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asterisk/apps/app_dial.c

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/*
* Asterisk -- A telephony toolkit for Linux.
*
* Trivial application to dial a channel
*
* Copyright (C) 1999, Mark Spencer
*
* Mark Spencer <markster@linux-support.net>
*
* This program is free software, distributed under the terms of
* the GNU General Public License
*/
#include <asterisk/file.h>
#include <asterisk/logger.h>
#include <asterisk/channel.h>
#include <asterisk/pbx.h>
#include <asterisk/options.h>
#include <asterisk/module.h>
#include <asterisk/translate.h>
#include <asterisk/say.h>
#include <stdlib.h>
#include <errno.h>
#include <unistd.h>
#include <string.h>
#include <stdlib.h>
#include <stdio.h>
#include <sys/time.h>
#include <sys/signal.h>
#include <netinet/in.h>
#include <pthread.h>
static char *tdesc = "Dialing/Parking Application";
static char *app = "Dial";
static char *parkedcall = "ParkedCall";
static char *synopsis = "Place an call and connect to the current channel";
static char *registrar = "app_dial";
static char *descrip =
" Dial(Technology/resource[&Technology2/resource2...][|timeout][|transfer]): Requests one or more channels\n"
" and places specified outgoing calls on them. As soon as a channel answers, the Dial app\n"
" will answer the originating channel (if it needs to be answered) and will bridge a call\n"
" with the channel which first answered. All other calls placed by the Dial app will be\n"
" hung up. If a timeout is not specified, the Dial application will wait indefinitely until\n"
" either one of the called channels answers, the user hangs up, or all channels return busy or\n"
" error. In general, the dialler will return 0 if it was unable to place the call, or the\n"
" timeout expired. However, if all channels were busy, and there exists an extension with\n"
" priority n+101 (where n is the priority of the dialler instance), then it will be the\n"
" next executed extension (this allows you to setup different behavior on busy from no-answer)\n."
" This application returns -1 if the originating channel hangs up, or if the call is bridged and\n"
" either of the parties in the bridge terminate the call. The transfer string may contain a\n"
" 't' to allow the called user transfer a call or 'T' to allow the calling user to transfer the call.\n"
" In addition to transferring the call, a call may be parked and then picked up by another user.\n";
/* No more than 45 seconds parked before you do something with them */
static int parkingtime = 45000;
/* Context for which parking is made accessible */
static char parking_con[AST_MAX_EXTENSION] = "parkedcalls";
/* Extension you type to park the call */
static char parking_ext[AST_MAX_EXTENSION] = "700";
/* First available extension for parking */
static int parking_start = 701;
/* Last available extension for parking */
static int parking_stop = 750;
/* We define a customer "local user" structure because we
use it not only for keeping track of what is in use but
also for keeping track of who we're dialing. */
struct localuser {
struct ast_channel *chan;
int stillgoing;
int allowredirect;
struct localuser *next;
};
struct parkeduser {
struct ast_channel *chan;
struct timeval start;
int parkingnum;
/* Where to go if our parking time expires */
char context[AST_MAX_EXTENSION];
char exten[AST_MAX_EXTENSION];
int priority;
struct parkeduser *next;
};
static struct parkeduser *parkinglot;
static pthread_mutex_t parking_lock = PTHREAD_MUTEX_INITIALIZER;
static pthread_t parking_thread;
LOCAL_USER_DECL;
static int bridge_call(struct ast_channel *chan, struct ast_channel *peer, int allowredirect);
static int park_call(struct ast_channel *chan, struct ast_channel *peer)
{
/* We put the user in the parking list, then wake up the parking thread to be sure it looks
after these channels too */
struct parkeduser *pu, *cur;
int x;
pu = malloc(sizeof(struct parkeduser));
if (pu) {
ast_pthread_mutex_lock(&parking_lock);
for (x=parking_start;x<=parking_stop;x++) {
cur = parkinglot;
while(cur) {
if (cur->parkingnum == x)
break;
cur = cur->next;
}
if (!cur)
break;
}
if (x <= parking_stop) {
pu->chan = chan;
gettimeofday(&pu->start, NULL);
pu->parkingnum = x;
/* Remember what had been dialed, so that if the parking
expires, we try to come back to the same place */
strncpy(pu->context, chan->context, sizeof(pu->context));
strncpy(pu->exten, chan->exten, sizeof(pu->exten));
pu->priority = chan->priority;
pu->next = parkinglot;
parkinglot = pu;
ast_pthread_mutex_unlock(&parking_lock);
/* Wake up the (presumably select()ing) thread */
pthread_kill(parking_thread, SIGURG);
if (option_verbose > 1)
ast_verbose(VERBOSE_PREFIX_2 "Parked %s on %d\n", pu->chan->name, pu->parkingnum);
ast_say_digits(peer, pu->parkingnum, peer->language);
return 0;
} else {
ast_log(LOG_WARNING, "No more parking spaces\n");
free(pu);
ast_pthread_mutex_unlock(&parking_lock);
return -1;
}
} else {
ast_log(LOG_WARNING, "Out of memory\n");
return -1;
}
return 0;
}
static void *do_parking_thread(void *ignore)
{
int ms, tms, max;
struct parkeduser *pu, *pl, *pt = NULL;
struct timeval tv;
struct ast_frame *f;
int x;
fd_set rfds, efds;
fd_set nrfds, nefds;
FD_ZERO(&rfds);
FD_ZERO(&efds);
for (;;) {
ms = -1;
max = -1;
ast_pthread_mutex_lock(&parking_lock);
pl = NULL;
pu = parkinglot;
gettimeofday(&tv, NULL);
FD_ZERO(&nrfds);
FD_ZERO(&nefds);
while(pu) {
tms = (tv.tv_sec - pu->start.tv_sec) * 1000 + (tv.tv_usec - pu->start.tv_usec) / 1000;
if (tms > parkingtime) {
/* They've been waiting too long, send them back to where they came. Theoretically they
should have their original extensions and such, but we copy to be on the safe side */
strncpy(pu->chan->exten, pu->exten, sizeof(pu->chan->exten));
strncpy(pu->chan->context, pu->context, sizeof(pu->chan->context));
pu->chan->priority = pu->priority;
/* Start up the PBX, or hang them up */
if (ast_pbx_start(pu->chan)) {
ast_log(LOG_WARNING, "Unable to restart the PBX for user on '%s', hanging them up...\n", pu->chan->name);
ast_hangup(pu->chan);
}
/* And take them out of the parking lot */
if (pl)
pl->next = pu->next;
else
parkinglot = pu->next;
pt = pu;
pu = pu->next;
free(pt);
} else {
for (x=0;x<AST_MAX_FDS;x++) {
if ((pu->chan->fds[x] > -1) && (FD_ISSET(pu->chan->fds[x], &rfds) || FD_ISSET(pu->chan->fds[x], &efds))) {
if (FD_ISSET(pu->chan->fds[x], &efds))
pu->chan->exception = 1;
pu->chan->fdno = x;
/* See if they need servicing */
f = ast_read(pu->chan);
if (!f || ((f->frametype == AST_FRAME_CONTROL) && (f->subclass == AST_CONTROL_HANGUP))) {
/* There's a problem, hang them up*/
if (option_verbose > 1)
ast_verbose(VERBOSE_PREFIX_2 "%s got tired of being parked\n", pu->chan->name);
ast_hangup(pu->chan);
/* And take them out of the parking lot */
if (pl)
pl->next = pu->next;
else
parkinglot = pu->next;
pt = pu;
pu = pu->next;
free(pt);
break;
} else {
/* XXX Maybe we could do something with packets, like dial "0" for operator or something XXX */
ast_frfree(f);
goto std; /* XXX Ick: jumping into an else statement??? XXX */
}
}
}
if (x >= AST_MAX_FDS) {
/* Keep this one for next one */
std: FD_SET(pu->chan->fds[x], &nrfds);
FD_SET(pu->chan->fds[x], &nefds);
/* Keep track of our longest wait */
if ((tms < ms) || (ms < 0))
ms = tms;
if (pu->chan->fds[x] > max)
max = pu->chan->fds[x];
pl = pu;
pu = pu->next;
}
}
}
ast_pthread_mutex_unlock(&parking_lock);
rfds = nrfds;
efds = nefds;
tv.tv_sec = ms / 1000;
tv.tv_usec = (ms % 1000) * 1000;
/* Wait for something to happen */
select(max + 1, &rfds, NULL, &efds, (ms > -1) ? &tv : NULL);
pthread_testcancel();
}
return NULL; /* Never reached */
}
static void hanguptree(struct localuser *outgoing, struct ast_channel *exception)
{
/* Hang up a tree of stuff */
struct localuser *oo;
while(outgoing) {
/* Hangup any existing lines we have open */
if (outgoing->chan != exception)
ast_hangup(outgoing->chan);
oo = outgoing;
outgoing=outgoing->next;
free(oo);
}
}
#define MAX 256
static struct ast_channel *wait_for_answer(struct ast_channel *in, struct localuser *outgoing, int *to, int *allowredir)
{
struct localuser *o;
int found;
int numlines;
int sentringing = 0;
int numbusies = 0;
int orig = *to;
struct ast_frame *f;
struct ast_channel *peer = NULL;
struct ast_channel *watchers[MAX];
int pos;
int single;
struct ast_channel *winner;
single = (outgoing && !outgoing->next);
if (single) {
/* If we are calling a single channel, make them compatible for in-band tone purpose */
ast_channel_make_compatible(outgoing->chan, in);
}
while(*to && !peer) {
o = outgoing;
found = -1;
pos = 1;
numlines = 0;
watchers[0] = in;
while(o) {
/* Keep track of important channels */
if (o->stillgoing) {
watchers[pos++] = o->chan;
found = 1;
}
o = o->next;
numlines++;
}
if (found < 0) {
if (numlines == numbusies) {
if (option_verbose > 2)
ast_verbose( VERBOSE_PREFIX_2 "Everyone is busy at this time\n");
/* See if there is a special busy message */
if (ast_exists_extension(in, in->context, in->exten, in->priority + 101))
in->priority+=100;
} else {
if (option_verbose > 2)
ast_verbose( VERBOSE_PREFIX_2 "No one is available to answer at this time\n");
}
*to = 0;
return NULL;
}
winner = ast_waitfor_n(watchers, pos, to);
o = outgoing;
while(o) {
if (o->chan == winner) {
f = ast_read(winner);
if (f) {
if (f->frametype == AST_FRAME_CONTROL) {
switch(f->subclass) {
case AST_CONTROL_ANSWER:
/* This is our guy if someone answered. */
if (!peer) {
if (option_verbose > 2)
ast_verbose( VERBOSE_PREFIX_3 "%s answered %s\n", o->chan->name, in->name);
peer = o->chan;
*allowredir = o->allowredirect;
}
break;
case AST_CONTROL_BUSY:
if (option_verbose > 2)
ast_verbose( VERBOSE_PREFIX_3 "%s is busy\n", o->chan->name);
o->stillgoing = 0;
numbusies++;
break;
case AST_CONTROL_RINGING:
if (option_verbose > 2)
ast_verbose( VERBOSE_PREFIX_3 "%s is ringing\n", o->chan->name);
if (!sentringing) {
ast_indicate(in, AST_CONTROL_RINGING);
sentringing++;
}
break;
case AST_CONTROL_OFFHOOK:
/* Ignore going off hook */
break;
default:
ast_log(LOG_DEBUG, "Dunno what to do with control type %d\n", f->subclass);
}
} else if (single && (f->frametype == AST_FRAME_VOICE)) {
if (ast_write(in, f))
ast_log(LOG_WARNING, "Unable to forward frame\n");
}
ast_frfree(f);
} else {
o->stillgoing = 0;
}
}
o = o->next;
}
if (winner == in) {
f = ast_read(in);
#if 0
if (f && (f->frametype != AST_FRAME_VOICE))
printf("Frame type: %d, %d\n", f->frametype, f->subclass);
#endif
if (!f || ((f->frametype == AST_FRAME_CONTROL) && (f->subclass = AST_CONTROL_HANGUP))) {
/* Got hung up */
*to=-1;
return NULL;
}
}
if (!*to && (option_verbose > 2))
ast_verbose( VERBOSE_PREFIX_3 "Nobody picked up in %d ms\n", orig);
}
return peer;
}
static int bridge_call(struct ast_channel *chan, struct ast_channel *peer, int allowredirect)
{
/* Copy voice back and forth between the two channels. Give the peer
the ability to transfer calls with '#<extension' syntax. */
int len;
struct ast_frame *f;
struct ast_channel *who;
char newext[256], *ptr;
int res;
struct ast_option_header *aoh;
/* Answer if need be */
if (chan->state != AST_STATE_UP)
if (ast_answer(chan))
return -1;
peer->appl = "Bridged Call";
peer->data = chan->name;
for (;;) {
res = ast_channel_bridge(chan, peer, AST_BRIDGE_DTMF_CHANNEL_1, &f, &who);
if (res < 0) {
ast_log(LOG_WARNING, "Bridge failed on channels %s and %s\n", chan->name, peer->name);
return -1;
}
if (!f || ((f->frametype == AST_FRAME_CONTROL) && ((f->subclass == AST_CONTROL_HANGUP) || (f->subclass == AST_CONTROL_BUSY) ||
(f->subclass == AST_CONTROL_CONGESTION)))) {
res = -1;
break;
}
if ((f->frametype == AST_FRAME_CONTROL) && (f->subclass == AST_CONTROL_RINGING)) {
if (who == chan)
ast_indicate(peer, AST_CONTROL_RINGING);
else
ast_indicate(chan, AST_CONTROL_RINGING);
}
if ((f->frametype == AST_FRAME_CONTROL) && (f->subclass == AST_CONTROL_OPTION)) {
aoh = f->data;
/* Forward option Requests */
if (aoh && (aoh->flag == AST_OPTION_FLAG_REQUEST)) {
if (who == chan)
ast_channel_setoption(peer, ntohs(aoh->option), aoh->data, f->datalen - sizeof(struct ast_option_header), 0);
else
ast_channel_setoption(chan, ntohs(aoh->option), aoh->data, f->datalen - sizeof(struct ast_option_header), 0);
}
}
if ((f->frametype == AST_FRAME_DTMF) && (who == peer) && allowredirect &&
(f->subclass == '#')) {
memset(newext, 0, sizeof(newext));
ptr = newext;
len = ast_pbx_longest_extension(chan->context) + 1;
if (len < ast_pbx_longest_extension("default") + 1)
len = ast_pbx_longest_extension("default") + 1;
/* Transfer */
if ((res=ast_streamfile(peer, "pbx-transfer", chan->language)))
break;
if ((res=ast_waitstream(peer, AST_DIGIT_ANY)) < 0)
break;
ast_stopstream(peer);
if (res > 0) {
/* If they've typed a digit already, handle it */
newext[0] = res;
ptr++;
len --;
}
res = ast_readstring(peer, ptr, len, 3000, 2000, "#");
if (res)
break;
if (!strcmp(newext, parking_ext)) {
if (!park_call(chan, peer)) {
/* We return non-zero, but tell the PBX not to hang the channel when
the thread dies -- We have to be careful now though. We are responsible for
hanging up the channel, else it will never be hung up! */
res=AST_PBX_KEEPALIVE;
break;
} else {
ast_log(LOG_WARNING, "Unable to park call %s\n", chan->name);
}
/* XXX Maybe we should have another message here instead of invalid extension XXX */
} else if (ast_exists_extension(chan, peer->context, newext, 1)) {
/* Set the channel's new extension, since it exists, using peer context */
strncpy(chan->exten, newext, sizeof(chan->exten));
strncpy(chan->context, peer->context, sizeof(chan->context));
chan->priority = 0;
ast_frfree(f);
if (option_verbose > 2)
ast_verbose(VERBOSE_PREFIX_3 "Transferring %s to '%s' (context %s) priority 1\n", chan->name, chan->exten, chan->context);
res=0;
break;
}
res = ast_streamfile(peer, "pbx-invalid", chan->language);
if (res)
break;
res = ast_waitstream(peer, AST_DIGIT_ANY);
ast_stopstream(peer);
res = 0;
} else {
#if 1
ast_log(LOG_DEBUG, "Read from %s (%d,%d)\n", who->name, f->frametype, f->subclass);
#endif
}
}
return res;
}
static int park_exec(struct ast_channel *chan, void *data)
{
int res=0;
struct localuser *u;
struct ast_channel *peer=NULL;
struct parkeduser *pu, *pl=NULL;
int park;
if (!data) {
ast_log(LOG_WARNING, "Park requires an argument (extension number)\n");
return -1;
}
LOCAL_USER_ADD(u);
park = atoi((char *)data);
ast_pthread_mutex_lock(&parking_lock);
pu = parkinglot;
while(pu) {
if (pu->parkingnum == park) {
if (pl)
pl->next = pu->next;
else
parkinglot = pu->next;
break;
}
pu = pu->next;
}
ast_pthread_mutex_unlock(&parking_lock);
if (pu) {
peer = pu->chan;
free(pu);
}
if (peer) {
res = ast_channel_make_compatible(chan, peer);
if (res < 0) {
ast_log(LOG_WARNING, "Could not make channels %s and %s compatible for bridge\n", chan->name, peer->name);
ast_hangup(peer);
return -1;
}
/* This runs sorta backwards, since we give the incoming channel control, as if it
were the person called. */
if (option_verbose > 2)
ast_verbose(VERBOSE_PREFIX_3 "Channel %s connected to parked call %d\n", chan->name, park);
res = bridge_call(peer, chan, 1);
/* Simulate the PBX hanging up */
if (res != AST_PBX_KEEPALIVE)
ast_hangup(peer);
return -1;
} else {
/* XXX Play a message XXX */
if (option_verbose > 2)
ast_verbose(VERBOSE_PREFIX_3 "Channel %s tried to talk to non-existant parked call %d\n", chan->name, park);
res = -1;
}
LOCAL_USER_REMOVE(u);
return res;
}
static int dial_exec(struct ast_channel *chan, void *data)
{
int res=-1;
struct localuser *u;
char *info, *peers, *timeout, *tech, *number, *rest, *cur;
struct localuser *outgoing=NULL, *tmp;
struct ast_channel *peer;
int to;
int allowredir=0;
char numsubst[AST_MAX_EXTENSION];
char restofit[AST_MAX_EXTENSION];
char *transfer = NULL;
char *newnum;
if (!data) {
ast_log(LOG_WARNING, "Dial requires an argument (technology1/number1&technology2/number2...|optional timeout)\n");
return -1;
}
LOCAL_USER_ADD(u);
/* Parse our arguments XXX Check for failure XXX */
info = malloc(strlen((char *)data) + AST_MAX_EXTENSION);
if (!info) {
ast_log(LOG_WARNING, "Out of memory\n");
return -1;
}
strncpy(info, (char *)data, strlen((char *)data) + AST_MAX_EXTENSION);
peers = info;
if (peers) {
timeout = strchr(info, '|');
if (timeout) {
*timeout = '\0';
timeout++;
transfer = strchr(timeout, '|');
if (transfer) {
*transfer = '\0';
transfer++;
}
}
} else
timeout = NULL;
if (!peers || !strlen(peers)) {
ast_log(LOG_WARNING, "Dial argument takes format (technology1/number1&technology2/number2...|optional timeout)\n");
goto out;
}
cur = peers;
do {
/* Remember where to start next time */
rest = strchr(cur, '&');
if (rest) {
*rest = 0;
rest++;
}
/* Get a technology/[device:]number pair */
tech = cur;
number = strchr(tech, '/');
if (!number) {
ast_log(LOG_WARNING, "Dial argument takes format (technology1/[device:]number1&technology2/[device:]number2...|optional timeout)\n");
goto out;
}
*number = '\0';
number++;
tmp = malloc(sizeof(struct localuser));
if (!tmp) {
ast_log(LOG_WARNING, "Out of memory\n");
goto out;
}
if (transfer && (strchr(transfer, 't')))
tmp->allowredirect = 1;
else
tmp->allowredirect = 0;
strncpy(numsubst, number, sizeof(numsubst));
/* If we're dialing by extension, look at the extension to know what to dial */
if ((newnum = strstr(numsubst, "BYEXTENSION"))) {
strncpy(restofit, newnum + strlen("BYEXTENSION"), sizeof(restofit));
snprintf(newnum, sizeof(numsubst) - (newnum - numsubst), "%s%s", chan->exten,restofit);
if (option_debug)
ast_log(LOG_DEBUG, "Dialing by extension %s\n", numsubst);
}
/* Request the peer */
tmp->chan = ast_request(tech, chan->nativeformats, numsubst);
if (!tmp->chan) {
/* If we can't, just go on to the next call */
ast_log(LOG_WARNING, "Unable to create channel of type '%s'\n", tech);
free(tmp);
cur = rest;
continue;
}
tmp->chan->appl = "AppDial";
tmp->chan->data = "(Outgoing Line)";
if (tmp->chan->callerid)
free(tmp->chan->callerid);
if (chan->callerid)
tmp->chan->callerid = strdup(chan->callerid);
else
tmp->chan->callerid = NULL;
/* Place the call, but don't wait on the answer */
res = ast_call(tmp->chan, numsubst, 0);
if (res) {
/* Again, keep going even if there's an error */
if (option_debug)
ast_log(LOG_DEBUG, "ast call on peer returned %d\n", res);
else if (option_verbose > 2)
ast_verbose(VERBOSE_PREFIX_3 "Couldn't call %s\n", numsubst);
ast_hangup(tmp->chan);
free(tmp);
cur = rest;
continue;
} else
if (option_verbose > 2)
ast_verbose(VERBOSE_PREFIX_3 "Called %s\n", numsubst);
/* Put them in the list of outgoing thingies... We're ready now.
XXX If we're forcibly removed, these outgoing calls won't get
hung up XXX */
tmp->stillgoing = -1;
tmp->next = outgoing;
outgoing = tmp;
cur = rest;
} while(cur);
if (timeout && strlen(timeout))
to = atoi(timeout) * 1000;
else
to = -1;
peer = wait_for_answer(chan, outgoing, &to, &allowredir);
if (!peer) {
if (to)
/* Musta gotten hung up */
res = -1;
else
/* Nobody answered, next please? */
res=0;
goto out;
}
if (peer) {
/* Ah ha! Someone answered within the desired timeframe. Of course after this
we will always return with -1 so that it is hung up properly after the
conversation. */
hanguptree(outgoing, peer);
outgoing = NULL;
/* Make sure channels are compatible */
res = ast_channel_make_compatible(chan, peer);
if (res < 0) {
ast_log(LOG_WARNING, "Had to drop call because I couldn't make %s compatible with %s\n", chan->name, peer->name);
ast_hangup(peer);
return -1;
}
res = bridge_call(chan, peer, allowredir);
ast_hangup(peer);
}
out:
hanguptree(outgoing, NULL);
free(info);
LOCAL_USER_REMOVE(u);
return res;
}
int unload_module(void)
{
STANDARD_HANGUP_LOCALUSERS;
return ast_unregister_application(app);
}
int load_module(void)
{
int res;
int x;
struct ast_context *con;
char exten[AST_MAX_EXTENSION];
con = ast_context_find(parking_con);
if (!con) {
con = ast_context_create(parking_con, registrar);
if (!con) {
ast_log(LOG_ERROR, "Parking context '%s' does not exist and unable to create\n", parking_con);
return -1;
}
}
for(x=parking_start; x<=parking_stop;x++) {
snprintf(exten, sizeof(exten), "%d", x);
ast_add_extension2(con, 1, exten, 1, parkedcall, strdup(exten), free, registrar);
}
pthread_create(&parking_thread, NULL, do_parking_thread, NULL);
res = ast_register_application(parkedcall, park_exec, synopsis, descrip);
if (!res)
res = ast_register_application(app, dial_exec, synopsis, descrip);
return res;
}
char *description(void)
{
return tdesc;
}
int usecount(void)
{
int res;
STANDARD_USECOUNT(res);
return res;
}
char *key()
{
return ASTERISK_GPL_KEY;
}
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