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/* vim:ts=8:sts=8:sw=4:noai:noexpandtab
*
* network send wrapper.
*
* Copyright (c) 2006-2010 Miru Limited.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include <errno.h>
#ifdef CONFIG_HAVE_POLL
# include <poll.h>
#endif
#ifndef _WIN32
# include <sys/socket.h>
# include <netinet/in.h>
# include <arpa/inet.h>
#endif
#include <impl/i18n.h>
#include <impl/framework.h>
#include <impl/net.h>
#include <impl/socket.h>
#define NET_DEBUG
#if !defined(ENETUNREACH) && defined(WSAENETUNREACH)
# define ENETUNREACH WSAENETUNREACH
#endif
#if !defined(EHOSTUNREACH) && defined(WSAEHOSTUNREACH)
# define EHOSTUNREACH WSAEHOSTUNREACH
#endif
#if !defined(ENOBUFS) && defined(WSAENOBUFS)
# define ENOBUFS WSAENOBUFS
#endif
/* locked and rate regulated sendto
*
* on success, returns number of bytes sent. on error, -1 is returned, and
* errno set appropriately.
*/
ssize_t
pgm_sendto (
pgm_sock_t* sock,
bool use_rate_limit,
bool use_router_alert,
const void* restrict buf,
size_t len,
const struct sockaddr* restrict to,
socklen_t tolen
)
{
pgm_assert( NULL != sock );
pgm_assert( NULL != buf );
pgm_assert( len > 0 );
pgm_assert( NULL != to );
pgm_assert( tolen > 0 );
#ifdef NET_DEBUG
char saddr[INET_ADDRSTRLEN];
pgm_sockaddr_ntop (to, saddr, sizeof(saddr));
pgm_debug ("pgm_sendto (sock:%p use_rate_limit:%s use_router_alert:%s buf:%p len:%zu to:%s [toport:%d] tolen:%d)",
(const void*)sock,
use_rate_limit ? "TRUE" : "FALSE",
use_router_alert ? "TRUE" : "FALSE",
(const void*)buf,
len,
saddr,
ntohs (((const struct sockaddr_in*)to)->sin_port),
(int)tolen);
#endif
const int send_sock = use_router_alert ? sock->send_with_router_alert_sock : sock->send_sock;
if (use_rate_limit &&
!pgm_rate_check (&sock->rate_control, len, sock->is_nonblocking))
{
errno = ENOBUFS;
return (const ssize_t)-1;
}
if (!use_router_alert && sock->can_send_data)
pgm_mutex_lock (&sock->send_mutex);
ssize_t sent = sendto (send_sock, buf, len, 0, to, (socklen_t)tolen);
pgm_debug ("sendto returned %zd", sent);
if (sent < 0) {
int save_errno = pgm_sock_errno();
if (PGM_UNLIKELY(errno != ENETUNREACH && /* Network is unreachable */
errno != EHOSTUNREACH && /* No route to host */
errno != EAGAIN)) /* would block on non-blocking send */
{
#ifdef CONFIG_HAVE_POLL
/* poll for cleared socket */
struct pollfd p = {
.fd = send_sock,
.events = POLLOUT,
.revents = 0
};
const int ready = poll (&p, 1, 500 /* ms */);
#else
fd_set writefds;
FD_ZERO(&writefds);
FD_SET(send_sock, &writefds);
struct timeval tv = {
.tv_sec = 0,
.tv_usec = 500 /* ms */ * 1000
};
const int ready = select (1, NULL, &writefds, NULL, &tv);
#endif /* CONFIG_HAVE_POLL */
if (ready > 0)
{
sent = sendto (send_sock, buf, len, 0, to, (socklen_t)tolen);
if ( sent < 0 )
{
save_errno = pgm_sock_errno();
pgm_warn (_("sendto() %s failed: %s"),
inet_ntoa( ((const struct sockaddr_in*)to)->sin_addr ),
pgm_sock_strerror (save_errno));
}
}
else if (ready == 0)
{
pgm_warn (_("sendto() %s failed: socket timeout."),
inet_ntoa( ((const struct sockaddr_in*)to)->sin_addr ));
}
else
{
save_errno = pgm_sock_errno();
pgm_warn (_("blocked socket failed: %s"),
pgm_sock_strerror (save_errno));
}
}
}
if (!use_router_alert && sock->can_send_data)
pgm_mutex_unlock (&sock->send_mutex);
return sent;
}
/* socket helper, for setting pipe ends non-blocking
*
* on success, returns 0. on error, returns -1, and sets errno appropriately.
*/
int
pgm_set_nonblocking (
int fd[2]
)
{
/* pre-conditions */
pgm_assert (fd[0]);
pgm_assert (fd[1]);
pgm_sockaddr_nonblocking (fd[0], TRUE);
pgm_sockaddr_nonblocking (fd[1], TRUE);
return 0;
}
/* eof */
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