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inner block defined variable "enum match_type ret" was being masking
outter block variable "int ret = 0". The ret variable was being given
non zero values only inside the inner block, so that change was done on
the inner variable and not the outer one, which is returned.
Fixes: 5314c513f23688462d7f7937e5ae5e0d5cd4548e
Change-Id: Iec87d7db49a096d07e38ff8a060b923a52bfd6ba
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Return ENOSPC if the decoding buffer is one byte too small, instead of
returning 0 and silently truncating the string. Add a new "truncated"
variable to detect if the loop breaks in the final iteration.
The string is not truncated if there is exactly one 0xf ('\0') higher
nibble remaining. This is covered by the existing test case "long
15-digit (maximum) MSISDN, limited buffer".
Related: OS#4049
Change-Id: Ie05900aca50cc7fe8a45d17844dbfcd905fd82fe
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This patch is a result of discussion we had in [1]. The key idea
is that libosmovty should properly auto-complete the commands
containing choice, such as the following one:
multi0 (one|two|three)
[1] If9b0c0d031477ca87786aab5c269d00748e896c8
Right now, sending the following command:
(osmo-foo-bar)# multi0 th
would basically match the following vector:
multi0 three
however the resulting argv would be:
["multi0", "th"]
Moreover, sending the following command:
(osmo-foo-bar)# multi0 t
would basically match the following vectors:
multi0 two
multi0 three
because both start from 't', so the resulting argv would be:
["multi0", "t"]
which is ambiguous!
The expected output is:
(osmo-foo-bar)# multi0 th
ok argc=1 three
(osmo-foo-bar)# multi0 t
% Ambiguous command.
This is going to be fixed in the follow up patches.
Change-Id: I83c3aef813173952641035862c534ef16384780e
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Change-Id: Iafd911dd55691b3715391e3899cd6971245c8d7f
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Change-Id: Ie07b2e8bc2f9628904e88448b4ee63b359655123
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The documentation of gsm48_decode_bcd_number2() clearly states that
the output truncation is a erroneous case, so it should actually
return negative in such cases. Let's return -ENOSPC.
Change-Id: I75680f232001ba419a587fed4c24f32c70c3ad2b
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Thanks to the new unit test for BCD number encoding / decoding, it was
discovered that gsm48_decode_bcd_number2() does not properly handle
encoded LV if the output buffer size is equal to the original MSISDN
length + 1 (\0-terminator): one digit is lost.
For example, decoding of 15-digit long MSISDN to a buffer of size
16 (15 digits + 1 for \0) would give us only 14 digits.
The problem was that 'output_len' was being decremented before
checking the remaining buffer length and writing a digit to it.
As a result, the maximum length was always one byte shorter.
Change-Id: I61d49387fedbf7b238e21540a5eff22f6861e27a
Fixes: OS#4025
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So far, both gsm48_encode_bcd_number() and gsm48_decode_bcd_number2()
did not have any unit test coverage. Let's fill this gap by testing
the following scenarios:
- encoding / decoding of a regular 9-digit MSISDN;
- encoding / decoding of a MSISDN with optional LHV;
- encoding / decoding of a long 15-digit MSISDN;
- encoding / decoding of a MSISDN to a buffer:
- with exactly matching size,
- with lower size (truncation);
- decoding LV buffer with incorrect length,
- encoding / decoding an empty input buffer.
As it turns out, gsm48_decode_bcd_number2() does not properly
handle encoded LV if the output buffer size is equal to the
original MSISDN length + 1 (\0-terminator): one digit is lost.
For example, decoding of 15-digit long MSISDN to a buffer of size
16 (15 digits + 1 for \0) would give us only 14 digits. This is
reflected in the unit test output:
Decoding HEX (buffer limit=16) '0821436587092143f5'...
Expected: (rc=0) '123456789012345'
Actual: (rc=0) '12345678901234'
Moreover, if the output buffer is shorter than decoded number,
gsm48_decode_bcd_number2() silently truncates it and returns 0,
while its description states, that the rc should reflect this.
To be fixed in the follow-up patches.
Change-Id: I4b2c330cf8ffe4427c0bee7d5f3b74be56ecd85d
Related: OS#4025
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libosmo{core,gsm,vty} code is GPLv2+. The OAP code originated in
osmo-msc.git and was moved here without changing the license. That
was a mistake, it always was meant to be under GPLv2-or-later after
moving to libosmocore.git.
Copyright is with sysmocom, so I as the managing director can
approve the license change.
Change-Id: I08311fa8214c15f8df8945b9894226608cf96f15
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So far, the TLV code contained two types of functions
* tlp_parse() to parse all TLVs according to definition into tlvp_parsed
* various helper functions to encode individual TLVs during message
generation
This patch implements the inverse of tlv_parse(): tlv_encode(), which
takes a full 'struct tlv_pared' and encodes all IEs found in it. The
order of IEs is in numerically ascending order of the tag.
As many protocols have different IE/TLV ordering requirements, let's add
a tlv_encode_ordered() function where the caller can specify the TLV
ordering during the one-shot encode.
Change-Id: I761a30bf20355a9f80a4a8e0c60b0b0f78515efe
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Change-Id: Id2462c4866bd22bc2338c9c8f69b775f88ae7511
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Based on a draft created by Neels, which is the result of reading a MAP
trace of two MSCs negotiating inter-MSC handovers, and of reading the
TS 29.002, TS 29.010 and related specs:
https://lists.osmocom.org/pipermail/openbsc/2019-January/012653.html
I figured out that the "Handover Number" mentioned in the specifications
is the same as the MSISDN IE that we already have, so we can use that
instead of creating a new IE (example usage in tests/gsup/gsup_test.c).
Create a new OSMO_GSUP_MSGT_E_ROUTING_ERROR message type, which the GSUP
server uses to tell a client that its message could not be forwarded to
the destination (see [1]). MAP has no related message.
[1]: Change-Id: Ia4f345abc877baaf0a8f73b8988e6514d9589bf5 (osmo-hlr.git)
Related: OS#3774
Change-Id: Ic00b0601eacff6d72927cea51767801142ee75db
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osmo-msc and osmo-hlr have distinct subsystems handling incoming GSUP messages.
So far we decide entirely by message type which code path should handle a GSUP
message. Thus no GSUP message type may be re-used across subsystems.
If we add a GSUP message to indicate a routing error, it would have to be a
distinct message type for subscriber management, another one for SMS, another
one for USSD...
To allow introducing common message types, introduce a GSUP Message Class IE.
In the presence of this IE, GSUP handlers can trivially direct a received
message to the right code path. If it is missing, handlers can fall back to the
previous switch(message_type) method.
Change-Id: Ic397a9f2c4a7224e47cab944c72e75ca5592efef
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To be able to append an escaped or quoted string using
OSMO_STRBUF_APPEND_NOLEN(), the function signature must have the buf and len as
first args, like most other *_buf() functions.
Add osmo_escape_str_buf2() and osmo_quote_str_buf2() to match this signature.
A recent patch [1] has changed the return value of osmo_escape_str_buf() to
char*, removing the const. However, the functions may return const strings,
hence re-add the const. The new signatures always return the non-const buffer.
To avoid code duplication, implement osmo_quote_str_buf() and
osmo_escape_str_buf() by calling the new functions.
I decided to allow slight changes to the behavior for current osmo_escape_str()
and osmo_escape_str_buf(), because impact on callers is minimal:
(1) The new implementation uses OSMO_STRBUF_*, and in consequence
osmo_quote_str() no longer prints an ending double quote after truncated
strings; Before, a truncated output was, sic:
"this string is trunca"
and now this becomes, sic:
"this string is truncat
I decided to not keep the old behavior because it is questionable to begin
with. It looks like the string actually ended at the truncation boundary
instead of the reason being not enough space in the output buffer.
(2) The new osmo_escape_str_buf2() function obviously cannot pass-thru an
unchanged char* if no escaping was needed. Sacrifice this tiny optimization
feature to avoid code duplication:
- it is an unnoticeable optimization,
- the caller anyway always passes a string buffer,
- the feature caused handling strings and buffers differently depending on
their content (i.e. code that usually writes out strings in full length
"suddenly" truncates because a non-printable character is contained, etc.)
I considered adding a skip_if_unescaped flag to the osmo_quote_str_buf2()
function signature, but in the end decided that the API clutter is not worth
having for all the above reasons.
Adjust tests to accomodate above changes.
[1] 4a62eda225ab7f3c9556990c81a6fc5e19b5eec8
Ibf85f79e93244f53b2684ff6f1095c5b41203e05
Change-Id: Id748b906b0083b1f1887f2be7a53cae705a8a9ae
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In OSMO_STRBUF_APPEND, use local variable names that are less likely to shadow
other local variables: prefix with _sb_.
In OSMO_STRBUF_APPEND, add a check to add to .pos only if it is not NULL.
Add OSMO_STRBUF_APPEND_NOLEN(), which works for function signatures that don't
return a length. This is useful for any osmo_*_buf() string writing functions,
so that these write directly to the strbuf.
Change-Id: I108cadf72deb3a3bcab9a07e50572d9da1ab0359
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Move from a static implementation in tdef_vty.c to utils.c, I also want to use
this in osmo-msc.
The point is that the telnet VTY allows unambiguous partly matches of keyword
args. For example, if I have a command definition of:
compare (apples|oranges)
then it is perfectly legal as for the vty parser to write only
compare app
One could expect the VTY to then pass the unambiguous match of "apples" to the
parsing function, but that is not the case.
Hence a VTY function implementation is faced with parsing a keyword of "app"
instead of the expected "apples".
This is actually a very widespread bug in our VTY implementations, which assume
that exactly one full keyword will always be found. I am now writing new
commands in a way that are able to manage only the starts of keywords.
Arguably, strstr(a, b) == a does the same thing, but it searches the entire
string unnecessarily.
Change-Id: Ib2ffb0e9a870dd52e081c7e66d8818057d159513
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A separate ST_DESTROYING state originally helped with certain deallocation
scenarios. But now that fsm.c avoids re-entering osmo_fsm_inst_term() twice and
gracefully handles FSM instance deallocations for termination cascades, it is
actually just as safe without a separate ST_DESTROYING state. ST_DESTROYING was
used to flag deallocation and prevent entering osmo_fsm_inst_term() twice,
which works only in a very limited range of scenarios.
Remove ST_DESTROYING from fsm_dealloc_test.c to show that all tested scenarios
still clean up gracefully.
Change-Id: I05354e6cad9b82ba474fa50ffd41d481b3c697b4
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Add global flag osmo_fsm_term_safely() -- if set to true, enable the following
behavior:
Detect osmo_fsm_inst_term() occuring within osmo_fsm_inst_term():
- collect deallocations until the outermost osmo_fsm_inst_term() is done.
- call osmo_fsm_inst_free() *after* dispatching the parent event.
If a struct osmo_fsm_inst enters osmo_fsm_inst_term() while another is already
within osmo_fsm_inst_term(), do not directly deallocate it, but talloc-reparent
it to a separate talloc context, to be deallocated with the outermost FSM inst.
The effect is that all osmo_fsm_inst freed within an osmo_fsm_inst_term()
cascade will stay allocated until all osmo_fsm_inst_term() are complete and all
of them will be deallocated at the same time.
Mark the deferred deallocation state as __thread in an attempt to make cascaded
deallocation handling threadsafe. Keep the enable/disable flag separate, so
that it is global and not per-thread.
The feature is showcased by fsm_dealloc_test.c: with this feature, all of those
wild deallocation scenarios succeed.
Make fsm_dealloc_test a normal regression test in testsuite.at.
Rationale:
It is difficult to gracefully handle deallocations of groups of FSM instances
that reference each other. As soon as one child dispatching a cleanup event
causes its parent to deallocate before fsm.c was ready for it, deallocation
will hit a use-after-free. Before this patch, by using parent_term events and
distinct "terminating" FSM states, parent/child FSMs can be taught to wait for
all children to deallocate before deallocating the parent. But as soon as a
non-child / non-parent FSM instance is involved, or actually any other
cleanup() action that triggers parent FSMs or parent talloc contexts to become
unused, it is near impossible to think of all possible deallocation events
ricocheting, and to avoid running into freeing FSM instances that were still in
the middle of osmo_fsm_inst_term(), or FSM instances to enter
osmo_fsm_inst_term() more than once. This patch makes deallocation of "all
possible" setups of complex cross referencing FSM instances easy to handle
correctly, without running into use-after-free or double free situations, and,
notably, without changing calling code.
Change-Id: I8eda67540a1cd444491beb7856b9fcd0a3143b18
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To prevent re-entering osmo_fsm_inst_term() twice for the same osmo_fsm_inst,
add flag osmo_fsm_inst.proc.terminating. osmo_fsm_inst_term() sets this to
true, or exits if it already is true.
Update fsm_dealloc_test.err for illustration. It is not relevant for unit
testing yet, just showing the difference.
Change-Id: I0c02d76a86f90c49e0eae2f85db64704c96a7674
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Despite efforts to properly handle "GONE" events and entering a ST_DESTROYING
only once, so far this test runs straight into a heap use-after-free. With
current fsm.c, it is hard to resolve the situation with the objects named
"other" also causing deallocations besides the FSM instance parent/child
relations.
For illustration, add an "expected" test output file fsm_dealloc_test.err,
making this pass will follow in a subsequent patch.
Change-Id: If801907c541bca9f524c9e5fd22ac280ca16979a
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Provide a common implementation of use counting that supports naming each user
as well as counting more than just one use per user, depending on the rules the
caller implies.
In osmo-msc, we were originally using a simple int counter to see whether a
connection is still in use or should be discarded. For clarity, we later added
names to each user in the form of a bitmask of flags, to figure out exactly
which users are still active: for logging and to debug double get / double put
bugs. This however is still not adequate, since there may be more than one CM
Service Request pending. Also, it is a specialized implementation that is not
re-usable.
With this generalized implementation, we can:
- fix the problem of inadequate counting of multiple concurrent CM Service
Requests (more than one use count per user category),
- directly use arbitrary names for uses like __func__ or "foo" (no need to
define enums and value_string[]s),
- re-use the same code for e.g. vlr_subscr and get fairly detailed VLR
susbscriber usage logging for free.
Change-Id: Ife31e6798b4e728a23913179e346552a7dd338c0
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For handling RTP IP addresses and ports, osmo-mgw, osmo-bsc and osmo-msc
so far have their own separate shims and code duplication around
inet_ntoa(), htons(), sockaddr conversions etc. Unify and standardize
with this common API.
In the MGW endpoint FSM that was introduced in osmo-bsc and which I
would like to re-use for osmo-msc (upcoming patch moving that to
osmo-mgw), it has turned out that using char* IP address and uint16_t
port number types are a convenient common denominator for logging,
MGCP message composition and GSM48. Ongoing osmo-msc work also uses this
for MNCC.
This is of course potentially useful for any other IP+port combinations
besides RTP stream handling.
Needless to say that most current implementations will probably stay
with their current own conversion code for a long time; for current
osmo-{bsc,msc,mgw} work (MGW endpoint FSM) though, I would like to move
to this API here.
Change-Id: Id617265337f09dfb6ddfe111ef5e578cd3dc9f63
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osmo_escape_str_buf() used to have the somewhat odd semantics that
if no escaping was needed, it would return the original pointer without
making any copy to the output buffer. While this seems like an elegant
optimization, it is a very strange behavior and it works differently
than all of our other *_buf() functions. Let's unify the API and
turn osmo_escape_str_buf() into a strlcpy() if no escaping is needed.
Change-Id: I3a02bdb27008a73101c2db41ac04248960ed4064
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This ensures that the rpath of the generated binaries is set to
use only the just-compiled libosmo{core,gsm,vty}.so and not any
system-wide installed libraries while avoiding the ugly shell script
wrapper.
Change-Id: I9b9ae0ed277ba71519661a66a70b7f86971e4511
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The function gsm0808_sc_cfg_from_gsm48_mr_cfg() is used to convert a
gsm48 multirate struct into a set of S-bits (S0 to S15). However, the
conversion function currently does not take into account that bit S1
actually stands for four rates at once (Config-NB-Code = 1). Lets make
sure that S1 is only set when the multirate configuration permits all
four required rates.
Change-Id: I6ad531d4e70c2252e32e2bbaca8e14a7ec6d9840
Related: SYS#4470
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The function gsm0808_sc_cfg_from_gsm48_mr_cfg() takes an S15 to S0
bitmask and converts that bitmask into an AMR multirate configuration
struct.
Unfortunately the current implementation implements 3GPP TS 28.062,
Table 7.11.3.1.3-2 wrongly in some aspects. Lets fix this.
- Fix wrong interpretation of the bitpatterns
- 5,15K is invalid and must never be selected
- Make sure that no more than 4 rates are selected in the active set
- Extend unit-test
Change-Id: I6fd7f4073b84093742c322752f2fd878d1071e15
Related: SYS#4470
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CGI to Cell ID: for example, for Paging, osmo-msc has a CGI for a subscriber
and needs to send out a Cell Identifier IE. Makes sense to add this conversion
here.
Cell ID to CGI: for a Layer 3 Complete, a subscriber sends the current cell in
the form of a Cell Identifier, which we store as a CGI, if necessary enriched
with the local PLMN.
Add enum with bitmask values to identify parts of a CGI, for the return value
of gsm0808_cell_id_to_cgi(). Can't use enum CELL_IDENT for that, because it
doesn't have a value for just a PLMN (and is not a bitmask).
Change-Id: Ib9af67b100c4583342a2103669732dab2e577b04
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During FSM design for osmo-msc, I noticed that the current behavior that
keep_timer=true doesn't guarantee a running timer can make FSM design a bit
complex, especially when using osmo_tdef for timeout definitions.
A desirable keep_timer=true behavior is one that keeps the previous timer
running, but starts a timer if no timer is running yet.
The simplest example is: a given state repeatedly transitions back to itself,
but wants to set a timeout only on first entering, avoiding to restart the
timeout on re-entering.
Another example is a repeated transition between two or more states, where the
first time we enter this group a timeout should start, but it should not
restart from scratch on every transition.
When using osmo_tdef timeout definitions for this, so far separate meaningless
states have to be introduced that merely set a fixed timeout.
To simplify, add osmo_fsm_inst_state_chg_keep_or_start_timer(), and use this in
osmo_tdef_fsm_inst_state_chg() when both keep_timer == true *and* T != 0.
In tdef_test.ok, the changes show that on first entering state L, the previous
T=1 is now kept with a large remaining timeout. When entering state L from O,
where no timer was running, this time L's T123 is started.
Change-Id: Id647511a4b18e0c4de0e66fb1f35dc9adb9177db
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Always call osmo_tdef_fsm_inst_state_chg(), also when no timeout is defined.
When there is no timeout defined for a state, tdef_test.c tries to be smart and
print different output. In that mess, I missed the fact that
osmo_tdef_fsm_inst_state_chg() isn't always called as it should. In the same
mess, the resulting state was never printed until the preceding patch, which
helped to hide this bug.
Change-Id: I1d953d99854422bff8eb32f051e9c6147bc836b6
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- Always print the state after a state transition.
This shows that actually state transitions are missing for states that have
no timer defined. This is a bug in tdef_test.c, to be fixed subsequently.
- Instead of total time passed since start, print the individual fake time
intervals. Omit initial useless zero fake time advance.
- Add two more state transitions, back out from and into a state that has no
timeout set.
Change-Id: Icb31af96d37741e256ff07868f3d4f5c48cdda74
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fi->T values are int, i.e. can be negative. Do not log them as unsigned, but
define a distinct timer class "Xnnnn" for negative T values: i.e. for T == -1,
print "Timeout of X1" instead of "Timeout of T4294967295".
The negative T timer number space is useful to distinguish freely invented
timers from proper 3GPP defined T numbers. So far I was using numbers like
T993210 or T9999 for invented T, but X1, X2 etc. is a better solution. This way
we can make sure to not accidentally define an invented timer number that
actually collides with a proper 3GPP specified timer number that the author was
not aware of at the time of writing.
Add OSMO_T_FMT and OSMO_T_FMT_ARGS() macros as standardized timer number print
format. Use that in fsm.c, tdef_vty.c, and adjust vty tests accordingly.
Mention the two timer classes in various API docs and VTY online-docs.
Change-Id: I3a59457623da9309fbbda235fe18fadd1636bff6
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Check return value of RACH encode/decode functions and fail test on
unexpected results.
Change-Id: I41bfa808e3c064a11152e7ce8ee77a01d38a0744
Related: OS#1854
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Add a flag that adds timeout info to osmo_fsm_inst state change logging.
To not affect unit testing, make this an opt-in feature that is disabled by
default -- mostly because osmo_fsm_inst_state_chg_keep_timer() will produce
non-deterministic logging depending on timing (logs remaining time).
Unit tests that don't verify log output and those that use fake time may also
enable this feature. Do so in fsm_test.c.
The idea is that in due course we will add osmo_fsm_log_timeouts(true) calls to
all of our production applications' main() initialization.
Change-Id: I089b81021a1a4ada1205261470da032b82d57872
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This function performs sending a NS-ALIVE PDU and starting Tns-Test,
let's use it in all places where we used to do that.
As part of this, also fix a bug where the sendto() return value (number
of bytes sent) would actually propagate up all the way to
gprs_ns_rx_reset() return value, which in turn affects the test results
on stdout.
Change-Id: I4d303117f77fabb74bbb91887b9914a81c2a084a
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Add functions to dump LCLS (without GCR) and GCR. Dumping entire struct
results in inconveniently long string hence the separate functions. Both
use talloc functions so they expect caller to take care of providing
proper allocation context and freeing memory.
Change-Id: Ic3609224c8f3282d667e75f68bc20327e36eb9e6
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Change-Id: Ie3f34b78edc91a013152742bebbd839586a787fe
Related: OS#3805
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We are using macros like thi |
