Initial support of SMPP interface for MT-SMS
diff --git a/openbsc/src/libmsc/smpp_smsc.c b/openbsc/src/libmsc/smpp_smsc.c
new file mode 100644
index 0000000..ff6b1f9
--- /dev/null
+++ b/openbsc/src/libmsc/smpp_smsc.c
@@ -0,0 +1,506 @@
+/* SMPP 3.4 interface, SMSC-side implementation */
+/* (C) 2012 by Harald Welte <laforge@gnumonks.org>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ */
+
+
+#include <stdio.h>
+#include <unistd.h>
+#include <string.h>
+#include <stdint.h>
+#include <errno.h>
+
+#include <sys/socket.h>
+#include <netinet/in.h>
+
+#include <smpp34.h>
+#include <smpp34_structs.h>
+#include <smpp34_params.h>
+
+#include <osmocom/core/utils.h>
+#include <osmocom/core/socket.h>
+#include <osmocom/core/msgb.h>
+#include <osmocom/core/logging.h>
+#include <osmocom/core/write_queue.h>
+#include <osmocom/core/talloc.h>
+
+#include "smpp_smsc.h"
+
+#include <openbsc/debug.h>
+
+enum emse_bind {
+ ESME_BIND_RX = 0x01,
+ ESME_BIND_TX = 0x02,
+};
+
+
+
+#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 int pack_and_send(struct osmo_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, "Error during smpp34_pack(): %s\n",
+ smpp34_strerror);
+ msgb_free(msg);
+ return -EINVAL;
+ }
+ msgb_put(msg, rlen);
+
+ return osmo_wqueue_enqueue(&esme->wqueue, msg);
+}
+
+static int smpp_tx_gen_nack(struct osmo_esme *esme, uint32_t seq, uint32_t status)
+{
+ struct generic_nack_t nack;
+
+ nack.command_length = 0;
+ nack.command_id = GENERIC_NACK;
+ nack.sequence_number = seq;
+ nack.command_status = status;
+
+ return PACK_AND_SEND(esme, &nack);
+}
+
+static inline uint32_t smpp_msgb_cmdid(struct msgb *msg)
+{
+ uint8_t *tmp = msgb_data(msg) + 4;
+ return ntohl(*(uint32_t *)tmp);
+}
+
+static inline uint32_t smpp_msgb_seq(struct msgb *msg)
+{
+ uint8_t *tmp = msgb_data(msg);
+ return ntohl(*(uint32_t *)tmp);
+}
+
+
+static int smpp_handle_gen_nack(struct osmo_esme *esme, struct msgb *msg)
+{
+ struct generic_nack_t nack;
+ char buf[SMALL_BUFF];
+ int rc;
+
+ rc = smpp34_unpack(GENERIC_NACK, &nack, msgb_data(msg),
+ msgb_length(msg));
+ if (rc < 0)
+ return rc;
+
+ LOGP(DSMPP, LOGL_ERROR, "%s: GENERIC NACK: %s\n", esme->system_id,
+ str_command_status(nack.command_status, buf));
+
+ return 0;
+}
+
+static int smpp_handle_bind_rx(struct osmo_esme *esme, struct msgb *msg)
+{
+ struct bind_receiver_t bind;
+ struct bind_receiver_resp_t bind_r;
+ int rc;
+
+ rc = smpp34_unpack(BIND_RECEIVER, &bind, msgb_data(msg),
+ msgb_length(msg));
+ if (rc < 0)
+ return rc;
+
+ INIT_RESP(BIND_TRANSMITTER_RESP, &bind_r, &bind);
+
+ LOGP(DSMPP, LOGL_INFO, "%s: BIND Rx from (Version %02x)\n",
+ bind.system_id, bind.interface_version);
+
+ if (bind.interface_version != SMPP_VERSION) {
+ bind_r.command_status = ESME_RSYSERR;
+ goto err;
+ }
+
+ if (esme->bind_flags) {
+ bind_r.command_status = ESME_RALYBND;
+ goto err;
+ }
+
+ esme->smpp_version = bind.interface_version;
+ snprintf(esme->system_id, sizeof(esme->system_id), "%s",
+ bind.system_id);
+ esme->bind_flags = ESME_BIND_RX;
+
+ /* FIXME */
+err:
+ return 0;
+}
+
+static int smpp_handle_bind_tx(struct osmo_esme *esme, struct msgb *msg)
+{
+ struct bind_transmitter_t bind;
+ struct bind_transmitter_resp_t bind_r;
+ struct tlv_t tlv;
+ int rc;
+
+ rc = smpp34_unpack(BIND_TRANSMITTER, &bind, msgb_data(msg),
+ msgb_length(msg));
+ if (rc < 0) {
+ printf("error during unpack: %s\n", smpp34_strerror);
+ return rc;
+ }
+
+ INIT_RESP(BIND_TRANSMITTER_RESP, &bind_r, &bind);
+
+ LOGP(DSMPP, LOGL_INFO, "%s: BIND Tx (Version %02x)\n",
+ bind.system_id, bind.interface_version);
+
+ if (bind.interface_version != SMPP_VERSION) {
+ bind_r.command_status = ESME_RSYSERR;
+ goto err;
+ }
+
+ if (esme->bind_flags) {
+ bind_r.command_status = ESME_RALYBND;
+ goto err;
+ }
+
+ esme->smpp_version = bind.interface_version;
+ snprintf(esme->system_id, sizeof(esme->system_id), "%s", bind.system_id);
+ esme->bind_flags = ESME_BIND_TX;
+
+ /* build response */
+ snprintf((char *)bind_r.system_id, sizeof(bind_r.system_id), "%s",
+ esme->smsc->system_id);
+
+ /* add interface version TLV */
+ tlv.tag = TLVID_sc_interface_version;
+ tlv.length = sizeof(uint8_t);
+ tlv.value.val16 = esme->smpp_version;
+ build_tlv(&bind_r.tlv, &tlv);
+
+err:
+ return PACK_AND_SEND(esme, &bind_r);
+}
+
+static int smpp_handle_bind_trx(struct osmo_esme *esme, struct msgb *msg)
+{
+ struct bind_transceiver_t bind;
+ struct bind_transceiver_resp_t bind_r;
+ int rc;
+
+ rc = smpp34_unpack(BIND_TRANSCEIVER, &bind, msgb_data(msg),
+ msgb_length(msg));
+ if (rc < 0)
+ return rc;
+
+ INIT_RESP(BIND_TRANSMITTER_RESP, &bind_r, &bind);
+
+ LOGP(DSMPP, LOGL_INFO, "%s: BIND Trx (Version %02x)\n",
+ bind.system_id, bind.interface_version);
+
+ if (bind.interface_version != SMPP_VERSION) {
+ bind_r.command_status = ESME_RSYSERR;
+ goto err;
+ }
+
+ if (esme->bind_flags) {
+ bind_r.command_status = ESME_RALYBND;
+ goto err;
+ }
+
+ esme->smpp_version = bind.interface_version;
+ snprintf(esme->system_id, sizeof(esme->system_id), "%s", bind.system_id);
+ esme->bind_flags |= ESME_BIND_TX | ESME_BIND_RX;
+
+ /* FIXME */
+err:
+ return 0;
+}
+
+static int smpp_handle_unbind(struct osmo_esme *esme, struct msgb *msg)
+{
+ struct unbind_t unbind;
+ struct unbind_resp_t unbind_r;
+ int rc;
+
+ rc = smpp34_unpack(UNBIND, &unbind, msgb_data(msg),
+ msgb_length(msg));
+ if (rc < 0)
+ return rc;
+
+ INIT_RESP(UNBIND_RESP, &unbind_r, &unbind);
+
+ LOGP(DSMPP, LOGL_INFO, "%s: UNBIND\n", esme->system_id);
+
+ if (esme->bind_flags == 0) {
+ unbind_r.command_status = ESME_RINVBNDSTS;
+ goto err;
+ }
+
+ esme->bind_flags = 0;
+err:
+ return PACK_AND_SEND(esme, &unbind_r);
+}
+
+
+static int smpp_handle_enq_link(struct osmo_esme *esme, struct msgb *msg)
+{
+ struct enquire_link_t enq;
+ struct enquire_link_resp_t enq_r;
+ int rc;
+
+ rc = smpp34_unpack(ENQUIRE_LINK, &enq, msgb_data(msg),
+ msgb_length(msg));
+ if (rc < 0)
+ return rc;
+
+ LOGP(DSMPP, LOGL_DEBUG, "%s: Enquire Link\n", esme->system_id);
+
+ INIT_RESP(ENQUIRE_LINK_RESP, &enq_r, &enq);
+
+ return PACK_AND_SEND(esme, &enq_r);
+}
+
+static int smpp_handle_submit(struct osmo_esme *esme, struct msgb *msg)
+{
+ struct submit_sm_t submit;
+ struct submit_sm_resp_t submit_r;
+ int rc;
+
+ rc = smpp34_unpack(SUBMIT_SM, &submit, msgb_data(msg),
+ msgb_length(msg));
+ if (rc < 0)
+ return rc;
+
+ INIT_RESP(SUBMIT_SM_RESP, &submit_r, &submit);
+
+ if (!(esme->bind_flags & ESME_BIND_TX)) {
+ submit_r.command_status = ESME_RINVBNDSTS;
+ return PACK_AND_SEND(esme, &submit_r);
+ }
+
+ LOGP(DSMPP, LOGL_INFO, "%s: SUBMIT-SM(%s)\n", esme->system_id,
+ submit.service_type);
+
+ INIT_RESP(SUBMIT_SM_RESP, &submit_r, &submit);
+
+ rc = handle_smpp_submit(esme, &submit, &submit_r);
+ if (rc == 0)
+ return PACK_AND_SEND(esme, &submit_r);
+
+ return rc;
+}
+
+/* one complete SMPP PDU from the ESME has been received */
+static int smpp_pdu_rx(struct osmo_esme *esme, struct msgb *msg)
+{
+ uint32_t cmd_id = smpp_msgb_cmdid(msg);
+ int rc = 0;
+
+ LOGP(DSMPP, LOGL_DEBUG, "%s: smpp_pdu_rx(%s)\n", esme->system_id,
+ osmo_hexdump(msgb_data(msg), msgb_length(msg)));
+
+ switch (cmd_id) {
+ case GENERIC_NACK:
+ rc = smpp_handle_gen_nack(esme, msg);
+ break;
+ case BIND_RECEIVER:
+ rc = smpp_handle_bind_rx(esme, msg);
+ break;
+ case BIND_TRANSMITTER:
+ rc = smpp_handle_bind_tx(esme, msg);
+ break;
+ case BIND_TRANSCEIVER:
+ rc = smpp_handle_bind_trx(esme, msg);
+ break;
+ case UNBIND:
+ rc = smpp_handle_unbind(esme, msg);
+ break;
+ case ENQUIRE_LINK:
+ rc = smpp_handle_enq_link(esme, msg);
+ break;
+ case SUBMIT_SM:
+ rc = smpp_handle_submit(esme, msg);
+ break;
+ case DELIVER_SM:
+ break;
+ case DATA_SM:
+ break;
+ case CANCEL_SM:
+ case QUERY_SM:
+ case REPLACE_SM:
+ case SUBMIT_MULTI:
+ LOGP(DSMPP, LOGL_NOTICE, "%s: Unimplemented PDU Commmand "
+ "0x%08x\n", esme->system_id, cmd_id);
+ break;
+ default:
+ LOGP(DSMPP, LOGL_ERROR, "%s: Unknown PDU Command 0x%08x\n",
+ esme->system_id, cmd_id);
+ rc = smpp_tx_gen_nack(esme, smpp_msgb_seq(msg), ESME_RINVCMDID);
+ break;
+ }
+
+ return rc;
+}
+
+static void esme_destroy(struct osmo_esme *esme)
+{
+ osmo_wqueue_clear(&esme->wqueue);
+ osmo_fd_unregister(&esme->wqueue.bfd);
+ close(esme->wqueue.bfd.fd);
+ llist_del(&esme->list);
+ talloc_free(esme);
+}
+
+/* call-back when per-ESME TCP socket has some data to be read */
+static int esme_link_read_cb(struct osmo_fd *ofd)
+{
+ struct osmo_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, "read returned %d\n", 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, "read returned %d\n", 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);
+ esme_destroy(esme);
+
+ return 0;
+}
+
+/* call-back of write queue once it wishes to write a message to the socket */
+static void esme_link_write_cb(struct osmo_fd *ofd, struct msgb *msg)
+{
+ struct osmo_esme *esme = ofd->data;
+ int rc;
+
+ rc = write(ofd->fd, msgb_data(msg), msgb_length(msg));
+ if (rc == 0) {
+ esme_destroy(esme);
+ } else if (rc < msgb_length(msg)) {
+ LOGP(DSMPP, LOGL_ERROR, "%s: Short write\n", esme->system_id);
+ return;
+ }
+}
+
+/* callback for already-accepted new TCP socket */
+static int link_accept_cb(struct smsc *smsc, int fd,
+ struct sockaddr_storage *s, socklen_t s_len)
+{
+ struct osmo_esme *esme = talloc_zero(smsc, struct osmo_esme);
+ if (!esme)
+ return -ENOMEM;
+
+ esme->smsc = smsc;
+ osmo_wqueue_init(&esme->wqueue, 10);
+ esme->wqueue.bfd.fd = fd;
+ esme->wqueue.bfd.data = esme;
+ esme->wqueue.bfd.when = BSC_FD_READ;
+ osmo_fd_register(&esme->wqueue.bfd);
+
+ esme->wqueue.read_cb = esme_link_read_cb;
+ esme->wqueue.write_cb = esme_link_write_cb;
+
+ esme->sa_len = OSMO_MIN(sizeof(esme->sa), s_len);
+ memcpy(&esme->sa, s, esme->sa_len);
+
+ llist_add_tail(&esme->list, &smsc->esme_list);
+
+ return 0;
+}
+
+/* callback of listening TCP socket */
+static int smsc_fd_cb(struct osmo_fd *ofd, unsigned int what)
+{
+ int rc;
+ struct sockaddr_storage sa;
+ socklen_t sa_len = sizeof(sa);
+
+ rc = accept(ofd->fd, (struct sockaddr *)&sa, &sa_len);
+ if (rc < 0) {
+ LOGP(DSMPP, LOGL_ERROR, "Accept returns %d (%s)\n",
+ rc, strerror(errno));
+ return rc;
+ }
+ return link_accept_cb(ofd->data, rc, &sa, sa_len);
+}
+
+int smpp_smsc_init(struct smsc *smsc, uint16_t port)
+{
+ int rc;
+
+ INIT_LLIST_HEAD(&smsc->esme_list);
+ smsc->listen_ofd.data = smsc;
+ smsc->listen_ofd.cb = smsc_fd_cb;
+ rc = osmo_sock_init_ofd(&smsc->listen_ofd, AF_UNSPEC, SOCK_STREAM,
+ IPPROTO_TCP, NULL, port, OSMO_SOCK_F_BIND);
+
+ return rc;
+}