pbx.c

		if (!chan) {
			free(as);
			return -1;
		}
		pbx_builtin_setaccount(chan, account);
		as->chan = chan;
		strncpy(as->app, app, sizeof(as->app) - 1);
		if (appdata)
			strncpy(as->appdata,  appdata, sizeof(as->appdata) - 1);
		as->timeout = timeout;
		if (pthread_create(&as->p, NULL, async_wait, as)) {
			ast_log(LOG_WARNING, "Failed to start async wait\n");
			free(as);
			ast_hangup(chan);
			return -1;
		}
		res = 0;
	}
	return res;
}

static void destroy_exten(struct ast_exten *e)
{
	if (e->priority == PRIORITY_HINT)
		ast_remove_hint(e);

	if (e->datad)
		e->datad(e->data);
	free(e);
}

void __ast_context_destroy(struct ast_context *con, char *registrar, int lock)
{
	struct ast_context *tmp, *tmpl=NULL;
	struct ast_include *tmpi, *tmpil= NULL;
	struct ast_sw *sw, *swl= NULL;
	struct ast_exten *e, *el, *en;
	if (lock)
		ast_mutex_lock(&conlock);
	tmp = contexts;
	while(tmp) {
		if (((tmp->name && con && con->name && !strcasecmp(tmp->name, con->name)) || !con) &&
		    (!registrar || !strcasecmp(registrar, tmp->registrar))) {
			/* Okay, let's lock the structure to be sure nobody else
			   is searching through it. */
			if (ast_mutex_lock(&tmp->lock)) {
				ast_log(LOG_WARNING, "Unable to lock context lock\n");
				return;
			}
			if (tmpl)
				tmpl->next = tmp->next;
			else
				contexts = tmp->next;
			/* Okay, now we're safe to let it go -- in a sense, we were
			   ready to let it go as soon as we locked it. */
			ast_mutex_unlock(&tmp->lock);
			for (tmpi = tmp->includes; tmpi; ) {
				/* Free includes */
				tmpil = tmpi;
				tmpi = tmpi->next;
				free(tmpil);
				tmpil = tmpi;
			}
			for (sw = tmp->alts; sw; ) {
				swl = sw;
				sw = sw->next;
				free(swl);
				swl = sw;
			}
			for (e = tmp->root; e;) {
				for (en = e->peer; en;) {
					el = en;
					en = en->peer;
					destroy_exten(el);
				}
				el = e;
				e = e->next;
				destroy_exten(el);
			}
			free(tmp);
			if (!con) {
				/* Might need to get another one -- restart */
				tmp = contexts;
				tmpl = NULL;
				tmpil = NULL;
				continue;
			}
			if (lock)
				ast_mutex_unlock(&conlock);
			return;
		}
		tmpl = tmp;
		tmp = tmp->next;
	}
	if (lock)
		ast_mutex_unlock(&conlock);
}

void ast_context_destroy(struct ast_context *con, char *registrar)
{
	__ast_context_destroy(con,registrar,1);
}

static void wait_for_hangup(struct ast_channel *chan)
{
	int res;
	struct ast_frame *f;
	do {
		res = ast_waitfor(chan, -1);
		if (res < 0)
			return;
		f = ast_read(chan);
		if (f)
			ast_frfree(f);
	} while(f);
}

static int pbx_builtin_ringing(struct ast_channel *chan, void *data)
{
	ast_indicate(chan, AST_CONTROL_RINGING);
	return 0;
}

static int pbx_builtin_busy(struct ast_channel *chan, void *data)
{
	ast_indicate(chan, AST_CONTROL_BUSY);		
	wait_for_hangup(chan);
	return -1;
}

static int pbx_builtin_congestion(struct ast_channel *chan, void *data)
{
	ast_indicate(chan, AST_CONTROL_CONGESTION);
	wait_for_hangup(chan);
	return -1;
}

static int pbx_builtin_answer(struct ast_channel *chan, void *data)
{
	return ast_answer(chan);
}

static int pbx_builtin_setlanguage(struct ast_channel *chan, void *data)
{
	/* Copy the language as specified */
	strncpy(chan->language, (char *)data, sizeof(chan->language)-1);
	return 0;
}

static int pbx_builtin_resetcdr(struct ast_channel *chan, void *data)
{
	/* Reset the CDR as specified */
	if (data)
		ast_cdr_reset(chan->cdr, strchr((char *)data, 'w') ? 1 : 0);
	else
		ast_cdr_reset(chan->cdr, 0);
	return 0;
}

static int pbx_builtin_setaccount(struct ast_channel *chan, void *data)
{
	/* Copy the language as specified */
	if (data)
		ast_cdr_setaccount(chan, (char *)data);
	else
		ast_cdr_setaccount(chan, "");
	return 0;
}

static int pbx_builtin_hangup(struct ast_channel *chan, void *data)
{
	/* Just return non-zero and it will hang up */
	return -1;
}

static int pbx_builtin_stripmsd(struct ast_channel *chan, void *data)
{
	char newexten[AST_MAX_EXTENSION] = "";
	if (!data || !atoi(data)) {
		ast_log(LOG_DEBUG, "Ignoring, since number of digits to strip is 0\n");
		return 0;
	}
	if (strlen(chan->exten) > atoi(data)) {
		strncpy(newexten, chan->exten + atoi(data), sizeof(newexten)-1);
	}
	strncpy(chan->exten, newexten, sizeof(chan->exten)-1);
	return 0;
}

static int pbx_builtin_prefix(struct ast_channel *chan, void *data)
{
	char newexten[AST_MAX_EXTENSION] = "";
	if (!data || !strlen(data)) {
		ast_log(LOG_DEBUG, "Ignoring, since there is no prefix to add\n");
		return 0;
	}
	snprintf(newexten, sizeof(newexten), "%s%s", (char *)data, chan->exten);
	strncpy(chan->exten, newexten, sizeof(chan->exten)-1);
	if (option_verbose > 2)
		ast_verbose(VERBOSE_PREFIX_3 "Prepended prefix, new extension is %s\n", chan->exten);
	return 0;
}

static int pbx_builtin_suffix(struct ast_channel *chan, void *data)
{
	char newexten[AST_MAX_EXTENSION] = "";
	if (!data || !strlen(data)) {
		ast_log(LOG_DEBUG, "Ignoring, since there is no suffix to add\n");
		return 0;
	}
	snprintf(newexten, sizeof(newexten), "%s%s", chan->exten, (char *)data);
	strncpy(chan->exten, newexten, sizeof(chan->exten)-1);
	if (option_verbose > 2)
		ast_verbose(VERBOSE_PREFIX_3 "Appended suffix, new extension is %s\n", chan->exten);
	return 0;
}

static int pbx_builtin_gotoiftime(struct ast_channel *chan, void *data)
{
	int res=0;
	char *s, *ts;
	struct ast_include include;

	if (!data) {
		ast_log(LOG_WARNING, "GotoIfTime requires an argument:\n  <time range>|<days of week>|<days of month>|<months>?[[context|]extension|]priority\n");
		return -1;
	}

	s = strdup((char *) data);
	ts = s;

	/* Separate the Goto path */
	strsep(&ts,"?");

	// [PHM 07/01/03]
	// struct ast_include include contained garbage here, fixed by zeroing it on get_timerange
	build_timing(&include, s);
	if (include_valid(&include))
		res = pbx_builtin_goto(chan, (void *)ts);
	free(s);
	return res;
}

static int pbx_builtin_wait(struct ast_channel *chan, void *data)
{
	int ms;
	/* Wait for "n" seconds */
	if (data && atoi((char *)data)) {
		ms = atoi((char *)data) * 1000;
		return ast_safe_sleep(chan, ms);
	}
	return 0;
}

static int pbx_builtin_background(struct ast_channel *chan, void *data)
{
	int res;
	/* Answer if need be */
	if (chan->_state != AST_STATE_UP)
		if (ast_answer(chan))
			return -1;
	/* Stop anything playing */
	ast_stopstream(chan);
	/* Stream a file */
	res = ast_streamfile(chan, (char *)data, chan->language);
	if (!res) {
		res = ast_waitstream(chan, AST_DIGIT_ANY);
		ast_stopstream(chan);
	}
	return res;
}

static int pbx_builtin_atimeout(struct ast_channel *chan, void *data)
{
	int x = atoi((char *) data);
	/* Set the timeout for how long to wait between digits */
	ast_channel_setwhentohangup(chan,x);
	if (option_verbose > 2)
		ast_verbose( VERBOSE_PREFIX_3 "Set Absolute Timeout to %d\n", x);
	return 0;
}

static int pbx_builtin_rtimeout(struct ast_channel *chan, void *data)
{
	/* Set the timeout for how long to wait between digits */
	chan->pbx->rtimeout = atoi((char *)data);
	if (option_verbose > 2)
		ast_verbose( VERBOSE_PREFIX_3 "Set Response Timeout to %d\n", chan->pbx->rtimeout);
	return 0;
}

static int pbx_builtin_dtimeout(struct ast_channel *chan, void *data)
{
	/* Set the timeout for how long to wait between digits */
	chan->pbx->dtimeout = atoi((char *)data);
	if (option_verbose > 2)
		ast_verbose( VERBOSE_PREFIX_3 "Set Digit Timeout to %d\n", chan->pbx->dtimeout);
	return 0;
}

static int pbx_builtin_goto(struct ast_channel *chan, void *data)
{
	char *s;
	char *exten, *pri, *context;
	char *stringp=NULL;
	if (!data || !strlen(data)) {
		ast_log(LOG_WARNING, "Goto requires an argument (optional context|optional extension|priority)\n");
		return -1;
	}
	s = strdup((void *) data);
	stringp=s;
	context = strsep(&stringp, "|");
	exten = strsep(&stringp, "|");
	if (!exten) {
		/* Only a priority in this one */
		pri = context;
		exten = NULL;
		context = NULL;
	} else {
		pri = strsep(&stringp, "|");
		if (!pri) {
			/* Only an extension and priority in this one */
			pri = exten;
			exten = context;
			context = NULL;
		}
	}
	if (atoi(pri) < 0) {
		ast_log(LOG_WARNING, "Priority '%s' must be a number > 0\n", pri);
		free(s);
		return -1;
	}
	/* At this point we have a priority and maybe an extension and a context */
	chan->priority = atoi(pri) - 1;
	if (exten && strcasecmp(exten, "BYEXTENSION"))
		strncpy(chan->exten, exten, sizeof(chan->exten)-1);
	if (context)
		strncpy(chan->context, context, sizeof(chan->context)-1);
	if (option_verbose > 2)
		ast_verbose( VERBOSE_PREFIX_3 "Goto (%s,%s,%d)\n", chan->context,chan->exten, chan->priority+1);
	ast_cdr_update(chan);
	return 0;
}

char *pbx_builtin_getvar_helper(struct ast_channel *chan, char *name) {
	struct ast_var_t *variables;
	struct varshead *headp;

    if (chan)
        headp=&chan->varshead;
	else
		headp=&globals;

	if (name) {
		AST_LIST_TRAVERSE(headp,variables,entries) {
			if (!strcmp(name, ast_var_name(variables)))
				return ast_var_value(variables);
		}
		if (headp != &globals) {
			/* Check global variables if we haven't already */
			headp = &globals;
			AST_LIST_TRAVERSE(headp,variables,entries) {
				if (!strcmp(name, ast_var_name(variables)))
					return ast_var_value(variables);
			}
		}
	}
	return NULL;
}

void pbx_builtin_setvar_helper(struct ast_channel *chan, char *name, char *value) {
	struct ast_var_t *newvariable;
        struct varshead *headp;
    if (chan)
        headp=&chan->varshead;
	else
		headp=&globals;
                
	AST_LIST_TRAVERSE (headp,newvariable,entries) {
		if (strcasecmp(ast_var_name(newvariable),name)==0) {
			/* there is already such a variable, delete it */
			AST_LIST_REMOVE(headp,newvariable,ast_var_t,entries);
			ast_var_delete(newvariable);
			break;
		}
	} 
	
	if (value) {
		if ((option_verbose > 1) && (headp == &globals))
			ast_verbose(VERBOSE_PREFIX_3 "Setting global variable '%s' to '%s'\n",name, value);
		newvariable=ast_var_assign(name,value);	
		AST_LIST_INSERT_HEAD(headp,newvariable,entries);
	}
}

int pbx_builtin_setvar(struct ast_channel *chan, void *data)
{
	char *name;
	char *value;
	char *stringp=NULL;
                
	if (!data || !strlen(data)) {
		ast_log(LOG_WARNING, "Ignoring, since there is no variable to set\n");
		return 0;
	}
	
	stringp=data;
	name=strsep(&stringp,"=");
	value=strsep(&stringp,"\0"); 
	
	pbx_builtin_setvar_helper(chan,name,value);
			
        return(0);
}

static int pbx_builtin_setglobalvar(struct ast_channel *chan, void *data)
{
	char *name;
	char *value;
	char *stringp=NULL;
                
	if (!data || !strlen(data)) {
		ast_log(LOG_WARNING, "Ignoring, since there is no variable to set\n");
		return 0;
	}
	
	stringp=data;
	name=strsep(&stringp,"=");
	value=strsep(&stringp,"\0"); 
	
	pbx_builtin_setvar_helper(NULL,name,value);
			
        return(0);
}


static int pbx_builtin_noop(struct ast_channel *chan, void *data)
{
	return 0;
}


void pbx_builtin_clear_globals(void)
{
	struct ast_var_t *vardata;
	while (!AST_LIST_EMPTY(&globals)) {
		vardata = AST_LIST_FIRST(&globals);
		AST_LIST_REMOVE_HEAD(&globals, entries);
		ast_var_delete(vardata);
	}
}

static int pbx_checkcondition(char *condition) {
	char *s;
	int ret;
	
	s=strdup(condition);
	
	ret=1;
	
	if ((strcasecmp(s,"0")) || (strlen(s)==0)) {
		ret=0;
	}
	
	free(s);
	return(ret);
}

static int pbx_builtin_gotoif(struct ast_channel *chan, void *data)
{
	char *condition,*branch1,*branch2,*branch;
	char *s;
	int rc;
	char *stringp=NULL;

	if (!data || !strlen(data)) {
		ast_log(LOG_WARNING, "Ignoring, since there is no variable to set\n");
		return 0;
	}
	
	s=strdup(data);
	stringp=s;
	condition=strsep(&stringp,"?");
	branch1=strsep(&stringp,":");
	branch2=strsep(&stringp,"");
	
	if (pbx_checkcondition(condition)) {
		branch=branch2;
	} else {
		branch=branch1;
	}
	
	if ((branch==NULL) || (strlen(branch)==0)) {
		ast_log(LOG_WARNING, "Not taking any branch\n");
		return(0);
	}
	
	rc=pbx_builtin_goto(chan,branch);
	free(s);
	return(rc);
}           

static int pbx_builtin_saynumber(struct ast_channel *chan, void *data)
{
	int res = 0;
	if (data && atoi((char *)data) )
		res = ast_say_number(chan, atoi((char *)data), "", chan->language);
	return res;
}

static int pbx_builtin_saydigits(struct ast_channel *chan, void *data)
{
	int res = 0;
	if (data)
		res = ast_say_digit_str(chan, (char *)data, "", chan->language);
	return res;
}
	
int load_pbx(void)
{
	int x;
	/* Initialize the PBX */
	if (option_verbose) {
		ast_verbose( "Asterisk PBX Core Initializing\n");
		ast_verbose( "Registering builtin applications:\n");
	}
	ast_cli_register(&show_applications_cli);
	ast_cli_register(&show_application_cli);
	ast_cli_register(&show_dialplan_cli);
	ast_cli_register(&show_switches_cli);
	for (x=0;x<sizeof(builtins) / sizeof(struct pbx_builtin); x++) {
		if (option_verbose)
			ast_verbose( VERBOSE_PREFIX_1 "[%s]\n", builtins[x].name);
		if (ast_register_application(builtins[x].name, builtins[x].execute, builtins[x].synopsis, builtins[x].description)) {
			ast_log(LOG_ERROR, "Unable to register builtin application '%s'\n", builtins[x].name);
			return -1;
		}
	}
	return 0;
}

/*
 * Lock context list functions ...
 */
int ast_lock_contexts()
{
	return ast_mutex_lock(&conlock);
}

int ast_unlock_contexts()
{
	return ast_mutex_unlock(&conlock);
}

/*
 * Lock context ...
 */
int ast_lock_context(struct ast_context *con)
{
	return ast_mutex_lock(&con->lock);
}

int ast_unlock_context(struct ast_context *con)
{
	return ast_mutex_unlock(&con->lock);
}

/*
 * Name functions ...
 */
char *ast_get_context_name(struct ast_context *con)
{
	return con ? con->name : NULL;
}

char *ast_get_extension_name(struct ast_exten *exten)
{
	return exten ? exten->exten : NULL;
}

char *ast_get_include_name(struct ast_include *inc)
{
	return inc ? inc->name : NULL;
}

char *ast_get_ignorepat_name(struct ast_ignorepat *ip)
{
	return ip ? ip->pattern : NULL;
}

int ast_get_extension_priority(struct ast_exten *exten)
{
	return exten ? exten->priority : -1;
}

/*
 * Registrar info functions ...
 */
char *ast_get_context_registrar(struct ast_context *c)
{
	return c ? c->registrar : NULL;
}

char *ast_get_extension_registrar(struct ast_exten *e)
{
	return e ? e->registrar : NULL;
}

char *ast_get_include_registrar(struct ast_include *i)
{
	return i ? i->registrar : NULL;
}

char *ast_get_ignorepat_registrar(struct ast_ignorepat *ip)
{
	return ip ? ip->registrar : NULL;
}

char *ast_get_extension_app(struct ast_exten *e)
{
	return e ? e->app : NULL;
}

void *ast_get_extension_app_data(struct ast_exten *e)
{
	return e ? e->data : NULL;
}

char *ast_get_switch_name(struct ast_sw *sw)
{
	return sw ? sw->name : NULL;
}

char *ast_get_switch_data(struct ast_sw *sw)
{
	return sw ? sw->data : NULL;
}

char *ast_get_switch_registrar(struct ast_sw *sw)
{
	return sw ? sw->registrar : NULL;
}

/*
 * Walking functions ...
 */
struct ast_context *ast_walk_contexts(struct ast_context *con)
{
	if (!con)
		return contexts;
	else
		return con->next;
}

struct ast_exten *ast_walk_context_extensions(struct ast_context *con,
	struct ast_exten *exten)
{
	if (!exten)
		return con ? con->root : NULL;
	else
		return exten->next;
}

struct ast_sw *ast_walk_context_switches(struct ast_context *con,
	struct ast_sw *sw)
{
	if (!sw)
		return con ? con->alts : NULL;
	else
		return sw->next;
}

struct ast_exten *ast_walk_extension_priorities(struct ast_exten *exten,
	struct ast_exten *priority)
{
	if (!priority)
		return exten;
	else
		return priority->peer;
}

struct ast_include *ast_walk_context_includes(struct ast_context *con,
	struct ast_include *inc)
{
	if (!inc)
		return con ? con->includes : NULL;
	else
		return inc->next;
}

struct ast_ignorepat *ast_walk_context_ignorepats(struct ast_context *con,
	struct ast_ignorepat *ip)
{
	if (!ip)
		return con ? con->ignorepats : NULL;
	else
		return ip->next;
}

int ast_context_verify_includes(struct ast_context *con)
{
	struct ast_include *inc;
	int res = 0;

	for (inc = ast_walk_context_includes(con, NULL); inc; inc = ast_walk_context_includes(con, inc))
		if (!ast_context_find(inc->rname)) {
			res = -1;
			ast_log(LOG_WARNING, "Context '%s' tries includes non-existant context '%s'\n",
					ast_get_context_name(con), inc->rname);
		}
	return res;
}