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client.go
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client.go
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package main
import (
"bytes"
"encoding/binary"
"flag"
"fmt"
"net"
"strings"
"time"
"github.com/ei-projects/eimaster/pkg/eimasterlib"
"github.com/ei-projects/eimaster/pkg/lzevil"
"github.com/spf13/cobra"
)
var clientCmds = []*cobra.Command{
{
Use: "get [flags]",
Short: "Get list of servers",
DisableFlagParsing: true,
Run: func(cmd *cobra.Command, args []string) {
getCommand(args)
},
},
{
Use: "send [flags]",
Short: "Send a fake server",
DisableFlagParsing: true,
Run: func(cmd *cobra.Command, args []string) {
sendCommand(args)
},
},
}
func getServers(addr string, nicks bool, verbose bool) {
tcpAddr, err := net.ResolveTCPAddr("tcp", addr)
if err != nil {
log.Fatalf("ResolveTCPAddr failed: %s", err.Error())
}
conn, err := net.DialTCP("tcp", nil, tcpAddr)
if err != nil {
log.Fatalf("DialTCP failed: %s", err.Error())
}
err = binary.Write(conn, binary.LittleEndian, uint32(0xDEADBEEF))
if err != nil {
log.Fatalf("conn.Write failed: %s", err.Error())
}
var inputSize int32
err = binary.Read(conn, binary.LittleEndian, &inputSize)
if err != nil || inputSize < 0 || inputSize > 100000 {
log.Fatalf("conn.Read failed: %s", err.Error())
}
lzreader := lzevil.NewReader(conn)
var servers []eimasterlib.EIServerInfo
if err := eimasterlib.ReadServersList(lzreader, false, &servers); err != nil {
log.Fatalf("Fail to read servers: %s", err.Error())
}
pingServers(servers)
fmt.Printf(
"%-12s %-8s %-6s %-9s %-22v %-6s ",
"Name", "Players", "Allod", "Password", "Address", "Ping")
if verbose {
fmt.Printf("%-9s %-9s ", "#UsrID#", "#UsrToken#")
}
fmt.Printf("%s\n", "Quest")
for _, srv := range servers {
fmt.Printf("%-12s %-8s %-6d %-9v %-22v %-6d ",
srv.Name,
fmt.Sprintf("%d / %d", srv.PlayersCount, srv.MaxPlayersCount),
srv.AllodIndex,
srv.HasPassword,
srv.Addr.String(),
srv.Ping,
)
if verbose {
fmt.Printf("%-09X %-09X ", srv.ClientID, srv.MasterToken)
}
fmt.Printf("%s\n", srv.Quest)
if nicks {
for _, name := range srv.PlayerNames {
println(" ", name)
}
}
}
}
func getCommand(args []string) {
flagSet := flag.NewFlagSet("get", flag.ExitOnError)
nicksFlag := flagSet.Bool("nicks", false, "Print player names")
verboseFlag := flagSet.Bool("verbose", false, "Print verbose information")
flagSet.Usage = func() {
println("Usage: eimaster client get [-nicks] [-verbose] [--] <addr>\n")
println("Get servers list from specified master server\n")
println("Arguments:")
flagSet.PrintDefaults()
println(" addr")
println(" Master server address\n")
}
flagSet.Parse(args)
if !flagSet.Parsed() {
log.Fatalln("Invalid arguments for 'get' command. " +
"Try 'client get -h' for mor information")
}
if flagSet.NArg() < 1 {
log.Fatalln("Not enough arguments for 'get' command. " +
"Try 'client get -h' for mor information")
}
addr := flagSet.Arg(0)
if !strings.Contains(addr, ":") {
addr += ":28004"
}
getServers(addr, *nicksFlag, *verboseFlag)
}
func sendCommand(args []string) {
flagSet := flag.NewFlagSet("get", flag.ExitOnError)
nicksFlag := flagSet.Bool("nicks", false, "Send with player names")
sourceAddFlag := flagSet.String("saddr", ":0", "Source UDP address")
flagSet.Usage = func() {
println("Usage: eimaster client send [-nicks] [--] <addr>\n")
println("Send a fake server info to specified master server\n")
println("Arguments:")
flagSet.PrintDefaults()
println(" addr")
println(" Master server address\n")
}
flagSet.Parse(args)
if !flagSet.Parsed() {
log.Fatalln("Invalid arguments for 'get' command. " +
"Try 'client get -h' for mor information")
}
if flagSet.NArg() < 1 {
log.Fatalln("Not enough arguments for 'get' command. " +
"Try 'client get -h' for mor information")
}
masterAddr := flagSet.Arg(0)
if !strings.Contains(masterAddr, ":") {
masterAddr += ":28004"
}
sourceAddr, err := net.ResolveUDPAddr("udp", *sourceAddFlag)
if err != nil {
log.Fatalf("Failed to resolve %s addr: %v", *sourceAddFlag, err)
}
udpAddr, err := net.ResolveUDPAddr("udp", masterAddr)
if err != nil {
log.Fatalf("Failed to resolve %s addr: %v", masterAddr, err)
}
game := eimasterlib.EIGameInfo{
ClientID: 0xABBACAFE,
MasterToken: 0,
Name: "Fake server",
Quest: "Fake quest",
PlayersCount: 0,
MaxPlayersCount: 13,
HasPassword: true,
AllodIndex: 5,
PlayerNames: []string{"fake1", "fake2", "fake3"},
}
conn, err := net.DialUDP("udp", sourceAddr, udpAddr)
if err != nil {
log.Fatalf("net.DialUDP failed: %s", err)
}
conn.SetDeadline(time.Now().Add(2000 * time.Millisecond))
var buf bytes.Buffer
eimasterlib.WriteGameInfo(&buf, false, &game)
log.Debugf("Sending fake game:\n%s", getHexDump(buf.Bytes()))
n, err := conn.Write(buf.Bytes())
if n < buf.Len() || err != nil {
log.Fatalf("conn.Write failed: %s. %d bytes were written", err, n)
}
recvBuf := make([]byte, 128)
n, err = conn.Read(recvBuf)
if n == 0 || err != nil {
log.Fatalf("Master server hasn't answered: %s, %d", err, n)
}
log.Debugf("Response from master:\n%s", getHexDump(recvBuf[:n]))
err = eimasterlib.ReadMasterResponse(bytes.NewReader(recvBuf), &game)
if err != nil {
log.Fatalf("Failed to parse response from master server: %s", err.Error())
}
log.Debugf("Received password for master server: %08X", game.MasterToken)
buf.Reset()
eimasterlib.WriteGameInfo(&buf, *nicksFlag, &game)
log.Debugf("Sending fake game again with password:\n%s", getHexDump(buf.Bytes()))
n, err = conn.Write(buf.Bytes())
if n < buf.Len() || err != nil {
log.Fatalf("conn.Write failed: %s. %d bytes were written", err, n)
}
}