1 /* +------------------------------------+
2 * | Inspire Internet Relay Chat Daemon |
3 * +------------------------------------+
5 * InspIRCd: (C) 2002-2009 InspIRCd Development Team
6 * See: http://wiki.inspircd.org/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__
20 #include "../transport.h"
23 #include "handshaketimer.h"
26 * The server list in InspIRCd is maintained as two structures
27 * which hold the data in different ways. Most of the time, we
28 * want to very quicky obtain three pieces of information:
30 * (1) The information on a server
31 * (2) The information on the server we must send data through
32 * to actually REACH the server we're after
33 * (3) Potentially, the child/parent objects of this server
35 * The InspIRCd spanning protocol provides easy access to these
36 * by storing the data firstly in a recursive structure, where
37 * each item references its parent item, and a dynamic list
38 * of child items, and another structure which stores the items
39 * hashed, linearly. This means that if we want to find a server
40 * by name quickly, we can look it up in the hash, avoiding
41 * any O(n) lookups. If however, during a split or sync, we want
42 * to apply an operation to a server, and any of its child objects
43 * we can resort to recursion to walk the tree structure.
44 * Any socket can have one of five states at any one time.
46 * CONNECTING: indicates an outbound socket which is
47 * waiting to be writeable.
48 * WAIT_AUTH_1: indicates the socket is outbound and
49 * has successfully connected, but has not
50 * yet sent and received SERVER strings.
51 * WAIT_AUTH_2: indicates that the socket is inbound
52 * but has not yet sent and received
54 * CONNECTED: represents a fully authorized, fully
57 enum ServerState { CONNECTING, WAIT_AUTH_1, WAIT_AUTH_2, CONNECTED };
59 /** Every SERVER connection inbound or outbound is represented by
60 * an object of type TreeSocket.
61 * TreeSockets, being inherited from BufferedSocket, can be tied into
62 * the core socket engine, and we cn therefore receive activity events
63 * for them, just like activex objects on speed. (yes really, that
64 * is a technical term!) Each of these which relates to a locally
65 * connected server is assocated with it, by hooking it onto a
66 * TreeSocket class using its constructor. In this way, we can
67 * maintain a list of servers, some of which are directly connected,
68 * some of which are not.
70 class TreeSocket : public BufferedSocket
72 SpanningTreeUtilities* Utils; /* Utility class */
73 std::string myhost; /* Canonical hostname */
74 ServerState LinkState; /* Link state */
75 std::string InboundServerName; /* Server name sent to us by other side */
76 std::string InboundDescription; /* Server description (GECOS) sent to us by the other side */
77 std::string InboundSID; /* Server ID sent to us by the other side */
78 int num_lost_users; /* Users lost in split */
79 int num_lost_servers; /* Servers lost in split */
80 time_t NextPing; /* Time when we are due to ping this server */
81 bool LastPingWasGood; /* Responded to last ping we sent? */
83 std::string ModuleList; /* Required module list of other server from CAPAB */
84 std::string OptModuleList; /* Optional module list of other server from CAPAB */
85 std::map<std::string,std::string> CapKeys; /* CAPAB keys from other server */
86 std::string ourchallenge; /* Challenge sent for challenge/response */
87 std::string theirchallenge; /* Challenge recv for challenge/response */
88 std::string OutboundPass; /* Outbound password */
89 int capab_phase; /* Have sent CAPAB already */
90 bool auth_fingerprint; /* Did we auth using SSL fingerprint */
91 bool auth_challenge; /* Did we auth using challenge/response */
92 int proto_version; /* Remote protocol version */
94 HandshakeTimer* hstimer; /* Handshake timer, needed to work around I/O hook buffering */
95 reference<Autoconnect> myautoconnect; /* Autoconnect used to cause this connection, if any */
98 /** Because most of the I/O gubbins are encapsulated within
99 * BufferedSocket, we just call the superclass constructor for
100 * most of the action, and append a few of our own values
103 TreeSocket(SpanningTreeUtilities* Util, std::string host, int port, unsigned long maxtime, const std::string &ServerName, const std::string &bindto, Autoconnect* myac, Module* HookMod = NULL);
105 /** When a listening socket gives us a new file descriptor,
106 * we must associate it with a socket without creating a new
107 * connection. This constructor is used for this purpose.
109 TreeSocket(SpanningTreeUtilities* Util, int newfd, char* ip, Autoconnect* myac, Module* HookMod = NULL);
113 ServerState GetLinkState();
115 /** Get challenge set in our CAPAB for challenge/response
117 const std::string& GetOurChallenge();
119 /** Get challenge set in our CAPAB for challenge/response
121 void SetOurChallenge(const std::string &c);
123 /** Get challenge set in their CAPAB for challenge/response
125 const std::string& GetTheirChallenge();
127 /** Get challenge set in their CAPAB for challenge/response
129 void SetTheirChallenge(const std::string &c);
131 /** Compare two passwords based on authentication scheme
133 bool ComparePass(const Link& link, const std::string &theirs);
135 /** Clean up information used only during server negotiation
137 void CleanNegotiationInfo();
144 /** Generate random string used for challenge-response auth
146 std::string RandString(unsigned int length);
148 /** Construct a password, optionally hashed with the other side's
151 std::string MakePass(const std::string &password, const std::string &challenge);
153 /** When an outbound connection finishes connecting, we receive
154 * this event, and must send our SERVER string to the other
155 * side. If the other side is happy, as outlined in the server
156 * to server docs on the inspircd.org site, the other side
157 * will then send back its own server string.
159 virtual void OnConnected();
161 /** Handle socket error event
163 virtual void OnError(BufferedSocketError e);
165 /** Sends an error to the remote server, and displays it locally to show
168 void SendError(const std::string &errormessage);
170 /** Recursively send the server tree with distances as hops.
171 * This is used during network burst to inform the other server
172 * (and any of ITS servers too) of what servers we know about.
173 * If at any point any of these servers already exist on the other
174 * end, our connection may be terminated. The hopcounts given
175 * by this function are relative, this doesn't matter so long as
176 * they are all >1, as all the remote servers re-calculate them
177 * to be relative too, with themselves as hop 0.
179 void SendServers(TreeServer* Current, TreeServer* s, int hops);
181 /** Returns module list as a string, filtered by filter
182 * @param filter a module version bitmask, such as VF_COMMON or VF_OPTCOMMON
184 std::string MyModules(int filter);
186 /** Send my capabilities to the remote side
188 void SendCapabilities(int phase);
190 /** Add modules to VF_COMMON list for backwards compatability */
191 void CompatAddModules(std::vector<std::string>& modlist);
193 /* Check a comma seperated list for an item */
194 bool HasItem(const std::string &list, const std::string &item);
196 /* Isolate and return the elements that are different between two comma seperated lists */
197 std::string ListDifference(const std::string &one, const std::string &two);
199 bool Capab(const parameterlist ¶ms);
201 /** This function forces this server to quit, removing this server
202 * and any users on it (and servers and users below that, etc etc).
203 * It's very slow and pretty clunky, but luckily unless your network
204 * is having a REAL bad hair day, this function shouldnt be called
205 * too many times a month ;-)
207 void SquitServer(std::string &from, TreeServer* Current);
209 /** This is a wrapper function for SquitServer above, which
210 * does some validation first and passes on the SQUIT to all
211 * other remaining servers.
213 void Squit(TreeServer* Current, const std::string &reason);
215 /** FMODE command - server mode with timestamp checks */
216 bool ForceMode(const std::string &source, parameterlist ¶ms);
218 /** FTOPIC command */
219 bool ForceTopic(const std::string &source, parameterlist ¶ms);
221 /** FJOIN, similar to TS6 SJOIN, but not quite. */
222 bool ForceJoin(const std::string &source, parameterlist ¶ms);
224 /* Used on nick collision ... XXX ugly function HACK */
225 int DoCollision(User *u, time_t remotets, const std::string &remoteident, const std::string &remoteip, const std::string &remoteuid);
228 bool ParseUID(const std::string &source, parameterlist ¶ms);
230 /** Send one or more FJOINs for a channel of users.
231 * If the length of a single line is more than 480-NICKMAX
232 * in length, it is split over multiple lines.
234 void SendFJoins(TreeServer* Current, Channel* c);
236 /** Send G, Q, Z and E lines */
237 void SendXLines(TreeServer* Current);
239 /** Send channel modes and topics */
240 void SendChannelModes(TreeServer* Current);
242 /** send all users and their oper state/modes */
243 void SendUsers(TreeServer* Current);
245 /** This function is called when we want to send a netburst to a local
246 * server. There is a set order we must do this, because for example
247 * users require their servers to exist, and channels require their
248 * users to exist. You get the idea.
250 void DoBurst(TreeServer* s);
252 /** This function is called when we receive data from a remote
257 /** Send one or more complete lines down the socket
259 void WriteLine(std::string line);
261 /** Handle ERROR command */
262 bool Error(parameterlist ¶ms);
265 bool Motd(const std::string &prefix, parameterlist ¶ms);
268 bool Admin(const std::string &prefix, parameterlist ¶ms);
270 bool Stats(const std::string &prefix, parameterlist ¶ms);
272 /** Because the core won't let users or even SERVERS set +o,
273 * we use the OPERTYPE command to do this.
275 bool OperType(const std::string &prefix, parameterlist ¶ms);
278 bool Away(const std::string &prefix, parameterlist ¶ms);
280 /** Because Andy insists that services-compatible servers must
281 * implement SVSNICK and SVSJOIN, that's exactly what we do :p
283 bool SVSNick(const std::string &prefix, parameterlist ¶ms);
285 /** SAVE to resolve nick collisions without killing */
286 bool ForceNick(const std::string &prefix, parameterlist ¶ms);
290 bool Encap(const std::string &prefix, parameterlist ¶ms);
294 bool OperQuit(const std::string &prefix, parameterlist ¶ms);
298 bool ServiceJoin(const std::string &prefix, parameterlist ¶ms);
302 bool ServicePart(const std::string &prefix, parameterlist ¶ms);
306 bool RemoteKill(const std::string &prefix, parameterlist ¶ms);
310 bool LocalPong(const std::string &prefix, parameterlist ¶ms);
314 bool MetaData(const std::string &prefix, parameterlist ¶ms);
318 bool ServerVersion(const std::string &prefix, parameterlist ¶ms);
322 bool ChangeHost(const std::string &prefix, parameterlist ¶ms);
326 bool AddLine(const std::string &prefix, parameterlist ¶ms);
330 bool DelLine(const std::string &prefix, parameterlist ¶ms);
334 bool ChangeName(const std::string &prefix, parameterlist ¶ms);
337 bool ChangeIdent(const std::string &prefix, parameterlist ¶ms);
341 bool Whois(const std::string &prefix, parameterlist ¶ms);
345 bool Push(const std::string &prefix, parameterlist ¶ms);
349 bool Time(const std::string &prefix, parameterlist ¶ms);
353 bool LocalPing(const std::string &prefix, parameterlist ¶ms);
355 /** Remove all modes from a channel, including statusmodes (+qaovh etc), simplemodes, parameter modes.
356 * This does not update the timestamp of the target channel, this must be done seperately.
358 bool RemoveStatus(const std::string &prefix, parameterlist ¶ms);
360 /** <- (remote) <- SERVER
362 bool RemoteServer(const std::string &prefix, parameterlist ¶ms);
364 /** (local) -> SERVER
366 bool Outbound_Reply_Server(parameterlist ¶ms);
368 /** (local) <- SERVER
370 bool Inbound_Server(parameterlist ¶ms);
372 /** Handle IRC line split
374 void Split(const std::string &line, std::string& prefix, std::string& command, parameterlist ¶ms);
376 /** Process complete line from buffer
378 void ProcessLine(std::string &line);
380 void ProcessConnectedLine(std::string& prefix, std::string& command, parameterlist& params);
382 /** Get this server's name
384 virtual std::string GetName();
386 /** Handle socket timeout from connect()
388 virtual void OnTimeout();
389 /** Handle server quit on close
391 virtual void Close();
394 /* Used to validate the value lengths of multiple parameters for a command */
395 struct cmd_validation
402 /* Used to validate the length values in CAPAB CAPABILITIES */
403 struct cap_validation