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contrib/dhcpcd/hooks/20-resolv.conf
- This file was added.
| # 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="$state_dir/resolv.conf" | |||||
| nocarrier_roaming_dir="$state_dir/roaming" | |||||
| NL=" | |||||
| " | |||||
| : ${resolvconf:=resolvconf} | |||||
| if type "$resolvconf" >/dev/null 2>&1; then | |||||
| have_resolvconf=true | |||||
| else | |||||
| have_resolvconf=false | |||||
| fi | |||||
| build_resolv_conf() | |||||
| { | |||||
| cf="$state_dir/resolv.conf.$ifname" | |||||
| # Build a list of interfaces | |||||
| interfaces=$(list_interfaces "$resolv_conf_dir") | |||||
| # Build the resolv.conf | |||||
| header= | |||||
| 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" | |||||
| } | |||||
| # Extract any ND DNS options from the RA | |||||
| # Obey the lifetimes | |||||
| eval_nd_dns() | |||||
| { | |||||
| eval rdnsstime=\$nd${i}_rdnss${j}_lifetime | |||||
| [ -z "$rdnsstime" ] && return 1 | |||||
| ltime=$(($rdnsstime - $offset)) | |||||
| if [ "$ltime" -gt 0 ]; then | |||||
| eval rdnss=\$nd${i}_rdnss${j}_servers | |||||
| [ -n "$rdnss" ] && new_rdnss="$new_rdnss${new_rdnss:+ }$rdnss" | |||||
| fi | |||||
| eval dnssltime=\$nd${i}_dnssl${j}_lifetime | |||||
| [ -z "$dnssltime" ] && return 1 | |||||
| ltime=$(($dnssltime - $offset)) | |||||
| if [ "$ltime" -gt 0 ]; then | |||||
| eval dnssl=\$nd${i}_dnssl${j}_search | |||||
| [ -n "$dnssl" ] && new_dnssl="$new_dnssl${new_dnssl:+ }$dnssl" | |||||
| fi | |||||
| j=$(($j + 1)) | |||||
| return 0 | |||||
| } | |||||
| add_resolv_conf() | |||||
| { | |||||
| conf="$signature$NL" | |||||
| warn=true | |||||
| # Loop to extract the ND DNS options using our indexed shell values | |||||
| i=1 | |||||
| j=1 | |||||
| while true; do | |||||
| eval acquired=\$nd${i}_acquired | |||||
| [ -z "$acquired" ] && break | |||||
| eval now=\$nd${i}_now | |||||
| [ -z "$now" ] && break | |||||
| offset=$(($now - $acquired)) | |||||
| while true; do | |||||
| eval_nd_dns || break | |||||
| done | |||||
| i=$(($i + 1)) | |||||
| j=1 | |||||
| done | |||||
| [ -n "$new_rdnss" ] && \ | |||||
| new_domain_name_servers="$new_domain_name_servers${new_domain_name_servers:+ }$new_rdnss" | |||||
| [ -n "$new_dnssl" ] && \ | |||||
| new_domain_search="$new_domain_search${new_domain_search:+ }$new_dnssl" | |||||
| # Derive a new domain from our various hostname options | |||||
| if [ -z "$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="${new_host_name#*.}" | |||||
| fi | |||||
| fi | |||||
| # If we don't have any configuration, remove it | |||||
| if [ -z "$new_domain_name_servers" ] && | |||||
| [ -z "$new_domain_name" ] && | |||||
| [ -z "$new_domain_search" ]; then | |||||
| remove_resolv_conf | |||||
| return $? | |||||
| fi | |||||
| if [ -n "$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 | |||||
| new_domain_search=$(uniqify $new_domain_search) | |||||
| 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 | |||||
| new_domain_name_servers=$(uniqify $new_domain_name_servers) | |||||
| for x in ${new_domain_name_servers}; do | |||||
| conf="${conf}nameserver $x$NL" | |||||
| done | |||||
| if $have_resolvconf; then | |||||
| [ -n "$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 $have_resolvconf; then | |||||
| "$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_configured; then | |||||
| if $have_resolvconf && [ "$reason" = NOCARRIER_ROAMING ]; then | |||||
| # avoid calling resolvconf -c on CARRIER unless we roam | |||||
| mkdir -p "$nocarrier_roaming_dir" | |||||
| echo " " >"$nocarrier_roaming_dir/$interface" | |||||
| "$resolvconf" -C "$interface.*" | |||||
| elif $have_resolvconf && [ "$reason" = CARRIER ]; then | |||||
| # Not all resolvconf implementations support -c | |||||
| if [ -e "$nocarrier_roaming_dir/$interface" ]; then | |||||
| rm -f "$nocarrier_roaming_dir/$interface" | |||||
| "$resolvconf" -c "$interface.*" | |||||
| fi | |||||
| elif $if_up || [ "$reason" = ROUTERADVERT ]; then | |||||
| add_resolv_conf | |||||
| elif $if_down; then | |||||
| remove_resolv_conf | |||||
| fi | |||||
| fi | |||||