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gather.go
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package ice
import (
"crypto/tls"
"fmt"
"net"
"sync"
"time"
"github.com/pion/dtls/v2"
"github.com/pion/logging"
"github.com/pion/turn/v2"
)
const (
stunGatherTimeout = time.Second * 5
)
type closeable interface {
Close() error
}
// Close a net.Conn and log if we have a failure
func closeConnAndLog(c closeable, log logging.LeveledLogger, msg string) {
if c == nil {
log.Warnf("Conn is not allocated")
return
}
log.Warnf(msg)
if err := c.Close(); err != nil {
log.Warnf("Failed to close conn: %v", err)
}
}
// fakePacketConn wraps a net.Conn and emulates net.PacketConn
type fakePacketConn struct {
nextConn net.Conn
}
func (f *fakePacketConn) ReadFrom(p []byte) (n int, addr net.Addr, err error) {
n, err = f.nextConn.Read(p)
addr = f.nextConn.RemoteAddr()
return
}
func (f *fakePacketConn) Close() error { return f.nextConn.Close() }
func (f *fakePacketConn) LocalAddr() net.Addr { return f.nextConn.LocalAddr() }
func (f *fakePacketConn) SetDeadline(t time.Time) error { return f.nextConn.SetDeadline(t) }
func (f *fakePacketConn) SetReadDeadline(t time.Time) error { return f.nextConn.SetReadDeadline(t) }
func (f *fakePacketConn) SetWriteDeadline(t time.Time) error { return f.nextConn.SetWriteDeadline(t) }
func (f *fakePacketConn) WriteTo(p []byte, addr net.Addr) (n int, err error) {
return f.nextConn.Write(p)
}
// GatherCandidates initiates the trickle based gathering process.
func (a *Agent) GatherCandidates() error {
gatherErrChan := make(chan error, 1)
runErr := a.run(func(agent *Agent) {
if a.gatheringState != GatheringStateNew {
gatherErrChan <- ErrMultipleGatherAttempted
return
} else if a.onCandidateHdlr.Load() == nil {
gatherErrChan <- ErrNoOnCandidateHandler
return
}
a.gatherCandidates()
gatherErrChan <- nil
})
if runErr != nil {
return runErr
}
return <-gatherErrChan
}
func (a *Agent) gatherCandidates() <-chan struct{} {
gatherStateUpdated := make(chan bool)
a.chanCandidate = make(chan Candidate, 1)
var closeChanCandidateOnce sync.Once
go func() {
for c := range a.chanCandidate {
if onCandidateHdlr, ok := a.onCandidateHdlr.Load().(func(Candidate)); ok {
onCandidateHdlr(c)
}
}
if onCandidateHdlr, ok := a.onCandidateHdlr.Load().(func(Candidate)); ok {
onCandidateHdlr(nil)
}
}()
done := make(chan struct{})
go func() {
defer func() {
closeChanCandidateOnce.Do(func() {
close(a.chanCandidate)
})
close(done)
}()
if err := a.run(func(agent *Agent) {
a.gatheringState = GatheringStateGathering
close(gatherStateUpdated)
}); err != nil {
a.log.Warnf("failed to set gatheringState to GatheringStateGathering for gatherCandidates: %v", err)
return
}
<-gatherStateUpdated
for _, t := range a.candidateTypes {
switch t {
case CandidateTypeHost:
a.gatherCandidatesLocal(a.networkTypes)
case CandidateTypeServerReflexive:
a.gatherCandidatesSrflx(a.urls, a.networkTypes)
if a.extIPMapper != nil && a.extIPMapper.candidateType == CandidateTypeServerReflexive {
a.gatherCandidatesSrflxMapped(a.networkTypes)
}
case CandidateTypeRelay:
if err := a.gatherCandidatesRelay(a.urls); err != nil {
a.log.Errorf("Failed to gather relay candidates: %v\n", err)
}
}
}
if err := a.run(func(agent *Agent) {
closeChanCandidateOnce.Do(func() {
close(agent.chanCandidate)
})
a.gatheringState = GatheringStateComplete
}); err != nil {
a.log.Warnf("Failed to stop OnCandidate handler routine and update gatheringState: %v\n", err)
return
}
}()
return done
}
func (a *Agent) gatherCandidatesLocal(networkTypes []NetworkType) {
localIPs, err := localInterfaces(a.net, a.interfaceFilter, networkTypes)
if err != nil {
a.log.Warnf("failed to iterate local interfaces, host candidates will not be gathered %s", err)
return
}
for _, ip := range localIPs {
mappedIP := ip
if a.mDNSMode != MulticastDNSModeQueryAndGather && a.extIPMapper != nil && a.extIPMapper.candidateType == CandidateTypeHost {
if _mappedIP, err := a.extIPMapper.findExternalIP(ip.String()); err == nil {
mappedIP = _mappedIP
} else {
a.log.Warnf("1:1 NAT mapping is enabled but no external IP is found for %s\n", ip.String())
}
}
address := mappedIP.String()
if a.mDNSMode == MulticastDNSModeQueryAndGather {
address = a.mDNSName
}
for _, network := range supportedNetworks {
conn, err := listenUDPInPortRange(a.net, a.log, int(a.portmax), int(a.portmin), network, &net.UDPAddr{IP: ip, Port: 0})
if err != nil {
a.log.Warnf("could not listen %s %s\n", network, ip)
continue
}
port := conn.LocalAddr().(*net.UDPAddr).Port
hostConfig := CandidateHostConfig{
Network: network,
Address: address,
Port: port,
Component: ComponentRTP,
}
c, err := NewCandidateHost(&hostConfig)
if err != nil {
closeConnAndLog(conn, a.log, fmt.Sprintf("Failed to create host candidate: %s %s %d: %v\n", network, mappedIP, port, err))
continue
}
if a.mDNSMode == MulticastDNSModeQueryAndGather {
if err = c.setIP(ip); err != nil {
closeConnAndLog(conn, a.log, fmt.Sprintf("Failed to create host candidate: %s %s %d: %v\n", network, mappedIP, port, err))
continue
}
}
if err := a.addCandidate(c, conn); err != nil {
if closeErr := c.close(); closeErr != nil {
a.log.Warnf("Failed to close candidate: %v", closeErr)
}
a.log.Warnf("Failed to append to localCandidates and run onCandidateHdlr: %v\n", err)
}
}
}
}
func (a *Agent) gatherCandidatesSrflxMapped(networkTypes []NetworkType) {
for _, networkType := range networkTypes {
network := networkType.String()
conn, err := listenUDPInPortRange(a.net, a.log, int(a.portmax), int(a.portmin), network, &net.UDPAddr{IP: nil, Port: 0})
if err != nil {
a.log.Warnf("Failed to listen %s: %v\n", network, err)
continue
}
laddr := conn.LocalAddr().(*net.UDPAddr)
mappedIP, err := a.extIPMapper.findExternalIP(laddr.IP.String())
if err != nil {
closeConnAndLog(conn, a.log, fmt.Sprintf("1:1 NAT mapping is enabled but no external IP is found for %s\n", laddr.IP.String()))
continue
}
srflxConfig := CandidateServerReflexiveConfig{
Network: network,
Address: mappedIP.String(),
Port: laddr.Port,
Component: ComponentRTP,
RelAddr: laddr.IP.String(),
RelPort: laddr.Port,
}
c, err := NewCandidateServerReflexive(&srflxConfig)
if err != nil {
closeConnAndLog(conn, a.log, fmt.Sprintf("Failed to create server reflexive candidate: %s %s %d: %v\n",
network,
mappedIP.String(),
laddr.Port,
err))
continue
}
if err := a.addCandidate(c, conn); err != nil {
if closeErr := c.close(); closeErr != nil {
a.log.Warnf("Failed to close candidate: %v", closeErr)
}
a.log.Warnf("Failed to append to localCandidates and run onCandidateHdlr: %v\n", err)
}
}
}
func (a *Agent) gatherCandidatesSrflx(urls []*URL, networkTypes []NetworkType) {
var wg sync.WaitGroup
for _, networkType := range networkTypes {
for i := range urls {
if urls[i].Scheme != SchemeTypeSTUN {
continue
}
wg.Add(1)
go func(url URL, network string) {
defer wg.Done()
hostPort := fmt.Sprintf("%s:%d", url.Host, url.Port)
serverAddr, err := a.net.ResolveUDPAddr(network, hostPort)
if err != nil {
a.log.Warnf("failed to resolve stun host: %s: %v", hostPort, err)
return
}
conn, err := listenUDPInPortRange(a.net, a.log, int(a.portmax), int(a.portmin), network, &net.UDPAddr{IP: nil, Port: 0})
if err != nil {
closeConnAndLog(conn, a.log, fmt.Sprintf("Failed to listen for %s: %v\n", serverAddr.String(), err))
return
}
xoraddr, err := getXORMappedAddr(conn, serverAddr, stunGatherTimeout)
if err != nil {
closeConnAndLog(conn, a.log, fmt.Sprintf("could not get server reflexive address %s %s: %v\n", network, url, err))
return
}
ip := xoraddr.IP
port := xoraddr.Port
laddr := conn.LocalAddr().(*net.UDPAddr)
srflxConfig := CandidateServerReflexiveConfig{
Network: network,
Address: ip.String(),
Port: port,
Component: ComponentRTP,
RelAddr: laddr.IP.String(),
RelPort: laddr.Port,
}
c, err := NewCandidateServerReflexive(&srflxConfig)
if err != nil {
closeConnAndLog(conn, a.log, fmt.Sprintf("Failed to create server reflexive candidate: %s %s %d: %v\n", network, ip, port, err))
return
}
if err := a.addCandidate(c, conn); err != nil {
if closeErr := c.close(); closeErr != nil {
a.log.Warnf("Failed to close candidate: %v", closeErr)
}
a.log.Warnf("Failed to append to localCandidates and run onCandidateHdlr: %v\n", err)
}
}(*urls[i], networkType.String())
}
}
// Block until all STUN URLs have been gathered (or timed out)
wg.Wait()
}
func (a *Agent) gatherCandidatesRelay(urls []*URL) error {
var wg sync.WaitGroup
network := NetworkTypeUDP4.String() // TODO IPv6
for i := range urls {
switch {
case urls[i].Scheme != SchemeTypeTURN && urls[i].Scheme != SchemeTypeTURNS:
continue
case urls[i].Username == "":
return ErrUsernameEmpty
case urls[i].Password == "":
return ErrPasswordEmpty
}
wg.Add(1)
go func(url URL) {
defer wg.Done()
TURNServerAddr := fmt.Sprintf("%s:%d", url.Host, url.Port)
var (
locConn net.PacketConn
err error
RelAddr string
RelPort int
)
switch {
case url.Proto == ProtoTypeUDP && url.Scheme == SchemeTypeTURN:
if locConn, err = a.net.ListenPacket(network, "0.0.0.0:0"); err != nil {
a.log.Warnf("Failed to listen %s: %v\n", network, err)
return
}
RelAddr = locConn.LocalAddr().(*net.UDPAddr).IP.String()
RelPort = locConn.LocalAddr().(*net.UDPAddr).Port
case url.Proto == ProtoTypeTCP && url.Scheme == SchemeTypeTURN:
tcpAddr, connectErr := net.ResolveTCPAddr(NetworkTypeTCP4.String(), TURNServerAddr)
if connectErr != nil {
a.log.Warnf("Failed to resolve TCP Addr %s: %v\n", TURNServerAddr, connectErr)
return
}
conn, connectErr := net.DialTCP(NetworkTypeTCP4.String(), nil, tcpAddr)
if connectErr != nil {
a.log.Warnf("Failed to Dial TCP Addr %s: %v\n", TURNServerAddr, connectErr)
return
}
RelAddr = conn.LocalAddr().(*net.TCPAddr).IP.String()
RelPort = conn.LocalAddr().(*net.TCPAddr).Port
locConn = turn.NewSTUNConn(conn)
case url.Proto == ProtoTypeUDP && url.Scheme == SchemeTypeTURNS:
udpAddr, connectErr := net.ResolveUDPAddr(network, TURNServerAddr)
if connectErr != nil {
a.log.Warnf("Failed to resolve UDP Addr %s: %v\n", TURNServerAddr, connectErr)
return
}
conn, connectErr := dtls.Dial(network, udpAddr, &dtls.Config{
InsecureSkipVerify: a.insecureSkipVerify, //nolint:gosec
})
if connectErr != nil {
a.log.Warnf("Failed to Dial DTLS Addr %s: %v\n", TURNServerAddr, connectErr)
return
}
RelAddr = conn.LocalAddr().(*net.UDPAddr).IP.String()
RelPort = conn.LocalAddr().(*net.UDPAddr).Port
locConn = &fakePacketConn{conn}
case url.Proto == ProtoTypeTCP && url.Scheme == SchemeTypeTURNS:
conn, connectErr := tls.Dial(NetworkTypeTCP4.String(), TURNServerAddr, &tls.Config{
InsecureSkipVerify: a.insecureSkipVerify, //nolint:gosec
})
if connectErr != nil {
a.log.Warnf("Failed to Dial TLS Addr %s: %v\n", TURNServerAddr, connectErr)
return
}
RelAddr = conn.LocalAddr().(*net.TCPAddr).IP.String()
RelPort = conn.LocalAddr().(*net.TCPAddr).Port
locConn = turn.NewSTUNConn(conn)
default:
a.log.Warnf("Unable to handle URL in gatherCandidatesRelay %v\n", url)
return
}
client, err := turn.NewClient(&turn.ClientConfig{
TURNServerAddr: TURNServerAddr,
Conn: locConn,
Username: url.Username,
Password: url.Password,
LoggerFactory: a.loggerFactory,
Net: a.net,
})
if err != nil {
closeConnAndLog(locConn, a.log, fmt.Sprintf("Failed to build new turn.Client %s %s\n", TURNServerAddr, err))
return
}
if err = client.Listen(); err != nil {
client.Close()
closeConnAndLog(locConn, a.log, fmt.Sprintf("Failed to listen on turn.Client %s %s\n", TURNServerAddr, err))
return
}
relayConn, err := client.Allocate()
if err != nil {
client.Close()
closeConnAndLog(locConn, a.log, fmt.Sprintf("Failed to allocate on turn.Client %s %s\n", TURNServerAddr, err))
return
}
raddr := relayConn.LocalAddr().(*net.UDPAddr)
relayConfig := CandidateRelayConfig{
Network: network,
Component: ComponentRTP,
Address: raddr.IP.String(),
Port: raddr.Port,
RelAddr: RelAddr,
RelPort: RelPort,
OnClose: func() error {
client.Close()
return locConn.Close()
},
}
candidate, err := NewCandidateRelay(&relayConfig)
if err != nil {
if relayConErr := relayConn.Close(); relayConErr != nil {
a.log.Warnf("Failed to close relay %v", relayConErr)
}
client.Close()
closeConnAndLog(locConn, a.log, fmt.Sprintf("Failed to create relay candidate: %s %s: %v\n", network, raddr.String(), err))
return
}
if err := a.addCandidate(candidate, relayConn); err != nil {
if closeErr := candidate.close(); closeErr != nil {
a.log.Warnf("Failed to close candidate: %v", closeErr)
}
a.log.Warnf("Failed to append to localCandidates and run onCandidateHdlr: %v\n", err)
}
}(*urls[i])
}
// Block until all STUN URLs have been gathered (or timed out)
wg.Wait()
return nil
}