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Comparing gvpe/src/vpn.C (file contents):
Revision 1.2 by pcg, Wed Apr 2 05:15:00 2003 UTC vs.
Revision 1.6 by pcg, Sun Apr 6 04:17:36 2003 UTC

… …
38 38
39#include "connection.h" 39#include "connection.h"
40#include "util.h" 40#include "util.h"
41#include "vpn.h" 41#include "vpn.h"
42 42
43#if ENABLE_TCP
44# include <map>
45# include <unistd.h>
46# include <fcntl.h>
47# include <sys/poll.h>
48#endif
49
50///////////////////////////////////////////////////////////////////////////// 43/////////////////////////////////////////////////////////////////////////////
51 44
52const char *vpn::script_if_up () 45const char *vpn::script_if_up ()
53{ 46{
54 // the tunnel device mtu should be the physical mtu - overhead 47 // the tunnel device mtu should be the physical mtu - overhead
… …
87 udpv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP); 80 udpv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP);
88 81
89 if (udpv4_fd < 0) 82 if (udpv4_fd < 0)
90 return -1; 83 return -1;
91 84
85 // standard daemon practise...
86 {
87 int oval = 1;
88 setsockopt (udpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);
89 }
90
92 sockinfo si (THISNODE, PROT_UDPv4); 91 sockinfo si (THISNODE, PROT_UDPv4);
93 92
94 if (bind (udpv4_fd, si.sav4 (), si.salenv4 ())) 93 if (bind (udpv4_fd, si.sav4 (), si.salenv4 ()))
95 { 94 {
96 slog (L_ERR, _("can't bind udpv4 on %s: %s"), (const char *)si, strerror (errno)); 95 slog (L_ERR, _("can't bind udpv4 on %s: %s"), (const char *)si, strerror (errno));
… …
105 int oval = IP_PMTUDISC_DONT; 104 int oval = IP_PMTUDISC_DONT;
106 setsockopt (udpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval); 105 setsockopt (udpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);
107 } 106 }
108#endif 107#endif
109 108
110 // standard daemon practise...
111 {
112 int oval = 1;
113 setsockopt (udpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);
114 }
115
116 udpv4_ev_watcher.start (udpv4_fd, POLLIN); 109 udpv4_ev_watcher.start (udpv4_fd, POLLIN);
117 } 110 }
118 111
119 ipv4_fd = -1; 112 ipv4_fd = -1;
120 if (THISNODE->protocols & PROT_IPv4) 113 if (THISNODE->protocols & PROT_IPv4)
… …
151 tcpv4_fd = socket (PF_INET, SOCK_STREAM, IPPROTO_TCP); 144 tcpv4_fd = socket (PF_INET, SOCK_STREAM, IPPROTO_TCP);
152 145
153 if (tcpv4_fd < 0) 146 if (tcpv4_fd < 0)
154 return -1; 147 return -1;
155 148
156 sockinfo si (THISNODE, PROT_TCPv4);
157
158 if (bind (tcpv4_fd, si.sav4 (), si.salenv4 ()))
159 {
160 slog (L_ERR, _("can't bind tcpv4 on %s: %s"), (const char *)si, strerror (errno));
161 exit (1);
162 }
163
164 if (listen (tcpv4_fd, 5))
165 {
166 slog (L_ERR, _("can't listen tcpv4 on %s: %s"), (const char *)si, strerror (errno));
167 exit (1);
168 }
169
170 // standard daemon practise... 149 // standard daemon practise...
171 { 150 {
172 int oval = 1; 151 int oval = 1;
173 setsockopt (tcpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval); 152 setsockopt (tcpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);
174 } 153 }
175 154
155 sockinfo si (THISNODE, PROT_TCPv4);
156
157 if (bind (tcpv4_fd, si.sav4 (), si.salenv4 ()))
158 {
159 slog (L_ERR, _("can't bind tcpv4 on %s: %s"), (const char *)si, strerror (errno));
160 exit (1);
161 }
162
163 if (listen (tcpv4_fd, 5))
164 {
165 slog (L_ERR, _("can't listen tcpv4 on %s: %s"), (const char *)si, strerror (errno));
166 exit (1);
167 }
168
176 tcpv4_accept_watcher.start (tcpv4_fd, POLLIN); 169 tcpv4_ev_watcher.start (tcpv4_fd, POLLIN);
177 } 170 }
178#endif 171#endif
179 172
180 tap = new tap_device (); 173 tap = new tap_device ();
181 if (!tap) //D this, of course, never catches 174 if (!tap) //D this, of course, never catches
… …
189 tap_ev_watcher.start (tap->fd, POLLIN); 182 tap_ev_watcher.start (tap->fd, POLLIN);
190 183
191 reconnect_all (); 184 reconnect_all ();
192 185
193 return 0; 186 return 0;
187}
188
189// send a vpn packet out to other hosts
190void
191vpn::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos)
192{
193 switch (si.prot)
194 {
195 case PROT_IPv4:
196 send_ipv4_packet (pkt, si, tos);
197 break;
198
199 case PROT_UDPv4:
200 send_udpv4_packet (pkt, si, tos);
201 break;
202
203#if ENABLE_TCP
204 case PROT_TCPv4:
205 send_tcpv4_packet (pkt, si, tos);
206 break;
207#endif
208
209 default:
210 slog (L_CRIT, _("%s: FATAL: trying to send packet with unsupported protocol"), (const char *)si);
211 abort ();
212 }
194} 213}
195 214
196void 215void
197vpn::send_ipv4_packet (vpn_packet *pkt, const sockinfo &si, int tos) 216vpn::send_ipv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)
198{ 217{
… …
219 if (src == 0 || src > conns.size () 238 if (src == 0 || src > conns.size ()
220 || dst > conns.size () 239 || dst > conns.size ()
221 || pkt->typ () >= vpn_packet::PT_MAX) 240 || pkt->typ () >= vpn_packet::PT_MAX)
222 slog (L_WARN, _("(%s): received corrupted packet type %d (src %d, dst %d)"), 241 slog (L_WARN, _("(%s): received corrupted packet type %d (src %d, dst %d)"),
223 (const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ()); 242 (const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ());
243 else if (dst > conns.size ())
244 slog (L_WARN, _("(%s): received corrupted packet type %d (src %d, dst %d)"),
245 (const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ());
224 else 246 else
225 { 247 {
226 connection *c = conns[src - 1]; 248 connection *c = conns[src - 1];
227 249
228 if (dst == 0 && !THISNODE->routerprio) 250 if (dst == 0 && !THISNODE->routerprio)
229 slog (L_WARN, _("%s(%s): received broadcast, but we are no router"), 251 slog (L_WARN, _("%s(%s): received broadcast, but we are no router"),
230 c->conf->nodename, (const char *)rsi); 252 c->conf->nodename, (const char *)rsi);
231 else if (dst != 0 && dst != THISNODE->id) 253 else if (dst != 0 && dst != THISNODE->id)
232 // FORWARDING NEEDED ;) 254 {
255 if (THISNODE->routerprio)
256 // the tos setting gets lost here. who cares.
257 conns[dst - 1]->inject_vpn_packet (pkt);
258 else
233 slog (L_WARN, 259 slog (L_WARN,
234 _("received frame for node %d ('%s') from %s, but this is node %d ('%s')"), 260 _("%s(%s): forwarding request (=> %s), but we are no router"),
261 c->conf->nodename, (const char *)rsi,
235 dst, conns[dst - 1]->conf->nodename, 262 conns[dst - 1]->conf->nodename);
236 (const char *)rsi, 263 }
237 THISNODE->id, THISNODE->nodename);
238 else 264 else
239 c->recv_vpn_packet (pkt, rsi); 265 c->recv_vpn_packet (pkt, rsi);
240 } 266 }
241} 267}
242 268
243void 269void
244vpn::udpv4_ev (int fd, short revents) 270vpn::udpv4_ev (io_watcher &w, short revents)
245{ 271{
246 if (revents & (POLLIN | POLLERR)) 272 if (revents & (POLLIN | POLLERR))
247 { 273 {
248 vpn_packet *pkt = new vpn_packet; 274 vpn_packet *pkt = new vpn_packet;
249 struct sockaddr_in sa; 275 struct sockaddr_in sa;
250 socklen_t sa_len = sizeof (sa); 276 socklen_t sa_len = sizeof (sa);
251 int len; 277 int len;
252 278
253 len = recvfrom (fd, &((*pkt)[0]), MAXSIZE, 0, (sockaddr *)&sa, &sa_len); 279 len = recvfrom (w.fd, &((*pkt)[0]), MAXSIZE, 0, (sockaddr *)&sa, &sa_len);
254 280
255 sockinfo si(sa); 281 sockinfo si(sa, PROT_UDPv4);
256 282
257 if (len > 0) 283 if (len > 0)
258 { 284 {
259 pkt->len = len; 285 pkt->len = len;
260 286
261 recv_vpn_packet (pkt, si); 287 recv_vpn_packet (pkt, si);
262 } 288 }
263 else 289 else
264 { 290 {
265 // probably ECONNRESET or somesuch 291 // probably ECONNRESET or somesuch
266 slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno)); 292 slog (L_DEBUG, _("%s: fd %d, %s"), (const char *)si, w.fd, strerror (errno));
267 } 293 }
268 294
269 delete pkt; 295 delete pkt;
270 } 296 }
271 else if (revents & POLLHUP) 297 else if (revents & POLLHUP)
… …
282 exit (1); 308 exit (1);
283 } 309 }
284} 310}
285 311
286void 312void
287vpn::ipv4_ev (int fd, short revents) 313vpn::ipv4_ev (io_watcher &w, short revents)
288{ 314{
289 if (revents & (POLLIN | POLLERR)) 315 if (revents & (POLLIN | POLLERR))
290 { 316 {
291 vpn_packet *pkt = new vpn_packet; 317 vpn_packet *pkt = new vpn_packet;
292 struct sockaddr_in sa; 318 struct sockaddr_in sa;
293 socklen_t sa_len = sizeof (sa); 319 socklen_t sa_len = sizeof (sa);
294 int len; 320 int len;
295 321
296 len = recvfrom (fd, &((*pkt)[0]), MAXSIZE, 0, (sockaddr *)&sa, &sa_len); 322 len = recvfrom (w.fd, &((*pkt)[0]), MAXSIZE, 0, (sockaddr *)&sa, &sa_len);
297 323
298 sockinfo si(sa, PROT_IPv4); 324 sockinfo si(sa, PROT_IPv4);
299 325
300 if (len > 0) 326 if (len > 0)
301 { 327 {
… …
328 revents); 354 revents);
329 exit (1); 355 exit (1);
330 } 356 }
331} 357}
332 358
333#if ENABLE_TCP
334
335struct tcp_info {
336 int fd;
337 bool ok;
338 io_watcher r;
339
340 tcp_info (vpn *v)
341 : r(v, &vpn::tcpv4_ev)
342 {
343 fd = -1;
344 }
345
346 ~tcp_info () { close (fd); }
347};
348
349typedef map<sockinfo, tcp_info *> tcp_si_map;
350typedef map<int, tcp_info *> tcp_fd_map; // unneecssary if iom would be cooler
351static tcp_si_map tcp_si;
352static tcp_fd_map tcp_fd;
353
354void 359void
355vpn::send_tcpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)
356{
357 tcp_si_map::iterator info = tcp_si.find (si);
358
359 if (info == tcp_si.end ())
360 {
361 // woaw, the first lost packet ;)
362 tcp_info *i = new tcp_info (this);
363
364 i->ok = false;
365 i->fd = socket (PF_INET, SOCK_STREAM, IPPROTO_TCP);
366
367 if (i->fd >= 0)
368 {
369 fcntl (i->fd, F_SETFL, O_NONBLOCK);
370
371 if (connect (i->fd, si.sav4 (), si.salenv4 ()) >= 0
372 || errno == EINPROGRESS)
373 {
374 tcp_si.insert (tcp_si_map::value_type (si, i));
375 tcp_fd.insert (tcp_fd_map::value_type (i->fd, i));
376 return;
377 }
378
379 delete i;
380 }
381 }
382 else
383 {
384 tcp_info *i = info->second;
385
386 if (i->ok)
387 {
388 setsockopt (i->fd, SOL_IP, IP_TOS, &tos, sizeof tos);
389
390 if (write (i->fd, (void *)pkt, pkt->len + sizeof (u32)) != pkt->len + sizeof (u32))
391 {
392 // error, close socket, forget it and retry immediately
393 tcp_si.erase (info);
394 tcp_fd.erase (i->fd);
395 delete i;
396
397 // tail recursion is... better than goto(?)
398 send_tcpv4_packet (pkt, si, tos);
399 }
400 }
401 }
402
403#if 0
404 setsockopt (udpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);
405 sendto (udpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());
406#endif
407}
408
409void
410vpn::tcpv4_accept (int fd, short revents)
411{
412 if (revents & (POLLIN | POLLERR))
413 {
414 struct sockaddr_in sa;
415 socklen_t sa_len = sizeof (sa);
416 int len;
417
418 fd = accept (fd, (sockaddr *)&sa, &sa_len);
419
420 if (fd >= 0)
421 {
422 fcntl (fd, F_SETFL, O_NONBLOCK);
423
424 sockinfo si(sa, PROT_TCPv4);
425 tcp_info *i = new tcp_info (this);
426
427 i->fd = fd;
428 i->ok = true;
429 i->r.start (fd, POLLIN);
430
431 tcp_si.insert (tcp_si_map::value_type (si, i));
432 tcp_fd.insert (tcp_fd_map::value_type (fd, i));
433 }
434 }
435}
436
437void
438vpn::tcpv4_ev (int fd, short revents)
439{
440 if (revents & (POLLIN | POLLERR))
441 {
442 tcp_fd_map::iterator info = tcp_fd.find (fd);
443
444 if (info != tcp_fd.end ())
445 {
446 tcp_info *i = info->second;
447
448 if (!i->ok) // not yet established
449 {
450 i->ok = true;
451 fcntl (i->fd, F_SETFL, 0);
452 }
453
454 u32 len;
455
456 if (sizeof (len) == read (fd, &len, sizeof (len)))
457 {
458 slog (L_ERR, "%d bytes received\n", len);
459 }
460
461 //tcp_si.erase (i);
462 tcp_fd.erase (fd);
463 delete i;
464 }
465 }
466}
467
468#endif
469
470void
471vpn::tap_ev (int fd, short revents) 360vpn::tap_ev (io_watcher &w, short revents)
472{ 361{
473 if (revents & POLLIN) 362 if (revents & POLLIN)
474 { 363 {
475 /* process data */ 364 /* process data */
476 tap_packet *pkt; 365 tap_packet *pkt;
… …
526 else 415 else
527 abort (); 416 abort ();
528} 417}
529 418
530void 419void
531vpn::event_cb (tstamp &ts) 420vpn::event_cb (time_watcher &w)
532{ 421{
533 if (events) 422 if (events)
534 { 423 {
535 if (events & EVENT_SHUTDOWN) 424 if (events & EVENT_SHUTDOWN)
536 { 425 {
… …
553 } 442 }
554 443
555 events = 0; 444 events = 0;
556 } 445 }
557 446
558 ts = TSTAMP_CANCEL; 447 w.at = TSTAMP_CANCEL;
559} 448}
560 449
561void 450void
562vpn::shutdown_all () 451vpn::shutdown_all ()
563{ 452{
… …
649: event(this, &vpn::event_cb) 538: event(this, &vpn::event_cb)
650, udpv4_ev_watcher(this, &vpn::udpv4_ev) 539, udpv4_ev_watcher(this, &vpn::udpv4_ev)
651, ipv4_ev_watcher (this, &vpn::ipv4_ev) 540, ipv4_ev_watcher (this, &vpn::ipv4_ev)
652, tap_ev_watcher (this, &vpn::tap_ev) 541, tap_ev_watcher (this, &vpn::tap_ev)
653#if ENABLE_TCP 542#if ENABLE_TCP
654, tcpv4_accept_watcher(this, &vpn::tcpv4_accept) 543, tcpv4_ev_watcher(this, &vpn::tcpv4_ev)
655#endif 544#endif
656{ 545{
657} 546}
658 547
659vpn::~vpn () 548vpn::~vpn ()

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