SOURCES: dhcp-dhclient-script (NEW) - /sbin/dhclient-script from d...

[glen]

Author: glen                         Date: Sun Apr 27 15:09:51 2008 GMT
Module: SOURCES                       Tag: HEAD
---- Log message:
- /sbin/dhclient-script from dhcp-3.1.0a3

---- Files affected:
SOURCES:
   dhcp-dhclient-script (NONE -> 1.1)  (NEW)

---- Diffs:

================================================================
Index: SOURCES/dhcp-dhclient-script
diff -u /dev/null SOURCES/dhcp-dhclient-script:1.1
--- /dev/null	Sun Apr 27 17:09:51 2008
+++ SOURCES/dhcp-dhclient-script	Sun Apr 27 17:09:46 2008
@@ -0,0 +1,224 @@
+#!/bin/bash
+# dhclient-script for Linux. Dan Halbert, March, 1997.
+# Updated for Linux 2.[12] by Brian J. Murrell, January 1999.
+# No guarantees about this. I'm a novice at the details of Linux
+# networking.
+
+# Notes:
+
+# 0. This script is based on the netbsd script supplied with dhcp-970306.
+
+# 1. ifconfig down apparently deletes all relevant routes and flushes
+# the arp cache, so this doesn't need to be done explicitly.
+
+# 2. The alias address handling here has not been tested AT ALL.
+# I'm just going by the doc of modern Linux ip aliasing, which uses
+# notations like eth0:0, eth0:1, for each alias.
+
+# 3. I have to calculate the network address, and calculate the broadcast
+# address if it is not supplied. This might be much more easily done
+# by the dhclient C code, and passed on.
+
+# 4. TIMEOUT not tested. ping has a flag I don't know, and I'm suspicious
+# of the $1 in its args.
+
+if [ -n "${dhc_dbus}" ]; then
+  if [ -x /usr/bin/dbus-send ]; then
+    /usr/bin/dbus-send \
+      --system \
+      --dest=com.redhat.dhcp \
+      --type=method_call \
+      /com/redhat/dhcp/$interface \
+      com.redhat.dhcp.set \
+      'string:'"`env | /bin/egrep -v '^(PATH|SHLVL|_|PWD|dhc_dbus)\='`";
+
+    if (( ( dhc_dbus & 31 ) == 31 )); then
+      exit 0;
+    fi;
+  fi;
+fi;
+
+make_resolv_conf() {
+  if [ x"$new_domain_name_servers" != x ]; then
+    cat /dev/null > /etc/resolv.conf.dhclient
+    chmod 644 /etc/resolv.conf.dhclient
+    if [ x"$new_domain_search" != x ]; then
+      echo search $new_domain_search >> /etc/resolv.conf.dhclient
+    elif [ x"$new_domain_name" != x ]; then
+      # Note that the DHCP 'Domain Name Option' is really just a domain
+      # name, and that this practice of using the domain name option as
+      # a search path is both nonstandard and deprecated.
+      echo search $new_domain_name >> /etc/resolv.conf.dhclient
+    fi
+    for nameserver in $new_domain_name_servers; do
+      echo nameserver $nameserver >>/etc/resolv.conf.dhclient
+    done
+
+    mv /etc/resolv.conf.dhclient /etc/resolv.conf
+  fi
+}
+
+# Must be used on exit.   Invokes the local dhcp client exit hooks, if any.
+exit_with_hooks() {
+  exit_status=$1
+  if [ -f /etc/dhclient-exit-hooks ]; then
+    . /etc/dhclient-exit-hooks
+  fi
+# probably should do something with exit status of the local script
+  exit $exit_status
+}
+
+# Invoke the local dhcp client enter hooks, if they exist.
+if [ -f /etc/dhclient-enter-hooks ]; then
+  exit_status=0
+  . /etc/dhclient-enter-hooks
+  # allow the local script to abort processing of this state
+  # local script must set exit_status variable to nonzero.
+  if [ $exit_status -ne 0 ]; then
+    exit $exit_status
+  fi
+fi
+
+release=`uname -r`
+release=`expr $release : '\(.*\)\..*'`
+relminor=`echo $release |sed -e 's/[0-9]*\.\([0-9][0-9]*\)\(\..*\)*$/\1/'`
+relmajor=`echo $release |sed -e 's/\([0-9][0-9]*\)\..*$/\1/'`
+
+if [ x$new_broadcast_address != x ]; then
+  new_broadcast_arg="broadcast $new_broadcast_address"
+fi
+if [ x$old_broadcast_address != x ]; then
+  old_broadcast_arg="broadcast $old_broadcast_address"
+fi
+if [ x$new_subnet_mask != x ]; then
+  new_subnet_arg="netmask $new_subnet_mask"
+fi
+if [ x$old_subnet_mask != x ]; then
+  old_subnet_arg="netmask $old_subnet_mask"
+fi
+if [ x$alias_subnet_mask != x ]; then
+  alias_subnet_arg="netmask $alias_subnet_mask"
+fi
+
+if [ x$reason = xMEDIUM ]; then
+  # Linux doesn't do mediums (ok, ok, media).
+  exit_with_hooks 0
+fi
+
+if [ x$reason = xPREINIT ]; then
+  if [ x$alias_ip_address != x ]; then
+    # Bring down alias interface. Its routes will disappear too.
+    ifconfig $interface:0- inet 0
+  fi
+  if [ $relmajor -lt 2 ] || ( [ $relmajor -eq 2 ] && [ $relminor -eq 0 ] )
+   then
+    ifconfig $interface inet 0.0.0.0 netmask 0.0.0.0 \
+		broadcast 255.255.255.255 up
+    # Add route to make broadcast work. Do not omit netmask.
+    route add default dev $interface netmask 0.0.0.0
+  else
+    ifconfig $interface 0 up
+  fi
+
+  # We need to give the kernel some time to get the interface up.
+  sleep 1
+
+  exit_with_hooks 0
+fi
+
+if [ x$reason = xARPCHECK ] || [ x$reason = xARPSEND ]; then
+  exit_with_hooks 0
+fi
+  
+if [ x$reason = xBOUND ] || [ x$reason = xRENEW ] || \
+   [ x$reason = xREBIND ] || [ x$reason = xREBOOT ]; then
+  current_hostname=`hostname`
+  if [ x$current_hostname = x ] || \
+     [ x$current_hostname = x$old_host_name ]; then
+    if [ x$current_hostname = x ] || \
+       [ x$new_host_name != x$old_host_name ]; then
+      hostname $new_host_name
+    fi
+  fi
+    
+  if [ x$old_ip_address != x ] && [ x$alias_ip_address != x ] && \
+		[ x$alias_ip_address != x$old_ip_address ]; then
+    # Possible new alias. Remove old alias.
+    ifconfig $interface:0- inet 0
+  fi
+  if [ x$old_ip_address != x ] && [ x$old_ip_address != x$new_ip_address ]; then
+    # IP address changed. Bringing down the interface will delete all routes,
+    # and clear the ARP cache.
+    ifconfig $interface inet 0 down
+
+  fi
+  if [ x$old_ip_address = x ] || [ x$old_ip_address != x$new_ip_address ] || \
+     [ x$reason = xBOUND ] || [ x$reason = xREBOOT ]; then
+
+    ifconfig $interface inet $new_ip_address $new_subnet_arg \
+							$new_broadcast_arg
+    # Add a network route to the computed network address.
+    if [ $relmajor -lt 2 ] || \
+		( [ $relmajor -eq 2 ] && [ $relminor -eq 0 ] ); then
+      route add -net $new_network_number $new_subnet_arg dev $interface
+    fi
+    for router in $new_routers; do
+      route add default gw $router
+    done
+  fi
+  if [ x$new_ip_address != x$alias_ip_address ] && [ x$alias_ip_address != x ];
+   then
+    ifconfig $interface:0- inet 0
+    ifconfig $interface:0 inet $alias_ip_address $alias_subnet_arg
+    route add -host $alias_ip_address $interface:0
+  fi
+  make_resolv_conf
+  exit_with_hooks 0
+fi
+
+if [ x$reason = xEXPIRE ] || [ x$reason = xFAIL ] || [ x$reason = xRELEASE ] \
+   || [ x$reason = xSTOP ]; then
+  if [ x$alias_ip_address != x ]; then
+    # Turn off alias interface.
+    ifconfig $interface:0- inet 0
+  fi
+  if [ x$old_ip_address != x ]; then
+    # Shut down interface, which will delete routes and clear arp cache.
+    ifconfig $interface inet 0 down
+  fi
+  if [ x$alias_ip_address != x ]; then
+    ifconfig $interface:0 inet $alias_ip_address $alias_subnet_arg
+    route add -host $alias_ip_address $interface:0
+  fi
+  exit_with_hooks 0
+fi
+
+if [ x$reason = xTIMEOUT ]; then
+  if [ x$alias_ip_address != x ]; then
+    ifconfig $interface:0- inet 0
+  fi
+  ifconfig $interface inet $new_ip_address $new_subnet_arg \
+					$new_broadcast_arg
+  set $new_routers
+  ############## what is -w in ping?
+  if ping -q -c 1 $1; then
+    if [ x$new_ip_address != x$alias_ip_address ] && \
+			[ x$alias_ip_address != x ]; then
+      ifconfig $interface:0 inet $alias_ip_address $alias_subnet_arg
+      route add -host $alias_ip_address dev $interface:0
+    fi
+    if [ $relmajor -lt 2 ] || \
+		( [ $relmajor -eq 2 ] && [ $relminor -eq 0 ] ); then
+      route add -net $new_network_number
+    fi
+    for router in $new_routers; do
+      route add default gw $router
+    done
+    make_resolv_conf
+    exit_with_hooks 0
+  fi
+  ifconfig $interface inet 0 down
+  exit_with_hooks 1
+fi
+
+exit_with_hooks 0
================================================================