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/*
** ZabbixW32 - Win32 agent for Zabbix
** Copyright (C) 2002 Victor Kirhenshtein
**
** 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., 675 Mass Ave, Cambridge, MA 02139, USA.
**
** $module: comm.cpp
**
**/
#include "zabbixw32.h"
//
// Request structure
//
struct REQUEST
{
char cmd[MAX_ZABBIX_CMD_LEN];
char result[MAX_STRING_LEN];
};
//
// Global data
//
double statAcceptedRequests=0;
double statRejectedRequests=0;
double statTimedOutRequests=0;
double statAcceptErrors=0;
//
// Validates server's address
//
static BOOL IsValidServerAddr(DWORD addr)
{
DWORD i;
for(i=0;i<confServerCount;i++)
if (addr==confServerAddr[i])
return TRUE;
return FALSE;
}
//
// Request processing thread
//
static unsigned int __stdcall ProcessingThread(void *arg)
{
TlsSetValue(dwTlsLogPrefix,"ProcessingThread: ");
ProcessCommand(((REQUEST *)arg)->cmd,((REQUEST *)arg)->result);
return 0;
}
//
// Client communication thread
//
static void CommThread(void *param)
{
SOCKET sock;
int rc;
REQUEST rq;
struct timeval timeout;
FD_SET rdfs;
HANDLE hThread=NULL;
unsigned int tid;
TlsSetValue(dwTlsLogPrefix,"CommThread: "); // Set log prefix for communication thread
sock=(SOCKET)param;
// Wait for command from server
FD_ZERO(&rdfs);
FD_SET(sock,&rdfs);
timeout.tv_sec=COMMAND_TIMEOUT;
timeout.tv_usec=0;
if (select(sock+1,&rdfs,NULL,NULL,&timeout)==0)
{
WriteLog(MSG_COMMAND_TIMEOUT,EVENTLOG_WARNING_TYPE,NULL);
goto end_session;
}
rc=recv(sock,rq.cmd,MAX_ZABBIX_CMD_LEN,0);
if (rc<=0)
{
WriteLog(MSG_RECV_ERROR,EVENTLOG_ERROR_TYPE,"s",strerror(errno));
goto end_session;
}
rq.cmd[rc-1]=0;
hThread=(HANDLE)_beginthreadex(NULL,0,ProcessingThread,(void *)&rq,0,&tid);
if (WaitForSingleObject(hThread,confTimeout)==WAIT_TIMEOUT)
{
strcpy(rq.result,"ZBX_ERROR\n");
WriteLog(MSG_REQUEST_TIMEOUT,EVENTLOG_WARNING_TYPE,"s",rq.cmd);
statTimedOutRequests++;
}
send(sock,rq.result,strlen(rq.result),0);
// Terminate session
end_session:
shutdown(sock,2);
closesocket(sock);
// Now wait for processing thread completion if we start one
if (hThread!=NULL)
{
WaitForSingleObject(hThread,INFINITE);
CloseHandle(hThread);
}
}
//
// TCP/IP Listener
//
void ListenerThread(void *)
{
SOCKET sock,sockClient;
struct sockaddr_in servAddr;
int iSize,errorCount=0;
TlsSetValue(dwTlsLogPrefix,"Listener: "); // Set log prefix for listener thread
// Create socket
if ((sock=socket(AF_INET,SOCK_STREAM,0))==-1)
{
WriteLog(MSG_SOCKET_ERROR,EVENTLOG_ERROR_TYPE,"e",WSAGetLastError());
exit(1);
}
// Fill in local address structure
memset(&servAddr,0,sizeof(struct sockaddr_in));
servAddr.sin_family=AF_INET;
servAddr.sin_addr.s_addr=htonl(INADDR_ANY);
servAddr.sin_port=htons(confListenPort);
// Bind socket
if (bind(sock,(struct sockaddr *)&servAddr,sizeof(struct sockaddr_in))!=0)
{
WriteLog(MSG_BIND_ERROR,EVENTLOG_ERROR_TYPE,"e",WSAGetLastError());
exit(1);
}
// Set up queue
listen(sock,SOMAXCONN);
// Wait for connection requests
while(1)
{
iSize=sizeof(struct sockaddr_in);
if ((sockClient=accept(sock,(struct sockaddr *)&servAddr,&iSize))==-1)
{
int error=WSAGetLastError();
if (error!=WSAEINTR)
WriteLog(MSG_ACCEPT_ERROR,EVENTLOG_ERROR_TYPE,"e",error);
errorCount++;
statAcceptErrors++;
if (errorCount>1000)
{
WriteLog(MSG_TOO_MANY_ERRORS,EVENTLOG_WARNING_TYPE,NULL);
errorCount=0;
}
Sleep(500);
}
errorCount=0; // Reset consecutive errors counter
if (IsValidServerAddr(servAddr.sin_addr.S_un.S_addr))
{
statAcceptedRequests++;
_beginthread(CommThread,0,(void *)sockClient);
}
else // Unauthorized connection
{
statRejectedRequests++;
shutdown(sockClient,2);
closesocket(sockClient);
}
}
}
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