sshgate-client-configure

#!/bin/bash
#
# Copyright (c) 2010 Linagora
# Patrick Guiran <guiran@linagora.com>
# http://github.com/Tauop/sshGate
#
# sshGate 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 2 of
# the License, or (at your option) any later version.
#
# sshGate 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 Lesser General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.
#

# Helper function to load dependencies ---------------------------------------
load() {
  local var= value= file=

  var="$1"; file="$2"
  value=$( eval "echo \"\${${var}:-}\"" )

  [ -n "${value}" ] && return 1;
  if [ -f "${file}" ]; then
    . "${file}"
    return 0
  fi
  return 2;
}

ERROR () { printf "[ERROR] %s\n" $*; }
FATAL () { ERROR $*; exit 1;         }

load SCRIPT_HELPER_DIRECTORY /etc/ScriptHelper.conf || FATAL "Can't load ScriptHelper"
load __LIB_MESSAGE__ "${SCRIPT_HELPER_DIRECTORY}/message.lib.sh" || FATAL 'Unable to load message.lib.sh'
load __LIB_ASK__     "${SCRIPT_HELPER_DIRECTORY}/ask.lib.sh"     || FATAL 'Unable to load ask.lib.sh'
load __LIB_RANDOM__  "${SCRIPT_HELPER_DIRECTORY}/random.lib.sh"  || FATAL "Unable to load random.lib.sh"

# Variables ------------------------------------------------------------------

SSH_CLIENT_DIR=~/.ssh
SSH_CONFIG_FILE="${SSH_CLIENT_DIR}/config"
TMP_FILE="/tmp/file.$(RANDOM)"
SSHGATE_GATE_ACCOUNT='sshgate'
SSHGATE_GATE_HOST='gate.par.lng'

# function -------------------------------------------------------------------

CONFIGURE_CLIENT () {
  # check if we need to configure
  grep '^Host sshgate' < "${SSH_CONFIG_FILE}" >/dev/null 2>/dev/null
  [ $? -eq 0 ] && return 0

  # create directory and file (in case they doesn't exist)
  mkdir "${SSH_CLIENT_DIR}"  >/dev/null
  touch "${SSH_CONFIG_FILE}" >/dev/null
  [ ! -w ~/.ssh/config ] && FATAL "Can't write into ${SSH_CONFIG_FILE}"

  BR
  MSG "  --- sshGate client configuration ---"
  MSG "         by Patrick Guiran"
  BR
  MSG "This script will help you to configure your ssh client in order to use sshGate."
  BR

  sshgate_user=
  sshgate_host=
  sshgate_sshkey=

  ASK sshgate_host    "What is the sshgGate hostname or IP address ? [${SSHGATE_GATE_HOST}]"              "${SSHGATE_GATE_HOST}"
  ASK sshgate_user    "What is the username to use when connecting to sshGate? [${SSHGATE_GATE_ACCOUNT}]" "${SSHGATE_GATE_ACCOUNT}"
  ASK sshgate_sshkey  "What is the SSH private key file to use for sshGate? [${SSH_CLIENT_DIR}/id_rsa]"   "${SSH_CLIENT_DIR}/id_rsa"

  ssh_config="
Host sshgate
  User ${sshgate_user}
  IdentityFile ${sshgate_sshkey}
  HostName ${sshgate_host}"

  # on enlève la conf sshgate de la conf client
sed -n -e '
/^Host sshgate/ {
  s/^..*$//;
  :loop
  n; s/^..*$//
  t loop;
}
/^.*$/p ' < "${SSH_CONFIG_FILE}" > "${TMP_FILE}"

  # on ajoute la conf sshgate de la conf client
  echo                 >> "${TMP_FILE}"
  echo "${ssh_config}" >> "${TMP_FILE}"
  echo                 >> "${TMP_FILE}"

  mv "${TMP_FILE}" "${SSH_CONFIG_FILE}" >/dev/null 2>/dev/null
  
  BR
  MSG "sshGate-client configured !"
  BR
}

# call CONFIGURE
CONFIGURE_CLIENT