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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
libc/dns/consts.h
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@ -3,7 +3,9 @@
#include "libc/sock/sock.h"
#if !(__ASSEMBLER__ + __LINKER__ + 0)
#define DNS_TYPE_A 1
#define DNS_TYPE_A 0x01
#define DNS_TYPE_PTR 0x0c
#define DNS_CLASS_IN 1
#define kMinSockaddr4Size \