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Most servers apparently always implicitly convert DNAME to CNAME, but
some servers don't, hence implement this properly, as this is required
by edns0.
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RFC 6763 is very clear that TXT RRs should allow arbitrary binary
content, hence let's actually accept that. This also means accepting NUL
bytes in the middle of strings.
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string-util.[ch]
There are more than enough calls doing string manipulations to deserve
its own files, hence do something about it.
This patch also sorts the #include blocks of all files that needed to be
updated, according to the sorting suggestions from CODING_STYLE. Since
pretty much every file needs our string manipulation functions this
effectively means that most files have sorted #include blocks now.
Also touches a few unrelated include files.
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All our hash functions are based on siphash24(), factor out
siphash_init() and siphash24_finalize() and pass the siphash
state to the hash functions rather than the hash key.
This simplifies the hash functions, and in particular makes
composition simpler as calling siphash24_compress() repeatedly
on separate chunks of input has the same effect as first
concatenating the input and then calling siphash23_compress()
on the result.
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Takes a key and CNAME RR and returns the canonical RR of the right
type. Make use of this in dns_question_redirect().
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Creates a new CNAME RR key with the same class and name as an existing key.
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With this change we'll now also generate synthesized RRs for the local
LLMNR hostname (first label of system hostname), the local mDNS hostname
(first label of system hostname suffixed with .local), the "gateway"
hostname and all the reverse PTRs. This hence takes over part of what
nss-myhostname already implemented.
Local hostnames resolve to the set of local IP addresses. Since the
addresses are possibly on different interfaces it is necessary to change
the internal DnsAnswer object to track per-RR interface indexes, and to
change the bus API to always return the interface per-address rather than
per-reply. This change also patches the existing clients for resolved
accordingly (nss-resolve + systemd-resolve-host).
This also changes the routing logic for queries slightly: we now ensure
that the local hostname is never resolved via LLMNR, thus making it
trustable on the local system.
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Assigning a TPYE enum value to a class variable is certainly wrong.
However, they both have the same value, so the result was correct
nevertheless.
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Rename the field to make this clearer.
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resolve: unify memdup() code when parsing RRs
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Let's make dns_packet_read_public_key() more generic by renaming it to
dns_packet_read_memdup() (which more accurately describes what it
does...). Then, patch all cases where we memdup() RR data to use this
new call.
This specifically checks for zero-length objects, and handles them
gracefully. It will set zero length payload fields as a result.
Special care should be taken to ensure that any code using this call
can handle the returned allocated field to be NULL if the size is
specified as 0!
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strv_extend() already strdup()s internally, no need to to this twice.
(Also, was missing OOM check...).
Use strv_consume() when we already have a string allocated whose
ownership we want to pass to the strv.
This fixes 50f1e641a93cacfc693b0c3d300bee5df0c8c460.
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Reuse the Iterator object from hashmap.h and expose a similar API.
This allows us to do
{
Iterator i;
unsigned n;
BITMAP_FOREACH(n, b, i) {
Iterator j;
unsigned m;
BITMAP_FOREACH(m, b, j) {
...
}
}
}
without getting confused. Requested by David.
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Needed for DNSSEC.
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Needed for DNSSEC.
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This implements the recommendations from RFC3597.
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Needed for DNSSEC.
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As mandated by RFC4034.
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A strv might be NULL if it is empty. The txt.strings comparison doesn't
take that into account. Introduce strv_equal() to provide a proper helper
for this and fix resolve to use it.
Thanks to Stanisław Pitucha <viraptor@gmail.com> for reporting this!
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It is redundant to store 'hash' and 'compare' function pointers in
struct Hashmap separately. The functions always comprise a pair.
Store a single pointer to struct hash_ops instead.
systemd keeps hundreds of hashmaps, so this saves a little bit of
memory.
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a->rrsig.type_covered != a->rrsig.type_covered" is always false
regardless of the values of its operands because those operands are identical.
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We are unlikely to evert support most of them, but we can at least
display the types properly.
The list is taken from the IANA list.
The table of number->name mappings is converted to a switch
statement. gcc does a nice job of optimizing lookup (when optimization
is enabled).
systemd-resolve-host -t is now case insensitive.
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LOC records have a version field. So far only version 0 has been
published, but if a record with a different version was encountered,
our only recourse is to treat it as an unknown type. This is
implemented with the 'unparseable' flag, which causes the
serialization/deserialization and printing function to cause the
record as a blob. The flag can be used if other packet types cannot be
parsed for whatever reason.
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negative caching
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Name defending is still missing.
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different clients
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Let's turn resolved into a something truly useful: a fully asynchronous
DNS stub resolver that subscribes to network changes.
(More to come: caching, LLMNR, mDNS/DNS-SD, DNSSEC, IDN, NSS module)
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