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doh: avoid truncating DNS QTYPE to lower octet

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Closes #4381
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Niall O'Reilly 2019-09-19 14:38:14 +01:00 • committed by Daniel Stenberg
parent 0a4ecbdf1c
commit 0d59addff6
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1 changed files with 4 additions and 2 deletions
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6
lib/doh.c
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@ -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" */