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resolv: Remove EDNS fallback [BZ #21369]

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EDNS is disabled by default (so there is interoperability issue), and
the fallback code is problematic because it prevents an application
from obtaining DNSSEC data after a FORMERR response.
This commit is contained in:
Florian Weimer
2017-04-13 13:22:51 +02:00
parent e14a27723c
commit 44500cbb25
5 changed files with 75 additions and 62 deletions
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20
resolv/res_send.c
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@@ -1321,26 +1321,6 @@ send_dg(res_state statp,
? *thisanssizp : *thisresplenp);
goto wait;
}
#ifdef RES_USE_EDNS0
if (anhp->rcode == FORMERR
&& (statp->options & RES_USE_EDNS0) != 0U) {
/*
* Do not retry if the server does not understand
* EDNS0. The case has to be captured here, as
* FORMERR packet do not carry query section, hence
* res_queriesmatch() returns 0.
*/
DprintQ(statp->options & RES_DEBUG,
(stdout,
"server rejected query with EDNS0:\n"),
*thisansp,
(*thisresplenp > *thisanssizp)
? *thisanssizp : *thisresplenp);
/* record the error */
statp->_flags |= RES_F_EDNS0ERR;
return close_and_return_error (statp, resplen2);
}
#endif
if (!(statp->options & RES_INSECURE2)
&& (recvresp1 || !res_queriesmatch(buf, buf + buflen,
*thisansp,