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m_spanningtree Add function to easily determine whether a server was introduced to...
[user/henk/code/inspircd.git] / src / modules / m_spanningtree / treesocket1.cpp
1 /*
2  * InspIRCd -- Internet Relay Chat Daemon
3  *
4  *   Copyright (C) 2009-2010 Daniel De Graaf <danieldg@inspircd.org>
5  *   Copyright (C) 2007-2008 Robin Burchell <robin+git@viroteck.net>
6  *   Copyright (C) 2007 Craig Edwards <craigedwards@brainbox.cc>
7  *   Copyright (C) 2007 Dennis Friis <peavey@inspircd.org>
8  *
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.
12  *
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
16  * details.
17  *
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/>.
20  */
21
22
23 #include "inspircd.h"
24 #include "socket.h"
25 #include "xline.h"
26 #include "socketengine.h"
27
28 #include "main.h"
29 #include "../spanningtree.h"
30 #include "utils.h"
31 #include "treeserver.h"
32 #include "link.h"
33 #include "treesocket.h"
34 #include "resolvers.h"
35
36 /** Because most of the I/O gubbins are encapsulated within
37  * BufferedSocket, we just call the superclass constructor for
38  * most of the action, and append a few of our own values
39  * to it.
40  */
41 TreeSocket::TreeSocket(SpanningTreeUtilities* Util, Link* link, Autoconnect* myac, const std::string& ipaddr)
42         : Utils(Util)
43 {
44         age = ServerInstance->Time();
45         linkID = assign(link->Name);
46         capab = new CapabData;
47         capab->link = link;
48         capab->ac = myac;
49         capab->capab_phase = 0;
50         MyRoot = NULL;
51         proto_version = 0;
52         LinkState = CONNECTING;
53         if (!link->Hook.empty())
54         {
55                 ServiceProvider* prov = ServerInstance->Modules->FindService(SERVICE_IOHOOK, link->Hook);
56                 if (!prov)
57                 {
58                         SetError("Could not find hook '" + link->Hook + "' for connection to " + linkID);
59                         return;
60                 }
61                 AddIOHook(prov->creator);
62         }
63         DoConnect(ipaddr, link->Port, link->Timeout, link->Bind);
64         Utils->timeoutlist[this] = std::pair<std::string, int>(linkID, link->Timeout);
65         SendCapabilities(1);
66 }
67
68 /** When a listening socket gives us a new file descriptor,
69  * we must associate it with a socket without creating a new
70  * connection. This constructor is used for this purpose.
71  */
72 TreeSocket::TreeSocket(SpanningTreeUtilities* Util, int newfd, ListenSocket* via, irc::sockets::sockaddrs* client, irc::sockets::sockaddrs* server)
73         : BufferedSocket(newfd), Utils(Util)
74 {
75         capab = new CapabData;
76         capab->capab_phase = 0;
77         MyRoot = NULL;
78         age = ServerInstance->Time();
79         LinkState = WAIT_AUTH_1;
80         proto_version = 0;
81         linkID = "inbound from " + client->addr();
82
83         FOREACH_MOD(I_OnHookIO, OnHookIO(this, via));
84         if (GetIOHook())
85                 GetIOHook()->OnStreamSocketAccept(this, client, server);
86         SendCapabilities(1);
87
88         Utils->timeoutlist[this] = std::pair<std::string, int>(linkID, 30);
89 }
90
91 ServerState TreeSocket::GetLinkState()
92 {
93         return this->LinkState;
94 }
95
96 void TreeSocket::CleanNegotiationInfo()
97 {
98         // connect is good, reset the autoconnect block (if used)
99         if (capab->ac)
100                 capab->ac->position = -1;
101         delete capab;
102         capab = NULL;
103 }
104
105 CullResult TreeSocket::cull()
106 {
107         Utils->timeoutlist.erase(this);
108         if (capab && capab->ac)
109                 Utils->Creator->ConnectServer(capab->ac, false);
110         return this->BufferedSocket::cull();
111 }
112
113 TreeSocket::~TreeSocket()
114 {
115         if (capab)
116                 delete capab;
117 }
118
119 /** When an outbound connection finishes connecting, we receive
120  * this event, and must send our SERVER string to the other
121  * side. If the other side is happy, as outlined in the server
122  * to server docs on the inspircd.org site, the other side
123  * will then send back its own server string.
124  */
125 void TreeSocket::OnConnected()
126 {
127         if (this->LinkState == CONNECTING)
128         {
129                 ServerInstance->SNO->WriteGlobalSno('l', "Connection to \2%s\2[%s] started.", linkID.c_str(),
130                         (capab->link->HiddenFromStats ? "<hidden>" : capab->link->IPAddr.c_str()));
131                 this->SendCapabilities(1);
132         }
133 }
134
135 void TreeSocket::OnError(BufferedSocketError e)
136 {
137         ServerInstance->SNO->WriteGlobalSno('l', "Connection to \002%s\002 failed with error: %s",
138                 linkID.c_str(), getError().c_str());
139         LinkState = DYING;
140 }
141
142 void TreeSocket::SendError(const std::string &errormessage)
143 {
144         WriteLine("ERROR :"+errormessage);
145         DoWrite();
146         LinkState = DYING;
147         SetError(errormessage);
148 }
149
150 /** This function forces this server to quit, removing this server
151  * and any users on it (and servers and users below that, etc etc).
152  * It's very slow and pretty clunky, but luckily unless your network
153  * is having a REAL bad hair day, this function shouldnt be called
154  * too many times a month ;-)
155  */
156 void TreeSocket::SquitServer(std::string &from, TreeServer* Current, int& num_lost_servers, int& num_lost_users)
157 {
158         ServerInstance->Logs->Log("m_spanningtree",DEBUG,"SquitServer for %s from %s",
159                 Current->GetName().c_str(), from.c_str());
160         /* recursively squit the servers attached to 'Current'.
161          * We're going backwards so we don't remove users
162          * while we still need them ;)
163          */
164         for (unsigned int q = 0; q < Current->ChildCount(); q++)
165         {
166                 TreeServer* recursive_server = Current->GetChild(q);
167                 this->SquitServer(from,recursive_server, num_lost_servers, num_lost_users);
168         }
169         /* Now we've whacked the kids, whack self */
170         num_lost_servers++;
171         num_lost_users += Current->QuitUsers(from);
172 }
173
174 /** This is a wrapper function for SquitServer above, which
175  * does some validation first and passes on the SQUIT to all
176  * other remaining servers.
177  */
178 void TreeSocket::Squit(TreeServer* Current, const std::string &reason)
179 {
180         bool LocalSquit = false;
181
182         if ((Current) && (Current != Utils->TreeRoot))
183         {
184                 DelServerEvent(Utils->Creator, Current->GetName());
185
186                 if (!Current->GetSocket() || Current->GetSocket()->Introduced())
187                 {
188                         parameterlist params;
189                         params.push_back(Current->GetName());
190                         params.push_back(":"+reason);
191                         Utils->DoOneToAllButSender(Current->GetParent()->GetName(),"SQUIT",params,Current->GetName());
192                 }
193
194                 if (Current->GetParent() == Utils->TreeRoot)
195                 {
196                         ServerInstance->SNO->WriteGlobalSno('l', "Server \002"+Current->GetName()+"\002 split: "+reason);
197                         LocalSquit = true;
198                 }
199                 else
200                 {
201                         ServerInstance->SNO->WriteGlobalSno('L', "Server \002"+Current->GetName()+"\002 split from server \002"+Current->GetParent()->GetName()+"\002 with reason: "+reason);
202                 }
203                 int num_lost_servers = 0;
204                 int num_lost_users = 0;
205                 std::string from = Current->GetParent()->GetName()+" "+Current->GetName();
206                 SquitServer(from, Current, num_lost_servers, num_lost_users);
207                 ServerInstance->SNO->WriteToSnoMask(LocalSquit ? 'l' : 'L', "Netsplit complete, lost \002%d\002 user%s on \002%d\002 server%s.",
208                         num_lost_users, num_lost_users != 1 ? "s" : "", num_lost_servers, num_lost_servers != 1 ? "s" : "");
209                 Current->Tidy();
210                 Current->GetParent()->DelChild(Current);
211                 Current->cull();
212                 delete Current;
213                 if (Current == MyRoot)
214                 {
215                         MyRoot = NULL;
216                         Close();
217                 }
218         }
219         else
220                 ServerInstance->Logs->Log("m_spanningtree",DEFAULT,"Squit from unknown server");
221 }
222
223 /** This function is called when we receive data from a remote
224  * server.
225  */
226 void TreeSocket::OnDataReady()
227 {
228         Utils->Creator->loopCall = true;
229         std::string line;
230         while (GetNextLine(line))
231         {
232                 std::string::size_type rline = line.find('\r');
233                 if (rline != std::string::npos)
234                         line = line.substr(0,rline);
235                 if (line.find('\0') != std::string::npos)
236                 {
237                         SendError("Read null character from socket");
238                         break;
239                 }
240                 ProcessLine(line);
241                 if (!getError().empty())
242                         break;
243         }
244         if (LinkState != CONNECTED && recvq.length() > 4096)
245                 SendError("RecvQ overrun (line too long)");
246         Utils->Creator->loopCall = false;
247 }
248
249 bool TreeSocket::Introduced()
250 {
251         return (capab == NULL);
252 }