gsupclient: introduce osmo_gsup_client_enc_send()

Several parts of OsmoMSC (e.g. GSM 04.11, 09.11, etc.) are dealing
with GSUP message encoding and sending towards OsmoHLR. In order
to avoid code duplication, let's have a shared function here.

Change-Id: I0589ff27933e9bca2bcf93b8259004935778db8f

2 files changed, 39 insertions, 0 deletions

diff --git a/include/osmocom/gsupclient/gsup_client.h b/include/osmocom/gsupclient/gsup_client.h
index 95163cd..154e3e0 100644
--- a/include/osmocom/gsupclient/gsup_client.h
+++ b/include/osmocom/gsupclient/gsup_client.h
@@ -24,6 +24,7 @@
 #include <osmocom/core/timer.h>
 #include <osmocom/gsm/oap_client.h>
 #include <osmocom/gsm/ipa.h>
+#include <osmocom/gsm/gsup.h>
 
 /* a loss of GSUP between MSC and HLR is considered quite serious, let's try to recover as quickly as
  * possible.  Even one new connection attempt per second should be quite acceptable until the link is
@@ -70,5 +71,7 @@ struct osmo_gsup_client *osmo_gsup_client_create(void *talloc_ctx,
 
 void osmo_gsup_client_destroy(struct osmo_gsup_client *gsupc);
 int osmo_gsup_client_send(struct osmo_gsup_client *gsupc, struct msgb *msg);
+int osmo_gsup_client_enc_send(struct osmo_gsup_client *gsupc,
+			      const struct osmo_gsup_message *gsup_msg);
 struct msgb *osmo_gsup_client_msgb_alloc(void);
 
diff --git a/src/gsupclient/gsup_client.c b/src/gsupclient/gsup_client.c
index f259bdc..c8408fd 100644
--- a/src/gsupclient/gsup_client.c
+++ b/src/gsupclient/gsup_client.c
@@ -360,6 +360,42 @@ int osmo_gsup_client_send(struct osmo_gsup_client *gsupc, struct msgb *msg)
 	return 0;
 }
 
+/*! Encode and send a GSUP message.
+ * \param[in] gsupc    GSUP client.
+ * \param[in] gsup_msg GSUP message to be sent.
+ * \returns 0 in case of success, negative on error.
+ */
+int osmo_gsup_client_enc_send(struct osmo_gsup_client *gsupc,
+			      const struct osmo_gsup_message *gsup_msg)
+{
+	struct msgb *gsup_msgb;
+	int rc;
+
+	gsup_msgb = osmo_gsup_client_msgb_alloc();
+	if (!gsup_msgb) {
+		LOGP(DLGSUP, LOGL_ERROR, "Couldn't allocate GSUP message\n");
+		return -ENOMEM;
+	}
+
+	rc = osmo_gsup_encode(gsup_msgb, gsup_msg);
+	if (rc) {
+		LOGP(DLGSUP, LOGL_ERROR, "Couldn't encode GSUP message\n");
+		goto error;
+	}
+
+	rc = osmo_gsup_client_send(gsupc, gsup_msgb);
+	if (rc) {
+		LOGP(DLGSUP, LOGL_ERROR, "Couldn't send GSUP message\n");
+		goto error;
+	}
+
+	return 0;
+
+error:
+	talloc_free(gsup_msgb);
+	return rc;
+}
+
 struct msgb *osmo_gsup_client_msgb_alloc(void)
 {
 	return msgb_alloc_headroom(4000, 64, __func__);