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Comparing gvpe/src/vpn.C (file contents):
Revision 1.8 by pcg, Mon Apr 7 01:28:56 2003 UTC vs.
Revision 1.11 by pcg, Sun Apr 13 00:35:46 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 <arpa/inet.h>
36#include <netinet/in.h>
37#include <netinet/ip_icmp.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"
… …
80 ipv4_fd = socket (PF_INET, SOCK_RAW, ::conf.ip_proto); 82 ipv4_fd = socket (PF_INET, SOCK_RAW, ::conf.ip_proto);
81 83
82 if (ipv4_fd < 0) 84 if (ipv4_fd < 0)
83 return -1; 85 return -1;
84 86
85 sockinfo si (THISNODE, PROT_IPv4); 87 fcntl (ipv4_fd, F_SETFL, O_NONBLOCK);
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 88
93#ifdef IP_MTU_DISCOVER 89#ifdef IP_MTU_DISCOVER
94 // this I really consider a linux bug. I am neither connected 90 // this I really consider a linux bug. I am neither connected
95 // nor do I fragment myself. Linux still sets DF and doesn't 91 // nor do I fragment myself. Linux still sets DF and doesn't
96 // fragment for me sometimes. 92 // fragment for me sometimes.
… …
98 int oval = IP_PMTUDISC_DONT; 94 int oval = IP_PMTUDISC_DONT;
99 setsockopt (ipv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval); 95 setsockopt (ipv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);
100 } 96 }
101#endif 97#endif
102 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
103 ipv4_ev_watcher.start (ipv4_fd, POLLIN); 107 ipv4_ev_watcher.start (ipv4_fd, POLLIN);
104 } 108 }
105 109
106 udpv4_fd = -1; 110 udpv4_fd = -1;
107 111
… …
109 { 113 {
110 udpv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP); 114 udpv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP);
111 115
112 if (udpv4_fd < 0) 116 if (udpv4_fd < 0)
113 return -1; 117 return -1;
118
119 fcntl (udpv4_fd, F_SETFL, O_NONBLOCK);
114 120
115 // standard daemon practise... 121 // standard daemon practise...
116 { 122 {
117 int oval = 1; 123 int oval = 1;
118 setsockopt (udpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval); 124 setsockopt (udpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);
119 } 125 }
120
121 sockinfo si (THISNODE, PROT_UDPv4);
122
123 if (bind (udpv4_fd, si.sav4 (), si.salenv4 ()))
124 {
125 slog (L_ERR, _("can't bind udpv4 on %s: %s"), (const char *)si, strerror (errno));
126 exit (1);
127 }
128 126
129#ifdef IP_MTU_DISCOVER 127#ifdef IP_MTU_DISCOVER
130 // this I really consider a linux bug. I am neither connected 128 // this I really consider a linux bug. I am neither connected
131 // 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
132 // fragment for me sometimes. 130 // fragment for me sometimes.
… …
134 int oval = IP_PMTUDISC_DONT; 132 int oval = IP_PMTUDISC_DONT;
135 setsockopt (udpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval); 133 setsockopt (udpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);
136 } 134 }
137#endif 135#endif
138 136
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
139 udpv4_ev_watcher.start (udpv4_fd, POLLIN); 145 udpv4_ev_watcher.start (udpv4_fd, POLLIN);
140 } 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
161 {
162 icmp_filter oval;
163 oval.data = 0xffffffff;
164 if (::conf.icmp_type < 32)
165 oval.data &= ~(1 << ::conf.icmp_type);
166
167 setsockopt (icmpv4_fd, SOL_RAW, ICMP_FILTER, &oval, sizeof oval);
168 }
169#endif
170
171#ifdef IP_MTU_DISCOVER
172 // this I really consider a linux bug. I am neither connected
173 // nor do I fragment myself. Linux still sets DF and doesn't
174 // fragment for me sometimes.
175 {
176 int oval = IP_PMTUDISC_DONT;
177 setsockopt (udpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);
178 }
179#endif
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
189 icmpv4_ev_watcher.start (icmpv4_fd, POLLIN);
190 }
191#endif
141 192
142 tcpv4_fd = -1; 193 tcpv4_fd = -1;
143 194
144#if ENABLE_TCP 195#if ENABLE_TCP
145 if (THISNODE->protocols & PROT_TCPv4 && THISNODE->tcp_port) 196 if (THISNODE->protocols & PROT_TCPv4 && THISNODE->tcp_port)
146 { 197 {
147 tcpv4_fd = socket (PF_INET, SOCK_STREAM, IPPROTO_TCP); 198 tcpv4_fd = socket (PF_INET, SOCK_STREAM, IPPROTO_TCP);
148 199
149 if (tcpv4_fd < 0) 200 if (tcpv4_fd < 0)
150 return -1; 201 return -1;
202
203 fcntl (tcpv4_fd, F_SETFL, O_NONBLOCK);
151 204
152 // standard daemon practise... 205 // standard daemon practise...
153 { 206 {
154 int oval = 1; 207 int oval = 1;
155 setsockopt (tcpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval); 208 setsockopt (tcpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);
… …
204#if ENABLE_TCP 257#if ENABLE_TCP
205 case PROT_TCPv4: 258 case PROT_TCPv4:
206 return send_tcpv4_packet (pkt, si, tos); 259 return send_tcpv4_packet (pkt, si, tos);
207#endif 260#endif
208 261
262#if ENABLE_ICMP
263 case PROT_ICMPv4:
264 return send_icmpv4_packet (pkt, si, tos);
265#endif
266
209 default: 267 default:
210 slog (L_CRIT, _("%s: FATAL: trying to send packet with unsupported protocol"), (const char *)si); 268 slog (L_CRIT, _("%s: FATAL: trying to send packet with unsupported protocol"), (const char *)si);
211 return false; 269 return false;
212 } 270 }
213} 271}
… …
215bool 273bool
216vpn::send_ipv4_packet (vpn_packet *pkt, const sockinfo &si, int tos) 274vpn::send_ipv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)
217{ 275{
218 setsockopt (ipv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos); 276 setsockopt (ipv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);
219 sendto (ipv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ()); 277 sendto (ipv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());
278
279 return true;
280}
281
282static u16
283ipv4_checksum (u16 *data, unsigned int len)
284{
285 // use 32 bit accumulator and fold back carry bits at the end
286 u32 sum = 0;
287
288 while (len > 1)
289 {
290 sum += *data++;
291 len -= 2;
292 }
293
294 // odd byte left?
295 if (len)
296 sum += *(u8 *)data;
297
298 // add back carry bits
299 sum = (sum >> 16) + (sum & 0xffff); // lo += hi
300 sum += (sum >> 16); // carry
301
302 return ~sum;
303}
304
305bool
306vpn::send_icmpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)
307{
308 setsockopt (icmpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);
309
310 pkt->unshift_hdr (4);
311
312 icmphdr *hdr = (icmphdr *)&((*pkt)[0]);
313 hdr->type = ::conf.icmp_type;
314 hdr->code = 255;
315 hdr->checksum = 0;
316 hdr->checksum = ipv4_checksum ((u16 *)hdr, pkt->len);
317
318 sendto (icmpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());
220 319
221 return true; 320 return true;
222} 321}
223 322
224bool 323bool
… …
269 c->recv_vpn_packet (pkt, rsi); 368 c->recv_vpn_packet (pkt, rsi);
270 } 369 }
271} 370}
272 371
273void 372void
274vpn::udpv4_ev (io_watcher &w, short revents) 373vpn::ipv4_ev (io_watcher &w, short revents)
275{ 374{
276 if (revents & (POLLIN | POLLERR)) 375 if (revents & (POLLIN | POLLERR))
277 { 376 {
278 vpn_packet *pkt = new vpn_packet; 377 vpn_packet *pkt = new vpn_packet;
279 struct sockaddr_in sa; 378 struct sockaddr_in sa;
280 socklen_t sa_len = sizeof (sa); 379 socklen_t sa_len = sizeof (sa);
281 int len; 380 int len;
282 381
283 len = recvfrom (w.fd, &((*pkt)[0]), MAXSIZE, 0, (sockaddr *)&sa, &sa_len); 382 len = recvfrom (w.fd, &((*pkt)[0]), MAXSIZE, 0, (sockaddr *)&sa, &sa_len);
284 383
285 sockinfo si(sa, PROT_UDPv4); 384 sockinfo si(sa, PROT_IPv4);
286 385
287 if (len > 0) 386 if (len > 0)
288 { 387 {
289 pkt->len = len; 388 pkt->len = len;
290 389
390 // raw sockets deliver the ipv4, but don't expect it on sends
391 // this is slow, but...
392 pkt->skip_hdr (IP_OVERHEAD);
393
291 recv_vpn_packet (pkt, si); 394 recv_vpn_packet (pkt, si);
292 } 395 }
293 else 396 else
294 { 397 {
295 // probably ECONNRESET or somesuch 398 // probably ECONNRESET or somesuch
296 slog (L_DEBUG, _("%s: fd %d, %s"), (const char *)si, w.fd, strerror (errno)); 399 slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno));
297 } 400 }
298 401
299 delete pkt; 402 delete pkt;
300 } 403 }
301 else if (revents & POLLHUP) 404 else if (revents & POLLHUP)
302 { 405 {
303 // this cannot ;) happen on udp sockets 406 // this cannot ;) happen on udp sockets
304 slog (L_ERR, _("FATAL: POLLHUP on udp v4 fd, terminating.")); 407 slog (L_ERR, _("FATAL: POLLHUP on ipv4 fd, terminating."));
305 exit (1); 408 exit (1);
306 } 409 }
307 else 410 else
308 { 411 {
309 slog (L_ERR, 412 slog (L_ERR,
… …
312 exit (1); 415 exit (1);
313 } 416 }
314} 417}
315 418
316void 419void
317vpn::ipv4_ev (io_watcher &w, short revents) 420vpn::icmpv4_ev (io_watcher &w, short revents)
318{ 421{
319 if (revents & (POLLIN | POLLERR)) 422 if (revents & (POLLIN | POLLERR))
320 { 423 {
321 vpn_packet *pkt = new vpn_packet; 424 vpn_packet *pkt = new vpn_packet;
322 struct sockaddr_in sa; 425 struct sockaddr_in sa;
323 socklen_t sa_len = sizeof (sa); 426 socklen_t sa_len = sizeof (sa);
324 int len; 427 int len;
325 428
326 len = recvfrom (w.fd, &((*pkt)[0]), MAXSIZE, 0, (sockaddr *)&sa, &sa_len); 429 len = recvfrom (w.fd, &((*pkt)[0]), MAXSIZE, 0, (sockaddr *)&sa, &sa_len);
327 430
328 sockinfo si(sa, PROT_IPv4); 431 sockinfo si(sa, PROT_ICMPv4);
329 432
330 if (len > 0) 433 if (len > 0)
331 { 434 {
332 pkt->len = len; 435 pkt->len = len;
333 436
437 icmphdr *hdr = (icmphdr *)&((*pkt)[IP_OVERHEAD]);
438
439 if (hdr->type == ::conf.icmp_type
440 && hdr->code == 255)
441 {
334 // raw sockets deliver the ipv4, but don't expect it on sends 442 // raw sockets deliver the ipv4, but don't expect it on sends
335 // this is slow, but... 443 // this is slow, but...
336 pkt->skip_hdr (IP_OVERHEAD); 444 pkt->skip_hdr (ICMP_OVERHEAD);
337 445
338 recv_vpn_packet (pkt, si); 446 recv_vpn_packet (pkt, si);
447 }
339 } 448 }
340 else 449 else
341 { 450 {
342 // probably ECONNRESET or somesuch 451 // probably ECONNRESET or somesuch
343 slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno)); 452 slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno));
… …
346 delete pkt; 455 delete pkt;
347 } 456 }
348 else if (revents & POLLHUP) 457 else if (revents & POLLHUP)
349 { 458 {
350 // this cannot ;) happen on udp sockets 459 // this cannot ;) happen on udp sockets
351 slog (L_ERR, _("FATAL: POLLHUP on ipv4 fd, terminating.")); 460 slog (L_ERR, _("FATAL: POLLHUP on icmpv4 fd, terminating."));
461 exit (1);
462 }
463 else
464 {
465 slog (L_ERR,
466 _("FATAL: unknown revents %08x in socket, terminating\n"),
467 revents);
468 exit (1);
469 }
470}
471
472void
473vpn::udpv4_ev (io_watcher &w, short revents)
474{
475 if (revents & (POLLIN | POLLERR))
476 {
477 vpn_packet *pkt = new vpn_packet;
478 struct sockaddr_in sa;
479 socklen_t sa_len = sizeof (sa);
480 int len;
481
482 len = recvfrom (w.fd, &((*pkt)[0]), MAXSIZE, 0, (sockaddr *)&sa, &sa_len);
483
484 sockinfo si(sa, PROT_UDPv4);
485
486 if (len > 0)
487 {
488 pkt->len = len;
489
490 recv_vpn_packet (pkt, si);
491 }
492 else
493 {
494 // probably ECONNRESET or somesuch
495 slog (L_DEBUG, _("%s: fd %d, %s"), (const char *)si, w.fd, strerror (errno));
496 }
497
498 delete pkt;
499 }
500 else if (revents & POLLHUP)
501 {
502 // this cannot ;) happen on udp sockets
503 slog (L_ERR, _("FATAL: POLLHUP on udp v4 fd, terminating."));
352 exit (1); 504 exit (1);
353 } 505 }
354 else 506 else
355 { 507 {
356 slog (L_ERR, 508 slog (L_ERR,
… …
488 for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i) 640 for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)
489 { 641 {
490 connection *c = *i; 642 connection *c = *i;
491 643
492 if (c->conf->routerprio > prio 644 if (c->conf->routerprio > prio
493 && c->connectmode == conf_node::C_ALWAYS 645 && c->connectmode == conf_node::C_ALWAYS // so we don't drop the connection if in use
494 && c->conf != THISNODE
495 && c->ictx && c->octx) 646 && c->ictx && c->octx
647 && c->conf != THISNODE // redundant, since ictx==octx==0 always on thisnode
648 && (!THISNODE->routerprio
649 || c->conf->routerprio <= THISNODE->routerprio))
496 { 650 {
497 prio = c->conf->routerprio; 651 prio = c->conf->routerprio;
498 router = c; 652 router = c;
499 } 653 }
500 } 654 }
… …
537 691
538 slog (L_NOTICE, _("END status dump")); 692 slog (L_NOTICE, _("END status dump"));
539} 693}
540 694
541vpn::vpn (void) 695vpn::vpn (void)
542: event(this, &vpn::event_cb) 696: event (this, &vpn::event_cb)
543, udpv4_ev_watcher(this, &vpn::udpv4_ev) 697, udpv4_ev_watcher (this, &vpn::udpv4_ev)
544, ipv4_ev_watcher (this, &vpn::ipv4_ev) 698, ipv4_ev_watcher (this, &vpn::ipv4_ev)
545, tap_ev_watcher (this, &vpn::tap_ev)
546#if ENABLE_TCP 699#if ENABLE_TCP
547, tcpv4_ev_watcher(this, &vpn::tcpv4_ev) 700, tcpv4_ev_watcher (this, &vpn::tcpv4_ev)
548#endif 701#endif
702#if ENABLE_ICMP
703, icmpv4_ev_watcher(this, &vpn::icmpv4_ev)
704#endif
705, tap_ev_watcher (this, &vpn::tap_ev)
549{ 706{
550} 707}
551 708
552vpn::~vpn () 709vpn::~vpn ()
553{ 710{

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