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/*
* InspIRCd -- Internet Relay Chat Daemon
*
* Copyright (C) 2009-2010 Daniel De Graaf <danieldg@inspircd.org>
* Copyright (C) 2008 Robin Burchell <robin+git@viroteck.net>
*
* This file is part of InspIRCd. InspIRCd is free software: you can
* redistribute it and/or modify it under the terms of the GNU General Public
* License as published by the Free Software Foundation, version 2.
*
* This program is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
* FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
* details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "inspircd.h"
#include "socket.h"
#include "socketengine.h"
ListenSocket::ListenSocket(ConfigTag* tag, const irc::sockets::sockaddrs& bind_to)
: bind_tag(tag)
{
irc::sockets::satoap(bind_to, bind_addr, bind_port);
bind_desc = irc::sockets::satouser(bind_to);
fd = socket(bind_to.sa.sa_family, SOCK_STREAM, 0);
if (this->fd == -1)
return;
ServerInstance->SE->SetReuse(fd);
int rv = ServerInstance->SE->Bind(this->fd, bind_to);
if (rv >= 0)
rv = ServerInstance->SE->Listen(this->fd, ServerInstance->Config->MaxConn);
#ifdef IPV6_V6ONLY
/* This OS supports IPv6 sockets that can also listen for IPv4
* connections. If our address is "*" or empty, enable both v4 and v6 to
* allow for simpler configuration on dual-stack hosts. Otherwise, if it
* is "::" or an IPv6 address, disable support so that an IPv4 bind will
* work on the port (by us or another application).
*/
if (bind_to.sa.sa_family == AF_INET6)
{
std::string addr = tag->getString("address");
const char enable = (addr.empty() || addr == "*") ? 0 : 1;
setsockopt(fd, IPPROTO_IPV6, IPV6_V6ONLY, &enable, sizeof(enable));
// errors ignored intentionally
}
#endif
if (rv < 0)
{
int errstore = errno;
ServerInstance->SE->Shutdown(this, 2);
ServerInstance->SE->Close(this);
this->fd = -1;
errno = errstore;
}
else
{
ServerInstance->SE->NonBlocking(this->fd);
ServerInstance->SE->AddFd(this, FD_WANT_POLL_READ | FD_WANT_NO_WRITE);
}
}
ListenSocket::~ListenSocket()
{
if (this->GetFd() > -1)
{
ServerInstance->SE->DelFd(this);
ServerInstance->Logs->Log("SOCKET", DEBUG,"Shut down listener on fd %d", this->fd);
if (ServerInstance->SE->Shutdown(this, 2) || ServerInstance->SE->Close(this))
ServerInstance->Logs->Log("SOCKET", DEBUG,"Failed to cancel listener: %s", strerror(errno));
this->fd = -1;
}
}
/* Just seperated into another func for tidiness really.. */
void ListenSocket::AcceptInternal()
{
irc::sockets::sockaddrs client;
irc::sockets::sockaddrs server;
socklen_t length = sizeof(client);
int incomingSockfd = ServerInstance->SE->Accept(this, &client.sa, &length);
ServerInstance->Logs->Log("SOCKET",DEBUG,"HandleEvent for Listensocket %s nfd=%d", bind_desc.c_str(), incomingSockfd);
if (incomingSockfd < 0)
{
ServerInstance->stats->statsRefused++;
return;
}
socklen_t sz = sizeof(server);
if (getsockname(incomingSockfd, &server.sa, &sz))
{
ServerInstance->Logs->Log("SOCKET", DEBUG, "Can't get peername: %s", strerror(errno));
irc::sockets::aptosa(bind_addr, bind_port, server);
}
/*
* XXX -
* this is done as a safety check to keep the file descriptors within range of fd_ref_table.
* its a pretty big but for the moment valid assumption:
* file descriptors are handed out starting at 0, and are recycled as theyre freed.
* therefore if there is ever an fd over 65535, 65536 clients must be connected to the
* irc server at once (or the irc server otherwise initiating this many connections, files etc)
* which for the time being is a physical impossibility (even the largest networks dont have more
* than about 10,000 users on ONE server!)
*/
if (incomingSockfd >= ServerInstance->SE->GetMaxFds())
{
ServerInstance->Logs->Log("SOCKET", DEBUG, "Server is full");
ServerInstance->SE->Shutdown(incomingSockfd, 2);
ServerInstance->SE->Close(incomingSockfd);
ServerInstance->stats->statsRefused++;
return;
}
if (client.sa.sa_family == AF_INET6)
{
/*
* This case is the be all and end all patch to catch and nuke 4in6
* instead of special-casing shit all over the place and wreaking merry
* havoc with crap, instead, we just recreate sockaddr and strip ::ffff: prefix
* if it's a 4in6 IP.
*
* This is, of course, much improved over the older way of handling this
* (pretend it doesn't exist + hack around it -- yes, both were done!)
*
* Big, big thanks to danieldg for his work on this.
* -- w00t
*/
static const unsigned char prefix4in6[12] = { 0,0,0,0, 0,0,0,0, 0,0,0xFF,0xFF };
if (!memcmp(prefix4in6, &client.in6.sin6_addr, 12))
{
// recreate as a sockaddr_in using the IPv4 IP
uint16_t sport = client.in6.sin6_port;
uint32_t addr = *reinterpret_cast<uint32_t*>(client.in6.sin6_addr.s6_addr + 12);
client.in4.sin_family = AF_INET;
client.in4.sin_port = sport;
client.in4.sin_addr.s_addr = addr;
sport = server.in6.sin6_port;
addr = *reinterpret_cast<uint32_t*>(server.in6.sin6_addr.s6_addr + 12);
server.in4.sin_family = AF_INET;
server.in4.sin_port = sport;
server.in4.sin_addr.s_addr = addr;
}
}
ServerInstance->SE->NonBlocking(incomingSockfd);
ModResult res;
FIRST_MOD_RESULT(OnAcceptConnection, res, (incomingSockfd, this, &client, &server));
if (res == MOD_RES_PASSTHRU)
{
std::string type = bind_tag->getString("type", "clients");
if (type == "clients")
{
ServerInstance->Users->AddUser(incomingSockfd, this, &client, &server);
res = MOD_RES_ALLOW;
}
}
if (res == MOD_RES_ALLOW)
{
ServerInstance->stats->statsAccept++;
}
else
{
ServerInstance->stats->statsRefused++;
ServerInstance->Logs->Log("SOCKET",DEFAULT,"Refusing connection on %s - %s",
bind_desc.c_str(), res == MOD_RES_DENY ? "Connection refused by module" : "Module for this port not found");
ServerInstance->SE->Close(incomingSockfd);
}
}
void ListenSocket::HandleEvent(EventType e, int err)
{
switch (e)
{
case EVENT_ERROR:
ServerInstance->Logs->Log("SOCKET",DEFAULT,"ListenSocket::HandleEvent() received a socket engine error event! well shit! '%s'", strerror(err));
break;
case EVENT_WRITE:
ServerInstance->Logs->Log("SOCKET",DEBUG,"*** BUG *** ListenSocket::HandleEvent() got a WRITE event!!!");
break;
case EVENT_READ:
this->AcceptInternal();
break;
}
}
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