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. 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 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 () |
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 | { |
… | |
… | |
80 | ipv4_fd = socket (PF_INET, SOCK_RAW, ::conf.ip_proto); |
107 | ipv4_fd = socket (PF_INET, SOCK_RAW, ::conf.ip_proto); |
81 | |
108 | |
82 | if (ipv4_fd < 0) |
109 | if (ipv4_fd < 0) |
83 | return -1; |
110 | return -1; |
84 | |
111 | |
85 | sockinfo si (THISNODE, PROT_IPv4); |
112 | fcntl (ipv4_fd, F_SETFL, O_NONBLOCK); |
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113 | fcntl (ipv4_fd, F_SETFD, FD_CLOEXEC); |
86 | |
114 | |
87 | if (bind (ipv4_fd, si.sav4 (), si.salenv4 ())) |
115 | #if defined(SOL_IP) && defined(IP_MTU_DISCOVER) |
88 | { |
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89 | slog (L_ERR, _("can't bind ipv4 socket on %s: %s"), (const char *)si, strerror (errno)); |
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90 | exit (1); |
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91 | } |
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92 | |
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93 | #ifdef IP_MTU_DISCOVER |
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94 | // this I really consider a linux bug. I am neither connected |
116 | // this I really consider a linux bug. I am neither connected |
95 | // nor do I fragment myself. Linux still sets DF and doesn't |
117 | // nor do I fragment myself. Linux still sets DF and doesn't |
96 | // fragment for me sometimes. |
118 | // fragment for me sometimes. |
97 | { |
119 | { |
98 | int oval = IP_PMTUDISC_DONT; |
120 | int oval = IP_PMTUDISC_DONT; |
99 | setsockopt (ipv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval); |
121 | setsockopt (ipv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval); |
100 | } |
122 | } |
101 | #endif |
123 | #endif |
102 | |
124 | |
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125 | sockinfo si (THISNODE, PROT_IPv4); |
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126 | |
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127 | if (bind (ipv4_fd, si.sav4 (), si.salenv4 ())) |
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128 | { |
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129 | slog (L_ERR, _("can't bind ipv4 socket on %s: %s"), (const char *)si, strerror (errno)); |
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130 | exit (EXIT_FAILURE); |
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131 | } |
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132 | |
103 | ipv4_ev_watcher.start (ipv4_fd, POLLIN); |
133 | ipv4_ev_watcher.start (ipv4_fd, EVENT_READ); |
104 | } |
134 | } |
105 | |
135 | |
106 | udpv4_fd = -1; |
136 | udpv4_fd = -1; |
107 | |
137 | |
108 | if (THISNODE->protocols & PROT_UDPv4 && THISNODE->udp_port) |
138 | if (THISNODE->protocols & PROT_UDPv4 && THISNODE->udp_port) |
109 | { |
139 | { |
110 | udpv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP); |
140 | udpv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP); |
111 | |
141 | |
112 | if (udpv4_fd < 0) |
142 | if (udpv4_fd < 0) |
113 | return -1; |
143 | return -1; |
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144 | |
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145 | fcntl (udpv4_fd, F_SETFL, O_NONBLOCK); |
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146 | fcntl (udpv4_fd, F_SETFD, FD_CLOEXEC); |
114 | |
147 | |
115 | // standard daemon practise... |
148 | // standard daemon practise... |
116 | { |
149 | { |
117 | int oval = 1; |
150 | int oval = 1; |
118 | setsockopt (udpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval); |
151 | setsockopt (udpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval); |
119 | } |
152 | } |
120 | |
153 | |
121 | sockinfo si (THISNODE, PROT_UDPv4); |
154 | #if defined(SOL_IP) && defined(IP_MTU_DISCOVER) |
122 | |
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123 | if (bind (udpv4_fd, si.sav4 (), si.salenv4 ())) |
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124 | { |
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125 | slog (L_ERR, _("can't bind udpv4 on %s: %s"), (const char *)si, strerror (errno)); |
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126 | exit (1); |
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127 | } |
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128 | |
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129 | #ifdef IP_MTU_DISCOVER |
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130 | // this I really consider a linux bug. I am neither connected |
155 | // this I really consider a linux bug. I am neither connected |
131 | // nor do I fragment myself. Linux still sets DF and doesn't |
156 | // nor do I fragment myself. Linux still sets DF and doesn't |
132 | // fragment for me sometimes. |
157 | // fragment for me sometimes. |
133 | { |
158 | { |
134 | int oval = IP_PMTUDISC_DONT; |
159 | int oval = IP_PMTUDISC_DONT; |
135 | setsockopt (udpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval); |
160 | setsockopt (udpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval); |
136 | } |
161 | } |
137 | #endif |
162 | #endif |
138 | |
163 | |
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164 | sockinfo si (THISNODE, PROT_UDPv4); |
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165 | |
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166 | if (bind (udpv4_fd, si.sav4 (), si.salenv4 ())) |
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167 | { |
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168 | slog (L_ERR, _("can't bind udpv4 on %s: %s"), (const char *)si, strerror (errno)); |
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169 | exit (EXIT_FAILURE); |
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170 | } |
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171 | |
139 | udpv4_ev_watcher.start (udpv4_fd, POLLIN); |
172 | udpv4_ev_watcher.start (udpv4_fd, EVENT_READ); |
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173 | } |
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174 | |
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175 | icmpv4_fd = -1; |
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176 | |
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177 | #if ENABLE_ICMP |
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178 | if (THISNODE->protocols & PROT_ICMPv4) |
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179 | { |
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180 | icmpv4_fd = socket (PF_INET, SOCK_RAW, IPPROTO_ICMP); |
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181 | |
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182 | if (icmpv4_fd < 0) |
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183 | return -1; |
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184 | |
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185 | fcntl (icmpv4_fd, F_SETFL, O_NONBLOCK); |
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186 | fcntl (icmpv4_fd, F_SETFD, FD_CLOEXEC); |
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187 | |
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188 | #ifdef ICMP_FILTER |
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189 | { |
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190 | icmp_filter oval; |
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191 | oval.data = 0xffffffff; |
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192 | if (::conf.icmp_type < 32) |
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193 | oval.data &= ~(1 << ::conf.icmp_type); |
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194 | |
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195 | setsockopt (icmpv4_fd, SOL_RAW, ICMP_FILTER, &oval, sizeof oval); |
140 | } |
196 | } |
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197 | #endif |
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198 | |
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199 | #if defined(SOL_IP) && defined(IP_MTU_DISCOVER) |
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200 | // this I really consider a linux bug. I am neither connected |
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201 | // nor do I fragment myself. Linux still sets DF and doesn't |
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202 | // fragment for me sometimes. |
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203 | { |
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204 | int oval = IP_PMTUDISC_DONT; |
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205 | setsockopt (icmpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval); |
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206 | } |
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207 | #endif |
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208 | |
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209 | sockinfo si (THISNODE, PROT_ICMPv4); |
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210 | |
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211 | if (bind (icmpv4_fd, si.sav4 (), si.salenv4 ())) |
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212 | { |
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213 | slog (L_ERR, _("can't bind icmpv4 on %s: %s"), (const char *)si, strerror (errno)); |
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214 | exit (EXIT_FAILURE); |
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215 | } |
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216 | |
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217 | icmpv4_ev_watcher.start (icmpv4_fd, EVENT_READ); |
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218 | } |
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219 | #endif |
141 | |
220 | |
142 | tcpv4_fd = -1; |
221 | tcpv4_fd = -1; |
143 | |
222 | |
144 | #if ENABLE_TCP |
223 | #if ENABLE_TCP |
145 | if (THISNODE->protocols & PROT_TCPv4 && THISNODE->tcp_port) |
224 | if (THISNODE->protocols & PROT_TCPv4 && THISNODE->tcp_port) |
146 | { |
225 | { |
147 | tcpv4_fd = socket (PF_INET, SOCK_STREAM, IPPROTO_TCP); |
226 | tcpv4_fd = socket (PF_INET, SOCK_STREAM, IPPROTO_TCP); |
148 | |
227 | |
149 | if (tcpv4_fd < 0) |
228 | if (tcpv4_fd < 0) |
150 | return -1; |
229 | return -1; |
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230 | |
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231 | fcntl (tcpv4_fd, F_SETFL, O_NONBLOCK); |
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232 | fcntl (tcpv4_fd, F_SETFD, FD_CLOEXEC); |
151 | |
233 | |
152 | // standard daemon practise... |
234 | // standard daemon practise... |
153 | { |
235 | { |
154 | int oval = 1; |
236 | int oval = 1; |
155 | setsockopt (tcpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval); |
237 | setsockopt (tcpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval); |
… | |
… | |
158 | sockinfo si (THISNODE, PROT_TCPv4); |
240 | sockinfo si (THISNODE, PROT_TCPv4); |
159 | |
241 | |
160 | if (bind (tcpv4_fd, si.sav4 (), si.salenv4 ())) |
242 | if (bind (tcpv4_fd, si.sav4 (), si.salenv4 ())) |
161 | { |
243 | { |
162 | slog (L_ERR, _("can't bind tcpv4 on %s: %s"), (const char *)si, strerror (errno)); |
244 | slog (L_ERR, _("can't bind tcpv4 on %s: %s"), (const char *)si, strerror (errno)); |
163 | exit (1); |
245 | exit (EXIT_FAILURE); |
164 | } |
246 | } |
165 | |
247 | |
166 | if (listen (tcpv4_fd, 5)) |
248 | if (listen (tcpv4_fd, 5)) |
167 | { |
249 | { |
168 | slog (L_ERR, _("can't listen tcpv4 on %s: %s"), (const char *)si, strerror (errno)); |
250 | slog (L_ERR, _("can't listen tcpv4 on %s: %s"), (const char *)si, strerror (errno)); |
169 | exit (1); |
251 | exit (EXIT_FAILURE); |
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252 | } |
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253 | |
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254 | tcpv4_ev_watcher.start (tcpv4_fd, EVENT_READ); |
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255 | } |
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256 | #endif |
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257 | |
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258 | #if ENABLE_DNS |
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259 | if (THISNODE->protocols & PROT_DNSv4) |
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260 | { |
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261 | dns_forwarder.set (::conf.dns_forw_host, ::conf.dns_forw_port, PROT_DNSv4); |
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262 | |
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263 | dnsv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP); |
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264 | |
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265 | if (dnsv4_fd < 0) |
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266 | return -1; |
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267 | |
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268 | fcntl (dnsv4_fd, F_SETFL, O_NONBLOCK); |
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269 | fcntl (dnsv4_fd, F_SETFD, FD_CLOEXEC); |
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270 | |
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271 | # if defined(SOL_IP) && defined(IP_MTU_DISCOVER) |
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272 | // this I really consider a linux bug. I am neither connected |
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273 | // nor do I fragment myself. Linux still sets DF and doesn't |
|
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274 | // fragment for me sometimes. |
|
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275 | { |
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276 | int oval = IP_PMTUDISC_DONT; |
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277 | setsockopt (dnsv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval); |
170 | } |
278 | } |
171 | |
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172 | tcpv4_ev_watcher.start (tcpv4_fd, POLLIN); |
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173 | } |
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174 | #endif |
279 | # endif |
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280 | |
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281 | // standard daemon practise... |
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282 | { |
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283 | int oval = 1; |
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284 | setsockopt (dnsv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval); |
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285 | } |
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286 | |
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287 | sockinfo si (THISNODE->dns_hostname, |
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288 | THISNODE->dns_hostname ? THISNODE->dns_port : 0, |
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289 | PROT_DNSv4); |
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290 | |
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291 | if (bind (dnsv4_fd, si.sav4 (), si.salenv4 ())) |
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292 | { |
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293 | slog (L_ERR, _("can't bind dnsv4 on %s: %s"), (const char *)si, strerror (errno)); |
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294 | exit (EXIT_FAILURE); |
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295 | } |
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296 | |
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297 | dnsv4_ev_watcher.start (dnsv4_fd, EVENT_READ); |
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298 | } |
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299 | #endif |
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300 | |
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301 | ///////////////////////////////////////////////////////////////////////////// |
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302 | |
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303 | reconnect_all (); |
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304 | |
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305 | ///////////////////////////////////////////////////////////////////////////// |
175 | |
306 | |
176 | tap = new tap_device (); |
307 | tap = new tap_device (); |
177 | if (!tap) //D this, of course, never catches |
308 | if (!tap) //D this, of course, never catches |
178 | { |
309 | { |
179 | slog (L_ERR, _("cannot create network interface '%s'"), conf.ifname); |
310 | slog (L_ERR, _("cannot create network interface '%s'"), conf.ifname); |
180 | exit (1); |
311 | exit (EXIT_FAILURE); |
181 | } |
312 | } |
182 | |
313 | |
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314 | fcntl (tap->fd, F_SETFD, FD_CLOEXEC); |
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315 | |
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316 | if (tap->if_up () && |
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317 | !run_script (run_script_cb (this, &vpn::script_if_init), true)) |
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318 | { |
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319 | slog (L_ERR, _("interface initialization command '%s' failed, exiting."), |
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320 | tap->if_up ()); |
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321 | exit (EXIT_FAILURE); |
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322 | } |
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323 | |
183 | run_script (run_script_cb (this, &vpn::script_if_up), true); |
324 | if (!run_script (run_script_cb (this, &vpn::script_if_up), true)) |
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325 | { |
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326 | slog (L_ERR, _("if-up command execution failed, exiting.")); |
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327 | exit (EXIT_FAILURE); |
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328 | } |
184 | |
329 | |
185 | tap_ev_watcher.start (tap->fd, POLLIN); |
330 | tap_ev_watcher.start (tap->fd, EVENT_READ); |
186 | |
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187 | reconnect_all (); |
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188 | |
331 | |
189 | return 0; |
332 | return 0; |
190 | } |
|
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191 | |
|
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192 | // send a vpn packet out to other hosts |
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193 | bool |
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194 | vpn::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
|
|
195 | { |
|
|
196 | switch (si.prot) |
|
|
197 | { |
|
|
198 | case PROT_IPv4: |
|
|
199 | return send_ipv4_packet (pkt, si, tos); |
|
|
200 | |
|
|
201 | case PROT_UDPv4: |
|
|
202 | return send_udpv4_packet (pkt, si, tos); |
|
|
203 | |
|
|
204 | #if ENABLE_TCP |
|
|
205 | case PROT_TCPv4: |
|
|
206 | return send_tcpv4_packet (pkt, si, tos); |
|
|
207 | #endif |
|
|
208 | |
|
|
209 | default: |
|
|
210 | slog (L_CRIT, _("%s: FATAL: trying to send packet with unsupported protocol"), (const char *)si); |
|
|
211 | return false; |
|
|
212 | } |
|
|
213 | } |
333 | } |
214 | |
334 | |
215 | bool |
335 | bool |
216 | vpn::send_ipv4_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
336 | vpn::send_ipv4_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
217 | { |
337 | { |
|
|
338 | #if defined(SOL_IP) && defined(IP_TOS) |
218 | setsockopt (ipv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos); |
339 | setsockopt (ipv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos); |
|
|
340 | #endif |
219 | sendto (ipv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ()); |
341 | sendto (ipv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ()); |
220 | |
342 | |
221 | return true; |
343 | return true; |
222 | } |
344 | } |
|
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345 | |
|
|
346 | static u16 |
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|
347 | ipv4_checksum (u16 *data, unsigned int len) |
|
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348 | { |
|
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349 | // use 32 bit accumulator and fold back carry bits at the end |
|
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350 | u32 sum = 0; |
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351 | |
|
|
352 | while (len > 1) |
|
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353 | { |
|
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354 | sum += *data++; |
|
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355 | len -= 2; |
|
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356 | } |
|
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357 | |
|
|
358 | // odd byte left? |
|
|
359 | if (len) |
|
|
360 | sum += *(u8 *)data; |
|
|
361 | |
|
|
362 | // add back carry bits |
|
|
363 | sum = (sum >> 16) + (sum & 0xffff); // lo += hi |
|
|
364 | sum += (sum >> 16); // carry |
|
|
365 | |
|
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366 | return ~sum; |
|
|
367 | } |
|
|
368 | |
|
|
369 | #if ENABLE_ICMP |
|
|
370 | bool |
|
|
371 | vpn::send_icmpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
|
|
372 | { |
|
|
373 | #if defined(SOL_IP) && defined(IP_TOS) |
|
|
374 | setsockopt (icmpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos); |
|
|
375 | #endif |
|
|
376 | |
|
|
377 | pkt->unshift_hdr (4); |
|
|
378 | |
|
|
379 | icmp_header *hdr = (icmp_header *)&((*pkt)[0]); |
|
|
380 | hdr->type = ::conf.icmp_type; |
|
|
381 | hdr->code = 255; |
|
|
382 | hdr->checksum = 0; |
|
|
383 | hdr->checksum = ipv4_checksum ((u16 *)hdr, pkt->len); |
|
|
384 | |
|
|
385 | sendto (icmpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ()); |
|
|
386 | |
|
|
387 | return true; |
|
|
388 | } |
|
|
389 | #endif |
223 | |
390 | |
224 | bool |
391 | bool |
225 | vpn::send_udpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
392 | vpn::send_udpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
226 | { |
393 | { |
|
|
394 | #if defined(SOL_IP) && defined(IP_TOS) |
227 | setsockopt (udpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos); |
395 | setsockopt (udpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos); |
|
|
396 | #endif |
228 | sendto (udpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ()); |
397 | sendto (udpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ()); |
229 | |
398 | |
230 | return true; |
399 | return true; |
|
|
400 | } |
|
|
401 | |
|
|
402 | void |
|
|
403 | vpn::inject_data_packet (tap_packet *pkt, int dst) |
|
|
404 | { |
|
|
405 | if (dst) |
|
|
406 | { |
|
|
407 | // unicast |
|
|
408 | if (dst != THISNODE->id) |
|
|
409 | conns[dst - 1]->inject_data_packet (pkt); |
|
|
410 | } |
|
|
411 | else |
|
|
412 | { |
|
|
413 | // broadcast, this is ugly, but due to the security policy |
|
|
414 | // we have to connect to all hosts... |
|
|
415 | for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c) |
|
|
416 | if ((*c)->conf != THISNODE) |
|
|
417 | (*c)->inject_data_packet (pkt, true); |
|
|
418 | } |
231 | } |
419 | } |
232 | |
420 | |
233 | void |
421 | void |
234 | vpn::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi) |
422 | vpn::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi) |
235 | { |
423 | { |
… | |
… | |
249 | (const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ()); |
437 | (const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ()); |
250 | else |
438 | else |
251 | { |
439 | { |
252 | connection *c = conns[src - 1]; |
440 | connection *c = conns[src - 1]; |
253 | |
441 | |
254 | if (dst == 0 && !THISNODE->routerprio) |
442 | if (dst == 0) |
255 | slog (L_WARN, _("%s(%s): received broadcast, but we are no router"), |
443 | slog (L_WARN, _("%s(%s): received broadcast (protocol violation)"), |
256 | c->conf->nodename, (const char *)rsi); |
444 | c->conf->nodename, (const char *)rsi); |
257 | else if (dst != 0 && dst != THISNODE->id) |
445 | else if (dst != THISNODE->id) |
258 | { |
446 | { |
259 | if (THISNODE->routerprio) |
447 | if (THISNODE->routerprio) |
260 | // the tos setting gets lost here. who cares. |
448 | // the tos setting gets lost here. who cares. |
261 | conns[dst - 1]->inject_vpn_packet (pkt); |
449 | conns[dst - 1]->inject_vpn_packet (pkt); |
262 | else |
450 | else |
… | |
… | |
268 | else |
456 | else |
269 | c->recv_vpn_packet (pkt, rsi); |
457 | c->recv_vpn_packet (pkt, rsi); |
270 | } |
458 | } |
271 | } |
459 | } |
272 | |
460 | |
|
|
461 | bool |
|
|
462 | vpn::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
|
|
463 | { |
|
|
464 | switch (si.prot) |
|
|
465 | { |
|
|
466 | case PROT_IPv4: |
|
|
467 | return send_ipv4_packet (pkt, si, tos); |
|
|
468 | case PROT_UDPv4: |
|
|
469 | return send_udpv4_packet (pkt, si, tos); |
|
|
470 | #if ENABLE_TCP |
|
|
471 | case PROT_TCPv4: |
|
|
472 | return send_tcpv4_packet (pkt, si, tos); |
|
|
473 | #endif |
|
|
474 | #if ENABLE_ICMP |
|
|
475 | case PROT_ICMPv4: |
|
|
476 | return send_icmpv4_packet (pkt, si, tos); |
|
|
477 | #endif |
|
|
478 | #if ENABLE_DNS |
|
|
479 | case PROT_DNSv4: |
|
|
480 | return send_dnsv4_packet (pkt, si, tos); |
|
|
481 | #endif |
|
|
482 | |
|
|
483 | default: |
|
|
484 | slog (L_CRIT, _("%s: FATAL: trying to send packet with unsupported protocol"), (const char *)si); |
|
|
485 | } |
|
|
486 | |
|
|
487 | return false; |
|
|
488 | } |
|
|
489 | |
273 | void |
490 | void |
274 | vpn::udpv4_ev (io_watcher &w, short revents) |
491 | vpn::ipv4_ev (io_watcher &w, short revents) |
275 | { |
492 | { |
276 | if (revents & (POLLIN | POLLERR)) |
493 | if (revents & EVENT_READ) |
277 | { |
494 | { |
278 | vpn_packet *pkt = new vpn_packet; |
495 | vpn_packet *pkt = new vpn_packet; |
279 | struct sockaddr_in sa; |
496 | struct sockaddr_in sa; |
280 | socklen_t sa_len = sizeof (sa); |
497 | socklen_t sa_len = sizeof (sa); |
281 | int len; |
498 | int len; |
282 | |
499 | |
283 | len = recvfrom (w.fd, &((*pkt)[0]), MAXSIZE, 0, (sockaddr *)&sa, &sa_len); |
500 | len = recvfrom (w.fd, &((*pkt)[0]), MAXSIZE, 0, (sockaddr *)&sa, &sa_len); |
284 | |
501 | |
285 | sockinfo si(sa, PROT_UDPv4); |
502 | sockinfo si(sa, PROT_IPv4); |
286 | |
503 | |
287 | if (len > 0) |
504 | if (len > 0) |
288 | { |
505 | { |
289 | pkt->len = len; |
506 | pkt->len = len; |
290 | |
507 | |
|
|
508 | // raw sockets deliver the ipv4 header, but don't expect it on sends |
|
|
509 | pkt->skip_hdr (IP_OVERHEAD); |
|
|
510 | |
291 | recv_vpn_packet (pkt, si); |
511 | recv_vpn_packet (pkt, si); |
292 | } |
512 | } |
293 | else |
513 | else |
294 | { |
514 | { |
295 | // probably ECONNRESET or somesuch |
515 | // probably ECONNRESET or somesuch |
296 | slog (L_DEBUG, _("%s: fd %d, %s"), (const char *)si, w.fd, strerror (errno)); |
516 | slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno)); |
297 | } |
517 | } |
298 | |
518 | |
299 | delete pkt; |
519 | delete pkt; |
300 | } |
520 | } |
301 | else if (revents & POLLHUP) |
|
|
302 | { |
|
|
303 | // this cannot ;) happen on udp sockets |
|
|
304 | slog (L_ERR, _("FATAL: POLLHUP on udp v4 fd, terminating.")); |
|
|
305 | exit (1); |
|
|
306 | } |
|
|
307 | else |
521 | else |
308 | { |
522 | { |
309 | slog (L_ERR, |
523 | slog (L_ERR, |
310 | _("FATAL: unknown revents %08x in socket, terminating\n"), |
524 | _("FATAL: unknown revents %08x in socket, terminating\n"), |
311 | revents); |
525 | revents); |
312 | exit (1); |
526 | exit (EXIT_FAILURE); |
313 | } |
527 | } |
314 | } |
528 | } |
315 | |
529 | |
|
|
530 | #if ENABLE_ICMP |
316 | void |
531 | void |
317 | vpn::ipv4_ev (io_watcher &w, short revents) |
532 | vpn::icmpv4_ev (io_watcher &w, short revents) |
318 | { |
533 | { |
319 | if (revents & (POLLIN | POLLERR)) |
534 | if (revents & EVENT_READ) |
320 | { |
535 | { |
321 | vpn_packet *pkt = new vpn_packet; |
536 | vpn_packet *pkt = new vpn_packet; |
322 | struct sockaddr_in sa; |
537 | struct sockaddr_in sa; |
323 | socklen_t sa_len = sizeof (sa); |
538 | socklen_t sa_len = sizeof (sa); |
324 | int len; |
539 | int len; |
325 | |
540 | |
326 | len = recvfrom (w.fd, &((*pkt)[0]), MAXSIZE, 0, (sockaddr *)&sa, &sa_len); |
541 | len = recvfrom (w.fd, &((*pkt)[0]), MAXSIZE, 0, (sockaddr *)&sa, &sa_len); |
327 | |
542 | |
328 | sockinfo si(sa, PROT_IPv4); |
543 | sockinfo si(sa, PROT_ICMPv4); |
329 | |
544 | |
330 | if (len > 0) |
545 | if (len > 0) |
331 | { |
546 | { |
332 | pkt->len = len; |
547 | pkt->len = len; |
333 | |
548 | |
|
|
549 | icmp_header *hdr = (icmp_header *)&((*pkt)[IP_OVERHEAD]); |
|
|
550 | |
|
|
551 | if (hdr->type == ::conf.icmp_type |
|
|
552 | && hdr->code == 255) |
|
|
553 | { |
334 | // raw sockets deliver the ipv4, but don't expect it on sends |
554 | // raw sockets deliver the ipv4, but don't expect it on sends |
335 | // this is slow, but... |
555 | // this is slow, but... |
336 | pkt->skip_hdr (IP_OVERHEAD); |
556 | pkt->skip_hdr (ICMP_OVERHEAD); |
337 | |
557 | |
338 | recv_vpn_packet (pkt, si); |
558 | recv_vpn_packet (pkt, si); |
|
|
559 | } |
339 | } |
560 | } |
340 | else |
561 | else |
341 | { |
562 | { |
342 | // probably ECONNRESET or somesuch |
563 | // probably ECONNRESET or somesuch |
343 | slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno)); |
564 | slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno)); |
344 | } |
565 | } |
345 | |
566 | |
346 | delete pkt; |
567 | delete pkt; |
347 | } |
|
|
348 | else if (revents & POLLHUP) |
|
|
349 | { |
|
|
350 | // this cannot ;) happen on udp sockets |
|
|
351 | slog (L_ERR, _("FATAL: POLLHUP on ipv4 fd, terminating.")); |
|
|
352 | exit (1); |
|
|
353 | } |
568 | } |
354 | else |
569 | else |
355 | { |
570 | { |
356 | slog (L_ERR, |
571 | slog (L_ERR, |
357 | _("FATAL: unknown revents %08x in socket, terminating\n"), |
572 | _("FATAL: unknown revents %08x in socket, terminating\n"), |
358 | revents); |
573 | revents); |
359 | exit (1); |
574 | exit (EXIT_FAILURE); |
|
|
575 | } |
|
|
576 | } |
|
|
577 | #endif |
|
|
578 | |
|
|
579 | void |
|
|
580 | vpn::udpv4_ev (io_watcher &w, short revents) |
|
|
581 | { |
|
|
582 | if (revents & EVENT_READ) |
|
|
583 | { |
|
|
584 | vpn_packet *pkt = new vpn_packet; |
|
|
585 | struct sockaddr_in sa; |
|
|
586 | socklen_t sa_len = sizeof (sa); |
|
|
587 | int len; |
|
|
588 | |
|
|
589 | len = recvfrom (w.fd, &((*pkt)[0]), MAXSIZE, 0, (sockaddr *)&sa, &sa_len); |
|
|
590 | |
|
|
591 | sockinfo si(sa, PROT_UDPv4); |
|
|
592 | |
|
|
593 | if (len > 0) |
|
|
594 | { |
|
|
595 | pkt->len = len; |
|
|
596 | |
|
|
597 | recv_vpn_packet (pkt, si); |
|
|
598 | } |
|
|
599 | else |
|
|
600 | { |
|
|
601 | // probably ECONNRESET or somesuch |
|
|
602 | slog (L_DEBUG, _("%s: fd %d, %s"), (const char *)si, w.fd, strerror (errno)); |
|
|
603 | } |
|
|
604 | |
|
|
605 | delete pkt; |
|
|
606 | } |
|
|
607 | else |
|
|
608 | { |
|
|
609 | slog (L_ERR, |
|
|
610 | _("FATAL: unknown revents %08x in socket, terminating\n"), |
|
|
611 | revents); |
|
|
612 | exit (EXIT_FAILURE); |
360 | } |
613 | } |
361 | } |
614 | } |
362 | |
615 | |
363 | void |
616 | void |
364 | vpn::tap_ev (io_watcher &w, short revents) |
617 | vpn::tap_ev (io_watcher &w, short revents) |
365 | { |
618 | { |
366 | if (revents & POLLIN) |
619 | if (revents & EVENT_READ) |
367 | { |
620 | { |
368 | /* process data */ |
621 | /* process data */ |
369 | tap_packet *pkt; |
622 | tap_packet *pkt; |
370 | |
623 | |
371 | pkt = tap->recv (); |
624 | pkt = tap->recv (); |
372 | |
625 | |
|
|
626 | if (!pkt) |
|
|
627 | return; |
|
|
628 | |
|
|
629 | if (pkt->len > 14) |
|
|
630 | { |
373 | int dst = mac2id (pkt->dst); |
631 | int dst = mac2id (pkt->dst); |
374 | int src = mac2id (pkt->src); |
632 | int src = mac2id (pkt->src); |
375 | |
633 | |
376 | if (src != THISNODE->id) |
634 | if (src != THISNODE->id) |
377 | { |
|
|
378 | slog (L_ERR, _("FATAL: tap packet not originating on current node received, terminating.")); |
|
|
379 | exit (1); |
|
|
380 | } |
|
|
381 | |
|
|
382 | if (dst == THISNODE->id) |
|
|
383 | { |
|
|
384 | slog (L_ERR, _("FATAL: tap packet destined for current node received, terminating.")); |
|
|
385 | exit (1); |
|
|
386 | } |
|
|
387 | |
|
|
388 | if (dst > conns.size ()) |
|
|
389 | slog (L_ERR, _("tap packet for unknown node %d received, ignoring."), dst); |
|
|
390 | else |
|
|
391 | { |
|
|
392 | if (dst) |
|
|
393 | { |
635 | { |
394 | // unicast |
636 | slog (L_ERR, _("FATAL: tap packet not originating on current node received (if-up script not working properly?), exiting.")); |
395 | if (dst != THISNODE->id) |
637 | exit (EXIT_FAILURE); |
396 | conns[dst - 1]->inject_data_packet (pkt); |
|
|
397 | } |
638 | } |
|
|
639 | |
|
|
640 | if (dst == THISNODE->id) |
|
|
641 | { |
|
|
642 | slog (L_ERR, _("FATAL: tap packet destined for current node received, exiting.")); |
|
|
643 | exit (EXIT_FAILURE); |
|
|
644 | } |
|
|
645 | |
|
|
646 | if (dst > conns.size ()) |
|
|
647 | slog (L_ERR, _("tap packet for unknown node %d received, ignoring."), dst); |
398 | else |
648 | else |
399 | { |
|
|
400 | // broadcast, first check router, then self, then english |
|
|
401 | connection *router = find_router (); |
|
|
402 | |
|
|
403 | if (router) |
|
|
404 | router->inject_data_packet (pkt, true); |
649 | inject_data_packet (pkt, dst); |
405 | else |
|
|
406 | for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c) |
|
|
407 | if ((*c)->conf != THISNODE) |
|
|
408 | (*c)->inject_data_packet (pkt); |
|
|
409 | } |
|
|
410 | } |
650 | } |
411 | |
651 | |
412 | delete pkt; |
652 | delete pkt; |
413 | } |
|
|
414 | else if (revents & (POLLHUP | POLLERR)) |
|
|
415 | { |
|
|
416 | slog (L_ERR, _("FATAL: POLLHUP or POLLERR on network device fd, terminating.")); |
|
|
417 | exit (1); |
|
|
418 | } |
653 | } |
419 | else |
654 | else |
420 | abort (); |
655 | abort (); |
421 | } |
656 | } |
422 | |
657 | |
… | |
… | |
428 | if (events & EVENT_SHUTDOWN) |
663 | if (events & EVENT_SHUTDOWN) |
429 | { |
664 | { |
430 | slog (L_INFO, _("preparing shutdown...")); |
665 | slog (L_INFO, _("preparing shutdown...")); |
431 | |
666 | |
432 | shutdown_all (); |
667 | shutdown_all (); |
433 | |
|
|
434 | remove_pid (pidfilename); |
668 | remove_pid (conf.pidfilename); |
435 | |
|
|
436 | slog (L_INFO, _("terminating")); |
669 | slog (L_INFO, _("terminating")); |
437 | |
670 | exit (EXIT_SUCCESS); |
438 | exit (0); |
|
|
439 | } |
671 | } |
440 | |
672 | |
441 | if (events & EVENT_RECONNECT) |
673 | if (events & EVENT_RECONNECT) |
442 | { |
674 | { |
443 | slog (L_INFO, _("forced reconnect")); |
675 | slog (L_INFO, _("forced reconnect")); |
… | |
… | |
445 | reconnect_all (); |
677 | reconnect_all (); |
446 | } |
678 | } |
447 | |
679 | |
448 | events = 0; |
680 | events = 0; |
449 | } |
681 | } |
450 | |
|
|
451 | w.at = TSTAMP_CANCEL; |
|
|
452 | } |
682 | } |
453 | |
683 | |
454 | void |
684 | void |
455 | vpn::shutdown_all () |
685 | vpn::shutdown_all () |
456 | { |
686 | { |
… | |
… | |
469 | connection_init (); |
699 | connection_init (); |
470 | |
700 | |
471 | for (configuration::node_vector::iterator i = conf.nodes.begin (); |
701 | for (configuration::node_vector::iterator i = conf.nodes.begin (); |
472 | i != conf.nodes.end (); ++i) |
702 | i != conf.nodes.end (); ++i) |
473 | { |
703 | { |
474 | connection *conn = new connection (this); |
704 | connection *conn = new connection (this, *i); |
475 | |
|
|
476 | conn->conf = *i; |
|
|
477 | conns.push_back (conn); |
705 | conns.push_back (conn); |
478 | |
|
|
479 | conn->establish_connection (); |
706 | conn->establish_connection (); |
480 | } |
707 | } |
481 | } |
708 | } |
482 | |
709 | |
483 | connection *vpn::find_router () |
710 | connection *vpn::find_router () |
484 | { |
711 | { |
485 | u32 prio = 0; |
712 | u32 prio = 1; |
486 | connection *router = 0; |
713 | connection *router = 0; |
487 | |
714 | |
488 | for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i) |
715 | for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i) |
489 | { |
716 | { |
490 | connection *c = *i; |
717 | connection *c = *i; |
491 | |
718 | |
492 | if (c->conf->routerprio > prio |
719 | if (c->conf->routerprio > prio |
493 | && c->connectmode == conf_node::C_ALWAYS |
720 | && c->connectmode == conf_node::C_ALWAYS // so we don't drop the connection if in use |
494 | && c->conf != THISNODE |
|
|
495 | && c->ictx && c->octx) |
721 | && c->ictx && c->octx |
|
|
722 | && c->conf != THISNODE) // redundant, since ictx==octx==0 always on thisnode |
496 | { |
723 | { |
497 | prio = c->conf->routerprio; |
724 | prio = c->conf->routerprio; |
498 | router = c; |
725 | router = c; |
499 | } |
726 | } |
500 | } |
727 | } |
… | |
… | |
509 | if (c) |
736 | if (c) |
510 | c->send_connect_request (id); |
737 | c->send_connect_request (id); |
511 | else |
738 | else |
512 | // no router found, aggressively connect to all routers |
739 | // no router found, aggressively connect to all routers |
513 | for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i) |
740 | for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i) |
514 | if ((*i)->conf->routerprio) |
741 | if ((*i)->conf->routerprio && (*i)->conf != THISNODE) |
515 | (*i)->establish_connection (); |
742 | (*i)->establish_connection (); |
516 | } |
743 | } |
517 | |
744 | |
518 | void |
745 | void |
519 | connection::dump_status () |
746 | connection::dump_status () |
… | |
… | |
537 | |
764 | |
538 | slog (L_NOTICE, _("END status dump")); |
765 | slog (L_NOTICE, _("END status dump")); |
539 | } |
766 | } |
540 | |
767 | |
541 | vpn::vpn (void) |
768 | vpn::vpn (void) |
542 | : event(this, &vpn::event_cb) |
769 | : event (this, &vpn::event_cb) |
543 | , udpv4_ev_watcher(this, &vpn::udpv4_ev) |
770 | , udpv4_ev_watcher (this, &vpn::udpv4_ev) |
544 | , ipv4_ev_watcher (this, &vpn::ipv4_ev) |
771 | , ipv4_ev_watcher (this, &vpn::ipv4_ev) |
545 | , tap_ev_watcher (this, &vpn::tap_ev) |
|
|
546 | #if ENABLE_TCP |
772 | #if ENABLE_TCP |
547 | , tcpv4_ev_watcher(this, &vpn::tcpv4_ev) |
773 | , tcpv4_ev_watcher (this, &vpn::tcpv4_ev) |
548 | #endif |
774 | #endif |
|
|
775 | #if ENABLE_ICMP |
|
|
776 | , icmpv4_ev_watcher(this, &vpn::icmpv4_ev) |
|
|
777 | #endif |
|
|
778 | #if ENABLE_DNS |
|
|
779 | , dnsv4_ev_watcher (this, &vpn::dnsv4_ev) |
|
|
780 | #endif |
|
|
781 | , tap_ev_watcher (this, &vpn::tap_ev) |
549 | { |
782 | { |
550 | } |
783 | } |
551 | |
784 | |
552 | vpn::~vpn () |
785 | vpn::~vpn () |
553 | { |
786 | { |