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...)

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

void
vpn::script_init_env ()
{
  // 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);

  // TODO: info for other nodes, maybe?
}

const char *vpn::script_if_init ()
{
  script_init_env ();

  return tap->if_up ();
}

const char *vpn::script_if_up ()
{
  script_init_env ();

  char *filename;
  asprintf (&filename,
            "%s/%s",
            confbase,
            ::conf.script_if_up ? ::conf.script_if_up : "if-up");

  return filename;
}

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);
    }
  
  if (tap->if_up () &&
      !run_script (run_script_cb (this, &vpn::script_if_init), true))
    {
      slog (L_ERR, _("interface initialization command '%s' failed, exiting."),
            tap->if_up ());
      exit (EXIT_FAILURE);
    }

  if (!run_script (run_script_cb (this, &vpn::script_if_up), true))
    {
      slog (L_ERR, _("if-up command execution failed, exiting."));
      exit (EXIT_FAILURE);
    }

  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:	1.33
Committed:	Wed Mar 23 21:55:39 2005 UTC (19 years, 2 months ago) by pcg
Content type:	text/plain
Branch:	MAIN
Changes since 1.32:	+37 -5 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	1.33	void
52			vpn::script_init_env ()
53	pcg	1.1	{
54			// the tunnel device mtu should be the physical mtu - overhead
55			// the tricky part is rounding to the cipher key blocksize
56			int mtu = conf.mtu - ETH_OVERHEAD - VPE_OVERHEAD - MAX_OVERHEAD;
57			mtu += ETH_OVERHEAD - 6 - 6; // now we have the data portion
58			mtu -= mtu % EVP_CIPHER_block_size (CIPHER); // round
59			mtu -= ETH_OVERHEAD - 6 - 6; // and get interface mtu again
60
61			char *env;
62	pcg	1.21	asprintf (&env, "CONFBASE=%s", confbase); putenv (env);
63			asprintf (&env, "NODENAME=%s", THISNODE->nodename); putenv (env);
64			asprintf (&env, "NODEID=%d", THISNODE->id); putenv (env);
65			asprintf (&env, "IFNAME=%s", tap->interface ()); putenv (env);
66			asprintf (&env, "IFTYPE=%s", IFTYPE); putenv (env);
67			asprintf (&env, "IFSUBTYPE=%s", IFSUBTYPE); putenv (env);
68			asprintf (&env, "MTU=%d", mtu); putenv (env);
69	pcg	1.1	asprintf (&env, "MAC=%02x:%02x:%02x:%02x:%02x:%02x",
70			0xfe, 0xfd, 0x80, 0x00, THISNODE->id >> 8,
71	pcg	1.33	THISNODE->id & 0xff); putenv (env);
72
73			// TODO: info for other nodes, maybe?
74			}
75
76			const char *vpn::script_if_init ()
77			{
78			script_init_env ();
79	pcg	1.1
80	pcg	1.33	return tap->if_up ();
81			}
82
83			const char *vpn::script_if_up ()
84			{
85			script_init_env ();
86
87			char *filename;
88			asprintf (&filename,
89			"%s/%s",
90			confbase,
91			::conf.script_if_up ? ::conf.script_if_up : "if-up");
92
93			return filename;
94	pcg	1.1	}
95
96			int
97			vpn::setup ()
98			{
99	pcg	1.8	ipv4_fd = -1;
100	pcg	1.1
101	pcg	1.8	if (THISNODE->protocols & PROT_IPv4 && ::conf.ip_proto)
102	pcg	1.1	{
103	pcg	1.8	ipv4_fd = socket (PF_INET, SOCK_RAW, ::conf.ip_proto);
104	pcg	1.1
105	pcg	1.8	if (ipv4_fd < 0)
106	pcg	1.1	return -1;
107
108	pcg	1.11	fcntl (ipv4_fd, F_SETFL, O_NONBLOCK);
109
110	pcg	1.14	#if defined(SOL_IP) && defined(IP_MTU_DISCOVER)
111	pcg	1.1	// this I really consider a linux bug. I am neither connected
112			// nor do I fragment myself. Linux still sets DF and doesn't
113			// fragment for me sometimes.
114			{
115			int oval = IP_PMTUDISC_DONT;
116	pcg	1.8	setsockopt (ipv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);
117	pcg	1.1	}
118			#endif
119
120	pcg	1.9	sockinfo si (THISNODE, PROT_IPv4);
121
122			if (bind (ipv4_fd, si.sav4 (), si.salenv4 ()))
123			{
124			slog (L_ERR, _("can't bind ipv4 socket on %s: %s"), (const char *)si, strerror (errno));
125	pcg	1.23	exit (EXIT_FAILURE);
126	pcg	1.9	}
127
128	pcg	1.22	ipv4_ev_watcher.start (ipv4_fd, EVENT_READ);
129	pcg	1.1	}
130
131	pcg	1.8	udpv4_fd = -1;
132
133			if (THISNODE->protocols & PROT_UDPv4 && THISNODE->udp_port)
134	pcg	1.1	{
135	pcg	1.8	udpv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP);
136	pcg	1.1
137	pcg	1.8	if (udpv4_fd < 0)
138	pcg	1.1	return -1;
139
140	pcg	1.11	fcntl (udpv4_fd, F_SETFL, O_NONBLOCK);
141
142	pcg	1.8	// standard daemon practise...
143			{
144			int oval = 1;
145			setsockopt (udpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);
146			}
147
148	pcg	1.14	#if defined(SOL_IP) && defined(IP_MTU_DISCOVER)
149	pcg	1.9	// this I really consider a linux bug. I am neither connected
150			// nor do I fragment myself. Linux still sets DF and doesn't
151			// fragment for me sometimes.
152			{
153			int oval = IP_PMTUDISC_DONT;
154			setsockopt (udpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);
155			}
156			#endif
157
158	pcg	1.8	sockinfo si (THISNODE, PROT_UDPv4);
159	pcg	1.2
160	pcg	1.8	if (bind (udpv4_fd, si.sav4 (), si.salenv4 ()))
161	pcg	1.1	{
162	pcg	1.8	slog (L_ERR, _("can't bind udpv4 on %s: %s"), (const char *)si, strerror (errno));
163	pcg	1.23	exit (EXIT_FAILURE);
164	pcg	1.1	}
165
166	pcg	1.22	udpv4_ev_watcher.start (udpv4_fd, EVENT_READ);
167	pcg	1.9	}
168
169			icmpv4_fd = -1;
170
171			#if ENABLE_ICMP
172			if (THISNODE->protocols & PROT_ICMPv4)
173			{
174			icmpv4_fd = socket (PF_INET, SOCK_RAW, IPPROTO_ICMP);
175
176			if (icmpv4_fd < 0)
177			return -1;
178
179	pcg	1.11	fcntl (icmpv4_fd, F_SETFL, O_NONBLOCK);
180
181	pcg	1.9	#ifdef ICMP_FILTER
182			{
183			icmp_filter oval;
184			oval.data = 0xffffffff;
185			if (::conf.icmp_type < 32)
186			oval.data &= ~(1 << ::conf.icmp_type);
187
188			setsockopt (icmpv4_fd, SOL_RAW, ICMP_FILTER, &oval, sizeof oval);
189			}
190			#endif
191
192	pcg	1.14	#if defined(SOL_IP) && defined(IP_MTU_DISCOVER)
193	pcg	1.1	// this I really consider a linux bug. I am neither connected
194			// nor do I fragment myself. Linux still sets DF and doesn't
195			// fragment for me sometimes.
196			{
197			int oval = IP_PMTUDISC_DONT;
198	pcg	1.8	setsockopt (udpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);
199	pcg	1.1	}
200			#endif
201
202	pcg	1.9	sockinfo si (THISNODE, PROT_ICMPv4);
203
204			if (bind (icmpv4_fd, si.sav4 (), si.salenv4 ()))
205			{
206			slog (L_ERR, _("can't bind icmpv4 on %s: %s"), (const char *)si, strerror (errno));
207	pcg	1.23	exit (EXIT_FAILURE);
208	pcg	1.9	}
209
210	pcg	1.22	icmpv4_ev_watcher.start (icmpv4_fd, EVENT_READ);
211	pcg	1.1	}
212	pcg	1.9	#endif
213	pcg	1.1
214	pcg	1.8	tcpv4_fd = -1;
215
216	pcg	1.2	#if ENABLE_TCP
217	pcg	1.8	if (THISNODE->protocols & PROT_TCPv4 && THISNODE->tcp_port)
218	pcg	1.2	{
219			tcpv4_fd = socket (PF_INET, SOCK_STREAM, IPPROTO_TCP);
220
221			if (tcpv4_fd < 0)
222			return -1;
223
224	pcg	1.11	fcntl (tcpv4_fd, F_SETFL, O_NONBLOCK);
225
226	pcg	1.3	// standard daemon practise...
227			{
228			int oval = 1;
229			setsockopt (tcpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);
230			}
231
232	pcg	1.2	sockinfo si (THISNODE, PROT_TCPv4);
233
234			if (bind (tcpv4_fd, si.sav4 (), si.salenv4 ()))
235			{
236			slog (L_ERR, _("can't bind tcpv4 on %s: %s"), (const char *)si, strerror (errno));
237	pcg	1.23	exit (EXIT_FAILURE);
238	pcg	1.2	}
239
240			if (listen (tcpv4_fd, 5))
241			{
242			slog (L_ERR, _("can't listen tcpv4 on %s: %s"), (const char *)si, strerror (errno));
243	pcg	1.23	exit (EXIT_FAILURE);
244	pcg	1.2	}
245
246	pcg	1.22	tcpv4_ev_watcher.start (tcpv4_fd, EVENT_READ);
247	pcg	1.2	}
248			#endif
249
250	pcg	1.24	#if ENABLE_DNS
251			if (THISNODE->protocols & PROT_DNSv4)
252			{
253	pcg	1.29	dns_forwarder.set (::conf.dns_forw_host, ::conf.dns_forw_port, PROT_DNSv4);
254
255	pcg	1.24	dnsv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP);
256
257			if (dnsv4_fd < 0)
258			return -1;
259
260	pcg	1.32	#if defined(SOL_IP) && defined(IP_MTU_DISCOVER)
261			// this I really consider a linux bug. I am neither connected
262			// nor do I fragment myself. Linux still sets DF and doesn't
263			// fragment for me sometimes.
264			{
265			int oval = IP_PMTUDISC_DONT;
266			setsockopt (udpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);
267			}
268			#endif
269
270	pcg	1.24	// standard daemon practise...
271			{
272			int oval = 1;
273	pcg	1.31	setsockopt (dnsv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);
274	pcg	1.24	}
275
276	pcg	1.31	sockinfo si (THISNODE->dns_hostname,
277			THISNODE->dns_hostname ? THISNODE->dns_port : 0,
278			PROT_DNSv4);
279	pcg	1.24
280			if (bind (dnsv4_fd, si.sav4 (), si.salenv4 ()))
281			{
282			slog (L_ERR, _("can't bind dnsv4 on %s: %s"), (const char *)si, strerror (errno));
283			exit (EXIT_FAILURE);
284			}
285
286			dnsv4_ev_watcher.start (dnsv4_fd, EVENT_READ);
287			}
288			#endif
289
290	pcg	1.1	tap = new tap_device ();
291			if (!tap) //D this, of course, never catches
292			{
293			slog (L_ERR, _("cannot create network interface '%s'"), conf.ifname);
294	pcg	1.23	exit (EXIT_FAILURE);
295	pcg	1.1	}
296
297	pcg	1.33	if (tap->if_up () &&
298			!run_script (run_script_cb (this, &vpn::script_if_init), true))
299			{
300			slog (L_ERR, _("interface initialization command '%s' failed, exiting."),
301			tap->if_up ());
302			exit (EXIT_FAILURE);
303			}
304
305			if (!run_script (run_script_cb (this, &vpn::script_if_up), true))
306			{
307			slog (L_ERR, _("if-up command execution failed, exiting."));
308			exit (EXIT_FAILURE);
309			}
310	pcg	1.1
311	pcg	1.22	tap_ev_watcher.start (tap->fd, EVENT_READ);
312	pcg	1.1
313			reconnect_all ();
314
315			return 0;
316			}
317
318	pcg	1.7	bool
319	pcg	1.1	vpn::send_ipv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)
320			{
321	pcg	1.14	#if defined(SOL_IP) && defined(IP_TOS)
322	pcg	1.1	setsockopt (ipv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);
323	pcg	1.14	#endif
324	pcg	1.1	sendto (ipv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());
325	pcg	1.7
326			return true;
327	pcg	1.1	}
328
329	pcg	1.9	static u16
330			ipv4_checksum (u16 *data, unsigned int len)
331			{
332			// use 32 bit accumulator and fold back carry bits at the end
333			u32 sum = 0;
334
335			while (len > 1)
336			{
337			sum += *data++;
338			len -= 2;
339			}
340
341			// odd byte left?
342			if (len)
343			sum += (u8 )data;
344
345			// add back carry bits
346			sum = (sum >> 16) + (sum & 0xffff); // lo += hi
347			sum += (sum >> 16); // carry
348
349			return ~sum;
350			}
351
352	pcg	1.13	#if ENABLE_ICMP
353	pcg	1.9	bool
354			vpn::send_icmpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)
355			{
356	pcg	1.14	#if defined(SOL_IP) && defined(IP_TOS)
357	pcg	1.9	setsockopt (icmpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);
358	pcg	1.14	#endif
359	pcg	1.9
360			pkt->unshift_hdr (4);
361
362	pcg	1.14	icmp_header hdr = (icmp_header )&((*pkt)[0]);
363	pcg	1.9	hdr->type = ::conf.icmp_type;
364			hdr->code = 255;
365			hdr->checksum = 0;
366			hdr->checksum = ipv4_checksum ((u16 *)hdr, pkt->len);
367
368			sendto (icmpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());
369
370			return true;
371			}
372	pcg	1.13	#endif
373	pcg	1.9
374	pcg	1.7	bool
375	pcg	1.1	vpn::send_udpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)
376			{
377	pcg	1.14	#if defined(SOL_IP) && defined(IP_TOS)
378	pcg	1.1	setsockopt (udpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);
379	pcg	1.14	#endif
380	pcg	1.1	sendto (udpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());
381	pcg	1.7
382			return true;
383	pcg	1.1	}
384
385			void
386	pcg	1.18	vpn::inject_data_packet (tap_packet *pkt, int dst)
387			{
388			if (dst)
389			{
390			// unicast
391			if (dst != THISNODE->id)
392			conns[dst - 1]->inject_data_packet (pkt);
393			}
394			else
395			{
396			// broadcast, this is ugly, but due to the security policy
397			// we have to connect to all hosts...
398			for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)
399			if ((*c)->conf != THISNODE)
400			(*c)->inject_data_packet (pkt, true);
401			}
402			}
403
404			void
405	pcg	1.1	vpn::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)
406			{
407			unsigned int src = pkt->src ();
408			unsigned int dst = pkt->dst ();
409
410			slog (L_NOISE, _("<<?/%s received possible vpn packet type %d from %d to %d, length %d"),
411			(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst (), pkt->len);
412
413			if (src == 0 \|\| src > conns.size ()
414			\|\| dst > conns.size ()
415			\|\| pkt->typ () >= vpn_packet::PT_MAX)
416			slog (L_WARN, _("(%s): received corrupted packet type %d (src %d, dst %d)"),
417			(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ());
418	pcg	1.6	else if (dst > conns.size ())
419			slog (L_WARN, _("(%s): received corrupted packet type %d (src %d, dst %d)"),
420			(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ());
421	pcg	1.1	else
422			{
423			connection *c = conns[src - 1];
424
425	pcg	1.13	if (dst == 0)
426			slog (L_WARN, _("%s(%s): received broadcast (protocol violation)"),
427	pcg	1.1	c->conf->nodename, (const char *)rsi);
428	pcg	1.18	else if (dst != THISNODE->id)
429	pcg	1.6	{
430			if (THISNODE->routerprio)
431			// the tos setting gets lost here. who cares.
432			conns[dst - 1]->inject_vpn_packet (pkt);
433			else
434			slog (L_WARN,
435			_("%s(%s): forwarding request (=> %s), but we are no router"),
436			c->conf->nodename, (const char *)rsi,
437			conns[dst - 1]->conf->nodename);
438			}
439	pcg	1.1	else
440			c->recv_vpn_packet (pkt, rsi);
441			}
442			}
443
444	pcg	1.31	bool
445			vpn::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos)
446			{
447			switch (si.prot)
448			{
449			case PROT_IPv4:
450			return send_ipv4_packet (pkt, si, tos);
451			case PROT_UDPv4:
452			return send_udpv4_packet (pkt, si, tos);
453			#if ENABLE_TCP
454			case PROT_TCPv4:
455			return send_tcpv4_packet (pkt, si, tos);
456			#endif
457			#if ENABLE_ICMP
458			case PROT_ICMPv4:
459			return send_icmpv4_packet (pkt, si, tos);
460			#endif
461			#if ENABLE_DNS
462			case PROT_DNSv4:
463			return send_dnsv4_packet (pkt, si, tos);
464			#endif
465
466			default:
467			slog (L_CRIT, _("%s: FATAL: trying to send packet with unsupported protocol"), (const char *)si);
468			}
469
470			return false;
471			}
472
473	pcg	1.1	void
474	pcg	1.9	vpn::ipv4_ev (io_watcher &w, short revents)
475	pcg	1.1	{
476	pcg	1.22	if (revents & EVENT_READ)
477	pcg	1.1	{
478			vpn_packet *pkt = new vpn_packet;
479			struct sockaddr_in sa;
480			socklen_t sa_len = sizeof (sa);
481			int len;
482
483	pcg	1.5	len = recvfrom (w.fd, &((pkt)[0]), MAXSIZE, 0, (sockaddr )&sa, &sa_len);
484	pcg	1.1
485	pcg	1.9	sockinfo si(sa, PROT_IPv4);
486	pcg	1.1
487			if (len > 0)
488			{
489			pkt->len = len;
490
491	pcg	1.30	// raw sockets deliver the ipv4 header, but don't expect it on sends
492	pcg	1.9	pkt->skip_hdr (IP_OVERHEAD);
493
494	pcg	1.1	recv_vpn_packet (pkt, si);
495			}
496			else
497			{
498			// probably ECONNRESET or somesuch
499	pcg	1.9	slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno));
500	pcg	1.1	}
501
502			delete pkt;
503			}
504			else
505			{
506			slog (L_ERR,
507	pcg	1.30	_("FATAL: unknown revents %08x in socket, terminating\n"),
508			revents);
509	pcg	1.23	exit (EXIT_FAILURE);
510	pcg	1.1	}
511			}
512
513	pcg	1.13	#if ENABLE_ICMP
514	pcg	1.1	void
515	pcg	1.9	vpn::icmpv4_ev (io_watcher &w, short revents)
516	pcg	1.1	{
517	pcg	1.22	if (revents & EVENT_READ)
518	pcg	1.1	{
519			vpn_packet *pkt = new vpn_packet;
520			struct sockaddr_in sa;
521			socklen_t sa_len = sizeof (sa);
522			int len;
523
524	pcg	1.5	len = recvfrom (w.fd, &((pkt)[0]), MAXSIZE, 0, (sockaddr )&sa, &sa_len);
525	pcg	1.1
526	pcg	1.9	sockinfo si(sa, PROT_ICMPv4);
527	pcg	1.1
528			if (len > 0)
529			{
530			pkt->len = len;
531
532	pcg	1.14	icmp_header hdr = (icmp_header )&((*pkt)[IP_OVERHEAD]);
533	pcg	1.9
534			if (hdr->type == ::conf.icmp_type
535			&& hdr->code == 255)
536			{
537			// raw sockets deliver the ipv4, but don't expect it on sends
538			// this is slow, but...
539			pkt->skip_hdr (ICMP_OVERHEAD);
540
541			recv_vpn_packet (pkt, si);
542			}
543			}
544			else
545			{
546			// probably ECONNRESET or somesuch
547			slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno));
548			}
549
550			delete pkt;
551			}
552			else
553			{
554			slog (L_ERR,
555			_("FATAL: unknown revents %08x in socket, terminating\n"),
556			revents);
557	pcg	1.23	exit (EXIT_FAILURE);
558	pcg	1.9	}
559			}
560	pcg	1.13	#endif
561	pcg	1.9
562			void
563			vpn::udpv4_ev (io_watcher &w, short revents)
564			{
565	pcg	1.22	if (revents & EVENT_READ)
566	pcg	1.9	{
567			vpn_packet *pkt = new vpn_packet;
568			struct sockaddr_in sa;
569			socklen_t sa_len = sizeof (sa);
570			int len;
571
572			len = recvfrom (w.fd, &((pkt)[0]), MAXSIZE, 0, (sockaddr )&sa, &sa_len);
573
574			sockinfo si(sa, PROT_UDPv4);
575
576			if (len > 0)
577			{
578			pkt->len = len;
579	pcg	1.1
580			recv_vpn_packet (pkt, si);
581			}
582			else
583			{
584			// probably ECONNRESET or somesuch
585	pcg	1.9	slog (L_DEBUG, _("%s: fd %d, %s"), (const char *)si, w.fd, strerror (errno));
586	pcg	1.1	}
587
588			delete pkt;
589			}
590			else
591			{
592			slog (L_ERR,
593			_("FATAL: unknown revents %08x in socket, terminating\n"),
594			revents);
595	pcg	1.23	exit (EXIT_FAILURE);
596	pcg	1.1	}
597			}
598	pcg	1.2
599			void
600	pcg	1.3	vpn::tap_ev (io_watcher &w, short revents)
601	pcg	1.1	{
602	pcg	1.22	if (revents & EVENT_READ)
603	pcg	1.1	{
604			/* process data */
605			tap_packet *pkt;
606
607			pkt = tap->recv ();
608
609	pcg	1.17	if (!pkt)
610			return;
611	pcg	1.1
612	pcg	1.17	if (pkt->len > 14)
613	pcg	1.1	{
614	pcg	1.17	int dst = mac2id (pkt->dst);
615			int src = mac2id (pkt->src);
616	pcg	1.1
617	pcg	1.17	if (src != THISNODE->id)
618			{
619	pcg	1.30	slog (L_ERR, _("FATAL: tap packet not originating on current node received (if-up script not working properly?), exiting."));
620	pcg	1.23	exit (EXIT_FAILURE);
621	pcg	1.17	}
622	pcg	1.1
623	pcg	1.17	if (dst == THISNODE->id)
624	pcg	1.1	{
625	pcg	1.17	slog (L_ERR, _("FATAL: tap packet destined for current node received, exiting."));
626	pcg	1.23	exit (EXIT_FAILURE);
627	pcg	1.1	}
628	pcg	1.17
629			if (dst > conns.size ())
630			slog (L_ERR, _("tap packet for unknown node %d received, ignoring."), dst);
631	pcg	1.1	else
632	pcg	1.18	inject_data_packet (pkt, dst);
633	pcg	1.1	}
634
635			delete pkt;
636			}
637			else
638			abort ();
639			}
640
641			void
642	pcg	1.3	vpn::event_cb (time_watcher &w)
643	pcg	1.1	{
644			if (events)
645			{
646			if (events & EVENT_SHUTDOWN)
647			{
648			slog (L_INFO, _("preparing shutdown..."));
649
650			shutdown_all ();
651	pcg	1.24	remove_pid (conf.pidfilename);
652	pcg	1.1	slog (L_INFO, _("terminating"));
653	pcg	1.23	exit (EXIT_SUCCESS);
654	pcg	1.1	}
655
656			if (events & EVENT_RECONNECT)
657			{
658			slog (L_INFO, _("forced reconnect"));
659
660			reconnect_all ();
661			}
662
663			events = 0;
664			}
665			}
666
667			void
668			vpn::shutdown_all ()
669			{
670			for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)
671			(*c)->shutdown ();
672			}
673
674			void
675			vpn::reconnect_all ()
676			{
677			for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)
678			delete *c;
679
680			conns.clear ();
681
682			connection_init ();
683
684			for (configuration::node_vector::iterator i = conf.nodes.begin ();
685			i != conf.nodes.end (); ++i)
686			{
687	pcg	1.27	connection conn = new connection (this, i);
688	pcg	1.1	conns.push_back (conn);
689			conn->establish_connection ();
690			}
691			}
692
693			connection *vpn::find_router ()
694			{
695	pcg	1.26	u32 prio = 1;
696	pcg	1.1	connection *router = 0;
697
698			for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)
699			{
700			connection c = i;
701
702	pcg	1.13	if (c->conf->routerprio > prio
703	pcg	1.11	&& c->connectmode == conf_node::C_ALWAYS // so we don't drop the connection if in use
704			&& c->ictx && c->octx
705	pcg	1.13	&& c->conf != THISNODE) // redundant, since ictx==octx==0 always on thisnode
706	pcg	1.1	{
707			prio = c->conf->routerprio;
708			router = c;
709			}
710			}
711
712			return router;
713			}
714
715	pcg	1.7	void vpn::send_connect_request (int id)
716	pcg	1.1	{
717			connection *c = find_router ();
718
719			if (c)
720	pcg	1.7	c->send_connect_request (id);
721			else
722			// no router found, aggressively connect to all routers
723			for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)
724	pcg	1.13	if ((i)->conf->routerprio && (i)->conf != THISNODE)
725	pcg	1.7	(*i)->establish_connection ();
726	pcg	1.1	}
727
728			void
729			connection::dump_status ()
730			{
731			slog (L_NOTICE, _("node %s (id %d)"), conf->nodename, conf->id);
732			slog (L_NOTICE, _(" connectmode %d (%d) / sockaddr %s / minor %d"),
733			connectmode, conf->connectmode, (const char *)si, (int)prot_minor);
734			slog (L_NOTICE, _(" ictx/octx %08lx/%08lx / oseqno %d / retry_cnt %d"),
735			(long)ictx, (long)octx, (int)oseqno, (int)retry_cnt);
736			slog (L_NOTICE, _(" establish_conn %ld / rekey %ld / keepalive %ld"),
737			(long)(establish_connection.at), (long)(rekey.at), (long)(keepalive.at));
738			}
739
740			void
741			vpn::dump_status ()
742			{
743			slog (L_NOTICE, _("BEGIN status dump (%ld)"), (long)NOW);
744
745			for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)
746			(*c)->dump_status ();
747
748			slog (L_NOTICE, _("END status dump"));
749			}
750
751			vpn::vpn (void)
752	pcg	1.9	: event (this, &vpn::event_cb)
753			, udpv4_ev_watcher (this, &vpn::udpv4_ev)
754			, ipv4_ev_watcher (this, &vpn::ipv4_ev)
755	pcg	1.2	#if ENABLE_TCP
756	pcg	1.9	, tcpv4_ev_watcher (this, &vpn::tcpv4_ev)
757			#endif
758			#if ENABLE_ICMP
759			, icmpv4_ev_watcher(this, &vpn::icmpv4_ev)
760	pcg	1.24	#endif
761			#if ENABLE_DNS
762			, dnsv4_ev_watcher (this, &vpn::dnsv4_ev)
763	pcg	1.2	#endif
764	pcg	1.9	, tap_ev_watcher (this, &vpn::tap_ev)
765	pcg	1.1	{
766			}
767
768			vpn::~vpn ()
769			{
770			}
771