Commit 14c68eb8 authored by Jakob Borg's avatar Jakob Borg

External discover

parents
discosrv
package main
import (
"log"
"net"
"sync"
"github.com/calmh/syncthing/discover"
)
type Node struct {
IP []byte
Port uint16
}
var (
nodes = make(map[string]Node)
lock sync.Mutex
)
func main() {
addr, _ := net.ResolveUDPAddr("udp", ":22025")
conn, err := net.ListenUDP("udp", addr)
if err != nil {
panic(err)
}
var buf = make([]byte, 1024)
for {
n, addr, err := conn.ReadFromUDP(buf)
if err != nil {
panic(err)
}
pkt, err := discover.DecodePacket(buf[:n])
if err != nil {
log.Println("Warning:", err)
continue
}
switch pkt.Magic {
case 0x20121025:
// Announcement
//lock.Lock()
ip := addr.IP.To4()
if ip == nil {
ip = addr.IP.To16()
}
node := Node{ip, uint16(pkt.Port)}
log.Println("<-", pkt.ID, node)
nodes[pkt.ID] = node
//lock.Unlock()
case 0x19760309:
// Query
//lock.Lock()
node, ok := nodes[pkt.ID]
//lock.Unlock()
if ok {
pkt := discover.Packet{
Magic: 0x20121025,
ID: pkt.ID,
Port: node.Port,
IP: node.IP,
}
_, _, err = conn.WriteMsgUDP(discover.EncodePacket(pkt), nil, addr)
if err != nil {
log.Println("Warning:", err)
} else {
log.Println("->", pkt.ID, node)
}
}
}
}
}
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