Maintaining compatibility with pre-2.0.0 dnspython became cumbersome
leading to failure in nightly CI jobs which are the only ones that run
with dnspython this old.
Abort all AsyncServer instances when running with old dnspython. Add an
importor skip for all system tests using isctest.asyncserver.
They can be used outside of test modules (like ans.py custom servers)
which leads to pytest.outcomes.Skipped being raised in weird places and
skipping of tests which don't need dnspython this new.
Remove pytest.importskip from top scope in isctest.name, only run the
check when ZoneAnalyzer is used.
`named-checkconf` now supports the command line switch `-b`, which
prints the default built-in configuration used by `named`.
When `-b` is in use, other options are ignored.
Check that dig doesn't exit with an assertion failure when a IPv4
source address is defined after defining a server address which has
both IPv4 and IPv6 addresses (in this case, @localhost).
Previously, if there's no more server to try in force_next,
it attempted to retry the current server similar to a query
timeout case. But, force_next() is called only when the
current server's address is unusable and the query was not
even sent, so recvcount was not incremented, causing an
assertion failure.
We might be able to fix it so the retry doesn't cause a crash,
but it doesn't make sense to retry the server when its address
is known to be unusable. So, simply avoiding the retry would be
the easiest and safest way to prevent the crash.
Without this, start_udp or start_tcp would trigger an assertion
failure. Detaching it at this point is also consistent with
other failure handling cases, such as in recv_done.
Add system test covering EDE 24 being added in the response in both
common cases: when the server has not loaded the DB of a zone and when
the zone has expired (secondary).
The built-in configuration is actually used in two cases: first, when
the server is loaded (or reloaded), and second when
'rndc showconf -builtin' is called.
Considering the parsing of the builtin configuration is quick and does
not occur during exclusive mode, but the configuration tree takes
considerable memory space, the built-in configuration is no longer kept
in memory once it has been used; instead it is re-parsed on demand.
once the user configuration has been merged into the effective
configuration, it no longer needs to be accessed as a configuration
tree, but we still want to be able to show it with 'rndc showconf -user'.
because the recursive strucure of cfg_obj objects is fairly large, the
canonical text form is a fraction of the size of the configuration
tree, so we now save it in that form instead.
Add system tests covering the rndc showconf command. It doesn't
attempt to check the whole effective configuration (as any change to the
builtin configuration would break it) but instead ensures that some parts
of the user config are present, as well as some parts of the builtin
config as well.
It also checks that the effective config (in this context of running
named instance) is about static configuration: a newly added zone is not
visible in the effective configuration.
add a new rndc command to dump server configuration info:
- "rndc showconf -user" dumps the contents of named.conf
- "rndc showconf -builtin" dumps named_g_defaltconfig
- "rndc showconf -effective" dumps the effective configuration,
i.e., the merger of the builtin and the user configurations.
instead of using an opaque ns_cfgctx pointer to store the configuration
data to be used by addzone and modzone, there are now fields in the
dns_view object to store the view configuration and LMDB database
environment. the global configuration is now stored in the named_server
object, along with the ACL context.
Add a system test checking the command line switch -e of
named-checkconf. The test doesn't care about the whole output of the
effective configuration (in particular to avoid breaking the test for
each default statement that would change) but instead just ensure the
effective configuration is actually returned by checking the presence of
the _bind chaos builtin view as well a user provided view and option
change.
New command line switch `-e` introduced to `named-checkconf`. It acts
like `-p` but instead it print the effective configuration rather than
the user configuration.
Since the builtin trust-anchors are now called `builtin-trust-anchors`,
delv needs specific handling in order to be able to parse those when
they are used.
Before, delv was simply parsing a single clause (either in the case of
an overriden trust-anchors value from bindkeys file or by simply reading
the builtin value). But since the name changed, the same code can't be
shared and the builtin version is expected to be in a map.
instead of parsing the default configuration to extract the
geoip-directory value, we can just construct the value the same way
it's done for the defaults.
Since the effective configuration tree is a "merged" configuration tree
from the user and the default configurations, the effective configuration
provides a unique configuration tree used by apply_confiuration() to
configure the server.
However, there is one specific case where the configuration code needs
to differentiate whether the configuration originally came from the
default or the user configuration: the trust-anchors. This is because
the default trust-anchors _have_ to be those for the root zone, and the
one provided by the user can be for any zone. A check enforces this.
In order to keep this difference visible from the configuration code,
with a unique configuration tree, we now introduce a default-only
`builtin-trust-anchors` statement which holds the builtin root
trust-anchors. It can't be used from the user configuration (this would
raise an error), hence it is not documented.
The effective configuration now contains the actual named configuration
as a unified user/global single tree instance. We now provide this to
apply_configuration() instead of the user configuration.
The serve-stale system test relies on sed accessing the source
file that hard-codes the default configuration. Since it moved from
bin/named/config.c into bin/include/defaultconfig.h, the test needs
the path updated.
The prefetch statement can be overriden by the user, but the user might
specify the prefetch without the trigger value, which needs to be
pulled from the default configuration. Handle this case by directly
getting the default value if needed from the default configuration when
building the effective configuration tree.
Also take care of keeping the values inside their bounds, and simplify
the server configuration code which then just have to read effective
configuration values.
Default dnssec-policies are not overridden by user-provided ones. Add
this specific case to make sure those are kept, and also ensure that the
default dnssec-policy is always in the first position (which is an
implicit requirement in the existing implementation).
Also simplify the server configuration code, as it only needs to build
the list of dnssec-policy based on the effective config list.
User specified views don't override default views. In particular, the
_bind/CH view is still active. However, the order is important: if the
user defines a foo/CH view, it must be able to override _bind/CH by
matching clients first (this is how the view is documented).
The server configuration code is now simpler; it only has to build the
views based on the effective view list, and only creates the _default
view if there are no explicit views created by the user.
Implement the specific rules of ACL inheritance when buiding the
effective configuration. As those rules are directly implemented in the
configuration tree, they are removed from `apply_configuation`.
Two programs need to be able to provide the effective configuration:
named (through a future rndc command) and named-checkconf (though a
future command line switch). In order to calculate the effective
configuration from named-checkconf, the default configuration
needs to be accessible.
The default configuration has now been moved from bin/named/config.c
into a common include directory for binaries: bin/include/defaultconfig.h.
Add a default "response-padding" option in the global defaults,
to disable the option, and simplify the configuration code so that
looks at the global defaults if the option is not set in named.conf.
This enables us to remove the 'optionmaps' variable in configure_view(),
which was used for options that only look in named.conf.
In the past, "dnssec-validation" was not looked up in the global
defaults unless "dnssec-enable" was true. "dnssec-enable" has been
obsolete for several years, but dnssec-validation was still being
configured in two steps. This commit removes the vestigial bits of
the old logic.
"max-cache-size default;" is allowed, according to the documentation
and the parser, but when it's configured, named crashes due to an
INSIST that the only legal string value is "unlimited". this has
been fied.
the configuration has also been simplified. previously, we checked for
max-cache-size in view and options, then determined whether to look in
the global default options based on whether the view had recursion set.
the default value set there was only applicable to views with recursion.
now, the default is an explicit "default", which affects views with
and without recursion in different ways.
the cfg type for "max-cache-size" has been changed from
cfg_type_sizeorpercent to cfg_type_maxcachesize.
Reimplement the custom server using the asyncserver Python module.
Behavior change: The new server doesn't copy CD and DO flags and a
client cookie to responses.
Add a new ResponseHandler subclass, QnameHandler, which enables
conveniently matching specific QNAMEs (without also matching their
subdomains like DomainHandler does).
This is mostly for cases where no zone is set up and all response stubs
come to response handler with REFUSED as RCODE.
This commit allows to override the RCODE before QueryContext is passed
to response handlers.
Replace the custom DNS servers in the "cookie" system test with new code
based on the isctest.asyncserver module. The convoluted test logic is
split into multiple response handlers which are shared between the two
servers.
Behavior change: returned SOA records have the zone name set properly.
Replace the custom server with new implementation using the
AsyncDnsServer class.
Behavior changes:
- DNS cookie is not copied to the responses.
- CD, DO flags aren't set on responses.
Reimplement the custom server using isctest.asyncserver. Factor most of
the logic out of the server code to two (identical) zones and only
implement the non-standard behavior.
Behavior changes:
- RRSIG Expiration and Inception is now static and covering the whole
timeline instead of being calculated everytime.
- NXDOMAIN is returned where suitable by standard.
- Returned SOA records have properly set zone names.
The variables example2com, example3com, and example4com where not
being initalised on all paths leading to Coverity issues ID 637690,
ID 637691 and ID 637692 being raised. In addition the tests to free
them were wrong as they depended on the unintialised variables. This
has been fixed.
Passing the JSON_C_TO_STRING_PRETTY flag to
json_object_to_json_string_ext() makes the latter produce prettified
JSON output. This results in a huge amount of redundant whitespace
being inserted into each HTTP response (whitespace amounts to about 40%
of the entire JSON payload).
The bandwidth cost can be amortized by enabling HTTP compression on the
client side ("Accept-Encoding: deflate"), but that does not affect the
size of data at rest.
Use the JSON_C_TO_STRING_PLAIN flag instead of JSON_C_TO_STRING_PRETTY
to minimize the size of JSON responses sent via the statistics channel.
External tools should be used for prettifying JSON data.
The traffic-json.pl and traffic-xml.pl scripts that were used in the
"statschannel" system test in the past became dead code when commit
1202fd912a rewrote parts of that test to
Python. Remove those scripts.
Inspecting XML data using sed and grep is error-prone, overly lax in
some ways, overly strict in others, and neither accurate nor expressive.
Use xmllint and XPath expressions for inspecting XML data in the
"statistics", "statschannel", and "synthfromdnssec" system tests to
address these deficiencies.
Detect whether and where the xmllint utility is available at build time,
so that it can be used in system tests. If the tool is not found,
specific checks employing it will be skipped.
Inspecting JSON data using grep is error-prone, overly lax in some ways,
overly strict in others, and neither accurate nor expressive. Use jq
for inspecting JSON data in the "statschannel" and "synthfromdnssec"
system tests to address these deficiencies.
Detect whether and where the jq utility is available at build time, so
that it can be used in system tests. If the tool is not found, specific
checks employing it will be skipped.
change_directory() now lives in libisccfg. when it was moved,
the logging behavior changed: previously it had been logged
by named only, in the general logging category, and without the
named.conf filename and line number. it was not logged by
named-checkconf. this behavior has now been restored.
Since the zone now has a reference to their respective configuration
tree, `rndc showzone` can be used for any zones (including those
defined in namedconf), without `allow-new-zones` being enabled.
Add a test for this.
The test is part of the addzone suite because showzone used to be
related to addzone, but this could be moved elsewhere in the future
if more specific tests are needed for showzone.
Since the `file` property of cfg_obj_t can now be null (instead of
"none"), cfg_obj_t would take a fallback flow where the line was not
logged. This fixes it.
Also, add the log line when parser_complain is called and `file` is null
(which might happend when parsing buffer only) to also include the line
number.
- several functions that can no longer fail have been changed to
type void, and unnecessary 'cleanup' sections were removed
- renamed cfg_create_obj() to cfg_obj_create(), and cfg_create_tuple()
to cfg_tuple_create(), to match typical nomenclature.
- fixed a memory leak bug, in which an element could be removed
from a list in delete_zoneconf() without being freed. this has
been addressed by adding a cfg_list_unlink() function.
list elements are now allocated based on the list they will
be stored in, using the same mctx.
- the cfg_parser_create() and cfg_parser_destroy() calls are no
longer used outside parser.c, so they are now static functions
- cfg_parser_attach(), cfg_parser_reset(), and cfg_parser_setflags()
are no longer used at all, and have been removed.
- cfg_parser_mapadd() has been renamed for clarity to cfg_map_add().
Instead of (1) allocating a parser, (2) parsing a file/buffer then (3)
freeing the parser, the parser is now internally created/destroyed from
within the `cfg_parse_*` functions. This simplifies a lot the use cases,
especially around the error cases where the parser needs to be freed in
a cleanup goto.
The only trick was the parser callback mechanism, which would previously
have been set up between steps 1 and 2. Since it's never been used for
any purpose other than the "directory" option, the chdir call has now
been moved inside the parser and the generic callback mechanism has been
removed, replacing CFG_CLAUSEFLAG_CALLBACK with CFG_CLAUSEFLAG_CHDIR.
when configuring a zone, we can now save the zone's configuration
object in the zone itself by calling dns_zone_setcfg(). this can
then be used by "rndc showzone" to print the zone's configuration,
which is simpler than searching for it using the new-zones
configuration, and allows it to work even if "allow-new-zones"
is disabled.
