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" |
20 |
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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> |
32 |
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#include <time.h> |
33 |
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#include <unistd.h> |
34 |
pcg |
1.11 |
#include <fcntl.h> |
35 |
pcg |
1.9 |
#include <arpa/inet.h> |
36 |
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#include <netinet/in.h> |
37 |
pcg |
1.10 |
#include <netinet/ip_icmp.h> |
38 |
pcg |
1.1 |
|
39 |
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#include "pidfile.h" |
40 |
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41 |
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#include "connection.h" |
42 |
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#include "util.h" |
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#include "vpn.h" |
44 |
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45 |
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///////////////////////////////////////////////////////////////////////////// |
46 |
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|
47 |
pcg |
1.2 |
const char *vpn::script_if_up () |
48 |
pcg |
1.1 |
{ |
49 |
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// the tunnel device mtu should be the physical mtu - overhead |
50 |
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// the tricky part is rounding to the cipher key blocksize |
51 |
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int mtu = conf.mtu - ETH_OVERHEAD - VPE_OVERHEAD - MAX_OVERHEAD; |
52 |
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mtu += ETH_OVERHEAD - 6 - 6; // now we have the data portion |
53 |
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mtu -= mtu % EVP_CIPHER_block_size (CIPHER); // round |
54 |
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mtu -= ETH_OVERHEAD - 6 - 6; // and get interface mtu again |
55 |
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56 |
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char *env; |
57 |
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asprintf (&env, "CONFBASE=%s", confbase); |
58 |
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putenv (env); |
59 |
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asprintf (&env, "NODENAME=%s", THISNODE->nodename); |
60 |
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putenv (env); |
61 |
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asprintf (&env, "NODEID=%d", THISNODE->id); |
62 |
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putenv (env); |
63 |
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asprintf (&env, "IFNAME=%s", tap->interface ()); |
64 |
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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, |
69 |
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THISNODE->id & 0xff); |
70 |
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putenv (env); |
71 |
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72 |
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return ::conf.script_if_up ? ::conf.script_if_up : "if-up"; |
73 |
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} |
74 |
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75 |
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int |
76 |
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vpn::setup () |
77 |
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{ |
78 |
pcg |
1.8 |
ipv4_fd = -1; |
79 |
pcg |
1.1 |
|
80 |
pcg |
1.8 |
if (THISNODE->protocols & PROT_IPv4 && ::conf.ip_proto) |
81 |
pcg |
1.1 |
{ |
82 |
pcg |
1.8 |
ipv4_fd = socket (PF_INET, SOCK_RAW, ::conf.ip_proto); |
83 |
pcg |
1.1 |
|
84 |
pcg |
1.8 |
if (ipv4_fd < 0) |
85 |
pcg |
1.1 |
return -1; |
86 |
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|
87 |
pcg |
1.11 |
fcntl (ipv4_fd, F_SETFL, O_NONBLOCK); |
88 |
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89 |
pcg |
1.1 |
#ifdef IP_MTU_DISCOVER |
90 |
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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 |
92 |
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// fragment for me sometimes. |
93 |
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{ |
94 |
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int oval = IP_PMTUDISC_DONT; |
95 |
pcg |
1.8 |
setsockopt (ipv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval); |
96 |
pcg |
1.1 |
} |
97 |
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#endif |
98 |
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99 |
pcg |
1.9 |
sockinfo si (THISNODE, PROT_IPv4); |
100 |
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101 |
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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)); |
104 |
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exit (1); |
105 |
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} |
106 |
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107 |
pcg |
1.8 |
ipv4_ev_watcher.start (ipv4_fd, POLLIN); |
108 |
pcg |
1.1 |
} |
109 |
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110 |
pcg |
1.8 |
udpv4_fd = -1; |
111 |
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112 |
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if (THISNODE->protocols & PROT_UDPv4 && THISNODE->udp_port) |
113 |
pcg |
1.1 |
{ |
114 |
pcg |
1.8 |
udpv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP); |
115 |
pcg |
1.1 |
|
116 |
pcg |
1.8 |
if (udpv4_fd < 0) |
117 |
pcg |
1.1 |
return -1; |
118 |
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119 |
pcg |
1.11 |
fcntl (udpv4_fd, F_SETFL, O_NONBLOCK); |
120 |
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121 |
pcg |
1.8 |
// standard daemon practise... |
122 |
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{ |
123 |
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int oval = 1; |
124 |
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setsockopt (udpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval); |
125 |
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} |
126 |
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127 |
pcg |
1.9 |
#ifdef IP_MTU_DISCOVER |
128 |
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// this I really consider a linux bug. I am neither connected |
129 |
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// nor do I fragment myself. Linux still sets DF and doesn't |
130 |
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// fragment for me sometimes. |
131 |
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{ |
132 |
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int oval = IP_PMTUDISC_DONT; |
133 |
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setsockopt (udpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval); |
134 |
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} |
135 |
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#endif |
136 |
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137 |
pcg |
1.8 |
sockinfo si (THISNODE, PROT_UDPv4); |
138 |
pcg |
1.2 |
|
139 |
pcg |
1.8 |
if (bind (udpv4_fd, si.sav4 (), si.salenv4 ())) |
140 |
pcg |
1.1 |
{ |
141 |
pcg |
1.8 |
slog (L_ERR, _("can't bind udpv4 on %s: %s"), (const char *)si, strerror (errno)); |
142 |
pcg |
1.1 |
exit (1); |
143 |
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} |
144 |
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145 |
pcg |
1.9 |
udpv4_ev_watcher.start (udpv4_fd, POLLIN); |
146 |
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} |
147 |
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148 |
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icmpv4_fd = -1; |
149 |
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150 |
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#if ENABLE_ICMP |
151 |
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if (THISNODE->protocols & PROT_ICMPv4) |
152 |
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{ |
153 |
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icmpv4_fd = socket (PF_INET, SOCK_RAW, IPPROTO_ICMP); |
154 |
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155 |
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if (icmpv4_fd < 0) |
156 |
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return -1; |
157 |
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158 |
pcg |
1.11 |
fcntl (icmpv4_fd, F_SETFL, O_NONBLOCK); |
159 |
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160 |
pcg |
1.9 |
#ifdef ICMP_FILTER |
161 |
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{ |
162 |
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icmp_filter oval; |
163 |
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oval.data = 0xffffffff; |
164 |
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if (::conf.icmp_type < 32) |
165 |
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oval.data &= ~(1 << ::conf.icmp_type); |
166 |
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167 |
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setsockopt (icmpv4_fd, SOL_RAW, ICMP_FILTER, &oval, sizeof oval); |
168 |
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} |
169 |
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#endif |
170 |
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171 |
pcg |
1.1 |
#ifdef IP_MTU_DISCOVER |
172 |
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// this I really consider a linux bug. I am neither connected |
173 |
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// nor do I fragment myself. Linux still sets DF and doesn't |
174 |
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// fragment for me sometimes. |
175 |
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{ |
176 |
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int oval = IP_PMTUDISC_DONT; |
177 |
pcg |
1.8 |
setsockopt (udpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval); |
178 |
pcg |
1.1 |
} |
179 |
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#endif |
180 |
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181 |
pcg |
1.9 |
sockinfo si (THISNODE, PROT_ICMPv4); |
182 |
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183 |
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if (bind (icmpv4_fd, si.sav4 (), si.salenv4 ())) |
184 |
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{ |
185 |
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slog (L_ERR, _("can't bind icmpv4 on %s: %s"), (const char *)si, strerror (errno)); |
186 |
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exit (1); |
187 |
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} |
188 |
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189 |
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icmpv4_ev_watcher.start (icmpv4_fd, POLLIN); |
190 |
pcg |
1.1 |
} |
191 |
pcg |
1.9 |
#endif |
192 |
pcg |
1.1 |
|
193 |
pcg |
1.8 |
tcpv4_fd = -1; |
194 |
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|
195 |
pcg |
1.2 |
#if ENABLE_TCP |
196 |
pcg |
1.8 |
if (THISNODE->protocols & PROT_TCPv4 && THISNODE->tcp_port) |
197 |
pcg |
1.2 |
{ |
198 |
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tcpv4_fd = socket (PF_INET, SOCK_STREAM, IPPROTO_TCP); |
199 |
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200 |
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if (tcpv4_fd < 0) |
201 |
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return -1; |
202 |
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203 |
pcg |
1.11 |
fcntl (tcpv4_fd, F_SETFL, O_NONBLOCK); |
204 |
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205 |
pcg |
1.3 |
// standard daemon practise... |
206 |
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{ |
207 |
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int oval = 1; |
208 |
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setsockopt (tcpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval); |
209 |
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} |
210 |
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211 |
pcg |
1.2 |
sockinfo si (THISNODE, PROT_TCPv4); |
212 |
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213 |
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if (bind (tcpv4_fd, si.sav4 (), si.salenv4 ())) |
214 |
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{ |
215 |
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slog (L_ERR, _("can't bind tcpv4 on %s: %s"), (const char *)si, strerror (errno)); |
216 |
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exit (1); |
217 |
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} |
218 |
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219 |
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if (listen (tcpv4_fd, 5)) |
220 |
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{ |
221 |
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slog (L_ERR, _("can't listen tcpv4 on %s: %s"), (const char *)si, strerror (errno)); |
222 |
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exit (1); |
223 |
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} |
224 |
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|
225 |
pcg |
1.3 |
tcpv4_ev_watcher.start (tcpv4_fd, POLLIN); |
226 |
pcg |
1.2 |
} |
227 |
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#endif |
228 |
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229 |
pcg |
1.1 |
tap = new tap_device (); |
230 |
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if (!tap) //D this, of course, never catches |
231 |
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{ |
232 |
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slog (L_ERR, _("cannot create network interface '%s'"), conf.ifname); |
233 |
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exit (1); |
234 |
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} |
235 |
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236 |
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run_script (run_script_cb (this, &vpn::script_if_up), true); |
237 |
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238 |
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tap_ev_watcher.start (tap->fd, POLLIN); |
239 |
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240 |
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reconnect_all (); |
241 |
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242 |
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return 0; |
243 |
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} |
244 |
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|
245 |
pcg |
1.5 |
// send a vpn packet out to other hosts |
246 |
pcg |
1.7 |
bool |
247 |
pcg |
1.5 |
vpn::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
248 |
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{ |
249 |
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switch (si.prot) |
250 |
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{ |
251 |
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case PROT_IPv4: |
252 |
pcg |
1.7 |
return send_ipv4_packet (pkt, si, tos); |
253 |
pcg |
1.5 |
|
254 |
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case PROT_UDPv4: |
255 |
pcg |
1.7 |
return send_udpv4_packet (pkt, si, tos); |
256 |
pcg |
1.5 |
|
257 |
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#if ENABLE_TCP |
258 |
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case PROT_TCPv4: |
259 |
pcg |
1.7 |
return send_tcpv4_packet (pkt, si, tos); |
260 |
pcg |
1.5 |
#endif |
261 |
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|
262 |
pcg |
1.9 |
#if ENABLE_ICMP |
263 |
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case PROT_ICMPv4: |
264 |
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return send_icmpv4_packet (pkt, si, tos); |
265 |
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#endif |
266 |
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|
267 |
pcg |
1.5 |
default: |
268 |
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slog (L_CRIT, _("%s: FATAL: trying to send packet with unsupported protocol"), (const char *)si); |
269 |
pcg |
1.7 |
return false; |
270 |
pcg |
1.5 |
} |
271 |
|
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} |
272 |
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|
273 |
pcg |
1.7 |
bool |
274 |
pcg |
1.1 |
vpn::send_ipv4_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
275 |
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{ |
276 |
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setsockopt (ipv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos); |
277 |
|
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sendto (ipv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ()); |
278 |
pcg |
1.7 |
|
279 |
|
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return true; |
280 |
pcg |
1.1 |
} |
281 |
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|
282 |
pcg |
1.9 |
static u16 |
283 |
|
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ipv4_checksum (u16 *data, unsigned int len) |
284 |
|
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{ |
285 |
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// use 32 bit accumulator and fold back carry bits at the end |
286 |
|
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u32 sum = 0; |
287 |
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|
288 |
|
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while (len > 1) |
289 |
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{ |
290 |
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sum += *data++; |
291 |
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len -= 2; |
292 |
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} |
293 |
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|
294 |
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// odd byte left? |
295 |
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if (len) |
296 |
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sum += *(u8 *)data; |
297 |
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|
298 |
|
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// add back carry bits |
299 |
|
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sum = (sum >> 16) + (sum & 0xffff); // lo += hi |
300 |
|
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sum += (sum >> 16); // carry |
301 |
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|
302 |
|
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return ~sum; |
303 |
|
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} |
304 |
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|
305 |
|
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bool |
306 |
|
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vpn::send_icmpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
307 |
|
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{ |
308 |
|
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setsockopt (icmpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos); |
309 |
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|
310 |
|
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pkt->unshift_hdr (4); |
311 |
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|
312 |
|
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icmphdr *hdr = (icmphdr *)&((*pkt)[0]); |
313 |
|
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hdr->type = ::conf.icmp_type; |
314 |
|
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hdr->code = 255; |
315 |
|
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hdr->checksum = 0; |
316 |
|
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hdr->checksum = ipv4_checksum ((u16 *)hdr, pkt->len); |
317 |
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|
318 |
|
|
sendto (icmpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ()); |
319 |
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|
320 |
|
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return true; |
321 |
|
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} |
322 |
|
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|
323 |
pcg |
1.7 |
bool |
324 |
pcg |
1.1 |
vpn::send_udpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
325 |
|
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{ |
326 |
|
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setsockopt (udpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos); |
327 |
|
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sendto (udpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ()); |
328 |
pcg |
1.7 |
|
329 |
|
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return true; |
330 |
pcg |
1.1 |
} |
331 |
|
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|
332 |
|
|
void |
333 |
|
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vpn::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi) |
334 |
|
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{ |
335 |
|
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unsigned int src = pkt->src (); |
336 |
|
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unsigned int dst = pkt->dst (); |
337 |
|
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|
338 |
|
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slog (L_NOISE, _("<<?/%s received possible vpn packet type %d from %d to %d, length %d"), |
339 |
|
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(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst (), pkt->len); |
340 |
|
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|
341 |
|
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if (src == 0 || src > conns.size () |
342 |
|
|
|| dst > conns.size () |
343 |
|
|
|| pkt->typ () >= vpn_packet::PT_MAX) |
344 |
|
|
slog (L_WARN, _("(%s): received corrupted packet type %d (src %d, dst %d)"), |
345 |
|
|
(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ()); |
346 |
pcg |
1.6 |
else if (dst > conns.size ()) |
347 |
|
|
slog (L_WARN, _("(%s): received corrupted packet type %d (src %d, dst %d)"), |
348 |
|
|
(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ()); |
349 |
pcg |
1.1 |
else |
350 |
|
|
{ |
351 |
|
|
connection *c = conns[src - 1]; |
352 |
|
|
|
353 |
|
|
if (dst == 0 && !THISNODE->routerprio) |
354 |
|
|
slog (L_WARN, _("%s(%s): received broadcast, but we are no router"), |
355 |
|
|
c->conf->nodename, (const char *)rsi); |
356 |
|
|
else if (dst != 0 && dst != THISNODE->id) |
357 |
pcg |
1.6 |
{ |
358 |
|
|
if (THISNODE->routerprio) |
359 |
|
|
// the tos setting gets lost here. who cares. |
360 |
|
|
conns[dst - 1]->inject_vpn_packet (pkt); |
361 |
|
|
else |
362 |
|
|
slog (L_WARN, |
363 |
|
|
_("%s(%s): forwarding request (=> %s), but we are no router"), |
364 |
|
|
c->conf->nodename, (const char *)rsi, |
365 |
|
|
conns[dst - 1]->conf->nodename); |
366 |
|
|
} |
367 |
pcg |
1.1 |
else |
368 |
|
|
c->recv_vpn_packet (pkt, rsi); |
369 |
|
|
} |
370 |
|
|
} |
371 |
|
|
|
372 |
|
|
void |
373 |
pcg |
1.9 |
vpn::ipv4_ev (io_watcher &w, short revents) |
374 |
pcg |
1.1 |
{ |
375 |
|
|
if (revents & (POLLIN | POLLERR)) |
376 |
|
|
{ |
377 |
|
|
vpn_packet *pkt = new vpn_packet; |
378 |
|
|
struct sockaddr_in sa; |
379 |
|
|
socklen_t sa_len = sizeof (sa); |
380 |
|
|
int len; |
381 |
|
|
|
382 |
pcg |
1.5 |
len = recvfrom (w.fd, &((*pkt)[0]), MAXSIZE, 0, (sockaddr *)&sa, &sa_len); |
383 |
pcg |
1.1 |
|
384 |
pcg |
1.9 |
sockinfo si(sa, PROT_IPv4); |
385 |
pcg |
1.1 |
|
386 |
|
|
if (len > 0) |
387 |
|
|
{ |
388 |
|
|
pkt->len = len; |
389 |
|
|
|
390 |
pcg |
1.9 |
// raw sockets deliver the ipv4, but don't expect it on sends |
391 |
|
|
// this is slow, but... |
392 |
|
|
pkt->skip_hdr (IP_OVERHEAD); |
393 |
|
|
|
394 |
pcg |
1.1 |
recv_vpn_packet (pkt, si); |
395 |
|
|
} |
396 |
|
|
else |
397 |
|
|
{ |
398 |
|
|
// probably ECONNRESET or somesuch |
399 |
pcg |
1.9 |
slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno)); |
400 |
pcg |
1.1 |
} |
401 |
|
|
|
402 |
|
|
delete pkt; |
403 |
|
|
} |
404 |
|
|
else if (revents & POLLHUP) |
405 |
|
|
{ |
406 |
|
|
// this cannot ;) happen on udp sockets |
407 |
pcg |
1.9 |
slog (L_ERR, _("FATAL: POLLHUP on ipv4 fd, terminating.")); |
408 |
pcg |
1.1 |
exit (1); |
409 |
|
|
} |
410 |
|
|
else |
411 |
|
|
{ |
412 |
|
|
slog (L_ERR, |
413 |
|
|
_("FATAL: unknown revents %08x in socket, terminating\n"), |
414 |
|
|
revents); |
415 |
|
|
exit (1); |
416 |
|
|
} |
417 |
|
|
} |
418 |
|
|
|
419 |
|
|
void |
420 |
pcg |
1.9 |
vpn::icmpv4_ev (io_watcher &w, short revents) |
421 |
pcg |
1.1 |
{ |
422 |
|
|
if (revents & (POLLIN | POLLERR)) |
423 |
|
|
{ |
424 |
|
|
vpn_packet *pkt = new vpn_packet; |
425 |
|
|
struct sockaddr_in sa; |
426 |
|
|
socklen_t sa_len = sizeof (sa); |
427 |
|
|
int len; |
428 |
|
|
|
429 |
pcg |
1.5 |
len = recvfrom (w.fd, &((*pkt)[0]), MAXSIZE, 0, (sockaddr *)&sa, &sa_len); |
430 |
pcg |
1.1 |
|
431 |
pcg |
1.9 |
sockinfo si(sa, PROT_ICMPv4); |
432 |
pcg |
1.1 |
|
433 |
|
|
if (len > 0) |
434 |
|
|
{ |
435 |
|
|
pkt->len = len; |
436 |
|
|
|
437 |
pcg |
1.9 |
icmphdr *hdr = (icmphdr *)&((*pkt)[IP_OVERHEAD]); |
438 |
|
|
|
439 |
|
|
if (hdr->type == ::conf.icmp_type |
440 |
|
|
&& hdr->code == 255) |
441 |
|
|
{ |
442 |
|
|
// raw sockets deliver the ipv4, but don't expect it on sends |
443 |
|
|
// this is slow, but... |
444 |
|
|
pkt->skip_hdr (ICMP_OVERHEAD); |
445 |
|
|
|
446 |
|
|
recv_vpn_packet (pkt, si); |
447 |
|
|
} |
448 |
|
|
} |
449 |
|
|
else |
450 |
|
|
{ |
451 |
|
|
// probably ECONNRESET or somesuch |
452 |
|
|
slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno)); |
453 |
|
|
} |
454 |
|
|
|
455 |
|
|
delete pkt; |
456 |
|
|
} |
457 |
|
|
else if (revents & POLLHUP) |
458 |
|
|
{ |
459 |
|
|
// this cannot ;) happen on udp sockets |
460 |
|
|
slog (L_ERR, _("FATAL: POLLHUP on icmpv4 fd, terminating.")); |
461 |
|
|
exit (1); |
462 |
|
|
} |
463 |
|
|
else |
464 |
|
|
{ |
465 |
|
|
slog (L_ERR, |
466 |
|
|
_("FATAL: unknown revents %08x in socket, terminating\n"), |
467 |
|
|
revents); |
468 |
|
|
exit (1); |
469 |
|
|
} |
470 |
|
|
} |
471 |
|
|
|
472 |
|
|
void |
473 |
|
|
vpn::udpv4_ev (io_watcher &w, short revents) |
474 |
|
|
{ |
475 |
|
|
if (revents & (POLLIN | POLLERR)) |
476 |
|
|
{ |
477 |
|
|
vpn_packet *pkt = new vpn_packet; |
478 |
|
|
struct sockaddr_in sa; |
479 |
|
|
socklen_t sa_len = sizeof (sa); |
480 |
|
|
int len; |
481 |
|
|
|
482 |
|
|
len = recvfrom (w.fd, &((*pkt)[0]), MAXSIZE, 0, (sockaddr *)&sa, &sa_len); |
483 |
|
|
|
484 |
|
|
sockinfo si(sa, PROT_UDPv4); |
485 |
|
|
|
486 |
|
|
if (len > 0) |
487 |
|
|
{ |
488 |
|
|
pkt->len = len; |
489 |
pcg |
1.1 |
|
490 |
|
|
recv_vpn_packet (pkt, si); |
491 |
|
|
} |
492 |
|
|
else |
493 |
|
|
{ |
494 |
|
|
// probably ECONNRESET or somesuch |
495 |
pcg |
1.9 |
slog (L_DEBUG, _("%s: fd %d, %s"), (const char *)si, w.fd, strerror (errno)); |
496 |
pcg |
1.1 |
} |
497 |
|
|
|
498 |
|
|
delete pkt; |
499 |
|
|
} |
500 |
|
|
else if (revents & POLLHUP) |
501 |
|
|
{ |
502 |
|
|
// this cannot ;) happen on udp sockets |
503 |
pcg |
1.9 |
slog (L_ERR, _("FATAL: POLLHUP on udp v4 fd, terminating.")); |
504 |
pcg |
1.1 |
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 |
1.2 |
|
515 |
|
|
void |
516 |
pcg |
1.3 |
vpn::tap_ev (io_watcher &w, short revents) |
517 |
pcg |
1.1 |
{ |
518 |
|
|
if (revents & POLLIN) |
519 |
|
|
{ |
520 |
|
|
/* process data */ |
521 |
|
|
tap_packet *pkt; |
522 |
|
|
|
523 |
|
|
pkt = tap->recv (); |
524 |
|
|
|
525 |
|
|
int dst = mac2id (pkt->dst); |
526 |
|
|
int src = mac2id (pkt->src); |
527 |
|
|
|
528 |
|
|
if (src != THISNODE->id) |
529 |
|
|
{ |
530 |
|
|
slog (L_ERR, _("FATAL: tap packet not originating on current node received, terminating.")); |
531 |
|
|
exit (1); |
532 |
|
|
} |
533 |
|
|
|
534 |
|
|
if (dst == THISNODE->id) |
535 |
|
|
{ |
536 |
|
|
slog (L_ERR, _("FATAL: tap packet destined for current node received, terminating.")); |
537 |
|
|
exit (1); |
538 |
|
|
} |
539 |
|
|
|
540 |
|
|
if (dst > conns.size ()) |
541 |
|
|
slog (L_ERR, _("tap packet for unknown node %d received, ignoring."), dst); |
542 |
|
|
else |
543 |
|
|
{ |
544 |
|
|
if (dst) |
545 |
|
|
{ |
546 |
|
|
// unicast |
547 |
|
|
if (dst != THISNODE->id) |
548 |
|
|
conns[dst - 1]->inject_data_packet (pkt); |
549 |
|
|
} |
550 |
|
|
else |
551 |
|
|
{ |
552 |
|
|
// broadcast, first check router, then self, then english |
553 |
|
|
connection *router = find_router (); |
554 |
|
|
|
555 |
|
|
if (router) |
556 |
|
|
router->inject_data_packet (pkt, true); |
557 |
|
|
else |
558 |
|
|
for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c) |
559 |
|
|
if ((*c)->conf != THISNODE) |
560 |
|
|
(*c)->inject_data_packet (pkt); |
561 |
|
|
} |
562 |
|
|
} |
563 |
|
|
|
564 |
|
|
delete pkt; |
565 |
|
|
} |
566 |
|
|
else if (revents & (POLLHUP | POLLERR)) |
567 |
|
|
{ |
568 |
|
|
slog (L_ERR, _("FATAL: POLLHUP or POLLERR on network device fd, terminating.")); |
569 |
|
|
exit (1); |
570 |
|
|
} |
571 |
|
|
else |
572 |
|
|
abort (); |
573 |
|
|
} |
574 |
|
|
|
575 |
|
|
void |
576 |
pcg |
1.3 |
vpn::event_cb (time_watcher &w) |
577 |
pcg |
1.1 |
{ |
578 |
|
|
if (events) |
579 |
|
|
{ |
580 |
|
|
if (events & EVENT_SHUTDOWN) |
581 |
|
|
{ |
582 |
|
|
slog (L_INFO, _("preparing shutdown...")); |
583 |
|
|
|
584 |
|
|
shutdown_all (); |
585 |
|
|
|
586 |
|
|
remove_pid (pidfilename); |
587 |
|
|
|
588 |
|
|
slog (L_INFO, _("terminating")); |
589 |
|
|
|
590 |
|
|
exit (0); |
591 |
|
|
} |
592 |
|
|
|
593 |
|
|
if (events & EVENT_RECONNECT) |
594 |
|
|
{ |
595 |
|
|
slog (L_INFO, _("forced reconnect")); |
596 |
|
|
|
597 |
|
|
reconnect_all (); |
598 |
|
|
} |
599 |
|
|
|
600 |
|
|
events = 0; |
601 |
|
|
} |
602 |
|
|
|
603 |
pcg |
1.3 |
w.at = TSTAMP_CANCEL; |
604 |
pcg |
1.1 |
} |
605 |
|
|
|
606 |
|
|
void |
607 |
|
|
vpn::shutdown_all () |
608 |
|
|
{ |
609 |
|
|
for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c) |
610 |
|
|
(*c)->shutdown (); |
611 |
|
|
} |
612 |
|
|
|
613 |
|
|
void |
614 |
|
|
vpn::reconnect_all () |
615 |
|
|
{ |
616 |
|
|
for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c) |
617 |
|
|
delete *c; |
618 |
|
|
|
619 |
|
|
conns.clear (); |
620 |
|
|
|
621 |
|
|
connection_init (); |
622 |
|
|
|
623 |
|
|
for (configuration::node_vector::iterator i = conf.nodes.begin (); |
624 |
|
|
i != conf.nodes.end (); ++i) |
625 |
|
|
{ |
626 |
|
|
connection *conn = new connection (this); |
627 |
|
|
|
628 |
|
|
conn->conf = *i; |
629 |
|
|
conns.push_back (conn); |
630 |
|
|
|
631 |
|
|
conn->establish_connection (); |
632 |
|
|
} |
633 |
|
|
} |
634 |
|
|
|
635 |
|
|
connection *vpn::find_router () |
636 |
|
|
{ |
637 |
pcg |
1.12 |
u32 prio = 1; |
638 |
pcg |
1.1 |
connection *router = 0; |
639 |
|
|
|
640 |
|
|
for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i) |
641 |
|
|
{ |
642 |
|
|
connection *c = *i; |
643 |
|
|
|
644 |
pcg |
1.12 |
if (c->conf->routerprio >= prio |
645 |
pcg |
1.11 |
&& c->connectmode == conf_node::C_ALWAYS // so we don't drop the connection if in use |
646 |
|
|
&& c->ictx && c->octx |
647 |
|
|
&& c->conf != THISNODE // redundant, since ictx==octx==0 always on thisnode |
648 |
|
|
&& (!THISNODE->routerprio |
649 |
|
|
|| c->conf->routerprio <= THISNODE->routerprio)) |
650 |
pcg |
1.1 |
{ |
651 |
|
|
prio = c->conf->routerprio; |
652 |
|
|
router = c; |
653 |
|
|
} |
654 |
|
|
} |
655 |
|
|
|
656 |
|
|
return router; |
657 |
|
|
} |
658 |
|
|
|
659 |
pcg |
1.7 |
void vpn::send_connect_request (int id) |
660 |
pcg |
1.1 |
{ |
661 |
|
|
connection *c = find_router (); |
662 |
|
|
|
663 |
|
|
if (c) |
664 |
pcg |
1.7 |
c->send_connect_request (id); |
665 |
|
|
else |
666 |
|
|
// no router found, aggressively connect to all routers |
667 |
|
|
for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i) |
668 |
|
|
if ((*i)->conf->routerprio) |
669 |
|
|
(*i)->establish_connection (); |
670 |
pcg |
1.1 |
} |
671 |
|
|
|
672 |
|
|
void |
673 |
|
|
connection::dump_status () |
674 |
|
|
{ |
675 |
|
|
slog (L_NOTICE, _("node %s (id %d)"), conf->nodename, conf->id); |
676 |
|
|
slog (L_NOTICE, _(" connectmode %d (%d) / sockaddr %s / minor %d"), |
677 |
|
|
connectmode, conf->connectmode, (const char *)si, (int)prot_minor); |
678 |
|
|
slog (L_NOTICE, _(" ictx/octx %08lx/%08lx / oseqno %d / retry_cnt %d"), |
679 |
|
|
(long)ictx, (long)octx, (int)oseqno, (int)retry_cnt); |
680 |
|
|
slog (L_NOTICE, _(" establish_conn %ld / rekey %ld / keepalive %ld"), |
681 |
|
|
(long)(establish_connection.at), (long)(rekey.at), (long)(keepalive.at)); |
682 |
|
|
} |
683 |
|
|
|
684 |
|
|
void |
685 |
|
|
vpn::dump_status () |
686 |
|
|
{ |
687 |
|
|
slog (L_NOTICE, _("BEGIN status dump (%ld)"), (long)NOW); |
688 |
|
|
|
689 |
|
|
for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c) |
690 |
|
|
(*c)->dump_status (); |
691 |
|
|
|
692 |
|
|
slog (L_NOTICE, _("END status dump")); |
693 |
|
|
} |
694 |
|
|
|
695 |
|
|
vpn::vpn (void) |
696 |
pcg |
1.9 |
: event (this, &vpn::event_cb) |
697 |
|
|
, udpv4_ev_watcher (this, &vpn::udpv4_ev) |
698 |
|
|
, ipv4_ev_watcher (this, &vpn::ipv4_ev) |
699 |
pcg |
1.2 |
#if ENABLE_TCP |
700 |
pcg |
1.9 |
, tcpv4_ev_watcher (this, &vpn::tcpv4_ev) |
701 |
|
|
#endif |
702 |
|
|
#if ENABLE_ICMP |
703 |
|
|
, icmpv4_ev_watcher(this, &vpn::icmpv4_ev) |
704 |
pcg |
1.2 |
#endif |
705 |
pcg |
1.9 |
, tap_ev_watcher (this, &vpn::tap_ev) |
706 |
pcg |
1.1 |
{ |
707 |
|
|
} |
708 |
|
|
|
709 |
|
|
vpn::~vpn () |
710 |
|
|
{ |
711 |
|
|
} |
712 |
|
|
|