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. 59 Temple Place, Suite 330, Boston, MA 02111-1307 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 | |
109 | if (ipv4_fd < 0) |
134 | if (ipv4_fd < 0) |
110 | return -1; |
135 | return -1; |
111 | |
136 | |
112 | fcntl (ipv4_fd, F_SETFL, O_NONBLOCK); |
137 | fcntl (ipv4_fd, F_SETFL, O_NONBLOCK); |
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138 | fcntl (ipv4_fd, F_SETFD, FD_CLOEXEC); |
113 | |
139 | |
114 | #if defined(SOL_IP) && defined(IP_MTU_DISCOVER) |
140 | #if defined(SOL_IP) && defined(IP_MTU_DISCOVER) |
115 | // this I really consider a linux bug. I am neither connected |
141 | // this I really consider a linux bug. I am neither connected |
116 | // nor do I fragment myself. Linux still sets DF and doesn't |
142 | // nor do I fragment myself. Linux still sets DF and doesn't |
117 | // fragment for me sometimes. |
143 | // fragment for me sometimes. |
… | |
… | |
123 | |
149 | |
124 | sockinfo si (THISNODE, PROT_IPv4); |
150 | sockinfo si (THISNODE, PROT_IPv4); |
125 | |
151 | |
126 | if (bind (ipv4_fd, si.sav4 (), si.salenv4 ())) |
152 | if (bind (ipv4_fd, si.sav4 (), si.salenv4 ())) |
127 | { |
153 | { |
128 | 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)); |
129 | exit (EXIT_FAILURE); |
155 | exit (EXIT_FAILURE); |
130 | } |
156 | } |
131 | |
157 | |
132 | ipv4_ev_watcher.start (ipv4_fd, EVENT_READ); |
158 | ipv4_ev_watcher.start (ipv4_fd, EV_READ); |
133 | } |
159 | } |
134 | |
160 | |
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161 | udpv4_tos = -1; |
135 | udpv4_fd = -1; |
162 | udpv4_fd = -1; |
136 | |
163 | |
137 | if (THISNODE->protocols & PROT_UDPv4 && THISNODE->udp_port) |
164 | if (THISNODE->protocols & PROT_UDPv4 && THISNODE->udp_port) |
138 | { |
165 | { |
139 | udpv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP); |
166 | udpv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP); |
140 | |
167 | |
141 | if (udpv4_fd < 0) |
168 | if (udpv4_fd < 0) |
142 | return -1; |
169 | return -1; |
143 | |
170 | |
144 | fcntl (udpv4_fd, F_SETFL, O_NONBLOCK); |
171 | fcntl (udpv4_fd, F_SETFL, O_NONBLOCK); |
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172 | fcntl (udpv4_fd, F_SETFD, FD_CLOEXEC); |
145 | |
173 | |
146 | // standard daemon practise... |
174 | // standard daemon practise... |
147 | { |
175 | { |
148 | int oval = 1; |
176 | int oval = 1; |
149 | setsockopt (udpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval); |
177 | setsockopt (udpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval); |
… | |
… | |
161 | |
189 | |
162 | sockinfo si (THISNODE, PROT_UDPv4); |
190 | sockinfo si (THISNODE, PROT_UDPv4); |
163 | |
191 | |
164 | if (bind (udpv4_fd, si.sav4 (), si.salenv4 ())) |
192 | if (bind (udpv4_fd, si.sav4 (), si.salenv4 ())) |
165 | { |
193 | { |
166 | 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)); |
167 | exit (EXIT_FAILURE); |
195 | exit (EXIT_FAILURE); |
168 | } |
196 | } |
169 | |
197 | |
170 | udpv4_ev_watcher.start (udpv4_fd, EVENT_READ); |
198 | udpv4_ev_watcher.start (udpv4_fd, EV_READ); |
171 | } |
199 | } |
172 | |
200 | |
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201 | icmpv4_tos = -1; |
173 | icmpv4_fd = -1; |
202 | icmpv4_fd = -1; |
174 | |
203 | |
175 | #if ENABLE_ICMP |
204 | #if ENABLE_ICMP |
176 | if (THISNODE->protocols & PROT_ICMPv4) |
205 | if (THISNODE->protocols & PROT_ICMPv4) |
177 | { |
206 | { |
178 | icmpv4_fd = socket (PF_INET, SOCK_RAW, IPPROTO_ICMP); |
207 | icmpv4_fd = socket (PF_INET, SOCK_RAW, IPPROTO_ICMP); |
179 | |
208 | |
180 | if (icmpv4_fd < 0) |
209 | if (icmpv4_fd < 0) |
181 | return -1; |
210 | return -1; |
182 | |
211 | |
183 | fcntl (icmpv4_fd, F_SETFL, O_NONBLOCK); |
212 | fcntl (icmpv4_fd, F_SETFL, O_NONBLOCK); |
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213 | fcntl (icmpv4_fd, F_SETFD, FD_CLOEXEC); |
184 | |
214 | |
185 | #ifdef ICMP_FILTER |
215 | #ifdef ICMP_FILTER |
186 | { |
216 | { |
187 | icmp_filter oval; |
217 | icmp_filter oval; |
188 | oval.data = 0xffffffff; |
218 | oval.data = 0xffffffff; |
… | |
… | |
197 | // this I really consider a linux bug. I am neither connected |
227 | // this I really consider a linux bug. I am neither connected |
198 | // nor do I fragment myself. Linux still sets DF and doesn't |
228 | // nor do I fragment myself. Linux still sets DF and doesn't |
199 | // fragment for me sometimes. |
229 | // fragment for me sometimes. |
200 | { |
230 | { |
201 | int oval = IP_PMTUDISC_DONT; |
231 | int oval = IP_PMTUDISC_DONT; |
202 | setsockopt (udpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval); |
232 | setsockopt (icmpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval); |
203 | } |
233 | } |
204 | #endif |
234 | #endif |
205 | |
235 | |
206 | sockinfo si (THISNODE, PROT_ICMPv4); |
236 | sockinfo si (THISNODE, PROT_ICMPv4); |
207 | |
237 | |
208 | if (bind (icmpv4_fd, si.sav4 (), si.salenv4 ())) |
238 | if (bind (icmpv4_fd, si.sav4 (), si.salenv4 ())) |
209 | { |
239 | { |
210 | 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)); |
211 | exit (EXIT_FAILURE); |
241 | exit (EXIT_FAILURE); |
212 | } |
242 | } |
213 | |
243 | |
214 | icmpv4_ev_watcher.start (icmpv4_fd, EVENT_READ); |
244 | icmpv4_ev_watcher.start (icmpv4_fd, EV_READ); |
215 | } |
245 | } |
216 | #endif |
246 | #endif |
217 | |
247 | |
218 | tcpv4_fd = -1; |
248 | tcpv4_fd = -1; |
219 | |
249 | |
… | |
… | |
224 | |
254 | |
225 | if (tcpv4_fd < 0) |
255 | if (tcpv4_fd < 0) |
226 | return -1; |
256 | return -1; |
227 | |
257 | |
228 | fcntl (tcpv4_fd, F_SETFL, O_NONBLOCK); |
258 | fcntl (tcpv4_fd, F_SETFL, O_NONBLOCK); |
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259 | fcntl (tcpv4_fd, F_SETFD, FD_CLOEXEC); |
229 | |
260 | |
230 | // standard daemon practise... |
261 | // standard daemon practise... |
231 | { |
262 | { |
232 | int oval = 1; |
263 | int oval = 1; |
233 | setsockopt (tcpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval); |
264 | setsockopt (tcpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval); |
… | |
… | |
235 | |
266 | |
236 | sockinfo si (THISNODE, PROT_TCPv4); |
267 | sockinfo si (THISNODE, PROT_TCPv4); |
237 | |
268 | |
238 | if (bind (tcpv4_fd, si.sav4 (), si.salenv4 ())) |
269 | if (bind (tcpv4_fd, si.sav4 (), si.salenv4 ())) |
239 | { |
270 | { |
240 | 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)); |
241 | exit (EXIT_FAILURE); |
272 | exit (EXIT_FAILURE); |
242 | } |
273 | } |
243 | |
274 | |
244 | if (listen (tcpv4_fd, 5)) |
275 | if (listen (tcpv4_fd, 5)) |
245 | { |
276 | { |
246 | 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)); |
247 | exit (EXIT_FAILURE); |
278 | exit (EXIT_FAILURE); |
248 | } |
279 | } |
249 | |
280 | |
250 | tcpv4_ev_watcher.start (tcpv4_fd, EVENT_READ); |
281 | tcpv4_ev_watcher.start (tcpv4_fd, EV_READ); |
251 | } |
282 | } |
252 | #endif |
283 | #endif |
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284 | |
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285 | dnsv4_tos = -1; |
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286 | dnsv4_fd = -1; |
253 | |
287 | |
254 | #if ENABLE_DNS |
288 | #if ENABLE_DNS |
255 | if (THISNODE->protocols & PROT_DNSv4) |
289 | if (THISNODE->protocols & PROT_DNSv4) |
256 | { |
290 | { |
257 | 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); |
… | |
… | |
259 | dnsv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP); |
293 | dnsv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP); |
260 | |
294 | |
261 | if (dnsv4_fd < 0) |
295 | if (dnsv4_fd < 0) |
262 | return -1; |
296 | return -1; |
263 | |
297 | |
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298 | fcntl (dnsv4_fd, F_SETFL, O_NONBLOCK); |
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299 | fcntl (dnsv4_fd, F_SETFD, FD_CLOEXEC); |
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300 | |
264 | #if defined(SOL_IP) && defined(IP_MTU_DISCOVER) |
301 | # if defined(SOL_IP) && defined(IP_MTU_DISCOVER) |
265 | // this I really consider a linux bug. I am neither connected |
302 | // this I really consider a linux bug. I am neither connected |
266 | // nor do I fragment myself. Linux still sets DF and doesn't |
303 | // nor do I fragment myself. Linux still sets DF and doesn't |
267 | // fragment for me sometimes. |
304 | // fragment for me sometimes. |
268 | { |
305 | { |
269 | int oval = IP_PMTUDISC_DONT; |
306 | int oval = IP_PMTUDISC_DONT; |
270 | setsockopt (udpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval); |
307 | setsockopt (dnsv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval); |
271 | } |
308 | } |
272 | #endif |
309 | # endif |
273 | |
310 | |
274 | // standard daemon practise... |
311 | // standard daemon practise... |
275 | { |
312 | { |
276 | int oval = 1; |
313 | int oval = 1; |
277 | setsockopt (dnsv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval); |
314 | setsockopt (dnsv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval); |
… | |
… | |
281 | THISNODE->dns_hostname ? THISNODE->dns_port : 0, |
318 | THISNODE->dns_hostname ? THISNODE->dns_port : 0, |
282 | PROT_DNSv4); |
319 | PROT_DNSv4); |
283 | |
320 | |
284 | if (bind (dnsv4_fd, si.sav4 (), si.salenv4 ())) |
321 | if (bind (dnsv4_fd, si.sav4 (), si.salenv4 ())) |
285 | { |
322 | { |
286 | 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)); |
287 | exit (EXIT_FAILURE); |
324 | exit (EXIT_FAILURE); |
288 | } |
325 | } |
289 | |
326 | |
290 | dnsv4_ev_watcher.start (dnsv4_fd, EVENT_READ); |
327 | dnsv4_ev_watcher.start (dnsv4_fd, EV_READ); |
291 | } |
328 | } |
292 | #endif |
329 | #endif |
293 | |
330 | |
294 | ///////////////////////////////////////////////////////////////////////////// |
331 | ///////////////////////////////////////////////////////////////////////////// |
295 | |
332 | |
… | |
… | |
298 | ///////////////////////////////////////////////////////////////////////////// |
335 | ///////////////////////////////////////////////////////////////////////////// |
299 | |
336 | |
300 | tap = new tap_device (); |
337 | tap = new tap_device (); |
301 | if (!tap) //D this, of course, never catches |
338 | if (!tap) //D this, of course, never catches |
302 | { |
339 | { |
303 | slog (L_ERR, _("cannot create network interface '%s'"), conf.ifname); |
340 | slog (L_ERR, _("cannot create network interface '%s', exiting."), conf.ifname); |
304 | exit (EXIT_FAILURE); |
341 | exit (EXIT_FAILURE); |
305 | } |
342 | } |
306 | |
343 | |
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344 | fcntl (tap->fd, F_SETFD, FD_CLOEXEC); |
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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 | |
307 | if (tap->if_up () && |
349 | if (tap->if_up () && |
308 | !run_script (run_script_cb (this, &vpn::script_if_init), true)) |
350 | !run_script (cb, true)) |
309 | { |
351 | { |
310 | slog (L_ERR, _("interface initialization command '%s' failed, exiting."), |
352 | slog (L_ERR, _("interface initialization command '%s' failed, exiting."), |
311 | tap->if_up ()); |
353 | tap->if_up ()); |
312 | exit (EXIT_FAILURE); |
354 | exit (EXIT_FAILURE); |
313 | } |
355 | } |
314 | |
356 | |
315 | if (!run_script (run_script_cb (this, &vpn::script_if_up), true)) |
357 | cb.set<vpn, &vpn::script_if_up> (this); |
|
|
358 | if (!run_script (cb, true)) |
316 | { |
359 | { |
317 | slog (L_ERR, _("if-up command execution failed, exiting.")); |
360 | slog (L_ERR, _("if-up command execution failed, exiting.")); |
318 | exit (EXIT_FAILURE); |
361 | exit (EXIT_FAILURE); |
319 | } |
362 | } |
320 | |
363 | |
321 | tap_ev_watcher.start (tap->fd, EVENT_READ); |
364 | tap_ev_watcher.start (tap->fd, EV_READ); |
322 | |
365 | |
323 | return 0; |
366 | return 0; |
324 | } |
367 | } |
325 | |
368 | |
326 | bool |
369 | bool |
327 | 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) |
328 | { |
371 | { |
329 | #if defined(SOL_IP) && defined(IP_TOS) |
372 | set_tos (ipv4_fd, ipv4_tos, tos); |
330 | setsockopt (ipv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos); |
|
|
331 | #endif |
|
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332 | 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 ()); |
333 | |
374 | |
334 | return true; |
375 | return true; |
335 | } |
376 | } |
336 | |
377 | |
… | |
… | |
359 | |
400 | |
360 | #if ENABLE_ICMP |
401 | #if ENABLE_ICMP |
361 | bool |
402 | bool |
362 | 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) |
363 | { |
404 | { |
364 | #if defined(SOL_IP) && defined(IP_TOS) |
|
|
365 | setsockopt (icmpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos); |
|
|
366 | #endif |
|
|
367 | |
|
|
368 | pkt->unshift_hdr (4); |
405 | pkt->unshift_hdr (4); |
369 | |
406 | |
370 | icmp_header *hdr = (icmp_header *)&((*pkt)[0]); |
407 | icmp_header *hdr = (icmp_header *)&((*pkt)[0]); |
371 | hdr->type = ::conf.icmp_type; |
408 | hdr->type = ::conf.icmp_type; |
372 | hdr->code = 255; |
409 | hdr->code = 255; |
373 | hdr->checksum = 0; |
410 | hdr->checksum = 0; |
374 | hdr->checksum = ipv4_checksum ((u16 *)hdr, pkt->len); |
411 | hdr->checksum = ipv4_checksum ((u16 *)hdr, pkt->len); |
375 | |
412 | |
|
|
413 | set_tos (icmpv4_fd, icmpv4_tos, tos); |
376 | 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 ()); |
377 | |
415 | |
378 | return true; |
416 | return true; |
379 | } |
417 | } |
380 | #endif |
418 | #endif |
381 | |
419 | |
382 | bool |
420 | bool |
383 | 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) |
384 | { |
422 | { |
385 | #if defined(SOL_IP) && defined(IP_TOS) |
423 | set_tos (udpv4_fd, udpv4_tos, tos); |
386 | setsockopt (udpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos); |
|
|
387 | #endif |
|
|
388 | 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 ()); |
389 | |
425 | |
390 | return true; |
426 | return true; |
391 | } |
427 | } |
392 | |
428 | |
… | |
… | |
403 | { |
439 | { |
404 | // broadcast, this is ugly, but due to the security policy |
440 | // broadcast, this is ugly, but due to the security policy |
405 | // we have to connect to all hosts... |
441 | // we have to connect to all hosts... |
406 | for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c) |
442 | for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c) |
407 | if ((*c)->conf != THISNODE) |
443 | if ((*c)->conf != THISNODE) |
408 | (*c)->inject_data_packet (pkt, true); |
444 | (*c)->inject_data_packet (pkt); |
409 | } |
445 | } |
410 | } |
446 | } |
411 | |
447 | |
412 | void |
448 | void |
413 | vpn::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi) |
449 | vpn::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi) |
414 | { |
450 | { |
415 | unsigned int src = pkt->src (); |
451 | unsigned int src = pkt->src (); |
416 | unsigned int dst = pkt->dst (); |
452 | unsigned int dst = pkt->dst (); |
417 | |
453 | |
418 | 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."), |
419 | (const char *)rsi, pkt->typ (), pkt->src (), pkt->dst (), pkt->len); |
455 | (const char *)rsi, pkt->typ (), pkt->src (), pkt->dst (), pkt->len); |
420 | |
456 | |
421 | if (src == 0 || src > conns.size () |
457 | if (src == 0 || src > conns.size () |
422 | || dst > conns.size () |
458 | || dst > conns.size () |
423 | || pkt->typ () >= vpn_packet::PT_MAX) |
459 | || pkt->typ () >= vpn_packet::PT_MAX) |
424 | 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)."), |
425 | (const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ()); |
461 | (const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ()); |
426 | else if (dst > conns.size ()) |
462 | else if (dst > conns.size ()) |
427 | 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)."), |
428 | (const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ()); |
464 | (const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ()); |
429 | else |
465 | else |
430 | { |
466 | { |
431 | connection *c = conns[src - 1]; |
467 | connection *c = conns[src - 1]; |
432 | |
468 | |
433 | if (dst == 0) |
469 | if (dst == 0) |
434 | slog (L_WARN, _("%s(%s): received broadcast (protocol violation)"), |
470 | slog (L_WARN, _("%s(%s): received broadcast (protocol violation)."), |
435 | c->conf->nodename, (const char *)rsi); |
471 | c->conf->nodename, (const char *)rsi); |
436 | else if (dst != THISNODE->id) |
472 | else if (dst != THISNODE->id) |
437 | { |
473 | { |
438 | if (THISNODE->routerprio) |
474 | if (THISNODE->routerprio) |
439 | // the tos setting gets lost here. who cares. |
475 | // the tos setting gets lost here. who cares. |
440 | conns[dst - 1]->inject_vpn_packet (pkt); |
476 | conns[dst - 1]->inject_vpn_packet (pkt); |
441 | else |
477 | else |
442 | slog (L_WARN, |
478 | slog (L_WARN, |
443 | _("%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?)."), |
444 | c->conf->nodename, (const char *)rsi, |
480 | c->conf->nodename, (const char *)rsi, |
445 | conns[dst - 1]->conf->nodename); |
481 | conns[dst - 1]->conf->nodename); |
446 | } |
482 | } |
447 | else |
483 | else |
448 | c->recv_vpn_packet (pkt, rsi); |
484 | c->recv_vpn_packet (pkt, rsi); |
… | |
… | |
454 | { |
490 | { |
455 | switch (si.prot) |
491 | switch (si.prot) |
456 | { |
492 | { |
457 | case PROT_IPv4: |
493 | case PROT_IPv4: |
458 | return send_ipv4_packet (pkt, si, tos); |
494 | return send_ipv4_packet (pkt, si, tos); |
|
|
495 | |
459 | case PROT_UDPv4: |
496 | case PROT_UDPv4: |
460 | return send_udpv4_packet (pkt, si, tos); |
497 | return send_udpv4_packet (pkt, si, tos); |
|
|
498 | |
461 | #if ENABLE_TCP |
499 | #if ENABLE_TCP |
462 | case PROT_TCPv4: |
500 | case PROT_TCPv4: |
463 | return send_tcpv4_packet (pkt, si, tos); |
501 | return send_tcpv4_packet (pkt, si, tos); |
464 | #endif |
502 | #endif |
465 | #if ENABLE_ICMP |
503 | #if ENABLE_ICMP |
… | |
… | |
468 | #endif |
506 | #endif |
469 | #if ENABLE_DNS |
507 | #if ENABLE_DNS |
470 | case PROT_DNSv4: |
508 | case PROT_DNSv4: |
471 | return send_dnsv4_packet (pkt, si, tos); |
509 | return send_dnsv4_packet (pkt, si, tos); |
472 | #endif |
510 | #endif |
473 | |
|
|
474 | default: |
511 | default: |
475 | 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); |
476 | } |
513 | } |
477 | |
514 | |
478 | return false; |
515 | return false; |
479 | } |
516 | } |
480 | |
517 | |
481 | void |
518 | inline void |
482 | vpn::ipv4_ev (io_watcher &w, short revents) |
519 | vpn::ipv4_ev (ev::io &w, int revents) |
483 | { |
520 | { |
484 | if (revents & EVENT_READ) |
521 | if (revents & EV_READ) |
485 | { |
522 | { |
486 | vpn_packet *pkt = new vpn_packet; |
523 | vpn_packet *pkt = new vpn_packet; |
487 | struct sockaddr_in sa; |
524 | struct sockaddr_in sa; |
488 | socklen_t sa_len = sizeof (sa); |
525 | socklen_t sa_len = sizeof (sa); |
489 | int len; |
526 | int len; |
… | |
… | |
502 | recv_vpn_packet (pkt, si); |
539 | recv_vpn_packet (pkt, si); |
503 | } |
540 | } |
504 | else |
541 | else |
505 | { |
542 | { |
506 | // probably ECONNRESET or somesuch |
543 | // probably ECONNRESET or somesuch |
507 | slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno)); |
544 | slog (L_DEBUG, _("%s: %s."), (const char *)si, strerror (errno)); |
508 | } |
545 | } |
509 | |
546 | |
510 | delete pkt; |
547 | delete pkt; |
511 | } |
548 | } |
512 | else |
549 | else |
513 | { |
550 | { |
514 | slog (L_ERR, |
551 | slog (L_ERR, |
515 | _("FATAL: unknown revents %08x in socket, terminating\n"), |
552 | _("FATAL: unknown revents %08x in socket, exiting.\n"), |
516 | revents); |
553 | revents); |
517 | exit (EXIT_FAILURE); |
554 | exit (EXIT_FAILURE); |
518 | } |
555 | } |
519 | } |
556 | } |
520 | |
557 | |
521 | #if ENABLE_ICMP |
558 | #if ENABLE_ICMP |
522 | void |
559 | inline void |
523 | vpn::icmpv4_ev (io_watcher &w, short revents) |
560 | vpn::icmpv4_ev (ev::io &w, int revents) |
524 | { |
561 | { |
525 | if (revents & EVENT_READ) |
562 | if (revents & EV_READ) |
526 | { |
563 | { |
527 | vpn_packet *pkt = new vpn_packet; |
564 | vpn_packet *pkt = new vpn_packet; |
528 | struct sockaddr_in sa; |
565 | struct sockaddr_in sa; |
529 | socklen_t sa_len = sizeof (sa); |
566 | socklen_t sa_len = sizeof (sa); |
530 | int len; |
567 | int len; |
… | |
… | |
550 | } |
587 | } |
551 | } |
588 | } |
552 | else |
589 | else |
553 | { |
590 | { |
554 | // probably ECONNRESET or somesuch |
591 | // probably ECONNRESET or somesuch |
555 | slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno)); |
592 | slog (L_DEBUG, _("%s: %s."), (const char *)si, strerror (errno)); |
556 | } |
593 | } |
557 | |
594 | |
558 | delete pkt; |
595 | delete pkt; |
559 | } |
596 | } |
560 | else |
597 | else |
561 | { |
598 | { |
562 | slog (L_ERR, |
599 | slog (L_ERR, |
563 | _("FATAL: unknown revents %08x in socket, terminating\n"), |
600 | _("FATAL: unknown revents %08x in socket, exiting.\n"), |
564 | revents); |
601 | revents); |
565 | exit (EXIT_FAILURE); |
602 | exit (EXIT_FAILURE); |
566 | } |
603 | } |
567 | } |
604 | } |
568 | #endif |
605 | #endif |
569 | |
606 | |
570 | void |
607 | inline void |
571 | vpn::udpv4_ev (io_watcher &w, short revents) |
608 | vpn::udpv4_ev (ev::io &w, int revents) |
572 | { |
609 | { |
573 | if (revents & EVENT_READ) |
610 | if (revents & EV_READ) |
574 | { |
611 | { |
575 | vpn_packet *pkt = new vpn_packet; |
612 | vpn_packet *pkt = new vpn_packet; |
576 | struct sockaddr_in sa; |
613 | struct sockaddr_in sa; |
577 | socklen_t sa_len = sizeof (sa); |
614 | socklen_t sa_len = sizeof (sa); |
578 | int len; |
615 | int len; |
… | |
… | |
588 | recv_vpn_packet (pkt, si); |
625 | recv_vpn_packet (pkt, si); |
589 | } |
626 | } |
590 | else |
627 | else |
591 | { |
628 | { |
592 | // probably ECONNRESET or somesuch |
629 | // probably ECONNRESET or somesuch |
593 | 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)); |
594 | } |
631 | } |
595 | |
632 | |
596 | delete pkt; |
633 | delete pkt; |
597 | } |
634 | } |
598 | else |
635 | else |
599 | { |
636 | { |
600 | slog (L_ERR, |
637 | slog (L_ERR, |
601 | _("FATAL: unknown revents %08x in socket, terminating\n"), |
638 | _("FATAL: unknown revents %08x in socket, exiting.\n"), |
602 | revents); |
639 | revents); |
603 | exit (EXIT_FAILURE); |
640 | exit (EXIT_FAILURE); |
604 | } |
641 | } |
605 | } |
642 | } |
606 | |
643 | |
607 | void |
644 | inline void |
608 | vpn::tap_ev (io_watcher &w, short revents) |
645 | vpn::tap_ev (ev::io &w, int revents) |
609 | { |
646 | { |
610 | if (revents & EVENT_READ) |
647 | if (revents & EV_READ) |
611 | { |
648 | { |
612 | /* process data */ |
649 | /* process data */ |
613 | tap_packet *pkt; |
650 | tap_packet *pkt; |
614 | |
651 | |
615 | pkt = tap->recv (); |
652 | pkt = tap->recv (); |
… | |
… | |
644 | } |
681 | } |
645 | else |
682 | else |
646 | abort (); |
683 | abort (); |
647 | } |
684 | } |
648 | |
685 | |
649 | void |
686 | inline void |
650 | vpn::event_cb (time_watcher &w) |
687 | vpn::event_cb (ev::timer &w, int) |
651 | { |
688 | { |
652 | if (events) |
689 | if (events) |
653 | { |
690 | { |
654 | if (events & EVENT_SHUTDOWN) |
691 | if (events & EVENT_SHUTDOWN) |
655 | { |
692 | { |
656 | slog (L_INFO, _("preparing shutdown...")); |
693 | slog (L_INFO, _("preparing shutdown...")); |
657 | |
694 | |
658 | shutdown_all (); |
695 | shutdown_all (); |
659 | remove_pid (conf.pidfilename); |
696 | remove_pid (conf.pidfilename); |
660 | slog (L_INFO, _("terminating")); |
697 | slog (L_INFO, _("exiting.")); |
661 | exit (EXIT_SUCCESS); |
698 | exit (EXIT_SUCCESS); |
662 | } |
699 | } |
663 | |
700 | |
664 | if (events & EVENT_RECONNECT) |
701 | if (events & EVENT_RECONNECT) |
665 | { |
702 | { |
666 | slog (L_INFO, _("forced reconnect")); |
703 | slog (L_INFO, _("forced reconnect.")); |
667 | |
704 | |
668 | reconnect_all (); |
705 | reconnect_all (); |
669 | } |
706 | } |
670 | |
707 | |
671 | events = 0; |
708 | events = 0; |
… | |
… | |
687 | |
724 | |
688 | conns.clear (); |
725 | conns.clear (); |
689 | |
726 | |
690 | connection_init (); |
727 | connection_init (); |
691 | |
728 | |
692 | for (configuration::node_vector::iterator i = conf.nodes.begin (); |
729 | for (configuration::node_vector::iterator i = conf.nodes.begin (); i != conf.nodes.end (); ++i) |
693 | i != conf.nodes.end (); ++i) |
730 | conns.push_back (new connection (this, *i)); |
694 | { |
731 | |
695 | connection *conn = new connection (this, *i); |
732 | for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c) |
696 | conns.push_back (conn); |
|
|
697 | conn->establish_connection (); |
733 | (*c)->establish_connection (); |
698 | } |
|
|
699 | } |
734 | } |
700 | |
735 | |
701 | connection *vpn::find_router () |
736 | bool vpn::can_direct (conf_node *src, conf_node *dst) const |
702 | { |
737 | { |
703 | 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 | { |
704 | connection *router = 0; |
749 | connection *router = 0; |
705 | |
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 | { |
706 | for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i) |
806 | for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i) |
707 | { |
807 | { |
708 | connection *c = *i; |
808 | connection *o = *i; |
709 | |
809 | |
710 | if (c->conf->routerprio > prio |
810 | if (!o->is_direct |
711 | && c->connectmode == conf_node::C_ALWAYS // so we don't drop the connection if in use |
811 | && o->si.valid () |
712 | && c->ictx && c->octx |
812 | && c->si != o->si |
713 | && c->conf != THISNODE) // redundant, since ictx==octx==0 always on thisnode |
813 | && c == find_router_for (o)) |
714 | { |
|
|
715 | prio = c->conf->routerprio; |
|
|
716 | router = c; |
|
|
717 | } |
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 | } |
718 | } |
819 | } |
719 | |
|
|
720 | return router; |
|
|
721 | } |
820 | } |
722 | |
821 | |
723 | void vpn::send_connect_request (int id) |
822 | void vpn::send_connect_request (connection *c) |
724 | { |
823 | { |
725 | connection *c = find_router (); |
824 | connection *r = find_router_for (c); |
726 | |
825 | |
727 | 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); |
728 | c->send_connect_request (id); |
830 | r->send_connect_request (c->conf->id); |
|
|
831 | } |
729 | else |
832 | else |
730 | // no router found, aggressively connect to all routers |
833 | slog (L_DEBUG, _("%s: no way to connect and no router found: unable to connect."), |
731 | for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i) |
834 | c->conf->nodename); |
732 | if ((*i)->conf->routerprio && (*i)->conf != THISNODE) |
|
|
733 | (*i)->establish_connection (); |
|
|
734 | } |
835 | } |
735 | |
836 | |
736 | void |
837 | void |
737 | connection::dump_status () |
838 | connection::dump_status () |
738 | { |
839 | { |
739 | slog (L_NOTICE, _("node %s (id %d)"), conf->nodename, conf->id); |
840 | slog (L_NOTICE, _("node %s (id %d)"), conf->nodename, conf->id); |
740 | slog (L_NOTICE, _(" connectmode %d (%d) / sockaddr %s / minor %d"), |
841 | slog (L_NOTICE, _(" connectmode %d (%d) / sockaddr %s / minor %d"), |
741 | connectmode, conf->connectmode, (const char *)si, (int)prot_minor); |
842 | connectmode, conf->connectmode, (const char *)si, (int)prot_minor); |
742 | 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"), |
743 | (long)ictx, (long)octx, (int)oseqno, (int)retry_cnt); |
844 | (long)ictx, (long)octx, (int)oseqno, (int)retry_cnt); |
744 | slog (L_NOTICE, _(" establish_conn %ld / rekey %ld / keepalive %ld"), |
|
|
745 | (long)(establish_connection.at), (long)(rekey.at), (long)(keepalive.at)); |
|
|
746 | } |
845 | } |
747 | |
846 | |
748 | void |
847 | void |
749 | vpn::dump_status () |
848 | vpn::dump_status () |
750 | { |
849 | { |
751 | slog (L_NOTICE, _("BEGIN status dump (%ld)"), (long)NOW); |
850 | slog (L_NOTICE, _("BEGIN status dump (%ld)"), (long)ev_now ()); |
752 | |
851 | |
753 | for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c) |
852 | for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c) |
754 | (*c)->dump_status (); |
853 | (*c)->dump_status (); |
755 | |
854 | |
756 | slog (L_NOTICE, _("END status dump")); |
855 | slog (L_NOTICE, _("END status dump")); |
757 | } |
856 | } |
758 | |
857 | |
759 | vpn::vpn (void) |
858 | vpn::vpn (void) |
|
|
859 | { |
760 | : event (this, &vpn::event_cb) |
860 | event .set<vpn, &vpn::event_cb > (this); |
761 | , udpv4_ev_watcher (this, &vpn::udpv4_ev) |
861 | udpv4_ev_watcher .set<vpn, &vpn::udpv4_ev > (this); |
762 | , ipv4_ev_watcher (this, &vpn::ipv4_ev) |
862 | ipv4_ev_watcher .set<vpn, &vpn::ipv4_ev > (this); |
763 | #if ENABLE_TCP |
863 | #if ENABLE_TCP |
764 | , tcpv4_ev_watcher (this, &vpn::tcpv4_ev) |
864 | tcpv4_ev_watcher .set<vpn, &vpn::tcpv4_ev > (this); |
765 | #endif |
865 | #endif |
766 | #if ENABLE_ICMP |
866 | #if ENABLE_ICMP |
767 | , icmpv4_ev_watcher(this, &vpn::icmpv4_ev) |
867 | icmpv4_ev_watcher.set<vpn, &vpn::icmpv4_ev> (this); |
768 | #endif |
868 | #endif |
769 | #if ENABLE_DNS |
869 | #if ENABLE_DNS |
770 | , dnsv4_ev_watcher (this, &vpn::dnsv4_ev) |
870 | dnsv4_ev_watcher .set<vpn, &vpn::dnsv4_ev > (this); |
771 | #endif |
871 | #endif |
772 | , tap_ev_watcher (this, &vpn::tap_ev) |
872 | tap_ev_watcher .set<vpn, &vpn::tap_ev > (this); |
773 | { |
|
|
774 | } |
873 | } |
775 | |
874 | |
776 | vpn::~vpn () |
875 | vpn::~vpn () |
777 | { |
876 | { |
778 | } |
877 | } |