modules.d/35network-legacy/dhclient-script.sh

   1 #!/bin/sh
   2
   3 PATH=/usr/sbin:/usr/bin:/sbin:/bin
   4
   5 type getarg > /dev/null 2>&1 || . /lib/dracut-lib.sh
   6 type ip_to_var > /dev/null 2>&1 || . /lib/net-lib.sh
   7
   8 # We already need a set netif here
   9 netif=$interface
  10
  11 setup_interface() {
  12     ip=$new_ip_address
  13     mtu=$new_interface_mtu
  14     mask=$new_subnet_mask
  15     bcast=$new_broadcast_address
  16     gw=${new_routers%%,*}
  17     domain=$new_domain_name
  18     # get rid of control chars
  19     search=$(printf -- "%s" "$new_domain_search" | tr -d '[:cntrl:]')
  20     namesrv=$new_domain_name_servers
  21     hostname=$new_host_name
  22     [ -n "$new_dhcp_lease_time" ] && lease_time=$new_dhcp_lease_time
  23     [ -n "$new_max_life" ] && lease_time=$new_max_life
  24     preferred_lft=$lease_time
  25     [ -n "$new_preferred_life" ] && preferred_lft=$new_preferred_life
  26
  27     # shellcheck disable=SC1090
  28     [ -f /tmp/net."$netif".override ] && . /tmp/net."$netif".override
  29
  30     # Taken from debian dhclient-script:
  31     # The 576 MTU is only used for X.25 and dialup connections
  32     # where the admin wants low latency.  Such a low MTU can cause
  33     # problems with UDP traffic, among other things.  As such,
  34     # disallow MTUs from 576 and below by default, so that broken
  35     # MTUs are ignored, but higher stuff is allowed (1492, 1500, etc).
  36     if [ -n "$mtu" ] && [ "$mtu" -gt 576 ]; then
  37         if ! ip link set "$netif" mtu "$mtu"; then
  38             ip link set "$netif" down
  39             ip link set "$netif" mtu "$mtu"
  40             linkup "$netif"
  41         fi
  42     fi
  43
  44     ip addr add "$ip"${mask:+/$mask} ${bcast:+broadcast $bcast} dev "$netif" \
  45         ${lease_time:+valid_lft $lease_time} \
  46         ${preferred_lft:+preferred_lft ${preferred_lft}}
  47
  48     if [ -n "$gw" ]; then
  49         if [ "$mask" = "255.255.255.255" ]; then
  50             # point-to-point connection => set explicit route to gateway
  51             echo ip route add "$gw" dev "$netif" > /tmp/net."$netif".gw
  52         fi
  53
  54         echo "$gw" | {
  55             IFS=' ' read -r main_gw other_gw
  56             echo ip route replace default via "$main_gw" dev "$netif" >> /tmp/net."$netif".gw
  57             if [ -n "$other_gw" ]; then
  58                 for g in $other_gw; do
  59                     echo ip route add default via "$g" dev "$netif" >> /tmp/net."$netif".gw
  60                 done
  61             fi
  62         }
  63     fi
  64
  65     if getargbool 1 rd.peerdns; then
  66         [ -n "${search}${domain}" ] && echo "search $search $domain" > /tmp/net."$netif".resolv.conf
  67         if [ -n "$namesrv" ]; then
  68             for s in $namesrv; do
  69                 echo nameserver "$s"
  70             done
  71         fi >> /tmp/net."$netif".resolv.conf
  72     fi
  73     # Note: hostname can be fqdn OR short hostname, so chop off any
  74     # trailing domain name and explicitly add any domain if set.
  75     [ -n "$hostname" ] && echo "echo ${hostname%."$domain"}${domain:+.$domain} > /proc/sys/kernel/hostname" > /tmp/net."$netif".hostname
  76 }
  77
  78 setup_interface6() {
  79     domain=$new_domain_name
  80     # get rid of control chars
  81     search=$(printf -- "%s" "$new_dhcp6_domain_search" | tr -d '[:cntrl:]')
  82     namesrv=$new_dhcp6_name_servers
  83     hostname=$new_host_name
  84     [ -n "$new_dhcp_lease_time" ] && lease_time=$new_dhcp_lease_time
  85     [ -n "$new_max_life" ] && lease_time=$new_max_life
  86     preferred_lft=$lease_time
  87     [ -n "$new_preferred_life" ] && preferred_lft=$new_preferred_life
  88
  89     # shellcheck disable=SC1090
  90     [ -f /tmp/net."$netif".override ] && . /tmp/net."$netif".override
  91
  92     ip -6 addr add "${new_ip6_address}"/"${new_ip6_prefixlen}" \
  93         dev "${netif}" scope global \
  94         ${lease_time:+valid_lft $lease_time} \
  95         ${preferred_lft:+preferred_lft ${preferred_lft}}
  96
  97     if getargbool 1 rd.peerdns; then
  98         [ -n "${search}${domain}" ] && echo "search $search $domain" > /tmp/net."$netif".resolv.conf
  99         if [ -n "$namesrv" ]; then
 100             for s in $namesrv; do
 101                 echo nameserver "$s"
 102             done
 103         fi >> /tmp/net."$netif".resolv.conf
 104     fi
 105
 106     # Note: hostname can be fqdn OR short hostname, so chop off any
 107     # trailing domain name and explicitly add any domain if set.
 108     [ -n "$hostname" ] && echo "echo ${hostname%."$domain"}${domain:+.$domain} > /proc/sys/kernel/hostname" > /tmp/net."$netif".hostname
 109 }
 110
 111 parse_option_121() {
 112     while [ $# -ne 0 ]; do
 113         mask="$1"
 114         shift
 115
 116         # Is the destination a multicast group?
 117         if [ "$1" -ge 224 -a "$1" -lt 240 ]; then
 118             multicast=1
 119         else
 120             multicast=0
 121         fi
 122
 123         # Parse the arguments into a CIDR net/mask string
 124         if [ "$mask" -gt 24 ]; then
 125             destination="$1.$2.$3.$4/$mask"
 126             shift
 127             shift
 128             shift
 129             shift
 130         elif [ "$mask" -gt 16 ]; then
 131             destination="$1.$2.$3.0/$mask"
 132             shift
 133             shift
 134             shift
 135         elif [ "$mask" -gt 8 ]; then
 136             destination="$1.$2.0.0/$mask"
 137             shift
 138             shift
 139         elif [ "$mask" -gt 0 ]; then
 140             destination="$1.0.0.0/$mask"
 141             shift
 142         else
 143             destination="0.0.0.0/$mask"
 144         fi
 145
 146         # Read the gateway
 147         gateway="$1.$2.$3.$4"
 148         shift
 149         shift
 150         shift
 151         shift
 152
 153         # Multicast routing on Linux
 154         #  - If you set a next-hop address for a multicast group, this breaks with Cisco switches
 155         #  - If you simply leave it link-local and attach it to an interface, it works fine.
 156         if [ $multicast -eq 1 -o "$gateway" = "0.0.0.0" ]; then
 157             temp_result="$destination dev $interface"
 158         else
 159             temp_result="$destination via $gateway dev $interface"
 160         fi
 161
 162         echo "/sbin/ip route replace $temp_result"
 163     done
 164 }
 165
 166 case $reason in
 167     PREINIT)
 168         echo "dhcp: PREINIT $netif up"
 169         linkup "$netif"
 170         ;;
 171
 172     PREINIT6)
 173         echo "dhcp: PREINIT6 $netif up"
 174         linkup "$netif"
 175         wait_for_ipv6_dad_link "$netif"
 176         ;;
 177
 178     BOUND)
 179         echo "dhcp: BOUND setting up $netif"
 180         unset layer2
 181         if [ -f /sys/class/net/"$netif"/device/layer2 ]; then
 182             read -r layer2 < /sys/class/net/"$netif"/device/layer2
 183         fi
 184         if [ "$layer2" != "0" ]; then
 185             if command -v arping2 > /dev/null; then
 186                 if arping2 -q -C 1 -c 2 -I "$netif" -0 "$new_ip_address"; then
 187                     warn "Duplicate address detected for $new_ip_address while doing dhcp. retrying"
 188                     exit 1
 189                 fi
 190             else
 191                 if ! arping -f -q -D -c 2 -I "$netif" "$new_ip_address"; then
 192                     warn "Duplicate address detected for $new_ip_address while doing dhcp. retrying"
 193                     exit 1
 194                 fi
 195             fi
 196         fi
 197         unset layer2
 198         setup_interface
 199         set | while read -r line || [ -n "$line" ]; do
 200             [ "${line#new_}" = "$line" ] && continue
 201             echo "$line"
 202         done > /tmp/dhclient."$netif".dhcpopts
 203
 204         {
 205             echo '. /lib/net-lib.sh'
 206             echo "setup_net $netif"
 207             if [ -n "$new_classless_static_routes" ]; then
 208                 OLDIFS="$IFS"
 209                 IFS=".$IFS"
 210                 parse_option_121 "$new_classless_static_routes"
 211                 IFS="$OLDIFS"
 212             fi
 213             echo "source_hook initqueue/online $netif"
 214             [ -e /tmp/net."$netif".manualup ] || echo "/sbin/netroot $netif"
 215             echo "rm -f -- $hookdir/initqueue/setup_net_$netif.sh"
 216         } > "$hookdir"/initqueue/setup_net_"$netif".sh
 217
 218         echo "[ -f /tmp/net.$netif.did-setup ]" > "$hookdir"/initqueue/finished/dhclient-"$netif".sh
 219         : > /tmp/net."$netif".up
 220         if [ -e /sys/class/net/"${netif}"/address ]; then
 221             : > "/tmp/net.$(cat /sys/class/net/"${netif}"/address).up"
 222         fi
 223
 224         ;;
 225
 226     RENEW | REBIND)
 227         unset lease_time
 228         [ -n "$new_dhcp_lease_time" ] && lease_time=$new_dhcp_lease_time
 229         [ -n "$new_max_life" ] && lease_time=$new_max_life
 230         preferred_lft=$lease_time
 231         [ -n "$new_preferred_life" ] && preferred_lft=$new_preferred_life
 232         ip -4 addr change "${new_ip_address}"/"${new_subnet_mask}" broadcast "${new_broadcast_address}" dev "${interface}" \
 233             ${lease_time:+valid_lft $lease_time} ${preferred_lft:+preferred_lft ${preferred_lft}} \
 234             > /dev/null 2>&1
 235         ;;
 236
 237     BOUND6)
 238         echo "dhcp: BOUND6 setting up $netif"
 239         setup_interface6
 240
 241         set | while read -r line || [ -n "$line" ]; do
 242             [ "${line#new_}" = "$line" ] && continue
 243             echo "$line"
 244         done > /tmp/dhclient."$netif".dhcpopts
 245
 246         {
 247             echo '. /lib/net-lib.sh'
 248             echo "setup_net $netif"
 249             echo "source_hook initqueue/online $netif"
 250             [ -e /tmp/net."$netif".manualup ] || echo "/sbin/netroot $netif"
 251             echo "rm -f -- $hookdir/initqueue/setup_net_$netif.sh"
 252         } > "$hookdir"/initqueue/setup_net_"$netif".sh
 253
 254         echo "[ -f /tmp/net.$netif.did-setup ]" > "$hookdir"/initqueue/finished/dhclient-"$netif".sh
 255         : > /tmp/net."$netif".up
 256         if [ -e /sys/class/net/"${netif}"/address ]; then
 257             : > "/tmp/net.$(cat /sys/class/net/"${netif}"/address).up"
 258         fi
 259         ;;
 260
 261     RENEW6 | REBIND6)
 262         unset lease_time
 263         [ -n "$new_dhcp_lease_time" ] && lease_time=$new_dhcp_lease_time
 264         [ -n "$new_max_life" ] && lease_time=$new_max_life
 265         preferred_lft=$lease_time
 266         [ -n "$new_preferred_life" ] && preferred_lft=$new_preferred_life
 267         ip -6 addr change "${new_ip6_address}"/"${new_ip6_prefixlen}" dev "${interface}" scope global \
 268             ${lease_time:+valid_lft $lease_time} ${preferred_lft:+preferred_lft ${preferred_lft}} \
 269             > /dev/null 2>&1
 270         ;;
 271
 272     *) echo "dhcp: $reason" ;;
 273 esac
 274
 275 exit 0