611 lines
15 KiB
C
611 lines
15 KiB
C
/* SMPP 3.4 interface, SMSC-side implementation */
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/* (C) 2012 by Harald Welte <laforge@gnumonks.org>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include <stdio.h>
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#include <unistd.h>
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#include <string.h>
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#include <stdint.h>
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#include <errno.h>
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#include <sys/socket.h>
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#include <netinet/in.h>
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#include <smpp34.h>
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#include <smpp34_structs.h>
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#include <smpp34_params.h>
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#include <osmocom/core/utils.h>
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#include <osmocom/core/socket.h>
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#include <osmocom/core/msgb.h>
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#include <osmocom/core/logging.h>
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#include <osmocom/core/write_queue.h>
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#include <osmocom/core/talloc.h>
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#include "smpp_smsc.h"
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#include <openbsc/debug.h>
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/*! \brief Ugly wrapper. libsmpp34 should do this itself! */
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#define SMPP34_UNPACK(rc, type, str, data, len) \
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memset(str, 0, sizeof(*str)); \
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rc = smpp34_unpack(type, str, data, len)
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enum emse_bind {
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ESME_BIND_RX = 0x01,
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ESME_BIND_TX = 0x02,
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};
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/*! \brief increaes the use/reference count */
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void smpp_esme_get(struct osmo_esme *esme)
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{
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esme->use++;
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}
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static void esme_destroy(struct osmo_esme *esme)
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{
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osmo_wqueue_clear(&esme->wqueue);
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if (esme->wqueue.bfd.fd >= 0) {
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osmo_fd_unregister(&esme->wqueue.bfd);
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close(esme->wqueue.bfd.fd);
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}
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llist_del(&esme->list);
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talloc_free(esme);
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}
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/*! \brief decrease the use/reference count, free if it is 0 */
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void smpp_esme_put(struct osmo_esme *esme)
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{
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esme->use--;
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if (esme->use <= 0)
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esme_destroy(esme);
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}
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static struct osmo_esme *
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esme_by_system_id(const struct smsc *smsc, char *system_id)
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{
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struct osmo_esme *e;
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llist_for_each_entry(e, &smsc->esme_list, list) {
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if (!strcmp(e->system_id, system_id))
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return e;
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}
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return NULL;
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}
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/*! \brief initialize the libsmpp34 data structure for a response */
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#define INIT_RESP(type, resp, req) { \
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memset((resp), 0, sizeof(*(resp))); \
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(resp)->command_length = 0; \
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(resp)->command_id = type; \
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(resp)->command_status = ESME_ROK; \
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(resp)->sequence_number = (req)->sequence_number; \
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}
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/*! \brief pack a libsmpp34 data strcutrure and send it to the ESME */
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#define PACK_AND_SEND(esme, ptr) pack_and_send(esme, (ptr)->command_id, ptr)
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static int pack_and_send(struct osmo_esme *esme, uint32_t type, void *ptr)
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{
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struct msgb *msg = msgb_alloc(4096, "SMPP_Tx");
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int rc, rlen;
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if (!msg)
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return -ENOMEM;
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rc = smpp34_pack(type, msg->tail, msgb_tailroom(msg), &rlen, ptr);
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if (rc != 0) {
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LOGP(DSMPP, LOGL_ERROR, "Error during smpp34_pack(): %s\n",
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smpp34_strerror);
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msgb_free(msg);
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return -EINVAL;
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}
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msgb_put(msg, rlen);
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return osmo_wqueue_enqueue(&esme->wqueue, msg);
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}
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/*! \brief transmit a generic NACK to a remote ESME */
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static int smpp_tx_gen_nack(struct osmo_esme *esme, uint32_t seq, uint32_t status)
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{
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struct generic_nack_t nack;
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nack.command_length = 0;
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nack.command_id = GENERIC_NACK;
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nack.sequence_number = seq;
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nack.command_status = status;
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return PACK_AND_SEND(esme, &nack);
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}
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/*! \brief retrieve SMPP command ID from a msgb */
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static inline uint32_t smpp_msgb_cmdid(struct msgb *msg)
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{
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uint8_t *tmp = msgb_data(msg) + 4;
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return ntohl(*(uint32_t *)tmp);
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}
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/*! \brief retrieve SMPP sequence number from a msgb */
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static inline uint32_t smpp_msgb_seq(struct msgb *msg)
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{
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uint8_t *tmp = msgb_data(msg);
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return ntohl(*(uint32_t *)tmp);
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}
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/*! \brief handle an incoming SMPP generic NACK */
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static int smpp_handle_gen_nack(struct osmo_esme *esme, struct msgb *msg)
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{
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struct generic_nack_t nack;
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char buf[SMALL_BUFF];
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int rc;
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SMPP34_UNPACK(rc, GENERIC_NACK, &nack, msgb_data(msg),
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msgb_length(msg));
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if (rc < 0)
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return rc;
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LOGP(DSMPP, LOGL_ERROR, "%s: GENERIC NACK: %s\n", esme->system_id,
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str_command_status(nack.command_status, buf));
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return 0;
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}
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/*! \brief handle an incoming SMPP BIND RECEIVER */
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static int smpp_handle_bind_rx(struct osmo_esme *esme, struct msgb *msg)
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{
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struct bind_receiver_t bind;
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struct bind_receiver_resp_t bind_r;
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int rc;
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SMPP34_UNPACK(rc, BIND_RECEIVER, &bind, msgb_data(msg),
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msgb_length(msg));
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if (rc < 0)
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return rc;
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INIT_RESP(BIND_TRANSMITTER_RESP, &bind_r, &bind);
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LOGP(DSMPP, LOGL_INFO, "%s: BIND Rx from (Version %02x)\n",
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bind.system_id, bind.interface_version);
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if (bind.interface_version != SMPP_VERSION) {
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bind_r.command_status = ESME_RSYSERR;
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goto err;
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}
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if (esme->bind_flags) {
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bind_r.command_status = ESME_RALYBND;
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goto err;
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}
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esme->smpp_version = bind.interface_version;
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snprintf(esme->system_id, sizeof(esme->system_id), "%s",
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bind.system_id);
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esme->bind_flags = ESME_BIND_RX;
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/* FIXME */
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err:
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return 0;
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}
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/*! \brief handle an incoming SMPP BIND TRANSMITTER */
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static int smpp_handle_bind_tx(struct osmo_esme *esme, struct msgb *msg)
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{
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struct bind_transmitter_t bind;
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struct bind_transmitter_resp_t bind_r;
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struct tlv_t tlv;
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int rc;
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SMPP34_UNPACK(rc, BIND_TRANSMITTER, &bind, msgb_data(msg),
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msgb_length(msg));
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if (rc < 0) {
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printf("error during unpack: %s\n", smpp34_strerror);
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return rc;
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}
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INIT_RESP(BIND_TRANSMITTER_RESP, &bind_r, &bind);
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LOGP(DSMPP, LOGL_INFO, "%s: BIND Tx (Version %02x)\n",
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bind.system_id, bind.interface_version);
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if (bind.interface_version != SMPP_VERSION) {
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bind_r.command_status = ESME_RSYSERR;
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goto err;
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}
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if (esme->bind_flags) {
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bind_r.command_status = ESME_RALYBND;
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goto err;
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}
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esme->smpp_version = bind.interface_version;
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snprintf(esme->system_id, sizeof(esme->system_id), "%s", bind.system_id);
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esme->bind_flags = ESME_BIND_TX;
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/* build response */
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snprintf((char *)bind_r.system_id, sizeof(bind_r.system_id), "%s",
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esme->smsc->system_id);
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/* add interface version TLV */
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tlv.tag = TLVID_sc_interface_version;
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tlv.length = sizeof(uint8_t);
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tlv.value.val16 = esme->smpp_version;
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build_tlv(&bind_r.tlv, &tlv);
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err:
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return PACK_AND_SEND(esme, &bind_r);
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}
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/*! \brief handle an incoming SMPP BIND TRANSCEIVER */
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static int smpp_handle_bind_trx(struct osmo_esme *esme, struct msgb *msg)
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{
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struct bind_transceiver_t bind;
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struct bind_transceiver_resp_t bind_r;
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int rc;
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SMPP34_UNPACK(rc, BIND_TRANSCEIVER, &bind, msgb_data(msg),
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msgb_length(msg));
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if (rc < 0)
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return rc;
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INIT_RESP(BIND_TRANSMITTER_RESP, &bind_r, &bind);
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LOGP(DSMPP, LOGL_INFO, "%s: BIND Trx (Version %02x)\n",
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bind.system_id, bind.interface_version);
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if (bind.interface_version != SMPP_VERSION) {
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bind_r.command_status = ESME_RSYSERR;
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goto err;
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}
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if (esme->bind_flags) {
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bind_r.command_status = ESME_RALYBND;
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goto err;
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}
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esme->smpp_version = bind.interface_version;
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snprintf(esme->system_id, sizeof(esme->system_id), "%s", bind.system_id);
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esme->bind_flags |= ESME_BIND_TX | ESME_BIND_RX;
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/* FIXME */
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err:
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return 0;
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}
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/*! \brief handle an incoming SMPP UNBIND */
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static int smpp_handle_unbind(struct osmo_esme *esme, struct msgb *msg)
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{
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struct unbind_t unbind;
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struct unbind_resp_t unbind_r;
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int rc;
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SMPP34_UNPACK(rc, UNBIND, &unbind, msgb_data(msg),
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msgb_length(msg));
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if (rc < 0)
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return rc;
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INIT_RESP(UNBIND_RESP, &unbind_r, &unbind);
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LOGP(DSMPP, LOGL_INFO, "%s: UNBIND\n", esme->system_id);
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if (esme->bind_flags == 0) {
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unbind_r.command_status = ESME_RINVBNDSTS;
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goto err;
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}
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esme->bind_flags = 0;
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err:
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return PACK_AND_SEND(esme, &unbind_r);
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}
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/*! \brief handle an incoming SMPP ENQUIRE LINK */
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static int smpp_handle_enq_link(struct osmo_esme *esme, struct msgb *msg)
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{
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struct enquire_link_t enq;
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struct enquire_link_resp_t enq_r;
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int rc;
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SMPP34_UNPACK(rc, ENQUIRE_LINK, &enq, msgb_data(msg),
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msgb_length(msg));
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if (rc < 0)
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return rc;
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LOGP(DSMPP, LOGL_DEBUG, "%s: Enquire Link\n", esme->system_id);
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INIT_RESP(ENQUIRE_LINK_RESP, &enq_r, &enq);
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return PACK_AND_SEND(esme, &enq_r);
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}
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/*! \brief send a SUBMIT-SM RESPONSE to a remote ESME */
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int smpp_tx_submit_r(struct osmo_esme *esme, uint32_t sequence_nr,
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uint32_t command_status, char *msg_id)
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{
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struct submit_sm_resp_t submit_r;
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memset(&submit_r, 0, sizeof(submit_r));
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submit_r.command_length = 0;
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submit_r.command_id = SUBMIT_SM_RESP;
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submit_r.command_status = command_status;
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submit_r.sequence_number= sequence_nr;
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snprintf((char *) submit_r.message_id, sizeof(submit_r.message_id), "%s", msg_id);
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return PACK_AND_SEND(esme, &submit_r);
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}
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static const struct value_string smpp_avail_strs[] = {
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{ 0, "Available" },
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{ 1, "Denied" },
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{ 2, "Unavailable" },
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{ 0, NULL }
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};
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/*! \brief send an ALERT_NOTIFICATION to a remote ESME */
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int smpp_tx_alert(struct osmo_esme *esme, uint8_t ton, uint8_t npi,
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const char *addr, uint8_t avail_status)
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{
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struct alert_notification_t alert;
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struct tlv_t tlv;
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memset(&alert, 0, sizeof(alert));
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alert.command_length = 0;
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alert.command_id = ALERT_NOTIFICATION;
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alert.command_status = ESME_ROK;
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alert.sequence_number = esme->own_seq_nr++;
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alert.source_addr_ton = ton;
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alert.source_addr_npi = npi;
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snprintf(alert.source_addr, sizeof(alert.source_addr), "%s", addr);
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tlv.tag = TLVID_ms_availability_status;
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tlv.length = sizeof(uint8_t);
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tlv.value.val08 = avail_status;
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build_tlv(&alert.tlv, &tlv);
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LOGP(DSMPP, LOGL_DEBUG, "[%s] Tx ALERT_NOTIFICATION (%s/%u/%u): %s\n",
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esme->system_id, alert.source_addr, alert.source_addr_ton,
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alert.source_addr_npi,
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get_value_string(smpp_avail_strs, avail_status));
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return PACK_AND_SEND(esme, &alert);
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}
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/*! \brief handle an incoming SMPP SUBMIT-SM */
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static int smpp_handle_submit(struct osmo_esme *esme, struct msgb *msg)
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{
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struct submit_sm_t submit;
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struct submit_sm_resp_t submit_r;
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int rc;
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memset(&submit, 0, sizeof(submit));
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SMPP34_UNPACK(rc, SUBMIT_SM, &submit, msgb_data(msg),
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msgb_length(msg));
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if (rc < 0)
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return rc;
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INIT_RESP(SUBMIT_SM_RESP, &submit_r, &submit);
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if (!(esme->bind_flags & ESME_BIND_TX)) {
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submit_r.command_status = ESME_RINVBNDSTS;
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return PACK_AND_SEND(esme, &submit_r);
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}
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LOGP(DSMPP, LOGL_INFO, "%s: SUBMIT-SM(%s)\n", esme->system_id,
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submit.service_type);
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INIT_RESP(SUBMIT_SM_RESP, &submit_r, &submit);
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rc = handle_smpp_submit(esme, &submit, &submit_r);
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if (rc == 0)
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return PACK_AND_SEND(esme, &submit_r);
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return rc;
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}
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/*! \brief one complete SMPP PDU from the ESME has been received */
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static int smpp_pdu_rx(struct osmo_esme *esme, struct msgb *msg)
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{
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uint32_t cmd_id = smpp_msgb_cmdid(msg);
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int rc = 0;
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LOGP(DSMPP, LOGL_DEBUG, "%s: smpp_pdu_rx(%s)\n", esme->system_id,
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osmo_hexdump(msgb_data(msg), msgb_length(msg)));
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switch (cmd_id) {
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case GENERIC_NACK:
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rc = smpp_handle_gen_nack(esme, msg);
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break;
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case BIND_RECEIVER:
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rc = smpp_handle_bind_rx(esme, msg);
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break;
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case BIND_TRANSMITTER:
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rc = smpp_handle_bind_tx(esme, msg);
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break;
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case BIND_TRANSCEIVER:
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rc = smpp_handle_bind_trx(esme, msg);
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break;
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case UNBIND:
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rc = smpp_handle_unbind(esme, msg);
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break;
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case ENQUIRE_LINK:
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rc = smpp_handle_enq_link(esme, msg);
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break;
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case SUBMIT_SM:
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rc = smpp_handle_submit(esme, msg);
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break;
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case DELIVER_SM:
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break;
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case DATA_SM:
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break;
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case CANCEL_SM:
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case QUERY_SM:
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case REPLACE_SM:
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case SUBMIT_MULTI:
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LOGP(DSMPP, LOGL_NOTICE, "%s: Unimplemented PDU Commmand "
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"0x%08x\n", esme->system_id, cmd_id);
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break;
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default:
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LOGP(DSMPP, LOGL_ERROR, "%s: Unknown PDU Command 0x%08x\n",
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esme->system_id, cmd_id);
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rc = smpp_tx_gen_nack(esme, smpp_msgb_seq(msg), ESME_RINVCMDID);
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break;
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}
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return rc;
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}
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/* !\brief call-back when per-ESME TCP socket has some data to be read */
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static int esme_link_read_cb(struct osmo_fd *ofd)
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{
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struct osmo_esme *esme = ofd->data;
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uint32_t len;
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uint8_t *lenptr = (uint8_t *) &len;
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uint8_t *cur;
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struct msgb *msg;
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int rdlen;
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int rc;
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switch (esme->read_state) {
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case READ_ST_IN_LEN:
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rdlen = sizeof(uint32_t) - esme->read_idx;
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rc = read(ofd->fd, lenptr + esme->read_idx, rdlen);
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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);
|
|
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 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) {
|
|
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;
|
|
}
|
|
}
|
|
|
|
/* 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;
|
|
|
|
smpp_esme_get(esme);
|
|
esme->own_seq_nr = rand();
|
|
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);
|
|
}
|
|
|
|
/*! \brief Initialize the SMSC-side SMPP implementation */
|
|
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;
|
|
}
|