[newlib-cygwin/cygwin-3_3-branch] Cygwin: resolver: Added processing of AAAA records

[Corinna Vinschen]

https://sourceware.org/git/gitweb.cgi?p=newlib-cygwin.git;h=367b62859e06999979eead7bd849e68d3d239246

commit 367b62859e06999979eead7bd849e68d3d239246
Author: Anton Lavrentiev via Cygwin-patches <cygwin-patches@cygwin.com>
Date:   Mon Jan 17 13:03:14 2022 -0500

    Cygwin: resolver: Added processing of AAAA records
    
    AAAA records returned from Windows resolver were flagged as "No
    structure" in debug output because of being processed (although
    correctly) in the default catch-all case.  This patch makes the AAAA
    records properly recognized.

Diff:
---
 winsup/cygwin/libc/minires-os-if.c | 15 +++++++--------
 1 file changed, 7 insertions(+), 8 deletions(-)

diff --git a/winsup/cygwin/libc/minires-os-if.c b/winsup/cygwin/libc/minires-os-if.c
index 565158150..55adff22e 100644
--- a/winsup/cygwin/libc/minires-os-if.c
+++ b/winsup/cygwin/libc/minires-os-if.c
@@ -69,15 +69,14 @@ static unsigned char * write_record(unsigned char * ptr, PDNS_RECORD rr,
 
   switch(rr->wType) {
   case DNS_TYPE_A:
+  case DNS_TYPE_AAAA:
   {
-    u_int8_t * aptr = (u_int8_t *) & rr->Data.A.IpAddress;
-    if (ptr + 4 <= EndPtr) {
-      ptr[0] = aptr[0];
-      ptr[1] = aptr[1];
-      ptr[2] = aptr[2];
-      ptr[3] = aptr[3];
-    }
-    ptr += 4;
+    u_int8_t * aptr = rr->wType == DNS_TYPE_A
+      ? (u_int8_t *) & rr->Data.A.IpAddress : (u_int8_t *) & rr->Data.AAAA.Ip6Address;
+    int sz = rr->wType == DNS_TYPE_A ? NS_INADDRSZ/*4*/ : NS_IN6ADDRSZ/*16*/;
+    if (ptr + sz <= EndPtr)
+      memcpy(ptr, aptr, sz);
+    ptr += sz;
     break;
   }
   case DNS_TYPE_NS: