1 | /* |
1 | /* |
2 | vpn.C -- handle the protocol, encryption, handshaking etc. |
2 | vpn.C -- handle the protocol, encryption, handshaking etc. |
3 | Copyright (C) 2003-2004 Marc Lehmann <pcg@goof.com> |
3 | Copyright (C) 2003-2005 Marc Lehmann <gvpe@schmorp.de> |
4 | |
4 | |
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5 | This file is part of GVPE. |
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6 | |
5 | This program is free software; you can redistribute it and/or modify |
7 | GVPE is free software; you can redistribute it and/or modify |
6 | it under the terms of the GNU General Public License as published by |
8 | it under the terms of the GNU General Public License as published by |
7 | the Free Software Foundation; either version 2 of the License, or |
9 | the Free Software Foundation; either version 2 of the License, or |
8 | (at your option) any later version. |
10 | (at your option) any later version. |
9 | |
11 | |
10 | This program is distributed in the hope that it will be useful, |
12 | This program is distributed in the hope that it will be useful, |
11 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
13 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
13 | GNU General Public License for more details. |
15 | GNU General Public License for more details. |
14 | |
16 | |
15 | You should have received a copy of the GNU General Public License |
17 | You should have received a copy of the GNU General Public License |
16 | along with this program; if not, write to the Free Software |
18 | along with gvpe; if not, write to the Free Software |
17 | Foundation, Inc. 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
19 | Foundation, Inc. 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
18 | */ |
20 | */ |
19 | |
21 | |
20 | #include "config.h" |
22 | #include "config.h" |
21 | |
23 | |
22 | #include <list> |
24 | #include <list> |
23 | |
25 | |
|
|
26 | #include <cstdio> |
|
|
27 | #include <cstring> |
24 | #include <cstdlib> |
28 | #include <cstdlib> |
25 | #include <cstring> |
|
|
26 | #include <cstdio> |
|
|
27 | |
29 | |
28 | #include <sys/types.h> |
30 | #include <sys/types.h> |
29 | #include <sys/socket.h> |
31 | #include <sys/socket.h> |
30 | #include <sys/wait.h> |
32 | #include <sys/wait.h> |
31 | #include <errno.h> |
33 | #include <errno.h> |
… | |
… | |
98 | sockinfo si (THISNODE, PROT_IPv4); |
100 | sockinfo si (THISNODE, PROT_IPv4); |
99 | |
101 | |
100 | if (bind (ipv4_fd, si.sav4 (), si.salenv4 ())) |
102 | if (bind (ipv4_fd, si.sav4 (), si.salenv4 ())) |
101 | { |
103 | { |
102 | slog (L_ERR, _("can't bind ipv4 socket on %s: %s"), (const char *)si, strerror (errno)); |
104 | slog (L_ERR, _("can't bind ipv4 socket on %s: %s"), (const char *)si, strerror (errno)); |
103 | exit (1); |
105 | exit (EXIT_FAILURE); |
104 | } |
106 | } |
105 | |
107 | |
106 | ipv4_ev_watcher.start (ipv4_fd, EVENT_READ); |
108 | ipv4_ev_watcher.start (ipv4_fd, EVENT_READ); |
107 | } |
109 | } |
108 | |
110 | |
… | |
… | |
136 | sockinfo si (THISNODE, PROT_UDPv4); |
138 | sockinfo si (THISNODE, PROT_UDPv4); |
137 | |
139 | |
138 | if (bind (udpv4_fd, si.sav4 (), si.salenv4 ())) |
140 | if (bind (udpv4_fd, si.sav4 (), si.salenv4 ())) |
139 | { |
141 | { |
140 | slog (L_ERR, _("can't bind udpv4 on %s: %s"), (const char *)si, strerror (errno)); |
142 | slog (L_ERR, _("can't bind udpv4 on %s: %s"), (const char *)si, strerror (errno)); |
141 | exit (1); |
143 | exit (EXIT_FAILURE); |
142 | } |
144 | } |
143 | |
145 | |
144 | udpv4_ev_watcher.start (udpv4_fd, EVENT_READ); |
146 | udpv4_ev_watcher.start (udpv4_fd, EVENT_READ); |
145 | } |
147 | } |
146 | |
148 | |
… | |
… | |
180 | sockinfo si (THISNODE, PROT_ICMPv4); |
182 | sockinfo si (THISNODE, PROT_ICMPv4); |
181 | |
183 | |
182 | if (bind (icmpv4_fd, si.sav4 (), si.salenv4 ())) |
184 | if (bind (icmpv4_fd, si.sav4 (), si.salenv4 ())) |
183 | { |
185 | { |
184 | slog (L_ERR, _("can't bind icmpv4 on %s: %s"), (const char *)si, strerror (errno)); |
186 | slog (L_ERR, _("can't bind icmpv4 on %s: %s"), (const char *)si, strerror (errno)); |
185 | exit (1); |
187 | exit (EXIT_FAILURE); |
186 | } |
188 | } |
187 | |
189 | |
188 | icmpv4_ev_watcher.start (icmpv4_fd, EVENT_READ); |
190 | icmpv4_ev_watcher.start (icmpv4_fd, EVENT_READ); |
189 | } |
191 | } |
190 | #endif |
192 | #endif |
… | |
… | |
210 | sockinfo si (THISNODE, PROT_TCPv4); |
212 | sockinfo si (THISNODE, PROT_TCPv4); |
211 | |
213 | |
212 | if (bind (tcpv4_fd, si.sav4 (), si.salenv4 ())) |
214 | if (bind (tcpv4_fd, si.sav4 (), si.salenv4 ())) |
213 | { |
215 | { |
214 | slog (L_ERR, _("can't bind tcpv4 on %s: %s"), (const char *)si, strerror (errno)); |
216 | slog (L_ERR, _("can't bind tcpv4 on %s: %s"), (const char *)si, strerror (errno)); |
215 | exit (1); |
217 | exit (EXIT_FAILURE); |
216 | } |
218 | } |
217 | |
219 | |
218 | if (listen (tcpv4_fd, 5)) |
220 | if (listen (tcpv4_fd, 5)) |
219 | { |
221 | { |
220 | slog (L_ERR, _("can't listen tcpv4 on %s: %s"), (const char *)si, strerror (errno)); |
222 | slog (L_ERR, _("can't listen tcpv4 on %s: %s"), (const char *)si, strerror (errno)); |
221 | exit (1); |
223 | exit (EXIT_FAILURE); |
222 | } |
224 | } |
223 | |
225 | |
224 | tcpv4_ev_watcher.start (tcpv4_fd, EVENT_READ); |
226 | tcpv4_ev_watcher.start (tcpv4_fd, EVENT_READ); |
|
|
227 | } |
|
|
228 | #endif |
|
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229 | |
|
|
230 | #if ENABLE_DNS |
|
|
231 | if (THISNODE->protocols & PROT_DNSv4) |
|
|
232 | { |
|
|
233 | dnsv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP); |
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234 | |
|
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235 | if (dnsv4_fd < 0) |
|
|
236 | return -1; |
|
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237 | |
|
|
238 | // standard daemon practise... |
|
|
239 | { |
|
|
240 | int oval = 1; |
|
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241 | setsockopt (tcpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval); |
|
|
242 | } |
|
|
243 | |
|
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244 | sockinfo si (THISNODE, PROT_DNSv4); |
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245 | |
|
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246 | if (bind (dnsv4_fd, si.sav4 (), si.salenv4 ())) |
|
|
247 | { |
|
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248 | slog (L_ERR, _("can't bind dnsv4 on %s: %s"), (const char *)si, strerror (errno)); |
|
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249 | exit (EXIT_FAILURE); |
|
|
250 | } |
|
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251 | |
|
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252 | dnsv4_ev_watcher.start (dnsv4_fd, EVENT_READ); |
225 | } |
253 | } |
226 | #endif |
254 | #endif |
227 | |
255 | |
228 | tap = new tap_device (); |
256 | tap = new tap_device (); |
229 | if (!tap) //D this, of course, never catches |
257 | if (!tap) //D this, of course, never catches |
230 | { |
258 | { |
231 | slog (L_ERR, _("cannot create network interface '%s'"), conf.ifname); |
259 | slog (L_ERR, _("cannot create network interface '%s'"), conf.ifname); |
232 | exit (1); |
260 | exit (EXIT_FAILURE); |
233 | } |
261 | } |
234 | |
262 | |
235 | run_script (run_script_cb (this, &vpn::script_if_up), true); |
263 | run_script (run_script_cb (this, &vpn::script_if_up), true); |
236 | |
264 | |
237 | tap_ev_watcher.start (tap->fd, EVENT_READ); |
265 | tap_ev_watcher.start (tap->fd, EVENT_READ); |
238 | |
266 | |
239 | reconnect_all (); |
267 | reconnect_all (); |
240 | |
268 | |
241 | return 0; |
269 | return 0; |
242 | } |
|
|
243 | |
|
|
244 | // send a vpn packet out to other hosts |
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|
245 | bool |
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|
246 | vpn::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
|
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247 | { |
|
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248 | switch (si.prot) |
|
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249 | { |
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250 | case PROT_IPv4: |
|
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251 | return send_ipv4_packet (pkt, si, tos); |
|
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252 | |
|
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253 | case PROT_UDPv4: |
|
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254 | return send_udpv4_packet (pkt, si, tos); |
|
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255 | |
|
|
256 | #if ENABLE_TCP |
|
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257 | case PROT_TCPv4: |
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258 | return send_tcpv4_packet (pkt, si, tos); |
|
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259 | #endif |
|
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260 | |
|
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261 | #if ENABLE_ICMP |
|
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262 | case PROT_ICMPv4: |
|
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263 | return send_icmpv4_packet (pkt, si, tos); |
|
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264 | #endif |
|
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265 | |
|
|
266 | default: |
|
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267 | slog (L_CRIT, _("%s: FATAL: trying to send packet with unsupported protocol"), (const char *)si); |
|
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268 | return false; |
|
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269 | } |
|
|
270 | } |
270 | } |
271 | |
271 | |
272 | bool |
272 | bool |
273 | vpn::send_ipv4_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
273 | vpn::send_ipv4_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
274 | { |
274 | { |
… | |
… | |
430 | else |
430 | else |
431 | { |
431 | { |
432 | slog (L_ERR, |
432 | slog (L_ERR, |
433 | _("FATAL: unknown revents %08x in socket, terminating\n"), |
433 | _("FATAL: unknown revents %08x in socket, terminating\n"), |
434 | revents); |
434 | revents); |
435 | exit (1); |
435 | exit (EXIT_FAILURE); |
436 | } |
436 | } |
437 | } |
437 | } |
438 | |
438 | |
439 | #if ENABLE_ICMP |
439 | #if ENABLE_ICMP |
440 | void |
440 | void |
… | |
… | |
478 | else |
478 | else |
479 | { |
479 | { |
480 | slog (L_ERR, |
480 | slog (L_ERR, |
481 | _("FATAL: unknown revents %08x in socket, terminating\n"), |
481 | _("FATAL: unknown revents %08x in socket, terminating\n"), |
482 | revents); |
482 | revents); |
483 | exit (1); |
483 | exit (EXIT_FAILURE); |
484 | } |
484 | } |
485 | } |
485 | } |
486 | #endif |
486 | #endif |
487 | |
487 | |
488 | void |
488 | void |
… | |
… | |
516 | else |
516 | else |
517 | { |
517 | { |
518 | slog (L_ERR, |
518 | slog (L_ERR, |
519 | _("FATAL: unknown revents %08x in socket, terminating\n"), |
519 | _("FATAL: unknown revents %08x in socket, terminating\n"), |
520 | revents); |
520 | revents); |
521 | exit (1); |
521 | exit (EXIT_FAILURE); |
522 | } |
522 | } |
523 | } |
523 | } |
524 | |
524 | |
525 | void |
525 | void |
526 | vpn::tap_ev (io_watcher &w, short revents) |
526 | vpn::tap_ev (io_watcher &w, short revents) |
… | |
… | |
541 | int src = mac2id (pkt->src); |
541 | int src = mac2id (pkt->src); |
542 | |
542 | |
543 | if (src != THISNODE->id) |
543 | if (src != THISNODE->id) |
544 | { |
544 | { |
545 | slog (L_ERR, _("FATAL: tap packet not originating on current node received, exiting.")); |
545 | slog (L_ERR, _("FATAL: tap packet not originating on current node received, exiting.")); |
546 | exit (1); |
546 | exit (EXIT_FAILURE); |
547 | } |
547 | } |
548 | |
548 | |
549 | if (dst == THISNODE->id) |
549 | if (dst == THISNODE->id) |
550 | { |
550 | { |
551 | slog (L_ERR, _("FATAL: tap packet destined for current node received, exiting.")); |
551 | slog (L_ERR, _("FATAL: tap packet destined for current node received, exiting.")); |
552 | exit (1); |
552 | exit (EXIT_FAILURE); |
553 | } |
553 | } |
554 | |
554 | |
555 | if (dst > conns.size ()) |
555 | if (dst > conns.size ()) |
556 | slog (L_ERR, _("tap packet for unknown node %d received, ignoring."), dst); |
556 | slog (L_ERR, _("tap packet for unknown node %d received, ignoring."), dst); |
557 | else |
557 | else |
… | |
… | |
572 | if (events & EVENT_SHUTDOWN) |
572 | if (events & EVENT_SHUTDOWN) |
573 | { |
573 | { |
574 | slog (L_INFO, _("preparing shutdown...")); |
574 | slog (L_INFO, _("preparing shutdown...")); |
575 | |
575 | |
576 | shutdown_all (); |
576 | shutdown_all (); |
577 | remove_pid (pidfilename); |
577 | remove_pid (conf.pidfilename); |
578 | slog (L_INFO, _("terminating")); |
578 | slog (L_INFO, _("terminating")); |
579 | exit (0); |
579 | exit (EXIT_SUCCESS); |
580 | } |
580 | } |
581 | |
581 | |
582 | if (events & EVENT_RECONNECT) |
582 | if (events & EVENT_RECONNECT) |
583 | { |
583 | { |
584 | slog (L_INFO, _("forced reconnect")); |
584 | slog (L_INFO, _("forced reconnect")); |
… | |
… | |
608 | connection_init (); |
608 | connection_init (); |
609 | |
609 | |
610 | for (configuration::node_vector::iterator i = conf.nodes.begin (); |
610 | for (configuration::node_vector::iterator i = conf.nodes.begin (); |
611 | i != conf.nodes.end (); ++i) |
611 | i != conf.nodes.end (); ++i) |
612 | { |
612 | { |
613 | connection *conn = new connection (this); |
613 | connection *conn = new connection (this, *i); |
614 | |
|
|
615 | conn->conf = *i; |
|
|
616 | conns.push_back (conn); |
614 | conns.push_back (conn); |
617 | |
|
|
618 | conn->establish_connection (); |
615 | conn->establish_connection (); |
619 | } |
616 | } |
620 | } |
617 | } |
621 | |
618 | |
622 | connection *vpn::find_router () |
619 | connection *vpn::find_router () |
… | |
… | |
685 | , tcpv4_ev_watcher (this, &vpn::tcpv4_ev) |
682 | , tcpv4_ev_watcher (this, &vpn::tcpv4_ev) |
686 | #endif |
683 | #endif |
687 | #if ENABLE_ICMP |
684 | #if ENABLE_ICMP |
688 | , icmpv4_ev_watcher(this, &vpn::icmpv4_ev) |
685 | , icmpv4_ev_watcher(this, &vpn::icmpv4_ev) |
689 | #endif |
686 | #endif |
|
|
687 | #if ENABLE_DNS |
|
|
688 | , dnsv4_ev_watcher (this, &vpn::dnsv4_ev) |
|
|
689 | #endif |
690 | , tap_ev_watcher (this, &vpn::tap_ev) |
690 | , tap_ev_watcher (this, &vpn::tap_ev) |
691 | { |
691 | { |
692 | } |
692 | } |
693 | |
693 | |
694 | vpn::~vpn () |
694 | vpn::~vpn () |