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Comparing gvpe/src/vpn.C (file contents):
Revision 1.23 by pcg, Thu Jan 29 18:55:10 2004 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) 2003-2004 Marc Lehmann <pcg@goof.com> 3 Copyright (C) 2003-2008 Marc Lehmann <gvpe@schmorp.de>
4 4
5 This file is part of GVPE.
6
5 This program is free software; you can redistribute it and/or modify 7 GVPE is free software; you can redistribute it and/or modify it
6 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
7 the Free Software Foundation; either version 2 of the License, or 9 Free Software Foundation; either version 3 of the License, or (at your
8 (at your option) any later version. 10 option) any later version.
9 11
10 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
11 but WITHOUT ANY WARRANTY; without even the implied warranty of 13 WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
13 GNU General Public License for more details. 15 Public License for more details.
14 16
15 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
16 along with this program; if not, write to the Free Software 18 with this program; if not, see <http://www.gnu.org/licenses/>.
17 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.
18*/ 30*/
19 31
20#include "config.h" 32#include "config.h"
21 33
22#include <list> 34#include <list>
… …
44 56
45vpn network; // THE vpn (bad design...) 57vpn network; // THE vpn (bad design...)
46 58
47///////////////////////////////////////////////////////////////////////////// 59/////////////////////////////////////////////////////////////////////////////
48 60
49const 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 ()
50{ 75{
51 // the tunnel device mtu should be the physical mtu - overhead 76 // the tunnel device mtu should be the physical mtu - overhead
52 // the tricky part is rounding to the cipher key blocksize 77 // the tricky part is rounding to the cipher key blocksize
53 int mtu = conf.mtu - ETH_OVERHEAD - VPE_OVERHEAD - MAX_OVERHEAD; 78 int mtu = conf.mtu - ETH_OVERHEAD - VPE_OVERHEAD - MAX_OVERHEAD;
54 mtu += ETH_OVERHEAD - 6 - 6; // now we have the data portion 79 mtu += ETH_OVERHEAD - 6 - 6; // now we have the data portion
55 mtu -= mtu % EVP_CIPHER_block_size (CIPHER); // round 80 mtu -= mtu % EVP_CIPHER_block_size (CIPHER); // round
56 mtu -= ETH_OVERHEAD - 6 - 6; // and get interface mtu again 81 mtu -= ETH_OVERHEAD - 6 - 6; // and get interface mtu again
57 82
58 char *env; 83 char *env;
59 asprintf (&env, "CONFBASE=%s", confbase); putenv (env); 84 asprintf (&env, "CONFBASE=%s", confbase); putenv (env);
60 asprintf (&env, "NODENAME=%s", THISNODE->nodename); putenv (env);
61 asprintf (&env, "NODEID=%d", THISNODE->id); putenv (env);
62 asprintf (&env, "IFNAME=%s", tap->interface ()); putenv (env); 85 asprintf (&env, "IFNAME=%s", tap->interface ()); putenv (env);
63 asprintf (&env, "IFTYPE=%s", IFTYPE); putenv (env); 86 asprintf (&env, "IFTYPE=%s", IFTYPE); putenv (env);
64 asprintf (&env, "IFSUBTYPE=%s", IFSUBTYPE); putenv (env); 87 asprintf (&env, "IFSUBTYPE=%s", IFSUBTYPE); putenv (env);
65 asprintf (&env, "MTU=%d", mtu); putenv (env); 88 asprintf (&env, "MTU=%d", mtu); putenv (env);
66 asprintf (&env, "MAC=%02x:%02x:%02x:%02x:%02x:%02x", 89 asprintf (&env, "NODES=%d", conns.size ()); putenv (env);
67 0xfe, 0xfd, 0x80, 0x00, THISNODE->id >> 8, 90 asprintf (&env, "NODEID=%d", THISNODE->id); putenv (env);
68 THISNODE->id & 0xff);
69 putenv (env);
70 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,
71 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;
72} 144}
73 145
74int 146int
75vpn::setup () 147vpn::setup ()
76{ 148{
149 int success = 0;
150
151 ipv4_tos = -1;
77 ipv4_fd = -1; 152 ipv4_fd = -1;
78 153
79 if (THISNODE->protocols & PROT_IPv4 && ::conf.ip_proto) 154 if (THISNODE->protocols & PROT_IPv4 && ::conf.ip_proto)
80 { 155 {
81 ipv4_fd = socket (PF_INET, SOCK_RAW, ::conf.ip_proto); 156 ipv4_fd = setup_socket (PROT_IPv4, PF_INET, SOCK_RAW, ::conf.ip_proto);
82 157
83 if (ipv4_fd < 0) 158 if (ipv4_fd < 0)
84 return -1; 159 return -1;
85
86 fcntl (ipv4_fd, F_SETFL, O_NONBLOCK);
87 160
88#if defined(SOL_IP) && defined(IP_MTU_DISCOVER) 161#if defined(SOL_IP) && defined(IP_MTU_DISCOVER)
89 // this I really consider a linux bug. I am neither connected 162 // this I really consider a linux bug. I am neither connected
90 // 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
91 // fragment for me sometimes. 164 // fragment for me sometimes.
… …
97 170
98 sockinfo si (THISNODE, PROT_IPv4); 171 sockinfo si (THISNODE, PROT_IPv4);
99 172
100 if (bind (ipv4_fd, si.sav4 (), si.salenv4 ())) 173 if (bind (ipv4_fd, si.sav4 (), si.salenv4 ()))
101 { 174 {
102 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));
103 exit (EXIT_FAILURE); 176 return -1;
104 } 177 }
105 178
106 ipv4_ev_watcher.start (ipv4_fd, EVENT_READ); 179 ipv4_ev_watcher.start (ipv4_fd, EV_READ);
180 ++success;
107 } 181 }
182 else
183 THISNODE->protocols &= ~PROT_IPv4;
108 184
185 udpv4_tos = -1;
109 udpv4_fd = -1; 186 udpv4_fd = -1;
110 187
111 if (THISNODE->protocols & PROT_UDPv4 && THISNODE->udp_port) 188 if (THISNODE->protocols & PROT_UDPv4 && THISNODE->udp_port)
112 { 189 {
113 udpv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP); 190 udpv4_fd = setup_socket (PROT_UDPv4, PF_INET, SOCK_DGRAM, IPPROTO_UDP);
114 191
115 if (udpv4_fd < 0) 192 if (udpv4_fd < 0)
116 return -1; 193 return -1;
117
118 fcntl (udpv4_fd, F_SETFL, O_NONBLOCK);
119 194
120 // standard daemon practise... 195 // standard daemon practise...
121 { 196 {
122 int oval = 1; 197 int oval = 1;
123 setsockopt (udpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval); 198 setsockopt (udpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);
… …
135 210
136 sockinfo si (THISNODE, PROT_UDPv4); 211 sockinfo si (THISNODE, PROT_UDPv4);
137 212
138 if (bind (udpv4_fd, si.sav4 (), si.salenv4 ())) 213 if (bind (udpv4_fd, si.sav4 (), si.salenv4 ()))
139 { 214 {
140 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));
141 exit (EXIT_FAILURE); 216 return -1;
142 } 217 }
143 218
144 udpv4_ev_watcher.start (udpv4_fd, EVENT_READ); 219 udpv4_ev_watcher.start (udpv4_fd, EV_READ);
220 ++success;
145 } 221 }
222 else
223 THISNODE->protocols &= ~PROT_UDPv4;
146 224
225 icmpv4_tos = -1;
147 icmpv4_fd = -1; 226 icmpv4_fd = -1;
148 227
149#if ENABLE_ICMP 228#if ENABLE_ICMP
150 if (THISNODE->protocols & PROT_ICMPv4) 229 if (THISNODE->protocols & PROT_ICMPv4)
151 { 230 {
152 icmpv4_fd = socket (PF_INET, SOCK_RAW, IPPROTO_ICMP); 231 icmpv4_fd = setup_socket (PROT_ICMPv4, PF_INET, SOCK_RAW, IPPROTO_ICMP);
153 232
154 if (icmpv4_fd < 0) 233 if (icmpv4_fd < 0)
155 return -1; 234 return -1;
156
157 fcntl (icmpv4_fd, F_SETFL, O_NONBLOCK);
158 235
159#ifdef ICMP_FILTER 236#ifdef ICMP_FILTER
160 { 237 {
161 icmp_filter oval; 238 icmp_filter oval;
162 oval.data = 0xffffffff; 239 oval.data = 0xffffffff;
… …
171 // this I really consider a linux bug. I am neither connected 248 // this I really consider a linux bug. I am neither connected
172 // 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
173 // fragment for me sometimes. 250 // fragment for me sometimes.
174 { 251 {
175 int oval = IP_PMTUDISC_DONT; 252 int oval = IP_PMTUDISC_DONT;
176 setsockopt (udpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval); 253 setsockopt (icmpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);
177 } 254 }
178#endif 255#endif
179 256
180 sockinfo si (THISNODE, PROT_ICMPv4); 257 sockinfo si (THISNODE, PROT_ICMPv4);
181 258
182 if (bind (icmpv4_fd, si.sav4 (), si.salenv4 ())) 259 if (bind (icmpv4_fd, si.sav4 (), si.salenv4 ()))
183 { 260 {
184 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));
185 exit (EXIT_FAILURE); 262 return -1;
186 } 263 }
187 264
188 icmpv4_ev_watcher.start (icmpv4_fd, EVENT_READ); 265 icmpv4_ev_watcher.start (icmpv4_fd, EV_READ);
266 ++success;
189 } 267 }
190#endif 268#endif
191 269
192 tcpv4_fd = -1; 270 tcpv4_fd = -1;
193 271
194#if ENABLE_TCP 272#if ENABLE_TCP
195 if (THISNODE->protocols & PROT_TCPv4 && THISNODE->tcp_port) 273 if (THISNODE->protocols & PROT_TCPv4 && THISNODE->tcp_port)
196 { 274 {
197 tcpv4_fd = socket (PF_INET, SOCK_STREAM, IPPROTO_TCP); 275 tcpv4_fd = setup_socket (PROT_TCPv4, PF_INET, SOCK_STREAM, IPPROTO_TCP);
198 276
199 if (tcpv4_fd < 0) 277 if (tcpv4_fd < 0)
200 return -1; 278 return -1;
201 279
202 fcntl (tcpv4_fd, F_SETFL, O_NONBLOCK);
203
204 // standard daemon practise... 280 // standard daemon practise...
205 { 281 {
206 int oval = 1; 282 int oval = 1;
207 setsockopt (tcpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval); 283 setsockopt (tcpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);
208 } 284 }
209 285
210 sockinfo si (THISNODE, PROT_TCPv4); 286 sockinfo si (THISNODE, PROT_TCPv4);
211 287
212 if (bind (tcpv4_fd, si.sav4 (), si.salenv4 ())) 288 if (bind (tcpv4_fd, si.sav4 (), si.salenv4 ()))
213 { 289 {
214 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));
215 exit (EXIT_FAILURE); 291 return -1;
216 } 292 }
217 293
218 if (listen (tcpv4_fd, 5)) 294 if (listen (tcpv4_fd, 5))
219 { 295 {
220 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));
221 exit (EXIT_FAILURE); 297 return -1;
222 } 298 }
223 299
224 tcpv4_ev_watcher.start (tcpv4_fd, EVENT_READ); 300 tcpv4_ev_watcher.start (tcpv4_fd, EV_READ);
301 ++success;
302 }
303 else
304 THISNODE->protocols &= ~PROT_TCPv4;
305#endif
306
307 dnsv4_tos = -1;
308 dnsv4_fd = -1;
309
310#if ENABLE_DNS
311 if (THISNODE->protocols & PROT_DNSv4)
312 {
313 dns_forwarder.set (::conf.dns_forw_host, ::conf.dns_forw_port, PROT_DNSv4);
314
315 dnsv4_fd = setup_socket (PROT_DNSv4, PF_INET, SOCK_DGRAM, IPPROTO_UDP);
316
317 if (dnsv4_fd < 0)
318 return -1;
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);
225 } 327 }
226#endif 328# endif
329
330 // standard daemon practise...
331 {
332 int oval = 1;
333 setsockopt (dnsv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);
334 }
335
336 sockinfo si (THISNODE->dns_hostname,
337 THISNODE->dns_hostname ? THISNODE->dns_port : 0,
338 PROT_DNSv4);
339
340 if (bind (dnsv4_fd, si.sav4 (), si.salenv4 ()))
341 {
342 slog (L_ERR, _("can't bind dnsv4 on %s: %s, exiting."), (const char *)si, strerror (errno));
343 return -1;
344 }
345
346 dnsv4_ev_watcher.start (dnsv4_fd, EV_READ);
347 ++success;
348 }
349#endif
350
351 /////////////////////////////////////////////////////////////////////////////
352
353 if (!success)
354 {
355 slog (L_ERR, _("no protocols enabled."));
356 return -1;
357 }
358
359 reconnect_all ();
360
361 /////////////////////////////////////////////////////////////////////////////
227 362
228 tap = new tap_device (); 363 tap = new tap_device ();
229 if (!tap) //D this, of course, never catches 364 if (!tap) //D this, of course, never catches
230 { 365 {
231 slog (L_ERR, _("cannot create network interface '%s'"), conf.ifname); 366 slog (L_ERR, _("cannot create network interface '%s'."), conf.ifname);
232 exit (EXIT_FAILURE); 367 return -1;
233 } 368 }
234 369
235 run_script (run_script_cb (this, &vpn::script_if_up), true); 370 fcntl (tap->fd, F_SETFD, FD_CLOEXEC);
236 371
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
237 tap_ev_watcher.start (tap->fd, EVENT_READ); 390 tap_ev_watcher.start (tap->fd, EV_READ);
238
239 reconnect_all ();
240 391
241 return 0; 392 return 0;
242}
243
244// send a vpn packet out to other hosts
245bool
246vpn::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos)
247{
248 switch (si.prot)
249 {
250 case PROT_IPv4:
251 return send_ipv4_packet (pkt, si, tos);
252
253 case PROT_UDPv4:
254 return send_udpv4_packet (pkt, si, tos);
255
256#if ENABLE_TCP
257 case PROT_TCPv4:
258 return send_tcpv4_packet (pkt, si, tos);
259#endif
260
261#if ENABLE_ICMP
262 case PROT_ICMPv4:
263 return send_icmpv4_packet (pkt, si, tos);
264#endif
265
266 default:
267 slog (L_CRIT, _("%s: FATAL: trying to send packet with unsupported protocol"), (const char *)si);
268 return false;
269 }
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 (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 {
613 connection *conn = new connection (this);
614 757
615 conn->conf = *i; 758 for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)
616 conns.push_back (conn);
617
618 conn->establish_connection (); 759 (*c)->establish_connection ();
619 }
620} 760}
621 761
622connection *vpn::find_router () 762bool vpn::can_direct (conf_node *src, conf_node *dst) const
623{ 763{
624 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{
625 connection *router = 0; 775 connection *router = 0;
626 776
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{
627 for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i) 824 for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)
628 { 825 {
629 connection *c = *i; 826 connection *o = *i;
630 827
631 if (c->conf->routerprio > prio 828 if (!o->is_direct
632 && c->connectmode == conf_node::C_ALWAYS // so we don't drop the connection if in use 829 && o->si.valid ()
633 && c->ictx && c->octx 830 && c->si != o->si
634 && c->conf != THISNODE) // redundant, since ictx==octx==0 always on thisnode 831 && c == find_router_for (o))
635 {
636 prio = c->conf->routerprio;
637 router = c;
638 } 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 }
639 } 837 }
640
641 return router;
642} 838}
643 839
644void vpn::send_connect_request (int id) 840void vpn::send_connect_request (connection *c)
645{ 841{
646 connection *c = find_router (); 842 connection *r = find_router_for (c);
647 843
648 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);
649 c->send_connect_request (id); 848 r->send_connect_request (c->conf->id);
849 }
650 else 850 else
651 // 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."),
652 for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i) 852 c->conf->nodename);
653 if ((*i)->conf->routerprio && (*i)->conf != THISNODE)
654 (*i)->establish_connection ();
655} 853}
656 854
657void 855void
658connection::dump_status () 856connection::dump_status ()
659{ 857{
660 slog (L_NOTICE, _("node %s (id %d)"), conf->nodename, conf->id); 858 slog (L_NOTICE, _("node %s (id %d)"), conf->nodename, conf->id);
661 slog (L_NOTICE, _(" connectmode %d (%d) / sockaddr %s / minor %d"), 859 slog (L_NOTICE, _(" connectmode %d (%d) / sockaddr %s / minor %d"),
662 connectmode, conf->connectmode, (const char *)si, (int)prot_minor); 860 connectmode, conf->connectmode, (const char *)si, (int)prot_minor);
663 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"),
664 (long)ictx, (long)octx, (int)oseqno, (int)retry_cnt); 862 (long)ictx, (long)octx, (int)oseqno, (int)retry_cnt);
665 slog (L_NOTICE, _(" establish_conn %ld / rekey %ld / keepalive %ld"),
666 (long)(establish_connection.at), (long)(rekey.at), (long)(keepalive.at));
667} 863}
668 864
669void 865void
670vpn::dump_status () 866vpn::dump_status ()
671{ 867{
672 slog (L_NOTICE, _("BEGIN status dump (%ld)"), (long)NOW); 868 slog (L_NOTICE, _("BEGIN status dump (%ld)"), (long)ev_now ());
673 869
674 for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c) 870 for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)
675 (*c)->dump_status (); 871 (*c)->dump_status ();
676 872
677 slog (L_NOTICE, _("END status dump")); 873 slog (L_NOTICE, _("END status dump"));
678} 874}
679 875
680vpn::vpn (void) 876vpn::vpn (void)
877{
681: event (this, &vpn::event_cb) 878 event .set<vpn, &vpn::event_cb > (this);
682, udpv4_ev_watcher (this, &vpn::udpv4_ev) 879 udpv4_ev_watcher .set<vpn, &vpn::udpv4_ev > (this);
683, ipv4_ev_watcher (this, &vpn::ipv4_ev) 880 ipv4_ev_watcher .set<vpn, &vpn::ipv4_ev > (this);
684#if ENABLE_TCP 881#if ENABLE_TCP
685, tcpv4_ev_watcher (this, &vpn::tcpv4_ev) 882 tcpv4_ev_watcher .set<vpn, &vpn::tcpv4_ev > (this);
686#endif 883#endif
687#if ENABLE_ICMP 884#if ENABLE_ICMP
688, icmpv4_ev_watcher(this, &vpn::icmpv4_ev) 885 icmpv4_ev_watcher.set<vpn, &vpn::icmpv4_ev> (this);
689#endif 886#endif
690, tap_ev_watcher (this, &vpn::tap_ev) 887#if ENABLE_DNS
691{ 888 dnsv4_ev_watcher .set<vpn, &vpn::dnsv4_ev > (this);
889#endif
890 tap_ev_watcher .set<vpn, &vpn::tap_ev > (this);
692} 891}
693 892
694vpn::~vpn () 893vpn::~vpn ()
695{ 894{
696} 895}

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