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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 1.8 by pcg, Mon Apr 7 01:28:56 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
… …
78} 71}
79 72
80int 73int
81vpn::setup () 74vpn::setup ()
82{ 75{
76 ipv4_fd = -1;
77
78 if (THISNODE->protocols & PROT_IPv4 && ::conf.ip_proto)
79 {
80 ipv4_fd = socket (PF_INET, SOCK_RAW, ::conf.ip_proto);
81
82 if (ipv4_fd < 0)
83 return -1;
84
85 sockinfo si (THISNODE, PROT_IPv4);
86
87 if (bind (ipv4_fd, si.sav4 (), si.salenv4 ()))
88 {
89 slog (L_ERR, _("can't bind ipv4 socket on %s: %s"), (const char *)si, strerror (errno));
90 exit (1);
91 }
92
93#ifdef IP_MTU_DISCOVER
94 // this I really consider a linux bug. I am neither connected
95 // nor do I fragment myself. Linux still sets DF and doesn't
96 // fragment for me sometimes.
97 {
98 int oval = IP_PMTUDISC_DONT;
99 setsockopt (ipv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);
100 }
101#endif
102
103 ipv4_ev_watcher.start (ipv4_fd, POLLIN);
104 }
105
83 udpv4_fd = -1; 106 udpv4_fd = -1;
84 107
85 if (THISNODE->protocols & PROT_UDPv4) 108 if (THISNODE->protocols & PROT_UDPv4 && THISNODE->udp_port)
86 { 109 {
87 udpv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP); 110 udpv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP);
88 111
89 if (udpv4_fd < 0) 112 if (udpv4_fd < 0)
90 return -1; 113 return -1;
114
115 // standard daemon practise...
116 {
117 int oval = 1;
118 setsockopt (udpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);
119 }
91 120
92 sockinfo si (THISNODE, PROT_UDPv4); 121 sockinfo si (THISNODE, PROT_UDPv4);
93 122
94 if (bind (udpv4_fd, si.sav4 (), si.salenv4 ())) 123 if (bind (udpv4_fd, si.sav4 (), si.salenv4 ()))
95 { 124 {
… …
105 int oval = IP_PMTUDISC_DONT; 134 int oval = IP_PMTUDISC_DONT;
106 setsockopt (udpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval); 135 setsockopt (udpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);
107 } 136 }
108#endif 137#endif
109 138
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); 139 udpv4_ev_watcher.start (udpv4_fd, POLLIN);
117 } 140 }
118 141
119 ipv4_fd = -1; 142 tcpv4_fd = -1;
120 if (THISNODE->protocols & PROT_IPv4)
121 {
122 ipv4_fd = socket (PF_INET, SOCK_RAW, ::conf.ip_proto);
123
124 if (ipv4_fd < 0)
125 return -1;
126
127 sockinfo si (THISNODE, PROT_IPv4);
128
129 if (bind (ipv4_fd, si.sav4 (), si.salenv4 ()))
130 {
131 slog (L_ERR, _("can't bind ipv4 socket on %s: %s"), (const char *)si, strerror (errno));
132 exit (1);
133 }
134
135#ifdef IP_MTU_DISCOVER
136 // this I really consider a linux bug. I am neither connected
137 // nor do I fragment myself. Linux still sets DF and doesn't
138 // fragment for me sometimes.
139 {
140 int oval = IP_PMTUDISC_DONT;
141 setsockopt (ipv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);
142 }
143#endif
144
145 ipv4_ev_watcher.start (ipv4_fd, POLLIN);
146 }
147 143
148#if ENABLE_TCP 144#if ENABLE_TCP
149 if (THISNODE->protocols & PROT_TCPv4) 145 if (THISNODE->protocols & PROT_TCPv4 && THISNODE->tcp_port)
150 { 146 {
151 tcpv4_fd = socket (PF_INET, SOCK_STREAM, IPPROTO_TCP); 147 tcpv4_fd = socket (PF_INET, SOCK_STREAM, IPPROTO_TCP);
152 148
153 if (tcpv4_fd < 0) 149 if (tcpv4_fd < 0)
154 return -1; 150 return -1;
155
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 }
169 151
170 // standard daemon practise... 152 // standard daemon practise...
171 { 153 {
172 int oval = 1; 154 int oval = 1;
173 setsockopt (tcpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval); 155 setsockopt (tcpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);
174 } 156 }
175 157
158 sockinfo si (THISNODE, PROT_TCPv4);
159
160 if (bind (tcpv4_fd, si.sav4 (), si.salenv4 ()))
161 {
162 slog (L_ERR, _("can't bind tcpv4 on %s: %s"), (const char *)si, strerror (errno));
163 exit (1);
164 }
165
166 if (listen (tcpv4_fd, 5))
167 {
168 slog (L_ERR, _("can't listen tcpv4 on %s: %s"), (const char *)si, strerror (errno));
169 exit (1);
170 }
171
176 tcpv4_accept_watcher.start (tcpv4_fd, POLLIN); 172 tcpv4_ev_watcher.start (tcpv4_fd, POLLIN);
177 } 173 }
178#endif 174#endif
179 175
180 tap = new tap_device (); 176 tap = new tap_device ();
181 if (!tap) //D this, of course, never catches 177 if (!tap) //D this, of course, never catches
… …
191 reconnect_all (); 187 reconnect_all ();
192 188
193 return 0; 189 return 0;
194} 190}
195 191
196void 192// send a vpn packet out to other hosts
193bool
194vpn::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos)
195{
196 switch (si.prot)
197 {
198 case PROT_IPv4:
199 return send_ipv4_packet (pkt, si, tos);
200
201 case PROT_UDPv4:
202 return send_udpv4_packet (pkt, si, tos);
203
204#if ENABLE_TCP
205 case PROT_TCPv4:
206 return send_tcpv4_packet (pkt, si, tos);
207#endif
208
209 default:
210 slog (L_CRIT, _("%s: FATAL: trying to send packet with unsupported protocol"), (const char *)si);
211 return false;
212 }
213}
214
215bool
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{
199 setsockopt (ipv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos); 218 setsockopt (ipv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);
200 sendto (ipv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ()); 219 sendto (ipv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());
201}
202 220
203void 221 return true;
222}
223
224bool
204vpn::send_udpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos) 225vpn::send_udpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)
205{ 226{
206 setsockopt (udpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos); 227 setsockopt (udpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);
207 sendto (udpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ()); 228 sendto (udpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());
229
230 return true;
208} 231}
209 232
210void 233void
211vpn::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi) 234vpn::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)
212{ 235{
… …
219 if (src == 0 || src > conns.size () 242 if (src == 0 || src > conns.size ()
220 || dst > conns.size () 243 || dst > conns.size ()
221 || pkt->typ () >= vpn_packet::PT_MAX) 244 || pkt->typ () >= vpn_packet::PT_MAX)
222 slog (L_WARN, _("(%s): received corrupted packet type %d (src %d, dst %d)"), 245 slog (L_WARN, _("(%s): received corrupted packet type %d (src %d, dst %d)"),
223 (const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ()); 246 (const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ());
247 else if (dst > conns.size ())
248 slog (L_WARN, _("(%s): received corrupted packet type %d (src %d, dst %d)"),
249 (const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ());
224 else 250 else
225 { 251 {
226 connection *c = conns[src - 1]; 252 connection *c = conns[src - 1];
227 253
228 if (dst == 0 && !THISNODE->routerprio) 254 if (dst == 0 && !THISNODE->routerprio)
229 slog (L_WARN, _("%s(%s): received broadcast, but we are no router"), 255 slog (L_WARN, _("%s(%s): received broadcast, but we are no router"),
230 c->conf->nodename, (const char *)rsi); 256 c->conf->nodename, (const char *)rsi);
231 else if (dst != 0 && dst != THISNODE->id) 257 else if (dst != 0 && dst != THISNODE->id)
232 // FORWARDING NEEDED ;) 258 {
259 if (THISNODE->routerprio)
260 // the tos setting gets lost here. who cares.
261 conns[dst - 1]->inject_vpn_packet (pkt);
262 else
233 slog (L_WARN, 263 slog (L_WARN,
234 _("received frame for node %d ('%s') from %s, but this is node %d ('%s')"), 264 _("%s(%s): forwarding request (=> %s), but we are no router"),
265 c->conf->nodename, (const char *)rsi,
235 dst, conns[dst - 1]->conf->nodename, 266 conns[dst - 1]->conf->nodename);
236 (const char *)rsi, 267 }
237 THISNODE->id, THISNODE->nodename);
238 else 268 else
239 c->recv_vpn_packet (pkt, rsi); 269 c->recv_vpn_packet (pkt, rsi);
240 } 270 }
241} 271}
242 272
243void 273void
244vpn::udpv4_ev (int fd, short revents) 274vpn::udpv4_ev (io_watcher &w, short revents)
245{ 275{
246 if (revents & (POLLIN | POLLERR)) 276 if (revents & (POLLIN | POLLERR))
247 { 277 {
248 vpn_packet *pkt = new vpn_packet; 278 vpn_packet *pkt = new vpn_packet;
249 struct sockaddr_in sa; 279 struct sockaddr_in sa;
250 socklen_t sa_len = sizeof (sa); 280 socklen_t sa_len = sizeof (sa);
251 int len; 281 int len;
252 282
253 len = recvfrom (fd, &((*pkt)[0]), MAXSIZE, 0, (sockaddr *)&sa, &sa_len); 283 len = recvfrom (w.fd, &((*pkt)[0]), MAXSIZE, 0, (sockaddr *)&sa, &sa_len);
254 284
255 sockinfo si(sa); 285 sockinfo si(sa, PROT_UDPv4);
256 286
257 if (len > 0) 287 if (len > 0)
258 { 288 {
259 pkt->len = len; 289 pkt->len = len;
260 290
261 recv_vpn_packet (pkt, si); 291 recv_vpn_packet (pkt, si);
262 } 292 }
263 else 293 else
264 { 294 {
265 // probably ECONNRESET or somesuch 295 // probably ECONNRESET or somesuch
266 slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno)); 296 slog (L_DEBUG, _("%s: fd %d, %s"), (const char *)si, w.fd, strerror (errno));
267 } 297 }
268 298
269 delete pkt; 299 delete pkt;
270 } 300 }
271 else if (revents & POLLHUP) 301 else if (revents & POLLHUP)
… …
282 exit (1); 312 exit (1);
283 } 313 }
284} 314}
285 315
286void 316void
287vpn::ipv4_ev (int fd, short revents) 317vpn::ipv4_ev (io_watcher &w, short revents)
288{ 318{
289 if (revents & (POLLIN | POLLERR)) 319 if (revents & (POLLIN | POLLERR))
290 { 320 {
291 vpn_packet *pkt = new vpn_packet; 321 vpn_packet *pkt = new vpn_packet;
292 struct sockaddr_in sa; 322 struct sockaddr_in sa;
293 socklen_t sa_len = sizeof (sa); 323 socklen_t sa_len = sizeof (sa);
294 int len; 324 int len;
295 325
296 len = recvfrom (fd, &((*pkt)[0]), MAXSIZE, 0, (sockaddr *)&sa, &sa_len); 326 len = recvfrom (w.fd, &((*pkt)[0]), MAXSIZE, 0, (sockaddr *)&sa, &sa_len);
297 327
298 sockinfo si(sa, PROT_IPv4); 328 sockinfo si(sa, PROT_IPv4);
299 329
300 if (len > 0) 330 if (len > 0)
301 { 331 {
… …
328 revents); 358 revents);
329 exit (1); 359 exit (1);
330 } 360 }
331} 361}
332 362
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 363void
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) 364vpn::tap_ev (io_watcher &w, short revents)
472{ 365{
473 if (revents & POLLIN) 366 if (revents & POLLIN)
474 { 367 {
475 /* process data */ 368 /* process data */
476 tap_packet *pkt; 369 tap_packet *pkt;
… …
526 else 419 else
527 abort (); 420 abort ();
528} 421}
529 422
530void 423void
531vpn::event_cb (tstamp &ts) 424vpn::event_cb (time_watcher &w)
532{ 425{
533 if (events) 426 if (events)
534 { 427 {
535 if (events & EVENT_SHUTDOWN) 428 if (events & EVENT_SHUTDOWN)
536 { 429 {
… …
553 } 446 }
554 447
555 events = 0; 448 events = 0;
556 } 449 }
557 450
558 ts = TSTAMP_CANCEL; 451 w.at = TSTAMP_CANCEL;
559} 452}
560 453
561void 454void
562vpn::shutdown_all () 455vpn::shutdown_all ()
563{ 456{
… …
607 } 500 }
608 501
609 return router; 502 return router;
610} 503}
611 504
612void vpn::connect_request (int id) 505void vpn::send_connect_request (int id)
613{ 506{
614 connection *c = find_router (); 507 connection *c = find_router ();
615 508
616 if (c) 509 if (c)
617 c->connect_request (id); 510 c->send_connect_request (id);
618 //else // does not work, because all others must connect to the same router 511 else
619 // // no router found, aggressively connect to all routers 512 // no router found, aggressively connect to all routers
620 // for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i) 513 for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)
621 // if ((*i)->conf->routerprio) 514 if ((*i)->conf->routerprio)
622 // (*i)->establish_connection (); 515 (*i)->establish_connection ();
623} 516}
624 517
625void 518void
626connection::dump_status () 519connection::dump_status ()
627{ 520{
… …
649: event(this, &vpn::event_cb) 542: event(this, &vpn::event_cb)
650, udpv4_ev_watcher(this, &vpn::udpv4_ev) 543, udpv4_ev_watcher(this, &vpn::udpv4_ev)
651, ipv4_ev_watcher (this, &vpn::ipv4_ev) 544, ipv4_ev_watcher (this, &vpn::ipv4_ev)
652, tap_ev_watcher (this, &vpn::tap_ev) 545, tap_ev_watcher (this, &vpn::tap_ev)
653#if ENABLE_TCP 546#if ENABLE_TCP
654, tcpv4_accept_watcher(this, &vpn::tcpv4_accept) 547, tcpv4_ev_watcher(this, &vpn::tcpv4_ev)
655#endif 548#endif
656{ 549{
657} 550}
658 551
659vpn::~vpn () 552vpn::~vpn ()

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