1 OpenTTD's admin network
2 Last updated: 2011-01-20
3 ------------------------------------------------------------------------
9 2.0) Joining the network
10 3.0) Asking for updates
11 * 3.1) Polling manually
12 4.0) Sending rcon commands
16 7.0) Certain packet information
21 The admin network provides a dedicated network protocol designed for other
22 applications to communicate with OpenTTD. Connected applications can execute
23 console commands remotely (rcon commands) with no further authentication.
24 Furthermore information about clients and companies can be provided.
26 Admin applications remain connected when starting a new game or loading a saved
27 game in contrast to normal OpenTTD clients that get disconnected.
29 This document describes the admin network and its protocol.
31 Please refer to the mentioned enums in src/network/core/tcp_admin.h
33 Please also note that further improvements to the admin protocol can mean that
34 more packet types will be sent by the server. For forward compatibility it is
35 therefore wise to ignore unknown packets. Future improvements might also add
36 additional data to packets. This data should be ignored. Data will never be
37 removed from packets in later versions, except the possibility that complete
38 packets are dropped in favour of a new packet.
39 This though will be reflected in the protocol version as announced in the
40 ADMIN_PACKET_SERVER_PROTOCOL in section 2.0).
42 A reference implementation in Java for a client connecting to the admin interface
43 can be found at: http://dev.openttdcoop.org/projects/joan
46 2.0) Joining the network
47 ---- -------------------
48 Create a TCP connection to the server on port 3977. The application is
49 expected to authenticate within 10 seconds.
51 To authenticate send a ADMIN_PACKET_ADMIN_JOIN packet.
53 The server will reply with ADMIN_PACKET_SERVER_PROTOCOL followed directly by
54 ADMIN_PACKET_SERVER_WELCOME.
56 ADMIN_PACKET_SERVER_PROTOCOL contains details about the protocol version.
57 It is the job of your application to check this number and decide whether
58 it will remain connected or not.
59 Furthermore, this packet holds details on every AdminUpdateType and the
60 supported AdminFrequencyTypes (bitwise representation).
62 ADMIN_PACKET_SERVER_WELCOME contains details on the server and the map,
63 e.g. if the server is dedicated, its NetworkLanguage, size of the Map, etc.
65 Once you have received ADMIN_PACKET_SERVER_WELCOME you are connected and
66 authorized to do your thing.
67 The server will not provide any game related updates unless you ask for them.
68 There are four packets the server will none the less send, if applicable:
69 - ADMIN_PACKET_SERVER_ERROR
70 - ADMIN_PACKET_SERVER_WELCOME
71 - ADMIN_PACKET_SERVER_NEWGAME
72 - ADMIN_PACKET_SERVER_SHUTDOWN
74 However, ADMIN_PACKET_SERVER_WELCOME only after a ADMIN_PACKET_SERVER_NEWGAME
77 3.0) Asking for updates
78 ---- ------------------
79 Asking for updates is done with ADMIN_PACKET_ADMIN_UPDATE_FREQUENCY.
80 With this packet you define which update you wish to receive at which
83 Note: not every update type supports every frequency. If in doubt, you can
84 verify against the data received in ADMIN_PACKET_SERVER_PROTOCOL.
86 The server will not confirm your registered update. However, asking for an
87 invalid AdminUpdateType or a not supported AdminUpdateFrequency you will be
88 disconnected from the server with NETWORK_ERROR_ILLEGAL_PACKET.
90 Additional debug information can be found with a debug level of net=3.
92 ADMIN_UPDATE_DATE results in the server sending:
93 - ADMIN_PACKET_SERVER_DATE
95 ADMIN_UPDATE_CLIENT_INFO results in the server sending:
96 - ADMIN_PACKET_SERVER_CLIENT_JOIN
97 - ADMIN_PACKET_SERVER_CLIENT_INFO
98 - ADMIN_PACKET_SERVER_CLIENT_UPDATE
99 - ADMIN_PACKET_SERVER_CLIENT_QUIT
100 - ADMIN_PACKET_SERVER_CLIENT_ERROR
102 ADMIN_UPDATE_COMPANY_INFO results in the server sending:
103 - ADMIN_PACKET_SERVER_COMPANY_NEW
104 - ADMIN_PACKET_SERVER_COMPANY_INFO
105 - ADMIN_PACKET_SERVER_COMPANY_UPDATE
106 - ADMIN_PACKET_SERVER_COMPANY_REMOVE
108 ADMIN_UPDATE_COMPANY_ECONOMY results in the server sending:
109 - ADMIN_PACKET_SERVER_COMPANY_ECONOMY
111 ADMIN_UPDATE_COMPANY_STATS results in the server sending:
112 - ADMIN_PACKET_SERVER_COMPANY_STATS
114 ADMIN_UPDATE_CHAT results in the server sending:
115 - ADMIN_PACKET_SERVER_CHAT
117 ADMIN_UPDATE_CONSOLE results in the server sending:
118 - ADMIN_PACKET_SERVER_CONSOLE
121 ADMIN_UPDATE_CMD_LOGGING results in the server sending:
122 - ADMIN_PACKET_SERVER_CMD_LOGGING
124 3.1) Polling manually
125 ---- ----------------
126 Certain AdminUpdateTypes can also be polled:
128 - ADMIN_UPDATE_CLIENT_INFO
129 - ADMIN_UPDATE_COMPANY_INFO
130 - ADMIN_UPDATE_COMPANY_ECONOMY
131 - ADMIN_UPDATE_COMPANY_STATS
132 - ADMIN_UPDATE_CMD_NAMES
134 ADMIN_UPDATE_CLIENT_INFO and ADMIN_UPDATE_COMPANY_INFO accept an additional
135 parameter. This parameter is used to specify a certain client or company.
136 Setting this parameter to UINT32_MAX (0xFFFFFFFF) will tell the server you
137 want to receive updates for all clients or companies.
139 Not supported AdminUpdateType in the poll will result in the server
140 disconnecting the application with NETWORK_ERROR_ILLEGAL_PACKET.
142 Additional debug information can be found with a debug level of net=3.
145 4.0) Sending rcon commands
146 ---- ---------------------
147 Rcon runs separate from the ADMIN_UPDATE_CONSOLE AdminUpdateType. Requesting
148 the execution of a remote console command is done with the packet
149 ADMIN_PACKET_ADMIN_RCON.
151 Note: No additional authentication is required for rcon commands.
153 The server will reply with one or more ADMIN_PACKET_SERVER_RCON packets.
154 Finally an ADMIN_PACKET_ADMIN_RCON_END packet will be sent. Applications
155 will not receive the answer twice if they have asked for the AdminUpdateType
156 ADMIN_UPDATE_CONSOLE, as the result is not printed on the servers console
157 (just like clients rcon commands).
159 Furthermore, sending a 'say' command (or any similar command) will not
160 be sent back into the admin network.
161 Chat from the server itself will only be sent to the admin network when it
162 was not sent from the admin network.
164 Note that when content is queried or updated via rcon, the processing
165 happens asynchronously. But the ADMIN_PACKET_ADMIN_RCON_END packet is sent
166 already right after the content is requested as there's no immediate output.
167 Thus other packages and the output of content rcon command may be sent at
168 an arbitrary later time, mixing into the output of other console activity,
169 e.g. also of possible subsequent other rcon commands sent.
174 Sending a ADMIN_PACKET_ADMIN_CHAT results in chat originating from the server.
176 Currently four types of chat are supported:
177 - NETWORK_ACTION_CHAT
178 - NETWORK_ACTION_CHAT_CLIENT
179 - NETWORK_ACTION_CHAT_COMPANY
180 - NETWORK_ACTION_SERVER_MESSAGE
182 NETWORK_ACTION_SERVER_MESSAGE can be sent to a single client or company
183 using the respective DestType and ID.
184 This is a message prefixed with the 3 stars, e.g. *** foo has joined the game
188 Register ADMIN_UPDATE_CHAT at ADMIN_FREQUENCY_AUTOMATIC to receive chat.
189 The application will be able to receive all chat the server can see.
191 The configuration option network.server_admin_chat specifies whether
192 private chat for to the server is distributed into the admin network.
197 It is a kind thing to say good bye before leaving. Do this by sending the
198 ADMIN_PACKET_ADMIN_QUIT packet.
201 7.0) Certain packet information
202 ---- --------------------------
203 All ADMIN_PACKET_SERVER_* packets have an enum value greater 100.
205 ADMIN_PACKET_SERVER_WELCOME
206 Either directly follows ADMIN_PACKET_SERVER_PROTOCOL or is sent
207 after a new game has been started or a map loaded, i.e. also
208 after ADMIN_PACKET_SERVER_NEWGAME.
210 ADMIN_PACKET_SERVER_CLIENT_JOIN and ADMIN_PACKET_SERVER_COMPANY_NEW
211 These packets directly follow their respective INFO packets. If you receive
212 a CLIENT_JOIN / COMPANY_NEW packet without having received the INFO packet
213 it may be a good idea to POLL for the specific ID.
215 ADMIN_PACKET_SERVER_CMD_NAMES and ADMIN_PACKET_SERVER_CMD_LOGGING
216 Data provided with these packets is not stable and will not be
217 treated as such. Do not rely on IDs or names to be constant
218 across different versions / revisions of OpenTTD.
219 Data provided in this packet is for logging purposes only.