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) 2003-2008 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 it |
5 | it under the terms of the GNU General Public License as published by |
8 | under the terms of the GNU General Public License as published by the |
6 | the Free Software Foundation; either version 2 of the License, or |
9 | Free Software Foundation; either version 3 of the License, or (at your |
7 | (at your option) any later version. |
10 | 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, but |
10 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
13 | 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 GNU General |
12 | GNU General Public License for more details. |
15 | 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 along |
15 | along with this program; if not, write to the Free Software |
18 | with this program; if not, see <http://www.gnu.org/licenses/>. |
16 | Foundation, Inc. 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
19 | |
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20 | Additional permission under GNU GPL version 3 section 7 |
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21 | |
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22 | If you modify this Program, or any covered work, by linking or |
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23 | combining it with the OpenSSL project's OpenSSL library (or a modified |
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24 | version of that library), containing parts covered by the terms of the |
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25 | OpenSSL or SSLeay licenses, the licensors of this Program grant you |
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26 | additional permission to convey the resulting work. Corresponding |
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27 | Source for a non-source form of such a combination shall include the |
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28 | source code for the parts of OpenSSL used as well as that of the |
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29 | covered work. |
17 | */ |
30 | */ |
18 | |
31 | |
19 | #include "config.h" |
32 | #include "config.h" |
20 | |
33 | |
21 | #include <list> |
34 | #include <list> |
22 | |
35 | |
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36 | #include <cstdio> |
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37 | #include <cstring> |
23 | #include <cstdlib> |
38 | #include <cstdlib> |
24 | #include <cstring> |
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25 | #include <cstdio> |
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26 | |
39 | |
27 | #include <sys/types.h> |
40 | #include <sys/types.h> |
28 | #include <sys/socket.h> |
41 | #include <sys/socket.h> |
29 | #include <sys/poll.h> |
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30 | #include <sys/wait.h> |
42 | #include <sys/wait.h> |
31 | #include <errno.h> |
43 | #include <errno.h> |
32 | #include <time.h> |
44 | #include <time.h> |
33 | #include <unistd.h> |
45 | #include <unistd.h> |
34 | #include <fcntl.h> |
46 | #include <fcntl.h> |
… | |
… | |
40 | |
52 | |
41 | #include "connection.h" |
53 | #include "connection.h" |
42 | #include "util.h" |
54 | #include "util.h" |
43 | #include "vpn.h" |
55 | #include "vpn.h" |
44 | |
56 | |
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57 | vpn network; // THE vpn (bad design...) |
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58 | |
45 | ///////////////////////////////////////////////////////////////////////////// |
59 | ///////////////////////////////////////////////////////////////////////////// |
46 | |
60 | |
47 | const char *vpn::script_if_up () |
61 | static void inline |
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62 | set_tos (int fd, int &tos_prev, int tos) |
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63 | { |
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64 | #if defined(SOL_IP) && defined(IP_TOS) |
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65 | if (tos_prev == tos) |
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66 | return; |
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67 | |
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68 | tos_prev = tos; |
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69 | setsockopt (fd, SOL_IP, IP_TOS, &tos, sizeof tos); |
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70 | #endif |
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71 | } |
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72 | |
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73 | void |
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74 | vpn::script_init_env () |
48 | { |
75 | { |
49 | // the tunnel device mtu should be the physical mtu - overhead |
76 | // the tunnel device mtu should be the physical mtu - overhead |
50 | // the tricky part is rounding to the cipher key blocksize |
77 | // the tricky part is rounding to the cipher key blocksize |
51 | int mtu = conf.mtu - ETH_OVERHEAD - VPE_OVERHEAD - MAX_OVERHEAD; |
78 | int mtu = conf.mtu - ETH_OVERHEAD - VPE_OVERHEAD - MAX_OVERHEAD; |
52 | mtu += ETH_OVERHEAD - 6 - 6; // now we have the data portion |
79 | mtu += ETH_OVERHEAD - 6 - 6; // now we have the data portion |
53 | mtu -= mtu % EVP_CIPHER_block_size (CIPHER); // round |
80 | mtu -= mtu % EVP_CIPHER_block_size (CIPHER); // round |
54 | mtu -= ETH_OVERHEAD - 6 - 6; // and get interface mtu again |
81 | mtu -= ETH_OVERHEAD - 6 - 6; // and get interface mtu again |
55 | |
82 | |
56 | char *env; |
83 | char *env; |
57 | asprintf (&env, "CONFBASE=%s", confbase); |
84 | 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 ()); |
85 | asprintf (&env, "IFNAME=%s", tap->interface ()); putenv (env); |
64 | putenv (env); |
86 | asprintf (&env, "IFTYPE=%s", IFTYPE); putenv (env); |
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87 | asprintf (&env, "IFSUBTYPE=%s", IFSUBTYPE); putenv (env); |
65 | asprintf (&env, "MTU=%d", mtu); |
88 | asprintf (&env, "MTU=%d", mtu); putenv (env); |
66 | putenv (env); |
89 | asprintf (&env, "NODES=%d", conns.size ()); putenv (env); |
67 | asprintf (&env, "MAC=%02x:%02x:%02x:%02x:%02x:%02x", |
90 | 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 | |
91 | |
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92 | conns [THISNODE->id - 1]->script_init_env (""); |
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93 | |
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94 | for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c) |
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95 | { |
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96 | char ext[16]; |
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97 | snprintf (ext, 16, "_%d", (*c)->conf->id); |
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98 | (*c)->script_init_env (ext); |
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99 | } |
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100 | } |
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101 | |
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102 | inline const char * |
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103 | vpn::script_if_init () |
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104 | { |
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105 | script_init_env (); |
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106 | |
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107 | return tap->if_up (); |
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108 | } |
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109 | |
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110 | inline const char * |
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111 | vpn::script_if_up () |
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112 | { |
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113 | script_init_env (); |
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114 | |
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115 | char *filename; |
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116 | asprintf (&filename, |
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117 | "%s/%s", |
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118 | confbase, |
72 | return ::conf.script_if_up ? ::conf.script_if_up : "if-up"; |
119 | ::conf.script_if_up ? ::conf.script_if_up : "if-up"); |
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120 | |
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121 | return filename; |
73 | } |
122 | } |
74 | |
123 | |
75 | int |
124 | int |
76 | vpn::setup () |
125 | vpn::setup () |
77 | { |
126 | { |
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127 | ipv4_tos = -1; |
78 | ipv4_fd = -1; |
128 | ipv4_fd = -1; |
79 | |
129 | |
80 | if (THISNODE->protocols & PROT_IPv4 && ::conf.ip_proto) |
130 | if (THISNODE->protocols & PROT_IPv4 && ::conf.ip_proto) |
81 | { |
131 | { |
82 | ipv4_fd = socket (PF_INET, SOCK_RAW, ::conf.ip_proto); |
132 | ipv4_fd = socket (PF_INET, SOCK_RAW, ::conf.ip_proto); |
83 | |
133 | |
84 | if (ipv4_fd < 0) |
134 | if (ipv4_fd < 0) |
85 | return -1; |
135 | return -1; |
86 | |
136 | |
87 | fcntl (ipv4_fd, F_SETFL, O_NONBLOCK); |
137 | fcntl (ipv4_fd, F_SETFL, O_NONBLOCK); |
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138 | fcntl (ipv4_fd, F_SETFD, FD_CLOEXEC); |
88 | |
139 | |
89 | #if defined(SOL_IP) && defined(IP_MTU_DISCOVER) |
140 | #if defined(SOL_IP) && defined(IP_MTU_DISCOVER) |
90 | // this I really consider a linux bug. I am neither connected |
141 | // this I really consider a linux bug. I am neither connected |
91 | // nor do I fragment myself. Linux still sets DF and doesn't |
142 | // nor do I fragment myself. Linux still sets DF and doesn't |
92 | // fragment for me sometimes. |
143 | // fragment for me sometimes. |
… | |
… | |
99 | sockinfo si (THISNODE, PROT_IPv4); |
150 | sockinfo si (THISNODE, PROT_IPv4); |
100 | |
151 | |
101 | if (bind (ipv4_fd, si.sav4 (), si.salenv4 ())) |
152 | if (bind (ipv4_fd, si.sav4 (), si.salenv4 ())) |
102 | { |
153 | { |
103 | slog (L_ERR, _("can't bind ipv4 socket on %s: %s"), (const char *)si, strerror (errno)); |
154 | slog (L_ERR, _("can't bind ipv4 socket on %s: %s"), (const char *)si, strerror (errno)); |
104 | exit (1); |
155 | exit (EXIT_FAILURE); |
105 | } |
156 | } |
106 | |
157 | |
107 | ipv4_ev_watcher.start (ipv4_fd, POLLIN); |
158 | ipv4_ev_watcher.start (ipv4_fd, EV_READ); |
108 | } |
159 | } |
109 | |
160 | |
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161 | udpv4_tos = -1; |
110 | udpv4_fd = -1; |
162 | udpv4_fd = -1; |
111 | |
163 | |
112 | if (THISNODE->protocols & PROT_UDPv4 && THISNODE->udp_port) |
164 | if (THISNODE->protocols & PROT_UDPv4 && THISNODE->udp_port) |
113 | { |
165 | { |
114 | udpv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP); |
166 | udpv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP); |
115 | |
167 | |
116 | if (udpv4_fd < 0) |
168 | if (udpv4_fd < 0) |
117 | return -1; |
169 | return -1; |
118 | |
170 | |
119 | fcntl (udpv4_fd, F_SETFL, O_NONBLOCK); |
171 | fcntl (udpv4_fd, F_SETFL, O_NONBLOCK); |
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172 | fcntl (udpv4_fd, F_SETFD, FD_CLOEXEC); |
120 | |
173 | |
121 | // standard daemon practise... |
174 | // standard daemon practise... |
122 | { |
175 | { |
123 | int oval = 1; |
176 | int oval = 1; |
124 | setsockopt (udpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval); |
177 | setsockopt (udpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval); |
… | |
… | |
137 | sockinfo si (THISNODE, PROT_UDPv4); |
190 | sockinfo si (THISNODE, PROT_UDPv4); |
138 | |
191 | |
139 | if (bind (udpv4_fd, si.sav4 (), si.salenv4 ())) |
192 | if (bind (udpv4_fd, si.sav4 (), si.salenv4 ())) |
140 | { |
193 | { |
141 | slog (L_ERR, _("can't bind udpv4 on %s: %s"), (const char *)si, strerror (errno)); |
194 | slog (L_ERR, _("can't bind udpv4 on %s: %s"), (const char *)si, strerror (errno)); |
142 | exit (1); |
195 | exit (EXIT_FAILURE); |
143 | } |
196 | } |
144 | |
197 | |
145 | udpv4_ev_watcher.start (udpv4_fd, POLLIN); |
198 | udpv4_ev_watcher.start (udpv4_fd, EV_READ); |
146 | } |
199 | } |
147 | |
200 | |
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201 | icmpv4_tos = -1; |
148 | icmpv4_fd = -1; |
202 | icmpv4_fd = -1; |
149 | |
203 | |
150 | #if ENABLE_ICMP |
204 | #if ENABLE_ICMP |
151 | if (THISNODE->protocols & PROT_ICMPv4) |
205 | if (THISNODE->protocols & PROT_ICMPv4) |
152 | { |
206 | { |
153 | icmpv4_fd = socket (PF_INET, SOCK_RAW, IPPROTO_ICMP); |
207 | icmpv4_fd = socket (PF_INET, SOCK_RAW, IPPROTO_ICMP); |
154 | |
208 | |
155 | if (icmpv4_fd < 0) |
209 | if (icmpv4_fd < 0) |
156 | return -1; |
210 | return -1; |
157 | |
211 | |
158 | fcntl (icmpv4_fd, F_SETFL, O_NONBLOCK); |
212 | fcntl (icmpv4_fd, F_SETFL, O_NONBLOCK); |
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213 | fcntl (icmpv4_fd, F_SETFD, FD_CLOEXEC); |
159 | |
214 | |
160 | #ifdef ICMP_FILTER |
215 | #ifdef ICMP_FILTER |
161 | { |
216 | { |
162 | icmp_filter oval; |
217 | icmp_filter oval; |
163 | oval.data = 0xffffffff; |
218 | oval.data = 0xffffffff; |
… | |
… | |
172 | // this I really consider a linux bug. I am neither connected |
227 | // this I really consider a linux bug. I am neither connected |
173 | // nor do I fragment myself. Linux still sets DF and doesn't |
228 | // nor do I fragment myself. Linux still sets DF and doesn't |
174 | // fragment for me sometimes. |
229 | // fragment for me sometimes. |
175 | { |
230 | { |
176 | int oval = IP_PMTUDISC_DONT; |
231 | int oval = IP_PMTUDISC_DONT; |
177 | setsockopt (udpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval); |
232 | setsockopt (icmpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval); |
178 | } |
233 | } |
179 | #endif |
234 | #endif |
180 | |
235 | |
181 | sockinfo si (THISNODE, PROT_ICMPv4); |
236 | sockinfo si (THISNODE, PROT_ICMPv4); |
182 | |
237 | |
183 | if (bind (icmpv4_fd, si.sav4 (), si.salenv4 ())) |
238 | if (bind (icmpv4_fd, si.sav4 (), si.salenv4 ())) |
184 | { |
239 | { |
185 | slog (L_ERR, _("can't bind icmpv4 on %s: %s"), (const char *)si, strerror (errno)); |
240 | slog (L_ERR, _("can't bind icmpv4 on %s: %s"), (const char *)si, strerror (errno)); |
186 | exit (1); |
241 | exit (EXIT_FAILURE); |
187 | } |
242 | } |
188 | |
243 | |
189 | icmpv4_ev_watcher.start (icmpv4_fd, POLLIN); |
244 | icmpv4_ev_watcher.start (icmpv4_fd, EV_READ); |
190 | } |
245 | } |
191 | #endif |
246 | #endif |
192 | |
247 | |
193 | tcpv4_fd = -1; |
248 | tcpv4_fd = -1; |
194 | |
249 | |
… | |
… | |
199 | |
254 | |
200 | if (tcpv4_fd < 0) |
255 | if (tcpv4_fd < 0) |
201 | return -1; |
256 | return -1; |
202 | |
257 | |
203 | fcntl (tcpv4_fd, F_SETFL, O_NONBLOCK); |
258 | fcntl (tcpv4_fd, F_SETFL, O_NONBLOCK); |
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259 | fcntl (tcpv4_fd, F_SETFD, FD_CLOEXEC); |
204 | |
260 | |
205 | // standard daemon practise... |
261 | // standard daemon practise... |
206 | { |
262 | { |
207 | int oval = 1; |
263 | int oval = 1; |
208 | setsockopt (tcpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval); |
264 | setsockopt (tcpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval); |
… | |
… | |
211 | sockinfo si (THISNODE, PROT_TCPv4); |
267 | sockinfo si (THISNODE, PROT_TCPv4); |
212 | |
268 | |
213 | if (bind (tcpv4_fd, si.sav4 (), si.salenv4 ())) |
269 | if (bind (tcpv4_fd, si.sav4 (), si.salenv4 ())) |
214 | { |
270 | { |
215 | slog (L_ERR, _("can't bind tcpv4 on %s: %s"), (const char *)si, strerror (errno)); |
271 | slog (L_ERR, _("can't bind tcpv4 on %s: %s"), (const char *)si, strerror (errno)); |
216 | exit (1); |
272 | exit (EXIT_FAILURE); |
217 | } |
273 | } |
218 | |
274 | |
219 | if (listen (tcpv4_fd, 5)) |
275 | if (listen (tcpv4_fd, 5)) |
220 | { |
276 | { |
221 | slog (L_ERR, _("can't listen tcpv4 on %s: %s"), (const char *)si, strerror (errno)); |
277 | slog (L_ERR, _("can't listen tcpv4 on %s: %s"), (const char *)si, strerror (errno)); |
222 | exit (1); |
278 | exit (EXIT_FAILURE); |
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279 | } |
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280 | |
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281 | tcpv4_ev_watcher.start (tcpv4_fd, EV_READ); |
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282 | } |
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283 | #endif |
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284 | |
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285 | dnsv4_tos = -1; |
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286 | dnsv4_fd = -1; |
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287 | |
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288 | #if ENABLE_DNS |
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289 | if (THISNODE->protocols & PROT_DNSv4) |
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290 | { |
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291 | dns_forwarder.set (::conf.dns_forw_host, ::conf.dns_forw_port, PROT_DNSv4); |
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292 | |
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293 | dnsv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP); |
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294 | |
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295 | if (dnsv4_fd < 0) |
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296 | return -1; |
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297 | |
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298 | fcntl (dnsv4_fd, F_SETFL, O_NONBLOCK); |
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299 | fcntl (dnsv4_fd, F_SETFD, FD_CLOEXEC); |
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300 | |
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301 | # if defined(SOL_IP) && defined(IP_MTU_DISCOVER) |
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302 | // this I really consider a linux bug. I am neither connected |
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303 | // nor do I fragment myself. Linux still sets DF and doesn't |
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304 | // fragment for me sometimes. |
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305 | { |
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306 | int oval = IP_PMTUDISC_DONT; |
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307 | setsockopt (dnsv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval); |
223 | } |
308 | } |
224 | |
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225 | tcpv4_ev_watcher.start (tcpv4_fd, POLLIN); |
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226 | } |
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227 | #endif |
309 | # endif |
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310 | |
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311 | // standard daemon practise... |
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312 | { |
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313 | int oval = 1; |
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314 | setsockopt (dnsv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval); |
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315 | } |
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316 | |
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317 | sockinfo si (THISNODE->dns_hostname, |
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318 | THISNODE->dns_hostname ? THISNODE->dns_port : 0, |
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319 | PROT_DNSv4); |
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320 | |
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321 | if (bind (dnsv4_fd, si.sav4 (), si.salenv4 ())) |
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322 | { |
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323 | slog (L_ERR, _("can't bind dnsv4 on %s: %s"), (const char *)si, strerror (errno)); |
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324 | exit (EXIT_FAILURE); |
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325 | } |
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326 | |
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327 | dnsv4_ev_watcher.start (dnsv4_fd, EV_READ); |
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328 | } |
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329 | #endif |
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330 | |
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331 | ///////////////////////////////////////////////////////////////////////////// |
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332 | |
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333 | reconnect_all (); |
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334 | |
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335 | ///////////////////////////////////////////////////////////////////////////// |
228 | |
336 | |
229 | tap = new tap_device (); |
337 | tap = new tap_device (); |
230 | if (!tap) //D this, of course, never catches |
338 | if (!tap) //D this, of course, never catches |
231 | { |
339 | { |
232 | slog (L_ERR, _("cannot create network interface '%s'"), conf.ifname); |
340 | slog (L_ERR, _("cannot create network interface '%s'"), conf.ifname); |
233 | exit (1); |
341 | exit (EXIT_FAILURE); |
234 | } |
342 | } |
235 | |
343 | |
236 | run_script (run_script_cb (this, &vpn::script_if_up), true); |
344 | fcntl (tap->fd, F_SETFD, FD_CLOEXEC); |
237 | |
345 | |
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346 | run_script_cb cb; |
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347 | cb.set<vpn, &vpn::script_if_init> (this); |
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348 | |
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349 | if (tap->if_up () && |
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350 | !run_script (cb, true)) |
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351 | { |
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352 | slog (L_ERR, _("interface initialization command '%s' failed, exiting."), |
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353 | tap->if_up ()); |
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354 | exit (EXIT_FAILURE); |
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355 | } |
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356 | |
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357 | cb.set<vpn, &vpn::script_if_up> (this); |
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358 | if (!run_script (cb, true)) |
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359 | { |
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360 | slog (L_ERR, _("if-up command execution failed, exiting.")); |
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361 | exit (EXIT_FAILURE); |
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362 | } |
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363 | |
238 | tap_ev_watcher.start (tap->fd, POLLIN); |
364 | tap_ev_watcher.start (tap->fd, EV_READ); |
239 | |
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240 | reconnect_all (); |
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241 | |
365 | |
242 | return 0; |
366 | 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) |
|
|
248 | { |
|
|
249 | switch (si.prot) |
|
|
250 | { |
|
|
251 | case PROT_IPv4: |
|
|
252 | return send_ipv4_packet (pkt, si, tos); |
|
|
253 | |
|
|
254 | case PROT_UDPv4: |
|
|
255 | return send_udpv4_packet (pkt, si, tos); |
|
|
256 | |
|
|
257 | #if ENABLE_TCP |
|
|
258 | case PROT_TCPv4: |
|
|
259 | return send_tcpv4_packet (pkt, si, tos); |
|
|
260 | #endif |
|
|
261 | |
|
|
262 | #if ENABLE_ICMP |
|
|
263 | case PROT_ICMPv4: |
|
|
264 | return send_icmpv4_packet (pkt, si, tos); |
|
|
265 | #endif |
|
|
266 | |
|
|
267 | default: |
|
|
268 | slog (L_CRIT, _("%s: FATAL: trying to send packet with unsupported protocol"), (const char *)si); |
|
|
269 | return false; |
|
|
270 | } |
|
|
271 | } |
367 | } |
272 | |
368 | |
273 | bool |
369 | bool |
274 | vpn::send_ipv4_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
370 | vpn::send_ipv4_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
275 | { |
371 | { |
276 | #if defined(SOL_IP) && defined(IP_TOS) |
372 | set_tos (ipv4_fd, ipv4_tos, tos); |
277 | setsockopt (ipv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos); |
|
|
278 | #endif |
|
|
279 | sendto (ipv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ()); |
373 | sendto (ipv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ()); |
280 | |
374 | |
281 | return true; |
375 | return true; |
282 | } |
376 | } |
283 | |
377 | |
… | |
… | |
306 | |
400 | |
307 | #if ENABLE_ICMP |
401 | #if ENABLE_ICMP |
308 | bool |
402 | bool |
309 | vpn::send_icmpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
403 | vpn::send_icmpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
310 | { |
404 | { |
311 | #if defined(SOL_IP) && defined(IP_TOS) |
|
|
312 | setsockopt (icmpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos); |
|
|
313 | #endif |
|
|
314 | |
|
|
315 | pkt->unshift_hdr (4); |
405 | pkt->unshift_hdr (4); |
316 | |
406 | |
317 | icmp_header *hdr = (icmp_header *)&((*pkt)[0]); |
407 | icmp_header *hdr = (icmp_header *)&((*pkt)[0]); |
318 | hdr->type = ::conf.icmp_type; |
408 | hdr->type = ::conf.icmp_type; |
319 | hdr->code = 255; |
409 | hdr->code = 255; |
320 | hdr->checksum = 0; |
410 | hdr->checksum = 0; |
321 | hdr->checksum = ipv4_checksum ((u16 *)hdr, pkt->len); |
411 | hdr->checksum = ipv4_checksum ((u16 *)hdr, pkt->len); |
322 | |
412 | |
|
|
413 | set_tos (icmpv4_fd, icmpv4_tos, tos); |
323 | sendto (icmpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ()); |
414 | sendto (icmpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ()); |
324 | |
415 | |
325 | return true; |
416 | return true; |
326 | } |
417 | } |
327 | #endif |
418 | #endif |
328 | |
419 | |
329 | bool |
420 | bool |
330 | vpn::send_udpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
421 | vpn::send_udpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
331 | { |
422 | { |
332 | #if defined(SOL_IP) && defined(IP_TOS) |
423 | set_tos (udpv4_fd, udpv4_tos, tos); |
333 | setsockopt (udpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos); |
|
|
334 | #endif |
|
|
335 | sendto (udpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ()); |
424 | sendto (udpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ()); |
336 | |
425 | |
337 | return true; |
426 | return true; |
|
|
427 | } |
|
|
428 | |
|
|
429 | void |
|
|
430 | vpn::inject_data_packet (tap_packet *pkt, int dst) |
|
|
431 | { |
|
|
432 | if (dst) |
|
|
433 | { |
|
|
434 | // unicast |
|
|
435 | if (dst != THISNODE->id) |
|
|
436 | conns[dst - 1]->inject_data_packet (pkt); |
|
|
437 | } |
|
|
438 | else |
|
|
439 | { |
|
|
440 | // broadcast, this is ugly, but due to the security policy |
|
|
441 | // we have to connect to all hosts... |
|
|
442 | for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c) |
|
|
443 | if ((*c)->conf != THISNODE) |
|
|
444 | (*c)->inject_data_packet (pkt); |
|
|
445 | } |
338 | } |
446 | } |
339 | |
447 | |
340 | void |
448 | void |
341 | vpn::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi) |
449 | vpn::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi) |
342 | { |
450 | { |
… | |
… | |
359 | connection *c = conns[src - 1]; |
467 | connection *c = conns[src - 1]; |
360 | |
468 | |
361 | if (dst == 0) |
469 | if (dst == 0) |
362 | slog (L_WARN, _("%s(%s): received broadcast (protocol violation)"), |
470 | slog (L_WARN, _("%s(%s): received broadcast (protocol violation)"), |
363 | c->conf->nodename, (const char *)rsi); |
471 | c->conf->nodename, (const char *)rsi); |
364 | else if (dst != 0 && dst != THISNODE->id) |
472 | else if (dst != THISNODE->id) |
365 | { |
473 | { |
366 | if (THISNODE->routerprio) |
474 | if (THISNODE->routerprio) |
367 | // the tos setting gets lost here. who cares. |
475 | // the tos setting gets lost here. who cares. |
368 | conns[dst - 1]->inject_vpn_packet (pkt); |
476 | conns[dst - 1]->inject_vpn_packet (pkt); |
369 | else |
477 | else |
… | |
… | |
375 | else |
483 | else |
376 | c->recv_vpn_packet (pkt, rsi); |
484 | c->recv_vpn_packet (pkt, rsi); |
377 | } |
485 | } |
378 | } |
486 | } |
379 | |
487 | |
380 | void |
488 | bool |
|
|
489 | vpn::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
|
|
490 | { |
|
|
491 | switch (si.prot) |
|
|
492 | { |
|
|
493 | case PROT_IPv4: |
|
|
494 | return send_ipv4_packet (pkt, si, tos); |
|
|
495 | |
|
|
496 | case PROT_UDPv4: |
|
|
497 | return send_udpv4_packet (pkt, si, tos); |
|
|
498 | |
|
|
499 | #if ENABLE_TCP |
|
|
500 | case PROT_TCPv4: |
|
|
501 | return send_tcpv4_packet (pkt, si, tos); |
|
|
502 | #endif |
|
|
503 | #if ENABLE_ICMP |
|
|
504 | case PROT_ICMPv4: |
|
|
505 | return send_icmpv4_packet (pkt, si, tos); |
|
|
506 | #endif |
|
|
507 | #if ENABLE_DNS |
|
|
508 | case PROT_DNSv4: |
|
|
509 | return send_dnsv4_packet (pkt, si, tos); |
|
|
510 | #endif |
|
|
511 | default: |
|
|
512 | slog (L_CRIT, _("%s: FATAL: trying to send packet with unsupported protocol"), (const char *)si); |
|
|
513 | } |
|
|
514 | |
|
|
515 | return false; |
|
|
516 | } |
|
|
517 | |
|
|
518 | inline void |
381 | vpn::ipv4_ev (io_watcher &w, short revents) |
519 | vpn::ipv4_ev (ev::io &w, int revents) |
382 | { |
520 | { |
383 | if (revents & (POLLIN | POLLERR)) |
521 | if (revents & EV_READ) |
384 | { |
522 | { |
385 | vpn_packet *pkt = new vpn_packet; |
523 | vpn_packet *pkt = new vpn_packet; |
386 | struct sockaddr_in sa; |
524 | struct sockaddr_in sa; |
387 | socklen_t sa_len = sizeof (sa); |
525 | socklen_t sa_len = sizeof (sa); |
388 | int len; |
526 | int len; |
… | |
… | |
393 | |
531 | |
394 | if (len > 0) |
532 | if (len > 0) |
395 | { |
533 | { |
396 | pkt->len = len; |
534 | pkt->len = len; |
397 | |
535 | |
398 | // raw sockets deliver the ipv4, but don't expect it on sends |
536 | // raw sockets deliver the ipv4 header, but don't expect it on sends |
399 | // this is slow, but... |
|
|
400 | pkt->skip_hdr (IP_OVERHEAD); |
537 | pkt->skip_hdr (IP_OVERHEAD); |
401 | |
538 | |
402 | recv_vpn_packet (pkt, si); |
539 | recv_vpn_packet (pkt, si); |
403 | } |
540 | } |
404 | else |
541 | else |
… | |
… | |
407 | slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno)); |
544 | slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno)); |
408 | } |
545 | } |
409 | |
546 | |
410 | delete pkt; |
547 | delete pkt; |
411 | } |
548 | } |
412 | else if (revents & POLLHUP) |
|
|
413 | { |
|
|
414 | // this cannot ;) happen on udp sockets |
|
|
415 | slog (L_ERR, _("FATAL: POLLHUP on ipv4 fd, terminating.")); |
|
|
416 | exit (1); |
|
|
417 | } |
|
|
418 | else |
549 | else |
419 | { |
550 | { |
420 | slog (L_ERR, |
551 | slog (L_ERR, |
421 | _("FATAL: unknown revents %08x in socket, terminating\n"), |
552 | _("FATAL: unknown revents %08x in socket, terminating\n"), |
422 | revents); |
553 | revents); |
423 | exit (1); |
554 | exit (EXIT_FAILURE); |
424 | } |
555 | } |
425 | } |
556 | } |
426 | |
557 | |
427 | #if ENABLE_ICMP |
558 | #if ENABLE_ICMP |
428 | void |
559 | inline void |
429 | vpn::icmpv4_ev (io_watcher &w, short revents) |
560 | vpn::icmpv4_ev (ev::io &w, int revents) |
430 | { |
561 | { |
431 | if (revents & (POLLIN | POLLERR)) |
562 | if (revents & EV_READ) |
432 | { |
563 | { |
433 | vpn_packet *pkt = new vpn_packet; |
564 | vpn_packet *pkt = new vpn_packet; |
434 | struct sockaddr_in sa; |
565 | struct sockaddr_in sa; |
435 | socklen_t sa_len = sizeof (sa); |
566 | socklen_t sa_len = sizeof (sa); |
436 | int len; |
567 | int len; |
… | |
… | |
461 | slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno)); |
592 | slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno)); |
462 | } |
593 | } |
463 | |
594 | |
464 | delete pkt; |
595 | delete pkt; |
465 | } |
596 | } |
466 | else if (revents & POLLHUP) |
|
|
467 | { |
|
|
468 | // this cannot ;) happen on udp sockets |
|
|
469 | slog (L_ERR, _("FATAL: POLLHUP on icmpv4 fd, terminating.")); |
|
|
470 | exit (1); |
|
|
471 | } |
|
|
472 | else |
597 | else |
473 | { |
598 | { |
474 | slog (L_ERR, |
599 | slog (L_ERR, |
475 | _("FATAL: unknown revents %08x in socket, terminating\n"), |
600 | _("FATAL: unknown revents %08x in socket, terminating\n"), |
476 | revents); |
601 | revents); |
477 | exit (1); |
602 | exit (EXIT_FAILURE); |
478 | } |
603 | } |
479 | } |
604 | } |
480 | #endif |
605 | #endif |
481 | |
606 | |
482 | void |
607 | inline void |
483 | vpn::udpv4_ev (io_watcher &w, short revents) |
608 | vpn::udpv4_ev (ev::io &w, int revents) |
484 | { |
609 | { |
485 | if (revents & (POLLIN | POLLERR)) |
610 | if (revents & EV_READ) |
486 | { |
611 | { |
487 | vpn_packet *pkt = new vpn_packet; |
612 | vpn_packet *pkt = new vpn_packet; |
488 | struct sockaddr_in sa; |
613 | struct sockaddr_in sa; |
489 | socklen_t sa_len = sizeof (sa); |
614 | socklen_t sa_len = sizeof (sa); |
490 | int len; |
615 | int len; |
… | |
… | |
505 | slog (L_DEBUG, _("%s: fd %d, %s"), (const char *)si, w.fd, strerror (errno)); |
630 | slog (L_DEBUG, _("%s: fd %d, %s"), (const char *)si, w.fd, strerror (errno)); |
506 | } |
631 | } |
507 | |
632 | |
508 | delete pkt; |
633 | delete pkt; |
509 | } |
634 | } |
510 | else if (revents & POLLHUP) |
|
|
511 | { |
|
|
512 | // this cannot ;) happen on udp sockets |
|
|
513 | slog (L_ERR, _("FATAL: POLLHUP on udp v4 fd, terminating.")); |
|
|
514 | exit (1); |
|
|
515 | } |
|
|
516 | else |
635 | else |
517 | { |
636 | { |
518 | slog (L_ERR, |
637 | slog (L_ERR, |
519 | _("FATAL: unknown revents %08x in socket, terminating\n"), |
638 | _("FATAL: unknown revents %08x in socket, terminating\n"), |
520 | revents); |
639 | revents); |
521 | exit (1); |
640 | exit (EXIT_FAILURE); |
522 | } |
641 | } |
523 | } |
642 | } |
524 | |
643 | |
525 | void |
644 | inline void |
526 | vpn::tap_ev (io_watcher &w, short revents) |
645 | vpn::tap_ev (ev::io &w, int revents) |
527 | { |
646 | { |
528 | if (revents & POLLIN) |
647 | if (revents & EV_READ) |
529 | { |
648 | { |
530 | /* process data */ |
649 | /* process data */ |
531 | tap_packet *pkt; |
650 | tap_packet *pkt; |
532 | |
651 | |
533 | pkt = tap->recv (); |
652 | pkt = tap->recv (); |
534 | |
653 | |
|
|
654 | if (!pkt) |
|
|
655 | return; |
|
|
656 | |
|
|
657 | if (pkt->len > 14) |
|
|
658 | { |
535 | int dst = mac2id (pkt->dst); |
659 | int dst = mac2id (pkt->dst); |
536 | int src = mac2id (pkt->src); |
660 | int src = mac2id (pkt->src); |
537 | |
661 | |
538 | if (src != THISNODE->id) |
662 | if (src != THISNODE->id) |
539 | { |
|
|
540 | slog (L_ERR, _("FATAL: tap packet not originating on current node received, exiting.")); |
|
|
541 | exit (1); |
|
|
542 | } |
|
|
543 | |
|
|
544 | if (dst == THISNODE->id) |
|
|
545 | { |
|
|
546 | slog (L_ERR, _("FATAL: tap packet destined for current node received, exiting.")); |
|
|
547 | exit (1); |
|
|
548 | } |
|
|
549 | |
|
|
550 | if (dst > conns.size ()) |
|
|
551 | slog (L_ERR, _("tap packet for unknown node %d received, ignoring."), dst); |
|
|
552 | else |
|
|
553 | { |
|
|
554 | if (dst) |
|
|
555 | { |
663 | { |
556 | // unicast |
664 | slog (L_ERR, _("FATAL: tap packet not originating on current node received (if-up script not working properly?), exiting.")); |
557 | if (dst != THISNODE->id) |
665 | exit (EXIT_FAILURE); |
558 | conns[dst - 1]->inject_data_packet (pkt); |
|
|
559 | } |
666 | } |
|
|
667 | |
|
|
668 | if (dst == THISNODE->id) |
|
|
669 | { |
|
|
670 | slog (L_ERR, _("FATAL: tap packet destined for current node received, exiting.")); |
|
|
671 | exit (EXIT_FAILURE); |
|
|
672 | } |
|
|
673 | |
|
|
674 | if (dst > conns.size ()) |
|
|
675 | slog (L_ERR, _("tap packet for unknown node %d received, ignoring."), dst); |
560 | else |
676 | else |
561 | { |
|
|
562 | // broadcast, this is ugly, but due to the security policy |
|
|
563 | // we have to connect to all hosts... |
|
|
564 | for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c) |
|
|
565 | if ((*c)->conf != THISNODE) |
|
|
566 | (*c)->inject_data_packet (pkt); |
677 | inject_data_packet (pkt, dst); |
567 | } |
|
|
568 | } |
678 | } |
569 | |
679 | |
570 | delete pkt; |
680 | delete pkt; |
571 | } |
|
|
572 | else if (revents & (POLLHUP | POLLERR)) |
|
|
573 | { |
|
|
574 | slog (L_ERR, _("FATAL: POLLHUP or POLLERR on network device fd, terminating.")); |
|
|
575 | exit (1); |
|
|
576 | } |
681 | } |
577 | else |
682 | else |
578 | abort (); |
683 | abort (); |
579 | } |
684 | } |
580 | |
685 | |
581 | void |
686 | inline void |
582 | vpn::event_cb (time_watcher &w) |
687 | vpn::event_cb (ev::timer &w, int) |
583 | { |
688 | { |
584 | if (events) |
689 | if (events) |
585 | { |
690 | { |
586 | if (events & EVENT_SHUTDOWN) |
691 | if (events & EVENT_SHUTDOWN) |
587 | { |
692 | { |
588 | slog (L_INFO, _("preparing shutdown...")); |
693 | slog (L_INFO, _("preparing shutdown...")); |
589 | |
694 | |
590 | shutdown_all (); |
695 | shutdown_all (); |
591 | |
|
|
592 | remove_pid (pidfilename); |
696 | remove_pid (conf.pidfilename); |
593 | |
|
|
594 | slog (L_INFO, _("terminating")); |
697 | slog (L_INFO, _("terminating")); |
595 | |
698 | exit (EXIT_SUCCESS); |
596 | exit (0); |
|
|
597 | } |
699 | } |
598 | |
700 | |
599 | if (events & EVENT_RECONNECT) |
701 | if (events & EVENT_RECONNECT) |
600 | { |
702 | { |
601 | slog (L_INFO, _("forced reconnect")); |
703 | slog (L_INFO, _("forced reconnect")); |
… | |
… | |
603 | reconnect_all (); |
705 | reconnect_all (); |
604 | } |
706 | } |
605 | |
707 | |
606 | events = 0; |
708 | events = 0; |
607 | } |
709 | } |
608 | |
|
|
609 | w.at = TSTAMP_CANCEL; |
|
|
610 | } |
710 | } |
611 | |
711 | |
612 | void |
712 | void |
613 | vpn::shutdown_all () |
713 | vpn::shutdown_all () |
614 | { |
714 | { |
… | |
… | |
627 | connection_init (); |
727 | connection_init (); |
628 | |
728 | |
629 | for (configuration::node_vector::iterator i = conf.nodes.begin (); |
729 | for (configuration::node_vector::iterator i = conf.nodes.begin (); |
630 | i != conf.nodes.end (); ++i) |
730 | i != conf.nodes.end (); ++i) |
631 | { |
731 | { |
632 | connection *conn = new connection (this); |
732 | connection *conn = new connection (this, *i); |
633 | |
|
|
634 | conn->conf = *i; |
|
|
635 | conns.push_back (conn); |
733 | conns.push_back (conn); |
636 | |
|
|
637 | conn->establish_connection (); |
734 | conn->establish_connection (); |
638 | } |
735 | } |
639 | } |
736 | } |
640 | |
737 | |
641 | connection *vpn::find_router () |
738 | connection *vpn::find_router () |
… | |
… | |
686 | } |
783 | } |
687 | |
784 | |
688 | void |
785 | void |
689 | vpn::dump_status () |
786 | vpn::dump_status () |
690 | { |
787 | { |
691 | slog (L_NOTICE, _("BEGIN status dump (%ld)"), (long)NOW); |
788 | slog (L_NOTICE, _("BEGIN status dump (%ld)"), (long)ev_now ()); |
692 | |
789 | |
693 | for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c) |
790 | for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c) |
694 | (*c)->dump_status (); |
791 | (*c)->dump_status (); |
695 | |
792 | |
696 | slog (L_NOTICE, _("END status dump")); |
793 | slog (L_NOTICE, _("END status dump")); |
697 | } |
794 | } |
698 | |
795 | |
699 | vpn::vpn (void) |
796 | vpn::vpn (void) |
|
|
797 | { |
700 | : event (this, &vpn::event_cb) |
798 | event .set<vpn, &vpn::event_cb > (this); |
701 | , udpv4_ev_watcher (this, &vpn::udpv4_ev) |
799 | udpv4_ev_watcher .set<vpn, &vpn::udpv4_ev > (this); |
702 | , ipv4_ev_watcher (this, &vpn::ipv4_ev) |
800 | ipv4_ev_watcher .set<vpn, &vpn::ipv4_ev > (this); |
703 | #if ENABLE_TCP |
801 | #if ENABLE_TCP |
704 | , tcpv4_ev_watcher (this, &vpn::tcpv4_ev) |
802 | tcpv4_ev_watcher .set<vpn, &vpn::tcpv4_ev > (this); |
705 | #endif |
803 | #endif |
706 | #if ENABLE_ICMP |
804 | #if ENABLE_ICMP |
707 | , icmpv4_ev_watcher(this, &vpn::icmpv4_ev) |
805 | icmpv4_ev_watcher.set<vpn, &vpn::icmpv4_ev> (this); |
708 | #endif |
806 | #endif |
709 | , tap_ev_watcher (this, &vpn::tap_ev) |
807 | #if ENABLE_DNS |
710 | { |
808 | dnsv4_ev_watcher .set<vpn, &vpn::dnsv4_ev > (this); |
|
|
809 | #endif |
|
|
810 | tap_ev_watcher .set<vpn, &vpn::tap_ev > (this); |
711 | } |
811 | } |
712 | |
812 | |
713 | vpn::~vpn () |
813 | vpn::~vpn () |
714 | { |
814 | { |
715 | } |
815 | } |