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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 1.9 by pcg, Tue Apr 8 02:00:54 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 <arpa/inet.h>
35#include <netinet/in.h>
36#include <netinet/icmp.h>
36 37
37#include "pidfile.h" 38#include "pidfile.h"
38 39
39#include "connection.h" 40#include "connection.h"
40#include "util.h" 41#include "util.h"
… …
80 ipv4_fd = socket (PF_INET, SOCK_RAW, ::conf.ip_proto); 81 ipv4_fd = socket (PF_INET, SOCK_RAW, ::conf.ip_proto);
81 82
82 if (ipv4_fd < 0) 83 if (ipv4_fd < 0)
83 return -1; 84 return -1;
84 85
85 sockinfo si (THISNODE, PROT_IPv4);
86
87 if (bind (ipv4_fd, si.sav4 (), si.salenv4 ()))
88 {
89 slog (L_ERR, _("can't bind ipv4 socket on %s: %s"), (const char *)si, strerror (errno));
90 exit (1);
91 }
92
93#ifdef IP_MTU_DISCOVER 86#ifdef IP_MTU_DISCOVER
94 // this I really consider a linux bug. I am neither connected 87 // this I really consider a linux bug. I am neither connected
95 // nor do I fragment myself. Linux still sets DF and doesn't 88 // nor do I fragment myself. Linux still sets DF and doesn't
96 // fragment for me sometimes. 89 // fragment for me sometimes.
97 { 90 {
98 int oval = IP_PMTUDISC_DONT; 91 int oval = IP_PMTUDISC_DONT;
99 setsockopt (ipv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval); 92 setsockopt (ipv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);
100 } 93 }
101#endif 94#endif
102 95
96 sockinfo si (THISNODE, PROT_IPv4);
97
98 if (bind (ipv4_fd, si.sav4 (), si.salenv4 ()))
99 {
100 slog (L_ERR, _("can't bind ipv4 socket on %s: %s"), (const char *)si, strerror (errno));
101 exit (1);
102 }
103
103 ipv4_ev_watcher.start (ipv4_fd, POLLIN); 104 ipv4_ev_watcher.start (ipv4_fd, POLLIN);
104 } 105 }
105 106
106 udpv4_fd = -1; 107 udpv4_fd = -1;
107 108
… …
115 // standard daemon practise... 116 // standard daemon practise...
116 { 117 {
117 int oval = 1; 118 int oval = 1;
118 setsockopt (udpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval); 119 setsockopt (udpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);
119 } 120 }
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 }
128 121
129#ifdef IP_MTU_DISCOVER 122#ifdef IP_MTU_DISCOVER
130 // this I really consider a linux bug. I am neither connected 123 // this I really consider a linux bug. I am neither connected
131 // nor do I fragment myself. Linux still sets DF and doesn't 124 // nor do I fragment myself. Linux still sets DF and doesn't
132 // fragment for me sometimes. 125 // fragment for me sometimes.
… …
134 int oval = IP_PMTUDISC_DONT; 127 int oval = IP_PMTUDISC_DONT;
135 setsockopt (udpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval); 128 setsockopt (udpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);
136 } 129 }
137#endif 130#endif
138 131
132 sockinfo si (THISNODE, PROT_UDPv4);
133
134 if (bind (udpv4_fd, si.sav4 (), si.salenv4 ()))
135 {
136 slog (L_ERR, _("can't bind udpv4 on %s: %s"), (const char *)si, strerror (errno));
137 exit (1);
138 }
139
139 udpv4_ev_watcher.start (udpv4_fd, POLLIN); 140 udpv4_ev_watcher.start (udpv4_fd, POLLIN);
140 } 141 }
142
143 icmpv4_fd = -1;
144
145#if ENABLE_ICMP
146 if (THISNODE->protocols & PROT_ICMPv4)
147 {
148 icmpv4_fd = socket (PF_INET, SOCK_RAW, IPPROTO_ICMP);
149
150 if (icmpv4_fd < 0)
151 return -1;
152
153#ifdef ICMP_FILTER
154 {
155 icmp_filter oval;
156 oval.data = 0xffffffff;
157 if (::conf.icmp_type < 32)
158 oval.data &= ~(1 << ::conf.icmp_type);
159
160 setsockopt (icmpv4_fd, SOL_RAW, ICMP_FILTER, &oval, sizeof oval);
161 }
162#endif
163
164#ifdef IP_MTU_DISCOVER
165 // this I really consider a linux bug. I am neither connected
166 // nor do I fragment myself. Linux still sets DF and doesn't
167 // fragment for me sometimes.
168 {
169 int oval = IP_PMTUDISC_DONT;
170 setsockopt (udpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);
171 }
172#endif
173
174 sockinfo si (THISNODE, PROT_ICMPv4);
175
176 if (bind (icmpv4_fd, si.sav4 (), si.salenv4 ()))
177 {
178 slog (L_ERR, _("can't bind icmpv4 on %s: %s"), (const char *)si, strerror (errno));
179 exit (1);
180 }
181
182 icmpv4_ev_watcher.start (icmpv4_fd, POLLIN);
183 }
184#endif
141 185
142 tcpv4_fd = -1; 186 tcpv4_fd = -1;
143 187
144#if ENABLE_TCP 188#if ENABLE_TCP
145 if (THISNODE->protocols & PROT_TCPv4 && THISNODE->tcp_port) 189 if (THISNODE->protocols & PROT_TCPv4 && THISNODE->tcp_port)
… …
204#if ENABLE_TCP 248#if ENABLE_TCP
205 case PROT_TCPv4: 249 case PROT_TCPv4:
206 return send_tcpv4_packet (pkt, si, tos); 250 return send_tcpv4_packet (pkt, si, tos);
207#endif 251#endif
208 252
253#if ENABLE_ICMP
254 case PROT_ICMPv4:
255 return send_icmpv4_packet (pkt, si, tos);
256#endif
257
209 default: 258 default:
210 slog (L_CRIT, _("%s: FATAL: trying to send packet with unsupported protocol"), (const char *)si); 259 slog (L_CRIT, _("%s: FATAL: trying to send packet with unsupported protocol"), (const char *)si);
211 return false; 260 return false;
212 } 261 }
213} 262}
… …
215bool 264bool
216vpn::send_ipv4_packet (vpn_packet *pkt, const sockinfo &si, int tos) 265vpn::send_ipv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)
217{ 266{
218 setsockopt (ipv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos); 267 setsockopt (ipv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);
219 sendto (ipv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ()); 268 sendto (ipv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());
269
270 return true;
271}
272
273static u16
274ipv4_checksum (u16 *data, unsigned int len)
275{
276 // use 32 bit accumulator and fold back carry bits at the end
277 u32 sum = 0;
278
279 while (len > 1)
280 {
281 sum += *data++;
282 len -= 2;
283 }
284
285 // odd byte left?
286 if (len)
287 sum += *(u8 *)data;
288
289 // add back carry bits
290 sum = (sum >> 16) + (sum & 0xffff); // lo += hi
291 sum += (sum >> 16); // carry
292
293 return ~sum;
294}
295
296bool
297vpn::send_icmpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)
298{
299 setsockopt (icmpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);
300
301 pkt->unshift_hdr (4);
302
303 icmphdr *hdr = (icmphdr *)&((*pkt)[0]);
304 hdr->type = ::conf.icmp_type;
305 hdr->code = 255;
306 hdr->checksum = 0;
307 hdr->checksum = ipv4_checksum ((u16 *)hdr, pkt->len);
308
309 sendto (icmpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());
220 310
221 return true; 311 return true;
222} 312}
223 313
224bool 314bool
… …
269 c->recv_vpn_packet (pkt, rsi); 359 c->recv_vpn_packet (pkt, rsi);
270 } 360 }
271} 361}
272 362
273void 363void
274vpn::udpv4_ev (io_watcher &w, short revents) 364vpn::ipv4_ev (io_watcher &w, short revents)
275{ 365{
276 if (revents & (POLLIN | POLLERR)) 366 if (revents & (POLLIN | POLLERR))
277 { 367 {
278 vpn_packet *pkt = new vpn_packet; 368 vpn_packet *pkt = new vpn_packet;
279 struct sockaddr_in sa; 369 struct sockaddr_in sa;
280 socklen_t sa_len = sizeof (sa); 370 socklen_t sa_len = sizeof (sa);
281 int len; 371 int len;
282 372
283 len = recvfrom (w.fd, &((*pkt)[0]), MAXSIZE, 0, (sockaddr *)&sa, &sa_len); 373 len = recvfrom (w.fd, &((*pkt)[0]), MAXSIZE, 0, (sockaddr *)&sa, &sa_len);
284 374
285 sockinfo si(sa, PROT_UDPv4); 375 sockinfo si(sa, PROT_IPv4);
286 376
287 if (len > 0) 377 if (len > 0)
288 { 378 {
289 pkt->len = len; 379 pkt->len = len;
290 380
381 // raw sockets deliver the ipv4, but don't expect it on sends
382 // this is slow, but...
383 pkt->skip_hdr (IP_OVERHEAD);
384
291 recv_vpn_packet (pkt, si); 385 recv_vpn_packet (pkt, si);
292 } 386 }
293 else 387 else
294 { 388 {
295 // probably ECONNRESET or somesuch 389 // probably ECONNRESET or somesuch
296 slog (L_DEBUG, _("%s: fd %d, %s"), (const char *)si, w.fd, strerror (errno)); 390 slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno));
297 } 391 }
298 392
299 delete pkt; 393 delete pkt;
300 } 394 }
301 else if (revents & POLLHUP) 395 else if (revents & POLLHUP)
302 { 396 {
303 // this cannot ;) happen on udp sockets 397 // this cannot ;) happen on udp sockets
304 slog (L_ERR, _("FATAL: POLLHUP on udp v4 fd, terminating.")); 398 slog (L_ERR, _("FATAL: POLLHUP on ipv4 fd, terminating."));
305 exit (1); 399 exit (1);
306 } 400 }
307 else 401 else
308 { 402 {
309 slog (L_ERR, 403 slog (L_ERR,
… …
312 exit (1); 406 exit (1);
313 } 407 }
314} 408}
315 409
316void 410void
317vpn::ipv4_ev (io_watcher &w, short revents) 411vpn::icmpv4_ev (io_watcher &w, short revents)
318{ 412{
319 if (revents & (POLLIN | POLLERR)) 413 if (revents & (POLLIN | POLLERR))
320 { 414 {
321 vpn_packet *pkt = new vpn_packet; 415 vpn_packet *pkt = new vpn_packet;
322 struct sockaddr_in sa; 416 struct sockaddr_in sa;
323 socklen_t sa_len = sizeof (sa); 417 socklen_t sa_len = sizeof (sa);
324 int len; 418 int len;
325 419
326 len = recvfrom (w.fd, &((*pkt)[0]), MAXSIZE, 0, (sockaddr *)&sa, &sa_len); 420 len = recvfrom (w.fd, &((*pkt)[0]), MAXSIZE, 0, (sockaddr *)&sa, &sa_len);
327 421
328 sockinfo si(sa, PROT_IPv4); 422 sockinfo si(sa, PROT_ICMPv4);
329 423
330 if (len > 0) 424 if (len > 0)
331 { 425 {
332 pkt->len = len; 426 pkt->len = len;
333 427
428 icmphdr *hdr = (icmphdr *)&((*pkt)[IP_OVERHEAD]);
429
430 if (hdr->type == ::conf.icmp_type
431 && hdr->code == 255)
432 {
334 // raw sockets deliver the ipv4, but don't expect it on sends 433 // raw sockets deliver the ipv4, but don't expect it on sends
335 // this is slow, but... 434 // this is slow, but...
336 pkt->skip_hdr (IP_OVERHEAD); 435 pkt->skip_hdr (ICMP_OVERHEAD);
337 436
338 recv_vpn_packet (pkt, si); 437 recv_vpn_packet (pkt, si);
438 }
339 } 439 }
340 else 440 else
341 { 441 {
342 // probably ECONNRESET or somesuch 442 // probably ECONNRESET or somesuch
343 slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno)); 443 slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno));
… …
346 delete pkt; 446 delete pkt;
347 } 447 }
348 else if (revents & POLLHUP) 448 else if (revents & POLLHUP)
349 { 449 {
350 // this cannot ;) happen on udp sockets 450 // this cannot ;) happen on udp sockets
351 slog (L_ERR, _("FATAL: POLLHUP on ipv4 fd, terminating.")); 451 slog (L_ERR, _("FATAL: POLLHUP on icmpv4 fd, terminating."));
452 exit (1);
453 }
454 else
455 {
456 slog (L_ERR,
457 _("FATAL: unknown revents %08x in socket, terminating\n"),
458 revents);
459 exit (1);
460 }
461}
462
463void
464vpn::udpv4_ev (io_watcher &w, short revents)
465{
466 if (revents & (POLLIN | POLLERR))
467 {
468 vpn_packet *pkt = new vpn_packet;
469 struct sockaddr_in sa;
470 socklen_t sa_len = sizeof (sa);
471 int len;
472
473 len = recvfrom (w.fd, &((*pkt)[0]), MAXSIZE, 0, (sockaddr *)&sa, &sa_len);
474
475 sockinfo si(sa, PROT_UDPv4);
476
477 if (len > 0)
478 {
479 pkt->len = len;
480
481 recv_vpn_packet (pkt, si);
482 }
483 else
484 {
485 // probably ECONNRESET or somesuch
486 slog (L_DEBUG, _("%s: fd %d, %s"), (const char *)si, w.fd, strerror (errno));
487 }
488
489 delete pkt;
490 }
491 else if (revents & POLLHUP)
492 {
493 // this cannot ;) happen on udp sockets
494 slog (L_ERR, _("FATAL: POLLHUP on udp v4 fd, terminating."));
352 exit (1); 495 exit (1);
353 } 496 }
354 else 497 else
355 { 498 {
356 slog (L_ERR, 499 slog (L_ERR,
… …
537 680
538 slog (L_NOTICE, _("END status dump")); 681 slog (L_NOTICE, _("END status dump"));
539} 682}
540 683
541vpn::vpn (void) 684vpn::vpn (void)
542: event(this, &vpn::event_cb) 685: event (this, &vpn::event_cb)
543, udpv4_ev_watcher(this, &vpn::udpv4_ev) 686, udpv4_ev_watcher (this, &vpn::udpv4_ev)
544, ipv4_ev_watcher (this, &vpn::ipv4_ev) 687, ipv4_ev_watcher (this, &vpn::ipv4_ev)
545, tap_ev_watcher (this, &vpn::tap_ev)
546#if ENABLE_TCP 688#if ENABLE_TCP
547, tcpv4_ev_watcher(this, &vpn::tcpv4_ev) 689, tcpv4_ev_watcher (this, &vpn::tcpv4_ev)
548#endif 690#endif
691#if ENABLE_ICMP
692, icmpv4_ev_watcher(this, &vpn::icmpv4_ev)
693#endif
694, tap_ev_watcher (this, &vpn::tap_ev)
549{ 695{
550} 696}
551 697
552vpn::~vpn () 698vpn::~vpn ()
553{ 699{

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