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tree-wide: do not shadow the global var timezone
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Merge sd_dhcp_server_set_address() and sd_dhcp_server_set_lease_pool() into
sd_dhcp_server_configure_pool() as the behavior of the two former depends
on the order they are called in. The flexibility is not needed, so let's
just do this in one call.
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Rather than having all clients attempt to get the same leases (starting at the
beginning of the pool), make each client star at a random offset into the pool
determined by their client id. This greatly increases the chances of a given
client receiving the same IP address even though both the client and server
have lost any lease information (and distinct server instances handing out
the same leases).
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For now, this is very simple and IP addresses have to be configured
manually.
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This avoids confusion what this is, in particular as libc knows an
index() function.
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If we handly arbitrary data we should use "void*" pointers, not
"uint8_t*", how go intended C to be used.
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Everywhere else we call the generic user data pointer just "userdata",
rather than "user_data". Let's do this here, too.
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No need to invole atomic ops in single-threaded APIs, let's simplify
this.
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This one is simply to add: encode the tzdata timezone in the DHCP
options and optionally make use of it.
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CID 1315105: Resource leaks (RESOURCE_LEAK)
/src/libsystemd-network/sd-dhcp-server.c: 800 in
dhcp_server_handle_message()
*** CID 1315105: Resource leaks (RESOURCE_LEAK)
/src/libsystemd-network/sd-dhcp-server.c: 800 in
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Previously, if the event loop never ran before sd_event_now() would
fail. With this change it will instead fall back to invoking now(). This
way, the function cannot fail anymore, except for programming error when
invoking it with wrong parameters.
This takes into account the fact that many callers did not handle the
error condition correctly, and if the callers did, then they kept simply
invoking now() as fall back on their own. Hence let's shorten the code
using this call, and make things more robust, and let's just fall back
to now() internally.
Whether now() is used or the cache timestamp may still be detected via
the return value of sd_event_now(). If > 0 is returned, then the fall
back to now() was used, if == 0 is returned, then the cached value was
returned.
This patch also simplifies many of the invocations of sd_event_now():
the manual fall back to now() can be removed. Also, in cases where the
call is invoked withing void functions we can now protect the invocation
via assert_se(), acknowledging the fact that the call cannot fail
anymore except for programming errors with the parameters.
This change is inspired by #841.
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It's only marginally shorter then the usual for() loop, but certainly
more readable.
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like:
src/shared/install.c: In function ‘unit_file_lookup_state’:
src/shared/install.c:1861:16: warning: ‘r’ may be used uninitialized in
this function [-Wmaybe-uninitialized]
return r < 0 ? r : state;
^
src/shared/install.c:1796:13: note: ‘r’ was declared here
int r;
^
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This patch removes includes that are not used. The removals were found with
include-what-you-use which checks if any of the symbols from a header is
in use.
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This reverts commit d6d810fbf8071f8510450dbacd1d083f37603656.
It's apparently not OK to pass MSG_CMSG_CLOEXEC to recvmsg() of raw
sockets.
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Like Infiniband. See RFC 4390 section 2.1 for details on DHCP
and Infiniband; chaddr is zeroed, hlen is set to 0, and htype
is set to ARPHRD_INFINIBAND because IB hardware addresses
are 20 bytes in length.
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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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Don't overflow unnecessarily.
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For now we simply take these values from the server's address.
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Force renewing with a pool size of 0 would return the uninitialized r.
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The timeouts in the networking library (DHCP lease timeouts and similar) should not be affected
by suspend. In the cases where CLOCK_BOOTTIME is not implemented, it is still safe to fallback to
CLOCK_MONOTONIC, as the consumers of the library (i.e., networkd) _should_ renew the leases when
coming out of suspend.
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It complains about optoffset possibly being uninitialized. It is wrong,
but let's just initialize it.
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The short lease was useful for testing, but in real-world usage it is pointless to keep leases
this short. That said, the cost of lease renewal is really low, so we keep the lease still
relatively short at one hour to not get into hard-to-hit problems with lease exhaustion etc.
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The destination IP address should be INADDR_BROADCAST, but was
accidentally left as INADDR_ANY.
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Removes _cleanup_dhcp_lease_free_. While the automatic cleanup
functions are great to have this one is never used and causes
a warning in clang.
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No need to use HASHMAP_ITERATE when we destruct all entries anyway.
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We must use free instead of dhcp_lease_free here to avoid freeing
client_id.data.
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Make sure we don't hand out the same IP twice. We still don't
handle lease expiry.
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We would like to use the UDP socket, but we cannot as we need to specify
the MAC address manually.
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Parse the maximum message size the client can accept and the client id, falling back to
sane defaults if they are not set.
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We will (at least at first), restrict our focus to running the server
on at most one interface.
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