1 /******************************************************************************
3 This program is free software; you can redistribute it and/or modify
4 it under the terms of the GNU General Public License as published by
5 the Free Software Foundation; either version 2 of the License, or
6 (at your option) any later version.
8 This program is distributed in the hope that it will be useful,
9 but WITHOUT ANY WARRANTY; without even the implied warranty of
10 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
11 GNU General Public License for more details.
13 You should have received a copy of the GNU General Public License
14 along with this program; if not, write to the Free Software
15 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
17 ******************************************************************************/
19 #include "common.h"
20 #include "netutils.h"
21 #include "utils.h"
23 const char *progname = "check_ssh";
24 const char *revision = "$Revision$";
25 const char *copyright = "2000-2003";
26 const char *email = "nagiosplug-devel@lists.sourceforge.net";
28 #ifndef MSG_DONTWAIT
29 #define MSG_DONTWAIT 0
30 #endif
32 #define SSH_DFL_PORT 22
33 #define BUFF_SZ 256
35 int port = -1;
36 char *server_name = NULL;
37 int verbose = FALSE;
39 int process_arguments (int, char **);
40 int validate_arguments (void);
41 void print_help (void);
42 void print_usage (void);
44 int ssh_connect (char *haddr, int hport);
46 int
47 main (int argc, char **argv)
48 {
49 int result;
51 setlocale (LC_ALL, "");
52 bindtextdomain (PACKAGE, LOCALEDIR);
53 textdomain (PACKAGE);
55 if (process_arguments (argc, argv) == ERROR)
56 usage (_("Could not parse arguments\n"));
58 /* initialize alarm signal handling */
59 signal (SIGALRM, socket_timeout_alarm_handler);
60 alarm (socket_timeout);
62 /* ssh_connect exits if error is found */
63 result = ssh_connect (server_name, port);
65 alarm (0);
67 return (result);
68 }
71 /* process command-line arguments */
72 int
73 process_arguments (int argc, char **argv)
74 {
75 int c;
77 int option = 0;
78 static struct option longopts[] = {
79 {"help", no_argument, 0, 'h'},
80 {"version", no_argument, 0, 'V'},
81 {"host", required_argument, 0, 'H'},
82 {"port", required_argument, 0, 'p'},
83 {"use-ipv4", no_argument, 0, '4'},
84 {"use-ipv6", no_argument, 0, '6'},
85 {"timeout", required_argument, 0, 't'},
86 {"verbose", no_argument, 0, 'v'},
87 {0, 0, 0, 0}
88 };
90 if (argc < 2)
91 return ERROR;
93 for (c = 1; c < argc; c++)
94 if (strcmp ("-to", argv[c]) == 0)
95 strcpy (argv[c], "-t");
97 while (1) {
98 c = getopt_long (argc, argv, "+Vhv46t:H:p:", longopts, &option);
100 if (c == -1 || c == EOF)
101 break;
103 switch (c) {
104 case '?': /* help */
105 usage ("");
106 case 'V': /* version */
107 print_revision (progname, revision);
108 exit (STATE_OK);
109 case 'h': /* help */
110 print_help ();
111 exit (STATE_OK);
112 case 'v': /* verose */
113 verbose = TRUE;
114 break;
115 case 't': /* timeout period */
116 if (!is_integer (optarg))
117 usage (_("Timeout Interval must be an integer!\n\n"));
118 else
119 socket_timeout = atoi (optarg);
120 break;
121 case '4':
122 address_family = AF_INET;
123 break;
124 case '6':
125 #ifdef USE_IPV6
126 address_family = AF_INET6;
127 #else
128 usage (_("IPv6 support not available\n"));
129 #endif
130 break;
131 case 'H': /* host */
132 if (is_host (optarg) == FALSE)
133 usage ("Invalid hostname/address\n");
134 server_name = optarg;
135 break;
136 case 'p': /* port */
137 if (is_intpos (optarg)) {
138 port = atoi (optarg);
139 }
140 else {
141 printf ("Port number nust be a positive integer: %s\n", optarg);
142 usage ("");
143 }
144 }
146 }
148 c = optind;
149 if (server_name == NULL && c < argc) {
150 if (is_host (argv[c])) {
151 server_name = argv[c++];
152 }
153 }
155 if (port == -1 && c < argc) {
156 if (is_intpos (argv[c])) {
157 port = atoi (argv[c++]);
158 }
159 else {
160 print_usage ();
161 exit (STATE_UNKNOWN);
162 }
163 }
165 return validate_arguments ();
166 }
168 int
169 validate_arguments (void)
170 {
171 if (server_name == NULL)
172 return ERROR;
173 if (port == -1) /* funky, but allows -p to override stray integer in args */
174 port = SSH_DFL_PORT;
175 return OK;
176 }
179 /************************************************************************
180 *
181 * Try to connect to SSH server at specified server and port
182 *
183 *-----------------------------------------------------------------------*/
185 int
186 ssh_connect (char *haddr, int hport)
187 {
188 int sd;
189 int result;
190 char *output = NULL;
191 char *buffer = NULL;
192 char *ssh_proto = NULL;
193 char *ssh_server = NULL;
194 char rev_no[20];
196 sscanf ("$Revision$", "$Revision: %[0123456789.]", rev_no);
198 result = my_tcp_connect (haddr, hport, &sd);
200 if (result != STATE_OK)
201 return result;
203 output = (char *) malloc (BUFF_SZ + 1);
204 memset (output, 0, BUFF_SZ + 1);
205 recv (sd, output, BUFF_SZ, 0);
206 if (strncmp (output, "SSH", 3)) {
207 printf (_("Server answer: %s"), output);
208 exit (STATE_CRITICAL);
209 }
210 else {
211 strip (output);
212 if (verbose)
213 printf ("%s\n", output);
214 ssh_proto = output + 4;
215 ssh_server = ssh_proto + strspn (ssh_proto, "-0123456789. ");
216 ssh_proto[strspn (ssh_proto, "0123456789. ")] = 0;
217 printf
218 (_("SSH OK - %s (protocol %s)\n"),
219 ssh_server, ssh_proto);
220 asprintf (&buffer, "SSH-%s-check_ssh_%s\r\n", ssh_proto, rev_no);
221 send (sd, buffer, strlen (buffer), MSG_DONTWAIT);
222 if (verbose)
223 printf ("%s\n", buffer);
224 exit (STATE_OK);
225 }
226 }
228 void
229 print_help (void)
230 {
231 char *myport;
232 asprintf (&myport, "%d", SSH_DFL_PORT);
234 print_revision (progname, revision);
236 printf (_("Copyright (c) 1999 Remi Paulmier <remi@sinfomic.fr>\n"));
237 printf (_(COPYRIGHT), copyright, email);
239 printf (_("Try to connect to SSH server at specified server and port\n\n"));
241 print_usage ();
243 printf (_(UT_HELP_VRSN));
245 printf (_(UT_HOST_PORT), 'p', myport);
247 printf (_(UT_IPv46));
249 printf (_(UT_TIMEOUT), DEFAULT_SOCKET_TIMEOUT);
251 printf (_(UT_VERBOSE));
253 printf (_(UT_SUPPORT));
254 }
256 void
257 print_usage (void)
258 {
259 printf (_("\
260 Usage: %s [-46] [-t <timeout>] [-p <port>] <host>\n"), progname);
261 printf (_(UT_HLP_VRS), progname, progname);
262 }
264 /* end of check_ssh.c */