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proxy.go
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proxy.go
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// Package rtspv2
// Created by RTT.
// Author: teocci@yandex.com on 2021-Oct-27
package rtspv2
import (
"errors"
"fmt"
"net"
"net/url"
"strconv"
"strings"
"time"
"github.com/google/uuid"
)
var Debug bool
type ProxyConn struct {
URL *url.URL
netconn net.Conn
readbuf []byte
writebuf []byte
sdp []byte
playing bool
options bool
cseq int
session string
protocol int
}
type Proxy struct {
Addr string
HandleConn func(*ProxyConn)
HandleOptions func(*ProxyConn)
HandlePlay func(*ProxyConn)
}
func NewProxyConn(netconn net.Conn) *ProxyConn {
conn := &ProxyConn{}
conn.netconn = netconn
conn.writebuf = make([]byte, 4096)
conn.readbuf = make([]byte, 4096)
conn.session = uuid.New().String()
conn.cseq = 1
return conn
}
func (self *ProxyConn) Close() (err error) {
return nil
}
func (self *ProxyConn) WritePacket(pkt *[]byte) (err error) {
err = self.netconn.SetDeadline(time.Now().Add(time.Second * 5))
if err != nil {
return err
}
_, err = self.netconn.Write(*pkt)
if err != nil {
return err
}
return nil
}
func (self *ProxyConn) WriteHeader(sdp []byte) {
self.sdp = sdp
}
func (self *ProxyConn) NetConn() net.Conn {
return self.netconn
}
func (self *Proxy) ListenAndServe() (err error) {
addr := self.Addr
if addr == "" {
addr = ":554"
}
var tcpaddr *net.TCPAddr
if tcpaddr, err = net.ResolveTCPAddr("tcp", addr); err != nil {
err = fmt.Errorf("rtsp: ListenAndServe: %s", err)
return
}
var listener *net.TCPListener
if listener, err = net.ListenTCP("tcp", tcpaddr); err != nil {
return
}
if Debug {
fmt.Println("rtsp: server: listening on", addr)
}
for {
var netconn net.Conn
if netconn, err = listener.Accept(); err != nil {
return
}
if Debug {
fmt.Println("rtsp: server: accepted")
}
conn := NewProxyConn(netconn)
go func() {
err := self.handleConn(conn)
if Debug {
fmt.Println("rtsp: server: client closed err:", err)
}
//defer conn.Close()
}()
}
}
func (self *Proxy) handleConn(conn *ProxyConn) (err error) {
if self.HandleConn != nil {
self.HandleConn(conn)
} else {
for {
if err = conn.prepare(); err != nil {
return
}
if conn.options {
if self.HandleOptions != nil {
self.HandleOptions(conn)
}
}
if conn.playing {
if self.HandlePlay != nil {
self.HandlePlay(conn)
}
}
}
}
return
}
func (self *ProxyConn) prepare() error {
self.options = false
self.cseq++
err := self.netconn.SetDeadline(time.Now().Add(time.Second * 5))
if err != nil {
return err
}
n, err := self.netconn.Read(self.readbuf)
if err != nil {
return err
}
allStringsSlice := strings.Split(string(self.readbuf[:n]), "\r\n")
if len(allStringsSlice) == 0 {
return errors.New("no cmd")
}
fistStringsSlice := strings.Split(allStringsSlice[0], " ")
if len(fistStringsSlice) == 0 {
return errors.New("no fist cmd")
}
switch fistStringsSlice[0] {
case OPTIONS:
if len(fistStringsSlice) < 2 {
return errors.New("return bad OPTIONS")
}
if self.URL, err = url.Parse(fistStringsSlice[1]); err != nil {
return err
}
_, err := self.netconn.Write([]byte("RTSP/1.0 200 OK\r\nPublic: OPTIONS, DESCRIBE, SETUP, PLAY\r\nSession: " + self.session + "\r\nCSeq: " + strconv.Itoa(self.cseq) + "\r\n\r\n"))
if err != nil {
return err
}
self.options = true
case SETUP:
if strings.Contains(string(self.readbuf[:n]), "RTP/AVP/UDP") {
_, err := self.netconn.Write([]byte("RTSP/1.0 461 Unsupported transport\r\nCSeq: " + strconv.Itoa(self.cseq) + "\r\nSession: " + self.session + "\r\n\r\n"))
if err != nil {
return err
}
return nil
}
_, err := self.netconn.Write([]byte("RTSP/1.0 200 OK\r\nCSeq: " + strconv.Itoa(self.cseq) + "\r\nSession: " + self.session + "\r\nTransport: RTP/AVP/TCP;unicast;interleaved=0-1\r\n\r\n"))
if err != nil {
return err
}
case DESCRIBE:
buf := "RTSP/1.0 200 OK\r\nContent-Type: application/sdp\r\nSession: " + self.session + "\r\nContent-Length: " + strconv.Itoa(len(self.sdp)) + "\r\nCSeq: " + strconv.Itoa(self.cseq) + "\r\n\r\n"
_, err := self.netconn.Write([]byte(buf + string(self.sdp)))
if err != nil {
return err
}
case PLAY:
_, err := self.netconn.Write([]byte("RTSP/1.0 200 OK\r\nSession: " + self.session + ";timeout=60\r\nCSeq: " + strconv.Itoa(self.cseq) + "\r\n\r\n"))
if err != nil {
return err
}
self.playing = true
default:
return errors.New("metod not found")
}
return nil
}