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Re: Monitoring sshd

From: Jan-Henrik Haukeland
Subject: Re: Monitoring sshd
Date: Fri, 14 Nov 2003 18:50:06 +0100
User-agent: Gnus/5.1002 (Gnus v5.10.2) XEmacs/21.4 (Reasonable Discussion, linux)

David Fletcher <address@hidden> writes:

> Looking at the file "protocols/ssh.c" in the Monit distribution reveals
> that whatever identification string the server sends out, Monit sends
> the same thing back.

Hmm, not quite, chomp() strips the ending CRLF. Since it works with
the predefined string (with CRLF) it is a strong indication that the
problem is the missing CRLF in the string sent back to the server.

Does the following (untested) change fix the problem?

int check_ssh(Socket_T s) {

  int n;
  char  buf[STRLEN];

  if((n= socket_read(s, buf, sizeof(buf))) <= 0) {
    log("SSH: error receiving identification string -- %s\n", STRERROR);
    return FALSE;

  if(strncmp(buf, "SSH-", 4) != 0) {
    log("SSH: protocol error %s\n", buf);
    return FALSE;

  /* send identification string back to server */
  if(socket_write(s, buf, n) <= 0) {
    log("SSH: error sending identification string -- %s\n", STRERROR);
    return FALSE;
  return TRUE;

Jan-Henrik Haukeland

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