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97 lines
2.5 KiB
97 lines
2.5 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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// This code demonstrates how SIP works without the zillion layers of
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// sugar coating.
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package rawsip_test
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import (
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"github.com/jart/gosip/util"
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"net"
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"strconv"
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"strings"
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"testing"
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"time"
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)
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// An 'OPTIONS' message is used to:
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//
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// - Ping a server to see if it's alive.
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// - Keep a connection alive in nat situations.
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// - Ask a user agent what features they support.
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//
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func TestRawSIPOptions(t *testing.T) {
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// create a new udp socket bound to a random port and "connect"
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// the socket to the remote address
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raddr := "127.0.0.1:5060"
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conn, err := net.Dial("udp", raddr)
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if err != nil {
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t.Error(err)
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return
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}
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// What local ip/port binding did the kernel choose for us?
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laddr := conn.LocalAddr().String()
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// Construct a SIP message.
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cseq := util.GenerateCSeq()
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fromtag := util.GenerateTag()
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callid := util.GenerateCallID()
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packet := "" +
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"OPTIONS sip:echo@" + laddr + " SIP/2.0\r\n" +
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"Via: SIP/2.0/UDP " + laddr + "\r\n" +
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"Max-Forwards: 70\r\n" +
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"To: <sip:" + raddr + ">\r\n" +
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"From: <sip:" + laddr + ">;tag=" + fromtag + "\r\n" +
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"Call-ID: " + callid + "\r\n" +
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"CSeq: " + strconv.Itoa(cseq) + " OPTIONS\r\n" +
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"Contact: <sip:" + laddr + ">\r\n" +
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"User-Agent: pokémon/1.o\r\n" +
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"Accept: application/sdp\r\n" +
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"Content-Length: 0\r\n" +
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"\r\n"
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// Transmit our message.
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bpacket := []uint8(packet)
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amt, err := conn.Write(bpacket)
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if err != nil || amt != len(bpacket) {
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t.Error(err)
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return
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}
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// Wait no longer than a second for them to get back to us.
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err = conn.SetDeadline(time.Now().Add(time.Second))
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if err != nil {
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t.Error(err)
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return
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}
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// Receive response.
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buf := make([]byte, 2048)
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amt, err = conn.Read(buf)
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if err != nil {
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t.Error(err)
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return
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}
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response := buf[0:amt]
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// Read response.
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msg := string(response)
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lines := strings.Split(msg, "\r\n")
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if lines[0] != "SIP/2.0 200 OK" {
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t.Errorf("not ok :[\n%s", msg)
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return
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}
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}
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