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filt.peg
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filt.peg
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// PEG.js filter rules - see https://pegjs.org/
{
function or(first, second) {
// Add explicit function names to ease debugging.
function orFilter() {
return first.apply(this, arguments) || second.apply(this, arguments);
}
orFilter.desc = first.desc + " or " + second.desc;
return orFilter;
}
function and(first, second) {
function andFilter() {
return first.apply(this, arguments) && second.apply(this, arguments);
}
andFilter.desc = first.desc + " and " + second.desc;
return andFilter;
}
function not(expr) {
function notFilter() {
return !expr.apply(this, arguments);
}
notFilter.desc = "not " + expr.desc;
return notFilter;
}
function binding(expr) {
function bindingFilter() {
return expr.apply(this, arguments);
}
bindingFilter.desc = "(" + expr.desc + ")";
return bindingFilter;
}
// ~all
function allFilter(flow) {
return true;
}
allFilter.desc = "all flows";
// ~a
var ASSET_TYPES = [
new RegExp("text/javascript"),
new RegExp("application/x-javascript"),
new RegExp("application/javascript"),
new RegExp("text/css"),
new RegExp("image/.*"),
new RegExp("font/.*"),
new RegExp("application/font.*"),
];
function assetFilter(flow) {
if (flow.response) {
var ct = flowutils.ResponseUtils.getContentType(flow.response);
var i = ASSET_TYPES.length;
while (i--) {
if (ASSET_TYPES[i].test(ct)) {
return true;
}
}
}
return false;
}
assetFilter.desc = "is asset";
// ~b
function body(regex){
regex = new RegExp(regex, "i");
function bodyFilter(flow){
if (window.filtFilterList && window.filtFilterList.includes(flow.id)) {
return true
}
return false;
}
bodyFilter.desc = "body filters " + regex;
return bodyFilter;
}
// ~bq
function requestBody(regex){
regex = new RegExp(regex, "i");
function requestBodyFilter(flow){
if (window.filtFilterList && window.filtFilterList.includes(flow.id)) {
return true
}
return false;
}
requestBodyFilter.desc = "request body filters " + regex;
return requestBodyFilter;
}
// ~bs
function responseBody(regex){
regex = new RegExp(regex, "i");
function responseBodyFilter(flow){
if (window.filtFilterList && window.filtFilterList.includes(flow.id)) {
return true
}
return false;
}
responseBodyFilter.desc = "response body filters " + regex;
return responseBodyFilter;
}
// ~c
function responseCode(code){
function responseCodeFilter(flow){
return flow.response && flow.response.status_code === code;
}
responseCodeFilter.desc = "resp. code is " + code;
return responseCodeFilter;
}
// ~comment
function comment(regex){
regex = new RegExp(regex, "i");
function commentFilter(flow){
return regex.test(flow.comment)
}
commentFilter.desc = "comment matches " + regex;
return commentFilter;
}
// ~d
function domain(regex){
regex = new RegExp(regex, "i");
function domainFilter(flow){
return flow.request && (regex.test(flow.request.host) || regex.test(flow.request.pretty_host));
}
domainFilter.desc = "domain matches " + regex;
return domainFilter;
}
// ~dns
function dnsFilter(flow){
return flow.type === "dns";
}
dnsFilter.desc = "is a DNS Flow";
// ~dst
function destination(regex){
regex = new RegExp(regex, "i");
function destinationFilter(flow){
return (!!flow.server_conn.address)
&&
regex.test(flow.server_conn.address[0] + ":" + flow.server_conn.address[1]);
}
destinationFilter.desc = "destination address matches " + regex;
return destinationFilter;
}
// ~e
function errorFilter(flow){
return !!flow.error;
}
errorFilter.desc = "has error";
// ~h
function header(regex){
regex = new RegExp(regex, "i");
function headerFilter(flow){
return (
(flow.request && flowutils.RequestUtils.match_header(flow.request, regex))
||
(flow.response && flowutils.ResponseUtils.match_header(flow.response, regex))
);
}
headerFilter.desc = "header matches " + regex;
return headerFilter;
}
// ~hq
function requestHeader(regex){
regex = new RegExp(regex, "i");
function requestHeaderFilter(flow){
return (flow.request && flowutils.RequestUtils.match_header(flow.request, regex));
}
requestHeaderFilter.desc = "req. header matches " + regex;
return requestHeaderFilter;
}
// ~hs
function responseHeader(regex){
regex = new RegExp(regex, "i");
function responseHeaderFilter(flow){
return (flow.response && flowutils.ResponseUtils.match_header(flow.response, regex));
}
responseHeaderFilter.desc = "resp. header matches " + regex;
return responseHeaderFilter;
}
// ~http
function httpFilter(flow){
return flow.type === "http";
}
httpFilter.desc = "is an HTTP Flow";
// ~marked
function markedFilter(flow){
return flow.marked;
}
markedFilter.desc = "is marked";
// ~marker
function marker(regex){
regex = new RegExp(regex, "i");
function markerFilter(flow){
return regex.test(flow.marked)
}
markerFilter.desc = "marker matches " + regex;
return markerFilter;
}
// ~m
function method(regex){
regex = new RegExp(regex, "i");
function methodFilter(flow){
return flow.request && regex.test(flow.request.method);
}
methodFilter.desc = "method matches " + regex;
return methodFilter;
}
// ~q
function noResponseFilter(flow){
return flow.request && !flow.response;
}
noResponseFilter.desc = "has no response";
// ~replayq
function clientReplayFilter(flow){
return flow.is_replay === "request";
}
clientReplayFilter.desc = "request has been replayed";
// ~replays
function serverReplayFilter(flow){
return flow.is_replay === "response";
}
serverReplayFilter.desc = "response has been replayed";
// ~replay
function replayFilter(flow){
return !!flow.is_replay;
}
replayFilter.desc = "flow has been replayed";
// ~src
function source(regex){
regex = new RegExp(regex, "i");
function sourceFilter(flow){
return (!!flow.client_conn.peername)
&&
regex.test(flow.client_conn.peername[0] + ":" + flow.client_conn.peername[1]);
}
sourceFilter.desc = "source address matches " + regex;
return sourceFilter;
}
// ~s
function responseFilter(flow){
return !!flow.response;
}
responseFilter.desc = "has response";
// ~tcp
function tcpFilter(flow){
return flow.type === "tcp";
}
tcpFilter.desc = "is a TCP Flow";
// ~udp
function udpFilter(flow){
return flow.type === "udp";
}
udpFilter.desc = "is a UDP Flow";
// ~tq
function requestContentType(regex){
regex = new RegExp(regex, "i");
function requestContentTypeFilter(flow){
return flow.request && regex.test(flowutils.RequestUtils.getContentType(flow.request));
}
requestContentTypeFilter.desc = "req. content type matches " + regex;
return requestContentTypeFilter;
}
// ~ts
function responseContentType(regex){
regex = new RegExp(regex, "i");
function responseContentTypeFilter(flow){
return flow.response && regex.test(flowutils.ResponseUtils.getContentType(flow.response));
}
responseContentTypeFilter.desc = "resp. content type matches " + regex;
return responseContentTypeFilter;
}
// ~t
function contentType(regex){
regex = new RegExp(regex, "i");
function contentTypeFilter(flow){
return (
(flow.request && regex.test(flowutils.RequestUtils.getContentType(flow.request)))
||
(flow.response && regex.test(flowutils.ResponseUtils.getContentType(flow.response)))
);
}
contentTypeFilter.desc = "content type matches " + regex;
return contentTypeFilter;
}
// ~u
function url(regex){
regex = new RegExp(regex, "i");
function urlFilter(flow){
if (flow.type === "dns") {
const question = flow.request?.questions[0]
return question && regex.test(question.name)
}
return flow.request && regex.test(flowutils.RequestUtils.pretty_url(flow.request));
}
urlFilter.desc = "url matches " + regex;
return urlFilter;
}
// ~websocket
function websocketFilter(flow){
return !!flow.websocket;
}
websocketFilter.desc = "is a Websocket Flow";
}
start "filter expression"
= __ orExpr:OrExpr __ { return orExpr; }
ws "whitespace" = [ \t\n\r]
cc "control character" = [|&!()~"]
__ "optional whitespace" = ws*
OrExpr
= first:AndExpr __ "|" __ second:OrExpr
{ return or(first, second); }
/ AndExpr
AndExpr
= first:NotExpr __ "&" __ second:AndExpr
{ return and(first, second); }
/ first:NotExpr ws+ second:AndExpr
{ return and(first, second); }
/ NotExpr
NotExpr
= "!" __ expr:NotExpr
{ return not(expr); }
/ BindingExpr
BindingExpr
= "(" __ expr:OrExpr __ ")"
{ return binding(expr); }
/ Expr
/* All the filters are generally arranged in the order as they are described
on https://docs.mitmproxy.org/dev/concepts-filters/, with the exception of
single-letter filters, which are moved to the bottom so that they evaluate properly */
Expr
= "~all" { return allFilter; }
/ "~a" { return assetFilter; }
/ "~b" ws+ s:StringLiteral { return body(s); }
/ "~bq" ws+ s:StringLiteral { return requestBody(s); }
/ "~bs" ws+ s:StringLiteral { return responseBody(s); }
/ "~c" ws+ s:IntegerLiteral { return responseCode(s); }
/ "~comment" ws+ s:StringLiteral { return comment(s); }
/ "~d" ws+ s:StringLiteral { return domain(s); }
/ "~dns" { return dnsFilter; }
/ "~dst" ws+ s:StringLiteral { return destination(s); }
/ "~e" { return errorFilter; }
/ "~h" ws+ s:StringLiteral { return header(s); }
/ "~hq" ws+ s:StringLiteral { return requestHeader(s); }
/ "~hs" ws+ s:StringLiteral { return responseHeader(s); }
/ "~http" { return httpFilter; }
/ "~marked" { return markedFilter; }
/ "~marker" ws+ s:StringLiteral { return marker(s); }
/ "~m" ws+ s:StringLiteral { return method(s); }
/ "~q" { return noResponseFilter; }
/ "~replayq" { return clientReplayFilter; }
/ "~replays" { return serverReplayFilter; }
/ "~replay" { return replayFilter; }
/ "~src" ws+ s:StringLiteral { return source(s); }
/ "~s" { return responseFilter; }
/ "~tcp" { return tcpFilter; }
/ "~udp" { return udpFilter; }
/ "~tq" ws+ s:StringLiteral { return requestContentType(s); }
/ "~ts" ws+ s:StringLiteral { return responseContentType(s); }
/ "~t" ws+ s:StringLiteral { return contentType(s); }
/ "~u" ws+ s:StringLiteral { return url(s); }
/ "~websocket" { return websocketFilter; }
/ s:StringLiteral { return url(s); }
IntegerLiteral "integer"
= ['"]? digits:[0-9]+ ['"]? { return parseInt(digits.join(""), 10); }
StringLiteral "string"
= '"' chars:DoubleStringChar* '"' { return chars.join(""); }
/ "'" chars:SingleStringChar* "'" { return chars.join(""); }
/ !cc chars:UnquotedStringChar+ { return chars.join(""); }
DoubleStringChar
= !["\\] char:. { return char; }
/ "\\" char:EscapeSequence { return char; }
SingleStringChar
= !['\\] char:. { return char; }
/ "\\" char:EscapeSequence { return char; }
UnquotedStringChar
= !ws char:. { return char; }
EscapeSequence
= ['"\\]
/ "n" { return "\n"; }
/ "r" { return "\r"; }
/ "t" { return "\t"; }