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* Nagios check_radius plugin
* License: GPL
* Copyright (c) 1999-2008 Nagios Plugins Development Team
* Description:
* This file contains the check_radius plugin
* Tests to see if a radius server is accepting connections.
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* GNU General Public License for more details.
* You should have received a copy of the GNU General Public License
* along with this program.  If not, see <http://www.gnu.org/licenses/>.

const char *progname = "check_radius";
const char *copyright = "2000-2008";
const char *email = "nagiosplug-devel@lists.sourceforge.net";

#include "common.h"
#include "utils.h"
#include "netutils.h"

#include <radiusclient-ng.h>
rc_handle *rch = NULL;
#include <radiusclient.h>

int process_arguments (int, char **);
void print_help (void);
void print_usage (void);

/* libradiusclient(-ng) wrapper functions */
#define my_rc_conf_str(a) rc_conf_str(rch,a)
#define my_rc_send_server(a,b) rc_send_server(rch,a,b)
#define my_rc_buildreq(a,b,c,d,e,f) rc_buildreq(rch,a,b,c,d,e,f)
#define my_rc_own_ipaddress() rc_own_ipaddress(rch)
#define my_rc_avpair_add(a,b,c,d) rc_avpair_add(rch,a,b,c,-1,d)
#define my_rc_read_dictionary(a) rc_read_dictionary(rch, a)
#define my_rc_conf_str(a) rc_conf_str(a)
#define my_rc_send_server(a,b) rc_send_server(a, b)
#define my_rc_buildreq(a,b,c,d,e,f) rc_buildreq(a,b,c,d,e,f)
#define my_rc_own_ipaddress() rc_own_ipaddress()
#define my_rc_avpair_add(a,b,c,d) rc_avpair_add(a, b, c, d)
#define my_rc_read_dictionary(a) rc_read_dictionary(a)

/* REJECT_RC is only defined in some version of radiusclient. It has
 * been reported from radiusclient-ng 0.5.6 on FreeBSD 7.2-RELEASE */
#ifndef REJECT_RC

int my_rc_read_config(char *);

char *server = NULL;
char *username = NULL;
char *password = NULL;
char *nasid = NULL;
char *nasipaddress = NULL;
char *expect = NULL;
char *config_file = NULL;
unsigned short port = PW_AUTH_UDP_PORT;
int retries = 1;
int verbose = FALSE;
ENV *env = NULL;


The (psuedo?)literate programming XML is contained within \@\@\- <XML> \-\@\@
tags in the comments. With in the tags, the XML is assembled sequentially.
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<title>Quick Reference</title>
<!-- The refentry forms a manpage -->


<title>Theory, Installation, and Operation</title>

<title>General Description</title>

<title>Future Enhancements</title>
<para>Todo List</para>
<listitem>Add option to get password from a secured file rather than the command line</listitem>


main (int argc, char **argv)
      UINT4 service;
      char msg[BUFFER_LEN];
      SEND_DATA data;
      int result = STATE_UNKNOWN;
      UINT4 client_id;
      char *str;

      setlocale (LC_ALL, "");
      bindtextdomain (PACKAGE, LOCALEDIR);
      textdomain (PACKAGE);

      /* Parse extra opts if any */
      argv=np_extra_opts (&argc, argv, progname);

      if (process_arguments (argc, argv) == ERROR)
            usage4 (_("Could not parse arguments"));

      str = strdup ("dictionary");
      if ((config_file && my_rc_read_config (config_file)) ||
                  my_rc_read_dictionary (my_rc_conf_str (str)))
            die (STATE_UNKNOWN, _("Config file error"));

      service = PW_AUTHENTICATE_ONLY;

      memset (&data, 0, sizeof(data));
      if (!(my_rc_avpair_add (&data.send_pairs, PW_SERVICE_TYPE, &service, 0) &&
                        my_rc_avpair_add (&data.send_pairs, PW_USER_NAME, username, 0) &&
                        my_rc_avpair_add (&data.send_pairs, PW_USER_PASSWORD, password, 0)
            die (STATE_UNKNOWN, _("Out of Memory?"));

      if (nasid != NULL) {
            if (!(my_rc_avpair_add (&data.send_pairs, PW_NAS_IDENTIFIER, nasid, 0)))
                  die (STATE_UNKNOWN, _("Invalid NAS-Identifier"));

      if (nasipaddress != NULL) {
            if (rc_good_ipaddr (nasipaddress))
                  die (STATE_UNKNOWN, _("Invalid NAS-IP-Address"));
            if ((client_id = rc_get_ipaddr(nasipaddress)) == 0)
                  die (STATE_UNKNOWN, _("Invalid NAS-IP-Address"));
      } else {
            if ((client_id = my_rc_own_ipaddress ()) == 0)
                  die (STATE_UNKNOWN, _("Can't find local IP for NAS-IP-Address"));
      if (my_rc_avpair_add (&(data.send_pairs), PW_NAS_IP_ADDRESS, &client_id, 0) == NULL)
            die (STATE_UNKNOWN, _("Invalid NAS-IP-Address"));

      my_rc_buildreq (&data, PW_ACCESS_REQUEST, server, port, (int)timeout_interval,

      result = my_rc_send_server (&data, msg);
      rc_avpair_free (data.send_pairs);
      if (data.receive_pairs)
            rc_avpair_free (data.receive_pairs);

      if (result == TIMEOUT_RC)
            die (STATE_CRITICAL, _("Timeout"));
      if (result == ERROR_RC)
            die (STATE_CRITICAL, _("Auth Error"));
      if (result == REJECT_RC)
            die (STATE_WARNING, _("Auth Failed"));
      if (result == BADRESP_RC)
            die (STATE_WARNING, _("Bad Response"));
      if (expect && !strstr (msg, expect))
            die (STATE_WARNING, "%s", msg);
      if (result == OK_RC)
            die (STATE_OK, _("Auth OK"));
      (void)snprintf(msg, sizeof(msg), _("Unexpected result code %d"), result);
      die (STATE_UNKNOWN, msg);

/* process command-line arguments */
process_arguments (int argc, char **argv)
      int c;

      int option = 0;
      static struct option longopts[] = {
            {"hostname", required_argument, 0, 'H'},
            {"port", required_argument, 0, 'P'},
            {"username", required_argument, 0, 'u'},
            {"password", required_argument, 0, 'p'},
            {"nas-id", required_argument, 0, 'n'},
            {"nas-ip-address", required_argument, 0, 'N'},
            {"filename", required_argument, 0, 'F'},
            {"expect", required_argument, 0, 'e'},
            {"retries", required_argument, 0, 'r'},
            {"timeout", required_argument, 0, 't'},
            {"verbose", no_argument, 0, 'v'},
            {"version", no_argument, 0, 'V'},
            {"help", no_argument, 0, 'h'},
            {0, 0, 0, 0}

      while (1) {
            c = getopt_long (argc, argv, "+hVvH:P:F:u:p:n:N:t:r:e:", longopts,

            if (c == -1 || c == EOF || c == 1)

            switch (c) {
            case '?':                                                   /* print short usage statement if args not parsable */
                  usage5 ();
            case 'h':                                                   /* help */
                  print_help ();
                  exit (OK);
            case 'V':                                                   /* version */
                  print_revision (progname, NP_VERSION);
                  exit (OK);
            case 'v':                                                   /* verbose mode */
                  verbose = TRUE;
            case 'H':                                                   /* hostname */
                  if (is_host (optarg) == FALSE) {
                        usage2 (_("Invalid hostname/address"), optarg);
                  server = optarg;
            case 'P':                                                   /* port */
                  if (is_intnonneg (optarg))
                        port = atoi (optarg);
                        usage4 (_("Port must be a positive integer"));
            case 'u':                                                   /* username */
                  username = optarg;
            case 'p':                                                   /* password */
                  password = strdup(optarg);

                  /* Delete the password from process list */
                  while (*optarg != '\0') {
                        *optarg = 'X';
            case 'n':                                                   /* nas id */
                  nasid = optarg;
            case 'N':                                                   /* nas ip address */
                  nasipaddress = optarg;
            case 'F':                                                   /* configuration file */
                  config_file = optarg;
            case 'e':                                                   /* expect */
                  expect = optarg;
            case 'r':                                                   /* retries */
                  if (is_intpos (optarg))
                        retries = atoi (optarg);
                        usage4 (_("Number of retries must be a positive integer"));
            case 't':                                                   /* timeout */
                  if (is_intpos (optarg))
                        timeout_interval = atoi (optarg);
                        usage2 (_("Timeout interval must be a positive integer"), optarg);

      if (server == NULL)
            usage4 (_("Hostname was not supplied"));
      if (username == NULL)
            usage4 (_("User not specified"));
      if (password == NULL)
            usage4 (_("Password not specified"));
      if (config_file == NULL)
            usage4 (_("Configuration file not specified"));

      return OK;

print_help (void)
      char *myport;
      asprintf (&myport, "%d", PW_AUTH_UDP_PORT);

      print_revision (progname, NP_VERSION);

      printf ("Copyright (c) 1999 Robert August Vincent II\n");
      printf (COPYRIGHT, copyright, email);

      printf("%s\n", _("Tests to see if a RADIUS server is accepting connections."));

  printf ("\n\n");

      print_usage ();

      printf (UT_HELP_VRSN);
      printf (UT_EXTRA_OPTS);

      printf (UT_HOST_PORT, 'P', myport);

      printf (" %s\n", "-u, --username=STRING");
  printf ("    %s\n", _("The user to authenticate"));
  printf (" %s\n", "-p, --password=STRING");
  printf ("    %s\n", _("Password for autentication (SECURITY RISK)"));
  printf (" %s\n", "-n, --nas-id=STRING");
  printf ("    %s\n", _("NAS identifier"));
  printf (" %s\n", "-N, --nas-ip-address=STRING");
  printf ("    %s\n", _("NAS IP Address"));
  printf (" %s\n", "-F, --filename=STRING");
  printf ("    %s\n", _("Configuration file"));
  printf (" %s\n", "-e, --expect=STRING");
  printf ("    %s\n", _("Response string to expect from the server"));
  printf (" %s\n", "-r, --retries=INTEGER");
  printf ("    %s\n", _("Number of times to retry a failed connection"));

      printf (UT_TIMEOUT, timeout_interval);

  printf ("\n");
  printf ("%s\n", _("This plugin tests a RADIUS server to see if it is accepting connections."));
  printf ("%s\n", _("The server to test must be specified in the invocation, as well as a user"));
  printf ("%s\n", _("name and password. A configuration file may also be present. The format of"));
  printf ("%s\n", _("the configuration file is described in the radiusclient library sources."));
      printf ("%s\n", _("The password option presents a substantial security issue because the"));
  printf ("%s\n", _("password can possibly be determined by careful watching of the command line"));
  printf ("%s\n", _("in a process listing. This risk is exacerbated because nagios will"));
  printf ("%s\n", _("run the plugin at regular predictable intervals. Please be sure that"));
  printf ("%s\n", _("the password used does not allow access to sensitive system resources."));

      printf (UT_SUPPORT);

print_usage (void)
  printf ("%s\n", _("Usage:"));
      printf ("%s -H host -F config_file -u username -p password\n\
                  [-P port] [-t timeout] [-r retries] [-e expect]\n\
                  [-n nas-id] [-N nas-ip-addr]\n", progname);

int my_rc_read_config(char * a)
      rch = rc_read_config(a);
      return (rch == NULL) ? 1 : 0;
      return rc_read_config(a);

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