1 /******************************************************************************
2 *
3 * check_rbl.c
4 *
5 * Modified by Tim Bell <bhat@trinity.unimelb.edu.au> 2002-06-05
6 * based on:
7 *
8 * * check_dig.c
9 * *
10 * * Program: dig plugin for NetSaint
11 * * License: GPL
12 * * Copyright (c) 2000
13 * *
14 * * $Id$
15 *
16 *****************************************************************************/
18 #include "config.h"
19 #include "common.h"
20 #include "utils.h"
21 #include "popen.h"
22 #include "string.h"
24 #define PROGNAME "check_rbl"
26 int process_arguments(int, char **);
27 int call_getopt(int, char **);
28 int validate_arguments(void);
29 int check_disk(int usp,int free_disk);
30 void print_help(void);
31 void print_usage(void);
32 char *reverse_ipaddr(char *ipaddr);
34 char *query_address=NULL;
35 char *query_address_rev=NULL;
36 char *dns_server=NULL;
37 char *rbl_name=NULL;
38 int verbose=FALSE;
40 int main(int argc, char **argv){
41 char input_buffer[MAX_INPUT_BUFFER];
42 char *command_line=NULL;
43 char *output=NULL;
44 int result=STATE_OK;
46 /* Set signal handling and alarm */
47 if (signal(SIGALRM,popen_timeout_alarm_handler)==SIG_ERR)
48 usage("Cannot catch SIGALRM\n");
50 if (process_arguments(argc,argv)!=OK)
51 usage("Could not parse arguments\n");
53 /* reverse the octets in the IP address */
54 query_address_rev = reverse_ipaddr(query_address);
56 /* build the command to run */
57 if (dns_server) {
58 command_line=ssprintf(command_line,"%s @%s %s.%s",
59 PATH_TO_DIG,dns_server,
60 query_address_rev, rbl_name);
61 } else {
62 command_line=ssprintf(command_line,"%s %s.%s",
63 PATH_TO_DIG,
64 query_address_rev, rbl_name);
65 }
66 alarm(timeout_interval);
67 time(&start_time);
69 if (verbose)
70 printf("%s\n",command_line);
71 /* run the command */
72 child_process=spopen(command_line);
73 if (child_process==NULL) {
74 printf("Could not open pipe: %s\n",command_line);
75 return STATE_UNKNOWN;
76 }
78 child_stderr=fdopen(child_stderr_array[fileno(child_process)],"r");
79 if(child_stderr==NULL)
80 printf("Could not open stderr for %s\n",command_line);
82 output=strscpy(output,"");
84 while (fgets(input_buffer,MAX_INPUT_BUFFER-1,child_process)) {
86 /* the server is responding, we just got the host name... */
87 if (strstr(input_buffer,";; ANSWER SECTION:")) {
89 /* get the host address */
90 if (!fgets(input_buffer,MAX_INPUT_BUFFER-1,child_process))
91 break;
93 if (strpbrk(input_buffer,"\r\n"))
94 input_buffer[strcspn(input_buffer,"\r\n")] = '\0';
96 if (strstr(input_buffer,query_address_rev)==input_buffer) {
97 output=strscpy(output,input_buffer);
98 /* we found it, which means it's listed! */
99 result=STATE_CRITICAL;
100 } else {
101 strcpy(output,"Server not RBL listed.");
102 result=STATE_OK;
103 }
105 continue;
106 }
108 }
110 /*
111 if (result!=STATE_OK) {
112 strcpy(output,"No ANSWER SECTION found");
113 }
114 */
116 while (fgets(input_buffer,MAX_INPUT_BUFFER-1,child_stderr)) {
117 /* If we get anything on STDERR, at least set warning */
118 result=error_set(result,STATE_WARNING);
119 printf("%s",input_buffer);
120 if (!strcmp(output,""))
121 strcpy(output,1+index(input_buffer,':'));
122 }
124 (void)fclose(child_stderr);
126 /* close the pipe */
127 if (spclose(child_process)) {
128 result=error_set(result,STATE_WARNING);
129 if (!strcmp(output,""))
130 strcpy(output,"nslookup returned error status");
131 }
133 (void)time(&end_time);
135 if (result==STATE_OK)
136 printf("RBL check okay - not listed.\n");
137 else if (result==STATE_WARNING)
138 printf("RBL WARNING - %s\n",!strcmp(output,"")?" Probably a non-existent host/domain":output);
139 else if (result==STATE_CRITICAL)
140 printf("RBL CRITICAL - %s is listed on %s\n",query_address, rbl_name);
141 else
142 printf("DNS problem - %s\n",!strcmp(output,"")?" Probably a non-existent host/domain":output);
144 return result;
145 }
147 /* reverse the ipaddr */
148 char *reverse_ipaddr(char *ipaddr)
149 {
150 static char revip[MAX_HOST_ADDRESS_LENGTH];
151 int a, b, c, d;
153 if (strlen(ipaddr) >= MAX_HOST_ADDRESS_LENGTH ||
154 sscanf(ipaddr, "%d.%d.%d.%d", &a, &b, &c, &d) != 4) {
155 usage("IP address invalid or too long");
156 }
157 sprintf(revip, "%d.%d.%d.%d", d, c, b, a);
159 return revip;
160 }
163 /* process command-line arguments */
164 int process_arguments(int argc, char **argv)
165 {
166 int c;
168 if(argc<2)
169 return ERROR;
172 c=0;
173 while((c+=(call_getopt(argc-c,&argv[c])))<argc){
175 if (is_option(argv[c]))
176 continue;
178 if (query_address==NULL) {
179 if (is_host(argv[c])) {
180 query_address=argv[c];
181 } else {
182 usage("Invalid host name");
183 }
184 }
185 }
187 return validate_arguments();
188 }
195 int call_getopt(int argc, char **argv)
196 {
197 int c,i=0;
199 #ifdef HAVE_GETOPT_H
200 int option_index = 0;
201 static struct option long_options[] =
202 {
203 {"hostname", required_argument,0,'H'},
204 {"server", required_argument,0,'s'},
205 {"rblname", required_argument,0,'r'},
206 {"verbose", no_argument, 0,'v'},
207 {"version", no_argument, 0,'V'},
208 {"help", no_argument, 0,'h'},
209 {0,0,0,0}
210 };
211 #endif
213 while (1){
214 #ifdef HAVE_GETOPT_H
215 c = getopt_long(argc,argv,"+hVvt:s:H:r:",long_options,&option_index);
216 #else
217 c = getopt(argc,argv,"+?hVvt:s:H:r:");
218 #endif
220 i++;
222 if(c==-1||c==EOF||c==1)
223 break;
225 switch (c)
226 {
227 case 't':
228 case 'l':
229 case 'H':
230 i++;
231 }
233 switch (c)
234 {
235 case 'H': /* hostname */
236 if (is_host(optarg)) {
237 query_address=optarg;
238 } else {
239 usage("Invalid host name (-H)\n");
240 }
241 break;
242 case 's': /* server */
243 if (is_host(optarg)) {
244 dns_server=optarg;
245 } else {
246 usage("Invalid host name (-s)\n");
247 }
248 break;
249 case 'r': /* rblname */
250 rbl_name=optarg;
251 break;
252 case 'v': /* verbose */
253 verbose=TRUE;
254 break;
255 case 't': /* timeout */
256 if (is_intnonneg(optarg)) {
257 timeout_interval=atoi(optarg);
258 } else {
259 usage("Time interval must be a nonnegative integer\n");
260 }
261 break;
262 case 'V': /* version */
263 print_revision(PROGNAME,"$Revision$");
264 exit(STATE_OK);
265 case 'h': /* help */
266 print_help();
267 exit(STATE_OK);
268 case '?': /* help */
269 usage("Invalid argument\n");
270 }
271 }
272 return i;
273 }
279 int validate_arguments(void)
280 {
281 if (query_address == NULL || rbl_name == NULL)
282 return ERROR;
283 else
284 return OK;
285 }
291 void print_help(void)
292 {
293 print_revision(PROGNAME,"$Revision$");
294 printf
295 ("Copyright (c) 2000 Karl DeBisschop\n\n"
296 "This plugin uses dig to test whether the specified host is on any RBL lists.\n\n");
297 print_usage();
298 printf
299 ("\nOptions:\n"
300 " -H, --hostname=IPADDRESS\n"
301 " Check status of indicated host\n"
302 " -s, --server=STRING or IPADDRESS\n"
303 " DNS server to use\n"
304 " -r, --rblname=STRING\n"
305 " RBL domain name to use (e.g. relays.ordb.org)\n"
306 " -t, --timeout=INTEGER\n"
307 " Seconds before connection attempt times out (default: %d)\n"
308 " -v, --verbose\n"
309 " Print extra information (command-line use only)\n"
310 " -h, --help\n"
311 " Print detailed help screen\n"
312 " -V, --version\n"
313 " Print version information\n\n",
314 DEFAULT_SOCKET_TIMEOUT);
315 support();
316 }
322 void print_usage(void)
323 {
324 printf
325 ("Usage: %s -H hostip -r rblname [-s server] [-t timeout] [-v]\n"
326 " %s --help\n"
327 " %s --version\n",
328 PROGNAME,PROGNAME,PROGNAME);
329 }