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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 1.20 by pcg, Thu Oct 16 14:12:00 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 44
43#if ENABLE_TCP 45vpn network; // THE vpn (bad design...)
44# include <map>
45# include <unistd.h>
46# include <fcntl.h>
47# include <sys/poll.h>
48#endif
49 46
50///////////////////////////////////////////////////////////////////////////// 47/////////////////////////////////////////////////////////////////////////////
51 48
52const char *vpn::script_if_up () 49const char *vpn::script_if_up ()
53{ 50{
… …
78} 75}
79 76
80int 77int
81vpn::setup () 78vpn::setup ()
82{ 79{
80 ipv4_fd = -1;
81
82 if (THISNODE->protocols & PROT_IPv4 && ::conf.ip_proto)
83 {
84 ipv4_fd = socket (PF_INET, SOCK_RAW, ::conf.ip_proto);
85
86 if (ipv4_fd < 0)
87 return -1;
88
89 fcntl (ipv4_fd, F_SETFL, O_NONBLOCK);
90
91#if defined(SOL_IP) && defined(IP_MTU_DISCOVER)
92 // this I really consider a linux bug. I am neither connected
93 // nor do I fragment myself. Linux still sets DF and doesn't
94 // fragment for me sometimes.
95 {
96 int oval = IP_PMTUDISC_DONT;
97 setsockopt (ipv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);
98 }
99#endif
100
101 sockinfo si (THISNODE, PROT_IPv4);
102
103 if (bind (ipv4_fd, si.sav4 (), si.salenv4 ()))
104 {
105 slog (L_ERR, _("can't bind ipv4 socket on %s: %s"), (const char *)si, strerror (errno));
106 exit (1);
107 }
108
109 ipv4_ev_watcher.start (ipv4_fd, POLLIN);
110 }
111
83 udpv4_fd = -1; 112 udpv4_fd = -1;
84 113
85 if (THISNODE->protocols & PROT_UDPv4) 114 if (THISNODE->protocols & PROT_UDPv4 && THISNODE->udp_port)
86 { 115 {
87 udpv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP); 116 udpv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP);
88 117
89 if (udpv4_fd < 0) 118 if (udpv4_fd < 0)
90 return -1; 119 return -1;
91 120
92 sockinfo si (THISNODE, PROT_UDPv4); 121 fcntl (udpv4_fd, F_SETFL, O_NONBLOCK);
93 122
94 if (bind (udpv4_fd, si.sav4 (), si.salenv4 ())) 123 // standard daemon practise...
95 { 124 {
96 slog (L_ERR, _("can't bind udpv4 on %s: %s"), (const char *)si, strerror (errno)); 125 int oval = 1;
97 exit (1); 126 setsockopt (udpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);
98 } 127 }
99 128
100#ifdef IP_MTU_DISCOVER 129#if defined(SOL_IP) && defined(IP_MTU_DISCOVER)
101 // this I really consider a linux bug. I am neither connected 130 // this I really consider a linux bug. I am neither connected
102 // nor do I fragment myself. Linux still sets DF and doesn't 131 // nor do I fragment myself. Linux still sets DF and doesn't
103 // fragment for me sometimes. 132 // fragment for me sometimes.
104 { 133 {
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... 139 sockinfo si (THISNODE, PROT_UDPv4);
140
141 if (bind (udpv4_fd, si.sav4 (), si.salenv4 ()))
142 {
143 slog (L_ERR, _("can't bind udpv4 on %s: %s"), (const char *)si, strerror (errno));
144 exit (1);
145 }
146
147 udpv4_ev_watcher.start (udpv4_fd, POLLIN);
148 }
149
150 icmpv4_fd = -1;
151
152#if ENABLE_ICMP
153 if (THISNODE->protocols & PROT_ICMPv4)
154 {
155 icmpv4_fd = socket (PF_INET, SOCK_RAW, IPPROTO_ICMP);
156
157 if (icmpv4_fd < 0)
158 return -1;
159
160 fcntl (icmpv4_fd, F_SETFL, O_NONBLOCK);
161
162#ifdef ICMP_FILTER
111 { 163 {
112 int oval = 1; 164 icmp_filter oval;
165 oval.data = 0xffffffff;
166 if (::conf.icmp_type < 32)
167 oval.data &= ~(1 << ::conf.icmp_type);
168
113 setsockopt (udpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval); 169 setsockopt (icmpv4_fd, SOL_RAW, ICMP_FILTER, &oval, sizeof oval);
114 } 170 }
171#endif
115 172
116 udpv4_ev_watcher.start (udpv4_fd, POLLIN); 173#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 174 // this I really consider a linux bug. I am neither connected
137 // nor do I fragment myself. Linux still sets DF and doesn't 175 // nor do I fragment myself. Linux still sets DF and doesn't
138 // fragment for me sometimes. 176 // fragment for me sometimes.
139 { 177 {
140 int oval = IP_PMTUDISC_DONT; 178 int oval = IP_PMTUDISC_DONT;
141 setsockopt (ipv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval); 179 setsockopt (udpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);
142 } 180 }
143#endif 181#endif
144 182
183 sockinfo si (THISNODE, PROT_ICMPv4);
184
185 if (bind (icmpv4_fd, si.sav4 (), si.salenv4 ()))
186 {
187 slog (L_ERR, _("can't bind icmpv4 on %s: %s"), (const char *)si, strerror (errno));
188 exit (1);
189 }
190
145 ipv4_ev_watcher.start (ipv4_fd, POLLIN); 191 icmpv4_ev_watcher.start (icmpv4_fd, POLLIN);
146 } 192 }
193#endif
194
195 tcpv4_fd = -1;
147 196
148#if ENABLE_TCP 197#if ENABLE_TCP
149 if (THISNODE->protocols & PROT_TCPv4) 198 if (THISNODE->protocols & PROT_TCPv4 && THISNODE->tcp_port)
150 { 199 {
151 tcpv4_fd = socket (PF_INET, SOCK_STREAM, IPPROTO_TCP); 200 tcpv4_fd = socket (PF_INET, SOCK_STREAM, IPPROTO_TCP);
152 201
153 if (tcpv4_fd < 0) 202 if (tcpv4_fd < 0)
154 return -1; 203 return -1;
155 204
156 sockinfo si (THISNODE, PROT_TCPv4); 205 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 }
169 206
170 // standard daemon practise... 207 // standard daemon practise...
171 { 208 {
172 int oval = 1; 209 int oval = 1;
173 setsockopt (tcpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval); 210 setsockopt (tcpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);
174 } 211 }
175 212
213 sockinfo si (THISNODE, PROT_TCPv4);
214
215 if (bind (tcpv4_fd, si.sav4 (), si.salenv4 ()))
216 {
217 slog (L_ERR, _("can't bind tcpv4 on %s: %s"), (const char *)si, strerror (errno));
218 exit (1);
219 }
220
221 if (listen (tcpv4_fd, 5))
222 {
223 slog (L_ERR, _("can't listen tcpv4 on %s: %s"), (const char *)si, strerror (errno));
224 exit (1);
225 }
226
176 tcpv4_accept_watcher.start (tcpv4_fd, POLLIN); 227 tcpv4_ev_watcher.start (tcpv4_fd, POLLIN);
177 } 228 }
178#endif 229#endif
179 230
180 tap = new tap_device (); 231 tap = new tap_device ();
181 if (!tap) //D this, of course, never catches 232 if (!tap) //D this, of course, never catches
… …
191 reconnect_all (); 242 reconnect_all ();
192 243
193 return 0; 244 return 0;
194} 245}
195 246
196void 247// send a vpn packet out to other hosts
248bool
249vpn::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos)
250{
251 switch (si.prot)
252 {
253 case PROT_IPv4:
254 return send_ipv4_packet (pkt, si, tos);
255
256 case PROT_UDPv4:
257 return send_udpv4_packet (pkt, si, tos);
258
259#if ENABLE_TCP
260 case PROT_TCPv4:
261 return send_tcpv4_packet (pkt, si, tos);
262#endif
263
264#if ENABLE_ICMP
265 case PROT_ICMPv4:
266 return send_icmpv4_packet (pkt, si, tos);
267#endif
268
269 default:
270 slog (L_CRIT, _("%s: FATAL: trying to send packet with unsupported protocol"), (const char *)si);
271 return false;
272 }
273}
274
275bool
197vpn::send_ipv4_packet (vpn_packet *pkt, const sockinfo &si, int tos) 276vpn::send_ipv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)
198{ 277{
278#if defined(SOL_IP) && defined(IP_TOS)
199 setsockopt (ipv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos); 279 setsockopt (ipv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);
280#endif
200 sendto (ipv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ()); 281 sendto (ipv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());
201}
202 282
203void 283 return true;
284}
285
286static u16
287ipv4_checksum (u16 *data, unsigned int len)
288{
289 // use 32 bit accumulator and fold back carry bits at the end
290 u32 sum = 0;
291
292 while (len > 1)
293 {
294 sum += *data++;
295 len -= 2;
296 }
297
298 // odd byte left?
299 if (len)
300 sum += *(u8 *)data;
301
302 // add back carry bits
303 sum = (sum >> 16) + (sum & 0xffff); // lo += hi
304 sum += (sum >> 16); // carry
305
306 return ~sum;
307}
308
309#if ENABLE_ICMP
310bool
311vpn::send_icmpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)
312{
313#if defined(SOL_IP) && defined(IP_TOS)
314 setsockopt (icmpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);
315#endif
316
317 pkt->unshift_hdr (4);
318
319 icmp_header *hdr = (icmp_header *)&((*pkt)[0]);
320 hdr->type = ::conf.icmp_type;
321 hdr->code = 255;
322 hdr->checksum = 0;
323 hdr->checksum = ipv4_checksum ((u16 *)hdr, pkt->len);
324
325 sendto (icmpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());
326
327 return true;
328}
329#endif
330
331bool
204vpn::send_udpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos) 332vpn::send_udpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)
205{ 333{
334#if defined(SOL_IP) && defined(IP_TOS)
206 setsockopt (udpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos); 335 setsockopt (udpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);
336#endif
207 sendto (udpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ()); 337 sendto (udpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());
338
339 return true;
340}
341
342void
343vpn::inject_data_packet (tap_packet *pkt, int dst)
344{
345 if (dst)
346 {
347 // unicast
348 if (dst != THISNODE->id)
349 conns[dst - 1]->inject_data_packet (pkt);
350 }
351 else
352 {
353 // broadcast, this is ugly, but due to the security policy
354 // we have to connect to all hosts...
355 for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)
356 if ((*c)->conf != THISNODE)
357 (*c)->inject_data_packet (pkt, true);
358 }
208} 359}
209 360
210void 361void
211vpn::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi) 362vpn::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)
212{ 363{
… …
219 if (src == 0 || src > conns.size () 370 if (src == 0 || src > conns.size ()
220 || dst > conns.size () 371 || dst > conns.size ()
221 || pkt->typ () >= vpn_packet::PT_MAX) 372 || pkt->typ () >= vpn_packet::PT_MAX)
222 slog (L_WARN, _("(%s): received corrupted packet type %d (src %d, dst %d)"), 373 slog (L_WARN, _("(%s): received corrupted packet type %d (src %d, dst %d)"),
223 (const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ()); 374 (const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ());
375 else if (dst > conns.size ())
376 slog (L_WARN, _("(%s): received corrupted packet type %d (src %d, dst %d)"),
377 (const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ());
224 else 378 else
225 { 379 {
226 connection *c = conns[src - 1]; 380 connection *c = conns[src - 1];
227 381
228 if (dst == 0 && !THISNODE->routerprio) 382 if (dst == 0)
229 slog (L_WARN, _("%s(%s): received broadcast, but we are no router"), 383 slog (L_WARN, _("%s(%s): received broadcast (protocol violation)"),
230 c->conf->nodename, (const char *)rsi); 384 c->conf->nodename, (const char *)rsi);
231 else if (dst != 0 && dst != THISNODE->id) 385 else if (dst != THISNODE->id)
232 // FORWARDING NEEDED ;) 386 {
387 if (THISNODE->routerprio)
388 // the tos setting gets lost here. who cares.
389 conns[dst - 1]->inject_vpn_packet (pkt);
390 else
233 slog (L_WARN, 391 slog (L_WARN,
234 _("received frame for node %d ('%s') from %s, but this is node %d ('%s')"), 392 _("%s(%s): forwarding request (=> %s), but we are no router"),
393 c->conf->nodename, (const char *)rsi,
235 dst, conns[dst - 1]->conf->nodename, 394 conns[dst - 1]->conf->nodename);
236 (const char *)rsi, 395 }
237 THISNODE->id, THISNODE->nodename);
238 else 396 else
239 c->recv_vpn_packet (pkt, rsi); 397 c->recv_vpn_packet (pkt, rsi);
240 } 398 }
241} 399}
242 400
243void 401void
244vpn::udpv4_ev (int fd, short revents) 402vpn::ipv4_ev (io_watcher &w, short revents)
245{ 403{
246 if (revents & (POLLIN | POLLERR)) 404 if (revents & (POLLIN | POLLERR))
247 { 405 {
248 vpn_packet *pkt = new vpn_packet; 406 vpn_packet *pkt = new vpn_packet;
249 struct sockaddr_in sa; 407 struct sockaddr_in sa;
250 socklen_t sa_len = sizeof (sa); 408 socklen_t sa_len = sizeof (sa);
251 int len; 409 int len;
252 410
253 len = recvfrom (fd, &((*pkt)[0]), MAXSIZE, 0, (sockaddr *)&sa, &sa_len); 411 len = recvfrom (w.fd, &((*pkt)[0]), MAXSIZE, 0, (sockaddr *)&sa, &sa_len);
254 412
255 sockinfo si(sa); 413 sockinfo si(sa, PROT_IPv4);
256 414
257 if (len > 0) 415 if (len > 0)
258 { 416 {
259 pkt->len = len; 417 pkt->len = len;
418
419 // raw sockets deliver the ipv4, but don't expect it on sends
420 // this is slow, but...
421 pkt->skip_hdr (IP_OVERHEAD);
260 422
261 recv_vpn_packet (pkt, si); 423 recv_vpn_packet (pkt, si);
262 } 424 }
263 else 425 else
264 { 426 {
… …
269 delete pkt; 431 delete pkt;
270 } 432 }
271 else if (revents & POLLHUP) 433 else if (revents & POLLHUP)
272 { 434 {
273 // this cannot ;) happen on udp sockets 435 // this cannot ;) happen on udp sockets
274 slog (L_ERR, _("FATAL: POLLHUP on udp v4 fd, terminating.")); 436 slog (L_ERR, _("FATAL: POLLHUP on ipv4 fd, terminating."));
275 exit (1); 437 exit (1);
276 } 438 }
277 else 439 else
278 { 440 {
279 slog (L_ERR, 441 slog (L_ERR,
… …
281 revents); 443 revents);
282 exit (1); 444 exit (1);
283 } 445 }
284} 446}
285 447
448#if ENABLE_ICMP
286void 449void
287vpn::ipv4_ev (int fd, short revents) 450vpn::icmpv4_ev (io_watcher &w, short revents)
288{ 451{
289 if (revents & (POLLIN | POLLERR)) 452 if (revents & (POLLIN | POLLERR))
290 { 453 {
291 vpn_packet *pkt = new vpn_packet; 454 vpn_packet *pkt = new vpn_packet;
292 struct sockaddr_in sa; 455 struct sockaddr_in sa;
293 socklen_t sa_len = sizeof (sa); 456 socklen_t sa_len = sizeof (sa);
294 int len; 457 int len;
295 458
296 len = recvfrom (fd, &((*pkt)[0]), MAXSIZE, 0, (sockaddr *)&sa, &sa_len); 459 len = recvfrom (w.fd, &((*pkt)[0]), MAXSIZE, 0, (sockaddr *)&sa, &sa_len);
297 460
298 sockinfo si(sa, PROT_IPv4); 461 sockinfo si(sa, PROT_ICMPv4);
299 462
300 if (len > 0) 463 if (len > 0)
301 { 464 {
302 pkt->len = len; 465 pkt->len = len;
303 466
467 icmp_header *hdr = (icmp_header *)&((*pkt)[IP_OVERHEAD]);
468
469 if (hdr->type == ::conf.icmp_type
470 && hdr->code == 255)
471 {
304 // raw sockets deliver the ipv4, but don't expect it on sends 472 // raw sockets deliver the ipv4, but don't expect it on sends
305 // this is slow, but... 473 // this is slow, but...
306 pkt->skip_hdr (IP_OVERHEAD); 474 pkt->skip_hdr (ICMP_OVERHEAD);
307 475
308 recv_vpn_packet (pkt, si); 476 recv_vpn_packet (pkt, si);
477 }
309 } 478 }
310 else 479 else
311 { 480 {
312 // probably ECONNRESET or somesuch 481 // probably ECONNRESET or somesuch
313 slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno)); 482 slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno));
… …
316 delete pkt; 485 delete pkt;
317 } 486 }
318 else if (revents & POLLHUP) 487 else if (revents & POLLHUP)
319 { 488 {
320 // this cannot ;) happen on udp sockets 489 // this cannot ;) happen on udp sockets
321 slog (L_ERR, _("FATAL: POLLHUP on ipv4 fd, terminating.")); 490 slog (L_ERR, _("FATAL: POLLHUP on icmpv4 fd, terminating."));
322 exit (1); 491 exit (1);
323 } 492 }
324 else 493 else
325 { 494 {
326 slog (L_ERR, 495 slog (L_ERR,
327 _("FATAL: unknown revents %08x in socket, terminating\n"), 496 _("FATAL: unknown revents %08x in socket, terminating\n"),
328 revents); 497 revents);
329 exit (1); 498 exit (1);
330 } 499 }
331} 500}
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 501#endif
407}
408 502
409void 503void
410vpn::tcpv4_accept (int fd, short revents) 504vpn::udpv4_ev (io_watcher &w, short revents)
411{ 505{
412 if (revents & (POLLIN | POLLERR)) 506 if (revents & (POLLIN | POLLERR))
413 { 507 {
508 vpn_packet *pkt = new vpn_packet;
414 struct sockaddr_in sa; 509 struct sockaddr_in sa;
415 socklen_t sa_len = sizeof (sa); 510 socklen_t sa_len = sizeof (sa);
416 int len; 511 int len;
417 512
418 fd = accept (fd, (sockaddr *)&sa, &sa_len); 513 len = recvfrom (w.fd, &((*pkt)[0]), MAXSIZE, 0, (sockaddr *)&sa, &sa_len);
419 514
420 if (fd >= 0)
421 {
422 fcntl (fd, F_SETFL, O_NONBLOCK);
423
424 sockinfo si(sa, PROT_TCPv4); 515 sockinfo si(sa, PROT_UDPv4);
425 tcp_info *i = new tcp_info (this);
426 516
427 i->fd = fd; 517 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 } 518 {
434 } 519 pkt->len = len;
435}
436 520
437void 521 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 { 522 }
446 tcp_info *i = info->second; 523 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 } 524 {
525 // probably ECONNRESET or somesuch
526 slog (L_DEBUG, _("%s: fd %d, %s"), (const char *)si, w.fd, strerror (errno));
527 }
528
529 delete pkt;
530 }
531 else if (revents & POLLHUP)
465 } 532 {
533 // this cannot ;) happen on udp sockets
534 slog (L_ERR, _("FATAL: POLLHUP on udp v4 fd, terminating."));
535 exit (1);
536 }
537 else
538 {
539 slog (L_ERR,
540 _("FATAL: unknown revents %08x in socket, terminating\n"),
541 revents);
542 exit (1);
543 }
466} 544}
467 545
468#endif
469
470void 546void
471vpn::tap_ev (int fd, short revents) 547vpn::tap_ev (io_watcher &w, short revents)
472{ 548{
473 if (revents & POLLIN) 549 if (revents & POLLIN)
474 { 550 {
475 /* process data */ 551 /* process data */
476 tap_packet *pkt; 552 tap_packet *pkt;
477 553
478 pkt = tap->recv (); 554 pkt = tap->recv ();
479 555
556 if (!pkt)
557 return;
558
559 if (pkt->len > 14)
560 {
480 int dst = mac2id (pkt->dst); 561 int dst = mac2id (pkt->dst);
481 int src = mac2id (pkt->src); 562 int src = mac2id (pkt->src);
482 563
483 if (src != THISNODE->id) 564 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 { 565 {
501 // unicast 566 slog (L_ERR, _("FATAL: tap packet not originating on current node received, exiting."));
502 if (dst != THISNODE->id) 567 exit (1);
503 conns[dst - 1]->inject_data_packet (pkt);
504 } 568 }
569
570 if (dst == THISNODE->id)
571 {
572 slog (L_ERR, _("FATAL: tap packet destined for current node received, exiting."));
573 exit (1);
574 }
575
576 if (dst > conns.size ())
577 slog (L_ERR, _("tap packet for unknown node %d received, ignoring."), dst);
505 else 578 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); 579 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 } 580 }
518 581
519 delete pkt; 582 delete pkt;
520 } 583 }
521 else if (revents & (POLLHUP | POLLERR)) 584 else if (revents & (POLLHUP | POLLERR))
… …
526 else 589 else
527 abort (); 590 abort ();
528} 591}
529 592
530void 593void
531vpn::event_cb (tstamp &ts) 594vpn::event_cb (time_watcher &w)
532{ 595{
533 if (events) 596 if (events)
534 { 597 {
535 if (events & EVENT_SHUTDOWN) 598 if (events & EVENT_SHUTDOWN)
536 { 599 {
… …
553 } 616 }
554 617
555 events = 0; 618 events = 0;
556 } 619 }
557 620
558 ts = TSTAMP_CANCEL; 621 w.at = TSTAMP_CANCEL;
559} 622}
560 623
561void 624void
562vpn::shutdown_all () 625vpn::shutdown_all ()
563{ 626{
… …
587 } 650 }
588} 651}
589 652
590connection *vpn::find_router () 653connection *vpn::find_router ()
591{ 654{
592 u32 prio = 0; 655 u32 prio = 1;
593 connection *router = 0; 656 connection *router = 0;
594 657
595 for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i) 658 for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)
596 { 659 {
597 connection *c = *i; 660 connection *c = *i;
598 661
599 if (c->conf->routerprio > prio 662 if (c->conf->routerprio > prio
600 && c->connectmode == conf_node::C_ALWAYS 663 && 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) 664 && c->ictx && c->octx
665 && c->conf != THISNODE) // redundant, since ictx==octx==0 always on thisnode
603 { 666 {
604 prio = c->conf->routerprio; 667 prio = c->conf->routerprio;
605 router = c; 668 router = c;
606 } 669 }
607 } 670 }
608 671
609 return router; 672 return router;
610} 673}
611 674
612void vpn::connect_request (int id) 675void vpn::send_connect_request (int id)
613{ 676{
614 connection *c = find_router (); 677 connection *c = find_router ();
615 678
616 if (c) 679 if (c)
617 c->connect_request (id); 680 c->send_connect_request (id);
618 //else // does not work, because all others must connect to the same router 681 else
619 // // no router found, aggressively connect to all routers 682 // no router found, aggressively connect to all routers
620 // for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i) 683 for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)
621 // if ((*i)->conf->routerprio) 684 if ((*i)->conf->routerprio && (*i)->conf != THISNODE)
622 // (*i)->establish_connection (); 685 (*i)->establish_connection ();
623} 686}
624 687
625void 688void
626connection::dump_status () 689connection::dump_status ()
627{ 690{
… …
644 707
645 slog (L_NOTICE, _("END status dump")); 708 slog (L_NOTICE, _("END status dump"));
646} 709}
647 710
648vpn::vpn (void) 711vpn::vpn (void)
649: event(this, &vpn::event_cb) 712: event (this, &vpn::event_cb)
650, udpv4_ev_watcher(this, &vpn::udpv4_ev) 713, udpv4_ev_watcher (this, &vpn::udpv4_ev)
651, ipv4_ev_watcher (this, &vpn::ipv4_ev) 714, ipv4_ev_watcher (this, &vpn::ipv4_ev)
652, tap_ev_watcher (this, &vpn::tap_ev)
653#if ENABLE_TCP 715#if ENABLE_TCP
654, tcpv4_accept_watcher(this, &vpn::tcpv4_accept) 716, tcpv4_ev_watcher (this, &vpn::tcpv4_ev)
655#endif 717#endif
718#if ENABLE_ICMP
719, icmpv4_ev_watcher(this, &vpn::icmpv4_ev)
720#endif
721, tap_ev_watcher (this, &vpn::tap_ev)
656{ 722{
657} 723}
658 724
659vpn::~vpn () 725vpn::~vpn ()
660{ 726{

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