diff options
Diffstat (limited to 'plugins/check_ssh.c')
| -rw-r--r-- | plugins/check_ssh.c | 285 |
1 files changed, 285 insertions, 0 deletions
diff --git a/plugins/check_ssh.c b/plugins/check_ssh.c new file mode 100644 index 00000000..d78189fc --- /dev/null +++ b/plugins/check_ssh.c @@ -0,0 +1,285 @@ +/* +* 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" + +#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 call_getopt (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; + + if (argc < 2) + return ERROR; + + for (c = 1; c < argc; c++) + if (strcmp ("-to", argv[c]) == 0) + strcpy (argv[c], "-t"); + + c = 0; + while (c += (call_getopt (argc - c, &argv[c]))) { + if (argc <= c) + break; + if (server_name == NULL) { + server_name = argv[c]; + } + else if (port == -1) { + if (is_intpos (argv[c])) { + port = atoi (argv[c]); + } + else { + print_usage (); + exit (STATE_UNKNOWN); + } + } + } + + return validate_arguments (); +} + + +/************************************************************************ +* +* Run the getopt until we encounter a non-option entry in the arglist +* +*-----------------------------------------------------------------------*/ + +int +call_getopt (int argc, char **argv) +{ + int c, i = 1; + +#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 + + 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; + + i++; + switch (c) { + case 't': + case 'H': + case 'p': + i++; + } + + switch (c) { + case '?': /* help */ + usage (""); + case 'V': /* version */ + print_revision (my_basename (argv[0]), "$Revision$"); + 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 (""); + } + } + + } + return i; +} + +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 ("$Revision$", "$Revision: %[0123456789.]", revision); + + addrlen = sizeof (addr); + memset (&addr, 0, addrlen); + addr.sin_port = htons (hport); + addr.sin_family = AF_INET; + bcopy (haddr, (void *) &addr.sin_addr.s_addr, 4); + + s = socket (AF_INET, SOCK_STREAM, 0); + if (!s) { + printf ("socket(): %s for %s:%d\n", strerror (errno), server_name, hport); + exit (STATE_CRITICAL); + } + + if (connect (s, (struct sockaddr *) &addr, addrlen)) { + printf ("connect(): %s for %s:%d\n", strerror (errno), server_name, + hport); + exit (STATE_CRITICAL); + } + + output = (char *) malloc (BUFF_SZ + 1); + memset (output, 0, BUFF_SZ + 1); + recv (s, output, BUFF_SZ, 0); + if (strncmp (output, "SSH", 3)) { + printf ("Server answer: %s", output); + exit (STATE_CRITICAL); + } + else { + strip (output); + if (verbose) + printf ("%s\n", output); + ssh_proto = output + 4; + ssh_server = ssh_proto + strspn (ssh_proto, "0123456789-. "); + ssh_proto[strspn (ssh_proto, "0123456789-. ")] = 0; + printf + ("SSH ok - protocol version %s - server version %s\n", + ssh_proto, ssh_server); + buffer = + ssprintf (buffer, "SSH-%s-check_ssh_%s\r\n", ssh_proto, revision); + send (s, buffer, strlen (buffer), MSG_DONTWAIT); + if (verbose) + printf ("%s\n", buffer); + exit (STATE_OK); + } +} + +void +print_help (void) +{ + print_revision (PROGNAME, "$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 */ |