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Web Server Monitoring Software
类型: Full Script	类别: UNIX Admin
许可证: GNU General Public License	语言: C
描述: This Unix C code monitors a web server every few minutes by trying to retrieve its home page. It sends you email when it can't connect, and every so often while the server is still down. It sends a final message when it comes back up. If you have email paging, just direct the email to your pager address.

该代码片段的版本系列:

片段ID	下载版本	提交时间	提交人	删除
10	0.1	2001-07-26 13:32	bbsadmin

点击"下载版本"来下载该代码片段.

最新版本的代码片段: 0.1

/*
 by Network Wizards, 1995  (www.nw.com)

 webcheck servername mailaddr

 every minute,
   sends GET / HTTP/1.0 to server, port 80
   reads response
   if no answer, calls pmail to send a page
*/

#include <stdio.h>
#include <unistd.h>
#include <string.h>
#include <fcntl.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netdb.h>
#include <sys/time.h>
#include <signal.h>
#include <sys/param.h>
#include <sys/ioctl.h>

#define FALSE 0
#define TRUE  1

#define	PORT            80

#define	MAXTMPLEN	128	/* max length of tmp array declared below */

#define BUFLEN  256
char buf[BUFLEN];


struct hostent *hp;
int skt;
FILE *fin, *fout;

struct itimerval tv;

void tout();
char tmp[MAXTMPLEN];
char *mailaddr;

main(argc, argv)
  int argc;
  char *argv[];
{
  int i, c, down;

  /* punt if syntax is wrong */
  if (argc != 3)
  {
    fprintf(stderr,"usage: wwwtest server email\n");
    exit(1);
  }
  if ((hp = gethostbyname(argv[1])) == NULL)
  {
    fprintf(stderr,"can't find host '%s'.\n",argv[1]);
    exit(1);
  }
  mailaddr = argv[2];

  if (fork())
    exit(0);
  for (i = 10; i >= 0; i--)
    (void) close(i);
  (void) open("/dev/null", O_RDONLY);
  (void) dup2(0, 1);
  (void) dup2(0, 2);
  i = open("/dev/tty", O_RDWR);
  if (i > 0)
    {
    (void) ioctl(i, TIOCNOTTY, (char *)NULL);
    (void) close(i);
  }

  signal(SIGALRM,tout);

  down = FALSE;
  for (;;)
  {
    if (checkserver())     /* if server up */
    {
      if (down)
	notify("up",argv[1]);
      down = FALSE;
      sleep(60);
      continue;
    }
    /* if server down */
    sleep(5*60);
    if (checkserver())   /* try once more */
    {
      sleep(60);
      continue;
    }
    notify("down",argv[1]);
    down = TRUE;
    sleep(3*60);
  }
}

checkserver()
{
  struct sockaddr_in sin;
  u_long addr;

  tv.it_interval.tv_sec  = 0;
  tv.it_interval.tv_usec = 0;
  tv.it_value.tv_sec     = 30;
  tv.it_value.tv_usec    = 0;
  setitimer(ITIMER_REAL,&tv,NULL);

  /* create a socket */
  if ((skt = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP)) < 0)
  {
    cancel_timeout();
    return(FALSE);
  }

  sin.sin_family = hp->h_addrtype;
  bcopy (hp->h_addr, &sin.sin_addr, hp->h_length);
  addr = ntohl(sin.sin_addr.s_addr);
  sin.sin_port = htons(80);

  /* Now, connect to that port */
  if (connect(skt, (struct sockaddr *) &sin, sizeof(sin)) < 0)
  {
    close(skt);
    cancel_timeout();
    return(FALSE);
  }

  /* associate a STREAM to 'fin' and 'fout' from 'skt' */
  if ((fin = fdopen(skt, "r")) == NULL ||
      (fout = fdopen(skt, "w")) == NULL)
  {
    close(skt);
    cancel_timeout();
    return(FALSE);
  }

  /* write out the request to the server (remember to terminate 
   * with <return><newline>).
   */
  fprintf(fout, "GET / HTTP/1.0\r\n\r\n");
  fflush(fout);

  /* read back results */
  while (fgets(buf,BUFLEN,fin) != NULL)
  {
    if (!strncasecmp(buf,"HTTP/1.0 200 OK",15))
    {
      fclose(fin); fclose(fout);
      close(skt);
      cancel_timeout();
      return(TRUE);
    }
    if (*buf == '\r') break;
    if (*buf == '\n') break;
  }
  fclose(fin); fclose(fout);
  close(skt);
  cancel_timeout();
  return(FALSE);
}

cancel_timeout()
{
  tv.it_interval.tv_sec  = 0;
  tv.it_interval.tv_usec = 0;
  tv.it_value.tv_sec     = 0;
  tv.it_value.tv_usec    = 0;
  setitimer(ITIMER_REAL,&tv,NULL);
}

void tout()
{
  fclose(fin); fclose(fout);
  close(skt);
  skt = -1;
}

notify(msg,server)
  char *msg, *server;
{
  char buf[256];

  sprintf(buf,"echo \"%s : %s\" | /usr/bin/Mail %s",
	  msg,server,mailaddr);
  system(buf);
}

		

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