| 1 |
/* |
| 2 |
vpn.C -- handle the protocol, encryption, handshaking etc. |
| 3 |
Copyright (C) 2003-2005 Marc Lehmann <gvpe@schmorp.de> |
| 4 |
|
| 5 |
This file is part of GVPE. |
| 6 |
|
| 7 |
GVPE is free software; you can redistribute it and/or modify |
| 8 |
it under the terms of the GNU General Public License as published by |
| 9 |
the Free Software Foundation; either version 2 of the License, or |
| 10 |
(at your option) any later version. |
| 11 |
|
| 12 |
This program is distributed in the hope that it will be useful, |
| 13 |
but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 14 |
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 15 |
GNU General Public License for more details. |
| 16 |
|
| 17 |
You should have received a copy of the GNU General Public License |
| 18 |
along with gvpe; if not, write to the Free Software |
| 19 |
Foundation, Inc. 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
| 20 |
*/ |
| 21 |
|
| 22 |
#include "config.h" |
| 23 |
|
| 24 |
#include <list> |
| 25 |
|
| 26 |
#include <cstdio> |
| 27 |
#include <cstring> |
| 28 |
#include <cstdlib> |
| 29 |
|
| 30 |
#include <sys/types.h> |
| 31 |
#include <sys/socket.h> |
| 32 |
#include <sys/wait.h> |
| 33 |
#include <errno.h> |
| 34 |
#include <time.h> |
| 35 |
#include <unistd.h> |
| 36 |
#include <fcntl.h> |
| 37 |
#include <sys/socket.h> |
| 38 |
|
| 39 |
#include "netcompat.h" |
| 40 |
|
| 41 |
#include "pidfile.h" |
| 42 |
|
| 43 |
#include "connection.h" |
| 44 |
#include "util.h" |
| 45 |
#include "vpn.h" |
| 46 |
|
| 47 |
vpn network; // THE vpn (bad design...) |
| 48 |
|
| 49 |
///////////////////////////////////////////////////////////////////////////// |
| 50 |
|
| 51 |
static void inline |
| 52 |
set_tos (int fd, int &tos_prev, int tos) |
| 53 |
{ |
| 54 |
#if defined(SOL_IP) && defined(IP_TOS) |
| 55 |
if (tos_prev == tos) |
| 56 |
return; |
| 57 |
|
| 58 |
tos_prev = tos; |
| 59 |
setsockopt (fd, SOL_IP, IP_TOS, &tos, sizeof tos); |
| 60 |
#endif |
| 61 |
} |
| 62 |
|
| 63 |
void |
| 64 |
vpn::script_init_env () |
| 65 |
{ |
| 66 |
// the tunnel device mtu should be the physical mtu - overhead |
| 67 |
// the tricky part is rounding to the cipher key blocksize |
| 68 |
int mtu = conf.mtu - ETH_OVERHEAD - VPE_OVERHEAD - MAX_OVERHEAD; |
| 69 |
mtu += ETH_OVERHEAD - 6 - 6; // now we have the data portion |
| 70 |
mtu -= mtu % EVP_CIPHER_block_size (CIPHER); // round |
| 71 |
mtu -= ETH_OVERHEAD - 6 - 6; // and get interface mtu again |
| 72 |
|
| 73 |
char *env; |
| 74 |
asprintf (&env, "CONFBASE=%s", confbase); putenv (env); |
| 75 |
asprintf (&env, "IFNAME=%s", tap->interface ()); putenv (env); |
| 76 |
asprintf (&env, "IFTYPE=%s", IFTYPE); putenv (env); |
| 77 |
asprintf (&env, "IFSUBTYPE=%s", IFSUBTYPE); putenv (env); |
| 78 |
asprintf (&env, "MTU=%d", mtu); putenv (env); |
| 79 |
asprintf (&env, "NODES=%d", conns.size ()); putenv (env); |
| 80 |
asprintf (&env, "NODEID=%d", THISNODE->id); putenv (env); |
| 81 |
|
| 82 |
conns [THISNODE->id - 1]->script_init_env (""); |
| 83 |
|
| 84 |
for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c) |
| 85 |
{ |
| 86 |
char ext[16]; |
| 87 |
snprintf (ext, 16, "_%d", (*c)->conf->id); |
| 88 |
(*c)->script_init_env (ext); |
| 89 |
} |
| 90 |
} |
| 91 |
|
| 92 |
const char *vpn::script_if_init () |
| 93 |
{ |
| 94 |
script_init_env (); |
| 95 |
|
| 96 |
return tap->if_up (); |
| 97 |
} |
| 98 |
|
| 99 |
const char *vpn::script_if_up () |
| 100 |
{ |
| 101 |
script_init_env (); |
| 102 |
|
| 103 |
char *filename; |
| 104 |
asprintf (&filename, |
| 105 |
"%s/%s", |
| 106 |
confbase, |
| 107 |
::conf.script_if_up ? ::conf.script_if_up : "if-up"); |
| 108 |
|
| 109 |
return filename; |
| 110 |
} |
| 111 |
|
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int |
| 113 |
vpn::setup () |
| 114 |
{ |
| 115 |
ipv4_tos = -1; |
| 116 |
ipv4_fd = -1; |
| 117 |
|
| 118 |
if (THISNODE->protocols & PROT_IPv4 && ::conf.ip_proto) |
| 119 |
{ |
| 120 |
ipv4_fd = socket (PF_INET, SOCK_RAW, ::conf.ip_proto); |
| 121 |
|
| 122 |
if (ipv4_fd < 0) |
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return -1; |
| 124 |
|
| 125 |
fcntl (ipv4_fd, F_SETFL, O_NONBLOCK); |
| 126 |
fcntl (ipv4_fd, F_SETFD, FD_CLOEXEC); |
| 127 |
|
| 128 |
#if defined(SOL_IP) && defined(IP_MTU_DISCOVER) |
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// this I really consider a linux bug. I am neither connected |
| 130 |
// nor do I fragment myself. Linux still sets DF and doesn't |
| 131 |
// fragment for me sometimes. |
| 132 |
{ |
| 133 |
int oval = IP_PMTUDISC_DONT; |
| 134 |
setsockopt (ipv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval); |
| 135 |
} |
| 136 |
#endif |
| 137 |
|
| 138 |
sockinfo si (THISNODE, PROT_IPv4); |
| 139 |
|
| 140 |
if (bind (ipv4_fd, si.sav4 (), si.salenv4 ())) |
| 141 |
{ |
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slog (L_ERR, _("can't bind ipv4 socket on %s: %s"), (const char *)si, strerror (errno)); |
| 143 |
exit (EXIT_FAILURE); |
| 144 |
} |
| 145 |
|
| 146 |
ipv4_ev_watcher.start (ipv4_fd, EV_READ); |
| 147 |
} |
| 148 |
|
| 149 |
udpv4_tos = -1; |
| 150 |
udpv4_fd = -1; |
| 151 |
|
| 152 |
if (THISNODE->protocols & PROT_UDPv4 && THISNODE->udp_port) |
| 153 |
{ |
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udpv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP); |
| 155 |
|
| 156 |
if (udpv4_fd < 0) |
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return -1; |
| 158 |
|
| 159 |
fcntl (udpv4_fd, F_SETFL, O_NONBLOCK); |
| 160 |
fcntl (udpv4_fd, F_SETFD, FD_CLOEXEC); |
| 161 |
|
| 162 |
// standard daemon practise... |
| 163 |
{ |
| 164 |
int oval = 1; |
| 165 |
setsockopt (udpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval); |
| 166 |
} |
| 167 |
|
| 168 |
#if defined(SOL_IP) && defined(IP_MTU_DISCOVER) |
| 169 |
// this I really consider a linux bug. I am neither connected |
| 170 |
// nor do I fragment myself. Linux still sets DF and doesn't |
| 171 |
// fragment for me sometimes. |
| 172 |
{ |
| 173 |
int oval = IP_PMTUDISC_DONT; |
| 174 |
setsockopt (udpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval); |
| 175 |
} |
| 176 |
#endif |
| 177 |
|
| 178 |
sockinfo si (THISNODE, PROT_UDPv4); |
| 179 |
|
| 180 |
if (bind (udpv4_fd, si.sav4 (), si.salenv4 ())) |
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{ |
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slog (L_ERR, _("can't bind udpv4 on %s: %s"), (const char *)si, strerror (errno)); |
| 183 |
exit (EXIT_FAILURE); |
| 184 |
} |
| 185 |
|
| 186 |
udpv4_ev_watcher.start (udpv4_fd, EV_READ); |
| 187 |
} |
| 188 |
|
| 189 |
icmpv4_tos = -1; |
| 190 |
icmpv4_fd = -1; |
| 191 |
|
| 192 |
#if ENABLE_ICMP |
| 193 |
if (THISNODE->protocols & PROT_ICMPv4) |
| 194 |
{ |
| 195 |
icmpv4_fd = socket (PF_INET, SOCK_RAW, IPPROTO_ICMP); |
| 196 |
|
| 197 |
if (icmpv4_fd < 0) |
| 198 |
return -1; |
| 199 |
|
| 200 |
fcntl (icmpv4_fd, F_SETFL, O_NONBLOCK); |
| 201 |
fcntl (icmpv4_fd, F_SETFD, FD_CLOEXEC); |
| 202 |
|
| 203 |
#ifdef ICMP_FILTER |
| 204 |
{ |
| 205 |
icmp_filter oval; |
| 206 |
oval.data = 0xffffffff; |
| 207 |
if (::conf.icmp_type < 32) |
| 208 |
oval.data &= ~(1 << ::conf.icmp_type); |
| 209 |
|
| 210 |
setsockopt (icmpv4_fd, SOL_RAW, ICMP_FILTER, &oval, sizeof oval); |
| 211 |
} |
| 212 |
#endif |
| 213 |
|
| 214 |
#if defined(SOL_IP) && defined(IP_MTU_DISCOVER) |
| 215 |
// this I really consider a linux bug. I am neither connected |
| 216 |
// nor do I fragment myself. Linux still sets DF and doesn't |
| 217 |
// fragment for me sometimes. |
| 218 |
{ |
| 219 |
int oval = IP_PMTUDISC_DONT; |
| 220 |
setsockopt (icmpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval); |
| 221 |
} |
| 222 |
#endif |
| 223 |
|
| 224 |
sockinfo si (THISNODE, PROT_ICMPv4); |
| 225 |
|
| 226 |
if (bind (icmpv4_fd, si.sav4 (), si.salenv4 ())) |
| 227 |
{ |
| 228 |
slog (L_ERR, _("can't bind icmpv4 on %s: %s"), (const char *)si, strerror (errno)); |
| 229 |
exit (EXIT_FAILURE); |
| 230 |
} |
| 231 |
|
| 232 |
icmpv4_ev_watcher.start (icmpv4_fd, EV_READ); |
| 233 |
} |
| 234 |
#endif |
| 235 |
|
| 236 |
tcpv4_fd = -1; |
| 237 |
|
| 238 |
#if ENABLE_TCP |
| 239 |
if (THISNODE->protocols & PROT_TCPv4 && THISNODE->tcp_port) |
| 240 |
{ |
| 241 |
tcpv4_fd = socket (PF_INET, SOCK_STREAM, IPPROTO_TCP); |
| 242 |
|
| 243 |
if (tcpv4_fd < 0) |
| 244 |
return -1; |
| 245 |
|
| 246 |
fcntl (tcpv4_fd, F_SETFL, O_NONBLOCK); |
| 247 |
fcntl (tcpv4_fd, F_SETFD, FD_CLOEXEC); |
| 248 |
|
| 249 |
// standard daemon practise... |
| 250 |
{ |
| 251 |
int oval = 1; |
| 252 |
setsockopt (tcpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval); |
| 253 |
} |
| 254 |
|
| 255 |
sockinfo si (THISNODE, PROT_TCPv4); |
| 256 |
|
| 257 |
if (bind (tcpv4_fd, si.sav4 (), si.salenv4 ())) |
| 258 |
{ |
| 259 |
slog (L_ERR, _("can't bind tcpv4 on %s: %s"), (const char *)si, strerror (errno)); |
| 260 |
exit (EXIT_FAILURE); |
| 261 |
} |
| 262 |
|
| 263 |
if (listen (tcpv4_fd, 5)) |
| 264 |
{ |
| 265 |
slog (L_ERR, _("can't listen tcpv4 on %s: %s"), (const char *)si, strerror (errno)); |
| 266 |
exit (EXIT_FAILURE); |
| 267 |
} |
| 268 |
|
| 269 |
tcpv4_ev_watcher.start (tcpv4_fd, EV_READ); |
| 270 |
} |
| 271 |
#endif |
| 272 |
|
| 273 |
dnsv4_tos = -1; |
| 274 |
dnsv4_fd = -1; |
| 275 |
|
| 276 |
#if ENABLE_DNS |
| 277 |
if (THISNODE->protocols & PROT_DNSv4) |
| 278 |
{ |
| 279 |
dns_forwarder.set (::conf.dns_forw_host, ::conf.dns_forw_port, PROT_DNSv4); |
| 280 |
|
| 281 |
dnsv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP); |
| 282 |
|
| 283 |
if (dnsv4_fd < 0) |
| 284 |
return -1; |
| 285 |
|
| 286 |
fcntl (dnsv4_fd, F_SETFL, O_NONBLOCK); |
| 287 |
fcntl (dnsv4_fd, F_SETFD, FD_CLOEXEC); |
| 288 |
|
| 289 |
# if defined(SOL_IP) && defined(IP_MTU_DISCOVER) |
| 290 |
// this I really consider a linux bug. I am neither connected |
| 291 |
// nor do I fragment myself. Linux still sets DF and doesn't |
| 292 |
// fragment for me sometimes. |
| 293 |
{ |
| 294 |
int oval = IP_PMTUDISC_DONT; |
| 295 |
setsockopt (dnsv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval); |
| 296 |
} |
| 297 |
# endif |
| 298 |
|
| 299 |
// standard daemon practise... |
| 300 |
{ |
| 301 |
int oval = 1; |
| 302 |
setsockopt (dnsv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval); |
| 303 |
} |
| 304 |
|
| 305 |
sockinfo si (THISNODE->dns_hostname, |
| 306 |
THISNODE->dns_hostname ? THISNODE->dns_port : 0, |
| 307 |
PROT_DNSv4); |
| 308 |
|
| 309 |
if (bind (dnsv4_fd, si.sav4 (), si.salenv4 ())) |
| 310 |
{ |
| 311 |
slog (L_ERR, _("can't bind dnsv4 on %s: %s"), (const char *)si, strerror (errno)); |
| 312 |
exit (EXIT_FAILURE); |
| 313 |
} |
| 314 |
|
| 315 |
dnsv4_ev_watcher.start (dnsv4_fd, EV_READ); |
| 316 |
} |
| 317 |
#endif |
| 318 |
|
| 319 |
///////////////////////////////////////////////////////////////////////////// |
| 320 |
|
| 321 |
reconnect_all (); |
| 322 |
|
| 323 |
///////////////////////////////////////////////////////////////////////////// |
| 324 |
|
| 325 |
tap = new tap_device (); |
| 326 |
if (!tap) //D this, of course, never catches |
| 327 |
{ |
| 328 |
slog (L_ERR, _("cannot create network interface '%s'"), conf.ifname); |
| 329 |
exit (EXIT_FAILURE); |
| 330 |
} |
| 331 |
|
| 332 |
fcntl (tap->fd, F_SETFD, FD_CLOEXEC); |
| 333 |
|
| 334 |
if (tap->if_up () && |
| 335 |
!run_script (run_script_cb (this, &vpn::script_if_init), true)) |
| 336 |
{ |
| 337 |
slog (L_ERR, _("interface initialization command '%s' failed, exiting."), |
| 338 |
tap->if_up ()); |
| 339 |
exit (EXIT_FAILURE); |
| 340 |
} |
| 341 |
|
| 342 |
if (!run_script (run_script_cb (this, &vpn::script_if_up), true)) |
| 343 |
{ |
| 344 |
slog (L_ERR, _("if-up command execution failed, exiting.")); |
| 345 |
exit (EXIT_FAILURE); |
| 346 |
} |
| 347 |
|
| 348 |
tap_ev_watcher.start (tap->fd, EV_READ); |
| 349 |
|
| 350 |
return 0; |
| 351 |
} |
| 352 |
|
| 353 |
bool |
| 354 |
vpn::send_ipv4_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
| 355 |
{ |
| 356 |
set_tos (ipv4_fd, ipv4_tos, tos); |
| 357 |
sendto (ipv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ()); |
| 358 |
|
| 359 |
return true; |
| 360 |
} |
| 361 |
|
| 362 |
static u16 |
| 363 |
ipv4_checksum (u16 *data, unsigned int len) |
| 364 |
{ |
| 365 |
// use 32 bit accumulator and fold back carry bits at the end |
| 366 |
u32 sum = 0; |
| 367 |
|
| 368 |
while (len > 1) |
| 369 |
{ |
| 370 |
sum += *data++; |
| 371 |
len -= 2; |
| 372 |
} |
| 373 |
|
| 374 |
// odd byte left? |
| 375 |
if (len) |
| 376 |
sum += *(u8 *)data; |
| 377 |
|
| 378 |
// add back carry bits |
| 379 |
sum = (sum >> 16) + (sum & 0xffff); // lo += hi |
| 380 |
sum += (sum >> 16); // carry |
| 381 |
|
| 382 |
return ~sum; |
| 383 |
} |
| 384 |
|
| 385 |
#if ENABLE_ICMP |
| 386 |
bool |
| 387 |
vpn::send_icmpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
| 388 |
{ |
| 389 |
pkt->unshift_hdr (4); |
| 390 |
|
| 391 |
icmp_header *hdr = (icmp_header *)&((*pkt)[0]); |
| 392 |
hdr->type = ::conf.icmp_type; |
| 393 |
hdr->code = 255; |
| 394 |
hdr->checksum = 0; |
| 395 |
hdr->checksum = ipv4_checksum ((u16 *)hdr, pkt->len); |
| 396 |
|
| 397 |
set_tos (icmpv4_fd, icmpv4_tos, tos); |
| 398 |
sendto (icmpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ()); |
| 399 |
|
| 400 |
return true; |
| 401 |
} |
| 402 |
#endif |
| 403 |
|
| 404 |
bool |
| 405 |
vpn::send_udpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
| 406 |
{ |
| 407 |
set_tos (udpv4_fd, udpv4_tos, tos); |
| 408 |
sendto (udpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ()); |
| 409 |
|
| 410 |
return true; |
| 411 |
} |
| 412 |
|
| 413 |
void |
| 414 |
vpn::inject_data_packet (tap_packet *pkt, int dst) |
| 415 |
{ |
| 416 |
if (dst) |
| 417 |
{ |
| 418 |
// unicast |
| 419 |
if (dst != THISNODE->id) |
| 420 |
conns[dst - 1]->inject_data_packet (pkt); |
| 421 |
} |
| 422 |
else |
| 423 |
{ |
| 424 |
// broadcast, this is ugly, but due to the security policy |
| 425 |
// we have to connect to all hosts... |
| 426 |
for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c) |
| 427 |
if ((*c)->conf != THISNODE) |
| 428 |
(*c)->inject_data_packet (pkt, true); |
| 429 |
} |
| 430 |
} |
| 431 |
|
| 432 |
void |
| 433 |
vpn::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi) |
| 434 |
{ |
| 435 |
unsigned int src = pkt->src (); |
| 436 |
unsigned int dst = pkt->dst (); |
| 437 |
|
| 438 |
slog (L_NOISE, _("<<?/%s received possible vpn packet type %d from %d to %d, length %d"), |
| 439 |
(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst (), pkt->len); |
| 440 |
|
| 441 |
if (src == 0 || src > conns.size () |
| 442 |
|| dst > conns.size () |
| 443 |
|| pkt->typ () >= vpn_packet::PT_MAX) |
| 444 |
slog (L_WARN, _("(%s): received corrupted packet type %d (src %d, dst %d)"), |
| 445 |
(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ()); |
| 446 |
else if (dst > conns.size ()) |
| 447 |
slog (L_WARN, _("(%s): received corrupted packet type %d (src %d, dst %d)"), |
| 448 |
(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ()); |
| 449 |
else |
| 450 |
{ |
| 451 |
connection *c = conns[src - 1]; |
| 452 |
|
| 453 |
if (dst == 0) |
| 454 |
slog (L_WARN, _("%s(%s): received broadcast (protocol violation)"), |
| 455 |
c->conf->nodename, (const char *)rsi); |
| 456 |
else if (dst != THISNODE->id) |
| 457 |
{ |
| 458 |
if (THISNODE->routerprio) |
| 459 |
// the tos setting gets lost here. who cares. |
| 460 |
conns[dst - 1]->inject_vpn_packet (pkt); |
| 461 |
else |
| 462 |
slog (L_WARN, |
| 463 |
_("%s(%s): forwarding request (=> %s), but we are no router"), |
| 464 |
c->conf->nodename, (const char *)rsi, |
| 465 |
conns[dst - 1]->conf->nodename); |
| 466 |
} |
| 467 |
else |
| 468 |
c->recv_vpn_packet (pkt, rsi); |
| 469 |
} |
| 470 |
} |
| 471 |
|
| 472 |
bool |
| 473 |
vpn::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
| 474 |
{ |
| 475 |
switch (si.prot) |
| 476 |
{ |
| 477 |
case PROT_IPv4: |
| 478 |
return send_ipv4_packet (pkt, si, tos); |
| 479 |
|
| 480 |
case PROT_UDPv4: |
| 481 |
return send_udpv4_packet (pkt, si, tos); |
| 482 |
|
| 483 |
#if ENABLE_TCP |
| 484 |
case PROT_TCPv4: |
| 485 |
return send_tcpv4_packet (pkt, si, tos); |
| 486 |
#endif |
| 487 |
#if ENABLE_ICMP |
| 488 |
case PROT_ICMPv4: |
| 489 |
return send_icmpv4_packet (pkt, si, tos); |
| 490 |
#endif |
| 491 |
#if ENABLE_DNS |
| 492 |
case PROT_DNSv4: |
| 493 |
return send_dnsv4_packet (pkt, si, tos); |
| 494 |
#endif |
| 495 |
default: |
| 496 |
slog (L_CRIT, _("%s: FATAL: trying to send packet with unsupported protocol"), (const char *)si); |
| 497 |
} |
| 498 |
|
| 499 |
return false; |
| 500 |
} |
| 501 |
|
| 502 |
void |
| 503 |
vpn::ipv4_ev (ev::io &w, int revents) |
| 504 |
{ |
| 505 |
if (revents & EV_READ) |
| 506 |
{ |
| 507 |
vpn_packet *pkt = new vpn_packet; |
| 508 |
struct sockaddr_in sa; |
| 509 |
socklen_t sa_len = sizeof (sa); |
| 510 |
int len; |
| 511 |
|
| 512 |
len = recvfrom (w.fd, &((*pkt)[0]), MAXSIZE, 0, (sockaddr *)&sa, &sa_len); |
| 513 |
|
| 514 |
sockinfo si(sa, PROT_IPv4); |
| 515 |
|
| 516 |
if (len > 0) |
| 517 |
{ |
| 518 |
pkt->len = len; |
| 519 |
|
| 520 |
// raw sockets deliver the ipv4 header, but don't expect it on sends |
| 521 |
pkt->skip_hdr (IP_OVERHEAD); |
| 522 |
|
| 523 |
recv_vpn_packet (pkt, si); |
| 524 |
} |
| 525 |
else |
| 526 |
{ |
| 527 |
// probably ECONNRESET or somesuch |
| 528 |
slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno)); |
| 529 |
} |
| 530 |
|
| 531 |
delete pkt; |
| 532 |
} |
| 533 |
else |
| 534 |
{ |
| 535 |
slog (L_ERR, |
| 536 |
_("FATAL: unknown revents %08x in socket, terminating\n"), |
| 537 |
revents); |
| 538 |
exit (EXIT_FAILURE); |
| 539 |
} |
| 540 |
} |
| 541 |
|
| 542 |
#if ENABLE_ICMP |
| 543 |
void |
| 544 |
vpn::icmpv4_ev (ev::io &w, int revents) |
| 545 |
{ |
| 546 |
if (revents & EV_READ) |
| 547 |
{ |
| 548 |
vpn_packet *pkt = new vpn_packet; |
| 549 |
struct sockaddr_in sa; |
| 550 |
socklen_t sa_len = sizeof (sa); |
| 551 |
int len; |
| 552 |
|
| 553 |
len = recvfrom (w.fd, &((*pkt)[0]), MAXSIZE, 0, (sockaddr *)&sa, &sa_len); |
| 554 |
|
| 555 |
sockinfo si(sa, PROT_ICMPv4); |
| 556 |
|
| 557 |
if (len > 0) |
| 558 |
{ |
| 559 |
pkt->len = len; |
| 560 |
|
| 561 |
icmp_header *hdr = (icmp_header *)&((*pkt)[IP_OVERHEAD]); |
| 562 |
|
| 563 |
if (hdr->type == ::conf.icmp_type |
| 564 |
&& hdr->code == 255) |
| 565 |
{ |
| 566 |
// raw sockets deliver the ipv4, but don't expect it on sends |
| 567 |
// this is slow, but... |
| 568 |
pkt->skip_hdr (ICMP_OVERHEAD); |
| 569 |
|
| 570 |
recv_vpn_packet (pkt, si); |
| 571 |
} |
| 572 |
} |
| 573 |
else |
| 574 |
{ |
| 575 |
// probably ECONNRESET or somesuch |
| 576 |
slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno)); |
| 577 |
} |
| 578 |
|
| 579 |
delete pkt; |
| 580 |
} |
| 581 |
else |
| 582 |
{ |
| 583 |
slog (L_ERR, |
| 584 |
_("FATAL: unknown revents %08x in socket, terminating\n"), |
| 585 |
revents); |
| 586 |
exit (EXIT_FAILURE); |
| 587 |
} |
| 588 |
} |
| 589 |
#endif |
| 590 |
|
| 591 |
void |
| 592 |
vpn::udpv4_ev (ev::io &w, int revents) |
| 593 |
{ |
| 594 |
if (revents & EV_READ) |
| 595 |
{ |
| 596 |
vpn_packet *pkt = new vpn_packet; |
| 597 |
struct sockaddr_in sa; |
| 598 |
socklen_t sa_len = sizeof (sa); |
| 599 |
int len; |
| 600 |
|
| 601 |
len = recvfrom (w.fd, &((*pkt)[0]), MAXSIZE, 0, (sockaddr *)&sa, &sa_len); |
| 602 |
|
| 603 |
sockinfo si(sa, PROT_UDPv4); |
| 604 |
|
| 605 |
if (len > 0) |
| 606 |
{ |
| 607 |
pkt->len = len; |
| 608 |
|
| 609 |
recv_vpn_packet (pkt, si); |
| 610 |
} |
| 611 |
else |
| 612 |
{ |
| 613 |
// probably ECONNRESET or somesuch |
| 614 |
slog (L_DEBUG, _("%s: fd %d, %s"), (const char *)si, w.fd, strerror (errno)); |
| 615 |
} |
| 616 |
|
| 617 |
delete pkt; |
| 618 |
} |
| 619 |
else |
| 620 |
{ |
| 621 |
slog (L_ERR, |
| 622 |
_("FATAL: unknown revents %08x in socket, terminating\n"), |
| 623 |
revents); |
| 624 |
exit (EXIT_FAILURE); |
| 625 |
} |
| 626 |
} |
| 627 |
|
| 628 |
void |
| 629 |
vpn::tap_ev (ev::io &w, int revents) |
| 630 |
{ |
| 631 |
if (revents & EV_READ) |
| 632 |
{ |
| 633 |
/* process data */ |
| 634 |
tap_packet *pkt; |
| 635 |
|
| 636 |
pkt = tap->recv (); |
| 637 |
|
| 638 |
if (!pkt) |
| 639 |
return; |
| 640 |
|
| 641 |
if (pkt->len > 14) |
| 642 |
{ |
| 643 |
int dst = mac2id (pkt->dst); |
| 644 |
int src = mac2id (pkt->src); |
| 645 |
|
| 646 |
if (src != THISNODE->id) |
| 647 |
{ |
| 648 |
slog (L_ERR, _("FATAL: tap packet not originating on current node received (if-up script not working properly?), exiting.")); |
| 649 |
exit (EXIT_FAILURE); |
| 650 |
} |
| 651 |
|
| 652 |
if (dst == THISNODE->id) |
| 653 |
{ |
| 654 |
slog (L_ERR, _("FATAL: tap packet destined for current node received, exiting.")); |
| 655 |
exit (EXIT_FAILURE); |
| 656 |
} |
| 657 |
|
| 658 |
if (dst > conns.size ()) |
| 659 |
slog (L_ERR, _("tap packet for unknown node %d received, ignoring."), dst); |
| 660 |
else |
| 661 |
inject_data_packet (pkt, dst); |
| 662 |
} |
| 663 |
|
| 664 |
delete pkt; |
| 665 |
} |
| 666 |
else |
| 667 |
abort (); |
| 668 |
} |
| 669 |
|
| 670 |
void |
| 671 |
vpn::event_cb (ev::timer &w, int) |
| 672 |
{ |
| 673 |
if (events) |
| 674 |
{ |
| 675 |
if (events & EVENT_SHUTDOWN) |
| 676 |
{ |
| 677 |
slog (L_INFO, _("preparing shutdown...")); |
| 678 |
|
| 679 |
shutdown_all (); |
| 680 |
remove_pid (conf.pidfilename); |
| 681 |
slog (L_INFO, _("terminating")); |
| 682 |
exit (EXIT_SUCCESS); |
| 683 |
} |
| 684 |
|
| 685 |
if (events & EVENT_RECONNECT) |
| 686 |
{ |
| 687 |
slog (L_INFO, _("forced reconnect")); |
| 688 |
|
| 689 |
reconnect_all (); |
| 690 |
} |
| 691 |
|
| 692 |
events = 0; |
| 693 |
} |
| 694 |
} |
| 695 |
|
| 696 |
void |
| 697 |
vpn::shutdown_all () |
| 698 |
{ |
| 699 |
for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c) |
| 700 |
(*c)->shutdown (); |
| 701 |
} |
| 702 |
|
| 703 |
void |
| 704 |
vpn::reconnect_all () |
| 705 |
{ |
| 706 |
for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c) |
| 707 |
delete *c; |
| 708 |
|
| 709 |
conns.clear (); |
| 710 |
|
| 711 |
connection_init (); |
| 712 |
|
| 713 |
for (configuration::node_vector::iterator i = conf.nodes.begin (); |
| 714 |
i != conf.nodes.end (); ++i) |
| 715 |
{ |
| 716 |
connection *conn = new connection (this, *i); |
| 717 |
conns.push_back (conn); |
| 718 |
conn->establish_connection (); |
| 719 |
} |
| 720 |
} |
| 721 |
|
| 722 |
connection *vpn::find_router () |
| 723 |
{ |
| 724 |
u32 prio = 1; |
| 725 |
connection *router = 0; |
| 726 |
|
| 727 |
for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i) |
| 728 |
{ |
| 729 |
connection *c = *i; |
| 730 |
|
| 731 |
if (c->conf->routerprio > prio |
| 732 |
&& c->connectmode == conf_node::C_ALWAYS // so we don't drop the connection if in use |
| 733 |
&& c->ictx && c->octx |
| 734 |
&& c->conf != THISNODE) // redundant, since ictx==octx==0 always on thisnode |
| 735 |
{ |
| 736 |
prio = c->conf->routerprio; |
| 737 |
router = c; |
| 738 |
} |
| 739 |
} |
| 740 |
|
| 741 |
return router; |
| 742 |
} |
| 743 |
|
| 744 |
void vpn::send_connect_request (int id) |
| 745 |
{ |
| 746 |
connection *c = find_router (); |
| 747 |
|
| 748 |
if (c) |
| 749 |
c->send_connect_request (id); |
| 750 |
else |
| 751 |
// no router found, aggressively connect to all routers |
| 752 |
for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i) |
| 753 |
if ((*i)->conf->routerprio && (*i)->conf != THISNODE) |
| 754 |
(*i)->establish_connection (); |
| 755 |
} |
| 756 |
|
| 757 |
void |
| 758 |
connection::dump_status () |
| 759 |
{ |
| 760 |
slog (L_NOTICE, _("node %s (id %d)"), conf->nodename, conf->id); |
| 761 |
slog (L_NOTICE, _(" connectmode %d (%d) / sockaddr %s / minor %d"), |
| 762 |
connectmode, conf->connectmode, (const char *)si, (int)prot_minor); |
| 763 |
slog (L_NOTICE, _(" ictx/octx %08lx/%08lx / oseqno %d / retry_cnt %d"), |
| 764 |
(long)ictx, (long)octx, (int)oseqno, (int)retry_cnt); |
| 765 |
slog (L_NOTICE, _(" establish_conn %ld / rekey %ld / keepalive %ld"), |
| 766 |
(long)(establish_connection.at), (long)(rekey.at), (long)(keepalive.at)); |
| 767 |
} |
| 768 |
|
| 769 |
void |
| 770 |
vpn::dump_status () |
| 771 |
{ |
| 772 |
slog (L_NOTICE, _("BEGIN status dump (%ld)"), (long)ev_now ()); |
| 773 |
|
| 774 |
for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c) |
| 775 |
(*c)->dump_status (); |
| 776 |
|
| 777 |
slog (L_NOTICE, _("END status dump")); |
| 778 |
} |
| 779 |
|
| 780 |
vpn::vpn (void) |
| 781 |
: event (this, &vpn::event_cb) |
| 782 |
, udpv4_ev_watcher (this, &vpn::udpv4_ev) |
| 783 |
, ipv4_ev_watcher (this, &vpn::ipv4_ev) |
| 784 |
#if ENABLE_TCP |
| 785 |
, tcpv4_ev_watcher (this, &vpn::tcpv4_ev) |
| 786 |
#endif |
| 787 |
#if ENABLE_ICMP |
| 788 |
, icmpv4_ev_watcher(this, &vpn::icmpv4_ev) |
| 789 |
#endif |
| 790 |
#if ENABLE_DNS |
| 791 |
, dnsv4_ev_watcher (this, &vpn::dnsv4_ev) |
| 792 |
#endif |
| 793 |
, tap_ev_watcher (this, &vpn::tap_ev) |
| 794 |
{ |
| 795 |
} |
| 796 |
|
| 797 |
vpn::~vpn () |
| 798 |
{ |
| 799 |
} |
| 800 |
|
