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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="$state_dir/resolv.conf"
NL="
"
build_resolv_conf()
{
local cf="$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=
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
new_domain_name="$1"
if valid_domainname "$new_domain_name"; then
conf="${conf}domain $new_domain_name$NL"
else
syslog err "Invalid domain name: $new_domain_name"
fi
# Support RFC violating search in domain
if [ -z "$new_domain_search" -a -n "$2" ]; then
new_domain_search="$*"
fi
fi
if [ -n "$new_domain_search" -a \
"$new_domain_search" != "$new_domain_name" ]
then
if valid_domainname_list $new_domain_search; then
conf="${conf}search $new_domain_search$NL"
else
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
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