1 |
pcg |
1.1 |
/* |
2 |
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vpn.C -- handle the protocol, encryption, handshaking etc. |
3 |
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4 |
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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 <errno.h> |
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#include <time.h> |
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#include <unistd.h> |
34 |
pcg |
1.11 |
#include <fcntl.h> |
35 |
pcg |
1.14 |
#include <sys/socket.h> |
36 |
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#include <netinet/in.h> |
37 |
pcg |
1.9 |
#include <arpa/inet.h> |
38 |
pcg |
1.14 |
#include <net/if.h> |
39 |
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#ifdef HAVE_NETINET_IN_SYSTM_H |
40 |
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# include <netinet/in_systm.h> |
41 |
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#endif |
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#ifdef HAVE_NETINET_IP_H |
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# include <netinet/ip.h> |
44 |
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#endif |
45 |
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#ifdef HAVE_NETINET_TCP_H |
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# include <netinet/tcp.h> |
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#endif |
48 |
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#if ENABLE_ICMP |
49 |
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# include <netinet/ip_icmp.h> |
50 |
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#endif |
51 |
pcg |
1.1 |
|
52 |
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#include "pidfile.h" |
53 |
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54 |
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#include "connection.h" |
55 |
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#include "util.h" |
56 |
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#include "vpn.h" |
57 |
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58 |
pcg |
1.14 |
#if !defined(SOL_IP) && defined(IPPROTO_IP) |
59 |
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# define SOL_IP IPPROTO_IP |
60 |
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#endif |
61 |
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62 |
pcg |
1.1 |
///////////////////////////////////////////////////////////////////////////// |
63 |
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64 |
pcg |
1.2 |
const char *vpn::script_if_up () |
65 |
pcg |
1.1 |
{ |
66 |
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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; |
69 |
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mtu += ETH_OVERHEAD - 6 - 6; // now we have the data portion |
70 |
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mtu -= mtu % EVP_CIPHER_block_size (CIPHER); // round |
71 |
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mtu -= ETH_OVERHEAD - 6 - 6; // and get interface mtu again |
72 |
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73 |
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char *env; |
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asprintf (&env, "CONFBASE=%s", confbase); |
75 |
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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); |
79 |
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putenv (env); |
80 |
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asprintf (&env, "IFNAME=%s", tap->interface ()); |
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putenv (env); |
82 |
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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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89 |
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return ::conf.script_if_up ? ::conf.script_if_up : "if-up"; |
90 |
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} |
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92 |
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int |
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vpn::setup () |
94 |
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{ |
95 |
pcg |
1.8 |
ipv4_fd = -1; |
96 |
pcg |
1.1 |
|
97 |
pcg |
1.8 |
if (THISNODE->protocols & PROT_IPv4 && ::conf.ip_proto) |
98 |
pcg |
1.1 |
{ |
99 |
pcg |
1.8 |
ipv4_fd = socket (PF_INET, SOCK_RAW, ::conf.ip_proto); |
100 |
pcg |
1.1 |
|
101 |
pcg |
1.8 |
if (ipv4_fd < 0) |
102 |
pcg |
1.1 |
return -1; |
103 |
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104 |
pcg |
1.11 |
fcntl (ipv4_fd, F_SETFL, O_NONBLOCK); |
105 |
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106 |
pcg |
1.14 |
#if defined(SOL_IP) && defined(IP_MTU_DISCOVER) |
107 |
pcg |
1.1 |
// this I really consider a linux bug. I am neither connected |
108 |
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// nor do I fragment myself. Linux still sets DF and doesn't |
109 |
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// fragment for me sometimes. |
110 |
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{ |
111 |
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int oval = IP_PMTUDISC_DONT; |
112 |
pcg |
1.8 |
setsockopt (ipv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval); |
113 |
pcg |
1.1 |
} |
114 |
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#endif |
115 |
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116 |
pcg |
1.9 |
sockinfo si (THISNODE, PROT_IPv4); |
117 |
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118 |
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if (bind (ipv4_fd, si.sav4 (), si.salenv4 ())) |
119 |
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{ |
120 |
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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); |
122 |
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} |
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124 |
pcg |
1.8 |
ipv4_ev_watcher.start (ipv4_fd, POLLIN); |
125 |
pcg |
1.1 |
} |
126 |
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127 |
pcg |
1.8 |
udpv4_fd = -1; |
128 |
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129 |
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if (THISNODE->protocols & PROT_UDPv4 && THISNODE->udp_port) |
130 |
pcg |
1.1 |
{ |
131 |
pcg |
1.8 |
udpv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP); |
132 |
pcg |
1.1 |
|
133 |
pcg |
1.8 |
if (udpv4_fd < 0) |
134 |
pcg |
1.1 |
return -1; |
135 |
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136 |
pcg |
1.11 |
fcntl (udpv4_fd, F_SETFL, O_NONBLOCK); |
137 |
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138 |
pcg |
1.8 |
// standard daemon practise... |
139 |
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{ |
140 |
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int oval = 1; |
141 |
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setsockopt (udpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval); |
142 |
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} |
143 |
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144 |
pcg |
1.14 |
#if defined(SOL_IP) && defined(IP_MTU_DISCOVER) |
145 |
pcg |
1.9 |
// this I really consider a linux bug. I am neither connected |
146 |
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// nor do I fragment myself. Linux still sets DF and doesn't |
147 |
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// fragment for me sometimes. |
148 |
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{ |
149 |
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int oval = IP_PMTUDISC_DONT; |
150 |
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setsockopt (udpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval); |
151 |
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} |
152 |
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#endif |
153 |
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154 |
pcg |
1.8 |
sockinfo si (THISNODE, PROT_UDPv4); |
155 |
pcg |
1.2 |
|
156 |
pcg |
1.8 |
if (bind (udpv4_fd, si.sav4 (), si.salenv4 ())) |
157 |
pcg |
1.1 |
{ |
158 |
pcg |
1.8 |
slog (L_ERR, _("can't bind udpv4 on %s: %s"), (const char *)si, strerror (errno)); |
159 |
pcg |
1.1 |
exit (1); |
160 |
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} |
161 |
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162 |
pcg |
1.9 |
udpv4_ev_watcher.start (udpv4_fd, POLLIN); |
163 |
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} |
164 |
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165 |
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icmpv4_fd = -1; |
166 |
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167 |
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#if ENABLE_ICMP |
168 |
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if (THISNODE->protocols & PROT_ICMPv4) |
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{ |
170 |
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icmpv4_fd = socket (PF_INET, SOCK_RAW, IPPROTO_ICMP); |
171 |
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172 |
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if (icmpv4_fd < 0) |
173 |
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return -1; |
174 |
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175 |
pcg |
1.11 |
fcntl (icmpv4_fd, F_SETFL, O_NONBLOCK); |
176 |
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177 |
pcg |
1.9 |
#ifdef ICMP_FILTER |
178 |
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{ |
179 |
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icmp_filter oval; |
180 |
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oval.data = 0xffffffff; |
181 |
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if (::conf.icmp_type < 32) |
182 |
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oval.data &= ~(1 << ::conf.icmp_type); |
183 |
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184 |
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setsockopt (icmpv4_fd, SOL_RAW, ICMP_FILTER, &oval, sizeof oval); |
185 |
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} |
186 |
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#endif |
187 |
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188 |
pcg |
1.14 |
#if defined(SOL_IP) && defined(IP_MTU_DISCOVER) |
189 |
pcg |
1.1 |
// this I really consider a linux bug. I am neither connected |
190 |
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// nor do I fragment myself. Linux still sets DF and doesn't |
191 |
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// fragment for me sometimes. |
192 |
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{ |
193 |
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int oval = IP_PMTUDISC_DONT; |
194 |
pcg |
1.8 |
setsockopt (udpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval); |
195 |
pcg |
1.1 |
} |
196 |
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#endif |
197 |
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198 |
pcg |
1.9 |
sockinfo si (THISNODE, PROT_ICMPv4); |
199 |
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200 |
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if (bind (icmpv4_fd, si.sav4 (), si.salenv4 ())) |
201 |
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{ |
202 |
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slog (L_ERR, _("can't bind icmpv4 on %s: %s"), (const char *)si, strerror (errno)); |
203 |
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exit (1); |
204 |
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} |
205 |
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206 |
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icmpv4_ev_watcher.start (icmpv4_fd, POLLIN); |
207 |
pcg |
1.1 |
} |
208 |
pcg |
1.9 |
#endif |
209 |
pcg |
1.1 |
|
210 |
pcg |
1.8 |
tcpv4_fd = -1; |
211 |
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|
212 |
pcg |
1.2 |
#if ENABLE_TCP |
213 |
pcg |
1.8 |
if (THISNODE->protocols & PROT_TCPv4 && THISNODE->tcp_port) |
214 |
pcg |
1.2 |
{ |
215 |
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tcpv4_fd = socket (PF_INET, SOCK_STREAM, IPPROTO_TCP); |
216 |
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217 |
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if (tcpv4_fd < 0) |
218 |
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return -1; |
219 |
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220 |
pcg |
1.11 |
fcntl (tcpv4_fd, F_SETFL, O_NONBLOCK); |
221 |
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222 |
pcg |
1.3 |
// standard daemon practise... |
223 |
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{ |
224 |
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int oval = 1; |
225 |
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setsockopt (tcpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval); |
226 |
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} |
227 |
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228 |
pcg |
1.2 |
sockinfo si (THISNODE, PROT_TCPv4); |
229 |
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230 |
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if (bind (tcpv4_fd, si.sav4 (), si.salenv4 ())) |
231 |
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{ |
232 |
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slog (L_ERR, _("can't bind tcpv4 on %s: %s"), (const char *)si, strerror (errno)); |
233 |
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exit (1); |
234 |
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} |
235 |
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236 |
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if (listen (tcpv4_fd, 5)) |
237 |
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{ |
238 |
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slog (L_ERR, _("can't listen tcpv4 on %s: %s"), (const char *)si, strerror (errno)); |
239 |
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exit (1); |
240 |
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} |
241 |
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|
242 |
pcg |
1.3 |
tcpv4_ev_watcher.start (tcpv4_fd, POLLIN); |
243 |
pcg |
1.2 |
} |
244 |
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#endif |
245 |
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|
246 |
pcg |
1.1 |
tap = new tap_device (); |
247 |
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if (!tap) //D this, of course, never catches |
248 |
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{ |
249 |
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slog (L_ERR, _("cannot create network interface '%s'"), conf.ifname); |
250 |
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exit (1); |
251 |
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} |
252 |
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253 |
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run_script (run_script_cb (this, &vpn::script_if_up), true); |
254 |
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255 |
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tap_ev_watcher.start (tap->fd, POLLIN); |
256 |
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257 |
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reconnect_all (); |
258 |
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259 |
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return 0; |
260 |
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} |
261 |
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|
262 |
pcg |
1.5 |
// send a vpn packet out to other hosts |
263 |
pcg |
1.7 |
bool |
264 |
pcg |
1.5 |
vpn::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
265 |
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{ |
266 |
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switch (si.prot) |
267 |
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{ |
268 |
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case PROT_IPv4: |
269 |
pcg |
1.7 |
return send_ipv4_packet (pkt, si, tos); |
270 |
pcg |
1.5 |
|
271 |
|
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case PROT_UDPv4: |
272 |
pcg |
1.7 |
return send_udpv4_packet (pkt, si, tos); |
273 |
pcg |
1.5 |
|
274 |
|
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#if ENABLE_TCP |
275 |
|
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case PROT_TCPv4: |
276 |
pcg |
1.7 |
return send_tcpv4_packet (pkt, si, tos); |
277 |
pcg |
1.5 |
#endif |
278 |
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|
279 |
pcg |
1.9 |
#if ENABLE_ICMP |
280 |
|
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case PROT_ICMPv4: |
281 |
|
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return send_icmpv4_packet (pkt, si, tos); |
282 |
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#endif |
283 |
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|
284 |
pcg |
1.5 |
default: |
285 |
|
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slog (L_CRIT, _("%s: FATAL: trying to send packet with unsupported protocol"), (const char *)si); |
286 |
pcg |
1.7 |
return false; |
287 |
pcg |
1.5 |
} |
288 |
|
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} |
289 |
|
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|
290 |
pcg |
1.7 |
bool |
291 |
pcg |
1.1 |
vpn::send_ipv4_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
292 |
|
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{ |
293 |
pcg |
1.14 |
#if defined(SOL_IP) && defined(IP_TOS) |
294 |
pcg |
1.1 |
setsockopt (ipv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos); |
295 |
pcg |
1.14 |
#endif |
296 |
pcg |
1.1 |
sendto (ipv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ()); |
297 |
pcg |
1.7 |
|
298 |
|
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return true; |
299 |
pcg |
1.1 |
} |
300 |
|
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|
301 |
pcg |
1.9 |
static u16 |
302 |
|
|
ipv4_checksum (u16 *data, unsigned int len) |
303 |
|
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{ |
304 |
|
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// use 32 bit accumulator and fold back carry bits at the end |
305 |
|
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u32 sum = 0; |
306 |
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|
307 |
|
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while (len > 1) |
308 |
|
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{ |
309 |
|
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sum += *data++; |
310 |
|
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len -= 2; |
311 |
|
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} |
312 |
|
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|
313 |
|
|
// odd byte left? |
314 |
|
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if (len) |
315 |
|
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sum += *(u8 *)data; |
316 |
|
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|
317 |
|
|
// add back carry bits |
318 |
|
|
sum = (sum >> 16) + (sum & 0xffff); // lo += hi |
319 |
|
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sum += (sum >> 16); // carry |
320 |
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|
321 |
|
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return ~sum; |
322 |
|
|
} |
323 |
|
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|
324 |
pcg |
1.13 |
#if ENABLE_ICMP |
325 |
pcg |
1.14 |
struct icmp_header { |
326 |
|
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u8 type; |
327 |
|
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u8 code; |
328 |
|
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u16 checksum; |
329 |
|
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union { |
330 |
|
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struct { |
331 |
|
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u16 id; |
332 |
|
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u16 sequence; |
333 |
|
|
} echo; |
334 |
|
|
u32 gateway; |
335 |
|
|
struct { |
336 |
|
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u16 unused; |
337 |
|
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u16 mtu; |
338 |
|
|
} frag; |
339 |
|
|
} un; |
340 |
|
|
}; |
341 |
|
|
|
342 |
pcg |
1.9 |
bool |
343 |
|
|
vpn::send_icmpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
344 |
|
|
{ |
345 |
pcg |
1.14 |
#if defined(SOL_IP) && defined(IP_TOS) |
346 |
pcg |
1.9 |
setsockopt (icmpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos); |
347 |
pcg |
1.14 |
#endif |
348 |
pcg |
1.9 |
|
349 |
|
|
pkt->unshift_hdr (4); |
350 |
|
|
|
351 |
pcg |
1.14 |
icmp_header *hdr = (icmp_header *)&((*pkt)[0]); |
352 |
pcg |
1.9 |
hdr->type = ::conf.icmp_type; |
353 |
|
|
hdr->code = 255; |
354 |
|
|
hdr->checksum = 0; |
355 |
|
|
hdr->checksum = ipv4_checksum ((u16 *)hdr, pkt->len); |
356 |
|
|
|
357 |
|
|
sendto (icmpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ()); |
358 |
|
|
|
359 |
|
|
return true; |
360 |
|
|
} |
361 |
pcg |
1.13 |
#endif |
362 |
pcg |
1.9 |
|
363 |
pcg |
1.7 |
bool |
364 |
pcg |
1.1 |
vpn::send_udpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
365 |
|
|
{ |
366 |
pcg |
1.14 |
#if defined(SOL_IP) && defined(IP_TOS) |
367 |
pcg |
1.1 |
setsockopt (udpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos); |
368 |
pcg |
1.14 |
#endif |
369 |
pcg |
1.1 |
sendto (udpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ()); |
370 |
pcg |
1.7 |
|
371 |
|
|
return true; |
372 |
pcg |
1.1 |
} |
373 |
|
|
|
374 |
|
|
void |
375 |
|
|
vpn::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi) |
376 |
|
|
{ |
377 |
|
|
unsigned int src = pkt->src (); |
378 |
|
|
unsigned int dst = pkt->dst (); |
379 |
|
|
|
380 |
|
|
slog (L_NOISE, _("<<?/%s received possible vpn packet type %d from %d to %d, length %d"), |
381 |
|
|
(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst (), pkt->len); |
382 |
|
|
|
383 |
|
|
if (src == 0 || src > conns.size () |
384 |
|
|
|| dst > conns.size () |
385 |
|
|
|| pkt->typ () >= vpn_packet::PT_MAX) |
386 |
|
|
slog (L_WARN, _("(%s): received corrupted packet type %d (src %d, dst %d)"), |
387 |
|
|
(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ()); |
388 |
pcg |
1.6 |
else if (dst > conns.size ()) |
389 |
|
|
slog (L_WARN, _("(%s): received corrupted packet type %d (src %d, dst %d)"), |
390 |
|
|
(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ()); |
391 |
pcg |
1.1 |
else |
392 |
|
|
{ |
393 |
|
|
connection *c = conns[src - 1]; |
394 |
|
|
|
395 |
pcg |
1.13 |
if (dst == 0) |
396 |
|
|
slog (L_WARN, _("%s(%s): received broadcast (protocol violation)"), |
397 |
pcg |
1.1 |
c->conf->nodename, (const char *)rsi); |
398 |
|
|
else if (dst != 0 && dst != THISNODE->id) |
399 |
pcg |
1.6 |
{ |
400 |
|
|
if (THISNODE->routerprio) |
401 |
|
|
// the tos setting gets lost here. who cares. |
402 |
|
|
conns[dst - 1]->inject_vpn_packet (pkt); |
403 |
|
|
else |
404 |
|
|
slog (L_WARN, |
405 |
|
|
_("%s(%s): forwarding request (=> %s), but we are no router"), |
406 |
|
|
c->conf->nodename, (const char *)rsi, |
407 |
|
|
conns[dst - 1]->conf->nodename); |
408 |
|
|
} |
409 |
pcg |
1.1 |
else |
410 |
|
|
c->recv_vpn_packet (pkt, rsi); |
411 |
|
|
} |
412 |
|
|
} |
413 |
|
|
|
414 |
|
|
void |
415 |
pcg |
1.9 |
vpn::ipv4_ev (io_watcher &w, short revents) |
416 |
pcg |
1.1 |
{ |
417 |
|
|
if (revents & (POLLIN | POLLERR)) |
418 |
|
|
{ |
419 |
|
|
vpn_packet *pkt = new vpn_packet; |
420 |
|
|
struct sockaddr_in sa; |
421 |
|
|
socklen_t sa_len = sizeof (sa); |
422 |
|
|
int len; |
423 |
|
|
|
424 |
pcg |
1.5 |
len = recvfrom (w.fd, &((*pkt)[0]), MAXSIZE, 0, (sockaddr *)&sa, &sa_len); |
425 |
pcg |
1.1 |
|
426 |
pcg |
1.9 |
sockinfo si(sa, PROT_IPv4); |
427 |
pcg |
1.1 |
|
428 |
|
|
if (len > 0) |
429 |
|
|
{ |
430 |
|
|
pkt->len = len; |
431 |
|
|
|
432 |
pcg |
1.9 |
// raw sockets deliver the ipv4, but don't expect it on sends |
433 |
|
|
// this is slow, but... |
434 |
|
|
pkt->skip_hdr (IP_OVERHEAD); |
435 |
|
|
|
436 |
pcg |
1.1 |
recv_vpn_packet (pkt, si); |
437 |
|
|
} |
438 |
|
|
else |
439 |
|
|
{ |
440 |
|
|
// probably ECONNRESET or somesuch |
441 |
pcg |
1.9 |
slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno)); |
442 |
pcg |
1.1 |
} |
443 |
|
|
|
444 |
|
|
delete pkt; |
445 |
|
|
} |
446 |
|
|
else if (revents & POLLHUP) |
447 |
|
|
{ |
448 |
|
|
// this cannot ;) happen on udp sockets |
449 |
pcg |
1.9 |
slog (L_ERR, _("FATAL: POLLHUP on ipv4 fd, terminating.")); |
450 |
pcg |
1.1 |
exit (1); |
451 |
|
|
} |
452 |
|
|
else |
453 |
|
|
{ |
454 |
|
|
slog (L_ERR, |
455 |
|
|
_("FATAL: unknown revents %08x in socket, terminating\n"), |
456 |
|
|
revents); |
457 |
|
|
exit (1); |
458 |
|
|
} |
459 |
|
|
} |
460 |
|
|
|
461 |
pcg |
1.13 |
#if ENABLE_ICMP |
462 |
pcg |
1.1 |
void |
463 |
pcg |
1.9 |
vpn::icmpv4_ev (io_watcher &w, short revents) |
464 |
pcg |
1.1 |
{ |
465 |
|
|
if (revents & (POLLIN | POLLERR)) |
466 |
|
|
{ |
467 |
|
|
vpn_packet *pkt = new vpn_packet; |
468 |
|
|
struct sockaddr_in sa; |
469 |
|
|
socklen_t sa_len = sizeof (sa); |
470 |
|
|
int len; |
471 |
|
|
|
472 |
pcg |
1.5 |
len = recvfrom (w.fd, &((*pkt)[0]), MAXSIZE, 0, (sockaddr *)&sa, &sa_len); |
473 |
pcg |
1.1 |
|
474 |
pcg |
1.9 |
sockinfo si(sa, PROT_ICMPv4); |
475 |
pcg |
1.1 |
|
476 |
|
|
if (len > 0) |
477 |
|
|
{ |
478 |
|
|
pkt->len = len; |
479 |
|
|
|
480 |
pcg |
1.14 |
icmp_header *hdr = (icmp_header *)&((*pkt)[IP_OVERHEAD]); |
481 |
pcg |
1.9 |
|
482 |
|
|
if (hdr->type == ::conf.icmp_type |
483 |
|
|
&& hdr->code == 255) |
484 |
|
|
{ |
485 |
|
|
// raw sockets deliver the ipv4, but don't expect it on sends |
486 |
|
|
// this is slow, but... |
487 |
|
|
pkt->skip_hdr (ICMP_OVERHEAD); |
488 |
|
|
|
489 |
|
|
recv_vpn_packet (pkt, si); |
490 |
|
|
} |
491 |
|
|
} |
492 |
|
|
else |
493 |
|
|
{ |
494 |
|
|
// probably ECONNRESET or somesuch |
495 |
|
|
slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno)); |
496 |
|
|
} |
497 |
|
|
|
498 |
|
|
delete pkt; |
499 |
|
|
} |
500 |
|
|
else if (revents & POLLHUP) |
501 |
|
|
{ |
502 |
|
|
// this cannot ;) happen on udp sockets |
503 |
|
|
slog (L_ERR, _("FATAL: POLLHUP on icmpv4 fd, terminating.")); |
504 |
|
|
exit (1); |
505 |
|
|
} |
506 |
|
|
else |
507 |
|
|
{ |
508 |
|
|
slog (L_ERR, |
509 |
|
|
_("FATAL: unknown revents %08x in socket, terminating\n"), |
510 |
|
|
revents); |
511 |
|
|
exit (1); |
512 |
|
|
} |
513 |
|
|
} |
514 |
pcg |
1.13 |
#endif |
515 |
pcg |
1.9 |
|
516 |
|
|
void |
517 |
|
|
vpn::udpv4_ev (io_watcher &w, short revents) |
518 |
|
|
{ |
519 |
|
|
if (revents & (POLLIN | POLLERR)) |
520 |
|
|
{ |
521 |
|
|
vpn_packet *pkt = new vpn_packet; |
522 |
|
|
struct sockaddr_in sa; |
523 |
|
|
socklen_t sa_len = sizeof (sa); |
524 |
|
|
int len; |
525 |
|
|
|
526 |
|
|
len = recvfrom (w.fd, &((*pkt)[0]), MAXSIZE, 0, (sockaddr *)&sa, &sa_len); |
527 |
|
|
|
528 |
|
|
sockinfo si(sa, PROT_UDPv4); |
529 |
|
|
|
530 |
|
|
if (len > 0) |
531 |
|
|
{ |
532 |
|
|
pkt->len = len; |
533 |
pcg |
1.1 |
|
534 |
|
|
recv_vpn_packet (pkt, si); |
535 |
|
|
} |
536 |
|
|
else |
537 |
|
|
{ |
538 |
|
|
// probably ECONNRESET or somesuch |
539 |
pcg |
1.9 |
slog (L_DEBUG, _("%s: fd %d, %s"), (const char *)si, w.fd, strerror (errno)); |
540 |
pcg |
1.1 |
} |
541 |
|
|
|
542 |
|
|
delete pkt; |
543 |
|
|
} |
544 |
|
|
else if (revents & POLLHUP) |
545 |
|
|
{ |
546 |
|
|
// this cannot ;) happen on udp sockets |
547 |
pcg |
1.9 |
slog (L_ERR, _("FATAL: POLLHUP on udp v4 fd, terminating.")); |
548 |
pcg |
1.1 |
exit (1); |
549 |
|
|
} |
550 |
|
|
else |
551 |
|
|
{ |
552 |
|
|
slog (L_ERR, |
553 |
|
|
_("FATAL: unknown revents %08x in socket, terminating\n"), |
554 |
|
|
revents); |
555 |
|
|
exit (1); |
556 |
|
|
} |
557 |
|
|
} |
558 |
pcg |
1.2 |
|
559 |
|
|
void |
560 |
pcg |
1.3 |
vpn::tap_ev (io_watcher &w, short revents) |
561 |
pcg |
1.1 |
{ |
562 |
|
|
if (revents & POLLIN) |
563 |
|
|
{ |
564 |
|
|
/* process data */ |
565 |
|
|
tap_packet *pkt; |
566 |
|
|
|
567 |
|
|
pkt = tap->recv (); |
568 |
|
|
|
569 |
|
|
int dst = mac2id (pkt->dst); |
570 |
|
|
int src = mac2id (pkt->src); |
571 |
|
|
|
572 |
|
|
if (src != THISNODE->id) |
573 |
|
|
{ |
574 |
pcg |
1.14 |
slog (L_ERR, _("FATAL: tap packet not originating on current node received, exiting.")); |
575 |
pcg |
1.1 |
exit (1); |
576 |
|
|
} |
577 |
|
|
|
578 |
|
|
if (dst == THISNODE->id) |
579 |
|
|
{ |
580 |
pcg |
1.14 |
slog (L_ERR, _("FATAL: tap packet destined for current node received, exiting.")); |
581 |
pcg |
1.1 |
exit (1); |
582 |
|
|
} |
583 |
|
|
|
584 |
|
|
if (dst > conns.size ()) |
585 |
|
|
slog (L_ERR, _("tap packet for unknown node %d received, ignoring."), dst); |
586 |
|
|
else |
587 |
|
|
{ |
588 |
|
|
if (dst) |
589 |
|
|
{ |
590 |
|
|
// unicast |
591 |
|
|
if (dst != THISNODE->id) |
592 |
|
|
conns[dst - 1]->inject_data_packet (pkt); |
593 |
|
|
} |
594 |
|
|
else |
595 |
|
|
{ |
596 |
pcg |
1.13 |
// broadcast, this is ugly, but due to the security policy |
597 |
|
|
// we have to connect to all hosts... |
598 |
|
|
for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c) |
599 |
|
|
if ((*c)->conf != THISNODE) |
600 |
|
|
(*c)->inject_data_packet (pkt); |
601 |
pcg |
1.1 |
} |
602 |
|
|
} |
603 |
|
|
|
604 |
|
|
delete pkt; |
605 |
|
|
} |
606 |
|
|
else if (revents & (POLLHUP | POLLERR)) |
607 |
|
|
{ |
608 |
|
|
slog (L_ERR, _("FATAL: POLLHUP or POLLERR on network device fd, terminating.")); |
609 |
|
|
exit (1); |
610 |
|
|
} |
611 |
|
|
else |
612 |
|
|
abort (); |
613 |
|
|
} |
614 |
|
|
|
615 |
|
|
void |
616 |
pcg |
1.3 |
vpn::event_cb (time_watcher &w) |
617 |
pcg |
1.1 |
{ |
618 |
|
|
if (events) |
619 |
|
|
{ |
620 |
|
|
if (events & EVENT_SHUTDOWN) |
621 |
|
|
{ |
622 |
|
|
slog (L_INFO, _("preparing shutdown...")); |
623 |
|
|
|
624 |
|
|
shutdown_all (); |
625 |
|
|
|
626 |
|
|
remove_pid (pidfilename); |
627 |
|
|
|
628 |
|
|
slog (L_INFO, _("terminating")); |
629 |
|
|
|
630 |
|
|
exit (0); |
631 |
|
|
} |
632 |
|
|
|
633 |
|
|
if (events & EVENT_RECONNECT) |
634 |
|
|
{ |
635 |
|
|
slog (L_INFO, _("forced reconnect")); |
636 |
|
|
|
637 |
|
|
reconnect_all (); |
638 |
|
|
} |
639 |
|
|
|
640 |
|
|
events = 0; |
641 |
|
|
} |
642 |
|
|
|
643 |
pcg |
1.3 |
w.at = TSTAMP_CANCEL; |
644 |
pcg |
1.1 |
} |
645 |
|
|
|
646 |
|
|
void |
647 |
|
|
vpn::shutdown_all () |
648 |
|
|
{ |
649 |
|
|
for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c) |
650 |
|
|
(*c)->shutdown (); |
651 |
|
|
} |
652 |
|
|
|
653 |
|
|
void |
654 |
|
|
vpn::reconnect_all () |
655 |
|
|
{ |
656 |
|
|
for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c) |
657 |
|
|
delete *c; |
658 |
|
|
|
659 |
|
|
conns.clear (); |
660 |
|
|
|
661 |
|
|
connection_init (); |
662 |
|
|
|
663 |
|
|
for (configuration::node_vector::iterator i = conf.nodes.begin (); |
664 |
|
|
i != conf.nodes.end (); ++i) |
665 |
|
|
{ |
666 |
|
|
connection *conn = new connection (this); |
667 |
|
|
|
668 |
|
|
conn->conf = *i; |
669 |
|
|
conns.push_back (conn); |
670 |
|
|
|
671 |
|
|
conn->establish_connection (); |
672 |
|
|
} |
673 |
|
|
} |
674 |
|
|
|
675 |
|
|
connection *vpn::find_router () |
676 |
|
|
{ |
677 |
pcg |
1.12 |
u32 prio = 1; |
678 |
pcg |
1.1 |
connection *router = 0; |
679 |
|
|
|
680 |
|
|
for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i) |
681 |
|
|
{ |
682 |
|
|
connection *c = *i; |
683 |
|
|
|
684 |
pcg |
1.13 |
if (c->conf->routerprio > prio |
685 |
pcg |
1.11 |
&& c->connectmode == conf_node::C_ALWAYS // so we don't drop the connection if in use |
686 |
|
|
&& c->ictx && c->octx |
687 |
pcg |
1.13 |
&& c->conf != THISNODE) // redundant, since ictx==octx==0 always on thisnode |
688 |
pcg |
1.1 |
{ |
689 |
|
|
prio = c->conf->routerprio; |
690 |
|
|
router = c; |
691 |
|
|
} |
692 |
|
|
} |
693 |
|
|
|
694 |
|
|
return router; |
695 |
|
|
} |
696 |
|
|
|
697 |
pcg |
1.7 |
void vpn::send_connect_request (int id) |
698 |
pcg |
1.1 |
{ |
699 |
|
|
connection *c = find_router (); |
700 |
|
|
|
701 |
|
|
if (c) |
702 |
pcg |
1.7 |
c->send_connect_request (id); |
703 |
|
|
else |
704 |
|
|
// no router found, aggressively connect to all routers |
705 |
|
|
for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i) |
706 |
pcg |
1.13 |
if ((*i)->conf->routerprio && (*i)->conf != THISNODE) |
707 |
pcg |
1.7 |
(*i)->establish_connection (); |
708 |
pcg |
1.1 |
} |
709 |
|
|
|
710 |
|
|
void |
711 |
|
|
connection::dump_status () |
712 |
|
|
{ |
713 |
|
|
slog (L_NOTICE, _("node %s (id %d)"), conf->nodename, conf->id); |
714 |
|
|
slog (L_NOTICE, _(" connectmode %d (%d) / sockaddr %s / minor %d"), |
715 |
|
|
connectmode, conf->connectmode, (const char *)si, (int)prot_minor); |
716 |
|
|
slog (L_NOTICE, _(" ictx/octx %08lx/%08lx / oseqno %d / retry_cnt %d"), |
717 |
|
|
(long)ictx, (long)octx, (int)oseqno, (int)retry_cnt); |
718 |
|
|
slog (L_NOTICE, _(" establish_conn %ld / rekey %ld / keepalive %ld"), |
719 |
|
|
(long)(establish_connection.at), (long)(rekey.at), (long)(keepalive.at)); |
720 |
|
|
} |
721 |
|
|
|
722 |
|
|
void |
723 |
|
|
vpn::dump_status () |
724 |
|
|
{ |
725 |
|
|
slog (L_NOTICE, _("BEGIN status dump (%ld)"), (long)NOW); |
726 |
|
|
|
727 |
|
|
for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c) |
728 |
|
|
(*c)->dump_status (); |
729 |
|
|
|
730 |
|
|
slog (L_NOTICE, _("END status dump")); |
731 |
|
|
} |
732 |
|
|
|
733 |
|
|
vpn::vpn (void) |
734 |
pcg |
1.9 |
: event (this, &vpn::event_cb) |
735 |
|
|
, udpv4_ev_watcher (this, &vpn::udpv4_ev) |
736 |
|
|
, ipv4_ev_watcher (this, &vpn::ipv4_ev) |
737 |
pcg |
1.2 |
#if ENABLE_TCP |
738 |
pcg |
1.9 |
, tcpv4_ev_watcher (this, &vpn::tcpv4_ev) |
739 |
|
|
#endif |
740 |
|
|
#if ENABLE_ICMP |
741 |
|
|
, icmpv4_ev_watcher(this, &vpn::icmpv4_ev) |
742 |
pcg |
1.2 |
#endif |
743 |
pcg |
1.9 |
, tap_ev_watcher (this, &vpn::tap_ev) |
744 |
pcg |
1.1 |
{ |
745 |
|
|
} |
746 |
|
|
|
747 |
|
|
vpn::~vpn () |
748 |
|
|
{ |
749 |
|
|
} |
750 |
|
|
|