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 <netinet/in.h> |
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32 | #include <arpa/inet.h> |
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33 | #include <errno.h> |
43 | #include <errno.h> |
34 | #include <time.h> |
44 | #include <time.h> |
35 | #include <unistd.h> |
45 | #include <unistd.h> |
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46 | #include <fcntl.h> |
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47 | #include <sys/socket.h> |
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48 | |
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49 | #include "netcompat.h" |
36 | |
50 | |
37 | #include "pidfile.h" |
51 | #include "pidfile.h" |
38 | |
52 | |
39 | #include "connection.h" |
53 | #include "connection.h" |
40 | #include "util.h" |
54 | #include "util.h" |
41 | #include "vpn.h" |
55 | #include "vpn.h" |
42 | |
56 | |
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57 | vpn network; // THE vpn (bad design...) |
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58 | |
43 | ///////////////////////////////////////////////////////////////////////////// |
59 | ///////////////////////////////////////////////////////////////////////////// |
44 | |
60 | |
45 | 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 () |
46 | { |
75 | { |
47 | // the tunnel device mtu should be the physical mtu - overhead |
76 | // the tunnel device mtu should be the physical mtu - overhead |
48 | // the tricky part is rounding to the cipher key blocksize |
77 | // the tricky part is rounding to the cipher key blocksize |
49 | int mtu = conf.mtu - ETH_OVERHEAD - VPE_OVERHEAD - MAX_OVERHEAD; |
78 | int mtu = conf.mtu - ETH_OVERHEAD - VPE_OVERHEAD - MAX_OVERHEAD; |
50 | mtu += ETH_OVERHEAD - 6 - 6; // now we have the data portion |
79 | mtu += ETH_OVERHEAD - 6 - 6; // now we have the data portion |
51 | mtu -= mtu % EVP_CIPHER_block_size (CIPHER); // round |
80 | mtu -= mtu % EVP_CIPHER_block_size (CIPHER); // round |
52 | mtu -= ETH_OVERHEAD - 6 - 6; // and get interface mtu again |
81 | mtu -= ETH_OVERHEAD - 6 - 6; // and get interface mtu again |
53 | |
82 | |
54 | char *env; |
83 | char *env; |
55 | asprintf (&env, "CONFBASE=%s", confbase); |
84 | 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 ()); |
85 | asprintf (&env, "IFNAME=%s", tap->interface ()); putenv (env); |
62 | putenv (env); |
86 | asprintf (&env, "IFTYPE=%s", IFTYPE); putenv (env); |
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87 | asprintf (&env, "IFSUBTYPE=%s", IFSUBTYPE); putenv (env); |
63 | asprintf (&env, "MTU=%d", mtu); |
88 | asprintf (&env, "MTU=%d", mtu); putenv (env); |
64 | putenv (env); |
89 | asprintf (&env, "NODES=%d", conns.size ()); putenv (env); |
65 | asprintf (&env, "MAC=%02x:%02x:%02x:%02x:%02x:%02x", |
90 | 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 | |
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, |
70 | 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; |
71 | } |
145 | } |
72 | |
146 | |
73 | int |
147 | int |
74 | vpn::setup () |
148 | vpn::setup () |
75 | { |
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; |
76 | udpv4_fd = -1; |
154 | ipv42_fd = -1; |
77 | |
155 | |
78 | if (THISNODE->protocols & PROT_UDPv4) |
156 | if (THISNODE->protocols & PROT_IPv42 && ::conf.ip_proto) |
79 | { |
157 | { |
80 | udpv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP); |
158 | ipv42_fd = setup_socket (PROT_IPv42, PF_INET, SOCK_RAW, ::conf.ip2_proto); |
81 | |
159 | |
82 | if (udpv4_fd < 0) |
160 | if (ipv42_fd < 0) |
83 | return -1; |
161 | return -1; |
84 | |
162 | |
85 | // standard daemon practise... |
163 | #if defined(SOL_IP) && defined(IP_MTU_DISCOVER) |
86 | { |
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87 | int oval = 1; |
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88 | setsockopt (udpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval); |
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89 | } |
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90 | |
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91 | sockinfo si (THISNODE, PROT_UDPv4); |
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92 | |
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93 | if (bind (udpv4_fd, si.sav4 (), si.salenv4 ())) |
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94 | { |
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95 | slog (L_ERR, _("can't bind udpv4 on %s: %s"), (const char *)si, strerror (errno)); |
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96 | exit (1); |
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97 | } |
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98 | |
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99 | #ifdef IP_MTU_DISCOVER |
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100 | // this I really consider a linux bug. I am neither connected |
164 | // this I really consider a linux bug. I am neither connected |
101 | // 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 |
102 | // fragment for me sometimes. |
166 | // fragment for me sometimes. |
103 | { |
167 | { |
104 | int oval = IP_PMTUDISC_DONT; |
168 | int oval = IP_PMTUDISC_DONT; |
105 | setsockopt (udpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval); |
169 | setsockopt (ipv42_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval); |
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170 | } |
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171 | #endif |
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172 | |
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173 | sockinfo si (THISNODE, PROT_IPv42); |
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174 | |
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175 | if (bind (ipv42_fd, si.sav4 (), si.salenv4 ())) |
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176 | { |
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177 | slog (L_ERR, _("can't bind ipv42 socket on %s: %s, exiting."), (const char *)si, strerror (errno)); |
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178 | return -1; |
106 | } |
179 | } |
107 | #endif |
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108 | |
180 | |
109 | udpv4_ev_watcher.start (udpv4_fd, POLLIN); |
181 | ipv42_ev_watcher.start (ipv42_fd, EV_READ); |
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182 | ++success; |
110 | } |
183 | } |
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184 | else |
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185 | THISNODE->protocols &= ~PROT_IPv42; |
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186 | #endif |
111 | |
187 | |
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188 | ipv4_tos = -1; |
112 | ipv4_fd = -1; |
189 | ipv4_fd = -1; |
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190 | |
113 | if (THISNODE->protocols & PROT_IPv4) |
191 | if (THISNODE->protocols & PROT_IPv4 && ::conf.ip_proto) |
114 | { |
192 | { |
115 | ipv4_fd = socket (PF_INET, SOCK_RAW, ::conf.ip_proto); |
193 | ipv4_fd = setup_socket (PROT_IPv4, PF_INET, SOCK_RAW, ::conf.ip_proto); |
116 | |
194 | |
117 | if (ipv4_fd < 0) |
195 | if (ipv4_fd < 0) |
118 | return -1; |
196 | return -1; |
119 | |
197 | |
120 | sockinfo si (THISNODE, PROT_IPv4); |
198 | #if defined(SOL_IP) && defined(IP_MTU_DISCOVER) |
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 on %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 |
199 | // this I really consider a linux bug. I am neither connected |
130 | // 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 |
131 | // fragment for me sometimes. |
201 | // fragment for me sometimes. |
132 | { |
202 | { |
133 | int oval = IP_PMTUDISC_DONT; |
203 | int oval = IP_PMTUDISC_DONT; |
134 | setsockopt (ipv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval); |
204 | setsockopt (ipv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval); |
135 | } |
205 | } |
136 | #endif |
206 | #endif |
137 | |
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 | |
138 | ipv4_ev_watcher.start (ipv4_fd, POLLIN); |
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); |
139 | } |
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; |
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244 | setsockopt (udpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval); |
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245 | } |
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246 | #endif |
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247 | |
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248 | sockinfo si (THISNODE, PROT_UDPv4); |
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249 | |
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250 | if (bind (udpv4_fd, si.sav4 (), si.salenv4 ())) |
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251 | { |
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252 | slog (L_ERR, _("can't bind udpv4 on %s: %s, exiting."), (const char *)si, strerror (errno)); |
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253 | return -1; |
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254 | } |
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255 | |
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256 | udpv4_ev_watcher.start (udpv4_fd, EV_READ); |
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257 | ++success; |
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258 | } |
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259 | else |
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260 | THISNODE->protocols &= ~PROT_UDPv4; |
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261 | |
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262 | icmpv4_tos = -1; |
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263 | icmpv4_fd = -1; |
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264 | |
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265 | #if ENABLE_ICMP |
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266 | if (THISNODE->protocols & PROT_ICMPv4) |
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267 | { |
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268 | icmpv4_fd = setup_socket (PROT_ICMPv4, PF_INET, SOCK_RAW, IPPROTO_ICMP); |
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269 | |
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270 | if (icmpv4_fd < 0) |
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271 | return -1; |
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272 | |
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273 | #ifdef ICMP_FILTER |
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274 | { |
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275 | icmp_filter oval; |
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276 | oval.data = 0xffffffff; |
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277 | if (::conf.icmp_type < 32) |
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278 | oval.data &= ~(1 << ::conf.icmp_type); |
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279 | |
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280 | setsockopt (icmpv4_fd, SOL_RAW, ICMP_FILTER, &oval, sizeof oval); |
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281 | } |
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282 | #endif |
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283 | |
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284 | #if defined(SOL_IP) && defined(IP_MTU_DISCOVER) |
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285 | // this I really consider a linux bug. I am neither connected |
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286 | // nor do I fragment myself. Linux still sets DF and doesn't |
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287 | // fragment for me sometimes. |
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288 | { |
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289 | int oval = IP_PMTUDISC_DONT; |
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290 | setsockopt (icmpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval); |
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291 | } |
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292 | #endif |
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293 | |
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294 | sockinfo si (THISNODE, PROT_ICMPv4); |
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295 | |
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296 | if (bind (icmpv4_fd, si.sav4 (), si.salenv4 ())) |
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297 | { |
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298 | slog (L_ERR, _("can't bind icmpv4 on %s: %s, exiting."), (const char *)si, strerror (errno)); |
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299 | return -1; |
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300 | } |
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301 | |
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302 | icmpv4_ev_watcher.start (icmpv4_fd, EV_READ); |
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303 | ++success; |
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304 | } |
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305 | #endif |
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306 | |
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307 | tcpv4_fd = -1; |
140 | |
308 | |
141 | #if ENABLE_TCP |
309 | #if ENABLE_TCP |
142 | if (THISNODE->protocols & PROT_TCPv4) |
310 | if (THISNODE->protocols & PROT_TCPv4 && THISNODE->tcp_port) |
143 | { |
311 | { |
144 | tcpv4_fd = socket (PF_INET, SOCK_STREAM, IPPROTO_TCP); |
312 | tcpv4_fd = setup_socket (PROT_TCPv4, PF_INET, SOCK_STREAM, IPPROTO_TCP); |
145 | |
313 | |
146 | if (tcpv4_fd < 0) |
314 | if (tcpv4_fd < 0) |
147 | return -1; |
315 | return -1; |
148 | |
316 | |
149 | // standard daemon practise... |
317 | // standard daemon practise... |
… | |
… | |
154 | |
322 | |
155 | sockinfo si (THISNODE, PROT_TCPv4); |
323 | sockinfo si (THISNODE, PROT_TCPv4); |
156 | |
324 | |
157 | if (bind (tcpv4_fd, si.sav4 (), si.salenv4 ())) |
325 | if (bind (tcpv4_fd, si.sav4 (), si.salenv4 ())) |
158 | { |
326 | { |
159 | 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)); |
160 | exit (1); |
328 | return -1; |
161 | } |
329 | } |
162 | |
330 | |
163 | if (listen (tcpv4_fd, 5)) |
331 | if (listen (tcpv4_fd, 5)) |
164 | { |
332 | { |
165 | 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)); |
166 | 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; |
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342 | #endif |
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343 | |
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344 | dnsv4_tos = -1; |
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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); |
167 | } |
364 | } |
168 | |
|
|
169 | tcpv4_ev_watcher.start (tcpv4_fd, POLLIN); |
|
|
170 | } |
|
|
171 | #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 | ///////////////////////////////////////////////////////////////////////////// |
172 | |
399 | |
173 | tap = new tap_device (); |
400 | tap = new tap_device (); |
174 | if (!tap) //D this, of course, never catches |
401 | if (!tap) //D this, of course, never catches |
175 | { |
402 | { |
176 | slog (L_ERR, _("cannot create network interface '%s'"), conf.ifname); |
403 | slog (L_ERR, _("cannot create network interface '%s'."), conf.ifname); |
177 | exit (1); |
404 | return -1; |
178 | } |
405 | } |
179 | |
406 | |
180 | run_script (run_script_cb (this, &vpn::script_if_up), true); |
407 | fcntl (tap->fd, F_SETFD, FD_CLOEXEC); |
181 | |
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 | |
182 | tap_ev_watcher.start (tap->fd, POLLIN); |
427 | tap_ev_watcher.start (tap->fd, EV_READ); |
183 | |
|
|
184 | reconnect_all (); |
|
|
185 | |
428 | |
186 | return 0; |
429 | return 0; |
187 | } |
430 | } |
188 | |
431 | |
189 | // send a vpn packet out to other hosts |
432 | bool |
|
|
433 | vpn::send_ipv4_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
|
|
434 | { |
|
|
435 | set_tos (ipv4_fd, ipv4_tos, tos); |
|
|
436 | sendto (ipv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ()); |
|
|
437 | |
|
|
438 | return true; |
|
|
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 |
|
|
451 | |
|
|
452 | static u16 |
|
|
453 | ipv4_checksum (u16 *data, unsigned int len) |
|
|
454 | { |
|
|
455 | // use 32 bit accumulator and fold back carry bits at the end |
|
|
456 | u32 sum = 0; |
|
|
457 | |
|
|
458 | while (len > 1) |
|
|
459 | { |
|
|
460 | sum += *data++; |
|
|
461 | len -= 2; |
|
|
462 | } |
|
|
463 | |
|
|
464 | // odd byte left? |
|
|
465 | if (len) |
|
|
466 | sum += *(u8 *)data; |
|
|
467 | |
|
|
468 | // add back carry bits |
|
|
469 | sum = (sum >> 16) + (sum & 0xffff); // lo += hi |
|
|
470 | sum += (sum >> 16); // carry |
|
|
471 | |
|
|
472 | return ~sum; |
|
|
473 | } |
|
|
474 | |
|
|
475 | #if ENABLE_ICMP |
|
|
476 | bool |
|
|
477 | vpn::send_icmpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
|
|
478 | { |
|
|
479 | pkt->unshift_hdr (4); |
|
|
480 | |
|
|
481 | icmp_header *hdr = (icmp_header *)&((*pkt)[0]); |
|
|
482 | hdr->type = ::conf.icmp_type; |
|
|
483 | hdr->code = 255; |
|
|
484 | hdr->checksum = 0; |
|
|
485 | hdr->checksum = ipv4_checksum ((u16 *)hdr, pkt->len); |
|
|
486 | |
|
|
487 | set_tos (icmpv4_fd, icmpv4_tos, tos); |
|
|
488 | sendto (icmpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ()); |
|
|
489 | |
|
|
490 | return true; |
|
|
491 | } |
|
|
492 | #endif |
|
|
493 | |
|
|
494 | bool |
|
|
495 | vpn::send_udpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
|
|
496 | { |
|
|
497 | set_tos (udpv4_fd, udpv4_tos, tos); |
|
|
498 | sendto (udpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ()); |
|
|
499 | |
|
|
500 | return true; |
|
|
501 | } |
|
|
502 | |
190 | void |
503 | void |
191 | vpn::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
504 | vpn::inject_data_packet (tap_packet *pkt, int dst) |
192 | { |
505 | { |
193 | switch (si.prot) |
506 | if (dst) |
194 | { |
|
|
195 | case PROT_IPv4: |
|
|
196 | send_ipv4_packet (pkt, si, tos); |
|
|
197 | break; |
|
|
198 | |
|
|
199 | case PROT_UDPv4: |
|
|
200 | send_udpv4_packet (pkt, si, tos); |
|
|
201 | break; |
|
|
202 | |
|
|
203 | #if ENABLE_TCP |
|
|
204 | case PROT_TCPv4: |
|
|
205 | send_tcpv4_packet (pkt, si, tos); |
|
|
206 | break; |
|
|
207 | #endif |
|
|
208 | |
|
|
209 | default: |
|
|
210 | slog (L_CRIT, _("%s: FATAL: trying to send packet with unsupported protocol"), (const char *)si); |
|
|
211 | abort (); |
|
|
212 | } |
507 | { |
213 | } |
508 | // unicast |
214 | |
509 | if (dst != THISNODE->id) |
215 | void |
510 | conns[dst - 1]->inject_data_packet (pkt); |
216 | vpn::send_ipv4_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
511 | } |
217 | { |
512 | else |
218 | setsockopt (ipv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos); |
513 | { |
219 | sendto (ipv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ()); |
514 | // broadcast, this is ugly, but due to the security policy |
220 | } |
515 | // we have to connect to all hosts... |
221 | |
516 | for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c) |
222 | void |
517 | if ((*c)->conf != THISNODE) |
223 | vpn::send_udpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
518 | (*c)->inject_data_packet (pkt); |
224 | { |
519 | } |
225 | setsockopt (udpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos); |
|
|
226 | sendto (udpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ()); |
|
|
227 | } |
520 | } |
228 | |
521 | |
229 | void |
522 | void |
230 | vpn::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi) |
523 | vpn::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi) |
231 | { |
524 | { |
232 | unsigned int src = pkt->src (); |
525 | unsigned int src = pkt->src (); |
233 | unsigned int dst = pkt->dst (); |
526 | unsigned int dst = pkt->dst (); |
234 | |
527 | |
235 | 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."), |
236 | (const char *)rsi, pkt->typ (), pkt->src (), pkt->dst (), pkt->len); |
529 | (const char *)rsi, pkt->typ (), pkt->src (), pkt->dst (), pkt->len); |
237 | |
530 | |
238 | if (src == 0 || src > conns.size () |
531 | if (src == 0 || src > conns.size () |
239 | || dst > conns.size () |
532 | || dst > conns.size () |
240 | || pkt->typ () >= vpn_packet::PT_MAX) |
533 | || pkt->typ () >= vpn_packet::PT_MAX) |
241 | 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)."), |
242 | (const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ()); |
535 | (const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ()); |
243 | else if (dst > conns.size ()) |
|
|
244 | slog (L_WARN, _("(%s): received corrupted packet type %d (src %d, dst %d)"), |
|
|
245 | (const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ()); |
|
|
246 | else |
536 | else |
247 | { |
537 | { |
248 | connection *c = conns[src - 1]; |
538 | connection *c = conns[src - 1]; |
249 | |
539 | |
250 | if (dst == 0 && !THISNODE->routerprio) |
540 | if (dst == 0) |
251 | slog (L_WARN, _("%s(%s): received broadcast, but we are no router"), |
541 | slog (L_WARN, _("%s(%s): received broadcast (protocol violation)."), |
252 | c->conf->nodename, (const char *)rsi); |
542 | c->conf->nodename, (const char *)rsi); |
253 | else if (dst != 0 && dst != THISNODE->id) |
543 | else if (dst != THISNODE->id) |
254 | { |
544 | { |
255 | if (THISNODE->routerprio) |
545 | if (THISNODE->routerprio) |
256 | // the tos setting gets lost here. who cares. |
546 | // the tos setting gets lost here. who cares. |
257 | conns[dst - 1]->inject_vpn_packet (pkt); |
547 | conns[dst - 1]->inject_vpn_packet (pkt); |
258 | else |
548 | else |
259 | slog (L_WARN, |
549 | slog (L_WARN, |
260 | _("%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?)."), |
261 | c->conf->nodename, (const char *)rsi, |
551 | c->conf->nodename, (const char *)rsi, |
262 | conns[dst - 1]->conf->nodename); |
552 | conns[dst - 1]->conf->nodename); |
263 | } |
553 | } |
264 | else |
554 | else |
265 | c->recv_vpn_packet (pkt, rsi); |
555 | c->recv_vpn_packet (pkt, rsi); |
266 | } |
556 | } |
267 | } |
557 | } |
268 | |
558 | |
269 | void |
559 | bool |
270 | vpn::udpv4_ev (io_watcher &w, short revents) |
560 | vpn::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
271 | { |
561 | { |
272 | if (revents & (POLLIN | POLLERR)) |
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 |
|
|
596 | vpn::ipv42_ev (ev::io &w, int revents) |
|
|
597 | { |
|
|
598 | if (revents & EV_READ) |
273 | { |
599 | { |
274 | vpn_packet *pkt = new vpn_packet; |
600 | vpn_packet *pkt = new vpn_packet; |
275 | struct sockaddr_in sa; |
601 | struct sockaddr_in sa; |
276 | socklen_t sa_len = sizeof (sa); |
602 | socklen_t sa_len = sizeof (sa); |
277 | int len; |
603 | int len; |
278 | |
604 | |
279 | 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); |
280 | |
606 | |
281 | sockinfo si(sa, PROT_UDPv4); |
607 | sockinfo si(sa, PROT_IPv42); |
282 | |
608 | |
283 | if (len > 0) |
609 | if (len > 0) |
284 | { |
610 | { |
285 | pkt->len = len; |
611 | pkt->len = len; |
286 | |
612 | |
|
|
613 | // raw sockets deliver the ipv4 header, but don't expect it on sends |
|
|
614 | pkt->skip_hdr (pkt->ipv4_hdr_len ()); |
|
|
615 | |
287 | recv_vpn_packet (pkt, si); |
616 | recv_vpn_packet (pkt, si); |
288 | } |
617 | } |
289 | else |
618 | else |
290 | { |
619 | { |
291 | // probably ECONNRESET or somesuch |
620 | // probably ECONNRESET or somesuch |
292 | slog (L_DEBUG, _("%s: fd %d, %s"), (const char *)si, w.fd, strerror (errno)); |
621 | slog (L_DEBUG, _("%s: %s."), (const char *)si, strerror (errno)); |
293 | } |
622 | } |
294 | |
623 | |
295 | delete pkt; |
624 | delete pkt; |
296 | } |
625 | } |
297 | else if (revents & POLLHUP) |
|
|
298 | { |
|
|
299 | // this cannot ;) happen on udp sockets |
|
|
300 | slog (L_ERR, _("FATAL: POLLHUP on udp v4 fd, terminating.")); |
|
|
301 | exit (1); |
|
|
302 | } |
|
|
303 | else |
626 | else |
304 | { |
627 | { |
305 | slog (L_ERR, |
628 | slog (L_ERR, |
306 | _("FATAL: unknown revents %08x in socket, terminating\n"), |
629 | _("FATAL: unknown revents %08x in socket, exiting.\n"), |
307 | revents); |
630 | revents); |
308 | exit (1); |
631 | exit (EXIT_FAILURE); |
309 | } |
632 | } |
310 | } |
633 | } |
|
|
634 | #endif |
311 | |
635 | |
312 | void |
636 | inline void |
313 | vpn::ipv4_ev (io_watcher &w, short revents) |
637 | vpn::ipv4_ev (ev::io &w, int revents) |
314 | { |
638 | { |
315 | if (revents & (POLLIN | POLLERR)) |
639 | if (revents & EV_READ) |
316 | { |
640 | { |
317 | vpn_packet *pkt = new vpn_packet; |
641 | vpn_packet *pkt = new vpn_packet; |
318 | struct sockaddr_in sa; |
642 | struct sockaddr_in sa; |
319 | socklen_t sa_len = sizeof (sa); |
643 | socklen_t sa_len = sizeof (sa); |
320 | int len; |
644 | int len; |
… | |
… | |
325 | |
649 | |
326 | if (len > 0) |
650 | if (len > 0) |
327 | { |
651 | { |
328 | pkt->len = len; |
652 | pkt->len = len; |
329 | |
653 | |
330 | // 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 |
331 | // this is slow, but... |
655 | pkt->skip_hdr (pkt->ipv4_hdr_len ()); |
332 | pkt->skip_hdr (IP_OVERHEAD); |
|
|
333 | |
656 | |
334 | recv_vpn_packet (pkt, si); |
657 | recv_vpn_packet (pkt, si); |
335 | } |
658 | } |
336 | else |
659 | else |
337 | { |
660 | { |
338 | // probably ECONNRESET or somesuch |
661 | // probably ECONNRESET or somesuch |
339 | slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno)); |
662 | slog (L_DEBUG, _("%s: %s."), (const char *)si, strerror (errno)); |
340 | } |
663 | } |
341 | |
664 | |
342 | delete pkt; |
665 | delete pkt; |
343 | } |
666 | } |
344 | else if (revents & POLLHUP) |
|
|
345 | { |
|
|
346 | // this cannot ;) happen on udp sockets |
|
|
347 | slog (L_ERR, _("FATAL: POLLHUP on ipv4 fd, terminating.")); |
|
|
348 | exit (1); |
|
|
349 | } |
|
|
350 | else |
667 | else |
351 | { |
668 | { |
352 | slog (L_ERR, |
669 | slog (L_ERR, |
|
|
670 | _("FATAL: unknown revents %08x in socket, exiting.\n"), |
|
|
671 | revents); |
|
|
672 | exit (EXIT_FAILURE); |
|
|
673 | } |
|
|
674 | } |
|
|
675 | |
|
|
676 | #if ENABLE_ICMP |
|
|
677 | inline void |
|
|
678 | vpn::icmpv4_ev (ev::io &w, int revents) |
|
|
679 | { |
|
|
680 | if (revents & EV_READ) |
|
|
681 | { |
|
|
682 | vpn_packet *pkt = new vpn_packet; |
|
|
683 | struct sockaddr_in sa; |
|
|
684 | socklen_t sa_len = sizeof (sa); |
|
|
685 | int len; |
|
|
686 | |
|
|
687 | len = recvfrom (w.fd, &((*pkt)[0]), MAXSIZE, 0, (sockaddr *)&sa, &sa_len); |
|
|
688 | |
|
|
689 | sockinfo si(sa, PROT_ICMPv4); |
|
|
690 | |
|
|
691 | if (len > 0) |
|
|
692 | { |
|
|
693 | pkt->len = len; |
|
|
694 | |
|
|
695 | icmp_header *hdr = (icmp_header *)&((*pkt)[IP_OVERHEAD]); |
|
|
696 | |
|
|
697 | if (hdr->type == ::conf.icmp_type |
|
|
698 | && hdr->code == 255) |
|
|
699 | { |
|
|
700 | // raw sockets deliver the ipv4, but don't expect it on sends |
|
|
701 | // this is slow, but... |
|
|
702 | pkt->skip_hdr (pkt->ipv4_hdr_len () + (ICMP_OVERHEAD - IP_OVERHEAD)); |
|
|
703 | |
|
|
704 | recv_vpn_packet (pkt, si); |
|
|
705 | } |
|
|
706 | } |
|
|
707 | else |
|
|
708 | { |
|
|
709 | // probably ECONNRESET or somesuch |
|
|
710 | slog (L_DEBUG, _("%s: %s."), (const char *)si, strerror (errno)); |
|
|
711 | } |
|
|
712 | |
|
|
713 | delete pkt; |
|
|
714 | } |
|
|
715 | else |
|
|
716 | { |
|
|
717 | slog (L_ERR, |
353 | _("FATAL: unknown revents %08x in socket, terminating\n"), |
718 | _("FATAL: unknown revents %08x in socket, exiting.\n"), |
354 | revents); |
719 | revents); |
355 | exit (1); |
720 | exit (EXIT_FAILURE); |
|
|
721 | } |
|
|
722 | } |
|
|
723 | #endif |
|
|
724 | |
|
|
725 | inline void |
|
|
726 | vpn::udpv4_ev (ev::io &w, int revents) |
|
|
727 | { |
|
|
728 | if (revents & EV_READ) |
356 | } |
729 | { |
357 | } |
730 | vpn_packet *pkt = new vpn_packet; |
|
|
731 | struct sockaddr_in sa; |
|
|
732 | socklen_t sa_len = sizeof (sa); |
|
|
733 | int len; |
358 | |
734 | |
359 | void |
735 | len = recvfrom (w.fd, &((*pkt)[0]), MAXSIZE, 0, (sockaddr *)&sa, &sa_len); |
|
|
736 | |
|
|
737 | sockinfo si(sa, PROT_UDPv4); |
|
|
738 | |
|
|
739 | if (len > 0) |
|
|
740 | { |
|
|
741 | pkt->len = len; |
|
|
742 | |
|
|
743 | recv_vpn_packet (pkt, si); |
|
|
744 | } |
|
|
745 | else |
|
|
746 | { |
|
|
747 | // probably ECONNRESET or somesuch |
|
|
748 | slog (L_DEBUG, _("%s: fd %d, %s."), (const char *)si, w.fd, strerror (errno)); |
|
|
749 | } |
|
|
750 | |
|
|
751 | delete pkt; |
|
|
752 | } |
|
|
753 | else |
|
|
754 | { |
|
|
755 | slog (L_ERR, |
|
|
756 | _("FATAL: unknown revents %08x in socket, exiting.\n"), |
|
|
757 | revents); |
|
|
758 | exit (EXIT_FAILURE); |
|
|
759 | } |
|
|
760 | } |
|
|
761 | |
|
|
762 | inline void |
360 | vpn::tap_ev (io_watcher &w, short revents) |
763 | vpn::tap_ev (ev::io &w, int revents) |
361 | { |
764 | { |
362 | if (revents & POLLIN) |
765 | if (revents & EV_READ) |
363 | { |
766 | { |
364 | /* process data */ |
767 | /* process data */ |
365 | tap_packet *pkt; |
768 | tap_packet *pkt; |
366 | |
769 | |
367 | pkt = tap->recv (); |
770 | pkt = tap->recv (); |
368 | |
771 | |
|
|
772 | if (!pkt) |
|
|
773 | return; |
|
|
774 | |
|
|
775 | if (pkt->len > 14) |
|
|
776 | { |
369 | int dst = mac2id (pkt->dst); |
777 | int dst = mac2id (pkt->dst); |
370 | int src = mac2id (pkt->src); |
778 | int src = mac2id (pkt->src); |
371 | |
779 | |
372 | if (src != THISNODE->id) |
780 | if (src != THISNODE->id) |
373 | { |
|
|
374 | slog (L_ERR, _("FATAL: tap packet not originating on current node received, terminating.")); |
|
|
375 | exit (1); |
|
|
376 | } |
|
|
377 | |
|
|
378 | if (dst == THISNODE->id) |
|
|
379 | { |
|
|
380 | slog (L_ERR, _("FATAL: tap packet destined for current node received, terminating.")); |
|
|
381 | exit (1); |
|
|
382 | } |
|
|
383 | |
|
|
384 | if (dst > conns.size ()) |
|
|
385 | slog (L_ERR, _("tap packet for unknown node %d received, ignoring."), dst); |
|
|
386 | else |
|
|
387 | { |
|
|
388 | if (dst) |
|
|
389 | { |
781 | { |
390 | // unicast |
782 | slog (L_ERR, _("FATAL: tap packet not originating on current node received (if-up script not working properly?), exiting.")); |
391 | if (dst != THISNODE->id) |
783 | exit (EXIT_FAILURE); |
392 | conns[dst - 1]->inject_data_packet (pkt); |
|
|
393 | } |
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); |
394 | else |
794 | else |
395 | { |
|
|
396 | // broadcast, first check router, then self, then english |
|
|
397 | connection *router = find_router (); |
|
|
398 | |
|
|
399 | if (router) |
|
|
400 | router->inject_data_packet (pkt, true); |
795 | inject_data_packet (pkt, dst); |
401 | else |
|
|
402 | for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c) |
|
|
403 | if ((*c)->conf != THISNODE) |
|
|
404 | (*c)->inject_data_packet (pkt); |
|
|
405 | } |
|
|
406 | } |
796 | } |
407 | |
797 | |
408 | delete pkt; |
798 | delete pkt; |
409 | } |
799 | } |
410 | else if (revents & (POLLHUP | POLLERR)) |
|
|
411 | { |
|
|
412 | slog (L_ERR, _("FATAL: POLLHUP or POLLERR on network device fd, terminating.")); |
|
|
413 | exit (1); |
|
|
414 | } |
|
|
415 | else |
800 | else |
416 | abort (); |
801 | abort (); |
417 | } |
802 | } |
418 | |
803 | |
419 | void |
804 | inline void |
420 | vpn::event_cb (time_watcher &w) |
805 | vpn::event_cb (ev::timer &w, int) |
421 | { |
806 | { |
422 | if (events) |
807 | if (events) |
423 | { |
808 | { |
424 | if (events & EVENT_SHUTDOWN) |
809 | if (events & EVENT_SHUTDOWN) |
425 | { |
810 | { |
426 | slog (L_INFO, _("preparing shutdown...")); |
811 | slog (L_INFO, _("preparing shutdown...")); |
427 | |
812 | |
428 | shutdown_all (); |
813 | shutdown_all (); |
429 | |
|
|
430 | remove_pid (pidfilename); |
814 | remove_pid (conf.pidfilename); |
431 | |
|
|
432 | slog (L_INFO, _("terminating")); |
815 | slog (L_INFO, _("exiting.")); |
433 | |
816 | exit (EXIT_SUCCESS); |
434 | exit (0); |
|
|
435 | } |
817 | } |
436 | |
818 | |
437 | if (events & EVENT_RECONNECT) |
819 | if (events & EVENT_RECONNECT) |
438 | { |
820 | { |
439 | slog (L_INFO, _("forced reconnect")); |
821 | slog (L_INFO, _("forced reconnect.")); |
440 | |
822 | |
441 | reconnect_all (); |
823 | reconnect_all (); |
442 | } |
824 | } |
443 | |
825 | |
444 | events = 0; |
826 | events = 0; |
445 | } |
827 | } |
446 | |
|
|
447 | w.at = TSTAMP_CANCEL; |
|
|
448 | } |
828 | } |
449 | |
829 | |
450 | void |
830 | void |
451 | vpn::shutdown_all () |
831 | vpn::shutdown_all () |
452 | { |
832 | { |
… | |
… | |
462 | |
842 | |
463 | conns.clear (); |
843 | conns.clear (); |
464 | |
844 | |
465 | connection_init (); |
845 | connection_init (); |
466 | |
846 | |
467 | for (configuration::node_vector::iterator i = conf.nodes.begin (); |
847 | for (configuration::node_vector::iterator i = conf.nodes.begin (); i != conf.nodes.end (); ++i) |
468 | i != conf.nodes.end (); ++i) |
848 | conns.push_back (new connection (this, *i)); |
469 | { |
|
|
470 | connection *conn = new connection (this); |
|
|
471 | |
849 | |
472 | conn->conf = *i; |
850 | for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c) |
473 | conns.push_back (conn); |
|
|
474 | |
|
|
475 | conn->establish_connection (); |
851 | (*c)->establish_connection (); |
476 | } |
|
|
477 | } |
852 | } |
478 | |
853 | |
479 | connection *vpn::find_router () |
854 | bool |
|
|
855 | vpn::can_direct (conf_node *src, conf_node *dst) const |
480 | { |
856 | { |
481 | u32 prio = 0; |
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 | { |
482 | connection *router = 0; |
869 | connection *router = 0; |
483 | |
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 | { |
484 | for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i) |
919 | for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i) |
485 | { |
920 | { |
486 | connection *c = *i; |
921 | connection *o = *i; |
487 | |
922 | |
488 | if (c->conf->routerprio > prio |
923 | if (!o->is_direct |
489 | && c->connectmode == conf_node::C_ALWAYS |
924 | && o->si.valid () |
490 | && c->conf != THISNODE |
925 | && c->si != o->si |
491 | && c->ictx && c->octx) |
926 | && c == find_router_for (o)) |
492 | { |
|
|
493 | prio = c->conf->routerprio; |
|
|
494 | router = c; |
|
|
495 | } |
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 | } |
496 | } |
932 | } |
497 | |
|
|
498 | return router; |
|
|
499 | } |
933 | } |
500 | |
934 | |
501 | void vpn::connect_request (int id) |
935 | void |
|
|
936 | vpn::send_connect_request (connection *c) |
502 | { |
937 | { |
503 | connection *c = find_router (); |
938 | connection *r = find_router_for (c); |
504 | |
939 | |
505 | 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); |
506 | c->connect_request (id); |
944 | r->send_connect_request (c->conf->id); |
507 | //else // does not work, because all others must connect to the same router |
945 | } |
508 | // // no router found, aggressively connect to all routers |
946 | else |
509 | // for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i) |
947 | slog (L_DEBUG, _("%s: no way to connect and no router found: unable to connect at this time."), |
510 | // if ((*i)->conf->routerprio) |
948 | c->conf->nodename); |
511 | // (*i)->establish_connection (); |
|
|
512 | } |
949 | } |
513 | |
950 | |
514 | void |
951 | void |
515 | connection::dump_status () |
952 | connection::dump_status () |
516 | { |
953 | { |
517 | slog (L_NOTICE, _("node %s (id %d)"), conf->nodename, conf->id); |
954 | slog (L_NOTICE, _("node %s (id %d)"), conf->nodename, conf->id); |
518 | slog (L_NOTICE, _(" connectmode %d (%d) / sockaddr %s / minor %d"), |
955 | slog (L_NOTICE, _(" connectmode %d (%d) / sockaddr %s / minor %d"), |
519 | connectmode, conf->connectmode, (const char *)si, (int)prot_minor); |
956 | connectmode, conf->connectmode, (const char *)si, (int)prot_minor); |
520 | 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"), |
521 | (long)ictx, (long)octx, (int)oseqno, (int)retry_cnt); |
958 | (long)ictx, (long)octx, (int)oseqno, (int)retry_cnt); |
522 | slog (L_NOTICE, _(" establish_conn %ld / rekey %ld / keepalive %ld"), |
|
|
523 | (long)(establish_connection.at), (long)(rekey.at), (long)(keepalive.at)); |
|
|
524 | } |
959 | } |
525 | |
960 | |
526 | void |
961 | void |
527 | vpn::dump_status () |
962 | vpn::dump_status () |
528 | { |
963 | { |
529 | slog (L_NOTICE, _("BEGIN status dump (%ld)"), (long)NOW); |
964 | slog (L_NOTICE, _("BEGIN status dump (%ld)"), (long)ev_now ()); |
530 | |
965 | |
531 | for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c) |
966 | for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c) |
532 | (*c)->dump_status (); |
967 | (*c)->dump_status (); |
533 | |
968 | |
534 | slog (L_NOTICE, _("END status dump")); |
969 | slog (L_NOTICE, _("END status dump")); |
535 | } |
970 | } |
536 | |
971 | |
537 | vpn::vpn (void) |
972 | vpn::vpn (void) |
538 | : event(this, &vpn::event_cb) |
973 | { |
|
|
974 | event .set<vpn, &vpn::event_cb > (this); |
539 | , udpv4_ev_watcher(this, &vpn::udpv4_ev) |
975 | udpv4_ev_watcher .set<vpn, &vpn::udpv4_ev > (this); |
540 | , ipv4_ev_watcher (this, &vpn::ipv4_ev) |
976 | ipv4_ev_watcher .set<vpn, &vpn::ipv4_ev > (this); |
541 | , tap_ev_watcher (this, &vpn::tap_ev) |
977 | #if 1//D2 |
|
|
978 | ipv42_ev_watcher .set<vpn, &vpn::ipv42_ev > (this); |
|
|
979 | #endif |
542 | #if ENABLE_TCP |
980 | #if ENABLE_TCP |
543 | , tcpv4_ev_watcher(this, &vpn::tcpv4_ev) |
981 | tcpv4_ev_watcher .set<vpn, &vpn::tcpv4_ev > (this); |
544 | #endif |
982 | #endif |
545 | { |
983 | #if ENABLE_ICMP |
|
|
984 | icmpv4_ev_watcher.set<vpn, &vpn::icmpv4_ev> (this); |
|
|
985 | #endif |
|
|
986 | #if ENABLE_DNS |
|
|
987 | dnsv4_ev_watcher .set<vpn, &vpn::dnsv4_ev > (this); |
|
|
988 | #endif |
|
|
989 | tap_ev_watcher .set<vpn, &vpn::tap_ev > (this); |
546 | } |
990 | } |
547 | |
991 | |
548 | vpn::~vpn () |
992 | vpn::~vpn () |
549 | { |
993 | { |
550 | } |
994 | } |