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Comparing deliantra/server/socket/lowlevel.C (file contents):
Revision 1.8 by pippijn, Mon Dec 11 19:46:47 2006 UTC vs.
Revision 1.71 by root, Mon Oct 12 14:00:59 2009 UTC

1/* 1/*
2 CrossFire, A Multiplayer game for X-windows 2 * This file is part of Deliantra, the Roguelike Realtime MMORPG.
3 3 *
4 * Copyright (©) 2005,2006,2007,2008 Marc Alexander Lehmann / Robin Redeker / the Deliantra team
4 Copyright (C) 1992 Frank Tore Johansen 5 * Copyright (©) 1992,2007 Frank Tore Johansen
5 6 *
6 This program is free software; you can redistribute it and/or modify 7 * Deliantra is free software: you can redistribute it and/or modify it under
7 it under the terms of the GNU General Public License as published by 8 * the terms of the Affero GNU General Public License as published by the
8 the Free Software Foundation; either version 2 of the License, or 9 * Free Software Foundation, either version 3 of the License, or (at your
9 (at your option) any later version. 10 * option) any later version.
10 11 *
11 This program is distributed in the hope that it will be useful, 12 * This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of 13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details. 15 * GNU General Public License for more details.
15 16 *
16 You should have received a copy of the GNU General Public License 17 * You should have received a copy of the Affero GNU General Public License
17 along with this program; if not, write to the Free Software 18 * and the GNU General Public License along with this program. If not, see
18 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. 19 * <http://www.gnu.org/licenses/>.
19
20 The author can be reached via e-mail to mark@pyramid.com
21*/
22
23/**
24 * \file
25 * Low-level socket-related functions.
26 * 20 *
27 * \date 2003-12-02 21 * The authors can be reached via e-mail to <support@deliantra.net>
28 *
29 * Contains some base functions that both the client and server
30 * can use. As such, depending what we are being compiled for will
31 * determine what we can include. the client is designed have
32 * CFCLIENT defined as part of its compile flags.
33 */ 22 */
34 23
35using namespace std; 24using namespace std;
36 25
37#include <global.h> 26#include <global.h>
38#include <newclient.h>
39#include <sproto.h> 27#include <sproto.h>
28#include <cstdarg>
40 29
41#ifdef __linux__ 30#if HAVE_TCP_INFO
42# include <sys/types.h> 31# include <sys/types.h>
43# include <sys/socket.h> 32# include <sys/socket.h>
44# include <netinet/in.h> 33# include <netinet/in.h>
45# define TCP_HZ 1000 // sorry...
46# include <netinet/tcp.h> 34# include <netinet/tcp.h>
47#endif 35#endif
48 36
49// use a really low timeout, as it doesn't cost any bandwidth, and you can 37// force a packet when idle for more than this many seconds,
50// easily die in 20 seconds... 38// forcing an ack regularly.
51#define SOCKET_TIMEOUT1 10 39#define IDLE_PING 2.
52#define SOCKET_TIMEOUT2 20
53 40
54void 41void
55Socket_Flush (NewSocket * ns) 42client::flush ()
56{ 43{
57#ifdef __linux__ 44 if (destroyed ())
58 // check time of last ack, and, if too old, kill connection 45 return;
59 struct tcp_info tcpi;
60 socklen_t len = sizeof (tcpi);
61 46
62 if (!getsockopt (ns->fd, IPPROTO_TCP, TCP_INFO, &tcpi, &len) && len == sizeof (tcpi)) 47 /**
63 { 48 * Writes data to socket.
64 unsigned int diff = tcpi.tcpi_last_ack_recv - tcpi.tcpi_last_data_sent; 49 *
50 * When the socket is clear to write, and we have backlogged data, this
51 * is called to write it out.
52 */
65 53
66 if (tcpi.tcpi_unacked && SOCKET_TIMEOUT1 * TCP_HZ < diff && diff < 0x80000000UL // ack delayed for 20s 54 // write a nop to the socket at least every IDLE_NOP seconds.
67 && SOCKET_TIMEOUT2 * TCP_HZ < tcpi.tcpi_last_data_sent) // no data sent for 10s 55 if (!outputbuffer.len)
68 { 56 {
69 LOG (llevDebug, "Connection on fd %d closed due to ack timeout (%u/%u/%u)\n", ns->fd, 57 if (last_send + IDLE_PING <= NOW && pl && pl->active)
70 (unsigned) tcpi.tcpi_last_ack_recv, (unsigned) tcpi.tcpi_last_data_sent, (unsigned) tcpi.tcpi_unacked);
71 ns->status = Ns_Dead;
72 } 58 {
59 // this is a bit ugly, but map1/map1a seem to be the only
60 // nop'able commands and they are quite small.
61 packet sl (mapmode == Map1Cmd ? "map1" : "map1a");
62 send_packet (sl);
63 }
64 else
65 return;
66 }
67
68 if (socket_ev.poll () & EV_WRITE)
69 return;
70
71 last_send = NOW;
72 write_outputbuffer ();
73}
74
75void
76client::write_outputbuffer ()
77{
78 while (outputbuffer.len)
73 } 79 {
80 int res = write (fd, outputbuffer.data + outputbuffer.start,
81 min (outputbuffer.len, SOCKETBUFSIZE - outputbuffer.start));
74 82
75 int val; 83 if (res > 0)
84 {
85 outputbuffer.start += res;
86 /* wrap back to start of buffer */
87 if (outputbuffer.start == SOCKETBUFSIZE)
88 outputbuffer.start = 0;
76 89
77 val = 0; 90 outputbuffer.len -= res;
78 setsockopt (ns->fd, IPPROTO_TCP, TCP_CORK, &val, sizeof (val)); 91 }
79 val = 1; 92 else if (res == 0)
80 setsockopt (ns->fd, IPPROTO_TCP, TCP_CORK, &val, sizeof (val)); 93 {
81#endif 94 LOG (llevError, "socket write failed, connection closed.\n");
82} 95 destroy ();
96 return;
97 }
98 else if (errno == EINTR)
99 {
100 // just retry
101 }
102 else if (errno == EAGAIN)
103 {
104 // delay till ready
105 socket_ev.poll (socket_ev.poll () | EV_WRITE);
106 socket_ev.start ();
107 return;
108 }
109 else
110 {
111 LOG (llevError, "socket write failed: %s\n", strerror (errno));
112 destroy ();
113 return;
114 }
115 }
83 116
117 socket_ev.poll (socket_ev.poll () & ~EV_WRITE);
118}
119
120/******************************************************************************
121 *
122 * Start of read routines.
123 *
124 ******************************************************************************/
125
126int
127client::next_packet ()
128{
129 if (inbuf_len >= 2)
130 {
131 int pkt_len = (inbuf [0] << 8) | inbuf [1];
132
133 if (inbuf_len >= 2 + pkt_len)
134 return 2 + pkt_len;
135
136 if (inbuf_len == sizeof (inbuf))
137 {
138 send_packet_printf ("drawinfo %d input buffer overflow - closing connection.", NDI_RED | NDI_REPLY);
139 destroy ();
140 return -1;
141 }
142 }
143
144 return 0;
145}
146
147void
148client::skip_packet (int len)
149{
150 inbuf_len -= len;
151 memmove (inbuf, inbuf + len, inbuf_len);
152}
153
84/*********************************************************************** 154/*****************************************************************************
85 * 155 * Start of command dispatch area.
86 * SockList functions/utilities 156 * The commands here are protocol commands.
87 *
88 **********************************************************************/ 157 ****************************************************************************/
89 158
90void 159// SocketCommand, PlayingCommand, should not exist with those ugly casts
91SockList_Init (SockList * sl) 160#define SC(cb) (void *)static_cast<void (*)(char *, int, client *)>(cb),
92{ 161#define PC(cb) (void *)static_cast<void (*)(char *, int, player *)>(cb), PF_PLAYER |
93 sl->len = 0;
94 sl->buf = NULL;
95}
96 162
97void 163/**
98SockList_AddInt (SockList * sl, uint32 data) 164 * Dispatch table for the server.
99{
100 sl->buf[sl->len++] = (data >> 24) & 0xff;
101 sl->buf[sl->len++] = (data >> 16) & 0xff;
102 sl->buf[sl->len++] = (data >> 8) & 0xff;
103 sl->buf[sl->len++] = data & 0xff;
104}
105
106void
107SockList_AddInt64 (SockList * sl, uint64 data)
108{
109 sl->buf[sl->len++] = (char) ((data >> 56) & 0xff);
110 sl->buf[sl->len++] = (char) ((data >> 48) & 0xff);
111 sl->buf[sl->len++] = (char) ((data >> 40) & 0xff);
112 sl->buf[sl->len++] = (char) ((data >> 32) & 0xff);
113
114 sl->buf[sl->len++] = (char) ((data >> 24) & 0xff);
115 sl->buf[sl->len++] = (char) ((data >> 16) & 0xff);
116 sl->buf[sl->len++] = (char) ((data >> 8) & 0xff);
117 sl->buf[sl->len++] = (char) (data & 0xff);
118}
119
120/* Basically does the reverse of SockList_AddInt, but on
121 * strings instead. Same for the GetShort, but for 16 bits.
122 */ 165 */
123int 166static struct packet_type packets[] = {
124GetInt_String (unsigned char *data) 167 {"ncom", PC(NewPlayerCmd) PF_PLAYING | PF_COMMAND6 },
125{ 168 {"command", PC(PlayerCmd) PF_PLAYING | PF_COMMAND0 },
126 return ((data[0] << 24) + (data[1] << 16) + (data[2] << 8) + data[3]);
127}
128 169
129short 170 {"examine", PC(ExamineCmd) PF_PLAYING },
130GetShort_String (unsigned char *data) 171 {"ex", PC(ExCmd) PF_PLAYING },
131{ 172 {"apply", PC(ApplyCmd) PF_PLAYING },
132 return ((data[0] << 8) + data[1]); 173 {"lookat", PC(LookAt) PF_PLAYING },
133} 174 {"lock", PC(LockItem) PF_PLAYING },
175 {"mark", PC(MarkItem) PF_PLAYING },
176 {"move", PC(MoveCmd) PF_PLAYING },
177 {"ext", PC(ExtCmd) 0 }, // CF+
178 {"mapredraw", PC(MapRedrawCmd) 0 },
179 {"mapinfo", PC(MapInfoCmd) 0 }, // CF+
134 180
135/****************************************************************************** 181 {"reply", SC(ReplyCmd) 0 },
136 * 182 {"exti", SC(ExtiCmd) 0 }, // CF+
137 * Start of read routines. 183 {"addme", SC(AddMeCmd) 0 },
138 * 184 {"askface", SC(AskFaceCmd) 0 },
139 ******************************************************************************/ 185 {"requestinfo", SC(RequestInfo) 0 },
186 {"setsound", SC(SetSound) 0 },
187 {"setup", SC(SetUp) 0 },
188 {"version", SC(VersionCmd) 0 },
189 {"toggleextendedtext", SC(ToggleExtendedText) 0 }, /*Added: tchize */
190};
140 191
141/** 192bool
142 * This reads from fd and puts the data in sl. We return true if we think 193client::may_execute (const packet_type *pkt) const
143 * we have a full packet, 0 if we have a partial packet. The only processing
144 * we do is remove the intial size value. len (As passed) is the size of the
145 * buffer allocated in the socklist. We make the assumption the buffer is
146 * at least 2 bytes long.
147 */
148
149int
150SockList_ReadPacket (int fd, SockList * sl, int len)
151{ 194{
152 int stat, toread; 195 return (!(pkt->flags & PF_PLAYER) || pl)
196 && (!(pkt->flags & PF_PLAYING) || state == ST_PLAYING);
197}
153 198
154 /* Sanity check - shouldn't happen */ 199// HACK: some commands currently should be executed
155 if (sl->len < 0) 200// even when the player is frozen. this hack detects
156 { 201// those commands. it should be folded into may_execute,
157 abort (); 202// but kept seperate to emphasise the hack aspect, i.e.
203// do it better, then remove.
204static bool
205always_immediate (const client *ns, const packet_type *pkt, const char *data, int len)
206{
207 if (!(pkt->flags & (PF_COMMAND0 | PF_COMMAND6)))
208 return false;
209
210 if (!ns->pl || !ns->pl->ob || !ns->pl->ob->map)
211 return false;
212
213 if (pkt->flags & PF_COMMAND6)
158 } 214 {
159 /* We already have a partial packet */ 215 data += 6;
160 if (sl->len < 2) 216 len -= 6;
161 { 217 }
162 do 218
219 if (len > 4 && data [ 3] == ' ' && !strncmp (data, "say " , 4)) return true;
220 if (len > 5 && data [ 4] == ' ' && !strncmp (data, "chat " , 5)) return true;
221 if (len > 6 && data [ 5] == ' ' && !strncmp (data, "shout " , 6)) return true;
222 if (len > 8 && data [ 7] == ' ' && !strncmp (data, "suicide " , 8)) return true;
223 if (len > 18 && data [17] == ' ' && !strncmp (data, "accept-invitation ", 18)) return true;
224
225 if (len == 7 && !strcmp (data, "suicide")) return true;
226
227 return false;
228}
229
230void
231client::execute (const packet_type *pkt, char *data, int datalen)
232{
233 if (may_execute (pkt) || always_immediate (this, pkt, data, datalen))
234 {
235 //TODO: only one format
236 if (pkt->flags & PF_PLAYER)
237 ((void (*)(char *, int, player *))pkt->cb)((char *)data, datalen, pl);
238 else
239 ((void (*)(char *, int, client *))pkt->cb)((char *)data, datalen, this);
240 }
241 else
242 send_packet_printf ("drawinfo %d ERROR: you cannot execute '%s' now.", NDI_RED | NDI_REPLY, pkt->name);
243}
244
245bool
246client::handle_packet ()
247{
248 int pkt_len = next_packet ();
249
250 if (!pkt_len)
251 return false;
252 else if (pkt_len < 0)
253 {
254 LOG (llevError, "read error on player %s\n",
255 pl && pl->ob ? &pl->ob->name : "[anonymous]");
256 destroy ();
257 return false;
258 }
259
260 inbuf [pkt_len] = 0; /* Terminate buffer - useful for string data */
261
262 /* First, break out beginning word. There are at least
263 * a few commands that do not have any paremeters. If
264 * we get such a command, don't worry about trying
265 * to break it up.
266 */
267 int datalen;
268 char *data = strchr ((char *)inbuf + 2, ' ');
269
270 if (data)
271 {
272 *data++ = 0;
273 datalen = pkt_len - (data - (char *)inbuf);
274 }
275 else
276 {
277 data = (char *)inbuf + 2; // better read garbage than segfault
278 datalen = 0;
279 }
280
281 for (packet_type *pkt = packets; pkt < packets + (sizeof (packets) / sizeof (packets[0])); ++pkt)
282 if (!strcmp ((char *)inbuf + 2, pkt->name))
163 { 283 {
164 stat = read (fd, sl->buf + sl->len, 2 - sl->len); 284 if (pkt->flags & PF_PLAYER && !always_immediate (this, pkt, data, datalen))
285 queue_command (pkt, data, datalen);
286 else
287 execute (pkt, data, datalen);
288
289 goto next_packet;
290 }
291
292 // If we get here, we didn't find a valid command.
293 send_packet_printf ("drawinfo %d ERROR: command '%s' not supported.", NDI_RED | NDI_REPLY, (char *)inbuf + 2);
294next_packet:
295 skip_packet (pkt_len);
296
297 // input buffer has space again
298 socket_ev.poll (socket_ev.poll () | EV_READ);
299
300 return true;
301}
302
303// callback called when socket is either readable or writable
304void
305client::socket_cb (iow &w, int revents)
306{
307 //TODO remove when we have better socket cleanup logic
308 if (destroyed ())
309 {
310 socket_ev.poll (0);
311 return;
312 }
313
314 if (revents & EV_WRITE)
315 {
316 write_outputbuffer ();
317
318 if (!outputbuffer.len)
319 socket_ev.poll (socket_ev.poll () & ~EV_WRITE);
320 }
321
322 if (revents & EV_READ)
323 {
324 //TODO: rate-limit tcp connection in better ways, important
325
326 int amount = sizeof (inbuf) - inbuf_len;
327
328 if (!amount)
165 } 329 {
166 while ((stat == -1) && (errno == EINTR)); 330 // input buffer full
167 331 socket_ev.poll (socket_ev.poll () & ~EV_READ);
168 if (stat < 0) 332 return;
169 { 333 }
170 /* In non blocking mode, EAGAIN is set when there is no 334
171 * data available. 335 amount = read (fd, inbuf + inbuf_len, amount);
172 */ 336
337 if (!amount)
338 {
339 destroy ();
340 return;
341 }
342 else if (amount < 0)
343 {
173 if (errno != EAGAIN && errno != EWOULDBLOCK) 344 if (errno != EAGAIN && errno != EINTR)
174 { 345 {
175 LOG (llevDebug, "ReadPacket got error %s, returning 0\n", strerror (errno)); 346 LOG (llevError, "read error: %s\n", strerror (errno));
347 destroy ();
348 return;
176 } 349 }
177 return 0; /*Error */
178 }
179 if (stat == 0)
180 return -1;
181 sl->len += stat;
182#ifdef CS_LOGSTATS
183 cst_tot.ibytes += stat;
184 cst_lst.ibytes += stat;
185#endif
186 if (stat < 2)
187 return 0; /* Still don't have a full packet */
188 }
189 /* Figure out how much more data we need to read. Add 2 from the
190 * end of this - size header information is not included.
191 */
192 toread = 2 + (sl->buf[0] << 8) + sl->buf[1] - sl->len;
193 if ((toread + sl->len) >= len)
194 {
195 LOG (llevError, "SockList_ReadPacket: Want to read more bytes than will fit in buffer (%d>=%d).\n", toread + sl->len, len);
196 /* Quick hack in case for 'oldsocketmode' input. If we are
197 * closing the socket anyways, then reading this extra 100 bytes
198 * shouldn't hurt.
199 */
200 read (fd, sl->buf + 2, 100);
201 350
202 /* return error so the socket is closed */ 351 // should not be here, normally
203 return -1;
204 }
205 do
206 {
207 do
208 { 352 }
209 stat = read (fd, sl->buf + sl->len, toread); 353 else
210 } 354 {
211 while ((stat < 0) && (errno == EINTR)); 355 inbuf_len += amount;
212 if (stat < 0)
213 {
214 356
215 if (errno != EAGAIN && errno != EWOULDBLOCK) 357 if (handle_packet ())
216 { 358 {
217 LOG (llevDebug, "ReadPacket got error %s, returning 0\n", strerror (errno)); 359 while (handle_packet ())
360 ;
361
362 flush ();
218 } 363 }
219 return 0; /*Error */
220 }
221 if (stat == 0)
222 return -1;
223 sl->len += stat;
224#ifdef CS_LOGSTATS
225 cst_tot.ibytes += stat;
226 cst_lst.ibytes += stat;
227#endif
228 toread -= stat;
229 if (toread == 0)
230 return 1;
231 if (toread < 0)
232 { 364 }
233 LOG (llevError, "SockList_ReadPacket: Read more bytes than desired.\n");
234 return 1;
235 }
236 } 365 }
237 while (toread > 0);
238 return 0;
239} 366}
240 367
241/******************************************************************************* 368/*******************************************************************************
242 * 369 *
243 * Start of write related routines. 370 * Start of write related routines.
… …
248 * Adds data to a socket buffer for whatever reason. 375 * Adds data to a socket buffer for whatever reason.
249 * 376 *
250 * ns is the socket we are adding the data to, buf is the start of the 377 * ns is the socket we are adding the data to, buf is the start of the
251 * data, and len is the number of bytes to add. 378 * data, and len is the number of bytes to add.
252 */ 379 */
253 380void
254static void 381client::send (void *buf_, int len)
255add_to_buffer (NewSocket * ns, char *buf, int len)
256{ 382{
383 char *buf = (char *)buf_;
384
385 if (destroyed () || !buf)
386 return;
387
388 if (len + outputbuffer.len > SOCKETBUFSIZE)
389 {
390 LOG (llevDebug, "socket on fd %d has overrun internal buffer - marking as dead\n", fd);
391 // shutdown the socket, this is safer than destroying it immediately
392 // as lots of code in the callchain might still access the map etc.
393 shutdown (fd, SHUT_RDWR);
394 return;
395 }
396
257 int avail, end; 397 int avail, end;
258
259 if ((len + ns->outputbuffer.len) > SOCKETBUFSIZE)
260 {
261 LOG (llevDebug, "Socket on fd %d has overrun internal buffer - marking as dead\n", ns->fd);
262 ns->status = Ns_Dead;
263 return;
264 }
265 398
266 /* data + end is where we start putting the new data. The last byte 399 /* data + end is where we start putting the new data. The last byte
267 * currently in use is actually data + end -1 400 * currently in use is actually data + end -1
268 */ 401 */
269
270 end = ns->outputbuffer.start + ns->outputbuffer.len; 402 end = outputbuffer.start + outputbuffer.len;
271 /* The buffer is already in a wrapped state, so adjust end */ 403 /* The buffer is already in a wrapped state, so adjust end */
272 if (end >= SOCKETBUFSIZE) 404 if (end >= SOCKETBUFSIZE)
273 end -= SOCKETBUFSIZE; 405 end -= SOCKETBUFSIZE;
274 406
275 avail = SOCKETBUFSIZE - end; 407 avail = SOCKETBUFSIZE - end;
276 408
277 /* We can all fit it behind the current data without wrapping */ 409 /* We can all fit it behind the current data without wrapping */
278 if (avail >= len) 410 if (avail >= len)
279 memcpy (ns->outputbuffer.data + end, buf, len); 411 memcpy (outputbuffer.data + end, buf, len);
280 else 412 else
281 { 413 {
282 memcpy (ns->outputbuffer.data + end, buf, avail); 414 memcpy (outputbuffer.data + end, buf, avail);
283 memcpy (ns->outputbuffer.data, buf + avail, len - avail); 415 memcpy (outputbuffer.data, buf + avail, len - avail);
284 } 416 }
285 417
286 ns->outputbuffer.len += len; 418 outputbuffer.len += len;
287#if 0
288 LOG (llevDebug, "Added %d to output buffer, total length now %d, start=%d\n", len, ns->outputbuffer.len, ns->outputbuffer.start);
289#endif
290} 419}
291
292/**
293 * Writes data to socket.
294 *
295 * When the socket is clear to write, and we have backlogged data, this
296 * is called to write it out.
297 */
298void
299write_socket_buffer (NewSocket * ns)
300{
301 int amt, max;
302
303 if (ns->outputbuffer.len == 0)
304 {
305 LOG (llevDebug, "write_socket_buffer called when there is no data, fd=%d\n", ns->fd);
306 return;
307 }
308
309 do
310 {
311 max = SOCKETBUFSIZE - ns->outputbuffer.start;
312 if (ns->outputbuffer.len < max)
313 max = ns->outputbuffer.len;
314
315 do
316 {
317 amt = write (ns->fd, ns->outputbuffer.data + ns->outputbuffer.start, max);
318 }
319 while ((amt < 0) && (errno == EINTR));
320
321 if (amt < 0)
322 { /* We got an error */
323
324 if (errno != EWOULDBLOCK)
325 {
326 LOG (llevError, "New socket write failed (wsb) (%d: %s).\n", errno, strerror (errno));
327 ns->status = Ns_Dead;
328 return;
329 }
330 else
331 { /* EWOULDBLOCK */
332 /* can't write it, so store it away. */
333 ns->can_write = 0;
334 return;
335 }
336 }
337 ns->outputbuffer.start += amt;
338 /* wrap back to start of buffer */
339 if (ns->outputbuffer.start == SOCKETBUFSIZE)
340 ns->outputbuffer.start = 0;
341 ns->outputbuffer.len -= amt;
342#ifdef CS_LOGSTATS
343 cst_tot.obytes += amt;
344 cst_lst.obytes += amt;
345#endif
346 }
347 while (ns->outputbuffer.len > 0);
348}
349
350/**
351 * This writes data to the socket. - It is very low level -
352 * all we try and do is write out the data to the socket
353 * provided (ns). buf is the data to write, len is the number
354 * of bytes to write. IT doesn't return anything - rather, it
355 * updates the ns structure if we get an error.
356 */
357void
358Write_To_Socket (NewSocket * ns, char *buf, int len)
359{
360 int amt = 0;
361 char *pos = buf;
362
363 if (ns->status == Ns_Dead || !buf)
364 {
365 LOG (llevDebug, "Write_To_Socket called with dead socket\n");
366 return;
367 }
368
369#ifndef __GNU__ /* This caused problems on Hurd */
370 if (!ns->can_write)
371 {
372 add_to_buffer (ns, buf, len);
373 return;
374 }
375#endif
376 /* If we manage to write more than we wanted, take it as a bonus */
377 while (len > 0)
378 {
379
380 do
381 {
382 amt = write (ns->fd, pos, len);
383 }
384 while ((amt < 0) && (errno == EINTR));
385
386 if (amt < 0)
387 { /* We got an error */
388 if (errno != EWOULDBLOCK)
389 {
390 LOG (llevError, "New socket write failed WTS (%d: %s).\n", /* ---WIN32 */
391 errno, strerror (errno));
392 ns->status = Ns_Dead;
393 return;
394 }
395 else
396 { /* EWOULDBLOCK */
397 /* can't write it, so store it away. */
398 add_to_buffer (ns, pos, len);
399 ns->can_write = 0;
400 return;
401 }
402 }
403 /* amt gets set to 0 above in blocking code, so we do this as
404 * an else if to make sure we don't reprocess it.
405 */
406 else if (amt == 0)
407 {
408 LOG (llevError, "Write_To_Socket: No data written out.\n");
409 }
410 len -= amt;
411 pos += amt;
412#ifdef CS_LOGSTATS
413 cst_tot.obytes += amt;
414 cst_lst.obytes += amt;
415#endif
416 }
417}
418
419 420
420/** 421/**
421 * Takes a string of data, and writes it out to the socket. A very handy 422 * Takes a string of data, and writes it out to the socket. A very handy
422 * shortcut function. 423 * shortcut function.
423 */ 424 */
424void 425void
425cs_write_string (NewSocket * ns, const char *buf, int len) 426client::send_packet (packet &sl)
426{ 427{
427 SockList sl; 428 if (destroyed ())
428
429 sl.len = len;
430 sl.buf = (unsigned char *) buf;
431 Send_With_Handling (ns, &sl);
432}
433
434
435/**
436 * Calls Write_To_Socket to send data to the client.
437 *
438 * The only difference in this function is that we take a SockList
439 *, and we prepend the length information.
440 */
441void
442Send_With_Handling (NewSocket * ns, SockList * msg)
443{
444 unsigned char sbuf[4];
445
446 if (ns->status == Ns_Dead || !msg)
447 return; 429 return;
448 430
449 if (msg->len >= MAXSOCKBUF) 431 if (sl.length () > MAXSOCKBUF)
450 { 432 {
451 LOG (llevError, "Trying to send a buffer beyond properly size, len =%d\n", msg->len); 433 LOG (llevError, "Trying to send a buffer beyond properly size, len =%d\n", sl.length ());
452 /* Almost certainly we've overflowed a buffer, so quite now to make 434 /* Almost certainly we've overflowed a buffer, so quit now to make
453 * it easier to debug. 435 * it easier to debug.
454 */ 436 */
455 abort (); 437 abort ();
456 } 438 }
457 sbuf[0] = ((uint32) (msg->len) >> 8) & 0xFF;
458 sbuf[1] = ((uint32) (msg->len)) & 0xFF;
459 if (ns->status != Ns_Old)
460 Write_To_Socket (ns, (char *) sbuf, 2);
461 Write_To_Socket (ns, (char *) msg->buf, msg->len);
462}
463 439
464/** 440 if (!sl.length ())
465 * Takes a string of data, and writes it out to the socket. A very handy
466 * shortcut function.
467 */
468void
469Write_String_To_Socket (NewSocket * ns, char *buf, int len)
470{
471 SockList sl;
472
473 sl.len = len;
474 sl.buf = (unsigned char *) buf;
475 Send_With_Handling (ns, &sl);
476}
477
478
479/******************************************************************************
480 *
481 * statistics logging functions.
482 *
483 ******************************************************************************/
484
485#ifdef CS_LOGSTATS
486
487/* cst_tot is for the life of the server, cst_last is for the last series of
488 * stats
489 */
490CS_Stats cst_tot, cst_lst;
491
492/**
493 * Writes out the gathered stats. We clear cst_lst.
494 */
495void
496write_cs_stats (void)
497{
498 time_t now = time (NULL);
499
500 /* If no connections recently, don't both to log anything */
501 if (cst_lst.ibytes == 0 && cst_lst.obytes == 0)
502 return; 441 return;
503 442
504 /* CSSTAT is put in so scripts can easily find the line */ 443 assert (sl.hdrlen == 2);
505 LOG (llevInfo, "CSSTAT: %.16s tot %d %d %d %d inc %d %d %d %d\n", 444
506 ctime (&now), cst_tot.ibytes, cst_tot.obytes, cst_tot.max_conn, 445 sl.buf_ [0] = sl.length () >> 8;
507 now - cst_tot.time_start, cst_lst.ibytes, cst_lst.obytes, cst_lst.max_conn, now - cst_lst.time_start); 446 sl.buf_ [1] = sl.length () ;
508 cst_lst.ibytes = 0; 447
509 cst_lst.obytes = 0; 448 send (sl.buf_, sl.length () + sl.hdrlen);
510 cst_lst.max_conn = socket_info.nconns;
511 cst_lst.time_start = now;
512} 449}
513#endif 450
451void
452client::send_packet (const char *buf, int len)
453{
454 packet sl;
455
456 sl << data (buf, len);
457 send_packet (sl);
458}
459
460void
461client::send_packet (const char *buf)
462{
463 send_packet (buf, strlen (buf));
464}
465
466void
467client::send_packet_printf (const char *format, ...)
468{
469 packet sl;
470
471 va_list ap;
472 va_start (ap, format);
473 sl.vprintf (format, ap);
474 va_end (ap);
475
476 send_packet (sl);
477}
478
479void
480client::send_msg (int color, const char *type, const char *msg)
481{
482 if (!msg || !type) // it can happen (for example, missing attack messages cause this)
483 {
484 LOG (logBacktrace | llevError, "send_msg(%d,%p,%p) called with NULL msg or type.\n", color, type, msg);
485 return;
486 }
487
488 int len = strlen (msg);
489
490 if (!(color & NDI_VERBATIM)
491 && (msg_is_special (msg)
492 || (type [0] == 'c' && type [1] == '/') || len > (MAXSOCKBUF - 128)))
493 cfperl_send_msg (this, color, type, msg);
494 else
495 send_packet_printf ("msg %d %s %s", color & NDI_CLIENT_MASK, type, msg);
496}
497
498void
499client::send_drawinfo (const char *msg, int flags)
500{
501 send_msg (flags, "log", msg);
502}
503
504/***********************************************************************
505 *
506 * packet functions/utilities
507 *
508 **********************************************************************/
509
510packet::packet (const char *name)
511{
512 reset ();
513
514 int len = strlen (name);
515 memcpy (cur, name, len); cur += len;
516 *cur++ = ' ';
517}
518
519packet &packet::operator <<(const ber32 v)
520{
521 enum { maxlen = 32 / 7 + 1};
522 uint8 buf[maxlen];
523 uint8 *p = buf + maxlen;
524 uint32 val = v.val;
525
526 *--p = val & 0x7F;
527
528 while (val > 0x7F)
529 {
530 val >>= 7;
531 *--p = (val & 0x7F) | 0x80;
532 }
533
534 return *this << data (p, buf + maxlen - p);
535}
536
537packet &packet::operator <<(const data &v)
538{
539 if (room () < v.len)
540 reset ();
541 else
542 {
543 if (v.len)
544 {
545 memcpy (cur, v.ptr, v.len);
546 cur += v.len;
547 }
548 }
549
550 return *this;
551}
552
553packet &packet::operator <<(const data8 &v)
554{
555 unsigned int len = min (v.len, 0x00FF);
556 return *this << uint8 (len) << data (v.ptr, len);
557}
558
559packet &packet::operator <<(const data16 &v)
560{
561 unsigned int len = min (v.len, 0xFFFF);
562 return *this << uint16 (len) << data (v.ptr, len);
563}
564
565packet &packet::operator <<(const char *v)
566{
567 return *this << data (v, strlen (v ? v : 0));
568}
569
570void
571packet::vprintf (const char *format, va_list ap)
572{
573 int size = room ();
574
575 int len = vsnprintf ((char *)cur, size, format, ap);
576
577 if (len >= size)
578 return reset ();
579
580 cur += len;
581}
582

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