今天下午偶然看到我的部落格因為一個wp-cron job死了，雖然原因不明但這種死不瞑目的情況從我剛接觸IIS到現在也算是層出不窮啦...

就想說我來寫個程式監控狀況，自動重開死掉的AppPool！耶，你這該死的IIS~~

天啊，你不去讀書還在這裡幹嘛？星期二就要段考了！
我什麼都沒看到~~~~(拖走

程式主要的目的是監控，所以檢查和控制的工作外包給cUrl和AppCmd
由cUrl發送HTTP head要求，只要10秒內網站沒有回應200 OK就由AppCmd進行AppPool關閉、啟動的操作

不過AppCmd取得的網站列表實在很雜亂，所以網站名稱和URL的部分是用手打的所以很Q喔～

編譯好程式後，只要將程式和所需的外包零件放在一起，交給工作排程器去執行就OK啦~
但要記得，設定觸發條件時要把「開始位置」調成程式目錄，並賦予管理員權限喔~

--11/26更新--
加入log和timestamp，以便日後除錯用

--12/3更新--
新增檢查網路狀態，避免無謂的檢查

--1/12更新--
增加cUrl過濾條件

/* This source file is composed using MSVC11,
it may or may not work under your environment. */
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>

int main(void)
{
	int isUp, i, p, netOK, netRetry;
	char logdata[500], buffer[300], sitename[20][300], siteurl[20][300];
	char cUrl[100], appcmd_start[300], appcmd_stop[300], *pch, *next_pch;
	time_t rawtime;
	FILE *pPipe, *siteList, *appCMD, *logfile;

	/* Check network status first */
	for(netRetry=0; netRetry<3; netRetry++)
	{
		if( (pPipe = _popen( "ping 8.8.8.8", "rt" )) == NULL )
		{
			exit(10);
		}
		else
		{
			netOK = 0;
			/* Read pipe until end of file. */
			while( !feof( pPipe ) )
			{
				if( fgets( buffer, 300, pPipe ) != NULL )
				{
					if(strstr(buffer, "(0% 遺失)") != NULL )
					{
						netOK = 1;
						break;
					}
				}
			}
			/* Close pipe of pPipe. */
			_pclose( pPipe );
			if(netOK == 0 && netRetry == 2)
			{
				exit(11);
			}
			else if(netOK == 1)
			{
				break;
			}
		}
	}

	/* Read site list */
	if( fopen_s( &siteList, "sitelist.txt", "r") != 0 )
	{
		exit(1);
	}
	else
	{
		p = 0;
		while(!feof(siteList))
		{
			if( fgets( buffer, 300, siteList ) != NULL )
			{
				pch = strtok_s (buffer, ",\n", &next_pch);
				strcpy_s(sitename[p], pch);
				pch = strtok_s (NULL, ",\n", &next_pch);
				strcpy_s(siteurl[p], pch);
				p++;
			}
		}
		fclose(siteList);
	}

	/* Start detecting website status */
	for( i=0; i<p; i++)
	{
		isUp = 0;
		strcpy_s(cUrl, "curl\\curl.exe -I --connect-timeout 10 ");
		strcat_s(cUrl, siteurl[i]);
		if( (pPipe = _popen( cUrl, "rt" )) == NULL )
		{
			exit(2);
		}
		else
		{
			/* Read pipe until end of file. */
			while( !feof( pPipe ) )
			{
				if( fgets( buffer, 300, pPipe ) != NULL )
				{
					if( strstr(buffer, "200 OK") != NULL ||
					    strstr(buffer, "301 Moved Permanently") != NULL ||
					    strstr(buffer, "302 Moved Temporarily") != NULL ||
					    strstr(buffer, "Host not found") != NULL )
					{
						isUp = 1;
						break;
					}
				}
			}
			/* Close pipe of pPipe. */
			_pclose( pPipe );
		}


		if(isUp == 0)
		{
			strcpy_s(appcmd_start, "%windir%\\system32\\inetsrv\\appcmd start apppool ");
			strcpy_s(appcmd_stop, "%windir%\\system32\\inetsrv\\appcmd stop apppool ");
			strcat_s(appcmd_start, sitename[i]);
			strcat_s(appcmd_stop, sitename[i]);

			if( (appCMD = _popen( appcmd_stop, "rt" )) == NULL )
			{
				exit(3);
			}
			else
			{
				time( &rawtime );
				strcpy_s(logdata, "#~" );
				strcat_s(logdata, asctime( localtime( &rawtime ) ) );
				while(fgets(buffer, 300, appCMD))
				{
					strcat_s(logdata, buffer);
				}
				_pclose( appCMD );

				if( (appCMD = _popen( appcmd_start, "rt" )) == NULL )
				{
					exit(4);
				}
			}

			while(fgets(buffer, 300, appCMD))
			{
				strcat_s(logdata, buffer);
			}
			_pclose( appCMD );
			strcat_s(logdata, "\n" );
			if( fopen_s( &logfile, "logfile.txt", "a+") != 0 )
			{
				exit(5);
			}
			else
			{
				fprintf(logfile, "%s", logdata);
				fclose( logfile );
			}
		}
	}
	return 0;
}