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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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5
libc/dns/dns.h
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@ -1,5 +1,6 @@
#ifndef COSMOPOLITAN_LIBC_DNS_DNS_H_
#define COSMOPOLITAN_LIBC_DNS_DNS_H_
#include "libc/calls/weirdtypes.h"
#include "libc/dns/resolvconf.h"
#include "libc/sock/sock.h"
@ -56,11 +57,15 @@ struct addrinfo {
int getaddrinfo(const char *, const char *, const struct addrinfo *,
struct addrinfo **) paramsnonnull((4));
int freeaddrinfo(struct addrinfo *);
int getnameinfo(const struct sockaddr *, socklen_t, char *, socklen_t, char *,
socklen_t, int);
const char *gai_strerror(int);
int CompareDnsNames(const char *, const char *) paramsnonnull();
int PascalifyDnsName(uint8_t *, size_t, const char *) paramsnonnull();
int ResolveDns(const struct ResolvConf *, int, const char *, struct sockaddr *,
uint32_t) paramsnonnull();
int ResolveDnsReverse(const struct ResolvConf *resolvconf, int, const char *,
char *, size_t) paramsnonnull();
struct addrinfo *newaddrinfo(uint16_t);
COSMOPOLITAN_C_END_