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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 "iohook.h"
25
26 #include "main.h"
27 #include "modules/spanningtree.h"
28 #include "utils.h"
29 #include "treeserver.h"
30 #include "link.h"
31 #include "treesocket.h"
32 #include "commands.h"
33
34 /** Because most of the I/O gubbins are encapsulated within
35  * BufferedSocket, we just call the superclass constructor for
36  * most of the action, and append a few of our own values
37  * to it.
38  */
39 TreeSocket::TreeSocket(Link* link, Autoconnect* myac, const std::string& ipaddr)
40         : linkID(assign(link->Name)), LinkState(CONNECTING), MyRoot(NULL), proto_version(0), ConnectionFailureShown(false)
41         , age(ServerInstance->Time())
42 {
43         capab = new CapabData;
44         capab->link = link;
45         capab->ac = myac;
46         capab->capab_phase = 0;
47
48         DoConnect(ipaddr, link->Port, link->Timeout, link->Bind);
49         Utils->timeoutlist[this] = std::pair<std::string, int>(linkID, link->Timeout);
50         SendCapabilities(1);
51 }
52
53 /** When a listening socket gives us a new file descriptor,
54  * we must associate it with a socket without creating a new
55  * connection. This constructor is used for this purpose.
56  */
57 TreeSocket::TreeSocket(int newfd, ListenSocket* via, irc::sockets::sockaddrs* client, irc::sockets::sockaddrs* server)
58         : BufferedSocket(newfd)
59         , linkID("inbound from " + client->addr()), LinkState(WAIT_AUTH_1), MyRoot(NULL), proto_version(0)
60         , ConnectionFailureShown(false), age(ServerInstance->Time())
61 {
62         capab = new CapabData;
63         capab->capab_phase = 0;
64
65         if (via->iohookprov)
66                 via->iohookprov->OnAccept(this, client, server);
67         SendCapabilities(1);
68
69         Utils->timeoutlist[this] = std::pair<std::string, int>(linkID, 30);
70 }
71
72 ServerState TreeSocket::GetLinkState()
73 {
74         return this->LinkState;
75 }
76
77 void TreeSocket::CleanNegotiationInfo()
78 {
79         // connect is good, reset the autoconnect block (if used)
80         if (capab->ac)
81                 capab->ac->position = -1;
82         delete capab;
83         capab = NULL;
84 }
85
86 CullResult TreeSocket::cull()
87 {
88         Utils->timeoutlist.erase(this);
89         if (capab && capab->ac)
90                 Utils->Creator->ConnectServer(capab->ac, false);
91         return this->BufferedSocket::cull();
92 }
93
94 TreeSocket::~TreeSocket()
95 {
96         delete capab;
97 }
98
99 /** When an outbound connection finishes connecting, we receive
100  * this event, and must send our SERVER string to the other
101  * side. If the other side is happy, as outlined in the server
102  * to server docs on the inspircd.org site, the other side
103  * will then send back its own server string.
104  */
105 void TreeSocket::OnConnected()
106 {
107         if (this->LinkState == CONNECTING)
108         {
109                 if (!capab->link->Hook.empty())
110                 {
111                         ServiceProvider* prov = ServerInstance->Modules->FindService(SERVICE_IOHOOK, capab->link->Hook);
112                         if (!prov)
113                         {
114                                 SetError("Could not find hook '" + capab->link->Hook + "' for connection to " + linkID);
115                                 return;
116                         }
117                         static_cast<IOHookProvider*>(prov)->OnConnect(this);
118                 }
119
120                 ServerInstance->SNO->WriteGlobalSno('l', "Connection to \2%s\2[%s] started.", linkID.c_str(),
121                         (capab->link->HiddenFromStats ? "<hidden>" : capab->link->IPAddr.c_str()));
122                 this->SendCapabilities(1);
123         }
124 }
125
126 void TreeSocket::OnError(BufferedSocketError e)
127 {
128         ServerInstance->SNO->WriteGlobalSno('l', "Connection to '\002%s\002' failed with error: %s",
129                 linkID.c_str(), getError().c_str());
130         LinkState = DYING;
131 }
132
133 void TreeSocket::SendError(const std::string &errormessage)
134 {
135         WriteLine("ERROR :"+errormessage);
136         DoWrite();
137         LinkState = DYING;
138         SetError(errormessage);
139 }
140
141 /** This function forces this server to quit, removing this server
142  * and any users on it (and servers and users below that, etc etc).
143  * It's very slow and pretty clunky, but luckily unless your network
144  * is having a REAL bad hair day, this function shouldnt be called
145  * too many times a month ;-)
146  */
147 void TreeSocket::SquitServer(std::string &from, TreeServer* Current, int& num_lost_servers, int& num_lost_users)
148 {
149         ServerInstance->Logs->Log(MODNAME, LOG_DEBUG, "SquitServer for %s from %s", Current->GetName().c_str(), from.c_str());
150         /* recursively squit the servers attached to 'Current'.
151          * We're going backwards so we don't remove users
152          * while we still need them ;)
153          */
154         const TreeServer::ChildServers& children = Current->GetChildren();
155         for (TreeServer::ChildServers::const_iterator i = children.begin(); i != children.end(); ++i)
156         {
157                 TreeServer* recursive_server = *i;
158                 this->SquitServer(from,recursive_server, num_lost_servers, num_lost_users);
159         }
160         /* Now we've whacked the kids, whack self */
161         num_lost_servers++;
162         num_lost_users += Current->QuitUsers(from);
163 }
164
165 /** This is a wrapper function for SquitServer above, which
166  * does some validation first and passes on the SQUIT to all
167  * other remaining servers.
168  */
169 void TreeSocket::Squit(TreeServer* Current, const std::string &reason)
170 {
171         bool LocalSquit = false;
172
173         if (!Current->IsRoot())
174         {
175                 DelServerEvent(Utils->Creator, Current->GetName());
176
177                 if (Current->IsLocal())
178                 {
179                         ServerInstance->SNO->WriteGlobalSno('l', "Server \002"+Current->GetName()+"\002 split: "+reason);
180                         LocalSquit = true;
181                         if (Current->GetSocket()->Introduced())
182                         {
183                                 CmdBuilder params("SQUIT");
184                                 params.push_back(Current->GetID());
185                                 params.push_last(reason);
186                                 params.Broadcast();
187                         }
188                 }
189                 else
190                 {
191                         ServerInstance->SNO->WriteGlobalSno('L', "Server \002"+Current->GetName()+"\002 split from server \002"+Current->GetParent()->GetName()+"\002 with reason: "+reason);
192                 }
193                 int num_lost_servers = 0;
194                 int num_lost_users = 0;
195                 std::string from = Current->GetParent()->GetName()+" "+Current->GetName();
196
197                 ModuleSpanningTree* st = Utils->Creator;
198                 st->SplitInProgress = true;
199                 SquitServer(from, Current, num_lost_servers, num_lost_users);
200                 st->SplitInProgress = false;
201
202                 ServerInstance->SNO->WriteToSnoMask(LocalSquit ? 'l' : 'L', "Netsplit complete, lost \002%d\002 user%s on \002%d\002 server%s.",
203                         num_lost_users, num_lost_users != 1 ? "s" : "", num_lost_servers, num_lost_servers != 1 ? "s" : "");
204                 Current->Tidy();
205                 Current->GetParent()->DelChild(Current);
206                 Current->cull();
207                 delete Current;
208                 if (Current == MyRoot)
209                 {
210                         MyRoot = NULL;
211                         Close();
212                 }
213         }
214 }
215
216 CmdResult CommandSQuit::HandleServer(TreeServer* server, std::vector<std::string>& params)
217 {
218         TreeServer* quitting = Utils->FindServer(params[0]);
219         if (!quitting)
220         {
221                 ServerInstance->Logs->Log(MODNAME, LOG_DEFAULT, "Squit from unknown server");
222                 return CMD_FAILURE;
223         }
224
225         TreeSocket* sock = server->GetSocket();
226         sock->Squit(quitting, params[1]);
227
228         // XXX: Return CMD_FAILURE when servers SQUIT themselves (i.e. :00S SQUIT 00S :Shutting down)
229         // to avoid RouteCommand() being called. RouteCommand() requires a valid command source but we
230         // do not have one because the server user is deleted when its TreeServer is destructed.
231         // We generate a SQUIT in TreeSocket::Squit(), with our sid as the source and send it to the
232         // remaining servers.
233         return ((quitting == server) ? CMD_FAILURE : CMD_SUCCESS);
234 }
235
236 /** This function is called when we receive data from a remote
237  * server.
238  */
239 void TreeSocket::OnDataReady()
240 {
241         Utils->Creator->loopCall = true;
242         std::string line;
243         while (GetNextLine(line))
244         {
245                 std::string::size_type rline = line.find('\r');
246                 if (rline != std::string::npos)
247                         line = line.substr(0,rline);
248                 if (line.find('\0') != std::string::npos)
249                 {
250                         SendError("Read null character from socket");
251                         break;
252                 }
253                 ProcessLine(line);
254                 if (!getError().empty())
255                         break;
256         }
257         if (LinkState != CONNECTED && recvq.length() > 4096)
258                 SendError("RecvQ overrun (line too long)");
259         Utils->Creator->loopCall = false;
260 }
261
262 bool TreeSocket::Introduced()
263 {
264         return (capab == NULL);
265 }