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fcc-unlock: Transition the 14c3 FCC unlock script to use sh

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This enables the usage with busybox and strict environments.

This is related to #483 and the previous commit 91ed72aa, 02baf283.

Signed-off-by: Jongmin Kim <jmkim@debian.org>
This commit is contained in:
Jongmin Kim
2025-03-29 22:24:48 +09:00
parent f9e63c7940
commit 2836eab097
1 changed files with 30 additions and 33 deletions
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data/dispatcher-fcc-unlock/14c3
+30 -33
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@@ -1,15 +1,16 @@
#!/bin/bash
#!/bin/sh
# SPDX-License-Identifier: CC0-1.0
# 2023 Thilo-Alexander Ginkel <thilo@ginkel.com>
# 2025 Jongmin Kim <jmkim@debian.org>
#
# Lenovo-shipped Fibocom FM350-GL (14c3:4d75) FCC unlock
if [[ "$FCC_UNLOCK_DEBUG_LOG" == '1' ]]; then
[ "$FCC_UNLOCK_DEBUG_LOG" = '1' ] && {
exec 3>&1 4>&2
trap 'exec 2>&4 1>&3' 0 1 2 3
exec 1>>/var/log/mm-fm350-fcc.log 2>&1
fi
exec 1>>'/var/log/mm-fm350-fcc.log' 2>&1
}
# require program name and at least 2 arguments
[ $# -lt 2 ] && exit 1
@@ -34,12 +35,12 @@ done
DEVICE="/dev/$AT_PORT"
at_command() {
exec 99<>"$DEVICE"
echo -e "$1\r" >&99
read answer <&99
read answer <&99
exec 9<>"$DEVICE"
printf "%s\r" "$1" >&9
read answer <&9
read answer <&9
echo "$answer"
exec 99>&-
exec 9>&-
}
log() {
@@ -50,40 +51,36 @@ error() {
echo "$1" >&2
}
VENDOR_ID_HASH="3df8c719"
VENDOR_ID_HASH='3df8c719'
for i in {1..9}; do
log "Requesting challenge from WWAN modem (attempt #${i})"
RAW_CHALLENGE=$(at_command "at+gtfcclockgen")
CHALLENGE=$(echo "$RAW_CHALLENGE" | grep -o '0x[0-9a-fA-F]\+' | awk '{print $1}')
i=1
while [ "$i" -le 9 ]; do
log "Requesting challenge from WWAN modem (attempt #$i)"
RAW_CHALLENGE="$(at_command 'at+gtfcclockgen')"
CHALLENGE="$(echo "$RAW_CHALLENGE" | grep -o '0x[0-9a-fA-F]\+' | awk '{print $1}')"
if [ -n "$CHALLENGE" ]; then
[ -n "$CHALLENGE" ] && {
log "Got challenge from modem: $CHALLENGE"
HEX_CHALLENGE=$(printf "%08x" "$CHALLENGE")
COMBINED_CHALLENGE="${HEX_CHALLENGE}$(printf "%.8s" "${VENDOR_ID_HASH}")"
RESPONSE_HASH=$(echo "$COMBINED_CHALLENGE" | xxd -r -p | sha256sum | cut -d ' ' -f 1)
TRUNCATED_RESPONSE=$(printf "%.8s" "$RESPONSE_HASH")
RESPONSE=$(printf "%d" "0x$TRUNCATED_RESPONSE")
HEX_CHALLENGE="$(printf '%08x' "$CHALLENGE")"
COMBINED_CHALLENGE="$HEX_CHALLENGE$(printf '%.8s' "$VENDOR_ID_HASH")"
RESPONSE_HASH="$(echo "$COMBINED_CHALLENGE" | xxd -r -p | sha256sum | cut -d ' ' -f 1)"
TRUNCATED_RESPONSE="$(printf '%.8s' "$RESPONSE_HASH")"
RESPONSE="$(printf '%d' "0x$TRUNCATED_RESPONSE")"
log "Sending response to WWAN modem: $RESPONSE"
UNLOCK_RESPONSE=$(at_command "at+gtfcclockver=$RESPONSE")
UNLOCK_RESPONSE="$(at_command "at+gtfcclockver=$RESPONSE")"
if [[ "$UNLOCK_RESPONSE" == "+GTFCCLOCKVER:"* ]]; then
UNLOCK_RESULT=$(echo "$UNLOCK_RESPONSE" | grep -o '[0-9]\+')
if [[ "$UNLOCK_RESULT" == "1" ]]; then
echo "$UNLOCK_RESPONSE" | grep -q '^+GTFCCLOCKVER:' && {
UNLOCK_RESULT="$(echo "$UNLOCK_RESPONSE" | grep -o '[0-9]*')"
[ "$UNLOCK_RESULT" = '1' ] && {
log "FCC unlock succeeded"
exit 0
else
error "FCC unlock failed. Got result: $UNLOCK_RESULT"
fi
else
error "Unlock failed. Got response: $UNLOCK_RESPONSE"
fi
else
error "Failed to obtain FCC challenge. Got: ${RAW_CHALLENGE}"
fi
} || error "FCC unlock failed. Got result: $UNLOCK_RESULT"
} || error "Unlock failed. Got response: $UNLOCK_RESPONSE"
} || error "Failed to obtain FCC challenge. Got: $RAW_CHALLENGE"
sleep 0.5
i="$((i + 1))"
done
exit 2