Code

ipv4/ipv6 switch added
[nagiosplug.git] / plugins / netutils.c
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 <sys/socket.h>
35 #include <netinet/in.h>
36 #include <arpa/inet.h>
37 #include <netdb.h>
39 extern int socket_timeout;
40 RETSIGTYPE socket_timeout_alarm_handler (int);
42 int process_tcp_request2 (char *, int, char *, char *, int);
43 int process_tcp_request (char *, int, char *, char *, int);
44 int process_udp_request (char *, int, char *, char *, int);
45 int process_request (char *, int, char *, char *, char *, int);
47 int my_tcp_connect (char *, int, int *);
48 int my_udp_connect (char *, int, int *);
49 int my_connect (char *, int, int *, char *);
51 int my_inet_aton (register const char *, struct in_addr *);
53 /* handles socket timeouts */
54 void
55 socket_timeout_alarm_handler (int sig)
56 {
58         printf ("Socket timeout after %d seconds\n", socket_timeout);
60         exit (STATE_CRITICAL);
61 }
64 /* connects to a host on a specified TCP port, sends a string,
65    and gets a response */
66 int
67 process_tcp_request (char *server_address,
68                                                                                  int server_port,
69                                                                                  char *send_buffer, char *recv_buffer, int recv_size)
70 {
71         int result;
72         char proto[4] = "tcp";
74         result = process_request (server_address,
75                                                                                                                 server_port,
76                                                                                                                 proto, send_buffer, recv_buffer, recv_size);
78         return result;
79 }
82 /* connects to a host on a specified UDP port, sends a string, and gets a
83     response */
84 int
85 process_udp_request (char *server_address,
86                                                                                  int server_port,
87                                                                                  char *send_buffer, char *recv_buffer, int recv_size)
88 {
89         int result;
90         char proto[4] = "udp";
92         result = process_request (server_address,
93                                                                                                                 server_port,
94                                                                                                                 proto, send_buffer, recv_buffer, recv_size);
96         return result;
97 }
101 /* connects to a host on a specified tcp port, sends a string, and gets a 
102          response. loops on select-recv until timeout or eof to get all of a 
103          multi-packet answer */
104 int
105 process_tcp_request2 (char *server_address,
106                                                                                         int server_port,
107                                                                                         char *send_buffer, char *recv_buffer, int recv_size)
110         int result;
111         int send_result;
112         int recv_result;
113         int sd;
114         struct timeval tv;
115         fd_set readfds;
116         int recv_length = 0;
118         result = my_connect (server_address, server_port, &sd, "tcp");
119         if (result != STATE_OK)
120                 return STATE_CRITICAL;
122         send_result = send (sd, send_buffer, strlen (send_buffer), 0);
123         if (send_result != strlen (send_buffer)) {
124                 printf ("send() failed\n");
125                 result = STATE_WARNING;
126         }
128         while (1) {
129                 /* wait up to the number of seconds for socket timeout
130                    minus one for data from the host */
131                 tv.tv_sec = socket_timeout - 1;
132                 tv.tv_usec = 0;
133                 FD_ZERO (&readfds);
134                 FD_SET (sd, &readfds);
135                 select (sd + 1, &readfds, NULL, NULL, &tv);
137                 /* make sure some data has arrived */
138                 if (!FD_ISSET (sd, &readfds)) { /* it hasn't */
139                         if (!recv_length) {
140                                 strcpy (recv_buffer, "");
141                                 printf ("No data was recieved from host!\n");
142                                 result = STATE_WARNING;
143                         }
144                         else {                                                                          /* this one failed, but previous ones worked */
145                                 recv_buffer[recv_length] = 0;
146                         }
147                         break;
148                 }
149                 else {                                                                                  /* it has */
150                         recv_result =
151                                 recv (sd, recv_buffer + recv_length, recv_size - recv_length - 1, 0);
152                         if (recv_result == -1) {        /* recv failed, bail out */
153                                 strcpy (recv_buffer + recv_length, "");
154                                 result = STATE_WARNING;
155                                 break;
156                         }
157                         else if (recv_result == 0) {    /* end of file ? */
158                                 recv_buffer[recv_length] = 0;
159                                 break;
160                         }
161                         else {                                                                          /* we got data! */
162                                 recv_length += recv_result;
163                                 if (recv_length >= recv_size - 1) {     /* buffer full, we're done */
164                                         recv_buffer[recv_size - 1] = 0;
165                                         break;
166                                 }
167                         }
168                 }                                                                                                               /* end if(!FD_ISSET(sd,&readfds)) */
169         }                                                                                                                       /* end while(1) */
171         close (sd);
172         return result;
175 /* connects to a host on a specified port, sends a string, and gets a 
176    response */
177 int
178 process_request (char *server_address,
179                                                                  int server_port,
180                                                                  char *proto,
181                                                                  char *send_buffer, char *recv_buffer, int recv_size)
183         int result;
184         int send_result;
185         int recv_result;
186         int sd;
187         struct timeval tv;
188         fd_set readfds;
190         result = STATE_OK;
192         result = my_connect (server_address, server_port, &sd, proto);
193         if (result != STATE_OK)
194                 return STATE_CRITICAL;
196         send_result = send (sd, send_buffer, strlen (send_buffer), 0);
197         if (send_result != strlen (send_buffer)) {
198                 printf ("send() failed\n");
199                 result = STATE_WARNING;
200         }
202         /* wait up to the number of seconds for socket timeout minus one 
203            for data from the host */
204         tv.tv_sec = socket_timeout - 1;
205         tv.tv_usec = 0;
206         FD_ZERO (&readfds);
207         FD_SET (sd, &readfds);
208         select (sd + 1, &readfds, NULL, NULL, &tv);
210         /* make sure some data has arrived */
211         if (!FD_ISSET (sd, &readfds)) {
212                 strcpy (recv_buffer, "");
213                 printf ("No data was recieved from host!\n");
214                 result = STATE_WARNING;
215         }
217         else {
218                 recv_result = recv (sd, recv_buffer, recv_size - 1, 0);
219                 if (recv_result == -1) {
220                         strcpy (recv_buffer, "");
221                         if (!strcmp (proto, "tcp"))
222                                 printf ("recv() failed\n");
223                         result = STATE_WARNING;
224                 }
225                 else
226                         recv_buffer[recv_result] = 0;
228                 /* terminate returned string */
229                 recv_buffer[recv_size - 1] = 0;
230         }
232         close (sd);
234         return result;
238 /* opens a connection to a remote host/tcp port */
239 int
240 my_tcp_connect (char *host_name, int port, int *sd)
242         int result;
243         char proto[4] = "tcp";
245         result = my_connect (host_name, port, sd, proto);
247         return result;
251 /* opens a connection to a remote host/udp port */
252 int
253 my_udp_connect (char *host_name, int port, int *sd)
255         int result;
256         char proto[4] = "udp";
258         result = my_connect (host_name, port, sd, proto);
260         return result;
264 /* opens a tcp or udp connection to a remote host */
265 int
266 my_connect (char *host_name, int port, int *sd, char *proto)
268         struct sockaddr_in servaddr;
269         struct hostent *hp;
270         struct protoent *ptrp;
271         int result;
273         bzero ((char *) &servaddr, sizeof (servaddr));
274         servaddr.sin_family = AF_INET;
275         servaddr.sin_port = htons (port);
277         /* try to bypass using a DNS lookup if this is just an IP address */
278         if (!my_inet_aton (host_name, &servaddr.sin_addr)) {
280                 /* else do a DNS lookup */
281                 hp = gethostbyname ((const char *) host_name);
282                 if (hp == NULL) {
283                         printf ("Invalid host name '%s'\n", host_name);
284                         return STATE_UNKNOWN;
285                 }
287                 memcpy (&servaddr.sin_addr, hp->h_addr, hp->h_length);
288         }
290         /* map transport protocol name to protocol number */
291         if ((ptrp = getprotobyname (proto)) == NULL) {
292                 printf ("Cannot map \"%s\" to protocol number\n", proto);
293                 return STATE_UNKNOWN;
294         }
296         /* create a socket */
297         *sd =
298                 socket (PF_INET, (!strcmp (proto, "udp")) ? SOCK_DGRAM : SOCK_STREAM,
299                                                 ptrp->p_proto);
300         if (*sd < 0) {
301                 printf ("Socket creation failed\n");
302                 return STATE_UNKNOWN;
303         }
305         /* open a connection */
306         result = connect (*sd, (struct sockaddr *) &servaddr, sizeof (servaddr));
307         if (result < 0) {
308                 switch (errno) {
309                 case ECONNREFUSED:
310                         printf ("Connection refused by host\n");
311                         break;
312                 case ETIMEDOUT:
313                         printf ("Timeout while attempting connection\n");
314                         break;
315                 case ENETUNREACH:
316                         printf ("Network is unreachable\n");
317                         break;
318                 default:
319                         printf ("Connection refused or timed out\n");
320                 }
322                 return STATE_CRITICAL;
323         }
325         return STATE_OK;
330 /* This code was taken from Fyodor's nmap utility, which was originally
331          taken from the GLIBC 2.0.6 libraries because Solaris doesn't contain
332          the inet_aton() funtion. */
333 int
334 my_inet_aton (register const char *cp, struct in_addr *addr)
336         register unsigned int val;              /* changed from u_long --david */
337         register int base, n;
338         register char c;
339         u_int parts[4];
340         register u_int *pp = parts;
342         c = *cp;
344         for (;;) {
346                 /*
347                  * Collect number up to ``.''.
348                  * Values are specified as for C:
349                  * 0x=hex, 0=octal, isdigit=decimal.
350                  */
351                 if (!isdigit ((int) c))
352                         return (0);
353                 val = 0;
354                 base = 10;
356                 if (c == '0') {
357                         c = *++cp;
358                         if (c == 'x' || c == 'X')
359                                 base = 16, c = *++cp;
360                         else
361                                 base = 8;
362                 }
364                 for (;;) {
365                         if (isascii ((int) c) && isdigit ((int) c)) {
366                                 val = (val * base) + (c - '0');
367                                 c = *++cp;
368                         }
369                         else if (base == 16 && isascii ((int) c) && isxdigit ((int) c)) {
370                                 val = (val << 4) | (c + 10 - (islower ((int) c) ? 'a' : 'A'));
371                                 c = *++cp;
372                         }
373                         else
374                                 break;
375                 }
377                 if (c == '.') {
379                         /*
380                          * Internet format:
381                          *  a.b.c.d
382                          *  a.b.c (with c treated as 16 bits)
383                          *  a.b (with b treated as 24 bits)
384                          */
385                         if (pp >= parts + 3)
386                                 return (0);
387                         *pp++ = val;
388                         c = *++cp;
389                 }
390                 else
391                         break;
392         }
394         /* Check for trailing characters */
395         if (c != '\0' && (!isascii ((int) c) || !isspace ((int) c)))
396                 return (0);
398         /* Concoct the address according to the number of parts specified */
399         n = pp - parts + 1;
400         switch (n) {
402         case 0:
403                 return (0);                                                                     /* initial nondigit */
405         case 1:                                                                                 /* a -- 32 bits */
406                 break;
408         case 2:                                                                                 /* a.b -- 8.24 bits */
409                 if (val > 0xffffff)
410                         return (0);
411                 val |= parts[0] << 24;
412                 break;
414         case 3:                                                                                 /* a.b.c -- 8.8.16 bits */
415                 if (val > 0xffff)
416                         return (0);
417                 val |= (parts[0] << 24) | (parts[1] << 16);
418                 break;
420         case 4:                                                                                 /* a.b.c.d -- 8.8.8.8 bits */
421                 if (val > 0xff)
422                         return (0);
423                 val |= (parts[0] << 24) | (parts[1] << 16) | (parts[2] << 8);
424                 break;
425         }
427         if (addr)
428                 addr->s_addr = htonl (val);
430         return (1);