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" |
42 | |
46 | |
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47 | vpn network; // THE vpn (bad design...) |
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48 | |
43 | ///////////////////////////////////////////////////////////////////////////// |
49 | ///////////////////////////////////////////////////////////////////////////// |
44 | |
50 | |
45 | const char *vpn::script_if_up (int) |
51 | void |
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52 | vpn::script_init_env () |
46 | { |
53 | { |
47 | // the tunnel device mtu should be the physical mtu - overhead |
54 | // the tunnel device mtu should be the physical mtu - overhead |
48 | // the tricky part is rounding to the cipher key blocksize |
55 | // the tricky part is rounding to the cipher key blocksize |
49 | int mtu = conf.mtu - ETH_OVERHEAD - VPE_OVERHEAD - MAX_OVERHEAD; |
56 | int mtu = conf.mtu - ETH_OVERHEAD - VPE_OVERHEAD - MAX_OVERHEAD; |
50 | mtu += ETH_OVERHEAD - 6 - 6; // now we have the data portion |
57 | mtu += ETH_OVERHEAD - 6 - 6; // now we have the data portion |
51 | mtu -= mtu % EVP_CIPHER_block_size (CIPHER); // round |
58 | mtu -= mtu % EVP_CIPHER_block_size (CIPHER); // round |
52 | mtu -= ETH_OVERHEAD - 6 - 6; // and get interface mtu again |
59 | mtu -= ETH_OVERHEAD - 6 - 6; // and get interface mtu again |
53 | |
60 | |
54 | char *env; |
61 | char *env; |
55 | asprintf (&env, "CONFBASE=%s", confbase); |
62 | asprintf (&env, "CONFBASE=%s", confbase); putenv (env); |
56 | putenv (env); |
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57 | asprintf (&env, "NODENAME=%s", THISNODE->nodename); |
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58 | putenv (env); |
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59 | asprintf (&env, "NODEID=%d", THISNODE->id); |
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60 | putenv (env); |
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61 | asprintf (&env, "IFNAME=%s", tap->interface ()); |
63 | asprintf (&env, "IFNAME=%s", tap->interface ()); putenv (env); |
62 | putenv (env); |
64 | asprintf (&env, "IFTYPE=%s", IFTYPE); putenv (env); |
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65 | asprintf (&env, "IFSUBTYPE=%s", IFSUBTYPE); putenv (env); |
63 | asprintf (&env, "MTU=%d", mtu); |
66 | asprintf (&env, "MTU=%d", mtu); putenv (env); |
64 | putenv (env); |
67 | asprintf (&env, "NODES=%d", conns.size ()); putenv (env); |
65 | asprintf (&env, "MAC=%02x:%02x:%02x:%02x:%02x:%02x", |
68 | asprintf (&env, "NODEID=%d", THISNODE->id); putenv (env); |
66 | 0xfe, 0xfd, 0x80, 0x00, THISNODE->id >> 8, |
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67 | THISNODE->id & 0xff); |
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68 | putenv (env); |
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69 | |
69 | |
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70 | conns [THISNODE->id - 1]->script_init_env (""); |
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71 | |
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72 | for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c) |
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73 | { |
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74 | char ext[16]; |
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75 | snprintf (ext, 16, "_%d", (*c)->conf->id); |
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76 | (*c)->script_init_env (ext); |
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77 | } |
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78 | } |
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79 | |
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80 | const char *vpn::script_if_init () |
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81 | { |
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82 | script_init_env (); |
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83 | |
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84 | return tap->if_up (); |
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85 | } |
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86 | |
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87 | const char *vpn::script_if_up () |
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88 | { |
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89 | script_init_env (); |
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90 | |
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91 | char *filename; |
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92 | asprintf (&filename, |
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93 | "%s/%s", |
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94 | confbase, |
70 | return ::conf.script_if_up ? ::conf.script_if_up : "if-up"; |
95 | ::conf.script_if_up ? ::conf.script_if_up : "if-up"); |
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96 | |
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97 | return filename; |
71 | } |
98 | } |
72 | |
99 | |
73 | int |
100 | int |
74 | vpn::setup () |
101 | vpn::setup () |
75 | { |
102 | { |
76 | sockinfo si; |
103 | ipv4_fd = -1; |
77 | |
104 | |
78 | si.set (THISNODE); |
105 | if (THISNODE->protocols & PROT_IPv4 && ::conf.ip_proto) |
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106 | { |
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107 | ipv4_fd = socket (PF_INET, SOCK_RAW, ::conf.ip_proto); |
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108 | |
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109 | if (ipv4_fd < 0) |
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110 | return -1; |
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111 | |
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112 | fcntl (ipv4_fd, F_SETFL, O_NONBLOCK); |
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113 | |
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114 | #if defined(SOL_IP) && defined(IP_MTU_DISCOVER) |
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115 | // this I really consider a linux bug. I am neither connected |
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116 | // nor do I fragment myself. Linux still sets DF and doesn't |
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117 | // fragment for me sometimes. |
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118 | { |
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119 | int oval = IP_PMTUDISC_DONT; |
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120 | setsockopt (ipv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval); |
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121 | } |
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122 | #endif |
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123 | |
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124 | sockinfo si (THISNODE, PROT_IPv4); |
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125 | |
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126 | if (bind (ipv4_fd, si.sav4 (), si.salenv4 ())) |
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127 | { |
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128 | slog (L_ERR, _("can't bind ipv4 socket on %s: %s"), (const char *)si, strerror (errno)); |
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129 | exit (EXIT_FAILURE); |
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130 | } |
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131 | |
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132 | ipv4_ev_watcher.start (ipv4_fd, EVENT_READ); |
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133 | } |
79 | |
134 | |
80 | udpv4_fd = -1; |
135 | udpv4_fd = -1; |
81 | |
136 | |
82 | if (THISNODE->protocols & PROT_UDPv4) |
137 | if (THISNODE->protocols & PROT_UDPv4 && THISNODE->udp_port) |
83 | { |
138 | { |
84 | udpv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP); |
139 | udpv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP); |
85 | |
140 | |
86 | if (udpv4_fd < 0) |
141 | if (udpv4_fd < 0) |
87 | return -1; |
142 | return -1; |
88 | |
143 | |
89 | if (bind (udpv4_fd, si.sav4 (), si.salenv4 ())) |
144 | fcntl (udpv4_fd, F_SETFL, O_NONBLOCK); |
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145 | |
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146 | // standard daemon practise... |
90 | { |
147 | { |
91 | slog (L_ERR, _("can't bind udpv4 to %s: %s"), (const char *)si, strerror (errno)); |
148 | int oval = 1; |
92 | exit (1); |
149 | setsockopt (udpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval); |
93 | } |
150 | } |
94 | |
151 | |
95 | #ifdef IP_MTU_DISCOVER |
152 | #if defined(SOL_IP) && defined(IP_MTU_DISCOVER) |
96 | // this I really consider a linux bug. I am neither connected |
153 | // this I really consider a linux bug. I am neither connected |
97 | // nor do I fragment myself. Linux still sets DF and doesn't |
154 | // nor do I fragment myself. Linux still sets DF and doesn't |
98 | // fragment for me sometimes. |
155 | // fragment for me sometimes. |
99 | { |
156 | { |
100 | int oval = IP_PMTUDISC_DONT; |
157 | int oval = IP_PMTUDISC_DONT; |
101 | setsockopt (udpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval); |
158 | setsockopt (udpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval); |
102 | } |
159 | } |
103 | #endif |
160 | #endif |
104 | |
161 | |
105 | // standard daemon practise... |
162 | sockinfo si (THISNODE, PROT_UDPv4); |
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163 | |
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164 | if (bind (udpv4_fd, si.sav4 (), si.salenv4 ())) |
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165 | { |
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166 | slog (L_ERR, _("can't bind udpv4 on %s: %s"), (const char *)si, strerror (errno)); |
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167 | exit (EXIT_FAILURE); |
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168 | } |
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169 | |
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170 | udpv4_ev_watcher.start (udpv4_fd, EVENT_READ); |
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171 | } |
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172 | |
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173 | icmpv4_fd = -1; |
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174 | |
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175 | #if ENABLE_ICMP |
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176 | if (THISNODE->protocols & PROT_ICMPv4) |
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177 | { |
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178 | icmpv4_fd = socket (PF_INET, SOCK_RAW, IPPROTO_ICMP); |
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179 | |
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180 | if (icmpv4_fd < 0) |
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181 | return -1; |
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182 | |
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183 | fcntl (icmpv4_fd, F_SETFL, O_NONBLOCK); |
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184 | |
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185 | #ifdef ICMP_FILTER |
106 | { |
186 | { |
107 | int oval = 1; |
187 | icmp_filter oval; |
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188 | oval.data = 0xffffffff; |
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189 | if (::conf.icmp_type < 32) |
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190 | oval.data &= ~(1 << ::conf.icmp_type); |
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191 | |
108 | setsockopt (udpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval); |
192 | setsockopt (icmpv4_fd, SOL_RAW, ICMP_FILTER, &oval, sizeof oval); |
109 | } |
193 | } |
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194 | #endif |
110 | |
195 | |
111 | udpv4_ev_watcher.start (udpv4_fd, POLLIN); |
196 | #if defined(SOL_IP) && defined(IP_MTU_DISCOVER) |
112 | } |
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113 | |
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114 | ipv4_fd = -1; |
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115 | if (THISNODE->protocols & PROT_IPv4) |
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116 | { |
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117 | ipv4_fd = socket (PF_INET, SOCK_RAW, ::conf.ip_proto); |
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118 | |
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119 | if (ipv4_fd < 0) |
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120 | return -1; |
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121 | |
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122 | if (bind (ipv4_fd, si.sav4 (), si.salenv4 ())) |
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123 | { |
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124 | slog (L_ERR, _("can't bind ipv4 socket to %s: %s"), (const char *)si, strerror (errno)); |
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125 | exit (1); |
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126 | } |
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127 | |
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128 | #ifdef IP_MTU_DISCOVER |
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129 | // this I really consider a linux bug. I am neither connected |
197 | // this I really consider a linux bug. I am neither connected |
130 | // nor do I fragment myself. Linux still sets DF and doesn't |
198 | // nor do I fragment myself. Linux still sets DF and doesn't |
131 | // fragment for me sometimes. |
199 | // fragment for me sometimes. |
132 | { |
200 | { |
133 | int oval = IP_PMTUDISC_DONT; |
201 | int oval = IP_PMTUDISC_DONT; |
134 | setsockopt (ipv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval); |
202 | setsockopt (udpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval); |
135 | } |
203 | } |
136 | #endif |
204 | #endif |
137 | |
205 | |
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206 | sockinfo si (THISNODE, PROT_ICMPv4); |
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207 | |
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208 | if (bind (icmpv4_fd, si.sav4 (), si.salenv4 ())) |
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209 | { |
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210 | slog (L_ERR, _("can't bind icmpv4 on %s: %s"), (const char *)si, strerror (errno)); |
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211 | exit (EXIT_FAILURE); |
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212 | } |
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213 | |
138 | ipv4_ev_watcher.start (ipv4_fd, POLLIN); |
214 | icmpv4_ev_watcher.start (icmpv4_fd, EVENT_READ); |
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215 | } |
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216 | #endif |
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217 | |
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218 | tcpv4_fd = -1; |
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219 | |
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220 | #if ENABLE_TCP |
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221 | if (THISNODE->protocols & PROT_TCPv4 && THISNODE->tcp_port) |
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222 | { |
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223 | tcpv4_fd = socket (PF_INET, SOCK_STREAM, IPPROTO_TCP); |
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224 | |
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225 | if (tcpv4_fd < 0) |
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226 | return -1; |
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227 | |
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228 | fcntl (tcpv4_fd, F_SETFL, O_NONBLOCK); |
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229 | |
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230 | // standard daemon practise... |
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231 | { |
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232 | int oval = 1; |
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233 | setsockopt (tcpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval); |
139 | } |
234 | } |
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235 | |
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236 | sockinfo si (THISNODE, PROT_TCPv4); |
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237 | |
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238 | if (bind (tcpv4_fd, si.sav4 (), si.salenv4 ())) |
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239 | { |
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240 | slog (L_ERR, _("can't bind tcpv4 on %s: %s"), (const char *)si, strerror (errno)); |
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241 | exit (EXIT_FAILURE); |
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242 | } |
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243 | |
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244 | if (listen (tcpv4_fd, 5)) |
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245 | { |
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246 | slog (L_ERR, _("can't listen tcpv4 on %s: %s"), (const char *)si, strerror (errno)); |
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247 | exit (EXIT_FAILURE); |
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248 | } |
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249 | |
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250 | tcpv4_ev_watcher.start (tcpv4_fd, EVENT_READ); |
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251 | } |
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252 | #endif |
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253 | |
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254 | #if ENABLE_DNS |
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255 | if (THISNODE->protocols & PROT_DNSv4) |
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256 | { |
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257 | dns_forwarder.set (::conf.dns_forw_host, ::conf.dns_forw_port, PROT_DNSv4); |
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258 | |
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259 | dnsv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP); |
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260 | |
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261 | if (dnsv4_fd < 0) |
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262 | return -1; |
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263 | |
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264 | # if defined(SOL_IP) && defined(IP_MTU_DISCOVER) |
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265 | // this I really consider a linux bug. I am neither connected |
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266 | // nor do I fragment myself. Linux still sets DF and doesn't |
|
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267 | // fragment for me sometimes. |
|
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268 | { |
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269 | int oval = IP_PMTUDISC_DONT; |
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270 | setsockopt (dnsv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval); |
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271 | } |
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272 | # endif |
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273 | |
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274 | // standard daemon practise... |
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275 | { |
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276 | int oval = 1; |
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277 | setsockopt (dnsv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval); |
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278 | } |
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279 | |
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280 | sockinfo si (THISNODE->dns_hostname, |
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281 | THISNODE->dns_hostname ? THISNODE->dns_port : 0, |
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282 | PROT_DNSv4); |
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283 | |
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284 | if (bind (dnsv4_fd, si.sav4 (), si.salenv4 ())) |
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285 | { |
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286 | slog (L_ERR, _("can't bind dnsv4 on %s: %s"), (const char *)si, strerror (errno)); |
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287 | exit (EXIT_FAILURE); |
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288 | } |
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289 | |
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290 | dnsv4_ev_watcher.start (dnsv4_fd, EVENT_READ); |
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291 | } |
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292 | #endif |
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293 | |
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294 | ///////////////////////////////////////////////////////////////////////////// |
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295 | |
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296 | reconnect_all (); |
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297 | |
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298 | ///////////////////////////////////////////////////////////////////////////// |
140 | |
299 | |
141 | tap = new tap_device (); |
300 | tap = new tap_device (); |
142 | if (!tap) //D this, of course, never catches |
301 | if (!tap) //D this, of course, never catches |
143 | { |
302 | { |
144 | slog (L_ERR, _("cannot create network interface '%s'"), conf.ifname); |
303 | slog (L_ERR, _("cannot create network interface '%s'"), conf.ifname); |
145 | exit (1); |
304 | exit (EXIT_FAILURE); |
146 | } |
305 | } |
147 | |
306 | |
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307 | if (tap->if_up () && |
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308 | !run_script (run_script_cb (this, &vpn::script_if_init), true)) |
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309 | { |
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310 | slog (L_ERR, _("interface initialization command '%s' failed, exiting."), |
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311 | tap->if_up ()); |
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312 | exit (EXIT_FAILURE); |
|
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313 | } |
|
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314 | |
148 | run_script (run_script_cb (this, &vpn::script_if_up), true); |
315 | if (!run_script (run_script_cb (this, &vpn::script_if_up), true)) |
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316 | { |
|
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317 | slog (L_ERR, _("if-up command execution failed, exiting.")); |
|
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318 | exit (EXIT_FAILURE); |
|
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319 | } |
149 | |
320 | |
150 | tap_ev_watcher.start (tap->fd, POLLIN); |
321 | tap_ev_watcher.start (tap->fd, EVENT_READ); |
151 | |
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152 | reconnect_all (); |
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153 | |
322 | |
154 | return 0; |
323 | return 0; |
155 | } |
324 | } |
156 | |
325 | |
157 | void |
326 | bool |
158 | vpn::send_ipv4_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
327 | vpn::send_ipv4_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
159 | { |
328 | { |
|
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329 | #if defined(SOL_IP) && defined(IP_TOS) |
160 | setsockopt (ipv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos); |
330 | setsockopt (ipv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos); |
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331 | #endif |
161 | sendto (ipv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ()); |
332 | sendto (ipv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ()); |
162 | } |
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163 | |
333 | |
164 | void |
334 | return true; |
|
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335 | } |
|
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336 | |
|
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337 | static u16 |
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338 | ipv4_checksum (u16 *data, unsigned int len) |
|
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339 | { |
|
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340 | // use 32 bit accumulator and fold back carry bits at the end |
|
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341 | u32 sum = 0; |
|
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342 | |
|
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343 | while (len > 1) |
|
|
344 | { |
|
|
345 | sum += *data++; |
|
|
346 | len -= 2; |
|
|
347 | } |
|
|
348 | |
|
|
349 | // odd byte left? |
|
|
350 | if (len) |
|
|
351 | sum += *(u8 *)data; |
|
|
352 | |
|
|
353 | // add back carry bits |
|
|
354 | sum = (sum >> 16) + (sum & 0xffff); // lo += hi |
|
|
355 | sum += (sum >> 16); // carry |
|
|
356 | |
|
|
357 | return ~sum; |
|
|
358 | } |
|
|
359 | |
|
|
360 | #if ENABLE_ICMP |
|
|
361 | bool |
|
|
362 | vpn::send_icmpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
|
|
363 | { |
|
|
364 | #if defined(SOL_IP) && defined(IP_TOS) |
|
|
365 | setsockopt (icmpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos); |
|
|
366 | #endif |
|
|
367 | |
|
|
368 | pkt->unshift_hdr (4); |
|
|
369 | |
|
|
370 | icmp_header *hdr = (icmp_header *)&((*pkt)[0]); |
|
|
371 | hdr->type = ::conf.icmp_type; |
|
|
372 | hdr->code = 255; |
|
|
373 | hdr->checksum = 0; |
|
|
374 | hdr->checksum = ipv4_checksum ((u16 *)hdr, pkt->len); |
|
|
375 | |
|
|
376 | sendto (icmpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ()); |
|
|
377 | |
|
|
378 | return true; |
|
|
379 | } |
|
|
380 | #endif |
|
|
381 | |
|
|
382 | bool |
165 | vpn::send_udpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
383 | vpn::send_udpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
166 | { |
384 | { |
|
|
385 | #if defined(SOL_IP) && defined(IP_TOS) |
167 | setsockopt (udpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos); |
386 | setsockopt (udpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos); |
|
|
387 | #endif |
168 | sendto (udpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ()); |
388 | sendto (udpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ()); |
|
|
389 | |
|
|
390 | return true; |
|
|
391 | } |
|
|
392 | |
|
|
393 | void |
|
|
394 | vpn::inject_data_packet (tap_packet *pkt, int dst) |
|
|
395 | { |
|
|
396 | if (dst) |
|
|
397 | { |
|
|
398 | // unicast |
|
|
399 | if (dst != THISNODE->id) |
|
|
400 | conns[dst - 1]->inject_data_packet (pkt); |
|
|
401 | } |
|
|
402 | else |
|
|
403 | { |
|
|
404 | // broadcast, this is ugly, but due to the security policy |
|
|
405 | // we have to connect to all hosts... |
|
|
406 | for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c) |
|
|
407 | if ((*c)->conf != THISNODE) |
|
|
408 | (*c)->inject_data_packet (pkt, true); |
|
|
409 | } |
169 | } |
410 | } |
170 | |
411 | |
171 | void |
412 | void |
172 | vpn::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi) |
413 | vpn::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi) |
173 | { |
414 | { |
… | |
… | |
180 | if (src == 0 || src > conns.size () |
421 | if (src == 0 || src > conns.size () |
181 | || dst > conns.size () |
422 | || dst > conns.size () |
182 | || pkt->typ () >= vpn_packet::PT_MAX) |
423 | || pkt->typ () >= vpn_packet::PT_MAX) |
183 | slog (L_WARN, _("(%s): received corrupted packet type %d (src %d, dst %d)"), |
424 | slog (L_WARN, _("(%s): received corrupted packet type %d (src %d, dst %d)"), |
184 | (const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ()); |
425 | (const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ()); |
|
|
426 | else if (dst > conns.size ()) |
|
|
427 | slog (L_WARN, _("(%s): received corrupted packet type %d (src %d, dst %d)"), |
|
|
428 | (const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ()); |
185 | else |
429 | else |
186 | { |
430 | { |
187 | connection *c = conns[src - 1]; |
431 | connection *c = conns[src - 1]; |
188 | |
432 | |
189 | if (dst == 0 && !THISNODE->routerprio) |
433 | if (dst == 0) |
190 | slog (L_WARN, _("%s(%s): received broadcast, but we are no router"), |
434 | slog (L_WARN, _("%s(%s): received broadcast (protocol violation)"), |
191 | c->conf->nodename, (const char *)rsi); |
435 | c->conf->nodename, (const char *)rsi); |
192 | else if (dst != 0 && dst != THISNODE->id) |
436 | else if (dst != THISNODE->id) |
193 | // FORWARDING NEEDED ;) |
437 | { |
|
|
438 | if (THISNODE->routerprio) |
|
|
439 | // the tos setting gets lost here. who cares. |
|
|
440 | conns[dst - 1]->inject_vpn_packet (pkt); |
|
|
441 | else |
194 | slog (L_WARN, |
442 | slog (L_WARN, |
195 | _("received frame for node %d ('%s') from %s, but this is node %d ('%s')"), |
443 | _("%s(%s): forwarding request (=> %s), but we are no router"), |
|
|
444 | c->conf->nodename, (const char *)rsi, |
196 | dst, conns[dst - 1]->conf->nodename, |
445 | conns[dst - 1]->conf->nodename); |
197 | (const char *)rsi, |
446 | } |
198 | THISNODE->id, THISNODE->nodename); |
|
|
199 | else |
447 | else |
200 | c->recv_vpn_packet (pkt, rsi); |
448 | c->recv_vpn_packet (pkt, rsi); |
201 | } |
449 | } |
202 | } |
450 | } |
203 | |
451 | |
|
|
452 | bool |
|
|
453 | vpn::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
|
|
454 | { |
|
|
455 | switch (si.prot) |
|
|
456 | { |
|
|
457 | case PROT_IPv4: |
|
|
458 | return send_ipv4_packet (pkt, si, tos); |
|
|
459 | case PROT_UDPv4: |
|
|
460 | return send_udpv4_packet (pkt, si, tos); |
|
|
461 | #if ENABLE_TCP |
|
|
462 | case PROT_TCPv4: |
|
|
463 | return send_tcpv4_packet (pkt, si, tos); |
|
|
464 | #endif |
|
|
465 | #if ENABLE_ICMP |
|
|
466 | case PROT_ICMPv4: |
|
|
467 | return send_icmpv4_packet (pkt, si, tos); |
|
|
468 | #endif |
|
|
469 | #if ENABLE_DNS |
|
|
470 | case PROT_DNSv4: |
|
|
471 | return send_dnsv4_packet (pkt, si, tos); |
|
|
472 | #endif |
|
|
473 | |
|
|
474 | default: |
|
|
475 | slog (L_CRIT, _("%s: FATAL: trying to send packet with unsupported protocol"), (const char *)si); |
|
|
476 | } |
|
|
477 | |
|
|
478 | return false; |
|
|
479 | } |
|
|
480 | |
204 | void |
481 | void |
205 | vpn::udpv4_ev (short revents) |
482 | vpn::ipv4_ev (io_watcher &w, short revents) |
206 | { |
483 | { |
207 | if (revents & (POLLIN | POLLERR)) |
484 | if (revents & EVENT_READ) |
208 | { |
485 | { |
209 | vpn_packet *pkt = new vpn_packet; |
486 | vpn_packet *pkt = new vpn_packet; |
210 | struct sockaddr_in sa; |
487 | struct sockaddr_in sa; |
211 | socklen_t sa_len = sizeof (sa); |
488 | socklen_t sa_len = sizeof (sa); |
212 | int len; |
489 | int len; |
213 | |
490 | |
214 | len = recvfrom (udpv4_fd, &((*pkt)[0]), MAXSIZE, 0, (sockaddr *)&sa, &sa_len); |
491 | len = recvfrom (w.fd, &((*pkt)[0]), MAXSIZE, 0, (sockaddr *)&sa, &sa_len); |
215 | |
492 | |
216 | sockinfo si(sa); |
493 | sockinfo si(sa, PROT_IPv4); |
217 | |
494 | |
218 | if (len > 0) |
495 | if (len > 0) |
219 | { |
496 | { |
220 | pkt->len = len; |
497 | pkt->len = len; |
|
|
498 | |
|
|
499 | // raw sockets deliver the ipv4 header, but don't expect it on sends |
|
|
500 | pkt->skip_hdr (IP_OVERHEAD); |
221 | |
501 | |
222 | recv_vpn_packet (pkt, si); |
502 | recv_vpn_packet (pkt, si); |
223 | } |
503 | } |
224 | else |
504 | else |
225 | { |
505 | { |
… | |
… | |
227 | slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno)); |
507 | slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno)); |
228 | } |
508 | } |
229 | |
509 | |
230 | delete pkt; |
510 | delete pkt; |
231 | } |
511 | } |
232 | else if (revents & POLLHUP) |
|
|
233 | { |
|
|
234 | // this cannot ;) happen on udp sockets |
|
|
235 | slog (L_ERR, _("FATAL: POLLHUP on udp v4 fd, terminating.")); |
|
|
236 | exit (1); |
|
|
237 | } |
|
|
238 | else |
512 | else |
239 | { |
513 | { |
240 | slog (L_ERR, |
514 | slog (L_ERR, |
241 | _("FATAL: unknown revents %08x in socket, terminating\n"), |
515 | _("FATAL: unknown revents %08x in socket, terminating\n"), |
242 | revents); |
516 | revents); |
243 | exit (1); |
517 | exit (EXIT_FAILURE); |
244 | } |
518 | } |
245 | } |
519 | } |
246 | |
520 | |
|
|
521 | #if ENABLE_ICMP |
247 | void |
522 | void |
248 | vpn::ipv4_ev (short revents) |
523 | vpn::icmpv4_ev (io_watcher &w, short revents) |
249 | { |
524 | { |
250 | if (revents & (POLLIN | POLLERR)) |
525 | if (revents & EVENT_READ) |
251 | { |
526 | { |
252 | vpn_packet *pkt = new vpn_packet; |
527 | vpn_packet *pkt = new vpn_packet; |
253 | struct sockaddr_in sa; |
528 | struct sockaddr_in sa; |
254 | socklen_t sa_len = sizeof (sa); |
529 | socklen_t sa_len = sizeof (sa); |
255 | int len; |
530 | int len; |
256 | |
531 | |
257 | len = recvfrom (ipv4_fd, &((*pkt)[0]), MAXSIZE, 0, (sockaddr *)&sa, &sa_len); |
532 | len = recvfrom (w.fd, &((*pkt)[0]), MAXSIZE, 0, (sockaddr *)&sa, &sa_len); |
258 | |
533 | |
259 | sockinfo si(sa, PROT_IPv4); |
534 | sockinfo si(sa, PROT_ICMPv4); |
260 | |
535 | |
261 | if (len > 0) |
536 | if (len > 0) |
262 | { |
537 | { |
263 | pkt->len = len; |
538 | pkt->len = len; |
264 | |
539 | |
|
|
540 | icmp_header *hdr = (icmp_header *)&((*pkt)[IP_OVERHEAD]); |
|
|
541 | |
|
|
542 | if (hdr->type == ::conf.icmp_type |
|
|
543 | && hdr->code == 255) |
|
|
544 | { |
265 | // raw sockets deliver the ipv4, but don't expect it on sends |
545 | // raw sockets deliver the ipv4, but don't expect it on sends |
266 | // this is slow, but... |
546 | // this is slow, but... |
267 | pkt->skip_hdr (IP_OVERHEAD); |
547 | pkt->skip_hdr (ICMP_OVERHEAD); |
268 | |
548 | |
269 | recv_vpn_packet (pkt, si); |
549 | recv_vpn_packet (pkt, si); |
|
|
550 | } |
270 | } |
551 | } |
271 | else |
552 | else |
272 | { |
553 | { |
273 | // probably ECONNRESET or somesuch |
554 | // probably ECONNRESET or somesuch |
274 | slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno)); |
555 | slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno)); |
275 | } |
556 | } |
276 | |
557 | |
277 | delete pkt; |
558 | delete pkt; |
278 | } |
|
|
279 | else if (revents & POLLHUP) |
|
|
280 | { |
|
|
281 | // this cannot ;) happen on udp sockets |
|
|
282 | slog (L_ERR, _("FATAL: POLLHUP on ipv4 fd, terminating.")); |
|
|
283 | exit (1); |
|
|
284 | } |
559 | } |
285 | else |
560 | else |
286 | { |
561 | { |
287 | slog (L_ERR, |
562 | slog (L_ERR, |
288 | _("FATAL: unknown revents %08x in socket, terminating\n"), |
563 | _("FATAL: unknown revents %08x in socket, terminating\n"), |
289 | revents); |
564 | revents); |
290 | exit (1); |
565 | exit (EXIT_FAILURE); |
|
|
566 | } |
|
|
567 | } |
|
|
568 | #endif |
|
|
569 | |
|
|
570 | void |
|
|
571 | vpn::udpv4_ev (io_watcher &w, short revents) |
|
|
572 | { |
|
|
573 | if (revents & EVENT_READ) |
291 | } |
574 | { |
292 | } |
575 | vpn_packet *pkt = new vpn_packet; |
|
|
576 | struct sockaddr_in sa; |
|
|
577 | socklen_t sa_len = sizeof (sa); |
|
|
578 | int len; |
293 | |
579 | |
|
|
580 | len = recvfrom (w.fd, &((*pkt)[0]), MAXSIZE, 0, (sockaddr *)&sa, &sa_len); |
|
|
581 | |
|
|
582 | sockinfo si(sa, PROT_UDPv4); |
|
|
583 | |
|
|
584 | if (len > 0) |
|
|
585 | { |
|
|
586 | pkt->len = len; |
|
|
587 | |
|
|
588 | recv_vpn_packet (pkt, si); |
|
|
589 | } |
|
|
590 | else |
|
|
591 | { |
|
|
592 | // probably ECONNRESET or somesuch |
|
|
593 | slog (L_DEBUG, _("%s: fd %d, %s"), (const char *)si, w.fd, strerror (errno)); |
|
|
594 | } |
|
|
595 | |
|
|
596 | delete pkt; |
|
|
597 | } |
|
|
598 | else |
|
|
599 | { |
|
|
600 | slog (L_ERR, |
|
|
601 | _("FATAL: unknown revents %08x in socket, terminating\n"), |
|
|
602 | revents); |
|
|
603 | exit (EXIT_FAILURE); |
|
|
604 | } |
|
|
605 | } |
|
|
606 | |
294 | void |
607 | void |
295 | vpn::tap_ev (short revents) |
608 | vpn::tap_ev (io_watcher &w, short revents) |
296 | { |
609 | { |
297 | if (revents & POLLIN) |
610 | if (revents & EVENT_READ) |
298 | { |
611 | { |
299 | /* process data */ |
612 | /* process data */ |
300 | tap_packet *pkt; |
613 | tap_packet *pkt; |
301 | |
614 | |
302 | pkt = tap->recv (); |
615 | pkt = tap->recv (); |
303 | |
616 | |
|
|
617 | if (!pkt) |
|
|
618 | return; |
|
|
619 | |
|
|
620 | if (pkt->len > 14) |
|
|
621 | { |
304 | int dst = mac2id (pkt->dst); |
622 | int dst = mac2id (pkt->dst); |
305 | int src = mac2id (pkt->src); |
623 | int src = mac2id (pkt->src); |
306 | |
624 | |
307 | if (src != THISNODE->id) |
625 | if (src != THISNODE->id) |
308 | { |
|
|
309 | slog (L_ERR, _("FATAL: tap packet not originating on current node received, terminating.")); |
|
|
310 | exit (1); |
|
|
311 | } |
|
|
312 | |
|
|
313 | if (dst == THISNODE->id) |
|
|
314 | { |
|
|
315 | slog (L_ERR, _("FATAL: tap packet destined for current node received, terminating.")); |
|
|
316 | exit (1); |
|
|
317 | } |
|
|
318 | |
|
|
319 | if (dst > conns.size ()) |
|
|
320 | slog (L_ERR, _("tap packet for unknown node %d received, ignoring."), dst); |
|
|
321 | else |
|
|
322 | { |
|
|
323 | if (dst) |
|
|
324 | { |
626 | { |
325 | // unicast |
627 | slog (L_ERR, _("FATAL: tap packet not originating on current node received (if-up script not working properly?), exiting.")); |
326 | if (dst != THISNODE->id) |
628 | exit (EXIT_FAILURE); |
327 | conns[dst - 1]->inject_data_packet (pkt); |
|
|
328 | } |
629 | } |
|
|
630 | |
|
|
631 | if (dst == THISNODE->id) |
|
|
632 | { |
|
|
633 | slog (L_ERR, _("FATAL: tap packet destined for current node received, exiting.")); |
|
|
634 | exit (EXIT_FAILURE); |
|
|
635 | } |
|
|
636 | |
|
|
637 | if (dst > conns.size ()) |
|
|
638 | slog (L_ERR, _("tap packet for unknown node %d received, ignoring."), dst); |
329 | else |
639 | else |
330 | { |
|
|
331 | // broadcast, first check router, then self, then english |
|
|
332 | connection *router = find_router (); |
|
|
333 | |
|
|
334 | if (router) |
|
|
335 | router->inject_data_packet (pkt, true); |
640 | inject_data_packet (pkt, dst); |
336 | else |
|
|
337 | for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c) |
|
|
338 | if ((*c)->conf != THISNODE) |
|
|
339 | (*c)->inject_data_packet (pkt); |
|
|
340 | } |
|
|
341 | } |
641 | } |
342 | |
642 | |
343 | delete pkt; |
643 | delete pkt; |
344 | } |
|
|
345 | else if (revents & (POLLHUP | POLLERR)) |
|
|
346 | { |
|
|
347 | slog (L_ERR, _("FATAL: POLLHUP or POLLERR on network device fd, terminating.")); |
|
|
348 | exit (1); |
|
|
349 | } |
644 | } |
350 | else |
645 | else |
351 | abort (); |
646 | abort (); |
352 | } |
647 | } |
353 | |
648 | |
354 | void |
649 | void |
355 | vpn::event_cb (tstamp &ts) |
650 | vpn::event_cb (time_watcher &w) |
356 | { |
651 | { |
357 | if (events) |
652 | if (events) |
358 | { |
653 | { |
359 | if (events & EVENT_SHUTDOWN) |
654 | if (events & EVENT_SHUTDOWN) |
360 | { |
655 | { |
361 | slog (L_INFO, _("preparing shutdown...")); |
656 | slog (L_INFO, _("preparing shutdown...")); |
362 | |
657 | |
363 | shutdown_all (); |
658 | shutdown_all (); |
364 | |
|
|
365 | remove_pid (pidfilename); |
659 | remove_pid (conf.pidfilename); |
366 | |
|
|
367 | slog (L_INFO, _("terminating")); |
660 | slog (L_INFO, _("terminating")); |
368 | |
661 | exit (EXIT_SUCCESS); |
369 | exit (0); |
|
|
370 | } |
662 | } |
371 | |
663 | |
372 | if (events & EVENT_RECONNECT) |
664 | if (events & EVENT_RECONNECT) |
373 | { |
665 | { |
374 | slog (L_INFO, _("forced reconnect")); |
666 | slog (L_INFO, _("forced reconnect")); |
… | |
… | |
376 | reconnect_all (); |
668 | reconnect_all (); |
377 | } |
669 | } |
378 | |
670 | |
379 | events = 0; |
671 | events = 0; |
380 | } |
672 | } |
381 | |
|
|
382 | ts = TSTAMP_CANCEL; |
|
|
383 | } |
673 | } |
384 | |
674 | |
385 | void |
675 | void |
386 | vpn::shutdown_all () |
676 | vpn::shutdown_all () |
387 | { |
677 | { |
… | |
… | |
400 | connection_init (); |
690 | connection_init (); |
401 | |
691 | |
402 | for (configuration::node_vector::iterator i = conf.nodes.begin (); |
692 | for (configuration::node_vector::iterator i = conf.nodes.begin (); |
403 | i != conf.nodes.end (); ++i) |
693 | i != conf.nodes.end (); ++i) |
404 | { |
694 | { |
405 | connection *conn = new connection (this); |
695 | connection *conn = new connection (this, *i); |
406 | |
|
|
407 | conn->conf = *i; |
|
|
408 | conns.push_back (conn); |
696 | conns.push_back (conn); |
409 | |
|
|
410 | conn->establish_connection (); |
697 | conn->establish_connection (); |
411 | } |
698 | } |
412 | } |
699 | } |
413 | |
700 | |
414 | connection *vpn::find_router () |
701 | connection *vpn::find_router () |
415 | { |
702 | { |
416 | u32 prio = 0; |
703 | u32 prio = 1; |
417 | connection *router = 0; |
704 | connection *router = 0; |
418 | |
705 | |
419 | for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i) |
706 | for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i) |
420 | { |
707 | { |
421 | connection *c = *i; |
708 | connection *c = *i; |
422 | |
709 | |
423 | if (c->conf->routerprio > prio |
710 | if (c->conf->routerprio > prio |
424 | && c->connectmode == conf_node::C_ALWAYS |
711 | && c->connectmode == conf_node::C_ALWAYS // so we don't drop the connection if in use |
425 | && c->conf != THISNODE |
|
|
426 | && c->ictx && c->octx) |
712 | && c->ictx && c->octx |
|
|
713 | && c->conf != THISNODE) // redundant, since ictx==octx==0 always on thisnode |
427 | { |
714 | { |
428 | prio = c->conf->routerprio; |
715 | prio = c->conf->routerprio; |
429 | router = c; |
716 | router = c; |
430 | } |
717 | } |
431 | } |
718 | } |
432 | |
719 | |
433 | return router; |
720 | return router; |
434 | } |
721 | } |
435 | |
722 | |
436 | void vpn::connect_request (int id) |
723 | void vpn::send_connect_request (int id) |
437 | { |
724 | { |
438 | connection *c = find_router (); |
725 | connection *c = find_router (); |
439 | |
726 | |
440 | if (c) |
727 | if (c) |
441 | c->connect_request (id); |
728 | c->send_connect_request (id); |
442 | //else // does not work, because all others must connect to the same router |
729 | else |
443 | // // no router found, aggressively connect to all routers |
730 | // no router found, aggressively connect to all routers |
444 | // for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i) |
731 | for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i) |
445 | // if ((*i)->conf->routerprio) |
732 | if ((*i)->conf->routerprio && (*i)->conf != THISNODE) |
446 | // (*i)->establish_connection (); |
733 | (*i)->establish_connection (); |
447 | } |
734 | } |
448 | |
735 | |
449 | void |
736 | void |
450 | connection::dump_status () |
737 | connection::dump_status () |
451 | { |
738 | { |
… | |
… | |
468 | |
755 | |
469 | slog (L_NOTICE, _("END status dump")); |
756 | slog (L_NOTICE, _("END status dump")); |
470 | } |
757 | } |
471 | |
758 | |
472 | vpn::vpn (void) |
759 | vpn::vpn (void) |
|
|
760 | : event (this, &vpn::event_cb) |
473 | : udpv4_ev_watcher(this, &vpn::udpv4_ev) |
761 | , udpv4_ev_watcher (this, &vpn::udpv4_ev) |
474 | , ipv4_ev_watcher(this, &vpn::ipv4_ev) |
762 | , ipv4_ev_watcher (this, &vpn::ipv4_ev) |
|
|
763 | #if ENABLE_TCP |
|
|
764 | , tcpv4_ev_watcher (this, &vpn::tcpv4_ev) |
|
|
765 | #endif |
|
|
766 | #if ENABLE_ICMP |
|
|
767 | , icmpv4_ev_watcher(this, &vpn::icmpv4_ev) |
|
|
768 | #endif |
|
|
769 | #if ENABLE_DNS |
|
|
770 | , dnsv4_ev_watcher (this, &vpn::dnsv4_ev) |
|
|
771 | #endif |
475 | , tap_ev_watcher(this, &vpn::tap_ev) |
772 | , tap_ev_watcher (this, &vpn::tap_ev) |
476 | , event(this, &vpn::event_cb) |
|
|
477 | { |
773 | { |
478 | } |
774 | } |
479 | |
775 | |
480 | vpn::~vpn () |
776 | vpn::~vpn () |
481 | { |
777 | { |