2 * Copyright (c) 1998-2012 by the citadel.org team
4 * This program is open source software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License version 3.
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
18 * Inspired by NodeJS.org; thanks for the MX-Parser ;-)
30 #include <sys/types.h>
33 #if TIME_WITH_SYS_TIME
34 # include <sys/time.h>
38 # include <sys/time.h>
47 #include <sys/socket.h>
48 #include <netinet/in.h>
49 #include <arpa/inet.h>
51 #include <libcitadel.h>
54 #include "citserver.h"
57 #include "ctdl_module.h"
58 #include "event_client.h"
62 extern struct ev_loop *event_base;
64 void SockStateCb(void *data, int sock, int read, int write);
67 static void HostByAddrCb(void *data,
70 struct hostent *hostent)
74 EV_DNS_syslog(LOG_DEBUG, "C-ARES: %s\n", __FUNCTION__);
75 EV_DNS_LOGT_STOP(DNS.timeout);
77 ev_timer_stop (event_base, &IO->DNS.timeout);
79 IO->DNS.Query->DNSStatus = status;
80 if (status != ARES_SUCCESS) {
81 StrBufPlain(IO->ErrMsg, ares_strerror(status), -1);
84 IO->DNS.Query->Data = hostent;
87 static void ParseAnswerA(AsyncIO *IO, unsigned char* abuf, int alen)
89 struct hostent* host = NULL;
91 EV_DNS_syslog(LOG_DEBUG, "C-ARES: %s\n", __FUNCTION__);
93 if (IO->DNS.Query->VParsedDNSReply != NULL)
94 IO->DNS.Query->DNSReplyFree(IO->DNS.Query->VParsedDNSReply);
95 IO->DNS.Query->VParsedDNSReply = NULL;
97 IO->DNS.Query->DNSStatus = ares_parse_a_reply(abuf,
102 if (IO->DNS.Query->DNSStatus != ARES_SUCCESS) {
104 ares_free_hostent(host);
105 StrBufPlain(IO->ErrMsg,
106 ares_strerror(IO->DNS.Query->DNSStatus), -1);
109 IO->DNS.Query->VParsedDNSReply = host;
110 IO->DNS.Query->DNSReplyFree = (FreeDNSReply) ares_free_hostent;
114 static void ParseAnswerAAAA(AsyncIO *IO, unsigned char* abuf, int alen)
116 struct hostent* host = NULL;
118 EV_DNS_syslog(LOG_DEBUG, "C-ARES: %s\n", __FUNCTION__);
120 if (IO->DNS.Query->VParsedDNSReply != NULL)
121 IO->DNS.Query->DNSReplyFree(IO->DNS.Query->VParsedDNSReply);
122 IO->DNS.Query->VParsedDNSReply = NULL;
124 IO->DNS.Query->DNSStatus = ares_parse_aaaa_reply(abuf,
129 if (IO->DNS.Query->DNSStatus != ARES_SUCCESS) {
131 ares_free_hostent(host);
132 StrBufPlain(IO->ErrMsg,
133 ares_strerror(IO->DNS.Query->DNSStatus), -1);
136 IO->DNS.Query->VParsedDNSReply = host;
137 IO->DNS.Query->DNSReplyFree = (FreeDNSReply) ares_free_hostent;
141 static void ParseAnswerCNAME(AsyncIO *IO, unsigned char* abuf, int alen)
143 struct hostent* host = NULL;
145 EV_DNS_syslog(LOG_DEBUG, "C-ARES: %s\n", __FUNCTION__);
147 if (IO->DNS.Query->VParsedDNSReply != NULL)
148 IO->DNS.Query->DNSReplyFree(IO->DNS.Query->VParsedDNSReply);
149 IO->DNS.Query->VParsedDNSReply = NULL;
151 IO->DNS.Query->DNSStatus = ares_parse_a_reply(abuf,
156 if (IO->DNS.Query->DNSStatus != ARES_SUCCESS) {
158 ares_free_hostent(host);
159 StrBufPlain(IO->ErrMsg,
160 ares_strerror(IO->DNS.Query->DNSStatus), -1);
164 // a CNAME lookup always returns a single record but
165 IO->DNS.Query->VParsedDNSReply = host;
166 IO->DNS.Query->DNSReplyFree = (FreeDNSReply) ares_free_hostent;
170 static void ParseAnswerMX(AsyncIO *IO, unsigned char* abuf, int alen)
172 struct ares_mx_reply *mx_out = NULL;
174 EV_DNS_syslog(LOG_DEBUG, "C-ARES: %s\n", __FUNCTION__);
176 if (IO->DNS.Query->VParsedDNSReply != NULL)
177 IO->DNS.Query->DNSReplyFree(IO->DNS.Query->VParsedDNSReply);
178 IO->DNS.Query->VParsedDNSReply = NULL;
180 IO->DNS.Query->DNSStatus = ares_parse_mx_reply(abuf, alen, &mx_out);
181 if (IO->DNS.Query->DNSStatus != ARES_SUCCESS) {
183 ares_free_data(mx_out);
184 StrBufPlain(IO->ErrMsg,
185 ares_strerror(IO->DNS.Query->DNSStatus), -1);
189 IO->DNS.Query->VParsedDNSReply = mx_out;
190 IO->DNS.Query->DNSReplyFree = (FreeDNSReply) ares_free_data;
194 static void ParseAnswerNS(AsyncIO *IO, unsigned char* abuf, int alen)
196 struct hostent* host = NULL;
198 EV_DNS_syslog(LOG_DEBUG, "C-ARES: %s\n", __FUNCTION__);
200 if (IO->DNS.Query->VParsedDNSReply != NULL)
201 IO->DNS.Query->DNSReplyFree(IO->DNS.Query->VParsedDNSReply);
202 IO->DNS.Query->VParsedDNSReply = NULL;
204 IO->DNS.Query->DNSStatus = ares_parse_ns_reply(abuf, alen, &host);
205 if (IO->DNS.Query->DNSStatus != ARES_SUCCESS) {
207 ares_free_hostent(host);
208 StrBufPlain(IO->ErrMsg,
209 ares_strerror(IO->DNS.Query->DNSStatus), -1);
212 IO->DNS.Query->VParsedDNSReply = host;
213 IO->DNS.Query->DNSReplyFree = (FreeDNSReply) ares_free_hostent;
217 static void ParseAnswerSRV(AsyncIO *IO, unsigned char* abuf, int alen)
219 struct ares_srv_reply *srv_out = NULL;
221 EV_DNS_syslog(LOG_DEBUG, "C-ARES: %s\n", __FUNCTION__);
223 if (IO->DNS.Query->VParsedDNSReply != NULL)
224 IO->DNS.Query->DNSReplyFree(IO->DNS.Query->VParsedDNSReply);
225 IO->DNS.Query->VParsedDNSReply = NULL;
227 IO->DNS.Query->DNSStatus = ares_parse_srv_reply(abuf, alen, &srv_out);
228 if (IO->DNS.Query->DNSStatus != ARES_SUCCESS) {
230 ares_free_data(srv_out);
231 StrBufPlain(IO->ErrMsg,
232 ares_strerror(IO->DNS.Query->DNSStatus), -1);
236 IO->DNS.Query->VParsedDNSReply = srv_out;
237 IO->DNS.Query->DNSReplyFree = (FreeDNSReply) ares_free_data;
241 static void ParseAnswerTXT(AsyncIO *IO, unsigned char* abuf, int alen)
243 struct ares_txt_reply *txt_out;
245 EV_DNS_syslog(LOG_DEBUG, "C-ARES: %s\n", __FUNCTION__);
247 if (IO->DNS.Query->VParsedDNSReply != NULL)
248 IO->DNS.Query->DNSReplyFree(IO->DNS.Query->VParsedDNSReply);
249 IO->DNS.Query->VParsedDNSReply = NULL;
251 IO->DNS.Query->DNSStatus = ares_parse_txt_reply(abuf, alen, &txt_out);
252 if (IO->DNS.Query->DNSStatus != ARES_SUCCESS) {
254 ares_free_data(txt_out);
255 StrBufPlain(IO->ErrMsg,
256 ares_strerror(IO->DNS.Query->DNSStatus), -1);
259 IO->DNS.Query->VParsedDNSReply = txt_out;
260 IO->DNS.Query->DNSReplyFree = (FreeDNSReply) ares_free_data;
263 void QueryCb(void *arg,
271 EV_DNS_syslog(LOG_DEBUG, "C-ARES: %s\n", __FUNCTION__);
272 EV_DNS_LOGT_STOP(DNS.timeout);
274 ev_timer_stop (event_base, &IO->DNS.timeout);
276 IO->DNS.Query->DNSStatus = status;
277 if (status == ARES_SUCCESS)
278 IO->DNS.Query->DNS_CB(arg, abuf, alen);
280 EV_DNS_syslog(LOG_DEBUG, "C-ARES: Failed by: %s error %s\n",
282 ares_strerror(status));
283 StrBufPlain(IO->ErrMsg, ares_strerror(status), -1);
284 IO->DNS.Query->DNSStatus = status;
287 ev_idle_init(&IO->unwind_stack,
288 IO_postdns_callback);
289 IO->unwind_stack.data = IO;
290 EV_DNS_LOGT_INIT(unwind_stack);
291 EV_DNS_LOGT_START(unwind_stack);
292 ev_idle_start(event_base, &IO->unwind_stack);
295 void QueryCbDone(AsyncIO *IO)
297 EV_DNS_syslog(LOG_DEBUG, "C-ARES: %s\n", __FUNCTION__);
298 EV_DNS_LOGT_STOP(DNS.timeout);
300 ev_idle_stop(event_base, &IO->unwind_stack);
303 void DestructCAres(AsyncIO *IO)
305 EV_DNS_syslog(LOG_DEBUG, "C-ARES: %s\n", __FUNCTION__);
306 EV_DNS_LOGT_STOP(DNS.timeout);
308 EV_DNS_LOG_STOP(DNS.recv_event);
309 ev_io_stop(event_base, &IO->DNS.recv_event);
310 EV_DNS_LOG_STOP(DNS.send_event);
311 ev_io_stop(event_base, &IO->DNS.send_event);
312 ev_timer_stop (event_base, &IO->DNS.timeout);
313 ev_idle_stop(event_base, &IO->unwind_stack);
314 ares_destroy_options(&IO->DNS.Options);
318 void InitC_ares_dns(AsyncIO *IO)
322 EV_DNS_syslog(LOG_DEBUG, "C-ARES: %s %p\n", __FUNCTION__, IO->DNS.Channel);
324 if (IO->DNS.Channel == NULL) {
325 optmask |= ARES_OPT_SOCK_STATE_CB;
326 IO->DNS.Options.sock_state_cb = SockStateCb;
327 IO->DNS.Options.sock_state_cb_data = IO;
328 ares_init_options(&IO->DNS.Channel, &IO->DNS.Options, optmask);
330 IO->DNS.Query->DNSStatus = 0;
334 DNStimeouttrigger_callback(struct ev_loop *loop, ev_timer *watcher, int revents)
336 AsyncIO *IO = watcher->data;
337 struct timeval tv, MaxTV;
338 struct timeval *NextTV;
340 memset(&MaxTV, 0, sizeof(MaxTV));
341 memset(&tv, 0, sizeof(tv));
343 NextTV = ares_timeout(IO->DNS.Channel, &MaxTV, &tv);
345 if ((NextTV->tv_sec != MaxTV.tv_sec) ||
346 (NextTV->tv_usec != MaxTV.tv_usec))
348 fd_set readers, writers;
349 EV_DNS_syslog(LOG_DEBUG, "C-ARES: %s Timeout!\n", __FUNCTION__);
353 ares_fds(IO->DNS.Channel, &readers, &writers);
354 ares_process(IO->DNS.Channel, &readers, &writers);
358 void QueueGetHostByNameDone(void *Ctx,
361 struct hostent *hostent)
363 AsyncIO *IO = (AsyncIO *) Ctx;
365 EV_DNS_syslog(LOG_DEBUG, "C-ARES: %s\n", __FUNCTION__);
368 IO->DNS.Query->DNSStatus = status;
369 IO->DNS.Query->VParsedDNSReply = hostent;
370 IO->DNS.Query->DNSReplyFree = (FreeDNSReply) ares_free_hostent;
372 ev_idle_init(&IO->unwind_stack,
373 IO_postdns_callback);
374 IO->unwind_stack.data = IO;
375 EV_DNS_LOGT_INIT(unwind_stack);
376 EV_DNS_LOGT_START(unwind_stack);
377 ev_idle_start(event_base, &IO->unwind_stack);
378 ev_timer_stop (event_base, &IO->DNS.timeout);
381 void QueueGetHostByName(AsyncIO *IO,
382 const char *Hostname,
383 DNSQueryParts *QueryParts,
387 EV_DNS_syslog(LOG_DEBUG, "C-ARES: %s\n", __FUNCTION__);
388 IO->DNS.SourcePort = 0;
390 IO->DNS.Query = QueryParts;
391 IO->DNS.Query->PostDNS = PostDNS;
395 ev_timer_init(&IO->DNS.timeout, DNStimeouttrigger_callback, 10, 1);
396 EV_DNS_LOGT_INIT(DNS.timeout);
397 IO->DNS.timeout.data = IO;
398 ares_gethostbyname(IO->DNS.Channel,
400 AF_INET6, /* it falls back to ipv4 in doubt... */
401 QueueGetHostByNameDone,
403 EV_DNS_LOGT_START(DNS.timeout);
404 ev_timer_start(event_base, &IO->DNS.timeout);
408 int QueueQuery(ns_type Type,
411 DNSQueryParts *QueryParts,
415 char address_b[sizeof(struct in6_addr)];
417 IO->DNS.SourcePort = 0;
419 IO->DNS.Query = QueryParts;
420 IO->DNS.Query->PostDNS = PostDNS;
421 IO->DNS.Start = IO->Now;
425 ev_timer_init(&IO->DNS.timeout, DNStimeouttrigger_callback, 10, 1);
426 IO->DNS.timeout.data = IO;
427 EV_DNS_LOGT_INIT(DNS.timeout);
431 IO->DNS.Query->DNS_CB = ParseAnswerA;
435 IO->DNS.Query->DNS_CB = ParseAnswerAAAA;
439 IO->DNS.Query->DNS_CB = ParseAnswerMX;
443 IO->DNS.Query->DNS_CB = ParseAnswerNS;
447 IO->DNS.Query->DNS_CB = ParseAnswerTXT;
451 IO->DNS.Query->DNS_CB = ParseAnswerSRV;
455 IO->DNS.Query->DNS_CB = ParseAnswerCNAME;
461 if (inet_pton(AF_INET, name, &address_b) == 1) {
462 length = sizeof(struct in_addr);
464 } else if (inet_pton(AF_INET6, name, &address_b) == 1) {
465 length = sizeof(struct in6_addr);
471 ares_gethostbyaddr(IO->DNS.Channel,
477 EV_DNS_LOGT_START(DNS.timeout);
478 ev_timer_start(event_base, &IO->DNS.timeout);
480 EV_DNS_syslog(LOG_DEBUG, "C-ARES: %s X1\n", __FUNCTION__);
486 EV_DNS_syslog(LOG_DEBUG, "C-ARES: %sX2\n", __FUNCTION__);
489 EV_DNS_syslog(LOG_DEBUG, "C-ARES: %s\n", __FUNCTION__);
491 ares_query(IO->DNS.Channel, name, ns_c_in, Type, QueryCb, IO);
492 EV_DNS_LOGT_START(DNS.timeout);
493 ev_timer_start(event_base, &IO->DNS.timeout);
501 /*****************************************************************************
502 * libev / c-ares integration *
503 *****************************************************************************/
504 static void DNS_send_callback(struct ev_loop *loop, ev_io *watcher, int revents)
506 AsyncIO *IO = watcher->data;
508 IO->Now = ev_now(event_base);
510 EV_DNS_syslog(LOG_DEBUG, "C-ARES: %s\n", __FUNCTION__);
512 ares_process_fd(IO->DNS.Channel,
514 IO->DNS.send_event.fd);
516 static void DNS_recv_callback(struct ev_loop *loop, ev_io *watcher, int revents)
518 AsyncIO *IO = watcher->data;
520 IO->Now = ev_now(event_base);
522 EV_DNS_syslog(LOG_DEBUG, "C-ARES: %s\n", __FUNCTION__);
524 ares_process_fd(IO->DNS.Channel,
525 IO->DNS.recv_event.fd,
529 void SockStateCb(void *data, int sock, int read, int write)
532 /* already inside of the event queue. */
535 struct sockaddr_in sin = {};
538 if ((IO->DNS.SourcePort == 0) &&
539 (getsockname(sock, &sin, &slen) == 0))
541 IO->DNS.SourcePort = ntohs(sin.sin_port);
543 EV_DNS_syslog(LOG_DEBUG, "C-ARES: %s %d|%d Sock %d port %hu\n",
551 IO->Now = ev_now(event_base);
554 if ((IO->DNS.recv_event.fd != sock) &&
555 (IO->DNS.recv_event.fd != 0)) {
556 EV_DNS_LOG_STOP(DNS.recv_event);
557 ev_io_stop(event_base, &IO->DNS.recv_event);
559 IO->DNS.recv_event.fd = sock;
560 ev_io_init(&IO->DNS.recv_event,
562 IO->DNS.recv_event.fd,
564 EV_DNS_LOG_INIT(DNS.recv_event);
565 IO->DNS.recv_event.data = IO;
566 EV_DNS_LOG_START(DNS.recv_event);
567 ev_io_start(event_base, &IO->DNS.recv_event);
570 if ((IO->DNS.send_event.fd != sock) &&
571 (IO->DNS.send_event.fd != 0)) {
572 EV_DNS_LOG_STOP(DNS.send_event);
573 ev_io_stop(event_base, &IO->DNS.send_event);
575 IO->DNS.send_event.fd = sock;
576 ev_io_init(&IO->DNS.send_event,
578 IO->DNS.send_event.fd,
580 IO->DNS.send_event.data = IO;
581 EV_DNS_LOG_INIT(DNS.send_event);
582 EV_DNS_LOG_START(DNS.send_event);
583 ev_io_start(event_base, &IO->DNS.send_event);
585 if ((read == 0) && (write == 0)) {
586 EV_DNS_LOG_STOP(DNS.recv_event);
587 EV_DNS_LOG_STOP(DNS.send_event);
588 ev_io_stop(event_base, &IO->DNS.recv_event);
589 ev_io_stop(event_base, &IO->DNS.send_event);
592 void EnableDebugCAres(const int n)
597 CTDL_MODULE_INIT(c_ares_client)
601 CtdlRegisterDebugFlagHook(HKEY("cares"), EnableDebugCAres, &DebugCAres);
602 int r = ares_library_init(ARES_LIB_INIT_ALL);