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/* |
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vpn.C -- handle the protocol, encryption, handshaking etc. |
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|
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This program 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 this program; if not, write to the Free Software |
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Foundation, Inc. 59 Temple Place, Suite 330, Boston, MA 02111-1307 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> |
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|
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#include <cstdlib> |
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#include <cstring> |
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#include <cstdio> |
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|
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#include <sys/types.h> |
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#include <sys/socket.h> |
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#include <sys/poll.h> |
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#include <sys/wait.h> |
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#include <netinet/in.h> |
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#include <arpa/inet.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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|
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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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#if ENABLE_TCP |
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# include <map> |
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# include <unistd.h> |
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# include <fcntl.h> |
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# include <sys/poll.h> |
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#endif |
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|
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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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// 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); |
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putenv (env); |
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asprintf (&env, "NODENAME=%s", THISNODE->nodename); |
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putenv (env); |
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asprintf (&env, "NODEID=%d", THISNODE->id); |
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putenv (env); |
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asprintf (&env, "IFNAME=%s", tap->interface ()); |
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putenv (env); |
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asprintf (&env, "MTU=%d", mtu); |
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putenv (env); |
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asprintf (&env, "MAC=%02x:%02x:%02x:%02x:%02x:%02x", |
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0xfe, 0xfd, 0x80, 0x00, THISNODE->id >> 8, |
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THISNODE->id & 0xff); |
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putenv (env); |
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|
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return ::conf.script_if_up ? ::conf.script_if_up : "if-up"; |
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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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udpv4_fd = -1; |
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|
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if (THISNODE->protocols & PROT_UDPv4) |
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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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// 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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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 (1); |
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} |
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|
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#ifdef 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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udpv4_ev_watcher.start (udpv4_fd, POLLIN); |
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} |
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|
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ipv4_fd = -1; |
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if (THISNODE->protocols & PROT_IPv4) |
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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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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 (1); |
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} |
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|
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#ifdef 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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ipv4_ev_watcher.start (ipv4_fd, POLLIN); |
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} |
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|
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#if ENABLE_TCP |
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if (THISNODE->protocols & PROT_TCPv4) |
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{ |
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tcpv4_fd = socket (PF_INET, SOCK_STREAM, IPPROTO_TCP); |
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|
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if (tcpv4_fd < 0) |
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return -1; |
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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 (tcpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval); |
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} |
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|
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sockinfo si (THISNODE, PROT_TCPv4); |
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|
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if (bind (tcpv4_fd, si.sav4 (), si.salenv4 ())) |
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{ |
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slog (L_ERR, _("can't bind tcpv4 on %s: %s"), (const char *)si, strerror (errno)); |
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exit (1); |
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} |
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|
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if (listen (tcpv4_fd, 5)) |
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{ |
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slog (L_ERR, _("can't listen tcpv4 on %s: %s"), (const char *)si, strerror (errno)); |
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exit (1); |
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} |
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|
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tcpv4_ev_watcher.start (tcpv4_fd, POLLIN); |
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} |
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#endif |
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|
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tap = new tap_device (); |
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if (!tap) //D this, of course, never catches |
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{ |
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slog (L_ERR, _("cannot create network interface '%s'"), conf.ifname); |
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exit (1); |
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} |
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|
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run_script (run_script_cb (this, &vpn::script_if_up), true); |
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|
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tap_ev_watcher.start (tap->fd, POLLIN); |
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|
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reconnect_all (); |
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|
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return 0; |
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} |
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|
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void |
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vpn::send_ipv4_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
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{ |
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setsockopt (ipv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos); |
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sendto (ipv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ()); |
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} |
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|
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void |
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vpn::send_udpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
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{ |
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setsockopt (udpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos); |
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sendto (udpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ()); |
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} |
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|
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void |
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vpn::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi) |
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{ |
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unsigned int src = pkt->src (); |
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unsigned int dst = pkt->dst (); |
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|
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slog (L_NOISE, _("<<?/%s received possible vpn packet type %d from %d to %d, length %d"), |
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(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst (), pkt->len); |
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|
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if (src == 0 || src > conns.size () |
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|| dst > conns.size () |
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|| pkt->typ () >= vpn_packet::PT_MAX) |
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slog (L_WARN, _("(%s): received corrupted packet type %d (src %d, dst %d)"), |
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(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ()); |
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else |
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{ |
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connection *c = conns[src - 1]; |
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|
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if (dst == 0 && !THISNODE->routerprio) |
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slog (L_WARN, _("%s(%s): received broadcast, but we are no router"), |
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c->conf->nodename, (const char *)rsi); |
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else if (dst != 0 && dst != THISNODE->id) |
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// FORWARDING NEEDED ;) |
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slog (L_WARN, |
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_("received frame for node %d ('%s') from %s, but this is node %d ('%s')"), |
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dst, conns[dst - 1]->conf->nodename, |
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(const char *)rsi, |
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THISNODE->id, THISNODE->nodename); |
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else |
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c->recv_vpn_packet (pkt, rsi); |
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} |
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} |
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|
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void |
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vpn::udpv4_ev (io_watcher &w, short revents) |
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{ |
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if (revents & (POLLIN | POLLERR)) |
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{ |
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vpn_packet *pkt = new vpn_packet; |
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struct sockaddr_in sa; |
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socklen_t sa_len = sizeof (sa); |
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int len; |
252 |
|
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len = recvfrom (w.fd, &((*pkt)[0]), MAXSIZE, 0, (sockaddr *)&sa, &sa_len); |
254 |
|
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sockinfo si(sa); |
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|
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if (len > 0) |
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{ |
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pkt->len = len; |
260 |
|
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recv_vpn_packet (pkt, si); |
262 |
} |
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else |
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{ |
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// probably ECONNRESET or somesuch |
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slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno)); |
267 |
} |
268 |
|
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delete pkt; |
270 |
} |
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else if (revents & POLLHUP) |
272 |
{ |
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// this cannot ;) happen on udp sockets |
274 |
slog (L_ERR, _("FATAL: POLLHUP on udp v4 fd, terminating.")); |
275 |
exit (1); |
276 |
} |
277 |
else |
278 |
{ |
279 |
slog (L_ERR, |
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_("FATAL: unknown revents %08x in socket, terminating\n"), |
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revents); |
282 |
exit (1); |
283 |
} |
284 |
} |
285 |
|
286 |
void |
287 |
vpn::ipv4_ev (io_watcher &w, short revents) |
288 |
{ |
289 |
if (revents & (POLLIN | POLLERR)) |
290 |
{ |
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vpn_packet *pkt = new vpn_packet; |
292 |
struct sockaddr_in sa; |
293 |
socklen_t sa_len = sizeof (sa); |
294 |
int len; |
295 |
|
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len = recvfrom (w.fd, &((*pkt)[0]), MAXSIZE, 0, (sockaddr *)&sa, &sa_len); |
297 |
|
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sockinfo si(sa, PROT_IPv4); |
299 |
|
300 |
if (len > 0) |
301 |
{ |
302 |
pkt->len = len; |
303 |
|
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// raw sockets deliver the ipv4, but don't expect it on sends |
305 |
// this is slow, but... |
306 |
pkt->skip_hdr (IP_OVERHEAD); |
307 |
|
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recv_vpn_packet (pkt, si); |
309 |
} |
310 |
else |
311 |
{ |
312 |
// probably ECONNRESET or somesuch |
313 |
slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno)); |
314 |
} |
315 |
|
316 |
delete pkt; |
317 |
} |
318 |
else if (revents & POLLHUP) |
319 |
{ |
320 |
// this cannot ;) happen on udp sockets |
321 |
slog (L_ERR, _("FATAL: POLLHUP on ipv4 fd, terminating.")); |
322 |
exit (1); |
323 |
} |
324 |
else |
325 |
{ |
326 |
slog (L_ERR, |
327 |
_("FATAL: unknown revents %08x in socket, terminating\n"), |
328 |
revents); |
329 |
exit (1); |
330 |
} |
331 |
} |
332 |
|
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#if ENABLE_TCP |
334 |
|
335 |
struct tcp_connection; |
336 |
|
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struct lt_sockinfo |
338 |
{ |
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bool operator()(const sockinfo *a, const sockinfo *b) const |
340 |
{ |
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return *a < *b; |
342 |
} |
343 |
}; |
344 |
|
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struct tcp_si_map : public map<const sockinfo *, tcp_connection *, lt_sockinfo> { |
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void cleaner_cb (time_watcher &w); time_watcher cleaner; |
347 |
|
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tcp_si_map () |
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: cleaner(this, &tcp_si_map::cleaner_cb) |
350 |
{ |
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cleaner.start (0); |
352 |
} |
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} tcp_si; |
354 |
|
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struct tcp_connection : io_watcher { |
356 |
tstamp last_activity; |
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const sockinfo si; |
358 |
vpn &v; |
359 |
bool ok; |
360 |
|
361 |
void tcpv4_ev (io_watcher &w, short revents); |
362 |
|
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operator tcp_si_map::value_type() |
364 |
{ |
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return tcp_si_map::value_type (&si, this); |
366 |
} |
367 |
|
368 |
tcp_connection (int fd_, const sockinfo &si_, vpn &v_) |
369 |
: v(v_), si(si_), io_watcher(this, &tcp_connection::tcpv4_ev), ok(false) |
370 |
{ |
371 |
last_activity = NOW; |
372 |
start (fd_, POLLOUT); |
373 |
} |
374 |
|
375 |
~tcp_connection () { close (fd); } |
376 |
}; |
377 |
|
378 |
void tcp_si_map::cleaner_cb (time_watcher &w) |
379 |
{ |
380 |
w.at = NOW + 600; |
381 |
tstamp to = NOW - ::conf.keepalive - 30; |
382 |
|
383 |
for (iterator i = begin (); i != end(); ) |
384 |
if (i->second->last_activity >= to) |
385 |
++i; |
386 |
else |
387 |
{ |
388 |
erase (i); |
389 |
i = begin (); |
390 |
} |
391 |
} |
392 |
|
393 |
void |
394 |
vpn::send_tcpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
395 |
{ |
396 |
tcp_si_map::iterator info = tcp_si.find (&si); |
397 |
|
398 |
if (info == tcp_si.end ()) |
399 |
{ |
400 |
// woaw, the first lost packet ;) |
401 |
int fd = socket (PF_INET, SOCK_STREAM, IPPROTO_TCP); |
402 |
|
403 |
if (fd >= 0) |
404 |
{ |
405 |
fcntl (fd, F_SETFL, O_NONBLOCK); |
406 |
|
407 |
if (connect (fd, si.sav4 (), si.salenv4 ()) >= 0 |
408 |
|| errno == EINPROGRESS) |
409 |
{ |
410 |
tcp_connection *i = new tcp_connection (fd, si, *this); |
411 |
|
412 |
tcp_si.insert (*i); |
413 |
} |
414 |
else |
415 |
close (fd); |
416 |
} |
417 |
} |
418 |
else |
419 |
{ |
420 |
tcp_connection *i = info->second; |
421 |
|
422 |
i->last_activity = NOW; |
423 |
|
424 |
if (i->ok) |
425 |
{ |
426 |
setsockopt (i->fd, SOL_IP, IP_TOS, &tos, sizeof tos); |
427 |
|
428 |
// we use none of the advantages of tcp |
429 |
write (i->fd, (void *)pkt, pkt->len + sizeof (u32)) != pkt->len + sizeof (u32); |
430 |
} |
431 |
} |
432 |
|
433 |
#if 0 |
434 |
setsockopt (udpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos); |
435 |
sendto (udpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ()); |
436 |
#endif |
437 |
} |
438 |
|
439 |
void |
440 |
tcp_connection::tcpv4_ev (io_watcher &w, short revents) |
441 |
{ |
442 |
last_activity = NOW; |
443 |
|
444 |
if (!ok) // just established? |
445 |
{ |
446 |
ok = true; |
447 |
fcntl (fd, F_SETFL, 0); |
448 |
stop (); |
449 |
start (fd, POLLIN); |
450 |
} |
451 |
|
452 |
if (revents & (POLLIN | POLLERR)) |
453 |
{ |
454 |
u32 len; |
455 |
|
456 |
if (sizeof (len) == read (fd, &len, sizeof (len))) |
457 |
{ |
458 |
vpn_packet *pkt = new vpn_packet; |
459 |
|
460 |
if (len == read (fd, &((*pkt)[0]), len)) |
461 |
{ |
462 |
pkt->len = len; |
463 |
|
464 |
v.recv_vpn_packet (pkt, si); |
465 |
return; |
466 |
} |
467 |
|
468 |
delete pkt; |
469 |
} |
470 |
|
471 |
tcp_si.erase (&si); |
472 |
stop (); |
473 |
} |
474 |
} |
475 |
|
476 |
void |
477 |
vpn::tcpv4_ev (io_watcher &w, short revents) |
478 |
{ |
479 |
if (revents & (POLLIN | POLLERR)) |
480 |
{ |
481 |
struct sockaddr_in sa; |
482 |
socklen_t sa_len = sizeof (sa); |
483 |
int len; |
484 |
|
485 |
int fd = accept (w.fd, (sockaddr *)&sa, &sa_len); |
486 |
|
487 |
if (fd >= 0) |
488 |
{ |
489 |
fcntl (fd, F_SETFL, O_NONBLOCK); |
490 |
|
491 |
sockinfo si(sa, PROT_TCPv4); |
492 |
tcp_connection *i = new tcp_connection (fd, si, *this); |
493 |
|
494 |
slog (L_ERR, "accepted %d\n", fd);//D |
495 |
|
496 |
tcp_si.insert (*i); |
497 |
} |
498 |
} |
499 |
} |
500 |
|
501 |
#endif |
502 |
|
503 |
void |
504 |
vpn::tap_ev (io_watcher &w, short revents) |
505 |
{ |
506 |
if (revents & POLLIN) |
507 |
{ |
508 |
/* process data */ |
509 |
tap_packet *pkt; |
510 |
|
511 |
pkt = tap->recv (); |
512 |
|
513 |
int dst = mac2id (pkt->dst); |
514 |
int src = mac2id (pkt->src); |
515 |
|
516 |
if (src != THISNODE->id) |
517 |
{ |
518 |
slog (L_ERR, _("FATAL: tap packet not originating on current node received, terminating.")); |
519 |
exit (1); |
520 |
} |
521 |
|
522 |
if (dst == THISNODE->id) |
523 |
{ |
524 |
slog (L_ERR, _("FATAL: tap packet destined for current node received, terminating.")); |
525 |
exit (1); |
526 |
} |
527 |
|
528 |
if (dst > conns.size ()) |
529 |
slog (L_ERR, _("tap packet for unknown node %d received, ignoring."), dst); |
530 |
else |
531 |
{ |
532 |
if (dst) |
533 |
{ |
534 |
// unicast |
535 |
if (dst != THISNODE->id) |
536 |
conns[dst - 1]->inject_data_packet (pkt); |
537 |
} |
538 |
else |
539 |
{ |
540 |
// broadcast, first check router, then self, then english |
541 |
connection *router = find_router (); |
542 |
|
543 |
if (router) |
544 |
router->inject_data_packet (pkt, true); |
545 |
else |
546 |
for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c) |
547 |
if ((*c)->conf != THISNODE) |
548 |
(*c)->inject_data_packet (pkt); |
549 |
} |
550 |
} |
551 |
|
552 |
delete pkt; |
553 |
} |
554 |
else if (revents & (POLLHUP | POLLERR)) |
555 |
{ |
556 |
slog (L_ERR, _("FATAL: POLLHUP or POLLERR on network device fd, terminating.")); |
557 |
exit (1); |
558 |
} |
559 |
else |
560 |
abort (); |
561 |
} |
562 |
|
563 |
void |
564 |
vpn::event_cb (time_watcher &w) |
565 |
{ |
566 |
if (events) |
567 |
{ |
568 |
if (events & EVENT_SHUTDOWN) |
569 |
{ |
570 |
slog (L_INFO, _("preparing shutdown...")); |
571 |
|
572 |
shutdown_all (); |
573 |
|
574 |
remove_pid (pidfilename); |
575 |
|
576 |
slog (L_INFO, _("terminating")); |
577 |
|
578 |
exit (0); |
579 |
} |
580 |
|
581 |
if (events & EVENT_RECONNECT) |
582 |
{ |
583 |
slog (L_INFO, _("forced reconnect")); |
584 |
|
585 |
reconnect_all (); |
586 |
} |
587 |
|
588 |
events = 0; |
589 |
} |
590 |
|
591 |
w.at = TSTAMP_CANCEL; |
592 |
} |
593 |
|
594 |
void |
595 |
vpn::shutdown_all () |
596 |
{ |
597 |
for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c) |
598 |
(*c)->shutdown (); |
599 |
} |
600 |
|
601 |
void |
602 |
vpn::reconnect_all () |
603 |
{ |
604 |
for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c) |
605 |
delete *c; |
606 |
|
607 |
conns.clear (); |
608 |
|
609 |
connection_init (); |
610 |
|
611 |
for (configuration::node_vector::iterator i = conf.nodes.begin (); |
612 |
i != conf.nodes.end (); ++i) |
613 |
{ |
614 |
connection *conn = new connection (this); |
615 |
|
616 |
conn->conf = *i; |
617 |
conns.push_back (conn); |
618 |
|
619 |
conn->establish_connection (); |
620 |
} |
621 |
} |
622 |
|
623 |
connection *vpn::find_router () |
624 |
{ |
625 |
u32 prio = 0; |
626 |
connection *router = 0; |
627 |
|
628 |
for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i) |
629 |
{ |
630 |
connection *c = *i; |
631 |
|
632 |
if (c->conf->routerprio > prio |
633 |
&& c->connectmode == conf_node::C_ALWAYS |
634 |
&& c->conf != THISNODE |
635 |
&& c->ictx && c->octx) |
636 |
{ |
637 |
prio = c->conf->routerprio; |
638 |
router = c; |
639 |
} |
640 |
} |
641 |
|
642 |
return router; |
643 |
} |
644 |
|
645 |
void vpn::connect_request (int id) |
646 |
{ |
647 |
connection *c = find_router (); |
648 |
|
649 |
if (c) |
650 |
c->connect_request (id); |
651 |
//else // does not work, because all others must connect to the same router |
652 |
// // no router found, aggressively connect to all routers |
653 |
// for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i) |
654 |
// if ((*i)->conf->routerprio) |
655 |
// (*i)->establish_connection (); |
656 |
} |
657 |
|
658 |
void |
659 |
connection::dump_status () |
660 |
{ |
661 |
slog (L_NOTICE, _("node %s (id %d)"), conf->nodename, conf->id); |
662 |
slog (L_NOTICE, _(" connectmode %d (%d) / sockaddr %s / minor %d"), |
663 |
connectmode, conf->connectmode, (const char *)si, (int)prot_minor); |
664 |
slog (L_NOTICE, _(" ictx/octx %08lx/%08lx / oseqno %d / retry_cnt %d"), |
665 |
(long)ictx, (long)octx, (int)oseqno, (int)retry_cnt); |
666 |
slog (L_NOTICE, _(" establish_conn %ld / rekey %ld / keepalive %ld"), |
667 |
(long)(establish_connection.at), (long)(rekey.at), (long)(keepalive.at)); |
668 |
} |
669 |
|
670 |
void |
671 |
vpn::dump_status () |
672 |
{ |
673 |
slog (L_NOTICE, _("BEGIN status dump (%ld)"), (long)NOW); |
674 |
|
675 |
for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c) |
676 |
(*c)->dump_status (); |
677 |
|
678 |
slog (L_NOTICE, _("END status dump")); |
679 |
} |
680 |
|
681 |
vpn::vpn (void) |
682 |
: event(this, &vpn::event_cb) |
683 |
, udpv4_ev_watcher(this, &vpn::udpv4_ev) |
684 |
, ipv4_ev_watcher (this, &vpn::ipv4_ev) |
685 |
, tap_ev_watcher (this, &vpn::tap_ev) |
686 |
#if ENABLE_TCP |
687 |
, tcpv4_ev_watcher(this, &vpn::tcpv4_ev) |
688 |
#endif |
689 |
{ |
690 |
} |
691 |
|
692 |
vpn::~vpn () |
693 |
{ |
694 |
} |
695 |
|