bin/set_cellular_ppp

#!/bin/dash

# Copyright (c) 2013 The Chromium OS Authors. All rights reserved.
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.

# Set the PPP username and password to be used when making connections on
# a cellular service.

PROGRAM=$(basename $0)
FLAGS_HELP="Usage:

Show current PPP username
  ${PROGRAM}

Set PPP username and/or password
  ${PROGRAM} [-u <username>] [-p <password>]

Clear PPP username and password
  ${PROGRAM} -c
"

. /usr/share/misc/shflags

FLIMFLAM=org.chromium.flimflam
IMANAGER=${FLIMFLAM}.Manager
ISERVICE=${FLIMFLAM}.Service
USERNAME_PROPERTY=Cellular.PPP.Username
PASSWORD_PROPERTY=Cellular.PPP.Password

usage() {
  echo $*
  echo
  flags_help
  exit 1
}

dbus() {
  local object="$1"
  local method="$2"
  shift 2

  dbus-send --system --print-reply --fixed --dest="${FLIMFLAM}" \
    "${object}" "${method}" "$@"
}

get_service_property() {
  local service="$1"
  local property="$2"

  dbus "${service}" "${ISERVICE}.GetProperties" 2>/dev/null \
    | sed -n "/\/${property}/{s/.* //p}"
}

display_username() {
  local service="$1"
  local username="$(get_service_property ${service} ${USERNAME_PROPERTY})"

  if [ -n "${username}" ]; then
    echo "PPP username: " ${username}
    exit 0
  fi

  echo "No PPP username."
  exit 0
}

set_username() {
  local service="$1"
  local username="$2"

  echo "Setting PPP username \"${username}\" for service ${service}"
  dbus "${service}" "${ISERVICE}.SetProperty" \
    "string:${USERNAME_PROPERTY}" "variant:string:${username}"
}

set_password() {
  local service="$1"
  local password="$2"

  echo "Setting PPP pasword for service ${service}"
  dbus "${service}" "${ISERVICE}.SetProperty" \
    "string:${PASSWORD_PROPERTY}" "variant:string:${password}"
}

clear_property() {
  local service="$1"
  local property="$2"

  echo "Clearing ${property} for service ${service}"
  dbus "${service}" "${ISERVICE}.ClearProperty" "string:${property}"
}

get_services() {
  dbus / "${IMANAGER}.GetProperties" 2>/dev/null \
    | sed -n "/\/Services\//{s/.* //p}"
}

get_first_cellular_service() {
  local service
  local service_type

  for service in $(get_services); do
    service_type="$(get_service_property ${service} Type)"
    if [ "${service_type}" = "cellular" ]; then
      echo "${service}"
      break
    fi
  done
}

service="$(get_first_cellular_service)"
if [ -z "${service}" ]; then
  echo "No cellular service exists."
  exit 1
fi

if [ $# -lt 1 ]; then
  display_username "${service}"
fi

DEFINE_string 'username' "" 'PPP username for the Service' 'u'
DEFINE_string 'password' "" 'PPP password for the Service' 'p'
DEFINE_boolean 'clear' false \
  'clear any username and password that has been previously set' 'c'
FLAGS "$@" || exit 1
eval set -- "${FLAGS_ARGV}"

if [ "${FLAGS_clear}" -ne 0 ]; then
  if [ $# -ne 0 ]; then
    usage "Too many arguments."
  fi
  if [ -n "${FLAGS_username}" ]; then
    set_username "${service}" "${FLAGS_username}"
  fi
  if [ -n "${FLAGS_password}" ]; then
    set_password "${service}" "${FLAGS_password}"
  fi
else
  if [ $# -ne 0 ]; then
    usage "Too many arguments."
  fi
  clear_property "${service}" "${USERNAME_PROPERTY}"
  clear_property "${service}" "${PASSWORD_PROPERTY}"
fi