| 1 |
/* |
| 2 |
CrossFire, A Multiplayer game for X-windows |
| 3 |
|
| 4 |
Copyright (C) 1992 Frank Tore Johansen |
| 5 |
|
| 6 |
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 |
the Free Software Foundation; either version 2 of the License, or |
| 9 |
(at your option) any later version. |
| 10 |
|
| 11 |
This program is distributed in the hope that it will be useful, |
| 12 |
but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 13 |
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 14 |
GNU General Public License for more details. |
| 15 |
|
| 16 |
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 |
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. |
| 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 |
* |
| 27 |
* \date 2003-12-02 |
| 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 |
*/ |
| 34 |
|
| 35 |
using namespace std; |
| 36 |
|
| 37 |
#include <global.h> |
| 38 |
#include <newclient.h> |
| 39 |
#include <sproto.h> |
| 40 |
#include <cstdarg> |
| 41 |
|
| 42 |
#ifdef __linux__ |
| 43 |
# include <sys/types.h> |
| 44 |
# include <sys/socket.h> |
| 45 |
# include <netinet/in.h> |
| 46 |
# define TCP_HZ 1000 // sorry... |
| 47 |
# include <netinet/tcp.h> |
| 48 |
#endif |
| 49 |
|
| 50 |
// use a really low timeout, as it doesn't cost any bandwidth, and you can |
| 51 |
// easily die in 20 seconds... |
| 52 |
#define SOCKET_TIMEOUT1 10 |
| 53 |
#define SOCKET_TIMEOUT2 20 |
| 54 |
|
| 55 |
void |
| 56 |
Socket_Flush (NewSocket * ns) |
| 57 |
{ |
| 58 |
#ifdef __linux__ |
| 59 |
// check time of last ack, and, if too old, kill connection |
| 60 |
struct tcp_info tcpi; |
| 61 |
socklen_t len = sizeof (tcpi); |
| 62 |
|
| 63 |
if (!getsockopt (ns->fd, IPPROTO_TCP, TCP_INFO, &tcpi, &len) && len == sizeof (tcpi)) |
| 64 |
{ |
| 65 |
unsigned int diff = tcpi.tcpi_last_ack_recv - tcpi.tcpi_last_data_sent; |
| 66 |
|
| 67 |
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 |
| 69 |
{ |
| 70 |
LOG (llevDebug, "Connection on fd %d closed due to ack timeout (%u/%u/%u)\n", ns->fd, |
| 71 |
(unsigned) tcpi.tcpi_last_ack_recv, (unsigned) tcpi.tcpi_last_data_sent, (unsigned) tcpi.tcpi_unacked); |
| 72 |
ns->status = Ns_Dead; |
| 73 |
} |
| 74 |
} |
| 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 |
| 81 |
} |
| 82 |
|
| 83 |
/*********************************************************************** |
| 84 |
* |
| 85 |
* packet functions/utilities |
| 86 |
* |
| 87 |
**********************************************************************/ |
| 88 |
|
| 89 |
packet &packet::operator <<(const data &v) |
| 90 |
{ |
| 91 |
if (room () < v.len) |
| 92 |
reset (); |
| 93 |
else |
| 94 |
{ |
| 95 |
if (v.len) |
| 96 |
{ |
| 97 |
memcpy (cur, v.ptr, v.len); |
| 98 |
cur += v.len; |
| 99 |
} |
| 100 |
} |
| 101 |
|
| 102 |
return *this; |
| 103 |
} |
| 104 |
|
| 105 |
packet &packet::operator <<(const data8 &v) |
| 106 |
{ |
| 107 |
unsigned int len = min (v.len, 0x00FF); |
| 108 |
return *this << uint8 (len) << data (v.ptr, len); |
| 109 |
} |
| 110 |
|
| 111 |
packet &packet::operator <<(const data16 &v) |
| 112 |
{ |
| 113 |
unsigned int len = min (v.len, 0xFFFF); |
| 114 |
return *this << uint16 (len) << data (v.ptr, len); |
| 115 |
} |
| 116 |
|
| 117 |
packet &packet::operator <<(const char *v) |
| 118 |
{ |
| 119 |
return *this << data (v, strlen (v ? v : 0)); |
| 120 |
} |
| 121 |
|
| 122 |
void |
| 123 |
packet::printf (const char *format, ...) |
| 124 |
{ |
| 125 |
int size = room (); |
| 126 |
|
| 127 |
va_list ap; |
| 128 |
va_start (ap, format); |
| 129 |
int len = vsnprintf ((char *)cur, size, format, ap); |
| 130 |
va_end (ap); |
| 131 |
|
| 132 |
if (len >= size) |
| 133 |
return reset (); |
| 134 |
|
| 135 |
cur += len; |
| 136 |
} |
| 137 |
|
| 138 |
/****************************************************************************** |
| 139 |
* |
| 140 |
* Start of read routines. |
| 141 |
* |
| 142 |
******************************************************************************/ |
| 143 |
|
| 144 |
int |
| 145 |
NewSocket::read_packet () |
| 146 |
{ |
| 147 |
for (;;) |
| 148 |
{ |
| 149 |
if (inbuf_len >= 2) |
| 150 |
{ |
| 151 |
unsigned int pkt_len = (inbuf [0] << 8) | inbuf [1]; |
| 152 |
|
| 153 |
if (inbuf_len >= 2 + pkt_len) |
| 154 |
return pkt_len + 2; |
| 155 |
} |
| 156 |
|
| 157 |
int amount = sizeof (inbuf) - inbuf_len; |
| 158 |
|
| 159 |
if (amount <= 0) |
| 160 |
{ |
| 161 |
LOG (llevError, "packet too large");//TODO |
| 162 |
return -1; |
| 163 |
} |
| 164 |
|
| 165 |
amount = read (fd, inbuf + inbuf_len, amount); |
| 166 |
|
| 167 |
if (!amount) |
| 168 |
{ |
| 169 |
status = Ns_Dead; |
| 170 |
return -1; |
| 171 |
} |
| 172 |
else if (amount < 0) |
| 173 |
{ |
| 174 |
if (errno != EAGAIN && errno != EINTR) |
| 175 |
{ |
| 176 |
LOG (llevError, "read error: %s", strerror (errno)); |
| 177 |
return -1; |
| 178 |
} |
| 179 |
|
| 180 |
return 0; |
| 181 |
} |
| 182 |
|
| 183 |
inbuf_len += amount; |
| 184 |
|
| 185 |
cst_tot.ibytes += amount; |
| 186 |
cst_lst.ibytes += amount; |
| 187 |
} |
| 188 |
} |
| 189 |
|
| 190 |
void |
| 191 |
NewSocket::skip_packet (int len) |
| 192 |
{ |
| 193 |
inbuf_len -= len; |
| 194 |
memmove (inbuf, inbuf + len, inbuf_len); |
| 195 |
} |
| 196 |
|
| 197 |
/******************************************************************************* |
| 198 |
* |
| 199 |
* Start of write related routines. |
| 200 |
* |
| 201 |
******************************************************************************/ |
| 202 |
|
| 203 |
/** |
| 204 |
* Adds data to a socket buffer for whatever reason. |
| 205 |
* |
| 206 |
* ns is the socket we are adding the data to, buf is the start of the |
| 207 |
* data, and len is the number of bytes to add. |
| 208 |
*/ |
| 209 |
|
| 210 |
static void |
| 211 |
add_to_buffer (NewSocket *ns, char *buf, int len) |
| 212 |
{ |
| 213 |
int avail, end; |
| 214 |
|
| 215 |
if ((len + ns->outputbuffer.len) > SOCKETBUFSIZE) |
| 216 |
{ |
| 217 |
LOG (llevDebug, "Socket on fd %d has overrun internal buffer - marking as dead\n", ns->fd); |
| 218 |
ns->status = Ns_Dead; |
| 219 |
return; |
| 220 |
} |
| 221 |
|
| 222 |
/* data + end is where we start putting the new data. The last byte |
| 223 |
* currently in use is actually data + end -1 |
| 224 |
*/ |
| 225 |
|
| 226 |
end = ns->outputbuffer.start + ns->outputbuffer.len; |
| 227 |
/* The buffer is already in a wrapped state, so adjust end */ |
| 228 |
if (end >= SOCKETBUFSIZE) |
| 229 |
end -= SOCKETBUFSIZE; |
| 230 |
|
| 231 |
avail = SOCKETBUFSIZE - end; |
| 232 |
|
| 233 |
/* We can all fit it behind the current data without wrapping */ |
| 234 |
if (avail >= len) |
| 235 |
memcpy (ns->outputbuffer.data + end, buf, len); |
| 236 |
else |
| 237 |
{ |
| 238 |
memcpy (ns->outputbuffer.data + end, buf, avail); |
| 239 |
memcpy (ns->outputbuffer.data, buf + avail, len - avail); |
| 240 |
} |
| 241 |
|
| 242 |
ns->outputbuffer.len += len; |
| 243 |
#if 0 |
| 244 |
LOG (llevDebug, "Added %d to output buffer, total length now %d, start=%d\n", len, ns->outputbuffer.len, ns->outputbuffer.start); |
| 245 |
#endif |
| 246 |
} |
| 247 |
|
| 248 |
/** |
| 249 |
* Writes data to socket. |
| 250 |
* |
| 251 |
* When the socket is clear to write, and we have backlogged data, this |
| 252 |
* is called to write it out. |
| 253 |
*/ |
| 254 |
void |
| 255 |
write_socket_buffer (NewSocket * ns) |
| 256 |
{ |
| 257 |
int amt, max; |
| 258 |
|
| 259 |
if (ns->outputbuffer.len == 0) |
| 260 |
{ |
| 261 |
LOG (llevDebug, "write_socket_buffer called when there is no data, fd=%d\n", ns->fd); |
| 262 |
return; |
| 263 |
} |
| 264 |
|
| 265 |
do |
| 266 |
{ |
| 267 |
max = SOCKETBUFSIZE - ns->outputbuffer.start; |
| 268 |
if (ns->outputbuffer.len < max) |
| 269 |
max = ns->outputbuffer.len; |
| 270 |
|
| 271 |
do |
| 272 |
{ |
| 273 |
amt = write (ns->fd, ns->outputbuffer.data + ns->outputbuffer.start, max); |
| 274 |
} |
| 275 |
while ((amt < 0) && (errno == EINTR)); |
| 276 |
|
| 277 |
if (amt < 0) |
| 278 |
{ /* We got an error */ |
| 279 |
|
| 280 |
if (errno != EWOULDBLOCK) |
| 281 |
{ |
| 282 |
LOG (llevError, "New socket write failed (wsb) (%d: %s).\n", errno, strerror (errno)); |
| 283 |
ns->status = Ns_Dead; |
| 284 |
return; |
| 285 |
} |
| 286 |
else |
| 287 |
{ /* EWOULDBLOCK */ |
| 288 |
/* can't write it, so store it away. */ |
| 289 |
ns->can_write = 0; |
| 290 |
return; |
| 291 |
} |
| 292 |
} |
| 293 |
ns->outputbuffer.start += amt; |
| 294 |
/* wrap back to start of buffer */ |
| 295 |
if (ns->outputbuffer.start == SOCKETBUFSIZE) |
| 296 |
ns->outputbuffer.start = 0; |
| 297 |
ns->outputbuffer.len -= amt; |
| 298 |
#ifdef CS_LOGSTATS |
| 299 |
cst_tot.obytes += amt; |
| 300 |
cst_lst.obytes += amt; |
| 301 |
#endif |
| 302 |
} |
| 303 |
while (ns->outputbuffer.len > 0); |
| 304 |
} |
| 305 |
|
| 306 |
/** |
| 307 |
* This writes data to the socket. - It is very low level - |
| 308 |
* all we try and do is write out the data to the socket |
| 309 |
* provided (ns). buf is the data to write, len is the number |
| 310 |
* of bytes to write. IT doesn't return anything - rather, it |
| 311 |
* updates the ns structure if we get an error. |
| 312 |
*/ |
| 313 |
void |
| 314 |
NewSocket::send (void *buf_, int len) |
| 315 |
{ |
| 316 |
char *buf = (char *)buf_; |
| 317 |
char *pos = buf; |
| 318 |
int amt = 0; |
| 319 |
|
| 320 |
if (status == Ns_Dead || !buf) |
| 321 |
{ |
| 322 |
LOG (llevDebug, "Write_To_Socket called with dead socket\n"); |
| 323 |
return; |
| 324 |
} |
| 325 |
|
| 326 |
#ifndef __GNU__ /* This caused problems on Hurd */ |
| 327 |
if (!can_write) |
| 328 |
{ |
| 329 |
add_to_buffer (this, buf, len); |
| 330 |
return; |
| 331 |
} |
| 332 |
#endif |
| 333 |
|
| 334 |
/* If we manage to write more than we wanted, take it as a bonus */ |
| 335 |
while (len > 0) |
| 336 |
{ |
| 337 |
do |
| 338 |
{ |
| 339 |
amt = write (fd, pos, len); |
| 340 |
} |
| 341 |
while ((amt < 0) && (errno == EINTR)); |
| 342 |
|
| 343 |
if (amt < 0) |
| 344 |
{ /* We got an error */ |
| 345 |
if (errno != EWOULDBLOCK) |
| 346 |
{ |
| 347 |
LOG (llevError, "New socket write failed WTS (%d: %s).\n", /* ---WIN32 */ |
| 348 |
errno, strerror (errno)); |
| 349 |
status = Ns_Dead; |
| 350 |
return; |
| 351 |
} |
| 352 |
else |
| 353 |
{ /* EWOULDBLOCK */ |
| 354 |
/* can't write it, so store it away. */ |
| 355 |
add_to_buffer (this, pos, len); |
| 356 |
can_write = 0; |
| 357 |
return; |
| 358 |
} |
| 359 |
} |
| 360 |
/* amt gets set to 0 above in blocking code, so we do this as |
| 361 |
* an else if to make sure we don't reprocess it. |
| 362 |
*/ |
| 363 |
else if (amt == 0) |
| 364 |
LOG (llevError, "Write_To_Socket: No data written out.\n"); |
| 365 |
|
| 366 |
len -= amt; |
| 367 |
pos += amt; |
| 368 |
#ifdef CS_LOGSTATS |
| 369 |
cst_tot.obytes += amt; |
| 370 |
cst_lst.obytes += amt; |
| 371 |
#endif |
| 372 |
} |
| 373 |
} |
| 374 |
|
| 375 |
/** |
| 376 |
* Takes a string of data, and writes it out to the socket. A very handy |
| 377 |
* shortcut function. |
| 378 |
*/ |
| 379 |
|
| 380 |
void |
| 381 |
NewSocket::send_packet (packet &sl) |
| 382 |
{ |
| 383 |
Send_With_Handling (this, &sl); |
| 384 |
} |
| 385 |
|
| 386 |
void |
| 387 |
NewSocket::send_packet (const char *buf, int len) |
| 388 |
{ |
| 389 |
packet sl; |
| 390 |
|
| 391 |
sl << data (buf, len); |
| 392 |
send_packet (sl); |
| 393 |
} |
| 394 |
|
| 395 |
void |
| 396 |
NewSocket::send_packet (const char *buf) |
| 397 |
{ |
| 398 |
send_packet (buf, strlen (buf)); |
| 399 |
} |
| 400 |
|
| 401 |
/** |
| 402 |
* Calls Write_To_Socket to send data to the client. |
| 403 |
* |
| 404 |
* The only difference in this function is that we take a packet |
| 405 |
*, and we prepend the length information. |
| 406 |
*/ |
| 407 |
void |
| 408 |
Send_With_Handling (NewSocket *ns, packet *msg) |
| 409 |
{ |
| 410 |
unsigned char sbuf[4]; |
| 411 |
|
| 412 |
if (ns->status == Ns_Dead || !msg) |
| 413 |
return; |
| 414 |
|
| 415 |
if (msg->length () >= MAXSOCKBUF) |
| 416 |
{ |
| 417 |
LOG (llevError, "Trying to send a buffer beyond properly size, len =%d\n", msg->length ()); |
| 418 |
/* Almost certainly we've overflowed a buffer, so quite now to make |
| 419 |
* it easier to debug. |
| 420 |
*/ |
| 421 |
abort (); |
| 422 |
} |
| 423 |
|
| 424 |
sbuf[0] = ((uint32) (msg->length ()) >> 8); |
| 425 |
sbuf[1] = ((uint32) (msg->length ()) ); |
| 426 |
|
| 427 |
if (ns->status != Ns_Old) |
| 428 |
ns->send (sbuf, 2); |
| 429 |
|
| 430 |
ns->send (msg->buf, msg->length ()); |
| 431 |
} |
| 432 |
|
| 433 |
/****************************************************************************** |
| 434 |
* |
| 435 |
* statistics logging functions. |
| 436 |
* |
| 437 |
******************************************************************************/ |
| 438 |
|
| 439 |
#ifdef CS_LOGSTATS |
| 440 |
|
| 441 |
/* cst_tot is for the life of the server, cst_last is for the last series of |
| 442 |
* stats |
| 443 |
*/ |
| 444 |
CS_Stats cst_tot, cst_lst; |
| 445 |
|
| 446 |
/** |
| 447 |
* Writes out the gathered stats. We clear cst_lst. |
| 448 |
*/ |
| 449 |
void |
| 450 |
write_cs_stats (void) |
| 451 |
{ |
| 452 |
time_t now = time (NULL); |
| 453 |
|
| 454 |
/* If no connections recently, don't both to log anything */ |
| 455 |
if (cst_lst.ibytes == 0 && cst_lst.obytes == 0) |
| 456 |
return; |
| 457 |
|
| 458 |
/* CSSTAT is put in so scripts can easily find the line */ |
| 459 |
LOG (llevInfo, "CSSTAT: %.16s tot %d %d %d %d inc %d %d %d %d\n", |
| 460 |
ctime (&now), cst_tot.ibytes, cst_tot.obytes, cst_tot.max_conn, |
| 461 |
now - cst_tot.time_start, cst_lst.ibytes, cst_lst.obytes, cst_lst.max_conn, now - cst_lst.time_start); |
| 462 |
cst_lst.ibytes = 0; |
| 463 |
cst_lst.obytes = 0; |
| 464 |
cst_lst.max_conn = socket_info.nconns; |
| 465 |
cst_lst.time_start = now; |
| 466 |
} |
| 467 |
#endif |
| 468 |
|
