From 54411bef4eb16af0822820205a923690ea7e822a Mon Sep 17 00:00:00 2001
From: Subv <subv2112@gmail.com>
Date: Mon, 17 Jul 2017 09:25:58 -0500
Subject: Services/UDS: Add functions to generate 802.11 auth and assoc
 response frames.

---
 src/core/hle/service/nwm/uds_connection.cpp | 79 +++++++++++++++++++++++++++++
 1 file changed, 79 insertions(+)
 create mode 100644 src/core/hle/service/nwm/uds_connection.cpp

(limited to 'src/core/hle/service/nwm/uds_connection.cpp')

diff --git a/src/core/hle/service/nwm/uds_connection.cpp b/src/core/hle/service/nwm/uds_connection.cpp
new file mode 100644
index 000000000..c8a76ec2a
--- /dev/null
+++ b/src/core/hle/service/nwm/uds_connection.cpp
@@ -0,0 +1,79 @@
+// Copyright 2017 Citra Emulator Project
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#include "core/hle/service/nwm/nwm_uds.h"
+#include "core/hle/service/nwm/uds_connection.h"
+#include "fmt/format.h"
+
+namespace Service {
+namespace NWM {
+
+// Note: These values were taken from a packet capture of an o3DS XL
+// broadcasting a Super Smash Bros. 4 lobby.
+constexpr u16 DefaultExtraCapabilities = 0x0431;
+
+std::vector<u8> GenerateAuthenticationFrame(AuthenticationSeq seq) {
+    AuthenticationFrame frame{};
+    frame.auth_seq = static_cast<u16>(seq);
+
+    std::vector<u8> data(sizeof(frame));
+    std::memcpy(data.data(), &frame, sizeof(frame));
+
+    return data;
+}
+
+AuthenticationSeq GetAuthenticationSeqNumber(const std::vector<u8>& body) {
+    AuthenticationFrame frame;
+    std::memcpy(&frame, body.data(), sizeof(frame));
+
+    return static_cast<AuthenticationSeq>(frame.auth_seq);
+}
+
+/**
+ * Generates an SSID tag of an 802.11 Beacon frame with an 8-byte character representation of the
+ * specified network id as the SSID value.
+ * @param network_id The network id to use.
+ * @returns A buffer with the SSID tag.
+ */
+static std::vector<u8> GenerateSSIDTag(u32 network_id) {
+    constexpr u8 SSIDSize = 8;
+
+    struct {
+        u8 id = static_cast<u8>(TagId::SSID);
+        u8 size = SSIDSize;
+    } tag_header;
+
+    std::vector<u8> buffer(sizeof(tag_header) + SSIDSize);
+
+    std::memcpy(buffer.data(), &tag_header, sizeof(tag_header));
+
+    std::string network_name = fmt::format("{0:08X}", network_id);
+
+    std::memcpy(buffer.data() + sizeof(tag_header), network_name.c_str(), SSIDSize);
+
+    return buffer;
+}
+
+std::vector<u8> GenerateAssocResponseFrame(AssocStatus status, u16 association_id, u32 network_id) {
+    AssociationResponseFrame frame{};
+    frame.capabilities = DefaultExtraCapabilities;
+    frame.status_code = static_cast<u16>(status);
+    // The association id is ORed with this magic value (0xC000)
+    constexpr u16 AssociationIdMagic = 0xC000;
+    frame.assoc_id = association_id | AssociationIdMagic;
+
+    std::vector<u8> data(sizeof(frame));
+    std::memcpy(data.data(), &frame, sizeof(frame));
+
+    auto ssid_tag = GenerateSSIDTag(network_id);
+    data.insert(data.end(), ssid_tag.begin(), ssid_tag.end());
+
+    // TODO(Subv): Add the SupportedRates tag.
+    // TODO(Subv): Add the DSParameterSet tag.
+    // TODO(Subv): Add the ERPInformation tag.
+    return data;
+}
+
+} // namespace NWM
+} // namespace Service
-- 
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