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) 2003-2007 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 (int) |
51 | static void inline |
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52 | set_tos (int fd, int &tos_prev, int tos) |
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53 | { |
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54 | #if defined(SOL_IP) && defined(IP_TOS) |
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55 | if (tos_prev == tos) |
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56 | return; |
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57 | |
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58 | tos_prev = tos; |
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59 | setsockopt (fd, SOL_IP, IP_TOS, &tos, sizeof tos); |
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60 | #endif |
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61 | } |
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62 | |
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63 | void |
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64 | vpn::script_init_env () |
46 | { |
65 | { |
47 | // the tunnel device mtu should be the physical mtu - overhead |
66 | // the tunnel device mtu should be the physical mtu - overhead |
48 | // the tricky part is rounding to the cipher key blocksize |
67 | // the tricky part is rounding to the cipher key blocksize |
49 | int mtu = conf.mtu - ETH_OVERHEAD - VPE_OVERHEAD - MAX_OVERHEAD; |
68 | int mtu = conf.mtu - ETH_OVERHEAD - VPE_OVERHEAD - MAX_OVERHEAD; |
50 | mtu += ETH_OVERHEAD - 6 - 6; // now we have the data portion |
69 | mtu += ETH_OVERHEAD - 6 - 6; // now we have the data portion |
51 | mtu -= mtu % EVP_CIPHER_block_size (CIPHER); // round |
70 | mtu -= mtu % EVP_CIPHER_block_size (CIPHER); // round |
52 | mtu -= ETH_OVERHEAD - 6 - 6; // and get interface mtu again |
71 | mtu -= ETH_OVERHEAD - 6 - 6; // and get interface mtu again |
53 | |
72 | |
54 | char *env; |
73 | char *env; |
55 | asprintf (&env, "CONFBASE=%s", confbase); |
74 | 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 ()); |
75 | asprintf (&env, "IFNAME=%s", tap->interface ()); putenv (env); |
62 | putenv (env); |
76 | asprintf (&env, "IFTYPE=%s", IFTYPE); putenv (env); |
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77 | asprintf (&env, "IFSUBTYPE=%s", IFSUBTYPE); putenv (env); |
63 | asprintf (&env, "MTU=%d", mtu); |
78 | asprintf (&env, "MTU=%d", mtu); putenv (env); |
64 | putenv (env); |
79 | asprintf (&env, "NODES=%d", conns.size ()); putenv (env); |
65 | asprintf (&env, "MAC=%02x:%02x:%02x:%02x:%02x:%02x", |
80 | 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 | |
81 | |
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82 | conns [THISNODE->id - 1]->script_init_env (""); |
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83 | |
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84 | for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c) |
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85 | { |
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86 | char ext[16]; |
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87 | snprintf (ext, 16, "_%d", (*c)->conf->id); |
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88 | (*c)->script_init_env (ext); |
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89 | } |
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90 | } |
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91 | |
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92 | inline const char * |
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93 | vpn::script_if_init () |
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94 | { |
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95 | script_init_env (); |
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96 | |
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97 | return tap->if_up (); |
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98 | } |
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99 | |
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100 | inline const char * |
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101 | vpn::script_if_up () |
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102 | { |
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103 | script_init_env (); |
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104 | |
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105 | char *filename; |
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106 | asprintf (&filename, |
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107 | "%s/%s", |
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108 | confbase, |
70 | return ::conf.script_if_up ? ::conf.script_if_up : "if-up"; |
109 | ::conf.script_if_up ? ::conf.script_if_up : "if-up"); |
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110 | |
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111 | return filename; |
71 | } |
112 | } |
72 | |
113 | |
73 | int |
114 | int |
74 | vpn::setup () |
115 | vpn::setup () |
75 | { |
116 | { |
76 | sockinfo si; |
117 | ipv4_tos = -1; |
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118 | ipv4_fd = -1; |
77 | |
119 | |
78 | si.set (THISNODE); |
120 | if (THISNODE->protocols & PROT_IPv4 && ::conf.ip_proto) |
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121 | { |
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122 | ipv4_fd = socket (PF_INET, SOCK_RAW, ::conf.ip_proto); |
79 | |
123 | |
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124 | if (ipv4_fd < 0) |
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125 | return -1; |
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126 | |
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127 | fcntl (ipv4_fd, F_SETFL, O_NONBLOCK); |
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128 | fcntl (ipv4_fd, F_SETFD, FD_CLOEXEC); |
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129 | |
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130 | #if defined(SOL_IP) && defined(IP_MTU_DISCOVER) |
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131 | // this I really consider a linux bug. I am neither connected |
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132 | // nor do I fragment myself. Linux still sets DF and doesn't |
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133 | // fragment for me sometimes. |
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134 | { |
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135 | int oval = IP_PMTUDISC_DONT; |
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136 | setsockopt (ipv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval); |
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137 | } |
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138 | #endif |
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139 | |
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140 | sockinfo si (THISNODE, PROT_IPv4); |
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141 | |
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142 | if (bind (ipv4_fd, si.sav4 (), si.salenv4 ())) |
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143 | { |
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144 | slog (L_ERR, _("can't bind ipv4 socket on %s: %s"), (const char *)si, strerror (errno)); |
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145 | exit (EXIT_FAILURE); |
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146 | } |
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147 | |
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148 | ipv4_ev_watcher.start (ipv4_fd, EV_READ); |
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149 | } |
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150 | |
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151 | udpv4_tos = -1; |
80 | udpv4_fd = -1; |
152 | udpv4_fd = -1; |
81 | |
153 | |
82 | if (THISNODE->protocols & PROT_UDPv4) |
154 | if (THISNODE->protocols & PROT_UDPv4 && THISNODE->udp_port) |
83 | { |
155 | { |
84 | udpv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP); |
156 | udpv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP); |
85 | |
157 | |
86 | if (udpv4_fd < 0) |
158 | if (udpv4_fd < 0) |
87 | return -1; |
159 | return -1; |
88 | |
160 | |
89 | if (bind (udpv4_fd, si.sav4 (), si.salenv4 ())) |
161 | fcntl (udpv4_fd, F_SETFL, O_NONBLOCK); |
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162 | fcntl (udpv4_fd, F_SETFD, FD_CLOEXEC); |
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163 | |
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164 | // standard daemon practise... |
90 | { |
165 | { |
91 | slog (L_ERR, _("can't bind udpv4 to %s: %s"), (const char *)si, strerror (errno)); |
166 | int oval = 1; |
92 | exit (1); |
167 | setsockopt (udpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval); |
93 | } |
168 | } |
94 | |
169 | |
95 | #ifdef IP_MTU_DISCOVER |
170 | #if defined(SOL_IP) && defined(IP_MTU_DISCOVER) |
96 | // this I really consider a linux bug. I am neither connected |
171 | // this I really consider a linux bug. I am neither connected |
97 | // nor do I fragment myself. Linux still sets DF and doesn't |
172 | // nor do I fragment myself. Linux still sets DF and doesn't |
98 | // fragment for me sometimes. |
173 | // fragment for me sometimes. |
99 | { |
174 | { |
100 | int oval = IP_PMTUDISC_DONT; |
175 | int oval = IP_PMTUDISC_DONT; |
101 | setsockopt (udpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval); |
176 | setsockopt (udpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval); |
102 | } |
177 | } |
103 | #endif |
178 | #endif |
104 | |
179 | |
105 | // standard daemon practise... |
180 | sockinfo si (THISNODE, PROT_UDPv4); |
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181 | |
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182 | if (bind (udpv4_fd, si.sav4 (), si.salenv4 ())) |
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183 | { |
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184 | slog (L_ERR, _("can't bind udpv4 on %s: %s"), (const char *)si, strerror (errno)); |
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185 | exit (EXIT_FAILURE); |
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186 | } |
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187 | |
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188 | udpv4_ev_watcher.start (udpv4_fd, EV_READ); |
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189 | } |
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190 | |
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191 | icmpv4_tos = -1; |
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192 | icmpv4_fd = -1; |
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193 | |
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194 | #if ENABLE_ICMP |
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195 | if (THISNODE->protocols & PROT_ICMPv4) |
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196 | { |
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197 | icmpv4_fd = socket (PF_INET, SOCK_RAW, IPPROTO_ICMP); |
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198 | |
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199 | if (icmpv4_fd < 0) |
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200 | return -1; |
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201 | |
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202 | fcntl (icmpv4_fd, F_SETFL, O_NONBLOCK); |
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203 | fcntl (icmpv4_fd, F_SETFD, FD_CLOEXEC); |
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204 | |
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205 | #ifdef ICMP_FILTER |
106 | { |
206 | { |
107 | int oval = 1; |
207 | icmp_filter oval; |
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208 | oval.data = 0xffffffff; |
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209 | if (::conf.icmp_type < 32) |
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210 | oval.data &= ~(1 << ::conf.icmp_type); |
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211 | |
108 | setsockopt (udpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval); |
212 | setsockopt (icmpv4_fd, SOL_RAW, ICMP_FILTER, &oval, sizeof oval); |
109 | } |
213 | } |
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214 | #endif |
110 | |
215 | |
111 | udpv4_ev_watcher.start (udpv4_fd, POLLIN); |
216 | #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 |
217 | // this I really consider a linux bug. I am neither connected |
130 | // nor do I fragment myself. Linux still sets DF and doesn't |
218 | // nor do I fragment myself. Linux still sets DF and doesn't |
131 | // fragment for me sometimes. |
219 | // fragment for me sometimes. |
132 | { |
220 | { |
133 | int oval = IP_PMTUDISC_DONT; |
221 | int oval = IP_PMTUDISC_DONT; |
134 | setsockopt (ipv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval); |
222 | setsockopt (icmpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval); |
135 | } |
223 | } |
136 | #endif |
224 | #endif |
137 | |
225 | |
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226 | sockinfo si (THISNODE, PROT_ICMPv4); |
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227 | |
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228 | if (bind (icmpv4_fd, si.sav4 (), si.salenv4 ())) |
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229 | { |
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230 | slog (L_ERR, _("can't bind icmpv4 on %s: %s"), (const char *)si, strerror (errno)); |
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231 | exit (EXIT_FAILURE); |
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232 | } |
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233 | |
138 | ipv4_ev_watcher.start (ipv4_fd, POLLIN); |
234 | icmpv4_ev_watcher.start (icmpv4_fd, EV_READ); |
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235 | } |
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236 | #endif |
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237 | |
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238 | tcpv4_fd = -1; |
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239 | |
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240 | #if ENABLE_TCP |
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241 | if (THISNODE->protocols & PROT_TCPv4 && THISNODE->tcp_port) |
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242 | { |
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243 | tcpv4_fd = socket (PF_INET, SOCK_STREAM, IPPROTO_TCP); |
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244 | |
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245 | if (tcpv4_fd < 0) |
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246 | return -1; |
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247 | |
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248 | fcntl (tcpv4_fd, F_SETFL, O_NONBLOCK); |
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249 | fcntl (tcpv4_fd, F_SETFD, FD_CLOEXEC); |
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250 | |
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251 | // standard daemon practise... |
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252 | { |
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253 | int oval = 1; |
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254 | setsockopt (tcpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval); |
139 | } |
255 | } |
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256 | |
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257 | sockinfo si (THISNODE, PROT_TCPv4); |
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258 | |
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259 | if (bind (tcpv4_fd, si.sav4 (), si.salenv4 ())) |
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260 | { |
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261 | slog (L_ERR, _("can't bind tcpv4 on %s: %s"), (const char *)si, strerror (errno)); |
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262 | exit (EXIT_FAILURE); |
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263 | } |
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264 | |
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265 | if (listen (tcpv4_fd, 5)) |
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266 | { |
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267 | slog (L_ERR, _("can't listen tcpv4 on %s: %s"), (const char *)si, strerror (errno)); |
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268 | exit (EXIT_FAILURE); |
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269 | } |
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270 | |
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271 | tcpv4_ev_watcher.start (tcpv4_fd, EV_READ); |
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272 | } |
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273 | #endif |
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274 | |
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275 | dnsv4_tos = -1; |
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276 | dnsv4_fd = -1; |
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277 | |
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278 | #if ENABLE_DNS |
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279 | if (THISNODE->protocols & PROT_DNSv4) |
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280 | { |
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281 | dns_forwarder.set (::conf.dns_forw_host, ::conf.dns_forw_port, PROT_DNSv4); |
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282 | |
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283 | dnsv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP); |
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284 | |
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285 | if (dnsv4_fd < 0) |
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286 | return -1; |
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287 | |
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288 | fcntl (dnsv4_fd, F_SETFL, O_NONBLOCK); |
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289 | fcntl (dnsv4_fd, F_SETFD, FD_CLOEXEC); |
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290 | |
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291 | # if defined(SOL_IP) && defined(IP_MTU_DISCOVER) |
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292 | // this I really consider a linux bug. I am neither connected |
|
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293 | // nor do I fragment myself. Linux still sets DF and doesn't |
|
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294 | // fragment for me sometimes. |
|
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295 | { |
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296 | int oval = IP_PMTUDISC_DONT; |
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297 | setsockopt (dnsv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval); |
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298 | } |
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299 | # endif |
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300 | |
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301 | // standard daemon practise... |
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302 | { |
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303 | int oval = 1; |
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304 | setsockopt (dnsv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval); |
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305 | } |
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306 | |
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307 | sockinfo si (THISNODE->dns_hostname, |
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308 | THISNODE->dns_hostname ? THISNODE->dns_port : 0, |
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309 | PROT_DNSv4); |
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310 | |
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311 | if (bind (dnsv4_fd, si.sav4 (), si.salenv4 ())) |
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312 | { |
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313 | slog (L_ERR, _("can't bind dnsv4 on %s: %s"), (const char *)si, strerror (errno)); |
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314 | exit (EXIT_FAILURE); |
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315 | } |
|
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316 | |
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317 | dnsv4_ev_watcher.start (dnsv4_fd, EV_READ); |
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318 | } |
|
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319 | #endif |
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320 | |
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321 | ///////////////////////////////////////////////////////////////////////////// |
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322 | |
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323 | reconnect_all (); |
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324 | |
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325 | ///////////////////////////////////////////////////////////////////////////// |
140 | |
326 | |
141 | tap = new tap_device (); |
327 | tap = new tap_device (); |
142 | if (!tap) //D this, of course, never catches |
328 | if (!tap) //D this, of course, never catches |
143 | { |
329 | { |
144 | slog (L_ERR, _("cannot create network interface '%s'"), conf.ifname); |
330 | slog (L_ERR, _("cannot create network interface '%s'"), conf.ifname); |
145 | exit (1); |
331 | exit (EXIT_FAILURE); |
146 | } |
332 | } |
147 | |
333 | |
148 | run_script (run_script_cb (this, &vpn::script_if_up), true); |
334 | fcntl (tap->fd, F_SETFD, FD_CLOEXEC); |
149 | |
335 | |
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336 | run_script_cb cb; |
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337 | cb.set<vpn, &vpn::script_if_init> (this); |
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338 | |
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339 | if (tap->if_up () && |
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340 | !run_script (cb, true)) |
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341 | { |
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342 | slog (L_ERR, _("interface initialization command '%s' failed, exiting."), |
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343 | tap->if_up ()); |
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344 | exit (EXIT_FAILURE); |
|
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345 | } |
|
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346 | |
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347 | cb.set<vpn, &vpn::script_if_up> (this); |
|
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348 | if (!run_script (cb, true)) |
|
|
349 | { |
|
|
350 | slog (L_ERR, _("if-up command execution failed, exiting.")); |
|
|
351 | exit (EXIT_FAILURE); |
|
|
352 | } |
|
|
353 | |
150 | tap_ev_watcher.start (tap->fd, POLLIN); |
354 | tap_ev_watcher.start (tap->fd, EV_READ); |
151 | |
|
|
152 | reconnect_all (); |
|
|
153 | |
355 | |
154 | return 0; |
356 | return 0; |
155 | } |
357 | } |
156 | |
358 | |
|
|
359 | bool |
|
|
360 | vpn::send_ipv4_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
|
|
361 | { |
|
|
362 | set_tos (ipv4_fd, ipv4_tos, tos); |
|
|
363 | sendto (ipv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ()); |
|
|
364 | |
|
|
365 | return true; |
|
|
366 | } |
|
|
367 | |
|
|
368 | static u16 |
|
|
369 | ipv4_checksum (u16 *data, unsigned int len) |
|
|
370 | { |
|
|
371 | // use 32 bit accumulator and fold back carry bits at the end |
|
|
372 | u32 sum = 0; |
|
|
373 | |
|
|
374 | while (len > 1) |
|
|
375 | { |
|
|
376 | sum += *data++; |
|
|
377 | len -= 2; |
|
|
378 | } |
|
|
379 | |
|
|
380 | // odd byte left? |
|
|
381 | if (len) |
|
|
382 | sum += *(u8 *)data; |
|
|
383 | |
|
|
384 | // add back carry bits |
|
|
385 | sum = (sum >> 16) + (sum & 0xffff); // lo += hi |
|
|
386 | sum += (sum >> 16); // carry |
|
|
387 | |
|
|
388 | return ~sum; |
|
|
389 | } |
|
|
390 | |
|
|
391 | #if ENABLE_ICMP |
|
|
392 | bool |
|
|
393 | vpn::send_icmpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
|
|
394 | { |
|
|
395 | pkt->unshift_hdr (4); |
|
|
396 | |
|
|
397 | icmp_header *hdr = (icmp_header *)&((*pkt)[0]); |
|
|
398 | hdr->type = ::conf.icmp_type; |
|
|
399 | hdr->code = 255; |
|
|
400 | hdr->checksum = 0; |
|
|
401 | hdr->checksum = ipv4_checksum ((u16 *)hdr, pkt->len); |
|
|
402 | |
|
|
403 | set_tos (icmpv4_fd, icmpv4_tos, tos); |
|
|
404 | sendto (icmpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ()); |
|
|
405 | |
|
|
406 | return true; |
|
|
407 | } |
|
|
408 | #endif |
|
|
409 | |
|
|
410 | bool |
|
|
411 | vpn::send_udpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
|
|
412 | { |
|
|
413 | set_tos (udpv4_fd, udpv4_tos, tos); |
|
|
414 | sendto (udpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ()); |
|
|
415 | |
|
|
416 | return true; |
|
|
417 | } |
|
|
418 | |
157 | void |
419 | void |
158 | vpn::send_ipv4_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
420 | vpn::inject_data_packet (tap_packet *pkt, int dst) |
159 | { |
421 | { |
160 | setsockopt (ipv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos); |
422 | if (dst) |
161 | sendto (ipv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ()); |
423 | { |
162 | } |
424 | // unicast |
163 | |
425 | if (dst != THISNODE->id) |
164 | void |
426 | conns[dst - 1]->inject_data_packet (pkt); |
165 | vpn::send_udpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
427 | } |
166 | { |
428 | else |
167 | setsockopt (udpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos); |
429 | { |
168 | sendto (udpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ()); |
430 | // broadcast, this is ugly, but due to the security policy |
|
|
431 | // we have to connect to all hosts... |
|
|
432 | for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c) |
|
|
433 | if ((*c)->conf != THISNODE) |
|
|
434 | (*c)->inject_data_packet (pkt); |
|
|
435 | } |
169 | } |
436 | } |
170 | |
437 | |
171 | void |
438 | void |
172 | vpn::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi) |
439 | vpn::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi) |
173 | { |
440 | { |
… | |
… | |
180 | if (src == 0 || src > conns.size () |
447 | if (src == 0 || src > conns.size () |
181 | || dst > conns.size () |
448 | || dst > conns.size () |
182 | || pkt->typ () >= vpn_packet::PT_MAX) |
449 | || pkt->typ () >= vpn_packet::PT_MAX) |
183 | slog (L_WARN, _("(%s): received corrupted packet type %d (src %d, dst %d)"), |
450 | slog (L_WARN, _("(%s): received corrupted packet type %d (src %d, dst %d)"), |
184 | (const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ()); |
451 | (const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ()); |
|
|
452 | else if (dst > conns.size ()) |
|
|
453 | slog (L_WARN, _("(%s): received corrupted packet type %d (src %d, dst %d)"), |
|
|
454 | (const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ()); |
185 | else |
455 | else |
186 | { |
456 | { |
187 | connection *c = conns[src - 1]; |
457 | connection *c = conns[src - 1]; |
188 | |
458 | |
189 | if (dst == 0 && !THISNODE->routerprio) |
459 | if (dst == 0) |
190 | slog (L_WARN, _("%s(%s): received broadcast, but we are no router"), |
460 | slog (L_WARN, _("%s(%s): received broadcast (protocol violation)"), |
191 | c->conf->nodename, (const char *)rsi); |
461 | c->conf->nodename, (const char *)rsi); |
192 | else if (dst != 0 && dst != THISNODE->id) |
462 | else if (dst != THISNODE->id) |
193 | // FORWARDING NEEDED ;) |
463 | { |
|
|
464 | if (THISNODE->routerprio) |
|
|
465 | // the tos setting gets lost here. who cares. |
|
|
466 | conns[dst - 1]->inject_vpn_packet (pkt); |
|
|
467 | else |
194 | slog (L_WARN, |
468 | slog (L_WARN, |
195 | _("received frame for node %d ('%s') from %s, but this is node %d ('%s')"), |
469 | _("%s(%s): forwarding request (=> %s), but we are no router"), |
|
|
470 | c->conf->nodename, (const char *)rsi, |
196 | dst, conns[dst - 1]->conf->nodename, |
471 | conns[dst - 1]->conf->nodename); |
197 | (const char *)rsi, |
472 | } |
198 | THISNODE->id, THISNODE->nodename); |
|
|
199 | else |
473 | else |
200 | c->recv_vpn_packet (pkt, rsi); |
474 | c->recv_vpn_packet (pkt, rsi); |
201 | } |
475 | } |
202 | } |
476 | } |
203 | |
477 | |
204 | void |
478 | bool |
205 | vpn::udpv4_ev (short revents) |
479 | vpn::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
206 | { |
480 | { |
207 | if (revents & (POLLIN | POLLERR)) |
481 | switch (si.prot) |
|
|
482 | { |
|
|
483 | case PROT_IPv4: |
|
|
484 | return send_ipv4_packet (pkt, si, tos); |
|
|
485 | |
|
|
486 | case PROT_UDPv4: |
|
|
487 | return send_udpv4_packet (pkt, si, tos); |
|
|
488 | |
|
|
489 | #if ENABLE_TCP |
|
|
490 | case PROT_TCPv4: |
|
|
491 | return send_tcpv4_packet (pkt, si, tos); |
|
|
492 | #endif |
|
|
493 | #if ENABLE_ICMP |
|
|
494 | case PROT_ICMPv4: |
|
|
495 | return send_icmpv4_packet (pkt, si, tos); |
|
|
496 | #endif |
|
|
497 | #if ENABLE_DNS |
|
|
498 | case PROT_DNSv4: |
|
|
499 | return send_dnsv4_packet (pkt, si, tos); |
|
|
500 | #endif |
|
|
501 | default: |
|
|
502 | slog (L_CRIT, _("%s: FATAL: trying to send packet with unsupported protocol"), (const char *)si); |
|
|
503 | } |
|
|
504 | |
|
|
505 | return false; |
|
|
506 | } |
|
|
507 | |
|
|
508 | inline void |
|
|
509 | vpn::ipv4_ev (ev::io &w, int revents) |
|
|
510 | { |
|
|
511 | if (revents & EV_READ) |
208 | { |
512 | { |
209 | vpn_packet *pkt = new vpn_packet; |
513 | vpn_packet *pkt = new vpn_packet; |
210 | struct sockaddr_in sa; |
514 | struct sockaddr_in sa; |
211 | socklen_t sa_len = sizeof (sa); |
515 | socklen_t sa_len = sizeof (sa); |
212 | int len; |
516 | int len; |
213 | |
517 | |
214 | len = recvfrom (udpv4_fd, &((*pkt)[0]), MAXSIZE, 0, (sockaddr *)&sa, &sa_len); |
518 | len = recvfrom (w.fd, &((*pkt)[0]), MAXSIZE, 0, (sockaddr *)&sa, &sa_len); |
215 | |
519 | |
216 | sockinfo si(sa); |
520 | sockinfo si(sa, PROT_IPv4); |
217 | |
521 | |
218 | if (len > 0) |
522 | if (len > 0) |
219 | { |
523 | { |
220 | pkt->len = len; |
524 | pkt->len = len; |
|
|
525 | |
|
|
526 | // raw sockets deliver the ipv4 header, but don't expect it on sends |
|
|
527 | pkt->skip_hdr (IP_OVERHEAD); |
221 | |
528 | |
222 | recv_vpn_packet (pkt, si); |
529 | recv_vpn_packet (pkt, si); |
223 | } |
530 | } |
224 | else |
531 | else |
225 | { |
532 | { |
… | |
… | |
227 | slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno)); |
534 | slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno)); |
228 | } |
535 | } |
229 | |
536 | |
230 | delete pkt; |
537 | delete pkt; |
231 | } |
538 | } |
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 |
539 | else |
239 | { |
540 | { |
240 | slog (L_ERR, |
541 | slog (L_ERR, |
241 | _("FATAL: unknown revents %08x in socket, terminating\n"), |
542 | _("FATAL: unknown revents %08x in socket, terminating\n"), |
242 | revents); |
543 | revents); |
243 | exit (1); |
544 | exit (EXIT_FAILURE); |
244 | } |
545 | } |
245 | } |
546 | } |
246 | |
547 | |
247 | void |
548 | #if ENABLE_ICMP |
248 | vpn::ipv4_ev (short revents) |
549 | inline void |
|
|
550 | vpn::icmpv4_ev (ev::io &w, int revents) |
249 | { |
551 | { |
250 | if (revents & (POLLIN | POLLERR)) |
552 | if (revents & EV_READ) |
251 | { |
553 | { |
252 | vpn_packet *pkt = new vpn_packet; |
554 | vpn_packet *pkt = new vpn_packet; |
253 | struct sockaddr_in sa; |
555 | struct sockaddr_in sa; |
254 | socklen_t sa_len = sizeof (sa); |
556 | socklen_t sa_len = sizeof (sa); |
255 | int len; |
557 | int len; |
256 | |
558 | |
257 | len = recvfrom (ipv4_fd, &((*pkt)[0]), MAXSIZE, 0, (sockaddr *)&sa, &sa_len); |
559 | len = recvfrom (w.fd, &((*pkt)[0]), MAXSIZE, 0, (sockaddr *)&sa, &sa_len); |
258 | |
560 | |
259 | sockinfo si(sa, PROT_IPv4); |
561 | sockinfo si(sa, PROT_ICMPv4); |
260 | |
562 | |
261 | if (len > 0) |
563 | if (len > 0) |
262 | { |
564 | { |
263 | pkt->len = len; |
565 | pkt->len = len; |
264 | |
566 | |
|
|
567 | icmp_header *hdr = (icmp_header *)&((*pkt)[IP_OVERHEAD]); |
|
|
568 | |
|
|
569 | if (hdr->type == ::conf.icmp_type |
|
|
570 | && hdr->code == 255) |
|
|
571 | { |
265 | // raw sockets deliver the ipv4, but don't expect it on sends |
572 | // raw sockets deliver the ipv4, but don't expect it on sends |
266 | // this is slow, but... |
573 | // this is slow, but... |
267 | pkt->skip_hdr (IP_OVERHEAD); |
574 | pkt->skip_hdr (ICMP_OVERHEAD); |
268 | |
575 | |
269 | recv_vpn_packet (pkt, si); |
576 | recv_vpn_packet (pkt, si); |
|
|
577 | } |
270 | } |
578 | } |
271 | else |
579 | else |
272 | { |
580 | { |
273 | // probably ECONNRESET or somesuch |
581 | // probably ECONNRESET or somesuch |
274 | slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno)); |
582 | slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno)); |
275 | } |
583 | } |
276 | |
584 | |
277 | delete pkt; |
585 | 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 | } |
586 | } |
285 | else |
587 | else |
286 | { |
588 | { |
287 | slog (L_ERR, |
589 | slog (L_ERR, |
288 | _("FATAL: unknown revents %08x in socket, terminating\n"), |
590 | _("FATAL: unknown revents %08x in socket, terminating\n"), |
289 | revents); |
591 | revents); |
290 | exit (1); |
592 | exit (EXIT_FAILURE); |
|
|
593 | } |
|
|
594 | } |
|
|
595 | #endif |
|
|
596 | |
|
|
597 | inline void |
|
|
598 | vpn::udpv4_ev (ev::io &w, int revents) |
|
|
599 | { |
|
|
600 | if (revents & EV_READ) |
291 | } |
601 | { |
292 | } |
602 | vpn_packet *pkt = new vpn_packet; |
|
|
603 | struct sockaddr_in sa; |
|
|
604 | socklen_t sa_len = sizeof (sa); |
|
|
605 | int len; |
293 | |
606 | |
294 | void |
607 | len = recvfrom (w.fd, &((*pkt)[0]), MAXSIZE, 0, (sockaddr *)&sa, &sa_len); |
|
|
608 | |
|
|
609 | sockinfo si(sa, PROT_UDPv4); |
|
|
610 | |
|
|
611 | if (len > 0) |
|
|
612 | { |
|
|
613 | pkt->len = len; |
|
|
614 | |
|
|
615 | recv_vpn_packet (pkt, si); |
|
|
616 | } |
|
|
617 | else |
|
|
618 | { |
|
|
619 | // probably ECONNRESET or somesuch |
|
|
620 | slog (L_DEBUG, _("%s: fd %d, %s"), (const char *)si, w.fd, strerror (errno)); |
|
|
621 | } |
|
|
622 | |
|
|
623 | delete pkt; |
|
|
624 | } |
|
|
625 | else |
|
|
626 | { |
|
|
627 | slog (L_ERR, |
|
|
628 | _("FATAL: unknown revents %08x in socket, terminating\n"), |
|
|
629 | revents); |
|
|
630 | exit (EXIT_FAILURE); |
|
|
631 | } |
|
|
632 | } |
|
|
633 | |
|
|
634 | inline void |
295 | vpn::tap_ev (short revents) |
635 | vpn::tap_ev (ev::io &w, int revents) |
296 | { |
636 | { |
297 | if (revents & POLLIN) |
637 | if (revents & EV_READ) |
298 | { |
638 | { |
299 | /* process data */ |
639 | /* process data */ |
300 | tap_packet *pkt; |
640 | tap_packet *pkt; |
301 | |
641 | |
302 | pkt = tap->recv (); |
642 | pkt = tap->recv (); |
303 | |
643 | |
|
|
644 | if (!pkt) |
|
|
645 | return; |
|
|
646 | |
|
|
647 | if (pkt->len > 14) |
|
|
648 | { |
304 | int dst = mac2id (pkt->dst); |
649 | int dst = mac2id (pkt->dst); |
305 | int src = mac2id (pkt->src); |
650 | int src = mac2id (pkt->src); |
306 | |
651 | |
307 | if (src != THISNODE->id) |
652 | 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 | { |
653 | { |
325 | // unicast |
654 | slog (L_ERR, _("FATAL: tap packet not originating on current node received (if-up script not working properly?), exiting.")); |
326 | if (dst != THISNODE->id) |
655 | exit (EXIT_FAILURE); |
327 | conns[dst - 1]->inject_data_packet (pkt); |
|
|
328 | } |
656 | } |
|
|
657 | |
|
|
658 | if (dst == THISNODE->id) |
|
|
659 | { |
|
|
660 | slog (L_ERR, _("FATAL: tap packet destined for current node received, exiting.")); |
|
|
661 | exit (EXIT_FAILURE); |
|
|
662 | } |
|
|
663 | |
|
|
664 | if (dst > conns.size ()) |
|
|
665 | slog (L_ERR, _("tap packet for unknown node %d received, ignoring."), dst); |
329 | else |
666 | 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); |
667 | 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 | } |
668 | } |
342 | |
669 | |
343 | delete pkt; |
670 | 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 | } |
671 | } |
350 | else |
672 | else |
351 | abort (); |
673 | abort (); |
352 | } |
674 | } |
353 | |
675 | |
354 | void |
676 | inline void |
355 | vpn::event_cb (tstamp &ts) |
677 | vpn::event_cb (ev::timer &w, int) |
356 | { |
678 | { |
357 | if (events) |
679 | if (events) |
358 | { |
680 | { |
359 | if (events & EVENT_SHUTDOWN) |
681 | if (events & EVENT_SHUTDOWN) |
360 | { |
682 | { |
361 | slog (L_INFO, _("preparing shutdown...")); |
683 | slog (L_INFO, _("preparing shutdown...")); |
362 | |
684 | |
363 | shutdown_all (); |
685 | shutdown_all (); |
364 | |
|
|
365 | remove_pid (pidfilename); |
686 | remove_pid (conf.pidfilename); |
366 | |
|
|
367 | slog (L_INFO, _("terminating")); |
687 | slog (L_INFO, _("terminating")); |
368 | |
688 | exit (EXIT_SUCCESS); |
369 | exit (0); |
|
|
370 | } |
689 | } |
371 | |
690 | |
372 | if (events & EVENT_RECONNECT) |
691 | if (events & EVENT_RECONNECT) |
373 | { |
692 | { |
374 | slog (L_INFO, _("forced reconnect")); |
693 | slog (L_INFO, _("forced reconnect")); |
… | |
… | |
376 | reconnect_all (); |
695 | reconnect_all (); |
377 | } |
696 | } |
378 | |
697 | |
379 | events = 0; |
698 | events = 0; |
380 | } |
699 | } |
381 | |
|
|
382 | ts = TSTAMP_CANCEL; |
|
|
383 | } |
700 | } |
384 | |
701 | |
385 | void |
702 | void |
386 | vpn::shutdown_all () |
703 | vpn::shutdown_all () |
387 | { |
704 | { |
… | |
… | |
400 | connection_init (); |
717 | connection_init (); |
401 | |
718 | |
402 | for (configuration::node_vector::iterator i = conf.nodes.begin (); |
719 | for (configuration::node_vector::iterator i = conf.nodes.begin (); |
403 | i != conf.nodes.end (); ++i) |
720 | i != conf.nodes.end (); ++i) |
404 | { |
721 | { |
405 | connection *conn = new connection (this); |
722 | connection *conn = new connection (this, *i); |
406 | |
|
|
407 | conn->conf = *i; |
|
|
408 | conns.push_back (conn); |
723 | conns.push_back (conn); |
409 | |
|
|
410 | conn->establish_connection (); |
724 | conn->establish_connection (); |
411 | } |
725 | } |
412 | } |
726 | } |
413 | |
727 | |
414 | connection *vpn::find_router () |
728 | connection *vpn::find_router () |
415 | { |
729 | { |
416 | u32 prio = 0; |
730 | u32 prio = 1; |
417 | connection *router = 0; |
731 | connection *router = 0; |
418 | |
732 | |
419 | for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i) |
733 | for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i) |
420 | { |
734 | { |
421 | connection *c = *i; |
735 | connection *c = *i; |
422 | |
736 | |
423 | if (c->conf->routerprio > prio |
737 | if (c->conf->routerprio > prio |
424 | && c->connectmode == conf_node::C_ALWAYS |
738 | && 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) |
739 | && c->ictx && c->octx |
|
|
740 | && c->conf != THISNODE) // redundant, since ictx==octx==0 always on thisnode |
427 | { |
741 | { |
428 | prio = c->conf->routerprio; |
742 | prio = c->conf->routerprio; |
429 | router = c; |
743 | router = c; |
430 | } |
744 | } |
431 | } |
745 | } |
432 | |
746 | |
433 | return router; |
747 | return router; |
434 | } |
748 | } |
435 | |
749 | |
436 | void vpn::connect_request (int id) |
750 | void vpn::send_connect_request (int id) |
437 | { |
751 | { |
438 | connection *c = find_router (); |
752 | connection *c = find_router (); |
439 | |
753 | |
440 | if (c) |
754 | if (c) |
441 | c->connect_request (id); |
755 | c->send_connect_request (id); |
442 | //else // does not work, because all others must connect to the same router |
756 | else |
443 | // // no router found, aggressively connect to all routers |
757 | // no router found, aggressively connect to all routers |
444 | // for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i) |
758 | for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i) |
445 | // if ((*i)->conf->routerprio) |
759 | if ((*i)->conf->routerprio && (*i)->conf != THISNODE) |
446 | // (*i)->establish_connection (); |
760 | (*i)->establish_connection (); |
447 | } |
761 | } |
448 | |
762 | |
449 | void |
763 | void |
450 | connection::dump_status () |
764 | connection::dump_status () |
451 | { |
765 | { |
… | |
… | |
459 | } |
773 | } |
460 | |
774 | |
461 | void |
775 | void |
462 | vpn::dump_status () |
776 | vpn::dump_status () |
463 | { |
777 | { |
464 | slog (L_NOTICE, _("BEGIN status dump (%ld)"), (long)NOW); |
778 | slog (L_NOTICE, _("BEGIN status dump (%ld)"), (long)ev_now ()); |
465 | |
779 | |
466 | for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c) |
780 | for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c) |
467 | (*c)->dump_status (); |
781 | (*c)->dump_status (); |
468 | |
782 | |
469 | slog (L_NOTICE, _("END status dump")); |
783 | slog (L_NOTICE, _("END status dump")); |
470 | } |
784 | } |
471 | |
785 | |
472 | vpn::vpn (void) |
786 | vpn::vpn (void) |
|
|
787 | { |
|
|
788 | event .set<vpn, &vpn::event_cb > (this); |
473 | : udpv4_ev_watcher(this, &vpn::udpv4_ev) |
789 | udpv4_ev_watcher .set<vpn, &vpn::udpv4_ev > (this); |
474 | , ipv4_ev_watcher(this, &vpn::ipv4_ev) |
790 | ipv4_ev_watcher .set<vpn, &vpn::ipv4_ev > (this); |
475 | , tap_ev_watcher(this, &vpn::tap_ev) |
791 | #if ENABLE_TCP |
476 | , event(this, &vpn::event_cb) |
792 | tcpv4_ev_watcher .set<vpn, &vpn::tcpv4_ev > (this); |
477 | { |
793 | #endif |
|
|
794 | #if ENABLE_ICMP |
|
|
795 | icmpv4_ev_watcher.set<vpn, &vpn::icmpv4_ev> (this); |
|
|
796 | #endif |
|
|
797 | #if ENABLE_DNS |
|
|
798 | dnsv4_ev_watcher .set<vpn, &vpn::dnsv4_ev > (this); |
|
|
799 | #endif |
|
|
800 | tap_ev_watcher .set<vpn, &vpn::tap_ev > (this); |
478 | } |
801 | } |
479 | |
802 | |
480 | vpn::~vpn () |
803 | vpn::~vpn () |
481 | { |
804 | { |
482 | } |
805 | } |