Add ProxiedHost and ProxiedPort options.

docs/man5/tinyproxy.conf.txt.in

@@ -342,6 +342,11 @@ ReversePath "/example/" "http://www.example.com/"
     types into his/her browser).  If this option is not set then
     no rewriting of redirects occurs.
 
+*ProxiedHost*::
+*ProxiedPort*::
+
+    The host name and the port to which all requests from clients
+    are sent. If ProxiedHost is set, ProxiedPort must be set, too.
 
 BUGS
 ----

etc/tinyproxy.conf.in

@@ -346,5 +346,9 @@ ViaProxyName "tinyproxy"
 #
 #ReverseBaseURL "http://localhost:8888/"
 
-
+#
-
+# The host and port to which all requests are sent.
+# If ProxiedHost is set, ProxiedPort must be set.
+#
+#ProxiedHost "some.proxied.host.com"
+#ProxiedPort 8080

src/conf.c

@@ -1,6 +1,7 @@
 /* tinyproxy - A fast light-weight HTTP proxy
  * Copyright (C) 2004 Robert James Kaes <rjkaes@users.sourceforge.net>
  * Copyright (C) 2009 Michael Adam <obnox@samba.org>
+ * Copyright (C) 2019 Kaito Yamada <kaitoy@pcap4j.org>
  *
  * 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
@@ -169,6 +170,9 @@ static HANDLE_FUNC (handle_upstream_no);
 
 static void config_free_regex (void);
 
+static HANDLE_FUNC (handle_proxiedhost);
+static HANDLE_FUNC (handle_proxiedport);
+
 /*
  * This macro can be used to make standard directives in the form:
  *   directive arguments [arguments ...]
@@ -210,6 +214,7 @@ struct {
         STDCONF ("statfile", STR, handle_statfile),
         STDCONF ("stathost", STR, handle_stathost),
         STDCONF ("xtinyproxy",  BOOL, handle_xtinyproxy),
+        STDCONF ("proxiedhost", STR, handle_proxiedhost),
         /* boolean arguments */
         STDCONF ("syslog", BOOL, handle_syslog),
         STDCONF ("bindsame", BOOL, handle_bindsame),
@@ -223,6 +228,7 @@ struct {
         STDCONF ("maxrequestsperchild", INT, handle_maxrequestsperchild),
         STDCONF ("timeout", INT, handle_timeout),
         STDCONF ("connectport", INT, handle_connectport),
+        STDCONF ("proxiedport", INT, handle_proxiedport),
         /* alphanumeric arguments */
         STDCONF ("user", ALNUM, handle_user),
         STDCONF ("group", ALNUM, handle_group),
@@ -731,6 +737,18 @@ static HANDLE_FUNC (handle_viaproxyname)
         return 0;
 }
 
+static HANDLE_FUNC (handle_proxiedhost)
+{
+        int r = set_string_arg (&conf->proxied_host, line, &match[2]);
+
+        if (r)
+                return r;
+        log_message (LOG_INFO,
+                     "Setting proxied host to '%s'",
+                     conf->proxied_host);
+        return 0;
+}
+
 static HANDLE_FUNC (handle_disableviaheader)
 {
         int r = set_bool_arg (&conf->disable_viaheader, line, &match[2]);
@@ -803,6 +821,19 @@ static HANDLE_FUNC (handle_port)
         return 0;
 }
 
+static HANDLE_FUNC (handle_proxiedport)
+{
+        set_int_arg (&conf->proxied_port, line, &match[2]);
+
+        if (conf->proxied_port > 65535) {
+                fprintf (stderr, "Bad port number (%d) supplied for ProxiedPort.\n",
+                         conf->proxied_port);
+                return 1;
+        }
+
+        return 0;
+}
+
 static HANDLE_FUNC (handle_maxclients)
 {
         child_configure (CHILD_MAXCLIENTS, get_long_arg (line, &match[2]));

src/conf.h

@@ -1,6 +1,7 @@
 /* tinyproxy - A fast light-weight HTTP proxy
  * Copyright (C) 2004 Robert James Kaes <rjkaes@users.sourceforge.net>
  * Copyright (C) 2009 Michael Adam <obnox@samba.org>
+ * Copyright (C) 2019 Kaito Yamada <kaitoy@pcap4j.org>
  *
  * 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
@@ -111,6 +112,13 @@ struct config_s {
          * Extra headers to be added to outgoing HTTP requests.
          */
         vector_t add_headers;
+
+        /*
+         * The proxied host and port.
+         * All requests are sent to it regardless of their original destination.
+         */
+        char *proxied_host;
+        unsigned int proxied_port;
 };
 
 extern int reload_config_file (const char *config_fname, struct config_s *conf,

src/reqs.c

@@ -3,6 +3,7 @@
  * Copyright (C) 1999-2005 Robert James Kaes <rjkaes@users.sourceforge.net>
  * Copyright (C) 2000 Chris Lightfoot <chris@ex-parrot.com>
  * Copyright (C) 2002 Petr Lampa <lampa@fit.vutbr.cz>
+ * Copyright (C) 2019 Kaito Yamada <kaitoy@pcap4j.org>
  *
  * 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
@@ -1679,8 +1680,13 @@ e401:
                         goto fail;
                 }
         } else {
-                connptr->server_fd = opensock (request->host, request->port,
+                if (config.proxied_host) {
-                                               connptr->server_ip_addr);
+                        connptr->server_fd = opensock (config.proxied_host, config.proxied_port,
+                                                       connptr->server_ip_addr);
+                } else {
+                        connptr->server_fd = opensock (request->host, request->port,
+                                                       connptr->server_ip_addr);
+                }
                 if (connptr->server_fd < 0) {
                         indicate_http_error (connptr, 500, "Unable to connect",
                                              "detail",