-/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
-
/***
This file is part of systemd.
#include "alloc-util.h"
#include "dns-domain.h"
#include "resolved-dns-answer.h"
+#include "resolved-dns-dnssec.h"
#include "string-util.h"
DnsAnswer *dns_answer_new(unsigned n) {
return NULL;
}
-static int dns_answer_add_raw(DnsAnswer *a, DnsResourceRecord *rr, int ifindex) {
+static int dns_answer_add_raw(DnsAnswer *a, DnsResourceRecord *rr, int ifindex, DnsAnswerFlags flags) {
assert(rr);
if (!a)
if (a->n_rrs >= a->n_allocated)
return -ENOSPC;
- a->items[a->n_rrs].rr = dns_resource_record_ref(rr);
- a->items[a->n_rrs].ifindex = ifindex;
- a->n_rrs++;
+ a->items[a->n_rrs++] = (DnsAnswerItem) {
+ .rr = dns_resource_record_ref(rr),
+ .ifindex = ifindex,
+ .flags = flags,
+ };
return 1;
}
static int dns_answer_add_raw_all(DnsAnswer *a, DnsAnswer *source) {
DnsResourceRecord *rr;
+ DnsAnswerFlags flags;
int ifindex, r;
- DNS_ANSWER_FOREACH_IFINDEX(rr, ifindex, source) {
- r = dns_answer_add_raw(a, rr, ifindex);
+ DNS_ANSWER_FOREACH_FULL(rr, ifindex, flags, source) {
+ r = dns_answer_add_raw(a, rr, ifindex, flags);
if (r < 0)
return r;
}
return 0;
}
-int dns_answer_add(DnsAnswer *a, DnsResourceRecord *rr, int ifindex) {
+int dns_answer_add(DnsAnswer *a, DnsResourceRecord *rr, int ifindex, DnsAnswerFlags flags) {
unsigned i;
int r;
if (r < 0)
return r;
if (r > 0) {
- /* Entry already exists, keep the entry with
- * the higher RR, or the one with TTL 0 */
+ /* Don't mix contradicting TTLs (see below) */
+ if ((rr->ttl == 0) != (a->items[i].rr->ttl == 0))
+ return -EINVAL;
- if (rr->ttl == 0 || (rr->ttl > a->items[i].rr->ttl && a->items[i].rr->ttl != 0)) {
+ /* Entry already exists, keep the entry with
+ * the higher RR. */
+ if (rr->ttl > a->items[i].rr->ttl) {
dns_resource_record_ref(rr);
dns_resource_record_unref(a->items[i].rr);
a->items[i].rr = rr;
}
+ a->items[i].flags |= flags;
return 0;
}
+
+ r = dns_resource_key_equal(a->items[i].rr->key, rr->key);
+ if (r < 0)
+ return r;
+ if (r > 0) {
+ /* There's already an RR of the same RRset in
+ * place! Let's see if the TTLs more or less
+ * match. We don't really care if they match
+ * precisely, but we do care whether one is 0
+ * and the other is not. See RFC 2181, Section
+ * 5.2. */
+
+ if ((rr->ttl == 0) != (a->items[i].rr->ttl == 0))
+ return -EINVAL;
+ }
}
- return dns_answer_add_raw(a, rr, ifindex);
+ return dns_answer_add_raw(a, rr, ifindex, flags);
}
static int dns_answer_add_all(DnsAnswer *a, DnsAnswer *b) {
DnsResourceRecord *rr;
+ DnsAnswerFlags flags;
int ifindex, r;
- DNS_ANSWER_FOREACH_IFINDEX(rr, ifindex, b) {
- r = dns_answer_add(a, rr, ifindex);
+ DNS_ANSWER_FOREACH_FULL(rr, ifindex, flags, b) {
+ r = dns_answer_add(a, rr, ifindex, flags);
if (r < 0)
return r;
}
return 0;
}
-int dns_answer_add_extend(DnsAnswer **a, DnsResourceRecord *rr, int ifindex) {
+int dns_answer_add_extend(DnsAnswer **a, DnsResourceRecord *rr, int ifindex, DnsAnswerFlags flags) {
int r;
assert(a);
if (r < 0)
return r;
- return dns_answer_add(*a, rr, ifindex);
+ return dns_answer_add(*a, rr, ifindex, flags);
}
-int dns_answer_add_soa(DnsAnswer *a, const char *name, uint32_t ttl) {
+int dns_answer_add_soa(DnsAnswer *a, const char *name, uint32_t ttl, int ifindex) {
_cleanup_(dns_resource_record_unrefp) DnsResourceRecord *soa = NULL;
soa = dns_resource_record_new_full(DNS_CLASS_IN, DNS_TYPE_SOA, name);
soa->soa.expire = 1;
soa->soa.minimum = ttl;
- return dns_answer_add(a, soa, 0);
+ return dns_answer_add(a, soa, ifindex, DNS_ANSWER_AUTHENTICATED);
}
-int dns_answer_match_key(DnsAnswer *a, const DnsResourceKey *key) {
+int dns_answer_match_key(DnsAnswer *a, const DnsResourceKey *key, DnsAnswerFlags *ret_flags) {
+ DnsAnswerFlags flags = 0, i_flags;
DnsResourceRecord *i;
+ bool found = false;
int r;
assert(key);
- if (!a)
- return 0;
-
- DNS_ANSWER_FOREACH(i, a) {
+ DNS_ANSWER_FOREACH_FLAGS(i, i_flags, a) {
r = dns_resource_key_match_rr(key, i, NULL);
if (r < 0)
return r;
- if (r > 0)
+ if (r == 0)
+ continue;
+
+ if (!ret_flags)
return 1;
+
+ if (found)
+ flags &= i_flags;
+ else {
+ flags = i_flags;
+ found = true;
+ }
}
- return 0;
+ if (ret_flags)
+ *ret_flags = flags;
+
+ return found;
}
-int dns_answer_contains_rr(DnsAnswer *a, DnsResourceRecord *rr) {
+int dns_answer_contains_rr(DnsAnswer *a, DnsResourceRecord *rr, DnsAnswerFlags *ret_flags) {
+ DnsAnswerFlags flags = 0, i_flags;
DnsResourceRecord *i;
+ bool found = false;
int r;
assert(rr);
- DNS_ANSWER_FOREACH(i, a) {
+ DNS_ANSWER_FOREACH_FLAGS(i, i_flags, a) {
r = dns_resource_record_equal(i, rr);
if (r < 0)
return r;
- if (r > 0)
+ if (r == 0)
+ continue;
+
+ if (!ret_flags)
return 1;
+
+ if (found)
+ flags &= i_flags;
+ else {
+ flags = i_flags;
+ found = true;
+ }
}
- return 0;
+ if (ret_flags)
+ *ret_flags = flags;
+
+ return found;
}
-int dns_answer_find_soa(DnsAnswer *a, const DnsResourceKey *key, DnsResourceRecord **ret) {
- DnsResourceRecord *rr;
+int dns_answer_contains_key(DnsAnswer *a, const DnsResourceKey *key, DnsAnswerFlags *ret_flags) {
+ DnsAnswerFlags flags = 0, i_flags;
+ DnsResourceRecord *i;
+ bool found = false;
+ int r;
assert(key);
- assert(ret);
- if (!a)
- return 0;
+ DNS_ANSWER_FOREACH_FLAGS(i, i_flags, a) {
+ r = dns_resource_key_equal(i->key, key);
+ if (r < 0)
+ return r;
+ if (r == 0)
+ continue;
+
+ if (!ret_flags)
+ return true;
+
+ if (found)
+ flags &= i_flags;
+ else {
+ flags = i_flags;
+ found = true;
+ }
+ }
+
+ if (ret_flags)
+ *ret_flags = flags;
+
+ return found;
+}
+
+int dns_answer_contains_nsec_or_nsec3(DnsAnswer *a) {
+ DnsResourceRecord *i;
+
+ DNS_ANSWER_FOREACH(i, a) {
+ if (IN_SET(i->key->type, DNS_TYPE_NSEC, DNS_TYPE_NSEC3))
+ return true;
+ }
+
+ return false;
+}
+
+int dns_answer_contains_zone_nsec3(DnsAnswer *answer, const char *zone) {
+ DnsResourceRecord *rr;
+ int r;
+
+ /* Checks whether the specified answer contains at least one NSEC3 RR in the specified zone */
+
+ DNS_ANSWER_FOREACH(rr, answer) {
+ const char *p;
+
+ if (rr->key->type != DNS_TYPE_NSEC3)
+ continue;
+
+ p = dns_resource_key_name(rr->key);
+ r = dns_name_parent(&p);
+ if (r < 0)
+ return r;
+ if (r == 0)
+ continue;
+
+ r = dns_name_equal(p, zone);
+ if (r != 0)
+ return r;
+ }
+
+ return false;
+}
+
+int dns_answer_find_soa(DnsAnswer *a, const DnsResourceKey *key, DnsResourceRecord **ret, DnsAnswerFlags *flags) {
+ DnsResourceRecord *rr, *soa = NULL;
+ DnsAnswerFlags rr_flags, soa_flags = 0;
+ int r;
+
+ assert(key);
/* For a SOA record we can never find a matching SOA record */
if (key->type == DNS_TYPE_SOA)
return 0;
- DNS_ANSWER_FOREACH(rr, a) {
- if (dns_resource_key_match_soa(key, rr->key)) {
- *ret = rr;
+ DNS_ANSWER_FOREACH_FLAGS(rr, rr_flags, a) {
+ r = dns_resource_key_match_soa(key, rr->key);
+ if (r < 0)
+ return r;
+ if (r > 0) {
+
+ if (soa) {
+ r = dns_name_endswith(dns_resource_key_name(rr->key), dns_resource_key_name(soa->key));
+ if (r < 0)
+ return r;
+ if (r > 0)
+ continue;
+ }
+
+ soa = rr;
+ soa_flags = rr_flags;
+ }
+ }
+
+ if (!soa)
+ return 0;
+
+ if (ret)
+ *ret = soa;
+ if (flags)
+ *flags = soa_flags;
+
+ return 1;
+}
+
+int dns_answer_find_cname_or_dname(DnsAnswer *a, const DnsResourceKey *key, DnsResourceRecord **ret, DnsAnswerFlags *flags) {
+ DnsResourceRecord *rr;
+ DnsAnswerFlags rr_flags;
+ int r;
+
+ assert(key);
+
+ /* For a {C,D}NAME record we can never find a matching {C,D}NAME record */
+ if (!dns_type_may_redirect(key->type))
+ return 0;
+
+ DNS_ANSWER_FOREACH_FLAGS(rr, rr_flags, a) {
+ r = dns_resource_key_match_cname_or_dname(key, rr->key, NULL);
+ if (r < 0)
+ return r;
+ if (r > 0) {
+ if (ret)
+ *ret = rr;
+ if (flags)
+ *flags = rr_flags;
return 1;
}
}
if ((*a)->n_ref > 1) {
_cleanup_(dns_answer_unrefp) DnsAnswer *copy = NULL;
+ DnsAnswerFlags flags;
int ifindex;
copy = dns_answer_new((*a)->n_rrs);
if (!copy)
return -ENOMEM;
- DNS_ANSWER_FOREACH_IFINDEX(rr, ifindex, *a) {
+ DNS_ANSWER_FOREACH_FULL(rr, ifindex, flags, *a) {
r = dns_resource_key_equal(rr->key, key);
if (r < 0)
return r;
if (r > 0)
continue;
- r = dns_answer_add_raw(copy, rr, ifindex);
+ r = dns_answer_add_raw(copy, rr, ifindex, flags);
if (r < 0)
return r;
}
dns_resource_record_unref((*a)->items[i].rr);
memmove((*a)->items + i, (*a)->items + i + 1, sizeof(DnsAnswerItem) * ((*a)->n_rrs - i - 1));
- (*a)->n_rrs --;
+ (*a)->n_rrs--;
+ continue;
+
+ } else
+ /* Keep this entry */
+ i++;
+ }
+
+ return 1;
+}
+
+int dns_answer_remove_by_rr(DnsAnswer **a, DnsResourceRecord *rm) {
+ bool found = false, other = false;
+ DnsResourceRecord *rr;
+ unsigned i;
+ int r;
+
+ assert(a);
+ assert(rm);
+
+ /* Remove all entries matching the specified RR from *a */
+
+ DNS_ANSWER_FOREACH(rr, *a) {
+ r = dns_resource_record_equal(rr, rm);
+ if (r < 0)
+ return r;
+ if (r > 0)
+ found = true;
+ else
+ other = true;
+
+ if (found && other)
+ break;
+ }
+
+ if (!found)
+ return 0;
+
+ if (!other) {
+ *a = dns_answer_unref(*a); /* Return NULL for the empty answer */
+ return 1;
+ }
+
+ if ((*a)->n_ref > 1) {
+ _cleanup_(dns_answer_unrefp) DnsAnswer *copy = NULL;
+ DnsAnswerFlags flags;
+ int ifindex;
+
+ copy = dns_answer_new((*a)->n_rrs);
+ if (!copy)
+ return -ENOMEM;
+
+ DNS_ANSWER_FOREACH_FULL(rr, ifindex, flags, *a) {
+ r = dns_resource_record_equal(rr, rm);
+ if (r < 0)
+ return r;
+ if (r > 0)
+ continue;
+
+ r = dns_answer_add_raw(copy, rr, ifindex, flags);
+ if (r < 0)
+ return r;
+ }
+
+ dns_answer_unref(*a);
+ *a = copy;
+ copy = NULL;
+
+ return 1;
+ }
+
+ /* Only a single reference, edit in-place */
+
+ i = 0;
+ for (;;) {
+ if (i >= (*a)->n_rrs)
+ break;
+
+ r = dns_resource_record_equal((*a)->items[i].rr, rm);
+ if (r < 0)
+ return r;
+ if (r > 0) {
+ /* Kill this entry */
+
+ dns_resource_record_unref((*a)->items[i].rr);
+ memmove((*a)->items + i, (*a)->items + i + 1, sizeof(DnsAnswerItem) * ((*a)->n_rrs - i - 1));
+ (*a)->n_rrs--;
continue;
} else
return 1;
}
-int dns_answer_copy_by_key(DnsAnswer **a, DnsAnswer *source, const DnsResourceKey *key) {
+int dns_answer_copy_by_key(DnsAnswer **a, DnsAnswer *source, const DnsResourceKey *key, DnsAnswerFlags or_flags) {
DnsResourceRecord *rr_source;
int ifindex_source, r;
+ DnsAnswerFlags flags_source;
assert(a);
assert(key);
/* Copy all RRs matching the specified key from source into *a */
- DNS_ANSWER_FOREACH_IFINDEX(rr_source, ifindex_source, source) {
+ DNS_ANSWER_FOREACH_FULL(rr_source, ifindex_source, flags_source, source) {
r = dns_resource_key_equal(rr_source->key, key);
if (r < 0)
if (r < 0)
return r;
- r = dns_answer_add(*a, rr_source, ifindex_source);
+ r = dns_answer_add(*a, rr_source, ifindex_source, flags_source|or_flags);
if (r < 0)
return r;
}
return 0;
}
+int dns_answer_move_by_key(DnsAnswer **to, DnsAnswer **from, const DnsResourceKey *key, DnsAnswerFlags or_flags) {
+ int r;
+
+ assert(to);
+ assert(from);
+ assert(key);
+
+ r = dns_answer_copy_by_key(to, *from, key, or_flags);
+ if (r < 0)
+ return r;
+
+ return dns_answer_remove_by_key(from, key);
+}
+
void dns_answer_order_by_scope(DnsAnswer *a, bool prefer_link_local) {
DnsAnswerItem *items;
unsigned i, start, end;
if (a->items[i].rr->key->class == DNS_CLASS_IN &&
((a->items[i].rr->key->type == DNS_TYPE_A && in_addr_is_link_local(AF_INET, (union in_addr_union*) &a->items[i].rr->a.in_addr) != prefer_link_local) ||
(a->items[i].rr->key->type == DNS_TYPE_AAAA && in_addr_is_link_local(AF_INET6, (union in_addr_union*) &a->items[i].rr->aaaa.in6_addr) != prefer_link_local)))
- /* Order address records that are are not preferred to the end of the array */
+ /* Order address records that are not preferred to the end of the array */
items[end--] = a->items[i];
else
/* Order all other records to the beginning of the array */
assert(a);
/* Tries to extend the DnsAnswer object. And if that's not
- * possibly, since we are not the sole owner, then allocate a
+ * possible, since we are not the sole owner, then allocate a
* new, appropriately sized one. Either way, after this call
* the object will only have a single reference, and has room
* for at least the specified number of RRs. */
return 0;
}
+
+void dns_answer_dump(DnsAnswer *answer, FILE *f) {
+ DnsResourceRecord *rr;
+ DnsAnswerFlags flags;
+ int ifindex;
+
+ if (!f)
+ f = stdout;
+
+ DNS_ANSWER_FOREACH_FULL(rr, ifindex, flags, answer) {
+ const char *t;
+
+ fputc('\t', f);
+
+ t = dns_resource_record_to_string(rr);
+ if (!t) {
+ log_oom();
+ continue;
+ }
+
+ fputs(t, f);
+
+ if (ifindex != 0 || flags & (DNS_ANSWER_AUTHENTICATED|DNS_ANSWER_CACHEABLE|DNS_ANSWER_SHARED_OWNER))
+ fputs("\t;", f);
+
+ if (ifindex != 0)
+ printf(" ifindex=%i", ifindex);
+ if (flags & DNS_ANSWER_AUTHENTICATED)
+ fputs(" authenticated", f);
+ if (flags & DNS_ANSWER_CACHEABLE)
+ fputs(" cachable", f);
+ if (flags & DNS_ANSWER_SHARED_OWNER)
+ fputs(" shared-owner", f);
+
+ fputc('\n', f);
+ }
+}
+
+bool dns_answer_has_dname_for_cname(DnsAnswer *a, DnsResourceRecord *cname) {
+ DnsResourceRecord *rr;
+ int r;
+
+ assert(cname);
+
+ /* Checks whether the answer contains a DNAME record that indicates that the specified CNAME record is
+ * synthesized from it */
+
+ if (cname->key->type != DNS_TYPE_CNAME)
+ return 0;
+
+ DNS_ANSWER_FOREACH(rr, a) {
+ _cleanup_free_ char *n = NULL;
+
+ if (rr->key->type != DNS_TYPE_DNAME)
+ continue;
+ if (rr->key->class != cname->key->class)
+ continue;
+
+ r = dns_name_change_suffix(cname->cname.name, rr->dname.name, dns_resource_key_name(rr->key), &n);
+ if (r < 0)
+ return r;
+ if (r == 0)
+ continue;
+
+ r = dns_name_equal(n, dns_resource_key_name(cname->key));
+ if (r < 0)
+ return r;
+ if (r > 0)
+ return 1;
+
+ }
+
+ return 0;
+}
projects / thirdparty / systemd.git / blobdiff