1 | /* |
1 | /* |
2 | vpn.C -- handle the protocol, encryption, handshaking etc. |
2 | vpn.C -- handle the protocol, encryption, handshaking etc. |
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3 | Copyright (C) 2003-2005 Marc Lehmann <gvpe@schmorp.de> |
3 | |
4 | |
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5 | This file is part of GVPE. |
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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 |
5 | it under the terms of the GNU General Public License as published by |
8 | it under the terms of the GNU General Public License as published by |
6 | the Free Software Foundation; either version 2 of the License, or |
9 | the Free Software Foundation; either version 2 of the License, or |
7 | (at your option) any later version. |
10 | (at your 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, |
10 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
13 | but 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 |
12 | GNU General Public License for more details. |
15 | GNU General 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 |
15 | along with this program; if not, write to the Free Software |
18 | along with gvpe; if not, write to the Free Software |
16 | Foundation, Inc. 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
19 | Foundation, Inc. 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
17 | */ |
20 | */ |
18 | |
21 | |
19 | #include "config.h" |
22 | #include "config.h" |
20 | |
23 | |
21 | #include <list> |
24 | #include <list> |
22 | |
25 | |
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26 | #include <cstdio> |
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27 | #include <cstring> |
23 | #include <cstdlib> |
28 | #include <cstdlib> |
24 | #include <cstring> |
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25 | #include <cstdio> |
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26 | |
29 | |
27 | #include <sys/types.h> |
30 | #include <sys/types.h> |
28 | #include <sys/socket.h> |
31 | #include <sys/socket.h> |
29 | #include <sys/poll.h> |
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30 | #include <sys/wait.h> |
32 | #include <sys/wait.h> |
31 | #include <errno.h> |
33 | #include <errno.h> |
32 | #include <time.h> |
34 | #include <time.h> |
33 | #include <unistd.h> |
35 | #include <unistd.h> |
34 | #include <fcntl.h> |
36 | #include <fcntl.h> |
35 | #include <sys/socket.h> |
37 | #include <sys/socket.h> |
36 | #include <netinet/in.h> |
38 | |
37 | #include <arpa/inet.h> |
39 | #include "netcompat.h" |
38 | #include <net/if.h> |
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39 | #ifdef HAVE_NETINET_IN_SYSTM_H |
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40 | # include <netinet/in_systm.h> |
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41 | #endif |
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42 | #ifdef HAVE_NETINET_IP_H |
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43 | # include <netinet/ip.h> |
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44 | #endif |
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45 | #ifdef HAVE_NETINET_TCP_H |
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46 | # include <netinet/tcp.h> |
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47 | #endif |
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48 | #if ENABLE_ICMP |
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49 | # include <netinet/ip_icmp.h> |
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50 | #endif |
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51 | |
40 | |
52 | #include "pidfile.h" |
41 | #include "pidfile.h" |
53 | |
42 | |
54 | #include "connection.h" |
43 | #include "connection.h" |
55 | #include "util.h" |
44 | #include "util.h" |
56 | #include "vpn.h" |
45 | #include "vpn.h" |
57 | |
46 | |
58 | #if !defined(SOL_IP) && defined(IPPROTO_IP) |
47 | vpn network; // THE vpn (bad design...) |
59 | # define SOL_IP IPPROTO_IP |
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60 | #endif |
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61 | |
48 | |
62 | ///////////////////////////////////////////////////////////////////////////// |
49 | ///////////////////////////////////////////////////////////////////////////// |
63 | |
50 | |
64 | const char *vpn::script_if_up () |
51 | const char *vpn::script_if_up () |
65 | { |
52 | { |
… | |
… | |
69 | mtu += ETH_OVERHEAD - 6 - 6; // now we have the data portion |
56 | mtu += ETH_OVERHEAD - 6 - 6; // now we have the data portion |
70 | mtu -= mtu % EVP_CIPHER_block_size (CIPHER); // round |
57 | mtu -= mtu % EVP_CIPHER_block_size (CIPHER); // round |
71 | mtu -= ETH_OVERHEAD - 6 - 6; // and get interface mtu again |
58 | mtu -= ETH_OVERHEAD - 6 - 6; // and get interface mtu again |
72 | |
59 | |
73 | char *env; |
60 | char *env; |
74 | asprintf (&env, "CONFBASE=%s", confbase); |
61 | asprintf (&env, "CONFBASE=%s", confbase); putenv (env); |
75 | putenv (env); |
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76 | asprintf (&env, "NODENAME=%s", THISNODE->nodename); |
62 | asprintf (&env, "NODENAME=%s", THISNODE->nodename); putenv (env); |
77 | putenv (env); |
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78 | asprintf (&env, "NODEID=%d", THISNODE->id); |
63 | asprintf (&env, "NODEID=%d", THISNODE->id); putenv (env); |
79 | putenv (env); |
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80 | asprintf (&env, "IFNAME=%s", tap->interface ()); |
64 | asprintf (&env, "IFNAME=%s", tap->interface ()); putenv (env); |
81 | putenv (env); |
65 | asprintf (&env, "IFTYPE=%s", IFTYPE); putenv (env); |
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66 | asprintf (&env, "IFSUBTYPE=%s", IFSUBTYPE); putenv (env); |
82 | asprintf (&env, "MTU=%d", mtu); |
67 | asprintf (&env, "MTU=%d", mtu); putenv (env); |
83 | putenv (env); |
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84 | asprintf (&env, "MAC=%02x:%02x:%02x:%02x:%02x:%02x", |
68 | asprintf (&env, "MAC=%02x:%02x:%02x:%02x:%02x:%02x", |
85 | 0xfe, 0xfd, 0x80, 0x00, THISNODE->id >> 8, |
69 | 0xfe, 0xfd, 0x80, 0x00, THISNODE->id >> 8, |
86 | THISNODE->id & 0xff); |
70 | THISNODE->id & 0xff); |
87 | putenv (env); |
71 | putenv (env); |
88 | |
72 | |
… | |
… | |
116 | sockinfo si (THISNODE, PROT_IPv4); |
100 | sockinfo si (THISNODE, PROT_IPv4); |
117 | |
101 | |
118 | if (bind (ipv4_fd, si.sav4 (), si.salenv4 ())) |
102 | if (bind (ipv4_fd, si.sav4 (), si.salenv4 ())) |
119 | { |
103 | { |
120 | slog (L_ERR, _("can't bind ipv4 socket on %s: %s"), (const char *)si, strerror (errno)); |
104 | slog (L_ERR, _("can't bind ipv4 socket on %s: %s"), (const char *)si, strerror (errno)); |
121 | exit (1); |
105 | exit (EXIT_FAILURE); |
122 | } |
106 | } |
123 | |
107 | |
124 | ipv4_ev_watcher.start (ipv4_fd, POLLIN); |
108 | ipv4_ev_watcher.start (ipv4_fd, EVENT_READ); |
125 | } |
109 | } |
126 | |
110 | |
127 | udpv4_fd = -1; |
111 | udpv4_fd = -1; |
128 | |
112 | |
129 | if (THISNODE->protocols & PROT_UDPv4 && THISNODE->udp_port) |
113 | if (THISNODE->protocols & PROT_UDPv4 && THISNODE->udp_port) |
… | |
… | |
154 | sockinfo si (THISNODE, PROT_UDPv4); |
138 | sockinfo si (THISNODE, PROT_UDPv4); |
155 | |
139 | |
156 | if (bind (udpv4_fd, si.sav4 (), si.salenv4 ())) |
140 | if (bind (udpv4_fd, si.sav4 (), si.salenv4 ())) |
157 | { |
141 | { |
158 | slog (L_ERR, _("can't bind udpv4 on %s: %s"), (const char *)si, strerror (errno)); |
142 | slog (L_ERR, _("can't bind udpv4 on %s: %s"), (const char *)si, strerror (errno)); |
159 | exit (1); |
143 | exit (EXIT_FAILURE); |
160 | } |
144 | } |
161 | |
145 | |
162 | udpv4_ev_watcher.start (udpv4_fd, POLLIN); |
146 | udpv4_ev_watcher.start (udpv4_fd, EVENT_READ); |
163 | } |
147 | } |
164 | |
148 | |
165 | icmpv4_fd = -1; |
149 | icmpv4_fd = -1; |
166 | |
150 | |
167 | #if ENABLE_ICMP |
151 | #if ENABLE_ICMP |
… | |
… | |
198 | sockinfo si (THISNODE, PROT_ICMPv4); |
182 | sockinfo si (THISNODE, PROT_ICMPv4); |
199 | |
183 | |
200 | if (bind (icmpv4_fd, si.sav4 (), si.salenv4 ())) |
184 | if (bind (icmpv4_fd, si.sav4 (), si.salenv4 ())) |
201 | { |
185 | { |
202 | slog (L_ERR, _("can't bind icmpv4 on %s: %s"), (const char *)si, strerror (errno)); |
186 | slog (L_ERR, _("can't bind icmpv4 on %s: %s"), (const char *)si, strerror (errno)); |
203 | exit (1); |
187 | exit (EXIT_FAILURE); |
204 | } |
188 | } |
205 | |
189 | |
206 | icmpv4_ev_watcher.start (icmpv4_fd, POLLIN); |
190 | icmpv4_ev_watcher.start (icmpv4_fd, EVENT_READ); |
207 | } |
191 | } |
208 | #endif |
192 | #endif |
209 | |
193 | |
210 | tcpv4_fd = -1; |
194 | tcpv4_fd = -1; |
211 | |
195 | |
… | |
… | |
228 | sockinfo si (THISNODE, PROT_TCPv4); |
212 | sockinfo si (THISNODE, PROT_TCPv4); |
229 | |
213 | |
230 | if (bind (tcpv4_fd, si.sav4 (), si.salenv4 ())) |
214 | if (bind (tcpv4_fd, si.sav4 (), si.salenv4 ())) |
231 | { |
215 | { |
232 | slog (L_ERR, _("can't bind tcpv4 on %s: %s"), (const char *)si, strerror (errno)); |
216 | slog (L_ERR, _("can't bind tcpv4 on %s: %s"), (const char *)si, strerror (errno)); |
233 | exit (1); |
217 | exit (EXIT_FAILURE); |
234 | } |
218 | } |
235 | |
219 | |
236 | if (listen (tcpv4_fd, 5)) |
220 | if (listen (tcpv4_fd, 5)) |
237 | { |
221 | { |
238 | slog (L_ERR, _("can't listen tcpv4 on %s: %s"), (const char *)si, strerror (errno)); |
222 | slog (L_ERR, _("can't listen tcpv4 on %s: %s"), (const char *)si, strerror (errno)); |
239 | exit (1); |
223 | exit (EXIT_FAILURE); |
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224 | } |
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225 | |
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226 | tcpv4_ev_watcher.start (tcpv4_fd, EVENT_READ); |
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227 | } |
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228 | #endif |
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229 | |
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230 | #if ENABLE_DNS |
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231 | if (THISNODE->protocols & PROT_DNSv4) |
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232 | { |
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233 | dns_forwarder.set (::conf.dns_forw_host, ::conf.dns_forw_port, PROT_DNSv4); |
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234 | |
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235 | dnsv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP); |
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236 | |
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237 | if (dnsv4_fd < 0) |
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238 | return -1; |
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239 | |
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240 | #if defined(SOL_IP) && defined(IP_MTU_DISCOVER) |
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241 | // this I really consider a linux bug. I am neither connected |
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242 | // nor do I fragment myself. Linux still sets DF and doesn't |
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243 | // fragment for me sometimes. |
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244 | { |
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245 | int oval = IP_PMTUDISC_DONT; |
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246 | setsockopt (udpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval); |
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247 | } |
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248 | #endif |
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249 | |
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250 | // standard daemon practise... |
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251 | { |
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252 | int oval = 1; |
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253 | setsockopt (dnsv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval); |
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254 | } |
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255 | |
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256 | sockinfo si (THISNODE->dns_hostname, |
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257 | THISNODE->dns_hostname ? THISNODE->dns_port : 0, |
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258 | PROT_DNSv4); |
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259 | |
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260 | if (bind (dnsv4_fd, si.sav4 (), si.salenv4 ())) |
240 | } |
261 | { |
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262 | slog (L_ERR, _("can't bind dnsv4 on %s: %s"), (const char *)si, strerror (errno)); |
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263 | exit (EXIT_FAILURE); |
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264 | } |
241 | |
265 | |
242 | tcpv4_ev_watcher.start (tcpv4_fd, POLLIN); |
266 | dnsv4_ev_watcher.start (dnsv4_fd, EVENT_READ); |
243 | } |
267 | } |
244 | #endif |
268 | #endif |
245 | |
269 | |
246 | tap = new tap_device (); |
270 | tap = new tap_device (); |
247 | if (!tap) //D this, of course, never catches |
271 | if (!tap) //D this, of course, never catches |
248 | { |
272 | { |
249 | slog (L_ERR, _("cannot create network interface '%s'"), conf.ifname); |
273 | slog (L_ERR, _("cannot create network interface '%s'"), conf.ifname); |
250 | exit (1); |
274 | exit (EXIT_FAILURE); |
251 | } |
275 | } |
252 | |
276 | |
253 | run_script (run_script_cb (this, &vpn::script_if_up), true); |
277 | run_script (run_script_cb (this, &vpn::script_if_up), true); |
254 | |
278 | |
255 | tap_ev_watcher.start (tap->fd, POLLIN); |
279 | tap_ev_watcher.start (tap->fd, EVENT_READ); |
256 | |
280 | |
257 | reconnect_all (); |
281 | reconnect_all (); |
258 | |
282 | |
259 | return 0; |
283 | return 0; |
260 | } |
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261 | |
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262 | // send a vpn packet out to other hosts |
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263 | bool |
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264 | vpn::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
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265 | { |
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266 | switch (si.prot) |
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267 | { |
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268 | case PROT_IPv4: |
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269 | return send_ipv4_packet (pkt, si, tos); |
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270 | |
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271 | case PROT_UDPv4: |
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272 | return send_udpv4_packet (pkt, si, tos); |
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273 | |
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274 | #if ENABLE_TCP |
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275 | case PROT_TCPv4: |
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276 | return send_tcpv4_packet (pkt, si, tos); |
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277 | #endif |
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278 | |
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279 | #if ENABLE_ICMP |
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280 | case PROT_ICMPv4: |
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281 | return send_icmpv4_packet (pkt, si, tos); |
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282 | #endif |
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283 | |
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284 | default: |
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285 | slog (L_CRIT, _("%s: FATAL: trying to send packet with unsupported protocol"), (const char *)si); |
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286 | return false; |
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287 | } |
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288 | } |
284 | } |
289 | |
285 | |
290 | bool |
286 | bool |
291 | vpn::send_ipv4_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
287 | vpn::send_ipv4_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
292 | { |
288 | { |
… | |
… | |
320 | |
316 | |
321 | return ~sum; |
317 | return ~sum; |
322 | } |
318 | } |
323 | |
319 | |
324 | #if ENABLE_ICMP |
320 | #if ENABLE_ICMP |
325 | struct icmp_header { |
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326 | u8 type; |
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327 | u8 code; |
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328 | u16 checksum; |
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329 | union { |
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330 | struct { |
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331 | u16 id; |
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332 | u16 sequence; |
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333 | } echo; |
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334 | u32 gateway; |
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335 | struct { |
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336 | u16 unused; |
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337 | u16 mtu; |
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338 | } frag; |
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339 | } un; |
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340 | }; |
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341 | |
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342 | bool |
321 | bool |
343 | vpn::send_icmpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
322 | vpn::send_icmpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
344 | { |
323 | { |
345 | #if defined(SOL_IP) && defined(IP_TOS) |
324 | #if defined(SOL_IP) && defined(IP_TOS) |
346 | setsockopt (icmpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos); |
325 | setsockopt (icmpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos); |
… | |
… | |
367 | setsockopt (udpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos); |
346 | setsockopt (udpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos); |
368 | #endif |
347 | #endif |
369 | sendto (udpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ()); |
348 | sendto (udpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ()); |
370 | |
349 | |
371 | return true; |
350 | return true; |
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351 | } |
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352 | |
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353 | void |
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354 | vpn::inject_data_packet (tap_packet *pkt, int dst) |
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355 | { |
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356 | if (dst) |
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357 | { |
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358 | // unicast |
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359 | if (dst != THISNODE->id) |
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360 | conns[dst - 1]->inject_data_packet (pkt); |
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361 | } |
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362 | else |
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363 | { |
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364 | // broadcast, this is ugly, but due to the security policy |
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365 | // we have to connect to all hosts... |
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366 | for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c) |
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367 | if ((*c)->conf != THISNODE) |
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368 | (*c)->inject_data_packet (pkt, true); |
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369 | } |
372 | } |
370 | } |
373 | |
371 | |
374 | void |
372 | void |
375 | vpn::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi) |
373 | vpn::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi) |
376 | { |
374 | { |
… | |
… | |
393 | connection *c = conns[src - 1]; |
391 | connection *c = conns[src - 1]; |
394 | |
392 | |
395 | if (dst == 0) |
393 | if (dst == 0) |
396 | slog (L_WARN, _("%s(%s): received broadcast (protocol violation)"), |
394 | slog (L_WARN, _("%s(%s): received broadcast (protocol violation)"), |
397 | c->conf->nodename, (const char *)rsi); |
395 | c->conf->nodename, (const char *)rsi); |
398 | else if (dst != 0 && dst != THISNODE->id) |
396 | else if (dst != THISNODE->id) |
399 | { |
397 | { |
400 | if (THISNODE->routerprio) |
398 | if (THISNODE->routerprio) |
401 | // the tos setting gets lost here. who cares. |
399 | // the tos setting gets lost here. who cares. |
402 | conns[dst - 1]->inject_vpn_packet (pkt); |
400 | conns[dst - 1]->inject_vpn_packet (pkt); |
403 | else |
401 | else |
… | |
… | |
409 | else |
407 | else |
410 | c->recv_vpn_packet (pkt, rsi); |
408 | c->recv_vpn_packet (pkt, rsi); |
411 | } |
409 | } |
412 | } |
410 | } |
413 | |
411 | |
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412 | bool |
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413 | vpn::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
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414 | { |
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415 | switch (si.prot) |
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416 | { |
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417 | case PROT_IPv4: |
|
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418 | return send_ipv4_packet (pkt, si, tos); |
|
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419 | case PROT_UDPv4: |
|
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420 | return send_udpv4_packet (pkt, si, tos); |
|
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421 | #if ENABLE_TCP |
|
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422 | case PROT_TCPv4: |
|
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423 | return send_tcpv4_packet (pkt, si, tos); |
|
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424 | #endif |
|
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425 | #if ENABLE_ICMP |
|
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426 | case PROT_ICMPv4: |
|
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427 | return send_icmpv4_packet (pkt, si, tos); |
|
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428 | #endif |
|
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429 | #if ENABLE_DNS |
|
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430 | case PROT_DNSv4: |
|
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431 | return send_dnsv4_packet (pkt, si, tos); |
|
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432 | #endif |
|
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433 | |
|
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434 | default: |
|
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435 | slog (L_CRIT, _("%s: FATAL: trying to send packet with unsupported protocol"), (const char *)si); |
|
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436 | } |
|
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437 | |
|
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438 | return false; |
|
|
439 | } |
|
|
440 | |
414 | void |
441 | void |
415 | vpn::ipv4_ev (io_watcher &w, short revents) |
442 | vpn::ipv4_ev (io_watcher &w, short revents) |
416 | { |
443 | { |
417 | if (revents & (POLLIN | POLLERR)) |
444 | if (revents & EVENT_READ) |
418 | { |
445 | { |
419 | vpn_packet *pkt = new vpn_packet; |
446 | vpn_packet *pkt = new vpn_packet; |
420 | struct sockaddr_in sa; |
447 | struct sockaddr_in sa; |
421 | socklen_t sa_len = sizeof (sa); |
448 | socklen_t sa_len = sizeof (sa); |
422 | int len; |
449 | int len; |
… | |
… | |
427 | |
454 | |
428 | if (len > 0) |
455 | if (len > 0) |
429 | { |
456 | { |
430 | pkt->len = len; |
457 | pkt->len = len; |
431 | |
458 | |
432 | // raw sockets deliver the ipv4, but don't expect it on sends |
459 | // raw sockets deliver the ipv4 header, but don't expect it on sends |
433 | // this is slow, but... |
|
|
434 | pkt->skip_hdr (IP_OVERHEAD); |
460 | pkt->skip_hdr (IP_OVERHEAD); |
435 | |
461 | |
436 | recv_vpn_packet (pkt, si); |
462 | recv_vpn_packet (pkt, si); |
437 | } |
463 | } |
438 | else |
464 | else |
… | |
… | |
441 | slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno)); |
467 | slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno)); |
442 | } |
468 | } |
443 | |
469 | |
444 | delete pkt; |
470 | delete pkt; |
445 | } |
471 | } |
446 | else if (revents & POLLHUP) |
|
|
447 | { |
|
|
448 | // this cannot ;) happen on udp sockets |
|
|
449 | slog (L_ERR, _("FATAL: POLLHUP on ipv4 fd, terminating.")); |
|
|
450 | exit (1); |
|
|
451 | } |
|
|
452 | else |
472 | else |
453 | { |
473 | { |
454 | slog (L_ERR, |
474 | slog (L_ERR, |
455 | _("FATAL: unknown revents %08x in socket, terminating\n"), |
475 | _("FATAL: unknown revents %08x in socket, terminating\n"), |
456 | revents); |
476 | revents); |
457 | exit (1); |
477 | exit (EXIT_FAILURE); |
458 | } |
478 | } |
459 | } |
479 | } |
460 | |
480 | |
461 | #if ENABLE_ICMP |
481 | #if ENABLE_ICMP |
462 | void |
482 | void |
463 | vpn::icmpv4_ev (io_watcher &w, short revents) |
483 | vpn::icmpv4_ev (io_watcher &w, short revents) |
464 | { |
484 | { |
465 | if (revents & (POLLIN | POLLERR)) |
485 | if (revents & EVENT_READ) |
466 | { |
486 | { |
467 | vpn_packet *pkt = new vpn_packet; |
487 | vpn_packet *pkt = new vpn_packet; |
468 | struct sockaddr_in sa; |
488 | struct sockaddr_in sa; |
469 | socklen_t sa_len = sizeof (sa); |
489 | socklen_t sa_len = sizeof (sa); |
470 | int len; |
490 | int len; |
… | |
… | |
495 | slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno)); |
515 | slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno)); |
496 | } |
516 | } |
497 | |
517 | |
498 | delete pkt; |
518 | delete pkt; |
499 | } |
519 | } |
500 | else if (revents & POLLHUP) |
|
|
501 | { |
|
|
502 | // this cannot ;) happen on udp sockets |
|
|
503 | slog (L_ERR, _("FATAL: POLLHUP on icmpv4 fd, terminating.")); |
|
|
504 | exit (1); |
|
|
505 | } |
|
|
506 | else |
520 | else |
507 | { |
521 | { |
508 | slog (L_ERR, |
522 | slog (L_ERR, |
509 | _("FATAL: unknown revents %08x in socket, terminating\n"), |
523 | _("FATAL: unknown revents %08x in socket, terminating\n"), |
510 | revents); |
524 | revents); |
511 | exit (1); |
525 | exit (EXIT_FAILURE); |
512 | } |
526 | } |
513 | } |
527 | } |
514 | #endif |
528 | #endif |
515 | |
529 | |
516 | void |
530 | void |
517 | vpn::udpv4_ev (io_watcher &w, short revents) |
531 | vpn::udpv4_ev (io_watcher &w, short revents) |
518 | { |
532 | { |
519 | if (revents & (POLLIN | POLLERR)) |
533 | if (revents & EVENT_READ) |
520 | { |
534 | { |
521 | vpn_packet *pkt = new vpn_packet; |
535 | vpn_packet *pkt = new vpn_packet; |
522 | struct sockaddr_in sa; |
536 | struct sockaddr_in sa; |
523 | socklen_t sa_len = sizeof (sa); |
537 | socklen_t sa_len = sizeof (sa); |
524 | int len; |
538 | int len; |
… | |
… | |
539 | slog (L_DEBUG, _("%s: fd %d, %s"), (const char *)si, w.fd, strerror (errno)); |
553 | slog (L_DEBUG, _("%s: fd %d, %s"), (const char *)si, w.fd, strerror (errno)); |
540 | } |
554 | } |
541 | |
555 | |
542 | delete pkt; |
556 | delete pkt; |
543 | } |
557 | } |
544 | else if (revents & POLLHUP) |
|
|
545 | { |
|
|
546 | // this cannot ;) happen on udp sockets |
|
|
547 | slog (L_ERR, _("FATAL: POLLHUP on udp v4 fd, terminating.")); |
|
|
548 | exit (1); |
|
|
549 | } |
|
|
550 | else |
558 | else |
551 | { |
559 | { |
552 | slog (L_ERR, |
560 | slog (L_ERR, |
553 | _("FATAL: unknown revents %08x in socket, terminating\n"), |
561 | _("FATAL: unknown revents %08x in socket, terminating\n"), |
554 | revents); |
562 | revents); |
555 | exit (1); |
563 | exit (EXIT_FAILURE); |
556 | } |
564 | } |
557 | } |
565 | } |
558 | |
566 | |
559 | void |
567 | void |
560 | vpn::tap_ev (io_watcher &w, short revents) |
568 | vpn::tap_ev (io_watcher &w, short revents) |
561 | { |
569 | { |
562 | if (revents & POLLIN) |
570 | if (revents & EVENT_READ) |
563 | { |
571 | { |
564 | /* process data */ |
572 | /* process data */ |
565 | tap_packet *pkt; |
573 | tap_packet *pkt; |
566 | |
574 | |
567 | pkt = tap->recv (); |
575 | pkt = tap->recv (); |
568 | |
576 | |
|
|
577 | if (!pkt) |
|
|
578 | return; |
|
|
579 | |
|
|
580 | if (pkt->len > 14) |
|
|
581 | { |
569 | int dst = mac2id (pkt->dst); |
582 | int dst = mac2id (pkt->dst); |
570 | int src = mac2id (pkt->src); |
583 | int src = mac2id (pkt->src); |
571 | |
584 | |
572 | if (src != THISNODE->id) |
585 | if (src != THISNODE->id) |
573 | { |
|
|
574 | slog (L_ERR, _("FATAL: tap packet not originating on current node received, exiting.")); |
|
|
575 | exit (1); |
|
|
576 | } |
|
|
577 | |
|
|
578 | if (dst == THISNODE->id) |
|
|
579 | { |
|
|
580 | slog (L_ERR, _("FATAL: tap packet destined for current node received, exiting.")); |
|
|
581 | exit (1); |
|
|
582 | } |
|
|
583 | |
|
|
584 | if (dst > conns.size ()) |
|
|
585 | slog (L_ERR, _("tap packet for unknown node %d received, ignoring."), dst); |
|
|
586 | else |
|
|
587 | { |
|
|
588 | if (dst) |
|
|
589 | { |
586 | { |
590 | // unicast |
587 | slog (L_ERR, _("FATAL: tap packet not originating on current node received (if-up script not working properly?), exiting.")); |
591 | if (dst != THISNODE->id) |
588 | exit (EXIT_FAILURE); |
592 | conns[dst - 1]->inject_data_packet (pkt); |
|
|
593 | } |
589 | } |
|
|
590 | |
|
|
591 | if (dst == THISNODE->id) |
|
|
592 | { |
|
|
593 | slog (L_ERR, _("FATAL: tap packet destined for current node received, exiting.")); |
|
|
594 | exit (EXIT_FAILURE); |
|
|
595 | } |
|
|
596 | |
|
|
597 | if (dst > conns.size ()) |
|
|
598 | slog (L_ERR, _("tap packet for unknown node %d received, ignoring."), dst); |
594 | else |
599 | else |
595 | { |
|
|
596 | // broadcast, this is ugly, but due to the security policy |
|
|
597 | // we have to connect to all hosts... |
|
|
598 | for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c) |
|
|
599 | if ((*c)->conf != THISNODE) |
|
|
600 | (*c)->inject_data_packet (pkt); |
600 | inject_data_packet (pkt, dst); |
601 | } |
|
|
602 | } |
601 | } |
603 | |
602 | |
604 | delete pkt; |
603 | delete pkt; |
605 | } |
|
|
606 | else if (revents & (POLLHUP | POLLERR)) |
|
|
607 | { |
|
|
608 | slog (L_ERR, _("FATAL: POLLHUP or POLLERR on network device fd, terminating.")); |
|
|
609 | exit (1); |
|
|
610 | } |
604 | } |
611 | else |
605 | else |
612 | abort (); |
606 | abort (); |
613 | } |
607 | } |
614 | |
608 | |
… | |
… | |
620 | if (events & EVENT_SHUTDOWN) |
614 | if (events & EVENT_SHUTDOWN) |
621 | { |
615 | { |
622 | slog (L_INFO, _("preparing shutdown...")); |
616 | slog (L_INFO, _("preparing shutdown...")); |
623 | |
617 | |
624 | shutdown_all (); |
618 | shutdown_all (); |
625 | |
|
|
626 | remove_pid (pidfilename); |
619 | remove_pid (conf.pidfilename); |
627 | |
|
|
628 | slog (L_INFO, _("terminating")); |
620 | slog (L_INFO, _("terminating")); |
629 | |
621 | exit (EXIT_SUCCESS); |
630 | exit (0); |
|
|
631 | } |
622 | } |
632 | |
623 | |
633 | if (events & EVENT_RECONNECT) |
624 | if (events & EVENT_RECONNECT) |
634 | { |
625 | { |
635 | slog (L_INFO, _("forced reconnect")); |
626 | slog (L_INFO, _("forced reconnect")); |
… | |
… | |
637 | reconnect_all (); |
628 | reconnect_all (); |
638 | } |
629 | } |
639 | |
630 | |
640 | events = 0; |
631 | events = 0; |
641 | } |
632 | } |
642 | |
|
|
643 | w.at = TSTAMP_CANCEL; |
|
|
644 | } |
633 | } |
645 | |
634 | |
646 | void |
635 | void |
647 | vpn::shutdown_all () |
636 | vpn::shutdown_all () |
648 | { |
637 | { |
… | |
… | |
661 | connection_init (); |
650 | connection_init (); |
662 | |
651 | |
663 | for (configuration::node_vector::iterator i = conf.nodes.begin (); |
652 | for (configuration::node_vector::iterator i = conf.nodes.begin (); |
664 | i != conf.nodes.end (); ++i) |
653 | i != conf.nodes.end (); ++i) |
665 | { |
654 | { |
666 | connection *conn = new connection (this); |
655 | connection *conn = new connection (this, *i); |
667 | |
|
|
668 | conn->conf = *i; |
|
|
669 | conns.push_back (conn); |
656 | conns.push_back (conn); |
670 | |
|
|
671 | conn->establish_connection (); |
657 | conn->establish_connection (); |
672 | } |
658 | } |
673 | } |
659 | } |
674 | |
660 | |
675 | connection *vpn::find_router () |
661 | connection *vpn::find_router () |
… | |
… | |
738 | , tcpv4_ev_watcher (this, &vpn::tcpv4_ev) |
724 | , tcpv4_ev_watcher (this, &vpn::tcpv4_ev) |
739 | #endif |
725 | #endif |
740 | #if ENABLE_ICMP |
726 | #if ENABLE_ICMP |
741 | , icmpv4_ev_watcher(this, &vpn::icmpv4_ev) |
727 | , icmpv4_ev_watcher(this, &vpn::icmpv4_ev) |
742 | #endif |
728 | #endif |
|
|
729 | #if ENABLE_DNS |
|
|
730 | , dnsv4_ev_watcher (this, &vpn::dnsv4_ev) |
|
|
731 | #endif |
743 | , tap_ev_watcher (this, &vpn::tap_ev) |
732 | , tap_ev_watcher (this, &vpn::tap_ev) |
744 | { |
733 | { |
745 | } |
734 | } |
746 | |
735 | |
747 | vpn::~vpn () |
736 | vpn::~vpn () |