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/>.
25 #include <netinet/tcp.h>
28 ListenSocket::ListenSocket(ConfigTag* tag, const irc::sockets::sockaddrs& bind_to)
32 fd = socket(bind_to.family(), SOCK_STREAM, 0);
38 /* This OS supports IPv6 sockets that can also listen for IPv4
39 * connections. If our address is "*" or empty, enable both v4 and v6 to
40 * allow for simpler configuration on dual-stack hosts. Otherwise, if it
41 * is "::" or an IPv6 address, disable support so that an IPv4 bind will
42 * work on the port (by us or another application).
44 if (bind_to.family() == AF_INET6)
46 std::string addr = tag->getString("address");
47 /* This must be >= sizeof(DWORD) on Windows */
48 const int enable = (addr.empty() || addr == "*") ? 0 : 1;
49 /* This must be before bind() */
50 setsockopt(fd, IPPROTO_IPV6, IPV6_V6ONLY, reinterpret_cast<const char *>(&enable), sizeof(enable));
51 // errors ignored intentionally
55 if (tag->getBool("free"))
58 #if defined IP_FREEBIND // Linux 2.4+
59 setsockopt(fd, SOL_IP, IP_FREEBIND, &enable, sizeof(enable));
60 #elif defined IP_BINDANY // FreeBSD
61 setsockopt(fd, IPPROTO_IP, IP_BINDANY, &enable, sizeof(enable));
62 #elif defined SO_BINDANY // NetBSD/OpenBSD
63 setsockopt(fd, SOL_SOCKET, SO_BINDANY, &enable, sizeof(enable));
69 SocketEngine::SetReuse(fd);
70 int rv = SocketEngine::Bind(this->fd, bind_to);
72 rv = SocketEngine::Listen(this->fd, ServerInstance->Config->MaxConn);
74 // Default defer to on for TLS listeners because in TLS the client always speaks first
75 int timeout = tag->getDuration("defer", (tag->getString("ssl").empty() ? 0 : 3));
78 #if defined TCP_DEFER_ACCEPT
79 setsockopt(fd, IPPROTO_TCP, TCP_DEFER_ACCEPT, &timeout, sizeof(timeout));
80 #elif defined SO_ACCEPTFILTER
81 struct accept_filter_arg afa;
82 memset(&afa, 0, sizeof(afa));
83 strcpy(afa.af_name, "dataready");
84 setsockopt(fd, SOL_SOCKET, SO_ACCEPTFILTER, &afa, sizeof(afa));
91 SocketEngine::Shutdown(this, 2);
92 SocketEngine::Close(this->GetFd());
98 SocketEngine::NonBlocking(this->fd);
99 SocketEngine::AddFd(this, FD_WANT_POLL_READ | FD_WANT_NO_WRITE);
101 this->ResetIOHookProvider();
105 ListenSocket::~ListenSocket()
107 if (this->GetFd() > -1)
109 ServerInstance->Logs->Log("SOCKET", LOG_DEBUG, "Shut down listener on fd %d", this->fd);
110 SocketEngine::Shutdown(this, 2);
112 if (SocketEngine::Close(this) != 0)
113 ServerInstance->Logs->Log("SOCKET", LOG_DEBUG, "Failed to cancel listener: %s", strerror(errno));
115 if (bind_sa.family() == AF_UNIX && unlink(bind_sa.un.sun_path))
116 ServerInstance->Logs->Log("SOCKET", LOG_DEBUG, "Failed to unlink UNIX socket: %s", strerror(errno));
120 void ListenSocket::OnEventHandlerRead()
122 irc::sockets::sockaddrs client;
123 irc::sockets::sockaddrs server(bind_sa);
125 socklen_t length = sizeof(client);
126 int incomingSockfd = SocketEngine::Accept(this, &client.sa, &length);
128 ServerInstance->Logs->Log("SOCKET", LOG_DEBUG, "Accepting connection on socket %s fd %d", bind_sa.str().c_str(), incomingSockfd);
129 if (incomingSockfd < 0)
131 ServerInstance->stats.Refused++;
135 socklen_t sz = sizeof(server);
136 if (getsockname(incomingSockfd, &server.sa, &sz))
138 ServerInstance->Logs->Log("SOCKET", LOG_DEBUG, "Can't get peername: %s", strerror(errno));
141 if (client.family() == AF_INET6)
144 * This case is the be all and end all patch to catch and nuke 4in6
145 * instead of special-casing shit all over the place and wreaking merry
146 * havoc with crap, instead, we just recreate sockaddr and strip ::ffff: prefix
149 * This is, of course, much improved over the older way of handling this
150 * (pretend it doesn't exist + hack around it -- yes, both were done!)
152 * Big, big thanks to danieldg for his work on this.
155 static const unsigned char prefix4in6[12] = { 0,0,0,0, 0,0,0,0, 0,0,0xFF,0xFF };
156 if (!memcmp(prefix4in6, &client.in6.sin6_addr, 12))
158 // recreate as a sockaddr_in using the IPv4 IP
159 uint16_t sport = client.in6.sin6_port;
160 client.in4.sin_family = AF_INET;
161 client.in4.sin_port = sport;
162 memcpy(&client.in4.sin_addr.s_addr, client.in6.sin6_addr.s6_addr + 12, sizeof(uint32_t));
164 sport = server.in6.sin6_port;
165 server.in4.sin_family = AF_INET;
166 server.in4.sin_port = sport;
167 memcpy(&server.in4.sin_addr.s_addr, server.in6.sin6_addr.s6_addr + 12, sizeof(uint32_t));
170 else if (client.family() == AF_UNIX)
172 // Clients connecting via UNIX sockets don't have paths so give them
173 // the server path as defined in RFC 1459 section 8.1.1.
175 // strcpy is safe here because sizeof(sockaddr_un.sun_path) is equal on both.
176 strcpy(client.un.sun_path, server.un.sun_path);
179 SocketEngine::NonBlocking(incomingSockfd);
182 FIRST_MOD_RESULT(OnAcceptConnection, res, (incomingSockfd, this, &client, &server));
183 if (res == MOD_RES_PASSTHRU)
185 std::string type = bind_tag->getString("type", "clients");
186 if (stdalgo::string::equalsci(type, "clients"))
188 ServerInstance->Users->AddUser(incomingSockfd, this, &client, &server);
192 if (res == MOD_RES_ALLOW)
194 ServerInstance->stats.Accept++;
198 ServerInstance->stats.Refused++;
199 ServerInstance->Logs->Log("SOCKET", LOG_DEFAULT, "Refusing connection on %s - %s",
200 bind_sa.str().c_str(), res == MOD_RES_DENY ? "Connection refused by module" : "Module for this port not found");
201 SocketEngine::Close(incomingSockfd);
205 void ListenSocket::ResetIOHookProvider()
207 iohookprovs[0].SetProvider(bind_tag->getString("hook"));
209 // Check that all non-last hooks support being in the middle
210 for (IOHookProvList::iterator i = iohookprovs.begin(); i != iohookprovs.end()-1; ++i)
212 IOHookProvRef& curr = *i;
213 // Ignore if cannot be in the middle
214 if ((curr) && (!curr->IsMiddle()))
215 curr.SetProvider(std::string());
218 std::string provname = bind_tag->getString("ssl");
219 if (!provname.empty())
220 provname.insert(0, "ssl/");
222 // SSL should be the last
223 iohookprovs.back().SetProvider(provname);