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 | void cleaner_cb (time_watcher &w); time_watcher cleaner; |
63 | { |
|
|
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 | { } |
67 | { |
|
|
68 | cleaner.set<tcp_si_map, &tcp_si_map::cleaner_cb> (this); |
|
|
69 | cleaner.start (::conf.keepalive / 2, ::conf.keepalive / 2); |
|
|
70 | } |
68 | |
71 | |
69 | } tcp_si; |
72 | } tcp_si; |
70 | |
73 | |
71 | struct tcp_connection : io_watcher { |
74 | struct tcp_connection : ev::io |
|
|
75 | { |
|
|
76 | int tos; |
72 | tstamp last_activity; |
77 | tstamp last_activity; |
73 | const sockinfo si; |
78 | const sockinfo si; |
74 | vpn &v; |
79 | vpn &v; |
75 | bool active; // this connection has been actively established |
80 | bool active; // this connection has been actively established |
76 | enum { ERROR, IDLE, CONNECTING, CONNECTING_PROXY, ESTABLISHED } state; |
81 | enum { ERROR, IDLE, CONNECTING, CONNECTING_PROXY, ESTABLISHED } state; |
… | |
… | |
84 | #if ENABLE_HTTP_PROXY |
89 | #if ENABLE_HTTP_PROXY |
85 | char *proxy_req; |
90 | char *proxy_req; |
86 | int proxy_req_len; |
91 | int proxy_req_len; |
87 | #endif |
92 | #endif |
88 | |
93 | |
89 | void tcpv4_ev (io_watcher &w, short revents); |
94 | void tcpv4_ev (ev::io &w, int revents); |
90 | |
95 | |
91 | bool send_packet (vpn_packet *pkt, int tos); |
96 | bool send_packet (vpn_packet *pkt, int tos); |
92 | bool write_packet (); |
97 | bool write_packet (); |
93 | |
98 | |
94 | void error (); // abort conenction && cleanup |
99 | void error (); // abort conenction && cleanup |
… | |
… | |
100 | |
105 | |
101 | tcp_connection (int fd_, const sockinfo &si_, vpn &v_); |
106 | tcp_connection (int fd_, const sockinfo &si_, vpn &v_); |
102 | ~tcp_connection (); |
107 | ~tcp_connection (); |
103 | }; |
108 | }; |
104 | |
109 | |
105 | void tcp_si_map::cleaner_cb (time_watcher &w) |
110 | void tcp_si_map::cleaner_cb (ev::timer &w, int revents) |
106 | { |
111 | { |
107 | w.start (NOW + 600); |
|
|
108 | |
|
|
109 | tstamp to = 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 | |
121 | void |
125 | void |
122 | vpn::tcpv4_ev (io_watcher &w, short revents) |
126 | vpn::tcpv4_ev (ev::io &w, int revents) |
123 | { |
127 | { |
124 | if (revents & EVENT_READ) |
128 | if (revents & EV_READ) |
125 | { |
129 | { |
126 | struct sockaddr_in sa; |
130 | struct sockaddr_in sa; |
127 | socklen_t sa_len = sizeof (sa); |
131 | socklen_t sa_len = sizeof (sa); |
128 | int len; |
132 | int len; |
129 | |
133 | |
… | |
… | |
198 | return false; |
202 | return false; |
199 | } |
203 | } |
200 | } |
204 | } |
201 | |
205 | |
202 | void |
206 | void |
203 | tcp_connection::tcpv4_ev (io_watcher &w, short revents) |
207 | tcp_connection::tcpv4_ev (ev::io &w, int revents) |
204 | { |
208 | { |
205 | last_activity = NOW; |
209 | last_activity = ev_now (); |
206 | |
210 | |
207 | if (revents & EVENT_WRITE) |
211 | if (revents & EV_WRITE) |
208 | { |
212 | { |
209 | if (state == CONNECTING) |
213 | if (state == CONNECTING) |
210 | { |
214 | { |
211 | state = ESTABLISHED; |
215 | state = ESTABLISHED; |
212 | set (EVENT_READ); |
216 | set (EV_READ); |
213 | #if ENABLE_HTTP_PROXY |
217 | #if ENABLE_HTTP_PROXY |
214 | if (::conf.proxy_host && ::conf.proxy_port) |
218 | if (::conf.proxy_host && ::conf.proxy_port) |
215 | { |
219 | { |
216 | state = CONNECTING_PROXY; |
220 | state = CONNECTING_PROXY; |
217 | |
221 | |
… | |
… | |
231 | { |
235 | { |
232 | if (write_packet ()) |
236 | if (write_packet ()) |
233 | { |
237 | { |
234 | delete w_pkt; w_pkt = 0; |
238 | delete w_pkt; w_pkt = 0; |
235 | |
239 | |
236 | set (EVENT_READ); |
240 | set (EV_READ); |
237 | } |
241 | } |
238 | } |
242 | } |
239 | else |
243 | else |
240 | set (EVENT_READ); |
244 | set (EV_READ); |
241 | } |
245 | } |
242 | else |
246 | else |
243 | set (EVENT_READ); |
247 | set (EV_READ); |
244 | } |
248 | } |
245 | |
249 | |
246 | if (revents & EVENT_READ) |
250 | if (revents & EV_READ) |
247 | { |
251 | { |
248 | if (state == ESTABLISHED) |
252 | if (state == ESTABLISHED) |
249 | for (;;) |
253 | for (;;) |
250 | { |
254 | { |
251 | if (!r_pkt) |
255 | if (!r_pkt) |
… | |
… | |
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 = 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); |
… | |
… | |
393 | { |
397 | { |
394 | fcntl (fd, F_SETFL, O_NONBLOCK); |
398 | fcntl (fd, F_SETFL, O_NONBLOCK); |
395 | fcntl (fd, F_SETFD, FD_CLOEXEC); |
399 | fcntl (fd, F_SETFD, FD_CLOEXEC); |
396 | |
400 | |
397 | state = CONNECTING; |
401 | state = CONNECTING; |
398 | start (fd, EVENT_WRITE); |
402 | start (fd, EV_WRITE); |
399 | } |
403 | } |
400 | else |
404 | else |
401 | close (fd); |
405 | close (fd); |
402 | } |
406 | } |
403 | } |
407 | } |
… | |
… | |
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 |
… | |
… | |
422 | else |
430 | else |
423 | { |
431 | { |
424 | w_pkt = new vpn_packet; |
432 | w_pkt = new vpn_packet; |
425 | w_pkt->set (*pkt); |
433 | w_pkt->set (*pkt); |
426 | |
434 | |
427 | set (EVENT_READ | EVENT_WRITE); |
435 | set (EV_READ | EV_WRITE); |
428 | } |
436 | } |
429 | } |
437 | } |
430 | } |
438 | } |
431 | |
439 | |
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_), io_watcher(this, &tcp_connection::tcpv4_ev) |
464 | : v(v_), si(si_) |
455 | { |
465 | { |
456 | if (!tcp_si.cleaner.active) |
466 | set<tcp_connection, &tcp_connection::tcpv4_ev> (this); |
457 | tcp_si.cleaner.start (0); |
|
|
458 | |
467 | |
459 | last_activity = NOW; |
468 | last_activity = ev_now (); |
460 | r_pkt = 0; |
469 | r_pkt = 0; |
461 | w_pkt = 0; |
470 | w_pkt = 0; |
|
|
471 | tos = -1; |
462 | fd = fd_; |
472 | fd = fd_; |
463 | #if ENABLE_HTTP_PROXY |
473 | #if ENABLE_HTTP_PROXY |
464 | proxy_req = 0; |
474 | proxy_req = 0; |
465 | #endif |
475 | #endif |
466 | |
476 | |
… | |
… | |
471 | } |
481 | } |
472 | else |
482 | else |
473 | { |
483 | { |
474 | active = false; |
484 | active = false; |
475 | state = ESTABLISHED; |
485 | state = ESTABLISHED; |
476 | start (fd, EVENT_READ); |
486 | start (fd, EV_READ); |
477 | } |
487 | } |
478 | } |
488 | } |
479 | |
489 | |
480 | tcp_connection::~tcp_connection () |
490 | tcp_connection::~tcp_connection () |
481 | { |
491 | { |