pespin has uploaded this change for review. ( https://gerrit.osmocom.org/c/osmo-ttcn3-hacks/+/34821?usp=email )
Change subject: GTPv2: Fix match of 15-digit IMSIs ......................................................................
GTPv2: Fix match of 15-digit IMSIs
15-digit IMSIs are len(imsi)=15, but decoded messages are octet-aligned, hence the hexstring in messages is len(imsi)=16, where the last hex char is a padding 'F'H.
* Make sure IMSIs stored in GTPv2_Emulation are padded to 16 digits (8 octets) to process matches easily. * Update tr_ template to transparently adapt passed hexstrings to match the octet-aligned value received from the wire.
Change-Id: Ie2f316ccb5bc69ec15e861616de4fd5babc4004e --- M library/GTPv2_Emulation.ttcn M library/GTPv2_Templates.ttcn M library/Osmocom_Types.ttcn 3 files changed, 35 insertions(+), 1 deletion(-)
git pull ssh://gerrit.osmocom.org:29418/osmo-ttcn3-hacks refs/changes/21/34821/1
diff --git a/library/GTPv2_Emulation.ttcn b/library/GTPv2_Emulation.ttcn index 571da4e..736dd03 100644 --- a/library/GTPv2_Emulation.ttcn +++ b/library/GTPv2_Emulation.ttcn @@ -602,6 +602,10 @@ };
function f_gtp2_register_imsi(hexstring imsi) runs on GTP2_ConnHdlr { + /* 15-digit IMSIs are len(imsi)=15, but decoded messages are + * octet-aligned, hence the hexstring in messages is len(imsi)=16, where + * the last hex char is a padding 'F'H */ + imsi := f_pad_bcd_number(imsi); GTP2_PROC.call(GTP2EM_register_imsi:{imsi}) { [] GTP2_PROC.getreply(GTP2EM_register_imsi:{imsi}); } diff --git a/library/GTPv2_Templates.ttcn b/library/GTPv2_Templates.ttcn index b306955..e5022d8 100644 --- a/library/GTPv2_Templates.ttcn +++ b/library/GTPv2_Templates.ttcn @@ -126,7 +126,7 @@ lengthIndicator := ?, instance := ?, spare := '0000'B, - iMSI_Value := imsi + iMSI_Value := f_pad_bcd_number_tmpl(imsi) }
template (present) MSISDN ts_GTP2C_msisdn(template (present) hexstring msisdn) := { diff --git a/library/Osmocom_Types.ttcn b/library/Osmocom_Types.ttcn index ef55583..d034a74 100644 --- a/library/Osmocom_Types.ttcn +++ b/library/Osmocom_Types.ttcn @@ -261,6 +261,18 @@ } }
+function f_pad_bcd_number_tmpl(template hexstring inp) return template hexstring { + if (istemplatekind(inp, "omit")) { + return omit; + } else if (istemplatekind(inp, "*")) { + return *; + } else if (istemplatekind(inp, "?")) { + return ?; + } else { + return f_pad_bcd_number(valueof(inp)); + } +} + /* like L1SAP_IS_PACKET_RACH */ function ra_is_ps(OCT1 ra) return boolean { if ((ra and4b 'F0'O == '70'O) and (ra and4b '0F'O != '0F'O)) {
-
pespin