From 5b2a9f6136e5f26b22e8113795732096cb445de8 Mon Sep 17 00:00:00 2001
From: TuxSH <1922548+TuxSH@users.noreply.github.com>
Date: Sat, 16 Sep 2023 21:22:37 +0200
Subject: [PATCH] ac: add SSID-related ac:i functions

ACI_LoadNetworkSetting and ACI_GetNetworkWirelessEssidSecuritySsid, plus acGetSessionHandle.
---
 libctru/include/3ds/services/ac.h | 15 ++++++++++++
 libctru/source/services/ac.c      | 39 +++++++++++++++++++++++++++++++
 2 files changed, 54 insertions(+)

diff --git a/libctru/include/3ds/services/ac.h b/libctru/include/3ds/services/ac.h
index bc1ad79c8..a39f389d7 100644
--- a/libctru/include/3ds/services/ac.h
+++ b/libctru/include/3ds/services/ac.h
@@ -27,6 +27,9 @@ Result acInit(void);
 /// Exits AC.
 void acExit(void);
 
+/// Gets the current AC session handle.
+Handle *acGetSessionHandle(void);
+
 /// Waits for the system to connect to the internet.
 Result acWaitInternetConnection(void);
 
@@ -128,3 +131,15 @@ Result ACU_SetRequestEulaVersion(acuConfig* config);
  * @param connectionHandle Handle created with svcCreateEvent to wait on until the connection succeeds or fails.
  */
 Result ACU_ConnectAsync(const acuConfig* config, Handle connectionHandle);
+
+/**
+ * @brief Selects the WiFi configuration slot for further ac:i operations.
+ * @param slot WiFi slot (0, 1 or 2).
+ */
+Result ACI_LoadNetworkSetting(u32 slot);
+
+/**
+ * @brief Fetches the SSID of the previously selected WiFi configuration slot.
+ * @param[out] ssid Pointer to the output buffer of size 32B the SSID will be stored in.
+ */
+Result ACI_GetNetworkWirelessEssidSecuritySsid(void *ssid);
diff --git a/libctru/source/services/ac.c b/libctru/source/services/ac.c
index 007a70cca..db04f0794 100644
--- a/libctru/source/services/ac.c
+++ b/libctru/source/services/ac.c
@@ -6,6 +6,7 @@
 #include <3ds/synchronization.h>
 #include <3ds/services/ac.h>
 #include <3ds/ipc.h>
+#include <string.h>
 
 static Handle acHandle;
 static int acRefCount;
@@ -30,6 +31,11 @@ void acExit(void)
 	svcCloseHandle(acHandle);
 }
 
+Handle *acGetSessionHandle(void)
+{
+	return &acHandle;
+}
+
 Result acWaitInternetConnection(void)
 {
 	Result ret = 0;
@@ -284,3 +290,36 @@ Result ACU_GetProxyUserName(char *username)
 
 	return (Result)cmdbuf[1];
 }
+
+Result ACI_LoadNetworkSetting(u32 slot)
+{
+    u32 *cmdbuf = getThreadCommandBuffer();
+
+    cmdbuf[0] = IPC_MakeHeader(0x401,1,0); // 0x04010040
+    cmdbuf[1] = slot;
+
+    Result ret = 0;
+    if(R_FAILED(ret = svcSendSyncRequest(acHandle))) return ret;
+
+    return (Result)cmdbuf[1];
+}
+
+Result ACI_GetNetworkWirelessEssidSecuritySsid(void *ssid)
+{
+    u32* cmdbuf = getThreadCommandBuffer();
+    u32* staticbufs = getThreadStaticBuffers();
+
+    cmdbuf[0] = IPC_MakeHeader(0x40F,0,0); // 0x040F0000
+
+    u32 staticbufBackup[2];
+    memcpy(staticbufBackup, staticbufs, 8);
+
+    staticbufs[0] = IPC_Desc_StaticBuffer(0x20, 0); // at most 32 bytes
+    staticbufs[1] = (u32)ssid;
+
+    Result ret = svcSendSyncRequest(acHandle);
+
+    memcpy(staticbufs, staticbufBackup, 8);
+
+    return R_SUCCEEDED(ret) ? (Result)cmdbuf[1] : ret;
+}