Annotation of embedaddon/dhcp/client/scripts/linux, revision 1.1
1.1 ! misho 1: #!/bin/bash
! 2: # dhclient-script for Linux. Dan Halbert, March, 1997.
! 3: # Updated for Linux 2.[12] by Brian J. Murrell, January 1999.
! 4: # No guarantees about this. I'm a novice at the details of Linux
! 5: # networking.
! 6:
! 7: # Notes:
! 8:
! 9: # 0. This script is based on the netbsd script supplied with dhcp-970306.
! 10:
! 11: # 1. ifconfig down apparently deletes all relevant routes and flushes
! 12: # the arp cache, so this doesn't need to be done explicitly.
! 13:
! 14: # 2. The alias address handling here has not been tested AT ALL.
! 15: # I'm just going by the doc of modern Linux ip aliasing, which uses
! 16: # notations like eth0:0, eth0:1, for each alias.
! 17:
! 18: # 3. I have to calculate the network address, and calculate the broadcast
! 19: # address if it is not supplied. This might be much more easily done
! 20: # by the dhclient C code, and passed on.
! 21:
! 22: # 4. TIMEOUT not tested. ping has a flag I don't know, and I'm suspicious
! 23: # of the $1 in its args.
! 24:
! 25: # 'ip' just looks too weird. /sbin/ip looks less weird.
! 26: ip=/sbin/ip
! 27:
! 28: make_resolv_conf() {
! 29: if [ x"$new_domain_name_servers" != x ]; then
! 30: cat /dev/null > /etc/resolv.conf.dhclient
! 31: chmod 644 /etc/resolv.conf.dhclient
! 32: if [ x"$new_domain_search" != x ]; then
! 33: echo search $new_domain_search >> /etc/resolv.conf.dhclient
! 34: elif [ x"$new_domain_name" != x ]; then
! 35: # Note that the DHCP 'Domain Name Option' is really just a domain
! 36: # name, and that this practice of using the domain name option as
! 37: # a search path is both nonstandard and deprecated.
! 38: echo search $new_domain_name >> /etc/resolv.conf.dhclient
! 39: fi
! 40: for nameserver in $new_domain_name_servers; do
! 41: echo nameserver $nameserver >>/etc/resolv.conf.dhclient
! 42: done
! 43:
! 44: mv /etc/resolv.conf.dhclient /etc/resolv.conf
! 45: elif [ "x${new_dhcp6_name_servers}" != x ] ; then
! 46: cat /dev/null > /etc/resolv.conf.dhclient6
! 47: chmod 644 /etc/resolv.conf.dhclient6
! 48:
! 49: if [ "x${new_dhcp6_domain_search}" != x ] ; then
! 50: echo search ${new_dhcp6_domain_search} >> /etc/resolv.conf.dhclient6
! 51: fi
! 52: shopt -s nocasematch
! 53: for nameserver in ${new_dhcp6_name_servers} ; do
! 54: # If the nameserver has a link-local address
! 55: # add a <zone_id> (interface name) to it.
! 56: if [[ "$nameserver" =~ ^fe80:: ]]
! 57: then
! 58: zone_id="%$interface"
! 59: else
! 60: zone_id=
! 61: fi
! 62: echo nameserver ${nameserver}$zone_id >> /etc/resolv.conf.dhclient6
! 63: done
! 64: shopt -u nocasematch
! 65:
! 66: mv /etc/resolv.conf.dhclient6 /etc/resolv.conf
! 67: fi
! 68: }
! 69:
! 70: # Must be used on exit. Invokes the local dhcp client exit hooks, if any.
! 71: exit_with_hooks() {
! 72: exit_status=$1
! 73: if [ -f /etc/dhclient-exit-hooks ]; then
! 74: . /etc/dhclient-exit-hooks
! 75: fi
! 76: # probably should do something with exit status of the local script
! 77: exit $exit_status
! 78: }
! 79:
! 80: # Invoke the local dhcp client enter hooks, if they exist.
! 81: if [ -f /etc/dhclient-enter-hooks ]; then
! 82: exit_status=0
! 83: . /etc/dhclient-enter-hooks
! 84: # allow the local script to abort processing of this state
! 85: # local script must set exit_status variable to nonzero.
! 86: if [ $exit_status -ne 0 ]; then
! 87: exit $exit_status
! 88: fi
! 89: fi
! 90:
! 91: ###
! 92: ### DHCPv4 Handlers
! 93: ###
! 94:
! 95: if [ x$new_broadcast_address != x ]; then
! 96: new_broadcast_arg="broadcast $new_broadcast_address"
! 97: fi
! 98: if [ x$old_broadcast_address != x ]; then
! 99: old_broadcast_arg="broadcast $old_broadcast_address"
! 100: fi
! 101: if [ x$new_subnet_mask != x ]; then
! 102: new_subnet_arg="netmask $new_subnet_mask"
! 103: fi
! 104: if [ x$old_subnet_mask != x ]; then
! 105: old_subnet_arg="netmask $old_subnet_mask"
! 106: fi
! 107: if [ x$alias_subnet_mask != x ]; then
! 108: alias_subnet_arg="netmask $alias_subnet_mask"
! 109: fi
! 110: if [ x$new_interface_mtu != x ]; then
! 111: mtu_arg="mtu $new_interface_mtu"
! 112: fi
! 113: if [ x$IF_METRIC != x ]; then
! 114: metric_arg="metric $IF_METRIC"
! 115: fi
! 116:
! 117: if [ x$reason = xMEDIUM ]; then
! 118: # Linux doesn't do mediums (ok, ok, media).
! 119: exit_with_hooks 0
! 120: fi
! 121:
! 122: if [ x$reason = xPREINIT ]; then
! 123: if [ x$alias_ip_address != x ]; then
! 124: # Bring down alias interface. Its routes will disappear too.
! 125: ifconfig $interface:0- inet 0
! 126: fi
! 127: ifconfig $interface 0 up
! 128:
! 129: # We need to give the kernel some time to get the interface up.
! 130: sleep 1
! 131:
! 132: exit_with_hooks 0
! 133: fi
! 134:
! 135: if [ x$reason = xARPCHECK ] || [ x$reason = xARPSEND ]; then
! 136: exit_with_hooks 0
! 137: fi
! 138:
! 139: if [ x$reason = xBOUND ] || [ x$reason = xRENEW ] || \
! 140: [ x$reason = xREBIND ] || [ x$reason = xREBOOT ]; then
! 141: current_hostname=`hostname`
! 142: if [ x$current_hostname = x ] || \
! 143: [ x$current_hostname = "x(none)" ] || \
! 144: [ x$current_hostname = xlocalhost ] || \
! 145: [ x$current_hostname = x$old_host_name ]; then
! 146: if [ x$new_host_name != x$old_host_name ]; then
! 147: hostname "$new_host_name"
! 148: fi
! 149: fi
! 150:
! 151: if [ x$old_ip_address != x ] && [ x$alias_ip_address != x ] && \
! 152: [ x$alias_ip_address != x$old_ip_address ]; then
! 153: # Possible new alias. Remove old alias.
! 154: ifconfig $interface:0- inet 0
! 155: fi
! 156: if [ x$old_ip_address != x ] && [ x$old_ip_address != x$new_ip_address ]; then
! 157: # IP address changed. Bringing down the interface will delete all routes,
! 158: # and clear the ARP cache.
! 159: ifconfig $interface inet 0 down
! 160:
! 161: fi
! 162: if [ x$old_ip_address = x ] || [ x$old_ip_address != x$new_ip_address ] || \
! 163: [ x$reason = xBOUND ] || [ x$reason = xREBOOT ]; then
! 164:
! 165: ifconfig $interface inet $new_ip_address $new_subnet_arg \
! 166: $new_broadcast_arg $mtu_arg
! 167: # Add a network route to the computed network address.
! 168: for router in $new_routers; do
! 169: if [ "x$new_subnet_mask" = "x255.255.255.255" ] ; then
! 170: route add -host $router dev $interface
! 171: fi
! 172: route add default gw $router $metric_arg dev $interface
! 173: done
! 174: else
! 175: # we haven't changed the address, have we changed other options
! 176: # that we wish to update?
! 177: if [ x$new_routers != x ] && [ x$new_routers != x$old_routers ] ; then
! 178: # if we've changed routers delete the old and add the new.
! 179: for router in $old_routers; do
! 180: route del default gw $router
! 181: done
! 182: for router in $new_routers; do
! 183: if [ "x$new_subnet_mask" = "x255.255.255.255" ] ; then
! 184: route add -host $router dev $interface
! 185: fi
! 186: route add default gw $router $metric_arg dev $interface
! 187: done
! 188: fi
! 189: fi
! 190: if [ x$new_ip_address != x$alias_ip_address ] && [ x$alias_ip_address != x ];
! 191: then
! 192: ifconfig $interface:0- inet 0
! 193: ifconfig $interface:0 inet $alias_ip_address $alias_subnet_arg
! 194: route add -host $alias_ip_address $interface:0
! 195: fi
! 196: make_resolv_conf
! 197: exit_with_hooks 0
! 198: fi
! 199:
! 200: if [ x$reason = xEXPIRE ] || [ x$reason = xFAIL ] || [ x$reason = xRELEASE ] \
! 201: || [ x$reason = xSTOP ]; then
! 202: if [ x$alias_ip_address != x ]; then
! 203: # Turn off alias interface.
! 204: ifconfig $interface:0- inet 0
! 205: fi
! 206: if [ x$old_ip_address != x ]; then
! 207: # Shut down interface, which will delete routes and clear arp cache.
! 208: ifconfig $interface inet 0 down
! 209: fi
! 210: if [ x$alias_ip_address != x ]; then
! 211: ifconfig $interface:0 inet $alias_ip_address $alias_subnet_arg
! 212: route add -host $alias_ip_address $interface:0
! 213: fi
! 214: exit_with_hooks 0
! 215: fi
! 216:
! 217: if [ x$reason = xTIMEOUT ]; then
! 218: if [ x$alias_ip_address != x ]; then
! 219: ifconfig $interface:0- inet 0
! 220: fi
! 221: ifconfig $interface inet $new_ip_address $new_subnet_arg \
! 222: $new_broadcast_arg $mtu_arg
! 223: set $new_routers
! 224: if ping -q -c 1 $1; then
! 225: if [ x$new_ip_address != x$alias_ip_address ] && \
! 226: [ x$alias_ip_address != x ]; then
! 227: ifconfig $interface:0 inet $alias_ip_address $alias_subnet_arg
! 228: route add -host $alias_ip_address dev $interface:0
! 229: fi
! 230: for router in $new_routers; do
! 231: if [ "x$new_subnet_mask" = "x255.255.255.255" ] ; then
! 232: route add -host $router dev $interface
! 233: fi
! 234: route add default gw $router $metric_arg dev $interface
! 235: done
! 236: make_resolv_conf
! 237: exit_with_hooks 0
! 238: fi
! 239: ifconfig $interface inet 0 down
! 240: exit_with_hooks 1
! 241: fi
! 242:
! 243: ###
! 244: ### DHCPv6 Handlers
! 245: ###
! 246:
! 247: if [ x$reason = xPREINIT6 ] ; then
! 248: # Ensure interface is up.
! 249: ${ip} link set ${interface} up
! 250:
! 251: # Remove any stale addresses from aborted clients.
! 252: ${ip} -f inet6 addr flush dev ${interface} scope global permanent
! 253:
! 254: exit_with_hooks 0
! 255: fi
! 256:
! 257: if [ x${old_ip6_prefix} != x ] || [ x${new_ip6_prefix} != x ] ; then
! 258: echo Prefix ${reason} old=${old_ip6_prefix} new=${new_ip6_prefix}
! 259:
! 260: exit_with_hooks 0
! 261: fi
! 262:
! 263: if [ x$reason = xBOUND6 ] ; then
! 264: if [ x${new_ip6_address} = x ] || [ x${new_ip6_prefixlen} = x ] ; then
! 265: exit_with_hooks 2;
! 266: fi
! 267:
! 268: ${ip} -f inet6 addr add ${new_ip6_address}/${new_ip6_prefixlen} \
! 269: dev ${interface} scope global
! 270:
! 271: # Check for nameserver options.
! 272: make_resolv_conf
! 273:
! 274: exit_with_hooks 0
! 275: fi
! 276:
! 277: if [ x$reason = xRENEW6 ] || [ x$reason = xREBIND6 ] ; then
! 278: if [ x${new_ip6_address} = x ] || [ x${new_ip6_prefixlen} = x ] ; then
! 279: exit_with_hooks 2;
! 280: fi
! 281:
! 282: ${ip} -f inet6 addr add ${new_ip6_address}/${new_ip6_prefixlen} \
! 283: dev ${interface} scope global
! 284:
! 285: # Make sure nothing has moved around on us.
! 286:
! 287: # Nameservers/domains/etc.
! 288: if [ "x${new_dhcp6_name_servers}" != "x${old_dhcp6_name_servers}" ] ||
! 289: [ "x${new_dhcp6_domain_search}" != "x${old_dhcp6_domain_search}" ] ; then
! 290: make_resolv_conf
! 291: fi
! 292:
! 293: exit_with_hooks 0
! 294: fi
! 295:
! 296: if [ x$reason = xDEPREF6 ] ; then
! 297: if [ x${new_ip6_prefixlen} = x ] ; then
! 298: exit_with_hooks 2;
! 299: fi
! 300:
! 301: ${ip} -f inet6 addr change ${new_ip6_address}/${new_ip6_prefixlen} \
! 302: dev ${interface} scope global preferred_lft 0
! 303:
! 304: exit_with_hooks 0
! 305: fi
! 306:
! 307: if [ x$reason = xEXPIRE6 -o x$reason = xRELEASE6 -o x$reason = xSTOP6 ] ; then
! 308: if [ x${old_ip6_address} = x ] || [ x${old_ip6_prefixlen} = x ] ; then
! 309: exit_with_hooks 2;
! 310: fi
! 311:
! 312: ${ip} -f inet6 addr del ${old_ip6_address}/${old_ip6_prefixlen} \
! 313: dev ${interface}
! 314:
! 315: exit_with_hooks 0
! 316: fi
! 317:
! 318: exit_with_hooks 0
FreeBSD-CVSweb <freebsd-cvsweb@FreeBSD.org>
![[BACK]](/icons/cvsweb/back.gif){kind=icon}
Return to linux CVS log ![[TXT]](/icons/cvsweb/text.gif){kind=icon}
![[DIR]](/icons/cvsweb/dir.gif){kind=icon}
Up to [ELWIX - Embedded LightWeight unIX -] / embedaddon / dhcp / client / scripts