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/*
* check_ssh.c
*
* Made by (Remi PAULMIER)
* Login <remi@sinfomic.fr>
*
* Started on Fri Jul 9 09:18:23 1999 Remi PAULMIER
* Update Thu Jul 22 12:50:04 1999 remi paulmier
* $Id$
*
*/
#include "config.h"
#include "common.h"
#include "netutils.h"
#include "utils.h"
#define PROGNAME "check_ssh"
#define REVISION "$Revision$"
#ifndef MSG_DONTWAIT
#define MSG_DONTWAIT 0
#endif
#define SSH_DFL_PORT 22
#define BUFF_SZ 256
short port = -1;
char *server_name = NULL;
int verbose = FALSE;
int process_arguments (int, char **);
int validate_arguments (void);
void print_help (void);
void print_usage (void);
char *ssh_resolve (char *hostname);
int ssh_connect (char *haddr, short hport);
int
main (int argc, char **argv)
{
if (process_arguments (argc, argv) == ERROR)
usage ("Could not parse arguments\n");
/* initialize alarm signal handling */
signal (SIGALRM, socket_timeout_alarm_handler);
alarm (socket_timeout);
/* ssh_connect exits if error is found */
ssh_connect (ssh_resolve (server_name), port);
alarm (0);
return (STATE_OK);
}
/* process command-line arguments */
int
process_arguments (int argc, char **argv)
{
int c;
#ifdef HAVE_GETOPT_H
int option_index = 0;
static struct option long_options[] = {
{"version", no_argument, 0, 'V'},
{"help", no_argument, 0, 'h'},
{"verbose", no_argument, 0, 'v'},
{"timeout", required_argument, 0, 't'},
{"host", required_argument, 0, 'H'},
{0, 0, 0, 0}
};
#endif
if (argc < 2)
return ERROR;
for (c = 1; c < argc; c++)
if (strcmp ("-to", argv[c]) == 0)
strcpy (argv[c], "-t");
while (1) {
#ifdef HAVE_GETOPT_H
c = getopt_long (argc, argv, "+Vhvt:H:p:", long_options, &option_index);
#else
c = getopt (argc, argv, "+Vhvt:H:p:");
#endif
if (c == -1 || c == EOF)
break;
switch (c) {
case '?': /* help */
usage ("");
case 'V': /* version */
print_revision (PROGNAME, REVISION);
exit (STATE_OK);
case 'h': /* help */
print_help ();
exit (STATE_OK);
case 'v': /* verose */
verbose = TRUE;
break;
case 't': /* timeout period */
if (!is_integer (optarg))
usage ("Timeout Interval must be an integer!\n\n");
socket_timeout = atoi (optarg);
break;
case 'H': /* host */
server_name = optarg;
break;
case 'p': /* port */
if (is_intpos (optarg)) {
port = atoi (optarg);
}
else {
printf ("Port number nust be a positive integer: %s\n", optarg);
usage ("");
}
}
}
c = optind;
if (server_name == NULL && argv[c]) {
server_name = argv[c++];
}
else if (port == -1 && argv[c]) {
if (is_intpos (argv[c])) {
port = atoi (argv[c++]);
}
else {
print_usage ();
exit (STATE_UNKNOWN);
}
}
return validate_arguments ();
}
int
validate_arguments (void)
{
if (server_name == NULL)
return ERROR;
if (port == -1) /* funky, but allows -p to override stray integer in args */
port = SSH_DFL_PORT;
return OK;
}
/************************************************************************
*
* Resolve hostname into IP address
*
*-----------------------------------------------------------------------*/
char *
ssh_resolve (char *hostname)
{
struct hostent *host;
host = gethostbyname (hostname);
if (!host) {
herror (hostname);
exit (STATE_CRITICAL);
}
return (host->h_addr);
}
/************************************************************************
*
* Try to connect to SSH server at specified server and port
*
*-----------------------------------------------------------------------*/
int
ssh_connect (char *haddr, short hport)
{
int s;
struct sockaddr_in addr;
int addrlen;
int len;
char *output = NULL;
char *buffer = NULL;
char *ssh_proto = NULL;
char *ssh_server = NULL;
char revision[20];
sscanf ("$Revision$", "$Revision: %[0123456789.]", revision);
addrlen = sizeof (addr);
memset (&addr, 0, addrlen);
addr.sin_port = htons (hport);
addr.sin_family = AF_INET;
bcopy (haddr, (void *) &addr.sin_addr.s_addr, 4);
s = socket (AF_INET, SOCK_STREAM, 0);
if (!s) {
printf ("socket(): %s for %s:%d\n", strerror (errno), server_name, hport);
exit (STATE_CRITICAL);
}
if (connect (s, (struct sockaddr *) &addr, addrlen)) {
printf ("connect(): %s for %s:%d\n", strerror (errno), server_name,
hport);
exit (STATE_CRITICAL);
}
output = (char *) malloc (BUFF_SZ + 1);
memset (output, 0, BUFF_SZ + 1);
recv (s, output, BUFF_SZ, 0);
if (strncmp (output, "SSH", 3)) {
printf ("Server answer: %s", output);
exit (STATE_CRITICAL);
}
else {
strip (output);
if (verbose)
printf ("%s\n", output);
ssh_proto = output + 4;
ssh_server = ssh_proto + strspn (ssh_proto, "-0123456789. ");
ssh_proto[strspn (ssh_proto, "0123456789. ")] = 0;
printf
("SSH ok - %s (protocol %s)\n",
ssh_server, ssh_proto);
asprintf (&buffer, "SSH-%s-check_ssh_%s\r\n", ssh_proto, revision);
send (s, buffer, strlen (buffer), MSG_DONTWAIT);
if (verbose)
printf ("%s\n", buffer);
exit (STATE_OK);
}
}
void
print_help (void)
{
print_revision (PROGNAME, REVISION);
printf ("Copyright (c) 1999 Remi Paulmier (remi@sinfomic.fr)\n\n");
print_usage ();
printf ("by default, port is %d\n", SSH_DFL_PORT);
}
void
print_usage (void)
{
printf
("Usage:\n"
" %s -t [timeout] -p [port] <host>\n"
" %s -V prints version info\n"
" %s -h prints more detailed help\n", PROGNAME, PROGNAME, PROGNAME);
}
/* end of check_ssh.c */
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