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" |
44 | |
46 | |
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47 | vpn network; // THE vpn (bad design...) |
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48 | |
45 | ///////////////////////////////////////////////////////////////////////////// |
49 | ///////////////////////////////////////////////////////////////////////////// |
46 | |
50 | |
47 | const char *vpn::script_if_up () |
51 | void |
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52 | vpn::script_init_env () |
48 | { |
53 | { |
49 | // the tunnel device mtu should be the physical mtu - overhead |
54 | // the tunnel device mtu should be the physical mtu - overhead |
50 | // the tricky part is rounding to the cipher key blocksize |
55 | // the tricky part is rounding to the cipher key blocksize |
51 | int mtu = conf.mtu - ETH_OVERHEAD - VPE_OVERHEAD - MAX_OVERHEAD; |
56 | int mtu = conf.mtu - ETH_OVERHEAD - VPE_OVERHEAD - MAX_OVERHEAD; |
52 | mtu += ETH_OVERHEAD - 6 - 6; // now we have the data portion |
57 | mtu += ETH_OVERHEAD - 6 - 6; // now we have the data portion |
53 | mtu -= mtu % EVP_CIPHER_block_size (CIPHER); // round |
58 | mtu -= mtu % EVP_CIPHER_block_size (CIPHER); // round |
54 | mtu -= ETH_OVERHEAD - 6 - 6; // and get interface mtu again |
59 | mtu -= ETH_OVERHEAD - 6 - 6; // and get interface mtu again |
55 | |
60 | |
56 | char *env; |
61 | char *env; |
57 | asprintf (&env, "CONFBASE=%s", confbase); |
62 | asprintf (&env, "CONFBASE=%s", confbase); putenv (env); |
58 | putenv (env); |
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59 | asprintf (&env, "NODENAME=%s", THISNODE->nodename); |
63 | asprintf (&env, "NODENAME=%s", THISNODE->nodename); putenv (env); |
60 | putenv (env); |
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61 | asprintf (&env, "NODEID=%d", THISNODE->id); |
64 | asprintf (&env, "NODEID=%d", THISNODE->id); putenv (env); |
62 | putenv (env); |
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63 | asprintf (&env, "IFNAME=%s", tap->interface ()); |
65 | asprintf (&env, "IFNAME=%s", tap->interface ()); putenv (env); |
64 | putenv (env); |
66 | asprintf (&env, "IFTYPE=%s", IFTYPE); putenv (env); |
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67 | asprintf (&env, "IFSUBTYPE=%s", IFSUBTYPE); putenv (env); |
65 | asprintf (&env, "MTU=%d", mtu); |
68 | asprintf (&env, "MTU=%d", mtu); putenv (env); |
66 | putenv (env); |
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67 | asprintf (&env, "MAC=%02x:%02x:%02x:%02x:%02x:%02x", |
69 | asprintf (&env, "MAC=%02x:%02x:%02x:%02x:%02x:%02x", |
68 | 0xfe, 0xfd, 0x80, 0x00, THISNODE->id >> 8, |
70 | 0xfe, 0xfd, 0x80, 0x00, THISNODE->id >> 8, |
69 | THISNODE->id & 0xff); |
71 | THISNODE->id & 0xff); putenv (env); |
70 | putenv (env); |
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71 | |
72 | |
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73 | // TODO: info for other nodes, maybe? |
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74 | } |
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75 | |
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76 | const char *vpn::script_if_init () |
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77 | { |
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78 | script_init_env (); |
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79 | |
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80 | return tap->if_up (); |
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81 | } |
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82 | |
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83 | const char *vpn::script_if_up () |
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84 | { |
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85 | script_init_env (); |
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86 | |
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87 | char *filename; |
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88 | asprintf (&filename, |
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89 | "%s/%s", |
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90 | confbase, |
72 | return ::conf.script_if_up ? ::conf.script_if_up : "if-up"; |
91 | ::conf.script_if_up ? ::conf.script_if_up : "if-up"); |
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92 | |
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93 | return filename; |
73 | } |
94 | } |
74 | |
95 | |
75 | int |
96 | int |
76 | vpn::setup () |
97 | vpn::setup () |
77 | { |
98 | { |
… | |
… | |
84 | if (ipv4_fd < 0) |
105 | if (ipv4_fd < 0) |
85 | return -1; |
106 | return -1; |
86 | |
107 | |
87 | fcntl (ipv4_fd, F_SETFL, O_NONBLOCK); |
108 | fcntl (ipv4_fd, F_SETFL, O_NONBLOCK); |
88 | |
109 | |
89 | #ifdef IP_MTU_DISCOVER |
110 | #if defined(SOL_IP) && defined(IP_MTU_DISCOVER) |
90 | // this I really consider a linux bug. I am neither connected |
111 | // this I really consider a linux bug. I am neither connected |
91 | // nor do I fragment myself. Linux still sets DF and doesn't |
112 | // nor do I fragment myself. Linux still sets DF and doesn't |
92 | // fragment for me sometimes. |
113 | // fragment for me sometimes. |
93 | { |
114 | { |
94 | int oval = IP_PMTUDISC_DONT; |
115 | int oval = IP_PMTUDISC_DONT; |
… | |
… | |
99 | sockinfo si (THISNODE, PROT_IPv4); |
120 | sockinfo si (THISNODE, PROT_IPv4); |
100 | |
121 | |
101 | if (bind (ipv4_fd, si.sav4 (), si.salenv4 ())) |
122 | if (bind (ipv4_fd, si.sav4 (), si.salenv4 ())) |
102 | { |
123 | { |
103 | slog (L_ERR, _("can't bind ipv4 socket on %s: %s"), (const char *)si, strerror (errno)); |
124 | slog (L_ERR, _("can't bind ipv4 socket on %s: %s"), (const char *)si, strerror (errno)); |
104 | exit (1); |
125 | exit (EXIT_FAILURE); |
105 | } |
126 | } |
106 | |
127 | |
107 | ipv4_ev_watcher.start (ipv4_fd, POLLIN); |
128 | ipv4_ev_watcher.start (ipv4_fd, EVENT_READ); |
108 | } |
129 | } |
109 | |
130 | |
110 | udpv4_fd = -1; |
131 | udpv4_fd = -1; |
111 | |
132 | |
112 | if (THISNODE->protocols & PROT_UDPv4 && THISNODE->udp_port) |
133 | if (THISNODE->protocols & PROT_UDPv4 && THISNODE->udp_port) |
… | |
… | |
122 | { |
143 | { |
123 | int oval = 1; |
144 | int oval = 1; |
124 | setsockopt (udpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval); |
145 | setsockopt (udpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval); |
125 | } |
146 | } |
126 | |
147 | |
127 | #ifdef IP_MTU_DISCOVER |
148 | #if defined(SOL_IP) && defined(IP_MTU_DISCOVER) |
128 | // this I really consider a linux bug. I am neither connected |
149 | // this I really consider a linux bug. I am neither connected |
129 | // nor do I fragment myself. Linux still sets DF and doesn't |
150 | // nor do I fragment myself. Linux still sets DF and doesn't |
130 | // fragment for me sometimes. |
151 | // fragment for me sometimes. |
131 | { |
152 | { |
132 | int oval = IP_PMTUDISC_DONT; |
153 | int oval = IP_PMTUDISC_DONT; |
… | |
… | |
137 | sockinfo si (THISNODE, PROT_UDPv4); |
158 | sockinfo si (THISNODE, PROT_UDPv4); |
138 | |
159 | |
139 | if (bind (udpv4_fd, si.sav4 (), si.salenv4 ())) |
160 | if (bind (udpv4_fd, si.sav4 (), si.salenv4 ())) |
140 | { |
161 | { |
141 | slog (L_ERR, _("can't bind udpv4 on %s: %s"), (const char *)si, strerror (errno)); |
162 | slog (L_ERR, _("can't bind udpv4 on %s: %s"), (const char *)si, strerror (errno)); |
142 | exit (1); |
163 | exit (EXIT_FAILURE); |
143 | } |
164 | } |
144 | |
165 | |
145 | udpv4_ev_watcher.start (udpv4_fd, POLLIN); |
166 | udpv4_ev_watcher.start (udpv4_fd, EVENT_READ); |
146 | } |
167 | } |
147 | |
168 | |
148 | icmpv4_fd = -1; |
169 | icmpv4_fd = -1; |
149 | |
170 | |
150 | #if ENABLE_ICMP |
171 | #if ENABLE_ICMP |
… | |
… | |
166 | |
187 | |
167 | setsockopt (icmpv4_fd, SOL_RAW, ICMP_FILTER, &oval, sizeof oval); |
188 | setsockopt (icmpv4_fd, SOL_RAW, ICMP_FILTER, &oval, sizeof oval); |
168 | } |
189 | } |
169 | #endif |
190 | #endif |
170 | |
191 | |
171 | #ifdef IP_MTU_DISCOVER |
192 | #if defined(SOL_IP) && defined(IP_MTU_DISCOVER) |
172 | // this I really consider a linux bug. I am neither connected |
193 | // this I really consider a linux bug. I am neither connected |
173 | // nor do I fragment myself. Linux still sets DF and doesn't |
194 | // nor do I fragment myself. Linux still sets DF and doesn't |
174 | // fragment for me sometimes. |
195 | // fragment for me sometimes. |
175 | { |
196 | { |
176 | int oval = IP_PMTUDISC_DONT; |
197 | int oval = IP_PMTUDISC_DONT; |
… | |
… | |
181 | sockinfo si (THISNODE, PROT_ICMPv4); |
202 | sockinfo si (THISNODE, PROT_ICMPv4); |
182 | |
203 | |
183 | if (bind (icmpv4_fd, si.sav4 (), si.salenv4 ())) |
204 | if (bind (icmpv4_fd, si.sav4 (), si.salenv4 ())) |
184 | { |
205 | { |
185 | slog (L_ERR, _("can't bind icmpv4 on %s: %s"), (const char *)si, strerror (errno)); |
206 | slog (L_ERR, _("can't bind icmpv4 on %s: %s"), (const char *)si, strerror (errno)); |
186 | exit (1); |
207 | exit (EXIT_FAILURE); |
187 | } |
208 | } |
188 | |
209 | |
189 | icmpv4_ev_watcher.start (icmpv4_fd, POLLIN); |
210 | icmpv4_ev_watcher.start (icmpv4_fd, EVENT_READ); |
190 | } |
211 | } |
191 | #endif |
212 | #endif |
192 | |
213 | |
193 | tcpv4_fd = -1; |
214 | tcpv4_fd = -1; |
194 | |
215 | |
… | |
… | |
211 | sockinfo si (THISNODE, PROT_TCPv4); |
232 | sockinfo si (THISNODE, PROT_TCPv4); |
212 | |
233 | |
213 | if (bind (tcpv4_fd, si.sav4 (), si.salenv4 ())) |
234 | if (bind (tcpv4_fd, si.sav4 (), si.salenv4 ())) |
214 | { |
235 | { |
215 | slog (L_ERR, _("can't bind tcpv4 on %s: %s"), (const char *)si, strerror (errno)); |
236 | slog (L_ERR, _("can't bind tcpv4 on %s: %s"), (const char *)si, strerror (errno)); |
216 | exit (1); |
237 | exit (EXIT_FAILURE); |
217 | } |
238 | } |
218 | |
239 | |
219 | if (listen (tcpv4_fd, 5)) |
240 | if (listen (tcpv4_fd, 5)) |
220 | { |
241 | { |
221 | slog (L_ERR, _("can't listen tcpv4 on %s: %s"), (const char *)si, strerror (errno)); |
242 | slog (L_ERR, _("can't listen tcpv4 on %s: %s"), (const char *)si, strerror (errno)); |
222 | exit (1); |
243 | exit (EXIT_FAILURE); |
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244 | } |
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245 | |
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246 | tcpv4_ev_watcher.start (tcpv4_fd, EVENT_READ); |
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247 | } |
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248 | #endif |
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249 | |
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250 | #if ENABLE_DNS |
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251 | if (THISNODE->protocols & PROT_DNSv4) |
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252 | { |
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253 | dns_forwarder.set (::conf.dns_forw_host, ::conf.dns_forw_port, PROT_DNSv4); |
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254 | |
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255 | dnsv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP); |
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256 | |
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257 | if (dnsv4_fd < 0) |
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258 | return -1; |
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259 | |
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260 | #if defined(SOL_IP) && defined(IP_MTU_DISCOVER) |
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261 | // this I really consider a linux bug. I am neither connected |
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262 | // nor do I fragment myself. Linux still sets DF and doesn't |
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263 | // fragment for me sometimes. |
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264 | { |
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265 | int oval = IP_PMTUDISC_DONT; |
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266 | setsockopt (udpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval); |
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267 | } |
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268 | #endif |
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269 | |
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270 | // standard daemon practise... |
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271 | { |
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272 | int oval = 1; |
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273 | setsockopt (dnsv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval); |
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274 | } |
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275 | |
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276 | sockinfo si (THISNODE->dns_hostname, |
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277 | THISNODE->dns_hostname ? THISNODE->dns_port : 0, |
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278 | PROT_DNSv4); |
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279 | |
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280 | if (bind (dnsv4_fd, si.sav4 (), si.salenv4 ())) |
223 | } |
281 | { |
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282 | slog (L_ERR, _("can't bind dnsv4 on %s: %s"), (const char *)si, strerror (errno)); |
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283 | exit (EXIT_FAILURE); |
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284 | } |
224 | |
285 | |
225 | tcpv4_ev_watcher.start (tcpv4_fd, POLLIN); |
286 | dnsv4_ev_watcher.start (dnsv4_fd, EVENT_READ); |
226 | } |
287 | } |
227 | #endif |
288 | #endif |
228 | |
289 | |
229 | tap = new tap_device (); |
290 | tap = new tap_device (); |
230 | if (!tap) //D this, of course, never catches |
291 | if (!tap) //D this, of course, never catches |
231 | { |
292 | { |
232 | slog (L_ERR, _("cannot create network interface '%s'"), conf.ifname); |
293 | slog (L_ERR, _("cannot create network interface '%s'"), conf.ifname); |
233 | exit (1); |
294 | exit (EXIT_FAILURE); |
234 | } |
295 | } |
235 | |
296 | |
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297 | if (tap->if_up () && |
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298 | !run_script (run_script_cb (this, &vpn::script_if_init), true)) |
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299 | { |
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300 | slog (L_ERR, _("interface initialization command '%s' failed, exiting."), |
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301 | tap->if_up ()); |
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302 | exit (EXIT_FAILURE); |
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303 | } |
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304 | |
236 | run_script (run_script_cb (this, &vpn::script_if_up), true); |
305 | if (!run_script (run_script_cb (this, &vpn::script_if_up), true)) |
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306 | { |
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307 | slog (L_ERR, _("if-up command execution failed, exiting.")); |
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308 | exit (EXIT_FAILURE); |
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309 | } |
237 | |
310 | |
238 | tap_ev_watcher.start (tap->fd, POLLIN); |
311 | tap_ev_watcher.start (tap->fd, EVENT_READ); |
239 | |
312 | |
240 | reconnect_all (); |
313 | reconnect_all (); |
241 | |
314 | |
242 | return 0; |
315 | 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 | } |
316 | } |
272 | |
317 | |
273 | bool |
318 | bool |
274 | vpn::send_ipv4_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
319 | vpn::send_ipv4_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
275 | { |
320 | { |
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321 | #if defined(SOL_IP) && defined(IP_TOS) |
276 | setsockopt (ipv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos); |
322 | setsockopt (ipv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos); |
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323 | #endif |
277 | sendto (ipv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ()); |
324 | sendto (ipv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ()); |
278 | |
325 | |
279 | return true; |
326 | return true; |
280 | } |
327 | } |
281 | |
328 | |
… | |
… | |
304 | |
351 | |
305 | #if ENABLE_ICMP |
352 | #if ENABLE_ICMP |
306 | bool |
353 | bool |
307 | vpn::send_icmpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
354 | vpn::send_icmpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
308 | { |
355 | { |
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356 | #if defined(SOL_IP) && defined(IP_TOS) |
309 | setsockopt (icmpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos); |
357 | setsockopt (icmpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos); |
|
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358 | #endif |
310 | |
359 | |
311 | pkt->unshift_hdr (4); |
360 | pkt->unshift_hdr (4); |
312 | |
361 | |
313 | icmphdr *hdr = (icmphdr *)&((*pkt)[0]); |
362 | icmp_header *hdr = (icmp_header *)&((*pkt)[0]); |
314 | hdr->type = ::conf.icmp_type; |
363 | hdr->type = ::conf.icmp_type; |
315 | hdr->code = 255; |
364 | hdr->code = 255; |
316 | hdr->checksum = 0; |
365 | hdr->checksum = 0; |
317 | hdr->checksum = ipv4_checksum ((u16 *)hdr, pkt->len); |
366 | hdr->checksum = ipv4_checksum ((u16 *)hdr, pkt->len); |
318 | |
367 | |
… | |
… | |
323 | #endif |
372 | #endif |
324 | |
373 | |
325 | bool |
374 | bool |
326 | vpn::send_udpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
375 | vpn::send_udpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
327 | { |
376 | { |
|
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377 | #if defined(SOL_IP) && defined(IP_TOS) |
328 | setsockopt (udpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos); |
378 | setsockopt (udpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos); |
|
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379 | #endif |
329 | sendto (udpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ()); |
380 | sendto (udpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ()); |
330 | |
381 | |
331 | return true; |
382 | return true; |
|
|
383 | } |
|
|
384 | |
|
|
385 | void |
|
|
386 | vpn::inject_data_packet (tap_packet *pkt, int dst) |
|
|
387 | { |
|
|
388 | if (dst) |
|
|
389 | { |
|
|
390 | // unicast |
|
|
391 | if (dst != THISNODE->id) |
|
|
392 | conns[dst - 1]->inject_data_packet (pkt); |
|
|
393 | } |
|
|
394 | else |
|
|
395 | { |
|
|
396 | // broadcast, this is ugly, but due to the security policy |
|
|
397 | // we have to connect to all hosts... |
|
|
398 | for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c) |
|
|
399 | if ((*c)->conf != THISNODE) |
|
|
400 | (*c)->inject_data_packet (pkt, true); |
|
|
401 | } |
332 | } |
402 | } |
333 | |
403 | |
334 | void |
404 | void |
335 | vpn::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi) |
405 | vpn::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi) |
336 | { |
406 | { |
… | |
… | |
353 | connection *c = conns[src - 1]; |
423 | connection *c = conns[src - 1]; |
354 | |
424 | |
355 | if (dst == 0) |
425 | if (dst == 0) |
356 | slog (L_WARN, _("%s(%s): received broadcast (protocol violation)"), |
426 | slog (L_WARN, _("%s(%s): received broadcast (protocol violation)"), |
357 | c->conf->nodename, (const char *)rsi); |
427 | c->conf->nodename, (const char *)rsi); |
358 | else if (dst != 0 && dst != THISNODE->id) |
428 | else if (dst != THISNODE->id) |
359 | { |
429 | { |
360 | if (THISNODE->routerprio) |
430 | if (THISNODE->routerprio) |
361 | // the tos setting gets lost here. who cares. |
431 | // the tos setting gets lost here. who cares. |
362 | conns[dst - 1]->inject_vpn_packet (pkt); |
432 | conns[dst - 1]->inject_vpn_packet (pkt); |
363 | else |
433 | else |
… | |
… | |
369 | else |
439 | else |
370 | c->recv_vpn_packet (pkt, rsi); |
440 | c->recv_vpn_packet (pkt, rsi); |
371 | } |
441 | } |
372 | } |
442 | } |
373 | |
443 | |
|
|
444 | bool |
|
|
445 | vpn::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
|
|
446 | { |
|
|
447 | switch (si.prot) |
|
|
448 | { |
|
|
449 | case PROT_IPv4: |
|
|
450 | return send_ipv4_packet (pkt, si, tos); |
|
|
451 | case PROT_UDPv4: |
|
|
452 | return send_udpv4_packet (pkt, si, tos); |
|
|
453 | #if ENABLE_TCP |
|
|
454 | case PROT_TCPv4: |
|
|
455 | return send_tcpv4_packet (pkt, si, tos); |
|
|
456 | #endif |
|
|
457 | #if ENABLE_ICMP |
|
|
458 | case PROT_ICMPv4: |
|
|
459 | return send_icmpv4_packet (pkt, si, tos); |
|
|
460 | #endif |
|
|
461 | #if ENABLE_DNS |
|
|
462 | case PROT_DNSv4: |
|
|
463 | return send_dnsv4_packet (pkt, si, tos); |
|
|
464 | #endif |
|
|
465 | |
|
|
466 | default: |
|
|
467 | slog (L_CRIT, _("%s: FATAL: trying to send packet with unsupported protocol"), (const char *)si); |
|
|
468 | } |
|
|
469 | |
|
|
470 | return false; |
|
|
471 | } |
|
|
472 | |
374 | void |
473 | void |
375 | vpn::ipv4_ev (io_watcher &w, short revents) |
474 | vpn::ipv4_ev (io_watcher &w, short revents) |
376 | { |
475 | { |
377 | if (revents & (POLLIN | POLLERR)) |
476 | if (revents & EVENT_READ) |
378 | { |
477 | { |
379 | vpn_packet *pkt = new vpn_packet; |
478 | vpn_packet *pkt = new vpn_packet; |
380 | struct sockaddr_in sa; |
479 | struct sockaddr_in sa; |
381 | socklen_t sa_len = sizeof (sa); |
480 | socklen_t sa_len = sizeof (sa); |
382 | int len; |
481 | int len; |
… | |
… | |
387 | |
486 | |
388 | if (len > 0) |
487 | if (len > 0) |
389 | { |
488 | { |
390 | pkt->len = len; |
489 | pkt->len = len; |
391 | |
490 | |
392 | // raw sockets deliver the ipv4, but don't expect it on sends |
491 | // raw sockets deliver the ipv4 header, but don't expect it on sends |
393 | // this is slow, but... |
|
|
394 | pkt->skip_hdr (IP_OVERHEAD); |
492 | pkt->skip_hdr (IP_OVERHEAD); |
395 | |
493 | |
396 | recv_vpn_packet (pkt, si); |
494 | recv_vpn_packet (pkt, si); |
397 | } |
495 | } |
398 | else |
496 | else |
… | |
… | |
401 | slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno)); |
499 | slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno)); |
402 | } |
500 | } |
403 | |
501 | |
404 | delete pkt; |
502 | delete pkt; |
405 | } |
503 | } |
406 | else if (revents & POLLHUP) |
|
|
407 | { |
|
|
408 | // this cannot ;) happen on udp sockets |
|
|
409 | slog (L_ERR, _("FATAL: POLLHUP on ipv4 fd, terminating.")); |
|
|
410 | exit (1); |
|
|
411 | } |
|
|
412 | else |
504 | else |
413 | { |
505 | { |
414 | slog (L_ERR, |
506 | slog (L_ERR, |
415 | _("FATAL: unknown revents %08x in socket, terminating\n"), |
507 | _("FATAL: unknown revents %08x in socket, terminating\n"), |
416 | revents); |
508 | revents); |
417 | exit (1); |
509 | exit (EXIT_FAILURE); |
418 | } |
510 | } |
419 | } |
511 | } |
420 | |
512 | |
421 | #if ENABLE_ICMP |
513 | #if ENABLE_ICMP |
422 | void |
514 | void |
423 | vpn::icmpv4_ev (io_watcher &w, short revents) |
515 | vpn::icmpv4_ev (io_watcher &w, short revents) |
424 | { |
516 | { |
425 | if (revents & (POLLIN | POLLERR)) |
517 | if (revents & EVENT_READ) |
426 | { |
518 | { |
427 | vpn_packet *pkt = new vpn_packet; |
519 | vpn_packet *pkt = new vpn_packet; |
428 | struct sockaddr_in sa; |
520 | struct sockaddr_in sa; |
429 | socklen_t sa_len = sizeof (sa); |
521 | socklen_t sa_len = sizeof (sa); |
430 | int len; |
522 | int len; |
… | |
… | |
435 | |
527 | |
436 | if (len > 0) |
528 | if (len > 0) |
437 | { |
529 | { |
438 | pkt->len = len; |
530 | pkt->len = len; |
439 | |
531 | |
440 | icmphdr *hdr = (icmphdr *)&((*pkt)[IP_OVERHEAD]); |
532 | icmp_header *hdr = (icmp_header *)&((*pkt)[IP_OVERHEAD]); |
441 | |
533 | |
442 | if (hdr->type == ::conf.icmp_type |
534 | if (hdr->type == ::conf.icmp_type |
443 | && hdr->code == 255) |
535 | && hdr->code == 255) |
444 | { |
536 | { |
445 | // raw sockets deliver the ipv4, but don't expect it on sends |
537 | // raw sockets deliver the ipv4, but don't expect it on sends |
… | |
… | |
455 | slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno)); |
547 | slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno)); |
456 | } |
548 | } |
457 | |
549 | |
458 | delete pkt; |
550 | delete pkt; |
459 | } |
551 | } |
460 | else if (revents & POLLHUP) |
|
|
461 | { |
|
|
462 | // this cannot ;) happen on udp sockets |
|
|
463 | slog (L_ERR, _("FATAL: POLLHUP on icmpv4 fd, terminating.")); |
|
|
464 | exit (1); |
|
|
465 | } |
|
|
466 | else |
552 | else |
467 | { |
553 | { |
468 | slog (L_ERR, |
554 | slog (L_ERR, |
469 | _("FATAL: unknown revents %08x in socket, terminating\n"), |
555 | _("FATAL: unknown revents %08x in socket, terminating\n"), |
470 | revents); |
556 | revents); |
471 | exit (1); |
557 | exit (EXIT_FAILURE); |
472 | } |
558 | } |
473 | } |
559 | } |
474 | #endif |
560 | #endif |
475 | |
561 | |
476 | void |
562 | void |
477 | vpn::udpv4_ev (io_watcher &w, short revents) |
563 | vpn::udpv4_ev (io_watcher &w, short revents) |
478 | { |
564 | { |
479 | if (revents & (POLLIN | POLLERR)) |
565 | if (revents & EVENT_READ) |
480 | { |
566 | { |
481 | vpn_packet *pkt = new vpn_packet; |
567 | vpn_packet *pkt = new vpn_packet; |
482 | struct sockaddr_in sa; |
568 | struct sockaddr_in sa; |
483 | socklen_t sa_len = sizeof (sa); |
569 | socklen_t sa_len = sizeof (sa); |
484 | int len; |
570 | int len; |
… | |
… | |
499 | slog (L_DEBUG, _("%s: fd %d, %s"), (const char *)si, w.fd, strerror (errno)); |
585 | slog (L_DEBUG, _("%s: fd %d, %s"), (const char *)si, w.fd, strerror (errno)); |
500 | } |
586 | } |
501 | |
587 | |
502 | delete pkt; |
588 | delete pkt; |
503 | } |
589 | } |
504 | else if (revents & POLLHUP) |
|
|
505 | { |
|
|
506 | // this cannot ;) happen on udp sockets |
|
|
507 | slog (L_ERR, _("FATAL: POLLHUP on udp v4 fd, terminating.")); |
|
|
508 | exit (1); |
|
|
509 | } |
|
|
510 | else |
590 | else |
511 | { |
591 | { |
512 | slog (L_ERR, |
592 | slog (L_ERR, |
513 | _("FATAL: unknown revents %08x in socket, terminating\n"), |
593 | _("FATAL: unknown revents %08x in socket, terminating\n"), |
514 | revents); |
594 | revents); |
515 | exit (1); |
595 | exit (EXIT_FAILURE); |
516 | } |
596 | } |
517 | } |
597 | } |
518 | |
598 | |
519 | void |
599 | void |
520 | vpn::tap_ev (io_watcher &w, short revents) |
600 | vpn::tap_ev (io_watcher &w, short revents) |
521 | { |
601 | { |
522 | if (revents & POLLIN) |
602 | if (revents & EVENT_READ) |
523 | { |
603 | { |
524 | /* process data */ |
604 | /* process data */ |
525 | tap_packet *pkt; |
605 | tap_packet *pkt; |
526 | |
606 | |
527 | pkt = tap->recv (); |
607 | pkt = tap->recv (); |
528 | |
608 | |
|
|
609 | if (!pkt) |
|
|
610 | return; |
|
|
611 | |
|
|
612 | if (pkt->len > 14) |
|
|
613 | { |
529 | int dst = mac2id (pkt->dst); |
614 | int dst = mac2id (pkt->dst); |
530 | int src = mac2id (pkt->src); |
615 | int src = mac2id (pkt->src); |
531 | |
616 | |
532 | if (src != THISNODE->id) |
617 | if (src != THISNODE->id) |
533 | { |
|
|
534 | slog (L_ERR, _("FATAL: tap packet not originating on current node received, terminating.")); |
|
|
535 | exit (1); |
|
|
536 | } |
|
|
537 | |
|
|
538 | if (dst == THISNODE->id) |
|
|
539 | { |
|
|
540 | slog (L_ERR, _("FATAL: tap packet destined for current node received, terminating.")); |
|
|
541 | exit (1); |
|
|
542 | } |
|
|
543 | |
|
|
544 | if (dst > conns.size ()) |
|
|
545 | slog (L_ERR, _("tap packet for unknown node %d received, ignoring."), dst); |
|
|
546 | else |
|
|
547 | { |
|
|
548 | if (dst) |
|
|
549 | { |
618 | { |
550 | // unicast |
619 | slog (L_ERR, _("FATAL: tap packet not originating on current node received (if-up script not working properly?), exiting.")); |
551 | if (dst != THISNODE->id) |
620 | exit (EXIT_FAILURE); |
552 | conns[dst - 1]->inject_data_packet (pkt); |
|
|
553 | } |
621 | } |
|
|
622 | |
|
|
623 | if (dst == THISNODE->id) |
|
|
624 | { |
|
|
625 | slog (L_ERR, _("FATAL: tap packet destined for current node received, exiting.")); |
|
|
626 | exit (EXIT_FAILURE); |
|
|
627 | } |
|
|
628 | |
|
|
629 | if (dst > conns.size ()) |
|
|
630 | slog (L_ERR, _("tap packet for unknown node %d received, ignoring."), dst); |
554 | else |
631 | else |
555 | { |
|
|
556 | // broadcast, this is ugly, but due to the security policy |
|
|
557 | // we have to connect to all hosts... |
|
|
558 | for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c) |
|
|
559 | if ((*c)->conf != THISNODE) |
|
|
560 | (*c)->inject_data_packet (pkt); |
632 | inject_data_packet (pkt, dst); |
561 | } |
|
|
562 | } |
633 | } |
563 | |
634 | |
564 | delete pkt; |
635 | 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 | } |
636 | } |
571 | else |
637 | else |
572 | abort (); |
638 | abort (); |
573 | } |
639 | } |
574 | |
640 | |
… | |
… | |
580 | if (events & EVENT_SHUTDOWN) |
646 | if (events & EVENT_SHUTDOWN) |
581 | { |
647 | { |
582 | slog (L_INFO, _("preparing shutdown...")); |
648 | slog (L_INFO, _("preparing shutdown...")); |
583 | |
649 | |
584 | shutdown_all (); |
650 | shutdown_all (); |
585 | |
|
|
586 | remove_pid (pidfilename); |
651 | remove_pid (conf.pidfilename); |
587 | |
|
|
588 | slog (L_INFO, _("terminating")); |
652 | slog (L_INFO, _("terminating")); |
589 | |
653 | exit (EXIT_SUCCESS); |
590 | exit (0); |
|
|
591 | } |
654 | } |
592 | |
655 | |
593 | if (events & EVENT_RECONNECT) |
656 | if (events & EVENT_RECONNECT) |
594 | { |
657 | { |
595 | slog (L_INFO, _("forced reconnect")); |
658 | slog (L_INFO, _("forced reconnect")); |
… | |
… | |
597 | reconnect_all (); |
660 | reconnect_all (); |
598 | } |
661 | } |
599 | |
662 | |
600 | events = 0; |
663 | events = 0; |
601 | } |
664 | } |
602 | |
|
|
603 | w.at = TSTAMP_CANCEL; |
|
|
604 | } |
665 | } |
605 | |
666 | |
606 | void |
667 | void |
607 | vpn::shutdown_all () |
668 | vpn::shutdown_all () |
608 | { |
669 | { |
… | |
… | |
621 | connection_init (); |
682 | connection_init (); |
622 | |
683 | |
623 | for (configuration::node_vector::iterator i = conf.nodes.begin (); |
684 | for (configuration::node_vector::iterator i = conf.nodes.begin (); |
624 | i != conf.nodes.end (); ++i) |
685 | i != conf.nodes.end (); ++i) |
625 | { |
686 | { |
626 | connection *conn = new connection (this); |
687 | connection *conn = new connection (this, *i); |
627 | |
|
|
628 | conn->conf = *i; |
|
|
629 | conns.push_back (conn); |
688 | conns.push_back (conn); |
630 | |
|
|
631 | conn->establish_connection (); |
689 | conn->establish_connection (); |
632 | } |
690 | } |
633 | } |
691 | } |
634 | |
692 | |
635 | connection *vpn::find_router () |
693 | connection *vpn::find_router () |
… | |
… | |
698 | , tcpv4_ev_watcher (this, &vpn::tcpv4_ev) |
756 | , tcpv4_ev_watcher (this, &vpn::tcpv4_ev) |
699 | #endif |
757 | #endif |
700 | #if ENABLE_ICMP |
758 | #if ENABLE_ICMP |
701 | , icmpv4_ev_watcher(this, &vpn::icmpv4_ev) |
759 | , icmpv4_ev_watcher(this, &vpn::icmpv4_ev) |
702 | #endif |
760 | #endif |
|
|
761 | #if ENABLE_DNS |
|
|
762 | , dnsv4_ev_watcher (this, &vpn::dnsv4_ev) |
|
|
763 | #endif |
703 | , tap_ev_watcher (this, &vpn::tap_ev) |
764 | , tap_ev_watcher (this, &vpn::tap_ev) |
704 | { |
765 | { |
705 | } |
766 | } |
706 | |
767 | |
707 | vpn::~vpn () |
768 | vpn::~vpn () |