| # 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="${state_dir}/resolv.conf" |
| |
| build_resolv_conf() |
| { |
| local cf="/etc/resolv.conf.${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 |
| search=$(cd "${resolv_conf_dir}"; \ |
| key_get_value "search " ${interfaces}) |
| [ -n "${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 "${search}${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" >> "${cf}" |
| fi |
| mv -f "${cf}" /etc/resolv.conf |
| } |
| |
| 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_search}" ]; then |
| conf="${conf}search ${new_domain_search}\n" |
| elif [ -n "${new_domain_name}" ]; then |
| conf="${conf}search ${new_domain_name}\n" |
| fi |
| for x in ${new_domain_name_servers}; do |
| conf="${conf}nameserver ${x}\n" |
| done |
| if type resolvconf >/dev/null 2>&1; then |
| printf "${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) add_resolv_conf;; |
| PREINIT|EXPIRE|FAIL|IPV4LL|RELEASE|STOP) remove_resolv_conf;; |
| esac |