1 /*****************************************************************************
2 *
3 * Nagios plugins network utilities
4 *
5 * License: GPL
6 * Copyright (c) 1999 Ethan Galstad (nagios@nagios.org)
7 * Copyright (c) 2003-2008 Nagios Plugins Development Team
8 *
9 * Last Modified: $Date$
10 *
11 * Description:
12 *
13 * This file contains commons functions used in many of the plugins.
14 *
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 3 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, see <http://www.gnu.org/licenses/>.
28 *
29 * $Id$
30 *
31 *****************************************************************************/
33 #define LOCAL_TIMEOUT_ALARM_HANDLER
35 #include "common.h"
36 #include "netutils.h"
38 unsigned int socket_timeout = DEFAULT_SOCKET_TIMEOUT;
39 int econn_refuse_state = STATE_CRITICAL;
40 int was_refused = FALSE;
41 #if USE_IPV6
42 int address_family = AF_UNSPEC;
43 #else
44 int address_family = AF_INET;
45 #endif
47 /* handles socket timeouts */
48 void
49 socket_timeout_alarm_handler (int sig)
50 {
51 if (sig == SIGALRM)
52 printf (_("CRITICAL - Socket timeout after %d seconds\n"), socket_timeout);
53 else
54 printf (_("CRITICAL - Abnormal timeout after %d seconds\n"), socket_timeout);
56 exit (STATE_CRITICAL);
57 }
60 /* connects to a host on a specified tcp port, sends a string, and gets a
61 response. loops on select-recv until timeout or eof to get all of a
62 multi-packet answer */
63 int
64 process_tcp_request2 (const char *server_address, int server_port,
65 const char *send_buffer, char *recv_buffer, int recv_size)
66 {
68 int result;
69 int send_result;
70 int recv_result;
71 int sd;
72 struct timeval tv;
73 fd_set readfds;
74 int recv_length = 0;
76 result = np_net_connect (server_address, server_port, &sd, IPPROTO_TCP);
77 if (result != STATE_OK)
78 return STATE_CRITICAL;
80 send_result = send (sd, send_buffer, strlen (send_buffer), 0);
81 if (send_result<0 || (size_t)send_result!=strlen(send_buffer)) {
82 printf ("%s\n", _("Send failed"));
83 result = STATE_WARNING;
84 }
86 while (1) {
87 /* wait up to the number of seconds for socket timeout
88 minus one for data from the host */
89 tv.tv_sec = socket_timeout - 1;
90 tv.tv_usec = 0;
91 FD_ZERO (&readfds);
92 FD_SET (sd, &readfds);
93 select (sd + 1, &readfds, NULL, NULL, &tv);
95 /* make sure some data has arrived */
96 if (!FD_ISSET (sd, &readfds)) { /* it hasn't */
97 if (!recv_length) {
98 strcpy (recv_buffer, "");
99 printf ("%s\n", _("No data was received from host!"));
100 result = STATE_WARNING;
101 }
102 else { /* this one failed, but previous ones worked */
103 recv_buffer[recv_length] = 0;
104 }
105 break;
106 }
107 else { /* it has */
108 recv_result =
109 recv (sd, recv_buffer + recv_length,
110 (size_t)recv_size - recv_length - 1, 0);
111 if (recv_result == -1) {
112 /* recv failed, bail out */
113 strcpy (recv_buffer + recv_length, "");
114 result = STATE_WARNING;
115 break;
116 }
117 else if (recv_result == 0) {
118 /* end of file ? */
119 recv_buffer[recv_length] = 0;
120 break;
121 }
122 else { /* we got data! */
123 recv_length += recv_result;
124 if (recv_length >= recv_size - 1) {
125 /* buffer full, we're done */
126 recv_buffer[recv_size - 1] = 0;
127 break;
128 }
129 }
130 }
131 /* end if(!FD_ISSET(sd,&readfds)) */
132 }
133 /* end while(1) */
135 close (sd);
136 return result;
137 }
140 /* connects to a host on a specified port, sends a string, and gets a
141 response */
142 int
143 process_request (const char *server_address, int server_port, int proto,
144 const char *send_buffer, char *recv_buffer, int recv_size)
145 {
146 int result;
147 int sd;
149 result = STATE_OK;
151 result = np_net_connect (server_address, server_port, &sd, proto);
152 if (result != STATE_OK)
153 return STATE_CRITICAL;
155 result = send_request (sd, proto, send_buffer, recv_buffer, recv_size);
157 close (sd);
159 return result;
160 }
163 /* opens a tcp or udp connection to a remote host or local socket */
164 int
165 np_net_connect (const char *host_name, int port, int *sd, int proto)
166 {
167 struct addrinfo hints;
168 struct addrinfo *r, *res;
169 struct sockaddr_un su;
170 char port_str[6], host[MAX_HOST_ADDRESS_LENGTH];
171 size_t len;
172 int socktype, result;
174 socktype = (proto == IPPROTO_UDP) ? SOCK_DGRAM : SOCK_STREAM;
176 /* as long as it doesn't start with a '/', it's assumed a host or ip */
177 if(host_name[0] != '/'){
178 memset (&hints, 0, sizeof (hints));
179 hints.ai_family = address_family;
180 hints.ai_protocol = proto;
181 hints.ai_socktype = socktype;
183 len = strlen (host_name);
184 /* check for an [IPv6] address (and strip the brackets) */
185 if (len >= 2 && host_name[0] == '[' && host_name[len - 1] == ']') {
186 host_name++;
187 len -= 2;
188 }
189 if (len >= sizeof(host))
190 return STATE_UNKNOWN;
191 memcpy (host, host_name, len);
192 host[len] = '\0';
193 snprintf (port_str, sizeof (port_str), "%d", port);
194 result = getaddrinfo (host, port_str, &hints, &res);
196 if (result != 0) {
197 printf ("%s\n", gai_strerror (result));
198 return STATE_UNKNOWN;
199 }
201 r = res;
202 while (r) {
203 /* attempt to create a socket */
204 *sd = socket (r->ai_family, socktype, r->ai_protocol);
206 if (*sd < 0) {
207 printf ("%s\n", _("Socket creation failed"));
208 freeaddrinfo (r);
209 return STATE_UNKNOWN;
210 }
212 /* attempt to open a connection */
213 result = connect (*sd, r->ai_addr, r->ai_addrlen);
215 if (result == 0) {
216 was_refused = FALSE;
217 break;
218 }
220 if (result < 0) {
221 switch (errno) {
222 case ECONNREFUSED:
223 was_refused = TRUE;
224 break;
225 }
226 }
228 close (*sd);
229 r = r->ai_next;
230 }
231 freeaddrinfo (res);
232 }
233 /* else the hostname is interpreted as a path to a unix socket */
234 else {
235 if(strlen(host_name) >= UNIX_PATH_MAX){
236 die(STATE_UNKNOWN, _("Supplied path too long unix domain socket"));
237 }
238 memset(&su, 0, sizeof(su));
239 su.sun_family = AF_UNIX;
240 strncpy(su.sun_path, host_name, UNIX_PATH_MAX);
241 *sd = socket(PF_UNIX, SOCK_STREAM, 0);
242 if(*sd < 0){
243 die(STATE_UNKNOWN, _("Socket creation failed"));
244 }
245 result = connect(*sd, (struct sockaddr *)&su, sizeof(su));
246 if (result < 0 && errno == ECONNREFUSED)
247 was_refused = TRUE;
248 }
250 if (result == 0)
251 return STATE_OK;
252 else if (was_refused) {
253 switch (econn_refuse_state) { /* a user-defined expected outcome */
254 case STATE_OK:
255 case STATE_WARNING: /* user wants WARN or OK on refusal */
256 return econn_refuse_state;
257 break;
258 case STATE_CRITICAL: /* user did not set econn_refuse_state */
259 printf ("%s\n", strerror(errno));
260 return econn_refuse_state;
261 break;
262 default: /* it's a logic error if we do not end up in STATE_(OK|WARNING|CRITICAL) */
263 return STATE_UNKNOWN;
264 break;
265 }
266 }
267 else {
268 printf ("%s\n", strerror(errno));
269 return STATE_CRITICAL;
270 }
271 }
273 int
274 send_request (int sd, int proto, const char *send_buffer, char *recv_buffer, int recv_size)
275 {
276 int result = STATE_OK;
277 int send_result;
278 int recv_result;
279 struct timeval tv;
280 fd_set readfds;
282 send_result = send (sd, send_buffer, strlen (send_buffer), 0);
283 if (send_result<0 || (size_t)send_result!=strlen(send_buffer)) {
284 printf ("%s\n", _("Send failed"));
285 result = STATE_WARNING;
286 }
288 /* wait up to the number of seconds for socket timeout minus one
289 for data from the host */
290 tv.tv_sec = socket_timeout - 1;
291 tv.tv_usec = 0;
292 FD_ZERO (&readfds);
293 FD_SET (sd, &readfds);
294 select (sd + 1, &readfds, NULL, NULL, &tv);
296 /* make sure some data has arrived */
297 if (!FD_ISSET (sd, &readfds)) {
298 strcpy (recv_buffer, "");
299 printf ("%s\n", _("No data was received from host!"));
300 result = STATE_WARNING;
301 }
303 else {
304 recv_result = recv (sd, recv_buffer, (size_t)recv_size - 1, 0);
305 if (recv_result == -1) {
306 strcpy (recv_buffer, "");
307 if (proto != IPPROTO_TCP)
308 printf ("%s\n", _("Receive failed"));
309 result = STATE_WARNING;
310 }
311 else
312 recv_buffer[recv_result] = 0;
314 /* die returned string */
315 recv_buffer[recv_size - 1] = 0;
316 }
317 return result;
318 }
321 int
322 is_host (const char *address)
323 {
324 if (is_addr (address) || is_hostname (address))
325 return (TRUE);
327 return (FALSE);
328 }
330 void
331 host_or_die(const char *str)
332 {
333 if(!str || (!is_addr(str) && !is_hostname(str)))
334 usage_va(_("Invalid hostname/address - %s"), str);
335 }
337 int
338 is_addr (const char *address)
339 {
340 #ifdef USE_IPV6
341 if (address_family == AF_INET && is_inet_addr (address))
342 return TRUE;
343 else if (address_family == AF_INET6 && is_inet6_addr (address))
344 return TRUE;
345 #else
346 if (is_inet_addr (address))
347 return (TRUE);
348 #endif
350 return (FALSE);
351 }
353 int
354 resolve_host_or_addr (const char *address, int family)
355 {
356 struct addrinfo hints;
357 struct addrinfo *res;
358 int retval;
360 memset (&hints, 0, sizeof (hints));
361 hints.ai_family = family;
362 retval = getaddrinfo (address, NULL, &hints, &res);
364 if (retval != 0)
365 return FALSE;
366 else {
367 freeaddrinfo (res);
368 return TRUE;
369 }
370 }