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) 2003-2008,2010,2011,2013 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> |
43 | #include <sys/stat.h> |
32 | #include <arpa/inet.h> |
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33 | #include <errno.h> |
44 | #include <errno.h> |
34 | #include <time.h> |
45 | #include <time.h> |
35 | #include <unistd.h> |
46 | #include <unistd.h> |
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47 | #include <fcntl.h> |
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48 | #include <sys/socket.h> |
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49 | |
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50 | #include "netcompat.h" |
36 | |
51 | |
37 | #include "pidfile.h" |
52 | #include "pidfile.h" |
38 | |
53 | |
39 | #include "connection.h" |
54 | #include "connection.h" |
40 | #include "util.h" |
55 | #include "util.h" |
41 | #include "vpn.h" |
56 | #include "vpn.h" |
42 | |
57 | |
43 | #if ENABLE_TCP |
58 | using namespace std; |
44 | # include <map> |
59 | |
45 | # include <unistd.h> |
60 | vpn network; // THE vpn (bad design...) |
46 | # include <fcntl.h> |
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47 | # include <sys/poll.h> |
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48 | #endif |
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49 | |
61 | |
50 | ///////////////////////////////////////////////////////////////////////////// |
62 | ///////////////////////////////////////////////////////////////////////////// |
51 | |
63 | |
52 | const char *vpn::script_if_up () |
64 | static void inline |
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65 | set_tos (int fd, int &tos_prev, int tos) |
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66 | { |
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67 | #if defined(SOL_IP) && defined(IP_TOS) |
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68 | if (tos_prev == tos) |
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69 | return; |
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70 | |
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71 | tos_prev = tos; |
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72 | setsockopt (fd, SOL_IP, IP_TOS, &tos, sizeof tos); |
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73 | #endif |
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74 | } |
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75 | |
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76 | void |
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77 | vpn::script_init_env () |
53 | { |
78 | { |
54 | // the tunnel device mtu should be the physical mtu - overhead |
79 | // the tunnel device mtu should be the physical mtu - overhead |
55 | // the tricky part is rounding to the cipher key blocksize |
80 | // the tricky part is rounding to the cipher key blocksize |
56 | int mtu = conf.mtu - ETH_OVERHEAD - VPE_OVERHEAD - MAX_OVERHEAD; |
81 | int mtu = conf.mtu - ETH_OVERHEAD - VPE_OVERHEAD - MAX_OVERHEAD; |
57 | mtu += ETH_OVERHEAD - 6 - 6; // now we have the data portion |
82 | mtu += ETH_OVERHEAD - 6 - 6; // now we have the data portion |
58 | mtu -= mtu % EVP_CIPHER_block_size (CIPHER); // round |
83 | mtu -= mtu % BLOCK_SIZE (CIPHER); // round |
59 | mtu -= ETH_OVERHEAD - 6 - 6; // and get interface mtu again |
84 | mtu -= ETH_OVERHEAD - 6 - 6; // and get interface mtu again |
60 | |
85 | |
61 | char *env; |
86 | char *env; |
62 | asprintf (&env, "CONFBASE=%s", confbase); |
87 | asprintf (&env, "CONFBASE=%s", confbase); putenv (env); |
63 | putenv (env); |
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64 | asprintf (&env, "NODENAME=%s", THISNODE->nodename); |
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65 | putenv (env); |
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66 | asprintf (&env, "NODEID=%d", THISNODE->id); |
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67 | putenv (env); |
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68 | asprintf (&env, "IFNAME=%s", tap->interface ()); |
88 | asprintf (&env, "IFNAME=%s", tap->interface ()); putenv (env); |
69 | putenv (env); |
89 | asprintf (&env, "IFTYPE=%s", IFTYPE); putenv (env); |
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90 | asprintf (&env, "IFSUBTYPE=%s", IFSUBTYPE); putenv (env); |
70 | asprintf (&env, "MTU=%d", mtu); |
91 | asprintf (&env, "MTU=%d", mtu); putenv (env); |
71 | putenv (env); |
92 | asprintf (&env, "NODES=%d", conns.size ()); putenv (env); |
72 | asprintf (&env, "MAC=%02x:%02x:%02x:%02x:%02x:%02x", |
93 | asprintf (&env, "NODEID=%d", THISNODE->id); putenv (env); |
73 | 0xfe, 0xfd, 0x80, 0x00, THISNODE->id >> 8, |
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74 | THISNODE->id & 0xff); |
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75 | putenv (env); |
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76 | |
94 | |
77 | return ::conf.script_if_up ? ::conf.script_if_up : "if-up"; |
95 | conns [THISNODE->id - 1]->script_init_env (""); |
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96 | |
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97 | for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c) |
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98 | { |
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99 | char ext[16]; |
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100 | snprintf (ext, 16, "_%d", (*c)->conf->id); |
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101 | (*c)->script_init_env (ext); |
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102 | } |
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103 | } |
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104 | |
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105 | inline const char * |
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106 | vpn::script_if_init () |
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107 | { |
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108 | script_init_env (); |
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109 | |
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110 | return tap->if_up (); |
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111 | } |
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112 | |
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113 | inline const char * |
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114 | vpn::script_if_up () |
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115 | { |
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116 | script_init_env (); |
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117 | |
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118 | return conf.config_filename (::conf.script_if_up, "if-up"); |
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119 | } |
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120 | |
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121 | int |
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122 | vpn::setup_socket (u8 prot, int family, int type, int proto) |
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123 | { |
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124 | int fd = socket (family, type, proto); |
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125 | |
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126 | if (fd < 0) |
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127 | { |
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128 | slog (L_ERR, _("unable to create %s socket: %s."), strprotocol (prot), strerror (errno)); |
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129 | return fd; |
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130 | } |
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131 | |
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132 | fcntl (fd, F_SETFL, O_NONBLOCK); |
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133 | fcntl (fd, F_SETFD, FD_CLOEXEC); |
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134 | |
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135 | #ifdef SO_MARK |
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136 | if (::conf.nfmark) |
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137 | if (setsockopt (fd, SOL_SOCKET, SO_MARK, &::conf.nfmark, sizeof ::conf.nfmark)) |
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138 | slog (L_WARN, _("unable to set nfmark on %s socket: %s"), strprotocol (prot), strerror (errno)); |
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139 | #endif |
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140 | |
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141 | return fd; |
78 | } |
142 | } |
79 | |
143 | |
80 | int |
144 | int |
81 | vpn::setup () |
145 | vpn::setup () |
82 | { |
146 | { |
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147 | int success = 0; |
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148 | |
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149 | ipv4_tos = -1; |
83 | udpv4_fd = -1; |
150 | ipv4_fd = -1; |
84 | |
151 | |
85 | if (THISNODE->protocols & PROT_UDPv4) |
152 | if (THISNODE->protocols & PROT_IPv4 && ::conf.ip_proto) |
86 | { |
153 | { |
87 | udpv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP); |
154 | ipv4_fd = setup_socket (PROT_IPv4, PF_INET, SOCK_RAW, ::conf.ip_proto); |
88 | |
155 | |
89 | if (udpv4_fd < 0) |
156 | if (ipv4_fd < 0) |
90 | return -1; |
157 | return -1; |
91 | |
158 | |
92 | // standard daemon practise... |
159 | #if defined(SOL_IP) && defined(IP_MTU_DISCOVER) |
93 | { |
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94 | int oval = 1; |
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95 | setsockopt (udpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval); |
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96 | } |
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97 | |
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98 | sockinfo si (THISNODE, PROT_UDPv4); |
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99 | |
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100 | if (bind (udpv4_fd, si.sav4 (), si.salenv4 ())) |
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101 | { |
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102 | slog (L_ERR, _("can't bind udpv4 on %s: %s"), (const char *)si, strerror (errno)); |
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103 | exit (1); |
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104 | } |
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105 | |
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106 | #ifdef IP_MTU_DISCOVER |
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107 | // this I really consider a linux bug. I am neither connected |
160 | // this I really consider a linux bug. I am neither connected |
108 | // nor do I fragment myself. Linux still sets DF and doesn't |
161 | // nor do I fragment myself. Linux still sets DF and doesn't |
109 | // fragment for me sometimes. |
162 | // fragment for me sometimes. |
110 | { |
163 | { |
111 | int oval = IP_PMTUDISC_DONT; |
164 | int oval = IP_PMTUDISC_DONT; |
112 | setsockopt (udpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval); |
165 | setsockopt (ipv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval); |
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166 | } |
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167 | #endif |
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168 | |
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169 | sockinfo si (THISNODE, PROT_IPv4); |
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170 | |
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171 | if (bind (ipv4_fd, si.sav4 (), si.salenv4 ())) |
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172 | { |
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173 | slog (L_ERR, _("can't bind ipv4 socket on %s: %s, exiting."), (const char *)si, strerror (errno)); |
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174 | return -1; |
113 | } |
175 | } |
114 | #endif |
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115 | |
176 | |
116 | udpv4_ev_watcher.start (udpv4_fd, POLLIN); |
177 | ipv4_ev_watcher.start (ipv4_fd, EV_READ); |
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178 | ++success; |
117 | } |
179 | } |
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180 | else |
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181 | THISNODE->protocols &= ~PROT_IPv4; |
118 | |
182 | |
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183 | udpv4_tos = -1; |
119 | ipv4_fd = -1; |
184 | udpv4_fd = -1; |
120 | if (THISNODE->protocols & PROT_IPv4) |
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121 | { |
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122 | ipv4_fd = socket (PF_INET, SOCK_RAW, ::conf.ip_proto); |
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123 | |
185 | |
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186 | if (THISNODE->protocols & PROT_UDPv4 && THISNODE->udp_port) |
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187 | { |
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188 | udpv4_fd = setup_socket (PROT_UDPv4, PF_INET, SOCK_DGRAM, IPPROTO_UDP); |
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189 | |
124 | if (ipv4_fd < 0) |
190 | if (udpv4_fd < 0) |
125 | return -1; |
191 | return -1; |
126 | |
192 | |
127 | sockinfo si (THISNODE, PROT_IPv4); |
193 | // standard daemon practise... |
128 | |
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129 | if (bind (ipv4_fd, si.sav4 (), si.salenv4 ())) |
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130 | { |
194 | { |
131 | slog (L_ERR, _("can't bind ipv4 socket on %s: %s"), (const char *)si, strerror (errno)); |
195 | int oval = 1; |
132 | exit (1); |
196 | setsockopt (udpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval); |
133 | } |
197 | } |
134 | |
198 | |
135 | #ifdef IP_MTU_DISCOVER |
199 | #if defined(SOL_IP) && defined(IP_MTU_DISCOVER) |
136 | // this I really consider a linux bug. I am neither connected |
200 | // this I really consider a linux bug. I am neither connected |
137 | // nor do I fragment myself. Linux still sets DF and doesn't |
201 | // nor do I fragment myself. Linux still sets DF and doesn't |
138 | // fragment for me sometimes. |
202 | // fragment for me sometimes. |
139 | { |
203 | { |
140 | int oval = IP_PMTUDISC_DONT; |
204 | int oval = IP_PMTUDISC_DONT; |
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205 | setsockopt (udpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval); |
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206 | } |
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207 | #endif |
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208 | |
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209 | sockinfo si (THISNODE, PROT_UDPv4); |
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210 | |
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211 | if (bind (udpv4_fd, si.sav4 (), si.salenv4 ())) |
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212 | { |
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213 | slog (L_ERR, _("can't bind udpv4 on %s: %s, exiting."), (const char *)si, strerror (errno)); |
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214 | return -1; |
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215 | } |
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216 | |
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217 | udpv4_ev_watcher.start (udpv4_fd, EV_READ); |
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218 | ++success; |
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219 | } |
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220 | else |
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221 | THISNODE->protocols &= ~PROT_UDPv4; |
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222 | |
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223 | icmpv4_tos = -1; |
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224 | icmpv4_fd = -1; |
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225 | |
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226 | #if ENABLE_ICMP |
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227 | if (THISNODE->protocols & PROT_ICMPv4) |
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228 | { |
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229 | icmpv4_fd = setup_socket (PROT_ICMPv4, PF_INET, SOCK_RAW, IPPROTO_ICMP); |
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230 | |
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231 | if (icmpv4_fd < 0) |
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232 | return -1; |
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233 | |
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234 | #ifdef ICMP_FILTER |
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235 | { |
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236 | icmp_filter oval; |
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237 | oval.data = 0xffffffff; |
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238 | if (::conf.icmp_type < 32) |
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239 | oval.data &= ~(1 << ::conf.icmp_type); |
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240 | |
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241 | setsockopt (icmpv4_fd, SOL_RAW, ICMP_FILTER, &oval, sizeof oval); |
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242 | } |
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243 | #endif |
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244 | |
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245 | #if defined(SOL_IP) && defined(IP_MTU_DISCOVER) |
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246 | // this I really consider a linux bug. I am neither connected |
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247 | // nor do I fragment myself. Linux still sets DF and doesn't |
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248 | // fragment for me sometimes. |
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249 | { |
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250 | int oval = IP_PMTUDISC_DONT; |
141 | setsockopt (ipv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval); |
251 | setsockopt (icmpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval); |
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252 | } |
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253 | #endif |
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254 | |
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255 | sockinfo si (THISNODE, PROT_ICMPv4); |
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256 | |
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257 | if (bind (icmpv4_fd, si.sav4 (), si.salenv4 ())) |
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258 | { |
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259 | slog (L_ERR, _("can't bind icmpv4 on %s: %s, exiting."), (const char *)si, strerror (errno)); |
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260 | return -1; |
142 | } |
261 | } |
143 | #endif |
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144 | |
262 | |
145 | ipv4_ev_watcher.start (ipv4_fd, POLLIN); |
263 | icmpv4_ev_watcher.start (icmpv4_fd, EV_READ); |
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264 | ++success; |
146 | } |
265 | } |
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266 | #endif |
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267 | |
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268 | tcpv4_fd = -1; |
147 | |
269 | |
148 | #if ENABLE_TCP |
270 | #if ENABLE_TCP |
149 | if (THISNODE->protocols & PROT_TCPv4) |
271 | if (THISNODE->protocols & PROT_TCPv4 && THISNODE->tcp_port) |
150 | { |
272 | { |
151 | tcpv4_fd = socket (PF_INET, SOCK_STREAM, IPPROTO_TCP); |
273 | tcpv4_fd = setup_socket (PROT_TCPv4, PF_INET, SOCK_STREAM, IPPROTO_TCP); |
152 | |
274 | |
153 | if (tcpv4_fd < 0) |
275 | if (tcpv4_fd < 0) |
154 | return -1; |
276 | return -1; |
155 | |
277 | |
156 | // standard daemon practise... |
278 | // standard daemon practise... |
… | |
… | |
161 | |
283 | |
162 | sockinfo si (THISNODE, PROT_TCPv4); |
284 | sockinfo si (THISNODE, PROT_TCPv4); |
163 | |
285 | |
164 | if (bind (tcpv4_fd, si.sav4 (), si.salenv4 ())) |
286 | if (bind (tcpv4_fd, si.sav4 (), si.salenv4 ())) |
165 | { |
287 | { |
166 | slog (L_ERR, _("can't bind tcpv4 on %s: %s"), (const char *)si, strerror (errno)); |
288 | slog (L_ERR, _("can't bind tcpv4 on %s: %s, exiting."), (const char *)si, strerror (errno)); |
167 | exit (1); |
289 | return -1; |
168 | } |
290 | } |
169 | |
291 | |
170 | if (listen (tcpv4_fd, 5)) |
292 | if (listen (tcpv4_fd, 5)) |
171 | { |
293 | { |
172 | slog (L_ERR, _("can't listen tcpv4 on %s: %s"), (const char *)si, strerror (errno)); |
294 | slog (L_ERR, _("can't listen tcpv4 on %s: %s, exiting."), (const char *)si, strerror (errno)); |
173 | exit (1); |
295 | return -1; |
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296 | } |
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297 | |
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298 | tcpv4_ev_watcher.start (tcpv4_fd, EV_READ); |
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299 | ++success; |
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300 | } |
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301 | else |
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302 | THISNODE->protocols &= ~PROT_TCPv4; |
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303 | #endif |
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304 | |
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305 | dnsv4_tos = -1; |
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306 | dnsv4_fd = -1; |
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307 | |
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308 | #if ENABLE_DNS |
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309 | if (THISNODE->protocols & PROT_DNSv4) |
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310 | { |
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311 | dns_forwarder.set (::conf.dns_forw_host, ::conf.dns_forw_port, PROT_DNSv4); |
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312 | |
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313 | dnsv4_fd = setup_socket (PROT_DNSv4, PF_INET, SOCK_DGRAM, IPPROTO_UDP); |
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314 | |
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315 | if (dnsv4_fd < 0) |
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316 | return -1; |
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317 | |
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318 | # if defined(SOL_IP) && defined(IP_MTU_DISCOVER) |
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319 | // this I really consider a linux bug. I am neither connected |
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320 | // nor do I fragment myself. Linux still sets DF and doesn't |
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321 | // fragment for me sometimes. |
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322 | { |
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323 | int oval = IP_PMTUDISC_DONT; |
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324 | setsockopt (dnsv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval); |
174 | } |
325 | } |
175 | |
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176 | tcpv4_ev_watcher.start (tcpv4_fd, POLLIN); |
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177 | } |
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178 | #endif |
326 | # endif |
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327 | |
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328 | // standard daemon practise... |
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329 | { |
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330 | int oval = 1; |
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331 | setsockopt (dnsv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval); |
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332 | } |
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333 | |
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334 | sockinfo si (THISNODE->dns_hostname, |
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335 | THISNODE->dns_hostname ? THISNODE->dns_port : 0, |
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336 | PROT_DNSv4); |
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337 | |
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|
338 | if (bind (dnsv4_fd, si.sav4 (), si.salenv4 ())) |
|
|
339 | { |
|
|
340 | slog (L_ERR, _("can't bind dnsv4 on %s: %s, exiting."), (const char *)si, strerror (errno)); |
|
|
341 | return -1; |
|
|
342 | } |
|
|
343 | |
|
|
344 | dnsv4_ev_watcher.start (dnsv4_fd, EV_READ); |
|
|
345 | ++success; |
|
|
346 | } |
|
|
347 | #endif |
|
|
348 | |
|
|
349 | ///////////////////////////////////////////////////////////////////////////// |
|
|
350 | |
|
|
351 | if (!success) |
|
|
352 | { |
|
|
353 | slog (L_ERR, _("no protocols enabled.")); |
|
|
354 | return -1; |
|
|
355 | } |
|
|
356 | |
|
|
357 | reconnect_all (); |
|
|
358 | |
|
|
359 | ///////////////////////////////////////////////////////////////////////////// |
179 | |
360 | |
180 | tap = new tap_device (); |
361 | tap = new tap_device (); |
181 | if (!tap) //D this, of course, never catches |
362 | if (!tap) //D this, of course, never catches |
182 | { |
363 | { |
183 | slog (L_ERR, _("cannot create network interface '%s'"), conf.ifname); |
364 | slog (L_ERR, _("cannot create network interface '%s'."), conf.ifname); |
184 | exit (1); |
365 | return -1; |
185 | } |
366 | } |
186 | |
367 | |
187 | run_script (run_script_cb (this, &vpn::script_if_up), true); |
368 | fcntl (tap->fd, F_SETFD, FD_CLOEXEC); |
188 | |
369 | |
|
|
370 | run_script_cb cb; |
|
|
371 | cb.set<vpn, &vpn::script_if_init> (this); |
|
|
372 | |
|
|
373 | if (tap->if_up () && |
|
|
374 | !run_script (cb, true)) |
|
|
375 | { |
|
|
376 | slog (L_ERR, _("interface initialization command '%s' failed."), |
|
|
377 | tap->if_up ()); |
|
|
378 | return -1; |
|
|
379 | } |
|
|
380 | |
|
|
381 | cb.set<vpn, &vpn::script_if_up> (this); |
|
|
382 | if (!run_script (cb, true)) |
|
|
383 | { |
|
|
384 | slog (L_ERR, _("if-up command execution failed.")); |
|
|
385 | return -1; |
|
|
386 | } |
|
|
387 | |
189 | tap_ev_watcher.start (tap->fd, POLLIN); |
388 | tap_ev_watcher.start (tap->fd, EV_READ); |
190 | |
|
|
191 | reconnect_all (); |
|
|
192 | |
389 | |
193 | return 0; |
390 | return 0; |
194 | } |
391 | } |
195 | |
392 | |
|
|
393 | bool |
|
|
394 | vpn::drop_privileges () |
|
|
395 | { |
|
|
396 | if (::conf.change_root) |
|
|
397 | { |
|
|
398 | if (!strcmp (::conf.change_root, "/")) |
|
|
399 | { |
|
|
400 | char dir [L_tmpnam]; |
|
|
401 | if (!tmpnam (dir)) |
|
|
402 | { |
|
|
403 | slog (L_CRIT, _("unable to create anonymous root path.")); |
|
|
404 | return false; |
|
|
405 | } |
|
|
406 | |
|
|
407 | if (mkdir (dir, 0700)) |
|
|
408 | { |
|
|
409 | slog (L_CRIT, _("unable to crate anonymous root directory.")); |
|
|
410 | return false; |
|
|
411 | } |
|
|
412 | |
|
|
413 | if (chdir (dir)) |
|
|
414 | { |
|
|
415 | slog (L_CRIT, _("unable to change to anonymous root directory.")); |
|
|
416 | return false; |
|
|
417 | } |
|
|
418 | |
|
|
419 | if (rmdir (dir)) |
|
|
420 | slog (L_ERR, _("unable to remove anonymous root directory, continuing.")); |
|
|
421 | } |
|
|
422 | else |
|
|
423 | { |
|
|
424 | if (chdir (::conf.change_root)) |
|
|
425 | { |
|
|
426 | slog (L_CRIT, _("%s: unable to change to specified root directory."), ::conf.change_root); |
|
|
427 | return false; |
|
|
428 | } |
|
|
429 | } |
|
|
430 | |
|
|
431 | if (chroot (".")) |
|
|
432 | { |
|
|
433 | slog (L_CRIT, _("unable to set new root directory.")); |
|
|
434 | return false; |
|
|
435 | } |
|
|
436 | |
|
|
437 | if (chdir ("/")) |
|
|
438 | { |
|
|
439 | slog (L_CRIT, _("unable to set cwd to new root directory.")); |
|
|
440 | return false; |
|
|
441 | } |
|
|
442 | } |
|
|
443 | |
|
|
444 | if (::conf.change_gid) |
|
|
445 | if (setgid (::conf.change_gid)) |
|
|
446 | { |
|
|
447 | slog (L_CRIT, _("unable to change group id to %d."), ::conf.change_gid); |
|
|
448 | return false; |
|
|
449 | } |
|
|
450 | |
|
|
451 | if (::conf.change_uid) |
|
|
452 | if (setuid (::conf.change_uid)) |
|
|
453 | { |
|
|
454 | slog (L_CRIT, _("unable to change user id to %d."), ::conf.change_uid); |
|
|
455 | return false; |
|
|
456 | } |
|
|
457 | |
|
|
458 | return true; |
|
|
459 | } |
|
|
460 | |
|
|
461 | bool |
|
|
462 | vpn::send_ipv4_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
|
|
463 | { |
|
|
464 | set_tos (ipv4_fd, ipv4_tos, tos); |
|
|
465 | sendto (ipv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ()); |
|
|
466 | |
|
|
467 | return true; |
|
|
468 | } |
|
|
469 | |
|
|
470 | static u16 |
|
|
471 | ipv4_checksum (u16 *data, unsigned int len) |
|
|
472 | { |
|
|
473 | // use 32 bit accumulator and fold back carry bits at the end |
|
|
474 | u32 sum = 0; |
|
|
475 | |
|
|
476 | while (len > 1) |
|
|
477 | { |
|
|
478 | sum += *data++; |
|
|
479 | len -= 2; |
|
|
480 | } |
|
|
481 | |
|
|
482 | // odd byte left? |
|
|
483 | if (len) |
|
|
484 | sum += *(u8 *)data; |
|
|
485 | |
|
|
486 | // add back carry bits |
|
|
487 | sum = (sum >> 16) + (sum & 0xffff); // lo += hi |
|
|
488 | sum += (sum >> 16); // carry |
|
|
489 | |
|
|
490 | return ~sum; |
|
|
491 | } |
|
|
492 | |
|
|
493 | #if ENABLE_ICMP |
|
|
494 | bool |
|
|
495 | vpn::send_icmpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
|
|
496 | { |
|
|
497 | pkt->unshift_hdr (4); |
|
|
498 | |
|
|
499 | icmp_header *hdr = (icmp_header *)&((*pkt)[0]); |
|
|
500 | hdr->type = ::conf.icmp_type; |
|
|
501 | hdr->code = 255; |
|
|
502 | hdr->checksum = 0; |
|
|
503 | hdr->checksum = ipv4_checksum ((u16 *)hdr, pkt->len); |
|
|
504 | |
|
|
505 | set_tos (icmpv4_fd, icmpv4_tos, tos); |
|
|
506 | sendto (icmpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ()); |
|
|
507 | |
|
|
508 | return true; |
|
|
509 | } |
|
|
510 | #endif |
|
|
511 | |
|
|
512 | bool |
|
|
513 | vpn::send_udpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
|
|
514 | { |
|
|
515 | set_tos (udpv4_fd, udpv4_tos, tos); |
|
|
516 | sendto (udpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ()); |
|
|
517 | |
|
|
518 | return true; |
|
|
519 | } |
|
|
520 | |
196 | void |
521 | void |
197 | vpn::send_ipv4_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
522 | vpn::inject_data_packet (tap_packet *pkt, int dst) |
198 | { |
523 | { |
199 | setsockopt (ipv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos); |
524 | if (dst) |
200 | sendto (ipv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ()); |
525 | { |
201 | } |
526 | // unicast |
202 | |
527 | if (dst != THISNODE->id) |
203 | void |
528 | conns[dst - 1]->inject_data_packet (pkt); |
204 | vpn::send_udpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
529 | } |
205 | { |
530 | else |
206 | setsockopt (udpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos); |
531 | { |
207 | sendto (udpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ()); |
532 | // broadcast, this is ugly, but due to the security policy |
|
|
533 | // we have to connect to all hosts... |
|
|
534 | for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c) |
|
|
535 | if ((*c)->conf != THISNODE) |
|
|
536 | (*c)->inject_data_packet (pkt); |
|
|
537 | } |
208 | } |
538 | } |
209 | |
539 | |
210 | void |
540 | void |
211 | vpn::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi) |
541 | vpn::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi) |
212 | { |
542 | { |
213 | unsigned int src = pkt->src (); |
543 | unsigned int src = pkt->src (); |
214 | unsigned int dst = pkt->dst (); |
544 | unsigned int dst = pkt->dst (); |
215 | |
545 | |
216 | slog (L_NOISE, _("<<?/%s received possible vpn packet type %d from %d to %d, length %d"), |
546 | slog (L_NOISE, _("<<?/%s received possible vpn packet type %d from %d to %d, length %d."), |
217 | (const char *)rsi, pkt->typ (), pkt->src (), pkt->dst (), pkt->len); |
547 | (const char *)rsi, pkt->typ (), pkt->src (), pkt->dst (), pkt->len); |
218 | |
548 | |
219 | if (src == 0 || src > conns.size () |
549 | if (src == 0 || src > conns.size () |
220 | || dst > conns.size () |
550 | || dst > conns.size () |
221 | || pkt->typ () >= vpn_packet::PT_MAX) |
551 | || pkt->typ () >= vpn_packet::PT_MAX) |
222 | slog (L_WARN, _("(%s): received corrupted packet type %d (src %d, dst %d)"), |
552 | slog (L_WARN, _("(%s): received corrupted packet type %d (src %d, dst %d)."), |
223 | (const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ()); |
553 | (const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ()); |
224 | else |
554 | else |
225 | { |
555 | { |
226 | connection *c = conns[src - 1]; |
556 | connection *c = conns[src - 1]; |
227 | |
557 | |
228 | if (dst == 0 && !THISNODE->routerprio) |
558 | if (dst == 0) |
229 | slog (L_WARN, _("%s(%s): received broadcast, but we are no router"), |
559 | slog (L_WARN, _("%s(%s): received broadcast (protocol violation)."), |
230 | c->conf->nodename, (const char *)rsi); |
560 | c->conf->nodename, (const char *)rsi); |
231 | else if (dst != 0 && dst != THISNODE->id) |
561 | else if (dst != THISNODE->id) |
232 | // FORWARDING NEEDED ;) |
562 | { |
|
|
563 | if (THISNODE->routerprio) |
|
|
564 | // the tos setting gets lost here. who cares. |
|
|
565 | conns[dst - 1]->inject_vpn_packet (pkt); |
|
|
566 | else |
233 | slog (L_WARN, |
567 | slog (L_WARN, |
234 | _("received frame for node %d ('%s') from %s, but this is node %d ('%s')"), |
568 | _("%s(%s): request to forward packet to %s, but we are no router (config mismatch?)."), |
|
|
569 | c->conf->nodename, (const char *)rsi, |
235 | dst, conns[dst - 1]->conf->nodename, |
570 | conns[dst - 1]->conf->nodename); |
236 | (const char *)rsi, |
571 | } |
237 | THISNODE->id, THISNODE->nodename); |
|
|
238 | else |
572 | else |
239 | c->recv_vpn_packet (pkt, rsi); |
573 | c->recv_vpn_packet (pkt, rsi); |
240 | } |
574 | } |
241 | } |
575 | } |
242 | |
576 | |
243 | void |
577 | bool |
244 | vpn::udpv4_ev (io_watcher &w, short revents) |
578 | vpn::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
245 | { |
579 | { |
246 | if (revents & (POLLIN | POLLERR)) |
580 | switch (si.prot) |
|
|
581 | { |
|
|
582 | case PROT_IPv4: |
|
|
583 | return send_ipv4_packet (pkt, si, tos); |
|
|
584 | |
|
|
585 | case PROT_UDPv4: |
|
|
586 | return send_udpv4_packet (pkt, si, tos); |
|
|
587 | |
|
|
588 | #if ENABLE_TCP |
|
|
589 | case PROT_TCPv4: |
|
|
590 | return send_tcpv4_packet (pkt, si, tos); |
|
|
591 | #endif |
|
|
592 | #if ENABLE_ICMP |
|
|
593 | case PROT_ICMPv4: |
|
|
594 | return send_icmpv4_packet (pkt, si, tos); |
|
|
595 | #endif |
|
|
596 | #if ENABLE_DNS |
|
|
597 | case PROT_DNSv4: |
|
|
598 | return send_dnsv4_packet (pkt, si, tos); |
|
|
599 | #endif |
|
|
600 | default: |
|
|
601 | slog (L_CRIT, _("%s: FATAL: trying to send packet with unsupported protocol."), (const char *)si); |
|
|
602 | } |
|
|
603 | |
|
|
604 | return false; |
|
|
605 | } |
|
|
606 | |
|
|
607 | inline void |
|
|
608 | vpn::ipv4_ev (ev::io &w, int revents) |
|
|
609 | { |
|
|
610 | if (revents & EV_READ) |
247 | { |
611 | { |
248 | vpn_packet *pkt = new vpn_packet; |
612 | vpn_packet *pkt = new vpn_packet; |
249 | struct sockaddr_in sa; |
613 | struct sockaddr_in sa; |
250 | socklen_t sa_len = sizeof (sa); |
614 | socklen_t sa_len = sizeof (sa); |
251 | int len; |
615 | int len; |
252 | |
616 | |
253 | len = recvfrom (w.p->fd, &((*pkt)[0]), MAXSIZE, 0, (sockaddr *)&sa, &sa_len); |
617 | len = recvfrom (w.fd, &((*pkt)[0]), MAXSIZE, 0, (sockaddr *)&sa, &sa_len); |
254 | |
618 | |
255 | sockinfo si(sa); |
619 | sockinfo si(sa, PROT_IPv4); |
256 | |
620 | |
257 | if (len > 0) |
621 | if (len > 0) |
258 | { |
622 | { |
259 | pkt->len = len; |
623 | pkt->len = len; |
260 | |
624 | |
|
|
625 | // raw sockets deliver the ipv4 header, but don't expect it on sends |
|
|
626 | pkt->skip_hdr (pkt->ipv4_hdr_len ()); |
|
|
627 | |
261 | recv_vpn_packet (pkt, si); |
628 | recv_vpn_packet (pkt, si); |
262 | } |
629 | } |
263 | else |
630 | else |
264 | { |
631 | { |
265 | // probably ECONNRESET or somesuch |
632 | // probably ECONNRESET or somesuch |
266 | slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno)); |
633 | slog (L_DEBUG, _("%s: %s."), (const char *)si, strerror (errno)); |
267 | } |
634 | } |
268 | |
635 | |
269 | delete pkt; |
636 | delete pkt; |
270 | } |
637 | } |
271 | else if (revents & POLLHUP) |
|
|
272 | { |
|
|
273 | // this cannot ;) happen on udp sockets |
|
|
274 | slog (L_ERR, _("FATAL: POLLHUP on udp v4 fd, terminating.")); |
|
|
275 | exit (1); |
|
|
276 | } |
|
|
277 | else |
638 | else |
278 | { |
639 | { |
279 | slog (L_ERR, |
640 | slog (L_ERR, |
280 | _("FATAL: unknown revents %08x in socket, terminating\n"), |
641 | _("FATAL: unknown revents %08x in socket, exiting.\n"), |
281 | revents); |
642 | revents); |
282 | exit (1); |
643 | exit (EXIT_FAILURE); |
283 | } |
644 | } |
284 | } |
645 | } |
285 | |
646 | |
286 | void |
647 | #if ENABLE_ICMP |
|
|
648 | inline void |
287 | vpn::ipv4_ev (io_watcher &w, short revents) |
649 | vpn::icmpv4_ev (ev::io &w, int revents) |
288 | { |
650 | { |
289 | if (revents & (POLLIN | POLLERR)) |
651 | if (revents & EV_READ) |
290 | { |
652 | { |
291 | vpn_packet *pkt = new vpn_packet; |
653 | vpn_packet *pkt = new vpn_packet; |
292 | struct sockaddr_in sa; |
654 | struct sockaddr_in sa; |
293 | socklen_t sa_len = sizeof (sa); |
655 | socklen_t sa_len = sizeof (sa); |
294 | int len; |
656 | int len; |
295 | |
657 | |
296 | len = recvfrom (w.p->fd, &((*pkt)[0]), MAXSIZE, 0, (sockaddr *)&sa, &sa_len); |
658 | len = recvfrom (w.fd, &((*pkt)[0]), MAXSIZE, 0, (sockaddr *)&sa, &sa_len); |
297 | |
659 | |
298 | sockinfo si(sa, PROT_IPv4); |
660 | sockinfo si(sa, PROT_ICMPv4); |
299 | |
661 | |
300 | if (len > 0) |
662 | if (len > 0) |
301 | { |
663 | { |
302 | pkt->len = len; |
664 | pkt->len = len; |
303 | |
665 | |
|
|
666 | icmp_header *hdr = (icmp_header *)&((*pkt)[IP_OVERHEAD]); |
|
|
667 | |
|
|
668 | if (hdr->type == ::conf.icmp_type |
|
|
669 | && hdr->code == 255) |
|
|
670 | { |
304 | // raw sockets deliver the ipv4, but don't expect it on sends |
671 | // raw sockets deliver the ipv4, but don't expect it on sends |
305 | // this is slow, but... |
672 | // this is slow, but... |
306 | pkt->skip_hdr (IP_OVERHEAD); |
673 | pkt->skip_hdr (pkt->ipv4_hdr_len () + (ICMP_OVERHEAD - IP_OVERHEAD)); |
307 | |
674 | |
308 | recv_vpn_packet (pkt, si); |
675 | recv_vpn_packet (pkt, si); |
|
|
676 | } |
309 | } |
677 | } |
310 | else |
678 | else |
311 | { |
679 | { |
312 | // probably ECONNRESET or somesuch |
680 | // probably ECONNRESET or somesuch |
313 | slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno)); |
681 | slog (L_DEBUG, _("%s: %s."), (const char *)si, strerror (errno)); |
314 | } |
682 | } |
315 | |
683 | |
316 | delete pkt; |
684 | delete pkt; |
317 | } |
685 | } |
318 | else if (revents & POLLHUP) |
|
|
319 | { |
|
|
320 | // this cannot ;) happen on udp sockets |
|
|
321 | slog (L_ERR, _("FATAL: POLLHUP on ipv4 fd, terminating.")); |
|
|
322 | exit (1); |
|
|
323 | } |
|
|
324 | else |
686 | else |
325 | { |
687 | { |
326 | slog (L_ERR, |
688 | slog (L_ERR, |
327 | _("FATAL: unknown revents %08x in socket, terminating\n"), |
689 | _("FATAL: unknown revents %08x in socket, exiting.\n"), |
328 | revents); |
690 | revents); |
329 | exit (1); |
691 | exit (EXIT_FAILURE); |
330 | } |
|
|
331 | } |
|
|
332 | |
|
|
333 | #if ENABLE_TCP |
|
|
334 | |
|
|
335 | struct tcp_connection; |
|
|
336 | |
|
|
337 | struct lt_sockinfo |
|
|
338 | { |
|
|
339 | bool operator()(const sockinfo *a, const sockinfo *b) const |
|
|
340 | { |
|
|
341 | return *a < *b; |
|
|
342 | } |
|
|
343 | }; |
|
|
344 | |
|
|
345 | struct tcp_si_map : public map<const sockinfo *, tcp_connection *, lt_sockinfo> { |
|
|
346 | void cleaner_cb (time_watcher &w); time_watcher cleaner; |
|
|
347 | |
|
|
348 | tcp_si_map () |
|
|
349 | : cleaner(this, &tcp_si_map::cleaner_cb) |
|
|
350 | { |
|
|
351 | cleaner.start (0); |
|
|
352 | } |
|
|
353 | } tcp_si; |
|
|
354 | |
|
|
355 | struct tcp_connection : io_watcher { |
|
|
356 | tstamp last_activity; |
|
|
357 | const sockinfo si; |
|
|
358 | vpn &v; |
|
|
359 | bool ok; |
|
|
360 | |
|
|
361 | vpn_packet *r_pkt; |
|
|
362 | u32 r_len, r_ofs; |
|
|
363 | |
|
|
364 | void tcpv4_ev (io_watcher &w, short revents); |
|
|
365 | |
|
|
366 | operator tcp_si_map::value_type() |
|
|
367 | { |
|
|
368 | return tcp_si_map::value_type (&si, this); |
|
|
369 | } |
|
|
370 | |
|
|
371 | tcp_connection (int fd, const sockinfo &si_, vpn &v_) |
|
|
372 | : v(v_), si(si_), io_watcher(this, &tcp_connection::tcpv4_ev) |
|
|
373 | { |
|
|
374 | last_activity = NOW; |
|
|
375 | ok = false; |
|
|
376 | r_pkt = 0; |
|
|
377 | start (fd, POLLOUT); |
|
|
378 | } |
|
|
379 | |
|
|
380 | ~tcp_connection () { if (p) close (p->fd); } |
|
|
381 | }; |
|
|
382 | |
|
|
383 | void tcp_si_map::cleaner_cb (time_watcher &w) |
|
|
384 | { |
|
|
385 | w.at = NOW + 600; |
|
|
386 | tstamp to = NOW - ::conf.keepalive - 30; |
|
|
387 | |
|
|
388 | for (iterator i = begin (); i != end(); ) |
|
|
389 | if (i->second->last_activity >= to) |
|
|
390 | ++i; |
|
|
391 | else |
|
|
392 | { |
|
|
393 | erase (i); |
|
|
394 | i = begin (); |
|
|
395 | } |
692 | } |
396 | } |
693 | } |
|
|
694 | #endif |
397 | |
695 | |
398 | void |
696 | inline void |
399 | vpn::send_tcpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
697 | vpn::udpv4_ev (ev::io &w, int revents) |
400 | { |
698 | { |
401 | tcp_si_map::iterator info = tcp_si.find (&si); |
699 | if (revents & EV_READ) |
402 | |
|
|
403 | if (info == tcp_si.end ()) |
|
|
404 | { |
|
|
405 | // woaw, the first lost packet ;) |
|
|
406 | int fd = socket (PF_INET, SOCK_STREAM, IPPROTO_TCP); |
|
|
407 | |
|
|
408 | if (fd >= 0) |
|
|
409 | { |
|
|
410 | fcntl (fd, F_SETFL, O_NONBLOCK); |
|
|
411 | |
|
|
412 | if (connect (fd, si.sav4 (), si.salenv4 ()) >= 0 |
|
|
413 | || errno == EINPROGRESS) |
|
|
414 | { |
|
|
415 | tcp_connection *i = new tcp_connection (fd, si, *this); |
|
|
416 | |
|
|
417 | tcp_si.insert (*i); |
|
|
418 | } |
|
|
419 | else |
|
|
420 | close (fd); |
|
|
421 | } |
|
|
422 | } |
700 | { |
423 | else |
|
|
424 | { |
|
|
425 | tcp_connection *i = info->second; |
|
|
426 | |
|
|
427 | i->last_activity = NOW; |
|
|
428 | |
|
|
429 | if (i->ok) |
|
|
430 | { |
|
|
431 | setsockopt (i->p->fd, SOL_IP, IP_TOS, &tos, sizeof tos); |
|
|
432 | |
|
|
433 | // we use none of the advantages of tcp |
|
|
434 | write (i->p->fd, (void *)pkt, pkt->len + sizeof (u32)) != pkt->len + sizeof (u32); |
|
|
435 | } |
|
|
436 | } |
|
|
437 | |
|
|
438 | #if 0 |
|
|
439 | setsockopt (udpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos); |
|
|
440 | sendto (udpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ()); |
|
|
441 | #endif |
|
|
442 | } |
|
|
443 | |
|
|
444 | void |
|
|
445 | tcp_connection::tcpv4_ev (io_watcher &w, short revents) |
|
|
446 | { |
|
|
447 | last_activity = NOW; |
|
|
448 | |
|
|
449 | if (!ok) // just established? |
|
|
450 | { |
|
|
451 | ok = true; |
|
|
452 | set (POLLIN); |
|
|
453 | } |
|
|
454 | |
|
|
455 | if (revents & (POLLIN | POLLERR)) |
|
|
456 | { |
|
|
457 | u32 len; |
|
|
458 | |
|
|
459 | if (sizeof (len) == read (p->fd, &len, sizeof (len))) |
|
|
460 | { |
|
|
461 | vpn_packet *pkt = new vpn_packet; |
701 | vpn_packet *pkt = new vpn_packet; |
462 | |
|
|
463 | if (len == read (p->fd, &((*pkt)[0]), len)) |
|
|
464 | { |
|
|
465 | pkt->len = len; |
|
|
466 | |
|
|
467 | v.recv_vpn_packet (pkt, si); |
|
|
468 | return; |
|
|
469 | } |
|
|
470 | |
|
|
471 | delete pkt; |
|
|
472 | } |
|
|
473 | |
|
|
474 | tcp_si.erase (&si); |
|
|
475 | |
|
|
476 | set (0);//D |
|
|
477 | } |
|
|
478 | } |
|
|
479 | |
|
|
480 | void |
|
|
481 | vpn::tcpv4_ev (io_watcher &w, short revents) |
|
|
482 | { |
|
|
483 | if (revents & (POLLIN | POLLERR)) |
|
|
484 | { |
|
|
485 | struct sockaddr_in sa; |
702 | struct sockaddr_in sa; |
486 | socklen_t sa_len = sizeof (sa); |
703 | socklen_t sa_len = sizeof (sa); |
487 | int len; |
704 | int len; |
488 | |
705 | |
489 | int fd = accept (w.p->fd, (sockaddr *)&sa, &sa_len); |
706 | len = recvfrom (w.fd, &((*pkt)[0]), MAXSIZE, 0, (sockaddr *)&sa, &sa_len); |
490 | |
707 | |
491 | if (fd >= 0) |
|
|
492 | { |
|
|
493 | fcntl (fd, F_SETFL, O_NONBLOCK); |
|
|
494 | |
|
|
495 | sockinfo si(sa, PROT_TCPv4); |
708 | sockinfo si(sa, PROT_UDPv4); |
496 | tcp_connection *i = new tcp_connection (fd, si, *this); |
|
|
497 | |
709 | |
498 | slog (L_DEBUG, _("accepted tcp connection from %s\n"), (const char *)si);//D |
710 | if (len > 0) |
499 | |
|
|
500 | tcp_si.insert (*i); |
|
|
501 | } |
711 | { |
|
|
712 | pkt->len = len; |
|
|
713 | |
|
|
714 | recv_vpn_packet (pkt, si); |
|
|
715 | } |
|
|
716 | else |
|
|
717 | { |
|
|
718 | // probably ECONNRESET or somesuch |
|
|
719 | slog (L_DEBUG, _("%s: fd %d, %s."), (const char *)si, w.fd, strerror (errno)); |
|
|
720 | } |
|
|
721 | |
|
|
722 | delete pkt; |
|
|
723 | } |
|
|
724 | else |
502 | } |
725 | { |
|
|
726 | slog (L_ERR, |
|
|
727 | _("FATAL: unknown revents %08x in socket, exiting.\n"), |
|
|
728 | revents); |
|
|
729 | exit (EXIT_FAILURE); |
|
|
730 | } |
503 | } |
731 | } |
504 | |
732 | |
505 | #endif |
733 | inline void |
506 | |
|
|
507 | void |
|
|
508 | vpn::tap_ev (io_watcher &w, short revents) |
734 | vpn::tap_ev (ev::io &w, int revents) |
509 | { |
735 | { |
510 | if (revents & POLLIN) |
736 | if (revents & EV_READ) |
511 | { |
737 | { |
512 | /* process data */ |
738 | /* process data */ |
513 | tap_packet *pkt; |
739 | tap_packet *pkt; |
514 | |
740 | |
515 | pkt = tap->recv (); |
741 | pkt = tap->recv (); |
516 | |
742 | |
|
|
743 | if (!pkt) |
|
|
744 | return; |
|
|
745 | |
|
|
746 | if (pkt->len > 14) |
|
|
747 | { |
517 | int dst = mac2id (pkt->dst); |
748 | int dst = mac2id (pkt->dst); |
518 | int src = mac2id (pkt->src); |
749 | int src = mac2id (pkt->src); |
519 | |
750 | |
520 | if (src != THISNODE->id) |
751 | if (src != THISNODE->id) |
521 | { |
|
|
522 | slog (L_ERR, _("FATAL: tap packet not originating on current node received, terminating.")); |
|
|
523 | exit (1); |
|
|
524 | } |
|
|
525 | |
|
|
526 | if (dst == THISNODE->id) |
|
|
527 | { |
|
|
528 | slog (L_ERR, _("FATAL: tap packet destined for current node received, terminating.")); |
|
|
529 | exit (1); |
|
|
530 | } |
|
|
531 | |
|
|
532 | if (dst > conns.size ()) |
|
|
533 | slog (L_ERR, _("tap packet for unknown node %d received, ignoring."), dst); |
|
|
534 | else |
|
|
535 | { |
|
|
536 | if (dst) |
|
|
537 | { |
752 | { |
538 | // unicast |
753 | slog (L_ERR, _("FATAL: tap packet not originating on current node received (if-up script not working properly?), exiting.")); |
539 | if (dst != THISNODE->id) |
754 | exit (EXIT_FAILURE); |
540 | conns[dst - 1]->inject_data_packet (pkt); |
|
|
541 | } |
755 | } |
|
|
756 | |
|
|
757 | if (dst == THISNODE->id) |
|
|
758 | { |
|
|
759 | slog (L_ERR, _("FATAL: tap packet destined for current node received, exiting.")); |
|
|
760 | exit (EXIT_FAILURE); |
|
|
761 | } |
|
|
762 | |
|
|
763 | if (dst > conns.size ()) |
|
|
764 | slog (L_ERR, _("tap packet for unknown node %d received, ignoring."), dst); |
542 | else |
765 | else |
543 | { |
|
|
544 | // broadcast, first check router, then self, then english |
|
|
545 | connection *router = find_router (); |
|
|
546 | |
|
|
547 | if (router) |
|
|
548 | router->inject_data_packet (pkt, true); |
766 | inject_data_packet (pkt, dst); |
549 | else |
|
|
550 | for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c) |
|
|
551 | if ((*c)->conf != THISNODE) |
|
|
552 | (*c)->inject_data_packet (pkt); |
|
|
553 | } |
|
|
554 | } |
767 | } |
555 | |
768 | |
556 | delete pkt; |
769 | delete pkt; |
557 | } |
|
|
558 | else if (revents & (POLLHUP | POLLERR)) |
|
|
559 | { |
|
|
560 | slog (L_ERR, _("FATAL: POLLHUP or POLLERR on network device fd, terminating.")); |
|
|
561 | exit (1); |
|
|
562 | } |
770 | } |
563 | else |
771 | else |
564 | abort (); |
772 | abort (); |
565 | } |
773 | } |
566 | |
774 | |
567 | void |
775 | inline void |
568 | vpn::event_cb (time_watcher &w) |
776 | vpn::event_cb (ev::timer &w, int) |
569 | { |
777 | { |
570 | if (events) |
778 | if (events) |
571 | { |
779 | { |
572 | if (events & EVENT_SHUTDOWN) |
780 | if (events & EVENT_SHUTDOWN) |
573 | { |
781 | { |
574 | slog (L_INFO, _("preparing shutdown...")); |
782 | slog (L_INFO, _("preparing shutdown...")); |
575 | |
783 | |
576 | shutdown_all (); |
784 | shutdown_all (); |
577 | |
|
|
578 | remove_pid (pidfilename); |
785 | remove_pid (conf.pidfilename); |
579 | |
|
|
580 | slog (L_INFO, _("terminating")); |
786 | slog (L_INFO, _("exiting.")); |
581 | |
787 | exit (EXIT_SUCCESS); |
582 | exit (0); |
|
|
583 | } |
788 | } |
584 | |
789 | |
585 | if (events & EVENT_RECONNECT) |
790 | if (events & EVENT_RECONNECT) |
586 | { |
791 | { |
587 | slog (L_INFO, _("forced reconnect")); |
792 | slog (L_INFO, _("forced reconnect.")); |
588 | |
793 | |
589 | reconnect_all (); |
794 | reconnect_all (); |
590 | } |
795 | } |
591 | |
796 | |
592 | events = 0; |
797 | events = 0; |
593 | } |
798 | } |
594 | |
|
|
595 | w.at = TSTAMP_CANCEL; |
|
|
596 | } |
799 | } |
597 | |
800 | |
598 | void |
801 | void |
599 | vpn::shutdown_all () |
802 | vpn::shutdown_all () |
600 | { |
803 | { |
… | |
… | |
610 | |
813 | |
611 | conns.clear (); |
814 | conns.clear (); |
612 | |
815 | |
613 | connection_init (); |
816 | connection_init (); |
614 | |
817 | |
615 | for (configuration::node_vector::iterator i = conf.nodes.begin (); |
818 | for (configuration::node_vector::iterator i = conf.nodes.begin (); i != conf.nodes.end (); ++i) |
616 | i != conf.nodes.end (); ++i) |
819 | conns.push_back (new connection (this, *i)); |
617 | { |
|
|
618 | connection *conn = new connection (this); |
|
|
619 | |
820 | |
620 | conn->conf = *i; |
821 | for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c) |
621 | conns.push_back (conn); |
|
|
622 | |
|
|
623 | conn->establish_connection (); |
822 | (*c)->establish_connection (); |
624 | } |
|
|
625 | } |
823 | } |
626 | |
824 | |
627 | connection *vpn::find_router () |
825 | bool |
|
|
826 | vpn::can_direct (conf_node *src, conf_node *dst) const |
628 | { |
827 | { |
629 | u32 prio = 0; |
828 | return src != dst |
|
|
829 | && src->may_direct (dst) |
|
|
830 | && dst->may_direct (src) |
|
|
831 | && (((src->protocols & dst->protocols) && src->connectmode == conf_node::C_ALWAYS) |
|
|
832 | || (src->protocols & dst->connectable_protocols ())); |
|
|
833 | } |
|
|
834 | |
|
|
835 | // only works for indirect and routed connections: find a router |
|
|
836 | // from THISNODE to dst |
|
|
837 | connection * |
|
|
838 | vpn::find_router_for (const connection *dst) |
|
|
839 | { |
630 | connection *router = 0; |
840 | connection *router = 0; |
631 | |
841 | |
|
|
842 | // first try to find a router with a direct connection, route there |
|
|
843 | // regardless of any other considerations. |
|
|
844 | { |
|
|
845 | u32 prio = 1; |
|
|
846 | |
|
|
847 | for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i) |
|
|
848 | { |
|
|
849 | connection *c = *i; |
|
|
850 | |
|
|
851 | if (c->conf->routerprio > prio |
|
|
852 | && c->conf != THISNODE |
|
|
853 | && can_direct (c->conf, dst->conf) |
|
|
854 | && c->ictx && c->octx) |
|
|
855 | { |
|
|
856 | prio = c->conf->routerprio; |
|
|
857 | router = c; |
|
|
858 | } |
|
|
859 | } |
|
|
860 | } |
|
|
861 | |
|
|
862 | if (router) |
|
|
863 | return router; |
|
|
864 | |
|
|
865 | // second try find the router with the highest priority, higher than ours |
|
|
866 | { |
|
|
867 | u32 prio = THISNODE->routerprio ? THISNODE->routerprio : 1; |
|
|
868 | |
|
|
869 | for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i) |
|
|
870 | { |
|
|
871 | connection *c = *i; |
|
|
872 | |
|
|
873 | if (c->conf->routerprio > prio |
|
|
874 | && c != dst |
|
|
875 | && c->conf != THISNODE |
|
|
876 | && c->ictx && c->octx) |
|
|
877 | { |
|
|
878 | prio = c->conf->routerprio; |
|
|
879 | router = c; |
|
|
880 | } |
|
|
881 | } |
|
|
882 | } |
|
|
883 | |
|
|
884 | return router; |
|
|
885 | } |
|
|
886 | |
|
|
887 | void |
|
|
888 | vpn::connection_established (connection *c) |
|
|
889 | { |
632 | for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i) |
890 | for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i) |
633 | { |
891 | { |
634 | connection *c = *i; |
892 | connection *o = *i; |
635 | |
893 | |
636 | if (c->conf->routerprio > prio |
894 | if (!o->is_direct |
637 | && c->connectmode == conf_node::C_ALWAYS |
895 | && o->si.valid () |
638 | && c->conf != THISNODE |
896 | && c->si != o->si |
639 | && c->ictx && c->octx) |
897 | && c == find_router_for (o)) |
640 | { |
|
|
641 | prio = c->conf->routerprio; |
|
|
642 | router = c; |
|
|
643 | } |
898 | { |
|
|
899 | slog (L_DEBUG, _("%s: can now route packets via %s, re-keying connection."), |
|
|
900 | o->conf->nodename, c->conf->nodename); |
|
|
901 | o->rekey (); |
|
|
902 | } |
644 | } |
903 | } |
645 | |
|
|
646 | return router; |
|
|
647 | } |
904 | } |
648 | |
905 | |
649 | void vpn::connect_request (int id) |
906 | void |
|
|
907 | vpn::send_connect_request (connection *c) |
650 | { |
908 | { |
651 | connection *c = find_router (); |
909 | connection *r = find_router_for (c); |
652 | |
910 | |
653 | if (c) |
911 | if (r) |
|
|
912 | { |
|
|
913 | slog (L_TRACE, _("%s: no address known, sending mediated connection request via %s."), |
|
|
914 | c->conf->nodename, r->conf->nodename); |
654 | c->connect_request (id); |
915 | r->send_connect_request (c->conf->id); |
655 | //else // does not work, because all others must connect to the same router |
916 | } |
656 | // // no router found, aggressively connect to all routers |
917 | else |
657 | // for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i) |
918 | slog (L_DEBUG, _("%s: no way to connect and no router found: unable to connect at this time."), |
658 | // if ((*i)->conf->routerprio) |
919 | c->conf->nodename); |
659 | // (*i)->establish_connection (); |
|
|
660 | } |
920 | } |
661 | |
921 | |
662 | void |
922 | void |
663 | connection::dump_status () |
923 | connection::dump_status () |
664 | { |
924 | { |
665 | slog (L_NOTICE, _("node %s (id %d)"), conf->nodename, conf->id); |
925 | slog (L_NOTICE, _("node %s (id %d)"), conf->nodename, conf->id); |
666 | slog (L_NOTICE, _(" connectmode %d (%d) / sockaddr %s / minor %d"), |
926 | slog (L_NOTICE, _(" connectmode %d (%d) / sockaddr %s / minor %d"), |
667 | connectmode, conf->connectmode, (const char *)si, (int)prot_minor); |
927 | connectmode, conf->connectmode, (const char *)si, (int)prot_minor); |
668 | slog (L_NOTICE, _(" ictx/octx %08lx/%08lx / oseqno %d / retry_cnt %d"), |
928 | slog (L_NOTICE, _(" ictx/octx %08lx/%08lx / oseqno %d / retry_cnt %d"), |
669 | (long)ictx, (long)octx, (int)oseqno, (int)retry_cnt); |
929 | (long)ictx, (long)octx, (int)oseqno, (int)retry_cnt); |
670 | slog (L_NOTICE, _(" establish_conn %ld / rekey %ld / keepalive %ld"), |
|
|
671 | (long)(establish_connection.at), (long)(rekey.at), (long)(keepalive.at)); |
|
|
672 | } |
930 | } |
673 | |
931 | |
674 | void |
932 | void |
675 | vpn::dump_status () |
933 | vpn::dump_status () |
676 | { |
934 | { |
677 | slog (L_NOTICE, _("BEGIN status dump (%ld)"), (long)NOW); |
935 | slog (L_NOTICE, _("BEGIN status dump (%ld)"), (long)ev_now ()); |
678 | |
936 | |
679 | for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c) |
937 | for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c) |
680 | (*c)->dump_status (); |
938 | (*c)->dump_status (); |
681 | |
939 | |
682 | slog (L_NOTICE, _("END status dump")); |
940 | slog (L_NOTICE, _("END status dump")); |
683 | } |
941 | } |
684 | |
942 | |
685 | vpn::vpn (void) |
943 | vpn::vpn (void) |
686 | : event(this, &vpn::event_cb) |
944 | { |
|
|
945 | event .set<vpn, &vpn::event_cb > (this); |
687 | , udpv4_ev_watcher(this, &vpn::udpv4_ev) |
946 | udpv4_ev_watcher .set<vpn, &vpn::udpv4_ev > (this); |
688 | , ipv4_ev_watcher (this, &vpn::ipv4_ev) |
947 | ipv4_ev_watcher .set<vpn, &vpn::ipv4_ev > (this); |
689 | , tap_ev_watcher (this, &vpn::tap_ev) |
|
|
690 | #if ENABLE_TCP |
948 | #if ENABLE_TCP |
691 | , tcpv4_ev_watcher(this, &vpn::tcpv4_ev) |
949 | tcpv4_ev_watcher .set<vpn, &vpn::tcpv4_ev > (this); |
692 | #endif |
950 | #endif |
693 | { |
951 | #if ENABLE_ICMP |
|
|
952 | icmpv4_ev_watcher.set<vpn, &vpn::icmpv4_ev> (this); |
|
|
953 | #endif |
|
|
954 | #if ENABLE_DNS |
|
|
955 | dnsv4_ev_watcher .set<vpn, &vpn::dnsv4_ev > (this); |
|
|
956 | #endif |
|
|
957 | tap_ev_watcher .set<vpn, &vpn::tap_ev > (this); |
694 | } |
958 | } |
695 | |
959 | |
696 | vpn::~vpn () |
960 | vpn::~vpn () |
697 | { |
961 | { |
698 | } |
962 | } |