[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-dns-synthesize.h"
#include "resolved-etc-hosts.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)

static void etc_hosts_item_free(EtcHostsItem *item) {
        strv_free(item->names);
        free(item);
}

static void etc_hosts_item_by_name_free(EtcHostsItemByName *item) {
        free(item->name);
        free(item->addresses);
        free(item);
}

void etc_hosts_free(EtcHosts *hosts) {
        hosts->by_address = hashmap_free_with_destructor(hosts->by_address, etc_hosts_item_free);
        hosts->by_name = hashmap_free_with_destructor(hosts->by_name, etc_hosts_item_by_name_free);
        hosts->no_address = set_free_free(hosts->no_address);
}

void manager_etc_hosts_flush(Manager *m) {
        etc_hosts_free(&m->etc_hosts);
        m->etc_hosts_mtime = USEC_INFINITY;
}

static int parse_line(EtcHosts *hosts, unsigned nr, const char *line) {
        _cleanup_free_ char *address_str = NULL;
        struct in_addr_data address = {};
        bool found = false;
        EtcHostsItem *item;
        int r;

        assert(hosts);
        assert(line);

        r = extract_first_word(&line, &address_str, NULL, EXTRACT_RELAX);
        if (r < 0)
                return log_error_errno(r, "/etc/hosts:%u: failed to extract address: %m", nr);
        assert(r > 0); /* We already checked that the line is not empty, so it should contain *something* */

        r = in_addr_ifindex_from_string_auto(address_str, &address.family, &address.address, NULL);
        if (r < 0) {
                log_warning_errno(r, "/etc/hosts:%u: address '%s' is invalid, ignoring: %m", nr, address_str);
                return 0;
        }

        r = in_addr_is_null(address.family, &address.address);
        if (r < 0) {
                log_warning_errno(r, "/etc/hosts:%u: address '%s' is invalid, ignoring: %m", nr, address_str);
                return 0;
        }
        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 = hashmap_get(hosts->by_address, &address);
                if (!item) {
                        r = hashmap_ensure_allocated(&hosts->by_address, &in_addr_data_hash_ops);
                        if (r < 0)
                                return log_oom();

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

                        item->address = address;

                        r = hashmap_put(hosts->by_address, &item->address, item);
                        if (r < 0) {
                                free(item);
                                return log_oom();
                        }
                }
        }

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

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

                found = true;

                r = dns_name_is_valid_ldh(name);
                if (r <= 0) {
                        log_warning_errno(r, "/etc/hosts:%u: hostname \"%s\" is not valid, ignoring.", nr, name);
                        continue;
                }

                if (is_localhost(name))
                        /* Suppress the "localhost" line that is often seen */
                        continue;

                if (!item) {
                        /* Optimize the case where we don't need to store any addresses, by storing
                         * only the name in a dedicated Set instead of the hashmap */

                        r = set_ensure_allocated(&hosts->no_address, &dns_name_hash_ops);
                        if (r < 0)
                                return log_oom();

                        r = set_put(hosts->no_address, name);
                        if (r < 0)
                                return r;

                        TAKE_PTR(name);
                        continue;
                }

                r = strv_extend(&item->names, name);
                if (r < 0)
                        return log_oom();

                bn = hashmap_get(hosts->by_name, name);
                if (!bn) {
                        r = hashmap_ensure_allocated(&hosts->by_name, &dns_name_hash_ops);
                        if (r < 0)
                                return log_oom();

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

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

                        bn->name = TAKE_PTR(name);
                }

                if (!GREEDY_REALLOC(bn->addresses, bn->n_allocated, bn->n_addresses + 1))
                        return log_oom();

                bn->addresses[bn->n_addresses++] = &item->address;
        }

        if (!found)
                log_warning("/etc/hosts:%u: line is missing any host names", nr);

        return 0;
}

int etc_hosts_parse(EtcHosts *hosts, FILE *f) {
        _cleanup_(etc_hosts_free) EtcHosts t = {};
        unsigned nr = 0;
        int r;

        for (;;) {
                _cleanup_free_ char *line = NULL;
                char *l;

                r = read_line(f, LONG_LINE_MAX, &line);
                if (r < 0)
                        return log_error_errno(r, "Failed to read /etc/hosts: %m");
                if (r == 0)
                        break;

                nr++;

                l = strchr(line, '#');
                if (l)
                        *l = '\0';

                l = strstrip(line);
                if (isempty(l))
                        continue;

                r = parse_line(&t, nr, l);
                if (r < 0)
                        return r;
        }

        etc_hosts_free(hosts);
        *hosts = t;
        t = (EtcHosts) {}; /* prevent cleanup */
        return 0;
}

static int manager_etc_hosts_read(Manager *m) {
        _cleanup_fclose_ FILE *f = NULL;
        struct stat st;
        usec_t ts;
        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)
                                return log_error_errno(errno, "Failed to stat /etc/hosts: %m");

                        manager_etc_hosts_flush(m);
                        return 0;
                }

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

                manager_etc_hosts_flush(m);
                return 0;
        }

        /* 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");

        r = etc_hosts_parse(&m->etc_hosts, f);
        if (r < 0)
                return r;

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

        return 1;
}

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

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

        if (!m->read_etc_hosts)
                return 0;

        (void) manager_etc_hosts_read(m);

        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 = hashmap_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) {
                r = dns_answer_reserve(answer, bn->n_addresses);
                if (r < 0)
                        return r;
        } else {
                /* Check if name was listed with no address. If yes, continue to return an answer. */
                if (!set_contains(m->etc_hosts.no_address, name))
                        return 0;
        }

        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; bn && i < bn->n_addresses; i++) {
                _cleanup_(dns_resource_record_unrefp) DnsResourceRecord *rr = NULL;

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

                r = dns_resource_record_new_address(&rr, bn->addresses[i]->family, &bn->addresses[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"
dd0bc0f1	6	#include "resolved-dns-synthesize.h"
7c777a77	7	#include "resolved-etc-hosts.h"
dd0bc0f1 LP	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
a1e92eee	15	static void etc_hosts_item_free(EtcHostsItem *item) {
37b7cc8d ZJS	16	strv_free(item->names);
	17	free(item);
	18	}
dd0bc0f1	19
a1e92eee	20	static void etc_hosts_item_by_name_free(EtcHostsItemByName *item) {
37b7cc8d ZJS	21	free(item->name);
	22	free(item->addresses);
	23	free(item);
	24	}
dd0bc0f1	25
78fc21a1	26	void etc_hosts_free(EtcHosts *hosts) {
37b7cc8d ZJS	27	hosts->by_address = hashmap_free_with_destructor(hosts->by_address, etc_hosts_item_free);
37b7cc8d ZJS	28	hosts->by_name = hashmap_free_with_destructor(hosts->by_name, etc_hosts_item_by_name_free);
fd373593	29	hosts->no_address = set_free_free(hosts->no_address);
37b7cc8d	30	}
dd0bc0f1	31
37b7cc8d ZJS	32	void manager_etc_hosts_flush(Manager *m) {
37b7cc8d ZJS	33	etc_hosts_free(&m->etc_hosts);
dd0bc0f1 LP	34	m->etc_hosts_mtime = USEC_INFINITY;
	35	}
	36
37b7cc8d	37	static int parse_line(EtcHosts hosts, unsigned nr, const char line) {
0351eb11 YW	38	_cleanup_free_ char *address_str = NULL;
0351eb11 YW	39	struct in_addr_data address = {};
fd373593	40	bool found = false;
dd0bc0f1	41	EtcHostsItem *item;
dd0bc0f1 LP	42	int r;
dd0bc0f1 LP	43
37b7cc8d	44	assert(hosts);
0351eb11	45	assert(line);
dd0bc0f1	46
0351eb11 YW	47	r = extract_first_word(&line, &address_str, NULL, EXTRACT_RELAX);
0351eb11 YW	48	if (r < 0)
bd005277 ZJS	49	return log_error_errno(r, "/etc/hosts:%u: failed to extract address: %m", nr);
bd005277 ZJS	50	assert(r > 0); /* We already checked that the line is not empty, so it should contain something */
0351eb11	51
7bf8c3de	52	r = in_addr_ifindex_from_string_auto(address_str, &address.family, &address.address, NULL);
bd005277 ZJS	53	if (r < 0) {
	54	log_warning_errno(r, "/etc/hosts:%u: address '%s' is invalid, ignoring: %m", nr, address_str);
	55	return 0;
	56	}
0351eb11 YW	57
0351eb11 YW	58	r = in_addr_is_null(address.family, &address.address);
bd005277 ZJS	59	if (r < 0) {
	60	log_warning_errno(r, "/etc/hosts:%u: address '%s' is invalid, ignoring: %m", nr, address_str);
	61	return 0;
	62	}
dd0bc0f1 LP	63	if (r > 0)
	64	/* This is an 0.0.0.0 or :: item, which we assume means that we shall map the specified hostname to
	65	* nothing. */
	66	item = NULL;
	67	else {
78fc21a1	68	/* If this is a normal address, then simply add entry mapping it to the specified names */
dd0bc0f1	69
37b7cc8d	70	item = hashmap_get(hosts->by_address, &address);
0351eb11	71	if (!item) {
37b7cc8d	72	r = hashmap_ensure_allocated(&hosts->by_address, &in_addr_data_hash_ops);
dd0bc0f1 LP	73	if (r < 0)
	74	return log_oom();
	75
0351eb11	76	item = new0(EtcHostsItem, 1);
dd0bc0f1 LP	77	if (!item)
	78	return log_oom();
	79
0351eb11	80	item->address = address;
dd0bc0f1	81
37b7cc8d	82	r = hashmap_put(hosts->by_address, &item->address, item);
dd0bc0f1 LP	83	if (r < 0) {
	84	free(item);
	85	return log_oom();
	86	}
	87	}
	88	}
	89
0351eb11 YW	90	for (;;) {
0351eb11 YW	91	_cleanup_free_ char *name = NULL;
dd0bc0f1 LP	92	EtcHostsItemByName *bn;
dd0bc0f1 LP	93
0351eb11 YW	94	r = extract_first_word(&line, &name, NULL, EXTRACT_RELAX);
0351eb11 YW	95	if (r < 0)
bd005277	96	return log_error_errno(r, "/etc/hosts:%u: couldn't extract host name: %m", nr);
0351eb11 YW	97	if (r == 0)
	98	break;
	99
fd373593 ZJS	100	found = true;
fd373593 ZJS	101
7470cc4c	102	r = dns_name_is_valid_ldh(name);
bd005277 ZJS	103	if (r <= 0) {
	104	log_warning_errno(r, "/etc/hosts:%u: hostname \"%s\" is not valid, ignoring.", nr, name);
	105	continue;
	106	}
	107
fd373593	108	if (is_localhost(name))
0351eb11	109	/* Suppress the "localhost" line that is often seen */
0351eb11	110	continue;
0351eb11	111
fd373593 ZJS	112	if (!item) {
	113	/* Optimize the case where we don't need to store any addresses, by storing
	114	* only the name in a dedicated Set instead of the hashmap */
	115
	116	r = set_ensure_allocated(&hosts->no_address, &dns_name_hash_ops);
0351eb11 YW	117	if (r < 0)
0351eb11 YW	118	return log_oom();
fd373593 ZJS	119
	120	r = set_put(hosts->no_address, name);
	121	if (r < 0)
	122	return r;
	123
	124	TAKE_PTR(name);
	125	continue;
0351eb11 YW	126	}
0351eb11 YW	127
fd373593 ZJS	128	r = strv_extend(&item->names, name);
	129	if (r < 0)
	130	return log_oom();
	131
37b7cc8d	132	bn = hashmap_get(hosts->by_name, name);
dd0bc0f1	133	if (!bn) {
37b7cc8d	134	r = hashmap_ensure_allocated(&hosts->by_name, &dns_name_hash_ops);
dd0bc0f1 LP	135	if (r < 0)
	136	return log_oom();
	137
	138	bn = new0(EtcHostsItemByName, 1);
	139	if (!bn)
	140	return log_oom();
	141
37b7cc8d	142	r = hashmap_put(hosts->by_name, name, bn);
dd0bc0f1	143	if (r < 0) {
dd0bc0f1 LP	144	free(bn);
	145	return log_oom();
	146	}
0351eb11 YW	147
0351eb11 YW	148	bn->name = TAKE_PTR(name);
dd0bc0f1 LP	149	}
dd0bc0f1 LP	150
fd373593 ZJS	151	if (!GREEDY_REALLOC(bn->addresses, bn->n_allocated, bn->n_addresses + 1))
fd373593 ZJS	152	return log_oom();
dd0bc0f1	153
fd373593	154	bn->addresses[bn->n_addresses++] = &item->address;
dd0bc0f1 LP	155	}
dd0bc0f1 LP	156
baaa35ad	157	if (!found)
bd005277	158	log_warning("/etc/hosts:%u: line is missing any host names", nr);
dd0bc0f1	159
0351eb11	160	return 0;
dd0bc0f1 LP	161	}
dd0bc0f1 LP	162
78fc21a1	163	int etc_hosts_parse(EtcHosts hosts, FILE f) {
37b7cc8d	164	_cleanup_(etc_hosts_free) EtcHosts t = {};
37b7cc8d ZJS	165	unsigned nr = 0;
	166	int r;
	167
7c777a77 LP	168	for (;;) {
7c777a77 LP	169	_cleanup_free_ char *line = NULL;
37b7cc8d ZJS	170	char *l;
37b7cc8d ZJS	171
7c777a77 LP	172	r = read_line(f, LONG_LINE_MAX, &line);
	173	if (r < 0)
	174	return log_error_errno(r, "Failed to read /etc/hosts: %m");
	175	if (r == 0)
	176	break;
	177
37b7cc8d ZJS	178	nr++;
37b7cc8d ZJS	179
bd005277 ZJS	180	l = strchr(line, '#');
	181	if (l)
	182	*l = '\0';
	183
37b7cc8d ZJS	184	l = strstrip(line);
	185	if (isempty(l))
	186	continue;
37b7cc8d ZJS	187
	188	r = parse_line(&t, nr, l);
	189	if (r < 0)
	190	return r;
	191	}
	192
be19cdf3	193	etc_hosts_free(hosts);
37b7cc8d ZJS	194	*hosts = t;
	195	t = (EtcHosts) {}; /* prevent cleanup */
	196	return 0;
	197	}
	198
452ca091	199	static int manager_etc_hosts_read(Manager *m) {
dd0bc0f1	200	_cleanup_fclose_ FILE *f = NULL;
dd0bc0f1 LP	201	struct stat st;
dd0bc0f1 LP	202	usec_t ts;
dd0bc0f1 LP	203	int r;
	204
	205	assert_se(sd_event_now(m->event, clock_boottime_or_monotonic(), &ts) >= 0);
	206
	207	/* See if we checked /etc/hosts recently already */
	208	if (m->etc_hosts_last != USEC_INFINITY && m->etc_hosts_last + ETC_HOSTS_RECHECK_USEC > ts)
	209	return 0;
	210
	211	m->etc_hosts_last = ts;
	212
	213	if (m->etc_hosts_mtime != USEC_INFINITY) {
	214	if (stat("/etc/hosts", &st) < 0) {
37b7cc8d ZJS	215	if (errno != ENOENT)
37b7cc8d ZJS	216	return log_error_errno(errno, "Failed to stat /etc/hosts: %m");
dd0bc0f1	217
37b7cc8d ZJS	218	manager_etc_hosts_flush(m);
37b7cc8d ZJS	219	return 0;
dd0bc0f1 LP	220	}
	221
	222	/* Did the mtime change? If not, there's no point in re-reading the file. */
	223	if (timespec_load(&st.st_mtim) == m->etc_hosts_mtime)
	224	return 0;
	225	}
	226
	227	f = fopen("/etc/hosts", "re");
	228	if (!f) {
37b7cc8d ZJS	229	if (errno != ENOENT)
37b7cc8d ZJS	230	return log_error_errno(errno, "Failed to open /etc/hosts: %m");
dd0bc0f1	231
37b7cc8d ZJS	232	manager_etc_hosts_flush(m);
37b7cc8d ZJS	233	return 0;
dd0bc0f1 LP	234	}
	235
	236	/* Take the timestamp at the beginning of processing, so that any changes made later are read on the next
	237	* invocation */
	238	r = fstat(fileno(f), &st);
	239	if (r < 0)
	240	return log_error_errno(errno, "Failed to fstat() /etc/hosts: %m");
	241
37b7cc8d	242	r = etc_hosts_parse(&m->etc_hosts, f);
be19cdf3	243	if (r < 0)
37b7cc8d	244	return r;
dd0bc0f1 LP	245
	246	m->etc_hosts_mtime = timespec_load(&st.st_mtim);
	247	m->etc_hosts_last = ts;
	248
	249	return 1;
dd0bc0f1 LP	250	}
	251
	252	int manager_etc_hosts_lookup(Manager m, DnsQuestion q, DnsAnswer **answer) {
	253	bool found_a = false, found_aaaa = false;
0351eb11	254	struct in_addr_data k = {};
dd0bc0f1	255	EtcHostsItemByName *bn;
dd0bc0f1 LP	256	DnsResourceKey *t;
	257	const char *name;
	258	unsigned i;
	259	int r;
	260
	261	assert(m);
	262	assert(q);
	263	assert(answer);
	264
86317087 YW	265	if (!m->read_etc_hosts)
	266	return 0;
	267
be19cdf3	268	(void) manager_etc_hosts_read(m);
dd0bc0f1 LP	269
	270	name = dns_question_first_name(q);
	271	if (!name)
	272	return 0;
	273
	274	r = dns_name_address(name, &k.family, &k.address);
	275	if (r > 0) {
	276	EtcHostsItem *item;
	277	DnsResourceKey *found_ptr = NULL;
	278
37b7cc8d	279	item = hashmap_get(m->etc_hosts.by_address, &k);
dd0bc0f1 LP	280	if (!item)
	281	return 0;
	282
	283	/* We have an address in /etc/hosts that matches the queried name. Let's return successful. Actual data
	284	* we'll only return if the request was for PTR. */
	285
	286	DNS_QUESTION_FOREACH(t, q) {
	287	if (!IN_SET(t->type, DNS_TYPE_PTR, DNS_TYPE_ANY))
	288	continue;
	289	if (!IN_SET(t->class, DNS_CLASS_IN, DNS_CLASS_ANY))
	290	continue;
	291
1c02e7ba	292	r = dns_name_equal(dns_resource_key_name(t), name);
dd0bc0f1 LP	293	if (r < 0)
	294	return r;
	295	if (r > 0) {
	296	found_ptr = t;
	297	break;
	298	}
	299	}
	300
	301	if (found_ptr) {
	302	char **n;
	303
	304	r = dns_answer_reserve(answer, strv_length(item->names));
	305	if (r < 0)
	306	return r;
	307
	308	STRV_FOREACH(n, item->names) {
	309	_cleanup_(dns_resource_record_unrefp) DnsResourceRecord *rr = NULL;
	310
	311	rr = dns_resource_record_new(found_ptr);
	312	if (!rr)
	313	return -ENOMEM;
	314
	315	rr->ptr.name = strdup(*n);
	316	if (!rr->ptr.name)
	317	return -ENOMEM;
	318
	319	r = dns_answer_add(*answer, rr, 0, DNS_ANSWER_AUTHENTICATED);
	320	if (r < 0)
	321	return r;
	322	}
	323	}
	324
	325	return 1;
	326	}
	327
37b7cc8d	328	bn = hashmap_get(m->etc_hosts.by_name, name);
fd373593 ZJS	329	if (bn) {
	330	r = dns_answer_reserve(answer, bn->n_addresses);
	331	if (r < 0)
	332	return r;
	333	} else {
	334	/* Check if name was listed with no address. If yes, continue to return an answer. */
	335	if (!set_contains(m->etc_hosts.no_address, name))
	336	return 0;
	337	}
dd0bc0f1 LP	338
	339	DNS_QUESTION_FOREACH(t, q) {
	340	if (!IN_SET(t->type, DNS_TYPE_A, DNS_TYPE_AAAA, DNS_TYPE_ANY))
	341	continue;
	342	if (!IN_SET(t->class, DNS_CLASS_IN, DNS_CLASS_ANY))
	343	continue;
	344
1c02e7ba	345	r = dns_name_equal(dns_resource_key_name(t), name);
dd0bc0f1 LP	346	if (r < 0)
	347	return r;
	348	if (r == 0)
	349	continue;
	350
	351	if (IN_SET(t->type, DNS_TYPE_A, DNS_TYPE_ANY))
	352	found_a = true;
	353	if (IN_SET(t->type, DNS_TYPE_AAAA, DNS_TYPE_ANY))
	354	found_aaaa = true;
	355
	356	if (found_a && found_aaaa)
	357	break;
	358	}
	359
fd373593	360	for (i = 0; bn && i < bn->n_addresses; i++) {
dd0bc0f1 LP	361	_cleanup_(dns_resource_record_unrefp) DnsResourceRecord *rr = NULL;
dd0bc0f1 LP	362
0351eb11 YW	363	if ((!found_a && bn->addresses[i]->family == AF_INET) \|\|
0351eb11 YW	364	(!found_aaaa && bn->addresses[i]->family == AF_INET6))
dd0bc0f1 LP	365	continue;
dd0bc0f1 LP	366
0351eb11	367	r = dns_resource_record_new_address(&rr, bn->addresses[i]->family, &bn->addresses[i]->address, bn->name);
dd0bc0f1 LP	368	if (r < 0)
	369	return r;
	370
	371	r = dns_answer_add(*answer, rr, 0, DNS_ANSWER_AUTHENTICATED);
	372	if (r < 0)
	373	return r;
	374	}
	375
4050e04b	376	return found_a \|\| found_aaaa;
dd0bc0f1	377	}