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|
package main
import (
"flag"
"log"
"math/rand"
"net"
"strings"
"time"
"github.com/ishidawataru/sctp"
)
func serveClient(conn net.Conn, bufsize int) error {
for {
buf := make([]byte, bufsize+128) // add overhead of SCTPSndRcvInfoWrappedConn
n, err := conn.Read(buf)
if err != nil {
log.Printf("read failed: %v", err)
return err
}
log.Printf("read: %d", n)
n, err = conn.Write(buf[:n])
if err != nil {
log.Printf("write failed: %v", err)
return err
}
log.Printf("write: %d", n)
}
}
func main() {
var server = flag.Bool("server", false, "")
var ip = flag.String("ip", "0.0.0.0", "")
var port = flag.Int("port", 0, "")
var lport = flag.Int("lport", 0, "")
var bufsize = flag.Int("bufsize", 256, "")
var sndbuf = flag.Int("sndbuf", 0, "")
var rcvbuf = flag.Int("rcvbuf", 0, "")
flag.Parse()
ips := []net.IPAddr{}
for _, i := range strings.Split(*ip, ",") {
if a, err := net.ResolveIPAddr("ip", i); err == nil {
log.Printf("Resolved address '%s' to %s", i, a)
ips = append(ips, *a)
} else {
log.Printf("Error resolving address '%s': %v", i, err)
}
}
addr := &sctp.SCTPAddr{
IPAddrs: ips,
Port: *port,
}
log.Printf("raw addr: %+v\n", addr.ToRawSockAddrBuf())
if *server {
ln, err := sctp.ListenSCTP("sctp", addr)
if err != nil {
log.Fatalf("failed to listen: %v", err)
}
log.Printf("Listen on %s", ln.Addr())
for {
conn, err := ln.Accept()
if err != nil {
log.Fatalf("failed to accept: %v", err)
}
log.Printf("Accepted Connection from RemoteAddr: %s", conn.RemoteAddr())
wconn := sctp.NewSCTPSndRcvInfoWrappedConn(conn.(*sctp.SCTPConn))
if *sndbuf != 0 {
err = wconn.SetWriteBuffer(*sndbuf)
if err != nil {
log.Fatalf("failed to set write buf: %v", err)
}
}
if *rcvbuf != 0 {
err = wconn.SetReadBuffer(*rcvbuf)
if err != nil {
log.Fatalf("failed to set read buf: %v", err)
}
}
*sndbuf, err = wconn.GetWriteBuffer()
if err != nil {
log.Fatalf("failed to get write buf: %v", err)
}
*rcvbuf, err = wconn.GetWriteBuffer()
if err != nil {
log.Fatalf("failed to get read buf: %v", err)
}
log.Printf("SndBufSize: %d, RcvBufSize: %d", *sndbuf, *rcvbuf)
go serveClient(wconn, *bufsize)
}
} else {
var laddr *sctp.SCTPAddr
if *lport != 0 {
laddr = &sctp.SCTPAddr{
Port: *lport,
}
}
conn, err := sctp.DialSCTP("sctp", laddr, addr)
if err != nil {
log.Fatalf("failed to dial: %v", err)
}
log.Printf("Dail LocalAddr: %s; RemoteAddr: %s", conn.LocalAddr(), conn.RemoteAddr())
if *sndbuf != 0 {
err = conn.SetWriteBuffer(*sndbuf)
if err != nil {
log.Fatalf("failed to set write buf: %v", err)
}
}
if *rcvbuf != 0 {
err = conn.SetReadBuffer(*rcvbuf)
if err != nil {
log.Fatalf("failed to set read buf: %v", err)
}
}
*sndbuf, err = conn.GetWriteBuffer()
if err != nil {
log.Fatalf("failed to get write buf: %v", err)
}
*rcvbuf, err = conn.GetReadBuffer()
if err != nil {
log.Fatalf("failed to get read buf: %v", err)
}
log.Printf("SndBufSize: %d, RcvBufSize: %d", *sndbuf, *rcvbuf)
ppid := 0
for {
info := &sctp.SndRcvInfo{
Stream: uint16(ppid),
PPID: uint32(ppid),
}
ppid += 1
conn.SubscribeEvents(sctp.SCTP_EVENT_DATA_IO)
buf := make([]byte, *bufsize)
n, err := rand.Read(buf)
if n != *bufsize {
log.Fatalf("failed to generate random string len: %d", *bufsize)
}
n, err = conn.SCTPWrite(buf, info)
if err != nil {
log.Fatalf("failed to write: %v", err)
}
log.Printf("write: len %d", n)
n, info, err = conn.SCTPRead(buf)
if err != nil {
log.Fatalf("failed to read: %v", err)
}
log.Printf("read: len %d, info: %+v", n, info)
time.Sleep(time.Second)
}
}
}
|
