2 * InspIRCd -- Internet Relay Chat Daemon
4 * Copyright (C) 2009-2010 Daniel De Graaf <danieldg@inspircd.org>
5 * Copyright (C) 2008 Robin Burchell <robin+git@viroteck.net>
7 * This file is part of InspIRCd. InspIRCd is free software: you can
8 * redistribute it and/or modify it under the terms of the GNU General Public
9 * License as published by the Free Software Foundation, version 2.
11 * This program is distributed in the hope that it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
13 * FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
16 * You should have received a copy of the GNU General Public License
17 * along with this program. If not, see <http://www.gnu.org/licenses/>.
23 #include "socketengine.h"
25 ListenSocket::ListenSocket(ConfigTag* tag, const irc::sockets::sockaddrs& bind_to)
28 irc::sockets::satoap(bind_to, bind_addr, bind_port);
29 bind_desc = irc::sockets::satouser(bind_to);
31 fd = socket(bind_to.sa.sa_family, SOCK_STREAM, 0);
36 ServerInstance->SE->SetReuse(fd);
37 int rv = ServerInstance->SE->Bind(this->fd, bind_to);
39 rv = ServerInstance->SE->Listen(this->fd, ServerInstance->Config->MaxConn);
42 /* This OS supports IPv6 sockets that can also listen for IPv4
43 * connections. If our address is "*" or empty, enable both v4 and v6 to
44 * allow for simpler configuration on dual-stack hosts. Otherwise, if it
45 * is "::" or an IPv6 address, disable support so that an IPv4 bind will
46 * work on the port (by us or another application).
48 if (bind_to.sa.sa_family == AF_INET6)
50 std::string addr = tag->getString("address");
51 const char enable = (addr.empty() || addr == "*") ? 0 : 1;
52 setsockopt(fd, IPPROTO_IPV6, IPV6_V6ONLY, &enable, sizeof(enable));
53 // errors ignored intentionally
60 ServerInstance->SE->Shutdown(this, 2);
61 ServerInstance->SE->Close(this);
67 ServerInstance->SE->NonBlocking(this->fd);
68 ServerInstance->SE->AddFd(this, FD_WANT_POLL_READ | FD_WANT_NO_WRITE);
72 ListenSocket::~ListenSocket()
74 if (this->GetFd() > -1)
76 ServerInstance->SE->DelFd(this);
77 ServerInstance->Logs->Log("SOCKET", DEBUG,"Shut down listener on fd %d", this->fd);
78 if (ServerInstance->SE->Shutdown(this, 2) || ServerInstance->SE->Close(this))
79 ServerInstance->Logs->Log("SOCKET", DEBUG,"Failed to cancel listener: %s", strerror(errno));
84 /* Just seperated into another func for tidiness really.. */
85 void ListenSocket::AcceptInternal()
87 irc::sockets::sockaddrs client;
88 irc::sockets::sockaddrs server;
90 socklen_t length = sizeof(client);
91 int incomingSockfd = ServerInstance->SE->Accept(this, &client.sa, &length);
93 ServerInstance->Logs->Log("SOCKET",DEBUG,"HandleEvent for Listensocket %s nfd=%d", bind_desc.c_str(), incomingSockfd);
94 if (incomingSockfd < 0)
96 ServerInstance->stats->statsRefused++;
100 socklen_t sz = sizeof(server);
101 if (getsockname(incomingSockfd, &server.sa, &sz))
103 ServerInstance->Logs->Log("SOCKET", DEBUG, "Can't get peername: %s", strerror(errno));
104 irc::sockets::aptosa(bind_addr, bind_port, server);
109 * this is done as a safety check to keep the file descriptors within range of fd_ref_table.
110 * its a pretty big but for the moment valid assumption:
111 * file descriptors are handed out starting at 0, and are recycled as theyre freed.
112 * therefore if there is ever an fd over 65535, 65536 clients must be connected to the
113 * irc server at once (or the irc server otherwise initiating this many connections, files etc)
114 * which for the time being is a physical impossibility (even the largest networks dont have more
115 * than about 10,000 users on ONE server!)
117 if (incomingSockfd >= ServerInstance->SE->GetMaxFds())
119 ServerInstance->Logs->Log("SOCKET", DEBUG, "Server is full");
120 ServerInstance->SE->Shutdown(incomingSockfd, 2);
121 ServerInstance->SE->Close(incomingSockfd);
122 ServerInstance->stats->statsRefused++;
126 if (client.sa.sa_family == AF_INET6)
129 * This case is the be all and end all patch to catch and nuke 4in6
130 * instead of special-casing shit all over the place and wreaking merry
131 * havoc with crap, instead, we just recreate sockaddr and strip ::ffff: prefix
134 * This is, of course, much improved over the older way of handling this
135 * (pretend it doesn't exist + hack around it -- yes, both were done!)
137 * Big, big thanks to danieldg for his work on this.
140 static const unsigned char prefix4in6[12] = { 0,0,0,0, 0,0,0,0, 0,0,0xFF,0xFF };
141 if (!memcmp(prefix4in6, &client.in6.sin6_addr, 12))
143 // recreate as a sockaddr_in using the IPv4 IP
144 uint16_t sport = client.in6.sin6_port;
145 client.in4.sin_family = AF_INET;
146 client.in4.sin_port = sport;
147 memcpy(&client.in4.sin_addr.s_addr, client.in6.sin6_addr.s6_addr + 12, sizeof(uint32_t));
149 sport = server.in6.sin6_port;
150 server.in4.sin_family = AF_INET;
151 server.in4.sin_port = sport;
152 memcpy(&server.in4.sin_addr.s_addr, server.in6.sin6_addr.s6_addr + 12, sizeof(uint32_t));
156 ServerInstance->SE->NonBlocking(incomingSockfd);
159 FIRST_MOD_RESULT(OnAcceptConnection, res, (incomingSockfd, this, &client, &server));
160 if (res == MOD_RES_PASSTHRU)
162 std::string type = bind_tag->getString("type", "clients");
163 if (type == "clients")
165 ServerInstance->Users->AddUser(incomingSockfd, this, &client, &server);
169 if (res == MOD_RES_ALLOW)
171 ServerInstance->stats->statsAccept++;
175 ServerInstance->stats->statsRefused++;
176 ServerInstance->Logs->Log("SOCKET",DEFAULT,"Refusing connection on %s - %s",
177 bind_desc.c_str(), res == MOD_RES_DENY ? "Connection refused by module" : "Module for this port not found");
178 ServerInstance->SE->Close(incomingSockfd);
182 void ListenSocket::HandleEvent(EventType e, int err)
187 ServerInstance->Logs->Log("SOCKET",DEFAULT,"ListenSocket::HandleEvent() received a socket engine error event! well shit! '%s'", strerror(err));
190 ServerInstance->Logs->Log("SOCKET",DEBUG,"*** BUG *** ListenSocket::HandleEvent() got a WRITE event!!!");
193 this->AcceptInternal();