Change in openbsc[master]: osmo-bsc_nat: Parse MGCP Connection ID as hex

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Daniel Willmann gerrit-no-reply at lists.osmocom.org
Thu Apr 25 08:03:30 UTC 2019 

Daniel Willmann has uploaded this change for review. ( https://gerrit.osmocom.org/13778


Change subject: osmo-bsc_nat: Parse MGCP Connection ID as hex
......................................................................

osmo-bsc_nat: Parse MGCP Connection ID as hex

Our ttcn3-bscnat-tests would randomly fail. After the CRCX ACK returns
from the MSC the bsc-nat reports it could not find a CI it it and
deletes the connection on the BSC-side.

This happens because the field is parsed as a decimal value instead of
hexadecimal. So a value of 00FED122 is parsed as '0' which is a reserved
value in our program.

This fix parses the field as hexadecimal value and also logs an error if
the value happens to be 0.

make check will now test if a hexadecimal CI is parsed correctly.

Fixes: OS#3951
Change-Id: I49b8b61644bf706162102dce268cae2265536fc5
---
M openbsc/src/libmgcp/mgcp_protocol.c
M openbsc/src/osmo-bsc_nat/bsc_mgcp_utils.c
M openbsc/tests/bsc-nat/bsc_data.c
M openbsc/tests/bsc-nat/bsc_nat_test.c
4 files changed, 11 insertions(+), 8 deletions(-)



  git pull ssh://gerrit.osmocom.org:29418/openbsc refs/changes/78/13778/1

diff --git a/openbsc/src/libmgcp/mgcp_protocol.c b/openbsc/src/libmgcp/mgcp_protocol.c
index 84dbc1f..689c91f 100644
--- a/openbsc/src/libmgcp/mgcp_protocol.c
+++ b/openbsc/src/libmgcp/mgcp_protocol.c
@@ -208,7 +208,7 @@
 
 	len = snprintf(sdp_record, size,
 			"v=0\r\n"
-			"o=- %u 23 IN IP4 %s\r\n"
+			"o=- %x 23 IN IP4 %s\r\n"
 			"s=-\r\n"
 			"c=IN IP4 %s\r\n"
 			"t=0 0\r\n",
@@ -285,7 +285,7 @@
 	}
 
 	len = snprintf(sdp_record, sizeof(sdp_record),
-		       "I: %u%s\n\n", endp->ci, osmux_extension);
+		       "I: %x%s\n\n", endp->ci, osmux_extension);
 	if (len < 0)
 		return NULL;
 
@@ -512,7 +512,7 @@
 	uint32_t ci = strtoul(_ci, NULL, 10);
 
 	if (ci != endp->ci) {
-		LOGP(DMGCP, LOGL_ERROR, "ConnectionIdentifiers do not match on 0x%x. %u != %s\n",
+		LOGP(DMGCP, LOGL_ERROR, "ConnectionIdentifiers do not match on 0x%x. %x != %x\n",
 			ENDPOINT_NUMBER(endp), endp->ci, _ci);
 		return -1;
 	}
@@ -891,7 +891,7 @@
 		osmo_jibuf_set_dequeue_cb(endp->bts_jb, mgcp_dejitter_udp_send, &endp->net_end);
 	}
 
-	LOGP(DMGCP, LOGL_DEBUG, "Creating endpoint on: 0x%x CI: %u port: %u/%u\n",
+	LOGP(DMGCP, LOGL_DEBUG, "Creating endpoint on: 0x%x CI: %x port: %u/%u\n",
 		ENDPOINT_NUMBER(endp), endp->ci,
 		endp->net_end.local_port, endp->bts_end.local_port);
 	if (p->cfg->change_cb)
diff --git a/openbsc/src/osmo-bsc_nat/bsc_mgcp_utils.c b/openbsc/src/osmo-bsc_nat/bsc_mgcp_utils.c
index 311ab94..17dc659 100644
--- a/openbsc/src/osmo-bsc_nat/bsc_mgcp_utils.c
+++ b/openbsc/src/osmo-bsc_nat/bsc_mgcp_utils.c
@@ -812,11 +812,14 @@
 		return CI_UNUSED;
 	}
 
-	if (sscanf(res, "I: %u", &ci) != 1) {
+	if (sscanf(res, "I: %x", &ci) != 1) {
 		LOGP(DMGCP, LOGL_ERROR, "Failed to parse CI in msg '%s'\n", str);
 		return CI_UNUSED;
 	}
 
+	if (ci == CI_UNUSED)
+		LOGP(DMGCP, LOGL_ERROR, "CI field '%s' parsed as reserved value CI_UNUSED\n", str);
+
 	return ci;
 }
 
diff --git a/openbsc/tests/bsc-nat/bsc_data.c b/openbsc/tests/bsc-nat/bsc_data.c
index 71d5391..d29caef 100644
--- a/openbsc/tests/bsc-nat/bsc_data.c
+++ b/openbsc/tests/bsc-nat/bsc_data.c
@@ -157,8 +157,8 @@
 
 
 /* patch the ip and port */
-static const char crcx_resp[] = "200 23265295\r\nI: 1\r\n\r\nv=0\r\nc=IN IP4 172.16.18.2\r\nm=audio 4002 RTP/AVP 98 3\r\na=rtpmap:98 AMR/8000\r\n";
-static const char crcx_resp_patched[] = "200 23265295\r\nI: 1\r\n\r\nv=0\r\nc=IN IP4 10.0.0.1\r\nm=audio 999 RTP/AVP 98 3\r\na=rtpmap:98 AMR/8000\r\na=fmtp:98 mode-set=2 octet-align=1\r\n";
+static const char crcx_resp[] = "200 23265295\r\nI: 0F\r\n\r\nv=0\r\nc=IN IP4 172.16.18.2\r\nm=audio 4002 RTP/AVP 98 3\r\na=rtpmap:98 AMR/8000\r\n";
+static const char crcx_resp_patched[] = "200 23265295\r\nI: 0F\r\n\r\nv=0\r\nc=IN IP4 10.0.0.1\r\nm=audio 999 RTP/AVP 98 3\r\na=rtpmap:98 AMR/8000\r\na=fmtp:98 mode-set=2 octet-align=1\r\n";
 
 /* patch the ip and port */
 static const char mdcx[] = "MDCX 23330829 8 at mgw MGCP 1.0\r\nC: 394b0439fb\r\nI: 1\r\nL: p:20, a:AMR, nt:IN\r\nM: recvonly\r\n\r\nv=0\r\no=- 1049380491 0 IN IP4 172.16.18.2\r\ns=-\r\nc=IN IP4 172.16.18.2\r\nt=0 0\r\nm=audio 4410 RTP/AVP 126\r\na=rtpmap:126 AMR/8000/1\r\na=fmtp:126 mode-set=2  octet-align=1;start-mode=0\r\na=ptime:20\r\na=recvonly\r\nm=image 4412 udptl t38\r\na=T38FaxVersion:0\r\na=T38MaxBitRate:14400\r\n";
diff --git a/openbsc/tests/bsc-nat/bsc_nat_test.c b/openbsc/tests/bsc-nat/bsc_nat_test.c
index 2914a01..e0d0051 100644
--- a/openbsc/tests/bsc-nat/bsc_nat_test.c
+++ b/openbsc/tests/bsc-nat/bsc_nat_test.c
@@ -683,7 +683,7 @@
 	}
 
 	ci = bsc_mgcp_extract_ci(crcx_resp);
-	if (ci != 1) {
+	if (ci != 0x0F) {
 		printf("Failed to parse the CI. Got: %d\n", ci);
 		abort();
 	}

-- 
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Gerrit-Project: openbsc
Gerrit-Branch: master
Gerrit-MessageType: newchange
Gerrit-Change-Id: I49b8b61644bf706162102dce268cae2265536fc5
Gerrit-Change-Number: 13778
Gerrit-PatchSet: 1
Gerrit-Owner: Daniel Willmann <dwillmann at sysmocom.de>
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