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Comparing deliantra/server/socket/lowlevel.C (file contents):
Revision 1.9 by root, Wed Dec 13 18:08:02 2006 UTC vs.
Revision 1.22 by root, Fri Dec 15 19:59:20 2006 UTC

… …
33 */ 33 */
34 34
35using namespace std; 35using namespace std;
36 36
37#include <global.h> 37#include <global.h>
38#include <newclient.h>
39#include <sproto.h> 38#include <sproto.h>
39#include <cstdarg>
40 40
41#ifdef __linux__ 41#ifdef __linux__
42# include <sys/types.h> 42# include <sys/types.h>
43# include <sys/socket.h> 43# include <sys/socket.h>
44# include <netinet/in.h> 44# include <netinet/in.h>
… …
50// easily die in 20 seconds... 50// easily die in 20 seconds...
51#define SOCKET_TIMEOUT1 10 51#define SOCKET_TIMEOUT1 10
52#define SOCKET_TIMEOUT2 20 52#define SOCKET_TIMEOUT2 20
53 53
54void 54void
55Socket_Flush (NewSocket * ns) 55client::flush ()
56{ 56{
57#ifdef __linux__ 57#ifdef __linux__
58 // check time of last ack, and, if too old, kill connection 58 // check time of last ack, and, if too old, kill connection
59 struct tcp_info tcpi; 59 struct tcp_info tcpi;
60 socklen_t len = sizeof (tcpi); 60 socklen_t len = sizeof (tcpi);
61 61
62 if (!getsockopt (ns->fd, IPPROTO_TCP, TCP_INFO, &tcpi, &len) && len == sizeof (tcpi)) 62 if (!getsockopt (fd, IPPROTO_TCP, TCP_INFO, &tcpi, &len) && len == sizeof (tcpi))
63 { 63 {
64 unsigned int diff = tcpi.tcpi_last_ack_recv - tcpi.tcpi_last_data_sent; 64 unsigned int diff = tcpi.tcpi_last_ack_recv - tcpi.tcpi_last_data_sent;
65
66 rtt = tcpi.tcpi_rtt;
67 rttvar = tcpi.tcpi_rttvar;
65 68
66 if (tcpi.tcpi_unacked && SOCKET_TIMEOUT1 * TCP_HZ < diff && diff < 0x80000000UL // ack delayed for 20s 69 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 70 && SOCKET_TIMEOUT2 * TCP_HZ < tcpi.tcpi_last_data_sent) // no data sent for 10s
68 { 71 {
69 LOG (llevDebug, "Connection on fd %d closed due to ack timeout (%u/%u/%u)\n", ns->fd, 72 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); 73 (unsigned) tcpi.tcpi_last_ack_recv, (unsigned) tcpi.tcpi_last_data_sent, (unsigned) tcpi.tcpi_unacked);
71 ns->status = Ns_Dead; 74 status = Ns_Dead;
72 } 75 }
73 } 76 }
74
75 int val;
76
77 val = 0; setsockopt (ns->fd, IPPROTO_TCP, TCP_CORK, &val, sizeof (val));
78 val = 1; setsockopt (ns->fd, IPPROTO_TCP, TCP_CORK, &val, sizeof (val));
79#endif 77#endif
78
79 /**
80 * Writes data to socket.
81 *
82 * When the socket is clear to write, and we have backlogged data, this
83 * is called to write it out.
84 */
85
86 if (!outputbuffer.len || socket_ev.poll () & PE_W)
87 return;
88
89 write_outputbuffer ();
90}
91
92void
93client::write_outputbuffer ()
94{
95 while (outputbuffer.len)
96 {
97 int res = write (fd, outputbuffer.data + outputbuffer.start,
98 min (outputbuffer.len, SOCKETBUFSIZE - outputbuffer.start));
99
100 if (res > 0)
101 {
102 outputbuffer.start += res;
103 /* wrap back to start of buffer */
104 if (outputbuffer.start == SOCKETBUFSIZE)
105 outputbuffer.start = 0;
106
107 outputbuffer.len -= res;
108#ifdef CS_LOGSTATS
109 cst_tot.obytes += res;
110 cst_lst.obytes += res;
111#endif
112 }
113 else if (res == 0)
114 {
115 LOG (llevError, "socket write failed, connection closed.\n");
116 status = Ns_Dead;
117 return;
118 }
119 else if (errno == EINTR)
120 {
121 // just retry
122 }
123 else if (errno == EAGAIN)
124 {
125 // delay till ready
126 socket_ev.poll (socket_ev.poll () | PE_W);
127 socket_ev.start ();
128 return;
129 }
130 else
131 {
132 LOG (llevError, "socket write failed: %s\n", strerror (errno));
133 status = Ns_Dead;
134 return;
135 }
136 }
137
138 socket_ev.poll (socket_ev.poll () & ~PE_W);
80} 139}
81 140
82/*********************************************************************** 141/***********************************************************************
83 * 142 *
84 * SockList functions/utilities 143 * packet functions/utilities
85 * 144 *
86 **********************************************************************/ 145 **********************************************************************/
87 146
88SockList &SockList::operator <<(const data8 &v) 147packet &packet::operator <<(const data &v)
89{ 148{
90 *this << uint8 (v.len); 149 if (room () < v.len)
91 150 reset ();
92 memcpy (buf + len, v.data, v.len); 151 else
93 len += v.len; 152 {
153 if (v.len)
154 {
155 memcpy (cur, v.ptr, v.len);
156 cur += v.len;
157 }
158 }
94 159
95 return *this; 160 return *this;
96} 161}
97 162
163packet &packet::operator <<(const data8 &v)
164{
165 unsigned int len = min (v.len, 0x00FF);
166 return *this << uint8 (len) << data (v.ptr, len);
167}
168
98SockList &SockList::operator <<(const data16 &v) 169packet &packet::operator <<(const data16 &v)
99{ 170{
100 *this << uint16 (v.len); 171 unsigned int len = min (v.len, 0xFFFF);
101 172 return *this << uint16 (len) << data (v.ptr, len);
102 memcpy (buf + len, v.data, v.len);
103 len += v.len;
104
105 return *this;
106} 173}
107 174
108/* Basically does the reverse of SockList_AddInt, but on 175packet &packet::operator <<(const char *v)
109 * strings instead. Same for the GetShort, but for 16 bits. 176{
177 return *this << data (v, strlen (v ? v : 0));
178}
179
180void
181packet::printf (const char *format, ...)
182{
183 int size = room ();
184
185 va_list ap;
186 va_start (ap, format);
187 int len = vsnprintf ((char *)cur, size, format, ap);
188 va_end (ap);
189
190 if (len >= size)
191 return reset ();
192
193 cur += len;
194}
195
196/******************************************************************************
110 */ 197 *
198 * Start of read routines.
199 *
200 ******************************************************************************/
201
111int 202int
112GetInt_String (unsigned char *data) 203client::read_packet ()
113{ 204{
114 return ((data[0] << 24) + (data[1] << 16) + (data[2] << 8) + data[3]); 205 for (;;)
115}
116
117short
118GetShort_String (unsigned char *data)
119{
120 return ((data[0] << 8) + data[1]);
121}
122
123/******************************************************************************
124 *
125 * Start of read routines.
126 *
127 ******************************************************************************/
128
129/**
130 * This reads from fd and puts the data in sl. We return true if we think
131 * we have a full packet, 0 if we have a partial packet. The only processing
132 * we do is remove the intial size value. len (As passed) is the size of the
133 * buffer allocated in the socklist. We make the assumption the buffer is
134 * at least 2 bytes long.
135 */
136
137int
138SockList_ReadPacket (int fd, SockList * sl, int len)
139{
140 int stat, toread;
141
142 /* Sanity check - shouldn't happen */
143 if (sl->len < 0)
144 {
145 abort ();
146 } 206 {
147 /* We already have a partial packet */ 207 if (inbuf_len >= 2)
148 if (sl->len < 2)
149 {
150 do
151 {
152 stat = read (fd, sl->buf + sl->len, 2 - sl->len);
153 } 208 {
154 while ((stat == -1) && (errno == EINTR)); 209 unsigned int pkt_len = (inbuf [0] << 8) | inbuf [1];
155 210
156 if (stat < 0) 211 if (inbuf_len >= 2 + pkt_len)
212 return pkt_len + 2;
157 { 213 }
158 /* In non blocking mode, EAGAIN is set when there is no 214
159 * data available. 215 int amount = sizeof (inbuf) - inbuf_len;
160 */ 216
217 if (amount <= 0)
218 {
219 LOG (llevError, "packet too large");//TODO
220 return -1;
221 }
222
223 amount = read (fd, inbuf + inbuf_len, amount);
224
225 if (!amount)
226 {
227 status = Ns_Dead;
228 return -1;
229 }
230 else if (amount < 0)
231 {
161 if (errno != EAGAIN && errno != EWOULDBLOCK) 232 if (errno != EAGAIN && errno != EINTR)
162 { 233 {
163 LOG (llevDebug, "ReadPacket got error %s, returning 0\n", strerror (errno)); 234 LOG (llevError, "read error: %s\n", strerror (errno));
235 return -1;
164 } 236 }
165 return 0; /*Error */
166 }
167 if (stat == 0)
168 return -1;
169 sl->len += stat;
170#ifdef CS_LOGSTATS
171 cst_tot.ibytes += stat;
172 cst_lst.ibytes += stat;
173#endif
174 if (stat < 2)
175 return 0; /* Still don't have a full packet */
176 }
177 /* Figure out how much more data we need to read. Add 2 from the
178 * end of this - size header information is not included.
179 */
180 toread = 2 + (sl->buf[0] << 8) + sl->buf[1] - sl->len;
181 if ((toread + sl->len) >= len)
182 {
183 LOG (llevError, "SockList_ReadPacket: Want to read more bytes than will fit in buffer (%d>=%d).\n", toread + sl->len, len);
184 /* Quick hack in case for 'oldsocketmode' input. If we are
185 * closing the socket anyways, then reading this extra 100 bytes
186 * shouldn't hurt.
187 */
188 read (fd, sl->buf + 2, 100);
189 237
190 /* return error so the socket is closed */
191 return -1;
192 }
193 do
194 {
195 do
196 {
197 stat = read (fd, sl->buf + sl->len, toread);
198 }
199 while ((stat < 0) && (errno == EINTR));
200 if (stat < 0)
201 {
202
203 if (errno != EAGAIN && errno != EWOULDBLOCK)
204 {
205 LOG (llevDebug, "ReadPacket got error %s, returning 0\n", strerror (errno));
206 }
207 return 0; /*Error */
208 }
209 if (stat == 0)
210 return -1;
211 sl->len += stat;
212#ifdef CS_LOGSTATS
213 cst_tot.ibytes += stat;
214 cst_lst.ibytes += stat;
215#endif
216 toread -= stat;
217 if (toread == 0)
218 return 1;
219 if (toread < 0)
220 {
221 LOG (llevError, "SockList_ReadPacket: Read more bytes than desired.\n");
222 return 1; 238 return 0;
223 } 239 }
240
241 inbuf_len += amount;
242
243 cst_tot.ibytes += amount;
244 cst_lst.ibytes += amount;
224 } 245 }
225 while (toread > 0); 246}
226 return 0; 247
248void
249client::skip_packet (int len)
250{
251 inbuf_len -= len;
252 memmove (inbuf, inbuf + len, inbuf_len);
227} 253}
228 254
229/******************************************************************************* 255/*******************************************************************************
230 * 256 *
231 * Start of write related routines. 257 * Start of write related routines.
… …
236 * Adds data to a socket buffer for whatever reason. 262 * Adds data to a socket buffer for whatever reason.
237 * 263 *
238 * ns is the socket we are adding the data to, buf is the start of the 264 * ns is the socket we are adding the data to, buf is the start of the
239 * data, and len is the number of bytes to add. 265 * data, and len is the number of bytes to add.
240 */ 266 */
241 267void
242static void 268client::send (void *buf_, int len)
243add_to_buffer (NewSocket * ns, char *buf, int len)
244{ 269{
270 char *buf = (char *)buf_;
271 char *pos = buf;
272 int amt = 0;
273
274 if (status == Ns_Dead || !buf)
275 {
276 LOG (llevDebug, "Write_To_Socket called with dead socket\n");
277 return;
278 }
279
280 if ((len + outputbuffer.len) > SOCKETBUFSIZE)
281 {
282 LOG (llevDebug, "Socket on fd %d has overrun internal buffer - marking as dead\n", fd);
283 status = Ns_Dead;
284 return;
285 }
286
245 int avail, end; 287 int avail, end;
246
247 if ((len + ns->outputbuffer.len) > SOCKETBUFSIZE)
248 {
249 LOG (llevDebug, "Socket on fd %d has overrun internal buffer - marking as dead\n", ns->fd);
250 ns->status = Ns_Dead;
251 return;
252 }
253 288
254 /* data + end is where we start putting the new data. The last byte 289 /* data + end is where we start putting the new data. The last byte
255 * currently in use is actually data + end -1 290 * currently in use is actually data + end -1
256 */ 291 */
257
258 end = ns->outputbuffer.start + ns->outputbuffer.len; 292 end = outputbuffer.start + outputbuffer.len;
259 /* The buffer is already in a wrapped state, so adjust end */ 293 /* The buffer is already in a wrapped state, so adjust end */
260 if (end >= SOCKETBUFSIZE) 294 if (end >= SOCKETBUFSIZE)
261 end -= SOCKETBUFSIZE; 295 end -= SOCKETBUFSIZE;
262 296
263 avail = SOCKETBUFSIZE - end; 297 avail = SOCKETBUFSIZE - end;
264 298
265 /* We can all fit it behind the current data without wrapping */ 299 /* We can all fit it behind the current data without wrapping */
266 if (avail >= len) 300 if (avail >= len)
267 memcpy (ns->outputbuffer.data + end, buf, len); 301 memcpy (outputbuffer.data + end, buf, len);
268 else 302 else
269 { 303 {
270 memcpy (ns->outputbuffer.data + end, buf, avail); 304 memcpy (outputbuffer.data + end, buf, avail);
271 memcpy (ns->outputbuffer.data, buf + avail, len - avail); 305 memcpy (outputbuffer.data, buf + avail, len - avail);
272 } 306 }
273 307
274 ns->outputbuffer.len += len; 308 outputbuffer.len += len;
275#if 0
276 LOG (llevDebug, "Added %d to output buffer, total length now %d, start=%d\n", len, ns->outputbuffer.len, ns->outputbuffer.start);
277#endif
278} 309}
279 310
280/**
281 * Writes data to socket.
282 *
283 * When the socket is clear to write, and we have backlogged data, this
284 * is called to write it out.
285 */
286void 311void
287write_socket_buffer (NewSocket * ns) 312client::socket_cb (iow &w, int got)
288{ 313{
289 int amt, max; 314 write_outputbuffer ();
290 315
291 if (ns->outputbuffer.len == 0) 316 if (!outputbuffer.len)
292 { 317 socket_ev.poll (socket_ev.poll () & ~PE_W);
293 LOG (llevDebug, "write_socket_buffer called when there is no data, fd=%d\n", ns->fd);
294 return;
295 }
296
297 do
298 {
299 max = SOCKETBUFSIZE - ns->outputbuffer.start;
300 if (ns->outputbuffer.len < max)
301 max = ns->outputbuffer.len;
302
303 do
304 {
305 amt = write (ns->fd, ns->outputbuffer.data + ns->outputbuffer.start, max);
306 }
307 while ((amt < 0) && (errno == EINTR));
308
309 if (amt < 0)
310 { /* We got an error */
311
312 if (errno != EWOULDBLOCK)
313 {
314 LOG (llevError, "New socket write failed (wsb) (%d: %s).\n", errno, strerror (errno));
315 ns->status = Ns_Dead;
316 return;
317 }
318 else
319 { /* EWOULDBLOCK */
320 /* can't write it, so store it away. */
321 ns->can_write = 0;
322 return;
323 }
324 }
325 ns->outputbuffer.start += amt;
326 /* wrap back to start of buffer */
327 if (ns->outputbuffer.start == SOCKETBUFSIZE)
328 ns->outputbuffer.start = 0;
329 ns->outputbuffer.len -= amt;
330#ifdef CS_LOGSTATS
331 cst_tot.obytes += amt;
332 cst_lst.obytes += amt;
333#endif
334 }
335 while (ns->outputbuffer.len > 0);
336} 318}
337
338/**
339 * This writes data to the socket. - It is very low level -
340 * all we try and do is write out the data to the socket
341 * provided (ns). buf is the data to write, len is the number
342 * of bytes to write. IT doesn't return anything - rather, it
343 * updates the ns structure if we get an error.
344 */
345void
346Write_To_Socket (NewSocket * ns, char *buf, int len)
347{
348 int amt = 0;
349 char *pos = buf;
350
351 if (ns->status == Ns_Dead || !buf)
352 {
353 LOG (llevDebug, "Write_To_Socket called with dead socket\n");
354 return;
355 }
356
357#ifndef __GNU__ /* This caused problems on Hurd */
358 if (!ns->can_write)
359 {
360 add_to_buffer (ns, buf, len);
361 return;
362 }
363#endif
364 /* If we manage to write more than we wanted, take it as a bonus */
365 while (len > 0)
366 {
367
368 do
369 {
370 amt = write (ns->fd, pos, len);
371 }
372 while ((amt < 0) && (errno == EINTR));
373
374 if (amt < 0)
375 { /* We got an error */
376 if (errno != EWOULDBLOCK)
377 {
378 LOG (llevError, "New socket write failed WTS (%d: %s).\n", /* ---WIN32 */
379 errno, strerror (errno));
380 ns->status = Ns_Dead;
381 return;
382 }
383 else
384 { /* EWOULDBLOCK */
385 /* can't write it, so store it away. */
386 add_to_buffer (ns, pos, len);
387 ns->can_write = 0;
388 return;
389 }
390 }
391 /* amt gets set to 0 above in blocking code, so we do this as
392 * an else if to make sure we don't reprocess it.
393 */
394 else if (amt == 0)
395 {
396 LOG (llevError, "Write_To_Socket: No data written out.\n");
397 }
398 len -= amt;
399 pos += amt;
400#ifdef CS_LOGSTATS
401 cst_tot.obytes += amt;
402 cst_lst.obytes += amt;
403#endif
404 }
405}
406
407 319
408/** 320/**
409 * Takes a string of data, and writes it out to the socket. A very handy 321 * Takes a string of data, and writes it out to the socket. A very handy
410 * shortcut function. 322 * shortcut function.
411 */ 323 */
412void 324void
413cs_write_string (NewSocket * ns, const char *buf, int len) 325client::send_packet (packet &sl)
414{ 326{
415 SockList sl;
416
417 sl.len = len;
418 sl.buf = (unsigned char *) buf;
419 Send_With_Handling (ns, &sl);
420}
421
422
423/**
424 * Calls Write_To_Socket to send data to the client.
425 *
426 * The only difference in this function is that we take a SockList
427 *, and we prepend the length information.
428 */
429void
430Send_With_Handling (NewSocket * ns, SockList * msg)
431{
432 unsigned char sbuf[4];
433
434 if (ns->status == Ns_Dead || !msg) 327 if (status == Ns_Dead)
435 return; 328 return;
436 329
437 if (msg->len >= MAXSOCKBUF) 330 if (sl.length () >= MAXSOCKBUF)
438 { 331 {
439 LOG (llevError, "Trying to send a buffer beyond properly size, len =%d\n", msg->len); 332 LOG (llevError, "Trying to send a buffer beyond properly size, len =%d\n", sl.length ());
440 /* Almost certainly we've overflowed a buffer, so quite now to make 333 /* Almost certainly we've overflowed a buffer, so quit now to make
441 * it easier to debug. 334 * it easier to debug.
442 */ 335 */
443 abort (); 336 abort ();
444 } 337 }
445 sbuf[0] = ((uint32) (msg->len) >> 8) & 0xFF;
446 sbuf[1] = ((uint32) (msg->len)) & 0xFF;
447 if (ns->status != Ns_Old)
448 Write_To_Socket (ns, (char *) sbuf, 2);
449 Write_To_Socket (ns, (char *) msg->buf, msg->len);
450}
451 338
452/** 339 if (!sl.length ())
453 * Takes a string of data, and writes it out to the socket. A very handy 340 return;
454 * shortcut function.
455 */
456void
457Write_String_To_Socket (NewSocket * ns, char *buf, int len)
458{
459 SockList sl;
460 341
461 sl.len = len; 342 assert (sl.hdrlen == 2);
462 sl.buf = (unsigned char *) buf;
463 Send_With_Handling (ns, &sl);
464}
465 343
344 sl.buf_ [0] = sl.length () >> 8;
345 sl.buf_ [1] = sl.length () ;
346
347 send (sl.buf_, sl.length () + sl.hdrlen);
348}
349
350void
351client::send_packet (const char *buf, int len)
352{
353 packet sl;
354
355 sl << data (buf, len);
356 send_packet (sl);
357}
358
359void
360client::send_packet (const char *buf)
361{
362 send_packet (buf, strlen (buf));
363}
466 364
467/****************************************************************************** 365/******************************************************************************
468 * 366 *
469 * statistics logging functions. 367 * statistics logging functions.
470 * 368 *
… …
493 LOG (llevInfo, "CSSTAT: %.16s tot %d %d %d %d inc %d %d %d %d\n", 391 LOG (llevInfo, "CSSTAT: %.16s tot %d %d %d %d inc %d %d %d %d\n",
494 ctime (&now), cst_tot.ibytes, cst_tot.obytes, cst_tot.max_conn, 392 ctime (&now), cst_tot.ibytes, cst_tot.obytes, cst_tot.max_conn,
495 now - cst_tot.time_start, cst_lst.ibytes, cst_lst.obytes, cst_lst.max_conn, now - cst_lst.time_start); 393 now - cst_tot.time_start, cst_lst.ibytes, cst_lst.obytes, cst_lst.max_conn, now - cst_lst.time_start);
496 cst_lst.ibytes = 0; 394 cst_lst.ibytes = 0;
497 cst_lst.obytes = 0; 395 cst_lst.obytes = 0;
498 cst_lst.max_conn = socket_info.nconns;
499 cst_lst.time_start = now; 396 cst_lst.time_start = now;
500} 397}
501#endif 398#endif
502 399

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