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); |
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60 | putenv (env); |
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61 | asprintf (&env, "NODEID=%d", THISNODE->id); |
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62 | putenv (env); |
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63 | asprintf (&env, "IFNAME=%s", tap->interface ()); |
63 | asprintf (&env, "IFNAME=%s", tap->interface ()); putenv (env); |
64 | putenv (env); |
64 | asprintf (&env, "IFTYPE=%s", IFTYPE); putenv (env); |
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65 | asprintf (&env, "IFSUBTYPE=%s", IFSUBTYPE); putenv (env); |
65 | asprintf (&env, "MTU=%d", mtu); |
66 | asprintf (&env, "MTU=%d", mtu); putenv (env); |
66 | putenv (env); |
67 | asprintf (&env, "NODES=%d", conns.size ()); putenv (env); |
67 | asprintf (&env, "MAC=%02x:%02x:%02x:%02x:%02x:%02x", |
68 | asprintf (&env, "NODEID=%d", THISNODE->id); putenv (env); |
68 | 0xfe, 0xfd, 0x80, 0x00, THISNODE->id >> 8, |
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69 | THISNODE->id & 0xff); |
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70 | putenv (env); |
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71 | |
69 | |
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70 | conns [THISNODE->id - 1]->script_init_env (""); |
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71 | |
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72 | for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c) |
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73 | { |
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74 | char ext[16]; |
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75 | snprintf (ext, 16, "_%d", (*c)->conf->id); |
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76 | (*c)->script_init_env (ext); |
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77 | } |
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78 | } |
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79 | |
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80 | const char *vpn::script_if_init () |
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81 | { |
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82 | script_init_env (); |
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83 | |
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84 | return tap->if_up (); |
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85 | } |
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86 | |
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87 | const char *vpn::script_if_up () |
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88 | { |
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89 | script_init_env (); |
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90 | |
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91 | char *filename; |
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92 | asprintf (&filename, |
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93 | "%s/%s", |
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94 | confbase, |
72 | return ::conf.script_if_up ? ::conf.script_if_up : "if-up"; |
95 | ::conf.script_if_up ? ::conf.script_if_up : "if-up"); |
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96 | |
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97 | return filename; |
73 | } |
98 | } |
74 | |
99 | |
75 | int |
100 | int |
76 | vpn::setup () |
101 | vpn::setup () |
77 | { |
102 | { |
… | |
… | |
84 | if (ipv4_fd < 0) |
109 | if (ipv4_fd < 0) |
85 | return -1; |
110 | return -1; |
86 | |
111 | |
87 | fcntl (ipv4_fd, F_SETFL, O_NONBLOCK); |
112 | fcntl (ipv4_fd, F_SETFL, O_NONBLOCK); |
88 | |
113 | |
89 | #ifdef IP_MTU_DISCOVER |
114 | #if defined(SOL_IP) && defined(IP_MTU_DISCOVER) |
90 | // this I really consider a linux bug. I am neither connected |
115 | // this I really consider a linux bug. I am neither connected |
91 | // nor do I fragment myself. Linux still sets DF and doesn't |
116 | // nor do I fragment myself. Linux still sets DF and doesn't |
92 | // fragment for me sometimes. |
117 | // fragment for me sometimes. |
93 | { |
118 | { |
94 | int oval = IP_PMTUDISC_DONT; |
119 | int oval = IP_PMTUDISC_DONT; |
… | |
… | |
99 | sockinfo si (THISNODE, PROT_IPv4); |
124 | sockinfo si (THISNODE, PROT_IPv4); |
100 | |
125 | |
101 | if (bind (ipv4_fd, si.sav4 (), si.salenv4 ())) |
126 | if (bind (ipv4_fd, si.sav4 (), si.salenv4 ())) |
102 | { |
127 | { |
103 | slog (L_ERR, _("can't bind ipv4 socket on %s: %s"), (const char *)si, strerror (errno)); |
128 | slog (L_ERR, _("can't bind ipv4 socket on %s: %s"), (const char *)si, strerror (errno)); |
104 | exit (1); |
129 | exit (EXIT_FAILURE); |
105 | } |
130 | } |
106 | |
131 | |
107 | ipv4_ev_watcher.start (ipv4_fd, POLLIN); |
132 | ipv4_ev_watcher.start (ipv4_fd, EVENT_READ); |
108 | } |
133 | } |
109 | |
134 | |
110 | udpv4_fd = -1; |
135 | udpv4_fd = -1; |
111 | |
136 | |
112 | if (THISNODE->protocols & PROT_UDPv4 && THISNODE->udp_port) |
137 | if (THISNODE->protocols & PROT_UDPv4 && THISNODE->udp_port) |
… | |
… | |
122 | { |
147 | { |
123 | int oval = 1; |
148 | int oval = 1; |
124 | setsockopt (udpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval); |
149 | setsockopt (udpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval); |
125 | } |
150 | } |
126 | |
151 | |
127 | #ifdef IP_MTU_DISCOVER |
152 | #if defined(SOL_IP) && defined(IP_MTU_DISCOVER) |
128 | // this I really consider a linux bug. I am neither connected |
153 | // this I really consider a linux bug. I am neither connected |
129 | // nor do I fragment myself. Linux still sets DF and doesn't |
154 | // nor do I fragment myself. Linux still sets DF and doesn't |
130 | // fragment for me sometimes. |
155 | // fragment for me sometimes. |
131 | { |
156 | { |
132 | int oval = IP_PMTUDISC_DONT; |
157 | int oval = IP_PMTUDISC_DONT; |
… | |
… | |
137 | sockinfo si (THISNODE, PROT_UDPv4); |
162 | sockinfo si (THISNODE, PROT_UDPv4); |
138 | |
163 | |
139 | if (bind (udpv4_fd, si.sav4 (), si.salenv4 ())) |
164 | if (bind (udpv4_fd, si.sav4 (), si.salenv4 ())) |
140 | { |
165 | { |
141 | slog (L_ERR, _("can't bind udpv4 on %s: %s"), (const char *)si, strerror (errno)); |
166 | slog (L_ERR, _("can't bind udpv4 on %s: %s"), (const char *)si, strerror (errno)); |
142 | exit (1); |
167 | exit (EXIT_FAILURE); |
143 | } |
168 | } |
144 | |
169 | |
145 | udpv4_ev_watcher.start (udpv4_fd, POLLIN); |
170 | udpv4_ev_watcher.start (udpv4_fd, EVENT_READ); |
146 | } |
171 | } |
147 | |
172 | |
148 | icmpv4_fd = -1; |
173 | icmpv4_fd = -1; |
149 | |
174 | |
150 | #if ENABLE_ICMP |
175 | #if ENABLE_ICMP |
… | |
… | |
166 | |
191 | |
167 | setsockopt (icmpv4_fd, SOL_RAW, ICMP_FILTER, &oval, sizeof oval); |
192 | setsockopt (icmpv4_fd, SOL_RAW, ICMP_FILTER, &oval, sizeof oval); |
168 | } |
193 | } |
169 | #endif |
194 | #endif |
170 | |
195 | |
171 | #ifdef IP_MTU_DISCOVER |
196 | #if defined(SOL_IP) && defined(IP_MTU_DISCOVER) |
172 | // this I really consider a linux bug. I am neither connected |
197 | // this I really consider a linux bug. I am neither connected |
173 | // nor do I fragment myself. Linux still sets DF and doesn't |
198 | // nor do I fragment myself. Linux still sets DF and doesn't |
174 | // fragment for me sometimes. |
199 | // fragment for me sometimes. |
175 | { |
200 | { |
176 | int oval = IP_PMTUDISC_DONT; |
201 | int oval = IP_PMTUDISC_DONT; |
… | |
… | |
181 | sockinfo si (THISNODE, PROT_ICMPv4); |
206 | sockinfo si (THISNODE, PROT_ICMPv4); |
182 | |
207 | |
183 | if (bind (icmpv4_fd, si.sav4 (), si.salenv4 ())) |
208 | if (bind (icmpv4_fd, si.sav4 (), si.salenv4 ())) |
184 | { |
209 | { |
185 | slog (L_ERR, _("can't bind icmpv4 on %s: %s"), (const char *)si, strerror (errno)); |
210 | slog (L_ERR, _("can't bind icmpv4 on %s: %s"), (const char *)si, strerror (errno)); |
186 | exit (1); |
211 | exit (EXIT_FAILURE); |
187 | } |
212 | } |
188 | |
213 | |
189 | icmpv4_ev_watcher.start (icmpv4_fd, POLLIN); |
214 | icmpv4_ev_watcher.start (icmpv4_fd, EVENT_READ); |
190 | } |
215 | } |
191 | #endif |
216 | #endif |
192 | |
217 | |
193 | tcpv4_fd = -1; |
218 | tcpv4_fd = -1; |
194 | |
219 | |
… | |
… | |
211 | sockinfo si (THISNODE, PROT_TCPv4); |
236 | sockinfo si (THISNODE, PROT_TCPv4); |
212 | |
237 | |
213 | if (bind (tcpv4_fd, si.sav4 (), si.salenv4 ())) |
238 | if (bind (tcpv4_fd, si.sav4 (), si.salenv4 ())) |
214 | { |
239 | { |
215 | slog (L_ERR, _("can't bind tcpv4 on %s: %s"), (const char *)si, strerror (errno)); |
240 | slog (L_ERR, _("can't bind tcpv4 on %s: %s"), (const char *)si, strerror (errno)); |
216 | exit (1); |
241 | exit (EXIT_FAILURE); |
217 | } |
242 | } |
218 | |
243 | |
219 | if (listen (tcpv4_fd, 5)) |
244 | if (listen (tcpv4_fd, 5)) |
220 | { |
245 | { |
221 | slog (L_ERR, _("can't listen tcpv4 on %s: %s"), (const char *)si, strerror (errno)); |
246 | slog (L_ERR, _("can't listen tcpv4 on %s: %s"), (const char *)si, strerror (errno)); |
222 | exit (1); |
247 | exit (EXIT_FAILURE); |
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248 | } |
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249 | |
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250 | tcpv4_ev_watcher.start (tcpv4_fd, EVENT_READ); |
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251 | } |
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252 | #endif |
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253 | |
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254 | #if ENABLE_DNS |
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255 | if (THISNODE->protocols & PROT_DNSv4) |
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256 | { |
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257 | dns_forwarder.set (::conf.dns_forw_host, ::conf.dns_forw_port, PROT_DNSv4); |
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258 | |
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259 | dnsv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP); |
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260 | |
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261 | if (dnsv4_fd < 0) |
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262 | return -1; |
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263 | |
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264 | #if defined(SOL_IP) && defined(IP_MTU_DISCOVER) |
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265 | // this I really consider a linux bug. I am neither connected |
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266 | // nor do I fragment myself. Linux still sets DF and doesn't |
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267 | // fragment for me sometimes. |
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268 | { |
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269 | int oval = IP_PMTUDISC_DONT; |
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270 | setsockopt (udpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval); |
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271 | } |
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272 | #endif |
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273 | |
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274 | // standard daemon practise... |
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275 | { |
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276 | int oval = 1; |
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277 | setsockopt (dnsv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval); |
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278 | } |
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279 | |
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280 | sockinfo si (THISNODE->dns_hostname, |
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281 | THISNODE->dns_hostname ? THISNODE->dns_port : 0, |
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282 | PROT_DNSv4); |
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283 | |
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284 | if (bind (dnsv4_fd, si.sav4 (), si.salenv4 ())) |
223 | } |
285 | { |
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286 | slog (L_ERR, _("can't bind dnsv4 on %s: %s"), (const char *)si, strerror (errno)); |
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287 | exit (EXIT_FAILURE); |
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288 | } |
224 | |
289 | |
225 | tcpv4_ev_watcher.start (tcpv4_fd, POLLIN); |
290 | dnsv4_ev_watcher.start (dnsv4_fd, EVENT_READ); |
226 | } |
291 | } |
227 | #endif |
292 | #endif |
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293 | |
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294 | ///////////////////////////////////////////////////////////////////////////// |
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295 | |
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296 | reconnect_all (); |
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297 | |
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298 | ///////////////////////////////////////////////////////////////////////////// |
228 | |
299 | |
229 | tap = new tap_device (); |
300 | tap = new tap_device (); |
230 | if (!tap) //D this, of course, never catches |
301 | if (!tap) //D this, of course, never catches |
231 | { |
302 | { |
232 | slog (L_ERR, _("cannot create network interface '%s'"), conf.ifname); |
303 | slog (L_ERR, _("cannot create network interface '%s'"), conf.ifname); |
233 | exit (1); |
304 | exit (EXIT_FAILURE); |
234 | } |
305 | } |
235 | |
306 | |
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307 | if (tap->if_up () && |
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308 | !run_script (run_script_cb (this, &vpn::script_if_init), true)) |
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309 | { |
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310 | slog (L_ERR, _("interface initialization command '%s' failed, exiting."), |
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311 | tap->if_up ()); |
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312 | exit (EXIT_FAILURE); |
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313 | } |
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314 | |
236 | run_script (run_script_cb (this, &vpn::script_if_up), true); |
315 | if (!run_script (run_script_cb (this, &vpn::script_if_up), true)) |
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316 | { |
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317 | slog (L_ERR, _("if-up command execution failed, exiting.")); |
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318 | exit (EXIT_FAILURE); |
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319 | } |
237 | |
320 | |
238 | tap_ev_watcher.start (tap->fd, POLLIN); |
321 | tap_ev_watcher.start (tap->fd, EVENT_READ); |
239 | |
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240 | reconnect_all (); |
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241 | |
322 | |
242 | return 0; |
323 | 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 | } |
324 | } |
272 | |
325 | |
273 | bool |
326 | bool |
274 | vpn::send_ipv4_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
327 | vpn::send_ipv4_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
275 | { |
328 | { |
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329 | #if defined(SOL_IP) && defined(IP_TOS) |
276 | setsockopt (ipv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos); |
330 | setsockopt (ipv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos); |
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331 | #endif |
277 | sendto (ipv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ()); |
332 | sendto (ipv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ()); |
278 | |
333 | |
279 | return true; |
334 | return true; |
280 | } |
335 | } |
281 | |
336 | |
… | |
… | |
304 | |
359 | |
305 | #if ENABLE_ICMP |
360 | #if ENABLE_ICMP |
306 | bool |
361 | bool |
307 | vpn::send_icmpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
362 | vpn::send_icmpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
308 | { |
363 | { |
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364 | #if defined(SOL_IP) && defined(IP_TOS) |
309 | setsockopt (icmpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos); |
365 | setsockopt (icmpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos); |
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366 | #endif |
310 | |
367 | |
311 | pkt->unshift_hdr (4); |
368 | pkt->unshift_hdr (4); |
312 | |
369 | |
313 | icmphdr *hdr = (icmphdr *)&((*pkt)[0]); |
370 | icmp_header *hdr = (icmp_header *)&((*pkt)[0]); |
314 | hdr->type = ::conf.icmp_type; |
371 | hdr->type = ::conf.icmp_type; |
315 | hdr->code = 255; |
372 | hdr->code = 255; |
316 | hdr->checksum = 0; |
373 | hdr->checksum = 0; |
317 | hdr->checksum = ipv4_checksum ((u16 *)hdr, pkt->len); |
374 | hdr->checksum = ipv4_checksum ((u16 *)hdr, pkt->len); |
318 | |
375 | |
… | |
… | |
323 | #endif |
380 | #endif |
324 | |
381 | |
325 | bool |
382 | bool |
326 | vpn::send_udpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
383 | vpn::send_udpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
327 | { |
384 | { |
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|
385 | #if defined(SOL_IP) && defined(IP_TOS) |
328 | setsockopt (udpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos); |
386 | setsockopt (udpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos); |
|
|
387 | #endif |
329 | sendto (udpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ()); |
388 | sendto (udpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ()); |
330 | |
389 | |
331 | return true; |
390 | return true; |
|
|
391 | } |
|
|
392 | |
|
|
393 | void |
|
|
394 | vpn::inject_data_packet (tap_packet *pkt, int dst) |
|
|
395 | { |
|
|
396 | if (dst) |
|
|
397 | { |
|
|
398 | // unicast |
|
|
399 | if (dst != THISNODE->id) |
|
|
400 | conns[dst - 1]->inject_data_packet (pkt); |
|
|
401 | } |
|
|
402 | else |
|
|
403 | { |
|
|
404 | // broadcast, this is ugly, but due to the security policy |
|
|
405 | // we have to connect to all hosts... |
|
|
406 | for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c) |
|
|
407 | if ((*c)->conf != THISNODE) |
|
|
408 | (*c)->inject_data_packet (pkt, true); |
|
|
409 | } |
332 | } |
410 | } |
333 | |
411 | |
334 | void |
412 | void |
335 | vpn::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi) |
413 | vpn::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi) |
336 | { |
414 | { |
… | |
… | |
353 | connection *c = conns[src - 1]; |
431 | connection *c = conns[src - 1]; |
354 | |
432 | |
355 | if (dst == 0) |
433 | if (dst == 0) |
356 | slog (L_WARN, _("%s(%s): received broadcast (protocol violation)"), |
434 | slog (L_WARN, _("%s(%s): received broadcast (protocol violation)"), |
357 | c->conf->nodename, (const char *)rsi); |
435 | c->conf->nodename, (const char *)rsi); |
358 | else if (dst != 0 && dst != THISNODE->id) |
436 | else if (dst != THISNODE->id) |
359 | { |
437 | { |
360 | if (THISNODE->routerprio) |
438 | if (THISNODE->routerprio) |
361 | // the tos setting gets lost here. who cares. |
439 | // the tos setting gets lost here. who cares. |
362 | conns[dst - 1]->inject_vpn_packet (pkt); |
440 | conns[dst - 1]->inject_vpn_packet (pkt); |
363 | else |
441 | else |
… | |
… | |
369 | else |
447 | else |
370 | c->recv_vpn_packet (pkt, rsi); |
448 | c->recv_vpn_packet (pkt, rsi); |
371 | } |
449 | } |
372 | } |
450 | } |
373 | |
451 | |
|
|
452 | bool |
|
|
453 | vpn::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
|
|
454 | { |
|
|
455 | switch (si.prot) |
|
|
456 | { |
|
|
457 | case PROT_IPv4: |
|
|
458 | return send_ipv4_packet (pkt, si, tos); |
|
|
459 | case PROT_UDPv4: |
|
|
460 | return send_udpv4_packet (pkt, si, tos); |
|
|
461 | #if ENABLE_TCP |
|
|
462 | case PROT_TCPv4: |
|
|
463 | return send_tcpv4_packet (pkt, si, tos); |
|
|
464 | #endif |
|
|
465 | #if ENABLE_ICMP |
|
|
466 | case PROT_ICMPv4: |
|
|
467 | return send_icmpv4_packet (pkt, si, tos); |
|
|
468 | #endif |
|
|
469 | #if ENABLE_DNS |
|
|
470 | case PROT_DNSv4: |
|
|
471 | return send_dnsv4_packet (pkt, si, tos); |
|
|
472 | #endif |
|
|
473 | |
|
|
474 | default: |
|
|
475 | slog (L_CRIT, _("%s: FATAL: trying to send packet with unsupported protocol"), (const char *)si); |
|
|
476 | } |
|
|
477 | |
|
|
478 | return false; |
|
|
479 | } |
|
|
480 | |
374 | void |
481 | void |
375 | vpn::ipv4_ev (io_watcher &w, short revents) |
482 | vpn::ipv4_ev (io_watcher &w, short revents) |
376 | { |
483 | { |
377 | if (revents & (POLLIN | POLLERR)) |
484 | if (revents & EVENT_READ) |
378 | { |
485 | { |
379 | vpn_packet *pkt = new vpn_packet; |
486 | vpn_packet *pkt = new vpn_packet; |
380 | struct sockaddr_in sa; |
487 | struct sockaddr_in sa; |
381 | socklen_t sa_len = sizeof (sa); |
488 | socklen_t sa_len = sizeof (sa); |
382 | int len; |
489 | int len; |
… | |
… | |
387 | |
494 | |
388 | if (len > 0) |
495 | if (len > 0) |
389 | { |
496 | { |
390 | pkt->len = len; |
497 | pkt->len = len; |
391 | |
498 | |
392 | // raw sockets deliver the ipv4, but don't expect it on sends |
499 | // raw sockets deliver the ipv4 header, but don't expect it on sends |
393 | // this is slow, but... |
|
|
394 | pkt->skip_hdr (IP_OVERHEAD); |
500 | pkt->skip_hdr (IP_OVERHEAD); |
395 | |
501 | |
396 | recv_vpn_packet (pkt, si); |
502 | recv_vpn_packet (pkt, si); |
397 | } |
503 | } |
398 | else |
504 | else |
… | |
… | |
401 | slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno)); |
507 | slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno)); |
402 | } |
508 | } |
403 | |
509 | |
404 | delete pkt; |
510 | delete pkt; |
405 | } |
511 | } |
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 |
512 | else |
413 | { |
513 | { |
414 | slog (L_ERR, |
514 | slog (L_ERR, |
415 | _("FATAL: unknown revents %08x in socket, terminating\n"), |
515 | _("FATAL: unknown revents %08x in socket, terminating\n"), |
416 | revents); |
516 | revents); |
417 | exit (1); |
517 | exit (EXIT_FAILURE); |
418 | } |
518 | } |
419 | } |
519 | } |
420 | |
520 | |
421 | #if ENABLE_ICMP |
521 | #if ENABLE_ICMP |
422 | void |
522 | void |
423 | vpn::icmpv4_ev (io_watcher &w, short revents) |
523 | vpn::icmpv4_ev (io_watcher &w, short revents) |
424 | { |
524 | { |
425 | if (revents & (POLLIN | POLLERR)) |
525 | if (revents & EVENT_READ) |
426 | { |
526 | { |
427 | vpn_packet *pkt = new vpn_packet; |
527 | vpn_packet *pkt = new vpn_packet; |
428 | struct sockaddr_in sa; |
528 | struct sockaddr_in sa; |
429 | socklen_t sa_len = sizeof (sa); |
529 | socklen_t sa_len = sizeof (sa); |
430 | int len; |
530 | int len; |
… | |
… | |
435 | |
535 | |
436 | if (len > 0) |
536 | if (len > 0) |
437 | { |
537 | { |
438 | pkt->len = len; |
538 | pkt->len = len; |
439 | |
539 | |
440 | icmphdr *hdr = (icmphdr *)&((*pkt)[IP_OVERHEAD]); |
540 | icmp_header *hdr = (icmp_header *)&((*pkt)[IP_OVERHEAD]); |
441 | |
541 | |
442 | if (hdr->type == ::conf.icmp_type |
542 | if (hdr->type == ::conf.icmp_type |
443 | && hdr->code == 255) |
543 | && hdr->code == 255) |
444 | { |
544 | { |
445 | // raw sockets deliver the ipv4, but don't expect it on sends |
545 | // raw sockets deliver the ipv4, but don't expect it on sends |
… | |
… | |
455 | slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno)); |
555 | slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno)); |
456 | } |
556 | } |
457 | |
557 | |
458 | delete pkt; |
558 | delete pkt; |
459 | } |
559 | } |
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 |
560 | else |
467 | { |
561 | { |
468 | slog (L_ERR, |
562 | slog (L_ERR, |
469 | _("FATAL: unknown revents %08x in socket, terminating\n"), |
563 | _("FATAL: unknown revents %08x in socket, terminating\n"), |
470 | revents); |
564 | revents); |
471 | exit (1); |
565 | exit (EXIT_FAILURE); |
472 | } |
566 | } |
473 | } |
567 | } |
474 | #endif |
568 | #endif |
475 | |
569 | |
476 | void |
570 | void |
477 | vpn::udpv4_ev (io_watcher &w, short revents) |
571 | vpn::udpv4_ev (io_watcher &w, short revents) |
478 | { |
572 | { |
479 | if (revents & (POLLIN | POLLERR)) |
573 | if (revents & EVENT_READ) |
480 | { |
574 | { |
481 | vpn_packet *pkt = new vpn_packet; |
575 | vpn_packet *pkt = new vpn_packet; |
482 | struct sockaddr_in sa; |
576 | struct sockaddr_in sa; |
483 | socklen_t sa_len = sizeof (sa); |
577 | socklen_t sa_len = sizeof (sa); |
484 | int len; |
578 | int len; |
… | |
… | |
499 | slog (L_DEBUG, _("%s: fd %d, %s"), (const char *)si, w.fd, strerror (errno)); |
593 | slog (L_DEBUG, _("%s: fd %d, %s"), (const char *)si, w.fd, strerror (errno)); |
500 | } |
594 | } |
501 | |
595 | |
502 | delete pkt; |
596 | delete pkt; |
503 | } |
597 | } |
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 |
598 | else |
511 | { |
599 | { |
512 | slog (L_ERR, |
600 | slog (L_ERR, |
513 | _("FATAL: unknown revents %08x in socket, terminating\n"), |
601 | _("FATAL: unknown revents %08x in socket, terminating\n"), |
514 | revents); |
602 | revents); |
515 | exit (1); |
603 | exit (EXIT_FAILURE); |
516 | } |
604 | } |
517 | } |
605 | } |
518 | |
606 | |
519 | void |
607 | void |
520 | vpn::tap_ev (io_watcher &w, short revents) |
608 | vpn::tap_ev (io_watcher &w, short revents) |
521 | { |
609 | { |
522 | if (revents & POLLIN) |
610 | if (revents & EVENT_READ) |
523 | { |
611 | { |
524 | /* process data */ |
612 | /* process data */ |
525 | tap_packet *pkt; |
613 | tap_packet *pkt; |
526 | |
614 | |
527 | pkt = tap->recv (); |
615 | pkt = tap->recv (); |
528 | |
616 | |
|
|
617 | if (!pkt) |
|
|
618 | return; |
|
|
619 | |
|
|
620 | if (pkt->len > 14) |
|
|
621 | { |
529 | int dst = mac2id (pkt->dst); |
622 | int dst = mac2id (pkt->dst); |
530 | int src = mac2id (pkt->src); |
623 | int src = mac2id (pkt->src); |
531 | |
624 | |
532 | if (src != THISNODE->id) |
625 | 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 | { |
626 | { |
550 | // unicast |
627 | slog (L_ERR, _("FATAL: tap packet not originating on current node received (if-up script not working properly?), exiting.")); |
551 | if (dst != THISNODE->id) |
628 | exit (EXIT_FAILURE); |
552 | conns[dst - 1]->inject_data_packet (pkt); |
|
|
553 | } |
629 | } |
|
|
630 | |
|
|
631 | if (dst == THISNODE->id) |
|
|
632 | { |
|
|
633 | slog (L_ERR, _("FATAL: tap packet destined for current node received, exiting.")); |
|
|
634 | exit (EXIT_FAILURE); |
|
|
635 | } |
|
|
636 | |
|
|
637 | if (dst > conns.size ()) |
|
|
638 | slog (L_ERR, _("tap packet for unknown node %d received, ignoring."), dst); |
554 | else |
639 | 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); |
640 | inject_data_packet (pkt, dst); |
561 | } |
|
|
562 | } |
641 | } |
563 | |
642 | |
564 | delete pkt; |
643 | 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 | } |
644 | } |
571 | else |
645 | else |
572 | abort (); |
646 | abort (); |
573 | } |
647 | } |
574 | |
648 | |
… | |
… | |
580 | if (events & EVENT_SHUTDOWN) |
654 | if (events & EVENT_SHUTDOWN) |
581 | { |
655 | { |
582 | slog (L_INFO, _("preparing shutdown...")); |
656 | slog (L_INFO, _("preparing shutdown...")); |
583 | |
657 | |
584 | shutdown_all (); |
658 | shutdown_all (); |
585 | |
|
|
586 | remove_pid (pidfilename); |
659 | remove_pid (conf.pidfilename); |
587 | |
|
|
588 | slog (L_INFO, _("terminating")); |
660 | slog (L_INFO, _("terminating")); |
589 | |
661 | exit (EXIT_SUCCESS); |
590 | exit (0); |
|
|
591 | } |
662 | } |
592 | |
663 | |
593 | if (events & EVENT_RECONNECT) |
664 | if (events & EVENT_RECONNECT) |
594 | { |
665 | { |
595 | slog (L_INFO, _("forced reconnect")); |
666 | slog (L_INFO, _("forced reconnect")); |
… | |
… | |
597 | reconnect_all (); |
668 | reconnect_all (); |
598 | } |
669 | } |
599 | |
670 | |
600 | events = 0; |
671 | events = 0; |
601 | } |
672 | } |
602 | |
|
|
603 | w.at = TSTAMP_CANCEL; |
|
|
604 | } |
673 | } |
605 | |
674 | |
606 | void |
675 | void |
607 | vpn::shutdown_all () |
676 | vpn::shutdown_all () |
608 | { |
677 | { |
… | |
… | |
621 | connection_init (); |
690 | connection_init (); |
622 | |
691 | |
623 | for (configuration::node_vector::iterator i = conf.nodes.begin (); |
692 | for (configuration::node_vector::iterator i = conf.nodes.begin (); |
624 | i != conf.nodes.end (); ++i) |
693 | i != conf.nodes.end (); ++i) |
625 | { |
694 | { |
626 | connection *conn = new connection (this); |
695 | connection *conn = new connection (this, *i); |
627 | |
|
|
628 | conn->conf = *i; |
|
|
629 | conns.push_back (conn); |
696 | conns.push_back (conn); |
630 | |
|
|
631 | conn->establish_connection (); |
697 | conn->establish_connection (); |
632 | } |
698 | } |
633 | } |
699 | } |
634 | |
700 | |
635 | connection *vpn::find_router () |
701 | connection *vpn::find_router () |
… | |
… | |
698 | , tcpv4_ev_watcher (this, &vpn::tcpv4_ev) |
764 | , tcpv4_ev_watcher (this, &vpn::tcpv4_ev) |
699 | #endif |
765 | #endif |
700 | #if ENABLE_ICMP |
766 | #if ENABLE_ICMP |
701 | , icmpv4_ev_watcher(this, &vpn::icmpv4_ev) |
767 | , icmpv4_ev_watcher(this, &vpn::icmpv4_ev) |
702 | #endif |
768 | #endif |
|
|
769 | #if ENABLE_DNS |
|
|
770 | , dnsv4_ev_watcher (this, &vpn::dnsv4_ev) |
|
|
771 | #endif |
703 | , tap_ev_watcher (this, &vpn::tap_ev) |
772 | , tap_ev_watcher (this, &vpn::tap_ev) |
704 | { |
773 | { |
705 | } |
774 | } |
706 | |
775 | |
707 | vpn::~vpn () |
776 | vpn::~vpn () |