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#!/usr/bin/env bash
# Created : Tue 03 Jul 2007 11:54:53 PM EDT
# Modified : Thu 13 Sep 2007 06:35:56 AM PDT
# Author : Gautam Iyer <gi1242@users.sourceforge.net>
#
# Selects an msmtp account based on users current network. Type -h for a more
# detailed description.
#
# User settings
#
# Default setting used if the domain name can not be found, or if something goes
# wrong.
default='/usr/sbin/sendmail -oem -oi'
# Script uses bash-3.2. Exit if bash version is lower.
if (( BASH_VERSINFO[0] < 3 || BASH_VERSINFO[1] < 2 )); then
echo $default
exit
fi
# {{{1 Script Functions
function debug()
{
[[ -n $verbose ]] && echo -e "\033[31m$*\033[m" >> /dev/stderr
}
function print_usage()
{
echo "USAGE:"
echo " set_sendmail.sh [-v] -c config_file"
echo " set_sendmail.sh -h"
}
function print_help()
{
print_usage
cat << 'EOF'
DESCRIPTION:
Selects an msmtp account, based on the current host's domain name. This is
useful for laptop users who move the laptop between networks. Firewall
settings of your ISP may render your default smtp service useless, and force
you to use a different msmtp account. This script first matches
/etc/resolv.conf against a given set of (egrep) regular expressions. If a
match is found, it is used to decide which msmtp account to use.
If no match is found, this script tries to get the domain name. (NOTE: This
can be time consuming, as it could involve a name server lookup). The domain
name is then matched against a given set of (bash) regular expressions the
msmtp account is selected based on that.
The output of this script is suitable for use in the users .muttrc. For
instance, this script can be called via
set sendmail="`~/.mutt/set_sendmail.sh -c ~/.mutt/set_sendmail.conf`"
from the users ~/.muttrc.
The patterns, and msmtp accounts should be provided in the config file, and
are "sourced" directly into the script. Use bash compatible syntax, and look
at the example.
EOF
exit
}
# Check if a host is reachable
function check_host()
{
debug "Checking for host $1"
if [[ $host_pkg == 'bind' ]]; then
host $1 >& /dev/null
elif [[ $host_pkg == 'hostx' ]]; then
hostx -Q $1 >& /dev/null
else
# Fail
return 1
fi
}
# Function to get the domain name (in variable domainname).
function get_domainname()
{
debug "Getting domain name"
domainname=
ipaddr=
host_pkg=
if [[ -n $DNSDOMAIN ]]; then
domainname=$DNSDOMAIN
return
fi
# We need either 'host' (from bind-tools) or 'hostx' to proceed.
which hostx >& /dev/null && host_pkg='hostx'
[[ -z $host_pkg ]] && which host >& /dev/null && host_pkg='bind'
debug "Using host package '$host_pkg'"
# See if the internet is up
check_host whatismyip.org || return
# Try and get domain name from /etc/resolv.conf.
# 2007-07-10: If a vpn connection is active, then it usually adds the
# private search domain as the last field.
domainname=$(grep -E -m1 '^(search|domain)' /etc/resolv.conf | \
awk '{ print $NF }')
debug "Got domain '$domainname' from /etc/resolv.conf"
[[ -n $domainname ]] && return;
# Get ip address
#ipaddr=$(/sbin/ifconfig | grep 'inet addr:' | grep -v '127.0.0.1' | \
# cut -d: -f2 | awk '{ print $1}')
#ipaddr=$(w3m -dump whatismyip.org)
ipaddr=$(wget -qO- http://whatismyip.org)
debug "Got IP address '$ipaddr'"
[[ -z $ipaddr ]] && return
if [[ $host_pkg == bind ]]; then
domainname=$(host $ipaddr | sed -r 's/^.*pointer [^.]+\.(.*)\.$/\1/')
elif [[ $host_pkg == hostx ]]; then
domainname=$(hostx -Q $ipaddr | grep -m1 ^Name | sed -r 's/^[^.]+\.//')
fi
debug "Got domain name '$domainname'"
}
function do_account()
{
local account=$1
[[ $account == ssh ]] && ssh_tunnel
echo "$(which msmtp) -a $account"
exit 0
}
# {{{1 Main script
while getopts "hvc:" OPT; do
case $OPT in
"c") configFile=${OPTARG};;
"v") verbose=1;;
"h") print_help;;
"?") print_usage; exit;;
esac
done
if [[ -z $configFile || ! -r $configFile ]]; then
print_usage
exit
fi
source $configFile
# If we can't (or shouldn't) msmtp, then print default and exit
if [[ ! $HOSTNAME =~ $run_hosts ]] || ! which msmtp >& /dev/null; then
echo $default
exit
fi
# See if we can decide on the account based on /etc/resolv.conf
debug "Getting account from /etc/resolv.conf"
for ((i=0; i<${#accounts[*]}; i++ )); do
if [[ -n ${resolv_regexp[$i]} ]]; then
regexp=${resolv_regexp[$i]}
if [[ ${regexp:0:1} != '!' ]]; then
grep -E -q $regexp /etc/resolv.conf && do_account ${accounts[$i]}
else
grep -E -q ${regexp:1} /etc/resolv.conf || do_account ${accounts[$i]}
fi
fi
done
# Get the domain name
get_domainname
#echo "ipaddr=$ipaddr, domainname=$domainname."
# Decide which account to use
debug "Getting account from domainname ($domainname)"
for ((i=0; i<${#accounts[*]}; i++ )); do
if [[ $domainname =~ ${dom_regexp[$i]} ]]; then
do_account ${accounts[$i]}
fi
done
|
