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| author | Florian Weimer <fweimer@redhat.com> | 2019-10-30 17:26:58 +0100 |
|---|---|---|
| committer | Florian Weimer <fweimer@redhat.com> | 2019-11-27 20:54:37 +0100 |
| commit | 446997ff1433d33452b81dfa9e626b8dccf101a4 (patch) | |
| tree | 9a0e13fb7ca042a6f05fa9310f862c494580da80 /support | |
| parent | 4a2ab5843a5cc4a5db1b3b79916a520ea8b115dc (diff) | |
| download | glibc-446997ff1433d33452b81dfa9e626b8dccf101a4.tar.gz glibc-446997ff1433d33452b81dfa9e626b8dccf101a4.tar.xz glibc-446997ff1433d33452b81dfa9e626b8dccf101a4.zip | |
resolv: Implement trust-ad option for /etc/resolv.conf [BZ #20358]
This introduces a concept of trusted name servers, for which the AD bit is passed through to applications. For untrusted name servers (the default), the AD bit in responses are cleared, to provide a safe default. This approach is very similar to the one suggested by Pavel Šimerda in <https://bugzilla.redhat.com/show_bug.cgi?id=1164339#c15>. The DNS test framework in support/ is enhanced with support for setting the AD bit in responses. Tested on x86_64-linux-gnu. Change-Id: Ibfe0f7c73ea221c35979842c5c3b6ed486495ccc
Diffstat (limited to 'support')
| -rw-r--r-- | support/resolv_test.c | 2 | ||||
| -rw-r--r-- | support/resolv_test.h | 3 |
2 files changed, 5 insertions, 0 deletions
diff --git a/support/resolv_test.c b/support/resolv_test.c index aeca519ee3..b1c745dc8c 100644 --- a/support/resolv_test.c +++ b/support/resolv_test.c @@ -182,6 +182,8 @@ resolv_response_init (struct resolv_response_builder *b, if (flags.tc) b->buffer[2] |= 0x02; b->buffer[3] = 0x80 | flags.rcode; /* Always set RA. */ + if (flags.ad) + b->buffer[3] |= 0x20; /* Fill in the initial section count values. */ b->buffer[4] = flags.qdcount >> 8; diff --git a/support/resolv_test.h b/support/resolv_test.h index e36e3e3ae0..02a11bd712 100644 --- a/support/resolv_test.h +++ b/support/resolv_test.h @@ -134,6 +134,9 @@ struct resolv_response_flags /* If true, the TC (truncation) flag will be set. */ bool tc; + /* If true, the AD (authenticated data) flag will be set. */ + bool ad; + /* Initial section count values. Can be used to artificially increase the counts, for malformed packet testing.*/ unsigned short qdcount; |