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DNS name compression does not depend on the EDNS version

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There was a proposal in the late 1990s that it might, but it turned
out to be unworkable. See RFC 6891, Extension Mechanisms for
DNS (EDNS(0)), section 5, Extended Label Types.

The remnants of the code that supported this in BIND are redundant.
This commit is contained in:
Tony Finch
2022-05-04 17:35:39 +01:00
parent dded5a2612
commit e37b782c1a
24 changed files with 53 additions and 121 deletions
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21
doc/dev/rdata.md
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@@ -208,13 +208,11 @@ security area and must be paranoid about its input.
bool downcase,
isc_buffer_t *target);
`fromwire_classname_typename()` is required to set the valid
decompression methods if there is a domain name in the rdata.
`fromwire_classname_typename()` is required to set whether
name compression is allowed, according to RFC 3597.
if (dns_decompress_edns(dctx) >= # || !dns_decompress_strict(dctx))
dns_decompress_setmethods(dctx, DNS_COMPRESS_ALL);
else
dns_decompress_setmethods(dctx, DNS_COMPRESS_GLOBAL14);
dns_decompress_setmethods(dctx, DNS_COMPRESS_GLOBAL14);
/* or DNS_COMPRESS_NONE */
|Parameter|Description |
|---------|-----------------------|
@@ -245,14 +243,11 @@ will return `DNS_R_EXTRADATA`.
dns_compress_t *cctx,
isc_buffer_t *target);
`towire_classname_typename()` is required to set the
allowed name compression methods based on the EDNS version, if there
is a domain name in the rdata.
`towire_classname_typename()` is required to set whether
name compression is allowed, according to RFC 3597.
if (dns_compress_getedns(cctx) >= #)
dns_compress_setmethods(cctx, DNS_COMPRESS_ALL);
else
dns_compress_setmethods(cctx, DNS_COMPRESS_GLOBAL14);
dns_compress_setmethods(cctx, DNS_COMPRESS_GLOBAL14);
/* or DNS_COMPRESS_NONE */
|Parameter|Description |
|---------|-----------------------|