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server.c
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server.c
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/*
* Copyright (C) 2020 Thomas Steger
*
* 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 2
* 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, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
* Or, point your browser to http://www.gnu.org/licenses/old-licenses/gpl-2.0.html
*/
#include <stdio.h>
#include <stdlib.h>
#include <cstring>
#include <errno.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netdb.h>
#include <arpa/inet.h>
#include <unistd.h>
#include "server.h"
#include "common.h"
#include "mttp.h"
cServer::cServer(int port)
{
//mttp = new cMTTP(eNone);
mttpheartbeat.InitBuffer(eHeartbeat);
connected = false;
settimeout(true);
sock1 = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
if (sock1 < 0)
{
LOG("Error Creating Server Socket: %s\n", strerror(errno));
exit (0);
}
const int y = 1;
setsockopt(sock1, SOL_SOCKET, SO_REUSEADDR, &y, sizeof(int));
memset (&server, 0, sizeof (server));
server.sin_family = AF_INET;
server.sin_addr.s_addr = htonl(INADDR_ANY);
server.sin_port = htons(port);
if(bind(sock1,(struct sockaddr*)&server, sizeof( server)) < 0)
{
LOG("Error Bind Server Socket to port %s\n", strerror(errno));
exit (0);
}
if(listen(sock1, 5) == -1 )
{
LOG("Error Listen on Server Socket: %s\n", strerror(errno));
exit (0);
}
}
cServer::~cServer()
{
closeconnection();
close (sock1);
}
int cServer::waitclient()
{
int rv;
fd_set set;
struct timeval timeout;
FD_ZERO(&set);
FD_SET(sock1, &set);
timeout.tv_sec = 0;
timeout.tv_usec = 500000;
rv = select(sock1 + 1, &set, NULL, NULL, &timeout);
if(rv == -1)
{
LOG("Error on Select\n"); /* an error accured */
return -1;
}
else if(rv == 0)
{
//DEBUGLOG("cSERVER::action: Select() timeout occurred\n"); /* a timeout occured */
return 0;
}
else
{
len = sizeof(client);
sock2 = accept(sock1, (struct sockaddr*)&client, &len);
if (sock2 < 0)
{
LOG("Error Socket accept: %s\n", strerror(errno));
}
connected = true;
settimeout(true);
return 1;
}
}
bool cServer::stillconnected()
{
if (!connected)
return false;
uint8_t sendbuffer[MAX_SEND_BUFFER];
int sendbufferlen = mttpheartbeat.GetBuffer(sendbuffer, MAX_SEND_BUFFER);
if (send(sock2, sendbuffer, sendbufferlen) < 0)
{
LOG("cServer::stillconnected: Error Sending Heartbeat Message to Client\n");
return false;
}
else
return true;
}
void cServer::closeconnection()
{
if (connected && (sock2 > -1))
{
close(sock2);
sock2 = -1;
connected = false;
}
}
void cServer::settimeout(bool reset)
{
if (!reset)
{
Now = time(NULL);
if (Now - LastClientMessage > CONNECTTIMEOUT)
{
if (!stillconnected())
{
needreconnect = true;
}
else
{
needreconnect = false;
LastClientMessage = time(NULL);
}
}
}
else
{
LastClientMessage = time(NULL);
needreconnect = false;
}
}
int cServer::send(int sock, const uint8_t *data, int len)
{
int sendcnt = 0;
int sendret = 0;
int sendlen = len;
while (sendcnt < len)
{
sendret = ::send(sock, &data[sendcnt], sendlen, 0);
//printf("%d Bytes send\n", sendret);
if (sendret <= 0)
{
LOG("Error sending Data: %s\n", strerror(errno));
return -1;
}
sendcnt = sendcnt + sendret;
sendlen = sendlen - sendret;
}
return sendcnt;
}
int cServer::recv(int sock, uint8_t *data, int len)
{
int recvret = 0;
recvret = ::recv(sock, data, len, 0);
if (recvret == -1)
{
LOG("Error Receiving Data: %s\n", strerror(errno));
}
return recvret;
}
int cServer::action()
{
if (needreconnect && connected)
{
LOG("cServer::action: Need Reconnect No Connectin to Client\n");
closeconnection();
}
if (!connected)
{
if (waitclient() < 1)
{
return 0;
}
}
if (connected)
{
// LOG("I am Connected!\n");
int rv;
fd_set set;
struct timeval timeout;
FD_ZERO(&set);
FD_SET(sock2, &set);
timeout.tv_sec = 0;
timeout.tv_usec = 500000;
rv = select(sock2 + 1, &set, NULL, NULL, &timeout);
if(rv == -1)
{
LOG("cServer::action: Error on Select\n"); /* an error accured */
return -1;
}
else if(rv == 0)
{
// DEBUGLOG("cSERVER::action: Select() timeout occurred\n"); /* a timeout occured */
settimeout(false); // No Data check for Timout
return 0;
}
else
{
// len = sizeof(client);
// sock2 = accept(sock1, (struct sockaddr*)&client, &len);
// if (sock2 < 0)
// {
// LOG("Error Socket accept: %s\n", strerror(errno));
// }
int received = recv(sock2, recvbuffer, RECVBUFSIZE);
if (received <= 0)
{
DEBUGLOG("cServer::action: 0 Bytes Received: Client closed Connection Close Socket\n");
closeconnection();
return 0;
}
settimeout(true); //Data received Reset Timeout Timer
int processed = 0;
data memtype;
uint16_t startadress;
uint8_t command[COMMAND_SIZE];
int commandret;
int saveret;
DEBUGLOG("Daten empfangen: %d\n", received);
int n = 0, m = 0;
for (n = 0; n<MAXDECODINGLOOPS; n++)
{
if (processed < received)
{
processed = mttp.AddMessage((recvbuffer + processed), (received - processed));
DEBUGLOG("cMTTP: %d bytes processed\n", processed);
for (m = 0; m < MAX_COMMANDS; m++)
{
memtype = eNotSet;
startadress = 0;
commandret = 0;
std::memset(command, 0, COMMAND_SIZE);
commandret = mttp.GetCommand(&memtype, &startadress, command, COMMAND_SIZE, m);
if (commandret < 0)
break;
else if (commandret == 0)
continue;
else
{
saveret = memory.Save(memtype, startadress, commandret, command);
if (saveret < 0)
{
LOG("cServer::action: Error Save Registers\n");
}
else
{
DEBUGLOG("cServer::action: %d Registers Saved\n", saveret);
}
}
}
}
else
{
break;
}
}
// printf("\n");
// close(sock2);
}
}
return 1;
}