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) 2003-2005 Marc Lehmann <gvpe@schmorp.de> |
3 | Copyright (C) 2003-2007 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 |
8 | 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 |
… | |
… | |
21 | |
21 | |
22 | #include "config.h" |
22 | #include "config.h" |
23 | |
23 | |
24 | #if ENABLE_TCP |
24 | #if ENABLE_TCP |
25 | |
25 | |
26 | // tcp processing is extremely ugly, since the vpe protocol is simply |
26 | // tcp processing is extremely ugly, since the gvpe protocol is simply |
27 | // designed for unreliable datagram networks. tcp is implemented by |
27 | // designed for unreliable datagram networks. tcp is implemented by |
28 | // multiplexing packets over tcp. errors are completely ignored, as we |
28 | // multiplexing packets over tcp. errors are completely ignored, as we |
29 | // rely on the higher level protocol to time out and reconnect. |
29 | // rely on the higher level layers to time out and reconnect. |
30 | |
30 | |
31 | #include <cstring> |
31 | #include <cstring> |
32 | |
32 | |
33 | #include <sys/types.h> |
33 | #include <sys/types.h> |
34 | #include <sys/socket.h> |
34 | #include <sys/socket.h> |
… | |
… | |
57 | { |
57 | { |
58 | return *a < *b; |
58 | return *a < *b; |
59 | } |
59 | } |
60 | }; |
60 | }; |
61 | |
61 | |
62 | struct tcp_si_map : public map<const sockinfo *, tcp_connection *, lt_sockinfo> { |
62 | struct tcp_si_map : public map<const sockinfo *, tcp_connection *, lt_sockinfo> |
|
|
63 | { |
63 | void cleaner_cb (ev::timer &w, int revents); ev::timer cleaner; |
64 | void cleaner_cb (ev::timer &w, int revents); ev::timer cleaner; |
64 | |
65 | |
65 | tcp_si_map () |
66 | tcp_si_map () |
66 | : cleaner(this, &tcp_si_map::cleaner_cb) |
67 | : cleaner(this, &tcp_si_map::cleaner_cb) |
67 | { |
68 | { |
68 | cleaner.start (300, 300); |
69 | cleaner.start (::conf.keepalive / 2, ::conf.keepalive / 2); |
69 | } |
70 | } |
70 | |
71 | |
71 | } tcp_si; |
72 | } tcp_si; |
72 | |
73 | |
73 | struct tcp_connection : ev::io { |
74 | struct tcp_connection : ev::io |
|
|
75 | { |
|
|
76 | int tos; |
74 | tstamp last_activity; |
77 | tstamp last_activity; |
75 | const sockinfo si; |
78 | const sockinfo si; |
76 | vpn &v; |
79 | vpn &v; |
77 | bool active; // this connection has been actively established |
80 | bool active; // this connection has been actively established |
78 | enum { ERROR, IDLE, CONNECTING, CONNECTING_PROXY, ESTABLISHED } state; |
81 | enum { ERROR, IDLE, CONNECTING, CONNECTING_PROXY, ESTABLISHED } state; |
… | |
… | |
104 | ~tcp_connection (); |
107 | ~tcp_connection (); |
105 | }; |
108 | }; |
106 | |
109 | |
107 | void tcp_si_map::cleaner_cb (ev::timer &w, int revents) |
110 | void tcp_si_map::cleaner_cb (ev::timer &w, int revents) |
108 | { |
111 | { |
109 | tstamp to = ev::ev_now () - ::conf.keepalive - 30 - 60; |
112 | tstamp to = ev_now () - ::conf.keepalive - 30 - 60; |
110 | |
113 | |
111 | for (iterator i = begin (); i != end(); ) |
114 | for (iterator i = begin (); i != end(); ) |
112 | if (i->second->last_activity >= to) |
115 | if (i->second->last_activity >= to) |
113 | ++i; |
116 | ++i; |
114 | else |
117 | else |
115 | { |
118 | { |
|
|
119 | delete i->second; |
116 | erase (i); |
120 | erase (i); |
117 | i = begin (); |
121 | i = begin (); |
118 | } |
122 | } |
119 | } |
123 | } |
120 | |
124 | |
… | |
… | |
200 | } |
204 | } |
201 | |
205 | |
202 | void |
206 | void |
203 | tcp_connection::tcpv4_ev (ev::io &w, int revents) |
207 | tcp_connection::tcpv4_ev (ev::io &w, int revents) |
204 | { |
208 | { |
205 | last_activity = ev::ev_now (); |
209 | last_activity = ev_now (); |
206 | |
210 | |
207 | if (revents & EV_WRITE) |
211 | if (revents & EV_WRITE) |
208 | { |
212 | { |
209 | if (state == CONNECTING) |
213 | if (state == CONNECTING) |
210 | { |
214 | { |
… | |
… | |
345 | } |
349 | } |
346 | |
350 | |
347 | bool |
351 | bool |
348 | tcp_connection::send_packet (vpn_packet *pkt, int tos) |
352 | tcp_connection::send_packet (vpn_packet *pkt, int tos) |
349 | { |
353 | { |
350 | last_activity = ev::ev_now (); |
354 | last_activity = ev_now (); |
351 | |
355 | |
352 | if (state == IDLE) |
356 | if (state == IDLE) |
353 | { |
357 | { |
354 | // woaw, the first lost packet ;) |
358 | // woaw, the first lost packet ;) |
355 | fd = socket (PF_INET, SOCK_STREAM, IPPROTO_TCP); |
359 | fd = socket (PF_INET, SOCK_STREAM, IPPROTO_TCP); |
… | |
… | |
408 | if (!w_pkt) |
412 | if (!w_pkt) |
409 | { |
413 | { |
410 | // how this maps to the underlying tcp packets we don't know |
414 | // how this maps to the underlying tcp packets we don't know |
411 | // and we don't care. at least we tried ;) |
415 | // and we don't care. at least we tried ;) |
412 | #if defined(SOL_IP) && defined(IP_TOS) |
416 | #if defined(SOL_IP) && defined(IP_TOS) |
|
|
417 | if (tos != this->tos) |
|
|
418 | { |
|
|
419 | this->tos = tos; |
413 | setsockopt (fd, SOL_IP, IP_TOS, &tos, sizeof tos); |
420 | setsockopt (fd, SOL_IP, IP_TOS, &tos, sizeof tos); |
|
|
421 | } |
414 | #endif |
422 | #endif |
415 | |
423 | |
416 | w_pkt = pkt; |
424 | w_pkt = pkt; |
417 | w_ofs = 0; |
425 | w_ofs = 0; |
418 | w_len = pkt->len + 2; // length + size header |
426 | w_len = pkt->len + 2; // length + size header |
… | |
… | |
432 | return state != ERROR; |
440 | return state != ERROR; |
433 | } |
441 | } |
434 | |
442 | |
435 | void tcp_connection::error () |
443 | void tcp_connection::error () |
436 | { |
444 | { |
|
|
445 | stop (); |
|
|
446 | |
437 | if (fd >= 0) |
447 | if (fd >= 0) |
438 | { |
448 | { |
439 | close (fd); |
449 | close (fd); |
|
|
450 | tos = -1; |
440 | fd = -1; |
451 | fd = -1; |
441 | } |
452 | } |
442 | |
453 | |
443 | delete r_pkt; r_pkt = 0; |
454 | delete r_pkt; r_pkt = 0; |
444 | delete w_pkt; w_pkt = 0; |
455 | delete w_pkt; w_pkt = 0; |
445 | #if ENABLE_HTTP_PROXY |
456 | #if ENABLE_HTTP_PROXY |
446 | free (proxy_req); proxy_req = 0; |
457 | free (proxy_req); proxy_req = 0; |
447 | #endif |
458 | #endif |
448 | |
459 | |
449 | stop (); |
|
|
450 | state = active ? IDLE : ERROR; |
460 | state = active ? IDLE : ERROR; |
451 | } |
461 | } |
452 | |
462 | |
453 | tcp_connection::tcp_connection (int fd_, const sockinfo &si_, vpn &v_) |
463 | tcp_connection::tcp_connection (int fd_, const sockinfo &si_, vpn &v_) |
454 | : v(v_), si(si_), ev::io(this, &tcp_connection::tcpv4_ev) |
464 | : v(v_), si(si_), ev::io(this, &tcp_connection::tcpv4_ev) |
455 | { |
465 | { |
456 | if (!tcp_si.cleaner.active) |
|
|
457 | tcp_si.cleaner.start (0); |
|
|
458 | |
|
|
459 | last_activity = ev::ev_now (); |
466 | last_activity = ev_now (); |
460 | r_pkt = 0; |
467 | r_pkt = 0; |
461 | w_pkt = 0; |
468 | w_pkt = 0; |
|
|
469 | tos = -1; |
462 | fd = fd_; |
470 | fd = fd_; |
463 | #if ENABLE_HTTP_PROXY |
471 | #if ENABLE_HTTP_PROXY |
464 | proxy_req = 0; |
472 | proxy_req = 0; |
465 | #endif |
473 | #endif |
466 | |
474 | |