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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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9
libc/dns/hoststxt.h
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@ -21,7 +21,12 @@ struct HostsTxtStrings {
char *p;
};
#define HOSTSTXT_NOT_SORTED 0
#define HOSTSTXT_SORTEDBYNAME 1
#define HOSTSTXT_SORTEDBYADDR 2
struct HostsTxt {
int sorted_by;
struct HostsTxtEntries entries;
struct HostsTxtStrings strings;
};
@ -29,10 +34,12 @@ struct HostsTxt {
const struct HostsTxt *GetHostsTxt(void) returnsnonnull;
void FreeHostsTxt(struct HostsTxt **) paramsnonnull();
int ParseHostsTxt(struct HostsTxt *, FILE *) paramsnonnull();
void SortHostsTxt(struct HostsTxt *) paramsnonnull();
void SortHostsTxt(struct HostsTxt *, int) paramsnonnull();
int ResolveHostsTxt(const struct HostsTxt *, int, const char *,
struct sockaddr *, uint32_t, const char **)
paramsnonnull((1, 3));
int ResolveHostsReverse(const struct HostsTxt *, int, const uint8_t *, char *,
size_t);
COSMOPOLITAN_C_END_
#endif /* !(__ASSEMBLER__ + __LINKER__ + 0) */