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[user/henk/code/inspircd.git] / src / modules / m_spanningtree / treeserver.cpp
1 /*       +------------------------------------+
2  *       | Inspire Internet Relay Chat Daemon |
3  *       +------------------------------------+
4  *
5  *  InspIRCd: (C) 2002-2007 InspIRCd Development Team
6  * See: http://www.inspircd.org/wiki/index.php/Credits
7  *
8  * This program is free but copyrighted software; see
9  *            the file COPYING for details.
10  *
11  * ---------------------------------------------------
12  */
13
14 #include "configreader.h"
15 #include "users.h"
16 #include "channels.h"
17 #include "modules.h"
18 #include "commands/cmd_whois.h"
19 #include "commands/cmd_stats.h"
20 #include "socket.h"
21 #include "inspircd.h"
22 #include "wildcard.h"
23 #include "xline.h"
24 #include "transport.h"
25
26 #include "m_spanningtree/utils.h"
27 #include "m_spanningtree/treeserver.h"
28
29 /* $ModDep: m_spanningtree/utils.h m_spanningtree/treeserver.h */
30
31 TreeServer::TreeServer(SpanningTreeUtilities* Util, InspIRCd* Instance) : ServerInstance(Instance), Utils(Util)
32 {
33         Parent = NULL;
34         ServerName = "";
35         ServerDesc = "";
36         VersionString = "";
37         UserCount = OperCount = 0;
38         rtt = LastPing = 0;
39         Hidden = false;
40         VersionString = ServerInstance->GetVersionString();
41 }
42
43 /** We use this constructor only to create the 'root' item, Utils->TreeRoot, which
44  * represents our own server. Therefore, it has no route, no parent, and
45  * no socket associated with it. Its version string is our own local version.
46  */
47 TreeServer::TreeServer(SpanningTreeUtilities* Util, InspIRCd* Instance, std::string Name, std::string Desc) : ServerInstance(Instance), ServerName(Name.c_str()), ServerDesc(Desc), Utils(Util)
48 {
49         Parent = NULL;
50         VersionString = "";
51         UserCount = ServerInstance->UserCount();
52         OperCount = ServerInstance->OperCount();
53         VersionString = ServerInstance->GetVersionString();
54         Route = NULL;
55         Socket = NULL; /* Fix by brain */
56         rtt = LastPing = 0;
57         Hidden = false;
58         AddHashEntry();
59 }
60
61 /** When we create a new server, we call this constructor to initialize it.
62  * This constructor initializes the server's Route and Parent, and sets up
63  * its ping counters so that it will be pinged one minute from now.
64  */
65 TreeServer::TreeServer(SpanningTreeUtilities* Util, InspIRCd* Instance, std::string Name, std::string Desc, TreeServer* Above, TreeSocket* Sock, bool Hide)
66         : ServerInstance(Instance), Parent(Above), ServerName(Name.c_str()), ServerDesc(Desc), Socket(Sock), Utils(Util), Hidden(Hide)
67 {
68         VersionString = "";
69         UserCount = OperCount = 0;
70         this->SetNextPingTime(time(NULL) + 60);
71         this->SetPingFlag();
72         rtt = LastPing = 0;
73         /* find the 'route' for this server (e.g. the one directly connected
74          * to the local server, which we can use to reach it)
75          *
76          * In the following example, consider we have just added a TreeServer
77          * class for server G on our network, of which we are server A.
78          * To route traffic to G (marked with a *) we must send the data to
79          * B (marked with a +) so this algorithm initializes the 'Route'
80          * value to point at whichever server traffic must be routed through
81          * to get here. If we were to try this algorithm with server B,
82          * the Route pointer would point at its own object ('this').
83          *
84          *            A
85          *           / \
86          *        + B   C
87          *         / \   \
88          *        D   E   F
89          *       /         \
90          *    * G           H
91          *
92          * We only run this algorithm when a server is created, as
93          * the routes remain constant while ever the server exists, and
94          * do not need to be re-calculated.
95          */
96
97         Route = Above;
98         if (Route == Utils->TreeRoot)
99         {
100                 Route = this;
101         }
102         else
103         {
104                 while (this->Route->GetParent() != Utils->TreeRoot)
105                 {
106                         this->Route = Route->GetParent();
107                 }
108         }
109
110         /* Because recursive code is slow and takes a lot of resources,
111          * we store two representations of the server tree. The first
112          * is a recursive structure where each server references its
113          * children and its parent, which is used for netbursts and
114          * netsplits to dump the whole dataset to the other server,
115          * and the second is used for very fast lookups when routing
116          * messages and is instead a hash_map, where each item can
117          * be referenced by its server name. The AddHashEntry()
118          * call below automatically inserts each TreeServer class
119          * into the hash_map as it is created. There is a similar
120          * maintainance call in the destructor to tidy up deleted
121          * servers.
122          */
123
124         this->AddHashEntry();
125 }
126
127 int TreeServer::QuitUsers(const std::string &reason)
128 {
129         const char* reason_s = reason.c_str();
130         std::vector<userrec*> time_to_die;
131         for (user_hash::iterator n = ServerInstance->clientlist->begin(); n != ServerInstance->clientlist->end(); n++)
132         {
133                 if (!strcmp(n->second->server, this->ServerName.c_str()))
134                 {
135                         time_to_die.push_back(n->second);
136                 }
137         }
138         for (std::vector<userrec*>::iterator n = time_to_die.begin(); n != time_to_die.end(); n++)
139         {
140                 userrec* a = (userrec*)*n;
141                 if (!IS_LOCAL(a))
142                 {
143                         if (ServerInstance->Config->HideSplits)
144                                 userrec::QuitUser(ServerInstance, a, "*.net *.split", reason_s);
145                         else
146                                 userrec::QuitUser(ServerInstance, a, reason_s);
147                 }
148         }
149         return time_to_die.size();
150 }
151
152 /** This method is used to add the structure to the
153  * hash_map for linear searches. It is only called
154  * by the constructors.
155  */
156 void TreeServer::AddHashEntry()
157 {
158         server_hash::iterator iter = Utils->serverlist.find(this->ServerName.c_str());
159         if (iter == Utils->serverlist.end())
160                 Utils->serverlist[this->ServerName.c_str()] = this;
161 }
162
163 /** This method removes the reference to this object
164  * from the hash_map which is used for linear searches.
165  * It is only called by the default destructor.
166  */
167 void TreeServer::DelHashEntry()
168 {
169         server_hash::iterator iter = Utils->serverlist.find(this->ServerName.c_str());
170         if (iter != Utils->serverlist.end())
171                 Utils->serverlist.erase(iter);
172 }
173
174 /** These accessors etc should be pretty self-
175  * explanitory.
176  */
177 TreeServer* TreeServer::GetRoute()
178 {
179         return Route;
180 }
181
182 std::string TreeServer::GetName()
183 {
184         return ServerName.c_str();
185 }
186
187 std::string TreeServer::GetDesc()
188 {
189         return ServerDesc;
190 }
191
192 std::string TreeServer::GetVersion()
193 {
194         return VersionString;
195 }
196
197 void TreeServer::SetNextPingTime(time_t t)
198 {
199         this->NextPing = t;
200         LastPingWasGood = false;
201 }
202
203 time_t TreeServer::NextPingTime()
204 {
205         return NextPing;
206 }
207
208 bool TreeServer::AnsweredLastPing()
209 {
210         return LastPingWasGood;
211 }
212
213 void TreeServer::SetPingFlag()
214 {
215         LastPingWasGood = true;
216 }
217
218 int TreeServer::GetUserCount()
219 {
220         return UserCount;
221 }
222
223 void TreeServer::AddUserCount()
224 {
225         UserCount++;
226 }
227
228 void TreeServer::DelUserCount()
229 {
230         UserCount--;
231 }
232
233 int TreeServer::GetOperCount()
234 {
235         return OperCount;
236 }
237
238 TreeSocket* TreeServer::GetSocket()
239 {
240         return Socket;
241 }
242
243 TreeServer* TreeServer::GetParent()
244 {
245         return Parent;
246 }
247
248 void TreeServer::SetVersion(const std::string &Version)
249 {
250         VersionString = Version;
251 }
252
253 unsigned int TreeServer::ChildCount()
254 {
255         return Children.size();
256 }
257
258 TreeServer* TreeServer::GetChild(unsigned int n)
259 {
260         if (n < Children.size())
261         {
262                 /* Make sure they  cant request
263                  * an out-of-range object. After
264                  * all we know what these programmer
265                  * types are like *grin*.
266                  */
267                 return Children[n];
268         }
269         else
270         {
271                 return NULL;
272         }
273 }
274
275 void TreeServer::AddChild(TreeServer* Child)
276 {
277         Children.push_back(Child);
278 }
279
280 bool TreeServer::DelChild(TreeServer* Child)
281 {
282         for (std::vector<TreeServer*>::iterator a = Children.begin(); a < Children.end(); a++)
283         {
284                 if (*a == Child)
285                 {
286                         Children.erase(a);
287                         return true;
288                 }
289         }
290         return false;
291 }
292
293 /** Removes child nodes of this node, and of that node, etc etc.
294  * This is used during netsplits to automatically tidy up the
295  * server tree. It is slow, we don't use it for much else.
296  */
297 bool TreeServer::Tidy()
298 {
299         bool stillchildren = true;
300         while (stillchildren)
301         {
302                 stillchildren = false;
303                 for (std::vector<TreeServer*>::iterator a = Children.begin(); a < Children.end(); a++)
304                 {
305                         TreeServer* s = (TreeServer*)*a;
306                         s->Tidy();
307                         Children.erase(a);
308                         DELETE(s);
309                         stillchildren = true;
310                         break;
311                 }
312         }
313         return true;
314 }
315
316 TreeServer::~TreeServer()
317 {
318         /* We'd better tidy up after ourselves, eh? */
319         this->DelHashEntry();
320 }
321
322