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) 2003-2005 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 |
5 | it under the terms of the GNU General Public License as published by |
8 | it under the terms of the GNU General Public License as published by |
6 | the Free Software Foundation; either version 2 of the License, or |
9 | the Free Software Foundation; either version 2 of the License, or |
7 | (at your option) any later version. |
10 | (at your 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, |
10 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
13 | but 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 |
12 | GNU General Public License for more details. |
15 | GNU General 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 |
15 | along with this program; if not, write to the Free Software |
18 | along with gvpe; if not, write to the Free Software |
16 | Foundation, Inc. 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
19 | Foundation, Inc. 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
17 | */ |
20 | */ |
18 | |
21 | |
19 | #include "config.h" |
22 | #include "config.h" |
20 | |
23 | |
21 | #include <list> |
24 | #include <list> |
22 | |
25 | |
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26 | #include <cstdio> |
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27 | #include <cstring> |
23 | #include <cstdlib> |
28 | #include <cstdlib> |
24 | #include <cstring> |
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25 | #include <cstdio> |
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26 | |
29 | |
27 | #include <sys/types.h> |
30 | #include <sys/types.h> |
28 | #include <sys/socket.h> |
31 | #include <sys/socket.h> |
29 | #include <sys/poll.h> |
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30 | #include <sys/wait.h> |
32 | #include <sys/wait.h> |
31 | #include <netinet/in.h> |
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32 | #include <arpa/inet.h> |
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33 | #include <errno.h> |
33 | #include <errno.h> |
34 | #include <time.h> |
34 | #include <time.h> |
35 | #include <unistd.h> |
35 | #include <unistd.h> |
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36 | #include <fcntl.h> |
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37 | #include <sys/socket.h> |
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38 | |
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39 | #include "netcompat.h" |
36 | |
40 | |
37 | #include "pidfile.h" |
41 | #include "pidfile.h" |
38 | |
42 | |
39 | #include "connection.h" |
43 | #include "connection.h" |
40 | #include "util.h" |
44 | #include "util.h" |
41 | #include "vpn.h" |
45 | #include "vpn.h" |
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46 | |
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47 | vpn network; // THE vpn (bad design...) |
42 | |
48 | |
43 | ///////////////////////////////////////////////////////////////////////////// |
49 | ///////////////////////////////////////////////////////////////////////////// |
44 | |
50 | |
45 | const char *vpn::script_if_up () |
51 | const char *vpn::script_if_up () |
46 | { |
52 | { |
… | |
… | |
50 | mtu += ETH_OVERHEAD - 6 - 6; // now we have the data portion |
56 | mtu += ETH_OVERHEAD - 6 - 6; // now we have the data portion |
51 | mtu -= mtu % EVP_CIPHER_block_size (CIPHER); // round |
57 | mtu -= mtu % EVP_CIPHER_block_size (CIPHER); // round |
52 | mtu -= ETH_OVERHEAD - 6 - 6; // and get interface mtu again |
58 | mtu -= ETH_OVERHEAD - 6 - 6; // and get interface mtu again |
53 | |
59 | |
54 | char *env; |
60 | char *env; |
55 | asprintf (&env, "CONFBASE=%s", confbase); |
61 | asprintf (&env, "CONFBASE=%s", confbase); putenv (env); |
56 | putenv (env); |
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57 | asprintf (&env, "NODENAME=%s", THISNODE->nodename); |
62 | asprintf (&env, "NODENAME=%s", THISNODE->nodename); putenv (env); |
58 | putenv (env); |
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59 | asprintf (&env, "NODEID=%d", THISNODE->id); |
63 | asprintf (&env, "NODEID=%d", THISNODE->id); putenv (env); |
60 | putenv (env); |
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61 | asprintf (&env, "IFNAME=%s", tap->interface ()); |
64 | asprintf (&env, "IFNAME=%s", tap->interface ()); putenv (env); |
62 | putenv (env); |
65 | asprintf (&env, "IFTYPE=%s", IFTYPE); putenv (env); |
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66 | asprintf (&env, "IFSUBTYPE=%s", IFSUBTYPE); putenv (env); |
63 | asprintf (&env, "MTU=%d", mtu); |
67 | asprintf (&env, "MTU=%d", mtu); putenv (env); |
64 | putenv (env); |
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65 | asprintf (&env, "MAC=%02x:%02x:%02x:%02x:%02x:%02x", |
68 | asprintf (&env, "MAC=%02x:%02x:%02x:%02x:%02x:%02x", |
66 | 0xfe, 0xfd, 0x80, 0x00, THISNODE->id >> 8, |
69 | 0xfe, 0xfd, 0x80, 0x00, THISNODE->id >> 8, |
67 | THISNODE->id & 0xff); |
70 | THISNODE->id & 0xff); |
68 | putenv (env); |
71 | putenv (env); |
69 | |
72 | |
… | |
… | |
71 | } |
74 | } |
72 | |
75 | |
73 | int |
76 | int |
74 | vpn::setup () |
77 | vpn::setup () |
75 | { |
78 | { |
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79 | ipv4_fd = -1; |
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80 | |
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81 | if (THISNODE->protocols & PROT_IPv4 && ::conf.ip_proto) |
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82 | { |
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83 | ipv4_fd = socket (PF_INET, SOCK_RAW, ::conf.ip_proto); |
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84 | |
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85 | if (ipv4_fd < 0) |
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86 | return -1; |
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87 | |
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88 | fcntl (ipv4_fd, F_SETFL, O_NONBLOCK); |
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89 | |
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90 | #if defined(SOL_IP) && defined(IP_MTU_DISCOVER) |
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91 | // this I really consider a linux bug. I am neither connected |
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92 | // nor do I fragment myself. Linux still sets DF and doesn't |
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93 | // fragment for me sometimes. |
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94 | { |
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95 | int oval = IP_PMTUDISC_DONT; |
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96 | setsockopt (ipv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval); |
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97 | } |
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98 | #endif |
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99 | |
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100 | sockinfo si (THISNODE, PROT_IPv4); |
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101 | |
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102 | if (bind (ipv4_fd, si.sav4 (), si.salenv4 ())) |
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103 | { |
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104 | slog (L_ERR, _("can't bind ipv4 socket on %s: %s"), (const char *)si, strerror (errno)); |
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105 | exit (EXIT_FAILURE); |
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106 | } |
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107 | |
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108 | ipv4_ev_watcher.start (ipv4_fd, EVENT_READ); |
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109 | } |
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110 | |
76 | udpv4_fd = -1; |
111 | udpv4_fd = -1; |
77 | |
112 | |
78 | if (THISNODE->protocols & PROT_UDPv4) |
113 | if (THISNODE->protocols & PROT_UDPv4 && THISNODE->udp_port) |
79 | { |
114 | { |
80 | udpv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP); |
115 | udpv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP); |
81 | |
116 | |
82 | if (udpv4_fd < 0) |
117 | if (udpv4_fd < 0) |
83 | return -1; |
118 | return -1; |
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119 | |
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120 | fcntl (udpv4_fd, F_SETFL, O_NONBLOCK); |
84 | |
121 | |
85 | // standard daemon practise... |
122 | // standard daemon practise... |
86 | { |
123 | { |
87 | int oval = 1; |
124 | int oval = 1; |
88 | setsockopt (udpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval); |
125 | setsockopt (udpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval); |
89 | } |
126 | } |
90 | |
127 | |
91 | sockinfo si (THISNODE, PROT_UDPv4); |
128 | #if defined(SOL_IP) && defined(IP_MTU_DISCOVER) |
92 | |
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93 | if (bind (udpv4_fd, si.sav4 (), si.salenv4 ())) |
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94 | { |
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95 | slog (L_ERR, _("can't bind udpv4 on %s: %s"), (const char *)si, strerror (errno)); |
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96 | exit (1); |
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97 | } |
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98 | |
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99 | #ifdef IP_MTU_DISCOVER |
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100 | // this I really consider a linux bug. I am neither connected |
129 | // this I really consider a linux bug. I am neither connected |
101 | // nor do I fragment myself. Linux still sets DF and doesn't |
130 | // nor do I fragment myself. Linux still sets DF and doesn't |
102 | // fragment for me sometimes. |
131 | // fragment for me sometimes. |
103 | { |
132 | { |
104 | int oval = IP_PMTUDISC_DONT; |
133 | int oval = IP_PMTUDISC_DONT; |
105 | setsockopt (udpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval); |
134 | setsockopt (udpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval); |
106 | } |
135 | } |
107 | #endif |
136 | #endif |
108 | |
137 | |
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138 | sockinfo si (THISNODE, PROT_UDPv4); |
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139 | |
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140 | if (bind (udpv4_fd, si.sav4 (), si.salenv4 ())) |
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141 | { |
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142 | slog (L_ERR, _("can't bind udpv4 on %s: %s"), (const char *)si, strerror (errno)); |
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143 | exit (EXIT_FAILURE); |
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144 | } |
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145 | |
109 | udpv4_ev_watcher.start (udpv4_fd, POLLIN); |
146 | udpv4_ev_watcher.start (udpv4_fd, EVENT_READ); |
110 | } |
147 | } |
111 | |
148 | |
112 | ipv4_fd = -1; |
149 | icmpv4_fd = -1; |
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150 | |
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151 | #if ENABLE_ICMP |
113 | if (THISNODE->protocols & PROT_IPv4) |
152 | if (THISNODE->protocols & PROT_ICMPv4) |
114 | { |
153 | { |
115 | ipv4_fd = socket (PF_INET, SOCK_RAW, ::conf.ip_proto); |
154 | icmpv4_fd = socket (PF_INET, SOCK_RAW, IPPROTO_ICMP); |
116 | |
155 | |
117 | if (ipv4_fd < 0) |
156 | if (icmpv4_fd < 0) |
118 | return -1; |
157 | return -1; |
119 | |
158 | |
120 | sockinfo si (THISNODE, PROT_IPv4); |
159 | fcntl (icmpv4_fd, F_SETFL, O_NONBLOCK); |
121 | |
160 | |
122 | if (bind (ipv4_fd, si.sav4 (), si.salenv4 ())) |
161 | #ifdef ICMP_FILTER |
123 | { |
162 | { |
124 | slog (L_ERR, _("can't bind ipv4 socket on %s: %s"), (const char *)si, strerror (errno)); |
163 | icmp_filter oval; |
125 | exit (1); |
164 | oval.data = 0xffffffff; |
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165 | if (::conf.icmp_type < 32) |
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166 | oval.data &= ~(1 << ::conf.icmp_type); |
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167 | |
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168 | setsockopt (icmpv4_fd, SOL_RAW, ICMP_FILTER, &oval, sizeof oval); |
126 | } |
169 | } |
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170 | #endif |
127 | |
171 | |
128 | #ifdef IP_MTU_DISCOVER |
172 | #if defined(SOL_IP) && defined(IP_MTU_DISCOVER) |
129 | // this I really consider a linux bug. I am neither connected |
173 | // this I really consider a linux bug. I am neither connected |
130 | // nor do I fragment myself. Linux still sets DF and doesn't |
174 | // nor do I fragment myself. Linux still sets DF and doesn't |
131 | // fragment for me sometimes. |
175 | // fragment for me sometimes. |
132 | { |
176 | { |
133 | int oval = IP_PMTUDISC_DONT; |
177 | int oval = IP_PMTUDISC_DONT; |
134 | setsockopt (ipv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval); |
178 | setsockopt (udpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval); |
135 | } |
179 | } |
136 | #endif |
180 | #endif |
137 | |
181 | |
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182 | sockinfo si (THISNODE, PROT_ICMPv4); |
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183 | |
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184 | if (bind (icmpv4_fd, si.sav4 (), si.salenv4 ())) |
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185 | { |
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186 | slog (L_ERR, _("can't bind icmpv4 on %s: %s"), (const char *)si, strerror (errno)); |
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187 | exit (EXIT_FAILURE); |
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188 | } |
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189 | |
138 | ipv4_ev_watcher.start (ipv4_fd, POLLIN); |
190 | icmpv4_ev_watcher.start (icmpv4_fd, EVENT_READ); |
139 | } |
191 | } |
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192 | #endif |
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193 | |
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194 | tcpv4_fd = -1; |
140 | |
195 | |
141 | #if ENABLE_TCP |
196 | #if ENABLE_TCP |
142 | if (THISNODE->protocols & PROT_TCPv4) |
197 | if (THISNODE->protocols & PROT_TCPv4 && THISNODE->tcp_port) |
143 | { |
198 | { |
144 | tcpv4_fd = socket (PF_INET, SOCK_STREAM, IPPROTO_TCP); |
199 | tcpv4_fd = socket (PF_INET, SOCK_STREAM, IPPROTO_TCP); |
145 | |
200 | |
146 | if (tcpv4_fd < 0) |
201 | if (tcpv4_fd < 0) |
147 | return -1; |
202 | return -1; |
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203 | |
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204 | fcntl (tcpv4_fd, F_SETFL, O_NONBLOCK); |
148 | |
205 | |
149 | // standard daemon practise... |
206 | // standard daemon practise... |
150 | { |
207 | { |
151 | int oval = 1; |
208 | int oval = 1; |
152 | setsockopt (tcpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval); |
209 | setsockopt (tcpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval); |
… | |
… | |
155 | sockinfo si (THISNODE, PROT_TCPv4); |
212 | sockinfo si (THISNODE, PROT_TCPv4); |
156 | |
213 | |
157 | if (bind (tcpv4_fd, si.sav4 (), si.salenv4 ())) |
214 | if (bind (tcpv4_fd, si.sav4 (), si.salenv4 ())) |
158 | { |
215 | { |
159 | slog (L_ERR, _("can't bind tcpv4 on %s: %s"), (const char *)si, strerror (errno)); |
216 | slog (L_ERR, _("can't bind tcpv4 on %s: %s"), (const char *)si, strerror (errno)); |
160 | exit (1); |
217 | exit (EXIT_FAILURE); |
161 | } |
218 | } |
162 | |
219 | |
163 | if (listen (tcpv4_fd, 5)) |
220 | if (listen (tcpv4_fd, 5)) |
164 | { |
221 | { |
165 | slog (L_ERR, _("can't listen tcpv4 on %s: %s"), (const char *)si, strerror (errno)); |
222 | slog (L_ERR, _("can't listen tcpv4 on %s: %s"), (const char *)si, strerror (errno)); |
166 | exit (1); |
223 | exit (EXIT_FAILURE); |
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224 | } |
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225 | |
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226 | tcpv4_ev_watcher.start (tcpv4_fd, EVENT_READ); |
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227 | } |
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228 | #endif |
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229 | |
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230 | #if ENABLE_DNS |
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231 | if (THISNODE->protocols & PROT_DNSv4) |
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232 | { |
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233 | dnsv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP); |
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234 | |
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235 | if (dnsv4_fd < 0) |
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236 | return -1; |
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237 | |
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238 | // standard daemon practise... |
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239 | { |
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240 | int oval = 1; |
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241 | setsockopt (tcpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval); |
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242 | } |
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243 | |
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244 | sockinfo si (THISNODE, PROT_DNSv4); |
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245 | |
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246 | if (bind (dnsv4_fd, si.sav4 (), si.salenv4 ())) |
167 | } |
247 | { |
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248 | slog (L_ERR, _("can't bind dnsv4 on %s: %s"), (const char *)si, strerror (errno)); |
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249 | exit (EXIT_FAILURE); |
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250 | } |
168 | |
251 | |
169 | tcpv4_ev_watcher.start (tcpv4_fd, POLLIN); |
252 | dnsv4_ev_watcher.start (dnsv4_fd, EVENT_READ); |
170 | } |
253 | } |
171 | #endif |
254 | #endif |
172 | |
255 | |
173 | tap = new tap_device (); |
256 | tap = new tap_device (); |
174 | if (!tap) //D this, of course, never catches |
257 | if (!tap) //D this, of course, never catches |
175 | { |
258 | { |
176 | slog (L_ERR, _("cannot create network interface '%s'"), conf.ifname); |
259 | slog (L_ERR, _("cannot create network interface '%s'"), conf.ifname); |
177 | exit (1); |
260 | exit (EXIT_FAILURE); |
178 | } |
261 | } |
179 | |
262 | |
180 | run_script (run_script_cb (this, &vpn::script_if_up), true); |
263 | run_script (run_script_cb (this, &vpn::script_if_up), true); |
181 | |
264 | |
182 | tap_ev_watcher.start (tap->fd, POLLIN); |
265 | tap_ev_watcher.start (tap->fd, EVENT_READ); |
183 | |
266 | |
184 | reconnect_all (); |
267 | reconnect_all (); |
185 | |
268 | |
186 | return 0; |
269 | return 0; |
187 | } |
270 | } |
188 | |
271 | |
189 | // send a vpn packet out to other hosts |
272 | bool |
190 | void |
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191 | vpn::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
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192 | { |
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193 | switch (si.prot) |
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194 | { |
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195 | case PROT_IPv4: |
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196 | send_ipv4_packet (pkt, si, tos); |
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197 | break; |
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198 | |
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199 | case PROT_UDPv4: |
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200 | send_udpv4_packet (pkt, si, tos); |
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201 | break; |
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202 | |
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203 | #if ENABLE_TCP |
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204 | case PROT_TCPv4: |
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205 | send_tcpv4_packet (pkt, si, tos); |
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206 | break; |
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207 | #endif |
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208 | |
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209 | default: |
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210 | slog (L_CRIT, _("%s: FATAL: trying to send packet with unsupported protocol"), (const char *)si); |
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211 | abort (); |
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212 | } |
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213 | } |
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214 | |
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215 | void |
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216 | vpn::send_ipv4_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
273 | vpn::send_ipv4_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
217 | { |
274 | { |
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275 | #if defined(SOL_IP) && defined(IP_TOS) |
218 | setsockopt (ipv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos); |
276 | setsockopt (ipv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos); |
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277 | #endif |
219 | sendto (ipv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ()); |
278 | sendto (ipv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ()); |
220 | } |
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221 | |
279 | |
222 | void |
280 | return true; |
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281 | } |
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282 | |
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283 | static u16 |
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284 | ipv4_checksum (u16 *data, unsigned int len) |
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285 | { |
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286 | // use 32 bit accumulator and fold back carry bits at the end |
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287 | u32 sum = 0; |
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288 | |
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289 | while (len > 1) |
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290 | { |
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291 | sum += *data++; |
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292 | len -= 2; |
|
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293 | } |
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294 | |
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295 | // odd byte left? |
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296 | if (len) |
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297 | sum += *(u8 *)data; |
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298 | |
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299 | // add back carry bits |
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300 | sum = (sum >> 16) + (sum & 0xffff); // lo += hi |
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301 | sum += (sum >> 16); // carry |
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302 | |
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303 | return ~sum; |
|
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304 | } |
|
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305 | |
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306 | #if ENABLE_ICMP |
|
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307 | bool |
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308 | vpn::send_icmpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
|
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309 | { |
|
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310 | #if defined(SOL_IP) && defined(IP_TOS) |
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311 | setsockopt (icmpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos); |
|
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312 | #endif |
|
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313 | |
|
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314 | pkt->unshift_hdr (4); |
|
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315 | |
|
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316 | icmp_header *hdr = (icmp_header *)&((*pkt)[0]); |
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317 | hdr->type = ::conf.icmp_type; |
|
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318 | hdr->code = 255; |
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319 | hdr->checksum = 0; |
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320 | hdr->checksum = ipv4_checksum ((u16 *)hdr, pkt->len); |
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321 | |
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|
322 | sendto (icmpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ()); |
|
|
323 | |
|
|
324 | return true; |
|
|
325 | } |
|
|
326 | #endif |
|
|
327 | |
|
|
328 | bool |
223 | vpn::send_udpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
329 | vpn::send_udpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
224 | { |
330 | { |
|
|
331 | #if defined(SOL_IP) && defined(IP_TOS) |
225 | setsockopt (udpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos); |
332 | setsockopt (udpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos); |
|
|
333 | #endif |
226 | sendto (udpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ()); |
334 | sendto (udpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ()); |
|
|
335 | |
|
|
336 | return true; |
|
|
337 | } |
|
|
338 | |
|
|
339 | void |
|
|
340 | vpn::inject_data_packet (tap_packet *pkt, int dst) |
|
|
341 | { |
|
|
342 | if (dst) |
|
|
343 | { |
|
|
344 | // unicast |
|
|
345 | if (dst != THISNODE->id) |
|
|
346 | conns[dst - 1]->inject_data_packet (pkt); |
|
|
347 | } |
|
|
348 | else |
|
|
349 | { |
|
|
350 | // broadcast, this is ugly, but due to the security policy |
|
|
351 | // we have to connect to all hosts... |
|
|
352 | for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c) |
|
|
353 | if ((*c)->conf != THISNODE) |
|
|
354 | (*c)->inject_data_packet (pkt, true); |
|
|
355 | } |
227 | } |
356 | } |
228 | |
357 | |
229 | void |
358 | void |
230 | vpn::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi) |
359 | vpn::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi) |
231 | { |
360 | { |
… | |
… | |
238 | if (src == 0 || src > conns.size () |
367 | if (src == 0 || src > conns.size () |
239 | || dst > conns.size () |
368 | || dst > conns.size () |
240 | || pkt->typ () >= vpn_packet::PT_MAX) |
369 | || pkt->typ () >= vpn_packet::PT_MAX) |
241 | slog (L_WARN, _("(%s): received corrupted packet type %d (src %d, dst %d)"), |
370 | slog (L_WARN, _("(%s): received corrupted packet type %d (src %d, dst %d)"), |
242 | (const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ()); |
371 | (const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ()); |
|
|
372 | else if (dst > conns.size ()) |
|
|
373 | slog (L_WARN, _("(%s): received corrupted packet type %d (src %d, dst %d)"), |
|
|
374 | (const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ()); |
243 | else |
375 | else |
244 | { |
376 | { |
245 | connection *c = conns[src - 1]; |
377 | connection *c = conns[src - 1]; |
246 | |
378 | |
247 | if (dst == 0 && !THISNODE->routerprio) |
379 | if (dst == 0) |
248 | slog (L_WARN, _("%s(%s): received broadcast, but we are no router"), |
380 | slog (L_WARN, _("%s(%s): received broadcast (protocol violation)"), |
249 | c->conf->nodename, (const char *)rsi); |
381 | c->conf->nodename, (const char *)rsi); |
250 | else if (dst != 0 && dst != THISNODE->id) |
382 | else if (dst != THISNODE->id) |
251 | // FORWARDING NEEDED ;) |
383 | { |
|
|
384 | if (THISNODE->routerprio) |
|
|
385 | // the tos setting gets lost here. who cares. |
|
|
386 | conns[dst - 1]->inject_vpn_packet (pkt); |
|
|
387 | else |
252 | slog (L_WARN, |
388 | slog (L_WARN, |
253 | _("received frame for node %d ('%s') from %s, but this is node %d ('%s')"), |
389 | _("%s(%s): forwarding request (=> %s), but we are no router"), |
|
|
390 | c->conf->nodename, (const char *)rsi, |
254 | dst, conns[dst - 1]->conf->nodename, |
391 | conns[dst - 1]->conf->nodename); |
255 | (const char *)rsi, |
392 | } |
256 | THISNODE->id, THISNODE->nodename); |
|
|
257 | else |
393 | else |
258 | c->recv_vpn_packet (pkt, rsi); |
394 | c->recv_vpn_packet (pkt, rsi); |
259 | } |
395 | } |
260 | } |
396 | } |
261 | |
397 | |
262 | void |
398 | void |
263 | vpn::udpv4_ev (io_watcher &w, short revents) |
399 | vpn::ipv4_ev (io_watcher &w, short revents) |
264 | { |
400 | { |
265 | if (revents & (POLLIN | POLLERR)) |
401 | if (revents & EVENT_READ) |
266 | { |
402 | { |
267 | vpn_packet *pkt = new vpn_packet; |
403 | vpn_packet *pkt = new vpn_packet; |
268 | struct sockaddr_in sa; |
404 | struct sockaddr_in sa; |
269 | socklen_t sa_len = sizeof (sa); |
405 | socklen_t sa_len = sizeof (sa); |
270 | int len; |
406 | int len; |
271 | |
407 | |
272 | len = recvfrom (w.fd, &((*pkt)[0]), MAXSIZE, 0, (sockaddr *)&sa, &sa_len); |
408 | len = recvfrom (w.fd, &((*pkt)[0]), MAXSIZE, 0, (sockaddr *)&sa, &sa_len); |
273 | |
409 | |
274 | sockinfo si(sa, PROT_UDPv4); |
410 | sockinfo si(sa, PROT_IPv4); |
275 | |
411 | |
276 | if (len > 0) |
412 | if (len > 0) |
277 | { |
413 | { |
278 | pkt->len = len; |
414 | pkt->len = len; |
279 | |
415 | |
|
|
416 | // raw sockets deliver the ipv4, but don't expect it on sends |
|
|
417 | // this is slow, but... |
|
|
418 | pkt->skip_hdr (IP_OVERHEAD); |
|
|
419 | |
280 | recv_vpn_packet (pkt, si); |
420 | recv_vpn_packet (pkt, si); |
281 | } |
421 | } |
282 | else |
422 | else |
283 | { |
423 | { |
284 | // probably ECONNRESET or somesuch |
424 | // probably ECONNRESET or somesuch |
285 | slog (L_DEBUG, _("%s: fd %d, %s"), (const char *)si, w.fd, strerror (errno)); |
425 | slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno)); |
286 | } |
426 | } |
287 | |
427 | |
288 | delete pkt; |
428 | delete pkt; |
289 | } |
|
|
290 | else if (revents & POLLHUP) |
|
|
291 | { |
|
|
292 | // this cannot ;) happen on udp sockets |
|
|
293 | slog (L_ERR, _("FATAL: POLLHUP on udp v4 fd, terminating.")); |
|
|
294 | exit (1); |
|
|
295 | } |
429 | } |
296 | else |
430 | else |
297 | { |
431 | { |
298 | slog (L_ERR, |
432 | slog (L_ERR, |
299 | _("FATAL: unknown revents %08x in socket, terminating\n"), |
433 | _("FATAL: unknown revents %08x in socket, terminating\n"), |
300 | revents); |
434 | revents); |
301 | exit (1); |
435 | exit (EXIT_FAILURE); |
302 | } |
436 | } |
303 | } |
437 | } |
304 | |
438 | |
|
|
439 | #if ENABLE_ICMP |
305 | void |
440 | void |
306 | vpn::ipv4_ev (io_watcher &w, short revents) |
441 | vpn::icmpv4_ev (io_watcher &w, short revents) |
307 | { |
442 | { |
308 | if (revents & (POLLIN | POLLERR)) |
443 | if (revents & EVENT_READ) |
309 | { |
444 | { |
310 | vpn_packet *pkt = new vpn_packet; |
445 | vpn_packet *pkt = new vpn_packet; |
311 | struct sockaddr_in sa; |
446 | struct sockaddr_in sa; |
312 | socklen_t sa_len = sizeof (sa); |
447 | socklen_t sa_len = sizeof (sa); |
313 | int len; |
448 | int len; |
314 | |
449 | |
315 | len = recvfrom (w.fd, &((*pkt)[0]), MAXSIZE, 0, (sockaddr *)&sa, &sa_len); |
450 | len = recvfrom (w.fd, &((*pkt)[0]), MAXSIZE, 0, (sockaddr *)&sa, &sa_len); |
316 | |
451 | |
317 | sockinfo si(sa, PROT_IPv4); |
452 | sockinfo si(sa, PROT_ICMPv4); |
318 | |
453 | |
319 | if (len > 0) |
454 | if (len > 0) |
320 | { |
455 | { |
321 | pkt->len = len; |
456 | pkt->len = len; |
322 | |
457 | |
|
|
458 | icmp_header *hdr = (icmp_header *)&((*pkt)[IP_OVERHEAD]); |
|
|
459 | |
|
|
460 | if (hdr->type == ::conf.icmp_type |
|
|
461 | && hdr->code == 255) |
|
|
462 | { |
323 | // raw sockets deliver the ipv4, but don't expect it on sends |
463 | // raw sockets deliver the ipv4, but don't expect it on sends |
324 | // this is slow, but... |
464 | // this is slow, but... |
325 | pkt->skip_hdr (IP_OVERHEAD); |
465 | pkt->skip_hdr (ICMP_OVERHEAD); |
326 | |
466 | |
327 | recv_vpn_packet (pkt, si); |
467 | recv_vpn_packet (pkt, si); |
|
|
468 | } |
328 | } |
469 | } |
329 | else |
470 | else |
330 | { |
471 | { |
331 | // probably ECONNRESET or somesuch |
472 | // probably ECONNRESET or somesuch |
332 | slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno)); |
473 | slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno)); |
333 | } |
474 | } |
334 | |
475 | |
335 | delete pkt; |
476 | delete pkt; |
336 | } |
|
|
337 | else if (revents & POLLHUP) |
|
|
338 | { |
|
|
339 | // this cannot ;) happen on udp sockets |
|
|
340 | slog (L_ERR, _("FATAL: POLLHUP on ipv4 fd, terminating.")); |
|
|
341 | exit (1); |
|
|
342 | } |
477 | } |
343 | else |
478 | else |
344 | { |
479 | { |
345 | slog (L_ERR, |
480 | slog (L_ERR, |
346 | _("FATAL: unknown revents %08x in socket, terminating\n"), |
481 | _("FATAL: unknown revents %08x in socket, terminating\n"), |
347 | revents); |
482 | revents); |
348 | exit (1); |
483 | exit (EXIT_FAILURE); |
|
|
484 | } |
|
|
485 | } |
|
|
486 | #endif |
|
|
487 | |
|
|
488 | void |
|
|
489 | vpn::udpv4_ev (io_watcher &w, short revents) |
|
|
490 | { |
|
|
491 | if (revents & EVENT_READ) |
|
|
492 | { |
|
|
493 | vpn_packet *pkt = new vpn_packet; |
|
|
494 | struct sockaddr_in sa; |
|
|
495 | socklen_t sa_len = sizeof (sa); |
|
|
496 | int len; |
|
|
497 | |
|
|
498 | len = recvfrom (w.fd, &((*pkt)[0]), MAXSIZE, 0, (sockaddr *)&sa, &sa_len); |
|
|
499 | |
|
|
500 | sockinfo si(sa, PROT_UDPv4); |
|
|
501 | |
|
|
502 | if (len > 0) |
|
|
503 | { |
|
|
504 | pkt->len = len; |
|
|
505 | |
|
|
506 | recv_vpn_packet (pkt, si); |
|
|
507 | } |
|
|
508 | else |
|
|
509 | { |
|
|
510 | // probably ECONNRESET or somesuch |
|
|
511 | slog (L_DEBUG, _("%s: fd %d, %s"), (const char *)si, w.fd, strerror (errno)); |
|
|
512 | } |
|
|
513 | |
|
|
514 | delete pkt; |
|
|
515 | } |
|
|
516 | else |
|
|
517 | { |
|
|
518 | slog (L_ERR, |
|
|
519 | _("FATAL: unknown revents %08x in socket, terminating\n"), |
|
|
520 | revents); |
|
|
521 | exit (EXIT_FAILURE); |
349 | } |
522 | } |
350 | } |
523 | } |
351 | |
524 | |
352 | void |
525 | void |
353 | vpn::tap_ev (io_watcher &w, short revents) |
526 | vpn::tap_ev (io_watcher &w, short revents) |
354 | { |
527 | { |
355 | if (revents & POLLIN) |
528 | if (revents & EVENT_READ) |
356 | { |
529 | { |
357 | /* process data */ |
530 | /* process data */ |
358 | tap_packet *pkt; |
531 | tap_packet *pkt; |
359 | |
532 | |
360 | pkt = tap->recv (); |
533 | pkt = tap->recv (); |
361 | |
534 | |
|
|
535 | if (!pkt) |
|
|
536 | return; |
|
|
537 | |
|
|
538 | if (pkt->len > 14) |
|
|
539 | { |
362 | int dst = mac2id (pkt->dst); |
540 | int dst = mac2id (pkt->dst); |
363 | int src = mac2id (pkt->src); |
541 | int src = mac2id (pkt->src); |
364 | |
542 | |
365 | if (src != THISNODE->id) |
543 | if (src != THISNODE->id) |
366 | { |
|
|
367 | slog (L_ERR, _("FATAL: tap packet not originating on current node received, terminating.")); |
|
|
368 | exit (1); |
|
|
369 | } |
|
|
370 | |
|
|
371 | if (dst == THISNODE->id) |
|
|
372 | { |
|
|
373 | slog (L_ERR, _("FATAL: tap packet destined for current node received, terminating.")); |
|
|
374 | exit (1); |
|
|
375 | } |
|
|
376 | |
|
|
377 | if (dst > conns.size ()) |
|
|
378 | slog (L_ERR, _("tap packet for unknown node %d received, ignoring."), dst); |
|
|
379 | else |
|
|
380 | { |
|
|
381 | if (dst) |
|
|
382 | { |
544 | { |
383 | // unicast |
545 | slog (L_ERR, _("FATAL: tap packet not originating on current node received, exiting.")); |
384 | if (dst != THISNODE->id) |
546 | exit (EXIT_FAILURE); |
385 | conns[dst - 1]->inject_data_packet (pkt); |
|
|
386 | } |
547 | } |
|
|
548 | |
|
|
549 | if (dst == THISNODE->id) |
|
|
550 | { |
|
|
551 | slog (L_ERR, _("FATAL: tap packet destined for current node received, exiting.")); |
|
|
552 | exit (EXIT_FAILURE); |
|
|
553 | } |
|
|
554 | |
|
|
555 | if (dst > conns.size ()) |
|
|
556 | slog (L_ERR, _("tap packet for unknown node %d received, ignoring."), dst); |
387 | else |
557 | else |
388 | { |
|
|
389 | // broadcast, first check router, then self, then english |
|
|
390 | connection *router = find_router (); |
|
|
391 | |
|
|
392 | if (router) |
|
|
393 | router->inject_data_packet (pkt, true); |
558 | inject_data_packet (pkt, dst); |
394 | else |
|
|
395 | for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c) |
|
|
396 | if ((*c)->conf != THISNODE) |
|
|
397 | (*c)->inject_data_packet (pkt); |
|
|
398 | } |
|
|
399 | } |
559 | } |
400 | |
560 | |
401 | delete pkt; |
561 | delete pkt; |
402 | } |
|
|
403 | else if (revents & (POLLHUP | POLLERR)) |
|
|
404 | { |
|
|
405 | slog (L_ERR, _("FATAL: POLLHUP or POLLERR on network device fd, terminating.")); |
|
|
406 | exit (1); |
|
|
407 | } |
562 | } |
408 | else |
563 | else |
409 | abort (); |
564 | abort (); |
410 | } |
565 | } |
411 | |
566 | |
… | |
… | |
417 | if (events & EVENT_SHUTDOWN) |
572 | if (events & EVENT_SHUTDOWN) |
418 | { |
573 | { |
419 | slog (L_INFO, _("preparing shutdown...")); |
574 | slog (L_INFO, _("preparing shutdown...")); |
420 | |
575 | |
421 | shutdown_all (); |
576 | shutdown_all (); |
422 | |
|
|
423 | remove_pid (pidfilename); |
577 | remove_pid (conf.pidfilename); |
424 | |
|
|
425 | slog (L_INFO, _("terminating")); |
578 | slog (L_INFO, _("terminating")); |
426 | |
579 | exit (EXIT_SUCCESS); |
427 | exit (0); |
|
|
428 | } |
580 | } |
429 | |
581 | |
430 | if (events & EVENT_RECONNECT) |
582 | if (events & EVENT_RECONNECT) |
431 | { |
583 | { |
432 | slog (L_INFO, _("forced reconnect")); |
584 | slog (L_INFO, _("forced reconnect")); |
… | |
… | |
434 | reconnect_all (); |
586 | reconnect_all (); |
435 | } |
587 | } |
436 | |
588 | |
437 | events = 0; |
589 | events = 0; |
438 | } |
590 | } |
439 | |
|
|
440 | w.at = TSTAMP_CANCEL; |
|
|
441 | } |
591 | } |
442 | |
592 | |
443 | void |
593 | void |
444 | vpn::shutdown_all () |
594 | vpn::shutdown_all () |
445 | { |
595 | { |
… | |
… | |
458 | connection_init (); |
608 | connection_init (); |
459 | |
609 | |
460 | for (configuration::node_vector::iterator i = conf.nodes.begin (); |
610 | for (configuration::node_vector::iterator i = conf.nodes.begin (); |
461 | i != conf.nodes.end (); ++i) |
611 | i != conf.nodes.end (); ++i) |
462 | { |
612 | { |
463 | connection *conn = new connection (this); |
613 | connection *conn = new connection (this, *i); |
464 | |
|
|
465 | conn->conf = *i; |
|
|
466 | conns.push_back (conn); |
614 | conns.push_back (conn); |
467 | |
|
|
468 | conn->establish_connection (); |
615 | conn->establish_connection (); |
469 | } |
616 | } |
470 | } |
617 | } |
471 | |
618 | |
472 | connection *vpn::find_router () |
619 | connection *vpn::find_router () |
473 | { |
620 | { |
474 | u32 prio = 0; |
621 | u32 prio = 1; |
475 | connection *router = 0; |
622 | connection *router = 0; |
476 | |
623 | |
477 | for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i) |
624 | for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i) |
478 | { |
625 | { |
479 | connection *c = *i; |
626 | connection *c = *i; |
480 | |
627 | |
481 | if (c->conf->routerprio > prio |
628 | if (c->conf->routerprio > prio |
482 | && c->connectmode == conf_node::C_ALWAYS |
629 | && c->connectmode == conf_node::C_ALWAYS // so we don't drop the connection if in use |
483 | && c->conf != THISNODE |
|
|
484 | && c->ictx && c->octx) |
630 | && c->ictx && c->octx |
|
|
631 | && c->conf != THISNODE) // redundant, since ictx==octx==0 always on thisnode |
485 | { |
632 | { |
486 | prio = c->conf->routerprio; |
633 | prio = c->conf->routerprio; |
487 | router = c; |
634 | router = c; |
488 | } |
635 | } |
489 | } |
636 | } |
490 | |
637 | |
491 | return router; |
638 | return router; |
492 | } |
639 | } |
493 | |
640 | |
494 | void vpn::connect_request (int id) |
641 | void vpn::send_connect_request (int id) |
495 | { |
642 | { |
496 | connection *c = find_router (); |
643 | connection *c = find_router (); |
497 | |
644 | |
498 | if (c) |
645 | if (c) |
499 | c->connect_request (id); |
646 | c->send_connect_request (id); |
500 | //else // does not work, because all others must connect to the same router |
647 | else |
501 | // // no router found, aggressively connect to all routers |
648 | // no router found, aggressively connect to all routers |
502 | // for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i) |
649 | for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i) |
503 | // if ((*i)->conf->routerprio) |
650 | if ((*i)->conf->routerprio && (*i)->conf != THISNODE) |
504 | // (*i)->establish_connection (); |
651 | (*i)->establish_connection (); |
505 | } |
652 | } |
506 | |
653 | |
507 | void |
654 | void |
508 | connection::dump_status () |
655 | connection::dump_status () |
509 | { |
656 | { |
… | |
… | |
526 | |
673 | |
527 | slog (L_NOTICE, _("END status dump")); |
674 | slog (L_NOTICE, _("END status dump")); |
528 | } |
675 | } |
529 | |
676 | |
530 | vpn::vpn (void) |
677 | vpn::vpn (void) |
531 | : event(this, &vpn::event_cb) |
678 | : event (this, &vpn::event_cb) |
532 | , udpv4_ev_watcher(this, &vpn::udpv4_ev) |
679 | , udpv4_ev_watcher (this, &vpn::udpv4_ev) |
533 | , ipv4_ev_watcher (this, &vpn::ipv4_ev) |
680 | , ipv4_ev_watcher (this, &vpn::ipv4_ev) |
534 | , tap_ev_watcher (this, &vpn::tap_ev) |
|
|
535 | #if ENABLE_TCP |
681 | #if ENABLE_TCP |
536 | , tcpv4_ev_watcher(this, &vpn::tcpv4_ev) |
682 | , tcpv4_ev_watcher (this, &vpn::tcpv4_ev) |
537 | #endif |
683 | #endif |
|
|
684 | #if ENABLE_ICMP |
|
|
685 | , icmpv4_ev_watcher(this, &vpn::icmpv4_ev) |
|
|
686 | #endif |
|
|
687 | #if ENABLE_DNS |
|
|
688 | , dnsv4_ev_watcher (this, &vpn::dnsv4_ev) |
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689 | #endif |
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690 | , tap_ev_watcher (this, &vpn::tap_ev) |
538 | { |
691 | { |
539 | } |
692 | } |
540 | |
693 | |
541 | vpn::~vpn () |
694 | vpn::~vpn () |
542 | { |
695 | { |