diff options
Diffstat (limited to 'modules.d/35network-legacy/dhclient-script.sh')
| -rwxr-xr-x | modules.d/35network-legacy/dhclient-script.sh | 275 |
1 files changed, 275 insertions, 0 deletions
diff --git a/modules.d/35network-legacy/dhclient-script.sh b/modules.d/35network-legacy/dhclient-script.sh new file mode 100755 index 0000000..b3e5e75 --- /dev/null +++ b/modules.d/35network-legacy/dhclient-script.sh @@ -0,0 +1,275 @@ +#!/bin/sh + +PATH=/usr/sbin:/usr/bin:/sbin:/bin + +type getarg > /dev/null 2>&1 || . /lib/dracut-lib.sh +type ip_to_var > /dev/null 2>&1 || . /lib/net-lib.sh + +# We already need a set netif here +netif=$interface + +setup_interface() { + ip=$new_ip_address + mtu=$new_interface_mtu + mask=$new_subnet_mask + bcast=$new_broadcast_address + gw=${new_routers%%,*} + domain=$new_domain_name + # get rid of control chars + search=$(printf -- "%s" "$new_domain_search" | tr -d '[:cntrl:]') + namesrv=$new_domain_name_servers + hostname=$new_host_name + [ -n "$new_dhcp_lease_time" ] && lease_time=$new_dhcp_lease_time + [ -n "$new_max_life" ] && lease_time=$new_max_life + preferred_lft=$lease_time + [ -n "$new_preferred_life" ] && preferred_lft=$new_preferred_life + + # shellcheck disable=SC1090 + [ -f /tmp/net."$netif".override ] && . /tmp/net."$netif".override + + # Taken from debian dhclient-script: + # The 576 MTU is only used for X.25 and dialup connections + # where the admin wants low latency. Such a low MTU can cause + # problems with UDP traffic, among other things. As such, + # disallow MTUs from 576 and below by default, so that broken + # MTUs are ignored, but higher stuff is allowed (1492, 1500, etc). + if [ -n "$mtu" ] && [ "$mtu" -gt 576 ]; then + if ! ip link set "$netif" mtu "$mtu"; then + ip link set "$netif" down + ip link set "$netif" mtu "$mtu" + linkup "$netif" + fi + fi + + ip addr add "$ip"${mask:+/$mask} ${bcast:+broadcast $bcast} dev "$netif" \ + ${lease_time:+valid_lft $lease_time} \ + ${preferred_lft:+preferred_lft ${preferred_lft}} + + if [ -n "$gw" ]; then + if [ "$mask" = "255.255.255.255" ]; then + # point-to-point connection => set explicit route to gateway + echo ip route add "$gw" dev "$netif" > /tmp/net."$netif".gw + fi + + echo "$gw" | { + IFS=' ' read -r main_gw other_gw + echo ip route replace default via "$main_gw" dev "$netif" >> /tmp/net."$netif".gw + if [ -n "$other_gw" ]; then + for g in $other_gw; do + echo ip route add default via "$g" dev "$netif" >> /tmp/net."$netif".gw + done + fi + } + fi + + if getargbool 1 rd.peerdns; then + [ -n "${search}${domain}" ] && echo "search $search $domain" > /tmp/net."$netif".resolv.conf + if [ -n "$namesrv" ]; then + for s in $namesrv; do + echo nameserver "$s" + done + fi >> /tmp/net."$netif".resolv.conf + fi + # Note: hostname can be fqdn OR short hostname, so chop off any + # trailing domain name and explicitly add any domain if set. + [ -n "$hostname" ] && echo "echo ${hostname%."$domain"}${domain:+.$domain} > /proc/sys/kernel/hostname" > /tmp/net."$netif".hostname +} + +setup_interface6() { + domain=$new_domain_name + # get rid of control chars + search=$(printf -- "%s" "$new_dhcp6_domain_search" | tr -d '[:cntrl:]') + namesrv=$new_dhcp6_name_servers + hostname=$new_host_name + [ -n "$new_dhcp_lease_time" ] && lease_time=$new_dhcp_lease_time + [ -n "$new_max_life" ] && lease_time=$new_max_life + preferred_lft=$lease_time + [ -n "$new_preferred_life" ] && preferred_lft=$new_preferred_life + + # shellcheck disable=SC1090 + [ -f /tmp/net."$netif".override ] && . /tmp/net."$netif".override + + ip -6 addr add "${new_ip6_address}"/"${new_ip6_prefixlen}" \ + dev "${netif}" scope global \ + ${lease_time:+valid_lft $lease_time} \ + ${preferred_lft:+preferred_lft ${preferred_lft}} + + if getargbool 1 rd.peerdns; then + [ -n "${search}${domain}" ] && echo "search $search $domain" > /tmp/net."$netif".resolv.conf + if [ -n "$namesrv" ]; then + for s in $namesrv; do + echo nameserver "$s" + done + fi >> /tmp/net."$netif".resolv.conf + fi + + # Note: hostname can be fqdn OR short hostname, so chop off any + # trailing domain name and explicitly add any domain if set. + [ -n "$hostname" ] && echo "echo ${hostname%."$domain"}${domain:+.$domain} > /proc/sys/kernel/hostname" > /tmp/net."$netif".hostname +} + +parse_option_121() { + while [ $# -ne 0 ]; do + mask="$1" + shift + + # Is the destination a multicast group? + if [ "$1" -ge 224 -a "$1" -lt 240 ]; then + multicast=1 + else + multicast=0 + fi + + # Parse the arguments into a CIDR net/mask string + if [ "$mask" -gt 24 ]; then + destination="$1.$2.$3.$4/$mask" + shift + shift + shift + shift + elif [ "$mask" -gt 16 ]; then + destination="$1.$2.$3.0/$mask" + shift + shift + shift + elif [ "$mask" -gt 8 ]; then + destination="$1.$2.0.0/$mask" + shift + shift + elif [ "$mask" -gt 0 ]; then + destination="$1.0.0.0/$mask" + shift + else + destination="0.0.0.0/$mask" + fi + + # Read the gateway + gateway="$1.$2.$3.$4" + shift + shift + shift + shift + + # Multicast routing on Linux + # - If you set a next-hop address for a multicast group, this breaks with Cisco switches + # - If you simply leave it link-local and attach it to an interface, it works fine. + if [ $multicast -eq 1 -o "$gateway" = "0.0.0.0" ]; then + temp_result="$destination dev $interface" + else + temp_result="$destination via $gateway dev $interface" + fi + + echo "/sbin/ip route replace $temp_result" + done +} + +case $reason in + PREINIT) + echo "dhcp: PREINIT $netif up" + linkup "$netif" + ;; + + PREINIT6) + echo "dhcp: PREINIT6 $netif up" + linkup "$netif" + wait_for_ipv6_dad_link "$netif" + ;; + + BOUND) + echo "dhcp: BOUND setting up $netif" + unset layer2 + if [ -f /sys/class/net/"$netif"/device/layer2 ]; then + read -r layer2 < /sys/class/net/"$netif"/device/layer2 + fi + if [ "$layer2" != "0" ]; then + if command -v arping2 > /dev/null; then + if arping2 -q -C 1 -c 2 -I "$netif" -0 "$new_ip_address"; then + warn "Duplicate address detected for $new_ip_address while doing dhcp. retrying" + exit 1 + fi + else + if ! arping -f -q -D -c 2 -I "$netif" "$new_ip_address"; then + warn "Duplicate address detected for $new_ip_address while doing dhcp. retrying" + exit 1 + fi + fi + fi + unset layer2 + setup_interface + set | while read -r line || [ -n "$line" ]; do + [ "${line#new_}" = "$line" ] && continue + echo "$line" + done > /tmp/dhclient."$netif".dhcpopts + + { + echo '. /lib/net-lib.sh' + echo "setup_net $netif" + if [ -n "$new_classless_static_routes" ]; then + OLDIFS="$IFS" + IFS=".$IFS" + parse_option_121 "$new_classless_static_routes" + IFS="$OLDIFS" + fi + echo "source_hook initqueue/online $netif" + [ -e /tmp/net."$netif".manualup ] || echo "/sbin/netroot $netif" + echo "rm -f -- $hookdir/initqueue/setup_net_$netif.sh" + } > "$hookdir"/initqueue/setup_net_"$netif".sh + + echo "[ -f /tmp/net.$netif.did-setup ]" > "$hookdir"/initqueue/finished/dhclient-"$netif".sh + : > /tmp/net."$netif".up + if [ -e /sys/class/net/"${netif}"/address ]; then + : > "/tmp/net.$(cat /sys/class/net/"${netif}"/address).up" + fi + + ;; + + RENEW | REBIND) + unset lease_time + [ -n "$new_dhcp_lease_time" ] && lease_time=$new_dhcp_lease_time + [ -n "$new_max_life" ] && lease_time=$new_max_life + preferred_lft=$lease_time + [ -n "$new_preferred_life" ] && preferred_lft=$new_preferred_life + ip -4 addr change "${new_ip_address}"/"${new_subnet_mask}" broadcast "${new_broadcast_address}" dev "${interface}" \ + ${lease_time:+valid_lft $lease_time} ${preferred_lft:+preferred_lft ${preferred_lft}} \ + > /dev/null 2>&1 + ;; + + BOUND6) + echo "dhcp: BOUND6 setting up $netif" + setup_interface6 + + set | while read -r line || [ -n "$line" ]; do + [ "${line#new_}" = "$line" ] && continue + echo "$line" + done > /tmp/dhclient."$netif".dhcpopts + + { + echo '. /lib/net-lib.sh' + echo "setup_net $netif" + echo "source_hook initqueue/online $netif" + [ -e /tmp/net."$netif".manualup ] || echo "/sbin/netroot $netif" + echo "rm -f -- $hookdir/initqueue/setup_net_$netif.sh" + } > "$hookdir"/initqueue/setup_net_"$netif".sh + + echo "[ -f /tmp/net.$netif.did-setup ]" > "$hookdir"/initqueue/finished/dhclient-"$netif".sh + : > /tmp/net."$netif".up + if [ -e /sys/class/net/"${netif}"/address ]; then + : > "/tmp/net.$(cat /sys/class/net/"${netif}"/address).up" + fi + ;; + + RENEW6 | REBIND6) + unset lease_time + [ -n "$new_dhcp_lease_time" ] && lease_time=$new_dhcp_lease_time + [ -n "$new_max_life" ] && lease_time=$new_max_life + preferred_lft=$lease_time + [ -n "$new_preferred_life" ] && preferred_lft=$new_preferred_life + ip -6 addr change "${new_ip6_address}"/"${new_ip6_prefixlen}" dev "${interface}" scope global \ + ${lease_time:+valid_lft $lease_time} ${preferred_lft:+preferred_lft ${preferred_lft}} \ + > /dev/null 2>&1 + ;; + + *) echo "dhcp: $reason" ;; +esac + +exit 0 |