Allow to set a different ARFCN
Add the -f option to use a different channel. This is done
by patching the various tables before the OML and RSL is brought
up. It looks like it is working...
Patch by Harald, moving of the patch_tables invocation by zecke
diff --git a/src/bsc_hack.c b/src/bsc_hack.c
index 2e559c0..2c6d164 100644
--- a/src/bsc_hack.c
+++ b/src/bsc_hack.c
@@ -51,6 +51,7 @@
/* MCC and MNC for the Location Area Identifier */
static int MCC = 1;
static int MNC = 1;
+static int ARFCN = HARDCODED_ARFCN;
static const char *database_name = "hlr.sqlite3";
/* The following definitions are for OM and NM packets that we cannot yet
@@ -603,6 +604,8 @@
*/
static void patch_tables(struct gsm_bts *bts)
{
+ u_int8_t arfcn_low = ARFCN & 0xff;
+ u_int8_t arfcn_high = (ARFCN >> 8) & 0x0f;
/* covert the raw packet to the struct */
struct gsm48_system_information_type_3 *type_3 =
(struct gsm48_system_information_type_3*)&si3;
@@ -619,13 +622,25 @@
type_3->lai = lai;
type_4->lai = lai;
type_6->lai = lai;
+
+ /* patch ARFCN */
+ msg_2[74] &= 0xf0;
+ msg_2[74] |= arfcn_high;
+ msg_2[75] = arfcn_low;
+
+ msg_6[7] &= 0xf0;
+ msg_6[7] |= arfcn_high;
+ msg_6[8] = arfcn_low;
+
+ type_4->data[2] &= 0xf0;
+ type_4->data[2] |= arfcn_high;
+ type_4->data[3] = arfcn_low;
}
static void bootstrap_rsl(struct gsm_bts *bts)
{
fprintf(stdout, "bootstrapping RSL MCC=%u MNC=%u\n", MCC, MNC);
- patch_tables(bts);
set_system_infos(bts);
}
@@ -657,7 +672,8 @@
gsmnet->name_long = "25C3 GSM";
bts = &gsmnet->bts[0];
bts->location_area_code = 1;
- bts->trx[0].arfcn = HARDCODED_ARFCN;
+ bts->trx[0].arfcn = ARFCN;
+ patch_tables(bts);
telnet_init(gsmnet, 4242);
if (mi_setup(bts, 0, mi_cb) < 0)
@@ -692,6 +708,7 @@
printf(" -s --disable-color\n");
printf(" -n --network-code number(MNC) \n");
printf(" -c --country-code number (MCC) \n");
+ printf(" -f --arfcn number The frequency ARFCN\n");
printf(" -l --database db-name The database to use\n");
printf(" -a --authorize-everyone Allow everyone into the network.\n");
printf(" -r --reject-cause number The reject cause for LOCATION UPDATING REJECT.\n");
@@ -713,10 +730,11 @@
{"authorize-everyone", 0, 0, 'a'},
{"reject-cause", 1, 0, 'r'},
{"pcap", 1, 0, 'p'},
+ {"arfcn", 1, 0, 'f'},
{0, 0, 0, 0}
};
- c = getopt_long(argc, argv, "hc:n:d:sar:p:",
+ c = getopt_long(argc, argv, "hc:n:d:sar:p:f:",
long_options, &option_index);
if (c == -1)
break;
@@ -738,6 +756,9 @@
case 'c':
MCC = atoi(optarg);
break;
+ case 'f':
+ ARFCN = atoi(optarg);
+ break;
case 'l':
database_name = strdup(optarg);
break;