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"
26 #include <netinet/tcp.h>
29 ListenSocket::ListenSocket(ConfigTag* tag, const irc::sockets::sockaddrs& bind_to)
32 irc::sockets::satoap(bind_to, bind_addr, bind_port);
33 bind_desc = bind_to.str();
35 fd = socket(bind_to.sa.sa_family, SOCK_STREAM, 0);
41 /* This OS supports IPv6 sockets that can also listen for IPv4
42 * connections. If our address is "*" or empty, enable both v4 and v6 to
43 * allow for simpler configuration on dual-stack hosts. Otherwise, if it
44 * is "::" or an IPv6 address, disable support so that an IPv4 bind will
45 * work on the port (by us or another application).
47 if (bind_to.sa.sa_family == AF_INET6)
49 std::string addr = tag->getString("address");
50 /* This must be >= sizeof(DWORD) on Windows */
51 const int enable = (addr.empty() || addr == "*") ? 0 : 1;
52 /* This must be before bind() */
53 setsockopt(fd, IPPROTO_IPV6, IPV6_V6ONLY, reinterpret_cast<const char *>(&enable), sizeof(enable));
54 // errors ignored intentionally
58 ServerInstance->SE->SetReuse(fd);
59 int rv = ServerInstance->SE->Bind(this->fd, bind_to);
61 rv = ServerInstance->SE->Listen(this->fd, ServerInstance->Config->MaxConn);
63 int timeout = tag->getInt("defer", 0);
66 #if defined TCP_DEFER_ACCEPT
67 setsockopt(fd, IPPROTO_TCP, TCP_DEFER_ACCEPT, &timeout, sizeof(timeout));
68 #elif defined SO_ACCEPTFILTER
69 struct accept_filter_arg afa;
70 memset(&afa, 0, sizeof(afa));
71 strcpy(afa.af_name, "dataready");
72 setsockopt(fd, SOL_SOCKET, SO_ACCEPTFILTER, &afa, sizeof(afa));
79 ServerInstance->SE->Shutdown(this, 2);
80 ServerInstance->SE->Close(this);
86 ServerInstance->SE->NonBlocking(this->fd);
87 ServerInstance->SE->AddFd(this, FD_WANT_POLL_READ | FD_WANT_NO_WRITE);
91 ListenSocket::~ListenSocket()
93 if (this->GetFd() > -1)
95 ServerInstance->SE->DelFd(this);
96 ServerInstance->Logs->Log("SOCKET", LOG_DEBUG, "Shut down listener on fd %d", this->fd);
97 ServerInstance->SE->Shutdown(this, 2);
98 if (ServerInstance->SE->Close(this) != 0)
99 ServerInstance->Logs->Log("SOCKET", LOG_DEBUG, "Failed to cancel listener: %s", strerror(errno));
104 /* Just seperated into another func for tidiness really.. */
105 void ListenSocket::AcceptInternal()
107 irc::sockets::sockaddrs client;
108 irc::sockets::sockaddrs server;
110 socklen_t length = sizeof(client);
111 int incomingSockfd = ServerInstance->SE->Accept(this, &client.sa, &length);
113 ServerInstance->Logs->Log("SOCKET", LOG_DEBUG, "HandleEvent for Listensocket %s nfd=%d", bind_desc.c_str(), incomingSockfd);
114 if (incomingSockfd < 0)
116 ServerInstance->stats->statsRefused++;
120 socklen_t sz = sizeof(server);
121 if (getsockname(incomingSockfd, &server.sa, &sz))
123 ServerInstance->Logs->Log("SOCKET", LOG_DEBUG, "Can't get peername: %s", strerror(errno));
124 irc::sockets::aptosa(bind_addr, bind_port, server);
129 * this is done as a safety check to keep the file descriptors within range of fd_ref_table.
130 * its a pretty big but for the moment valid assumption:
131 * file descriptors are handed out starting at 0, and are recycled as theyre freed.
132 * therefore if there is ever an fd over 65535, 65536 clients must be connected to the
133 * irc server at once (or the irc server otherwise initiating this many connections, files etc)
134 * which for the time being is a physical impossibility (even the largest networks dont have more
135 * than about 10,000 users on ONE server!)
137 if (incomingSockfd >= ServerInstance->SE->GetMaxFds())
139 ServerInstance->Logs->Log("SOCKET", LOG_DEBUG, "Server is full");
140 ServerInstance->SE->Shutdown(incomingSockfd, 2);
141 ServerInstance->SE->Close(incomingSockfd);
142 ServerInstance->stats->statsRefused++;
146 if (client.sa.sa_family == AF_INET6)
149 * This case is the be all and end all patch to catch and nuke 4in6
150 * instead of special-casing shit all over the place and wreaking merry
151 * havoc with crap, instead, we just recreate sockaddr and strip ::ffff: prefix
154 * This is, of course, much improved over the older way of handling this
155 * (pretend it doesn't exist + hack around it -- yes, both were done!)
157 * Big, big thanks to danieldg for his work on this.
160 static const unsigned char prefix4in6[12] = { 0,0,0,0, 0,0,0,0, 0,0,0xFF,0xFF };
161 if (!memcmp(prefix4in6, &client.in6.sin6_addr, 12))
163 // recreate as a sockaddr_in using the IPv4 IP
164 uint16_t sport = client.in6.sin6_port;
165 client.in4.sin_family = AF_INET;
166 client.in4.sin_port = sport;
167 memcpy(&client.in4.sin_addr.s_addr, client.in6.sin6_addr.s6_addr + 12, sizeof(uint32_t));
169 sport = server.in6.sin6_port;
170 server.in4.sin_family = AF_INET;
171 server.in4.sin_port = sport;
172 memcpy(&server.in4.sin_addr.s_addr, server.in6.sin6_addr.s6_addr + 12, sizeof(uint32_t));
176 ServerInstance->SE->NonBlocking(incomingSockfd);
179 FIRST_MOD_RESULT(OnAcceptConnection, res, (incomingSockfd, this, &client, &server));
180 if (res == MOD_RES_PASSTHRU)
182 std::string type = bind_tag->getString("type", "clients");
183 if (type == "clients")
185 ServerInstance->Users->AddUser(incomingSockfd, this, &client, &server);
189 if (res == MOD_RES_ALLOW)
191 ServerInstance->stats->statsAccept++;
195 ServerInstance->stats->statsRefused++;
196 ServerInstance->Logs->Log("SOCKET", LOG_DEFAULT, "Refusing connection on %s - %s",
197 bind_desc.c_str(), res == MOD_RES_DENY ? "Connection refused by module" : "Module for this port not found");
198 ServerInstance->SE->Close(incomingSockfd);
202 void ListenSocket::HandleEvent(EventType e, int err)
207 ServerInstance->Logs->Log("SOCKET", LOG_DEFAULT, "ListenSocket::HandleEvent() received a socket engine error event! well shit! '%s'", strerror(err));
210 ServerInstance->Logs->Log("SOCKET", LOG_DEBUG, "*** BUG *** ListenSocket::HandleEvent() got a WRITE event!!!");
213 this->AcceptInternal();