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infra/image/system-services: Enhance checks, also fix reverse zone

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Checks for IPv4 addresses have been added and reverse zone handling
for fixipaip.sh

The services are logging StandardOutput and StandardError to journal
now.
This commit is contained in:
Thomas Woerner
2024-08-02 17:00:12 +02:00
parent 7dbe6edbf0
commit e05fbce04c
4 changed files with 115 additions and 17 deletions
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52
infra/image/system-service/fixnet.sh
View File

@@ -1,24 +1,62 @@
#!/bin/bash -eu
function valid_fqdn()
{
local name="${1}"
[[ "${name}" =~ [[:space:]] ]] && return 1
[[ "${name}" =~ \. ]] || return 1
[[ "${name}" =~ \.\. ]] && return 1
for i in ${name//./ }; do
[[ "${i}" =~ ^[a-z0-9_/]+$ ]] || return 1
done
[[ "${name}" == "localhost.localdomain" ]] && return 1
return 0
}
function valid_ipv4()
{
local ip="${1}"
local rematch="^([0-9]{1,3}\.){3}[0-9]{1,3}$"
[[ "${ip}" =~ ${rematch} ]] || return 1
for i in ${ip//./ }; do
[[ ${i} -le 255 ]] || return 1
done
return 0
}
HOSTNAME=$(hostname)
IP=$(hostname -I | cut -d " " -f 1)
if [ -z "${HOSTNAME}" ]; then
if [ -z "${HOSTNAME}" ] || ! valid_fqdn "${HOSTNAME}" ; then
echo "ERROR: Failed to retrieve hostname."
exit 1
fi
if [ -z "${IP}" ]; then
echo "ERROR: Failed to retrieve IP address."
if [ -z "${IP}" ] || ! valid_ipv4 "${IP}" ; then
echo "ERROR: Got invalid IPv4 address: '${IP}'"
exit 1
fi
# shellcheck disable=SC2143
if [ -n "$(grep -P "[[:space:]]${HOSTNAME}" /etc/hosts)" ]; then
sed -ie "s/.*${HOSTNAME}/${IP}\t${HOSTNAME}/" /etc/hosts
echo "Fix NET:"
echo " HOSTNAME: '${HOSTNAME}'"
echo " IP: '${IP}'"
echo
if grep -qE "^[^(#\s*)][0-9\.]+\s$HOSTNAME(\s|$)" /etc/hosts
then
sed -i.bak -e "s/.*${HOSTNAME}/${IP}\t${HOSTNAME}/" /etc/hosts
else
echo -e "$IP\t${HOSTNAME}" >> /etc/hosts
echo -e "$IP\t${HOSTNAME} ${HOSTNAME%%.*}" >> /etc/hosts
fi
echo "nameserver 127.0.0.1" > /etc/resolv.conf
echo "/etc/hosts:"
cat "/etc/hosts"
echo
echo "/etc/resolv.conf:"
cat "/etc/resolv.conf"
exit 0