postinst is in snort 2.9.6.0-0ubuntu1.
This file is a maintainer script. It is executed when installing (*inst) or removing (*rm) the package.
The actual contents of the file can be viewed below.
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CONFIG=/etc/snort/snort.debian.conf
CONFIG_CHECKSUM=/var/lib/snort/snort.debian.conf.md5sum
# Create the checksum directory if it does not exist
if [ ! -d $(dirname $CONFIG_CHECKSUM) ]; then
mkdir $(dirname $CONFIG_CHECKSUM)
fi
. /usr/share/debconf/confmodule
test $DEBIAN_SCRIPT_DEBUG && set -v -x
# summary of how this script can be called:
# * <postinst> `configure' <most-recently-configured-version>
# * <old-postinst> `abort-upgrade' <new version>
# * <conflictor's-postinst> `abort-remove' `in-favour' <package>
# <new-version>
# * <deconfigured's-postinst> `abort-deconfigure' `in-favour'
# <failed-install-package> <version> `removing'
# <conflicting-package> <version>
# for details, see /usr/doc/packaging-manual/
#
# quoting from the policy:
# Any necessary prompting should almost always be confined to the
# post-installation script, and should be protected with a conditional
# so that unnecessary prompting doesn't happen if a package's
# installation fails and the `postinst' is called with `abort-upgrade',
# `abort-remove' or `abort-deconfigure'.
FIRSTINST=
RECONFIGURE=
if [ "$1" = "reconfigure" ] || [ -n "$DEBCONF_RECONFIGURE" ]; then
RECONFIGURE="true"
else
RECONFIGURE=
fi
if ([ "$1" = "install" ] || [ "$1" = "configure" ]) && [ -z "$2" ]; then
FIRSTINST="yes"
fi
if [ -z "$RECONFIGURE" ] && [ -z "$FIRSTINST" ]; then
UPGRADE="yes"
fi
case "$1" in
install)
;;
upgrade)
db_get snort/startup || true
if [ "$RET" = "manual" ]; then
echo "You have chosen to (re)start snort manually."
echo "Please restart Snort manually."
sleep 2
#db_fset snort/please_restart_manually seen false
#db_beginblock
#db_input high snort/please_restart_manually || true
#db_endblock
#db_go
#db_stop
fi
;;
configure)
# only mess with config file it exists; otherwise, assume that's the way the
# user wants it, but only if upgrading
if [ -e "$CONFIG" ] || [ -z "$UPGRADE" ]; then
# similarly, check for the existence of the checksum file; if it doesn't
# exist, assume that's the way the user wants it, but only if upgrading
if [ -e "$CONFIG_CHECKSUM" ] || [ -z "$UPGRADE" ]; then
# next, compare the current and stored checksums; if they do not match,
# assume that's the way the user wants it ... upgrading etc
if [ "$(md5sum "$CONFIG" 2>/dev/null)" = \
"$(cat "$CONFIG_CHECKSUM" 2>/dev/null)" ] || \
[ -z "$UPGRADE" ]; then
# they match; get ready to prepare a new version of the config file
overwrite_config="yes"
fi
fi
fi
# generate new config file
db_get snort/startup || true; STARTUP="$RET"
db_get snort/interface || true; INTERFACE="$RET"
db_get snort/address_range || true; ADDRESS_RANGE="$RET"
db_get snort/disable_promiscuous || true; DISABLE_PROMISCUOUS="$RET"
db_get snort/send_stats || true; STATS_SEND="$RET"
db_get snort/stats_rcpt || true; STATS_RCPT="$RET"
db_get snort/stats_treshold || true; STATS_THRESHOLD="$RET"
db_get snort/options || true; OPTIONS="$RET"
test "$DISABLE_PROMISCUOUS" = "true" && OPTIONS="$OPTIONS -p"
# Failsafe in case the values above are blank (jfs)
[ -z "$STATS_RCPT" ] && STATS_RCPT=root
[ -z "$STATS_THRESHOLD" ] && STATS_THRESHOLD=1
# STATS_RCPT=`echo "$STATS_RCPT" | sed -e 's/@/\\\\@/g' -e 's/,/\\\\,/g'`
# If this is an upgrade from a previous release that did not have
# a configuration checksum then try to determine if we can
# upgrade.
#
# To do this: tlest the current configuration against the old auto-generated configuration
# file if there is no configuration checksum and create one if it exists.
# Also, tell the script to overwrite with the new configuration file.
if [ ! -e "$CONFIG_CHECKSUM" ] && [ -e "$CONFIG" ] && dpkg --compare-versions "$2" lt-nl 2.8.5.2-6; then
OLD_CONFIG=$(tempfile)
cat <<EOF >>"$OLD_CONFIG"
# This file is used for options that are changed by Debian to leave
# the original lib files untouched.
# You have to use "dpkg-reconfigure snort" to change them.
DEBIAN_SNORT_STARTUP="$STARTUP"
DEBIAN_SNORT_HOME_NET="$ADDRESS_RANGE"
DEBIAN_SNORT_OPTIONS="$OPTIONS"
DEBIAN_SNORT_INTERFACE="$INTERFACE"
DEBIAN_SNORT_SEND_STATS="$STATS_SEND"
DEBIAN_SNORT_STATS_RCPT="$STATS_RCPT"
DEBIAN_SNORT_STATS_THRESHOLD="$STATS_THRESHOLD"
EOF
if cmp -s "$CONFIG" "$OLD_CONFIG"; then
md5sum "$CONFIG" > "$CONFIG_CHECKSUM"
overwrite_config="yes"
fi
rm -f "$OLD_CONFIG"
fi
# Create the new configuration file based on debconf information
NEW_CONFIG=$(tempfile)
cat <<EOF >>"$NEW_CONFIG"
# snort.debian.config (Debian Snort configuration file)
#
# This file was generated by the post-installation script of the snort
# package using values from the debconf database.
#
# It is used for options that are changed by Debian to leave
# the original configuration files untouched.
#
# This file is automatically updated on upgrades of the snort package
# *only* if it has not been modified since the last upgrade of that package.
#
# If you have edited this file but would like it to be automatically updated
# again, run the following command as root:
# dpkg-reconfigure snort
DEBIAN_SNORT_STARTUP="$STARTUP"
DEBIAN_SNORT_HOME_NET="$ADDRESS_RANGE"
DEBIAN_SNORT_OPTIONS="$OPTIONS"
DEBIAN_SNORT_INTERFACE="$INTERFACE"
DEBIAN_SNORT_SEND_STATS="$STATS_SEND"
DEBIAN_SNORT_STATS_RCPT="$STATS_RCPT"
DEBIAN_SNORT_STATS_THRESHOLD="$STATS_THRESHOLD"
EOF
if ! cmp -s "$CONFIG" "$NEW_CONFIG"; then
if [ "$overwrite_config" = "yes" ] ;then
cp "$NEW_CONFIG" "$CONFIG.dpkg-new"
mv "$CONFIG.dpkg-new" "$CONFIG"
md5sum "$CONFIG" > "$CONFIG_CHECKSUM"
else
if [ ! -e "$CONFIG" ] ; then
echo "snort: not updating $CONFIG; file does not exist" >&2
else
if [ ! -e "$CONFIG_CHECKSUM" ] ; then
echo "snort: not updating $CONFIG; no stored checksum available and it does not match the debconf database configuration" >&2
else
echo "snort: not updating $CONFIG; file has been customized" >&2
fi
fi
fi
else
# Update the md5sum file
md5sum "$CONFIG" > "$CONFIG_CHECKSUM"
fi
rm -f "$NEW_CONFIG"
if [ -f /etc/snort/snort.conf ]; then
# Ensure the config file is readable by root.root and mode 600
if ! dpkg-statoverride --list /etc/snort/snort.conf >/dev/null
then
chown root:snort /etc/snort/snort.conf
chmod 640 /etc/snort/snort.conf
fi
fi
db_stop
# Check for left-over files from woody packages.
OLDCONF=/etc/snort/snort.rules.conf
if [ -f "$OLDCONF" ]; then
mv "$OLDCONF" "$OLDCONF.OBSOLETE"
fi
# Update the rc.d's
update-rc.d snort defaults >/dev/null
# in the case we reconfigure we have to restart and not just to start.
if [ -x "`which invoke-rc.d 2>/dev/null`" ]; then
invoke-rc.d snort stop || exit $?
else
/etc/init.d/snort stop || exit $?
fi
;;
abort-upgrade)
;;
*)
echo "postinst called with unknown argument \`$1'" >&2
exit 0
;;
esac
if [ "$STARTUP" = "dialup" ]; then
# Try to guess environments for all pppds we have no .env for...
for PPPD_PID in $(pidof pppd ipppd); do
# If we got an empty PID (however), we break here
test "$PPPD_PID" || continue
#
# This is a lot of shell voodoo, let's try to figure it out:
# 1. egrep:
# It greps for our current pppd PID in all pppd and ipppd
# pidfiles.
# It *should* return exactly one file name: the one with
# our current pppd PID in it; however, to be safe, we fence
# it with a head -1.
# 2. basename $(egrep ...) .pid:
# It takes the file name from the egrep and strips off its
# path and the .pid suffix
# 3. sed:
# Unfortunately the filenames of pppd and ipppd differ:
# pppd uses $INTERFACE.pid, while ipppd uses
# ipppd.$INTERFACE.pid.
# The .pid is already stripped off by basename, thus, we
# just strip off any "ipppd." prefix and end up in the
# plain interface name.
# Maybe pppd decides to change it's pidfile naming
# convention according to ipppd somewhere in the future,
# thus, we use '^i\?pppd\.' (sed eregex) and thus strip
# off all "ipppd." and all "pppd." prefixes. This doesn't
# harm anyways.
# Because of the pppd pidfile naming convention, our
# approach works always with ipppd and mostly with pppd:
# the latter only, if the user did not decide to rename
# his ppp interface to something else than ppp*
# (not possible currently, afaics).
#
PPP_IFACE=$(basename $(egrep -l "^[[:space:]]*$PPPD_PID[[:space:]]*\$" /var/run/ppp*.pid /var/run/ipppd.*.pid 2> /dev/null | head -1) .pid | sed -e 's/^i\?pppd\.//')
#
# If we got no interface from pidfiles (because there are no
# pidfiles, for example), we assume the most common case:
# one pppd with default route set.
# This is ugly, but there is no other chance. Let's hope,
# nobody ever manages multiple pppds without pidfiles for
# them.
#
test "$PPP_IFACE" || PPP_IFACE=$(route -n |
awk '/^0\.0\.0\.0 / { print $8 }')
# If we couldn't discover an interface name, we break here
test "$PPP_IFACE" || continue
PPP_LOCAL=$(ifconfig $PPP_IFACE |
awk '/inet addr:/ { gsub("addr:", ""); print $2 }')
# If we couldn't discover a local IP, we break here
test "$PPP_LOCAL" || continue
ENVFILE=/var/run/snort_$PPP_IFACE.env
# If we already have an .env for that interface, we break here
test -e "$ENVFILE" && continue
# Write .env for that interface
echo "Creating missing $ENVFILE"
echo "PPPD_PID=$PPPD_PID" > "$ENVFILE"
echo "PPP_IFACE=$PPP_IFACE" >> "$ENVFILE"
echo "PPP_LOCAL=$PPP_LOCAL" >> "$ENVFILE"
# If such a snort is still running, just kill it
ps -ef | grep /usr/sbin/snort | grep "$PPP_LOCAL" |
grep "$PPP_IFACE" | awk '{ print $2 }' |
xargs --no-run-if-empty kill -s KILL >/dev/null
done
fi
if [ "$STARTUP" = "boot" ] || [ "$STARTUP" = "dialup" ]; then
if [ -x "`which invoke-rc.d 2>/dev/null`" ]; then
invoke-rc.d snort start || exit $?
else
/etc/init.d/snort start || exit $?
fi
fi
# dh_installdeb will replace this with shell code automatically
# generated by other debhelper scripts.
exit 0
|