1 /****************************************************************************
2 *
3 * Nagios plugins network utilities
4 *
5 * License: GPL
6 * Copyright (c) 1999 Ethan Galstad (nagios@nagios.org)
7 *
8 * Last Modified: $Date$
9 *
10 * Description:
11 *
12 * This file contains commons functions used in many of the plugins.
13 *
14 * License Information:
15 *
16 * This program is free software; you can redistribute it and/or modify
17 * it under the terms of the GNU General Public License as published by
18 * the Free Software Foundation; either version 2 of the License, or
19 * (at your option) any later version.
20 *
21 * This program is distributed in the hope that it will be useful,
22 * but WITHOUT ANY WARRANTY; without even the implied warranty of
23 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
24 * GNU General Public License for more details.
25 *
26 * You should have received a copy of the GNU General Public License
27 * along with this program; if not, write to the Free Software
28 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
29 *
30 ****************************************************************************/
32 #include "common.h"
33 #include "netutils.h"
35 unsigned int socket_timeout = DEFAULT_SOCKET_TIMEOUT;
36 int econn_refuse_state = STATE_CRITICAL;
37 int was_refused = FALSE;
38 int address_family = AF_UNSPEC;
40 /* handles socket timeouts */
41 void
42 socket_timeout_alarm_handler (int sig)
43 {
44 if (sig == SIGALRM)
45 printf ("CRITICAL - Socket timeout after %d seconds\n", socket_timeout);
46 else
47 printf ("CRITICAL - Abnormal timeout after %d seconds\n", socket_timeout);
49 exit (STATE_CRITICAL);
50 }
53 /* connects to a host on a specified TCP port, sends a string,
54 and gets a response */
55 int
56 process_tcp_request (const char *server_address, int server_port,
57 const char *send_buffer, char *recv_buffer, int recv_size)
58 {
59 int result;
61 result = process_request (server_address, server_port,
62 IPPROTO_TCP, send_buffer, recv_buffer, recv_size);
64 return result;
65 }
68 /* connects to a host on a specified UDP port, sends a string, and gets a
69 response */
70 int
71 process_udp_request (const char *server_address, int server_port,
72 const char *send_buffer, char *recv_buffer, int recv_size)
73 {
74 int result;
76 result = process_request (server_address, server_port,
77 IPPROTO_UDP, send_buffer, recv_buffer, recv_size);
79 return result;
80 }
84 /* connects to a host on a specified tcp port, sends a string, and gets a
85 response. loops on select-recv until timeout or eof to get all of a
86 multi-packet answer */
87 int
88 process_tcp_request2 (const char *server_address, int server_port,
89 const char *send_buffer, char *recv_buffer, int recv_size)
90 {
92 int result;
93 int send_result;
94 int recv_result;
95 int sd;
96 struct timeval tv;
97 fd_set readfds;
98 int recv_length = 0;
100 result = my_connect (server_address, server_port, &sd, IPPROTO_TCP);
101 if (result != STATE_OK)
102 return STATE_CRITICAL;
104 send_result = send (sd, send_buffer, strlen (send_buffer), 0);
105 if (send_result<0 || (size_t)send_result!=strlen(send_buffer)) {
106 printf ("send() failed\n");
107 result = STATE_WARNING;
108 }
110 while (1) {
111 /* wait up to the number of seconds for socket timeout
112 minus one for data from the host */
113 tv.tv_sec = socket_timeout - 1;
114 tv.tv_usec = 0;
115 FD_ZERO (&readfds);
116 FD_SET (sd, &readfds);
117 select (sd + 1, &readfds, NULL, NULL, &tv);
119 /* make sure some data has arrived */
120 if (!FD_ISSET (sd, &readfds)) { /* it hasn't */
121 if (!recv_length) {
122 strcpy (recv_buffer, "");
123 printf ("No data was recieved from host!\n");
124 result = STATE_WARNING;
125 }
126 else { /* this one failed, but previous ones worked */
127 recv_buffer[recv_length] = 0;
128 }
129 break;
130 }
131 else { /* it has */
132 recv_result =
133 recv (sd, recv_buffer + recv_length,
134 (size_t)recv_size - recv_length - 1, 0);
135 if (recv_result == -1) {
136 /* recv failed, bail out */
137 strcpy (recv_buffer + recv_length, "");
138 result = STATE_WARNING;
139 break;
140 }
141 else if (recv_result == 0) {
142 /* end of file ? */
143 recv_buffer[recv_length] = 0;
144 break;
145 }
146 else { /* we got data! */
147 recv_length += recv_result;
148 if (recv_length >= recv_size - 1) {
149 /* buffer full, we're done */
150 recv_buffer[recv_size - 1] = 0;
151 break;
152 }
153 }
154 }
155 /* end if(!FD_ISSET(sd,&readfds)) */
156 }
157 /* end while(1) */
159 close (sd);
160 return result;
161 }
163 /* connects to a host on a specified port, sends a string, and gets a
164 response */
165 int
166 process_request (const char *server_address, int server_port, int proto,
167 const char *send_buffer, char *recv_buffer, int recv_size)
168 {
169 int result;
170 int send_result;
171 int recv_result;
172 int sd;
173 struct timeval tv;
174 fd_set readfds;
176 result = STATE_OK;
178 result = my_connect (server_address, server_port, &sd, proto);
179 if (result != STATE_OK)
180 return STATE_CRITICAL;
182 send_result = send (sd, send_buffer, strlen (send_buffer), 0);
183 if (send_result<0 || (size_t)send_result!=strlen(send_buffer)) {
184 printf ("send() failed\n");
185 result = STATE_WARNING;
186 }
188 /* wait up to the number of seconds for socket timeout minus one
189 for data from the host */
190 tv.tv_sec = socket_timeout - 1;
191 tv.tv_usec = 0;
192 FD_ZERO (&readfds);
193 FD_SET (sd, &readfds);
194 select (sd + 1, &readfds, NULL, NULL, &tv);
196 /* make sure some data has arrived */
197 if (!FD_ISSET (sd, &readfds)) {
198 strcpy (recv_buffer, "");
199 printf ("No data was recieved from host!\n");
200 result = STATE_WARNING;
201 }
203 else {
204 recv_result = recv (sd, recv_buffer, (size_t)recv_size - 1, 0);
205 if (recv_result == -1) {
206 strcpy (recv_buffer, "");
207 if (proto != IPPROTO_TCP)
208 printf ("recv() failed\n");
209 result = STATE_WARNING;
210 }
211 else
212 recv_buffer[recv_result] = 0;
214 /* die returned string */
215 recv_buffer[recv_size - 1] = 0;
216 }
218 close (sd);
220 return result;
221 }
224 /* opens a connection to a remote host/tcp port */
225 int
226 my_tcp_connect (const char *host_name, int port, int *sd)
227 {
228 int result;
230 result = my_connect (host_name, port, sd, IPPROTO_TCP);
232 return result;
233 }
236 /* opens a connection to a remote host/udp port */
237 int
238 my_udp_connect (const char *host_name, int port, int *sd)
239 {
240 int result;
242 result = my_connect (host_name, port, sd, IPPROTO_UDP);
244 return result;
245 }
248 /* opens a tcp or udp connection to a remote host */
249 int
250 my_connect (const char *host_name, int port, int *sd, int proto)
251 {
252 struct addrinfo hints;
253 struct addrinfo *res;
254 char port_str[6];
255 int result;
257 memset (&hints, 0, sizeof (hints));
258 hints.ai_family = address_family;
259 hints.ai_protocol = proto;
260 hints.ai_socktype = (proto == IPPROTO_UDP) ? SOCK_DGRAM : SOCK_STREAM;
262 snprintf (port_str, sizeof (port_str), "%d", port);
263 result = getaddrinfo (host_name, port_str, &hints, &res);
265 if (result != 0) {
266 printf ("%s\n", gai_strerror (result));
267 return STATE_UNKNOWN;
268 }
269 else {
270 while (res) {
271 /* attempt to create a socket */
272 *sd = socket (res->ai_family, (proto == IPPROTO_UDP) ?
273 SOCK_DGRAM : SOCK_STREAM, res->ai_protocol);
275 if (*sd < 0) {
276 printf ("Socket creation failed\n");
277 freeaddrinfo (res);
278 return STATE_UNKNOWN;
279 }
281 /* attempt to open a connection */
282 result = connect (*sd, res->ai_addr, res->ai_addrlen);
284 if (result == 0) {
285 was_refused = FALSE;
286 break;
287 }
289 if (result < 0) {
290 switch (errno) {
291 case ECONNREFUSED:
292 switch (econn_refuse_state) {
293 case STATE_OK:
294 case STATE_WARNING:
295 was_refused = TRUE;
296 }
297 break;
298 }
299 }
301 close (*sd);
302 res = res->ai_next;
303 }
304 freeaddrinfo (res);
305 }
307 if (result == 0)
308 return STATE_OK;
309 else if (was_refused)
310 return econn_refuse_state;
311 else {
312 printf ("%s\n", strerror(errno));
313 return STATE_CRITICAL;
314 }
315 }
317 int
318 is_host (const char *address)
319 {
320 if (is_addr (address) || is_hostname (address))
321 return (TRUE);
323 return (FALSE);
324 }
326 int
327 is_addr (const char *address)
328 {
329 #ifdef USE_IPV6
330 if (is_inet_addr (address) && address_family != AF_INET6)
331 #else
332 if (is_inet_addr (address))
333 #endif
334 return (TRUE);
336 #ifdef USE_IPV6
337 if (is_inet6_addr (address) && address_family != AF_INET)
338 return (TRUE);
339 #endif
341 return (FALSE);
342 }
344 int
345 resolve_host_or_addr (const char *address, int family)
346 {
347 struct addrinfo hints;
348 struct addrinfo *res;
349 int retval;
351 memset (&hints, 0, sizeof (hints));
352 hints.ai_family = family;
353 retval = getaddrinfo (address, NULL, &hints, &res);
355 if (retval != 0)
356 return FALSE;
357 else {
358 freeaddrinfo (res);
359 return TRUE;
360 }
361 }
363 int
364 is_inet_addr (const char *address)
365 {
366 return resolve_host_or_addr (address, AF_INET);
367 }
369 #ifdef USE_IPV6
370 int
371 is_inet6_addr (const char *address)
372 {
373 return resolve_host_or_addr (address, AF_INET6);
374 }
375 #endif
377 int
378 is_hostname (const char *s1)
379 {
380 #ifdef USE_IPV6
381 return resolve_host_or_addr (s1, address_family);
382 #else
383 return resolve_host_or_addr (s1, AF_INET);
384 #endif
385 }