[thirdparty/systemd.git] / src / resolve / resolved-etc-hosts.c

/* SPDX-License-Identifier: LGPL-2.1+ */

#include "fd-util.h"
#include "fileio.h"
#include "hostname-util.h"
#include "resolved-etc-hosts.h"
#include "resolved-dns-synthesize.h"
#include "string-util.h"
#include "strv.h"
#include "time-util.h"

/* Recheck /etc/hosts at most once every 2s */
#define ETC_HOSTS_RECHECK_USEC (2*USEC_PER_SEC)

typedef struct EtcHostsItem {
        int family;
        union in_addr_union address;

        char **names;
} EtcHostsItem;

typedef struct EtcHostsItemByName {
        char *name;

        EtcHostsItem **items;
        size_t n_items, n_allocated;
} EtcHostsItemByName;

void manager_etc_hosts_flush(Manager *m) {
        EtcHostsItem *item;
        EtcHostsItemByName *bn;

        while ((item = set_steal_first(m->etc_hosts_by_address))) {
                strv_free(item->names);
                free(item);
        }

        while ((bn = hashmap_steal_first(m->etc_hosts_by_name))) {
                free(bn->name);
                free(bn->items);
                free(bn);
        }

        m->etc_hosts_by_address = set_free(m->etc_hosts_by_address);
        m->etc_hosts_by_name = hashmap_free(m->etc_hosts_by_name);

        m->etc_hosts_mtime = USEC_INFINITY;
}

static void etc_hosts_item_hash_func(const void *p, struct siphash *state) {
        const EtcHostsItem *item = p;

        siphash24_compress(&item->family, sizeof(item->family), state);

        if (item->family == AF_INET)
                siphash24_compress(&item->address.in, sizeof(item->address.in), state);
        else if (item->family == AF_INET6)
                siphash24_compress(&item->address.in6, sizeof(item->address.in6), state);
}

static int etc_hosts_item_compare_func(const void *a, const void *b) {
        const EtcHostsItem *x = a, *y = b;

        if (x->family != y->family)
                return x->family - y->family;

        if (x->family == AF_INET)
                return memcmp(&x->address.in.s_addr, &y->address.in.s_addr, sizeof(struct in_addr));

        if (x->family == AF_INET6)
                return memcmp(&x->address.in6.s6_addr, &y->address.in6.s6_addr, sizeof(struct in6_addr));

        return trivial_compare_func(a, b);
}

static const struct hash_ops etc_hosts_item_ops = {
        .hash = etc_hosts_item_hash_func,
        .compare = etc_hosts_item_compare_func,
};

static int add_item(Manager *m, int family, const union in_addr_union *address, char **names) {

        EtcHostsItem key = {
                .family = family,
                .address = *address,
        };
        EtcHostsItem *item;
        char **n;
        int r;

        assert(m);
        assert(address);

        r = in_addr_is_null(family, address);
        if (r < 0)
                return r;
        if (r > 0)
                /* This is an 0.0.0.0 or :: item, which we assume means that we shall map the specified hostname to
                 * nothing. */
                item = NULL;
        else {
                /* If this is a normal address, then, simply add entry mapping it to the specified names */

                item = set_get(m->etc_hosts_by_address, &key);
                if (item) {
                        r = strv_extend_strv(&item->names, names, true);
                        if (r < 0)
                                return log_oom();
                } else {

                        r = set_ensure_allocated(&m->etc_hosts_by_address, &etc_hosts_item_ops);
                        if (r < 0)
                                return log_oom();

                        item = new0(EtcHostsItem, 1);
                        if (!item)
                                return log_oom();

                        item->family = family;
                        item->address = *address;
                        item->names = names;

                        r = set_put(m->etc_hosts_by_address, item);
                        if (r < 0) {
                                free(item);
                                return log_oom();
                        }
                }
        }

        STRV_FOREACH(n, names) {
                EtcHostsItemByName *bn;

                bn = hashmap_get(m->etc_hosts_by_name, *n);
                if (!bn) {
                        r = hashmap_ensure_allocated(&m->etc_hosts_by_name, &dns_name_hash_ops);
                        if (r < 0)
                                return log_oom();

                        bn = new0(EtcHostsItemByName, 1);
                        if (!bn)
                                return log_oom();

                        bn->name = strdup(*n);
                        if (!bn->name) {
                                free(bn);
                                return log_oom();
                        }

                        r = hashmap_put(m->etc_hosts_by_name, bn->name, bn);
                        if (r < 0) {
                                free(bn->name);
                                free(bn);
                                return log_oom();
                        }
                }

                if (item) {
                        if (!GREEDY_REALLOC(bn->items, bn->n_allocated, bn->n_items+1))
                                return log_oom();

                        bn->items[bn->n_items++] = item;
                }
        }

        return 0;
}

static int parse_line(Manager *m, unsigned nr, const char *line) {
        _cleanup_free_ char *address = NULL;
        _cleanup_strv_free_ char **names = NULL;
        union in_addr_union in;
        bool suppressed = false;
        int family, r;

        assert(m);
        assert(line);

        r = extract_first_word(&line, &address, NULL, EXTRACT_RELAX);
        if (r < 0)
                return log_error_errno(r, "Couldn't extract address, in line /etc/hosts:%u.", nr);
        if (r == 0) {
                log_error("Premature end of line, in line /etc/hosts:%u.", nr);
                return -EINVAL;
        }

        r = in_addr_from_string_auto(address, &family, &in);
        if (r < 0)
                return log_error_errno(r, "Address '%s' is invalid, in line /etc/hosts:%u.", address, nr);

        for (;;) {
                _cleanup_free_ char *name = NULL;

                r = extract_first_word(&line, &name, NULL, EXTRACT_RELAX);
                if (r < 0)
                        return log_error_errno(r, "Couldn't extract host name, in line /etc/hosts:%u.", nr);
                if (r == 0)
                        break;

                r = dns_name_is_valid(name);
                if (r <= 0)
                        return log_error_errno(r, "Hostname %s is not valid, ignoring, in line /etc/hosts:%u.", name, nr);

                if (is_localhost(name)) {
                        /* Suppress the "localhost" line that is often seen */
                        suppressed = true;
                        continue;
                }

                r = strv_push(&names, name);
                if (r < 0)
                        return log_oom();

                name = NULL;
        }

        if (strv_isempty(names)) {

                if (suppressed)
                        return 0;

                log_error("Line is missing any host names, in line /etc/hosts:%u.", nr);
                return -EINVAL;
        }

        /* Takes possession of the names strv */
        r = add_item(m, family, &in, names);
        if (r < 0)
                return r;

        names = NULL;
        return r;
}

int manager_etc_hosts_read(Manager *m) {
        _cleanup_fclose_ FILE *f = NULL;
        char line[LINE_MAX];
        struct stat st;
        usec_t ts;
        unsigned nr = 0;
        int r;

        assert_se(sd_event_now(m->event, clock_boottime_or_monotonic(), &ts) >= 0);

        /* See if we checked /etc/hosts recently already */
        if (m->etc_hosts_last != USEC_INFINITY && m->etc_hosts_last + ETC_HOSTS_RECHECK_USEC > ts)
                return 0;

        m->etc_hosts_last = ts;

        if (m->etc_hosts_mtime != USEC_INFINITY) {
                if (stat("/etc/hosts", &st) < 0) {
                        if (errno == ENOENT) {
                                r = 0;
                                goto clear;
                        }

                        return log_error_errno(errno, "Failed to stat /etc/hosts: %m");
                }

                /* Did the mtime change? If not, there's no point in re-reading the file. */
                if (timespec_load(&st.st_mtim) == m->etc_hosts_mtime)
                        return 0;
        }

        f = fopen("/etc/hosts", "re");
        if (!f) {
                if (errno == ENOENT) {
                        r = 0;
                        goto clear;
                }

                return log_error_errno(errno, "Failed to open /etc/hosts: %m");
        }

        /* Take the timestamp at the beginning of processing, so that any changes made later are read on the next
         * invocation */
        r = fstat(fileno(f), &st);
        if (r < 0)
                return log_error_errno(errno, "Failed to fstat() /etc/hosts: %m");

        manager_etc_hosts_flush(m);

        FOREACH_LINE(line, f, return log_error_errno(errno, "Failed to read /etc/hosts: %m")) {
                char *l;

                nr++;

                l = strstrip(line);
                if (isempty(l))
                        continue;
                if (l[0] == '#')
                        continue;

                r = parse_line(m, nr, l);
                if (r == -ENOMEM) /* On OOM we abandon the half-built-up structure. All other errors we ignore and proceed */
                        goto clear;
        }

        m->etc_hosts_mtime = timespec_load(&st.st_mtim);
        m->etc_hosts_last = ts;

        return 1;

clear:
        manager_etc_hosts_flush(m);
        return r;
}

int manager_etc_hosts_lookup(Manager *m, DnsQuestion* q, DnsAnswer **answer) {
        bool found_a = false, found_aaaa = false;
        EtcHostsItemByName *bn;
        EtcHostsItem k = {};
        DnsResourceKey *t;
        const char *name;
        unsigned i;
        int r;

        assert(m);
        assert(q);
        assert(answer);

        r = manager_etc_hosts_read(m);
        if (r < 0)
                return r;

        name = dns_question_first_name(q);
        if (!name)
                return 0;

        r = dns_name_address(name, &k.family, &k.address);
        if (r > 0) {
                EtcHostsItem *item;
                DnsResourceKey *found_ptr = NULL;

                item = set_get(m->etc_hosts_by_address, &k);
                if (!item)
                        return 0;

                /* We have an address in /etc/hosts that matches the queried name. Let's return successful. Actual data
                 * we'll only return if the request was for PTR. */

                DNS_QUESTION_FOREACH(t, q) {
                        if (!IN_SET(t->type, DNS_TYPE_PTR, DNS_TYPE_ANY))
                                continue;
                        if (!IN_SET(t->class, DNS_CLASS_IN, DNS_CLASS_ANY))
                                continue;

                        r = dns_name_equal(dns_resource_key_name(t), name);
                        if (r < 0)
                                return r;
                        if (r > 0) {
                                found_ptr = t;
                                break;
                        }
                }

                if (found_ptr) {
                        char **n;

                        r = dns_answer_reserve(answer, strv_length(item->names));
                        if (r < 0)
                                return r;

                        STRV_FOREACH(n, item->names) {
                                _cleanup_(dns_resource_record_unrefp) DnsResourceRecord *rr = NULL;

                                rr = dns_resource_record_new(found_ptr);
                                if (!rr)
                                        return -ENOMEM;

                                rr->ptr.name = strdup(*n);
                                if (!rr->ptr.name)
                                        return -ENOMEM;

                                r = dns_answer_add(*answer, rr, 0, DNS_ANSWER_AUTHENTICATED);
                                if (r < 0)
                                        return r;
                        }
                }

                return 1;
        }

        bn = hashmap_get(m->etc_hosts_by_name, name);
        if (!bn)
                return 0;

        r = dns_answer_reserve(answer, bn->n_items);
        if (r < 0)
                return r;

        DNS_QUESTION_FOREACH(t, q) {
                if (!IN_SET(t->type, DNS_TYPE_A, DNS_TYPE_AAAA, DNS_TYPE_ANY))
                        continue;
                if (!IN_SET(t->class, DNS_CLASS_IN, DNS_CLASS_ANY))
                        continue;

                r = dns_name_equal(dns_resource_key_name(t), name);
                if (r < 0)
                        return r;
                if (r == 0)
                        continue;

                if (IN_SET(t->type, DNS_TYPE_A, DNS_TYPE_ANY))
                        found_a = true;
                if (IN_SET(t->type, DNS_TYPE_AAAA, DNS_TYPE_ANY))
                        found_aaaa = true;

                if (found_a && found_aaaa)
                        break;
        }

        for (i = 0; i < bn->n_items; i++) {
                _cleanup_(dns_resource_record_unrefp) DnsResourceRecord *rr = NULL;

                if ((!found_a && bn->items[i]->family == AF_INET) ||
                    (!found_aaaa && bn->items[i]->family == AF_INET6))
                        continue;

                r = dns_resource_record_new_address(&rr, bn->items[i]->family, &bn->items[i]->address, bn->name);
                if (r < 0)
                        return r;

                r = dns_answer_add(*answer, rr, 0, DNS_ANSWER_AUTHENTICATED);
                if (r < 0)
                        return r;
        }

        return found_a || found_aaaa;
}
Commit	Line	Data
53e1b683	1	/* SPDX-License-Identifier: LGPL-2.1+ */
dd0bc0f1 LP	2
	3	#include "fd-util.h"
	4	#include "fileio.h"
	5	#include "hostname-util.h"
	6	#include "resolved-etc-hosts.h"
	7	#include "resolved-dns-synthesize.h"
	8	#include "string-util.h"
	9	#include "strv.h"
	10	#include "time-util.h"
	11
	12	/* Recheck /etc/hosts at most once every 2s */
	13	#define ETC_HOSTS_RECHECK_USEC (2*USEC_PER_SEC)
	14
	15	typedef struct EtcHostsItem {
	16	int family;
	17	union in_addr_union address;
	18
	19	char **names;
	20	} EtcHostsItem;
	21
	22	typedef struct EtcHostsItemByName {
	23	char *name;
	24
	25	EtcHostsItem **items;
	26	size_t n_items, n_allocated;
	27	} EtcHostsItemByName;
	28
	29	void manager_etc_hosts_flush(Manager *m) {
	30	EtcHostsItem *item;
	31	EtcHostsItemByName *bn;
	32
	33	while ((item = set_steal_first(m->etc_hosts_by_address))) {
	34	strv_free(item->names);
	35	free(item);
	36	}
	37
	38	while ((bn = hashmap_steal_first(m->etc_hosts_by_name))) {
	39	free(bn->name);
	40	free(bn->items);
	41	free(bn);
	42	}
	43
	44	m->etc_hosts_by_address = set_free(m->etc_hosts_by_address);
	45	m->etc_hosts_by_name = hashmap_free(m->etc_hosts_by_name);
	46
	47	m->etc_hosts_mtime = USEC_INFINITY;
	48	}
	49
	50	static void etc_hosts_item_hash_func(const void p, struct siphash state) {
	51	const EtcHostsItem *item = p;
	52
	53	siphash24_compress(&item->family, sizeof(item->family), state);
	54
	55	if (item->family == AF_INET)
	56	siphash24_compress(&item->address.in, sizeof(item->address.in), state);
	57	else if (item->family == AF_INET6)
	58	siphash24_compress(&item->address.in6, sizeof(item->address.in6), state);
	59	}
	60
	61	static int etc_hosts_item_compare_func(const void a, const void b) {
	62	const EtcHostsItem x = a, y = b;
	63
ec76e139	64	if (x->family != y->family)
dd0bc0f1 LP	65	return x->family - y->family;
	66
	67	if (x->family == AF_INET)
	68	return memcmp(&x->address.in.s_addr, &y->address.in.s_addr, sizeof(struct in_addr));
	69
	70	if (x->family == AF_INET6)
	71	return memcmp(&x->address.in6.s6_addr, &y->address.in6.s6_addr, sizeof(struct in6_addr));
	72
	73	return trivial_compare_func(a, b);
	74	}
	75
	76	static const struct hash_ops etc_hosts_item_ops = {
	77	.hash = etc_hosts_item_hash_func,
	78	.compare = etc_hosts_item_compare_func,
	79	};
	80
	81	static int add_item(Manager m, int family, const union in_addr_union address, char **names) {
	82
	83	EtcHostsItem key = {
	84	.family = family,
	85	.address = *address,
	86	};
	87	EtcHostsItem *item;
	88	char **n;
	89	int r;
	90
	91	assert(m);
	92	assert(address);
	93
	94	r = in_addr_is_null(family, address);
	95	if (r < 0)
	96	return r;
	97	if (r > 0)
	98	/* This is an 0.0.0.0 or :: item, which we assume means that we shall map the specified hostname to
	99	* nothing. */
	100	item = NULL;
	101	else {
	102	/* If this is a normal address, then, simply add entry mapping it to the specified names */
	103
	104	item = set_get(m->etc_hosts_by_address, &key);
	105	if (item) {
	106	r = strv_extend_strv(&item->names, names, true);
	107	if (r < 0)
	108	return log_oom();
	109	} else {
	110
	111	r = set_ensure_allocated(&m->etc_hosts_by_address, &etc_hosts_item_ops);
	112	if (r < 0)
	113	return log_oom();
	114
	115	item = new0(EtcHostsItem, 1);
	116	if (!item)
	117	return log_oom();
	118
	119	item->family = family;
	120	item->address = *address;
	121	item->names = names;
	122
	123	r = set_put(m->etc_hosts_by_address, item);
	124	if (r < 0) {
	125	free(item);
	126	return log_oom();
	127	}
	128	}
129	}
130
131	STRV_FOREACH(n, names) {
132	EtcHostsItemByName *bn;
133
134	bn = hashmap_get(m->etc_hosts_by_name, *n);
135	if (!bn) {
136	r = hashmap_ensure_allocated(&m->etc_hosts_by_name, &dns_name_hash_ops);
137	if (r < 0)
138	return log_oom();
139
140	bn = new0(EtcHostsItemByName, 1);
141	if (!bn)
142	return log_oom();
143
144	bn->name = strdup(*n);
145	if (!bn->name) {
146	free(bn);
147	return log_oom();
148	}
149
150	r = hashmap_put(m->etc_hosts_by_name, bn->name, bn);
151	if (r < 0) {
152	free(bn->name);
153	free(bn);
154	return log_oom();
155	}
156	}
157
158	if (item) {
159	if (!GREEDY_REALLOC(bn->items, bn->n_allocated, bn->n_items+1))
160	return log_oom();
161
162	bn->items[bn->n_items++] = item;
163	}
164	}
165
166	return 0;
167	}
168
169	static int parse_line(Manager m, unsigned nr, const char line) {
170	_cleanup_free_ char *address = NULL;
171	_cleanup_strv_free_ char **names = NULL;
172	union in_addr_union in;
173	bool suppressed = false;
174	int family, r;
175
176	assert(m);
177	assert(line);
178
179	r = extract_first_word(&line, &address, NULL, EXTRACT_RELAX);
180	if (r < 0)
181	return log_error_errno(r, "Couldn't extract address, in line /etc/hosts:%u.", nr);
182	if (r == 0) {
183	log_error("Premature end of line, in line /etc/hosts:%u.", nr);
184	return -EINVAL;
185	}
186
187	r = in_addr_from_string_auto(address, &family, &in);
188	if (r < 0)
189	return log_error_errno(r, "Address '%s' is invalid, in line /etc/hosts:%u.", address, nr);
190
191	for (;;) {
192	_cleanup_free_ char *name = NULL;
193
194	r = extract_first_word(&line, &name, NULL, EXTRACT_RELAX);
195	if (r < 0)
196	return log_error_errno(r, "Couldn't extract host name, in line /etc/hosts:%u.", nr);
197	if (r == 0)
198	break;
199
200	r = dns_name_is_valid(name);
201	if (r <= 0)
202	return log_error_errno(r, "Hostname %s is not valid, ignoring, in line /etc/hosts:%u.", name, nr);
203
204	if (is_localhost(name)) {
205	/* Suppress the "localhost" line that is often seen */
206	suppressed = true;
207	continue;
208	}
209
210	r = strv_push(&names, name);
211	if (r < 0)
212	return log_oom();
213
214	name = NULL;
215	}
216
217	if (strv_isempty(names)) {
218
219	if (suppressed)
220	return 0;
221
222	log_error("Line is missing any host names, in line /etc/hosts:%u.", nr);
223	return -EINVAL;
224	}
225
226	/* Takes possession of the names strv */
227	r = add_item(m, family, &in, names);
228	if (r < 0)
229	return r;
230
231	names = NULL;
232	return r;
233	}
234
235	int manager_etc_hosts_read(Manager *m) {
236	_cleanup_fclose_ FILE *f = NULL;
237	char line[LINE_MAX];
238	struct stat st;
239	usec_t ts;
240	unsigned nr = 0;
241	int r;
242
243	assert_se(sd_event_now(m->event, clock_boottime_or_monotonic(), &ts) >= 0);
244
245	/* See if we checked /etc/hosts recently already */
246	if (m->etc_hosts_last != USEC_INFINITY && m->etc_hosts_last + ETC_HOSTS_RECHECK_USEC > ts)
247	return 0;
248
249	m->etc_hosts_last = ts;
250
251	if (m->etc_hosts_mtime != USEC_INFINITY) {
252	if (stat("/etc/hosts", &st) < 0) {
253	if (errno == ENOENT) {
254	r = 0;
255	goto clear;
256	}
257
258	return log_error_errno(errno, "Failed to stat /etc/hosts: %m");
259	}
260
261	/* Did the mtime change? If not, there's no point in re-reading the file. */
262	if (timespec_load(&st.st_mtim) == m->etc_hosts_mtime)
263	return 0;
264	}
265
266	f = fopen("/etc/hosts", "re");
267	if (!f) {
268	if (errno == ENOENT) {
269	r = 0;
270	goto clear;
271	}
272
273	return log_error_errno(errno, "Failed to open /etc/hosts: %m");
274	}
275
276	/* Take the timestamp at the beginning of processing, so that any changes made later are read on the next
277	* invocation */
278	r = fstat(fileno(f), &st);
279	if (r < 0)
280	return log_error_errno(errno, "Failed to fstat() /etc/hosts: %m");
281
282	manager_etc_hosts_flush(m);
283
284	FOREACH_LINE(line, f, return log_error_errno(errno, "Failed to read /etc/hosts: %m")) {
285	char *l;
286
313cefa1	287	nr++;
dd0bc0f1 LP	288
	289	l = strstrip(line);
	290	if (isempty(l))
	291	continue;
	292	if (l[0] == '#')
	293	continue;
	294
	295	r = parse_line(m, nr, l);
	296	if (r == -ENOMEM) /* On OOM we abandon the half-built-up structure. All other errors we ignore and proceed */
	297	goto clear;
	298	}
	299
	300	m->etc_hosts_mtime = timespec_load(&st.st_mtim);
	301	m->etc_hosts_last = ts;
	302
	303	return 1;
	304
	305	clear:
	306	manager_etc_hosts_flush(m);
	307	return r;
	308	}
	309
	310	int manager_etc_hosts_lookup(Manager m, DnsQuestion q, DnsAnswer **answer) {
	311	bool found_a = false, found_aaaa = false;
	312	EtcHostsItemByName *bn;
	313	EtcHostsItem k = {};
	314	DnsResourceKey *t;
	315	const char *name;
	316	unsigned i;
	317	int r;
	318
	319	assert(m);
	320	assert(q);
	321	assert(answer);
	322
	323	r = manager_etc_hosts_read(m);
	324	if (r < 0)
	325	return r;
	326
	327	name = dns_question_first_name(q);
	328	if (!name)
	329	return 0;
	330
	331	r = dns_name_address(name, &k.family, &k.address);
	332	if (r > 0) {
	333	EtcHostsItem *item;
	334	DnsResourceKey *found_ptr = NULL;
	335
	336	item = set_get(m->etc_hosts_by_address, &k);
	337	if (!item)
	338	return 0;
	339
	340	/* We have an address in /etc/hosts that matches the queried name. Let's return successful. Actual data
	341	* we'll only return if the request was for PTR. */
	342
	343	DNS_QUESTION_FOREACH(t, q) {
	344	if (!IN_SET(t->type, DNS_TYPE_PTR, DNS_TYPE_ANY))
	345	continue;
	346	if (!IN_SET(t->class, DNS_CLASS_IN, DNS_CLASS_ANY))
	347	continue;
	348
1c02e7ba	349	r = dns_name_equal(dns_resource_key_name(t), name);
dd0bc0f1 LP	350	if (r < 0)
	351	return r;
	352	if (r > 0) {
	353	found_ptr = t;
	354	break;
	355	}
	356	}
	357
	358	if (found_ptr) {
	359	char **n;
	360
	361	r = dns_answer_reserve(answer, strv_length(item->names));
	362	if (r < 0)
	363	return r;
	364
	365	STRV_FOREACH(n, item->names) {
	366	_cleanup_(dns_resource_record_unrefp) DnsResourceRecord *rr = NULL;
	367
	368	rr = dns_resource_record_new(found_ptr);
	369	if (!rr)
	370	return -ENOMEM;
	371
	372	rr->ptr.name = strdup(*n);
	373	if (!rr->ptr.name)
	374	return -ENOMEM;
	375
	376	r = dns_answer_add(*answer, rr, 0, DNS_ANSWER_AUTHENTICATED);
	377	if (r < 0)
	378	return r;
	379	}
	380	}
	381
	382	return 1;
	383	}
	384
	385	bn = hashmap_get(m->etc_hosts_by_name, name);
	386	if (!bn)
	387	return 0;
	388
	389	r = dns_answer_reserve(answer, bn->n_items);
	390	if (r < 0)
	391	return r;
	392
	393	DNS_QUESTION_FOREACH(t, q) {
	394	if (!IN_SET(t->type, DNS_TYPE_A, DNS_TYPE_AAAA, DNS_TYPE_ANY))
	395	continue;
	396	if (!IN_SET(t->class, DNS_CLASS_IN, DNS_CLASS_ANY))
	397	continue;
	398
1c02e7ba	399	r = dns_name_equal(dns_resource_key_name(t), name);
dd0bc0f1 LP	400	if (r < 0)
	401	return r;
	402	if (r == 0)
	403	continue;
	404
	405	if (IN_SET(t->type, DNS_TYPE_A, DNS_TYPE_ANY))
	406	found_a = true;
	407	if (IN_SET(t->type, DNS_TYPE_AAAA, DNS_TYPE_ANY))
	408	found_aaaa = true;
	409
	410	if (found_a && found_aaaa)
	411	break;
	412	}
	413
	414	for (i = 0; i < bn->n_items; i++) {
	415	_cleanup_(dns_resource_record_unrefp) DnsResourceRecord *rr = NULL;
	416
4050e04b MP	417	if ((!found_a && bn->items[i]->family == AF_INET) \|\|
4050e04b MP	418	(!found_aaaa && bn->items[i]->family == AF_INET6))
dd0bc0f1 LP	419	continue;
	420
	421	r = dns_resource_record_new_address(&rr, bn->items[i]->family, &bn->items[i]->address, bn->name);
	422	if (r < 0)
	423	return r;
	424
	425	r = dns_answer_add(*answer, rr, 0, DNS_ANSWER_AUTHENTICATED);
	426	if (r < 0)
	427	return r;
	428	}
	429
4050e04b	430	return found_a \|\| found_aaaa;
dd0bc0f1	431	}