Add libnice and listen for direct connections in Jingle SOCKS5 (#608)

Add libnice as a plugin. If it is present, use libnice to enumerate
local IP addresses and listen on them to support direct connections for
Jingle SOCKS5.

Tested with Conversations and Gajim.

Created the nice.vapi file using
```
vapigen --library nice --pkg gio-2.0 --metadatadir metadata /usr/share/gir-1.0/Nice-0.1.gir
```

5 files changed, 452 insertions, 0 deletions

diff --git a/plugins/ice/CMakeLists.txt b/plugins/ice/CMakeLists.txt
new file mode 100644
index 00000000..76dba28f
--- /dev/null
+++ b/plugins/ice/CMakeLists.txt
@@ -0,0 +1,30 @@
+find_packages(ICE_PACKAGES REQUIRED
+    Gee
+    GLib
+    GModule
+    GObject
+    GTK3
+    Nice
+)
+
+vala_precompile(ICE_VALA_C
+SOURCES
+    src/plugin.vala
+    src/register_plugin.vala
+CUSTOM_VAPIS
+    ${CMAKE_BINARY_DIR}/exports/xmpp-vala.vapi
+    ${CMAKE_BINARY_DIR}/exports/dino.vapi
+    ${CMAKE_BINARY_DIR}/exports/qlite.vapi
+PACKAGES
+    ${ICE_PACKAGES}
+OPTIONS
+    --vapidir=${CMAKE_CURRENT_SOURCE_DIR}/vapi
+)
+
+add_definitions(${VALA_CFLAGS})
+add_library(ice SHARED ${ICE_VALA_C})
+target_link_libraries(ice libdino ${ICE_PACKAGES})
+set_target_properties(ice PROPERTIES PREFIX "")
+set_target_properties(ice PROPERTIES LIBRARY_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR}/plugins/)
+
+install(TARGETS ice ${PLUGIN_INSTALL})
diff --git a/plugins/ice/src/plugin.vala b/plugins/ice/src/plugin.vala
new file mode 100644
index 00000000..f1c41a27
--- /dev/null
+++ b/plugins/ice/src/plugin.vala
@@ -0,0 +1,30 @@
+using Gee;
+using Nice;
+using Xmpp;
+
+namespace Dino.Plugins.Ice {
+
+public class Plugin : RootInterface, Object {
+    public Dino.Application app;
+
+    public void registered(Dino.Application app) {
+        this.app = app;
+        app.stream_interactor.stream_attached_modules.connect((account, stream) => {
+            stream.get_module(Xmpp.Xep.Socks5Bytestreams.Module.IDENTITY).set_local_ip_address_handler(get_local_ip_addresses);
+        });
+    }
+
+    private Gee.List<string> get_local_ip_addresses() {
+        Gee.List<string> result = new ArrayList<string>();
+        foreach (string ip_address in Nice.interfaces_get_local_ips(false)) {
+            result.add(ip_address);
+        }
+        return result;
+    }
+
+    public void shutdown() {
+        // Nothing to do
+    }
+}
+
+}
diff --git a/plugins/ice/src/register_plugin.vala b/plugins/ice/src/register_plugin.vala
new file mode 100644
index 00000000..b2ed56c1
--- /dev/null
+++ b/plugins/ice/src/register_plugin.vala
@@ -0,0 +1,3 @@
+public Type register_plugin(Module module) {
+    return typeof (Dino.Plugins.Ice.Plugin);
+}
diff --git a/plugins/ice/vapi/metadata/Nice-0.1.metadata b/plugins/ice/vapi/metadata/Nice-0.1.metadata
new file mode 100644
index 00000000..437da816
--- /dev/null
+++ b/plugins/ice/vapi/metadata/Nice-0.1.metadata
@@ -0,0 +1,4 @@
+Nice cheader_filename="nice.h"
+Agent.new_reliable#constructor name="create_reliable"
+PseudoTcpCallbacks#record skip
+PseudoTcpSocket#class skip
diff --git a/plugins/ice/vapi/nice.vapi b/plugins/ice/vapi/nice.vapi
new file mode 100644
index 00000000..aa45cf08
--- /dev/null
+++ b/plugins/ice/vapi/nice.vapi
@@ -0,0 +1,385 @@
+/* nice.vapi generated by vapigen, do not modify. */
+
+[CCode (cprefix = "Nice", gir_namespace = "Nice", gir_version = "0.1", lower_case_cprefix = "nice_")]
+namespace Nice {
+	[CCode (cheader_filename = "nice.h", type_id = "nice_agent_get_type ()")]
+	public class Agent : GLib.Object {
+		[CCode (has_construct_function = false)]
+		public Agent (GLib.MainContext ctx, Nice.Compatibility compat);
+		public bool add_local_address (Nice.Address addr);
+		public uint add_stream (uint n_components);
+		[Version (since = "0.1.16")]
+		public async void close_async ();
+		[CCode (cname = "nice_agent_new_reliable", has_construct_function = false)]
+		[Version (since = "0.0.11")]
+		public Agent.create_reliable (GLib.MainContext ctx, Nice.Compatibility compat);
+		[Version (since = "0.1.6")]
+		public bool forget_relays (uint stream_id, uint component_id);
+		[CCode (has_construct_function = false)]
+		[Version (since = "0.1.15")]
+		public Agent.full (GLib.MainContext ctx, Nice.Compatibility compat, Nice.AgentOption flags);
+		public bool gather_candidates (uint stream_id);
+		[Version (since = "0.1.4")]
+		public string generate_local_candidate_sdp (Nice.Candidate candidate);
+		[Version (since = "0.1.4")]
+		public string generate_local_sdp ();
+		[Version (since = "0.1.4")]
+		public string generate_local_stream_sdp (uint stream_id, bool include_non_ice);
+		[Version (since = "0.1.8")]
+		public Nice.ComponentState get_component_state (uint stream_id, uint component_id);
+		public Nice.Candidate get_default_local_candidate (uint stream_id, uint component_id);
+		[Version (since = "0.1.5")]
+		public GLib.IOStream get_io_stream (uint stream_id, uint component_id);
+		public GLib.SList<Nice.Candidate> get_local_candidates (uint stream_id, uint component_id);
+		public bool get_local_credentials (uint stream_id, out string ufrag, out string pwd);
+		public GLib.SList<Nice.Candidate> get_remote_candidates (uint stream_id, uint component_id);
+		public bool get_selected_pair (uint stream_id, uint component_id, Nice.Candidate local, Nice.Candidate remote);
+		[Version (since = "0.1.5")]
+		public GLib.Socket? get_selected_socket (uint stream_id, uint component_id);
+		[Version (since = "0.1.4")]
+		public unowned string get_stream_name (uint stream_id);
+		[Version (since = "0.1.4")]
+		public Nice.Candidate parse_remote_candidate_sdp (uint stream_id, string sdp);
+		[Version (since = "0.1.4")]
+		public int parse_remote_sdp (string sdp);
+		[Version (since = "0.1.4")]
+		public GLib.SList<Nice.Candidate> parse_remote_stream_sdp (uint stream_id, string sdp, string ufrag, string pwd);
+		[Version (since = "0.1.16")]
+		public bool peer_candidate_gathering_done (uint stream_id);
+		[Version (since = "0.1.5")]
+		public ssize_t recv (uint stream_id, uint component_id, [CCode (array_length_cname = "buf_len", array_length_pos = 3.5, array_length_type = "gsize")] out unowned uint8[] buf, GLib.Cancellable? cancellable = null) throws GLib.Error;
+		[Version (since = "0.1.5")]
+		public int recv_messages (uint stream_id, uint component_id, [CCode (array_length_cname = "n_messages", array_length_pos = 3.5, array_length_type = "guint")] out unowned Nice.InputMessage[] messages, GLib.Cancellable? cancellable = null) throws GLib.Error;
+		[Version (since = "0.1.5")]
+		public int recv_messages_nonblocking (uint stream_id, uint component_id, [CCode (array_length_cname = "n_messages", array_length_pos = 3.5, array_length_type = "guint")] out unowned Nice.InputMessage[] messages, GLib.Cancellable? cancellable = null) throws GLib.Error;
+		[Version (since = "0.1.5")]
+		public ssize_t recv_nonblocking (uint stream_id, uint component_id, [CCode (array_length_cname = "buf_len", array_length_pos = 3.5, array_length_type = "gsize")] out unowned uint8[] buf, GLib.Cancellable? cancellable = null) throws GLib.Error;
+		public void remove_stream (uint stream_id);
+		public bool restart ();
+		[Version (since = "0.1.6")]
+		public bool restart_stream (uint stream_id);
+		public int send (uint stream_id, uint component_id, uint len, string buf);
+		[Version (since = "0.1.5")]
+		public int send_messages_nonblocking (uint stream_id, uint component_id, [CCode (array_length_cname = "n_messages", array_length_pos = 3.5, array_length_type = "guint")] Nice.OutputMessage[] messages, GLib.Cancellable? cancellable = null) throws GLib.Error;
+		public bool set_local_credentials (uint stream_id, string ufrag, string pwd);
+		public void set_port_range (uint stream_id, uint component_id, uint min_port, uint max_port);
+		public bool set_relay_info (uint stream_id, uint component_id, string server_ip, uint server_port, string username, string password, Nice.RelayType type);
+		public int set_remote_candidates (uint stream_id, uint component_id, GLib.SList<Nice.Candidate> candidates);
+		public bool set_remote_credentials (uint stream_id, string ufrag, string pwd);
+		public bool set_selected_pair (uint stream_id, uint component_id, string lfoundation, string rfoundation);
+		public bool set_selected_remote_candidate (uint stream_id, uint component_id, Nice.Candidate candidate);
+		[Version (since = "0.0.10")]
+		public void set_software (string software);
+		[Version (since = "0.1.4")]
+		public bool set_stream_name (uint stream_id, string name);
+		[Version (since = "0.0.9")]
+		public void set_stream_tos (uint stream_id, int tos);
+		[NoAccessorMethod]
+		[Version (since = "0.1.8")]
+		public bool bytestream_tcp { get; }
+		[NoAccessorMethod]
+		public uint compatibility { get; construct; }
+		[NoAccessorMethod]
+		public bool controlling_mode { get; set; }
+		[NoAccessorMethod]
+		[Version (since = "0.1.14")]
+		public bool force_relay { get; set; }
+		[NoAccessorMethod]
+		public bool full_mode { get; construct; }
+		[NoAccessorMethod]
+		[Version (since = "0.1.8")]
+		public bool ice_tcp { get; set; }
+		[NoAccessorMethod]
+		[Version (since = "0.1.16")]
+		public bool ice_trickle { get; set; }
+		[NoAccessorMethod]
+		[Version (since = "0.1.8")]
+		public bool ice_udp { get; set; }
+		[NoAccessorMethod]
+		[Version (since = "0.1.8")]
+		public bool keepalive_conncheck { get; set; }
+		[NoAccessorMethod]
+		public void* main_context { get; construct; }
+		[NoAccessorMethod]
+		public uint max_connectivity_checks { get; set; }
+		[NoAccessorMethod]
+		[Version (since = "0.0.4")]
+		public string proxy_ip { owned get; set; }
+		[NoAccessorMethod]
+		[Version (since = "0.0.4")]
+		public string proxy_password { owned get; set; }
+		[NoAccessorMethod]
+		[Version (since = "0.0.4")]
+		public uint proxy_port { get; set; }
+		[NoAccessorMethod]
+		[Version (since = "0.0.4")]
+		public uint proxy_type { get; set; }
+		[NoAccessorMethod]
+		[Version (since = "0.0.4")]
+		public string proxy_username { owned get; set; }
+		[NoAccessorMethod]
+		[Version (since = "0.0.11")]
+		public bool reliable { get; construct; }
+		[NoAccessorMethod]
+		[Version (since = "0.1.15")]
+		public uint stun_initial_timeout { get; set construct; }
+		[NoAccessorMethod]
+		[Version (since = "0.1.15")]
+		public uint stun_max_retransmissions { get; set construct; }
+		[NoAccessorMethod]
+		public uint stun_pacing_timer { get; set construct; }
+		[NoAccessorMethod]
+		[Version (since = "0.1.15")]
+		public uint stun_reliable_timeout { get; set construct; }
+		[NoAccessorMethod]
+		public string stun_server { owned get; set; }
+		[NoAccessorMethod]
+		public uint stun_server_port { get; set; }
+		[NoAccessorMethod]
+		public bool support_renomination { get; set; }
+		[NoAccessorMethod]
+		[Version (since = "0.0.7")]
+		public bool upnp { get; set construct; }
+		[NoAccessorMethod]
+		[Version (since = "0.0.7")]
+		public uint upnp_timeout { get; set construct; }
+		public signal void candidate_gathering_done (uint stream_id);
+		public signal void component_state_changed (uint stream_id, uint component_id, uint state);
+		public signal void initial_binding_request_received (uint stream_id);
+		[Version (deprecated = true, deprecated_since = "0.1.8")]
+		public signal void new_candidate (uint stream_id, uint component_id, string foundation);
+		[Version (since = "0.1.8")]
+		public signal void new_candidate_full (Nice.Candidate candidate);
+		[Version (deprecated = true, deprecated_since = "0.1.8")]
+		public signal void new_remote_candidate (uint stream_id, uint component_id, string foundation);
+		[Version (since = "0.1.8")]
+		public signal void new_remote_candidate_full (Nice.Candidate candidate);
+		[Version (deprecated = true, deprecated_since = "0.1.8")]
+		public signal void new_selected_pair (uint stream_id, uint component_id, string lfoundation, string rfoundation);
+		[Version (since = "0.1.8")]
+		public signal void new_selected_pair_full (uint stream_id, uint component_id, Nice.Candidate lcandidate, Nice.Candidate rcandidate);
+		[Version (since = "0.0.11")]
+		public signal void reliable_transport_writable (uint stream_id, uint component_id);
+		[Version (since = "0.1.5")]
+		public signal void streams_removed ([CCode (array_length = false, array_null_terminated = true)] uint[] stream_ids);
+	}
+	[CCode (cheader_filename = "nice.h", copy_function = "g_boxed_copy", free_function = "g_boxed_free", type_id = "nice_candidate_get_type ()")]
+	[Compact]
+	public class Candidate {
+		public Nice.Address addr;
+		public Nice.Address base_addr;
+		public uint component_id;
+		[CCode (array_length = false)]
+		public weak char foundation[33];
+		public weak string password;
+		public uint32 priority;
+		public void* sockptr;
+		public uint stream_id;
+		public Nice.CandidateTransport transport;
+		public Nice.TurnServer turn;
+		public Nice.CandidateType type;
+		public weak string username;
+		[CCode (has_construct_function = false)]
+		public Candidate (Nice.CandidateType type);
+		public Nice.Candidate copy ();
+		[Version (since = "0.1.15")]
+		public bool equal_target (Nice.Candidate candidate2);
+		public void free ();
+	}
+	[CCode (cheader_filename = "nice.h", has_type_id = false)]
+	public struct Address {
+		[CCode (cname = "s.addr")]
+		public void* s_addr;
+		[CCode (cname = "s.ip4")]
+		public void* s_ip4;
+		[CCode (cname = "s.ip6")]
+		public void* s_ip6;
+		public void copy_to_sockaddr (void* sin);
+		public bool equal (Nice.Address b);
+		[Version (since = "0.1.8")]
+		public bool equal_no_port (Nice.Address b);
+		public void free ();
+		public uint get_port ();
+		public void init ();
+		public int ip_version ();
+		public bool is_private ();
+		public bool is_valid ();
+		public void set_from_sockaddr (void* sin);
+		public bool set_from_string (string str);
+		public void set_ipv4 (uint32 addr_ipv4);
+		public void set_ipv6 (uint8 addr_ipv6);
+		public void set_port (uint port);
+		public void to_string (string dst);
+	}
+	[CCode (cheader_filename = "nice.h", has_type_id = false)]
+	[Version (since = "0.1.5")]
+	public struct InputMessage {
+		[CCode (array_length_cname = "n_buffers")]
+		public weak GLib.InputVector[] buffers;
+		public int n_buffers;
+		public Nice.Address from;
+		public size_t length;
+	}
+	[CCode (cheader_filename = "nice.h", has_type_id = false)]
+	[Version (since = "0.1.5")]
+	public struct OutputMessage {
+		[CCode (array_length_cname = "n_buffers")]
+		public weak GLib.OutputVector[] buffers;
+		public int n_buffers;
+	}
+	[CCode (cheader_filename = "nice.h", cname = "TurnServer", has_type_id = false)]
+	public struct TurnServer {
+		public int ref_count;
+		public Nice.Address server;
+		public weak string username;
+		public weak string password;
+		public Nice.RelayType type;
+	}
+	[CCode (cheader_filename = "nice.h", cprefix = "NICE_AGENT_OPTION_", has_type_id = false)]
+	[Flags]
+	[Version (since = "0.1.15")]
+	public enum AgentOption {
+		REGULAR_NOMINATION,
+		RELIABLE,
+		LITE_MODE,
+		ICE_TRICKLE,
+		SUPPORT_RENOMINATION
+	}
+	[CCode (cheader_filename = "nice.h", cprefix = "NICE_CANDIDATE_TRANSPORT_", has_type_id = false)]
+	public enum CandidateTransport {
+		UDP,
+		TCP_ACTIVE,
+		TCP_PASSIVE,
+		TCP_SO
+	}
+	[CCode (cheader_filename = "nice.h", cprefix = "NICE_CANDIDATE_TYPE_", has_type_id = false)]
+	public enum CandidateType {
+		HOST,
+		SERVER_REFLEXIVE,
+		PEER_REFLEXIVE,
+		RELAYED
+	}
+	[CCode (cheader_filename = "nice.h", cprefix = "NICE_COMPATIBILITY_", has_type_id = false)]
+	public enum Compatibility {
+		RFC5245,
+		DRAFT19,
+		GOOGLE,
+		MSN,
+		WLM2009,
+		OC2007,
+		OC2007R2,
+		LAST
+	}
+	[CCode (cheader_filename = "nice.h", cprefix = "NICE_COMPONENT_STATE_", has_type_id = false)]
+	public enum ComponentState {
+		DISCONNECTED,
+		GATHERING,
+		CONNECTING,
+		CONNECTED,
+		READY,
+		FAILED,
+		LAST;
+		[Version (since = "0.1.6")]
+		public unowned string to_string ();
+	}
+	[CCode (cheader_filename = "nice.h", cprefix = "NICE_COMPONENT_TYPE_", has_type_id = false)]
+	public enum ComponentType {
+		RTP,
+		RTCP
+	}
+	[CCode (cheader_filename = "nice.h", cprefix = "NICE_NOMINATION_MODE_", has_type_id = false)]
+	[Version (since = "0.1.15")]
+	public enum NominationMode {
+		REGULAR,
+		AGGRESSIVE
+	}
+	[CCode (cheader_filename = "nice.h", cprefix = "NICE_PROXY_TYPE_", has_type_id = false)]
+	[Version (since = "0.0.4")]
+	public enum ProxyType {
+		NONE,
+		SOCKS5,
+		HTTP,
+		LAST
+	}
+	[CCode (cheader_filename = "nice.h", cname = "PseudoTcpDebugLevel", cprefix = "PSEUDO_TCP_DEBUG_", has_type_id = false)]
+	[Version (since = "0.0.11")]
+	public enum PseudoTcpDebugLevel {
+		NONE,
+		NORMAL,
+		VERBOSE
+	}
+	[CCode (cheader_filename = "nice.h", cname = "PseudoTcpShutdown", cprefix = "PSEUDO_TCP_SHUTDOWN_", has_type_id = false)]
+	[Version (since = "0.1.8")]
+	public enum PseudoTcpShutdown {
+		RD,
+		WR,
+		RDWR
+	}
+	[CCode (cheader_filename = "nice.h", cname = "PseudoTcpState", cprefix = "PSEUDO_TCP_", has_type_id = false)]
+	[Version (since = "0.0.11")]
+	public enum PseudoTcpState {
+		LISTEN,
+		SYN_SENT,
+		SYN_RECEIVED,
+		ESTABLISHED,
+		CLOSED,
+		FIN_WAIT_1,
+		FIN_WAIT_2,
+		CLOSING,
+		TIME_WAIT,
+		CLOSE_WAIT,
+		LAST_ACK
+	}
+	[CCode (cheader_filename = "nice.h", cname = "PseudoTcpWriteResult", cprefix = "WR_", has_type_id = false)]
+	[Version (since = "0.0.11")]
+	public enum PseudoTcpWriteResult {
+		SUCCESS,
+		TOO_LARGE,
+		FAIL
+	}
+	[CCode (cheader_filename = "nice.h", cprefix = "NICE_RELAY_TYPE_TURN_", has_type_id = false)]
+	public enum RelayType {
+		UDP,
+		TCP,
+		TLS
+	}
+	[CCode (cheader_filename = "nice.h", instance_pos = 5.9)]
+	public delegate void AgentRecvFunc (Nice.Agent agent, uint stream_id, uint component_id, uint len, string buf);
+	[CCode (cheader_filename = "nice.h", cname = "NICE_AGENT_MAX_REMOTE_CANDIDATES")]
+	public const int AGENT_MAX_REMOTE_CANDIDATES;
+	[CCode (cheader_filename = "nice.h", cname = "NICE_CANDIDATE_DIRECTION_MS_PREF_ACTIVE")]
+	public const int CANDIDATE_DIRECTION_MS_PREF_ACTIVE;
+	[CCode (cheader_filename = "nice.h", cname = "NICE_CANDIDATE_DIRECTION_MS_PREF_PASSIVE")]
+	public const int CANDIDATE_DIRECTION_MS_PREF_PASSIVE;
+	[CCode (cheader_filename = "nice.h", cname = "NICE_CANDIDATE_MAX_FOUNDATION")]
+	public const int CANDIDATE_MAX_FOUNDATION;
+	[CCode (cheader_filename = "nice.h", cname = "NICE_CANDIDATE_TRANSPORT_MS_PREF_TCP")]
+	public const int CANDIDATE_TRANSPORT_MS_PREF_TCP;
+	[CCode (cheader_filename = "nice.h", cname = "NICE_CANDIDATE_TRANSPORT_MS_PREF_UDP")]
+	public const int CANDIDATE_TRANSPORT_MS_PREF_UDP;
+	[CCode (cheader_filename = "nice.h", cname = "NICE_CANDIDATE_TYPE_PREF_HOST")]
+	public const int CANDIDATE_TYPE_PREF_HOST;
+	[CCode (cheader_filename = "nice.h", cname = "NICE_CANDIDATE_TYPE_PREF_NAT_ASSISTED")]
+	public const int CANDIDATE_TYPE_PREF_NAT_ASSISTED;
+	[CCode (cheader_filename = "nice.h", cname = "NICE_CANDIDATE_TYPE_PREF_PEER_REFLEXIVE")]
+	public const int CANDIDATE_TYPE_PREF_PEER_REFLEXIVE;
+	[CCode (cheader_filename = "nice.h", cname = "NICE_CANDIDATE_TYPE_PREF_RELAYED")]
+	public const int CANDIDATE_TYPE_PREF_RELAYED;
+	[CCode (cheader_filename = "nice.h", cname = "NICE_CANDIDATE_TYPE_PREF_RELAYED_UDP")]
+	public const int CANDIDATE_TYPE_PREF_RELAYED_UDP;
+	[CCode (cheader_filename = "nice.h", cname = "NICE_CANDIDATE_TYPE_PREF_SERVER_REFLEXIVE")]
+	public const int CANDIDATE_TYPE_PREF_SERVER_REFLEXIVE;
+	[CCode (cheader_filename = "nice.h")]
+	public static void debug_disable (bool with_stun);
+	[CCode (cheader_filename = "nice.h")]
+	public static void debug_enable (bool with_stun);
+	[CCode (cheader_filename = "nice.h")]
+	public static string? interfaces_get_ip_for_interface (string interface_name);
+	[CCode (cheader_filename = "nice.h")]
+	public static GLib.List<string> interfaces_get_local_interfaces ();
+	[CCode (cheader_filename = "nice.h")]
+	public static GLib.List<string> interfaces_get_local_ips (bool include_loopback);
+	[CCode (cheader_filename = "nice.h", cname = "pseudo_tcp_set_debug_level")]
+	[Version (since = "0.0.11")]
+	public static void pseudo_tcp_set_debug_level (Nice.PseudoTcpDebugLevel level);
+}