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366 lines
11 KiB
366 lines
11 KiB
// Copyright 2020 Justine Alexandra Roberts Tunney
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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// Example demonstrating how to make a phone call (SIP/SDP/RTP/DTMF) to an Echo
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// application without any higher level SIP abstractions.
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//
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// Example Trace:
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//
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// send 765 bytes to udp/[10.11.34.37]:5060 at 15:46:48.569658:
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// ------------------------------------------------------------------------
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// INVITE sip:10.11.34.37 SIP/2.0
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// Via: SIP/2.0/UDP 10.11.34.37:59516;rport;branch=z9hG4bKS308QB9UUpNyD
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// Max-Forwards: 70
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// From: <sip:10.11.34.37:59516>;tag=S1jX7UtK5Zerg
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// To: <sip:10.11.34.37>
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// Call-ID: 87704115-03b8-122e-08b5-001bfcce6bdf
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// CSeq: 133097268 INVITE
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// Contact: <sip:10.11.34.37:59516>
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// User-Agent: tube/0.1
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// Allow: INVITE, ACK, BYE, CANCEL, OPTIONS, PRACK, MESSAGE, SUBSCRIBE, NOTIFY, REFER, UPDATE, INFO
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// Supported: timer, 100rel
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// Allow-Events: talk
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// Content-Type: application/sdp
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// Content-Disposition: session
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// Content-Length: 218
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//
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// v=0
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// o=- 2862054018559638081 6057228511765453924 IN IP4 10.11.34.37
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// s=-
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// c=IN IP4 10.11.34.37
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// t=0 0
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// m=audio 23448 RTP/AVP 0 101
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// a=rtpmap:0 PCMU/8000
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// a=rtpmap:101 telephone-event/8000
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// a=fmtp:101 0-16
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// a=ptime:20
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// ------------------------------------------------------------------------
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// recv 282 bytes from udp/[10.11.34.37]:5060 at 15:46:48.570890:
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// ------------------------------------------------------------------------
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// SIP/2.0 100 Trying
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// Via: SIP/2.0/UDP 10.11.34.37:59516;rport=59516;branch=z9hG4bKS308QB9UUpNyD
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// From: <sip:10.11.34.37:59516>;tag=S1jX7UtK5Zerg
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// To: <sip:10.11.34.37>
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// Call-ID: 87704115-03b8-122e-08b5-001bfcce6bdf
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// CSeq: 133097268 INVITE
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// User-Agent: tube/0.1
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// Content-Length: 0
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//
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// ------------------------------------------------------------------------
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// recv 668 bytes from udp/[10.11.34.37]:5060 at 15:46:48.571844:
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// ------------------------------------------------------------------------
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// SIP/2.0 200 OK
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// Via: SIP/2.0/UDP 10.11.34.37:59516;rport=59516;branch=z9hG4bKS308QB9UUpNyD
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// From: <sip:10.11.34.37:59516>;tag=S1jX7UtK5Zerg
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// To: <sip:10.11.34.37>;tag=a1vFUD7vvK4ZN
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// Call-ID: 87704115-03b8-122e-08b5-001bfcce6bdf
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// CSeq: 133097268 INVITE
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// Contact: <sip:10.11.34.37>
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// User-Agent: tube/0.1
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// Accept: application/sdp
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// Allow: INVITE, ACK, BYE, CANCEL, OPTIONS
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// Supported: timer
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// Content-Type: application/sdp
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// Content-Disposition: session
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// Content-Length: 196
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//
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// v=0
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// o=- 403551387931241779 5960509760717556241 IN IP4 10.11.34.37
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// s=-
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// c=IN IP4 10.11.34.37
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// t=0 0
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// m=audio 19858 RTP/AVP 0
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// a=rtpmap:0 PCMU/8000
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// a=rtmap:97 speex/16000
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// a=rtmap:98 speex/8000
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// ------------------------------------------------------------------------
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// send 296 bytes to udp/[10.11.34.37]:5060 at 15:46:48.572320:
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// ------------------------------------------------------------------------
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// ACK sip:10.11.34.37 SIP/2.0
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// Via: SIP/2.0/UDP 10.11.34.37:59516;rport;branch=z9hG4bKtct1S6SZrZBHS
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// Max-Forwards: 70
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// From: <sip:10.11.34.37:59516>;tag=S1jX7UtK5Zerg
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// To: <sip:10.11.34.37>;tag=a1vFUD7vvK4ZN
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// Call-ID: 87704115-03b8-122e-08b5-001bfcce6bdf
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// CSeq: 133097268 ACK
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// Content-Length: 0
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//
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// ------------------------------------------------------------------------
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// send 1017 bytes to udp/[10.11.34.37]:5060 at 15:46:53.048617:
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// ------------------------------------------------------------------------
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// BYE sip:10.11.34.37 SIP/2.0
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// Via: SIP/2.0/UDP 10.11.34.37:59516;rport;branch=z9hG4bKUNKtU1a3N813m
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// Max-Forwards: 70
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// From: <sip:10.11.34.37:59516>;tag=S1jX7UtK5Zerg
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// To: <sip:10.11.34.37>;tag=a1vFUD7vvK4ZN
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// Call-ID: 87704115-03b8-122e-08b5-001bfcce6bdf
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// CSeq: 133097269 BYE
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// User-Agent: tube/0.1
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// Content-Type: text/plain
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// Content-Length: 671
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//
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// .--. .--.
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// .'(` / ..\
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// __.>\ '. _.---,._,' ____.' _o/
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// /.--. : |/' _.--.< '--. |.__
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// _..-' `\ /' `' _.-' /--'
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// >_.-``-. `Y /' _.---._____ _.--' /
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// '` .-''. \|: \.' ___, .-'` ~'--....___.-'
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// .'--._ `-: \/ /' \\
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// /.'`\ :; /' `-.
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// -` | |
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// :.; : | thank you for flying tube
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// |: | version o.1
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// | |
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// :. : | besiyata dishmaya
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// .jgs ; telecommunications inc.
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// /:::. `\
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// ------------------------------------------------------------------------
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// recv 353 bytes from udp/[10.11.34.37]:5060 at 15:46:53.049140:
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// ------------------------------------------------------------------------
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// SIP/2.0 200 OK
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// Via: SIP/2.0/UDP 10.11.34.37:59516;rport=59516;branch=z9hG4bKUNKtU1a3N813m
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// From: <sip:10.11.34.37:59516>;tag=S1jX7UtK5Zerg
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// To: <sip:10.11.34.37>;tag=a1vFUD7vvK4ZN
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// Call-ID: 87704115-03b8-122e-08b5-001bfcce6bdf
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// CSeq: 133097269 BYE
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// User-Agent: tube/0.1
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// Allow: INVITE, ACK, BYE, CANCEL, OPTIONS
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// Supported: timer
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// Content-Length: 0
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//
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// ------------------------------------------------------------------------
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//
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package echo_test
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import (
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"bytes"
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"log"
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"math/rand"
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"net"
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"testing"
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"time"
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"github.com/jart/gosip/rtp"
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"github.com/jart/gosip/sdp"
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"github.com/jart/gosip/sip"
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"github.com/jart/gosip/util"
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)
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func TestCallToEchoApp(t *testing.T) {
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// Connect to the remote SIP UDP endpoint.
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conn, err := net.Dial("udp", "127.0.0.1:5060")
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if err != nil {
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t.Error("sip dial:", err)
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return
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}
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defer conn.Close()
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raddr := conn.RemoteAddr().(*net.UDPAddr)
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laddr := conn.LocalAddr().(*net.UDPAddr)
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// Create an RTP socket.
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rtpsock, err := net.ListenPacket("udp", "108.61.60.146:0")
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if err != nil {
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t.Error("rtp listen:", err)
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return
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}
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defer rtpsock.Close()
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rtpaddr := rtpsock.LocalAddr().(*net.UDPAddr)
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// Create an invite message and attach the SDP.
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invite := &sip.Msg{
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CallID: util.GenerateCallID(),
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CSeq: util.GenerateCSeq(),
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Method: "INVITE",
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CSeqMethod: "INVITE",
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Request: &sip.URI{
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Scheme: "sip",
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User: "echo",
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Host: raddr.IP.String(),
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Port: uint16(raddr.Port),
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},
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Via: &sip.Via{
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Host: laddr.IP.String(),
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Port: uint16(laddr.Port),
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Param: &sip.Param{Name: "branch", Value: util.GenerateBranch()},
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},
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From: &sip.Addr{
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Display: "Echo Test",
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Uri: &sip.URI{
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Scheme: "sip",
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Host: laddr.IP.String(),
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Port: uint16(laddr.Port),
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},
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Param: &sip.Param{Name: "tag", Value: util.GenerateTag()},
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},
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To: &sip.Addr{
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Uri: &sip.URI{
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Scheme: "sip",
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Host: raddr.IP.String(),
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Port: uint16(raddr.Port),
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},
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},
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Contact: &sip.Addr{
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Uri: &sip.URI{
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Scheme: "sip",
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Host: laddr.IP.String(),
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Port: uint16(laddr.Port),
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},
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},
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UserAgent: "gosip/1.o",
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Payload: sdp.New(rtpaddr, sdp.ULAWCodec, sdp.DTMFCodec),
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}
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// Turn invite message into a packet and send via UDP socket.
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var b bytes.Buffer
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invite.Append(&b)
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log.Printf(">>> %s\n%s\n", raddr, b.String())
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if amt, err := conn.Write(b.Bytes()); err != nil || amt != b.Len() {
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t.Fatal(err)
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}
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// Receive provisional 100 Trying.
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conn.SetDeadline(time.Now().Add(time.Second))
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memory := make([]byte, 2048)
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amt, err := conn.Read(memory)
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if err != nil {
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t.Fatal("read 100 trying:", err)
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}
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log.Printf("<<< %s\n%s\n", raddr, string(memory[0:amt]))
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msg, err := sip.ParseMsg(memory[0:amt])
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if err != nil {
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t.Fatal("parse 100 trying", err)
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}
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if !msg.IsResponse() || msg.Status != 100 || msg.Phrase != "Trying" {
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t.Fatal("didn't get 100 trying :[")
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}
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// Receive 200 OK.
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conn.SetDeadline(time.Now().Add(5 * time.Second))
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amt, err = conn.Read(memory)
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if err != nil {
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t.Fatal("read 200 ok:", err)
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}
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log.Printf("<<< %s\n%s\n", raddr, string(memory[0:amt]))
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msg, err = sip.ParseMsg(memory[0:amt])
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if err != nil {
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t.Fatal("parse 200 ok:", err)
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}
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if !msg.IsResponse() || msg.Status != 200 || msg.Phrase != "OK" {
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t.Fatal("wanted 200 ok but got:", msg.Status, msg.Phrase)
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}
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// Figure out where they want us to send RTP.
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var rrtpaddr *net.UDPAddr
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if ms, ok := msg.Payload.(*sdp.SDP); ok {
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rrtpaddr = &net.UDPAddr{IP: net.ParseIP(ms.Addr), Port: int(ms.Audio.Port)}
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} else {
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t.Fatal("200 ok didn't have sdp payload")
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}
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// Acknowledge the 200 OK to answer the call.
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var ack sip.Msg
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ack.Request = invite.Request
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ack.From = msg.From
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ack.To = msg.To
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ack.CallID = msg.CallID
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ack.Method = "ACK"
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ack.CSeq = msg.CSeq
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ack.CSeqMethod = "ACK"
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ack.Via = msg.Via
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b.Reset()
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ack.Append(&b)
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if amt, err := conn.Write(b.Bytes()); err != nil || amt != b.Len() {
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t.Fatal(err)
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}
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// Send RTP packets containing junk until we get an echo response.
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quit := make(chan bool)
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go func() {
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frameout := make([]byte, rtp.HeaderSize+160)
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rtpHeader := rtp.Header{
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PT: sdp.ULAWCodec.PT,
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Seq: 666,
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TS: 0,
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Ssrc: rand.Uint32(),
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}
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for n := 0; n < 160; n++ {
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frameout[rtp.HeaderSize+n] = byte(n)
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}
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ticker := time.NewTicker(20 * time.Millisecond)
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defer ticker.Stop()
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for {
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select {
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case <-ticker.C:
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rtpHeader.Write(frameout)
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rtpHeader.TS += 160
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rtpHeader.Seq++
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amt, err = rtpsock.WriteTo(frameout, rrtpaddr)
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if err != nil {
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t.Fatal("rtp write", err)
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}
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case <-quit:
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return
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}
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}
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}()
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defer func() { quit <- true }()
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// We're talking to an echo application so they should send us back exactly
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// the same audio.
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rtpsock.SetDeadline(time.Now().Add(5 * time.Second))
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amt, _, err = rtpsock.ReadFrom(memory)
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if err != nil {
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t.Fatal("rtp read", err)
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}
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if amt != rtp.HeaderSize+160 {
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t.Fatal("rtp recv amt != 12+160")
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}
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var rtpHeader rtp.Header
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err = rtpHeader.Read(memory)
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if err != nil {
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t.Fatal(err)
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}
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for n := 0; n < 160; n++ {
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if memory[rtp.HeaderSize+n] != byte(n) {
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t.Fatal("rtp response audio didnt match")
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}
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}
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// Hangup (we'll be lazy and just change up the ack Msg)
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ack.Method = "BYE"
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ack.CSeqMethod = "BYE"
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ack.CSeq++
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b.Reset()
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ack.Append(&b)
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amt, err = conn.Write(b.Bytes())
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if err != nil || amt != b.Len() {
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t.Fatal(err)
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}
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// Wait for acknowledgment of hangup.
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conn.SetDeadline(time.Now().Add(time.Second))
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amt, err = conn.Read(memory)
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if err != nil {
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t.Fatal(err)
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}
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msg, err = sip.ParseMsg(memory[0:amt])
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if err != nil {
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t.Fatal(err)
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}
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if !msg.IsResponse() || msg.Status != 200 || msg.Phrase != "OK" {
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t.Fatal("wanted bye response 200 ok but got:", msg.Status, msg.Phrase)
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}
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}
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