1 #!/bin/sh 2 3 # 'ip' just looks too weird. /sbin/ip looks less weird. 4 ip=/usr/sbin/ip 5 6 make_resolv_conf() { 7 if [ x"$new_domain_name_servers" != x ]; then 8 cat /dev/null > /etc/resolv.conf.dhclient 9 chmod 644 /etc/resolv.conf.dhclient 10 if [ x"$new_domain_search" != x ]; then 11 echo search $new_domain_search >> /etc/resolv.conf.dhclient 12 elif [ x"$new_domain_name" != x ]; then 13 # Note that the DHCP 'Domain Name Option' is really just a domain 14 # name, and that this practice of using the domain name option as 15 # a search path is both nonstandard and deprecated. 16 echo search $new_domain_name >> /etc/resolv.conf.dhclient 17 fi 18 for nameserver in $new_domain_name_servers; do 19 echo nameserver $nameserver >>/etc/resolv.conf.dhclient 20 done 21 22 mv /etc/resolv.conf.dhclient /etc/resolv.conf 23 elif [ "x${new_dhcp6_name_servers}" != x ] ; then 24 cat /dev/null > /etc/resolv.conf.dhclient6 25 chmod 644 /etc/resolv.conf.dhclient6 26 27 if [ "x${new_dhcp6_domain_search}" != x ] ; then 28 echo search ${new_dhcp6_domain_search} >> /etc/resolv.conf.dhclient6 29 fi 30 for nameserver in ${new_dhcp6_name_servers} ; do 31 # If the nameserver has a link-local address 32 # add a <zone_id> (interface name) to it. 33 case $nameserver in 34 fe80:*) zone_id="%$interface";; 35 FE80:*) zone_id="%$interface";; 36 *) zone_id="";; 37 esac 38 echo nameserver ${nameserver}$zone_id >> /etc/resolv.conf.dhclient6 39 done 40 41 mv /etc/resolv.conf.dhclient6 /etc/resolv.conf 42 fi 43 } 44 45 # Must be used on exit. Invokes the local dhcp client exit hooks, if any. 46 exit_with_hooks() { 47 exit_status=$1 48 if [ -f /etc/dhclient-exit-hooks ]; then 49 . /etc/dhclient-exit-hooks 50 fi 51 # probably should do something with exit status of the local script 52 exit $exit_status 53 } 54 55 # Invoke the local dhcp client enter hooks, if they exist. 56 if [ -f /etc/dhclient-enter-hooks ]; then 57 exit_status=0 58 . /etc/dhclient-enter-hooks 59 # allow the local script to abort processing of this state 60 # local script must set exit_status variable to nonzero. 61 if [ $exit_status -ne 0 ]; then 62 exit $exit_status 63 fi 64 fi 65 66 ### 67 ### DHCPv4 Handlers 68 ### 69 70 if [ x$new_broadcast_address != x ]; then 71 new_broadcast_arg="broadcast $new_broadcast_address" 72 fi 73 if [ x$new_subnet_mask != x ]; then 74 new_subnet_arg="netmask $new_subnet_mask" 75 fi 76 if [ x$alias_subnet_mask != x ]; then 77 alias_subnet_arg="netmask $alias_subnet_mask" 78 fi 79 if [ x$new_interface_mtu != x ]; then 80 mtu_arg="mtu $new_interface_mtu" 81 fi 82 if [ x$IF_METRIC != x ]; then 83 metric_arg="metric $IF_METRIC" 84 fi 85 86 if [ x$reason = xMEDIUM ]; then 87 # Linux doesn't do mediums (ok, ok, media). 88 exit_with_hooks 0 89 fi 90 91 if [ x$reason = xPREINIT ]; then 92 if [ x$alias_ip_address != x ]; then 93 # Bring down alias interface. Its routes will disappear too. 94 ifconfig $interface:0- 0.0.0.0 95 fi 96 ifconfig $interface 0.0.0.0 up 97 98 # We need to give the kernel some time to get the interface up. 99 sleep 1 100 101 exit_with_hooks 0 102 fi 103 104 if [ x$reason = xARPCHECK ] || [ x$reason = xARPSEND ]; then 105 exit_with_hooks 0 106 fi 107 108 if [ x$reason = xBOUND ] || [ x$reason = xRENEW ] || \ 109 [ x$reason = xREBIND ] || [ x$reason = xREBOOT ]; then 110 current_hostname=`hostname` 111 if [ x$current_hostname = x ] || \ 112 [ x$current_hostname = x$old_host_name ]; then 113 if [ x$current_hostname = x ] || \ 114 [ x$new_host_name != x$old_host_name ]; then 115 hostname $new_host_name 116 fi 117 fi 118 119 if [ x$old_ip_address != x ] && [ x$alias_ip_address != x ] && \ 120 [ x$alias_ip_address != x$old_ip_address ]; then 121 # Possible new alias. Remove old alias. 122 ifconfig $interface:0- 0.0.0.0 123 fi 124 if [ x$old_ip_address != x ] && \ 125 [ x$old_ip_address != x$new_ip_address ]; then 126 # IP address changed. Bringing down the interface will delete all routes, 127 # and clear the ARP cache. 128 ifconfig $interface 0.0.0.0 down 129 130 fi 131 if [ x$old_ip_address = x ] || [ x$old_ip_address != x$new_ip_address ] || \ 132 [ x$reason = xBOUND ] || [ x$reason = xREBOOT ]; then 133 134 ifconfig $interface $new_ip_address $new_subnet_arg \ 135 $new_broadcast_arg $mtu_arg 136 for router in $new_routers; do 137 if [ "x$new_subnet_mask" = "x255.255.255.255" ] ; then 138 route add -host $router dev $interface 139 fi 140 route add default gw $router $metric_arg dev $interface 141 done 142 else 143 # we haven't changed the address, have we changed other options 144 # that we wish to update? 145 if [ x$new_routers != x ] && [ x$new_routers != x$old_routers ] ; then 146 # if we've changed routers delete the old and add the new. 147 $LOGGER "New Routers: $new_routers" 148 for router in $old_routers; do 149 route del default gw $router 150 done 151 for router in $new_routers; do 152 if [ "x$new_subnet_mask" = "x255.255.255.255" ] ; then 153 route add -host $router dev $interface 154 fi 155 route add default gw $router $metric_arg dev $interface 156 done 157 fi 158 fi 159 if [ x$new_ip_address != x$alias_ip_address ] && [ x$alias_ip_address != x ]; 160 then 161 ifconfig $interface:0- 0.0.0.0 162 ifconfig $interface:0 $alias_ip_address $alias_subnet_arg 163 route add -host $alias_ip_address $interface:0 164 fi 165 make_resolv_conf 166 exit_with_hooks 0 167 fi 168 169 if [ x$reason = xEXPIRE ] || [ x$reason = xFAIL ] || [ x$reason = xRELEASE ] \ 170 || [ x$reason = xSTOP ]; then 171 if [ x$alias_ip_address != x ]; then 172 # Turn off alias interface. 173 ifconfig $interface:0- 0.0.0.0 174 fi 175 if [ x$old_ip_address != x ]; then 176 # Shut down interface, which will delete routes and clear arp cache. 177 ifconfig $interface 0.0.0.0 down 178 fi 179 if [ x$alias_ip_address != x ]; then 180 ifconfig $interface:0 $alias_ip_address $alias_subnet_arg 181 route add -host $alias_ip_address $interface:0 182 fi 183 exit_with_hooks 0 184 fi 185 186 if [ x$reason = xTIMEOUT ]; then 187 if [ x$alias_ip_address != x ]; then 188 ifconfig $interface:0- 0.0.0.0 189 fi 190 ifconfig $interface $new_ip_address $new_subnet_arg \ 191 $new_broadcast_arg $mtu_arg 192 set $new_routers 193 if ping -q -c 1 $1; then 194 if [ x$new_ip_address != x$alias_ip_address ] && \ 195 [ x$alias_ip_address != x ]; then 196 ifconfig $interface:0 $alias_ip_address $alias_subnet_arg 197 route add -host $alias_ip_address dev $interface:0 198 fi 199 for router in $new_routers; do 200 if [ "x$new_subnet_mask" = "x255.255.255.255" ] ; then 201 route add -host $router dev $interface 202 fi 203 route add default gw $router $metric_arg dev $interface 204 done 205 make_resolv_conf 206 exit_with_hooks 0 207 fi 208 ifconfig $interface 0.0.0.0 down 209 exit_with_hooks 1 210 fi 211 212 ### 213 ### DHCPv6 Handlers 214 ### 215 216 if [ x$reason = xPREINIT6 ]; then 217 # Ensure interface is up. 218 ${ip} link set ${interface} up 219 220 # Remove any stale addresses from aborted clients. 221 ${ip} -f inet6 addr flush dev ${interface} scope global permanent 222 223 exit_with_hooks 0 224 fi 225 226 if [ x${old_ip6_prefix} != x ] || [ x${new_ip6_prefix} != x ] ; then 227 echo Prefix ${reason} old=${old_ip6_prefix} new=${new_ip6_prefix} 228 229 exit_with_hooks 0 230 fi 231 232 if [ x$reason = xBOUND6 ]; then 233 if [ x${new_ip6_address} = x ] || [ x${new_ip6_prefixlen} = x ] ; then 234 exit_with_hooks 2; 235 fi 236 237 ${ip} -f inet6 addr add ${new_ip6_address}/${new_ip6_prefixlen} \ 238 dev ${interface} scope global 239 240 # Check for nameserver options. 241 make_resolv_conf 242 243 exit_with_hooks 0 244 fi 245 246 if [ x$reason = xRENEW6 ] || [ x$reason = xREBIND6 ]; then 247 if [ x${new_ip6_address} != x ] && [ x${new_ip6_prefixlen} != x ] ; then 248 ${ip} -f inet6 addr add ${new_ip6_address}/${new_ip6_prefixlen} \ 249 dev ${interface} scope global 250 fi 251 252 # Make sure nothing has moved around on us. 253 254 # Nameservers/domains/etc. 255 if [ "x${new_dhcp6_name_servers}" != "x${old_dhcp6_name_servers}" ] || 256 [ "x${new_dhcp6_domain_search}" != "x${old_dhcp6_domain_search}" ] ; then 257 make_resolv_conf 258 fi 259 260 exit_with_hooks 0 261 fi 262 263 if [ x$reason = xDEPREF6 ]; then 264 if [ x${new_ip6_prefixlen} = x ] ; then 265 exit_with_hooks 2; 266 fi 267 268 ${ip} -f inet6 addr change ${new_ip6_address}/${new_ip6_prefixlen} \ 269 dev ${interface} scope global preferred_lft 0 270 271 exit_with_hooks 0 272 fi 273 274 if [ x$reason = xEXPIRE6 -o x$reason = xRELEASE6 -o x$reason = xSTOP6 ]; then 275 if [ x${old_ip6_address} = x ] || [ x${old_ip6_prefixlen} = x ] ; then 276 exit_with_hooks 2; 277 fi 278 279 ${ip} -f inet6 addr del ${old_ip6_address}/${old_ip6_prefixlen} \ 280 dev ${interface} 281 282 exit_with_hooks 0 283 fi 284 285 exit_with_hooks 0 286
Indexes created Tue Apr 21 00:23:25 UTC 2026