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server.go
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server.go
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package server
import (
"crypto/tls"
"errors"
"fmt"
"log"
"net"
"path/filepath"
"strconv"
"sync"
"time"
"github.com/bluemods/kik-go-proxy/antispam"
"github.com/bluemods/kik-go-proxy/constants"
"github.com/bluemods/kik-go-proxy/node"
"github.com/bluemods/kik-go-proxy/ratelimit"
"github.com/bluemods/kik-go-proxy/server/connection"
)
type Server struct {
config *ServerConfig
connections *KikConnectionHolder
doneWaiter *sync.WaitGroup
}
// New builder for a server that will open a
// plain text connection on the given port.
func NewInsecure(port int) *ServerConfig {
if port < 0 || port > 0xFFFF {
log.Panicf("invalid port %d", port)
}
return &ServerConfig{
listener: func() (net.Listener, error) {
return net.Listen(constants.SERVER_TYPE, ":"+strconv.Itoa(port))
},
port: port,
tls: false,
}
}
// New builder for a server that will open a
// TLS (secure) connection on the given port with the given config.
func NewTLS(port int, config *tls.Config) *ServerConfig {
if port < 0 || port > 0xFFFF {
log.Panicf("invalid port %d", port)
}
return &ServerConfig{
listener: func() (net.Listener, error) {
return tls.Listen(constants.SERVER_TYPE, ":"+strconv.Itoa(port), config)
},
port: port,
tls: true,
}
}
// Awaits completion of the main loop, blocking the current goroutine.
func (s *Server) Await() {
s.doneWaiter.Wait()
}
func (s *Server) start() {
listener, err := s.config.listener()
if err != nil {
log.Println("failed to open socket", err)
return
}
if s.config.tls {
log.Printf("kik-go-proxy listening using \033[0;32mSSL\033[0m on :%d\n", s.config.port)
} else {
log.Printf("kik-go-proxy listening \033[0;31munencrypted\033[0m on :%d\n", s.config.port)
}
defer listener.Close()
for {
connection, err := listener.Accept()
if err != nil {
log.Println("Error accepting: " + err.Error())
} else {
go s.handleConnection(connection)
}
}
}
func (s *Server) handleConnection(clientConn net.Conn) {
defer clientConn.Close()
connId := s.connections.onConnected(clientConn)
defer s.connections.onDisconnected(connId)
ip, _, err := net.SplitHostPort(clientConn.RemoteAddr().String())
if err != nil {
// Shouldn't happen but being safe
log.Println("Rejecting connection, could not parse remote IP address")
return
}
clientConn.SetReadDeadline(time.Now().Add(constants.CLIENT_INITIAL_READ_TIMEOUT_SECONDS * time.Second))
k, shouldBan, err := node.ParseInitialStreamTag(clientConn)
if err != nil {
if shouldBan {
s.banIp(ip)
}
log.Println("Rejecting from " + ip + ": " + err.Error())
return
}
k.ClientIp = ip
if s.config.apiKey != nil && !s.isWhitelisted(k) {
apiKey := k.ApiKey
if apiKey == nil {
log.Println(ip + ": API key missing when required")
s.banIp(ip)
return
}
if !s.config.apiKey.Validate(*k.ApiKey) {
log.Println(ip + ": API key mismatch")
s.banIp(ip)
return
}
}
kikConn, err := s.dialKik(k)
if err != nil {
log.Printf("Failed to dial %s to Kik (IP:%s): %s\n", k.UserId(), ip, err.Error())
return
}
defer kikConn.Close()
if kikConn.LocalAddr() != nil {
log.Printf("Accepting %s (%s <=> %s)\n", k.UserId(), ip, kikConn.LocalAddr())
} else {
log.Printf("Accepting %s (IP: %s)\n", k.UserId(), ip)
}
kikConn.SetDeadline(time.Now().Add(constants.KIK_INITIAL_READ_TIMEOUT_SECONDS * time.Second))
var outgoingKTag string
if s.config.customStreamInitFunc != nil {
outgoingKTag = s.config.customStreamInitFunc(k)
} else {
outgoingKTag = k.RawStanza
}
if _, err = kikConn.Write([]byte(outgoingKTag)); err != nil {
log.Println("Failed to write bind stanza:", err.Error())
return
}
kikInput := node.NewNodeInputStream(kikConn)
defer kikInput.Reader.ClearBuffer()
kikResponse, err := node.ParseInitialStreamResponse(kikInput)
if err != nil {
log.Println("Failed to parse bind response:", err.Error())
return
}
clientConn.Write([]byte(kikResponse.GenerateServerResponse(s.config.customBanner)))
if !kikResponse.IsOk {
log.Println("Kik rejected bind:", kikResponse.RawStanza)
return
}
clientInput := node.NewNodeInputStream(clientConn)
defer clientInput.Reader.ClearBuffer()
rateLimiter := s.createRateLimiter(k)
logger := s.createXmppLogger(k)
c := &connection.KikProxyConnection{
UserId: k.UserId(),
IsAuthed: k.IsAuth,
ClientConn: clientConn,
ClientInput: clientInput,
KikConn: kikConn,
KikInput: kikInput,
RateLimiter: rateLimiter,
Logger: logger,
}
c.Run() // Blocks until connection is complete
}
func (s *Server) dialKik(k *node.InitialStreamTag) (*tls.Conn, error) {
kikHost, err := k.KikHost()
if err != nil {
s.banIp(k.ClientIp)
}
kikAddr := *kikHost + ":" + constants.KIK_SERVER_PORT
config := tls.Config{
ServerName: *kikHost,
MinVersion: constants.SERVER_TLS_VERSION,
}
dialer := net.Dialer{
Timeout: constants.KIK_INITIAL_READ_TIMEOUT_SECONDS * time.Second,
}
if k.InterfaceIp != nil {
if s.config.ifaceMap == nil {
return nil, errors.New("client requested to use interface when not supported")
}
tcpAddr, found := s.config.ifaceMap[*k.InterfaceIp]
if !found {
return nil, fmt.Errorf(
"failed connecting via custom interface; '%s' not found in allowlist %v", *k.InterfaceIp, s.config.ifaceMap)
}
dialer.LocalAddr = tcpAddr
}
if s.config.customDialerFunc != nil {
return s.config.customDialerFunc(k, &dialer, constants.KIK_SERVER_TYPE, kikAddr, &config)
}
return tls.DialWithDialer(&dialer, constants.KIK_SERVER_TYPE, kikAddr, &config)
}
func (s *Server) isWhitelisted(k *node.InitialStreamTag) bool {
_, ok := s.config.whitelist[k.UserId()]
return ok
}
func (s *Server) createRateLimiter(k *node.InitialStreamTag) *ratelimit.KikRateLimiter {
if s.config.antiSpamFunc == nil || !s.config.antiSpamFunc(k) {
return nil
}
return ratelimit.NewRateLimiter()
}
func (s *Server) createXmppLogger(k *node.InitialStreamTag) *connection.XmppLogger {
if s.config.xmppLogFunc == nil || !s.config.xmppLogFunc(k) {
return nil
}
outPath := filepath.Join("xmpp", filepath.Clean(k.UserId()))
logger, err := connection.NewXmppLogger(outPath)
if err != nil {
log.Println("failed to create XMPP logger: ", outPath)
}
return logger
}
func (s *Server) banIp(ip string) {
if s.config.autoBanHosts {
antispam.BanIpAddress(ip)
s.connections.DisconnectIp(ip)
}
}