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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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4
test/libc/dns/resolvehoststxt_test.c
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@ -49,7 +49,7 @@ TEST(ResolveHostsTxt, testBasicLookups) {
struct HostsTxt *ht = calloc(1, sizeof(struct HostsTxt));
FILE *f = fmemopen(kInput, strlen(kInput), "r+");
ASSERT_EQ(0, ParseHostsTxt(ht, f));
SortHostsTxt(ht);
SortHostsTxt(ht, HOSTSTXT_SORTEDBYNAME);
ASSERT_EQ(5, ht->entries.i);
EXPECT_STREQ("127.0.0.1", EzIp4Lookup(ht, "localhost"));
EXPECT_STREQ("203.0.113.1", EzIp4Lookup(ht, "lol"));
@ -66,7 +66,7 @@ TEST(ResolveHostsTxt, testCanonicalize) {
struct HostsTxt *ht = calloc(1, sizeof(struct HostsTxt));
FILE *f = fmemopen(kInput, strlen(kInput), "r+");
ASSERT_EQ(0, ParseHostsTxt(ht, f));
SortHostsTxt(ht);
SortHostsTxt(ht, HOSTSTXT_SORTEDBYNAME);
ASSERT_EQ(5, ht->entries.i);
EXPECT_STREQ("localhost", EzCanonicalize(ht, "localhost"));
EXPECT_STREQ("lol.example.", EzCanonicalize(ht, "lol"));