extract-updater-rofs.sh

@@ -1,10 +1,43 @@
 #   extract-updater-rofs
-# Extracts firmware CIAs from ROFS containers for some gigaleak SystemUpdaters.
+# Extracts firmware CIAs from ROFS containers for some gigaleak SystemUpdaters. Will accept "Contents.cnt" and decrypted "romfs.bin"
-# Place in same directory as an extracted "romfs.bin" OR "Contents.cnt"
+# Usage:     ./extract-updater-romfs <input file> (output directory) 
 
+###################################################################################
+# Set input and output paths
+###################################################################################
+OUTPUT_DIR="extract-updater-romfs_output"
+rm -r "extract-updater-romfs_output"
+mkdir "extract-updater-romfs_output"
+ERROR="0"
+if [ "${1}" != "" ]; then
+    INPUT_FILE="${1}"
+    if [ "${2}" != "" ]; then
+        OUTPUT_DIR="${2}"
+        rm -r "${OUTPUT_DIR}"
+        rm -r "extract-updater-romfs_output"
+        mkdir "${OUTPUT_DIR}"
+    fi
+else
+    echo "ERROR: No input files specified."
+    echo ""
+    echo "./extract-updater-rofs.sh <input> (output dir)"
+    echo ""
+    echo "Note that if the output directory already exists, IT WILL BE DELETED"
+    ERROR=1
+fi
+
+###################################################################################
+# CIA extraction
+###################################################################################
+if [ "$ERROR" == "0" ]; then
 echo "Finding CIA headers in file..."
-od -t x -A d romfs.bin | grep "00002020 00000000 00000a00 00000350" | sed 's/ .*//' | sed 's/^0*//' > romfs-dir.txt
+# od -t x -A d "${INPUT_FILE}" | grep "00002020 00000000 00000a00 00000350" | sed 's/ .*//' | sed 's/^0*//' > romfs-dir.txt
 # Get start address of every CIA header and store to file
+
+od -t x -A d "${INPUT_FILE}" | grep "00002020 00000000 00000000 00000378" | sed 's/ .*//' | sed 's/^0*//' > romfs-dir.txt
+# Different header for leftover cnt in "ctr.7z/ctr/sources/firmware/CTR-Kernel/updater1st/UpdaterCardImage/Default/Contents_11_without_shareddate.cnt"
+# I haven't seen this anywhere else so disable for everything but the above file.
+
 echo "Found all headers!"
 echo "================================================="
 
@@ -24,7 +57,7 @@ do
     x=0
     while [ "$y" = "00" ]; do
         x+=1
-        y=$(od -j $((NEXT_HEADER - x)) -N 1 -x -A n romfs.bin | sed 's|[ ,]||g' | sed 's/^..//');
+        y=$(od -j $((NEXT_HEADER - x)) -N 1 -x -A n "${INPUT_FILE}" | sed 's|[ ,]||g' | sed 's/^..//');
         # Get bytes one backwards from next header
         # printf '%x\n' $((NEXT_HEADER - x))
         # echo $y
@@ -35,7 +68,7 @@ do
     echo "Padding from CIA $i to $((i + 1)) is $((x - 1)) bytes."
     echo "    Extract CIA"
     CIA_LENGTH=$(((NEXT_HEADER - START_HEADER) - x + 1))
-    dd skip=${START_HEADER} count=${CIA_LENGTH} if=romfs.bin of="$i.cia" bs=1
+    dd skip=${START_HEADER} count=${CIA_LENGTH} if="${INPUT_FILE}" of="${OUTPUT_DIR}/$i.cia" bs=1
     echo "CIA $i saved as '$i.cia'"
     echo "================================================="
     i+=2
@@ -54,7 +87,7 @@ do
     x=0
     while [ "$y" = "00" ]; do
         x+=1
-        y=$(od -j $((NEXT_HEADER - x)) -N 1 -x -A n romfs.bin | sed 's|[ ,]||g' | sed 's/^..//');
+        y=$(od -j $((NEXT_HEADER - x)) -N 1 -x -A n "${INPUT_FILE}" | sed 's|[ ,]||g' | sed 's/^..//');
         # Get bytes one backwards from next header
         # printf '%x\n' $((NEXT_HEADER - x))
         # echo $y
@@ -65,7 +98,7 @@ do
     echo "Padding from CIA $i to $((i + 1)) is $((x - 1)) bytes."
     echo "    Extract CIA"
     CIA_LENGTH=$(((NEXT_HEADER - START_HEADER) - x + 1))
-    dd skip=${START_HEADER} count=${CIA_LENGTH} if=romfs.bin of="$i.cia" bs=1
+    dd skip=${START_HEADER} count=${CIA_LENGTH} if="${INPUT_FILE}" of="${OUTPUT_DIR}/$i.cia" bs=1
     echo "CIA $i output as '$i.cia', ${CIA_LENGTH} bytes."
     CIA_LENGTH=""
     echo "================================================="
@@ -73,9 +106,10 @@ do
 done
 
 START_HEADER=$( tail -n 1 romfs-dir.txt )
-NEXT_HEADER=$((16#$(xxd romfs.bin | grep "226e 6f6e 6522" | sed 's/: .*//' | sed 's/^0*//')));
+NEXT_HEADER=$((16#$(xxd "${INPUT_FILE}" | grep "226e 6f6e 6522" | sed 's/: .*//' | sed 's/^0*//')));
 # Find "226e 6f6e 6522" as it is the last predictable data to mark the end of Contents.cnt and the last CIA.
 # Upsettingly I have to use xxd because od wouldn't turn up any results for this... I liked od's formatting more :despair:
+
 if [ $NEXT_HEADER != "" ]; then
     echo "    Check CIA length"
     echo "Final CIA header at          ${START_HEADER}"
@@ -86,7 +120,7 @@ if [ $NEXT_HEADER != "" ]; then
     # Start x as 16 to skip changing data and go right to padding
     while [ "$y" = "00" ]; do
         x+=1
-        y=$(od -j $((NEXT_HEADER - x)) -N 1 -x -A n romfs.bin | sed 's|[ ,]||g' | sed 's/^..//');
+        y=$(od -j $((NEXT_HEADER - x)) -N 1 -x -A n "${INPUT_FILE}" | sed 's|[ ,]||g' | sed 's/^..//');
         # Get bytes one backwards from next header
         # printf '%x\n' $((NEXT_HEADER - x))
         # echo $y
@@ -97,9 +131,11 @@ if [ $NEXT_HEADER != "" ]; then
     echo "Padding from final CIA to Content.cnt end is $((x - 1)) bytes."
     echo "    Extract CIA"
     CIA_LENGTH=$(((NEXT_HEADER - START_HEADER) - x + 1))
-    dd skip=${START_HEADER} count=${CIA_LENGTH} if=romfs.bin of="0.cia" bs=1
+    dd skip=${START_HEADER} count=${CIA_LENGTH} if="${INPUT_FILE}" of="${OUTPUT_DIR}/0.cia" bs=1
     echo "Final CIA output as '0.cia', ${CIA_LENGTH} bytes."
     echo "================================================="
     echo "All CIAs extracted from RomFS!"
 else
     echo "Could not find end of last CIA! For extracting manually, start address is ${START_HEADER} (decimal)"
+fi
+fi