Bump copyright
[privoxy.git] / loadcfg.c
index 1fe2437..0203e97 100644 (file)
--- a/loadcfg.c
+++ b/loadcfg.c
@@ -1,4 +1,4 @@
-const char loadcfg_rcs[] = "$Id: loadcfg.c,v 1.123 2012/03/04 11:49:24 fabiankeil Exp $";
+const char loadcfg_rcs[] = "$Id: loadcfg.c,v 1.155 2017/02/20 13:44:32 fabiankeil Exp $";
 /*********************************************************************
  *
  * File        :  $Source: /cvsroot/ijbswa/current/loadcfg.c,v $
@@ -8,7 +8,7 @@ const char loadcfg_rcs[] = "$Id: loadcfg.c,v 1.123 2012/03/04 11:49:24 fabiankei
  *                routine to load the configuration and the global
  *                variables it writes to.
  *
- * Copyright   :  Written by and Copyright (C) 2001-2009 the
+ * Copyright   :  Written by and Copyright (C) 2001-2016 the
  *                Privoxy team. http://www.privoxy.org/
  *
  *                Based on the Internet Junkbuster originally written
@@ -53,6 +53,7 @@ const char loadcfg_rcs[] = "$Id: loadcfg.c,v 1.123 2012/03/04 11:49:24 fabiankei
 # ifndef STRICT
 #  define STRICT
 # endif
+# include <winsock2.h>
 # include <windows.h>
 
 # include "win32.h"
@@ -85,6 +86,9 @@ const char loadcfg_rcs[] = "$Id: loadcfg.c,v 1.123 2012/03/04 11:49:24 fabiankei
 #include "urlmatch.h"
 #include "cgi.h"
 #include "gateway.h"
+#ifdef FEATURE_CLIENT_TAGS
+#include "client-tags.h"
+#endif
 
 const char loadcfg_h_rcs[] = LOADCFG_H_VERSION;
 
@@ -123,6 +127,9 @@ static struct file_list *current_configfile = NULL;
 #define hash_admin_address               4112573064U /* "admin-address" */
 #define hash_allow_cgi_request_crunching  258915987U /* "allow-cgi-request-crunching" */
 #define hash_buffer_limit                1881726070U /* "buffer-limit */
+#define hash_client_header_order         2701453514U /* "client-header-order" */
+#define hash_client_specific_tag         3353703383U /* "client-specific-tag" */
+#define hash_client_tag_lifetime          647957580U /* "client-tag-lifetime" */
 #define hash_compression_level           2464423563U /* "compression-level" */
 #define hash_confdir                        1978389U /* "confdir" */
 #define hash_connection_sharing          1348841265U /* "connection-sharing" */
@@ -131,6 +138,7 @@ static struct file_list *current_configfile = NULL;
 #define hash_deny_access                 1227333715U /* "deny-access" */
 #define hash_enable_edit_actions         2517097536U /* "enable-edit-actions" */
 #define hash_enable_compression          3943696946U /* "enable-compression" */
+#define hash_enable_proxy_authentication_forwarding 4040610791U /* enable-proxy-authentication-forwarding */
 #define hash_enable_remote_toggle        2979744683U /* "enable-remote-toggle" */
 #define hash_enable_remote_http_toggle    110543988U /* "enable-remote-http-toggle" */
 #define hash_enforce_blocks              1862427469U /* "enforce-blocks" */
@@ -139,6 +147,7 @@ static struct file_list *current_configfile = NULL;
 #define hash_forward_socks4              3963965521U /* "forward-socks4" */
 #define hash_forward_socks4a             2639958518U /* "forward-socks4a" */
 #define hash_forward_socks5              3963965522U /* "forward-socks5" */
+#define hash_forward_socks5t             2639958542U /* "forward-socks5t" */
 #define hash_forwarded_connect_retries    101465292U /* "forwarded-connect-retries" */
 #define hash_handle_as_empty_returns_ok  1444873247U /* "handle-as-empty-doc-returns-ok" */
 #define hash_hostname                      10308071U /* "hostname" */
@@ -154,8 +163,12 @@ static struct file_list *current_configfile = NULL;
 #define hash_split_large_cgi_forms        671658948U /* "split-large-cgi-forms" */
 #define hash_suppress_blocklists         1948693308U /* "suppress-blocklists" */
 #define hash_templdir                      11067889U /* "templdir" */
+#define hash_temporary_directory         1824125181U /* "temporary-directory" */
+#define hash_tolerate_pipelining         1360286620U /* "tolerate-pipelining" */
 #define hash_toggle                          447966U /* "toggle" */
 #define hash_trust_info_url               430331967U /* "trust-info-url" */
+#define hash_trust_x_forwarded_for       2971537414U /* "trust-x-forwarded-for" */
+#define hash_trusted_cgi_referrer        4270883427U /* "trusted-cgi-referrer" */
 #define hash_trustfile                     56494766U /* "trustfile" */
 #define hash_usermanual                  1416668518U /* "user-manual" */
 #define hash_activity_animation          1817904738U /* "activity-animation" */
@@ -171,6 +184,9 @@ static struct file_list *current_configfile = NULL;
 
 
 static void savearg(char *command, char *argument, struct configuration_spec * config);
+#ifdef FEATURE_CLIENT_TAGS
+static void free_client_specific_tags(struct client_tag_spec *tag_list);
+#endif
 
 /*********************************************************************
  *
@@ -205,7 +221,7 @@ static void unload_configfile (void * data)
    while (cur_fwd != NULL)
    {
       struct forward_spec * next_fwd = cur_fwd->next;
-      free_url_spec(cur_fwd->url);
+      free_pattern_spec(cur_fwd->url);
 
       freez(cur_fwd->gateway_host);
       freez(cur_fwd->forward_host);
@@ -218,6 +234,9 @@ static void unload_configfile (void * data)
    freez(config->logdir);
    freez(config->templdir);
    freez(config->hostname);
+#ifdef FEATURE_EXTERNAL_FILTERS
+   freez(config->temporary_directory);
+#endif
 
    for (i = 0; i < MAX_LISTENING_SOCKETS; i++)
    {
@@ -233,16 +252,23 @@ static void unload_configfile (void * data)
       freez(config->re_filterfile[i]);
    }
 
+   list_remove_all(config->ordered_client_headers);
+
    freez(config->admin_address);
    freez(config->proxy_info_url);
    freez(config->proxy_args);
    freez(config->usermanual);
+   freez(config->trusted_cgi_referrer);
 
 #ifdef FEATURE_TRUST
    freez(config->trustfile);
    list_remove_all(config->trust_info);
 #endif /* def FEATURE_TRUST */
 
+#ifdef FEATURE_CLIENT_TAGS
+   free_client_specific_tags(config->client_tags);
+#endif
+
    freez(config);
 }
 
@@ -271,6 +297,126 @@ void unload_current_config_file(void)
 #endif
 
 
+#ifdef FEATURE_CLIENT_TAGS
+/*********************************************************************
+ *
+ * Function    :  register_tag
+ *
+ * Description :  Registers a client-specific-tag and its description
+ *
+ * Parameters  :
+ *          1  :  config: The tag list
+ *          2  :  name:  The name of the client-specific-tag
+ *          3  :  description: The human-readable description for the tag
+ *
+ * Returns     :  N/A
+ *
+ *********************************************************************/
+static void register_tag(struct client_tag_spec *tag_list,
+   const char *name, const char *description)
+{
+   struct client_tag_spec *new_tag;
+   struct client_tag_spec *last_tag;
+
+   last_tag = tag_list;
+   while (last_tag->next != NULL)
+   {
+      last_tag = last_tag->next;
+   }
+   if (last_tag->name == NULL)
+   {
+      /* First entry */
+      new_tag = last_tag;
+   }
+   else
+   {
+      new_tag = zalloc_or_die(sizeof(struct client_tag_spec));
+   }
+   new_tag->name = strdup_or_die(name);
+   new_tag->description = strdup_or_die(description);
+   if (new_tag != last_tag)
+   {
+      last_tag->next = new_tag;
+   }
+}
+
+
+/*********************************************************************
+ *
+ * Function    :  free_client_specific_tags
+ *
+ * Description :  Frees client-specific tags and their descriptions
+ *
+ * Parameters  :
+ *          1  :  tag_list: The tag list to free
+ *
+ * Returns     :  N/A
+ *
+ *********************************************************************/
+static void free_client_specific_tags(struct client_tag_spec *tag_list)
+{
+   struct client_tag_spec *this_tag;
+   struct client_tag_spec *next_tag;
+
+   next_tag = tag_list;
+   do
+   {
+      this_tag = next_tag;
+      next_tag = next_tag->next;
+
+      freez(this_tag->name);
+      freez(this_tag->description);
+
+      if (this_tag != tag_list)
+      {
+         freez(this_tag);
+      }
+   } while (next_tag != NULL);
+}
+#endif /* def FEATURE_CLIENT_TAGS */
+
+
+/*********************************************************************
+ *
+ * Function    :  parse_numeric_value
+ *
+ * Description :  Parse the value of a directive that can only have
+ *                a single numeric value. Terminates with a fatal error
+ *                if the value is NULL or not numeric.
+ *
+ * Parameters  :
+ *          1  :  name:  The name of the directive. Used for log messages.
+ *          2  :  value: The value to parse
+ *
+ *
+ * Returns     :  The numerical value as integer
+ *
+ *********************************************************************/
+static int parse_numeric_value(const char *name, const char *value)
+{
+   int number;
+   char *endptr;
+
+   assert(name != NULL);
+   assert(value != NULL);
+
+   if ((value == NULL) || (*value == '\0'))
+   {
+      log_error(LOG_LEVEL_FATAL, "Directive %s used without argument", name);
+   }
+
+   number = (int)strtol(value, &endptr, 0);
+   if (*endptr != '\0')
+   {
+      log_error(LOG_LEVEL_FATAL,
+         "Directive '%s' used with non-numerical value: '%s'", name, value);
+   }
+
+   return number;
+
+}
+
+
 /*********************************************************************
  *
  * Function    :  parse_toggle_value
@@ -316,6 +462,76 @@ static int parse_toggle_state(const char *name, const char *value)
 }
 
 
+/*********************************************************************
+ *
+ * Function    :  parse_client_header_order
+ *
+ * Description :  Parse the value of the header-order directive
+ *
+ * Parameters  :
+ *          1  :  ordered_header_list:  List to insert the ordered
+ *                                      headers into.
+ *          2  :  ordered_headers:  The ordered header names separated
+ *                                  by spaces or tabs.
+ *
+ *
+ * Returns     :  N/A
+ *
+ *********************************************************************/
+static void parse_client_header_order(struct list *ordered_header_list, const char *ordered_headers)
+{
+   char *original_headers_copy;
+   char **vector;
+   size_t max_segments;
+   int number_of_headers;
+   int i;
+
+   assert(ordered_header_list != NULL);
+   assert(ordered_headers != NULL);
+
+   if (ordered_headers == NULL)
+   {
+      log_error(LOG_LEVEL_FATAL, "header-order used without argument");
+   }
+
+   /*
+    * 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.
+    */
+   max_segments = strlen(ordered_headers) / 2;
+   if (max_segments == 0)
+   {
+      max_segments = 1;
+   }
+   vector = malloc_or_die(max_segments * sizeof(char *));
+
+   original_headers_copy = strdup_or_die(ordered_headers);
+
+   number_of_headers = ssplit(original_headers_copy, "\t ", vector, max_segments);
+   if (number_of_headers == -1)
+   {
+      log_error(LOG_LEVEL_FATAL, "Failed to split ordered headers");
+   }
+
+   for (i = 0; i < number_of_headers; i++)
+   {
+      if (JB_ERR_OK != enlist(ordered_header_list, vector[i]))
+      {
+         log_error(LOG_LEVEL_FATAL,
+            "Failed to enlist ordered header: %s", vector[i]);
+      }
+   }
+
+   freez(vector);
+   freez(original_headers_copy);
+
+   return;
+
+}
+
+
 /*********************************************************************
  *
  * Function    :  load_config
@@ -363,15 +579,7 @@ struct configuration_spec * load_config(void)
    global_toggle_state = 1;
 #endif /* def FEATURE_TOGGLE */
 
-   fs->f = config = (struct configuration_spec *)zalloc(sizeof(*config));
-
-   if (NULL == config)
-   {
-      freez(fs->filename);
-      freez(fs);
-      log_error(LOG_LEVEL_FATAL, "can't allocate memory for configuration");
-      return NULL;
-   }
+   fs->f = config = zalloc_or_die(sizeof(*config));
 
    /*
     * This is backwards from how it's usually done.
@@ -389,10 +597,20 @@ struct configuration_spec * load_config(void)
     */
    config->multi_threaded            = 1;
    config->buffer_limit              = 4096 * 1024;
-   config->usermanual                = strdup(USER_MANUAL_URL);
-   config->proxy_args                = strdup("");
+   config->usermanual                = strdup_or_die(USER_MANUAL_URL);
+   config->proxy_args                = strdup_or_die("");
    config->forwarded_connect_retries = 0;
-   config->max_client_connections    = 0;
+#ifdef FEATURE_CLIENT_TAGS
+   config->client_tag_lifetime       = 60;
+#endif
+   config->trust_x_forwarded_for     = 0;
+   config->trusted_cgi_referrer      = NULL;
+   /*
+    * 128 client sockets ought to be enough for everybody who can't
+    * be bothered to read the documentation to figure out how to
+    * increase the limit.
+    */
+   config->max_client_connections    = 128;
    config->socket_timeout            = 300; /* XXX: Should be a macro. */
 #ifdef FEATURE_CONNECTION_KEEP_ALIVE
    config->default_server_timeout    = 0;
@@ -404,6 +622,7 @@ struct configuration_spec * load_config(void)
    config->feature_flags            &= ~RUNTIME_FEATURE_SPLIT_LARGE_FORMS;
    config->feature_flags            &= ~RUNTIME_FEATURE_ACCEPT_INTERCEPTED_REQUESTS;
    config->feature_flags            &= ~RUNTIME_FEATURE_EMPTY_DOC_RETURNS_OK;
+   config->feature_flags            &= ~RUNTIME_FEATURE_FORWARD_PROXY_AUTHENTICATION_HEADERS;
 #ifdef FEATURE_COMPRESSION
    config->feature_flags            &= ~RUNTIME_FEATURE_COMPRESSION;
    /*
@@ -411,6 +630,7 @@ struct configuration_spec * load_config(void)
     */
    config->compression_level         = 1;
 #endif
+   config->feature_flags            &= ~RUNTIME_FEATURE_TOLERATE_PIPELINING;
 
    configfp = fopen(configfile, "r");
    if (NULL == configfp)
@@ -492,7 +712,7 @@ struct configuration_spec * load_config(void)
                   "(You can increase this limit by changing MAX_AF_FILES in project.h and recompiling).",
                   MAX_AF_FILES);
             }
-            config->actions_file_short[i] = strdup(arg);
+            config->actions_file_short[i] = strdup_or_die(arg);
             config->actions_file[i] = make_path(config->confdir, arg);
 
             break;
@@ -515,7 +735,7 @@ struct configuration_spec * load_config(void)
  * *************************************************************************/
          case hash_admin_address :
             freez(config->admin_address);
-            config->admin_address = strdup(arg);
+            config->admin_address = strdup_or_die(arg);
             break;
 
 /* *************************************************************************
@@ -536,15 +756,77 @@ struct configuration_spec * load_config(void)
  * buffer-limit n
  * *************************************************************************/
          case hash_buffer_limit :
-            config->buffer_limit = (size_t)(1024 * atoi(arg));
+            config->buffer_limit = (size_t)(1024 * parse_numeric_value(cmd, arg));
+            break;
+
+/* *************************************************************************
+ * client-header-order header-1 header-2 ... header-n
+ * *************************************************************************/
+         case hash_client_header_order:
+            list_remove_all(config->ordered_client_headers);
+            parse_client_header_order(config->ordered_client_headers, arg);
+            break;
+
+/* *************************************************************************
+ * client-specific-tag tag-name description
+ * *************************************************************************/
+#ifdef FEATURE_CLIENT_TAGS
+         case hash_client_specific_tag:
+            {
+               char *name;
+               char *description;
+
+               name = arg;
+               description = strstr(arg, " ");
+               if (description == NULL)
+               {
+                  log_error(LOG_LEVEL_FATAL,
+                     "client-specific-tag '%s' lacks a description.", name);
+               }
+               *description = '\0';
+               /*
+                * The length is limited because we don't want truncated
+                * HTML caused by the cgi interface using static buffer
+                * sizes.
+                */
+               if (strlen(name) > CLIENT_TAG_LENGTH_MAX)
+               {
+                  log_error(LOG_LEVEL_FATAL,
+                     "client-specific-tag '%s' is longer than %d characters.",
+                     name, CLIENT_TAG_LENGTH_MAX);
+               }
+               description++;
+               register_tag(config->client_tags, name, description);
+            }
             break;
+#endif /* def FEATURE_CLIENT_TAGS */
+
+/* *************************************************************************
+ * client-tag-lifetime ttl
+ * *************************************************************************/
+#ifdef FEATURE_CLIENT_TAGS
+         case hash_client_tag_lifetime:
+         {
+            int ttl = parse_numeric_value(cmd, arg);
+            if (0 <= ttl)
+            {
+               config->client_tag_lifetime = (unsigned)ttl;
+            }
+            else
+            {
+               log_error(LOG_LEVEL_FATAL,
+                  "client-tag-lifetime can't be negative.");
+            }
+            break;
+         }
+#endif /* def FEATURE_CLIENT_TAGS */
 
 /* *************************************************************************
  * confdir directory-name
  * *************************************************************************/
          case hash_confdir :
             freez(config->confdir);
-            config->confdir = make_path( NULL, arg);
+            config->confdir = make_path(NULL, arg);
             break;
 
 /* *************************************************************************
@@ -552,25 +834,19 @@ struct configuration_spec * load_config(void)
  * *************************************************************************/
 #ifdef FEATURE_COMPRESSION
          case hash_compression_level :
-            if (*arg != '\0')
+         {
+            int compression_level = parse_numeric_value(cmd, arg);
+            if (-1 <= compression_level && compression_level <= 9)
             {
-               int compression_level = atoi(arg);
-               if (-1 <= compression_level && compression_level <= 9)
-               {
-                  config->compression_level = compression_level;;
-               }
-               else
-               {
-                  log_error(LOG_LEVEL_FATAL,
-                     "Invalid compression-level value: %s", arg);
-               }
+               config->compression_level = compression_level;
             }
             else
             {
                log_error(LOG_LEVEL_FATAL,
-                  "Invalid compression-level directive. Compression value missing");
+                  "Invalid compression-level value: %s", arg);
             }
             break;
+         }
 #endif
 
 /* *************************************************************************
@@ -594,7 +870,7 @@ struct configuration_spec * load_config(void)
  * Specifies debug level, multiple values are ORed together.
  * *************************************************************************/
          case hash_debug :
-            config->debug |= atoi(arg);
+            config->debug |= parse_numeric_value(cmd, arg);
             break;
 
 /* *************************************************************************
@@ -602,20 +878,19 @@ struct configuration_spec * load_config(void)
  * *************************************************************************/
 #ifdef FEATURE_CONNECTION_KEEP_ALIVE
          case hash_default_server_timeout :
-            if (*arg != '\0')
+         {
+            int timeout = parse_numeric_value(cmd, arg);
+            if (0 <= timeout)
             {
-               int timeout = atoi(arg);
-               if (0 < timeout)
-               {
-                  config->default_server_timeout = (unsigned int)timeout;
-               }
-               else
-               {
-                  log_error(LOG_LEVEL_FATAL,
-                     "Invalid default-server-timeout value: %s", arg);
-               }
+               config->default_server_timeout = (unsigned int)timeout;
+            }
+            else
+            {
+               log_error(LOG_LEVEL_FATAL,
+                  "Invalid default-server-timeout value: %s", arg);
             }
             break;
+         }
 #endif
 
 /* *************************************************************************
@@ -624,7 +899,7 @@ struct configuration_spec * load_config(void)
 #ifdef FEATURE_ACL
          case hash_deny_access:
             strlcpy(tmp, arg, sizeof(tmp));
-            vec_count = ssplit(tmp, " \t", vec, SZ(vec), 1, 1);
+            vec_count = ssplit(tmp, " \t", vec, SZ(vec));
 
             if ((vec_count != 1) && (vec_count != 2))
             {
@@ -637,14 +912,7 @@ struct configuration_spec * load_config(void)
             }
 
             /* allocate a new node */
-            cur_acl = (struct access_control_list *) zalloc(sizeof(*cur_acl));
-
-            if (cur_acl == NULL)
-            {
-               log_error(LOG_LEVEL_FATAL, "can't allocate memory for configuration");
-               /* Never get here - LOG_LEVEL_FATAL causes program exit */
-               break;
-            }
+            cur_acl = zalloc_or_die(sizeof(*cur_acl));
             cur_acl->action = ACL_DENY;
 
             if (acl_addr(vec[0], cur_acl->src) < 0)
@@ -732,6 +1000,19 @@ struct configuration_spec * load_config(void)
             break;
 #endif /* def FEATURE_COMPRESSION */
 
+/* *************************************************************************
+ * enable-proxy-authentication-forwarding 0|1
+ * *************************************************************************/
+         case hash_enable_proxy_authentication_forwarding:
+            if (parse_toggle_state(cmd, arg) == 1)
+            {
+               config->feature_flags |= RUNTIME_FEATURE_FORWARD_PROXY_AUTHENTICATION_HEADERS;
+            }
+            else
+            {
+               config->feature_flags &= ~RUNTIME_FEATURE_FORWARD_PROXY_AUTHENTICATION_HEADERS;
+            }
+            break;
 
 /* *************************************************************************
  * enable-remote-toggle 0|1
@@ -799,7 +1080,7 @@ struct configuration_spec * load_config(void)
                   "(You can increase this limit by changing MAX_AF_FILES in project.h and recompiling).",
                   MAX_AF_FILES);
             }
-            config->re_filterfile_short[i] = strdup(arg);
+            config->re_filterfile_short[i] = strdup_or_die(arg);
             config->re_filterfile[i] = make_path(config->confdir, arg);
 
             break;
@@ -809,7 +1090,7 @@ struct configuration_spec * load_config(void)
  * *************************************************************************/
          case hash_forward:
             strlcpy(tmp, arg, sizeof(tmp));
-            vec_count = ssplit(tmp, " \t", vec, SZ(vec), 1, 1);
+            vec_count = ssplit(tmp, " \t", vec, SZ(vec));
 
             if (vec_count != 2)
             {
@@ -822,24 +1103,18 @@ struct configuration_spec * load_config(void)
             }
 
             /* allocate a new node */
-            cur_fwd = zalloc(sizeof(*cur_fwd));
-            if (cur_fwd == NULL)
-            {
-               log_error(LOG_LEVEL_FATAL, "can't allocate memory for configuration");
-               /* Never get here - LOG_LEVEL_FATAL causes program exit */
-               break;
-            }
-
+            cur_fwd = zalloc_or_die(sizeof(*cur_fwd));
             cur_fwd->type = SOCKS_NONE;
 
             /* Save the URL pattern */
-            if (create_url_spec(cur_fwd->url, vec[0]))
+            if (create_pattern_spec(cur_fwd->url, vec[0]))
             {
                log_error(LOG_LEVEL_ERROR, "Bad URL specifier for forward "
                      "directive in configuration file.");
                string_append(&config->proxy_args,
                   "<br>\nWARNING: Bad URL specifier for "
                   "forward directive in configuration file.");
+               freez(cur_fwd);
                break;
             }
 
@@ -864,7 +1139,7 @@ struct configuration_spec * load_config(void)
  * *************************************************************************/
          case hash_forward_socks4:
             strlcpy(tmp, arg, sizeof(tmp));
-            vec_count = ssplit(tmp, " \t", vec, SZ(vec), 1, 1);
+            vec_count = ssplit(tmp, " \t", vec, SZ(vec));
 
             if (vec_count != 3)
             {
@@ -877,24 +1152,18 @@ struct configuration_spec * load_config(void)
             }
 
             /* allocate a new node */
-            cur_fwd = zalloc(sizeof(*cur_fwd));
-            if (cur_fwd == NULL)
-            {
-               log_error(LOG_LEVEL_FATAL, "can't allocate memory for configuration");
-               /* Never get here - LOG_LEVEL_FATAL causes program exit */
-               break;
-            }
-
+            cur_fwd = zalloc_or_die(sizeof(*cur_fwd));
             cur_fwd->type = SOCKS_4;
 
             /* Save the URL pattern */
-            if (create_url_spec(cur_fwd->url, vec[0]))
+            if (create_pattern_spec(cur_fwd->url, vec[0]))
             {
                log_error(LOG_LEVEL_ERROR, "Bad URL specifier for forward-socks4 "
                      "directive in configuration file.");
                string_append(&config->proxy_args,
                   "<br>\nWARNING: Bad URL specifier for "
                   "forward-socks4 directive in configuration file.");
+               freez(cur_fwd);
                break;
             }
 
@@ -930,45 +1199,52 @@ struct configuration_spec * load_config(void)
  * *************************************************************************/
          case hash_forward_socks4a:
          case hash_forward_socks5:
+         case hash_forward_socks5t:
             strlcpy(tmp, arg, sizeof(tmp));
-            vec_count = ssplit(tmp, " \t", vec, SZ(vec), 1, 1);
+            vec_count = ssplit(tmp, " \t", vec, SZ(vec));
 
             if (vec_count != 3)
             {
-               log_error(LOG_LEVEL_ERROR, "Wrong number of parameters for "
-                     "forward-socks4a directive in configuration file.");
+               log_error(LOG_LEVEL_ERROR,
+                  "Wrong number of parameters for %s in configuration file.",
+                  cmd);
                string_append(&config->proxy_args,
-                  "<br>\nWARNING: Wrong number of parameters for "
-                  "forward-socks4a directive in configuration file.");
+                  "<br>\nWARNING: Wrong number of parameters for ");
+               string_append(&config->proxy_args, cmd);
+               string_append(&config->proxy_args,
+                  "directive in configuration file.");
                break;
             }
 
             /* allocate a new node */
-            cur_fwd = zalloc(sizeof(*cur_fwd));
-            if (cur_fwd == NULL)
-            {
-               log_error(LOG_LEVEL_FATAL, "can't allocate memory for configuration");
-               /* Never get here - LOG_LEVEL_FATAL causes program exit */
-               break;
-            }
+            cur_fwd = zalloc_or_die(sizeof(*cur_fwd));
 
             if (directive_hash == hash_forward_socks4a)
             {
                cur_fwd->type = SOCKS_4A;
             }
-            else
+            else if (directive_hash == hash_forward_socks5)
             {
                cur_fwd->type = SOCKS_5;
             }
+            else
+            {
+               assert(directive_hash == hash_forward_socks5t);
+               cur_fwd->type = SOCKS_5T;
+            }
 
             /* Save the URL pattern */
-            if (create_url_spec(cur_fwd->url, vec[0]))
+            if (create_pattern_spec(cur_fwd->url, vec[0]))
             {
-               log_error(LOG_LEVEL_ERROR, "Bad URL specifier for forward-socks4a "
-                     "directive in configuration file.");
+               log_error(LOG_LEVEL_ERROR,
+                  "Bad URL specifier for %s in configuration file.",
+                  cmd);
                string_append(&config->proxy_args,
-                  "<br>\nWARNING: Bad URL specifier for "
-                  "forward-socks4a directive in configuration file.");
+                  "<br>\nWARNING: Bad URL specifier for ");
+               string_append(&config->proxy_args, cmd);
+               string_append(&config->proxy_args,
+                  "directive in configuration file.");
+               freez(cur_fwd);
                break;
             }
 
@@ -999,7 +1275,7 @@ struct configuration_spec * load_config(void)
  * forwarded-connect-retries n
  * *************************************************************************/
          case hash_forwarded_connect_retries :
-            config->forwarded_connect_retries = atoi(arg);
+            config->forwarded_connect_retries = parse_numeric_value(cmd, arg);
             break;
 
 /* *************************************************************************
@@ -1027,11 +1303,7 @@ struct configuration_spec * load_config(void)
  * *************************************************************************/
          case hash_hostname :
             freez(config->hostname);
-            config->hostname = strdup(arg);
-            if (NULL == config->hostname)
-            {
-               log_error(LOG_LEVEL_FATAL, "Out of memory saving hostname.");
-            }
+            config->hostname = strdup_or_die(arg);
             break;
 
 /* *************************************************************************
@@ -1039,20 +1311,19 @@ struct configuration_spec * load_config(void)
  * *************************************************************************/
 #ifdef FEATURE_CONNECTION_KEEP_ALIVE
          case hash_keep_alive_timeout :
-            if (*arg != '\0')
+         {
+            int timeout = parse_numeric_value(cmd, arg);
+            if (0 < timeout)
             {
-               int timeout = atoi(arg);
-               if (0 < timeout)
-               {
-                  config->feature_flags |= RUNTIME_FEATURE_CONNECTION_KEEP_ALIVE;
-                  config->keep_alive_timeout = (unsigned int)timeout;
-               }
-               else
-               {
-                  config->feature_flags &= ~RUNTIME_FEATURE_CONNECTION_KEEP_ALIVE;
-               }
+               config->feature_flags |= RUNTIME_FEATURE_CONNECTION_KEEP_ALIVE;
+               config->keep_alive_timeout = (unsigned int)timeout;
+            }
+            else
+            {
+               config->feature_flags &= ~RUNTIME_FEATURE_CONNECTION_KEEP_ALIVE;
             }
             break;
+         }
 #endif
 
 /* *************************************************************************
@@ -1071,11 +1342,7 @@ struct configuration_spec * load_config(void)
                   "(You can increase this limit by changing MAX_LISTENING_SOCKETS in project.h and recompiling).",
                   MAX_LISTENING_SOCKETS);
             }
-            config->haddr[i] = strdup(arg);
-            if (NULL == config->haddr[i])
-            {
-               log_error(LOG_LEVEL_FATAL, "Out of memory while copying listening address");
-            }
+            config->haddr[i] = strdup_or_die(arg);
             break;
 
 /* *************************************************************************
@@ -1105,15 +1372,46 @@ struct configuration_spec * load_config(void)
  * max-client-connections number
  * *************************************************************************/
          case hash_max_client_connections :
-            if (*arg != '\0')
+         {
+            int max_client_connections = parse_numeric_value(cmd, arg);
+
+#ifndef _WIN32
+            /*
+             * Reject values below 1 for obvious reasons and values above
+             * FD_SETSIZE/2 because Privoxy needs two sockets to serve
+             * client connections that need forwarding.
+             *
+             * We ignore the fact that the first three file descriptors
+             * are usually set to /dev/null, one is used for logging
+             * and yet another file descriptor is required to load
+             * config files.
+             */
+            if ((max_client_connections < 1) || (FD_SETSIZE/2 < max_client_connections))
             {
-               int max_client_connections = atoi(arg);
-               if (0 <= max_client_connections)
-               {
-                  config->max_client_connections = max_client_connections;
-               }
+               log_error(LOG_LEVEL_FATAL, "max-client-connections value %d"
+                  " is invalid. Value needs to be above 1 and below %d"
+                  " (FD_SETSIZE/2).", max_client_connections, FD_SETSIZE/2);
             }
+#else
+            /*
+             * The Windows libc uses FD_SETSIZE for an array used
+             * by select(), but has no problems with file descriptors
+             * above the limit as long as no more than FD_SETSIZE are
+             * passed to select().
+             * https://msdn.microsoft.com/en-us/library/windows/desktop/ms739169%28v=vs.85%29.aspx
+             *
+             * XXX: Do OS/2, Amiga etc. belong here as well?
+             */
+            if (max_client_connections < 1)
+            {
+               log_error(LOG_LEVEL_FATAL, "max-client-connections value"
+                  " has to be a number above 1. %d is invalid.",
+                  max_client_connections);
+            }
+#endif
+            config->max_client_connections = max_client_connections;
             break;
+         }
 
 /* *************************************************************************
  * permit-access source-ip[/significant-bits] [dest-ip[/significant-bits]]
@@ -1121,7 +1419,7 @@ struct configuration_spec * load_config(void)
 #ifdef FEATURE_ACL
          case hash_permit_access:
             strlcpy(tmp, arg, sizeof(tmp));
-            vec_count = ssplit(tmp, " \t", vec, SZ(vec), 1, 1);
+            vec_count = ssplit(tmp, " \t", vec, SZ(vec));
 
             if ((vec_count != 1) && (vec_count != 2))
             {
@@ -1135,14 +1433,7 @@ struct configuration_spec * load_config(void)
             }
 
             /* allocate a new node */
-            cur_acl = (struct access_control_list *) zalloc(sizeof(*cur_acl));
-
-            if (cur_acl == NULL)
-            {
-               log_error(LOG_LEVEL_FATAL, "can't allocate memory for configuration");
-               /* Never get here - LOG_LEVEL_FATAL causes program exit */
-               break;
-            }
+            cur_acl = zalloc_or_die(sizeof(*cur_acl));
             cur_acl->action = ACL_PERMIT;
 
             if (acl_addr(vec[0], cur_acl->src) < 0)
@@ -1203,34 +1494,32 @@ struct configuration_spec * load_config(void)
  * *************************************************************************/
          case hash_proxy_info_url :
             freez(config->proxy_info_url);
-            config->proxy_info_url = strdup(arg);
+            config->proxy_info_url = strdup_or_die(arg);
             break;
 
 /* *************************************************************************
- * single-threaded
+ * single-threaded 0|1
  * *************************************************************************/
          case hash_single_threaded :
-            config->multi_threaded = 0;
+            config->multi_threaded =  0 == parse_toggle_state(cmd, arg);
             break;
 
 /* *************************************************************************
  * socket-timeout numer_of_seconds
  * *************************************************************************/
          case hash_socket_timeout :
-            if (*arg != '\0')
+         {
+            int socket_timeout = parse_numeric_value(cmd, arg);
+            if (0 <= socket_timeout)
             {
-               int socket_timeout = atoi(arg);
-               if (0 < socket_timeout)
-               {
-                  config->socket_timeout = socket_timeout;
-               }
-               else
-               {
-                  log_error(LOG_LEVEL_FATAL,
-                     "Invalid socket-timeout: '%s'", arg);
-               }
+               config->socket_timeout = socket_timeout;
+            }
+            else
+            {
+               log_error(LOG_LEVEL_FATAL, "Invalid socket-timeout: '%s'", arg);
             }
             break;
+         }
 
 /* *************************************************************************
  * split-large-cgi-forms
@@ -1254,12 +1543,36 @@ struct configuration_spec * load_config(void)
             config->templdir = make_path(NULL, arg);
             break;
 
+#ifdef FEATURE_EXTERNAL_FILTERS
+/* *************************************************************************
+ * temporary-directory directory-name
+ * *************************************************************************/
+         case hash_temporary_directory :
+            freez(config->temporary_directory);
+            config->temporary_directory = make_path(NULL, arg);
+            break;
+#endif
+
+/* *************************************************************************
+ * tolerate-pipelining (0|1)
+ * *************************************************************************/
+         case hash_tolerate_pipelining :
+            if (parse_toggle_state(cmd, arg) == 1)
+            {
+               config->feature_flags |= RUNTIME_FEATURE_TOLERATE_PIPELINING;
+            }
+            else
+            {
+               config->feature_flags &= ~RUNTIME_FEATURE_TOLERATE_PIPELINING;
+            }
+            break;
+
 /* *************************************************************************
  * toggle (0|1)
  * *************************************************************************/
 #ifdef FEATURE_TOGGLE
          case hash_toggle :
-            global_toggle_state = atoi(arg);
+            global_toggle_state = parse_toggle_state(cmd, arg);
             break;
 #endif /* def FEATURE_TOGGLE */
 
@@ -1272,6 +1585,25 @@ struct configuration_spec * load_config(void)
             break;
 #endif /* def FEATURE_TRUST */
 
+/* *************************************************************************
+ * trust-x-forwarded-for (0|1)
+ * *************************************************************************/
+         case hash_trust_x_forwarded_for :
+            config->trust_x_forwarded_for = parse_toggle_state(cmd, arg);
+            break;
+
+/* *************************************************************************
+ * trusted-cgi-referrer http://www.example.org/some/path.html
+ * *************************************************************************/
+         case hash_trusted_cgi_referrer :
+            /*
+             * We don't validate the specified referrer as
+             * it's only used for string comparison.
+             */
+            freez(config->trusted_cgi_referrer);
+            config->trusted_cgi_referrer = strdup_or_die(arg);
+            break;
+
 /* *************************************************************************
  * trustfile filename
  * (In confdir by default.)
@@ -1293,7 +1625,7 @@ struct configuration_spec * load_config(void)
              * for the directives that were already parsed. Lame.
              */
             freez(config->usermanual);
-            config->usermanual = strdup(arg);
+            config->usermanual = strdup_or_die(arg);
             break;
 
 /* *************************************************************************
@@ -1319,21 +1651,21 @@ struct configuration_spec * load_config(void)
  * activity-animation (0|1)
  * *************************************************************************/
          case hash_activity_animation :
-            g_bShowActivityAnimation = atoi(arg);
+            g_bShowActivityAnimation = parse_toggle_state(cmd, arg);
             break;
 
 /* *************************************************************************
  *  close-button-minimizes (0|1)
  * *************************************************************************/
          case hash_close_button_minimizes :
-            g_bCloseHidesWindow = atoi(arg);
+            g_bCloseHidesWindow = parse_toggle_state(cmd, arg);
             break;
 
 /* *************************************************************************
  * log-buffer-size (0|1)
  * *************************************************************************/
          case hash_log_buffer_size :
-            g_bLimitBufferSize = atoi(arg);
+            g_bLimitBufferSize = parse_toggle_state(cmd, arg);
             break;
 
 /* *************************************************************************
@@ -1353,35 +1685,35 @@ struct configuration_spec * load_config(void)
  * log-font-size n
  * *************************************************************************/
          case hash_log_font_size :
-            g_nFontSize = atoi(arg);
+            g_nFontSize = parse_numeric_value(cmd, arg);
             break;
 
 /* *************************************************************************
  * log-highlight-messages (0|1)
  * *************************************************************************/
          case hash_log_highlight_messages :
-            g_bHighlightMessages = atoi(arg);
+            g_bHighlightMessages = parse_toggle_state(cmd, arg);
             break;
 
 /* *************************************************************************
  * log-max-lines n
  * *************************************************************************/
          case hash_log_max_lines :
-            g_nMaxBufferLines = atoi(arg);
+            g_nMaxBufferLines = parse_numeric_value(cmd, arg);
             break;
 
 /* *************************************************************************
  * log-messages (0|1)
  * *************************************************************************/
          case hash_log_messages :
-            g_bLogMessages = atoi(arg);
+            g_bLogMessages = parse_toggle_state(cmd, arg);
             break;
 
 /* *************************************************************************
  * show-on-task-bar (0|1)
  * *************************************************************************/
          case hash_show_on_task_bar :
-            g_bShowOnTaskBar = atoi(arg);
+            g_bShowOnTaskBar = parse_toggle_state(cmd, arg);
             break;
 
 #endif /* defined(_WIN32) && ! defined(_WIN_CONSOLE) */
@@ -1437,19 +1769,20 @@ struct configuration_spec * load_config(void)
              * error.  To change back to an error, just change log level
              * to LOG_LEVEL_FATAL.
              */
-            log_error(LOG_LEVEL_ERROR, "Ignoring unrecognized directive '%s' (%luul) in line %lu "
-                  "in configuration file (%s).",  buf, directive_hash, linenum, configfile);
+            log_error(LOG_LEVEL_ERROR, "Ignoring unrecognized directive "
+               "'%s' (%uU) in line %lu in configuration file (%s).",
+               buf, directive_hash, linenum, configfile);
             string_append(&config->proxy_args,
                " <strong class='warning'>Warning: Ignoring unrecognized directive:</strong>");
             break;
 
 /* *************************************************************************/
-      } /* end switch( hash_string(cmd) ) */
+      } /* end switch(hash_string(cmd)) */
 
       /* Save the argument for the show-status page. */
       savearg(cmd, arg, config);
       freez(buf);
-   } /* end while ( read_config_line(...) ) */
+   } /* end while (read_config_line(...)) */
 
    fclose(configfp);
 
@@ -1532,13 +1865,9 @@ struct configuration_spec * load_config(void)
    }
 #endif /* def FEATURE_TRUST */
 
-   if ( NULL == config->haddr[0] )
+   if (NULL == config->haddr[0])
    {
-      config->haddr[0] = strdup( HADDR_DEFAULT );
-      if (NULL == config->haddr[0])
-      {
-         log_error(LOG_LEVEL_FATAL, "Out of memory while copying default listening address");
-      }
+      config->haddr[0] = strdup_or_die(HADDR_DEFAULT);
    }
 
    for (i = 0; i < MAX_LISTENING_SOCKETS && NULL != config->haddr[i]; i++)
@@ -1579,7 +1908,7 @@ struct configuration_spec * load_config(void)
     *
     * Need to set up a fake csp, so they can get to the config.
     */
-   fake_csp = (struct client_state *) zalloc (sizeof(*fake_csp));
+   fake_csp = zalloc_or_die(sizeof(*fake_csp));
    fake_csp->config = config;
 
    if (run_loader(fake_csp))
@@ -1686,7 +2015,7 @@ static void savearg(char *command, char *argument, struct configuration_spec * c
     * Add config option name embedded in
     * link to its section in the user-manual
     */
-   buf = strdup("\n<a href=\"");
+   buf = strdup_or_die("\n<a href=\"");
    if (!strncmpic(config->usermanual, "file://", 7) ||
        !strncmpic(config->usermanual, "http", 4))
    {
@@ -1708,7 +2037,7 @@ static void savearg(char *command, char *argument, struct configuration_spec * c
       return;
    }
 
-   if ( (NULL != argument) && ('\0' != *argument) )
+   if ((NULL != argument) && ('\0' != *argument))
    {
       s = html_encode(argument);
       if (NULL == s)