1 | /* |
1 | /* |
2 | vpn.C -- handle the protocol, encryption, handshaking etc. |
2 | vpn.C -- handle the protocol, encryption, handshaking etc. |
|
|
3 | Copyright (C) 2003-2008,2010,2011 Marc Lehmann <gvpe@schmorp.de> |
3 | |
4 | |
|
|
5 | This file is part of GVPE. |
|
|
6 | |
4 | This program is free software; you can redistribute it and/or modify |
7 | GVPE is free software; you can redistribute it and/or modify it |
5 | 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 |
6 | the Free Software Foundation; either version 2 of the License, or |
9 | Free Software Foundation; either version 3 of the License, or (at your |
7 | (at your option) any later version. |
10 | option) any later version. |
8 | |
11 | |
9 | 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 |
10 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
13 | WITHOUT ANY WARRANTY; without even the implied warranty of |
11 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General |
12 | GNU General Public License for more details. |
15 | Public License for more details. |
13 | |
16 | |
14 | 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 |
15 | along with this program; if not, write to the Free Software |
18 | with this program; if not, see <http://www.gnu.org/licenses/>. |
16 | Foundation, Inc. 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
19 | |
|
|
20 | Additional permission under GNU GPL version 3 section 7 |
|
|
21 | |
|
|
22 | If you modify this Program, or any covered work, by linking or |
|
|
23 | combining it with the OpenSSL project's OpenSSL library (or a modified |
|
|
24 | version of that library), containing parts covered by the terms of the |
|
|
25 | OpenSSL or SSLeay licenses, the licensors of this Program grant you |
|
|
26 | additional permission to convey the resulting work. Corresponding |
|
|
27 | Source for a non-source form of such a combination shall include the |
|
|
28 | source code for the parts of OpenSSL used as well as that of the |
|
|
29 | covered work. |
17 | */ |
30 | */ |
18 | |
31 | |
19 | #include "config.h" |
32 | #include "config.h" |
20 | |
33 | |
21 | #include <list> |
34 | #include <list> |
22 | |
35 | |
|
|
36 | #include <cstdio> |
|
|
37 | #include <cstring> |
23 | #include <cstdlib> |
38 | #include <cstdlib> |
24 | #include <cstring> |
|
|
25 | #include <cstdio> |
|
|
26 | |
39 | |
27 | #include <sys/types.h> |
40 | #include <sys/types.h> |
28 | #include <sys/socket.h> |
41 | #include <sys/socket.h> |
29 | #include <sys/poll.h> |
|
|
30 | #include <sys/wait.h> |
42 | #include <sys/wait.h> |
31 | #include <netinet/in.h> |
|
|
32 | #include <arpa/inet.h> |
|
|
33 | #include <errno.h> |
43 | #include <errno.h> |
34 | #include <time.h> |
44 | #include <time.h> |
35 | #include <unistd.h> |
45 | #include <unistd.h> |
|
|
46 | #include <fcntl.h> |
|
|
47 | #include <sys/socket.h> |
|
|
48 | |
|
|
49 | #include "netcompat.h" |
36 | |
50 | |
37 | #include "pidfile.h" |
51 | #include "pidfile.h" |
38 | |
52 | |
39 | #include "connection.h" |
53 | #include "connection.h" |
40 | #include "util.h" |
54 | #include "util.h" |
41 | #include "vpn.h" |
55 | #include "vpn.h" |
42 | |
56 | |
43 | #if ENABLE_TCP |
57 | vpn network; // THE vpn (bad design...) |
44 | # include <map> |
|
|
45 | # include <unistd.h> |
|
|
46 | # include <fcntl.h> |
|
|
47 | # include <sys/poll.h> |
|
|
48 | #endif |
|
|
49 | |
58 | |
50 | ///////////////////////////////////////////////////////////////////////////// |
59 | ///////////////////////////////////////////////////////////////////////////// |
51 | |
60 | |
52 | const char *vpn::script_if_up () |
61 | static void inline |
|
|
62 | set_tos (int fd, int &tos_prev, int tos) |
|
|
63 | { |
|
|
64 | #if defined(SOL_IP) && defined(IP_TOS) |
|
|
65 | if (tos_prev == tos) |
|
|
66 | return; |
|
|
67 | |
|
|
68 | tos_prev = tos; |
|
|
69 | setsockopt (fd, SOL_IP, IP_TOS, &tos, sizeof tos); |
|
|
70 | #endif |
|
|
71 | } |
|
|
72 | |
|
|
73 | void |
|
|
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 |
56 | int mtu = conf.mtu - ETH_OVERHEAD - VPE_OVERHEAD - MAX_OVERHEAD; |
78 | int mtu = conf.mtu - ETH_OVERHEAD - VPE_OVERHEAD - MAX_OVERHEAD; |
57 | mtu += ETH_OVERHEAD - 6 - 6; // now we have the data portion |
79 | mtu += ETH_OVERHEAD - 6 - 6; // now we have the data portion |
58 | mtu -= mtu % EVP_CIPHER_block_size (CIPHER); // round |
80 | mtu -= mtu % EVP_CIPHER_block_size (CIPHER); // round |
59 | mtu -= ETH_OVERHEAD - 6 - 6; // and get interface mtu again |
81 | mtu -= ETH_OVERHEAD - 6 - 6; // and get interface mtu again |
60 | |
82 | |
61 | char *env; |
83 | char *env; |
62 | asprintf (&env, "CONFBASE=%s", confbase); |
84 | asprintf (&env, "CONFBASE=%s", confbase); putenv (env); |
63 | putenv (env); |
|
|
64 | asprintf (&env, "NODENAME=%s", THISNODE->nodename); |
|
|
65 | putenv (env); |
|
|
66 | asprintf (&env, "NODEID=%d", THISNODE->id); |
|
|
67 | putenv (env); |
|
|
68 | asprintf (&env, "IFNAME=%s", tap->interface ()); |
85 | asprintf (&env, "IFNAME=%s", tap->interface ()); putenv (env); |
69 | putenv (env); |
86 | asprintf (&env, "IFTYPE=%s", IFTYPE); putenv (env); |
|
|
87 | asprintf (&env, "IFSUBTYPE=%s", IFSUBTYPE); putenv (env); |
70 | asprintf (&env, "MTU=%d", mtu); |
88 | asprintf (&env, "MTU=%d", mtu); putenv (env); |
71 | putenv (env); |
89 | asprintf (&env, "NODES=%d", conns.size ()); putenv (env); |
72 | asprintf (&env, "MAC=%02x:%02x:%02x:%02x:%02x:%02x", |
90 | asprintf (&env, "NODEID=%d", THISNODE->id); putenv (env); |
73 | 0xfe, 0xfd, 0x80, 0x00, THISNODE->id >> 8, |
|
|
74 | THISNODE->id & 0xff); |
|
|
75 | putenv (env); |
|
|
76 | |
91 | |
|
|
92 | conns [THISNODE->id - 1]->script_init_env (""); |
|
|
93 | |
|
|
94 | for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c) |
|
|
95 | { |
|
|
96 | char ext[16]; |
|
|
97 | snprintf (ext, 16, "_%d", (*c)->conf->id); |
|
|
98 | (*c)->script_init_env (ext); |
|
|
99 | } |
|
|
100 | } |
|
|
101 | |
|
|
102 | inline const char * |
|
|
103 | vpn::script_if_init () |
|
|
104 | { |
|
|
105 | script_init_env (); |
|
|
106 | |
|
|
107 | return tap->if_up (); |
|
|
108 | } |
|
|
109 | |
|
|
110 | inline const char * |
|
|
111 | vpn::script_if_up () |
|
|
112 | { |
|
|
113 | script_init_env (); |
|
|
114 | |
|
|
115 | char *filename; |
|
|
116 | asprintf (&filename, |
|
|
117 | "%s/%s", |
|
|
118 | confbase, |
77 | return ::conf.script_if_up ? ::conf.script_if_up : "if-up"; |
119 | ::conf.script_if_up ? ::conf.script_if_up : "if-up"); |
|
|
120 | |
|
|
121 | return filename; |
|
|
122 | } |
|
|
123 | |
|
|
124 | int |
|
|
125 | vpn::setup_socket (u8 prot, int family, int type, int proto) |
|
|
126 | { |
|
|
127 | int fd = socket (family, type, proto); |
|
|
128 | |
|
|
129 | if (fd < 0) |
|
|
130 | { |
|
|
131 | slog (L_ERR, _("unable to create %s socket: %s."), strprotocol (prot), strerror (errno)); |
|
|
132 | return fd; |
|
|
133 | } |
|
|
134 | |
|
|
135 | fcntl (fd, F_SETFL, O_NONBLOCK); |
|
|
136 | fcntl (fd, F_SETFD, FD_CLOEXEC); |
|
|
137 | |
|
|
138 | #ifdef SO_MARK |
|
|
139 | if (::conf.nfmark) |
|
|
140 | if (setsockopt (fd, SOL_SOCKET, SO_MARK, &::conf.nfmark, sizeof ::conf.nfmark)) |
|
|
141 | slog (L_WARN, _("unable to set nfmark on %s socket: %s"), strprotocol (prot), strerror (errno)); |
|
|
142 | #endif |
|
|
143 | |
|
|
144 | return fd; |
78 | } |
145 | } |
79 | |
146 | |
80 | int |
147 | int |
81 | vpn::setup () |
148 | vpn::setup () |
82 | { |
149 | { |
|
|
150 | int success = 0; |
|
|
151 | |
|
|
152 | #if 1//D2 |
|
|
153 | ipv42_tos = -1; |
83 | udpv4_fd = -1; |
154 | ipv42_fd = -1; |
84 | |
155 | |
85 | if (THISNODE->protocols & PROT_UDPv4) |
156 | if (THISNODE->protocols & PROT_IPv42 && ::conf.ip_proto) |
86 | { |
157 | { |
87 | udpv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP); |
158 | ipv42_fd = setup_socket (PROT_IPv42, PF_INET, SOCK_RAW, ::conf.ip2_proto); |
88 | |
159 | |
89 | if (udpv4_fd < 0) |
160 | if (ipv42_fd < 0) |
90 | return -1; |
161 | return -1; |
91 | |
162 | |
92 | sockinfo si (THISNODE, PROT_UDPv4); |
163 | #if defined(SOL_IP) && defined(IP_MTU_DISCOVER) |
93 | |
|
|
94 | if (bind (udpv4_fd, si.sav4 (), si.salenv4 ())) |
|
|
95 | { |
|
|
96 | slog (L_ERR, _("can't bind udpv4 on %s: %s"), (const char *)si, strerror (errno)); |
|
|
97 | exit (1); |
|
|
98 | } |
|
|
99 | |
|
|
100 | #ifdef IP_MTU_DISCOVER |
|
|
101 | // this I really consider a linux bug. I am neither connected |
164 | // this I really consider a linux bug. I am neither connected |
102 | // nor do I fragment myself. Linux still sets DF and doesn't |
165 | // nor do I fragment myself. Linux still sets DF and doesn't |
103 | // fragment for me sometimes. |
166 | // fragment for me sometimes. |
104 | { |
167 | { |
105 | int oval = IP_PMTUDISC_DONT; |
168 | int oval = IP_PMTUDISC_DONT; |
106 | setsockopt (udpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval); |
169 | setsockopt (ipv42_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval); |
107 | } |
170 | } |
108 | #endif |
171 | #endif |
109 | |
172 | |
110 | // standard daemon practise... |
173 | sockinfo si (THISNODE, PROT_IPv42); |
|
|
174 | |
|
|
175 | if (bind (ipv42_fd, si.sav4 (), si.salenv4 ())) |
111 | { |
176 | { |
112 | int oval = 1; |
177 | slog (L_ERR, _("can't bind ipv42 socket on %s: %s, exiting."), (const char *)si, strerror (errno)); |
113 | setsockopt (udpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval); |
178 | return -1; |
114 | } |
179 | } |
115 | |
180 | |
116 | udpv4_ev_watcher.start (udpv4_fd, POLLIN); |
181 | ipv42_ev_watcher.start (ipv42_fd, EV_READ); |
|
|
182 | ++success; |
117 | } |
183 | } |
|
|
184 | else |
|
|
185 | THISNODE->protocols &= ~PROT_IPv42; |
|
|
186 | #endif |
118 | |
187 | |
|
|
188 | ipv4_tos = -1; |
119 | ipv4_fd = -1; |
189 | ipv4_fd = -1; |
|
|
190 | |
120 | if (THISNODE->protocols & PROT_IPv4) |
191 | if (THISNODE->protocols & PROT_IPv4 && ::conf.ip_proto) |
121 | { |
192 | { |
122 | ipv4_fd = socket (PF_INET, SOCK_RAW, ::conf.ip_proto); |
193 | ipv4_fd = setup_socket (PROT_IPv4, PF_INET, SOCK_RAW, ::conf.ip_proto); |
123 | |
194 | |
124 | if (ipv4_fd < 0) |
195 | if (ipv4_fd < 0) |
125 | return -1; |
196 | return -1; |
126 | |
197 | |
127 | sockinfo si (THISNODE, PROT_IPv4); |
198 | #if defined(SOL_IP) && defined(IP_MTU_DISCOVER) |
128 | |
|
|
129 | if (bind (ipv4_fd, si.sav4 (), si.salenv4 ())) |
|
|
130 | { |
|
|
131 | slog (L_ERR, _("can't bind ipv4 socket on %s: %s"), (const char *)si, strerror (errno)); |
|
|
132 | exit (1); |
|
|
133 | } |
|
|
134 | |
|
|
135 | #ifdef IP_MTU_DISCOVER |
|
|
136 | // this I really consider a linux bug. I am neither connected |
199 | // this I really consider a linux bug. I am neither connected |
137 | // nor do I fragment myself. Linux still sets DF and doesn't |
200 | // nor do I fragment myself. Linux still sets DF and doesn't |
138 | // fragment for me sometimes. |
201 | // fragment for me sometimes. |
139 | { |
202 | { |
140 | int oval = IP_PMTUDISC_DONT; |
203 | int oval = IP_PMTUDISC_DONT; |
141 | setsockopt (ipv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval); |
204 | setsockopt (ipv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval); |
142 | } |
205 | } |
143 | #endif |
206 | #endif |
144 | |
207 | |
|
|
208 | sockinfo si (THISNODE, PROT_IPv4); |
|
|
209 | |
|
|
210 | if (bind (ipv4_fd, si.sav4 (), si.salenv4 ())) |
|
|
211 | { |
|
|
212 | slog (L_ERR, _("can't bind ipv4 socket on %s: %s, exiting."), (const char *)si, strerror (errno)); |
|
|
213 | return -1; |
|
|
214 | } |
|
|
215 | |
145 | ipv4_ev_watcher.start (ipv4_fd, POLLIN); |
216 | ipv4_ev_watcher.start (ipv4_fd, EV_READ); |
|
|
217 | ++success; |
|
|
218 | } |
|
|
219 | else |
|
|
220 | THISNODE->protocols &= ~PROT_IPv4; |
|
|
221 | |
|
|
222 | udpv4_tos = -1; |
|
|
223 | udpv4_fd = -1; |
|
|
224 | |
|
|
225 | if (THISNODE->protocols & PROT_UDPv4 && THISNODE->udp_port) |
|
|
226 | { |
|
|
227 | udpv4_fd = setup_socket (PROT_UDPv4, PF_INET, SOCK_DGRAM, IPPROTO_UDP); |
|
|
228 | |
|
|
229 | if (udpv4_fd < 0) |
|
|
230 | return -1; |
|
|
231 | |
|
|
232 | // standard daemon practise... |
|
|
233 | { |
|
|
234 | int oval = 1; |
|
|
235 | setsockopt (udpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval); |
146 | } |
236 | } |
|
|
237 | |
|
|
238 | #if defined(SOL_IP) && defined(IP_MTU_DISCOVER) |
|
|
239 | // this I really consider a linux bug. I am neither connected |
|
|
240 | // nor do I fragment myself. Linux still sets DF and doesn't |
|
|
241 | // fragment for me sometimes. |
|
|
242 | { |
|
|
243 | int oval = IP_PMTUDISC_DONT; |
|
|
244 | setsockopt (udpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval); |
|
|
245 | } |
|
|
246 | #endif |
|
|
247 | |
|
|
248 | sockinfo si (THISNODE, PROT_UDPv4); |
|
|
249 | |
|
|
250 | if (bind (udpv4_fd, si.sav4 (), si.salenv4 ())) |
|
|
251 | { |
|
|
252 | slog (L_ERR, _("can't bind udpv4 on %s: %s, exiting."), (const char *)si, strerror (errno)); |
|
|
253 | return -1; |
|
|
254 | } |
|
|
255 | |
|
|
256 | udpv4_ev_watcher.start (udpv4_fd, EV_READ); |
|
|
257 | ++success; |
|
|
258 | } |
|
|
259 | else |
|
|
260 | THISNODE->protocols &= ~PROT_UDPv4; |
|
|
261 | |
|
|
262 | icmpv4_tos = -1; |
|
|
263 | icmpv4_fd = -1; |
|
|
264 | |
|
|
265 | #if ENABLE_ICMP |
|
|
266 | if (THISNODE->protocols & PROT_ICMPv4) |
|
|
267 | { |
|
|
268 | icmpv4_fd = setup_socket (PROT_ICMPv4, PF_INET, SOCK_RAW, IPPROTO_ICMP); |
|
|
269 | |
|
|
270 | if (icmpv4_fd < 0) |
|
|
271 | return -1; |
|
|
272 | |
|
|
273 | #ifdef ICMP_FILTER |
|
|
274 | { |
|
|
275 | icmp_filter oval; |
|
|
276 | oval.data = 0xffffffff; |
|
|
277 | if (::conf.icmp_type < 32) |
|
|
278 | oval.data &= ~(1 << ::conf.icmp_type); |
|
|
279 | |
|
|
280 | setsockopt (icmpv4_fd, SOL_RAW, ICMP_FILTER, &oval, sizeof oval); |
|
|
281 | } |
|
|
282 | #endif |
|
|
283 | |
|
|
284 | #if defined(SOL_IP) && defined(IP_MTU_DISCOVER) |
|
|
285 | // this I really consider a linux bug. I am neither connected |
|
|
286 | // nor do I fragment myself. Linux still sets DF and doesn't |
|
|
287 | // fragment for me sometimes. |
|
|
288 | { |
|
|
289 | int oval = IP_PMTUDISC_DONT; |
|
|
290 | setsockopt (icmpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval); |
|
|
291 | } |
|
|
292 | #endif |
|
|
293 | |
|
|
294 | sockinfo si (THISNODE, PROT_ICMPv4); |
|
|
295 | |
|
|
296 | if (bind (icmpv4_fd, si.sav4 (), si.salenv4 ())) |
|
|
297 | { |
|
|
298 | slog (L_ERR, _("can't bind icmpv4 on %s: %s, exiting."), (const char *)si, strerror (errno)); |
|
|
299 | return -1; |
|
|
300 | } |
|
|
301 | |
|
|
302 | icmpv4_ev_watcher.start (icmpv4_fd, EV_READ); |
|
|
303 | ++success; |
|
|
304 | } |
|
|
305 | #endif |
|
|
306 | |
|
|
307 | tcpv4_fd = -1; |
147 | |
308 | |
148 | #if ENABLE_TCP |
309 | #if ENABLE_TCP |
149 | if (THISNODE->protocols & PROT_TCPv4) |
310 | if (THISNODE->protocols & PROT_TCPv4 && THISNODE->tcp_port) |
150 | { |
311 | { |
151 | tcpv4_fd = socket (PF_INET, SOCK_STREAM, IPPROTO_TCP); |
312 | tcpv4_fd = setup_socket (PROT_TCPv4, PF_INET, SOCK_STREAM, IPPROTO_TCP); |
152 | |
313 | |
153 | if (tcpv4_fd < 0) |
314 | if (tcpv4_fd < 0) |
154 | return -1; |
315 | return -1; |
155 | |
316 | |
156 | sockinfo si (THISNODE, PROT_TCPv4); |
|
|
157 | |
|
|
158 | if (bind (tcpv4_fd, si.sav4 (), si.salenv4 ())) |
|
|
159 | { |
|
|
160 | slog (L_ERR, _("can't bind tcpv4 on %s: %s"), (const char *)si, strerror (errno)); |
|
|
161 | exit (1); |
|
|
162 | } |
|
|
163 | |
|
|
164 | if (listen (tcpv4_fd, 5)) |
|
|
165 | { |
|
|
166 | slog (L_ERR, _("can't listen tcpv4 on %s: %s"), (const char *)si, strerror (errno)); |
|
|
167 | exit (1); |
|
|
168 | } |
|
|
169 | |
|
|
170 | // standard daemon practise... |
317 | // standard daemon practise... |
171 | { |
318 | { |
172 | int oval = 1; |
319 | int oval = 1; |
173 | setsockopt (tcpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval); |
320 | setsockopt (tcpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval); |
174 | } |
321 | } |
175 | |
322 | |
|
|
323 | sockinfo si (THISNODE, PROT_TCPv4); |
|
|
324 | |
|
|
325 | if (bind (tcpv4_fd, si.sav4 (), si.salenv4 ())) |
|
|
326 | { |
|
|
327 | slog (L_ERR, _("can't bind tcpv4 on %s: %s, exiting."), (const char *)si, strerror (errno)); |
|
|
328 | return -1; |
|
|
329 | } |
|
|
330 | |
|
|
331 | if (listen (tcpv4_fd, 5)) |
|
|
332 | { |
|
|
333 | slog (L_ERR, _("can't listen tcpv4 on %s: %s, exiting."), (const char *)si, strerror (errno)); |
|
|
334 | return -1; |
|
|
335 | } |
|
|
336 | |
176 | tcpv4_accept_watcher.start (tcpv4_fd, POLLIN); |
337 | tcpv4_ev_watcher.start (tcpv4_fd, EV_READ); |
|
|
338 | ++success; |
|
|
339 | } |
|
|
340 | else |
|
|
341 | THISNODE->protocols &= ~PROT_TCPv4; |
|
|
342 | #endif |
|
|
343 | |
|
|
344 | dnsv4_tos = -1; |
|
|
345 | dnsv4_fd = -1; |
|
|
346 | |
|
|
347 | #if ENABLE_DNS |
|
|
348 | if (THISNODE->protocols & PROT_DNSv4) |
|
|
349 | { |
|
|
350 | dns_forwarder.set (::conf.dns_forw_host, ::conf.dns_forw_port, PROT_DNSv4); |
|
|
351 | |
|
|
352 | dnsv4_fd = setup_socket (PROT_DNSv4, PF_INET, SOCK_DGRAM, IPPROTO_UDP); |
|
|
353 | |
|
|
354 | if (dnsv4_fd < 0) |
|
|
355 | return -1; |
|
|
356 | |
|
|
357 | # if defined(SOL_IP) && defined(IP_MTU_DISCOVER) |
|
|
358 | // this I really consider a linux bug. I am neither connected |
|
|
359 | // nor do I fragment myself. Linux still sets DF and doesn't |
|
|
360 | // fragment for me sometimes. |
|
|
361 | { |
|
|
362 | int oval = IP_PMTUDISC_DONT; |
|
|
363 | setsockopt (dnsv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval); |
177 | } |
364 | } |
178 | #endif |
365 | # endif |
|
|
366 | |
|
|
367 | // standard daemon practise... |
|
|
368 | { |
|
|
369 | int oval = 1; |
|
|
370 | setsockopt (dnsv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval); |
|
|
371 | } |
|
|
372 | |
|
|
373 | sockinfo si (THISNODE->dns_hostname, |
|
|
374 | THISNODE->dns_hostname ? THISNODE->dns_port : 0, |
|
|
375 | PROT_DNSv4); |
|
|
376 | |
|
|
377 | if (bind (dnsv4_fd, si.sav4 (), si.salenv4 ())) |
|
|
378 | { |
|
|
379 | slog (L_ERR, _("can't bind dnsv4 on %s: %s, exiting."), (const char *)si, strerror (errno)); |
|
|
380 | return -1; |
|
|
381 | } |
|
|
382 | |
|
|
383 | dnsv4_ev_watcher.start (dnsv4_fd, EV_READ); |
|
|
384 | ++success; |
|
|
385 | } |
|
|
386 | #endif |
|
|
387 | |
|
|
388 | ///////////////////////////////////////////////////////////////////////////// |
|
|
389 | |
|
|
390 | if (!success) |
|
|
391 | { |
|
|
392 | slog (L_ERR, _("no protocols enabled.")); |
|
|
393 | return -1; |
|
|
394 | } |
|
|
395 | |
|
|
396 | reconnect_all (); |
|
|
397 | |
|
|
398 | ///////////////////////////////////////////////////////////////////////////// |
179 | |
399 | |
180 | tap = new tap_device (); |
400 | tap = new tap_device (); |
181 | if (!tap) //D this, of course, never catches |
401 | if (!tap) //D this, of course, never catches |
182 | { |
402 | { |
183 | slog (L_ERR, _("cannot create network interface '%s'"), conf.ifname); |
403 | slog (L_ERR, _("cannot create network interface '%s'."), conf.ifname); |
184 | exit (1); |
404 | return -1; |
185 | } |
405 | } |
186 | |
406 | |
187 | run_script (run_script_cb (this, &vpn::script_if_up), true); |
407 | fcntl (tap->fd, F_SETFD, FD_CLOEXEC); |
188 | |
408 | |
|
|
409 | run_script_cb cb; |
|
|
410 | cb.set<vpn, &vpn::script_if_init> (this); |
|
|
411 | |
|
|
412 | if (tap->if_up () && |
|
|
413 | !run_script (cb, true)) |
|
|
414 | { |
|
|
415 | slog (L_ERR, _("interface initialization command '%s' failed."), |
|
|
416 | tap->if_up ()); |
|
|
417 | return -1; |
|
|
418 | } |
|
|
419 | |
|
|
420 | cb.set<vpn, &vpn::script_if_up> (this); |
|
|
421 | if (!run_script (cb, true)) |
|
|
422 | { |
|
|
423 | slog (L_ERR, _("if-up command execution failed.")); |
|
|
424 | return -1; |
|
|
425 | } |
|
|
426 | |
189 | tap_ev_watcher.start (tap->fd, POLLIN); |
427 | tap_ev_watcher.start (tap->fd, EV_READ); |
190 | |
|
|
191 | reconnect_all (); |
|
|
192 | |
428 | |
193 | return 0; |
429 | return 0; |
194 | } |
430 | } |
195 | |
431 | |
|
|
432 | bool |
|
|
433 | vpn::send_ipv4_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
|
|
434 | { |
|
|
435 | set_tos (ipv4_fd, ipv4_tos, tos); |
|
|
436 | sendto (ipv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ()); |
|
|
437 | |
|
|
438 | return true; |
|
|
439 | } |
|
|
440 | |
|
|
441 | #if 1 //D |
|
|
442 | bool |
|
|
443 | vpn::send_ipv42_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
|
|
444 | { |
|
|
445 | set_tos (ipv42_fd, ipv42_tos, tos); |
|
|
446 | sendto (ipv42_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ()); |
|
|
447 | |
|
|
448 | return true; |
|
|
449 | } |
|
|
450 | #endif |
|
|
451 | |
|
|
452 | static u16 |
|
|
453 | ipv4_checksum (u16 *data, unsigned int len) |
|
|
454 | { |
|
|
455 | // use 32 bit accumulator and fold back carry bits at the end |
|
|
456 | u32 sum = 0; |
|
|
457 | |
|
|
458 | while (len > 1) |
|
|
459 | { |
|
|
460 | sum += *data++; |
|
|
461 | len -= 2; |
|
|
462 | } |
|
|
463 | |
|
|
464 | // odd byte left? |
|
|
465 | if (len) |
|
|
466 | sum += *(u8 *)data; |
|
|
467 | |
|
|
468 | // add back carry bits |
|
|
469 | sum = (sum >> 16) + (sum & 0xffff); // lo += hi |
|
|
470 | sum += (sum >> 16); // carry |
|
|
471 | |
|
|
472 | return ~sum; |
|
|
473 | } |
|
|
474 | |
|
|
475 | #if ENABLE_ICMP |
|
|
476 | bool |
|
|
477 | vpn::send_icmpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
|
|
478 | { |
|
|
479 | pkt->unshift_hdr (4); |
|
|
480 | |
|
|
481 | icmp_header *hdr = (icmp_header *)&((*pkt)[0]); |
|
|
482 | hdr->type = ::conf.icmp_type; |
|
|
483 | hdr->code = 255; |
|
|
484 | hdr->checksum = 0; |
|
|
485 | hdr->checksum = ipv4_checksum ((u16 *)hdr, pkt->len); |
|
|
486 | |
|
|
487 | set_tos (icmpv4_fd, icmpv4_tos, tos); |
|
|
488 | sendto (icmpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ()); |
|
|
489 | |
|
|
490 | return true; |
|
|
491 | } |
|
|
492 | #endif |
|
|
493 | |
|
|
494 | bool |
|
|
495 | vpn::send_udpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
|
|
496 | { |
|
|
497 | set_tos (udpv4_fd, udpv4_tos, tos); |
|
|
498 | sendto (udpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ()); |
|
|
499 | |
|
|
500 | return true; |
|
|
501 | } |
|
|
502 | |
196 | void |
503 | void |
197 | vpn::send_ipv4_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
504 | vpn::inject_data_packet (tap_packet *pkt, int dst) |
198 | { |
505 | { |
199 | setsockopt (ipv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos); |
506 | if (dst) |
200 | sendto (ipv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ()); |
507 | { |
201 | } |
508 | // unicast |
202 | |
509 | if (dst != THISNODE->id) |
203 | void |
510 | conns[dst - 1]->inject_data_packet (pkt); |
204 | vpn::send_udpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
511 | } |
205 | { |
512 | else |
206 | setsockopt (udpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos); |
513 | { |
207 | sendto (udpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ()); |
514 | // broadcast, this is ugly, but due to the security policy |
|
|
515 | // we have to connect to all hosts... |
|
|
516 | for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c) |
|
|
517 | if ((*c)->conf != THISNODE) |
|
|
518 | (*c)->inject_data_packet (pkt); |
|
|
519 | } |
208 | } |
520 | } |
209 | |
521 | |
210 | void |
522 | void |
211 | vpn::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi) |
523 | vpn::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi) |
212 | { |
524 | { |
213 | unsigned int src = pkt->src (); |
525 | unsigned int src = pkt->src (); |
214 | unsigned int dst = pkt->dst (); |
526 | unsigned int dst = pkt->dst (); |
215 | |
527 | |
216 | slog (L_NOISE, _("<<?/%s received possible vpn packet type %d from %d to %d, length %d"), |
528 | slog (L_NOISE, _("<<?/%s received possible vpn packet type %d from %d to %d, length %d."), |
217 | (const char *)rsi, pkt->typ (), pkt->src (), pkt->dst (), pkt->len); |
529 | (const char *)rsi, pkt->typ (), pkt->src (), pkt->dst (), pkt->len); |
218 | |
530 | |
219 | if (src == 0 || src > conns.size () |
531 | if (src == 0 || src > conns.size () |
220 | || dst > conns.size () |
532 | || dst > conns.size () |
221 | || pkt->typ () >= vpn_packet::PT_MAX) |
533 | || pkt->typ () >= vpn_packet::PT_MAX) |
222 | slog (L_WARN, _("(%s): received corrupted packet type %d (src %d, dst %d)"), |
534 | slog (L_WARN, _("(%s): received corrupted packet type %d (src %d, dst %d)."), |
223 | (const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ()); |
535 | (const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ()); |
224 | else |
536 | else |
225 | { |
537 | { |
226 | connection *c = conns[src - 1]; |
538 | connection *c = conns[src - 1]; |
227 | |
539 | |
228 | if (dst == 0 && !THISNODE->routerprio) |
540 | if (dst == 0) |
229 | slog (L_WARN, _("%s(%s): received broadcast, but we are no router"), |
541 | slog (L_WARN, _("%s(%s): received broadcast (protocol violation)."), |
230 | c->conf->nodename, (const char *)rsi); |
542 | c->conf->nodename, (const char *)rsi); |
231 | else if (dst != 0 && dst != THISNODE->id) |
543 | else if (dst != THISNODE->id) |
232 | // FORWARDING NEEDED ;) |
544 | { |
|
|
545 | if (THISNODE->routerprio) |
|
|
546 | // the tos setting gets lost here. who cares. |
|
|
547 | conns[dst - 1]->inject_vpn_packet (pkt); |
|
|
548 | else |
233 | slog (L_WARN, |
549 | slog (L_WARN, |
234 | _("received frame for node %d ('%s') from %s, but this is node %d ('%s')"), |
550 | _("%s(%s): request to forward packet to %s, but we are no router (config mismatch?)."), |
|
|
551 | c->conf->nodename, (const char *)rsi, |
235 | dst, conns[dst - 1]->conf->nodename, |
552 | conns[dst - 1]->conf->nodename); |
236 | (const char *)rsi, |
553 | } |
237 | THISNODE->id, THISNODE->nodename); |
|
|
238 | else |
554 | else |
239 | c->recv_vpn_packet (pkt, rsi); |
555 | c->recv_vpn_packet (pkt, rsi); |
240 | } |
556 | } |
241 | } |
557 | } |
242 | |
558 | |
243 | void |
559 | bool |
244 | vpn::udpv4_ev (int fd, short revents) |
560 | vpn::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
245 | { |
561 | { |
246 | if (revents & (POLLIN | POLLERR)) |
562 | switch (si.prot) |
|
|
563 | { |
|
|
564 | #if 1//D2 |
|
|
565 | case PROT_IPv42: |
|
|
566 | return send_ipv42_packet (pkt, si, tos); |
|
|
567 | #endif |
|
|
568 | |
|
|
569 | case PROT_IPv4: |
|
|
570 | return send_ipv4_packet (pkt, si, tos); |
|
|
571 | |
|
|
572 | case PROT_UDPv4: |
|
|
573 | return send_udpv4_packet (pkt, si, tos); |
|
|
574 | |
|
|
575 | #if ENABLE_TCP |
|
|
576 | case PROT_TCPv4: |
|
|
577 | return send_tcpv4_packet (pkt, si, tos); |
|
|
578 | #endif |
|
|
579 | #if ENABLE_ICMP |
|
|
580 | case PROT_ICMPv4: |
|
|
581 | return send_icmpv4_packet (pkt, si, tos); |
|
|
582 | #endif |
|
|
583 | #if ENABLE_DNS |
|
|
584 | case PROT_DNSv4: |
|
|
585 | return send_dnsv4_packet (pkt, si, tos); |
|
|
586 | #endif |
|
|
587 | default: |
|
|
588 | slog (L_CRIT, _("%s: FATAL: trying to send packet with unsupported protocol."), (const char *)si); |
|
|
589 | } |
|
|
590 | |
|
|
591 | return false; |
|
|
592 | } |
|
|
593 | |
|
|
594 | #if 1//D2 |
|
|
595 | inline void |
|
|
596 | vpn::ipv42_ev (ev::io &w, int revents) |
|
|
597 | { |
|
|
598 | if (revents & EV_READ) |
247 | { |
599 | { |
248 | vpn_packet *pkt = new vpn_packet; |
600 | vpn_packet *pkt = new vpn_packet; |
249 | struct sockaddr_in sa; |
601 | struct sockaddr_in sa; |
250 | socklen_t sa_len = sizeof (sa); |
602 | socklen_t sa_len = sizeof (sa); |
251 | int len; |
603 | int len; |
252 | |
604 | |
253 | len = recvfrom (fd, &((*pkt)[0]), MAXSIZE, 0, (sockaddr *)&sa, &sa_len); |
605 | len = recvfrom (w.fd, &((*pkt)[0]), MAXSIZE, 0, (sockaddr *)&sa, &sa_len); |
254 | |
606 | |
255 | sockinfo si(sa); |
607 | sockinfo si(sa, PROT_IPv42); |
256 | |
608 | |
257 | if (len > 0) |
609 | if (len > 0) |
258 | { |
610 | { |
259 | pkt->len = len; |
611 | pkt->len = len; |
260 | |
612 | |
|
|
613 | // raw sockets deliver the ipv4 header, but don't expect it on sends |
|
|
614 | pkt->skip_hdr (pkt->ipv4_hdr_len ()); |
|
|
615 | |
261 | recv_vpn_packet (pkt, si); |
616 | recv_vpn_packet (pkt, si); |
262 | } |
617 | } |
263 | else |
618 | else |
264 | { |
619 | { |
265 | // probably ECONNRESET or somesuch |
620 | // probably ECONNRESET or somesuch |
266 | slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno)); |
621 | slog (L_DEBUG, _("%s: %s."), (const char *)si, strerror (errno)); |
267 | } |
622 | } |
268 | |
623 | |
269 | delete pkt; |
624 | delete pkt; |
270 | } |
625 | } |
271 | else if (revents & POLLHUP) |
|
|
272 | { |
|
|
273 | // this cannot ;) happen on udp sockets |
|
|
274 | slog (L_ERR, _("FATAL: POLLHUP on udp v4 fd, terminating.")); |
|
|
275 | exit (1); |
|
|
276 | } |
|
|
277 | else |
626 | else |
278 | { |
627 | { |
279 | slog (L_ERR, |
628 | slog (L_ERR, |
280 | _("FATAL: unknown revents %08x in socket, terminating\n"), |
629 | _("FATAL: unknown revents %08x in socket, exiting.\n"), |
281 | revents); |
630 | revents); |
282 | exit (1); |
631 | exit (EXIT_FAILURE); |
283 | } |
632 | } |
284 | } |
633 | } |
|
|
634 | #endif |
285 | |
635 | |
286 | void |
636 | inline void |
287 | vpn::ipv4_ev (int fd, short revents) |
637 | vpn::ipv4_ev (ev::io &w, int revents) |
288 | { |
638 | { |
289 | if (revents & (POLLIN | POLLERR)) |
639 | if (revents & EV_READ) |
290 | { |
640 | { |
291 | vpn_packet *pkt = new vpn_packet; |
641 | vpn_packet *pkt = new vpn_packet; |
292 | struct sockaddr_in sa; |
642 | struct sockaddr_in sa; |
293 | socklen_t sa_len = sizeof (sa); |
643 | socklen_t sa_len = sizeof (sa); |
294 | int len; |
644 | int len; |
295 | |
645 | |
296 | len = recvfrom (fd, &((*pkt)[0]), MAXSIZE, 0, (sockaddr *)&sa, &sa_len); |
646 | len = recvfrom (w.fd, &((*pkt)[0]), MAXSIZE, 0, (sockaddr *)&sa, &sa_len); |
297 | |
647 | |
298 | sockinfo si(sa, PROT_IPv4); |
648 | sockinfo si(sa, PROT_IPv4); |
299 | |
649 | |
300 | if (len > 0) |
650 | if (len > 0) |
301 | { |
651 | { |
302 | pkt->len = len; |
652 | pkt->len = len; |
303 | |
653 | |
304 | // raw sockets deliver the ipv4, but don't expect it on sends |
654 | // raw sockets deliver the ipv4 header, but don't expect it on sends |
305 | // this is slow, but... |
655 | pkt->skip_hdr (pkt->ipv4_hdr_len ()); |
306 | pkt->skip_hdr (IP_OVERHEAD); |
|
|
307 | |
656 | |
308 | recv_vpn_packet (pkt, si); |
657 | recv_vpn_packet (pkt, si); |
309 | } |
658 | } |
310 | else |
659 | else |
311 | { |
660 | { |
312 | // probably ECONNRESET or somesuch |
661 | // probably ECONNRESET or somesuch |
313 | slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno)); |
662 | slog (L_DEBUG, _("%s: %s."), (const char *)si, strerror (errno)); |
314 | } |
663 | } |
315 | |
664 | |
316 | delete pkt; |
665 | delete pkt; |
317 | } |
666 | } |
318 | else if (revents & POLLHUP) |
|
|
319 | { |
|
|
320 | // this cannot ;) happen on udp sockets |
|
|
321 | slog (L_ERR, _("FATAL: POLLHUP on ipv4 fd, terminating.")); |
|
|
322 | exit (1); |
|
|
323 | } |
|
|
324 | else |
667 | else |
325 | { |
668 | { |
326 | slog (L_ERR, |
669 | slog (L_ERR, |
327 | _("FATAL: unknown revents %08x in socket, terminating\n"), |
670 | _("FATAL: unknown revents %08x in socket, exiting.\n"), |
328 | revents); |
671 | revents); |
329 | exit (1); |
672 | exit (EXIT_FAILURE); |
330 | } |
673 | } |
331 | } |
674 | } |
332 | |
675 | |
333 | #if ENABLE_TCP |
676 | #if ENABLE_ICMP |
334 | |
677 | inline void |
335 | struct tcp_info { |
678 | vpn::icmpv4_ev (ev::io &w, int revents) |
336 | int fd; |
679 | { |
337 | bool ok; |
680 | if (revents & EV_READ) |
338 | io_watcher r; |
|
|
339 | |
|
|
340 | tcp_info (vpn *v) |
|
|
341 | : r(v, &vpn::tcpv4_ev) |
|
|
342 | { |
|
|
343 | fd = -1; |
|
|
344 | } |
681 | { |
345 | |
682 | vpn_packet *pkt = new vpn_packet; |
346 | ~tcp_info () { close (fd); } |
|
|
347 | }; |
|
|
348 | |
|
|
349 | typedef map<sockinfo, tcp_info *> tcp_si_map; |
|
|
350 | typedef map<int, tcp_info *> tcp_fd_map; // unneecssary if iom would be cooler |
|
|
351 | static tcp_si_map tcp_si; |
|
|
352 | static tcp_fd_map tcp_fd; |
|
|
353 | |
|
|
354 | void |
|
|
355 | vpn::send_tcpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
|
|
356 | { |
|
|
357 | tcp_si_map::iterator info = tcp_si.find (si); |
|
|
358 | |
|
|
359 | if (info == tcp_si.end ()) |
|
|
360 | { |
|
|
361 | // woaw, the first lost packet ;) |
|
|
362 | tcp_info *i = new tcp_info (this); |
|
|
363 | |
|
|
364 | i->ok = false; |
|
|
365 | i->fd = socket (PF_INET, SOCK_STREAM, IPPROTO_TCP); |
|
|
366 | |
|
|
367 | if (i->fd >= 0) |
|
|
368 | { |
|
|
369 | fcntl (i->fd, F_SETFL, O_NONBLOCK); |
|
|
370 | |
|
|
371 | if (connect (i->fd, si.sav4 (), si.salenv4 ()) >= 0 |
|
|
372 | || errno == EINPROGRESS) |
|
|
373 | { |
|
|
374 | tcp_si.insert (tcp_si_map::value_type (si, i)); |
|
|
375 | tcp_fd.insert (tcp_fd_map::value_type (i->fd, i)); |
|
|
376 | return; |
|
|
377 | } |
|
|
378 | |
|
|
379 | delete i; |
|
|
380 | } |
|
|
381 | } |
|
|
382 | else |
|
|
383 | { |
|
|
384 | tcp_info *i = info->second; |
|
|
385 | |
|
|
386 | if (i->ok) |
|
|
387 | { |
|
|
388 | setsockopt (i->fd, SOL_IP, IP_TOS, &tos, sizeof tos); |
|
|
389 | |
|
|
390 | if (write (i->fd, (void *)pkt, pkt->len + sizeof (u32)) != pkt->len + sizeof (u32)) |
|
|
391 | { |
|
|
392 | // error, close socket, forget it and retry immediately |
|
|
393 | tcp_si.erase (info); |
|
|
394 | tcp_fd.erase (i->fd); |
|
|
395 | delete i; |
|
|
396 | |
|
|
397 | // tail recursion is... better than goto(?) |
|
|
398 | send_tcpv4_packet (pkt, si, tos); |
|
|
399 | } |
|
|
400 | } |
|
|
401 | } |
|
|
402 | |
|
|
403 | #if 0 |
|
|
404 | setsockopt (udpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos); |
|
|
405 | sendto (udpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ()); |
|
|
406 | #endif |
|
|
407 | } |
|
|
408 | |
|
|
409 | void |
|
|
410 | vpn::tcpv4_accept (int fd, short revents) |
|
|
411 | { |
|
|
412 | if (revents & (POLLIN | POLLERR)) |
|
|
413 | { |
|
|
414 | struct sockaddr_in sa; |
683 | struct sockaddr_in sa; |
415 | socklen_t sa_len = sizeof (sa); |
684 | socklen_t sa_len = sizeof (sa); |
416 | int len; |
685 | int len; |
417 | |
686 | |
418 | fd = accept (fd, (sockaddr *)&sa, &sa_len); |
687 | len = recvfrom (w.fd, &((*pkt)[0]), MAXSIZE, 0, (sockaddr *)&sa, &sa_len); |
419 | |
688 | |
420 | if (fd >= 0) |
|
|
421 | { |
|
|
422 | fcntl (fd, F_SETFL, O_NONBLOCK); |
|
|
423 | |
|
|
424 | sockinfo si(sa, PROT_TCPv4); |
689 | sockinfo si(sa, PROT_ICMPv4); |
425 | tcp_info *i = new tcp_info (this); |
|
|
426 | |
690 | |
427 | i->fd = fd; |
691 | if (len > 0) |
428 | i->ok = true; |
|
|
429 | i->r.start (fd, POLLIN); |
|
|
430 | |
|
|
431 | tcp_si.insert (tcp_si_map::value_type (si, i)); |
|
|
432 | tcp_fd.insert (tcp_fd_map::value_type (fd, i)); |
|
|
433 | } |
692 | { |
434 | } |
693 | pkt->len = len; |
435 | } |
|
|
436 | |
694 | |
437 | void |
695 | icmp_header *hdr = (icmp_header *)&((*pkt)[IP_OVERHEAD]); |
438 | vpn::tcpv4_ev (int fd, short revents) |
|
|
439 | { |
|
|
440 | if (revents & (POLLIN | POLLERR)) |
|
|
441 | { |
|
|
442 | tcp_fd_map::iterator info = tcp_fd.find (fd); |
|
|
443 | |
696 | |
444 | if (info != tcp_fd.end ()) |
697 | if (hdr->type == ::conf.icmp_type |
445 | { |
698 | && hdr->code == 255) |
446 | tcp_info *i = info->second; |
|
|
447 | |
|
|
448 | if (!i->ok) // not yet established |
|
|
449 | { |
699 | { |
450 | i->ok = true; |
700 | // raw sockets deliver the ipv4, but don't expect it on sends |
451 | fcntl (i->fd, F_SETFL, 0); |
701 | // this is slow, but... |
|
|
702 | pkt->skip_hdr (pkt->ipv4_hdr_len () + (ICMP_OVERHEAD - IP_OVERHEAD)); |
|
|
703 | |
|
|
704 | recv_vpn_packet (pkt, si); |
452 | } |
705 | } |
453 | |
|
|
454 | u32 len; |
|
|
455 | |
|
|
456 | if (sizeof (len) == read (fd, &len, sizeof (len))) |
|
|
457 | { |
|
|
458 | slog (L_ERR, "%d bytes received\n", len); |
|
|
459 | } |
706 | } |
460 | |
707 | else |
461 | //tcp_si.erase (i); |
|
|
462 | tcp_fd.erase (fd); |
|
|
463 | delete i; |
|
|
464 | } |
708 | { |
|
|
709 | // probably ECONNRESET or somesuch |
|
|
710 | slog (L_DEBUG, _("%s: %s."), (const char *)si, strerror (errno)); |
|
|
711 | } |
|
|
712 | |
|
|
713 | delete pkt; |
|
|
714 | } |
|
|
715 | else |
465 | } |
716 | { |
|
|
717 | slog (L_ERR, |
|
|
718 | _("FATAL: unknown revents %08x in socket, exiting.\n"), |
|
|
719 | revents); |
|
|
720 | exit (EXIT_FAILURE); |
|
|
721 | } |
466 | } |
722 | } |
467 | |
|
|
468 | #endif |
723 | #endif |
469 | |
724 | |
470 | void |
725 | inline void |
471 | vpn::tap_ev (int fd, short revents) |
726 | vpn::udpv4_ev (ev::io &w, int revents) |
472 | { |
727 | { |
473 | if (revents & POLLIN) |
728 | if (revents & EV_READ) |
|
|
729 | { |
|
|
730 | vpn_packet *pkt = new vpn_packet; |
|
|
731 | struct sockaddr_in sa; |
|
|
732 | socklen_t sa_len = sizeof (sa); |
|
|
733 | int len; |
|
|
734 | |
|
|
735 | len = recvfrom (w.fd, &((*pkt)[0]), MAXSIZE, 0, (sockaddr *)&sa, &sa_len); |
|
|
736 | |
|
|
737 | sockinfo si(sa, PROT_UDPv4); |
|
|
738 | |
|
|
739 | if (len > 0) |
|
|
740 | { |
|
|
741 | pkt->len = len; |
|
|
742 | |
|
|
743 | recv_vpn_packet (pkt, si); |
|
|
744 | } |
|
|
745 | else |
|
|
746 | { |
|
|
747 | // probably ECONNRESET or somesuch |
|
|
748 | slog (L_DEBUG, _("%s: fd %d, %s."), (const char *)si, w.fd, strerror (errno)); |
|
|
749 | } |
|
|
750 | |
|
|
751 | delete pkt; |
|
|
752 | } |
|
|
753 | else |
|
|
754 | { |
|
|
755 | slog (L_ERR, |
|
|
756 | _("FATAL: unknown revents %08x in socket, exiting.\n"), |
|
|
757 | revents); |
|
|
758 | exit (EXIT_FAILURE); |
|
|
759 | } |
|
|
760 | } |
|
|
761 | |
|
|
762 | inline void |
|
|
763 | vpn::tap_ev (ev::io &w, int revents) |
|
|
764 | { |
|
|
765 | if (revents & EV_READ) |
474 | { |
766 | { |
475 | /* process data */ |
767 | /* process data */ |
476 | tap_packet *pkt; |
768 | tap_packet *pkt; |
477 | |
769 | |
478 | pkt = tap->recv (); |
770 | pkt = tap->recv (); |
479 | |
771 | |
|
|
772 | if (!pkt) |
|
|
773 | return; |
|
|
774 | |
|
|
775 | if (pkt->len > 14) |
|
|
776 | { |
480 | int dst = mac2id (pkt->dst); |
777 | int dst = mac2id (pkt->dst); |
481 | int src = mac2id (pkt->src); |
778 | int src = mac2id (pkt->src); |
482 | |
779 | |
483 | if (src != THISNODE->id) |
780 | if (src != THISNODE->id) |
484 | { |
|
|
485 | slog (L_ERR, _("FATAL: tap packet not originating on current node received, terminating.")); |
|
|
486 | exit (1); |
|
|
487 | } |
|
|
488 | |
|
|
489 | if (dst == THISNODE->id) |
|
|
490 | { |
|
|
491 | slog (L_ERR, _("FATAL: tap packet destined for current node received, terminating.")); |
|
|
492 | exit (1); |
|
|
493 | } |
|
|
494 | |
|
|
495 | if (dst > conns.size ()) |
|
|
496 | slog (L_ERR, _("tap packet for unknown node %d received, ignoring."), dst); |
|
|
497 | else |
|
|
498 | { |
|
|
499 | if (dst) |
|
|
500 | { |
781 | { |
501 | // unicast |
782 | slog (L_ERR, _("FATAL: tap packet not originating on current node received (if-up script not working properly?), exiting.")); |
502 | if (dst != THISNODE->id) |
783 | exit (EXIT_FAILURE); |
503 | conns[dst - 1]->inject_data_packet (pkt); |
|
|
504 | } |
784 | } |
|
|
785 | |
|
|
786 | if (dst == THISNODE->id) |
|
|
787 | { |
|
|
788 | slog (L_ERR, _("FATAL: tap packet destined for current node received, exiting.")); |
|
|
789 | exit (EXIT_FAILURE); |
|
|
790 | } |
|
|
791 | |
|
|
792 | if (dst > conns.size ()) |
|
|
793 | slog (L_ERR, _("tap packet for unknown node %d received, ignoring."), dst); |
505 | else |
794 | else |
506 | { |
|
|
507 | // broadcast, first check router, then self, then english |
|
|
508 | connection *router = find_router (); |
|
|
509 | |
|
|
510 | if (router) |
|
|
511 | router->inject_data_packet (pkt, true); |
795 | inject_data_packet (pkt, dst); |
512 | else |
|
|
513 | for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c) |
|
|
514 | if ((*c)->conf != THISNODE) |
|
|
515 | (*c)->inject_data_packet (pkt); |
|
|
516 | } |
|
|
517 | } |
796 | } |
518 | |
797 | |
519 | delete pkt; |
798 | delete pkt; |
520 | } |
799 | } |
521 | else if (revents & (POLLHUP | POLLERR)) |
|
|
522 | { |
|
|
523 | slog (L_ERR, _("FATAL: POLLHUP or POLLERR on network device fd, terminating.")); |
|
|
524 | exit (1); |
|
|
525 | } |
|
|
526 | else |
800 | else |
527 | abort (); |
801 | abort (); |
528 | } |
802 | } |
529 | |
803 | |
530 | void |
804 | inline void |
531 | vpn::event_cb (tstamp &ts) |
805 | vpn::event_cb (ev::timer &w, int) |
532 | { |
806 | { |
533 | if (events) |
807 | if (events) |
534 | { |
808 | { |
535 | if (events & EVENT_SHUTDOWN) |
809 | if (events & EVENT_SHUTDOWN) |
536 | { |
810 | { |
537 | slog (L_INFO, _("preparing shutdown...")); |
811 | slog (L_INFO, _("preparing shutdown...")); |
538 | |
812 | |
539 | shutdown_all (); |
813 | shutdown_all (); |
540 | |
|
|
541 | remove_pid (pidfilename); |
814 | remove_pid (conf.pidfilename); |
542 | |
|
|
543 | slog (L_INFO, _("terminating")); |
815 | slog (L_INFO, _("exiting.")); |
544 | |
816 | exit (EXIT_SUCCESS); |
545 | exit (0); |
|
|
546 | } |
817 | } |
547 | |
818 | |
548 | if (events & EVENT_RECONNECT) |
819 | if (events & EVENT_RECONNECT) |
549 | { |
820 | { |
550 | slog (L_INFO, _("forced reconnect")); |
821 | slog (L_INFO, _("forced reconnect.")); |
551 | |
822 | |
552 | reconnect_all (); |
823 | reconnect_all (); |
553 | } |
824 | } |
554 | |
825 | |
555 | events = 0; |
826 | events = 0; |
556 | } |
827 | } |
557 | |
|
|
558 | ts = TSTAMP_CANCEL; |
|
|
559 | } |
828 | } |
560 | |
829 | |
561 | void |
830 | void |
562 | vpn::shutdown_all () |
831 | vpn::shutdown_all () |
563 | { |
832 | { |
… | |
… | |
573 | |
842 | |
574 | conns.clear (); |
843 | conns.clear (); |
575 | |
844 | |
576 | connection_init (); |
845 | connection_init (); |
577 | |
846 | |
578 | for (configuration::node_vector::iterator i = conf.nodes.begin (); |
847 | for (configuration::node_vector::iterator i = conf.nodes.begin (); i != conf.nodes.end (); ++i) |
579 | i != conf.nodes.end (); ++i) |
848 | conns.push_back (new connection (this, *i)); |
580 | { |
|
|
581 | connection *conn = new connection (this); |
|
|
582 | |
849 | |
583 | conn->conf = *i; |
850 | for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c) |
584 | conns.push_back (conn); |
|
|
585 | |
|
|
586 | conn->establish_connection (); |
851 | (*c)->establish_connection (); |
587 | } |
|
|
588 | } |
852 | } |
589 | |
853 | |
590 | connection *vpn::find_router () |
854 | bool |
|
|
855 | vpn::can_direct (conf_node *src, conf_node *dst) const |
591 | { |
856 | { |
592 | u32 prio = 0; |
857 | return src != dst |
|
|
858 | && src->may_direct (dst) |
|
|
859 | && dst->may_direct (src) |
|
|
860 | && (((src->protocols & dst->protocols) && src->connectmode == conf_node::C_ALWAYS) |
|
|
861 | || (src->protocols & dst->connectable_protocols ())); |
|
|
862 | } |
|
|
863 | |
|
|
864 | // only works for indirect and routed connections: find a router |
|
|
865 | // from THISNODE to dst |
|
|
866 | connection * |
|
|
867 | vpn::find_router_for (const connection *dst) |
|
|
868 | { |
593 | connection *router = 0; |
869 | connection *router = 0; |
594 | |
870 | |
|
|
871 | // first try to find a router with a direct connection, route there |
|
|
872 | // regardless of any other considerations. |
|
|
873 | { |
|
|
874 | u32 prio = 1; |
|
|
875 | |
|
|
876 | for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i) |
|
|
877 | { |
|
|
878 | connection *c = *i; |
|
|
879 | |
|
|
880 | if (c->conf->routerprio > prio |
|
|
881 | && c->conf != THISNODE |
|
|
882 | && can_direct (c->conf, dst->conf) |
|
|
883 | && c->ictx && c->octx) |
|
|
884 | { |
|
|
885 | prio = c->conf->routerprio; |
|
|
886 | router = c; |
|
|
887 | } |
|
|
888 | } |
|
|
889 | } |
|
|
890 | |
|
|
891 | if (router) |
|
|
892 | return router; |
|
|
893 | |
|
|
894 | // second try find the router with the highest priority, higher than ours |
|
|
895 | { |
|
|
896 | u32 prio = THISNODE->routerprio ? THISNODE->routerprio : 1; |
|
|
897 | |
|
|
898 | for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i) |
|
|
899 | { |
|
|
900 | connection *c = *i; |
|
|
901 | |
|
|
902 | if (c->conf->routerprio > prio |
|
|
903 | && c != dst |
|
|
904 | && c->conf != THISNODE |
|
|
905 | && c->ictx && c->octx) |
|
|
906 | { |
|
|
907 | prio = c->conf->routerprio; |
|
|
908 | router = c; |
|
|
909 | } |
|
|
910 | } |
|
|
911 | } |
|
|
912 | |
|
|
913 | return router; |
|
|
914 | } |
|
|
915 | |
|
|
916 | void |
|
|
917 | vpn::connection_established (connection *c) |
|
|
918 | { |
595 | for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i) |
919 | for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i) |
596 | { |
920 | { |
597 | connection *c = *i; |
921 | connection *o = *i; |
598 | |
922 | |
599 | if (c->conf->routerprio > prio |
923 | if (!o->is_direct |
600 | && c->connectmode == conf_node::C_ALWAYS |
924 | && o->si.valid () |
601 | && c->conf != THISNODE |
925 | && c->si != o->si |
602 | && c->ictx && c->octx) |
926 | && c == find_router_for (o)) |
603 | { |
|
|
604 | prio = c->conf->routerprio; |
|
|
605 | router = c; |
|
|
606 | } |
927 | { |
|
|
928 | slog (L_DEBUG, _("%s: can now route packets via %s, re-keying connection."), |
|
|
929 | o->conf->nodename, c->conf->nodename); |
|
|
930 | o->rekey (); |
|
|
931 | } |
607 | } |
932 | } |
608 | |
|
|
609 | return router; |
|
|
610 | } |
933 | } |
611 | |
934 | |
612 | void vpn::connect_request (int id) |
935 | void |
|
|
936 | vpn::send_connect_request (connection *c) |
613 | { |
937 | { |
614 | connection *c = find_router (); |
938 | connection *r = find_router_for (c); |
615 | |
939 | |
616 | if (c) |
940 | if (r) |
|
|
941 | { |
|
|
942 | slog (L_TRACE, _("%s: no address known, sending mediated connection request via %s."), |
|
|
943 | c->conf->nodename, r->conf->nodename); |
617 | c->connect_request (id); |
944 | r->send_connect_request (c->conf->id); |
618 | //else // does not work, because all others must connect to the same router |
945 | } |
619 | // // no router found, aggressively connect to all routers |
946 | else |
620 | // for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i) |
947 | slog (L_DEBUG, _("%s: no way to connect and no router found: unable to connect at this time."), |
621 | // if ((*i)->conf->routerprio) |
948 | c->conf->nodename); |
622 | // (*i)->establish_connection (); |
|
|
623 | } |
949 | } |
624 | |
950 | |
625 | void |
951 | void |
626 | connection::dump_status () |
952 | connection::dump_status () |
627 | { |
953 | { |
628 | slog (L_NOTICE, _("node %s (id %d)"), conf->nodename, conf->id); |
954 | slog (L_NOTICE, _("node %s (id %d)"), conf->nodename, conf->id); |
629 | slog (L_NOTICE, _(" connectmode %d (%d) / sockaddr %s / minor %d"), |
955 | slog (L_NOTICE, _(" connectmode %d (%d) / sockaddr %s / minor %d"), |
630 | connectmode, conf->connectmode, (const char *)si, (int)prot_minor); |
956 | connectmode, conf->connectmode, (const char *)si, (int)prot_minor); |
631 | slog (L_NOTICE, _(" ictx/octx %08lx/%08lx / oseqno %d / retry_cnt %d"), |
957 | slog (L_NOTICE, _(" ictx/octx %08lx/%08lx / oseqno %d / retry_cnt %d"), |
632 | (long)ictx, (long)octx, (int)oseqno, (int)retry_cnt); |
958 | (long)ictx, (long)octx, (int)oseqno, (int)retry_cnt); |
633 | slog (L_NOTICE, _(" establish_conn %ld / rekey %ld / keepalive %ld"), |
|
|
634 | (long)(establish_connection.at), (long)(rekey.at), (long)(keepalive.at)); |
|
|
635 | } |
959 | } |
636 | |
960 | |
637 | void |
961 | void |
638 | vpn::dump_status () |
962 | vpn::dump_status () |
639 | { |
963 | { |
640 | slog (L_NOTICE, _("BEGIN status dump (%ld)"), (long)NOW); |
964 | slog (L_NOTICE, _("BEGIN status dump (%ld)"), (long)ev_now ()); |
641 | |
965 | |
642 | for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c) |
966 | for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c) |
643 | (*c)->dump_status (); |
967 | (*c)->dump_status (); |
644 | |
968 | |
645 | slog (L_NOTICE, _("END status dump")); |
969 | slog (L_NOTICE, _("END status dump")); |
646 | } |
970 | } |
647 | |
971 | |
648 | vpn::vpn (void) |
972 | vpn::vpn (void) |
649 | : event(this, &vpn::event_cb) |
973 | { |
|
|
974 | event .set<vpn, &vpn::event_cb > (this); |
650 | , udpv4_ev_watcher(this, &vpn::udpv4_ev) |
975 | udpv4_ev_watcher .set<vpn, &vpn::udpv4_ev > (this); |
651 | , ipv4_ev_watcher (this, &vpn::ipv4_ev) |
976 | ipv4_ev_watcher .set<vpn, &vpn::ipv4_ev > (this); |
652 | , tap_ev_watcher (this, &vpn::tap_ev) |
977 | #if 1//D2 |
|
|
978 | ipv42_ev_watcher .set<vpn, &vpn::ipv42_ev > (this); |
|
|
979 | #endif |
653 | #if ENABLE_TCP |
980 | #if ENABLE_TCP |
654 | , tcpv4_accept_watcher(this, &vpn::tcpv4_accept) |
981 | tcpv4_ev_watcher .set<vpn, &vpn::tcpv4_ev > (this); |
655 | #endif |
982 | #endif |
656 | { |
983 | #if ENABLE_ICMP |
|
|
984 | icmpv4_ev_watcher.set<vpn, &vpn::icmpv4_ev> (this); |
|
|
985 | #endif |
|
|
986 | #if ENABLE_DNS |
|
|
987 | dnsv4_ev_watcher .set<vpn, &vpn::dnsv4_ev > (this); |
|
|
988 | #endif |
|
|
989 | tap_ev_watcher .set<vpn, &vpn::tap_ev > (this); |
657 | } |
990 | } |
658 | |
991 | |
659 | vpn::~vpn () |
992 | vpn::~vpn () |
660 | { |
993 | { |
661 | } |
994 | } |