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add support for reverse name lookups from hosts file to getnameinfo

Browse Source 
this also affects the legacy gethostbyaddr family, which uses
getnameinfo as its backend.

some other minor changes associated with the refactoring of source
files are also made; in particular, the resolv.conf parser now uses
the same code that's used elsewhere to handle ip literals, so as a
side effect it can now accept a scope id for nameserver addressed with
link-local scope.
This commit is contained in:
Rich Felker
2014-06-04 16:53:39 -04:00
parent 934aa1350b
commit 01dc3f4fea
5 changed files with 122 additions and 50 deletions
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21
src/network/res_msend.c
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@@ -12,6 +12,7 @@
#include <pthread.h>
#include "stdio_impl.h"
#include "syscall.h"
#include "lookup.h"
static void cleanup(void *p)
{
@@ -47,6 +48,7 @@ int __res_msend(int nqueries, const unsigned char *const *queries,
int cs;
struct pollfd pfd;
unsigned long t0, t1, t2;
struct address iplit;
pthread_setcancelstate(PTHREAD_CANCEL_DISABLE, &cs);
@@ -76,13 +78,18 @@ int __res_msend(int nqueries, const unsigned char *const *queries,
for (z=s; *z && !isspace(*z); z++);
*z=0;
if (inet_pton(AF_INET, s, &ns[nns].sin.sin_addr)>0) {
ns[nns].sin.sin_port = htons(53);
ns[nns++].sin.sin_family = AF_INET;
} else if (inet_pton(AF_INET6, s, &ns[nns].sin6.sin6_addr)>0) {
sl = sizeof sa.sin6;
ns[nns].sin6.sin6_port = htons(53);
ns[nns++].sin6.sin6_family = family = AF_INET6;
if (__lookup_ipliteral(&iplit, s, AF_UNSPEC)>0) {
if (iplit.family == AF_INET) {
memcpy(&ns[nns].sin.sin_addr, iplit.addr, 4);
ns[nns].sin.sin_port = htons(53);
ns[nns++].sin.sin_family = AF_INET;
} else {
sl = sizeof sa.sin6;
memcpy(&ns[nns].sin6.sin6_addr, iplit.addr, 16);
ns[nns].sin6.sin6_port = htons(53);
ns[nns].sin6.sin6_scope_id = iplit.scopeid;
ns[nns++].sin6.sin6_family = family = AF_INET6;
}
}
}
if (f) __fclose_ca(f);