/**
* Try to connect to a service configured to use a SOCKS5 proxy.
*
* @param service_name name of service to connect to
* @param cfg configuration to use
* @return Connection handle that becomes usable when the handshake completes.
* NULL if SOCKS not configured or not configured properly
*/
struct GNUNET_CONNECTION_Handle *
GNUNET_SOCKS_do_connect (const char *service_name,
const struct GNUNET_CONFIGURATION_Handle *cfg)
{
struct GNUNET_SOCKS_Handshake *ih;
struct GNUNET_CONNECTION_Handle *socks5; /* *proxied */
char *host0,*host1,*user,*pass;
unsigned long long port0,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 `%s'.\n"),
service_name,port1,host1);
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_non_null (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);
if (NULL != user) GNUNET_free (user);
if (NULL != pass) GNUNET_free (pass);
GNUNET_SOCKS_set_handshake_destination (ih,host1,port1);
GNUNET_free (host1);
return GNUNET_SOCKS_run_handshake(ih,socks5);
}
/**
* Try to connect to the service.
*
* @param service_name name of service to connect to
* @param cfg configuration to use
* @param attempt counter used to alternate between IP and UNIX domain sockets
* @return NULL on error
*/
static struct GNUNET_CONNECTION_Handle *
do_connect (const char *service_name,
const struct GNUNET_CONFIGURATION_Handle *cfg,
unsigned int attempt)
{
struct GNUNET_CONNECTION_Handle *connection;
char *hostname;
unsigned long long port;
/* Never use a local source if a proxy is configured */
if (GNUNET_YES == GNUNET_SOCKS_check_service (service_name,cfg))
return GNUNET_SOCKS_do_connect (service_name,cfg);
connection = NULL;
if (0 == (attempt % 2))
{
/* on even rounds, try UNIX first */
connection = try_unixpath (service_name, cfg);
if (NULL != connection)
return connection;
}
if (GNUNET_YES ==
GNUNET_CONFIGURATION_have_value (cfg, service_name, "PORT"))
{
if ((GNUNET_OK !=
GNUNET_CONFIGURATION_get_value_number (cfg, service_name, "PORT", &port))
|| (port > 65535) ||
(GNUNET_OK !=
GNUNET_CONFIGURATION_get_value_string (cfg, service_name, "HOSTNAME",
&hostname)))
{
LOG (GNUNET_ERROR_TYPE_WARNING,
_
("Could not determine valid hostname and port for service `%s' from configuration.\n"),
service_name);
return NULL;
}
if (0 == strlen (hostname))
{
GNUNET_free (hostname);
LOG (GNUNET_ERROR_TYPE_WARNING,
_("Need a non-empty hostname for service `%s'.\n"), service_name);
return NULL;
}
}
else
{
/* unspecified means 0 (disabled) */
port = 0;
hostname = NULL;
}
if (0 == port)
{
/* if port is 0, try UNIX */
connection = try_unixpath (service_name, cfg);
if (NULL != connection)
{
GNUNET_free_non_null (hostname);
return connection;
}
LOG (GNUNET_ERROR_TYPE_DEBUG,
"Port is 0 for service `%s', UNIXPATH did not work, returning NULL!\n",
service_name);
GNUNET_free_non_null (hostname);
return NULL;
}
connection = GNUNET_CONNECTION_create_from_connect (cfg, hostname, port);
GNUNET_free (hostname);
return connection;
}
