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Comparing gvpe/src/vpn.C (file contents):
Revision 1.39 by pcg, Sat Nov 10 05:14:22 2007 UTC vs.
Revision 1.71 by root, Thu Oct 6 03:25:54 2022 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) 2003-2008,2010,2011,2013 Marc Lehmann <gvpe@schmorp.de>
4 4
5 This file is part of GVPE. 5 This file is part of GVPE.
6 6
7 GVPE is free software; you can redistribute it and/or modify 7 GVPE is free software; you can redistribute it and/or modify it
8 it under the terms of the GNU General Public License as published by 8 under the terms of the GNU General Public License as published by the
9 the Free Software Foundation; either version 2 of the License, or 9 Free Software Foundation; either version 3 of the License, or (at your
10 (at your option) any later version. 10 option) any later version.
11 11
12 This program is distributed in the hope that it will be useful, 12 This program is distributed in the hope that it will be useful, but
13 but WITHOUT ANY WARRANTY; without even the implied warranty of 13 WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
15 GNU General Public License for more details. 15 Public License for more details.
16 16
17 You should have received a copy of the GNU General Public License 17 You should have received a copy of the GNU General Public License along
18 along with gvpe; if not, write to the Free Software 18 with this program; if not, see <http://www.gnu.org/licenses/>.
19 Foundation, Inc. 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 19
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>
… …
28#include <cstdlib> 38#include <cstdlib>
29 39
30#include <sys/types.h> 40#include <sys/types.h>
31#include <sys/socket.h> 41#include <sys/socket.h>
32#include <sys/wait.h> 42#include <sys/wait.h>
43#include <sys/stat.h>
33#include <errno.h> 44#include <errno.h>
34#include <time.h> 45#include <time.h>
35#include <unistd.h> 46#include <unistd.h>
36#include <fcntl.h> 47#include <fcntl.h>
37#include <sys/socket.h> 48#include <sys/socket.h>
… …
42 53
43#include "connection.h" 54#include "connection.h"
44#include "util.h" 55#include "util.h"
45#include "vpn.h" 56#include "vpn.h"
46 57
58using namespace std;
59
47vpn network; // THE vpn (bad design...) 60vpn network; // THE vpn (bad design...)
48 61
49///////////////////////////////////////////////////////////////////////////// 62/////////////////////////////////////////////////////////////////////////////
63
64// hopefully temporary workaround for rare buffer full conditions
65// if it happens, usually instantly retrying or retrying ~5ms later
66// is good enough with current network technologies/kernels
67
68static ssize_t
69xsendto (int fd, const void *buf, size_t len, int flags,
70 const struct sockaddr *sa, socklen_t salen)
71{
72 ssize_t res;
73
74 for (int retry = 0; retry <= 13; ++retry) // ~100ms
75 {
76 res = sendto (fd, buf, len, flags, sa, salen);
77
78 if (res >= 0 || errno != ENOBUFS)
79 break;
80
81 struct timespec ts = { 0, 1000 * retry };
82 nanosleep (&ts, 0);
83 }
84
85 return res;
86}
87
88/////////////////////////////////////////////////////////////////////////////
89
90static void inline
91set_tos (int fd, int &tos_prev, int tos)
92{
93#if defined(SOL_IP) && defined(IP_TOS)
94 if (tos_prev == tos)
95 return;
96
97 tos_prev = tos;
98 setsockopt (fd, SOL_IP, IP_TOS, &tos, sizeof tos);
99#endif
100}
50 101
51void 102void
52vpn::script_init_env () 103vpn::script_init_env ()
53{ 104{
54 // the tunnel device mtu should be the physical mtu - overhead 105 // the tunnel device mtu should be the physical mtu - overhead
55 // the tricky part is rounding to the cipher key blocksize 106 // the tricky part is rounding to the cipher key blocksize
56 int mtu = conf.mtu - ETH_OVERHEAD - VPE_OVERHEAD - MAX_OVERHEAD; 107 int mtu = conf.mtu - ETH_OVERHEAD - VPE_OVERHEAD - MAX_OVERHEAD;
57 mtu += ETH_OVERHEAD - 6 - 6; // now we have the data portion 108 mtu += ETH_OVERHEAD - 6 - 6; // now we have the data portion
58 mtu -= mtu % EVP_CIPHER_block_size (CIPHER); // round 109 mtu -= mtu % BLOCK_SIZE (CIPHER); // round
59 mtu -= ETH_OVERHEAD - 6 - 6; // and get interface mtu again 110 mtu -= ETH_OVERHEAD - 6 - 6; // and get interface mtu again
60 111
61 char *env; 112 char *env;
62 asprintf (&env, "CONFBASE=%s", confbase); putenv (env); 113 asprintf (&env, "CONFBASE=%s", confbase); putenv (env);
63 asprintf (&env, "IFNAME=%s", tap->interface ()); putenv (env); 114 asprintf (&env, "IFNAME=%s", tap->interface ()); putenv (env);
… …
75 snprintf (ext, 16, "_%d", (*c)->conf->id); 126 snprintf (ext, 16, "_%d", (*c)->conf->id);
76 (*c)->script_init_env (ext); 127 (*c)->script_init_env (ext);
77 } 128 }
78} 129}
79 130
131inline const char *
80const char *vpn::script_if_init () 132vpn::script_if_init ()
81{ 133{
82 script_init_env (); 134 script_init_env ();
83 135
84 return tap->if_up (); 136 return tap->if_up ();
85} 137}
86 138
139inline const char *
87const char *vpn::script_if_up () 140vpn::script_if_up ()
88{ 141{
89 script_init_env (); 142 script_init_env ();
90 143
91 char *filename; 144 return conf.config_filename (::conf.script_if_up, "if-up");
92 asprintf (&filename, 145}
93 "%s/%s",
94 confbase,
95 ::conf.script_if_up ? ::conf.script_if_up : "if-up");
96 146
97 return filename; 147int
148vpn::setup_socket (u8 prot, int family, int type, int proto)
149{
150 int fd = socket (family, type, proto);
151
152 if (fd < 0)
153 {
154 slog (L_ERR, _("unable to create %s socket: %s."), strprotocol (prot), strerror (errno));
155 return fd;
156 }
157
158 fcntl (fd, F_SETFL, O_NONBLOCK);
159 fcntl (fd, F_SETFD, FD_CLOEXEC);
160
161#ifdef SO_MARK
162 if (::conf.nfmark)
163 if (setsockopt (fd, SOL_SOCKET, SO_MARK, &::conf.nfmark, sizeof ::conf.nfmark))
164 slog (L_WARN, _("unable to set nfmark on %s socket: %s"), strprotocol (prot), strerror (errno));
165#endif
166
167 return fd;
98} 168}
99 169
100int 170int
101vpn::setup () 171vpn::setup ()
102{ 172{
173 int success = 0;
174
175 ipv4_tos = -1;
103 ipv4_fd = -1; 176 ipv4_fd = -1;
104 177
105 if (THISNODE->protocols & PROT_IPv4 && ::conf.ip_proto) 178 if (THISNODE->protocols & PROT_IPv4 && ::conf.ip_proto)
106 { 179 {
107 ipv4_fd = socket (PF_INET, SOCK_RAW, ::conf.ip_proto); 180 ipv4_fd = setup_socket (PROT_IPv4, PF_INET, SOCK_RAW, ::conf.ip_proto);
108 181
109 if (ipv4_fd < 0) 182 if (ipv4_fd < 0)
110 return -1; 183 return -1;
111
112 fcntl (ipv4_fd, F_SETFL, O_NONBLOCK);
113 fcntl (ipv4_fd, F_SETFD, FD_CLOEXEC);
114 184
115#if defined(SOL_IP) && defined(IP_MTU_DISCOVER) 185#if defined(SOL_IP) && defined(IP_MTU_DISCOVER)
116 // this I really consider a linux bug. I am neither connected 186 // this I really consider a linux bug. I am neither connected
117 // nor do I fragment myself. Linux still sets DF and doesn't 187 // nor do I fragment myself. Linux still sets DF and doesn't
118 // fragment for me sometimes. 188 // fragment for me sometimes.
… …
124 194
125 sockinfo si (THISNODE, PROT_IPv4); 195 sockinfo si (THISNODE, PROT_IPv4);
126 196
127 if (bind (ipv4_fd, si.sav4 (), si.salenv4 ())) 197 if (bind (ipv4_fd, si.sav4 (), si.salenv4 ()))
128 { 198 {
129 slog (L_ERR, _("can't bind ipv4 socket on %s: %s"), (const char *)si, strerror (errno)); 199 slog (L_ERR, _("can't bind ipv4 socket on %s: %s, exiting."), (const char *)si, strerror (errno));
130 exit (EXIT_FAILURE); 200 return -1;
131 } 201 }
132 202
133 ipv4_ev_watcher.start (ipv4_fd, EV_READ); 203 ipv4_ev_watcher.start (ipv4_fd, EV_READ);
204 ++success;
134 } 205 }
206 else
207 THISNODE->protocols &= ~PROT_IPv4;
135 208
209 udpv4_tos = -1;
136 udpv4_fd = -1; 210 udpv4_fd = -1;
137 211
138 if (THISNODE->protocols & PROT_UDPv4 && THISNODE->udp_port) 212 if (THISNODE->protocols & PROT_UDPv4 && THISNODE->udp_port)
139 { 213 {
140 udpv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP); 214 udpv4_fd = setup_socket (PROT_UDPv4, PF_INET, SOCK_DGRAM, IPPROTO_UDP);
141 215
142 if (udpv4_fd < 0) 216 if (udpv4_fd < 0)
143 return -1; 217 return -1;
144
145 fcntl (udpv4_fd, F_SETFL, O_NONBLOCK);
146 fcntl (udpv4_fd, F_SETFD, FD_CLOEXEC);
147 218
148 // standard daemon practise... 219 // standard daemon practise...
149 { 220 {
150 int oval = 1; 221 int oval = 1;
151 setsockopt (udpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval); 222 setsockopt (udpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);
… …
163 234
164 sockinfo si (THISNODE, PROT_UDPv4); 235 sockinfo si (THISNODE, PROT_UDPv4);
165 236
166 if (bind (udpv4_fd, si.sav4 (), si.salenv4 ())) 237 if (bind (udpv4_fd, si.sav4 (), si.salenv4 ()))
167 { 238 {
168 slog (L_ERR, _("can't bind udpv4 on %s: %s"), (const char *)si, strerror (errno)); 239 slog (L_ERR, _("can't bind udpv4 on %s: %s, exiting."), (const char *)si, strerror (errno));
169 exit (EXIT_FAILURE); 240 return -1;
170 } 241 }
171 242
172 udpv4_ev_watcher.start (udpv4_fd, EV_READ); 243 udpv4_ev_watcher.start (udpv4_fd, EV_READ);
244 ++success;
173 } 245 }
246 else
247 THISNODE->protocols &= ~PROT_UDPv4;
174 248
249 icmpv4_tos = -1;
175 icmpv4_fd = -1; 250 icmpv4_fd = -1;
176 251
177#if ENABLE_ICMP 252#if ENABLE_ICMP
178 if (THISNODE->protocols & PROT_ICMPv4) 253 if (THISNODE->protocols & PROT_ICMPv4)
179 { 254 {
180 icmpv4_fd = socket (PF_INET, SOCK_RAW, IPPROTO_ICMP); 255 icmpv4_fd = setup_socket (PROT_ICMPv4, PF_INET, SOCK_RAW, IPPROTO_ICMP);
181 256
182 if (icmpv4_fd < 0) 257 if (icmpv4_fd < 0)
183 return -1; 258 return -1;
184 259
185 fcntl (icmpv4_fd, F_SETFL, O_NONBLOCK); 260// no clue where trhis is actually defined
186 fcntl (icmpv4_fd, F_SETFD, FD_CLOEXEC); 261#if !defined(ICMP_FILTER) && defined(__linux)
262 #define ICMP_FILTER 1
263#endif
187 264
188#ifdef ICMP_FILTER 265#ifdef ICMP_FILTER
189 { 266 {
190 icmp_filter oval; 267 uint32_t oval;
191 oval.data = 0xffffffff; 268 oval = 0;
192 if (::conf.icmp_type < 32) 269 if (::conf.icmp_type < 32)
193 oval.data &= ~(1 << ::conf.icmp_type); 270 oval |= 1 << ::conf.icmp_type;
271 oval = ~oval;
194 272
195 setsockopt (icmpv4_fd, SOL_RAW, ICMP_FILTER, &oval, sizeof oval); 273 setsockopt (icmpv4_fd, SOL_RAW, ICMP_FILTER, &oval, sizeof oval);
196 } 274 }
197#endif 275#endif
198 276
… …
208 286
209 sockinfo si (THISNODE, PROT_ICMPv4); 287 sockinfo si (THISNODE, PROT_ICMPv4);
210 288
211 if (bind (icmpv4_fd, si.sav4 (), si.salenv4 ())) 289 if (bind (icmpv4_fd, si.sav4 (), si.salenv4 ()))
212 { 290 {
213 slog (L_ERR, _("can't bind icmpv4 on %s: %s"), (const char *)si, strerror (errno)); 291 slog (L_ERR, _("can't bind icmpv4 on %s: %s, exiting."), (const char *)si, strerror (errno));
214 exit (EXIT_FAILURE); 292 return -1;
215 } 293 }
216 294
217 icmpv4_ev_watcher.start (icmpv4_fd, EV_READ); 295 icmpv4_ev_watcher.start (icmpv4_fd, EV_READ);
296 ++success;
218 } 297 }
219#endif 298#endif
220 299
221 tcpv4_fd = -1; 300 tcpv4_fd = -1;
222 301
223#if ENABLE_TCP 302#if ENABLE_TCP
224 if (THISNODE->protocols & PROT_TCPv4 && THISNODE->tcp_port) 303 if (THISNODE->protocols & PROT_TCPv4 && THISNODE->tcp_port)
225 { 304 {
226 tcpv4_fd = socket (PF_INET, SOCK_STREAM, IPPROTO_TCP); 305 tcpv4_fd = setup_socket (PROT_TCPv4, PF_INET, SOCK_STREAM, IPPROTO_TCP);
227 306
228 if (tcpv4_fd < 0) 307 if (tcpv4_fd < 0)
229 return -1; 308 return -1;
230 309
231 fcntl (tcpv4_fd, F_SETFL, O_NONBLOCK);
232 fcntl (tcpv4_fd, F_SETFD, FD_CLOEXEC);
233
234 // standard daemon practise... 310 // standard daemon practise...
235 { 311 {
236 int oval = 1; 312 int oval = 1;
237 setsockopt (tcpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval); 313 setsockopt (tcpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);
238 } 314 }
239 315
240 sockinfo si (THISNODE, PROT_TCPv4); 316 sockinfo si (THISNODE, PROT_TCPv4);
241 317
242 if (bind (tcpv4_fd, si.sav4 (), si.salenv4 ())) 318 if (bind (tcpv4_fd, si.sav4 (), si.salenv4 ()))
243 { 319 {
244 slog (L_ERR, _("can't bind tcpv4 on %s: %s"), (const char *)si, strerror (errno)); 320 slog (L_ERR, _("can't bind tcpv4 on %s: %s, exiting."), (const char *)si, strerror (errno));
245 exit (EXIT_FAILURE); 321 return -1;
246 } 322 }
247 323
248 if (listen (tcpv4_fd, 5)) 324 if (listen (tcpv4_fd, 5))
249 { 325 {
250 slog (L_ERR, _("can't listen tcpv4 on %s: %s"), (const char *)si, strerror (errno)); 326 slog (L_ERR, _("can't listen tcpv4 on %s: %s, exiting."), (const char *)si, strerror (errno));
251 exit (EXIT_FAILURE); 327 return -1;
252 } 328 }
253 329
254 tcpv4_ev_watcher.start (tcpv4_fd, EV_READ); 330 tcpv4_ev_watcher.start (tcpv4_fd, EV_READ);
331 ++success;
255 } 332 }
333 else
334 THISNODE->protocols &= ~PROT_TCPv4;
256#endif 335#endif
336
337 dnsv4_tos = -1;
338 dnsv4_fd = -1;
257 339
258#if ENABLE_DNS 340#if ENABLE_DNS
259 if (THISNODE->protocols & PROT_DNSv4) 341 if (THISNODE->protocols & PROT_DNSv4)
260 { 342 {
261 dns_forwarder.set (::conf.dns_forw_host, ::conf.dns_forw_port, PROT_DNSv4); 343 dns_forwarder.set (::conf.dns_forw_host, ::conf.dns_forw_port, PROT_DNSv4);
262 344
263 dnsv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP); 345 dnsv4_fd = setup_socket (PROT_DNSv4, PF_INET, SOCK_DGRAM, IPPROTO_UDP);
264 346
265 if (dnsv4_fd < 0) 347 if (dnsv4_fd < 0)
266 return -1; 348 return -1;
267
268 fcntl (dnsv4_fd, F_SETFL, O_NONBLOCK);
269 fcntl (dnsv4_fd, F_SETFD, FD_CLOEXEC);
270 349
271# if defined(SOL_IP) && defined(IP_MTU_DISCOVER) 350# if defined(SOL_IP) && defined(IP_MTU_DISCOVER)
272 // this I really consider a linux bug. I am neither connected 351 // this I really consider a linux bug. I am neither connected
273 // nor do I fragment myself. Linux still sets DF and doesn't 352 // nor do I fragment myself. Linux still sets DF and doesn't
274 // fragment for me sometimes. 353 // fragment for me sometimes.
… …
288 THISNODE->dns_hostname ? THISNODE->dns_port : 0, 367 THISNODE->dns_hostname ? THISNODE->dns_port : 0,
289 PROT_DNSv4); 368 PROT_DNSv4);
290 369
291 if (bind (dnsv4_fd, si.sav4 (), si.salenv4 ())) 370 if (bind (dnsv4_fd, si.sav4 (), si.salenv4 ()))
292 { 371 {
293 slog (L_ERR, _("can't bind dnsv4 on %s: %s"), (const char *)si, strerror (errno)); 372 slog (L_ERR, _("can't bind dnsv4 on %s: %s, exiting."), (const char *)si, strerror (errno));
294 exit (EXIT_FAILURE); 373 return -1;
295 } 374 }
296 375
297 dnsv4_ev_watcher.start (dnsv4_fd, EV_READ); 376 dnsv4_ev_watcher.start (dnsv4_fd, EV_READ);
377 ++success;
298 } 378 }
299#endif 379#endif
300 380
301 ///////////////////////////////////////////////////////////////////////////// 381 /////////////////////////////////////////////////////////////////////////////
382
383 if (!success)
384 {
385 slog (L_ERR, _("no protocols enabled."));
386 return -1;
387 }
302 388
303 reconnect_all (); 389 reconnect_all ();
304 390
305 ///////////////////////////////////////////////////////////////////////////// 391 /////////////////////////////////////////////////////////////////////////////
306 392
307 tap = new tap_device (); 393 tap = new tap_device ();
308 if (!tap) //D this, of course, never catches 394 if (!tap) //D this, of course, never catches
309 { 395 {
310 slog (L_ERR, _("cannot create network interface '%s'"), conf.ifname); 396 slog (L_ERR, _("cannot create network interface '%s'."), conf.ifname);
311 exit (EXIT_FAILURE); 397 return -1;
312 } 398 }
313 399
314 fcntl (tap->fd, F_SETFD, FD_CLOEXEC); 400 fcntl (tap->fd, F_SETFD, FD_CLOEXEC);
315 401
402 run_script_cb cb;
403 cb.set<vpn, &vpn::script_if_init> (this);
404
316 if (tap->if_up () && 405 if (tap->if_up () &&
317 !run_script (run_script_cb (this, &vpn::script_if_init), true)) 406 !run_script (cb, true))
318 { 407 {
319 slog (L_ERR, _("interface initialization command '%s' failed, exiting."), 408 slog (L_ERR, _("interface initialization command '%s' failed."),
320 tap->if_up ()); 409 tap->if_up ());
321 exit (EXIT_FAILURE); 410 return -1;
322 }
323
324 if (!run_script (run_script_cb (this, &vpn::script_if_up), true))
325 { 411 }
412
413 cb.set<vpn, &vpn::script_if_up> (this);
414 if (!run_script (cb, true))
415 {
326 slog (L_ERR, _("if-up command execution failed, exiting.")); 416 slog (L_ERR, _("if-up command execution failed."));
327 exit (EXIT_FAILURE); 417 return -1;
328 } 418 }
329 419
330 tap_ev_watcher.start (tap->fd, EV_READ); 420 tap_ev_watcher.start (tap->fd, EV_READ);
331 421
332 return 0; 422 return 0;
423}
424
425bool
426vpn::drop_privileges ()
427{
428 if (::conf.change_root)
429 {
430 if (!strcmp (::conf.change_root, "/"))
431 {
432 char dir [L_tmpnam];
433 if (!tmpnam (dir))
434 {
435 slog (L_CRIT, _("unable to create anonymous root path."));
436 return false;
437 }
438
439 if (mkdir (dir, 0700))
440 {
441 slog (L_CRIT, _("unable to create anonymous root directory."));
442 return false;
443 }
444
445 if (chdir (dir))
446 {
447 slog (L_CRIT, _("unable to change to anonymous root directory."));
448 return false;
449 }
450
451 if (rmdir (dir))
452 slog (L_ERR, _("unable to remove anonymous root directory, continuing."));
453 }
454 else
455 {
456 if (chdir (::conf.change_root))
457 {
458 slog (L_CRIT, _("%s: unable to change to specified root directory."), ::conf.change_root);
459 return false;
460 }
461 }
462
463 if (chroot ("."))
464 {
465 slog (L_CRIT, _("unable to set new root directory."));
466 return false;
467 }
468
469 if (chdir ("/"))
470 {
471 slog (L_CRIT, _("unable to set cwd to new root directory."));
472 return false;
473 }
474 }
475
476 if (::conf.change_gid)
477 if (setgid (::conf.change_gid))
478 {
479 slog (L_CRIT, _("unable to change group id to %d."), ::conf.change_gid);
480 return false;
481 }
482
483 if (::conf.change_uid)
484 if (setuid (::conf.change_uid))
485 {
486 slog (L_CRIT, _("unable to change user id to %d."), ::conf.change_uid);
487 return false;
488 }
489
490 return true;
333} 491}
334 492
335bool 493bool
336vpn::send_ipv4_packet (vpn_packet *pkt, const sockinfo &si, int tos) 494vpn::send_ipv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)
337{ 495{
338#if defined(SOL_IP) && defined(IP_TOS) 496 set_tos (ipv4_fd, ipv4_tos, tos);
339 setsockopt (ipv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);
340#endif
341 sendto (ipv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ()); 497 xsendto (ipv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());
342 498
343 return true; 499 return true;
344} 500}
345 501
346static u16 502static u16
… …
368 524
369#if ENABLE_ICMP 525#if ENABLE_ICMP
370bool 526bool
371vpn::send_icmpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos) 527vpn::send_icmpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)
372{ 528{
373#if defined(SOL_IP) && defined(IP_TOS)
374 setsockopt (icmpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);
375#endif
376
377 pkt->unshift_hdr (4); 529 pkt->unshift_hdr (4);
378 530
379 icmp_header *hdr = (icmp_header *)&((*pkt)[0]); 531 icmp_header *hdr = (icmp_header *)&((*pkt)[0]);
380 hdr->type = ::conf.icmp_type; 532 hdr->type = ::conf.icmp_type;
381 hdr->code = 255; 533 hdr->code = 255;
382 hdr->checksum = 0; 534 hdr->checksum = 0;
383 hdr->checksum = ipv4_checksum ((u16 *)hdr, pkt->len); 535 hdr->checksum = ipv4_checksum ((u16 *)hdr, pkt->len);
384 536
537 set_tos (icmpv4_fd, icmpv4_tos, tos);
385 sendto (icmpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ()); 538 xsendto (icmpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());
386 539
387 return true; 540 return true;
388} 541}
389#endif 542#endif
390 543
391bool 544bool
392vpn::send_udpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos) 545vpn::send_udpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)
393{ 546{
394#if defined(SOL_IP) && defined(IP_TOS) 547 set_tos (udpv4_fd, udpv4_tos, tos);
395 setsockopt (udpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);
396#endif
397 sendto (udpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ()); 548 xsendto (udpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());
398 549
399 return true; 550 return true;
400} 551}
401 552
402void 553void
… …
412 { 563 {
413 // broadcast, this is ugly, but due to the security policy 564 // broadcast, this is ugly, but due to the security policy
414 // we have to connect to all hosts... 565 // we have to connect to all hosts...
415 for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c) 566 for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)
416 if ((*c)->conf != THISNODE) 567 if ((*c)->conf != THISNODE)
417 (*c)->inject_data_packet (pkt, true); 568 (*c)->inject_data_packet (pkt);
418 } 569 }
419} 570}
420 571
421void 572void
422vpn::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi) 573vpn::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)
423{ 574{
424 unsigned int src = pkt->src (); 575 unsigned int src = pkt->src ();
425 unsigned int dst = pkt->dst (); 576 unsigned int dst = pkt->dst ();
426 577
427 slog (L_NOISE, _("<<?/%s received possible vpn packet type %d from %d to %d, length %d"), 578 slog (L_NOISE, _("<<?/%s received possible vpn packet type %d from %d to %d, length %d."),
428 (const char *)rsi, pkt->typ (), pkt->src (), pkt->dst (), pkt->len); 579 (const char *)rsi, pkt->typ (), pkt->src (), pkt->dst (), pkt->len);
429 580
430 if (src == 0 || src > conns.size () 581 if (src == 0 || src > conns.size ()
431 || dst > conns.size () 582 || dst > conns.size ()
432 || pkt->typ () >= vpn_packet::PT_MAX) 583 || pkt->typ () >= vpn_packet::PT_MAX)
433 slog (L_WARN, _("(%s): received corrupted packet type %d (src %d, dst %d)"), 584 slog (L_WARN, _("(%s): received corrupted packet type %d (src %d, dst %d)."),
434 (const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ());
435 else if (dst > conns.size ())
436 slog (L_WARN, _("(%s): received corrupted packet type %d (src %d, dst %d)"),
437 (const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ()); 585 (const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ());
438 else 586 else
439 { 587 {
440 connection *c = conns[src - 1]; 588 connection *c = conns[src - 1];
441 589
442 if (dst == 0) 590 if (dst == 0)
443 slog (L_WARN, _("%s(%s): received broadcast (protocol violation)"), 591 slog (L_WARN, _("%s(%s): received broadcast (protocol violation)."),
444 c->conf->nodename, (const char *)rsi); 592 c->conf->nodename, (const char *)rsi);
445 else if (dst != THISNODE->id) 593 else if (dst != THISNODE->id)
446 { 594 {
447 if (THISNODE->routerprio) 595 if (THISNODE->routerprio)
448 // the tos setting gets lost here. who cares. 596 // the tos setting gets lost here. who cares.
449 conns[dst - 1]->inject_vpn_packet (pkt); 597 conns[dst - 1]->inject_vpn_packet (pkt);
450 else 598 else
451 slog (L_WARN, 599 slog (L_WARN,
452 _("%s(%s): forwarding request (=> %s), but we are no router"), 600 _("%s(%s): request to forward packet to %s, but we are no router (config mismatch?)."),
453 c->conf->nodename, (const char *)rsi, 601 c->conf->nodename, (const char *)rsi,
454 conns[dst - 1]->conf->nodename); 602 conns[dst - 1]->conf->nodename);
455 } 603 }
456 else 604 else
457 c->recv_vpn_packet (pkt, rsi); 605 c->recv_vpn_packet (pkt, rsi);
… …
462vpn::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos) 610vpn::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos)
463{ 611{
464 switch (si.prot) 612 switch (si.prot)
465 { 613 {
466 case PROT_IPv4: 614 case PROT_IPv4:
467 return send_ipv4_packet (pkt, si, tos); 615 return send_ipv4_packet (pkt, si, tos);
616
468 case PROT_UDPv4: 617 case PROT_UDPv4:
469 return send_udpv4_packet (pkt, si, tos); 618 return send_udpv4_packet (pkt, si, tos);
619
470#if ENABLE_TCP 620#if ENABLE_TCP
471 case PROT_TCPv4: 621 case PROT_TCPv4:
472 return send_tcpv4_packet (pkt, si, tos); 622 return send_tcpv4_packet (pkt, si, tos);
473#endif 623#endif
474#if ENABLE_ICMP 624#if ENABLE_ICMP
475 case PROT_ICMPv4: 625 case PROT_ICMPv4:
476 return send_icmpv4_packet (pkt, si, tos); 626 return send_icmpv4_packet (pkt, si, tos);
477#endif 627#endif
478#if ENABLE_DNS 628#if ENABLE_DNS
479 case PROT_DNSv4: 629 case PROT_DNSv4:
480 return send_dnsv4_packet (pkt, si, tos); 630 return send_dnsv4_packet (pkt, si, tos);
481#endif 631#endif
482
483 default: 632 default:
484 slog (L_CRIT, _("%s: FATAL: trying to send packet with unsupported protocol"), (const char *)si); 633 slog (L_CRIT, _("%s: FATAL: trying to send packet with unsupported protocol."), (const char *)si);
485 } 634 }
486 635
487 return false; 636 return false;
488} 637}
489 638
490void 639inline void
491vpn::ipv4_ev (ev::io &w, int revents) 640vpn::ipv4_ev (ev::io &w, int revents)
492{ 641{
493 if (revents & EV_READ) 642 if (revents & EV_READ)
494 { 643 {
495 vpn_packet *pkt = new vpn_packet; 644 vpn_packet *pkt = new vpn_packet;
… …
504 if (len > 0) 653 if (len > 0)
505 { 654 {
506 pkt->len = len; 655 pkt->len = len;
507 656
508 // raw sockets deliver the ipv4 header, but don't expect it on sends 657 // raw sockets deliver the ipv4 header, but don't expect it on sends
509 pkt->skip_hdr (IP_OVERHEAD); 658 pkt->skip_hdr (pkt->ipv4_hdr_len ());
510 659
511 recv_vpn_packet (pkt, si); 660 recv_vpn_packet (pkt, si);
512 } 661 }
513 else 662 else
514 { 663 {
515 // probably ECONNRESET or somesuch 664 // probably ECONNRESET or somesuch
516 slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno)); 665 slog (L_DEBUG, _("%s: %s."), (const char *)si, strerror (errno));
517 } 666 }
518 667
519 delete pkt; 668 delete pkt;
520 } 669 }
521 else 670 else
522 { 671 {
523 slog (L_ERR, 672 slog (L_ERR,
524 _("FATAL: unknown revents %08x in socket, terminating\n"), 673 _("FATAL: unknown revents %08x in socket, exiting.\n"),
525 revents); 674 revents);
526 exit (EXIT_FAILURE); 675 exit (EXIT_FAILURE);
527 } 676 }
528} 677}
529 678
530#if ENABLE_ICMP 679#if ENABLE_ICMP
531void 680inline void
532vpn::icmpv4_ev (ev::io &w, int revents) 681vpn::icmpv4_ev (ev::io &w, int revents)
533{ 682{
534 if (revents & EV_READ) 683 if (revents & EV_READ)
535 { 684 {
536 vpn_packet *pkt = new vpn_packet; 685 vpn_packet *pkt = new vpn_packet;
… …
551 if (hdr->type == ::conf.icmp_type 700 if (hdr->type == ::conf.icmp_type
552 && hdr->code == 255) 701 && hdr->code == 255)
553 { 702 {
554 // raw sockets deliver the ipv4, but don't expect it on sends 703 // raw sockets deliver the ipv4, but don't expect it on sends
555 // this is slow, but... 704 // this is slow, but...
556 pkt->skip_hdr (ICMP_OVERHEAD); 705 pkt->skip_hdr (pkt->ipv4_hdr_len () + (ICMP_OVERHEAD - IP_OVERHEAD));
557 706
558 recv_vpn_packet (pkt, si); 707 recv_vpn_packet (pkt, si);
559 } 708 }
560 } 709 }
561 else 710 else
562 { 711 {
563 // probably ECONNRESET or somesuch 712 // probably ECONNRESET or somesuch
564 slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno)); 713 slog (L_DEBUG, _("%s: %s."), (const char *)si, strerror (errno));
565 } 714 }
566 715
567 delete pkt; 716 delete pkt;
568 } 717 }
569 else 718 else
570 { 719 {
571 slog (L_ERR, 720 slog (L_ERR,
572 _("FATAL: unknown revents %08x in socket, terminating\n"), 721 _("FATAL: unknown revents %08x in socket, exiting.\n"),
573 revents); 722 revents);
574 exit (EXIT_FAILURE); 723 exit (EXIT_FAILURE);
575 } 724 }
576} 725}
577#endif 726#endif
578 727
579void 728inline void
580vpn::udpv4_ev (ev::io &w, int revents) 729vpn::udpv4_ev (ev::io &w, int revents)
581{ 730{
582 if (revents & EV_READ) 731 if (revents & EV_READ)
583 { 732 {
584 vpn_packet *pkt = new vpn_packet; 733 vpn_packet *pkt = new vpn_packet;
… …
597 recv_vpn_packet (pkt, si); 746 recv_vpn_packet (pkt, si);
598 } 747 }
599 else 748 else
600 { 749 {
601 // probably ECONNRESET or somesuch 750 // probably ECONNRESET or somesuch
602 slog (L_DEBUG, _("%s: fd %d, %s"), (const char *)si, w.fd, strerror (errno)); 751 slog (L_DEBUG, _("%s: fd %d, %s."), (const char *)si, w.fd, strerror (errno));
603 } 752 }
604 753
605 delete pkt; 754 delete pkt;
606 } 755 }
607 else 756 else
608 { 757 {
609 slog (L_ERR, 758 slog (L_ERR,
610 _("FATAL: unknown revents %08x in socket, terminating\n"), 759 _("FATAL: unknown revents %08x in socket, exiting.\n"),
611 revents); 760 revents);
612 exit (EXIT_FAILURE); 761 exit (EXIT_FAILURE);
613 } 762 }
614} 763}
615 764
616void 765inline void
617vpn::tap_ev (ev::io &w, int revents) 766vpn::tap_ev (ev::io &w, int revents)
618{ 767{
619 if (revents & EV_READ) 768 if (revents & EV_READ)
620 { 769 {
621 /* process data */ 770 /* process data */
… …
653 } 802 }
654 else 803 else
655 abort (); 804 abort ();
656} 805}
657 806
658void 807inline void
659vpn::event_cb (ev::timer &w, int) 808vpn::event_cb (ev::timer &w, int)
660{ 809{
661 if (events) 810 if (events)
662 { 811 {
663 if (events & EVENT_SHUTDOWN) 812 if (events & EVENT_SHUTDOWN)
664 { 813 {
665 slog (L_INFO, _("preparing shutdown...")); 814 slog (L_INFO, _("preparing shutdown..."));
666 815
667 shutdown_all (); 816 shutdown_all ();
668 remove_pid (conf.pidfilename); 817 remove_pid (conf.pidfilename);
669 slog (L_INFO, _("terminating")); 818 slog (L_INFO, _("exiting."));
670 exit (EXIT_SUCCESS); 819 exit (EXIT_SUCCESS);
671 } 820 }
672 821
673 if (events & EVENT_RECONNECT) 822 if (events & EVENT_RECONNECT)
674 { 823 {
675 slog (L_INFO, _("forced reconnect")); 824 slog (L_INFO, _("forced reconnect."));
676 825
677 reconnect_all (); 826 reconnect_all ();
678 } 827 }
679 828
680 events = 0; 829 events = 0;
… …
696 845
697 conns.clear (); 846 conns.clear ();
698 847
699 connection_init (); 848 connection_init ();
700 849
701 for (configuration::node_vector::iterator i = conf.nodes.begin (); 850 for (configuration::node_vector::iterator i = conf.nodes.begin (); i != conf.nodes.end (); ++i)
702 i != conf.nodes.end (); ++i) 851 conns.push_back (new connection (this, *i));
703 { 852
704 connection *conn = new connection (this, *i); 853 for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)
705 conns.push_back (conn);
706 conn->establish_connection (); 854 (*c)->establish_connection ();
707 }
708} 855}
709 856
710connection *vpn::find_router () 857bool
858vpn::can_direct (conf_node *src, conf_node *dst) const
711{ 859{
712 u32 prio = 1; 860 return src != dst
861 && src->may_direct (dst)
862 && dst->may_direct (src)
863 && (((src->protocols & dst->protocols) && src->connectmode == conf_node::C_ALWAYS)
864 || (src->protocols & dst->connectable_protocols ()));
865}
866
867// only works for indirect and routed connections: find a router
868// from THISNODE to dst
869connection *
870vpn::find_router_for (const connection *dst)
871{
713 connection *router = 0; 872 connection *router = 0;
714 873
874 // first try to find a router with a direct connection, route there
875 // regardless of any other considerations.
876 {
877 u32 prio = 1;
878
879 for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)
880 {
881 connection *c = *i;
882
883 if (c->conf->routerprio > prio
884 && c->conf != THISNODE
885 && can_direct (c->conf, dst->conf)
886 && c->ictx && c->octx)
887 {
888 prio = c->conf->routerprio;
889 router = c;
890 }
891 }
892 }
893
894 if (router)
895 return router;
896
897 // second try find the router with the highest priority, higher than ours
898 {
899 u32 prio = THISNODE->routerprio ? THISNODE->routerprio : 1;
900
901 for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)
902 {
903 connection *c = *i;
904
905 if (c->conf->routerprio > prio
906 && c != dst
907 && c->conf != THISNODE
908 && c->ictx && c->octx)
909 {
910 prio = c->conf->routerprio;
911 router = c;
912 }
913 }
914 }
915
916 return router;
917}
918
919void
920vpn::connection_established (connection *c)
921{
715 for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i) 922 for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)
716 { 923 {
717 connection *c = *i; 924 connection *o = *i;
718 925
719 if (c->conf->routerprio > prio 926 if (o->si.valid ()
720 && c->connectmode == conf_node::C_ALWAYS // so we don't drop the connection if in use 927 && c->si != o->si
721 && c->ictx && c->octx 928 && c == find_router_for (o)
722 && c->conf != THISNODE) // redundant, since ictx==octx==0 always on thisnode 929 && !can_direct (THISNODE, o->conf))
723 {
724 prio = c->conf->routerprio;
725 router = c;
726 } 930 {
931 slog (L_DEBUG, _("%s: can now route packets via %s, re-keying connection."),
932 o->conf->nodename, c->conf->nodename);
933 o->rekey ();
934 }
727 } 935 }
728
729 return router;
730} 936}
731 937
938void
732void vpn::send_connect_request (int id) 939vpn::send_connect_request (connection *c)
733{ 940{
734 connection *c = find_router (); 941 connection *r = find_router_for (c);
735 942
736 if (c) 943 if (r)
944 {
945 slog (L_TRACE, _("%s: no address known, sending mediated connection request via %s."),
946 c->conf->nodename, r->conf->nodename);
737 c->send_connect_request (id); 947 r->send_connect_request (c->conf->id);
948 }
738 else 949 else
739 // no router found, aggressively connect to all routers 950 slog (L_DEBUG, _("%s: no way to connect and no router found: unable to connect at this time."),
740 for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i) 951 c->conf->nodename);
741 if ((*i)->conf->routerprio && (*i)->conf != THISNODE)
742 (*i)->establish_connection ();
743} 952}
744 953
745void 954void
746connection::dump_status () 955connection::dump_status ()
747{ 956{
748 slog (L_NOTICE, _("node %s (id %d)"), conf->nodename, conf->id); 957 slog (L_NOTICE, _("node %s (id %d)"), conf->nodename, conf->id);
749 slog (L_NOTICE, _(" connectmode %d (%d) / sockaddr %s / minor %d"), 958 slog (L_NOTICE, _(" connectmode %d (%d) / sockaddr %s / minor %d"),
750 connectmode, conf->connectmode, (const char *)si, (int)prot_minor); 959 connectmode, conf->connectmode, (const char *)si, (int)prot_minor);
751 slog (L_NOTICE, _(" ictx/octx %08lx/%08lx / oseqno %d / retry_cnt %d"), 960 slog (L_NOTICE, _(" ictx/octx %08lx/%08lx / oseqno %d / retry_cnt %d"),
752 (long)ictx, (long)octx, (int)oseqno, (int)retry_cnt); 961 (long)ictx, (long)octx, (int)oseqno, (int)retry_cnt);
753 slog (L_NOTICE, _(" establish_conn %ld / rekey %ld / keepalive %ld"),
754 (long)(establish_connection.at), (long)(rekey.at), (long)(keepalive.at));
755} 962}
756 963
757void 964void
758vpn::dump_status () 965vpn::dump_status ()
759{ 966{
760 slog (L_NOTICE, _("BEGIN status dump (%ld)"), (long)ev::ev_now ()); 967 slog (L_NOTICE, _("BEGIN status dump (%ld)"), (long)ev_now ());
761 968
762 for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c) 969 for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)
763 (*c)->dump_status (); 970 (*c)->dump_status ();
764 971
765 slog (L_NOTICE, _("END status dump")); 972 slog (L_NOTICE, _("END status dump"));
766} 973}
767 974
768vpn::vpn (void) 975vpn::vpn (void)
976{
769: event (this, &vpn::event_cb) 977 event .set<vpn, &vpn::event_cb > (this);
770, udpv4_ev_watcher (this, &vpn::udpv4_ev) 978 udpv4_ev_watcher .set<vpn, &vpn::udpv4_ev > (this);
771, ipv4_ev_watcher (this, &vpn::ipv4_ev) 979 ipv4_ev_watcher .set<vpn, &vpn::ipv4_ev > (this);
772#if ENABLE_TCP 980#if ENABLE_TCP
773, tcpv4_ev_watcher (this, &vpn::tcpv4_ev) 981 tcpv4_ev_watcher .set<vpn, &vpn::tcpv4_ev > (this);
774#endif 982#endif
775#if ENABLE_ICMP 983#if ENABLE_ICMP
776, icmpv4_ev_watcher(this, &vpn::icmpv4_ev) 984 icmpv4_ev_watcher.set<vpn, &vpn::icmpv4_ev> (this);
777#endif 985#endif
778#if ENABLE_DNS 986#if ENABLE_DNS
779, dnsv4_ev_watcher (this, &vpn::dnsv4_ev) 987 dnsv4_ev_watcher .set<vpn, &vpn::dnsv4_ev > (this);
780#endif 988#endif
781, tap_ev_watcher (this, &vpn::tap_ev) 989 tap_ev_watcher .set<vpn, &vpn::tap_ev > (this);
782{
783} 990}
784 991
785vpn::~vpn () 992vpn::~vpn ()
786{ 993{
787} 994}

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