7 files changed, 407 insertions, 0 deletions
diff --git a/vendor/github.com/pion/udp/.gitignore b/vendor/github.com/pion/udp/.gitignore
new file mode 100644
index 0000000..f7b3492
--- /dev/null
+++ b/vendor/github.com/pion/udp/.gitignore
@@ -0,0 +1,15 @@
+# Binaries for programs and plugins
+*.exe
+*.exe~
+*.dll
+*.so
+*.dylib
+
+# Test binary, built with `go test -c`
+*.test
+
+# Output of the go coverage tool, specifically when used with LiteIDE
+*.out
+
+# Dependency directories (remove the comment below to include it)
+# vendor/
+\ No newline at end of file
diff --git a/vendor/github.com/pion/udp/.golangci.yml b/vendor/github.com/pion/udp/.golangci.yml
new file mode 100644
index 0000000..1387b55
--- /dev/null
+++ b/vendor/github.com/pion/udp/.golangci.yml
@@ -0,0 +1,12 @@
+linters-settings:
+  govet:
+    check-shadowing: true
+  misspell:
+    locale: US
+
+linters:
+  enable-all: true
+  disable:
+
+issues:
+  exclude-use-default: false
diff --git a/vendor/github.com/pion/udp/LICENSE b/vendor/github.com/pion/udp/LICENSE
new file mode 100644
index 0000000..81f990d
--- /dev/null
+++ b/vendor/github.com/pion/udp/LICENSE
@@ -0,0 +1,21 @@
+MIT License
+
+Copyright (c) 2020
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
diff --git a/vendor/github.com/pion/udp/README.md b/vendor/github.com/pion/udp/README.md
new file mode 100644
index 0000000..f96659f
--- /dev/null
+++ b/vendor/github.com/pion/udp/README.md
@@ -0,0 +1,39 @@
+<h1 align="center">
+  <br>
+  Pion UDP
+  <br>
+</h1>
+<h4 align="center">A connection-oriented listener over a UDP PacketConn</h4>
+<p align="center">
+  <a href="https://pion.ly"><img src="https://img.shields.io/badge/pion-udp-gray.svg?longCache=true&colorB=brightgreen" alt="Pion UDP"></a>
+  <!--<a href="https://sourcegraph.com/github.com/pion/webrtc?badge"><img src="https://sourcegraph.com/github.com/pion/webrtc/-/badge.svg" alt="Sourcegraph Widget"></a>-->
+  <a href="https://pion.ly/slack"><img src="https://img.shields.io/badge/join-us%20on%20slack-gray.svg?longCache=true&logo=slack&colorB=brightgreen" alt="Slack Widget"></a>
+  <br>
+  <a href="https://travis-ci.org/pion/udp"><img src="https://travis-ci.org/pion/udp.svg?branch=master" alt="Build Status"></a>
+  <a href="https://pkg.go.dev/github.com/pion/udp"><img src="https://godoc.org/github.com/pion/udp?status.svg" alt="GoDoc"></a>
+  <a href="https://codecov.io/gh/pion/udp"><img src="https://codecov.io/gh/pion/udp/branch/master/graph/badge.svg" alt="Coverage Status"></a>
+  <a href="https://goreportcard.com/report/github.com/pion/udp"><img src="https://goreportcard.com/badge/github.com/pion/udp" alt="Go Report Card"></a>
+  <!--<a href="https://www.codacy.com/app/Sean-Der/webrtc"><img src="https://api.codacy.com/project/badge/Grade/18f4aec384894e6aac0b94effe51961d" alt="Codacy Badge"></a>-->
+  <a href="LICENSE"><img src="https://img.shields.io/badge/License-MIT-yellow.svg" alt="License: MIT"></a>
+</p>
+<br>
+
+### Roadmap
+This package is used in the [DTLS](https://github.com/pion/dtls) and [SCTP](https://github.com/pion/sctp) transport to provide a connection-oriented listener over a UDP.
+
+### Community
+Pion has an active community on the [Golang Slack](https://pion.ly/slack/). You can also use [Pion mailing list](https://groups.google.com/forum/#!forum/pion).
+
+We are always looking to support **your projects**. Please reach out if you have something to build!
+
+If you need commercial support or don't want to use public methods you can contact us at [team@pion.ly](mailto:team@pion.ly)
+
+### Contributing
+Check out the **[contributing wiki](https://github.com/pion/webrtc/wiki/Contributing)** to join the group of amazing people making this project possible:
+
+* [Sean DuBois](https://github.com/Sean-Der) - *Original Author*
+* [Michiel De Backker](https://github.com/backkem) - *Original Author*
+* [Atsushi Watanabe](https://github.com/at-wat) - *Original Author*
+
+### License
+MIT License - see [LICENSE](LICENSE) for full text
diff --git a/vendor/github.com/pion/udp/conn.go b/vendor/github.com/pion/udp/conn.go
new file mode 100644
index 0000000..9f680e8
--- /dev/null
+++ b/vendor/github.com/pion/udp/conn.go
@@ -0,0 +1,296 @@
+// Package udp provides a connection-oriented listener over a UDP PacketConn
+package udp
+
+import (
+	"context"
+	"errors"
+	"net"
+	"sync"
+	"sync/atomic"
+	"time"
+
+	"github.com/pion/transport/deadline"
+	"github.com/pion/transport/packetio"
+)
+
+const receiveMTU = 8192
+const defaultListenBacklog = 128 // same as Linux default
+
+var errClosedListener = errors.New("udp: listener closed")
+var errListenQueueExceeded = errors.New("udp: listen queue exceeded")
+
+// listener augments a connection-oriented Listener over a UDP PacketConn
+type listener struct {
+	pConn *net.UDPConn
+
+	accepting    atomic.Value // bool
+	acceptCh     chan *Conn
+	doneCh       chan struct{}
+	doneOnce     sync.Once
+	acceptFilter func([]byte) bool
+
+	connLock sync.Mutex
+	conns    map[string]*Conn
+	connWG   sync.WaitGroup
+
+	readWG   sync.WaitGroup
+	errClose atomic.Value // error
+}
+
+// Accept waits for and returns the next connection to the listener.
+func (l *listener) Accept() (net.Conn, error) {
+	select {
+	case c := <-l.acceptCh:
+		l.connWG.Add(1)
+		return c, nil
+
+	case <-l.doneCh:
+		return nil, errClosedListener
+	}
+}
+
+// Close closes the listener.
+// Any blocked Accept operations will be unblocked and return errors.
+func (l *listener) Close() error {
+	var err error
+	l.doneOnce.Do(func() {
+		l.accepting.Store(false)
+		close(l.doneCh)
+
+		l.connLock.Lock()
+		// Close unaccepted connections
+	L_CLOSE:
+		for {
+			select {
+			case c := <-l.acceptCh:
+				close(c.doneCh)
+				delete(l.conns, c.rAddr.String())
+
+			default:
+				break L_CLOSE
+			}
+		}
+		nConns := len(l.conns)
+		l.connLock.Unlock()
+
+		l.connWG.Done()
+
+		if nConns == 0 {
+			// Wait if this is the final connection
+			l.readWG.Wait()
+			if errClose, ok := l.errClose.Load().(error); ok {
+				err = errClose
+			}
+		} else {
+			err = nil
+		}
+	})
+
+	return err
+}
+
+// Addr returns the listener's network address.
+func (l *listener) Addr() net.Addr {
+	return l.pConn.LocalAddr()
+}
+
+// ListenConfig stores options for listening to an address.
+type ListenConfig struct {
+	// Backlog defines the maximum length of the queue of pending
+	// connections. It is equivalent of the backlog argument of
+	// POSIX listen function.
+	// If a connection request arrives when the queue is full,
+	// the request will be silently discarded, unlike TCP.
+	// Set zero to use default value 128 which is same as Linux default.
+	Backlog int
+
+	// AcceptFilter determines whether the new conn should be made for
+	// the incoming packet. If not set, any packet creates new conn.
+	AcceptFilter func([]byte) bool
+}
+
+// Listen creates a new listener based on the ListenConfig.
+func (lc *ListenConfig) Listen(network string, laddr *net.UDPAddr) (net.Listener, error) {
+	if lc.Backlog == 0 {
+		lc.Backlog = defaultListenBacklog
+	}
+
+	conn, err := net.ListenUDP(network, laddr)
+	if err != nil {
+		return nil, err
+	}
+
+	l := &listener{
+		pConn:        conn,
+		acceptCh:     make(chan *Conn, lc.Backlog),
+		conns:        make(map[string]*Conn),
+		doneCh:       make(chan struct{}),
+		acceptFilter: lc.AcceptFilter,
+	}
+	l.accepting.Store(true)
+	l.connWG.Add(1)
+	l.readWG.Add(2) // wait readLoop and Close execution routine
+
+	go l.readLoop()
+	go func() {
+		l.connWG.Wait()
+		if err := l.pConn.Close(); err != nil {
+			l.errClose.Store(err)
+		}
+		l.readWG.Done()
+	}()
+
+	return l, nil
+}
+
+// Listen creates a new listener using default ListenConfig.
+func Listen(network string, laddr *net.UDPAddr) (net.Listener, error) {
+	return (&ListenConfig{}).Listen(network, laddr)
+}
+
+var readBufferPool = &sync.Pool{
+	New: func() interface{} {
+		buf := make([]byte, receiveMTU)
+		return &buf
+	},
+}
+
+// readLoop has to tasks:
+// 1. Dispatching incoming packets to the correct Conn.
+//    It can therefore not be ended until all Conns are closed.
+// 2. Creating a new Conn when receiving from a new remote.
+func (l *listener) readLoop() {
+	defer l.readWG.Done()
+
+	for {
+		buf := *(readBufferPool.Get().(*[]byte))
+		n, raddr, err := l.pConn.ReadFrom(buf)
+		if err != nil {
+			return
+		}
+		conn, ok, err := l.getConn(raddr, buf[:n])
+		if err != nil {
+			continue
+		}
+		if ok {
+			_, _ = conn.buffer.Write(buf[:n])
+		}
+	}
+}
+
+func (l *listener) getConn(raddr net.Addr, buf []byte) (*Conn, bool, error) {
+	l.connLock.Lock()
+	defer l.connLock.Unlock()
+	conn, ok := l.conns[raddr.String()]
+	if !ok {
+		if !l.accepting.Load().(bool) {
+			return nil, false, errClosedListener
+		}
+		if l.acceptFilter != nil {
+			if !l.acceptFilter(buf) {
+				return nil, false, nil
+			}
+		}
+		conn = l.newConn(raddr)
+		select {
+		case l.acceptCh <- conn:
+			l.conns[raddr.String()] = conn
+		default:
+			return nil, false, errListenQueueExceeded
+		}
+	}
+	return conn, true, nil
+}
+
+// Conn augments a connection-oriented connection over a UDP PacketConn
+type Conn struct {
+	listener *listener
+
+	rAddr net.Addr
+
+	buffer *packetio.Buffer
+
+	doneCh   chan struct{}
+	doneOnce sync.Once
+
+	writeDeadline *deadline.Deadline
+}
+
+func (l *listener) newConn(rAddr net.Addr) *Conn {
+	return &Conn{
+		listener:      l,
+		rAddr:         rAddr,
+		buffer:        packetio.NewBuffer(),
+		doneCh:        make(chan struct{}),
+		writeDeadline: deadline.New(),
+	}
+}
+
+// Read
+func (c *Conn) Read(p []byte) (int, error) {
+	return c.buffer.Read(p)
+}
+
+// Write writes len(p) bytes from p to the DTLS connection
+func (c *Conn) Write(p []byte) (n int, err error) {
+	select {
+	case <-c.writeDeadline.Done():
+		return 0, context.DeadlineExceeded
+	default:
+	}
+	return c.listener.pConn.WriteTo(p, c.rAddr)
+}
+
+// Close closes the conn and releases any Read calls
+func (c *Conn) Close() error {
+	var err error
+	c.doneOnce.Do(func() {
+		c.listener.connWG.Done()
+		close(c.doneCh)
+		c.listener.connLock.Lock()
+		delete(c.listener.conns, c.rAddr.String())
+		nConns := len(c.listener.conns)
+		c.listener.connLock.Unlock()
+
+		if nConns == 0 && !c.listener.accepting.Load().(bool) {
+			// Wait if this is the final connection
+			c.listener.readWG.Wait()
+			if errClose, ok := c.listener.errClose.Load().(error); ok {
+				err = errClose
+			}
+		} else {
+			err = nil
+		}
+	})
+
+	return err
+}
+
+// LocalAddr implements net.Conn.LocalAddr
+func (c *Conn) LocalAddr() net.Addr {
+	return c.listener.pConn.LocalAddr()
+}
+
+// RemoteAddr implements net.Conn.RemoteAddr
+func (c *Conn) RemoteAddr() net.Addr {
+	return c.rAddr
+}
+
+// SetDeadline implements net.Conn.SetDeadline
+func (c *Conn) SetDeadline(t time.Time) error {
+	c.writeDeadline.Set(t)
+	return c.SetReadDeadline(t)
+}
+
+// SetReadDeadline implements net.Conn.SetDeadline
+func (c *Conn) SetReadDeadline(t time.Time) error {
+	return c.buffer.SetReadDeadline(t)
+}
+
+// SetWriteDeadline implements net.Conn.SetDeadline
+func (c *Conn) SetWriteDeadline(t time.Time) error {
+	c.writeDeadline.Set(t)
+	// Write deadline of underlying connection should not be changed
+	// since the connection can be shared.
+	return nil
+}
diff --git a/vendor/github.com/pion/udp/go.mod b/vendor/github.com/pion/udp/go.mod
new file mode 100644
index 0000000..59289b6
--- /dev/null
+++ b/vendor/github.com/pion/udp/go.mod
@@ -0,0 +1,5 @@
+module github.com/pion/udp
+
+go 1.14
+
+require github.com/pion/transport v0.10.0
diff --git a/vendor/github.com/pion/udp/go.sum b/vendor/github.com/pion/udp/go.sum
new file mode 100644
index 0000000..cd0abb2
--- /dev/null
+++ b/vendor/github.com/pion/udp/go.sum
@@ -0,0 +1,19 @@
+github.com/davecgh/go-spew v1.1.0 h1:ZDRjVQ15GmhC3fiQ8ni8+OwkZQO4DARzQgrnXU1Liz8=
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+github.com/pion/logging v0.2.2/go.mod h1:k0/tDVsRCX2Mb2ZEmTqNa7CWsQPc+YYCB7Q+5pahoms=
+github.com/pion/transport v0.10.0 h1:9M12BSneJm6ggGhJyWpDveFOstJsTiQjkLf4M44rm80=
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