1 | /* |
1 | /* |
2 | vpn.C -- handle the protocol, encryption, handshaking etc. |
2 | vpn.C -- handle the protocol, encryption, handshaking etc. |
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3 | Copyright (C) 2003-2008,2010,2011 Marc Lehmann <gvpe@schmorp.de> |
3 | |
4 | |
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5 | This file is part of GVPE. |
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6 | |
4 | This program is free software; you can redistribute it and/or modify |
7 | GVPE is free software; you can redistribute it and/or modify it |
5 | it under the terms of the GNU General Public License as published by |
8 | under the terms of the GNU General Public License as published by the |
6 | the Free Software Foundation; either version 2 of the License, or |
9 | Free Software Foundation; either version 3 of the License, or (at your |
7 | (at your option) any later version. |
10 | option) any later version. |
8 | |
11 | |
9 | This program is distributed in the hope that it will be useful, |
12 | This program is distributed in the hope that it will be useful, but |
10 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
13 | WITHOUT ANY WARRANTY; without even the implied warranty of |
11 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General |
12 | GNU General Public License for more details. |
15 | Public License for more details. |
13 | |
16 | |
14 | You should have received a copy of the GNU General Public License |
17 | You should have received a copy of the GNU General Public License along |
15 | along with this program; if not, write to the Free Software |
18 | with this program; if not, see <http://www.gnu.org/licenses/>. |
16 | Foundation, Inc. 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
19 | |
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20 | Additional permission under GNU GPL version 3 section 7 |
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21 | |
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22 | If you modify this Program, or any covered work, by linking or |
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23 | combining it with the OpenSSL project's OpenSSL library (or a modified |
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24 | version of that library), containing parts covered by the terms of the |
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25 | OpenSSL or SSLeay licenses, the licensors of this Program grant you |
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26 | additional permission to convey the resulting work. Corresponding |
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27 | Source for a non-source form of such a combination shall include the |
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28 | source code for the parts of OpenSSL used as well as that of the |
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29 | covered work. |
17 | */ |
30 | */ |
18 | |
31 | |
19 | #include "config.h" |
32 | #include "config.h" |
20 | |
33 | |
21 | #include <list> |
34 | #include <list> |
22 | |
35 | |
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36 | #include <cstdio> |
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37 | #include <cstring> |
23 | #include <cstdlib> |
38 | #include <cstdlib> |
24 | #include <cstring> |
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25 | #include <cstdio> |
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26 | |
39 | |
27 | #include <sys/types.h> |
40 | #include <sys/types.h> |
28 | #include <sys/socket.h> |
41 | #include <sys/socket.h> |
29 | #include <sys/poll.h> |
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30 | #include <sys/wait.h> |
42 | #include <sys/wait.h> |
31 | #include <errno.h> |
43 | #include <errno.h> |
32 | #include <time.h> |
44 | #include <time.h> |
33 | #include <unistd.h> |
45 | #include <unistd.h> |
34 | #include <fcntl.h> |
46 | #include <fcntl.h> |
… | |
… | |
40 | |
52 | |
41 | #include "connection.h" |
53 | #include "connection.h" |
42 | #include "util.h" |
54 | #include "util.h" |
43 | #include "vpn.h" |
55 | #include "vpn.h" |
44 | |
56 | |
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57 | vpn network; // THE vpn (bad design...) |
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58 | |
45 | ///////////////////////////////////////////////////////////////////////////// |
59 | ///////////////////////////////////////////////////////////////////////////// |
46 | |
60 | |
47 | const char *vpn::script_if_up () |
61 | static void inline |
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62 | set_tos (int fd, int &tos_prev, int tos) |
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63 | { |
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64 | #if defined(SOL_IP) && defined(IP_TOS) |
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65 | if (tos_prev == tos) |
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66 | return; |
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67 | |
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68 | tos_prev = tos; |
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69 | setsockopt (fd, SOL_IP, IP_TOS, &tos, sizeof tos); |
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70 | #endif |
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71 | } |
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72 | |
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73 | void |
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74 | vpn::script_init_env () |
48 | { |
75 | { |
49 | // the tunnel device mtu should be the physical mtu - overhead |
76 | // the tunnel device mtu should be the physical mtu - overhead |
50 | // the tricky part is rounding to the cipher key blocksize |
77 | // the tricky part is rounding to the cipher key blocksize |
51 | int mtu = conf.mtu - ETH_OVERHEAD - VPE_OVERHEAD - MAX_OVERHEAD; |
78 | int mtu = conf.mtu - ETH_OVERHEAD - VPE_OVERHEAD - MAX_OVERHEAD; |
52 | mtu += ETH_OVERHEAD - 6 - 6; // now we have the data portion |
79 | mtu += ETH_OVERHEAD - 6 - 6; // now we have the data portion |
53 | mtu -= mtu % EVP_CIPHER_block_size (CIPHER); // round |
80 | mtu -= mtu % EVP_CIPHER_block_size (CIPHER); // round |
54 | mtu -= ETH_OVERHEAD - 6 - 6; // and get interface mtu again |
81 | mtu -= ETH_OVERHEAD - 6 - 6; // and get interface mtu again |
55 | |
82 | |
56 | char *env; |
83 | char *env; |
57 | asprintf (&env, "CONFBASE=%s", confbase); |
84 | asprintf (&env, "CONFBASE=%s", confbase); putenv (env); |
58 | putenv (env); |
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59 | asprintf (&env, "NODENAME=%s", THISNODE->nodename); |
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60 | putenv (env); |
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61 | asprintf (&env, "NODEID=%d", THISNODE->id); |
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62 | putenv (env); |
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63 | asprintf (&env, "IFNAME=%s", tap->interface ()); |
85 | asprintf (&env, "IFNAME=%s", tap->interface ()); putenv (env); |
64 | putenv (env); |
86 | asprintf (&env, "IFTYPE=%s", IFTYPE); putenv (env); |
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87 | asprintf (&env, "IFSUBTYPE=%s", IFSUBTYPE); putenv (env); |
65 | asprintf (&env, "MTU=%d", mtu); |
88 | asprintf (&env, "MTU=%d", mtu); putenv (env); |
66 | putenv (env); |
89 | asprintf (&env, "NODES=%d", conns.size ()); putenv (env); |
67 | asprintf (&env, "MAC=%02x:%02x:%02x:%02x:%02x:%02x", |
90 | asprintf (&env, "NODEID=%d", THISNODE->id); putenv (env); |
68 | 0xfe, 0xfd, 0x80, 0x00, THISNODE->id >> 8, |
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69 | THISNODE->id & 0xff); |
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70 | putenv (env); |
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71 | |
91 | |
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92 | conns [THISNODE->id - 1]->script_init_env (""); |
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93 | |
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94 | for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c) |
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95 | { |
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96 | char ext[16]; |
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97 | snprintf (ext, 16, "_%d", (*c)->conf->id); |
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98 | (*c)->script_init_env (ext); |
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99 | } |
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100 | } |
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101 | |
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102 | inline const char * |
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103 | vpn::script_if_init () |
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104 | { |
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105 | script_init_env (); |
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106 | |
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107 | return tap->if_up (); |
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108 | } |
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109 | |
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110 | inline const char * |
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111 | vpn::script_if_up () |
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112 | { |
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113 | script_init_env (); |
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114 | |
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115 | char *filename; |
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116 | asprintf (&filename, |
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117 | "%s/%s", |
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118 | confbase, |
72 | return ::conf.script_if_up ? ::conf.script_if_up : "if-up"; |
119 | ::conf.script_if_up ? ::conf.script_if_up : "if-up"); |
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120 | |
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121 | return filename; |
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122 | } |
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123 | |
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124 | int |
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125 | vpn::setup_socket (u8 prot, int family, int type, int proto) |
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126 | { |
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127 | int fd = socket (family, type, proto); |
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128 | |
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129 | if (fd < 0) |
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130 | { |
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131 | slog (L_ERR, _("unable to create %s socket: %s."), strprotocol (prot), strerror (errno)); |
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132 | return fd; |
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133 | } |
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134 | |
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135 | fcntl (fd, F_SETFL, O_NONBLOCK); |
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136 | fcntl (fd, F_SETFD, FD_CLOEXEC); |
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137 | |
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138 | #ifdef SO_MARK |
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139 | if (::conf.nfmark) |
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140 | if (setsockopt (fd, SOL_SOCKET, SO_MARK, &::conf.nfmark, sizeof ::conf.nfmark)) |
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141 | slog (L_WARN, _("unable to set nfmark on %s socket: %s"), strprotocol (prot), strerror (errno)); |
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142 | #endif |
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143 | |
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144 | return fd; |
73 | } |
145 | } |
74 | |
146 | |
75 | int |
147 | int |
76 | vpn::setup () |
148 | vpn::setup () |
77 | { |
149 | { |
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150 | int success = 0; |
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151 | |
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152 | #if 1//D2 |
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153 | ipv42_tos = -1; |
78 | ipv4_fd = -1; |
154 | ipv42_fd = -1; |
79 | |
155 | |
80 | if (THISNODE->protocols & PROT_IPv4 && ::conf.ip_proto) |
156 | if (THISNODE->protocols & PROT_IPv42 && ::conf.ip_proto) |
81 | { |
157 | { |
82 | ipv4_fd = socket (PF_INET, SOCK_RAW, ::conf.ip_proto); |
158 | ipv42_fd = setup_socket (PROT_IPv42, PF_INET, SOCK_RAW, ::conf.ip2_proto); |
83 | |
159 | |
84 | if (ipv4_fd < 0) |
160 | if (ipv42_fd < 0) |
85 | return -1; |
161 | return -1; |
86 | |
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87 | fcntl (ipv4_fd, F_SETFL, O_NONBLOCK); |
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88 | |
162 | |
89 | #if defined(SOL_IP) && defined(IP_MTU_DISCOVER) |
163 | #if defined(SOL_IP) && defined(IP_MTU_DISCOVER) |
90 | // this I really consider a linux bug. I am neither connected |
164 | // this I really consider a linux bug. I am neither connected |
91 | // nor do I fragment myself. Linux still sets DF and doesn't |
165 | // nor do I fragment myself. Linux still sets DF and doesn't |
92 | // fragment for me sometimes. |
166 | // fragment for me sometimes. |
93 | { |
167 | { |
94 | int oval = IP_PMTUDISC_DONT; |
168 | int oval = IP_PMTUDISC_DONT; |
95 | setsockopt (ipv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval); |
169 | setsockopt (ipv42_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval); |
96 | } |
170 | } |
97 | #endif |
171 | #endif |
98 | |
172 | |
99 | sockinfo si (THISNODE, PROT_IPv4); |
173 | sockinfo si (THISNODE, PROT_IPv42); |
100 | |
174 | |
101 | if (bind (ipv4_fd, si.sav4 (), si.salenv4 ())) |
175 | if (bind (ipv42_fd, si.sav4 (), si.salenv4 ())) |
102 | { |
176 | { |
103 | slog (L_ERR, _("can't bind ipv4 socket on %s: %s"), (const char *)si, strerror (errno)); |
177 | slog (L_ERR, _("can't bind ipv42 socket on %s: %s, exiting."), (const char *)si, strerror (errno)); |
104 | exit (1); |
178 | return -1; |
105 | } |
179 | } |
106 | |
180 | |
107 | ipv4_ev_watcher.start (ipv4_fd, POLLIN); |
181 | ipv42_ev_watcher.start (ipv42_fd, EV_READ); |
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182 | ++success; |
108 | } |
183 | } |
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184 | else |
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185 | THISNODE->protocols &= ~PROT_IPv42; |
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186 | #endif |
109 | |
187 | |
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188 | ipv4_tos = -1; |
110 | udpv4_fd = -1; |
189 | ipv4_fd = -1; |
111 | |
190 | |
112 | if (THISNODE->protocols & PROT_UDPv4 && THISNODE->udp_port) |
191 | if (THISNODE->protocols & PROT_IPv4 && ::conf.ip_proto) |
113 | { |
192 | { |
114 | udpv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP); |
193 | ipv4_fd = setup_socket (PROT_IPv4, PF_INET, SOCK_RAW, ::conf.ip_proto); |
115 | |
194 | |
116 | if (udpv4_fd < 0) |
195 | if (ipv4_fd < 0) |
117 | return -1; |
196 | return -1; |
118 | |
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119 | fcntl (udpv4_fd, F_SETFL, O_NONBLOCK); |
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120 | |
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121 | // standard daemon practise... |
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122 | { |
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123 | int oval = 1; |
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124 | setsockopt (udpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval); |
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125 | } |
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126 | |
197 | |
127 | #if defined(SOL_IP) && defined(IP_MTU_DISCOVER) |
198 | #if defined(SOL_IP) && defined(IP_MTU_DISCOVER) |
128 | // this I really consider a linux bug. I am neither connected |
199 | // this I really consider a linux bug. I am neither connected |
129 | // nor do I fragment myself. Linux still sets DF and doesn't |
200 | // nor do I fragment myself. Linux still sets DF and doesn't |
130 | // fragment for me sometimes. |
201 | // fragment for me sometimes. |
131 | { |
202 | { |
132 | int oval = IP_PMTUDISC_DONT; |
203 | int oval = IP_PMTUDISC_DONT; |
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204 | setsockopt (ipv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval); |
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205 | } |
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206 | #endif |
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207 | |
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208 | sockinfo si (THISNODE, PROT_IPv4); |
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209 | |
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210 | if (bind (ipv4_fd, si.sav4 (), si.salenv4 ())) |
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211 | { |
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212 | slog (L_ERR, _("can't bind ipv4 socket on %s: %s, exiting."), (const char *)si, strerror (errno)); |
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213 | return -1; |
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214 | } |
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215 | |
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216 | ipv4_ev_watcher.start (ipv4_fd, EV_READ); |
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217 | ++success; |
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218 | } |
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219 | else |
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220 | THISNODE->protocols &= ~PROT_IPv4; |
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221 | |
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222 | udpv4_tos = -1; |
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223 | udpv4_fd = -1; |
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224 | |
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225 | if (THISNODE->protocols & PROT_UDPv4 && THISNODE->udp_port) |
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226 | { |
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227 | udpv4_fd = setup_socket (PROT_UDPv4, PF_INET, SOCK_DGRAM, IPPROTO_UDP); |
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228 | |
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229 | if (udpv4_fd < 0) |
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230 | return -1; |
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231 | |
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232 | // standard daemon practise... |
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233 | { |
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234 | int oval = 1; |
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235 | setsockopt (udpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval); |
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236 | } |
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237 | |
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238 | #if defined(SOL_IP) && defined(IP_MTU_DISCOVER) |
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239 | // this I really consider a linux bug. I am neither connected |
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240 | // nor do I fragment myself. Linux still sets DF and doesn't |
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241 | // fragment for me sometimes. |
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242 | { |
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243 | int oval = IP_PMTUDISC_DONT; |
133 | setsockopt (udpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval); |
244 | setsockopt (udpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval); |
134 | } |
245 | } |
135 | #endif |
246 | #endif |
136 | |
247 | |
137 | sockinfo si (THISNODE, PROT_UDPv4); |
248 | sockinfo si (THISNODE, PROT_UDPv4); |
138 | |
249 | |
139 | if (bind (udpv4_fd, si.sav4 (), si.salenv4 ())) |
250 | if (bind (udpv4_fd, si.sav4 (), si.salenv4 ())) |
140 | { |
251 | { |
141 | slog (L_ERR, _("can't bind udpv4 on %s: %s"), (const char *)si, strerror (errno)); |
252 | slog (L_ERR, _("can't bind udpv4 on %s: %s, exiting."), (const char *)si, strerror (errno)); |
142 | exit (1); |
253 | return -1; |
143 | } |
254 | } |
144 | |
255 | |
145 | udpv4_ev_watcher.start (udpv4_fd, POLLIN); |
256 | udpv4_ev_watcher.start (udpv4_fd, EV_READ); |
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257 | ++success; |
146 | } |
258 | } |
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259 | else |
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260 | THISNODE->protocols &= ~PROT_UDPv4; |
147 | |
261 | |
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262 | icmpv4_tos = -1; |
148 | icmpv4_fd = -1; |
263 | icmpv4_fd = -1; |
149 | |
264 | |
150 | #if ENABLE_ICMP |
265 | #if ENABLE_ICMP |
151 | if (THISNODE->protocols & PROT_ICMPv4) |
266 | if (THISNODE->protocols & PROT_ICMPv4) |
152 | { |
267 | { |
153 | icmpv4_fd = socket (PF_INET, SOCK_RAW, IPPROTO_ICMP); |
268 | icmpv4_fd = setup_socket (PROT_ICMPv4, PF_INET, SOCK_RAW, IPPROTO_ICMP); |
154 | |
269 | |
155 | if (icmpv4_fd < 0) |
270 | if (icmpv4_fd < 0) |
156 | return -1; |
271 | return -1; |
157 | |
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158 | fcntl (icmpv4_fd, F_SETFL, O_NONBLOCK); |
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159 | |
272 | |
160 | #ifdef ICMP_FILTER |
273 | #ifdef ICMP_FILTER |
161 | { |
274 | { |
162 | icmp_filter oval; |
275 | icmp_filter oval; |
163 | oval.data = 0xffffffff; |
276 | oval.data = 0xffffffff; |
… | |
… | |
172 | // this I really consider a linux bug. I am neither connected |
285 | // this I really consider a linux bug. I am neither connected |
173 | // nor do I fragment myself. Linux still sets DF and doesn't |
286 | // nor do I fragment myself. Linux still sets DF and doesn't |
174 | // fragment for me sometimes. |
287 | // fragment for me sometimes. |
175 | { |
288 | { |
176 | int oval = IP_PMTUDISC_DONT; |
289 | int oval = IP_PMTUDISC_DONT; |
177 | setsockopt (udpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval); |
290 | setsockopt (icmpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval); |
178 | } |
291 | } |
179 | #endif |
292 | #endif |
180 | |
293 | |
181 | sockinfo si (THISNODE, PROT_ICMPv4); |
294 | sockinfo si (THISNODE, PROT_ICMPv4); |
182 | |
295 | |
183 | if (bind (icmpv4_fd, si.sav4 (), si.salenv4 ())) |
296 | if (bind (icmpv4_fd, si.sav4 (), si.salenv4 ())) |
184 | { |
297 | { |
185 | slog (L_ERR, _("can't bind icmpv4 on %s: %s"), (const char *)si, strerror (errno)); |
298 | slog (L_ERR, _("can't bind icmpv4 on %s: %s, exiting."), (const char *)si, strerror (errno)); |
186 | exit (1); |
299 | return -1; |
187 | } |
300 | } |
188 | |
301 | |
189 | icmpv4_ev_watcher.start (icmpv4_fd, POLLIN); |
302 | icmpv4_ev_watcher.start (icmpv4_fd, EV_READ); |
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303 | ++success; |
190 | } |
304 | } |
191 | #endif |
305 | #endif |
192 | |
306 | |
193 | tcpv4_fd = -1; |
307 | tcpv4_fd = -1; |
194 | |
308 | |
195 | #if ENABLE_TCP |
309 | #if ENABLE_TCP |
196 | if (THISNODE->protocols & PROT_TCPv4 && THISNODE->tcp_port) |
310 | if (THISNODE->protocols & PROT_TCPv4 && THISNODE->tcp_port) |
197 | { |
311 | { |
198 | tcpv4_fd = socket (PF_INET, SOCK_STREAM, IPPROTO_TCP); |
312 | tcpv4_fd = setup_socket (PROT_TCPv4, PF_INET, SOCK_STREAM, IPPROTO_TCP); |
199 | |
313 | |
200 | if (tcpv4_fd < 0) |
314 | if (tcpv4_fd < 0) |
201 | return -1; |
315 | return -1; |
202 | |
316 | |
203 | fcntl (tcpv4_fd, F_SETFL, O_NONBLOCK); |
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204 | |
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205 | // standard daemon practise... |
317 | // standard daemon practise... |
206 | { |
318 | { |
207 | int oval = 1; |
319 | int oval = 1; |
208 | setsockopt (tcpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval); |
320 | setsockopt (tcpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval); |
209 | } |
321 | } |
210 | |
322 | |
211 | sockinfo si (THISNODE, PROT_TCPv4); |
323 | sockinfo si (THISNODE, PROT_TCPv4); |
212 | |
324 | |
213 | if (bind (tcpv4_fd, si.sav4 (), si.salenv4 ())) |
325 | if (bind (tcpv4_fd, si.sav4 (), si.salenv4 ())) |
214 | { |
326 | { |
215 | slog (L_ERR, _("can't bind tcpv4 on %s: %s"), (const char *)si, strerror (errno)); |
327 | slog (L_ERR, _("can't bind tcpv4 on %s: %s, exiting."), (const char *)si, strerror (errno)); |
216 | exit (1); |
328 | return -1; |
217 | } |
329 | } |
218 | |
330 | |
219 | if (listen (tcpv4_fd, 5)) |
331 | if (listen (tcpv4_fd, 5)) |
220 | { |
332 | { |
221 | slog (L_ERR, _("can't listen tcpv4 on %s: %s"), (const char *)si, strerror (errno)); |
333 | slog (L_ERR, _("can't listen tcpv4 on %s: %s, exiting."), (const char *)si, strerror (errno)); |
222 | exit (1); |
334 | return -1; |
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335 | } |
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336 | |
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337 | tcpv4_ev_watcher.start (tcpv4_fd, EV_READ); |
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338 | ++success; |
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339 | } |
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340 | else |
|
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341 | THISNODE->protocols &= ~PROT_TCPv4; |
|
|
342 | #endif |
|
|
343 | |
|
|
344 | dnsv4_tos = -1; |
|
|
345 | dnsv4_fd = -1; |
|
|
346 | |
|
|
347 | #if ENABLE_DNS |
|
|
348 | if (THISNODE->protocols & PROT_DNSv4) |
|
|
349 | { |
|
|
350 | dns_forwarder.set (::conf.dns_forw_host, ::conf.dns_forw_port, PROT_DNSv4); |
|
|
351 | |
|
|
352 | dnsv4_fd = setup_socket (PROT_DNSv4, PF_INET, SOCK_DGRAM, IPPROTO_UDP); |
|
|
353 | |
|
|
354 | if (dnsv4_fd < 0) |
|
|
355 | return -1; |
|
|
356 | |
|
|
357 | # if defined(SOL_IP) && defined(IP_MTU_DISCOVER) |
|
|
358 | // this I really consider a linux bug. I am neither connected |
|
|
359 | // nor do I fragment myself. Linux still sets DF and doesn't |
|
|
360 | // fragment for me sometimes. |
|
|
361 | { |
|
|
362 | int oval = IP_PMTUDISC_DONT; |
|
|
363 | setsockopt (dnsv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval); |
223 | } |
364 | } |
224 | |
|
|
225 | tcpv4_ev_watcher.start (tcpv4_fd, POLLIN); |
|
|
226 | } |
|
|
227 | #endif |
365 | # endif |
|
|
366 | |
|
|
367 | // standard daemon practise... |
|
|
368 | { |
|
|
369 | int oval = 1; |
|
|
370 | setsockopt (dnsv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval); |
|
|
371 | } |
|
|
372 | |
|
|
373 | sockinfo si (THISNODE->dns_hostname, |
|
|
374 | THISNODE->dns_hostname ? THISNODE->dns_port : 0, |
|
|
375 | PROT_DNSv4); |
|
|
376 | |
|
|
377 | if (bind (dnsv4_fd, si.sav4 (), si.salenv4 ())) |
|
|
378 | { |
|
|
379 | slog (L_ERR, _("can't bind dnsv4 on %s: %s, exiting."), (const char *)si, strerror (errno)); |
|
|
380 | return -1; |
|
|
381 | } |
|
|
382 | |
|
|
383 | dnsv4_ev_watcher.start (dnsv4_fd, EV_READ); |
|
|
384 | ++success; |
|
|
385 | } |
|
|
386 | #endif |
|
|
387 | |
|
|
388 | ///////////////////////////////////////////////////////////////////////////// |
|
|
389 | |
|
|
390 | if (!success) |
|
|
391 | { |
|
|
392 | slog (L_ERR, _("no protocols enabled.")); |
|
|
393 | return -1; |
|
|
394 | } |
|
|
395 | |
|
|
396 | reconnect_all (); |
|
|
397 | |
|
|
398 | ///////////////////////////////////////////////////////////////////////////// |
228 | |
399 | |
229 | tap = new tap_device (); |
400 | tap = new tap_device (); |
230 | if (!tap) //D this, of course, never catches |
401 | if (!tap) //D this, of course, never catches |
231 | { |
402 | { |
232 | slog (L_ERR, _("cannot create network interface '%s'"), conf.ifname); |
403 | slog (L_ERR, _("cannot create network interface '%s'."), conf.ifname); |
233 | exit (1); |
404 | return -1; |
234 | } |
405 | } |
235 | |
406 | |
236 | run_script (run_script_cb (this, &vpn::script_if_up), true); |
407 | fcntl (tap->fd, F_SETFD, FD_CLOEXEC); |
237 | |
408 | |
|
|
409 | run_script_cb cb; |
|
|
410 | cb.set<vpn, &vpn::script_if_init> (this); |
|
|
411 | |
|
|
412 | if (tap->if_up () && |
|
|
413 | !run_script (cb, true)) |
|
|
414 | { |
|
|
415 | slog (L_ERR, _("interface initialization command '%s' failed."), |
|
|
416 | tap->if_up ()); |
|
|
417 | return -1; |
|
|
418 | } |
|
|
419 | |
|
|
420 | cb.set<vpn, &vpn::script_if_up> (this); |
|
|
421 | if (!run_script (cb, true)) |
|
|
422 | { |
|
|
423 | slog (L_ERR, _("if-up command execution failed.")); |
|
|
424 | return -1; |
|
|
425 | } |
|
|
426 | |
238 | tap_ev_watcher.start (tap->fd, POLLIN); |
427 | tap_ev_watcher.start (tap->fd, EV_READ); |
239 | |
|
|
240 | reconnect_all (); |
|
|
241 | |
428 | |
242 | return 0; |
429 | return 0; |
243 | } |
|
|
244 | |
|
|
245 | // send a vpn packet out to other hosts |
|
|
246 | bool |
|
|
247 | vpn::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
|
|
248 | { |
|
|
249 | switch (si.prot) |
|
|
250 | { |
|
|
251 | case PROT_IPv4: |
|
|
252 | return send_ipv4_packet (pkt, si, tos); |
|
|
253 | |
|
|
254 | case PROT_UDPv4: |
|
|
255 | return send_udpv4_packet (pkt, si, tos); |
|
|
256 | |
|
|
257 | #if ENABLE_TCP |
|
|
258 | case PROT_TCPv4: |
|
|
259 | return send_tcpv4_packet (pkt, si, tos); |
|
|
260 | #endif |
|
|
261 | |
|
|
262 | #if ENABLE_ICMP |
|
|
263 | case PROT_ICMPv4: |
|
|
264 | return send_icmpv4_packet (pkt, si, tos); |
|
|
265 | #endif |
|
|
266 | |
|
|
267 | default: |
|
|
268 | slog (L_CRIT, _("%s: FATAL: trying to send packet with unsupported protocol"), (const char *)si); |
|
|
269 | return false; |
|
|
270 | } |
|
|
271 | } |
430 | } |
272 | |
431 | |
273 | bool |
432 | bool |
274 | vpn::send_ipv4_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
433 | vpn::send_ipv4_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
275 | { |
434 | { |
276 | #if defined(SOL_IP) && defined(IP_TOS) |
435 | set_tos (ipv4_fd, ipv4_tos, tos); |
277 | setsockopt (ipv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos); |
|
|
278 | #endif |
|
|
279 | sendto (ipv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ()); |
436 | sendto (ipv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ()); |
280 | |
437 | |
281 | return true; |
438 | return true; |
282 | } |
439 | } |
|
|
440 | |
|
|
441 | #if 1 //D |
|
|
442 | bool |
|
|
443 | vpn::send_ipv42_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
|
|
444 | { |
|
|
445 | set_tos (ipv42_fd, ipv42_tos, tos); |
|
|
446 | sendto (ipv42_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ()); |
|
|
447 | |
|
|
448 | return true; |
|
|
449 | } |
|
|
450 | #endif |
283 | |
451 | |
284 | static u16 |
452 | static u16 |
285 | ipv4_checksum (u16 *data, unsigned int len) |
453 | ipv4_checksum (u16 *data, unsigned int len) |
286 | { |
454 | { |
287 | // use 32 bit accumulator and fold back carry bits at the end |
455 | // use 32 bit accumulator and fold back carry bits at the end |
… | |
… | |
306 | |
474 | |
307 | #if ENABLE_ICMP |
475 | #if ENABLE_ICMP |
308 | bool |
476 | bool |
309 | vpn::send_icmpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
477 | vpn::send_icmpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
310 | { |
478 | { |
311 | #if defined(SOL_IP) && defined(IP_TOS) |
|
|
312 | setsockopt (icmpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos); |
|
|
313 | #endif |
|
|
314 | |
|
|
315 | pkt->unshift_hdr (4); |
479 | pkt->unshift_hdr (4); |
316 | |
480 | |
317 | icmp_header *hdr = (icmp_header *)&((*pkt)[0]); |
481 | icmp_header *hdr = (icmp_header *)&((*pkt)[0]); |
318 | hdr->type = ::conf.icmp_type; |
482 | hdr->type = ::conf.icmp_type; |
319 | hdr->code = 255; |
483 | hdr->code = 255; |
320 | hdr->checksum = 0; |
484 | hdr->checksum = 0; |
321 | hdr->checksum = ipv4_checksum ((u16 *)hdr, pkt->len); |
485 | hdr->checksum = ipv4_checksum ((u16 *)hdr, pkt->len); |
322 | |
486 | |
|
|
487 | set_tos (icmpv4_fd, icmpv4_tos, tos); |
323 | sendto (icmpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ()); |
488 | sendto (icmpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ()); |
324 | |
489 | |
325 | return true; |
490 | return true; |
326 | } |
491 | } |
327 | #endif |
492 | #endif |
328 | |
493 | |
329 | bool |
494 | bool |
330 | vpn::send_udpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
495 | vpn::send_udpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
331 | { |
496 | { |
332 | #if defined(SOL_IP) && defined(IP_TOS) |
497 | set_tos (udpv4_fd, udpv4_tos, tos); |
333 | setsockopt (udpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos); |
|
|
334 | #endif |
|
|
335 | sendto (udpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ()); |
498 | sendto (udpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ()); |
336 | |
499 | |
337 | return true; |
500 | return true; |
|
|
501 | } |
|
|
502 | |
|
|
503 | void |
|
|
504 | vpn::inject_data_packet (tap_packet *pkt, int dst) |
|
|
505 | { |
|
|
506 | if (dst) |
|
|
507 | { |
|
|
508 | // unicast |
|
|
509 | if (dst != THISNODE->id) |
|
|
510 | conns[dst - 1]->inject_data_packet (pkt); |
|
|
511 | } |
|
|
512 | else |
|
|
513 | { |
|
|
514 | // broadcast, this is ugly, but due to the security policy |
|
|
515 | // we have to connect to all hosts... |
|
|
516 | for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c) |
|
|
517 | if ((*c)->conf != THISNODE) |
|
|
518 | (*c)->inject_data_packet (pkt); |
|
|
519 | } |
338 | } |
520 | } |
339 | |
521 | |
340 | void |
522 | void |
341 | vpn::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi) |
523 | vpn::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi) |
342 | { |
524 | { |
343 | unsigned int src = pkt->src (); |
525 | unsigned int src = pkt->src (); |
344 | unsigned int dst = pkt->dst (); |
526 | unsigned int dst = pkt->dst (); |
345 | |
527 | |
346 | slog (L_NOISE, _("<<?/%s received possible vpn packet type %d from %d to %d, length %d"), |
528 | slog (L_NOISE, _("<<?/%s received possible vpn packet type %d from %d to %d, length %d."), |
347 | (const char *)rsi, pkt->typ (), pkt->src (), pkt->dst (), pkt->len); |
529 | (const char *)rsi, pkt->typ (), pkt->src (), pkt->dst (), pkt->len); |
348 | |
530 | |
349 | if (src == 0 || src > conns.size () |
531 | if (src == 0 || src > conns.size () |
350 | || dst > conns.size () |
532 | || dst > conns.size () |
351 | || pkt->typ () >= vpn_packet::PT_MAX) |
533 | || pkt->typ () >= vpn_packet::PT_MAX) |
352 | slog (L_WARN, _("(%s): received corrupted packet type %d (src %d, dst %d)"), |
534 | slog (L_WARN, _("(%s): received corrupted packet type %d (src %d, dst %d)."), |
353 | (const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ()); |
535 | (const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ()); |
354 | else if (dst > conns.size ()) |
|
|
355 | slog (L_WARN, _("(%s): received corrupted packet type %d (src %d, dst %d)"), |
|
|
356 | (const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ()); |
|
|
357 | else |
536 | else |
358 | { |
537 | { |
359 | connection *c = conns[src - 1]; |
538 | connection *c = conns[src - 1]; |
360 | |
539 | |
361 | if (dst == 0) |
540 | if (dst == 0) |
362 | slog (L_WARN, _("%s(%s): received broadcast (protocol violation)"), |
541 | slog (L_WARN, _("%s(%s): received broadcast (protocol violation)."), |
363 | c->conf->nodename, (const char *)rsi); |
542 | c->conf->nodename, (const char *)rsi); |
364 | else if (dst != 0 && dst != THISNODE->id) |
543 | else if (dst != THISNODE->id) |
365 | { |
544 | { |
366 | if (THISNODE->routerprio) |
545 | if (THISNODE->routerprio) |
367 | // the tos setting gets lost here. who cares. |
546 | // the tos setting gets lost here. who cares. |
368 | conns[dst - 1]->inject_vpn_packet (pkt); |
547 | conns[dst - 1]->inject_vpn_packet (pkt); |
369 | else |
548 | else |
370 | slog (L_WARN, |
549 | slog (L_WARN, |
371 | _("%s(%s): forwarding request (=> %s), but we are no router"), |
550 | _("%s(%s): request to forward packet to %s, but we are no router (config mismatch?)."), |
372 | c->conf->nodename, (const char *)rsi, |
551 | c->conf->nodename, (const char *)rsi, |
373 | conns[dst - 1]->conf->nodename); |
552 | conns[dst - 1]->conf->nodename); |
374 | } |
553 | } |
375 | else |
554 | else |
376 | c->recv_vpn_packet (pkt, rsi); |
555 | c->recv_vpn_packet (pkt, rsi); |
377 | } |
556 | } |
378 | } |
557 | } |
379 | |
558 | |
380 | void |
559 | bool |
|
|
560 | vpn::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
|
|
561 | { |
|
|
562 | switch (si.prot) |
|
|
563 | { |
|
|
564 | #if 1//D2 |
|
|
565 | case PROT_IPv42: |
|
|
566 | return send_ipv42_packet (pkt, si, tos); |
|
|
567 | #endif |
|
|
568 | |
|
|
569 | case PROT_IPv4: |
|
|
570 | return send_ipv4_packet (pkt, si, tos); |
|
|
571 | |
|
|
572 | case PROT_UDPv4: |
|
|
573 | return send_udpv4_packet (pkt, si, tos); |
|
|
574 | |
|
|
575 | #if ENABLE_TCP |
|
|
576 | case PROT_TCPv4: |
|
|
577 | return send_tcpv4_packet (pkt, si, tos); |
|
|
578 | #endif |
|
|
579 | #if ENABLE_ICMP |
|
|
580 | case PROT_ICMPv4: |
|
|
581 | return send_icmpv4_packet (pkt, si, tos); |
|
|
582 | #endif |
|
|
583 | #if ENABLE_DNS |
|
|
584 | case PROT_DNSv4: |
|
|
585 | return send_dnsv4_packet (pkt, si, tos); |
|
|
586 | #endif |
|
|
587 | default: |
|
|
588 | slog (L_CRIT, _("%s: FATAL: trying to send packet with unsupported protocol."), (const char *)si); |
|
|
589 | } |
|
|
590 | |
|
|
591 | return false; |
|
|
592 | } |
|
|
593 | |
|
|
594 | #if 1//D2 |
|
|
595 | inline void |
381 | vpn::ipv4_ev (io_watcher &w, short revents) |
596 | vpn::ipv42_ev (ev::io &w, int revents) |
382 | { |
597 | { |
383 | if (revents & (POLLIN | POLLERR)) |
598 | if (revents & EV_READ) |
384 | { |
599 | { |
385 | vpn_packet *pkt = new vpn_packet; |
600 | vpn_packet *pkt = new vpn_packet; |
386 | struct sockaddr_in sa; |
601 | struct sockaddr_in sa; |
387 | socklen_t sa_len = sizeof (sa); |
602 | socklen_t sa_len = sizeof (sa); |
388 | int len; |
603 | int len; |
389 | |
604 | |
390 | len = recvfrom (w.fd, &((*pkt)[0]), MAXSIZE, 0, (sockaddr *)&sa, &sa_len); |
605 | len = recvfrom (w.fd, &((*pkt)[0]), MAXSIZE, 0, (sockaddr *)&sa, &sa_len); |
391 | |
606 | |
|
|
607 | sockinfo si(sa, PROT_IPv42); |
|
|
608 | |
|
|
609 | if (len > 0) |
|
|
610 | { |
|
|
611 | pkt->len = len; |
|
|
612 | |
|
|
613 | // raw sockets deliver the ipv4 header, but don't expect it on sends |
|
|
614 | pkt->skip_hdr (pkt->ipv4_hdr_len ()); |
|
|
615 | |
|
|
616 | recv_vpn_packet (pkt, si); |
|
|
617 | } |
|
|
618 | else |
|
|
619 | { |
|
|
620 | // probably ECONNRESET or somesuch |
|
|
621 | slog (L_DEBUG, _("%s: %s."), (const char *)si, strerror (errno)); |
|
|
622 | } |
|
|
623 | |
|
|
624 | delete pkt; |
|
|
625 | } |
|
|
626 | else |
|
|
627 | { |
|
|
628 | slog (L_ERR, |
|
|
629 | _("FATAL: unknown revents %08x in socket, exiting.\n"), |
|
|
630 | revents); |
|
|
631 | exit (EXIT_FAILURE); |
|
|
632 | } |
|
|
633 | } |
|
|
634 | #endif |
|
|
635 | |
|
|
636 | inline void |
|
|
637 | vpn::ipv4_ev (ev::io &w, int revents) |
|
|
638 | { |
|
|
639 | if (revents & EV_READ) |
|
|
640 | { |
|
|
641 | vpn_packet *pkt = new vpn_packet; |
|
|
642 | struct sockaddr_in sa; |
|
|
643 | socklen_t sa_len = sizeof (sa); |
|
|
644 | int len; |
|
|
645 | |
|
|
646 | len = recvfrom (w.fd, &((*pkt)[0]), MAXSIZE, 0, (sockaddr *)&sa, &sa_len); |
|
|
647 | |
392 | sockinfo si(sa, PROT_IPv4); |
648 | sockinfo si(sa, PROT_IPv4); |
393 | |
649 | |
394 | if (len > 0) |
650 | if (len > 0) |
395 | { |
651 | { |
396 | pkt->len = len; |
652 | pkt->len = len; |
397 | |
653 | |
398 | // raw sockets deliver the ipv4, but don't expect it on sends |
654 | // raw sockets deliver the ipv4 header, but don't expect it on sends |
399 | // this is slow, but... |
655 | pkt->skip_hdr (pkt->ipv4_hdr_len ()); |
400 | pkt->skip_hdr (IP_OVERHEAD); |
|
|
401 | |
656 | |
402 | recv_vpn_packet (pkt, si); |
657 | recv_vpn_packet (pkt, si); |
403 | } |
658 | } |
404 | else |
659 | else |
405 | { |
660 | { |
406 | // probably ECONNRESET or somesuch |
661 | // probably ECONNRESET or somesuch |
407 | slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno)); |
662 | slog (L_DEBUG, _("%s: %s."), (const char *)si, strerror (errno)); |
408 | } |
663 | } |
409 | |
664 | |
410 | delete pkt; |
665 | delete pkt; |
411 | } |
666 | } |
412 | else if (revents & POLLHUP) |
|
|
413 | { |
|
|
414 | // this cannot ;) happen on udp sockets |
|
|
415 | slog (L_ERR, _("FATAL: POLLHUP on ipv4 fd, terminating.")); |
|
|
416 | exit (1); |
|
|
417 | } |
|
|
418 | else |
667 | else |
419 | { |
668 | { |
420 | slog (L_ERR, |
669 | slog (L_ERR, |
421 | _("FATAL: unknown revents %08x in socket, terminating\n"), |
670 | _("FATAL: unknown revents %08x in socket, exiting.\n"), |
422 | revents); |
671 | revents); |
423 | exit (1); |
672 | exit (EXIT_FAILURE); |
424 | } |
673 | } |
425 | } |
674 | } |
426 | |
675 | |
427 | #if ENABLE_ICMP |
676 | #if ENABLE_ICMP |
428 | void |
677 | inline void |
429 | vpn::icmpv4_ev (io_watcher &w, short revents) |
678 | vpn::icmpv4_ev (ev::io &w, int revents) |
430 | { |
679 | { |
431 | if (revents & (POLLIN | POLLERR)) |
680 | if (revents & EV_READ) |
432 | { |
681 | { |
433 | vpn_packet *pkt = new vpn_packet; |
682 | vpn_packet *pkt = new vpn_packet; |
434 | struct sockaddr_in sa; |
683 | struct sockaddr_in sa; |
435 | socklen_t sa_len = sizeof (sa); |
684 | socklen_t sa_len = sizeof (sa); |
436 | int len; |
685 | int len; |
… | |
… | |
448 | if (hdr->type == ::conf.icmp_type |
697 | if (hdr->type == ::conf.icmp_type |
449 | && hdr->code == 255) |
698 | && hdr->code == 255) |
450 | { |
699 | { |
451 | // raw sockets deliver the ipv4, but don't expect it on sends |
700 | // raw sockets deliver the ipv4, but don't expect it on sends |
452 | // this is slow, but... |
701 | // this is slow, but... |
453 | pkt->skip_hdr (ICMP_OVERHEAD); |
702 | pkt->skip_hdr (pkt->ipv4_hdr_len () + (ICMP_OVERHEAD - IP_OVERHEAD)); |
454 | |
703 | |
455 | recv_vpn_packet (pkt, si); |
704 | recv_vpn_packet (pkt, si); |
456 | } |
705 | } |
457 | } |
706 | } |
458 | else |
707 | else |
459 | { |
708 | { |
460 | // probably ECONNRESET or somesuch |
709 | // probably ECONNRESET or somesuch |
461 | slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno)); |
710 | slog (L_DEBUG, _("%s: %s."), (const char *)si, strerror (errno)); |
462 | } |
711 | } |
463 | |
712 | |
464 | delete pkt; |
713 | delete pkt; |
465 | } |
714 | } |
466 | else if (revents & POLLHUP) |
|
|
467 | { |
|
|
468 | // this cannot ;) happen on udp sockets |
|
|
469 | slog (L_ERR, _("FATAL: POLLHUP on icmpv4 fd, terminating.")); |
|
|
470 | exit (1); |
|
|
471 | } |
|
|
472 | else |
715 | else |
473 | { |
716 | { |
474 | slog (L_ERR, |
717 | slog (L_ERR, |
475 | _("FATAL: unknown revents %08x in socket, terminating\n"), |
718 | _("FATAL: unknown revents %08x in socket, exiting.\n"), |
476 | revents); |
719 | revents); |
477 | exit (1); |
720 | exit (EXIT_FAILURE); |
478 | } |
721 | } |
479 | } |
722 | } |
480 | #endif |
723 | #endif |
481 | |
724 | |
482 | void |
725 | inline void |
483 | vpn::udpv4_ev (io_watcher &w, short revents) |
726 | vpn::udpv4_ev (ev::io &w, int revents) |
484 | { |
727 | { |
485 | if (revents & (POLLIN | POLLERR)) |
728 | if (revents & EV_READ) |
486 | { |
729 | { |
487 | vpn_packet *pkt = new vpn_packet; |
730 | vpn_packet *pkt = new vpn_packet; |
488 | struct sockaddr_in sa; |
731 | struct sockaddr_in sa; |
489 | socklen_t sa_len = sizeof (sa); |
732 | socklen_t sa_len = sizeof (sa); |
490 | int len; |
733 | int len; |
… | |
… | |
500 | recv_vpn_packet (pkt, si); |
743 | recv_vpn_packet (pkt, si); |
501 | } |
744 | } |
502 | else |
745 | else |
503 | { |
746 | { |
504 | // probably ECONNRESET or somesuch |
747 | // probably ECONNRESET or somesuch |
505 | slog (L_DEBUG, _("%s: fd %d, %s"), (const char *)si, w.fd, strerror (errno)); |
748 | slog (L_DEBUG, _("%s: fd %d, %s."), (const char *)si, w.fd, strerror (errno)); |
506 | } |
749 | } |
507 | |
750 | |
508 | delete pkt; |
751 | delete pkt; |
509 | } |
752 | } |
510 | else if (revents & POLLHUP) |
|
|
511 | { |
|
|
512 | // this cannot ;) happen on udp sockets |
|
|
513 | slog (L_ERR, _("FATAL: POLLHUP on udp v4 fd, terminating.")); |
|
|
514 | exit (1); |
|
|
515 | } |
|
|
516 | else |
753 | else |
517 | { |
754 | { |
518 | slog (L_ERR, |
755 | slog (L_ERR, |
519 | _("FATAL: unknown revents %08x in socket, terminating\n"), |
756 | _("FATAL: unknown revents %08x in socket, exiting.\n"), |
520 | revents); |
757 | revents); |
521 | exit (1); |
758 | exit (EXIT_FAILURE); |
522 | } |
759 | } |
523 | } |
760 | } |
524 | |
761 | |
525 | void |
762 | inline void |
526 | vpn::tap_ev (io_watcher &w, short revents) |
763 | vpn::tap_ev (ev::io &w, int revents) |
527 | { |
764 | { |
528 | if (revents & POLLIN) |
765 | if (revents & EV_READ) |
529 | { |
766 | { |
530 | /* process data */ |
767 | /* process data */ |
531 | tap_packet *pkt; |
768 | tap_packet *pkt; |
532 | |
769 | |
533 | pkt = tap->recv (); |
770 | pkt = tap->recv (); |
534 | |
771 | |
|
|
772 | if (!pkt) |
|
|
773 | return; |
|
|
774 | |
|
|
775 | if (pkt->len > 14) |
|
|
776 | { |
535 | int dst = mac2id (pkt->dst); |
777 | int dst = mac2id (pkt->dst); |
536 | int src = mac2id (pkt->src); |
778 | int src = mac2id (pkt->src); |
537 | |
779 | |
538 | if (src != THISNODE->id) |
780 | if (src != THISNODE->id) |
539 | { |
|
|
540 | slog (L_ERR, _("FATAL: tap packet not originating on current node received, exiting.")); |
|
|
541 | exit (1); |
|
|
542 | } |
|
|
543 | |
|
|
544 | if (dst == THISNODE->id) |
|
|
545 | { |
|
|
546 | slog (L_ERR, _("FATAL: tap packet destined for current node received, exiting.")); |
|
|
547 | exit (1); |
|
|
548 | } |
|
|
549 | |
|
|
550 | if (dst > conns.size ()) |
|
|
551 | slog (L_ERR, _("tap packet for unknown node %d received, ignoring."), dst); |
|
|
552 | else |
|
|
553 | { |
|
|
554 | if (dst) |
|
|
555 | { |
781 | { |
556 | // unicast |
782 | slog (L_ERR, _("FATAL: tap packet not originating on current node received (if-up script not working properly?), exiting.")); |
557 | if (dst != THISNODE->id) |
783 | exit (EXIT_FAILURE); |
558 | conns[dst - 1]->inject_data_packet (pkt); |
|
|
559 | } |
784 | } |
|
|
785 | |
|
|
786 | if (dst == THISNODE->id) |
|
|
787 | { |
|
|
788 | slog (L_ERR, _("FATAL: tap packet destined for current node received, exiting.")); |
|
|
789 | exit (EXIT_FAILURE); |
|
|
790 | } |
|
|
791 | |
|
|
792 | if (dst > conns.size ()) |
|
|
793 | slog (L_ERR, _("tap packet for unknown node %d received, ignoring."), dst); |
560 | else |
794 | else |
561 | { |
|
|
562 | // broadcast, this is ugly, but due to the security policy |
|
|
563 | // we have to connect to all hosts... |
|
|
564 | for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c) |
|
|
565 | if ((*c)->conf != THISNODE) |
|
|
566 | (*c)->inject_data_packet (pkt); |
795 | inject_data_packet (pkt, dst); |
567 | } |
|
|
568 | } |
796 | } |
569 | |
797 | |
570 | delete pkt; |
798 | delete pkt; |
571 | } |
799 | } |
572 | else if (revents & (POLLHUP | POLLERR)) |
|
|
573 | { |
|
|
574 | slog (L_ERR, _("FATAL: POLLHUP or POLLERR on network device fd, terminating.")); |
|
|
575 | exit (1); |
|
|
576 | } |
|
|
577 | else |
800 | else |
578 | abort (); |
801 | abort (); |
579 | } |
802 | } |
580 | |
803 | |
581 | void |
804 | inline void |
582 | vpn::event_cb (time_watcher &w) |
805 | vpn::event_cb (ev::timer &w, int) |
583 | { |
806 | { |
584 | if (events) |
807 | if (events) |
585 | { |
808 | { |
586 | if (events & EVENT_SHUTDOWN) |
809 | if (events & EVENT_SHUTDOWN) |
587 | { |
810 | { |
588 | slog (L_INFO, _("preparing shutdown...")); |
811 | slog (L_INFO, _("preparing shutdown...")); |
589 | |
812 | |
590 | shutdown_all (); |
813 | shutdown_all (); |
591 | |
|
|
592 | remove_pid (pidfilename); |
814 | remove_pid (conf.pidfilename); |
593 | |
|
|
594 | slog (L_INFO, _("terminating")); |
815 | slog (L_INFO, _("exiting.")); |
595 | |
816 | exit (EXIT_SUCCESS); |
596 | exit (0); |
|
|
597 | } |
817 | } |
598 | |
818 | |
599 | if (events & EVENT_RECONNECT) |
819 | if (events & EVENT_RECONNECT) |
600 | { |
820 | { |
601 | slog (L_INFO, _("forced reconnect")); |
821 | slog (L_INFO, _("forced reconnect.")); |
602 | |
822 | |
603 | reconnect_all (); |
823 | reconnect_all (); |
604 | } |
824 | } |
605 | |
825 | |
606 | events = 0; |
826 | events = 0; |
607 | } |
827 | } |
608 | |
|
|
609 | w.at = TSTAMP_CANCEL; |
|
|
610 | } |
828 | } |
611 | |
829 | |
612 | void |
830 | void |
613 | vpn::shutdown_all () |
831 | vpn::shutdown_all () |
614 | { |
832 | { |
… | |
… | |
624 | |
842 | |
625 | conns.clear (); |
843 | conns.clear (); |
626 | |
844 | |
627 | connection_init (); |
845 | connection_init (); |
628 | |
846 | |
629 | for (configuration::node_vector::iterator i = conf.nodes.begin (); |
847 | for (configuration::node_vector::iterator i = conf.nodes.begin (); i != conf.nodes.end (); ++i) |
630 | i != conf.nodes.end (); ++i) |
848 | conns.push_back (new connection (this, *i)); |
631 | { |
|
|
632 | connection *conn = new connection (this); |
|
|
633 | |
849 | |
634 | conn->conf = *i; |
850 | for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c) |
635 | conns.push_back (conn); |
|
|
636 | |
|
|
637 | conn->establish_connection (); |
851 | (*c)->establish_connection (); |
638 | } |
|
|
639 | } |
852 | } |
640 | |
853 | |
641 | connection *vpn::find_router () |
854 | bool |
|
|
855 | vpn::can_direct (conf_node *src, conf_node *dst) const |
642 | { |
856 | { |
643 | u32 prio = 1; |
857 | return src != dst |
|
|
858 | && src->may_direct (dst) |
|
|
859 | && dst->may_direct (src) |
|
|
860 | && (((src->protocols & dst->protocols) && src->connectmode == conf_node::C_ALWAYS) |
|
|
861 | || (src->protocols & dst->connectable_protocols ())); |
|
|
862 | } |
|
|
863 | |
|
|
864 | // only works for indirect and routed connections: find a router |
|
|
865 | // from THISNODE to dst |
|
|
866 | connection * |
|
|
867 | vpn::find_router_for (const connection *dst) |
|
|
868 | { |
644 | connection *router = 0; |
869 | connection *router = 0; |
645 | |
870 | |
|
|
871 | // first try to find a router with a direct connection, route there |
|
|
872 | // regardless of any other considerations. |
|
|
873 | { |
|
|
874 | u32 prio = 1; |
|
|
875 | |
|
|
876 | for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i) |
|
|
877 | { |
|
|
878 | connection *c = *i; |
|
|
879 | |
|
|
880 | if (c->conf->routerprio > prio |
|
|
881 | && c->conf != THISNODE |
|
|
882 | && can_direct (c->conf, dst->conf) |
|
|
883 | && c->ictx && c->octx) |
|
|
884 | { |
|
|
885 | prio = c->conf->routerprio; |
|
|
886 | router = c; |
|
|
887 | } |
|
|
888 | } |
|
|
889 | } |
|
|
890 | |
|
|
891 | if (router) |
|
|
892 | return router; |
|
|
893 | |
|
|
894 | // second try find the router with the highest priority, higher than ours |
|
|
895 | { |
|
|
896 | u32 prio = THISNODE->routerprio ? THISNODE->routerprio : 1; |
|
|
897 | |
|
|
898 | for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i) |
|
|
899 | { |
|
|
900 | connection *c = *i; |
|
|
901 | |
|
|
902 | if (c->conf->routerprio > prio |
|
|
903 | && c != dst |
|
|
904 | && c->conf != THISNODE |
|
|
905 | && c->ictx && c->octx) |
|
|
906 | { |
|
|
907 | prio = c->conf->routerprio; |
|
|
908 | router = c; |
|
|
909 | } |
|
|
910 | } |
|
|
911 | } |
|
|
912 | |
|
|
913 | return router; |
|
|
914 | } |
|
|
915 | |
|
|
916 | void |
|
|
917 | vpn::connection_established (connection *c) |
|
|
918 | { |
646 | for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i) |
919 | for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i) |
647 | { |
920 | { |
648 | connection *c = *i; |
921 | connection *o = *i; |
649 | |
922 | |
650 | if (c->conf->routerprio > prio |
923 | if (!o->is_direct |
651 | && c->connectmode == conf_node::C_ALWAYS // so we don't drop the connection if in use |
924 | && o->si.valid () |
652 | && c->ictx && c->octx |
925 | && c->si != o->si |
653 | && c->conf != THISNODE) // redundant, since ictx==octx==0 always on thisnode |
926 | && c == find_router_for (o)) |
654 | { |
|
|
655 | prio = c->conf->routerprio; |
|
|
656 | router = c; |
|
|
657 | } |
927 | { |
|
|
928 | slog (L_DEBUG, _("%s: can now route packets via %s, re-keying connection."), |
|
|
929 | o->conf->nodename, c->conf->nodename); |
|
|
930 | o->rekey (); |
|
|
931 | } |
658 | } |
932 | } |
659 | |
|
|
660 | return router; |
|
|
661 | } |
933 | } |
662 | |
934 | |
|
|
935 | void |
663 | void vpn::send_connect_request (int id) |
936 | vpn::send_connect_request (connection *c) |
664 | { |
937 | { |
665 | connection *c = find_router (); |
938 | connection *r = find_router_for (c); |
666 | |
939 | |
667 | if (c) |
940 | if (r) |
|
|
941 | { |
|
|
942 | slog (L_TRACE, _("%s: no address known, sending mediated connection request via %s."), |
|
|
943 | c->conf->nodename, r->conf->nodename); |
668 | c->send_connect_request (id); |
944 | r->send_connect_request (c->conf->id); |
|
|
945 | } |
669 | else |
946 | else |
670 | // no router found, aggressively connect to all routers |
947 | slog (L_DEBUG, _("%s: no way to connect and no router found: unable to connect at this time."), |
671 | for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i) |
948 | c->conf->nodename); |
672 | if ((*i)->conf->routerprio && (*i)->conf != THISNODE) |
|
|
673 | (*i)->establish_connection (); |
|
|
674 | } |
949 | } |
675 | |
950 | |
676 | void |
951 | void |
677 | connection::dump_status () |
952 | connection::dump_status () |
678 | { |
953 | { |
679 | slog (L_NOTICE, _("node %s (id %d)"), conf->nodename, conf->id); |
954 | slog (L_NOTICE, _("node %s (id %d)"), conf->nodename, conf->id); |
680 | slog (L_NOTICE, _(" connectmode %d (%d) / sockaddr %s / minor %d"), |
955 | slog (L_NOTICE, _(" connectmode %d (%d) / sockaddr %s / minor %d"), |
681 | connectmode, conf->connectmode, (const char *)si, (int)prot_minor); |
956 | connectmode, conf->connectmode, (const char *)si, (int)prot_minor); |
682 | slog (L_NOTICE, _(" ictx/octx %08lx/%08lx / oseqno %d / retry_cnt %d"), |
957 | slog (L_NOTICE, _(" ictx/octx %08lx/%08lx / oseqno %d / retry_cnt %d"), |
683 | (long)ictx, (long)octx, (int)oseqno, (int)retry_cnt); |
958 | (long)ictx, (long)octx, (int)oseqno, (int)retry_cnt); |
684 | slog (L_NOTICE, _(" establish_conn %ld / rekey %ld / keepalive %ld"), |
|
|
685 | (long)(establish_connection.at), (long)(rekey.at), (long)(keepalive.at)); |
|
|
686 | } |
959 | } |
687 | |
960 | |
688 | void |
961 | void |
689 | vpn::dump_status () |
962 | vpn::dump_status () |
690 | { |
963 | { |
691 | slog (L_NOTICE, _("BEGIN status dump (%ld)"), (long)NOW); |
964 | slog (L_NOTICE, _("BEGIN status dump (%ld)"), (long)ev_now ()); |
692 | |
965 | |
693 | for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c) |
966 | for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c) |
694 | (*c)->dump_status (); |
967 | (*c)->dump_status (); |
695 | |
968 | |
696 | slog (L_NOTICE, _("END status dump")); |
969 | slog (L_NOTICE, _("END status dump")); |
697 | } |
970 | } |
698 | |
971 | |
699 | vpn::vpn (void) |
972 | vpn::vpn (void) |
|
|
973 | { |
700 | : event (this, &vpn::event_cb) |
974 | event .set<vpn, &vpn::event_cb > (this); |
701 | , udpv4_ev_watcher (this, &vpn::udpv4_ev) |
975 | udpv4_ev_watcher .set<vpn, &vpn::udpv4_ev > (this); |
702 | , ipv4_ev_watcher (this, &vpn::ipv4_ev) |
976 | ipv4_ev_watcher .set<vpn, &vpn::ipv4_ev > (this); |
|
|
977 | #if 1//D2 |
|
|
978 | ipv42_ev_watcher .set<vpn, &vpn::ipv42_ev > (this); |
|
|
979 | #endif |
703 | #if ENABLE_TCP |
980 | #if ENABLE_TCP |
704 | , tcpv4_ev_watcher (this, &vpn::tcpv4_ev) |
981 | tcpv4_ev_watcher .set<vpn, &vpn::tcpv4_ev > (this); |
705 | #endif |
982 | #endif |
706 | #if ENABLE_ICMP |
983 | #if ENABLE_ICMP |
707 | , icmpv4_ev_watcher(this, &vpn::icmpv4_ev) |
984 | icmpv4_ev_watcher.set<vpn, &vpn::icmpv4_ev> (this); |
708 | #endif |
985 | #endif |
709 | , tap_ev_watcher (this, &vpn::tap_ev) |
986 | #if ENABLE_DNS |
710 | { |
987 | dnsv4_ev_watcher .set<vpn, &vpn::dnsv4_ev > (this); |
|
|
988 | #endif |
|
|
989 | tap_ev_watcher .set<vpn, &vpn::tap_ev > (this); |
711 | } |
990 | } |
712 | |
991 | |
713 | vpn::~vpn () |
992 | vpn::~vpn () |
714 | { |
993 | { |
715 | } |
994 | } |