dynamicdns: Fix passing password via stdin

* Add an option to pass the password via cmdline (optional, not used by
  plinth) if called manually.

* Fix: If -p option was not the last given option, everything after -p
  was lost.  Closes #310.

actions/dynamicdns

@@ -65,7 +65,7 @@ doGetOpt()
     basicauth=0
     ignoreCertError=0
 
-    while getopts ":s:d:u:p:I:U:c:b:" opt; do
+    while getopts ":s:d:u:P:I:U:c:b:p" opt; do
         case ${opt} in
             s)
                 if [ "${OPTARG}" != "${EMPTYSTRING}" ];then
@@ -80,6 +80,9 @@ doGetOpt()
             u)
                 user=${OPTARG}
             ;;
+            P)
+                pass=${OPTARG}
+            ;;
             p)
                 if read -t 0; then
                     IFS= read -r pass
@@ -293,7 +296,7 @@ doGetWANIP()
 doUpdate()
 {
     local dnsentry=$(nslookup "${host}"|tail -n2|grep A|sed s/[^0-9.]//g)
-    if [ "${dnsentry}" =  "${wanip}" ];then
+    if [ "${dnsentry}" = "${wanip}" ];then
         return
     fi
     if [ ! -z "${server}" ];then
@@ -428,6 +431,7 @@ case ${cmd} in
         echo "-s <server>             Gnudip Server address"
         echo "-d <domain>             Domain to be updated"
         echo "-u <user>               Account username"
+        echo "-P <password>           Account password"
         echo "-p                      Read Account Password from stdin"
         echo "-I <IP check URL>       A URL which returns the IP of the client who is requesting"
         echo "-U <update URL>         The update URL (a HTTP GET on this URL will be done)"