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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 1.21 by root, Fri Dec 15 00:14:13 2006 UTC

… …
35using namespace std; 35using namespace std;
36 36
37#include <global.h> 37#include <global.h>
38#include <newclient.h> 38#include <newclient.h>
39#include <sproto.h> 39#include <sproto.h>
40#include <cstdarg>
40 41
41#ifdef __linux__ 42#ifdef __linux__
42# include <sys/types.h> 43# include <sys/types.h>
43# include <sys/socket.h> 44# include <sys/socket.h>
44# include <netinet/in.h> 45# include <netinet/in.h>
… …
50// easily die in 20 seconds... 51// easily die in 20 seconds...
51#define SOCKET_TIMEOUT1 10 52#define SOCKET_TIMEOUT1 10
52#define SOCKET_TIMEOUT2 20 53#define SOCKET_TIMEOUT2 20
53 54
54void 55void
55Socket_Flush (NewSocket * ns) 56client_socket::flush ()
56{ 57{
57#ifdef __linux__ 58#ifdef __linux__
58 // check time of last ack, and, if too old, kill connection 59 // check time of last ack, and, if too old, kill connection
59 struct tcp_info tcpi; 60 struct tcp_info tcpi;
60 socklen_t len = sizeof (tcpi); 61 socklen_t len = sizeof (tcpi);
61 62
62 if (!getsockopt (ns->fd, IPPROTO_TCP, TCP_INFO, &tcpi, &len) && len == sizeof (tcpi)) 63 if (!getsockopt (fd, IPPROTO_TCP, TCP_INFO, &tcpi, &len) && len == sizeof (tcpi))
63 { 64 {
64 unsigned int diff = tcpi.tcpi_last_ack_recv - tcpi.tcpi_last_data_sent; 65 unsigned int diff = tcpi.tcpi_last_ack_recv - tcpi.tcpi_last_data_sent;
66
67 rtt = tcpi.tcpi_rtt;
68 rttvar = tcpi.tcpi_rttvar;
65 69
66 if (tcpi.tcpi_unacked && SOCKET_TIMEOUT1 * TCP_HZ < diff && diff < 0x80000000UL // ack delayed for 20s 70 if (tcpi.tcpi_unacked && SOCKET_TIMEOUT1 * TCP_HZ < diff && diff < 0x80000000UL // ack delayed for 20s
67 && SOCKET_TIMEOUT2 * TCP_HZ < tcpi.tcpi_last_data_sent) // no data sent for 10s 71 && SOCKET_TIMEOUT2 * TCP_HZ < tcpi.tcpi_last_data_sent) // no data sent for 10s
68 { 72 {
69 LOG (llevDebug, "Connection on fd %d closed due to ack timeout (%u/%u/%u)\n", ns->fd, 73 LOG (llevDebug, "Connection on fd %d closed due to ack timeout (%u/%u/%u)\n", fd,
70 (unsigned) tcpi.tcpi_last_ack_recv, (unsigned) tcpi.tcpi_last_data_sent, (unsigned) tcpi.tcpi_unacked); 74 (unsigned) tcpi.tcpi_last_ack_recv, (unsigned) tcpi.tcpi_last_data_sent, (unsigned) tcpi.tcpi_unacked);
71 ns->status = Ns_Dead; 75 status = Ns_Dead;
72 } 76 }
73 } 77 }
74
75 int val;
76
77 val = 0;
78 setsockopt (ns->fd, IPPROTO_TCP, TCP_CORK, &val, sizeof (val));
79 val = 1;
80 setsockopt (ns->fd, IPPROTO_TCP, TCP_CORK, &val, sizeof (val));
81#endif 78#endif
79
80 /**
81 * Writes data to socket.
82 *
83 * When the socket is clear to write, and we have backlogged data, this
84 * is called to write it out.
85 */
86
87 if (!outputbuffer.len || socket_ev.poll () & PE_W)
88 return;
89
90 write_outputbuffer ();
91}
92
93void
94client_socket::write_outputbuffer ()
95{
96 while (outputbuffer.len)
97 {
98 int res = write (fd, outputbuffer.data + outputbuffer.start,
99 min (outputbuffer.len, SOCKETBUFSIZE - outputbuffer.start));
100
101 if (res > 0)
102 {
103 outputbuffer.start += res;
104 /* wrap back to start of buffer */
105 if (outputbuffer.start == SOCKETBUFSIZE)
106 outputbuffer.start = 0;
107
108 outputbuffer.len -= res;
109#ifdef CS_LOGSTATS
110 cst_tot.obytes += res;
111 cst_lst.obytes += res;
112#endif
113 }
114 else if (res == 0)
115 {
116 LOG (llevError, "socket write failed, connection closed.\n");
117 status = Ns_Dead;
118 return;
119 }
120 else if (errno == EINTR)
121 {
122 // just retry
123 }
124 else if (errno == EAGAIN)
125 {
126 // delay till ready
127 socket_ev.poll (socket_ev.poll () | PE_W);
128 socket_ev.start ();
129 return;
130 }
131 else
132 {
133 LOG (llevError, "socket write failed: %s\n", strerror (errno));
134 status = Ns_Dead;
135 return;
136 }
137 }
138
139 socket_ev.poll (socket_ev.poll () & ~PE_W);
82} 140}
83 141
84/*********************************************************************** 142/***********************************************************************
85 * 143 *
86 * SockList functions/utilities 144 * packet functions/utilities
87 * 145 *
88 **********************************************************************/ 146 **********************************************************************/
89 147
90void 148packet &packet::operator <<(const data &v)
91SockList_Init (SockList * sl)
92{ 149{
93 sl->len = 0; 150 if (room () < v.len)
94 sl->buf = NULL; 151 reset ();
95} 152 else
153 {
154 if (v.len)
155 {
156 memcpy (cur, v.ptr, v.len);
157 cur += v.len;
158 }
159 }
96 160
97void 161 return *this;
98SockList_AddInt (SockList * sl, uint32 data)
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} 162}
105 163
106void 164packet &packet::operator <<(const data8 &v)
107SockList_AddInt64 (SockList * sl, uint64 data)
108{ 165{
109 sl->buf[sl->len++] = (char) ((data >> 56) & 0xff); 166 unsigned int len = min (v.len, 0x00FF);
110 sl->buf[sl->len++] = (char) ((data >> 48) & 0xff); 167 return *this << uint8 (len) << data (v.ptr, len);
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} 168}
119 169
120/* Basically does the reverse of SockList_AddInt, but on 170packet &packet::operator <<(const data16 &v)
121 * strings instead. Same for the GetShort, but for 16 bits. 171{
172 unsigned int len = min (v.len, 0xFFFF);
173 return *this << uint16 (len) << data (v.ptr, len);
174}
175
176packet &packet::operator <<(const char *v)
177{
178 return *this << data (v, strlen (v ? v : 0));
179}
180
181void
182packet::printf (const char *format, ...)
183{
184 int size = room ();
185
186 va_list ap;
187 va_start (ap, format);
188 int len = vsnprintf ((char *)cur, size, format, ap);
189 va_end (ap);
190
191 if (len >= size)
192 return reset ();
193
194 cur += len;
195}
196
197/******************************************************************************
122 */ 198 *
199 * Start of read routines.
200 *
201 ******************************************************************************/
202
123int 203int
124GetInt_String (unsigned char *data) 204client_socket::read_packet ()
125{ 205{
126 return ((data[0] << 24) + (data[1] << 16) + (data[2] << 8) + data[3]); 206 for (;;)
127}
128
129short
130GetShort_String (unsigned char *data)
131{
132 return ((data[0] << 8) + data[1]);
133}
134
135/******************************************************************************
136 *
137 * Start of read routines.
138 *
139 ******************************************************************************/
140
141/**
142 * This reads from fd and puts the data in sl. We return true if we think
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{
152 int stat, toread;
153
154 /* Sanity check - shouldn't happen */
155 if (sl->len < 0)
156 {
157 abort ();
158 } 207 {
159 /* We already have a partial packet */ 208 if (inbuf_len >= 2)
160 if (sl->len < 2)
161 {
162 do
163 {
164 stat = read (fd, sl->buf + sl->len, 2 - sl->len);
165 } 209 {
166 while ((stat == -1) && (errno == EINTR)); 210 unsigned int pkt_len = (inbuf [0] << 8) | inbuf [1];
167 211
168 if (stat < 0) 212 if (inbuf_len >= 2 + pkt_len)
213 return pkt_len + 2;
169 { 214 }
170 /* In non blocking mode, EAGAIN is set when there is no 215
171 * data available. 216 int amount = sizeof (inbuf) - inbuf_len;
172 */ 217
218 if (amount <= 0)
219 {
220 LOG (llevError, "packet too large");//TODO
221 return -1;
222 }
223
224 amount = read (fd, inbuf + inbuf_len, amount);
225
226 if (!amount)
227 {
228 status = Ns_Dead;
229 return -1;
230 }
231 else if (amount < 0)
232 {
173 if (errno != EAGAIN && errno != EWOULDBLOCK) 233 if (errno != EAGAIN && errno != EINTR)
174 { 234 {
175 LOG (llevDebug, "ReadPacket got error %s, returning 0\n", strerror (errno)); 235 LOG (llevError, "read error: %s\n", strerror (errno));
236 return -1;
176 } 237 }
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);
201 238
202 /* return error so the socket is closed */
203 return -1;
204 }
205 do
206 {
207 do
208 {
209 stat = read (fd, sl->buf + sl->len, toread);
210 }
211 while ((stat < 0) && (errno == EINTR));
212 if (stat < 0)
213 {
214
215 if (errno != EAGAIN && errno != EWOULDBLOCK)
216 {
217 LOG (llevDebug, "ReadPacket got error %s, returning 0\n", strerror (errno));
218 }
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 {
233 LOG (llevError, "SockList_ReadPacket: Read more bytes than desired.\n");
234 return 1; 239 return 0;
235 } 240 }
241
242 inbuf_len += amount;
243
244 cst_tot.ibytes += amount;
245 cst_lst.ibytes += amount;
236 } 246 }
237 while (toread > 0); 247}
238 return 0; 248
249void
250client_socket::skip_packet (int len)
251{
252 inbuf_len -= len;
253 memmove (inbuf, inbuf + len, inbuf_len);
239} 254}
240 255
241/******************************************************************************* 256/*******************************************************************************
242 * 257 *
243 * Start of write related routines. 258 * Start of write related routines.
… …
248 * Adds data to a socket buffer for whatever reason. 263 * Adds data to a socket buffer for whatever reason.
249 * 264 *
250 * ns is the socket we are adding the data to, buf is the start of the 265 * 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. 266 * data, and len is the number of bytes to add.
252 */ 267 */
253 268void
254static void 269client_socket::send (void *buf_, int len)
255add_to_buffer (NewSocket * ns, char *buf, int len)
256{ 270{
271 char *buf = (char *)buf_;
272 char *pos = buf;
273 int amt = 0;
274
275 if (status == Ns_Dead || !buf)
276 {
277 LOG (llevDebug, "Write_To_Socket called with dead socket\n");
278 return;
279 }
280
281 if ((len + outputbuffer.len) > SOCKETBUFSIZE)
282 {
283 LOG (llevDebug, "Socket on fd %d has overrun internal buffer - marking as dead\n", fd);
284 status = Ns_Dead;
285 return;
286 }
287
257 int avail, end; 288 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 }
265 289
266 /* data + end is where we start putting the new data. The last byte 290 /* data + end is where we start putting the new data. The last byte
267 * currently in use is actually data + end -1 291 * currently in use is actually data + end -1
268 */ 292 */
269
270 end = ns->outputbuffer.start + ns->outputbuffer.len; 293 end = outputbuffer.start + outputbuffer.len;
271 /* The buffer is already in a wrapped state, so adjust end */ 294 /* The buffer is already in a wrapped state, so adjust end */
272 if (end >= SOCKETBUFSIZE) 295 if (end >= SOCKETBUFSIZE)
273 end -= SOCKETBUFSIZE; 296 end -= SOCKETBUFSIZE;
274 297
275 avail = SOCKETBUFSIZE - end; 298 avail = SOCKETBUFSIZE - end;
276 299
277 /* We can all fit it behind the current data without wrapping */ 300 /* We can all fit it behind the current data without wrapping */
278 if (avail >= len) 301 if (avail >= len)
279 memcpy (ns->outputbuffer.data + end, buf, len); 302 memcpy (outputbuffer.data + end, buf, len);
280 else 303 else
281 { 304 {
282 memcpy (ns->outputbuffer.data + end, buf, avail); 305 memcpy (outputbuffer.data + end, buf, avail);
283 memcpy (ns->outputbuffer.data, buf + avail, len - avail); 306 memcpy (outputbuffer.data, buf + avail, len - avail);
284 } 307 }
285 308
286 ns->outputbuffer.len += len; 309 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} 310}
291 311
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 312void
299write_socket_buffer (NewSocket * ns) 313client_socket::socket_cb (iow &w, int got)
300{ 314{
301 int amt, max; 315 write_outputbuffer ();
302 316
303 if (ns->outputbuffer.len == 0) 317 if (!outputbuffer.len)
304 { 318 socket_ev.poll (socket_ev.poll () & ~PE_W);
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} 319}
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
419 320
420/** 321/**
421 * Takes a string of data, and writes it out to the socket. A very handy 322 * Takes a string of data, and writes it out to the socket. A very handy
422 * shortcut function. 323 * shortcut function.
423 */ 324 */
424void 325void
425cs_write_string (NewSocket * ns, const char *buf, int len) 326client_socket::send_packet (packet &sl)
426{ 327{
427 SockList sl;
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) 328 if (status == Ns_Dead)
447 return; 329 return;
448 330
449 if (msg->len >= MAXSOCKBUF) 331 if (sl.length () >= MAXSOCKBUF)
450 { 332 {
451 LOG (llevError, "Trying to send a buffer beyond properly size, len =%d\n", msg->len); 333 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 334 /* Almost certainly we've overflowed a buffer, so quit now to make
453 * it easier to debug. 335 * it easier to debug.
454 */ 336 */
455 abort (); 337 abort ();
456 } 338 }
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}
463 339
464/** 340 if (!sl.length ())
465 * Takes a string of data, and writes it out to the socket. A very handy 341 return;
466 * shortcut function.
467 */
468void
469Write_String_To_Socket (NewSocket * ns, char *buf, int len)
470{
471 SockList sl;
472 342
473 sl.len = len; 343 assert (sl.hdrlen == 2);
474 sl.buf = (unsigned char *) buf;
475 Send_With_Handling (ns, &sl);
476}
477 344
345 sl.buf_ [0] = sl.length () >> 8;
346 sl.buf_ [1] = sl.length () ;
347
348 send (sl.buf_, sl.length () + sl.hdrlen);
349}
350
351void
352client_socket::send_packet (const char *buf, int len)
353{
354 packet sl;
355
356 sl << data (buf, len);
357 send_packet (sl);
358}
359
360void
361client_socket::send_packet (const char *buf)
362{
363 send_packet (buf, strlen (buf));
364}
478 365
479/****************************************************************************** 366/******************************************************************************
480 * 367 *
481 * statistics logging functions. 368 * statistics logging functions.
482 * 369 *
… …
505 LOG (llevInfo, "CSSTAT: %.16s tot %d %d %d %d inc %d %d %d %d\n", 392 LOG (llevInfo, "CSSTAT: %.16s tot %d %d %d %d inc %d %d %d %d\n",
506 ctime (&now), cst_tot.ibytes, cst_tot.obytes, cst_tot.max_conn, 393 ctime (&now), cst_tot.ibytes, cst_tot.obytes, cst_tot.max_conn,
507 now - cst_tot.time_start, cst_lst.ibytes, cst_lst.obytes, cst_lst.max_conn, now - cst_lst.time_start); 394 now - cst_tot.time_start, cst_lst.ibytes, cst_lst.obytes, cst_lst.max_conn, now - cst_lst.time_start);
508 cst_lst.ibytes = 0; 395 cst_lst.ibytes = 0;
509 cst_lst.obytes = 0; 396 cst_lst.obytes = 0;
510 cst_lst.max_conn = socket_info.nconns;
511 cst_lst.time_start = now; 397 cst_lst.time_start = now;
512} 398}
513#endif 399#endif
400

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