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 "config.h"
33 #include "common.h"
34 #include <netinet/in.h>
35 #include <arpa/inet.h>
37 extern int socket_timeout;
38 RETSIGTYPE socket_timeout_alarm_handler (int);
40 int process_tcp_request2 (char *, int, char *, char *, int);
41 int process_tcp_request (char *, int, char *, char *, int);
42 int process_udp_request (char *, int, char *, char *, int);
43 int process_request (char *, int, char *, char *, char *, int);
45 int my_tcp_connect (char *, int, int *);
46 int my_udp_connect (char *, int, int *);
47 int my_connect (char *, int, int *, char *);
49 int my_inet_aton (register const char *, struct in_addr *);
51 /* handles socket timeouts */
52 void
53 socket_timeout_alarm_handler (int sig)
54 {
56 printf ("Socket timeout after %d seconds\n", socket_timeout);
58 exit (STATE_CRITICAL);
59 }
62 /* connects to a host on a specified TCP port, sends a string,
63 and gets a response */
64 int
65 process_tcp_request (char *server_address,
66 int server_port,
67 char *send_buffer, char *recv_buffer, int recv_size)
68 {
69 int result;
70 char proto[4] = "tcp";
72 result = process_request (server_address,
73 server_port,
74 proto, send_buffer, recv_buffer, recv_size);
76 return result;
77 }
80 /* connects to a host on a specified UDP port, sends a string, and gets a
81 response */
82 int
83 process_udp_request (char *server_address,
84 int server_port,
85 char *send_buffer, char *recv_buffer, int recv_size)
86 {
87 int result;
88 char proto[4] = "udp";
90 result = process_request (server_address,
91 server_port,
92 proto, send_buffer, recv_buffer, recv_size);
94 return result;
95 }
99 /* connects to a host on a specified tcp port, sends a string, and gets a
100 response. loops on select-recv until timeout or eof to get all of a
101 multi-packet answer */
102 int
103 process_tcp_request2 (char *server_address,
104 int server_port,
105 char *send_buffer, char *recv_buffer, int recv_size)
106 {
108 int result;
109 int send_result;
110 int recv_result;
111 int sd;
112 struct timeval tv;
113 fd_set readfds;
114 int recv_length = 0;
116 result = my_connect (server_address, server_port, &sd, "tcp");
117 if (result != STATE_OK)
118 return STATE_CRITICAL;
120 send_result = send (sd, send_buffer, strlen (send_buffer), 0);
121 if (send_result != strlen (send_buffer)) {
122 printf ("send() failed\n");
123 result = STATE_WARNING;
124 }
126 while (1) {
127 /* wait up to the number of seconds for socket timeout
128 minus one for data from the host */
129 tv.tv_sec = socket_timeout - 1;
130 tv.tv_usec = 0;
131 FD_ZERO (&readfds);
132 FD_SET (sd, &readfds);
133 select (sd + 1, &readfds, NULL, NULL, &tv);
135 /* make sure some data has arrived */
136 if (!FD_ISSET (sd, &readfds)) { /* it hasn't */
137 if (!recv_length) {
138 strcpy (recv_buffer, "");
139 printf ("No data was recieved from host!\n");
140 result = STATE_WARNING;
141 }
142 else { /* this one failed, but previous ones worked */
143 recv_buffer[recv_length] = 0;
144 }
145 break;
146 }
147 else { /* it has */
148 recv_result =
149 recv (sd, recv_buffer + recv_length, recv_size - recv_length - 1, 0);
150 if (recv_result == -1) { /* recv failed, bail out */
151 strcpy (recv_buffer + recv_length, "");
152 result = STATE_WARNING;
153 break;
154 }
155 else if (recv_result == 0) { /* end of file ? */
156 recv_buffer[recv_length] = 0;
157 break;
158 }
159 else { /* we got data! */
160 recv_length += recv_result;
161 if (recv_length >= recv_size - 1) { /* buffer full, we're done */
162 recv_buffer[recv_size - 1] = 0;
163 break;
164 }
165 }
166 } /* end if(!FD_ISSET(sd,&readfds)) */
167 } /* end while(1) */
169 close (sd);
170 return result;
171 }
173 /* connects to a host on a specified port, sends a string, and gets a
174 response */
175 int
176 process_request (char *server_address,
177 int server_port,
178 char *proto,
179 char *send_buffer, char *recv_buffer, int recv_size)
180 {
181 int result;
182 int send_result;
183 int recv_result;
184 int sd;
185 struct timeval tv;
186 fd_set readfds;
188 result = STATE_OK;
190 result = my_connect (server_address, server_port, &sd, proto);
191 if (result != STATE_OK)
192 return STATE_CRITICAL;
194 send_result = send (sd, send_buffer, strlen (send_buffer), 0);
195 if (send_result != strlen (send_buffer)) {
196 printf ("send() failed\n");
197 result = STATE_WARNING;
198 }
200 /* wait up to the number of seconds for socket timeout minus one
201 for data from the host */
202 tv.tv_sec = socket_timeout - 1;
203 tv.tv_usec = 0;
204 FD_ZERO (&readfds);
205 FD_SET (sd, &readfds);
206 select (sd + 1, &readfds, NULL, NULL, &tv);
208 /* make sure some data has arrived */
209 if (!FD_ISSET (sd, &readfds)) {
210 strcpy (recv_buffer, "");
211 printf ("No data was recieved from host!\n");
212 result = STATE_WARNING;
213 }
215 else {
216 recv_result = recv (sd, recv_buffer, recv_size - 1, 0);
217 if (recv_result == -1) {
218 strcpy (recv_buffer, "");
219 if (!strcmp (proto, "tcp"))
220 printf ("recv() failed\n");
221 result = STATE_WARNING;
222 }
223 else
224 recv_buffer[recv_result] = 0;
226 /* terminate returned string */
227 recv_buffer[recv_size - 1] = 0;
228 }
230 close (sd);
232 return result;
233 }
236 /* opens a connection to a remote host/tcp port */
237 int
238 my_tcp_connect (char *host_name, int port, int *sd)
239 {
240 int result;
241 char proto[4] = "tcp";
243 result = my_connect (host_name, port, sd, proto);
245 return result;
246 }
249 /* opens a connection to a remote host/udp port */
250 int
251 my_udp_connect (char *host_name, int port, int *sd)
252 {
253 int result;
254 char proto[4] = "udp";
256 result = my_connect (host_name, port, sd, proto);
258 return result;
259 }
262 /* opens a tcp or udp connection to a remote host */
263 int
264 my_connect (char *host_name, int port, int *sd, char *proto)
265 {
266 struct sockaddr_in servaddr;
267 struct hostent *hp;
268 struct protoent *ptrp;
269 int result;
271 bzero ((char *) &servaddr, sizeof (servaddr));
272 servaddr.sin_family = AF_INET;
273 servaddr.sin_port = htons (port);
275 /* try to bypass using a DNS lookup if this is just an IP address */
276 if (!my_inet_aton (host_name, &servaddr.sin_addr)) {
278 /* else do a DNS lookup */
279 hp = gethostbyname ((const char *) host_name);
280 if (hp == NULL) {
281 printf ("Invalid host name '%s'\n", host_name);
282 return STATE_UNKNOWN;
283 }
285 memcpy (&servaddr.sin_addr, hp->h_addr, hp->h_length);
286 }
288 /* map transport protocol name to protocol number */
289 if ((ptrp = getprotobyname (proto)) == NULL) {
290 printf ("Cannot map \"%s\" to protocol number\n", proto);
291 return STATE_UNKNOWN;
292 }
294 /* create a socket */
295 *sd =
296 socket (PF_INET, (!strcmp (proto, "udp")) ? SOCK_DGRAM : SOCK_STREAM,
297 ptrp->p_proto);
298 if (*sd < 0) {
299 printf ("Socket creation failed\n");
300 return STATE_UNKNOWN;
301 }
303 /* open a connection */
304 result = connect (*sd, (struct sockaddr *) &servaddr, sizeof (servaddr));
305 if (result < 0) {
306 switch (errno) {
307 case ECONNREFUSED:
308 printf ("Connection refused by host\n");
309 break;
310 case ETIMEDOUT:
311 printf ("Timeout while attempting connection\n");
312 break;
313 case ENETUNREACH:
314 printf ("Network is unreachable\n");
315 break;
316 default:
317 printf ("Connection refused or timed out\n");
318 }
320 return STATE_CRITICAL;
321 }
323 return STATE_OK;
324 }
328 /* This code was taken from Fyodor's nmap utility, which was originally
329 taken from the GLIBC 2.0.6 libraries because Solaris doesn't contain
330 the inet_aton() funtion. */
331 int
332 my_inet_aton (register const char *cp, struct in_addr *addr)
333 {
334 register unsigned int val; /* changed from u_long --david */
335 register int base, n;
336 register char c;
337 u_int parts[4];
338 register u_int *pp = parts;
340 c = *cp;
342 for (;;) {
344 /*
345 * Collect number up to ``.''.
346 * Values are specified as for C:
347 * 0x=hex, 0=octal, isdigit=decimal.
348 */
349 if (!isdigit ((int) c))
350 return (0);
351 val = 0;
352 base = 10;
354 if (c == '0') {
355 c = *++cp;
356 if (c == 'x' || c == 'X')
357 base = 16, c = *++cp;
358 else
359 base = 8;
360 }
362 for (;;) {
363 if (isascii ((int) c) && isdigit ((int) c)) {
364 val = (val * base) + (c - '0');
365 c = *++cp;
366 }
367 else if (base == 16 && isascii ((int) c) && isxdigit ((int) c)) {
368 val = (val << 4) | (c + 10 - (islower ((int) c) ? 'a' : 'A'));
369 c = *++cp;
370 }
371 else
372 break;
373 }
375 if (c == '.') {
377 /*
378 * Internet format:
379 * a.b.c.d
380 * a.b.c (with c treated as 16 bits)
381 * a.b (with b treated as 24 bits)
382 */
383 if (pp >= parts + 3)
384 return (0);
385 *pp++ = val;
386 c = *++cp;
387 }
388 else
389 break;
390 }
392 /* Check for trailing characters */
393 if (c != '\0' && (!isascii ((int) c) || !isspace ((int) c)))
394 return (0);
396 /* Concoct the address according to the number of parts specified */
397 n = pp - parts + 1;
398 switch (n) {
400 case 0:
401 return (0); /* initial nondigit */
403 case 1: /* a -- 32 bits */
404 break;
406 case 2: /* a.b -- 8.24 bits */
407 if (val > 0xffffff)
408 return (0);
409 val |= parts[0] << 24;
410 break;
412 case 3: /* a.b.c -- 8.8.16 bits */
413 if (val > 0xffff)
414 return (0);
415 val |= (parts[0] << 24) | (parts[1] << 16);
416 break;
418 case 4: /* a.b.c.d -- 8.8.8.8 bits */
419 if (val > 0xff)
420 return (0);
421 val |= (parts[0] << 24) | (parts[1] << 16) | (parts[2] << 8);
422 break;
423 }
425 if (addr)
426 addr->s_addr = htonl (val);
428 return (1);
429 }