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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 1.14 by pcg, Tue Oct 14 03:22:09 2003 UTC

… …
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> 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#include <netinet/in.h>
37#include <arpa/inet.h>
38#include <net/if.h>
39#ifdef HAVE_NETINET_IN_SYSTM_H
40# include <netinet/in_systm.h>
41#endif
42#ifdef HAVE_NETINET_IP_H
43# include <netinet/ip.h>
44#endif
45#ifdef HAVE_NETINET_TCP_H
46# include <netinet/tcp.h>
47#endif
48#if ENABLE_ICMP
49# include <netinet/ip_icmp.h>
50#endif
36 51
37#include "pidfile.h" 52#include "pidfile.h"
38 53
39#include "connection.h" 54#include "connection.h"
40#include "util.h" 55#include "util.h"
41#include "vpn.h" 56#include "vpn.h"
42 57
43#if ENABLE_TCP 58#if !defined(SOL_IP) && defined(IPPROTO_IP)
44# include <map> 59# define SOL_IP IPPROTO_IP
45# include <unistd.h>
46# include <fcntl.h>
47# include <sys/poll.h>
48#endif 60#endif
49 61
50///////////////////////////////////////////////////////////////////////////// 62/////////////////////////////////////////////////////////////////////////////
51 63
52const char *vpn::script_if_up () 64const char *vpn::script_if_up ()
… …
78} 90}
79 91
80int 92int
81vpn::setup () 93vpn::setup ()
82{ 94{
95 ipv4_fd = -1;
96
97 if (THISNODE->protocols & PROT_IPv4 && ::conf.ip_proto)
98 {
99 ipv4_fd = socket (PF_INET, SOCK_RAW, ::conf.ip_proto);
100
101 if (ipv4_fd < 0)
102 return -1;
103
104 fcntl (ipv4_fd, F_SETFL, O_NONBLOCK);
105
106#if defined(SOL_IP) && defined(IP_MTU_DISCOVER)
107 // this I really consider a linux bug. I am neither connected
108 // nor do I fragment myself. Linux still sets DF and doesn't
109 // fragment for me sometimes.
110 {
111 int oval = IP_PMTUDISC_DONT;
112 setsockopt (ipv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);
113 }
114#endif
115
116 sockinfo si (THISNODE, PROT_IPv4);
117
118 if (bind (ipv4_fd, si.sav4 (), si.salenv4 ()))
119 {
120 slog (L_ERR, _("can't bind ipv4 socket on %s: %s"), (const char *)si, strerror (errno));
121 exit (1);
122 }
123
124 ipv4_ev_watcher.start (ipv4_fd, POLLIN);
125 }
126
83 udpv4_fd = -1; 127 udpv4_fd = -1;
84 128
85 if (THISNODE->protocols & PROT_UDPv4) 129 if (THISNODE->protocols & PROT_UDPv4 && THISNODE->udp_port)
86 { 130 {
87 udpv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP); 131 udpv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP);
88 132
89 if (udpv4_fd < 0) 133 if (udpv4_fd < 0)
90 return -1; 134 return -1;
91 135
92 sockinfo si (THISNODE, PROT_UDPv4); 136 fcntl (udpv4_fd, F_SETFL, O_NONBLOCK);
93 137
94 if (bind (udpv4_fd, si.sav4 (), si.salenv4 ())) 138 // standard daemon practise...
95 { 139 {
96 slog (L_ERR, _("can't bind udpv4 on %s: %s"), (const char *)si, strerror (errno)); 140 int oval = 1;
97 exit (1); 141 setsockopt (udpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);
98 } 142 }
99 143
100#ifdef IP_MTU_DISCOVER 144#if defined(SOL_IP) && defined(IP_MTU_DISCOVER)
101 // this I really consider a linux bug. I am neither connected 145 // this I really consider a linux bug. I am neither connected
102 // nor do I fragment myself. Linux still sets DF and doesn't 146 // nor do I fragment myself. Linux still sets DF and doesn't
103 // fragment for me sometimes. 147 // fragment for me sometimes.
104 { 148 {
105 int oval = IP_PMTUDISC_DONT; 149 int oval = IP_PMTUDISC_DONT;
106 setsockopt (udpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval); 150 setsockopt (udpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);
107 } 151 }
108#endif 152#endif
109 153
110 // standard daemon practise... 154 sockinfo si (THISNODE, PROT_UDPv4);
155
156 if (bind (udpv4_fd, si.sav4 (), si.salenv4 ()))
157 {
158 slog (L_ERR, _("can't bind udpv4 on %s: %s"), (const char *)si, strerror (errno));
159 exit (1);
160 }
161
162 udpv4_ev_watcher.start (udpv4_fd, POLLIN);
163 }
164
165 icmpv4_fd = -1;
166
167#if ENABLE_ICMP
168 if (THISNODE->protocols & PROT_ICMPv4)
169 {
170 icmpv4_fd = socket (PF_INET, SOCK_RAW, IPPROTO_ICMP);
171
172 if (icmpv4_fd < 0)
173 return -1;
174
175 fcntl (icmpv4_fd, F_SETFL, O_NONBLOCK);
176
177#ifdef ICMP_FILTER
111 { 178 {
112 int oval = 1; 179 icmp_filter oval;
180 oval.data = 0xffffffff;
181 if (::conf.icmp_type < 32)
182 oval.data &= ~(1 << ::conf.icmp_type);
183
113 setsockopt (udpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval); 184 setsockopt (icmpv4_fd, SOL_RAW, ICMP_FILTER, &oval, sizeof oval);
114 } 185 }
186#endif
115 187
116 udpv4_ev_watcher.start (udpv4_fd, POLLIN); 188#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 189 // this I really consider a linux bug. I am neither connected
137 // nor do I fragment myself. Linux still sets DF and doesn't 190 // nor do I fragment myself. Linux still sets DF and doesn't
138 // fragment for me sometimes. 191 // fragment for me sometimes.
139 { 192 {
140 int oval = IP_PMTUDISC_DONT; 193 int oval = IP_PMTUDISC_DONT;
141 setsockopt (ipv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval); 194 setsockopt (udpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);
142 } 195 }
143#endif 196#endif
144 197
198 sockinfo si (THISNODE, PROT_ICMPv4);
199
200 if (bind (icmpv4_fd, si.sav4 (), si.salenv4 ()))
201 {
202 slog (L_ERR, _("can't bind icmpv4 on %s: %s"), (const char *)si, strerror (errno));
203 exit (1);
204 }
205
145 ipv4_ev_watcher.start (ipv4_fd, POLLIN); 206 icmpv4_ev_watcher.start (icmpv4_fd, POLLIN);
146 } 207 }
208#endif
209
210 tcpv4_fd = -1;
147 211
148#if ENABLE_TCP 212#if ENABLE_TCP
149 if (THISNODE->protocols & PROT_TCPv4) 213 if (THISNODE->protocols & PROT_TCPv4 && THISNODE->tcp_port)
150 { 214 {
151 tcpv4_fd = socket (PF_INET, SOCK_STREAM, IPPROTO_TCP); 215 tcpv4_fd = socket (PF_INET, SOCK_STREAM, IPPROTO_TCP);
152 216
153 if (tcpv4_fd < 0) 217 if (tcpv4_fd < 0)
154 return -1; 218 return -1;
155 219
156 sockinfo si (THISNODE, PROT_TCPv4); 220 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 }
169 221
170 // standard daemon practise... 222 // standard daemon practise...
171 { 223 {
172 int oval = 1; 224 int oval = 1;
173 setsockopt (tcpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval); 225 setsockopt (tcpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);
174 } 226 }
175 227
228 sockinfo si (THISNODE, PROT_TCPv4);
229
230 if (bind (tcpv4_fd, si.sav4 (), si.salenv4 ()))
231 {
232 slog (L_ERR, _("can't bind tcpv4 on %s: %s"), (const char *)si, strerror (errno));
233 exit (1);
234 }
235
236 if (listen (tcpv4_fd, 5))
237 {
238 slog (L_ERR, _("can't listen tcpv4 on %s: %s"), (const char *)si, strerror (errno));
239 exit (1);
240 }
241
176 tcpv4_accept_watcher.start (tcpv4_fd, POLLIN); 242 tcpv4_ev_watcher.start (tcpv4_fd, POLLIN);
177 } 243 }
178#endif 244#endif
179 245
180 tap = new tap_device (); 246 tap = new tap_device ();
181 if (!tap) //D this, of course, never catches 247 if (!tap) //D this, of course, never catches
… …
191 reconnect_all (); 257 reconnect_all ();
192 258
193 return 0; 259 return 0;
194} 260}
195 261
196void 262// send a vpn packet out to other hosts
263bool
264vpn::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos)
265{
266 switch (si.prot)
267 {
268 case PROT_IPv4:
269 return send_ipv4_packet (pkt, si, tos);
270
271 case PROT_UDPv4:
272 return send_udpv4_packet (pkt, si, tos);
273
274#if ENABLE_TCP
275 case PROT_TCPv4:
276 return send_tcpv4_packet (pkt, si, tos);
277#endif
278
279#if ENABLE_ICMP
280 case PROT_ICMPv4:
281 return send_icmpv4_packet (pkt, si, tos);
282#endif
283
284 default:
285 slog (L_CRIT, _("%s: FATAL: trying to send packet with unsupported protocol"), (const char *)si);
286 return false;
287 }
288}
289
290bool
197vpn::send_ipv4_packet (vpn_packet *pkt, const sockinfo &si, int tos) 291vpn::send_ipv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)
198{ 292{
293#if defined(SOL_IP) && defined(IP_TOS)
199 setsockopt (ipv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos); 294 setsockopt (ipv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);
295#endif
200 sendto (ipv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ()); 296 sendto (ipv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());
201}
202 297
203void 298 return true;
299}
300
301static u16
302ipv4_checksum (u16 *data, unsigned int len)
303{
304 // use 32 bit accumulator and fold back carry bits at the end
305 u32 sum = 0;
306
307 while (len > 1)
308 {
309 sum += *data++;
310 len -= 2;
311 }
312
313 // odd byte left?
314 if (len)
315 sum += *(u8 *)data;
316
317 // add back carry bits
318 sum = (sum >> 16) + (sum & 0xffff); // lo += hi
319 sum += (sum >> 16); // carry
320
321 return ~sum;
322}
323
324#if ENABLE_ICMP
325struct icmp_header {
326 u8 type;
327 u8 code;
328 u16 checksum;
329 union {
330 struct {
331 u16 id;
332 u16 sequence;
333 } echo;
334 u32 gateway;
335 struct {
336 u16 unused;
337 u16 mtu;
338 } frag;
339 } un;
340};
341
342bool
343vpn::send_icmpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)
344{
345#if defined(SOL_IP) && defined(IP_TOS)
346 setsockopt (icmpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);
347#endif
348
349 pkt->unshift_hdr (4);
350
351 icmp_header *hdr = (icmp_header *)&((*pkt)[0]);
352 hdr->type = ::conf.icmp_type;
353 hdr->code = 255;
354 hdr->checksum = 0;
355 hdr->checksum = ipv4_checksum ((u16 *)hdr, pkt->len);
356
357 sendto (icmpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());
358
359 return true;
360}
361#endif
362
363bool
204vpn::send_udpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos) 364vpn::send_udpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)
205{ 365{
366#if defined(SOL_IP) && defined(IP_TOS)
206 setsockopt (udpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos); 367 setsockopt (udpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);
368#endif
207 sendto (udpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ()); 369 sendto (udpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());
370
371 return true;
208} 372}
209 373
210void 374void
211vpn::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi) 375vpn::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)
212{ 376{
… …
219 if (src == 0 || src > conns.size () 383 if (src == 0 || src > conns.size ()
220 || dst > conns.size () 384 || dst > conns.size ()
221 || pkt->typ () >= vpn_packet::PT_MAX) 385 || pkt->typ () >= vpn_packet::PT_MAX)
222 slog (L_WARN, _("(%s): received corrupted packet type %d (src %d, dst %d)"), 386 slog (L_WARN, _("(%s): received corrupted packet type %d (src %d, dst %d)"),
223 (const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ()); 387 (const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ());
388 else if (dst > conns.size ())
389 slog (L_WARN, _("(%s): received corrupted packet type %d (src %d, dst %d)"),
390 (const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ());
224 else 391 else
225 { 392 {
226 connection *c = conns[src - 1]; 393 connection *c = conns[src - 1];
227 394
228 if (dst == 0 && !THISNODE->routerprio) 395 if (dst == 0)
229 slog (L_WARN, _("%s(%s): received broadcast, but we are no router"), 396 slog (L_WARN, _("%s(%s): received broadcast (protocol violation)"),
230 c->conf->nodename, (const char *)rsi); 397 c->conf->nodename, (const char *)rsi);
231 else if (dst != 0 && dst != THISNODE->id) 398 else if (dst != 0 && dst != THISNODE->id)
232 // FORWARDING NEEDED ;) 399 {
400 if (THISNODE->routerprio)
401 // the tos setting gets lost here. who cares.
402 conns[dst - 1]->inject_vpn_packet (pkt);
403 else
233 slog (L_WARN, 404 slog (L_WARN,
234 _("received frame for node %d ('%s') from %s, but this is node %d ('%s')"), 405 _("%s(%s): forwarding request (=> %s), but we are no router"),
406 c->conf->nodename, (const char *)rsi,
235 dst, conns[dst - 1]->conf->nodename, 407 conns[dst - 1]->conf->nodename);
236 (const char *)rsi, 408 }
237 THISNODE->id, THISNODE->nodename);
238 else 409 else
239 c->recv_vpn_packet (pkt, rsi); 410 c->recv_vpn_packet (pkt, rsi);
240 } 411 }
241} 412}
242 413
243void 414void
244vpn::udpv4_ev (int fd, short revents) 415vpn::ipv4_ev (io_watcher &w, short revents)
245{ 416{
246 if (revents & (POLLIN | POLLERR)) 417 if (revents & (POLLIN | POLLERR))
247 { 418 {
248 vpn_packet *pkt = new vpn_packet; 419 vpn_packet *pkt = new vpn_packet;
249 struct sockaddr_in sa; 420 struct sockaddr_in sa;
250 socklen_t sa_len = sizeof (sa); 421 socklen_t sa_len = sizeof (sa);
251 int len; 422 int len;
252 423
253 len = recvfrom (fd, &((*pkt)[0]), MAXSIZE, 0, (sockaddr *)&sa, &sa_len); 424 len = recvfrom (w.fd, &((*pkt)[0]), MAXSIZE, 0, (sockaddr *)&sa, &sa_len);
254 425
255 sockinfo si(sa); 426 sockinfo si(sa, PROT_IPv4);
256 427
257 if (len > 0) 428 if (len > 0)
258 { 429 {
259 pkt->len = len; 430 pkt->len = len;
431
432 // raw sockets deliver the ipv4, but don't expect it on sends
433 // this is slow, but...
434 pkt->skip_hdr (IP_OVERHEAD);
260 435
261 recv_vpn_packet (pkt, si); 436 recv_vpn_packet (pkt, si);
262 } 437 }
263 else 438 else
264 { 439 {
… …
269 delete pkt; 444 delete pkt;
270 } 445 }
271 else if (revents & POLLHUP) 446 else if (revents & POLLHUP)
272 { 447 {
273 // this cannot ;) happen on udp sockets 448 // this cannot ;) happen on udp sockets
274 slog (L_ERR, _("FATAL: POLLHUP on udp v4 fd, terminating.")); 449 slog (L_ERR, _("FATAL: POLLHUP on ipv4 fd, terminating."));
275 exit (1); 450 exit (1);
276 } 451 }
277 else 452 else
278 { 453 {
279 slog (L_ERR, 454 slog (L_ERR,
… …
281 revents); 456 revents);
282 exit (1); 457 exit (1);
283 } 458 }
284} 459}
285 460
461#if ENABLE_ICMP
286void 462void
287vpn::ipv4_ev (int fd, short revents) 463vpn::icmpv4_ev (io_watcher &w, short revents)
288{ 464{
289 if (revents & (POLLIN | POLLERR)) 465 if (revents & (POLLIN | POLLERR))
290 { 466 {
291 vpn_packet *pkt = new vpn_packet; 467 vpn_packet *pkt = new vpn_packet;
292 struct sockaddr_in sa; 468 struct sockaddr_in sa;
293 socklen_t sa_len = sizeof (sa); 469 socklen_t sa_len = sizeof (sa);
294 int len; 470 int len;
295 471
296 len = recvfrom (fd, &((*pkt)[0]), MAXSIZE, 0, (sockaddr *)&sa, &sa_len); 472 len = recvfrom (w.fd, &((*pkt)[0]), MAXSIZE, 0, (sockaddr *)&sa, &sa_len);
297 473
298 sockinfo si(sa, PROT_IPv4); 474 sockinfo si(sa, PROT_ICMPv4);
299 475
300 if (len > 0) 476 if (len > 0)
301 { 477 {
302 pkt->len = len; 478 pkt->len = len;
303 479
480 icmp_header *hdr = (icmp_header *)&((*pkt)[IP_OVERHEAD]);
481
482 if (hdr->type == ::conf.icmp_type
483 && hdr->code == 255)
484 {
304 // raw sockets deliver the ipv4, but don't expect it on sends 485 // raw sockets deliver the ipv4, but don't expect it on sends
305 // this is slow, but... 486 // this is slow, but...
306 pkt->skip_hdr (IP_OVERHEAD); 487 pkt->skip_hdr (ICMP_OVERHEAD);
307 488
308 recv_vpn_packet (pkt, si); 489 recv_vpn_packet (pkt, si);
490 }
309 } 491 }
310 else 492 else
311 { 493 {
312 // probably ECONNRESET or somesuch 494 // probably ECONNRESET or somesuch
313 slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno)); 495 slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno));
… …
316 delete pkt; 498 delete pkt;
317 } 499 }
318 else if (revents & POLLHUP) 500 else if (revents & POLLHUP)
319 { 501 {
320 // this cannot ;) happen on udp sockets 502 // this cannot ;) happen on udp sockets
321 slog (L_ERR, _("FATAL: POLLHUP on ipv4 fd, terminating.")); 503 slog (L_ERR, _("FATAL: POLLHUP on icmpv4 fd, terminating."));
322 exit (1); 504 exit (1);
323 } 505 }
324 else 506 else
325 { 507 {
326 slog (L_ERR, 508 slog (L_ERR,
327 _("FATAL: unknown revents %08x in socket, terminating\n"), 509 _("FATAL: unknown revents %08x in socket, terminating\n"),
328 revents); 510 revents);
329 exit (1); 511 exit (1);
330 } 512 }
331} 513}
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 514#endif
407}
408 515
409void 516void
410vpn::tcpv4_accept (int fd, short revents) 517vpn::udpv4_ev (io_watcher &w, short revents)
411{ 518{
412 if (revents & (POLLIN | POLLERR)) 519 if (revents & (POLLIN | POLLERR))
413 { 520 {
521 vpn_packet *pkt = new vpn_packet;
414 struct sockaddr_in sa; 522 struct sockaddr_in sa;
415 socklen_t sa_len = sizeof (sa); 523 socklen_t sa_len = sizeof (sa);
416 int len; 524 int len;
417 525
418 fd = accept (fd, (sockaddr *)&sa, &sa_len); 526 len = recvfrom (w.fd, &((*pkt)[0]), MAXSIZE, 0, (sockaddr *)&sa, &sa_len);
419 527
420 if (fd >= 0)
421 {
422 fcntl (fd, F_SETFL, O_NONBLOCK);
423
424 sockinfo si(sa, PROT_TCPv4); 528 sockinfo si(sa, PROT_UDPv4);
425 tcp_info *i = new tcp_info (this);
426 529
427 i->fd = fd; 530 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 } 531 {
434 } 532 pkt->len = len;
435}
436 533
437void 534 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 { 535 }
446 tcp_info *i = info->second; 536 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 } 537 {
538 // probably ECONNRESET or somesuch
539 slog (L_DEBUG, _("%s: fd %d, %s"), (const char *)si, w.fd, strerror (errno));
540 }
541
542 delete pkt;
543 }
544 else if (revents & POLLHUP)
465 } 545 {
546 // this cannot ;) happen on udp sockets
547 slog (L_ERR, _("FATAL: POLLHUP on udp v4 fd, terminating."));
548 exit (1);
549 }
550 else
551 {
552 slog (L_ERR,
553 _("FATAL: unknown revents %08x in socket, terminating\n"),
554 revents);
555 exit (1);
556 }
466} 557}
467 558
468#endif
469
470void 559void
471vpn::tap_ev (int fd, short revents) 560vpn::tap_ev (io_watcher &w, short revents)
472{ 561{
473 if (revents & POLLIN) 562 if (revents & POLLIN)
474 { 563 {
475 /* process data */ 564 /* process data */
476 tap_packet *pkt; 565 tap_packet *pkt;
… …
480 int dst = mac2id (pkt->dst); 569 int dst = mac2id (pkt->dst);
481 int src = mac2id (pkt->src); 570 int src = mac2id (pkt->src);
482 571
483 if (src != THISNODE->id) 572 if (src != THISNODE->id)
484 { 573 {
485 slog (L_ERR, _("FATAL: tap packet not originating on current node received, terminating.")); 574 slog (L_ERR, _("FATAL: tap packet not originating on current node received, exiting."));
486 exit (1); 575 exit (1);
487 } 576 }
488 577
489 if (dst == THISNODE->id) 578 if (dst == THISNODE->id)
490 { 579 {
491 slog (L_ERR, _("FATAL: tap packet destined for current node received, terminating.")); 580 slog (L_ERR, _("FATAL: tap packet destined for current node received, exiting."));
492 exit (1); 581 exit (1);
493 } 582 }
494 583
495 if (dst > conns.size ()) 584 if (dst > conns.size ())
496 slog (L_ERR, _("tap packet for unknown node %d received, ignoring."), dst); 585 slog (L_ERR, _("tap packet for unknown node %d received, ignoring."), dst);
… …
502 if (dst != THISNODE->id) 591 if (dst != THISNODE->id)
503 conns[dst - 1]->inject_data_packet (pkt); 592 conns[dst - 1]->inject_data_packet (pkt);
504 } 593 }
505 else 594 else
506 { 595 {
507 // broadcast, first check router, then self, then english 596 // broadcast, this is ugly, but due to the security policy
508 connection *router = find_router (); 597 // we have to connect to all hosts...
509
510 if (router)
511 router->inject_data_packet (pkt, true);
512 else
513 for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c) 598 for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)
514 if ((*c)->conf != THISNODE) 599 if ((*c)->conf != THISNODE)
515 (*c)->inject_data_packet (pkt); 600 (*c)->inject_data_packet (pkt);
516 } 601 }
517 } 602 }
518 603
519 delete pkt; 604 delete pkt;
520 } 605 }
… …
526 else 611 else
527 abort (); 612 abort ();
528} 613}
529 614
530void 615void
531vpn::event_cb (tstamp &ts) 616vpn::event_cb (time_watcher &w)
532{ 617{
533 if (events) 618 if (events)
534 { 619 {
535 if (events & EVENT_SHUTDOWN) 620 if (events & EVENT_SHUTDOWN)
536 { 621 {
… …
553 } 638 }
554 639
555 events = 0; 640 events = 0;
556 } 641 }
557 642
558 ts = TSTAMP_CANCEL; 643 w.at = TSTAMP_CANCEL;
559} 644}
560 645
561void 646void
562vpn::shutdown_all () 647vpn::shutdown_all ()
563{ 648{
… …
587 } 672 }
588} 673}
589 674
590connection *vpn::find_router () 675connection *vpn::find_router ()
591{ 676{
592 u32 prio = 0; 677 u32 prio = 1;
593 connection *router = 0; 678 connection *router = 0;
594 679
595 for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i) 680 for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)
596 { 681 {
597 connection *c = *i; 682 connection *c = *i;
598 683
599 if (c->conf->routerprio > prio 684 if (c->conf->routerprio > prio
600 && c->connectmode == conf_node::C_ALWAYS 685 && 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) 686 && c->ictx && c->octx
687 && c->conf != THISNODE) // redundant, since ictx==octx==0 always on thisnode
603 { 688 {
604 prio = c->conf->routerprio; 689 prio = c->conf->routerprio;
605 router = c; 690 router = c;
606 } 691 }
607 } 692 }
608 693
609 return router; 694 return router;
610} 695}
611 696
612void vpn::connect_request (int id) 697void vpn::send_connect_request (int id)
613{ 698{
614 connection *c = find_router (); 699 connection *c = find_router ();
615 700
616 if (c) 701 if (c)
617 c->connect_request (id); 702 c->send_connect_request (id);
618 //else // does not work, because all others must connect to the same router 703 else
619 // // no router found, aggressively connect to all routers 704 // no router found, aggressively connect to all routers
620 // for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i) 705 for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)
621 // if ((*i)->conf->routerprio) 706 if ((*i)->conf->routerprio && (*i)->conf != THISNODE)
622 // (*i)->establish_connection (); 707 (*i)->establish_connection ();
623} 708}
624 709
625void 710void
626connection::dump_status () 711connection::dump_status ()
627{ 712{
… …
644 729
645 slog (L_NOTICE, _("END status dump")); 730 slog (L_NOTICE, _("END status dump"));
646} 731}
647 732
648vpn::vpn (void) 733vpn::vpn (void)
649: event(this, &vpn::event_cb) 734: event (this, &vpn::event_cb)
650, udpv4_ev_watcher(this, &vpn::udpv4_ev) 735, udpv4_ev_watcher (this, &vpn::udpv4_ev)
651, ipv4_ev_watcher (this, &vpn::ipv4_ev) 736, ipv4_ev_watcher (this, &vpn::ipv4_ev)
652, tap_ev_watcher (this, &vpn::tap_ev)
653#if ENABLE_TCP 737#if ENABLE_TCP
654, tcpv4_accept_watcher(this, &vpn::tcpv4_accept) 738, tcpv4_ev_watcher (this, &vpn::tcpv4_ev)
655#endif 739#endif
740#if ENABLE_ICMP
741, icmpv4_ev_watcher(this, &vpn::icmpv4_ev)
742#endif
743, tap_ev_watcher (this, &vpn::tap_ev)
656{ 744{
657} 745}
658 746
659vpn::~vpn () 747vpn::~vpn ()
660{ 748{

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