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# Generate /etc/resolv.conf
# Support resolvconf(8) if available
# We can merge other dhcpcd resolv.conf files into one like resolvconf,
# but resolvconf is preferred as other applications like VPN clients
# can readily hook into it.
# Also, resolvconf can configure local nameservers such as bind
# or dnsmasq. This is important as the libc resolver isn't that powerful.
resolv_conf_dir="${state_dir}/resolv.conf"
build_resolv_conf()
{
local cf="${state_dir}/resolv.conf.${interface}"
local interfaces= header= search= srvs= servers= x=
# Build a list of interfaces
interfaces=$(list_interfaces "${resolv_conf_dir}")
# Build the resolv.conf
if [ -n "${interfaces}" ]; then
# Build the header
for x in ${interfaces}; do
header="${header}${header:+, }${x}"
done
# Build the search list
domain=$(cd "${resolv_conf_dir}"; \
key_get_value "domain " ${interfaces})
search=$(cd "${resolv_conf_dir}"; \
key_get_value "search " ${interfaces})
set -- ${domain}
unset domain
if [ -n "$2" ]; then
search="${search} $@"
elif [ -n "$1" ]; then
domain="domain $1\n"
fi
[ -n "${search}" ] && search="search $(uniqify ${search})\n"
# Build the nameserver list
srvs=$(cd "${resolv_conf_dir}"; \
key_get_value "nameserver " ${interfaces})
for x in $(uniqify ${srvs}); do
servers="${servers}nameserver ${x}\n"
done
fi
header="${signature_base}${header:+ ${from} }${header}"
# Assemble resolv.conf using our head and tail files
[ -f "${cf}" ] && rm -f "${cf}"
echo "${header}" > "${cf}"
if [ -f /etc/resolv.conf.head ]; then
cat /etc/resolv.conf.head >> "${cf}"
else
echo "# /etc/resolv.conf.head can replace this line" >> "${cf}"
fi
printf "${domain}${search}${servers}" >> "${cf}"
if [ -f /etc/resolv.conf.tail ]; then
cat /etc/resolv.conf.tail >> "${cf}"
else
echo "# /etc/resolv.conf.tail can replace this line" >> "${cf}"
fi
cat "${cf}" > /etc/resolv.conf
chmod 644 /etc/resolv.conf
rm -f "${cf}"
}
add_resolv_conf()
{
local x= conf="${signature}\n"
# If we don't have any configuration, remove it
if [ -z "${new_domain_name_servers}" -a \
-z "${new_domain_name}" -a \
-z "${new_domain_search}" ]; then
remove_resolv_conf
return $?
fi
if [ -n "${new_domain_name}" ]; then
set -- ${new_domain_name}
new_domain_name="$1"
conf="${conf}domain ${new_domain_name}\n"
# Support RFC violating search in domain
if [ -z "${new_domain_search}" -a -n "$2" ]; then
new_domain_search="$@"
fi
fi
if [ -n "${new_domain_search}" ]; then
conf="${conf}search ${new_domain_search}\n"
fi
for x in ${new_domain_name_servers}; do
conf="${conf}nameserver ${x}\n"
done
if type resolvconf >/dev/null 2>&1; then
[ -n "${metric}" ] && export IF_METRIC="${metric}"
printf "${conf}" | resolvconf -a "${interface}"
return $?
fi
if [ -e "${resolv_conf_dir}/${interface}" ]; then
rm -f "${resolv_conf_dir}/${interface}"
fi
if [ ! -d "${resolv_conf_dir}" ]; then
mkdir -p "${resolv_conf_dir}"
fi
printf "${conf}" > "${resolv_conf_dir}/${interface}"
build_resolv_conf
}
remove_resolv_conf()
{
if type resolvconf >/dev/null 2>&1; then
resolvconf -d "${interface}" -f
else
if [ -e "${resolv_conf_dir}/${interface}" ]; then
rm -f "${resolv_conf_dir}/${interface}"
fi
build_resolv_conf
fi
}
case "${reason}" in
BOUND|INFORM|REBIND|REBOOT|RENEW|TIMEOUT|STATIC) add_resolv_conf;;
PREINIT|EXPIRE|FAIL|IPV4LL|NAK|NOCARRIER|RELEASE|STOP) remove_resolv_conf;;
esac
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