pespin has uploaded this change for review. (
https://gerrit.osmocom.org/c/osmo-mgw/+/39715?usp=email )
Change subject: mgw: Validate CallID before updating endp->x_osmo_ign
......................................................................
mgw: Validate CallID before updating endp->x_osmo_ign
This allows already starting to mark a clear line in CRCX handling
function between *read-only parsing + validation* and *read-write
allocation and update* of objects.
This in turn will allow further clean up on the second mentioned step.
Change-Id: Ia41f7383171bb24f48297456935c633536aa7b05
---
M src/libosmo-mgcp/mgcp_msg.c
M src/libosmo-mgcp/mgcp_protocol.c
2 files changed, 22 insertions(+), 11 deletions(-)
git pull ssh://gerrit.osmocom.org:29418/osmo-mgw refs/changes/15/39715/1
diff --git a/src/libosmo-mgcp/mgcp_msg.c b/src/libosmo-mgcp/mgcp_msg.c
index ebaa32a..2269a66 100644
--- a/src/libosmo-mgcp/mgcp_msg.c
+++ b/src/libosmo-mgcp/mgcp_msg.c
@@ -276,10 +276,6 @@
if (!endp)
return -1;
- /* Accept any CallID for "X-Osmo-IGN: C" */
- if (endp->x_osmo_ign & MGCP_X_OSMO_IGN_CALLID)
- return 0;
-
if (!callid)
return -1;
if (!endp->callid)
diff --git a/src/libosmo-mgcp/mgcp_protocol.c b/src/libosmo-mgcp/mgcp_protocol.c
index ce397c8..b985a1b 100644
--- a/src/libosmo-mgcp/mgcp_protocol.c
+++ b/src/libosmo-mgcp/mgcp_protocol.c
@@ -928,12 +928,14 @@
}
}
- /* Update endp->x_osmo_ign: */
- endp->x_osmo_ign |= hpars->x_osmo_ign;
-
/* Check if this endpoint already serves a call, if so, check if the
- * callids match up so that we are sure that this is our call */
- if (endp->callid && mgcp_verify_call_id(endp, hpars->callid)) {
+ * callids match up so that we are sure that this is our call.
+ * Do check only if endpoint was (or is by current CRCX) configured
+ * to explicitly ignore it ("X-Osmo-IGN: C").
+ */
+ if (endp->callid &&
+ !((endp->x_osmo_ign | hpars->x_osmo_ign) & MGCP_X_OSMO_IGN_CALLID)
&&
+ mgcp_verify_call_id(endp, hpars->callid)) {
LOGPENDP(endp, DLMGCP, LOGL_ERROR,
"CRCX: already seized by other call (%s)\n",
endp->callid);
@@ -949,6 +951,14 @@
}
}
+ /*******************************************************************
+ * Allocate and update endpoint and conn.
+ * From here on below we start updating endpoing and creating conn:
+ *******************************************************************/
+
+ /* Update endp->x_osmo_ign: */
+ endp->x_osmo_ign |= hpars->x_osmo_ign;
+
if (!endp->callid) {
/* Claim endpoint resources. This will also set the callid,
* creating additional connections will only be possible if
@@ -1122,7 +1132,11 @@
return create_err_response(rq->trunk, NULL, -rc, "MDCX",
pdata->trans);
}
- if (hpars->callid && mgcp_verify_call_id(endp, hpars->callid) < 0) {
+ /* If a CallID is provided during MDCX, validate (unless endp was
explicitly configured to ignore it
+ * through "X-Osmo-IGN: C") that it matches the one previously set. */
+ if (hpars->callid &&
+ !(endp->x_osmo_ign & MGCP_X_OSMO_IGN_CALLID) &&
+ mgcp_verify_call_id(endp, hpars->callid) < 0) {
rate_ctr_inc(rate_ctr_group_get_ctr(rate_ctrs,
MGCP_MDCX_FAIL_INVALID_CALLID));
return create_err_response(endp, endp, 516, "MDCX",
pdata->trans);
}
@@ -1328,7 +1342,8 @@
rate_ctr_inc(rate_ctr_group_get_ctr(rate_ctrs,
MGCP_DLCX_FAIL_UNHANDLED_PARAM));
return create_err_response(rq->trunk, NULL, 539,
"DLCX", pdata->trans);
}
- if (mgcp_verify_call_id(endp, hpars->callid) != 0) {
+ if (!(endp->x_osmo_ign & MGCP_X_OSMO_IGN_CALLID) &&
+ mgcp_verify_call_id(endp, hpars->callid) != 0) {
rate_ctr_inc(rate_ctr_group_get_ctr(rate_ctrs,
MGCP_DLCX_FAIL_INVALID_CALLID));
return create_err_response(endp, endp, 516, "DLCX",
pdata->trans);
}
--
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Gerrit-MessageType: newchange
Gerrit-Project: osmo-mgw
Gerrit-Branch: master
Gerrit-Change-Id: Ia41f7383171bb24f48297456935c633536aa7b05
Gerrit-Change-Number: 39715
Gerrit-PatchSet: 1
Gerrit-Owner: pespin <pes...@sysmocom.de>
