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Based on 51053ebb9ea7068b7a4e6bff11a470d4c4dedb37
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In some situations, we want to execute an external shell command
in a non-blocking way. Similar to 'system', but without waiting for
the child to complete. We also want to close all file descriptors
ahead of the exec() and filter + modify the environment.
Change-Id: Ib24ac8a083db32e55402ce496a5eabd8749cc888
Related: OS#4332
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Make build and external tests work with python3, so we can drop
the python2 dependency.
This should be merged shortly after osmo-python-tests was migrated to
python3, and the jenkins build slaves were (automatically) updated to
have the new osmo-python-tests installed.
Related: OS#2819
Depends: osmo-python-tests I3ffc3519bf6c22536a49dad7a966188ddad351a7
Change-Id: I84ef43f700e125c7a65f92347f12844e07e65655
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This is a bit of a hack, as we want to maintain binary compatibility
without breaking existing users of libosmocore. To do so, we use the
'num_auth_vectors' field in two ways now:
* In the existing use case as part of SEND_AUTH_INFO_RESPONSE, it
indicates the number of vectors stored in the 'auth_vectors' field
* In the new use case as part of SEND_AUTH_INFO_REQUEST, it indicates
the number of vectors actually requested by the MSC/SGSN/MME.
Change-Id: Iaecc47280f8ce54f3e3a888c1cfc160735483d0f
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Change-Id: Idbc1557739b2a253b73914e6f1f18a6d169d882e
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Provide string escaping that
- returns the required buffer size, so it can be used with OSMO_STRBUF_APPEND().
- uses C compatible string constant escaping sequences.
This is intended as a replacement for all previous osmo_escape_str* and
osmo_quote_str* API. It pains me that I didn't get them right the first nor the
second time:
- The buffer functions do not return the chars needed, which is required for
allocating sufficient memory in the *_c versions of the functions.
- Because of that, these functions are accurately usable for
OSMO_STRBUF_APPEND(), producing truncated strings, for example when dumping a
GSUP message.
- They do not use the C equivalent string constant escaping: for some reason I
thought "\15" would be valid, but it should be "\x0f".
If I could, I would completely drop those mislead implementations ... but
backwards compat prohibits that.
A previous patch already provided internal static functions that accurately
return the required buffer size. Enhance these to also support C compatible
string escaping, and use them as implementation of the new functions:
osmo_escape_cstr_buf()
osmo_escape_cstr_c()
osmo_quote_cstr_buf()
osmo_quote_cstr_c()
In the tests for these, also test C string equivalence.
Naming: from API versions, it would be kind of logical to call them
osmo_escape_str_buf3() and osmo_escape_str_c2(). Since these anyway return a
different escaping, it makes sense to me to have distinct names instead.
Quasi missing are variants of the non-C-compatible weird legacy escaping that
return the required buffer size, but I refrain from adding those, because we
have enough API cruft as it is. Just always use these new cstr variants.
Change-Id: I3dfb892036e01000033dd8e7e4a6a0c32a3caa9b
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Keep track of parent nodes and go back hierarchically, not only for .cfg file
reading, but also for telnet VTY sessions.
A long time ago cfg file parsing was made strictly hierarchical: node exits go
back to parent nodes exactly as they were entered. However, live telnet VTY
sessions still lacked this and depended on the go_parent_cb().
From this commit on, implementing a go_parent_cb() is completely optional. The
go_parent_cb() no longer has the task to determine the correct parent node,
neither for cfg files (as already the case before this patch) nor for telnet
VTY sessions (added by this patch). Instead, a go_parent_cb() implementation
can merely take actions it requires on node exits, for example applying some
config when leaving a specific node.
The node value that is returned by the go_parent_cb() and the vty->node and
vty->index values that might be set are completely ignored; instead the
implicit parent node tracking determines the parent and node object.
As a side effect, the is_config_node() callback is no longer needed, since the
VTY now always implicitly knows when to exit back to the CONFIG_NODE.
For example, osmo_ss7_is_config_node() could now be dropped, and the
osmo_ss7_vty_go_parent() could be shortened by five switch cases, does no
longer need to set vty->node nor vty->index and could thus be shortened to:
int osmo_ss7_vty_go_parent(struct vty *vty)
{
struct osmo_ss7_asp *asp;
struct osmo_xua_server *oxs;
switch (vty->node) {
case L_CS7_ASP_NODE:
asp = vty->index;
/* If no local addr was set */
if (!asp->cfg.local.host_cnt) {
asp->cfg.local.host[0] = NULL;
asp->cfg.local.host_cnt = 1;
}
osmo_ss7_asp_restart(asp);
break;
case L_CS7_XUA_NODE:
oxs = vty->index;
/* If no local addr was set, or erased after _create(): */
if (!oxs->cfg.local.host_cnt)
osmo_ss7_xua_server_set_local_host(oxs, NULL);
if (osmo_ss7_xua_server_bind(oxs) < 0)
vty_out(vty, "%% Unable to bind xUA server to IP(s)%s", VTY_NEWLINE);
break;
}
return 0;
}
Before parent tracking, every program was required to write a go_parent_cb()
which has to return every node's parent node, basically a switch() statement
that manually traces the way back out of child nodes. If the go_parent_cb() has
errors, we may wildly jump around the node tree: a common error is to jump
right out to the top config node with one exit, even though we were N levels
deep. This kind of error has been eliminated for cfg files long ago, but still
exists for telnet VTY sessions, which this patch fixes.
This came up when I was adding multi-level config nodes to osmo-hlr to support
Distributed GSM / remote MS lookup: the config file worked fine, while vty node
tests failed to exit to the correct nodes.
Change-Id: I2b32b4fe20732728db6e9cdac7e484d96ab86dc5
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Follow up for patch I3cf150cc0cc06dd36039fbde091bc71b01697322
osmo_sockaddr_str_{from,to}_32n actually use host byte order. Deprecate these
and introduce a more accurately named version ending in h.
Change-Id: Ic7fc279bf3c741811cfc002538e28e8f8560e338
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When finding a char in a string, I want to be able to limit the search area by
size, not only by nul terminator.
Change-Id: I48f8ace9f51f8a06796648883afcabe3b4e8b537
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A couple of times recently I've needed to copy out a substring to a buffer with
limited size. Use of strncpy() or osmo_strlcpy() are nontrivial here.
I wanted to have a dedicated function.
After I wrote that function with a test, I noticed that I had already
implemented the same thing a while ago, as osmo_print_n() :P
So here is just the test.
Change-Id: Ia716abdc1f58af6065b84f4f567388a32a7b39fc
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Provide a common implementation for foo_name_c() functions that base on
foo_name_buf() functions.
char *foo_name_c(void *ctx, example_t arg)
{
OSMO_NAME_C_IMPL(ctx, 64, "ERROR", foo_name_buf, arg)
}
Rationale: the most efficient way of composing strings that have optional parts
or require loops for composition is by writing to a ready char[], and this in
turn is easiest done by using OSMO_STRBUF_* API. Using such a basic name string
implementation which typically returns a length, I often want a more convenient
version that returns a char*, which can just be inlined in a "%s" string format
-- crucially: skipping string composition when inlined in a LOGP(). This common
implementation allows saving code dup, only the function signature is needed.
Why not include the function signature in the macro? The two sets of varargs
(1: signature args, 2: function call args) are hard to do. Also, having an
explicit signature is good for readability and code grepping / ctags.
Upcoming uses: in libosmocore in the mslookup (D-GSM) implementation
(osmo_mslookup_result_name_c()), and in osmo_msc's codec negotiation
implementation (sdp_audio_codecs_name_c(), sdp_msg_name_c(), ...).
I54b6c0810f181259da307078977d9ef3d90458c9 (libosmocore)
If3ce23cd5bab15e2ab4c52ef3e4c75979dffe931 (osmo-msc)
Change-Id: Ida5ba8d9640ea641aafef0236800f6d489d3d322
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Of course both v4 and v6 addresses are kept in network byte order when
represented in bytes, but when writing, I somehow must have assumed that
inet_pton() returns host byte order. Fix that mixup in the API docs:
osmo_sockaddr_str_from_32() and osmo_sockaddr_str_to_32() actually use network
byte order.
osmo_sockaddr_str_from_32n() and osmo_sockaddr_str_to_32n() actually use host
byte order, though reflecting 'n' in their name.
sockaddr_str_test: use hexdump instead of %x to show the
osmo_sockaddr_str_to_32*() conversions so that the error becomes obvious.
(Printing %x reverses the bytes again and made it look correct.)
Change-Id: I3cf150cc0cc06dd36039fbde091bc71b01697322
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It's hard to figure out what color logging categories have with those ANSI
color code strings. Instead, define these OSMO_LOGCOLOR_* constants.
Naming: commonly, the logging.h header has the "LOG" prefix in the name, but it
seems saner to include the OSMO_ prefix: it seems too likely that some
libosmocore user somewhere already has defined "LOGCOLOR_RED" somewhere.
Change-Id: I03b6b1f73ae7ee61d37ff921e071a3d0881d3e9a
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Currently planned user: for Distributed GSM in osmo-hlr: setting per-MSC
service addresses in VTY: replace/remove existing entries.
osmo_sockaddr_str_cmp() is useful to catch identical resulting IP addresses,
regardless of differing strings (e.g. '0::' and '::' are equal but differ in
strings).
Change-Id: I0dbc1cf707098dcda75f8e07c1b936951f9f9501
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Setting vty->fd to 0 is a bad idea, which may cause the process
to write() warnings to its own _stdin_ (yes, it's possible).
For example, when a configuration file contains deprecated
logging commands. Let's use stderr by default.
Change-Id: Icdeaea67a06da3a2f07b252e455629559ecc1829
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We shall not prevent programs from starting if their configuration
files contain deprecated 'logging level ...' commands. Just print
a warning and return CMD_SUCCESS instead of CMD_WARNING.
While writing a unit test, another funny bug has been uncovered.
Parsing of a deprecated command indeed triggers a deprecation
warning, originated from libosmovty's log_deprecated_func().
This function simply calls vty_out(), but...
Since the invocation of the vty_out() happens _before_ the VTY
is initialized, the process is actually writing that warning
to its own stdin! Most likely, because we use talloc_zero()
to allocate a new instance of struct 'vty'.
As a side effect, the evil warning magically appears in the output
of 'make check', breaking the test statistics. Let's work around
this bug for now by redirecting stdin to /dev/null.
Change-Id: Ia934581410cd41594791d4e14ee74c16abe1009a
Fixes: Ic9c1b566ec4a459f03e6319cf369691903cf9d00
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The format prints IP:port separated by a colon, which of course is confusing
when the IPv6 address itself contains mostly colons. The new format adds square
braces.
cafe:face::1:42 -> [cafe:face::1]:42
The IPv4 format remains unchanged:
1.2.3.4:42
Change-Id: I161f8427729ae31be0eac719b7a4a9290715e37f
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This shows the weird format choice for showing IPv6 addresses' port, fixed in
subsequent patch.
Change-Id: I8e5ebfbbc3a2b88aed820e8f845d9f6ededb29de
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Only known user of API is in osmocom-bb and it compiles fine after the
change.
Related: OS#4244
Change-Id: Ia10345008b3aca50b30482ef3b852b03eca71995
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Related: OS#4244
Change-Id: I32e9cc1c2397b44f0d48db2acdf782a821365b63
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Often, an IP address of 0.0.0.0 is considered an unset value (for clients
requiring a server address; not for listening on "any").
osmo_sockaddr_str_is_set() does return false when the port is 0, but there is
no simple way to tell whether the IP address is actually set to a server
address.
Add osmo_sockaddr_str_is_nonzero() to return false if:
- the port is zero, or
- the IP address is zero (0.0.0.0 or ::0), or
- the IP address cannot be parsed.
A practical use example: osmo-msc so far accepts an RTP IP address of 0.0.0.0
as valid. I noticed when trying to trigger error handling from a ttcn3 test.
osmo-msc can use this function to reject invalid addresses from MGCP messages.
Related: I53ddb19a70fda3deb906464e1b89c12d9b4c7cbd (osmo-msc)
Change-Id: I73cbcab90cffcdc9a5f8d5281c57c1f87b2c3550
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Refuse state changes and event dispatch for FSM instances that are already
terminating.
It is assumed that refusing state changes and events after FSM termination is
seen as the sane expected behavior, hence this change in behavior is merged
without being configurable.
There is no fallout in current Osmocom code trees. fsm_dealloc_test needs a
changed expected output, since it is explicitly creating complex FSM structures
that terminate. Currently no other C test in Osmocom code needs adjusting.
Rationale:
Where multiple FSM instances are collaborating (like in osmo-bsc or osmo-msc),
a terminating FSM instance often causes events to be dispatched back to itself,
or causes state changes in FSM instances that are already terminating. That is
hard to avoid, since each FSM instance could be a cause of failure, and wants
to notify all the others of that, which in turn often choose to terminate.
Another use case: any function that dispatches events or state changes to more
than one FSM instance must be sure that after the first event dispatch, the
second FSM instance is in fact still allocated. Furthermore, if the second FSM
instance *has* terminated from the first dispatch, this often means that no
more actions should be taken. That could be done by an explicit check for
fsm->proc.terminating, but a more general solution is to do this check
internally in fsm.c.
In practice, I need this to avoid a crash in libosmo-mgcp-client, when an
on_success() event dispatch causes the MGCP endpoint FSM to deallocate. The
earlier dealloc-in-main-loop patch fixed part of it, but not all.
Change-Id: Ia81a0892f710db86bd977462730b69f0dcc78f8c
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This is a simpler and more general solution to the problem so far solved by
osmo_fsm_term_safely(true). This extends use-after-free fixes to arbitrary
functions, not only FSM instances during termination.
The aim is to defer talloc_free() until back in the main loop.
Rationale: I discovered an osmo-msc use-after-free crash from an invalid
message, caused by this pattern:
void event_action()
{
osmo_fsm_inst_dispatch(foo, FOO_EVENT, NULL);
osmo_fsm_inst_dispatch(bar, BAR_EVENT, NULL);
}
Usually, FOO_EVENT takes successful action, and afterwards we also notify bar.
However, in this particular case, FOO_EVENT caused failure, and the immediate
error handling directly terminated and deallocated bar. In such a case,
dispatching BAR_EVENT causes a use-after-free; this constituted a DoS vector
just from sending messages that cause *any* failure during the first event
dispatch.
Instead, when this is enabled, we do not deallocate 'foo' until event_action()
has returned back to the main loop.
Test: duplicate fsm_dealloc_test.c using this, and print the number of items
deallocated in each test loop, to ensure the feature works. We also verify that
the deallocation safety works simply by fsm_dealloc_test.c not crashing.
We should probably follow up by refusing event dispatch and state transitions
for FSM instances that are terminating or already terminated:
see I0adc13a1a998e953b6c850efa2761350dd07e03a.
Change-Id: Ief4dba9ea587c9b4aea69993e965fbb20fb80e78
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The calculation of the beginning of a block for TCH/F, TCH/H and FACCH
can be challenging since those channels are affected by the diagonal
interleaving of the TCH channels. However, GSM 05.02 Section 7 Table 1
of 5 specifies how the blocks are distributed over the TDMA frame
interval. Lets add a mapping function that is based on that table
Related: OS#3803
Change-Id: I3d71c66f8c401f5afbad9b1c86c24580dab9e0ce
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Otherwise bad configurations can easily sneak in and produce unexpected
behavior.
Change-Id: Ic9c1b566ec4a459f03e6319cf369691903cf9d00
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log_enable_multithread() enables use of locks inside the
implementation. Lock use is disabled by default, this way only
multi-thread processes need to enable it and suffer related
complexity/performance penalties.
Locks are required around osmo_log_target_list and items inside it,
since targets can be used, modified and deleted by different threads
concurrently (for instance, user writing "logging disable" in VTY while
another thread is willing to write into that target).
Multithread apps and libraries aiming at being used in multithread apps
should update their code to use the locks introduced here when
containing code iterating over osmo_log_target_list explictly or
implicitly by obtaining a log_target (eg. osmo_log_vty2tgt()).
Related: OS#4088
Change-Id: Id7711893b34263baacac6caf4d489467053131bb
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Change-Id: I436daa804aac11622fde24afe9ea35193d9e9beb
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This is useful for timers expected to have a range of valid or expected
values.
Validation is done at runtime when timer values are set by the app or by
the user through the VTY.
Related: OS#4190
Change-Id: I4661ac41c29a009a1d5fc57d87aaee6041c7d1b2
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OSMO_GSUP_SUPPORTED_RAT_TYPES_IE corresponds to the Supported RAT Types
Indicator from 3GPP TS 29.002. See 8.1.2 MAP_UPDATE_LOCATION service,
which indicates the capabilities of the MSC/VLR to the HLR.
So far, have room for eight RAT types in the gsup_msg. That is an arbitrary
random choice without any rationale.
OSMO_GSUP_CURRENT_RAT_TYPE_IE is useful to communicate the currently
used RAN / RAT type of the current subscriber during Location Updating Request.
Change-Id: I93850710ab55a605bf61b95063a69682a2899bb1
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Since structure 'osmo_gcr_parsed' does contain arrays, GCC is not
happy about the way we initialize it. Let's do it explicitly.
Change-Id: Ia814b4a4ed5bec84ff1f69232f7f7d5ca0d19794
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Change-Id: I4b9e12e34f69d98fa87179c7ee390e31001ec943
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The ECU implementation for FR is currently tested by calling the related
functions directly and by using the generic ECU abstraction layer. However,
the test "test_fr_concealment" only tests directly. Lets add a version
that uses the generic ECU abstraction layer as well.
The generic ECU abstraction layer obsolets the public API functions
osmo_ecu_fr_reset() and osmo_ecu_fr_conceal(), lets tag those functions
as dprecated.
Change-Id: Ib0c8a9b164f14ea4fa00688f760a76cdb4890af4
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We don't want to expose the details of a given ECU implementation to
the user (e.g. osmo-bts), but have a generic abstraction layer where
an ECU implementation can simply register a few call-back functions
with the generic core.
As the developer and copyright holder of the related code, I hereby
state that any ECU implementation using 'struct osmo_ecu_ops' and
registering with the 'osmo_ecu_register()' function shall not be
considered as a derivative work under any applicable copyright law;
the copyleft terms of GPLv2 shall hence not apply to any such ECU
implementation.
The intent of the above exception is to allow anyone to combine
third party Error Concealment Unit implementations with libosmocore,
including but not limited to such published by ETSI.
Change-Id: I4d33c9c7c2d4c7462ff38a49c178b65accae1915
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Rather than having applications maintain their own talloc cotexts,
let's offer some root talloc contexts in libosmocore. Let's also
make them per thread right from the beginning. This will help
some multi-threaded applications to use talloc in a thread-safe
way.
Change-Id: Iae39cd57274bf6753ecaf186f229e582b42662e3
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When reading SUT logs resulting from TTCN3 runs, it can be hard to figure out
which log section corresponds to which test code. Add a 'logp' command on VIEW
and ENABLE nodes that simply echos an arbitrary message on log output, useful
to set markers / explanations from the TTCN3 code, which then appear in all log
outputs and can make it trivial to figure out which log section is interesting.
logging_vty_test# logp lglobal notice This is the log message
DLGLOBAL NOTICE This is the log message
From TTCN3, could be used like this, e.g. in BSC_Tests.ttcn:
private function f_logp(charstring log_msg) runs on MSC_ConnHdlr
{
// log on TTCN3 log output
log(log_msg);
// log in stderr log
f_vty_transceive(BSCVTY, "logp lglobal notice " & log_msg);
}
...
f_logp("f_probe_for_handover(" & log_label & "): Ending the test: Handover Failure stops the procedure.");
Change-Id: Ife5dc8999174c74e0d133729284fe526d6eaf8d9
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Since March 15th 2017, libosmocore API logging_vty_add_cmds() had its
parameter removed (c65c5b4ea075ef6cef11fff9442ae0b15c1d6af7). However,
definition in C file doesn't contain "(void)", which means number of
parameters is undefined and thus compiler doesn't complain. Let's remove
parameters from all callers before enforcing "(void)" on it.
Related: OS#4138
Change-Id: Iaea795521361a8e5b3b45eaeb35e6eda69163af3
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After recent system upgrade, gcc 9.1.0, I started getting gsm0808_test
failing locally:
Assert failed memcmp(&enc_ct, &dec_ct, sizeof(enc_ct)) == 0 libosmocore/tests/gsm0808/gsm0808_test.c:992
During investigation with gdb, fields of both structures seem to contain
same values. However, closer lookup gives some hints on why it fails:
(gdb) print memcmp(&enc_ct, &dec_ct, sizeof(enc_ct))
$1 = 85
(gdb) print memcmp(&enc_ct, &dec_ct, 12)
$14 = 85
(gdb) print ((uint8_t*)&enc_ct)[11]
$15 = 85 'U'
(gdb) print ((uint8_t*)&dec_ct)[11]
$16 = 0 '\000'
So the 12th byte in struct gsm0808_channel_type is basically an
alignment padding byte added by the compiler (to align perm_spch_len to
4-byte alignment). Since both compared structs are initialized without
memset(0) but using compiler's designated initializers, it seems the compiler
decided it's no longer needed to zero the padding byte, making memcp fail in
this case.
In order to avoid the failure, let's properly check every field instead
of using memcp here.
Change-Id: I17fe7a0a5dc650f050bba1f47d071be749550729
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When using `OSMO_ASSERT(exp);` clang will warn about
an empty expression because the semi colon was superflous.
Use do {} while (0) to enfore the need of a semi colon.
This might break other test.
Change-Id: I2272d29a81496164bebd1696a694383a28a86434
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incomplete to vty func
For instance, take command "single0 [one]":
If user executes "single0 on", VTY func will receive argv[0]="one"
instead of argv[0]="on".
Related: OS#4045
Change-Id: I5f4e2d16c62a2d22717989c6acc77450957168cb
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