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doh: allow only http and https in debug mode

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Otherwise curl may be told to use for instance pop3 to
communicate with the doh server, which most likely
is not what you want.

Found through fuzzing.

Closes #4406
This commit is contained in:
Paul Dreik 2019-09-23 13:11:49 +02:00 committed by Daniel Stenberg
parent bb74201804
commit a5bf6a36c5
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1 changed files with 3 additions and 0 deletions
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3
lib/doh.c
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@ -264,6 +264,9 @@ static CURLcode dohprobe(struct Curl_easy *data,
#ifndef CURLDEBUG
/* enforce HTTPS if not debug */
ERROR_CHECK_SETOPT(CURLOPT_PROTOCOLS, CURLPROTO_HTTPS);
#else
/* in debug mode, also allow http */
ERROR_CHECK_SETOPT(CURLOPT_PROTOCOLS, CURLPROTO_HTTP|CURLPROTO_HTTPS);
#endif
ERROR_CHECK_SETOPT(CURLOPT_TIMEOUT_MS, (long)timeout_ms);
if(data->set.verbose)