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Comparing deliantra/server/socket/lowlevel.C (file contents):
Revision 1.14 by root, Thu Dec 14 01:21:58 2006 UTC vs.
Revision 1.21 by root, Fri Dec 15 00:14:13 2006 UTC

… …
51// easily die in 20 seconds... 51// easily die in 20 seconds...
52#define SOCKET_TIMEOUT1 10 52#define SOCKET_TIMEOUT1 10
53#define SOCKET_TIMEOUT2 20 53#define SOCKET_TIMEOUT2 20
54 54
55void 55void
56Socket_Flush (NewSocket * ns) 56client_socket::flush ()
57{ 57{
58#ifdef __linux__ 58#ifdef __linux__
59 // check time of last ack, and, if too old, kill connection 59 // check time of last ack, and, if too old, kill connection
60 struct tcp_info tcpi; 60 struct tcp_info tcpi;
61 socklen_t len = sizeof (tcpi); 61 socklen_t len = sizeof (tcpi);
62 62
63 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))
64 { 64 {
65 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;
66 69
67 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
68 && 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
69 { 72 {
70 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,
71 (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);
72 ns->status = Ns_Dead; 75 status = Ns_Dead;
73 } 76 }
74 } 77 }
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 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);
81} 140}
82 141
83/*********************************************************************** 142/***********************************************************************
84 * 143 *
85 * packet functions/utilities 144 * packet functions/utilities
86 * 145 *
87 **********************************************************************/ 146 **********************************************************************/
88 147
89packet &packet::operator <<(const data &v) 148packet &packet::operator <<(const data &v)
90{ 149{
150 if (room () < v.len)
151 reset ();
152 else
153 {
91 if (v.len) 154 if (v.len)
92 { 155 {
93 memcpy (buf + len, v.ptr, v.len); 156 memcpy (cur, v.ptr, v.len);
94 len += v.len; 157 cur += v.len;
158 }
95 } 159 }
96 160
97 return *this; 161 return *this;
98} 162}
99 163
… …
115} 179}
116 180
117void 181void
118packet::printf (const char *format, ...) 182packet::printf (const char *format, ...)
119{ 183{
184 int size = room ();
185
120 va_list ap; 186 va_list ap;
121 va_start (ap, format); 187 va_start (ap, format);
122 188 int len = vsnprintf ((char *)cur, size, format, ap);
123 len += vsnprintf ((char *)buf + len, MAXSOCKBUF, format, ap);
124
125 va_end (ap); 189 va_end (ap);
190
191 if (len >= size)
192 return reset ();
193
194 cur += len;
126} 195}
127 196
128/****************************************************************************** 197/******************************************************************************
129 * 198 *
130 * Start of read routines. 199 * Start of read routines.
131 * 200 *
132 ******************************************************************************/ 201 ******************************************************************************/
133 202
134int 203int
135NewSocket::read_packet () 204client_socket::read_packet ()
136{ 205{
137 for (;;) 206 for (;;)
138 { 207 {
139 if (inbuf_len >= 2) 208 if (inbuf_len >= 2)
140 { 209 {
… …
161 } 230 }
162 else if (amount < 0) 231 else if (amount < 0)
163 { 232 {
164 if (errno != EAGAIN && errno != EINTR) 233 if (errno != EAGAIN && errno != EINTR)
165 { 234 {
166 LOG (llevError, "read error: %s", strerror (errno)); 235 LOG (llevError, "read error: %s\n", strerror (errno));
167 return -1; 236 return -1;
168 } 237 }
169 238
170 return 0; 239 return 0;
171 } 240 }
… …
176 cst_lst.ibytes += amount; 245 cst_lst.ibytes += amount;
177 } 246 }
178} 247}
179 248
180void 249void
181NewSocket::skip_packet (int len) 250client_socket::skip_packet (int len)
182{ 251{
183 inbuf_len -= len; 252 inbuf_len -= len;
184 memmove (inbuf, inbuf + len, inbuf_len); 253 memmove (inbuf, inbuf + len, inbuf_len);
185} 254}
186 255
… …
194 * Adds data to a socket buffer for whatever reason. 263 * Adds data to a socket buffer for whatever reason.
195 * 264 *
196 * 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
197 * data, and len is the number of bytes to add. 266 * data, and len is the number of bytes to add.
198 */ 267 */
199 268void
200static void 269client_socket::send (void *buf_, int len)
201add_to_buffer (NewSocket *ns, char *buf, int len)
202{ 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
203 int avail, end; 288 int avail, end;
204
205 if ((len + ns->outputbuffer.len) > SOCKETBUFSIZE)
206 {
207 LOG (llevDebug, "Socket on fd %d has overrun internal buffer - marking as dead\n", ns->fd);
208 ns->status = Ns_Dead;
209 return;
210 }
211 289
212 /* 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
213 * currently in use is actually data + end -1 291 * currently in use is actually data + end -1
214 */ 292 */
215
216 end = ns->outputbuffer.start + ns->outputbuffer.len; 293 end = outputbuffer.start + outputbuffer.len;
217 /* The buffer is already in a wrapped state, so adjust end */ 294 /* The buffer is already in a wrapped state, so adjust end */
218 if (end >= SOCKETBUFSIZE) 295 if (end >= SOCKETBUFSIZE)
219 end -= SOCKETBUFSIZE; 296 end -= SOCKETBUFSIZE;
220 297
221 avail = SOCKETBUFSIZE - end; 298 avail = SOCKETBUFSIZE - end;
222 299
223 /* We can all fit it behind the current data without wrapping */ 300 /* We can all fit it behind the current data without wrapping */
224 if (avail >= len) 301 if (avail >= len)
225 memcpy (ns->outputbuffer.data + end, buf, len); 302 memcpy (outputbuffer.data + end, buf, len);
226 else 303 else
227 { 304 {
228 memcpy (ns->outputbuffer.data + end, buf, avail); 305 memcpy (outputbuffer.data + end, buf, avail);
229 memcpy (ns->outputbuffer.data, buf + avail, len - avail); 306 memcpy (outputbuffer.data, buf + avail, len - avail);
230 } 307 }
231 308
232 ns->outputbuffer.len += len; 309 outputbuffer.len += len;
233#if 0
234 LOG (llevDebug, "Added %d to output buffer, total length now %d, start=%d\n", len, ns->outputbuffer.len, ns->outputbuffer.start);
235#endif
236} 310}
237 311
238/**
239 * Writes data to socket.
240 *
241 * When the socket is clear to write, and we have backlogged data, this
242 * is called to write it out.
243 */
244void 312void
245write_socket_buffer (NewSocket * ns) 313client_socket::socket_cb (iow &w, int got)
246{ 314{
247 int amt, max; 315 write_outputbuffer ();
248 316
249 if (ns->outputbuffer.len == 0) 317 if (!outputbuffer.len)
250 { 318 socket_ev.poll (socket_ev.poll () & ~PE_W);
251 LOG (llevDebug, "write_socket_buffer called when there is no data, fd=%d\n", ns->fd);
252 return;
253 }
254
255 do
256 {
257 max = SOCKETBUFSIZE - ns->outputbuffer.start;
258 if (ns->outputbuffer.len < max)
259 max = ns->outputbuffer.len;
260
261 do
262 {
263 amt = write (ns->fd, ns->outputbuffer.data + ns->outputbuffer.start, max);
264 }
265 while ((amt < 0) && (errno == EINTR));
266
267 if (amt < 0)
268 { /* We got an error */
269
270 if (errno != EWOULDBLOCK)
271 {
272 LOG (llevError, "New socket write failed (wsb) (%d: %s).\n", errno, strerror (errno));
273 ns->status = Ns_Dead;
274 return;
275 }
276 else
277 { /* EWOULDBLOCK */
278 /* can't write it, so store it away. */
279 ns->can_write = 0;
280 return;
281 }
282 }
283 ns->outputbuffer.start += amt;
284 /* wrap back to start of buffer */
285 if (ns->outputbuffer.start == SOCKETBUFSIZE)
286 ns->outputbuffer.start = 0;
287 ns->outputbuffer.len -= amt;
288#ifdef CS_LOGSTATS
289 cst_tot.obytes += amt;
290 cst_lst.obytes += amt;
291#endif
292 }
293 while (ns->outputbuffer.len > 0);
294}
295
296/**
297 * This writes data to the socket. - It is very low level -
298 * all we try and do is write out the data to the socket
299 * provided (ns). buf is the data to write, len is the number
300 * of bytes to write. IT doesn't return anything - rather, it
301 * updates the ns structure if we get an error.
302 */
303void
304Write_To_Socket (NewSocket * ns, char *buf, int len)
305{
306 int amt = 0;
307 char *pos = buf;
308
309 if (ns->status == Ns_Dead || !buf)
310 {
311 LOG (llevDebug, "Write_To_Socket called with dead socket\n");
312 return;
313 }
314
315#ifndef __GNU__ /* This caused problems on Hurd */
316 if (!ns->can_write)
317 {
318 add_to_buffer (ns, buf, len);
319 return;
320 }
321#endif
322 /* If we manage to write more than we wanted, take it as a bonus */
323 while (len > 0)
324 {
325
326 do
327 {
328 amt = write (ns->fd, pos, len);
329 }
330 while ((amt < 0) && (errno == EINTR));
331
332 if (amt < 0)
333 { /* We got an error */
334 if (errno != EWOULDBLOCK)
335 {
336 LOG (llevError, "New socket write failed WTS (%d: %s).\n", /* ---WIN32 */
337 errno, strerror (errno));
338 ns->status = Ns_Dead;
339 return;
340 }
341 else
342 { /* EWOULDBLOCK */
343 /* can't write it, so store it away. */
344 add_to_buffer (ns, pos, len);
345 ns->can_write = 0;
346 return;
347 }
348 }
349 /* amt gets set to 0 above in blocking code, so we do this as
350 * an else if to make sure we don't reprocess it.
351 */
352 else if (amt == 0)
353 {
354 LOG (llevError, "Write_To_Socket: No data written out.\n");
355 }
356 len -= amt;
357 pos += amt;
358#ifdef CS_LOGSTATS
359 cst_tot.obytes += amt;
360 cst_lst.obytes += amt;
361#endif
362 }
363} 319}
364 320
365/** 321/**
366 * 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
367 * shortcut function. 323 * shortcut function.
368 */ 324 */
369
370void 325void
371NewSocket::send_packet (packet &sl) 326client_socket::send_packet (packet &sl)
372{ 327{
373 Send_With_Handling (this, &sl);
374}
375
376void
377NewSocket::send_packet (const char *buf, int len)
378{
379 packet sl;
380
381 sl << data (buf, len);
382 send_packet (sl);
383}
384
385void
386NewSocket::send_packet (const char *buf)
387{
388 send_packet (buf, strlen (buf));
389}
390
391/**
392 * Calls Write_To_Socket to send data to the client.
393 *
394 * The only difference in this function is that we take a packet
395 *, and we prepend the length information.
396 */
397void
398Send_With_Handling (NewSocket *ns, packet *msg)
399{
400 unsigned char sbuf[4];
401
402 if (ns->status == Ns_Dead || !msg) 328 if (status == Ns_Dead)
403 return; 329 return;
404 330
405 if (msg->len >= MAXSOCKBUF) 331 if (sl.length () >= MAXSOCKBUF)
406 { 332 {
407 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 ());
408 /* 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
409 * it easier to debug. 335 * it easier to debug.
410 */ 336 */
411 abort (); 337 abort ();
412 } 338 }
413 sbuf[0] = ((uint32) (msg->len) >> 8) & 0xFF; 339
414 sbuf[1] = ((uint32) (msg->len)) & 0xFF; 340 if (!sl.length ())
415 if (ns->status != Ns_Old) 341 return;
416 Write_To_Socket (ns, (char *) sbuf, 2); 342
417 Write_To_Socket (ns, (char *) msg->buf, msg->len); 343 assert (sl.hdrlen == 2);
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));
418} 364}
419 365
420/****************************************************************************** 366/******************************************************************************
421 * 367 *
422 * statistics logging functions. 368 * statistics logging functions.
… …
446 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",
447 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,
448 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);
449 cst_lst.ibytes = 0; 395 cst_lst.ibytes = 0;
450 cst_lst.obytes = 0; 396 cst_lst.obytes = 0;
451 cst_lst.max_conn = socket_info.nconns;
452 cst_lst.time_start = now; 397 cst_lst.time_start = now;
453} 398}
454#endif 399#endif
455 400

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