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/******************************************************************************
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* Modified by Tim Bell <bhat@trinity.unimelb.edu.au> 2002-06-05
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* * Program: dig plugin for NetSaint
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* * Copyright (c) 2000
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* * $Id: check_rbl.c,v 1.2 2003/01/13 12:21:51 kdebisschop Exp $
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*****************************************************************************/
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const char progname = "check_rbl";
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int process_arguments(int, char **);
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int call_getopt(int, char **);
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int validate_arguments(void);
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int check_disk(int usp,int free_disk);
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void print_help(void);
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void print_usage(void);
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char *reverse_ipaddr(char *ipaddr);
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char *query_address=NULL;
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char *query_address_rev=NULL;
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char *dns_server=NULL;
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int main(int argc, char **argv){
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char input_buffer[MAX_INPUT_BUFFER];
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char *command_line=NULL;
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/* Set signal handling and alarm */
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if (signal(SIGALRM,popen_timeout_alarm_handler)==SIG_ERR)
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usage("Cannot catch SIGALRM\n");
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if (process_arguments(argc,argv)!=OK)
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usage("Could not parse arguments\n");
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/* reverse the octets in the IP address */
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query_address_rev = reverse_ipaddr(query_address);
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/* build the command to run */
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command_line=ssprintf(command_line,"%s @%s %s.%s",
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PATH_TO_DIG,dns_server,
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query_address_rev, rbl_name);
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command_line=ssprintf(command_line,"%s %s.%s",
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query_address_rev, rbl_name);
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alarm(timeout_interval);
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printf("%s\n",command_line);
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child_process=spopen(command_line);
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if (child_process==NULL) {
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printf("Could not open pipe: %s\n",command_line);
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child_stderr=fdopen(child_stderr_array[fileno(child_process)],"r");
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if(child_stderr==NULL)
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printf("Could not open stderr for %s\n",command_line);
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output=strscpy(output,"");
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while (fgets(input_buffer,MAX_INPUT_BUFFER-1,child_process)) {
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/* the server is responding, we just got the host name... */
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if (strstr(input_buffer,";; ANSWER SECTION:")) {
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/* get the host address */
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if (!fgets(input_buffer,MAX_INPUT_BUFFER-1,child_process))
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if (strpbrk(input_buffer,"\r\n"))
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input_buffer[strcspn(input_buffer,"\r\n")] = '\0';
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if (strstr(input_buffer,query_address_rev)==input_buffer) {
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output=strscpy(output,input_buffer);
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/* we found it, which means it's listed! */
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result=STATE_CRITICAL;
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strcpy(output,"Server not RBL listed.");
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if (result!=STATE_OK) {
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strcpy(output,"No ANSWER SECTION found");
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while (fgets(input_buffer,MAX_INPUT_BUFFER-1,child_stderr)) {
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/* If we get anything on STDERR, at least set warning */
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result=error_set(result,STATE_WARNING);
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printf("%s",input_buffer);
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if (!strcmp(output,""))
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strcpy(output,1+index(input_buffer,':'));
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(void)fclose(child_stderr);
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if (spclose(child_process)) {
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result=error_set(result,STATE_WARNING);
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if (!strcmp(output,""))
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strcpy(output,"nslookup returned error status");
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(void)time(&end_time);
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if (result==STATE_OK)
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printf("RBL check okay - not listed.\n");
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else if (result==STATE_WARNING)
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printf("RBL WARNING - %s\n",!strcmp(output,"")?" Probably a non-existent host/domain":output);
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else if (result==STATE_CRITICAL)
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printf("RBL CRITICAL - %s is listed on %s\n",query_address, rbl_name);
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printf("DNS problem - %s\n",!strcmp(output,"")?" Probably a non-existent host/domain":output);
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/* reverse the ipaddr */
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char *reverse_ipaddr(char *ipaddr)
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static char revip[MAX_HOST_ADDRESS_LENGTH];
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if (strlen(ipaddr) >= MAX_HOST_ADDRESS_LENGTH ||
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sscanf(ipaddr, "%d.%d.%d.%d", &a, &b, &c, &d) != 4) {
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usage("IP address invalid or too long");
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sprintf(revip, "%d.%d.%d.%d", d, c, b, a);
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/* process command-line arguments */
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int process_arguments(int argc, char **argv)
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while((c+=(call_getopt(argc-c,&argv[c])))<argc){
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if (is_option(argv[c]))
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if (query_address==NULL) {
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if (is_host(argv[c])) {
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query_address=argv[c];
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usage("Invalid host name");
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return validate_arguments();
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int call_getopt(int argc, char **argv)
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int option_index = 0;
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static struct option long_options[] =
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{"hostname", required_argument,0,'H'},
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{"server", required_argument,0,'s'},
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{"rblname", required_argument,0,'r'},
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{"verbose", no_argument, 0,'v'},
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{"version", no_argument, 0,'V'},
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{"help", no_argument, 0,'h'},
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c = getopt_long(argc,argv,"+hVvt:s:H:r:",long_options,&option_index);
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c = getopt(argc,argv,"+?hVvt:s:H:r:");
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if(c==-1||c==EOF||c==1)
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case 'H': /* hostname */
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if (is_host(optarg)) {
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query_address=optarg;
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usage("Invalid host name (-H)\n");
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case 's': /* server */
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if (is_host(optarg)) {
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usage("Invalid host name (-s)\n");
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case 'r': /* rblname */
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case 'v': /* verbose */
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case 't': /* timeout */
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if (is_intnonneg(optarg)) {
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timeout_interval=atoi(optarg);
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usage("Time interval must be a nonnegative integer\n");
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case 'V': /* version */
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print_revision(progname,"$Revision: 1.2 $");
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usage("Invalid argument\n");
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int validate_arguments(void)
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if (query_address == NULL || rbl_name == NULL)
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void print_help(void)
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print_revision(progname,"$Revision: 1.2 $");
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("Copyright (c) 2000 Karl DeBisschop\n\n"
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"This plugin uses dig to test whether the specified host is on any RBL lists.\n\n");
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" -H, --hostname=IPADDRESS\n"
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" Check status of indicated host\n"
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" -s, --server=STRING or IPADDRESS\n"
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" DNS server to use\n"
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" -r, --rblname=STRING\n"
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" RBL domain name to use (e.g. relays.ordb.org)\n"
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" -t, --timeout=INTEGER\n"
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" Seconds before connection attempt times out (default: %d)\n"
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" Print extra information (command-line use only)\n"
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" Print detailed help screen\n"
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" Print version information\n\n",
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DEFAULT_SOCKET_TIMEOUT);
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void print_usage(void)
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("Usage: %s -H hostip -r rblname [-s server] [-t timeout] [-v]\n"
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progname, progname, progname);
added
removed
contrib/check_rbl.c
