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 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 | ipv4_tos = -1; |
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153 | ipv4_fd = -1; |
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154 | |
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155 | if (THISNODE->protocols & PROT_IPv4 && ::conf.ip_proto) |
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156 | { |
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157 | ipv4_fd = setup_socket (PROT_IPv4, PF_INET, SOCK_RAW, ::conf.ip_proto); |
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158 | |
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159 | if (ipv4_fd < 0) |
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160 | return -1; |
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161 | |
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162 | #if defined(SOL_IP) && defined(IP_MTU_DISCOVER) |
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163 | // this I really consider a linux bug. I am neither connected |
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164 | // nor do I fragment myself. Linux still sets DF and doesn't |
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165 | // fragment for me sometimes. |
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166 | { |
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167 | int oval = IP_PMTUDISC_DONT; |
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168 | setsockopt (ipv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval); |
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169 | } |
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170 | #endif |
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171 | |
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172 | sockinfo si (THISNODE, PROT_IPv4); |
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173 | |
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174 | if (bind (ipv4_fd, si.sav4 (), si.salenv4 ())) |
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175 | { |
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176 | slog (L_ERR, _("can't bind ipv4 socket on %s: %s, exiting."), (const char *)si, strerror (errno)); |
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177 | return -1; |
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178 | } |
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179 | |
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180 | ipv4_ev_watcher.start (ipv4_fd, EV_READ); |
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181 | ++success; |
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182 | } |
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183 | else |
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184 | THISNODE->protocols &= ~PROT_IPv4; |
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185 | |
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186 | udpv4_tos = -1; |
76 | udpv4_fd = -1; |
187 | udpv4_fd = -1; |
77 | |
188 | |
78 | if (THISNODE->protocols & PROT_UDPv4) |
189 | if (THISNODE->protocols & PROT_UDPv4 && THISNODE->udp_port) |
79 | { |
190 | { |
80 | udpv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP); |
191 | udpv4_fd = setup_socket (PROT_UDPv4, PF_INET, SOCK_DGRAM, IPPROTO_UDP); |
81 | |
192 | |
82 | if (udpv4_fd < 0) |
193 | if (udpv4_fd < 0) |
83 | return -1; |
194 | return -1; |
84 | |
195 | |
85 | // standard daemon practise... |
196 | // standard daemon practise... |
86 | { |
197 | { |
87 | int oval = 1; |
198 | int oval = 1; |
88 | setsockopt (udpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval); |
199 | setsockopt (udpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval); |
89 | } |
200 | } |
90 | |
201 | |
91 | sockinfo si (THISNODE, PROT_UDPv4); |
202 | #if defined(SOL_IP) && defined(IP_MTU_DISCOVER) |
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 |
203 | // this I really consider a linux bug. I am neither connected |
101 | // nor do I fragment myself. Linux still sets DF and doesn't |
204 | // nor do I fragment myself. Linux still sets DF and doesn't |
102 | // fragment for me sometimes. |
205 | // fragment for me sometimes. |
103 | { |
206 | { |
104 | int oval = IP_PMTUDISC_DONT; |
207 | int oval = IP_PMTUDISC_DONT; |
105 | setsockopt (udpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval); |
208 | setsockopt (udpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval); |
106 | } |
209 | } |
107 | #endif |
210 | #endif |
108 | |
211 | |
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212 | sockinfo si (THISNODE, PROT_UDPv4); |
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213 | |
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214 | if (bind (udpv4_fd, si.sav4 (), si.salenv4 ())) |
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215 | { |
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216 | slog (L_ERR, _("can't bind udpv4 on %s: %s, exiting."), (const char *)si, strerror (errno)); |
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217 | return -1; |
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218 | } |
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219 | |
109 | udpv4_ev_watcher.start (udpv4_fd, POLLIN); |
220 | udpv4_ev_watcher.start (udpv4_fd, EV_READ); |
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221 | ++success; |
110 | } |
222 | } |
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223 | else |
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224 | THISNODE->protocols &= ~PROT_UDPv4; |
111 | |
225 | |
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226 | icmpv4_tos = -1; |
112 | ipv4_fd = -1; |
227 | icmpv4_fd = -1; |
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228 | |
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229 | #if ENABLE_ICMP |
113 | if (THISNODE->protocols & PROT_IPv4) |
230 | if (THISNODE->protocols & PROT_ICMPv4) |
114 | { |
231 | { |
115 | ipv4_fd = socket (PF_INET, SOCK_RAW, ::conf.ip_proto); |
232 | icmpv4_fd = setup_socket (PROT_ICMPv4, PF_INET, SOCK_RAW, IPPROTO_ICMP); |
116 | |
233 | |
117 | if (ipv4_fd < 0) |
234 | if (icmpv4_fd < 0) |
118 | return -1; |
235 | return -1; |
119 | |
236 | |
120 | sockinfo si (THISNODE, PROT_IPv4); |
237 | #ifdef ICMP_FILTER |
121 | |
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122 | if (bind (ipv4_fd, si.sav4 (), si.salenv4 ())) |
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123 | { |
238 | { |
124 | slog (L_ERR, _("can't bind ipv4 socket on %s: %s"), (const char *)si, strerror (errno)); |
239 | icmp_filter oval; |
125 | exit (1); |
240 | oval.data = 0xffffffff; |
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241 | if (::conf.icmp_type < 32) |
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242 | oval.data &= ~(1 << ::conf.icmp_type); |
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243 | |
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244 | setsockopt (icmpv4_fd, SOL_RAW, ICMP_FILTER, &oval, sizeof oval); |
126 | } |
245 | } |
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246 | #endif |
127 | |
247 | |
128 | #ifdef IP_MTU_DISCOVER |
248 | #if defined(SOL_IP) && defined(IP_MTU_DISCOVER) |
129 | // this I really consider a linux bug. I am neither connected |
249 | // this I really consider a linux bug. I am neither connected |
130 | // nor do I fragment myself. Linux still sets DF and doesn't |
250 | // nor do I fragment myself. Linux still sets DF and doesn't |
131 | // fragment for me sometimes. |
251 | // fragment for me sometimes. |
132 | { |
252 | { |
133 | int oval = IP_PMTUDISC_DONT; |
253 | int oval = IP_PMTUDISC_DONT; |
134 | setsockopt (ipv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval); |
254 | setsockopt (icmpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval); |
135 | } |
255 | } |
136 | #endif |
256 | #endif |
137 | |
257 | |
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258 | sockinfo si (THISNODE, PROT_ICMPv4); |
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259 | |
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260 | if (bind (icmpv4_fd, si.sav4 (), si.salenv4 ())) |
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261 | { |
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262 | slog (L_ERR, _("can't bind icmpv4 on %s: %s, exiting."), (const char *)si, strerror (errno)); |
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263 | return -1; |
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264 | } |
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265 | |
138 | ipv4_ev_watcher.start (ipv4_fd, POLLIN); |
266 | icmpv4_ev_watcher.start (icmpv4_fd, EV_READ); |
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267 | ++success; |
139 | } |
268 | } |
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269 | #endif |
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270 | |
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271 | tcpv4_fd = -1; |
140 | |
272 | |
141 | #if ENABLE_TCP |
273 | #if ENABLE_TCP |
142 | if (THISNODE->protocols & PROT_TCPv4) |
274 | if (THISNODE->protocols & PROT_TCPv4 && THISNODE->tcp_port) |
143 | { |
275 | { |
144 | tcpv4_fd = socket (PF_INET, SOCK_STREAM, IPPROTO_TCP); |
276 | tcpv4_fd = setup_socket (PROT_TCPv4, PF_INET, SOCK_STREAM, IPPROTO_TCP); |
145 | |
277 | |
146 | if (tcpv4_fd < 0) |
278 | if (tcpv4_fd < 0) |
147 | return -1; |
279 | return -1; |
148 | |
280 | |
149 | // standard daemon practise... |
281 | // standard daemon practise... |
… | |
… | |
154 | |
286 | |
155 | sockinfo si (THISNODE, PROT_TCPv4); |
287 | sockinfo si (THISNODE, PROT_TCPv4); |
156 | |
288 | |
157 | if (bind (tcpv4_fd, si.sav4 (), si.salenv4 ())) |
289 | if (bind (tcpv4_fd, si.sav4 (), si.salenv4 ())) |
158 | { |
290 | { |
159 | slog (L_ERR, _("can't bind tcpv4 on %s: %s"), (const char *)si, strerror (errno)); |
291 | slog (L_ERR, _("can't bind tcpv4 on %s: %s, exiting."), (const char *)si, strerror (errno)); |
160 | exit (1); |
292 | return -1; |
161 | } |
293 | } |
162 | |
294 | |
163 | if (listen (tcpv4_fd, 5)) |
295 | if (listen (tcpv4_fd, 5)) |
164 | { |
296 | { |
165 | slog (L_ERR, _("can't listen tcpv4 on %s: %s"), (const char *)si, strerror (errno)); |
297 | slog (L_ERR, _("can't listen tcpv4 on %s: %s, exiting."), (const char *)si, strerror (errno)); |
166 | exit (1); |
298 | return -1; |
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299 | } |
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300 | |
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301 | tcpv4_ev_watcher.start (tcpv4_fd, EV_READ); |
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302 | ++success; |
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303 | } |
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304 | else |
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305 | THISNODE->protocols &= ~PROT_TCPv4; |
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306 | #endif |
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307 | |
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308 | dnsv4_tos = -1; |
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309 | dnsv4_fd = -1; |
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310 | |
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311 | #if ENABLE_DNS |
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312 | if (THISNODE->protocols & PROT_DNSv4) |
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313 | { |
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314 | dns_forwarder.set (::conf.dns_forw_host, ::conf.dns_forw_port, PROT_DNSv4); |
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315 | |
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316 | dnsv4_fd = setup_socket (PROT_DNSv4, PF_INET, SOCK_DGRAM, IPPROTO_UDP); |
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317 | |
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318 | if (dnsv4_fd < 0) |
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319 | return -1; |
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320 | |
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321 | # if defined(SOL_IP) && defined(IP_MTU_DISCOVER) |
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322 | // this I really consider a linux bug. I am neither connected |
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323 | // nor do I fragment myself. Linux still sets DF and doesn't |
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324 | // fragment for me sometimes. |
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325 | { |
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326 | int oval = IP_PMTUDISC_DONT; |
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327 | setsockopt (dnsv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval); |
167 | } |
328 | } |
168 | |
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169 | tcpv4_ev_watcher.start (tcpv4_fd, POLLIN); |
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170 | } |
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171 | #endif |
329 | # endif |
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330 | |
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331 | // standard daemon practise... |
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332 | { |
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333 | int oval = 1; |
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334 | setsockopt (dnsv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval); |
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335 | } |
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336 | |
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337 | sockinfo si (THISNODE->dns_hostname, |
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338 | THISNODE->dns_hostname ? THISNODE->dns_port : 0, |
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339 | PROT_DNSv4); |
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340 | |
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341 | if (bind (dnsv4_fd, si.sav4 (), si.salenv4 ())) |
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342 | { |
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343 | slog (L_ERR, _("can't bind dnsv4 on %s: %s, exiting."), (const char *)si, strerror (errno)); |
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344 | return -1; |
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345 | } |
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346 | |
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347 | dnsv4_ev_watcher.start (dnsv4_fd, EV_READ); |
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348 | ++success; |
|
|
349 | } |
|
|
350 | #endif |
|
|
351 | |
|
|
352 | ///////////////////////////////////////////////////////////////////////////// |
|
|
353 | |
|
|
354 | if (!success) |
|
|
355 | { |
|
|
356 | slog (L_ERR, _("no protocols enabled.")); |
|
|
357 | return -1; |
|
|
358 | } |
|
|
359 | |
|
|
360 | reconnect_all (); |
|
|
361 | |
|
|
362 | ///////////////////////////////////////////////////////////////////////////// |
172 | |
363 | |
173 | tap = new tap_device (); |
364 | tap = new tap_device (); |
174 | if (!tap) //D this, of course, never catches |
365 | if (!tap) //D this, of course, never catches |
175 | { |
366 | { |
176 | slog (L_ERR, _("cannot create network interface '%s'"), conf.ifname); |
367 | slog (L_ERR, _("cannot create network interface '%s'."), conf.ifname); |
177 | exit (1); |
368 | return -1; |
178 | } |
369 | } |
179 | |
370 | |
180 | run_script (run_script_cb (this, &vpn::script_if_up), true); |
371 | fcntl (tap->fd, F_SETFD, FD_CLOEXEC); |
181 | |
372 | |
|
|
373 | run_script_cb cb; |
|
|
374 | cb.set<vpn, &vpn::script_if_init> (this); |
|
|
375 | |
|
|
376 | if (tap->if_up () && |
|
|
377 | !run_script (cb, true)) |
|
|
378 | { |
|
|
379 | slog (L_ERR, _("interface initialization command '%s' failed."), |
|
|
380 | tap->if_up ()); |
|
|
381 | return -1; |
|
|
382 | } |
|
|
383 | |
|
|
384 | cb.set<vpn, &vpn::script_if_up> (this); |
|
|
385 | if (!run_script (cb, true)) |
|
|
386 | { |
|
|
387 | slog (L_ERR, _("if-up command execution failed.")); |
|
|
388 | return -1; |
|
|
389 | } |
|
|
390 | |
182 | tap_ev_watcher.start (tap->fd, POLLIN); |
391 | tap_ev_watcher.start (tap->fd, EV_READ); |
183 | |
|
|
184 | reconnect_all (); |
|
|
185 | |
392 | |
186 | return 0; |
393 | return 0; |
187 | } |
394 | } |
188 | |
395 | |
189 | // send a vpn packet out to other hosts |
396 | bool |
|
|
397 | vpn::send_ipv4_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
|
|
398 | { |
|
|
399 | set_tos (ipv4_fd, ipv4_tos, tos); |
|
|
400 | sendto (ipv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ()); |
|
|
401 | |
|
|
402 | return true; |
|
|
403 | } |
|
|
404 | |
|
|
405 | static u16 |
|
|
406 | ipv4_checksum (u16 *data, unsigned int len) |
|
|
407 | { |
|
|
408 | // use 32 bit accumulator and fold back carry bits at the end |
|
|
409 | u32 sum = 0; |
|
|
410 | |
|
|
411 | while (len > 1) |
|
|
412 | { |
|
|
413 | sum += *data++; |
|
|
414 | len -= 2; |
|
|
415 | } |
|
|
416 | |
|
|
417 | // odd byte left? |
|
|
418 | if (len) |
|
|
419 | sum += *(u8 *)data; |
|
|
420 | |
|
|
421 | // add back carry bits |
|
|
422 | sum = (sum >> 16) + (sum & 0xffff); // lo += hi |
|
|
423 | sum += (sum >> 16); // carry |
|
|
424 | |
|
|
425 | return ~sum; |
|
|
426 | } |
|
|
427 | |
|
|
428 | #if ENABLE_ICMP |
|
|
429 | bool |
|
|
430 | vpn::send_icmpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
|
|
431 | { |
|
|
432 | pkt->unshift_hdr (4); |
|
|
433 | |
|
|
434 | icmp_header *hdr = (icmp_header *)&((*pkt)[0]); |
|
|
435 | hdr->type = ::conf.icmp_type; |
|
|
436 | hdr->code = 255; |
|
|
437 | hdr->checksum = 0; |
|
|
438 | hdr->checksum = ipv4_checksum ((u16 *)hdr, pkt->len); |
|
|
439 | |
|
|
440 | set_tos (icmpv4_fd, icmpv4_tos, tos); |
|
|
441 | sendto (icmpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ()); |
|
|
442 | |
|
|
443 | return true; |
|
|
444 | } |
|
|
445 | #endif |
|
|
446 | |
|
|
447 | bool |
|
|
448 | vpn::send_udpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
|
|
449 | { |
|
|
450 | set_tos (udpv4_fd, udpv4_tos, tos); |
|
|
451 | sendto (udpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ()); |
|
|
452 | |
|
|
453 | return true; |
|
|
454 | } |
|
|
455 | |
190 | void |
456 | void |
191 | vpn::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
457 | vpn::inject_data_packet (tap_packet *pkt, int dst) |
192 | { |
458 | { |
193 | switch (si.prot) |
459 | 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 | } |
460 | { |
213 | } |
461 | // unicast |
214 | |
462 | if (dst != THISNODE->id) |
215 | void |
463 | conns[dst - 1]->inject_data_packet (pkt); |
216 | vpn::send_ipv4_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
464 | } |
217 | { |
465 | else |
218 | setsockopt (ipv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos); |
466 | { |
219 | sendto (ipv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ()); |
467 | // broadcast, this is ugly, but due to the security policy |
220 | } |
468 | // we have to connect to all hosts... |
221 | |
469 | for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c) |
222 | void |
470 | if ((*c)->conf != THISNODE) |
223 | vpn::send_udpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
471 | (*c)->inject_data_packet (pkt); |
224 | { |
472 | } |
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 | } |
473 | } |
228 | |
474 | |
229 | void |
475 | void |
230 | vpn::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi) |
476 | vpn::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi) |
231 | { |
477 | { |
232 | unsigned int src = pkt->src (); |
478 | unsigned int src = pkt->src (); |
233 | unsigned int dst = pkt->dst (); |
479 | unsigned int dst = pkt->dst (); |
234 | |
480 | |
235 | slog (L_NOISE, _("<<?/%s received possible vpn packet type %d from %d to %d, length %d"), |
481 | 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); |
482 | (const char *)rsi, pkt->typ (), pkt->src (), pkt->dst (), pkt->len); |
237 | |
483 | |
238 | if (src == 0 || src > conns.size () |
484 | if (src == 0 || src > conns.size () |
239 | || dst > conns.size () |
485 | || dst > conns.size () |
240 | || pkt->typ () >= vpn_packet::PT_MAX) |
486 | || pkt->typ () >= vpn_packet::PT_MAX) |
241 | slog (L_WARN, _("(%s): received corrupted packet type %d (src %d, dst %d)"), |
487 | slog (L_WARN, _("(%s): received corrupted packet type %d (src %d, dst %d)."), |
|
|
488 | (const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ()); |
|
|
489 | else if (dst > conns.size ()) |
|
|
490 | slog (L_WARN, _("(%s): received corrupted packet type %d (src %d, dst %d)."), |
242 | (const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ()); |
491 | (const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ()); |
243 | else |
492 | else |
244 | { |
493 | { |
245 | connection *c = conns[src - 1]; |
494 | connection *c = conns[src - 1]; |
246 | |
495 | |
247 | if (dst == 0 && !THISNODE->routerprio) |
496 | if (dst == 0) |
248 | slog (L_WARN, _("%s(%s): received broadcast, but we are no router"), |
497 | slog (L_WARN, _("%s(%s): received broadcast (protocol violation)."), |
249 | c->conf->nodename, (const char *)rsi); |
498 | c->conf->nodename, (const char *)rsi); |
250 | else if (dst != 0 && dst != THISNODE->id) |
499 | else if (dst != THISNODE->id) |
251 | // FORWARDING NEEDED ;) |
500 | { |
|
|
501 | if (THISNODE->routerprio) |
|
|
502 | // the tos setting gets lost here. who cares. |
|
|
503 | conns[dst - 1]->inject_vpn_packet (pkt); |
|
|
504 | else |
252 | slog (L_WARN, |
505 | slog (L_WARN, |
253 | _("received frame for node %d ('%s') from %s, but this is node %d ('%s')"), |
506 | _("%s(%s): request to forward packet to %s, but we are no router (config mismatch?)."), |
|
|
507 | c->conf->nodename, (const char *)rsi, |
254 | dst, conns[dst - 1]->conf->nodename, |
508 | conns[dst - 1]->conf->nodename); |
255 | (const char *)rsi, |
509 | } |
256 | THISNODE->id, THISNODE->nodename); |
|
|
257 | else |
510 | else |
258 | c->recv_vpn_packet (pkt, rsi); |
511 | c->recv_vpn_packet (pkt, rsi); |
259 | } |
512 | } |
260 | } |
513 | } |
261 | |
514 | |
262 | void |
515 | bool |
263 | vpn::udpv4_ev (io_watcher &w, short revents) |
516 | vpn::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
264 | { |
517 | { |
265 | if (revents & (POLLIN | POLLERR)) |
518 | switch (si.prot) |
|
|
519 | { |
|
|
520 | case PROT_IPv4: |
|
|
521 | return send_ipv4_packet (pkt, si, tos); |
|
|
522 | |
|
|
523 | case PROT_UDPv4: |
|
|
524 | return send_udpv4_packet (pkt, si, tos); |
|
|
525 | |
|
|
526 | #if ENABLE_TCP |
|
|
527 | case PROT_TCPv4: |
|
|
528 | return send_tcpv4_packet (pkt, si, tos); |
|
|
529 | #endif |
|
|
530 | #if ENABLE_ICMP |
|
|
531 | case PROT_ICMPv4: |
|
|
532 | return send_icmpv4_packet (pkt, si, tos); |
|
|
533 | #endif |
|
|
534 | #if ENABLE_DNS |
|
|
535 | case PROT_DNSv4: |
|
|
536 | return send_dnsv4_packet (pkt, si, tos); |
|
|
537 | #endif |
|
|
538 | default: |
|
|
539 | slog (L_CRIT, _("%s: FATAL: trying to send packet with unsupported protocol."), (const char *)si); |
|
|
540 | } |
|
|
541 | |
|
|
542 | return false; |
|
|
543 | } |
|
|
544 | |
|
|
545 | inline void |
|
|
546 | vpn::ipv4_ev (ev::io &w, int revents) |
|
|
547 | { |
|
|
548 | if (revents & EV_READ) |
266 | { |
549 | { |
267 | vpn_packet *pkt = new vpn_packet; |
550 | vpn_packet *pkt = new vpn_packet; |
268 | struct sockaddr_in sa; |
551 | struct sockaddr_in sa; |
269 | socklen_t sa_len = sizeof (sa); |
552 | socklen_t sa_len = sizeof (sa); |
270 | int len; |
553 | int len; |
271 | |
554 | |
272 | len = recvfrom (w.fd, &((*pkt)[0]), MAXSIZE, 0, (sockaddr *)&sa, &sa_len); |
555 | len = recvfrom (w.fd, &((*pkt)[0]), MAXSIZE, 0, (sockaddr *)&sa, &sa_len); |
273 | |
556 | |
274 | sockinfo si(sa, PROT_UDPv4); |
557 | sockinfo si(sa, PROT_IPv4); |
275 | |
558 | |
276 | if (len > 0) |
559 | if (len > 0) |
277 | { |
560 | { |
278 | pkt->len = len; |
561 | pkt->len = len; |
279 | |
562 | |
|
|
563 | // raw sockets deliver the ipv4 header, but don't expect it on sends |
|
|
564 | pkt->skip_hdr (IP_OVERHEAD); |
|
|
565 | |
280 | recv_vpn_packet (pkt, si); |
566 | recv_vpn_packet (pkt, si); |
281 | } |
567 | } |
282 | else |
568 | else |
283 | { |
569 | { |
284 | // probably ECONNRESET or somesuch |
570 | // probably ECONNRESET or somesuch |
285 | slog (L_DEBUG, _("%s: fd %d, %s"), (const char *)si, w.fd, strerror (errno)); |
571 | slog (L_DEBUG, _("%s: %s."), (const char *)si, strerror (errno)); |
286 | } |
572 | } |
287 | |
573 | |
288 | delete pkt; |
574 | delete pkt; |
289 | } |
575 | } |
290 | else if (revents & POLLHUP) |
|
|
291 | { |
|
|
292 | // this cannot ;) happen on udp sockets |
|
|
293 | slog (L_ERR, _("FATAL: POLLHUP on udp v4 fd, terminating.")); |
|
|
294 | exit (1); |
|
|
295 | } |
|
|
296 | else |
576 | else |
297 | { |
577 | { |
298 | slog (L_ERR, |
578 | slog (L_ERR, |
299 | _("FATAL: unknown revents %08x in socket, terminating\n"), |
579 | _("FATAL: unknown revents %08x in socket, exiting.\n"), |
300 | revents); |
580 | revents); |
301 | exit (1); |
581 | exit (EXIT_FAILURE); |
302 | } |
582 | } |
303 | } |
583 | } |
304 | |
584 | |
305 | void |
585 | #if ENABLE_ICMP |
|
|
586 | inline void |
306 | vpn::ipv4_ev (io_watcher &w, short revents) |
587 | vpn::icmpv4_ev (ev::io &w, int revents) |
307 | { |
588 | { |
308 | if (revents & (POLLIN | POLLERR)) |
589 | if (revents & EV_READ) |
309 | { |
590 | { |
310 | vpn_packet *pkt = new vpn_packet; |
591 | vpn_packet *pkt = new vpn_packet; |
311 | struct sockaddr_in sa; |
592 | struct sockaddr_in sa; |
312 | socklen_t sa_len = sizeof (sa); |
593 | socklen_t sa_len = sizeof (sa); |
313 | int len; |
594 | int len; |
314 | |
595 | |
315 | len = recvfrom (w.fd, &((*pkt)[0]), MAXSIZE, 0, (sockaddr *)&sa, &sa_len); |
596 | len = recvfrom (w.fd, &((*pkt)[0]), MAXSIZE, 0, (sockaddr *)&sa, &sa_len); |
316 | |
597 | |
317 | sockinfo si(sa, PROT_IPv4); |
598 | sockinfo si(sa, PROT_ICMPv4); |
318 | |
599 | |
319 | if (len > 0) |
600 | if (len > 0) |
320 | { |
601 | { |
321 | pkt->len = len; |
602 | pkt->len = len; |
322 | |
603 | |
|
|
604 | icmp_header *hdr = (icmp_header *)&((*pkt)[IP_OVERHEAD]); |
|
|
605 | |
|
|
606 | if (hdr->type == ::conf.icmp_type |
|
|
607 | && hdr->code == 255) |
|
|
608 | { |
323 | // raw sockets deliver the ipv4, but don't expect it on sends |
609 | // raw sockets deliver the ipv4, but don't expect it on sends |
324 | // this is slow, but... |
610 | // this is slow, but... |
325 | pkt->skip_hdr (IP_OVERHEAD); |
611 | pkt->skip_hdr (ICMP_OVERHEAD); |
|
|
612 | |
|
|
613 | recv_vpn_packet (pkt, si); |
|
|
614 | } |
|
|
615 | } |
|
|
616 | else |
|
|
617 | { |
|
|
618 | // probably ECONNRESET or somesuch |
|
|
619 | slog (L_DEBUG, _("%s: %s."), (const char *)si, strerror (errno)); |
|
|
620 | } |
|
|
621 | |
|
|
622 | delete pkt; |
|
|
623 | } |
|
|
624 | else |
|
|
625 | { |
|
|
626 | slog (L_ERR, |
|
|
627 | _("FATAL: unknown revents %08x in socket, exiting.\n"), |
|
|
628 | revents); |
|
|
629 | exit (EXIT_FAILURE); |
|
|
630 | } |
|
|
631 | } |
|
|
632 | #endif |
|
|
633 | |
|
|
634 | inline void |
|
|
635 | vpn::udpv4_ev (ev::io &w, int revents) |
|
|
636 | { |
|
|
637 | if (revents & EV_READ) |
|
|
638 | { |
|
|
639 | vpn_packet *pkt = new vpn_packet; |
|
|
640 | struct sockaddr_in sa; |
|
|
641 | socklen_t sa_len = sizeof (sa); |
|
|
642 | int len; |
|
|
643 | |
|
|
644 | len = recvfrom (w.fd, &((*pkt)[0]), MAXSIZE, 0, (sockaddr *)&sa, &sa_len); |
|
|
645 | |
|
|
646 | sockinfo si(sa, PROT_UDPv4); |
|
|
647 | |
|
|
648 | if (len > 0) |
|
|
649 | { |
|
|
650 | pkt->len = len; |
326 | |
651 | |
327 | recv_vpn_packet (pkt, si); |
652 | recv_vpn_packet (pkt, si); |
328 | } |
653 | } |
329 | else |
654 | else |
330 | { |
655 | { |
331 | // probably ECONNRESET or somesuch |
656 | // probably ECONNRESET or somesuch |
332 | slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno)); |
657 | slog (L_DEBUG, _("%s: fd %d, %s."), (const char *)si, w.fd, strerror (errno)); |
333 | } |
658 | } |
334 | |
659 | |
335 | delete pkt; |
660 | delete pkt; |
336 | } |
661 | } |
337 | else if (revents & POLLHUP) |
|
|
338 | { |
|
|
339 | // this cannot ;) happen on udp sockets |
|
|
340 | slog (L_ERR, _("FATAL: POLLHUP on ipv4 fd, terminating.")); |
|
|
341 | exit (1); |
|
|
342 | } |
|
|
343 | else |
662 | else |
344 | { |
663 | { |
345 | slog (L_ERR, |
664 | slog (L_ERR, |
346 | _("FATAL: unknown revents %08x in socket, terminating\n"), |
665 | _("FATAL: unknown revents %08x in socket, exiting.\n"), |
347 | revents); |
666 | revents); |
348 | exit (1); |
667 | exit (EXIT_FAILURE); |
349 | } |
668 | } |
350 | } |
669 | } |
351 | |
670 | |
352 | void |
671 | inline void |
353 | vpn::tap_ev (io_watcher &w, short revents) |
672 | vpn::tap_ev (ev::io &w, int revents) |
354 | { |
673 | { |
355 | if (revents & POLLIN) |
674 | if (revents & EV_READ) |
356 | { |
675 | { |
357 | /* process data */ |
676 | /* process data */ |
358 | tap_packet *pkt; |
677 | tap_packet *pkt; |
359 | |
678 | |
360 | pkt = tap->recv (); |
679 | pkt = tap->recv (); |
361 | |
680 | |
|
|
681 | if (!pkt) |
|
|
682 | return; |
|
|
683 | |
|
|
684 | if (pkt->len > 14) |
|
|
685 | { |
362 | int dst = mac2id (pkt->dst); |
686 | int dst = mac2id (pkt->dst); |
363 | int src = mac2id (pkt->src); |
687 | int src = mac2id (pkt->src); |
364 | |
688 | |
365 | if (src != THISNODE->id) |
689 | if (src != THISNODE->id) |
366 | { |
|
|
367 | slog (L_ERR, _("FATAL: tap packet not originating on current node received, terminating.")); |
|
|
368 | exit (1); |
|
|
369 | } |
|
|
370 | |
|
|
371 | if (dst == THISNODE->id) |
|
|
372 | { |
|
|
373 | slog (L_ERR, _("FATAL: tap packet destined for current node received, terminating.")); |
|
|
374 | exit (1); |
|
|
375 | } |
|
|
376 | |
|
|
377 | if (dst > conns.size ()) |
|
|
378 | slog (L_ERR, _("tap packet for unknown node %d received, ignoring."), dst); |
|
|
379 | else |
|
|
380 | { |
|
|
381 | if (dst) |
|
|
382 | { |
690 | { |
383 | // unicast |
691 | slog (L_ERR, _("FATAL: tap packet not originating on current node received (if-up script not working properly?), exiting.")); |
384 | if (dst != THISNODE->id) |
692 | exit (EXIT_FAILURE); |
385 | conns[dst - 1]->inject_data_packet (pkt); |
|
|
386 | } |
693 | } |
|
|
694 | |
|
|
695 | if (dst == THISNODE->id) |
|
|
696 | { |
|
|
697 | slog (L_ERR, _("FATAL: tap packet destined for current node received, exiting.")); |
|
|
698 | exit (EXIT_FAILURE); |
|
|
699 | } |
|
|
700 | |
|
|
701 | if (dst > conns.size ()) |
|
|
702 | slog (L_ERR, _("tap packet for unknown node %d received, ignoring."), dst); |
387 | else |
703 | else |
388 | { |
|
|
389 | // broadcast, first check router, then self, then english |
|
|
390 | connection *router = find_router (); |
|
|
391 | |
|
|
392 | if (router) |
|
|
393 | router->inject_data_packet (pkt, true); |
704 | inject_data_packet (pkt, dst); |
394 | else |
|
|
395 | for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c) |
|
|
396 | if ((*c)->conf != THISNODE) |
|
|
397 | (*c)->inject_data_packet (pkt); |
|
|
398 | } |
|
|
399 | } |
705 | } |
400 | |
706 | |
401 | delete pkt; |
707 | delete pkt; |
402 | } |
|
|
403 | else if (revents & (POLLHUP | POLLERR)) |
|
|
404 | { |
|
|
405 | slog (L_ERR, _("FATAL: POLLHUP or POLLERR on network device fd, terminating.")); |
|
|
406 | exit (1); |
|
|
407 | } |
708 | } |
408 | else |
709 | else |
409 | abort (); |
710 | abort (); |
410 | } |
711 | } |
411 | |
712 | |
412 | void |
713 | inline void |
413 | vpn::event_cb (time_watcher &w) |
714 | vpn::event_cb (ev::timer &w, int) |
414 | { |
715 | { |
415 | if (events) |
716 | if (events) |
416 | { |
717 | { |
417 | if (events & EVENT_SHUTDOWN) |
718 | if (events & EVENT_SHUTDOWN) |
418 | { |
719 | { |
419 | slog (L_INFO, _("preparing shutdown...")); |
720 | slog (L_INFO, _("preparing shutdown...")); |
420 | |
721 | |
421 | shutdown_all (); |
722 | shutdown_all (); |
422 | |
|
|
423 | remove_pid (pidfilename); |
723 | remove_pid (conf.pidfilename); |
424 | |
|
|
425 | slog (L_INFO, _("terminating")); |
724 | slog (L_INFO, _("exiting.")); |
426 | |
725 | exit (EXIT_SUCCESS); |
427 | exit (0); |
|
|
428 | } |
726 | } |
429 | |
727 | |
430 | if (events & EVENT_RECONNECT) |
728 | if (events & EVENT_RECONNECT) |
431 | { |
729 | { |
432 | slog (L_INFO, _("forced reconnect")); |
730 | slog (L_INFO, _("forced reconnect.")); |
433 | |
731 | |
434 | reconnect_all (); |
732 | reconnect_all (); |
435 | } |
733 | } |
436 | |
734 | |
437 | events = 0; |
735 | events = 0; |
438 | } |
736 | } |
439 | |
|
|
440 | w.at = TSTAMP_CANCEL; |
|
|
441 | } |
737 | } |
442 | |
738 | |
443 | void |
739 | void |
444 | vpn::shutdown_all () |
740 | vpn::shutdown_all () |
445 | { |
741 | { |
… | |
… | |
455 | |
751 | |
456 | conns.clear (); |
752 | conns.clear (); |
457 | |
753 | |
458 | connection_init (); |
754 | connection_init (); |
459 | |
755 | |
460 | for (configuration::node_vector::iterator i = conf.nodes.begin (); |
756 | for (configuration::node_vector::iterator i = conf.nodes.begin (); i != conf.nodes.end (); ++i) |
461 | i != conf.nodes.end (); ++i) |
757 | conns.push_back (new connection (this, *i)); |
462 | { |
|
|
463 | connection *conn = new connection (this); |
|
|
464 | |
758 | |
465 | conn->conf = *i; |
759 | for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c) |
466 | conns.push_back (conn); |
|
|
467 | |
|
|
468 | conn->establish_connection (); |
760 | (*c)->establish_connection (); |
469 | } |
|
|
470 | } |
761 | } |
471 | |
762 | |
472 | connection *vpn::find_router () |
763 | bool |
|
|
764 | vpn::can_direct (conf_node *src, conf_node *dst) const |
473 | { |
765 | { |
474 | u32 prio = 0; |
766 | return src != dst |
|
|
767 | && src->may_direct (dst) |
|
|
768 | && dst->may_direct (src) |
|
|
769 | && (((src->protocols & dst->protocols) && src->connectmode == conf_node::C_ALWAYS) |
|
|
770 | || (src->protocols & dst->connectable_protocols ())); |
|
|
771 | } |
|
|
772 | |
|
|
773 | // only works for indirect and routed connections: find a router |
|
|
774 | // from THISNODE to dst |
|
|
775 | connection * |
|
|
776 | vpn::find_router_for (const connection *dst) |
|
|
777 | { |
475 | connection *router = 0; |
778 | connection *router = 0; |
476 | |
779 | |
|
|
780 | // first try to find a router with a direct connection, route there |
|
|
781 | // regardless of any other considerations. |
|
|
782 | { |
|
|
783 | u32 prio = 1; |
|
|
784 | |
|
|
785 | for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i) |
|
|
786 | { |
|
|
787 | connection *c = *i; |
|
|
788 | |
|
|
789 | if (c->conf->routerprio > prio |
|
|
790 | && c->conf != THISNODE |
|
|
791 | && can_direct (c->conf, dst->conf) |
|
|
792 | && c->ictx && c->octx) |
|
|
793 | { |
|
|
794 | prio = c->conf->routerprio; |
|
|
795 | router = c; |
|
|
796 | } |
|
|
797 | } |
|
|
798 | } |
|
|
799 | |
|
|
800 | if (router) |
|
|
801 | return router; |
|
|
802 | |
|
|
803 | // second try find the router with the highest priority, higher than ours |
|
|
804 | { |
|
|
805 | u32 prio = THISNODE->routerprio ? THISNODE->routerprio : 1; |
|
|
806 | |
|
|
807 | for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i) |
|
|
808 | { |
|
|
809 | connection *c = *i; |
|
|
810 | |
|
|
811 | if (c->conf->routerprio > prio |
|
|
812 | && c != dst |
|
|
813 | && c->conf != THISNODE |
|
|
814 | && c->ictx && c->octx) |
|
|
815 | { |
|
|
816 | prio = c->conf->routerprio; |
|
|
817 | router = c; |
|
|
818 | } |
|
|
819 | } |
|
|
820 | } |
|
|
821 | |
|
|
822 | return router; |
|
|
823 | } |
|
|
824 | |
|
|
825 | void |
|
|
826 | vpn::connection_established (connection *c) |
|
|
827 | { |
477 | for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i) |
828 | for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i) |
478 | { |
829 | { |
479 | connection *c = *i; |
830 | connection *o = *i; |
480 | |
831 | |
481 | if (c->conf->routerprio > prio |
832 | if (!o->is_direct |
482 | && c->connectmode == conf_node::C_ALWAYS |
833 | && o->si.valid () |
483 | && c->conf != THISNODE |
834 | && c->si != o->si |
484 | && c->ictx && c->octx) |
835 | && c == find_router_for (o)) |
485 | { |
|
|
486 | prio = c->conf->routerprio; |
|
|
487 | router = c; |
|
|
488 | } |
836 | { |
|
|
837 | slog (L_DEBUG, _("%s: can now route packets via %s, re-keying connection."), |
|
|
838 | o->conf->nodename, c->conf->nodename); |
|
|
839 | o->rekey (); |
|
|
840 | } |
489 | } |
841 | } |
490 | |
|
|
491 | return router; |
|
|
492 | } |
842 | } |
493 | |
843 | |
494 | void vpn::connect_request (int id) |
844 | void |
|
|
845 | vpn::send_connect_request (connection *c) |
495 | { |
846 | { |
496 | connection *c = find_router (); |
847 | connection *r = find_router_for (c); |
497 | |
848 | |
498 | if (c) |
849 | if (r) |
|
|
850 | { |
|
|
851 | slog (L_TRACE, _("%s: no address known, sending mediated connection request via %s."), |
|
|
852 | c->conf->nodename, r->conf->nodename); |
499 | c->connect_request (id); |
853 | r->send_connect_request (c->conf->id); |
500 | //else // does not work, because all others must connect to the same router |
854 | } |
501 | // // no router found, aggressively connect to all routers |
855 | else |
502 | // for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i) |
856 | slog (L_DEBUG, _("%s: no way to connect and no router found: unable to connect at this time."), |
503 | // if ((*i)->conf->routerprio) |
857 | c->conf->nodename); |
504 | // (*i)->establish_connection (); |
|
|
505 | } |
858 | } |
506 | |
859 | |
507 | void |
860 | void |
508 | connection::dump_status () |
861 | connection::dump_status () |
509 | { |
862 | { |
510 | slog (L_NOTICE, _("node %s (id %d)"), conf->nodename, conf->id); |
863 | slog (L_NOTICE, _("node %s (id %d)"), conf->nodename, conf->id); |
511 | slog (L_NOTICE, _(" connectmode %d (%d) / sockaddr %s / minor %d"), |
864 | slog (L_NOTICE, _(" connectmode %d (%d) / sockaddr %s / minor %d"), |
512 | connectmode, conf->connectmode, (const char *)si, (int)prot_minor); |
865 | connectmode, conf->connectmode, (const char *)si, (int)prot_minor); |
513 | slog (L_NOTICE, _(" ictx/octx %08lx/%08lx / oseqno %d / retry_cnt %d"), |
866 | slog (L_NOTICE, _(" ictx/octx %08lx/%08lx / oseqno %d / retry_cnt %d"), |
514 | (long)ictx, (long)octx, (int)oseqno, (int)retry_cnt); |
867 | (long)ictx, (long)octx, (int)oseqno, (int)retry_cnt); |
515 | slog (L_NOTICE, _(" establish_conn %ld / rekey %ld / keepalive %ld"), |
|
|
516 | (long)(establish_connection.at), (long)(rekey.at), (long)(keepalive.at)); |
|
|
517 | } |
868 | } |
518 | |
869 | |
519 | void |
870 | void |
520 | vpn::dump_status () |
871 | vpn::dump_status () |
521 | { |
872 | { |
522 | slog (L_NOTICE, _("BEGIN status dump (%ld)"), (long)NOW); |
873 | slog (L_NOTICE, _("BEGIN status dump (%ld)"), (long)ev_now ()); |
523 | |
874 | |
524 | for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c) |
875 | for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c) |
525 | (*c)->dump_status (); |
876 | (*c)->dump_status (); |
526 | |
877 | |
527 | slog (L_NOTICE, _("END status dump")); |
878 | slog (L_NOTICE, _("END status dump")); |
528 | } |
879 | } |
529 | |
880 | |
530 | vpn::vpn (void) |
881 | vpn::vpn (void) |
531 | : event(this, &vpn::event_cb) |
882 | { |
|
|
883 | event .set<vpn, &vpn::event_cb > (this); |
532 | , udpv4_ev_watcher(this, &vpn::udpv4_ev) |
884 | udpv4_ev_watcher .set<vpn, &vpn::udpv4_ev > (this); |
533 | , ipv4_ev_watcher (this, &vpn::ipv4_ev) |
885 | ipv4_ev_watcher .set<vpn, &vpn::ipv4_ev > (this); |
534 | , tap_ev_watcher (this, &vpn::tap_ev) |
|
|
535 | #if ENABLE_TCP |
886 | #if ENABLE_TCP |
536 | , tcpv4_ev_watcher(this, &vpn::tcpv4_ev) |
887 | tcpv4_ev_watcher .set<vpn, &vpn::tcpv4_ev > (this); |
537 | #endif |
888 | #endif |
538 | { |
889 | #if ENABLE_ICMP |
|
|
890 | icmpv4_ev_watcher.set<vpn, &vpn::icmpv4_ev> (this); |
|
|
891 | #endif |
|
|
892 | #if ENABLE_DNS |
|
|
893 | dnsv4_ev_watcher .set<vpn, &vpn::dnsv4_ev > (this); |
|
|
894 | #endif |
|
|
895 | tap_ev_watcher .set<vpn, &vpn::tap_ev > (this); |
539 | } |
896 | } |
540 | |
897 | |
541 | vpn::~vpn () |
898 | vpn::~vpn () |
542 | { |
899 | { |
543 | } |
900 | } |