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Comparing gvpe/src/vpn.C (file contents):
Revision 1.24 by pcg, Fri Apr 2 14:42:45 2004 UTC vs.
Revision 1.35 by pcg, Fri Apr 8 16:12:49 2005 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) 2003-2005 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
6 it under the terms of the GNU General Public License as published by 8 it under the terms of the GNU General Public License as published by
7 the Free Software Foundation; either version 2 of the License, or 9 the Free Software Foundation; either version 2 of the License, or
8 (at your option) any later version. 10 (at your 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,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of 13 but 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
13 GNU General Public License for more details. 15 GNU General 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
16 along with this program; if not, write to the Free Software 18 along with gvpe; if not, write to the Free Software
17 Foundation, Inc. 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 19 Foundation, Inc. 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
18*/ 20*/
19 21
20#include "config.h" 22#include "config.h"
21 23
… …
44 46
45vpn network; // THE vpn (bad design...) 47vpn network; // THE vpn (bad design...)
46 48
47///////////////////////////////////////////////////////////////////////////// 49/////////////////////////////////////////////////////////////////////////////
48 50
49const char *vpn::script_if_up () 51void
52vpn::script_init_env ()
50{ 53{
51 // the tunnel device mtu should be the physical mtu - overhead 54 // the tunnel device mtu should be the physical mtu - overhead
52 // the tricky part is rounding to the cipher key blocksize 55 // the tricky part is rounding to the cipher key blocksize
53 int mtu = conf.mtu - ETH_OVERHEAD - VPE_OVERHEAD - MAX_OVERHEAD; 56 int mtu = conf.mtu - ETH_OVERHEAD - VPE_OVERHEAD - MAX_OVERHEAD;
54 mtu += ETH_OVERHEAD - 6 - 6; // now we have the data portion 57 mtu += ETH_OVERHEAD - 6 - 6; // now we have the data portion
55 mtu -= mtu % EVP_CIPHER_block_size (CIPHER); // round 58 mtu -= mtu % EVP_CIPHER_block_size (CIPHER); // round
56 mtu -= ETH_OVERHEAD - 6 - 6; // and get interface mtu again 59 mtu -= ETH_OVERHEAD - 6 - 6; // and get interface mtu again
57 60
58 char *env; 61 char *env;
59 asprintf (&env, "CONFBASE=%s", confbase); putenv (env); 62 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); 63 asprintf (&env, "IFNAME=%s", tap->interface ()); putenv (env);
63 asprintf (&env, "IFTYPE=%s", IFTYPE); putenv (env); 64 asprintf (&env, "IFTYPE=%s", IFTYPE); putenv (env);
64 asprintf (&env, "IFSUBTYPE=%s", IFSUBTYPE); putenv (env); 65 asprintf (&env, "IFSUBTYPE=%s", IFSUBTYPE); putenv (env);
65 asprintf (&env, "MTU=%d", mtu); putenv (env); 66 asprintf (&env, "MTU=%d", mtu); putenv (env);
66 asprintf (&env, "MAC=%02x:%02x:%02x:%02x:%02x:%02x", 67 asprintf (&env, "NODES=%d", conns.size ()); putenv (env);
67 0xfe, 0xfd, 0x80, 0x00, THISNODE->id >> 8, 68 asprintf (&env, "NODEID=%d", THISNODE->id); putenv (env);
68 THISNODE->id & 0xff);
69 putenv (env);
70 69
70 conns [THISNODE->id - 1]->script_init_env ("");
71
72 for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)
73 {
74 char ext[16];
75 snprintf (ext, 16, "_%d", (*c)->conf->id);
76 (*c)->script_init_env (ext);
77 }
78}
79
80const char *vpn::script_if_init ()
81{
82 script_init_env ();
83
84 return tap->if_up ();
85}
86
87const char *vpn::script_if_up ()
88{
89 script_init_env ();
90
91 char *filename;
92 asprintf (&filename,
93 "%s/%s",
94 confbase,
71 return ::conf.script_if_up ? ::conf.script_if_up : "if-up"; 95 ::conf.script_if_up ? ::conf.script_if_up : "if-up");
96
97 return filename;
72} 98}
73 99
74int 100int
75vpn::setup () 101vpn::setup ()
76{ 102{
… …
226#endif 252#endif
227 253
228#if ENABLE_DNS 254#if ENABLE_DNS
229 if (THISNODE->protocols & PROT_DNSv4) 255 if (THISNODE->protocols & PROT_DNSv4)
230 { 256 {
257 dns_forwarder.set (::conf.dns_forw_host, ::conf.dns_forw_port, PROT_DNSv4);
258
231 dnsv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP); 259 dnsv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP);
232 260
233 if (dnsv4_fd < 0) 261 if (dnsv4_fd < 0)
234 return -1; 262 return -1;
263
264# if defined(SOL_IP) && defined(IP_MTU_DISCOVER)
265 // this I really consider a linux bug. I am neither connected
266 // nor do I fragment myself. Linux still sets DF and doesn't
267 // fragment for me sometimes.
268 {
269 int oval = IP_PMTUDISC_DONT;
270 setsockopt (dnsv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);
271 }
272# endif
235 273
236 // standard daemon practise... 274 // standard daemon practise...
237 { 275 {
238 int oval = 1; 276 int oval = 1;
239 setsockopt (tcpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval); 277 setsockopt (dnsv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);
240 } 278 }
241 279
242 sockinfo si (THISNODE, PROT_DNSv4); 280 sockinfo si (THISNODE->dns_hostname,
281 THISNODE->dns_hostname ? THISNODE->dns_port : 0,
282 PROT_DNSv4);
243 283
244 if (bind (dnsv4_fd, si.sav4 (), si.salenv4 ())) 284 if (bind (dnsv4_fd, si.sav4 (), si.salenv4 ()))
245 { 285 {
246 slog (L_ERR, _("can't bind dnsv4 on %s: %s"), (const char *)si, strerror (errno)); 286 slog (L_ERR, _("can't bind dnsv4 on %s: %s"), (const char *)si, strerror (errno));
247 exit (EXIT_FAILURE); 287 exit (EXIT_FAILURE);
… …
249 289
250 dnsv4_ev_watcher.start (dnsv4_fd, EVENT_READ); 290 dnsv4_ev_watcher.start (dnsv4_fd, EVENT_READ);
251 } 291 }
252#endif 292#endif
253 293
294 /////////////////////////////////////////////////////////////////////////////
295
296 reconnect_all ();
297
298 /////////////////////////////////////////////////////////////////////////////
299
254 tap = new tap_device (); 300 tap = new tap_device ();
255 if (!tap) //D this, of course, never catches 301 if (!tap) //D this, of course, never catches
256 { 302 {
257 slog (L_ERR, _("cannot create network interface '%s'"), conf.ifname); 303 slog (L_ERR, _("cannot create network interface '%s'"), conf.ifname);
258 exit (EXIT_FAILURE); 304 exit (EXIT_FAILURE);
259 } 305 }
260 306
307 if (tap->if_up () &&
308 !run_script (run_script_cb (this, &vpn::script_if_init), true))
309 {
310 slog (L_ERR, _("interface initialization command '%s' failed, exiting."),
311 tap->if_up ());
312 exit (EXIT_FAILURE);
313 }
314
261 run_script (run_script_cb (this, &vpn::script_if_up), true); 315 if (!run_script (run_script_cb (this, &vpn::script_if_up), true))
316 {
317 slog (L_ERR, _("if-up command execution failed, exiting."));
318 exit (EXIT_FAILURE);
319 }
262 320
263 tap_ev_watcher.start (tap->fd, EVENT_READ); 321 tap_ev_watcher.start (tap->fd, EVENT_READ);
264 322
265 reconnect_all ();
266
267 return 0; 323 return 0;
268}
269
270// send a vpn packet out to other hosts
271bool
272vpn::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos)
273{
274 switch (si.prot)
275 {
276 case PROT_IPv4:
277 return send_ipv4_packet (pkt, si, tos);
278
279 case PROT_UDPv4:
280 return send_udpv4_packet (pkt, si, tos);
281
282#if ENABLE_TCP
283 case PROT_TCPv4:
284 return send_tcpv4_packet (pkt, si, tos);
285#endif
286
287#if ENABLE_ICMP
288 case PROT_ICMPv4:
289 return send_icmpv4_packet (pkt, si, tos);
290#endif
291
292#if ENABLE_DNS
293 case PROT_DNSv4:
294 return send_dnsv4_packet (pkt, si, tos);
295#endif
296
297 default:
298 slog (L_CRIT, _("%s: FATAL: trying to send packet with unsupported protocol"), (const char *)si);
299 return false;
300 }
301} 324}
302 325
303bool 326bool
304vpn::send_ipv4_packet (vpn_packet *pkt, const sockinfo &si, int tos) 327vpn::send_ipv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)
305{ 328{
… …
424 else 447 else
425 c->recv_vpn_packet (pkt, rsi); 448 c->recv_vpn_packet (pkt, rsi);
426 } 449 }
427} 450}
428 451
452bool
453vpn::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos)
454{
455 switch (si.prot)
456 {
457 case PROT_IPv4:
458 return send_ipv4_packet (pkt, si, tos);
459 case PROT_UDPv4:
460 return send_udpv4_packet (pkt, si, tos);
461#if ENABLE_TCP
462 case PROT_TCPv4:
463 return send_tcpv4_packet (pkt, si, tos);
464#endif
465#if ENABLE_ICMP
466 case PROT_ICMPv4:
467 return send_icmpv4_packet (pkt, si, tos);
468#endif
469#if ENABLE_DNS
470 case PROT_DNSv4:
471 return send_dnsv4_packet (pkt, si, tos);
472#endif
473
474 default:
475 slog (L_CRIT, _("%s: FATAL: trying to send packet with unsupported protocol"), (const char *)si);
476 }
477
478 return false;
479}
480
429void 481void
430vpn::ipv4_ev (io_watcher &w, short revents) 482vpn::ipv4_ev (io_watcher &w, short revents)
431{ 483{
432 if (revents & EVENT_READ) 484 if (revents & EVENT_READ)
433 { 485 {
… …
442 494
443 if (len > 0) 495 if (len > 0)
444 { 496 {
445 pkt->len = len; 497 pkt->len = len;
446 498
447 // raw sockets deliver the ipv4, but don't expect it on sends 499 // raw sockets deliver the ipv4 header, but don't expect it on sends
448 // this is slow, but...
449 pkt->skip_hdr (IP_OVERHEAD); 500 pkt->skip_hdr (IP_OVERHEAD);
450 501
451 recv_vpn_packet (pkt, si); 502 recv_vpn_packet (pkt, si);
452 } 503 }
453 else 504 else
… …
459 delete pkt; 510 delete pkt;
460 } 511 }
461 else 512 else
462 { 513 {
463 slog (L_ERR, 514 slog (L_ERR,
464 _("FATAL: unknown revents %08x in socket, terminating\n"), 515 _("FATAL: unknown revents %08x in socket, terminating\n"),
465 revents); 516 revents);
466 exit (EXIT_FAILURE); 517 exit (EXIT_FAILURE);
467 } 518 }
468} 519}
469 520
470#if ENABLE_ICMP 521#if ENABLE_ICMP
… …
571 int dst = mac2id (pkt->dst); 622 int dst = mac2id (pkt->dst);
572 int src = mac2id (pkt->src); 623 int src = mac2id (pkt->src);
573 624
574 if (src != THISNODE->id) 625 if (src != THISNODE->id)
575 { 626 {
576 slog (L_ERR, _("FATAL: tap packet not originating on current node received, exiting.")); 627 slog (L_ERR, _("FATAL: tap packet not originating on current node received (if-up script not working properly?), exiting."));
577 exit (EXIT_FAILURE); 628 exit (EXIT_FAILURE);
578 } 629 }
579 630
580 if (dst == THISNODE->id) 631 if (dst == THISNODE->id)
581 { 632 {
… …
639 connection_init (); 690 connection_init ();
640 691
641 for (configuration::node_vector::iterator i = conf.nodes.begin (); 692 for (configuration::node_vector::iterator i = conf.nodes.begin ();
642 i != conf.nodes.end (); ++i) 693 i != conf.nodes.end (); ++i)
643 { 694 {
644 connection *conn = new connection (this); 695 connection *conn = new connection (this, *i);
645
646 conn->conf = *i;
647 conns.push_back (conn); 696 conns.push_back (conn);
648
649 conn->establish_connection (); 697 conn->establish_connection ();
650 } 698 }
651} 699}
652 700
653connection *vpn::find_router () 701connection *vpn::find_router ()

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