1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
|
/*
* The Mana World
* Copyright 2004 The Mana World Development Team
*
* This file is part of The Mana World.
*
* The Mana World 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
* any later version.
*
* The Mana World 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 The Mana World; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
* $Id$
*/
#include "network.h"
#include <cassert>
#include <sstream>
#include <SDL_net.h>
#include "messagein.h"
#include "../log.h"
#include "../main.h"
/** Warning: buffers and other variables are shared,
so there can be only one connection active at a time */
short packet_lengths[] = {
10, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
// #0x0040
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 55, 17, 3, 37, 46, -1, 23, -1, 3,108, 3, 2,
3, 28, 19, 11, 3, -1, 9, 5, 54, 53, 58, 60, 41, 2, 6, 6,
// #0x0080
7, 3, 2, 2, 2, 5, 16, 12, 10, 7, 29, 23, -1, -1, -1, 0,
7, 22, 28, 2, 6, 30, -1, -1, 3, -1, -1, 5, 9, 17, 17, 6,
23, 6, 6, -1, -1, -1, -1, 8, 7, 6, 7, 4, 7, 0, -1, 6,
8, 8, 3, 3, -1, 6, 6, -1, 7, 6, 2, 5, 6, 44, 5, 3,
// #0x00C0
7, 2, 6, 8, 6, 7, -1, -1, -1, -1, 3, 3, 6, 6, 2, 27,
3, 4, 4, 2, -1, -1, 3, -1, 6, 14, 3, -1, 28, 29, -1, -1,
30, 30, 26, 2, 6, 26, 3, 3, 8, 19, 5, 2, 3, 2, 2, 2,
3, 2, 6, 8, 21, 8, 8, 2, 2, 26, 3, -1, 6, 27, 30, 10,
// #0x0100
2, 6, 6, 30, 79, 31, 10, 10, -1, -1, 4, 6, 6, 2, 11, -1,
10, 39, 4, 10, 31, 35, 10, 18, 2, 13, 15, 20, 68, 2, 3, 16,
6, 14, -1, -1, 21, 8, 8, 8, 8, 8, 2, 2, 3, 4, 2, -1,
6, 86, 6, -1, -1, 7, -1, 6, 3, 16, 4, 4, 4, 6, 24, 26,
// #0x0140
22, 14, 6, 10, 23, 19, 6, 39, 8, 9, 6, 27, -1, 2, 6, 6,
110, 6, -1, -1, -1, -1, -1, 6, -1, 54, 66, 54, 90, 42, 6, 42,
-1, -1, -1, -1, -1, 30, -1, 3, 14, 3, 30, 10, 43, 14,186,182,
14, 30, 10, 3, -1, 6,106, -1, 4, 5, 4, -1, 6, 7, -1, -1,
// #0x0180
6, 3,106, 10, 10, 34, 0, 6, 8, 4, 4, 4, 29, -1, 10, 6,
90, 86, 24, 6, 30,102, 9, 4, 8, 4, 14, 10, 4, 6, 2, 6,
3, 3, 35, 5, 11, 26, -1, 4, 4, 6, 10, 12, 6, -1, 4, 4,
11, 7, -1, 67, 12, 18,114, 6, 3, 6, 26, 26, 26, 26, 2, 3,
// #0x01C0
2, 14, 10, -1, 22, 22, 4, 2, 13, 97, 0, 9, 9, 29, 6, 28,
8, 14, 10, 35, 6, 8, 4, 11, 54, 53, 60, 2, -1, 47, 33, 6,
30, 8, 34, 14, 2, 6, 26, 2, 28, 81, 6, 10, 26, 2, -1, -1,
-1, -1, 20, 10, 32, 9, 34, 14, 2, 6, 48, 56, -1, 4, 5, 10,
// #0x200
26, 0, 0, 0, 18, 0, 0, 0, 0, 0, 0, 19, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
};
unsigned int buffer_size = 65536;
char *in = NULL;
char *out = NULL;
unsigned int in_size = 0;
unsigned int out_size = 0;
bool connectionOpen = false;
TCPsocket sock;
SDLNet_SocketSet set;
char *iptostring(int address)
{
static char asciiIP[16];
sprintf(asciiIP, "%i.%i.%i.%i",
(unsigned char)(address),
(unsigned char)(address >> 8),
(unsigned char)(address >> 16),
(unsigned char)(address >> 24));
return asciiIP;
}
int open_session(const char* address, short port)
{
assert(!connectionOpen);
// Initialize SDL_net
if (SDLNet_Init() == -1)
{
logger->log("Error in SDLNet_Init(): %s", SDLNet_GetError());
return -1;
}
IPaddress ip;
// Resolve host name
if (SDLNet_ResolveHost(&ip, address, port) == -1)
{
logger->log("Error in SDLNet_ResolveHost(): %s", SDLNet_GetError());
return -1;
}
// Create the socket for the current session
sock = SDLNet_TCP_Open(&ip);
if (!sock)
{
logger->log("Error in SDLNet_TCP_Open(): %s", SDLNet_GetError());
return -1;
}
// Create a socket set to listen to socket
set = SDLNet_AllocSocketSet(1);
if (!set)
{
logger->log("Error in SDLNet_AllocSocketSet(): %s", SDLNet_GetError());
return -1;
}
// Add the socket to the set
int ret = SDLNet_TCP_AddSocket(set, sock);
if (ret == -1)
{
logger->log("Error in SDLNet_AddSocket(): %s", SDLNet_GetError());
return -1;
}
// Init buffers
in = (char*)malloc(buffer_size);
out = (char*)malloc(buffer_size);
memset(in, '\0', buffer_size);
memset(out, '\0', buffer_size);
in_size = 0;
out_size = 0;
logger->log("Network::Started session with %s:%i", address, port);
connectionOpen = true;
return 0;
}
void close_session()
{
assert(connectionOpen);
// Remove the socket from the socket set
int ret = SDLNet_TCP_DelSocket(set, sock);
if (ret == -1)
{
logger->log("Error in SDLNet_DelSocket(): %s", SDLNet_GetError());
}
// Close the TCP connection
SDLNet_TCP_Close(sock);
// Free the socket set
SDLNet_FreeSocketSet(set);
set = NULL;
// Clear buffers
if (in != NULL)
{
free(in);
in = NULL;
}
if (out != NULL)
{
free(out);
out = NULL;
}
in_size = 0;
out_size = 0;
// Shutdown the network API
SDLNet_Quit();
logger->log("Network::Closed session");
connectionOpen = false;
}
void flush()
{
int numReady = SDLNet_CheckSockets(set, 0);
if (numReady == -1)
{
logger->log("Error: SDLNet_CheckSockets");
return;
}
else if (numReady)
{
// Receive data from the socket
int ret = SDLNet_TCP_Recv(sock, in + in_size, buffer_size - in_size);
if (ret <= 0)
{
logger->log("Error in SDLNet_TCP_Recv(): %s", SDLNet_GetError());
errorMessage = "You got disconnected from server";
state = ERROR_STATE;
return;
}
else {
in_size += ret;
}
}
// Send all available data, waits if not all data can be sent immediately
if (out_size > 0)
{
int ret = SDLNet_TCP_Send(sock, (char*)out, out_size);
if (ret < (int)out_size)
{
logger->log("Error in SDLNet_TCP_Send(): %s", SDLNet_GetError());
errorMessage = "You got disconnected from server";
state = ERROR_STATE;
return;
}
out_size -= ret;
}
}
unsigned short readWord(int pos)
{
#if SDL_BYTEORDER == SDL_BIG_ENDIAN
return SDL_Swap16((*(unsigned short*)(in+(pos))));
#else
return (*(unsigned short *)(in+(pos)));
#endif
}
MessageIn
get_next_message()
{
// At least 2 bytes should be received for the message ID
while (in_size < 2) flush();
int length = packet_lengths[readWord(0)];
if (length == -1)
{
// Another 2 bytes should be received for the length
while (in_size < 4) flush();
length = readWord(2);
}
#ifdef DEBUG
printf("Received packet 0x%x of length %d\n", readWord(0), length);
#endif
// Make sure the whole packet is received
while (in_size < (unsigned int)length) flush();
return MessageIn(in, length);
}
void skip(int len)
{
memcpy(in, in + len, in_size - len);
in_size -= len;
}
|
