1 | /* |
1 | /* |
2 | vpn.C -- handle the protocol, encryption, handshaking etc. |
2 | vpn.C -- handle the protocol, encryption, handshaking etc. |
3 | Copyright (C) 2003-2008 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 it |
7 | GVPE is free software; you can redistribute it and/or modify it |
8 | under the terms of the GNU General Public License as published by the |
8 | under the terms of the GNU General Public License as published by the |
… | |
… | |
38 | #include <cstdlib> |
38 | #include <cstdlib> |
39 | |
39 | |
40 | #include <sys/types.h> |
40 | #include <sys/types.h> |
41 | #include <sys/socket.h> |
41 | #include <sys/socket.h> |
42 | #include <sys/wait.h> |
42 | #include <sys/wait.h> |
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43 | #include <sys/stat.h> |
43 | #include <errno.h> |
44 | #include <errno.h> |
44 | #include <time.h> |
45 | #include <time.h> |
45 | #include <unistd.h> |
46 | #include <unistd.h> |
46 | #include <fcntl.h> |
47 | #include <fcntl.h> |
47 | #include <sys/socket.h> |
48 | #include <sys/socket.h> |
… | |
… | |
52 | |
53 | |
53 | #include "connection.h" |
54 | #include "connection.h" |
54 | #include "util.h" |
55 | #include "util.h" |
55 | #include "vpn.h" |
56 | #include "vpn.h" |
56 | |
57 | |
|
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58 | using namespace std; |
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59 | |
57 | vpn network; // THE vpn (bad design...) |
60 | vpn network; // THE vpn (bad design...) |
58 | |
61 | |
59 | ///////////////////////////////////////////////////////////////////////////// |
62 | ///////////////////////////////////////////////////////////////////////////// |
60 | |
63 | |
61 | static void inline |
64 | static void inline |
… | |
… | |
75 | { |
78 | { |
76 | // the tunnel device mtu should be the physical mtu - overhead |
79 | // the tunnel device mtu should be the physical mtu - overhead |
77 | // the tricky part is rounding to the cipher key blocksize |
80 | // the tricky part is rounding to the cipher key blocksize |
78 | int mtu = conf.mtu - ETH_OVERHEAD - VPE_OVERHEAD - MAX_OVERHEAD; |
81 | int mtu = conf.mtu - ETH_OVERHEAD - VPE_OVERHEAD - MAX_OVERHEAD; |
79 | mtu += ETH_OVERHEAD - 6 - 6; // now we have the data portion |
82 | mtu += ETH_OVERHEAD - 6 - 6; // now we have the data portion |
80 | mtu -= mtu % EVP_CIPHER_block_size (CIPHER); // round |
83 | mtu -= mtu % BLOCK_SIZE (CIPHER); // round |
81 | mtu -= ETH_OVERHEAD - 6 - 6; // and get interface mtu again |
84 | mtu -= ETH_OVERHEAD - 6 - 6; // and get interface mtu again |
82 | |
85 | |
83 | char *env; |
86 | char *env; |
84 | asprintf (&env, "CONFBASE=%s", confbase); putenv (env); |
87 | asprintf (&env, "CONFBASE=%s", confbase); putenv (env); |
85 | asprintf (&env, "IFNAME=%s", tap->interface ()); putenv (env); |
88 | asprintf (&env, "IFNAME=%s", tap->interface ()); putenv (env); |
… | |
… | |
110 | inline const char * |
113 | inline const char * |
111 | vpn::script_if_up () |
114 | vpn::script_if_up () |
112 | { |
115 | { |
113 | script_init_env (); |
116 | script_init_env (); |
114 | |
117 | |
115 | char *filename; |
118 | return conf.config_filename (::conf.script_if_up, "if-up"); |
116 | asprintf (&filename, |
119 | } |
117 | "%s/%s", |
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118 | confbase, |
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119 | ::conf.script_if_up ? ::conf.script_if_up : "if-up"); |
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120 | |
120 | |
121 | 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; |
122 | } |
142 | } |
123 | |
143 | |
124 | int |
144 | int |
125 | vpn::setup () |
145 | vpn::setup () |
126 | { |
146 | { |
… | |
… | |
129 | ipv4_tos = -1; |
149 | ipv4_tos = -1; |
130 | ipv4_fd = -1; |
150 | ipv4_fd = -1; |
131 | |
151 | |
132 | if (THISNODE->protocols & PROT_IPv4 && ::conf.ip_proto) |
152 | if (THISNODE->protocols & PROT_IPv4 && ::conf.ip_proto) |
133 | { |
153 | { |
134 | ipv4_fd = socket (PF_INET, SOCK_RAW, ::conf.ip_proto); |
154 | ipv4_fd = setup_socket (PROT_IPv4, PF_INET, SOCK_RAW, ::conf.ip_proto); |
135 | |
155 | |
136 | if (ipv4_fd < 0) |
156 | if (ipv4_fd < 0) |
137 | return -1; |
157 | return -1; |
138 | |
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139 | fcntl (ipv4_fd, F_SETFL, O_NONBLOCK); |
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140 | fcntl (ipv4_fd, F_SETFD, FD_CLOEXEC); |
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141 | |
158 | |
142 | #if defined(SOL_IP) && defined(IP_MTU_DISCOVER) |
159 | #if defined(SOL_IP) && defined(IP_MTU_DISCOVER) |
143 | // this I really consider a linux bug. I am neither connected |
160 | // this I really consider a linux bug. I am neither connected |
144 | // 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 |
145 | // fragment for me sometimes. |
162 | // fragment for me sometimes. |
… | |
… | |
152 | sockinfo si (THISNODE, PROT_IPv4); |
169 | sockinfo si (THISNODE, PROT_IPv4); |
153 | |
170 | |
154 | if (bind (ipv4_fd, si.sav4 (), si.salenv4 ())) |
171 | if (bind (ipv4_fd, si.sav4 (), si.salenv4 ())) |
155 | { |
172 | { |
156 | slog (L_ERR, _("can't bind ipv4 socket on %s: %s, exiting."), (const char *)si, strerror (errno)); |
173 | slog (L_ERR, _("can't bind ipv4 socket on %s: %s, exiting."), (const char *)si, strerror (errno)); |
157 | exit (EXIT_FAILURE); |
174 | return -1; |
158 | } |
175 | } |
159 | |
176 | |
160 | ipv4_ev_watcher.start (ipv4_fd, EV_READ); |
177 | ipv4_ev_watcher.start (ipv4_fd, EV_READ); |
161 | ++success; |
178 | ++success; |
162 | } |
179 | } |
… | |
… | |
166 | udpv4_tos = -1; |
183 | udpv4_tos = -1; |
167 | udpv4_fd = -1; |
184 | udpv4_fd = -1; |
168 | |
185 | |
169 | if (THISNODE->protocols & PROT_UDPv4 && THISNODE->udp_port) |
186 | if (THISNODE->protocols & PROT_UDPv4 && THISNODE->udp_port) |
170 | { |
187 | { |
171 | udpv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP); |
188 | udpv4_fd = setup_socket (PROT_UDPv4, PF_INET, SOCK_DGRAM, IPPROTO_UDP); |
172 | |
189 | |
173 | if (udpv4_fd < 0) |
190 | if (udpv4_fd < 0) |
174 | return -1; |
191 | return -1; |
175 | |
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176 | fcntl (udpv4_fd, F_SETFL, O_NONBLOCK); |
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177 | fcntl (udpv4_fd, F_SETFD, FD_CLOEXEC); |
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178 | |
192 | |
179 | // standard daemon practise... |
193 | // standard daemon practise... |
180 | { |
194 | { |
181 | int oval = 1; |
195 | int oval = 1; |
182 | setsockopt (udpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval); |
196 | setsockopt (udpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval); |
… | |
… | |
195 | sockinfo si (THISNODE, PROT_UDPv4); |
209 | sockinfo si (THISNODE, PROT_UDPv4); |
196 | |
210 | |
197 | if (bind (udpv4_fd, si.sav4 (), si.salenv4 ())) |
211 | if (bind (udpv4_fd, si.sav4 (), si.salenv4 ())) |
198 | { |
212 | { |
199 | slog (L_ERR, _("can't bind udpv4 on %s: %s, exiting."), (const char *)si, strerror (errno)); |
213 | slog (L_ERR, _("can't bind udpv4 on %s: %s, exiting."), (const char *)si, strerror (errno)); |
200 | exit (EXIT_FAILURE); |
214 | return -1; |
201 | } |
215 | } |
202 | |
216 | |
203 | udpv4_ev_watcher.start (udpv4_fd, EV_READ); |
217 | udpv4_ev_watcher.start (udpv4_fd, EV_READ); |
204 | ++success; |
218 | ++success; |
205 | } |
219 | } |
… | |
… | |
210 | icmpv4_fd = -1; |
224 | icmpv4_fd = -1; |
211 | |
225 | |
212 | #if ENABLE_ICMP |
226 | #if ENABLE_ICMP |
213 | if (THISNODE->protocols & PROT_ICMPv4) |
227 | if (THISNODE->protocols & PROT_ICMPv4) |
214 | { |
228 | { |
215 | icmpv4_fd = socket (PF_INET, SOCK_RAW, IPPROTO_ICMP); |
229 | icmpv4_fd = setup_socket (PROT_ICMPv4, PF_INET, SOCK_RAW, IPPROTO_ICMP); |
216 | |
230 | |
217 | if (icmpv4_fd < 0) |
231 | if (icmpv4_fd < 0) |
218 | return -1; |
232 | return -1; |
219 | |
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220 | fcntl (icmpv4_fd, F_SETFL, O_NONBLOCK); |
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221 | fcntl (icmpv4_fd, F_SETFD, FD_CLOEXEC); |
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222 | |
233 | |
223 | #ifdef ICMP_FILTER |
234 | #ifdef ICMP_FILTER |
224 | { |
235 | { |
225 | icmp_filter oval; |
236 | icmp_filter oval; |
226 | oval.data = 0xffffffff; |
237 | oval.data = 0xffffffff; |
… | |
… | |
244 | sockinfo si (THISNODE, PROT_ICMPv4); |
255 | sockinfo si (THISNODE, PROT_ICMPv4); |
245 | |
256 | |
246 | if (bind (icmpv4_fd, si.sav4 (), si.salenv4 ())) |
257 | if (bind (icmpv4_fd, si.sav4 (), si.salenv4 ())) |
247 | { |
258 | { |
248 | slog (L_ERR, _("can't bind icmpv4 on %s: %s, exiting."), (const char *)si, strerror (errno)); |
259 | slog (L_ERR, _("can't bind icmpv4 on %s: %s, exiting."), (const char *)si, strerror (errno)); |
249 | exit (EXIT_FAILURE); |
260 | return -1; |
250 | } |
261 | } |
251 | |
262 | |
252 | icmpv4_ev_watcher.start (icmpv4_fd, EV_READ); |
263 | icmpv4_ev_watcher.start (icmpv4_fd, EV_READ); |
253 | ++success; |
264 | ++success; |
254 | } |
265 | } |
… | |
… | |
257 | tcpv4_fd = -1; |
268 | tcpv4_fd = -1; |
258 | |
269 | |
259 | #if ENABLE_TCP |
270 | #if ENABLE_TCP |
260 | if (THISNODE->protocols & PROT_TCPv4 && THISNODE->tcp_port) |
271 | if (THISNODE->protocols & PROT_TCPv4 && THISNODE->tcp_port) |
261 | { |
272 | { |
262 | tcpv4_fd = socket (PF_INET, SOCK_STREAM, IPPROTO_TCP); |
273 | tcpv4_fd = setup_socket (PROT_TCPv4, PF_INET, SOCK_STREAM, IPPROTO_TCP); |
263 | |
274 | |
264 | if (tcpv4_fd < 0) |
275 | if (tcpv4_fd < 0) |
265 | return -1; |
276 | return -1; |
266 | |
277 | |
267 | fcntl (tcpv4_fd, F_SETFL, O_NONBLOCK); |
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268 | fcntl (tcpv4_fd, F_SETFD, FD_CLOEXEC); |
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269 | |
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270 | // standard daemon practise... |
278 | // standard daemon practise... |
271 | { |
279 | { |
272 | int oval = 1; |
280 | int oval = 1; |
273 | setsockopt (tcpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval); |
281 | setsockopt (tcpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval); |
274 | } |
282 | } |
… | |
… | |
276 | sockinfo si (THISNODE, PROT_TCPv4); |
284 | sockinfo si (THISNODE, PROT_TCPv4); |
277 | |
285 | |
278 | if (bind (tcpv4_fd, si.sav4 (), si.salenv4 ())) |
286 | if (bind (tcpv4_fd, si.sav4 (), si.salenv4 ())) |
279 | { |
287 | { |
280 | slog (L_ERR, _("can't bind tcpv4 on %s: %s, exiting."), (const char *)si, strerror (errno)); |
288 | slog (L_ERR, _("can't bind tcpv4 on %s: %s, exiting."), (const char *)si, strerror (errno)); |
281 | exit (EXIT_FAILURE); |
289 | return -1; |
282 | } |
290 | } |
283 | |
291 | |
284 | if (listen (tcpv4_fd, 5)) |
292 | if (listen (tcpv4_fd, 5)) |
285 | { |
293 | { |
286 | slog (L_ERR, _("can't listen tcpv4 on %s: %s, exiting."), (const char *)si, strerror (errno)); |
294 | slog (L_ERR, _("can't listen tcpv4 on %s: %s, exiting."), (const char *)si, strerror (errno)); |
287 | exit (EXIT_FAILURE); |
295 | return -1; |
288 | } |
296 | } |
289 | |
297 | |
290 | tcpv4_ev_watcher.start (tcpv4_fd, EV_READ); |
298 | tcpv4_ev_watcher.start (tcpv4_fd, EV_READ); |
291 | ++success; |
299 | ++success; |
292 | } |
300 | } |
… | |
… | |
300 | #if ENABLE_DNS |
308 | #if ENABLE_DNS |
301 | if (THISNODE->protocols & PROT_DNSv4) |
309 | if (THISNODE->protocols & PROT_DNSv4) |
302 | { |
310 | { |
303 | 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); |
304 | |
312 | |
305 | dnsv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP); |
313 | dnsv4_fd = setup_socket (PROT_DNSv4, PF_INET, SOCK_DGRAM, IPPROTO_UDP); |
306 | |
314 | |
307 | if (dnsv4_fd < 0) |
315 | if (dnsv4_fd < 0) |
308 | return -1; |
316 | return -1; |
309 | |
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310 | fcntl (dnsv4_fd, F_SETFL, O_NONBLOCK); |
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311 | fcntl (dnsv4_fd, F_SETFD, FD_CLOEXEC); |
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312 | |
317 | |
313 | # if defined(SOL_IP) && defined(IP_MTU_DISCOVER) |
318 | # if defined(SOL_IP) && defined(IP_MTU_DISCOVER) |
314 | // this I really consider a linux bug. I am neither connected |
319 | // this I really consider a linux bug. I am neither connected |
315 | // 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 |
316 | // fragment for me sometimes. |
321 | // fragment for me sometimes. |
… | |
… | |
331 | PROT_DNSv4); |
336 | PROT_DNSv4); |
332 | |
337 | |
333 | if (bind (dnsv4_fd, si.sav4 (), si.salenv4 ())) |
338 | if (bind (dnsv4_fd, si.sav4 (), si.salenv4 ())) |
334 | { |
339 | { |
335 | slog (L_ERR, _("can't bind dnsv4 on %s: %s, exiting."), (const char *)si, strerror (errno)); |
340 | slog (L_ERR, _("can't bind dnsv4 on %s: %s, exiting."), (const char *)si, strerror (errno)); |
336 | exit (EXIT_FAILURE); |
341 | return -1; |
337 | } |
342 | } |
338 | |
343 | |
339 | dnsv4_ev_watcher.start (dnsv4_fd, EV_READ); |
344 | dnsv4_ev_watcher.start (dnsv4_fd, EV_READ); |
340 | ++success; |
345 | ++success; |
341 | } |
346 | } |
… | |
… | |
343 | |
348 | |
344 | ///////////////////////////////////////////////////////////////////////////// |
349 | ///////////////////////////////////////////////////////////////////////////// |
345 | |
350 | |
346 | if (!success) |
351 | if (!success) |
347 | { |
352 | { |
348 | slog (L_ERR, _("no protocols enabled, exiting.")); |
353 | slog (L_ERR, _("no protocols enabled.")); |
349 | exit (EXIT_FAILURE); |
354 | return -1; |
350 | } |
355 | } |
351 | |
356 | |
352 | reconnect_all (); |
357 | reconnect_all (); |
353 | |
358 | |
354 | ///////////////////////////////////////////////////////////////////////////// |
359 | ///////////////////////////////////////////////////////////////////////////// |
355 | |
360 | |
356 | tap = new tap_device (); |
361 | tap = new tap_device (); |
357 | if (!tap) //D this, of course, never catches |
362 | if (!tap) //D this, of course, never catches |
358 | { |
363 | { |
359 | slog (L_ERR, _("cannot create network interface '%s', exiting."), conf.ifname); |
364 | slog (L_ERR, _("cannot create network interface '%s'."), conf.ifname); |
360 | exit (EXIT_FAILURE); |
365 | return -1; |
361 | } |
366 | } |
362 | |
367 | |
363 | fcntl (tap->fd, F_SETFD, FD_CLOEXEC); |
368 | fcntl (tap->fd, F_SETFD, FD_CLOEXEC); |
364 | |
369 | |
365 | run_script_cb cb; |
370 | run_script_cb cb; |
366 | cb.set<vpn, &vpn::script_if_init> (this); |
371 | cb.set<vpn, &vpn::script_if_init> (this); |
367 | |
372 | |
368 | if (tap->if_up () && |
373 | if (tap->if_up () && |
369 | !run_script (cb, true)) |
374 | !run_script (cb, true)) |
370 | { |
375 | { |
371 | slog (L_ERR, _("interface initialization command '%s' failed, exiting."), |
376 | slog (L_ERR, _("interface initialization command '%s' failed."), |
372 | tap->if_up ()); |
377 | tap->if_up ()); |
373 | exit (EXIT_FAILURE); |
378 | return -1; |
374 | } |
379 | } |
375 | |
380 | |
376 | cb.set<vpn, &vpn::script_if_up> (this); |
381 | cb.set<vpn, &vpn::script_if_up> (this); |
377 | if (!run_script (cb, true)) |
382 | if (!run_script (cb, true)) |
378 | { |
383 | { |
379 | slog (L_ERR, _("if-up command execution failed, exiting.")); |
384 | slog (L_ERR, _("if-up command execution failed.")); |
380 | exit (EXIT_FAILURE); |
385 | return -1; |
381 | } |
386 | } |
382 | |
387 | |
383 | tap_ev_watcher.start (tap->fd, EV_READ); |
388 | tap_ev_watcher.start (tap->fd, EV_READ); |
384 | |
389 | |
385 | 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 | { |
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403 | slog (L_CRIT, _("unable to create anonymous root path.")); |
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404 | return false; |
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405 | } |
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406 | |
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407 | if (mkdir (dir, 0700)) |
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408 | { |
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409 | slog (L_CRIT, _("unable to create anonymous root directory.")); |
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410 | return false; |
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411 | } |
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412 | |
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413 | if (chdir (dir)) |
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414 | { |
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415 | slog (L_CRIT, _("unable to change to anonymous root directory.")); |
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416 | return false; |
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417 | } |
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418 | |
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419 | if (rmdir (dir)) |
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420 | slog (L_ERR, _("unable to remove anonymous root directory, continuing.")); |
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421 | } |
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422 | else |
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423 | { |
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424 | if (chdir (::conf.change_root)) |
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425 | { |
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426 | slog (L_CRIT, _("%s: unable to change to specified root directory."), ::conf.change_root); |
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427 | return false; |
|
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428 | } |
|
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429 | } |
|
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430 | |
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431 | if (chroot (".")) |
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432 | { |
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433 | slog (L_CRIT, _("unable to set new root directory.")); |
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434 | return false; |
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435 | } |
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436 | |
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437 | if (chdir ("/")) |
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438 | { |
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439 | slog (L_CRIT, _("unable to set cwd to new root directory.")); |
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440 | return false; |
|
|
441 | } |
|
|
442 | } |
|
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443 | |
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444 | if (::conf.change_gid) |
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445 | if (setgid (::conf.change_gid)) |
|
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446 | { |
|
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447 | slog (L_CRIT, _("unable to change group id to %d."), ::conf.change_gid); |
|
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448 | return false; |
|
|
449 | } |
|
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450 | |
|
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451 | if (::conf.change_uid) |
|
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452 | if (setuid (::conf.change_uid)) |
|
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453 | { |
|
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454 | slog (L_CRIT, _("unable to change user id to %d."), ::conf.change_uid); |
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455 | return false; |
|
|
456 | } |
|
|
457 | |
|
|
458 | return true; |
386 | } |
459 | } |
387 | |
460 | |
388 | bool |
461 | bool |
389 | 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) |
390 | { |
463 | { |
… | |
… | |
474 | (const char *)rsi, pkt->typ (), pkt->src (), pkt->dst (), pkt->len); |
547 | (const char *)rsi, pkt->typ (), pkt->src (), pkt->dst (), pkt->len); |
475 | |
548 | |
476 | if (src == 0 || src > conns.size () |
549 | if (src == 0 || src > conns.size () |
477 | || dst > conns.size () |
550 | || dst > conns.size () |
478 | || pkt->typ () >= vpn_packet::PT_MAX) |
551 | || pkt->typ () >= vpn_packet::PT_MAX) |
479 | slog (L_WARN, _("(%s): received corrupted packet type %d (src %d, dst %d)."), |
|
|
480 | (const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ()); |
|
|
481 | else if (dst > conns.size ()) |
|
|
482 | 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)."), |
483 | (const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ()); |
553 | (const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ()); |
484 | else |
554 | else |
485 | { |
555 | { |
486 | connection *c = conns[src - 1]; |
556 | connection *c = conns[src - 1]; |
… | |
… | |
508 | 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) |
509 | { |
579 | { |
510 | switch (si.prot) |
580 | switch (si.prot) |
511 | { |
581 | { |
512 | case PROT_IPv4: |
582 | case PROT_IPv4: |
513 | return send_ipv4_packet (pkt, si, tos); |
583 | return send_ipv4_packet (pkt, si, tos); |
514 | |
584 | |
515 | case PROT_UDPv4: |
585 | case PROT_UDPv4: |
516 | return send_udpv4_packet (pkt, si, tos); |
586 | return send_udpv4_packet (pkt, si, tos); |
517 | |
587 | |
518 | #if ENABLE_TCP |
588 | #if ENABLE_TCP |
519 | case PROT_TCPv4: |
589 | case PROT_TCPv4: |
520 | return send_tcpv4_packet (pkt, si, tos); |
590 | return send_tcpv4_packet (pkt, si, tos); |
521 | #endif |
591 | #endif |
522 | #if ENABLE_ICMP |
592 | #if ENABLE_ICMP |
523 | case PROT_ICMPv4: |
593 | case PROT_ICMPv4: |
524 | return send_icmpv4_packet (pkt, si, tos); |
594 | return send_icmpv4_packet (pkt, si, tos); |
525 | #endif |
595 | #endif |
526 | #if ENABLE_DNS |
596 | #if ENABLE_DNS |
527 | case PROT_DNSv4: |
597 | case PROT_DNSv4: |
528 | return send_dnsv4_packet (pkt, si, tos); |
598 | return send_dnsv4_packet (pkt, si, tos); |
529 | #endif |
599 | #endif |
530 | default: |
600 | default: |
531 | 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); |
532 | } |
602 | } |
533 | |
603 | |
… | |
… | |
551 | if (len > 0) |
621 | if (len > 0) |
552 | { |
622 | { |
553 | pkt->len = len; |
623 | pkt->len = len; |
554 | |
624 | |
555 | // 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 |
556 | pkt->skip_hdr (IP_OVERHEAD); |
626 | pkt->skip_hdr (pkt->ipv4_hdr_len ()); |
557 | |
627 | |
558 | recv_vpn_packet (pkt, si); |
628 | recv_vpn_packet (pkt, si); |
559 | } |
629 | } |
560 | else |
630 | else |
561 | { |
631 | { |
… | |
… | |
598 | if (hdr->type == ::conf.icmp_type |
668 | if (hdr->type == ::conf.icmp_type |
599 | && hdr->code == 255) |
669 | && hdr->code == 255) |
600 | { |
670 | { |
601 | // 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 |
602 | // this is slow, but... |
672 | // this is slow, but... |
603 | pkt->skip_hdr (ICMP_OVERHEAD); |
673 | pkt->skip_hdr (pkt->ipv4_hdr_len () + (ICMP_OVERHEAD - IP_OVERHEAD)); |
604 | |
674 | |
605 | recv_vpn_packet (pkt, si); |
675 | recv_vpn_packet (pkt, si); |
606 | } |
676 | } |
607 | } |
677 | } |
608 | else |
678 | else |
… | |
… | |
750 | |
820 | |
751 | for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c) |
821 | for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c) |
752 | (*c)->establish_connection (); |
822 | (*c)->establish_connection (); |
753 | } |
823 | } |
754 | |
824 | |
|
|
825 | bool |
755 | bool vpn::can_direct (conf_node *src, conf_node *dst) const |
826 | vpn::can_direct (conf_node *src, conf_node *dst) const |
756 | { |
827 | { |
757 | return src != dst |
828 | return src != dst |
758 | && src->may_direct (dst) |
829 | && src->may_direct (dst) |
759 | && dst->may_direct (src) |
830 | && dst->may_direct (src) |
760 | && (((src->protocols & dst->protocols) && src->connectmode == conf_node::C_ALWAYS) |
831 | && (((src->protocols & dst->protocols) && src->connectmode == conf_node::C_ALWAYS) |
761 | || (src->protocols & dst->connectable_protocols ())); |
832 | || (src->protocols & dst->connectable_protocols ())); |
762 | } |
833 | } |
763 | |
834 | |
764 | // only works for indirect and routed connections: find a router |
835 | // only works for indirect and routed connections: find a router |
765 | // from THISNODE to dst |
836 | // from THISNODE to dst |
|
|
837 | connection * |
766 | connection *vpn::find_router_for (const connection *dst) |
838 | vpn::find_router_for (const connection *dst) |
767 | { |
839 | { |
768 | connection *router = 0; |
840 | connection *router = 0; |
769 | |
841 | |
770 | // first try to find a router with a direct connection, route there |
842 | // first try to find a router with a direct connection, route there |
771 | // regardless of any other considerations. |
843 | // regardless of any other considerations. |
… | |
… | |
810 | } |
882 | } |
811 | |
883 | |
812 | return router; |
884 | return router; |
813 | } |
885 | } |
814 | |
886 | |
|
|
887 | void |
815 | void vpn::connection_established (connection *c) |
888 | vpn::connection_established (connection *c) |
816 | { |
889 | { |
817 | for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i) |
890 | for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i) |
818 | { |
891 | { |
819 | connection *o = *i; |
892 | connection *o = *i; |
820 | |
893 | |
821 | if (!o->is_direct |
|
|
822 | && o->si.valid () |
894 | if (o->si.valid () |
823 | && c->si != o->si |
895 | && c->si != o->si |
824 | && c == find_router_for (o)) |
896 | && c == find_router_for (o) |
|
|
897 | && !can_direct (THISNODE, o->conf)) |
825 | { |
898 | { |
826 | slog (L_DEBUG, _("%s: can now route packets via %s, re-keying connection."), |
899 | slog (L_DEBUG, _("%s: can now route packets via %s, re-keying connection."), |
827 | o->conf->nodename, c->conf->nodename); |
900 | o->conf->nodename, c->conf->nodename); |
828 | o->rekey (); |
901 | o->rekey (); |
829 | } |
902 | } |
830 | } |
903 | } |
831 | } |
904 | } |
832 | |
905 | |
|
|
906 | void |
833 | void vpn::send_connect_request (connection *c) |
907 | vpn::send_connect_request (connection *c) |
834 | { |
908 | { |
835 | connection *r = find_router_for (c); |
909 | connection *r = find_router_for (c); |
836 | |
910 | |
837 | if (r) |
911 | if (r) |
838 | { |
912 | { |
839 | slog (L_TRACE, _("%s: no way to connect, sending mediated connection request via %s."), |
913 | slog (L_TRACE, _("%s: no address known, sending mediated connection request via %s."), |
840 | c->conf->nodename, r->conf->nodename); |
914 | c->conf->nodename, r->conf->nodename); |
841 | r->send_connect_request (c->conf->id); |
915 | r->send_connect_request (c->conf->id); |
842 | } |
916 | } |
843 | else |
917 | else |
844 | slog (L_DEBUG, _("%s: no way to connect and no router found: unable to connect."), |
918 | slog (L_DEBUG, _("%s: no way to connect and no router found: unable to connect at this time."), |
845 | c->conf->nodename); |
919 | c->conf->nodename); |
846 | } |
920 | } |
847 | |
921 | |
848 | void |
922 | void |
849 | connection::dump_status () |
923 | connection::dump_status () |