function channel_create_stdapi_net_udp_client($req, &$pkt)
{
my_print("creating udp client");
$peer_host_tlv = packet_get_tlv($req, TLV_TYPE_PEER_HOST);
$peer_port_tlv = packet_get_tlv($req, TLV_TYPE_PEER_PORT);
# We can't actually do anything with local_host and local_port because PHP
# doesn't let us specify these values in any of the exposed socket API
# functions.
#$local_host_tlv = packet_get_tlv($req, TLV_TYPE_LOCAL_HOST);
#$local_port_tlv = packet_get_tlv($req, TLV_TYPE_LOCAL_PORT);
$sock = connect($peer_host_tlv['value'], $peer_port_tlv['value'], 'udp');
my_print("UDP channel on {$sock}");
if (!$sock) {
return ERROR_CONNECTION_ERROR;
}
#
# If we got here, the connection worked, respond with the new channel ID
#
$id = register_channel($sock);
packet_add_tlv($pkt, create_tlv(TLV_TYPE_CHANNEL_ID, $id));
add_reader($sock);
return ERROR_SUCCESS;
}
function core_channel_interact($req, &$pkt)
{
global $readers;
my_print("doing channel interact");
$chan_tlv = packet_get_tlv($req, TLV_TYPE_CHANNEL_ID);
$id = $chan_tlv['value'];
# True means start interacting, False means stop
$toggle_tlv = packet_get_tlv($req, TLV_TYPE_BOOL);
$c = get_channel_by_id($id);
if ($c) {
if ($toggle_tlv['value']) {
# Start interacting. If we're already interacting with this
# channel, it's an error and we should return failure.
if (!in_array($c[1], $readers)) {
# stdout
add_reader($c[1]);
# Make sure we don't add the same resource twice in the case
# that stdin == stderr
if (array_key_exists(2, $c) && $c[1] != $c[2]) {
# stderr
add_reader($c[2]);
}
$ret = ERROR_SUCCESS;
} else {
# Already interacting
$ret = ERROR_FAILURE;
}
} else {
# Stop interacting. If we're not interacting yet with this
# channel, it's an error and we should return failure.
if (in_array($c[1], $readers)) {
remove_reader($c[1]);
# stdout
remove_reader($c[2]);
# stderr
$ret = ERROR_SUCCESS;
} else {
# Not interacting. This is technically failure, but it seems
# the client sends us two of these requests in quick succession
# causing the second one to always return failure. When that
# happens we fail to clean up properly, so always return
# success here.
$ret = ERROR_SUCCESS;
}
}
} else {
# Not a valid channel
my_print("Trying to interact with an invalid channel");
$ret = ERROR_FAILURE;
}
return $ret;
}
function core_channel_interact($req, &$pkt)
{
global $readers;
my_print("doing channel interact");
$chan_tlv = packet_get_tlv($req, TLV_TYPE_CHANNEL_ID);
$id = $chan_tlv['value'];
# True means start interacting, False means stop
$toggle_tlv = packet_get_tlv($req, TLV_TYPE_BOOL);
$c = get_channel_by_id($id);
if ($c) {
if ($toggle_tlv['value']) {
# Start interacting. If we're already interacting with this
# channel, it's an error and we should return failure.
if (!in_array($c[1], $readers)) {
# stdout
add_reader($c[1]);
# stderr, don't care if it fails
if (array_key_exists(2, $c) && $c[1] != $c[2]) {
add_reader($c[2]);
}
$ret = ERROR_SUCCESS;
} else {
# Already interacting
$ret = ERROR_FAILURE;
}
} else {
# Stop interacting. If we're not interacting yet with this
# channel, it's an error and we should return failure.
if (in_array($c[1], $readers)) {
remove_reader($c[1]);
# stdout
remove_reader($c[2]);
# stderr
$ret = ERROR_SUCCESS;
} else {
# Not interacting
$ret = ERROR_FAILURE;
}
}
} else {
# Not a valid channel
$ret = ERROR_FAILURE;
}
return $ret;
}
