SOCKS proxy

SOCKS proxy for connections. More...

Collaboration diagram for SOCKS proxy:

Functions
int	GNUNET_SOCKS_check_service (const char *service_name, const struct GNUNET_CONFIGURATION_Handle *cfg)
	Check if a SOCKS proxy is required by a service. More...
struct GNUNET_CONNECTION_Handle *	GNUNET_SOCKS_do_connect (const char *service_name, const struct GNUNET_CONFIGURATION_Handle *cfg)
	Try to connect to a service configured to use a SOCKS5 proxy. More...

Detailed Description

SOCKS proxy for connections.

Function Documentation

GNUNET_SOCKS_check_service()

int GNUNET_SOCKS_check_service	(	const char *	service_name,
		const struct GNUNET_CONFIGURATION_Handle *	cfg
	)

Check if a SOCKS proxy is required by a service.

Do not use local service if a SOCKS proxy port is configured as this could deanonymize a user.

Parameters

service_name	name of service to connect to
cfg	configuration to use

Returns

GNUNET_YES if so, GNUNET_NO if not

Definition at line 594 of file socks.c.

{
  return GNUNET_CONFIGURATION_have_value (cfg, service_name, "SOCKSPORT") ||
         GNUNET_CONFIGURATION_have_value (cfg, service_name, "SOCKSHOST");
}

References cfg, GNUNET_CONFIGURATION_have_value(), and service_name.

Referenced by GNUNET_SOCKS_do_connect(), and start_connect().

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GNUNET_SOCKS_do_connect()

struct GNUNET_CONNECTION_Handle * GNUNET_SOCKS_do_connect	(	const char *	service_name,
		const struct GNUNET_CONFIGURATION_Handle *	cfg
	)

Try to connect to a service configured to use a SOCKS5 proxy.

Parameters

service_name	name of service to connect to
cfg	configuration to use

Returns

Connection handle that becomes usable when the handshake completes. NULL if SOCKS not configured or not configured properly

Definition at line 611 of file socks.c.

{
  struct GNUNET_SOCKS_Handshake *ih;
  struct GNUNET_CONNECTION_Handle *socks5; /* *proxied */
  char *host0;
  char *host1;
  char *user;
  char *pass;
  unsigned long long port0;
  unsigned long long port1;
 
  if (GNUNET_YES != GNUNET_SOCKS_check_service (service_name, cfg))
    return NULL;
  if (GNUNET_OK != GNUNET_CONFIGURATION_get_value_number (cfg,
                                                          service_name,
                                                          "SOCKSPORT",
                                                          &port0))
    port0 = 9050;
  /* A typical Tor client should usually try port 9150 for the TBB too, but
   * GNUnet can probably assume a system Tor installation. */
  if ((port0 > 65535) || (port0 <= 0))
  {
    LOG (GNUNET_ERROR_TYPE_WARNING,
         _ (
           "Attempting to use invalid port %d as SOCKS proxy for service `%s'.\n"),
         port0,
         service_name);
    return NULL;
  }
  if ((GNUNET_OK != GNUNET_CONFIGURATION_get_value_number (cfg,
                                                           service_name,
                                                           "PORT",
                                                           &port1)) ||
      (port1 > 65535) || (port1 <= 0) ||
      (GNUNET_OK != GNUNET_CONFIGURATION_get_value_string (cfg,
                                                           service_name,
                                                           "HOSTNAME",
                                                           &host1)))
  {
    LOG (GNUNET_ERROR_TYPE_WARNING,
         _ (
           "Attempting to proxy service `%s' to invalid port %d or hostname.\n"),
         service_name,
         port1);
    return NULL;
  }
  /* Appeared to still work after host0 corrupted, so either test case is broken, or
     this whole routine is not being called. */
  if (GNUNET_OK != GNUNET_CONFIGURATION_get_value_string (cfg,
                                                          service_name,
                                                          "SOCKSHOST",
                                                          &host0))
    host0 = NULL;
  socks5 = GNUNET_CONNECTION_create_from_connect (cfg,
                                                  (host0 != NULL) ? host0
                                                  : "127.0.0.1",
                                                  port0);
  GNUNET_free (host0);
 
  /* Sets to NULL if they do not exist */
  (void) GNUNET_CONFIGURATION_get_value_string (cfg,
                                                service_name,
                                                "SOCKSUSER",
                                                &user);
  (void) GNUNET_CONFIGURATION_get_value_string (cfg,
                                                service_name,
                                                "SOCKSPASS",
                                                &pass);
  ih = GNUNET_SOCKS_init_handshake (user, pass);
  GNUNET_free (user);
  GNUNET_free (pass);
 
  GNUNET_SOCKS_set_handshake_destination (ih, host1, port1);
  GNUNET_free (host1);
  return GNUNET_SOCKS_run_handshake (ih, socks5);
}

References _, cfg, GNUNET_CONFIGURATION_get_value_number(), GNUNET_CONFIGURATION_get_value_string(), GNUNET_ERROR_TYPE_WARNING, GNUNET_free, GNUNET_OK, GNUNET_SOCKS_check_service(), GNUNET_SOCKS_init_handshake(), GNUNET_SOCKS_run_handshake(), GNUNET_SOCKS_set_handshake_destination(), GNUNET_YES, LOG, and service_name.

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