93 lines
2.3 KiB
Bash
Executable File
93 lines
2.3 KiB
Bash
Executable File
#!/bin/bash
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# SPDX-License-Identifier: CC0-1.0
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# 2023 Thilo-Alexander Ginkel <thilo@ginkel.com>
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#
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# Lenovo-shipped Fibocom FM350-GL (14c3:4d75) FCC unlock
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if [[ "$FCC_UNLOCK_DEBUG_LOG" == '1' ]]; then
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exec 3>&1 4>&2
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trap 'exec 2>&4 1>&3' 0 1 2 3
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exec 1>>/var/log/mm-fm350-fcc.log 2>&1
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fi
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# require program name and at least 2 arguments
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[ $# -lt 2 ] && exit 1
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# first argument is DBus path, not needed here
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shift
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# second and next arguments are control port names
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for PORT in "$@"; do
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# match port type in Linux 5.14 and newer
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grep -q AT "/sys/class/wwan/$PORT/type" 2>/dev/null && {
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AT_PORT=$PORT
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break
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}
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# match port name in Linux 5.13
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echo "$PORT" | grep -q AT && {
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AT_PORT=$PORT
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break
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}
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done
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# fail if no AT port exposed
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[ -n "$AT_PORT" ] || exit 2
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DEVICE=/dev/${AT_PORT}
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at_command() {
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exec 99<>"$DEVICE"
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echo -e "$1\r" >&99
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read answer <&99
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read answer <&99
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echo "$answer"
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exec 99>&-
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}
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log() {
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echo "$1"
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}
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error() {
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echo "$1" >&2
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}
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VENDOR_ID_HASH="3df8c719"
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for i in {1..9}; do
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log "Requesting challenge from WWAN modem (attempt #${i})"
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RAW_CHALLENGE=$(at_command "at+gtfcclockgen")
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CHALLENGE=$(echo "$RAW_CHALLENGE" | grep -o '0x[0-9a-fA-F]\+' | awk '{print $1}')
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if [ -n "$CHALLENGE" ]; then
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log "Got challenge from modem: $CHALLENGE"
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HEX_CHALLENGE=$(printf "%08x" "$CHALLENGE")
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COMBINED_CHALLENGE="${HEX_CHALLENGE}$(printf "%.8s" "${VENDOR_ID_HASH}")"
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RESPONSE_HASH=$(echo "$COMBINED_CHALLENGE" | xxd -r -p | sha256sum | cut -d ' ' -f 1)
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TRUNCATED_RESPONSE=$(printf "%.8s" "$RESPONSE_HASH")
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RESPONSE=$(printf "%d" "0x$TRUNCATED_RESPONSE")
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log "Sending response to WWAN modem: $RESPONSE"
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UNLOCK_RESPONSE=$(at_command "at+gtfcclockver=$RESPONSE")
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if [[ "$UNLOCK_RESPONSE" == "+GTFCCLOCKVER:"* ]]; then
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UNLOCK_RESULT=$(echo "$UNLOCK_RESPONSE" | grep -o '[0-9]\+')
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if [[ "$UNLOCK_RESULT" == "1" ]]; then
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log "FCC unlock succeeded"
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exit 0
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else
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error "FCC unlock failed. Got result: $UNLOCK_RESULT"
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fi
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else
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error "Unlock failed. Got response: $UNLOCK_RESPONSE"
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fi
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else
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error "Failed to obtain FCC challenge. Got: ${RAW_CHALLENGE}"
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fi
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sleep 0.5
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done
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exit 2
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