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 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> |
… | |
… | |
110 | |
120 | |
111 | return filename; |
121 | return filename; |
112 | } |
122 | } |
113 | |
123 | |
114 | int |
124 | int |
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125 | vpn::setup_socket (u8 prot, int family, int type, int proto) |
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126 | { |
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127 | int fd = socket (family, type, proto); |
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128 | |
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129 | if (fd < 0) |
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130 | { |
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131 | slog (L_ERR, _("unable to create %s socket: %s."), strprotocol (prot), strerror (errno)); |
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132 | return fd; |
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133 | } |
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134 | |
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135 | fcntl (fd, F_SETFL, O_NONBLOCK); |
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136 | fcntl (fd, F_SETFD, FD_CLOEXEC); |
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137 | |
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138 | #ifdef SO_MARK |
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139 | if (::conf.nfmark) |
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140 | if (setsockopt (fd, SOL_SOCKET, SO_MARK, &::conf.nfmark, sizeof ::conf.nfmark)) |
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141 | slog (L_WARN, _("unable to set nfmark on %s socket: %s"), strprotocol (prot), strerror (errno)); |
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142 | #endif |
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143 | |
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144 | return fd; |
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145 | } |
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146 | |
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147 | int |
115 | vpn::setup () |
148 | vpn::setup () |
116 | { |
149 | { |
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150 | int success = 0; |
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151 | |
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152 | #if 1//D2 |
117 | ipv4_tos = -1; |
153 | ipv42_tos = -1; |
118 | ipv4_fd = -1; |
154 | ipv42_fd = -1; |
119 | |
155 | |
120 | if (THISNODE->protocols & PROT_IPv4 && ::conf.ip_proto) |
156 | if (THISNODE->protocols & PROT_IPv42 && ::conf.ip_proto) |
121 | { |
157 | { |
122 | ipv4_fd = socket (PF_INET, SOCK_RAW, ::conf.ip_proto); |
158 | ipv42_fd = setup_socket (PROT_IPv42, PF_INET, SOCK_RAW, ::conf.ip2_proto); |
123 | |
159 | |
124 | if (ipv4_fd < 0) |
160 | if (ipv42_fd < 0) |
125 | return -1; |
161 | 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 | |
162 | |
130 | #if defined(SOL_IP) && defined(IP_MTU_DISCOVER) |
163 | #if defined(SOL_IP) && defined(IP_MTU_DISCOVER) |
131 | // this I really consider a linux bug. I am neither connected |
164 | // this I really consider a linux bug. I am neither connected |
132 | // nor do I fragment myself. Linux still sets DF and doesn't |
165 | // nor do I fragment myself. Linux still sets DF and doesn't |
133 | // fragment for me sometimes. |
166 | // fragment for me sometimes. |
134 | { |
167 | { |
135 | int oval = IP_PMTUDISC_DONT; |
168 | int oval = IP_PMTUDISC_DONT; |
136 | setsockopt (ipv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval); |
169 | setsockopt (ipv42_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval); |
137 | } |
170 | } |
138 | #endif |
171 | #endif |
139 | |
172 | |
140 | sockinfo si (THISNODE, PROT_IPv4); |
173 | sockinfo si (THISNODE, PROT_IPv42); |
141 | |
174 | |
142 | if (bind (ipv4_fd, si.sav4 (), si.salenv4 ())) |
175 | if (bind (ipv42_fd, si.sav4 (), si.salenv4 ())) |
143 | { |
176 | { |
144 | slog (L_ERR, _("can't bind ipv4 socket on %s: %s"), (const char *)si, strerror (errno)); |
177 | slog (L_ERR, _("can't bind ipv42 socket on %s: %s, exiting."), (const char *)si, strerror (errno)); |
145 | exit (EXIT_FAILURE); |
178 | return -1; |
146 | } |
179 | } |
147 | |
180 | |
148 | ipv4_ev_watcher.start (ipv4_fd, EV_READ); |
181 | ipv42_ev_watcher.start (ipv42_fd, EV_READ); |
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182 | ++success; |
149 | } |
183 | } |
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184 | else |
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185 | THISNODE->protocols &= ~PROT_IPv42; |
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186 | #endif |
150 | |
187 | |
151 | udpv4_tos = -1; |
188 | ipv4_tos = -1; |
152 | udpv4_fd = -1; |
189 | ipv4_fd = -1; |
153 | |
190 | |
154 | if (THISNODE->protocols & PROT_UDPv4 && THISNODE->udp_port) |
191 | if (THISNODE->protocols & PROT_IPv4 && ::conf.ip_proto) |
155 | { |
192 | { |
156 | udpv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP); |
193 | ipv4_fd = setup_socket (PROT_IPv4, PF_INET, SOCK_RAW, ::conf.ip_proto); |
157 | |
194 | |
158 | if (udpv4_fd < 0) |
195 | if (ipv4_fd < 0) |
159 | return -1; |
196 | 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 | |
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164 | // standard daemon practise... |
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165 | { |
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166 | int oval = 1; |
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167 | setsockopt (udpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval); |
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168 | } |
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169 | |
197 | |
170 | #if defined(SOL_IP) && defined(IP_MTU_DISCOVER) |
198 | #if defined(SOL_IP) && defined(IP_MTU_DISCOVER) |
171 | // this I really consider a linux bug. I am neither connected |
199 | // this I really consider a linux bug. I am neither connected |
172 | // nor do I fragment myself. Linux still sets DF and doesn't |
200 | // nor do I fragment myself. Linux still sets DF and doesn't |
173 | // fragment for me sometimes. |
201 | // fragment for me sometimes. |
174 | { |
202 | { |
175 | int oval = IP_PMTUDISC_DONT; |
203 | int oval = IP_PMTUDISC_DONT; |
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204 | setsockopt (ipv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval); |
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205 | } |
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206 | #endif |
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207 | |
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208 | sockinfo si (THISNODE, PROT_IPv4); |
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209 | |
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210 | if (bind (ipv4_fd, si.sav4 (), si.salenv4 ())) |
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211 | { |
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212 | slog (L_ERR, _("can't bind ipv4 socket on %s: %s, exiting."), (const char *)si, strerror (errno)); |
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213 | return -1; |
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214 | } |
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215 | |
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216 | ipv4_ev_watcher.start (ipv4_fd, EV_READ); |
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217 | ++success; |
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218 | } |
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219 | else |
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220 | THISNODE->protocols &= ~PROT_IPv4; |
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221 | |
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222 | udpv4_tos = -1; |
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223 | udpv4_fd = -1; |
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224 | |
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225 | if (THISNODE->protocols & PROT_UDPv4 && THISNODE->udp_port) |
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226 | { |
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227 | udpv4_fd = setup_socket (PROT_UDPv4, PF_INET, SOCK_DGRAM, IPPROTO_UDP); |
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228 | |
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229 | if (udpv4_fd < 0) |
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230 | return -1; |
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231 | |
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232 | // standard daemon practise... |
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233 | { |
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234 | int oval = 1; |
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235 | setsockopt (udpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval); |
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236 | } |
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237 | |
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238 | #if defined(SOL_IP) && defined(IP_MTU_DISCOVER) |
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239 | // this I really consider a linux bug. I am neither connected |
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240 | // nor do I fragment myself. Linux still sets DF and doesn't |
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241 | // fragment for me sometimes. |
|
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242 | { |
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243 | int oval = IP_PMTUDISC_DONT; |
176 | setsockopt (udpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval); |
244 | setsockopt (udpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval); |
177 | } |
245 | } |
178 | #endif |
246 | #endif |
179 | |
247 | |
180 | sockinfo si (THISNODE, PROT_UDPv4); |
248 | sockinfo si (THISNODE, PROT_UDPv4); |
181 | |
249 | |
182 | if (bind (udpv4_fd, si.sav4 (), si.salenv4 ())) |
250 | if (bind (udpv4_fd, si.sav4 (), si.salenv4 ())) |
183 | { |
251 | { |
184 | slog (L_ERR, _("can't bind udpv4 on %s: %s"), (const char *)si, strerror (errno)); |
252 | slog (L_ERR, _("can't bind udpv4 on %s: %s, exiting."), (const char *)si, strerror (errno)); |
185 | exit (EXIT_FAILURE); |
253 | return -1; |
186 | } |
254 | } |
187 | |
255 | |
188 | udpv4_ev_watcher.start (udpv4_fd, EV_READ); |
256 | udpv4_ev_watcher.start (udpv4_fd, EV_READ); |
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257 | ++success; |
189 | } |
258 | } |
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259 | else |
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260 | THISNODE->protocols &= ~PROT_UDPv4; |
190 | |
261 | |
191 | icmpv4_tos = -1; |
262 | icmpv4_tos = -1; |
192 | icmpv4_fd = -1; |
263 | icmpv4_fd = -1; |
193 | |
264 | |
194 | #if ENABLE_ICMP |
265 | #if ENABLE_ICMP |
195 | if (THISNODE->protocols & PROT_ICMPv4) |
266 | if (THISNODE->protocols & PROT_ICMPv4) |
196 | { |
267 | { |
197 | icmpv4_fd = socket (PF_INET, SOCK_RAW, IPPROTO_ICMP); |
268 | icmpv4_fd = setup_socket (PROT_ICMPv4, PF_INET, SOCK_RAW, IPPROTO_ICMP); |
198 | |
269 | |
199 | if (icmpv4_fd < 0) |
270 | if (icmpv4_fd < 0) |
200 | return -1; |
271 | 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 | |
272 | |
205 | #ifdef ICMP_FILTER |
273 | #ifdef ICMP_FILTER |
206 | { |
274 | { |
207 | icmp_filter oval; |
275 | icmp_filter oval; |
208 | oval.data = 0xffffffff; |
276 | oval.data = 0xffffffff; |
… | |
… | |
225 | |
293 | |
226 | sockinfo si (THISNODE, PROT_ICMPv4); |
294 | sockinfo si (THISNODE, PROT_ICMPv4); |
227 | |
295 | |
228 | if (bind (icmpv4_fd, si.sav4 (), si.salenv4 ())) |
296 | if (bind (icmpv4_fd, si.sav4 (), si.salenv4 ())) |
229 | { |
297 | { |
230 | slog (L_ERR, _("can't bind icmpv4 on %s: %s"), (const char *)si, strerror (errno)); |
298 | slog (L_ERR, _("can't bind icmpv4 on %s: %s, exiting."), (const char *)si, strerror (errno)); |
231 | exit (EXIT_FAILURE); |
299 | return -1; |
232 | } |
300 | } |
233 | |
301 | |
234 | icmpv4_ev_watcher.start (icmpv4_fd, EV_READ); |
302 | icmpv4_ev_watcher.start (icmpv4_fd, EV_READ); |
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303 | ++success; |
235 | } |
304 | } |
236 | #endif |
305 | #endif |
237 | |
306 | |
238 | tcpv4_fd = -1; |
307 | tcpv4_fd = -1; |
239 | |
308 | |
240 | #if ENABLE_TCP |
309 | #if ENABLE_TCP |
241 | if (THISNODE->protocols & PROT_TCPv4 && THISNODE->tcp_port) |
310 | if (THISNODE->protocols & PROT_TCPv4 && THISNODE->tcp_port) |
242 | { |
311 | { |
243 | tcpv4_fd = socket (PF_INET, SOCK_STREAM, IPPROTO_TCP); |
312 | tcpv4_fd = setup_socket (PROT_TCPv4, PF_INET, SOCK_STREAM, IPPROTO_TCP); |
244 | |
313 | |
245 | if (tcpv4_fd < 0) |
314 | if (tcpv4_fd < 0) |
246 | return -1; |
315 | return -1; |
247 | |
316 | |
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... |
317 | // standard daemon practise... |
252 | { |
318 | { |
253 | int oval = 1; |
319 | int oval = 1; |
254 | setsockopt (tcpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval); |
320 | setsockopt (tcpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval); |
255 | } |
321 | } |
256 | |
322 | |
257 | sockinfo si (THISNODE, PROT_TCPv4); |
323 | sockinfo si (THISNODE, PROT_TCPv4); |
258 | |
324 | |
259 | if (bind (tcpv4_fd, si.sav4 (), si.salenv4 ())) |
325 | if (bind (tcpv4_fd, si.sav4 (), si.salenv4 ())) |
260 | { |
326 | { |
261 | slog (L_ERR, _("can't bind tcpv4 on %s: %s"), (const char *)si, strerror (errno)); |
327 | slog (L_ERR, _("can't bind tcpv4 on %s: %s, exiting."), (const char *)si, strerror (errno)); |
262 | exit (EXIT_FAILURE); |
328 | return -1; |
263 | } |
329 | } |
264 | |
330 | |
265 | if (listen (tcpv4_fd, 5)) |
331 | if (listen (tcpv4_fd, 5)) |
266 | { |
332 | { |
267 | slog (L_ERR, _("can't listen tcpv4 on %s: %s"), (const char *)si, strerror (errno)); |
333 | slog (L_ERR, _("can't listen tcpv4 on %s: %s, exiting."), (const char *)si, strerror (errno)); |
268 | exit (EXIT_FAILURE); |
334 | return -1; |
269 | } |
335 | } |
270 | |
336 | |
271 | tcpv4_ev_watcher.start (tcpv4_fd, EV_READ); |
337 | tcpv4_ev_watcher.start (tcpv4_fd, EV_READ); |
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338 | ++success; |
272 | } |
339 | } |
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340 | else |
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341 | THISNODE->protocols &= ~PROT_TCPv4; |
273 | #endif |
342 | #endif |
274 | |
343 | |
275 | dnsv4_tos = -1; |
344 | dnsv4_tos = -1; |
276 | dnsv4_fd = -1; |
345 | dnsv4_fd = -1; |
277 | |
346 | |
278 | #if ENABLE_DNS |
347 | #if ENABLE_DNS |
279 | if (THISNODE->protocols & PROT_DNSv4) |
348 | if (THISNODE->protocols & PROT_DNSv4) |
280 | { |
349 | { |
281 | dns_forwarder.set (::conf.dns_forw_host, ::conf.dns_forw_port, PROT_DNSv4); |
350 | dns_forwarder.set (::conf.dns_forw_host, ::conf.dns_forw_port, PROT_DNSv4); |
282 | |
351 | |
283 | dnsv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP); |
352 | dnsv4_fd = setup_socket (PROT_DNSv4, PF_INET, SOCK_DGRAM, IPPROTO_UDP); |
284 | |
353 | |
285 | if (dnsv4_fd < 0) |
354 | if (dnsv4_fd < 0) |
286 | return -1; |
355 | 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 | |
356 | |
291 | # if defined(SOL_IP) && defined(IP_MTU_DISCOVER) |
357 | # if defined(SOL_IP) && defined(IP_MTU_DISCOVER) |
292 | // this I really consider a linux bug. I am neither connected |
358 | // this I really consider a linux bug. I am neither connected |
293 | // nor do I fragment myself. Linux still sets DF and doesn't |
359 | // nor do I fragment myself. Linux still sets DF and doesn't |
294 | // fragment for me sometimes. |
360 | // fragment for me sometimes. |
… | |
… | |
308 | THISNODE->dns_hostname ? THISNODE->dns_port : 0, |
374 | THISNODE->dns_hostname ? THISNODE->dns_port : 0, |
309 | PROT_DNSv4); |
375 | PROT_DNSv4); |
310 | |
376 | |
311 | if (bind (dnsv4_fd, si.sav4 (), si.salenv4 ())) |
377 | if (bind (dnsv4_fd, si.sav4 (), si.salenv4 ())) |
312 | { |
378 | { |
313 | slog (L_ERR, _("can't bind dnsv4 on %s: %s"), (const char *)si, strerror (errno)); |
379 | slog (L_ERR, _("can't bind dnsv4 on %s: %s, exiting."), (const char *)si, strerror (errno)); |
314 | exit (EXIT_FAILURE); |
380 | return -1; |
315 | } |
381 | } |
316 | |
382 | |
317 | dnsv4_ev_watcher.start (dnsv4_fd, EV_READ); |
383 | dnsv4_ev_watcher.start (dnsv4_fd, EV_READ); |
|
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384 | ++success; |
318 | } |
385 | } |
319 | #endif |
386 | #endif |
320 | |
387 | |
321 | ///////////////////////////////////////////////////////////////////////////// |
388 | ///////////////////////////////////////////////////////////////////////////// |
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389 | |
|
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390 | if (!success) |
|
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391 | { |
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392 | slog (L_ERR, _("no protocols enabled.")); |
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393 | return -1; |
|
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394 | } |
322 | |
395 | |
323 | reconnect_all (); |
396 | reconnect_all (); |
324 | |
397 | |
325 | ///////////////////////////////////////////////////////////////////////////// |
398 | ///////////////////////////////////////////////////////////////////////////// |
326 | |
399 | |
327 | tap = new tap_device (); |
400 | tap = new tap_device (); |
328 | if (!tap) //D this, of course, never catches |
401 | if (!tap) //D this, of course, never catches |
329 | { |
402 | { |
330 | slog (L_ERR, _("cannot create network interface '%s'"), conf.ifname); |
403 | slog (L_ERR, _("cannot create network interface '%s'."), conf.ifname); |
331 | exit (EXIT_FAILURE); |
404 | return -1; |
332 | } |
405 | } |
333 | |
406 | |
334 | fcntl (tap->fd, F_SETFD, FD_CLOEXEC); |
407 | fcntl (tap->fd, F_SETFD, FD_CLOEXEC); |
335 | |
408 | |
336 | run_script_cb cb; |
409 | run_script_cb cb; |
337 | cb.set<vpn, &vpn::script_if_init> (this); |
410 | cb.set<vpn, &vpn::script_if_init> (this); |
338 | |
411 | |
339 | if (tap->if_up () && |
412 | if (tap->if_up () && |
340 | !run_script (cb, true)) |
413 | !run_script (cb, true)) |
341 | { |
414 | { |
342 | slog (L_ERR, _("interface initialization command '%s' failed, exiting."), |
415 | slog (L_ERR, _("interface initialization command '%s' failed."), |
343 | tap->if_up ()); |
416 | tap->if_up ()); |
344 | exit (EXIT_FAILURE); |
417 | return -1; |
345 | } |
418 | } |
346 | |
419 | |
347 | cb.set<vpn, &vpn::script_if_up> (this); |
420 | cb.set<vpn, &vpn::script_if_up> (this); |
348 | if (!run_script (cb, true)) |
421 | if (!run_script (cb, true)) |
349 | { |
422 | { |
350 | slog (L_ERR, _("if-up command execution failed, exiting.")); |
423 | slog (L_ERR, _("if-up command execution failed.")); |
351 | exit (EXIT_FAILURE); |
424 | return -1; |
352 | } |
425 | } |
353 | |
426 | |
354 | tap_ev_watcher.start (tap->fd, EV_READ); |
427 | tap_ev_watcher.start (tap->fd, EV_READ); |
355 | |
428 | |
356 | return 0; |
429 | return 0; |
… | |
… | |
362 | set_tos (ipv4_fd, ipv4_tos, tos); |
435 | set_tos (ipv4_fd, ipv4_tos, tos); |
363 | sendto (ipv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ()); |
436 | sendto (ipv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ()); |
364 | |
437 | |
365 | return true; |
438 | return true; |
366 | } |
439 | } |
|
|
440 | |
|
|
441 | #if 1 //D |
|
|
442 | bool |
|
|
443 | vpn::send_ipv42_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
|
|
444 | { |
|
|
445 | set_tos (ipv42_fd, ipv42_tos, tos); |
|
|
446 | sendto (ipv42_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ()); |
|
|
447 | |
|
|
448 | return true; |
|
|
449 | } |
|
|
450 | #endif |
367 | |
451 | |
368 | static u16 |
452 | static u16 |
369 | ipv4_checksum (u16 *data, unsigned int len) |
453 | ipv4_checksum (u16 *data, unsigned int len) |
370 | { |
454 | { |
371 | // use 32 bit accumulator and fold back carry bits at the end |
455 | // use 32 bit accumulator and fold back carry bits at the end |
… | |
… | |
429 | { |
513 | { |
430 | // broadcast, this is ugly, but due to the security policy |
514 | // broadcast, this is ugly, but due to the security policy |
431 | // we have to connect to all hosts... |
515 | // we have to connect to all hosts... |
432 | for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c) |
516 | for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c) |
433 | if ((*c)->conf != THISNODE) |
517 | if ((*c)->conf != THISNODE) |
434 | (*c)->inject_data_packet (pkt, true); |
518 | (*c)->inject_data_packet (pkt); |
435 | } |
519 | } |
436 | } |
520 | } |
437 | |
521 | |
438 | void |
522 | void |
439 | vpn::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi) |
523 | vpn::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi) |
440 | { |
524 | { |
441 | unsigned int src = pkt->src (); |
525 | unsigned int src = pkt->src (); |
442 | unsigned int dst = pkt->dst (); |
526 | unsigned int dst = pkt->dst (); |
443 | |
527 | |
444 | slog (L_NOISE, _("<<?/%s received possible vpn packet type %d from %d to %d, length %d"), |
528 | 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); |
529 | (const char *)rsi, pkt->typ (), pkt->src (), pkt->dst (), pkt->len); |
446 | |
530 | |
447 | if (src == 0 || src > conns.size () |
531 | if (src == 0 || src > conns.size () |
448 | || dst > conns.size () |
532 | || dst > conns.size () |
449 | || pkt->typ () >= vpn_packet::PT_MAX) |
533 | || pkt->typ () >= vpn_packet::PT_MAX) |
450 | slog (L_WARN, _("(%s): received corrupted packet type %d (src %d, dst %d)"), |
534 | slog (L_WARN, _("(%s): received corrupted packet type %d (src %d, dst %d)."), |
451 | (const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ()); |
535 | (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 ()); |
|
|
455 | else |
536 | else |
456 | { |
537 | { |
457 | connection *c = conns[src - 1]; |
538 | connection *c = conns[src - 1]; |
458 | |
539 | |
459 | if (dst == 0) |
540 | if (dst == 0) |
460 | slog (L_WARN, _("%s(%s): received broadcast (protocol violation)"), |
541 | slog (L_WARN, _("%s(%s): received broadcast (protocol violation)."), |
461 | c->conf->nodename, (const char *)rsi); |
542 | c->conf->nodename, (const char *)rsi); |
462 | else if (dst != THISNODE->id) |
543 | else if (dst != THISNODE->id) |
463 | { |
544 | { |
464 | if (THISNODE->routerprio) |
545 | if (THISNODE->routerprio) |
465 | // the tos setting gets lost here. who cares. |
546 | // the tos setting gets lost here. who cares. |
466 | conns[dst - 1]->inject_vpn_packet (pkt); |
547 | conns[dst - 1]->inject_vpn_packet (pkt); |
467 | else |
548 | else |
468 | slog (L_WARN, |
549 | slog (L_WARN, |
469 | _("%s(%s): forwarding request (=> %s), but we are no router"), |
550 | _("%s(%s): request to forward packet to %s, but we are no router (config mismatch?)."), |
470 | c->conf->nodename, (const char *)rsi, |
551 | c->conf->nodename, (const char *)rsi, |
471 | conns[dst - 1]->conf->nodename); |
552 | conns[dst - 1]->conf->nodename); |
472 | } |
553 | } |
473 | else |
554 | else |
474 | c->recv_vpn_packet (pkt, rsi); |
555 | c->recv_vpn_packet (pkt, rsi); |
… | |
… | |
478 | bool |
559 | bool |
479 | vpn::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
560 | vpn::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
480 | { |
561 | { |
481 | switch (si.prot) |
562 | switch (si.prot) |
482 | { |
563 | { |
|
|
564 | #if 1//D2 |
|
|
565 | case PROT_IPv42: |
|
|
566 | return send_ipv42_packet (pkt, si, tos); |
|
|
567 | #endif |
|
|
568 | |
483 | case PROT_IPv4: |
569 | case PROT_IPv4: |
484 | return send_ipv4_packet (pkt, si, tos); |
570 | return send_ipv4_packet (pkt, si, tos); |
485 | |
571 | |
486 | case PROT_UDPv4: |
572 | case PROT_UDPv4: |
487 | return send_udpv4_packet (pkt, si, tos); |
573 | return send_udpv4_packet (pkt, si, tos); |
488 | |
574 | |
489 | #if ENABLE_TCP |
575 | #if ENABLE_TCP |
490 | case PROT_TCPv4: |
576 | case PROT_TCPv4: |
491 | return send_tcpv4_packet (pkt, si, tos); |
577 | return send_tcpv4_packet (pkt, si, tos); |
492 | #endif |
578 | #endif |
493 | #if ENABLE_ICMP |
579 | #if ENABLE_ICMP |
494 | case PROT_ICMPv4: |
580 | case PROT_ICMPv4: |
… | |
… | |
497 | #if ENABLE_DNS |
583 | #if ENABLE_DNS |
498 | case PROT_DNSv4: |
584 | case PROT_DNSv4: |
499 | return send_dnsv4_packet (pkt, si, tos); |
585 | return send_dnsv4_packet (pkt, si, tos); |
500 | #endif |
586 | #endif |
501 | default: |
587 | default: |
502 | slog (L_CRIT, _("%s: FATAL: trying to send packet with unsupported protocol"), (const char *)si); |
588 | slog (L_CRIT, _("%s: FATAL: trying to send packet with unsupported protocol."), (const char *)si); |
503 | } |
589 | } |
504 | |
590 | |
505 | return false; |
591 | return false; |
506 | } |
592 | } |
507 | |
593 | |
|
|
594 | #if 1//D2 |
508 | inline void |
595 | inline void |
509 | vpn::ipv4_ev (ev::io &w, int revents) |
596 | vpn::ipv42_ev (ev::io &w, int revents) |
510 | { |
597 | { |
511 | if (revents & EV_READ) |
598 | if (revents & EV_READ) |
512 | { |
599 | { |
513 | vpn_packet *pkt = new vpn_packet; |
600 | vpn_packet *pkt = new vpn_packet; |
514 | struct sockaddr_in sa; |
601 | struct sockaddr_in sa; |
515 | socklen_t sa_len = sizeof (sa); |
602 | socklen_t sa_len = sizeof (sa); |
516 | int len; |
603 | int len; |
517 | |
604 | |
518 | len = recvfrom (w.fd, &((*pkt)[0]), MAXSIZE, 0, (sockaddr *)&sa, &sa_len); |
605 | len = recvfrom (w.fd, &((*pkt)[0]), MAXSIZE, 0, (sockaddr *)&sa, &sa_len); |
519 | |
606 | |
|
|
607 | sockinfo si(sa, PROT_IPv42); |
|
|
608 | |
|
|
609 | if (len > 0) |
|
|
610 | { |
|
|
611 | pkt->len = len; |
|
|
612 | |
|
|
613 | // raw sockets deliver the ipv4 header, but don't expect it on sends |
|
|
614 | pkt->skip_hdr (pkt->ipv4_hdr_len ()); |
|
|
615 | |
|
|
616 | recv_vpn_packet (pkt, si); |
|
|
617 | } |
|
|
618 | else |
|
|
619 | { |
|
|
620 | // probably ECONNRESET or somesuch |
|
|
621 | slog (L_DEBUG, _("%s: %s."), (const char *)si, strerror (errno)); |
|
|
622 | } |
|
|
623 | |
|
|
624 | delete pkt; |
|
|
625 | } |
|
|
626 | else |
|
|
627 | { |
|
|
628 | slog (L_ERR, |
|
|
629 | _("FATAL: unknown revents %08x in socket, exiting.\n"), |
|
|
630 | revents); |
|
|
631 | exit (EXIT_FAILURE); |
|
|
632 | } |
|
|
633 | } |
|
|
634 | #endif |
|
|
635 | |
|
|
636 | inline void |
|
|
637 | vpn::ipv4_ev (ev::io &w, int revents) |
|
|
638 | { |
|
|
639 | if (revents & EV_READ) |
|
|
640 | { |
|
|
641 | vpn_packet *pkt = new vpn_packet; |
|
|
642 | struct sockaddr_in sa; |
|
|
643 | socklen_t sa_len = sizeof (sa); |
|
|
644 | int len; |
|
|
645 | |
|
|
646 | len = recvfrom (w.fd, &((*pkt)[0]), MAXSIZE, 0, (sockaddr *)&sa, &sa_len); |
|
|
647 | |
520 | sockinfo si(sa, PROT_IPv4); |
648 | sockinfo si(sa, PROT_IPv4); |
521 | |
649 | |
522 | if (len > 0) |
650 | if (len > 0) |
523 | { |
651 | { |
524 | pkt->len = len; |
652 | pkt->len = len; |
525 | |
653 | |
526 | // raw sockets deliver the ipv4 header, but don't expect it on sends |
654 | // raw sockets deliver the ipv4 header, but don't expect it on sends |
527 | pkt->skip_hdr (IP_OVERHEAD); |
655 | pkt->skip_hdr (pkt->ipv4_hdr_len ()); |
528 | |
656 | |
529 | recv_vpn_packet (pkt, si); |
657 | recv_vpn_packet (pkt, si); |
530 | } |
658 | } |
531 | else |
659 | else |
532 | { |
660 | { |
533 | // probably ECONNRESET or somesuch |
661 | // probably ECONNRESET or somesuch |
534 | slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno)); |
662 | slog (L_DEBUG, _("%s: %s."), (const char *)si, strerror (errno)); |
535 | } |
663 | } |
536 | |
664 | |
537 | delete pkt; |
665 | delete pkt; |
538 | } |
666 | } |
539 | else |
667 | else |
540 | { |
668 | { |
541 | slog (L_ERR, |
669 | slog (L_ERR, |
542 | _("FATAL: unknown revents %08x in socket, terminating\n"), |
670 | _("FATAL: unknown revents %08x in socket, exiting.\n"), |
543 | revents); |
671 | revents); |
544 | exit (EXIT_FAILURE); |
672 | exit (EXIT_FAILURE); |
545 | } |
673 | } |
546 | } |
674 | } |
547 | |
675 | |
… | |
… | |
569 | if (hdr->type == ::conf.icmp_type |
697 | if (hdr->type == ::conf.icmp_type |
570 | && hdr->code == 255) |
698 | && hdr->code == 255) |
571 | { |
699 | { |
572 | // raw sockets deliver the ipv4, but don't expect it on sends |
700 | // raw sockets deliver the ipv4, but don't expect it on sends |
573 | // this is slow, but... |
701 | // this is slow, but... |
574 | pkt->skip_hdr (ICMP_OVERHEAD); |
702 | pkt->skip_hdr (pkt->ipv4_hdr_len () + (ICMP_OVERHEAD - IP_OVERHEAD)); |
575 | |
703 | |
576 | recv_vpn_packet (pkt, si); |
704 | recv_vpn_packet (pkt, si); |
577 | } |
705 | } |
578 | } |
706 | } |
579 | else |
707 | else |
580 | { |
708 | { |
581 | // probably ECONNRESET or somesuch |
709 | // probably ECONNRESET or somesuch |
582 | slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno)); |
710 | slog (L_DEBUG, _("%s: %s."), (const char *)si, strerror (errno)); |
583 | } |
711 | } |
584 | |
712 | |
585 | delete pkt; |
713 | delete pkt; |
586 | } |
714 | } |
587 | else |
715 | else |
588 | { |
716 | { |
589 | slog (L_ERR, |
717 | slog (L_ERR, |
590 | _("FATAL: unknown revents %08x in socket, terminating\n"), |
718 | _("FATAL: unknown revents %08x in socket, exiting.\n"), |
591 | revents); |
719 | revents); |
592 | exit (EXIT_FAILURE); |
720 | exit (EXIT_FAILURE); |
593 | } |
721 | } |
594 | } |
722 | } |
595 | #endif |
723 | #endif |
… | |
… | |
615 | recv_vpn_packet (pkt, si); |
743 | recv_vpn_packet (pkt, si); |
616 | } |
744 | } |
617 | else |
745 | else |
618 | { |
746 | { |
619 | // probably ECONNRESET or somesuch |
747 | // probably ECONNRESET or somesuch |
620 | slog (L_DEBUG, _("%s: fd %d, %s"), (const char *)si, w.fd, strerror (errno)); |
748 | slog (L_DEBUG, _("%s: fd %d, %s."), (const char *)si, w.fd, strerror (errno)); |
621 | } |
749 | } |
622 | |
750 | |
623 | delete pkt; |
751 | delete pkt; |
624 | } |
752 | } |
625 | else |
753 | else |
626 | { |
754 | { |
627 | slog (L_ERR, |
755 | slog (L_ERR, |
628 | _("FATAL: unknown revents %08x in socket, terminating\n"), |
756 | _("FATAL: unknown revents %08x in socket, exiting.\n"), |
629 | revents); |
757 | revents); |
630 | exit (EXIT_FAILURE); |
758 | exit (EXIT_FAILURE); |
631 | } |
759 | } |
632 | } |
760 | } |
633 | |
761 | |
… | |
… | |
682 | { |
810 | { |
683 | slog (L_INFO, _("preparing shutdown...")); |
811 | slog (L_INFO, _("preparing shutdown...")); |
684 | |
812 | |
685 | shutdown_all (); |
813 | shutdown_all (); |
686 | remove_pid (conf.pidfilename); |
814 | remove_pid (conf.pidfilename); |
687 | slog (L_INFO, _("terminating")); |
815 | slog (L_INFO, _("exiting.")); |
688 | exit (EXIT_SUCCESS); |
816 | exit (EXIT_SUCCESS); |
689 | } |
817 | } |
690 | |
818 | |
691 | if (events & EVENT_RECONNECT) |
819 | if (events & EVENT_RECONNECT) |
692 | { |
820 | { |
693 | slog (L_INFO, _("forced reconnect")); |
821 | slog (L_INFO, _("forced reconnect.")); |
694 | |
822 | |
695 | reconnect_all (); |
823 | reconnect_all (); |
696 | } |
824 | } |
697 | |
825 | |
698 | events = 0; |
826 | events = 0; |
… | |
… | |
714 | |
842 | |
715 | conns.clear (); |
843 | conns.clear (); |
716 | |
844 | |
717 | connection_init (); |
845 | connection_init (); |
718 | |
846 | |
719 | for (configuration::node_vector::iterator i = conf.nodes.begin (); |
847 | for (configuration::node_vector::iterator i = conf.nodes.begin (); i != conf.nodes.end (); ++i) |
720 | i != conf.nodes.end (); ++i) |
848 | conns.push_back (new connection (this, *i)); |
721 | { |
849 | |
722 | connection *conn = new connection (this, *i); |
850 | for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c) |
723 | conns.push_back (conn); |
|
|
724 | conn->establish_connection (); |
851 | (*c)->establish_connection (); |
725 | } |
|
|
726 | } |
852 | } |
727 | |
853 | |
728 | connection *vpn::find_router () |
854 | bool |
|
|
855 | vpn::can_direct (conf_node *src, conf_node *dst) const |
729 | { |
856 | { |
730 | u32 prio = 1; |
857 | return src != dst |
|
|
858 | && src->may_direct (dst) |
|
|
859 | && dst->may_direct (src) |
|
|
860 | && (((src->protocols & dst->protocols) && src->connectmode == conf_node::C_ALWAYS) |
|
|
861 | || (src->protocols & dst->connectable_protocols ())); |
|
|
862 | } |
|
|
863 | |
|
|
864 | // only works for indirect and routed connections: find a router |
|
|
865 | // from THISNODE to dst |
|
|
866 | connection * |
|
|
867 | vpn::find_router_for (const connection *dst) |
|
|
868 | { |
731 | connection *router = 0; |
869 | connection *router = 0; |
732 | |
870 | |
|
|
871 | // first try to find a router with a direct connection, route there |
|
|
872 | // regardless of any other considerations. |
|
|
873 | { |
|
|
874 | u32 prio = 1; |
|
|
875 | |
|
|
876 | for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i) |
|
|
877 | { |
|
|
878 | connection *c = *i; |
|
|
879 | |
|
|
880 | if (c->conf->routerprio > prio |
|
|
881 | && c->conf != THISNODE |
|
|
882 | && can_direct (c->conf, dst->conf) |
|
|
883 | && c->ictx && c->octx) |
|
|
884 | { |
|
|
885 | prio = c->conf->routerprio; |
|
|
886 | router = c; |
|
|
887 | } |
|
|
888 | } |
|
|
889 | } |
|
|
890 | |
|
|
891 | if (router) |
|
|
892 | return router; |
|
|
893 | |
|
|
894 | // second try find the router with the highest priority, higher than ours |
|
|
895 | { |
|
|
896 | u32 prio = THISNODE->routerprio ? THISNODE->routerprio : 1; |
|
|
897 | |
|
|
898 | for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i) |
|
|
899 | { |
|
|
900 | connection *c = *i; |
|
|
901 | |
|
|
902 | if (c->conf->routerprio > prio |
|
|
903 | && c != dst |
|
|
904 | && c->conf != THISNODE |
|
|
905 | && c->ictx && c->octx) |
|
|
906 | { |
|
|
907 | prio = c->conf->routerprio; |
|
|
908 | router = c; |
|
|
909 | } |
|
|
910 | } |
|
|
911 | } |
|
|
912 | |
|
|
913 | return router; |
|
|
914 | } |
|
|
915 | |
|
|
916 | void |
|
|
917 | vpn::connection_established (connection *c) |
|
|
918 | { |
733 | for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i) |
919 | for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i) |
734 | { |
920 | { |
735 | connection *c = *i; |
921 | connection *o = *i; |
736 | |
922 | |
737 | if (c->conf->routerprio > prio |
923 | if (!o->is_direct |
738 | && c->connectmode == conf_node::C_ALWAYS // so we don't drop the connection if in use |
924 | && o->si.valid () |
739 | && c->ictx && c->octx |
925 | && c->si != o->si |
740 | && c->conf != THISNODE) // redundant, since ictx==octx==0 always on thisnode |
926 | && c == find_router_for (o)) |
741 | { |
|
|
742 | prio = c->conf->routerprio; |
|
|
743 | router = c; |
|
|
744 | } |
927 | { |
|
|
928 | slog (L_DEBUG, _("%s: can now route packets via %s, re-keying connection."), |
|
|
929 | o->conf->nodename, c->conf->nodename); |
|
|
930 | o->rekey (); |
|
|
931 | } |
745 | } |
932 | } |
746 | |
|
|
747 | return router; |
|
|
748 | } |
933 | } |
749 | |
934 | |
|
|
935 | void |
750 | void vpn::send_connect_request (int id) |
936 | vpn::send_connect_request (connection *c) |
751 | { |
937 | { |
752 | connection *c = find_router (); |
938 | connection *r = find_router_for (c); |
753 | |
939 | |
754 | if (c) |
940 | if (r) |
|
|
941 | { |
|
|
942 | slog (L_TRACE, _("%s: no address known, sending mediated connection request via %s."), |
|
|
943 | c->conf->nodename, r->conf->nodename); |
755 | c->send_connect_request (id); |
944 | r->send_connect_request (c->conf->id); |
|
|
945 | } |
756 | else |
946 | else |
757 | // no router found, aggressively connect to all routers |
947 | 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) |
948 | c->conf->nodename); |
759 | if ((*i)->conf->routerprio && (*i)->conf != THISNODE) |
|
|
760 | (*i)->establish_connection (); |
|
|
761 | } |
949 | } |
762 | |
950 | |
763 | void |
951 | void |
764 | connection::dump_status () |
952 | connection::dump_status () |
765 | { |
953 | { |
766 | slog (L_NOTICE, _("node %s (id %d)"), conf->nodename, conf->id); |
954 | slog (L_NOTICE, _("node %s (id %d)"), conf->nodename, conf->id); |
767 | slog (L_NOTICE, _(" connectmode %d (%d) / sockaddr %s / minor %d"), |
955 | slog (L_NOTICE, _(" connectmode %d (%d) / sockaddr %s / minor %d"), |
768 | connectmode, conf->connectmode, (const char *)si, (int)prot_minor); |
956 | connectmode, conf->connectmode, (const char *)si, (int)prot_minor); |
769 | slog (L_NOTICE, _(" ictx/octx %08lx/%08lx / oseqno %d / retry_cnt %d"), |
957 | slog (L_NOTICE, _(" ictx/octx %08lx/%08lx / oseqno %d / retry_cnt %d"), |
770 | (long)ictx, (long)octx, (int)oseqno, (int)retry_cnt); |
958 | (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)); |
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|
773 | } |
959 | } |
774 | |
960 | |
775 | void |
961 | void |
776 | vpn::dump_status () |
962 | vpn::dump_status () |
777 | { |
963 | { |
… | |
… | |
786 | vpn::vpn (void) |
972 | vpn::vpn (void) |
787 | { |
973 | { |
788 | event .set<vpn, &vpn::event_cb > (this); |
974 | event .set<vpn, &vpn::event_cb > (this); |
789 | udpv4_ev_watcher .set<vpn, &vpn::udpv4_ev > (this); |
975 | udpv4_ev_watcher .set<vpn, &vpn::udpv4_ev > (this); |
790 | ipv4_ev_watcher .set<vpn, &vpn::ipv4_ev > (this); |
976 | ipv4_ev_watcher .set<vpn, &vpn::ipv4_ev > (this); |
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|
977 | #if 1//D2 |
|
|
978 | ipv42_ev_watcher .set<vpn, &vpn::ipv42_ev > (this); |
|
|
979 | #endif |
791 | #if ENABLE_TCP |
980 | #if ENABLE_TCP |
792 | tcpv4_ev_watcher .set<vpn, &vpn::tcpv4_ev > (this); |
981 | tcpv4_ev_watcher .set<vpn, &vpn::tcpv4_ev > (this); |
793 | #endif |
982 | #endif |
794 | #if ENABLE_ICMP |
983 | #if ENABLE_ICMP |
795 | icmpv4_ev_watcher.set<vpn, &vpn::icmpv4_ev> (this); |
984 | icmpv4_ev_watcher.set<vpn, &vpn::icmpv4_ev> (this); |