1 /* +------------------------------------+
2 * | Inspire Internet Relay Chat Daemon |
3 * +------------------------------------+
5 * InspIRCd: (C) 2002-2007 InspIRCd Development Team
6 * See: http://www.inspircd.org/wiki/index.php/Credits
8 * This program is free but copyrighted software; see
9 * the file COPYING for details.
11 * ---------------------------------------------------
14 #ifndef __TREESOCKET_H__
15 #define __TREESOCKET_H__
17 #include "configreader.h"
21 #include "commands/cmd_whois.h"
22 #include "commands/cmd_stats.h"
27 #include "transport.h"
29 #include "m_spanningtree/utils.h"
32 * The server list in InspIRCd is maintained as two structures
33 * which hold the data in different ways. Most of the time, we
34 * want to very quicky obtain three pieces of information:
36 * (1) The information on a server
37 * (2) The information on the server we must send data through
38 * to actually REACH the server we're after
39 * (3) Potentially, the child/parent objects of this server
41 * The InspIRCd spanning protocol provides easy access to these
42 * by storing the data firstly in a recursive structure, where
43 * each item references its parent item, and a dynamic list
44 * of child items, and another structure which stores the items
45 * hashed, linearly. This means that if we want to find a server
46 * by name quickly, we can look it up in the hash, avoiding
47 * any O(n) lookups. If however, during a split or sync, we want
48 * to apply an operation to a server, and any of its child objects
49 * we can resort to recursion to walk the tree structure.
50 * Any socket can have one of five states at any one time.
51 * The LISTENER state indicates a socket which is listening
52 * for connections. It cannot receive data itself, only incoming
54 * The CONNECTING state indicates an outbound socket which is
55 * waiting to be writeable.
56 * The WAIT_AUTH_1 state indicates the socket is outbound and
57 * has successfully connected, but has not yet sent and received
59 * The WAIT_AUTH_2 state indicates that the socket is inbound
60 * (allocated by a LISTENER) but has not yet sent and received
62 * The CONNECTED state represents a fully authorized, fully
65 enum ServerState { LISTENER, CONNECTING, WAIT_AUTH_1, WAIT_AUTH_2, CONNECTED };
67 /** Every SERVER connection inbound or outbound is represented by
68 * an object of type TreeSocket.
69 * TreeSockets, being inherited from InspSocket, can be tied into
70 * the core socket engine, and we cn therefore receive activity events
71 * for them, just like activex objects on speed. (yes really, that
72 * is a technical term!) Each of these which relates to a locally
73 * connected server is assocated with it, by hooking it onto a
74 * TreeSocket class using its constructor. In this way, we can
75 * maintain a list of servers, some of which are directly connected,
76 * some of which are not.
78 class TreeSocket : public InspSocket
80 SpanningTreeUtilities* Utils; /* Utility class */
81 std::string myhost; /* Canonical hostname */
82 std::string in_buffer; /* Input buffer */
83 ServerState LinkState; /* Link state */
84 std::string InboundServerName; /* Server name sent to us by other side */
85 std::string InboundDescription; /* Server description (GECOS) sent to us by the other side */
86 int num_lost_users; /* Users lost in split */
87 int num_lost_servers; /* Servers lost in split */
88 time_t NextPing; /* Time when we are due to ping this server */
89 bool LastPingWasGood; /* Responded to last ping we sent? */
90 bool bursting; /* True if not finished bursting yet */
91 unsigned int keylength; /* Is this still used? */
92 std::string ModuleList; /* Module list of other server from CAPAB */
93 std::map<std::string,std::string> CapKeys; /* CAPAB keys from other server */
94 Module* Hook; /* I/O hooking module that we're attached to for this socket */
95 std::string ourchallenge; /* Challenge sent for challenge/response */
96 std::string theirchallenge; /* Challenge recv for challenge/response */
97 std::string OutboundPass; /* Outbound password */
99 static std::map<std::string, std::string> warned; /* Server names that have had protocol violation warnings displayed for them */
103 /** Because most of the I/O gubbins are encapsulated within
104 * InspSocket, we just call the superclass constructor for
105 * most of the action, and append a few of our own values
108 TreeSocket(SpanningTreeUtilities* Util, InspIRCd* SI, std::string host, int port, bool listening, unsigned long maxtime, Module* HookMod = NULL);
110 /** Because most of the I/O gubbins are encapsulated within
111 * InspSocket, we just call the superclass constructor for
112 * most of the action, and append a few of our own values
115 TreeSocket(SpanningTreeUtilities* Util, InspIRCd* SI, std::string host, int port, bool listening, unsigned long maxtime, const std::string &ServerName, const std::string &bindto, Module* HookMod = NULL);
117 /** When a listening socket gives us a new file descriptor,
118 * we must associate it with a socket without creating a new
119 * connection. This constructor is used for this purpose.
121 TreeSocket(SpanningTreeUtilities* Util, InspIRCd* SI, int newfd, char* ip, Module* HookMod = NULL);
125 ServerState GetLinkState();
127 /** Get challenge set in our CAPAB for challenge/response
129 const std::string& GetOurChallenge();
131 /** Get challenge set in our CAPAB for challenge/response
133 void SetOurChallenge(const std::string &c);
135 /** Get challenge set in their CAPAB for challenge/response
137 const std::string& GetTheirChallenge();
139 /** Get challenge set in their CAPAB for challenge/response
141 void SetTheirChallenge(const std::string &c);
143 /** Compare two passwords based on authentication scheme
145 bool ComparePass(const std::string &ours, const std::string &theirs);
147 /** Return the module which we are hooking to for I/O encapsulation
155 /** Generate random string used for challenge-response auth
157 std::string RandString(unsigned int length);
159 /** Construct a password, optionally hashed with the other side's
162 std::string MakePass(const std::string &password, const std::string &challenge);
164 /** When an outbound connection finishes connecting, we receive
165 * this event, and must send our SERVER string to the other
166 * side. If the other side is happy, as outlined in the server
167 * to server docs on the inspircd.org site, the other side
168 * will then send back its own server string.
170 virtual bool OnConnected();
172 /** Handle socket error event
174 virtual void OnError(InspSocketError e);
176 /** Sends an error to the remote server, and displays it locally to show
179 void SendError(const std::string &errormessage);
181 /** Handle socket disconnect event
183 virtual int OnDisconnect();
185 /** Recursively send the server tree with distances as hops.
186 * This is used during network burst to inform the other server
187 * (and any of ITS servers too) of what servers we know about.
188 * If at any point any of these servers already exist on the other
189 * end, our connection may be terminated. The hopcounts given
190 * by this function are relative, this doesn't matter so long as
191 * they are all >1, as all the remote servers re-calculate them
192 * to be relative too, with themselves as hop 0.
194 void SendServers(TreeServer* Current, TreeServer* s, int hops);
196 /** Returns my capabilities as a string
198 std::string MyCapabilities();
200 /** Send my capabilities to the remote side
202 void SendCapabilities();
204 /* Check a comma seperated list for an item */
205 bool HasItem(const std::string &list, const std::string &item);
207 /* Isolate and return the elements that are different between two comma seperated lists */
208 std::string ListDifference(const std::string &one, const std::string &two);
210 bool Capab(const std::deque<std::string> ¶ms);
212 /** This function forces this server to quit, removing this server
213 * and any users on it (and servers and users below that, etc etc).
214 * It's very slow and pretty clunky, but luckily unless your network
215 * is having a REAL bad hair day, this function shouldnt be called
216 * too many times a month ;-)
218 void SquitServer(std::string &from, TreeServer* Current);
220 /** This is a wrapper function for SquitServer above, which
221 * does some validation first and passes on the SQUIT to all
222 * other remaining servers.
224 void Squit(TreeServer* Current, const std::string &reason);
226 /** FMODE command - server mode with timestamp checks */
227 bool ForceMode(const std::string &source, std::deque<std::string> ¶ms);
229 /** FTOPIC command */
230 bool ForceTopic(const std::string &source, std::deque<std::string> ¶ms);
232 /** FJOIN, similar to TS6 SJOIN, but not quite. */
233 bool ForceJoin(const std::string &source, std::deque<std::string> ¶ms);
236 bool IntroduceClient(const std::string &source, std::deque<std::string> ¶ms);
238 /** Send one or more FJOINs for a channel of users.
239 * If the length of a single line is more than 480-NICKMAX
240 * in length, it is split over multiple lines.
242 void SendFJoins(TreeServer* Current, chanrec* c);
244 /** Send G, Q, Z and E lines */
245 void SendXLines(TreeServer* Current);
247 /** Send channel modes and topics */
248 void SendChannelModes(TreeServer* Current);
250 /** send all users and their oper state/modes */
251 void SendUsers(TreeServer* Current);
253 /** This function is called when we want to send a netburst to a local
254 * server. There is a set order we must do this, because for example
255 * users require their servers to exist, and channels require their
256 * users to exist. You get the idea.
258 void DoBurst(TreeServer* s);
260 /** This function is called when we receive data from a remote
261 * server. We buffer the data in a std::string (it doesnt stay
262 * there for long), reading using InspSocket::Read() which can
263 * read up to 16 kilobytes in one operation.
265 * IF THIS FUNCTION RETURNS FALSE, THE CORE CLOSES AND DELETES
266 * THE SOCKET OBJECT FOR US.
268 virtual bool OnDataReady();
270 /** Send one or more complete lines down the socket
272 int WriteLine(std::string line);
274 /** Handle ERROR command */
275 bool Error(std::deque<std::string> ¶ms);
277 /** remote MOTD. leet, huh? */
278 bool Motd(const std::string &prefix, std::deque<std::string> ¶ms);
280 /** remote ADMIN. leet, huh? */
281 bool Admin(const std::string &prefix, std::deque<std::string> ¶ms);
283 /** Remote MODULES */
284 bool Modules(const std::string &prefix, std::deque<std::string> ¶ms);
286 bool Stats(const std::string &prefix, std::deque<std::string> ¶ms);
288 /** Because the core won't let users or even SERVERS set +o,
289 * we use the OPERTYPE command to do this.
291 bool OperType(const std::string &prefix, std::deque<std::string> ¶ms);
293 /** Because Andy insists that services-compatible servers must
294 * implement SVSNICK and SVSJOIN, that's exactly what we do :p
296 bool ForceNick(const std::string &prefix, std::deque<std::string> ¶ms);
298 bool OperQuit(const std::string &prefix, std::deque<std::string> ¶ms);
300 /** Remote SQUIT (RSQUIT). Routing works similar to SVSNICK: Route it to the server that the target is connected to locally,
301 * then let that server do the dirty work (squit it!). Example:
302 * A -> B -> C -> D: oper on A squits D, A routes to B, B routes to C, C notices D connected locally, kills it. -- w00t
304 bool RemoteSquit(const std::string &prefix, std::deque<std::string> ¶ms);
308 bool ServiceJoin(const std::string &prefix, std::deque<std::string> ¶ms);
312 bool RemoteRehash(const std::string &prefix, std::deque<std::string> ¶ms);
316 bool RemoteKill(const std::string &prefix, std::deque<std::string> ¶ms);
320 bool LocalPong(const std::string &prefix, std::deque<std::string> ¶ms);
324 bool MetaData(const std::string &prefix, std::deque<std::string> ¶ms);
328 bool ServerVersion(const std::string &prefix, std::deque<std::string> ¶ms);
332 bool ChangeHost(const std::string &prefix, std::deque<std::string> ¶ms);
336 bool AddLine(const std::string &prefix, std::deque<std::string> ¶ms);
340 bool ChangeName(const std::string &prefix, std::deque<std::string> ¶ms);
344 bool Whois(const std::string &prefix, std::deque<std::string> ¶ms);
348 bool Push(const std::string &prefix, std::deque<std::string> ¶ms);
352 bool HandleSetTime(const std::string &prefix, std::deque<std::string> ¶ms);
356 bool Time(const std::string &prefix, std::deque<std::string> ¶ms);
360 bool LocalPing(const std::string &prefix, std::deque<std::string> ¶ms);
362 /** Remove all modes from a channel, including statusmodes (+qaovh etc), simplemodes, parameter modes.
363 * This does not update the timestamp of the target channel, this must be done seperately.
365 bool RemoveStatus(const std::string &prefix, std::deque<std::string> ¶ms);
367 /** <- (remote) <- SERVER
369 bool RemoteServer(const std::string &prefix, std::deque<std::string> ¶ms);
371 /** (local) -> SERVER
373 bool Outbound_Reply_Server(std::deque<std::string> ¶ms);
375 /** (local) <- SERVER
377 bool Inbound_Server(std::deque<std::string> ¶ms);
381 void Split(const std::string &line, std::deque<std::string> &n);
383 /** Process complete line from buffer
385 bool ProcessLine(std::string &line);
387 /** Get this server's name
389 virtual std::string GetName();
391 /** Handle socket timeout from connect()
393 virtual void OnTimeout();
395 /** Handle socket close event
397 virtual void OnClose();
399 /** Handle incoming connection event
401 virtual int OnIncomingConnection(int newsock, char* ip);