#!/bin/bash
# --------------------------------------------------------
# Script to connect to dyndns web site
# It should be run every week to be compatible
# with dyn.com new policy for free accounts
# Based on http://blog.stuart.shelton.me/archives/1024 
#
# Parameters :
#  $1 - Login
#  $2 - Password
#
#  Revision history :
#   06/10/2013, V1.0 - Creation by N. Bernaerts
# --------------------------------------------------------

# ---------- Beginning of user defined parameters -------------
# address where the mail should be sent
# keep it empty if you don't want notification mail
MAIL_DEST=""
# name of the email sender (whatever you want)
MAIL_FROM="Dyndns web script"
# subject of the mail
MAIL_SUBJ="Login to dyndns.org for"
# ---------------- End of user parameters ---------------------

# setup
DYN_ACCOUNT="$1"
DYN_PASSWORD="$2"

# parameters for dyndns login
DYN_LANGAGE="en-gb"
DYN_UA="Mozilla/5.0 (Windows NT 6.0) AppleWebKit/535.1 (KHTML, like Gecko) Chrome/13.0.782.112 Safari/535.1"
DYN_LOGIN="https://account.dyn.com/entrance/"
DYN_POST="$DYN_LOGIN"
DYN_CHECK="https://account.dyn.com/"

# temporary files
TMP_LOG=$(mktemp -t dyndns-XXXXXXXX.log)
TMP_EMAIL=$(mktemp -t dyndns-XXXXXXXX.email)
TMP_COOKIES=$(mktemp -t dyndns-XXXXXXXX.cookie)

# ------------------------------------------
#     Connect to dyndns account page
# ------------------------------------------

# init log file
echo "Account $DYN_ACCOUNT" > $TMP_LOG 

# fetching initial headers
echo "Fetching initial headers to pre-load cookies..." >> $TMP_LOG
curl -b $TMP_COOKIES -c $TMP_COOKIES -Ikso "$DST" -A "$DYN_UA" --url "$DYN_LOGIN"

# fetching UID
echo "Fetching UID..." >> $TMP_LOG
VALUE=$(curl -b $TMP_COOKIES -c $TMP_COOKIES -kso - -A "$DYN_UA" --url "$DYN_LOGIN" | grep -m 1 "multiform" | cut -d"'" -f 6)

# posting data
echo "Read UID as '$VALUE' - posting data..." >> $TMP_LOG
curl -b $TMP_COOKIES -c $TMP_COOKIES -d "username=$DYN_ACCOUNT" -d "password=$DYN_PASSWORD" -d "iov_id" -d "multiform=$VALUE" -e "$DYN_LOGIN" -kso "$DST" -A "$DYN_UA" --url "$DYN_POST"

# verifying result
echo "Response received - verifying result..." >> $TMP_LOG
curl -b $TMP_COOKIES -c $TMP_COOKIES -e "$DYN_POST" -kso - -A "$DYN_UA" -H "Accept-Language:$DYN_LANGAGE" --url "$DYN_CHECK" | grep -qE "<span>(Welcome|Hi)&nbsp;<b>$DYN_ACCOUNT</b></span>" && RESULT="Success" || { RESULT="Failed"; }

# display & log result
MESSAGE="$RESULT while connecting to $DYN_ACCOUNT account"
echo $MESSAGE
echo $MESSAGE >> $TMP_LOG
logger $MESSAGE

# ------------------------------------------
#        Send notification mail
# ------------------------------------------

if [ "$MAIL_DEST" != "" ]
then
  # prepare the mail body
  echo "to:$MAIL_DEST" > $TMP_EMAIL
  echo "from:$MAIL_FROM" >> $TMP_EMAIL
  echo "subject:$RESULT - $MAIL_SUBJ $DYN_ACCOUNT" >> $TMP_EMAIL

  # append the declaration log to the mail body
  echo "$MESSAGE" >> $TMP_EMAIL
  echo "" >> $TMP_EMAIL
  echo "------------ log -------------" >> $TMP_EMAIL
  echo "" >> $TMP_EMAIL
  cat $TMP_LOG >> $TMP_EMAIL

  # send the mail
  cat $TMP_EMAIL | sendmail -t
fi

# ------------------------------------------
#        Cleanup temporary files
# ------------------------------------------

rm $TMP_LOG
rm $TMP_COOKIES
rm $TMP_EMAIL