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udp.go
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udp.go
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package yaklib
import (
"context"
"fmt"
"github.com/yaklang/yaklang/common/yak/yaklib/codec"
"io"
"math/rand"
"net"
"reflect"
"strconv"
"time"
"github.com/yaklang/yaklang/common/fp"
"github.com/yaklang/yaklang/common/log"
"github.com/yaklang/yaklang/common/netx"
"github.com/yaklang/yaklang/common/utils"
"github.com/yaklang/yaklang/common/utils/regen"
)
type udpConnection struct {
*net.UDPConn
isServer bool
remoteAddr net.Addr
timeoutSeconds time.Duration
}
type udpClientConfig struct {
localAddr *net.UDPAddr
timeoutSeconds time.Duration
}
type udpClientOption func(i *udpClientConfig)
func clientLocalAddr(target string) udpClientOption {
return func(i *udpClientConfig) {
addr, err := net.ResolveUDPAddr("udp", target)
if err != nil {
log.Errorf("resove udp addr failed: %s origin: %v", target, addr.String())
return
}
i.localAddr = addr
}
}
func clientTimeout(target float64) udpClientOption {
return func(i *udpClientConfig) {
i.timeoutSeconds = utils.FloatSecondDuration(target)
}
}
func connectUdp(target string, portRaw any, opts ...udpClientOption) (*udpConnection, error) {
config := &udpClientConfig{timeoutSeconds: 5 * time.Second}
for _, opt := range opts {
opt(config)
}
host, portParsed, _ := utils.ParseStringToHostPort(target)
port := codec.Atoi(fmt.Sprint(portRaw))
if port <= 0 {
port = portParsed
}
if port <= 0 {
return nil, utils.Errorf("un-specific port: %v %v", target, portRaw)
}
target = utils.HostPort(host, port)
var conn net.Conn
remoteAddr, err := net.ResolveUDPAddr("udp", target)
if err != nil {
return nil, err
}
if config.localAddr != nil {
conn, err = net.DialUDP("udp", config.localAddr, remoteAddr)
if err != nil {
return nil, utils.Errorf("dial udp[%s] failed: %s", target, err)
}
} else {
conn, err = net.Dial("udp", remoteAddr.String())
if err != nil {
return nil, utils.Errorf("dial udp[%s] failed: %s", target, err)
}
}
uc, ok := conn.(*net.UDPConn)
if !ok {
return nil, utils.Errorf("BUG: not a net.UDPConn instead of %v", reflect.TypeOf(conn))
}
return &udpConnection{UDPConn: uc, timeoutSeconds: config.timeoutSeconds, remoteAddr: remoteAddr}, nil
}
func (t *udpConnection) SetTimeout(seconds float64) {
t.timeoutSeconds = utils.FloatSecondDuration(seconds)
}
func (t *udpConnection) GetTimeout() time.Duration {
if t.timeoutSeconds <= 0 {
t.timeoutSeconds = 5 * time.Second
return 5 * time.Second
}
return t.timeoutSeconds
}
func (t *udpConnection) Recv() ([]byte, error) {
t.SetReadDeadline(time.Now().Add(t.GetTimeout()))
raw, err := io.ReadAll(t)
t.SetReadDeadline(time.Time{})
if len(raw) > 0 {
return raw, nil
}
return raw, err
//results, err := utils.(t, t.GetTimeout())
//if err != nil {
// return results, err
//}
//return results, nil
}
func (r *udpConnection) RecvLen(i int64) ([]byte, error) {
return io.ReadAll(io.LimitReader(r, i))
}
func (t *udpConnection) RecvString() (string, error) {
raw, err := t.Recv()
if err != nil {
return string(raw), err
}
return string(raw), nil
}
func (t *udpConnection) RecvTimeout(seconds float64) ([]byte, error) {
t.SetReadDeadline(time.Now().Add(utils.FloatSecondDuration(seconds)))
raw, err := io.ReadAll(t)
t.SetReadDeadline(time.Time{})
if len(raw) > 0 {
return raw, nil
}
return raw, err
//results, err := utils.ReadConnWithTimeout(t, time.Duration(float64(time.Second)*seconds))
//if err != nil {
// return results, err
//}
//return results, nil
}
func (t *udpConnection) RecvStringTimeout(seconds float64) (string, error) {
raw, err := t.RecvTimeout(seconds)
if err != nil {
return string(raw), err
}
return string(raw), err
}
func (t *udpConnection) SendTo(i interface{}, target string) error {
host, port, err := utils.ParseStringToHostPort(target)
if err != nil {
return err
}
if !utils.IsIPv4(host) {
host = netx.LookupFirst(host, netx.WithTimeout(t.GetTimeout()))
if host == "" {
return utils.Errorf("cannot found ip by %v", host)
}
}
addr := &net.UDPAddr{
IP: net.ParseIP(host),
Port: port,
}
switch ret := i.(type) {
case []byte:
_, err = t.WriteToUDP(ret, addr)
case string:
_, err = t.WriteToUDP([]byte(ret), addr)
default:
return utils.Errorf("error param type:[%v] value:[%#v], need string/[]byte", reflect.TypeOf(i), i)
}
return err
}
func (t *udpConnection) Write(i []byte) (int, error) {
if t.isServer {
return t.WriteTo(i, t.remoteAddr)
}
if t.UDPConn.RemoteAddr() != nil {
// pre-connect, use t.UDPConn.Write
return t.UDPConn.Write(utils.InterfaceToBytes(i))
}
return t.WriteTo(i, t.remoteAddr)
}
func (t *udpConnection) Send(i interface{}) error {
var err error
if t.UDPConn.RemoteAddr() != nil {
// pre-connect, use t.UDPConn.Write
_, err := t.UDPConn.Write(utils.InterfaceToBytes(i))
return err
}
var n int
switch ret := i.(type) {
case []byte:
n, err = t.WriteTo(ret, t.remoteAddr)
case string:
n, err = t.WriteTo([]byte(ret), t.remoteAddr)
default:
return utils.Errorf("error param type:[%v] value:[%#v], need string/[]byte", reflect.TypeOf(i), i)
}
_ = n
return err
}
func (t *udpConnection) ReadFromAddr() ([]byte, net.Addr, error) {
var raw []byte
buf := make([]byte, 4096)
defer func() {
t.SetReadDeadline(time.Time{})
}()
for {
t.UDPConn.SetDeadline(time.Now().Add(t.timeoutSeconds))
n, addr, err := t.UDPConn.ReadFromUDP(buf)
if addr != nil && t.remoteAddr == nil {
t.remoteAddr = addr
}
raw = append(raw, buf[:n]...)
if n < len(buf) {
return raw, addr, err
}
}
}
func (t *udpConnection) ReadStringFromAddr() (string, net.Addr, error) {
raw, addr, err := t.ReadFromAddr()
return string(raw), addr, err
}
type udpServerConfig struct {
callback func(conn *udpConnection, msg []byte)
ctx context.Context
timeout time.Duration
}
type UdpServerOpt func(config *udpServerConfig)
func udpServe(host string, port interface{}, opts ...UdpServerOpt) error {
config := &udpServerConfig{timeout: 5 * time.Second}
for _, opt := range opts {
opt(config)
}
if config.ctx == nil {
config.ctx = context.Background()
}
udpAddr, err := net.ResolveUDPAddr("udp", utils.HostPort(host, port))
if err != nil {
return utils.Errorf("resolve udp addr: %v", err)
}
log.Debugf("start to listen udp://%v", udpAddr)
conn, err := net.ListenUDP("udp", udpAddr)
if err != nil {
return err
}
defer conn.Close()
var done = utils.NewBool(false)
//log.Infof("finished listening on udp://%v", udpAddr)
go func() {
select {
case <-config.ctx.Done():
done.Set()
conn.Close()
}
}()
wConn := &udpConnection{
UDPConn: conn,
timeoutSeconds: config.timeout,
}
for {
if done.IsSet() {
return config.ctx.Err()
}
//select {
//case <-config.ctx.Done():
// return config.ctx.Err()
//default:
//}
raw, addr, err := wConn.ReadFromAddr()
if err != nil && raw == nil {
if utils.IsErrorNetOpTimeout(err) {
continue
}
if err != nil {
log.Warnf("udp ReadFromAddr failed: %s", err)
}
continue
}
//log.Infof("recv: %#v from: %v", raw, addr.String())
go func() {
if config.callback == nil {
config.callback = func(conn *udpConnection, msg []byte) {
log.Infof("udp://%v send %v local: %v", conn.remoteAddr.String(), strconv.Quote(string(msg)), utils.HostPort(host, port))
}
}
config.callback(&udpConnection{
isServer: true,
UDPConn: conn,
remoteAddr: addr,
timeoutSeconds: 5 * time.Second,
}, raw)
}()
}
}
var UDPExport = map[string]interface{}{
"MockUDPProtocol": DebugMockUDPProtocol,
"Connect": connectUdp,
"clientTimeout": clientTimeout,
"clientLocalAddr": clientLocalAddr,
"Serve": udpServe,
"serverTimeout": UdpWithTimeout,
"serverContext": UdpWithContext,
"serverCallback": UdpWithCallback,
}
func UdpWithCallback(cb func(*udpConnection, []byte)) UdpServerOpt {
return func(config *udpServerConfig) {
config.callback = cb
}
}
func UdpWithTimeout(f float64) UdpServerOpt {
return func(config *udpServerConfig) {
config.timeout = utils.FloatSecondDuration(f)
}
}
func UdpWithContext(ctx context.Context) UdpServerOpt {
return func(config *udpServerConfig) {
config.ctx = ctx
}
}
func DebugMockUDP(rsp []byte) (string, int) {
return DebugMockUDPWithTimeout(1*time.Minute, rsp)
}
func DebugMockUDPProtocol(name string) (string, int) {
cfg := fp.NewConfig(fp.WithTransportProtos(fp.ParseStringToProto([]interface{}{"udp"}...)...))
blocks := fp.GetRuleBlockByServiceName(name, cfg)
var generate string
var err error
responses := make(map[string][][]byte)
for _, block := range blocks {
payload := block.Probe.Payload
for _, match := range block.Matched {
r := match.MatchRule.String()
log.Infof("ServiceName: [%s] , ProductVerbose: [%s]", match.ServiceName, match.ProductVerbose)
log.Infof("MatchRule: [%s]", r)
generate, err = regen.GenerateOne(r)
if err != nil {
continue
}
responses[payload] = append(responses[payload], convertToBytes(generate))
}
}
return DebugMockUDPFromScan(3*time.Minute, responses)
}
func DebugMockUDPFromScan(du time.Duration, responses map[string][][]byte) (string, int) {
addr := utils.GetRandomLocalAddr()
time.Sleep(time.Millisecond * 300)
host, port, _ := utils.ParseStringToHostPort(addr)
go func() {
conn, err := net.ListenPacket("udp", addr)
if err != nil {
panic(err)
}
defer conn.Close()
go func() {
time.Sleep(du)
conn.Close()
}()
buffer := make([]byte, 1024)
for {
n, addr, err := conn.ReadFrom(buffer)
if err != nil {
return
}
requestPayload := string(buffer[:n])
log.Infof("recv: %#v from: %v", requestPayload, addr.String())
if responses, ok := responses[requestPayload]; ok {
rand.NewSource(time.Now().UnixNano())
response := responses[rand.Intn(len(responses))]
log.Infof("send: %#v to: %v", string(response), addr.String())
conn.WriteTo(response, addr)
time.Sleep(50 * time.Millisecond)
}
}
}()
time.Sleep(time.Millisecond * 100)
return host, port
}
func convertToBytes(s string) []byte {
var result []byte
for _, r := range s {
if r > 127 || r < 32 || (r >= 0x7F && r <= 0xA0) { // ASCII 范围之外的字符
result = append(result, byte(r))
} else {
result = append(result, byte(r))
}
}
return result
}
func DebugMockUDPWithTimeout(du time.Duration, rsp []byte) (string, int) {
addr := utils.GetRandomLocalAddr()
time.Sleep(time.Millisecond * 300)
host, port, _ := utils.ParseStringToHostPort(addr)
go func() {
conn, err := net.ListenPacket("udp", addr)
if err != nil {
panic(err)
}
defer conn.Close()
go func() {
time.Sleep(du)
conn.Close()
}()
buffer := make([]byte, 1024)
for {
_, addr, err := conn.ReadFrom(buffer)
if err != nil {
return
}
conn.WriteTo(rsp, addr)
time.Sleep(50 * time.Millisecond)
}
}()
time.Sleep(time.Millisecond * 100)
return host, port
}