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/*
* main.c - central part of the DNBD server application
* Copyright (C) 2006 Thorsten Zitterell <thorsten@zitterell.de>
*/
#include <stdio.h>
#include <string.h>
#include <getopt.h>
#include <unistd.h>
#include <stdlib.h>
/* network includes */
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <signal.h>
#define DNBD_USERSPACE 1
#include "../common/dnbd-cliserv.h"
#include "server.h"
#include "query.h"
#include "net.h"
#include "filer.h"
static int verbose = 0;
static int running = 1;
/*
* function: handle_signal(): set global variable running to 0 if signal arrives
*/
void handle_signal(int signum)
{
running = 0;
}
void server_help(void)
{
fprintf(stderr, "dnbd-server, version %s\n", DNBD_VERSION);
fprintf(stderr,
"Usage: dnbd-server -m <address> -d <device/file> -i <number>\n");
fprintf(stderr, "\n");
fprintf(stderr, "description:\n");
fprintf(stderr, " -m|--mcast <multicast-address>\n");
fprintf(stderr, " -d|--device <block device or file>\n");
fprintf(stderr, " -i|--id <unique identification number>\n");
fprintf(stderr, " -t|--threads <number of threads>\n");
}
/*
* function: server_init(): parse command lines
*/
server_info_t *server_init(int argc, char **argv)
{
/* cmd
* -1: error
* 0: not defined
* 1: serve
*/
int cmd = 0;
server_info_t *server_info = NULL;
server_info = (server_info_t *) malloc(sizeof(server_info_t));
if (!server_info)
return NULL;
memset(server_info, 0, sizeof(server_info_t));
server_info->threads = 1;
/* return value for getopt */
int c;
while (1) {
static struct option long_options[] = {
{"verbose", no_argument, 0, 'v'},
{"mcast", required_argument, 0, 'm'},
{"device", required_argument, 0, 'd'},
{"threads", required_argument, 0, 't'},
{"id", required_argument, 0, 'i'},
{0, 0, 0, 0}
};
/* option index for getopt_long */
int option_index = 0;
c = getopt_long(argc, argv, "vm:d:i:t:",
long_options, &option_index);
/* at end of options? */
if (c == -1)
break;
/*
cmd = (cmd ? -1 : xx) is used to set cmd when it was
unset (0) before. Otherwise save error value
*/
switch (c) {
case 'v':
verbose++;
break;
case 'm':
server_info->mnet = optarg; /* multicast address */
break;
case 'd':
cmd = (cmd ? -1 : 2); /* device/file */
server_info->filename = optarg;
break;
case 'i':
if (sscanf(optarg, "%u",&server_info->id) != 1) {
fprintf(stderr,"ERROR: Id not a 16bit-integer (>0)\n");
cmd = -1;
}
break;
case 't':
if (sscanf(optarg, "%u",&server_info->threads) != 1) {
fprintf(stderr,"ERROR: Number of threads is wrong (>0)\n");
cmd = -1;
}
break;
default:
cmd = -1;
}
if (cmd < 0) break;
}
/* no/wrong command given? */
if (cmd <= 0) {
server_help();
goto out_free;
}
if (!server_info->mnet) {
fprintf(stderr, "ERROR: multicast group was not set!\n");
goto out_free;
}
if (!(server_info->id > 0)) {
fprintf(stderr, "ERROR: unique id not set or not valid!\n");
goto out_free;
}
if (!(server_info->threads > 0)) {
fprintf(stderr, "ERROR: number of threads is not valid!\n");
goto out_free;
}
/* call function for command */
goto out;
out_free:
if (server_info)
free(server_info);
server_info = NULL;
out:
return server_info;
}
/*
* function: main(): server startup
*/
int main(int argc, char **argv)
{
server_info_t *server_info;
signal(SIGINT, handle_signal);
/* parse and verify command line options */
if (!(server_info = server_init(argc, argv))) {
fprintf(stderr, "ERROR: Parsing arguments!\n");
goto out_server;
}
/* initialize network configuration and start listener thread */
if (!(server_info->net_info = net_init(server_info->mnet))) {
fprintf(stderr, "ERROR: Initializing net!\n");
goto out_net;
}
if (!(server_info->filer_info = filer_init(server_info->filename))) {
fprintf(stderr, "ERROR: Initializing filer!\n");
goto out_filer;
}
/* initialize threads to handle requests */
if (!
(server_info->query_info =
query_init(server_info->net_info, server_info->filer_info,
server_info->id, server_info->threads))) {
fprintf(stderr, "ERROR: Initializing query!\n");
goto out_query;
}
while (running)
pause();
fprintf(stdout, "cleaning up...\n");
out_query:
if (server_info->filer_info)
free(server_info->filer_info);
out_filer:
if (server_info->net_info)
free(server_info->net_info);
out_net:
if (server_info) {
free(server_info);
}
out_server:
return 0;
}
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