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# This source code is released into the public domain.
#
# Utility functions for DNS-based authorizations.
# Retrieve the nameservers for a given domain. On failure, prints an error
# message and exits.
lfacme_dns_getnameservers() {
local domain="$1"
# Keep removing labels from the name until we find one with nameservers.
local _trydomain="$domain"
while ! [ -z "$_trydomain" ]; do
if [ "$_trydomain" = "${_trydomain#*.}" ]; then
# If there are no dots in the domain, we couldn't
# find the nameservers.
break
fi
# For CNAME records, a query for NS will return the CNAME.
# Therefore we have to check we actually got NS records.
local nameservers="$(
dig "$_trydomain" ns +noall +answer | \
awk '$4 == "NS" { print $5 }'
)"
if ! [ -z "$nameservers" ]; then
echo "$nameservers"
return
fi
_trydomain="${_trydomain#*.}"
done
_fatal "unable to find nameservers for %s" "$_trydomain"
}
# Wait for the DNS record to appear on a specific nameserver.
lfacme_dns_wait_for_nameserver() {
local domain="$1"
local auth="$2"
local nameserver="$3"
_verbose "waiting for nameserver %s" "$nameserver"
local waited=0
local waitlimit=60
while sleep 1; do
waited=$((waited + 1))
if [ "$waited" -ge "$waitlimit" ]; then
_error "timed out waiting for '%s' on '%s'" \
"$domain" "$nameserver"
return 1
fi
local _rdatas="$(
dig "_acme-challenge.$domain" txt @$nameserver \
+noall +answer \
| awk '$4 == "TXT" { print $5 }'
)"
for rdata in $_rdatas; do
if [ "$rdata" = "\"$auth\"" ]; then
return 0
fi
done
done
}
# Wait for DNS servers to have the given record.
lfacme_dns_wait_for_record() {
local domain="$1"
local auth="$2"
local nameservers="$(lfacme_dns_getnameservers "$domain")"
_verbose "waiting for the DNS record '%s' to be published" "$domain"
for ns in $nameservers; do
if ! lfacme_dns_wait_for_nameserver "$domain" "$auth" "$ns"; then
return 1
fi
done
return 0
}
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