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gather.go
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gather.go
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package ice
import (
"fmt"
"net"
"time"
"github.com/pion/stun"
)
func localInterfaces(networkTypes []NetworkType) (ips []net.IP) {
ifaces, err := net.Interfaces()
if err != nil {
return ips
}
var IPv4Requested, IPv6Requested bool
for _, typ := range networkTypes {
if typ.IsIPv4() {
IPv4Requested = true
}
if typ.IsIPv6() {
IPv6Requested = true
}
}
for _, iface := range ifaces {
if iface.Flags&net.FlagUp == 0 {
continue // interface down
}
if iface.Flags&net.FlagLoopback != 0 {
continue // loopback interface
}
addrs, err := iface.Addrs()
if err != nil {
return ips
}
for _, addr := range addrs {
var ip net.IP
switch addr := addr.(type) {
case *net.IPNet:
ip = addr.IP
case *net.IPAddr:
ip = addr.IP
}
if ip == nil || ip.IsLoopback() {
continue
}
if ipv4 := ip.To4(); ipv4 == nil {
if !IPv6Requested {
continue
} else if !isSupportedIPv6(ip) {
continue
}
} else if !IPv4Requested {
continue
}
ips = append(ips, ip)
}
}
return ips
}
func listenUDP(portMax, portMin int, network string, laddr *net.UDPAddr) (*net.UDPConn, error) {
if (laddr.Port != 0) || ((portMin == 0) && (portMax == 0)) {
return net.ListenUDP(network, laddr)
}
var i, j int
i = portMin
if i == 0 {
i = 1
}
j = portMax
if j == 0 {
j = 0xFFFF
}
for i <= j {
c, e := net.ListenUDP(network, &net.UDPAddr{IP: laddr.IP, Port: i})
if e == nil {
return c, e
}
i++
}
return nil, ErrPort
}
func gatherCandidatesLocal(a *Agent, networkTypes []NetworkType) {
localIPs := localInterfaces(networkTypes)
for _, ip := range localIPs {
for _, network := range supportedNetworks {
conn, err := listenUDP(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
c, err := NewCandidateHost(network, ip, port, ComponentRTP)
if err != nil {
a.log.Warnf("Failed to create host candidate: %s %s %d: %v\n", network, ip, port, err)
continue
}
networkType := c.NetworkType
set := a.localCandidates[networkType]
set = append(set, c)
a.localCandidates[networkType] = set
c.start(a, conn)
}
}
}
func gatherCandidatesReflective(a *Agent, urls []*URL, networkTypes []NetworkType) {
localIPs := localInterfaces(networkTypes)
for _, networkType := range networkTypes {
network := networkType.String()
for _, url := range urls {
hostPort := fmt.Sprintf("%s:%d", url.Host, url.Port)
serverAddr, err := net.ResolveUDPAddr(network, hostPort)
if err != nil {
a.log.Warnf("failed to resolve stun host: %s: %v", hostPort, err)
continue
}
for _, ip := range localIPs {
switch url.Scheme {
case SchemeTypeSTUN:
conn, err := listenUDP(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
}
xoraddr, err := stun.GetMappedAddressUDP(conn, serverAddr, time.Second*5)
if err != nil {
a.log.Warnf("could not get server reflexive address %s %s: %v\n", network, url, err)
continue
}
laddr := conn.LocalAddr().(*net.UDPAddr)
ip := xoraddr.IP
port := xoraddr.Port
relIP := laddr.IP.String()
relPort := laddr.Port
c, err := NewCandidateServerReflexive(network, ip, port, ComponentRTP, relIP, relPort)
if err != nil {
a.log.Warnf("Failed to create server reflexive candidate: %s %s %d: %v\n", network, ip, port, err)
continue
}
networkType := c.NetworkType
set := a.localCandidates[networkType]
set = append(set, c)
a.localCandidates[networkType] = set
c.start(a, conn)
default:
a.log.Warnf("scheme %s is not implemented\n", url.Scheme)
continue
}
}
}
}
}