1 | /* |
1 | /* |
2 | vpn.C -- handle the protocol, encryption, handshaking etc. |
2 | vpn.C -- handle the protocol, encryption, handshaking etc. |
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3 | Copyright (C) 2003-2008 Marc Lehmann <gvpe@schmorp.de> |
3 | |
4 | |
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5 | This file is part of GVPE. |
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6 | |
4 | This program is free software; you can redistribute it and/or modify |
7 | GVPE is free software; you can redistribute it and/or modify it |
5 | it under the terms of the GNU General Public License as published by |
8 | under the terms of the GNU General Public License as published by the |
6 | the Free Software Foundation; either version 2 of the License, or |
9 | Free Software Foundation; either version 3 of the License, or (at your |
7 | (at your option) any later version. |
10 | option) any later version. |
8 | |
11 | |
9 | This program is distributed in the hope that it will be useful, |
12 | This program is distributed in the hope that it will be useful, but |
10 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
13 | WITHOUT ANY WARRANTY; without even the implied warranty of |
11 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General |
12 | GNU General Public License for more details. |
15 | Public License for more details. |
13 | |
16 | |
14 | You should have received a copy of the GNU General Public License |
17 | You should have received a copy of the GNU General Public License along |
15 | along with this program; if not, write to the Free Software |
18 | with this program; if not, see <http://www.gnu.org/licenses/>. |
16 | Foundation, Inc. 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
19 | |
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20 | Additional permission under GNU GPL version 3 section 7 |
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21 | |
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22 | If you modify this Program, or any covered work, by linking or |
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23 | combining it with the OpenSSL project's OpenSSL library (or a modified |
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24 | version of that library), containing parts covered by the terms of the |
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25 | OpenSSL or SSLeay licenses, the licensors of this Program grant you |
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26 | additional permission to convey the resulting work. Corresponding |
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27 | Source for a non-source form of such a combination shall include the |
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28 | source code for the parts of OpenSSL used as well as that of the |
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29 | covered work. |
17 | */ |
30 | */ |
18 | |
31 | |
19 | #include "config.h" |
32 | #include "config.h" |
20 | |
33 | |
21 | #include <list> |
34 | #include <list> |
22 | |
35 | |
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36 | #include <cstdio> |
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37 | #include <cstring> |
23 | #include <cstdlib> |
38 | #include <cstdlib> |
24 | #include <cstring> |
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25 | #include <cstdio> |
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26 | |
39 | |
27 | #include <sys/types.h> |
40 | #include <sys/types.h> |
28 | #include <sys/socket.h> |
41 | #include <sys/socket.h> |
29 | #include <sys/poll.h> |
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30 | #include <sys/wait.h> |
42 | #include <sys/wait.h> |
31 | #include <errno.h> |
43 | #include <errno.h> |
32 | #include <time.h> |
44 | #include <time.h> |
33 | #include <unistd.h> |
45 | #include <unistd.h> |
34 | #include <fcntl.h> |
46 | #include <fcntl.h> |
35 | #include <sys/socket.h> |
47 | #include <sys/socket.h> |
36 | #include <netinet/in.h> |
48 | |
37 | #include <arpa/inet.h> |
49 | #include "netcompat.h" |
38 | #include <net/if.h> |
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39 | #ifdef HAVE_NETINET_IN_SYSTM_H |
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40 | # include <netinet/in_systm.h> |
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41 | #endif |
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42 | #ifdef HAVE_NETINET_IP_H |
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43 | # include <netinet/ip.h> |
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44 | #endif |
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45 | #ifdef HAVE_NETINET_TCP_H |
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46 | # include <netinet/tcp.h> |
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47 | #endif |
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48 | #if ENABLE_ICMP |
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49 | # include <netinet/ip_icmp.h> |
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50 | #endif |
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51 | |
50 | |
52 | #include "pidfile.h" |
51 | #include "pidfile.h" |
53 | |
52 | |
54 | #include "connection.h" |
53 | #include "connection.h" |
55 | #include "util.h" |
54 | #include "util.h" |
56 | #include "vpn.h" |
55 | #include "vpn.h" |
57 | |
56 | |
58 | #if !defined(SOL_IP) && defined(IPPROTO_IP) |
57 | vpn network; // THE vpn (bad design...) |
59 | # define SOL_IP IPPROTO_IP |
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60 | #endif |
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61 | |
58 | |
62 | ///////////////////////////////////////////////////////////////////////////// |
59 | ///////////////////////////////////////////////////////////////////////////// |
63 | |
60 | |
64 | const char *vpn::script_if_up () |
61 | static void inline |
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62 | set_tos (int fd, int &tos_prev, int tos) |
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63 | { |
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64 | #if defined(SOL_IP) && defined(IP_TOS) |
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65 | if (tos_prev == tos) |
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66 | return; |
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67 | |
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68 | tos_prev = tos; |
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69 | setsockopt (fd, SOL_IP, IP_TOS, &tos, sizeof tos); |
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70 | #endif |
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71 | } |
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72 | |
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73 | void |
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74 | vpn::script_init_env () |
65 | { |
75 | { |
66 | // the tunnel device mtu should be the physical mtu - overhead |
76 | // the tunnel device mtu should be the physical mtu - overhead |
67 | // the tricky part is rounding to the cipher key blocksize |
77 | // the tricky part is rounding to the cipher key blocksize |
68 | int mtu = conf.mtu - ETH_OVERHEAD - VPE_OVERHEAD - MAX_OVERHEAD; |
78 | int mtu = conf.mtu - ETH_OVERHEAD - VPE_OVERHEAD - MAX_OVERHEAD; |
69 | mtu += ETH_OVERHEAD - 6 - 6; // now we have the data portion |
79 | mtu += ETH_OVERHEAD - 6 - 6; // now we have the data portion |
70 | mtu -= mtu % EVP_CIPHER_block_size (CIPHER); // round |
80 | mtu -= mtu % EVP_CIPHER_block_size (CIPHER); // round |
71 | mtu -= ETH_OVERHEAD - 6 - 6; // and get interface mtu again |
81 | mtu -= ETH_OVERHEAD - 6 - 6; // and get interface mtu again |
72 | |
82 | |
73 | char *env; |
83 | char *env; |
74 | asprintf (&env, "CONFBASE=%s", confbase); |
84 | asprintf (&env, "CONFBASE=%s", confbase); putenv (env); |
75 | putenv (env); |
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76 | asprintf (&env, "NODENAME=%s", THISNODE->nodename); |
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77 | putenv (env); |
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78 | asprintf (&env, "NODEID=%d", THISNODE->id); |
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79 | putenv (env); |
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80 | asprintf (&env, "IFNAME=%s", tap->interface ()); |
85 | asprintf (&env, "IFNAME=%s", tap->interface ()); putenv (env); |
81 | putenv (env); |
86 | asprintf (&env, "IFTYPE=%s", IFTYPE); putenv (env); |
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87 | asprintf (&env, "IFSUBTYPE=%s", IFSUBTYPE); putenv (env); |
82 | asprintf (&env, "MTU=%d", mtu); |
88 | asprintf (&env, "MTU=%d", mtu); putenv (env); |
83 | putenv (env); |
89 | asprintf (&env, "NODES=%d", conns.size ()); putenv (env); |
84 | asprintf (&env, "MAC=%02x:%02x:%02x:%02x:%02x:%02x", |
90 | asprintf (&env, "NODEID=%d", THISNODE->id); putenv (env); |
85 | 0xfe, 0xfd, 0x80, 0x00, THISNODE->id >> 8, |
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86 | THISNODE->id & 0xff); |
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87 | putenv (env); |
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88 | |
91 | |
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92 | conns [THISNODE->id - 1]->script_init_env (""); |
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93 | |
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94 | for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c) |
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95 | { |
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96 | char ext[16]; |
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97 | snprintf (ext, 16, "_%d", (*c)->conf->id); |
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98 | (*c)->script_init_env (ext); |
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99 | } |
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100 | } |
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101 | |
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102 | inline const char * |
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103 | vpn::script_if_init () |
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104 | { |
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105 | script_init_env (); |
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106 | |
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107 | return tap->if_up (); |
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108 | } |
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109 | |
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110 | inline const char * |
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111 | vpn::script_if_up () |
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112 | { |
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113 | script_init_env (); |
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114 | |
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115 | char *filename; |
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116 | asprintf (&filename, |
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117 | "%s/%s", |
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118 | confbase, |
89 | return ::conf.script_if_up ? ::conf.script_if_up : "if-up"; |
119 | ::conf.script_if_up ? ::conf.script_if_up : "if-up"); |
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120 | |
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121 | return filename; |
90 | } |
122 | } |
91 | |
123 | |
92 | int |
124 | int |
93 | vpn::setup () |
125 | vpn::setup () |
94 | { |
126 | { |
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127 | ipv4_tos = -1; |
95 | ipv4_fd = -1; |
128 | ipv4_fd = -1; |
96 | |
129 | |
97 | if (THISNODE->protocols & PROT_IPv4 && ::conf.ip_proto) |
130 | if (THISNODE->protocols & PROT_IPv4 && ::conf.ip_proto) |
98 | { |
131 | { |
99 | ipv4_fd = socket (PF_INET, SOCK_RAW, ::conf.ip_proto); |
132 | ipv4_fd = socket (PF_INET, SOCK_RAW, ::conf.ip_proto); |
100 | |
133 | |
101 | if (ipv4_fd < 0) |
134 | if (ipv4_fd < 0) |
102 | return -1; |
135 | return -1; |
103 | |
136 | |
104 | fcntl (ipv4_fd, F_SETFL, O_NONBLOCK); |
137 | fcntl (ipv4_fd, F_SETFL, O_NONBLOCK); |
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138 | fcntl (ipv4_fd, F_SETFD, FD_CLOEXEC); |
105 | |
139 | |
106 | #if defined(SOL_IP) && defined(IP_MTU_DISCOVER) |
140 | #if defined(SOL_IP) && defined(IP_MTU_DISCOVER) |
107 | // this I really consider a linux bug. I am neither connected |
141 | // this I really consider a linux bug. I am neither connected |
108 | // nor do I fragment myself. Linux still sets DF and doesn't |
142 | // nor do I fragment myself. Linux still sets DF and doesn't |
109 | // fragment for me sometimes. |
143 | // fragment for me sometimes. |
… | |
… | |
116 | sockinfo si (THISNODE, PROT_IPv4); |
150 | sockinfo si (THISNODE, PROT_IPv4); |
117 | |
151 | |
118 | if (bind (ipv4_fd, si.sav4 (), si.salenv4 ())) |
152 | if (bind (ipv4_fd, si.sav4 (), si.salenv4 ())) |
119 | { |
153 | { |
120 | slog (L_ERR, _("can't bind ipv4 socket on %s: %s"), (const char *)si, strerror (errno)); |
154 | slog (L_ERR, _("can't bind ipv4 socket on %s: %s"), (const char *)si, strerror (errno)); |
121 | exit (1); |
155 | exit (EXIT_FAILURE); |
122 | } |
156 | } |
123 | |
157 | |
124 | ipv4_ev_watcher.start (ipv4_fd, POLLIN); |
158 | ipv4_ev_watcher.start (ipv4_fd, EV_READ); |
125 | } |
159 | } |
126 | |
160 | |
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161 | udpv4_tos = -1; |
127 | udpv4_fd = -1; |
162 | udpv4_fd = -1; |
128 | |
163 | |
129 | if (THISNODE->protocols & PROT_UDPv4 && THISNODE->udp_port) |
164 | if (THISNODE->protocols & PROT_UDPv4 && THISNODE->udp_port) |
130 | { |
165 | { |
131 | udpv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP); |
166 | udpv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP); |
132 | |
167 | |
133 | if (udpv4_fd < 0) |
168 | if (udpv4_fd < 0) |
134 | return -1; |
169 | return -1; |
135 | |
170 | |
136 | fcntl (udpv4_fd, F_SETFL, O_NONBLOCK); |
171 | fcntl (udpv4_fd, F_SETFL, O_NONBLOCK); |
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172 | fcntl (udpv4_fd, F_SETFD, FD_CLOEXEC); |
137 | |
173 | |
138 | // standard daemon practise... |
174 | // standard daemon practise... |
139 | { |
175 | { |
140 | int oval = 1; |
176 | int oval = 1; |
141 | setsockopt (udpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval); |
177 | setsockopt (udpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval); |
… | |
… | |
154 | sockinfo si (THISNODE, PROT_UDPv4); |
190 | sockinfo si (THISNODE, PROT_UDPv4); |
155 | |
191 | |
156 | if (bind (udpv4_fd, si.sav4 (), si.salenv4 ())) |
192 | if (bind (udpv4_fd, si.sav4 (), si.salenv4 ())) |
157 | { |
193 | { |
158 | slog (L_ERR, _("can't bind udpv4 on %s: %s"), (const char *)si, strerror (errno)); |
194 | slog (L_ERR, _("can't bind udpv4 on %s: %s"), (const char *)si, strerror (errno)); |
159 | exit (1); |
195 | exit (EXIT_FAILURE); |
160 | } |
196 | } |
161 | |
197 | |
162 | udpv4_ev_watcher.start (udpv4_fd, POLLIN); |
198 | udpv4_ev_watcher.start (udpv4_fd, EV_READ); |
163 | } |
199 | } |
164 | |
200 | |
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201 | icmpv4_tos = -1; |
165 | icmpv4_fd = -1; |
202 | icmpv4_fd = -1; |
166 | |
203 | |
167 | #if ENABLE_ICMP |
204 | #if ENABLE_ICMP |
168 | if (THISNODE->protocols & PROT_ICMPv4) |
205 | if (THISNODE->protocols & PROT_ICMPv4) |
169 | { |
206 | { |
170 | icmpv4_fd = socket (PF_INET, SOCK_RAW, IPPROTO_ICMP); |
207 | icmpv4_fd = socket (PF_INET, SOCK_RAW, IPPROTO_ICMP); |
171 | |
208 | |
172 | if (icmpv4_fd < 0) |
209 | if (icmpv4_fd < 0) |
173 | return -1; |
210 | return -1; |
174 | |
211 | |
175 | fcntl (icmpv4_fd, F_SETFL, O_NONBLOCK); |
212 | fcntl (icmpv4_fd, F_SETFL, O_NONBLOCK); |
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213 | fcntl (icmpv4_fd, F_SETFD, FD_CLOEXEC); |
176 | |
214 | |
177 | #ifdef ICMP_FILTER |
215 | #ifdef ICMP_FILTER |
178 | { |
216 | { |
179 | icmp_filter oval; |
217 | icmp_filter oval; |
180 | oval.data = 0xffffffff; |
218 | oval.data = 0xffffffff; |
… | |
… | |
189 | // this I really consider a linux bug. I am neither connected |
227 | // this I really consider a linux bug. I am neither connected |
190 | // nor do I fragment myself. Linux still sets DF and doesn't |
228 | // nor do I fragment myself. Linux still sets DF and doesn't |
191 | // fragment for me sometimes. |
229 | // fragment for me sometimes. |
192 | { |
230 | { |
193 | int oval = IP_PMTUDISC_DONT; |
231 | int oval = IP_PMTUDISC_DONT; |
194 | setsockopt (udpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval); |
232 | setsockopt (icmpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval); |
195 | } |
233 | } |
196 | #endif |
234 | #endif |
197 | |
235 | |
198 | sockinfo si (THISNODE, PROT_ICMPv4); |
236 | sockinfo si (THISNODE, PROT_ICMPv4); |
199 | |
237 | |
200 | if (bind (icmpv4_fd, si.sav4 (), si.salenv4 ())) |
238 | if (bind (icmpv4_fd, si.sav4 (), si.salenv4 ())) |
201 | { |
239 | { |
202 | slog (L_ERR, _("can't bind icmpv4 on %s: %s"), (const char *)si, strerror (errno)); |
240 | slog (L_ERR, _("can't bind icmpv4 on %s: %s"), (const char *)si, strerror (errno)); |
203 | exit (1); |
241 | exit (EXIT_FAILURE); |
204 | } |
242 | } |
205 | |
243 | |
206 | icmpv4_ev_watcher.start (icmpv4_fd, POLLIN); |
244 | icmpv4_ev_watcher.start (icmpv4_fd, EV_READ); |
207 | } |
245 | } |
208 | #endif |
246 | #endif |
209 | |
247 | |
210 | tcpv4_fd = -1; |
248 | tcpv4_fd = -1; |
211 | |
249 | |
… | |
… | |
216 | |
254 | |
217 | if (tcpv4_fd < 0) |
255 | if (tcpv4_fd < 0) |
218 | return -1; |
256 | return -1; |
219 | |
257 | |
220 | fcntl (tcpv4_fd, F_SETFL, O_NONBLOCK); |
258 | fcntl (tcpv4_fd, F_SETFL, O_NONBLOCK); |
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259 | fcntl (tcpv4_fd, F_SETFD, FD_CLOEXEC); |
221 | |
260 | |
222 | // standard daemon practise... |
261 | // standard daemon practise... |
223 | { |
262 | { |
224 | int oval = 1; |
263 | int oval = 1; |
225 | setsockopt (tcpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval); |
264 | setsockopt (tcpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval); |
… | |
… | |
228 | sockinfo si (THISNODE, PROT_TCPv4); |
267 | sockinfo si (THISNODE, PROT_TCPv4); |
229 | |
268 | |
230 | if (bind (tcpv4_fd, si.sav4 (), si.salenv4 ())) |
269 | if (bind (tcpv4_fd, si.sav4 (), si.salenv4 ())) |
231 | { |
270 | { |
232 | slog (L_ERR, _("can't bind tcpv4 on %s: %s"), (const char *)si, strerror (errno)); |
271 | slog (L_ERR, _("can't bind tcpv4 on %s: %s"), (const char *)si, strerror (errno)); |
233 | exit (1); |
272 | exit (EXIT_FAILURE); |
234 | } |
273 | } |
235 | |
274 | |
236 | if (listen (tcpv4_fd, 5)) |
275 | if (listen (tcpv4_fd, 5)) |
237 | { |
276 | { |
238 | slog (L_ERR, _("can't listen tcpv4 on %s: %s"), (const char *)si, strerror (errno)); |
277 | slog (L_ERR, _("can't listen tcpv4 on %s: %s"), (const char *)si, strerror (errno)); |
239 | exit (1); |
278 | exit (EXIT_FAILURE); |
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279 | } |
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280 | |
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281 | tcpv4_ev_watcher.start (tcpv4_fd, EV_READ); |
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282 | } |
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283 | #endif |
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284 | |
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285 | dnsv4_tos = -1; |
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286 | dnsv4_fd = -1; |
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287 | |
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288 | #if ENABLE_DNS |
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289 | if (THISNODE->protocols & PROT_DNSv4) |
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290 | { |
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291 | dns_forwarder.set (::conf.dns_forw_host, ::conf.dns_forw_port, PROT_DNSv4); |
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292 | |
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293 | dnsv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP); |
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294 | |
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295 | if (dnsv4_fd < 0) |
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296 | return -1; |
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297 | |
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298 | fcntl (dnsv4_fd, F_SETFL, O_NONBLOCK); |
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299 | fcntl (dnsv4_fd, F_SETFD, FD_CLOEXEC); |
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300 | |
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301 | # if defined(SOL_IP) && defined(IP_MTU_DISCOVER) |
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302 | // this I really consider a linux bug. I am neither connected |
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303 | // nor do I fragment myself. Linux still sets DF and doesn't |
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304 | // fragment for me sometimes. |
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305 | { |
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306 | int oval = IP_PMTUDISC_DONT; |
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307 | setsockopt (dnsv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval); |
240 | } |
308 | } |
241 | |
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242 | tcpv4_ev_watcher.start (tcpv4_fd, POLLIN); |
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243 | } |
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244 | #endif |
309 | # endif |
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310 | |
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311 | // standard daemon practise... |
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312 | { |
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313 | int oval = 1; |
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314 | setsockopt (dnsv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval); |
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315 | } |
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316 | |
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317 | sockinfo si (THISNODE->dns_hostname, |
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318 | THISNODE->dns_hostname ? THISNODE->dns_port : 0, |
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319 | PROT_DNSv4); |
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320 | |
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321 | if (bind (dnsv4_fd, si.sav4 (), si.salenv4 ())) |
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322 | { |
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323 | slog (L_ERR, _("can't bind dnsv4 on %s: %s"), (const char *)si, strerror (errno)); |
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324 | exit (EXIT_FAILURE); |
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325 | } |
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326 | |
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327 | dnsv4_ev_watcher.start (dnsv4_fd, EV_READ); |
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328 | } |
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329 | #endif |
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330 | |
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331 | ///////////////////////////////////////////////////////////////////////////// |
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332 | |
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333 | reconnect_all (); |
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334 | |
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335 | ///////////////////////////////////////////////////////////////////////////// |
245 | |
336 | |
246 | tap = new tap_device (); |
337 | tap = new tap_device (); |
247 | if (!tap) //D this, of course, never catches |
338 | if (!tap) //D this, of course, never catches |
248 | { |
339 | { |
249 | slog (L_ERR, _("cannot create network interface '%s'"), conf.ifname); |
340 | slog (L_ERR, _("cannot create network interface '%s'"), conf.ifname); |
250 | exit (1); |
341 | exit (EXIT_FAILURE); |
251 | } |
342 | } |
252 | |
343 | |
253 | run_script (run_script_cb (this, &vpn::script_if_up), true); |
344 | fcntl (tap->fd, F_SETFD, FD_CLOEXEC); |
254 | |
345 | |
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346 | run_script_cb cb; |
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347 | cb.set<vpn, &vpn::script_if_init> (this); |
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348 | |
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349 | if (tap->if_up () && |
|
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350 | !run_script (cb, true)) |
|
|
351 | { |
|
|
352 | slog (L_ERR, _("interface initialization command '%s' failed, exiting."), |
|
|
353 | tap->if_up ()); |
|
|
354 | exit (EXIT_FAILURE); |
|
|
355 | } |
|
|
356 | |
|
|
357 | cb.set<vpn, &vpn::script_if_up> (this); |
|
|
358 | if (!run_script (cb, true)) |
|
|
359 | { |
|
|
360 | slog (L_ERR, _("if-up command execution failed, exiting.")); |
|
|
361 | exit (EXIT_FAILURE); |
|
|
362 | } |
|
|
363 | |
255 | tap_ev_watcher.start (tap->fd, POLLIN); |
364 | tap_ev_watcher.start (tap->fd, EV_READ); |
256 | |
|
|
257 | reconnect_all (); |
|
|
258 | |
365 | |
259 | return 0; |
366 | return 0; |
260 | } |
|
|
261 | |
|
|
262 | // send a vpn packet out to other hosts |
|
|
263 | bool |
|
|
264 | vpn::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
|
|
265 | { |
|
|
266 | switch (si.prot) |
|
|
267 | { |
|
|
268 | case PROT_IPv4: |
|
|
269 | return send_ipv4_packet (pkt, si, tos); |
|
|
270 | |
|
|
271 | case PROT_UDPv4: |
|
|
272 | return send_udpv4_packet (pkt, si, tos); |
|
|
273 | |
|
|
274 | #if ENABLE_TCP |
|
|
275 | case PROT_TCPv4: |
|
|
276 | return send_tcpv4_packet (pkt, si, tos); |
|
|
277 | #endif |
|
|
278 | |
|
|
279 | #if ENABLE_ICMP |
|
|
280 | case PROT_ICMPv4: |
|
|
281 | return send_icmpv4_packet (pkt, si, tos); |
|
|
282 | #endif |
|
|
283 | |
|
|
284 | default: |
|
|
285 | slog (L_CRIT, _("%s: FATAL: trying to send packet with unsupported protocol"), (const char *)si); |
|
|
286 | return false; |
|
|
287 | } |
|
|
288 | } |
367 | } |
289 | |
368 | |
290 | bool |
369 | bool |
291 | vpn::send_ipv4_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
370 | vpn::send_ipv4_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
292 | { |
371 | { |
293 | #if defined(SOL_IP) && defined(IP_TOS) |
372 | set_tos (ipv4_fd, ipv4_tos, tos); |
294 | setsockopt (ipv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos); |
|
|
295 | #endif |
|
|
296 | sendto (ipv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ()); |
373 | sendto (ipv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ()); |
297 | |
374 | |
298 | return true; |
375 | return true; |
299 | } |
376 | } |
300 | |
377 | |
… | |
… | |
320 | |
397 | |
321 | return ~sum; |
398 | return ~sum; |
322 | } |
399 | } |
323 | |
400 | |
324 | #if ENABLE_ICMP |
401 | #if ENABLE_ICMP |
325 | struct icmp_header { |
|
|
326 | u8 type; |
|
|
327 | u8 code; |
|
|
328 | u16 checksum; |
|
|
329 | union { |
|
|
330 | struct { |
|
|
331 | u16 id; |
|
|
332 | u16 sequence; |
|
|
333 | } echo; |
|
|
334 | u32 gateway; |
|
|
335 | struct { |
|
|
336 | u16 unused; |
|
|
337 | u16 mtu; |
|
|
338 | } frag; |
|
|
339 | } un; |
|
|
340 | }; |
|
|
341 | |
|
|
342 | bool |
402 | bool |
343 | vpn::send_icmpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
403 | vpn::send_icmpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
344 | { |
404 | { |
345 | #if defined(SOL_IP) && defined(IP_TOS) |
|
|
346 | setsockopt (icmpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos); |
|
|
347 | #endif |
|
|
348 | |
|
|
349 | pkt->unshift_hdr (4); |
405 | pkt->unshift_hdr (4); |
350 | |
406 | |
351 | icmp_header *hdr = (icmp_header *)&((*pkt)[0]); |
407 | icmp_header *hdr = (icmp_header *)&((*pkt)[0]); |
352 | hdr->type = ::conf.icmp_type; |
408 | hdr->type = ::conf.icmp_type; |
353 | hdr->code = 255; |
409 | hdr->code = 255; |
354 | hdr->checksum = 0; |
410 | hdr->checksum = 0; |
355 | hdr->checksum = ipv4_checksum ((u16 *)hdr, pkt->len); |
411 | hdr->checksum = ipv4_checksum ((u16 *)hdr, pkt->len); |
356 | |
412 | |
|
|
413 | set_tos (icmpv4_fd, icmpv4_tos, tos); |
357 | sendto (icmpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ()); |
414 | sendto (icmpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ()); |
358 | |
415 | |
359 | return true; |
416 | return true; |
360 | } |
417 | } |
361 | #endif |
418 | #endif |
362 | |
419 | |
363 | bool |
420 | bool |
364 | vpn::send_udpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
421 | vpn::send_udpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
365 | { |
422 | { |
366 | #if defined(SOL_IP) && defined(IP_TOS) |
423 | set_tos (udpv4_fd, udpv4_tos, tos); |
367 | setsockopt (udpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos); |
|
|
368 | #endif |
|
|
369 | sendto (udpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ()); |
424 | sendto (udpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ()); |
370 | |
425 | |
371 | return true; |
426 | return true; |
|
|
427 | } |
|
|
428 | |
|
|
429 | void |
|
|
430 | vpn::inject_data_packet (tap_packet *pkt, int dst) |
|
|
431 | { |
|
|
432 | if (dst) |
|
|
433 | { |
|
|
434 | // unicast |
|
|
435 | if (dst != THISNODE->id) |
|
|
436 | conns[dst - 1]->inject_data_packet (pkt); |
|
|
437 | } |
|
|
438 | else |
|
|
439 | { |
|
|
440 | // broadcast, this is ugly, but due to the security policy |
|
|
441 | // we have to connect to all hosts... |
|
|
442 | for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c) |
|
|
443 | if ((*c)->conf != THISNODE) |
|
|
444 | (*c)->inject_data_packet (pkt); |
|
|
445 | } |
372 | } |
446 | } |
373 | |
447 | |
374 | void |
448 | void |
375 | vpn::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi) |
449 | vpn::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi) |
376 | { |
450 | { |
… | |
… | |
393 | connection *c = conns[src - 1]; |
467 | connection *c = conns[src - 1]; |
394 | |
468 | |
395 | if (dst == 0) |
469 | if (dst == 0) |
396 | slog (L_WARN, _("%s(%s): received broadcast (protocol violation)"), |
470 | slog (L_WARN, _("%s(%s): received broadcast (protocol violation)"), |
397 | c->conf->nodename, (const char *)rsi); |
471 | c->conf->nodename, (const char *)rsi); |
398 | else if (dst != 0 && dst != THISNODE->id) |
472 | else if (dst != THISNODE->id) |
399 | { |
473 | { |
400 | if (THISNODE->routerprio) |
474 | if (THISNODE->routerprio) |
401 | // the tos setting gets lost here. who cares. |
475 | // the tos setting gets lost here. who cares. |
402 | conns[dst - 1]->inject_vpn_packet (pkt); |
476 | conns[dst - 1]->inject_vpn_packet (pkt); |
403 | else |
477 | else |
… | |
… | |
409 | else |
483 | else |
410 | c->recv_vpn_packet (pkt, rsi); |
484 | c->recv_vpn_packet (pkt, rsi); |
411 | } |
485 | } |
412 | } |
486 | } |
413 | |
487 | |
414 | void |
488 | bool |
|
|
489 | vpn::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
|
|
490 | { |
|
|
491 | switch (si.prot) |
|
|
492 | { |
|
|
493 | case PROT_IPv4: |
|
|
494 | return send_ipv4_packet (pkt, si, tos); |
|
|
495 | |
|
|
496 | case PROT_UDPv4: |
|
|
497 | return send_udpv4_packet (pkt, si, tos); |
|
|
498 | |
|
|
499 | #if ENABLE_TCP |
|
|
500 | case PROT_TCPv4: |
|
|
501 | return send_tcpv4_packet (pkt, si, tos); |
|
|
502 | #endif |
|
|
503 | #if ENABLE_ICMP |
|
|
504 | case PROT_ICMPv4: |
|
|
505 | return send_icmpv4_packet (pkt, si, tos); |
|
|
506 | #endif |
|
|
507 | #if ENABLE_DNS |
|
|
508 | case PROT_DNSv4: |
|
|
509 | return send_dnsv4_packet (pkt, si, tos); |
|
|
510 | #endif |
|
|
511 | default: |
|
|
512 | slog (L_CRIT, _("%s: FATAL: trying to send packet with unsupported protocol"), (const char *)si); |
|
|
513 | } |
|
|
514 | |
|
|
515 | return false; |
|
|
516 | } |
|
|
517 | |
|
|
518 | inline void |
415 | vpn::ipv4_ev (io_watcher &w, short revents) |
519 | vpn::ipv4_ev (ev::io &w, int revents) |
416 | { |
520 | { |
417 | if (revents & (POLLIN | POLLERR)) |
521 | if (revents & EV_READ) |
418 | { |
522 | { |
419 | vpn_packet *pkt = new vpn_packet; |
523 | vpn_packet *pkt = new vpn_packet; |
420 | struct sockaddr_in sa; |
524 | struct sockaddr_in sa; |
421 | socklen_t sa_len = sizeof (sa); |
525 | socklen_t sa_len = sizeof (sa); |
422 | int len; |
526 | int len; |
… | |
… | |
427 | |
531 | |
428 | if (len > 0) |
532 | if (len > 0) |
429 | { |
533 | { |
430 | pkt->len = len; |
534 | pkt->len = len; |
431 | |
535 | |
432 | // raw sockets deliver the ipv4, but don't expect it on sends |
536 | // raw sockets deliver the ipv4 header, but don't expect it on sends |
433 | // this is slow, but... |
|
|
434 | pkt->skip_hdr (IP_OVERHEAD); |
537 | pkt->skip_hdr (IP_OVERHEAD); |
435 | |
538 | |
436 | recv_vpn_packet (pkt, si); |
539 | recv_vpn_packet (pkt, si); |
437 | } |
540 | } |
438 | else |
541 | else |
… | |
… | |
441 | slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno)); |
544 | slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno)); |
442 | } |
545 | } |
443 | |
546 | |
444 | delete pkt; |
547 | delete pkt; |
445 | } |
548 | } |
446 | else if (revents & POLLHUP) |
|
|
447 | { |
|
|
448 | // this cannot ;) happen on udp sockets |
|
|
449 | slog (L_ERR, _("FATAL: POLLHUP on ipv4 fd, terminating.")); |
|
|
450 | exit (1); |
|
|
451 | } |
|
|
452 | else |
549 | else |
453 | { |
550 | { |
454 | slog (L_ERR, |
551 | slog (L_ERR, |
455 | _("FATAL: unknown revents %08x in socket, terminating\n"), |
552 | _("FATAL: unknown revents %08x in socket, terminating\n"), |
456 | revents); |
553 | revents); |
457 | exit (1); |
554 | exit (EXIT_FAILURE); |
458 | } |
555 | } |
459 | } |
556 | } |
460 | |
557 | |
461 | #if ENABLE_ICMP |
558 | #if ENABLE_ICMP |
462 | void |
559 | inline void |
463 | vpn::icmpv4_ev (io_watcher &w, short revents) |
560 | vpn::icmpv4_ev (ev::io &w, int revents) |
464 | { |
561 | { |
465 | if (revents & (POLLIN | POLLERR)) |
562 | if (revents & EV_READ) |
466 | { |
563 | { |
467 | vpn_packet *pkt = new vpn_packet; |
564 | vpn_packet *pkt = new vpn_packet; |
468 | struct sockaddr_in sa; |
565 | struct sockaddr_in sa; |
469 | socklen_t sa_len = sizeof (sa); |
566 | socklen_t sa_len = sizeof (sa); |
470 | int len; |
567 | int len; |
… | |
… | |
495 | slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno)); |
592 | slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno)); |
496 | } |
593 | } |
497 | |
594 | |
498 | delete pkt; |
595 | delete pkt; |
499 | } |
596 | } |
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 |
597 | else |
507 | { |
598 | { |
508 | slog (L_ERR, |
599 | slog (L_ERR, |
509 | _("FATAL: unknown revents %08x in socket, terminating\n"), |
600 | _("FATAL: unknown revents %08x in socket, terminating\n"), |
510 | revents); |
601 | revents); |
511 | exit (1); |
602 | exit (EXIT_FAILURE); |
512 | } |
603 | } |
513 | } |
604 | } |
514 | #endif |
605 | #endif |
515 | |
606 | |
516 | void |
607 | inline void |
517 | vpn::udpv4_ev (io_watcher &w, short revents) |
608 | vpn::udpv4_ev (ev::io &w, int revents) |
518 | { |
609 | { |
519 | if (revents & (POLLIN | POLLERR)) |
610 | if (revents & EV_READ) |
520 | { |
611 | { |
521 | vpn_packet *pkt = new vpn_packet; |
612 | vpn_packet *pkt = new vpn_packet; |
522 | struct sockaddr_in sa; |
613 | struct sockaddr_in sa; |
523 | socklen_t sa_len = sizeof (sa); |
614 | socklen_t sa_len = sizeof (sa); |
524 | int len; |
615 | int len; |
… | |
… | |
539 | slog (L_DEBUG, _("%s: fd %d, %s"), (const char *)si, w.fd, strerror (errno)); |
630 | slog (L_DEBUG, _("%s: fd %d, %s"), (const char *)si, w.fd, strerror (errno)); |
540 | } |
631 | } |
541 | |
632 | |
542 | delete pkt; |
633 | delete pkt; |
543 | } |
634 | } |
544 | else if (revents & POLLHUP) |
|
|
545 | { |
|
|
546 | // this cannot ;) happen on udp sockets |
|
|
547 | slog (L_ERR, _("FATAL: POLLHUP on udp v4 fd, terminating.")); |
|
|
548 | exit (1); |
|
|
549 | } |
|
|
550 | else |
635 | else |
551 | { |
636 | { |
552 | slog (L_ERR, |
637 | slog (L_ERR, |
553 | _("FATAL: unknown revents %08x in socket, terminating\n"), |
638 | _("FATAL: unknown revents %08x in socket, terminating\n"), |
554 | revents); |
639 | revents); |
555 | exit (1); |
640 | exit (EXIT_FAILURE); |
556 | } |
641 | } |
557 | } |
642 | } |
558 | |
643 | |
559 | void |
644 | inline void |
560 | vpn::tap_ev (io_watcher &w, short revents) |
645 | vpn::tap_ev (ev::io &w, int revents) |
561 | { |
646 | { |
562 | if (revents & POLLIN) |
647 | if (revents & EV_READ) |
563 | { |
648 | { |
564 | /* process data */ |
649 | /* process data */ |
565 | tap_packet *pkt; |
650 | tap_packet *pkt; |
566 | |
651 | |
567 | pkt = tap->recv (); |
652 | pkt = tap->recv (); |
568 | |
653 | |
|
|
654 | if (!pkt) |
|
|
655 | return; |
|
|
656 | |
|
|
657 | if (pkt->len > 14) |
|
|
658 | { |
569 | int dst = mac2id (pkt->dst); |
659 | int dst = mac2id (pkt->dst); |
570 | int src = mac2id (pkt->src); |
660 | int src = mac2id (pkt->src); |
571 | |
661 | |
572 | if (src != THISNODE->id) |
662 | if (src != THISNODE->id) |
573 | { |
|
|
574 | slog (L_ERR, _("FATAL: tap packet not originating on current node received, exiting.")); |
|
|
575 | exit (1); |
|
|
576 | } |
|
|
577 | |
|
|
578 | if (dst == THISNODE->id) |
|
|
579 | { |
|
|
580 | slog (L_ERR, _("FATAL: tap packet destined for current node received, exiting.")); |
|
|
581 | 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 | { |
663 | { |
590 | // unicast |
664 | slog (L_ERR, _("FATAL: tap packet not originating on current node received (if-up script not working properly?), exiting.")); |
591 | if (dst != THISNODE->id) |
665 | exit (EXIT_FAILURE); |
592 | conns[dst - 1]->inject_data_packet (pkt); |
|
|
593 | } |
666 | } |
|
|
667 | |
|
|
668 | if (dst == THISNODE->id) |
|
|
669 | { |
|
|
670 | slog (L_ERR, _("FATAL: tap packet destined for current node received, exiting.")); |
|
|
671 | exit (EXIT_FAILURE); |
|
|
672 | } |
|
|
673 | |
|
|
674 | if (dst > conns.size ()) |
|
|
675 | slog (L_ERR, _("tap packet for unknown node %d received, ignoring."), dst); |
594 | else |
676 | else |
595 | { |
|
|
596 | // 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); |
677 | inject_data_packet (pkt, dst); |
601 | } |
|
|
602 | } |
678 | } |
603 | |
679 | |
604 | delete pkt; |
680 | 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 | } |
681 | } |
611 | else |
682 | else |
612 | abort (); |
683 | abort (); |
613 | } |
684 | } |
614 | |
685 | |
615 | void |
686 | inline void |
616 | vpn::event_cb (time_watcher &w) |
687 | vpn::event_cb (ev::timer &w, int) |
617 | { |
688 | { |
618 | if (events) |
689 | if (events) |
619 | { |
690 | { |
620 | if (events & EVENT_SHUTDOWN) |
691 | if (events & EVENT_SHUTDOWN) |
621 | { |
692 | { |
622 | slog (L_INFO, _("preparing shutdown...")); |
693 | slog (L_INFO, _("preparing shutdown...")); |
623 | |
694 | |
624 | shutdown_all (); |
695 | shutdown_all (); |
625 | |
|
|
626 | remove_pid (pidfilename); |
696 | remove_pid (conf.pidfilename); |
627 | |
|
|
628 | slog (L_INFO, _("terminating")); |
697 | slog (L_INFO, _("terminating")); |
629 | |
698 | exit (EXIT_SUCCESS); |
630 | exit (0); |
|
|
631 | } |
699 | } |
632 | |
700 | |
633 | if (events & EVENT_RECONNECT) |
701 | if (events & EVENT_RECONNECT) |
634 | { |
702 | { |
635 | slog (L_INFO, _("forced reconnect")); |
703 | slog (L_INFO, _("forced reconnect")); |
… | |
… | |
637 | reconnect_all (); |
705 | reconnect_all (); |
638 | } |
706 | } |
639 | |
707 | |
640 | events = 0; |
708 | events = 0; |
641 | } |
709 | } |
642 | |
|
|
643 | w.at = TSTAMP_CANCEL; |
|
|
644 | } |
710 | } |
645 | |
711 | |
646 | void |
712 | void |
647 | vpn::shutdown_all () |
713 | vpn::shutdown_all () |
648 | { |
714 | { |
… | |
… | |
661 | connection_init (); |
727 | connection_init (); |
662 | |
728 | |
663 | for (configuration::node_vector::iterator i = conf.nodes.begin (); |
729 | for (configuration::node_vector::iterator i = conf.nodes.begin (); |
664 | i != conf.nodes.end (); ++i) |
730 | i != conf.nodes.end (); ++i) |
665 | { |
731 | { |
666 | connection *conn = new connection (this); |
732 | connection *conn = new connection (this, *i); |
667 | |
|
|
668 | conn->conf = *i; |
|
|
669 | conns.push_back (conn); |
733 | conns.push_back (conn); |
670 | |
|
|
671 | conn->establish_connection (); |
734 | conn->establish_connection (); |
672 | } |
735 | } |
673 | } |
736 | } |
674 | |
737 | |
675 | connection *vpn::find_router () |
738 | connection *vpn::find_router () |
… | |
… | |
720 | } |
783 | } |
721 | |
784 | |
722 | void |
785 | void |
723 | vpn::dump_status () |
786 | vpn::dump_status () |
724 | { |
787 | { |
725 | slog (L_NOTICE, _("BEGIN status dump (%ld)"), (long)NOW); |
788 | slog (L_NOTICE, _("BEGIN status dump (%ld)"), (long)ev_now ()); |
726 | |
789 | |
727 | for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c) |
790 | for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c) |
728 | (*c)->dump_status (); |
791 | (*c)->dump_status (); |
729 | |
792 | |
730 | slog (L_NOTICE, _("END status dump")); |
793 | slog (L_NOTICE, _("END status dump")); |
731 | } |
794 | } |
732 | |
795 | |
733 | vpn::vpn (void) |
796 | vpn::vpn (void) |
|
|
797 | { |
734 | : event (this, &vpn::event_cb) |
798 | event .set<vpn, &vpn::event_cb > (this); |
735 | , udpv4_ev_watcher (this, &vpn::udpv4_ev) |
799 | udpv4_ev_watcher .set<vpn, &vpn::udpv4_ev > (this); |
736 | , ipv4_ev_watcher (this, &vpn::ipv4_ev) |
800 | ipv4_ev_watcher .set<vpn, &vpn::ipv4_ev > (this); |
737 | #if ENABLE_TCP |
801 | #if ENABLE_TCP |
738 | , tcpv4_ev_watcher (this, &vpn::tcpv4_ev) |
802 | tcpv4_ev_watcher .set<vpn, &vpn::tcpv4_ev > (this); |
739 | #endif |
803 | #endif |
740 | #if ENABLE_ICMP |
804 | #if ENABLE_ICMP |
741 | , icmpv4_ev_watcher(this, &vpn::icmpv4_ev) |
805 | icmpv4_ev_watcher.set<vpn, &vpn::icmpv4_ev> (this); |
742 | #endif |
806 | #endif |
743 | , tap_ev_watcher (this, &vpn::tap_ev) |
807 | #if ENABLE_DNS |
744 | { |
808 | dnsv4_ev_watcher .set<vpn, &vpn::dnsv4_ev > (this); |
|
|
809 | #endif |
|
|
810 | tap_ev_watcher .set<vpn, &vpn::tap_ev > (this); |
745 | } |
811 | } |
746 | |
812 | |
747 | vpn::~vpn () |
813 | vpn::~vpn () |
748 | { |
814 | { |
749 | } |
815 | } |