DevOps and security: августа 2017

FAQ about SMPP

Q: How to get notification on subscriber availability using HLR

A:
An ESME may use the set_dpf parameter [in the submit_sm] to request the setting of a delivery pending flag (DPF) for certain delivery failure scenarios, such as MS [i.e. Mobile Station] unavailability (as indicated by the HLR). The MC [i.e. Message Center] should respond to such a request with an alert_notification PDU when it detects that the destination MS has become available. For more information see https://www.activexperts.com/sms-component/sms/smpptlv/
Q: Каковы преимущества использования SMPP

A:

Q: What are the advantages of SMPP

A:

Q: How to get ESME status of sent message immediately / SMPP implementaion by fiorix.

A:

sm, err = c.tx.Submit(m)
if err == nil {
    log.Println("Send > ID:", sm.RespID())
} else {
    log.Println("Send > err", c.err)
    if sm != nil {
        s:= uint32(sm.Resp().Header().Status)
        log.Println("Send > err #", s)
    }
}

Q: How to check if transmitter is bound ? / SMPP implementaion by fiorix
I want to restrict Send() of message during reconnects. Because if Bind of Tranciever coincide with Submit_SM it causes Bind to fail -- SMSC does not answer on Bind.
A: Solution:
```
conn_st_ch := c.tx.Bind()
go func() {
    for {
        select {
        case conn_st := <-conn_st_ch:
            c.bound = conn_st.Status() == smpp.Connected
            log.Println("bound>", c.bound, c.id)
        }
    }
}()
```
Note: It works because of the non-blocking nature of signal sent from client::notify
Q: What software I can use for Tests / Debug / Simulation of SMPP gateway ?

A:
I recommend ActiveXPerts SMPP simulator. However it doesn't work under wine.

Q: How to parse short message from deliver_sm_resp

A: for JavaScript

var re_key = /(\w+(\s\w+)?)/
var re_val = /(\w+|[0-9a-f]+|null|\-)|(\s+|$)/
re_key.compile(re_key);
re_val.compile(re_val);

// examples:
//id:327 sub:001 dlvrd:001 submit date:1506272148 done date:1506272148 stat:DELIVRD err:null text:-'
//id:c449ab9744f47b6af1879e49e75e4f40 sub:001 dlvrd:0 submit date:0610191018 done date:0610191018 stat:ACCEPTD err:0 text:This is an Acti
//id:7220bb6bd0be98fa628de66590f80070 sub:001 dlvrd:1 submit date:0610190851 done date:0610190951 stat:DELIVRD err:0 text:This is an Acti
//id:b756c4f97aa2e1e67377dffc5e2f7d9b sub:001 dlvrd:0 submit date:0610191211 done date:0610191211 stat:REJECTD err:1 text:This is an Acti
//id:bd778cd76ae9e79da2ddc8188c68f8c1 sub:001 dlvrd:0 submit date:0610191533 done date:0610191539 stat:UNDELIV err:1 text:This is an Acti
//
//Field  Meaning
//id  The message reference of the message.
//    sub  Sub-ID, not used.
//    dlvrd  Value '1' when the message has been delivered, if the message is still pending '0'.
//    submit date  Submission date and time.
//    done date  Date and time the status has changed, or message delivery time when stat is set to 'DELIVRD'.
//    stat  Current status of the message.
//    err  Additional error code, provider specific.
//    text  Part of the original message text.

module.exports.short_msg_parse = function(msg) {
    obj = {};
    var s = msg//.toLowerCase();
    for (;;) {
        var i = s.indexOf(':');
        if (i <= 0) break;
        var f = s.slice(0, i);
        if (k = f.match( re_key )) {
            var key = k[1];
            s = s.slice(i + 1);
            if (v = s.match( re_val )) {
                i = v[0].length;
                s = s.slice(i);
                obj[key] = v[1];
            } else
                break;
        } else
            break;
    }
    // TODO: validate field names

FIELDS = [
        'id',
        'sub',
        'dlvrd',
        'submit date',
        'done date',
        'stat',
        'err',
        'text'
    ];
    return obj;
}

Q: How to parse done date in short message from deliver_sm_resp

A: for JavaScript

// possible date formats:
// yyMMddHHmm
// yyMMddHHmmss
// yyyyMMddHHmmss
module.exports.smppDate_toLocalDate = function (str) {
    var _size = Math.ceil(str.length / 2),
        _ret  = new Array(_size),
        _offset;

    for (var _i=0; _i<_size; _i++) {
        _offset = _i * 2;
        _ret[_i] = Number(str.substring(_offset, _offset + 2));
    }

    _ret[0] += 2000;
    _ret[1] -= 1;
    return utils.applyToConstructor(Date, _ret);
}

Q: What routing restrictions do countries have ?

A:
USA -- Please use E.164 format, as 14087525280 , additionally apart from the fact that the number appears to be a landline, for USA traffic you need to follow the guidance in this article. To summarise for USA traffic: * For P2P traffic you will need to use a Nexmo virtual number as sender. * For A2P traffic you will need to use either a Short Code or a Toll Free number/

China

France -- When sending to France with alpha sender IDs you must include within the message "STOP SMS AU 36184".

External links

1. https://github.com/fiorix/go-smpp

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