check_amobile_usage.sh

#!/bin/sh

# Check usage for AMobile, a.k.a. AnnexTelecom.

show_usage ()
{
  local name=`basename "$0"`

  cat << EOF
Usage: $name [OPTIONS] -i ID -p PASSWORD
Description:
  Check cell phone usage for AMobile, a.k.a. AnnexTelecom.

  -i
      Assign the user ID.
  -c
      Assign the user password.
  -h
      Show usage.
EOF
}

send_mail ()
{
  local text="$1"

  echo "$text" | mailx -A gmail -s "$text" "[email protected]" >/dev/null 2>&1
}

handle_error ()
{
  local msg="$1"

  echo "$msg" >&2
  echo ""

  send_mail "$msg"
}


id=""
pw=""

while getopts ":i:p:" option; do
  case "$option" in
    i)
      id="$OPTARG"
      ;;
    p)
      pw="$OPTARG"
      ;;
    *)
      show_usage
      exit 1
      ;;
  esac
done

if [ -z "$id" -o -z "$pw" ]; then
  echo "Error: The user ID and password should be specified." >&2
  echo ""
  show_usage

  exit 1
fi

COOKIE=`mktemp`
if [ 0 -ne $? ]; then
  handle_error "Error: Failed to create a temporary file for the cookie."
  
  exit 1
fi

# http://archive.is/zGaCe
# http://archive.is/mRvpy
# http://archive.is/yDvBx
curl -s -f -X POST "http://annextele.com/csmenu/login_act.asp" -d "userid=$id&userpw=$pw" -c "$COOKIE" -o /dev/null
if [ 0 -ne $? ]; then
  handle_error "Error: Failed to login: $id"

  exit 1
fi

HTML=`mktemp`
if [ 0 -ne $? ]; then
  handle_error "Error: Failed to create a temporary file for the html."
  
  exit 1
fi

curl -s -f "http://annextele.com" -b "$COOKIE" -o "$HTML"
if [ 0 -ne $? ]; then
  handle_error "Error: Failed to get the html file."

  exit 1
fi

DATA=`mktemp`
if [ 0 -ne $? ]; then
  handle_error "Error: Failed to create a temporary file for the data."

  exit 1
fi

# http://archive.is/DixUD
xmllint --html --xpath '//li[@class="data"]/dl/dt/text()' "$HTML" > "$DATA" 2> /dev/null
if [ 0 -ne $? ]; then
  handle_error "Error: Failed to get data usage."

  exit 1
fi

tmp=`cat "$DATA" | cut -d" " -f1`

# Conversion from FLOAT to INT
# http://archive.is/a8GBU
# http://archive.is/nXlOA
# http://archive.is/BOF1X
d=${tmp%.*}
if [ 100 -gt $d ]; then
  HISTORY="$HOME/.amobile-$id"

  last=`cat "$HISTORY" 2>/dev/null`
  now=`TZ="Asia/Seoul" date +"%Y%m" 2>/dev/null`

  if [ "$last" != "$now" ]; then
    send_mail "WARN cell data $d MB remains: $id"

    echo "$now" > "$HISTORY"
  fi
fi

rm "$COOKIE" "$HTML" "$DATA"