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server.go
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server.go
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package main
import (
"crypto/tls"
"log"
"net"
"time"
"github.com/spf13/cobra"
"github.com/andrew-d/id"
"github.com/andrew-d/ptls"
)
var serverCmd = &cobra.Command{
Use: "server",
Short: "start a server that will send a file to connected clients",
Run: runServer,
}
func runServer(cmd *cobra.Command, args []string) {
if !haveCertAndKey() {
log.Fatalln("do not have a certificate / key - please run `ffsend generate` first!")
}
certPem, keyPem, err := loadCertAndKey()
if err != nil {
log.Fatalf("could not load certificate / key: %s", err)
}
cert, err := tls.X509KeyPair(certPem, keyPem)
if err != nil {
log.Fatalf("could not parse certificate / key: %s", err)
}
certID := ptls.IDFromTLSCert(cert)
listenAddr := ":12345"
log.Printf("starting server on: %s", listenAddr)
listener, err := net.Listen("tcp", listenAddr)
if err != nil {
log.Fatalf("Could not start TCP listener: %s", err)
}
for {
conn, err := listener.Accept()
if err != nil {
log.Printf("error accepting TCP connection: %s", err)
break
}
log.Printf("accepted connection from %s to %s", conn.RemoteAddr(), listenAddr)
go handleClient(conn, cert, certID)
}
}
func handleClient(tcpConn net.Conn, ourCert tls.Certificate, ourID id.ID) {
conn, err := ptls.Server(tcpConn, ourCert, []id.ID{ourID})
if err != nil {
log.Printf("error authenticating with client: %s", err)
tcpConn.Close()
return
}
defer conn.Close()
time.Sleep(1 * time.Second)
log.Printf("finished")
}