/usr/share/doc/ddns3-client/ddns-v3.txt is in ddns3-client 1.8-12.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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==============================
TCP based: ns.ddns.nu:2164
Requests:
<command>[ arg0 arg1 ...]\r\n
<command> := HELP | MOTD | LOGIN | LOGOUT | LIST | SET
| EXIT | QUIT
Responses:
+OK <arbitary text>\r\n
@RET <arbitary text>\r\n[<arbitary data>\r\n].\r\n
-ERR <arbitary text>\r\n
Welcome Banner:
DDNS v<version> ( <authentication types supported> )\r\n
Within the auth types returned their may be data required
for specific authentication methods, like challenge
cookies or public keys.
Command Details (core):
LOGIN <usrspec> <authspec>
Authenticate with server.
Arguments vary depending on authentication used
Plaintext (plaintext):
LOGIN <username> <password>
Crypt (crypt):
LOGIN <username> <crypt() password hash>
MD5 (md5):
LOGIN <username> <md5() password hash>
DDNS (ddns{<their challenge>};):
LOGIN <username> <password response>
response := md5(<password>":"<their challenge>)
Strong (strong{<their challenge>};):
LOGIN <user response> <password response> <our challenge>
user := md5(<username>":"<our challenge>)
pass := md5(<password>":"<their challenge>)
LOGOUT
Unauthenticates the current connection.
LIST
Allows an authenticated user to view their IP
handles
SET <handle name> <ip>
Allows an authenticated user to set one of their
handles to the supplied IP.
QUIT
Terminates the connection
Command Details (optional):
HELP
Optional command, Returns helpful information
MOTD
Optional command, Returns tha message of the day
EXIT
Optional command, terminates the connection
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