SMPP: add small utility program 'smpp_mirror'
This program binds as ESME transceiver to a SMSC and simply mirrors back
all SMS that it receives.
diff --git a/openbsc/src/utils/smpp_mirror.c b/openbsc/src/utils/smpp_mirror.c
new file mode 100644
index 0000000..213c681
--- /dev/null
+++ b/openbsc/src/utils/smpp_mirror.c
@@ -0,0 +1,316 @@
+#include <stdio.h>
+#include <unistd.h>
+#include <stdint.h>
+#include <errno.h>
+#include <string.h>
+
+#include <netinet/in.h>
+
+#include <smpp34.h>
+#include <smpp34_structs.h>
+#include <smpp34_params.h>
+
+#include <osmocom/core/utils.h>
+#include <osmocom/core/msgb.h>
+#include <osmocom/core/talloc.h>
+#include <osmocom/core/select.h>
+#include <osmocom/core/socket.h>
+#include <osmocom/core/write_queue.h>
+
+#include <openbsc/debug.h>
+
+/* FIXME: merge with smpp_smsc.c */
+#define SMPP_SYS_ID_LEN 16
+enum esme_read_state {
+ READ_ST_IN_LEN = 0,
+ READ_ST_IN_MSG = 1,
+};
+/* FIXME: merge with smpp_smsc.c */
+
+struct esme {
+ struct osmo_fd ofd;
+
+ uint32_t own_seq_nr;
+
+ struct osmo_wqueue wqueue;
+ enum esme_read_state read_state;
+ uint32_t read_len;
+ uint32_t read_idx;
+ struct msgb *read_msg;
+
+ uint8_t smpp_version;
+ char system_id[SMPP_SYS_ID_LEN+1];
+ char password[SMPP_SYS_ID_LEN+1];
+};
+
+/* FIXME: merge with smpp_smsc.c */
+#define SMPP34_UNPACK(rc, type, str, data, len) \
+ memset(str, 0, sizeof(*str)); \
+ rc = smpp34_unpack(type, str, data, len)
+#define INIT_RESP(type, resp, req) { \
+ memset((resp), 0, sizeof(*(resp))); \
+ (resp)->command_length = 0; \
+ (resp)->command_id = type; \
+ (resp)->command_status = ESME_ROK; \
+ (resp)->sequence_number = (req)->sequence_number; \
+}
+#define PACK_AND_SEND(esme, ptr) pack_and_send(esme, (ptr)->command_id, ptr)
+static inline uint32_t smpp_msgb_cmdid(struct msgb *msg)
+{
+ uint8_t *tmp = msgb_data(msg) + 4;
+ return ntohl(*(uint32_t *)tmp);
+}
+static uint32_t esme_inc_seq_nr(struct esme *esme)
+{
+ esme->own_seq_nr++;
+ if (esme->own_seq_nr > 0x7fffffff)
+ esme->own_seq_nr = 1;
+
+ return esme->own_seq_nr;
+}
+static int pack_and_send(struct esme *esme, uint32_t type, void *ptr)
+{
+ struct msgb *msg = msgb_alloc(4096, "SMPP_Tx");
+ int rc, rlen;
+ if (!msg)
+ return -ENOMEM;
+
+ rc = smpp34_pack(type, msg->tail, msgb_tailroom(msg), &rlen, ptr);
+ if (rc != 0) {
+ LOGP(DSMPP, LOGL_ERROR, "[%s] Error during smpp34_pack(): %s\n",
+ esme->system_id, smpp34_strerror);
+ msgb_free(msg);
+ return -EINVAL;
+ }
+ msgb_put(msg, rlen);
+
+ return osmo_wqueue_enqueue(&esme->wqueue, msg);
+}
+/* FIXME: merge with smpp_smsc.c */
+
+
+static int smpp_handle_deliver(struct esme *esme, struct msgb *msg)
+{
+ struct deliver_sm_t deliver;
+ struct deliver_sm_resp_t deliver_r;
+ struct submit_sm_t submit;
+ int rc;
+
+ memset(&deliver, 0, sizeof(deliver));
+ SMPP34_UNPACK(rc, DELIVER_SM, &deliver, msgb_data(msg), msgb_length(msg));
+ if (rc < 0)
+ return rc;
+
+ INIT_RESP(DELIVER_SM_RESP, &deliver_r, &deliver);
+
+ PACK_AND_SEND(esme, &deliver_r);
+
+ memset(&submit, 0, sizeof(submit));
+ submit.command_id = SUBMIT_SM;
+ submit.command_status = ESME_ROK;
+ submit.sequence_number = esme_inc_seq_nr(esme);
+
+ submit.dest_addr_ton = deliver.source_addr_ton;
+ submit.dest_addr_npi = deliver.source_addr_npi;
+ memcpy(submit.destination_addr, deliver.source_addr,
+ OSMO_MIN(sizeof(submit.destination_addr),
+ sizeof(deliver.source_addr)));
+
+ submit.source_addr_ton = deliver.dest_addr_ton;
+ submit.source_addr_npi = deliver.dest_addr_npi;
+ memcpy(submit.source_addr, deliver.destination_addr,
+ OSMO_MIN(sizeof(submit.source_addr),
+ sizeof(deliver.destination_addr)));
+
+ submit.esm_class = deliver.esm_class;
+ submit.protocol_id = deliver.protocol_id;
+ submit.priority_flag = deliver.priority_flag;
+ memcpy(submit.schedule_delivery_time, deliver.schedule_delivery_time,
+ OSMO_MIN(sizeof(submit.schedule_delivery_time),
+ sizeof(deliver.schedule_delivery_time)));
+ memcpy(submit.validity_period, deliver.validity_period,
+ OSMO_MIN(sizeof(submit.validity_period),
+ sizeof(deliver.validity_period)));
+ submit.registered_delivery = deliver.registered_delivery;
+ submit.replace_if_present_flag = deliver.replace_if_present_flag;
+ submit.data_coding = deliver.data_coding;
+ submit.sm_default_msg_id = deliver.sm_default_msg_id;
+ submit.sm_length = deliver.sm_length;
+ memcpy(submit.short_message, deliver.short_message,
+ OSMO_MIN(sizeof(submit.short_message),
+ sizeof(deliver.short_message)));
+ /* FIXME: TLV? */
+
+ return PACK_AND_SEND(esme, &submit);
+}
+
+static int bind_transceiver(struct esme *esme)
+{
+ struct bind_transceiver_t bind;
+
+ memset(&bind, 0, sizeof(bind));
+ bind.command_id = BIND_TRANSCEIVER;
+ bind.sequence_number = esme_inc_seq_nr(esme);
+ snprintf((char *)bind.system_id, sizeof(bind.system_id), "%s", esme->system_id);
+ snprintf((char *)bind.password, sizeof(bind.password), "%s", esme->password);
+ snprintf((char *)bind.system_type, sizeof(bind.system_type), "mirror");
+ bind.interface_version = esme->smpp_version;
+
+ return PACK_AND_SEND(esme, &bind);
+}
+
+static int smpp_pdu_rx(struct esme *esme, struct msgb *msg)
+{
+ uint32_t cmd_id = smpp_msgb_cmdid(msg);
+ int rc;
+
+ switch (cmd_id) {
+ case DELIVER_SM:
+ rc = smpp_handle_deliver(esme, msg);
+ break;
+ default:
+ break;
+ }
+
+ return rc;
+}
+
+/* FIXME: merge with smpp_smsc.c */
+static int esme_read_cb(struct osmo_fd *ofd)
+{
+ struct esme *esme = ofd->data;
+ uint32_t len;
+ uint8_t *lenptr = (uint8_t *) &len;
+ uint8_t *cur;
+ struct msgb *msg;
+ int rdlen;
+ int rc;
+
+ switch (esme->read_state) {
+ case READ_ST_IN_LEN:
+ rdlen = sizeof(uint32_t) - esme->read_idx;
+ rc = read(ofd->fd, lenptr + esme->read_idx, rdlen);
+ if (rc < 0) {
+ LOGP(DSMPP, LOGL_ERROR, "[%s] read returned %d\n",
+ esme->system_id, rc);
+ } else if (rc == 0) {
+ goto dead_socket;
+ } else
+ esme->read_idx += rc;
+ if (esme->read_idx >= sizeof(uint32_t)) {
+ esme->read_len = ntohl(len);
+ msg = msgb_alloc(esme->read_len, "SMPP Rx");
+ if (!msg)
+ return -ENOMEM;
+ esme->read_msg = msg;
+ cur = msgb_put(msg, sizeof(uint32_t));
+ memcpy(cur, lenptr, sizeof(uint32_t));
+ esme->read_state = READ_ST_IN_MSG;
+ esme->read_idx = sizeof(uint32_t);
+ }
+ break;
+ case READ_ST_IN_MSG:
+ msg = esme->read_msg;
+ rdlen = esme->read_len - esme->read_idx;
+ rc = read(ofd->fd, msg->tail, OSMO_MIN(rdlen, msgb_tailroom(msg)));
+ if (rc < 0) {
+ LOGP(DSMPP, LOGL_ERROR, "[%s] read returned %d\n",
+ esme->system_id, rc);
+ } else if (rc == 0) {
+ goto dead_socket;
+ } else {
+ esme->read_idx += rc;
+ msgb_put(msg, rc);
+ }
+
+ if (esme->read_idx >= esme->read_len) {
+ rc = smpp_pdu_rx(esme, esme->read_msg);
+ esme->read_msg = NULL;
+ esme->read_idx = 0;
+ esme->read_len = 0;
+ esme->read_state = READ_ST_IN_LEN;
+ }
+ break;
+ }
+
+ return 0;
+dead_socket:
+ msgb_free(esme->read_msg);
+ osmo_fd_unregister(&esme->wqueue.bfd);
+ close(esme->wqueue.bfd.fd);
+ esme->wqueue.bfd.fd = -1;
+ exit(2342);
+
+ return 0;
+}
+
+static void esme_write_cb(struct osmo_fd *ofd, struct msgb *msg)
+{
+ struct esme *esme = ofd->data;
+ int rc;
+
+ rc = write(ofd->fd, msgb_data(msg), msgb_length(msg));
+ if (rc == 0) {
+ osmo_fd_unregister(&esme->wqueue.bfd);
+ close(esme->wqueue.bfd.fd);
+ esme->wqueue.bfd.fd = -1;
+ exit(99);
+ } else if (rc < msgb_length(msg)) {
+ LOGP(DSMPP, LOGL_ERROR, "[%s] Short write\n", esme->system_id);
+ return;
+ }
+}
+
+static int smpp_esme_init(struct esme *esme, const char *host, uint16_t port)
+{
+ int rc;
+
+ if (port == 0)
+ port = 2775;
+
+ esme->own_seq_nr = rand();
+ esme_inc_seq_nr(esme);
+ osmo_wqueue_init(&esme->wqueue, 10);
+ esme->wqueue.bfd.data = esme;
+ esme->wqueue.read_cb = esme_read_cb;
+ esme->wqueue.write_cb = esme_write_cb;
+
+ rc = osmo_sock_init_ofd(&esme->wqueue.bfd, AF_UNSPEC, SOCK_STREAM,
+ IPPROTO_TCP, host, port, OSMO_SOCK_F_CONNECT);
+ if (rc < 0)
+ return rc;
+
+ return bind_transceiver(esme);
+}
+
+
+int main(int argc, char **argv)
+{
+ struct esme esme;
+ char *host = "localhost";
+ int port = 0;
+ int rc;
+
+ memset(&esme, 0, sizeof(esme));
+
+ osmo_init_logging(&log_info);
+
+ snprintf((char *) esme.system_id, sizeof(esme.system_id), "mirror");
+ snprintf((char *) esme.password, sizeof(esme.password), "mirror");
+ esme.smpp_version = 0x34;
+
+ if (argc >= 2)
+ host = argv[1];
+ if (argc >= 3)
+ port = atoi(argv[2]);
+
+ rc = smpp_esme_init(&esme, host, port);
+ if (rc < 0)
+ exit(1);
+
+ while (1) {
+ osmo_select_main(0);
+ }
+
+ exit(0);
+}