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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 /** Constructor for outgoing connections.
35  * Because most of the I/O gubbins are encapsulated within
36  * BufferedSocket, we just call DoConnect() for most of the action,
37  * and only do minor initialization tasks ourselves.
38  */
39 TreeSocket::TreeSocket(Link* link, Autoconnect* myac, const std::string& ipaddr)
40         : linkID(assign(link->Name)), LinkState(CONNECTING), MyRoot(NULL), proto_version(0)
41         , burstsent(false), 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 /** Constructor for incoming connections
54  */
55 TreeSocket::TreeSocket(int newfd, ListenSocket* via, irc::sockets::sockaddrs* client, irc::sockets::sockaddrs* server)
56         : BufferedSocket(newfd)
57         , linkID("inbound from " + client->addr()), LinkState(WAIT_AUTH_1), MyRoot(NULL), proto_version(0)
58         , burstsent(false), age(ServerInstance->Time())
59 {
60         capab = new CapabData;
61         capab->capab_phase = 0;
62
63         if (via->iohookprov)
64                 via->iohookprov->OnAccept(this, client, server);
65         SendCapabilities(1);
66
67         Utils->timeoutlist[this] = std::pair<std::string, int>(linkID, 30);
68 }
69
70 void TreeSocket::CleanNegotiationInfo()
71 {
72         // connect is good, reset the autoconnect block (if used)
73         if (capab->ac)
74                 capab->ac->position = -1;
75         delete capab;
76         capab = NULL;
77 }
78
79 CullResult TreeSocket::cull()
80 {
81         Utils->timeoutlist.erase(this);
82         if (capab && capab->ac)
83                 Utils->Creator->ConnectServer(capab->ac, false);
84         return this->BufferedSocket::cull();
85 }
86
87 TreeSocket::~TreeSocket()
88 {
89         delete capab;
90 }
91
92 /** When an outbound connection finishes connecting, we receive
93  * this event, and must do CAPAB negotiation with the other
94  * side. If the other side is happy, as outlined in the server
95  * to server docs on the inspircd.org site, the other side
96  * will then send back its own SERVER string eventually.
97  */
98 void TreeSocket::OnConnected()
99 {
100         if (this->LinkState == CONNECTING)
101         {
102                 if (!capab->link->Hook.empty())
103                 {
104                         ServiceProvider* prov = ServerInstance->Modules->FindService(SERVICE_IOHOOK, capab->link->Hook);
105                         if (!prov)
106                         {
107                                 SetError("Could not find hook '" + capab->link->Hook + "' for connection to " + linkID);
108                                 return;
109                         }
110                         static_cast<IOHookProvider*>(prov)->OnConnect(this);
111                 }
112
113                 ServerInstance->SNO->WriteGlobalSno('l', "Connection to \2%s\2[%s] started.", linkID.c_str(),
114                         (capab->link->HiddenFromStats ? "<hidden>" : capab->link->IPAddr.c_str()));
115                 this->SendCapabilities(1);
116         }
117 }
118
119 void TreeSocket::OnError(BufferedSocketError e)
120 {
121         ServerInstance->SNO->WriteGlobalSno('l', "Connection to '\002%s\002' failed with error: %s",
122                 linkID.c_str(), getError().c_str());
123         LinkState = DYING;
124         Close();
125 }
126
127 void TreeSocket::SendError(const std::string &errormessage)
128 {
129         WriteLine("ERROR :"+errormessage);
130         DoWrite();
131         LinkState = DYING;
132         SetError(errormessage);
133 }
134
135 CmdResult CommandSQuit::HandleServer(TreeServer* server, std::vector<std::string>& params)
136 {
137         TreeServer* quitting = Utils->FindServer(params[0]);
138         if (!quitting)
139         {
140                 ServerInstance->Logs->Log(MODNAME, LOG_DEFAULT, "Squit from unknown server");
141                 return CMD_FAILURE;
142         }
143
144         CmdResult ret = CMD_SUCCESS;
145         if (quitting == server)
146         {
147                 ret = CMD_FAILURE;
148                 server = server->GetParent();
149         }
150         else if (quitting->GetParent() != server)
151                 throw ProtocolException("Attempted to SQUIT a non-directly connected server or the parent");
152
153         server->SQuitChild(quitting, params[1]);
154
155         // XXX: Return CMD_FAILURE when servers SQUIT themselves (i.e. :00S SQUIT 00S :Shutting down)
156         // to stop this message from being forwarded.
157         // The squit logic generates a SQUIT message with our sid as the source and sends it to the
158         // remaining servers.
159         return ret;
160 }
161
162 /** This function is called when we receive data from a remote
163  * server.
164  */
165 void TreeSocket::OnDataReady()
166 {
167         Utils->Creator->loopCall = true;
168         std::string line;
169         while (GetNextLine(line))
170         {
171                 std::string::size_type rline = line.find('\r');
172                 if (rline != std::string::npos)
173                         line.erase(rline);
174                 if (line.find('\0') != std::string::npos)
175                 {
176                         SendError("Read null character from socket");
177                         break;
178                 }
179
180                 try
181                 {
182                         ProcessLine(line);
183                 }
184                 catch (CoreException& ex)
185                 {
186                         ServerInstance->Logs->Log(MODNAME, LOG_DEFAULT, "Error while processing: " + line);
187                         ServerInstance->Logs->Log(MODNAME, LOG_DEFAULT, ex.GetReason());
188                         SendError(ex.GetReason() + " - check the log file for details");
189                 }
190
191                 if (!getError().empty())
192                         break;
193         }
194         if (LinkState != CONNECTED && recvq.length() > 4096)
195                 SendError("RecvQ overrun (line too long)");
196         Utils->Creator->loopCall = false;
197 }