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Comparing gvpe/src/vpn.C (file contents):
Revision 1.3 by pcg, Wed Apr 2 21:02:25 2003 UTC vs.
Revision 1.18 by pcg, Thu Oct 16 02:28:36 2003 UTC

… …
24#include <cstring> 24#include <cstring>
25#include <cstdio> 25#include <cstdio>
26 26
27#include <sys/types.h> 27#include <sys/types.h>
28#include <sys/socket.h> 28#include <sys/socket.h>
29#include <sys/poll.h>
30#include <sys/wait.h> 29#include <sys/wait.h>
31#include <netinet/in.h>
32#include <arpa/inet.h>
33#include <errno.h> 30#include <errno.h>
34#include <time.h> 31#include <time.h>
35#include <unistd.h> 32#include <unistd.h>
33#include <fcntl.h>
34#include <sys/socket.h>
35
36#include "netcompat.h"
36 37
37#include "pidfile.h" 38#include "pidfile.h"
38 39
39#include "connection.h" 40#include "connection.h"
40#include "util.h" 41#include "util.h"
41#include "vpn.h" 42#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 43
50///////////////////////////////////////////////////////////////////////////// 44/////////////////////////////////////////////////////////////////////////////
51 45
52const char *vpn::script_if_up () 46const char *vpn::script_if_up ()
53{ 47{
… …
78} 72}
79 73
80int 74int
81vpn::setup () 75vpn::setup ()
82{ 76{
77 ipv4_fd = -1;
78
79 if (THISNODE->protocols & PROT_IPv4 && ::conf.ip_proto)
80 {
81 ipv4_fd = socket (PF_INET, SOCK_RAW, ::conf.ip_proto);
82
83 if (ipv4_fd < 0)
84 return -1;
85
86 fcntl (ipv4_fd, F_SETFL, O_NONBLOCK);
87
88#if defined(SOL_IP) && defined(IP_MTU_DISCOVER)
89 // this I really consider a linux bug. I am neither connected
90 // nor do I fragment myself. Linux still sets DF and doesn't
91 // fragment for me sometimes.
92 {
93 int oval = IP_PMTUDISC_DONT;
94 setsockopt (ipv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);
95 }
96#endif
97
98 sockinfo si (THISNODE, PROT_IPv4);
99
100 if (bind (ipv4_fd, si.sav4 (), si.salenv4 ()))
101 {
102 slog (L_ERR, _("can't bind ipv4 socket on %s: %s"), (const char *)si, strerror (errno));
103 exit (1);
104 }
105
106 ipv4_ev_watcher.start (ipv4_fd, POLLIN);
107 }
108
83 udpv4_fd = -1; 109 udpv4_fd = -1;
84 110
85 if (THISNODE->protocols & PROT_UDPv4) 111 if (THISNODE->protocols & PROT_UDPv4 && THISNODE->udp_port)
86 { 112 {
87 udpv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP); 113 udpv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP);
88 114
89 if (udpv4_fd < 0) 115 if (udpv4_fd < 0)
90 return -1; 116 return -1;
117
118 fcntl (udpv4_fd, F_SETFL, O_NONBLOCK);
91 119
92 // standard daemon practise... 120 // standard daemon practise...
93 { 121 {
94 int oval = 1; 122 int oval = 1;
95 setsockopt (udpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval); 123 setsockopt (udpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);
96 } 124 }
97 125
98 sockinfo si (THISNODE, PROT_UDPv4); 126#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 127 // this I really consider a linux bug. I am neither connected
108 // nor do I fragment myself. Linux still sets DF and doesn't 128 // nor do I fragment myself. Linux still sets DF and doesn't
109 // fragment for me sometimes. 129 // fragment for me sometimes.
110 { 130 {
111 int oval = IP_PMTUDISC_DONT; 131 int oval = IP_PMTUDISC_DONT;
112 setsockopt (udpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval); 132 setsockopt (udpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);
113 } 133 }
114#endif 134#endif
115 135
136 sockinfo si (THISNODE, PROT_UDPv4);
137
138 if (bind (udpv4_fd, si.sav4 (), si.salenv4 ()))
139 {
140 slog (L_ERR, _("can't bind udpv4 on %s: %s"), (const char *)si, strerror (errno));
141 exit (1);
142 }
143
116 udpv4_ev_watcher.start (udpv4_fd, POLLIN); 144 udpv4_ev_watcher.start (udpv4_fd, POLLIN);
117 } 145 }
118 146
119 ipv4_fd = -1; 147 icmpv4_fd = -1;
148
149#if ENABLE_ICMP
120 if (THISNODE->protocols & PROT_IPv4) 150 if (THISNODE->protocols & PROT_ICMPv4)
121 { 151 {
122 ipv4_fd = socket (PF_INET, SOCK_RAW, ::conf.ip_proto); 152 icmpv4_fd = socket (PF_INET, SOCK_RAW, IPPROTO_ICMP);
123 153
124 if (ipv4_fd < 0) 154 if (icmpv4_fd < 0)
125 return -1; 155 return -1;
126 156
127 sockinfo si (THISNODE, PROT_IPv4); 157 fcntl (icmpv4_fd, F_SETFL, O_NONBLOCK);
128 158
129 if (bind (ipv4_fd, si.sav4 (), si.salenv4 ())) 159#ifdef ICMP_FILTER
130 { 160 {
131 slog (L_ERR, _("can't bind ipv4 socket on %s: %s"), (const char *)si, strerror (errno)); 161 icmp_filter oval;
132 exit (1); 162 oval.data = 0xffffffff;
163 if (::conf.icmp_type < 32)
164 oval.data &= ~(1 << ::conf.icmp_type);
165
166 setsockopt (icmpv4_fd, SOL_RAW, ICMP_FILTER, &oval, sizeof oval);
133 } 167 }
168#endif
134 169
135#ifdef IP_MTU_DISCOVER 170#if defined(SOL_IP) && defined(IP_MTU_DISCOVER)
136 // this I really consider a linux bug. I am neither connected 171 // this I really consider a linux bug. I am neither connected
137 // nor do I fragment myself. Linux still sets DF and doesn't 172 // nor do I fragment myself. Linux still sets DF and doesn't
138 // fragment for me sometimes. 173 // fragment for me sometimes.
139 { 174 {
140 int oval = IP_PMTUDISC_DONT; 175 int oval = IP_PMTUDISC_DONT;
141 setsockopt (ipv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval); 176 setsockopt (udpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);
142 } 177 }
143#endif 178#endif
144 179
180 sockinfo si (THISNODE, PROT_ICMPv4);
181
182 if (bind (icmpv4_fd, si.sav4 (), si.salenv4 ()))
183 {
184 slog (L_ERR, _("can't bind icmpv4 on %s: %s"), (const char *)si, strerror (errno));
185 exit (1);
186 }
187
145 ipv4_ev_watcher.start (ipv4_fd, POLLIN); 188 icmpv4_ev_watcher.start (icmpv4_fd, POLLIN);
146 } 189 }
190#endif
191
192 tcpv4_fd = -1;
147 193
148#if ENABLE_TCP 194#if ENABLE_TCP
149 if (THISNODE->protocols & PROT_TCPv4) 195 if (THISNODE->protocols & PROT_TCPv4 && THISNODE->tcp_port)
150 { 196 {
151 tcpv4_fd = socket (PF_INET, SOCK_STREAM, IPPROTO_TCP); 197 tcpv4_fd = socket (PF_INET, SOCK_STREAM, IPPROTO_TCP);
152 198
153 if (tcpv4_fd < 0) 199 if (tcpv4_fd < 0)
154 return -1; 200 return -1;
201
202 fcntl (tcpv4_fd, F_SETFL, O_NONBLOCK);
155 203
156 // standard daemon practise... 204 // standard daemon practise...
157 { 205 {
158 int oval = 1; 206 int oval = 1;
159 setsockopt (tcpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval); 207 setsockopt (tcpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);
… …
191 reconnect_all (); 239 reconnect_all ();
192 240
193 return 0; 241 return 0;
194} 242}
195 243
196void 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}
271
272bool
197vpn::send_ipv4_packet (vpn_packet *pkt, const sockinfo &si, int tos) 273vpn::send_ipv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)
198{ 274{
275#if defined(SOL_IP) && defined(IP_TOS)
199 setsockopt (ipv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos); 276 setsockopt (ipv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);
277#endif
200 sendto (ipv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ()); 278 sendto (ipv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());
201}
202 279
203void 280 return true;
281}
282
283static u16
284ipv4_checksum (u16 *data, unsigned int len)
285{
286 // use 32 bit accumulator and fold back carry bits at the end
287 u32 sum = 0;
288
289 while (len > 1)
290 {
291 sum += *data++;
292 len -= 2;
293 }
294
295 // odd byte left?
296 if (len)
297 sum += *(u8 *)data;
298
299 // add back carry bits
300 sum = (sum >> 16) + (sum & 0xffff); // lo += hi
301 sum += (sum >> 16); // carry
302
303 return ~sum;
304}
305
306#if ENABLE_ICMP
307bool
308vpn::send_icmpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)
309{
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);
315
316 icmp_header *hdr = (icmp_header *)&((*pkt)[0]);
317 hdr->type = ::conf.icmp_type;
318 hdr->code = 255;
319 hdr->checksum = 0;
320 hdr->checksum = ipv4_checksum ((u16 *)hdr, pkt->len);
321
322 sendto (icmpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());
323
324 return true;
325}
326#endif
327
328bool
204vpn::send_udpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos) 329vpn::send_udpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)
205{ 330{
331#if defined(SOL_IP) && defined(IP_TOS)
206 setsockopt (udpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos); 332 setsockopt (udpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);
333#endif
207 sendto (udpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ()); 334 sendto (udpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());
335
336 return true;
337}
338
339void
340vpn::inject_data_packet (tap_packet *pkt, int dst)
341{
342 if (dst)
343 {
344 // unicast
345 if (dst != THISNODE->id)
346 conns[dst - 1]->inject_data_packet (pkt);
347 }
348 else
349 {
350 // broadcast, this is ugly, but due to the security policy
351 // we have to connect to all hosts...
352 for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)
353 if ((*c)->conf != THISNODE)
354 (*c)->inject_data_packet (pkt, true);
355 }
208} 356}
209 357
210void 358void
211vpn::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi) 359vpn::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)
212{ 360{
… …
219 if (src == 0 || src > conns.size () 367 if (src == 0 || src > conns.size ()
220 || dst > conns.size () 368 || dst > conns.size ()
221 || pkt->typ () >= vpn_packet::PT_MAX) 369 || pkt->typ () >= vpn_packet::PT_MAX)
222 slog (L_WARN, _("(%s): received corrupted packet type %d (src %d, dst %d)"), 370 slog (L_WARN, _("(%s): received corrupted packet type %d (src %d, dst %d)"),
223 (const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ()); 371 (const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ());
372 else if (dst > conns.size ())
373 slog (L_WARN, _("(%s): received corrupted packet type %d (src %d, dst %d)"),
374 (const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ());
224 else 375 else
225 { 376 {
226 connection *c = conns[src - 1]; 377 connection *c = conns[src - 1];
227 378
228 if (dst == 0 && !THISNODE->routerprio) 379 if (dst == 0)
229 slog (L_WARN, _("%s(%s): received broadcast, but we are no router"), 380 slog (L_WARN, _("%s(%s): received broadcast (protocol violation)"),
230 c->conf->nodename, (const char *)rsi); 381 c->conf->nodename, (const char *)rsi);
231 else if (dst != 0 && dst != THISNODE->id) 382 else if (dst != THISNODE->id)
232 // FORWARDING NEEDED ;) 383 {
384 if (THISNODE->routerprio)
385 // the tos setting gets lost here. who cares.
386 conns[dst - 1]->inject_vpn_packet (pkt);
387 else
233 slog (L_WARN, 388 slog (L_WARN,
234 _("received frame for node %d ('%s') from %s, but this is node %d ('%s')"), 389 _("%s(%s): forwarding request (=> %s), but we are no router"),
390 c->conf->nodename, (const char *)rsi,
235 dst, conns[dst - 1]->conf->nodename, 391 conns[dst - 1]->conf->nodename);
236 (const char *)rsi, 392 }
237 THISNODE->id, THISNODE->nodename);
238 else 393 else
239 c->recv_vpn_packet (pkt, rsi); 394 c->recv_vpn_packet (pkt, rsi);
240 } 395 }
241} 396}
242 397
243void 398void
244vpn::udpv4_ev (io_watcher &w, short revents) 399vpn::ipv4_ev (io_watcher &w, short revents)
245{ 400{
246 if (revents & (POLLIN | POLLERR)) 401 if (revents & (POLLIN | POLLERR))
247 { 402 {
248 vpn_packet *pkt = new vpn_packet; 403 vpn_packet *pkt = new vpn_packet;
249 struct sockaddr_in sa; 404 struct sockaddr_in sa;
250 socklen_t sa_len = sizeof (sa); 405 socklen_t sa_len = sizeof (sa);
251 int len; 406 int len;
252 407
253 len = recvfrom (w.fd, &((*pkt)[0]), MAXSIZE, 0, (sockaddr *)&sa, &sa_len); 408 len = recvfrom (w.fd, &((*pkt)[0]), MAXSIZE, 0, (sockaddr *)&sa, &sa_len);
254 409
255 sockinfo si(sa); 410 sockinfo si(sa, PROT_IPv4);
256 411
257 if (len > 0) 412 if (len > 0)
258 { 413 {
259 pkt->len = len; 414 pkt->len = len;
415
416 // raw sockets deliver the ipv4, but don't expect it on sends
417 // this is slow, but...
418 pkt->skip_hdr (IP_OVERHEAD);
260 419
261 recv_vpn_packet (pkt, si); 420 recv_vpn_packet (pkt, si);
262 } 421 }
263 else 422 else
264 { 423 {
… …
269 delete pkt; 428 delete pkt;
270 } 429 }
271 else if (revents & POLLHUP) 430 else if (revents & POLLHUP)
272 { 431 {
273 // this cannot ;) happen on udp sockets 432 // this cannot ;) happen on udp sockets
274 slog (L_ERR, _("FATAL: POLLHUP on udp v4 fd, terminating.")); 433 slog (L_ERR, _("FATAL: POLLHUP on ipv4 fd, terminating."));
275 exit (1); 434 exit (1);
276 } 435 }
277 else 436 else
278 { 437 {
279 slog (L_ERR, 438 slog (L_ERR,
… …
281 revents); 440 revents);
282 exit (1); 441 exit (1);
283 } 442 }
284} 443}
285 444
445#if ENABLE_ICMP
286void 446void
287vpn::ipv4_ev (io_watcher &w, short revents) 447vpn::icmpv4_ev (io_watcher &w, short revents)
288{ 448{
289 if (revents & (POLLIN | POLLERR)) 449 if (revents & (POLLIN | POLLERR))
290 { 450 {
291 vpn_packet *pkt = new vpn_packet; 451 vpn_packet *pkt = new vpn_packet;
292 struct sockaddr_in sa; 452 struct sockaddr_in sa;
293 socklen_t sa_len = sizeof (sa); 453 socklen_t sa_len = sizeof (sa);
294 int len; 454 int len;
295 455
296 len = recvfrom (w.fd, &((*pkt)[0]), MAXSIZE, 0, (sockaddr *)&sa, &sa_len); 456 len = recvfrom (w.fd, &((*pkt)[0]), MAXSIZE, 0, (sockaddr *)&sa, &sa_len);
297 457
298 sockinfo si(sa, PROT_IPv4); 458 sockinfo si(sa, PROT_ICMPv4);
299 459
300 if (len > 0) 460 if (len > 0)
301 { 461 {
302 pkt->len = len; 462 pkt->len = len;
303 463
464 icmp_header *hdr = (icmp_header *)&((*pkt)[IP_OVERHEAD]);
465
466 if (hdr->type == ::conf.icmp_type
467 && hdr->code == 255)
468 {
304 // raw sockets deliver the ipv4, but don't expect it on sends 469 // raw sockets deliver the ipv4, but don't expect it on sends
305 // this is slow, but... 470 // this is slow, but...
306 pkt->skip_hdr (IP_OVERHEAD); 471 pkt->skip_hdr (ICMP_OVERHEAD);
307 472
308 recv_vpn_packet (pkt, si); 473 recv_vpn_packet (pkt, si);
474 }
309 } 475 }
310 else 476 else
311 { 477 {
312 // probably ECONNRESET or somesuch 478 // probably ECONNRESET or somesuch
313 slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno)); 479 slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno));
… …
316 delete pkt; 482 delete pkt;
317 } 483 }
318 else if (revents & POLLHUP) 484 else if (revents & POLLHUP)
319 { 485 {
320 // this cannot ;) happen on udp sockets 486 // this cannot ;) happen on udp sockets
321 slog (L_ERR, _("FATAL: POLLHUP on ipv4 fd, terminating.")); 487 slog (L_ERR, _("FATAL: POLLHUP on icmpv4 fd, terminating."));
322 exit (1); 488 exit (1);
323 } 489 }
324 else 490 else
325 { 491 {
326 slog (L_ERR, 492 slog (L_ERR,
327 _("FATAL: unknown revents %08x in socket, terminating\n"), 493 _("FATAL: unknown revents %08x in socket, terminating\n"),
328 revents); 494 revents);
329 exit (1); 495 exit (1);
330 } 496 }
331} 497}
498#endif
332 499
333#if ENABLE_TCP 500void
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 void tcpv4_ev (io_watcher &w, short revents); 501vpn::udpv4_ev (io_watcher &w, short revents)
362
363 operator tcp_si_map::value_type()
364 {
365 return tcp_si_map::value_type (&si, this);
366 }
367
368 tcp_connection (int fd_, const sockinfo &si_, vpn &v_)
369 : v(v_), si(si_), io_watcher(this, &tcp_connection::tcpv4_ev), ok(false)
370 {
371 last_activity = NOW;
372 start (fd_, POLLOUT);
373 }
374
375 ~tcp_connection () { close (fd); }
376};
377
378void tcp_si_map::cleaner_cb (time_watcher &w)
379{ 502{
380 w.at = NOW + 600;
381 tstamp to = NOW - ::conf.keepalive - 30;
382
383 for (iterator i = begin (); i != end(); )
384 if (i->second->last_activity >= to)
385 ++i;
386 else
387 {
388 erase (i);
389 i = begin ();
390 }
391}
392
393void
394vpn::send_tcpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)
395{
396 tcp_si_map::iterator info = tcp_si.find (&si);
397
398 if (info == tcp_si.end ())
399 {
400 // woaw, the first lost packet ;)
401 int fd = socket (PF_INET, SOCK_STREAM, IPPROTO_TCP);
402
403 if (fd >= 0)
404 {
405 fcntl (fd, F_SETFL, O_NONBLOCK);
406
407 if (connect (fd, si.sav4 (), si.salenv4 ()) >= 0
408 || errno == EINPROGRESS)
409 {
410 tcp_connection *i = new tcp_connection (fd, si, *this);
411
412 tcp_si.insert (*i);
413 }
414 else
415 close (fd);
416 }
417 }
418 else
419 {
420 tcp_connection *i = info->second;
421
422 i->last_activity = NOW;
423
424 if (i->ok)
425 {
426 setsockopt (i->fd, SOL_IP, IP_TOS, &tos, sizeof tos);
427
428 // we use none of the advantages of tcp
429 write (i->fd, (void *)pkt, pkt->len + sizeof (u32)) != pkt->len + sizeof (u32);
430 }
431 }
432
433#if 0
434 setsockopt (udpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);
435 sendto (udpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());
436#endif
437}
438
439void
440tcp_connection::tcpv4_ev (io_watcher &w, short revents)
441{
442 last_activity = NOW;
443
444 if (!ok) // just established?
445 {
446 ok = true;
447 fcntl (fd, F_SETFL, 0);
448 stop ();
449 start (fd, POLLIN);
450 }
451
452 if (revents & (POLLIN | POLLERR)) 503 if (revents & (POLLIN | POLLERR))
453 { 504 {
454 u32 len;
455
456 if (sizeof (len) == read (fd, &len, sizeof (len)))
457 {
458 vpn_packet *pkt = new vpn_packet; 505 vpn_packet *pkt = new vpn_packet;
459
460 if (len == read (fd, &((*pkt)[0]), len))
461 {
462 pkt->len = len;
463
464 v.recv_vpn_packet (pkt, si);
465 return;
466 }
467
468 delete pkt;
469 }
470
471 tcp_si.erase (&si);
472 stop ();
473 }
474}
475
476void
477vpn::tcpv4_ev (io_watcher &w, short revents)
478{
479 if (revents & (POLLIN | POLLERR))
480 {
481 struct sockaddr_in sa; 506 struct sockaddr_in sa;
482 socklen_t sa_len = sizeof (sa); 507 socklen_t sa_len = sizeof (sa);
483 int len; 508 int len;
484 509
485 int fd = accept (w.fd, (sockaddr *)&sa, &sa_len); 510 len = recvfrom (w.fd, &((*pkt)[0]), MAXSIZE, 0, (sockaddr *)&sa, &sa_len);
486 511
487 if (fd >= 0)
488 {
489 fcntl (fd, F_SETFL, O_NONBLOCK);
490
491 sockinfo si(sa, PROT_TCPv4); 512 sockinfo si(sa, PROT_UDPv4);
492 tcp_connection *i = new tcp_connection (fd, si, *this);
493 513
494 slog (L_ERR, "accepted %d\n", fd);//D 514 if (len > 0)
495
496 tcp_si.insert (*i);
497 } 515 {
516 pkt->len = len;
517
518 recv_vpn_packet (pkt, si);
519 }
520 else
521 {
522 // probably ECONNRESET or somesuch
523 slog (L_DEBUG, _("%s: fd %d, %s"), (const char *)si, w.fd, strerror (errno));
524 }
525
526 delete pkt;
527 }
528 else if (revents & POLLHUP)
498 } 529 {
530 // this cannot ;) happen on udp sockets
531 slog (L_ERR, _("FATAL: POLLHUP on udp v4 fd, terminating."));
532 exit (1);
533 }
534 else
535 {
536 slog (L_ERR,
537 _("FATAL: unknown revents %08x in socket, terminating\n"),
538 revents);
539 exit (1);
540 }
499} 541}
500
501#endif
502 542
503void 543void
504vpn::tap_ev (io_watcher &w, short revents) 544vpn::tap_ev (io_watcher &w, short revents)
505{ 545{
506 if (revents & POLLIN) 546 if (revents & POLLIN)
… …
508 /* process data */ 548 /* process data */
509 tap_packet *pkt; 549 tap_packet *pkt;
510 550
511 pkt = tap->recv (); 551 pkt = tap->recv ();
512 552
553 if (!pkt)
554 return;
555
556 if (pkt->len > 14)
557 {
513 int dst = mac2id (pkt->dst); 558 int dst = mac2id (pkt->dst);
514 int src = mac2id (pkt->src); 559 int src = mac2id (pkt->src);
515 560
516 if (src != THISNODE->id) 561 if (src != THISNODE->id)
517 {
518 slog (L_ERR, _("FATAL: tap packet not originating on current node received, terminating."));
519 exit (1);
520 }
521
522 if (dst == THISNODE->id)
523 {
524 slog (L_ERR, _("FATAL: tap packet destined for current node received, terminating."));
525 exit (1);
526 }
527
528 if (dst > conns.size ())
529 slog (L_ERR, _("tap packet for unknown node %d received, ignoring."), dst);
530 else
531 {
532 if (dst)
533 { 562 {
534 // unicast 563 slog (L_ERR, _("FATAL: tap packet not originating on current node received, exiting."));
535 if (dst != THISNODE->id) 564 exit (1);
536 conns[dst - 1]->inject_data_packet (pkt);
537 } 565 }
566
567 if (dst == THISNODE->id)
568 {
569 slog (L_ERR, _("FATAL: tap packet destined for current node received, exiting."));
570 exit (1);
571 }
572
573 if (dst > conns.size ())
574 slog (L_ERR, _("tap packet for unknown node %d received, ignoring."), dst);
538 else 575 else
539 {
540 // broadcast, first check router, then self, then english
541 connection *router = find_router ();
542
543 if (router)
544 router->inject_data_packet (pkt, true); 576 inject_data_packet (pkt, dst);
545 else
546 for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)
547 if ((*c)->conf != THISNODE)
548 (*c)->inject_data_packet (pkt);
549 }
550 } 577 }
551 578
552 delete pkt; 579 delete pkt;
553 } 580 }
554 else if (revents & (POLLHUP | POLLERR)) 581 else if (revents & (POLLHUP | POLLERR))
… …
620 } 647 }
621} 648}
622 649
623connection *vpn::find_router () 650connection *vpn::find_router ()
624{ 651{
625 u32 prio = 0; 652 u32 prio = 1;
626 connection *router = 0; 653 connection *router = 0;
627 654
628 for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i) 655 for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)
629 { 656 {
630 connection *c = *i; 657 connection *c = *i;
631 658
632 if (c->conf->routerprio > prio 659 if (c->conf->routerprio > prio
633 && c->connectmode == conf_node::C_ALWAYS 660 && c->connectmode == conf_node::C_ALWAYS // so we don't drop the connection if in use
634 && c->conf != THISNODE
635 && c->ictx && c->octx) 661 && c->ictx && c->octx
662 && c->conf != THISNODE) // redundant, since ictx==octx==0 always on thisnode
636 { 663 {
637 prio = c->conf->routerprio; 664 prio = c->conf->routerprio;
638 router = c; 665 router = c;
639 } 666 }
640 } 667 }
641 668
642 return router; 669 return router;
643} 670}
644 671
645void vpn::connect_request (int id) 672void vpn::send_connect_request (int id)
646{ 673{
647 connection *c = find_router (); 674 connection *c = find_router ();
648 675
649 if (c) 676 if (c)
650 c->connect_request (id); 677 c->send_connect_request (id);
651 //else // does not work, because all others must connect to the same router 678 else
652 // // no router found, aggressively connect to all routers 679 // no router found, aggressively connect to all routers
653 // for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i) 680 for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)
654 // if ((*i)->conf->routerprio) 681 if ((*i)->conf->routerprio && (*i)->conf != THISNODE)
655 // (*i)->establish_connection (); 682 (*i)->establish_connection ();
656} 683}
657 684
658void 685void
659connection::dump_status () 686connection::dump_status ()
660{ 687{
… …
677 704
678 slog (L_NOTICE, _("END status dump")); 705 slog (L_NOTICE, _("END status dump"));
679} 706}
680 707
681vpn::vpn (void) 708vpn::vpn (void)
682: event(this, &vpn::event_cb) 709: event (this, &vpn::event_cb)
683, udpv4_ev_watcher(this, &vpn::udpv4_ev) 710, udpv4_ev_watcher (this, &vpn::udpv4_ev)
684, ipv4_ev_watcher (this, &vpn::ipv4_ev) 711, ipv4_ev_watcher (this, &vpn::ipv4_ev)
685, tap_ev_watcher (this, &vpn::tap_ev)
686#if ENABLE_TCP 712#if ENABLE_TCP
687, tcpv4_ev_watcher(this, &vpn::tcpv4_ev) 713, tcpv4_ev_watcher (this, &vpn::tcpv4_ev)
688#endif 714#endif
715#if ENABLE_ICMP
716, icmpv4_ev_watcher(this, &vpn::icmpv4_ev)
717#endif
718, tap_ev_watcher (this, &vpn::tap_ev)
689{ 719{
690} 720}
691 721
692vpn::~vpn () 722vpn::~vpn ()
693{ 723{

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