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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 <stdlib.h>
#include <string.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netdb.h>
#include <arpa/inet.h>
#define __USE_BSD
#include <unistd.h>
#include <misc.h>
#include <proxy_factory.h>
#include <jsapi.h>
#include "pacutils.h"
static JSBool dnsResolve(JSContext *cx, JSObject *obj, uintN argc, jsval *argv, jsval *rval) {
// Get hostname argument
char *tmp = px_strdup(JS_GetStringBytes(JS_ValueToString(cx, argv[0])));
// Set the default return value
*rval = JSVAL_NULL;
// Look it up
struct addrinfo *info = NULL;
if (getaddrinfo(tmp, NULL, NULL, &info))
goto out;
// Allocate the IP address
px_free(tmp);
tmp = px_malloc0(INET6_ADDRSTRLEN+1);
// Try for IPv4 and IPv6
if (!inet_ntop(info->ai_family,
&((struct sockaddr_in *) info->ai_addr)->sin_addr,
tmp, INET_ADDRSTRLEN+1) > 0)
if (!inet_ntop(info->ai_family,
&((struct sockaddr_in6 *) info->ai_addr)->sin6_addr,
tmp, INET6_ADDRSTRLEN+1) > 0)
goto out;
// We succeeded
*rval = STRING_TO_JSVAL(JS_NewString(cx, tmp, strlen(tmp)));
tmp = NULL;
out:
if (info) freeaddrinfo(info);
px_free(tmp);
return true;
}
static JSBool myIpAddress(JSContext *cx, JSObject *obj, uintN argc, jsval *argv, jsval *rval) {
char *hostname = JS_malloc(cx, 1024);
if (!gethostname(hostname, 1023)) {
JSString *myhost = JS_NewString(cx, hostname, strlen(hostname));
jsval arg = STRING_TO_JSVAL(myhost);
return dnsResolve(cx, obj, 1, &arg, rval);
}
px_free(hostname);
*rval = JSVAL_NULL;
return true;
}
typedef struct {
JSRuntime *run;
JSContext *ctx;
JSClass *cls;
char *pac;
} ctxStore;
static void ctxs_free(ctxStore *self)
{
if (!self) return;
if (self->ctx) JS_DestroyContext(self->ctx);
if (self->run) JS_DestroyRuntime(self->run);
if (self->cls) px_free(self->cls);
px_free(self->pac);
px_free(self);
}
static ctxStore *ctxs_new(pxPAC *pac)
{
JSObject *global = NULL;
jsval rval;
// Create the basic context
ctxStore *self = px_malloc0(sizeof(ctxStore));
// Setup Javascript global class
self->cls = px_malloc0(sizeof(JSClass));
self->cls->name = "global";
self->cls->flags = 0;
self->cls->addProperty = JS_PropertyStub;
self->cls->delProperty = JS_PropertyStub;
self->cls->getProperty = JS_PropertyStub;
self->cls->setProperty = JS_PropertyStub;
self->cls->enumerate = JS_EnumerateStub;
self->cls->resolve = JS_ResolveStub;
self->cls->convert = JS_ConvertStub;
self->cls->finalize = JS_FinalizeStub;
// Initialize Javascript runtime environment
if (!(self->run = JS_NewRuntime(1024 * 1024))) goto error;
if (!(self->ctx = JS_NewContext(self->run, 1024 * 1024))) goto error;
if (!(global = JS_NewObject(self->ctx, self->cls, NULL, NULL))) goto error;
JS_InitStandardClasses(self->ctx, global);
// Define Javascript functions
JS_DefineFunction(self->ctx, global, "dnsResolve", dnsResolve, 1, 0);
JS_DefineFunction(self->ctx, global, "myIpAddress", myIpAddress, 0, 0);
JS_EvaluateScript(self->ctx, global, JAVASCRIPT_ROUTINES,
strlen(JAVASCRIPT_ROUTINES), "pacutils.js", 0, &rval);
// Add PAC to the environment
JS_EvaluateScript(self->ctx, global, px_pac_to_string(pac),
strlen(px_pac_to_string(pac)),
px_url_to_string((pxURL *) px_pac_get_url(pac)),
0, &rval);
// Save the pac
self->pac = px_strdup(px_pac_to_string(pac));
return self;
error:
ctxs_free(self);
return NULL;
}
char *mozjs_pacrunner(pxProxyFactory *self, pxPAC *pac, pxURL *url)
{
// Make sure we have the pac file and url
if (!pac) return NULL;
if (!url) return NULL;
if (!px_pac_to_string(pac) && !px_pac_reload(pac)) return NULL;
// Get the cached context
ctxStore *ctxs = px_proxy_factory_misc_get(self, "mozjs");
// If there is a cached context, make sure it is the same pac
if (ctxs && strcmp(ctxs->pac, px_pac_to_string(pac)))
{
ctxs_free(ctxs);
ctxs = NULL;
}
// If no context exists (or if the pac was changed), create one
if (!ctxs)
{
if ((ctxs = ctxs_new(pac)))
px_proxy_factory_misc_set(self, "mozjs", ctxs);
else
return NULL;
}
// Build arguments to the FindProxyForURL() function
char *tmpurl = px_strdup(px_url_to_string(url));
char *tmphost = px_strdup(px_url_get_host(url));
jsval args[2] = {
STRING_TO_JSVAL(JS_NewString(ctxs->ctx, tmpurl, strlen(tmpurl))),
STRING_TO_JSVAL(JS_NewString(ctxs->ctx, tmphost, strlen(tmphost)))
};
// Find the proxy (call FindProxyForURL())
jsval rval;
JSBool result = JS_CallFunctionName(ctxs->ctx, JS_GetGlobalObject(ctxs->ctx), "FindProxyForURL", 2, args, &rval);
if (!result) return NULL;
char *answer = px_strdup(JS_GetStringBytes(JS_ValueToString(ctxs->ctx, rval)));
if (!answer || !strcmp(answer, "undefined")) {
px_free(answer);
return NULL;
}
return answer;
}
bool on_proxy_factory_instantiate(pxProxyFactory *self)
{
return px_proxy_factory_pac_runner_set(self, mozjs_pacrunner);
}
void on_proxy_factory_destantiate(pxProxyFactory *self)
{
px_proxy_factory_pac_runner_set(self, NULL);
ctxs_free(px_proxy_factory_misc_get(self, "mozjs"));
px_proxy_factory_misc_set(self, "mozjs", NULL);
}
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