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Merge pull request #18 from MikeIsAStar/allow-for-older-matching-versions-to-be-used

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GPCM: Allow for older matching versions to be used
This commit is contained in:
Palapeli 2023-11-30 18:13:12 -05:00 committed by GitHub
commit 67a6a0046a
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1 changed files with 15 additions and 5 deletions
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20
gpcm/friend.go
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@ -174,20 +174,30 @@ func (g *GameSpySession) bestieMessage(command common.GameSpyCommand) {
}
// Parse message for security and room tracking purposes
if len(msg) < 10 || msg[0:4] != "GPCM" || msg[6:10] != "vMAT" {
if !strings.HasPrefix(msg, "GPCM") {
logging.Error(g.ModuleName, "Invalid message prefix")
g.replyError(ErrMessage)
return
}
if msg[4] < '1' || msg[4] > '9' || msg[5] < '0' || msg[5] >= '9' {
logging.Error(g.ModuleName, "Invalid message version number")
currentIndex := strings.Index(msg, "vMAT") + 4
isMessageHeaderValid := false
switch currentIndex {
case 9: // 1 - 9
isMessageHeaderValid = msg[4] >= '1' && msg[4] <= '9' && len(msg) >= 11
case 10: // 10 - 99
isMessageHeaderValid = msg[4] >= '1' && msg[4] <= '9' && msg[5] >= '0' && msg[5] <= '9' && len(msg) >= 12
}
if !isMessageHeaderValid {
logging.Error(g.ModuleName, "Invalid message header")
g.replyError(ErrMessage)
return
}
cmd := msg[10]
msgData, err := common.Base64DwcEncoding.DecodeString(msg[11:])
cmd := msg[currentIndex]
currentIndex++
msgData, err := common.Base64DwcEncoding.DecodeString(msg[currentIndex:])
if err != nil {
logging.Error(g.ModuleName, "Invalid message base64 data")
g.replyError(ErrMessage)