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/*
This file is part of GNUnet
(C) 2008--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.
*/
/**
* @file testbed/testbed_api_hosts.c
* @brief API for manipulating 'hosts' controlled by the GNUnet testing service;
* allows parsing hosts files, starting, stopping and communicating (via
* SSH/stdin/stdout) with the remote (or local) processes
* @author Christian Grothoff
*/
#include "platform.h"
#include "gnunet_testbed_service.h"
#include "gnunet_core_service.h"
#include "gnunet_constants.h"
#include "gnunet_transport_service.h"
#include "gnunet_hello_lib.h"
#include "gnunet_container_lib.h"
/**
* Opaque handle to a host running experiments managed by the testing framework.
* The master process must be able to SSH to this host without password (via
* ssh-agent).
*/
struct GNUNET_TESTBED_Host
{
/**
* The next pointer for DLL
*/
struct GNUNET_TESTBED_Host *next;
/**
* The prev pointer for DLL
*/
struct GNUNET_TESTBED_Host *prev;
/**
* The hostname of the host; NULL for localhost
*/
const char *hostname;
/**
* The username to be used for SSH login
*/
const char *username;
/**
* Global ID we use to refer to a host on the network
*/
uint32_t unique_id;
/**
* The port which is to be used for SSH
*/
uint16_t port;
};
/**
* Head element in the list of available hosts
*/
static struct GNUNET_TESTBED_Host *host_list_head;
/**
* Tail element in the list of available hosts
*/
static struct GNUNET_TESTBED_Host *host_list_tail;
/**
* Lookup a host by ID.
*
* @param id global host ID assigned to the host; 0 is
* reserved to always mean 'localhost'
* @return handle to the host, NULL if host not found
*/
struct GNUNET_TESTBED_Host *
GNUNET_TESTBED_host_lookup_by_id_ (uint32_t id)
{
struct GNUNET_TESTBED_Host *host;
for (host = host_list_head; NULL != host; host=host->next)
if (id == host->unique_id)
return host;
return NULL;
}
/**
* Create a host by ID; given this host handle, we could not
* run peers at the host, but we can talk about the host
* internally.
*
* @param id global host ID assigned to the host; 0 is
* reserved to always mean 'localhost'
* @return handle to the host, NULL on error
*/
struct GNUNET_TESTBED_Host *
GNUNET_TESTBED_host_create_by_id_ (uint32_t id)
{
GNUNET_break (0);
return NULL;
}
/**
* Obtain a host's unique global ID.
*
* @param host handle to the host, NULL means 'localhost'
* @return id global host ID assigned to the host (0 is
* 'localhost', but then obviously not globally unique)
*/
uint32_t
GNUNET_TESTBED_host_get_id_ (const struct GNUNET_TESTBED_Host *host)
{
return host->unique_id;
}
/**
* Create a host to run peers and controllers on.
*
* @param id global host ID assigned to the host; 0 is
* reserved to always mean 'localhost'
* @param hostname name of the host, use "NULL" for localhost
* @param username username to use for the login; may be NULL
* @param port port number to use for ssh; use 0 to let ssh decide
* @return handle to the host, NULL on error
*/
struct GNUNET_TESTBED_Host *
GNUNET_TESTBED_host_create_with_id_ (uint32_t id,
const char *hostname,
const char *username,
uint16_t port)
{
struct GNUNET_TESTBED_Host *host;
host = GNUNET_malloc (sizeof (struct GNUNET_TESTBED_Host));
host->hostname = hostname;
host->username = username;
host->unique_id = id;
host->port = (0 == port) ? 22 : port;
GNUNET_CONTAINER_DLL_insert_tail (host_list_head, host_list_tail, host);
return host;
}
/**
* Create a host to run peers and controllers on.
*
* @param hostname name of the host, use "NULL" for localhost
* @param username username to use for the login; may be NULL
* @param port port number to use for ssh; use 0 to let ssh decide
* @return handle to the host, NULL on error
*/
struct GNUNET_TESTBED_Host *
GNUNET_TESTBED_host_create (const char *hostname,
const char *username,
uint16_t port)
{
static uint32_t uid_generator;
if (NULL == hostname)
return GNUNET_TESTBED_host_create_with_id_ (0, hostname, username, port);
return GNUNET_TESTBED_host_create_with_id_ (++uid_generator,
hostname, username,
port);
}
/**
* Load a set of hosts from a configuration file.
*
* @param filename file with the host specification
* @param hosts set to the hosts found in the file
* @return number of hosts returned in 'hosts', 0 on error
*/
unsigned int
GNUNET_TESTBED_hosts_load_from_file (const char *filename,
struct GNUNET_TESTBED_Host **hosts)
{
GNUNET_break (0);
return 0;
}
/**
* Destroy a host handle. Must only be called once everything
* running on that host has been stopped.
*
* @param host handle to destroy
*/
void
GNUNET_TESTBED_host_destroy (struct GNUNET_TESTBED_Host *host)
{
GNUNET_CONTAINER_DLL_remove (host_list_head, host_list_tail, host);
GNUNET_free (host);
}
/**
* Run a given helper process at the given host. Communication
* with the helper will be via GNUnet messages on stdin/stdout.
* Runs the process via 'ssh' at the specified host, or locally.
* Essentially an SSH-wrapper around the 'gnunet_helper_lib.h' API.
*
* @param host host to use, use "NULL" for localhost
* @param binary_argv binary name and command-line arguments to give to the binary
* @param cb function to call for messages received from the binary
* @param cb_cls closure for cb
* @return handle to terminate the command, NULL on error
*/
struct GNUNET_HELPER_Handle *
GNUNET_TESTBED_host_run_ (struct GNUNET_TESTBED_Host *host,
char *const binary_argv[],
GNUNET_SERVER_MessageTokenizerCallback cb, void *cb_cls)
{
/* FIXME: decide on the SSH command line, prepend it and
run GNUNET_HELPER_start with the modified binary_name and binary_argv! */
GNUNET_break (0);
return NULL;
}
/* end of testbed_api_hosts.c */
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