lynxis lazus has uploaded this change for review.
RFC: add gsup_client_mux from osmo-msc
To mux multiple clients into a single gsup connection.
Change license to LGPL?
Change-Id: I916c1bb6cfc48f92fc5db2b5c914eb1b4e25fa7f
---
M include/Makefile.am
A include/osmocom/gsupclient/gsup_client_mux.h
M src/gsupclient/Makefile.am
A src/gsupclient/gsup_client_mux.c
4 files changed, 227 insertions(+), 0 deletions(-)
git pull ssh://gerrit.osmocom.org:29418/osmo-hlr refs/changes/12/38112/1
diff --git a/include/Makefile.am b/include/Makefile.am
index e93fe29..f3baca6 100644
--- a/include/Makefile.am
+++ b/include/Makefile.am
@@ -3,6 +3,7 @@
nobase_include_HEADERS = \
osmocom/gsupclient/cni_peer_id.h \
osmocom/gsupclient/gsup_client.h \
+ osmocom/gsupclient/gsup_client_mux.h \
osmocom/gsupclient/gsup_req.h \
osmocom/mslookup/mdns.h \
osmocom/mslookup/mdns_sock.h \
diff --git a/include/osmocom/gsupclient/gsup_client_mux.h b/include/osmocom/gsupclient/gsup_client_mux.h
new file mode 100644
index 0000000..f327786
--- /dev/null
+++ b/include/osmocom/gsupclient/gsup_client_mux.h
@@ -0,0 +1,34 @@
+#pragma once
+
+#include <osmocom/gsm/gsup.h>
+
+struct gsup_client_mux;
+struct ipaccess_unit;
+
+struct gsup_client_mux_rx_cb {
+ int (* func )(struct gsup_client_mux *gcm, void *data, const struct osmo_gsup_message *gsup_msg);
+ void *data;
+};
+
+/* A GSUP client shared between code paths for various GSUP Message Classes.
+ * The main task is to dispatch GSUP messages to code paths corresponding to the respective Message Class, i.e.
+ * subscriber management, SMS, SS/USSD and inter-MSC messaging.
+ * If a GSUP Message Class IE is present in the message, the received message is dispatched directly to the rx_cb entry
+ * for that Message Class. Otherwise, the Message Class is determined by a switch() on the Message Type.*/
+struct gsup_client_mux {
+ struct osmo_gsup_client *gsup_client;
+
+ /* Target clients by enum osmo_gsup_message_class */
+ struct gsup_client_mux_rx_cb rx_cb[OSMO_GSUP_MESSAGE_CLASS_ARRAYSIZE];
+};
+
+struct gsup_client_mux *gsup_client_mux_alloc(void *talloc_ctx);
+int gsup_client_mux_start(struct gsup_client_mux *gcm, const char *gsup_server_addr_str, uint16_t gsup_server_port,
+ struct ipaccess_unit *ipa_dev);
+
+int gsup_client_mux_tx(struct gsup_client_mux *gcm, const struct osmo_gsup_message *gsup_msg);
+void gsup_client_mux_tx_set_source(const struct gsup_client_mux *gcm, struct osmo_gsup_message *gsup_msg);
+void gsup_client_mux_tx_error_reply(struct gsup_client_mux *gcm, const struct osmo_gsup_message *gsup_orig,
+ enum gsm48_gmm_cause cause);
+
+int gsup_client_mux_rx(struct osmo_gsup_client *gsup_client, struct msgb *msg);
diff --git a/src/gsupclient/Makefile.am b/src/gsupclient/Makefile.am
index a627ccc..ab9c478 100644
--- a/src/gsupclient/Makefile.am
+++ b/src/gsupclient/Makefile.am
@@ -11,6 +11,7 @@
libosmo_gsup_client_la_SOURCES = \
cni_peer_id.c \
gsup_client.c \
+ gsup_client_mux.c \
gsup_req.c \
$(NULL)
diff --git a/src/gsupclient/gsup_client_mux.c b/src/gsupclient/gsup_client_mux.c
new file mode 100644
index 0000000..943ba2c
--- /dev/null
+++ b/src/gsupclient/gsup_client_mux.c
@@ -0,0 +1,191 @@
+/* Directing individual GSUP messages to their respective handlers. */
+/*
+ * (C) 2019 by sysmocom - s.f.m.c. GmbH <info@sysmocom.de>
+ * All Rights Reserved
+ *
+ * Author: Neels Hofmeyr
+ *
+ * SPDX-License-Identifier: AGPL-3.0+
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU Affero General Public License for more details.
+ */
+#include <errno.h>
+
+#include <osmocom/core/logging.h>
+
+#include <osmocom/gsupclient/gsup_client.h>
+#include <osmocom/gsupclient/gsup_client_mux.h>
+
+static enum osmo_gsup_message_class gsup_client_mux_classify(struct gsup_client_mux *gcm,
+ const struct osmo_gsup_message *gsup_msg)
+{
+ if (gsup_msg->message_class)
+ return gsup_msg->message_class;
+
+ LOGP(DLGSUP, LOGL_DEBUG, "No explicit GSUP Message Class, trying to guess from message type %s\n",
+ osmo_gsup_message_type_name(gsup_msg->message_type));
+
+ switch (gsup_msg->message_type) {
+ case OSMO_GSUP_MSGT_PROC_SS_REQUEST:
+ case OSMO_GSUP_MSGT_PROC_SS_RESULT:
+ case OSMO_GSUP_MSGT_PROC_SS_ERROR:
+ return OSMO_GSUP_MESSAGE_CLASS_USSD;
+
+ /* GSM 04.11 code implementing MO SMS */
+ case OSMO_GSUP_MSGT_MO_FORWARD_SM_ERROR:
+ case OSMO_GSUP_MSGT_MO_FORWARD_SM_RESULT:
+ case OSMO_GSUP_MSGT_READY_FOR_SM_ERROR:
+ case OSMO_GSUP_MSGT_READY_FOR_SM_RESULT:
+ case OSMO_GSUP_MSGT_MT_FORWARD_SM_REQUEST:
+ return OSMO_GSUP_MESSAGE_CLASS_SMS;
+
+ default:
+ return OSMO_GSUP_MESSAGE_CLASS_SUBSCRIBER_MANAGEMENT;
+ }
+}
+
+/* Non-static for unit tests */
+int gsup_client_mux_rx(struct osmo_gsup_client *gsup_client, struct msgb *msg)
+{
+ struct gsup_client_mux *gcm = gsup_client->data;
+ struct osmo_gsup_message gsup;
+ enum osmo_gsup_message_class message_class;
+ int rc;
+
+ rc = osmo_gsup_decode(msgb_l2(msg), msgb_l2len(msg), &gsup);
+ if (rc < 0) {
+ LOGP(DLGSUP, LOGL_ERROR, "Failed to decode GSUP message: '%s' (%d) [ %s]\n",
+ get_value_string(gsm48_gmm_cause_names, -rc), -rc, osmo_hexdump(msg->data, msg->len));
+ goto msgb_free_and_return;
+ }
+
+ if (!gsup.imsi[0]) {
+ LOGP(DLGSUP, LOGL_ERROR, "Failed to decode GSUP message: missing IMSI\n");
+ if (OSMO_GSUP_IS_MSGT_REQUEST(gsup.message_type))
+ gsup_client_mux_tx_error_reply(gcm, &gsup, GMM_CAUSE_INV_MAND_INFO);
+ rc = -GMM_CAUSE_INV_MAND_INFO;
+ goto msgb_free_and_return;
+ }
+
+ message_class = gsup_client_mux_classify(gcm, &gsup);
+
+ if (message_class <= OSMO_GSUP_MESSAGE_CLASS_UNSET || message_class >= ARRAY_SIZE(gcm->rx_cb)) {
+ LOGP(DLGSUP, LOGL_ERROR, "Failed to classify GSUP message target\n");
+ rc = -EINVAL;
+ goto msgb_free_and_return;
+ }
+
+ if (!gcm->rx_cb[message_class].func) {
+ LOGP(DLGSUP, LOGL_ERROR, "No receiver set up for GSUP Message Class %s\n", osmo_gsup_message_class_name(message_class));
+ rc = -ENOTSUP;
+ goto msgb_free_and_return;
+ }
+
+ rc = gcm->rx_cb[message_class].func(gcm, gcm->rx_cb[message_class].data, &gsup);
+
+msgb_free_and_return:
+ msgb_free(msg);
+ return rc;
+}
+
+/* Make it clear that struct gsup_client_mux should be talloc allocated, so that it can be used as talloc parent. */
+struct gsup_client_mux *gsup_client_mux_alloc(void *talloc_ctx)
+{
+ return talloc_zero(talloc_ctx, struct gsup_client_mux);
+}
+
+/* Start a GSUP client to serve this gsup_client_mux. */
+int gsup_client_mux_start(struct gsup_client_mux *gcm, const char *gsup_server_addr_str, uint16_t gsup_server_port,
+ struct ipaccess_unit *ipa_dev)
+{
+ gcm->gsup_client = osmo_gsup_client_create2(gcm, ipa_dev,
+ gsup_server_addr_str,
+ gsup_server_port,
+ &gsup_client_mux_rx, NULL);
+ if (!gcm->gsup_client)
+ return -ENOMEM;
+ gcm->gsup_client->data = gcm;
+ return 0;
+}
+
+int gsup_client_mux_tx(struct gsup_client_mux *gcm, const struct osmo_gsup_message *gsup_msg)
+{
+ struct msgb *msg;
+ int rc;
+
+ if (!gcm || !gcm->gsup_client) {
+ LOGP(DLGSUP, LOGL_ERROR, "GSUP link is down, cannot send GSUP message\n");
+ return -ENOTSUP;
+ }
+
+ msg = osmo_gsup_client_msgb_alloc();
+ rc = osmo_gsup_encode(msg, gsup_msg);
+ if (rc < 0) {
+ LOGP(DLGSUP, LOGL_ERROR, "Failed to encode GSUP message: '%s'\n", strerror(-rc));
+ return rc;
+ }
+
+ return osmo_gsup_client_send(gcm->gsup_client, msg);
+}
+
+/* Set GSUP source_name to our local IPA name */
+void gsup_client_mux_tx_set_source(const struct gsup_client_mux *gcm,
+ struct osmo_gsup_message *gsup_msg)
+{
+ const char *local_msc_name;
+
+ if (!gcm)
+ return;
+ if (!gcm->gsup_client)
+ return;
+ if (!gcm->gsup_client->ipa_dev)
+ return;
+ local_msc_name = gcm->gsup_client->ipa_dev->serno;
+ if (!local_msc_name)
+ return;
+ gsup_msg->source_name = (const uint8_t *) local_msc_name;
+ gsup_msg->source_name_len = strlen(local_msc_name) + 1;
+}
+
+/* Transmit GSUP error in response to original message */
+void gsup_client_mux_tx_error_reply(struct gsup_client_mux *gcm, const struct osmo_gsup_message *gsup_orig,
+ enum gsm48_gmm_cause cause)
+{
+ struct osmo_gsup_message gsup_reply;
+
+ /* No need to answer if we couldn't parse an ERROR message type, only REQUESTs need an error reply. */
+ if (!OSMO_GSUP_IS_MSGT_REQUEST(gsup_orig->message_type))
+ return;
+
+ gsup_reply = (struct osmo_gsup_message){
+ .cause = cause,
+ .message_type = OSMO_GSUP_TO_MSGT_ERROR(gsup_orig->message_type),
+ .message_class = gsup_orig->message_class,
+ .destination_name = gsup_orig->source_name,
+ .destination_name_len = gsup_orig->source_name_len,
+
+ /* RP-Message-Reference is mandatory for SM Service */
+ .sm_rp_mr = gsup_orig->sm_rp_mr,
+ };
+
+ OSMO_STRLCPY_ARRAY(gsup_reply.imsi, gsup_orig->imsi);
+ gsup_client_mux_tx_set_source(gcm, &gsup_reply);
+
+ /* For SS/USSD, it's important to keep both session state and ID IEs */
+ if (gsup_orig->session_state != OSMO_GSUP_SESSION_STATE_NONE) {
+ gsup_reply.session_state = OSMO_GSUP_SESSION_STATE_END;
+ gsup_reply.session_id = gsup_orig->session_id;
+ }
+
+ if (osmo_gsup_client_enc_send(gcm->gsup_client, &gsup_reply))
+ LOGP(DLGSUP, LOGL_ERROR, "Failed to send Error reply (imsi=%s)\n",
+ osmo_quote_str(gsup_orig->imsi, -1));
+}
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