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/**
* gammad -- Cooperative gamma server
* Copyright (C) 2016 Mattias Andrée (maandree@kth.se)
*
* This library 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 of the License, or
* (at your option) any later version.
*
* This library 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 this library. If not, see <http://www.gnu.org/licenses/>.
*/
#include "server.h"
#include "util.h"
#include <sys/socket.h>
#include <stdlib.h>
#include <string.h>
/**
* List of all client's file descriptors
*
* Unused slots, with index less than `connections_used`,
* should have the value -1 (negative)
*/
int* connections = NULL;
/**
* The number of elements allocated for `connections`
*/
size_t connections_alloc = 0;
/**
* The index of the first unused slot in `connections`
*/
size_t connections_ptr = 0;
/**
* The index of the last used slot in `connections`, plus 1
*/
size_t connections_used = 0;
/**
* The server connection's message buffer
*/
struct message server_message;
/**
* The clients' connections' message buffers
*/
struct message* client_messages = NULL;
/**
* The server socket's file descriptor
*/
extern int socketfd;
/**
* Initialise the state of the connections
*
* @param Zero on success, -1 on error
*/
int server_initialise(void)
{
return message_initialise(&server_message);
}
/**
* Destroy the state of the connections
*
* @param disconnect Disconnect all connections?
*/
void server_destroy(int disconnect)
{
size_t i;
/* TODO */ (void) disconnect;
for (i = 0; i < connections_used; i++)
if (connections[i] >= 0)
message_destroy(client_messages + i);
free(client_messages);
message_destroy(&server_message);
free(connections);
}
/**
* Marshal the state of the connections
*
* @param buf Output buffer for the marshalled data,
* `NULL` to only measure how many bytes
* this buffer needs
* @return The number of marshalled bytes
*/
size_t server_marshal(void* buf)
{
size_t i, off = 0;
char* bs = buf;
if (bs != NULL)
*(size_t*)(bs + off) = connections_ptr;
off += sizeof(size_t);
if (bs != NULL)
*(size_t*)(bs + off) = connections_used;
off += sizeof(size_t);
if (bs != NULL)
memcpy(bs + off, connections, connections_used * sizeof(*connections));
off += connections_used * sizeof(*connections);
off += message_marshal(&server_message, bs ? bs + off : NULL);
for (i = 0; i < connections_used; i++)
if (connections[i] >= 0)
off += message_marshal(client_messages + i, bs ? bs + off : NULL);
return off;
}
/**
* Unmarshal the state of the connections
*
* @param buf Buffer for the marshalled data
* @return The number of unmarshalled bytes, 0 on error
*/
size_t server_unmarshal(const void* buf)
{
size_t off = 0, i, n;
const char* bs = buf;
connections = NULL;
client_messages = NULL;
memset(&server_message, 0, sizeof(server_message));
connections_ptr = *(const size_t*)(bs + off);
off += sizeof(size_t);
connections_alloc = connections_used = *(const size_t*)(bs + off);
off += sizeof(size_t);
if (connections_alloc > 0)
{
connections = memdup(bs + off, connections_alloc * sizeof(*connections));
if (connections == NULL)
return 0;
off += connections_used * sizeof(*connections);
client_messages = malloc(connections_alloc * sizeof(*client_messages));
if (client_messages == NULL)
return 0;
}
off += n = message_unmarshal(&server_message, bs + off);
if (n == 0)
return 0;
for (i = 0; i < connections_used; i++)
if (connections[i] >= 0)
{
off += n = message_unmarshal(client_messages + i, bs ? bs + off : NULL);
if (n == 0)
return 0;
}
return off;
}
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