1#!/bin/echo Try "mkroot/mkroot.sh dropbear" 2 3# Example overlay file, adding dropbear (which requires zlib) 4 5echo === download source 6 7download f535367b1a11e2f9ac3bec723fb007fbc0d189e5 \ 8 https://www.zlib.net/fossils/zlib-1.3.1.tar.gz 9 10download 216ae176572dc008e128042eae82b6aacfdc8a51 \ 11 https://matt.ucc.asn.au/dropbear/releases/dropbear-2024.86.tar.bz2 12 13echo === Native build static zlib 14 15setupfor zlib 16# They keep checking in broken generated files. 17rm -f Makefile zconf.h && 18CC=${CROSS_COMPILE}cc LD=${CROSS_COMPILE}ld AS=${CROSS_COMPILE}as ./configure && 19make -j $(nproc) || exit 1 20 21# do _not_ cleanup zlib, we need the files we just built for dropbear 22 23echo === $HOST Native build static dropbear 24 25setupfor dropbear 26# Repeat after me: "autoconf is useless" 27echo 'echo "$@"' > config.sub && 28ZLIB="$(echo ../zlib*)" && 29CC="$CROSS_COMPILE"cc CFLAGS="-I $ZLIB -O2" LDFLAGS="-L $ZLIB" ./configure --enable-static \ 30 --disable-wtmp --host="$(basename "$CROSS_COMPILE" | sed 's/-$//')" && 31sed -i 's@/usr/bin/dbclient@ssh@;s@\(#define NON_INETD_MODE\) 1@\1 0@' \ 32 src/default_options.h && 33make -j $(nproc) PROGRAMS="dropbear dbclient dropbearkey dropbearconvert scp" MULTI=1 SCPPROGRESS=1 && 34${CROSS_COMPILE}strip dropbearmulti && 35mkdir -p "$ROOT"/{bin,etc/{rc,dropbear},var/log} && 36touch "$ROOT"/var/log/lastlog && 37cp dropbearmulti "$ROOT"/bin || exit 1 38for i in "$ROOT"/bin/{ssh,dropbear,scp,dropbearkey} 39do 40 ln -s dropbearmulti $i || exit 1 41done 42# We didn't cleanup zlib 43unset ZLIB 44rm -rf ../zlib-* 45# cleanup dropbear 46cleanup 47 48# user root password root, user guest no password 49echo -e 'root:$1$939UTPzb$/PfVYAsF2Hqi/AQ3UBjbK/:::::::\nguest::::::::' > "$ROOT"/etc/shadow && 50chmod 600 "$ROOT"/etc/shadow && 51 52echo 'netcat -p 22 -L dropbear -iRB &' > "$ROOT"/etc/rc/dropbear && 53 54# file to run on host to ssh into guest 55echo 'ssh -o "UserKnownHostsFile=/dev/null" -o "StrictHostKeyChecking=no" ${1:+$1@}127.0.0.1 -p 2222' > "$OUTPUT"/ssh2dropbear.sh && 56chmod +x "$OUTPUT"/ssh2dropbear.sh 57 58# Forward 127.0.0.1:2222 into qemu instance 59QEMU_MORE+=" -nic user,hostfwd=tcp:127.0.0.1:2222-:22" 60