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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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3
libc/dns/gethoststxt.c
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@ -61,6 +61,7 @@ const struct HostsTxt *GetHostsTxt(void) {
init = &g_hoststxt_init;
if (!g_hoststxt) {
g_hoststxt = &init->ht;
init->ht.sorted_by = HOSTSTXT_NOT_SORTED;
init->ht.entries.n = pushpop(ARRAYLEN(init->entries));
init->ht.entries.p = init->entries;
init->ht.strings.n = pushpop(ARRAYLEN(init->strings));
@ -74,7 +75,7 @@ const struct HostsTxt *GetHostsTxt(void) {
/* TODO(jart): Elevate robustness. */
}
fclose(f);
SortHostsTxt(g_hoststxt);
SortHostsTxt(g_hoststxt, HOSTSTXT_SORTEDBYNAME);
}
return g_hoststxt;
}