app.c

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/*
 * Asterisk -- An open source telephony toolkit.
 *
 * Copyright (C) 1999 - 2005, 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 Convenient Application Routines
 *
 * \author Mark Spencer <markster@digium.com>
 */

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

#include "asterisk.h"

ASTERISK_FILE_VERSION(__FILE__, "$Revision: 421125 $")

#ifdef HAVE_SYS_STAT_H
#include <sys/stat.h>
#endif
#include <regex.h>          /* for regcomp(3) */
#include <sys/file.h>       /* for flock(2) */
#include <signal.h>         /* for pthread_sigmask(3) */
#include <stdlib.h>         /* for closefrom(3) */
#include <sys/types.h>
#include <sys/wait.h>       /* for waitpid(2) */
#ifndef HAVE_CLOSEFROM
#include <dirent.h>         /* for opendir(3)   */
#endif
#ifdef HAVE_CAP
#include <sys/capability.h>
#endif /* HAVE_CAP */

#include "asterisk/paths.h"   /* use ast_config_AST_DATA_DIR */
#include "asterisk/channel.h"
#include "asterisk/pbx.h"
#include "asterisk/file.h"
#include "asterisk/app.h"
#include "asterisk/dsp.h"
#include "asterisk/utils.h"
#include "asterisk/lock.h"
#include "asterisk/indications.h"
#include "asterisk/linkedlists.h"
#include "asterisk/threadstorage.h"
#include "asterisk/test.h"
#include "asterisk/module.h"

AST_THREADSTORAGE_PUBLIC(ast_str_thread_global_buf);

static pthread_t shaun_of_the_dead_thread = AST_PTHREADT_NULL;

struct zombie {
   pid_t pid;
   AST_LIST_ENTRY(zombie) list;
};

static AST_LIST_HEAD_STATIC(zombies, zombie);

static void *shaun_of_the_dead(void *data)
{
   struct zombie *cur;
   int status;
   for (;;) {
      if (!AST_LIST_EMPTY(&zombies)) {
         /* Don't allow cancellation while we have a lock. */
         pthread_setcancelstate(PTHREAD_CANCEL_DISABLE, NULL);
         AST_LIST_LOCK(&zombies);
         AST_LIST_TRAVERSE_SAFE_BEGIN(&zombies, cur, list) {
            if (waitpid(cur->pid, &status, WNOHANG) != 0) {
               AST_LIST_REMOVE_CURRENT(list);
               ast_free(cur);
            }
         }
         AST_LIST_TRAVERSE_SAFE_END
         AST_LIST_UNLOCK(&zombies);
         pthread_setcancelstate(PTHREAD_CANCEL_ENABLE, NULL);
      }
      pthread_testcancel();
      /* Wait for 60 seconds, without engaging in a busy loop. */
      ast_poll(NULL, 0, AST_LIST_FIRST(&zombies) ? 5000 : 60000);
   }
   return NULL;
}


#define AST_MAX_FORMATS 10

static AST_RWLIST_HEAD_STATIC(groups, ast_group_info);

/*!
 * \brief This function presents a dialtone and reads an extension into 'collect'
 * which must be a pointer to a **pre-initialized** array of char having a
 * size of 'size' suitable for writing to.  It will collect no more than the smaller
 * of 'maxlen' or 'size' minus the original strlen() of collect digits.
 * \param chan struct.
 * \param context
 * \param collect
 * \param size
 * \param maxlen
 * \param timeout timeout in milliseconds
 *
 * \return 0 if extension does not exist, 1 if extension exists
*/
int ast_app_dtget(struct ast_channel *chan, const char *context, char *collect, size_t size, int maxlen, int timeout)
{
   struct ast_tone_zone_sound *ts;
   int res = 0, x = 0;

   if (maxlen > size) {
      maxlen = size;
   }

   if (!timeout) {
      if (chan->pbx && chan->pbx->dtimeoutms) {
         timeout = chan->pbx->dtimeoutms;
      } else {
         timeout = 5000;
      }
   }

   if ((ts = ast_get_indication_tone(chan->zone, "dial"))) {
      res = ast_playtones_start(chan, 0, ts->data, 0);
      ts = ast_tone_zone_sound_unref(ts);
   } else {
      ast_log(LOG_NOTICE, "Huh....? no dial for indications?\n");
   }

   for (x = strlen(collect); x < maxlen; ) {
      res = ast_waitfordigit(chan, timeout);
      if (!ast_ignore_pattern(context, collect)) {
         ast_playtones_stop(chan);
      }
      if (res < 1) {
         break;
      }
      if (res == '#') {
         break;
      }
      collect[x++] = res;
      if (!ast_matchmore_extension(chan, context, collect, 1,
         S_COR(chan->caller.id.number.valid, chan->caller.id.number.str, NULL))) {
         break;
      }
   }

   if (res >= 0) {
      res = ast_exists_extension(chan, context, collect, 1,
         S_COR(chan->caller.id.number.valid, chan->caller.id.number.str, NULL)) ? 1 : 0;
   }

   return res;
}

/*!
 * \brief ast_app_getdata
 * \param c The channel to read from
 * \param prompt The file to stream to the channel
 * \param s The string to read in to.  Must be at least the size of your length
 * \param maxlen How many digits to read (maximum)
 * \param timeout set timeout to 0 for "standard" timeouts. Set timeout to -1 for 
 *      "ludicrous time" (essentially never times out) */
enum ast_getdata_result ast_app_getdata(struct ast_channel *c, const char *prompt, char *s, int maxlen, int timeout)
{
   int res = 0, to, fto;
   char *front, *filename;

   /* XXX Merge with full version? XXX */

   if (maxlen)
      s[0] = '\0';

   if (!prompt)
      prompt = "";

   filename = ast_strdupa(prompt);
   while ((front = strsep(&filename, "&"))) {
      if (!ast_strlen_zero(front)) {
         res = ast_streamfile(c, front, c->language);
         if (res)
            continue;
      }
      if (ast_strlen_zero(filename)) {
         /* set timeouts for the last prompt */
         fto = c->pbx ? c->pbx->rtimeoutms : 6000;
         to = c->pbx ? c->pbx->dtimeoutms : 2000;

         if (timeout > 0) {
            fto = to = timeout;
         }
         if (timeout < 0) {
            fto = to = 1000000000;
         }
      } else {
         /* there is more than one prompt, so
          * get rid of the long timeout between
          * prompts, and make it 50ms */
         fto = 50;
         to = c->pbx ? c->pbx->dtimeoutms : 2000;
      }
      res = ast_readstring(c, s, maxlen, to, fto, "#");
      if (res == AST_GETDATA_EMPTY_END_TERMINATED) {
         return res;
      }
      if (!ast_strlen_zero(s)) {
         return res;
      }
   }

   return res;
}

/* The lock type used by ast_lock_path() / ast_unlock_path() */
static enum AST_LOCK_TYPE ast_lock_type = AST_LOCK_TYPE_LOCKFILE;

int ast_app_getdata_full(struct ast_channel *c, const char *prompt, char *s, int maxlen, int timeout, int audiofd, int ctrlfd)
{
   int res, to = 2000, fto = 6000;

   if (!ast_strlen_zero(prompt)) {
      res = ast_streamfile(c, prompt, c->language);
      if (res < 0) {
         return res;
      }
   }

   if (timeout > 0) {
      fto = to = timeout;
   }
   if (timeout < 0) {
      fto = to = 1000000000;
   }

   res = ast_readstring_full(c, s, maxlen, to, fto, "#", audiofd, ctrlfd);

   return res;
}

int ast_app_exec_macro(struct ast_channel *autoservice_chan, struct ast_channel *macro_chan, const char *macro_args)
{
   struct ast_app *macro_app;
   int res;

   macro_app = pbx_findapp("Macro");
   if (!macro_app) {
      ast_log(LOG_WARNING,
         "Cannot run 'Macro(%s)'.  The application is not available.\n", macro_args);
      return -1;
   }
   if (autoservice_chan) {
      ast_autoservice_start(autoservice_chan);
   }

   ast_debug(4, "%s Original location: %s,%s,%d\n", macro_chan->name,
      macro_chan->context, macro_chan->exten, macro_chan->priority);

   res = pbx_exec(macro_chan, macro_app, macro_args);
   ast_debug(4, "Macro exited with status %d\n", res);

   /*
    * Assume anything negative from Macro is an error.
    * Anything else is success.
    */
   if (res < 0) {
      res = -1;
   } else {
      res = 0;
   }

   ast_debug(4, "%s Ending location: %s,%s,%d\n", macro_chan->name,
      macro_chan->context, macro_chan->exten, macro_chan->priority);

   if (autoservice_chan) {
      ast_autoservice_stop(autoservice_chan);
   }
   return res;
}

int ast_app_run_macro(struct ast_channel *autoservice_chan, struct ast_channel *macro_chan, const char *macro_name, const char *macro_args)
{
   int res;
   char *args_str;
   size_t args_len;

   if (ast_strlen_zero(macro_args)) {
      return ast_app_exec_macro(autoservice_chan, macro_chan, macro_name);
   }

   /* Create the Macro application argument string. */
   args_len = strlen(macro_name) + strlen(macro_args) + 2;
   args_str = ast_malloc(args_len);
   if (!args_str) {
      return -1;
   }
   snprintf(args_str, args_len, "%s,%s", macro_name, macro_args);

   res = ast_app_exec_macro(autoservice_chan, macro_chan, args_str);
   ast_free(args_str);
   return res;
}

static const struct ast_app_stack_funcs *app_stack_callbacks;

void ast_install_stack_functions(const struct ast_app_stack_funcs *funcs)
{
   app_stack_callbacks = funcs;
}

const char *ast_app_expand_sub_args(struct ast_channel *chan, const char *args)
{
   const struct ast_app_stack_funcs *funcs;
   const char *new_args;

   funcs = app_stack_callbacks;
   if (!funcs || !funcs->expand_sub_args) {
      ast_log(LOG_WARNING,
         "Cannot expand 'Gosub(%s)' arguments.  The app_stack module is not available.\n",
         args);
      return NULL;
   }
   ast_module_ref(funcs->module);

   new_args = funcs->expand_sub_args(chan, args);
   ast_module_unref(funcs->module);
   return new_args;
}

int ast_app_exec_sub(struct ast_channel *autoservice_chan, struct ast_channel *sub_chan, const char *sub_args, int ignore_hangup)
{
   const struct ast_app_stack_funcs *funcs;
   int res;

   funcs = app_stack_callbacks;
   if (!funcs || !funcs->run_sub) {
      ast_log(LOG_WARNING,
         "Cannot run 'Gosub(%s)'.  The app_stack module is not available.\n",
         sub_args);
      return -1;
   }
   ast_module_ref(funcs->module);

   if (autoservice_chan) {
      ast_autoservice_start(autoservice_chan);
   }

   res = funcs->run_sub(sub_chan, sub_args, ignore_hangup);
   ast_module_unref(funcs->module);

   if (autoservice_chan) {
      ast_autoservice_stop(autoservice_chan);
   }
   return res;
}

int ast_app_run_sub(struct ast_channel *autoservice_chan, struct ast_channel *sub_chan, const char *sub_location, const char *sub_args, int ignore_hangup)
{
   int res;
   char *args_str;
   size_t args_len;

   if (ast_strlen_zero(sub_args)) {
      return ast_app_exec_sub(autoservice_chan, sub_chan, sub_location, ignore_hangup);
   }

   /* Create the Gosub application argument string. */
   args_len = strlen(sub_location) + strlen(sub_args) + 3;
   args_str = ast_malloc(args_len);
   if (!args_str) {
      return -1;
   }
   snprintf(args_str, args_len, "%s(%s)", sub_location, sub_args);

   res = ast_app_exec_sub(autoservice_chan, sub_chan, args_str, ignore_hangup);
   ast_free(args_str);
   return res;
}

static int (*ast_has_voicemail_func)(const char *mailbox, const char *folder) = NULL;
static int (*ast_inboxcount_func)(const char *mailbox, int *newmsgs, int *oldmsgs) = NULL;
static int (*ast_inboxcount2_func)(const char *mailbox, int *urgentmsgs, int *newmsgs, int *oldmsgs) = NULL;
static int (*ast_sayname_func)(struct ast_channel *chan, const char *mailbox, const char *context) = NULL;
static int (*ast_messagecount_func)(const char *context, const char *mailbox, const char *folder) = NULL;

void ast_install_vm_functions(int (*has_voicemail_func)(const char *mailbox, const char *folder),
               int (*inboxcount_func)(const char *mailbox, int *newmsgs, int *oldmsgs),
               int (*inboxcount2_func)(const char *mailbox, int *urgentmsgs, int *newmsgs, int *oldmsgs),
               int (*messagecount_func)(const char *context, const char *mailbox, const char *folder),
               int (*sayname_func)(struct ast_channel *chan, const char *mailbox, const char *context))
{
   ast_has_voicemail_func = has_voicemail_func;
   ast_inboxcount_func = inboxcount_func;
   ast_inboxcount2_func = inboxcount2_func;
   ast_messagecount_func = messagecount_func;
   ast_sayname_func = sayname_func;
}

void ast_uninstall_vm_functions(void)
{
   ast_has_voicemail_func = NULL;
   ast_inboxcount_func = NULL;
   ast_inboxcount2_func = NULL;
   ast_messagecount_func = NULL;
   ast_sayname_func = NULL;
}

int ast_app_has_voicemail(const char *mailbox, const char *folder)
{
   static int warned = 0;
   if (ast_has_voicemail_func) {
      return ast_has_voicemail_func(mailbox, folder);
   }

   if (warned++ % 10 == 0) {
      ast_verb(3, "Message check requested for mailbox %s/folder %s but voicemail not loaded.\n", mailbox, folder ? folder : "INBOX");
   }
   return 0;
}


int ast_app_inboxcount(const char *mailbox, int *newmsgs, int *oldmsgs)
{
   static int warned = 0;
   if (newmsgs) {
      *newmsgs = 0;
   }
   if (oldmsgs) {
      *oldmsgs = 0;
   }
   if (ast_inboxcount_func) {
      return ast_inboxcount_func(mailbox, newmsgs, oldmsgs);
   }

   if (warned++ % 10 == 0) {
      ast_verb(3, "Message count requested for mailbox %s but voicemail not loaded.\n", mailbox);
   }

   return 0;
}

int ast_app_inboxcount2(const char *mailbox, int *urgentmsgs, int *newmsgs, int *oldmsgs)
{
   static int warned = 0;
   if (newmsgs) {
      *newmsgs = 0;
   }
   if (oldmsgs) {
      *oldmsgs = 0;
   }
   if (urgentmsgs) {
      *urgentmsgs = 0;
   }
   if (ast_inboxcount2_func) {
      return ast_inboxcount2_func(mailbox, urgentmsgs, newmsgs, oldmsgs);
   }

   if (warned++ % 10 == 0) {
      ast_verb(3, "Message count requested for mailbox %s but voicemail not loaded.\n", mailbox);
   }

   return 0;
}

int ast_app_sayname(struct ast_channel *chan, const char *mailbox, const char *context)
{
   if (ast_sayname_func) {
      return ast_sayname_func(chan, mailbox, context);
   }
   return -1;
}

int ast_app_messagecount(const char *context, const char *mailbox, const char *folder)
{
   static int warned = 0;
   if (ast_messagecount_func) {
      return ast_messagecount_func(context, mailbox, folder);
   }

   if (!warned) {
      warned++;
      ast_verb(3, "Message count requested for mailbox %s@%s/%s but voicemail not loaded.\n", mailbox, context, folder);
   }

   return 0;
}

int ast_dtmf_stream(struct ast_channel *chan, struct ast_channel *peer, const char *digits, int between, unsigned int duration) 
{
   const char *ptr;
   int res = 0;
   struct ast_silence_generator *silgen = NULL;

   if (!between) {
      between = 100;
   }

   if (peer) {
      res = ast_autoservice_start(peer);
   }

   if (!res) {
      res = ast_waitfor(chan, 100);
   }

   /* ast_waitfor will return the number of remaining ms on success */
   if (res < 0) {
      if (peer) {
         ast_autoservice_stop(peer);
      }
      return res;
   }

   if (ast_opt_transmit_silence) {
      silgen = ast_channel_start_silence_generator(chan);
   }

   for (ptr = digits; *ptr; ptr++) {
      if (*ptr == 'w') {
         /* 'w' -- wait half a second */
         if ((res = ast_safe_sleep(chan, 500))) {
            break;
         }
      } else if (strchr("0123456789*#abcdfABCDF", *ptr)) {
         /* Character represents valid DTMF */
         if (*ptr == 'f' || *ptr == 'F') {
            /* ignore return values if not supported by channel */
            ast_indicate(chan, AST_CONTROL_FLASH);
         } else {
            ast_senddigit(chan, *ptr, duration);
         }
         /* pause between digits */
         if ((res = ast_safe_sleep(chan, between))) {
            break;
         }
      } else {
         ast_log(LOG_WARNING, "Illegal DTMF character '%c' in string. (0-9*#aAbBcCdD allowed)\n", *ptr);
      }
   }

   if (peer) {
      /* Stop autoservice on the peer channel, but don't overwrite any error condition
         that has occurred previously while acting on the primary channel */
      if (ast_autoservice_stop(peer) && !res) {
         res = -1;
      }
   }

   if (silgen) {
      ast_channel_stop_silence_generator(chan, silgen);
   }

   return res;
}

struct linear_state {
   int fd;
   int autoclose;
   int allowoverride;
   int origwfmt;
};

static void linear_release(struct ast_channel *chan, void *params)
{
   struct linear_state *ls = params;

   if (ls->origwfmt && ast_set_write_format(chan, ls->origwfmt)) {
      ast_log(LOG_WARNING, "Unable to restore channel '%s' to format '%d'\n", chan->name, ls->origwfmt);
   }

   if (ls->autoclose) {
      close(ls->fd);
   }

   ast_free(params);
}

static int linear_generator(struct ast_channel *chan, void *data, int len, int samples)
{
   short buf[2048 + AST_FRIENDLY_OFFSET / 2];
   struct linear_state *ls = data;
   struct ast_frame f = {
      .frametype = AST_FRAME_VOICE,
      .subclass.codec = AST_FORMAT_SLINEAR,
      .data.ptr = buf + AST_FRIENDLY_OFFSET / 2,
      .offset = AST_FRIENDLY_OFFSET,
   };
   int res;

   len = samples * 2;
   if (len > sizeof(buf) - AST_FRIENDLY_OFFSET) {
      ast_log(LOG_WARNING, "Can't generate %d bytes of data!\n" , len);
      len = sizeof(buf) - AST_FRIENDLY_OFFSET;
   }
   res = read(ls->fd, buf + AST_FRIENDLY_OFFSET/2, len);
   if (res > 0) {
      f.datalen = res;
      f.samples = res / 2;
      ast_write(chan, &f);
      if (res == len) {
         return 0;
      }
   }
   return -1;
}

static void *linear_alloc(struct ast_channel *chan, void *params)
{
   struct linear_state *ls = params;

   if (!params) {
      return NULL;
   }

   /* In this case, params is already malloc'd */
   if (ls->allowoverride) {
      ast_set_flag(chan, AST_FLAG_WRITE_INT);
   } else {
      ast_clear_flag(chan, AST_FLAG_WRITE_INT);
   }

   ls->origwfmt = chan->writeformat;

   if (ast_set_write_format(chan, AST_FORMAT_SLINEAR)) {
      ast_log(LOG_WARNING, "Unable to set '%s' to linear format (write)\n", chan->name);
      ast_free(ls);
      ls = params = NULL;
   }

   return params;
}

static struct ast_generator linearstream =
{
   .alloc = linear_alloc,
   .release = linear_release,
   .generate = linear_generator,
};

int ast_linear_stream(struct ast_channel *chan, const char *filename, int fd, int allowoverride)
{
   struct linear_state *lin;
   char tmpf[256];
   int res = -1;
   int autoclose = 0;
   if (fd < 0) {
      if (ast_strlen_zero(filename)) {
         return -1;
      }
      autoclose = 1;
      if (filename[0] == '/') {
         ast_copy_string(tmpf, filename, sizeof(tmpf));
      } else {
         snprintf(tmpf, sizeof(tmpf), "%s/%s/%s", ast_config_AST_DATA_DIR, "sounds", filename);
      }
      if ((fd = open(tmpf, O_RDONLY)) < 0) {
         ast_log(LOG_WARNING, "Unable to open file '%s': %s\n", tmpf, strerror(errno));
         return -1;
      }
   }
   if ((lin = ast_calloc(1, sizeof(*lin)))) {
      lin->fd = fd;
      lin->allowoverride = allowoverride;
      lin->autoclose = autoclose;
      res = ast_activate_generator(chan, &linearstream, lin);
   }
   return res;
}

int ast_control_streamfile(struct ast_channel *chan, const char *file,
            const char *fwd, const char *rev,
            const char *stop, const char *suspend,
            const char *restart, int skipms, long *offsetms)
{
   char *breaks = NULL;
   char *end = NULL;
   int blen = 2;
   int res;
   long pause_restart_point = 0;
   long offset = 0;

   if (!file) {
      return -1;
   }
   if (offsetms) {
      offset = *offsetms * 8; /* XXX Assumes 8kHz */
   }

   if (stop) {
      blen += strlen(stop);
   }
   if (suspend) {
      blen += strlen(suspend);
   }
   if (restart) {
      blen += strlen(restart);
   }

   if (blen > 2) {
      breaks = ast_alloca(blen + 1);
      breaks[0] = '\0';
      if (stop) {
         strcat(breaks, stop);
      }
      if (suspend) {
         strcat(breaks, suspend);
      }
      if (restart) {
         strcat(breaks, restart);
      }
   }
   if (chan->_state != AST_STATE_UP) {
      res = ast_answer(chan);
   }

   if ((end = strchr(file, ':'))) {
      if (!strcasecmp(end, ":end")) {
         *end = '\0';
         end++;
      }
   }

   for (;;) {
      ast_stopstream(chan);
      res = ast_streamfile(chan, file, chan->language);
      if (!res) {
         if (pause_restart_point) {
            ast_seekstream(chan->stream, pause_restart_point, SEEK_SET);
            pause_restart_point = 0;
         }
         else if (end || offset < 0) {
            if (offset == -8) {
               offset = 0;
            }
            ast_verb(3, "ControlPlayback seek to offset %ld from end\n", offset);

            ast_seekstream(chan->stream, offset, SEEK_END);
            end = NULL;
            offset = 0;
         } else if (offset) {
            ast_verb(3, "ControlPlayback seek to offset %ld\n", offset);
            ast_seekstream(chan->stream, offset, SEEK_SET);
            offset = 0;
         }
         res = ast_waitstream_fr(chan, breaks, fwd, rev, skipms);
      }

      if (res < 1) {
         break;
      }

      /* We go at next loop if we got the restart char */
      if (restart && strchr(restart, res)) {
         ast_debug(1, "we'll restart the stream here at next loop\n");
         pause_restart_point = 0;
         continue;
      }

      if (suspend && strchr(suspend, res)) {
         pause_restart_point = ast_tellstream(chan->stream);
         for (;;) {
            ast_stopstream(chan);
            if (!(res = ast_waitfordigit(chan, 1000))) {
               continue;
            } else if (res == -1 || strchr(suspend, res) || (stop && strchr(stop, res))) {
               break;
            }
         }
         if (res == *suspend) {
            res = 0;
            continue;
         }
      }

      if (res == -1) {
         break;
      }

      /* if we get one of our stop chars, return it to the calling function */
      if (stop && strchr(stop, res)) {
         break;
      }
   }

   if (pause_restart_point) {
      offset = pause_restart_point;
   } else {
      if (chan->stream) {
         offset = ast_tellstream(chan->stream);
      } else {
         offset = -8;  /* indicate end of file */
      }
   }

   if (offsetms) {
      *offsetms = offset / 8; /* samples --> ms ... XXX Assumes 8 kHz */
   }

   /* If we are returning a digit cast it as char */
   if (res > 0 || chan->stream) {
      res = (char)res;
   }

   ast_stopstream(chan);

   return res;
}

int ast_play_and_wait(struct ast_channel *chan, const char *fn)
{
   int d = 0;

   if ((d = ast_streamfile(chan, fn, chan->language))) {
      return d;
   }

   d = ast_waitstream(chan, AST_DIGIT_ANY);

   ast_stopstream(chan);

   return d;
}

static int global_silence_threshold = 128;
static int global_maxsilence = 0;

/*! Optionally play a sound file or a beep, then record audio and video from the channel.
 * \param chan Channel to playback to/record from.
 * \param playfile Filename of sound to play before recording begins.
 * \param recordfile Filename to record to.
 * \param maxtime Maximum length of recording (in seconds).
 * \param fmt Format(s) to record message in. Multiple formats may be specified by separating them with a '|'.
 * \param duration Where to store actual length of the recorded message (in milliseconds).
 * \param sound_duration Where to store the length of the recorded message (in milliseconds), minus any silence
 * \param beep Whether to play a beep before starting to record.
 * \param silencethreshold
 * \param maxsilence Length of silence that will end a recording (in milliseconds).
 * \param path Optional filesystem path to unlock.
 * \param prepend If true, prepend the recorded audio to an existing file and follow prepend mode recording rules
 * \param acceptdtmf DTMF digits that will end the recording.
 * \param canceldtmf DTMF digits that will cancel the recording.
 * \param skip_confirmation_sound If true, don't play auth-thankyou at end. Nice for custom recording prompts in apps.
 *
 * \retval -1 failure or hangup
 * \retval 'S' Recording ended from silence timeout
 * \retval 't' Recording ended from the message exceeding the maximum duration, or via DTMF in prepend mode
 * \retval dtmfchar Recording ended via the return value's DTMF character for either cancel or accept.
 */
static int __ast_play_and_record(struct ast_channel *chan, const char *playfile, const char *recordfile, int maxtime, const char *fmt, int *duration, int *sound_duration, int beep, int silencethreshold, int maxsilence, const char *path, int prepend, const char *acceptdtmf, const char *canceldtmf, int skip_confirmation_sound)
{
   int d = 0;
   char *fmts;
   char comment[256];
   int x, fmtcnt = 1, res = -1, outmsg = 0;
   struct ast_filestream *others[AST_MAX_FORMATS];
   char *sfmt[AST_MAX_FORMATS];
   char *stringp = NULL;
   time_t start, end;
   struct ast_dsp *sildet = NULL;   /* silence detector dsp */
   int totalsilence = 0;
   int dspsilence = 0;
   int olddspsilence = 0;
   int rfmt = 0;
   struct ast_silence_generator *silgen = NULL;
   char prependfile[80];

   if (silencethreshold < 0) {
      silencethreshold = global_silence_threshold;
   }

   if (maxsilence < 0) {
      maxsilence = global_maxsilence;
   }

   /* barf if no pointer passed to store duration in */
   if (!duration) {
      ast_log(LOG_WARNING, "Error play_and_record called without duration pointer\n");
      return -1;
   }

   ast_debug(1, "play_and_record: %s, %s, '%s'\n", playfile ? playfile : "<None>", recordfile, fmt);
   snprintf(comment, sizeof(comment), "Playing %s, Recording to: %s on %s\n", playfile ? playfile : "<None>", recordfile, chan->name);

   if (playfile || beep) {
      if (!beep) {
         d = ast_play_and_wait(chan, playfile);
      }
      if (d > -1) {
         d = ast_stream_and_wait(chan, "beep", "");
      }
      if (d < 0) {
         return -1;
      }
   }

   if (prepend) {
      ast_copy_string(prependfile, recordfile, sizeof(prependfile));
      strncat(prependfile, "-prepend", sizeof(prependfile) - strlen(prependfile) - 1);
   }

   fmts = ast_strdupa(fmt);

   stringp = fmts;
   strsep(&stringp, "|");
   ast_debug(1, "Recording Formats: sfmts=%s\n", fmts);
   sfmt[0] = ast_strdupa(fmts);

   while ((fmt = strsep(&stringp, "|"))) {
      if (fmtcnt > AST_MAX_FORMATS - 1) {
         ast_log(LOG_WARNING, "Please increase AST_MAX_FORMATS in file.h\n");
         break;
      }
      sfmt[fmtcnt++] = ast_strdupa(fmt);
   }

   end = start = time(NULL);  /* pre-initialize end to be same as start in case we never get into loop */
   for (x = 0; x < fmtcnt; x++) {
      others[x] = ast_writefile(prepend ? prependfile : recordfile, sfmt[x], comment, O_TRUNC, 0, AST_FILE_MODE);
      ast_verb(3, "x=%d, open writing:  %s format: %s, %p\n", x, prepend ? prependfile : recordfile, sfmt[x], others[x]);

      if (!others[x]) {
         break;
      }
   }

   if (path) {
      ast_unlock_path(path);
   }

   if (maxsilence > 0) {
      sildet = ast_dsp_new(); /* Create the silence detector */
      if (!sildet) {
         ast_log(LOG_WARNING, "Unable to create silence detector :(\n");
         return -1;
      }
      ast_dsp_set_threshold(sildet, silencethreshold);
      rfmt = chan->readformat;
      res = ast_set_read_format(chan, AST_FORMAT_SLINEAR);
      if (res < 0) {
         ast_log(LOG_WARNING, "Unable to set to linear mode, giving up\n");
         ast_dsp_free(sildet);
         return -1;
      }
   }

   if (!prepend) {
      /* Request a video update */
      ast_indicate(chan, AST_CONTROL_VIDUPDATE);

      if (ast_opt_transmit_silence) {
         silgen = ast_channel_start_silence_generator(chan);
      }
   }

   if (x == fmtcnt) {
      /* Loop forever, writing the packets we read to the writer(s), until
         we read a digit or get a hangup */
      struct ast_frame *f;
      for (;;) {
         if (!(res = ast_waitfor(chan, 2000))) {
            ast_debug(1, "One waitfor failed, trying another\n");
            /* Try one more time in case of masq */
            if (!(res = ast_waitfor(chan, 2000))) {
               ast_log(LOG_WARNING, "No audio available on %s??\n", chan->name);
               res = -1;
            }
         }

         if (res < 0) {
            f = NULL;
            break;
         }
         if (!(f = ast_read(chan))) {
            break;
         }
         if (f->frametype == AST_FRAME_VOICE) {
            /* write each format */
            for (x = 0; x < fmtcnt; x++) {
               if (prepend && !others[x]) {
                  break;
               }
               res = ast_writestream(others[x], f);
            }

            /* Silence Detection */
            if (maxsilence > 0) {
               dspsilence = 0;
               ast_dsp_silence(sildet, f, &dspsilence);
               if (olddspsilence > dspsilence) {
                  totalsilence += olddspsilence;
               }
               olddspsilence = dspsilence;

               if (dspsilence > maxsilence) {
                  /* Ended happily with silence */
                  ast_verb(3, "Recording automatically stopped after a silence of %d seconds\n", dspsilence/1000);
                  res = 'S';
                  outmsg = 2;
                  break;
               }
            }
            /* Exit on any error */
            if (res) {
               ast_log(LOG_WARNING, "Error writing frame\n");
               break;
            }
         } else if (f->frametype == AST_FRAME_VIDEO) {
            /* Write only once */
            ast_writestream(others[0], f);
         } else if (f->frametype == AST_FRAME_DTMF) {
            if (prepend) {
            /* stop recording with any digit */
               ast_verb(3, "User ended message by pressing %c\n", f->subclass.integer);
               res = 't';
               outmsg = 2;
               break;
            }
            if (strchr(acceptdtmf, f->subclass.integer)) {
               ast_verb(3, "User ended message by pressing %c\n", f->subclass.integer);
               res = f->subclass.integer;
               outmsg = 2;
               break;
            }
            if (strchr(canceldtmf, f->subclass.integer)) {
               ast_verb(3, "User cancelled message by pressing %c\n", f->subclass.integer);
               res = f->subclass.integer;
               outmsg = 0;
               break;
            }
         }
         if (maxtime) {
            end = time(NULL);
            if (maxtime < (end - start)) {
               ast_verb(3, "Took too long, cutting it short...\n");
               res = 't';
               outmsg = 2;
               break;
            }
         }
         ast_frfree(f);
      }
      if (!f) {
         ast_verb(3, "User hung up\n");
         res = -1;
         outmsg = 1;
      } else {
         ast_frfree(f);
      }
   } else {
      ast_log(LOG_WARNING, "Error creating writestream '%s', format '%s'\n", recordfile, sfmt[x]);
   }

   if (!prepend) {
      if (silgen) {
         ast_channel_stop_silence_generator(chan, silgen);
      }
   }

   /*!\note
    * Instead of asking how much time passed (end - start), calculate the number
    * of seconds of audio which actually went into the file.  This fixes a
    * problem where audio is stopped up on the network and never gets to us.
    *
    * Note that we still want to use the number of seconds passed for the max
    * message, otherwise we could get a situation where this stream is never
    * closed (which would create a resource leak).
    */
   *duration = others[0] ? ast_tellstream(others[0]) / 8000 : 0;
   if (sound_duration) {
      *sound_duration = *duration;
   }

   if (!prepend) {
      /* Reduce duration by a total silence amount */
      if (olddspsilence <= dspsilence) {
         totalsilence += dspsilence;
      }

      if (sound_duration) {
         if (totalsilence > 0) {
            *sound_duration -= (totalsilence - 200) / 1000;
         }
         if (*sound_duration < 0) {
            *sound_duration = 0;
         }
      }

      if (dspsilence > 0) {
         *duration -= (dspsilence - 200) / 1000;
      }
      if (*duration < 0) {
         *duration = 0;
      }

      for (x = 0; x < fmtcnt; x++) {
         if (!others[x]) {
            break;
         }
         /*!\note
          * If we ended with silence, trim all but the first 200ms of silence
          * off the recording.  However, if we ended with '#', we don't want
          * to trim ANY part of the recording.
          */
         if (res > 0 && dspsilence) {
                                /* rewind only the trailing silence */
            ast_stream_rewind(others[x], dspsilence - 200);
         }
         ast_truncstream(others[x]);
         ast_closestream(others[x]);
      }
   }

   if (prepend && outmsg) {
      struct ast_filestream *realfiles[AST_MAX_FORMATS];
      struct ast_frame *fr;

      for (x = 0; x < fmtcnt; x++) {
         snprintf(comment, sizeof(comment), "Opening the real file %s.%s\n", recordfile, sfmt[x]);
         realfiles[x] = ast_readfile(recordfile, sfmt[x], comment, O_RDONLY, 0, 0);
         if (!others[x] || !realfiles[x]) {
            break;
         }
         /*!\note Same logic as above. */
         if (dspsilence) {
            ast_stream_rewind(others[x], dspsilence - 200);
         }
         ast_truncstream(others[x]);
         /* add the original file too */
         while ((fr = ast_readframe(realfiles[x]))) {
            ast_writestream(others[x], fr);
            ast_frfree(fr);
         }
         ast_closestream(others[x]);
         ast_closestream(realfiles[x]);
         ast_filerename(prependfile, recordfile, sfmt[x]);
         ast_verb(4, "Recording Format: sfmts=%s, prependfile %s, recordfile %s\n", sfmt[x], prependfile, recordfile);
         ast_filedelete(prependfile, sfmt[x]);
      }
   }
   if (rfmt && ast_set_read_format(chan, rfmt)) {
      ast_log(LOG_WARNING, "Unable to restore format %s to channel '%s'\n", ast_getformatname(rfmt), chan->name);
   }
   if ((outmsg == 2) && (!skip_confirmation_sound)) {
      ast_stream_and_wait(chan, "auth-thankyou", "");
   }
   if (sildet) {
      ast_dsp_free(sildet);
   }
   return res;
}

static const char default_acceptdtmf[] = "#";
static const char default_canceldtmf[] = "";

int ast_play_and_record_full(struct ast_channel *chan, const char *playfile, const char *recordfile, int maxtime, const char *fmt, int *duration, int *sound_duration, int silencethreshold, int maxsilence, const char *path, const char *acceptdtmf, const char *canceldtmf)
{
   return __ast_play_and_record(chan, playfile, recordfile, maxtime, fmt, duration, sound_duration, 0, silencethreshold, maxsilence, path, 0, S_OR(acceptdtmf, default_acceptdtmf), S_OR(canceldtmf, default_canceldtmf), 0);
}

int ast_play_and_record(struct ast_channel *chan, const char *playfile, const char *recordfile, int maxtime, const char *fmt, int *duration, int *sound_duration, int silencethreshold, int maxsilence, const char *path)
{
   return __ast_play_and_record(chan, playfile, recordfile, maxtime, fmt, duration, sound_duration, 0, silencethreshold, maxsilence, path, 0, default_acceptdtmf, default_canceldtmf, 0);
}

int ast_play_and_prepend(struct ast_channel *chan, char *playfile, char *recordfile, int maxtime, char *fmt, int *duration, int *sound_duration, int beep, int silencethreshold, int maxsilence)
{
   return __ast_play_and_record(chan, playfile, recordfile, maxtime, fmt, duration, sound_duration, beep, silencethreshold, maxsilence, NULL, 1, default_acceptdtmf, default_canceldtmf, 1);
}

/* Channel group core functions */

int ast_app_group_split_group(const char *data, char *group, int group_max, char *category, int category_max)
{
   int res = 0;
   char tmp[256];
   char *grp = NULL, *cat = NULL;

   if (!ast_strlen_zero(data)) {
      ast_copy_string(tmp, data, sizeof(tmp));
      grp = tmp;
      if ((cat = strchr(tmp, '@'))) {
         *cat++ = '\0';
      }
   }

   if (!ast_strlen_zero(grp)) {
      ast_copy_string(group, grp, group_max);
   } else {
      *group = '\0';
   }

   if (!ast_strlen_zero(cat)) {
      ast_copy_string(category, cat, category_max);
   }

   return res;
}

int ast_app_group_set_channel(struct ast_channel *chan, const char *data)
{
   int res = 0;
   char group[80] = "", category[80] = "";
   struct ast_group_info *gi = NULL;
   size_t len = 0;

   if (ast_app_group_split_group(data, group, sizeof(group), category, sizeof(category))) {
      return -1;
   }

   /* Calculate memory we will need if this is new */
   len = sizeof(*gi) + strlen(group) + 1;
   if (!ast_strlen_zero(category)) {
      len += strlen(category) + 1;
   }

   AST_RWLIST_WRLOCK(&groups);
   AST_RWLIST_TRAVERSE_SAFE_BEGIN(&groups, gi, group_list) {
      if ((gi->chan == chan) && ((ast_strlen_zero(category) && ast_strlen_zero(gi->category)) || (!ast_strlen_zero(gi->category) && !strcasecmp(gi->category, category)))) {
         AST_RWLIST_REMOVE_CURRENT(group_list);
         free(gi);
         break;
      }
   }
   AST_RWLIST_TRAVERSE_SAFE_END;

   if (ast_strlen_zero(group)) {
      /* Enable unsetting the group */
   } else if ((gi = calloc(1, len))) {
      gi->chan = chan;
      gi->group = (char *) gi + sizeof(*gi);
      strcpy(gi->group, group);
      if (!ast_strlen_zero(category)) {
         gi->category = (char *) gi + sizeof(*gi) + strlen(group) + 1;
         strcpy(gi->category, category);
      }
      AST_RWLIST_INSERT_TAIL(&groups, gi, group_list);
   } else {
      res = -1;
   }

   AST_RWLIST_UNLOCK(&groups);

   return res;
}

int ast_app_group_get_count(const char *group, const char *category)
{
   struct ast_group_info *gi = NULL;
   int count = 0;

   if (ast_strlen_zero(group)) {
      return 0;
   }

   AST_RWLIST_RDLOCK(&groups);
   AST_RWLIST_TRAVERSE(&groups, gi, group_list) {
      if (!strcasecmp(gi->group, group) && (ast_strlen_zero(category) || (!ast_strlen_zero(gi->category) && !strcasecmp(gi->category, category)))) {
         count++;
      }
   }
   AST_RWLIST_UNLOCK(&groups);

   return count;
}

int ast_app_group_match_get_count(const char *groupmatch, const char *category)
{
   struct ast_group_info *gi = NULL;
   regex_t regexbuf_group;
   regex_t regexbuf_category;
   int count = 0;

   if (ast_strlen_zero(groupmatch)) {
      ast_log(LOG_NOTICE, "groupmatch empty\n");
      return 0;
   }

   /* if regex compilation fails, return zero matches */
   if (regcomp(&regexbuf_group, groupmatch, REG_EXTENDED | REG_NOSUB)) {
      ast_log(LOG_ERROR, "Regex compile failed on: %s\n", groupmatch);
      return 0;
   }

   if (!ast_strlen_zero(category) && regcomp(&regexbuf_category, category, REG_EXTENDED | REG_NOSUB)) {
      ast_log(LOG_ERROR, "Regex compile failed on: %s\n", category);
      regfree(&regexbuf_group);
      return 0;
   }

   AST_RWLIST_RDLOCK(&groups);
   AST_RWLIST_TRAVERSE(&groups, gi, group_list) {
      if (!regexec(&regexbuf_group, gi->group, 0, NULL, 0) && (ast_strlen_zero(category) || (!ast_strlen_zero(gi->category) && !regexec(&regexbuf_category, gi->category, 0, NULL, 0)))) {
         count++;
      }
   }
   AST_RWLIST_UNLOCK(&groups);

   regfree(&regexbuf_group);
   if (!ast_strlen_zero(category)) {
      regfree(&regexbuf_category);
   }

   return count;
}

int ast_app_group_update(struct ast_channel *old, struct ast_channel *new)
{
   struct ast_group_info *gi = NULL;

   AST_RWLIST_WRLOCK(&groups);
   AST_RWLIST_TRAVERSE_SAFE_BEGIN(&groups, gi, group_list) {
      if (gi->chan == old) {
         gi->chan = new;
      } else if (gi->chan == new) {
         AST_RWLIST_REMOVE_CURRENT(group_list);
         ast_free(gi);
      }
   }
   AST_RWLIST_TRAVERSE_SAFE_END;
   AST_RWLIST_UNLOCK(&groups);

   return 0;
}

int ast_app_group_discard(struct ast_channel *chan)
{
   struct ast_group_info *gi = NULL;

   AST_RWLIST_WRLOCK(&groups);
   AST_RWLIST_TRAVERSE_SAFE_BEGIN(&groups, gi, group_list) {
      if (gi->chan == chan) {
         AST_RWLIST_REMOVE_CURRENT(group_list);
         ast_free(gi);
      }
   }
   AST_RWLIST_TRAVERSE_SAFE_END;
   AST_RWLIST_UNLOCK(&groups);

   return 0;
}

int ast_app_group_list_wrlock(void)
{
   return AST_RWLIST_WRLOCK(&groups);
}

int ast_app_group_list_rdlock(void)
{
   return AST_RWLIST_RDLOCK(&groups);
}

struct ast_group_info *ast_app_group_list_head(void)
{
   return AST_RWLIST_FIRST(&groups);
}

int ast_app_group_list_unlock(void)
{
   return AST_RWLIST_UNLOCK(&groups);
}

#undef ast_app_separate_args
unsigned int ast_app_separate_args(char *buf, char delim, char **array, int arraylen);

unsigned int __ast_app_separate_args(char *buf, char delim, int remove_chars, char **array, int arraylen)
{
   int argc;
   char *scan, *wasdelim = NULL;
   int paren = 0, quote = 0, bracket = 0;

   if (!array || !arraylen) {
      return 0;
   }

   memset(array, 0, arraylen * sizeof(*array));

   if (!buf) {
      return 0;
   }

   scan = buf;

   for (argc = 0; *scan && (argc < arraylen - 1); argc++) {
      array[argc] = scan;
      for (; *scan; scan++) {
         if (*scan == '(') {
            paren++;
         } else if (*scan == ')') {
            if (paren) {
               paren--;
            }
         } else if (*scan == '[') {
            bracket++;
         } else if (*scan == ']') {
            if (bracket) {
               bracket--;
            }
         } else if (*scan == '"' && delim != '"') {
            quote = quote ? 0 : 1;
            if (remove_chars) {
               /* Remove quote character from argument */
               memmove(scan, scan + 1, strlen(scan));
               scan--;
            }
         } else if (*scan == '\\') {
            if (remove_chars) {
               /* Literal character, don't parse */
               memmove(scan, scan + 1, strlen(scan));
            } else {
               scan++;
            }
         } else if ((*scan == delim) && !paren && !quote && !bracket) {
            wasdelim = scan;
            *scan++ = '\0';
            break;
         }
      }
   }

   /* If the last character in the original string was the delimiter, then
    * there is one additional argument. */
   if (*scan || (scan > buf && (scan - 1) == wasdelim)) {
      array[argc++] = scan;
   }

   return argc;
}

/* ABI compatible function */
unsigned int ast_app_separate_args(char *buf, char delim, char **array, int arraylen)
{
   return __ast_app_separate_args(buf, delim, 1, array, arraylen);
}

static enum AST_LOCK_RESULT ast_lock_path_lockfile(const char *path)
{
   char *s;
   char *fs;
   int res;
   int fd;
   int lp = strlen(path);
   time_t start;

   s = ast_alloca(lp + 10);
   fs = ast_alloca(lp + 20);

   snprintf(fs, strlen(path) + 19, "%s/.lock-%08lx", path, (unsigned long)ast_random());
   fd = open(fs, O_WRONLY | O_CREAT | O_EXCL, AST_FILE_MODE);
   if (fd < 0) {
      ast_log(LOG_ERROR, "Unable to create lock file '%s': %s\n", path, strerror(errno));
      return AST_LOCK_PATH_NOT_FOUND;
   }
   close(fd);

   snprintf(s, strlen(path) + 9, "%s/.lock", path);
   start = time(NULL);
   while (((res = link(fs, s)) < 0) && (errno == EEXIST) && (time(NULL) - start < 5)) {
      sched_yield();
   }

   unlink(fs);

   if (res) {
      ast_log(LOG_WARNING, "Failed to lock path '%s': %s\n", path, strerror(errno));
      return AST_LOCK_TIMEOUT;
   } else {
      ast_debug(1, "Locked path '%s'\n", path);
      return AST_LOCK_SUCCESS;
   }
}

static int ast_unlock_path_lockfile(const char *path)
{
   char *s;
   int res;

   s = ast_alloca(strlen(path) + 10);

   snprintf(s, strlen(path) + 9, "%s/%s", path, ".lock");

   if ((res = unlink(s))) {
      ast_log(LOG_ERROR, "Could not unlock path '%s': %s\n", path, strerror(errno));
   } else {
      ast_debug(1, "Unlocked path '%s'\n", path);
   }

   return res;
}

struct path_lock {
   AST_LIST_ENTRY(path_lock) le;
   int fd;
   char *path;
};

static AST_LIST_HEAD_STATIC(path_lock_list, path_lock);

static void path_lock_destroy(struct path_lock *obj)
{
   if (obj->fd >= 0) {
      close(obj->fd);
   }
   if (obj->path) {
      free(obj->path);
   }
   free(obj);
}

static enum AST_LOCK_RESULT ast_lock_path_flock(const char *path)
{
   char *fs;
   int res;
   int fd;
   time_t start;
   struct path_lock *pl;
   struct stat st, ost;

   fs = ast_alloca(strlen(path) + 20);

   snprintf(fs, strlen(path) + 19, "%s/lock", path);
   if (lstat(fs, &st) == 0) {
      if ((st.st_mode & S_IFMT) == S_IFLNK) {
         ast_log(LOG_WARNING, "Unable to create lock file "
               "'%s': it's already a symbolic link\n",
               fs);
         return AST_LOCK_FAILURE;
      }
      if (st.st_nlink > 1) {
         ast_log(LOG_WARNING, "Unable to create lock file "
               "'%s': %u hard links exist\n",
               fs, (unsigned int) st.st_nlink);
         return AST_LOCK_FAILURE;
      }
   }
   if ((fd = open(fs, O_WRONLY | O_CREAT, 0600)) < 0) {
      ast_log(LOG_WARNING, "Unable to create lock file '%s': %s\n",
            fs, strerror(errno));
      return AST_LOCK_PATH_NOT_FOUND;
   }
   if (!(pl = ast_calloc(1, sizeof(*pl)))) {
      /* We don't unlink the lock file here, on the possibility that
       * someone else created it - better to leave a little mess
       * than create a big one by destroying someone else's lock
       * and causing something to be corrupted.
       */
      close(fd);
      return AST_LOCK_FAILURE;
   }
   pl->fd = fd;
   pl->path = strdup(path);

   time(&start);
   while (
      #ifdef SOLARIS
      ((res = fcntl(pl->fd, F_SETLK, fcntl(pl->fd, F_GETFL) | O_NONBLOCK)) < 0) &&
      #else
      ((res = flock(pl->fd, LOCK_EX | LOCK_NB)) < 0) &&
      #endif
         (errno == EWOULDBLOCK) &&
         (time(NULL) - start < 5))
      usleep(1000);
   if (res) {
      ast_log(LOG_WARNING, "Failed to lock path '%s': %s\n",
            path, strerror(errno));
      /* No unlinking of lock done, since we tried and failed to
       * flock() it.
       */
      path_lock_destroy(pl);
      return AST_LOCK_TIMEOUT;
   }

   /* Check for the race where the file is recreated or deleted out from
    * underneath us.
    */
   if (lstat(fs, &st) != 0 && fstat(pl->fd, &ost) != 0 &&
         st.st_dev != ost.st_dev &&
         st.st_ino != ost.st_ino) {
      ast_log(LOG_WARNING, "Unable to create lock file '%s': "
            "file changed underneath us\n", fs);
      path_lock_destroy(pl);
      return AST_LOCK_FAILURE;
   }

   /* Success: file created, flocked, and is the one we started with */
   AST_LIST_LOCK(&path_lock_list);
   AST_LIST_INSERT_TAIL(&path_lock_list, pl, le);
   AST_LIST_UNLOCK(&path_lock_list);

   ast_debug(1, "Locked path '%s'\n", path);

   return AST_LOCK_SUCCESS;
}

static int ast_unlock_path_flock(const char *path)
{
   char *s;
   struct path_lock *p;

   s = ast_alloca(strlen(path) + 20);

   AST_LIST_LOCK(&path_lock_list);
   AST_LIST_TRAVERSE_SAFE_BEGIN(&path_lock_list, p, le) {
      if (!strcmp(p->path, path)) {
         AST_LIST_REMOVE_CURRENT(le);
         break;
      }
   }
   AST_LIST_TRAVERSE_SAFE_END;
   AST_LIST_UNLOCK(&path_lock_list);

   if (p) {
      snprintf(s, strlen(path) + 19, "%s/lock", path);
      unlink(s);
      path_lock_destroy(p);
      ast_log(LOG_DEBUG, "Unlocked path '%s'\n", path);
   } else {
      ast_log(LOG_DEBUG, "Failed to unlock path '%s': "
            "lock not found\n", path);
   }

   return 0;
}

void ast_set_lock_type(enum AST_LOCK_TYPE type)
{
   ast_lock_type = type;
}

enum AST_LOCK_RESULT ast_lock_path(const char *path)
{
   enum AST_LOCK_RESULT r = AST_LOCK_FAILURE;

   switch (ast_lock_type) {
   case AST_LOCK_TYPE_LOCKFILE:
      r = ast_lock_path_lockfile(path);
      break;
   case AST_LOCK_TYPE_FLOCK:
      r = ast_lock_path_flock(path);
      break;
   }

   return r;
}

int ast_unlock_path(const char *path)
{
   int r = 0;

   switch (ast_lock_type) {
   case AST_LOCK_TYPE_LOCKFILE:
      r = ast_unlock_path_lockfile(path);
      break;
   case AST_LOCK_TYPE_FLOCK:
      r = ast_unlock_path_flock(path);
      break;
   }

   return r;
}

int ast_record_review(struct ast_channel *chan, const char *playfile, const char *recordfile, int maxtime, const char *fmt, int *duration, const char *path) 
{
   int silencethreshold;
   int maxsilence = 0;
   int res = 0;
   int cmd = 0;
   int max_attempts = 3;
   int attempts = 0;
   int recorded = 0;
   int message_exists = 0;
   /* Note that urgent and private are for flagging messages as such in the future */

   /* barf if no pointer passed to store duration in */
   if (!duration) {
      ast_log(LOG_WARNING, "Error ast_record_review called without duration pointer\n");
      return -1;
   }

   cmd = '3';   /* Want to start by recording */

   silencethreshold = ast_dsp_get_threshold_from_settings(THRESHOLD_SILENCE);

   while ((cmd >= 0) && (cmd != 't')) {
      switch (cmd) {
      case '1':
         if (!message_exists) {
            /* In this case, 1 is to record a message */
            cmd = '3';
            break;
         } else {
            ast_stream_and_wait(chan, "vm-msgsaved", "");
            cmd = 't';
            return res;
         }
      case '2':
         /* Review */
         ast_verb(3, "Reviewing the recording\n");
         cmd = ast_stream_and_wait(chan, recordfile, AST_DIGIT_ANY);
         break;
      case '3':
         message_exists = 0;
         /* Record */
         ast_verb(3, "R%secording\n", recorded == 1 ? "e-r" : "");
         recorded = 1;
         if ((cmd = ast_play_and_record(chan, playfile, recordfile, maxtime, fmt, duration, NULL, silencethreshold, maxsilence, path)) == -1) {
            /* User has hung up, no options to give */
            return cmd;
         }
         if (cmd == '0') {
            break;
         } else if (cmd == '*') {
            break;
         } else {
            /* If all is well, a message exists */
            message_exists = 1;
            cmd = 0;
         }
         break;
      case '4':
      case '5':
      case '6':
      case '7':
      case '8':
      case '9':
      case '*':
      case '#':
         cmd = ast_play_and_wait(chan, "vm-sorry");
         break;
      default:
         if (message_exists) {
            cmd = ast_play_and_wait(chan, "vm-review");
         } else {
            if (!(cmd = ast_play_and_wait(chan, "vm-torerecord"))) {
               cmd = ast_waitfordigit(chan, 600);
            }
         }

         if (!cmd) {
            cmd = ast_waitfordigit(chan, 6000);
         }
         if (!cmd) {
            attempts++;
         }
         if (attempts > max_attempts) {
            cmd = 't';
         }
      }
   }
   if (cmd == 't') {
      cmd = 0;
   }
   return cmd;
}

#define RES_UPONE (1 << 16)
#define RES_EXIT  (1 << 17)
#define RES_REPEAT (1 << 18)
#define RES_RESTART ((1 << 19) | RES_REPEAT)

static int ast_ivr_menu_run_internal(struct ast_channel *chan, struct ast_ivr_menu *menu, void *cbdata);

static int ivr_dispatch(struct ast_channel *chan, struct ast_ivr_option *option, char *exten, void *cbdata)
{
   int res;
   int (*ivr_func)(struct ast_channel *, void *);
   char *c;
   char *n;

   switch (option->action) {
   case AST_ACTION_UPONE:
      return RES_UPONE;
   case AST_ACTION_EXIT:
      return RES_EXIT | (((unsigned long)(option->adata)) & 0xffff);
   case AST_ACTION_REPEAT:
      return RES_REPEAT | (((unsigned long)(option->adata)) & 0xffff);
   case AST_ACTION_RESTART:
      return RES_RESTART ;
   case AST_ACTION_NOOP:
      return 0;
   case AST_ACTION_BACKGROUND:
      res = ast_stream_and_wait(chan, (char *)option->adata, AST_DIGIT_ANY);
      if (res < 0) {
         ast_log(LOG_NOTICE, "Unable to find file '%s'!\n", (char *)option->adata);
         res = 0;
      }
      return res;
   case AST_ACTION_PLAYBACK:
      res = ast_stream_and_wait(chan, (char *)option->adata, "");
      if (res < 0) {
         ast_log(LOG_NOTICE, "Unable to find file '%s'!\n", (char *)option->adata);
         res = 0;
      }
      return res;
   case AST_ACTION_MENU:
      if ((res = ast_ivr_menu_run_internal(chan, (struct ast_ivr_menu *)option->adata, cbdata)) == -2) {
         /* Do not pass entry errors back up, treat as though it was an "UPONE" */
         res = 0;
      }
      return res;
   case AST_ACTION_WAITOPTION:
      if (!(res = ast_waitfordigit(chan, chan->pbx ? chan->pbx->rtimeoutms : 10000))) {
         return 't';
      }
      return res;
   case AST_ACTION_CALLBACK:
      ivr_func = option->adata;
      res = ivr_func(chan, cbdata);
      return res;
   case AST_ACTION_TRANSFER:
      res = ast_parseable_goto(chan, option->adata);
      return 0;
   case AST_ACTION_PLAYLIST:
   case AST_ACTION_BACKLIST:
      res = 0;
      c = ast_strdupa(option->adata);
      while ((n = strsep(&c, ";"))) {
         if ((res = ast_stream_and_wait(chan, n,
               (option->action == AST_ACTION_BACKLIST) ? AST_DIGIT_ANY : ""))) {
            break;
         }
      }
      ast_stopstream(chan);
      return res;
   default:
      ast_log(LOG_NOTICE, "Unknown dispatch function %u, ignoring!\n", option->action);
      return 0;
   }
   return -1;
}

static int option_exists(struct ast_ivr_menu *menu, char *option)
{
   int x;
   for (x = 0; menu->options[x].option; x++) {
      if (!strcasecmp(menu->options[x].option, option)) {
         return x;
      }
   }
   return -1;
}

static int option_matchmore(struct ast_ivr_menu *menu, char *option)
{
   int x;
   for (x = 0; menu->options[x].option; x++) {
      if ((!strncasecmp(menu->options[x].option, option, strlen(option))) &&
            (menu->options[x].option[strlen(option)])) {
         return x;
      }
   }
   return -1;
}

static int read_newoption(struct ast_channel *chan, struct ast_ivr_menu *menu, char *exten, int maxexten)
{
   int res = 0;
   int ms;
   while (option_matchmore(menu, exten)) {
      ms = chan->pbx ? chan->pbx->dtimeoutms : 5000;
      if (strlen(exten) >= maxexten - 1) {
         break;
      }
      if ((res = ast_waitfordigit(chan, ms)) < 1) {
         break;
      }
      exten[strlen(exten) + 1] = '\0';
      exten[strlen(exten)] = res;
   }
   return res > 0 ? 0 : res;
}

static int ast_ivr_menu_run_internal(struct ast_channel *chan, struct ast_ivr_menu *menu, void *cbdata)
{
   /* Execute an IVR menu structure */
   int res = 0;
   int pos = 0;
   int retries = 0;
   char exten[AST_MAX_EXTENSION] = "s";
   if (option_exists(menu, "s") < 0) {
      strcpy(exten, "g");
      if (option_exists(menu, "g") < 0) {
         ast_log(LOG_WARNING, "No 's' nor 'g' extension in menu '%s'!\n", menu->title);
         return -1;
      }
   }
   while (!res) {
      while (menu->options[pos].option) {
         if (!strcasecmp(menu->options[pos].option, exten)) {
            res = ivr_dispatch(chan, menu->options + pos, exten, cbdata);
            ast_debug(1, "IVR Dispatch of '%s' (pos %d) yields %d\n", exten, pos, res);
            if (res < 0) {
               break;
            } else if (res & RES_UPONE) {
               return 0;
            } else if (res & RES_EXIT) {
               return res;
            } else if (res & RES_REPEAT) {
               int maxretries = res & 0xffff;
               if ((res & RES_RESTART) == RES_RESTART) {
                  retries = 0;
               } else {
                  retries++;
               }
               if (!maxretries) {
                  maxretries = 3;
               }
               if ((maxretries > 0) && (retries >= maxretries)) {
                  ast_debug(1, "Max retries %d exceeded\n", maxretries);
                  return -2;
               } else {
                  if (option_exists(menu, "g") > -1) {
                     strcpy(exten, "g");
                  } else if (option_exists(menu, "s") > -1) {
                     strcpy(exten, "s");
                  }
               }
               pos = 0;
               continue;
            } else if (res && strchr(AST_DIGIT_ANY, res)) {
               ast_debug(1, "Got start of extension, %c\n", res);
               exten[1] = '\0';
               exten[0] = res;
               if ((res = read_newoption(chan, menu, exten, sizeof(exten)))) {
                  break;
               }
               if (option_exists(menu, exten) < 0) {
                  if (option_exists(menu, "i")) {
                     ast_debug(1, "Invalid extension entered, going to 'i'!\n");
                     strcpy(exten, "i");
                     pos = 0;
                     continue;
                  } else {
                     ast_debug(1, "Aborting on invalid entry, with no 'i' option!\n");
                     res = -2;
                     break;
                  }
               } else {
                  ast_debug(1, "New existing extension: %s\n", exten);
                  pos = 0;
                  continue;
               }
            }
         }
         pos++;
      }
      ast_debug(1, "Stopping option '%s', res is %d\n", exten, res);
      pos = 0;
      if (!strcasecmp(exten, "s")) {
         strcpy(exten, "g");
      } else {
         break;
      }
   }
   return res;
}

int ast_ivr_menu_run(struct ast_channel *chan, struct ast_ivr_menu *menu, void *cbdata)
{
   int res = ast_ivr_menu_run_internal(chan, menu, cbdata);
   /* Hide internal coding */
   return res > 0 ? 0 : res;
}

char *ast_read_textfile(const char *filename)
{
   int fd, count = 0, res;
   char *output = NULL;
   struct stat filesize;

   if (stat(filename, &filesize) == -1) {
      ast_log(LOG_WARNING, "Error can't stat %s\n", filename);
      return NULL;
   }

   count = filesize.st_size + 1;

   if ((fd = open(filename, O_RDONLY)) < 0) {
      ast_log(LOG_WARNING, "Cannot open file '%s' for reading: %s\n", filename, strerror(errno));
      return NULL;
   }

   if ((output = ast_malloc(count))) {
      res = read(fd, output, count - 1);
      if (res == count - 1) {
         output[res] = '\0';
      } else {
         ast_log(LOG_WARNING, "Short read of %s (%d of %d): %s\n", filename, res, count - 1, strerror(errno));
         ast_free(output);
         output = NULL;
      }
   }

   close(fd);

   return output;
}

static int parse_options(const struct ast_app_option *options, void *_flags, char **args, char *optstr, int flaglen)
{
   char *s, *arg;
   int curarg, res = 0;
   unsigned int argloc;
   struct ast_flags *flags = _flags;
   struct ast_flags64 *flags64 = _flags;

   if (flaglen == 32) {
      ast_clear_flag(flags, AST_FLAGS_ALL);
   } else {
      flags64->flags = 0;
   }

   if (!optstr) {
      return 0;
   }

   s = optstr;
   while (*s) {
      curarg = *s++ & 0x7f;   /* the array (in app.h) has 128 entries */
      argloc = options[curarg].arg_index;
      if (*s == '(') {
         int paren = 1, quote = 0;
         int parsequotes = (s[1] == '"') ? 1 : 0;

         /* Has argument */
         arg = ++s;
         for (; *s; s++) {
            if (*s == '(' && !quote) {
               paren++;
            } else if (*s == ')' && !quote) {
               /* Count parentheses, unless they're within quotes (or backslashed, below) */
               paren--;
            } else if (*s == '"' && parsequotes) {
               /* Leave embedded quotes alone, unless they are the first character */
               quote = quote ? 0 : 1;
               ast_copy_string(s, s + 1, INT_MAX);
               s--;
            } else if (*s == '\\') {
               if (!quote) {
                  /* If a backslash is found outside of quotes, remove it */
                  ast_copy_string(s, s + 1, INT_MAX);
               } else if (quote && s[1] == '"') {
                  /* Backslash for a quote character within quotes, remove the backslash */
                  ast_copy_string(s, s + 1, INT_MAX);
               } else {
                  /* Backslash within quotes, keep both characters */
                  s++;
               }
            }

            if (paren == 0) {
               break;
            }
         }
         /* This will find the closing paren we found above, or none, if the string ended before we found one. */
         if ((s = strchr(s, ')'))) {
            if (argloc) {
               args[argloc - 1] = arg;
            }
            *s++ = '\0';
         } else {
            ast_log(LOG_WARNING, "Missing closing parenthesis for argument '%c' in string '%s'\n", curarg, arg);
            res = -1;
            break;
         }
      } else if (argloc) {
         args[argloc - 1] = "";
      }
      if (flaglen == 32) {
         ast_set_flag(flags, options[curarg].flag);
      } else {
         ast_set_flag64(flags64, options[curarg].flag);
      }
   }

   return res;
}

int ast_app_parse_options(const struct ast_app_option *options, struct ast_flags *flags, char **args, char *optstr)
{
   return parse_options(options, flags, args, optstr, 32);
}

int ast_app_parse_options64(const struct ast_app_option *options, struct ast_flags64 *flags, char **args, char *optstr)
{
   return parse_options(options, flags, args, optstr, 64);
}

void ast_app_options2str64(const struct ast_app_option *options, struct ast_flags64 *flags, char *buf, size_t len)
{
   unsigned int i, found = 0;
   for (i = 32; i < 128 && found < len; i++) {
      if (ast_test_flag64(flags, options[i].flag)) {
         buf[found++] = i;
      }
   }
   buf[found] = '\0';
}

int ast_get_encoded_char(const char *stream, char *result, size_t *consumed)
{
   int i;
   *consumed = 1;
   *result = 0;
   if (ast_strlen_zero(stream)) {
      *consumed = 0;
      return -1;
   }

   if (*stream == '\\') {
      *consumed = 2;
      switch (*(stream + 1)) {
      case 'n':
         *result = '\n';
         break;
      case 'r':
         *result = '\r';
         break;
      case 't':
         *result = '\t';
         break;
      case 'x':
         /* Hexadecimal */
         if (strchr("0123456789ABCDEFabcdef", *(stream + 2)) && *(stream + 2) != '\0') {
            *consumed = 3;
            if (*(stream + 2) <= '9') {
               *result = *(stream + 2) - '0';
            } else if (*(stream + 2) <= 'F') {
               *result = *(stream + 2) - 'A' + 10;
            } else {
               *result = *(stream + 2) - 'a' + 10;
            }
         } else {
            ast_log(LOG_ERROR, "Illegal character '%c' in hexadecimal string\n", *(stream + 2));
            return -1;
         }

         if (strchr("0123456789ABCDEFabcdef", *(stream + 3)) && *(stream + 3) != '\0') {
            *consumed = 4;
            *result <<= 4;
            if (*(stream + 3) <= '9') {
               *result += *(stream + 3) - '0';
            } else if (*(stream + 3) <= 'F') {
               *result += *(stream + 3) - 'A' + 10;
            } else {
               *result += *(stream + 3) - 'a' + 10;
            }
         }
         break;
      case '0':
         /* Octal */
         *consumed = 2;
         for (i = 2; ; i++) {
            if (strchr("01234567", *(stream + i)) && *(stream + i) != '\0') {
               (*consumed)++;
               ast_debug(5, "result was %d, ", *result);
               *result <<= 3;
               *result += *(stream + i) - '0';
               ast_debug(5, "is now %d\n", *result);
            } else {
               break;
            }
         }
         break;
      default:
         *result = *(stream + 1);
      }
   } else {
      *result = *stream;
      *consumed = 1;
   }
   return 0;
}

char *ast_get_encoded_str(const char *stream, char *result, size_t result_size)
{
   char *cur = result;
   size_t consumed;

   while (cur < result + result_size - 1 && !ast_get_encoded_char(stream, cur, &consumed)) {
      cur++;
      stream += consumed;
   }
   *cur = '\0';
   return result;
}

int ast_str_get_encoded_str(struct ast_str **str, int maxlen, const char *stream)
{
   char next, *buf;
   size_t offset = 0;
   size_t consumed;

   if (strchr(stream, '\\')) {
      while (!ast_get_encoded_char(stream, &next, &consumed)) {
         if (offset + 2 > ast_str_size(*str) && maxlen > -1) {
            ast_str_make_space(str, maxlen > 0 ? maxlen : (ast_str_size(*str) + 48) * 2 - 48);
         }
         if (offset + 2 > ast_str_size(*str)) {
            break;
         }
         buf = ast_str_buffer(*str);
         buf[offset++] = next;
         stream += consumed;
      }
      buf = ast_str_buffer(*str);
      buf[offset++] = '\0';
      ast_str_update(*str);
   } else {
      ast_str_set(str, maxlen, "%s", stream);
   }
   return 0;
}

void ast_close_fds_above_n(int n)
{
   closefrom(n + 1);
}

int ast_safe_fork(int stop_reaper)
{
   sigset_t signal_set, old_set;
   int pid;

   /* Don't let the default signal handler for children reap our status */
   if (stop_reaper) {
      ast_replace_sigchld();
   }

   sigfillset(&signal_set);
   pthread_sigmask(SIG_BLOCK, &signal_set, &old_set);

   pid = fork();

   if (pid != 0) {
      /* Fork failed or parent */
      pthread_sigmask(SIG_SETMASK, &old_set, NULL);
      if (!stop_reaper && pid > 0) {
         struct zombie *cur = ast_calloc(1, sizeof(*cur));
         if (cur) {
            cur->pid = pid;
            AST_LIST_LOCK(&zombies);
            AST_LIST_INSERT_TAIL(&zombies, cur, list);
            AST_LIST_UNLOCK(&zombies);
            if (shaun_of_the_dead_thread == AST_PTHREADT_NULL) {
               if (ast_pthread_create_background(&shaun_of_the_dead_thread, NULL, shaun_of_the_dead, NULL)) {
                  ast_log(LOG_ERROR, "Shaun of the Dead wants to kill zombies, but can't?!!\n");
                  shaun_of_the_dead_thread = AST_PTHREADT_NULL;
               }
            }
         }
      }
      return pid;
   } else {
      /* Child */
#ifdef HAVE_CAP
      cap_t cap = cap_from_text("cap_net_admin-eip");

      if (cap_set_proc(cap)) {
         ast_log(LOG_WARNING, "Unable to remove capabilities.\n");
      }
      cap_free(cap);
#endif

      /* Before we unblock our signals, return our trapped signals back to the defaults */
      signal(SIGHUP, SIG_DFL);
      signal(SIGCHLD, SIG_DFL);
      signal(SIGINT, SIG_DFL);
      signal(SIGURG, SIG_DFL);
      signal(SIGTERM, SIG_DFL);
      signal(SIGPIPE, SIG_DFL);
      signal(SIGXFSZ, SIG_DFL);

      /* unblock important signal handlers */
      if (pthread_sigmask(SIG_UNBLOCK, &signal_set, NULL)) {
         ast_log(LOG_WARNING, "unable to unblock signals: %s\n", strerror(errno));
         _exit(1);
      }

      return pid;
   }
}

void ast_safe_fork_cleanup(void)
{
   ast_unreplace_sigchld();
}

int ast_app_parse_timelen(const char *timestr, int *result, enum ast_timelen unit)
{
   int res;
   char u[10];
#ifdef HAVE_LONG_DOUBLE_WIDER
   long double amount;
   #define FMT "%30Lf%9s"
#else
   double amount;
   #define FMT "%30lf%9s"
#endif
   if (!timestr) {
      return -1;
   }

   res = sscanf(timestr, FMT, &amount, u);

   if (res == 0 || res == EOF) {
#undef FMT
      return -1;
   } else if (res == 2) {
      switch (u[0]) {
      case 'h':
      case 'H':
         unit = TIMELEN_HOURS;
         break;
      case 's':
      case 'S':
         unit = TIMELEN_SECONDS;
         break;
      case 'm':
      case 'M':
         if (toupper(u[1]) == 'S') {
            unit = TIMELEN_MILLISECONDS;
         } else if (u[1] == '\0') {
            unit = TIMELEN_MINUTES;
         }
         break;
      }
   }

   switch (unit) {
   case TIMELEN_HOURS:
      amount *= 60;
      /* fall-through */
   case TIMELEN_MINUTES:
      amount *= 60;
      /* fall-through */
   case TIMELEN_SECONDS:
      amount *= 1000;
      /* fall-through */
   case TIMELEN_MILLISECONDS:
      ;
   }
   *result = amount > INT_MAX ? INT_MAX : (int) amount;
   return 0;
}