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List: dhcp-client
Subject: RE: dhclient dependencies
From: "Jordi Haarman" <J.Haarman () cable ! a2000 ! nl>
Date: 2000-01-24 16:51:13
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ok the "dhclient ethX > file 2>&1" worked! thx.
You rule! I'm getting a ip from the server now but still a lot of error
messages. Maybe it is easy solved:
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/etc/dhclient-script: uname: command not found
/etc/dhclient-script: expr: command not found
/etc/dhclient-script: sed: command not found
/etc/dhclient-script: sed: command not found
/etc/dhclient-script: [: -lt: unary operator expected
/etc/dhclient-script: [: -eq: unary operator expected
Listening on LPF/eth0/00:10:5a:48:10:14
Sending on LPF/eth0/00:10:5a:48:10:14
Sending on Socket/fallback/fallback-net
DHCPREQUEST on eth0 to 255.255.255.255 port 67
DHCPACK from 192.168.100.200
/etc/dhclient-script: uname: command not found
/etc/dhclient-script: expr: command not found
/etc/dhclient-script: sed: command not found
/etc/dhclient-script: sed: command not found
/etc/dhclient-script: hostname: command not found
/etc/dhclient-script: [: -lt: unary operator expected
/etc/dhclient-script: [: -eq: unary operator expected
SIOCADDRT: File exists
bound to 192.168.100.157 -- renewal in 18000 seconds.
> -----Original Message-----
> From: Ted Lemon [mailto:mellon@isc.org]
> Sent: maandag 24 januari 2000 17:16
> To: Jordi Haarman
> Cc: Dhcp-Client
> Subject: Re: dhclient dependencies
>
>
>
> > Is the scripting easy done? (I'm not that good in linux)
>
> Sigh. Why are you trying to do magic, then? You will probably
> *get* good in the process! :')
>
> > How can I get the dhclient output to a file? dhclient ethX >
> file doesn't
> > seem to work.
>
> Try "dhclient ethX >& file", or if you get an error message when you
> do that, try "dhclient ethX > file 2>&1". Unix has two output
> descriptors - stdout (1) and stderr (2). Dhclient logs most of its
> output to stderr, rather than stdout, which is why "dhclient ethX
> >file" doesn't work - ">" redirects only stdout. In the bourne shell
> (and probably bash) you can redirect stderr to stdout with "2>&1".
> In the C shell, you can redirect stdout and stderr to a file with
> ">&".
>
> To fix the script, you need to understand Bourne shell programming.
> It sounds like you don't, so I've included a modified script below
> that may work for you. I haven't tested it, so I make no
> promises...
>
> I'd suggest getting a book on bourne shell programming or bash
> programming if you want to do much with Linux - you won't regret it.
> O'Reilly probably has what you need.
>
> _MelloN_
>
> #!/bin/sh
> # 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.
>
> # Invoke the local dhcp client enter hooks, if they exist.
> if [ -x /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 : '\(.*\)\..*'`
> relmajor=`echo $release |sed -e 's/^\([^\.]*\)\..*$/\1/'`
> relminor=`echo $release |sed -e 's/^.*\.\([^\.]*\)$/\1/'`
>
> if [ x$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_status=0
> if [ -x /etc/dhclient-exit-hooks ]; then
> . /etc/dhclient-exit-hooks
> fi
> # probably should do something with exit status of the local script
> exit $exit_status
> fi
>
> if [ x$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 up
> fi
>
> # We need to give the kernel some time to get the interface up.
> sleep 1
>
> exit_status=0
> if [ -x /etc/dhclient-exit-hooks ]; then
> . /etc/dhclient-exit-hooks
> fi
> # probably should do something with exit status of the local script
> exit $exit_status
> fi
>
> if [ x$reason = xARPCHECK ] || [ x$reason = xARPSEND ]; then
> exit_status=0
> if [ -x /etc/dhclient-exit-hooks ]; then
> . /etc/dhclient-exit-hooks
> fi
> # probably should do something with exit status of the local script
> exit $exit_status
> fi
>
> if [ x$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$new_host_name != x$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 $interface inet down
>
> fi
> if [ x$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
> echo search $new_domain_name >/etc/resolv.conf
> for nameserver in $new_domain_name_servers; do
> echo nameserver $nameserver >>/etc/resolv.conf
> done
> exit_status=0
> if [ -x /etc/dhclient-exit-hooks ]; then
> . /etc/dhclient-exit-hooks
> fi
> # probably should do something with exit status of the local script
> exit $exit_status
> fi
>
> if [ x$reason = xEXPIRE ] || [ x$reason = xFAIL ]; then
> if [ x$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 $interface inet down
> fi
> if [ x$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_status=0
> if [ -x /etc/dhclient-exit-hooks ]; then
> . /etc/dhclient-exit-hooks
> fi
> # probably should do something with exit status of the local script
> exit $exit_status
> fi
>
> if [ x$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
> echo search $new_domain_name >/etc/resolv.conf.std
> for nameserver in $new_domain_name_servers; do
> echo nameserver $nameserver >>/etc/resolv.conf.std
> done
> if [ -f /etc/resolv.conf ]; then
> rm -f /etc/resolv.conf
> ln /etc/resolv.conf.std /etc/resolv.conf
> fi
> exit_status=0
> if [ -x /etc/dhclient-exit-hooks ]; then
> . /etc/dhclient-exit-hooks
> fi
> # probably should do something with exit status of the local script
> exit $exit_status
> fi
> ifconfig $interface inet down
> exit_status=1
> if [ -x /etc/dhclient-exit-hooks ]; then
> . /etc/dhclient-exit-hooks
> fi
> # probably should do something with exit status of the local script
> exit $exit_status
> fi
>
> exit_status=0
> if [ -x /etc/dhclient-exit-hooks ]; then
> . /etc/dhclient-exit-hooks
> fi
> # probably should do something with exit status of the local script
> exit $exit_status
>
>
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