[gnurl] 36/222: doh: avoid truncating DNS QTYPE to lower octet

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ng0 pushed a commit to branch master
in repository gnurl.

commit 0d59addff6af9d32b7b92b61ebd74915c2ff13e8
Author: Niall O'Reilly <address@hidden>
AuthorDate: Thu Sep 19 14:38:14 2019 +0100

    doh: avoid truncating DNS QTYPE to lower octet
    
    Closes #4381
---
 lib/doh.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/lib/doh.c b/lib/doh.c
index e97e4fe7a..5a76d6d87 100644
--- a/lib/doh.c
+++ b/lib/doh.c
@@ -135,8 +135,10 @@ UNITTEST DOHcode doh_encode(const char *host,
     }
   } while(1);
 
-  *dnsp++ = '\0'; /* upper 8 bit TYPE */
-  *dnsp++ = (unsigned char)dnstype;
+  /* There are assigned TYPE codes beyond 255: use range [1..65535]  */
+  *dnsp++ = (unsigned char)(255 & (dnstype>>8)); /* upper 8 bit TYPE */
+  *dnsp++ = (unsigned char)(255 & dnstype);      /* lower 8 bit TYPE */
+
   *dnsp++ = '\0'; /* upper 8 bit CLASS */
   *dnsp++ = DNS_CLASS_IN; /* IN - "the Internet" */
 

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