diff options
Diffstat (limited to 'resolv/res_send.c')
| -rw-r--r-- | resolv/res_send.c | 18 |
1 files changed, 18 insertions, 0 deletions
diff --git a/resolv/res_send.c b/resolv/res_send.c index 887d048e19..f38c399ffd 100644 --- a/resolv/res_send.c +++ b/resolv/res_send.c @@ -986,6 +986,24 @@ send_dg(res_state statp, ans, (resplen > anssiz) ? anssiz : resplen); goto wait; } +#ifdef RES_USE_EDNS0 + if (anhp->rcode == FORMERR + && (statp->options & RES_USE_EDNS0) != 0U) { + /* + * Do not retry if the server do 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"), + ans, (resplen > anssiz) ? anssiz : resplen); + /* record the error */ + statp->_flags |= RES_F_EDNS0ERR; + goto err_out; + } +#endif if (!(statp->options & RES_INSECURE2) && !res_queriesmatch(buf, buf + buflen, ans, ans + anssiz)) { |