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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. | |||||
: ${hostname_default=} | |||||
# Some systems don't have hostname(1) | |||||
_hostname() | |||||
{ | |||||
if [ -z "${1+x}" ]; then | |||||
if [ -r /proc/sys/kernel/hostname ]; then | |||||
read name </proc/sys/kernel/hostname && echo "$name" | |||||
elif type 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" ] && type 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 | |||||
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 |