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resolved: add dns_question_merge() helper

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Very similar to dns_answer_merge(), but for DnsQuestion objects instead
of DnsAnswer.
This commit is contained in:
Lennart Poettering 2022-09-29 18:26:44 +02:00
parent 1482c86a50
commit 4d593fb151
2 changed files with 60 additions and 0 deletions
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58
src/resolve/resolved-dns-question.c
View file

@ -50,6 +50,19 @@ int dns_question_add_raw(DnsQuestion *q, DnsResourceKey *key, DnsQuestionFlags f
return 0;
}
static int dns_question_add_raw_all(DnsQuestion *a, DnsQuestion *b) {
DnsQuestionItem *item;
int r;
DNS_QUESTION_FOREACH_ITEM(item, b) {
r = dns_question_add_raw(a, item->key, item->flags);
if (r < 0)
return r;
}
return 0;
}
int dns_question_add(DnsQuestion *q, DnsResourceKey *key, DnsQuestionFlags flags) {
DnsQuestionItem *item;
int r;
@ -71,6 +84,19 @@ int dns_question_add(DnsQuestion *q, DnsResourceKey *key, DnsQuestionFlags flags
return dns_question_add_raw(q, key, flags);
}
static int dns_question_add_all(DnsQuestion *a, DnsQuestion *b) {
DnsQuestionItem *item;
int r;
DNS_QUESTION_FOREACH_ITEM(item, b) {
r = dns_question_add(a, item->key, item->flags);
if (r < 0)
return r;
}
return 0;
}
int dns_question_matches_rr(DnsQuestion *q, DnsResourceRecord *rr, const char *search_domain) {
DnsResourceKey *key;
int r;
@ -486,3 +512,35 @@ void dns_question_dump(DnsQuestion *question, FILE *f) {
fputc('\n', f);
}
}
int dns_question_merge(DnsQuestion *a, DnsQuestion *b, DnsQuestion **ret) {
_cleanup_(dns_question_unrefp) DnsQuestion *k = NULL;
int r;
assert(ret);
if (a == b || dns_question_size(b) <= 0) {
*ret = dns_question_ref(a);
return 0;
}
if (dns_question_size(a) <= 0) {
*ret = dns_question_ref(b);
return 0;
}
k = dns_question_new(dns_question_size(a) + dns_question_size(b));
if (!k)
return -ENOMEM;
r = dns_question_add_raw_all(k, a);
if (r < 0)
return r;
r = dns_question_add_all(k, b);
if (r < 0)
return r;
*ret = TAKE_PTR(k);
return 0;
}

2
src/resolve/resolved-dns-question.h
View file

@ -59,6 +59,8 @@ static inline bool dns_question_isempty(DnsQuestion *q) {
return dns_question_size(q) <= 0;
}
int dns_question_merge(DnsQuestion *a, DnsQuestion *b, DnsQuestion **ret);
DEFINE_TRIVIAL_CLEANUP_FUNC(DnsQuestion*, dns_question_unref);
#define _DNS_QUESTION_FOREACH(u, k, q) \