uhub/src/network/connection.c

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/*
* 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"
extern struct hub_info* g_hub;
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static inline int net_con_flag_get(struct net_connection* con, unsigned int flag)
{
return con->flags & flag;
}
static inline void net_con_flag_set(struct net_connection* con, unsigned int flag)
{
con->flags |= flag;
}
static inline void net_con_flag_unset(struct net_connection* con, unsigned int flag)
{
con->flags &= ~flag;
}
static void net_con_event(int fd, short ev, void *arg)
{
struct net_connection* con = (struct net_connection*) arg;
#ifdef SSL_SUPPORT
if (!con->ssl)
{
#endif
net_event(fd, ev, con->ptr);
#ifdef SSL_SUPPORT
}
else
{
LOG_DEBUG("net_con_event: ev=%d, con=%p", ev, con);
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if (ev & (EV_READ | EV_WRITE))
{
if (net_con_flag_get(con, NET_WANT_SSL_ACCEPT))
{
if (net_con_ssl_accept(con) < 0)
net_event(fd, EV_READ, con->ptr);
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}
else if (net_con_flag_get(con, NET_WANT_SSL_CONNECT))
{
if (net_con_ssl_connect(con) < 0)
net_event(fd, EV_READ, con->ptr);
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}
else if (ev == EV_READ && net_con_flag_get(con, NET_WANT_SSL_READ))
{
net_event(fd, EV_WRITE, con->ptr);
}
else if (ev == EV_WRITE && net_con_flag_get(con, NET_WANT_SSL_WRITE))
{
net_event(fd, ev & EV_READ, con->ptr);
}
else
{
net_event(fd, ev, con->ptr);
}
}
else
{
net_event(fd, ev, con->ptr);
}
}
#endif
}
void net_con_initialize(struct net_connection* con, int sd, struct ip_addr_encap* addr, const void* ptr, int events)
{
LOG_DEBUG("net_con_initialize: sd=%d, ptr=%p", sd, ptr);
con->sd = sd;
con->ptr = (void*) ptr;
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con->last_send = time(0);
con->last_recv = con->last_send;
/** IP address of peer */
if (addr)
{
memcpy(&con->ipaddr, addr, sizeof(struct ip_addr_encap));
}
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if (events & EV_READ) net_con_flag_set(con, NET_WANT_READ);
if (events & EV_WRITE) net_con_flag_set(con, NET_WANT_WRITE);
event_set(&con->event, con->sd, events | EV_PERSIST, net_con_event, con);
event_base_set(g_hub->evbase, &con->event);
event_add(&con->event, 0);
net_set_nonblocking(sd, 1);
net_set_nosigpipe(sd, 1);
#ifdef SSL_SUPPORT
con->ssl = NULL;
con->write_len = 0;
con->ssl = SSL_new(g_hub->ssl_ctx);
LOG_DEBUG("SSL_new");
SSL_set_fd(con->ssl, con->sd);
LOG_DEBUG("SSL_set_fd");
#endif
}
void net_con_update(struct net_connection* con, int events)
{
if (event_pending(&con->event, EV_READ | EV_WRITE, 0) == events)
return;
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if (events & EV_READ) net_con_flag_set(con, NET_WANT_READ);
if (events & EV_WRITE) net_con_flag_set(con, NET_WANT_WRITE);
event_del(&con->event);
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event_set(&con->event, con->sd, events | EV_PERSIST, net_con_event, con);
event_add(&con->event, 0);
}
void net_con_close(struct net_connection* con)
{
if (!event_pending(&con->event, EV_READ | EV_WRITE, 0))
return;
event_del(&con->event);
net_close(con->sd);
con->sd = -1;
}
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#ifdef SSL_SUPPORT
static int handle_openssl_error(struct net_connection* con, int ret)
{
int error = SSL_get_error(con->ssl, ret);
switch (error)
{
case SSL_ERROR_ZERO_RETURN:
LOG_DEBUG("SSL_get_error: ret=%d, error=%d: SSL_ERROR_ZERO_RETURN", ret, error);
return -1;
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case SSL_ERROR_WANT_READ:
LOG_DEBUG("SSL_get_error: ret=%d, error=%d: SSL_ERROR_WANT_READ", ret, error);
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net_con_update(con, EV_READ);
net_con_flag_set(con, NET_WANT_SSL_READ);
return 0;
case SSL_ERROR_WANT_WRITE:
LOG_DEBUG("SSL_get_error: ret=%d, error=%d: SSL_ERROR_WANT_WRITE", ret, error);
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net_con_update(con, EV_READ | EV_WRITE);
net_con_flag_set(con, NET_WANT_SSL_WRITE);
return 0;
case SSL_ERROR_WANT_CONNECT:
LOG_DEBUG("SSL_get_error: ret=%d, error=%d: SSL_ERROR_WANT_CONNECT", ret, error);
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net_con_update(con, EV_READ | EV_WRITE);
net_con_flag_set(con, NET_WANT_SSL_CONNECT);
return 0;
case SSL_ERROR_WANT_ACCEPT:
LOG_DEBUG("SSL_get_error: ret=%d, error=%d: SSL_ERROR_WANT_ACCEPT", ret, error);
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net_con_update(con, EV_READ | EV_WRITE);
net_con_flag_set(con, NET_WANT_SSL_ACCEPT);
return 0;
case SSL_ERROR_WANT_X509_LOOKUP:
LOG_DEBUG("SSL_get_error: ret=%d, error=%d: SSL_ERROR_WANT_X509_LOOKUP", ret, error);
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return 0;
case SSL_ERROR_SYSCALL:
LOG_DEBUG("SSL_get_error: ret=%d, error=%d: SSL_ERROR_SYSCALL", ret, error);
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/* if ret == 0, connection closed, if ret == -1, check with errno */
if (ret == 0)
return -1;
else
return -net_error();
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case SSL_ERROR_SSL:
LOG_DEBUG("SSL_get_error: ret=%d, error=%d: SSL_ERROR_SSL", ret, error);
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/* internal openssl error */
return -1;
}
return -1;
}
#endif
ssize_t net_con_send(struct net_connection* con, const void* buf, size_t len)
{
#ifdef SSL_SUPPORT
if (!con->ssl)
{
#endif
int ret = net_send(con->sd, buf, len, UHUB_SEND_SIGNAL);
LOG_DEBUG("net_send: ret=%d", ret);
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if (ret > 0)
{
con->last_send = time(0);
}
else if (ret == -1 && (net_error() == EWOULDBLOCK || net_error() == EINTR))
{
return 0;
}
else
{
return -1;
}
return ret;
#ifdef SSL_SUPPORT
}
else
{
int ret = SSL_write(con->ssl, buf, len);
LOG_DEBUG("net_send: ret=%d", ret);
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if (ret > 0)
{
con->last_send = time(0);
net_con_flag_unset(con, NET_WANT_SSL_READ);
}
else
{
return handle_openssl_error(con, ret);
}
return ret;
}
#endif
}
ssize_t net_con_recv(struct net_connection* con, void* buf, size_t len)
{
#ifdef SSL_SUPPORT
if (!con->ssl)
{
#endif
int ret = net_recv(con->sd, buf, len, 0);
LOG_DEBUG("net_send: ret=%d", ret);
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if (ret > 0)
{
con->last_recv = time(0);
}
else if (ret == -1 && (net_error() == EWOULDBLOCK || net_error() == EINTR))
{
return 0;
}
else
{
return -1;
}
return ret;
#ifdef SSL_SUPPORT
}
else
{
int ret = SSL_read(con->ssl, buf, len);
LOG_DEBUG("net_send: ret=%d", ret);
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if (ret > 0)
{
con->last_recv = time(0);
net_con_flag_unset(con, NET_WANT_SSL_WRITE);
}
else
{
return handle_openssl_error(con, ret);
}
return ret;
}
#endif
}
#ifdef SSL_SUPPORT
ssize_t net_con_ssl_accept(struct net_connection* con)
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{
net_con_flag_set(con, NET_WANT_SSL_ACCEPT);
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ssize_t ret = SSL_accept(con->ssl);
LOG_DEBUG("SSL_accept() ret=%d", ret);
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if (ret > 0)
{
net_con_flag_unset(con, NET_WANT_SSL_ACCEPT);
net_con_flag_unset(con, NET_WANT_SSL_READ);
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}
else
{
return handle_openssl_error(con, ret);
}
return ret;
}
ssize_t net_con_ssl_connect(struct net_connection* con)
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{
net_con_flag_set(con, NET_WANT_SSL_CONNECT);
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ssize_t ret = SSL_connect(con->ssl);
if (ret > 0)
{
net_con_flag_unset(con, NET_WANT_SSL_CONNECT);
}
else
{
return handle_openssl_error(con, ret);
}
return ret;
}
#endif /* SSL_SUPPORT */
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