156 lines
3.4 KiB
Plaintext
156 lines
3.4 KiB
Plaintext
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# Set the hostname from DHCP data if required
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# A hostname can either be a short hostname or a FQDN.
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# hostname_fqdn=true
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hostname_fqdn=false
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# hostname_fqdn=server
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# A value of server means just what the server says, don't manipulate it.
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# This could lead to an inconsistent hostname on a DHCPv4 and DHCPv6 network
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# where the DHCPv4 hostname is short and the DHCPv6 has an FQDN.
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# DHCPv6 has no hostname option.
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# RFC4702 section 3.1 says FQDN should be prefered over hostname.
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#
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# As such, the default is hostname_fqdn=true so that a consistent hostname
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# is always assigned.
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: ${hostname_fqdn:=true}
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# Some systems don't have hostname(1)
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_hostname()
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{
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local name=
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if [ -z "$1" ]; then
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if type hostname >/dev/null 2>&1; then
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hostname
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elif [ -r /proc/sys/kernel/hostname ]; then
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read name </proc/sys/kernel/hostname && echo "$name"
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elif sysctl kern.hostname >/dev/null 2>&1; then
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sysctl -n kern.hostname
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elif sysctl kernel.hostname >/dev/null 2>&1; then
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sysctl -n kernel.hostname
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else
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return 1
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fi
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return $?
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fi
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# Always prefer hostname(1) if we have it
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if type hostname >/dev/null 2>&1; then
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#hostname "$1"
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hostnamectl set-hostname "$1"
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elif [ -w /proc/sys/kernel/hostname ]; then
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echo "$1" >/proc/sys/kernel/hostname
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elif sysctl kern.hostname >/dev/null 2>&1; then
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sysctl -w "kern.hostname=$1"
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elif sysctl kernel.hostname >/dev/null 2>&1; then
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sysctl -w "kernel.hostname=$1"
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else
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# We know this will fail, but it will now fail
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# with an error to stdout
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hostname "$1"
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fi
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}
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need_hostname()
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{
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local hostname hfqdn=false hshort=false
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case "$force_hostname" in
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[Yy][Ee][Ss]|[Tt][Rr][Uu][Ee]|1) return 0;;
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esac
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hostname="$(_hostname)"
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case "$hostname" in
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""|"(none)"|localhost|localhost.localdomain) return 0;;
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esac
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case "$hostname_fqdn" in
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[Yy][Ee][Ss]|[Tt][Rr][Uu][Ee]|1) hfqdn=true;;
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[Ss][Ee][Rr][Vv][Ee][Rr]) ;;
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*) hshort=true;;
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esac
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if [ -n "$old_fqdn" ]; then
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if ${hfqdn} || ! ${hsort}; then
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[ "$hostname" = "$old_fqdn" ]
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else
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[ "$hostname" = "${old_fqdn%%.*}" ]
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fi
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elif [ -n "$old_host_name" ]; then
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if ${hfqdn}; then
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if [ -n "$old_domain_name" -a \
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"$old_host_name" = "${old_host_name#*.}" ]
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then
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[ "$hostname" = \
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"$old_host_name.$old_domain_name" ]
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else
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[ "$hostname" = "$old_host_name" ]
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fi
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elif ${hshort}; then
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[ "$hostname" = "${old_host_name%%.*}" ]
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else
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[ "$hostname" = "$old_host_name" ]
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fi
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else
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# No old hostname
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false
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fi
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}
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try_hostname()
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{
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if valid_domainname "$1"; then
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_hostname "$1"
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else
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syslog err "Invalid hostname: $1"
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fi
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}
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set_hostname()
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{
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local hfqdn=false hshort=false
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need_hostname || return
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case "$hostname_fqdn" in
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[Yy][Ee][Ss]|[Tt][Rr][Uu][Ee]|1) hfqdn=true;;
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"") ;;
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*) hshort=true;;
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esac
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if [ -n "$new_fqdn" ]; then
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if ${hfqdn} || ! ${hshort}; then
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try_hostname "$new_fqdn"
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else
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try_hostname "${new_fqdn%%.*}"
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fi
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elif [ -n "$new_host_name" ]; then
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if ${hfqdn}; then
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if [ -n "$new_domain_name" -a \
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"$new_host_name" = "${new_host_name#*.}" ]
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then
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try_hostname "$new_host_name.$new_domain_name"
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else
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try_hostname "$new_host_name"
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fi
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elif ${hshort}; then
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try_hostname "${new_host_name%%.*}"
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else
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try_hostname "$new_host_name"
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fi
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fi
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}
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# For ease of use, map DHCP6 names onto our DHCP4 names
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case "$reason" in
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BOUND6|RENEW6|REBIND6|REBOOT6|INFORM6)
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new_fqdn="$new_dhcp6_fqdn"
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;;
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esac
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if $if_up; then
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set_hostname
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fi
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