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hashmap/siphash24: refactor hash functions
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Make sure all variable-length inputs are properly terminated or that
their length is encoded in some way. This avoids ambiguity of
adjacent inputs.
E.g., in case of a hash function taking two strings, compressing "ab"
followed by "c" is now distinct from "a" followed by "bc".
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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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Add some tests to simulate the reception of LLDP frames and to verify
the correctness of the data in the MIB.
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tlv_packet_read_bytes() and tlv_packet_read_string() returned the
wrong length when called after other functions which modify the offset
in the container.
In other words, if the TLV data length is X and we do a
tlv_packet_read_u8(), a subsequent tlv_packet_read_bytes() should
return a length of (X - 1).
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In order to implement tests for the LLDP state machine, we need to
mock lldp_network_bind_raw_socket(). Move the other function
lldp_receive_packet() to another file so that we can replace the first
function with a custom one and keep the second one.
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LLDP TLVs of type 127 are used to carry organizationally specific
information and include additional fields to specify the OUI and
subtype.
Add support for parsing such fields and functions to access the most
common IEEE 802.1 specific TLVs.
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It can be useful to know the destination address of a LLDP frame
because it determines the scope of propagation of the frame and thus
this information be used to know whether the neighbor is connected to
the same physical link.
See clause 7.1 of IEEE Std 802.1AB-2009.
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Add a public function to get a list of current LLDP neighbours' TLV
packets. The function populates an array of pointers to the opaque
type sd_lldp_packet and returns the number of elements found. Callers
must take care of freeing the array and decreasing the refcount of
elements when done.
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Move some public functions from lldp-internal.c to lldp-tlv.c, as now
they are not internal functions anymore.
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Export struct tlv_packet as a public opaque sd_lldp_packet type and
make its accessor functions public.
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These functions are going to be exported, swap the 'data' and 'length'
arguments so that their signature is consistent with the rest of the
code.
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Add a reference counter to the tlv_packet structure so that it can be
shared between multiple users and properly free'd when no longer in
use.
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DHCP and journal remoting fix, as well as NEWS update
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sd-pppoe: use strna() instead of strempty()
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Fixes #1337
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In cases where we use for instance. log_debug() with a statement + string
it is better to output (Service-name: N/A) instead of (Service-name: )
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Let's clean up our tree a bit, and reduce invocations of the
thread-unsafe strerror() by replacing it with printf()'s %m specifier.
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- Rely everywhere that we use abs() on the error code passed in anyway,
thus don't need to explicitly negate what we pass in
- Never attach synthetic error number information to log messages. Only
log about errors we *receive* with the error number we got there,
don't log any synthetic error, that don#t even propagate, but just eat
up.
- Be more careful with attaching exactly the error we get, instead of
errno or unrelated errors randomly.
- Fix one occasion where the error number and line number got swapped.
- Make sure we never tape over OOM issues, or inability to resolve
specifiers
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Also add a Coccinell patch to detect such locations in the future.
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sd-dhcp6: ensure canceling lease timers and refactor setting lease
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Update the test case to stop the ongoing Information Request exchange
before unsetting its state. To keep the test case callback verification
simpler, temporarily unset the callback function before stopping.
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Prevent modifications to index, MAC address, DUID and Information
Request while the DHCPv6 client is running.
Require the DHCPv6 client to be stopped first instead of always
unconditionally restarting it if the caller calls
sd_dhcp6_client_start() more than once. With this change, handling
of for example incoming Router Advertisments becomes much easier.
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Currently, sd-lldp.h exports "UPDATE_INFO".. and defines it to a magic
constant '10'. This is completely bogus, so fix it to follow our coding
standards:
- Prefix exported symbols by SD_LLDP_*
- Define a separate event-enum for event types
- Translate internal state to external event-types
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Don't export constant that are only used internally.
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Prefix all exported constants by SD_PPPOE_* to avoid namespacing
conflicts.
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Prefix all exported constants with SD_IPV4LL_* to avoid namespacing
conflicts.
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Prefix all exported constants with SD_IPV4ACD to prevent namespacing
conflicts.
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Prefix all exported constants by SD_ICMP6_ND_* to avoid any namespacing
conflicts.
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Prefix all exported constants with SD_DHCP6_CLIENT_* to avoid any
namespacing conflicts.
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Prefix all constants with SD_DHCP_CLIENT_* to avoid namespacing
conflicts.
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Factor our common code to set/clear the client lease.
Resetting the lease involves canceling old timers.
Also, most importantly, when resetting the lease
in client_receive_advertise(), ensure to cancel
the timers too. It is not immediately clear, why
at that point no timers would be pending.
The lease-unref from sd_dhcp6_client_unref() can
be omited, because of the preceeding client_reset()
call.
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ipv4ll use an unsigned instead of an uint8_t array. Hence, use an
unsigned seed instead of declaring an array and then dereferencing it
later.
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Now that seed is an unsigned and not an array, we do not need to assert
on it.
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These programs should be run manually, typically two instances on a
veth pair to check conflict detection.
Both test programs take the ifname as input, the ACD also takes the
IP address to check, whereas LL (optionally) takes the seed, which
determines the sequence of IP addresses to try.
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This splits the Address Conflict Detection out of the Link Local
library so that we can reuse it for DHCP and static addresses in
the future.
Implements RFC5227.
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Use stop() and start() to drop some pulicate code.
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Firstly, no longer distinguish between STOP and INIT states.
Secondly, do not trigger STOP events when calls to sd_ipv4ll_*() fail. The
caller is the one who would receive the event and will already know that the
call to sd_ipv4ll_*() has failed, so it is redundant.
STOP events will now only be triggered by calling sd_ipv4ll_stop() explicitly
or by some internal error in the library triggered by receiving a packet or
an expiring timeout (i.e., any error that would otherwise not be reported
back to the consumer of the library).
Lastly, follow CODING_STYLE and always return NULL on unref. Protect from
objects being destroyed in callbacks accordingly.
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This requires the caller to stop and restart the statemachine if they want to
change the MAC address.
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Simplify timeout handling.
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Most packets are filtered out by the BPF, so only check for the parts that may
actually differ.
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Simplify the code a bit, no functional change.
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We currently process every ARP packet, but we should only care about the ones
relating to our IP address.
Also rename ipv4ll helpers to apr-utils.[ch], and rework the helpers a bit.
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Patch via coccinelle.
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Introduce a proper enum, and don't pass around string ids anymore. This
simplifies things quite a bit, and makes virtualization detection more
similar to architecture detection.
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