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-rw-r--r--src/libmsc/smpp_smsc.c1030
1 files changed, 1030 insertions, 0 deletions
diff --git a/src/libmsc/smpp_smsc.c b/src/libmsc/smpp_smsc.c
new file mode 100644
index 000000000..48a119261
--- /dev/null
+++ b/src/libmsc/smpp_smsc.c
@@ -0,0 +1,1030 @@
+/* SMPP 3.4 interface, SMSC-side implementation */
+/* (C) 2012 by Harald Welte <laforge@gnumonks.org>
+ *
+ * All Rights Reserved
+ *
+ * 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.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+
+#include <stdio.h>
+#include <unistd.h>
+#include <string.h>
+#include <stdint.h>
+#include <errno.h>
+#include <limits.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>
+#include <openbsc/gsm_data.h>
+
+/*! \brief Ugly wrapper. libsmpp34 should do this itself! */
+#define SMPP34_UNPACK(rc, type, str, data, len) \
+ memset(str, 0, sizeof(*str)); \
+ rc = smpp34_unpack(type, str, data, len)
+
+enum emse_bind {
+ ESME_BIND_RX = 0x01,
+ ESME_BIND_TX = 0x02,
+};
+
+const struct value_string smpp_status_strs[] = {
+ { ESME_ROK, "No Error" },
+ { ESME_RINVMSGLEN, "Message Length is invalid" },
+ { ESME_RINVCMDLEN, "Command Length is invalid" },
+ { ESME_RINVCMDID, "Invalid Command ID" },
+ { ESME_RINVBNDSTS, "Incorrect BIND Status for given command" },
+ { ESME_RALYBND, "ESME Already in Bound State" },
+ { ESME_RINVPRTFLG, "Invalid Priority Flag" },
+ { ESME_RINVREGDLVFLG, "Invalid Registered Delivery Flag" },
+ { ESME_RSYSERR, "System Error" },
+ { ESME_RINVSRCADR, "Invalid Source Address" },
+ { ESME_RINVDSTADR, "Invalid Destination Address" },
+ { ESME_RINVMSGID, "Message ID is invalid" },
+ { ESME_RBINDFAIL, "Bind failed" },
+ { ESME_RINVPASWD, "Invalid Password" },
+ { ESME_RINVSYSID, "Invalid System ID" },
+ { ESME_RCANCELFAIL, "Cancel SM Failed" },
+ { ESME_RREPLACEFAIL, "Replace SM Failed" },
+ { ESME_RMSGQFUL, "Message Queue Full" },
+ { ESME_RINVSERTYP, "Invalid Service Type" },
+ { ESME_RINVNUMDESTS, "Invalid number of destinations" },
+ { ESME_RINVDLNAME, "Invalid Distribution List name" },
+ { ESME_RINVDESTFLAG, "Destination flag is invalid" },
+ { ESME_RINVSUBREP, "Invalid submit with replace request" },
+ { ESME_RINVESMCLASS, "Invalid esm_class field data" },
+ { ESME_RCNTSUBDL, "Cannot Submit to Distribution List" },
+ { ESME_RSUBMITFAIL, "submit_sm or submit_multi failed" },
+ { ESME_RINVSRCTON, "Invalid Source address TON" },
+ { ESME_RINVSRCNPI, "Invalid Sourec address NPI" },
+ { ESME_RINVDSTTON, "Invalid Destination address TON" },
+ { ESME_RINVDSTNPI, "Invalid Desetination address NPI" },
+ { ESME_RINVSYSTYP, "Invalid system_type field" },
+ { ESME_RINVREPFLAG, "Invalid replace_if_present field" },
+ { ESME_RINVNUMMSGS, "Invalid number of messages" },
+ { ESME_RTHROTTLED, "Throttling error (ESME has exceeded message limits)" },
+ { ESME_RINVSCHED, "Invalid Scheduled Delivery Time" },
+ { ESME_RINVEXPIRY, "Invalid message validity period (Expiry time)" },
+ { ESME_RINVDFTMSGID, "Predefined Message Invalid or Not Found" },
+ { ESME_RX_T_APPN, "ESME Receiver Temporary App Error Code" },
+ { ESME_RX_P_APPN, "ESME Receiver Permanent App Error Code" },
+ { ESME_RX_R_APPN, "ESME Receiver Reject Message Error Code" },
+ { ESME_RQUERYFAIL, "query_sm request failed" },
+ { ESME_RINVOPTPARSTREAM,"Error in the optional part of the PDU Body" },
+ { ESME_ROPTPARNOTALLWD, "Optional Parameter not allowed" },
+ { ESME_RINVPARLEN, "Invalid Parameter Length" },
+ { ESME_RMISSINGOPTPARAM,"Expected Optional Parameter missing" },
+ { ESME_RINVOPTPARAMVAL, "Invalid Optional Parameter Value" },
+ { ESME_RDELIVERYFAILURE,"Delivery Failure (used for data_sm_resp)" },
+ { ESME_RUNKNOWNERR, "Unknown Error" },
+ { 0, NULL }
+};
+
+/*! \brief compare if two SMPP addresses are equal */
+int smpp_addr_eq(const struct osmo_smpp_addr *a,
+ const struct osmo_smpp_addr *b)
+{
+ if (a->ton == b->ton &&
+ a->npi == b->npi &&
+ !strcmp(a->addr, b->addr))
+ return 1;
+
+ return 0;
+}
+
+
+struct osmo_smpp_acl *smpp_acl_by_system_id(struct smsc *smsc,
+ const char *sys_id)
+{
+ struct osmo_smpp_acl *acl;
+
+ llist_for_each_entry(acl, &smsc->acl_list, list) {
+ if (!strcmp(acl->system_id, sys_id))
+ return acl;
+ }
+
+ return NULL;
+}
+
+struct osmo_smpp_acl *smpp_acl_alloc(struct smsc *smsc, const char *sys_id)
+{
+ struct osmo_smpp_acl *acl;
+
+ if (strlen(sys_id) > SMPP_SYS_ID_LEN)
+ return NULL;
+
+ if (smpp_acl_by_system_id(smsc, sys_id))
+ return NULL;
+
+ acl = talloc_zero(smsc, struct osmo_smpp_acl);
+ if (!acl)
+ return NULL;
+
+ acl->smsc = smsc;
+ strcpy(acl->system_id, sys_id);
+ INIT_LLIST_HEAD(&acl->route_list);
+
+ llist_add_tail(&acl->list, &smsc->acl_list);
+
+ return acl;
+}
+
+void smpp_acl_delete(struct osmo_smpp_acl *acl)
+{
+ struct osmo_smpp_route *r, *r2;
+
+ llist_del(&acl->list);
+
+ /* kill any active ESMEs */
+ if (acl->esme) {
+ struct osmo_esme *esme = acl->esme;
+ osmo_fd_unregister(&esme->wqueue.bfd);
+ close(esme->wqueue.bfd.fd);
+ esme->wqueue.bfd.fd = -1;
+ esme->acl = NULL;
+ smpp_esme_put(esme);
+ }
+
+ /* delete all routes for this ACL */
+ llist_for_each_entry_safe(r, r2, &acl->route_list, list) {
+ llist_del(&r->list);
+ llist_del(&r->global_list);
+ talloc_free(r);
+ }
+
+ talloc_free(acl);
+}
+
+static struct osmo_smpp_route *route_alloc(struct osmo_smpp_acl *acl)
+{
+ struct osmo_smpp_route *r;
+
+ r = talloc_zero(acl, struct osmo_smpp_route);
+ if (!r)
+ return NULL;
+
+ llist_add_tail(&r->list, &acl->route_list);
+ llist_add_tail(&r->global_list, &acl->smsc->route_list);
+
+ return r;
+}
+
+int smpp_route_pfx_add(struct osmo_smpp_acl *acl,
+ const struct osmo_smpp_addr *pfx)
+{
+ struct osmo_smpp_route *r;
+
+ llist_for_each_entry(r, &acl->route_list, list) {
+ if (r->type == SMPP_ROUTE_PREFIX &&
+ smpp_addr_eq(&r->u.prefix, pfx))
+ return -EEXIST;
+ }
+
+ r = route_alloc(acl);
+ if (!r)
+ return -ENOMEM;
+ r->type = SMPP_ROUTE_PREFIX;
+ r->acl = acl;
+ memcpy(&r->u.prefix, pfx, sizeof(r->u.prefix));
+
+ return 0;
+}
+
+int smpp_route_pfx_del(struct osmo_smpp_acl *acl,
+ const struct osmo_smpp_addr *pfx)
+{
+ struct osmo_smpp_route *r, *r2;
+
+ llist_for_each_entry_safe(r, r2, &acl->route_list, list) {
+ if (r->type == SMPP_ROUTE_PREFIX &&
+ smpp_addr_eq(&r->u.prefix, pfx)) {
+ llist_del(&r->list);
+ talloc_free(r);
+ return 0;
+ }
+ }
+
+ return -ENODEV;
+}
+
+
+/*! \brief increaes the use/reference count */
+void smpp_esme_get(struct osmo_esme *esme)
+{
+ esme->use++;
+}
+
+static void esme_destroy(struct osmo_esme *esme)
+{
+ osmo_wqueue_clear(&esme->wqueue);
+ if (esme->wqueue.bfd.fd >= 0) {
+ osmo_fd_unregister(&esme->wqueue.bfd);
+ close(esme->wqueue.bfd.fd);
+ }
+ smpp_cmd_flush_pending(esme);
+ llist_del(&esme->list);
+ talloc_free(esme);
+}
+
+static uint32_t esme_inc_seq_nr(struct osmo_esme *esme)
+{
+ esme->own_seq_nr++;
+ if (esme->own_seq_nr > 0x7fffffff)
+ esme->own_seq_nr = 1;
+
+ return esme->own_seq_nr;
+}
+
+/*! \brief decrease the use/reference count, free if it is 0 */
+void smpp_esme_put(struct osmo_esme *esme)
+{
+ esme->use--;
+ if (esme->use <= 0)
+ esme_destroy(esme);
+}
+
+/*! \brief try to find a SMPP route (ESME) for given destination */
+struct osmo_esme *
+smpp_route(const struct smsc *smsc, const struct osmo_smpp_addr *dest)
+{
+ struct osmo_smpp_route *r;
+ struct osmo_smpp_acl *acl = NULL;
+
+ DEBUGP(DSMPP, "Looking up route for (%u/%u/%s)\n",
+ dest->ton, dest->npi, dest->addr);
+
+ /* search for a specific route */
+ llist_for_each_entry(r, &smsc->route_list, global_list) {
+ switch (r->type) {
+ case SMPP_ROUTE_PREFIX:
+ DEBUGP(DSMPP, "Checking prefix route (%u/%u/%s)->%s\n",
+ r->u.prefix.ton, r->u.prefix.npi, r->u.prefix.addr,
+ r->acl->system_id);
+ if (r->u.prefix.ton == dest->ton &&
+ r->u.prefix.npi == dest->npi &&
+ !strncmp(r->u.prefix.addr, dest->addr,
+ strlen(r->u.prefix.addr))) {
+ DEBUGP(DSMPP, "Found prefix route ACL\n");
+ acl = r->acl;
+ }
+ break;
+ default:
+ break;
+ }
+
+ if (acl)
+ break;
+ }
+
+ if (!acl) {
+ /* check for default route */
+ if (smsc->def_route) {
+ DEBUGP(DSMPP, "Using existing default route\n");
+ acl = smsc->def_route;
+ }
+ }
+
+ if (acl && acl->esme) {
+ struct osmo_esme *esme;
+ DEBUGP(DSMPP, "ACL even has ESME, we can route to it!\n");
+ esme = acl->esme;
+ if (esme->bind_flags & ESME_BIND_RX)
+ return esme;
+ else
+ LOGP(DSMPP, LOGL_NOTICE, "[%s] is matching route, "
+ "but not bound for Rx, discarding MO SMS\n",
+ esme->system_id);
+ }
+
+ return NULL;
+}
+
+
+/*! \brief initialize the libsmpp34 data structure for a response */
+#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; \
+}
+
+/*! \brief pack a libsmpp34 data strcutrure and send it to the ESME */
+#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, "[%s] Error during smpp34_pack(): %s\n",
+ esme->system_id, smpp34_strerror);
+ msgb_free(msg);
+ return -EINVAL;
+ }
+ msgb_put(msg, rlen);
+
+ if (osmo_wqueue_enqueue(&esme->wqueue, msg) != 0) {
+ LOGP(DSMPP, LOGL_ERROR, "[%s] Write queue full. Dropping message\n",
+ esme->system_id);
+ msgb_free(msg);
+ return -EAGAIN;
+ }
+ return 0;
+}
+
+/*! \brief transmit a generic NACK to a remote ESME */
+static int smpp_tx_gen_nack(struct osmo_esme *esme, uint32_t seq, uint32_t status)
+{
+ struct generic_nack_t nack;
+ char buf[SMALL_BUFF];
+
+ nack.command_length = 0;
+ nack.command_id = GENERIC_NACK;
+ nack.sequence_number = seq;
+ nack.command_status = status;
+
+ LOGP(DSMPP, LOGL_ERROR, "[%s] Tx GENERIC NACK: %s\n",
+ esme->system_id, str_command_status(status, buf));
+
+ return PACK_AND_SEND(esme, &nack);
+}
+
+/*! \brief retrieve SMPP command ID from a msgb */
+static inline uint32_t smpp_msgb_cmdid(struct msgb *msg)
+{
+ uint8_t *tmp = msgb_data(msg) + 4;
+ return ntohl(*(uint32_t *)tmp);
+}
+
+/*! \brief retrieve SMPP sequence number from a msgb */
+static inline uint32_t smpp_msgb_seq(struct msgb *msg)
+{
+ uint8_t *tmp = msgb_data(msg);
+ return ntohl(*(uint32_t *)tmp);
+}
+
+/*! \brief handle an incoming SMPP generic NACK */
+static int smpp_handle_gen_nack(struct osmo_esme *esme, struct msgb *msg)
+{
+ struct generic_nack_t nack;
+ char buf[SMALL_BUFF];
+ int rc;
+
+ SMPP34_UNPACK(rc, GENERIC_NACK, &nack, msgb_data(msg),
+ msgb_length(msg));
+ if (rc < 0) {
+ LOGP(DSMPP, LOGL_ERROR, "[%s] Error in smpp34_unpack():%s\n",
+ esme->system_id, smpp34_strerror);
+ return rc;
+ }
+
+ LOGP(DSMPP, LOGL_ERROR, "[%s] Rx GENERIC NACK: %s\n",
+ esme->system_id, str_command_status(nack.command_status, buf));
+
+ return 0;
+}
+
+static int _process_bind(struct osmo_esme *esme, uint8_t if_version,
+ uint32_t bind_flags, const char *sys_id,
+ const char *passwd)
+{
+ struct osmo_smpp_acl *acl;
+
+ if (if_version != SMPP_VERSION)
+ return ESME_RSYSERR;
+
+ if (esme->bind_flags)
+ return ESME_RALYBND;
+
+ esme->smpp_version = if_version;
+ snprintf(esme->system_id, sizeof(esme->system_id), "%s", sys_id);
+
+ acl = smpp_acl_by_system_id(esme->smsc, esme->system_id);
+ if (!esme->smsc->accept_all) {
+ if (!acl) {
+ /* This system is unknown */
+ return ESME_RINVSYSID;
+ } else {
+ if (strlen(acl->passwd) &&
+ strcmp(acl->passwd, passwd)) {
+ return ESME_RINVPASWD;
+ }
+ }
+ }
+ if (acl) {
+ esme->acl = acl;
+ acl->esme = esme;
+ }
+
+ esme->bind_flags = bind_flags;
+
+ return ESME_ROK;
+}
+
+
+/*! \brief handle an incoming SMPP BIND RECEIVER */
+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;
+
+ SMPP34_UNPACK(rc, BIND_RECEIVER, &bind, msgb_data(msg),
+ msgb_length(msg));
+ if (rc < 0) {
+ LOGP(DSMPP, LOGL_ERROR, "[%s] Error in smpp34_unpack():%s\n",
+ esme->system_id, smpp34_strerror);
+ return rc;
+ }
+
+ INIT_RESP(BIND_TRANSMITTER_RESP, &bind_r, &bind);
+
+ LOGP(DSMPP, LOGL_INFO, "[%s] Rx BIND Rx from (Version %02x)\n",
+ bind.system_id, bind.interface_version);
+
+ rc = _process_bind(esme, bind.interface_version, ESME_BIND_RX,
+ (const char *)bind.system_id, (const char *)bind.password);
+ bind_r.command_status = rc;
+
+ return PACK_AND_SEND(esme, &bind_r);
+}
+
+/*! \brief handle an incoming SMPP BIND TRANSMITTER */
+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;
+
+ SMPP34_UNPACK(rc, BIND_TRANSMITTER, &bind, msgb_data(msg),
+ msgb_length(msg));
+ if (rc < 0) {
+ LOGP(DSMPP, LOGL_ERROR, "[%s] Error in smpp34_unpack():%s\n",
+ esme->system_id, smpp34_strerror);
+ return rc;
+ }
+
+ INIT_RESP(BIND_TRANSMITTER_RESP, &bind_r, &bind);
+
+ LOGP(DSMPP, LOGL_INFO, "[%s] Rx BIND Tx (Version %02x)\n",
+ bind.system_id, bind.interface_version);
+
+ rc = _process_bind(esme, bind.interface_version, ESME_BIND_TX,
+ (const char *)bind.system_id, (const char *)bind.password);
+ bind_r.command_status = rc;
+
+ /* 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);
+
+ return PACK_AND_SEND(esme, &bind_r);
+}
+
+/*! \brief handle an incoming SMPP BIND TRANSCEIVER */
+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;
+
+ SMPP34_UNPACK(rc, BIND_TRANSCEIVER, &bind, msgb_data(msg),
+ msgb_length(msg));
+ if (rc < 0) {
+ LOGP(DSMPP, LOGL_ERROR, "[%s] Error in smpp34_unpack():%s\n",
+ esme->system_id, smpp34_strerror);
+ return rc;
+ }
+
+ INIT_RESP(BIND_TRANSCEIVER_RESP, &bind_r, &bind);
+
+ LOGP(DSMPP, LOGL_INFO, "[%s] Rx BIND Trx (Version %02x)\n",
+ bind.system_id, bind.interface_version);
+
+ rc = _process_bind(esme, bind.interface_version, ESME_BIND_RX|ESME_BIND_TX,
+ (const char *)bind.system_id, (const char *)bind.password);
+ bind_r.command_status = rc;
+
+ return PACK_AND_SEND(esme, &bind_r);
+}
+
+/*! \brief handle an incoming SMPP UNBIND */
+static int smpp_handle_unbind(struct osmo_esme *esme, struct msgb *msg)
+{
+ struct unbind_t unbind;
+ struct unbind_resp_t unbind_r;
+ int rc;
+
+ SMPP34_UNPACK(rc, UNBIND, &unbind, msgb_data(msg),
+ msgb_length(msg));
+ if (rc < 0) {
+ LOGP(DSMPP, LOGL_ERROR, "[%s] Error in smpp34_unpack():%s\n",
+ esme->system_id, smpp34_strerror);
+ return rc;
+ }
+
+ INIT_RESP(UNBIND_RESP, &unbind_r, &unbind);
+
+ LOGP(DSMPP, LOGL_INFO, "[%s] Rx 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);
+}
+
+/*! \brief handle an incoming SMPP ENQUIRE LINK */
+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;
+
+ SMPP34_UNPACK(rc, ENQUIRE_LINK, &enq, msgb_data(msg),
+ msgb_length(msg));
+ if (rc < 0) {
+ LOGP(DSMPP, LOGL_ERROR, "[%s] Error in smpp34_unpack():%s\n",
+ esme->system_id, smpp34_strerror);
+ return rc;
+ }
+
+ LOGP(DSMPP, LOGL_DEBUG, "[%s] Rx Enquire Link\n", esme->system_id);
+
+ INIT_RESP(ENQUIRE_LINK_RESP, &enq_r, &enq);
+
+ LOGP(DSMPP, LOGL_DEBUG, "[%s] Tx Enquire Link Response\n", esme->system_id);
+
+ return PACK_AND_SEND(esme, &enq_r);
+}
+
+/*! \brief send a SUBMIT-SM RESPONSE to a remote ESME */
+int smpp_tx_submit_r(struct osmo_esme *esme, uint32_t sequence_nr,
+ uint32_t command_status, char *msg_id)
+{
+ struct submit_sm_resp_t submit_r;
+
+ memset(&submit_r, 0, sizeof(submit_r));
+ submit_r.command_length = 0;
+ submit_r.command_id = SUBMIT_SM_RESP;
+ submit_r.command_status = command_status;
+ submit_r.sequence_number= sequence_nr;
+ snprintf((char *) submit_r.message_id, sizeof(submit_r.message_id), "%s", msg_id);
+
+ return PACK_AND_SEND(esme, &submit_r);
+}
+
+static const struct value_string smpp_avail_strs[] = {
+ { 0, "Available" },
+ { 1, "Denied" },
+ { 2, "Unavailable" },
+ { 0, NULL }
+};
+
+/*! \brief send an ALERT_NOTIFICATION to a remote ESME */
+int smpp_tx_alert(struct osmo_esme *esme, uint8_t ton, uint8_t npi,
+ const char *addr, uint8_t avail_status)
+{
+ struct alert_notification_t alert;
+ struct tlv_t tlv;
+
+ memset(&alert, 0, sizeof(alert));
+ alert.command_length = 0;
+ alert.command_id = ALERT_NOTIFICATION;
+ alert.command_status = ESME_ROK;
+ alert.sequence_number = esme_inc_seq_nr(esme);
+ alert.source_addr_ton = ton;
+ alert.source_addr_npi = npi;
+ snprintf((char *)alert.source_addr, sizeof(alert.source_addr), "%s", addr);
+
+ tlv.tag = TLVID_ms_availability_status;
+ tlv.length = sizeof(uint8_t);
+ tlv.value.val08 = avail_status;
+ build_tlv(&alert.tlv, &tlv);
+
+ LOGP(DSMPP, LOGL_DEBUG, "[%s] Tx ALERT_NOTIFICATION (%s/%u/%u): %s\n",
+ esme->system_id, alert.source_addr, alert.source_addr_ton,
+ alert.source_addr_npi,
+ get_value_string(smpp_avail_strs, avail_status));
+
+ return PACK_AND_SEND(esme, &alert);
+}
+
+/* \brief send a DELIVER-SM message to given ESME */
+int smpp_tx_deliver(struct osmo_esme *esme, struct deliver_sm_t *deliver)
+{
+ deliver->sequence_number = esme_inc_seq_nr(esme);
+
+ return PACK_AND_SEND(esme, deliver);
+}
+
+/*! \brief handle an incoming SMPP DELIVER-SM RESPONSE */
+static int smpp_handle_deliver_resp(struct osmo_esme *esme, struct msgb *msg)
+{
+ struct deliver_sm_resp_t deliver_r;
+ struct osmo_smpp_cmd *cmd;
+ int rc;
+
+ memset(&deliver_r, 0, sizeof(deliver_r));
+ SMPP34_UNPACK(rc, DELIVER_SM_RESP, &deliver_r, msgb_data(msg),
+ msgb_length(msg));
+ if (rc < 0) {
+ LOGP(DSMPP, LOGL_ERROR, "[%s] Error in smpp34_unpack():%s\n",
+ esme->system_id, smpp34_strerror);
+ return rc;
+ }
+
+ cmd = smpp_cmd_find_by_seqnum(esme, deliver_r.sequence_number);
+ if (!cmd) {
+ LOGP(DSMPP, LOGL_ERROR, "[%s] Rx DELIVER-SM RESP !? (%s)\n",
+ esme->system_id, get_value_string(smpp_status_strs,
+ deliver_r.command_status));
+ return -1;
+ }
+
+ if (deliver_r.command_status == ESME_ROK)
+ smpp_cmd_ack(cmd);
+ else
+ smpp_cmd_err(cmd, deliver_r.command_status);
+
+ LOGP(DSMPP, LOGL_INFO, "[%s] Rx DELIVER-SM RESP (%s)\n",
+ esme->system_id, get_value_string(smpp_status_strs,
+ deliver_r.command_status));
+
+ return 0;
+}
+
+/*! \brief handle an incoming SMPP SUBMIT-SM */
+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;
+
+ memset(&submit, 0, sizeof(submit));
+ SMPP34_UNPACK(rc, SUBMIT_SM, &submit, msgb_data(msg),
+ msgb_length(msg));
+ if (rc < 0) {
+ LOGP(DSMPP, LOGL_ERROR, "[%s] Error in smpp34_unpack():%s\n",
+ esme->system_id, smpp34_strerror);
+ 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] Rx SUBMIT-SM (%s/%u/%u)\n",
+ esme->system_id, submit.destination_addr,
+ submit.dest_addr_ton, submit.dest_addr_npi);
+
+ 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;
+}
+
+/*! \brief one complete SMPP PDU from the ESME has been received */
+static int smpp_pdu_rx(struct osmo_esme *esme, struct msgb *msg __uses)
+{
+ 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_RESP:
+ rc = smpp_handle_deliver_resp(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 Command "
+ "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;
+}
+
+/* This macro should be called after a call to read() in the read_cb of an
+ * osmo_fd to properly check for errors.
+ * rc is the return value of read, err_label is the label to jump to in case of
+ * an error. The code there should handle closing the connection.
+ * FIXME: This code should go in libosmocore utils.h so it can be used by other
+ * projects as well.
+ * */
+#define OSMO_FD_CHECK_READ(rc, err_label) \
+ if (rc < 0) { \
+ /* EINTR is a non-fatal error, just try again */ \
+ if (errno == EINTR) \
+ return 0; \
+ goto err_label; \
+ } else if (rc == 0) { \
+ goto err_label; \
+ }
+
+/* !\brief 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;
+ ssize_t rdlen, 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 %zd (%s)\n",
+ esme->system_id, rc, strerror(errno));
+ OSMO_FD_CHECK_READ(rc, dead_socket);
+
+ esme->read_idx += rc;
+
+ if (esme->read_idx >= sizeof(uint32_t)) {
+ esme->read_len = ntohl(len);
+ if (esme->read_len < 8 || esme->read_len > UINT16_MAX) {
+ LOGP(DSMPP, LOGL_ERROR, "[%s] length invalid %u\n",
+ esme->system_id, esme->read_len);
+ goto dead_socket;
+ }
+
+ 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 %zd (%s)\n",
+ esme->system_id, rc, strerror(errno));
+ OSMO_FD_CHECK_READ(rc, dead_socket);
+
+ esme->read_idx += rc;
+ msgb_put(msg, rc);
+
+ if (esme->read_idx >= esme->read_len) {
+ rc = smpp_pdu_rx(esme, esme->read_msg);
+ msgb_free(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;
+ smpp_esme_put(esme);
+
+ return 0;
+}
+
+/* call-back of write queue once it wishes to write a message to the socket */
+static int 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) {
+ osmo_fd_unregister(&esme->wqueue.bfd);
+ close(esme->wqueue.bfd.fd);
+ esme->wqueue.bfd.fd = -1;
+ smpp_esme_put(esme);
+ } else if (rc < msgb_length(msg)) {
+ LOGP(DSMPP, LOGL_ERROR, "[%s] Short write\n", esme->system_id);
+ return -1;
+ }
+
+ return 0;
+}
+
+/* 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) {
+ close(fd);
+ return -ENOMEM;
+ }
+
+ INIT_LLIST_HEAD(&esme->smpp_cmd_list);
+ smpp_esme_get(esme);
+ esme->own_seq_nr = rand();
+ esme_inc_seq_nr(esme);
+ 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;
+
+ if (osmo_fd_register(&esme->wqueue.bfd) != 0) {
+ close(fd);
+ talloc_free(esme);
+ return -EIO;
+ }
+
+ 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);
+}
+
+/*! \brief allocate and initialize an smsc struct from talloc context ctx. */
+struct smsc *smpp_smsc_alloc_init(void *ctx)
+{
+ struct smsc *smsc = talloc_zero(ctx, struct smsc);
+
+ INIT_LLIST_HEAD(&smsc->esme_list);
+ INIT_LLIST_HEAD(&smsc->acl_list);
+ INIT_LLIST_HEAD(&smsc->route_list);
+
+ smsc->listen_ofd.data = smsc;
+ smsc->listen_ofd.cb = smsc_fd_cb;
+
+ return smsc;
+}
+
+/*! \brief Set the SMPP address and port without binding. */
+int smpp_smsc_conf(struct smsc *smsc, const char *bind_addr, uint16_t port)
+{
+ talloc_free((void*)smsc->bind_addr);
+ smsc->bind_addr = NULL;
+ if (bind_addr) {
+ smsc->bind_addr = talloc_strdup(smsc, bind_addr);
+ if (!smsc->bind_addr)
+ return -ENOMEM;
+ }
+ smsc->listen_port = port;
+ return 0;
+}
+
+/*! \brief Bind to given address and port and accept connections.
+ * \param[in] bind_addr Local IP address, may be NULL for any.
+ * \param[in] port TCP port number, may be 0 for default SMPP (2775).
+ */
+int smpp_smsc_start(struct smsc *smsc, const char *bind_addr, uint16_t port)
+{
+ int rc;
+
+ /* default port for SMPP */
+ if (!port)
+ port = 2775;
+
+ smpp_smsc_stop(smsc);
+
+ LOGP(DSMPP, LOGL_NOTICE, "SMPP at %s %d\n",
+ bind_addr? bind_addr : "0.0.0.0", port);
+
+ rc = osmo_sock_init_ofd(&smsc->listen_ofd, AF_UNSPEC, SOCK_STREAM,
+ IPPROTO_TCP, bind_addr, port,
+ OSMO_SOCK_F_BIND);
+ if (rc < 0)
+ return rc;
+
+ /* store new address and port */
+ rc = smpp_smsc_conf(smsc, bind_addr, port);
+ if (rc)
+ smpp_smsc_stop(smsc);
+ return rc;
+}
+
+/*! \brief Change a running connection to a different address/port, and upon
+ * error switch back to the running configuration. */
+int smpp_smsc_restart(struct smsc *smsc, const char *bind_addr, uint16_t port)
+{
+ int rc;
+
+ rc = smpp_smsc_start(smsc, bind_addr, port);
+ if (rc)
+ /* if there is an error, try to re-bind to the old port */
+ return smpp_smsc_start(smsc, smsc->bind_addr, smsc->listen_port);
+ return 0;
+}
+
+/*! /brief Close SMPP connection. */
+void smpp_smsc_stop(struct smsc *smsc)
+{
+ if (smsc->listen_ofd.fd > 0) {
+ close(smsc->listen_ofd.fd);
+ smsc->listen_ofd.fd = 0;
+ osmo_fd_unregister(&smsc->listen_ofd);
+ }
+}