127 lines
3.5 KiB
Bash
Executable file
127 lines
3.5 KiB
Bash
Executable file
#!/bin/bash
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# Copyright (c) 2016 The Bitcoin Core developers
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# Distributed under the MIT software license, see the accompanying
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# file COPYING or http://www.opensource.org/licenses/mit-license.php.
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### This script attempts to download the signature file SHA256SUMS.asc from bitcoin.org
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### It first checks if the signature passes, and then downloads the files specified in
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### the file, and checks if the hashes of these files match those that are specified
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### in the signature file.
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### The script returns 0 if everything passes the checks. It returns 1 if either the
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### signature check or the hash check doesn't pass. If an error occurs the return value is 2
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function clean_up {
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for file in $*
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do
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rm "$file" 2> /dev/null
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done
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}
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WORKINGDIR="/tmp/bitcoin_verify_binaries"
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TMPFILE="hashes.tmp"
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SIGNATUREFILENAME="SHA256SUMS.asc"
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RCSUBDIR="test"
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BASEDIR="https://bitcoin.org/bin/"
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VERSIONPREFIX="bitcoin-core-"
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RCVERSIONSTRING="rc"
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if [ ! -d "$WORKINGDIR" ]; then
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mkdir "$WORKINGDIR"
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fi
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cd "$WORKINGDIR"
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#test if a version number has been passed as an argument
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if [ -n "$1" ]; then
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#let's also check if the version number includes the prefix 'bitcoin-',
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# and add this prefix if it doesn't
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if [[ $1 == "$VERSIONPREFIX"* ]]; then
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VERSION="$1"
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else
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VERSION="$VERSIONPREFIX$1"
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fi
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#now let's see if the version string contains "rc", and strip it off if it does
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# and simultaneously add RCSUBDIR to BASEDIR, where we will look for SIGNATUREFILENAME
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if [[ $VERSION == *"$RCVERSIONSTRING"* ]]; then
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BASEDIR="$BASEDIR${VERSION/%-$RCVERSIONSTRING*}/"
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BASEDIR="$BASEDIR$RCSUBDIR.$RCVERSIONSTRING${VERSION: -1}/"
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else
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BASEDIR="$BASEDIR$VERSION/"
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fi
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SIGNATUREFILE="$BASEDIR$SIGNATUREFILENAME"
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else
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echo "Error: need to specify a version on the command line"
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exit 2
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fi
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#first we fetch the file containing the signature
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WGETOUT=$(wget -N "$BASEDIR$SIGNATUREFILENAME" 2>&1)
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#and then see if wget completed successfully
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if [ $? -ne 0 ]; then
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echo "Error: couldn't fetch signature file. Have you specified the version number in the following format?"
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echo "[$VERSIONPREFIX]<version>-[$RCVERSIONSTRING[0-9]] (example: "$VERSIONPREFIX"0.10.4-"$RCVERSIONSTRING"1)"
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echo "wget output:"
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echo "$WGETOUT"|sed 's/^/\t/g'
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exit 2
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fi
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#then we check it
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GPGOUT=$(gpg --yes --decrypt --output "$TMPFILE" "$SIGNATUREFILENAME" 2>&1)
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#return value 0: good signature
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#return value 1: bad signature
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#return value 2: gpg error
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RET="$?"
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if [ $RET -ne 0 ]; then
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if [ $RET -eq 1 ]; then
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#and notify the user if it's bad
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echo "Bad signature."
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elif [ $RET -eq 2 ]; then
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#or if a gpg error has occurred
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echo "gpg error. Do you have the Bitcoin Core binary release signing key installed?"
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fi
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echo "gpg output:"
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echo "$GPGOUT"|sed 's/^/\t/g'
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clean_up $SIGNATUREFILENAME $TMPFILE
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exit "$RET"
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fi
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#here we extract the filenames from the signature file
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FILES=$(awk '{print $2}' "$TMPFILE")
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#and download these one by one
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for file in $FILES
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do
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wget --quiet -N "$BASEDIR$file"
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done
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#check hashes
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DIFF=$(diff <(sha256sum $FILES) "$TMPFILE")
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if [ $? -eq 1 ]; then
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echo "Hashes don't match."
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echo "Offending files:"
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echo "$DIFF"|grep "^<"|awk '{print "\t"$3}'
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exit 1
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elif [ $? -gt 1 ]; then
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echo "Error executing 'diff'"
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exit 2
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fi
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if [ -n "$2" ]; then
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echo "Clean up the binaries"
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clean_up $FILES $SIGNATUREFILENAME $TMPFILE
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else
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echo "Keep the binaries in $WORKINGDIR"
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clean_up $TMPFILE
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fi
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echo -e "Verified hashes of \n$FILES"
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exit 0
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