/*
* This file is part of the Distributed Network Block Device 3
*
* Copyright(c) 2011-2012 Johann Latocha <johann@latocha.de>
*
* This file may be licensed under the terms of of the
* GNU General Public License Version 2 (the ``GPL'').
*
* Software distributed under the License is distributed
* on an ``AS IS'' basis, WITHOUT WARRANTY OF ANY KIND, either
* express or implied. See the GPL for the specific language
* governing rights and limitations.
*
* You should have received a copy of the GPL along with this
* program. If not, go to http://www.gnu.org/licenses/gpl.html
* or write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
*/
#include <stdio.h>
#include <stdlib.h>
#include <signal.h>
#include <getopt.h>
#include <pthread.h>
#include <string.h>
#include <fcntl.h>
#include <sys/ioctl.h>
#include <stdint.h>
#include <unistd.h>
#include "../types.h"
#include "../version.h"
#include "sockhelper.h"
#include "server.h"
#include "image.h"
#include "uplink.h"
#include "net.h"
#include "memlog.h"
#define MAX_SERVER_SOCKETS 50 // Assume there will be no more than 50 sockets the server will listen on
static int sockets[MAX_SERVER_SOCKETS], socket_count = 0;
#ifdef _DEBUG
int _fake_delay = 0;
#endif
dnbd3_client_t *_clients[SERVER_MAX_CLIENTS];
int _num_clients = 0;
pthread_spinlock_t _clients_lock;
char *_config_file_name = DEFAULT_SERVER_CONFIG_FILE;
char *_rpc_password = NULL;
char *_cache_dir = NULL;
static int dnbd3_add_client(dnbd3_client_t *client);
static void dnbd3_load_config();
static void dnbd3_handle_sigpipe(int signum);
static void dnbd3_handle_sigterm(int signum);
/**
* Print help text for usage instructions
*/
void dnbd3_print_help(char *argv_0)
{
printf( "Usage: %s [OPTIONS]...\n", argv_0 );
printf( "Start the DNBD3 server\n" );
printf( "-f or --file Configuration file (default /etc/dnbd3-server.conf)\n" );
#ifdef _DEBUG
printf("-d or --delay Add a fake network delay of X µs\n");
#endif
printf( "-n or --nodaemon Start server in foreground\n" );
printf( "-r or --reload Reload configuration file\n" );
printf( "-s or --stop Stop running dnbd3-server\n" );
printf( "-i or --info Print connected clients and used images\n" );
printf( "-H or --help Show this help text and quit\n" );
printf( "-V or --version Show version and quit\n" );
exit( 0 );
}
/**
* Print version information
*/
void dnbd3_print_version()
{
printf( "Version: %s\n", VERSION_STRING );
exit( 0 );
}
/**
* Clean up structs, connections, write out data, then exit
*/
void dnbd3_cleanup()
{
int i;
memlogf( "INFO: Cleanup...\n" );
for (int i = 0; i < socket_count; ++i) {
if ( sockets[i] == -1 ) continue;
close( sockets[i] );
sockets[i] = -1;
}
socket_count = 0;
// Clean up clients
pthread_spin_lock( &_clients_lock );
for (i = 0; i < _num_clients; ++i) {
dnbd3_client_t * const client = _clients[i];
pthread_spin_lock( &client->lock );
if ( client->sock >= 0 ) shutdown( client->sock, SHUT_RDWR );
if ( client->thread != 0 ) pthread_join( client->thread, NULL );
_clients[i] = NULL;
pthread_spin_unlock( &client->lock );
free( client );
}
_num_clients = 0;
pthread_spin_unlock( &_clients_lock );
// Clean up images
pthread_spin_lock( &_images_lock );
for (i = 0; i < _num_images; ++i) {
dnbd3_image_t *image = _images[i];
pthread_spin_lock( &image->lock );
// save cache maps to files
image_save_cache_map( image );
// free uplink connection
uplink_shutdown( image->uplink );
// free other stuff
free( image->cache_map );
free( image->path );
free( image->lower_name );
_images[i] = NULL;
pthread_spin_unlock( &image->lock );
free( image );
}
_num_images = 0;
pthread_spin_unlock( &_images_lock );
exit( EXIT_SUCCESS );
}
/**
* Program entry point
*/
int main(int argc, char *argv[])
{
int demonize = 1;
int opt = 0;
int longIndex = 0;
static const char *optString = "f:d:nrsiHV?";
static const struct option longOpts[] = { { "file", required_argument, NULL, 'f' }, { "delay", required_argument, NULL, 'd' }, {
"nodaemon", no_argument, NULL, 'n' }, { "reload", no_argument, NULL, 'r' }, { "stop", no_argument, NULL, 's' }, { "info",
no_argument, NULL, 'i' }, { "help", no_argument, NULL, 'H' }, { "version", no_argument, NULL, 'V' } };
opt = getopt_long( argc, argv, optString, longOpts, &longIndex );
while ( opt != -1 ) {
switch ( opt ) {
case 'f':
_config_file_name = strdup( optarg );
break;
case 'd':
#ifdef _DEBUG
_fake_delay = atoi(optarg);
break;
#else
printf( "This option is only available in debug builds.\n\n" );
return EXIT_FAILURE;
#endif
case 'n':
demonize = 0;
break;
case 'r':
printf( "INFO: Reloading configuration file...\n\n" );
//dnbd3_rpc_send(RPC_RELOAD);
return EXIT_SUCCESS;
case 's':
printf( "INFO: Stopping running server...\n\n" );
//dnbd3_rpc_send(RPC_EXIT);
return EXIT_SUCCESS;
case 'i':
printf( "INFO: Requesting information...\n\n" );
//dnbd3_rpc_send(RPC_IMG_LIST);
return EXIT_SUCCESS;
case 'H':
dnbd3_print_help( argv[0] );
break;
case 'V':
dnbd3_print_version();
break;
case '?':
dnbd3_print_help( argv[0] );
break;
}
opt = getopt_long( argc, argv, optString, longOpts, &longIndex );
}
if ( demonize ) daemon( 1, 0 );
_basePath = strdup("/home/sr/vmware/");
_vmdkLegacyMode = TRUE;
pthread_spin_init( &_clients_lock, PTHREAD_PROCESS_PRIVATE );
pthread_spin_init( &_images_lock, PTHREAD_PROCESS_PRIVATE );
pthread_spin_init( &_alts_lock, PTHREAD_PROCESS_PRIVATE );
initmemlog();
memlogf( "DNBD3 server starting.... Machine type: " ENDIAN_MODE );
// load config file
dnbd3_load_config();
// setup signal handler
signal( SIGPIPE, dnbd3_handle_sigpipe );
signal( SIGTERM, dnbd3_handle_sigterm );
signal( SIGINT, dnbd3_handle_sigterm );
// Load all images in base path
if (!image_load_all(NULL)) {
printf("[ERROR] Could not load images.\n");
return EXIT_FAILURE;
}
// setup network
sockets[socket_count] = sock_listen_any( PF_INET, PORT );
if ( sockets[socket_count] != -1 ) ++socket_count;
#ifdef WITH_IPV6
sockets[socket_count] = sock_listen_any(PF_INET6, PORT);
if (sockets[socket_count] != -1)
++socket_count;
#endif
if ( socket_count == 0 ) exit( EXIT_FAILURE );
struct sockaddr_storage client;
socklen_t len;
int fd;
// setup rpc
//pthread_t thread_rpc;
//pthread_create(&(thread_rpc), NULL, &dnbd3_rpc_mainloop, NULL);
// setup the job thread (query other servers, delete old images etc.)
//pthread_t thread_job;
//pthread_create(&(thread_job), NULL, &dnbd3_job_thread, NULL);
memlogf( "[INFO] Server is ready..." );
// main loop
while ( 1 ) {
len = sizeof(client);
fd = accept_any( sockets, socket_count, &client, &len );
if ( fd < 0 ) {
memlogf( "[ERROR] Client accept failure" );
usleep( 10000 ); // 10ms
continue;
}
//memlogf("INFO: Client %s connected\n", inet_ntoa(client.sin_addr));
sock_set_timeout( fd, SOCKET_TIMEOUT_SERVER_MS );
dnbd3_client_t *dnbd3_client = dnbd3_init_client( &client, fd );
if ( dnbd3_client == NULL ) {
close( fd );
continue;
}
// This has to be done before creating the thread, otherwise a race condition might occur when the new thread dies faster than this thread adds the client to the list after creating the thread
if ( !dnbd3_add_client( dnbd3_client ) ) {
dnbd3_client = dnbd3_free_client( dnbd3_client );
continue;
}
if ( 0 != pthread_create( &(dnbd3_client->thread), NULL, net_client_handler, (void *)(uintptr_t)dnbd3_client ) ) {
memlogf( "[ERROR] Could not start thread for new client." );
dnbd3_remove_client( dnbd3_client );
dnbd3_client = dnbd3_free_client( dnbd3_client );
continue;
}
pthread_detach( dnbd3_client->thread );
}
dnbd3_cleanup();
}
/**
* Initialize and populate the client struct - called when an incoming
* connection is accepted
*/
dnbd3_client_t* dnbd3_init_client(struct sockaddr_storage *client, int fd)
{
dnbd3_client_t *dnbd3_client = calloc( 1, sizeof(dnbd3_client_t) );
if ( dnbd3_client == NULL ) {
memlogf( "[ERROR] Could not alloc dnbd3_client_t for new client." );
return NULL ;
}
if ( client->ss_family == AF_INET ) {
struct sockaddr_in *v4 = (struct sockaddr_in *)client;
dnbd3_client->host.type = AF_INET;
memcpy( dnbd3_client->host.addr, &(v4->sin_addr), 4 );
dnbd3_client->host.port = v4->sin_port;
} else if ( client->ss_family == AF_INET6 ) {
struct sockaddr_in6 *v6 = (struct sockaddr_in6 *)client;
dnbd3_client->host.type = AF_INET6;
memcpy( dnbd3_client->host.addr, &(v6->sin6_addr), 16 );
dnbd3_client->host.port = v6->sin6_port;
} else {
memlogf( "[ERROR] New client has unknown address family %d, disconnecting...", (int)client->ss_family );
free( dnbd3_client );
return NULL ;
}
dnbd3_client->sock = fd;
pthread_spin_init( &dnbd3_client->lock, PTHREAD_PROCESS_PRIVATE );
return dnbd3_client;
}
/**
* Remove a client from the clients array
* Locks on: _clients_lock
*/
void dnbd3_remove_client(dnbd3_client_t *client)
{
int i;
pthread_spin_lock( &_clients_lock );
for (i = _num_clients - 1; i >= 0; --i) {
if ( _clients[i] != client ) continue;
_clients[i] = NULL;
if ( i + 1 == _num_clients ) --_num_clients;
}
pthread_spin_unlock( &_clients_lock );
}
/**
* Free the client struct recursively.
* !! Make sure to call this function after removing the client from _dnbd3_clients !!
* Locks on: _clients[].lock
*/
dnbd3_client_t* dnbd3_free_client(dnbd3_client_t *client)
{
GSList *it;
pthread_spin_lock(&client->lock);
for (it = client->sendqueue; it; it = it->next) {
free( it->data );
}
g_slist_free( client->sendqueue );
if ( client->sock >= 0 ) close( client->sock );
client->sock = -1;
if ( client->image != NULL ) image_release( client->image );
client->image = NULL;
pthread_spin_unlock(&client->lock);
pthread_spin_destroy(&client->lock);
free( client );
return NULL;
}
//###//
/**
* Add client to the clients array.
* Locks on: _clients_lock
*/
static int dnbd3_add_client(dnbd3_client_t *client)
{
int i;
pthread_spin_lock( &_clients_lock );
for (i = 0; i < _num_clients; ++i) {
if ( _clients[i] != NULL ) continue;
_clients[i] = client;
pthread_spin_unlock( &_clients_lock );
return TRUE;
}
if ( _num_clients >= SERVER_MAX_CLIENTS ) {
pthread_spin_unlock( &_clients_lock );
memlogf( "[ERROR] Maximum number of clients reached!" );
return FALSE;
}
_clients[_num_clients++] = client;
pthread_spin_unlock( &_clients_lock );
return TRUE;
}
static void dnbd3_load_config()
{
// Load configuration
}
static void dnbd3_handle_sigpipe(int signum)
{
memlogf( "INFO: SIGPIPE received (%s)", strsignal( signum ) );
}
static void dnbd3_handle_sigterm(int signum)
{
memlogf( "INFO: SIGTERM or SIGINT received (%s)", strsignal( signum ) );
dnbd3_cleanup();
}
