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/*
* InspIRCd -- Internet Relay Chat Daemon
*
* Copyright (C) 2014 Adam <Adam@anope.org>
* Copyright (C) 2009 Daniel De Graaf <danieldg@inspircd.org>
* Copyright (C) 2009 Uli Schlachter <psychon@znc.in>
* Copyright (C) 2009 Craig Edwards <craigedwards@brainbox.cc>
* 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 <vector>
#include <string>
#include <map>
#include "exitcodes.h"
#include "inspircd.h"
#include "socketengine.h"
#include <sys/poll.h>
#include <sys/resource.h>
/** A specialisation of the SocketEngine class, designed to use poll().
*/
namespace
{
/** These are used by poll() to hold socket events
*/
std::vector<struct pollfd> events(16);
/** This vector maps fds to an index in the events array.
*/
std::vector<int> fd_mappings(16);
}
void SocketEngine::Init()
{
struct rlimit limits;
if (!getrlimit(RLIMIT_NOFILE, &limits))
{
MAX_DESCRIPTORS = limits.rlim_cur;
}
else
{
// MAX_DESCRIPTORS is mainly used for display purposes, it's not a problem that getrlimit() failed
MAX_DESCRIPTORS = -1;
}
}
void SocketEngine::Deinit()
{
}
void SocketEngine::RecoverFromFork()
{
}
static int mask_to_poll(int event_mask)
{
int rv = 0;
if (event_mask & (FD_WANT_POLL_READ | FD_WANT_FAST_READ))
rv |= POLLIN;
if (event_mask & (FD_WANT_POLL_WRITE | FD_WANT_FAST_WRITE | FD_WANT_SINGLE_WRITE))
rv |= POLLOUT;
return rv;
}
bool SocketEngine::AddFd(EventHandler* eh, int event_mask)
{
int fd = eh->GetFd();
if (fd < 0)
{
ServerInstance->Logs->Log("SOCKET", LOG_DEBUG, "AddFd out of range: (fd: %d)", fd);
return false;
}
if (static_cast<unsigned int>(fd) < fd_mappings.size() && fd_mappings[fd] != -1)
{
ServerInstance->Logs->Log("SOCKET", LOG_DEBUG, "Attempt to add duplicate fd: %d", fd);
return false;
}
unsigned int index = CurrentSetSize;
if (!SocketEngine::AddFdRef(eh))
{
ServerInstance->Logs->Log("SOCKET", LOG_DEBUG, "Attempt to add duplicate fd: %d", fd);
return false;
}
while (static_cast<unsigned int>(fd) >= fd_mappings.size())
fd_mappings.resize(fd_mappings.size() * 2, -1);
fd_mappings[fd] = index;
ResizeDouble(events);
events[index].fd = fd;
events[index].events = mask_to_poll(event_mask);
ServerInstance->Logs->Log("SOCKET", LOG_DEBUG, "New file descriptor: %d (%d; index %d)", fd, events[index].events, index);
eh->SetEventMask(event_mask);
return true;
}
void SocketEngine::OnSetEvent(EventHandler* eh, int old_mask, int new_mask)
{
int fd = eh->GetFd();
if (fd < 0 || static_cast<unsigned int>(fd) >= fd_mappings.size() || fd_mappings[fd] == -1)
{
ServerInstance->Logs->Log("SOCKET", LOG_DEBUG, "SetEvents() on unknown fd: %d", eh->GetFd());
return;
}
events[fd_mappings[fd]].events = mask_to_poll(new_mask);
}
void SocketEngine::DelFd(EventHandler* eh)
{
int fd = eh->GetFd();
if (fd < 0)
{
ServerInstance->Logs->Log("SOCKET", LOG_DEBUG, "DelFd out of range: (fd: %d)", fd);
return;
}
if (static_cast<unsigned int>(fd) >= fd_mappings.size() || fd_mappings[fd] == -1)
{
ServerInstance->Logs->Log("SOCKET", LOG_DEBUG, "DelFd() on unknown fd: %d", fd);
return;
}
unsigned int index = fd_mappings[fd];
unsigned int last_index = CurrentSetSize - 1;
int last_fd = events[last_index].fd;
if (index != last_index)
{
// We need to move the last fd we got into this gap (gaps are evil!)
// So update the mapping for the last fd to its new position
fd_mappings[last_fd] = index;
// move last_fd from last_index into index
events[index].fd = last_fd;
events[index].events = events[last_index].events;
}
// Now remove all data for the last fd we got into out list.
// Above code made sure this always is right
fd_mappings[fd] = -1;
events[last_index].fd = 0;
events[last_index].events = 0;
SocketEngine::DelFdRef(eh);
ServerInstance->Logs->Log("SOCKET", LOG_DEBUG, "Remove file descriptor: %d (index: %d) "
"(Filled gap with: %d (index: %d))", fd, index, last_fd, last_index);
}
int SocketEngine::DispatchEvents()
{
int i = poll(&events[0], CurrentSetSize, 1000);
int processed = 0;
ServerInstance->UpdateTime();
for (int index = 0; index < CurrentSetSize && processed < i; index++)
{
struct pollfd& pfd = events[index];
// Copy these in case the vector gets resized and pfd invalidated
const int fd = pfd.fd;
const short revents = pfd.revents;
if (revents)
processed++;
EventHandler* eh = GetRef(fd);
if (!eh)
continue;
if (revents & POLLHUP)
{
eh->HandleEvent(EVENT_ERROR, 0);
continue;
}
if (revents & POLLERR)
{
// Get error number
socklen_t codesize = sizeof(int);
int errcode;
if (getsockopt(fd, SOL_SOCKET, SO_ERROR, &errcode, &codesize) < 0)
errcode = errno;
eh->HandleEvent(EVENT_ERROR, errcode);
continue;
}
if (revents & POLLIN)
{
eh->SetEventMask(eh->GetEventMask() & ~FD_READ_WILL_BLOCK);
eh->HandleEvent(EVENT_READ);
if (eh != GetRef(fd))
// whoops, deleted out from under us
continue;
}
if (revents & POLLOUT)
{
int mask = eh->GetEventMask();
mask &= ~(FD_WRITE_WILL_BLOCK | FD_WANT_SINGLE_WRITE);
eh->SetEventMask(mask);
// The vector could've been resized, reference can be invalid by now; don't use it
events[index].events = mask_to_poll(mask);
eh->HandleEvent(EVENT_WRITE);
}
}
return i;
}
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