- OpenBSC - lists.osmocom.org

Camp preparation and pySim
by Holger Hans Peter Freyther 29 Jul '11

29 Jul '11

Hi Sylvain, do we need such a hack on top of the 27c3 branch for the upcoming camp? I will try to create a proper patch before the start of the camp. holger

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nanoBTS + external Antennas + Repeater
by Lennart Müller 27 Jul '11

27 Jul '11

Good morning, I would like to use two directional antennas with a nanoBTS DCS1800. As far as I know, first I need a duplexer to use one antenna both for RX and TX - does anybody know a cheap model? I found only one for 500 Euros. Second, to connect two antennas to the duplexer, I need a power splitter. Can somebody suggest one for duplex usage? Third, to improve indoor signal level, there are plenty offers of duplex repeaters, but the legal situation is unclear because one might produce distortion on ARFCNs different from his own. Again, anyone with experience? Maybe a suggestion for a model with a fixed ARFCN setting? Thanks, Lennart

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sms bugfix
by Dennis Wehrle 25 Jul '11

25 Jul '11

Hello Our goal was to send status sms via the vty interface. But all of our sms were cropped. In contrast sms from one MS to another MS are displayed correctly (despite the fact, that the text at the database contains several '@' at the end / the user_data contains several zero-octets). Therefore i have inspect the code and found several bugs. The main problem is that the "user_data_len" is not correctly used. As per GSM 03.40, 9.2.3.16 TP‑User‑Data‑Length (TP‑UDL): "If the TP‑User‑Data is coded using the GSM 7 bit default alphabet, the TP‑User‑Data‑Length field gives an integer representation of the number of septets within the TP‑User‑Data field to follow." Currently the "user_data_len" contains the number of octets (returned from gsm_7bit_encode(...) at gsm_utils.c (libosmocore)). The big problem here is that this information is not unique, e.g.: 1.) 46 non-extension characters + 1 extension character => (46 * 7 bit + (1 * (2 * 7 bit))) / 8 bit = 42 octets 2.) 47 non-extension characters => (47 * 7 bit) / 8 bit = 41,125 = 42 octets 3.) 48 non-extension characters => (48 * 7 bit) / 8 bit = 42 octects But the MS has to know the correct "user_data_len" to decode the correct number of characters. For this reason i updated the gsm_7bit_encode() function to return the correct number of septets. However sometimes it is needed to know the correct number of octets (e.g. at gsm_04_11.c: gsm340_gen_tpdu(...)) => i added a function to gsm_utils.c named: uint8_t get_octet_len(const uint8_t sept_len) I have also fixed the problem, that the sms are wrongly stored / displayed on the database. But the solution on the function *sms_from_result(...) (at db.c) is not really "beautiful". This is because there exists no "user_data_len" field at the database. To store the right value for "user_data_len" (which is further needed) i have to get the length from the "text" field. Unfortunately this is not enough. If the text contains extension characters like {[]} etc. then the "user_data_len" has to be bigger because these characters needs two septets. Therefore i use a switch statement so search for these characters. A better solution for that is to store the right "user_data_len" to the database (on the encoding / decoding procedure). But i don't know if this is a suitable solution for all of you (because you have to change your database structure etc.). Best Regards Dennis Wehrle

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[PATCH] sms: Kill the text field, fix the size and truncation
by Holger Hans Peter Freyther 24 Jul '11

24 Jul '11

Patches from Dennis Wehrle, fix the truncation of SMS from the VTY --- openbsc/src/libmsc/db.c | 34 +++++++++++++++------------------- openbsc/src/libmsc/gsm_04_11.c | 2 +- openbsc/src/libmsc/gsm_04_80.c | 4 +++- 3 files changed, 19 insertions(+), 21 deletions(-) diff --git a/openbsc/src/libmsc/db.c b/openbsc/src/libmsc/db.c index 53675f7..d1dd749 100644 --- a/openbsc/src/libmsc/db.c +++ b/openbsc/src/libmsc/db.c @@ -51,7 +51,7 @@ static char *create_stmts[] = { "INSERT OR IGNORE INTO Meta " "(key, value) " "VALUES " - "('revision', '2')", + "('revision', '3')", "CREATE TABLE IF NOT EXISTS Subscriber (" "id INTEGER PRIMARY KEY AUTOINCREMENT, " "created TIMESTAMP NOT NULL, " @@ -108,9 +108,7 @@ static char *create_stmts[] = { "ud_hdr_ind INTEGER NOT NULL, " "dest_addr TEXT, " "user_data BLOB, " /* TP-UD */ - /* additional data, interpreted from SMS */ - "header BLOB, " /* UD Header */ - "text TEXT " /* decoded UD after UDH */ + "ud_length INTEGER NOT NULL " ")", "CREATE TABLE IF NOT EXISTS VLR (" "id INTEGER PRIMARY KEY AUTOINCREMENT, " @@ -177,7 +175,7 @@ static int check_db_revision(void) return -EINVAL; } rev = dbi_result_get_string(result, "value"); - if (!rev || atoi(rev) != 2) { + if (!rev || atoi(rev) != 3) { dbi_result_free(result); return -EINVAL; } @@ -990,15 +988,16 @@ int db_subscriber_assoc_imei(struct gsm_subscriber *subscriber, char imei[GSM_IM int db_sms_store(struct gsm_sms *sms) { dbi_result result; - char *q_text, *q_daddr; + char *q_daddr; unsigned char *q_udata; char *validity_timestamp = "2222-2-2"; + uint8_t octet_len = 0; /* FIXME: generate validity timestamp based on validity_minutes */ - dbi_conn_quote_string_copy(conn, (char *)sms->text, &q_text); dbi_conn_quote_string_copy(conn, (char *)sms->dest_addr, &q_daddr); - dbi_conn_quote_binary_copy(conn, sms->user_data, sms->user_data_len, + octet_len = gsm_get_octet_len(sms->user_data_len); + dbi_conn_quote_binary_copy(conn, sms->user_data, octet_len, &q_udata); /* FIXME: correct validity period */ result = dbi_conn_queryf(conn, @@ -1006,15 +1005,14 @@ int db_sms_store(struct gsm_sms *sms) "(created, sender_id, receiver_id, valid_until, " "reply_path_req, status_rep_req, protocol_id, " "data_coding_scheme, ud_hdr_ind, dest_addr, " - "user_data, text) VALUES " + "user_data, ud_length) VALUES " "(datetime('now'), %llu, %llu, %u, " - "%u, %u, %u, %u, %u, %s, %s, %s)", + "%u, %u, %u, %u, %u, %s, %s, %u)", sms->sender->id, sms->receiver ? sms->receiver->id : 0, validity_timestamp, sms->reply_path_req, sms->status_rep_req, sms->protocol_id, sms->data_coding_scheme, sms->ud_hdr_ind, - q_daddr, q_udata, q_text); - free(q_text); + q_daddr, q_udata, sms->user_data_len); free(q_daddr); free(q_udata); @@ -1029,8 +1027,9 @@ static struct gsm_sms *sms_from_result(struct gsm_network *net, dbi_result resul { struct gsm_sms *sms = sms_alloc(); long long unsigned int sender_id, receiver_id; - const char *text, *daddr; + const char *daddr; const unsigned char *user_data; + int octet_len; if (!sms) return NULL; @@ -1059,17 +1058,14 @@ static struct gsm_sms *sms_from_result(struct gsm_network *net, dbi_result resul sms->dest_addr[sizeof(sms->dest_addr)-1] = '\0'; } - sms->user_data_len = dbi_result_get_field_length(result, "user_data"); + sms->user_data_len = dbi_result_get_uint(result, "ud_length"); user_data = dbi_result_get_binary(result, "user_data"); + if (sms->user_data_len > sizeof(sms->user_data)) sms->user_data_len = (uint8_t) sizeof(sms->user_data); + octet_len = gsm_get_octet_len(sms->user_data_len); memcpy(sms->user_data, user_data, sms->user_data_len); - text = dbi_result_get_string(result, "text"); - if (text) { - strncpy(sms->text, text, sizeof(sms->text)); - sms->text[sizeof(sms->text)-1] = '\0'; - } return sms; } diff --git a/openbsc/src/libmsc/gsm_04_11.c b/openbsc/src/libmsc/gsm_04_11.c index ee7f577..ad3b300 100644 --- a/openbsc/src/libmsc/gsm_04_11.c +++ b/openbsc/src/libmsc/gsm_04_11.c @@ -628,7 +628,7 @@ static int gsm340_rx_tpdu(struct gsm_subscriber_connection *conn, struct msgb *m switch (sms_alphabet) { case DCS_7BIT_DEFAULT: - gsm_7bit_decode(gsms->text, smsp, gsms->user_data_len); + gsm_7bit_decode_hdr(gsms->text, smsp, gsms->user_data_len, gsms->ud_hdr_ind); break; case DCS_8BIT_DATA: case DCS_UCS2: diff --git a/openbsc/src/libmsc/gsm_04_80.c b/openbsc/src/libmsc/gsm_04_80.c index 39738a5..c7dad43 100644 --- a/openbsc/src/libmsc/gsm_04_80.c +++ b/openbsc/src/libmsc/gsm_04_80.c @@ -68,12 +68,14 @@ int gsm0480_send_ussd_response(struct gsm_subscriber_connection *conn, struct msgb *msg = gsm48_msgb_alloc(); struct gsm48_hdr *gh; uint8_t *ptr8; + uint8_t octet_len; int response_len; /* First put the payload text into the message */ ptr8 = msgb_put(msg, 0); response_len = gsm_7bit_encode(ptr8, response_text); - msgb_put(msg, response_len); + octet_len = gsm_get_octet_len(response_len); + msgb_put(msg, octet_len); /* Then wrap it as an Octet String */ msgb_wrap_with_TL(msg, ASN1_OCTET_STRING_TAG); -- 1.7.4.1 --------------090106040904000308080203--

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Fwd: Radios
by Barnaby Astles 24 Jul '11

24 Jul '11

Forgot the list >.< Barnaby J Astles ---------- Forwarded message ---------- From: Barnaby Astles <bjastles(a)gmail.com> Date: Sun, Jul 24, 2011 at 11:16 Subject: Re: Radios To: Harald Welte <laforge(a)gnumonks.org> Yes Think you are right ... I am just horrified at the cost of the ip.access. I would like to get in to the project but the cost of entry is just so enormous. All I can do is research and hope to land on some sort of deal. Then I would try to get a low powered temp licence and the make the case for a low powered non-interference license to Industry Canada to deploy low cost building/campus zones. I am kind of sick to see all the spectrum get eaten up by the large corps and leave nothing for small companies. Barnaby J Astles On Sun, Jul 24, 2011 at 02:52, Harald Welte <laforge(a)gnumonks.org> wrote: > Hi Barnaby, > > On Sat, Jul 23, 2011 at 01:15:49PM -0400, Barnaby Astles wrote: > > Has any one looked at airspan radios ? > > I am not aware of anyone in our community having had access to those > devices. > > > http://www.airspan.com/products/airharmony/ > > it's hard to judge how easily they would integrate with OpenBSC based on > the marketing speech says ;) > > I would guess that it should be fairly simple to integrate the GSM part, > if it reuses the Abis related components from ip.access. > > However, they could just use some completely different parts of the > ip.access software stack, and have something custom over the back-haul > link. > > If you have an interest in OpenBSC interoperability with those units, > I'm sure we could find a way to make it happen. My guess is that > they would be pretty expensive, as the nanoBTS alone (without any LTE) > is already horribly expensive. > > Regards, > Harald > -- > - Harald Welte <laforge(a)gnumonks.org> > http://laforge.gnumonks.org/ > > ============================================================================ > "Privacy in residential applications is a desirable marketing option." > (ETSI EN 300 175-7 Ch. A6) > >

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Radios
by Barnaby Astles 24 Jul '11

24 Jul '11

Has any one looked at airspan radios ? Specifically this one: http://www.airspan.com/products/airharmony/ Barnaby J Astles

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Current OpenBSC + LCR using MNCC socket
by Lennart Müller 23 Jul '11

23 Jul '11

Hello, since some days I'm using an old version of OpenBSC and LCR (as suggested by University of Freiburg) to interconnect our GSM and PSTN. We are using Debian squeeze and a nanoBTS. However, I would like to upgrade to a newer version of OpenBSC. Unfortunately, no current LCR version compiles without errors such as missing declarations etc., for example: g++ -DHAVE_CONFIG_H -I. -DWITH_GSM_BS -I./openbsc/include -I./libosmocore/include -I./openbsc -Wall -DCONFIG_DATA="\"/usr/local/lcr\"" -DSHARE_DATA="\"/usr/local/lcr\"" -DLOG_DIR="\"/usr/local/lcr\"" -DEXTENSION_DATA="\"/usr/local/lcr/extensions\"" -g -O2 -MT gsm.o -MD -MP -MF .deps/gsm.Tpo -c -o gsm.o gsm.cpp In file included from ./openbsc/include/openbsc/rest_octets.h:4, from ./openbsc/include/openbsc/gsm_data.h:9, from gsm_bs.h:2, from main.h:157, from gsm.cpp:12: ./openbsc/include/openbsc/gsm_04_08.h:33: error: use of enum ‘gsm_chan_t’ without previous declaration ./openbsc/include/openbsc/gsm_04_08.h:33: error: invalid type in declaration before ‘;’ token ./openbsc/include/openbsc/gsm_04_08.h:34: error: use of enum ‘gsm_chreq_reason_t’ without previous declaration ./openbsc/include/openbsc/gsm_04_08.h:34: error: invalid type in declaration before ‘;’ token In file included from ./openbsc/include/openbsc/gsm_data_shared.h:11, from ./openbsc/include/openbsc/gsm_data.h:154, from gsm_bs.h:2, from main.h:157, from gsm.cpp:12: ./libosmocore/include/osmocom/gsm/gsm_utils.h:62: error: expected identifier before ‘)’ token ./libosmocore/include/osmocom/gsm/gsm_utils.h:62: error: two or more data types in declaration of ‘parameter’ gsm.cpp: In function ‘gsm_mncc* create_mncc(int, unsigned int)’: gsm.cpp:195: error: invalid application of ‘sizeof’ to incomplete type ‘gsm_mncc’ etc. etc. If I manually include some header files from libosmocore and OpenBSC to LCR and declare missing ENUMs (dirty hacks), LCR starts without a problem. Starting osmo-nitb with -P and -m parameters, LCR can connect to MNCC socket. But any try to start voice traffic either from or to a mobile station results into these continuous messages: <0006> gsm_04_08.c:2954 receive message GSM_TCH_FRAME <0006> gsm_04_08.c:2986 TCH frame to lchan without RTP connection <0006> gsm_04_08.c:2954 receive message GSM_TCH_FRAME <0006> gsm_04_08.c:2986 TCH frame to lchan without RTP connection <0006> gsm_04_08.c:2954 receive message GSM_TCH_FRAME <0006> gsm_04_08.c:2986 TCH frame to lchan without RTP connection ..... Furthermore, either OpenBSC ignores LCR messages or LCR does not send messages to OpenBSC, because calls from mobile stations are signalled through LCR to asterisk; calls from asterisk to a mobile station are indicated by LCR but not by OpenBSC. All configuration files of the running setup (openbsc.cfg, LCR files) are used. Commits... - LCR: 39a36cb99a6dba1441a7a4b51914e0dadf3a7ae8 - libosmocore: 95f7eb288c4b8b69d61fa8d68957fb21f09e11e5 - OpenBSC: fe2d9b2fab2ae36a12411435f910efc9697d7b18 (debian branch, but same problem with master) Is there really no possibility at the moment to run LCR with a current OpenBSC? Many thanks in advance, Lennart

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Bounce action notification
by mailman＠lists.osmocom.org 23 Jul '11

23 Jul '11

This is a Mailman mailing list bounce action notice: List: OpenBSC Member: christoph_schueler(a)web.de Action: Subscription disabled. Reason: Excessive or fatal bounces. The triggering bounce notice is attached below. Questions? Contact the Mailman site administrator at mailman(a)lists.osmocom.org.

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Telecommunication and Wireless Hacking at CCC CAMP 2011
by Fabio Pietrosanti (naif) 22 Jul '11

22 Jul '11

Hi all, i just wanted to send a summary of all most cool talk that will be at CCC CAMP 2011 related to Telecommunications and Wireless Technologies hacking: Open-source 4G radio - It's time to start WiMAX and LTE hacking http://events.ccc.de/camp/2011/Fahrplan/events/4446.en.html Applied Research on security of TETRA radio - Digital radio technology beyond GSM http://events.ccc.de/camp/2011/Fahrplan/events/4496.en.html GPRS Intercept - Wardriving phone networks http://events.ccc.de/camp/2011/Fahrplan/events/4504.en.html Introduction to Satellite Communications - Installation and Operation of Satellite Systems http://events.ccc.de/camp/2011/Fahrplan/events/4442.en.html Transition Telecom - Telecommunications and networking during energy descent http://events.ccc.de/camp/2011/Fahrplan/events/4459.en.html Anyone missing to the list? -naif

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[PATCH 0/4] logrotate related patches
by Daniel Willmann 19 Jul '11

19 Jul '11

Hi, this series of patches makes sure that the logs generated by osmo_pcap_server are cleaned up. I wasn't able to use logrotate since we wanted to keep the timestamped filenames and logrotate would treat every log as independent. The script now sorts the pcap logs per-client and deletes all but the newest N files. The oldest M remaining files will be compressed with gzip. Some small fixes for problems I encountered are included. I hope the requirement for libosmocore 0.3.2 is okay. Regards, Daniel Willmann (4): server: Fix memory leak and error handling in restart_pcap server: Register signal handler to reopen logfiles on SIGHUP Catch up with API change in osmo_sock_init contrib: Add a script to clean up in regular intervals Makefile.am | 2 +- configure.ac | 3 +- contrib/Makefile.am | 1 + contrib/clean_old | 46 ++++++++++++++++++++++++++++++++++ include/osmo-pcap/osmo_pcap_server.h | 2 + src/osmo_client_network.c | 2 +- src/osmo_server_main.c | 4 +++ src/osmo_server_network.c | 31 +++++++++++++++++++++- 8 files changed, 86 insertions(+), 5 deletions(-) create mode 100644 contrib/Makefile.am create mode 100755 contrib/clean_old -- 1.7.5.3

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