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Fixed extraction of UDH header from original buffer rather than from encoded message as CSMS reference / values number greater than 0x7F were not decoded properly.

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This commit is contained in:
Qasim Ayyaz Khan
2016-06-02 23:52:25 -04:00
parent 7d0da6202c
commit 8f1c94724c
2 changed files with 27 additions and 14 deletions
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lib/utils.js
+23 -2
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@@ -271,8 +271,29 @@ function pduToObj(pdu, stupidNullByte, callback) {
paramSize = command.params[param].type.size(retObj.params[param]);
log.silly('larvitsmpp: lib/utils.js: pduToObj() - Reading param "' + param + '" at offset ' + offset + ' with calculated size: ' + paramSize + ' content in hex: ' + pdu.slice(offset, offset + paramSize).toString('hex'));
if (param === 'short_message') {
if((retObj.params['esm_class'] & 0x40) === 0x40) {
//This is a part of long sms. We should save UDH header information in params.
console.log(pdu.slice(offset, offset + paramSize).toString('hex').slice(6, 8))
var hsize = parseInt("0x" + pdu.slice(offset, offset + paramSize).toString('hex').slice(0, 2));
//If hsize is >5 then CSMS Reference consist of two parts
if(hsize == 5) {
var reference = parseInt("0x" + pdu.slice(offset, offset + paramSize).toString('hex').slice(6, 8)),
totalParts = parseInt("0x" + pdu.slice(offset, offset + paramSize).toString('hex').slice(8, 10)),
partNr = parseInt("0x" + pdu.slice(offset, offset + paramSize).toString('hex').slice(10, 12));
} else {
var reference = (parseInt("0x" + pdu.slice(offset, offset + paramSize).toString('hex').slice(6, 8)) * 256) + parseInt("0x" + pdu.slice(offset, offset + paramSize).toString('hex').slice(8, 10)),
totalParts = parseInt("0x" + pdu.slice(offset, offset + paramSize).toString('hex').slice(10, 12)),
partNr = parseInt("0x" + pdu.slice(offset, offset + paramSize).toString('hex').slice(12, 14));
}
var udhHeader = {
'size': hsize,
'reference': reference,
'totalParts': totalParts,
'partNr': partNr
}
retObj.params['udhHeader'] = udhHeader;
}
// Check if we have a trailing NULL octet after the short_message. Some idiot thought that would be a good idea
// in some implementations, so we need to account for that.
if (stupidNullByte === true) {
@@ -782,4 +803,4 @@ exports.pduReturn = pduReturn;
exports.smppDate = smppDate;
exports.bitCount = bitCount;
exports.splitMsg = splitMsg;
exports.smsDlr = smsDlr;
exports.smsDlr = smsDlr;