58 lines
2.1 KiB
Bash
58 lines
2.1 KiB
Bash
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#!/system/bin/sh
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# CellGuard — late service script
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#
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# Primary goal: (1) prevent cellular downgrade — hold the modem to LTE + 5G(NR)
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# only; (2) detect IMSI-catchers / cell-site simulators from the modem's own
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# CP<->AP diagnostic stream.
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#
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# On rango (Shannon S5400 / cpif, PCIe) there is NO raw-AT tty and no exposed
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# SIT command to inject, so:
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# * enforcement uses the platform telephony API (ratlock.sh)
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# * diagnostics use a kernel capture module (cgcap.ko) that taps every cpif
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# channel and exposes the raw frames at /proc/cgcap/frames
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# * decode + CSS heuristics run in userspace (tools/cg_decode.py)
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MODDIR=${0%/*}
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CONFIG_DIR="/data/adb/cellguard"
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LOG="$CONFIG_DIR/cellguard.log"
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KMOD="$MODDIR/common/kmod/cgcap.ko"
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mkdir -p "$CONFIG_DIR"
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log() { echo "[$(date '+%Y-%m-%d %H:%M:%S')] $1" >> "$LOG"; }
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log "CellGuard service start"
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# --- 1. diagnostics: load the CP-frame capture module ---
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if lsmod 2>/dev/null | grep -q '^cgcap '; then
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log "cgcap already loaded"
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elif [ -f "$KMOD" ]; then
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insmod "$KMOD" 2>>"$LOG" && log "cgcap.ko loaded (diag at /proc/cgcap/frames)" \
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|| log "cgcap.ko insmod FAILED — check dmesg (is cpif up?)"
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else
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log "cgcap.ko missing at $KMOD — build it first"
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fi
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# --- 2. enforcement: hold every active SIM to LTE + 5G(NR) only ---
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# ratlock runs its own watchdog loop; launch once, in background.
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if ! pgrep -f "$MODDIR/ratlock.sh" >/dev/null 2>&1; then
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# wait briefly for RIL/subscriptions to come up after boot
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for i in $(seq 1 30); do
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[ -n "$(cmd phone get-allowed-network-types-for-users -s 0 2>/dev/null)$(cmd phone get-allowed-network-types-for-users -s 1 2>/dev/null)" ] && break
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sleep 1
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done
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nohup sh "$MODDIR/ratlock.sh" 5 >/dev/null 2>&1 &
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log "ratlock started (LTE+NR/5G enforcement watchdog)"
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else
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log "ratlock already running"
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fi
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# --- 3. detection: always-on IMSI-catcher detector (independent of WebUI) ---
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if ! pgrep -f "$MODDIR/cgdetect.sh" >/dev/null 2>&1; then
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nohup sh "$MODDIR/cgdetect.sh" 4 >/dev/null 2>&1 &
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log "cgdetect started (always-on IMSI-catcher detector)"
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else
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log "cgdetect already running"
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fi
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log "CellGuard service done"
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