diff --git a/README.md b/README.md
index 0ba5eeb1..904a4789 100644
--- a/README.md
+++ b/README.md
@@ -325,6 +325,7 @@ You don't have to do anything manually!
1. Google Cloud DNS API
1. ConoHa (https://www.conoha.jp)
1. netcup DNS API (https://www.netcup.de)
+1. GratisDNS.dk (https://gratisdns.dk)
And:
diff --git a/dnsapi/README.md b/dnsapi/README.md
index 47862d6c..891417f3 100644
--- a/dnsapi/README.md
+++ b/dnsapi/README.md
@@ -970,6 +970,26 @@ acme.sh --issue --dns dns_netcup -d example.com -d www.example.com
The `NC_Apikey`,`NC_Apipw` and `NC_CID` will be saved in `~/.acme.sh/account.conf` and will be reused when needed.
+## 52. Use GratisDNS.dk
+
+GratisDNS.dk (https://gratisdns.dj/) does not provide an API to update DNS records (other than IPv4 and IPv6
+dynamic DNS addresses). The acme.sh plugin therefore retrieves and updates domain TXT records by logging
+into the GratisDNS website to read the HTML and posting updates as HTTP. The plugin needs to know your
+userid and password for the GratisDNS website.
+
+```sh
+export GDNSDK_Username="..."
+export GDNSDK_Password="..."
+```
+The username and password will be saved in `~/.acme.sh/account.conf` and will be reused when needed.
+
+
+Now you can issue a certificate.
+
+```sh
+acme.sh --issue --dns dns_gdnsdk -d example.com -d *.example.com
+```
+
# Use custom API
If your API is not supported yet, you can write your own DNS API.
diff --git a/dnsapi/dns_gdnsdk.sh b/dnsapi/dns_gdnsdk.sh
new file mode 100755
index 00000000..7dc7894a
--- /dev/null
+++ b/dnsapi/dns_gdnsdk.sh
@@ -0,0 +1,168 @@
+#!/usr/bin/env sh
+#Author: Herman Sletteng
+#Report Bugs here: https://github.com/loial/acme.sh
+#
+#
+# Note, gratisdns requires a login first, so the script needs to handle
+# temporary cookies. Since acme.sh _get/_post currently don't directly support
+# cookies, I've defined wrapper functions _myget/_mypost to set the headers
+
+GDNSDK_API="https://admin.gratisdns.com"
+######## Public functions #####################
+#Usage: dns_gdnsdk_add _acme-challenge.www.domain.com "XKrxpRBosdIKFzxW_CT3KLZNf6q0HG9i01zxXp5CPBs"
+dns_gdnsdk_add() {
+ fulldomain=$1
+ txtvalue=$2
+ _info "Using gratisdns.dk"
+ _debug fulldomain "$fulldomain"
+ _debug txtvalue "$txtvalue"
+ if ! _gratisdns_login; then
+ _err "Login failed!"
+ return 1
+ fi
+ #finding domain zone
+ if ! _get_domain; then
+ _err "No matching root domain for $fulldomain found"
+ return 1
+ fi
+ # adding entry
+ _info "Adding the entry"
+ _mypost "action=dns_primary_record_added_txt&user_domain=$_domain&name=$fulldomain&txtdata=$txtvalue&ttl=1"
+ if _successful_update; then return 0; fi
+ _err "Couldn't create entry!"
+ return 1
+}
+
+#Usage: fulldomain txtvalue
+#Remove the txt record after validation.
+dns_gdnsdk_rm() {
+ fulldomain=$1
+ txtvalue=$2
+ _info "Using gratisdns.dk"
+ _debug fulldomain "$fulldomain"
+ _debug txtvalue "$txtvalue"
+ if ! _gratisdns_login; then
+ _err "Login failed!"
+ return 1
+ fi
+ if ! _get_domain; then
+ _err "No matching root domain for $fulldomain found"
+ return 1
+ fi
+ _findentry "$fulldomain" "$txtvalue"
+ if [ -z "$_id" ]; then
+ _info "Entry doesn't exist, nothing to delete"
+ return 0
+ fi
+ _debug "Deleting record..."
+ _mypost "action=dns_primary_delete_txt&user_domain=$_domain&id=$_id"
+ # removing entry
+
+ if _successful_update; then return 0; fi
+ _err "Couldn't delete entry!"
+ return 1
+}
+
+#################### Private functions below ##################################
+
+_checkcredentials() {
+ GDNSDK_Username="${GDNSDK_Username:-$(_readaccountconf_mutable GDNSDK_Username)}"
+ GDNSDK_Password="${GDNSDK_Password:-$(_readaccountconf_mutable GDNSDK_Password)}"
+
+ if [ -z "$GDNSDK_Username" ] || [ -z "$GDNSDK_Password" ]; then
+ GDNSDK_Username=""
+ GDNSDK_Password=""
+ _err "You haven't specified gratisdns.dk username and password yet."
+ _err "Please add credentials and try again."
+ return 1
+ fi
+ #save the credentials to the account conf file.
+ _saveaccountconf_mutable GDNSDK_Username "$GDNSDK_Username"
+ _saveaccountconf_mutable GDNSDK_Password "$GDNSDK_Password"
+ return 0
+}
+
+_checkcookie() {
+ GDNSDK_Cookie="${GDNSDK_Cookie:-$(_readaccountconf_mutable GDNSDK_Cookie)}"
+ if [ -z "$GDNSDK_Cookie" ]; then
+ _debug "No cached cookie found"
+ return 1
+ fi
+ _myget "action="
+ if (echo "$_result" | grep -q "logmeout"); then
+ _debug "Cached cookie still valid"
+ return 0
+ fi
+ _debug "Cached cookie no longer valid"
+ GDNSDK_Cookie=""
+ _saveaccountconf_mutable GDNSDK_Cookie "$GDNSDK_Cookie"
+ return 1
+}
+
+_gratisdns_login() {
+ if ! _checkcredentials; then return 1; fi
+
+ if _checkcookie; then
+ _debug "Already logged in"
+ return 0
+ fi
+ _debug "Logging into GratisDNS with user $GDNSDK_Username"
+
+ if ! _mypost "login=$GDNSDK_Username&password=$GDNSDK_Password&action=logmein"; then
+ _err "GratisDNS login failed for user $GDNSDK_Username bad RC from _post"
+ return 1
+ fi
+
+ GDNSDK_Cookie="$(grep -A 15 '302 Found' "$HTTP_HEADER" | _egrep_o 'Cookie: [^;]*' | _head_n 1 | cut -d ' ' -f2)"
+
+ if [ -z "$GDNSDK_Cookie" ]; then
+ _err "GratisDNS login failed for user $GDNSDK_Username. Check $HTTP_HEADER file"
+ return 1
+ fi
+ export GDNSDK_Cookie
+ _saveaccountconf_mutable GDNSDK_Cookie "$GDNSDK_Cookie"
+ return 0
+}
+
+_myget() {
+ #Adds cookie to request
+ export _H1="Cookie: $GDNSDK_Cookie"
+ _result=$(_get "$GDNSDK_API?$1")
+}
+_mypost() {
+ #Adds cookie to request
+ export _H1="Cookie: $GDNSDK_Cookie"
+ _result=$(_post "$1" "$GDNSDK_API")
+}
+
+_get_domain() {
+ _myget 'action=dns_primarydns'
+ _domains=$(echo "$_result" | _egrep_o ' domain="[[:alnum:].-_]+' | sed 's/^.*"//')
+ if [ -z "$_domains" ]; then
+ _err "Primary domain list not found!"
+ return 1
+ fi
+ for _domain in $_domains; do
+ if (_endswith "$fulldomain" "$_domain"); then
+ _debug "Root domain: $_domain"
+ return 0
+ fi
+ done
+ return 1
+}
+
+_successful_update() {
+ if (echo "$_result" | grep -q 'table-success'); then return 0; fi
+ return 1
+}
+
+_findentry() {
+ #returns id of dns entry, if it exists
+ _myget "action=dns_primary_changeDNSsetup&user_domain=$_domain"
+ _id=$(echo "$_result" | _egrep_o "| $1 | \s*$2 | [^?]*[^&]*&id=[^&]*" | sed 's/^.*=//')
+ if [ -n "$_id" ]; then
+ _debug "Entry found with _id=$_id"
+ return 0
+ fi
+ return 1
+}