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Comparing gvpe/src/vpn.C (file contents):
Revision 1.28 by pcg, Thu Mar 3 16:54:34 2005 UTC vs.
Revision 1.54 by pcg, Mon Mar 23 15:22:00 2009 UTC

1/* 1/*
2 vpn.C -- handle the protocol, encryption, handshaking etc. 2 vpn.C -- handle the protocol, encryption, handshaking etc.
3 Copyright (C) 2003-2005 Marc Lehmann <gvpe@schmorp.de> 3 Copyright (C) 2003-2008 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. 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 19
20 Additional permission under GNU GPL version 3 section 7
21
22 If you modify this Program, or any covered work, by linking or
23 combining it with the OpenSSL project's OpenSSL library (or a modified
24 version of that library), containing parts covered by the terms of the
25 OpenSSL or SSLeay licenses, the licensors of this Program grant you
26 additional permission to convey the resulting work. Corresponding
27 Source for a non-source form of such a combination shall include the
28 source code for the parts of OpenSSL used as well as that of the
29 covered work.
20*/ 30*/
21 31
22#include "config.h" 32#include "config.h"
23 33
24#include <list> 34#include <list>
… …
46 56
47vpn network; // THE vpn (bad design...) 57vpn network; // THE vpn (bad design...)
48 58
49///////////////////////////////////////////////////////////////////////////// 59/////////////////////////////////////////////////////////////////////////////
50 60
51const char *vpn::script_if_up () 61static void inline
62set_tos (int fd, int &tos_prev, int tos)
63{
64#if defined(SOL_IP) && defined(IP_TOS)
65 if (tos_prev == tos)
66 return;
67
68 tos_prev = tos;
69 setsockopt (fd, SOL_IP, IP_TOS, &tos, sizeof tos);
70#endif
71}
72
73void
74vpn::script_init_env ()
52{ 75{
53 // the tunnel device mtu should be the physical mtu - overhead 76 // the tunnel device mtu should be the physical mtu - overhead
54 // the tricky part is rounding to the cipher key blocksize 77 // the tricky part is rounding to the cipher key blocksize
55 int mtu = conf.mtu - ETH_OVERHEAD - VPE_OVERHEAD - MAX_OVERHEAD; 78 int mtu = conf.mtu - ETH_OVERHEAD - VPE_OVERHEAD - MAX_OVERHEAD;
56 mtu += ETH_OVERHEAD - 6 - 6; // now we have the data portion 79 mtu += ETH_OVERHEAD - 6 - 6; // now we have the data portion
57 mtu -= mtu % EVP_CIPHER_block_size (CIPHER); // round 80 mtu -= mtu % EVP_CIPHER_block_size (CIPHER); // round
58 mtu -= ETH_OVERHEAD - 6 - 6; // and get interface mtu again 81 mtu -= ETH_OVERHEAD - 6 - 6; // and get interface mtu again
59 82
60 char *env; 83 char *env;
61 asprintf (&env, "CONFBASE=%s", confbase); putenv (env); 84 asprintf (&env, "CONFBASE=%s", confbase); putenv (env);
62 asprintf (&env, "NODENAME=%s", THISNODE->nodename); putenv (env);
63 asprintf (&env, "NODEID=%d", THISNODE->id); putenv (env);
64 asprintf (&env, "IFNAME=%s", tap->interface ()); putenv (env); 85 asprintf (&env, "IFNAME=%s", tap->interface ()); putenv (env);
65 asprintf (&env, "IFTYPE=%s", IFTYPE); putenv (env); 86 asprintf (&env, "IFTYPE=%s", IFTYPE); putenv (env);
66 asprintf (&env, "IFSUBTYPE=%s", IFSUBTYPE); putenv (env); 87 asprintf (&env, "IFSUBTYPE=%s", IFSUBTYPE); putenv (env);
67 asprintf (&env, "MTU=%d", mtu); putenv (env); 88 asprintf (&env, "MTU=%d", mtu); putenv (env);
68 asprintf (&env, "MAC=%02x:%02x:%02x:%02x:%02x:%02x", 89 asprintf (&env, "NODES=%d", conns.size ()); putenv (env);
69 0xfe, 0xfd, 0x80, 0x00, THISNODE->id >> 8, 90 asprintf (&env, "NODEID=%d", THISNODE->id); putenv (env);
70 THISNODE->id & 0xff);
71 putenv (env);
72 91
92 conns [THISNODE->id - 1]->script_init_env ("");
93
94 for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)
95 {
96 char ext[16];
97 snprintf (ext, 16, "_%d", (*c)->conf->id);
98 (*c)->script_init_env (ext);
99 }
100}
101
102inline const char *
103vpn::script_if_init ()
104{
105 script_init_env ();
106
107 return tap->if_up ();
108}
109
110inline const char *
111vpn::script_if_up ()
112{
113 script_init_env ();
114
115 char *filename;
116 asprintf (&filename,
117 "%s/%s",
118 confbase,
73 return ::conf.script_if_up ? ::conf.script_if_up : "if-up"; 119 ::conf.script_if_up ? ::conf.script_if_up : "if-up");
120
121 return filename;
122}
123
124int
125vpn::setup_socket (u8 prot, int family, int type, int proto)
126{
127 int fd = socket (family, type, proto);
128
129 if (fd < 0)
130 {
131 slog (L_ERR, _("unable to create %s socket: %s."), strprotocol (prot), strerror (errno));
132 return fd;
133 }
134
135 fcntl (fd, F_SETFL, O_NONBLOCK);
136 fcntl (fd, F_SETFD, FD_CLOEXEC);
137
138#ifdef SO_MARK
139 if (::conf.nfmark)
140 setsockopt (ipv4_fd, SOL_SOCKET, SO_MARK, &::conf.nfmark, sizeof ::conf.nfmark);
141#endif
142
143 return fd;
74} 144}
75 145
76int 146int
77vpn::setup () 147vpn::setup ()
78{ 148{
149 int success = 0;
150
151 ipv4_tos = -1;
79 ipv4_fd = -1; 152 ipv4_fd = -1;
80 153
81 if (THISNODE->protocols & PROT_IPv4 && ::conf.ip_proto) 154 if (THISNODE->protocols & PROT_IPv4 && ::conf.ip_proto)
82 { 155 {
83 ipv4_fd = socket (PF_INET, SOCK_RAW, ::conf.ip_proto); 156 ipv4_fd = setup_socket (PROT_IPv4, PF_INET, SOCK_RAW, ::conf.ip_proto);
84 157
85 if (ipv4_fd < 0) 158 if (ipv4_fd < 0)
86 return -1; 159 return -1;
87
88 fcntl (ipv4_fd, F_SETFL, O_NONBLOCK);
89 160
90#if defined(SOL_IP) && defined(IP_MTU_DISCOVER) 161#if defined(SOL_IP) && defined(IP_MTU_DISCOVER)
91 // this I really consider a linux bug. I am neither connected 162 // this I really consider a linux bug. I am neither connected
92 // nor do I fragment myself. Linux still sets DF and doesn't 163 // nor do I fragment myself. Linux still sets DF and doesn't
93 // fragment for me sometimes. 164 // fragment for me sometimes.
… …
99 170
100 sockinfo si (THISNODE, PROT_IPv4); 171 sockinfo si (THISNODE, PROT_IPv4);
101 172
102 if (bind (ipv4_fd, si.sav4 (), si.salenv4 ())) 173 if (bind (ipv4_fd, si.sav4 (), si.salenv4 ()))
103 { 174 {
104 slog (L_ERR, _("can't bind ipv4 socket on %s: %s"), (const char *)si, strerror (errno)); 175 slog (L_ERR, _("can't bind ipv4 socket on %s: %s, exiting."), (const char *)si, strerror (errno));
105 exit (EXIT_FAILURE); 176 return -1;
106 } 177 }
107 178
108 ipv4_ev_watcher.start (ipv4_fd, EVENT_READ); 179 ipv4_ev_watcher.start (ipv4_fd, EV_READ);
180 ++success;
109 } 181 }
182 else
183 THISNODE->protocols &= ~PROT_IPv4;
110 184
185 udpv4_tos = -1;
111 udpv4_fd = -1; 186 udpv4_fd = -1;
112 187
113 if (THISNODE->protocols & PROT_UDPv4 && THISNODE->udp_port) 188 if (THISNODE->protocols & PROT_UDPv4 && THISNODE->udp_port)
114 { 189 {
115 udpv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP); 190 udpv4_fd = setup_socket (PROT_UDPv4, PF_INET, SOCK_DGRAM, IPPROTO_UDP);
116 191
117 if (udpv4_fd < 0) 192 if (udpv4_fd < 0)
118 return -1; 193 return -1;
119
120 fcntl (udpv4_fd, F_SETFL, O_NONBLOCK);
121 194
122 // standard daemon practise... 195 // standard daemon practise...
123 { 196 {
124 int oval = 1; 197 int oval = 1;
125 setsockopt (udpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval); 198 setsockopt (udpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);
… …
137 210
138 sockinfo si (THISNODE, PROT_UDPv4); 211 sockinfo si (THISNODE, PROT_UDPv4);
139 212
140 if (bind (udpv4_fd, si.sav4 (), si.salenv4 ())) 213 if (bind (udpv4_fd, si.sav4 (), si.salenv4 ()))
141 { 214 {
142 slog (L_ERR, _("can't bind udpv4 on %s: %s"), (const char *)si, strerror (errno)); 215 slog (L_ERR, _("can't bind udpv4 on %s: %s, exiting."), (const char *)si, strerror (errno));
143 exit (EXIT_FAILURE); 216 return -1;
144 } 217 }
145 218
146 udpv4_ev_watcher.start (udpv4_fd, EVENT_READ); 219 udpv4_ev_watcher.start (udpv4_fd, EV_READ);
220 ++success;
147 } 221 }
222 else
223 THISNODE->protocols &= ~PROT_UDPv4;
148 224
225 icmpv4_tos = -1;
149 icmpv4_fd = -1; 226 icmpv4_fd = -1;
150 227
151#if ENABLE_ICMP 228#if ENABLE_ICMP
152 if (THISNODE->protocols & PROT_ICMPv4) 229 if (THISNODE->protocols & PROT_ICMPv4)
153 { 230 {
154 icmpv4_fd = socket (PF_INET, SOCK_RAW, IPPROTO_ICMP); 231 icmpv4_fd = setup_socket (PROT_ICMPv4, PF_INET, SOCK_RAW, IPPROTO_ICMP);
155 232
156 if (icmpv4_fd < 0) 233 if (icmpv4_fd < 0)
157 return -1; 234 return -1;
158
159 fcntl (icmpv4_fd, F_SETFL, O_NONBLOCK);
160 235
161#ifdef ICMP_FILTER 236#ifdef ICMP_FILTER
162 { 237 {
163 icmp_filter oval; 238 icmp_filter oval;
164 oval.data = 0xffffffff; 239 oval.data = 0xffffffff;
… …
173 // this I really consider a linux bug. I am neither connected 248 // this I really consider a linux bug. I am neither connected
174 // nor do I fragment myself. Linux still sets DF and doesn't 249 // nor do I fragment myself. Linux still sets DF and doesn't
175 // fragment for me sometimes. 250 // fragment for me sometimes.
176 { 251 {
177 int oval = IP_PMTUDISC_DONT; 252 int oval = IP_PMTUDISC_DONT;
178 setsockopt (udpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval); 253 setsockopt (icmpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);
179 } 254 }
180#endif 255#endif
181 256
182 sockinfo si (THISNODE, PROT_ICMPv4); 257 sockinfo si (THISNODE, PROT_ICMPv4);
183 258
184 if (bind (icmpv4_fd, si.sav4 (), si.salenv4 ())) 259 if (bind (icmpv4_fd, si.sav4 (), si.salenv4 ()))
185 { 260 {
186 slog (L_ERR, _("can't bind icmpv4 on %s: %s"), (const char *)si, strerror (errno)); 261 slog (L_ERR, _("can't bind icmpv4 on %s: %s, exiting."), (const char *)si, strerror (errno));
187 exit (EXIT_FAILURE); 262 return -1;
188 } 263 }
189 264
190 icmpv4_ev_watcher.start (icmpv4_fd, EVENT_READ); 265 icmpv4_ev_watcher.start (icmpv4_fd, EV_READ);
266 ++success;
191 } 267 }
192#endif 268#endif
193 269
194 tcpv4_fd = -1; 270 tcpv4_fd = -1;
195 271
196#if ENABLE_TCP 272#if ENABLE_TCP
197 if (THISNODE->protocols & PROT_TCPv4 && THISNODE->tcp_port) 273 if (THISNODE->protocols & PROT_TCPv4 && THISNODE->tcp_port)
198 { 274 {
199 tcpv4_fd = socket (PF_INET, SOCK_STREAM, IPPROTO_TCP); 275 tcpv4_fd = setup_socket (PROT_TCPv4, PF_INET, SOCK_STREAM, IPPROTO_TCP);
200 276
201 if (tcpv4_fd < 0) 277 if (tcpv4_fd < 0)
202 return -1; 278 return -1;
203 279
204 fcntl (tcpv4_fd, F_SETFL, O_NONBLOCK);
205
206 // standard daemon practise... 280 // standard daemon practise...
207 { 281 {
208 int oval = 1; 282 int oval = 1;
209 setsockopt (tcpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval); 283 setsockopt (tcpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);
210 } 284 }
211 285
212 sockinfo si (THISNODE, PROT_TCPv4); 286 sockinfo si (THISNODE, PROT_TCPv4);
213 287
214 if (bind (tcpv4_fd, si.sav4 (), si.salenv4 ())) 288 if (bind (tcpv4_fd, si.sav4 (), si.salenv4 ()))
215 { 289 {
216 slog (L_ERR, _("can't bind tcpv4 on %s: %s"), (const char *)si, strerror (errno)); 290 slog (L_ERR, _("can't bind tcpv4 on %s: %s, exiting."), (const char *)si, strerror (errno));
217 exit (EXIT_FAILURE); 291 return -1;
218 } 292 }
219 293
220 if (listen (tcpv4_fd, 5)) 294 if (listen (tcpv4_fd, 5))
221 { 295 {
222 slog (L_ERR, _("can't listen tcpv4 on %s: %s"), (const char *)si, strerror (errno)); 296 slog (L_ERR, _("can't listen tcpv4 on %s: %s, exiting."), (const char *)si, strerror (errno));
223 exit (EXIT_FAILURE); 297 return -1;
224 } 298 }
225 299
226 tcpv4_ev_watcher.start (tcpv4_fd, EVENT_READ); 300 tcpv4_ev_watcher.start (tcpv4_fd, EV_READ);
301 ++success;
227 } 302 }
303 else
304 THISNODE->protocols &= ~PROT_TCPv4;
228#endif 305#endif
306
307 dnsv4_tos = -1;
308 dnsv4_fd = -1;
229 309
230#if ENABLE_DNS 310#if ENABLE_DNS
231 if (THISNODE->protocols & PROT_DNSv4) 311 if (THISNODE->protocols & PROT_DNSv4)
232 { 312 {
313 dns_forwarder.set (::conf.dns_forw_host, ::conf.dns_forw_port, PROT_DNSv4);
314
233 dnsv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP); 315 dnsv4_fd = setup_socket (PROT_DNSv4, PF_INET, SOCK_DGRAM, IPPROTO_UDP);
234 316
235 if (dnsv4_fd < 0) 317 if (dnsv4_fd < 0)
236 return -1; 318 return -1;
237 319
320# if defined(SOL_IP) && defined(IP_MTU_DISCOVER)
321 // this I really consider a linux bug. I am neither connected
322 // nor do I fragment myself. Linux still sets DF and doesn't
323 // fragment for me sometimes.
324 {
325 int oval = IP_PMTUDISC_DONT;
326 setsockopt (dnsv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);
327 }
328# endif
329
238 // standard daemon practise... 330 // standard daemon practise...
239 { 331 {
240 int oval = 1; 332 int oval = 1;
241 setsockopt (tcpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval); 333 setsockopt (dnsv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);
242 } 334 }
243 335
244 sockinfo si (THISNODE, PROT_DNSv4); 336 sockinfo si (THISNODE->dns_hostname,
337 THISNODE->dns_hostname ? THISNODE->dns_port : 0,
338 PROT_DNSv4);
245 339
246 if (bind (dnsv4_fd, si.sav4 (), si.salenv4 ())) 340 if (bind (dnsv4_fd, si.sav4 (), si.salenv4 ()))
247 { 341 {
248 slog (L_ERR, _("can't bind dnsv4 on %s: %s"), (const char *)si, strerror (errno)); 342 slog (L_ERR, _("can't bind dnsv4 on %s: %s, exiting."), (const char *)si, strerror (errno));
249 exit (EXIT_FAILURE); 343 return -1;
250 } 344 }
251 345
252 dnsv4_ev_watcher.start (dnsv4_fd, EVENT_READ); 346 dnsv4_ev_watcher.start (dnsv4_fd, EV_READ);
347 ++success;
348 }
349#endif
350
351 /////////////////////////////////////////////////////////////////////////////
352
353 if (!success)
253 } 354 {
254#endif 355 slog (L_ERR, _("no protocols enabled."));
356 return -1;
357 }
358
359 reconnect_all ();
360
361 /////////////////////////////////////////////////////////////////////////////
255 362
256 tap = new tap_device (); 363 tap = new tap_device ();
257 if (!tap) //D this, of course, never catches 364 if (!tap) //D this, of course, never catches
258 { 365 {
259 slog (L_ERR, _("cannot create network interface '%s'"), conf.ifname); 366 slog (L_ERR, _("cannot create network interface '%s'."), conf.ifname);
260 exit (EXIT_FAILURE); 367 return -1;
261 } 368 }
262 369
263 run_script (run_script_cb (this, &vpn::script_if_up), true); 370 fcntl (tap->fd, F_SETFD, FD_CLOEXEC);
264 371
372 run_script_cb cb;
373 cb.set<vpn, &vpn::script_if_init> (this);
374
375 if (tap->if_up () &&
376 !run_script (cb, true))
377 {
378 slog (L_ERR, _("interface initialization command '%s' failed."),
379 tap->if_up ());
380 return -1;
381 }
382
383 cb.set<vpn, &vpn::script_if_up> (this);
384 if (!run_script (cb, true))
385 {
386 slog (L_ERR, _("if-up command execution failed."));
387 return -1;
388 }
389
265 tap_ev_watcher.start (tap->fd, EVENT_READ); 390 tap_ev_watcher.start (tap->fd, EV_READ);
266
267 reconnect_all ();
268 391
269 return 0; 392 return 0;
270} 393}
271 394
272bool 395bool
273vpn::send_ipv4_packet (vpn_packet *pkt, const sockinfo &si, int tos) 396vpn::send_ipv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)
274{ 397{
275#if defined(SOL_IP) && defined(IP_TOS) 398 set_tos (ipv4_fd, ipv4_tos, tos);
276 setsockopt (ipv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);
277#endif
278 sendto (ipv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ()); 399 sendto (ipv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());
279 400
280 return true; 401 return true;
281} 402}
282 403
… …
305 426
306#if ENABLE_ICMP 427#if ENABLE_ICMP
307bool 428bool
308vpn::send_icmpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos) 429vpn::send_icmpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)
309{ 430{
310#if defined(SOL_IP) && defined(IP_TOS)
311 setsockopt (icmpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);
312#endif
313
314 pkt->unshift_hdr (4); 431 pkt->unshift_hdr (4);
315 432
316 icmp_header *hdr = (icmp_header *)&((*pkt)[0]); 433 icmp_header *hdr = (icmp_header *)&((*pkt)[0]);
317 hdr->type = ::conf.icmp_type; 434 hdr->type = ::conf.icmp_type;
318 hdr->code = 255; 435 hdr->code = 255;
319 hdr->checksum = 0; 436 hdr->checksum = 0;
320 hdr->checksum = ipv4_checksum ((u16 *)hdr, pkt->len); 437 hdr->checksum = ipv4_checksum ((u16 *)hdr, pkt->len);
321 438
439 set_tos (icmpv4_fd, icmpv4_tos, tos);
322 sendto (icmpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ()); 440 sendto (icmpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());
323 441
324 return true; 442 return true;
325} 443}
326#endif 444#endif
327 445
328bool 446bool
329vpn::send_udpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos) 447vpn::send_udpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)
330{ 448{
331#if defined(SOL_IP) && defined(IP_TOS) 449 set_tos (udpv4_fd, udpv4_tos, tos);
332 setsockopt (udpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);
333#endif
334 sendto (udpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ()); 450 sendto (udpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());
335 451
336 return true; 452 return true;
337} 453}
338 454
… …
349 { 465 {
350 // broadcast, this is ugly, but due to the security policy 466 // broadcast, this is ugly, but due to the security policy
351 // we have to connect to all hosts... 467 // we have to connect to all hosts...
352 for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c) 468 for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)
353 if ((*c)->conf != THISNODE) 469 if ((*c)->conf != THISNODE)
354 (*c)->inject_data_packet (pkt, true); 470 (*c)->inject_data_packet (pkt);
355 } 471 }
356} 472}
357 473
358void 474void
359vpn::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi) 475vpn::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)
360{ 476{
361 unsigned int src = pkt->src (); 477 unsigned int src = pkt->src ();
362 unsigned int dst = pkt->dst (); 478 unsigned int dst = pkt->dst ();
363 479
364 slog (L_NOISE, _("<<?/%s received possible vpn packet type %d from %d to %d, length %d"), 480 slog (L_NOISE, _("<<?/%s received possible vpn packet type %d from %d to %d, length %d."),
365 (const char *)rsi, pkt->typ (), pkt->src (), pkt->dst (), pkt->len); 481 (const char *)rsi, pkt->typ (), pkt->src (), pkt->dst (), pkt->len);
366 482
367 if (src == 0 || src > conns.size () 483 if (src == 0 || src > conns.size ()
368 || dst > conns.size () 484 || dst > conns.size ()
369 || pkt->typ () >= vpn_packet::PT_MAX) 485 || pkt->typ () >= vpn_packet::PT_MAX)
370 slog (L_WARN, _("(%s): received corrupted packet type %d (src %d, dst %d)"), 486 slog (L_WARN, _("(%s): received corrupted packet type %d (src %d, dst %d)."),
371 (const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ()); 487 (const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ());
372 else if (dst > conns.size ()) 488 else if (dst > conns.size ())
373 slog (L_WARN, _("(%s): received corrupted packet type %d (src %d, dst %d)"), 489 slog (L_WARN, _("(%s): received corrupted packet type %d (src %d, dst %d)."),
374 (const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ()); 490 (const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ());
375 else 491 else
376 { 492 {
377 connection *c = conns[src - 1]; 493 connection *c = conns[src - 1];
378 494
379 if (dst == 0) 495 if (dst == 0)
380 slog (L_WARN, _("%s(%s): received broadcast (protocol violation)"), 496 slog (L_WARN, _("%s(%s): received broadcast (protocol violation)."),
381 c->conf->nodename, (const char *)rsi); 497 c->conf->nodename, (const char *)rsi);
382 else if (dst != THISNODE->id) 498 else if (dst != THISNODE->id)
383 { 499 {
384 if (THISNODE->routerprio) 500 if (THISNODE->routerprio)
385 // the tos setting gets lost here. who cares. 501 // the tos setting gets lost here. who cares.
386 conns[dst - 1]->inject_vpn_packet (pkt); 502 conns[dst - 1]->inject_vpn_packet (pkt);
387 else 503 else
388 slog (L_WARN, 504 slog (L_WARN,
389 _("%s(%s): forwarding request (=> %s), but we are no router"), 505 _("%s(%s): request to forward packet to %s, but we are no router (config mismatch?)."),
390 c->conf->nodename, (const char *)rsi, 506 c->conf->nodename, (const char *)rsi,
391 conns[dst - 1]->conf->nodename); 507 conns[dst - 1]->conf->nodename);
392 } 508 }
393 else 509 else
394 c->recv_vpn_packet (pkt, rsi); 510 c->recv_vpn_packet (pkt, rsi);
395 } 511 }
396} 512}
397 513
398void 514bool
515vpn::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos)
516{
517 switch (si.prot)
518 {
519 case PROT_IPv4:
520 return send_ipv4_packet (pkt, si, tos);
521
522 case PROT_UDPv4:
523 return send_udpv4_packet (pkt, si, tos);
524
525#if ENABLE_TCP
526 case PROT_TCPv4:
527 return send_tcpv4_packet (pkt, si, tos);
528#endif
529#if ENABLE_ICMP
530 case PROT_ICMPv4:
531 return send_icmpv4_packet (pkt, si, tos);
532#endif
533#if ENABLE_DNS
534 case PROT_DNSv4:
535 return send_dnsv4_packet (pkt, si, tos);
536#endif
537 default:
538 slog (L_CRIT, _("%s: FATAL: trying to send packet with unsupported protocol."), (const char *)si);
539 }
540
541 return false;
542}
543
544inline void
399vpn::ipv4_ev (io_watcher &w, short revents) 545vpn::ipv4_ev (ev::io &w, int revents)
400{ 546{
401 if (revents & EVENT_READ) 547 if (revents & EV_READ)
402 { 548 {
403 vpn_packet *pkt = new vpn_packet; 549 vpn_packet *pkt = new vpn_packet;
404 struct sockaddr_in sa; 550 struct sockaddr_in sa;
405 socklen_t sa_len = sizeof (sa); 551 socklen_t sa_len = sizeof (sa);
406 int len; 552 int len;
… …
411 557
412 if (len > 0) 558 if (len > 0)
413 { 559 {
414 pkt->len = len; 560 pkt->len = len;
415 561
416 // raw sockets deliver the ipv4, but don't expect it on sends 562 // raw sockets deliver the ipv4 header, but don't expect it on sends
417 // this is slow, but...
418 pkt->skip_hdr (IP_OVERHEAD); 563 pkt->skip_hdr (IP_OVERHEAD);
419 564
420 recv_vpn_packet (pkt, si); 565 recv_vpn_packet (pkt, si);
421 } 566 }
422 else 567 else
423 { 568 {
424 // probably ECONNRESET or somesuch 569 // probably ECONNRESET or somesuch
425 slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno)); 570 slog (L_DEBUG, _("%s: %s."), (const char *)si, strerror (errno));
426 } 571 }
427 572
428 delete pkt; 573 delete pkt;
429 } 574 }
430 else 575 else
431 { 576 {
432 slog (L_ERR, 577 slog (L_ERR,
433 _("FATAL: unknown revents %08x in socket, terminating\n"), 578 _("FATAL: unknown revents %08x in socket, exiting.\n"),
434 revents); 579 revents);
435 exit (EXIT_FAILURE); 580 exit (EXIT_FAILURE);
436 } 581 }
437} 582}
438 583
439#if ENABLE_ICMP 584#if ENABLE_ICMP
440void 585inline void
441vpn::icmpv4_ev (io_watcher &w, short revents) 586vpn::icmpv4_ev (ev::io &w, int revents)
442{ 587{
443 if (revents & EVENT_READ) 588 if (revents & EV_READ)
444 { 589 {
445 vpn_packet *pkt = new vpn_packet; 590 vpn_packet *pkt = new vpn_packet;
446 struct sockaddr_in sa; 591 struct sockaddr_in sa;
447 socklen_t sa_len = sizeof (sa); 592 socklen_t sa_len = sizeof (sa);
448 int len; 593 int len;
… …
468 } 613 }
469 } 614 }
470 else 615 else
471 { 616 {
472 // probably ECONNRESET or somesuch 617 // probably ECONNRESET or somesuch
473 slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno)); 618 slog (L_DEBUG, _("%s: %s."), (const char *)si, strerror (errno));
474 } 619 }
475 620
476 delete pkt; 621 delete pkt;
477 } 622 }
478 else 623 else
479 { 624 {
480 slog (L_ERR, 625 slog (L_ERR,
481 _("FATAL: unknown revents %08x in socket, terminating\n"), 626 _("FATAL: unknown revents %08x in socket, exiting.\n"),
482 revents); 627 revents);
483 exit (EXIT_FAILURE); 628 exit (EXIT_FAILURE);
484 } 629 }
485} 630}
486#endif 631#endif
487 632
488void 633inline void
489vpn::udpv4_ev (io_watcher &w, short revents) 634vpn::udpv4_ev (ev::io &w, int revents)
490{ 635{
491 if (revents & EVENT_READ) 636 if (revents & EV_READ)
492 { 637 {
493 vpn_packet *pkt = new vpn_packet; 638 vpn_packet *pkt = new vpn_packet;
494 struct sockaddr_in sa; 639 struct sockaddr_in sa;
495 socklen_t sa_len = sizeof (sa); 640 socklen_t sa_len = sizeof (sa);
496 int len; 641 int len;
… …
506 recv_vpn_packet (pkt, si); 651 recv_vpn_packet (pkt, si);
507 } 652 }
508 else 653 else
509 { 654 {
510 // probably ECONNRESET or somesuch 655 // probably ECONNRESET or somesuch
511 slog (L_DEBUG, _("%s: fd %d, %s"), (const char *)si, w.fd, strerror (errno)); 656 slog (L_DEBUG, _("%s: fd %d, %s."), (const char *)si, w.fd, strerror (errno));
512 } 657 }
513 658
514 delete pkt; 659 delete pkt;
515 } 660 }
516 else 661 else
517 { 662 {
518 slog (L_ERR, 663 slog (L_ERR,
519 _("FATAL: unknown revents %08x in socket, terminating\n"), 664 _("FATAL: unknown revents %08x in socket, exiting.\n"),
520 revents); 665 revents);
521 exit (EXIT_FAILURE); 666 exit (EXIT_FAILURE);
522 } 667 }
523} 668}
524 669
525void 670inline void
526vpn::tap_ev (io_watcher &w, short revents) 671vpn::tap_ev (ev::io &w, int revents)
527{ 672{
528 if (revents & EVENT_READ) 673 if (revents & EV_READ)
529 { 674 {
530 /* process data */ 675 /* process data */
531 tap_packet *pkt; 676 tap_packet *pkt;
532 677
533 pkt = tap->recv (); 678 pkt = tap->recv ();
… …
540 int dst = mac2id (pkt->dst); 685 int dst = mac2id (pkt->dst);
541 int src = mac2id (pkt->src); 686 int src = mac2id (pkt->src);
542 687
543 if (src != THISNODE->id) 688 if (src != THISNODE->id)
544 { 689 {
545 slog (L_ERR, _("FATAL: tap packet not originating on current node received, exiting.")); 690 slog (L_ERR, _("FATAL: tap packet not originating on current node received (if-up script not working properly?), exiting."));
546 exit (EXIT_FAILURE); 691 exit (EXIT_FAILURE);
547 } 692 }
548 693
549 if (dst == THISNODE->id) 694 if (dst == THISNODE->id)
550 { 695 {
… …
562 } 707 }
563 else 708 else
564 abort (); 709 abort ();
565} 710}
566 711
567void 712inline void
568vpn::event_cb (time_watcher &w) 713vpn::event_cb (ev::timer &w, int)
569{ 714{
570 if (events) 715 if (events)
571 { 716 {
572 if (events & EVENT_SHUTDOWN) 717 if (events & EVENT_SHUTDOWN)
573 { 718 {
574 slog (L_INFO, _("preparing shutdown...")); 719 slog (L_INFO, _("preparing shutdown..."));
575 720
576 shutdown_all (); 721 shutdown_all ();
577 remove_pid (conf.pidfilename); 722 remove_pid (conf.pidfilename);
578 slog (L_INFO, _("terminating")); 723 slog (L_INFO, _("exiting."));
579 exit (EXIT_SUCCESS); 724 exit (EXIT_SUCCESS);
580 } 725 }
581 726
582 if (events & EVENT_RECONNECT) 727 if (events & EVENT_RECONNECT)
583 { 728 {
584 slog (L_INFO, _("forced reconnect")); 729 slog (L_INFO, _("forced reconnect."));
585 730
586 reconnect_all (); 731 reconnect_all ();
587 } 732 }
588 733
589 events = 0; 734 events = 0;
… …
605 750
606 conns.clear (); 751 conns.clear ();
607 752
608 connection_init (); 753 connection_init ();
609 754
610 for (configuration::node_vector::iterator i = conf.nodes.begin (); 755 for (configuration::node_vector::iterator i = conf.nodes.begin (); i != conf.nodes.end (); ++i)
611 i != conf.nodes.end (); ++i) 756 conns.push_back (new connection (this, *i));
612 { 757
613 connection *conn = new connection (this, *i); 758 for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)
614 conns.push_back (conn);
615 conn->establish_connection (); 759 (*c)->establish_connection ();
616 }
617} 760}
618 761
619connection *vpn::find_router () 762bool vpn::can_direct (conf_node *src, conf_node *dst) const
620{ 763{
621 u32 prio = 1; 764 return src != dst
765 && src->may_direct (dst)
766 && dst->may_direct (src)
767 && (((src->protocols & dst->protocols) && src->connectmode == conf_node::C_ALWAYS)
768 || (src->protocols & dst->connectable_protocols ()));
769}
770
771// only works for indirect and routed connections: find a router
772// from THISNODE to dst
773connection *vpn::find_router_for (const connection *dst)
774{
622 connection *router = 0; 775 connection *router = 0;
623 776
777 // first try to find a router with a direct connection, route there
778 // regardless of any other considerations.
779 {
780 u32 prio = 1;
781
782 for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)
783 {
784 connection *c = *i;
785
786 if (c->conf->routerprio > prio
787 && c->conf != THISNODE
788 && can_direct (c->conf, dst->conf)
789 && c->ictx && c->octx)
790 {
791 prio = c->conf->routerprio;
792 router = c;
793 }
794 }
795 }
796
797 if (router)
798 return router;
799
800 // second try find the router with the highest priority, higher than ours
801 {
802 u32 prio = THISNODE->routerprio ? THISNODE->routerprio : 1;
803
804 for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)
805 {
806 connection *c = *i;
807
808 if (c->conf->routerprio > prio
809 && c != dst
810 && c->conf != THISNODE
811 && c->ictx && c->octx)
812 {
813 prio = c->conf->routerprio;
814 router = c;
815 }
816 }
817 }
818
819 return router;
820}
821
822void vpn::connection_established (connection *c)
823{
624 for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i) 824 for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)
625 { 825 {
626 connection *c = *i; 826 connection *o = *i;
627 827
628 if (c->conf->routerprio > prio 828 if (!o->is_direct
629 && c->connectmode == conf_node::C_ALWAYS // so we don't drop the connection if in use 829 && o->si.valid ()
630 && c->ictx && c->octx 830 && c->si != o->si
631 && c->conf != THISNODE) // redundant, since ictx==octx==0 always on thisnode 831 && c == find_router_for (o))
632 {
633 prio = c->conf->routerprio;
634 router = c;
635 } 832 {
833 slog (L_DEBUG, _("%s: can now route packets via %s, re-keying connection."),
834 o->conf->nodename, c->conf->nodename);
835 o->rekey ();
836 }
636 } 837 }
637
638 return router;
639} 838}
640 839
641void vpn::send_connect_request (int id) 840void vpn::send_connect_request (connection *c)
642{ 841{
643 connection *c = find_router (); 842 connection *r = find_router_for (c);
644 843
645 if (c) 844 if (r)
845 {
846 slog (L_TRACE, _("%s: no address known, sending mediated connection request via %s."),
847 c->conf->nodename, r->conf->nodename);
646 c->send_connect_request (id); 848 r->send_connect_request (c->conf->id);
849 }
647 else 850 else
648 // no router found, aggressively connect to all routers 851 slog (L_DEBUG, _("%s: no way to connect and no router found: unable to connect at this time."),
649 for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i) 852 c->conf->nodename);
650 if ((*i)->conf->routerprio && (*i)->conf != THISNODE)
651 (*i)->establish_connection ();
652} 853}
653 854
654void 855void
655connection::dump_status () 856connection::dump_status ()
656{ 857{
657 slog (L_NOTICE, _("node %s (id %d)"), conf->nodename, conf->id); 858 slog (L_NOTICE, _("node %s (id %d)"), conf->nodename, conf->id);
658 slog (L_NOTICE, _(" connectmode %d (%d) / sockaddr %s / minor %d"), 859 slog (L_NOTICE, _(" connectmode %d (%d) / sockaddr %s / minor %d"),
659 connectmode, conf->connectmode, (const char *)si, (int)prot_minor); 860 connectmode, conf->connectmode, (const char *)si, (int)prot_minor);
660 slog (L_NOTICE, _(" ictx/octx %08lx/%08lx / oseqno %d / retry_cnt %d"), 861 slog (L_NOTICE, _(" ictx/octx %08lx/%08lx / oseqno %d / retry_cnt %d"),
661 (long)ictx, (long)octx, (int)oseqno, (int)retry_cnt); 862 (long)ictx, (long)octx, (int)oseqno, (int)retry_cnt);
662 slog (L_NOTICE, _(" establish_conn %ld / rekey %ld / keepalive %ld"),
663 (long)(establish_connection.at), (long)(rekey.at), (long)(keepalive.at));
664} 863}
665 864
666void 865void
667vpn::dump_status () 866vpn::dump_status ()
668{ 867{
669 slog (L_NOTICE, _("BEGIN status dump (%ld)"), (long)NOW); 868 slog (L_NOTICE, _("BEGIN status dump (%ld)"), (long)ev_now ());
670 869
671 for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c) 870 for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)
672 (*c)->dump_status (); 871 (*c)->dump_status ();
673 872
674 slog (L_NOTICE, _("END status dump")); 873 slog (L_NOTICE, _("END status dump"));
675} 874}
676 875
677vpn::vpn (void) 876vpn::vpn (void)
877{
678: event (this, &vpn::event_cb) 878 event .set<vpn, &vpn::event_cb > (this);
679, udpv4_ev_watcher (this, &vpn::udpv4_ev) 879 udpv4_ev_watcher .set<vpn, &vpn::udpv4_ev > (this);
680, ipv4_ev_watcher (this, &vpn::ipv4_ev) 880 ipv4_ev_watcher .set<vpn, &vpn::ipv4_ev > (this);
681#if ENABLE_TCP 881#if ENABLE_TCP
682, tcpv4_ev_watcher (this, &vpn::tcpv4_ev) 882 tcpv4_ev_watcher .set<vpn, &vpn::tcpv4_ev > (this);
683#endif 883#endif
684#if ENABLE_ICMP 884#if ENABLE_ICMP
685, icmpv4_ev_watcher(this, &vpn::icmpv4_ev) 885 icmpv4_ev_watcher.set<vpn, &vpn::icmpv4_ev> (this);
686#endif 886#endif
687#if ENABLE_DNS 887#if ENABLE_DNS
688, dnsv4_ev_watcher (this, &vpn::dnsv4_ev) 888 dnsv4_ev_watcher .set<vpn, &vpn::dnsv4_ev > (this);
689#endif 889#endif
690, tap_ev_watcher (this, &vpn::tap_ev) 890 tap_ev_watcher .set<vpn, &vpn::tap_ev > (this);
691{
692} 891}
693 892
694vpn::~vpn () 893vpn::~vpn ()
695{ 894{
696} 895}

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