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/*
* uhub - A tiny ADC p2p connection hub
* Copyright (C) 2007-2010, Jan Vidar Krey
*
* This program 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; either version 3 of the License, or
* (at your option) any later version.
*
* 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 <uhub.h>
#include "ioqueue.h"
#include "probe.h"
int handle_net_read(struct hub_user* user)
{
static char buf[MAX_RECV_BUF];
struct ioq_recv* q = user->recv_queue;
size_t buf_size = ioq_recv_get(q, buf, MAX_RECV_BUF);
ssize_t size;
if (user_flag_get(user, flag_maxbuf))
buf_size = 0;
size = net_con_recv(user->connection, buf + buf_size, MAX_RECV_BUF - buf_size);
if (size > 0)
buf_size += size;
if (size < 0)
{
if (size == -1)
return quit_disconnected;
else
return quit_socket_error;
}
else if (size == 0)
{
return 0;
}
else
{
char* lastPos = 0;
char* start = buf;
char* pos = 0;
size_t remaining = buf_size;
while ((pos = memchr(start, '\n', remaining)))
{
lastPos = pos+1;
pos[0] = '\0';
#ifdef DEBUG_SENDQ
LOG_DUMP("PROC: \"%s\" (%d)\n", start, (int) (pos - start));
#endif
if (user_flag_get(user, flag_maxbuf))
{
user_flag_unset(user, flag_maxbuf);
}
else
{
if (((pos - start) > 0) && user->hub->config->max_recv_buffer > (pos - start))
{
if (hub_handle_message(user->hub, user, start, (pos - start)) == -1)
{
return quit_protocol_error;
}
}
}
pos[0] = '\n'; /* FIXME: not needed */
pos ++;
remaining -= (pos - start);
start = pos;
}
if (lastPos || remaining)
{
if (remaining < (size_t) user->hub->config->max_recv_buffer)
{
ioq_recv_set(q, lastPos ? lastPos : buf, remaining);
}
else
{
ioq_recv_set(q, 0, 0);
user_flag_set(user, flag_maxbuf);
LOG_WARN("Received message past max_recv_buffer, dropping message.");
}
}
else
{
ioq_recv_set(q, 0, 0);
}
}
return 0;
}
int handle_net_write(struct hub_user* user)
{
int ret = 0;
while (ioq_send_get_bytes(user->send_queue))
{
ret = ioq_send_send(user->send_queue, user->connection);
if (ret <= 0)
break;
}
if (ret < 0)
return quit_socket_error;
if (ioq_send_get_bytes(user->send_queue))
{
user_net_io_want_write(user);
}
else
{
user_net_io_want_read(user);
}
return 0;
}
void net_event(struct net_connection* con, int event, void *arg)
{
struct hub_user* user = (struct hub_user*) arg;
int flag_close = 0;
#ifdef DEBUG_SENDQ
LOG_TRACE("net_event() : fd=%d, ev=%d, arg=%p", con->sd, (int) event, arg);
#endif
if (event == NET_EVENT_TIMEOUT)
{
if (user_is_connecting(user))
{
hub_disconnect_user(user->hub, user, quit_timeout);
}
return;
}
if (event & NET_EVENT_READ)
{
flag_close = handle_net_read(user);
if (flag_close)
{
hub_disconnect_user(user->hub, user, flag_close);
return;
}
}
if (event & NET_EVENT_WRITE)
{
flag_close = handle_net_write(user);
if (flag_close)
{
hub_disconnect_user(user->hub, user, flag_close);
return;
}
}
}
void net_on_accept(struct net_connection* con, int event, void *arg)
{
struct hub_info* hub = (struct hub_info*) arg;
struct hub_probe* probe = 0;
struct ip_addr_encap ipaddr;
int server_fd = net_con_get_sd(con);
plugin_st status;
for (;;)
{
int fd = net_accept(server_fd, &ipaddr);
if (fd == -1)
{
#ifdef WINSOCK
if (net_error() == WSAEWOULDBLOCK)
#else
if (net_error() == EWOULDBLOCK)
#endif
{
break;
}
else
{
LOG_ERROR("Accept error: %d %s", net_error(), strerror(net_error()));
break;
}
}
status = plugin_check_ip_early(hub, &ipaddr);
if (status == st_deny)
{
plugin_log_connection_denied(hub, &ipaddr);
net_close(fd);
continue;
}
plugin_log_connection_accepted(hub, &ipaddr);
probe = probe_create(hub, fd, &ipaddr);
if (!probe)
{
LOG_ERROR("Unable to create probe after socket accepted. Out of memory?");
net_close(fd);
break;
}
}
}
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