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e860ecce82
Since nginx always uses exactly one entry in the question section of a DNS query, and never uses compression pointers in this entry, parsing of a DNS response in ngx_resolver_process_response() does not expect compression pointers to appear in the question section of the DNS response. Indeed, compression pointers in the first name of a DNS response hardly make sense, do not seem to be allowed by RFC 1035 (which says "a pointer to a prior occurance of the same name", note "prior"), and were never observed in practice. Added an explicit check to ngx_resolver_process_response()'s parsing of the question section to properly report an error if compression pointers nevertheless appear in the question section. |
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