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 | Copyright (C) 2003-2008 Marc Lehmann <gvpe@schmorp.de> |
4 | |
4 | |
5 | This file is part of GVPE. |
5 | This file is part of GVPE. |
6 | |
6 | |
7 | GVPE is free software; you can redistribute it and/or modify |
7 | GVPE is free software; you can redistribute it and/or modify it |
8 | 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 |
9 | the Free Software Foundation; either version 2 of the License, or |
9 | Free Software Foundation; either version 3 of the License, or (at your |
10 | (at your option) any later version. |
10 | option) any later version. |
11 | |
11 | |
12 | 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 |
13 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
13 | WITHOUT ANY WARRANTY; without even the implied warranty of |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General |
15 | GNU General Public License for more details. |
15 | Public License for more details. |
16 | |
16 | |
17 | 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 |
18 | along with gvpe; if not, write to the Free Software |
18 | with this program; if not, see <http://www.gnu.org/licenses/>. |
19 | Foundation, Inc. 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
19 | |
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20 | Additional permission under GNU GPL version 3 section 7 |
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21 | |
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22 | If you modify this Program, or any covered work, by linking or |
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23 | combining it with the OpenSSL project's OpenSSL library (or a modified |
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24 | version of that library), containing parts covered by the terms of the |
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25 | OpenSSL or SSLeay licenses, the licensors of this Program grant you |
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26 | additional permission to convey the resulting work. Corresponding |
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27 | Source for a non-source form of such a combination shall include the |
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28 | source code for the parts of OpenSSL used as well as that of the |
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29 | covered work. |
20 | */ |
30 | */ |
21 | |
31 | |
22 | #include "config.h" |
32 | #include "config.h" |
23 | |
33 | |
24 | #if ENABLE_TCP |
34 | #if ENABLE_TCP |
… | |
… | |
57 | { |
67 | { |
58 | return *a < *b; |
68 | return *a < *b; |
59 | } |
69 | } |
60 | }; |
70 | }; |
61 | |
71 | |
62 | struct tcp_si_map : public map<const sockinfo *, tcp_connection *, lt_sockinfo> { |
72 | struct tcp_si_map : public map<const sockinfo *, tcp_connection *, lt_sockinfo> |
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73 | { |
63 | void cleaner_cb (ev::timer &w, int revents); ev::timer cleaner; |
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) |
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67 | { |
77 | { |
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78 | ev_default_loop (0); |
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79 | cleaner.set<tcp_si_map, &tcp_si_map::cleaner_cb> (this); |
68 | cleaner.start (::conf.keepalive / 2, ::conf.keepalive / 2); |
80 | cleaner.start (::conf.keepalive / 2, ::conf.keepalive / 2); |
69 | } |
81 | } |
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82 | }; |
70 | |
83 | |
71 | } tcp_si; |
84 | static tcp_si_map tcp_si; |
72 | |
85 | |
73 | struct tcp_connection : ev::io { |
86 | struct tcp_connection : ev::io |
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87 | { |
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88 | int tos; |
74 | tstamp last_activity; |
89 | tstamp last_activity; |
75 | const sockinfo si; |
90 | const sockinfo si; |
76 | vpn &v; |
91 | vpn &v; |
77 | bool active; // this connection has been actively established |
92 | bool active; // this connection has been actively established |
78 | enum { ERROR, IDLE, CONNECTING, CONNECTING_PROXY, ESTABLISHED } state; |
93 | enum { ERROR, IDLE, CONNECTING, CONNECTING_PROXY, ESTABLISHED } state; |
… | |
… | |
86 | #if ENABLE_HTTP_PROXY |
101 | #if ENABLE_HTTP_PROXY |
87 | char *proxy_req; |
102 | char *proxy_req; |
88 | int proxy_req_len; |
103 | int proxy_req_len; |
89 | #endif |
104 | #endif |
90 | |
105 | |
91 | void tcpv4_ev (ev::io &w, int revents); |
106 | inline void tcpv4_ev (ev::io &w, int revents); |
92 | |
107 | |
93 | bool send_packet (vpn_packet *pkt, int tos); |
108 | bool send_packet (vpn_packet *pkt, int tos); |
94 | bool write_packet (); |
109 | bool write_packet (); |
95 | |
110 | |
96 | void error (); // abort conenction && cleanup |
111 | void error (); // abort conenction && cleanup |
… | |
… | |
102 | |
117 | |
103 | tcp_connection (int fd_, const sockinfo &si_, vpn &v_); |
118 | tcp_connection (int fd_, const sockinfo &si_, vpn &v_); |
104 | ~tcp_connection (); |
119 | ~tcp_connection (); |
105 | }; |
120 | }; |
106 | |
121 | |
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122 | void |
107 | void tcp_si_map::cleaner_cb (ev::timer &w, int revents) |
123 | tcp_si_map::cleaner_cb (ev::timer &w, int revents) |
108 | { |
124 | { |
109 | tstamp to = ev::ev_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 |
… | |
… | |
201 | } |
217 | } |
202 | |
218 | |
203 | void |
219 | void |
204 | tcp_connection::tcpv4_ev (ev::io &w, int revents) |
220 | tcp_connection::tcpv4_ev (ev::io &w, int revents) |
205 | { |
221 | { |
206 | last_activity = ev::ev_now (); |
222 | last_activity = ev_now (); |
207 | |
223 | |
208 | if (revents & EV_WRITE) |
224 | if (revents & EV_WRITE) |
209 | { |
225 | { |
210 | if (state == CONNECTING) |
226 | if (state == CONNECTING) |
211 | { |
227 | { |
… | |
… | |
346 | } |
362 | } |
347 | |
363 | |
348 | bool |
364 | bool |
349 | tcp_connection::send_packet (vpn_packet *pkt, int tos) |
365 | tcp_connection::send_packet (vpn_packet *pkt, int tos) |
350 | { |
366 | { |
351 | last_activity = ev::ev_now (); |
367 | last_activity = ev_now (); |
352 | |
368 | |
353 | if (state == IDLE) |
369 | if (state == IDLE) |
354 | { |
370 | { |
355 | // woaw, the first lost packet ;) |
371 | // woaw, the first lost packet ;) |
356 | fd = socket (PF_INET, SOCK_STREAM, IPPROTO_TCP); |
372 | fd = socket (PF_INET, SOCK_STREAM, IPPROTO_TCP); |
… | |
… | |
409 | if (!w_pkt) |
425 | if (!w_pkt) |
410 | { |
426 | { |
411 | // 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 |
412 | // and we don't care. at least we tried ;) |
428 | // and we don't care. at least we tried ;) |
413 | #if defined(SOL_IP) && defined(IP_TOS) |
429 | #if defined(SOL_IP) && defined(IP_TOS) |
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430 | if (tos != this->tos) |
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431 | { |
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432 | this->tos = tos; |
414 | setsockopt (fd, SOL_IP, IP_TOS, &tos, sizeof tos); |
433 | setsockopt (fd, SOL_IP, IP_TOS, &tos, sizeof tos); |
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434 | } |
415 | #endif |
435 | #endif |
416 | |
436 | |
417 | w_pkt = pkt; |
437 | w_pkt = pkt; |
418 | w_ofs = 0; |
438 | w_ofs = 0; |
419 | w_len = pkt->len + 2; // length + size header |
439 | w_len = pkt->len + 2; // length + size header |
… | |
… | |
431 | } |
451 | } |
432 | |
452 | |
433 | return state != ERROR; |
453 | return state != ERROR; |
434 | } |
454 | } |
435 | |
455 | |
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456 | void |
436 | void tcp_connection::error () |
457 | tcp_connection::error () |
437 | { |
458 | { |
438 | stop (); |
459 | stop (); |
439 | |
460 | |
440 | if (fd >= 0) |
461 | if (fd >= 0) |
441 | { |
462 | { |
442 | close (fd); |
463 | close (fd); |
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464 | tos = -1; |
443 | fd = -1; |
465 | fd = -1; |
444 | } |
466 | } |
445 | |
467 | |
446 | delete r_pkt; r_pkt = 0; |
468 | delete r_pkt; r_pkt = 0; |
447 | delete w_pkt; w_pkt = 0; |
469 | delete w_pkt; w_pkt = 0; |
448 | #if ENABLE_HTTP_PROXY |
470 | #if ENABLE_HTTP_PROXY |
… | |
… | |
451 | |
473 | |
452 | state = active ? IDLE : ERROR; |
474 | state = active ? IDLE : ERROR; |
453 | } |
475 | } |
454 | |
476 | |
455 | tcp_connection::tcp_connection (int fd_, const sockinfo &si_, vpn &v_) |
477 | tcp_connection::tcp_connection (int fd_, const sockinfo &si_, vpn &v_) |
456 | : v(v_), si(si_), ev::io(this, &tcp_connection::tcpv4_ev) |
478 | : v(v_), si(si_) |
457 | { |
479 | { |
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480 | set<tcp_connection, &tcp_connection::tcpv4_ev> (this); |
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481 | |
458 | last_activity = ev::ev_now (); |
482 | last_activity = ev_now (); |
459 | r_pkt = 0; |
483 | r_pkt = 0; |
460 | w_pkt = 0; |
484 | w_pkt = 0; |
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485 | tos = -1; |
461 | fd = fd_; |
486 | fd = fd_; |
462 | #if ENABLE_HTTP_PROXY |
487 | #if ENABLE_HTTP_PROXY |
463 | proxy_req = 0; |
488 | proxy_req = 0; |
464 | #endif |
489 | #endif |
465 | |
490 | |