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using Gee;
using Xmpp;
using Xmpp.Xep;
public class Dino.Plugins.Ice.TransportParameters : JingleIceUdp.IceUdpTransportParameters {
private Nice.Agent agent;
private uint stream_id;
private bool we_want_connection;
private bool remote_credentials_set;
private Map<uint8, DatagramConnection> connections = new HashMap<uint8, DatagramConnection>();
private DtlsSrtp.Handler? dtls_srtp_handler;
private class DatagramConnection : Jingle.DatagramConnection {
private Nice.Agent agent;
private DtlsSrtp.Handler? dtls_srtp_handler;
private uint stream_id;
private string? error;
private ulong sent;
private ulong sent_reported;
private ulong recv;
private ulong recv_reported;
private ulong datagram_received_id;
public DatagramConnection(Nice.Agent agent, DtlsSrtp.Handler? dtls_srtp_handler, uint stream_id, uint8 component_id) {
this.agent = agent;
this.dtls_srtp_handler = dtls_srtp_handler;
this.stream_id = stream_id;
this.component_id = component_id;
this.datagram_received_id = this.datagram_received.connect((datagram) => {
recv += datagram.length;
if (recv > recv_reported + 100000) {
debug("Received %lu bytes via stream %u component %u", recv, stream_id, component_id);
recv_reported = recv;
}
});
}
public override async void terminate(bool we_terminated, string? reason_string = null, string? reason_text = null) {
yield base.terminate(we_terminated, reason_string, reason_text);
this.disconnect(datagram_received_id);
agent = null;
dtls_srtp_handler = null;
}
public override void send_datagram(Bytes datagram) {
if (this.agent != null && is_component_ready(agent, stream_id, component_id)) {
uint8[] encrypted_data = null;
if (dtls_srtp_handler != null) {
encrypted_data = dtls_srtp_handler.process_outgoing_data(component_id, datagram.get_data());
if (encrypted_data == null) return;
}
agent.send(stream_id, component_id, encrypted_data ?? datagram.get_data());
sent += datagram.length;
if (sent > sent_reported + 100000) {
debug("Sent %lu bytes via stream %u component %u", sent, stream_id, component_id);
sent_reported = sent;
}
}
}
}
public TransportParameters(Nice.Agent agent, Xep.ExternalServiceDiscovery.Service? turn_service, string? turn_ip, uint8 components, Jid local_full_jid, Jid peer_full_jid, StanzaNode? node = null) {
base(components, local_full_jid, peer_full_jid, node);
this.we_want_connection = (node == null);
this.agent = agent;
if (this.peer_fingerprint != null || !incoming) {
dtls_srtp_handler = setup_dtls(this);
own_fingerprint = dtls_srtp_handler.own_fingerprint;
if (incoming) {
own_setup = "active";
dtls_srtp_handler.mode = DtlsSrtp.Mode.CLIENT;
dtls_srtp_handler.peer_fingerprint = peer_fingerprint;
dtls_srtp_handler.peer_fp_algo = peer_fp_algo;
} else {
own_setup = "actpass";
dtls_srtp_handler.mode = DtlsSrtp.Mode.SERVER;
dtls_srtp_handler.setup_dtls_connection.begin((_, res) => {
this.content.encryption = dtls_srtp_handler.setup_dtls_connection.end(res) ?? this.content.encryption;
});
}
}
agent.candidate_gathering_done.connect(on_candidate_gathering_done);
agent.initial_binding_request_received.connect(on_initial_binding_request_received);
agent.component_state_changed.connect(on_component_state_changed);
agent.new_selected_pair_full.connect(on_new_selected_pair_full);
agent.new_candidate_full.connect(on_new_candidate);
agent.controlling_mode = !incoming;
stream_id = agent.add_stream(components);
if (turn_ip != null) {
for (uint8 component_id = 1; component_id <= components; component_id++) {
agent.set_relay_info(stream_id, component_id, turn_ip, turn_service.port, turn_service.username, turn_service.password, Nice.RelayType.UDP);
debug("TURN info (component %i) %s:%u", component_id, turn_ip, turn_service.port);
}
}
string ufrag;
string pwd;
agent.get_local_credentials(stream_id, out ufrag, out pwd);
init(ufrag, pwd);
for (uint8 component_id = 1; component_id <= components; component_id++) {
// We don't properly get local candidates before this call
agent.attach_recv(stream_id, component_id, MainContext.@default(), on_recv);
}
agent.gather_candidates(stream_id);
}
private static DtlsSrtp.Handler setup_dtls(TransportParameters tp) {
var weak_self = WeakRef(tp);
DtlsSrtp.Handler dtls_srtp = DtlsSrtp.setup();
dtls_srtp.send_data.connect((data) => {
TransportParameters self = (TransportParameters) weak_self.get();
if (self != null) self.agent.send(self.stream_id, 1, data);
});
return dtls_srtp;
}
private void on_candidate_gathering_done(uint stream_id) {
if (stream_id != this.stream_id) return;
debug("on_candidate_gathering_done in %u", stream_id);
for (uint8 i = 1; i <= components; i++) {
foreach (unowned Nice.Candidate nc in agent.get_local_candidates(stream_id, i)) {
if (nc.transport == Nice.CandidateTransport.UDP) {
JingleIceUdp.Candidate? candidate = candidate_to_jingle(nc);
if (candidate == null) continue;
debug("Local candidate summary: %s", agent.generate_local_candidate_sdp(nc));
}
}
}
}
private void on_new_candidate(Nice.Candidate nc) {
if (nc.stream_id != stream_id) return;
JingleIceUdp.Candidate? candidate = candidate_to_jingle(nc);
if (candidate == null) return;
if (nc.transport == Nice.CandidateTransport.UDP) {
// Execution was in the agent thread before
add_local_candidate_threadsafe(candidate);
}
}
public override void handle_transport_accept(StanzaNode transport) throws Jingle.IqError {
debug("on_transport_accept from %s", peer_full_jid.to_string());
base.handle_transport_accept(transport);
if (dtls_srtp_handler != null && peer_fingerprint != null) {
dtls_srtp_handler.peer_fingerprint = peer_fingerprint;
dtls_srtp_handler.peer_fp_algo = peer_fp_algo;
if (peer_setup == "passive") {
dtls_srtp_handler.mode = DtlsSrtp.Mode.CLIENT;
dtls_srtp_handler.stop_dtls_connection();
dtls_srtp_handler.setup_dtls_connection.begin((_, res) => {
this.content.encryption = dtls_srtp_handler.setup_dtls_connection.end(res) ?? this.content.encryption;
});
}
} else {
dtls_srtp_handler = null;
}
}
public override void handle_transport_info(StanzaNode transport) throws Jingle.IqError {
debug("on_transport_info from %s", peer_full_jid.to_string());
base.handle_transport_info(transport);
if (!we_want_connection) return;
if (remote_ufrag != null && remote_pwd != null && !remote_credentials_set) {
agent.set_remote_credentials(stream_id, remote_ufrag, remote_pwd);
remote_credentials_set = true;
}
for (uint8 i = 1; i <= components; i++) {
SList<Nice.Candidate> candidates = new SList<Nice.Candidate>();
foreach (JingleIceUdp.Candidate candidate in remote_candidates) {
if (candidate.component == i) {
candidates.append(candidate_to_nice(candidate));
}
}
int new_candidates = agent.set_remote_candidates(stream_id, i, candidates);
debug("Updated to %i remote candidates for candidate %u via transport info", new_candidates, i);
}
}
public override void create_transport_connection(XmppStream stream, Jingle.Content content) {
debug("create_transport_connection: %s", content.session.sid);
debug("local_credentials: %s %s", local_ufrag, local_pwd);
debug("remote_credentials: %s %s", remote_ufrag, remote_pwd);
debug("expected incoming credentials: %s %s", local_ufrag + ":" + remote_ufrag, local_pwd);
debug("expected outgoing credentials: %s %s", remote_ufrag + ":" + local_ufrag, remote_pwd);
we_want_connection = true;
if (remote_ufrag != null && remote_pwd != null && !remote_credentials_set) {
agent.set_remote_credentials(stream_id, remote_ufrag, remote_pwd);
remote_credentials_set = true;
}
for (uint8 i = 1; i <= components; i++) {
SList<Nice.Candidate> candidates = new SList<Nice.Candidate>();
foreach (JingleIceUdp.Candidate candidate in remote_candidates) {
if (candidate.ip.has_prefix("fe80::")) continue;
if (candidate.component == i) {
candidates.append(candidate_to_nice(candidate));
debug("remote candidate: %s", agent.generate_local_candidate_sdp(candidate_to_nice(candidate)));
}
}
int new_candidates = agent.set_remote_candidates(stream_id, i, candidates);
debug("Initiated component %u with %i remote candidates", i, new_candidates);
connections[i] = new DatagramConnection(agent, dtls_srtp_handler, stream_id, i);
content.set_transport_connection(connections[i], i);
}
base.create_transport_connection(stream, content);
}
private void on_component_state_changed(uint stream_id, uint component_id, uint state) {
if (stream_id != this.stream_id) return;
debug("stream %u component %u state changed to %s", stream_id, component_id, agent.get_component_state(stream_id, component_id).to_string());
may_consider_ready(stream_id, component_id);
if (incoming && dtls_srtp_handler != null && !dtls_srtp_handler.ready && is_component_ready(agent, stream_id, component_id) && dtls_srtp_handler.mode == DtlsSrtp.Mode.CLIENT) {
dtls_srtp_handler.setup_dtls_connection.begin((_, res) => {
this.content.encryption = dtls_srtp_handler.setup_dtls_connection.end(res) ?? this.content.encryption;
});
}
}
private void may_consider_ready(uint stream_id, uint component_id) {
if (stream_id != this.stream_id) return;
if (connections.has_key((uint8) component_id) && !connections[(uint8)component_id].ready && is_component_ready(agent, stream_id, component_id) && (dtls_srtp_handler == null || dtls_srtp_handler.ready)) {
connections[(uint8)component_id].ready = true;
}
}
private void on_initial_binding_request_received(uint stream_id) {
if (stream_id != this.stream_id) return;
debug("initial_binding_request_received");
}
private void on_new_selected_pair_full(uint stream_id, uint component_id, Nice.Candidate p1, Nice.Candidate p2) {
if (stream_id != this.stream_id) return;
debug("new_selected_pair_full %u [%s, %s]", component_id, agent.generate_local_candidate_sdp(p1), agent.generate_local_candidate_sdp(p2));
}
private void on_recv(Nice.Agent agent, uint stream_id, uint component_id, uint8[] data) {
if (stream_id != this.stream_id) return;
uint8[] decrypt_data = null;
if (dtls_srtp_handler != null) {
decrypt_data = dtls_srtp_handler.process_incoming_data(component_id, data);
if (decrypt_data == null) return;
}
may_consider_ready(stream_id, component_id);
if (connections.has_key((uint8) component_id)) {
if (!connections[(uint8) component_id].ready) {
debug("on_recv stream %u component %u when state %s", stream_id, component_id, agent.get_component_state(stream_id, component_id).to_string());
}
connections[(uint8) component_id].datagram_received(new Bytes(decrypt_data ?? data));
} else {
debug("on_recv stream %u component %u length %u", stream_id, component_id, data.length);
}
}
private static Nice.Candidate candidate_to_nice(JingleIceUdp.Candidate c) {
Nice.CandidateType type;
switch (c.type_) {
case JingleIceUdp.Candidate.Type.HOST: type = Nice.CandidateType.HOST; break;
case JingleIceUdp.Candidate.Type.PRFLX: type = Nice.CandidateType.PEER_REFLEXIVE; break;
case JingleIceUdp.Candidate.Type.RELAY: type = Nice.CandidateType.RELAYED; break;
case JingleIceUdp.Candidate.Type.SRFLX: type = Nice.CandidateType.SERVER_REFLEXIVE; break;
default: assert_not_reached();
}
Nice.Candidate candidate = new Nice.Candidate(type);
candidate.component_id = c.component;
char[] foundation = new char[Nice.CANDIDATE_MAX_FOUNDATION];
Memory.copy(foundation, c.foundation.data, size_t.min(c.foundation.length, Nice.CANDIDATE_MAX_FOUNDATION - 1));
candidate.foundation = foundation;
candidate.addr = Nice.Address();
candidate.addr.init();
candidate.addr.set_from_string(c.ip);
candidate.addr.set_port(c.port);
candidate.priority = c.priority;
if (c.rel_addr != null) {
candidate.base_addr = Nice.Address();
candidate.base_addr.init();
candidate.base_addr.set_from_string(c.rel_addr);
candidate.base_addr.set_port(c.rel_port);
}
candidate.transport = Nice.CandidateTransport.UDP;
return candidate;
}
private static JingleIceUdp.Candidate? candidate_to_jingle(Nice.Candidate nc) {
JingleIceUdp.Candidate candidate = new JingleIceUdp.Candidate();
switch (nc.type) {
case Nice.CandidateType.HOST: candidate.type_ = JingleIceUdp.Candidate.Type.HOST; break;
case Nice.CandidateType.PEER_REFLEXIVE: candidate.type_ = JingleIceUdp.Candidate.Type.PRFLX; break;
case Nice.CandidateType.RELAYED: candidate.type_ = JingleIceUdp.Candidate.Type.RELAY; break;
case Nice.CandidateType.SERVER_REFLEXIVE: candidate.type_ = JingleIceUdp.Candidate.Type.SRFLX; break;
default: assert_not_reached();
}
candidate.component = (uint8) nc.component_id;
candidate.foundation = ((string)nc.foundation).dup();
candidate.generation = 0;
candidate.id = Random.next_int().to_string("%08x"); // TODO
char[] res = new char[NICE_ADDRESS_STRING_LEN];
nc.addr.to_string(res);
candidate.ip = (string) res;
candidate.network = 0; // TODO
candidate.port = (uint16) nc.addr.get_port();
candidate.priority = nc.priority;
candidate.protocol = "udp";
if (nc.base_addr.is_valid() && !nc.base_addr.equal(nc.addr)) {
res = new char[NICE_ADDRESS_STRING_LEN];
nc.base_addr.to_string(res);
candidate.rel_addr = (string) res;
candidate.rel_port = (uint16) nc.base_addr.get_port();
}
if (candidate.ip.has_prefix("fe80::")) return null;
return candidate;
}
public override void dispose() {
base.dispose();
agent = null;
dtls_srtp_handler = null;
connections.clear();
}
}
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