1 | /* |
1 | /* |
2 | vpn.C -- handle the protocol, encryption, handshaking etc. |
2 | vpn.C -- handle the protocol, encryption, handshaking etc. |
3 | Copyright (C) 2003-2007 Marc Lehmann <gvpe@schmorp.de> |
3 | Copyright (C) 2003-2008,2010,2011,2013 Marc Lehmann <gvpe@schmorp.de> |
4 | |
4 | |
5 | This file is part of GVPE. |
5 | This file is part of GVPE. |
6 | |
6 | |
7 | GVPE is free software; you can redistribute it and/or modify |
7 | GVPE is free software; you can redistribute it and/or modify it |
8 | 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 |
9 | the Free Software Foundation; either version 2 of the License, or |
9 | Free Software Foundation; either version 3 of the License, or (at your |
10 | (at your option) any later version. |
10 | option) any later version. |
11 | |
11 | |
12 | 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 |
13 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
13 | WITHOUT ANY WARRANTY; without even the implied warranty of |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General |
15 | GNU General Public License for more details. |
15 | Public License for more details. |
16 | |
16 | |
17 | 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 |
18 | along with gvpe; if not, write to the Free Software |
18 | with this program; if not, see <http://www.gnu.org/licenses/>. |
19 | Foundation, Inc. 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 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. |
20 | */ |
30 | */ |
21 | |
31 | |
22 | #include "config.h" |
32 | #include "config.h" |
23 | |
33 | |
24 | #include <list> |
34 | #include <list> |
… | |
… | |
28 | #include <cstdlib> |
38 | #include <cstdlib> |
29 | |
39 | |
30 | #include <sys/types.h> |
40 | #include <sys/types.h> |
31 | #include <sys/socket.h> |
41 | #include <sys/socket.h> |
32 | #include <sys/wait.h> |
42 | #include <sys/wait.h> |
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43 | #include <sys/stat.h> |
33 | #include <errno.h> |
44 | #include <errno.h> |
34 | #include <time.h> |
45 | #include <time.h> |
35 | #include <unistd.h> |
46 | #include <unistd.h> |
36 | #include <fcntl.h> |
47 | #include <fcntl.h> |
37 | #include <sys/socket.h> |
48 | #include <sys/socket.h> |
… | |
… | |
42 | |
53 | |
43 | #include "connection.h" |
54 | #include "connection.h" |
44 | #include "util.h" |
55 | #include "util.h" |
45 | #include "vpn.h" |
56 | #include "vpn.h" |
46 | |
57 | |
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58 | using namespace std; |
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59 | |
47 | vpn network; // THE vpn (bad design...) |
60 | vpn network; // THE vpn (bad design...) |
48 | |
61 | |
49 | ///////////////////////////////////////////////////////////////////////////// |
62 | ///////////////////////////////////////////////////////////////////////////// |
50 | |
63 | |
51 | static void inline |
64 | static void inline |
… | |
… | |
65 | { |
78 | { |
66 | // the tunnel device mtu should be the physical mtu - overhead |
79 | // the tunnel device mtu should be the physical mtu - overhead |
67 | // the tricky part is rounding to the cipher key blocksize |
80 | // the tricky part is rounding to the cipher key blocksize |
68 | int mtu = conf.mtu - ETH_OVERHEAD - VPE_OVERHEAD - MAX_OVERHEAD; |
81 | int mtu = conf.mtu - ETH_OVERHEAD - VPE_OVERHEAD - MAX_OVERHEAD; |
69 | mtu += ETH_OVERHEAD - 6 - 6; // now we have the data portion |
82 | mtu += ETH_OVERHEAD - 6 - 6; // now we have the data portion |
70 | mtu -= mtu % EVP_CIPHER_block_size (CIPHER); // round |
83 | mtu -= mtu % BLOCK_SIZE (CIPHER); // round |
71 | mtu -= ETH_OVERHEAD - 6 - 6; // and get interface mtu again |
84 | mtu -= ETH_OVERHEAD - 6 - 6; // and get interface mtu again |
72 | |
85 | |
73 | char *env; |
86 | char *env; |
74 | asprintf (&env, "CONFBASE=%s", confbase); putenv (env); |
87 | asprintf (&env, "CONFBASE=%s", confbase); putenv (env); |
75 | asprintf (&env, "IFNAME=%s", tap->interface ()); putenv (env); |
88 | asprintf (&env, "IFNAME=%s", tap->interface ()); putenv (env); |
… | |
… | |
100 | inline const char * |
113 | inline const char * |
101 | vpn::script_if_up () |
114 | vpn::script_if_up () |
102 | { |
115 | { |
103 | script_init_env (); |
116 | script_init_env (); |
104 | |
117 | |
105 | char *filename; |
118 | return conf.config_filename (::conf.script_if_up, "if-up"); |
106 | asprintf (&filename, |
119 | } |
107 | "%s/%s", |
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108 | confbase, |
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109 | ::conf.script_if_up ? ::conf.script_if_up : "if-up"); |
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110 | |
120 | |
111 | return filename; |
121 | int |
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122 | vpn::setup_socket (u8 prot, int family, int type, int proto) |
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123 | { |
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124 | int fd = socket (family, type, proto); |
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125 | |
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126 | if (fd < 0) |
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127 | { |
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128 | slog (L_ERR, _("unable to create %s socket: %s."), strprotocol (prot), strerror (errno)); |
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129 | return fd; |
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130 | } |
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131 | |
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132 | fcntl (fd, F_SETFL, O_NONBLOCK); |
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133 | fcntl (fd, F_SETFD, FD_CLOEXEC); |
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134 | |
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135 | #ifdef SO_MARK |
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136 | if (::conf.nfmark) |
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137 | if (setsockopt (fd, SOL_SOCKET, SO_MARK, &::conf.nfmark, sizeof ::conf.nfmark)) |
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138 | slog (L_WARN, _("unable to set nfmark on %s socket: %s"), strprotocol (prot), strerror (errno)); |
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139 | #endif |
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140 | |
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141 | return fd; |
112 | } |
142 | } |
113 | |
143 | |
114 | int |
144 | int |
115 | vpn::setup () |
145 | vpn::setup () |
116 | { |
146 | { |
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147 | int success = 0; |
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148 | |
117 | ipv4_tos = -1; |
149 | ipv4_tos = -1; |
118 | ipv4_fd = -1; |
150 | ipv4_fd = -1; |
119 | |
151 | |
120 | if (THISNODE->protocols & PROT_IPv4 && ::conf.ip_proto) |
152 | if (THISNODE->protocols & PROT_IPv4 && ::conf.ip_proto) |
121 | { |
153 | { |
122 | ipv4_fd = socket (PF_INET, SOCK_RAW, ::conf.ip_proto); |
154 | ipv4_fd = setup_socket (PROT_IPv4, PF_INET, SOCK_RAW, ::conf.ip_proto); |
123 | |
155 | |
124 | if (ipv4_fd < 0) |
156 | if (ipv4_fd < 0) |
125 | return -1; |
157 | return -1; |
126 | |
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127 | fcntl (ipv4_fd, F_SETFL, O_NONBLOCK); |
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128 | fcntl (ipv4_fd, F_SETFD, FD_CLOEXEC); |
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129 | |
158 | |
130 | #if defined(SOL_IP) && defined(IP_MTU_DISCOVER) |
159 | #if defined(SOL_IP) && defined(IP_MTU_DISCOVER) |
131 | // this I really consider a linux bug. I am neither connected |
160 | // this I really consider a linux bug. I am neither connected |
132 | // nor do I fragment myself. Linux still sets DF and doesn't |
161 | // nor do I fragment myself. Linux still sets DF and doesn't |
133 | // fragment for me sometimes. |
162 | // fragment for me sometimes. |
… | |
… | |
139 | |
168 | |
140 | sockinfo si (THISNODE, PROT_IPv4); |
169 | sockinfo si (THISNODE, PROT_IPv4); |
141 | |
170 | |
142 | if (bind (ipv4_fd, si.sav4 (), si.salenv4 ())) |
171 | if (bind (ipv4_fd, si.sav4 (), si.salenv4 ())) |
143 | { |
172 | { |
144 | slog (L_ERR, _("can't bind ipv4 socket on %s: %s"), (const char *)si, strerror (errno)); |
173 | slog (L_ERR, _("can't bind ipv4 socket on %s: %s, exiting."), (const char *)si, strerror (errno)); |
145 | exit (EXIT_FAILURE); |
174 | return -1; |
146 | } |
175 | } |
147 | |
176 | |
148 | ipv4_ev_watcher.start (ipv4_fd, EV_READ); |
177 | ipv4_ev_watcher.start (ipv4_fd, EV_READ); |
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178 | ++success; |
149 | } |
179 | } |
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180 | else |
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181 | THISNODE->protocols &= ~PROT_IPv4; |
150 | |
182 | |
151 | udpv4_tos = -1; |
183 | udpv4_tos = -1; |
152 | udpv4_fd = -1; |
184 | udpv4_fd = -1; |
153 | |
185 | |
154 | if (THISNODE->protocols & PROT_UDPv4 && THISNODE->udp_port) |
186 | if (THISNODE->protocols & PROT_UDPv4 && THISNODE->udp_port) |
155 | { |
187 | { |
156 | udpv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP); |
188 | udpv4_fd = setup_socket (PROT_UDPv4, PF_INET, SOCK_DGRAM, IPPROTO_UDP); |
157 | |
189 | |
158 | if (udpv4_fd < 0) |
190 | if (udpv4_fd < 0) |
159 | return -1; |
191 | return -1; |
160 | |
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161 | fcntl (udpv4_fd, F_SETFL, O_NONBLOCK); |
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162 | fcntl (udpv4_fd, F_SETFD, FD_CLOEXEC); |
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163 | |
192 | |
164 | // standard daemon practise... |
193 | // standard daemon practise... |
165 | { |
194 | { |
166 | int oval = 1; |
195 | int oval = 1; |
167 | setsockopt (udpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval); |
196 | setsockopt (udpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval); |
… | |
… | |
179 | |
208 | |
180 | sockinfo si (THISNODE, PROT_UDPv4); |
209 | sockinfo si (THISNODE, PROT_UDPv4); |
181 | |
210 | |
182 | if (bind (udpv4_fd, si.sav4 (), si.salenv4 ())) |
211 | if (bind (udpv4_fd, si.sav4 (), si.salenv4 ())) |
183 | { |
212 | { |
184 | slog (L_ERR, _("can't bind udpv4 on %s: %s"), (const char *)si, strerror (errno)); |
213 | slog (L_ERR, _("can't bind udpv4 on %s: %s, exiting."), (const char *)si, strerror (errno)); |
185 | exit (EXIT_FAILURE); |
214 | return -1; |
186 | } |
215 | } |
187 | |
216 | |
188 | udpv4_ev_watcher.start (udpv4_fd, EV_READ); |
217 | udpv4_ev_watcher.start (udpv4_fd, EV_READ); |
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218 | ++success; |
189 | } |
219 | } |
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220 | else |
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221 | THISNODE->protocols &= ~PROT_UDPv4; |
190 | |
222 | |
191 | icmpv4_tos = -1; |
223 | icmpv4_tos = -1; |
192 | icmpv4_fd = -1; |
224 | icmpv4_fd = -1; |
193 | |
225 | |
194 | #if ENABLE_ICMP |
226 | #if ENABLE_ICMP |
195 | if (THISNODE->protocols & PROT_ICMPv4) |
227 | if (THISNODE->protocols & PROT_ICMPv4) |
196 | { |
228 | { |
197 | icmpv4_fd = socket (PF_INET, SOCK_RAW, IPPROTO_ICMP); |
229 | icmpv4_fd = setup_socket (PROT_ICMPv4, PF_INET, SOCK_RAW, IPPROTO_ICMP); |
198 | |
230 | |
199 | if (icmpv4_fd < 0) |
231 | if (icmpv4_fd < 0) |
200 | return -1; |
232 | return -1; |
201 | |
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202 | fcntl (icmpv4_fd, F_SETFL, O_NONBLOCK); |
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203 | fcntl (icmpv4_fd, F_SETFD, FD_CLOEXEC); |
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204 | |
233 | |
205 | #ifdef ICMP_FILTER |
234 | #ifdef ICMP_FILTER |
206 | { |
235 | { |
207 | icmp_filter oval; |
236 | icmp_filter oval; |
208 | oval.data = 0xffffffff; |
237 | oval.data = 0xffffffff; |
… | |
… | |
225 | |
254 | |
226 | sockinfo si (THISNODE, PROT_ICMPv4); |
255 | sockinfo si (THISNODE, PROT_ICMPv4); |
227 | |
256 | |
228 | if (bind (icmpv4_fd, si.sav4 (), si.salenv4 ())) |
257 | if (bind (icmpv4_fd, si.sav4 (), si.salenv4 ())) |
229 | { |
258 | { |
230 | slog (L_ERR, _("can't bind icmpv4 on %s: %s"), (const char *)si, strerror (errno)); |
259 | slog (L_ERR, _("can't bind icmpv4 on %s: %s, exiting."), (const char *)si, strerror (errno)); |
231 | exit (EXIT_FAILURE); |
260 | return -1; |
232 | } |
261 | } |
233 | |
262 | |
234 | icmpv4_ev_watcher.start (icmpv4_fd, EV_READ); |
263 | icmpv4_ev_watcher.start (icmpv4_fd, EV_READ); |
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264 | ++success; |
235 | } |
265 | } |
236 | #endif |
266 | #endif |
237 | |
267 | |
238 | tcpv4_fd = -1; |
268 | tcpv4_fd = -1; |
239 | |
269 | |
240 | #if ENABLE_TCP |
270 | #if ENABLE_TCP |
241 | if (THISNODE->protocols & PROT_TCPv4 && THISNODE->tcp_port) |
271 | if (THISNODE->protocols & PROT_TCPv4 && THISNODE->tcp_port) |
242 | { |
272 | { |
243 | tcpv4_fd = socket (PF_INET, SOCK_STREAM, IPPROTO_TCP); |
273 | tcpv4_fd = setup_socket (PROT_TCPv4, PF_INET, SOCK_STREAM, IPPROTO_TCP); |
244 | |
274 | |
245 | if (tcpv4_fd < 0) |
275 | if (tcpv4_fd < 0) |
246 | return -1; |
276 | return -1; |
247 | |
277 | |
248 | fcntl (tcpv4_fd, F_SETFL, O_NONBLOCK); |
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249 | fcntl (tcpv4_fd, F_SETFD, FD_CLOEXEC); |
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250 | |
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251 | // standard daemon practise... |
278 | // standard daemon practise... |
252 | { |
279 | { |
253 | int oval = 1; |
280 | int oval = 1; |
254 | setsockopt (tcpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval); |
281 | setsockopt (tcpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval); |
255 | } |
282 | } |
256 | |
283 | |
257 | sockinfo si (THISNODE, PROT_TCPv4); |
284 | sockinfo si (THISNODE, PROT_TCPv4); |
258 | |
285 | |
259 | if (bind (tcpv4_fd, si.sav4 (), si.salenv4 ())) |
286 | if (bind (tcpv4_fd, si.sav4 (), si.salenv4 ())) |
260 | { |
287 | { |
261 | slog (L_ERR, _("can't bind tcpv4 on %s: %s"), (const char *)si, strerror (errno)); |
288 | slog (L_ERR, _("can't bind tcpv4 on %s: %s, exiting."), (const char *)si, strerror (errno)); |
262 | exit (EXIT_FAILURE); |
289 | return -1; |
263 | } |
290 | } |
264 | |
291 | |
265 | if (listen (tcpv4_fd, 5)) |
292 | if (listen (tcpv4_fd, 5)) |
266 | { |
293 | { |
267 | slog (L_ERR, _("can't listen tcpv4 on %s: %s"), (const char *)si, strerror (errno)); |
294 | slog (L_ERR, _("can't listen tcpv4 on %s: %s, exiting."), (const char *)si, strerror (errno)); |
268 | exit (EXIT_FAILURE); |
295 | return -1; |
269 | } |
296 | } |
270 | |
297 | |
271 | tcpv4_ev_watcher.start (tcpv4_fd, EV_READ); |
298 | tcpv4_ev_watcher.start (tcpv4_fd, EV_READ); |
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299 | ++success; |
272 | } |
300 | } |
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301 | else |
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302 | THISNODE->protocols &= ~PROT_TCPv4; |
273 | #endif |
303 | #endif |
274 | |
304 | |
275 | dnsv4_tos = -1; |
305 | dnsv4_tos = -1; |
276 | dnsv4_fd = -1; |
306 | dnsv4_fd = -1; |
277 | |
307 | |
278 | #if ENABLE_DNS |
308 | #if ENABLE_DNS |
279 | if (THISNODE->protocols & PROT_DNSv4) |
309 | if (THISNODE->protocols & PROT_DNSv4) |
280 | { |
310 | { |
281 | dns_forwarder.set (::conf.dns_forw_host, ::conf.dns_forw_port, PROT_DNSv4); |
311 | dns_forwarder.set (::conf.dns_forw_host, ::conf.dns_forw_port, PROT_DNSv4); |
282 | |
312 | |
283 | dnsv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP); |
313 | dnsv4_fd = setup_socket (PROT_DNSv4, PF_INET, SOCK_DGRAM, IPPROTO_UDP); |
284 | |
314 | |
285 | if (dnsv4_fd < 0) |
315 | if (dnsv4_fd < 0) |
286 | return -1; |
316 | return -1; |
287 | |
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288 | fcntl (dnsv4_fd, F_SETFL, O_NONBLOCK); |
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289 | fcntl (dnsv4_fd, F_SETFD, FD_CLOEXEC); |
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290 | |
317 | |
291 | # if defined(SOL_IP) && defined(IP_MTU_DISCOVER) |
318 | # if defined(SOL_IP) && defined(IP_MTU_DISCOVER) |
292 | // this I really consider a linux bug. I am neither connected |
319 | // this I really consider a linux bug. I am neither connected |
293 | // nor do I fragment myself. Linux still sets DF and doesn't |
320 | // nor do I fragment myself. Linux still sets DF and doesn't |
294 | // fragment for me sometimes. |
321 | // fragment for me sometimes. |
… | |
… | |
308 | THISNODE->dns_hostname ? THISNODE->dns_port : 0, |
335 | THISNODE->dns_hostname ? THISNODE->dns_port : 0, |
309 | PROT_DNSv4); |
336 | PROT_DNSv4); |
310 | |
337 | |
311 | if (bind (dnsv4_fd, si.sav4 (), si.salenv4 ())) |
338 | if (bind (dnsv4_fd, si.sav4 (), si.salenv4 ())) |
312 | { |
339 | { |
313 | slog (L_ERR, _("can't bind dnsv4 on %s: %s"), (const char *)si, strerror (errno)); |
340 | slog (L_ERR, _("can't bind dnsv4 on %s: %s, exiting."), (const char *)si, strerror (errno)); |
314 | exit (EXIT_FAILURE); |
341 | return -1; |
315 | } |
342 | } |
316 | |
343 | |
317 | dnsv4_ev_watcher.start (dnsv4_fd, EV_READ); |
344 | dnsv4_ev_watcher.start (dnsv4_fd, EV_READ); |
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345 | ++success; |
318 | } |
346 | } |
319 | #endif |
347 | #endif |
320 | |
348 | |
321 | ///////////////////////////////////////////////////////////////////////////// |
349 | ///////////////////////////////////////////////////////////////////////////// |
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350 | |
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351 | if (!success) |
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352 | { |
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353 | slog (L_ERR, _("no protocols enabled.")); |
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354 | return -1; |
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355 | } |
322 | |
356 | |
323 | reconnect_all (); |
357 | reconnect_all (); |
324 | |
358 | |
325 | ///////////////////////////////////////////////////////////////////////////// |
359 | ///////////////////////////////////////////////////////////////////////////// |
326 | |
360 | |
327 | tap = new tap_device (); |
361 | tap = new tap_device (); |
328 | if (!tap) //D this, of course, never catches |
362 | if (!tap) //D this, of course, never catches |
329 | { |
363 | { |
330 | slog (L_ERR, _("cannot create network interface '%s'"), conf.ifname); |
364 | slog (L_ERR, _("cannot create network interface '%s'."), conf.ifname); |
331 | exit (EXIT_FAILURE); |
365 | return -1; |
332 | } |
366 | } |
333 | |
367 | |
334 | fcntl (tap->fd, F_SETFD, FD_CLOEXEC); |
368 | fcntl (tap->fd, F_SETFD, FD_CLOEXEC); |
335 | |
369 | |
336 | run_script_cb cb; |
370 | run_script_cb cb; |
337 | cb.set<vpn, &vpn::script_if_init> (this); |
371 | cb.set<vpn, &vpn::script_if_init> (this); |
338 | |
372 | |
339 | if (tap->if_up () && |
373 | if (tap->if_up () && |
340 | !run_script (cb, true)) |
374 | !run_script (cb, true)) |
341 | { |
375 | { |
342 | slog (L_ERR, _("interface initialization command '%s' failed, exiting."), |
376 | slog (L_ERR, _("interface initialization command '%s' failed."), |
343 | tap->if_up ()); |
377 | tap->if_up ()); |
344 | exit (EXIT_FAILURE); |
378 | return -1; |
345 | } |
379 | } |
346 | |
380 | |
347 | cb.set<vpn, &vpn::script_if_up> (this); |
381 | cb.set<vpn, &vpn::script_if_up> (this); |
348 | if (!run_script (cb, true)) |
382 | if (!run_script (cb, true)) |
349 | { |
383 | { |
350 | slog (L_ERR, _("if-up command execution failed, exiting.")); |
384 | slog (L_ERR, _("if-up command execution failed.")); |
351 | exit (EXIT_FAILURE); |
385 | return -1; |
352 | } |
386 | } |
353 | |
387 | |
354 | tap_ev_watcher.start (tap->fd, EV_READ); |
388 | tap_ev_watcher.start (tap->fd, EV_READ); |
355 | |
389 | |
356 | return 0; |
390 | return 0; |
|
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391 | } |
|
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392 | |
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393 | bool |
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394 | vpn::drop_privileges () |
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395 | { |
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396 | if (::conf.change_root) |
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397 | { |
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398 | if (!strcmp (::conf.change_root, "/")) |
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399 | { |
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400 | char dir [L_tmpnam]; |
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401 | if (!tmpnam (dir)) |
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402 | { |
|
|
403 | slog (L_CRIT, _("unable to create anonymous root path.")); |
|
|
404 | return false; |
|
|
405 | } |
|
|
406 | |
|
|
407 | if (mkdir (dir, 0700)) |
|
|
408 | { |
|
|
409 | slog (L_CRIT, _("unable to create anonymous root directory.")); |
|
|
410 | return false; |
|
|
411 | } |
|
|
412 | |
|
|
413 | if (chdir (dir)) |
|
|
414 | { |
|
|
415 | slog (L_CRIT, _("unable to change to anonymous root directory.")); |
|
|
416 | return false; |
|
|
417 | } |
|
|
418 | |
|
|
419 | if (rmdir (dir)) |
|
|
420 | slog (L_ERR, _("unable to remove anonymous root directory, continuing.")); |
|
|
421 | } |
|
|
422 | else |
|
|
423 | { |
|
|
424 | if (chdir (::conf.change_root)) |
|
|
425 | { |
|
|
426 | slog (L_CRIT, _("%s: unable to change to specified root directory."), ::conf.change_root); |
|
|
427 | return false; |
|
|
428 | } |
|
|
429 | } |
|
|
430 | |
|
|
431 | if (chroot (".")) |
|
|
432 | { |
|
|
433 | slog (L_CRIT, _("unable to set new root directory.")); |
|
|
434 | return false; |
|
|
435 | } |
|
|
436 | |
|
|
437 | if (chdir ("/")) |
|
|
438 | { |
|
|
439 | slog (L_CRIT, _("unable to set cwd to new root directory.")); |
|
|
440 | return false; |
|
|
441 | } |
|
|
442 | } |
|
|
443 | |
|
|
444 | if (::conf.change_gid) |
|
|
445 | if (setgid (::conf.change_gid)) |
|
|
446 | { |
|
|
447 | slog (L_CRIT, _("unable to change group id to %d."), ::conf.change_gid); |
|
|
448 | return false; |
|
|
449 | } |
|
|
450 | |
|
|
451 | if (::conf.change_uid) |
|
|
452 | if (setuid (::conf.change_uid)) |
|
|
453 | { |
|
|
454 | slog (L_CRIT, _("unable to change user id to %d."), ::conf.change_uid); |
|
|
455 | return false; |
|
|
456 | } |
|
|
457 | |
|
|
458 | return true; |
357 | } |
459 | } |
358 | |
460 | |
359 | bool |
461 | bool |
360 | vpn::send_ipv4_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
462 | vpn::send_ipv4_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
361 | { |
463 | { |
… | |
… | |
439 | vpn::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi) |
541 | vpn::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi) |
440 | { |
542 | { |
441 | unsigned int src = pkt->src (); |
543 | unsigned int src = pkt->src (); |
442 | unsigned int dst = pkt->dst (); |
544 | unsigned int dst = pkt->dst (); |
443 | |
545 | |
444 | slog (L_NOISE, _("<<?/%s received possible vpn packet type %d from %d to %d, length %d"), |
546 | slog (L_NOISE, _("<<?/%s received possible vpn packet type %d from %d to %d, length %d."), |
445 | (const char *)rsi, pkt->typ (), pkt->src (), pkt->dst (), pkt->len); |
547 | (const char *)rsi, pkt->typ (), pkt->src (), pkt->dst (), pkt->len); |
446 | |
548 | |
447 | if (src == 0 || src > conns.size () |
549 | if (src == 0 || src > conns.size () |
448 | || dst > conns.size () |
550 | || dst > conns.size () |
449 | || pkt->typ () >= vpn_packet::PT_MAX) |
551 | || pkt->typ () >= vpn_packet::PT_MAX) |
450 | slog (L_WARN, _("(%s): received corrupted packet type %d (src %d, dst %d)"), |
552 | slog (L_WARN, _("(%s): received corrupted packet type %d (src %d, dst %d)."), |
451 | (const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ()); |
|
|
452 | else if (dst > conns.size ()) |
|
|
453 | slog (L_WARN, _("(%s): received corrupted packet type %d (src %d, dst %d)"), |
|
|
454 | (const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ()); |
553 | (const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ()); |
455 | else |
554 | else |
456 | { |
555 | { |
457 | connection *c = conns[src - 1]; |
556 | connection *c = conns[src - 1]; |
458 | |
557 | |
459 | if (dst == 0) |
558 | if (dst == 0) |
460 | slog (L_WARN, _("%s(%s): received broadcast (protocol violation)"), |
559 | slog (L_WARN, _("%s(%s): received broadcast (protocol violation)."), |
461 | c->conf->nodename, (const char *)rsi); |
560 | c->conf->nodename, (const char *)rsi); |
462 | else if (dst != THISNODE->id) |
561 | else if (dst != THISNODE->id) |
463 | { |
562 | { |
464 | if (THISNODE->routerprio) |
563 | if (THISNODE->routerprio) |
465 | // the tos setting gets lost here. who cares. |
564 | // the tos setting gets lost here. who cares. |
466 | conns[dst - 1]->inject_vpn_packet (pkt); |
565 | conns[dst - 1]->inject_vpn_packet (pkt); |
467 | else |
566 | else |
468 | slog (L_WARN, |
567 | slog (L_WARN, |
469 | _("%s(%s): forwarding request (=> %s), but we are no router"), |
568 | _("%s(%s): request to forward packet to %s, but we are no router (config mismatch?)."), |
470 | c->conf->nodename, (const char *)rsi, |
569 | c->conf->nodename, (const char *)rsi, |
471 | conns[dst - 1]->conf->nodename); |
570 | conns[dst - 1]->conf->nodename); |
472 | } |
571 | } |
473 | else |
572 | else |
474 | c->recv_vpn_packet (pkt, rsi); |
573 | c->recv_vpn_packet (pkt, rsi); |
… | |
… | |
479 | vpn::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
578 | vpn::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
480 | { |
579 | { |
481 | switch (si.prot) |
580 | switch (si.prot) |
482 | { |
581 | { |
483 | case PROT_IPv4: |
582 | case PROT_IPv4: |
484 | return send_ipv4_packet (pkt, si, tos); |
583 | return send_ipv4_packet (pkt, si, tos); |
485 | |
584 | |
486 | case PROT_UDPv4: |
585 | case PROT_UDPv4: |
487 | return send_udpv4_packet (pkt, si, tos); |
586 | return send_udpv4_packet (pkt, si, tos); |
488 | |
587 | |
489 | #if ENABLE_TCP |
588 | #if ENABLE_TCP |
490 | case PROT_TCPv4: |
589 | case PROT_TCPv4: |
491 | return send_tcpv4_packet (pkt, si, tos); |
590 | return send_tcpv4_packet (pkt, si, tos); |
492 | #endif |
591 | #endif |
493 | #if ENABLE_ICMP |
592 | #if ENABLE_ICMP |
494 | case PROT_ICMPv4: |
593 | case PROT_ICMPv4: |
495 | return send_icmpv4_packet (pkt, si, tos); |
594 | return send_icmpv4_packet (pkt, si, tos); |
496 | #endif |
595 | #endif |
497 | #if ENABLE_DNS |
596 | #if ENABLE_DNS |
498 | case PROT_DNSv4: |
597 | case PROT_DNSv4: |
499 | return send_dnsv4_packet (pkt, si, tos); |
598 | return send_dnsv4_packet (pkt, si, tos); |
500 | #endif |
599 | #endif |
501 | default: |
600 | default: |
502 | slog (L_CRIT, _("%s: FATAL: trying to send packet with unsupported protocol"), (const char *)si); |
601 | slog (L_CRIT, _("%s: FATAL: trying to send packet with unsupported protocol."), (const char *)si); |
503 | } |
602 | } |
504 | |
603 | |
505 | return false; |
604 | return false; |
506 | } |
605 | } |
507 | |
606 | |
… | |
… | |
522 | if (len > 0) |
621 | if (len > 0) |
523 | { |
622 | { |
524 | pkt->len = len; |
623 | pkt->len = len; |
525 | |
624 | |
526 | // raw sockets deliver the ipv4 header, but don't expect it on sends |
625 | // raw sockets deliver the ipv4 header, but don't expect it on sends |
527 | pkt->skip_hdr (IP_OVERHEAD); |
626 | pkt->skip_hdr (pkt->ipv4_hdr_len ()); |
528 | |
627 | |
529 | recv_vpn_packet (pkt, si); |
628 | recv_vpn_packet (pkt, si); |
530 | } |
629 | } |
531 | else |
630 | else |
532 | { |
631 | { |
533 | // probably ECONNRESET or somesuch |
632 | // probably ECONNRESET or somesuch |
534 | slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno)); |
633 | slog (L_DEBUG, _("%s: %s."), (const char *)si, strerror (errno)); |
535 | } |
634 | } |
536 | |
635 | |
537 | delete pkt; |
636 | delete pkt; |
538 | } |
637 | } |
539 | else |
638 | else |
540 | { |
639 | { |
541 | slog (L_ERR, |
640 | slog (L_ERR, |
542 | _("FATAL: unknown revents %08x in socket, terminating\n"), |
641 | _("FATAL: unknown revents %08x in socket, exiting.\n"), |
543 | revents); |
642 | revents); |
544 | exit (EXIT_FAILURE); |
643 | exit (EXIT_FAILURE); |
545 | } |
644 | } |
546 | } |
645 | } |
547 | |
646 | |
… | |
… | |
569 | if (hdr->type == ::conf.icmp_type |
668 | if (hdr->type == ::conf.icmp_type |
570 | && hdr->code == 255) |
669 | && hdr->code == 255) |
571 | { |
670 | { |
572 | // raw sockets deliver the ipv4, but don't expect it on sends |
671 | // raw sockets deliver the ipv4, but don't expect it on sends |
573 | // this is slow, but... |
672 | // this is slow, but... |
574 | pkt->skip_hdr (ICMP_OVERHEAD); |
673 | pkt->skip_hdr (pkt->ipv4_hdr_len () + (ICMP_OVERHEAD - IP_OVERHEAD)); |
575 | |
674 | |
576 | recv_vpn_packet (pkt, si); |
675 | recv_vpn_packet (pkt, si); |
577 | } |
676 | } |
578 | } |
677 | } |
579 | else |
678 | else |
580 | { |
679 | { |
581 | // probably ECONNRESET or somesuch |
680 | // probably ECONNRESET or somesuch |
582 | slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno)); |
681 | slog (L_DEBUG, _("%s: %s."), (const char *)si, strerror (errno)); |
583 | } |
682 | } |
584 | |
683 | |
585 | delete pkt; |
684 | delete pkt; |
586 | } |
685 | } |
587 | else |
686 | else |
588 | { |
687 | { |
589 | slog (L_ERR, |
688 | slog (L_ERR, |
590 | _("FATAL: unknown revents %08x in socket, terminating\n"), |
689 | _("FATAL: unknown revents %08x in socket, exiting.\n"), |
591 | revents); |
690 | revents); |
592 | exit (EXIT_FAILURE); |
691 | exit (EXIT_FAILURE); |
593 | } |
692 | } |
594 | } |
693 | } |
595 | #endif |
694 | #endif |
… | |
… | |
615 | recv_vpn_packet (pkt, si); |
714 | recv_vpn_packet (pkt, si); |
616 | } |
715 | } |
617 | else |
716 | else |
618 | { |
717 | { |
619 | // probably ECONNRESET or somesuch |
718 | // probably ECONNRESET or somesuch |
620 | slog (L_DEBUG, _("%s: fd %d, %s"), (const char *)si, w.fd, strerror (errno)); |
719 | slog (L_DEBUG, _("%s: fd %d, %s."), (const char *)si, w.fd, strerror (errno)); |
621 | } |
720 | } |
622 | |
721 | |
623 | delete pkt; |
722 | delete pkt; |
624 | } |
723 | } |
625 | else |
724 | else |
626 | { |
725 | { |
627 | slog (L_ERR, |
726 | slog (L_ERR, |
628 | _("FATAL: unknown revents %08x in socket, terminating\n"), |
727 | _("FATAL: unknown revents %08x in socket, exiting.\n"), |
629 | revents); |
728 | revents); |
630 | exit (EXIT_FAILURE); |
729 | exit (EXIT_FAILURE); |
631 | } |
730 | } |
632 | } |
731 | } |
633 | |
732 | |
… | |
… | |
682 | { |
781 | { |
683 | slog (L_INFO, _("preparing shutdown...")); |
782 | slog (L_INFO, _("preparing shutdown...")); |
684 | |
783 | |
685 | shutdown_all (); |
784 | shutdown_all (); |
686 | remove_pid (conf.pidfilename); |
785 | remove_pid (conf.pidfilename); |
687 | slog (L_INFO, _("terminating")); |
786 | slog (L_INFO, _("exiting.")); |
688 | exit (EXIT_SUCCESS); |
787 | exit (EXIT_SUCCESS); |
689 | } |
788 | } |
690 | |
789 | |
691 | if (events & EVENT_RECONNECT) |
790 | if (events & EVENT_RECONNECT) |
692 | { |
791 | { |
693 | slog (L_INFO, _("forced reconnect")); |
792 | slog (L_INFO, _("forced reconnect.")); |
694 | |
793 | |
695 | reconnect_all (); |
794 | reconnect_all (); |
696 | } |
795 | } |
697 | |
796 | |
698 | events = 0; |
797 | events = 0; |
… | |
… | |
714 | |
813 | |
715 | conns.clear (); |
814 | conns.clear (); |
716 | |
815 | |
717 | connection_init (); |
816 | connection_init (); |
718 | |
817 | |
719 | for (configuration::node_vector::iterator i = conf.nodes.begin (); |
818 | for (configuration::node_vector::iterator i = conf.nodes.begin (); i != conf.nodes.end (); ++i) |
720 | i != conf.nodes.end (); ++i) |
819 | conns.push_back (new connection (this, *i)); |
721 | { |
820 | |
722 | connection *conn = new connection (this, *i); |
821 | for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c) |
723 | conns.push_back (conn); |
|
|
724 | conn->establish_connection (); |
822 | (*c)->establish_connection (); |
725 | } |
|
|
726 | } |
823 | } |
727 | |
824 | |
728 | connection *vpn::find_router () |
825 | bool |
|
|
826 | vpn::can_direct (conf_node *src, conf_node *dst) const |
729 | { |
827 | { |
730 | u32 prio = 1; |
828 | return src != dst |
|
|
829 | && src->may_direct (dst) |
|
|
830 | && dst->may_direct (src) |
|
|
831 | && (((src->protocols & dst->protocols) && src->connectmode == conf_node::C_ALWAYS) |
|
|
832 | || (src->protocols & dst->connectable_protocols ())); |
|
|
833 | } |
|
|
834 | |
|
|
835 | // only works for indirect and routed connections: find a router |
|
|
836 | // from THISNODE to dst |
|
|
837 | connection * |
|
|
838 | vpn::find_router_for (const connection *dst) |
|
|
839 | { |
731 | connection *router = 0; |
840 | connection *router = 0; |
732 | |
841 | |
|
|
842 | // first try to find a router with a direct connection, route there |
|
|
843 | // regardless of any other considerations. |
|
|
844 | { |
|
|
845 | u32 prio = 1; |
|
|
846 | |
|
|
847 | for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i) |
|
|
848 | { |
|
|
849 | connection *c = *i; |
|
|
850 | |
|
|
851 | if (c->conf->routerprio > prio |
|
|
852 | && c->conf != THISNODE |
|
|
853 | && can_direct (c->conf, dst->conf) |
|
|
854 | && c->ictx && c->octx) |
|
|
855 | { |
|
|
856 | prio = c->conf->routerprio; |
|
|
857 | router = c; |
|
|
858 | } |
|
|
859 | } |
|
|
860 | } |
|
|
861 | |
|
|
862 | if (router) |
|
|
863 | return router; |
|
|
864 | |
|
|
865 | // second try find the router with the highest priority, higher than ours |
|
|
866 | { |
|
|
867 | u32 prio = THISNODE->routerprio ? THISNODE->routerprio : 1; |
|
|
868 | |
|
|
869 | for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i) |
|
|
870 | { |
|
|
871 | connection *c = *i; |
|
|
872 | |
|
|
873 | if (c->conf->routerprio > prio |
|
|
874 | && c != dst |
|
|
875 | && c->conf != THISNODE |
|
|
876 | && c->ictx && c->octx) |
|
|
877 | { |
|
|
878 | prio = c->conf->routerprio; |
|
|
879 | router = c; |
|
|
880 | } |
|
|
881 | } |
|
|
882 | } |
|
|
883 | |
|
|
884 | return router; |
|
|
885 | } |
|
|
886 | |
|
|
887 | void |
|
|
888 | vpn::connection_established (connection *c) |
|
|
889 | { |
733 | for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i) |
890 | for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i) |
734 | { |
891 | { |
735 | connection *c = *i; |
892 | connection *o = *i; |
736 | |
893 | |
737 | if (c->conf->routerprio > prio |
894 | if (o->si.valid () |
738 | && c->connectmode == conf_node::C_ALWAYS // so we don't drop the connection if in use |
895 | && c->si != o->si |
739 | && c->ictx && c->octx |
896 | && c == find_router_for (o) |
740 | && c->conf != THISNODE) // redundant, since ictx==octx==0 always on thisnode |
897 | && !can_direct (THISNODE, o->conf)) |
741 | { |
|
|
742 | prio = c->conf->routerprio; |
|
|
743 | router = c; |
|
|
744 | } |
898 | { |
|
|
899 | slog (L_DEBUG, _("%s: can now route packets via %s, re-keying connection."), |
|
|
900 | o->conf->nodename, c->conf->nodename); |
|
|
901 | o->rekey (); |
|
|
902 | } |
745 | } |
903 | } |
746 | |
|
|
747 | return router; |
|
|
748 | } |
904 | } |
749 | |
905 | |
|
|
906 | void |
750 | void vpn::send_connect_request (int id) |
907 | vpn::send_connect_request (connection *c) |
751 | { |
908 | { |
752 | connection *c = find_router (); |
909 | connection *r = find_router_for (c); |
753 | |
910 | |
754 | if (c) |
911 | if (r) |
|
|
912 | { |
|
|
913 | slog (L_TRACE, _("%s: no address known, sending mediated connection request via %s."), |
|
|
914 | c->conf->nodename, r->conf->nodename); |
755 | c->send_connect_request (id); |
915 | r->send_connect_request (c->conf->id); |
|
|
916 | } |
756 | else |
917 | else |
757 | // no router found, aggressively connect to all routers |
918 | slog (L_DEBUG, _("%s: no way to connect and no router found: unable to connect at this time."), |
758 | for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i) |
919 | c->conf->nodename); |
759 | if ((*i)->conf->routerprio && (*i)->conf != THISNODE) |
|
|
760 | (*i)->establish_connection (); |
|
|
761 | } |
920 | } |
762 | |
921 | |
763 | void |
922 | void |
764 | connection::dump_status () |
923 | connection::dump_status () |
765 | { |
924 | { |
766 | slog (L_NOTICE, _("node %s (id %d)"), conf->nodename, conf->id); |
925 | slog (L_NOTICE, _("node %s (id %d)"), conf->nodename, conf->id); |
767 | slog (L_NOTICE, _(" connectmode %d (%d) / sockaddr %s / minor %d"), |
926 | slog (L_NOTICE, _(" connectmode %d (%d) / sockaddr %s / minor %d"), |
768 | connectmode, conf->connectmode, (const char *)si, (int)prot_minor); |
927 | connectmode, conf->connectmode, (const char *)si, (int)prot_minor); |
769 | slog (L_NOTICE, _(" ictx/octx %08lx/%08lx / oseqno %d / retry_cnt %d"), |
928 | slog (L_NOTICE, _(" ictx/octx %08lx/%08lx / oseqno %d / retry_cnt %d"), |
770 | (long)ictx, (long)octx, (int)oseqno, (int)retry_cnt); |
929 | (long)ictx, (long)octx, (int)oseqno, (int)retry_cnt); |
771 | slog (L_NOTICE, _(" establish_conn %ld / rekey %ld / keepalive %ld"), |
|
|
772 | (long)(establish_connection.at), (long)(rekey.at), (long)(keepalive.at)); |
|
|
773 | } |
930 | } |
774 | |
931 | |
775 | void |
932 | void |
776 | vpn::dump_status () |
933 | vpn::dump_status () |
777 | { |
934 | { |