uhub/src/netevent.c

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2009-02-19 16:14:09 +00:00
/*
* uhub - A tiny ADC p2p connection hub
* Copyright (C) 2007-2009, 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"
void net_on_read(int fd, short ev, void *arg)
{
static char buf[MAX_RECV_BUF];
struct user* user = (struct user*) arg;
char* pos;
char* start;
ssize_t offset;
ssize_t size;
ssize_t buflen;
int more = 1;
int flag_close = 0;
hub_log(log_trace, "net_on_read() : fd=%d, ev=%d, arg=%p", fd, (int) ev, arg);
if (ev == EV_TIMEOUT)
{
more = 0;
if (user_is_connecting(user))
{
flag_close = quit_timeout;
}
else
{
hub_send_ping(user);
}
}
while (more)
{
offset = 0;
if (user->recv_buf)
{
memcpy(buf, user->recv_buf, user->recv_buf_offset);
offset = user->recv_buf_offset;
}
else
{
offset = 0;
}
size = net_recv(fd, &buf[offset], MAX_RECV_BUF - offset, 0);
if (size == -1)
{
if (net_error() != EWOULDBLOCK)
flag_close = quit_socket_error;
break;
}
else if (size == 0)
{
flag_close = quit_disconnected;
break;
}
else
{
buflen = offset + size;
start = buf;
while ((pos = strchr(start, '\n')))
{
pos[0] = '\0';
if (*start && strlen(start) < user->hub->config->max_recv_buffer)
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{
if (hub_handle_message(user, start, &pos[0]-&start[0]) == -1)
{
flag_close = quit_protocol_error;
more = 0;
break;
}
}
start = &pos[1];
}
if (!more) break;
if (&buf[offset + size] > &start[0])
{
if (!user->recv_buf)
{
user->recv_buf = hub_malloc(user->hub->config->max_recv_buffer);
}
if (!user->recv_buf)
{
flag_close = quit_memory_error;
break;
}
else
{
memcpy(user->recv_buf, start, &buf[offset + size] - &start[0]);
user->recv_buf_offset = &buf[offset + size] - &start[0];
}
}
else
{
if (user->recv_buf)
{
hub_free(user->recv_buf);
user->recv_buf = 0;
user->recv_buf_offset = 0;
}
}
}
}
if (flag_close)
{
user_disconnect(user, flag_close);
return;
}
if (user_is_logged_in(user))
{
if (user->ev_read)
{
struct timeval timeout = { TIMEOUT_IDLE, 0 };
event_add(user->ev_read, &timeout);
}
}
else if (user_is_connecting(user))
{
if (user->ev_read)
{
struct timeval timeout = { TIMEOUT_HANDSHAKE, 0 };
event_add(user->ev_read, &timeout);
}
}
}
void net_on_write(int fd, short ev, void *arg)
{
struct user* user = (struct user*) arg;
struct adc_message* msg;
int ret;
int length;
int close_flag = 0;
msg = list_get_first(user->send_queue);
while (msg)
{
length = msg->length - user->send_queue_offset;
ret = net_send(user->sd, &msg->cache[user->send_queue_offset], length, UHUB_SEND_SIGNAL);
if (ret == 0 || (ret == -1 && net_error() == EWOULDBLOCK))
{
close_flag = 0;
break;
}
else if (ret > 0)
{
user->tm_last_write = time(NULL);
if (ret == length)
{
#ifdef DEBUG_SENDQ
hub_log(log_error, "SENDQ: sent=%d bytes/%d (all), send_queue_size=%d, offset=%d", ret, (int) msg->length, user->send_queue_size, user->send_queue_offset);
#endif
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user->send_queue_size -= ret;
user->send_queue_offset = 0;
#ifdef DEBUG_SENDQ
if ((user->send_queue_size < 0) || (user->send_queue_offset < 0))
{
hub_log(log_error, "INVALID: send_queue_size=%d, send_queue_offset=%d", user->send_queue_size, user->send_queue_offset);
}
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#endif
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list_remove(user->send_queue, msg);
if (user_flag_get(user, flag_user_list) && (msg == user->info || user->send_queue_size == 0))
{
user_flag_unset(user, flag_user_list);
}
adc_msg_free(msg);
msg = 0;
if (user->send_queue_size == 0)
break;
}
else
{
#ifdef DEBUG_SENDQ
hub_log(log_error, "SENDQ: sent=%d bytes/%d (part), send_queue_size=%d, offset=%d", ret, (int) msg->length, user->send_queue_size, user->send_queue_offset);
#endif
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user->send_queue_size -= ret;
user->send_queue_offset += ret;
#ifdef DEBUG_SENDQ
if ((user->send_queue_size < 0) || (user->send_queue_offset < 0) || (user->send_queue_offset > msg->length))
{
hub_log(log_error, "INVALID: send_queue_size=%d, send_queue_offset=%d", user->send_queue_size, user->send_queue_offset);
}
#endif
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break;
}
}
else
{
close_flag = quit_socket_error;
break;
}
msg = list_get_first(user->send_queue);
}
if (close_flag)
{
user_disconnect(user, close_flag);
}
else
{
if (user->send_queue_size > 0 && user->ev_write)
event_add(user->ev_write, NULL);
}
}
void net_on_accept(int server_fd, short ev, void *arg)
{
struct hub_info* hub = (struct hub_info*) arg;
struct user* user = 0;
int accept_more = 1;
const char* addr;
struct timeval timeout = { TIMEOUT_CONNECTED, 0 };
while (accept_more)
{
int fd = net_accept(server_fd);
if (fd == -1)
{
if (net_error() == EWOULDBLOCK)
{
break;
}
else
{
hub_log(log_error, "Accept error: %d %s", net_error(), strerror(net_error()));
break;
}
}
addr = net_get_peer_address(fd);
/* FIXME: Should have a plugin log this */
hub_log(log_trace, "Got connection from %s", addr);
/* FIXME: A plugin should perform this check: is IP banned? */
if (acl_is_ip_banned(hub->acl, addr))
{
hub_log(log_info, "Denied [%s] (IP banned)", addr);
net_close(fd);
continue;
}
user = user_create(hub, fd);
if (!user)
{
hub_log(log_error, "Unable to create user after socket accepted. Out of memory?");
net_close(fd);
break;
}
/* Store IP address in user object */
ip_convert_to_binary(addr, &user->ipaddr);
net_set_nonblocking(fd, 1);
net_set_nosigpipe(fd, 1);
event_set(user->ev_read, fd, EV_READ | EV_PERSIST, net_on_read, user);
event_set(user->ev_write, fd, EV_WRITE, net_on_write, user);
event_add(user->ev_read, &timeout);
}
}
#ifdef ADC_UDP_OPERATION
extern void net_on_packet(int fd, short ev, void *arg)
{
static char buffer[1024] = {0,};
// struct hub_info* hub = (struct hub_info*) arg;
// struct user* user = 0;
ssize_t size;
struct sockaddr_storage from;
socklen_t fromlen;
size = recvfrom(fd, buffer, 1024, 0, (struct sockaddr*) &from, &fromlen);
// FIXME: A plugin should handle this!
hub_log(log_info, "Datagram [%s] (%d bytes)", buffer, (int) size);
}
#endif