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Comparing gvpe/src/vpn.C (file contents):
Revision 1.4 by pcg, Fri Apr 4 05:26:45 2003 UTC vs.
Revision 1.19 by pcg, Thu Oct 16 02:41:21 2003 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 Marc Lehmann <pcg@goof.com>
3 4
4 This program is free software; you can redistribute it and/or modify 5 This program is free software; you can redistribute it and/or modify
5 it under the terms of the GNU General Public License as published by 6 it under the terms of the GNU General Public License as published by
6 the Free Software Foundation; either version 2 of the License, or 7 the Free Software Foundation; either version 2 of the License, or
7 (at your option) any later version. 8 (at your option) any later version.
… …
24#include <cstring> 25#include <cstring>
25#include <cstdio> 26#include <cstdio>
26 27
27#include <sys/types.h> 28#include <sys/types.h>
28#include <sys/socket.h> 29#include <sys/socket.h>
29#include <sys/poll.h>
30#include <sys/wait.h> 30#include <sys/wait.h>
31#include <netinet/in.h>
32#include <arpa/inet.h>
33#include <errno.h> 31#include <errno.h>
34#include <time.h> 32#include <time.h>
35#include <unistd.h> 33#include <unistd.h>
34#include <fcntl.h>
35#include <sys/socket.h>
36
37#include "netcompat.h"
36 38
37#include "pidfile.h" 39#include "pidfile.h"
38 40
39#include "connection.h" 41#include "connection.h"
40#include "util.h" 42#include "util.h"
41#include "vpn.h" 43#include "vpn.h"
42
43#if ENABLE_TCP
44# include <map>
45# include <unistd.h>
46# include <fcntl.h>
47# include <sys/poll.h>
48#endif
49 44
50///////////////////////////////////////////////////////////////////////////// 45/////////////////////////////////////////////////////////////////////////////
51 46
52const char *vpn::script_if_up () 47const char *vpn::script_if_up ()
53{ 48{
… …
78} 73}
79 74
80int 75int
81vpn::setup () 76vpn::setup ()
82{ 77{
78 ipv4_fd = -1;
79
80 if (THISNODE->protocols & PROT_IPv4 && ::conf.ip_proto)
81 {
82 ipv4_fd = socket (PF_INET, SOCK_RAW, ::conf.ip_proto);
83
84 if (ipv4_fd < 0)
85 return -1;
86
87 fcntl (ipv4_fd, F_SETFL, O_NONBLOCK);
88
89#if defined(SOL_IP) && defined(IP_MTU_DISCOVER)
90 // this I really consider a linux bug. I am neither connected
91 // nor do I fragment myself. Linux still sets DF and doesn't
92 // fragment for me sometimes.
93 {
94 int oval = IP_PMTUDISC_DONT;
95 setsockopt (ipv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);
96 }
97#endif
98
99 sockinfo si (THISNODE, PROT_IPv4);
100
101 if (bind (ipv4_fd, si.sav4 (), si.salenv4 ()))
102 {
103 slog (L_ERR, _("can't bind ipv4 socket on %s: %s"), (const char *)si, strerror (errno));
104 exit (1);
105 }
106
107 ipv4_ev_watcher.start (ipv4_fd, POLLIN);
108 }
109
83 udpv4_fd = -1; 110 udpv4_fd = -1;
84 111
85 if (THISNODE->protocols & PROT_UDPv4) 112 if (THISNODE->protocols & PROT_UDPv4 && THISNODE->udp_port)
86 { 113 {
87 udpv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP); 114 udpv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP);
88 115
89 if (udpv4_fd < 0) 116 if (udpv4_fd < 0)
90 return -1; 117 return -1;
118
119 fcntl (udpv4_fd, F_SETFL, O_NONBLOCK);
91 120
92 // standard daemon practise... 121 // standard daemon practise...
93 { 122 {
94 int oval = 1; 123 int oval = 1;
95 setsockopt (udpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval); 124 setsockopt (udpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);
96 } 125 }
97 126
98 sockinfo si (THISNODE, PROT_UDPv4); 127#if defined(SOL_IP) && defined(IP_MTU_DISCOVER)
99
100 if (bind (udpv4_fd, si.sav4 (), si.salenv4 ()))
101 {
102 slog (L_ERR, _("can't bind udpv4 on %s: %s"), (const char *)si, strerror (errno));
103 exit (1);
104 }
105
106#ifdef IP_MTU_DISCOVER
107 // this I really consider a linux bug. I am neither connected 128 // this I really consider a linux bug. I am neither connected
108 // nor do I fragment myself. Linux still sets DF and doesn't 129 // nor do I fragment myself. Linux still sets DF and doesn't
109 // fragment for me sometimes. 130 // fragment for me sometimes.
110 { 131 {
111 int oval = IP_PMTUDISC_DONT; 132 int oval = IP_PMTUDISC_DONT;
112 setsockopt (udpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval); 133 setsockopt (udpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);
113 } 134 }
114#endif 135#endif
115 136
137 sockinfo si (THISNODE, PROT_UDPv4);
138
139 if (bind (udpv4_fd, si.sav4 (), si.salenv4 ()))
140 {
141 slog (L_ERR, _("can't bind udpv4 on %s: %s"), (const char *)si, strerror (errno));
142 exit (1);
143 }
144
116 udpv4_ev_watcher.start (udpv4_fd, POLLIN); 145 udpv4_ev_watcher.start (udpv4_fd, POLLIN);
117 } 146 }
118 147
119 ipv4_fd = -1; 148 icmpv4_fd = -1;
149
150#if ENABLE_ICMP
120 if (THISNODE->protocols & PROT_IPv4) 151 if (THISNODE->protocols & PROT_ICMPv4)
121 { 152 {
122 ipv4_fd = socket (PF_INET, SOCK_RAW, ::conf.ip_proto); 153 icmpv4_fd = socket (PF_INET, SOCK_RAW, IPPROTO_ICMP);
123 154
124 if (ipv4_fd < 0) 155 if (icmpv4_fd < 0)
125 return -1; 156 return -1;
126 157
127 sockinfo si (THISNODE, PROT_IPv4); 158 fcntl (icmpv4_fd, F_SETFL, O_NONBLOCK);
128 159
129 if (bind (ipv4_fd, si.sav4 (), si.salenv4 ())) 160#ifdef ICMP_FILTER
130 { 161 {
131 slog (L_ERR, _("can't bind ipv4 socket on %s: %s"), (const char *)si, strerror (errno)); 162 icmp_filter oval;
132 exit (1); 163 oval.data = 0xffffffff;
164 if (::conf.icmp_type < 32)
165 oval.data &= ~(1 << ::conf.icmp_type);
166
167 setsockopt (icmpv4_fd, SOL_RAW, ICMP_FILTER, &oval, sizeof oval);
133 } 168 }
169#endif
134 170
135#ifdef IP_MTU_DISCOVER 171#if defined(SOL_IP) && defined(IP_MTU_DISCOVER)
136 // this I really consider a linux bug. I am neither connected 172 // this I really consider a linux bug. I am neither connected
137 // nor do I fragment myself. Linux still sets DF and doesn't 173 // nor do I fragment myself. Linux still sets DF and doesn't
138 // fragment for me sometimes. 174 // fragment for me sometimes.
139 { 175 {
140 int oval = IP_PMTUDISC_DONT; 176 int oval = IP_PMTUDISC_DONT;
141 setsockopt (ipv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval); 177 setsockopt (udpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);
142 } 178 }
143#endif 179#endif
144 180
181 sockinfo si (THISNODE, PROT_ICMPv4);
182
183 if (bind (icmpv4_fd, si.sav4 (), si.salenv4 ()))
184 {
185 slog (L_ERR, _("can't bind icmpv4 on %s: %s"), (const char *)si, strerror (errno));
186 exit (1);
187 }
188
145 ipv4_ev_watcher.start (ipv4_fd, POLLIN); 189 icmpv4_ev_watcher.start (icmpv4_fd, POLLIN);
146 } 190 }
191#endif
192
193 tcpv4_fd = -1;
147 194
148#if ENABLE_TCP 195#if ENABLE_TCP
149 if (THISNODE->protocols & PROT_TCPv4) 196 if (THISNODE->protocols & PROT_TCPv4 && THISNODE->tcp_port)
150 { 197 {
151 tcpv4_fd = socket (PF_INET, SOCK_STREAM, IPPROTO_TCP); 198 tcpv4_fd = socket (PF_INET, SOCK_STREAM, IPPROTO_TCP);
152 199
153 if (tcpv4_fd < 0) 200 if (tcpv4_fd < 0)
154 return -1; 201 return -1;
202
203 fcntl (tcpv4_fd, F_SETFL, O_NONBLOCK);
155 204
156 // standard daemon practise... 205 // standard daemon practise...
157 { 206 {
158 int oval = 1; 207 int oval = 1;
159 setsockopt (tcpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval); 208 setsockopt (tcpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);
… …
191 reconnect_all (); 240 reconnect_all ();
192 241
193 return 0; 242 return 0;
194} 243}
195 244
196void 245// send a vpn packet out to other hosts
246bool
247vpn::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos)
248{
249 switch (si.prot)
250 {
251 case PROT_IPv4:
252 return send_ipv4_packet (pkt, si, tos);
253
254 case PROT_UDPv4:
255 return send_udpv4_packet (pkt, si, tos);
256
257#if ENABLE_TCP
258 case PROT_TCPv4:
259 return send_tcpv4_packet (pkt, si, tos);
260#endif
261
262#if ENABLE_ICMP
263 case PROT_ICMPv4:
264 return send_icmpv4_packet (pkt, si, tos);
265#endif
266
267 default:
268 slog (L_CRIT, _("%s: FATAL: trying to send packet with unsupported protocol"), (const char *)si);
269 return false;
270 }
271}
272
273bool
197vpn::send_ipv4_packet (vpn_packet *pkt, const sockinfo &si, int tos) 274vpn::send_ipv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)
198{ 275{
276#if defined(SOL_IP) && defined(IP_TOS)
199 setsockopt (ipv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos); 277 setsockopt (ipv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);
278#endif
200 sendto (ipv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ()); 279 sendto (ipv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());
201}
202 280
203void 281 return true;
282}
283
284static u16
285ipv4_checksum (u16 *data, unsigned int len)
286{
287 // use 32 bit accumulator and fold back carry bits at the end
288 u32 sum = 0;
289
290 while (len > 1)
291 {
292 sum += *data++;
293 len -= 2;
294 }
295
296 // odd byte left?
297 if (len)
298 sum += *(u8 *)data;
299
300 // add back carry bits
301 sum = (sum >> 16) + (sum & 0xffff); // lo += hi
302 sum += (sum >> 16); // carry
303
304 return ~sum;
305}
306
307#if ENABLE_ICMP
308bool
309vpn::send_icmpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)
310{
311#if defined(SOL_IP) && defined(IP_TOS)
312 setsockopt (icmpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);
313#endif
314
315 pkt->unshift_hdr (4);
316
317 icmp_header *hdr = (icmp_header *)&((*pkt)[0]);
318 hdr->type = ::conf.icmp_type;
319 hdr->code = 255;
320 hdr->checksum = 0;
321 hdr->checksum = ipv4_checksum ((u16 *)hdr, pkt->len);
322
323 sendto (icmpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());
324
325 return true;
326}
327#endif
328
329bool
204vpn::send_udpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos) 330vpn::send_udpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)
205{ 331{
332#if defined(SOL_IP) && defined(IP_TOS)
206 setsockopt (udpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos); 333 setsockopt (udpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);
334#endif
207 sendto (udpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ()); 335 sendto (udpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());
336
337 return true;
338}
339
340void
341vpn::inject_data_packet (tap_packet *pkt, int dst)
342{
343 if (dst)
344 {
345 // unicast
346 if (dst != THISNODE->id)
347 conns[dst - 1]->inject_data_packet (pkt);
348 }
349 else
350 {
351 // broadcast, this is ugly, but due to the security policy
352 // we have to connect to all hosts...
353 for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)
354 if ((*c)->conf != THISNODE)
355 (*c)->inject_data_packet (pkt, true);
356 }
208} 357}
209 358
210void 359void
211vpn::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi) 360vpn::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)
212{ 361{
… …
219 if (src == 0 || src > conns.size () 368 if (src == 0 || src > conns.size ()
220 || dst > conns.size () 369 || dst > conns.size ()
221 || pkt->typ () >= vpn_packet::PT_MAX) 370 || pkt->typ () >= vpn_packet::PT_MAX)
222 slog (L_WARN, _("(%s): received corrupted packet type %d (src %d, dst %d)"), 371 slog (L_WARN, _("(%s): received corrupted packet type %d (src %d, dst %d)"),
223 (const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ()); 372 (const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ());
373 else if (dst > conns.size ())
374 slog (L_WARN, _("(%s): received corrupted packet type %d (src %d, dst %d)"),
375 (const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ());
224 else 376 else
225 { 377 {
226 connection *c = conns[src - 1]; 378 connection *c = conns[src - 1];
227 379
228 if (dst == 0 && !THISNODE->routerprio) 380 if (dst == 0)
229 slog (L_WARN, _("%s(%s): received broadcast, but we are no router"), 381 slog (L_WARN, _("%s(%s): received broadcast (protocol violation)"),
230 c->conf->nodename, (const char *)rsi); 382 c->conf->nodename, (const char *)rsi);
231 else if (dst != 0 && dst != THISNODE->id) 383 else if (dst != THISNODE->id)
232 // FORWARDING NEEDED ;) 384 {
385 if (THISNODE->routerprio)
386 // the tos setting gets lost here. who cares.
387 conns[dst - 1]->inject_vpn_packet (pkt);
388 else
233 slog (L_WARN, 389 slog (L_WARN,
234 _("received frame for node %d ('%s') from %s, but this is node %d ('%s')"), 390 _("%s(%s): forwarding request (=> %s), but we are no router"),
391 c->conf->nodename, (const char *)rsi,
235 dst, conns[dst - 1]->conf->nodename, 392 conns[dst - 1]->conf->nodename);
236 (const char *)rsi, 393 }
237 THISNODE->id, THISNODE->nodename);
238 else 394 else
239 c->recv_vpn_packet (pkt, rsi); 395 c->recv_vpn_packet (pkt, rsi);
240 } 396 }
241} 397}
242 398
243void 399void
244vpn::udpv4_ev (io_watcher &w, short revents) 400vpn::ipv4_ev (io_watcher &w, short revents)
245{ 401{
246 if (revents & (POLLIN | POLLERR)) 402 if (revents & (POLLIN | POLLERR))
247 { 403 {
248 vpn_packet *pkt = new vpn_packet; 404 vpn_packet *pkt = new vpn_packet;
249 struct sockaddr_in sa; 405 struct sockaddr_in sa;
250 socklen_t sa_len = sizeof (sa); 406 socklen_t sa_len = sizeof (sa);
251 int len; 407 int len;
252 408
253 len = recvfrom (w.p->fd, &((*pkt)[0]), MAXSIZE, 0, (sockaddr *)&sa, &sa_len); 409 len = recvfrom (w.fd, &((*pkt)[0]), MAXSIZE, 0, (sockaddr *)&sa, &sa_len);
254 410
255 sockinfo si(sa); 411 sockinfo si(sa, PROT_IPv4);
256 412
257 if (len > 0) 413 if (len > 0)
258 { 414 {
259 pkt->len = len; 415 pkt->len = len;
416
417 // raw sockets deliver the ipv4, but don't expect it on sends
418 // this is slow, but...
419 pkt->skip_hdr (IP_OVERHEAD);
260 420
261 recv_vpn_packet (pkt, si); 421 recv_vpn_packet (pkt, si);
262 } 422 }
263 else 423 else
264 { 424 {
… …
269 delete pkt; 429 delete pkt;
270 } 430 }
271 else if (revents & POLLHUP) 431 else if (revents & POLLHUP)
272 { 432 {
273 // this cannot ;) happen on udp sockets 433 // this cannot ;) happen on udp sockets
274 slog (L_ERR, _("FATAL: POLLHUP on udp v4 fd, terminating.")); 434 slog (L_ERR, _("FATAL: POLLHUP on ipv4 fd, terminating."));
275 exit (1); 435 exit (1);
276 } 436 }
277 else 437 else
278 { 438 {
279 slog (L_ERR, 439 slog (L_ERR,
… …
281 revents); 441 revents);
282 exit (1); 442 exit (1);
283 } 443 }
284} 444}
285 445
446#if ENABLE_ICMP
286void 447void
287vpn::ipv4_ev (io_watcher &w, short revents) 448vpn::icmpv4_ev (io_watcher &w, short revents)
288{ 449{
289 if (revents & (POLLIN | POLLERR)) 450 if (revents & (POLLIN | POLLERR))
290 { 451 {
291 vpn_packet *pkt = new vpn_packet; 452 vpn_packet *pkt = new vpn_packet;
292 struct sockaddr_in sa; 453 struct sockaddr_in sa;
293 socklen_t sa_len = sizeof (sa); 454 socklen_t sa_len = sizeof (sa);
294 int len; 455 int len;
295 456
296 len = recvfrom (w.p->fd, &((*pkt)[0]), MAXSIZE, 0, (sockaddr *)&sa, &sa_len); 457 len = recvfrom (w.fd, &((*pkt)[0]), MAXSIZE, 0, (sockaddr *)&sa, &sa_len);
297 458
298 sockinfo si(sa, PROT_IPv4); 459 sockinfo si(sa, PROT_ICMPv4);
299 460
300 if (len > 0) 461 if (len > 0)
301 { 462 {
302 pkt->len = len; 463 pkt->len = len;
303 464
465 icmp_header *hdr = (icmp_header *)&((*pkt)[IP_OVERHEAD]);
466
467 if (hdr->type == ::conf.icmp_type
468 && hdr->code == 255)
469 {
304 // raw sockets deliver the ipv4, but don't expect it on sends 470 // raw sockets deliver the ipv4, but don't expect it on sends
305 // this is slow, but... 471 // this is slow, but...
306 pkt->skip_hdr (IP_OVERHEAD); 472 pkt->skip_hdr (ICMP_OVERHEAD);
307 473
308 recv_vpn_packet (pkt, si); 474 recv_vpn_packet (pkt, si);
475 }
309 } 476 }
310 else 477 else
311 { 478 {
312 // probably ECONNRESET or somesuch 479 // probably ECONNRESET or somesuch
313 slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno)); 480 slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno));
… …
316 delete pkt; 483 delete pkt;
317 } 484 }
318 else if (revents & POLLHUP) 485 else if (revents & POLLHUP)
319 { 486 {
320 // this cannot ;) happen on udp sockets 487 // this cannot ;) happen on udp sockets
321 slog (L_ERR, _("FATAL: POLLHUP on ipv4 fd, terminating.")); 488 slog (L_ERR, _("FATAL: POLLHUP on icmpv4 fd, terminating."));
322 exit (1); 489 exit (1);
323 } 490 }
324 else 491 else
325 { 492 {
326 slog (L_ERR, 493 slog (L_ERR,
327 _("FATAL: unknown revents %08x in socket, terminating\n"), 494 _("FATAL: unknown revents %08x in socket, terminating\n"),
328 revents); 495 revents);
329 exit (1); 496 exit (1);
330 } 497 }
331} 498}
499#endif
332 500
333#if ENABLE_TCP 501void
334
335struct tcp_connection;
336
337struct lt_sockinfo
338{
339 bool operator()(const sockinfo *a, const sockinfo *b) const
340 {
341 return *a < *b;
342 }
343};
344
345struct tcp_si_map : public map<const sockinfo *, tcp_connection *, lt_sockinfo> {
346 void cleaner_cb (time_watcher &w); time_watcher cleaner;
347
348 tcp_si_map ()
349 : cleaner(this, &tcp_si_map::cleaner_cb)
350 {
351 cleaner.start (0);
352 }
353} tcp_si;
354
355struct tcp_connection : io_watcher {
356 tstamp last_activity;
357 const sockinfo si;
358 vpn &v;
359 bool ok;
360
361 vpn_packet *r_pkt;
362 u32 r_len, r_ofs;
363
364 void tcpv4_ev (io_watcher &w, short revents); 502vpn::udpv4_ev (io_watcher &w, short revents)
365
366 operator tcp_si_map::value_type()
367 {
368 return tcp_si_map::value_type (&si, this);
369 }
370
371 tcp_connection (int fd, const sockinfo &si_, vpn &v_)
372 : v(v_), si(si_), io_watcher(this, &tcp_connection::tcpv4_ev)
373 {
374 last_activity = NOW;
375 ok = false;
376 r_pkt = 0;
377 start (fd, POLLOUT);
378 }
379
380 ~tcp_connection () { if (p) close (p->fd); }
381};
382
383void tcp_si_map::cleaner_cb (time_watcher &w)
384{ 503{
385 w.at = NOW + 600;
386 tstamp to = NOW - ::conf.keepalive - 30;
387
388 for (iterator i = begin (); i != end(); )
389 if (i->second->last_activity >= to)
390 ++i;
391 else
392 {
393 erase (i);
394 i = begin ();
395 }
396}
397
398void
399vpn::send_tcpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)
400{
401 tcp_si_map::iterator info = tcp_si.find (&si);
402
403 if (info == tcp_si.end ())
404 {
405 // woaw, the first lost packet ;)
406 int fd = socket (PF_INET, SOCK_STREAM, IPPROTO_TCP);
407
408 if (fd >= 0)
409 {
410 fcntl (fd, F_SETFL, O_NONBLOCK);
411
412 if (connect (fd, si.sav4 (), si.salenv4 ()) >= 0
413 || errno == EINPROGRESS)
414 {
415 tcp_connection *i = new tcp_connection (fd, si, *this);
416
417 tcp_si.insert (*i);
418 }
419 else
420 close (fd);
421 }
422 }
423 else
424 {
425 tcp_connection *i = info->second;
426
427 i->last_activity = NOW;
428
429 if (i->ok)
430 {
431 setsockopt (i->p->fd, SOL_IP, IP_TOS, &tos, sizeof tos);
432
433 // we use none of the advantages of tcp
434 write (i->p->fd, (void *)pkt, pkt->len + sizeof (u32)) != pkt->len + sizeof (u32);
435 }
436 }
437
438#if 0
439 setsockopt (udpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);
440 sendto (udpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());
441#endif
442}
443
444void
445tcp_connection::tcpv4_ev (io_watcher &w, short revents)
446{
447 last_activity = NOW;
448
449 if (!ok) // just established?
450 {
451 ok = true;
452 set (POLLIN);
453 }
454
455 if (revents & (POLLIN | POLLERR)) 504 if (revents & (POLLIN | POLLERR))
456 { 505 {
457 u32 len;
458
459 if (sizeof (len) == read (p->fd, &len, sizeof (len)))
460 {
461 vpn_packet *pkt = new vpn_packet; 506 vpn_packet *pkt = new vpn_packet;
462
463 if (len == read (p->fd, &((*pkt)[0]), len))
464 {
465 pkt->len = len;
466
467 v.recv_vpn_packet (pkt, si);
468 return;
469 }
470
471 delete pkt;
472 }
473
474 tcp_si.erase (&si);
475
476 set (0);//D
477 }
478}
479
480void
481vpn::tcpv4_ev (io_watcher &w, short revents)
482{
483 if (revents & (POLLIN | POLLERR))
484 {
485 struct sockaddr_in sa; 507 struct sockaddr_in sa;
486 socklen_t sa_len = sizeof (sa); 508 socklen_t sa_len = sizeof (sa);
487 int len; 509 int len;
488 510
489 int fd = accept (w.p->fd, (sockaddr *)&sa, &sa_len); 511 len = recvfrom (w.fd, &((*pkt)[0]), MAXSIZE, 0, (sockaddr *)&sa, &sa_len);
490 512
491 if (fd >= 0)
492 {
493 fcntl (fd, F_SETFL, O_NONBLOCK);
494
495 sockinfo si(sa, PROT_TCPv4); 513 sockinfo si(sa, PROT_UDPv4);
496 tcp_connection *i = new tcp_connection (fd, si, *this);
497 514
498 slog (L_DEBUG, _("accepted tcp connection from %s\n"), (const char *)si);//D 515 if (len > 0)
499
500 tcp_si.insert (*i);
501 } 516 {
517 pkt->len = len;
518
519 recv_vpn_packet (pkt, si);
520 }
521 else
522 {
523 // probably ECONNRESET or somesuch
524 slog (L_DEBUG, _("%s: fd %d, %s"), (const char *)si, w.fd, strerror (errno));
525 }
526
527 delete pkt;
528 }
529 else if (revents & POLLHUP)
502 } 530 {
531 // this cannot ;) happen on udp sockets
532 slog (L_ERR, _("FATAL: POLLHUP on udp v4 fd, terminating."));
533 exit (1);
534 }
535 else
536 {
537 slog (L_ERR,
538 _("FATAL: unknown revents %08x in socket, terminating\n"),
539 revents);
540 exit (1);
541 }
503} 542}
504
505#endif
506 543
507void 544void
508vpn::tap_ev (io_watcher &w, short revents) 545vpn::tap_ev (io_watcher &w, short revents)
509{ 546{
510 if (revents & POLLIN) 547 if (revents & POLLIN)
… …
512 /* process data */ 549 /* process data */
513 tap_packet *pkt; 550 tap_packet *pkt;
514 551
515 pkt = tap->recv (); 552 pkt = tap->recv ();
516 553
554 if (!pkt)
555 return;
556
557 if (pkt->len > 14)
558 {
517 int dst = mac2id (pkt->dst); 559 int dst = mac2id (pkt->dst);
518 int src = mac2id (pkt->src); 560 int src = mac2id (pkt->src);
519 561
520 if (src != THISNODE->id) 562 if (src != THISNODE->id)
521 {
522 slog (L_ERR, _("FATAL: tap packet not originating on current node received, terminating."));
523 exit (1);
524 }
525
526 if (dst == THISNODE->id)
527 {
528 slog (L_ERR, _("FATAL: tap packet destined for current node received, terminating."));
529 exit (1);
530 }
531
532 if (dst > conns.size ())
533 slog (L_ERR, _("tap packet for unknown node %d received, ignoring."), dst);
534 else
535 {
536 if (dst)
537 { 563 {
538 // unicast 564 slog (L_ERR, _("FATAL: tap packet not originating on current node received, exiting."));
539 if (dst != THISNODE->id) 565 exit (1);
540 conns[dst - 1]->inject_data_packet (pkt);
541 } 566 }
567
568 if (dst == THISNODE->id)
569 {
570 slog (L_ERR, _("FATAL: tap packet destined for current node received, exiting."));
571 exit (1);
572 }
573
574 if (dst > conns.size ())
575 slog (L_ERR, _("tap packet for unknown node %d received, ignoring."), dst);
542 else 576 else
543 {
544 // broadcast, first check router, then self, then english
545 connection *router = find_router ();
546
547 if (router)
548 router->inject_data_packet (pkt, true); 577 inject_data_packet (pkt, dst);
549 else
550 for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)
551 if ((*c)->conf != THISNODE)
552 (*c)->inject_data_packet (pkt);
553 }
554 } 578 }
555 579
556 delete pkt; 580 delete pkt;
557 } 581 }
558 else if (revents & (POLLHUP | POLLERR)) 582 else if (revents & (POLLHUP | POLLERR))
… …
624 } 648 }
625} 649}
626 650
627connection *vpn::find_router () 651connection *vpn::find_router ()
628{ 652{
629 u32 prio = 0; 653 u32 prio = 1;
630 connection *router = 0; 654 connection *router = 0;
631 655
632 for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i) 656 for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)
633 { 657 {
634 connection *c = *i; 658 connection *c = *i;
635 659
636 if (c->conf->routerprio > prio 660 if (c->conf->routerprio > prio
637 && c->connectmode == conf_node::C_ALWAYS 661 && c->connectmode == conf_node::C_ALWAYS // so we don't drop the connection if in use
638 && c->conf != THISNODE
639 && c->ictx && c->octx) 662 && c->ictx && c->octx
663 && c->conf != THISNODE) // redundant, since ictx==octx==0 always on thisnode
640 { 664 {
641 prio = c->conf->routerprio; 665 prio = c->conf->routerprio;
642 router = c; 666 router = c;
643 } 667 }
644 } 668 }
645 669
646 return router; 670 return router;
647} 671}
648 672
649void vpn::connect_request (int id) 673void vpn::send_connect_request (int id)
650{ 674{
651 connection *c = find_router (); 675 connection *c = find_router ();
652 676
653 if (c) 677 if (c)
654 c->connect_request (id); 678 c->send_connect_request (id);
655 //else // does not work, because all others must connect to the same router 679 else
656 // // no router found, aggressively connect to all routers 680 // no router found, aggressively connect to all routers
657 // for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i) 681 for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)
658 // if ((*i)->conf->routerprio) 682 if ((*i)->conf->routerprio && (*i)->conf != THISNODE)
659 // (*i)->establish_connection (); 683 (*i)->establish_connection ();
660} 684}
661 685
662void 686void
663connection::dump_status () 687connection::dump_status ()
664{ 688{
… …
681 705
682 slog (L_NOTICE, _("END status dump")); 706 slog (L_NOTICE, _("END status dump"));
683} 707}
684 708
685vpn::vpn (void) 709vpn::vpn (void)
686: event(this, &vpn::event_cb) 710: event (this, &vpn::event_cb)
687, udpv4_ev_watcher(this, &vpn::udpv4_ev) 711, udpv4_ev_watcher (this, &vpn::udpv4_ev)
688, ipv4_ev_watcher (this, &vpn::ipv4_ev) 712, ipv4_ev_watcher (this, &vpn::ipv4_ev)
689, tap_ev_watcher (this, &vpn::tap_ev)
690#if ENABLE_TCP 713#if ENABLE_TCP
691, tcpv4_ev_watcher(this, &vpn::tcpv4_ev) 714, tcpv4_ev_watcher (this, &vpn::tcpv4_ev)
692#endif 715#endif
716#if ENABLE_ICMP
717, icmpv4_ev_watcher(this, &vpn::icmpv4_ev)
718#endif
719, tap_ev_watcher (this, &vpn::tap_ev)
693{ 720{
694} 721}
695 722
696vpn::~vpn () 723vpn::~vpn ()
697{ 724{

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