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/*******************************************************************************
* libproxy - A library for proxy configuration
* Copyright (C) 2006 Nathaniel McCallum <nathaniel@natemccallum.com>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
******************************************************************************/
#include <cstring> // ?
#include <unistd.h> // gethostname
#include "../extension_pacrunner.hpp"
using namespace libproxy;
// Work around a mozjs include bug
#ifndef JS_HAS_FILE_OBJECT
#define JS_HAS_FILE_OBJECT 0
#endif
#ifdef WIN32
#ifndef XP_WIN
#define XP_WIN
#endif
#endif
#pragma GCC diagnostic ignored "-Winvalid-offsetof"
#include <jsapi.h>
#pragma GCC diagnostic error "-Winvalid-offsetof"
#include <js/Initialization.h>
#include <js/CallArgs.h>
#include <js/CompilationAndEvaluation.h>
#include <js/MemoryFunctions.h>
#include <js/SourceText.h>
#include "pacutils.h"
#ifndef INET_ADDRSTRLEN
#define INET_ADDRSTRLEN 16
#endif
#ifndef INET6_ADDRSTRLEN
#define INET6_ADDRSTRLEN 46
#endif
static void dnsResolve_(JSContext *cx, JSString *hostname, JS::CallArgs *argv) {
char *tmp;
// Get hostname argument
JS::RootedString str(cx, hostname);
JS::UniqueChars chars = JS_EncodeStringToUTF8(cx, str);
const char *val = chars.get();
// Set the default return value
argv->rval().setNull();
// Look it up
struct addrinfo *info = nullptr;
if (getaddrinfo(val, NULL, NULL, &info))
goto out;
// Allocate the IP address
tmp = (char *) JS_malloc(cx, INET6_ADDRSTRLEN+1);
memset(tmp, 0, INET6_ADDRSTRLEN+1);
// Try for IPv4 and IPv6
if (getnameinfo(info->ai_addr, info->ai_addrlen,
tmp, INET6_ADDRSTRLEN+1,
NULL, 0,
NI_NUMERICHOST)) goto out;
// We succeeded
argv->rval().setString(JS_NewStringCopyZ(cx, tmp));
tmp = nullptr;
out:
if (info) freeaddrinfo(info);
}
static bool dnsResolve(JSContext *cx, unsigned argc, JS::Value *vp) {
JS::CallArgs argv=JS::CallArgsFromVp(argc,vp);
dnsResolve_(cx, argv[0].toString(), &argv);
return true;
}
static bool myIpAddress(JSContext *cx, unsigned argc, JS::Value *vp) {
JS::CallArgs argv=JS::CallArgsFromVp(argc,vp);
char *hostname = (char *) JS_malloc(cx, 1024);
hostname[1023] = '\0';
if (!gethostname(hostname, 1023)) {
JSString *myhost = JS_NewStringCopyN(cx, hostname, strlen(hostname));
dnsResolve_(cx, myhost, &argv);
} else {
argv.rval().setNull();
}
JS_free(cx, hostname);
return true;
}
// Setup Javascript global class
// This MUST be a static global
static JSClass cls = {
"global", JSCLASS_GLOBAL_FLAGS,
};
class mozjs_pacrunner : public pacrunner {
public:
mozjs_pacrunner(const string &pac, const url& pacurl) : pacrunner(pac, pacurl) {
// Set defaults
this->jsctx = nullptr;
JS_Init();
// Initialize Javascript context
if (!(this->jsctx = JS_NewContext(1024 * 1024))) goto error;
{
if (!JS::InitSelfHostedCode(this->jsctx)) goto error;
JS::RootedValue rval(this->jsctx);
JS::RealmOptions realm_opts;
this->jsglb = new JS::Heap<JSObject*>(JS_NewGlobalObject(
this->jsctx, &cls,
nullptr, JS::DontFireOnNewGlobalHook,
realm_opts));
if (!(this->jsglb)) goto error;
JS::RootedObject global(this->jsctx,this->jsglb->get());
if (!(this->jsar = new JSAutoRealm(this->jsctx, global))) goto error;
// Define Javascript functions
JS_DefineFunction(this->jsctx, global, "dnsResolve", dnsResolve, 1, 0);
JS_DefineFunction(this->jsctx, global, "myIpAddress", myIpAddress, 0, 0);
JS::CompileOptions options(this->jsctx);
JS::SourceText<mozilla::Utf8Unit> routines, pac_source;
if (!routines.init(this->jsctx,
JAVASCRIPT_ROUTINES,
strlen(JAVASCRIPT_ROUTINES),
JS::SourceOwnership::Borrowed))
goto error;
if (!pac_source.init(this->jsctx,
pac.c_str(),
pac.length(),
JS::SourceOwnership::Borrowed))
goto error;
JS::Evaluate(this->jsctx, options, routines, JS::MutableHandleValue(&rval));
// Add PAC to the environment
JS::Evaluate(this->jsctx, options, pac_source, JS::MutableHandleValue(&rval));
return;
}
error:
if (this->jsctx) JS_DestroyContext(this->jsctx);
throw bad_alloc();
}
~mozjs_pacrunner() {
if (this->jsar) delete this->jsar;
if (this->jsglb) delete this->jsglb;
if (this->jsctx) JS_DestroyContext(this->jsctx);
JS_ShutDown();
}
string run(const url& url_) {
// Build arguments to the FindProxyForURL() function
string tmpurl(url_.to_string());
string tmphost(url_.get_host());
JS::AutoValueArray<2> args(this->jsctx);
args[0].setString(JS_NewStringCopyZ(this->jsctx, tmpurl.c_str()));
args[1].setString(JS_NewStringCopyZ(this->jsctx, tmphost.c_str()));
// Find the proxy (call FindProxyForURL())
JS::RootedValue rval(this->jsctx);
JS::RootedObject global(this->jsctx,this->jsglb->get());
bool result = JS_CallFunctionName(this->jsctx, global, "FindProxyForURL", args, &rval);
if (!result) return "";
if (!rval.isString())
return "";
JS::RootedString s(this->jsctx, rval.toString());
JS::UniqueChars chars = JS_EncodeStringToUTF8(this->jsctx, s);
const char *tmpanswer = chars.get();
string answer = string(tmpanswer);
if (answer == "undefined") return "";
return answer;
}
private:
JSContext *jsctx;
JS::Heap<JSObject*> *jsglb;
JSAutoRealm *jsar;
};
PX_PACRUNNER_MODULE_EZ(mozjs, "JS_DefineFunction", "mozjs");
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