/*! \brief Callback function for hanging up a Snoop channel */
static int snoop_hangup(struct ast_channel *chan)
{
struct stasis_app_snoop *snoop = ast_channel_tech_pvt(chan);
if (snoop->spy_active) {
ast_audiohook_lock(&snoop->spy);
ast_audiohook_detach(&snoop->spy);
ast_audiohook_unlock(&snoop->spy);
}
if (snoop->whisper_active) {
ast_audiohook_lock(&snoop->whisper);
ast_audiohook_detach(&snoop->whisper);
ast_audiohook_unlock(&snoop->whisper);
}
publish_chanspy_message(snoop, 0);
ao2_cleanup(snoop);
ast_channel_tech_pvt_set(chan, NULL);
return 0;
}
static int channel_spy(struct ast_channel *chan, struct ast_autochan *spyee_autochan,
int *volfactor, int fd, struct spy_dtmf_options *user_options, struct ast_flags *flags,
char *exitcontext)
{
struct chanspy_translation_helper csth;
int running = 0, res, x = 0;
char inp[24] = {0};
char *name;
struct ast_frame *f;
struct ast_silence_generator *silgen = NULL;
struct ast_autochan *spyee_bridge_autochan = NULL;
const char *spyer_name;
if (ast_check_hangup(chan) || ast_check_hangup(spyee_autochan->chan) ||
ast_test_flag(ast_channel_flags(spyee_autochan->chan), AST_FLAG_ZOMBIE)) {
return 0;
}
ast_channel_lock(chan);
spyer_name = ast_strdupa(ast_channel_name(chan));
ast_channel_unlock(chan);
ast_channel_lock(spyee_autochan->chan);
name = ast_strdupa(ast_channel_name(spyee_autochan->chan));
ast_channel_unlock(spyee_autochan->chan);
ast_verb(2, "Spying on channel %s\n", name);
publish_chanspy_message(chan, spyee_autochan->chan, 1);
memset(&csth, 0, sizeof(csth));
ast_copy_flags(&csth.flags, flags, AST_FLAGS_ALL);
/* This is the audiohook which gives us the audio off the channel we are
spying on.
*/
ast_audiohook_init(&csth.spy_audiohook, AST_AUDIOHOOK_TYPE_SPY, "ChanSpy", 0);
if (start_spying(spyee_autochan, spyer_name, &csth.spy_audiohook)) {
ast_audiohook_destroy(&csth.spy_audiohook);
return 0;
}
if (ast_test_flag(flags, OPTION_WHISPER | OPTION_BARGE | OPTION_DTMF_SWITCH_MODES)) {
/* This audiohook will let us inject audio from our channel into the
channel we are currently spying on.
*/
ast_audiohook_init(&csth.whisper_audiohook, AST_AUDIOHOOK_TYPE_WHISPER, "ChanSpy", 0);
if (start_spying(spyee_autochan, spyer_name, &csth.whisper_audiohook)) {
ast_log(LOG_WARNING, "Unable to attach whisper audiohook to spyee %s. Whisper mode disabled!\n", name);
}
}
if (ast_test_flag(flags, OPTION_BARGE | OPTION_DTMF_SWITCH_MODES)) {
RAII_VAR(struct ast_channel *, bridged, ast_channel_bridge_peer(spyee_autochan->chan), ast_channel_cleanup);
/* And this hook lets us inject audio into the channel that the spied on
channel is currently bridged with.
*/
ast_audiohook_init(&csth.bridge_whisper_audiohook, AST_AUDIOHOOK_TYPE_WHISPER, "Chanspy", 0);
if ((spyee_bridge_autochan = ast_autochan_setup(bridged))) {
ast_channel_lock(spyee_bridge_autochan->chan);
if (start_spying(spyee_bridge_autochan, spyer_name, &csth.bridge_whisper_audiohook)) {
ast_log(LOG_WARNING, "Unable to attach barge audiohook on spyee %s. Barge mode disabled!\n", name);
}
ast_channel_unlock(spyee_bridge_autochan->chan);
}
}
struct ast_channel *stasis_app_control_snoop(struct ast_channel *chan,
enum stasis_app_snoop_direction spy, enum stasis_app_snoop_direction whisper,
const char *app, const char *app_args, const char *snoop_id)
{
RAII_VAR(struct stasis_app_snoop *, snoop, NULL, ao2_cleanup);
struct ast_format_cap *caps;
pthread_t thread;
struct ast_assigned_ids assignedids = {
.uniqueid = snoop_id,
};
if (spy == STASIS_SNOOP_DIRECTION_NONE &&
whisper == STASIS_SNOOP_DIRECTION_NONE) {
return NULL;
}
snoop = ao2_alloc_options(sizeof(*snoop), snoop_destroy, AO2_ALLOC_OPT_LOCK_NOLOCK);
if (!snoop) {
return NULL;
}
/* Allocate a buffer to store the Stasis application and arguments in */
snoop->app = ast_str_create(64);
if (!snoop->app) {
return NULL;
}
ast_str_set(&snoop->app, 0, "%s", app);
if (!ast_strlen_zero(app_args)) {
ast_str_append(&snoop->app, 0, ",%s", app_args);
}
/* Set up a timer for the Snoop channel so it wakes up at a specific interval */
snoop->timer = ast_timer_open();
if (!snoop->timer) {
return NULL;
}
ast_timer_set_rate(snoop->timer, 1000 / SNOOP_INTERVAL);
/* Determine which signed linear format should be used */
snoop_determine_format(chan, snoop);
/* Allocate a Snoop channel and set up various parameters */
snoop->chan = ast_channel_alloc(1, AST_STATE_UP, "", "", "", "", "", &assignedids, NULL, 0, "Snoop/%s-%08x", ast_channel_uniqueid(chan),
(unsigned)ast_atomic_fetchadd_int((int *)&chan_idx, +1));
if (!snoop->chan) {
return NULL;
}
ast_copy_string(snoop->uniqueid, ast_channel_uniqueid(chan), sizeof(snoop->uniqueid));
/* To keep the channel valid on the Snoop structure until it is destroyed we bump the ref up here */
ast_channel_ref(snoop->chan);
ast_channel_tech_set(snoop->chan, &snoop_tech);
ao2_ref(snoop, +1);
ast_channel_tech_pvt_set(snoop->chan, snoop);
ast_channel_set_fd(snoop->chan, 0, ast_timer_fd(snoop->timer));
/* The format on the Snoop channel will be this signed linear format, and it will never change */
caps = ast_format_cap_alloc(AST_FORMAT_CAP_FLAG_DEFAULT);
if (!caps) {
ast_channel_unlock(snoop->chan);
ast_hangup(snoop->chan);
return NULL;
}
ast_format_cap_append(caps, snoop->spy_format, 0);
ast_channel_nativeformats_set(snoop->chan, caps);
ao2_ref(caps, -1);
ast_channel_set_writeformat(snoop->chan, snoop->spy_format);
ast_channel_set_rawwriteformat(snoop->chan, snoop->spy_format);
ast_channel_set_readformat(snoop->chan, snoop->spy_format);
ast_channel_set_rawreadformat(snoop->chan, snoop->spy_format);
ast_channel_unlock(snoop->chan);
if (spy != STASIS_SNOOP_DIRECTION_NONE) {
if (snoop_setup_audiohook(chan, AST_AUDIOHOOK_TYPE_SPY, spy, &snoop->spy_direction, &snoop->spy)) {
ast_hangup(snoop->chan);
return NULL;
}
snoop->spy_samples = ast_format_get_sample_rate(snoop->spy_format) / (1000 / SNOOP_INTERVAL);
snoop->spy_active = 1;
}
/* If whispering is enabled set up the audiohook */
if (whisper != STASIS_SNOOP_DIRECTION_NONE) {
if (snoop_setup_audiohook(chan, AST_AUDIOHOOK_TYPE_WHISPER, whisper, &snoop->whisper_direction, &snoop->whisper)) {
ast_hangup(snoop->chan);
return NULL;
}
snoop->whisper_active = 1;
}
/* Create the thread which services the Snoop channel */
ao2_ref(snoop, +1);
if (ast_pthread_create_detached_background(&thread, NULL, snoop_stasis_thread, snoop)) {
ao2_cleanup(snoop);
/* No other thread is servicing this channel so we can immediately hang it up */
ast_hangup(snoop->chan);
return NULL;
}
publish_chanspy_message(snoop, 1);
/* The caller of this has a reference as well */
return ast_channel_ref(snoop->chan);
}
static int channel_spy(struct ast_channel *chan, struct ast_autochan *spyee_autochan,
int *volfactor, int fd, struct spy_dtmf_options *user_options, struct ast_flags *flags,
char *exitcontext)
{
struct chanspy_translation_helper csth;
int running = 0, bridge_connected = 0, res, x = 0;
char inp[24] = {0};
char *name;
struct ast_frame *f;
struct ast_silence_generator *silgen = NULL;
struct ast_autochan *spyee_bridge_autochan = NULL;
const char *spyer_name;
if (ast_check_hangup(chan) || ast_check_hangup(spyee_autochan->chan) ||
ast_test_flag(ast_channel_flags(spyee_autochan->chan), AST_FLAG_ZOMBIE)) {
return 0;
}
ast_channel_lock(chan);
spyer_name = ast_strdupa(ast_channel_name(chan));
ast_channel_unlock(chan);
ast_autochan_channel_lock(spyee_autochan);
name = ast_strdupa(ast_channel_name(spyee_autochan->chan));
ast_autochan_channel_unlock(spyee_autochan);
ast_verb(2, "Spying on channel %s\n", name);
publish_chanspy_message(chan, spyee_autochan->chan, 1);
memset(&csth, 0, sizeof(csth));
ast_copy_flags(&csth.flags, flags, AST_FLAGS_ALL);
/* This is the audiohook which gives us the audio off the channel we are
spying on.
*/
ast_audiohook_init(&csth.spy_audiohook, AST_AUDIOHOOK_TYPE_SPY, "ChanSpy", 0);
if (start_spying(spyee_autochan, spyer_name, &csth.spy_audiohook, flags)) {
ast_audiohook_destroy(&csth.spy_audiohook);
return 0;
}
if (ast_test_flag(flags, OPTION_WHISPER | OPTION_BARGE | OPTION_DTMF_SWITCH_MODES)) {
/* This audiohook will let us inject audio from our channel into the
channel we are currently spying on.
*/
ast_audiohook_init(&csth.whisper_audiohook, AST_AUDIOHOOK_TYPE_WHISPER, "ChanSpy", 0);
if (start_spying(spyee_autochan, spyer_name, &csth.whisper_audiohook, flags)) {
ast_log(LOG_WARNING, "Unable to attach whisper audiohook to spyee %s. Whisper mode disabled!\n", name);
}
}
ast_channel_lock(chan);
ast_set_flag(ast_channel_flags(chan), AST_FLAG_END_DTMF_ONLY);
ast_channel_unlock(chan);
csth.volfactor = *volfactor;
if (csth.volfactor) {
csth.spy_audiohook.options.read_volume = csth.volfactor;
csth.spy_audiohook.options.write_volume = csth.volfactor;
}
csth.fd = fd;
if (ast_test_flag(flags, OPTION_PRIVATE))
silgen = ast_channel_start_silence_generator(chan);
else
ast_activate_generator(chan, &spygen, &csth);
/* We can no longer rely on 'spyee' being an actual channel;
it can be hung up and freed out from under us. However, the
channel destructor will put NULL into our csth.spy.chan
field when that happens, so that is our signal that the spyee
channel has gone away.
*/
/* Note: it is very important that the ast_waitfor() be the first
condition in this expression, so that if we wait for some period
of time before receiving a frame from our spying channel, we check
for hangup on the spied-on channel _after_ knowing that a frame
has arrived, since the spied-on channel could have gone away while
we were waiting
*/
while (ast_waitfor(chan, -1) > -1 && csth.spy_audiohook.status == AST_AUDIOHOOK_STATUS_RUNNING) {
if (!(f = ast_read(chan)) || ast_check_hangup(chan)) {
running = -1;
if (f) {
ast_frfree(f);
}
break;
}
if (ast_test_flag(flags, OPTION_BARGE) && f->frametype == AST_FRAME_VOICE) {
/* This hook lets us inject audio into the channel that the spyee is currently
* bridged with. If the spyee isn't bridged with anything yet, nothing will
* be attached and we'll need to continue attempting to attach the barge
* audio hook. */
if (!bridge_connected && attach_barge(spyee_autochan, &spyee_bridge_autochan,
&csth.bridge_whisper_audiohook, spyer_name, name, flags) == 0) {
bridge_connected = 1;
}
ast_audiohook_lock(&csth.whisper_audiohook);
ast_audiohook_write_frame(&csth.whisper_audiohook, AST_AUDIOHOOK_DIRECTION_WRITE, f);
ast_audiohook_unlock(&csth.whisper_audiohook);
if (bridge_connected) {
ast_audiohook_lock(&csth.bridge_whisper_audiohook);
ast_audiohook_write_frame(&csth.bridge_whisper_audiohook, AST_AUDIOHOOK_DIRECTION_WRITE, f);
ast_audiohook_unlock(&csth.bridge_whisper_audiohook);
}
ast_frfree(f);
continue;
} else if (ast_test_flag(flags, OPTION_WHISPER) && f->frametype == AST_FRAME_VOICE) {
ast_audiohook_lock(&csth.whisper_audiohook);
ast_audiohook_write_frame(&csth.whisper_audiohook, AST_AUDIOHOOK_DIRECTION_WRITE, f);
ast_audiohook_unlock(&csth.whisper_audiohook);
ast_frfree(f);
continue;
}
res = (f->frametype == AST_FRAME_DTMF) ? f->subclass.integer : 0;
ast_frfree(f);
if (!res)
continue;
if (x == sizeof(inp))
x = 0;
if (res < 0) {
running = -1;
break;
}
if (ast_test_flag(flags, OPTION_EXIT)) {
char tmp[2];
tmp[0] = res;
tmp[1] = '\0';
if (!ast_goto_if_exists(chan, exitcontext, tmp, 1)) {
ast_debug(1, "Got DTMF %c, goto context %s\n", tmp[0], exitcontext);
pbx_builtin_setvar_helper(chan, "SPY_CHANNEL", name);
running = -2;
break;
} else {
ast_debug(2, "Exit by single digit did not work in chanspy. Extension %s does not exist in context %s\n", tmp, exitcontext);
}
} else if (res >= '0' && res <= '9') {
if (ast_test_flag(flags, OPTION_DTMF_SWITCH_MODES)) {
change_spy_mode(res, flags);
} else {
inp[x++] = res;
}
}
if (res == user_options->cycle) {
running = 0;
break;
} else if (res == user_options->exit) {
running = -2;
break;
} else if (res == user_options->volume) {
if (!ast_strlen_zero(inp)) {
running = atoi(inp);
break;
}
(*volfactor)++;
if (*volfactor > 4)
*volfactor = -4;
ast_verb(3, "Setting spy volume on %s to %d\n", ast_channel_name(chan), *volfactor);
csth.volfactor = *volfactor;
csth.spy_audiohook.options.read_volume = csth.volfactor;
csth.spy_audiohook.options.write_volume = csth.volfactor;
}
}
if (ast_test_flag(flags, OPTION_PRIVATE))
ast_channel_stop_silence_generator(chan, silgen);
else
ast_deactivate_generator(chan);
ast_channel_lock(chan);
ast_clear_flag(ast_channel_flags(chan), AST_FLAG_END_DTMF_ONLY);
ast_channel_unlock(chan);
if (ast_test_flag(flags, OPTION_WHISPER | OPTION_BARGE | OPTION_DTMF_SWITCH_MODES)) {
ast_audiohook_lock(&csth.whisper_audiohook);
ast_audiohook_detach(&csth.whisper_audiohook);
ast_audiohook_unlock(&csth.whisper_audiohook);
ast_audiohook_destroy(&csth.whisper_audiohook);
}
if (ast_test_flag(flags, OPTION_BARGE | OPTION_DTMF_SWITCH_MODES)) {
ast_audiohook_lock(&csth.bridge_whisper_audiohook);
ast_audiohook_detach(&csth.bridge_whisper_audiohook);
ast_audiohook_unlock(&csth.bridge_whisper_audiohook);
ast_audiohook_destroy(&csth.bridge_whisper_audiohook);
}
ast_audiohook_lock(&csth.spy_audiohook);
ast_audiohook_detach(&csth.spy_audiohook);
ast_audiohook_unlock(&csth.spy_audiohook);
ast_audiohook_destroy(&csth.spy_audiohook);
if (spyee_bridge_autochan) {
ast_autochan_destroy(spyee_bridge_autochan);
}
ast_verb(2, "Done Spying on channel %s\n", name);
publish_chanspy_message(chan, NULL, 0);
return running;
}
