1 |
pcg |
1.1 |
/* |
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vpn.C -- handle the protocol, encryption, handshaking etc. |
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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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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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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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#include "config.h" |
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#include <list> |
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#include <cstdlib> |
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#include <cstring> |
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#include <cstdio> |
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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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#include "pidfile.h" |
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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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45 |
pcg |
1.2 |
const char *vpn::script_if_up () |
46 |
pcg |
1.1 |
{ |
47 |
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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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54 |
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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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return ::conf.script_if_up ? ::conf.script_if_up : "if-up"; |
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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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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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if (udpv4_fd < 0) |
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return -1; |
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pcg |
1.3 |
// 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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91 |
pcg |
1.2 |
sockinfo si (THISNODE, PROT_UDPv4); |
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pcg |
1.1 |
if (bind (udpv4_fd, si.sav4 (), si.salenv4 ())) |
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{ |
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pcg |
1.2 |
slog (L_ERR, _("can't bind udpv4 on %s: %s"), (const char *)si, strerror (errno)); |
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pcg |
1.1 |
exit (1); |
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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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udpv4_ev_watcher.start (udpv4_fd, POLLIN); |
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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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if (ipv4_fd < 0) |
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return -1; |
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120 |
pcg |
1.2 |
sockinfo si (THISNODE, PROT_IPv4); |
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122 |
pcg |
1.1 |
if (bind (ipv4_fd, si.sav4 (), si.salenv4 ())) |
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{ |
124 |
pcg |
1.2 |
slog (L_ERR, _("can't bind ipv4 socket on %s: %s"), (const char *)si, strerror (errno)); |
125 |
pcg |
1.1 |
exit (1); |
126 |
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} |
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128 |
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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 |
137 |
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ipv4_ev_watcher.start (ipv4_fd, POLLIN); |
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} |
140 |
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141 |
pcg |
1.2 |
#if ENABLE_TCP |
142 |
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if (THISNODE->protocols & PROT_TCPv4) |
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{ |
144 |
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tcpv4_fd = socket (PF_INET, SOCK_STREAM, IPPROTO_TCP); |
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146 |
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if (tcpv4_fd < 0) |
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return -1; |
148 |
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149 |
pcg |
1.3 |
// standard daemon practise... |
150 |
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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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} |
154 |
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155 |
pcg |
1.2 |
sockinfo si (THISNODE, PROT_TCPv4); |
156 |
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157 |
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if (bind (tcpv4_fd, si.sav4 (), si.salenv4 ())) |
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{ |
159 |
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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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} |
162 |
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163 |
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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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169 |
pcg |
1.3 |
tcpv4_ev_watcher.start (tcpv4_fd, POLLIN); |
170 |
pcg |
1.2 |
} |
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#endif |
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173 |
pcg |
1.1 |
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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run_script (run_script_cb (this, &vpn::script_if_up), true); |
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182 |
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tap_ev_watcher.start (tap->fd, POLLIN); |
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184 |
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reconnect_all (); |
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186 |
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return 0; |
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} |
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189 |
pcg |
1.5 |
// send a vpn packet out to other hosts |
190 |
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void |
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vpn::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
192 |
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{ |
193 |
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switch (si.prot) |
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{ |
195 |
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case PROT_IPv4: |
196 |
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send_ipv4_packet (pkt, si, tos); |
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break; |
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199 |
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case PROT_UDPv4: |
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send_udpv4_packet (pkt, si, tos); |
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break; |
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203 |
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#if ENABLE_TCP |
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case PROT_TCPv4: |
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send_tcpv4_packet (pkt, si, tos); |
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break; |
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#endif |
208 |
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209 |
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default: |
210 |
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slog (L_CRIT, _("%s: FATAL: trying to send packet with unsupported protocol"), (const char *)si); |
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abort (); |
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} |
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} |
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215 |
pcg |
1.1 |
void |
216 |
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vpn::send_ipv4_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
217 |
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{ |
218 |
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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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} |
221 |
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void |
223 |
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vpn::send_udpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
224 |
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{ |
225 |
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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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229 |
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void |
230 |
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vpn::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi) |
231 |
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{ |
232 |
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unsigned int src = pkt->src (); |
233 |
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unsigned int dst = pkt->dst (); |
234 |
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235 |
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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); |
237 |
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238 |
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if (src == 0 || src > conns.size () |
239 |
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|| dst > conns.size () |
240 |
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|| pkt->typ () >= vpn_packet::PT_MAX) |
241 |
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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 ()); |
243 |
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else |
244 |
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{ |
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connection *c = conns[src - 1]; |
246 |
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247 |
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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"), |
249 |
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c->conf->nodename, (const char *)rsi); |
250 |
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else if (dst != 0 && dst != THISNODE->id) |
251 |
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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')"), |
254 |
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dst, conns[dst - 1]->conf->nodename, |
255 |
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(const char *)rsi, |
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THISNODE->id, THISNODE->nodename); |
257 |
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else |
258 |
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c->recv_vpn_packet (pkt, rsi); |
259 |
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} |
260 |
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} |
261 |
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262 |
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void |
263 |
pcg |
1.3 |
vpn::udpv4_ev (io_watcher &w, short revents) |
264 |
pcg |
1.1 |
{ |
265 |
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if (revents & (POLLIN | POLLERR)) |
266 |
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{ |
267 |
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vpn_packet *pkt = new vpn_packet; |
268 |
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struct sockaddr_in sa; |
269 |
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socklen_t sa_len = sizeof (sa); |
270 |
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int len; |
271 |
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|
272 |
pcg |
1.5 |
len = recvfrom (w.fd, &((*pkt)[0]), MAXSIZE, 0, (sockaddr *)&sa, &sa_len); |
273 |
pcg |
1.1 |
|
274 |
pcg |
1.5 |
sockinfo si(sa, PROT_UDPv4); |
275 |
pcg |
1.1 |
|
276 |
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if (len > 0) |
277 |
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{ |
278 |
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pkt->len = len; |
279 |
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280 |
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recv_vpn_packet (pkt, si); |
281 |
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} |
282 |
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else |
283 |
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{ |
284 |
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// probably ECONNRESET or somesuch |
285 |
pcg |
1.5 |
slog (L_DEBUG, _("%s: fd %d, %s"), (const char *)si, w.fd, strerror (errno)); |
286 |
pcg |
1.1 |
} |
287 |
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288 |
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delete pkt; |
289 |
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} |
290 |
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else if (revents & POLLHUP) |
291 |
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{ |
292 |
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// this cannot ;) happen on udp sockets |
293 |
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slog (L_ERR, _("FATAL: POLLHUP on udp v4 fd, terminating.")); |
294 |
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exit (1); |
295 |
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} |
296 |
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else |
297 |
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{ |
298 |
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slog (L_ERR, |
299 |
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_("FATAL: unknown revents %08x in socket, terminating\n"), |
300 |
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revents); |
301 |
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exit (1); |
302 |
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} |
303 |
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} |
304 |
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|
305 |
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void |
306 |
pcg |
1.3 |
vpn::ipv4_ev (io_watcher &w, short revents) |
307 |
pcg |
1.1 |
{ |
308 |
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if (revents & (POLLIN | POLLERR)) |
309 |
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{ |
310 |
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vpn_packet *pkt = new vpn_packet; |
311 |
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struct sockaddr_in sa; |
312 |
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socklen_t sa_len = sizeof (sa); |
313 |
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int len; |
314 |
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|
315 |
pcg |
1.5 |
len = recvfrom (w.fd, &((*pkt)[0]), MAXSIZE, 0, (sockaddr *)&sa, &sa_len); |
316 |
pcg |
1.1 |
|
317 |
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sockinfo si(sa, PROT_IPv4); |
318 |
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|
319 |
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if (len > 0) |
320 |
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{ |
321 |
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pkt->len = len; |
322 |
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|
323 |
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// raw sockets deliver the ipv4, but don't expect it on sends |
324 |
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// this is slow, but... |
325 |
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pkt->skip_hdr (IP_OVERHEAD); |
326 |
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|
327 |
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recv_vpn_packet (pkt, si); |
328 |
|
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} |
329 |
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else |
330 |
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{ |
331 |
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// probably ECONNRESET or somesuch |
332 |
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slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno)); |
333 |
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} |
334 |
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|
335 |
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delete pkt; |
336 |
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} |
337 |
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else if (revents & POLLHUP) |
338 |
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{ |
339 |
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// this cannot ;) happen on udp sockets |
340 |
|
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slog (L_ERR, _("FATAL: POLLHUP on ipv4 fd, terminating.")); |
341 |
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exit (1); |
342 |
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} |
343 |
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else |
344 |
|
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{ |
345 |
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slog (L_ERR, |
346 |
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_("FATAL: unknown revents %08x in socket, terminating\n"), |
347 |
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revents); |
348 |
|
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exit (1); |
349 |
|
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} |
350 |
|
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} |
351 |
pcg |
1.2 |
|
352 |
|
|
void |
353 |
pcg |
1.3 |
vpn::tap_ev (io_watcher &w, short revents) |
354 |
pcg |
1.1 |
{ |
355 |
|
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if (revents & POLLIN) |
356 |
|
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{ |
357 |
|
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/* process data */ |
358 |
|
|
tap_packet *pkt; |
359 |
|
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|
360 |
|
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pkt = tap->recv (); |
361 |
|
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|
362 |
|
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int dst = mac2id (pkt->dst); |
363 |
|
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int src = mac2id (pkt->src); |
364 |
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|
365 |
|
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if (src != THISNODE->id) |
366 |
|
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{ |
367 |
|
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slog (L_ERR, _("FATAL: tap packet not originating on current node received, terminating.")); |
368 |
|
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exit (1); |
369 |
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} |
370 |
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|
371 |
|
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if (dst == THISNODE->id) |
372 |
|
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{ |
373 |
|
|
slog (L_ERR, _("FATAL: tap packet destined for current node received, terminating.")); |
374 |
|
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exit (1); |
375 |
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} |
376 |
|
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|
377 |
|
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if (dst > conns.size ()) |
378 |
|
|
slog (L_ERR, _("tap packet for unknown node %d received, ignoring."), dst); |
379 |
|
|
else |
380 |
|
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{ |
381 |
|
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if (dst) |
382 |
|
|
{ |
383 |
|
|
// unicast |
384 |
|
|
if (dst != THISNODE->id) |
385 |
|
|
conns[dst - 1]->inject_data_packet (pkt); |
386 |
|
|
} |
387 |
|
|
else |
388 |
|
|
{ |
389 |
|
|
// broadcast, first check router, then self, then english |
390 |
|
|
connection *router = find_router (); |
391 |
|
|
|
392 |
|
|
if (router) |
393 |
|
|
router->inject_data_packet (pkt, true); |
394 |
|
|
else |
395 |
|
|
for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c) |
396 |
|
|
if ((*c)->conf != THISNODE) |
397 |
|
|
(*c)->inject_data_packet (pkt); |
398 |
|
|
} |
399 |
|
|
} |
400 |
|
|
|
401 |
|
|
delete pkt; |
402 |
|
|
} |
403 |
|
|
else if (revents & (POLLHUP | POLLERR)) |
404 |
|
|
{ |
405 |
|
|
slog (L_ERR, _("FATAL: POLLHUP or POLLERR on network device fd, terminating.")); |
406 |
|
|
exit (1); |
407 |
|
|
} |
408 |
|
|
else |
409 |
|
|
abort (); |
410 |
|
|
} |
411 |
|
|
|
412 |
|
|
void |
413 |
pcg |
1.3 |
vpn::event_cb (time_watcher &w) |
414 |
pcg |
1.1 |
{ |
415 |
|
|
if (events) |
416 |
|
|
{ |
417 |
|
|
if (events & EVENT_SHUTDOWN) |
418 |
|
|
{ |
419 |
|
|
slog (L_INFO, _("preparing shutdown...")); |
420 |
|
|
|
421 |
|
|
shutdown_all (); |
422 |
|
|
|
423 |
|
|
remove_pid (pidfilename); |
424 |
|
|
|
425 |
|
|
slog (L_INFO, _("terminating")); |
426 |
|
|
|
427 |
|
|
exit (0); |
428 |
|
|
} |
429 |
|
|
|
430 |
|
|
if (events & EVENT_RECONNECT) |
431 |
|
|
{ |
432 |
|
|
slog (L_INFO, _("forced reconnect")); |
433 |
|
|
|
434 |
|
|
reconnect_all (); |
435 |
|
|
} |
436 |
|
|
|
437 |
|
|
events = 0; |
438 |
|
|
} |
439 |
|
|
|
440 |
pcg |
1.3 |
w.at = TSTAMP_CANCEL; |
441 |
pcg |
1.1 |
} |
442 |
|
|
|
443 |
|
|
void |
444 |
|
|
vpn::shutdown_all () |
445 |
|
|
{ |
446 |
|
|
for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c) |
447 |
|
|
(*c)->shutdown (); |
448 |
|
|
} |
449 |
|
|
|
450 |
|
|
void |
451 |
|
|
vpn::reconnect_all () |
452 |
|
|
{ |
453 |
|
|
for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c) |
454 |
|
|
delete *c; |
455 |
|
|
|
456 |
|
|
conns.clear (); |
457 |
|
|
|
458 |
|
|
connection_init (); |
459 |
|
|
|
460 |
|
|
for (configuration::node_vector::iterator i = conf.nodes.begin (); |
461 |
|
|
i != conf.nodes.end (); ++i) |
462 |
|
|
{ |
463 |
|
|
connection *conn = new connection (this); |
464 |
|
|
|
465 |
|
|
conn->conf = *i; |
466 |
|
|
conns.push_back (conn); |
467 |
|
|
|
468 |
|
|
conn->establish_connection (); |
469 |
|
|
} |
470 |
|
|
} |
471 |
|
|
|
472 |
|
|
connection *vpn::find_router () |
473 |
|
|
{ |
474 |
|
|
u32 prio = 0; |
475 |
|
|
connection *router = 0; |
476 |
|
|
|
477 |
|
|
for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i) |
478 |
|
|
{ |
479 |
|
|
connection *c = *i; |
480 |
|
|
|
481 |
|
|
if (c->conf->routerprio > prio |
482 |
|
|
&& c->connectmode == conf_node::C_ALWAYS |
483 |
|
|
&& c->conf != THISNODE |
484 |
|
|
&& c->ictx && c->octx) |
485 |
|
|
{ |
486 |
|
|
prio = c->conf->routerprio; |
487 |
|
|
router = c; |
488 |
|
|
} |
489 |
|
|
} |
490 |
|
|
|
491 |
|
|
return router; |
492 |
|
|
} |
493 |
|
|
|
494 |
|
|
void vpn::connect_request (int id) |
495 |
|
|
{ |
496 |
|
|
connection *c = find_router (); |
497 |
|
|
|
498 |
|
|
if (c) |
499 |
|
|
c->connect_request (id); |
500 |
|
|
//else // does not work, because all others must connect to the same router |
501 |
|
|
// // no router found, aggressively connect to all routers |
502 |
|
|
// for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i) |
503 |
|
|
// if ((*i)->conf->routerprio) |
504 |
|
|
// (*i)->establish_connection (); |
505 |
|
|
} |
506 |
|
|
|
507 |
|
|
void |
508 |
|
|
connection::dump_status () |
509 |
|
|
{ |
510 |
|
|
slog (L_NOTICE, _("node %s (id %d)"), conf->nodename, conf->id); |
511 |
|
|
slog (L_NOTICE, _(" connectmode %d (%d) / sockaddr %s / minor %d"), |
512 |
|
|
connectmode, conf->connectmode, (const char *)si, (int)prot_minor); |
513 |
|
|
slog (L_NOTICE, _(" ictx/octx %08lx/%08lx / oseqno %d / retry_cnt %d"), |
514 |
|
|
(long)ictx, (long)octx, (int)oseqno, (int)retry_cnt); |
515 |
|
|
slog (L_NOTICE, _(" establish_conn %ld / rekey %ld / keepalive %ld"), |
516 |
|
|
(long)(establish_connection.at), (long)(rekey.at), (long)(keepalive.at)); |
517 |
|
|
} |
518 |
|
|
|
519 |
|
|
void |
520 |
|
|
vpn::dump_status () |
521 |
|
|
{ |
522 |
|
|
slog (L_NOTICE, _("BEGIN status dump (%ld)"), (long)NOW); |
523 |
|
|
|
524 |
|
|
for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c) |
525 |
|
|
(*c)->dump_status (); |
526 |
|
|
|
527 |
|
|
slog (L_NOTICE, _("END status dump")); |
528 |
|
|
} |
529 |
|
|
|
530 |
|
|
vpn::vpn (void) |
531 |
pcg |
1.2 |
: event(this, &vpn::event_cb) |
532 |
|
|
, udpv4_ev_watcher(this, &vpn::udpv4_ev) |
533 |
|
|
, ipv4_ev_watcher (this, &vpn::ipv4_ev) |
534 |
|
|
, tap_ev_watcher (this, &vpn::tap_ev) |
535 |
|
|
#if ENABLE_TCP |
536 |
pcg |
1.3 |
, tcpv4_ev_watcher(this, &vpn::tcpv4_ev) |
537 |
pcg |
1.2 |
#endif |
538 |
pcg |
1.1 |
{ |
539 |
|
|
} |
540 |
|
|
|
541 |
|
|
vpn::~vpn () |
542 |
|
|
{ |
543 |
|
|
} |
544 |
|
|
|