forked from lukevers/mc
/
scanserver.go
129 lines (102 loc) · 2.37 KB
/
scanserver.go
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package mcclient
import (
"fmt"
"net"
"strconv"
"strings"
"unicode/utf8"
)
type ScanServerResult struct {
ProtocolVersion int
MinecraftVersion string
MOTD string
PlayersOnline int
PlayersMax int
}
func ScanServer(addr string) (result *ScanServerResult, err error) {
if strings.Index(addr, ":") < 0 {
addr += ":25565"
}
conn, err := net.Dial("tcp", addr)
if err != nil {
return nil, err
}
defer conn.Close()
_, err = conn.Write([]byte{0xFE})
if err != nil {
return nil, err
}
data := make([]byte, 1024)
n, err := conn.Read(data)
if err != nil {
return nil, err
}
if data[0] != 0xFF {
return nil, fmt.Errorf("Expected kick packet (0xFF)")
}
realLen := 0
runes := make([]rune, 0, (n-3)/2)
for i := 3; i < n; i += 2 {
r := (rune(data[i]) << 8) | rune(data[i+1])
runes = append(runes, r)
realLen += utf8.RuneLen(r)
}
b := make([]byte, realLen)
pos := 0
for _, r := range runes {
pos += utf8.EncodeRune(b[pos:], r)
}
s := string(b)
/*
if strings.HasPrefix(s, "\xc2\xa7") {
parts := strings.Split(s, "\x00")
protocolVersion, err := strconv.ParseInt(parts[1], 10, 0)
if err != nil {
return nil, err
}
playersOnline, err := strconv.ParseInt(parts[4], 10, 0)
if err != nil {
return nil, err
}
playersMax, err := strconv.ParseInt(parts[5], 10, 0)
if err != nil {
return nil, err
}
result = &ScanServerResult{
ProtocolVersion: int(protocolVersion),
MinecraftVersion: parts[2],
MOTD: parts[3],
PlayersOnline: int(playersOnline),
PlayersMax: int(playersMax),
}
} else {*/
p := strings.LastIndex(s, "\xc2\xa7")
if p < 0 {
return nil, fmt.Errorf("Bad response message format")
}
playersMaxStr := s[p+2:]
s = s[:p]
p = strings.LastIndex(s, "\xc2\xa7")
if p < 0 {
return nil, fmt.Errorf("Bad response message format")
}
playersOnlineStr := s[p+2:]
s = s[:p]
playersOnline, err := strconv.ParseInt(playersOnlineStr, 10, 0)
if err != nil {
return nil, err
}
playersMax, err := strconv.ParseInt(playersMaxStr, 10, 0)
if err != nil {
return nil, err
}
result = &ScanServerResult{
ProtocolVersion: 39,
MinecraftVersion: "Unknown version",
MOTD: strings.Replace(s, "\xc3\x82\xc2\xa7", "\xc2\xa7", -1),
PlayersOnline: int(playersOnline),
PlayersMax: int(playersMax),
}
//}
return result, nil
}