| 1 | /*
|
|---|
| 2 | * Copyright (c) 2014 Mike Belopuhov
|
|---|
| 3 | * Copyright (c) 2014 Eric Faurot <eric@faurot.net>
|
|---|
| 4 | *
|
|---|
| 5 | * Permission to use, copy, modify, and distribute this software for any
|
|---|
| 6 | * purpose with or without fee is hereby granted, provided that the above
|
|---|
| 7 | * copyright notice and this permission notice appear in all copies.
|
|---|
| 8 | *
|
|---|
| 9 | * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
|
|---|
| 10 | * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
|
|---|
| 11 | * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
|
|---|
| 12 | * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
|
|---|
| 13 | * WHATSOEVER RESULTING FROM LOSS OF MIND, USE, DATA OR PROFITS, WHETHER IN
|
|---|
| 14 | * AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
|
|---|
| 15 | * OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
|
|---|
| 16 | */
|
|---|
| 17 |
|
|---|
| 18 | #include <sys/types.h>
|
|---|
| 19 | #include <sys/socket.h>
|
|---|
| 20 | #include <sys/time.h>
|
|---|
| 21 | #include <netinet/in.h>
|
|---|
| 22 | #include <netdb.h>
|
|---|
| 23 | #include <errno.h>
|
|---|
| 24 | #include <event.h>
|
|---|
| 25 | #include <resolv.h>
|
|---|
| 26 | #include <stdlib.h>
|
|---|
| 27 | #include <string.h>
|
|---|
| 28 | #include <syslog.h>
|
|---|
| 29 |
|
|---|
| 30 | #include <asr.h>
|
|---|
| 31 |
|
|---|
| 32 | #include "icb.h"
|
|---|
| 33 | #include "icbd.h"
|
|---|
| 34 |
|
|---|
| 35 | void dns_done_host(struct asr_result *, void *);
|
|---|
| 36 | void dns_done_reverse(struct asr_result *, void *);
|
|---|
| 37 |
|
|---|
| 38 | extern int dodns;
|
|---|
| 39 |
|
|---|
| 40 | void
|
|---|
| 41 | dns_done_host(struct asr_result *ar, void *arg)
|
|---|
| 42 | {
|
|---|
| 43 | struct icb_session *is = arg;
|
|---|
| 44 |
|
|---|
| 45 | if (ar->ar_addrinfo)
|
|---|
| 46 | freeaddrinfo(ar->ar_addrinfo);
|
|---|
| 47 |
|
|---|
| 48 | /* just check that there's no error */
|
|---|
| 49 | if (ar->ar_gai_errno == 0) {
|
|---|
| 50 | if (strncmp(is->hostname, "localhost",
|
|---|
| 51 | sizeof "localhost" - 1) == 0)
|
|---|
| 52 | strlcpy(is->host, "unknown", ICB_MAXHOSTLEN);
|
|---|
| 53 | else if (strlen(is->hostname) < ICB_MAXHOSTLEN)
|
|---|
| 54 | strlcpy(is->host, is->hostname, ICB_MAXHOSTLEN);
|
|---|
| 55 | } else
|
|---|
| 56 | icbd_log(is, LOG_WARNING, "dns resolution failed: %s",
|
|---|
| 57 | gai_strerror(ar->ar_gai_errno));
|
|---|
| 58 | }
|
|---|
| 59 |
|
|---|
| 60 | void
|
|---|
| 61 | dns_done_reverse(struct asr_result *ar, void *arg)
|
|---|
| 62 | {
|
|---|
| 63 | struct icb_session *is = arg;
|
|---|
| 64 | struct asr_query *as;
|
|---|
| 65 | struct addrinfo hints;
|
|---|
| 66 |
|
|---|
| 67 | if (ar->ar_gai_errno == 0) {
|
|---|
| 68 | icbd_log(is, LOG_DEBUG, "reverse dns resolved %s to %s",
|
|---|
| 69 | is->host, is->hostname);
|
|---|
| 70 | /* try to verify that it resolves back */
|
|---|
| 71 | memset(&hints, 0, sizeof(hints));
|
|---|
| 72 | hints.ai_family = PF_UNSPEC;
|
|---|
| 73 | as = getaddrinfo_async(is->hostname, NULL, &hints, NULL);
|
|---|
| 74 | event_asr_run(as, dns_done_host, is);
|
|---|
| 75 | } else
|
|---|
| 76 | icbd_log(is, LOG_WARNING, "reverse dns resolution failed: %s",
|
|---|
| 77 | gai_strerror(ar->ar_gai_errno));
|
|---|
| 78 | }
|
|---|
| 79 |
|
|---|
| 80 | void
|
|---|
| 81 | dns_resolve(struct icb_session *is, struct sockaddr *sa)
|
|---|
| 82 | {
|
|---|
| 83 | struct asr_query *as;
|
|---|
| 84 |
|
|---|
| 85 | if (!dodns)
|
|---|
| 86 | return;
|
|---|
| 87 |
|
|---|
| 88 | if (verbose)
|
|---|
| 89 | icbd_log(is, LOG_DEBUG, "resolving: %s", is->host);
|
|---|
| 90 |
|
|---|
| 91 | as = getnameinfo_async(sa, sa->sa_len, is->hostname,
|
|---|
| 92 | sizeof is->hostname, NULL, 0, NI_NOFQDN, NULL);
|
|---|
| 93 | event_asr_run(as, dns_done_reverse, is);
|
|---|
| 94 | }
|
|---|
| 95 |
|
|---|
