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Comparing gvpe/src/vpn_tcp.C (file contents):
Revision 1.7 by pcg, Tue Oct 14 03:22:09 2003 UTC vs.
Revision 1.27 by root, Tue Feb 8 23:11:36 2011 UTC

1/* 1/*
2 vpn_tcp.C -- handle the tcp part of the protocol. 2 vpn_tcp.C -- handle the tcp part of the protocol.
3 Copyright (C) 2003-2008 Marc Lehmann <gvpe@schmorp.de>
3 4
5 This file is part of GVPE.
6
4 This program is free software; you can redistribute it and/or modify 7 GVPE is free software; you can redistribute it and/or modify it
5 it under the terms of the GNU General Public License as published by 8 under the terms of the GNU General Public License as published by the
6 the Free Software Foundation; either version 2 of the License, or 9 Free Software Foundation; either version 3 of the License, or (at your
7 (at your option) any later version. 10 option) any later version.
8 11
9 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, but
10 but WITHOUT ANY WARRANTY; without even the implied warranty of 13 WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
12 GNU General Public License for more details. 15 Public License for more details.
13 16
14 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 along
15 along with this program; if not, write to the Free Software 18 with this program; if not, see <http://www.gnu.org/licenses/>.
16 Foundation, Inc. 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 19
20 Additional permission under GNU GPL version 3 section 7
21
22 If you modify this Program, or any covered work, by linking or
23 combining it with the OpenSSL project's OpenSSL library (or a modified
24 version of that library), containing parts covered by the terms of the
25 OpenSSL or SSLeay licenses, the licensors of this Program grant you
26 additional permission to convey the resulting work. Corresponding
27 Source for a non-source form of such a combination shall include the
28 source code for the parts of OpenSSL used as well as that of the
29 covered work.
17*/ 30*/
18 31
19#include "config.h" 32#include "config.h"
20 33
21#if ENABLE_TCP 34#if ENABLE_TCP
22 35
23// tcp processing is extremely ugly, since the vpe protocol is simply 36// tcp processing is extremely ugly, since the gvpe protocol is simply
24// designed for unreliable datagram networks. tcp is implemented by 37// designed for unreliable datagram networks. tcp is implemented by
25// multiplexing packets over tcp. errors are completely ignored, as we 38// multiplexing packets over tcp. errors are completely ignored, as we
26// rely on the higher level protocol to time out and reconnect. 39// rely on the higher level layers to time out and reconnect.
27 40
28#include <cstring> 41#include <cstring>
29 42
30#include <sys/types.h> 43#include <sys/types.h>
31#include <sys/socket.h> 44#include <sys/socket.h>
32#include <sys/poll.h>
33#include <sys/wait.h> 45#include <sys/wait.h>
34#include <netinet/in.h>
35#include <sys/uio.h> 46#include <sys/uio.h>
36#include <arpa/inet.h>
37#include <errno.h> 47#include <errno.h>
38#include <time.h> 48#include <time.h>
39#include <unistd.h> 49#include <unistd.h>
50#include <fcntl.h>
40 51
41#include <map> 52#include <map>
42#include <unistd.h> 53
43#include <fcntl.h> 54#include "netcompat.h"
44#include <sys/poll.h>
45 55
46#include "vpn.h" 56#include "vpn.h"
47 57
48#if ENABLE_HTTP_PROXY 58#if ENABLE_HTTP_PROXY
49# include "conf.h" 59# include "conf.h"
… …
57 { 67 {
58 return *a < *b; 68 return *a < *b;
59 } 69 }
60}; 70};
61 71
62struct tcp_si_map : public map<const sockinfo *, tcp_connection *, lt_sockinfo> { 72struct tcp_si_map : public map<const sockinfo *, tcp_connection *, lt_sockinfo>
63 void cleaner_cb (time_watcher &w); time_watcher cleaner; 73{
74 inline void cleaner_cb (ev::timer &w, int revents); ev::timer cleaner;
64 75
65 tcp_si_map () 76 tcp_si_map ()
66 : cleaner(this, &tcp_si_map::cleaner_cb)
67 { 77 {
68 cleaner.start (0); 78 ev_default_loop (0);
79 cleaner.set<tcp_si_map, &tcp_si_map::cleaner_cb> (this);
80 cleaner.start (::conf.keepalive / 2, ::conf.keepalive / 2);
69 } 81 }
70} tcp_si; 82};
71 83
84static tcp_si_map tcp_si;
85
72struct tcp_connection : io_watcher { 86struct tcp_connection : ev::io
87{
88 int tos;
73 tstamp last_activity; 89 tstamp last_activity;
74 const sockinfo si; 90 const sockinfo si;
75 vpn &v; 91 vpn &v;
76 bool active; // this connection has been actively established 92 bool active; // this connection has been actively established
77 enum { ERROR, IDLE, CONNECTING, CONNECTING_PROXY, ESTABLISHED } state; 93 enum { ERROR, IDLE, CONNECTING, CONNECTING_PROXY, ESTABLISHED } state;
… …
85#if ENABLE_HTTP_PROXY 101#if ENABLE_HTTP_PROXY
86 char *proxy_req; 102 char *proxy_req;
87 int proxy_req_len; 103 int proxy_req_len;
88#endif 104#endif
89 105
90 void tcpv4_ev (io_watcher &w, short revents); 106 inline void tcpv4_ev (ev::io &w, int revents);
91 107
92 bool send_packet (vpn_packet *pkt, int tos); 108 bool send_packet (vpn_packet *pkt, int tos);
93 bool write_packet (); 109 bool write_packet ();
94 110
95 void error (); // abort conenction && cleanup 111 void error (); // abort conenction && cleanup
96 112
97 operator tcp_si_map::value_type() 113 operator tcp_si_map::value_type()
98 { 114 {
99 return tcp_si_map::value_type (&si, this); 115 return tcp_si_map::value_type (&si, this);
100 } 116 }
101 117
102 tcp_connection (int fd_, const sockinfo &si_, vpn &v_); 118 tcp_connection (int fd_, const sockinfo &si_, vpn &v_);
103 ~tcp_connection (); 119 ~tcp_connection ();
104}; 120};
105 121
106void tcp_si_map::cleaner_cb (time_watcher &w) 122void
123tcp_si_map::cleaner_cb (ev::timer &w, int revents)
107{ 124{
108 w.at = NOW + 600;
109 tstamp to = NOW - ::conf.keepalive - 30 - 60; 125 tstamp to = ev_now () - ::conf.keepalive - 30 - 60;
110 126
111 for (iterator i = begin (); i != end(); ) 127 for (iterator i = begin (); i != end(); )
112 if (i->second->last_activity >= to) 128 if (i->second->last_activity >= to)
113 ++i; 129 ++i;
114 else 130 else
115 { 131 {
132 delete i->second;
116 erase (i); 133 erase (i);
117 i = begin (); 134 i = begin ();
118 } 135 }
119} 136}
120 137
121void 138void
122vpn::tcpv4_ev (io_watcher &w, short revents) 139vpn::tcpv4_ev (ev::io &w, int revents)
123{ 140{
124 if (revents & (POLLIN | POLLERR)) 141 if (revents & EV_READ)
125 { 142 {
126 struct sockaddr_in sa; 143 struct sockaddr_in sa;
127 socklen_t sa_len = sizeof (sa); 144 socklen_t sa_len = sizeof (sa);
128 int len; 145 int len;
129 146
130 int fd = accept (w.fd, (sockaddr *)&sa, &sa_len); 147 int fd = accept (w.fd, (sockaddr *)&sa, &sa_len);
131 148
132 if (fd >= 0) 149 if (fd >= 0)
133 { 150 {
151 fcntl (fd, F_SETFL, O_NONBLOCK);
152 fcntl (fd, F_SETFD, FD_CLOEXEC);
153
134 sockinfo si(sa, PROT_TCPv4); 154 sockinfo si(sa, PROT_TCPv4);
135 155
136 slog (L_DEBUG, _("%s: accepted tcp connection"), (const char *)si);//D 156 slog (L_DEBUG, _("%s: accepted tcp connection"), (const char *)si);//D
137
138 fcntl (fd, F_SETFL, O_NONBLOCK);
139 157
140 tcp_connection *i = new tcp_connection (fd, si, *this); 158 tcp_connection *i = new tcp_connection (fd, si, *this);
141 tcp_si.insert (*i); 159 tcp_si.insert (*i);
142 } 160 }
143 } 161 }
… …
197 return false; 215 return false;
198 } 216 }
199} 217}
200 218
201void 219void
202tcp_connection::tcpv4_ev (io_watcher &w, short revents) 220tcp_connection::tcpv4_ev (ev::io &w, int revents)
203{ 221{
204 last_activity = NOW; 222 last_activity = ev_now ();
205 223
206 if (revents & (POLLERR | POLLHUP)) 224 if (revents & EV_WRITE)
207 {
208 error ();
209 return;
210 }
211
212 if (revents & POLLOUT)
213 { 225 {
214 if (state == CONNECTING) 226 if (state == CONNECTING)
215 { 227 {
216 state = ESTABLISHED; 228 state = ESTABLISHED;
217 set (POLLIN); 229 set (EV_READ);
218#if ENABLE_HTTP_PROXY 230#if ENABLE_HTTP_PROXY
219 if (::conf.proxy_host && ::conf.proxy_port) 231 if (::conf.proxy_host && ::conf.proxy_port)
220 { 232 {
221 state = CONNECTING_PROXY; 233 state = CONNECTING_PROXY;
234
222 write (fd, proxy_req, proxy_req_len); 235 if (write (fd, proxy_req, proxy_req_len) == 0)
236 {
237 error ();
238 return;
239 }
240
223 free (proxy_req); proxy_req = 0; 241 free (proxy_req); proxy_req = 0;
224 } 242 }
225#endif 243#endif
226 } 244 }
227 else if (state == ESTABLISHED) 245 else if (state == ESTABLISHED)
… …
230 { 248 {
231 if (write_packet ()) 249 if (write_packet ())
232 { 250 {
233 delete w_pkt; w_pkt = 0; 251 delete w_pkt; w_pkt = 0;
234 252
235 set (POLLIN); 253 set (EV_READ);
236 } 254 }
237 } 255 }
238 else 256 else
239 set (POLLIN); 257 set (EV_READ);
240 } 258 }
241 else 259 else
242 set (POLLIN); 260 set (EV_READ);
243 } 261 }
244 262
245 if (revents & POLLIN) 263 if (revents & EV_READ)
246 { 264 {
247 if (state == ESTABLISHED) 265 if (state == ESTABLISHED)
248 for (;;) 266 for (;;)
249 { 267 {
250 if (!r_pkt) 268 if (!r_pkt)
… …
284 break; 302 break;
285 } 303 }
286 else if (len < 0 && (errno == EINTR || errno == EAGAIN)) 304 else if (len < 0 && (errno == EINTR || errno == EAGAIN))
287 break; 305 break;
288 306
307 // len == 0 <-> EOF
289 error (); 308 error ();
290 break; 309 break;
291 } 310 }
292#if ENABLE_HTTP_PROXY 311#if ENABLE_HTTP_PROXY
293 else if (state == CONNECTING_PROXY) 312 else if (state == CONNECTING_PROXY)
… …
343} 362}
344 363
345bool 364bool
346tcp_connection::send_packet (vpn_packet *pkt, int tos) 365tcp_connection::send_packet (vpn_packet *pkt, int tos)
347{ 366{
348 last_activity = NOW; 367 last_activity = ev_now ();
349 368
350 if (state == IDLE) 369 if (state == IDLE)
351 { 370 {
352 // woaw, the first lost packet ;) 371 // woaw, the first lost packet ;)
353 fd = socket (PF_INET, SOCK_STREAM, IPPROTO_TCP); 372 fd = socket (PF_INET, SOCK_STREAM, IPPROTO_TCP);
… …
387 fcntl (fd, F_SETFL, O_NONBLOCK); 406 fcntl (fd, F_SETFL, O_NONBLOCK);
388 407
389 if (connect (fd, csi->sav4 (), csi->salenv4 ()) >= 0 408 if (connect (fd, csi->sav4 (), csi->salenv4 ()) >= 0
390 || errno == EINPROGRESS) 409 || errno == EINPROGRESS)
391 { 410 {
411 fcntl (fd, F_SETFL, O_NONBLOCK);
412 fcntl (fd, F_SETFD, FD_CLOEXEC);
413
392 state = CONNECTING; 414 state = CONNECTING;
393 start (fd, POLLOUT); 415 start (fd, EV_WRITE);
394 } 416 }
395 else 417 else
396 close (fd); 418 close (fd);
397 } 419 }
398 } 420 }
… …
403 if (!w_pkt) 425 if (!w_pkt)
404 { 426 {
405 // how this maps to the underlying tcp packets we don't know 427 // how this maps to the underlying tcp packets we don't know
406 // and we don't care. at least we tried ;) 428 // and we don't care. at least we tried ;)
407#if defined(SOL_IP) && defined(IP_TOS) 429#if defined(SOL_IP) && defined(IP_TOS)
430 if (tos != this->tos)
431 {
432 this->tos = tos;
408 setsockopt (fd, SOL_IP, IP_TOS, &tos, sizeof tos); 433 setsockopt (fd, SOL_IP, IP_TOS, &tos, sizeof tos);
434 }
409#endif 435#endif
410 436
411 w_pkt = pkt; 437 w_pkt = pkt;
412 w_ofs = 0; 438 w_ofs = 0;
413 w_len = pkt->len + 2; // length + size header 439 w_len = pkt->len + 2; // length + size header
… …
417 else 443 else
418 { 444 {
419 w_pkt = new vpn_packet; 445 w_pkt = new vpn_packet;
420 w_pkt->set (*pkt); 446 w_pkt->set (*pkt);
421 447
422 set (POLLIN | POLLOUT); 448 set (EV_READ | EV_WRITE);
423 } 449 }
424 } 450 }
425 } 451 }
426 452
427 return state != ERROR; 453 return state != ERROR;
428} 454}
429 455
456void
430void tcp_connection::error () 457tcp_connection::error ()
431{ 458{
459 stop ();
460
432 if (fd >= 0) 461 if (fd >= 0)
433 { 462 {
434 close (fd); 463 close (fd);
464 tos = -1;
435 fd = -1; 465 fd = -1;
436 } 466 }
437 467
438 delete r_pkt; r_pkt = 0; 468 delete r_pkt; r_pkt = 0;
439 delete w_pkt; w_pkt = 0; 469 delete w_pkt; w_pkt = 0;
440#if ENABLE_HTTP_PROXY 470#if ENABLE_HTTP_PROXY
441 free (proxy_req); proxy_req = 0; 471 free (proxy_req); proxy_req = 0;
442#endif 472#endif
443 473
444 stop ();
445 state = active ? IDLE : ERROR; 474 state = active ? IDLE : ERROR;
446} 475}
447 476
448tcp_connection::tcp_connection (int fd_, const sockinfo &si_, vpn &v_) 477tcp_connection::tcp_connection (int fd_, const sockinfo &si_, vpn &v_)
449: v(v_), si(si_), io_watcher(this, &tcp_connection::tcpv4_ev) 478: v(v_), si(si_)
450{ 479{
480 set<tcp_connection, &tcp_connection::tcpv4_ev> (this);
481
451 last_activity = NOW; 482 last_activity = ev_now ();
452 r_pkt = 0; 483 r_pkt = 0;
453 w_pkt = 0; 484 w_pkt = 0;
485 tos = -1;
454 fd = fd_; 486 fd = fd_;
455#if ENABLE_HTTP_PROXY 487#if ENABLE_HTTP_PROXY
456 proxy_req = 0; 488 proxy_req = 0;
457#endif 489#endif
458 490
… …
463 } 495 }
464 else 496 else
465 { 497 {
466 active = false; 498 active = false;
467 state = ESTABLISHED; 499 state = ESTABLISHED;
468 start (fd, POLLIN); 500 start (fd, EV_READ);
469 } 501 }
470} 502}
471 503
472tcp_connection::~tcp_connection () 504tcp_connection::~tcp_connection ()
473{ 505{

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