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> |
38 |
|
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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) |
55 |
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 () |
65 |
{ |
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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 |
72 |
|
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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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inline const char * |
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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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inline const char * |
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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 |
215 |
|
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#if defined(SOL_IP) && defined(IP_MTU_DISCOVER) |
217 |
// this I really consider a linux bug. I am neither connected |
218 |
// nor do I fragment myself. Linux still sets DF and doesn't |
219 |
// fragment for me sometimes. |
220 |
{ |
221 |
int oval = IP_PMTUDISC_DONT; |
222 |
setsockopt (icmpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval); |
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} |
224 |
#endif |
225 |
|
226 |
sockinfo si (THISNODE, PROT_ICMPv4); |
227 |
|
228 |
if (bind (icmpv4_fd, si.sav4 (), si.salenv4 ())) |
229 |
{ |
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slog (L_ERR, _("can't bind icmpv4 on %s: %s"), (const char *)si, strerror (errno)); |
231 |
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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} |
236 |
#endif |
237 |
|
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tcpv4_fd = -1; |
239 |
|
240 |
#if ENABLE_TCP |
241 |
if (THISNODE->protocols & PROT_TCPv4 && THISNODE->tcp_port) |
242 |
{ |
243 |
tcpv4_fd = socket (PF_INET, SOCK_STREAM, IPPROTO_TCP); |
244 |
|
245 |
if (tcpv4_fd < 0) |
246 |
return -1; |
247 |
|
248 |
fcntl (tcpv4_fd, F_SETFL, O_NONBLOCK); |
249 |
fcntl (tcpv4_fd, F_SETFD, FD_CLOEXEC); |
250 |
|
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// standard daemon practise... |
252 |
{ |
253 |
int oval = 1; |
254 |
setsockopt (tcpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval); |
255 |
} |
256 |
|
257 |
sockinfo si (THISNODE, PROT_TCPv4); |
258 |
|
259 |
if (bind (tcpv4_fd, si.sav4 (), si.salenv4 ())) |
260 |
{ |
261 |
slog (L_ERR, _("can't bind tcpv4 on %s: %s"), (const char *)si, strerror (errno)); |
262 |
exit (EXIT_FAILURE); |
263 |
} |
264 |
|
265 |
if (listen (tcpv4_fd, 5)) |
266 |
{ |
267 |
slog (L_ERR, _("can't listen tcpv4 on %s: %s"), (const char *)si, strerror (errno)); |
268 |
exit (EXIT_FAILURE); |
269 |
} |
270 |
|
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tcpv4_ev_watcher.start (tcpv4_fd, EV_READ); |
272 |
} |
273 |
#endif |
274 |
|
275 |
dnsv4_tos = -1; |
276 |
dnsv4_fd = -1; |
277 |
|
278 |
#if ENABLE_DNS |
279 |
if (THISNODE->protocols & PROT_DNSv4) |
280 |
{ |
281 |
dns_forwarder.set (::conf.dns_forw_host, ::conf.dns_forw_port, PROT_DNSv4); |
282 |
|
283 |
dnsv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP); |
284 |
|
285 |
if (dnsv4_fd < 0) |
286 |
return -1; |
287 |
|
288 |
fcntl (dnsv4_fd, F_SETFL, O_NONBLOCK); |
289 |
fcntl (dnsv4_fd, F_SETFD, FD_CLOEXEC); |
290 |
|
291 |
# if defined(SOL_IP) && defined(IP_MTU_DISCOVER) |
292 |
// this I really consider a linux bug. I am neither connected |
293 |
// nor do I fragment myself. Linux still sets DF and doesn't |
294 |
// fragment for me sometimes. |
295 |
{ |
296 |
int oval = IP_PMTUDISC_DONT; |
297 |
setsockopt (dnsv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval); |
298 |
} |
299 |
# endif |
300 |
|
301 |
// standard daemon practise... |
302 |
{ |
303 |
int oval = 1; |
304 |
setsockopt (dnsv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval); |
305 |
} |
306 |
|
307 |
sockinfo si (THISNODE->dns_hostname, |
308 |
THISNODE->dns_hostname ? THISNODE->dns_port : 0, |
309 |
PROT_DNSv4); |
310 |
|
311 |
if (bind (dnsv4_fd, si.sav4 (), si.salenv4 ())) |
312 |
{ |
313 |
slog (L_ERR, _("can't bind dnsv4 on %s: %s"), (const char *)si, strerror (errno)); |
314 |
exit (EXIT_FAILURE); |
315 |
} |
316 |
|
317 |
dnsv4_ev_watcher.start (dnsv4_fd, EV_READ); |
318 |
} |
319 |
#endif |
320 |
|
321 |
///////////////////////////////////////////////////////////////////////////// |
322 |
|
323 |
reconnect_all (); |
324 |
|
325 |
///////////////////////////////////////////////////////////////////////////// |
326 |
|
327 |
tap = new tap_device (); |
328 |
if (!tap) //D this, of course, never catches |
329 |
{ |
330 |
slog (L_ERR, _("cannot create network interface '%s'"), conf.ifname); |
331 |
exit (EXIT_FAILURE); |
332 |
} |
333 |
|
334 |
fcntl (tap->fd, F_SETFD, FD_CLOEXEC); |
335 |
|
336 |
run_script_cb cb; |
337 |
cb.set<vpn, &vpn::script_if_init> (this); |
338 |
|
339 |
if (tap->if_up () && |
340 |
!run_script (cb, true)) |
341 |
{ |
342 |
slog (L_ERR, _("interface initialization command '%s' failed, exiting."), |
343 |
tap->if_up ()); |
344 |
exit (EXIT_FAILURE); |
345 |
} |
346 |
|
347 |
cb.set<vpn, &vpn::script_if_up> (this); |
348 |
if (!run_script (cb, true)) |
349 |
{ |
350 |
slog (L_ERR, _("if-up command execution failed, exiting.")); |
351 |
exit (EXIT_FAILURE); |
352 |
} |
353 |
|
354 |
tap_ev_watcher.start (tap->fd, EV_READ); |
355 |
|
356 |
return 0; |
357 |
} |
358 |
|
359 |
bool |
360 |
vpn::send_ipv4_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
361 |
{ |
362 |
set_tos (ipv4_fd, ipv4_tos, tos); |
363 |
sendto (ipv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ()); |
364 |
|
365 |
return true; |
366 |
} |
367 |
|
368 |
static u16 |
369 |
ipv4_checksum (u16 *data, unsigned int len) |
370 |
{ |
371 |
// use 32 bit accumulator and fold back carry bits at the end |
372 |
u32 sum = 0; |
373 |
|
374 |
while (len > 1) |
375 |
{ |
376 |
sum += *data++; |
377 |
len -= 2; |
378 |
} |
379 |
|
380 |
// odd byte left? |
381 |
if (len) |
382 |
sum += *(u8 *)data; |
383 |
|
384 |
// add back carry bits |
385 |
sum = (sum >> 16) + (sum & 0xffff); // lo += hi |
386 |
sum += (sum >> 16); // carry |
387 |
|
388 |
return ~sum; |
389 |
} |
390 |
|
391 |
#if ENABLE_ICMP |
392 |
bool |
393 |
vpn::send_icmpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
394 |
{ |
395 |
pkt->unshift_hdr (4); |
396 |
|
397 |
icmp_header *hdr = (icmp_header *)&((*pkt)[0]); |
398 |
hdr->type = ::conf.icmp_type; |
399 |
hdr->code = 255; |
400 |
hdr->checksum = 0; |
401 |
hdr->checksum = ipv4_checksum ((u16 *)hdr, pkt->len); |
402 |
|
403 |
set_tos (icmpv4_fd, icmpv4_tos, tos); |
404 |
sendto (icmpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ()); |
405 |
|
406 |
return true; |
407 |
} |
408 |
#endif |
409 |
|
410 |
bool |
411 |
vpn::send_udpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
412 |
{ |
413 |
set_tos (udpv4_fd, udpv4_tos, tos); |
414 |
sendto (udpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ()); |
415 |
|
416 |
return true; |
417 |
} |
418 |
|
419 |
void |
420 |
vpn::inject_data_packet (tap_packet *pkt, int dst) |
421 |
{ |
422 |
if (dst) |
423 |
{ |
424 |
// unicast |
425 |
if (dst != THISNODE->id) |
426 |
conns[dst - 1]->inject_data_packet (pkt); |
427 |
} |
428 |
else |
429 |
{ |
430 |
// broadcast, this is ugly, but due to the security policy |
431 |
// we have to connect to all hosts... |
432 |
for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c) |
433 |
if ((*c)->conf != THISNODE) |
434 |
(*c)->inject_data_packet (pkt, true); |
435 |
} |
436 |
} |
437 |
|
438 |
void |
439 |
vpn::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi) |
440 |
{ |
441 |
unsigned int src = pkt->src (); |
442 |
unsigned int dst = pkt->dst (); |
443 |
|
444 |
slog (L_NOISE, _("<<?/%s received possible vpn packet type %d from %d to %d, length %d"), |
445 |
(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst (), pkt->len); |
446 |
|
447 |
if (src == 0 || src > conns.size () |
448 |
|| dst > conns.size () |
449 |
|| pkt->typ () >= vpn_packet::PT_MAX) |
450 |
slog (L_WARN, _("(%s): received corrupted packet type %d (src %d, dst %d)"), |
451 |
(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ()); |
452 |
else if (dst > conns.size ()) |
453 |
slog (L_WARN, _("(%s): received corrupted packet type %d (src %d, dst %d)"), |
454 |
(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ()); |
455 |
else |
456 |
{ |
457 |
connection *c = conns[src - 1]; |
458 |
|
459 |
if (dst == 0) |
460 |
slog (L_WARN, _("%s(%s): received broadcast (protocol violation)"), |
461 |
c->conf->nodename, (const char *)rsi); |
462 |
else if (dst != THISNODE->id) |
463 |
{ |
464 |
if (THISNODE->routerprio) |
465 |
// the tos setting gets lost here. who cares. |
466 |
conns[dst - 1]->inject_vpn_packet (pkt); |
467 |
else |
468 |
slog (L_WARN, |
469 |
_("%s(%s): forwarding request (=> %s), but we are no router"), |
470 |
c->conf->nodename, (const char *)rsi, |
471 |
conns[dst - 1]->conf->nodename); |
472 |
} |
473 |
else |
474 |
c->recv_vpn_packet (pkt, rsi); |
475 |
} |
476 |
} |
477 |
|
478 |
bool |
479 |
vpn::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
480 |
{ |
481 |
switch (si.prot) |
482 |
{ |
483 |
case PROT_IPv4: |
484 |
return send_ipv4_packet (pkt, si, tos); |
485 |
|
486 |
case PROT_UDPv4: |
487 |
return send_udpv4_packet (pkt, si, tos); |
488 |
|
489 |
#if ENABLE_TCP |
490 |
case PROT_TCPv4: |
491 |
return send_tcpv4_packet (pkt, si, tos); |
492 |
#endif |
493 |
#if ENABLE_ICMP |
494 |
case PROT_ICMPv4: |
495 |
return send_icmpv4_packet (pkt, si, tos); |
496 |
#endif |
497 |
#if ENABLE_DNS |
498 |
case PROT_DNSv4: |
499 |
return send_dnsv4_packet (pkt, si, tos); |
500 |
#endif |
501 |
default: |
502 |
slog (L_CRIT, _("%s: FATAL: trying to send packet with unsupported protocol"), (const char *)si); |
503 |
} |
504 |
|
505 |
return false; |
506 |
} |
507 |
|
508 |
inline void |
509 |
vpn::ipv4_ev (ev::io &w, int revents) |
510 |
{ |
511 |
if (revents & EV_READ) |
512 |
{ |
513 |
vpn_packet *pkt = new vpn_packet; |
514 |
struct sockaddr_in sa; |
515 |
socklen_t sa_len = sizeof (sa); |
516 |
int len; |
517 |
|
518 |
len = recvfrom (w.fd, &((*pkt)[0]), MAXSIZE, 0, (sockaddr *)&sa, &sa_len); |
519 |
|
520 |
sockinfo si(sa, PROT_IPv4); |
521 |
|
522 |
if (len > 0) |
523 |
{ |
524 |
pkt->len = len; |
525 |
|
526 |
// raw sockets deliver the ipv4 header, but don't expect it on sends |
527 |
pkt->skip_hdr (IP_OVERHEAD); |
528 |
|
529 |
recv_vpn_packet (pkt, si); |
530 |
} |
531 |
else |
532 |
{ |
533 |
// probably ECONNRESET or somesuch |
534 |
slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno)); |
535 |
} |
536 |
|
537 |
delete pkt; |
538 |
} |
539 |
else |
540 |
{ |
541 |
slog (L_ERR, |
542 |
_("FATAL: unknown revents %08x in socket, terminating\n"), |
543 |
revents); |
544 |
exit (EXIT_FAILURE); |
545 |
} |
546 |
} |
547 |
|
548 |
#if ENABLE_ICMP |
549 |
inline void |
550 |
vpn::icmpv4_ev (ev::io &w, int revents) |
551 |
{ |
552 |
if (revents & EV_READ) |
553 |
{ |
554 |
vpn_packet *pkt = new vpn_packet; |
555 |
struct sockaddr_in sa; |
556 |
socklen_t sa_len = sizeof (sa); |
557 |
int len; |
558 |
|
559 |
len = recvfrom (w.fd, &((*pkt)[0]), MAXSIZE, 0, (sockaddr *)&sa, &sa_len); |
560 |
|
561 |
sockinfo si(sa, PROT_ICMPv4); |
562 |
|
563 |
if (len > 0) |
564 |
{ |
565 |
pkt->len = len; |
566 |
|
567 |
icmp_header *hdr = (icmp_header *)&((*pkt)[IP_OVERHEAD]); |
568 |
|
569 |
if (hdr->type == ::conf.icmp_type |
570 |
&& hdr->code == 255) |
571 |
{ |
572 |
// raw sockets deliver the ipv4, but don't expect it on sends |
573 |
// this is slow, but... |
574 |
pkt->skip_hdr (ICMP_OVERHEAD); |
575 |
|
576 |
recv_vpn_packet (pkt, si); |
577 |
} |
578 |
} |
579 |
else |
580 |
{ |
581 |
// probably ECONNRESET or somesuch |
582 |
slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno)); |
583 |
} |
584 |
|
585 |
delete pkt; |
586 |
} |
587 |
else |
588 |
{ |
589 |
slog (L_ERR, |
590 |
_("FATAL: unknown revents %08x in socket, terminating\n"), |
591 |
revents); |
592 |
exit (EXIT_FAILURE); |
593 |
} |
594 |
} |
595 |
#endif |
596 |
|
597 |
inline void |
598 |
vpn::udpv4_ev (ev::io &w, int revents) |
599 |
{ |
600 |
if (revents & EV_READ) |
601 |
{ |
602 |
vpn_packet *pkt = new vpn_packet; |
603 |
struct sockaddr_in sa; |
604 |
socklen_t sa_len = sizeof (sa); |
605 |
int len; |
606 |
|
607 |
len = recvfrom (w.fd, &((*pkt)[0]), MAXSIZE, 0, (sockaddr *)&sa, &sa_len); |
608 |
|
609 |
sockinfo si(sa, PROT_UDPv4); |
610 |
|
611 |
if (len > 0) |
612 |
{ |
613 |
pkt->len = len; |
614 |
|
615 |
recv_vpn_packet (pkt, si); |
616 |
} |
617 |
else |
618 |
{ |
619 |
// probably ECONNRESET or somesuch |
620 |
slog (L_DEBUG, _("%s: fd %d, %s"), (const char *)si, w.fd, strerror (errno)); |
621 |
} |
622 |
|
623 |
delete pkt; |
624 |
} |
625 |
else |
626 |
{ |
627 |
slog (L_ERR, |
628 |
_("FATAL: unknown revents %08x in socket, terminating\n"), |
629 |
revents); |
630 |
exit (EXIT_FAILURE); |
631 |
} |
632 |
} |
633 |
|
634 |
inline void |
635 |
vpn::tap_ev (ev::io &w, int revents) |
636 |
{ |
637 |
if (revents & EV_READ) |
638 |
{ |
639 |
/* process data */ |
640 |
tap_packet *pkt; |
641 |
|
642 |
pkt = tap->recv (); |
643 |
|
644 |
if (!pkt) |
645 |
return; |
646 |
|
647 |
if (pkt->len > 14) |
648 |
{ |
649 |
int dst = mac2id (pkt->dst); |
650 |
int src = mac2id (pkt->src); |
651 |
|
652 |
if (src != THISNODE->id) |
653 |
{ |
654 |
slog (L_ERR, _("FATAL: tap packet not originating on current node received (if-up script not working properly?), exiting.")); |
655 |
exit (EXIT_FAILURE); |
656 |
} |
657 |
|
658 |
if (dst == THISNODE->id) |
659 |
{ |
660 |
slog (L_ERR, _("FATAL: tap packet destined for current node received, exiting.")); |
661 |
exit (EXIT_FAILURE); |
662 |
} |
663 |
|
664 |
if (dst > conns.size ()) |
665 |
slog (L_ERR, _("tap packet for unknown node %d received, ignoring."), dst); |
666 |
else |
667 |
inject_data_packet (pkt, dst); |
668 |
} |
669 |
|
670 |
delete pkt; |
671 |
} |
672 |
else |
673 |
abort (); |
674 |
} |
675 |
|
676 |
inline void |
677 |
vpn::event_cb (ev::timer &w, int) |
678 |
{ |
679 |
if (events) |
680 |
{ |
681 |
if (events & EVENT_SHUTDOWN) |
682 |
{ |
683 |
slog (L_INFO, _("preparing shutdown...")); |
684 |
|
685 |
shutdown_all (); |
686 |
remove_pid (conf.pidfilename); |
687 |
slog (L_INFO, _("terminating")); |
688 |
exit (EXIT_SUCCESS); |
689 |
} |
690 |
|
691 |
if (events & EVENT_RECONNECT) |
692 |
{ |
693 |
slog (L_INFO, _("forced reconnect")); |
694 |
|
695 |
reconnect_all (); |
696 |
} |
697 |
|
698 |
events = 0; |
699 |
} |
700 |
} |
701 |
|
702 |
void |
703 |
vpn::shutdown_all () |
704 |
{ |
705 |
for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c) |
706 |
(*c)->shutdown (); |
707 |
} |
708 |
|
709 |
void |
710 |
vpn::reconnect_all () |
711 |
{ |
712 |
for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c) |
713 |
delete *c; |
714 |
|
715 |
conns.clear (); |
716 |
|
717 |
connection_init (); |
718 |
|
719 |
for (configuration::node_vector::iterator i = conf.nodes.begin (); |
720 |
i != conf.nodes.end (); ++i) |
721 |
{ |
722 |
connection *conn = new connection (this, *i); |
723 |
conns.push_back (conn); |
724 |
conn->establish_connection (); |
725 |
} |
726 |
} |
727 |
|
728 |
connection *vpn::find_router () |
729 |
{ |
730 |
u32 prio = 1; |
731 |
connection *router = 0; |
732 |
|
733 |
for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i) |
734 |
{ |
735 |
connection *c = *i; |
736 |
|
737 |
if (c->conf->routerprio > prio |
738 |
&& c->connectmode == conf_node::C_ALWAYS // so we don't drop the connection if in use |
739 |
&& c->ictx && c->octx |
740 |
&& c->conf != THISNODE) // redundant, since ictx==octx==0 always on thisnode |
741 |
{ |
742 |
prio = c->conf->routerprio; |
743 |
router = c; |
744 |
} |
745 |
} |
746 |
|
747 |
return router; |
748 |
} |
749 |
|
750 |
void vpn::send_connect_request (int id) |
751 |
{ |
752 |
connection *c = find_router (); |
753 |
|
754 |
if (c) |
755 |
c->send_connect_request (id); |
756 |
else |
757 |
// no router found, aggressively connect to all routers |
758 |
for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i) |
759 |
if ((*i)->conf->routerprio && (*i)->conf != THISNODE) |
760 |
(*i)->establish_connection (); |
761 |
} |
762 |
|
763 |
void |
764 |
connection::dump_status () |
765 |
{ |
766 |
slog (L_NOTICE, _("node %s (id %d)"), conf->nodename, conf->id); |
767 |
slog (L_NOTICE, _(" connectmode %d (%d) / sockaddr %s / minor %d"), |
768 |
connectmode, conf->connectmode, (const char *)si, (int)prot_minor); |
769 |
slog (L_NOTICE, _(" ictx/octx %08lx/%08lx / oseqno %d / retry_cnt %d"), |
770 |
(long)ictx, (long)octx, (int)oseqno, (int)retry_cnt); |
771 |
slog (L_NOTICE, _(" establish_conn %ld / rekey %ld / keepalive %ld"), |
772 |
(long)(establish_connection.at), (long)(rekey.at), (long)(keepalive.at)); |
773 |
} |
774 |
|
775 |
void |
776 |
vpn::dump_status () |
777 |
{ |
778 |
slog (L_NOTICE, _("BEGIN status dump (%ld)"), (long)ev_now ()); |
779 |
|
780 |
for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c) |
781 |
(*c)->dump_status (); |
782 |
|
783 |
slog (L_NOTICE, _("END status dump")); |
784 |
} |
785 |
|
786 |
vpn::vpn (void) |
787 |
{ |
788 |
event .set<vpn, &vpn::event_cb > (this); |
789 |
udpv4_ev_watcher .set<vpn, &vpn::udpv4_ev > (this); |
790 |
ipv4_ev_watcher .set<vpn, &vpn::ipv4_ev > (this); |
791 |
#if ENABLE_TCP |
792 |
tcpv4_ev_watcher .set<vpn, &vpn::tcpv4_ev > (this); |
793 |
#endif |
794 |
#if ENABLE_ICMP |
795 |
icmpv4_ev_watcher.set<vpn, &vpn::icmpv4_ev> (this); |
796 |
#endif |
797 |
#if ENABLE_DNS |
798 |
dnsv4_ev_watcher .set<vpn, &vpn::dnsv4_ev > (this); |
799 |
#endif |
800 |
tap_ev_watcher .set<vpn, &vpn::tap_ev > (this); |
801 |
} |
802 |
|
803 |
vpn::~vpn () |
804 |
{ |
805 |
} |
806 |
|