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Comparing deliantra/server/socket/lowlevel.C (file contents):
Revision 1.11 by root, Wed Dec 13 21:27:09 2006 UTC vs.
Revision 1.34 by pippijn, Thu Mar 1 12:28:17 2007 UTC

1/* 1/*
2 CrossFire, A Multiplayer game for X-windows 2 * CrossFire, A Multiplayer game for X-windows
3 3 *
4 * Copyright (C) 2005, 2006, 2007 Marc Lehmann & Crossfire+ Development Team
4 Copyright (C) 1992 Frank Tore Johansen 5 * Copyright (C) 1992 Frank Tore Johansen
5 6 *
6 This program is free software; you can redistribute it and/or modify 7 * This program is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by 8 * it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2 of the License, or 9 * the Free Software Foundation; either version 2 of the License, or
9 (at your option) any later version. 10 * (at your 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 GNU General Public License
17 along with this program; if not, write to the Free Software 18 * along with this program; if not, write to the Free Software
18 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. 19 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
19 20 *
20 The author can be reached via e-mail to mark@pyramid.com 21 * The author can be reached via e-mail to mark@pyramid.com
21*/ 22 */
22 23
23/** 24/**
24 * \file 25 * \file
25 * Low-level socket-related functions. 26 * Low-level socket-related functions.
26 * 27 *
27 * \date 2003-12-02 28 * \date 2003-12-02
… …
33 */ 34 */
34 35
35using namespace std; 36using namespace std;
36 37
37#include <global.h> 38#include <global.h>
38#include <newclient.h>
39#include <sproto.h> 39#include <sproto.h>
40#include <cstdarg> 40#include <cstdarg>
41 41
42#ifdef __linux__ 42#ifdef __linux__
43# include <sys/types.h> 43# include <sys/types.h>
44# include <sys/socket.h> 44# include <sys/socket.h>
45# include <netinet/in.h> 45# include <netinet/in.h>
46# define TCP_HZ 1000 // sorry...
47# include <netinet/tcp.h> 46# include <netinet/tcp.h>
48#endif 47#endif
49 48
50// use a really low timeout, as it doesn't cost any bandwidth, and you can 49// use a really low timeout, as it doesn't cost any bandwidth, and you can
51// easily die in 20 seconds... 50// easily die in 20 seconds...
52#define SOCKET_TIMEOUT1 10 51#define SOCKET_TIMEOUT1 10 * 1000
53#define SOCKET_TIMEOUT2 20 52#define SOCKET_TIMEOUT2 20 * 1000
54 53
55void 54void
56Socket_Flush (NewSocket * ns) 55client::flush ()
57{ 56{
57 if (destroyed ())
58 return;
59
58#ifdef __linux__ 60#ifdef __linux__
59 // check time of last ack, and, if too old, kill connection 61 // check time of last ack, and, if too old, kill connection
60 struct tcp_info tcpi; 62 struct tcp_info tcpi;
61 socklen_t len = sizeof (tcpi); 63 socklen_t len = sizeof (tcpi);
62 64
63 if (!getsockopt (ns->fd, IPPROTO_TCP, TCP_INFO, &tcpi, &len) && len == sizeof (tcpi)) 65 if (!getsockopt (fd, IPPROTO_TCP, TCP_INFO, &tcpi, &len) && len == sizeof (tcpi))
64 { 66 {
65 unsigned int diff = tcpi.tcpi_last_ack_recv - tcpi.tcpi_last_data_sent; 67 unsigned int diff = tcpi.tcpi_last_ack_recv - tcpi.tcpi_last_data_sent;
66 68
69 rtt = tcpi.tcpi_rtt;
70 rttvar = tcpi.tcpi_rttvar;
71
67 if (tcpi.tcpi_unacked && SOCKET_TIMEOUT1 * TCP_HZ < diff && diff < 0x80000000UL // ack delayed for 20s 72 if (tcpi.tcpi_unacked && SOCKET_TIMEOUT1 < diff && diff < 0x80000000UL // ack delayed for 20s
68 && SOCKET_TIMEOUT2 * TCP_HZ < tcpi.tcpi_last_data_sent) // no data sent for 10s 73 && SOCKET_TIMEOUT2 < tcpi.tcpi_last_data_sent) // no data sent for 10s
69 { 74 {
70 LOG (llevDebug, "Connection on fd %d closed due to ack timeout (%u/%u/%u)\n", ns->fd, 75 LOG (llevDebug, "Connection on fd %d closed due to ack timeout (%u/%u/%u)\n", fd,
71 (unsigned) tcpi.tcpi_last_ack_recv, (unsigned) tcpi.tcpi_last_data_sent, (unsigned) tcpi.tcpi_unacked); 76 (unsigned) tcpi.tcpi_last_ack_recv, (unsigned) tcpi.tcpi_last_data_sent, (unsigned) tcpi.tcpi_unacked);
72 ns->status = Ns_Dead; 77 destroy ();
73 } 78 }
74 } 79 }
75
76 int val;
77
78 val = 0; setsockopt (ns->fd, IPPROTO_TCP, TCP_CORK, &val, sizeof (val));
79 val = 1; setsockopt (ns->fd, IPPROTO_TCP, TCP_CORK, &val, sizeof (val));
80#endif 80#endif
81}
82 81
82 /**
83 * Writes data to socket.
84 *
85 * When the socket is clear to write, and we have backlogged data, this
86 * is called to write it out.
87 */
88
89 if (!outputbuffer.len || socket_ev.poll () & PE_W)
90 return;
91
92 write_outputbuffer ();
93}
94
95void
96client::write_outputbuffer ()
97{
98 while (outputbuffer.len)
99 {
100 int res = write (fd, outputbuffer.data + outputbuffer.start,
101 min (outputbuffer.len, SOCKETBUFSIZE - outputbuffer.start));
102
103 if (res > 0)
104 {
105 outputbuffer.start += res;
106 /* wrap back to start of buffer */
107 if (outputbuffer.start == SOCKETBUFSIZE)
108 outputbuffer.start = 0;
109
110 outputbuffer.len -= res;
111#ifdef CS_LOGSTATS
112 cst_tot.obytes += res;
113 cst_lst.obytes += res;
114#endif
115 }
116 else if (res == 0)
117 {
118 LOG (llevError, "socket write failed, connection closed.\n");
119 destroy ();
120 return;
121 }
122 else if (errno == EINTR)
123 {
124 // just retry
125 }
126 else if (errno == EAGAIN)
127 {
128 // delay till ready
129 socket_ev.poll (socket_ev.poll () | PE_W);
130 socket_ev.start ();
131 return;
132 }
133 else
134 {
135 LOG (llevError, "socket write failed: %s\n", strerror (errno));
136 destroy ();
137 return;
138 }
139 }
140
141 socket_ev.poll (socket_ev.poll () & ~PE_W);
142}
143
144/******************************************************************************
145 *
146 * Start of read routines.
147 *
148 ******************************************************************************/
149
150int
151client::next_packet ()
152{
153 if (inbuf_len >= 2)
154 {
155 int pkt_len = (inbuf [0] << 8) | inbuf [1];
156
157 if (inbuf_len >= 2 + pkt_len)
158 return 2 + pkt_len;
159
160 if (inbuf_len == sizeof (inbuf))
161 {
162 send_packet_printf ("drawinfo %d input buffer overflow - closing connection.", NDI_RED);
163 destroy ();
164 return -1;
165 }
166 }
167
168 return 0;
169}
170
171void
172client::skip_packet (int len)
173{
174 inbuf_len -= len;
175 memmove (inbuf, inbuf + len, inbuf_len);
176}
177
83/*********************************************************************** 178/*****************************************************************************
84 * 179 * Start of command dispatch area.
85 * SockList functions/utilities 180 * The commands here are protocol commands.
86 *
87 **********************************************************************/ 181 ****************************************************************************/
88 182
89SockList &SockList::operator <<(const data &v) 183// SocketCommand, PlayingCommand, should not exist with those ugly casts
90{ 184#define SC(cb) (void *)static_cast<void (*)(char *, int, client *)>(cb),
91 if (v.len) 185#define PC(cb) (void *)static_cast<void (*)(char *, int, player *)>(cb), PF_PLAYER |
92 {
93 memcpy (buf + len, v.ptr, v.len);
94 len += v.len;
95 }
96 186
97 return *this; 187/**
98} 188 * Dispatch table for the server.
99
100SockList &SockList::operator <<(const data8 &v)
101{
102 unsigned int len = min (v.len, 0x00FF);
103 return *this << uint8 (len) << data (v.ptr, len);
104}
105
106SockList &SockList::operator <<(const data16 &v)
107{
108 unsigned int len = min (v.len, 0xFFFF);
109 return *this << uint16 (len) << data (v.ptr, len);
110}
111
112SockList &SockList::operator <<(const char *v)
113{
114 return *this << data (v, strlen (v ? v : 0));
115}
116
117void
118SockList::printf (const char *format, ...)
119{
120 va_list ap;
121 va_start (ap, format);
122
123 len += vsprintf ((char *)buf + len, format, ap);
124
125 va_end (ap);
126}
127
128/* Basically does the reverse of SockList_AddInt, but on
129 * strings instead. Same for the GetShort, but for 16 bits.
130 */ 189 */
131int 190static struct packet_type packets[] = {
132GetInt_String (unsigned char *data) 191 {"ncom", PC(NewPlayerCmd) PF_PLAYING | PF_COMMAND6 },
133{ 192 {"command", PC(PlayerCmd) PF_PLAYING | PF_COMMAND0 },
134 return ((data[0] << 24) + (data[1] << 16) + (data[2] << 8) + data[3]);
135}
136 193
137short 194 {"examine", PC(ExamineCmd) PF_PLAYING },
138GetShort_String (unsigned char *data) 195 {"apply", PC(ApplyCmd) PF_PLAYING },
139{ 196 {"lookat", PC(LookAt) PF_PLAYING },
140 return ((data[0] << 8) + data[1]); 197 {"lock", PC(LockItem) PF_PLAYING },
141} 198 {"mark", PC(MarkItem) PF_PLAYING },
199 {"move", PC(MoveCmd) PF_PLAYING },
200 {"ext", PC(ExtCmd) 0 }, /* CF+ */
201 {"mapredraw", PC(MapRedrawCmd) 0 }, /* Added: phil */
202 {"mapinfo", PC(MapInfoCmd) 0 }, /* CF+ */
142 203
143/****************************************************************************** 204 {"reply", SC(ReplyCmd) 0 },
144 * 205 {"exti", SC(ExtiCmd) 0 }, /* CF+ */
145 * Start of read routines. 206 {"addme", SC(AddMeCmd) 0 },
146 * 207 {"askface", SC(SendFaceCmd) 0 }, /* Added: phil */
147 ******************************************************************************/ 208 {"requestinfo", SC(RequestInfo) 0 },
209 {"setfacemode", SC(SetFaceMode) 0 },
210 {"setsound", SC(SetSound) 0 },
211 {"setup", SC(SetUp) 0 },
212 {"version", SC(VersionCmd) 0 },
213 {"toggleextendedinfos", SC(ToggleExtendedInfos) 0 }, /*Added: tchize */
214 {"toggleextendedtext", SC(ToggleExtendedText) 0 }, /*Added: tchize */
215 {"asksmooth", SC(AskSmooth) 0 }, /*Added: tchize (smoothing technologies) */
216};
148 217
149/** 218bool
150 * This reads from fd and puts the data in sl. We return true if we think 219client::may_execute (const packet_type *pkt) const
151 * we have a full packet, 0 if we have a partial packet. The only processing
152 * we do is remove the intial size value. len (As passed) is the size of the
153 * buffer allocated in the socklist. We make the assumption the buffer is
154 * at least 2 bytes long.
155 */
156
157int
158SockList_ReadPacket (int fd, SockList *sl, int len)
159{ 220{
160 int stat, toread; 221 return (!(pkt->flags & PF_PLAYER) || pl)
222 && (!(pkt->flags & PF_PLAYING) || state == ST_PLAYING);
223}
161 224
162 /* Sanity check - shouldn't happen */ 225// HACK: some commands currently should be executed
163 if (sl->len < 0) 226// even when the player is frozen. this hack detects
164 { 227// those commands. it should be folded into may_execute,
165 abort (); 228// but kept seperate to emphasise the hack aspect, i.e.
229// do it better, then remove.
230static bool
231always_immediate (const client *ns, const packet_type *pkt, const char *data, int len)
232{
233 if (!(pkt->flags & (PF_COMMAND0 | PF_COMMAND6)))
234 return false;
235
236 if (!ns->pl || !ns->pl->ob || !ns->pl->ob->map)
237 return false;
238
239 if (pkt->flags & PF_COMMAND6)
166 } 240 {
167 /* We already have a partial packet */ 241 data += 6;
168 if (sl->len < 2) 242 len -= 6;
169 { 243 }
170 do 244
245 if (len > 4 && !strncmp (data, "say " , 4))
246 return true;
247 if (len > 5 && !strncmp (data, "chat ", 5))
248 return true;
249
250 return false;
251}
252
253void
254client::execute (const packet_type *pkt, char *data, int datalen)
255{
256 if (may_execute (pkt) || always_immediate (this, pkt, data, datalen))
257 {
258 //TODO: only one format
259 if (pkt->flags & PF_PLAYER)
260 ((void (*)(char *, int, player *))pkt->cb)((char *)data, datalen, pl);
261 else
262 ((void (*)(char *, int, client *))pkt->cb)((char *)data, datalen, this);
263 }
264 else
265 send_packet_printf ("drawinfo %d ERROR: you cannot execute '%s' now.", NDI_RED, pkt->name);
266}
267
268bool
269client::handle_packet ()
270{
271 int pkt_len = next_packet ();
272
273 if (!pkt_len)
274 return false;
275 else if (pkt_len < 0)
276 {
277 LOG (llevError, "read error on player %s\n",
278 pl && pl->ob ? &pl->ob->name : "[anonymous]");
279 destroy ();
280 return false;
281 }
282
283 inbuf [pkt_len] = 0; /* Terminate buffer - useful for string data */
284
285 /* First, break out beginning word. There are at least
286 * a few commands that do not have any paremeters. If
287 * we get such a command, don't worry about trying
288 * to break it up.
289 */
290 int datalen;
291 char *data = strchr ((char *)inbuf + 2, ' ');
292
293 if (data)
294 {
295 *data++ = 0;
296 datalen = pkt_len - (data - (char *)inbuf);
297 }
298 else
299 {
300 data = (char *)inbuf + 2; // better read garbage than segfault
301 datalen = 0;
302 }
303
304 for (packet_type *pkt = packets; pkt < packets + (sizeof (packets) / sizeof (packets[0])); ++pkt)
305 if (!strcmp ((char *)inbuf + 2, pkt->name))
171 { 306 {
172 stat = read (fd, sl->buf + sl->len, 2 - sl->len); 307 if (pkt->flags & PF_PLAYER && !always_immediate (this, pkt, data, datalen))
308 queue_command (pkt, data, datalen);
309 else
310 execute (pkt, data, datalen);
311
312 goto next_packet;
313 }
314
315 // If we get here, we didn't find a valid command.
316 send_packet_printf ("drawinfo %d ERROR: command '%s' not supported.", NDI_RED, (char *)inbuf + 2);
317next_packet:
318 skip_packet (pkt_len);
319
320 // input buffer has space again
321 socket_ev.poll (socket_ev.poll () | PE_R);
322
323 return true;
324}
325
326// callback called when socket is either readable or writable
327void
328client::socket_cb (iow &w, int got)
329{
330 //TODO remove when we have better socket cleanup logic
331 if (destroyed ())
332 {
333 socket_ev.poll (0);
334 return;
335 }
336
337 if (got & PE_W)
338 {
339 write_outputbuffer ();
340
341 if (!outputbuffer.len)
342 socket_ev.poll (socket_ev.poll () & ~PE_W);
343 }
344
345 if (got & PE_R)
346 {
347 //TODO: rate-limit tcp connection in better ways, important
348
349 int amount = sizeof (inbuf) - inbuf_len;
350
351 if (!amount)
173 } 352 {
174 while ((stat == -1) && (errno == EINTR)); 353 // input buffer full
175 354 socket_ev.poll (socket_ev.poll () & ~PE_R);
176 if (stat < 0) 355 return;
177 { 356 }
178 /* In non blocking mode, EAGAIN is set when there is no 357
179 * data available. 358 amount = read (fd, inbuf + inbuf_len, amount);
180 */ 359
360 if (!amount)
361 {
362 destroy ();
363 return;
364 }
365 else if (amount < 0)
366 {
181 if (errno != EAGAIN && errno != EWOULDBLOCK) 367 if (errno != EAGAIN && errno != EINTR)
182 { 368 {
183 LOG (llevDebug, "ReadPacket got error %s, returning 0\n", strerror (errno)); 369 LOG (llevError, "read error: %s\n", strerror (errno));
370 destroy ();
371 return;
184 } 372 }
185 return 0; /*Error */
186 }
187 if (stat == 0)
188 return -1;
189 sl->len += stat;
190#ifdef CS_LOGSTATS
191 cst_tot.ibytes += stat;
192 cst_lst.ibytes += stat;
193#endif
194 if (stat < 2)
195 return 0; /* Still don't have a full packet */
196 }
197 /* Figure out how much more data we need to read. Add 2 from the
198 * end of this - size header information is not included.
199 */
200 toread = 2 + (sl->buf[0] << 8) + sl->buf[1] - sl->len;
201 if ((toread + sl->len) >= len)
202 {
203 LOG (llevError, "SockList_ReadPacket: Want to read more bytes than will fit in buffer (%d>=%d).\n", toread + sl->len, len);
204 /* Quick hack in case for 'oldsocketmode' input. If we are
205 * closing the socket anyways, then reading this extra 100 bytes
206 * shouldn't hurt.
207 */
208 read (fd, sl->buf + 2, 100);
209 373
210 /* return error so the socket is closed */ 374 // should not be here, normally
211 return -1;
212 }
213 do
214 {
215 do
216 { 375 }
217 stat = read (fd, sl->buf + sl->len, toread); 376 else
218 } 377 {
219 while ((stat < 0) && (errno == EINTR)); 378 inbuf_len += amount;
220 if (stat < 0) 379
380 cst_tot.ibytes += amount;
381 cst_lst.ibytes += amount;
382
383 cmd_ev.start ();
221 { 384 }
222
223 if (errno != EAGAIN && errno != EWOULDBLOCK)
224 {
225 LOG (llevDebug, "ReadPacket got error %s, returning 0\n", strerror (errno));
226 }
227 return 0; /*Error */
228 }
229 if (stat == 0)
230 return -1;
231 sl->len += stat;
232#ifdef CS_LOGSTATS
233 cst_tot.ibytes += stat;
234 cst_lst.ibytes += stat;
235#endif
236 toread -= stat;
237 if (toread == 0)
238 return 1;
239 if (toread < 0)
240 {
241 LOG (llevError, "SockList_ReadPacket: Read more bytes than desired.\n");
242 return 1;
243 }
244 } 385 }
245 while (toread > 0); 386}
246 return 0; 387
388// called whenever we have additional commands to process
389void
390client::cmd_cb (iw &w)
391{
392 if (handle_packet ())
393 w.start ();
394 else
395 flush ();
247} 396}
248 397
249/******************************************************************************* 398/*******************************************************************************
250 * 399 *
251 * Start of write related routines. 400 * Start of write related routines.
… …
256 * Adds data to a socket buffer for whatever reason. 405 * Adds data to a socket buffer for whatever reason.
257 * 406 *
258 * ns is the socket we are adding the data to, buf is the start of the 407 * ns is the socket we are adding the data to, buf is the start of the
259 * data, and len is the number of bytes to add. 408 * data, and len is the number of bytes to add.
260 */ 409 */
261 410void
262static void 411client::send (void *buf_, int len)
263add_to_buffer (NewSocket * ns, char *buf, int len)
264{ 412{
413 char *buf = (char *)buf_;
414
415 if (destroyed () || !buf)
416 return;
417
418 if (len + outputbuffer.len > SOCKETBUFSIZE)
419 {
420 LOG (llevDebug, "socket on fd %d has overrun internal buffer - marking as dead\n", fd);
421 destroy ();
422 return;
423 }
424
265 int avail, end; 425 int avail, end;
266
267 if ((len + ns->outputbuffer.len) > SOCKETBUFSIZE)
268 {
269 LOG (llevDebug, "Socket on fd %d has overrun internal buffer - marking as dead\n", ns->fd);
270 ns->status = Ns_Dead;
271 return;
272 }
273 426
274 /* data + end is where we start putting the new data. The last byte 427 /* data + end is where we start putting the new data. The last byte
275 * currently in use is actually data + end -1 428 * currently in use is actually data + end -1
276 */ 429 */
277
278 end = ns->outputbuffer.start + ns->outputbuffer.len; 430 end = outputbuffer.start + outputbuffer.len;
279 /* The buffer is already in a wrapped state, so adjust end */ 431 /* The buffer is already in a wrapped state, so adjust end */
280 if (end >= SOCKETBUFSIZE) 432 if (end >= SOCKETBUFSIZE)
281 end -= SOCKETBUFSIZE; 433 end -= SOCKETBUFSIZE;
282 434
283 avail = SOCKETBUFSIZE - end; 435 avail = SOCKETBUFSIZE - end;
284 436
285 /* We can all fit it behind the current data without wrapping */ 437 /* We can all fit it behind the current data without wrapping */
286 if (avail >= len) 438 if (avail >= len)
287 memcpy (ns->outputbuffer.data + end, buf, len); 439 memcpy (outputbuffer.data + end, buf, len);
288 else 440 else
289 { 441 {
290 memcpy (ns->outputbuffer.data + end, buf, avail); 442 memcpy (outputbuffer.data + end, buf, avail);
291 memcpy (ns->outputbuffer.data, buf + avail, len - avail); 443 memcpy (outputbuffer.data, buf + avail, len - avail);
292 } 444 }
293 445
294 ns->outputbuffer.len += len; 446 outputbuffer.len += len;
295#if 0
296 LOG (llevDebug, "Added %d to output buffer, total length now %d, start=%d\n", len, ns->outputbuffer.len, ns->outputbuffer.start);
297#endif
298} 447}
299
300/**
301 * Writes data to socket.
302 *
303 * When the socket is clear to write, and we have backlogged data, this
304 * is called to write it out.
305 */
306void
307write_socket_buffer (NewSocket * ns)
308{
309 int amt, max;
310
311 if (ns->outputbuffer.len == 0)
312 {
313 LOG (llevDebug, "write_socket_buffer called when there is no data, fd=%d\n", ns->fd);
314 return;
315 }
316
317 do
318 {
319 max = SOCKETBUFSIZE - ns->outputbuffer.start;
320 if (ns->outputbuffer.len < max)
321 max = ns->outputbuffer.len;
322
323 do
324 {
325 amt = write (ns->fd, ns->outputbuffer.data + ns->outputbuffer.start, max);
326 }
327 while ((amt < 0) && (errno == EINTR));
328
329 if (amt < 0)
330 { /* We got an error */
331
332 if (errno != EWOULDBLOCK)
333 {
334 LOG (llevError, "New socket write failed (wsb) (%d: %s).\n", errno, strerror (errno));
335 ns->status = Ns_Dead;
336 return;
337 }
338 else
339 { /* EWOULDBLOCK */
340 /* can't write it, so store it away. */
341 ns->can_write = 0;
342 return;
343 }
344 }
345 ns->outputbuffer.start += amt;
346 /* wrap back to start of buffer */
347 if (ns->outputbuffer.start == SOCKETBUFSIZE)
348 ns->outputbuffer.start = 0;
349 ns->outputbuffer.len -= amt;
350#ifdef CS_LOGSTATS
351 cst_tot.obytes += amt;
352 cst_lst.obytes += amt;
353#endif
354 }
355 while (ns->outputbuffer.len > 0);
356}
357
358/**
359 * This writes data to the socket. - It is very low level -
360 * all we try and do is write out the data to the socket
361 * provided (ns). buf is the data to write, len is the number
362 * of bytes to write. IT doesn't return anything - rather, it
363 * updates the ns structure if we get an error.
364 */
365void
366Write_To_Socket (NewSocket * ns, char *buf, int len)
367{
368 int amt = 0;
369 char *pos = buf;
370
371 if (ns->status == Ns_Dead || !buf)
372 {
373 LOG (llevDebug, "Write_To_Socket called with dead socket\n");
374 return;
375 }
376
377#ifndef __GNU__ /* This caused problems on Hurd */
378 if (!ns->can_write)
379 {
380 add_to_buffer (ns, buf, len);
381 return;
382 }
383#endif
384 /* If we manage to write more than we wanted, take it as a bonus */
385 while (len > 0)
386 {
387
388 do
389 {
390 amt = write (ns->fd, pos, len);
391 }
392 while ((amt < 0) && (errno == EINTR));
393
394 if (amt < 0)
395 { /* We got an error */
396 if (errno != EWOULDBLOCK)
397 {
398 LOG (llevError, "New socket write failed WTS (%d: %s).\n", /* ---WIN32 */
399 errno, strerror (errno));
400 ns->status = Ns_Dead;
401 return;
402 }
403 else
404 { /* EWOULDBLOCK */
405 /* can't write it, so store it away. */
406 add_to_buffer (ns, pos, len);
407 ns->can_write = 0;
408 return;
409 }
410 }
411 /* amt gets set to 0 above in blocking code, so we do this as
412 * an else if to make sure we don't reprocess it.
413 */
414 else if (amt == 0)
415 {
416 LOG (llevError, "Write_To_Socket: No data written out.\n");
417 }
418 len -= amt;
419 pos += amt;
420#ifdef CS_LOGSTATS
421 cst_tot.obytes += amt;
422 cst_lst.obytes += amt;
423#endif
424 }
425}
426
427 448
428/** 449/**
429 * Takes a string of data, and writes it out to the socket. A very handy 450 * Takes a string of data, and writes it out to the socket. A very handy
430 * shortcut function. 451 * shortcut function.
431 */ 452 */
432void 453void
433cs_write_string (NewSocket *ns, const char *buf, int len) 454client::send_packet (packet &sl)
434{ 455{
435 SockList sl; 456 if (destroyed ())
436
437 sl.len = len;
438 sl.buf = (unsigned char *) buf;
439 Send_With_Handling (ns, &sl);
440}
441
442
443/**
444 * Calls Write_To_Socket to send data to the client.
445 *
446 * The only difference in this function is that we take a SockList
447 *, and we prepend the length information.
448 */
449void
450Send_With_Handling (NewSocket *ns, SockList *msg)
451{
452 unsigned char sbuf[4];
453
454 if (ns->status == Ns_Dead || !msg)
455 return; 457 return;
456 458
457 if (msg->len >= MAXSOCKBUF) 459 if (sl.length () >= MAXSOCKBUF)
458 { 460 {
459 LOG (llevError, "Trying to send a buffer beyond properly size, len =%d\n", msg->len); 461 LOG (llevError, "Trying to send a buffer beyond properly size, len =%d\n", sl.length ());
460 /* Almost certainly we've overflowed a buffer, so quite now to make 462 /* Almost certainly we've overflowed a buffer, so quit now to make
461 * it easier to debug. 463 * it easier to debug.
462 */ 464 */
463 abort (); 465 abort ();
464 } 466 }
465 sbuf[0] = ((uint32) (msg->len) >> 8) & 0xFF;
466 sbuf[1] = ((uint32) (msg->len)) & 0xFF;
467 if (ns->status != Ns_Old)
468 Write_To_Socket (ns, (char *) sbuf, 2);
469 Write_To_Socket (ns, (char *) msg->buf, msg->len);
470}
471 467
472/** 468 if (!sl.length ())
473 * Takes a string of data, and writes it out to the socket. A very handy 469 return;
474 * shortcut function. 470
471 assert (sl.hdrlen == 2);
472
473 sl.buf_ [0] = sl.length () >> 8;
474 sl.buf_ [1] = sl.length () ;
475
476 send (sl.buf_, sl.length () + sl.hdrlen);
477}
478
479void
480client::send_packet (const char *buf, int len)
481{
482 packet sl;
483
484 sl << data (buf, len);
485 send_packet (sl);
486}
487
488void
489client::send_packet (const char *buf)
490{
491 send_packet (buf, strlen (buf));
492}
493
494void
495client::send_packet_printf (const char *format, ...)
496{
497 packet sl;
498
499 va_list ap;
500 va_start (ap, format);
501 sl.vprintf (format, ap);
502 va_end (ap);
503
504 send_packet (sl);
505}
506
507/***********************************************************************
475 */ 508 *
476void 509 * packet functions/utilities
477Write_String_To_Socket (NewSocket *ns, char *buf, int len) 510 *
478{ 511 **********************************************************************/
479 SockList sl;
480 512
481 sl.len = len; 513packet::packet (const char *name)
482 sl.buf = (unsigned char *) buf; 514{
483 Send_With_Handling (ns, &sl); 515 reset ();
484}
485 516
517 int len = strlen (name);
518 memcpy (cur, name, len); cur += len;
519 *cur++ = ' ';
520}
521
522packet &packet::operator <<(const data &v)
523{
524 if (room () < v.len)
525 reset ();
526 else
527 {
528 if (v.len)
529 {
530 memcpy (cur, v.ptr, v.len);
531 cur += v.len;
532 }
533 }
534
535 return *this;
536}
537
538packet &packet::operator <<(const data8 &v)
539{
540 unsigned int len = min (v.len, 0x00FF);
541 return *this << uint8 (len) << data (v.ptr, len);
542}
543
544packet &packet::operator <<(const data16 &v)
545{
546 unsigned int len = min (v.len, 0xFFFF);
547 return *this << uint16 (len) << data (v.ptr, len);
548}
549
550packet &packet::operator <<(const char *v)
551{
552 return *this << data (v, strlen (v ? v : 0));
553}
554
555void
556packet::vprintf (const char *format, va_list ap)
557{
558 int size = room ();
559
560 int len = vsnprintf ((char *)cur, size, format, ap);
561
562 if (len >= size)
563 return reset ();
564
565 cur += len;
566}
486 567
487/****************************************************************************** 568/******************************************************************************
488 * 569 *
489 * statistics logging functions. 570 * statistics logging functions.
490 * 571 *
… …
513 LOG (llevInfo, "CSSTAT: %.16s tot %d %d %d %d inc %d %d %d %d\n", 594 LOG (llevInfo, "CSSTAT: %.16s tot %d %d %d %d inc %d %d %d %d\n",
514 ctime (&now), cst_tot.ibytes, cst_tot.obytes, cst_tot.max_conn, 595 ctime (&now), cst_tot.ibytes, cst_tot.obytes, cst_tot.max_conn,
515 now - cst_tot.time_start, cst_lst.ibytes, cst_lst.obytes, cst_lst.max_conn, now - cst_lst.time_start); 596 now - cst_tot.time_start, cst_lst.ibytes, cst_lst.obytes, cst_lst.max_conn, now - cst_lst.time_start);
516 cst_lst.ibytes = 0; 597 cst_lst.ibytes = 0;
517 cst_lst.obytes = 0; 598 cst_lst.obytes = 0;
518 cst_lst.max_conn = socket_info.nconns;
519 cst_lst.time_start = now; 599 cst_lst.time_start = now;
520} 600}
521#endif 601#endif
522 602

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