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. 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
17 | */ |
20 | */ |
18 | |
21 | |
19 | #include "config.h" |
22 | #include "config.h" |
20 | |
23 | |
21 | #include <list> |
24 | #include <list> |
22 | |
25 | |
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26 | #include <cstdio> |
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27 | #include <cstring> |
23 | #include <cstdlib> |
28 | #include <cstdlib> |
24 | #include <cstring> |
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25 | #include <cstdio> |
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26 | |
29 | |
27 | #include <sys/types.h> |
30 | #include <sys/types.h> |
28 | #include <sys/socket.h> |
31 | #include <sys/socket.h> |
29 | #include <sys/poll.h> |
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30 | #include <sys/wait.h> |
32 | #include <sys/wait.h> |
31 | #include <errno.h> |
33 | #include <errno.h> |
32 | #include <time.h> |
34 | #include <time.h> |
33 | #include <unistd.h> |
35 | #include <unistd.h> |
34 | #include <fcntl.h> |
36 | #include <fcntl.h> |
35 | #include <sys/socket.h> |
37 | #include <sys/socket.h> |
36 | #include <netinet/in.h> |
38 | |
37 | #include <arpa/inet.h> |
39 | #include "netcompat.h" |
38 | #include <net/if.h> |
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39 | #ifdef HAVE_NETINET_IN_SYSTM_H |
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40 | # include <netinet/in_systm.h> |
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41 | #endif |
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42 | #ifdef HAVE_NETINET_IP_H |
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43 | # include <netinet/ip.h> |
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44 | #endif |
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45 | #ifdef HAVE_NETINET_TCP_H |
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46 | # include <netinet/tcp.h> |
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47 | #endif |
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48 | #if ENABLE_ICMP |
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49 | # include <netinet/ip_icmp.h> |
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50 | #endif |
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51 | |
40 | |
52 | #include "pidfile.h" |
41 | #include "pidfile.h" |
53 | |
42 | |
54 | #include "connection.h" |
43 | #include "connection.h" |
55 | #include "util.h" |
44 | #include "util.h" |
56 | #include "vpn.h" |
45 | #include "vpn.h" |
57 | |
46 | |
58 | #if !defined(SOL_IP) && defined(IPPROTO_IP) |
47 | vpn network; // THE vpn (bad design...) |
59 | # define SOL_IP IPPROTO_IP |
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60 | #endif |
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61 | |
48 | |
62 | ///////////////////////////////////////////////////////////////////////////// |
49 | ///////////////////////////////////////////////////////////////////////////// |
63 | |
50 | |
64 | const char *vpn::script_if_up () |
51 | void |
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52 | vpn::script_init_env () |
65 | { |
53 | { |
66 | // the tunnel device mtu should be the physical mtu - overhead |
54 | // the tunnel device mtu should be the physical mtu - overhead |
67 | // the tricky part is rounding to the cipher key blocksize |
55 | // the tricky part is rounding to the cipher key blocksize |
68 | int mtu = conf.mtu - ETH_OVERHEAD - VPE_OVERHEAD - MAX_OVERHEAD; |
56 | int mtu = conf.mtu - ETH_OVERHEAD - VPE_OVERHEAD - MAX_OVERHEAD; |
69 | mtu += ETH_OVERHEAD - 6 - 6; // now we have the data portion |
57 | mtu += ETH_OVERHEAD - 6 - 6; // now we have the data portion |
70 | mtu -= mtu % EVP_CIPHER_block_size (CIPHER); // round |
58 | mtu -= mtu % EVP_CIPHER_block_size (CIPHER); // round |
71 | mtu -= ETH_OVERHEAD - 6 - 6; // and get interface mtu again |
59 | mtu -= ETH_OVERHEAD - 6 - 6; // and get interface mtu again |
72 | |
60 | |
73 | char *env; |
61 | char *env; |
74 | asprintf (&env, "CONFBASE=%s", confbase); |
62 | asprintf (&env, "CONFBASE=%s", confbase); putenv (env); |
75 | putenv (env); |
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76 | asprintf (&env, "NODENAME=%s", THISNODE->nodename); |
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77 | putenv (env); |
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78 | asprintf (&env, "NODEID=%d", THISNODE->id); |
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79 | putenv (env); |
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80 | asprintf (&env, "IFNAME=%s", tap->interface ()); |
63 | asprintf (&env, "IFNAME=%s", tap->interface ()); putenv (env); |
81 | putenv (env); |
64 | asprintf (&env, "IFTYPE=%s", IFTYPE); putenv (env); |
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65 | asprintf (&env, "IFSUBTYPE=%s", IFSUBTYPE); putenv (env); |
82 | asprintf (&env, "MTU=%d", mtu); |
66 | asprintf (&env, "MTU=%d", mtu); putenv (env); |
83 | putenv (env); |
67 | asprintf (&env, "NODES=%d", conns.size ()); putenv (env); |
84 | asprintf (&env, "MAC=%02x:%02x:%02x:%02x:%02x:%02x", |
68 | asprintf (&env, "NODEID=%d", THISNODE->id); putenv (env); |
85 | 0xfe, 0xfd, 0x80, 0x00, THISNODE->id >> 8, |
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86 | THISNODE->id & 0xff); |
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87 | putenv (env); |
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88 | |
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, |
89 | 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; |
90 | } |
98 | } |
91 | |
99 | |
92 | int |
100 | int |
93 | vpn::setup () |
101 | vpn::setup () |
94 | { |
102 | { |
… | |
… | |
100 | |
108 | |
101 | if (ipv4_fd < 0) |
109 | if (ipv4_fd < 0) |
102 | return -1; |
110 | return -1; |
103 | |
111 | |
104 | fcntl (ipv4_fd, F_SETFL, O_NONBLOCK); |
112 | fcntl (ipv4_fd, F_SETFL, O_NONBLOCK); |
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113 | fcntl (ipv4_fd, F_SETFD, FD_CLOEXEC); |
105 | |
114 | |
106 | #if defined(SOL_IP) && defined(IP_MTU_DISCOVER) |
115 | #if defined(SOL_IP) && defined(IP_MTU_DISCOVER) |
107 | // this I really consider a linux bug. I am neither connected |
116 | // this I really consider a linux bug. I am neither connected |
108 | // nor do I fragment myself. Linux still sets DF and doesn't |
117 | // nor do I fragment myself. Linux still sets DF and doesn't |
109 | // fragment for me sometimes. |
118 | // fragment for me sometimes. |
… | |
… | |
116 | sockinfo si (THISNODE, PROT_IPv4); |
125 | sockinfo si (THISNODE, PROT_IPv4); |
117 | |
126 | |
118 | if (bind (ipv4_fd, si.sav4 (), si.salenv4 ())) |
127 | if (bind (ipv4_fd, si.sav4 (), si.salenv4 ())) |
119 | { |
128 | { |
120 | slog (L_ERR, _("can't bind ipv4 socket on %s: %s"), (const char *)si, strerror (errno)); |
129 | slog (L_ERR, _("can't bind ipv4 socket on %s: %s"), (const char *)si, strerror (errno)); |
121 | exit (1); |
130 | exit (EXIT_FAILURE); |
122 | } |
131 | } |
123 | |
132 | |
124 | ipv4_ev_watcher.start (ipv4_fd, POLLIN); |
133 | ipv4_ev_watcher.start (ipv4_fd, EV_READ); |
125 | } |
134 | } |
126 | |
135 | |
127 | udpv4_fd = -1; |
136 | udpv4_fd = -1; |
128 | |
137 | |
129 | if (THISNODE->protocols & PROT_UDPv4 && THISNODE->udp_port) |
138 | if (THISNODE->protocols & PROT_UDPv4 && THISNODE->udp_port) |
… | |
… | |
132 | |
141 | |
133 | if (udpv4_fd < 0) |
142 | if (udpv4_fd < 0) |
134 | return -1; |
143 | return -1; |
135 | |
144 | |
136 | fcntl (udpv4_fd, F_SETFL, O_NONBLOCK); |
145 | fcntl (udpv4_fd, F_SETFL, O_NONBLOCK); |
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146 | fcntl (udpv4_fd, F_SETFD, FD_CLOEXEC); |
137 | |
147 | |
138 | // standard daemon practise... |
148 | // standard daemon practise... |
139 | { |
149 | { |
140 | int oval = 1; |
150 | int oval = 1; |
141 | setsockopt (udpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval); |
151 | setsockopt (udpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval); |
… | |
… | |
154 | sockinfo si (THISNODE, PROT_UDPv4); |
164 | sockinfo si (THISNODE, PROT_UDPv4); |
155 | |
165 | |
156 | if (bind (udpv4_fd, si.sav4 (), si.salenv4 ())) |
166 | if (bind (udpv4_fd, si.sav4 (), si.salenv4 ())) |
157 | { |
167 | { |
158 | slog (L_ERR, _("can't bind udpv4 on %s: %s"), (const char *)si, strerror (errno)); |
168 | slog (L_ERR, _("can't bind udpv4 on %s: %s"), (const char *)si, strerror (errno)); |
159 | exit (1); |
169 | exit (EXIT_FAILURE); |
160 | } |
170 | } |
161 | |
171 | |
162 | udpv4_ev_watcher.start (udpv4_fd, POLLIN); |
172 | udpv4_ev_watcher.start (udpv4_fd, EV_READ); |
163 | } |
173 | } |
164 | |
174 | |
165 | icmpv4_fd = -1; |
175 | icmpv4_fd = -1; |
166 | |
176 | |
167 | #if ENABLE_ICMP |
177 | #if ENABLE_ICMP |
… | |
… | |
171 | |
181 | |
172 | if (icmpv4_fd < 0) |
182 | if (icmpv4_fd < 0) |
173 | return -1; |
183 | return -1; |
174 | |
184 | |
175 | fcntl (icmpv4_fd, F_SETFL, O_NONBLOCK); |
185 | fcntl (icmpv4_fd, F_SETFL, O_NONBLOCK); |
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186 | fcntl (icmpv4_fd, F_SETFD, FD_CLOEXEC); |
176 | |
187 | |
177 | #ifdef ICMP_FILTER |
188 | #ifdef ICMP_FILTER |
178 | { |
189 | { |
179 | icmp_filter oval; |
190 | icmp_filter oval; |
180 | oval.data = 0xffffffff; |
191 | oval.data = 0xffffffff; |
… | |
… | |
189 | // this I really consider a linux bug. I am neither connected |
200 | // this I really consider a linux bug. I am neither connected |
190 | // nor do I fragment myself. Linux still sets DF and doesn't |
201 | // nor do I fragment myself. Linux still sets DF and doesn't |
191 | // fragment for me sometimes. |
202 | // fragment for me sometimes. |
192 | { |
203 | { |
193 | int oval = IP_PMTUDISC_DONT; |
204 | int oval = IP_PMTUDISC_DONT; |
194 | setsockopt (udpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval); |
205 | setsockopt (icmpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval); |
195 | } |
206 | } |
196 | #endif |
207 | #endif |
197 | |
208 | |
198 | sockinfo si (THISNODE, PROT_ICMPv4); |
209 | sockinfo si (THISNODE, PROT_ICMPv4); |
199 | |
210 | |
200 | if (bind (icmpv4_fd, si.sav4 (), si.salenv4 ())) |
211 | if (bind (icmpv4_fd, si.sav4 (), si.salenv4 ())) |
201 | { |
212 | { |
202 | slog (L_ERR, _("can't bind icmpv4 on %s: %s"), (const char *)si, strerror (errno)); |
213 | slog (L_ERR, _("can't bind icmpv4 on %s: %s"), (const char *)si, strerror (errno)); |
203 | exit (1); |
214 | exit (EXIT_FAILURE); |
204 | } |
215 | } |
205 | |
216 | |
206 | icmpv4_ev_watcher.start (icmpv4_fd, POLLIN); |
217 | icmpv4_ev_watcher.start (icmpv4_fd, EV_READ); |
207 | } |
218 | } |
208 | #endif |
219 | #endif |
209 | |
220 | |
210 | tcpv4_fd = -1; |
221 | tcpv4_fd = -1; |
211 | |
222 | |
… | |
… | |
216 | |
227 | |
217 | if (tcpv4_fd < 0) |
228 | if (tcpv4_fd < 0) |
218 | return -1; |
229 | return -1; |
219 | |
230 | |
220 | fcntl (tcpv4_fd, F_SETFL, O_NONBLOCK); |
231 | fcntl (tcpv4_fd, F_SETFL, O_NONBLOCK); |
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232 | fcntl (tcpv4_fd, F_SETFD, FD_CLOEXEC); |
221 | |
233 | |
222 | // standard daemon practise... |
234 | // standard daemon practise... |
223 | { |
235 | { |
224 | int oval = 1; |
236 | int oval = 1; |
225 | setsockopt (tcpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval); |
237 | setsockopt (tcpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval); |
… | |
… | |
228 | sockinfo si (THISNODE, PROT_TCPv4); |
240 | sockinfo si (THISNODE, PROT_TCPv4); |
229 | |
241 | |
230 | if (bind (tcpv4_fd, si.sav4 (), si.salenv4 ())) |
242 | if (bind (tcpv4_fd, si.sav4 (), si.salenv4 ())) |
231 | { |
243 | { |
232 | slog (L_ERR, _("can't bind tcpv4 on %s: %s"), (const char *)si, strerror (errno)); |
244 | slog (L_ERR, _("can't bind tcpv4 on %s: %s"), (const char *)si, strerror (errno)); |
233 | exit (1); |
245 | exit (EXIT_FAILURE); |
234 | } |
246 | } |
235 | |
247 | |
236 | if (listen (tcpv4_fd, 5)) |
248 | if (listen (tcpv4_fd, 5)) |
237 | { |
249 | { |
238 | slog (L_ERR, _("can't listen tcpv4 on %s: %s"), (const char *)si, strerror (errno)); |
250 | slog (L_ERR, _("can't listen tcpv4 on %s: %s"), (const char *)si, strerror (errno)); |
239 | exit (1); |
251 | exit (EXIT_FAILURE); |
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252 | } |
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253 | |
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254 | tcpv4_ev_watcher.start (tcpv4_fd, EV_READ); |
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255 | } |
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256 | #endif |
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257 | |
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258 | #if ENABLE_DNS |
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259 | if (THISNODE->protocols & PROT_DNSv4) |
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260 | { |
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261 | dns_forwarder.set (::conf.dns_forw_host, ::conf.dns_forw_port, PROT_DNSv4); |
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262 | |
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263 | dnsv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP); |
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264 | |
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265 | if (dnsv4_fd < 0) |
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266 | return -1; |
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267 | |
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268 | fcntl (dnsv4_fd, F_SETFL, O_NONBLOCK); |
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269 | fcntl (dnsv4_fd, F_SETFD, FD_CLOEXEC); |
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270 | |
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271 | # if defined(SOL_IP) && defined(IP_MTU_DISCOVER) |
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272 | // this I really consider a linux bug. I am neither connected |
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273 | // nor do I fragment myself. Linux still sets DF and doesn't |
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274 | // fragment for me sometimes. |
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275 | { |
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276 | int oval = IP_PMTUDISC_DONT; |
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277 | setsockopt (dnsv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval); |
240 | } |
278 | } |
241 | |
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242 | tcpv4_ev_watcher.start (tcpv4_fd, POLLIN); |
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243 | } |
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244 | #endif |
279 | # endif |
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280 | |
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281 | // standard daemon practise... |
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282 | { |
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283 | int oval = 1; |
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284 | setsockopt (dnsv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval); |
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285 | } |
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286 | |
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287 | sockinfo si (THISNODE->dns_hostname, |
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288 | THISNODE->dns_hostname ? THISNODE->dns_port : 0, |
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289 | PROT_DNSv4); |
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290 | |
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291 | if (bind (dnsv4_fd, si.sav4 (), si.salenv4 ())) |
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292 | { |
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293 | slog (L_ERR, _("can't bind dnsv4 on %s: %s"), (const char *)si, strerror (errno)); |
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294 | exit (EXIT_FAILURE); |
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295 | } |
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296 | |
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297 | dnsv4_ev_watcher.start (dnsv4_fd, EV_READ); |
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298 | } |
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299 | #endif |
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300 | |
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301 | ///////////////////////////////////////////////////////////////////////////// |
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302 | |
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303 | reconnect_all (); |
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304 | |
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305 | ///////////////////////////////////////////////////////////////////////////// |
245 | |
306 | |
246 | tap = new tap_device (); |
307 | tap = new tap_device (); |
247 | if (!tap) //D this, of course, never catches |
308 | if (!tap) //D this, of course, never catches |
248 | { |
309 | { |
249 | slog (L_ERR, _("cannot create network interface '%s'"), conf.ifname); |
310 | slog (L_ERR, _("cannot create network interface '%s'"), conf.ifname); |
250 | exit (1); |
311 | exit (EXIT_FAILURE); |
251 | } |
312 | } |
252 | |
313 | |
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314 | fcntl (tap->fd, F_SETFD, FD_CLOEXEC); |
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315 | |
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316 | if (tap->if_up () && |
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317 | !run_script (run_script_cb (this, &vpn::script_if_init), true)) |
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318 | { |
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319 | slog (L_ERR, _("interface initialization command '%s' failed, exiting."), |
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320 | tap->if_up ()); |
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321 | exit (EXIT_FAILURE); |
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322 | } |
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323 | |
253 | run_script (run_script_cb (this, &vpn::script_if_up), true); |
324 | if (!run_script (run_script_cb (this, &vpn::script_if_up), true)) |
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325 | { |
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326 | slog (L_ERR, _("if-up command execution failed, exiting.")); |
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327 | exit (EXIT_FAILURE); |
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328 | } |
254 | |
329 | |
255 | tap_ev_watcher.start (tap->fd, POLLIN); |
330 | tap_ev_watcher.start (tap->fd, EV_READ); |
256 | |
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257 | reconnect_all (); |
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258 | |
331 | |
259 | return 0; |
332 | return 0; |
260 | } |
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261 | |
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262 | // send a vpn packet out to other hosts |
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263 | bool |
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264 | vpn::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
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265 | { |
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266 | switch (si.prot) |
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267 | { |
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268 | case PROT_IPv4: |
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269 | return send_ipv4_packet (pkt, si, tos); |
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270 | |
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271 | case PROT_UDPv4: |
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272 | return send_udpv4_packet (pkt, si, tos); |
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273 | |
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274 | #if ENABLE_TCP |
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275 | case PROT_TCPv4: |
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276 | return send_tcpv4_packet (pkt, si, tos); |
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277 | #endif |
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278 | |
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279 | #if ENABLE_ICMP |
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280 | case PROT_ICMPv4: |
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281 | return send_icmpv4_packet (pkt, si, tos); |
|
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282 | #endif |
|
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283 | |
|
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284 | default: |
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285 | slog (L_CRIT, _("%s: FATAL: trying to send packet with unsupported protocol"), (const char *)si); |
|
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286 | return false; |
|
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287 | } |
|
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288 | } |
333 | } |
289 | |
334 | |
290 | bool |
335 | bool |
291 | vpn::send_ipv4_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
336 | vpn::send_ipv4_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
292 | { |
337 | { |
… | |
… | |
320 | |
365 | |
321 | return ~sum; |
366 | return ~sum; |
322 | } |
367 | } |
323 | |
368 | |
324 | #if ENABLE_ICMP |
369 | #if ENABLE_ICMP |
325 | struct icmp_header { |
|
|
326 | u8 type; |
|
|
327 | u8 code; |
|
|
328 | u16 checksum; |
|
|
329 | union { |
|
|
330 | struct { |
|
|
331 | u16 id; |
|
|
332 | u16 sequence; |
|
|
333 | } echo; |
|
|
334 | u32 gateway; |
|
|
335 | struct { |
|
|
336 | u16 unused; |
|
|
337 | u16 mtu; |
|
|
338 | } frag; |
|
|
339 | } un; |
|
|
340 | }; |
|
|
341 | |
|
|
342 | bool |
370 | bool |
343 | vpn::send_icmpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
371 | vpn::send_icmpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
344 | { |
372 | { |
345 | #if defined(SOL_IP) && defined(IP_TOS) |
373 | #if defined(SOL_IP) && defined(IP_TOS) |
346 | setsockopt (icmpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos); |
374 | setsockopt (icmpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos); |
… | |
… | |
367 | setsockopt (udpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos); |
395 | setsockopt (udpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos); |
368 | #endif |
396 | #endif |
369 | sendto (udpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ()); |
397 | sendto (udpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ()); |
370 | |
398 | |
371 | return true; |
399 | return true; |
|
|
400 | } |
|
|
401 | |
|
|
402 | void |
|
|
403 | vpn::inject_data_packet (tap_packet *pkt, int dst) |
|
|
404 | { |
|
|
405 | if (dst) |
|
|
406 | { |
|
|
407 | // unicast |
|
|
408 | if (dst != THISNODE->id) |
|
|
409 | conns[dst - 1]->inject_data_packet (pkt); |
|
|
410 | } |
|
|
411 | else |
|
|
412 | { |
|
|
413 | // broadcast, this is ugly, but due to the security policy |
|
|
414 | // we have to connect to all hosts... |
|
|
415 | for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c) |
|
|
416 | if ((*c)->conf != THISNODE) |
|
|
417 | (*c)->inject_data_packet (pkt, true); |
|
|
418 | } |
372 | } |
419 | } |
373 | |
420 | |
374 | void |
421 | void |
375 | vpn::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi) |
422 | vpn::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi) |
376 | { |
423 | { |
… | |
… | |
393 | connection *c = conns[src - 1]; |
440 | connection *c = conns[src - 1]; |
394 | |
441 | |
395 | if (dst == 0) |
442 | if (dst == 0) |
396 | slog (L_WARN, _("%s(%s): received broadcast (protocol violation)"), |
443 | slog (L_WARN, _("%s(%s): received broadcast (protocol violation)"), |
397 | c->conf->nodename, (const char *)rsi); |
444 | c->conf->nodename, (const char *)rsi); |
398 | else if (dst != 0 && dst != THISNODE->id) |
445 | else if (dst != THISNODE->id) |
399 | { |
446 | { |
400 | if (THISNODE->routerprio) |
447 | if (THISNODE->routerprio) |
401 | // the tos setting gets lost here. who cares. |
448 | // the tos setting gets lost here. who cares. |
402 | conns[dst - 1]->inject_vpn_packet (pkt); |
449 | conns[dst - 1]->inject_vpn_packet (pkt); |
403 | else |
450 | else |
… | |
… | |
409 | else |
456 | else |
410 | c->recv_vpn_packet (pkt, rsi); |
457 | c->recv_vpn_packet (pkt, rsi); |
411 | } |
458 | } |
412 | } |
459 | } |
413 | |
460 | |
|
|
461 | bool |
|
|
462 | vpn::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
|
|
463 | { |
|
|
464 | switch (si.prot) |
|
|
465 | { |
|
|
466 | case PROT_IPv4: |
|
|
467 | return send_ipv4_packet (pkt, si, tos); |
|
|
468 | case PROT_UDPv4: |
|
|
469 | return send_udpv4_packet (pkt, si, tos); |
|
|
470 | #if ENABLE_TCP |
|
|
471 | case PROT_TCPv4: |
|
|
472 | return send_tcpv4_packet (pkt, si, tos); |
|
|
473 | #endif |
|
|
474 | #if ENABLE_ICMP |
|
|
475 | case PROT_ICMPv4: |
|
|
476 | return send_icmpv4_packet (pkt, si, tos); |
|
|
477 | #endif |
|
|
478 | #if ENABLE_DNS |
|
|
479 | case PROT_DNSv4: |
|
|
480 | return send_dnsv4_packet (pkt, si, tos); |
|
|
481 | #endif |
|
|
482 | |
|
|
483 | default: |
|
|
484 | slog (L_CRIT, _("%s: FATAL: trying to send packet with unsupported protocol"), (const char *)si); |
|
|
485 | } |
|
|
486 | |
|
|
487 | return false; |
|
|
488 | } |
|
|
489 | |
414 | void |
490 | void |
415 | vpn::ipv4_ev (io_watcher &w, short revents) |
491 | vpn::ipv4_ev (ev::io &w, int revents) |
416 | { |
492 | { |
417 | if (revents & (POLLIN | POLLERR)) |
493 | if (revents & EV_READ) |
418 | { |
494 | { |
419 | vpn_packet *pkt = new vpn_packet; |
495 | vpn_packet *pkt = new vpn_packet; |
420 | struct sockaddr_in sa; |
496 | struct sockaddr_in sa; |
421 | socklen_t sa_len = sizeof (sa); |
497 | socklen_t sa_len = sizeof (sa); |
422 | int len; |
498 | int len; |
… | |
… | |
427 | |
503 | |
428 | if (len > 0) |
504 | if (len > 0) |
429 | { |
505 | { |
430 | pkt->len = len; |
506 | pkt->len = len; |
431 | |
507 | |
432 | // raw sockets deliver the ipv4, but don't expect it on sends |
508 | // raw sockets deliver the ipv4 header, but don't expect it on sends |
433 | // this is slow, but... |
|
|
434 | pkt->skip_hdr (IP_OVERHEAD); |
509 | pkt->skip_hdr (IP_OVERHEAD); |
435 | |
510 | |
436 | recv_vpn_packet (pkt, si); |
511 | recv_vpn_packet (pkt, si); |
437 | } |
512 | } |
438 | else |
513 | else |
… | |
… | |
441 | slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno)); |
516 | slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno)); |
442 | } |
517 | } |
443 | |
518 | |
444 | delete pkt; |
519 | delete pkt; |
445 | } |
520 | } |
446 | else if (revents & POLLHUP) |
|
|
447 | { |
|
|
448 | // this cannot ;) happen on udp sockets |
|
|
449 | slog (L_ERR, _("FATAL: POLLHUP on ipv4 fd, terminating.")); |
|
|
450 | exit (1); |
|
|
451 | } |
|
|
452 | else |
521 | else |
453 | { |
522 | { |
454 | slog (L_ERR, |
523 | slog (L_ERR, |
455 | _("FATAL: unknown revents %08x in socket, terminating\n"), |
524 | _("FATAL: unknown revents %08x in socket, terminating\n"), |
456 | revents); |
525 | revents); |
457 | exit (1); |
526 | exit (EXIT_FAILURE); |
458 | } |
527 | } |
459 | } |
528 | } |
460 | |
529 | |
461 | #if ENABLE_ICMP |
530 | #if ENABLE_ICMP |
462 | void |
531 | void |
463 | vpn::icmpv4_ev (io_watcher &w, short revents) |
532 | vpn::icmpv4_ev (ev::io &w, int revents) |
464 | { |
533 | { |
465 | if (revents & (POLLIN | POLLERR)) |
534 | if (revents & EV_READ) |
466 | { |
535 | { |
467 | vpn_packet *pkt = new vpn_packet; |
536 | vpn_packet *pkt = new vpn_packet; |
468 | struct sockaddr_in sa; |
537 | struct sockaddr_in sa; |
469 | socklen_t sa_len = sizeof (sa); |
538 | socklen_t sa_len = sizeof (sa); |
470 | int len; |
539 | int len; |
… | |
… | |
495 | slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno)); |
564 | slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno)); |
496 | } |
565 | } |
497 | |
566 | |
498 | delete pkt; |
567 | delete pkt; |
499 | } |
568 | } |
500 | else if (revents & POLLHUP) |
|
|
501 | { |
|
|
502 | // this cannot ;) happen on udp sockets |
|
|
503 | slog (L_ERR, _("FATAL: POLLHUP on icmpv4 fd, terminating.")); |
|
|
504 | exit (1); |
|
|
505 | } |
|
|
506 | else |
569 | else |
507 | { |
570 | { |
508 | slog (L_ERR, |
571 | slog (L_ERR, |
509 | _("FATAL: unknown revents %08x in socket, terminating\n"), |
572 | _("FATAL: unknown revents %08x in socket, terminating\n"), |
510 | revents); |
573 | revents); |
511 | exit (1); |
574 | exit (EXIT_FAILURE); |
512 | } |
575 | } |
513 | } |
576 | } |
514 | #endif |
577 | #endif |
515 | |
578 | |
516 | void |
579 | void |
517 | vpn::udpv4_ev (io_watcher &w, short revents) |
580 | vpn::udpv4_ev (ev::io &w, int revents) |
518 | { |
581 | { |
519 | if (revents & (POLLIN | POLLERR)) |
582 | if (revents & EV_READ) |
520 | { |
583 | { |
521 | vpn_packet *pkt = new vpn_packet; |
584 | vpn_packet *pkt = new vpn_packet; |
522 | struct sockaddr_in sa; |
585 | struct sockaddr_in sa; |
523 | socklen_t sa_len = sizeof (sa); |
586 | socklen_t sa_len = sizeof (sa); |
524 | int len; |
587 | int len; |
… | |
… | |
539 | slog (L_DEBUG, _("%s: fd %d, %s"), (const char *)si, w.fd, strerror (errno)); |
602 | slog (L_DEBUG, _("%s: fd %d, %s"), (const char *)si, w.fd, strerror (errno)); |
540 | } |
603 | } |
541 | |
604 | |
542 | delete pkt; |
605 | delete pkt; |
543 | } |
606 | } |
544 | else if (revents & POLLHUP) |
|
|
545 | { |
|
|
546 | // this cannot ;) happen on udp sockets |
|
|
547 | slog (L_ERR, _("FATAL: POLLHUP on udp v4 fd, terminating.")); |
|
|
548 | exit (1); |
|
|
549 | } |
|
|
550 | else |
607 | else |
551 | { |
608 | { |
552 | slog (L_ERR, |
609 | slog (L_ERR, |
553 | _("FATAL: unknown revents %08x in socket, terminating\n"), |
610 | _("FATAL: unknown revents %08x in socket, terminating\n"), |
554 | revents); |
611 | revents); |
555 | exit (1); |
612 | exit (EXIT_FAILURE); |
556 | } |
613 | } |
557 | } |
614 | } |
558 | |
615 | |
559 | void |
616 | void |
560 | vpn::tap_ev (io_watcher &w, short revents) |
617 | vpn::tap_ev (ev::io &w, int revents) |
561 | { |
618 | { |
562 | if (revents & POLLIN) |
619 | if (revents & EV_READ) |
563 | { |
620 | { |
564 | /* process data */ |
621 | /* process data */ |
565 | tap_packet *pkt; |
622 | tap_packet *pkt; |
566 | |
623 | |
567 | pkt = tap->recv (); |
624 | pkt = tap->recv (); |
568 | |
625 | |
|
|
626 | if (!pkt) |
|
|
627 | return; |
|
|
628 | |
|
|
629 | if (pkt->len > 14) |
|
|
630 | { |
569 | int dst = mac2id (pkt->dst); |
631 | int dst = mac2id (pkt->dst); |
570 | int src = mac2id (pkt->src); |
632 | int src = mac2id (pkt->src); |
571 | |
633 | |
572 | if (src != THISNODE->id) |
634 | if (src != THISNODE->id) |
573 | { |
|
|
574 | slog (L_ERR, _("FATAL: tap packet not originating on current node received, exiting.")); |
|
|
575 | exit (1); |
|
|
576 | } |
|
|
577 | |
|
|
578 | if (dst == THISNODE->id) |
|
|
579 | { |
|
|
580 | slog (L_ERR, _("FATAL: tap packet destined for current node received, exiting.")); |
|
|
581 | exit (1); |
|
|
582 | } |
|
|
583 | |
|
|
584 | if (dst > conns.size ()) |
|
|
585 | slog (L_ERR, _("tap packet for unknown node %d received, ignoring."), dst); |
|
|
586 | else |
|
|
587 | { |
|
|
588 | if (dst) |
|
|
589 | { |
635 | { |
590 | // unicast |
636 | slog (L_ERR, _("FATAL: tap packet not originating on current node received (if-up script not working properly?), exiting.")); |
591 | if (dst != THISNODE->id) |
637 | exit (EXIT_FAILURE); |
592 | conns[dst - 1]->inject_data_packet (pkt); |
|
|
593 | } |
638 | } |
|
|
639 | |
|
|
640 | if (dst == THISNODE->id) |
|
|
641 | { |
|
|
642 | slog (L_ERR, _("FATAL: tap packet destined for current node received, exiting.")); |
|
|
643 | exit (EXIT_FAILURE); |
|
|
644 | } |
|
|
645 | |
|
|
646 | if (dst > conns.size ()) |
|
|
647 | slog (L_ERR, _("tap packet for unknown node %d received, ignoring."), dst); |
594 | else |
648 | else |
595 | { |
|
|
596 | // broadcast, this is ugly, but due to the security policy |
|
|
597 | // we have to connect to all hosts... |
|
|
598 | for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c) |
|
|
599 | if ((*c)->conf != THISNODE) |
|
|
600 | (*c)->inject_data_packet (pkt); |
649 | inject_data_packet (pkt, dst); |
601 | } |
|
|
602 | } |
650 | } |
603 | |
651 | |
604 | delete pkt; |
652 | delete pkt; |
605 | } |
|
|
606 | else if (revents & (POLLHUP | POLLERR)) |
|
|
607 | { |
|
|
608 | slog (L_ERR, _("FATAL: POLLHUP or POLLERR on network device fd, terminating.")); |
|
|
609 | exit (1); |
|
|
610 | } |
653 | } |
611 | else |
654 | else |
612 | abort (); |
655 | abort (); |
613 | } |
656 | } |
614 | |
657 | |
615 | void |
658 | void |
616 | vpn::event_cb (time_watcher &w) |
659 | vpn::event_cb (ev::timer &w, int) |
617 | { |
660 | { |
618 | if (events) |
661 | if (events) |
619 | { |
662 | { |
620 | if (events & EVENT_SHUTDOWN) |
663 | if (events & EVENT_SHUTDOWN) |
621 | { |
664 | { |
622 | slog (L_INFO, _("preparing shutdown...")); |
665 | slog (L_INFO, _("preparing shutdown...")); |
623 | |
666 | |
624 | shutdown_all (); |
667 | shutdown_all (); |
625 | |
|
|
626 | remove_pid (pidfilename); |
668 | remove_pid (conf.pidfilename); |
627 | |
|
|
628 | slog (L_INFO, _("terminating")); |
669 | slog (L_INFO, _("terminating")); |
629 | |
670 | exit (EXIT_SUCCESS); |
630 | exit (0); |
|
|
631 | } |
671 | } |
632 | |
672 | |
633 | if (events & EVENT_RECONNECT) |
673 | if (events & EVENT_RECONNECT) |
634 | { |
674 | { |
635 | slog (L_INFO, _("forced reconnect")); |
675 | slog (L_INFO, _("forced reconnect")); |
… | |
… | |
637 | reconnect_all (); |
677 | reconnect_all (); |
638 | } |
678 | } |
639 | |
679 | |
640 | events = 0; |
680 | events = 0; |
641 | } |
681 | } |
642 | |
|
|
643 | w.at = TSTAMP_CANCEL; |
|
|
644 | } |
682 | } |
645 | |
683 | |
646 | void |
684 | void |
647 | vpn::shutdown_all () |
685 | vpn::shutdown_all () |
648 | { |
686 | { |
… | |
… | |
661 | connection_init (); |
699 | connection_init (); |
662 | |
700 | |
663 | for (configuration::node_vector::iterator i = conf.nodes.begin (); |
701 | for (configuration::node_vector::iterator i = conf.nodes.begin (); |
664 | i != conf.nodes.end (); ++i) |
702 | i != conf.nodes.end (); ++i) |
665 | { |
703 | { |
666 | connection *conn = new connection (this); |
704 | connection *conn = new connection (this, *i); |
667 | |
|
|
668 | conn->conf = *i; |
|
|
669 | conns.push_back (conn); |
705 | conns.push_back (conn); |
670 | |
|
|
671 | conn->establish_connection (); |
706 | conn->establish_connection (); |
672 | } |
707 | } |
673 | } |
708 | } |
674 | |
709 | |
675 | connection *vpn::find_router () |
710 | connection *vpn::find_router () |
… | |
… | |
720 | } |
755 | } |
721 | |
756 | |
722 | void |
757 | void |
723 | vpn::dump_status () |
758 | vpn::dump_status () |
724 | { |
759 | { |
725 | slog (L_NOTICE, _("BEGIN status dump (%ld)"), (long)NOW); |
760 | slog (L_NOTICE, _("BEGIN status dump (%ld)"), (long)ev_now ()); |
726 | |
761 | |
727 | for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c) |
762 | for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c) |
728 | (*c)->dump_status (); |
763 | (*c)->dump_status (); |
729 | |
764 | |
730 | slog (L_NOTICE, _("END status dump")); |
765 | slog (L_NOTICE, _("END status dump")); |
… | |
… | |
738 | , tcpv4_ev_watcher (this, &vpn::tcpv4_ev) |
773 | , tcpv4_ev_watcher (this, &vpn::tcpv4_ev) |
739 | #endif |
774 | #endif |
740 | #if ENABLE_ICMP |
775 | #if ENABLE_ICMP |
741 | , icmpv4_ev_watcher(this, &vpn::icmpv4_ev) |
776 | , icmpv4_ev_watcher(this, &vpn::icmpv4_ev) |
742 | #endif |
777 | #endif |
|
|
778 | #if ENABLE_DNS |
|
|
779 | , dnsv4_ev_watcher (this, &vpn::dnsv4_ev) |
|
|
780 | #endif |
743 | , tap_ev_watcher (this, &vpn::tap_ev) |
781 | , tap_ev_watcher (this, &vpn::tap_ev) |
744 | { |
782 | { |
745 | } |
783 | } |
746 | |
784 | |
747 | vpn::~vpn () |
785 | vpn::~vpn () |