gvpe/src/vpn.C

/*
    vpn.C -- handle the protocol, encryption, handshaking etc.
    Copyright (C) 2003-2005 Marc Lehmann <gvpe@schmorp.de>
 
    This file is part of GVPE.

    GVPE is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation; either version 2 of the License, or
    (at your option) any later version.
 
    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.
 
    You should have received a copy of the GNU General Public License
    along with gvpe; if not, write to the Free Software
    Foundation, Inc. 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
*/

#include "config.h"

#include <list>

#include <cstdio>
#include <cstring>
#include <cstdlib>

#include <sys/types.h>
#include <sys/socket.h>
#include <sys/wait.h>
#include <errno.h>
#include <time.h>
#include <unistd.h>
#include <fcntl.h>
#include <sys/socket.h>

#include "netcompat.h"

#include "pidfile.h"

#include "connection.h"
#include "util.h"
#include "vpn.h"

vpn network; // THE vpn (bad design...)

/////////////////////////////////////////////////////////////////////////////

const char *vpn::script_if_up ()
{
  // the tunnel device mtu should be the physical mtu - overhead
  // the tricky part is rounding to the cipher key blocksize
  int mtu = conf.mtu - ETH_OVERHEAD - VPE_OVERHEAD - MAX_OVERHEAD;
  mtu += ETH_OVERHEAD - 6 - 6; // now we have the data portion
  mtu -= mtu % EVP_CIPHER_block_size (CIPHER); // round
  mtu -= ETH_OVERHEAD - 6 - 6; // and get interface mtu again

  char *env;
  asprintf (&env, "CONFBASE=%s", confbase); putenv (env);
  asprintf (&env, "NODENAME=%s", THISNODE->nodename); putenv (env);
  asprintf (&env, "NODEID=%d", THISNODE->id); putenv (env);
  asprintf (&env, "IFNAME=%s", tap->interface ()); putenv (env);
  asprintf (&env, "IFTYPE=%s", IFTYPE); putenv (env);
  asprintf (&env, "IFSUBTYPE=%s", IFSUBTYPE); putenv (env);
  asprintf (&env, "MTU=%d", mtu); putenv (env);
  asprintf (&env, "MAC=%02x:%02x:%02x:%02x:%02x:%02x",
            0xfe, 0xfd, 0x80, 0x00, THISNODE->id >> 8,
            THISNODE->id & 0xff);
  putenv (env);

  return ::conf.script_if_up ? ::conf.script_if_up : "if-up";
}

int
vpn::setup ()
{
  ipv4_fd = -1;

  if (THISNODE->protocols & PROT_IPv4 && ::conf.ip_proto)
    {
      ipv4_fd = socket (PF_INET, SOCK_RAW, ::conf.ip_proto);

      if (ipv4_fd < 0)
        return -1;

      fcntl (ipv4_fd, F_SETFL, O_NONBLOCK);

#if defined(SOL_IP) && defined(IP_MTU_DISCOVER)
      // this I really consider a linux bug. I am neither connected
      // nor do I fragment myself. Linux still sets DF and doesn't
      // fragment for me sometimes.
      {
        int oval = IP_PMTUDISC_DONT;
        setsockopt (ipv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);
      }
#endif

      sockinfo si (THISNODE, PROT_IPv4);

      if (bind (ipv4_fd, si.sav4 (), si.salenv4 ()))
        {
          slog (L_ERR, _("can't bind ipv4 socket on %s: %s"), (const char *)si, strerror (errno));
          exit (EXIT_FAILURE);
        }

      ipv4_ev_watcher.start (ipv4_fd, EVENT_READ);
    }

  udpv4_fd = -1;

  if (THISNODE->protocols & PROT_UDPv4 && THISNODE->udp_port)
    {
      udpv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP);

      if (udpv4_fd < 0)
        return -1;

      fcntl (udpv4_fd, F_SETFL, O_NONBLOCK);

      // standard daemon practise...
      {
        int oval = 1;
        setsockopt (udpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);
      }

#if defined(SOL_IP) && defined(IP_MTU_DISCOVER)
      // this I really consider a linux bug. I am neither connected
      // nor do I fragment myself. Linux still sets DF and doesn't
      // fragment for me sometimes.
      {
        int oval = IP_PMTUDISC_DONT;
        setsockopt (udpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);
      }
#endif

      sockinfo si (THISNODE, PROT_UDPv4);

      if (bind (udpv4_fd, si.sav4 (), si.salenv4 ()))
        {
          slog (L_ERR, _("can't bind udpv4 on %s: %s"), (const char *)si, strerror (errno));
          exit (EXIT_FAILURE);
        }

      udpv4_ev_watcher.start (udpv4_fd, EVENT_READ);
    }

  icmpv4_fd = -1;

#if ENABLE_ICMP
  if (THISNODE->protocols & PROT_ICMPv4)
    {
      icmpv4_fd = socket (PF_INET, SOCK_RAW, IPPROTO_ICMP);

      if (icmpv4_fd < 0)
        return -1;

      fcntl (icmpv4_fd, F_SETFL, O_NONBLOCK);

#ifdef ICMP_FILTER
      {
        icmp_filter oval;
        oval.data = 0xffffffff;
        if (::conf.icmp_type < 32)
          oval.data &= ~(1 << ::conf.icmp_type);

        setsockopt (icmpv4_fd, SOL_RAW, ICMP_FILTER, &oval, sizeof oval);
      }
#endif

#if defined(SOL_IP) && defined(IP_MTU_DISCOVER)
      // this I really consider a linux bug. I am neither connected
      // nor do I fragment myself. Linux still sets DF and doesn't
      // fragment for me sometimes.
      {
        int oval = IP_PMTUDISC_DONT;
        setsockopt (udpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);
      }
#endif

      sockinfo si (THISNODE, PROT_ICMPv4);

      if (bind (icmpv4_fd, si.sav4 (), si.salenv4 ()))
        {
          slog (L_ERR, _("can't bind icmpv4 on %s: %s"), (const char *)si, strerror (errno));
          exit (EXIT_FAILURE);
        }

      icmpv4_ev_watcher.start (icmpv4_fd, EVENT_READ);
    }
#endif

  tcpv4_fd = -1;

#if ENABLE_TCP
  if (THISNODE->protocols & PROT_TCPv4 && THISNODE->tcp_port)
    {
      tcpv4_fd = socket (PF_INET, SOCK_STREAM, IPPROTO_TCP);

      if (tcpv4_fd < 0)
        return -1;

      fcntl (tcpv4_fd, F_SETFL, O_NONBLOCK);

      // standard daemon practise...
      {
        int oval = 1;
        setsockopt (tcpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);
      }

      sockinfo si (THISNODE, PROT_TCPv4);

      if (bind (tcpv4_fd, si.sav4 (), si.salenv4 ()))
        {
          slog (L_ERR, _("can't bind tcpv4 on %s: %s"), (const char *)si, strerror (errno));
          exit (EXIT_FAILURE);
        }

      if (listen (tcpv4_fd, 5))
        {
          slog (L_ERR, _("can't listen tcpv4 on %s: %s"), (const char *)si, strerror (errno));
          exit (EXIT_FAILURE);
        }

      tcpv4_ev_watcher.start (tcpv4_fd, EVENT_READ);
    }
#endif

#if ENABLE_DNS
  if (THISNODE->protocols & PROT_DNSv4)
    {
      dns_forwarder.set (::conf.dns_forw_host, ::conf.dns_forw_port, PROT_DNSv4);

      dnsv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP);

      if (dnsv4_fd < 0)
        return -1;

#if defined(SOL_IP) && defined(IP_MTU_DISCOVER)
      // this I really consider a linux bug. I am neither connected
      // nor do I fragment myself. Linux still sets DF and doesn't
      // fragment for me sometimes.
      {
        int oval = IP_PMTUDISC_DONT;
        setsockopt (udpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);
      }
#endif

      // standard daemon practise...
      {
        int oval = 1;
        setsockopt (dnsv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);
      }

      sockinfo si (THISNODE->dns_hostname,
                   THISNODE->dns_hostname ? THISNODE->dns_port : 0,
                   PROT_DNSv4);

      if (bind (dnsv4_fd, si.sav4 (), si.salenv4 ()))
        {
          slog (L_ERR, _("can't bind dnsv4 on %s: %s"), (const char *)si, strerror (errno));
          exit (EXIT_FAILURE);
        }

      dnsv4_ev_watcher.start (dnsv4_fd, EVENT_READ);
    }
#endif

  tap = new tap_device ();
  if (!tap) //D this, of course, never catches
    {
      slog (L_ERR, _("cannot create network interface '%s'"), conf.ifname);
      exit (EXIT_FAILURE);
    }
  
  run_script (run_script_cb (this, &vpn::script_if_up), true);

  tap_ev_watcher.start (tap->fd, EVENT_READ);

  reconnect_all ();

  return 0;
}

bool
vpn::send_ipv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)
{
#if defined(SOL_IP) && defined(IP_TOS)
  setsockopt (ipv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);
#endif
  sendto (ipv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());

  return true;
}

static u16
ipv4_checksum (u16 *data, unsigned int len)
{
  // use 32 bit accumulator and fold back carry bits at the end
  u32 sum = 0;

  while (len > 1)
    {
      sum += *data++;
      len -= 2;
    }

  // odd byte left?
  if (len)
    sum += *(u8 *)data;

  // add back carry bits
  sum = (sum >> 16) + (sum & 0xffff);   // lo += hi
  sum += (sum >> 16);                   // carry

  return ~sum;
}

#if ENABLE_ICMP
bool
vpn::send_icmpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)
{
#if defined(SOL_IP) && defined(IP_TOS)
  setsockopt (icmpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);
#endif

  pkt->unshift_hdr (4);

  icmp_header *hdr = (icmp_header *)&((*pkt)[0]);
  hdr->type = ::conf.icmp_type;
  hdr->code = 255;
  hdr->checksum = 0;
  hdr->checksum = ipv4_checksum ((u16 *)hdr, pkt->len);

  sendto (icmpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());

  return true;
}
#endif

bool
vpn::send_udpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)
{
#if defined(SOL_IP) && defined(IP_TOS)
  setsockopt (udpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);
#endif
  sendto (udpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());

  return true;
}

void
vpn::inject_data_packet (tap_packet *pkt, int dst)
{
  if (dst)
    {
      // unicast
      if (dst != THISNODE->id)
        conns[dst - 1]->inject_data_packet (pkt);
    }
  else
    {
      // broadcast, this is ugly, but due to the security policy
      // we have to connect to all hosts...
      for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)
        if ((*c)->conf != THISNODE)
          (*c)->inject_data_packet (pkt, true);
  }
}

void
vpn::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)
{
  unsigned int src = pkt->src ();
  unsigned int dst = pkt->dst ();

  slog (L_NOISE, _("<<?/%s received possible vpn packet type %d from %d to %d, length %d"),
        (const char *)rsi, pkt->typ (), pkt->src (), pkt->dst (), pkt->len);

  if (src == 0 || src > conns.size ()
      || dst > conns.size ()
      || pkt->typ () >= vpn_packet::PT_MAX)
    slog (L_WARN, _("(%s): received corrupted packet type %d (src %d, dst %d)"),
          (const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ());
  else if (dst > conns.size ())
    slog (L_WARN, _("(%s): received corrupted packet type %d (src %d, dst %d)"),
          (const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ());
  else
    {
      connection *c = conns[src - 1];

      if (dst == 0)
        slog (L_WARN, _("%s(%s): received broadcast (protocol violation)"),
              c->conf->nodename, (const char *)rsi);
      else if (dst != THISNODE->id)
        {
          if (THISNODE->routerprio)
            // the tos setting gets lost here. who cares.
            conns[dst - 1]->inject_vpn_packet (pkt);
          else
            slog (L_WARN,
                  _("%s(%s): forwarding request (=> %s), but we are no router"),
                  c->conf->nodename, (const char *)rsi,
                  conns[dst - 1]->conf->nodename);
        }
      else
        c->recv_vpn_packet (pkt, rsi);
    }
}

bool
vpn::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos)
{
  switch (si.prot)
    {
      case PROT_IPv4:
        return send_ipv4_packet (pkt, si, tos);
      case PROT_UDPv4:
        return send_udpv4_packet (pkt, si, tos);
#if ENABLE_TCP 
      case PROT_TCPv4:
        return send_tcpv4_packet (pkt, si, tos);
#endif
#if ENABLE_ICMP
      case PROT_ICMPv4:
        return send_icmpv4_packet (pkt, si, tos);
#endif
#if ENABLE_DNS
      case PROT_DNSv4:
        return send_dnsv4_packet (pkt, si, tos);
#endif

      default:
        slog (L_CRIT, _("%s: FATAL: trying to send packet with unsupported protocol"), (const char *)si);
    }

  return false;
}

void
vpn::ipv4_ev (io_watcher &w, short revents)
{
  if (revents & EVENT_READ)
    {
      vpn_packet *pkt = new vpn_packet;
      struct sockaddr_in sa;
      socklen_t sa_len = sizeof (sa);
      int len;

      len = recvfrom (w.fd, &((*pkt)[0]), MAXSIZE, 0, (sockaddr *)&sa, &sa_len);

      sockinfo si(sa, PROT_IPv4);

      if (len > 0)
        {
          pkt->len = len;

          // raw sockets deliver the ipv4 header, but don't expect it on sends
          pkt->skip_hdr (IP_OVERHEAD);

          recv_vpn_packet (pkt, si);
        }
      else
        {
          // probably ECONNRESET or somesuch
          slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno));
        }

      delete pkt;
    }
  else
    {
      slog (L_ERR,
            _("FATAL: unknown revents %08x in socket, terminating\n"),
            revents);
      exit (EXIT_FAILURE);
    }
}

#if ENABLE_ICMP
void
vpn::icmpv4_ev (io_watcher &w, short revents)
{
  if (revents & EVENT_READ)
    {
      vpn_packet *pkt = new vpn_packet;
      struct sockaddr_in sa;
      socklen_t sa_len = sizeof (sa);
      int len;

      len = recvfrom (w.fd, &((*pkt)[0]), MAXSIZE, 0, (sockaddr *)&sa, &sa_len);

      sockinfo si(sa, PROT_ICMPv4);

      if (len > 0)
        {
          pkt->len = len;

          icmp_header *hdr = (icmp_header *)&((*pkt)[IP_OVERHEAD]);

          if (hdr->type == ::conf.icmp_type
              && hdr->code == 255)
            {
              // raw sockets deliver the ipv4, but don't expect it on sends
              // this is slow, but...
              pkt->skip_hdr (ICMP_OVERHEAD);

              recv_vpn_packet (pkt, si);
            }
        }
      else
        {
          // probably ECONNRESET or somesuch
          slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno));
        }

      delete pkt;
    }
  else
    {
      slog (L_ERR,
              _("FATAL: unknown revents %08x in socket, terminating\n"),
              revents);
      exit (EXIT_FAILURE);
    }
}
#endif

void
vpn::udpv4_ev (io_watcher &w, short revents)
{
  if (revents & EVENT_READ)
    {
      vpn_packet *pkt = new vpn_packet;
      struct sockaddr_in sa;
      socklen_t sa_len = sizeof (sa);
      int len;

      len = recvfrom (w.fd, &((*pkt)[0]), MAXSIZE, 0, (sockaddr *)&sa, &sa_len);

      sockinfo si(sa, PROT_UDPv4);

      if (len > 0)
        {
          pkt->len = len;

          recv_vpn_packet (pkt, si);
        }
      else
        {
          // probably ECONNRESET or somesuch
          slog (L_DEBUG, _("%s: fd %d, %s"), (const char *)si, w.fd, strerror (errno));
        }

      delete pkt;
    }
  else
    {
      slog (L_ERR,
              _("FATAL: unknown revents %08x in socket, terminating\n"),
              revents);
      exit (EXIT_FAILURE);
    }
}

void
vpn::tap_ev (io_watcher &w, short revents)
{
  if (revents & EVENT_READ)
    {
      /* process data */
      tap_packet *pkt;

      pkt = tap->recv ();

      if (!pkt)
        return;

      if (pkt->len > 14)
        {
          int dst = mac2id (pkt->dst);
          int src = mac2id (pkt->src);

          if (src != THISNODE->id)
            {
              slog (L_ERR, _("FATAL: tap packet not originating on current node received (if-up script not working properly?), exiting."));
              exit (EXIT_FAILURE);
            }

          if (dst == THISNODE->id)
            {
              slog (L_ERR, _("FATAL: tap packet destined for current node received, exiting."));
              exit (EXIT_FAILURE);
            }

          if (dst > conns.size ())
            slog (L_ERR, _("tap packet for unknown node %d received, ignoring."), dst);
          else
            inject_data_packet (pkt, dst);
        }

      delete pkt;
    }
  else
    abort ();
}

void
vpn::event_cb (time_watcher &w)
{
  if (events)
    {
      if (events & EVENT_SHUTDOWN)
        {
          slog (L_INFO, _("preparing shutdown..."));

          shutdown_all ();
          remove_pid (conf.pidfilename);
          slog (L_INFO, _("terminating"));
          exit (EXIT_SUCCESS);
        }

      if (events & EVENT_RECONNECT)
        {
          slog (L_INFO, _("forced reconnect"));

          reconnect_all ();
        }

      events = 0;
    }
}

void
vpn::shutdown_all ()
{
  for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)
    (*c)->shutdown ();
}

void
vpn::reconnect_all ()
{
  for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)
    delete *c;

  conns.clear ();

  connection_init ();

  for (configuration::node_vector::iterator i = conf.nodes.begin ();
       i != conf.nodes.end (); ++i)
    {
      connection *conn = new connection (this, *i);
      conns.push_back (conn);
      conn->establish_connection ();
    }
}

connection *vpn::find_router ()
{
  u32 prio = 1;
  connection *router = 0;

  for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)
    {
      connection *c = *i;

      if (c->conf->routerprio > prio
          && c->connectmode == conf_node::C_ALWAYS // so we don't drop the connection if in use
          && c->ictx && c->octx
          && c->conf != THISNODE)                  // redundant, since ictx==octx==0 always on thisnode
        {
          prio = c->conf->routerprio;
          router = c;
        }
    }

  return router;
}

void vpn::send_connect_request (int id)
{
  connection *c = find_router ();

  if (c)
    c->send_connect_request (id);
  else
    // no router found, aggressively connect to all routers
    for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)
      if ((*i)->conf->routerprio && (*i)->conf != THISNODE)
        (*i)->establish_connection ();
}

void
connection::dump_status ()
{
  slog (L_NOTICE, _("node %s (id %d)"), conf->nodename, conf->id);
  slog (L_NOTICE, _("  connectmode %d (%d) / sockaddr %s / minor %d"),
        connectmode, conf->connectmode, (const char *)si, (int)prot_minor);
  slog (L_NOTICE, _("  ictx/octx %08lx/%08lx / oseqno %d / retry_cnt %d"),
        (long)ictx, (long)octx, (int)oseqno, (int)retry_cnt);
  slog (L_NOTICE, _("  establish_conn %ld / rekey %ld / keepalive %ld"),
        (long)(establish_connection.at), (long)(rekey.at), (long)(keepalive.at));
}

void
vpn::dump_status ()
{
  slog (L_NOTICE, _("BEGIN status dump (%ld)"), (long)NOW);

  for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)
    (*c)->dump_status ();

  slog (L_NOTICE, _("END status dump"));
}

vpn::vpn (void)
: event            (this, &vpn::event_cb)
, udpv4_ev_watcher (this, &vpn::udpv4_ev)
, ipv4_ev_watcher  (this, &vpn::ipv4_ev)
#if ENABLE_TCP
, tcpv4_ev_watcher (this, &vpn::tcpv4_ev)
#endif
#if ENABLE_ICMP
, icmpv4_ev_watcher(this, &vpn::icmpv4_ev)
#endif
#if ENABLE_DNS
, dnsv4_ev_watcher (this, &vpn::dnsv4_ev)
#endif
, tap_ev_watcher   (this, &vpn::tap_ev)
{
}

vpn::~vpn ()
{
}

Revision:	1.32
Committed:	Mon Mar 7 01:31:26 2005 UTC (19 years, 2 months ago) by pcg
Content type:	text/plain
Branch:	MAIN
CVS Tags:	rel-1_8
Changes since 1.31:	+10 -0 lines
Log Message:	* empty log message *
#	User	Rev	Content
1	pcg	1.1	/*
2			vpn.C -- handle the protocol, encryption, handshaking etc.
3	pcg	1.28	Copyright (C) 2003-2005 Marc Lehmann <gvpe@schmorp.de>
4	pcg	1.1
5	pcg	1.28	This file is part of GVPE.
6
7			GVPE is free software; you can redistribute it and/or modify
8	pcg	1.1	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	pcg	1.28	along with gvpe; if not, write to the Free Software
19	pcg	1.1	Foundation, Inc. 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
20			*/
21
22			#include "config.h"
23
24			#include <list>
25
26	pcg	1.23	#include <cstdio>
27			#include <cstring>
28	pcg	1.1	#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	pcg	1.11	#include <fcntl.h>
37	pcg	1.14	#include <sys/socket.h>
38	pcg	1.15
39			#include "netcompat.h"
40	pcg	1.1
41			#include "pidfile.h"
42
43			#include "connection.h"
44			#include "util.h"
45			#include "vpn.h"
46
47	pcg	1.20	vpn network; // THE vpn (bad design...)
48
49	pcg	1.1	/////////////////////////////////////////////////////////////////////////////
50
51	pcg	1.2	const char *vpn::script_if_up ()
52	pcg	1.1	{
53			// the tunnel device mtu should be the physical mtu - overhead
54			// the tricky part is rounding to the cipher key blocksize
55			int mtu = conf.mtu - ETH_OVERHEAD - VPE_OVERHEAD - MAX_OVERHEAD;
56			mtu += ETH_OVERHEAD - 6 - 6; // now we have the data portion
57			mtu -= mtu % EVP_CIPHER_block_size (CIPHER); // round
58			mtu -= ETH_OVERHEAD - 6 - 6; // and get interface mtu again
59
60			char *env;
61	pcg	1.21	asprintf (&env, "CONFBASE=%s", confbase); putenv (env);
62			asprintf (&env, "NODENAME=%s", THISNODE->nodename); putenv (env);
63			asprintf (&env, "NODEID=%d", THISNODE->id); putenv (env);
64			asprintf (&env, "IFNAME=%s", tap->interface ()); putenv (env);
65			asprintf (&env, "IFTYPE=%s", IFTYPE); putenv (env);
66			asprintf (&env, "IFSUBTYPE=%s", IFSUBTYPE); putenv (env);
67			asprintf (&env, "MTU=%d", mtu); putenv (env);
68	pcg	1.1	asprintf (&env, "MAC=%02x:%02x:%02x:%02x:%02x:%02x",
69			0xfe, 0xfd, 0x80, 0x00, THISNODE->id >> 8,
70			THISNODE->id & 0xff);
71			putenv (env);
72
73			return ::conf.script_if_up ? ::conf.script_if_up : "if-up";
74			}
75
76			int
77			vpn::setup ()
78			{
79	pcg	1.8	ipv4_fd = -1;
80	pcg	1.1
81	pcg	1.8	if (THISNODE->protocols & PROT_IPv4 && ::conf.ip_proto)
82	pcg	1.1	{
83	pcg	1.8	ipv4_fd = socket (PF_INET, SOCK_RAW, ::conf.ip_proto);
84	pcg	1.1
85	pcg	1.8	if (ipv4_fd < 0)
86	pcg	1.1	return -1;
87
88	pcg	1.11	fcntl (ipv4_fd, F_SETFL, O_NONBLOCK);
89
90	pcg	1.14	#if defined(SOL_IP) && defined(IP_MTU_DISCOVER)
91	pcg	1.1	// this I really consider a linux bug. I am neither connected
92			// nor do I fragment myself. Linux still sets DF and doesn't
93			// fragment for me sometimes.
94			{
95			int oval = IP_PMTUDISC_DONT;
96	pcg	1.8	setsockopt (ipv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);
97	pcg	1.1	}
98			#endif
99
100	pcg	1.9	sockinfo si (THISNODE, PROT_IPv4);
101
102			if (bind (ipv4_fd, si.sav4 (), si.salenv4 ()))
103			{
104			slog (L_ERR, _("can't bind ipv4 socket on %s: %s"), (const char *)si, strerror (errno));
105	pcg	1.23	exit (EXIT_FAILURE);
106	pcg	1.9	}
107
108	pcg	1.22	ipv4_ev_watcher.start (ipv4_fd, EVENT_READ);
109	pcg	1.1	}
110
111	pcg	1.8	udpv4_fd = -1;
112
113			if (THISNODE->protocols & PROT_UDPv4 && THISNODE->udp_port)
114	pcg	1.1	{
115	pcg	1.8	udpv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP);
116	pcg	1.1
117	pcg	1.8	if (udpv4_fd < 0)
118	pcg	1.1	return -1;
119
120	pcg	1.11	fcntl (udpv4_fd, F_SETFL, O_NONBLOCK);
121
122	pcg	1.8	// standard daemon practise...
123			{
124			int oval = 1;
125			setsockopt (udpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);
126			}
127
128	pcg	1.14	#if defined(SOL_IP) && defined(IP_MTU_DISCOVER)
129	pcg	1.9	// 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 (udpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);
135			}
136			#endif
137
138	pcg	1.8	sockinfo si (THISNODE, PROT_UDPv4);
139	pcg	1.2
140	pcg	1.8	if (bind (udpv4_fd, si.sav4 (), si.salenv4 ()))
141	pcg	1.1	{
142	pcg	1.8	slog (L_ERR, _("can't bind udpv4 on %s: %s"), (const char *)si, strerror (errno));
143	pcg	1.23	exit (EXIT_FAILURE);
144	pcg	1.1	}
145
146	pcg	1.22	udpv4_ev_watcher.start (udpv4_fd, EVENT_READ);
147	pcg	1.9	}
148
149			icmpv4_fd = -1;
150
151			#if ENABLE_ICMP
152			if (THISNODE->protocols & PROT_ICMPv4)
153			{
154			icmpv4_fd = socket (PF_INET, SOCK_RAW, IPPROTO_ICMP);
155
156			if (icmpv4_fd < 0)
157			return -1;
158
159	pcg	1.11	fcntl (icmpv4_fd, F_SETFL, O_NONBLOCK);
160
161	pcg	1.9	#ifdef ICMP_FILTER
162			{
163			icmp_filter oval;
164			oval.data = 0xffffffff;
165			if (::conf.icmp_type < 32)
166			oval.data &= ~(1 << ::conf.icmp_type);
167
168			setsockopt (icmpv4_fd, SOL_RAW, ICMP_FILTER, &oval, sizeof oval);
169			}
170			#endif
171
172	pcg	1.14	#if defined(SOL_IP) && defined(IP_MTU_DISCOVER)
173	pcg	1.1	// this I really consider a linux bug. I am neither connected
174			// nor do I fragment myself. Linux still sets DF and doesn't
175			// fragment for me sometimes.
176			{
177			int oval = IP_PMTUDISC_DONT;
178	pcg	1.8	setsockopt (udpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);
179	pcg	1.1	}
180			#endif
181
182	pcg	1.9	sockinfo si (THISNODE, PROT_ICMPv4);
183
184			if (bind (icmpv4_fd, si.sav4 (), si.salenv4 ()))
185			{
186			slog (L_ERR, _("can't bind icmpv4 on %s: %s"), (const char *)si, strerror (errno));
187	pcg	1.23	exit (EXIT_FAILURE);
188	pcg	1.9	}
189
190	pcg	1.22	icmpv4_ev_watcher.start (icmpv4_fd, EVENT_READ);
191	pcg	1.1	}
192	pcg	1.9	#endif
193	pcg	1.1
194	pcg	1.8	tcpv4_fd = -1;
195
196	pcg	1.2	#if ENABLE_TCP
197	pcg	1.8	if (THISNODE->protocols & PROT_TCPv4 && THISNODE->tcp_port)
198	pcg	1.2	{
199			tcpv4_fd = socket (PF_INET, SOCK_STREAM, IPPROTO_TCP);
200
201			if (tcpv4_fd < 0)
202			return -1;
203
204	pcg	1.11	fcntl (tcpv4_fd, F_SETFL, O_NONBLOCK);
205
206	pcg	1.3	// standard daemon practise...
207			{
208			int oval = 1;
209			setsockopt (tcpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);
210			}
211
212	pcg	1.2	sockinfo si (THISNODE, PROT_TCPv4);
213
214			if (bind (tcpv4_fd, si.sav4 (), si.salenv4 ()))
215			{
216			slog (L_ERR, _("can't bind tcpv4 on %s: %s"), (const char *)si, strerror (errno));
217	pcg	1.23	exit (EXIT_FAILURE);
218	pcg	1.2	}
219
220			if (listen (tcpv4_fd, 5))
221			{
222			slog (L_ERR, _("can't listen tcpv4 on %s: %s"), (const char *)si, strerror (errno));
223	pcg	1.23	exit (EXIT_FAILURE);
224	pcg	1.2	}
225
226	pcg	1.22	tcpv4_ev_watcher.start (tcpv4_fd, EVENT_READ);
227	pcg	1.2	}
228			#endif
229
230	pcg	1.24	#if ENABLE_DNS
231			if (THISNODE->protocols & PROT_DNSv4)
232			{
233	pcg	1.29	dns_forwarder.set (::conf.dns_forw_host, ::conf.dns_forw_port, PROT_DNSv4);
234
235	pcg	1.24	dnsv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP);
236
237			if (dnsv4_fd < 0)
238			return -1;
239
240	pcg	1.32	#if defined(SOL_IP) && defined(IP_MTU_DISCOVER)
241			// this I really consider a linux bug. I am neither connected
242			// nor do I fragment myself. Linux still sets DF and doesn't
243			// fragment for me sometimes.
244			{
245			int oval = IP_PMTUDISC_DONT;
246			setsockopt (udpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);
247			}
248			#endif
249
250	pcg	1.24	// standard daemon practise...
251			{
252			int oval = 1;
253	pcg	1.31	setsockopt (dnsv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);
254	pcg	1.24	}
255
256	pcg	1.31	sockinfo si (THISNODE->dns_hostname,
257			THISNODE->dns_hostname ? THISNODE->dns_port : 0,
258			PROT_DNSv4);
259	pcg	1.24
260			if (bind (dnsv4_fd, si.sav4 (), si.salenv4 ()))
261			{
262			slog (L_ERR, _("can't bind dnsv4 on %s: %s"), (const char *)si, strerror (errno));
263			exit (EXIT_FAILURE);
264			}
265
266			dnsv4_ev_watcher.start (dnsv4_fd, EVENT_READ);
267			}
268			#endif
269
270	pcg	1.1	tap = new tap_device ();
271			if (!tap) //D this, of course, never catches
272			{
273			slog (L_ERR, _("cannot create network interface '%s'"), conf.ifname);
274	pcg	1.23	exit (EXIT_FAILURE);
275	pcg	1.1	}
276
277			run_script (run_script_cb (this, &vpn::script_if_up), true);
278
279	pcg	1.22	tap_ev_watcher.start (tap->fd, EVENT_READ);
280	pcg	1.1
281			reconnect_all ();
282
283			return 0;
284			}
285
286	pcg	1.7	bool
287	pcg	1.1	vpn::send_ipv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)
288			{
289	pcg	1.14	#if defined(SOL_IP) && defined(IP_TOS)
290	pcg	1.1	setsockopt (ipv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);
291	pcg	1.14	#endif
292	pcg	1.1	sendto (ipv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());
293	pcg	1.7
294			return true;
295	pcg	1.1	}
296
297	pcg	1.9	static u16
298			ipv4_checksum (u16 *data, unsigned int len)
299			{
300			// use 32 bit accumulator and fold back carry bits at the end
301			u32 sum = 0;
302
303			while (len > 1)
304			{
305			sum += *data++;
306			len -= 2;
307			}
308
309			// odd byte left?
310			if (len)
311			sum += (u8 )data;
312
313			// add back carry bits
314			sum = (sum >> 16) + (sum & 0xffff); // lo += hi
315			sum += (sum >> 16); // carry
316
317			return ~sum;
318			}
319
320	pcg	1.13	#if ENABLE_ICMP
321	pcg	1.9	bool
322			vpn::send_icmpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)
323			{
324	pcg	1.14	#if defined(SOL_IP) && defined(IP_TOS)
325	pcg	1.9	setsockopt (icmpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);
326	pcg	1.14	#endif
327	pcg	1.9
328			pkt->unshift_hdr (4);
329
330	pcg	1.14	icmp_header hdr = (icmp_header )&((*pkt)[0]);
331	pcg	1.9	hdr->type = ::conf.icmp_type;
332			hdr->code = 255;
333			hdr->checksum = 0;
334			hdr->checksum = ipv4_checksum ((u16 *)hdr, pkt->len);
335
336			sendto (icmpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());
337
338			return true;
339			}
340	pcg	1.13	#endif
341	pcg	1.9
342	pcg	1.7	bool
343	pcg	1.1	vpn::send_udpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)
344			{
345	pcg	1.14	#if defined(SOL_IP) && defined(IP_TOS)
346	pcg	1.1	setsockopt (udpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);
347	pcg	1.14	#endif
348	pcg	1.1	sendto (udpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());
349	pcg	1.7
350			return true;
351	pcg	1.1	}
352
353			void
354	pcg	1.18	vpn::inject_data_packet (tap_packet *pkt, int dst)
355			{
356			if (dst)
357			{
358			// unicast
359			if (dst != THISNODE->id)
360			conns[dst - 1]->inject_data_packet (pkt);
361			}
362			else
363			{
364			// broadcast, this is ugly, but due to the security policy
365			// we have to connect to all hosts...
366			for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)
367			if ((*c)->conf != THISNODE)
368			(*c)->inject_data_packet (pkt, true);
369			}
370			}
371
372			void
373	pcg	1.1	vpn::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)
374			{
375			unsigned int src = pkt->src ();
376			unsigned int dst = pkt->dst ();
377
378			slog (L_NOISE, _("<<?/%s received possible vpn packet type %d from %d to %d, length %d"),
379			(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst (), pkt->len);
380
381			if (src == 0 \|\| src > conns.size ()
382			\|\| dst > conns.size ()
383			\|\| pkt->typ () >= vpn_packet::PT_MAX)
384			slog (L_WARN, _("(%s): received corrupted packet type %d (src %d, dst %d)"),
385			(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ());
386	pcg	1.6	else if (dst > conns.size ())
387			slog (L_WARN, _("(%s): received corrupted packet type %d (src %d, dst %d)"),
388			(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ());
389	pcg	1.1	else
390			{
391			connection *c = conns[src - 1];
392
393	pcg	1.13	if (dst == 0)
394			slog (L_WARN, _("%s(%s): received broadcast (protocol violation)"),
395	pcg	1.1	c->conf->nodename, (const char *)rsi);
396	pcg	1.18	else if (dst != THISNODE->id)
397	pcg	1.6	{
398			if (THISNODE->routerprio)
399			// the tos setting gets lost here. who cares.
400			conns[dst - 1]->inject_vpn_packet (pkt);
401			else
402			slog (L_WARN,
403			_("%s(%s): forwarding request (=> %s), but we are no router"),
404			c->conf->nodename, (const char *)rsi,
405			conns[dst - 1]->conf->nodename);
406			}
407	pcg	1.1	else
408			c->recv_vpn_packet (pkt, rsi);
409			}
410			}
411
412	pcg	1.31	bool
413			vpn::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos)
414			{
415			switch (si.prot)
416			{
417			case PROT_IPv4:
418			return send_ipv4_packet (pkt, si, tos);
419			case PROT_UDPv4:
420			return send_udpv4_packet (pkt, si, tos);
421			#if ENABLE_TCP
422			case PROT_TCPv4:
423			return send_tcpv4_packet (pkt, si, tos);
424			#endif
425			#if ENABLE_ICMP
426			case PROT_ICMPv4:
427			return send_icmpv4_packet (pkt, si, tos);
428			#endif
429			#if ENABLE_DNS
430			case PROT_DNSv4:
431			return send_dnsv4_packet (pkt, si, tos);
432			#endif
433
434			default:
435			slog (L_CRIT, _("%s: FATAL: trying to send packet with unsupported protocol"), (const char *)si);
436			}
437
438			return false;
439			}
440
441	pcg	1.1	void
442	pcg	1.9	vpn::ipv4_ev (io_watcher &w, short revents)
443	pcg	1.1	{
444	pcg	1.22	if (revents & EVENT_READ)
445	pcg	1.1	{
446			vpn_packet *pkt = new vpn_packet;
447			struct sockaddr_in sa;
448			socklen_t sa_len = sizeof (sa);
449			int len;
450
451	pcg	1.5	len = recvfrom (w.fd, &((pkt)[0]), MAXSIZE, 0, (sockaddr )&sa, &sa_len);
452	pcg	1.1
453	pcg	1.9	sockinfo si(sa, PROT_IPv4);
454	pcg	1.1
455			if (len > 0)
456			{
457			pkt->len = len;
458
459	pcg	1.30	// raw sockets deliver the ipv4 header, but don't expect it on sends
460	pcg	1.9	pkt->skip_hdr (IP_OVERHEAD);
461
462	pcg	1.1	recv_vpn_packet (pkt, si);
463			}
464			else
465			{
466			// probably ECONNRESET or somesuch
467	pcg	1.9	slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno));
468	pcg	1.1	}
469
470			delete pkt;
471			}
472			else
473			{
474			slog (L_ERR,
475	pcg	1.30	_("FATAL: unknown revents %08x in socket, terminating\n"),
476			revents);
477	pcg	1.23	exit (EXIT_FAILURE);
478	pcg	1.1	}
479			}
480
481	pcg	1.13	#if ENABLE_ICMP
482	pcg	1.1	void
483	pcg	1.9	vpn::icmpv4_ev (io_watcher &w, short revents)
484	pcg	1.1	{
485	pcg	1.22	if (revents & EVENT_READ)
486	pcg	1.1	{
487			vpn_packet *pkt = new vpn_packet;
488			struct sockaddr_in sa;
489			socklen_t sa_len = sizeof (sa);
490			int len;
491
492	pcg	1.5	len = recvfrom (w.fd, &((pkt)[0]), MAXSIZE, 0, (sockaddr )&sa, &sa_len);
493	pcg	1.1
494	pcg	1.9	sockinfo si(sa, PROT_ICMPv4);
495	pcg	1.1
496			if (len > 0)
497			{
498			pkt->len = len;
499
500	pcg	1.14	icmp_header hdr = (icmp_header )&((*pkt)[IP_OVERHEAD]);
501	pcg	1.9
502			if (hdr->type == ::conf.icmp_type
503			&& hdr->code == 255)
504			{
505			// raw sockets deliver the ipv4, but don't expect it on sends
506			// this is slow, but...
507			pkt->skip_hdr (ICMP_OVERHEAD);
508
509			recv_vpn_packet (pkt, si);
510			}
511			}
512			else
513			{
514			// probably ECONNRESET or somesuch
515			slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno));
516			}
517
518			delete pkt;
519			}
520			else
521			{
522			slog (L_ERR,
523			_("FATAL: unknown revents %08x in socket, terminating\n"),
524			revents);
525	pcg	1.23	exit (EXIT_FAILURE);
526	pcg	1.9	}
527			}
528	pcg	1.13	#endif
529	pcg	1.9
530			void
531			vpn::udpv4_ev (io_watcher &w, short revents)
532			{
533	pcg	1.22	if (revents & EVENT_READ)
534	pcg	1.9	{
535			vpn_packet *pkt = new vpn_packet;
536			struct sockaddr_in sa;
537			socklen_t sa_len = sizeof (sa);
538			int len;
539
540			len = recvfrom (w.fd, &((pkt)[0]), MAXSIZE, 0, (sockaddr )&sa, &sa_len);
541
542			sockinfo si(sa, PROT_UDPv4);
543
544			if (len > 0)
545			{
546			pkt->len = len;
547	pcg	1.1
548			recv_vpn_packet (pkt, si);
549			}
550			else
551			{
552			// probably ECONNRESET or somesuch
553	pcg	1.9	slog (L_DEBUG, _("%s: fd %d, %s"), (const char *)si, w.fd, strerror (errno));
554	pcg	1.1	}
555
556			delete pkt;
557			}
558			else
559			{
560			slog (L_ERR,
561			_("FATAL: unknown revents %08x in socket, terminating\n"),
562			revents);
563	pcg	1.23	exit (EXIT_FAILURE);
564	pcg	1.1	}
565			}
566	pcg	1.2
567			void
568	pcg	1.3	vpn::tap_ev (io_watcher &w, short revents)
569	pcg	1.1	{
570	pcg	1.22	if (revents & EVENT_READ)
571	pcg	1.1	{
572			/* process data */
573			tap_packet *pkt;
574
575			pkt = tap->recv ();
576
577	pcg	1.17	if (!pkt)
578			return;
579	pcg	1.1
580	pcg	1.17	if (pkt->len > 14)
581	pcg	1.1	{
582	pcg	1.17	int dst = mac2id (pkt->dst);
583			int src = mac2id (pkt->src);
584	pcg	1.1
585	pcg	1.17	if (src != THISNODE->id)
586			{
587	pcg	1.30	slog (L_ERR, _("FATAL: tap packet not originating on current node received (if-up script not working properly?), exiting."));
588	pcg	1.23	exit (EXIT_FAILURE);
589	pcg	1.17	}
590	pcg	1.1
591	pcg	1.17	if (dst == THISNODE->id)
592	pcg	1.1	{
593	pcg	1.17	slog (L_ERR, _("FATAL: tap packet destined for current node received, exiting."));
594	pcg	1.23	exit (EXIT_FAILURE);
595	pcg	1.1	}
596	pcg	1.17
597			if (dst > conns.size ())
598			slog (L_ERR, _("tap packet for unknown node %d received, ignoring."), dst);
599	pcg	1.1	else
600	pcg	1.18	inject_data_packet (pkt, dst);
601	pcg	1.1	}
602
603			delete pkt;
604			}
605			else
606			abort ();
607			}
608
609			void
610	pcg	1.3	vpn::event_cb (time_watcher &w)
611	pcg	1.1	{
612			if (events)
613			{
614			if (events & EVENT_SHUTDOWN)
615			{
616			slog (L_INFO, _("preparing shutdown..."));
617
618			shutdown_all ();
619	pcg	1.24	remove_pid (conf.pidfilename);
620	pcg	1.1	slog (L_INFO, _("terminating"));
621	pcg	1.23	exit (EXIT_SUCCESS);
622	pcg	1.1	}
623
624			if (events & EVENT_RECONNECT)
625			{
626			slog (L_INFO, _("forced reconnect"));
627
628			reconnect_all ();
629			}
630
631			events = 0;
632			}
633			}
634
635			void
636			vpn::shutdown_all ()
637			{
638			for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)
639			(*c)->shutdown ();
640			}
641
642			void
643			vpn::reconnect_all ()
644			{
645			for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)
646			delete *c;
647
648			conns.clear ();
649
650			connection_init ();
651
652			for (configuration::node_vector::iterator i = conf.nodes.begin ();
653			i != conf.nodes.end (); ++i)
654			{
655	pcg	1.27	connection conn = new connection (this, i);
656	pcg	1.1	conns.push_back (conn);
657			conn->establish_connection ();
658			}
659			}
660
661			connection *vpn::find_router ()
662			{
663	pcg	1.26	u32 prio = 1;
664	pcg	1.1	connection *router = 0;
665
666			for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)
667			{
668			connection c = i;
669
670	pcg	1.13	if (c->conf->routerprio > prio
671	pcg	1.11	&& c->connectmode == conf_node::C_ALWAYS // so we don't drop the connection if in use
672			&& c->ictx && c->octx
673	pcg	1.13	&& c->conf != THISNODE) // redundant, since ictx==octx==0 always on thisnode
674	pcg	1.1	{
675			prio = c->conf->routerprio;
676			router = c;
677			}
678			}
679
680			return router;
681			}
682
683	pcg	1.7	void vpn::send_connect_request (int id)
684	pcg	1.1	{
685			connection *c = find_router ();
686
687			if (c)
688	pcg	1.7	c->send_connect_request (id);
689			else
690			// no router found, aggressively connect to all routers
691			for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)
692	pcg	1.13	if ((i)->conf->routerprio && (i)->conf != THISNODE)
693	pcg	1.7	(*i)->establish_connection ();
694	pcg	1.1	}
695
696			void
697			connection::dump_status ()
698			{
699			slog (L_NOTICE, _("node %s (id %d)"), conf->nodename, conf->id);
700			slog (L_NOTICE, _(" connectmode %d (%d) / sockaddr %s / minor %d"),
701			connectmode, conf->connectmode, (const char *)si, (int)prot_minor);
702			slog (L_NOTICE, _(" ictx/octx %08lx/%08lx / oseqno %d / retry_cnt %d"),
703			(long)ictx, (long)octx, (int)oseqno, (int)retry_cnt);
704			slog (L_NOTICE, _(" establish_conn %ld / rekey %ld / keepalive %ld"),
705			(long)(establish_connection.at), (long)(rekey.at), (long)(keepalive.at));
706			}
707
708			void
709			vpn::dump_status ()
710			{
711			slog (L_NOTICE, _("BEGIN status dump (%ld)"), (long)NOW);
712
713			for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)
714			(*c)->dump_status ();
715
716			slog (L_NOTICE, _("END status dump"));
717			}
718
719			vpn::vpn (void)
720	pcg	1.9	: event (this, &vpn::event_cb)
721			, udpv4_ev_watcher (this, &vpn::udpv4_ev)
722			, ipv4_ev_watcher (this, &vpn::ipv4_ev)
723	pcg	1.2	#if ENABLE_TCP
724	pcg	1.9	, tcpv4_ev_watcher (this, &vpn::tcpv4_ev)
725			#endif
726			#if ENABLE_ICMP
727			, icmpv4_ev_watcher(this, &vpn::icmpv4_ev)
728	pcg	1.24	#endif
729			#if ENABLE_DNS
730			, dnsv4_ev_watcher (this, &vpn::dnsv4_ev)
731	pcg	1.2	#endif
732	pcg	1.9	, tap_ev_watcher (this, &vpn::tap_ev)
733	pcg	1.1	{
734			}
735
736			vpn::~vpn ()
737			{
738			}
739