2 * InspIRCd -- Internet Relay Chat Daemon
4 * Copyright (C) 2009-2010 Daniel De Graaf <danieldg@inspircd.org>
5 * Copyright (C) 2008 Robin Burchell <robin+git@viroteck.net>
6 * Copyright (C) 2007 Dennis Friis <peavey@inspircd.org>
7 * Copyright (C) 2007 Craig Edwards <craigedwards@brainbox.cc>
9 * This file is part of InspIRCd. InspIRCd is free software: you can
10 * redistribute it and/or modify it under the terms of the GNU General Public
11 * License as published by the Free Software Foundation, version 2.
13 * This program is distributed in the hope that it will be useful, but WITHOUT
14 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
15 * FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
18 * You should have received a copy of the GNU General Public License
19 * along with this program. If not, see <http://www.gnu.org/licenses/>.
23 #ifndef M_SPANNINGTREE_TREESOCKET_H
24 #define M_SPANNINGTREE_TREESOCKET_H
33 * The server list in InspIRCd is maintained as two structures
34 * which hold the data in different ways. Most of the time, we
35 * want to very quicky obtain three pieces of information:
37 * (1) The information on a server
38 * (2) The information on the server we must send data through
39 * to actually REACH the server we're after
40 * (3) Potentially, the child/parent objects of this server
42 * The InspIRCd spanning protocol provides easy access to these
43 * by storing the data firstly in a recursive structure, where
44 * each item references its parent item, and a dynamic list
45 * of child items, and another structure which stores the items
46 * hashed, linearly. This means that if we want to find a server
47 * by name quickly, we can look it up in the hash, avoiding
48 * any O(n) lookups. If however, during a split or sync, we want
49 * to apply an operation to a server, and any of its child objects
50 * we can resort to recursion to walk the tree structure.
51 * Any socket can have one of five states at any one time.
53 * CONNECTING: indicates an outbound socket which is
54 * waiting to be writeable.
55 * WAIT_AUTH_1: indicates the socket is outbound and
56 * has successfully connected, but has not
57 * yet sent and received SERVER strings.
58 * WAIT_AUTH_2: indicates that the socket is inbound
59 * but has not yet sent and received
61 * CONNECTED: represents a fully authorized, fully
63 * DYING: represents a server that has had an error.
65 enum ServerState { CONNECTING, WAIT_AUTH_1, WAIT_AUTH_2, CONNECTED, DYING };
69 reference<Link> link; /* Link block used for this connection */
70 reference<Autoconnect> ac; /* Autoconnect used to cause this connection, if any */
71 std::string ModuleList; /* Required module list of other server from CAPAB */
72 std::string OptModuleList; /* Optional module list of other server from CAPAB */
73 std::string ChanModes;
74 std::string UserModes;
75 std::map<std::string,std::string> CapKeys; /* CAPAB keys from other server */
76 std::string ourchallenge; /* Challenge sent for challenge/response */
77 std::string theirchallenge; /* Challenge recv for challenge/response */
78 int capab_phase; /* Have sent CAPAB already */
79 bool auth_fingerprint; /* Did we auth using SSL fingerprint */
80 bool auth_challenge; /* Did we auth using challenge/response */
82 // Data saved from incoming SERVER command, for later use when our credentials have been accepted by the other party
83 std::string description;
89 /** Every SERVER connection inbound or outbound is represented by an object of
90 * type TreeSocket. During setup, the object can be found in Utils->timeoutlist;
91 * after setup, MyRoot will have been created as a child of Utils->TreeRoot
93 class TreeSocket : public BufferedSocket
95 SpanningTreeUtilities* Utils; /* Utility class */
96 std::string linkID; /* Description for this link */
97 ServerState LinkState; /* Link state */
98 CapabData* capab; /* Link setup data (held until burst is sent) */
99 TreeServer* MyRoot; /* The server we are talking to */
100 int proto_version; /* Remote protocol version */
101 bool ConnectionFailureShown; /* Set to true if a connection failure message was shown */
103 /** Checks if the given servername and sid are both free
105 bool CheckDuplicate(const std::string& servername, const std::string& sid);
110 /** Because most of the I/O gubbins are encapsulated within
111 * BufferedSocket, we just call the superclass constructor for
112 * most of the action, and append a few of our own values
115 TreeSocket(SpanningTreeUtilities* Util, Link* link, Autoconnect* myac, const std::string& ipaddr);
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, int newfd, ListenSocket* via, irc::sockets::sockaddrs* client, irc::sockets::sockaddrs* server);
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 Link& link, const std::string &theirs);
147 /** Clean up information used only during server negotiation
149 void CleanNegotiationInfo();
156 /** Construct a password, optionally hashed with the other side's
159 std::string MakePass(const std::string &password, const std::string &challenge);
161 /** When an outbound connection finishes connecting, we receive
162 * this event, and must send our SERVER string to the other
163 * side. If the other side is happy, as outlined in the server
164 * to server docs on the inspircd.org site, the other side
165 * will then send back its own server string.
167 virtual void OnConnected();
169 /** Handle socket error event
171 virtual void OnError(BufferedSocketError e);
173 /** Sends an error to the remote server, and displays it locally to show
176 void SendError(const std::string &errormessage);
178 /** Recursively send the server tree with distances as hops.
179 * This is used during network burst to inform the other server
180 * (and any of ITS servers too) of what servers we know about.
181 * If at any point any of these servers already exist on the other
182 * end, our connection may be terminated. The hopcounts given
183 * by this function are relative, this doesn't matter so long as
184 * they are all >1, as all the remote servers re-calculate them
185 * to be relative too, with themselves as hop 0.
187 void SendServers(TreeServer* Current, TreeServer* s, int hops);
189 /** Returns module list as a string, filtered by filter
190 * @param filter a module version bitmask, such as VF_COMMON or VF_OPTCOMMON
192 std::string MyModules(int filter);
194 /** Send my capabilities to the remote side
196 void SendCapabilities(int phase);
198 /** Add modules to VF_COMMON list for backwards compatability */
199 void CompatAddModules(std::vector<std::string>& modlist);
201 /* Isolate and return the elements that are different between two lists */
202 void ListDifference(const std::string &one, const std::string &two, char sep,
203 std::string& mleft, std::string& mright);
205 bool Capab(const parameterlist ¶ms);
207 /** This function forces this server to quit, removing this server
208 * and any users on it (and servers and users below that, etc etc).
209 * It's very slow and pretty clunky, but luckily unless your network
210 * is having a REAL bad hair day, this function shouldnt be called
211 * too many times a month ;-)
213 void SquitServer(std::string &from, TreeServer* Current, int& num_lost_servers, int& num_lost_users);
215 /** This is a wrapper function for SquitServer above, which
216 * does some validation first and passes on the SQUIT to all
217 * other remaining servers.
219 void Squit(TreeServer* Current, const std::string &reason);
221 /* Used on nick collision ... XXX ugly function HACK */
222 int DoCollision(User *u, time_t remotets, const std::string &remoteident, const std::string &remoteip, const std::string &remoteuid);
224 /** Send one or more FJOINs for a channel of users.
225 * If the length of a single line is more than 480-NICKMAX
226 * in length, it is split over multiple lines.
228 void SendFJoins(Channel* c);
230 /** Send G, Q, Z and E lines */
233 /** Send channel modes and topics */
234 void SendChannelModes();
236 /** send all users and their oper state/modes */
239 /** This function is called when we want to send a netburst to a local
240 * server. There is a set order we must do this, because for example
241 * users require their servers to exist, and channels require their
242 * users to exist. You get the idea.
244 void DoBurst(TreeServer* s);
246 /** This function is called when we receive data from a remote
251 /** Send one or more complete lines down the socket
253 void WriteLine(std::string line);
255 /** Handle ERROR command */
256 void Error(parameterlist ¶ms);
259 bool Away(const std::string &prefix, parameterlist ¶ms);
261 /** SAVE to resolve nick collisions without killing */
262 bool ForceNick(const std::string &prefix, parameterlist ¶ms);
266 void Encap(User* who, parameterlist ¶ms);
270 bool OperQuit(const std::string &prefix, parameterlist ¶ms);
274 bool LocalPong(const std::string &prefix, parameterlist ¶ms);
278 bool ServerVersion(const std::string &prefix, parameterlist ¶ms);
282 bool AddLine(const std::string &prefix, parameterlist ¶ms);
286 bool DelLine(const std::string &prefix, parameterlist ¶ms);
290 bool Whois(const std::string &prefix, parameterlist ¶ms);
294 bool Push(const std::string &prefix, parameterlist ¶ms);
298 bool LocalPing(const std::string &prefix, parameterlist ¶ms);
300 /** <- (remote) <- SERVER
302 bool RemoteServer(const std::string &prefix, parameterlist ¶ms);
304 /** (local) -> SERVER
306 bool Outbound_Reply_Server(parameterlist ¶ms);
308 /** (local) <- SERVER
310 bool Inbound_Server(parameterlist ¶ms);
312 /** Handle IRC line split
314 void Split(const std::string &line, std::string& prefix, std::string& command, parameterlist ¶ms);
316 /** Process complete line from buffer
318 void ProcessLine(std::string &line);
320 void ProcessConnectedLine(std::string& prefix, std::string& command, parameterlist& params);
322 /** Handle socket timeout from connect()
324 virtual void OnTimeout();
325 /** Handle server quit on close
327 virtual void Close();
329 /** Returns true if this server was introduced to the rest of the network