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| author | Florian Weimer <fweimer@redhat.com> | 2017-04-13 13:22:51 +0200 |
|---|---|---|
| committer | Florian Weimer <fweimer@redhat.com> | 2017-04-13 13:22:51 +0200 |
| commit | 44500cbb25bc6e76723304b9ff39f875c04309f9 (patch) | |
| tree | 924aa24c754a523da4c0f381f9f269ddc5c327c9 /resolv/res_send.c | |
| parent | e14a27723cc3a154d67f3f26e719d08c0ba9ad25 (diff) | |
| download | glibc-44500cbb25bc6e76723304b9ff39f875c04309f9.tar.gz glibc-44500cbb25bc6e76723304b9ff39f875c04309f9.tar.xz glibc-44500cbb25bc6e76723304b9ff39f875c04309f9.zip | |
resolv: Remove EDNS fallback [BZ #21369]
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.
Diffstat (limited to 'resolv/res_send.c')
| -rw-r--r-- | resolv/res_send.c | 20 |
1 files changed, 0 insertions, 20 deletions
diff --git a/resolv/res_send.c b/resolv/res_send.c index 995e1be730..ffb9a6af7b 100644 --- a/resolv/res_send.c +++ b/resolv/res_send.c @@ -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, |