-add new proxy code

3 files changed, 312 insertions, 1 deletions

diff --git a/src/gns/Makefile.am b/src/gns/Makefile.am
index 2e28a6a90..33b10c2bb 100644
--- a/src/gns/Makefile.am
+++ b/src/gns/Makefile.am
@@ -31,7 +31,8 @@ endif
 bin_PROGRAMS = \
   gnunet-service-gns \
   $(DO_FCFSD) \
-  gnunet-gns
+  gnunet-gns \
+        gnunet-gns-proxy
 
 #noinst_PROGRAMS = \
 #  gnunet-gns-lookup
@@ -203,6 +204,15 @@ gnunet_gns_LDADD = \
 gnunet_gns_DEPENDENCIES = \
   libgnunetgns.la
 
+gnunet_gns_proxy_SOURCES = \
+ gnunet-gns-proxy.c
+gnunet_gns_proxy_LDADD = \
+  $(top_builddir)/src/gns/libgnunetgns.la \
+  $(top_builddir)/src/util/libgnunetutil.la \
+  $(GN_LIBINTL)
+gnunet_gns_proxy_DEPENDENCIES = \
+  libgnunetgns.la
+
 gnunet_service_gns_SOURCES = \
  gnunet-service-gns.c \
  gnunet-service-gns_resolver.c \
diff --git a/src/gns/gns_proxy_proto.h b/src/gns/gns_proxy_proto.h
new file mode 100644
index 000000000..85a203d7d
--- /dev/null
+++ b/src/gns/gns_proxy_proto.h
@@ -0,0 +1,87 @@
+
+
+/* The socks phases */
+enum
+{
+  SOCKS5_INIT,
+  SOCKS5_REQUEST,
+  SOCKS5_DATA_TRANSFER
+};
+
+/* Client hello */
+struct socks5_client_hello
+{
+  uint8_t version;
+  uint8_t num_auth_methods;
+  char* auth_methods;
+};
+
+/* Client socks request */
+struct socks5_client_request
+{
+  uint8_t version;
+  uint8_t command;
+  uint8_t resvd;
+  uint8_t addr_type;
+  /* 
+   * followed by either an ip4/ipv6 address
+   * or a domain name with a length field in front
+   */
+};
+
+/* Server hello */
+struct socks5_server_hello
+{
+  uint8_t version;
+  uint8_t auth_method;
+};
+
+#define BUF_WAIT_FOR_CURL 0
+#define BUF_WAIT_FOR_MHD  1
+
+/* Struct used to store connection
+ * information
+ */
+struct socks5_bridge
+{
+  int fd;
+  struct socks5_bridge* remote_end;
+  struct sockaddr addr;
+  socklen_t addr_len;
+  char host[256];
+  int status;
+
+  /* This is an ssl bridge? */
+  int use_ssl;
+
+  /* if use_ssl=1 we have a daemon associated */
+  struct MHD_Daemon *ssl_daemon;
+  
+  /* http url + host */
+  char* full_url;
+
+  /* handle to curl */
+  //CURL* curl;
+
+  /* is response html? */
+  int res_is_html;
+
+  /* buffer structures */
+  pthread_t thread;
+  pthread_mutex_t m_done;
+  int is_done;
+  pthread_mutex_t m_buf;
+  //char MHD_CURL_BUF[CURL_MAX_WRITE_SIZE];
+  size_t MHD_CURL_BUF_SIZE;
+  int MHD_CURL_BUF_STATUS;
+};
+
+/* Server response to client requests */
+struct socks5_server_response
+{
+  uint8_t version;
+  uint8_t reply;
+  uint8_t reserved;
+  uint8_t addr_type;
+  uint8_t add_port[18];
+};
diff --git a/src/gns/gnunet-gns-proxy.c b/src/gns/gnunet-gns-proxy.c
new file mode 100644
index 000000000..a2e4ee6a5
--- /dev/null
+++ b/src/gns/gnunet-gns-proxy.c
@@ -0,0 +1,214 @@
+/*
+     This file is part of GNUnet.
+     (C) 2012 Christian Grothoff (and other contributing authors)
+
+     GNUnet 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 3, or (at your
+     option) any later version.
+
+     GNUnet is distributed in the hope that it will be useful, but
+     WITHOUT ANY WARRANTY; without even the implied warranty of
+     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+     General Public License for more details.
+
+     You should have received a copy of the GNU General Public License
+     along with GNUnet; see the file COPYING.  If not, write to the
+     Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+     Boston, MA 02111-1307, USA.
+*/
+
+#include "platform.h"
+#include <gnunet_util_lib.h>
+#include "gns_proxy_proto.h"
+
+#define GNUNET_GNS_PROXY_PORT 7777
+
+
+struct Socks5Request
+{
+  struct Socks5Request *prev;
+  struct Socks5Request *next;
+
+  struct GNUNET_NETWORK_Handle *sock;
+
+  int state;
+
+  GNUNET_SCHEDULER_TaskIdentifier rtask;
+};
+
+struct Socks5Connections
+{
+  struct Socks5Request *head;
+  struct Socks5Request *tail;
+};
+
+
+unsigned long port = GNUNET_GNS_PROXY_PORT;
+static struct GNUNET_NETWORK_Handle *lsock;
+GNUNET_SCHEDULER_TaskIdentifier ltask;
+static struct Socks5Connections s5conns;
+
+/**
+ * Read data from incoming connection
+ *
+ * @param cls the closure
+ * @param tc the scheduler context
+ */
+static void
+do_read (void* cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
+{
+  struct Socks5Request *s5r = cls;
+  char rbuf[512];
+  unsigned int len;
+
+  s5r->rtask = GNUNET_SCHEDULER_NO_TASK;
+
+  if ((NULL != tc->write_ready) &&
+      (GNUNET_NETWORK_fdset_isset (tc->read_ready, s5r->sock)) &&
+      (len = GNUNET_NETWORK_socket_recv (s5r->sock, &rbuf, sizeof (rbuf))))
+  {
+    GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+                "Successfully read %d bytes from socket\n",
+                len);
+  }
+  else
+  {
+    //ERROR!
+    GNUNET_NETWORK_socket_close (s5r->sock);
+    GNUNET_free(s5r);
+    return;
+  }
+
+  if (s5r->state == SOCKS5_INIT)
+  {
+    //DO sth etc
+  }
+
+  GNUNET_CONTAINER_DLL_remove (s5conns.head, s5conns.tail, s5r);
+
+}
+
+/**
+ * Accept new incoming connections
+ *
+ * @param cls the closure
+ * @param tc the scheduler context
+ */
+static void
+do_accept (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
+{
+  struct GNUNET_NETWORK_Handle *s;
+  struct Socks5Request *s5r;
+
+  ltask = GNUNET_SCHEDULER_NO_TASK;
+  if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN))
+    return;
+
+  ltask = GNUNET_SCHEDULER_add_read_net (GNUNET_TIME_UNIT_FOREVER_REL,
+                                         lsock,
+                                         &do_accept, NULL);
+
+  s = GNUNET_NETWORK_socket_accept (lsock, NULL, NULL);
+
+  if (NULL == s)
+  {
+    GNUNET_log_strerror (GNUNET_ERROR_TYPE_INFO, "accept");
+    return;
+  }
+
+  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+              "Got an inbound connection, waiting for data\n");
+
+  s5r = GNUNET_malloc (sizeof (struct Socks5Request));
+  s5r->sock = s;
+  s5r->state = SOCKS5_INIT;
+  s5r->rtask = GNUNET_SCHEDULER_add_read_net (GNUNET_TIME_UNIT_FOREVER_REL,
+                                              s5r->sock,
+                                              &do_read, s5r);
+  GNUNET_CONTAINER_DLL_insert (s5conns.head, s5conns.tail, s5r);
+}
+
+/**
+ * Main function that will be run
+ *
+ * @param cls closure
+ * @param args remaining command-line arguments
+ * @param cfgfile name of the configuration file used (for saving, can be NULL!)
+ * @param cfg configuration
+ */
+static void
+run (void *cls, char *const *args, const char *cfgfile,
+     const struct GNUNET_CONFIGURATION_Handle *cfg)
+{
+  struct sockaddr_in sa;
+
+  memset (&sa, 0, sizeof (sa));
+  sa.sin_family = AF_INET;
+  sa.sin_port = htons (port);
+#if HAVE_SOCKADDR_IN_SIN_LEN
+  sa.sin_len = sizeof (sa);
+#endif
+
+  lsock = GNUNET_NETWORK_socket_create (AF_INET,
+                                        SOCK_STREAM,
+                                        0);
+
+  if ((NULL == lsock) ||
+      (GNUNET_OK !=
+       GNUNET_NETWORK_socket_bind (lsock, (const struct sockaddr *) &sa,
+                                   sizeof (sa))))
+  {
+    GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
+                "Failed to create listen socket bound to `%s'",
+                GNUNET_a2s ((const struct sockaddr *) &sa, sizeof (sa)));
+    if (NULL != lsock)
+      GNUNET_NETWORK_socket_close (lsock);
+    return;
+  }
+
+  if (GNUNET_OK != GNUNET_NETWORK_socket_listen (lsock, 5))
+  {
+    GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
+                "Failed to listen on socket bound to `%s'",
+                GNUNET_a2s ((const struct sockaddr *) &sa, sizeof (sa)));
+    return;
+  }
+
+  ltask = GNUNET_SCHEDULER_add_read_net (GNUNET_TIME_UNIT_FOREVER_REL,
+                                         lsock, &do_accept, NULL);
+
+  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+              "Proxy listens on port %u\n",
+              port);
+
+}
+
+/**
+ * The main function for gnunet-gns-proxy.
+ *
+ * @param argc number of arguments from the command line
+ * @param argv command line arguments
+ * @return 0 ok, 1 on error
+ */
+int
+main (int argc, char *const *argv)
+{
+  static const struct GNUNET_GETOPT_CommandLineOption options[] = {
+    {'p', "port", NULL,
+     gettext_noop ("listen on specified port"), 1,
+     &GNUNET_GETOPT_set_string, &port},
+    GNUNET_GETOPT_OPTION_END
+  };
+
+  int ret;
+
+  GNUNET_log_setup ("gnunet-gns-proxy", "WARNING", NULL);
+  ret =
+      (GNUNET_OK ==
+       GNUNET_PROGRAM_run (argc, argv, "gnunet-gns-proxy",
+                           _("GNUnet GNS proxy"),
+                           options,
+                           &run, NULL)) ? 0 : 1;
+  return ret;
+}