From a211d8fc27d1eead97da48549072a1d03d961215 Mon Sep 17 00:00:00 2001
From: chaoskagami <chaos.kagami@gmail.com>
Date: Fri, 19 Aug 2016 17:44:11 -0400
Subject: [PATCH] Get NAND CID with loader for config file

---
 external/loader/loader.rsf       |  1 +
 external/loader/source/fsldr.c   | 17 +++++++++++++++++
 external/loader/source/fsldr.h   |  1 +
 external/loader/source/patcher.c | 18 +++++++++++++++++-
 4 files changed, 36 insertions(+), 1 deletion(-)

diff --git a/external/loader/loader.rsf b/external/loader/loader.rsf
index c2412b6..1abce90 100644
--- a/external/loader/loader.rsf
+++ b/external/loader/loader.rsf
@@ -112,6 +112,7 @@ AccessControlInfo:
   FileSystemAccess:
     - DirectSdmc
     - CtrNandRw
+    - CategoryFileSystemTool # For FSLDR_GetNandCID
 
 SystemControlInfo:
   SaveDataSize: 0KB # It doesn't use any save data.
diff --git a/external/loader/source/fsldr.c b/external/loader/source/fsldr.c
index ba55828..6414a34 100644
--- a/external/loader/source/fsldr.c
+++ b/external/loader/source/fsldr.c
@@ -116,3 +116,20 @@ FSLDR_OpenFileDirectly(Handle *out, FS_ArchiveID archiveId, FS_Path archivePath,
 
     return cmdbuf[1];
 }
+
+Result
+FSLDR_GetNandCid(u8* out, u32 length)
+{
+	u32 *cmdbuf = getThreadCommandBuffer();
+
+	cmdbuf[0] = IPC_MakeHeader(0x81A, 1, 2); // 0x81A0042
+	cmdbuf[1] = length;
+	cmdbuf[2] = IPC_Desc_Buffer(length, IPC_BUFFER_W);
+	cmdbuf[3] = (u32) out;
+
+	Result ret = 0;
+	if(R_FAILED(ret = svcSendSyncRequest(fsldrHandle)))
+		return ret;
+
+	return cmdbuf[1];
+}
diff --git a/external/loader/source/fsldr.h b/external/loader/source/fsldr.h
index 36dac0c..1d57a31 100644
--- a/external/loader/source/fsldr.h
+++ b/external/loader/source/fsldr.h
@@ -8,5 +8,6 @@ void fsldrExit(void);
 Result FSLDR_InitializeWithSdkVersion(Handle session, u32 version);
 Result FSLDR_SetPriority(u32 priority);
 Result FSLDR_OpenFileDirectly(Handle *out, FS_ArchiveID archiveId, FS_Path archivePath, FS_Path filePath, u32 openFlags, u32 attributes);
+Result FSLDR_GetNandCid(u8* out, u32 length);
 
 #endif
diff --git a/external/loader/source/patcher.c b/external/loader/source/patcher.c
index 9950b27..a94c2e8 100644
--- a/external/loader/source/patcher.c
+++ b/external/loader/source/patcher.c
@@ -48,9 +48,25 @@ load_config()
 {
     static Handle file;
     static u32 total;
+    static u32 cid[4];
+    static char config_file_path[] = SYSCONFDIR "/config-00000000";
+
+    if (!R_SUCCEEDED(FSLDR_GetNandCid((u8*)cid, 0x10))) {
+        return;
+    }
+
+    char* cfg = config_file_path;
+    while(cfg[1] != 0) cfg++;
+
+    // Get path of actual config.
+    while (cid[0]) {
+        cfg[0] = hexDigits[(uint32_t)(cid[0] & 0xF)];
+        cfg--;
+        cid[0] >>= 4;
+    }
 
     // Open file.
-    if (!R_SUCCEEDED(fileOpen(&file, ARCHIVE_SDMC, PATH_CONFIG, FS_OPEN_READ))) {
+    if (!R_SUCCEEDED(fileOpen(&file, ARCHIVE_SDMC, config_file_path, FS_OPEN_READ))) {
         // Failed to open.
         return;
     }
-- 
2.39.5