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smsc_smpp.c

/* ==================================================================== 
 * The Kannel Software License, Version 1.0 
 * 
 * Copyright (c) 2001-2004 Kannel Group  
 * Copyright (c) 1998-2001 WapIT Ltd.   
 * All rights reserved. 
 * 
 * Redistribution and use in source and binary forms, with or without 
 * modification, are permitted provided that the following conditions 
 * are met: 
 * 
 * 1. Redistributions of source code must retain the above copyright 
 *    notice, this list of conditions and the following disclaimer. 
 * 
 * 2. Redistributions in binary form must reproduce the above copyright 
 *    notice, this list of conditions and the following disclaimer in 
 *    the documentation and/or other materials provided with the 
 *    distribution. 
 * 
 * 3. The end-user documentation included with the redistribution, 
 *    if any, must include the following acknowledgment: 
 *       "This product includes software developed by the 
 *        Kannel Group (http://www.kannel.org/)." 
 *    Alternately, this acknowledgment may appear in the software itself, 
 *    if and wherever such third-party acknowledgments normally appear. 
 * 
 * 4. The names "Kannel" and "Kannel Group" must not be used to 
 *    endorse or promote products derived from this software without 
 *    prior written permission. For written permission, please  
 *    contact org@kannel.org. 
 * 
 * 5. Products derived from this software may not be called "Kannel", 
 *    nor may "Kannel" appear in their name, without prior written 
 *    permission of the Kannel Group. 
 * 
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED 
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 
 * DISCLAIMED.  IN NO EVENT SHALL THE KANNEL GROUP OR ITS CONTRIBUTORS 
 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,  
 * OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT  
 * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR  
 * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,  
 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE  
 * OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,  
 * EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 
 * ==================================================================== 
 * 
 * This software consists of voluntary contributions made by many 
 * individuals on behalf of the Kannel Group.  For more information on  
 * the Kannel Group, please see <http://www.kannel.org/>. 
 * 
 * Portions of this software are based upon software originally written at  
 * WapIT Ltd., Helsinki, Finland for the Kannel project.  
 */ 

/*
 * smsc_smpp.c - SMPP v3.3 and v3.4 implementation
 *
 * Lars Wirzenius
 * Stipe Tolj <tolj@wapme-systems.de>
 * Alexander Malysh  <a.malysh@centrium.de>
 */

/* XXX check SMSCConn conformance */
/* XXX UDH reception */
/* XXX check UDH sending fields esm_class and data_coding from GSM specs */
/* XXX charset conversions on incoming messages (didn't work earlier,
       either) */
/* XXX numbering plans and type of number: check spec */

#include "gwlib/gwlib.h"
#include "msg.h"
#include "smsc_p.h"
#include "smpp_pdu.h"
#include "smscconn_p.h"
#include "bb_smscconn_cb.h"
#include "sms.h"
#include "dlr.h"

/*
 * Select these based on whether you want to dump SMPP PDUs as they are
 * sent and received or not. Not dumping should be the default in at least
 * stable releases.
 */

#define DEBUG 1

#ifndef DEBUG
/* This version doesn't dump. */
static void dump_pdu(const char *msg, Octstr *id, SMPP_PDU *pdu)
{
}
#else
/* This version does dump. */
static void dump_pdu(const char *msg, Octstr *id, SMPP_PDU *pdu)
{
    debug("bb.sms.smpp", 0, "SMPP[%s]: %s",
          octstr_get_cstr(id), msg);
    smpp_pdu_dump(pdu);
}
#endif


/*
 * Some defaults.
 */

#define SMPP_ENQUIRE_LINK_INTERVAL  30.0
#define SMPP_MAX_PENDING_SUBMITS    10
#define SMPP_DEFAULT_VERSION        0x34
#define SMPP_DEFAULT_PRIORITY       0
#define SMPP_THROTTLING_SLEEP_TIME  15
#define SMPP_DEFAULT_CONNECTION_TIMEOUT  10 * SMPP_ENQUIRE_LINK_INTERVAL
#define SMPP_DEFAULT_WAITACK        60
#define SMPP_DEFAULT_SHUTDOWN_TIMEOUT 30


/* 
 * Some defines
 */
#define SMPP_WAITACK_RECONNECT      0x00
#define SMPP_WAITACK_REQUEUE        0x01
#define SMPP_WAITACK_NEVER_EXPIRE   0x02

/***********************************************************************
 * Implementation of the actual SMPP protocol: reading and writing
 * PDUs in the correct order.
 */


typedef struct {
    long transmitter;
    long receiver;
    List *msgs_to_send;
    Dict *sent_msgs; 
    List *received_msgs; 
    Counter *message_id_counter; 
    Octstr *host; 
    Octstr *system_type; 
    Octstr *username; 
    Octstr *password; 
    Octstr *address_range; 
    Octstr *my_number; 
    Octstr *service_type;
    int source_addr_ton; 
    int source_addr_npi; 
    int dest_addr_ton; 
    int dest_addr_npi;
    int transmit_port; 
    int receive_port; 
    int quitting; 
    long enquire_link_interval;
    long max_pending_submits;
    int version;
    int priority;       /* set default priority for messages */    
    time_t throttling_err_time;
    int smpp_msg_id_type;  /* msg id in C string, hex or decimal */
    int autodetect_addr;
    Octstr *alt_charset;
    long connection_timeout;
    long wait_ack;
    int wait_ack_action;
    SMSCConn *conn; 
} SMPP; 
 

struct smpp_msg {
    time_t sent_time;
    Msg *msg;
};


/*
 * create smpp_msg struct 
 */
static struct smpp_msg* smpp_msg_create(Msg *msg)
{
    struct smpp_msg *result = gw_malloc(sizeof(struct smpp_msg));
    
    gw_assert(result != NULL);
    result->sent_time = time(NULL);
    result->msg = msg;
                
    return result;
}


/*
 * destroy smpp_msg struct. If destroy_msg flag is set, then message will be freed as well
 */
static void smpp_msg_destroy(struct smpp_msg *msg, int destroy_msg)
{
    /* sanity check */
    if (msg == NULL)
        return;
                
    if (destroy_msg && msg->msg != NULL)
        msg_destroy(msg->msg);
                            
    gw_free(msg);
}

 
static SMPP *smpp_create(SMSCConn *conn, Octstr *host, int transmit_port,  
                   int receive_port, Octstr *system_type,  
                         Octstr *username, Octstr *password, 
                   Octstr *address_range,
                         int source_addr_ton, int source_addr_npi,  
                         int dest_addr_ton, int dest_addr_npi, 
                         int enquire_link_interval,
                         int max_pending_submits, int version, int priority,
                         Octstr *my_number, int smpp_msg_id_type, 
                         int autodetect_addr, Octstr *alt_charset, 
                         Octstr *service_type, long connection_timeout,
                         long wait_ack, int wait_ack_action) 
{ 
    SMPP *smpp; 
     
    smpp = gw_malloc(sizeof(*smpp)); 
    smpp->transmitter = -1; 
    smpp->receiver = -1; 
    smpp->msgs_to_send = list_create(); 
    smpp->sent_msgs = dict_create(max_pending_submits, NULL); 
    list_add_producer(smpp->msgs_to_send); 
    smpp->received_msgs = list_create(); 
    smpp->message_id_counter = counter_create(); 
    counter_increase(smpp->message_id_counter);
    smpp->host = octstr_duplicate(host); 
    smpp->system_type = octstr_duplicate(system_type); 
    smpp->username = octstr_duplicate(username); 
    smpp->password = octstr_duplicate(password); 
    smpp->address_range = octstr_duplicate(address_range); 
    smpp->source_addr_ton = source_addr_ton; 
    smpp->source_addr_npi = source_addr_npi; 
    smpp->dest_addr_ton = dest_addr_ton; 
    smpp->dest_addr_npi = dest_addr_npi; 
    smpp->my_number = octstr_duplicate(my_number); 
    smpp->service_type = octstr_duplicate(service_type);
    smpp->transmit_port = transmit_port; 
    smpp->receive_port = receive_port; 
    smpp->enquire_link_interval = enquire_link_interval;
    smpp->max_pending_submits = max_pending_submits; 
    smpp->quitting = 0; 
    smpp->version = version;
    smpp->priority = priority;
    smpp->conn = conn; 
    smpp->throttling_err_time = 0;
    smpp->smpp_msg_id_type = smpp_msg_id_type;    
    smpp->autodetect_addr = autodetect_addr;
    smpp->alt_charset = octstr_duplicate(alt_charset);
    smpp->connection_timeout = connection_timeout;
    smpp->wait_ack = wait_ack;
    smpp->wait_ack_action = wait_ack_action;
 
    return smpp; 
} 
 
 
static void smpp_destroy(SMPP *smpp) 
{ 
    if (smpp != NULL) { 
        list_destroy(smpp->msgs_to_send, msg_destroy_item); 
        dict_destroy(smpp->sent_msgs); 
        list_destroy(smpp->received_msgs, msg_destroy_item); 
        counter_destroy(smpp->message_id_counter); 
        octstr_destroy(smpp->host); 
        octstr_destroy(smpp->username); 
        octstr_destroy(smpp->password); 
        octstr_destroy(smpp->system_type); 
        octstr_destroy(smpp->service_type); 
        octstr_destroy(smpp->address_range); 
        octstr_destroy(smpp->my_number);
        octstr_destroy(smpp->alt_charset);
        gw_free(smpp); 
    } 
} 
 
 
/* 
 * Try to read an SMPP PDU from a Connection. Return -1 for error (caller 
 * should close the connection), 0 for no PDU to ready yet, or 1 for PDU 
 * read and unpacked. Return a pointer to the PDU in `*pdu'. Use `*len' 
 * to store the length of the PDU to read (it may be possible to read the 
 * length, but not the rest of the PDU - we need to remember the lenght 
 * for the next call). `*len' should be zero at the first call. 
 */
static int read_pdu(SMPP *smpp, Connection *conn, long *len, SMPP_PDU **pdu) 
{ 
    Octstr *os; 
 
    if (*len == 0) { 
        *len = smpp_pdu_read_len(conn); 
        if (*len == -1) { 
            error(0, "SMPP[%s]: Server sent garbage, ignored.",
                  octstr_get_cstr(smpp->conn->id)); 
            return -1; 
        } else if (*len == 0) { 
            if (conn_eof(conn) || conn_error(conn)) 
                return -1; 
            return 0; 
        } 
    } 
     
    os = smpp_pdu_read_data(conn, *len); 
    if (os == NULL) { 
        if (conn_eof(conn) || conn_error(conn)) 
            return -1; 
        return 0; 
    } 
    *len = 0; 
     
    *pdu = smpp_pdu_unpack(os); 
    if (*pdu == NULL) { 
        error(0, "SMPP[%s]: PDU unpacking failed.",
              octstr_get_cstr(smpp->conn->id)); 
        debug("bb.sms.smpp", 0, "SMPP[%s]: Failed PDU follows.",
              octstr_get_cstr(smpp->conn->id)); 
        octstr_dump(os, 0); 
        octstr_destroy(os);
        return -1;
    }

    octstr_destroy(os);
    return 1;
}


/*
 * Convert SMPP PDU to internal Msgs structure.
 * Return the Msg if all was fine and NULL otherwise, while getting 
 * the failing reason delivered back in *reason.
 * XXX semantical check on the incoming values can be extended here.
 */
static Msg *pdu_to_msg(SMPP *smpp, SMPP_PDU *pdu, long *reason)
{
    Msg *msg;
    int ton, npi;

    gw_assert(pdu->type == deliver_sm);

    msg = msg_create(sms);
    gw_assert(msg != NULL);
    *reason = SMPP_ESME_ROK;

    /* 
     * Reset source addr to have a prefixed '+' in case we have an 
     * intl. TON to allow backend boxes (ie. smsbox) to distinguish
     * between national and international numbers.
     */
    ton = pdu->u.deliver_sm.source_addr_ton;
    npi = pdu->u.deliver_sm.source_addr_npi;

    /* check if intl. and digit only; assume number is larger then 7 chars */
    if (ton == GSM_ADDR_TON_INTERNATIONAL &&
        octstr_len(pdu->u.deliver_sm.source_addr) >= 7 &&
        ((octstr_get_char(pdu->u.deliver_sm.source_addr, 0) == '+' &&
         octstr_check_range(pdu->u.deliver_sm.source_addr, 1, 256, gw_isdigit)) ||
        octstr_check_range(pdu->u.deliver_sm.source_addr, 0, 256, gw_isdigit))) {

        /* check if we received leading '00', then remove it*/
        if (octstr_search(pdu->u.deliver_sm.source_addr, octstr_imm("00"), 0) == 0)
            octstr_delete(pdu->u.deliver_sm.source_addr, 0, 2);

        /* international, insert '+' if not already here */
        if (octstr_get_char(pdu->u.deliver_sm.source_addr, 0) != '+')
            octstr_insert_char(pdu->u.deliver_sm.source_addr, 0, '+');
    } else if (octstr_len(pdu->u.deliver_sm.source_addr) > 11 &&
               (ton == GSM_ADDR_TON_ALPHANUMERIC ||
               !octstr_check_range(pdu->u.deliver_sm.source_addr, 0, 256, gw_isdigit))) {
        /* alphanum sender, max. allowed length is 11 (according to GSM specs) */
        *reason = SMPP_ESME_RINVSRCADR;
        goto error;
    }
    msg->sms.sender = pdu->u.deliver_sm.source_addr;
    pdu->u.deliver_sm.source_addr = NULL;

    /* 
     * Follows SMPP spec. v3.4. issue 1.2 
     * it's not allowed to have destination_addr NULL 
     */
    if (pdu->u.deliver_sm.destination_addr == NULL) {
        *reason = SMPP_ESME_RINVDSTADR;
        goto error;
    }

    /* Same reset of destination number as for source */
    ton = pdu->u.deliver_sm.dest_addr_ton;
    npi = pdu->u.deliver_sm.dest_addr_npi;

    /* check destination ton and destination addr */
    if (ton == GSM_ADDR_TON_INTERNATIONAL &&
        octstr_get_char(pdu->u.deliver_sm.destination_addr, 0) != '+') {

        /* check for leading '00' and delete them */
        if (octstr_search(pdu->u.deliver_sm.destination_addr, octstr_imm("00"), 0) == 0)
            octstr_delete(pdu->u.deliver_sm.destination_addr, 0, 2);
        /* add leading '+'*/
        octstr_insert_char(pdu->u.deliver_sm.destination_addr, 0, '+');
    }

    /* now check dest addr range */
    if (ton != GSM_ADDR_TON_ALPHANUMERIC && !octstr_check_range(pdu->u.deliver_sm.destination_addr, 1, 256, gw_isdigit)) {
        *reason = SMPP_ESME_RINVDSTADR;
        goto error;
    }
    msg->sms.receiver = pdu->u.deliver_sm.destination_addr;
    pdu->u.deliver_sm.destination_addr = NULL;

    /* SMSCs use service_type for billing information */
    msg->sms.binfo = pdu->u.deliver_sm.service_type;
    pdu->u.deliver_sm.service_type = NULL;

    if (pdu->u.deliver_sm.esm_class & ESM_CLASS_SUBMIT_RPI)
        msg->sms.rpi = 1;

    /*
     * Check for message_payload if version > 0x33 and sm_length == 0
     * Note: SMPP spec. v3.4. doesn't allow to send both: message_payload & short_message!
     */
    if (smpp->version > 0x33 && pdu->u.deliver_sm.sm_length == 0 && pdu->u.deliver_sm.message_payload) {
        msg->sms.msgdata = pdu->u.deliver_sm.message_payload;
        pdu->u.deliver_sm.message_payload = NULL;
    }
    else {
        msg->sms.msgdata = pdu->u.deliver_sm.short_message;
        pdu->u.deliver_sm.short_message = NULL;
    }

    /*
     * Encode udh if udhi set
     * for reference see GSM03.40, section 9.2.3.24
     */
    if (pdu->u.deliver_sm.esm_class & ESM_CLASS_SUBMIT_UDH_INDICATOR) {
        int udhl;
        udhl = octstr_get_char(msg->sms.msgdata, 0) + 1;
        debug("bb.sms.smpp",0,"SMPP[%s]: UDH length read as %d", 
              octstr_get_cstr(smpp->conn->id), udhl);
        if (udhl > octstr_len(msg->sms.msgdata)) {
            error(0, "SMPP[%s]: Mallformed UDH length indicator 0x%03x while message length "
                     "0x%03lx. Discarding MO message.", octstr_get_cstr(smpp->conn->id),
                     udhl, octstr_len(msg->sms.msgdata));
            *reason = SMPP_ESME_RINVESMCLASS;
            goto error;
        }
        msg->sms.udhdata = octstr_copy(msg->sms.msgdata, 0, udhl);
        octstr_delete(msg->sms.msgdata, 0, udhl);
    }

    dcs_to_fields(&msg, pdu->u.deliver_sm.data_coding);

    /* handle default data coding */
    switch (pdu->u.deliver_sm.data_coding) {
        case 0x00: /* default SMSC alphabet */
            /*
             * try to convert from something interesting if specified so
             * unless it was specified binary, ie. UDH indicator was detected
             */
            if (smpp->alt_charset && msg->sms.coding != DC_8BIT) {
                if (charset_convert(msg->sms.msgdata, octstr_get_cstr(smpp->alt_charset), "ISO-8859-1") != 0)
                    error(0, "Failed to convert msgdata from charset <%s> to <%s>, will leave as is.",
                             octstr_get_cstr(smpp->alt_charset), "ISO-8859-1");
                msg->sms.coding = DC_7BIT;
            } else { /* assume GSM 03.38 7-bit alphabet */
                charset_gsm_to_latin1(msg->sms.msgdata);
                msg->sms.coding = DC_7BIT;
            }
            break;
        case 0x01: /* ASCII or IA5 - not sure if I need to do anything */
        case 0x03: /* ISO-8859-1 - do nothing */
            msg->sms.coding = DC_7BIT; break;
        case 0x02: /* 8 bit binary - do nothing */
        case 0x04: /* 8 bit binary - do nothing */
            msg->sms.coding = DC_8BIT; break;
        case 0x05: /* JIS - what do I do with that ? */
            break;
        case 0x06: /* Cyrllic - iso-8859-5, I'll convert to unicode */
            if (charset_convert(msg->sms.msgdata, "ISO-8859-5", "UCS-2BE") != 0)
                error(0, "Failed to convert msgdata from cyrllic to UCS-2, will leave as is");
            msg->sms.coding = DC_UCS2; break;
        case 0x07: /* Hebrew iso-8859-8, I'll convert to unicode */
            if (charset_convert(msg->sms.msgdata, "ISO-8859-8", "UCS-2BE") != 0)
                error(0, "Failed to convert msgdata from hebrew to UCS-2, will leave as is");
            msg->sms.coding = DC_UCS2; break;
        case 0x08: /* unicode UCS-2, yey */
            msg->sms.coding = DC_UCS2; break;

            /*
             * don't much care about the others,
             * you implement them if you feel like it
             */

        default:
            /*
             * some of smsc send with dcs from GSM 03.38 , but these are reserved in smpp spec.
             * So we just look decoded values from dcs_to_fields and if none there make our assumptions.
             * if we have an UDH indicator, we assume DC_8BIT.
             */
            if (msg->sms.coding == DC_UNDEF && pdu->u.deliver_sm.esm_class & ESM_CLASS_SUBMIT_UDH_INDICATOR)
                msg->sms.coding = DC_8BIT;
            else if (msg->sms.coding == DC_7BIT || msg->sms.coding == DC_UNDEF) { /* assume GSM 7Bit , reencode */
                msg->sms.coding = DC_7BIT;
                charset_gsm_to_latin1(msg->sms.msgdata);
            }
    }
    msg->sms.pid = pdu->u.deliver_sm.protocol_id;

    /* set priority flag */
    msg->sms.priority = pdu->u.deliver_sm.priority_flag;

    return msg;

error:
    msg_destroy(msg);
    return NULL;
}


static long smpp_status_to_smscconn_failure_reason(long status)
{
    switch(status) {
        case SMPP_ESME_RMSGQFUL:
        case SMPP_ESME_RTHROTTLED:
        case SMPP_ESME_RX_T_APPN:
        case SMPP_ESME_RSYSERR:
            return SMSCCONN_FAILED_TEMPORARILY;
            break;

        default:
            return SMSCCONN_FAILED_REJECTED;
    }
}


static SMPP_PDU *msg_to_pdu(SMPP *smpp, Msg *msg)
{
    SMPP_PDU *pdu;
    Octstr *buffer;
    Octstr *relation_UTC_time = NULL;
    struct tm gmtime, localtime, tm;
    int gwqdiff;

    pdu = smpp_pdu_create(submit_sm,
                    counter_increase(smpp->message_id_counter));

    pdu->u.submit_sm.source_addr = octstr_duplicate(msg->sms.sender);
    pdu->u.submit_sm.destination_addr = octstr_duplicate(msg->sms.receiver);

    /* Set the service type of the outgoing message. We'll use the config 
     * directive as default and 'binfo' as specific parameter. */
    pdu->u.submit_sm.service_type = octstr_len(msg->sms.binfo) ? 
        octstr_duplicate(msg->sms.binfo) : octstr_duplicate(smpp->service_type);

    /* Check for manual override of source ton and npi values */
    if(smpp->source_addr_ton > -1 && smpp->source_addr_npi > -1) {
        pdu->u.submit_sm.source_addr_ton = smpp->source_addr_ton;
        pdu->u.submit_sm.source_addr_npi = smpp->source_addr_npi;
        debug("bb.sms.smpp", 0, "SMPP[%s]: Manually forced source addr ton = %d, source add npi = %d",
              octstr_get_cstr(smpp->conn->id), smpp->source_addr_ton,
              smpp->source_addr_npi);
    } else {
        /* setup default values */
        pdu->u.submit_sm.source_addr_ton = GSM_ADDR_TON_NATIONAL; /* national */
        pdu->u.submit_sm.source_addr_npi = GSM_ADDR_NPI_E164; /* ISDN number plan */
    }

    if (smpp->autodetect_addr) {
        /* lets see if its international or alphanumeric sender */
        if (octstr_get_char(pdu->u.submit_sm.source_addr, 0) == '+') {
            if (!octstr_check_range(pdu->u.submit_sm.source_addr, 1, 256, gw_isdigit)) {
                pdu->u.submit_sm.source_addr_ton = GSM_ADDR_TON_ALPHANUMERIC; /* alphanum */
                pdu->u.submit_sm.source_addr_npi = GSM_ADDR_NPI_UNKNOWN;    /* short code */
            } else {
               /* numeric sender address with + in front -> international (remove the +) */
               octstr_delete(pdu->u.submit_sm.source_addr, 0, 1);
               pdu->u.submit_sm.source_addr_ton = GSM_ADDR_TON_INTERNATIONAL;
          }
        } else {
            if (!octstr_check_range(pdu->u.submit_sm.source_addr,0, 256, gw_isdigit)) {
                pdu->u.submit_sm.source_addr_ton = GSM_ADDR_TON_ALPHANUMERIC;
                pdu->u.submit_sm.source_addr_npi = GSM_ADDR_NPI_UNKNOWN;
            }
        }
    }

    /* Check for manual override of destination ton and npi values */
    if (smpp->dest_addr_ton > -1 && smpp->dest_addr_npi > -1) {
        pdu->u.submit_sm.dest_addr_ton = smpp->dest_addr_ton;
        pdu->u.submit_sm.dest_addr_npi = smpp->dest_addr_npi;
        debug("bb.sms.smpp", 0, "SMPP[%s]: Manually forced dest addr ton = %d, dest add npi = %d",
              octstr_get_cstr(smpp->conn->id), smpp->dest_addr_ton,
              smpp->dest_addr_npi);
    } else {
        pdu->u.submit_sm.dest_addr_ton = GSM_ADDR_TON_NATIONAL; /* national */
        pdu->u.submit_sm.dest_addr_npi = GSM_ADDR_NPI_E164; /* ISDN number plan */
    }

    /*
     * if its a international number starting with +, lets remove the
     * '+' and set number type to international instead
     */
    if (octstr_get_char(pdu->u.submit_sm.destination_addr,0) == '+') {
        octstr_delete(pdu->u.submit_sm.destination_addr, 0,1);
        pdu->u.submit_sm.dest_addr_ton = GSM_ADDR_TON_INTERNATIONAL;
    }

    /* check length of src/dst address */
    if (octstr_len(pdu->u.submit_sm.destination_addr) > 20 ||
        octstr_len(pdu->u.submit_sm.source_addr) > 20) {
        smpp_pdu_destroy(pdu);
        return NULL;
    }

    /*
     * set the data coding scheme (DCS) field
     * check if we have a forced value for this from the smsc-group.
     * Note: if message class is set, then we _must_ force alt_dcs otherwise
     * dcs has reserved values (e.g. mclass=2, dcs=0x11). We check MWI flag
     * first here, because MWI and MCLASS can not be set at the same time and
     * function fields_to_dcs check MWI first, so we have no need to force alt_dcs
     * if MWI is set.
     */
    if (msg->sms.mwi == MWI_UNDEF && msg->sms.mclass != MC_UNDEF)
        pdu->u.deliver_sm.data_coding = fields_to_dcs(msg, 1); /* force alt_dcs */
    else
        pdu->u.submit_sm.data_coding = fields_to_dcs(msg,
            (msg->sms.alt_dcs != SMS_PARAM_UNDEFINED ?
             msg->sms.alt_dcs : smpp->conn->alt_dcs));

    /* set protocol id */
    if(msg->sms.pid != SMS_PARAM_UNDEFINED)
        pdu->u.submit_sm.protocol_id = msg->sms.pid;

    /*
     * set the esm_class field
     * default is store and forward, plus udh and rpi if requested
     */
    pdu->u.submit_sm.esm_class = ESM_CLASS_SUBMIT_STORE_AND_FORWARD_MODE;
    if (octstr_len(msg->sms.udhdata))
        pdu->u.submit_sm.esm_class = pdu->u.submit_sm.esm_class |
            ESM_CLASS_SUBMIT_UDH_INDICATOR;
    if (msg->sms.rpi > 0)
        pdu->u.submit_sm.esm_class = pdu->u.submit_sm.esm_class |
            ESM_CLASS_SUBMIT_RPI;

    /*
     * set data segments and length
     */

    pdu->u.submit_sm.short_message = octstr_duplicate(msg->sms.msgdata);

    /*
     * only re-encoding if using default smsc charset that is defined via
     * alt-charset in smsc group and if MT is not binary
     */
    if (msg->sms.coding == DC_7BIT || (msg->sms.coding == DC_UNDEF && octstr_len(msg->sms.udhdata))) {
        /* 
         * consider 3 cases: 
         *  a) data_coding 0xFX: encoding should always be GSM 03.38 charset 
         *  b) data_coding 0x00: encoding may be converted according to alt-charset 
         *  c) data_coding 0x00: assume GSM 03.38 charset if alt-charset is not defined
         */
        if ((pdu->u.submit_sm.data_coding & 0xF0) ||
            (!smpp->alt_charset && pdu->u.submit_sm.data_coding == 0)) {
            charset_latin1_to_gsm(pdu->u.submit_sm.short_message);
        }
        else if (pdu->u.submit_sm.data_coding == 0 && smpp->alt_charset) {
            /*
             * convert to the given alternative charset
             */
            if (charset_convert(pdu->u.submit_sm.short_message, "ISO-8859-1",
                                octstr_get_cstr(smpp->alt_charset)) != 0)
                error(0, "Failed to convert msgdata from charset <%s> to <%s>, will send as is.",
                             "ISO-8859-1", octstr_get_cstr(smpp->alt_charset));
        }
    }

    /* prepend udh if present */
    if (octstr_len(msg->sms.udhdata)) {
        octstr_insert(pdu->u.submit_sm.short_message, msg->sms.udhdata, 0);
    }

    pdu->u.submit_sm.sm_length = octstr_len(pdu->u.submit_sm.short_message);

    /*
     * check for validity and defered settings
     */
    if (msg->sms.validity >= 0 || msg->sms.deferred >= 0) {

        /* work out 1/4 hour difference between local time and UTC/GMT */
        gmtime = gw_gmtime(time(NULL));
        localtime = gw_localtime(time(NULL));
        gwqdiff = ((localtime.tm_hour - gmtime.tm_hour) * 4)
                  + ((localtime.tm_min - gmtime.tm_min) / 15);

        if (gwqdiff >= 0) {
            relation_UTC_time = octstr_create("+");
        } else {
            relation_UTC_time = octstr_create("-");
            gwqdiff *= -1;  /* make absolute */
        }

        if (msg->sms.validity >= 0) {
            tm = gw_localtime(time(NULL) + msg->sms.validity * 60);
            buffer = octstr_format("%02d%02d%02d%02d%02d%02d0%02d%1s",
                    tm.tm_year % 100, tm.tm_mon + 1, tm.tm_mday,
                    tm.tm_hour, tm.tm_min, tm.tm_sec,
                    gwqdiff, octstr_get_cstr(relation_UTC_time));
            pdu->u.submit_sm.validity_period = octstr_copy(buffer,0,16);
            octstr_destroy(buffer);
        }

        if (msg->sms.deferred >= 0) {
            tm = gw_localtime(time(NULL) + msg->sms.deferred * 60);
            buffer = octstr_format("%02d%02d%02d%02d%02d%02d0%02d%1s",
                    tm.tm_year % 100, tm.tm_mon + 1, tm.tm_mday,
                    tm.tm_hour, tm.tm_min, tm.tm_sec,
                    gwqdiff, octstr_get_cstr(relation_UTC_time));
            pdu->u.submit_sm.schedule_delivery_time = octstr_copy(buffer,0,16);
            octstr_destroy(buffer);
        }
    }

    /* ask for the delivery reports if needed */
    if (DLR_IS_SUCCESS_OR_FAIL(msg->sms.dlr_mask))
        pdu->u.submit_sm.registered_delivery = 1;
    else if (DLR_IS_FAIL(msg->sms.dlr_mask) && !DLR_IS_SUCCESS(msg->sms.dlr_mask))
        pdu->u.submit_sm.registered_delivery = 2;

    octstr_destroy(relation_UTC_time);

    /* set priority */
    if (msg->sms.priority >= 0 && msg->sms.priority <= 3)
        pdu->u.submit_sm.priority_flag = msg->sms.priority;
    else
        pdu->u.submit_sm.priority_flag = smpp->priority;

    /* set more messages to send */
    if (smpp->version > 0x33 && msg->sms.msg_left > 0)
        pdu->u.submit_sm.more_messages_to_send = 1;

    return pdu;
}


static void send_enquire_link(SMPP *smpp, Connection *conn, long *last_sent)
{
    SMPP_PDU *pdu;
    Octstr *os;

    if (date_universal_now() - *last_sent < smpp->enquire_link_interval)
        return;
    *last_sent = date_universal_now();

    pdu = smpp_pdu_create(enquire_link, counter_increase(smpp->message_id_counter));
    dump_pdu("Sending enquire link:", smpp->conn->id, pdu);
    os = smpp_pdu_pack(pdu);
    if (os)
      conn_write(conn, os); /* Write errors checked by caller. */
    octstr_destroy(os);
    smpp_pdu_destroy(pdu);
}


static void send_unbind(SMPP *smpp, Connection *conn)
{
    SMPP_PDU *pdu;
    Octstr *os;
    pdu = smpp_pdu_create(unbind, counter_increase(smpp->message_id_counter));
    dump_pdu("Sending unbind:", smpp->conn->id, pdu);
    os = smpp_pdu_pack(pdu);
    conn_write(conn, os);
    octstr_destroy(os);
    smpp_pdu_destroy(pdu);
}


static int send_pdu(Connection *conn, Octstr *id, SMPP_PDU *pdu)
{
    Octstr *os;
    int ret;

    dump_pdu("Sending PDU:", id, pdu);
    os = smpp_pdu_pack(pdu);
    if (os)
        ret = conn_write(conn, os);   /* Caller checks for write errors later */
    else
      ret = -1;
    octstr_destroy(os);
    return ret;
}


static void send_messages(SMPP *smpp, Connection *conn, long *pending_submits)
{
    Msg *msg;
    SMPP_PDU *pdu;
    Octstr *os;
    double delay = 0;

    if (*pending_submits == -1)
        return;

    if (smpp->conn->throughput > 0) {
        delay = 1.0 / smpp->conn->throughput;
    }

    while (*pending_submits < smpp->max_pending_submits) {
      /* Get next message, quit if none to be sent */
      msg = list_extract_first(smpp->msgs_to_send);
        if (msg == NULL)
            break;

        /* Send PDU, record it as waiting for ack from SMS center */
        pdu = msg_to_pdu(smpp, msg);
        if (pdu == NULL) {
            bb_smscconn_send_failed(smpp->conn, msg, SMSCCONN_FAILED_MALFORMED, octstr_create("MALFORMED SMS"));
            continue;
        }
        /* check for write errors */
        if (send_pdu(conn, smpp->conn->id, pdu) == 0) {
            struct smpp_msg *smpp_msg = smpp_msg_create(msg);
            os = octstr_format("%ld", pdu->u.submit_sm.sequence_number);
            dict_put(smpp->sent_msgs, os, smpp_msg);
            smpp_pdu_destroy(pdu);
            octstr_destroy(os);
            ++(*pending_submits);
            /*
             * obey throughput speed limit, if any.
             */
            if (smpp->conn->throughput)
                gwthread_sleep(delay);
        }
        else { /* write error occurs */
            smpp_pdu_destroy(pdu);
            bb_smscconn_send_failed(smpp->conn, msg, SMSCCONN_FAILED_TEMPORARILY, NULL);
            break;
        }
    }
}


/*
 * Open transmission connection to SMS center. Return NULL for error,
 * open Connection for OK. Caller must set smpp->conn->status correctly
 * before calling this.
 */
static Connection *open_transmitter(SMPP *smpp)
{ 
    SMPP_PDU *bind; 
    Connection *conn; 
 
    conn = conn_open_tcp(smpp->host, smpp->transmit_port, smpp->conn->our_host ); 
    if (conn == NULL) {
        error(0, "SMPP[%s]: Couldn't connect to server.",
              octstr_get_cstr(smpp->conn->id));
        return NULL; 
    } 
     
    bind = smpp_pdu_create(bind_transmitter, 
                counter_increase(smpp->message_id_counter)); 
    bind->u.bind_transmitter.system_id = octstr_duplicate(smpp->username); 
    bind->u.bind_transmitter.password = octstr_duplicate(smpp->password); 
    if (smpp->system_type == NULL) 
        bind->u.bind_transmitter.system_type = octstr_create("VMA"); 
    else 
        bind->u.bind_transmitter.system_type =  
             octstr_duplicate(smpp->system_type); 
    bind->u.bind_transmitter.interface_version = smpp->version;
    bind->u.bind_transmitter.address_range =  
      octstr_duplicate(smpp->address_range); 
    send_pdu(conn, smpp->conn->id, bind); 
    smpp_pdu_destroy(bind); 
 
    return conn; 
} 
 
 
/* 
 * Open transceiver connection to SMS center. Return NULL for error, 
 * open Connection for OK. Caller must set smpp->conn->status correctly 
 * before calling this. 
 */ 
static Connection *open_transceiver(SMPP *smpp) 
{ 
    SMPP_PDU *bind;
    Connection *conn; 
     
    conn = conn_open_tcp(smpp->host, smpp->transmit_port, smpp->conn->our_host ); 
    if (conn == NULL) {  
       error(0, "SMPP[%s]: Couldn't connect to server.",
             octstr_get_cstr(smpp->conn->id));
       return NULL; 
    } 
 
    bind = smpp_pdu_create(bind_transceiver, 
                           counter_increase(smpp->message_id_counter)); 
    bind->u.bind_transmitter.system_id = octstr_duplicate(smpp->username); 
    bind->u.bind_transmitter.password = octstr_duplicate(smpp->password); 
    if (smpp->system_type == NULL) 
        bind->u.bind_transmitter.system_type = octstr_create("VMA"); 
    else    
        bind->u.bind_transmitter.system_type = octstr_duplicate(smpp->system_type); 
    bind->u.bind_transmitter.interface_version = smpp->version;
    bind->u.bind_transmitter.address_range = octstr_duplicate(smpp->address_range); 
    send_pdu(conn, smpp->conn->id, bind); 
    smpp_pdu_destroy(bind); 
 
    return conn; 
} 
 
 
/* 
 * Open reception connection to SMS center. Return NULL for error,  
 * open Connection for OK. Caller must set smpp->conn->status correctly  
 * before calling this. 
 */ 
static Connection *open_receiver(SMPP *smpp)
{
    SMPP_PDU *bind;
    Connection *conn;

    conn = conn_open_tcp(smpp->host, smpp->receive_port, smpp->conn->our_host );
    if (conn == NULL) {
        error(0, "SMPP[%s]: Couldn't connect to server.",
              octstr_get_cstr(smpp->conn->id));
        return NULL;
    }

    bind = smpp_pdu_create(bind_receiver,
                counter_increase(smpp->message_id_counter));
    bind->u.bind_receiver.system_id = octstr_duplicate(smpp->username);
    bind->u.bind_receiver.password = octstr_duplicate(smpp->password);
    if (smpp->system_type == NULL)
        bind->u.bind_receiver.system_type = octstr_create("VMA");
    else
        bind->u.bind_receiver.system_type =
            octstr_duplicate(smpp->system_type);
    bind->u.bind_receiver.interface_version = smpp->version;
    bind->u.bind_receiver.address_range =
        octstr_duplicate(smpp->address_range);
    send_pdu(conn, smpp->conn->id, bind);
    smpp_pdu_destroy(bind);

    return conn;
}


static Msg *handle_dlr(SMPP *smpp, SMPP_PDU *pdu)
{
    Msg *dlrmsg = NULL;
    Octstr *respstr = NULL, *msgid = NULL, *tmp;
    int dlrstat = -1;
    
    /* first check for SMPP v3.4 and above */
    if (smpp->version > 0x33 && pdu->u.deliver_sm.receipted_message_id) {
        msgid = pdu->u.deliver_sm.receipted_message_id;
        pdu->u.deliver_sm.receipted_message_id = NULL;
        switch(pdu->u.deliver_sm.message_state) {
        case 1: /* ENROUTE */
        case 6: /* ACCEPTED */
            dlrstat = DLR_BUFFERED;
            break;
        case 2: /* DELIVERED */
            dlrstat = DLR_SUCCESS;
            break;
        case 3: /* EXPIRED */
        case 4: /* DELETED */
        case 5: /* UNDELIVERABLE */
        case 7: /* UNKNOWN */
        case 8: /* REJECTED */
            dlrstat = DLR_FAIL;
            break;
        default:
            warning(0, "SMPP[%s]: Got DLR with unknown 'message_state' (%ld).",
                octstr_get_cstr(smpp->conn->id), pdu->u.deliver_sm.message_state);
            dlrstat = DLR_FAIL;
            break;
        }
    }

    /* check for SMPP v.3.4. and message_payload */
    if (smpp->version > 0x33 && pdu->u.deliver_sm.sm_length == 0)
        respstr = pdu->u.deliver_sm.message_payload;
    else
        respstr = pdu->u.deliver_sm.short_message;
        
    /* still no msgid ? */
    if (!msgid && respstr) {
        long curr = 0, vpos = 0;
        Octstr *stat = NULL;
        char id_cstr[65], stat_cstr[16], sub_d_cstr[13], done_d_cstr[13];
        int sub, dlrvrd, ret;
    
        /* get server message id */
        /* first try sscanf way if thus failed then old way */
        ret = sscanf(octstr_get_cstr(respstr),
                    "id:%64[^s] sub:%d dlvrd:%d submit date:%12[0-9] done date:%12[0-9] stat:%10[^t^e]",
                    id_cstr, &sub, &dlrvrd, sub_d_cstr, done_d_cstr, stat_cstr);
        if (ret == 6) {
            msgid = octstr_create(id_cstr);
            octstr_strip_blanks(msgid);
            stat = octstr_create(stat_cstr);
            octstr_strip_blanks(stat);
        }
        else {
            debug("bb.sms.smpp", 0, "SMPP[%s]: Couldnot parse DLR string sscanf way,"
                "fallback to old way. Please report!", octstr_get_cstr(smpp->conn->id));
        
            if ((curr = octstr_search(respstr, octstr_imm("id:"), 0)) != -1) {
                vpos = octstr_search_char(respstr, ' ', curr);
                if ((vpos-curr >0) && (vpos != -1))
                    msgid = octstr_copy(respstr, curr+3, vpos-curr-3);
            } else {
                msgid = NULL;
            }

            /* get err & status code */
            if ((curr = octstr_search(respstr, octstr_imm("stat:"), 0)) != -1) {
                vpos = octstr_search_char(respstr, ' ', curr);
                if ((vpos-curr >0) && (vpos != -1))
                    stat = octstr_copy(respstr, curr+5, vpos-curr-5);
            } else {
                stat = NULL;
            }
        }
        
        /*
         * we get the following status:
         * DELIVRD, ACCEPTD, EXPIRED, DELETED, UNDELIV, UNKNOWN, REJECTD
         *
         * Note: some buggy SMSC's send us immediately delivery notifications although
         *          we doesn't requested these.
         */
        
        if (stat != NULL && octstr_compare(stat, octstr_imm("DELIVRD")) == 0)
            dlrstat = DLR_SUCCESS;
        else if (stat != NULL && (octstr_compare(stat, octstr_imm("ACCEPTD")) == 0 ||
                        octstr_compare(stat, octstr_imm("ACKED")) == 0 ||
                        octstr_compare(stat, octstr_imm("BUFFRED")) == 0 ||
                        octstr_compare(stat, octstr_imm("ENROUTE")) == 0))
            dlrstat = DLR_BUFFERED;
        else
            dlrstat = DLR_FAIL;
                
        if (stat != NULL)
            octstr_destroy(stat);
    }

    tmp = octstr_format("0");
    
    if (msgid != NULL) {

        /*
            * Obey which SMPP msg_id type this SMSC is using, where we
            * have the following semantics for the variable smpp_msg_id:
            *
            * bit 1: type for submit_sm_resp, bit 2: type for deliver_sm
            *
            * if bit is set value is hex otherwise dec
            *
            * 0x00 deliver_sm dec, submit_sm_resp dec
            * 0x01 deliver_sm dec, submit_sm_resp hex
            * 0x02 deliver_sm hex, submit_sm_resp dec
            * 0x03 deliver_sm hex, submit_sm_resp hex
            *
            * Default behaviour is SMPP spec compliant, which means
            * msg_ids should be C strings and hence non modified.
            */
        if (smpp->smpp_msg_id_type == -1) {
            /* the default, C string */
            tmp = octstr_duplicate(msgid);
        } else {
            if (smpp->smpp_msg_id_type & 0x02) {
                tmp = octstr_format("%ld", strtol(octstr_get_cstr(msgid), NULL, 16));
            } else {
                tmp = octstr_format("%ld", strtol(octstr_get_cstr(msgid), NULL, 10));
            }
        }

        dlrmsg = dlr_find(smpp->conn->id,
            tmp, /* smsc message id */
            pdu->u.deliver_sm.source_addr, /* destination */
            dlrstat);

        octstr_destroy(msgid);
    }
    
    if (dlrmsg != NULL) {
        /*
         * we found the delivery report in our storage, so recode the
         * message structure.
         * The DLR trigger URL is indicated by msg->sms.dlr_url.
         */
        dlrmsg->sms.msgdata = octstr_duplicate(respstr);
        dlrmsg->sms.sms_type = report_mo;
    } else {
        error(0,"SMPP[%s]: got DLR but could not find message or was not interested "
                "in it id<%s> dst<%s>, type<%d>",
                octstr_get_cstr(smpp->conn->id), octstr_get_cstr(tmp),
                octstr_get_cstr(pdu->u.deliver_sm.destination_addr), dlrstat);
    }
    octstr_destroy(tmp);
                
    return dlrmsg;
}


static void handle_pdu(SMPP *smpp, Connection *conn, SMPP_PDU *pdu,
                   long *pending_submits)
{
    SMPP_PDU *resp;
    Octstr *os;
    Msg *msg, *dlrmsg = NULL;
    long reason;
    long cmd_stat;
    struct smpp_msg *smpp_msg = NULL;

    resp = NULL;

    switch (pdu->type) {
        case deliver_sm:
          /*
             * If SMSCConn stopped then send temp. error code
           */
           mutex_lock(smpp->conn->flow_mutex);
           if (smpp->conn->is_stopped) {
                 mutex_unlock(smpp->conn->flow_mutex);
                 resp = smpp_pdu_create(deliver_sm_resp,
                               pdu->u.deliver_sm.sequence_number);
                 resp->u.deliver_sm.command_status = SMPP_ESME_RX_T_APPN;
               break;
             }
             mutex_unlock(smpp->conn->flow_mutex);

            /*
             * bb_smscconn_receive can fail, but we ignore that since we
             * have no useful way to tell the SMS center about this
             * (no suitable error code for the deliver_sm_resp is defined)
             */

            /* got a deliver ack (DLR)?
           * NOTE: following SMPP v3.4. spec. we are interested
           *       only on bits 2-5 (some SMSC's send 0x44, and it's
           *       spec. conforme)
           */
            if (pdu->u.deliver_sm.esm_class & (0x04|0x08)) {

                debug("bb.sms.smpp",0,"SMPP[%s] handle_pdu, got DLR",
                      octstr_get_cstr(smpp->conn->id));

                dlrmsg = handle_dlr(smpp, pdu);
                resp = smpp_pdu_create(deliver_sm_resp,
                            pdu->u.deliver_sm.sequence_number);
                if (dlrmsg != NULL)
                    reason = bb_smscconn_receive(smpp->conn, dlrmsg);
                else
                    reason = SMSCCONN_SUCCESS;
                switch(reason) {
                    case SMSCCONN_SUCCESS:
                        resp->u.deliver_sm_resp.command_status = SMPP_ESME_ROK;
                        break;
                    case SMSCCONN_FAILED_REJECTED:
                        resp->u.deliver_sm_resp.command_status = SMPP_ESME_RX_R_APPN;
                        break;
                    default:
                        resp->u.deliver_sm_resp.command_status = SMPP_ESME_RX_T_APPN;
                        break;
                }

            } else /* MO-SMS */
            {
                resp = smpp_pdu_create(deliver_sm_resp,
                            pdu->u.deliver_sm.sequence_number);
                /* ensure the smsc-id is set */
                msg = pdu_to_msg(smpp, pdu, &reason);
                if (msg == NULL) {
                    resp->u.deliver_sm_resp.command_status = reason;
                    break;
                }

                /* Replace MO destination number with my-number */
                if (octstr_len(smpp->my_number)) {
                    octstr_destroy(msg->sms.receiver);
                    msg->sms.receiver = octstr_duplicate(smpp->my_number);
                }

                time(&msg->sms.time);
                msg->sms.smsc_id = octstr_duplicate(smpp->conn->id);
                reason =  bb_smscconn_receive(smpp->conn, msg);
                switch(reason) {
                    case SMSCCONN_SUCCESS:
                        resp->u.deliver_sm_resp.command_status = SMPP_ESME_ROK;
                        break;
                    case SMSCCONN_FAILED_REJECTED:
                        resp->u.deliver_sm_resp.command_status = SMPP_ESME_RX_R_APPN;
                        break;
                    default:
                        resp->u.deliver_sm_resp.command_status = SMPP_ESME_RX_T_APPN;
                        break;
                }
            }
            break;

        case enquire_link:
            resp = smpp_pdu_create(enquire_link_resp,
                        pdu->u.enquire_link.sequence_number);
            break;

        case enquire_link_resp:
            break;

        case submit_sm_resp:
            os = octstr_format("%ld", pdu->u.submit_sm_resp.sequence_number);
            smpp_msg = dict_remove(smpp->sent_msgs, os);
            octstr_destroy(os);
            if (smpp_msg == NULL) {
                warning(0, "SMPP[%s]: SMSC sent submit_sm_resp "
                        "with wrong sequence number 0x%08lx",
                        octstr_get_cstr(smpp->conn->id),
                        pdu->u.submit_sm_resp.sequence_number);
                break;
            }
            msg = smpp_msg->msg;
            smpp_msg_destroy(smpp_msg, 0);
            if (pdu->u.submit_sm_resp.command_status != 0) {
                error(0, "SMPP[%s]: SMSC returned error code 0x%08lx (%s) "
                      "in response to submit_sm.",
                      octstr_get_cstr(smpp->conn->id),
                      pdu->u.submit_sm_resp.command_status,
                  smpp_error_to_string(pdu->u.submit_sm_resp.command_status));
                reason = smpp_status_to_smscconn_failure_reason(
                            pdu->u.submit_sm_resp.command_status);

                /*
                 * check to see if we got a "throttling error", in which case we'll just
                 * sleep for a while
                 */
                if (pdu->u.submit_sm_resp.command_status == SMPP_ESME_RTHROTTLED)
                    time(&(smpp->throttling_err_time));
                else
                    smpp->throttling_err_time = 0;

                bb_smscconn_send_failed(smpp->conn, msg, reason, 
                        octstr_format("%ld/%s", pdu->u.submit_sm_resp.command_status,
                            smpp_error_to_string(pdu->u.submit_sm_resp.command_status)));
                --(*pending_submits);
            } else {
                Octstr *tmp;

                /* check if msg_id is C string, decimal or hex for this SMSC */
                if (smpp->smpp_msg_id_type == -1) {
                    /* the default, C string */
                    tmp = octstr_duplicate(pdu->u.submit_sm_resp.message_id);
                } else {
                    if (smpp->smpp_msg_id_type & 0x01) {
                        tmp = octstr_format("%ld", strtol(  /* hex */
                            octstr_get_cstr(pdu->u.submit_sm_resp.message_id), NULL, 16));
                    } else {
                        tmp = octstr_format("%ld", strtol(  /* decimal */
                            octstr_get_cstr(pdu->u.submit_sm_resp.message_id), NULL, 10));
                    }
                }

                /* SMSC ACK.. now we have the message id. */
                if (DLR_IS_ENABLED_DEVICE(msg->sms.dlr_mask))
                    dlr_add(smpp->conn->id, tmp, msg);

                octstr_destroy(tmp);
                bb_smscconn_sent(smpp->conn, msg, NULL);
                --(*pending_submits);
            } /* end if for SMSC ACK */
            break;

        case bind_transmitter_resp:
            if (pdu->u.bind_transmitter_resp.command_status != 0) {
                error(0, "SMPP[%s]: SMSC rejected login to transmit, "
                          "code 0x%08lx (%s).",
                      octstr_get_cstr(smpp->conn->id),
                      pdu->u.bind_transmitter_resp.command_status,
                  smpp_error_to_string(pdu->u.bind_transmitter_resp.command_status));
                if (pdu->u.bind_transmitter_resp.command_status == SMPP_ESME_RINVSYSID ||
                    pdu->u.bind_transmitter_resp.command_status == SMPP_ESME_RINVPASWD)
                    smpp->quitting = 1;
            } else {
                *pending_submits = 0;
                mutex_lock(smpp->conn->flow_mutex);
                smpp->conn->status = SMSCCONN_ACTIVE;
                smpp->conn->connect_time = time(NULL);
                mutex_unlock(smpp->conn->flow_mutex);
                bb_smscconn_connected(smpp->conn);
            }
            break;

        case bind_transceiver_resp:
            if (pdu->u.bind_transceiver_resp.command_status != 0) {
                error(0, "SMPP[%s]: SMSC rejected login to transmit, "
                      "code 0x%08lx (%s).",
                      octstr_get_cstr(smpp->conn->id),
                      pdu->u.bind_transceiver_resp.command_status,
                  smpp_error_to_string(pdu->u.bind_transceiver_resp.command_status));
                if (pdu->u.bind_transceiver_resp.command_status == SMPP_ESME_RINVSYSID ||
                    pdu->u.bind_transceiver_resp.command_status == SMPP_ESME_RINVPASWD)
                    smpp->quitting = 1;
            } else {
                *pending_submits = 0;
                mutex_lock(smpp->conn->flow_mutex);
                smpp->conn->status = SMSCCONN_ACTIVE;
                smpp->conn->connect_time = time(NULL);
                mutex_unlock(smpp->conn->flow_mutex);
                bb_smscconn_connected(smpp->conn);
            }
            break;

        case bind_receiver_resp:
            if (pdu->u.bind_receiver_resp.command_status != 0) {
                error(0, "SMPP[%s]: SMSC rejected login to receive, "
                      "code 0x%08lx (%s).",
                      octstr_get_cstr(smpp->conn->id),
                      pdu->u.bind_receiver_resp.command_status,
                  smpp_error_to_string(pdu->u.bind_receiver_resp.command_status));
                if (pdu->u.bind_receiver_resp.command_status == SMPP_ESME_RINVSYSID ||
                    pdu->u.bind_receiver_resp.command_status == SMPP_ESME_RINVPASWD)
                    smpp->quitting = 1;
            } else {
                /* set only resceive status if no transmitt is bind */
                mutex_lock(smpp->conn->flow_mutex);
                if (smpp->conn->status != SMSCCONN_ACTIVE) {
                    smpp->conn->status = SMSCCONN_ACTIVE_RECV;
                    smpp->conn->connect_time = time(NULL);
                }
                mutex_unlock(smpp->conn->flow_mutex);
            }
            break;

        case unbind:
            resp = smpp_pdu_create(unbind_resp, pdu->u.unbind.sequence_number);
            mutex_lock(smpp->conn->flow_mutex);
            smpp->conn->status = SMSCCONN_DISCONNECTED;
            mutex_unlock(smpp->conn->flow_mutex);
            break;

        case unbind_resp:
            mutex_lock(smpp->conn->flow_mutex);
            smpp->conn->status = SMSCCONN_DISCONNECTED;
            mutex_unlock(smpp->conn->flow_mutex);
            break;

        case generic_nack:
            cmd_stat  = pdu->u.generic_nack.command_status;

            os = octstr_format("%ld", pdu->u.generic_nack.sequence_number);
            smpp_msg = dict_remove(smpp->sent_msgs, os);
            octstr_destroy(os);

            if (smpp_msg == NULL) {
                error(0, "SMPP[%s]: SMSC rejected last command"
                  "code 0x%08lx (%s).",
                      octstr_get_cstr(smpp->conn->id),
                      cmd_stat,
                  smpp_error_to_string(cmd_stat));
            } else {
                msg = smpp_msg->msg;
                smpp_msg_destroy(smpp_msg, 0);
                
                error(0, "SMPP[%s]: SMSC returned error code 0x%08lx (%s) "
                      "in response to submit_sm.",
                      octstr_get_cstr(smpp->conn->id),
                      cmd_stat,
                  smpp_error_to_string(cmd_stat));

                /*
                 * check to see if we got a "throttling error", in which case we'll just
                 * sleep for a while
                 */
                if (cmd_stat == SMPP_ESME_RTHROTTLED)
                    time(&(smpp->throttling_err_time));
                else
                    smpp->throttling_err_time = 0;

            reason = smpp_status_to_smscconn_failure_reason(cmd_stat);
                bb_smscconn_send_failed(smpp->conn, msg, reason,
                    octstr_format("%ld/%s", cmd_stat, smpp_error_to_string(cmd_stat)));
                --(*pending_submits);
            }
            break;
        default:
            error(0, "SMPP[%s]: Unknown PDU type 0x%08lx, ignored.",
                  octstr_get_cstr(smpp->conn->id), pdu->type);
            /*
                send gnack , see smpp3.4 spec., section 3.3
                because we doesn't know what kind of pdu received, we assume generick_nack_resp
                (header always the same)
            */
            resp = smpp_pdu_create(generic_nack, pdu->u.generic_nack.sequence_number);
            resp->u.generic_nack.command_status = SMPP_ESME_RINVCMDID;
            break;
    }

    if (resp != NULL) {
      send_pdu(conn, smpp->conn->id, resp);
        smpp_pdu_destroy(resp);
    }
}


struct io_arg {
    SMPP *smpp;
    int transmitter;
};


static struct io_arg *io_arg_create(SMPP *smpp, int transmitter)
{
    struct io_arg *io_arg;

    io_arg = gw_malloc(sizeof(*io_arg));
    io_arg->smpp = smpp;
    io_arg->transmitter = transmitter;
    return io_arg;
}


/* 
 * sent queue cleanup.
 * @return 1 if io_thread should reconnect; 0 if not
 */
static int do_queue_cleanup(SMPP *smpp, long *pending_submits, int action)
{
    List *keys;
    Octstr *key;
    struct smpp_msg *smpp_msg;
    time_t now = time(NULL);
                
    if (*pending_submits <= 0)
        return 0;

    /* check if action set to wait ack for ever */
    if (action == SMPP_WAITACK_NEVER_EXPIRE)
        return 0;
                            
    keys = dict_keys(smpp->sent_msgs);
    if (keys == NULL)
        return 0;
                                            
    while ((key = list_extract_first(keys)) != NULL) {
        smpp_msg = dict_get(smpp->sent_msgs, key);
        if (smpp_msg != NULL && difftime(now, smpp_msg->sent_time) > smpp->wait_ack) {
            switch(action) {
                case SMPP_WAITACK_RECONNECT: /* reconnect */
                    /* found at least one not acked msg */
                    warning(0, "SMPP[%s]: Not ACKED message found, reconnecting.",
                                   octstr_get_cstr(smpp->conn->id));
                    octstr_destroy(key);
                    list_destroy(keys, octstr_destroy_item);
                    return 1; /* io_thread will reconnect */
                case SMPP_WAITACK_REQUEUE: /* requeue */
                    smpp_msg = dict_remove(smpp->sent_msgs, key);
                    if (smpp_msg != NULL) {
                        warning(0, "SMPP[%s]: Not ACKED message found, will retransmit."
                                   " SENT<%ld>sec. ago, SEQ<%s>, DST<%s>",
                                   octstr_get_cstr(smpp->conn->id),
                                   (long)difftime(now, smpp_msg->sent_time) ,
                                   octstr_get_cstr(key),
                                   octstr_get_cstr(smpp_msg->msg->sms.receiver));
                        bb_smscconn_send_failed(smpp->conn, smpp_msg->msg, SMSCCONN_FAILED_TEMPORARILY,NULL);
                        smpp_msg_destroy(smpp_msg, 0);
                        (*pending_submits)--;
                    }
                default:
                    error(0, "SMPP[%s] Unknown clenup action defined %xd.",
                             octstr_get_cstr(smpp->conn->id), action);
                    octstr_destroy(key);
                    list_destroy(keys, octstr_destroy_item);
                    return 0;
            }
        }
        octstr_destroy(key);
    }
    list_destroy(keys, octstr_destroy_item);

    return 0;
}


/*
 * This is the main function for the background thread for doing I/O on
 * one SMPP connection (the one for transmitting or receiving messages).
 * It makes the initial connection to the SMPP server and re-connects
 * if there are I/O errors or other errors that require it.
 */
static void io_thread(void *arg)
{
    SMPP *smpp;
    struct io_arg *io_arg;
    int transmitter;
    Connection *conn;
    int ret;
    long last_enquire_sent;
    long pending_submits;
    long len;
    SMPP_PDU *pdu;
    double timeout;
    time_t last_response, last_cleanup;

    io_arg = arg;
    smpp = io_arg->smpp;
    transmitter = io_arg->transmitter;
    gw_free(io_arg);

    /* Make sure we log into our own log-file if defined */
    log_thread_to(smpp->conn->log_idx);

    conn = NULL;
    while (!smpp->quitting) {
        if (transmitter == 1)
            conn = open_transmitter(smpp);
        else if (transmitter == 2)
            conn = open_transceiver(smpp);
        else
            conn = open_receiver(smpp);

        last_enquire_sent = last_cleanup = last_response = date_universal_now();
        pending_submits = -1;
        len = 0;
        smpp->throttling_err_time = 0;
        for (;conn != NULL;) {
            timeout = last_enquire_sent + smpp->enquire_link_interval
                        - date_universal_now();

            if (conn_wait(conn, timeout) == -1)
                break;

            /* unbind
             * Read so long as unbind_resp received or timeout passed. Otherwise we have
             * double delivered messages.
             */
            if (smpp->quitting) {
                send_unbind(smpp, conn);
                last_response = time(NULL);
                while(conn_wait(conn, 1.00) != -1 &&
                      difftime(time(NULL), last_response) < SMPP_DEFAULT_SHUTDOWN_TIMEOUT &&
                      smpp->conn->status != SMSCCONN_DISCONNECTED) {
                    if (read_pdu(smpp, conn, &len, &pdu) == 1) {
                        dump_pdu("Got PDU:", smpp->conn->id, pdu);
                        handle_pdu(smpp, conn, pdu, &pending_submits);
                        smpp_pdu_destroy(pdu);
                    }
                }
                debug("bb.sms.smpp", 0, "SMPP[%s]: %s: break and shutting down",
                      octstr_get_cstr(smpp->conn->id), __PRETTY_FUNCTION__);

                break;
            }

            send_enquire_link(smpp, conn, &last_enquire_sent);

            while ((ret = read_pdu(smpp, conn, &len, &pdu)) == 1) {
                last_response = time(NULL);
                /* Deal with the PDU we just got */
                dump_pdu("Got PDU:", smpp->conn->id, pdu);
                handle_pdu(smpp, conn, pdu, &pending_submits);
                smpp_pdu_destroy(pdu);

                /*
                 * check if we are still connected.
                 * Note: smsc can send unbind request, so we must check it.
                 */
                if (smpp->conn->status != SMSCCONN_ACTIVE && smpp->conn->status != SMSCCONN_ACTIVE_RECV) {
                     /* we are disconnected */
                     ret = -1;
                     break;
                }

                /* Make sure we send enquire_link even if we read a lot */
                send_enquire_link(smpp, conn, &last_enquire_sent);

                /* Make sure we send even if we read a lot */
                if (transmitter && difftime(time(NULL), smpp->throttling_err_time) > SMPP_THROTTLING_SLEEP_TIME) {
                    smpp->throttling_err_time = 0;
                    send_messages(smpp, conn, &pending_submits);
                }
            }

            if (ret == -1) {
                error(0, "SMPP[%s]: I/O error or other error. Re-connecting.",
                      octstr_get_cstr(smpp->conn->id));
                break;
            }
            
            /* if no PDU was received and connection timeout was set and over the limit */
            if (ret == 0 && smpp->connection_timeout > 0 &&
                difftime(time(NULL), last_response) > smpp->connection_timeout) {
                error(0, "SMPP[%s]: No responses from SMSC within %ld sec. Reconnecting.",
                         octstr_get_cstr(smpp->conn->id), smpp->connection_timeout);
                break;
            }


            /* cleanup sent queue */
            if (transmitter && difftime(time(NULL), last_cleanup) > smpp->wait_ack) {
                if (do_queue_cleanup(smpp, &pending_submits, smpp->wait_ack_action))
                    break; /* reconnect */
                last_cleanup = time(NULL);
            }
                                                                    
            if (transmitter && difftime(time(NULL), smpp->throttling_err_time) > SMPP_THROTTLING_SLEEP_TIME) {
                smpp->throttling_err_time = 0;
                send_messages(smpp, conn, &pending_submits);
            }
        }

        if (conn != NULL) {
            conn_destroy(conn);
            conn = NULL;
        }
        /*
         * Put all queued messages back into global queue,so if
         * we have another link running then messages will be delivered
         * quickly.
         */
        if (transmitter) {
            Msg *msg;
            struct smpp_msg *smpp_msg;
            List *noresp;
            Octstr *key;

            long reason = (smpp->quitting?SMSCCONN_FAILED_SHUTDOWN:SMSCCONN_FAILED_TEMPORARILY);

            while((msg = list_extract_first(smpp->msgs_to_send)) != NULL)
                bb_smscconn_send_failed(smpp->conn, msg, reason, NULL);

            noresp = dict_keys(smpp->sent_msgs);
            while((key = list_extract_first(noresp)) != NULL) {
                smpp_msg = dict_remove(smpp->sent_msgs, key);
                if (smpp_msg != NULL && smpp_msg->msg) {
                    bb_smscconn_send_failed(smpp->conn, smpp_msg->msg, reason, NULL);
                    smpp_msg_destroy(smpp_msg, 0);
                }
                octstr_destroy(key);
            }
            list_destroy(noresp, NULL);
        }
        /*
         * Reconnect if that was a connection problem.
         */
        if (!smpp->quitting) {
            error(0, "SMPP[%s]: Couldn't connect to SMS center (retrying in %ld seconds).",
                  octstr_get_cstr(smpp->conn->id), smpp->conn->reconnect_delay);
            mutex_lock(smpp->conn->flow_mutex);
            smpp->conn->status = SMSCCONN_RECONNECTING;
            mutex_unlock(smpp->conn->flow_mutex);
            gwthread_sleep(smpp->conn->reconnect_delay);
        }
    }
}


/***********************************************************************
 * Functions called by smscconn.c via the SMSCConn function pointers.
 */


static long queued_cb(SMSCConn *conn)
{
    SMPP *smpp;

    smpp = conn->data;
    conn->load = (smpp ? (conn->status != SMSCCONN_DEAD ?
                  list_len(smpp->msgs_to_send) : 0) : 0);
    return conn->load;
}


static int send_msg_cb(SMSCConn *conn, Msg *msg)
{
    SMPP *smpp;

    smpp = conn->data;
    list_produce(smpp->msgs_to_send, msg_duplicate(msg));
    gwthread_wakeup(smpp->transmitter);
    return 0;
}


static int shutdown_cb(SMSCConn *conn, int finish_sending)
{
    SMPP *smpp;

    debug("bb.smpp", 0, "Shutting down SMSCConn %s (%s)",
          octstr_get_cstr(conn->name),
          finish_sending ? "slow" : "instant");

    conn->why_killed = SMSCCONN_KILLED_SHUTDOWN;

    /* XXX implement finish_sending */

    smpp = conn->data;
    smpp->quitting = 1;
    if (smpp->transmitter != -1) {
        gwthread_wakeup(smpp->transmitter);
        gwthread_join(smpp->transmitter);
    }
    if (smpp->receiver != -1) {
        gwthread_wakeup(smpp->receiver);
        gwthread_join(smpp->receiver);
    }
    smpp_destroy(smpp);

    debug("bb.smpp", 0, "SMSCConn %s shut down.",
          octstr_get_cstr(conn->name));
    conn->status = SMSCCONN_DEAD;
    bb_smscconn_killed();
    return 0;
}


/***********************************************************************
 * Public interface. This version is suitable for the Kannel bearerbox
 * SMSCConn interface.
 */


int smsc_smpp_create(SMSCConn *conn, CfgGroup *grp)
{
    Octstr *host;
    long port;
    long receive_port;
    Octstr *username;
    Octstr *password;
    Octstr *system_id;
    Octstr *system_type;
    Octstr *address_range;
    long source_addr_ton;
    long source_addr_npi;
    long dest_addr_ton;
    long dest_addr_npi;
    Octstr *my_number;
    Octstr *service_type;
    SMPP *smpp;
    int ok;
    int transceiver_mode;
    Octstr *smsc_id;
    long enquire_link_interval;
    long max_pending_submits;
    long version;
    long priority;
    long smpp_msg_id_type;
    int autodetect_addr;
    Octstr *alt_charset;
    long connection_timeout, wait_ack, wait_ack_action;

    my_number = alt_charset = NULL;
    transceiver_mode = 0;
    autodetect_addr = 1;
 
    host = cfg_get(grp, octstr_imm("host")); 
    if (cfg_get_integer(&port, grp, octstr_imm("port")) == -1) 
        port = 0; 
    if (cfg_get_integer(&receive_port, grp, octstr_imm("receive-port")) == -1) 
        receive_port = 0; 
    cfg_get_bool(&transceiver_mode, grp, octstr_imm("transceiver-mode")); 
    username = cfg_get(grp, octstr_imm("smsc-username")); 
    password = cfg_get(grp, octstr_imm("smsc-password")); 
    system_type = cfg_get(grp, octstr_imm("system-type")); 
    address_range = cfg_get(grp, octstr_imm("address-range")); 
    my_number = cfg_get(grp, octstr_imm("my-number")); 
    service_type = cfg_get(grp, octstr_imm("service-type")); 
     
    system_id = cfg_get(grp, octstr_imm("system-id")); 
    if (system_id != NULL) { 
        warning(0, "SMPP: obsolete system-id variable is set, " 
               "use smsc-username instead."); 
        if (username == NULL) { 
            warning(0, "SMPP: smsc-username not set, using system-id instead"); 
            username = system_id; 
        } else 
            octstr_destroy(system_id); 
    } 

    /* 
     * check if timing values have been configured, otherwise
     * use the predefined default values.
     */
    if (cfg_get_integer(&enquire_link_interval, grp, 
                        octstr_imm("enquire-link-interval")) == -1)
        enquire_link_interval = SMPP_ENQUIRE_LINK_INTERVAL;
    if (cfg_get_integer(&max_pending_submits, grp, 
                        octstr_imm("max-pending-submits")) == -1)
        max_pending_submits = SMPP_MAX_PENDING_SUBMITS;
 
    /* Check that config is OK */ 
    ok = 1; 
    if (host == NULL) { 
        error(0,"SMPP: Configuration file doesn't specify host"); 
        ok = 0; 
    }     
    if (username == NULL) { 
          error(0, "SMPP: Configuration file doesn't specify username."); 
          ok = 0; 
    } 
    if (password == NULL) { 
          error(0, "SMPP: Configuration file doesn't specify password."); 
          ok = 0; 
    } 
    if (system_type == NULL) { 
          error(0, "SMPP: Configuration file doesn't specify system-type."); 
          ok = 0; 
    } 
    if (octstr_len(service_type) > 6) {
            error(0, "SMPP: Service type must be 6 characters or less.");
            ok = 0;
    }

    if (!ok) 
        return -1; 
 
    /* if the ton and npi values are forced, set them, else set them to -1 */ 
    if (cfg_get_integer(&source_addr_ton, grp, 
                        octstr_imm("source-addr-ton")) == -1) 
        source_addr_ton = -1; 
    if (cfg_get_integer(&source_addr_npi, grp, 
                        octstr_imm("source-addr-npi")) == -1) 
        source_addr_npi = -1; 
    if (cfg_get_integer(&dest_addr_ton, grp, 
                        octstr_imm("dest-addr-ton")) == -1) 
        dest_addr_ton = -1; 
    if (cfg_get_integer(&dest_addr_npi, grp, 
                        octstr_imm("dest-addr-npi")) == -1) 
        dest_addr_npi = -1; 

    /* if source addr autodetection should be used set this to 1 */
    if (cfg_get_bool(&autodetect_addr, grp, octstr_imm("source-addr-autodetect")) == -1)
        autodetect_addr = 1; /* default is autodetect if no option defined */

    /* check for any specified interface version */
    if (cfg_get_integer(&version, grp, octstr_imm("interface-version")) == -1)
        version = SMPP_DEFAULT_VERSION;
    else
        /* convert decimal to BCD */
        version = ((version / 10) << 4) + (version % 10);

    /* check for any specified priority value in range [0-5] */
    if (cfg_get_integer(&priority, grp, octstr_imm("priority")) == -1)
        priority = SMPP_DEFAULT_PRIORITY;
    else if (priority < 0 || priority > 3)
        panic(0, "SMPP: Invalid value for priority directive in configuraton (allowed range 0-3).");

    /* set the msg_id type variable for this SMSC */
    if (cfg_get_integer(&smpp_msg_id_type, grp, octstr_imm("msg-id-type")) == -1) {
        /* 
         * defaults to C string "as-is" style 
         */
        smpp_msg_id_type = -1; 
    } else {
        if (smpp_msg_id_type < 0 || smpp_msg_id_type > 3)
            panic(0,"SMPP: Invalid value for msg-id-type directive in configuraton"); 
    }

    /* check for an alternative charset */
    alt_charset = cfg_get(grp, octstr_imm("alt-charset"));
    
    /* check for connection timeout */
    if (cfg_get_integer(&connection_timeout, grp, octstr_imm("connection-timeout")) == -1)
        connection_timeout = SMPP_DEFAULT_CONNECTION_TIMEOUT;

    /* check if wait-ack timeout set */
    if (cfg_get_integer(&wait_ack, grp, octstr_imm("wait-ack")) == -1)
        wait_ack = SMPP_DEFAULT_WAITACK;

    if (cfg_get_integer(&wait_ack_action, grp, octstr_imm("wait-ack-expire")) == -1)
        wait_ack_action = SMPP_WAITACK_REQUEUE;
        
    if (wait_ack_action > 0x03 || wait_ack_action < 0)
        panic(0, "SMPP: Invalid wait-ack-expire directive in configuration.");

    smpp = smpp_create(conn, host, port, receive_port, system_type,  
                   username, password, address_range,
                       source_addr_ton, source_addr_npi, dest_addr_ton,  
                       dest_addr_npi, enquire_link_interval, 
                       max_pending_submits, version, priority, my_number, 
                       smpp_msg_id_type, autodetect_addr, alt_charset, 
                       service_type, connection_timeout, wait_ack, wait_ack_action); 
 
    conn->data = smpp; 
    conn->name = octstr_format("SMPP:%S:%d/%d:%S:%S",  
                         host, port, 
                               (receive_port ? receive_port : port),  
                               username, system_type); 
 
    smsc_id = cfg_get(grp, octstr_imm("smsc-id")); 
    if (smsc_id == NULL) { 
        conn->id = octstr_duplicate(conn->name); 
    } 

    octstr_destroy(host); 
    octstr_destroy(username); 
    octstr_destroy(password); 
    octstr_destroy(system_type); 
    octstr_destroy(address_range); 
    octstr_destroy(my_number); 
    octstr_destroy(smsc_id);
    octstr_destroy(alt_charset); 
    octstr_destroy(service_type);

    conn->status = SMSCCONN_CONNECTING; 
       
    /* 
     * I/O threads are only started if the corresponding ports 
     * have been configured with positive numbers. Use 0 to  
     * disable the creation of the corresponding thread. 
     */ 
    if (port != 0) 
        smpp->transmitter = gwthread_create(io_thread, io_arg_create(smpp,  
                                           (transceiver_mode ? 2 : 1))); 
    if (receive_port != 0) 
        smpp->receiver = gwthread_create(io_thread, io_arg_create(smpp, 0)); 
     
    if ((port != 0 && smpp->transmitter == -1) ||  
        (receive_port != 0 && smpp->receiver == -1)) { 
        error(0, "SMPP[%s]: Couldn't start I/O threads.",
              octstr_get_cstr(smpp->conn->id)); 
        smpp->quitting = 1; 
        if (smpp->transmitter != -1) { 
            gwthread_wakeup(smpp->transmitter); 
            gwthread_join(smpp->transmitter); 
        } 
        if (smpp->receiver != -1) { 
            gwthread_wakeup(smpp->receiver); 
            gwthread_join(smpp->receiver); 
        } 
      smpp_destroy(conn->data); 
        return -1; 
    } 
 
    conn->shutdown = shutdown_cb; 
    conn->queued = queued_cb; 
    conn->send_msg = send_msg_cb; 
 
    return 0; 
}
 

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