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-rw-r--r--src/net_sdl.c287
1 files changed, 287 insertions, 0 deletions
diff --git a/src/net_sdl.c b/src/net_sdl.c
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+// Emacs style mode select -*- C++ -*-
+//-----------------------------------------------------------------------------
+//
+// $Id: net_sdl.c 229 2005-10-30 19:56:15Z fraggle $
+//
+// Copyright(C) 2005 Simon Howard
+//
+// This program 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 2
+// of the License, or (at your option) any later version.
+//
+// This program 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 program; if not, write to the Free Software
+// Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
+// 02111-1307, USA.
+//
+// $Log$
+// Revision 1.1 2005/10/30 19:56:15 fraggle
+// Add foundation code for the new networking system
+//
+//
+// DESCRIPTION:
+// Networking module which uses SDL_net
+//
+//-----------------------------------------------------------------------------
+
+#include <stdlib.h>
+#include <string.h>
+#include <stdio.h>
+
+#include "i_net.h"
+#include "i_system.h"
+#include "m_argv.h"
+#include "net_defs.h"
+#include "net_packet.h"
+#include "net_sdl.h"
+#include "z_zone.h"
+
+//
+// NETWORKING
+//
+
+#include <SDL_net.h>
+
+static int port = 2342;
+static UDPsocket udpsocket;
+static UDPpacket *recvpacket;
+
+typedef struct
+{
+ net_addr_t net_addr;
+ IPaddress sdl_addr;
+} addrpair_t;
+
+static addrpair_t **addr_table;
+static int addr_table_size;
+
+// Initialises the address table
+
+static void NET_SDL_InitAddrTable(void)
+{
+ addr_table_size = 16;
+
+ addr_table = Z_Malloc(sizeof(addrpair_t *) * addr_table_size,
+ PU_STATIC, 0);
+ memset(addr_table, 0, sizeof(addrpair_t *) * addr_table_size);
+}
+
+static boolean AddressesEqual(IPaddress *a, IPaddress *b)
+{
+ return a->host == b->host
+ && a->port == b->port;
+}
+
+// Finds an address by searching the table. If the address is not found,
+// it is added to the table.
+
+static net_addr_t *NET_SDL_FindAddress(IPaddress *addr)
+{
+ addrpair_t *new_entry;
+ int empty_entry = -1;
+ int i;
+
+ for (i=0; i<addr_table_size; ++i)
+ {
+ if (addr_table[i] != NULL
+ && AddressesEqual(addr, &addr_table[i]->sdl_addr))
+ {
+ return &addr_table[i]->net_addr;
+ }
+
+ if (empty_entry < 0 && addr_table[i] == NULL)
+ empty_entry = i;
+ }
+
+ // Was not found in list. We need to add it.
+
+ // Is there any space in the table? If not, increase the table size
+
+ if (empty_entry < 0)
+ {
+ addrpair_t **new_addr_table;
+ int new_addr_table_size;
+
+ // after reallocing, we will add this in as the first entry
+ // in the new block of memory
+
+ empty_entry = addr_table_size;
+
+ // allocate a new array twice the size, init to 0 and copy
+ // the existing table in. replace the old table.
+
+ new_addr_table_size = addr_table_size * 2;
+ new_addr_table = Z_Malloc(sizeof(addrpair_t *) * new_addr_table_size,
+ PU_STATIC, 0);
+ memset(new_addr_table, 0, sizeof(addrpair_t *) * new_addr_table_size);
+ memcpy(new_addr_table, addr_table,
+ sizeof(addrpair_t *) * addr_table_size);
+ Z_Free(addr_table);
+ addr_table = new_addr_table;
+ addr_table_size = new_addr_table_size;
+ }
+
+ // Add a new entry
+
+ new_entry = Z_Malloc(sizeof(addrpair_t), PU_STATIC, 0);
+
+ new_entry->sdl_addr = *addr;
+ new_entry->net_addr.handle = &new_entry->sdl_addr;
+ new_entry->net_addr.module = &i_net_module;
+
+ addr_table[empty_entry] = new_entry;
+
+ return &new_entry->net_addr;
+}
+
+static void NET_SDL_FreeAddress(net_addr_t *addr)
+{
+ int i;
+
+ for (i=0; i<addr_table_size; ++i)
+ {
+ if (addr == &addr_table[i]->net_addr)
+ {
+ Z_Free(addr_table[i]);
+ addr_table[i] = NULL;
+ return;
+ }
+ }
+
+ I_Error("NET_SDL_FreeAddress: Attempted to remove an unused address!");
+}
+
+static boolean NET_SDL_InitClient(void)
+{
+ SDLNet_Init();
+
+ udpsocket = SDLNet_UDP_Open(0);
+
+ if (udpsocket == NULL)
+ {
+ I_Error("NET_SDL_InitClient: Unable to open a socket!");
+ }
+
+ NET_SDL_InitAddrTable();
+ recvpacket = SDLNet_AllocPacket(1500);
+
+ return true;
+}
+
+static boolean NET_SDL_InitServer(void)
+{
+ int p;
+
+ p = M_CheckParm("-port");
+ if (p > 0)
+ port = atoi(myargv[p+1]);
+
+ SDLNet_Init();
+
+ udpsocket = SDLNet_UDP_Open(port);
+
+ if (udpsocket == NULL)
+ {
+ I_Error("NET_SDL_InitServer: Unable to bind to port %i", port);
+ }
+
+ NET_SDL_InitAddrTable();
+ recvpacket = SDLNet_AllocPacket(1500);
+
+ return true;
+}
+
+static void NET_SDL_SendPacket(net_addr_t *addr, net_packet_t *packet)
+{
+ UDPpacket sdl_packet;
+ IPaddress *ip = (IPaddress *) addr->handle;
+
+ sdl_packet.channel = 0;
+ sdl_packet.data = packet->data;
+ sdl_packet.len = packet->len;
+ sdl_packet.address = *ip;
+
+ if (!SDLNet_UDP_Send(udpsocket, -1, &sdl_packet))
+ {
+ I_Error("NET_SDL_SendPacket: Error transmitting packet: %s",
+ SDLNet_GetError());
+ }
+}
+
+static boolean NET_SDL_RecvPacket(net_addr_t **addr, net_packet_t **packet)
+{
+ int result;
+
+ result = SDLNet_UDP_Recv(udpsocket, recvpacket);
+
+ if (result < 0)
+ {
+ I_Error("NET_SDL_RecvPacket: Error receiving packet: %s",
+ SDLNet_GetError());
+ }
+
+ // no packets received
+
+ if (result == 0)
+ return false;
+
+ // Put the data into a new packet structure
+
+ *packet = NET_NewPacket(recvpacket->len);
+ memcpy((*packet)->data, recvpacket->data, recvpacket->len);
+ (*packet)->len = recvpacket->len;
+
+ // Address
+
+ *addr = NET_SDL_FindAddress(&recvpacket->address);
+
+ return true;
+}
+
+void NET_SDL_AddrToString(net_addr_t *addr, char *buffer, int buffer_len)
+{
+ IPaddress *ip;
+
+ ip = (IPaddress *) addr->handle;
+
+ snprintf(buffer, buffer_len,
+ "%i.%i.%i.%i",
+ (ip->host >> 24) & 0xff,
+ (ip->host >> 16) & 0xff,
+ (ip->host >> 8) & 0xff,
+ ip->host & 0xff);
+}
+
+net_addr_t *NET_SDL_ResolveAddress(char *address)
+{
+ IPaddress ip;
+
+ if (SDLNet_ResolveHost(&ip, address, port))
+ {
+ // unable to resolve
+
+ return NULL;
+ }
+
+ return NET_SDL_FindAddress(&ip);
+}
+
+// Complete module
+
+net_module_t i_net_module =
+{
+ NET_SDL_InitClient,
+ NET_SDL_InitServer,
+ NET_SDL_SendPacket,
+ NET_SDL_RecvPacket,
+ NET_SDL_AddrToString,
+ NET_SDL_FreeAddress,
+ NET_SDL_ResolveAddress,
+};
+
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