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Added getnameinfo with only name lookup (#172)

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Added necessary constants (DNS_TYPE_PTR, NI_NUMERICHOST etc.).
Implementation of getnameinfo is similar to getaddrinfo, with internal
functions:

* ResolveDnsReverse: performs rDNS query and parses the PTR record
* ResolveHostsReverse: reads /etc/hosts to map hostname to
  address

Earlier, the HOSTS.txt would only need to be sorted at loading time,
because the only kind of lookup was name -> address. Now since address
-> name lookups are also possible, so the HostsTxt struct, the sorting
method (and the related tests) was changed to reflect this.
This commit is contained in:
Gautham 2021-06-10 08:05:44 +05:30 • committed by GitHub
parent 05350eca60
commit 248c6d54bb
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12 changed files with 334 additions and 10 deletions
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test/libc/dns/parsehoststxt_test.c
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@ -48,7 +48,7 @@ TEST(ParseHostsTxt, testCorrectlyTokenizesAndSorts) {
ASSERT_EQ(1, fwrite(kInput, strlen(kInput), 1, f));
rewind(f);
ASSERT_EQ(0, ParseHostsTxt(ht, f));
SortHostsTxt(ht);
SortHostsTxt(ht, HOSTSTXT_SORTEDBYNAME);
ASSERT_EQ(4, ht->entries.i);
EXPECT_STREQ("cat.example.", &ht->strings.p[ht->entries.p[0].name]);
EXPECT_STREQ("cat.example.", &ht->strings.p[ht->entries.p[0].canon]);