X-Git-Url: http://www.privoxy.org/gitweb/?p=privoxy.git;a=blobdiff_plain;f=cgi.c;h=f81443ee199173a335e9593731f716c00cea6989;hp=20f2fc422639e311e4838d723d48c577232ee44b;hb=c88024b1f6a64ecc2d923ff875e10f15b64daff3;hpb=effa99e4df3dbc95aafd3dd940c0454ca0a2ce44

diff --git a/cgi.c b/cgi.c
index 20f2fc42..f81443ee 100644
--- a/cgi.c
+++ b/cgi.c
@@ -1,4 +1,4 @@
-const char cgi_rcs[] = "$Id: cgi.c,v 1.122 2009/06/11 11:47:16 fabiankeil Exp $";
+const char cgi_rcs[] = "$Id: cgi.c,v 1.157 2012/11/09 10:47:42 fabiankeil Exp $";
 /*********************************************************************
  *
  * File        :  $Source: /cvsroot/ijbswa/current/cgi.c,v $
@@ -7,18 +7,15 @@ const char cgi_rcs[] = "$Id: cgi.c,v 1.122 2009/06/11 11:47:16 fabiankeil Exp $"
  *                html or gif answers, and to compose HTTP resonses.
  *                This only contains the framework functions, the
  *                actual handler functions are declared elsewhere.
- *                
- *                Functions declared include:
- * 
  *
  * Copyright   :  Written by and Copyright (C) 2001-2004, 2006-2008
  *                the SourceForge Privoxy team. http://www.privoxy.org/
  *
  *                Based on the Internet Junkbuster originally written
- *                by and Copyright (C) 1997 Anonymous Coders and 
+ *                by and Copyright (C) 1997 Anonymous Coders and
  *                Junkbusters Corporation.  http://www.junkbusters.com
  *
- *                This program is free software; you can redistribute it 
+ *                This program is free software; you can redistribute it
  *                and/or modify it under the terms of the GNU General
  *                Public License as published by the Free Software
  *                Foundation; either version 2 of the License, or (at
@@ -49,6 +46,10 @@ const char cgi_rcs[] = "$Id: cgi.c,v 1.122 2009/06/11 11:47:16 fabiankeil Exp $"
 #include <limits.h>
 #include <assert.h>
 
+#ifdef FEATURE_COMPRESSION
+#include <zlib.h>
+#endif
+
 #include "project.h"
 #include "cgi.h"
 #include "list.h"
@@ -81,126 +82,126 @@ static const struct cgi_dispatcher cgi_dispatchers[] = {
          "Privoxy main page",
          TRUE },
 #ifdef FEATURE_GRACEFUL_TERMINATION
-   { "die", 
-         cgi_die,  
+   { "die",
+         cgi_die,
          "<b>Shut down</b> - <em class=\"warning\">Do not deploy this build in a production environment, "
         "this is a one click Denial Of Service attack!!!</em>",
-         FALSE }, 
+         FALSE },
 #endif
-   { "show-status", 
-         cgi_show_status,  
+   { "show-status",
+         cgi_show_status,
 #ifdef FEATURE_CGI_EDIT_ACTIONS
         "View &amp; change the current configuration",
 #else
         "View the current configuration",
 #endif
-         TRUE }, 
-   { "show-version", 
-         cgi_show_version,  
+         TRUE },
+   { "show-version",
+         cgi_show_version,
          "View the source code version numbers",
-          TRUE }, 
-   { "show-request", 
-         cgi_show_request,  
+          TRUE },
+   { "show-request",
+         cgi_show_request,
          "View the request headers",
-         TRUE }, 
+         TRUE },
    { "show-url-info",
-         cgi_show_url_info, 
+         cgi_show_url_info,
          "Look up which actions apply to a URL and why",
          TRUE },
 #ifdef FEATURE_TOGGLE
    { "toggle",
-         cgi_toggle, 
+         cgi_toggle,
          "Toggle Privoxy on or off",
          FALSE },
 #endif /* def FEATURE_TOGGLE */
 #ifdef FEATURE_CGI_EDIT_ACTIONS
    { "edit-actions", /* Edit the actions list */
-         cgi_edit_actions, 
+         cgi_edit_actions,
          NULL, FALSE },
    { "eaa", /* Shortcut for edit-actions-add-url-form */
-         cgi_edit_actions_add_url_form, 
+         cgi_edit_actions_add_url_form,
          NULL, FALSE },
    { "eau", /* Shortcut for edit-actions-url-form */
-         cgi_edit_actions_url_form, 
+         cgi_edit_actions_url_form,
          NULL, FALSE },
    { "ear", /* Shortcut for edit-actions-remove-url-form */
-         cgi_edit_actions_remove_url_form, 
+         cgi_edit_actions_remove_url_form,
          NULL, FALSE },
    { "eal", /* Shortcut for edit-actions-list */
-         cgi_edit_actions_list, 
+         cgi_edit_actions_list,
          NULL, FALSE },
    { "eafu", /* Shortcut for edit-actions-for-url */
-         cgi_edit_actions_for_url, 
+         cgi_edit_actions_for_url,
          NULL, FALSE },
    { "eas", /* Shortcut for edit-actions-submit */
-         cgi_edit_actions_submit, 
+         cgi_edit_actions_submit,
          NULL, FALSE },
    { "easa", /* Shortcut for edit-actions-section-add */
-         cgi_edit_actions_section_add, 
+         cgi_edit_actions_section_add,
          NULL, FALSE  },
    { "easr", /* Shortcut for edit-actions-section-remove */
-         cgi_edit_actions_section_remove, 
+         cgi_edit_actions_section_remove,
          NULL, FALSE  },
    { "eass", /* Shortcut for edit-actions-section-swap */
-         cgi_edit_actions_section_swap, 
+         cgi_edit_actions_section_swap,
          NULL, FALSE  },
    { "edit-actions-for-url",
-         cgi_edit_actions_for_url, 
+         cgi_edit_actions_for_url,
          NULL, FALSE  /* Edit the actions for (a) specified URL(s) */ },
    { "edit-actions-list",
-         cgi_edit_actions_list, 
+         cgi_edit_actions_list,
          NULL, TRUE /* Edit the actions list */ },
    { "edit-actions-submit",
-         cgi_edit_actions_submit, 
+         cgi_edit_actions_submit,
          NULL, FALSE /* Change the actions for (a) specified URL(s) */ },
    { "edit-actions-url",
-         cgi_edit_actions_url, 
+         cgi_edit_actions_url,
          NULL, FALSE /* Change a URL pattern in the actionsfile */ },
    { "edit-actions-url-form",
-         cgi_edit_actions_url_form, 
+         cgi_edit_actions_url_form,
          NULL, FALSE /* Form to change a URL pattern in the actionsfile */ },
    { "edit-actions-add-url",
-         cgi_edit_actions_add_url, 
+         cgi_edit_actions_add_url,
          NULL, FALSE /* Add a URL pattern to the actionsfile */ },
    { "edit-actions-add-url-form",
-         cgi_edit_actions_add_url_form, 
+         cgi_edit_actions_add_url_form,
          NULL, FALSE /* Form to add a URL pattern to the actionsfile */ },
    { "edit-actions-remove-url",
-         cgi_edit_actions_remove_url, 
+         cgi_edit_actions_remove_url,
          NULL, FALSE /* Remove a URL pattern from the actionsfile */ },
    { "edit-actions-remove-url-form",
-         cgi_edit_actions_remove_url_form, 
+         cgi_edit_actions_remove_url_form,
          NULL, FALSE /* Form to remove a URL pattern from the actionsfile */ },
    { "edit-actions-section-add",
-         cgi_edit_actions_section_add, 
+         cgi_edit_actions_section_add,
          NULL, FALSE /* Remove a section from the actionsfile */ },
    { "edit-actions-section-remove",
-         cgi_edit_actions_section_remove, 
+         cgi_edit_actions_section_remove,
          NULL, FALSE /* Remove a section from the actionsfile */ },
    { "edit-actions-section-swap",
-         cgi_edit_actions_section_swap, 
+         cgi_edit_actions_section_swap,
          NULL, FALSE /* Swap two sections in the actionsfile */ },
 #endif /* def FEATURE_CGI_EDIT_ACTIONS */
-   { "error-favicon.ico", 
-         cgi_send_error_favicon,  
+   { "error-favicon.ico",
+         cgi_send_error_favicon,
          NULL, TRUE /* Sends the favicon image for error pages. */ },
-   { "favicon.ico", 
-         cgi_send_default_favicon,  
+   { "favicon.ico",
+         cgi_send_default_favicon,
          NULL, TRUE /* Sends the default favicon image. */ },
-   { "robots.txt", 
-         cgi_robots_txt,  
-         NULL, TRUE /* Sends a robots.txt file to tell robots to go away. */ }, 
+   { "robots.txt",
+         cgi_robots_txt,
+         NULL, TRUE /* Sends a robots.txt file to tell robots to go away. */ },
    { "send-banner",
-         cgi_send_banner, 
+         cgi_send_banner,
          NULL, TRUE /* Send a built-in image */ },
    { "send-stylesheet",
-         cgi_send_stylesheet, 
+         cgi_send_stylesheet,
          NULL, FALSE /* Send templates/cgi-style.css */ },
    { "t",
-         cgi_transparent_image, 
+         cgi_transparent_image,
          NULL, TRUE /* Send a transparent image (short name) */ },
    { "url-info-osd.xml",
-         cgi_send_url_info_osd, 
+         cgi_send_url_info_osd,
          NULL, TRUE /* Send templates/url-info-osd.xml */ },
    { "user-manual",
           cgi_send_user_manual,
@@ -267,6 +268,13 @@ const char image_blank_data[] =
 const size_t image_pattern_length = sizeof(image_pattern_data) - 1;
 const size_t image_blank_length   = sizeof(image_blank_data) - 1;
 
+#ifdef FEATURE_COMPRESSION
+/*
+ * Minimum length which a buffer has to reach before
+ * we bother to (re-)compress it. Completely arbitrary.
+ */
+const size_t LOWER_LENGTH_LIMIT_FOR_COMPRESSION = 1024U;
+#endif
 
 static struct http_response cgi_error_memory_response[1];
 
@@ -276,7 +284,7 @@ static struct map *parse_cgi_parameters(char *argstring);
 
 
 /*********************************************************************
- * 
+ *
  * Function    :  dispatch_cgi
  *
  * Description :  Checks if a request URL has either the magical
@@ -306,15 +314,15 @@ struct http_response *dispatch_cgi(struct client_state *csp)
    /* Either the host matches CGI_SITE_1_HOST ..*/
    if (   ( (0 == strcmpic(host, CGI_SITE_1_HOST))
          || (0 == strcmpic(host, CGI_SITE_1_HOST ".")))
-       && (path[0] == '/') )
+       && (path[0] == '/'))
    {
       /* ..then the path will all be for us.  Remove leading '/' */
       path++;
    }
    /* Or it's the host part CGI_SITE_2_HOST, and the path CGI_SITE_2_PATH */
-   else if ( ( (0 == strcmpic(host, CGI_SITE_2_HOST ))
-            || (0 == strcmpic(host, CGI_SITE_2_HOST ".")) )
-          && (0 == strncmpic(path, CGI_SITE_2_PATH, strlen(CGI_SITE_2_PATH))) )
+   else if ((  (0 == strcmpic(host, CGI_SITE_2_HOST))
+            || (0 == strcmpic(host, CGI_SITE_2_HOST ".")))
+          && (0 == strncmpic(path, CGI_SITE_2_PATH, strlen(CGI_SITE_2_PATH))))
    {
       /* take everything following CGI_SITE_2_PATH */
       path += strlen(CGI_SITE_2_PATH);
@@ -338,7 +346,22 @@ struct http_response *dispatch_cgi(struct client_state *csp)
       return NULL;
    }
 
-   /* 
+   if (strcmpic(csp->http->gpc, "GET")
+    && strcmpic(csp->http->gpc, "HEAD"))
+   {
+      log_error(LOG_LEVEL_ERROR,
+         "CGI request with unsupported method received: %s", csp->http->gpc);
+      /*
+       * The CGI pages currently only support GET and HEAD requests.
+       *
+       * If the client used a different method, ditch any data following
+       * the current headers to reduce the likelihood of parse errors
+       * with the following request.
+       */
+      csp->client_iob->eod = csp->client_iob->cur;
+   }
+
+   /*
     * This is a CGI call.
     */
 
@@ -383,7 +406,7 @@ static char *grep_cgi_referrer(const struct client_state *csp)
 
 
 /*********************************************************************
- * 
+ *
  * Function    :  referrer_is_safe
  *
  * Description :  Decides whether we trust the Referer for
@@ -431,7 +454,7 @@ static int referrer_is_safe(const struct client_state *csp)
 }
 
 /*********************************************************************
- * 
+ *
  * Function    :  dispatch_known_cgi
  *
  * Description :  Processes a CGI once dispatch_cgi has determined that
@@ -469,7 +492,7 @@ static struct http_response *dispatch_known_cgi(struct client_state * csp,
    {
       query_args_start++;
    }
-   if (*query_args_start == '/') 
+   if (*query_args_start == '/')
    {
       *query_args_start++ = '\0';
       if ((param_list = new_map()))
@@ -504,7 +527,7 @@ static struct http_response *dispatch_known_cgi(struct client_state * csp,
       return cgi_error_memory();
    }
 
-   /* 
+   /*
     * Find and start the right CGI function
     */
    d = cgi_dispatchers;
@@ -547,13 +570,15 @@ static struct http_response *dispatch_known_cgi(struct client_state * csp,
          if (err && (err != JB_ERR_MEMORY))
          {
             /* Unexpected error! Shouldn't get here */
-            log_error(LOG_LEVEL_ERROR, "Unexpected CGI error %d in top-level handler.  Please file a bug report!", err);
+            log_error(LOG_LEVEL_ERROR,
+               "Unexpected CGI error %d in top-level handler. "
+               "Please file a bug report!", err);
             err = cgi_error_unknown(csp, rsp, err);
          }
          if (!err)
          {
             /* It worked */
-            rsp->reason = RSP_REASON_CGI_CALL;
+            rsp->crunch_reason = CGI_CALL;
             return finish_http_response(csp, rsp);
          }
          else
@@ -566,8 +591,8 @@ static struct http_response *dispatch_known_cgi(struct client_state * csp,
       d++;
    }
 }
-   
-        
+
+
 /*********************************************************************
  *
  * Function    :  parse_cgi_parameters
@@ -584,16 +609,35 @@ static struct http_response *dispatch_known_cgi(struct client_state * csp,
 static struct map *parse_cgi_parameters(char *argstring)
 {
    char *p;
-   char *vector[BUFFER_SIZE];
+   char **vector;
    int pairs, i;
    struct map *cgi_params;
 
+   /*
+    * XXX: This estimate is guaranteed to be high enough as we
+    *      let ssplit() ignore empty fields, but also a bit wasteful.
+    *      The same hack is used in get_last_url() so it looks like
+    *      a real solution is needed.
+    */
+   size_t max_segments = strlen(argstring) / 2;
+   if (max_segments == 0)
+   {
+      /*
+       * XXX: If the argstring is empty, there's really
+       *      no point in creating a param list, but currently
+       *      other parts of Privoxy depend on the list's existence.
+       */
+      max_segments = 1;
+   }
+   vector = malloc_or_die(max_segments * sizeof(char *));
+
    if (NULL == (cgi_params = new_map()))
    {
+      freez(vector);
       return NULL;
    }
 
-   /* 
+   /*
     * IE 5 does, of course, violate RFC 2316 Sect 4.1 and sends
     * the fragment identifier along with the request, so we must
     * cut it off here, so it won't pollute the CGI params:
@@ -603,7 +647,14 @@ static struct map *parse_cgi_parameters(char *argstring)
       *p = '\0';
    }
 
-   pairs = ssplit(argstring, "&", vector, SZ(vector), 1, 1);
+   pairs = ssplit(argstring, "&", vector, max_segments);
+   assert(pairs != -1);
+   if (pairs == -1)
+   {
+      freez(vector);
+      free_map(cgi_params);
+      return NULL;
+   }
 
    for (i = 0; i < pairs; i++)
    {
@@ -612,12 +663,15 @@ static struct map *parse_cgi_parameters(char *argstring)
          *p = '\0';
          if (map(cgi_params, url_decode(vector[i]), 0, url_decode(++p), 0))
          {
+            freez(vector);
             free_map(cgi_params);
             return NULL;
          }
       }
    }
 
+   freez(vector);
+
    return cgi_params;
 
 }
@@ -713,8 +767,8 @@ jb_err get_string_param(const struct map *parameters,
    s = param;
    while ((ch = *s++) != '\0')
    {
-      if ( ((unsigned char)ch < (unsigned char)' ')
-        || (ch == '}') )
+      if (((unsigned char)ch < (unsigned char)' ')
+        || (ch == '}'))
       {
          /* Probable hack attempt, or user accidentally used '}'. */
          return JB_ERR_CGI_PARAMS;
@@ -762,7 +816,7 @@ jb_err get_number_param(struct client_state *csp,
    assert(name);
    assert(pvalue);
 
-   *pvalue = 0; 
+   *pvalue = 0;
 
    param = lookup(parameters, name);
    if (!*param)
@@ -854,7 +908,7 @@ struct http_response *error_response(struct client_state *csp,
    if (!err) err = map(exports, "host", 1, html_encode(csp->http->host), 0);
    if (!err) err = map(exports, "hostport", 1, html_encode(csp->http->hostport), 0);
    if (!err) err = map(exports, "path", 1, html_encode_and_free_original(path), 0);
-   if (!err) err = map(exports, "protocol", 1, csp->http->ssl ? "https://" : "http://", 1); 
+   if (!err) err = map(exports, "protocol", 1, csp->http->ssl ? "https://" : "http://", 1);
    if (!err)
    {
      err = map(exports, "host-ip", 1, html_encode(csp->http->host_ip_addr_str), 0);
@@ -876,7 +930,7 @@ struct http_response *error_response(struct client_state *csp,
    if (!strcmp(templatename, "no-such-domain"))
    {
       rsp->status = strdup("404 No such domain");
-      rsp->reason = RSP_REASON_NO_SUCH_DOMAIN;
+      rsp->crunch_reason = NO_SUCH_DOMAIN;
    }
    else if (!strcmp(templatename, "forwarding-failed"))
    {
@@ -924,36 +978,39 @@ struct http_response *error_response(struct client_state *csp,
          case SOCKS_5:
             socks_type = "socks5-";
             break;
+         case SOCKS_5T:
+            socks_type = "socks5t-";
+            break;
          default:
             log_error(LOG_LEVEL_FATAL, "Unknown socks type: %d.", fwd->type);
       }
 
       if (!err) err = map(exports, "forwarding-type", 1, socks_type, 1);
       if (!err) err = map(exports, "error-message", 1, html_encode(csp->error_message), 0);
-
       if ((NULL == csp->error_message) || err)
       {
          free_map(exports);
          free_http_response(rsp);
          return cgi_error_memory();
       }
-      if (!err) rsp->status = strdup("503 Forwarding failure");
-      rsp->reason = RSP_REASON_FORWARDING_FAILED;
+
+      rsp->status = strdup("503 Forwarding failure");
+      rsp->crunch_reason = FORWARDING_FAILED;
    }
    else if (!strcmp(templatename, "connect-failed"))
    {
       rsp->status = strdup("503 Connect failed");
-      rsp->reason = RSP_REASON_CONNECT_FAILED;
+      rsp->crunch_reason = CONNECT_FAILED;
    }
    else if (!strcmp(templatename, "connection-timeout"))
    {
       rsp->status = strdup("504 Connection timeout");
-      rsp->reason = RSP_REASON_CONNECTION_TIMEOUT;
+      rsp->crunch_reason = CONNECTION_TIMEOUT;
    }
    else if (!strcmp(templatename, "no-server-data"))
    {
       rsp->status = strdup("502 No data received from server or forwarder");
-      rsp->reason = RSP_REASON_NO_SERVER_DATA;
+      rsp->crunch_reason = NO_SERVER_DATA;
    }
 
    if (rsp->status == NULL)
@@ -1037,23 +1094,23 @@ void cgi_init_error_messages(void)
       "Content-Type: text/html\r\n"
       "\r\n";
    cgi_error_memory_response->body =
-      "<html>\r\n"
-      "<head>\r\n"
-      " <title>500 Internal Privoxy Error</title>\r\n"
+      "<html>\n"
+      "<head>\n"
+      " <title>500 Internal Privoxy Error</title>\n"
       " <link rel=\"shortcut icon\" href=\"" CGI_PREFIX "error-favicon.ico\" type=\"image/x-icon\">"
-      "</head>\r\n"
-      "<body>\r\n"
-      "<h1>500 Internal Privoxy Error</h1>\r\n"
-      "<p>Privoxy <b>ran out of memory</b> while processing your request.</p>\r\n"
-      "<p>Please contact your proxy administrator, or try again later</p>\r\n"
-      "</body>\r\n"
-      "</html>\r\n";
+      "</head>\n"
+      "<body>\n"
+      "<h1>500 Internal Privoxy Error</h1>\n"
+      "<p>Privoxy <b>ran out of memory</b> while processing your request.</p>\n"
+      "<p>Please contact your proxy administrator, or try again later</p>\n"
+      "</body>\n"
+      "</html>\n";
 
    cgi_error_memory_response->head_length =
       strlen(cgi_error_memory_response->head);
    cgi_error_memory_response->content_length =
       strlen(cgi_error_memory_response->body);
-   cgi_error_memory_response->reason = RSP_REASON_OUT_OF_MEMORY;
+   cgi_error_memory_response->crunch_reason = OUT_OF_MEMORY;
 }
 
 
@@ -1085,7 +1142,7 @@ struct http_response *cgi_error_memory(void)
  *
  * Description :  Almost-CGI function that is called if a template
  *                cannot be loaded.  Note this is not a true CGI,
- *                it takes a template name rather than a map of 
+ *                it takes a template name rather than a map of
  *                parameters.
  *
  * Parameters  :
@@ -1095,7 +1152,7 @@ struct http_response *cgi_error_memory(void)
  *                                be loaded.
  *
  * Returns     :  JB_ERR_OK on success
- *                JB_ERR_MEMORY on out-of-memory error.  
+ *                JB_ERR_MEMORY on out-of-memory error.
  *
  *********************************************************************/
 jb_err cgi_error_no_template(const struct client_state *csp,
@@ -1105,18 +1162,18 @@ jb_err cgi_error_no_template(const struct client_state *csp,
    static const char status[] =
       "500 Internal Privoxy Error";
    static const char body_prefix[] =
-      "<html>\r\n"
-      "<head>\r\n"
-      " <title>500 Internal Privoxy Error</title>\r\n"
+      "<html>\n"
+      "<head>\n"
+      " <title>500 Internal Privoxy Error</title>\n"
       " <link rel=\"shortcut icon\" href=\"" CGI_PREFIX "error-favicon.ico\" type=\"image/x-icon\">"
-      "</head>\r\n"
-      "<body>\r\n"
-      "<h1>500 Internal Privoxy Error</h1>\r\n"
-      "<p>Privoxy encountered an error while processing your request:</p>\r\n"
+      "</head>\n"
+      "<body>\n"
+      "<h1>500 Internal Privoxy Error</h1>\n"
+      "<p>Privoxy encountered an error while processing your request:</p>\n"
       "<p><b>Could not load template file <code>";
    static const char body_suffix[] =
-      "</code> or one of its included components.</b></p>\r\n"
-      "<p>Please contact your proxy administrator.</p>\r\n"
+      "</code> or one of its included components.</b></p>\n"
+      "<p>Please contact your proxy administrator.</p>\n"
       "<p>If you are the proxy administrator, please put the required file(s)"
       "in the <code><i>(confdir)</i>/templates</code> directory.  The "
       "location of the <code><i>(confdir)</i></code> directory "
@@ -1125,9 +1182,9 @@ jb_err cgi_error_no_template(const struct client_state *csp,
 #ifndef _WIN32
       ", or <code>/etc/privoxy/</code>"
 #endif /* ndef _WIN32 */
-      ").</p>\r\n"
-      "</body>\r\n"
-      "</html>\r\n";
+      ").</p>\n"
+      "</body>\n"
+      "</html>\n";
    const size_t body_size = strlen(body_prefix) + strlen(template_name) + strlen(body_suffix) + 1;
 
    assert(csp);
@@ -1142,11 +1199,7 @@ jb_err cgi_error_no_template(const struct client_state *csp,
    rsp->head_length = 0;
    rsp->is_static = 0;
 
-   rsp->body = malloc(body_size);
-   if (rsp->body == NULL)
-   {
-      return JB_ERR_MEMORY;
-   }
+   rsp->body = malloc_or_die(body_size);
    strlcpy(rsp->body, body_prefix, body_size);
    strlcat(rsp->body, template_name, body_size);
    strlcat(rsp->body, body_suffix, body_size);
@@ -1182,7 +1235,7 @@ jb_err cgi_error_no_template(const struct client_state *csp,
  *          3  :  error_to_report = Error code to report.
  *
  * Returns     :  JB_ERR_OK on success
- *                JB_ERR_MEMORY on out-of-memory error.  
+ *                JB_ERR_MEMORY on out-of-memory error.
  *
  *********************************************************************/
 jb_err cgi_error_unknown(const struct client_state *csp,
@@ -1192,28 +1245,24 @@ jb_err cgi_error_unknown(const struct client_state *csp,
    static const char status[] =
       "500 Internal Privoxy Error";
    static const char body_prefix[] =
-      "<html>\r\n"
-      "<head>\r\n"
-      " <title>500 Internal Privoxy Error</title>\r\n"
+      "<html>\n"
+      "<head>\n"
+      " <title>500 Internal Privoxy Error</title>\n"
       " <link rel=\"shortcut icon\" href=\"" CGI_PREFIX "error-favicon.ico\" type=\"image/x-icon\">"
-      "</head>\r\n"
-      "<body>\r\n"
-      "<h1>500 Internal Privoxy Error</h1>\r\n"
-      "<p>Privoxy encountered an error while processing your request:</p>\r\n"
+      "</head>\n"
+      "<body>\n"
+      "<h1>500 Internal Privoxy Error</h1>\n"
+      "<p>Privoxy encountered an error while processing your request:</p>\n"
       "<p><b>Unexpected internal error: ";
    static const char body_suffix[] =
-      "</b></p>\r\n"
+      "</b></p>\n"
       "<p>Please "
       "<a href=\"http://sourceforge.net/tracker/?group_id=11118&amp;atid=111118\">"
-      "file a bug report</a>.</p>\r\n"
-      "</body>\r\n"
-      "</html>\r\n";
-   char errnumbuf[30];
-   /*
-    * Due to sizeof(errnumbuf), body_size will be slightly
-    * bigger than necessary but it doesn't really matter.
-    */
-   const size_t body_size = strlen(body_prefix) + sizeof(errnumbuf) + strlen(body_suffix) + 1;
+      "file a bug report</a>.</p>\n"
+      "</body>\n"
+      "</html>\n";
+   /* Includes room for larger error numbers in the future. */
+   const size_t body_size = sizeof(body_prefix) + sizeof(body_suffix) + 5;
    assert(csp);
    assert(rsp);
 
@@ -1224,18 +1273,11 @@ jb_err cgi_error_unknown(const struct client_state *csp,
    rsp->content_length = 0;
    rsp->head_length = 0;
    rsp->is_static = 0;
-   rsp->reason = RSP_REASON_INTERNAL_ERROR;
+   rsp->crunch_reason = INTERNAL_ERROR;
 
-   snprintf(errnumbuf, sizeof(errnumbuf), "%d", error_to_report);
+   rsp->body = malloc_or_die(body_size);
 
-   rsp->body = malloc(body_size);
-   if (rsp->body == NULL)
-   {
-      return JB_ERR_MEMORY;
-   }
-   strlcpy(rsp->body, body_prefix, body_size);
-   strlcat(rsp->body, errnumbuf,   body_size);
-   strlcat(rsp->body, body_suffix, body_size);
+   snprintf(rsp->body, body_size, "%s%d%s", body_prefix, error_to_report, body_suffix);
 
    rsp->status = strdup(status);
    if (rsp->status == NULL)
@@ -1253,7 +1295,7 @@ jb_err cgi_error_unknown(const struct client_state *csp,
  *
  * Description :  CGI function that is called if the parameters
  *                (query string) for a CGI were wrong.
- *               
+ *
  * Parameters  :
  *          1  :  csp = Current client state (buffers, headers, etc...)
  *          2  :  rsp = http_response data structure for output
@@ -1261,7 +1303,7 @@ jb_err cgi_error_unknown(const struct client_state *csp,
  * CGI Parameters : none
  *
  * Returns     :  JB_ERR_OK on success
- *                JB_ERR_MEMORY on out-of-memory error.  
+ *                JB_ERR_MEMORY on out-of-memory error.
  *
  *********************************************************************/
 jb_err cgi_error_bad_param(const struct client_state *csp,
@@ -1283,7 +1325,7 @@ jb_err cgi_error_bad_param(const struct client_state *csp,
 
 /*********************************************************************
  *
- * Function    :  cgi_redirect 
+ * Function    :  cgi_redirect
  *
  * Description :  CGI support function to generate a HTTP redirect
  *                message
@@ -1295,7 +1337,7 @@ jb_err cgi_error_bad_param(const struct client_state *csp,
  * CGI Parameters : None
  *
  * Returns     :  JB_ERR_OK on success
- *                JB_ERR_MEMORY on out-of-memory error.  
+ *                JB_ERR_MEMORY on out-of-memory error.
  *
  *********************************************************************/
 jb_err cgi_redirect (struct http_response * rsp, const char *target)
@@ -1330,8 +1372,8 @@ jb_err cgi_redirect (struct http_response * rsp, const char *target)
  *                FIXME: I currently only work for actions, and would
  *                       like to be generalized for other topics.
  *
- * Parameters  :  
- *          1  :  item = item (will NOT be free()d.) 
+ * Parameters  :
+ *          1  :  item = item (will NOT be free()d.)
  *                       It is assumed to be HTML-safe.
  *          2  :  config = The current configuration.
  *
@@ -1362,7 +1404,7 @@ char *add_help_link(const char *item,
    string_join  (&result, string_toupper(item));
    string_append(&result, "\">");
    string_append(&result, item);
-   string_append(&result, "</a> ");
+   string_append(&result, "</a>");
 
    return result;
 }
@@ -1376,7 +1418,7 @@ char *add_help_link(const char *item,
  *                HTTP header - e.g.:
  *                "Sun, 06 Nov 1994 08:49:37 GMT"
  *
- * Parameters  :  
+ * Parameters  :
  *          1  :  time_offset = Time returned will be current time
  *                              plus this number of seconds.
  *          2  :  buf = Destination for result.
@@ -1389,12 +1431,6 @@ char *add_help_link(const char *item,
  *********************************************************************/
 void get_http_time(int time_offset, char *buf, size_t buffer_size)
 {
-   static const char day_names[7][4] =
-      { "Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat" };
-   static const char month_names[12][4] =
-      { "Jan", "Feb", "Mar", "Apr", "May", "Jun",
-        "Jul", "Aug", "Sep", "Oct", "Nov", "Dec" };
-
    struct tm *t;
    time_t current_time;
 #if defined(HAVE_GMTIME_R)
@@ -1419,17 +1455,7 @@ void get_http_time(int time_offset, char *buf, size_t buffer_size)
    t = gmtime(&current_time);
 #endif
 
-   /* Format: "Sun, 06 Nov 1994 08:49:37 GMT" */
-   snprintf(buf, buffer_size,
-      "%s, %02d %s %4d %02d:%02d:%02d GMT",
-      day_names[t->tm_wday],
-      t->tm_mday,
-      month_names[t->tm_mon],
-      t->tm_year + 1900,
-      t->tm_hour,
-      t->tm_min,
-      t->tm_sec
-      );
+   strftime(buf, buffer_size, "%a, %d %b %Y %H:%M:%S GMT", t);
 
 }
 
@@ -1479,6 +1505,58 @@ static void get_locale_time(char *buf, size_t buffer_size)
 
 }
 
+
+#ifdef FEATURE_COMPRESSION
+/*********************************************************************
+ *
+ * Function    :  compress_buffer
+ *
+ * Description :  Compresses the content of a buffer with zlib's deflate
+ *                Allocates a new buffer for the result, free'ing it is
+ *                up to the caller.
+ *
+ * Parameters  :
+ *          1  :  buffer = buffer whose content should be compressed
+ *          2  :  buffer_length = length of the buffer
+ *          3  :  compression_level = compression level for compress2()
+ *
+ * Returns     :  NULL on error, otherwise a pointer to the compressed
+ *                content of the input buffer.
+ *
+ *********************************************************************/
+char *compress_buffer(char *buffer, size_t *buffer_length, int compression_level)
+{
+   char *compressed_buffer;
+   uLongf new_length;
+   assert(-1 <= compression_level && compression_level <= 9);
+
+   /* Let zlib figure out the maximum length of the compressed data */
+   new_length = compressBound((uLongf)*buffer_length);
+
+   compressed_buffer = malloc_or_die(new_length);
+
+   if (Z_OK != compress2((Bytef *)compressed_buffer, &new_length,
+         (Bytef *)buffer, *buffer_length, compression_level))
+   {
+      log_error(LOG_LEVEL_ERROR,
+         "compress2() failed. Buffer size: %d, compression level: %d.",
+         new_length, compression_level);
+      freez(compressed_buffer);
+      return NULL;
+   }
+
+   log_error(LOG_LEVEL_RE_FILTER,
+      "Compressed content from %d to %d bytes. Compression level: %d",
+      *buffer_length, new_length, compression_level);
+
+   *buffer_length = (size_t)new_length;
+
+   return compressed_buffer;
+
+}
+#endif
+
+
 /*********************************************************************
  *
  * Function    :  finish_http_response
@@ -1495,7 +1573,7 @@ static void get_locale_time(char *buf, size_t buffer_size)
  *                On error, free()s rsp and returns cgi_error_memory()
  *
  *********************************************************************/
-struct http_response *finish_http_response(const struct client_state *csp, struct http_response *rsp)
+struct http_response *finish_http_response(struct client_state *csp, struct http_response *rsp)
 {
    char buf[BUFFER_SIZE];
    jb_err err;
@@ -1508,7 +1586,7 @@ struct http_response *finish_http_response(const struct client_state *csp, struc
       return rsp;
    }
 
-   /* 
+   /*
     * Fill in the HTTP Status, using HTTP/1.1
     * unless the client asked for HTTP/1.0.
     */
@@ -1517,16 +1595,39 @@ struct http_response *finish_http_response(const struct client_state *csp, struc
       rsp->status ? rsp->status : "200 OK");
    err = enlist_first(rsp->headers, buf);
 
-   /* 
+   /*
     * Set the Content-Length
     */
    if (rsp->content_length == 0)
    {
       rsp->content_length = rsp->body ? strlen(rsp->body) : 0;
    }
+
+#ifdef FEATURE_COMPRESSION
+   if (!err && (csp->flags & CSP_FLAG_CLIENT_SUPPORTS_DEFLATE)
+      && (rsp->content_length > LOWER_LENGTH_LIMIT_FOR_COMPRESSION))
+   {
+      char *compressed_content;
+
+      compressed_content = compress_buffer(rsp->body, &rsp->content_length,
+         csp->config->compression_level);
+      if (NULL != compressed_content)
+      {
+         freez(rsp->body);
+         rsp->body = compressed_content;
+         err = enlist_unique_header(rsp->headers, "Content-Encoding", "deflate");
+      }
+   }
+#endif
+
    if (!err)
    {
       snprintf(buf, sizeof(buf), "Content-Length: %d", (int)rsp->content_length);
+      /*
+       * Signal serve() that the client will be able to figure out
+       * the end of the response without having to close the connection.
+       */
+      csp->flags |= CSP_FLAG_SERVER_CONTENT_LENGTH_SET;
       err = enlist(rsp->headers, buf);
    }
 
@@ -1565,7 +1666,7 @@ struct http_response *finish_http_response(const struct client_state *csp, struc
     * Last-Modified: set to date/time the page was last changed.
     * Expires: set to date/time page next needs reloading.
     * Cache-Control: set to "no-cache" if applicable.
-    * 
+    *
     * See http://www.w3.org/Protocols/rfc2068/rfc2068
     */
    if (rsp->is_static)
@@ -1622,7 +1723,9 @@ struct http_response *finish_http_response(const struct client_state *csp, struc
       if (!err) err = enlist_unique_header(rsp->headers, "Date", buf);
       if (!strncmpic(rsp->status, "403", 3)
        || !strncmpic(rsp->status, "404", 3)
-       || !strncmpic(rsp->status, "503", 3))
+       || !strncmpic(rsp->status, "502", 3)
+       || !strncmpic(rsp->status, "503", 3)
+       || !strncmpic(rsp->status, "504", 3))
       {
          if (!err) err = enlist_unique_header(rsp->headers, "Last-Modified", "Wed, 08 Jun 1955 12:00:00 GMT");
       }
@@ -1634,15 +1737,13 @@ struct http_response *finish_http_response(const struct client_state *csp, struc
       if (!err) err = enlist_unique_header(rsp->headers, "Pragma", "no-cache");
    }
 
-   /*
-    * Quoting RFC 2616:
-    *
-    * HTTP/1.1 applications that do not support persistent connections MUST
-    * include the "close" connection option in every message.
-    */
-   if (!err) err = enlist_unique_header(rsp->headers, "Connection", "close");
+   if (!err && (!(csp->flags & CSP_FLAG_CLIENT_CONNECTION_KEEP_ALIVE)
+              || (csp->flags & CSP_FLAG_SERVER_SOCKET_TAINTED)))
+   {
+      err = enlist_unique_header(rsp->headers, "Connection", "close");
+   }
 
-   /* 
+   /*
     * Write the head
     */
    if (err || (NULL == (rsp->head = list_to_text(rsp->headers))))
@@ -1722,11 +1823,11 @@ void free_http_response(struct http_response *rsp)
  *                            following an #include statament
  *
  * Returns     :  JB_ERR_OK on success
- *                JB_ERR_MEMORY on out-of-memory error.  
+ *                JB_ERR_MEMORY on out-of-memory error.
  *                JB_ERR_FILE if the template file cannot be read
  *
  *********************************************************************/
-jb_err template_load(const struct client_state *csp, char **template_ptr, 
+jb_err template_load(const struct client_state *csp, char **template_ptr,
                      const char *templatename, int recursive)
 {
    jb_err err;
@@ -1808,7 +1909,7 @@ jb_err template_load(const struct client_state *csp, char **template_ptr,
    }
    free(full_path);
 
-   /* 
+   /*
     * Read the file, ignoring comments, and honoring #include
     * statements, unless we're already called recursively.
     *
@@ -1863,7 +1964,7 @@ jb_err template_load(const struct client_state *csp, char **template_ptr,
  *                HTML template by replacing @name@ with value using
  *                pcrs, for each item in the output map.
  *
- *                Note that a leading '$' charachter in the export map's
+ *                Note that a leading '$' character in the export map's
  *                values will be stripped and toggle on backreference
  *                interpretation.
  *
@@ -1896,7 +1997,7 @@ jb_err template_fill(char **template_ptr, const struct map *exports)
    file_buffer = *template_ptr;
    size = strlen(file_buffer) + 1;
 
-   /* 
+   /*
     * Assemble pcrs joblist from exports map
     */
    for (m = exports->first; m != NULL; m = m->next)
@@ -1914,7 +2015,7 @@ jb_err template_fill(char **template_ptr, const struct map *exports)
       else
       {
          /*
-          * Treat the "replace with" text as a literal string - 
+          * Treat the "replace with" text as a literal string -
           * no quoting needed, no backreferences allowed.
           * ("Trivial" ['T'] flag).
           */
@@ -1928,7 +2029,7 @@ jb_err template_fill(char **template_ptr, const struct map *exports)
 
       /* Make and run job. */
       job = pcrs_compile(buf, m->value, flags,  &error);
-      if (job == NULL) 
+      if (job == NULL)
       {
          if (error == PCRS_ERR_NOMEM)
          {
@@ -1955,10 +2056,10 @@ jb_err template_fill(char **template_ptr, const struct map *exports)
 
          if (error < 0)
          {
-            /* 
+            /*
              * Substitution failed, keep the original buffer,
              * log the problem and ignore it.
-             * 
+             *
              * The user might see some unresolved @CGI_VARIABLES@,
              * but returning a special CGI error page seems unreasonable
              * and could mask more important error messages.
@@ -2010,7 +2111,7 @@ jb_err template_fill_for_cgi(const struct client_state *csp,
                              struct http_response *rsp)
 {
    jb_err err;
-   
+
    assert(csp);
    assert(templatename);
    assert(exports);
@@ -2055,6 +2156,7 @@ struct map *default_exports(const struct client_state *csp, const char *caller)
    struct map * exports;
    int local_help_exists = 0;
    char *ip_address = NULL;
+   char *port = NULL;
    char *hostname = NULL;
 
    assert(csp);
@@ -2067,12 +2169,12 @@ struct map *default_exports(const struct client_state *csp, const char *caller)
 
    if (csp->config->hostname)
    {
-      get_host_information(csp->cfd, &ip_address, NULL);
+      get_host_information(csp->cfd, &ip_address, &port, NULL);
       hostname = strdup(csp->config->hostname);
    }
    else
    {
-      get_host_information(csp->cfd, &ip_address, &hostname);
+      get_host_information(csp->cfd, &ip_address, &port, &hostname);
    }
 
    err = map(exports, "version", 1, html_encode(VERSION), 0);
@@ -2080,6 +2182,8 @@ struct map *default_exports(const struct client_state *csp, const char *caller)
    if (!err) err = map(exports, "time",          1, html_encode(buf), 0);
    if (!err) err = map(exports, "my-ip-address", 1, html_encode(ip_address ? ip_address : "unknown"), 0);
    freez(ip_address);
+   if (!err) err = map(exports, "my-port",       1, html_encode(port ? port : "unknown"), 0);
+   freez(port);
    if (!err) err = map(exports, "my-hostname",   1, html_encode(hostname ? hostname : "unknown"), 0);
    freez(hostname);
    if (!err) err = map(exports, "homepage",      1, html_encode(HOME_PAGE_URL), 0);
@@ -2104,10 +2208,7 @@ struct map *default_exports(const struct client_state *csp, const char *caller)
    if (!err) err = map_block_killer(exports, "can-toggle");
 #endif
 
-   snprintf(buf, sizeof(buf), "%d", csp->config->hport);
-   if (!err) err = map(exports, "my-port", 1, buf, 1);
-
-   if(!strcmp(CODE_STATUS, "stable"))
+   if (!strcmp(CODE_STATUS, "stable"))
    {
       if (!err) err = map_block_killer(exports, "unstable");
    }
@@ -2157,12 +2258,12 @@ struct map *default_exports(const struct client_state *csp, const char *caller)
  *                "if-<name>-start.*if-<name>-end" to the given
  *                export list.
  *
- * Parameters  :  
+ * Parameters  :
  *          1  :  exports = map to extend
  *          2  :  name = name of conditional block
  *
  * Returns     :  JB_ERR_OK on success
- *                JB_ERR_MEMORY on out-of-memory error.  
+ *                JB_ERR_MEMORY on out-of-memory error.
  *
  *********************************************************************/
 jb_err map_block_killer(struct map *exports, const char *name)
@@ -2186,12 +2287,12 @@ jb_err map_block_killer(struct map *exports, const char *name)
  *                by map-block-killer, to save a few bytes.
  *                i.e. removes "@if-<name>-start@" and "@if-<name>-end@"
  *
- * Parameters  :  
+ * Parameters  :
  *          1  :  exports = map to extend
  *          2  :  name = name of conditional block
  *
  * Returns     :  JB_ERR_OK on success
- *                JB_ERR_MEMORY on out-of-memory error.  
+ *                JB_ERR_MEMORY on out-of-memory error.
  *
  *********************************************************************/
 jb_err map_block_keep(struct map *exports, const char *name)
@@ -2232,13 +2333,13 @@ jb_err map_block_keep(struct map *exports, const char *name)
  *                The control structure and one of the alternatives
  *                will be hidden.
  *
- * Parameters  :  
+ * Parameters  :
  *          1  :  exports = map to extend
  *          2  :  name = name of conditional block
  *          3  :  choose_first = nonzero for first, zero for second.
  *
  * Returns     :  JB_ERR_OK on success
- *                JB_ERR_MEMORY on out-of-memory error.  
+ *                JB_ERR_MEMORY on out-of-memory error.
  *
  *********************************************************************/
 jb_err map_conditional(struct map *exports, const char *name, int choose_first)
@@ -2270,7 +2371,7 @@ jb_err map_conditional(struct map *exports, const char *name, int choose_first)
  *
  * Function    :  make_menu
  *
- * Description :  Returns an HTML-formatted menu of the available 
+ * Description :  Returns an HTML-formatted menu of the available
  *                unhidden CGIs, excluding the one given in <self>
  *                and the toggle CGI if toggling is disabled.
  *
@@ -2278,7 +2379,7 @@ jb_err map_conditional(struct map *exports, const char *name, int choose_first)
  *          1  :  self = name of CGI to leave out, can be NULL for
  *                complete listing.
  *          2  :  feature_flags = feature bitmap from csp->config
- *                
+ *
  *
  * Returns     :  menu string, or NULL on out-of-memory error.
  *
@@ -2319,7 +2420,7 @@ char *make_menu(const char *self, const unsigned feature_flags)
          html_encoded_prefix = html_encode(CGI_PREFIX);
          if (html_encoded_prefix == NULL)
          {
-            return NULL;  
+            return NULL;
          }
          else
          {