1 |
/* |
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vpn.C -- handle the protocol, encryption, handshaking etc. |
3 |
Copyright (C) 2003-2007 Marc Lehmann <gvpe@schmorp.de> |
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|
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This file is part of GVPE. |
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|
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GVPE is free software; you can redistribute it and/or modify |
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it under the terms of the GNU General Public License as published by |
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the Free Software Foundation; either version 2 of the License, or |
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(at your option) any later version. |
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|
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This program is distributed in the hope that it will be useful, |
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but WITHOUT ANY WARRANTY; without even the implied warranty of |
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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GNU General Public License for more details. |
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|
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You should have received a copy of the GNU General Public License |
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along with gvpe; if not, write to the Free Software |
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Foundation, Inc. 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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*/ |
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|
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#include "config.h" |
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|
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#include <list> |
25 |
|
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#include <cstdio> |
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#include <cstring> |
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#include <cstdlib> |
29 |
|
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#include <sys/types.h> |
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#include <sys/socket.h> |
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#include <sys/wait.h> |
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#include <errno.h> |
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#include <time.h> |
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#include <unistd.h> |
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#include <fcntl.h> |
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#include <sys/socket.h> |
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|
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#include "netcompat.h" |
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|
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#include "pidfile.h" |
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|
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#include "connection.h" |
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#include "util.h" |
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#include "vpn.h" |
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|
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vpn network; // THE vpn (bad design...) |
48 |
|
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///////////////////////////////////////////////////////////////////////////// |
50 |
|
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static void inline |
52 |
set_tos (int fd, int &tos_prev, int tos) |
53 |
{ |
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#if defined(SOL_IP) && defined(IP_TOS) |
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if (tos_prev == tos) |
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return; |
57 |
|
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tos_prev = tos; |
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setsockopt (fd, SOL_IP, IP_TOS, &tos, sizeof tos); |
60 |
#endif |
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} |
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|
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void |
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vpn::script_init_env () |
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{ |
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// the tunnel device mtu should be the physical mtu - overhead |
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// the tricky part is rounding to the cipher key blocksize |
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int mtu = conf.mtu - ETH_OVERHEAD - VPE_OVERHEAD - MAX_OVERHEAD; |
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mtu += ETH_OVERHEAD - 6 - 6; // now we have the data portion |
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mtu -= mtu % EVP_CIPHER_block_size (CIPHER); // round |
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mtu -= ETH_OVERHEAD - 6 - 6; // and get interface mtu again |
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|
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char *env; |
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asprintf (&env, "CONFBASE=%s", confbase); putenv (env); |
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asprintf (&env, "IFNAME=%s", tap->interface ()); putenv (env); |
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asprintf (&env, "IFTYPE=%s", IFTYPE); putenv (env); |
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asprintf (&env, "IFSUBTYPE=%s", IFSUBTYPE); putenv (env); |
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asprintf (&env, "MTU=%d", mtu); putenv (env); |
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asprintf (&env, "NODES=%d", conns.size ()); putenv (env); |
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asprintf (&env, "NODEID=%d", THISNODE->id); putenv (env); |
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|
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conns [THISNODE->id - 1]->script_init_env (""); |
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|
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for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c) |
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{ |
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char ext[16]; |
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snprintf (ext, 16, "_%d", (*c)->conf->id); |
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(*c)->script_init_env (ext); |
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} |
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} |
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|
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const char *vpn::script_if_init () |
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{ |
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script_init_env (); |
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|
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return tap->if_up (); |
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} |
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|
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const char *vpn::script_if_up () |
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{ |
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script_init_env (); |
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|
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char *filename; |
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asprintf (&filename, |
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"%s/%s", |
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confbase, |
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::conf.script_if_up ? ::conf.script_if_up : "if-up"); |
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|
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return filename; |
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} |
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|
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int |
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vpn::setup () |
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{ |
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ipv4_tos = -1; |
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ipv4_fd = -1; |
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|
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if (THISNODE->protocols & PROT_IPv4 && ::conf.ip_proto) |
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{ |
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ipv4_fd = socket (PF_INET, SOCK_RAW, ::conf.ip_proto); |
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|
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if (ipv4_fd < 0) |
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return -1; |
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|
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fcntl (ipv4_fd, F_SETFL, O_NONBLOCK); |
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fcntl (ipv4_fd, F_SETFD, FD_CLOEXEC); |
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|
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#if defined(SOL_IP) && defined(IP_MTU_DISCOVER) |
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// this I really consider a linux bug. I am neither connected |
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// nor do I fragment myself. Linux still sets DF and doesn't |
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// fragment for me sometimes. |
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{ |
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int oval = IP_PMTUDISC_DONT; |
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setsockopt (ipv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval); |
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} |
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#endif |
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|
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sockinfo si (THISNODE, PROT_IPv4); |
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|
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if (bind (ipv4_fd, si.sav4 (), si.salenv4 ())) |
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{ |
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slog (L_ERR, _("can't bind ipv4 socket on %s: %s"), (const char *)si, strerror (errno)); |
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exit (EXIT_FAILURE); |
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} |
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|
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ipv4_ev_watcher.start (ipv4_fd, EV_READ); |
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} |
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|
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udpv4_tos = -1; |
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udpv4_fd = -1; |
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|
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if (THISNODE->protocols & PROT_UDPv4 && THISNODE->udp_port) |
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{ |
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udpv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP); |
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|
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if (udpv4_fd < 0) |
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return -1; |
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|
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fcntl (udpv4_fd, F_SETFL, O_NONBLOCK); |
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fcntl (udpv4_fd, F_SETFD, FD_CLOEXEC); |
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|
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// standard daemon practise... |
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{ |
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int oval = 1; |
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setsockopt (udpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval); |
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} |
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|
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#if defined(SOL_IP) && defined(IP_MTU_DISCOVER) |
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// this I really consider a linux bug. I am neither connected |
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// nor do I fragment myself. Linux still sets DF and doesn't |
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// fragment for me sometimes. |
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{ |
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int oval = IP_PMTUDISC_DONT; |
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setsockopt (udpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval); |
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} |
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#endif |
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|
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sockinfo si (THISNODE, PROT_UDPv4); |
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|
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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)); |
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exit (EXIT_FAILURE); |
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} |
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|
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udpv4_ev_watcher.start (udpv4_fd, EV_READ); |
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} |
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|
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icmpv4_tos = -1; |
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icmpv4_fd = -1; |
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|
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#if ENABLE_ICMP |
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if (THISNODE->protocols & PROT_ICMPv4) |
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{ |
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icmpv4_fd = socket (PF_INET, SOCK_RAW, IPPROTO_ICMP); |
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|
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if (icmpv4_fd < 0) |
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return -1; |
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|
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fcntl (icmpv4_fd, F_SETFL, O_NONBLOCK); |
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fcntl (icmpv4_fd, F_SETFD, FD_CLOEXEC); |
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|
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#ifdef ICMP_FILTER |
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{ |
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icmp_filter oval; |
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oval.data = 0xffffffff; |
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if (::conf.icmp_type < 32) |
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oval.data &= ~(1 << ::conf.icmp_type); |
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|
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setsockopt (icmpv4_fd, SOL_RAW, ICMP_FILTER, &oval, sizeof oval); |
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} |
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#endif |
213 |
|
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#if defined(SOL_IP) && defined(IP_MTU_DISCOVER) |
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// 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. |
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{ |
219 |
int oval = IP_PMTUDISC_DONT; |
220 |
setsockopt (icmpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval); |
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} |
222 |
#endif |
223 |
|
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sockinfo si (THISNODE, PROT_ICMPv4); |
225 |
|
226 |
if (bind (icmpv4_fd, si.sav4 (), si.salenv4 ())) |
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{ |
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slog (L_ERR, _("can't bind icmpv4 on %s: %s"), (const char *)si, strerror (errno)); |
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exit (EXIT_FAILURE); |
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} |
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|
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icmpv4_ev_watcher.start (icmpv4_fd, EV_READ); |
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} |
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#endif |
235 |
|
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tcpv4_fd = -1; |
237 |
|
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#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 |
|
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fcntl (tcpv4_fd, F_SETFL, O_NONBLOCK); |
247 |
fcntl (tcpv4_fd, F_SETFD, FD_CLOEXEC); |
248 |
|
249 |
// standard daemon practise... |
250 |
{ |
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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 |
run_script_cb cb; |
335 |
|
336 |
callback_set (cb, this, vpn, script_if_init); |
337 |
if (tap->if_up () && |
338 |
!run_script (cb, true)) |
339 |
{ |
340 |
slog (L_ERR, _("interface initialization command '%s' failed, exiting."), |
341 |
tap->if_up ()); |
342 |
exit (EXIT_FAILURE); |
343 |
} |
344 |
|
345 |
callback_set (cb, this, vpn, script_if_up); |
346 |
if (!run_script (cb, true)) |
347 |
{ |
348 |
slog (L_ERR, _("if-up command execution failed, exiting.")); |
349 |
exit (EXIT_FAILURE); |
350 |
} |
351 |
|
352 |
tap_ev_watcher.start (tap->fd, EV_READ); |
353 |
|
354 |
return 0; |
355 |
} |
356 |
|
357 |
bool |
358 |
vpn::send_ipv4_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
359 |
{ |
360 |
set_tos (ipv4_fd, ipv4_tos, tos); |
361 |
sendto (ipv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ()); |
362 |
|
363 |
return true; |
364 |
} |
365 |
|
366 |
static u16 |
367 |
ipv4_checksum (u16 *data, unsigned int len) |
368 |
{ |
369 |
// use 32 bit accumulator and fold back carry bits at the end |
370 |
u32 sum = 0; |
371 |
|
372 |
while (len > 1) |
373 |
{ |
374 |
sum += *data++; |
375 |
len -= 2; |
376 |
} |
377 |
|
378 |
// odd byte left? |
379 |
if (len) |
380 |
sum += *(u8 *)data; |
381 |
|
382 |
// add back carry bits |
383 |
sum = (sum >> 16) + (sum & 0xffff); // lo += hi |
384 |
sum += (sum >> 16); // carry |
385 |
|
386 |
return ~sum; |
387 |
} |
388 |
|
389 |
#if ENABLE_ICMP |
390 |
bool |
391 |
vpn::send_icmpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
392 |
{ |
393 |
pkt->unshift_hdr (4); |
394 |
|
395 |
icmp_header *hdr = (icmp_header *)&((*pkt)[0]); |
396 |
hdr->type = ::conf.icmp_type; |
397 |
hdr->code = 255; |
398 |
hdr->checksum = 0; |
399 |
hdr->checksum = ipv4_checksum ((u16 *)hdr, pkt->len); |
400 |
|
401 |
set_tos (icmpv4_fd, icmpv4_tos, tos); |
402 |
sendto (icmpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ()); |
403 |
|
404 |
return true; |
405 |
} |
406 |
#endif |
407 |
|
408 |
bool |
409 |
vpn::send_udpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
410 |
{ |
411 |
set_tos (udpv4_fd, udpv4_tos, tos); |
412 |
sendto (udpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ()); |
413 |
|
414 |
return true; |
415 |
} |
416 |
|
417 |
void |
418 |
vpn::inject_data_packet (tap_packet *pkt, int dst) |
419 |
{ |
420 |
if (dst) |
421 |
{ |
422 |
// unicast |
423 |
if (dst != THISNODE->id) |
424 |
conns[dst - 1]->inject_data_packet (pkt); |
425 |
} |
426 |
else |
427 |
{ |
428 |
// broadcast, this is ugly, but due to the security policy |
429 |
// we have to connect to all hosts... |
430 |
for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c) |
431 |
if ((*c)->conf != THISNODE) |
432 |
(*c)->inject_data_packet (pkt, true); |
433 |
} |
434 |
} |
435 |
|
436 |
void |
437 |
vpn::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi) |
438 |
{ |
439 |
unsigned int src = pkt->src (); |
440 |
unsigned int dst = pkt->dst (); |
441 |
|
442 |
slog (L_NOISE, _("<<?/%s received possible vpn packet type %d from %d to %d, length %d"), |
443 |
(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst (), pkt->len); |
444 |
|
445 |
if (src == 0 || src > conns.size () |
446 |
|| dst > conns.size () |
447 |
|| pkt->typ () >= vpn_packet::PT_MAX) |
448 |
slog (L_WARN, _("(%s): received corrupted packet type %d (src %d, dst %d)"), |
449 |
(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ()); |
450 |
else if (dst > conns.size ()) |
451 |
slog (L_WARN, _("(%s): received corrupted packet type %d (src %d, dst %d)"), |
452 |
(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ()); |
453 |
else |
454 |
{ |
455 |
connection *c = conns[src - 1]; |
456 |
|
457 |
if (dst == 0) |
458 |
slog (L_WARN, _("%s(%s): received broadcast (protocol violation)"), |
459 |
c->conf->nodename, (const char *)rsi); |
460 |
else if (dst != THISNODE->id) |
461 |
{ |
462 |
if (THISNODE->routerprio) |
463 |
// the tos setting gets lost here. who cares. |
464 |
conns[dst - 1]->inject_vpn_packet (pkt); |
465 |
else |
466 |
slog (L_WARN, |
467 |
_("%s(%s): forwarding request (=> %s), but we are no router"), |
468 |
c->conf->nodename, (const char *)rsi, |
469 |
conns[dst - 1]->conf->nodename); |
470 |
} |
471 |
else |
472 |
c->recv_vpn_packet (pkt, rsi); |
473 |
} |
474 |
} |
475 |
|
476 |
bool |
477 |
vpn::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
478 |
{ |
479 |
switch (si.prot) |
480 |
{ |
481 |
case PROT_IPv4: |
482 |
return send_ipv4_packet (pkt, si, tos); |
483 |
|
484 |
case PROT_UDPv4: |
485 |
return send_udpv4_packet (pkt, si, tos); |
486 |
|
487 |
#if ENABLE_TCP |
488 |
case PROT_TCPv4: |
489 |
return send_tcpv4_packet (pkt, si, tos); |
490 |
#endif |
491 |
#if ENABLE_ICMP |
492 |
case PROT_ICMPv4: |
493 |
return send_icmpv4_packet (pkt, si, tos); |
494 |
#endif |
495 |
#if ENABLE_DNS |
496 |
case PROT_DNSv4: |
497 |
return send_dnsv4_packet (pkt, si, tos); |
498 |
#endif |
499 |
default: |
500 |
slog (L_CRIT, _("%s: FATAL: trying to send packet with unsupported protocol"), (const char *)si); |
501 |
} |
502 |
|
503 |
return false; |
504 |
} |
505 |
|
506 |
void |
507 |
vpn::ipv4_ev (ev::io &w, int revents) |
508 |
{ |
509 |
if (revents & EV_READ) |
510 |
{ |
511 |
vpn_packet *pkt = new vpn_packet; |
512 |
struct sockaddr_in sa; |
513 |
socklen_t sa_len = sizeof (sa); |
514 |
int len; |
515 |
|
516 |
len = recvfrom (w.fd, &((*pkt)[0]), MAXSIZE, 0, (sockaddr *)&sa, &sa_len); |
517 |
|
518 |
sockinfo si(sa, PROT_IPv4); |
519 |
|
520 |
if (len > 0) |
521 |
{ |
522 |
pkt->len = len; |
523 |
|
524 |
// raw sockets deliver the ipv4 header, but don't expect it on sends |
525 |
pkt->skip_hdr (IP_OVERHEAD); |
526 |
|
527 |
recv_vpn_packet (pkt, si); |
528 |
} |
529 |
else |
530 |
{ |
531 |
// probably ECONNRESET or somesuch |
532 |
slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno)); |
533 |
} |
534 |
|
535 |
delete pkt; |
536 |
} |
537 |
else |
538 |
{ |
539 |
slog (L_ERR, |
540 |
_("FATAL: unknown revents %08x in socket, terminating\n"), |
541 |
revents); |
542 |
exit (EXIT_FAILURE); |
543 |
} |
544 |
} |
545 |
|
546 |
#if ENABLE_ICMP |
547 |
void |
548 |
vpn::icmpv4_ev (ev::io &w, int revents) |
549 |
{ |
550 |
if (revents & EV_READ) |
551 |
{ |
552 |
vpn_packet *pkt = new vpn_packet; |
553 |
struct sockaddr_in sa; |
554 |
socklen_t sa_len = sizeof (sa); |
555 |
int len; |
556 |
|
557 |
len = recvfrom (w.fd, &((*pkt)[0]), MAXSIZE, 0, (sockaddr *)&sa, &sa_len); |
558 |
|
559 |
sockinfo si(sa, PROT_ICMPv4); |
560 |
|
561 |
if (len > 0) |
562 |
{ |
563 |
pkt->len = len; |
564 |
|
565 |
icmp_header *hdr = (icmp_header *)&((*pkt)[IP_OVERHEAD]); |
566 |
|
567 |
if (hdr->type == ::conf.icmp_type |
568 |
&& hdr->code == 255) |
569 |
{ |
570 |
// raw sockets deliver the ipv4, but don't expect it on sends |
571 |
// this is slow, but... |
572 |
pkt->skip_hdr (ICMP_OVERHEAD); |
573 |
|
574 |
recv_vpn_packet (pkt, si); |
575 |
} |
576 |
} |
577 |
else |
578 |
{ |
579 |
// probably ECONNRESET or somesuch |
580 |
slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno)); |
581 |
} |
582 |
|
583 |
delete pkt; |
584 |
} |
585 |
else |
586 |
{ |
587 |
slog (L_ERR, |
588 |
_("FATAL: unknown revents %08x in socket, terminating\n"), |
589 |
revents); |
590 |
exit (EXIT_FAILURE); |
591 |
} |
592 |
} |
593 |
#endif |
594 |
|
595 |
void |
596 |
vpn::udpv4_ev (ev::io &w, int revents) |
597 |
{ |
598 |
if (revents & EV_READ) |
599 |
{ |
600 |
vpn_packet *pkt = new vpn_packet; |
601 |
struct sockaddr_in sa; |
602 |
socklen_t sa_len = sizeof (sa); |
603 |
int len; |
604 |
|
605 |
len = recvfrom (w.fd, &((*pkt)[0]), MAXSIZE, 0, (sockaddr *)&sa, &sa_len); |
606 |
|
607 |
sockinfo si(sa, PROT_UDPv4); |
608 |
|
609 |
if (len > 0) |
610 |
{ |
611 |
pkt->len = len; |
612 |
|
613 |
recv_vpn_packet (pkt, si); |
614 |
} |
615 |
else |
616 |
{ |
617 |
// probably ECONNRESET or somesuch |
618 |
slog (L_DEBUG, _("%s: fd %d, %s"), (const char *)si, w.fd, strerror (errno)); |
619 |
} |
620 |
|
621 |
delete pkt; |
622 |
} |
623 |
else |
624 |
{ |
625 |
slog (L_ERR, |
626 |
_("FATAL: unknown revents %08x in socket, terminating\n"), |
627 |
revents); |
628 |
exit (EXIT_FAILURE); |
629 |
} |
630 |
} |
631 |
|
632 |
void |
633 |
vpn::tap_ev (ev::io &w, int revents) |
634 |
{ |
635 |
if (revents & EV_READ) |
636 |
{ |
637 |
/* process data */ |
638 |
tap_packet *pkt; |
639 |
|
640 |
pkt = tap->recv (); |
641 |
|
642 |
if (!pkt) |
643 |
return; |
644 |
|
645 |
if (pkt->len > 14) |
646 |
{ |
647 |
int dst = mac2id (pkt->dst); |
648 |
int src = mac2id (pkt->src); |
649 |
|
650 |
if (src != THISNODE->id) |
651 |
{ |
652 |
slog (L_ERR, _("FATAL: tap packet not originating on current node received (if-up script not working properly?), exiting.")); |
653 |
exit (EXIT_FAILURE); |
654 |
} |
655 |
|
656 |
if (dst == THISNODE->id) |
657 |
{ |
658 |
slog (L_ERR, _("FATAL: tap packet destined for current node received, exiting.")); |
659 |
exit (EXIT_FAILURE); |
660 |
} |
661 |
|
662 |
if (dst > conns.size ()) |
663 |
slog (L_ERR, _("tap packet for unknown node %d received, ignoring."), dst); |
664 |
else |
665 |
inject_data_packet (pkt, dst); |
666 |
} |
667 |
|
668 |
delete pkt; |
669 |
} |
670 |
else |
671 |
abort (); |
672 |
} |
673 |
|
674 |
void |
675 |
vpn::event_cb (ev::timer &w, int) |
676 |
{ |
677 |
if (events) |
678 |
{ |
679 |
if (events & EVENT_SHUTDOWN) |
680 |
{ |
681 |
slog (L_INFO, _("preparing shutdown...")); |
682 |
|
683 |
shutdown_all (); |
684 |
remove_pid (conf.pidfilename); |
685 |
slog (L_INFO, _("terminating")); |
686 |
exit (EXIT_SUCCESS); |
687 |
} |
688 |
|
689 |
if (events & EVENT_RECONNECT) |
690 |
{ |
691 |
slog (L_INFO, _("forced reconnect")); |
692 |
|
693 |
reconnect_all (); |
694 |
} |
695 |
|
696 |
events = 0; |
697 |
} |
698 |
} |
699 |
|
700 |
void |
701 |
vpn::shutdown_all () |
702 |
{ |
703 |
for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c) |
704 |
(*c)->shutdown (); |
705 |
} |
706 |
|
707 |
void |
708 |
vpn::reconnect_all () |
709 |
{ |
710 |
for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c) |
711 |
delete *c; |
712 |
|
713 |
conns.clear (); |
714 |
|
715 |
connection_init (); |
716 |
|
717 |
for (configuration::node_vector::iterator i = conf.nodes.begin (); |
718 |
i != conf.nodes.end (); ++i) |
719 |
{ |
720 |
connection *conn = new connection (this, *i); |
721 |
conns.push_back (conn); |
722 |
conn->establish_connection (); |
723 |
} |
724 |
} |
725 |
|
726 |
connection *vpn::find_router () |
727 |
{ |
728 |
u32 prio = 1; |
729 |
connection *router = 0; |
730 |
|
731 |
for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i) |
732 |
{ |
733 |
connection *c = *i; |
734 |
|
735 |
if (c->conf->routerprio > prio |
736 |
&& c->connectmode == conf_node::C_ALWAYS // so we don't drop the connection if in use |
737 |
&& c->ictx && c->octx |
738 |
&& c->conf != THISNODE) // redundant, since ictx==octx==0 always on thisnode |
739 |
{ |
740 |
prio = c->conf->routerprio; |
741 |
router = c; |
742 |
} |
743 |
} |
744 |
|
745 |
return router; |
746 |
} |
747 |
|
748 |
void vpn::send_connect_request (int id) |
749 |
{ |
750 |
connection *c = find_router (); |
751 |
|
752 |
if (c) |
753 |
c->send_connect_request (id); |
754 |
else |
755 |
// no router found, aggressively connect to all routers |
756 |
for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i) |
757 |
if ((*i)->conf->routerprio && (*i)->conf != THISNODE) |
758 |
(*i)->establish_connection (); |
759 |
} |
760 |
|
761 |
void |
762 |
connection::dump_status () |
763 |
{ |
764 |
slog (L_NOTICE, _("node %s (id %d)"), conf->nodename, conf->id); |
765 |
slog (L_NOTICE, _(" connectmode %d (%d) / sockaddr %s / minor %d"), |
766 |
connectmode, conf->connectmode, (const char *)si, (int)prot_minor); |
767 |
slog (L_NOTICE, _(" ictx/octx %08lx/%08lx / oseqno %d / retry_cnt %d"), |
768 |
(long)ictx, (long)octx, (int)oseqno, (int)retry_cnt); |
769 |
slog (L_NOTICE, _(" establish_conn %ld / rekey %ld / keepalive %ld"), |
770 |
(long)(establish_connection.at), (long)(rekey.at), (long)(keepalive.at)); |
771 |
} |
772 |
|
773 |
void |
774 |
vpn::dump_status () |
775 |
{ |
776 |
slog (L_NOTICE, _("BEGIN status dump (%ld)"), (long)ev_now ()); |
777 |
|
778 |
for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c) |
779 |
(*c)->dump_status (); |
780 |
|
781 |
slog (L_NOTICE, _("END status dump")); |
782 |
} |
783 |
|
784 |
vpn::vpn (void) |
785 |
: event (this, &vpn::event_cb) |
786 |
, udpv4_ev_watcher (this, &vpn::udpv4_ev) |
787 |
, ipv4_ev_watcher (this, &vpn::ipv4_ev) |
788 |
#if ENABLE_TCP |
789 |
, tcpv4_ev_watcher (this, &vpn::tcpv4_ev) |
790 |
#endif |
791 |
#if ENABLE_ICMP |
792 |
, icmpv4_ev_watcher(this, &vpn::icmpv4_ev) |
793 |
#endif |
794 |
#if ENABLE_DNS |
795 |
, dnsv4_ev_watcher (this, &vpn::dnsv4_ev) |
796 |
#endif |
797 |
, tap_ev_watcher (this, &vpn::tap_ev) |
798 |
{ |
799 |
} |
800 |
|
801 |
vpn::~vpn () |
802 |
{ |
803 |
} |
804 |
|