| # 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="$state_dir/resolv.conf" |
| NL=" |
| " |
| |
| build_resolv_conf() |
| { |
| local cf="$state_dir/resolv.conf.$ifname" |
| local interfaces= header= search= srvs= servers= x= |
| |
| # Build a list of interfaces |
| interfaces=$(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} |
| domain="$1" |
| [ -n "$2" ] && search="$search $*" |
| [ -n "$search" ] && search="$(uniqify $search)" |
| [ "$domain" = "$search" ] && search= |
| [ -n "$domain" ] && domain="domain $domain$NL" |
| [ -n "$search" ] && search="search $search$NL" |
| |
| # Build the nameserver list |
| srvs=$(cd "$resolv_conf_dir"; \ |
| key_get_value "nameserver " ${interfaces}) |
| for x in $(uniqify ${srvs}); do |
| servers="${servers}nameserver $x$NL" |
| done |
| fi |
| header="$signature_base${header:+ $from }$header" |
| |
| # Assemble resolv.conf using our head and tail files |
| [ -f "$cf" ] && rm -f "$cf" |
| [ -d "$resolv_conf_dir" ] || mkdir -p "$resolv_conf_dir" |
| 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 %s "$domain$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 |
| if change_file /etc/resolv.conf "$cf"; then |
| chmod 644 /etc/resolv.conf |
| fi |
| rm -f "$cf" |
| } |
| |
| add_resolv_conf() |
| { |
| local x= conf="$signature$NL" i=${ra_count:-0} ra= warn=true |
| |
| while [ $i -ne 0 ]; do |
| eval ra=\$ra${i}_rdnss |
| new_domain_name_servers="$new_domain_name_servers${new_domain_name_servers:+ }$ra" |
| eval ra=\$ra${i}_dnssl |
| new_domain_search="$new_domain_search${new_domain_search:+ }$ra" |
| i=$(($i - 1)) |
| done |
| |
| # If we don't have any configuration, remove it |
| if [ -z "$new_domain_name_servers" -a \ |
| -z "$new_domain_name" -a \ |
| -z "$new_domain_search" ]; then |
| remove_resolv_conf |
| return $? |
| fi |
| |
| # Derive a new domain from our various hostname options |
| if [ -z "$new_domain_name" ]; then |
| if [ "$new_dhcp6_fqdn" != "${new_dhcp6_fqdn#*.}" ]; then |
| new_domain_name="${new_dhcp6_fqdn#*.}" |
| elif [ "$new_fqdn" != "${new_fqdn#*.}" ]; then |
| new_domain_name="${new_fqdn#*.}" |
| elif [ "$new_host_name" != "${new_host_name#*.}" ]; then |
| new_domain_name="${new_host_name#*.}" |
| fi |
| fi |
| |
| if [ -n "$new_domain_name" ]; then |
| set -- $new_domain_name |
| if valid_domainname "$1"; then |
| conf="${conf}domain $1$NL" |
| else |
| syslog err "Invalid domain name: $1" |
| fi |
| # If there is no search this, make this one |
| if [ -z "$new_domain_search" ]; then |
| new_domain_search="$new_domain_name" |
| [ "$new_domain_name" = "$1" ] && warn=true |
| fi |
| fi |
| if [ -n "$new_domain_search" ]; then |
| if valid_domainname_list $new_domain_search; then |
| conf="${conf}search $new_domain_search$NL" |
| elif ! $warn; then |
| syslog err "Invalid domain name in list:" \ |
| "$new_domain_search" |
| fi |
| fi |
| for x in ${new_domain_name_servers}; do |
| conf="${conf}nameserver $x$NL" |
| done |
| if type resolvconf >/dev/null 2>&1; then |
| [ -n "$ifmetric" ] && export IF_METRIC="$ifmetric" |
| printf %s "$conf" | resolvconf -a "$ifname" |
| return $? |
| fi |
| |
| if [ -e "$resolv_conf_dir/$ifname" ]; then |
| rm -f "$resolv_conf_dir/$ifname" |
| fi |
| [ -d "$resolv_conf_dir" ] || mkdir -p "$resolv_conf_dir" |
| printf %s "$conf" > "$resolv_conf_dir/$ifname" |
| build_resolv_conf |
| } |
| |
| remove_resolv_conf() |
| { |
| if type resolvconf >/dev/null 2>&1; then |
| resolvconf -d "$ifname" -f |
| else |
| if [ -e "$resolv_conf_dir/$ifname" ]; then |
| rm -f "$resolv_conf_dir/$ifname" |
| fi |
| build_resolv_conf |
| fi |
| } |
| |
| # For ease of use, map DHCP6 names onto our DHCP4 names |
| case "$reason" in |
| BOUND6|RENEW6|REBIND6|REBOOT6|INFORM6) |
| new_domain_name_servers="$new_dhcp6_name_servers" |
| new_domain_search="$new_dhcp6_domain_search" |
| ;; |
| esac |
| |
| if $if_up || [ "$reason" = ROUTERADVERT ]; then |
| add_resolv_conf |
| elif $if_down; then |
| remove_resolv_conf |
| fi |