1 |
pcg |
1.1 |
/* |
2 |
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vpn.C -- handle the protocol, encryption, handshaking etc. |
3 |
pcg |
1.47 |
Copyright (C) 2003-2008 Marc Lehmann <gvpe@schmorp.de> |
4 |
pcg |
1.1 |
|
5 |
pcg |
1.28 |
This file is part of GVPE. |
6 |
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|
7 |
pcg |
1.47 |
GVPE is free software; you can redistribute it and/or modify it |
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under the terms of the GNU General Public License as published by the |
9 |
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Free Software Foundation; either version 3 of the License, or (at your |
10 |
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option) any later version. |
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This program is distributed in the hope that it will be useful, but |
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WITHOUT ANY WARRANTY; without even the implied warranty of |
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General |
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Public License for more details. |
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You should have received a copy of the GNU General Public License along |
18 |
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with this program; if not, see <http://www.gnu.org/licenses/>. |
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Additional permission under GNU GPL version 3 section 7 |
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22 |
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If you modify this Program, or any covered work, by linking or |
23 |
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combining it with the OpenSSL project's OpenSSL library (or a modified |
24 |
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version of that library), containing parts covered by the terms of the |
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OpenSSL or SSLeay licenses, the licensors of this Program grant you |
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additional permission to convey the resulting work. Corresponding |
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Source for a non-source form of such a combination shall include the |
28 |
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source code for the parts of OpenSSL used as well as that of the |
29 |
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covered work. |
30 |
pcg |
1.1 |
*/ |
31 |
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32 |
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#include "config.h" |
33 |
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34 |
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#include <list> |
35 |
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36 |
pcg |
1.23 |
#include <cstdio> |
37 |
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#include <cstring> |
38 |
pcg |
1.1 |
#include <cstdlib> |
39 |
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40 |
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#include <sys/types.h> |
41 |
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#include <sys/socket.h> |
42 |
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#include <sys/wait.h> |
43 |
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#include <errno.h> |
44 |
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#include <time.h> |
45 |
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#include <unistd.h> |
46 |
pcg |
1.11 |
#include <fcntl.h> |
47 |
pcg |
1.14 |
#include <sys/socket.h> |
48 |
pcg |
1.15 |
|
49 |
|
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#include "netcompat.h" |
50 |
pcg |
1.1 |
|
51 |
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#include "pidfile.h" |
52 |
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53 |
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#include "connection.h" |
54 |
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#include "util.h" |
55 |
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#include "vpn.h" |
56 |
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57 |
pcg |
1.20 |
vpn network; // THE vpn (bad design...) |
58 |
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|
59 |
pcg |
1.1 |
///////////////////////////////////////////////////////////////////////////// |
60 |
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61 |
pcg |
1.41 |
static void inline |
62 |
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set_tos (int fd, int &tos_prev, int tos) |
63 |
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{ |
64 |
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#if defined(SOL_IP) && defined(IP_TOS) |
65 |
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if (tos_prev == tos) |
66 |
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return; |
67 |
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68 |
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tos_prev = tos; |
69 |
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setsockopt (fd, SOL_IP, IP_TOS, &tos, sizeof tos); |
70 |
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#endif |
71 |
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} |
72 |
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73 |
pcg |
1.33 |
void |
74 |
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vpn::script_init_env () |
75 |
pcg |
1.1 |
{ |
76 |
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// the tunnel device mtu should be the physical mtu - overhead |
77 |
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// the tricky part is rounding to the cipher key blocksize |
78 |
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int mtu = conf.mtu - ETH_OVERHEAD - VPE_OVERHEAD - MAX_OVERHEAD; |
79 |
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mtu += ETH_OVERHEAD - 6 - 6; // now we have the data portion |
80 |
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mtu -= mtu % EVP_CIPHER_block_size (CIPHER); // round |
81 |
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mtu -= ETH_OVERHEAD - 6 - 6; // and get interface mtu again |
82 |
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|
83 |
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char *env; |
84 |
pcg |
1.21 |
asprintf (&env, "CONFBASE=%s", confbase); putenv (env); |
85 |
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asprintf (&env, "IFNAME=%s", tap->interface ()); putenv (env); |
86 |
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asprintf (&env, "IFTYPE=%s", IFTYPE); putenv (env); |
87 |
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asprintf (&env, "IFSUBTYPE=%s", IFSUBTYPE); putenv (env); |
88 |
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asprintf (&env, "MTU=%d", mtu); putenv (env); |
89 |
pcg |
1.34 |
asprintf (&env, "NODES=%d", conns.size ()); putenv (env); |
90 |
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asprintf (&env, "NODEID=%d", THISNODE->id); putenv (env); |
91 |
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92 |
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conns [THISNODE->id - 1]->script_init_env (""); |
93 |
pcg |
1.33 |
|
94 |
pcg |
1.34 |
for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c) |
95 |
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{ |
96 |
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char ext[16]; |
97 |
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snprintf (ext, 16, "_%d", (*c)->conf->id); |
98 |
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(*c)->script_init_env (ext); |
99 |
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} |
100 |
pcg |
1.33 |
} |
101 |
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102 |
pcg |
1.45 |
inline const char * |
103 |
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vpn::script_if_init () |
104 |
pcg |
1.33 |
{ |
105 |
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script_init_env (); |
106 |
pcg |
1.1 |
|
107 |
pcg |
1.33 |
return tap->if_up (); |
108 |
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} |
109 |
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110 |
pcg |
1.45 |
inline const char * |
111 |
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vpn::script_if_up () |
112 |
pcg |
1.33 |
{ |
113 |
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script_init_env (); |
114 |
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115 |
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char *filename; |
116 |
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asprintf (&filename, |
117 |
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"%s/%s", |
118 |
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confbase, |
119 |
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::conf.script_if_up ? ::conf.script_if_up : "if-up"); |
120 |
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121 |
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return filename; |
122 |
pcg |
1.1 |
} |
123 |
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124 |
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int |
125 |
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vpn::setup () |
126 |
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{ |
127 |
pcg |
1.51 |
int success = 0; |
128 |
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129 |
pcg |
1.41 |
ipv4_tos = -1; |
130 |
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ipv4_fd = -1; |
131 |
pcg |
1.1 |
|
132 |
pcg |
1.8 |
if (THISNODE->protocols & PROT_IPv4 && ::conf.ip_proto) |
133 |
pcg |
1.1 |
{ |
134 |
pcg |
1.8 |
ipv4_fd = socket (PF_INET, SOCK_RAW, ::conf.ip_proto); |
135 |
pcg |
1.1 |
|
136 |
pcg |
1.8 |
if (ipv4_fd < 0) |
137 |
pcg |
1.1 |
return -1; |
138 |
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|
139 |
pcg |
1.11 |
fcntl (ipv4_fd, F_SETFL, O_NONBLOCK); |
140 |
pcg |
1.37 |
fcntl (ipv4_fd, F_SETFD, FD_CLOEXEC); |
141 |
pcg |
1.11 |
|
142 |
pcg |
1.14 |
#if defined(SOL_IP) && defined(IP_MTU_DISCOVER) |
143 |
pcg |
1.1 |
// this I really consider a linux bug. I am neither connected |
144 |
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// nor do I fragment myself. Linux still sets DF and doesn't |
145 |
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// fragment for me sometimes. |
146 |
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{ |
147 |
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int oval = IP_PMTUDISC_DONT; |
148 |
pcg |
1.8 |
setsockopt (ipv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval); |
149 |
pcg |
1.1 |
} |
150 |
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#endif |
151 |
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|
152 |
pcg |
1.9 |
sockinfo si (THISNODE, PROT_IPv4); |
153 |
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154 |
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if (bind (ipv4_fd, si.sav4 (), si.salenv4 ())) |
155 |
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{ |
156 |
pcg |
1.49 |
slog (L_ERR, _("can't bind ipv4 socket on %s: %s, exiting."), (const char *)si, strerror (errno)); |
157 |
pcg |
1.23 |
exit (EXIT_FAILURE); |
158 |
pcg |
1.9 |
} |
159 |
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|
160 |
pcg |
1.39 |
ipv4_ev_watcher.start (ipv4_fd, EV_READ); |
161 |
pcg |
1.51 |
++success; |
162 |
pcg |
1.1 |
} |
163 |
pcg |
1.51 |
else |
164 |
|
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THISNODE->protocols &= ~PROT_IPv4; |
165 |
pcg |
1.1 |
|
166 |
pcg |
1.41 |
udpv4_tos = -1; |
167 |
|
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udpv4_fd = -1; |
168 |
pcg |
1.8 |
|
169 |
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if (THISNODE->protocols & PROT_UDPv4 && THISNODE->udp_port) |
170 |
pcg |
1.1 |
{ |
171 |
pcg |
1.8 |
udpv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP); |
172 |
pcg |
1.1 |
|
173 |
pcg |
1.8 |
if (udpv4_fd < 0) |
174 |
pcg |
1.1 |
return -1; |
175 |
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|
176 |
pcg |
1.11 |
fcntl (udpv4_fd, F_SETFL, O_NONBLOCK); |
177 |
pcg |
1.37 |
fcntl (udpv4_fd, F_SETFD, FD_CLOEXEC); |
178 |
pcg |
1.11 |
|
179 |
pcg |
1.8 |
// standard daemon practise... |
180 |
|
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{ |
181 |
|
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int oval = 1; |
182 |
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setsockopt (udpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval); |
183 |
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} |
184 |
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|
185 |
pcg |
1.14 |
#if defined(SOL_IP) && defined(IP_MTU_DISCOVER) |
186 |
pcg |
1.9 |
// this I really consider a linux bug. I am neither connected |
187 |
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// nor do I fragment myself. Linux still sets DF and doesn't |
188 |
|
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// fragment for me sometimes. |
189 |
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{ |
190 |
|
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int oval = IP_PMTUDISC_DONT; |
191 |
|
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setsockopt (udpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval); |
192 |
|
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} |
193 |
|
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#endif |
194 |
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|
195 |
pcg |
1.8 |
sockinfo si (THISNODE, PROT_UDPv4); |
196 |
pcg |
1.2 |
|
197 |
pcg |
1.8 |
if (bind (udpv4_fd, si.sav4 (), si.salenv4 ())) |
198 |
pcg |
1.1 |
{ |
199 |
pcg |
1.49 |
slog (L_ERR, _("can't bind udpv4 on %s: %s, exiting."), (const char *)si, strerror (errno)); |
200 |
pcg |
1.23 |
exit (EXIT_FAILURE); |
201 |
pcg |
1.1 |
} |
202 |
|
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|
203 |
pcg |
1.39 |
udpv4_ev_watcher.start (udpv4_fd, EV_READ); |
204 |
pcg |
1.51 |
++success; |
205 |
pcg |
1.9 |
} |
206 |
pcg |
1.51 |
else |
207 |
|
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THISNODE->protocols &= ~PROT_UDPv4; |
208 |
pcg |
1.9 |
|
209 |
pcg |
1.41 |
icmpv4_tos = -1; |
210 |
|
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icmpv4_fd = -1; |
211 |
pcg |
1.9 |
|
212 |
|
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#if ENABLE_ICMP |
213 |
|
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if (THISNODE->protocols & PROT_ICMPv4) |
214 |
|
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{ |
215 |
|
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icmpv4_fd = socket (PF_INET, SOCK_RAW, IPPROTO_ICMP); |
216 |
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|
217 |
|
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if (icmpv4_fd < 0) |
218 |
|
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return -1; |
219 |
|
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|
220 |
pcg |
1.11 |
fcntl (icmpv4_fd, F_SETFL, O_NONBLOCK); |
221 |
pcg |
1.37 |
fcntl (icmpv4_fd, F_SETFD, FD_CLOEXEC); |
222 |
pcg |
1.11 |
|
223 |
pcg |
1.9 |
#ifdef ICMP_FILTER |
224 |
|
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{ |
225 |
|
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icmp_filter oval; |
226 |
|
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oval.data = 0xffffffff; |
227 |
|
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if (::conf.icmp_type < 32) |
228 |
|
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oval.data &= ~(1 << ::conf.icmp_type); |
229 |
|
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|
230 |
|
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setsockopt (icmpv4_fd, SOL_RAW, ICMP_FILTER, &oval, sizeof oval); |
231 |
|
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} |
232 |
|
|
#endif |
233 |
|
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|
234 |
pcg |
1.14 |
#if defined(SOL_IP) && defined(IP_MTU_DISCOVER) |
235 |
pcg |
1.1 |
// this I really consider a linux bug. I am neither connected |
236 |
|
|
// nor do I fragment myself. Linux still sets DF and doesn't |
237 |
|
|
// fragment for me sometimes. |
238 |
|
|
{ |
239 |
|
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int oval = IP_PMTUDISC_DONT; |
240 |
pcg |
1.36 |
setsockopt (icmpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval); |
241 |
pcg |
1.1 |
} |
242 |
|
|
#endif |
243 |
|
|
|
244 |
pcg |
1.9 |
sockinfo si (THISNODE, PROT_ICMPv4); |
245 |
|
|
|
246 |
|
|
if (bind (icmpv4_fd, si.sav4 (), si.salenv4 ())) |
247 |
|
|
{ |
248 |
pcg |
1.49 |
slog (L_ERR, _("can't bind icmpv4 on %s: %s, exiting."), (const char *)si, strerror (errno)); |
249 |
pcg |
1.23 |
exit (EXIT_FAILURE); |
250 |
pcg |
1.9 |
} |
251 |
|
|
|
252 |
pcg |
1.39 |
icmpv4_ev_watcher.start (icmpv4_fd, EV_READ); |
253 |
pcg |
1.51 |
++success; |
254 |
pcg |
1.1 |
} |
255 |
pcg |
1.9 |
#endif |
256 |
pcg |
1.1 |
|
257 |
pcg |
1.8 |
tcpv4_fd = -1; |
258 |
|
|
|
259 |
pcg |
1.2 |
#if ENABLE_TCP |
260 |
pcg |
1.8 |
if (THISNODE->protocols & PROT_TCPv4 && THISNODE->tcp_port) |
261 |
pcg |
1.2 |
{ |
262 |
|
|
tcpv4_fd = socket (PF_INET, SOCK_STREAM, IPPROTO_TCP); |
263 |
|
|
|
264 |
|
|
if (tcpv4_fd < 0) |
265 |
|
|
return -1; |
266 |
|
|
|
267 |
pcg |
1.11 |
fcntl (tcpv4_fd, F_SETFL, O_NONBLOCK); |
268 |
pcg |
1.37 |
fcntl (tcpv4_fd, F_SETFD, FD_CLOEXEC); |
269 |
pcg |
1.11 |
|
270 |
pcg |
1.3 |
// standard daemon practise... |
271 |
|
|
{ |
272 |
|
|
int oval = 1; |
273 |
|
|
setsockopt (tcpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval); |
274 |
|
|
} |
275 |
|
|
|
276 |
pcg |
1.2 |
sockinfo si (THISNODE, PROT_TCPv4); |
277 |
|
|
|
278 |
|
|
if (bind (tcpv4_fd, si.sav4 (), si.salenv4 ())) |
279 |
|
|
{ |
280 |
pcg |
1.49 |
slog (L_ERR, _("can't bind tcpv4 on %s: %s, exiting."), (const char *)si, strerror (errno)); |
281 |
pcg |
1.23 |
exit (EXIT_FAILURE); |
282 |
pcg |
1.2 |
} |
283 |
|
|
|
284 |
|
|
if (listen (tcpv4_fd, 5)) |
285 |
|
|
{ |
286 |
pcg |
1.49 |
slog (L_ERR, _("can't listen tcpv4 on %s: %s, exiting."), (const char *)si, strerror (errno)); |
287 |
pcg |
1.23 |
exit (EXIT_FAILURE); |
288 |
pcg |
1.2 |
} |
289 |
|
|
|
290 |
pcg |
1.39 |
tcpv4_ev_watcher.start (tcpv4_fd, EV_READ); |
291 |
pcg |
1.51 |
++success; |
292 |
pcg |
1.2 |
} |
293 |
pcg |
1.51 |
else |
294 |
|
|
THISNODE->protocols &= ~PROT_TCPv4; |
295 |
pcg |
1.2 |
#endif |
296 |
|
|
|
297 |
pcg |
1.41 |
dnsv4_tos = -1; |
298 |
|
|
dnsv4_fd = -1; |
299 |
|
|
|
300 |
pcg |
1.24 |
#if ENABLE_DNS |
301 |
|
|
if (THISNODE->protocols & PROT_DNSv4) |
302 |
|
|
{ |
303 |
pcg |
1.29 |
dns_forwarder.set (::conf.dns_forw_host, ::conf.dns_forw_port, PROT_DNSv4); |
304 |
|
|
|
305 |
pcg |
1.24 |
dnsv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP); |
306 |
|
|
|
307 |
|
|
if (dnsv4_fd < 0) |
308 |
|
|
return -1; |
309 |
|
|
|
310 |
pcg |
1.37 |
fcntl (dnsv4_fd, F_SETFL, O_NONBLOCK); |
311 |
|
|
fcntl (dnsv4_fd, F_SETFD, FD_CLOEXEC); |
312 |
|
|
|
313 |
pcg |
1.35 |
# if defined(SOL_IP) && defined(IP_MTU_DISCOVER) |
314 |
pcg |
1.32 |
// this I really consider a linux bug. I am neither connected |
315 |
|
|
// nor do I fragment myself. Linux still sets DF and doesn't |
316 |
|
|
// fragment for me sometimes. |
317 |
|
|
{ |
318 |
|
|
int oval = IP_PMTUDISC_DONT; |
319 |
pcg |
1.35 |
setsockopt (dnsv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval); |
320 |
pcg |
1.32 |
} |
321 |
pcg |
1.35 |
# endif |
322 |
pcg |
1.32 |
|
323 |
pcg |
1.24 |
// standard daemon practise... |
324 |
|
|
{ |
325 |
|
|
int oval = 1; |
326 |
pcg |
1.31 |
setsockopt (dnsv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval); |
327 |
pcg |
1.24 |
} |
328 |
|
|
|
329 |
pcg |
1.31 |
sockinfo si (THISNODE->dns_hostname, |
330 |
|
|
THISNODE->dns_hostname ? THISNODE->dns_port : 0, |
331 |
|
|
PROT_DNSv4); |
332 |
pcg |
1.24 |
|
333 |
|
|
if (bind (dnsv4_fd, si.sav4 (), si.salenv4 ())) |
334 |
|
|
{ |
335 |
pcg |
1.49 |
slog (L_ERR, _("can't bind dnsv4 on %s: %s, exiting."), (const char *)si, strerror (errno)); |
336 |
pcg |
1.24 |
exit (EXIT_FAILURE); |
337 |
|
|
} |
338 |
|
|
|
339 |
pcg |
1.39 |
dnsv4_ev_watcher.start (dnsv4_fd, EV_READ); |
340 |
pcg |
1.51 |
++success; |
341 |
pcg |
1.24 |
} |
342 |
|
|
#endif |
343 |
|
|
|
344 |
pcg |
1.34 |
///////////////////////////////////////////////////////////////////////////// |
345 |
|
|
|
346 |
pcg |
1.51 |
if (!success) |
347 |
|
|
{ |
348 |
|
|
slog (L_ERR, _("no protocols enabled, exiting.")); |
349 |
|
|
exit (EXIT_FAILURE); |
350 |
|
|
} |
351 |
|
|
|
352 |
pcg |
1.34 |
reconnect_all (); |
353 |
|
|
|
354 |
|
|
///////////////////////////////////////////////////////////////////////////// |
355 |
|
|
|
356 |
pcg |
1.1 |
tap = new tap_device (); |
357 |
|
|
if (!tap) //D this, of course, never catches |
358 |
|
|
{ |
359 |
pcg |
1.49 |
slog (L_ERR, _("cannot create network interface '%s', exiting."), conf.ifname); |
360 |
pcg |
1.23 |
exit (EXIT_FAILURE); |
361 |
pcg |
1.1 |
} |
362 |
|
|
|
363 |
pcg |
1.37 |
fcntl (tap->fd, F_SETFD, FD_CLOEXEC); |
364 |
|
|
|
365 |
pcg |
1.43 |
run_script_cb cb; |
366 |
pcg |
1.44 |
cb.set<vpn, &vpn::script_if_init> (this); |
367 |
pcg |
1.43 |
|
368 |
pcg |
1.33 |
if (tap->if_up () && |
369 |
pcg |
1.43 |
!run_script (cb, true)) |
370 |
pcg |
1.33 |
{ |
371 |
|
|
slog (L_ERR, _("interface initialization command '%s' failed, exiting."), |
372 |
|
|
tap->if_up ()); |
373 |
|
|
exit (EXIT_FAILURE); |
374 |
|
|
} |
375 |
|
|
|
376 |
pcg |
1.44 |
cb.set<vpn, &vpn::script_if_up> (this); |
377 |
pcg |
1.43 |
if (!run_script (cb, true)) |
378 |
pcg |
1.33 |
{ |
379 |
|
|
slog (L_ERR, _("if-up command execution failed, exiting.")); |
380 |
|
|
exit (EXIT_FAILURE); |
381 |
|
|
} |
382 |
pcg |
1.1 |
|
383 |
pcg |
1.39 |
tap_ev_watcher.start (tap->fd, EV_READ); |
384 |
pcg |
1.1 |
|
385 |
|
|
return 0; |
386 |
|
|
} |
387 |
|
|
|
388 |
pcg |
1.7 |
bool |
389 |
pcg |
1.1 |
vpn::send_ipv4_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
390 |
|
|
{ |
391 |
pcg |
1.41 |
set_tos (ipv4_fd, ipv4_tos, tos); |
392 |
pcg |
1.1 |
sendto (ipv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ()); |
393 |
pcg |
1.7 |
|
394 |
|
|
return true; |
395 |
pcg |
1.1 |
} |
396 |
|
|
|
397 |
pcg |
1.9 |
static u16 |
398 |
|
|
ipv4_checksum (u16 *data, unsigned int len) |
399 |
|
|
{ |
400 |
|
|
// use 32 bit accumulator and fold back carry bits at the end |
401 |
|
|
u32 sum = 0; |
402 |
|
|
|
403 |
|
|
while (len > 1) |
404 |
|
|
{ |
405 |
|
|
sum += *data++; |
406 |
|
|
len -= 2; |
407 |
|
|
} |
408 |
|
|
|
409 |
|
|
// odd byte left? |
410 |
|
|
if (len) |
411 |
|
|
sum += *(u8 *)data; |
412 |
|
|
|
413 |
|
|
// add back carry bits |
414 |
|
|
sum = (sum >> 16) + (sum & 0xffff); // lo += hi |
415 |
|
|
sum += (sum >> 16); // carry |
416 |
|
|
|
417 |
|
|
return ~sum; |
418 |
|
|
} |
419 |
|
|
|
420 |
pcg |
1.13 |
#if ENABLE_ICMP |
421 |
pcg |
1.9 |
bool |
422 |
|
|
vpn::send_icmpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
423 |
|
|
{ |
424 |
|
|
pkt->unshift_hdr (4); |
425 |
|
|
|
426 |
pcg |
1.14 |
icmp_header *hdr = (icmp_header *)&((*pkt)[0]); |
427 |
pcg |
1.9 |
hdr->type = ::conf.icmp_type; |
428 |
|
|
hdr->code = 255; |
429 |
|
|
hdr->checksum = 0; |
430 |
|
|
hdr->checksum = ipv4_checksum ((u16 *)hdr, pkt->len); |
431 |
|
|
|
432 |
pcg |
1.41 |
set_tos (icmpv4_fd, icmpv4_tos, tos); |
433 |
pcg |
1.9 |
sendto (icmpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ()); |
434 |
|
|
|
435 |
|
|
return true; |
436 |
|
|
} |
437 |
pcg |
1.13 |
#endif |
438 |
pcg |
1.9 |
|
439 |
pcg |
1.7 |
bool |
440 |
pcg |
1.1 |
vpn::send_udpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
441 |
|
|
{ |
442 |
pcg |
1.41 |
set_tos (udpv4_fd, udpv4_tos, tos); |
443 |
pcg |
1.1 |
sendto (udpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ()); |
444 |
pcg |
1.7 |
|
445 |
|
|
return true; |
446 |
pcg |
1.1 |
} |
447 |
|
|
|
448 |
|
|
void |
449 |
pcg |
1.18 |
vpn::inject_data_packet (tap_packet *pkt, int dst) |
450 |
|
|
{ |
451 |
|
|
if (dst) |
452 |
|
|
{ |
453 |
|
|
// unicast |
454 |
|
|
if (dst != THISNODE->id) |
455 |
|
|
conns[dst - 1]->inject_data_packet (pkt); |
456 |
|
|
} |
457 |
|
|
else |
458 |
|
|
{ |
459 |
|
|
// broadcast, this is ugly, but due to the security policy |
460 |
|
|
// we have to connect to all hosts... |
461 |
|
|
for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c) |
462 |
|
|
if ((*c)->conf != THISNODE) |
463 |
pcg |
1.46 |
(*c)->inject_data_packet (pkt); |
464 |
pcg |
1.18 |
} |
465 |
|
|
} |
466 |
|
|
|
467 |
|
|
void |
468 |
pcg |
1.1 |
vpn::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi) |
469 |
|
|
{ |
470 |
|
|
unsigned int src = pkt->src (); |
471 |
|
|
unsigned int dst = pkt->dst (); |
472 |
|
|
|
473 |
pcg |
1.49 |
slog (L_NOISE, _("<<?/%s received possible vpn packet type %d from %d to %d, length %d."), |
474 |
pcg |
1.1 |
(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst (), pkt->len); |
475 |
|
|
|
476 |
|
|
if (src == 0 || src > conns.size () |
477 |
|
|
|| dst > conns.size () |
478 |
|
|
|| pkt->typ () >= vpn_packet::PT_MAX) |
479 |
pcg |
1.49 |
slog (L_WARN, _("(%s): received corrupted packet type %d (src %d, dst %d)."), |
480 |
pcg |
1.1 |
(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ()); |
481 |
pcg |
1.6 |
else if (dst > conns.size ()) |
482 |
pcg |
1.49 |
slog (L_WARN, _("(%s): received corrupted packet type %d (src %d, dst %d)."), |
483 |
pcg |
1.6 |
(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ()); |
484 |
pcg |
1.1 |
else |
485 |
|
|
{ |
486 |
|
|
connection *c = conns[src - 1]; |
487 |
|
|
|
488 |
pcg |
1.13 |
if (dst == 0) |
489 |
pcg |
1.49 |
slog (L_WARN, _("%s(%s): received broadcast (protocol violation)."), |
490 |
pcg |
1.1 |
c->conf->nodename, (const char *)rsi); |
491 |
pcg |
1.18 |
else if (dst != THISNODE->id) |
492 |
pcg |
1.6 |
{ |
493 |
|
|
if (THISNODE->routerprio) |
494 |
|
|
// the tos setting gets lost here. who cares. |
495 |
|
|
conns[dst - 1]->inject_vpn_packet (pkt); |
496 |
|
|
else |
497 |
|
|
slog (L_WARN, |
498 |
pcg |
1.49 |
_("%s(%s): request to forward packet to %s, but we are no router (config mismatch?)."), |
499 |
pcg |
1.6 |
c->conf->nodename, (const char *)rsi, |
500 |
|
|
conns[dst - 1]->conf->nodename); |
501 |
|
|
} |
502 |
pcg |
1.1 |
else |
503 |
|
|
c->recv_vpn_packet (pkt, rsi); |
504 |
|
|
} |
505 |
|
|
} |
506 |
|
|
|
507 |
pcg |
1.31 |
bool |
508 |
|
|
vpn::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
509 |
|
|
{ |
510 |
|
|
switch (si.prot) |
511 |
|
|
{ |
512 |
|
|
case PROT_IPv4: |
513 |
|
|
return send_ipv4_packet (pkt, si, tos); |
514 |
pcg |
1.41 |
|
515 |
pcg |
1.31 |
case PROT_UDPv4: |
516 |
|
|
return send_udpv4_packet (pkt, si, tos); |
517 |
pcg |
1.41 |
|
518 |
pcg |
1.31 |
#if ENABLE_TCP |
519 |
|
|
case PROT_TCPv4: |
520 |
|
|
return send_tcpv4_packet (pkt, si, tos); |
521 |
|
|
#endif |
522 |
|
|
#if ENABLE_ICMP |
523 |
|
|
case PROT_ICMPv4: |
524 |
|
|
return send_icmpv4_packet (pkt, si, tos); |
525 |
|
|
#endif |
526 |
|
|
#if ENABLE_DNS |
527 |
|
|
case PROT_DNSv4: |
528 |
|
|
return send_dnsv4_packet (pkt, si, tos); |
529 |
|
|
#endif |
530 |
|
|
default: |
531 |
pcg |
1.49 |
slog (L_CRIT, _("%s: FATAL: trying to send packet with unsupported protocol."), (const char *)si); |
532 |
pcg |
1.31 |
} |
533 |
|
|
|
534 |
|
|
return false; |
535 |
|
|
} |
536 |
|
|
|
537 |
pcg |
1.45 |
inline void |
538 |
pcg |
1.39 |
vpn::ipv4_ev (ev::io &w, int revents) |
539 |
pcg |
1.1 |
{ |
540 |
pcg |
1.39 |
if (revents & EV_READ) |
541 |
pcg |
1.1 |
{ |
542 |
|
|
vpn_packet *pkt = new vpn_packet; |
543 |
|
|
struct sockaddr_in sa; |
544 |
|
|
socklen_t sa_len = sizeof (sa); |
545 |
|
|
int len; |
546 |
|
|
|
547 |
pcg |
1.5 |
len = recvfrom (w.fd, &((*pkt)[0]), MAXSIZE, 0, (sockaddr *)&sa, &sa_len); |
548 |
pcg |
1.1 |
|
549 |
pcg |
1.9 |
sockinfo si(sa, PROT_IPv4); |
550 |
pcg |
1.1 |
|
551 |
|
|
if (len > 0) |
552 |
|
|
{ |
553 |
|
|
pkt->len = len; |
554 |
|
|
|
555 |
pcg |
1.30 |
// raw sockets deliver the ipv4 header, but don't expect it on sends |
556 |
pcg |
1.9 |
pkt->skip_hdr (IP_OVERHEAD); |
557 |
|
|
|
558 |
pcg |
1.1 |
recv_vpn_packet (pkt, si); |
559 |
|
|
} |
560 |
|
|
else |
561 |
|
|
{ |
562 |
|
|
// probably ECONNRESET or somesuch |
563 |
pcg |
1.49 |
slog (L_DEBUG, _("%s: %s."), (const char *)si, strerror (errno)); |
564 |
pcg |
1.1 |
} |
565 |
|
|
|
566 |
|
|
delete pkt; |
567 |
|
|
} |
568 |
|
|
else |
569 |
|
|
{ |
570 |
|
|
slog (L_ERR, |
571 |
pcg |
1.49 |
_("FATAL: unknown revents %08x in socket, exiting.\n"), |
572 |
pcg |
1.30 |
revents); |
573 |
pcg |
1.23 |
exit (EXIT_FAILURE); |
574 |
pcg |
1.1 |
} |
575 |
|
|
} |
576 |
|
|
|
577 |
pcg |
1.13 |
#if ENABLE_ICMP |
578 |
pcg |
1.45 |
inline void |
579 |
pcg |
1.39 |
vpn::icmpv4_ev (ev::io &w, int revents) |
580 |
pcg |
1.1 |
{ |
581 |
pcg |
1.39 |
if (revents & EV_READ) |
582 |
pcg |
1.1 |
{ |
583 |
|
|
vpn_packet *pkt = new vpn_packet; |
584 |
|
|
struct sockaddr_in sa; |
585 |
|
|
socklen_t sa_len = sizeof (sa); |
586 |
|
|
int len; |
587 |
|
|
|
588 |
pcg |
1.5 |
len = recvfrom (w.fd, &((*pkt)[0]), MAXSIZE, 0, (sockaddr *)&sa, &sa_len); |
589 |
pcg |
1.1 |
|
590 |
pcg |
1.9 |
sockinfo si(sa, PROT_ICMPv4); |
591 |
pcg |
1.1 |
|
592 |
|
|
if (len > 0) |
593 |
|
|
{ |
594 |
|
|
pkt->len = len; |
595 |
|
|
|
596 |
pcg |
1.14 |
icmp_header *hdr = (icmp_header *)&((*pkt)[IP_OVERHEAD]); |
597 |
pcg |
1.9 |
|
598 |
|
|
if (hdr->type == ::conf.icmp_type |
599 |
|
|
&& hdr->code == 255) |
600 |
|
|
{ |
601 |
|
|
// raw sockets deliver the ipv4, but don't expect it on sends |
602 |
|
|
// this is slow, but... |
603 |
|
|
pkt->skip_hdr (ICMP_OVERHEAD); |
604 |
|
|
|
605 |
|
|
recv_vpn_packet (pkt, si); |
606 |
|
|
} |
607 |
|
|
} |
608 |
|
|
else |
609 |
|
|
{ |
610 |
|
|
// probably ECONNRESET or somesuch |
611 |
pcg |
1.49 |
slog (L_DEBUG, _("%s: %s."), (const char *)si, strerror (errno)); |
612 |
pcg |
1.9 |
} |
613 |
|
|
|
614 |
|
|
delete pkt; |
615 |
|
|
} |
616 |
|
|
else |
617 |
|
|
{ |
618 |
|
|
slog (L_ERR, |
619 |
pcg |
1.49 |
_("FATAL: unknown revents %08x in socket, exiting.\n"), |
620 |
pcg |
1.9 |
revents); |
621 |
pcg |
1.23 |
exit (EXIT_FAILURE); |
622 |
pcg |
1.9 |
} |
623 |
|
|
} |
624 |
pcg |
1.13 |
#endif |
625 |
pcg |
1.9 |
|
626 |
pcg |
1.45 |
inline void |
627 |
pcg |
1.39 |
vpn::udpv4_ev (ev::io &w, int revents) |
628 |
pcg |
1.9 |
{ |
629 |
pcg |
1.39 |
if (revents & EV_READ) |
630 |
pcg |
1.9 |
{ |
631 |
|
|
vpn_packet *pkt = new vpn_packet; |
632 |
|
|
struct sockaddr_in sa; |
633 |
|
|
socklen_t sa_len = sizeof (sa); |
634 |
|
|
int len; |
635 |
|
|
|
636 |
|
|
len = recvfrom (w.fd, &((*pkt)[0]), MAXSIZE, 0, (sockaddr *)&sa, &sa_len); |
637 |
|
|
|
638 |
|
|
sockinfo si(sa, PROT_UDPv4); |
639 |
|
|
|
640 |
|
|
if (len > 0) |
641 |
|
|
{ |
642 |
|
|
pkt->len = len; |
643 |
pcg |
1.1 |
|
644 |
|
|
recv_vpn_packet (pkt, si); |
645 |
|
|
} |
646 |
|
|
else |
647 |
|
|
{ |
648 |
|
|
// probably ECONNRESET or somesuch |
649 |
pcg |
1.49 |
slog (L_DEBUG, _("%s: fd %d, %s."), (const char *)si, w.fd, strerror (errno)); |
650 |
pcg |
1.1 |
} |
651 |
|
|
|
652 |
|
|
delete pkt; |
653 |
|
|
} |
654 |
|
|
else |
655 |
|
|
{ |
656 |
|
|
slog (L_ERR, |
657 |
pcg |
1.49 |
_("FATAL: unknown revents %08x in socket, exiting.\n"), |
658 |
pcg |
1.1 |
revents); |
659 |
pcg |
1.23 |
exit (EXIT_FAILURE); |
660 |
pcg |
1.1 |
} |
661 |
|
|
} |
662 |
pcg |
1.2 |
|
663 |
pcg |
1.45 |
inline void |
664 |
pcg |
1.39 |
vpn::tap_ev (ev::io &w, int revents) |
665 |
pcg |
1.1 |
{ |
666 |
pcg |
1.39 |
if (revents & EV_READ) |
667 |
pcg |
1.1 |
{ |
668 |
|
|
/* process data */ |
669 |
|
|
tap_packet *pkt; |
670 |
|
|
|
671 |
|
|
pkt = tap->recv (); |
672 |
|
|
|
673 |
pcg |
1.17 |
if (!pkt) |
674 |
|
|
return; |
675 |
pcg |
1.1 |
|
676 |
pcg |
1.17 |
if (pkt->len > 14) |
677 |
pcg |
1.1 |
{ |
678 |
pcg |
1.17 |
int dst = mac2id (pkt->dst); |
679 |
|
|
int src = mac2id (pkt->src); |
680 |
pcg |
1.1 |
|
681 |
pcg |
1.17 |
if (src != THISNODE->id) |
682 |
|
|
{ |
683 |
pcg |
1.30 |
slog (L_ERR, _("FATAL: tap packet not originating on current node received (if-up script not working properly?), exiting.")); |
684 |
pcg |
1.23 |
exit (EXIT_FAILURE); |
685 |
pcg |
1.17 |
} |
686 |
pcg |
1.1 |
|
687 |
pcg |
1.17 |
if (dst == THISNODE->id) |
688 |
pcg |
1.1 |
{ |
689 |
pcg |
1.17 |
slog (L_ERR, _("FATAL: tap packet destined for current node received, exiting.")); |
690 |
pcg |
1.23 |
exit (EXIT_FAILURE); |
691 |
pcg |
1.1 |
} |
692 |
pcg |
1.17 |
|
693 |
|
|
if (dst > conns.size ()) |
694 |
|
|
slog (L_ERR, _("tap packet for unknown node %d received, ignoring."), dst); |
695 |
pcg |
1.1 |
else |
696 |
pcg |
1.18 |
inject_data_packet (pkt, dst); |
697 |
pcg |
1.1 |
} |
698 |
|
|
|
699 |
|
|
delete pkt; |
700 |
|
|
} |
701 |
|
|
else |
702 |
|
|
abort (); |
703 |
|
|
} |
704 |
|
|
|
705 |
pcg |
1.45 |
inline void |
706 |
pcg |
1.39 |
vpn::event_cb (ev::timer &w, int) |
707 |
pcg |
1.1 |
{ |
708 |
|
|
if (events) |
709 |
|
|
{ |
710 |
|
|
if (events & EVENT_SHUTDOWN) |
711 |
|
|
{ |
712 |
|
|
slog (L_INFO, _("preparing shutdown...")); |
713 |
|
|
|
714 |
|
|
shutdown_all (); |
715 |
pcg |
1.24 |
remove_pid (conf.pidfilename); |
716 |
pcg |
1.49 |
slog (L_INFO, _("exiting.")); |
717 |
pcg |
1.23 |
exit (EXIT_SUCCESS); |
718 |
pcg |
1.1 |
} |
719 |
|
|
|
720 |
|
|
if (events & EVENT_RECONNECT) |
721 |
|
|
{ |
722 |
pcg |
1.49 |
slog (L_INFO, _("forced reconnect.")); |
723 |
pcg |
1.1 |
|
724 |
|
|
reconnect_all (); |
725 |
|
|
} |
726 |
|
|
|
727 |
|
|
events = 0; |
728 |
|
|
} |
729 |
|
|
} |
730 |
|
|
|
731 |
|
|
void |
732 |
|
|
vpn::shutdown_all () |
733 |
|
|
{ |
734 |
|
|
for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c) |
735 |
|
|
(*c)->shutdown (); |
736 |
|
|
} |
737 |
|
|
|
738 |
|
|
void |
739 |
|
|
vpn::reconnect_all () |
740 |
|
|
{ |
741 |
|
|
for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c) |
742 |
|
|
delete *c; |
743 |
|
|
|
744 |
|
|
conns.clear (); |
745 |
|
|
|
746 |
|
|
connection_init (); |
747 |
|
|
|
748 |
pcg |
1.50 |
for (configuration::node_vector::iterator i = conf.nodes.begin (); i != conf.nodes.end (); ++i) |
749 |
|
|
conns.push_back (new connection (this, *i)); |
750 |
|
|
|
751 |
|
|
for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c) |
752 |
|
|
(*c)->establish_connection (); |
753 |
pcg |
1.1 |
} |
754 |
|
|
|
755 |
pcg |
1.49 |
bool vpn::can_direct (conf_node *src, conf_node *dst) const |
756 |
|
|
{ |
757 |
|
|
return src != dst |
758 |
|
|
&& src->may_direct (dst) |
759 |
|
|
&& dst->may_direct (src) |
760 |
|
|
&& (((src->protocols & dst->protocols) && src->connectmode == conf_node::C_ALWAYS) |
761 |
|
|
|| (src->protocols & dst->connectable_protocols ())); |
762 |
|
|
} |
763 |
|
|
|
764 |
|
|
// only works for indirect and routed connections: find a router |
765 |
|
|
// from THISNODE to dst |
766 |
|
|
connection *vpn::find_router_for (const connection *dst) |
767 |
pcg |
1.1 |
{ |
768 |
|
|
connection *router = 0; |
769 |
|
|
|
770 |
pcg |
1.52 |
// first try to find a router with a direct connection, route there |
771 |
|
|
// regardless of any other considerations. |
772 |
pcg |
1.49 |
{ |
773 |
|
|
u32 prio = 1; |
774 |
|
|
|
775 |
|
|
for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i) |
776 |
|
|
{ |
777 |
|
|
connection *c = *i; |
778 |
|
|
|
779 |
|
|
if (c->conf->routerprio > prio |
780 |
|
|
&& c->conf != THISNODE |
781 |
pcg |
1.52 |
&& can_direct (c->conf, dst->conf) |
782 |
|
|
&& c->ictx && c->octx) |
783 |
pcg |
1.49 |
{ |
784 |
pcg |
1.52 |
prio = c->conf->routerprio; |
785 |
|
|
router = c; |
786 |
pcg |
1.49 |
} |
787 |
|
|
} |
788 |
|
|
} |
789 |
|
|
|
790 |
|
|
if (router) |
791 |
|
|
return router; |
792 |
|
|
|
793 |
pcg |
1.52 |
// second try find the router with the highest priority, higher than ours |
794 |
pcg |
1.49 |
{ |
795 |
pcg |
1.52 |
u32 prio = THISNODE->routerprio ? THISNODE->routerprio : 1; |
796 |
pcg |
1.49 |
|
797 |
|
|
for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i) |
798 |
|
|
{ |
799 |
|
|
connection *c = *i; |
800 |
|
|
|
801 |
|
|
if (c->conf->routerprio > prio |
802 |
|
|
&& c != dst |
803 |
pcg |
1.52 |
&& c->conf != THISNODE |
804 |
|
|
&& c->ictx && c->octx) |
805 |
pcg |
1.49 |
{ |
806 |
pcg |
1.52 |
prio = c->conf->routerprio; |
807 |
|
|
router = c; |
808 |
pcg |
1.49 |
} |
809 |
|
|
} |
810 |
|
|
} |
811 |
pcg |
1.52 |
|
812 |
pcg |
1.49 |
return router; |
813 |
|
|
} |
814 |
|
|
|
815 |
|
|
void vpn::connection_established (connection *c) |
816 |
|
|
{ |
817 |
pcg |
1.1 |
for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i) |
818 |
|
|
{ |
819 |
pcg |
1.49 |
connection *o = *i; |
820 |
pcg |
1.1 |
|
821 |
pcg |
1.49 |
if (!o->is_direct |
822 |
|
|
&& o->si.valid () |
823 |
|
|
&& c->si != o->si |
824 |
|
|
&& c == find_router_for (o)) |
825 |
|
|
{ |
826 |
|
|
slog (L_DEBUG, _("%s: can now route packets via %s, re-keying connection."), |
827 |
|
|
o->conf->nodename, c->conf->nodename); |
828 |
|
|
o->rekey (); |
829 |
pcg |
1.1 |
} |
830 |
|
|
} |
831 |
|
|
} |
832 |
|
|
|
833 |
pcg |
1.50 |
void vpn::send_connect_request (connection *c) |
834 |
pcg |
1.1 |
{ |
835 |
pcg |
1.50 |
connection *r = find_router_for (c); |
836 |
pcg |
1.1 |
|
837 |
pcg |
1.50 |
if (r) |
838 |
pcg |
1.49 |
{ |
839 |
pcg |
1.53 |
slog (L_TRACE, _("%s: no address known, sending mediated connection request via %s."), |
840 |
pcg |
1.50 |
c->conf->nodename, r->conf->nodename); |
841 |
|
|
r->send_connect_request (c->conf->id); |
842 |
pcg |
1.49 |
} |
843 |
pcg |
1.7 |
else |
844 |
pcg |
1.53 |
slog (L_DEBUG, _("%s: no way to connect and no router found: unable to connect at this time."), |
845 |
pcg |
1.50 |
c->conf->nodename); |
846 |
pcg |
1.1 |
} |
847 |
|
|
|
848 |
|
|
void |
849 |
|
|
connection::dump_status () |
850 |
|
|
{ |
851 |
|
|
slog (L_NOTICE, _("node %s (id %d)"), conf->nodename, conf->id); |
852 |
|
|
slog (L_NOTICE, _(" connectmode %d (%d) / sockaddr %s / minor %d"), |
853 |
|
|
connectmode, conf->connectmode, (const char *)si, (int)prot_minor); |
854 |
|
|
slog (L_NOTICE, _(" ictx/octx %08lx/%08lx / oseqno %d / retry_cnt %d"), |
855 |
|
|
(long)ictx, (long)octx, (int)oseqno, (int)retry_cnt); |
856 |
|
|
} |
857 |
|
|
|
858 |
|
|
void |
859 |
|
|
vpn::dump_status () |
860 |
|
|
{ |
861 |
pcg |
1.40 |
slog (L_NOTICE, _("BEGIN status dump (%ld)"), (long)ev_now ()); |
862 |
pcg |
1.1 |
|
863 |
|
|
for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c) |
864 |
|
|
(*c)->dump_status (); |
865 |
|
|
|
866 |
|
|
slog (L_NOTICE, _("END status dump")); |
867 |
|
|
} |
868 |
|
|
|
869 |
|
|
vpn::vpn (void) |
870 |
pcg |
1.44 |
{ |
871 |
|
|
event .set<vpn, &vpn::event_cb > (this); |
872 |
|
|
udpv4_ev_watcher .set<vpn, &vpn::udpv4_ev > (this); |
873 |
|
|
ipv4_ev_watcher .set<vpn, &vpn::ipv4_ev > (this); |
874 |
pcg |
1.2 |
#if ENABLE_TCP |
875 |
pcg |
1.44 |
tcpv4_ev_watcher .set<vpn, &vpn::tcpv4_ev > (this); |
876 |
pcg |
1.9 |
#endif |
877 |
|
|
#if ENABLE_ICMP |
878 |
pcg |
1.44 |
icmpv4_ev_watcher.set<vpn, &vpn::icmpv4_ev> (this); |
879 |
pcg |
1.24 |
#endif |
880 |
|
|
#if ENABLE_DNS |
881 |
pcg |
1.44 |
dnsv4_ev_watcher .set<vpn, &vpn::dnsv4_ev > (this); |
882 |
pcg |
1.2 |
#endif |
883 |
pcg |
1.44 |
tap_ev_watcher .set<vpn, &vpn::tap_ev > (this); |
884 |
pcg |
1.1 |
} |
885 |
|
|
|
886 |
|
|
vpn::~vpn () |
887 |
|
|
{ |
888 |
|
|
} |
889 |
|
|
|