233 lines
6.4 KiB
C
233 lines
6.4 KiB
C
/* NeoStats - IRC Statistical Services
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** Copyright (c) 1999-2003 Adam Rutter, Justin Hammond
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** http://www.neostats.net/
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**
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**
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**
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** This program is free software; you can redistribute it and/or modify
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** it under the terms of the GNU General Public License as published by
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** the Free Software Foundation; either version 2 of the License, or
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** (at your option) any later version.
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**
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** This program is distributed in the hope that it will be useful,
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** but WITHOUT ANY WARRANTY; without even the implied warranty of
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** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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** GNU General Public License for more details.
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**
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** You should have received a copy of the GNU General Public License
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** along with this program; if not, write to the Free Software
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** Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
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** USA
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**
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** NeoStats CVS Identification
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** $Id: dns.c,v 1.14 2003/06/13 13:11:48 fishwaldo Exp $
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*/
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/* this file does the dns checking for adns. it provides a callback mechinism for dns lookups
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** so that DNS lookups will not block. It uses the adns libary (installed in the adns directory
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*/
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <netinet/in.h>
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#include <arpa/inet.h>
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#include "stats.h"
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#include "log.h"
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#include <adns.h>
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/** @brief DNS lookup Struct
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* structure containing all pending DNS lookups and the callback functions
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*/
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struct dnslookup_struct {
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adns_query q; /**< the ADNS query */
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adns_answer *a; /**< the ADNS result if we have completed */
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char data[255]; /**< the User data based to the callback */
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void (*callback) (char *data, adns_answer * a);
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/**< a function pointer to call when we have a result */
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char mod_name[MAXHOST];
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};
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/** @brief DNS structures
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*/
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typedef struct dnslookup_struct DnsLookup;
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/** @brief List of DNS queryies
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* Contains DnsLookup entries
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*/
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list_t *dnslist;
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/** @brief starts a DNS lookup
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*
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* starts a DNS lookup for str of type type can callback the function
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* when complete. Data is a identifier that is not modified to identify this lookup to the callback function
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*
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* @param str the record to lookup
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* @param type The type of record to lookup. See adns.h for more details
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* @param callback the function to callback when we are complete
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* @param data a string to pass unmodified to the callback function to help identifing this lookup
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*
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* @return returns 1 on success, 0 on failure (to add the lookup, not a successfull lookup
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*/
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int dns_lookup(char *str, adns_rrtype type,
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void (*callback) (char *data, adns_answer * a), char *data)
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{
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lnode_t *dnsnode;
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DnsLookup *dnsdata;
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int status;
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struct sockaddr_in sa;
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strcpy(segv_location, "dns_lookup");
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if (list_isfull(dnslist)) {
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nlog(LOG_ERROR, LOG_CORE, "DNS: Lookup list is full");
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return 0;
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}
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dnsdata = malloc(sizeof(DnsLookup));
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if (!dnsdata) {
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nlog(LOG_CRITICAL, LOG_CORE, "DNS: Out of Memory");
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return 0;
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}
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/* set the module name */
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strncpy(dnsdata->mod_name, segvinmodule, MAXHOST);
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strncpy(dnsdata->data, data, 254);
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dnsdata->callback = callback;
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if (type == adns_r_ptr) {
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sa.sin_family = AF_INET;
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sa.sin_addr.s_addr = inet_addr(str);
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status =
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adns_submit_reverse(ads, (const struct sockaddr *) &sa,
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type,
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adns_qf_owner |
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adns_qf_cname_loose, NULL,
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&dnsdata->q);
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} else {
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status =
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adns_submit(ads, str, type,
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adns_qf_owner | adns_qf_cname_loose, NULL,
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&dnsdata->q);
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}
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if (status) {
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nlog(LOG_WARNING, LOG_CORE, "DNS: adns_submit error: %s",
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strerror(status));
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free(dnsdata);
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return 0;
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}
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nlog(LOG_DEBUG1, LOG_CORE, "DNS: Added dns query %s to list",
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data);
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/* if we get here, then the submit was successfull. Add it to the list of queryies */
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dnsnode = lnode_create(dnsdata);
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list_append(dnslist, dnsnode);
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return 1;
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}
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/** @brief sets up DNS subsystem
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*
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* configures ADNS for use with NeoStats.
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*
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* @return returns 1 on success, 0 on failure
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*/
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int init_dns()
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{
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int adnsstart;
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strcpy(segv_location, "init_dns");
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dnslist = list_create(DNS_QUEUE_SIZE);
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if (!dnslist)
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return 0;
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#ifndef DEBUG
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adnsstart =
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adns_init(&ads, adns_if_noerrprint | adns_if_noautosys, 0);
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#else
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adnsstart = adns_init(&ads, adns_if_debug | adns_if_noautosys, 0);
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#endif
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if (adnsstart) {
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printf("ADNS init failed: %s\n", strerror(adnsstart));
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nlog(LOG_CRITICAL, LOG_CORE, "ADNS init failed: %s",
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strerror(adnsstart));
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return 0;
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}
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return 1;
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}
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/** @brief Checks for Completed DNS queries
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*
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* Goes through the dnslist of pending queries and calls the callback function for each lookup
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* with the adns_answer set. Always calls the callback function even if the lookup was unsuccessfull
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* its upto the callback function to make check the answer struct to see if it failed or not
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*
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* @return Nothing
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*/
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void do_dns()
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{
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lnode_t *dnsnode, *dnsnode1;
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int status;
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DnsLookup *dnsdata;
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strcpy(segv_location, "do_dns");
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/* if the list is empty, no use doing anything */
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if (list_isempty(dnslist))
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return;
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dnsnode = list_first(dnslist);
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while (dnsnode) {
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/* loop through the list */
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dnsdata = lnode_get(dnsnode);
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status = adns_check(ads, &dnsdata->q, &dnsdata->a, NULL);
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/* if status == eagain, the lookup hasn't completed yet */
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if (status == EAGAIN) {
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nlog(LOG_DEBUG2, LOG_CORE,
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"DNS: Lookup hasn't completed for %s",
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&dnsdata->data);
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dnsnode = list_next(dnslist, dnsnode);
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break;
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}
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/* there was a error */
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if (status) {
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nlog(LOG_CRITICAL, LOG_CORE,
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"DNS: Baaaad error on adns_check: %s. Please report to NeoStats Group",
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strerror(status));
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chanalert(s_Services,
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"Bad Error on DNS lookup. Please check logfile");
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/* set this so nlog works good */
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strncpy(segvinmodule, dnsdata->mod_name, MAXHOST);
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/* call the callback function with answer set to NULL */
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dnsdata->callback(dnsdata->data, NULL);
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strcpy(segvinmodule, "");
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/* delete from list */
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dnsnode1 = list_delete(dnslist, dnsnode);
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dnsnode = list_next(dnslist, dnsnode1);
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free(dnsdata->a);
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free(dnsdata);
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lnode_destroy(dnsnode1);
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break;
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}
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nlog(LOG_DEBUG2, LOG_CORE,
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"DNS: Calling callback function with data %s",
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dnsdata->data);
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strncpy(segvinmodule, dnsdata->mod_name, MAXHOST);
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/* call the callback function */
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dnsdata->callback(dnsdata->data, dnsdata->a);
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strcpy(segvinmodule, "");
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/* delete from list */
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dnsnode1 = list_delete(dnslist, dnsnode);
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dnsnode = list_next(dnslist, dnsnode1);
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free(dnsdata->a);
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free(dnsdata);
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lnode_destroy(dnsnode1);
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}
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}
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