40 lines
811 B
Text
40 lines
811 B
Text
# Lookup the hostname in DNS if not set
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lookup_hostname()
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{
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[ -z "$new_ip_address" ] && return 1
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local h=
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# Silly ISC programs love to send error text to stdout
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if type dig >/dev/null 2>&1; then
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h=$(dig +short -x $new_ip_address)
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if [ $? = 0 ]; then
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echo "$h" | sed 's/\.$//'
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return 0
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fi
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elif type host >/dev/null 2>&1; then
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h=$(host $new_ip_address)
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if [ $? = 0 ]; then
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echo "$h" \
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| sed 's/.* domain name pointer \(.*\)./\1/'
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return 0
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fi
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elif type getent >/dev/null 2>&1; then
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h=$(getent hosts $new_ip_address)
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if [ $? = 0 ]; then
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echo "$h" | sed 's/[^ ]* *\([^ ]*\).*/\1/'
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return 0
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fi
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fi
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return 1
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}
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set_hostname()
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{
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if [ -z "$new_host_name" -a -z "$new_fqdn_name" ]; then
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export new_host_name="$(lookup_hostname)"
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fi
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}
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if $if_up; then
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set_hostname
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fi
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