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dhcpcd-hooks
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30-hostname
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# Set the hostname from DHCP data if required # A hostname can either be a short hostname or a FQDN. # hostname_fqdn=true # hostname_fqdn=false # hostname_fqdn=server # A value of server means just what the server says, don't manipulate it. # This could lead to an inconsistent hostname on a DHCPv4 and DHCPv6 network # where the DHCPv4 hostname is short and the DHCPv6 has an FQDN. # DHCPv6 has no hostname option. # RFC4702 section 3.1 says FQDN should be prefered over hostname. # # As such, the default is hostname_fqdn=true so that a consistent hostname # is always assigned. : ${hostname_fqdn:=true} # If we used to set the hostname, but relinquish control of it, we should # reset to the default value. : ${hostname_default=(none)} # Some systems don't have hostname(1) _hostname() { if [ -z "${1+x}" ]; then if [ -r /proc/sys/kernel/hostname ]; then read name </proc/sys/kernel/hostname && echo "$name" elif command -v hostname >/dev/null 2>/dev/null; then hostname elif sysctl kern.hostname >/dev/null 2>&1; then sysctl -n kern.hostname elif sysctl kernel.hostname >/dev/null 2>&1; then sysctl -n kernel.hostname else return 1 fi return $? fi if [ -w /proc/sys/kernel/hostname ]; then echo "$1" >/proc/sys/kernel/hostname elif [ -n "$1" ] && command -v hostname >/dev/null 2>&1; then hostname "$1" elif sysctl kern.hostname >/dev/null 2>&1; then sysctl -w "kern.hostname=$1" >/dev/null elif sysctl kernel.hostname >/dev/null 2>&1; then sysctl -w "kernel.hostname=$1" >/dev/null else # May fail to set a blank hostname hostname "$1" fi } is_default_hostname() { case "$1" in ""|"$hostname_default"|localhost|localhost.localdomain) return 0;; esac return 1 } need_hostname() { # Always load the hostname variable for future use hostname="$(_hostname)" is_default_hostname "$hostname" && return 0 case "$force_hostname" in [Yy][Ee][Ss]|[Tt][Rr][Uu][Ee]|1) return 0;; esac if [ -n "$old_fqdn" ]; then if ${hfqdn} || ! ${hshort}; then [ "$hostname" = "$old_fqdn" ] else [ "$hostname" = "${old_fqdn%%.*}" ] fi elif [ -n "$old_host_name" ]; then if ${hfqdn}; then if [ -n "$old_domain_name" ] && [ "$old_host_name" = "${old_host_name#*.}" ] then [ "$hostname" = \ "$old_host_name.$old_domain_name" ] else [ "$hostname" = "$old_host_name" ] fi elif ${hshort}; then [ "$hostname" = "${old_host_name%%.*}" ] else [ "$hostname" = "$old_host_name" ] fi else # No old hostname false fi } try_hostname() { [ "$hostname" = "$1" ] && return 0 if valid_domainname "$1"; then syslog info "Setting hostname: $1" _hostname "$1" else syslog err "Invalid hostname: $1" fi } set_hostname() { hfqdn=false hshort=false case "$hostname_fqdn" in [Yy][Ee][Ss]|[Tt][Rr][Uu][Ee]|1) hfqdn=true;; ""|[Ss][Ee][Rr][Vv][Ee][Rr]) ;; *) hshort=true;; esac need_hostname || return 0 if [ -n "$new_fqdn" ]; then if ${hfqdn} || ! ${hshort}; then try_hostname "$new_fqdn" else try_hostname "${new_fqdn%%.*}" fi elif [ -n "$new_host_name" ]; then if ${hfqdn}; then if [ -n "$new_domain_name" ] && [ "$new_host_name" = "${new_host_name#*.}" ] then try_hostname "$new_host_name.$new_domain_name" else try_hostname "$new_host_name" fi elif ${hshort}; then try_hostname "${new_host_name%%.*}" else try_hostname "$new_host_name" fi elif ! is_default_hostname "$hostname"; then try_hostname "$hostname_default" fi } # For ease of use, map DHCP6 names onto our DHCP4 names case "$reason" in BOUND6|RENEW6|REBIND6|REBOOT6|INFORM6) new_fqdn="$new_dhcp6_fqdn" old_fqdn="$old_dhcp6_fqdn" ;; esac if $if_configured && $if_up && [ "$reason" != ROUTERADVERT ]; then set_hostname fi