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Store id in TreeServer, use TreeServer::GetID() to get the id (NOTE: it is std::string)
[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 "inspircd.h"
15 #include "configreader.h"
16 #include "users.h"
17 #include "channels.h"
18 #include "modules.h"
19 #include "commands/cmd_whois.h"
20 #include "commands/cmd_stats.h"
21 #include "socket.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.clear();
35         ServerDesc.clear();
36         VersionString.clear();
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.clear();
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.clear();
69         UserCount = OperCount = 0;
70         this->SetNextPingTime(time(NULL) + Utils->PingFreq);
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 std::string& TreeServer::GetID()
128 {
129         return sid;
130 }
131
132 void TreeServer::SetID(const std::string &id)
133 {
134         sid = id;
135 }
136
137 int TreeServer::QuitUsers(const std::string &reason)
138 {
139         const char* reason_s = reason.c_str();
140         std::vector<userrec*> time_to_die;
141         for (user_hash::iterator n = ServerInstance->clientlist->begin(); n != ServerInstance->clientlist->end(); n++)
142         {
143                 if (!strcmp(n->second->server, this->ServerName.c_str()))
144                 {
145                         time_to_die.push_back(n->second);
146                 }
147         }
148         for (std::vector<userrec*>::iterator n = time_to_die.begin(); n != time_to_die.end(); n++)
149         {
150                 userrec* a = (userrec*)*n;
151                 if (!IS_LOCAL(a))
152                 {
153                         if (ServerInstance->Config->HideSplits)
154                                 userrec::QuitUser(ServerInstance, a, "*.net *.split", reason_s);
155                         else
156                                 userrec::QuitUser(ServerInstance, a, reason_s);
157
158                         if (this->Utils->quiet_bursts)
159                                 ServerInstance->GlobalCulls.MakeSilent(a);
160                 }
161         }
162         return time_to_die.size();
163 }
164
165 /** This method is used to add the structure to the
166  * hash_map for linear searches. It is only called
167  * by the constructors.
168  */
169 void TreeServer::AddHashEntry()
170 {
171         server_hash::iterator iter = Utils->serverlist.find(this->ServerName.c_str());
172         if (iter == Utils->serverlist.end())
173                 Utils->serverlist[this->ServerName.c_str()] = this;
174 }
175
176 /** This method removes the reference to this object
177  * from the hash_map which is used for linear searches.
178  * It is only called by the default destructor.
179  */
180 void TreeServer::DelHashEntry()
181 {
182         server_hash::iterator iter = Utils->serverlist.find(this->ServerName.c_str());
183         if (iter != Utils->serverlist.end())
184                 Utils->serverlist.erase(iter);
185 }
186
187 /** These accessors etc should be pretty self-
188  * explanitory.
189  */
190 TreeServer* TreeServer::GetRoute()
191 {
192         return Route;
193 }
194
195 std::string TreeServer::GetName()
196 {
197         return ServerName.c_str();
198 }
199
200 std::string TreeServer::GetDesc()
201 {
202         return ServerDesc;
203 }
204
205 std::string TreeServer::GetVersion()
206 {
207         return VersionString;
208 }
209
210 void TreeServer::SetNextPingTime(time_t t)
211 {
212         this->NextPing = t;
213         LastPingWasGood = false;
214 }
215
216 time_t TreeServer::NextPingTime()
217 {
218         return NextPing;
219 }
220
221 bool TreeServer::AnsweredLastPing()
222 {
223         return LastPingWasGood;
224 }
225
226 void TreeServer::SetPingFlag()
227 {
228         LastPingWasGood = true;
229 }
230
231 int TreeServer::GetUserCount()
232 {
233         return UserCount;
234 }
235
236 void TreeServer::AddUserCount()
237 {
238         UserCount++;
239 }
240
241 void TreeServer::DelUserCount()
242 {
243         UserCount--;
244 }
245
246 int TreeServer::GetOperCount()
247 {
248         return OperCount;
249 }
250
251 TreeSocket* TreeServer::GetSocket()
252 {
253         return Socket;
254 }
255
256 TreeServer* TreeServer::GetParent()
257 {
258         return Parent;
259 }
260
261 void TreeServer::SetVersion(const std::string &Version)
262 {
263         VersionString = Version;
264 }
265
266 unsigned int TreeServer::ChildCount()
267 {
268         return Children.size();
269 }
270
271 TreeServer* TreeServer::GetChild(unsigned int n)
272 {
273         if (n < Children.size())
274         {
275                 /* Make sure they  cant request
276                  * an out-of-range object. After
277                  * all we know what these programmer
278                  * types are like *grin*.
279                  */
280                 return Children[n];
281         }
282         else
283         {
284                 return NULL;
285         }
286 }
287
288 void TreeServer::AddChild(TreeServer* Child)
289 {
290         Children.push_back(Child);
291 }
292
293 bool TreeServer::DelChild(TreeServer* Child)
294 {
295         for (std::vector<TreeServer*>::iterator a = Children.begin(); a < Children.end(); a++)
296         {
297                 if (*a == Child)
298                 {
299                         Children.erase(a);
300                         return true;
301                 }
302         }
303         return false;
304 }
305
306 /** Removes child nodes of this node, and of that node, etc etc.
307  * This is used during netsplits to automatically tidy up the
308  * server tree. It is slow, we don't use it for much else.
309  */
310 bool TreeServer::Tidy()
311 {
312         bool stillchildren = true;
313         while (stillchildren)
314         {
315                 stillchildren = false;
316                 for (std::vector<TreeServer*>::iterator a = Children.begin(); a < Children.end(); a++)
317                 {
318                         TreeServer* s = (TreeServer*)*a;
319                         s->Tidy();
320                         Children.erase(a);
321                         DELETE(s);
322                         stillchildren = true;
323                         break;
324                 }
325         }
326         return true;
327 }
328
329 TreeServer::~TreeServer()
330 {
331         /* We'd better tidy up after ourselves, eh? */
332         this->DelHashEntry();
333 }
334
335