through list of tones in the zone searching for the right one */
   AST_LIST_TRAVERSE(&zone->tones, ts, entry) {
      if (!strcasecmp(ts->name, indication)) {
         /* Increase ref count for the reference we will return */
         ts = ast_tone_zone_sound_ref(ts);
         break;
      }
   }

   ast_tone_zone_unlock(zone);

   if (!_zone)
      zone = ast_tone_zone_unref(zone);

   return ts;
}

static void ast_tone_zone_sound_destructor(void *obj)
{
   struct ast_tone_zone_sound *ts = obj;

   /* Deconstify the 'const char *'s so the compiler doesn't complain. (but it's safe) */
   if (ts->name) {
      ast_free((char *) ts->name);
      ts->name = NULL;
   }

   if (ts->data) {
      ast_free((char *) ts->data);
      ts->data = NULL;
   }
}

/*! \brief deallocate the passed tone zone */
static void ast_tone_zone_destructor(void *obj)
{
   struct ast_tone_zone *zone = obj;
   struct ast_tone_zone_sound *current;

   while ((current = AST_LIST_REMOVE_HEAD(&zone->tones, entry))) {
      current = ast_tone_zone_sound_unref(current);
   }

   if (zone->ringcadence) {
      ast_free(zone->ringcadence);
      zone->ringcadence = NULL;
   }
}

/*! \brief add a new country, if country exists, it will be replaced. */
static int ast_register_indication_country(struct ast_tone_zone *zone)
{
   ao2_lock(ast_tone_zones);
   if (!default_tone_zone) {
      default_tone_zone = ast_tone_zone_ref(zone);
   }
   ao2_unlock(ast_tone_zones);

   ao2_link(ast_tone_zones, zone);

   ast_verb(3, "Registered indication country '%s'\n", zone->country);

   return 0;
}

/*! \brief remove an existing country and all its indications, country must exist. */
static int ast_unregister_indication_country(const char *country)
{
   struct ast_tone_zone *tz = NULL;
   struct ast_tone_zone zone_arg = {
      .nrringcadence = 0,
   };

   ast_copy_string(zone_arg.country, country, sizeof(zone_arg.country));

   ao2_lock(ast_tone_zones);
   tz = ao2_find(ast_tone_zones, &zone_arg, OBJ_POINTER | OBJ_UNLINK);
   if (!tz) {
      ao2_unlock(ast_tone_zones);
      return -1;
   }

   if (default_tone_zone == tz) {
      ast_tone_zone_unref(default_tone_zone);
      /* Get a new default, punt to the first one we find */
      default_tone_zone = ao2_callback(ast_tone_zones, 0, NULL, NULL);
   }
   ao2_unlock(ast_tone_zones);

   tz = ast_tone_zone_unref(tz);

   return 0;
}

/*!
 * \note called with the tone zone locked
 */
static int ast_register_indication(struct ast_tone_zone *zone, const char *indication,
      const char *tonelist)
{
   struct ast_tone_zone_sound *ts;

   if (ast_strlen_zero(indication) || ast_strlen_zero(tonelist)) {
      return -1;
   }

   AST_LIST_TRAVERSE_SAFE_BEGIN(&zone->tones, ts, entry) {
      if (!strcasecmp(indication, ts->name)) {
         AST_LIST_REMOVE_CURRENT(entry);
         ts = ast_tone_zone_sound_unref(ts);
         break;
      }
   }
   AST_LIST_TRAVERSE_SAFE_END;

   ts = ao2_alloc_options(sizeof(*ts), ast_tone_zone_sound_destructor,
      AO2_ALLOC_OPT_LOCK_NOLOCK);
   if (!ts) {
      return -1;
   }

   if (!(ts->name = ast_strdup(indication)) || !(ts->data = ast_strdup(tonelist))) {
      ts = ast_tone_zone_sound_unref(ts);
      return -1;
   }

   AST_LIST_INSERT_TAIL(&zone->tones, ts, entry); /* Inherit reference */

   return 0;
}

/*! \brief remove an existing country's indication. Both country and indication must exist */
static int ast_unregister_indication(struct ast_tone_zone *zone, const char *indication)
{
   struct ast_tone_zone_sound *ts;
   int res = -1;

   ast_tone_zone_lock(zone);

   AST_LIST_TRAVERSE_SAFE_BEGIN(&zone->tones, ts, entry) {
      if (!strcasecmp(indication, ts->name)) {
         AST_LIST_REMOVE_CURRENT(entry);
         ts = ast_tone_zone_sound_unref(ts);
         res = 0;
         break;
      }
   }
   AST_LIST_TRAVERSE_SAFE_END;

   ast_tone_zone_unlock(zone);

   return res;
}

static struct ast_tone_zone *ast_tone_zone_alloc(void)
{
   return ao2_alloc(sizeof(struct ast_tone_zone), ast_tone_zone_destructor);
}

static char *complete_country(struct ast_cli_args *a)
{
   struct ao2_iterator i;
   size_t wordlen;
   struct ast_tone_zone *tz;

   wordlen = strlen(a->word);

   i = ao2_iterator_init(ast_tone_zones, 0);
   while ((tz = ao2_iterator_next(&i))) {
      if (!strncasecmp(a->word, tz->country, wordlen)) {
         if (ast_cli_completion_add(ast_strdup(tz->country))) {
            ast_tone_zone_unref(tz);
            break;
         }
      }
      ast_tone_zone_unref(tz);
   }
   ao2_iterator_destroy(&i);

   return NULL;
}

static char *handle_cli_indication_add(struct ast_cli_entry *e, int cmd, struct ast_cli_args *a)
{
   struct ast_tone_zone *tz;
   int created_country = 0;
   char *res = CLI_SUCCESS;

   switch (cmd) {
   case CLI_INIT:
      e->command = "indication add";
      e->usage =
         "Usage: indication add <country> <indication> \"<tonelist>\"\n"
         "       Add the given indication to the country.\n";
      return NULL;
   case CLI_GENERATE:
      if (a->pos == 2) {
         return complete_country(a);
      } else {
         return NULL;
      }
   }

   if (a->argc != 5) {
      return CLI_SHOWUSAGE;
   }

   if (!(tz = ast_get_indication_zone(a->argv[2]))) {
      /* country does not exist, create it */
      ast_log(LOG_NOTICE, "Country '%s' does not exist, creating it.\n", a->argv[2]);

      if (!(tz = ast_tone_zone_alloc())) {
         return CLI_FAILURE;
      }

      ast_copy_string(tz->country, a->argv[2], sizeof(tz->country));

      if (ast_register_indication_country(tz)) {
         ast_log(LOG_WARNING, "Unable to register new country\n");
         tz = ast_tone_zone_unref(tz);
         return CLI_FAILURE;
      }

      created_country = 1;
   }

   ast_tone_zone_lock(tz);

   if (ast_register_indication(tz, a->argv[3], a->argv[4])) {
      if (ast_strlen_zero(a->argv[3])) {
         ast_log(LOG_WARNING, "Unable to register indication %s\n", a->argv[2]);
      } else {
         ast_log(LOG_WARNING, "Unable to register indication %s/%s\n", a->argv[2], a->argv[3]);
      }
      if (created_country) {
         ast_unregister_indication_country(a->argv[2]);
      }
      res = CLI_FAILURE;
   }

   ast_tone_zone_unlock(tz);

   tz = ast_tone_zone_unref(tz);

   return res;
}

static char *complete_indications(struct ast_cli_args *a)
{
   size_t wordlen;
   struct ast_tone_zone_sound *ts;
   struct ast_tone_zone *tz;
   struct ast_tone_zone tmp_tz = {
      .nrringcadence = 0,
   };

   ast_copy_string(tmp_tz.country, a->argv[a->pos - 1], sizeof(tmp_tz.country));

   tz = ao2_find(ast_tone_zones, &tmp_tz, OBJ_POINTER);
   if (!tz) {
      return NULL;
   }

   wordlen = strlen(a->word);

   ast_tone_zone_lock(tz);
   AST_LIST_TRAVERSE(&tz->tones, ts, entry) {
      if (!strncasecmp(a->word, ts->name, wordlen)) {
         if (ast_cli_completion_add(ast_strdup(ts->name))) {
            break;
         }
      }
   }
   ast_tone_zone_unlock(tz);

   tz = ast_tone_zone_unref(tz);

   return NULL;
}

static char *handle_cli_indication_remove(struct ast_cli_entry *e, int cmd, struct ast_cli_args *a)
{
   struct ast_tone_zone *tz;
   char *res = CLI_SUCCESS;

   switch (cmd) {
   case CLI_INIT:
      e->command = "indication remove";
      e->usage =
         "Usage: indication remove <country> [indication]\n"
         "       Remove the given indication from the country.\n";
      return NULL;
   case CLI_GENERATE:
      if (a->pos == 2) {
         return complete_country(a);
      }
      if (a->pos == 3) {
         return complete_indications(a);
      }
      return NULL;
   }

   if (a->argc != 3 && a->argc != 4) {
      return CLI_SHOWUSAGE;
   }

   if (a->argc == 3) {
      /* remove entire country */
      if (ast_unregister_indication_country(a->argv[2])) {
         ast_log(LOG_WARNING, "Unable to unregister indication country %s\n", a->argv[2]);
         return CLI_FAILURE;
      }

      return CLI_SUCCESS;
   }

   if (!(tz = ast_get_indication_zone(a->argv[2]))) {
      ast_log(LOG_WARNING, "Unable to unregister indication %s/%s, country does not exists\n", a->argv[2], a->argv[3]);
      return CLI_FAILURE;
   }

   if (ast_unregister_indication(tz, a->argv[3])) {
      ast_log(LOG_WARNING, "Unable to unregister indication %s/%s\n", a->argv[2], a->argv[3]);
      res = CLI_FAILURE;
   }

   tz = ast_tone_zone_unref(tz);

   return res;
}

static char *handle_cli_indication_show(struct ast_cli_entry *e, int cmd, struct ast_cli_args *a)
{
   struct ast_tone_zone *tz = NULL;
   struct ast_str *buf;
   int found_country = 0;
   int i;

   switch (cmd) {
   case CLI_INIT:
      e->command = "indication show";
      e->usage =
         "Usage: indication show [<country> ...]\n"
         "       Display either a condensed summary of all countries and indications, or a\n"
         "       more verbose list of indications for the specified countries.\n";
      return NULL;
   case CLI_GENERATE:
      return complete_country(a);
   }

   if (a->argc == 2) {
      struct ao2_iterator iter;
      /* no arguments, show a list of countries */
      ast_cli(a->fd, "Country   Description\n");
      ast_cli(a->fd, "===========================\n");
      iter = ast_tone_zone_iterator_init();
      while ((tz = ao2_iterator_next(&iter))) {
         ast_tone_zone_lock(tz);
         ast_cli(a->fd, "%-7.7s  %s\n", tz->country, tz->description);
         ast_tone_zone_unlock(tz);
         tz = ast_tone_zone_unref(tz);
      }
      ao2_iterator_destroy(&iter);
      return CLI_SUCCESS;
   }

   buf = ast_str_alloca(256);

   for (i = 2; i < a->argc; i++) {
      struct ast_tone_zone zone_arg = {
         .nrringcadence = 0,
      };
      struct ast_tone_zone_sound *ts;
      int j;

      ast_copy_string(zone_arg.country, a->argv[i], sizeof(zone_arg.country));

      if (!(tz = ao2_find(ast_tone_zones, &zone_arg, OBJ_POINTER))) {
         continue;
      }

      if (!found_country) {
         found_country = 1;
         ast_cli(a->fd, "Country Indication      PlayList\n");
         ast_cli(a->fd, "=====================================\n");
      }

      ast_tone_zone_lock(tz);

      ast_str_set(&buf, 0, "%-7.7s %-15.15s ", tz->country, "<ringcadence>");
      for (j = 0; j < tz->nrringcadence; j++) {
         ast_str_append(&buf, 0, "%d%s", tz->ringcadence[j],
               (j == tz->nrringcadence - 1) ? "" : ",");
      }
      ast_str_append(&buf, 0, "\n");
      ast_cli(a->fd, "%s", ast_str_buffer(buf));

      AST_LIST_TRAVERSE(&tz->tones, ts, entry) {
         ast_cli(a->fd, "%-7.7s %-15.15s %s\n", tz->country, ts->name, ts->data);
      }

      ast_tone_zone_unlock(tz);
      tz = ast_tone_zone_unref(tz);
   }

   if (!found_country) {
      ast_cli(a->fd, "No countries matched your criteria.\n");
   }

   return CLI_SUCCESS;
}

static int is_valid_tone_zone(struct ast_tone_zone *zone)
{
   int res;

   ast_tone_zone_lock(zone);
   res = (!ast_strlen_zero(zone->description) && !AST_LIST_EMPTY(&zone->tones));
   ast_tone_zone_unlock(zone);

   return res;
}

/*!\brief
 *
 * \note This is called with the tone zone locked.
 */
static void store_tone_zone_ring_cadence(struct ast_tone_zone *zone, const char *val)
{
   char buf[1024];
   char *ring, *c = buf;

   ast_copy_string(buf, val, sizeof(buf));

   while ((ring = strsep(&c, ","))) {
      int *tmp, value;

      ring = ast_strip(ring);

      if (!isdigit(ring[0]) || (value = atoi(ring)) == -1) {
         ast_log(LOG_WARNING, "Invalid ringcadence given '%s'.\n", ring);
         continue;
      }

      if (!(tmp = ast_realloc(zone->ringcadence, (zone->nrringcadence + 1) * sizeof(int)))) {
         return;
      }

      zone->ringcadence = tmp;
      tmp[zone->nrringcadence] = value;
      zone->nrringcadence++;
   }
}

static void store_config_tone_zone(struct ast_tone_zone *zone, const char *var,
      const char *value)
{
   CV_START(var, value);

   CV_STR("description", zone->description);
   CV_F("ringcadence", store_tone_zone_ring_cadence(zone, value));

   ast_register_indication(zone, var, value);

   CV_END;
}

static void reset_tone_zone(struct ast_tone_zone *zone)
{
   ast_tone_zone_lock(zone);

   zone->killme = 0;

   if (zone->nrringcadence) {
      zone->nrringcadence = 0;
      ast_free(zone->ringcadence);
      zone->ringcadence = NULL;
   }

   ast_tone_zone_unlock(zone);
}

static int parse_tone_zone(struct ast_config *cfg, const char *country)
{
   struct ast_variable *v;
   struct ast_tone_zone *zone;
   struct ast_tone_zone tmp_zone = {
      .nrringcadence = 0,
   };
   int allocd = 0;

   ast_copy_string(tmp_zone.country, country, sizeof(tmp_zone.country));

   if ((zone = ao2_find(ast_tone_zones, &tmp_zone, OBJ_POINTER))) {
      reset_tone_zone(zone);
   } else if ((zone = ast_tone_zone_alloc())) {
      allocd = 1;
      ast_copy_string(zone->country, country, sizeof(zone->country));
   } else {
      return -1;
   }

   ast_tone_zone_lock(zone);
   for (v = ast_variable_browse(cfg, country); v; v = v->next) {
      store_config_tone_zone(zone, v->name, v->value);
   }
   ast_tone_zone_unlock(zone);

   if (allocd) {
      if (!is_valid_tone_zone(zone)) {
         ast_log(LOG_WARNING, "Indication country '%s' is invalid\n", country);
      } else if (ast_register_indication_country(zone)) {
         ast_log(LOG_WARNING, "Unable to register indication country '%s'.\n",
               country);
      }
   }

   zone = ast_tone_zone_unref(zone);

   return 0;
}

/*! \brief
 * Mark the zone and its tones before parsing configuration.  We will use this
 * to know what to remove after configuration is parsed.
 */
static int tone_zone_mark(void *obj, void *arg, int flags)
{
   struct ast_tone_zone *zone = obj;
   struct ast_tone_zone_sound *s;

   ast_tone_zone_lock(zone);

   zone->killme = 1;

   AST_LIST_TRAVERSE(&zone->tones, s, entry) {
      s->killme = 1;
   }

   ast_tone_zone_unlock(zone);

   return 0;
}

/*! \brief
 * Prune tones no longer in the configuration, and have the tone zone unlinked
 * if it is no longer in the configuration at all.
 */
static int prune_tone_zone(void *obj, void *arg, int flags)
{
   struct ast_tone_zone *zone = obj;
   struct ast_tone_zone_sound *s;

   ast_tone_zone_lock(zone);

   AST_LIST_TRAVERSE_SAFE_BEGIN(&zone->tones, s, entry) {
      if (s->killme) {
         AST_LIST_REMOVE_CURRENT(entry);
         s = ast_tone_zone_sound_unref(s);
      }
   }
   AST_LIST_TRAVERSE_SAFE_END;

   ast_tone_zone_unlock(zone);

   return zone->killme ? CMP_MATCH : 0;
}

/*! \brief load indications module */
static int load_indications(int reload)
{
   struct ast_config *cfg;
   const char *cxt = NULL;
   const char *country = NULL;
   struct ast_flags config_flags = { reload ? CONFIG_FLAG_FILEUNCHANGED : 0 };
   int res = -1;

   cfg = ast_config_load2(config, "indications", config_flags);

   if (cfg == CONFIG_STATUS_FILEMISSING || cfg == CONFIG_STATUS_FILEINVALID) {
      ast_log(LOG_WARNING, "Can't find indications config file %s.\n", config);
      return 0;
   } else if (cfg == CONFIG_STATUS_FILEUNCHANGED) {
      return 0;
   }

   /* Lock the container to prevent multiple simultaneous reloads */
   ao2_lock(ast_tone_zones);

   ao2_callback(ast_tone_zones, OBJ_NODATA, tone_zone_mark, NULL);

   /* Use existing config to populate the Indication table */
   while ((cxt = ast_category_browse(cfg, cxt))) {
      /* All categories but "general" are considered countries */
      if (!strcasecmp(cxt, "general")) {
         continue;
      }

      if (parse_tone_zone(cfg, cxt)) {
         goto return_cleanup;
      }
   }

   ao2_callback(ast_tone_zones, OBJ_NODATA | OBJ_MULTIPLE | OBJ_UNLINK,
         prune_tone_zone, NULL);

   /* determine which country is the default */
   country = ast_variable_retrieve(cfg, "general", "country");
   if (ast_strlen_zero(country) || ast_set_indication_country(country)) {
      ast_log(LOG_WARNING, "Unable to set the default country (for indication tones)\n");
   }

   res = 0;

return_cleanup:
   ao2_unlock(ast_tone_zones);
   ast_config_destroy(cfg);

   return res;
}

/*! \brief CLI entries for commands provided by this module */
static struct ast_cli_entry cli_indications[] = {
   AST_CLI_DEFINE(handle_cli_indication_add,    "Add the given indication to the country"),
   AST_CLI_DEFINE(handle_cli_indication_remove, "Remove the given indication from the country"),
   AST_CLI_DEFINE(handle_cli_indication_show,   "Display a list of all countries/indications")
};

static int ast_tone_zone_hash(const void *obj, const int flags)
{
   const struct ast_tone_zone *zone = obj;

   return ast_str_case_hash(zone->country);
}

static int ast_tone_zone_cmp(void *obj, void *arg, int flags)
{
   struct ast_tone_zone *zone = obj;
   struct ast_tone_zone *zone_arg = arg;

   return (!strcasecmp(zone->country, zone_arg->country)) ?
         CMP_MATCH | CMP_STOP : 0;
}

/*!
 * \internal
 * \brief Clean up resources on Asterisk shutdown
 */
static int unload_module(void)
{
   ast_cli_unregister_multiple(cli_indications, ARRAY_LEN(cli_indications));
   if (default_tone_zone) {
      ast_tone_zone_unref(default_tone_zone);
      default_tone_zone = NULL;
   }
   if (ast_tone_zones) {
      ao2_ref(ast_tone_zones, -1);
      ast_tone_zones = NULL;
   }

   return 0;
}

/*! \brief Load indications module */
static int load_module(void)
{
   ast_tone_zones = ao2_container_alloc_hash(AO2_ALLOC_OPT_LOCK_MUTEX, 0,
      NUM_TONE_ZONE_BUCKETS, ast_tone_zone_hash, NULL, ast_tone_zone_cmp);
   if (!ast_tone_zones) {
      return AST_MODULE_LOAD_FAILURE;
   }

   if (load_indications(0)) {
      return AST_MODULE_LOAD_FAILURE;
   }

   ast_cli_register_multiple(cli_indications, ARRAY_LEN(cli_indications));

   return AST_MODULE_LOAD_SUCCESS;
}

/*! \brief Reload indications module */
static int reload_module(void)
{
   return load_indications(1);
}

AST_MODULE_INFO(ASTERISK_GPL_KEY, AST_MODFLAG_GLOBAL_SYMBOLS | AST_MODFLAG_LOAD_ORDER, "Indication Tone Handling",
   .support_level = AST_MODULE_SUPPORT_CORE,
   .load = load_module,
   .unload = unload_module,
   .reload = reload_module,
   .load_pri = AST_MODPRI_CORE,
   .requires = "extconfig",
);