US Robotics USR2410 Manuel d'installation télécharger pdf (Page 38)

34 5. Debian and other Software Packages

if [ −z "$DHCP" ]; then

ADDRESS=‘grep "address" ${IFACE} | awk ’{print $2}’‘

NETMASK=‘grep "netmask" ${IFACE} | awk ’{print $2}’‘

BROADCAST=‘grep "broadcast" ${IFACE} | awk ’{print $2}’‘

GATEWAY=‘grep "gateway" ${IFACE} | awk ’{print $2}’‘

ifconﬁg ${INTERFACE} ${ADDRESS} netmask ${NETMASK} broadcast ${BROADCAST} up

ping −r −c 1 ${GATEWAY} &> /dev/null

SUCCESS=$?

ifconﬁg "${INTERFACE}" down

if [ "${SUCCESS}" = 0 ]; then

echo $s

exit

ﬁ

done

#−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−

#Try to bring up the interface using DHCP (somewhat ugly since the DHCLIENT

#does not exit on failures but brings up the interface anyway, blech . . .)

for s in ${SCHEME}; do

IFACE=${SCHEME_DIR}/$s

DHCP=‘grep "dhcp" $IFACE‘

if [ −n "$DHCP" ]; then

/sbin/dhclient−2.2.x −e ${INTERFACE} > /tmp/DHCLIENT.log

SUCCESS=‘grep "DHCPACK" /tmp/DHCLIENT.log‘

kill ‘pidof dhclient−2.2.x‘

ifconﬁg "${INTERFACE}" down

rm −f /tmp/DHCLIENT.log

if [ −n "${SUCCESS}" ]; then

echo $s

exit

ﬁ

done

echo "@NO−RESPONSES@"

exit 0

Note: Weredeﬁne the layout of the IP-to-SCHEME map ﬁle /etc/laptop-net/ip-map. Each line in this ﬁle con-

tains nowtwo entries: ﬁrst the name of the scheme, and second the expected IP number under this scheme. If the

network interface is conﬁgured via DHCP,only the name of the scheme is collected. In this case, the second en-

try with the IP number is not necessary.

Note also: Weonly need one single scheme for DHCP evenifweuse this for more than one network. That’s

what the different proﬁles are for.

/etc/laptop-net/ip-map:

#schemes for different static IP addresses

scheme1 www.xxx.yyy.zzz =our expected IP address under scheme1

scheme2 WWW.XXX.YYY.ZZZ =our expected IP address under scheme2

#one single scheme for DHCP

scheme3 no IP number necessary

We also want to transfer the “control” of all network related boot scripts from the boot process rcS to the Laptop-

Net daemon ifd — without confusing the Debian package management system, of course. Todoso, we have to

remove the symlinks from the /etc/rcN.d directories and install them in the /etc/laptop-net/proﬁles/XXXX/rc.d,

where XXXX is one of home, work or local. Since the Debian boot-script manager update-rc.d will reinstall

these links as long as it ﬁnd the corresponding script in /etc/init.d, we have todiv ert these to a different location.

Diverting the boot script from init to ifd:

#!/bin/sh

mkdir /etc/laptop−net/init.d

PACKAGES="dns−clean fetchmail ippl lprng ntp ntpdate ppp scandetd ssh xinetd"

for p in $PACKAGES; do

dpkg−divert −−rename −−divert /etc/laptop−net/init.d/$p /etc/init.d/$p

update−rc.d $p remove

done

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US Robotics USR2410 Manuel d'installation Page 38

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