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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 <unistd.h>
#include <string.h>
#include <time.h>
#include <sys/types.h>
#include <sys/socket.h>
#include "url.h"
#include "misc.h"
#include "pac.h"
#define PAC_MIME_TYPE "application/x-ns-proxy-autoconfig"
/**
* ProxyAutoConfig object. All fields are private.
*/
struct _pxPAC {
pxURL *url;
char *cache;
time_t expires;
};
/**
* Frees memory used by the ProxyAutoConfig.
*/
void
px_pac_free(pxPAC *self)
{
if (!self) return;
px_url_free(self->url);
px_free(self->cache);
px_free(self);
}
/**
* Get the URL which the pxPAC uses.
* @return The URL that the pxPAC came from
*/
const pxURL *
px_pac_get_url(pxPAC *self)
{
return self->url;
}
/**
* Create a new ProxyAutoConfig.
* @url The URL where the PAC file is found
* @return A new ProxyAutoConfig or NULL on error
*/
pxPAC *
px_pac_new(pxURL *url)
{
if (!url) return NULL;
// Allocate the object
pxPAC *self = px_malloc0(sizeof(pxPAC));
// Copy the given URL
self->url = px_url_new(px_url_to_string(url)); // Always returns valid value
// Make sure we have a real pxPAC
if (!px_pac_reload(self)) { px_pac_free(self); return NULL; }
return self;
}
/**
* Create a new ProxyAutoConfig (from a string for convenience).
* @url The url (string) where the PAC file is found
* @return A new ProxyAutoConfig or NULL on error
*/
pxPAC *
px_pac_new_from_string(char *url)
{
// Create temporary URL
pxURL *tmpurl = px_url_new(url);
if (!tmpurl) return NULL;
// Create pac
pxPAC *self = px_pac_new(tmpurl);
px_url_free(tmpurl); // Free no longer used URL
if (!self) return NULL;
return self;
}
/**
* Returns the Javascript code which the pxPAC uses.
* @return The Javascript code used by the pxPAC
*/
const char *
px_pac_to_string(pxPAC *self)
{
return self->cache;
}
/**
* Download the latest version of the pxPAC file
* @return Whether the download was successful or not
*/
bool
px_pac_reload(pxPAC *self)
{
int sock;
char *line = NULL;
const char *headers[3] = { "Accept: " PAC_MIME_TYPE, "Connection: close", NULL };
bool correct_mime_type;
unsigned long int content_length = 0;
// Get the pxPAC
sock = px_url_get(self->url, headers);
if (sock < 0) return false;
// Verify status line
line = px_readline(sock);
if (!line) goto error;
if (strncmp(line, "HTTP", strlen("HTTP"))) goto error; // Check valid HTTP response
if (!strchr(line, ' ') || atoi(strchr(line, ' ') + 1) != 200) goto error; // Check status code
// Check for correct mime type and content length
while (strcmp(line, "\r")) {
// Check for content type
if (strstr(line, "Content-Type: ") == line && strstr(line, PAC_MIME_TYPE))
correct_mime_type = true;
// Check for content length
else if (strstr(line, "Content-Length: ") == line)
content_length = atoi(line + strlen("Content-Length: "));
// Get new line
px_free(line);
line = px_readline(sock);
if (!line) goto error;
}
// Get content
if (!content_length || !correct_mime_type) goto error;
px_free(line); line = NULL;
px_free(self->cache);
self->cache = px_malloc0(content_length+1);
for (int recvd=0 ; recvd != content_length ; )
recvd += recv(sock, self->cache + recvd, content_length - recvd, 0);
// Clean up
close(sock);
return true;
error:
px_free(self->cache); self->cache = NULL;
if (sock >= 0) close(sock);
px_free(line);
return false;
}
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