diff options
Diffstat (limited to 'src/gsup_server.c')
| -rw-r--r-- | src/gsup_server.c | 50 |
1 files changed, 50 insertions, 0 deletions
diff --git a/src/gsup_server.c b/src/gsup_server.c index 2870e9d..a22ee14 100644 --- a/src/gsup_server.c +++ b/src/gsup_server.c @@ -57,6 +57,56 @@ int osmo_gsup_conn_send(struct osmo_gsup_conn *conn, struct msgb *msg) return 0; } +/* Encode an error reponse to the given GSUP message with the given cause. + * Determine the error message type via OSMO_GSUP_TO_MSGT_ERROR(gsup_orig->message_type). + * Only send an error response if the original message is a Request message. + * On failure, log an error, but don't return anything: if an error occurs while trying to report an earlier error, + * there is nothing we can do really except log the error (there are no callers that would use the return code). + */ +void osmo_gsup_conn_send_err_reply(struct osmo_gsup_conn *conn, const struct osmo_gsup_message *gsup_orig, + enum gsm48_gmm_cause cause) +{ + struct osmo_gsup_message gsup_reply; + struct msgb *msg_out; + int rc; + + /* 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, + + /* 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); + + /* 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; + } + + msg_out = osmo_gsup_msgb_alloc("GSUP ERR response"); + rc = osmo_gsup_encode(msg_out, &gsup_reply); + if (rc) { + LOGP(DLGSUP, LOGL_ERROR, "%s: Unable to encode error response %s (rc=%d)\n", + osmo_quote_str(gsup_orig->imsi, -1), osmo_gsup_message_type_name(gsup_reply.message_type), + rc); + return; + } + + rc = osmo_gsup_conn_send(conn, msg_out); + if (rc) + LOGP(DLGSUP, LOGL_ERROR, "%s: Unable to send error response %s (rc=%d)\n", + osmo_quote_str(gsup_orig->imsi, -1), osmo_gsup_message_type_name(gsup_reply.message_type), + rc); +} + static int osmo_gsup_conn_oap_handle(struct osmo_gsup_conn *conn, struct msgb *msg_rx) { |