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Move the regexp parsing code from the NAT to libcommon as it will
be used by the NAT and BSC code. This also adds the #include <regex.h>
include to gsm_data. This header should be split up.
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Match the used SMSC and the destination of the SMS and change
the SMSC address if both are matched.
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Use the same filtering infrasturcture to patch the SMSC
address in a CP-DATA/RP-DATA message. Add a very simple
testcase for this code.
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Refactor the code to allow having different handlers. The goal
is to be able to patch some SMS messages too.
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The idea that MCC and MNC is enough to classify a subscriber
turns out to be wrong. Certain operatos license a number range
of IMSIs to others. When we see a '^' in the MCC field we treat
it as a regexp. The code now turns the MCC/MNC into a regexp
for the IMSI. It is not using extended POSIX regexp to match
the behavior of the access list.
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Use the libosmocore code to ignore certain signals by
default (e.g. SIGHUP, SIGPIPE) and use the new code to
create a default stderr logging target and initialize
it properly.
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Summary of changes:
s/msg_entry_parse/osmo_config_list_parse/g
s/msg_entry/osmo_config_entry/g
s/msg_entries/osmo_config_list/g
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Summary of changes:
s/bcd2char/osmo_bcd2char/g
s/char2bcd/osmo_char2bcd/g
s/hexparse/osmo_hexparse/g
s/hexdump/osmo_hexdump/g
s/hexdump_nospc/osmo_hexdump_nospc/g
s/ubit_dump/osmo_ubit_dump/g
s/static_assert/osmo_static_assert/g
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The current code tries to find _one_ bsc for a paging message
and then continues. The new code will try to find multiple BSCs
for each LAC. This is done in preparation of having two BSCs
handle the same LAC. This code right now is O(m*n) but it will
be worse once paging groups are landed.
The code to test the function was reduced to just test the lac
lookup code as the other part can not be tested in a standalone
setup anymore.
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If the regexp fails to compile the internal dfa is NULL and a
regexec will crash nicely. Fail and free the string if the regexp
fails to compile.
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In 136f453dd2492b95004461a33c90b11732f33bd8, I forgot to update
the new header path in the test/bsc-nat files (this happened to
me because I forgot to configured openBSC without --enable-nat).
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We want to support real trunks in the MGCP code and we need to
have some better book keeping for those. Move the code around.
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This code allocates endpoints from multiple multiplexes but
will always leave 0x0 and 0x1f unassigned in the multiplex.
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On a classic BSC we have 32 channels but one is reserved for
signalling. Make sure that we are not assigning 0x1f as we
assume that this is the signalling channel. This means that
from 32 possible voice channels we are only going to use 30
as we are already not using the 0x0.
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Allocate the status for an endpoint dynamically. We will support
BSCs with different amount of multiplexes and need to have this
flexibility in the future. Add the proper null checks to the
current users of this code.
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We now need to have access to a mgcp_cfg and the change to the
setup number patching needs new data. We now set the number to
international type.
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bsc_init.c was a big mess even only for two supported BTS models,
so before adding more BTS types, this needs a cleanup.
All the BTS specific code from bsc_init.c has now moved into
bts_{siemens_bs11,ipaccess_nanobts}.c
This has required that input_event() and nm_state_event() get both
converted to proper libosmocore signals instead of referencing external
symbols.
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The reason for this is quite simple: We want to make sure anyone
running a customized version of OpenBSC to operate a network will
have to release all custom modifiations to the source code.
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Add the test case for matching '*' and for not matching at all
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Extract the IMSI from the first message as well and safe it
in the connection structure. The problem is that we do not
have this structure at this point, so we will allocate the
imsi as child of the bsc_connection and then move/steal it.
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Currently it is not is not easily possible to disable
everyone and then only allow certain SIMs. By changing
the order we can do:
access-list imsi-deny only-something ^[0-9]*$
access-list imsi-allow only-something ^123[0-9]*$
and still keep the usecase of only forbidding certain
SIMs on certain LACs. Adjust test case, test that the
other cases are still functional.
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Make it possible that one BSC is serving multiple
cells. Introduce a list of lacs, add functions to
manipulate the lists. The current test cases for
paging by lac continue to work.
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The 0x1 inside a CIC IE could indicate a new IE... add test data
and test case to verify that the patching works correctly.
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Add a test case and also add a basic check that we got some
size checks correct. The next step is to act on the result.
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A test case with a TMSI is missing, this would be needed for
better coverage of the filter test case.
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Add code to replace the Endpoint number for the mgcp.
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Do attempt to not reassign an endpoint immediately but go
to the next free one.
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We are going to have more than one trunk, so all code hardcoding the
multiplex to zero must go. Avoid this kind of problem by saving the
MGCP endpoint number and comparing that.
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common_vty.c was including bsc_nat.h which tried to
get the sccp/sccp_types.h which is not required to be
installed. Move all structs using/embedding SCCP structures
into the bsc_nat_sccp.h and include. This should fix
the compilation.
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Add --enable-nat and --enable-osmo-bsc to build applications
requiring the Osmo SCCP library to be installed. We are not
using autodiscover as this is out of fashion.
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The next step in the way to the BSC API. We have a clear a
new connection was opened signal now... and the MSC could
use it...
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Inside the access-list we have a list of entries that have
either one allow or one deny rule... we do not allow to remove
a single rule but one has to remove the whole list, in that case
talloc will handle cleaning all entries.
Right now the matching is O(n*m) as we traverse the list
(multiple times) and run the regexp multiple times. One
way to make it faster would be to concat all regexps into
one.
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One can set one access-list to one BSC and one
access-list to one NAT. The matching of IMSIs
remains the same for now, also applying the
white/blacklist. Access lists can not be deleted
for now and no perf opt is done (e.g. one could
cache the result of the last lookup in the bsc
struct).
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Right now it was not possible to just find a connection, by returning
the connection that is created we will have direct access to it. It
will be used by the local connection handling.
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The msgb needs to be around when we access the parsed structure
but that needs to be guranteed by the caller handing out the parsed
structure.
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We are analyzing each CR message and it is nice to know the
reason these connections were created. Change the nat method.
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Now we are parsing a CM Service Request, Location Updating Request
and the Paging Response. For all other messages we claim to not
support it and force a refuse.
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For now we have:
1.) bsc imsi deny to deny at the BSC level
2.) bsc imsi allow to allow a SIM at the BSC level
3.) nat imsi deny to deny at the global level
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