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contrib/dhcpcd/hooks/30-hostname
- This file was added.
| # 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. | |||||
| : ${hostname_default=localhost} | |||||
| # Some systems don't have hostname(1) | |||||
| _hostname() | |||||
| { | |||||
| if [ -z "${1+x}" ]; then | |||||
| if type hostname >/dev/null 2>&1; then | |||||
| hostname | |||||
| elif [ -r /proc/sys/kernel/hostname ]; then | |||||
| read name </proc/sys/kernel/hostname && echo "$name" | |||||
| 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 | |||||
| # Always prefer hostname(1) if we have it | |||||
| if type hostname >/dev/null 2>&1; then | |||||
| hostname "$1" | |||||
| elif [ -w /proc/sys/kernel/hostname ]; then | |||||
| echo "$1" >/proc/sys/kernel/hostname | |||||
| elif sysctl kern.hostname >/dev/null 2>&1; then | |||||
| sysctl -w "kern.hostname=$1" | |||||
| elif sysctl kernel.hostname >/dev/null 2>&1; then | |||||
| sysctl -w "kernel.hostname=$1" | |||||
| else | |||||
| # We know this will fail, but it will now fail | |||||
| # with an error to stdout | |||||
| hostname "$1" | |||||
| fi | |||||
| } | |||||
| set_hostname_vars() | |||||
| { | |||||
| hfqdn=false | |||||
| hshort=false | |||||
| case "$hostname_fqdn" in | |||||
| [Yy][Ee][Ss]|[Tt][Rr][Uu][Ee]|1) hfqdn=true;; | |||||
| ""|[Ss][Ee][Rr][Vv][Ee][Rr]) ;; | |||||
| *) hshort=true;; | |||||
| esac | |||||
| } | |||||
| need_hostname() | |||||
| { | |||||
| # Always load the hostname variable for future use | |||||
| hostname="$(_hostname)" | |||||
| case "$hostname" in | |||||
| ""|"(none)"|localhost|localhost.localdomain|"$hostname_default") | |||||
| return 0;; | |||||
| esac | |||||
| case "$force_hostname" in | |||||
| [Yy][Ee][Ss]|[Tt][Rr][Uu][Ee]|1) return 0;; | |||||
| esac | |||||
| set_hostname_vars | |||||
| 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: $1" | |||||
| fi | |||||
| } | |||||
| set_hostname() | |||||
| { | |||||
| need_hostname || return | |||||
| set_hostname_vars | |||||
| if [ -n "$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 "$new_host_name" | |||||
| fi | |||||
| elif [ -n "${hostname_default+x}" ]; 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_up; then | |||||
| set_hostname | |||||
| fi | |||||