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Restore legacy FourCC reversal in LOGON_CHALLENGE

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Kelsi 2026-02-13 00:43:22 -08:00
parent fd0da4486d
commit 7e5fc0ed51
1 changed files with 11 additions and 10 deletions
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21
src/auth/auth_packets.cpp
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@ -25,13 +25,14 @@ network::Packet LogonChallengePacket::build(const std::string& account, const Cl
// Payload size
packet.writeUInt16(payloadSize);
// Write a 4-byte ASCII field (FourCC-ish): bytes are sent in-order and null-padded.
// Auth servers expect literal "x86\0", "Win\0", "enUS", etc (not reversed).
auto writeFourCC = [&packet](const std::string& str) {
// Write a FourCC-like 4-byte ASCII field in the legacy login wire format:
// reverse the characters and null-pad to 4 bytes.
// Example (1.12.1): platform "x86" is sent as bytes "68x\\0"; os "Win" as "niW\\0"; locale "enGB" as "BGne".
auto writeFourCCLE = [&packet](const std::string& str) {
uint8_t buf[4] = {0, 0, 0, 0};
size_t len = std::min<size_t>(4, str.length());
for (size_t i = 0; i < len; ++i) {
buf[i] = static_cast<uint8_t>(str[i]);
buf[i] = static_cast<uint8_t>(str[len - 1 - i]);
}
for (int i = 0; i < 4; ++i) {
packet.writeUInt8(buf[i]);
@ -58,14 +59,14 @@ network::Packet LogonChallengePacket::build(const std::string& account, const Cl
// Build (2 bytes)
packet.writeUInt16(info.build);
// Platform (4 bytes)
writeFourCC(info.platform);
// Platform (4 bytes, legacy reversed encoding)
writeFourCCLE(info.platform);
// OS (4 bytes)
writeFourCC(info.os);
// OS (4 bytes, legacy reversed encoding)
writeFourCCLE(info.os);
// Locale (4 bytes)
writeFourCC(info.locale);
// Locale (4 bytes, legacy reversed encoding)
writeFourCCLE(info.locale);
// Timezone
packet.writeUInt32(info.timezone);