64 lines
1.4 KiB
Go
64 lines
1.4 KiB
Go
package main
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import (
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"fmt"
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"log"
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"net"
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"os"
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"packets/configs"
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"packets/internal/consts"
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"path/filepath"
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"strings"
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)
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func CheckDownloaded(filename string) bool {
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cfg, err := configs.GetConfigTOML()
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if err != nil {
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log.Fatal(err)
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}
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_, err = os.Stat(filepath.Join(cfg.Config.Cache_d, filename))
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return err == nil
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}
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func main() {
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log.Println("Program started")
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pid := os.Getpid()
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if err := os.WriteFile(filepath.Join(consts.DefaultLinux_d, "udp.pid"), []byte(fmt.Sprint(pid)), 0664); err != nil {
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fmt.Println("error saving subprocess pid", err)
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}
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cfg, err := configs.GetConfigTOML()
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if err != nil {
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log.Fatal(err)
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}
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addr := net.UDPAddr{IP: net.IPv4zero, Port: 1333}
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conn, err := net.ListenUDP("udp", &addr)
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if err != nil {
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log.Fatal(err)
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}
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log.Println("Started connection listener")
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defer conn.Close()
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buf := make([]byte, 1500)
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for {
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n, remote, err := conn.ReadFromUDP(buf)
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if err != nil {
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log.Println("error creating udp socket", err)
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}
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msg := string(buf[:n])
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log.Printf("Received message : %s\n", msg)
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if !strings.HasPrefix(msg, "Q:") {
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log.Println("error: invalid message, this message don't follow the protocol")
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continue
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}
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filename := strings.TrimPrefix(msg, "Q:")
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if CheckDownloaded(filename) {
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reply := fmt.Sprintf("H:%s:%d", filename, cfg.Config.HttpPort)
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log.Printf("Package founded in cache dir, answering with: '%s'\n", reply)
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conn.WriteToUDP([]byte(reply), remote)
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}
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}
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}
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