ViewVC Help
View File | Revision Log | Show Annotations | Download File
/cvs/gvpe/src/vpn.C
(Generate patch)

Comparing gvpe/src/vpn.C (file contents):
Revision 1.2 by pcg, Wed Apr 2 05:15:00 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;
91 118
92 sockinfo si (THISNODE, PROT_UDPv4); 119 fcntl (udpv4_fd, F_SETFL, O_NONBLOCK);
93 120
94 if (bind (udpv4_fd, si.sav4 (), si.salenv4 ())) 121 // standard daemon practise...
95 { 122 {
96 slog (L_ERR, _("can't bind udpv4 on %s: %s"), (const char *)si, strerror (errno)); 123 int oval = 1;
97 exit (1); 124 setsockopt (udpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);
98 } 125 }
99 126
100#ifdef IP_MTU_DISCOVER 127#if defined(SOL_IP) && defined(IP_MTU_DISCOVER)
101 // this I really consider a linux bug. I am neither connected 128 // this I really consider a linux bug. I am neither connected
102 // 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
103 // fragment for me sometimes. 130 // fragment for me sometimes.
104 { 131 {
105 int oval = IP_PMTUDISC_DONT; 132 int oval = IP_PMTUDISC_DONT;
106 setsockopt (udpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval); 133 setsockopt (udpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);
107 } 134 }
108#endif 135#endif
109 136
110 // standard daemon practise... 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
145 udpv4_ev_watcher.start (udpv4_fd, POLLIN);
146 }
147
148 icmpv4_fd = -1;
149
150#if ENABLE_ICMP
151 if (THISNODE->protocols & PROT_ICMPv4)
152 {
153 icmpv4_fd = socket (PF_INET, SOCK_RAW, IPPROTO_ICMP);
154
155 if (icmpv4_fd < 0)
156 return -1;
157
158 fcntl (icmpv4_fd, F_SETFL, O_NONBLOCK);
159
160#ifdef ICMP_FILTER
111 { 161 {
112 int oval = 1; 162 icmp_filter oval;
163 oval.data = 0xffffffff;
164 if (::conf.icmp_type < 32)
165 oval.data &= ~(1 << ::conf.icmp_type);
166
113 setsockopt (udpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval); 167 setsockopt (icmpv4_fd, SOL_RAW, ICMP_FILTER, &oval, sizeof oval);
114 } 168 }
169#endif
115 170
116 udpv4_ev_watcher.start (udpv4_fd, POLLIN); 171#if defined(SOL_IP) && defined(IP_MTU_DISCOVER)
117 }
118
119 ipv4_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 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;
155 202
156 sockinfo si (THISNODE, PROT_TCPv4); 203 fcntl (tcpv4_fd, F_SETFL, O_NONBLOCK);
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 }
169 204
170 // standard daemon practise... 205 // standard daemon practise...
171 { 206 {
172 int oval = 1; 207 int oval = 1;
173 setsockopt (tcpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval); 208 setsockopt (tcpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);
174 } 209 }
175 210
211 sockinfo si (THISNODE, PROT_TCPv4);
212
213 if (bind (tcpv4_fd, si.sav4 (), si.salenv4 ()))
214 {
215 slog (L_ERR, _("can't bind tcpv4 on %s: %s"), (const char *)si, strerror (errno));
216 exit (1);
217 }
218
219 if (listen (tcpv4_fd, 5))
220 {
221 slog (L_ERR, _("can't listen tcpv4 on %s: %s"), (const char *)si, strerror (errno));
222 exit (1);
223 }
224
176 tcpv4_accept_watcher.start (tcpv4_fd, POLLIN); 225 tcpv4_ev_watcher.start (tcpv4_fd, POLLIN);
177 } 226 }
178#endif 227#endif
179 228
180 tap = new tap_device (); 229 tap = new tap_device ();
181 if (!tap) //D this, of course, never catches 230 if (!tap) //D this, of course, never catches
… …
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 (int fd, 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 (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 (int fd, 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 (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}
332
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
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 499#endif
407}
408 500
409void 501void
410vpn::tcpv4_accept (int fd, short revents) 502vpn::udpv4_ev (io_watcher &w, short revents)
411{ 503{
412 if (revents & (POLLIN | POLLERR)) 504 if (revents & (POLLIN | POLLERR))
413 { 505 {
506 vpn_packet *pkt = new vpn_packet;
414 struct sockaddr_in sa; 507 struct sockaddr_in sa;
415 socklen_t sa_len = sizeof (sa); 508 socklen_t sa_len = sizeof (sa);
416 int len; 509 int len;
417 510
418 fd = accept (fd, (sockaddr *)&sa, &sa_len); 511 len = recvfrom (w.fd, &((*pkt)[0]), MAXSIZE, 0, (sockaddr *)&sa, &sa_len);
419 512
420 if (fd >= 0)
421 {
422 fcntl (fd, F_SETFL, O_NONBLOCK);
423
424 sockinfo si(sa, PROT_TCPv4); 513 sockinfo si(sa, PROT_UDPv4);
425 tcp_info *i = new tcp_info (this);
426 514
427 i->fd = fd; 515 if (len > 0)
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 } 516 {
434 } 517 pkt->len = len;
435}
436 518
437void 519 recv_vpn_packet (pkt, si);
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 { 520 }
446 tcp_info *i = info->second; 521 else
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 } 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)
465 } 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 }
466} 542}
467 543
468#endif
469
470void 544void
471vpn::tap_ev (int fd, short revents) 545vpn::tap_ev (io_watcher &w, short revents)
472{ 546{
473 if (revents & POLLIN) 547 if (revents & POLLIN)
474 { 548 {
475 /* process data */ 549 /* process data */
476 tap_packet *pkt; 550 tap_packet *pkt;
477 551
478 pkt = tap->recv (); 552 pkt = tap->recv ();
479 553
554 if (!pkt)
555 return;
556
557 if (pkt->len > 14)
558 {
480 int dst = mac2id (pkt->dst); 559 int dst = mac2id (pkt->dst);
481 int src = mac2id (pkt->src); 560 int src = mac2id (pkt->src);
482 561
483 if (src != THISNODE->id) 562 if (src != THISNODE->id)
484 {
485 slog (L_ERR, _("FATAL: tap packet not originating on current node received, terminating."));
486 exit (1);
487 }
488
489 if (dst == THISNODE->id)
490 {
491 slog (L_ERR, _("FATAL: tap packet destined for current node received, terminating."));
492 exit (1);
493 }
494
495 if (dst > conns.size ())
496 slog (L_ERR, _("tap packet for unknown node %d received, ignoring."), dst);
497 else
498 {
499 if (dst)
500 { 563 {
501 // unicast 564 slog (L_ERR, _("FATAL: tap packet not originating on current node received, exiting."));
502 if (dst != THISNODE->id) 565 exit (1);
503 conns[dst - 1]->inject_data_packet (pkt);
504 } 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);
505 else 576 else
506 {
507 // broadcast, first check router, then self, then english
508 connection *router = find_router ();
509
510 if (router)
511 router->inject_data_packet (pkt, true); 577 inject_data_packet (pkt, dst);
512 else
513 for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)
514 if ((*c)->conf != THISNODE)
515 (*c)->inject_data_packet (pkt);
516 }
517 } 578 }
518 579
519 delete pkt; 580 delete pkt;
520 } 581 }
521 else if (revents & (POLLHUP | POLLERR)) 582 else if (revents & (POLLHUP | POLLERR))
… …
526 else 587 else
527 abort (); 588 abort ();
528} 589}
529 590
530void 591void
531vpn::event_cb (tstamp &ts) 592vpn::event_cb (time_watcher &w)
532{ 593{
533 if (events) 594 if (events)
534 { 595 {
535 if (events & EVENT_SHUTDOWN) 596 if (events & EVENT_SHUTDOWN)
536 { 597 {
… …
553 } 614 }
554 615
555 events = 0; 616 events = 0;
556 } 617 }
557 618
558 ts = TSTAMP_CANCEL; 619 w.at = TSTAMP_CANCEL;
559} 620}
560 621
561void 622void
562vpn::shutdown_all () 623vpn::shutdown_all ()
563{ 624{
… …
587 } 648 }
588} 649}
589 650
590connection *vpn::find_router () 651connection *vpn::find_router ()
591{ 652{
592 u32 prio = 0; 653 u32 prio = 1;
593 connection *router = 0; 654 connection *router = 0;
594 655
595 for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i) 656 for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)
596 { 657 {
597 connection *c = *i; 658 connection *c = *i;
598 659
599 if (c->conf->routerprio > prio 660 if (c->conf->routerprio > prio
600 && c->connectmode == conf_node::C_ALWAYS 661 && c->connectmode == conf_node::C_ALWAYS // so we don't drop the connection if in use
601 && c->conf != THISNODE
602 && c->ictx && c->octx) 662 && c->ictx && c->octx
663 && c->conf != THISNODE) // redundant, since ictx==octx==0 always on thisnode
603 { 664 {
604 prio = c->conf->routerprio; 665 prio = c->conf->routerprio;
605 router = c; 666 router = c;
606 } 667 }
607 } 668 }
608 669
609 return router; 670 return router;
610} 671}
611 672
612void vpn::connect_request (int id) 673void vpn::send_connect_request (int id)
613{ 674{
614 connection *c = find_router (); 675 connection *c = find_router ();
615 676
616 if (c) 677 if (c)
617 c->connect_request (id); 678 c->send_connect_request (id);
618 //else // does not work, because all others must connect to the same router 679 else
619 // // no router found, aggressively connect to all routers 680 // no router found, aggressively connect to all routers
620 // for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i) 681 for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)
621 // if ((*i)->conf->routerprio) 682 if ((*i)->conf->routerprio && (*i)->conf != THISNODE)
622 // (*i)->establish_connection (); 683 (*i)->establish_connection ();
623} 684}
624 685
625void 686void
626connection::dump_status () 687connection::dump_status ()
627{ 688{
… …
644 705
645 slog (L_NOTICE, _("END status dump")); 706 slog (L_NOTICE, _("END status dump"));
646} 707}
647 708
648vpn::vpn (void) 709vpn::vpn (void)
649: event(this, &vpn::event_cb) 710: event (this, &vpn::event_cb)
650, udpv4_ev_watcher(this, &vpn::udpv4_ev) 711, udpv4_ev_watcher (this, &vpn::udpv4_ev)
651, ipv4_ev_watcher (this, &vpn::ipv4_ev) 712, ipv4_ev_watcher (this, &vpn::ipv4_ev)
652, tap_ev_watcher (this, &vpn::tap_ev)
653#if ENABLE_TCP 713#if ENABLE_TCP
654, tcpv4_accept_watcher(this, &vpn::tcpv4_accept) 714, tcpv4_ev_watcher (this, &vpn::tcpv4_ev)
655#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)
656{ 720{
657} 721}
658 722
659vpn::~vpn () 723vpn::~vpn ()
660{ 724{

Diff Legend

– Removed lines
+ Added lines
< Changed lines
> Changed lines