diff options
Diffstat (limited to 'resolv/res_send.c')
| -rw-r--r-- | resolv/res_send.c | 21 |
1 files changed, 21 insertions, 0 deletions
diff --git a/resolv/res_send.c b/resolv/res_send.c index 47bfba6..fce8100 100644 --- a/resolv/res_send.c +++ b/resolv/res_send.c @@ -332,6 +332,15 @@ nameserver_offset (struct __res_state *statp) } } +/* Clear the AD bit unless the trust-ad option was specified in the + resolver configuration. */ +static void +mask_ad_bit (struct resolv_context *ctx, void *buf) +{ + if (!(ctx->resp->options & RES_TRUSTAD)) + ((HEADER *) buf)->ad = 0; +} + /* int * res_queriesmatch(buf1, eom1, buf2, eom2) * is there a 1:1 mapping of (name,type,class) @@ -525,6 +534,18 @@ __res_context_send (struct resolv_context *ctx, resplen = n; + /* Mask the AD bit in both responses unless it is + marked trusted. */ + if (resplen > HFIXEDSZ) + { + if (ansp != NULL) + mask_ad_bit (ctx, *ansp); + else + mask_ad_bit (ctx, ans); + } + if (resplen2 != NULL && *resplen2 > HFIXEDSZ) + mask_ad_bit (ctx, *ansp2); + /* * If we have temporarily opened a virtual circuit, * or if we haven't been asked to keep a socket open, |