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2015-12-10resolved: discard any reply packet that contains a bogus nameDaniel Mack
Only .in-addr.arpa and .local are considered local in mDNS, so discard the packet if anything else is thrown at us.
2015-12-10Merge pull request #2056 from evverx/expose-soft-limits-on-the-busLennart Poettering
Expose soft limits on the bus
2015-12-10resolved: add more linked packets for overlong known answersDaniel Mack
For mDNS, if we're unable to stuff all known answers into the given packet, allocate a new one, push the RR into that one and link it to the current one.
2015-12-10resolved: handle linked packet in dns_scope_emit()Daniel Mack
In dns_scope_emit(), walk the list of additional packets and emit all of them. Set the TC bit in all but the last of them. This is specific to mDNS, so an assertion is triggered if used with other protocols.
2015-12-10resolved: add support for linked packetsDaniel Mack
For mDNS, we need to support the TC bit in case the list of known answers exceed the maximum packet size. For this, add a 'more' pointer to DnsPacket for an additional packet. When a packet is unref'ed, the ->more packet is also unrefed, so it sufficient to only keep track of the 1st packet in a chain.
2015-12-10resolved: add dns_packet_set_flags()Daniel Mack
We need to support the TC bit in queries in case known answers exceed the maximum packet size. Factor out the flags compilation to dns_packet_set_flags() and make it externally available.
2015-12-09resolved: llmnr, mdns: simplify error handlingDaniel Mack
sd_event_add_io() returns the error directly and does not mess with errno.
2015-12-09resolved: don't send .local requests to DNS serversDaniel Mack
DNS names ending with .local are specific to mDNS, so don't use them on DNS scopes.
2015-12-09Merge pull request #2110 from keszybz/udev-indentationDaniel Mack
Udev indentation
2015-12-08Merge pull request #2115 from dvdhrm/rbtreeTom Gundersen
basic: add RB-Tree implementation
2015-12-08resolved: add dns_cache_export_to_packet()Daniel Mack
This new functions exports cached records of type PTR, SRV and TXT into an existing DnsPacket. This is used in order to fill in known records to mDNS queries, for known answer supression.
2015-12-08resolved: implement query coalescingDaniel Mack
Implement dns_transaction_make_packet_mdns(), a special version of dns_transaction_make_packet() for mDNS which differs in many ways: a) We coalesce queries of currently active transaction on the scope. This is possible because mDNS actually allows many questions in a to be sent in a single packet and it takes some burden from the network. b) Both A and AAAA query keys are broadcast on both IPv4 and IPv6 scopes, because other hosts might only respond on one of their addresses but resolve both types. c) We discard previously sent packages (t->sent) so we can start over and coalesce pending transactions again.
2015-12-08resolved: add 'next_attempt_after' field to DnsTransactionDaniel Mack
For each transaction, record when the earliest point in time when the query packet may hit the wire. This is the same time stamp for which the timer is scheduled in retries, except for the initial query packets which are delayed by a random jitter. In this case, we denote that the packet may actually be sent at the nominal time, without the jitter. Transactions that share the same timestamp will also have identical values in this field. It is used to coalesce pending queries in a later patch.
2015-12-08resolved: split dns_transaction_go()Daniel Mack
Split some code out of dns_transaction_go() so we can re-use it later from different context. The new function dns_transaction_prepare_next_attempt() takes care of preparing everything so that a new packet can conditionally be formulated for a transaction. This patch shouldn't cause any functional change.
2015-12-08resolved: handle more mDNS protocol detailsDaniel Mack
2015-12-08resolved: fix debug messageDaniel Mack
2015-12-08resolved: add mDNS packet dispatcherDaniel Mack
Add the packet dispatching routine for mDNS. It differs to what LLMNR and DNS dispatchers do in the way it matches incoming packets. In mDNS, we actually handle all incoming packets, regardless whether we asked for them earlier or not.
2015-12-08resolved: allow name compression in NSEC recordsDaniel Mack
2015-12-08resolved: handle mDNS timeouts per transactionDaniel Mack
mDNS packet timeouts need to be handled per transaction, not per link. Re-use the n_attempts field for this purpose, as packets timeouts should be determined by starting at 1 second, and doubling the value on each try.
2015-12-08resolved: short-cut jitter callbacks for LLMNR and mDNSDaniel Mack
When a jitter callback is issued instead of sending a DNS packet directly, on_transaction_timeout() is invoked to 'retry' the transaction. However, this function has side effects. For once, it increases the packet loss counter on the scope, and it also unrefs/refs the server instances. Fix this by tracking the jitter with two bool variables. One saying that the initial jitter has been scheduled in the first place, and one that tells us the delay packet has been sent.
2015-12-08resolved: flush keys when DNS_RESOURCE_KEY_CACHE_FLUSH is setDaniel Mack
In mDNS, DNS_RESOURCE_KEY_CACHE_FLUSH denotes whether other records with the same key should be flushed from the cache.
2015-12-08resolved: add cache flush flag to DnsResourceKeyDaniel Mack
MDNS has a 'key cache flush' flag for records which must be masked out for the parsers to do our right thing. We will also use that flag later (in a different patch) in order to alter the cache behavior.
2015-12-08resolved: add mDNS initial jitterDaniel Mack
The logic is to kick off mDNS packets in a delayed way is mostly identical to what LLMNR needs, except that the constants are different.
2015-12-08resolved: create dns scopes for mDNSDaniel Mack
Follow what LLMNR does, and create per-link DnsScope objects.
2015-12-08resolved: add code to join/leave mDNS multicast groupsDaniel Mack
Per link, join the mDNS multicast groups when the scope is created, and leave it again when the scope goes away.
2015-12-08resolved: add packet header details for mDNSDaniel Mack
Validate mDNS queries and responses by looking at some header fields, add mDNS flags.
2015-12-08resolved: add infrastructure for mDNS related socketsDaniel Mack
Just hook up mDNS listeners with an empty packet dispather function, introduce a config directive, man page updates etc.
2015-12-07Merge pull request #2104 from evverx/rlimit-util-testZbigniew Jędrzejewski-Szmek
tests: add test-rlimit-util
2015-12-07basic: add RB-Tree implementationDavid Herrmann
This adds an self-standing RB-Tree implementation to src/basic/. This will be needed for NSEC RR lookups, since we need "close lookups", which hashmaps (not even ordered-hashmaps) can give us in reasonable time.
2015-12-07tests: add test-rlimit-utilEvgeny Vereshchagin
2015-12-07udev/scsi_id: fix some strange indentationZbigniew Jędrzejewski-Szmek
2015-12-07udev: add emacs header lineZbigniew Jędrzejewski-Szmek
Otherwise emacs wants to use 2-space indentation and other attrocities.
2015-12-07udev: fix NULL deref when executing rulesZbigniew Jędrzejewski-Szmek
We quite obviously check whether event->dev_db is nonnull, and right after that call a function which asserts the same. Move the call under the same if. https://bugzilla.redhat.com/show_bug.cgi?id=1283971
2015-12-07libudev: simplify udev_device_ensure_usec_initialized a bitZbigniew Jędrzejewski-Szmek
2015-12-06Merge pull request #2100 from msekletar/nologin-labelLennart Poettering
user-sessions: make sure /run/nologin has correct SELinux label
2015-12-06Merge pull request #2107 from phomes/miscLennart Poettering
Misc cleanups
2015-12-06resolve: remove unused variableThomas Hindoe Paaboel Andersen
2015-12-06shared: include what we useThomas Hindoe Paaboel Andersen
The next step of a general cleanup of our includes. This one mostly adds missing includes but there are a few removals as well.
2015-12-04nspawn: set TasksMax in machined instead of nspawnAlban Crequy
https://github.com/systemd/systemd/issues/2016
2015-12-04login: make sure /run/nologin has correct SELinux labelMichal Sekletar
2015-12-04user-sessions: make sure /run/nologin has correct SELinux labelMichal Sekletar
2015-12-03resolved: update DNSSEC TODO list a bitLennart Poettering
2015-12-03resolved: add a concept of "authenticated" responsesLennart Poettering
This adds a new SD_RESOLVED_AUTHENTICATED flag for responses we return on the bus. When set, then the data has been authenticated. For now this mostly reflects the DNSSEC AD bit, if DNSSEC=trust is set. As soon as the client-side validation is complete it will be hooked up to this flag too. We also set this bit whenver we generated the data ourselves, for example, because it originates in our local LLMNR zone, or from the built-in trust anchor database. The "systemd-resolve-host" tool has been updated to show the flag state for the data it shows.
2015-12-03resolved: when synthesizing NODATA from cached NSEC bitmaps, honour CNAME/DNAMELennart Poettering
When an RR type is not set in an NSEC, then the CNAME/DNAME types might still be, hence check them too. Otherwise we might end up refusing resolving of CNAME'd RRs if we cached an NSEC before.
2015-12-03resolved: maintain a short TODO list for DNSSEC support in the dnssec C ↵Lennart Poettering
files for now
2015-12-03resolved: introduce a dnssec_mode setting per scopeLennart Poettering
The setting controls which kind of DNSSEC validation is done: none at all, trusting the AD bit, or client-side validation. For now, no validation is implemented, hence the setting doesn't do much yet, except of toggling the CD bit in the generated messages if full client-side validation is requested.
2015-12-03resolved: add a limit on the max DNSSEC RRSIG expiry skew we allowLennart Poettering
2015-12-03resolved: add a simple trust anchor database as additional RR sourceLennart Poettering
When doing DNSSEC lookups we need to know one or more DS or DNSKEY RRs as trust anchors to validate lookups. With this change we add a compiled-in trust anchor database, serving the root DS key as of today, retrieved from: https://data.iana.org/root-anchors/root-anchors.xml The interface is kept generic, so that additional DS or DNSKEY RRs may be served via the same interface, for example by provisioning them locally in external files to support "islands" of security. The trust anchor database becomes the fourth source of RRs we maintain, besides, the network, the local cache, and the local zone.
2015-12-03resolved: rework how we allow allow queries to be dispatched to scopesLennart Poettering
Previously, we'd never do any single-label or root domain lookups via DNS, thus leaving single-label lookups to LLMNR and the search path logic in order that single-label names don't leak too easily onto the internet. With this change we open things up a bit, and only prohibit A/AAAA lookups of single-label/root domains, but allow all other lookups. This should provide similar protection, but allow us to resolve DNSKEY+DS RRs for the top-level and root domains. (This also simplifies handling of the search domain detection, and gets rid of dns_scope_has_search_domains() in favour of dns_scope_get_search_domains()).
2015-12-03resolved: don't bother with picking a search domain when searching is disabledLennart Poettering