jssip
Version:
the Javascript SIP library
252 lines (203 loc) • 8.15 kB
JavaScript
;
function _createForOfIteratorHelper(o, allowArrayLike) { var it; if (typeof Symbol === "undefined" || o[Symbol.iterator] == null) { if (Array.isArray(o) || (it = _unsupportedIterableToArray(o)) || allowArrayLike && o && typeof o.length === "number") { if (it) o = it; var i = 0; var F = function F() {}; return { s: F, n: function n() { if (i >= o.length) return { done: true }; return { done: false, value: o[i++] }; }, e: function e(_e) { throw _e; }, f: F }; } throw new TypeError("Invalid attempt to iterate non-iterable instance.\nIn order to be iterable, non-array objects must have a [Symbol.iterator]() method."); } var normalCompletion = true, didErr = false, err; return { s: function s() { it = o[Symbol.iterator](); }, n: function n() { var step = it.next(); normalCompletion = step.done; return step; }, e: function e(_e2) { didErr = true; err = _e2; }, f: function f() { try { if (!normalCompletion && it["return"] != null) it["return"](); } finally { if (didErr) throw err; } } }; }
function _unsupportedIterableToArray(o, minLen) { if (!o) return; if (typeof o === "string") return _arrayLikeToArray(o, minLen); var n = Object.prototype.toString.call(o).slice(8, -1); if (n === "Object" && o.constructor) n = o.constructor.name; if (n === "Map" || n === "Set") return Array.from(o); if (n === "Arguments" || /^(?:Ui|I)nt(?:8|16|32)(?:Clamped)?Array$/.test(n)) return _arrayLikeToArray(o, minLen); }
function _arrayLikeToArray(arr, len) { if (len == null || len > arr.length) len = arr.length; for (var i = 0, arr2 = new Array(len); i < len; i++) { arr2[i] = arr[i]; } return arr2; }
var Logger = require('./Logger');
var JsSIP_C = require('./Constants');
var SIPMessage = require('./SIPMessage');
var Utils = require('./Utils');
var logger = new Logger('sanityCheck'); // Checks for requests and responses.
var all = [minimumHeaders]; // Checks for requests.
var requests = [rfc3261_8_2_2_1, rfc3261_16_3_4, rfc3261_18_3_request, rfc3261_8_2_2_2]; // Checks for responses.
var responses = [rfc3261_8_1_3_3, rfc3261_18_3_response]; // local variables.
var message;
var ua;
var transport;
module.exports = function (m, u, t) {
message = m;
ua = u;
transport = t;
var _iterator = _createForOfIteratorHelper(all),
_step;
try {
for (_iterator.s(); !(_step = _iterator.n()).done;) {
var _check2 = _step.value;
if (_check2() === false) {
return false;
}
}
} catch (err) {
_iterator.e(err);
} finally {
_iterator.f();
}
if (message instanceof SIPMessage.IncomingRequest) {
var _iterator2 = _createForOfIteratorHelper(requests),
_step2;
try {
for (_iterator2.s(); !(_step2 = _iterator2.n()).done;) {
var check = _step2.value;
if (check() === false) {
return false;
}
}
} catch (err) {
_iterator2.e(err);
} finally {
_iterator2.f();
}
} else if (message instanceof SIPMessage.IncomingResponse) {
var _iterator3 = _createForOfIteratorHelper(responses),
_step3;
try {
for (_iterator3.s(); !(_step3 = _iterator3.n()).done;) {
var _check = _step3.value;
if (_check() === false) {
return false;
}
}
} catch (err) {
_iterator3.e(err);
} finally {
_iterator3.f();
}
} // Everything is OK.
return true;
};
/*
* Sanity Check for incoming Messages
*
* Requests:
* - _rfc3261_8_2_2_1_ Receive a Request with a non supported URI scheme
* - _rfc3261_16_3_4_ Receive a Request already sent by us
* Does not look at via sent-by but at jssip_id, which is inserted as
* a prefix in all initial requests generated by the ua
* - _rfc3261_18_3_request_ Body Content-Length
* - _rfc3261_8_2_2_2_ Merged Requests
*
* Responses:
* - _rfc3261_8_1_3_3_ Multiple Via headers
* - _rfc3261_18_3_response_ Body Content-Length
*
* All:
* - Minimum headers in a SIP message
*/
// Sanity Check functions for requests.
function rfc3261_8_2_2_1() {
if (message.s('to').uri.scheme !== 'sip') {
reply(416);
return false;
}
}
function rfc3261_16_3_4() {
if (!message.to_tag) {
if (message.call_id.substr(0, 5) === ua.configuration.jssip_id) {
reply(482);
return false;
}
}
}
function rfc3261_18_3_request() {
var len = Utils.str_utf8_length(message.body);
var contentLength = message.getHeader('content-length');
if (len < contentLength) {
reply(400);
return false;
}
}
function rfc3261_8_2_2_2() {
var fromTag = message.from_tag;
var call_id = message.call_id;
var cseq = message.cseq;
var tr; // Accept any in-dialog request.
if (message.to_tag) {
return;
} // INVITE request.
if (message.method === JsSIP_C.INVITE) {
// If the branch matches the key of any IST then assume it is a retransmission
// and ignore the INVITE.
// TODO: we should reply the last response.
if (ua._transactions.ist[message.via_branch]) {
return false;
} // Otherwise check whether it is a merged request.
else {
for (var transaction in ua._transactions.ist) {
if (Object.prototype.hasOwnProperty.call(ua._transactions.ist, transaction)) {
tr = ua._transactions.ist[transaction];
if (tr.request.from_tag === fromTag && tr.request.call_id === call_id && tr.request.cseq === cseq) {
reply(482);
return false;
}
}
}
}
} // Non INVITE request.
// If the branch matches the key of any NIST then assume it is a retransmission
// and ignore the request.
// TODO: we should reply the last response.
else if (ua._transactions.nist[message.via_branch]) {
return false;
} // Otherwise check whether it is a merged request.
else {
for (var _transaction in ua._transactions.nist) {
if (Object.prototype.hasOwnProperty.call(ua._transactions.nist, _transaction)) {
tr = ua._transactions.nist[_transaction];
if (tr.request.from_tag === fromTag && tr.request.call_id === call_id && tr.request.cseq === cseq) {
reply(482);
return false;
}
}
}
}
} // Sanity Check functions for responses.
function rfc3261_8_1_3_3() {
if (message.getHeaders('via').length > 1) {
logger.debug('more than one Via header field present in the response, dropping the response');
return false;
}
}
function rfc3261_18_3_response() {
var len = Utils.str_utf8_length(message.body),
contentLength = message.getHeader('content-length');
if (len < contentLength) {
logger.debug('message body length is lower than the value in Content-Length header field, dropping the response');
return false;
}
} // Sanity Check functions for requests and responses.
function minimumHeaders() {
var mandatoryHeaders = ['from', 'to', 'call_id', 'cseq', 'via'];
for (var _i = 0, _mandatoryHeaders = mandatoryHeaders; _i < _mandatoryHeaders.length; _i++) {
var header = _mandatoryHeaders[_i];
if (!message.hasHeader(header)) {
logger.debug("missing mandatory header field : ".concat(header, ", dropping the response"));
return false;
}
}
} // Reply.
function reply(status_code) {
var vias = message.getHeaders('via');
var to;
var response = "SIP/2.0 ".concat(status_code, " ").concat(JsSIP_C.REASON_PHRASE[status_code], "\r\n");
var _iterator4 = _createForOfIteratorHelper(vias),
_step4;
try {
for (_iterator4.s(); !(_step4 = _iterator4.n()).done;) {
var via = _step4.value;
response += "Via: ".concat(via, "\r\n");
}
} catch (err) {
_iterator4.e(err);
} finally {
_iterator4.f();
}
to = message.getHeader('To');
if (!message.to_tag) {
to += ";tag=".concat(Utils.newTag());
}
response += "To: ".concat(to, "\r\n");
response += "From: ".concat(message.getHeader('From'), "\r\n");
response += "Call-ID: ".concat(message.call_id, "\r\n");
response += "CSeq: ".concat(message.cseq, " ").concat(message.method, "\r\n");
response += '\r\n';
transport.send(response);
}