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osmo-msc/src/libmsc/smpp_smsc.c

1046 lines
28 KiB

/* 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 <osmocom/gsm/protocol/gsm_04_11.h>
#include "smpp_smsc.h"
#include <osmocom/msc/debug.h>
#include <osmocom/msc/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);
acl->alert_notifications = 1;
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);
if (esme->acl)
esme->acl->esme = NULL;
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 */
int smpp_route(const struct smsc *smsc, const struct osmo_smpp_addr *dest, struct osmo_esme **pesme)
{
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) {
*pesme = esme;
return 0;
} else
LOGP(DSMPP, LOGL_NOTICE, "[%s] is matching route, "
"but not bound for Rx, discarding MO SMS\n",
esme->system_id);
}
*pesme = NULL;
if (acl)
return GSM411_RP_CAUSE_MO_NET_OUT_OF_ORDER;
else
return GSM411_RP_CAUSE_MO_NUM_UNASSIGNED;
}
/*! \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 */
osmo_strlcpy((char*)bind_r.system_id, esme->smsc->system_id, sizeof(bind_r.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);
rc = PACK_AND_SEND(esme, &bind_r);
destroy_tlv(bind_r.tlv);
return rc;
}
/*! \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;
int rc;
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));
rc = PACK_AND_SEND(esme, &alert);
destroy_tlv(alert.tlv);
return rc;
}
/* \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);
LOGP(DSMPP, LOGL_DEBUG, "[%s] Tx DELIVER-SM (from %s)\n",
esme->system_id, deliver->source_addr);
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,
msgb_hexdump(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;
if (esme->acl)
esme->acl->esme = NULL;
smpp_esme_put(esme);
return -EBADF;
}
/* 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;
if (esme->acl)
esme->acl->esme = NULL;
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);
osmo_fd_setup(&esme->wqueue.bfd, fd, OSMO_FD_READ, osmo_wqueue_bfd_cb, esme, 0);
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)
{
smsc->listen_port = port;
/* Avoid use-after-free if bind_addr == smsc->bind_addr */
if (smsc->bind_addr == bind_addr)
return 0;
osmo_talloc_replace_string(smsc, &smsc->bind_addr, bind_addr);
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);
}
}