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Socket.cpp
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Socket.cpp
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/**************************************************************
* This file is part of the MPWide communication library
*
* Written by Derek Groen with thanks going out to Steven Rieder,
* Simon Portegies Zwart, Joris Borgdorff, Hans Blom and Tomoaki Ishiyama.
* for questions, please send an e-mail to:
* djgroennl@gmail.com
* MPWide 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.
*
* MPWide 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 MPWide. If not, see <http://www.gnu.org/licenses/>.
* **************************************************************/
#include "Socket.h"
#include <string.h>
#include <errno.h>
#include <fcntl.h>
#include <iostream>
#include <cstdlib>
#include <stdio.h>
#include <netinet/tcp.h>
#include "mpwide-macros.h"
using namespace std;
Socket::Socket() :
m_sock ( -1 )
{
memset(&m_addr, 0, sizeof( m_addr ));
set_non_blocking(false);
set_no_delay(true);
}
Socket::~Socket()
{
if (is_valid()) {
shutdown(m_sock,SHUT_RDWR);
::close(m_sock);
}
}
bool Socket::create()
{
m_sock = socket ( AF_INET, SOCK_STREAM, 0);
if ( ! is_valid() ) {
LOG_ERR("Failed to create socket.");
return false;
}
int on = 1;
if ( setsockopt ( m_sock, SOL_SOCKET, SO_REUSEADDR, ( const char* ) &on, sizeof ( on ) ) == -1 ) {
LOG_ERR("Failed to set socket option.");
return false;
}
setWin(WINSIZE);
return true;
}
/* Setting a window size. */
void Socket::setWin(int size)
{
if(size > 0) {
setsockopt(m_sock, SOL_SOCKET, SO_SNDBUF, (char *) &size, sizeof(int));
setsockopt(m_sock, SOL_SOCKET, SO_RCVBUF, (char *) &size, sizeof(int));
}
}
void Socket::close()
{
if (is_valid()) {
shutdown(m_sock,SHUT_RDWR);
::close(m_sock);
m_sock = -1;
}
}
bool Socket::bind ( const int port )
{
if ( ! is_valid() )
{
LOG_ERR("bind: Invalid socket. ");
return false;
}
m_addr.sin_family = AF_INET;
m_addr.sin_addr.s_addr = INADDR_ANY;
m_addr.sin_port = htons(port);
int bind_return = ::bind(m_sock, (struct sockaddr *) &m_addr, sizeof (m_addr));
if ( bind_return == -1 )
{
LOG_ERR("bind: Failed to bind.");
return false;
}
return true;
}
bool Socket::listen() const
{
if ( ! is_valid() )
{
LOG_ERR("listen: Invalid socket.");
return false;
}
int listen_return = ::listen ( m_sock, MAXCONNECTIONS );
if ( listen_return == -1 )
{
LOG_ERR("listen failed: " << string(strerror(errno)) << "/" << errno);
return false;
}
#if REPORT_BUFFERSIZES > 0
int tcp_sbuf = 0;
int tcp_rbuf = 0;
socklen_t tcp_srlen = sizeof(tcp_sbuf);
getsockopt(m_sock, SOL_SOCKET, SO_SNDBUF, (char*) &tcp_sbuf, &tcp_srlen);
getsockopt(m_sock, SOL_SOCKET, SO_RCVBUF, (char*) &tcp_rbuf, &tcp_srlen);
cout << "Channel-specific tcp window sizes (send/recv): " << tcp_sbuf << "/" << tcp_rbuf << endl;
#endif
return true;
}
bool Socket::accept()
{
socklen_t addr_length = (socklen_t) sizeof ( m_addr );
int new_m_sock = ::accept ( m_sock, ( sockaddr * ) &m_addr, &addr_length );
::close(m_sock);
m_sock = new_m_sock;
if ( m_sock <= 0 ) {
LOG_ERR("accept failed: " << string(strerror(errno)) << "/" << errno);
return false;
}
else {
set_non_blocking(true);
return true;
}
}
bool Socket::send ( const char* s, long long int size ) const
{
/* args: FD_SETSIZE,writeset,readset,out-of-band sent, timeout*/
int ok = 0;
int count = 0;
size_t bytes_sent = 0;
size_t sendsize = (size_t)size;
while(bytes_sent < size) {
ok = Socket_select(0, m_sock, MPWIDE_SOCKET_RDMASK, 10, 0);
;
if (ok == MPWIDE_SOCKET_WRMASK) {
count = 0;
ssize_t status = ::send(m_sock, s+bytes_sent, sendsize-bytes_sent, tcp_send_flag);
if ( status == -1 ) {
LOG_ERR("Socket.send error. Details: " << errno << "/" << strerror(errno));
return false;
}
bytes_sent += status;
}
else {
usleep(50000);
#if REPORT_BUFFERSIZES > 0
cout << "s";
#endif
if(ok<0) {
LOG_ERR("Socket error: " << ok << ", " << strerror(errno));
#if EXIT_ON_SENDRECV_ERROR == 1
exit(1);
#else
return false;
#endif
}
}
if(++count > 5) {
cerr << "Send timeout: " << errno << " / " << strerror(errno) << endl;
count = 0;
break;
}
}
return true;
}
int Socket::recv ( char* s, long long int size ) const
{
int ok = 0;
int count = 0;
size_t bytes_recv = 0;
size_t recvsize = (size_t)size;
while(bytes_recv < size) {
ok = Socket_select(m_sock, 0, MPWIDE_SOCKET_WRMASK, 10, 0);
if (ok == MPWIDE_SOCKET_RDMASK) {
ssize_t status = ::recv( m_sock, s + bytes_recv, recvsize - bytes_recv, 0 );
bytes_recv -= status;
if ( status <= 0 ) {
cout << "status == " << status << " errno == " << errno << " in Socket::recv\n";
cout << strerror(errno) << endl;
return -1;
}
count = 0;
}
else {
if(ok < 0) {
LOG_ERR("Socket error: " << ok << ", " << strerror(errno));
#if EXIT_ON_SENDRECV_ERROR == 1
exit(1);
#else
return -1;
#endif
} else {
usleep(50000);
cout << "r";
if(++count == 1) {
LOG_ERR("Recv timeout: " << errno << " / " << strerror(errno));
LOG_ERR("We will keep trying to receive for a while...");
}
else if (count == 100) { /* Too many problems to get a socket. Let's just consider this receive to have failed. */
return -1;
}
}
}
}
return size;
}
int Socket::irecv ( char* s, long long int size ) const
{
int status = ::recv ( m_sock, s, size, 0 );
#if LOG_LVL >= LVL_ERR || EXIT_ON_SENDRECV_ERROR == 1
if ( status <= 0 ) {
#if LOG_LVL >= LVL_ERR
if (status == 0) {
cout << "irecv: connection reset by peer.status = " << status << " errno = " << errno << "/" << strerror(errno) << endl;
} else {
cout << "irecv: status = " << status << " errno = " << errno << "/" << strerror(errno) << endl;
}
#endif
#if EXIT_ON_SENDRECV_ERROR == 1
exit(1);
#endif
}
#endif
return status;
}
int Socket::isend ( const char* s, long long int size ) const
{
int status = ::send ( m_sock, s, size, tcp_send_flag );
#if LOG_LVL >= LVL_ERR || EXIT_ON_SENDRECV_ERROR == 1
if ( status < 0 ) {
LOG_ERR("isend: status = " << status << " errno = " << errno << "/"<< strerror(errno));
#if EXIT_ON_SENDRECV_ERROR == 1
exit(1);
#endif
}
#endif
return status;
}
/*
Returns:
-1 on error
0 if no access.
MPWIDE_SOCKET_RDMASK if read.
MPWIDE_SOCKET_WRMASK if write.
MPWIDE_SOCKET_RDMASK|MPWIDE_SOCKET_WRMASK if both.
int mask is...
0 if we check for read & write.
MPWIDE_SOCKET_RDMASK if we check for write only.
MPWIDE_SOCKET_WRMASK if we check for read only.
*/
int Socket::select_me (int mask) const
{
return select_me (mask, 10, 0);
}
int Socket::select_me (int mask, int timeout_val) const
{
return select_me(mask, timeout_val, 0);
}
int Socket::select_me (int mask, int timeout_s, int timeout_u) const
{
return Socket_select(m_sock, m_sock, mask, timeout_s, timeout_u);
}
bool Socket::connect ( const string host, const int port )
{
if ( ! is_valid() ) return false;
m_addr.sin_family = AF_INET;
m_addr.sin_port = htons ( port );
int status = inet_pton ( AF_INET, host.c_str(), &m_addr.sin_addr );
if ( status < 1 ) {
#if REPORT_ERRORS > 0
cerr << "Could not convert address'" << host << "': " << string(strerror(errno)) << "/" << errno << endl;
#endif
return false;
}
socklen_t sz = sizeof(m_addr);
status = ::connect(m_sock, (struct sockaddr *) &m_addr, sz);
if(status == -1) {
LOG_ERR("Could not connect to port: " << string(strerror(errno)) << "/" << errno);
return false;
}
set_non_blocking(true);
int write = select_me(MPWIDE_SOCKET_RDMASK,10);
#if REPORT_BUFFERSIZES > 0
int tcp_sbuf = 0;
int tcp_rbuf = 0;
socklen_t tcp_srlen = sizeof(tcp_sbuf);
getsockopt(m_sock, SOL_SOCKET, SO_SNDBUF, (char*) &tcp_sbuf, &tcp_srlen);
getsockopt(m_sock, SOL_SOCKET, SO_RCVBUF, (char*) &tcp_rbuf, &tcp_srlen);
cout << "Channel-specific tcp window sizes (send/recv): " << tcp_sbuf << "/" << tcp_rbuf << endl;
#endif
int error_buf = 0;
socklen_t err_len = sizeof(error_buf);
getsockopt(m_sock, SOL_SOCKET, SO_ERROR, (char*) &error_buf, &err_len);
if(write>0 && error_buf<1) {
LOG_INFO("socket is connected! " << error_buf);
return true;
}
else {
LOG_ERR("socket is NOT connected! " << error_buf);
return false;
}
}
void Socket::set_no_delay(const bool no_delay)
{
int state = no_delay ? 1 : 0;
setsockopt(m_sock, IPPROTO_TCP, TCP_NODELAY, &state, sizeof(state));
}
void Socket::set_non_blocking ( const bool b )
{
int opts;
opts = fcntl (m_sock, F_GETFL);
if(opts < 0) return;
if(b) {
opts = ( opts | O_NONBLOCK );
}
else {
opts = ( opts & ~O_NONBLOCK );
}
fcntl(m_sock, F_SETFL, opts);
}
/**
Returns:
-1 on error
0 if no access.
MPWIDE_SOCKET_RDMASK if read.
MPWIDE_SOCKET_WRMASK if write.
MPWIDE_SOCKET_RDMASK|MPWIDE_SOCKET_WRMASK if both.
int mask is...
0 if we check for read & write.
MPWIDE_SOCKET_RDMASK if we check for write only.
MPWIDE_SOCKET_WRMASK if we check for read only.
*/
int Socket_select(int rs, int ws, int mask, int timeout_s, int timeout_u)
{
struct timeval timeout;
timeout.tv_sec = timeout_s;
timeout.tv_usec = timeout_u;
fd_set *rsock = 0, *wsock = 0;
fd_set rfd, wfd;
if ((mask&MPWIDE_SOCKET_RDMASK) != MPWIDE_SOCKET_RDMASK) {
rsock = (fd_set *)&rfd;
FD_ZERO(rsock);
FD_SET(rs,rsock);
}
if ((mask&MPWIDE_SOCKET_WRMASK) != MPWIDE_SOCKET_WRMASK) {
wsock = (fd_set *)&wfd;
FD_ZERO(wsock);
FD_SET(ws,wsock);
}
/* args: FD_SETSIZE,writeset,readset,out-of-band sent, timeout*/
const int ok = select(max(rs, ws)+1, rsock, wsock, (fd_set *)0, &timeout);
if(ok > 0) {
return (rsock && FD_ISSET(rs,rsock) ? MPWIDE_SOCKET_RDMASK : 0)
| (wsock && FD_ISSET(ws,wsock) ? MPWIDE_SOCKET_WRMASK : 0);
} else if (ok == 0 || errno == EINTR) { // Interruptions don't matter
return 0;
} else {
LOG_ERR("select_me: " << strerror(errno) << "/" << errno);
return -1;
}
}