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9494671269
to handle changed command line arguments, and attempt to make it resilient in the face of future changes. TEST=Run script on fresh image; confirm that '-I eth_test' is present on the exec line of /etc/init/flimflam.conf Review URL: http://codereview.chromium.org/2842023
133 lines
4.3 KiB
Bash
Executable File
133 lines
4.3 KiB
Bash
Executable File
#!/bin/bash
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# Copyright (c) 2009 The Chromium OS Authors. All rights reserved.
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# Use of this source code is governed by a BSD-style license that can be
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# found in the LICENSE file.
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echo "Configuring for backchannel network device"
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testif=eth_test
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# Prevent flimflam from taking control of the backchannel network device.
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ORIG_CONF=${ROOT_FS_DIR}/etc/init/flimflam.conf
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TEMP_CONF=${ORIG_CONF}.tmp
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sed "s,/usr/sbin/flimflamd,/usr/sbin/flimflamd -I ${testif}," ${ORIG_CONF} > ${TEMP_CONF}
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mv -f ${TEMP_CONF} ${ORIG_CONF}
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# Arrange to run dhclient on the backchannel device but without
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# installing the default route, and stashing said route away for later
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# installation as a host route.
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cat > ${ROOT_FS_DIR}/etc/udev/rules.d/50-backchannel-network.rules <<EOF
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KERNEL=="eth*", SUBSYSTEMS=="usb", ACTION=="add", RUN+="/sbin/backchannel-setup %k"
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KERNEL=="${testif}", SUBSYSTEMS=="usb", ACTION=="remove", RUN+="kill \$(cat /var/run/dhclient-%k.pid)"
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EOF
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cat > ${ROOT_FS_DIR}/sbin/backchannel-setup <<EOF
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#!/bin/sh
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testif=${testif}
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if [ ! -f /mnt/stateful_partition/etc/enable_backchannel_network ]; then
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# This mechanism has to be explicitly enabled on the device.
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exit
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fi
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if [ -f /var/run/dhclient-\${testif}.pid ]; then
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# Something else is already going on - perhaps a second
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# USB Ethernet device has been inserted. Let's not mess with it.
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exit
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fi
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if [ "\$1" != "\${testif}" ]; then
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initctl stop flimflam
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# \$1 is the current name of the backchannel device. Swap it with testif.
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if ifconfig \${testif} > /dev/null 2>&1; then
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orig_mac=\$(ifconfig \${testif} | awk '/HWaddr/ {print \$5}')
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ifconfig \${testif} down # must be down for nameif to work
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nameif eth_tmp \${orig_mac}
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fi
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bdev_mac=\$(ifconfig \$1 | awk '/HWaddr/ {print \$5}')
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ifconfig \$1 down # must be down for nameif to work
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nameif \${testif} \${bdev_mac}
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if [ -n "\${orig_mac}" ]; then
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nameif \$1 \${orig_mac}
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fi
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initctl start flimflam
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fi
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# Bring up the backchannel interface
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dhclient -q -pf /var/run/dhclient-\${testif}.pid \\
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-lf /var/run/dhclient-\${testif}.leases \\
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-cf /etc/dhclient-backchannel.conf \\
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-sf /sbin/dhclient-backchannel-script \\
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\${testif}
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EOF
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chmod +x ${ROOT_FS_DIR}/sbin/backchannel-setup
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cat > ${ROOT_FS_DIR}/etc/dhclient-backchannel.conf <<EOF
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request subnet-mask, broadcast-address, routers;
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EOF
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cat > ${ROOT_FS_DIR}/sbin/dhclient-backchannel-script <<EOF
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#!/bin/sh
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if [ -n "\$new_broadcast_address" ]; then
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new_broadcast_arg="broadcast \$new_broadcast_address"
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fi
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if [ -n "\$new_subnet_mask" ]; then
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new_subnet_arg="netmask \$new_subnet_mask"
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fi
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case "\$reason" in
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MEDIUM|ARPCHECK|ARPSEND)
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# Do nothing
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;;
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PREINIT)
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# The DHCP client is requesting that an interface be
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# configured as required in order to send packets prior to
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# receiving an actual address. - dhclient-script(8)
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ifconfig \$interface inet 0 up
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# We need to give the kernel some time to get the interface up.
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sleep 1
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;;
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BOUND|RENEW|REBIND|REBOOT|TIMEOUT)
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if [ -n "\$old_ip_address" -a \
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"\$old_ip_address" != "\$new_ip_address" ]; then
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# IP address changed. Bringing down the interface will delete all routes,
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# and clear the ARP cache.
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ifconfig \$interface inet 0
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fi
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if [ -z "\$old_ip_address" -o "\$old_ip_address" != "\$new_ip_address" -o \
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"\$reason" = "BOUND" -o "\$reason" = "REBOOT" ]; then
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ifconfig \$interface inet \$new_ip_address \$new_subnet_arg \
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\$new_broadcast_arg \$mtu_arg
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# Since this script is for the backchannel testing interface,
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# we don't set the default route from here, but we do stash
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# it for possible later use in setting up a host route.
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cp /dev/null /var/run/dhclient-\${interface}.routers
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for router in \$new_routers; do
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echo \$router >> /var/run/dhclient-\${interface}.routers
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done
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fi
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;;
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EXPIRE|FAIL|RELEASE|STOP)
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if [ -n "\$old_ip_address" ]; then
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# Shut down interface, which will delete routes and clear arp cache.
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ifconfig \$interface inet 0
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fi
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;;
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esac
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EOF
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chmod +x ${ROOT_FS_DIR}/sbin/dhclient-backchannel-script
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