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#!/bin/bash
# Copyright (c) 2017 Gavin Li.
#
# Permission is hereby granted, free of charge, to any person obtaining a copy of
# this software and associated documentation files (the "Software"), to deal in
# the Software without restriction, including without limitation the rights to
# use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
# of the Software, and to permit persons to whom the Software is furnished to do
# so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in all
# copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
# SOFTWARE.
# DigitalOcean metadata API
# https://developers.digitalocean.com/documentation/metadata/
meta_base=http://169.254.169.254/metadata/v1/
set -eu
set -o pipefail
shopt -s nullglob
shopt -s dotglob
umask 022
log() {
logger -t digitalocean-synchronize "$@" || \
echo "[$(date)]" "$@" >&2
}
http_get() {
# Sometimes the API request fails with 'connection reset by peer'
curl --location --silent --fail --retry 3 --retry-all-errors "$@"
}
netmask_to_prefix() {
local pfx=0 cmp msk
for cmp in ${1//./ } 0; do
for msk in 128 64 32 16 8 4 2 1; do
if (( cmp & msk )); then
(( pfx += 1 ))
else
echo ${pfx}
return
fi
done
done
}
update_shadow_if_changed() {
local etcdir=$1/etc
mkdir -p ${etcdir} || return 0
if [ -e ${etcdir}/shadow ]; then
# change password if file was touched
local encrypted_password=$(awk -F: '$1 == "root" { print $2 }' ${etcdir}/shadow)
if [ "${encrypted_password}" != "z" ]; then
log "Snapshot restore detected."
usermod -p "${encrypted_password}" root
if [ ${#encrypted_password} -gt 1 ]; then
chage -d 0 root
fi
log "Password has been reset."
rm -f /etc/ssh/ssh_host_key /etc/ssh/ssh_host_*_key
log "SSH host keys will be regenerated."
fi
fi
cat > ${etcdir}/shadow <<-EOF
root:z:1::::::
nobody:z:1::::::
EOF
chmod 0600 ${etcdir}/shadow
}
process_interface() {
local url=$1
local attrs=$2
local mac=$(http_get -S ${url}mac)
local type=$(http_get -S ${url}type)
local interface=
local cand path
for cand in $(ls /sys/class/net); do
path=/sys/class/net/${cand}/address
if [ -e ${path} ] && [ "$(<${path})" = "${mac}" ]; then
interface=${cand}
break
fi
done
[ -n "${interface}" ] || return 0
mkdir -p /run/systemd/network
{
cat <<-EOF
# Generated by digitalocean-synchronize
[Match]
Name=${interface}
[Network]
EOF
if [[ " ${attrs} " =~ " ipv4/ " ]]; then
local address=$(http_get ${url}ipv4/address)
local prefix=$(netmask_to_prefix $(http_get ${url}ipv4/netmask))
echo "Address=${address}/${prefix}"
if [ "${type}" != "private" ]; then
echo "Gateway=$(http_get ${url}ipv4/gateway)"
fi
log "Added IPv4 address ${address}/${prefix} on ${interface}."
fi
if [[ " ${attrs} " =~ " anchor_ipv4/ " ]]; then
local address=$(http_get ${url}anchor_ipv4/address)
local prefix=$(netmask_to_prefix $(http_get ${url}anchor_ipv4/netmask))
echo "Address=${address}/${prefix}"
log "Added Anchor IPv4 address ${address}/${prefix} on ${interface}."
fi
if [[ " ${attrs} " =~ " ipv6/ " ]]; then
local address=$(http_get ${url}ipv6/address)
local prefix=$(http_get ${url}ipv6/cidr)
echo "Address=${address}/${prefix}"
if [ "${type}" != "private" ]; then
echo "Gateway=$(http_get ${url}ipv6/gateway)"
fi
log "Added IPv6 address ${address}/${prefix} on ${interface}."
fi
local network_tail=/etc/systemd/network/template/dosync-${interface}.network.tail
if [[ -r "${network_tail}" ]]; then
cat ${network_tail}
log "Appended user specified config for ${interface}."
fi
} > /run/systemd/network/dosync-${interface}.network
}
traverse_interfaces() {
local url=$1
set -- $(http_get -S ${url})
if [[ " $* " =~ " mac " ]]; then
process_interface ${url} "$*"
else
local dir
for dir in $*; do
# only want dirs with slash suffix
[ "${dir}" = "${dir%/}" ] && continue
traverse_interfaces ${url}${dir}
done
fi
}
setup_from_metadata_service() {
local sshkeys
if sshkeys=$(http_get -S ${meta_base}public-keys) && test -n "${sshkeys}"; then
[ -d /root/.ssh ] || mkdir -m 0700 /root/.ssh
[ -e /root/.ssh/authorized_keys ] || touch /root/.ssh/authorized_keys
if ! grep -q "${sshkeys}" /root/.ssh/authorized_keys; then
printf '\n%s\n' "${sshkeys}" >> /root/.ssh/authorized_keys
log "Added SSH public keys from metadata service."
fi
fi
local hostname
if ! test -e /etc/hostname && hostname=$(http_get -S ${meta_base}hostname); then
echo "${hostname}" > /etc/hostname
hostnamectl set-hostname "${hostname}"
log "Hostname set to ${hostname} from metadata service."
fi
traverse_interfaces ${meta_base}interfaces/
}
digitalocean_synchronize() {
if test -e /dev/disk/by-label/DOROOT && mkdir -p /mnt/doroot; then
mount /dev/disk/by-label/DOROOT /mnt/doroot
update_shadow_if_changed /mnt/doroot
umount /mnt/doroot
else
log "Unable to check DOROOT for snapshot check!"
fi
ip link set dev eth0 up
ip addr add dev eth0 169.254.169.252/30 2>/dev/null || true
local retry
for retry in {1..20}; do
log "Attempting to connect to metadata service ..."
if http_get -S -m 1 ${meta_base} >/dev/null; then
setup_from_metadata_service
break
else
log "Unable to connect to metadata service!"
sleep 1
fi
done
ip addr del dev eth0 169.254.169.252/30 2>/dev/null || true
}
digitalocean_synchronize
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