dhclient-script (7921B)
1 #!/bin/sh 2 3 make_resolv_conf() { 4 if [ x"$new_domain_name_servers" != x ]; then 5 cat /dev/null > /etc/resolv.conf.dhclient 6 chmod 644 /etc/resolv.conf.dhclient 7 if [ x"$new_domain_search" != x ]; then 8 echo search $new_domain_search >> /etc/resolv.conf.dhclient 9 elif [ x"$new_domain_name" != x ]; then 10 # Note that the DHCP 'Domain Name Option' is really just a domain 11 # name, and that this practice of using the domain name option as 12 # a search path is both nonstandard and deprecated. 13 echo search $new_domain_name >> /etc/resolv.conf.dhclient 14 fi 15 for nameserver in $new_domain_name_servers; do 16 echo nameserver $nameserver >>/etc/resolv.conf.dhclient 17 done 18 19 elif [ "x${new_dhcp6_name_servers}" != x ] ; then 20 cat /dev/null > /etc/resolv.conf.dhclient6 21 chmod 644 /etc/resolv.conf.dhclient6 22 23 if [ "x${new_dhcp6_domain_search}" != x ] ; then 24 echo search ${new_dhcp6_domain_search} >> /etc/resolv.conf.dhclient6 25 fi 26 for nameserver in ${new_dhcp6_name_servers} ; do 27 echo nameserver ${nameserver} >> /etc/resolv.conf.dhclient6 28 done 29 fi 30 31 # if both v4 and v6 clients are running, concatenate results 32 cat /etc/resolv.conf.* > /etc/resolv.conf 33 } 34 35 # Must be used on exit. Invokes the local dhcp client exit hooks, if any. 36 exit_with_hooks() { 37 exit_status=$1 38 if [ -f /etc/dhclient-exit-hooks ]; then 39 . /etc/dhclient-exit-hooks 40 fi 41 # probably should do something with exit status of the local script 42 exit $exit_status 43 } 44 45 # Invoke the local dhcp client enter hooks, if they exist. 46 if [ -f /etc/dhclient-enter-hooks ]; then 47 exit_status=0 48 . /etc/dhclient-enter-hooks 49 # allow the local script to abort processing of this state 50 # local script must set exit_status variable to nonzero. 51 if [ $exit_status -ne 0 ]; then 52 exit $exit_status 53 fi 54 fi 55 56 ### 57 ### DHCPv4 Handlers 58 ### 59 60 if [ x$new_broadcast_address != x ]; then 61 new_broadcast_arg="broadcast $new_broadcast_address" 62 fi 63 if [ x$new_subnet_mask != x ]; then 64 new_subnet_arg="netmask $new_subnet_mask" 65 fi 66 if [ x$alias_subnet_mask != x ]; then 67 alias_subnet_arg="netmask $alias_subnet_mask" 68 fi 69 70 if [ x$reason = xMEDIUM ]; then 71 # Linux doesn't do mediums (ok, ok, media). 72 exit_with_hooks 0 73 fi 74 75 if [ x$reason = xPREINIT ]; then 76 if [ x$alias_ip_address != x ]; then 77 # Bring down alias interface. Its routes will disappear too. 78 ifconfig $interface:0- 0.0.0.0 79 fi 80 ifconfig $interface 0.0.0.0 up 81 82 # We need to give the kernel some time to get the interface up. 83 sleep 1 84 85 exit_with_hooks 0 86 fi 87 88 if [ x$reason = xARPCHECK ] || [ x$reason = xARPSEND ]; then 89 exit_with_hooks 0 90 fi 91 92 if [ x$reason = xBOUND ] || [ x$reason = xRENEW ] || \ 93 [ x$reason = xREBIND ] || [ x$reason = xREBOOT ]; then 94 current_hostname=`hostname` 95 if [ x$current_hostname = x ] || \ 96 [ x$current_hostname = x$old_host_name ]; then 97 if [ x$current_hostname = x ] || \ 98 [ x$new_host_name != x$old_host_name ]; then 99 hostname $new_host_name 100 fi 101 fi 102 103 if [ x$old_ip_address != x ] && [ x$alias_ip_address != x ] && \ 104 [ x$alias_ip_address != x$old_ip_address ]; then 105 # Possible new alias. Remove old alias. 106 ifconfig $interface:0- 0.0.0.0 107 fi 108 if [ x$old_ip_address != x ] && [ x$old_ip_address != x$new_ip_address ]; then 109 # IP address changed. Bringing down the interface will delete all routes, 110 # and clear the ARP cache. 111 ifconfig $interface 0.0.0.0 down 112 113 fi 114 if [ x$old_ip_address = x ] || [ x$old_ip_address != x$new_ip_address ] || \ 115 [ x$reason = xBOUND ] || [ x$reason = xREBOOT ]; then 116 117 ifconfig $interface $new_ip_address $new_subnet_arg \ 118 $new_broadcast_arg 119 for router in $new_routers; do 120 if [ "x$new_subnet_mask" = "x255.255.255.255" ] ; then 121 route add -host $router dev $interface 122 fi 123 route add default gw $router 124 done 125 fi 126 if [ x$new_ip_address != x$alias_ip_address ] && [ x$alias_ip_address != x ]; 127 then 128 ifconfig $interface:0- 0.0.0.0 129 ifconfig $interface:0 $alias_ip_address $alias_subnet_arg 130 route add -host $alias_ip_address $interface:0 131 fi 132 make_resolv_conf 133 exit_with_hooks 0 134 fi 135 136 if [ x$reason = xEXPIRE ] || [ x$reason = xFAIL ] || [ x$reason = xRELEASE ] \ 137 || [ x$reason = xSTOP ]; then 138 if [ x$alias_ip_address != x ]; then 139 # Turn off alias interface. 140 ifconfig $interface:0- 0.0.0.0 141 fi 142 if [ x$old_ip_address != x ]; then 143 # Shut down interface, which will delete routes and clear arp cache. 144 ifconfig $interface 0.0.0.0 down 145 fi 146 if [ x$alias_ip_address != x ]; then 147 ifconfig $interface:0 $alias_ip_address $alias_subnet_arg 148 route add -host $alias_ip_address $interface:0 149 fi 150 151 # remove v4 dns configuration for this interface 152 rm /etc/resolv.conf.dhclient 153 cat /etc/resolv.conf.* > /etc/resolv.conf 154 155 exit_with_hooks 0 156 fi 157 158 if [ x$reason = xTIMEOUT ]; then 159 if [ x$alias_ip_address != x ]; then 160 ifconfig $interface:0- 0.0.0.0 161 fi 162 ifconfig $interface $new_ip_address $new_subnet_arg \ 163 $new_broadcast_arg 164 set $new_routers 165 if ping -q -c 1 $1; then 166 if [ x$new_ip_address != x$alias_ip_address ] && \ 167 [ x$alias_ip_address != x ]; then 168 ifconfig $interface:0 $alias_ip_address $alias_subnet_arg 169 route add -host $alias_ip_address dev $interface:0 170 fi 171 for router in $new_routers; do 172 if [ "x$new_subnet_mask" = "x255.255.255.255" ] ; then 173 route add -host $router dev $interface 174 fi 175 route add default gw $router 176 done 177 make_resolv_conf 178 exit_with_hooks 0 179 fi 180 ifconfig $interface 0.0.0.0 down 181 exit_with_hooks 1 182 fi 183 184 ### 185 ### DHCPv6 Handlers 186 ### 187 188 if [ x$reason = xPREINIT6 ]; then 189 # Ensure interface is up. 190 ifconfig ${interface} up 191 192 # Remove any stale addresses from aborted clients. 193 ip -f inet6 addr flush dev ${interface} scope global 194 195 exit_with_hooks 0 196 fi 197 198 if [ x${old_ip6_prefix} != x ] || [ x${new_ip6_prefix} != x ] ; then 199 echo Prefix ${reason} old=${old_ip6_prefix} new=${new_ip6_prefix} 200 201 exit_with_hooks 0 202 fi 203 204 if [ x$reason = xBOUND6 ]; then 205 if [ x${new_ip6_address} = x ] || [ x${new_ip6_prefixlen} = x ] ; then 206 exit_with_hooks 2; 207 fi 208 209 ifconfig ${interface} add ${new_ip6_address}/${new_ip6_prefixlen} 210 211 # Check for nameserver options. 212 make_resolv_conf 213 214 ### << 215 # Set up softwire tunnel 216 if [ x${new_dhcp6_softwire} != x ] ; then 217 /etc/init.d/dhclient stop 218 ifconfig ${interface} 0.0.0.0 219 ip -6 tunnel add tun0 mode ipip6 \ 220 remote ${new_dhcp6_softwire} \ 221 local ${new_ip6_address} \ 222 dev ${interface} encaplimit none 223 ip link set tun0 up 224 ip route add default dev tun0 225 fi 226 ### >> 227 228 exit_with_hooks 0 229 fi 230 231 if [ x$reason = xRENEW6 ] || [ x$reason = xREBIND6 ]; then 232 if [ x${new_ip6_address} = x ] || [ x${new_ip6_prefixlen} = x ] ; then 233 exit_with_hooks 2; 234 fi 235 236 ifconfig ${interface} add ${new_ip6_address}/${new_ip6_prefixlen} 237 238 # Make sure nothing has moved around on us. 239 240 # Nameservers/domains/etc. 241 if [ "x${new_dhcp6_name_servers}" != "x${old_dhcp6_name_servers}" ] || 242 [ "x${new_dhcp6_domain_search}" != "x${old_dhcp6_domain_search}" ] ; then 243 make_resolv_conf 244 fi 245 246 exit_with_hooks 0 247 fi 248 249 if [ x$reason = xDEPREF6 ]; then 250 if [ x${new_ip6_address} = x ] ; then 251 exit_with_hooks 2; 252 fi 253 254 # Busybox ifconfig has no way to communicate this to the kernel, so ignore it 255 256 exit_with_hooks 0 257 fi 258 259 if [ x$reason = xEXPIRE6 -o x$reason = xRELEASE6 -o x$reason = xSTOP6 ]; then 260 if [ x${old_ip6_address} = x ] || [ x${old_ip6_prefixlen} = x ] ; then 261 exit_with_hooks 2; 262 fi 263 264 ifconfig ${interface} del ${old_ip6_address}/${old_ip6_prefixlen} 265 266 # remove v6 dns configuration for this interface 267 rm /etc/resolv.conf.dhclient6 268 cat /etc/resolv.conf.* > /etc/resolv.conf 269 270 ### << 271 # Tear down softwire tunnel 272 if [ x${old_dhcp6_softwire} != x ] ; then 273 ip link set tun0 down 274 ip tunnel del tun0 275 fi 276 ### >> 277 278 exit_with_hooks 0 279 fi 280 281 exit_with_hooks 0