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Comparing gvpe/src/vpn_tcp.C (file contents):
Revision 1.6 by pcg, Mon Apr 7 01:40:54 2003 UTC vs.
Revision 1.19 by pcg, Tue Nov 13 02:12:08 2007 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) 2003-2007 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
5 it under the terms of the GNU General Public License as published by 8 it under the terms of the GNU General Public License as published by
6 the Free Software Foundation; either version 2 of the License, or 9 the Free Software Foundation; either version 2 of the License, or
7 (at your option) any later version. 10 (at your 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,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of 13 but 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
12 GNU General Public License for more details. 15 GNU General 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
15 along with this program; if not, write to the Free Software 18 along with gvpe; if not, write to the Free Software
16 Foundation, Inc. 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 19 Foundation, Inc. 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
17*/ 20*/
18 21
19#include "config.h" 22#include "config.h"
20 23
21#if ENABLE_TCP 24#if ENABLE_TCP
22 25
23// tcp processing is extremely ugly, since the vpe protocol is simply 26// tcp processing is extremely ugly, since the gvpe protocol is simply
24// designed for unreliable datagram networks. tcp is implemented by 27// designed for unreliable datagram networks. tcp is implemented by
25// multiplexing packets over tcp. errors are completely ignored, as we 28// multiplexing packets over tcp. errors are completely ignored, as we
26// rely on the higher level protocol to time out and reconnect. 29// rely on the higher level layers to time out and reconnect.
27 30
28#include <cstring> 31#include <cstring>
29 32
30#include <sys/types.h> 33#include <sys/types.h>
31#include <sys/socket.h> 34#include <sys/socket.h>
32#include <sys/poll.h>
33#include <sys/wait.h> 35#include <sys/wait.h>
34#include <netinet/in.h>
35#include <sys/uio.h> 36#include <sys/uio.h>
36#include <arpa/inet.h>
37#include <errno.h> 37#include <errno.h>
38#include <time.h> 38#include <time.h>
39#include <unistd.h> 39#include <unistd.h>
40#include <fcntl.h>
40 41
41#include <map> 42#include <map>
42#include <unistd.h> 43
43#include <fcntl.h> 44#include "netcompat.h"
44#include <sys/poll.h>
45 45
46#include "vpn.h" 46#include "vpn.h"
47 47
48#if ENABLE_HTTP_PROXY 48#if ENABLE_HTTP_PROXY
49# include "conf.h" 49# include "conf.h"
… …
58 return *a < *b; 58 return *a < *b;
59 } 59 }
60}; 60};
61 61
62struct tcp_si_map : public map<const sockinfo *, tcp_connection *, lt_sockinfo> { 62struct tcp_si_map : public map<const sockinfo *, tcp_connection *, lt_sockinfo> {
63 void cleaner_cb (time_watcher &w); time_watcher cleaner; 63 void cleaner_cb (ev::timer &w, int revents); ev::timer cleaner;
64 64
65 tcp_si_map () 65 tcp_si_map ()
66 : cleaner(this, &tcp_si_map::cleaner_cb) 66 : cleaner(this, &tcp_si_map::cleaner_cb)
67 { 67 {
68 cleaner.start (0); 68 cleaner.start (::conf.keepalive / 2, ::conf.keepalive / 2);
69 } 69 }
70
70} tcp_si; 71} tcp_si;
71 72
72struct tcp_connection : io_watcher { 73struct tcp_connection : ev::io {
73 tstamp last_activity; 74 tstamp last_activity;
74 const sockinfo si; 75 const sockinfo si;
75 vpn &v; 76 vpn &v;
76 bool active; // this connection has been actively established 77 bool active; // this connection has been actively established
77 enum { ERROR, IDLE, CONNECTING, CONNECTING_PROXY, ESTABLISHED } state; 78 enum { ERROR, IDLE, CONNECTING, CONNECTING_PROXY, ESTABLISHED } state;
… …
85#if ENABLE_HTTP_PROXY 86#if ENABLE_HTTP_PROXY
86 char *proxy_req; 87 char *proxy_req;
87 int proxy_req_len; 88 int proxy_req_len;
88#endif 89#endif
89 90
90 void tcpv4_ev (io_watcher &w, short revents); 91 void tcpv4_ev (ev::io &w, int revents);
91 92
92 bool send_packet (vpn_packet *pkt, int tos); 93 bool send_packet (vpn_packet *pkt, int tos);
93 bool write_packet (); 94 bool write_packet ();
94 95
95 void error (); // abort conenction && cleanup 96 void error (); // abort conenction && cleanup
96 97
97 operator tcp_si_map::value_type() 98 operator tcp_si_map::value_type()
98 { 99 {
99 return tcp_si_map::value_type (&si, this); 100 return tcp_si_map::value_type (&si, this);
100 } 101 }
101 102
102 tcp_connection (int fd_, const sockinfo &si_, vpn &v_); 103 tcp_connection (int fd_, const sockinfo &si_, vpn &v_);
103 ~tcp_connection (); 104 ~tcp_connection ();
104}; 105};
105 106
106void tcp_si_map::cleaner_cb (time_watcher &w) 107void tcp_si_map::cleaner_cb (ev::timer &w, int revents)
107{ 108{
108 w.at = NOW + 600;
109 tstamp to = NOW - ::conf.keepalive - 30 - 60; 109 tstamp to = ev::ev_now () - ::conf.keepalive - 30 - 60;
110 110
111 for (iterator i = begin (); i != end(); ) 111 for (iterator i = begin (); i != end(); )
112 if (i->second->last_activity >= to) 112 if (i->second->last_activity >= to)
113 ++i; 113 ++i;
114 else 114 else
115 { 115 {
116 delete i->second;
116 erase (i); 117 erase (i);
117 i = begin (); 118 i = begin ();
118 } 119 }
119} 120}
120 121
121void 122void
122vpn::tcpv4_ev (io_watcher &w, short revents) 123vpn::tcpv4_ev (ev::io &w, int revents)
123{ 124{
124 if (revents & (POLLIN | POLLERR)) 125 if (revents & EV_READ)
125 { 126 {
126 struct sockaddr_in sa; 127 struct sockaddr_in sa;
127 socklen_t sa_len = sizeof (sa); 128 socklen_t sa_len = sizeof (sa);
128 int len; 129 int len;
129 130
130 int fd = accept (w.fd, (sockaddr *)&sa, &sa_len); 131 int fd = accept (w.fd, (sockaddr *)&sa, &sa_len);
131 132
132 if (fd >= 0) 133 if (fd >= 0)
133 { 134 {
135 fcntl (fd, F_SETFL, O_NONBLOCK);
136 fcntl (fd, F_SETFD, FD_CLOEXEC);
137
134 sockinfo si(sa, PROT_TCPv4); 138 sockinfo si(sa, PROT_TCPv4);
135 139
136 slog (L_DEBUG, _("%s: accepted tcp connection"), (const char *)si);//D 140 slog (L_DEBUG, _("%s: accepted tcp connection"), (const char *)si);//D
137
138 fcntl (fd, F_SETFL, O_NONBLOCK);
139 141
140 tcp_connection *i = new tcp_connection (fd, si, *this); 142 tcp_connection *i = new tcp_connection (fd, si, *this);
141 tcp_si.insert (*i); 143 tcp_si.insert (*i);
142 } 144 }
143 } 145 }
… …
169 if (w_ofs < 2) 171 if (w_ofs < 2)
170 { 172 {
171 u16 plen = htons (w_pkt->len); 173 u16 plen = htons (w_pkt->len);
172 174
173 iovec vec[2]; 175 iovec vec[2];
176 //TODO: char* is the right type? hardly...
174 vec[0].iov_base = ((u8 *)&plen) + w_ofs; 177 vec[0].iov_base = (char *)((u8 *)&plen) + w_ofs;
175 vec[0].iov_len = 2 - w_ofs; 178 vec[0].iov_len = 2 - w_ofs;
176 vec[1].iov_base = &((*w_pkt)[0]); 179 vec[1].iov_base = (char *)&((*w_pkt)[0]);
177 vec[1].iov_len = w_len - 2; 180 vec[1].iov_len = w_len - 2;
178 181
179 len = writev (fd, vec, 2); 182 len = writev (fd, vec, 2);
180 } 183 }
181 else 184 else
… …
196 return false; 199 return false;
197 } 200 }
198} 201}
199 202
200void 203void
201tcp_connection::tcpv4_ev (io_watcher &w, short revents) 204tcp_connection::tcpv4_ev (ev::io &w, int revents)
202{ 205{
203 last_activity = NOW; 206 last_activity = ev::ev_now ();
204 207
205 if (revents & (POLLERR | POLLHUP)) 208 if (revents & EV_WRITE)
206 {
207 error ();
208 return;
209 }
210
211 if (revents & POLLOUT)
212 { 209 {
213 if (state == CONNECTING) 210 if (state == CONNECTING)
214 { 211 {
215 state = ESTABLISHED; 212 state = ESTABLISHED;
216 set (POLLIN); 213 set (EV_READ);
217#if ENABLE_HTTP_PROXY 214#if ENABLE_HTTP_PROXY
218 if (::conf.proxy_host && ::conf.proxy_port) 215 if (::conf.proxy_host && ::conf.proxy_port)
219 { 216 {
220 state = CONNECTING_PROXY; 217 state = CONNECTING_PROXY;
218
221 write (fd, proxy_req, proxy_req_len); 219 if (write (fd, proxy_req, proxy_req_len) == 0)
220 {
221 error ();
222 return;
223 }
224
222 free (proxy_req); proxy_req = 0; 225 free (proxy_req); proxy_req = 0;
223 } 226 }
224#endif 227#endif
225 } 228 }
226 else if (state == ESTABLISHED) 229 else if (state == ESTABLISHED)
… …
229 { 232 {
230 if (write_packet ()) 233 if (write_packet ())
231 { 234 {
232 delete w_pkt; w_pkt = 0; 235 delete w_pkt; w_pkt = 0;
233 236
234 set (POLLIN); 237 set (EV_READ);
235 } 238 }
236 } 239 }
237 else 240 else
238 set (POLLIN); 241 set (EV_READ);
239 } 242 }
240 else 243 else
241 set (POLLIN); 244 set (EV_READ);
242 } 245 }
243 246
244 if (revents & POLLIN) 247 if (revents & EV_READ)
245 { 248 {
246 if (state == ESTABLISHED) 249 if (state == ESTABLISHED)
247 for (;;) 250 for (;;)
248 { 251 {
249 if (!r_pkt) 252 if (!r_pkt)
… …
283 break; 286 break;
284 } 287 }
285 else if (len < 0 && (errno == EINTR || errno == EAGAIN)) 288 else if (len < 0 && (errno == EINTR || errno == EAGAIN))
286 break; 289 break;
287 290
291 // len == 0 <-> EOF
288 error (); 292 error ();
289 break; 293 break;
290 } 294 }
291#if ENABLE_HTTP_PROXY 295#if ENABLE_HTTP_PROXY
292 else if (state == CONNECTING_PROXY) 296 else if (state == CONNECTING_PROXY)
… …
342} 346}
343 347
344bool 348bool
345tcp_connection::send_packet (vpn_packet *pkt, int tos) 349tcp_connection::send_packet (vpn_packet *pkt, int tos)
346{ 350{
347 last_activity = NOW; 351 last_activity = ev::ev_now ();
348 352
349 if (state == IDLE) 353 if (state == IDLE)
350 { 354 {
351 // woaw, the first lost packet ;) 355 // woaw, the first lost packet ;)
352 fd = socket (PF_INET, SOCK_STREAM, IPPROTO_TCP); 356 fd = socket (PF_INET, SOCK_STREAM, IPPROTO_TCP);
… …
386 fcntl (fd, F_SETFL, O_NONBLOCK); 390 fcntl (fd, F_SETFL, O_NONBLOCK);
387 391
388 if (connect (fd, csi->sav4 (), csi->salenv4 ()) >= 0 392 if (connect (fd, csi->sav4 (), csi->salenv4 ()) >= 0
389 || errno == EINPROGRESS) 393 || errno == EINPROGRESS)
390 { 394 {
395 fcntl (fd, F_SETFL, O_NONBLOCK);
396 fcntl (fd, F_SETFD, FD_CLOEXEC);
397
391 state = CONNECTING; 398 state = CONNECTING;
392 start (fd, POLLOUT); 399 start (fd, EV_WRITE);
393 } 400 }
394 else 401 else
395 close (fd); 402 close (fd);
396 } 403 }
397 } 404 }
… …
401 // right thing to do, not using tcp *is* the right thing to do. 408 // right thing to do, not using tcp *is* the right thing to do.
402 if (!w_pkt) 409 if (!w_pkt)
403 { 410 {
404 // how this maps to the underlying tcp packets we don't know 411 // how this maps to the underlying tcp packets we don't know
405 // and we don't care. at least we tried ;) 412 // and we don't care. at least we tried ;)
413#if defined(SOL_IP) && defined(IP_TOS)
406 setsockopt (fd, SOL_IP, IP_TOS, &tos, sizeof tos); 414 setsockopt (fd, SOL_IP, IP_TOS, &tos, sizeof tos);
415#endif
407 416
408 w_pkt = pkt; 417 w_pkt = pkt;
409 w_ofs = 0; 418 w_ofs = 0;
410 w_len = pkt->len + 2; // length + size header 419 w_len = pkt->len + 2; // length + size header
411 420
… …
414 else 423 else
415 { 424 {
416 w_pkt = new vpn_packet; 425 w_pkt = new vpn_packet;
417 w_pkt->set (*pkt); 426 w_pkt->set (*pkt);
418 427
419 set (POLLIN | POLLOUT); 428 set (EV_READ | EV_WRITE);
420 } 429 }
421 } 430 }
422 } 431 }
423 432
424 return state != ERROR; 433 return state != ERROR;
425} 434}
426 435
427void tcp_connection::error () 436void tcp_connection::error ()
428{ 437{
438 stop ();
439
429 if (fd >= 0) 440 if (fd >= 0)
430 { 441 {
431 close (fd); 442 close (fd);
432 fd = -1; 443 fd = -1;
433 } 444 }
… …
436 delete w_pkt; w_pkt = 0; 447 delete w_pkt; w_pkt = 0;
437#if ENABLE_HTTP_PROXY 448#if ENABLE_HTTP_PROXY
438 free (proxy_req); proxy_req = 0; 449 free (proxy_req); proxy_req = 0;
439#endif 450#endif
440 451
441 stop ();
442 state = active ? IDLE : ERROR; 452 state = active ? IDLE : ERROR;
443} 453}
444 454
445tcp_connection::tcp_connection (int fd_, const sockinfo &si_, vpn &v_) 455tcp_connection::tcp_connection (int fd_, const sockinfo &si_, vpn &v_)
446: v(v_), si(si_), io_watcher(this, &tcp_connection::tcpv4_ev) 456: v(v_), si(si_), ev::io(this, &tcp_connection::tcpv4_ev)
447{ 457{
448 last_activity = NOW; 458 last_activity = ev::ev_now ();
449 r_pkt = 0; 459 r_pkt = 0;
450 w_pkt = 0; 460 w_pkt = 0;
451 fd = fd_; 461 fd = fd_;
452#if ENABLE_HTTP_PROXY 462#if ENABLE_HTTP_PROXY
453 proxy_req = 0; 463 proxy_req = 0;
… …
460 } 470 }
461 else 471 else
462 { 472 {
463 active = false; 473 active = false;
464 state = ESTABLISHED; 474 state = ESTABLISHED;
465 start (fd, POLLIN); 475 start (fd, EV_READ);
466 } 476 }
467} 477}
468 478
469tcp_connection::~tcp_connection () 479tcp_connection::~tcp_connection ()
470{ 480{

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