1 | /* |
1 | /* |
2 | * This file is part of Crossfire TRT, the Multiplayer Online Role Playing Game. |
2 | * This file is part of Deliantra, the Roguelike Realtime MMORPG. |
3 | * |
3 | * |
4 | * Copyright (©) 2005,2006,2007 Marc Alexander Lehmann / Robin Redeker / the Crossfire TRT team |
4 | * Copyright (©) 2005,2006,2007,2008,2009 Marc Alexander Lehmann / Robin Redeker / the Deliantra team |
5 | * Copyright (©) 1992,2007 Frank Tore Johansen |
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6 | * |
5 | * |
7 | * Crossfire TRT is free software; you can redistribute it and/or modify it |
6 | * Deliantra is free software: you can redistribute it and/or modify it under |
8 | * under the terms of the GNU General Public License as published by the Free |
7 | * the terms of the Affero GNU General Public License as published by the |
9 | * Software Foundation; either version 2 of the License, or (at your option) |
8 | * Free Software Foundation, either version 3 of the License, or (at your |
10 | * any later version. |
9 | * option) any later version. |
11 | * |
10 | * |
12 | * This program is distributed in the hope that it will be useful, but |
11 | * This program is distributed in the hope that it will be useful, |
13 | * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY |
12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
14 | * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
15 | * for more details. |
14 | * GNU General Public License for more details. |
16 | * |
15 | * |
17 | * You should have received a copy of the GNU General Public License along |
16 | * You should have received a copy of the Affero GNU General Public License |
18 | * with Crossfire TRT; if not, write to the Free Software Foundation, Inc. 51 |
17 | * and the GNU General Public License along with this program. If not, see |
19 | * Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
18 | * <http://www.gnu.org/licenses/>. |
20 | * |
19 | * |
21 | * The authors can be reached via e-mail to <crossfire@schmorp.de> |
20 | * The authors can be reached via e-mail to <support@deliantra.net> |
22 | */ |
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23 | |
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24 | /** |
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25 | * \file |
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26 | * Low-level socket-related functions. |
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27 | * |
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28 | * \date 2003-12-02 |
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29 | * |
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30 | * Contains some base functions that both the client and server |
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31 | * can use. As such, depending what we are being compiled for will |
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32 | * determine what we can include. the client is designed have |
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33 | * CFCLIENT defined as part of its compile flags. |
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34 | */ |
21 | */ |
35 | |
22 | |
36 | using namespace std; |
23 | using namespace std; |
37 | |
24 | |
38 | #include <global.h> |
25 | #include <global.h> |
39 | #include <sproto.h> |
26 | #include <sproto.h> |
40 | #include <cstdarg> |
27 | #include <cstdarg> |
41 | |
28 | |
42 | #ifdef __linux__ |
29 | #if HAVE_TCP_INFO |
43 | # include <sys/types.h> |
30 | # include <sys/types.h> |
44 | # include <sys/socket.h> |
31 | # include <sys/socket.h> |
45 | # include <netinet/in.h> |
32 | # include <netinet/in.h> |
46 | # include <netinet/tcp.h> |
33 | # include <netinet/tcp.h> |
47 | #endif |
34 | #endif |
48 | |
35 | |
49 | // disconnect a socket after this many seconds without an ack |
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50 | #define SOCKET_TIMEOUT 8. |
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51 | |
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52 | // force a packet when idle for more than this many seconds, |
36 | // force a packet when idle for more than this many seconds, |
53 | // forcing an ack regularly. |
37 | // forcing an ack regularly. |
54 | #define IDLE_PING 2. |
38 | #define IDLE_PING 2. |
55 | |
39 | |
56 | void |
40 | void |
57 | client::flush () |
41 | client::flush () |
58 | { |
42 | { |
59 | if (destroyed ()) |
43 | if (destroyed ()) |
60 | return; |
44 | return; |
61 | |
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62 | #ifdef __linux__ //TODO: this is available on bsds, too, use a configure test. |
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63 | // check about once per second, spread evenly over all clients |
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64 | if (!((pticks + fd) & 7)) |
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65 | { |
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66 | // check time of last ack, and, if too old, kill connection |
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67 | struct tcp_info tcpi; |
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68 | socklen_t len = sizeof (tcpi); |
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69 | |
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70 | if (!getsockopt (fd, IPPROTO_TCP, TCP_INFO, &tcpi, &len) && len == sizeof (tcpi)) |
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71 | { |
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72 | rtt = tcpi.tcpi_rtt; |
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73 | rttvar = tcpi.tcpi_rttvar; |
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74 | |
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75 | if (tcpi.tcpi_last_ack_recv > int (SOCKET_TIMEOUT * 1000)) |
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76 | { |
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77 | send_msg (NDI_RED, "connection-timeout", "safety disconnect due to tcp/ip timeout (no packets received)"); |
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78 | write_outputbuffer (); |
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79 | |
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80 | LOG (llevDebug, "connection on fd %d closed due to ack timeout (%u/%u/%u)\n", fd, |
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81 | (unsigned)tcpi.tcpi_last_ack_recv, (unsigned)tcpi.tcpi_last_data_sent, (unsigned)tcpi.tcpi_unacked); |
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82 | destroy (); |
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83 | } |
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84 | } |
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85 | } |
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86 | #endif |
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87 | |
45 | |
88 | /** |
46 | /** |
89 | * Writes data to socket. |
47 | * Writes data to socket. |
90 | * |
48 | * |
91 | * When the socket is clear to write, and we have backlogged data, this |
49 | * When the socket is clear to write, and we have backlogged data, this |
… | |
… | |
93 | */ |
51 | */ |
94 | |
52 | |
95 | // write a nop to the socket at least every IDLE_NOP seconds. |
53 | // write a nop to the socket at least every IDLE_NOP seconds. |
96 | if (!outputbuffer.len) |
54 | if (!outputbuffer.len) |
97 | { |
55 | { |
98 | if (last_send + IDLE_PING <= NOW) |
56 | if (last_send + IDLE_PING <= NOW && pl && pl->active) |
99 | { |
57 | { |
100 | // this is a bit ugly, but map1/map1a seem to be the only |
58 | // this is a bit ugly, but map1/map1a seem to be the only |
101 | // nop'able commands and they are quite small. |
59 | // nop'able commands and they are quite small. |
102 | packet sl (mapmode == Map1Cmd ? "map1" : "map1a"); |
60 | packet sl (mapmode == Map1Cmd ? "map1" : "map1a"); |
103 | send_packet (sl); |
61 | send_packet (sl); |
104 | } |
62 | } |
105 | else |
63 | else |
106 | return; |
64 | return; |
107 | } |
65 | } |
108 | |
66 | |
109 | if (socket_ev.poll () & PE_W) |
67 | if (socket_ev.poll () & EV_WRITE) |
110 | return; |
68 | return; |
111 | |
69 | |
112 | last_send = NOW; |
70 | last_send = NOW; |
113 | write_outputbuffer (); |
71 | write_outputbuffer (); |
114 | } |
72 | } |
… | |
… | |
141 | // just retry |
99 | // just retry |
142 | } |
100 | } |
143 | else if (errno == EAGAIN) |
101 | else if (errno == EAGAIN) |
144 | { |
102 | { |
145 | // delay till ready |
103 | // delay till ready |
146 | socket_ev.poll (socket_ev.poll () | PE_W); |
104 | socket_ev.poll (socket_ev.poll () | EV_WRITE); |
147 | socket_ev.start (); |
105 | socket_ev.start (); |
148 | return; |
106 | return; |
149 | } |
107 | } |
150 | else |
108 | else |
151 | { |
109 | { |
… | |
… | |
153 | destroy (); |
111 | destroy (); |
154 | return; |
112 | return; |
155 | } |
113 | } |
156 | } |
114 | } |
157 | |
115 | |
158 | socket_ev.poll (socket_ev.poll () & ~PE_W); |
116 | socket_ev.poll (socket_ev.poll () & ~EV_WRITE); |
159 | } |
117 | } |
160 | |
118 | |
161 | /****************************************************************************** |
119 | /****************************************************************************** |
162 | * |
120 | * |
163 | * Start of read routines. |
121 | * Start of read routines. |
… | |
… | |
174 | if (inbuf_len >= 2 + pkt_len) |
132 | if (inbuf_len >= 2 + pkt_len) |
175 | return 2 + pkt_len; |
133 | return 2 + pkt_len; |
176 | |
134 | |
177 | if (inbuf_len == sizeof (inbuf)) |
135 | if (inbuf_len == sizeof (inbuf)) |
178 | { |
136 | { |
179 | send_packet_printf ("drawinfo %d input buffer overflow - closing connection.", NDI_RED); |
137 | send_packet_printf ("drawinfo %d input buffer overflow - closing connection.", NDI_RED | NDI_REPLY); |
180 | destroy (); |
138 | destroy (); |
181 | return -1; |
139 | return -1; |
182 | } |
140 | } |
183 | } |
141 | } |
184 | |
142 | |
… | |
… | |
222 | {"reply", SC(ReplyCmd) 0 }, |
180 | {"reply", SC(ReplyCmd) 0 }, |
223 | {"exti", SC(ExtiCmd) 0 }, // CF+ |
181 | {"exti", SC(ExtiCmd) 0 }, // CF+ |
224 | {"addme", SC(AddMeCmd) 0 }, |
182 | {"addme", SC(AddMeCmd) 0 }, |
225 | {"askface", SC(AskFaceCmd) 0 }, |
183 | {"askface", SC(AskFaceCmd) 0 }, |
226 | {"requestinfo", SC(RequestInfo) 0 }, |
184 | {"requestinfo", SC(RequestInfo) 0 }, |
227 | {"setfacemode", SC(SetFaceMode) 0 }, |
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228 | {"setsound", SC(SetSound) 0 }, |
185 | {"setsound", SC(SetSound) 0 }, |
229 | {"setup", SC(SetUp) 0 }, |
186 | {"setup", SC(SetUp) 0 }, |
230 | {"version", SC(VersionCmd) 0 }, |
187 | {"version", SC(VersionCmd) 0 }, |
231 | {"toggleextendedinfos", SC(ToggleExtendedInfos) 0 }, /*Added: tchize */ |
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232 | {"toggleextendedtext", SC(ToggleExtendedText) 0 }, /*Added: tchize */ |
188 | {"toggleextendedtext", SC(ToggleExtendedText) 0 }, /*Added: tchize */ |
233 | {"asksmooth", SC(AskSmooth) 0 }, /*Added: tchize (smoothing technologies) */ |
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234 | }; |
189 | }; |
235 | |
190 | |
236 | bool |
191 | bool |
237 | client::may_execute (const packet_type *pkt) const |
192 | client::may_execute (const packet_type *pkt) const |
238 | { |
193 | { |
… | |
… | |
258 | { |
213 | { |
259 | data += 6; |
214 | data += 6; |
260 | len -= 6; |
215 | len -= 6; |
261 | } |
216 | } |
262 | |
217 | |
263 | if (len > 4 && !strncmp (data, "say " , 4)) |
218 | if (len > 4 && data [ 3] == ' ' && !strncmp (data, "say " , 4)) return true; |
264 | return true; |
219 | if (len > 5 && data [ 4] == ' ' && !strncmp (data, "chat " , 5)) return true; |
265 | if (len > 5 && !strncmp (data, "chat ", 5)) |
220 | if (len > 6 && data [ 5] == ' ' && !strncmp (data, "shout " , 6)) return true; |
266 | return true; |
221 | if (len > 8 && data [ 7] == ' ' && !strncmp (data, "suicide " , 8)) return true; |
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222 | if (len > 18 && data [17] == ' ' && !strncmp (data, "accept-invitation ", 18)) return true; |
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223 | |
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224 | if (len == 7 && !strcmp (data, "suicide")) return true; |
267 | |
225 | |
268 | return false; |
226 | return false; |
269 | } |
227 | } |
270 | |
228 | |
271 | void |
229 | void |
… | |
… | |
273 | { |
231 | { |
274 | if (may_execute (pkt) || always_immediate (this, pkt, data, datalen)) |
232 | if (may_execute (pkt) || always_immediate (this, pkt, data, datalen)) |
275 | { |
233 | { |
276 | //TODO: only one format |
234 | //TODO: only one format |
277 | if (pkt->flags & PF_PLAYER) |
235 | if (pkt->flags & PF_PLAYER) |
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236 | { |
278 | ((void (*)(char *, int, player *))pkt->cb)((char *)data, datalen, pl); |
237 | ((void (*)(char *, int, player *))pkt->cb)((char *)data, datalen, pl); |
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238 | pl->need_updated_stats (); |
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239 | } |
279 | else |
240 | else |
280 | ((void (*)(char *, int, client *))pkt->cb)((char *)data, datalen, this); |
241 | ((void (*)(char *, int, client *))pkt->cb)((char *)data, datalen, this); |
281 | } |
242 | } |
282 | else |
243 | else |
283 | send_packet_printf ("drawinfo %d ERROR: you cannot execute '%s' now.", NDI_RED, pkt->name); |
244 | send_packet_printf ("drawinfo %d ERROR: you cannot execute '%s' now.", NDI_RED | NDI_REPLY, pkt->name); |
284 | } |
245 | } |
285 | |
246 | |
286 | bool |
247 | bool |
287 | client::handle_packet () |
248 | client::handle_packet () |
288 | { |
249 | { |
… | |
… | |
296 | pl && pl->ob ? &pl->ob->name : "[anonymous]"); |
257 | pl && pl->ob ? &pl->ob->name : "[anonymous]"); |
297 | destroy (); |
258 | destroy (); |
298 | return false; |
259 | return false; |
299 | } |
260 | } |
300 | |
261 | |
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262 | uint8_t save_byte = inbuf [pkt_len]; // rather ugly |
301 | inbuf [pkt_len] = 0; /* Terminate buffer - useful for string data */ |
263 | inbuf [pkt_len] = 0; /* temporarily terminate buffer - useful for string data */ |
302 | |
264 | |
303 | /* First, break out beginning word. There are at least |
265 | /* First, break out beginning word. There are at least |
304 | * a few commands that do not have any paremeters. If |
266 | * a few commands that do not have any paremeters. If |
305 | * we get such a command, don't worry about trying |
267 | * we get such a command, don't worry about trying |
306 | * to break it up. |
268 | * to break it up. |
… | |
… | |
329 | |
291 | |
330 | goto next_packet; |
292 | goto next_packet; |
331 | } |
293 | } |
332 | |
294 | |
333 | // If we get here, we didn't find a valid command. |
295 | // If we get here, we didn't find a valid command. |
334 | send_packet_printf ("drawinfo %d ERROR: command '%s' not supported.", NDI_RED, (char *)inbuf + 2); |
296 | send_packet_printf ("drawinfo %d ERROR: command '%s' not supported.", NDI_RED | NDI_REPLY, (char *)inbuf + 2); |
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297 | |
335 | next_packet: |
298 | next_packet: |
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299 | inbuf [pkt_len] = save_byte; // rather ugly |
336 | skip_packet (pkt_len); |
300 | skip_packet (pkt_len); |
337 | |
301 | |
338 | // input buffer has space again |
302 | // input buffer has space again |
339 | socket_ev.poll (socket_ev.poll () | PE_R); |
303 | socket_ev.poll (socket_ev.poll () | EV_READ); |
340 | |
304 | |
341 | return true; |
305 | return true; |
342 | } |
306 | } |
343 | |
307 | |
344 | // callback called when socket is either readable or writable |
308 | // callback called when socket is either readable or writable |
345 | void |
309 | void |
346 | client::socket_cb (iow &w, int got) |
310 | client::socket_cb (iow &w, int revents) |
347 | { |
311 | { |
348 | //TODO remove when we have better socket cleanup logic |
312 | //TODO remove when we have better socket cleanup logic |
349 | if (destroyed ()) |
313 | if (destroyed ()) |
350 | { |
314 | { |
351 | socket_ev.poll (0); |
315 | socket_ev.poll (0); |
352 | return; |
316 | return; |
353 | } |
317 | } |
354 | |
318 | |
355 | if (got & PE_W) |
319 | if (revents & EV_WRITE) |
356 | { |
320 | { |
357 | write_outputbuffer (); |
321 | write_outputbuffer (); |
358 | |
322 | |
359 | if (!outputbuffer.len) |
323 | if (!outputbuffer.len) |
360 | socket_ev.poll (socket_ev.poll () & ~PE_W); |
324 | socket_ev.poll (socket_ev.poll () & ~EV_WRITE); |
361 | } |
325 | } |
362 | |
326 | |
363 | if (got & PE_R) |
327 | if (revents & EV_READ) |
364 | { |
328 | { |
365 | //TODO: rate-limit tcp connection in better ways, important |
329 | //TODO: rate-limit tcp connection in better ways, important |
366 | |
330 | |
367 | int amount = sizeof (inbuf) - inbuf_len; |
331 | int amount = sizeof (inbuf) - inbuf_len; |
368 | |
332 | |
369 | if (!amount) |
333 | if (!amount) |
370 | { |
334 | { |
371 | // input buffer full |
335 | // input buffer full |
372 | socket_ev.poll (socket_ev.poll () & ~PE_R); |
336 | socket_ev.poll (socket_ev.poll () & ~EV_READ); |
373 | return; |
337 | return; |
374 | } |
338 | } |
375 | |
339 | |
376 | amount = read (fd, inbuf + inbuf_len, amount); |
340 | amount = read (fd, inbuf + inbuf_len, amount); |
377 | |
341 | |
… | |
… | |
393 | } |
357 | } |
394 | else |
358 | else |
395 | { |
359 | { |
396 | inbuf_len += amount; |
360 | inbuf_len += amount; |
397 | |
361 | |
398 | cmd_ev.start (); |
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399 | } |
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400 | } |
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401 | } |
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402 | |
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403 | // called whenever we have additional commands to process |
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404 | void |
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405 | client::cmd_cb (iw &w) |
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406 | { |
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407 | if (handle_packet ()) |
362 | if (handle_packet ()) |
408 | w.start (); |
363 | { |
409 | else |
364 | while (handle_packet ()) |
410 | flush (); |
365 | ; |
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366 | |
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367 | flush (); |
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368 | } |
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369 | } |
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370 | } |
411 | } |
371 | } |
412 | |
372 | |
413 | /******************************************************************************* |
373 | /******************************************************************************* |
414 | * |
374 | * |
415 | * Start of write related routines. |
375 | * Start of write related routines. |
… | |
… | |
471 | client::send_packet (packet &sl) |
431 | client::send_packet (packet &sl) |
472 | { |
432 | { |
473 | if (destroyed ()) |
433 | if (destroyed ()) |
474 | return; |
434 | return; |
475 | |
435 | |
476 | if (sl.length () >= MAXSOCKBUF) |
436 | if (sl.length () > MAXSOCKBUF) |
477 | { |
437 | { |
478 | LOG (llevError, "Trying to send a buffer beyond properly size, len =%d\n", sl.length ()); |
438 | LOG (llevError, "Trying to send a buffer beyond properly size, len =%d\n", sl.length ()); |
479 | /* Almost certainly we've overflowed a buffer, so quit now to make |
439 | /* Almost certainly we've overflowed a buffer, so quit now to make |
480 | * it easier to debug. |
440 | * it easier to debug. |
481 | */ |
441 | */ |
… | |
… | |
520 | |
480 | |
521 | send_packet (sl); |
481 | send_packet (sl); |
522 | } |
482 | } |
523 | |
483 | |
524 | void |
484 | void |
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485 | client::send_msg (int color, const char *type, const char *msg) |
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486 | { |
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487 | if (!msg || !type) // it can happen (for example, missing attack messages cause this) |
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488 | { |
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489 | LOG (logBacktrace | llevError, "send_msg(%d,%p,%p) called with NULL msg or type.\n", color, type, msg); |
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490 | return; |
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491 | } |
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492 | |
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493 | int len = strlen (msg); |
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494 | |
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495 | if (!(color & NDI_VERBATIM) |
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496 | && (msg_is_special (msg) |
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497 | || (type [0] == 'c' && type [1] == '/') || len > (MAXSOCKBUF - 128))) |
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498 | cfperl_send_msg (this, color, type, msg); |
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499 | else |
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500 | send_packet_printf ("msg %d %s %s", color & NDI_CLIENT_MASK, type, msg); |
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501 | } |
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502 | |
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503 | void |
525 | client::send_drawinfo (const char *msg, int flags) |
504 | client::send_drawinfo (const char *msg, int flags) |
526 | { |
505 | { |
527 | send_packet_printf ("drawinfo %d %s", flags, msg); |
506 | send_msg (flags, "log", msg); |
528 | } |
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529 | |
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530 | void |
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531 | client::send_msg (int color, const char *type, const char *msg) |
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532 | { |
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533 | if (can_msg) |
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534 | send_packet_printf ("msg %d %s %s", color, type, msg); |
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535 | else if (color < 0) |
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536 | return; // client cannot handle this |
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537 | else if (strchr (msg, '<') || strchr (msg, '&')) |
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538 | { |
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539 | //TODO: should escape/modify to old syntax |
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540 | send_packet_printf ("drawinfo %d %s", color, msg); |
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541 | } |
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542 | else |
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543 | send_packet_printf ("drawinfo %d %s", color, msg); |
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544 | } |
507 | } |
545 | |
508 | |
546 | /*********************************************************************** |
509 | /*********************************************************************** |
547 | * |
510 | * |
548 | * packet functions/utilities |
511 | * packet functions/utilities |