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server.go
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server.go
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// Copyright 2013-2014 go-diameter authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
// Diameter server.
// Generate SSL certificates:
// go run $GOROOT/src/pkg/crypto/tls/generate_cert.go --host localhost
package main
import (
"flag"
"log"
"net"
"runtime"
"github.com/fiorix/go-diameter/diam"
"github.com/fiorix/go-diameter/diam/datatypes"
)
const (
Identity = datatypes.DiameterIdentity("server")
Realm = datatypes.DiameterIdentity("localhost")
VendorId = datatypes.Unsigned32(13)
ProductName = datatypes.UTF8String("go-diameter")
)
var Quiet bool
func main() {
addr := flag.String("l", ":3868", "listen address and port")
cert := flag.String("cert", "", "SSL cert file (e.g. cert.pem)")
key := flag.String("key", "", "SSL key file (e.g. key.pem)")
q := flag.Bool("q", false, "quiet, do not print messages")
flag.Parse()
Quiet = *q
// Use all CPUs.
runtime.GOMAXPROCS(runtime.NumCPU())
// Message handlers:
diam.HandleFunc("CER", OnCER)
diam.HandleFunc("ALL", OnMSG) // Catch-all
// Handle server errors.
go func() {
for {
report := <-diam.ErrorReports()
log.Println("Error:", report.Error)
}
}()
// Start server.
if *cert != "" && *key != "" {
log.Println("Starting secure server on", *addr)
log.Fatal(diam.ListenAndServeTLS(*addr, *cert, *key, nil, nil))
} else {
log.Println("Starting server on", *addr)
log.Fatal(diam.ListenAndServe(*addr, nil, nil))
}
}
// OnCER handles Capabilities-Exchange-Request messages.
func OnCER(c diam.Conn, m *diam.Message) {
// Reject client if there's no Origin-Host.
host, err := m.FindAVP("Origin-Host")
if err != nil {
c.Close()
return
}
// Reject client if there's no Origin-Realm.
realm, err := m.FindAVP("Origin-Realm")
if err != nil {
c.Close()
return
}
// Reject client if there's no Host-IP-Address.
ipaddr, err := m.FindAVP("Host-IP-Address")
if err != nil {
c.Close()
return
}
// Reject client if there's no Origin-State-Id.
stateId, err := m.FindAVP("Origin-State-Id")
if err != nil {
c.Close()
return
}
if !Quiet {
//log.Println("Receiving message from %s", c.RemoteAddr().String())
log.Printf("Receiving message from %s.%s (%s)", host, realm, ipaddr)
log.Println(m)
}
// Craft CEA with result code 2001 (OK).
a := m.Answer(2001)
a.NewAVP("Origin-Host", 0x40, 0x00, Identity)
a.NewAVP("Origin-Realm", 0x40, 0x00, Realm)
laddr := c.LocalAddr()
ip, _, _ := net.SplitHostPort(laddr.String())
m.NewAVP("Host-IP-Address", 0x40, 0x0, datatypes.Address(net.ParseIP(ip)))
a.NewAVP("Vendor-Id", 0x40, 0x0, VendorId)
a.NewAVP("Product-Name", 0x40, 0x0, ProductName)
// Copy origin Origin-State-Id.
a.AddAVP(stateId)
if !Quiet {
log.Printf("Sending message to %s", c.RemoteAddr().String())
log.Println(a)
}
// Send message to the connection
if _, err := a.WriteTo(c); err != nil {
log.Println("Write failed:", err)
c.Close()
}
go func() {
<-c.(diam.CloseNotifier).CloseNotify()
if !Quiet {
log.Printf("Client %s disconnected",
c.RemoteAddr().String())
}
}()
}
// OnMSG handles all other messages and replies to them
// with a generic 2001 (OK) answer.
func OnMSG(c diam.Conn, m *diam.Message) {
// Ignore message if there's no Origin-State-Id.
stateId, err := m.FindAVP("Origin-State-Id")
if err != nil {
log.Println("Invalid message: missing Origin-State-Id\n", m)
}
if !Quiet {
log.Printf("Receiving message from %s", c.RemoteAddr().String())
log.Println(m)
}
// Craft answer with result code 2001 (OK).
a := m.Answer(2001)
a.NewAVP("Origin-Host", 0x40, 0x00, Identity)
a.NewAVP("Origin-Realm", 0x40, 0x00, Realm)
a.AddAVP(stateId)
if !Quiet {
log.Printf("Sending message to %s", c.RemoteAddr().String())
log.Println(a)
}
// Send message to the connection.
if _, err := a.WriteTo(c); err != nil {
log.Println("Write failed:", err)
c.Close()
}
}