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Start the DHCPv6 test case by sending an Information Request, verifying
the reply and continuing at once with the normal address acquisition
procedure. Reuse the DHCPv6 Solicit Reply so that the client code is
verified to ignore any erroneously added IPv6 address information.
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Implement Information Request message according to RFC 3315, section
18.1.5. with the excepion that the first message is not delayed by a
random amount. Instead systemd-networkd is supposed to take care of
desynchronizing between other clients.
Initialize the DHCPv6 client structure in sd_dhcp6_client_start()
as this allows toggling between information request and normal
DHCPv6 address aquisition modes.
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Suppyling a NULL lease is not a condition that needs to be asserted,
returning -EINVAL is informative enough to the caller. This simplifies
calling code and doesn't falsely indicate that something erroneous was
attempted.
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When all DHCPv6 options have been parsed, dhcp6_option_parse() returns
-ENOMSG. Explicitely set the return value to indicate success so that
later code does not need to take this special value into account.
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inet_ntoa() uses a static buffer, so you can't call it twice in the
same fprintf() call.
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This has been requested repeatedly, so let's give it a go. We explicitly do not allow matching
on names that have already been changed (from a previous udev run, or otherwise), and matching
on unpredictable names (ethX) is discouraged (but not currently disallowed).
We also currently allow:
[Match]
Name=veth0
[Link]
Name=my-name0
SomeOtherSetting=true
Which means that the link file will be applied the first time it is invoked, but
not on subsequent invocations, which may be surprising.
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Otherwise they can be optimized away with -DNDEBUG
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It corrrectly handles both positive and negative errno values.
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As a followup to 086891e5c1 "log: add an "error" parameter to all
low-level logging calls and intrdouce log_error_errno() as log calls
that take error numbers", use sed to convert the simple cases to use
the new macros:
find . -name '*.[ch]' | xargs sed -r -i -e \
's/log_(debug|info|notice|warning|error|emergency)\("(.*)%s"(.*), strerror\(-([a-zA-Z_]+)\)\);/log_\1_errno(-\4, "\2%m"\3);/'
Multi-line log_*() invocations are not covered.
And we also should add log_unit_*_errno().
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- Rename log_meta() → log_internal(), to follow naming scheme of most
other log functions that are usually invoked through macros, but never
directly.
- Rename log_info_object() to log_object_info(), simply because the
object should be before any other parameters, to follow OO-style
programming style.
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log_error_errno() as log calls that take error numbers
This change has two benefits:
- The format string %m will now resolve to the specified error (or to
errno if the specified error is 0. This allows getting rid of a ton of
strerror() invocations, a function that is not thread-safe.
- The specified error can be passed to the journal in the ERRNO= field.
Now of course, we just need somebody to convert all cases of this:
log_error("Something happened: %s", strerror(-r));
into thus:
log_error_errno(-r, "Something happened: %m");
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The lease is usually tied to the client ID, so users of the
lease may want to know what client ID it was acquired with.
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The client identifier can be in many different formats, not just
the one that systemd creates from the Ethernet MAC address. Non-
ethernet interfaces may have different client IDs formats. Users
may also have custom client IDs that the wish to use to preserve
lease options delivered by servers configured with the existing
client ID.
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Based on patch by Dan Williams.
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client->secs wasn't getting set in the REBOOT state, causing
an assertion. REBOOT should work the same way as INIT, per
RFC 2131:
secs 2 Filled in by client, seconds elapsed since client
began address acquisition or renewal process.
REBOOT is necessary because some DHCP servers (eg on
home routers) do not hand back the same IP address unless the
'ciaddr' field is filled with that address, which DISCOVER
cannot do per the RFCs. This leads to multiple leases
on machine reboot or DHCP client restart.
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Now that we only have one file with condition implementations around, we
can drop the -util suffix and simplify things a bit.
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That way only one file with condition code remaining, in src/shared/,
rather than src/core/.
Next step: dropping the "-util" suffix from condition-util.[ch].
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Also, implement the negation check inside of condition_test() instead of
individually in each test function.
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Thanks to Daniele Medri
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The compiler will do this for us.
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To mirror the recent name change of the concept for sd_bus objects,
follow the same logic for sd_event_source objects, too.
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On older kernels before this patch:
https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=e8b671460410c8fd996c8a1c228b718c547cc236
ppp-ioctl.h did not pull in ppp_defs.h which results in build errors
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This library negotiates a PPPoE channel. It handles the discovery stage and
leaves the session stage to the kernel. A further PPP library is needed to
actually set up a PPP unit (negotatie LCP, IPCP and do authentication), so in
isolation this is not yet very useful.
The test program has two modes:
# ./test-pppoe
will create a veth tunnel in a new network namespace, start pppoe-server on one
end and this client library on the other. The pppd server will time out as no
LCP is performed, and the client will then shut down gracefully.
# ./test-pppoe eth0
will run the client on eth0 (or any other netdev), and requires a PPPoE server
to be reachable on the local link.
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The duid data passed by the caller does not include the DUID type,
but sd_dhcp6_client_set_duid() was treating it like it did.
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Also change the default prefixlen function to only access the first octet of the in_addr.
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The raw socket sd_event_source used for DHCP server solicitations
was simply dropped on the floor when creating the new UDP socket
after a lease has been acquired. Clean it up properly so we're
not still listening and responding to events on it.
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These use the (deprecated) IPv4 address classes to deduce the corresponding subnet masks. This is useful when addresses
without subnet masks and prefix lengths are given.
Make use of these new functions from sd-dhcp-lease.
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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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With this change the DHCP6_OPTION_IAADDR_LEN define can be removed in
favor of using sizeof(). Using the name of the struct and sizeof()
makes it clearer how much and what data is being copied from the
DHCPv6 message.
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This would make it simple to verify that the data is on the right format when
the type is known.
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The caller may have an existing DUID that it wants to use, and may
want to use some other DUID generation scheme than systemd's
default DUID-EN.
[tomegun: whitespace - we never use tabs]
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Otherwise we would get a nullptr dereference later on.
Found by coverity. Fixes CID #1237655.
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Don't manually free 'n' in error path as it's already tagged
_cleanup_free_ and will be freed once it goes out of scope,
leading to double-free in this case.
Found with coverity. Fixes: CID#1237786
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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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The magic cookie is set in dhcp_message_init. Test the magic cookie
value intead of writing the last 3/4 of it directly.
Found with Coverity. Fixes: CID#1237732 CID#1237734 CID#1237735
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Verify that the Elapsed Time option is present.
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Implement Elapsed Time option as it is defined as MUST in RFC 3315,
section 22.9. The elapsed time value is a 1/100th of a second with
a max value of 0xffff, i.e. 655.35 seconds.
As the main loop might not be running yet when sd_dhcp6_client_start() is
called, fetch the monotonic time directly and not from the event loop
while in state DHCP6_STATE_STOPPED.
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Also make pointer calculations more explicit so they are
easier to understand.
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The whole DHCPv6 test message length was incorrectly used as the length
of DHCPv6 options causing the following bad memory access:
$ build/test-dhcp6-client
Assertion 'interface_index >= -1' failed at ../src/libsystemd-network/sd-dhcp6-client.c:129, function sd_dhcp6_client_set_index(). Ignoring.
=================================================================
==29135==ERROR: AddressSanitizer: global-buffer-overflow on address 0x7fe204aa9148 at pc 0x7fe204a5958f bp 0x7fff3e47d470 sp 0x7fff3e47d460
READ of size 1 at 0x7fe204aa9148 thread T0
#0 0x7fe204a5958e in option_parse_hdr ../src/libsystemd-network/dhcp6-option.c:145
#1 0x7fe204a59884 in dhcp6_option_parse ../src/libsystemd-network/dhcp6-option.c:165
#2 0x7fe204a4eb9c in test_advertise_option ../src/libsystemd-network/test-dhcp6-client.c:227
#3 0x7fe204a51c58 in main ../src/libsystemd-network/test-dhcp6-client.c:584
#4 0x7fe2031590df in __libc_start_main (/lib64/libc.so.6+0x200df)
#5 0x7fe204a4cc5b (/home/test/systemd/build/test-dhcp6-client+0x25c5b)
0x7fe204aa9148 is located 2 bytes to the right of global variable 'msg_advertise' from '../src/libsystemd-network/test-dhcp6-client.c' (0x7fe204aa9080) of size 198
0x7fe204aa9148 is located 56 bytes to the left of global variable 'msg_reply' from '../src/libsystemd-network/test-dhcp6-client.c' (0x7fe204aa9180) of size 173
SUMMARY: AddressSanitizer: global-buffer-overflow ../src/libsystemd-network/dhcp6-option.c:145 option_parse_hdr
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