1 | /* |
1 | /* |
2 | vpn.C -- handle the protocol, encryption, handshaking etc. |
2 | vpn.C -- handle the protocol, encryption, handshaking etc. |
3 | Copyright (C) 2003-2005 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 | #include <list> |
34 | #include <list> |
… | |
… | |
46 | |
56 | |
47 | vpn network; // THE vpn (bad design...) |
57 | vpn network; // THE vpn (bad design...) |
48 | |
58 | |
49 | ///////////////////////////////////////////////////////////////////////////// |
59 | ///////////////////////////////////////////////////////////////////////////// |
50 | |
60 | |
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61 | static void inline |
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62 | set_tos (int fd, int &tos_prev, int tos) |
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63 | { |
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64 | #if defined(SOL_IP) && defined(IP_TOS) |
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65 | if (tos_prev == tos) |
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66 | return; |
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67 | |
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68 | tos_prev = tos; |
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69 | setsockopt (fd, SOL_IP, IP_TOS, &tos, sizeof tos); |
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70 | #endif |
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71 | } |
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72 | |
51 | void |
73 | void |
52 | vpn::script_init_env () |
74 | vpn::script_init_env () |
53 | { |
75 | { |
54 | // the tunnel device mtu should be the physical mtu - overhead |
76 | // the tunnel device mtu should be the physical mtu - overhead |
55 | // the tricky part is rounding to the cipher key blocksize |
77 | // the tricky part is rounding to the cipher key blocksize |
… | |
… | |
75 | snprintf (ext, 16, "_%d", (*c)->conf->id); |
97 | snprintf (ext, 16, "_%d", (*c)->conf->id); |
76 | (*c)->script_init_env (ext); |
98 | (*c)->script_init_env (ext); |
77 | } |
99 | } |
78 | } |
100 | } |
79 | |
101 | |
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102 | inline const char * |
80 | const char *vpn::script_if_init () |
103 | vpn::script_if_init () |
81 | { |
104 | { |
82 | script_init_env (); |
105 | script_init_env (); |
83 | |
106 | |
84 | return tap->if_up (); |
107 | return tap->if_up (); |
85 | } |
108 | } |
86 | |
109 | |
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110 | inline const char * |
87 | const char *vpn::script_if_up () |
111 | vpn::script_if_up () |
88 | { |
112 | { |
89 | script_init_env (); |
113 | script_init_env (); |
90 | |
114 | |
91 | char *filename; |
115 | char *filename; |
92 | asprintf (&filename, |
116 | asprintf (&filename, |
… | |
… | |
98 | } |
122 | } |
99 | |
123 | |
100 | int |
124 | int |
101 | vpn::setup () |
125 | vpn::setup () |
102 | { |
126 | { |
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127 | ipv4_tos = -1; |
103 | ipv4_fd = -1; |
128 | ipv4_fd = -1; |
104 | |
129 | |
105 | if (THISNODE->protocols & PROT_IPv4 && ::conf.ip_proto) |
130 | if (THISNODE->protocols & PROT_IPv4 && ::conf.ip_proto) |
106 | { |
131 | { |
107 | ipv4_fd = socket (PF_INET, SOCK_RAW, ::conf.ip_proto); |
132 | ipv4_fd = socket (PF_INET, SOCK_RAW, ::conf.ip_proto); |
108 | |
133 | |
… | |
… | |
124 | |
149 | |
125 | sockinfo si (THISNODE, PROT_IPv4); |
150 | sockinfo si (THISNODE, PROT_IPv4); |
126 | |
151 | |
127 | if (bind (ipv4_fd, si.sav4 (), si.salenv4 ())) |
152 | if (bind (ipv4_fd, si.sav4 (), si.salenv4 ())) |
128 | { |
153 | { |
129 | slog (L_ERR, _("can't bind ipv4 socket on %s: %s"), (const char *)si, strerror (errno)); |
154 | slog (L_ERR, _("can't bind ipv4 socket on %s: %s, exiting."), (const char *)si, strerror (errno)); |
130 | exit (EXIT_FAILURE); |
155 | exit (EXIT_FAILURE); |
131 | } |
156 | } |
132 | |
157 | |
133 | ipv4_ev_watcher.start (ipv4_fd, EVENT_READ); |
158 | ipv4_ev_watcher.start (ipv4_fd, EV_READ); |
134 | } |
159 | } |
135 | |
160 | |
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161 | udpv4_tos = -1; |
136 | udpv4_fd = -1; |
162 | udpv4_fd = -1; |
137 | |
163 | |
138 | if (THISNODE->protocols & PROT_UDPv4 && THISNODE->udp_port) |
164 | if (THISNODE->protocols & PROT_UDPv4 && THISNODE->udp_port) |
139 | { |
165 | { |
140 | udpv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP); |
166 | udpv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP); |
141 | |
167 | |
… | |
… | |
163 | |
189 | |
164 | sockinfo si (THISNODE, PROT_UDPv4); |
190 | sockinfo si (THISNODE, PROT_UDPv4); |
165 | |
191 | |
166 | if (bind (udpv4_fd, si.sav4 (), si.salenv4 ())) |
192 | if (bind (udpv4_fd, si.sav4 (), si.salenv4 ())) |
167 | { |
193 | { |
168 | slog (L_ERR, _("can't bind udpv4 on %s: %s"), (const char *)si, strerror (errno)); |
194 | slog (L_ERR, _("can't bind udpv4 on %s: %s, exiting."), (const char *)si, strerror (errno)); |
169 | exit (EXIT_FAILURE); |
195 | exit (EXIT_FAILURE); |
170 | } |
196 | } |
171 | |
197 | |
172 | udpv4_ev_watcher.start (udpv4_fd, EVENT_READ); |
198 | udpv4_ev_watcher.start (udpv4_fd, EV_READ); |
173 | } |
199 | } |
174 | |
200 | |
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201 | icmpv4_tos = -1; |
175 | icmpv4_fd = -1; |
202 | icmpv4_fd = -1; |
176 | |
203 | |
177 | #if ENABLE_ICMP |
204 | #if ENABLE_ICMP |
178 | if (THISNODE->protocols & PROT_ICMPv4) |
205 | if (THISNODE->protocols & PROT_ICMPv4) |
179 | { |
206 | { |
180 | icmpv4_fd = socket (PF_INET, SOCK_RAW, IPPROTO_ICMP); |
207 | icmpv4_fd = socket (PF_INET, SOCK_RAW, IPPROTO_ICMP); |
… | |
… | |
208 | |
235 | |
209 | sockinfo si (THISNODE, PROT_ICMPv4); |
236 | sockinfo si (THISNODE, PROT_ICMPv4); |
210 | |
237 | |
211 | if (bind (icmpv4_fd, si.sav4 (), si.salenv4 ())) |
238 | if (bind (icmpv4_fd, si.sav4 (), si.salenv4 ())) |
212 | { |
239 | { |
213 | slog (L_ERR, _("can't bind icmpv4 on %s: %s"), (const char *)si, strerror (errno)); |
240 | slog (L_ERR, _("can't bind icmpv4 on %s: %s, exiting."), (const char *)si, strerror (errno)); |
214 | exit (EXIT_FAILURE); |
241 | exit (EXIT_FAILURE); |
215 | } |
242 | } |
216 | |
243 | |
217 | icmpv4_ev_watcher.start (icmpv4_fd, EVENT_READ); |
244 | icmpv4_ev_watcher.start (icmpv4_fd, EV_READ); |
218 | } |
245 | } |
219 | #endif |
246 | #endif |
220 | |
247 | |
221 | tcpv4_fd = -1; |
248 | tcpv4_fd = -1; |
222 | |
249 | |
… | |
… | |
239 | |
266 | |
240 | sockinfo si (THISNODE, PROT_TCPv4); |
267 | sockinfo si (THISNODE, PROT_TCPv4); |
241 | |
268 | |
242 | if (bind (tcpv4_fd, si.sav4 (), si.salenv4 ())) |
269 | if (bind (tcpv4_fd, si.sav4 (), si.salenv4 ())) |
243 | { |
270 | { |
244 | slog (L_ERR, _("can't bind tcpv4 on %s: %s"), (const char *)si, strerror (errno)); |
271 | slog (L_ERR, _("can't bind tcpv4 on %s: %s, exiting."), (const char *)si, strerror (errno)); |
245 | exit (EXIT_FAILURE); |
272 | exit (EXIT_FAILURE); |
246 | } |
273 | } |
247 | |
274 | |
248 | if (listen (tcpv4_fd, 5)) |
275 | if (listen (tcpv4_fd, 5)) |
249 | { |
276 | { |
250 | slog (L_ERR, _("can't listen tcpv4 on %s: %s"), (const char *)si, strerror (errno)); |
277 | slog (L_ERR, _("can't listen tcpv4 on %s: %s, exiting."), (const char *)si, strerror (errno)); |
251 | exit (EXIT_FAILURE); |
278 | exit (EXIT_FAILURE); |
252 | } |
279 | } |
253 | |
280 | |
254 | tcpv4_ev_watcher.start (tcpv4_fd, EVENT_READ); |
281 | tcpv4_ev_watcher.start (tcpv4_fd, EV_READ); |
255 | } |
282 | } |
256 | #endif |
283 | #endif |
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284 | |
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285 | dnsv4_tos = -1; |
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286 | dnsv4_fd = -1; |
257 | |
287 | |
258 | #if ENABLE_DNS |
288 | #if ENABLE_DNS |
259 | if (THISNODE->protocols & PROT_DNSv4) |
289 | if (THISNODE->protocols & PROT_DNSv4) |
260 | { |
290 | { |
261 | dns_forwarder.set (::conf.dns_forw_host, ::conf.dns_forw_port, PROT_DNSv4); |
291 | dns_forwarder.set (::conf.dns_forw_host, ::conf.dns_forw_port, PROT_DNSv4); |
… | |
… | |
288 | THISNODE->dns_hostname ? THISNODE->dns_port : 0, |
318 | THISNODE->dns_hostname ? THISNODE->dns_port : 0, |
289 | PROT_DNSv4); |
319 | PROT_DNSv4); |
290 | |
320 | |
291 | if (bind (dnsv4_fd, si.sav4 (), si.salenv4 ())) |
321 | if (bind (dnsv4_fd, si.sav4 (), si.salenv4 ())) |
292 | { |
322 | { |
293 | slog (L_ERR, _("can't bind dnsv4 on %s: %s"), (const char *)si, strerror (errno)); |
323 | slog (L_ERR, _("can't bind dnsv4 on %s: %s, exiting."), (const char *)si, strerror (errno)); |
294 | exit (EXIT_FAILURE); |
324 | exit (EXIT_FAILURE); |
295 | } |
325 | } |
296 | |
326 | |
297 | dnsv4_ev_watcher.start (dnsv4_fd, EVENT_READ); |
327 | dnsv4_ev_watcher.start (dnsv4_fd, EV_READ); |
298 | } |
328 | } |
299 | #endif |
329 | #endif |
300 | |
330 | |
301 | ///////////////////////////////////////////////////////////////////////////// |
331 | ///////////////////////////////////////////////////////////////////////////// |
302 | |
332 | |
… | |
… | |
305 | ///////////////////////////////////////////////////////////////////////////// |
335 | ///////////////////////////////////////////////////////////////////////////// |
306 | |
336 | |
307 | tap = new tap_device (); |
337 | tap = new tap_device (); |
308 | if (!tap) //D this, of course, never catches |
338 | if (!tap) //D this, of course, never catches |
309 | { |
339 | { |
310 | slog (L_ERR, _("cannot create network interface '%s'"), conf.ifname); |
340 | slog (L_ERR, _("cannot create network interface '%s', exiting."), conf.ifname); |
311 | exit (EXIT_FAILURE); |
341 | exit (EXIT_FAILURE); |
312 | } |
342 | } |
313 | |
343 | |
314 | fcntl (tap->fd, F_SETFD, FD_CLOEXEC); |
344 | fcntl (tap->fd, F_SETFD, FD_CLOEXEC); |
315 | |
345 | |
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346 | run_script_cb cb; |
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347 | cb.set<vpn, &vpn::script_if_init> (this); |
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348 | |
316 | if (tap->if_up () && |
349 | if (tap->if_up () && |
317 | !run_script (run_script_cb (this, &vpn::script_if_init), true)) |
350 | !run_script (cb, true)) |
318 | { |
351 | { |
319 | slog (L_ERR, _("interface initialization command '%s' failed, exiting."), |
352 | slog (L_ERR, _("interface initialization command '%s' failed, exiting."), |
320 | tap->if_up ()); |
353 | tap->if_up ()); |
321 | exit (EXIT_FAILURE); |
354 | exit (EXIT_FAILURE); |
322 | } |
355 | } |
323 | |
356 | |
324 | if (!run_script (run_script_cb (this, &vpn::script_if_up), true)) |
357 | cb.set<vpn, &vpn::script_if_up> (this); |
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358 | if (!run_script (cb, true)) |
325 | { |
359 | { |
326 | slog (L_ERR, _("if-up command execution failed, exiting.")); |
360 | slog (L_ERR, _("if-up command execution failed, exiting.")); |
327 | exit (EXIT_FAILURE); |
361 | exit (EXIT_FAILURE); |
328 | } |
362 | } |
329 | |
363 | |
330 | tap_ev_watcher.start (tap->fd, EVENT_READ); |
364 | tap_ev_watcher.start (tap->fd, EV_READ); |
331 | |
365 | |
332 | return 0; |
366 | return 0; |
333 | } |
367 | } |
334 | |
368 | |
335 | bool |
369 | bool |
336 | vpn::send_ipv4_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
370 | vpn::send_ipv4_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
337 | { |
371 | { |
338 | #if defined(SOL_IP) && defined(IP_TOS) |
372 | set_tos (ipv4_fd, ipv4_tos, tos); |
339 | setsockopt (ipv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos); |
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340 | #endif |
|
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341 | sendto (ipv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ()); |
373 | sendto (ipv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ()); |
342 | |
374 | |
343 | return true; |
375 | return true; |
344 | } |
376 | } |
345 | |
377 | |
… | |
… | |
368 | |
400 | |
369 | #if ENABLE_ICMP |
401 | #if ENABLE_ICMP |
370 | bool |
402 | bool |
371 | vpn::send_icmpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
403 | vpn::send_icmpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
372 | { |
404 | { |
373 | #if defined(SOL_IP) && defined(IP_TOS) |
|
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374 | setsockopt (icmpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos); |
|
|
375 | #endif |
|
|
376 | |
|
|
377 | pkt->unshift_hdr (4); |
405 | pkt->unshift_hdr (4); |
378 | |
406 | |
379 | icmp_header *hdr = (icmp_header *)&((*pkt)[0]); |
407 | icmp_header *hdr = (icmp_header *)&((*pkt)[0]); |
380 | hdr->type = ::conf.icmp_type; |
408 | hdr->type = ::conf.icmp_type; |
381 | hdr->code = 255; |
409 | hdr->code = 255; |
382 | hdr->checksum = 0; |
410 | hdr->checksum = 0; |
383 | hdr->checksum = ipv4_checksum ((u16 *)hdr, pkt->len); |
411 | hdr->checksum = ipv4_checksum ((u16 *)hdr, pkt->len); |
384 | |
412 | |
|
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413 | set_tos (icmpv4_fd, icmpv4_tos, tos); |
385 | sendto (icmpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ()); |
414 | sendto (icmpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ()); |
386 | |
415 | |
387 | return true; |
416 | return true; |
388 | } |
417 | } |
389 | #endif |
418 | #endif |
390 | |
419 | |
391 | bool |
420 | bool |
392 | vpn::send_udpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
421 | vpn::send_udpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
393 | { |
422 | { |
394 | #if defined(SOL_IP) && defined(IP_TOS) |
423 | set_tos (udpv4_fd, udpv4_tos, tos); |
395 | setsockopt (udpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos); |
|
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396 | #endif |
|
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397 | sendto (udpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ()); |
424 | sendto (udpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ()); |
398 | |
425 | |
399 | return true; |
426 | return true; |
400 | } |
427 | } |
401 | |
428 | |
… | |
… | |
412 | { |
439 | { |
413 | // broadcast, this is ugly, but due to the security policy |
440 | // broadcast, this is ugly, but due to the security policy |
414 | // we have to connect to all hosts... |
441 | // we have to connect to all hosts... |
415 | for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c) |
442 | for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c) |
416 | if ((*c)->conf != THISNODE) |
443 | if ((*c)->conf != THISNODE) |
417 | (*c)->inject_data_packet (pkt, true); |
444 | (*c)->inject_data_packet (pkt); |
418 | } |
445 | } |
419 | } |
446 | } |
420 | |
447 | |
421 | void |
448 | void |
422 | vpn::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi) |
449 | vpn::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi) |
423 | { |
450 | { |
424 | unsigned int src = pkt->src (); |
451 | unsigned int src = pkt->src (); |
425 | unsigned int dst = pkt->dst (); |
452 | unsigned int dst = pkt->dst (); |
426 | |
453 | |
427 | slog (L_NOISE, _("<<?/%s received possible vpn packet type %d from %d to %d, length %d"), |
454 | slog (L_NOISE, _("<<?/%s received possible vpn packet type %d from %d to %d, length %d."), |
428 | (const char *)rsi, pkt->typ (), pkt->src (), pkt->dst (), pkt->len); |
455 | (const char *)rsi, pkt->typ (), pkt->src (), pkt->dst (), pkt->len); |
429 | |
456 | |
430 | if (src == 0 || src > conns.size () |
457 | if (src == 0 || src > conns.size () |
431 | || dst > conns.size () |
458 | || dst > conns.size () |
432 | || pkt->typ () >= vpn_packet::PT_MAX) |
459 | || pkt->typ () >= vpn_packet::PT_MAX) |
433 | slog (L_WARN, _("(%s): received corrupted packet type %d (src %d, dst %d)"), |
460 | slog (L_WARN, _("(%s): received corrupted packet type %d (src %d, dst %d)."), |
434 | (const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ()); |
461 | (const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ()); |
435 | else if (dst > conns.size ()) |
462 | else if (dst > conns.size ()) |
436 | slog (L_WARN, _("(%s): received corrupted packet type %d (src %d, dst %d)"), |
463 | slog (L_WARN, _("(%s): received corrupted packet type %d (src %d, dst %d)."), |
437 | (const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ()); |
464 | (const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ()); |
438 | else |
465 | else |
439 | { |
466 | { |
440 | connection *c = conns[src - 1]; |
467 | connection *c = conns[src - 1]; |
441 | |
468 | |
442 | if (dst == 0) |
469 | if (dst == 0) |
443 | slog (L_WARN, _("%s(%s): received broadcast (protocol violation)"), |
470 | slog (L_WARN, _("%s(%s): received broadcast (protocol violation)."), |
444 | c->conf->nodename, (const char *)rsi); |
471 | c->conf->nodename, (const char *)rsi); |
445 | else if (dst != THISNODE->id) |
472 | else if (dst != THISNODE->id) |
446 | { |
473 | { |
447 | if (THISNODE->routerprio) |
474 | if (THISNODE->routerprio) |
448 | // the tos setting gets lost here. who cares. |
475 | // the tos setting gets lost here. who cares. |
449 | conns[dst - 1]->inject_vpn_packet (pkt); |
476 | conns[dst - 1]->inject_vpn_packet (pkt); |
450 | else |
477 | else |
451 | slog (L_WARN, |
478 | slog (L_WARN, |
452 | _("%s(%s): forwarding request (=> %s), but we are no router"), |
479 | _("%s(%s): request to forward packet to %s, but we are no router (config mismatch?)."), |
453 | c->conf->nodename, (const char *)rsi, |
480 | c->conf->nodename, (const char *)rsi, |
454 | conns[dst - 1]->conf->nodename); |
481 | conns[dst - 1]->conf->nodename); |
455 | } |
482 | } |
456 | else |
483 | else |
457 | c->recv_vpn_packet (pkt, rsi); |
484 | c->recv_vpn_packet (pkt, rsi); |
… | |
… | |
463 | { |
490 | { |
464 | switch (si.prot) |
491 | switch (si.prot) |
465 | { |
492 | { |
466 | case PROT_IPv4: |
493 | case PROT_IPv4: |
467 | return send_ipv4_packet (pkt, si, tos); |
494 | return send_ipv4_packet (pkt, si, tos); |
|
|
495 | |
468 | case PROT_UDPv4: |
496 | case PROT_UDPv4: |
469 | return send_udpv4_packet (pkt, si, tos); |
497 | return send_udpv4_packet (pkt, si, tos); |
|
|
498 | |
470 | #if ENABLE_TCP |
499 | #if ENABLE_TCP |
471 | case PROT_TCPv4: |
500 | case PROT_TCPv4: |
472 | return send_tcpv4_packet (pkt, si, tos); |
501 | return send_tcpv4_packet (pkt, si, tos); |
473 | #endif |
502 | #endif |
474 | #if ENABLE_ICMP |
503 | #if ENABLE_ICMP |
… | |
… | |
477 | #endif |
506 | #endif |
478 | #if ENABLE_DNS |
507 | #if ENABLE_DNS |
479 | case PROT_DNSv4: |
508 | case PROT_DNSv4: |
480 | return send_dnsv4_packet (pkt, si, tos); |
509 | return send_dnsv4_packet (pkt, si, tos); |
481 | #endif |
510 | #endif |
482 | |
|
|
483 | default: |
511 | default: |
484 | slog (L_CRIT, _("%s: FATAL: trying to send packet with unsupported protocol"), (const char *)si); |
512 | slog (L_CRIT, _("%s: FATAL: trying to send packet with unsupported protocol."), (const char *)si); |
485 | } |
513 | } |
486 | |
514 | |
487 | return false; |
515 | return false; |
488 | } |
516 | } |
489 | |
517 | |
490 | void |
518 | inline void |
491 | vpn::ipv4_ev (io_watcher &w, short revents) |
519 | vpn::ipv4_ev (ev::io &w, int revents) |
492 | { |
520 | { |
493 | if (revents & EVENT_READ) |
521 | if (revents & EV_READ) |
494 | { |
522 | { |
495 | vpn_packet *pkt = new vpn_packet; |
523 | vpn_packet *pkt = new vpn_packet; |
496 | struct sockaddr_in sa; |
524 | struct sockaddr_in sa; |
497 | socklen_t sa_len = sizeof (sa); |
525 | socklen_t sa_len = sizeof (sa); |
498 | int len; |
526 | int len; |
… | |
… | |
511 | recv_vpn_packet (pkt, si); |
539 | recv_vpn_packet (pkt, si); |
512 | } |
540 | } |
513 | else |
541 | else |
514 | { |
542 | { |
515 | // probably ECONNRESET or somesuch |
543 | // probably ECONNRESET or somesuch |
516 | slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno)); |
544 | slog (L_DEBUG, _("%s: %s."), (const char *)si, strerror (errno)); |
517 | } |
545 | } |
518 | |
546 | |
519 | delete pkt; |
547 | delete pkt; |
520 | } |
548 | } |
521 | else |
549 | else |
522 | { |
550 | { |
523 | slog (L_ERR, |
551 | slog (L_ERR, |
524 | _("FATAL: unknown revents %08x in socket, terminating\n"), |
552 | _("FATAL: unknown revents %08x in socket, exiting.\n"), |
525 | revents); |
553 | revents); |
526 | exit (EXIT_FAILURE); |
554 | exit (EXIT_FAILURE); |
527 | } |
555 | } |
528 | } |
556 | } |
529 | |
557 | |
530 | #if ENABLE_ICMP |
558 | #if ENABLE_ICMP |
531 | void |
559 | inline void |
532 | vpn::icmpv4_ev (io_watcher &w, short revents) |
560 | vpn::icmpv4_ev (ev::io &w, int revents) |
533 | { |
561 | { |
534 | if (revents & EVENT_READ) |
562 | if (revents & EV_READ) |
535 | { |
563 | { |
536 | vpn_packet *pkt = new vpn_packet; |
564 | vpn_packet *pkt = new vpn_packet; |
537 | struct sockaddr_in sa; |
565 | struct sockaddr_in sa; |
538 | socklen_t sa_len = sizeof (sa); |
566 | socklen_t sa_len = sizeof (sa); |
539 | int len; |
567 | int len; |
… | |
… | |
559 | } |
587 | } |
560 | } |
588 | } |
561 | else |
589 | else |
562 | { |
590 | { |
563 | // probably ECONNRESET or somesuch |
591 | // probably ECONNRESET or somesuch |
564 | slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno)); |
592 | slog (L_DEBUG, _("%s: %s."), (const char *)si, strerror (errno)); |
565 | } |
593 | } |
566 | |
594 | |
567 | delete pkt; |
595 | delete pkt; |
568 | } |
596 | } |
569 | else |
597 | else |
570 | { |
598 | { |
571 | slog (L_ERR, |
599 | slog (L_ERR, |
572 | _("FATAL: unknown revents %08x in socket, terminating\n"), |
600 | _("FATAL: unknown revents %08x in socket, exiting.\n"), |
573 | revents); |
601 | revents); |
574 | exit (EXIT_FAILURE); |
602 | exit (EXIT_FAILURE); |
575 | } |
603 | } |
576 | } |
604 | } |
577 | #endif |
605 | #endif |
578 | |
606 | |
579 | void |
607 | inline void |
580 | vpn::udpv4_ev (io_watcher &w, short revents) |
608 | vpn::udpv4_ev (ev::io &w, int revents) |
581 | { |
609 | { |
582 | if (revents & EVENT_READ) |
610 | if (revents & EV_READ) |
583 | { |
611 | { |
584 | vpn_packet *pkt = new vpn_packet; |
612 | vpn_packet *pkt = new vpn_packet; |
585 | struct sockaddr_in sa; |
613 | struct sockaddr_in sa; |
586 | socklen_t sa_len = sizeof (sa); |
614 | socklen_t sa_len = sizeof (sa); |
587 | int len; |
615 | int len; |
… | |
… | |
597 | recv_vpn_packet (pkt, si); |
625 | recv_vpn_packet (pkt, si); |
598 | } |
626 | } |
599 | else |
627 | else |
600 | { |
628 | { |
601 | // probably ECONNRESET or somesuch |
629 | // probably ECONNRESET or somesuch |
602 | slog (L_DEBUG, _("%s: fd %d, %s"), (const char *)si, w.fd, strerror (errno)); |
630 | slog (L_DEBUG, _("%s: fd %d, %s."), (const char *)si, w.fd, strerror (errno)); |
603 | } |
631 | } |
604 | |
632 | |
605 | delete pkt; |
633 | delete pkt; |
606 | } |
634 | } |
607 | else |
635 | else |
608 | { |
636 | { |
609 | slog (L_ERR, |
637 | slog (L_ERR, |
610 | _("FATAL: unknown revents %08x in socket, terminating\n"), |
638 | _("FATAL: unknown revents %08x in socket, exiting.\n"), |
611 | revents); |
639 | revents); |
612 | exit (EXIT_FAILURE); |
640 | exit (EXIT_FAILURE); |
613 | } |
641 | } |
614 | } |
642 | } |
615 | |
643 | |
616 | void |
644 | inline void |
617 | vpn::tap_ev (io_watcher &w, short revents) |
645 | vpn::tap_ev (ev::io &w, int revents) |
618 | { |
646 | { |
619 | if (revents & EVENT_READ) |
647 | if (revents & EV_READ) |
620 | { |
648 | { |
621 | /* process data */ |
649 | /* process data */ |
622 | tap_packet *pkt; |
650 | tap_packet *pkt; |
623 | |
651 | |
624 | pkt = tap->recv (); |
652 | pkt = tap->recv (); |
… | |
… | |
653 | } |
681 | } |
654 | else |
682 | else |
655 | abort (); |
683 | abort (); |
656 | } |
684 | } |
657 | |
685 | |
658 | void |
686 | inline void |
659 | vpn::event_cb (time_watcher &w) |
687 | vpn::event_cb (ev::timer &w, int) |
660 | { |
688 | { |
661 | if (events) |
689 | if (events) |
662 | { |
690 | { |
663 | if (events & EVENT_SHUTDOWN) |
691 | if (events & EVENT_SHUTDOWN) |
664 | { |
692 | { |
665 | slog (L_INFO, _("preparing shutdown...")); |
693 | slog (L_INFO, _("preparing shutdown...")); |
666 | |
694 | |
667 | shutdown_all (); |
695 | shutdown_all (); |
668 | remove_pid (conf.pidfilename); |
696 | remove_pid (conf.pidfilename); |
669 | slog (L_INFO, _("terminating")); |
697 | slog (L_INFO, _("exiting.")); |
670 | exit (EXIT_SUCCESS); |
698 | exit (EXIT_SUCCESS); |
671 | } |
699 | } |
672 | |
700 | |
673 | if (events & EVENT_RECONNECT) |
701 | if (events & EVENT_RECONNECT) |
674 | { |
702 | { |
675 | slog (L_INFO, _("forced reconnect")); |
703 | slog (L_INFO, _("forced reconnect.")); |
676 | |
704 | |
677 | reconnect_all (); |
705 | reconnect_all (); |
678 | } |
706 | } |
679 | |
707 | |
680 | events = 0; |
708 | events = 0; |
… | |
… | |
696 | |
724 | |
697 | conns.clear (); |
725 | conns.clear (); |
698 | |
726 | |
699 | connection_init (); |
727 | connection_init (); |
700 | |
728 | |
701 | for (configuration::node_vector::iterator i = conf.nodes.begin (); |
729 | for (configuration::node_vector::iterator i = conf.nodes.begin (); i != conf.nodes.end (); ++i) |
702 | i != conf.nodes.end (); ++i) |
730 | conns.push_back (new connection (this, *i)); |
703 | { |
731 | |
704 | connection *conn = new connection (this, *i); |
732 | for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c) |
705 | conns.push_back (conn); |
|
|
706 | conn->establish_connection (); |
733 | (*c)->establish_connection (); |
707 | } |
|
|
708 | } |
734 | } |
709 | |
735 | |
710 | connection *vpn::find_router () |
736 | bool vpn::can_direct (conf_node *src, conf_node *dst) const |
711 | { |
737 | { |
712 | u32 prio = 1; |
738 | return src != dst |
|
|
739 | && src->may_direct (dst) |
|
|
740 | && dst->may_direct (src) |
|
|
741 | && (((src->protocols & dst->protocols) && src->connectmode == conf_node::C_ALWAYS) |
|
|
742 | || (src->protocols & dst->connectable_protocols ())); |
|
|
743 | } |
|
|
744 | |
|
|
745 | // only works for indirect and routed connections: find a router |
|
|
746 | // from THISNODE to dst |
|
|
747 | connection *vpn::find_router_for (const connection *dst) |
|
|
748 | { |
713 | connection *router = 0; |
749 | connection *router = 0; |
714 | |
750 | |
|
|
751 | // first try to find a router with a direct connection |
|
|
752 | { |
|
|
753 | u32 prio = 1; |
|
|
754 | |
|
|
755 | for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i) |
|
|
756 | { |
|
|
757 | connection *c = *i; |
|
|
758 | |
|
|
759 | if (c->conf->routerprio > prio |
|
|
760 | && c->conf != THISNODE |
|
|
761 | && c != dst |
|
|
762 | && can_direct (c->conf, dst->conf)) |
|
|
763 | { |
|
|
764 | if (c->ictx && c->octx) |
|
|
765 | { |
|
|
766 | prio = c->conf->routerprio; |
|
|
767 | router = c; |
|
|
768 | } |
|
|
769 | else |
|
|
770 | c->establish_connection (); |
|
|
771 | } |
|
|
772 | } |
|
|
773 | } |
|
|
774 | |
|
|
775 | if (router) |
|
|
776 | return router; |
|
|
777 | |
|
|
778 | // second try find the router with the highest priority higher than ours |
|
|
779 | { |
|
|
780 | u32 prio = 1; |
|
|
781 | |
|
|
782 | for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i) |
|
|
783 | { |
|
|
784 | connection *c = *i; |
|
|
785 | |
|
|
786 | if (c->conf->routerprio > prio |
|
|
787 | && c->conf->routerprio > THISNODE->routerprio |
|
|
788 | && c != dst |
|
|
789 | && c->conf != THISNODE) |
|
|
790 | { |
|
|
791 | if (c->ictx && c->octx) |
|
|
792 | { |
|
|
793 | prio = c->conf->routerprio; |
|
|
794 | router = c; |
|
|
795 | } |
|
|
796 | else |
|
|
797 | c->establish_connection (); |
|
|
798 | } |
|
|
799 | } |
|
|
800 | } |
|
|
801 | return router; |
|
|
802 | } |
|
|
803 | |
|
|
804 | void vpn::connection_established (connection *c) |
|
|
805 | { |
715 | for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i) |
806 | for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i) |
716 | { |
807 | { |
717 | connection *c = *i; |
808 | connection *o = *i; |
718 | |
809 | |
719 | if (c->conf->routerprio > prio |
810 | if (!o->is_direct |
720 | && c->connectmode == conf_node::C_ALWAYS // so we don't drop the connection if in use |
811 | && o->si.valid () |
721 | && c->ictx && c->octx |
812 | && c->si != o->si |
722 | && c->conf != THISNODE) // redundant, since ictx==octx==0 always on thisnode |
813 | && c == find_router_for (o)) |
723 | { |
|
|
724 | prio = c->conf->routerprio; |
|
|
725 | router = c; |
|
|
726 | } |
814 | { |
|
|
815 | slog (L_DEBUG, _("%s: can now route packets via %s, re-keying connection."), |
|
|
816 | o->conf->nodename, c->conf->nodename); |
|
|
817 | o->rekey (); |
|
|
818 | } |
727 | } |
819 | } |
728 | |
|
|
729 | return router; |
|
|
730 | } |
820 | } |
731 | |
821 | |
732 | void vpn::send_connect_request (int id) |
822 | void vpn::send_connect_request (connection *c) |
733 | { |
823 | { |
734 | connection *c = find_router (); |
824 | connection *r = find_router_for (c); |
735 | |
825 | |
736 | if (c) |
826 | if (r) |
|
|
827 | { |
|
|
828 | slog (L_TRACE, _("%s: no way to connect, sending mediated connection request via %s."), |
|
|
829 | c->conf->nodename, r->conf->nodename); |
737 | c->send_connect_request (id); |
830 | r->send_connect_request (c->conf->id); |
|
|
831 | } |
738 | else |
832 | else |
739 | // no router found, aggressively connect to all routers |
833 | slog (L_DEBUG, _("%s: no way to connect and no router found: unable to connect."), |
740 | for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i) |
834 | c->conf->nodename); |
741 | if ((*i)->conf->routerprio && (*i)->conf != THISNODE) |
|
|
742 | (*i)->establish_connection (); |
|
|
743 | } |
835 | } |
744 | |
836 | |
745 | void |
837 | void |
746 | connection::dump_status () |
838 | connection::dump_status () |
747 | { |
839 | { |
748 | slog (L_NOTICE, _("node %s (id %d)"), conf->nodename, conf->id); |
840 | slog (L_NOTICE, _("node %s (id %d)"), conf->nodename, conf->id); |
749 | slog (L_NOTICE, _(" connectmode %d (%d) / sockaddr %s / minor %d"), |
841 | slog (L_NOTICE, _(" connectmode %d (%d) / sockaddr %s / minor %d"), |
750 | connectmode, conf->connectmode, (const char *)si, (int)prot_minor); |
842 | connectmode, conf->connectmode, (const char *)si, (int)prot_minor); |
751 | slog (L_NOTICE, _(" ictx/octx %08lx/%08lx / oseqno %d / retry_cnt %d"), |
843 | slog (L_NOTICE, _(" ictx/octx %08lx/%08lx / oseqno %d / retry_cnt %d"), |
752 | (long)ictx, (long)octx, (int)oseqno, (int)retry_cnt); |
844 | (long)ictx, (long)octx, (int)oseqno, (int)retry_cnt); |
753 | slog (L_NOTICE, _(" establish_conn %ld / rekey %ld / keepalive %ld"), |
|
|
754 | (long)(establish_connection.at), (long)(rekey.at), (long)(keepalive.at)); |
|
|
755 | } |
845 | } |
756 | |
846 | |
757 | void |
847 | void |
758 | vpn::dump_status () |
848 | vpn::dump_status () |
759 | { |
849 | { |
760 | slog (L_NOTICE, _("BEGIN status dump (%ld)"), (long)NOW); |
850 | slog (L_NOTICE, _("BEGIN status dump (%ld)"), (long)ev_now ()); |
761 | |
851 | |
762 | for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c) |
852 | for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c) |
763 | (*c)->dump_status (); |
853 | (*c)->dump_status (); |
764 | |
854 | |
765 | slog (L_NOTICE, _("END status dump")); |
855 | slog (L_NOTICE, _("END status dump")); |
766 | } |
856 | } |
767 | |
857 | |
768 | vpn::vpn (void) |
858 | vpn::vpn (void) |
|
|
859 | { |
769 | : event (this, &vpn::event_cb) |
860 | event .set<vpn, &vpn::event_cb > (this); |
770 | , udpv4_ev_watcher (this, &vpn::udpv4_ev) |
861 | udpv4_ev_watcher .set<vpn, &vpn::udpv4_ev > (this); |
771 | , ipv4_ev_watcher (this, &vpn::ipv4_ev) |
862 | ipv4_ev_watcher .set<vpn, &vpn::ipv4_ev > (this); |
772 | #if ENABLE_TCP |
863 | #if ENABLE_TCP |
773 | , tcpv4_ev_watcher (this, &vpn::tcpv4_ev) |
864 | tcpv4_ev_watcher .set<vpn, &vpn::tcpv4_ev > (this); |
774 | #endif |
865 | #endif |
775 | #if ENABLE_ICMP |
866 | #if ENABLE_ICMP |
776 | , icmpv4_ev_watcher(this, &vpn::icmpv4_ev) |
867 | icmpv4_ev_watcher.set<vpn, &vpn::icmpv4_ev> (this); |
777 | #endif |
868 | #endif |
778 | #if ENABLE_DNS |
869 | #if ENABLE_DNS |
779 | , dnsv4_ev_watcher (this, &vpn::dnsv4_ev) |
870 | dnsv4_ev_watcher .set<vpn, &vpn::dnsv4_ev > (this); |
780 | #endif |
871 | #endif |
781 | , tap_ev_watcher (this, &vpn::tap_ev) |
872 | tap_ev_watcher .set<vpn, &vpn::tap_ev > (this); |
782 | { |
|
|
783 | } |
873 | } |
784 | |
874 | |
785 | vpn::~vpn () |
875 | vpn::~vpn () |
786 | { |
876 | { |
787 | } |
877 | } |