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Comparing deliantra/server/socket/lowlevel.C (file contents):
Revision 1.5 by root, Sun Sep 10 13:43:33 2006 UTC vs.
Revision 1.60 by root, Mon Oct 1 01:09:10 2007 UTC

1
2/* 1/*
3 * static char *rcsid_sockets_c = 2 * This file is part of Crossfire TRT, the Roguelike Realtime MORPG.
4 * "$Id: lowlevel.C,v 1.5 2006/09/10 13:43:33 root Exp $"; 3 *
4 * Copyright (©) 2005,2006,2007 Marc Alexander Lehmann / Robin Redeker / the Crossfire TRT team
5 * Copyright (©) 1992,2007 Frank Tore Johansen
6 *
7 * Crossfire TRT is free software: you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation, either version 3 of the License, or
10 * (at your option) any later version.
11 *
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
16 *
17 * You should have received a copy of the GNU General Public License
18 * along with this program. If not, see <http://www.gnu.org/licenses/>.
19 *
20 * The authors can be reached via e-mail to <crossfire@schmorp.de>
5 */ 21 */
6 22
7/*
8 CrossFire, A Multiplayer game for X-windows
9
10 Copyright (C) 1992 Frank Tore Johansen
11
12 This program is free software; you can redistribute it and/or modify
13 it under the terms of the GNU General Public License as published by
14 the Free Software Foundation; either version 2 of the License, or
15 (at your option) any later version.
16
17 This program is distributed in the hope that it will be useful,
18 but WITHOUT ANY WARRANTY; without even the implied warranty of
19 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
20 GNU General Public License for more details.
21
22 You should have received a copy of the GNU General Public License
23 along with this program; if not, write to the Free Software
24 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
25
26 The author can be reached via e-mail to mark@pyramid.com
27*/
28
29/**
30 * \file
31 * Low-level socket-related functions.
32 *
33 * \date 2003-12-02
34 *
35 * Contains some base functions that both the client and server
36 * can use. As such, depending what we are being compiled for will
37 * determine what we can include. the client is designed have
38 * CFCLIENT defined as part of its compile flags.
39 */
40
41using namespace std; 23using namespace std;
42 24
43#include <global.h> 25#include <global.h>
44#include <newclient.h>
45#include <sproto.h> 26#include <sproto.h>
27#include <cstdarg>
46 28
47#ifdef __linux__ 29#if HAVE_TCP_INFO
48# include <sys/types.h> 30# include <sys/types.h>
49# include <sys/socket.h> 31# include <sys/socket.h>
50# include <netinet/in.h> 32# include <netinet/in.h>
51# define TCP_HZ 1000 // sorry...
52# include <netinet/tcp.h> 33# include <netinet/tcp.h>
53#endif 34#endif
54 35
55// use a really low timeout, as it doesn't cost any bandwidth, and you can 36// force a packet when idle for more than this many seconds,
56// easily die in 20 seconds... 37// forcing an ack regularly.
57#define SOCKET_TIMEOUT1 10 38#define IDLE_PING 2.
58#define SOCKET_TIMEOUT2 20
59 39
60void 40void
61Socket_Flush (NewSocket * ns) 41client::flush ()
62{ 42{
63#ifdef __linux__ 43 if (destroyed ())
64 // check time of last ack, and, if too old, kill connection 44 return;
65 struct tcp_info tcpi;
66 socklen_t len = sizeof (tcpi);
67 45
68 if (!getsockopt (ns->fd, IPPROTO_TCP, TCP_INFO, &tcpi, &len) && len == sizeof (tcpi)) 46 /**
69 { 47 * Writes data to socket.
70 unsigned int diff = tcpi.tcpi_last_ack_recv - tcpi.tcpi_last_data_sent; 48 *
49 * When the socket is clear to write, and we have backlogged data, this
50 * is called to write it out.
51 */
71 52
72 if (tcpi.tcpi_unacked && SOCKET_TIMEOUT1 * TCP_HZ < diff && diff < 0x80000000UL // ack delayed for 20s 53 // write a nop to the socket at least every IDLE_NOP seconds.
73 && SOCKET_TIMEOUT2 * TCP_HZ < tcpi.tcpi_last_data_sent) // no data sent for 10s 54 if (!outputbuffer.len)
74 { 55 {
75 LOG (llevDebug, "Connection on fd %d closed due to ack timeout (%u/%u/%u)\n", ns->fd, 56 if (last_send + IDLE_PING <= NOW && pl && pl->active)
76 (unsigned) tcpi.tcpi_last_ack_recv, (unsigned) tcpi.tcpi_last_data_sent, (unsigned) tcpi.tcpi_unacked);
77 ns->status = Ns_Dead;
78 } 57 {
58 // this is a bit ugly, but map1/map1a seem to be the only
59 // nop'able commands and they are quite small.
60 packet sl (mapmode == Map1Cmd ? "map1" : "map1a");
61 send_packet (sl);
62 }
63 else
64 return;
65 }
66
67 if (socket_ev.poll () & PE_W)
68 return;
69
70 last_send = NOW;
71 write_outputbuffer ();
72}
73
74void
75client::write_outputbuffer ()
76{
77 while (outputbuffer.len)
79 } 78 {
79 int res = write (fd, outputbuffer.data + outputbuffer.start,
80 min (outputbuffer.len, SOCKETBUFSIZE - outputbuffer.start));
80 81
81 int val; 82 if (res > 0)
83 {
84 outputbuffer.start += res;
85 /* wrap back to start of buffer */
86 if (outputbuffer.start == SOCKETBUFSIZE)
87 outputbuffer.start = 0;
82 88
83 val = 0; 89 outputbuffer.len -= res;
84 setsockopt (ns->fd, IPPROTO_TCP, TCP_CORK, &val, sizeof (val)); 90 }
85 val = 1; 91 else if (res == 0)
86 setsockopt (ns->fd, IPPROTO_TCP, TCP_CORK, &val, sizeof (val)); 92 {
87#endif 93 LOG (llevError, "socket write failed, connection closed.\n");
88} 94 destroy ();
95 return;
96 }
97 else if (errno == EINTR)
98 {
99 // just retry
100 }
101 else if (errno == EAGAIN)
102 {
103 // delay till ready
104 socket_ev.poll (socket_ev.poll () | PE_W);
105 socket_ev.start ();
106 return;
107 }
108 else
109 {
110 LOG (llevError, "socket write failed: %s\n", strerror (errno));
111 destroy ();
112 return;
113 }
114 }
89 115
116 socket_ev.poll (socket_ev.poll () & ~PE_W);
117}
118
119/******************************************************************************
120 *
121 * Start of read routines.
122 *
123 ******************************************************************************/
124
125int
126client::next_packet ()
127{
128 if (inbuf_len >= 2)
129 {
130 int pkt_len = (inbuf [0] << 8) | inbuf [1];
131
132 if (inbuf_len >= 2 + pkt_len)
133 return 2 + pkt_len;
134
135 if (inbuf_len == sizeof (inbuf))
136 {
137 send_packet_printf ("drawinfo %d input buffer overflow - closing connection.", NDI_RED | NDI_REPLY);
138 destroy ();
139 return -1;
140 }
141 }
142
143 return 0;
144}
145
146void
147client::skip_packet (int len)
148{
149 inbuf_len -= len;
150 memmove (inbuf, inbuf + len, inbuf_len);
151}
152
90/*********************************************************************** 153/*****************************************************************************
91 * 154 * Start of command dispatch area.
92 * SockList functions/utilities 155 * The commands here are protocol commands.
93 *
94 **********************************************************************/ 156 ****************************************************************************/
95 157
96void 158// SocketCommand, PlayingCommand, should not exist with those ugly casts
97SockList_Init (SockList * sl) 159#define SC(cb) (void *)static_cast<void (*)(char *, int, client *)>(cb),
98{ 160#define PC(cb) (void *)static_cast<void (*)(char *, int, player *)>(cb), PF_PLAYER |
99 sl->len = 0;
100 sl->buf = NULL;
101}
102 161
103void 162/**
104SockList_AddInt (SockList * sl, uint32 data) 163 * Dispatch table for the server.
105{
106 sl->buf[sl->len++] = (data >> 24) & 0xff;
107 sl->buf[sl->len++] = (data >> 16) & 0xff;
108 sl->buf[sl->len++] = (data >> 8) & 0xff;
109 sl->buf[sl->len++] = data & 0xff;
110}
111
112void
113SockList_AddInt64 (SockList * sl, uint64 data)
114{
115 sl->buf[sl->len++] = (char) ((data >> 56) & 0xff);
116 sl->buf[sl->len++] = (char) ((data >> 48) & 0xff);
117 sl->buf[sl->len++] = (char) ((data >> 40) & 0xff);
118 sl->buf[sl->len++] = (char) ((data >> 32) & 0xff);
119
120 sl->buf[sl->len++] = (char) ((data >> 24) & 0xff);
121 sl->buf[sl->len++] = (char) ((data >> 16) & 0xff);
122 sl->buf[sl->len++] = (char) ((data >> 8) & 0xff);
123 sl->buf[sl->len++] = (char) (data & 0xff);
124}
125
126/* Basically does the reverse of SockList_AddInt, but on
127 * strings instead. Same for the GetShort, but for 16 bits.
128 */ 164 */
129int 165static struct packet_type packets[] = {
130GetInt_String (unsigned char *data) 166 {"ncom", PC(NewPlayerCmd) PF_PLAYING | PF_COMMAND6 },
131{ 167 {"command", PC(PlayerCmd) PF_PLAYING | PF_COMMAND0 },
132 return ((data[0] << 24) + (data[1] << 16) + (data[2] << 8) + data[3]);
133}
134 168
135short 169 {"examine", PC(ExamineCmd) PF_PLAYING },
136GetShort_String (unsigned char *data) 170 {"ex", PC(ExCmd) PF_PLAYING },
137{ 171 {"apply", PC(ApplyCmd) PF_PLAYING },
138 return ((data[0] << 8) + data[1]); 172 {"lookat", PC(LookAt) PF_PLAYING },
139} 173 {"lock", PC(LockItem) PF_PLAYING },
174 {"mark", PC(MarkItem) PF_PLAYING },
175 {"move", PC(MoveCmd) PF_PLAYING },
176 {"ext", PC(ExtCmd) 0 }, // CF+
177 {"mapredraw", PC(MapRedrawCmd) 0 },
178 {"mapinfo", PC(MapInfoCmd) 0 }, // CF+
140 179
141/****************************************************************************** 180 {"reply", SC(ReplyCmd) 0 },
142 * 181 {"exti", SC(ExtiCmd) 0 }, // CF+
143 * Start of read routines. 182 {"addme", SC(AddMeCmd) 0 },
144 * 183 {"askface", SC(AskFaceCmd) 0 },
145 ******************************************************************************/ 184 {"requestinfo", SC(RequestInfo) 0 },
185 {"setfacemode", SC(SetFaceMode) 0 },
186 {"setsound", SC(SetSound) 0 },
187 {"setup", SC(SetUp) 0 },
188 {"version", SC(VersionCmd) 0 },
189 {"toggleextendedinfos", SC(ToggleExtendedInfos) 0 }, /*Added: tchize */
190 {"toggleextendedtext", SC(ToggleExtendedText) 0 }, /*Added: tchize */
191 {"asksmooth", SC(AskSmooth) 0 }, /*Added: tchize (smoothing technologies) */
192};
146 193
147/** 194bool
148 * This reads from fd and puts the data in sl. We return true if we think 195client::may_execute (const packet_type *pkt) const
149 * we have a full packet, 0 if we have a partial packet. The only processing
150 * we do is remove the intial size value. len (As passed) is the size of the
151 * buffer allocated in the socklist. We make the assumption the buffer is
152 * at least 2 bytes long.
153 */
154
155int
156SockList_ReadPacket (int fd, SockList * sl, int len)
157{ 196{
158 int stat, toread; 197 return (!(pkt->flags & PF_PLAYER) || pl)
198 && (!(pkt->flags & PF_PLAYING) || state == ST_PLAYING);
199}
159 200
160 /* Sanity check - shouldn't happen */ 201// HACK: some commands currently should be executed
161 if (sl->len < 0) 202// even when the player is frozen. this hack detects
162 { 203// those commands. it should be folded into may_execute,
163 abort (); 204// but kept seperate to emphasise the hack aspect, i.e.
205// do it better, then remove.
206static bool
207always_immediate (const client *ns, const packet_type *pkt, const char *data, int len)
208{
209 if (!(pkt->flags & (PF_COMMAND0 | PF_COMMAND6)))
210 return false;
211
212 if (!ns->pl || !ns->pl->ob || !ns->pl->ob->map)
213 return false;
214
215 if (pkt->flags & PF_COMMAND6)
164 } 216 {
165 /* We already have a partial packet */ 217 data += 6;
166 if (sl->len < 2) 218 len -= 6;
167 { 219 }
168#ifdef WIN32 /* ***WIN32 SockList_ReadPacket: change read() to recv() */
169 220
170 stat = recv (fd, sl->buf + sl->len, 2 - sl->len, 0); 221 if (len > 4 && !strncmp (data, "say " , 4))
222 return true;
223 if (len > 5 && !strncmp (data, "chat ", 5))
224 return true;
171 225
172#else 226 return false;
173 do 227}
228
229void
230client::execute (const packet_type *pkt, char *data, int datalen)
231{
232 if (may_execute (pkt) || always_immediate (this, pkt, data, datalen))
233 {
234 //TODO: only one format
235 if (pkt->flags & PF_PLAYER)
236 ((void (*)(char *, int, player *))pkt->cb)((char *)data, datalen, pl);
237 else
238 ((void (*)(char *, int, client *))pkt->cb)((char *)data, datalen, this);
239 }
240 else
241 send_packet_printf ("drawinfo %d ERROR: you cannot execute '%s' now.", NDI_RED | NDI_REPLY, pkt->name);
242}
243
244bool
245client::handle_packet ()
246{
247 int pkt_len = next_packet ();
248
249 if (!pkt_len)
250 return false;
251 else if (pkt_len < 0)
252 {
253 LOG (llevError, "read error on player %s\n",
254 pl && pl->ob ? &pl->ob->name : "[anonymous]");
255 destroy ();
256 return false;
257 }
258
259 inbuf [pkt_len] = 0; /* Terminate buffer - useful for string data */
260
261 /* First, break out beginning word. There are at least
262 * a few commands that do not have any paremeters. If
263 * we get such a command, don't worry about trying
264 * to break it up.
265 */
266 int datalen;
267 char *data = strchr ((char *)inbuf + 2, ' ');
268
269 if (data)
270 {
271 *data++ = 0;
272 datalen = pkt_len - (data - (char *)inbuf);
273 }
274 else
275 {
276 data = (char *)inbuf + 2; // better read garbage than segfault
277 datalen = 0;
278 }
279
280 for (packet_type *pkt = packets; pkt < packets + (sizeof (packets) / sizeof (packets[0])); ++pkt)
281 if (!strcmp ((char *)inbuf + 2, pkt->name))
174 { 282 {
175 stat = read (fd, sl->buf + sl->len, 2 - sl->len); 283 if (pkt->flags & PF_PLAYER && !always_immediate (this, pkt, data, datalen))
284 queue_command (pkt, data, datalen);
285 else
286 execute (pkt, data, datalen);
287
288 goto next_packet;
289 }
290
291 // If we get here, we didn't find a valid command.
292 send_packet_printf ("drawinfo %d ERROR: command '%s' not supported.", NDI_RED | NDI_REPLY, (char *)inbuf + 2);
293next_packet:
294 skip_packet (pkt_len);
295
296 // input buffer has space again
297 socket_ev.poll (socket_ev.poll () | PE_R);
298
299 return true;
300}
301
302// callback called when socket is either readable or writable
303void
304client::socket_cb (iow &w, int got)
305{
306 //TODO remove when we have better socket cleanup logic
307 if (destroyed ())
308 {
309 socket_ev.poll (0);
310 return;
311 }
312
313 if (got & PE_W)
314 {
315 write_outputbuffer ();
316
317 if (!outputbuffer.len)
318 socket_ev.poll (socket_ev.poll () & ~PE_W);
319 }
320
321 if (got & PE_R)
322 {
323 //TODO: rate-limit tcp connection in better ways, important
324
325 int amount = sizeof (inbuf) - inbuf_len;
326
327 if (!amount)
176 } 328 {
177 while ((stat == -1) && (errno == EINTR)); 329 // input buffer full
178#endif 330 socket_ev.poll (socket_ev.poll () & ~PE_R);
179 if (stat < 0) 331 return;
180 { 332 }
181 /* In non blocking mode, EAGAIN is set when there is no 333
182 * data available. 334 amount = read (fd, inbuf + inbuf_len, amount);
183 */ 335
184#ifdef WIN32 /* ***WIN32 SockList_ReadPacket: error handling for win32 */ 336 if (!amount)
185 if ((stat == -1) && WSAGetLastError () != WSAEWOULDBLOCK) 337 {
338 destroy ();
339 return;
340 }
341 else if (amount < 0)
342 {
343 if (errno != EAGAIN && errno != EINTR)
186 { 344 {
187 if (WSAGetLastError () == WSAECONNRESET) 345 LOG (llevError, "read error: %s\n", strerror (errno));
188 LOG (llevDebug, "Connection closed by client\n"); 346 destroy ();
189 else 347 return;
190 {
191 LOG (llevDebug, "ReadPacket got error %d, returning 0\n", WSAGetLastError ());
192 }
193 return -1; /* kick this user! */
194 } 348 }
195#else 349
196 if (errno != EAGAIN && errno != EWOULDBLOCK) 350 // should not be here, normally
351 }
352 else
353 {
354 inbuf_len += amount;
355
356 if (handle_packet ())
197 { 357 {
198 LOG (llevDebug, "ReadPacket got error %s, returning 0\n", strerror (errno)); 358 while (handle_packet ())
359 ;
360
361 flush ();
199 } 362 }
200#endif
201 return 0; /*Error */
202 }
203 if (stat == 0)
204 return -1;
205 sl->len += stat;
206#ifdef CS_LOGSTATS
207 cst_tot.ibytes += stat;
208 cst_lst.ibytes += stat;
209#endif
210 if (stat < 2)
211 return 0; /* Still don't have a full packet */
212 }
213 /* Figure out how much more data we need to read. Add 2 from the
214 * end of this - size header information is not included.
215 */
216 toread = 2 + (sl->buf[0] << 8) + sl->buf[1] - sl->len;
217 if ((toread + sl->len) >= len)
218 {
219 LOG (llevError, "SockList_ReadPacket: Want to read more bytes than will fit in buffer (%d>=%d).\n", toread + sl->len, len);
220 /* Quick hack in case for 'oldsocketmode' input. If we are
221 * closing the socket anyways, then reading this extra 100 bytes
222 * shouldn't hurt.
223 */
224#ifdef WIN32 /* ***win32 SockList_ReadPacket: change read() to recv() */
225 recv (fd, sl->buf + 2, 100, 0);
226#else
227 read (fd, sl->buf + 2, 100);
228#endif /* end win32 */
229
230 /* return error so the socket is closed */
231 return -1;
232 }
233 do
234 {
235#ifdef WIN32 /* ***win32 SockList_ReadPacket: change read() to recv() */
236 stat = recv (fd, sl->buf + sl->len, toread, 0);
237#else
238 do
239 { 363 }
240 stat = read (fd, sl->buf + sl->len, toread);
241 }
242 while ((stat < 0) && (errno == EINTR));
243#endif
244 if (stat < 0)
245 {
246
247#ifdef WIN32 /* ***win32 SockList_ReadPacket: change error handling for win32 */
248 if ((stat == -1) && WSAGetLastError () != WSAEWOULDBLOCK)
249 {
250 if (WSAGetLastError () == WSAECONNRESET)
251 LOG (llevDebug, "Connection closed by client\n");
252 else
253 {
254 LOG (llevDebug, "ReadPacket got error %d, returning 0\n", WSAGetLastError ());
255 }
256 return -1; /* kick this user! */
257 }
258#else
259 if (errno != EAGAIN && errno != EWOULDBLOCK)
260 {
261 LOG (llevDebug, "ReadPacket got error %s, returning 0\n", strerror (errno));
262 }
263#endif
264 return 0; /*Error */
265 }
266 if (stat == 0)
267 return -1;
268 sl->len += stat;
269#ifdef CS_LOGSTATS
270 cst_tot.ibytes += stat;
271 cst_lst.ibytes += stat;
272#endif
273 toread -= stat;
274 if (toread == 0)
275 return 1;
276 if (toread < 0)
277 {
278 LOG (llevError, "SockList_ReadPacket: Read more bytes than desired.\n");
279 return 1;
280 }
281 } 364 }
282 while (toread > 0);
283 return 0;
284} 365}
285 366
286/******************************************************************************* 367/*******************************************************************************
287 * 368 *
288 * Start of write related routines. 369 * Start of write related routines.
… …
293 * Adds data to a socket buffer for whatever reason. 374 * Adds data to a socket buffer for whatever reason.
294 * 375 *
295 * ns is the socket we are adding the data to, buf is the start of the 376 * ns is the socket we are adding the data to, buf is the start of the
296 * data, and len is the number of bytes to add. 377 * data, and len is the number of bytes to add.
297 */ 378 */
298 379void
299static void 380client::send (void *buf_, int len)
300add_to_buffer (NewSocket * ns, char *buf, int len)
301{ 381{
382 char *buf = (char *)buf_;
383
384 if (destroyed () || !buf)
385 return;
386
387 if (len + outputbuffer.len > SOCKETBUFSIZE)
388 {
389 LOG (llevDebug, "socket on fd %d has overrun internal buffer - marking as dead\n", fd);
390 // shutdown the socket, this is safer than destroying it immediately
391 // as lots of code in the callchain might still access the map etc.
392 shutdown (fd, SHUT_RDWR);
393 return;
394 }
395
302 int avail, end; 396 int avail, end;
303
304 if ((len + ns->outputbuffer.len) > SOCKETBUFSIZE)
305 {
306 LOG (llevDebug, "Socket on fd %d has overrun internal buffer - marking as dead\n", ns->fd);
307 ns->status = Ns_Dead;
308 return;
309 }
310 397
311 /* data + end is where we start putting the new data. The last byte 398 /* data + end is where we start putting the new data. The last byte
312 * currently in use is actually data + end -1 399 * currently in use is actually data + end -1
313 */ 400 */
314
315 end = ns->outputbuffer.start + ns->outputbuffer.len; 401 end = outputbuffer.start + outputbuffer.len;
316 /* The buffer is already in a wrapped state, so adjust end */ 402 /* The buffer is already in a wrapped state, so adjust end */
317 if (end >= SOCKETBUFSIZE) 403 if (end >= SOCKETBUFSIZE)
318 end -= SOCKETBUFSIZE; 404 end -= SOCKETBUFSIZE;
405
319 avail = SOCKETBUFSIZE - end; 406 avail = SOCKETBUFSIZE - end;
320 407
321 /* We can all fit it behind the current data without wrapping */ 408 /* We can all fit it behind the current data without wrapping */
322 if (avail >= len) 409 if (avail >= len)
323 {
324 memcpy (ns->outputbuffer.data + end, buf, len); 410 memcpy (outputbuffer.data + end, buf, len);
325 }
326 else 411 else
327 { 412 {
328 memcpy (ns->outputbuffer.data + end, buf, avail); 413 memcpy (outputbuffer.data + end, buf, avail);
329 memcpy (ns->outputbuffer.data, buf + avail, len - avail); 414 memcpy (outputbuffer.data, buf + avail, len - avail);
330 } 415 }
416
331 ns->outputbuffer.len += len; 417 outputbuffer.len += len;
332#if 0
333 LOG (llevDebug, "Added %d to output buffer, total length now %d, start=%d\n", len, ns->outputbuffer.len, ns->outputbuffer.start);
334#endif
335} 418}
336
337/**
338 * Writes data to socket.
339 *
340 * When the socket is clear to write, and we have backlogged data, this
341 * is called to write it out.
342 */
343void
344write_socket_buffer (NewSocket * ns)
345{
346 int amt, max;
347
348 if (ns->outputbuffer.len == 0)
349 {
350 LOG (llevDebug, "write_socket_buffer called when there is no data, fd=%d\n", ns->fd);
351 return;
352 }
353
354 do
355 {
356 max = SOCKETBUFSIZE - ns->outputbuffer.start;
357 if (ns->outputbuffer.len < max)
358 max = ns->outputbuffer.len;
359
360#ifdef WIN32 /* ***win32 write_socket_buffer: change write() to send() */
361 amt = send (ns->fd, ns->outputbuffer.data + ns->outputbuffer.start, max, 0);
362#else
363 do
364 {
365 amt = write (ns->fd, ns->outputbuffer.data + ns->outputbuffer.start, max);
366 }
367 while ((amt < 0) && (errno == EINTR));
368#endif
369
370 if (amt < 0)
371 { /* We got an error */
372
373#ifdef WIN32 /* ***win32 write_socket_buffer: change error handling */
374 if (amt == -1 && WSAGetLastError () != WSAEWOULDBLOCK)
375 {
376 LOG (llevError, "New socket write failed (wsb) (%d).\n", WSAGetLastError ());
377#else
378 if (errno != EWOULDBLOCK)
379 {
380 LOG (llevError, "New socket write failed (wsb) (%d: %s).\n", errno, strerror (errno));
381#endif
382 ns->status = Ns_Dead;
383 return;
384 }
385 else
386 { /* EWOULDBLOCK */
387 /* can't write it, so store it away. */
388 ns->can_write = 0;
389 return;
390 }
391 }
392 ns->outputbuffer.start += amt;
393 /* wrap back to start of buffer */
394 if (ns->outputbuffer.start == SOCKETBUFSIZE)
395 ns->outputbuffer.start = 0;
396 ns->outputbuffer.len -= amt;
397#ifdef CS_LOGSTATS
398 cst_tot.obytes += amt;
399 cst_lst.obytes += amt;
400#endif
401 }
402 while (ns->outputbuffer.len > 0);
403}
404
405/**
406 * This writes data to the socket. - It is very low level -
407 * all we try and do is write out the data to the socket
408 * provided (ns). buf is the data to write, len is the number
409 * of bytes to write. IT doesn't return anything - rather, it
410 * updates the ns structure if we get an error.
411 */
412void
413Write_To_Socket (NewSocket * ns, char *buf, int len)
414{
415 int amt = 0;
416 char *pos = buf;
417
418 if (ns->status == Ns_Dead || !buf)
419 {
420 LOG (llevDebug, "Write_To_Socket called with dead socket\n");
421 return;
422 }
423
424#ifndef __GNU__ /* This caused problems on Hurd */
425 if (!ns->can_write)
426 {
427 add_to_buffer (ns, buf, len);
428 return;
429 }
430#endif
431 /* If we manage to write more than we wanted, take it as a bonus */
432 while (len > 0)
433 {
434
435#ifdef WIN32 /* ***win32 Write_To_Socket: change write() to send() */
436 amt = send (ns->fd, pos, len, 0);
437#else
438 do
439 {
440 amt = write (ns->fd, pos, len);
441 }
442 while ((amt < 0) && (errno == EINTR));
443#endif
444
445 if (amt < 0)
446 { /* We got an error */
447#ifdef WIN32 /* ***win32 Write_To_Socket: change error handling */
448 if (amt == -1 && WSAGetLastError () != WSAEWOULDBLOCK)
449 {
450 LOG (llevError, "New socket write failed WTS (%d).\n", WSAGetLastError ());
451#else
452 if (errno != EWOULDBLOCK)
453 {
454 LOG (llevError, "New socket write failed WTS (%d: %s).\n", /* ---WIN32 */
455 errno, strerror (errno));
456#endif
457 ns->status = Ns_Dead;
458 return;
459 }
460 else
461 { /* EWOULDBLOCK */
462 /* can't write it, so store it away. */
463 add_to_buffer (ns, pos, len);
464 ns->can_write = 0;
465 return;
466 }
467 }
468 /* amt gets set to 0 above in blocking code, so we do this as
469 * an else if to make sure we don't reprocess it.
470 */
471 else if (amt == 0)
472 {
473 LOG (llevError, "Write_To_Socket: No data written out.\n");
474 }
475 len -= amt;
476 pos += amt;
477#ifdef CS_LOGSTATS
478 cst_tot.obytes += amt;
479 cst_lst.obytes += amt;
480#endif
481 }
482}
483
484 419
485/** 420/**
486 * Takes a string of data, and writes it out to the socket. A very handy 421 * Takes a string of data, and writes it out to the socket. A very handy
487 * shortcut function. 422 * shortcut function.
488 */ 423 */
489void 424void
490cs_write_string (NewSocket * ns, const char *buf, int len) 425client::send_packet (packet &sl)
491{ 426{
492 SockList sl; 427 if (destroyed ())
493
494 sl.len = len;
495 sl.buf = (unsigned char *) buf;
496 Send_With_Handling (ns, &sl);
497}
498
499
500/**
501 * Calls Write_To_Socket to send data to the client.
502 *
503 * The only difference in this function is that we take a SockList
504 *, and we prepend the length information.
505 */
506void
507Send_With_Handling (NewSocket * ns, SockList * msg)
508{
509 unsigned char sbuf[4];
510
511 if (ns->status == Ns_Dead || !msg)
512 return; 428 return;
513 429
514 if (msg->len >= MAXSOCKBUF) 430 if (sl.length () > MAXSOCKBUF)
515 { 431 {
516 LOG (llevError, "Trying to send a buffer beyond properly size, len =%d\n", msg->len); 432 LOG (llevError, "Trying to send a buffer beyond properly size, len =%d\n", sl.length ());
517 /* Almost certainly we've overflowed a buffer, so quite now to make 433 /* Almost certainly we've overflowed a buffer, so quit now to make
518 * it easier to debug. 434 * it easier to debug.
519 */ 435 */
520 abort (); 436 abort ();
521 } 437 }
522 sbuf[0] = ((uint32) (msg->len) >> 8) & 0xFF;
523 sbuf[1] = ((uint32) (msg->len)) & 0xFF;
524 if (ns->status != Ns_Old)
525 Write_To_Socket (ns, (char *) sbuf, 2);
526 Write_To_Socket (ns, (char *) msg->buf, msg->len);
527}
528 438
529/** 439 if (!sl.length ())
530 * Takes a string of data, and writes it out to the socket. A very handy
531 * shortcut function.
532 */
533void
534Write_String_To_Socket (NewSocket * ns, char *buf, int len)
535{
536 SockList sl;
537
538 sl.len = len;
539 sl.buf = (unsigned char *) buf;
540 Send_With_Handling (ns, &sl);
541}
542
543
544/******************************************************************************
545 *
546 * statistics logging functions.
547 *
548 ******************************************************************************/
549
550#ifdef CS_LOGSTATS
551
552/* cst_tot is for the life of the server, cst_last is for the last series of
553 * stats
554 */
555CS_Stats cst_tot, cst_lst;
556
557/**
558 * Writes out the gathered stats. We clear cst_lst.
559 */
560void
561write_cs_stats (void)
562{
563 time_t now = time (NULL);
564
565 /* If no connections recently, don't both to log anything */
566 if (cst_lst.ibytes == 0 && cst_lst.obytes == 0)
567 return; 440 return;
568 441
569 /* CSSTAT is put in so scripts can easily find the line */ 442 assert (sl.hdrlen == 2);
570 LOG (llevInfo, "CSSTAT: %.16s tot %d %d %d %d inc %d %d %d %d\n", 443
571 ctime (&now), cst_tot.ibytes, cst_tot.obytes, cst_tot.max_conn, 444 sl.buf_ [0] = sl.length () >> 8;
572 now - cst_tot.time_start, cst_lst.ibytes, cst_lst.obytes, cst_lst.max_conn, now - cst_lst.time_start); 445 sl.buf_ [1] = sl.length () ;
573 cst_lst.ibytes = 0; 446
574 cst_lst.obytes = 0; 447 send (sl.buf_, sl.length () + sl.hdrlen);
575 cst_lst.max_conn = socket_info.nconns;
576 cst_lst.time_start = now;
577} 448}
578#endif 449
450void
451client::send_packet (const char *buf, int len)
452{
453 packet sl;
454
455 sl << data (buf, len);
456 send_packet (sl);
457}
458
459void
460client::send_packet (const char *buf)
461{
462 send_packet (buf, strlen (buf));
463}
464
465void
466client::send_packet_printf (const char *format, ...)
467{
468 packet sl;
469
470 va_list ap;
471 va_start (ap, format);
472 sl.vprintf (format, ap);
473 va_end (ap);
474
475 send_packet (sl);
476}
477
478// returns true when the message needs special (read: perl) treatment
479static bool
480msg_is_special (const char *msg)
481{
482 return msg [strcspn (msg, "<[&\n")];
483}
484
485void
486client::send_msg (int color, const char *type, const char *msg)
487{
488 if (!msg || !type) // it can happen (for example, missing attack messages cause this)
489 {
490 LOG (logBacktrace | llevError, "send_msg(%d,%p,%p) called with NULL msg or type.\n", color, type, msg);
491 return;
492 }
493
494 int len = strlen (msg);
495
496 if (msg_is_special (msg) || (type [0] == 'c' && type [1] == '/') || len > (MAXSOCKBUF - 128))
497 cfperl_send_msg (this, color, type, msg);
498 else if (can_msg)
499 send_packet_printf ("msg %d %s %s", color & NDI_CLIENT_MASK, type, msg);
500 else if (color < 0)
501 return; // client cannot handle this
502 else
503 send_packet_printf ("drawinfo %d %s", color & NDI_COLOR_MASK, msg);
504}
505
506void
507client::send_drawinfo (const char *msg, int flags)
508{
509 send_msg (flags, "log", msg);
510}
511
512/***********************************************************************
513 *
514 * packet functions/utilities
515 *
516 **********************************************************************/
517
518packet::packet (const char *name)
519{
520 reset ();
521
522 int len = strlen (name);
523 memcpy (cur, name, len); cur += len;
524 *cur++ = ' ';
525}
526
527packet &packet::operator <<(const ber32 v)
528{
529 enum { maxlen = 32 / 7 + 1};
530 uint8 buf[maxlen];
531 uint8 *p = buf + maxlen;
532 uint32 val = v.val;
533
534 *--p = val & 0x7F;
535
536 while (val > 0x7F)
537 {
538 val >>= 7;
539 *--p = (val & 0x7F) | 0x80;
540 }
541
542 return *this << data (p, buf + maxlen - p);
543}
544
545packet &packet::operator <<(const data &v)
546{
547 if (room () < v.len)
548 reset ();
549 else
550 {
551 if (v.len)
552 {
553 memcpy (cur, v.ptr, v.len);
554 cur += v.len;
555 }
556 }
557
558 return *this;
559}
560
561packet &packet::operator <<(const data8 &v)
562{
563 unsigned int len = min (v.len, 0x00FF);
564 return *this << uint8 (len) << data (v.ptr, len);
565}
566
567packet &packet::operator <<(const data16 &v)
568{
569 unsigned int len = min (v.len, 0xFFFF);
570 return *this << uint16 (len) << data (v.ptr, len);
571}
572
573packet &packet::operator <<(const char *v)
574{
575 return *this << data (v, strlen (v ? v : 0));
576}
577
578void
579packet::vprintf (const char *format, va_list ap)
580{
581 int size = room ();
582
583 int len = vsnprintf ((char *)cur, size, format, ap);
584
585 if (len >= size)
586 return reset ();
587
588 cur += len;
589}
590

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