#!/bin/bash
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.
#
# Copyright (C) 2007 Vino Fernando Crescini  <vfcrescini@gmail.com>
# Version 0.2

# Quick and dirty script to send sms via the Exetel gateway

progname="sms_send"
progver="0.2"

function print_usage()
{
  echo "Usage:"
  echo "  ${progname} -h"
  echo "  ${progname} -v"
  echo "  ${progname} [-c config-file] sender mobile-number[,mobile-number[,...]]"
}

# parse arguments
args=`getopt -q hvc: ${*}`

if [ ${?} != 0 ]; then
  print_usage >&2
  exit 1
fi

unset cfgfile
unset cfgflag

set -- ${args}
for i; do
  case "${i}" in
    -h)
      print_usage
      exit 0
      ;;
    -v)
      echo "${progname} ${progver}"
      exit 0
      ;;
    -c)
      cfgfile=`eval echo ${2}`
      cfgflag=1
      shift
      shift
      ;;
    --)
      shift
      break
      ;;
  esac
done

sender=`eval echo ${1}`
sendee=`eval echo ${2}`

if [ -z "${sender}" ] || [ -z "${sendee}" ]; then
  print_usage >&2
  exit 1
fi

# global config file
if [ -r /etc/sms_send.conf ]; then
  . /etc/sms_send.conf
fi

# rc file
if [ -r ~/.sms_sendrc ]; then
  . ~/.sms_sendrc
fi

# given config file
if [ -r "${cfgfile}" ]; then
  . "${cfgfile}"
elif [ "${cfgflag}" = "1" ]; then
  echo "cannot read config file ${cfgfile}" >&2
  exit 2
fi

if [ -z "${SMS_CURL}" ]; then
  echo "SMS_CURL not defined"
  exit 3
fi
if [ -z "${SMS_URL}" ]; then
  echo "SMS_URL not defined"
  exit 3
fi
if [ -z "${SMS_USR}" ]; then
  echo "SMS_USR not defined"
  exit 3
fi
if [ -z "${SMS_PWD}" ]; then
  echo "SMS_PWD not defined"
  exit 3
fi

# check if curl is installed and whether it's usable
if ! [ -x ${SMS_CURL} ]; then
  echo "sms_send requires curl" >&2
  exit 4
fi
if ! curl -V | grep Protocols: | grep -q https || ! curl -V | grep Features: | grep -q SSL; then
  echo "sms_send requires curl with SSL support" >&2
  exit 5
fi

# read the first 160 characters from stdin, replacing newline with space
temp=`head -c 160`

# escape special characters
mesg=`echo -n -e ${temp} | sed -e "s/%/%25/g" | sed -e "s/&/%26/g" | sed -e "s/+/%2B/g" |  sed -e "s/#/%23/g" | sed -e "s/=/%3D/g" | sed -e "s/\//%2F/g" | sed -e "s/,/%2C/g" | sed -e "s/:/%3A/g" | sed -e "s/;/%3B/g" | sed -e "s/@/%40/g" | sed -e "s/ /%20/g"`

# now do it
ref=`date +%Y%m%d%H%M%S`
res=`${SMS_CURL} -q -s -k "${SMS_URL}?username=${SMS_USR}&password=${SMS_PWD}&mobilenumber=${sendee}&sender=${sender}&messagetype=Text&referencenumber=${ref}&message=${mesg}"`
sta=${?}

# check what curl returned
if [ "${?}" != "0" ]; then
  echo "curl returned ${?}" >&2
  exit $[100 + ${?}]
fi

# check if the server returned something in the correct format
res=`echo ${res} | head -n 1 | grep "[0-9]|.*|.*|.*"`

if [ "${?}" != "0" ]; then
  echo "incorrect format received from server" >&2
  exit 6
fi

# check what the server returned
scode="${res%%|*}"
stext="${res##*|}"

if [ "${scode}" != "1" ]; then
  echo "failed to send: ${stext}"
  exit $[200 + ${scode}]
fi

exit 0