rs.lwip

#!/bin/sh

# Recovery script for LWIP.  Aside from restarting the LWIP service itself, the
# script aims to restart all of networking.  This includes in particular any
# network daemons: these daemons typically have open (listening) sockets that
# will now have become invalid, and the daemons typically do not know how to
# deal with that.  Unfortunately, there is no reliable way to determine the
# list of rc scripts that concern network daemons, so for now we hardcode a
# list of known ones here: this is the list of network-related rc.d scripts.
# FIXME: since we are not yet done importing etc/rc.d from NetBSD, this list is
# still incomplete and should be extended as more scripts are imported!
RC_SCRIPTS="dhclient dhcpcd dhcpd dhcrelay ftpd inetd named network rtadvd \
    sshd staticroute syslogd"

exec < /dev/console
exec > /dev/console
exec 2> /dev/console

export HOME=/
export PATH=/sbin:/usr/sbin:/bin:/usr/bin

. /etc/rc.subr
. /etc/rc.conf

# Restart the LWIP service.

# There is no need to shut down daemons before bringing back up the service.
# Note that "minix-service restart" does not do the same as these steps, and in
# fact breaks a proper LWIP restart.
restarts=$(grep restarts /proc/service/$1 | cut -d: -f2)
minix-service down "$1"
minix-service up /service/lwip -dev /dev/bpf -script /etc/rs.lwip \
    -restarts $(($restarts + 1))

# Reload TCP ISN, or make a new one if there is none.  Do not save anything.
TCPISN_FILE=/usr/adm/tcpisn.dat
TCPISN_LEN=$(sysctl -n net.inet.tcp.isn_secret | awk '{print length/2}')
if [ ! -f $TCPISN_FILE ]; then TCPISN_FILE=/dev/random; fi
sysctl -qw net.inet.tcp.isn_secret=`dd if=$TCPISN_FILE bs=$TCPISN_LEN \
    count=1 2>/dev/null | hexdump -v -e '/1 "%02x"'` 2>/dev/null

# Let LWIP find all network drivers before performing initialization.
sleep 1

# Restart all network daemons.

# Start with dhcpcd, which may be launched directly from ifconfig.if(5) scripts
# and therefore may not be enabled in, and thus stopped by, rc.d scripts below.
service dhcpcd onestop >/dev/null 2>&1

# Then stop and start all known network daemons using their rc.d scripts.
regex='/('"$(echo $RC_SCRIPTS | tr ' ' '|')"')$'
scripts=$(for rcd in ${rc_directories:-/etc/rc.d}; do
	test -d ${rcd} && echo ${rcd}/*; done)
files=$(rcorder ${scripts} | grep -E "$regex")

for _rc_elem in $(reverse_list $files); do
	# We have already stopped dhcpcd if it was running, so skip it here.
	[ $_rc_elem != /etc/rc.d/dhcpcd ] && run_rc_script $_rc_elem stop
done

for _rc_elem in $files; do
	run_rc_script $_rc_elem start
done