#!/bin/bash
# SPDX-Version: 3.0
# SPDX-CreationInfo: 2025-02-13; WEIDNER, Marc S.; <cendev@coresecret.eu>
# SPDX-ExternalRef: GIT https://cendev.eu/marc.weidner/CISS.2025.debian.installer.git
# SPDX-FileContributor: WEIDNER, Marc S.; Centurion Intelligence Consulting Agency
# SPDX-FileCopyrightText: 2024-2025; WEIDNER, Marc S.; <cendev@coresecret.eu>
# SPDX-FileType: SOURCE
# SPDX-License-Identifier: EUPL-1.2 OR LicenseRef-CCLA-1.0
# SPDX-LicenseComment: This file is part of the CISS.2025.hardened.installer framework.
# SPDX-PackageName: CISS.2025.hardened.installer
# SPDX-Security-Contact: security@coresecret.eu

###########################################################################################
# 3.7.9. Functions - installation - setup hostname                                        #
###########################################################################################

###########################################################################################
# Generate files: '/etc/hostname' | '/etc/hosts' | '/etc/mailname'
# Globals:
#   FINAL_FQDN
#   FINAL_IPV4_ADDRESS
#   FINAL_IPV6
#   FINAL_IPV6_ADDRESS
#   MODULE_ERR
#   MODULE_TXT
#   TARGET
#   network_hostname
#   network_ipv6
# Arguments:
#   None
###########################################################################################
3_7_9_functions_installation_setup_hostname() {
  declare -g -x MODULE_ERR="3_7_9_functions_installation_setup_hostname"
  declare -g -x MODULE_TXT="Setup hostname '${network_hostname}'"
  do_show_header "${MODULE_TXT}"

  # Create '${TARGET}/etc/hostname' file.
  if [[ -f "${TARGET}"/etc/hostname ]]; then
    rm "${TARGET}"/etc/hostname
    do_log "info" "false" "Existing '${TARGET}/etc/hostname' removed."
  fi

  touch "${TARGET}"/etc/hostname
  chmod 0644 "${TARGET}"/etc/hostname
  cat << EOF >> "${TARGET}"/etc/hostname
"${FINAL_FQDN}"
EOF

  do_log "info" "false" "File generated: '${TARGET}/etc/hostname' | hostname '${network_hostname}'."

  # Create '${TARGET}/etc/mailname' file.
  if [[ -f "${TARGET}"/etc/mailname ]]; then
    rm "${TARGET}"/etc/mailname
    do_log "info" "false" "Existing '${TARGET}/etc/mailname' removed."
  fi

  touch "${TARGET}"/etc/mailname
  chmod 0644 "${TARGET}"/etc/mailname
  cat << EOF >> "${TARGET}"/etc/mailname
"${FINAL_FQDN}"
EOF

  do_log "info" "false" "File generated: '${TARGET}/etc/mailname' | mailname '${network_hostname}'."

  # Generate '${TARGET}/etc/hosts' basic IPv4 entries
  if [[ -f "${TARGET}"/etc/hosts ]]; then
    rm "${TARGET}"/etc/hosts
    do_log "info" "false" "Existing '${TARGET}/etc/hosts' removed."
  fi

  touch "${TARGET}"/etc/hosts
  chmod 0644 "${TARGET}"/etc/hosts
  cat << EOF >> "${TARGET}"/etc/hosts
127.0.0.1 localhost
"${FINAL_IPV4_ADDRESS}" "${FINAL_FQDN}"

EOF

  do_log "info" "false" "File generated: '${TARGET}/etc/hosts' with basic IPv4 entries."

  # Generate '${TARGET}/etc/hosts' basic IPv6 entries
  if [[ ${FINAL_IPV6,,} == "true" || ${network_ipv6,,} == "true" ]]; then

    cat << EOF >> "${TARGET}"/etc/hosts
# The following lines are desirable for IPv6 capable hosts
::1     localhost ip6-localhost ip6-loopback
fe00::0 ip6-localnet
ff00::0 ip6-mcastprefix
ff02::1 ip6-allnodes
ff02::2 ip6-allrouters
ff02::3 ip6-allhosts
"${FINAL_IPV6_ADDRESS}" "${FINAL_FQDN}"

EOF

    do_log "info" "false" "File updated: '${TARGET}/etc/hosts' with basic IPv6 entries."

  fi

  do_show_footer "${MODULE_TXT}"
}
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