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 <arpa/inet.h> |
37 | #include <sys/socket.h> |
36 | #include <netinet/in.h> |
38 | |
37 | #include <netinet/ip_icmp.h> |
39 | #include "netcompat.h" |
38 | |
40 | |
39 | #include "pidfile.h" |
41 | #include "pidfile.h" |
40 | |
42 | |
41 | #include "connection.h" |
43 | #include "connection.h" |
42 | #include "util.h" |
44 | #include "util.h" |
43 | #include "vpn.h" |
45 | #include "vpn.h" |
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46 | |
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47 | vpn network; // THE vpn (bad design...) |
44 | |
48 | |
45 | ///////////////////////////////////////////////////////////////////////////// |
49 | ///////////////////////////////////////////////////////////////////////////// |
46 | |
50 | |
47 | const char *vpn::script_if_up () |
51 | const char *vpn::script_if_up () |
48 | { |
52 | { |
… | |
… | |
52 | mtu += ETH_OVERHEAD - 6 - 6; // now we have the data portion |
56 | mtu += ETH_OVERHEAD - 6 - 6; // now we have the data portion |
53 | mtu -= mtu % EVP_CIPHER_block_size (CIPHER); // round |
57 | mtu -= mtu % EVP_CIPHER_block_size (CIPHER); // round |
54 | mtu -= ETH_OVERHEAD - 6 - 6; // and get interface mtu again |
58 | mtu -= ETH_OVERHEAD - 6 - 6; // and get interface mtu again |
55 | |
59 | |
56 | char *env; |
60 | char *env; |
57 | asprintf (&env, "CONFBASE=%s", confbase); |
61 | asprintf (&env, "CONFBASE=%s", confbase); putenv (env); |
58 | putenv (env); |
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|
59 | asprintf (&env, "NODENAME=%s", THISNODE->nodename); |
62 | asprintf (&env, "NODENAME=%s", THISNODE->nodename); putenv (env); |
60 | putenv (env); |
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|
61 | asprintf (&env, "NODEID=%d", THISNODE->id); |
63 | asprintf (&env, "NODEID=%d", THISNODE->id); putenv (env); |
62 | putenv (env); |
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|
63 | asprintf (&env, "IFNAME=%s", tap->interface ()); |
64 | asprintf (&env, "IFNAME=%s", tap->interface ()); putenv (env); |
64 | putenv (env); |
65 | asprintf (&env, "IFTYPE=%s", IFTYPE); putenv (env); |
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|
66 | asprintf (&env, "IFSUBTYPE=%s", IFSUBTYPE); putenv (env); |
65 | asprintf (&env, "MTU=%d", mtu); |
67 | asprintf (&env, "MTU=%d", mtu); putenv (env); |
66 | putenv (env); |
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|
67 | asprintf (&env, "MAC=%02x:%02x:%02x:%02x:%02x:%02x", |
68 | asprintf (&env, "MAC=%02x:%02x:%02x:%02x:%02x:%02x", |
68 | 0xfe, 0xfd, 0x80, 0x00, THISNODE->id >> 8, |
69 | 0xfe, 0xfd, 0x80, 0x00, THISNODE->id >> 8, |
69 | THISNODE->id & 0xff); |
70 | THISNODE->id & 0xff); |
70 | putenv (env); |
71 | putenv (env); |
71 | |
72 | |
… | |
… | |
84 | if (ipv4_fd < 0) |
85 | if (ipv4_fd < 0) |
85 | return -1; |
86 | return -1; |
86 | |
87 | |
87 | fcntl (ipv4_fd, F_SETFL, O_NONBLOCK); |
88 | fcntl (ipv4_fd, F_SETFL, O_NONBLOCK); |
88 | |
89 | |
89 | #ifdef IP_MTU_DISCOVER |
90 | #if defined(SOL_IP) && defined(IP_MTU_DISCOVER) |
90 | // this I really consider a linux bug. I am neither connected |
91 | // this I really consider a linux bug. I am neither connected |
91 | // nor do I fragment myself. Linux still sets DF and doesn't |
92 | // nor do I fragment myself. Linux still sets DF and doesn't |
92 | // fragment for me sometimes. |
93 | // fragment for me sometimes. |
93 | { |
94 | { |
94 | int oval = IP_PMTUDISC_DONT; |
95 | int oval = IP_PMTUDISC_DONT; |
… | |
… | |
99 | sockinfo si (THISNODE, PROT_IPv4); |
100 | sockinfo si (THISNODE, PROT_IPv4); |
100 | |
101 | |
101 | if (bind (ipv4_fd, si.sav4 (), si.salenv4 ())) |
102 | if (bind (ipv4_fd, si.sav4 (), si.salenv4 ())) |
102 | { |
103 | { |
103 | 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)); |
104 | exit (1); |
105 | exit (EXIT_FAILURE); |
105 | } |
106 | } |
106 | |
107 | |
107 | ipv4_ev_watcher.start (ipv4_fd, POLLIN); |
108 | ipv4_ev_watcher.start (ipv4_fd, EVENT_READ); |
108 | } |
109 | } |
109 | |
110 | |
110 | udpv4_fd = -1; |
111 | udpv4_fd = -1; |
111 | |
112 | |
112 | if (THISNODE->protocols & PROT_UDPv4 && THISNODE->udp_port) |
113 | if (THISNODE->protocols & PROT_UDPv4 && THISNODE->udp_port) |
… | |
… | |
122 | { |
123 | { |
123 | int oval = 1; |
124 | int oval = 1; |
124 | setsockopt (udpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval); |
125 | setsockopt (udpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval); |
125 | } |
126 | } |
126 | |
127 | |
127 | #ifdef IP_MTU_DISCOVER |
128 | #if defined(SOL_IP) && defined(IP_MTU_DISCOVER) |
128 | // this I really consider a linux bug. I am neither connected |
129 | // this I really consider a linux bug. I am neither connected |
129 | // nor do I fragment myself. Linux still sets DF and doesn't |
130 | // nor do I fragment myself. Linux still sets DF and doesn't |
130 | // fragment for me sometimes. |
131 | // fragment for me sometimes. |
131 | { |
132 | { |
132 | int oval = IP_PMTUDISC_DONT; |
133 | int oval = IP_PMTUDISC_DONT; |
… | |
… | |
137 | sockinfo si (THISNODE, PROT_UDPv4); |
138 | sockinfo si (THISNODE, PROT_UDPv4); |
138 | |
139 | |
139 | if (bind (udpv4_fd, si.sav4 (), si.salenv4 ())) |
140 | if (bind (udpv4_fd, si.sav4 (), si.salenv4 ())) |
140 | { |
141 | { |
141 | 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)); |
142 | exit (1); |
143 | exit (EXIT_FAILURE); |
143 | } |
144 | } |
144 | |
145 | |
145 | udpv4_ev_watcher.start (udpv4_fd, POLLIN); |
146 | udpv4_ev_watcher.start (udpv4_fd, EVENT_READ); |
146 | } |
147 | } |
147 | |
148 | |
148 | icmpv4_fd = -1; |
149 | icmpv4_fd = -1; |
149 | |
150 | |
150 | #if ENABLE_ICMP |
151 | #if ENABLE_ICMP |
… | |
… | |
166 | |
167 | |
167 | setsockopt (icmpv4_fd, SOL_RAW, ICMP_FILTER, &oval, sizeof oval); |
168 | setsockopt (icmpv4_fd, SOL_RAW, ICMP_FILTER, &oval, sizeof oval); |
168 | } |
169 | } |
169 | #endif |
170 | #endif |
170 | |
171 | |
171 | #ifdef IP_MTU_DISCOVER |
172 | #if defined(SOL_IP) && defined(IP_MTU_DISCOVER) |
172 | // this I really consider a linux bug. I am neither connected |
173 | // this I really consider a linux bug. I am neither connected |
173 | // nor do I fragment myself. Linux still sets DF and doesn't |
174 | // nor do I fragment myself. Linux still sets DF and doesn't |
174 | // fragment for me sometimes. |
175 | // fragment for me sometimes. |
175 | { |
176 | { |
176 | int oval = IP_PMTUDISC_DONT; |
177 | int oval = IP_PMTUDISC_DONT; |
… | |
… | |
181 | sockinfo si (THISNODE, PROT_ICMPv4); |
182 | sockinfo si (THISNODE, PROT_ICMPv4); |
182 | |
183 | |
183 | if (bind (icmpv4_fd, si.sav4 (), si.salenv4 ())) |
184 | if (bind (icmpv4_fd, si.sav4 (), si.salenv4 ())) |
184 | { |
185 | { |
185 | 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)); |
186 | exit (1); |
187 | exit (EXIT_FAILURE); |
187 | } |
188 | } |
188 | |
189 | |
189 | icmpv4_ev_watcher.start (icmpv4_fd, POLLIN); |
190 | icmpv4_ev_watcher.start (icmpv4_fd, EVENT_READ); |
190 | } |
191 | } |
191 | #endif |
192 | #endif |
192 | |
193 | |
193 | tcpv4_fd = -1; |
194 | tcpv4_fd = -1; |
194 | |
195 | |
… | |
… | |
211 | sockinfo si (THISNODE, PROT_TCPv4); |
212 | sockinfo si (THISNODE, PROT_TCPv4); |
212 | |
213 | |
213 | if (bind (tcpv4_fd, si.sav4 (), si.salenv4 ())) |
214 | if (bind (tcpv4_fd, si.sav4 (), si.salenv4 ())) |
214 | { |
215 | { |
215 | 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)); |
216 | exit (1); |
217 | exit (EXIT_FAILURE); |
217 | } |
218 | } |
218 | |
219 | |
219 | if (listen (tcpv4_fd, 5)) |
220 | if (listen (tcpv4_fd, 5)) |
220 | { |
221 | { |
221 | 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)); |
222 | exit (1); |
223 | exit (EXIT_FAILURE); |
|
|
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 | // standard daemon practise... |
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241 | { |
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242 | int oval = 1; |
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243 | setsockopt (tcpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval); |
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244 | } |
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245 | |
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246 | sockinfo si (THISNODE, PROT_DNSv4); |
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247 | |
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248 | if (bind (dnsv4_fd, si.sav4 (), si.salenv4 ())) |
223 | } |
249 | { |
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250 | slog (L_ERR, _("can't bind dnsv4 on %s: %s"), (const char *)si, strerror (errno)); |
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251 | exit (EXIT_FAILURE); |
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252 | } |
224 | |
253 | |
225 | tcpv4_ev_watcher.start (tcpv4_fd, POLLIN); |
254 | dnsv4_ev_watcher.start (dnsv4_fd, EVENT_READ); |
226 | } |
255 | } |
227 | #endif |
256 | #endif |
228 | |
257 | |
229 | tap = new tap_device (); |
258 | tap = new tap_device (); |
230 | if (!tap) //D this, of course, never catches |
259 | if (!tap) //D this, of course, never catches |
231 | { |
260 | { |
232 | slog (L_ERR, _("cannot create network interface '%s'"), conf.ifname); |
261 | slog (L_ERR, _("cannot create network interface '%s'"), conf.ifname); |
233 | exit (1); |
262 | exit (EXIT_FAILURE); |
234 | } |
263 | } |
235 | |
264 | |
236 | run_script (run_script_cb (this, &vpn::script_if_up), true); |
265 | run_script (run_script_cb (this, &vpn::script_if_up), true); |
237 | |
266 | |
238 | tap_ev_watcher.start (tap->fd, POLLIN); |
267 | tap_ev_watcher.start (tap->fd, EVENT_READ); |
239 | |
268 | |
240 | reconnect_all (); |
269 | reconnect_all (); |
241 | |
270 | |
242 | return 0; |
271 | return 0; |
243 | } |
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244 | |
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245 | // send a vpn packet out to other hosts |
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246 | bool |
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247 | vpn::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
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248 | { |
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249 | switch (si.prot) |
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250 | { |
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251 | case PROT_IPv4: |
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252 | return send_ipv4_packet (pkt, si, tos); |
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253 | |
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254 | case PROT_UDPv4: |
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255 | return send_udpv4_packet (pkt, si, tos); |
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256 | |
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257 | #if ENABLE_TCP |
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258 | case PROT_TCPv4: |
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259 | return send_tcpv4_packet (pkt, si, tos); |
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260 | #endif |
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261 | |
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262 | #if ENABLE_ICMP |
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263 | case PROT_ICMPv4: |
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264 | return send_icmpv4_packet (pkt, si, tos); |
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265 | #endif |
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266 | |
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267 | default: |
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268 | slog (L_CRIT, _("%s: FATAL: trying to send packet with unsupported protocol"), (const char *)si); |
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269 | return false; |
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270 | } |
|
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271 | } |
272 | } |
272 | |
273 | |
273 | bool |
274 | bool |
274 | vpn::send_ipv4_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
275 | vpn::send_ipv4_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
275 | { |
276 | { |
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277 | #if defined(SOL_IP) && defined(IP_TOS) |
276 | setsockopt (ipv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos); |
278 | setsockopt (ipv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos); |
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279 | #endif |
277 | sendto (ipv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ()); |
280 | sendto (ipv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ()); |
278 | |
281 | |
279 | return true; |
282 | return true; |
280 | } |
283 | } |
281 | |
284 | |
… | |
… | |
300 | sum += (sum >> 16); // carry |
303 | sum += (sum >> 16); // carry |
301 | |
304 | |
302 | return ~sum; |
305 | return ~sum; |
303 | } |
306 | } |
304 | |
307 | |
|
|
308 | #if ENABLE_ICMP |
305 | bool |
309 | bool |
306 | vpn::send_icmpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
310 | vpn::send_icmpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
307 | { |
311 | { |
|
|
312 | #if defined(SOL_IP) && defined(IP_TOS) |
308 | setsockopt (icmpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos); |
313 | setsockopt (icmpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos); |
|
|
314 | #endif |
309 | |
315 | |
310 | pkt->unshift_hdr (4); |
316 | pkt->unshift_hdr (4); |
311 | |
317 | |
312 | icmphdr *hdr = (icmphdr *)&((*pkt)[0]); |
318 | icmp_header *hdr = (icmp_header *)&((*pkt)[0]); |
313 | hdr->type = ::conf.icmp_type; |
319 | hdr->type = ::conf.icmp_type; |
314 | hdr->code = 255; |
320 | hdr->code = 255; |
315 | hdr->checksum = 0; |
321 | hdr->checksum = 0; |
316 | hdr->checksum = ipv4_checksum ((u16 *)hdr, pkt->len); |
322 | hdr->checksum = ipv4_checksum ((u16 *)hdr, pkt->len); |
317 | |
323 | |
318 | sendto (icmpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ()); |
324 | sendto (icmpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ()); |
319 | |
325 | |
320 | return true; |
326 | return true; |
321 | } |
327 | } |
|
|
328 | #endif |
322 | |
329 | |
323 | bool |
330 | bool |
324 | vpn::send_udpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
331 | vpn::send_udpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
325 | { |
332 | { |
|
|
333 | #if defined(SOL_IP) && defined(IP_TOS) |
326 | setsockopt (udpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos); |
334 | setsockopt (udpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos); |
|
|
335 | #endif |
327 | sendto (udpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ()); |
336 | sendto (udpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ()); |
328 | |
337 | |
329 | return true; |
338 | return true; |
|
|
339 | } |
|
|
340 | |
|
|
341 | void |
|
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342 | vpn::inject_data_packet (tap_packet *pkt, int dst) |
|
|
343 | { |
|
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344 | if (dst) |
|
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345 | { |
|
|
346 | // unicast |
|
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347 | if (dst != THISNODE->id) |
|
|
348 | conns[dst - 1]->inject_data_packet (pkt); |
|
|
349 | } |
|
|
350 | else |
|
|
351 | { |
|
|
352 | // broadcast, this is ugly, but due to the security policy |
|
|
353 | // we have to connect to all hosts... |
|
|
354 | for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c) |
|
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355 | if ((*c)->conf != THISNODE) |
|
|
356 | (*c)->inject_data_packet (pkt, true); |
|
|
357 | } |
330 | } |
358 | } |
331 | |
359 | |
332 | void |
360 | void |
333 | vpn::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi) |
361 | vpn::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi) |
334 | { |
362 | { |
… | |
… | |
348 | (const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ()); |
376 | (const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ()); |
349 | else |
377 | else |
350 | { |
378 | { |
351 | connection *c = conns[src - 1]; |
379 | connection *c = conns[src - 1]; |
352 | |
380 | |
353 | if (dst == 0 && !THISNODE->routerprio) |
381 | if (dst == 0) |
354 | slog (L_WARN, _("%s(%s): received broadcast, but we are no router"), |
382 | slog (L_WARN, _("%s(%s): received broadcast (protocol violation)"), |
355 | c->conf->nodename, (const char *)rsi); |
383 | c->conf->nodename, (const char *)rsi); |
356 | else if (dst != 0 && dst != THISNODE->id) |
384 | else if (dst != THISNODE->id) |
357 | { |
385 | { |
358 | if (THISNODE->routerprio) |
386 | if (THISNODE->routerprio) |
359 | // the tos setting gets lost here. who cares. |
387 | // the tos setting gets lost here. who cares. |
360 | conns[dst - 1]->inject_vpn_packet (pkt); |
388 | conns[dst - 1]->inject_vpn_packet (pkt); |
361 | else |
389 | else |
… | |
… | |
370 | } |
398 | } |
371 | |
399 | |
372 | void |
400 | void |
373 | vpn::ipv4_ev (io_watcher &w, short revents) |
401 | vpn::ipv4_ev (io_watcher &w, short revents) |
374 | { |
402 | { |
375 | if (revents & (POLLIN | POLLERR)) |
403 | if (revents & EVENT_READ) |
376 | { |
404 | { |
377 | vpn_packet *pkt = new vpn_packet; |
405 | vpn_packet *pkt = new vpn_packet; |
378 | struct sockaddr_in sa; |
406 | struct sockaddr_in sa; |
379 | socklen_t sa_len = sizeof (sa); |
407 | socklen_t sa_len = sizeof (sa); |
380 | int len; |
408 | int len; |
… | |
… | |
385 | |
413 | |
386 | if (len > 0) |
414 | if (len > 0) |
387 | { |
415 | { |
388 | pkt->len = len; |
416 | pkt->len = len; |
389 | |
417 | |
390 | // raw sockets deliver the ipv4, but don't expect it on sends |
418 | // raw sockets deliver the ipv4 header, but don't expect it on sends |
391 | // this is slow, but... |
|
|
392 | pkt->skip_hdr (IP_OVERHEAD); |
419 | pkt->skip_hdr (IP_OVERHEAD); |
393 | |
420 | |
394 | recv_vpn_packet (pkt, si); |
421 | recv_vpn_packet (pkt, si); |
395 | } |
422 | } |
396 | else |
423 | else |
… | |
… | |
399 | slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno)); |
426 | slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno)); |
400 | } |
427 | } |
401 | |
428 | |
402 | delete pkt; |
429 | delete pkt; |
403 | } |
430 | } |
404 | else if (revents & POLLHUP) |
|
|
405 | { |
|
|
406 | // this cannot ;) happen on udp sockets |
|
|
407 | slog (L_ERR, _("FATAL: POLLHUP on ipv4 fd, terminating.")); |
|
|
408 | exit (1); |
|
|
409 | } |
|
|
410 | else |
431 | else |
411 | { |
432 | { |
412 | slog (L_ERR, |
433 | slog (L_ERR, |
413 | _("FATAL: unknown revents %08x in socket, terminating\n"), |
434 | _("FATAL: unknown revents %08x in socket, terminating\n"), |
414 | revents); |
435 | revents); |
415 | exit (1); |
436 | exit (EXIT_FAILURE); |
416 | } |
437 | } |
417 | } |
438 | } |
418 | |
439 | |
|
|
440 | #if ENABLE_ICMP |
419 | void |
441 | void |
420 | vpn::icmpv4_ev (io_watcher &w, short revents) |
442 | vpn::icmpv4_ev (io_watcher &w, short revents) |
421 | { |
443 | { |
422 | if (revents & (POLLIN | POLLERR)) |
444 | if (revents & EVENT_READ) |
423 | { |
445 | { |
424 | vpn_packet *pkt = new vpn_packet; |
446 | vpn_packet *pkt = new vpn_packet; |
425 | struct sockaddr_in sa; |
447 | struct sockaddr_in sa; |
426 | socklen_t sa_len = sizeof (sa); |
448 | socklen_t sa_len = sizeof (sa); |
427 | int len; |
449 | int len; |
… | |
… | |
432 | |
454 | |
433 | if (len > 0) |
455 | if (len > 0) |
434 | { |
456 | { |
435 | pkt->len = len; |
457 | pkt->len = len; |
436 | |
458 | |
437 | icmphdr *hdr = (icmphdr *)&((*pkt)[IP_OVERHEAD]); |
459 | icmp_header *hdr = (icmp_header *)&((*pkt)[IP_OVERHEAD]); |
438 | |
460 | |
439 | if (hdr->type == ::conf.icmp_type |
461 | if (hdr->type == ::conf.icmp_type |
440 | && hdr->code == 255) |
462 | && hdr->code == 255) |
441 | { |
463 | { |
442 | // raw sockets deliver the ipv4, but don't expect it on sends |
464 | // raw sockets deliver the ipv4, but don't expect it on sends |
… | |
… | |
452 | slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno)); |
474 | slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno)); |
453 | } |
475 | } |
454 | |
476 | |
455 | delete pkt; |
477 | delete pkt; |
456 | } |
478 | } |
457 | else if (revents & POLLHUP) |
|
|
458 | { |
|
|
459 | // this cannot ;) happen on udp sockets |
|
|
460 | slog (L_ERR, _("FATAL: POLLHUP on icmpv4 fd, terminating.")); |
|
|
461 | exit (1); |
|
|
462 | } |
|
|
463 | else |
479 | else |
464 | { |
480 | { |
465 | slog (L_ERR, |
481 | slog (L_ERR, |
466 | _("FATAL: unknown revents %08x in socket, terminating\n"), |
482 | _("FATAL: unknown revents %08x in socket, terminating\n"), |
467 | revents); |
483 | revents); |
468 | exit (1); |
484 | exit (EXIT_FAILURE); |
469 | } |
485 | } |
470 | } |
486 | } |
|
|
487 | #endif |
471 | |
488 | |
472 | void |
489 | void |
473 | vpn::udpv4_ev (io_watcher &w, short revents) |
490 | vpn::udpv4_ev (io_watcher &w, short revents) |
474 | { |
491 | { |
475 | if (revents & (POLLIN | POLLERR)) |
492 | if (revents & EVENT_READ) |
476 | { |
493 | { |
477 | vpn_packet *pkt = new vpn_packet; |
494 | vpn_packet *pkt = new vpn_packet; |
478 | struct sockaddr_in sa; |
495 | struct sockaddr_in sa; |
479 | socklen_t sa_len = sizeof (sa); |
496 | socklen_t sa_len = sizeof (sa); |
480 | int len; |
497 | int len; |
… | |
… | |
495 | slog (L_DEBUG, _("%s: fd %d, %s"), (const char *)si, w.fd, strerror (errno)); |
512 | slog (L_DEBUG, _("%s: fd %d, %s"), (const char *)si, w.fd, strerror (errno)); |
496 | } |
513 | } |
497 | |
514 | |
498 | delete pkt; |
515 | delete pkt; |
499 | } |
516 | } |
500 | else if (revents & POLLHUP) |
|
|
501 | { |
|
|
502 | // this cannot ;) happen on udp sockets |
|
|
503 | slog (L_ERR, _("FATAL: POLLHUP on udp v4 fd, terminating.")); |
|
|
504 | exit (1); |
|
|
505 | } |
|
|
506 | else |
517 | else |
507 | { |
518 | { |
508 | slog (L_ERR, |
519 | slog (L_ERR, |
509 | _("FATAL: unknown revents %08x in socket, terminating\n"), |
520 | _("FATAL: unknown revents %08x in socket, terminating\n"), |
510 | revents); |
521 | revents); |
511 | exit (1); |
522 | exit (EXIT_FAILURE); |
512 | } |
523 | } |
513 | } |
524 | } |
514 | |
525 | |
515 | void |
526 | void |
516 | vpn::tap_ev (io_watcher &w, short revents) |
527 | vpn::tap_ev (io_watcher &w, short revents) |
517 | { |
528 | { |
518 | if (revents & POLLIN) |
529 | if (revents & EVENT_READ) |
519 | { |
530 | { |
520 | /* process data */ |
531 | /* process data */ |
521 | tap_packet *pkt; |
532 | tap_packet *pkt; |
522 | |
533 | |
523 | pkt = tap->recv (); |
534 | pkt = tap->recv (); |
524 | |
535 | |
|
|
536 | if (!pkt) |
|
|
537 | return; |
|
|
538 | |
|
|
539 | if (pkt->len > 14) |
|
|
540 | { |
525 | int dst = mac2id (pkt->dst); |
541 | int dst = mac2id (pkt->dst); |
526 | int src = mac2id (pkt->src); |
542 | int src = mac2id (pkt->src); |
527 | |
543 | |
528 | if (src != THISNODE->id) |
544 | if (src != THISNODE->id) |
529 | { |
|
|
530 | slog (L_ERR, _("FATAL: tap packet not originating on current node received, terminating.")); |
|
|
531 | exit (1); |
|
|
532 | } |
|
|
533 | |
|
|
534 | if (dst == THISNODE->id) |
|
|
535 | { |
|
|
536 | slog (L_ERR, _("FATAL: tap packet destined for current node received, terminating.")); |
|
|
537 | exit (1); |
|
|
538 | } |
|
|
539 | |
|
|
540 | if (dst > conns.size ()) |
|
|
541 | slog (L_ERR, _("tap packet for unknown node %d received, ignoring."), dst); |
|
|
542 | else |
|
|
543 | { |
|
|
544 | if (dst) |
|
|
545 | { |
545 | { |
546 | // unicast |
546 | slog (L_ERR, _("FATAL: tap packet not originating on current node received (if-up script not working properly?), exiting.")); |
547 | if (dst != THISNODE->id) |
547 | exit (EXIT_FAILURE); |
548 | conns[dst - 1]->inject_data_packet (pkt); |
|
|
549 | } |
548 | } |
|
|
549 | |
|
|
550 | if (dst == THISNODE->id) |
|
|
551 | { |
|
|
552 | slog (L_ERR, _("FATAL: tap packet destined for current node received, exiting.")); |
|
|
553 | exit (EXIT_FAILURE); |
|
|
554 | } |
|
|
555 | |
|
|
556 | if (dst > conns.size ()) |
|
|
557 | slog (L_ERR, _("tap packet for unknown node %d received, ignoring."), dst); |
550 | else |
558 | else |
551 | { |
|
|
552 | // broadcast, first check router, then self, then english |
|
|
553 | connection *router = find_router (); |
|
|
554 | |
|
|
555 | if (router) |
|
|
556 | router->inject_data_packet (pkt, true); |
559 | inject_data_packet (pkt, dst); |
557 | else |
|
|
558 | for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c) |
|
|
559 | if ((*c)->conf != THISNODE) |
|
|
560 | (*c)->inject_data_packet (pkt); |
|
|
561 | } |
|
|
562 | } |
560 | } |
563 | |
561 | |
564 | delete pkt; |
562 | delete pkt; |
565 | } |
|
|
566 | else if (revents & (POLLHUP | POLLERR)) |
|
|
567 | { |
|
|
568 | slog (L_ERR, _("FATAL: POLLHUP or POLLERR on network device fd, terminating.")); |
|
|
569 | exit (1); |
|
|
570 | } |
563 | } |
571 | else |
564 | else |
572 | abort (); |
565 | abort (); |
573 | } |
566 | } |
574 | |
567 | |
… | |
… | |
580 | if (events & EVENT_SHUTDOWN) |
573 | if (events & EVENT_SHUTDOWN) |
581 | { |
574 | { |
582 | slog (L_INFO, _("preparing shutdown...")); |
575 | slog (L_INFO, _("preparing shutdown...")); |
583 | |
576 | |
584 | shutdown_all (); |
577 | shutdown_all (); |
585 | |
|
|
586 | remove_pid (pidfilename); |
578 | remove_pid (conf.pidfilename); |
587 | |
|
|
588 | slog (L_INFO, _("terminating")); |
579 | slog (L_INFO, _("terminating")); |
589 | |
580 | exit (EXIT_SUCCESS); |
590 | exit (0); |
|
|
591 | } |
581 | } |
592 | |
582 | |
593 | if (events & EVENT_RECONNECT) |
583 | if (events & EVENT_RECONNECT) |
594 | { |
584 | { |
595 | slog (L_INFO, _("forced reconnect")); |
585 | slog (L_INFO, _("forced reconnect")); |
… | |
… | |
597 | reconnect_all (); |
587 | reconnect_all (); |
598 | } |
588 | } |
599 | |
589 | |
600 | events = 0; |
590 | events = 0; |
601 | } |
591 | } |
602 | |
|
|
603 | w.at = TSTAMP_CANCEL; |
|
|
604 | } |
592 | } |
605 | |
593 | |
606 | void |
594 | void |
607 | vpn::shutdown_all () |
595 | vpn::shutdown_all () |
608 | { |
596 | { |
… | |
… | |
621 | connection_init (); |
609 | connection_init (); |
622 | |
610 | |
623 | for (configuration::node_vector::iterator i = conf.nodes.begin (); |
611 | for (configuration::node_vector::iterator i = conf.nodes.begin (); |
624 | i != conf.nodes.end (); ++i) |
612 | i != conf.nodes.end (); ++i) |
625 | { |
613 | { |
626 | connection *conn = new connection (this); |
614 | connection *conn = new connection (this, *i); |
627 | |
|
|
628 | conn->conf = *i; |
|
|
629 | conns.push_back (conn); |
615 | conns.push_back (conn); |
630 | |
|
|
631 | conn->establish_connection (); |
616 | conn->establish_connection (); |
632 | } |
617 | } |
633 | } |
618 | } |
634 | |
619 | |
635 | connection *vpn::find_router () |
620 | connection *vpn::find_router () |
636 | { |
621 | { |
637 | u32 prio = 0; |
622 | u32 prio = 1; |
638 | connection *router = 0; |
623 | connection *router = 0; |
639 | |
624 | |
640 | for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i) |
625 | for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i) |
641 | { |
626 | { |
642 | connection *c = *i; |
627 | connection *c = *i; |
643 | |
628 | |
644 | if (c->conf->routerprio > prio |
629 | if (c->conf->routerprio > prio |
645 | && c->connectmode == conf_node::C_ALWAYS // so we don't drop the connection if in use |
630 | && c->connectmode == conf_node::C_ALWAYS // so we don't drop the connection if in use |
646 | && c->ictx && c->octx |
631 | && c->ictx && c->octx |
647 | && c->conf != THISNODE // redundant, since ictx==octx==0 always on thisnode |
632 | && c->conf != THISNODE) // redundant, since ictx==octx==0 always on thisnode |
648 | && (!THISNODE->routerprio |
|
|
649 | || c->conf->routerprio <= THISNODE->routerprio)) |
|
|
650 | { |
633 | { |
651 | prio = c->conf->routerprio; |
634 | prio = c->conf->routerprio; |
652 | router = c; |
635 | router = c; |
653 | } |
636 | } |
654 | } |
637 | } |
… | |
… | |
663 | if (c) |
646 | if (c) |
664 | c->send_connect_request (id); |
647 | c->send_connect_request (id); |
665 | else |
648 | else |
666 | // no router found, aggressively connect to all routers |
649 | // no router found, aggressively connect to all routers |
667 | for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i) |
650 | for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i) |
668 | if ((*i)->conf->routerprio) |
651 | if ((*i)->conf->routerprio && (*i)->conf != THISNODE) |
669 | (*i)->establish_connection (); |
652 | (*i)->establish_connection (); |
670 | } |
653 | } |
671 | |
654 | |
672 | void |
655 | void |
673 | connection::dump_status () |
656 | connection::dump_status () |
… | |
… | |
700 | , tcpv4_ev_watcher (this, &vpn::tcpv4_ev) |
683 | , tcpv4_ev_watcher (this, &vpn::tcpv4_ev) |
701 | #endif |
684 | #endif |
702 | #if ENABLE_ICMP |
685 | #if ENABLE_ICMP |
703 | , icmpv4_ev_watcher(this, &vpn::icmpv4_ev) |
686 | , icmpv4_ev_watcher(this, &vpn::icmpv4_ev) |
704 | #endif |
687 | #endif |
|
|
688 | #if ENABLE_DNS |
|
|
689 | , dnsv4_ev_watcher (this, &vpn::dnsv4_ev) |
|
|
690 | #endif |
705 | , tap_ev_watcher (this, &vpn::tap_ev) |
691 | , tap_ev_watcher (this, &vpn::tap_ev) |
706 | { |
692 | { |
707 | } |
693 | } |
708 | |
694 | |
709 | vpn::~vpn () |
695 | vpn::~vpn () |