void epollEngine::MessageLoop()
{
const static int maxevents = 1024;
struct epoll_event events[1024];
int nfds, i;
BaseSocket * s;
while(m_running)
{
nfds = epoll_wait(epoll_fd, events, maxevents, 1000);
for(i = 0; i < nfds; ++i)
{
s = fds[events[i].data.fd];
if(s == 0)
{
printf("epoll returned invalid fd %u\n", events[i].data.fd);
continue;
}
if(events[i].events & EPOLLHUP || events[i].events & EPOLLERR)
{
s->OnError(errno);
}
else if(events[i].events & EPOLLIN)
{
s->OnRead(0);
if(s->Writable() && !s->m_writeLock)
{
++s->m_writeLock;
WantWrite(s);
}
}
else if(events[i].events & EPOLLOUT)
{
s->OnWrite(0);
if(!s->Writable())
{
/* change back to read state */
struct epoll_event ev;
memset(&ev, 0, sizeof(epoll_event));
ev.data.fd = s->GetFd();
ev.events = EPOLLIN | EPOLLET;
epoll_ctl(epoll_fd, EPOLL_CTL_MOD, s->GetFd(), &ev);
--s->m_writeLock;
}
}
}
}
}
void SelectEngine::Shutdown()
{
m_running = false;
m_socketLock.Acquire();
BaseSocket * s;
for(map<int, BaseSocket*>::iterator itr = m_sockets.begin(); itr != m_sockets.end(); )
{
s = itr->second;
++itr;
s->Delete();
}
m_socketLock.Release();
/* shutdown the socket deleter */
sSocketDeleter.Kill();
/* delete the socket deleter */
delete SocketDeleter::getSingletonPtr();
/* delete us */
delete this;
}
int main(int argc, char *argv[])
{
int port = 8888;
string ip = "127.0.0.1";
BaseSocket toserver;
#ifdef TEST_TCP
if (!toserver.Create()) {
cerr << "client create error." << endl;
return -1;
}
string host;
int peer;
if (!toserver.Connect(ip, port)) {
cerr << "connect to server error." << endl;
return -1;
}
if (!toserver.GetPeer(host, peer)) {
cerr << "server get peer error." << endl;
//return -1;
}
cout << "connected to " << host << " : " << peer << endl;
cout << toserver.Send("this is the client sending msg...") << endl;
cout << toserver.Recv() << endl;
return 0;
#endif
#ifdef TEST_UDP
if (!toserver.Create(true)) {
cerr << "client create error." << endl;
return -1;
}
toserver.SendTo("udp test from client...", ip, port);
cout << toserver.RecvFrom(ip, port) << endl;
return 0;
#endif
}
void kqueueEngine::MessageLoop()
{
const static int maxevents = MAX_DESCRIPTORS;
timespec timeout;
timeout.tv_sec = 1;
timeout.tv_nsec = 0;
struct kevent events[MAX_DESCRIPTORS];
struct kevent ev;
int nfds, i;
BaseSocket * s;
while(m_running)
{
nfds = kevent(kq, 0, 0, events, maxevents, &timeout);
for(i = 0; i < nfds; ++i)
{
s = fds[events[i].ident];
if(s == 0)
{
printf("kqueue returned invalid fd %u\n", events[i].ident);
continue;
}
if(events[i].flags & EV_EOF || events[i].flags & EV_ERROR)
{
s->OnError(events[i].fflags);
continue;
}
if(events[i].filter == EVFILT_READ)
{
s->OnRead(0);
if(s->Writable() && !s->m_writeLock)
{
++s->m_writeLock;
WantWrite(s);
}
}
else if(events[i].filter == EVFILT_WRITE)
{
s->OnWrite(0);
if(!s->Writable())
{
--s->m_writeLock;
EV_SET(&ev, s->GetFd(), EVFILT_READ, EV_ADD, 0, 0, NULL);
if(kevent(kq, &ev, 1, NULL, 0, NULL) < 0)
printf("!! could not modify kevent (to read) for fd %u\n", s->GetFd());
}
else
{
EV_SET(&ev, s->GetFd(), EVFILT_WRITE, EV_ADD | EV_ONESHOT, 0, 0, NULL);
if(kevent(kq, &ev, 1, NULL, 0, NULL) < 0)
printf("!! could not modify kevent (to write) for fd %u\n", s->GetFd());
}
}
else
{
printf("Unknwon filter: %u Fflags: %u, fd: %u, flags: %u\n", events[i].filter, events[i].fflags, events[i].ident, events[i].flags);
}
}
}
}
void pollEngine::MessageLoop()
{
const static int maxevents = 1024;
int nfds, i;
BaseSocket * s;
timeval timeout;
timeout.tv_sec = 0;
timeout.tv_usec = 50000;
while(m_running)
{
nfds = poll(poll_events, highest_fd + 1, 50);
if(!m_running)
return;
if(nfds > 0)
{
for(i = 0; i <= highest_fd; ++i)
{
if(poll_events[i].fd > 0)
{
s = fds[i];
if(s == 0)
{
printf("poll returned invalid fd %u\n", i);
poll_events[i].fd = -1;
poll_events[i].events = 0;
poll_events[i].revents = 0;
continue;
}
if(poll_events[i].revents & POLLERR || poll_events[i].revents & POLLHUP)
{
s->Disconnect();
continue;
}
if(poll_events[i].revents & POLLIN)
{
s->OnRead(0);
/* are we writable now? */
if(s->Writable() && !s->m_writeLock)
{
++s->m_writeLock;
poll_events[i].events = POLLOUT;
}
}
if(poll_events[i].revents & POLLOUT)
{
s->OnWrite(0);
/* are we readable now? */
if(!s->Writable())
{
--s->m_writeLock;
poll_events[i].events = POLLIN;
}
}
}
}
}
}
}
// tunnel data from fdfrom to fdto (unfiltered)
// return false if throughput larger than target throughput
bool FDTunnel::tunnel(BaseSocket &sockfrom, BaseSocket &sockto, bool twoway, off_t targetthroughput, bool ignore)
{
if (targetthroughput == 0) {
#ifdef DGDEBUG
std::cout << "No data expected, tunnelling aborted." << std::endl;
#endif
return true;
}
#ifdef DGDEBUG
if (targetthroughput < 0)
std::cout << "Tunnelling without known content-length" << std::endl;
else
std::cout << "Tunnelling with content length " << targetthroughput << std::endl;
#endif
if ((sockfrom.bufflen - sockfrom.buffstart) > 0) {
#ifdef DGDEBUG
std::cout << "Data in fdfrom's buffer; sending " << (sockfrom.bufflen - sockfrom.buffstart) << " bytes" << std::endl;
#endif
if (!sockto.writeToSocket(sockfrom.buffer + sockfrom.buffstart, sockfrom.bufflen - sockfrom.buffstart, 0, 120, false))
throw std::runtime_error(std::string("Can't write to socket: ") + strerror(errno));
throughput += sockfrom.bufflen - sockfrom.buffstart;
sockfrom.bufflen = 0;
sockfrom.buffstart = 0;
}
int maxfd, rc, fdfrom, fdto;
fdfrom = sockfrom.getFD();
fdto = sockto.getFD();
maxfd = fdfrom > fdto ? fdfrom : fdto; // find the maximum file
// descriptor. As Linux normally allows each process
// to have up to 1024 file descriptors, maxfd
// prevents the kernel having to look through all
// 1024 fds each fdSet could contain
char buff[32768]; // buffer for the input
timeval timeout; // timeval struct
timeout.tv_sec = 120; // modify the struct so its a 120 sec timeout
timeout.tv_usec = 0;
fd_set fdSet; // file descriptor set
FD_ZERO(&fdSet); // clear the set
FD_SET(fdto, &fdSet); // add fdto to the set
FD_SET(fdfrom, &fdSet); // add fdfrom to the set
timeval t; // we need a 2nd copy used later
fd_set inset; // we need a 2nd copy used later
fd_set outset; // we need a 3rd copy used later
bool done = false; // so we get past the first while
while (!done && (targetthroughput > -1 ? throughput < targetthroughput : true)) {
done = true; // if we don't make a sucessful read and write this
// flag will stay true and so the while() will exit
inset = fdSet; // as select() can modify the sets we need to take
t = timeout; // a copy each time round and use that
if (ignore && !twoway) FD_CLR(fdto, &inset);
if (selectEINTR(maxfd + 1, &inset, NULL, NULL, &t) < 1) {
break; // an error occured or it timed out so end while()
}
if (FD_ISSET(fdfrom, &inset)) // fdfrom is ready to be read from
{
if (targetthroughput > -1)
// we have a target throughput - only read in the exact amount of data we've been told to
// plus 2 bytes to "solve" an IE post bug with multipart/form-data forms:
// adds an extra CRLF on certain requests, that it doesn't count in reported content-length
rc = sockfrom.readFromSocket(buff, (((int)sizeof(buff) < ((targetthroughput - throughput)/*+2*/)) ? sizeof(buff) : (targetthroughput - throughput)/* + 2*/), 0, 0, false);
else
rc = sockfrom.readFromSocket(buff, sizeof(buff), 0, 0, false);
// read as much as is available
if (rc < 0) {
break; // an error occured so end the while()
}
else if (!rc) {
done = true; // none received so pipe is closed so flag it
}
else // some data read
{
throughput += rc; // increment our counter used to log
outset = fdSet; // take a copy to work with
FD_CLR(fdfrom, &outset); // remove fdfrom from the set
// as we are only interested in writing to fdto
t = timeout; // take a copy to work with
if (selectEINTR(fdto + 1, NULL, &outset, NULL, &t) < 1) {
break; // an error occured or timed out so end while()
}
if (FD_ISSET(fdto, &outset)) // fdto ready to write to
{
if (!sockto.writeToSocket(buff, rc, 0, 0, false)) // write data
{
break; // was an error writing
}
done = false; // flag to say data still to be handled
} else {
break; // should never get here
}
}
}
if (FD_ISSET(fdto, &inset)) // fdto is ready to be read from
{
if (!twoway) {
// since HTTP works on a simple request/response basis, with no explicit
// communications from the client until the response has been completed
// (just TCP cruft, which is of no interest to us here), tunnels only
// need to be one way. As soon as the client tries to send data, break
// the tunnel, as it will be a new request, possibly to an entirely
// different webserver. This is important for proper filtering when
// persistent connection support gets implemented. PRA 2005-11-14
#ifdef DGDEBUG
std::cout << "fdto is sending data; closing tunnel. (This must be a persistent connection.)" << std::endl;
#endif
break;
}
// read as much as is available
rc = sockto.readFromSocket(buff, sizeof(buff), 0, 0, false);
if (rc < 0) {
break; // an error occured so end the while()
}
else if (!rc) {
done = true; // none received so pipe is closed so flag it
break;
}
else // some data read
{
outset = fdSet; // take a copy to work with
FD_CLR(fdto, &outset); // remove fdto from the set
// as we are only interested in writing to fdfrom
t = timeout; // take a copy to work with
if (selectEINTR(fdfrom + 1, NULL, &outset, NULL, &t) < 1) {
break; // an error occured or timed out so end while()
}
if (FD_ISSET(fdfrom, &outset)) // fdfrom ready to write to
{
if (!sockfrom.writeToSocket(buff, rc, 0, 0, false)) // write data
{
break; // was an error writing
}
done = false; // flag to say data still to be handled
} else {
break; // should never get here
}
}
}
}
#ifdef DGDEBUG
if ((throughput >= targetthroughput) && (targetthroughput > -1))
std::cout << "All expected data tunnelled. (expected " << targetthroughput << "; tunnelled " << throughput << ")" << std::endl;
else
std::cout <<"Tunnel closed."<< std::endl;
#endif
return (targetthroughput > -1) ? (throughput <= targetthroughput) : true;
}
