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Comparing gvpe/src/vpn.C (file contents):
Revision 1.10 by pcg, Tue Apr 8 03:25:35 2003 UTC vs.
Revision 1.15 by pcg, Tue Oct 14 15:48:15 2003 UTC

… …
29#include <sys/poll.h> 29#include <sys/poll.h>
30#include <sys/wait.h> 30#include <sys/wait.h>
31#include <errno.h> 31#include <errno.h>
32#include <time.h> 32#include <time.h>
33#include <unistd.h> 33#include <unistd.h>
34#include <arpa/inet.h> 34#include <fcntl.h>
35#include <netinet/in.h> 35#include <sys/socket.h>
36#include <netinet/ip_icmp.h> 36
37#include "netcompat.h"
37 38
38#include "pidfile.h" 39#include "pidfile.h"
39 40
40#include "connection.h" 41#include "connection.h"
41#include "util.h" 42#include "util.h"
… …
81 ipv4_fd = socket (PF_INET, SOCK_RAW, ::conf.ip_proto); 82 ipv4_fd = socket (PF_INET, SOCK_RAW, ::conf.ip_proto);
82 83
83 if (ipv4_fd < 0) 84 if (ipv4_fd < 0)
84 return -1; 85 return -1;
85 86
86#ifdef IP_MTU_DISCOVER 87 fcntl (ipv4_fd, F_SETFL, O_NONBLOCK);
88
89#if defined(SOL_IP) && defined(IP_MTU_DISCOVER)
87 // this I really consider a linux bug. I am neither connected 90 // this I really consider a linux bug. I am neither connected
88 // 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
89 // fragment for me sometimes. 92 // fragment for me sometimes.
90 { 93 {
91 int oval = IP_PMTUDISC_DONT; 94 int oval = IP_PMTUDISC_DONT;
… …
111 udpv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP); 114 udpv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP);
112 115
113 if (udpv4_fd < 0) 116 if (udpv4_fd < 0)
114 return -1; 117 return -1;
115 118
119 fcntl (udpv4_fd, F_SETFL, O_NONBLOCK);
120
116 // standard daemon practise... 121 // standard daemon practise...
117 { 122 {
118 int oval = 1; 123 int oval = 1;
119 setsockopt (udpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval); 124 setsockopt (udpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);
120 } 125 }
121 126
122#ifdef IP_MTU_DISCOVER 127#if defined(SOL_IP) && defined(IP_MTU_DISCOVER)
123 // this I really consider a linux bug. I am neither connected 128 // this I really consider a linux bug. I am neither connected
124 // 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
125 // fragment for me sometimes. 130 // fragment for me sometimes.
126 { 131 {
127 int oval = IP_PMTUDISC_DONT; 132 int oval = IP_PMTUDISC_DONT;
… …
148 icmpv4_fd = socket (PF_INET, SOCK_RAW, IPPROTO_ICMP); 153 icmpv4_fd = socket (PF_INET, SOCK_RAW, IPPROTO_ICMP);
149 154
150 if (icmpv4_fd < 0) 155 if (icmpv4_fd < 0)
151 return -1; 156 return -1;
152 157
158 fcntl (icmpv4_fd, F_SETFL, O_NONBLOCK);
159
153#ifdef ICMP_FILTER 160#ifdef ICMP_FILTER
154 { 161 {
155 icmp_filter oval; 162 icmp_filter oval;
156 oval.data = 0xffffffff; 163 oval.data = 0xffffffff;
157 if (::conf.icmp_type < 32) 164 if (::conf.icmp_type < 32)
… …
159 166
160 setsockopt (icmpv4_fd, SOL_RAW, ICMP_FILTER, &oval, sizeof oval); 167 setsockopt (icmpv4_fd, SOL_RAW, ICMP_FILTER, &oval, sizeof oval);
161 } 168 }
162#endif 169#endif
163 170
164#ifdef IP_MTU_DISCOVER 171#if defined(SOL_IP) && defined(IP_MTU_DISCOVER)
165 // this I really consider a linux bug. I am neither connected 172 // this I really consider a linux bug. I am neither connected
166 // 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
167 // fragment for me sometimes. 174 // fragment for me sometimes.
168 { 175 {
169 int oval = IP_PMTUDISC_DONT; 176 int oval = IP_PMTUDISC_DONT;
… …
191 tcpv4_fd = socket (PF_INET, SOCK_STREAM, IPPROTO_TCP); 198 tcpv4_fd = socket (PF_INET, SOCK_STREAM, IPPROTO_TCP);
192 199
193 if (tcpv4_fd < 0) 200 if (tcpv4_fd < 0)
194 return -1; 201 return -1;
195 202
203 fcntl (tcpv4_fd, F_SETFL, O_NONBLOCK);
204
196 // standard daemon practise... 205 // standard daemon practise...
197 { 206 {
198 int oval = 1; 207 int oval = 1;
199 setsockopt (tcpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval); 208 setsockopt (tcpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);
200 } 209 }
… …
262} 271}
263 272
264bool 273bool
265vpn::send_ipv4_packet (vpn_packet *pkt, const sockinfo &si, int tos) 274vpn::send_ipv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)
266{ 275{
276#if defined(SOL_IP) && defined(IP_TOS)
267 setsockopt (ipv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos); 277 setsockopt (ipv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);
278#endif
268 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 ());
269 280
270 return true; 281 return true;
271} 282}
272 283
… …
291 sum += (sum >> 16); // carry 302 sum += (sum >> 16); // carry
292 303
293 return ~sum; 304 return ~sum;
294} 305}
295 306
307#if ENABLE_ICMP
296bool 308bool
297vpn::send_icmpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos) 309vpn::send_icmpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)
298{ 310{
311#if defined(SOL_IP) && defined(IP_TOS)
299 setsockopt (icmpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos); 312 setsockopt (icmpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);
313#endif
300 314
301 pkt->unshift_hdr (4); 315 pkt->unshift_hdr (4);
302 316
303 icmphdr *hdr = (icmphdr *)&((*pkt)[0]); 317 icmp_header *hdr = (icmp_header *)&((*pkt)[0]);
304 hdr->type = ::conf.icmp_type; 318 hdr->type = ::conf.icmp_type;
305 hdr->code = 255; 319 hdr->code = 255;
306 hdr->checksum = 0; 320 hdr->checksum = 0;
307 hdr->checksum = ipv4_checksum ((u16 *)hdr, pkt->len); 321 hdr->checksum = ipv4_checksum ((u16 *)hdr, pkt->len);
308 322
309 sendto (icmpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ()); 323 sendto (icmpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());
310 324
311 return true; 325 return true;
312} 326}
327#endif
313 328
314bool 329bool
315vpn::send_udpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos) 330vpn::send_udpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)
316{ 331{
332#if defined(SOL_IP) && defined(IP_TOS)
317 setsockopt (udpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos); 333 setsockopt (udpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);
334#endif
318 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 ());
319 336
320 return true; 337 return true;
321} 338}
322 339
… …
339 (const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ()); 356 (const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ());
340 else 357 else
341 { 358 {
342 connection *c = conns[src - 1]; 359 connection *c = conns[src - 1];
343 360
344 if (dst == 0 && !THISNODE->routerprio) 361 if (dst == 0)
345 slog (L_WARN, _("%s(%s): received broadcast, but we are no router"), 362 slog (L_WARN, _("%s(%s): received broadcast (protocol violation)"),
346 c->conf->nodename, (const char *)rsi); 363 c->conf->nodename, (const char *)rsi);
347 else if (dst != 0 && dst != THISNODE->id) 364 else if (dst != 0 && dst != THISNODE->id)
348 { 365 {
349 if (THISNODE->routerprio) 366 if (THISNODE->routerprio)
350 // the tos setting gets lost here. who cares. 367 // the tos setting gets lost here. who cares.
… …
405 revents); 422 revents);
406 exit (1); 423 exit (1);
407 } 424 }
408} 425}
409 426
427#if ENABLE_ICMP
410void 428void
411vpn::icmpv4_ev (io_watcher &w, short revents) 429vpn::icmpv4_ev (io_watcher &w, short revents)
412{ 430{
413 if (revents & (POLLIN | POLLERR)) 431 if (revents & (POLLIN | POLLERR))
414 { 432 {
… …
423 441
424 if (len > 0) 442 if (len > 0)
425 { 443 {
426 pkt->len = len; 444 pkt->len = len;
427 445
428 icmphdr *hdr = (icmphdr *)&((*pkt)[IP_OVERHEAD]); 446 icmp_header *hdr = (icmp_header *)&((*pkt)[IP_OVERHEAD]);
429 447
430 if (hdr->type == ::conf.icmp_type 448 if (hdr->type == ::conf.icmp_type
431 && hdr->code == 255) 449 && hdr->code == 255)
432 { 450 {
433 // raw sockets deliver the ipv4, but don't expect it on sends 451 // raw sockets deliver the ipv4, but don't expect it on sends
… …
457 _("FATAL: unknown revents %08x in socket, terminating\n"), 475 _("FATAL: unknown revents %08x in socket, terminating\n"),
458 revents); 476 revents);
459 exit (1); 477 exit (1);
460 } 478 }
461} 479}
480#endif
462 481
463void 482void
464vpn::udpv4_ev (io_watcher &w, short revents) 483vpn::udpv4_ev (io_watcher &w, short revents)
465{ 484{
466 if (revents & (POLLIN | POLLERR)) 485 if (revents & (POLLIN | POLLERR))
… …
516 int dst = mac2id (pkt->dst); 535 int dst = mac2id (pkt->dst);
517 int src = mac2id (pkt->src); 536 int src = mac2id (pkt->src);
518 537
519 if (src != THISNODE->id) 538 if (src != THISNODE->id)
520 { 539 {
521 slog (L_ERR, _("FATAL: tap packet not originating on current node received, terminating.")); 540 slog (L_ERR, _("FATAL: tap packet not originating on current node received, exiting."));
522 exit (1); 541 exit (1);
523 } 542 }
524 543
525 if (dst == THISNODE->id) 544 if (dst == THISNODE->id)
526 { 545 {
527 slog (L_ERR, _("FATAL: tap packet destined for current node received, terminating.")); 546 slog (L_ERR, _("FATAL: tap packet destined for current node received, exiting."));
528 exit (1); 547 exit (1);
529 } 548 }
530 549
531 if (dst > conns.size ()) 550 if (dst > conns.size ())
532 slog (L_ERR, _("tap packet for unknown node %d received, ignoring."), dst); 551 slog (L_ERR, _("tap packet for unknown node %d received, ignoring."), dst);
… …
538 if (dst != THISNODE->id) 557 if (dst != THISNODE->id)
539 conns[dst - 1]->inject_data_packet (pkt); 558 conns[dst - 1]->inject_data_packet (pkt);
540 } 559 }
541 else 560 else
542 { 561 {
543 // broadcast, first check router, then self, then english 562 // broadcast, this is ugly, but due to the security policy
544 connection *router = find_router (); 563 // we have to connect to all hosts...
545
546 if (router)
547 router->inject_data_packet (pkt, true);
548 else
549 for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c) 564 for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)
550 if ((*c)->conf != THISNODE) 565 if ((*c)->conf != THISNODE)
551 (*c)->inject_data_packet (pkt); 566 (*c)->inject_data_packet (pkt);
552 } 567 }
553 } 568 }
554 569
555 delete pkt; 570 delete pkt;
556 } 571 }
… …
623 } 638 }
624} 639}
625 640
626connection *vpn::find_router () 641connection *vpn::find_router ()
627{ 642{
628 u32 prio = 0; 643 u32 prio = 1;
629 connection *router = 0; 644 connection *router = 0;
630 645
631 for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i) 646 for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)
632 { 647 {
633 connection *c = *i; 648 connection *c = *i;
634 649
635 if (c->conf->routerprio > prio 650 if (c->conf->routerprio > prio
636 && c->connectmode == conf_node::C_ALWAYS 651 && c->connectmode == conf_node::C_ALWAYS // so we don't drop the connection if in use
637 && c->conf != THISNODE
638 && c->ictx && c->octx) 652 && c->ictx && c->octx
653 && c->conf != THISNODE) // redundant, since ictx==octx==0 always on thisnode
639 { 654 {
640 prio = c->conf->routerprio; 655 prio = c->conf->routerprio;
641 router = c; 656 router = c;
642 } 657 }
643 } 658 }
… …
652 if (c) 667 if (c)
653 c->send_connect_request (id); 668 c->send_connect_request (id);
654 else 669 else
655 // no router found, aggressively connect to all routers 670 // no router found, aggressively connect to all routers
656 for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i) 671 for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)
657 if ((*i)->conf->routerprio) 672 if ((*i)->conf->routerprio && (*i)->conf != THISNODE)
658 (*i)->establish_connection (); 673 (*i)->establish_connection ();
659} 674}
660 675
661void 676void
662connection::dump_status () 677connection::dump_status ()

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