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> |
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43 | #include <sys/stat.h> |
31 | #include <errno.h> |
44 | #include <errno.h> |
32 | #include <time.h> |
45 | #include <time.h> |
33 | #include <unistd.h> |
46 | #include <unistd.h> |
34 | #include <fcntl.h> |
47 | #include <fcntl.h> |
35 | #include <arpa/inet.h> |
48 | #include <sys/socket.h> |
36 | #include <netinet/in.h> |
49 | |
37 | #include <netinet/ip_icmp.h> |
50 | #include "netcompat.h" |
38 | |
51 | |
39 | #include "pidfile.h" |
52 | #include "pidfile.h" |
40 | |
53 | |
41 | #include "connection.h" |
54 | #include "connection.h" |
42 | #include "util.h" |
55 | #include "util.h" |
43 | #include "vpn.h" |
56 | #include "vpn.h" |
44 | |
57 | |
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58 | using namespace std; |
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59 | |
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60 | vpn network; // THE vpn (bad design...) |
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61 | |
45 | ///////////////////////////////////////////////////////////////////////////// |
62 | ///////////////////////////////////////////////////////////////////////////// |
46 | |
63 | |
47 | 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 () |
48 | { |
78 | { |
49 | // the tunnel device mtu should be the physical mtu - overhead |
79 | // the tunnel device mtu should be the physical mtu - overhead |
50 | // the tricky part is rounding to the cipher key blocksize |
80 | // the tricky part is rounding to the cipher key blocksize |
51 | int mtu = conf.mtu - ETH_OVERHEAD - VPE_OVERHEAD - MAX_OVERHEAD; |
81 | int mtu = conf.mtu - ETH_OVERHEAD - VPE_OVERHEAD - MAX_OVERHEAD; |
52 | mtu += ETH_OVERHEAD - 6 - 6; // now we have the data portion |
82 | mtu += ETH_OVERHEAD - 6 - 6; // now we have the data portion |
53 | mtu -= mtu % EVP_CIPHER_block_size (CIPHER); // round |
83 | mtu -= mtu % BLOCK_SIZE (CIPHER); // round |
54 | mtu -= ETH_OVERHEAD - 6 - 6; // and get interface mtu again |
84 | mtu -= ETH_OVERHEAD - 6 - 6; // and get interface mtu again |
55 | |
85 | |
56 | char *env; |
86 | char *env; |
57 | asprintf (&env, "CONFBASE=%s", confbase); |
87 | asprintf (&env, "CONFBASE=%s", confbase); putenv (env); |
58 | putenv (env); |
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59 | asprintf (&env, "NODENAME=%s", THISNODE->nodename); |
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60 | putenv (env); |
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61 | asprintf (&env, "NODEID=%d", THISNODE->id); |
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62 | putenv (env); |
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63 | asprintf (&env, "IFNAME=%s", tap->interface ()); |
88 | asprintf (&env, "IFNAME=%s", tap->interface ()); putenv (env); |
64 | putenv (env); |
89 | asprintf (&env, "IFTYPE=%s", IFTYPE); putenv (env); |
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90 | asprintf (&env, "IFSUBTYPE=%s", IFSUBTYPE); putenv (env); |
65 | asprintf (&env, "MTU=%d", mtu); |
91 | asprintf (&env, "MTU=%d", mtu); putenv (env); |
66 | putenv (env); |
92 | asprintf (&env, "NODES=%d", conns.size ()); putenv (env); |
67 | asprintf (&env, "MAC=%02x:%02x:%02x:%02x:%02x:%02x", |
93 | asprintf (&env, "NODEID=%d", THISNODE->id); putenv (env); |
68 | 0xfe, 0xfd, 0x80, 0x00, THISNODE->id >> 8, |
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69 | THISNODE->id & 0xff); |
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70 | putenv (env); |
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71 | |
94 | |
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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 | char *filename; |
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119 | asprintf (&filename, |
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120 | "%s/%s", |
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121 | confbase, |
72 | return ::conf.script_if_up ? ::conf.script_if_up : "if-up"; |
122 | ::conf.script_if_up ? ::conf.script_if_up : "if-up"); |
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123 | |
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124 | return filename; |
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125 | } |
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126 | |
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127 | int |
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128 | vpn::setup_socket (u8 prot, int family, int type, int proto) |
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129 | { |
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130 | int fd = socket (family, type, proto); |
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131 | |
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132 | if (fd < 0) |
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133 | { |
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134 | slog (L_ERR, _("unable to create %s socket: %s."), strprotocol (prot), strerror (errno)); |
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135 | return fd; |
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136 | } |
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137 | |
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138 | fcntl (fd, F_SETFL, O_NONBLOCK); |
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139 | fcntl (fd, F_SETFD, FD_CLOEXEC); |
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140 | |
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141 | #ifdef SO_MARK |
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142 | if (::conf.nfmark) |
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143 | if (setsockopt (fd, SOL_SOCKET, SO_MARK, &::conf.nfmark, sizeof ::conf.nfmark)) |
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144 | slog (L_WARN, _("unable to set nfmark on %s socket: %s"), strprotocol (prot), strerror (errno)); |
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145 | #endif |
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146 | |
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147 | return fd; |
73 | } |
148 | } |
74 | |
149 | |
75 | int |
150 | int |
76 | vpn::setup () |
151 | vpn::setup () |
77 | { |
152 | { |
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153 | int success = 0; |
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154 | |
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155 | ipv4_tos = -1; |
78 | ipv4_fd = -1; |
156 | ipv4_fd = -1; |
79 | |
157 | |
80 | if (THISNODE->protocols & PROT_IPv4 && ::conf.ip_proto) |
158 | if (THISNODE->protocols & PROT_IPv4 && ::conf.ip_proto) |
81 | { |
159 | { |
82 | ipv4_fd = socket (PF_INET, SOCK_RAW, ::conf.ip_proto); |
160 | ipv4_fd = setup_socket (PROT_IPv4, PF_INET, SOCK_RAW, ::conf.ip_proto); |
83 | |
161 | |
84 | if (ipv4_fd < 0) |
162 | if (ipv4_fd < 0) |
85 | return -1; |
163 | return -1; |
86 | |
164 | |
87 | fcntl (ipv4_fd, F_SETFL, O_NONBLOCK); |
165 | #if defined(SOL_IP) && defined(IP_MTU_DISCOVER) |
88 | |
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89 | #ifdef IP_MTU_DISCOVER |
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90 | // this I really consider a linux bug. I am neither connected |
166 | // this I really consider a linux bug. I am neither connected |
91 | // nor do I fragment myself. Linux still sets DF and doesn't |
167 | // nor do I fragment myself. Linux still sets DF and doesn't |
92 | // fragment for me sometimes. |
168 | // fragment for me sometimes. |
93 | { |
169 | { |
94 | int oval = IP_PMTUDISC_DONT; |
170 | int oval = IP_PMTUDISC_DONT; |
… | |
… | |
98 | |
174 | |
99 | sockinfo si (THISNODE, PROT_IPv4); |
175 | sockinfo si (THISNODE, PROT_IPv4); |
100 | |
176 | |
101 | if (bind (ipv4_fd, si.sav4 (), si.salenv4 ())) |
177 | if (bind (ipv4_fd, si.sav4 (), si.salenv4 ())) |
102 | { |
178 | { |
103 | slog (L_ERR, _("can't bind ipv4 socket on %s: %s"), (const char *)si, strerror (errno)); |
179 | slog (L_ERR, _("can't bind ipv4 socket on %s: %s, exiting."), (const char *)si, strerror (errno)); |
104 | exit (1); |
180 | return -1; |
105 | } |
181 | } |
106 | |
182 | |
107 | ipv4_ev_watcher.start (ipv4_fd, POLLIN); |
183 | ipv4_ev_watcher.start (ipv4_fd, EV_READ); |
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184 | ++success; |
108 | } |
185 | } |
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186 | else |
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187 | THISNODE->protocols &= ~PROT_IPv4; |
109 | |
188 | |
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189 | udpv4_tos = -1; |
110 | udpv4_fd = -1; |
190 | udpv4_fd = -1; |
111 | |
191 | |
112 | if (THISNODE->protocols & PROT_UDPv4 && THISNODE->udp_port) |
192 | if (THISNODE->protocols & PROT_UDPv4 && THISNODE->udp_port) |
113 | { |
193 | { |
114 | udpv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP); |
194 | udpv4_fd = setup_socket (PROT_UDPv4, PF_INET, SOCK_DGRAM, IPPROTO_UDP); |
115 | |
195 | |
116 | if (udpv4_fd < 0) |
196 | if (udpv4_fd < 0) |
117 | return -1; |
197 | return -1; |
118 | |
198 | |
119 | fcntl (udpv4_fd, F_SETFL, O_NONBLOCK); |
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120 | |
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121 | // standard daemon practise... |
199 | // standard daemon practise... |
122 | { |
200 | { |
123 | int oval = 1; |
201 | int oval = 1; |
124 | setsockopt (udpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval); |
202 | setsockopt (udpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval); |
125 | } |
203 | } |
126 | |
204 | |
127 | #ifdef IP_MTU_DISCOVER |
205 | #if defined(SOL_IP) && defined(IP_MTU_DISCOVER) |
128 | // this I really consider a linux bug. I am neither connected |
206 | // this I really consider a linux bug. I am neither connected |
129 | // nor do I fragment myself. Linux still sets DF and doesn't |
207 | // nor do I fragment myself. Linux still sets DF and doesn't |
130 | // fragment for me sometimes. |
208 | // fragment for me sometimes. |
131 | { |
209 | { |
132 | int oval = IP_PMTUDISC_DONT; |
210 | int oval = IP_PMTUDISC_DONT; |
… | |
… | |
136 | |
214 | |
137 | sockinfo si (THISNODE, PROT_UDPv4); |
215 | sockinfo si (THISNODE, PROT_UDPv4); |
138 | |
216 | |
139 | if (bind (udpv4_fd, si.sav4 (), si.salenv4 ())) |
217 | if (bind (udpv4_fd, si.sav4 (), si.salenv4 ())) |
140 | { |
218 | { |
141 | slog (L_ERR, _("can't bind udpv4 on %s: %s"), (const char *)si, strerror (errno)); |
219 | slog (L_ERR, _("can't bind udpv4 on %s: %s, exiting."), (const char *)si, strerror (errno)); |
142 | exit (1); |
220 | return -1; |
143 | } |
221 | } |
144 | |
222 | |
145 | udpv4_ev_watcher.start (udpv4_fd, POLLIN); |
223 | udpv4_ev_watcher.start (udpv4_fd, EV_READ); |
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224 | ++success; |
146 | } |
225 | } |
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226 | else |
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227 | THISNODE->protocols &= ~PROT_UDPv4; |
147 | |
228 | |
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229 | icmpv4_tos = -1; |
148 | icmpv4_fd = -1; |
230 | icmpv4_fd = -1; |
149 | |
231 | |
150 | #if ENABLE_ICMP |
232 | #if ENABLE_ICMP |
151 | if (THISNODE->protocols & PROT_ICMPv4) |
233 | if (THISNODE->protocols & PROT_ICMPv4) |
152 | { |
234 | { |
153 | icmpv4_fd = socket (PF_INET, SOCK_RAW, IPPROTO_ICMP); |
235 | icmpv4_fd = setup_socket (PROT_ICMPv4, PF_INET, SOCK_RAW, IPPROTO_ICMP); |
154 | |
236 | |
155 | if (icmpv4_fd < 0) |
237 | if (icmpv4_fd < 0) |
156 | return -1; |
238 | return -1; |
157 | |
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158 | fcntl (icmpv4_fd, F_SETFL, O_NONBLOCK); |
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159 | |
239 | |
160 | #ifdef ICMP_FILTER |
240 | #ifdef ICMP_FILTER |
161 | { |
241 | { |
162 | icmp_filter oval; |
242 | icmp_filter oval; |
163 | oval.data = 0xffffffff; |
243 | oval.data = 0xffffffff; |
… | |
… | |
166 | |
246 | |
167 | setsockopt (icmpv4_fd, SOL_RAW, ICMP_FILTER, &oval, sizeof oval); |
247 | setsockopt (icmpv4_fd, SOL_RAW, ICMP_FILTER, &oval, sizeof oval); |
168 | } |
248 | } |
169 | #endif |
249 | #endif |
170 | |
250 | |
171 | #ifdef IP_MTU_DISCOVER |
251 | #if defined(SOL_IP) && defined(IP_MTU_DISCOVER) |
172 | // this I really consider a linux bug. I am neither connected |
252 | // this I really consider a linux bug. I am neither connected |
173 | // nor do I fragment myself. Linux still sets DF and doesn't |
253 | // nor do I fragment myself. Linux still sets DF and doesn't |
174 | // fragment for me sometimes. |
254 | // fragment for me sometimes. |
175 | { |
255 | { |
176 | int oval = IP_PMTUDISC_DONT; |
256 | int oval = IP_PMTUDISC_DONT; |
177 | setsockopt (udpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval); |
257 | setsockopt (icmpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval); |
178 | } |
258 | } |
179 | #endif |
259 | #endif |
180 | |
260 | |
181 | sockinfo si (THISNODE, PROT_ICMPv4); |
261 | sockinfo si (THISNODE, PROT_ICMPv4); |
182 | |
262 | |
183 | if (bind (icmpv4_fd, si.sav4 (), si.salenv4 ())) |
263 | if (bind (icmpv4_fd, si.sav4 (), si.salenv4 ())) |
184 | { |
264 | { |
185 | slog (L_ERR, _("can't bind icmpv4 on %s: %s"), (const char *)si, strerror (errno)); |
265 | slog (L_ERR, _("can't bind icmpv4 on %s: %s, exiting."), (const char *)si, strerror (errno)); |
186 | exit (1); |
266 | return -1; |
187 | } |
267 | } |
188 | |
268 | |
189 | icmpv4_ev_watcher.start (icmpv4_fd, POLLIN); |
269 | icmpv4_ev_watcher.start (icmpv4_fd, EV_READ); |
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270 | ++success; |
190 | } |
271 | } |
191 | #endif |
272 | #endif |
192 | |
273 | |
193 | tcpv4_fd = -1; |
274 | tcpv4_fd = -1; |
194 | |
275 | |
195 | #if ENABLE_TCP |
276 | #if ENABLE_TCP |
196 | if (THISNODE->protocols & PROT_TCPv4 && THISNODE->tcp_port) |
277 | if (THISNODE->protocols & PROT_TCPv4 && THISNODE->tcp_port) |
197 | { |
278 | { |
198 | tcpv4_fd = socket (PF_INET, SOCK_STREAM, IPPROTO_TCP); |
279 | tcpv4_fd = setup_socket (PROT_TCPv4, PF_INET, SOCK_STREAM, IPPROTO_TCP); |
199 | |
280 | |
200 | if (tcpv4_fd < 0) |
281 | if (tcpv4_fd < 0) |
201 | return -1; |
282 | return -1; |
202 | |
283 | |
203 | fcntl (tcpv4_fd, F_SETFL, O_NONBLOCK); |
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204 | |
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205 | // standard daemon practise... |
284 | // standard daemon practise... |
206 | { |
285 | { |
207 | int oval = 1; |
286 | int oval = 1; |
208 | setsockopt (tcpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval); |
287 | setsockopt (tcpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval); |
209 | } |
288 | } |
210 | |
289 | |
211 | sockinfo si (THISNODE, PROT_TCPv4); |
290 | sockinfo si (THISNODE, PROT_TCPv4); |
212 | |
291 | |
213 | if (bind (tcpv4_fd, si.sav4 (), si.salenv4 ())) |
292 | if (bind (tcpv4_fd, si.sav4 (), si.salenv4 ())) |
214 | { |
293 | { |
215 | slog (L_ERR, _("can't bind tcpv4 on %s: %s"), (const char *)si, strerror (errno)); |
294 | slog (L_ERR, _("can't bind tcpv4 on %s: %s, exiting."), (const char *)si, strerror (errno)); |
216 | exit (1); |
295 | return -1; |
217 | } |
296 | } |
218 | |
297 | |
219 | if (listen (tcpv4_fd, 5)) |
298 | if (listen (tcpv4_fd, 5)) |
220 | { |
299 | { |
221 | slog (L_ERR, _("can't listen tcpv4 on %s: %s"), (const char *)si, strerror (errno)); |
300 | slog (L_ERR, _("can't listen tcpv4 on %s: %s, exiting."), (const char *)si, strerror (errno)); |
222 | exit (1); |
301 | return -1; |
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302 | } |
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303 | |
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304 | tcpv4_ev_watcher.start (tcpv4_fd, EV_READ); |
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305 | ++success; |
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306 | } |
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307 | else |
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308 | THISNODE->protocols &= ~PROT_TCPv4; |
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309 | #endif |
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310 | |
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311 | dnsv4_tos = -1; |
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312 | dnsv4_fd = -1; |
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313 | |
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314 | #if ENABLE_DNS |
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315 | if (THISNODE->protocols & PROT_DNSv4) |
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316 | { |
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317 | dns_forwarder.set (::conf.dns_forw_host, ::conf.dns_forw_port, PROT_DNSv4); |
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318 | |
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319 | dnsv4_fd = setup_socket (PROT_DNSv4, PF_INET, SOCK_DGRAM, IPPROTO_UDP); |
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320 | |
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321 | if (dnsv4_fd < 0) |
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322 | return -1; |
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323 | |
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324 | # if defined(SOL_IP) && defined(IP_MTU_DISCOVER) |
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325 | // this I really consider a linux bug. I am neither connected |
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326 | // nor do I fragment myself. Linux still sets DF and doesn't |
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327 | // fragment for me sometimes. |
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328 | { |
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329 | int oval = IP_PMTUDISC_DONT; |
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330 | setsockopt (dnsv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval); |
223 | } |
331 | } |
224 | |
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225 | tcpv4_ev_watcher.start (tcpv4_fd, POLLIN); |
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226 | } |
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227 | #endif |
332 | # endif |
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333 | |
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334 | // standard daemon practise... |
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335 | { |
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336 | int oval = 1; |
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337 | setsockopt (dnsv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval); |
|
|
338 | } |
|
|
339 | |
|
|
340 | sockinfo si (THISNODE->dns_hostname, |
|
|
341 | THISNODE->dns_hostname ? THISNODE->dns_port : 0, |
|
|
342 | PROT_DNSv4); |
|
|
343 | |
|
|
344 | if (bind (dnsv4_fd, si.sav4 (), si.salenv4 ())) |
|
|
345 | { |
|
|
346 | slog (L_ERR, _("can't bind dnsv4 on %s: %s, exiting."), (const char *)si, strerror (errno)); |
|
|
347 | return -1; |
|
|
348 | } |
|
|
349 | |
|
|
350 | dnsv4_ev_watcher.start (dnsv4_fd, EV_READ); |
|
|
351 | ++success; |
|
|
352 | } |
|
|
353 | #endif |
|
|
354 | |
|
|
355 | ///////////////////////////////////////////////////////////////////////////// |
|
|
356 | |
|
|
357 | if (!success) |
|
|
358 | { |
|
|
359 | slog (L_ERR, _("no protocols enabled.")); |
|
|
360 | return -1; |
|
|
361 | } |
|
|
362 | |
|
|
363 | reconnect_all (); |
|
|
364 | |
|
|
365 | ///////////////////////////////////////////////////////////////////////////// |
228 | |
366 | |
229 | tap = new tap_device (); |
367 | tap = new tap_device (); |
230 | if (!tap) //D this, of course, never catches |
368 | if (!tap) //D this, of course, never catches |
231 | { |
369 | { |
232 | slog (L_ERR, _("cannot create network interface '%s'"), conf.ifname); |
370 | slog (L_ERR, _("cannot create network interface '%s'."), conf.ifname); |
233 | exit (1); |
371 | return -1; |
234 | } |
372 | } |
235 | |
373 | |
236 | run_script (run_script_cb (this, &vpn::script_if_up), true); |
374 | fcntl (tap->fd, F_SETFD, FD_CLOEXEC); |
237 | |
375 | |
|
|
376 | run_script_cb cb; |
|
|
377 | cb.set<vpn, &vpn::script_if_init> (this); |
|
|
378 | |
|
|
379 | if (tap->if_up () && |
|
|
380 | !run_script (cb, true)) |
|
|
381 | { |
|
|
382 | slog (L_ERR, _("interface initialization command '%s' failed."), |
|
|
383 | tap->if_up ()); |
|
|
384 | return -1; |
|
|
385 | } |
|
|
386 | |
|
|
387 | cb.set<vpn, &vpn::script_if_up> (this); |
|
|
388 | if (!run_script (cb, true)) |
|
|
389 | { |
|
|
390 | slog (L_ERR, _("if-up command execution failed.")); |
|
|
391 | return -1; |
|
|
392 | } |
|
|
393 | |
238 | tap_ev_watcher.start (tap->fd, POLLIN); |
394 | tap_ev_watcher.start (tap->fd, EV_READ); |
239 | |
|
|
240 | reconnect_all (); |
|
|
241 | |
395 | |
242 | return 0; |
396 | return 0; |
243 | } |
397 | } |
244 | |
398 | |
245 | // send a vpn packet out to other hosts |
|
|
246 | bool |
399 | bool |
247 | vpn::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
400 | vpn::drop_privileges () |
248 | { |
401 | { |
249 | switch (si.prot) |
402 | if (::conf.change_root) |
|
|
403 | { |
|
|
404 | if (!strcmp (::conf.change_root, "/")) |
|
|
405 | { |
|
|
406 | char dir [L_tmpnam]; |
|
|
407 | if (!tmpnam (dir)) |
|
|
408 | { |
|
|
409 | slog (L_CRIT, _("unable to create anonymous root path.")); |
|
|
410 | return false; |
|
|
411 | } |
|
|
412 | |
|
|
413 | if (mkdir (dir, 0700)) |
|
|
414 | { |
|
|
415 | slog (L_CRIT, _("unable to crate anonymous root directory.")); |
|
|
416 | return false; |
|
|
417 | } |
|
|
418 | |
|
|
419 | if (chdir (dir)) |
|
|
420 | { |
|
|
421 | slog (L_CRIT, _("unable to change to anonymous root directory.")); |
|
|
422 | return false; |
|
|
423 | } |
|
|
424 | |
|
|
425 | if (rmdir (dir)) |
|
|
426 | slog (L_ERR, _("unable to remove anonymous root directory, continuing.")); |
|
|
427 | } |
|
|
428 | else |
|
|
429 | { |
|
|
430 | if (chdir (::conf.change_root)) |
|
|
431 | { |
|
|
432 | slog (L_CRIT, _("%s: unable to change to specified root directory."), ::conf.change_root); |
|
|
433 | return false; |
|
|
434 | } |
|
|
435 | } |
|
|
436 | |
|
|
437 | if (chroot (".")) |
|
|
438 | { |
|
|
439 | slog (L_CRIT, _("unable to set new root directory.")); |
|
|
440 | return false; |
|
|
441 | } |
|
|
442 | |
|
|
443 | if (chdir ("/")) |
|
|
444 | { |
|
|
445 | slog (L_CRIT, _("unable to set cwd to new root directory.")); |
|
|
446 | return false; |
|
|
447 | } |
|
|
448 | } |
|
|
449 | |
|
|
450 | if (::conf.change_gid) |
|
|
451 | if (setgid (::conf.change_gid)) |
250 | { |
452 | { |
251 | case PROT_IPv4: |
453 | slog (L_CRIT, _("unable to change group id to %d."), ::conf.change_gid); |
252 | return send_ipv4_packet (pkt, si, tos); |
|
|
253 | |
|
|
254 | case PROT_UDPv4: |
|
|
255 | return send_udpv4_packet (pkt, si, tos); |
|
|
256 | |
|
|
257 | #if ENABLE_TCP |
|
|
258 | case PROT_TCPv4: |
|
|
259 | return send_tcpv4_packet (pkt, si, tos); |
|
|
260 | #endif |
|
|
261 | |
|
|
262 | #if ENABLE_ICMP |
|
|
263 | case PROT_ICMPv4: |
|
|
264 | return send_icmpv4_packet (pkt, si, tos); |
|
|
265 | #endif |
|
|
266 | |
|
|
267 | default: |
|
|
268 | slog (L_CRIT, _("%s: FATAL: trying to send packet with unsupported protocol"), (const char *)si); |
|
|
269 | return false; |
454 | return false; |
270 | } |
455 | } |
|
|
456 | |
|
|
457 | if (::conf.change_uid) |
|
|
458 | if (setuid (::conf.change_uid)) |
|
|
459 | { |
|
|
460 | slog (L_CRIT, _("unable to change user id to %d."), ::conf.change_uid); |
|
|
461 | return false; |
|
|
462 | } |
|
|
463 | |
|
|
464 | return true; |
271 | } |
465 | } |
272 | |
466 | |
273 | bool |
467 | bool |
274 | vpn::send_ipv4_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
468 | vpn::send_ipv4_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
275 | { |
469 | { |
276 | setsockopt (ipv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos); |
470 | set_tos (ipv4_fd, ipv4_tos, tos); |
277 | sendto (ipv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ()); |
471 | sendto (ipv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ()); |
278 | |
472 | |
279 | return true; |
473 | return true; |
280 | } |
474 | } |
281 | |
475 | |
… | |
… | |
300 | sum += (sum >> 16); // carry |
494 | sum += (sum >> 16); // carry |
301 | |
495 | |
302 | return ~sum; |
496 | return ~sum; |
303 | } |
497 | } |
304 | |
498 | |
|
|
499 | #if ENABLE_ICMP |
305 | bool |
500 | bool |
306 | vpn::send_icmpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
501 | vpn::send_icmpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
307 | { |
502 | { |
308 | setsockopt (icmpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos); |
|
|
309 | |
|
|
310 | pkt->unshift_hdr (4); |
503 | pkt->unshift_hdr (4); |
311 | |
504 | |
312 | icmphdr *hdr = (icmphdr *)&((*pkt)[0]); |
505 | icmp_header *hdr = (icmp_header *)&((*pkt)[0]); |
313 | hdr->type = ::conf.icmp_type; |
506 | hdr->type = ::conf.icmp_type; |
314 | hdr->code = 255; |
507 | hdr->code = 255; |
315 | hdr->checksum = 0; |
508 | hdr->checksum = 0; |
316 | hdr->checksum = ipv4_checksum ((u16 *)hdr, pkt->len); |
509 | hdr->checksum = ipv4_checksum ((u16 *)hdr, pkt->len); |
317 | |
510 | |
|
|
511 | set_tos (icmpv4_fd, icmpv4_tos, tos); |
318 | sendto (icmpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ()); |
512 | sendto (icmpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ()); |
319 | |
513 | |
320 | return true; |
514 | return true; |
321 | } |
515 | } |
|
|
516 | #endif |
322 | |
517 | |
323 | bool |
518 | bool |
324 | vpn::send_udpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
519 | vpn::send_udpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
325 | { |
520 | { |
326 | setsockopt (udpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos); |
521 | set_tos (udpv4_fd, udpv4_tos, tos); |
327 | sendto (udpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ()); |
522 | sendto (udpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ()); |
328 | |
523 | |
329 | return true; |
524 | return true; |
|
|
525 | } |
|
|
526 | |
|
|
527 | void |
|
|
528 | vpn::inject_data_packet (tap_packet *pkt, int dst) |
|
|
529 | { |
|
|
530 | if (dst) |
|
|
531 | { |
|
|
532 | // unicast |
|
|
533 | if (dst != THISNODE->id) |
|
|
534 | conns[dst - 1]->inject_data_packet (pkt); |
|
|
535 | } |
|
|
536 | else |
|
|
537 | { |
|
|
538 | // broadcast, this is ugly, but due to the security policy |
|
|
539 | // we have to connect to all hosts... |
|
|
540 | for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c) |
|
|
541 | if ((*c)->conf != THISNODE) |
|
|
542 | (*c)->inject_data_packet (pkt); |
|
|
543 | } |
330 | } |
544 | } |
331 | |
545 | |
332 | void |
546 | void |
333 | vpn::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi) |
547 | vpn::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi) |
334 | { |
548 | { |
335 | unsigned int src = pkt->src (); |
549 | unsigned int src = pkt->src (); |
336 | unsigned int dst = pkt->dst (); |
550 | unsigned int dst = pkt->dst (); |
337 | |
551 | |
338 | slog (L_NOISE, _("<<?/%s received possible vpn packet type %d from %d to %d, length %d"), |
552 | slog (L_NOISE, _("<<?/%s received possible vpn packet type %d from %d to %d, length %d."), |
339 | (const char *)rsi, pkt->typ (), pkt->src (), pkt->dst (), pkt->len); |
553 | (const char *)rsi, pkt->typ (), pkt->src (), pkt->dst (), pkt->len); |
340 | |
554 | |
341 | if (src == 0 || src > conns.size () |
555 | if (src == 0 || src > conns.size () |
342 | || dst > conns.size () |
556 | || dst > conns.size () |
343 | || pkt->typ () >= vpn_packet::PT_MAX) |
557 | || pkt->typ () >= vpn_packet::PT_MAX) |
344 | slog (L_WARN, _("(%s): received corrupted packet type %d (src %d, dst %d)"), |
558 | slog (L_WARN, _("(%s): received corrupted packet type %d (src %d, dst %d)."), |
345 | (const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ()); |
|
|
346 | else if (dst > conns.size ()) |
|
|
347 | slog (L_WARN, _("(%s): received corrupted packet type %d (src %d, dst %d)"), |
|
|
348 | (const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ()); |
559 | (const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ()); |
349 | else |
560 | else |
350 | { |
561 | { |
351 | connection *c = conns[src - 1]; |
562 | connection *c = conns[src - 1]; |
352 | |
563 | |
353 | if (dst == 0 && !THISNODE->routerprio) |
564 | if (dst == 0) |
354 | slog (L_WARN, _("%s(%s): received broadcast, but we are no router"), |
565 | slog (L_WARN, _("%s(%s): received broadcast (protocol violation)."), |
355 | c->conf->nodename, (const char *)rsi); |
566 | c->conf->nodename, (const char *)rsi); |
356 | else if (dst != 0 && dst != THISNODE->id) |
567 | else if (dst != THISNODE->id) |
357 | { |
568 | { |
358 | if (THISNODE->routerprio) |
569 | if (THISNODE->routerprio) |
359 | // the tos setting gets lost here. who cares. |
570 | // the tos setting gets lost here. who cares. |
360 | conns[dst - 1]->inject_vpn_packet (pkt); |
571 | conns[dst - 1]->inject_vpn_packet (pkt); |
361 | else |
572 | else |
362 | slog (L_WARN, |
573 | slog (L_WARN, |
363 | _("%s(%s): forwarding request (=> %s), but we are no router"), |
574 | _("%s(%s): request to forward packet to %s, but we are no router (config mismatch?)."), |
364 | c->conf->nodename, (const char *)rsi, |
575 | c->conf->nodename, (const char *)rsi, |
365 | conns[dst - 1]->conf->nodename); |
576 | conns[dst - 1]->conf->nodename); |
366 | } |
577 | } |
367 | else |
578 | else |
368 | c->recv_vpn_packet (pkt, rsi); |
579 | c->recv_vpn_packet (pkt, rsi); |
369 | } |
580 | } |
370 | } |
581 | } |
371 | |
582 | |
372 | void |
583 | bool |
|
|
584 | vpn::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
|
|
585 | { |
|
|
586 | switch (si.prot) |
|
|
587 | { |
|
|
588 | case PROT_IPv4: |
|
|
589 | return send_ipv4_packet (pkt, si, tos); |
|
|
590 | |
|
|
591 | case PROT_UDPv4: |
|
|
592 | return send_udpv4_packet (pkt, si, tos); |
|
|
593 | |
|
|
594 | #if ENABLE_TCP |
|
|
595 | case PROT_TCPv4: |
|
|
596 | return send_tcpv4_packet (pkt, si, tos); |
|
|
597 | #endif |
|
|
598 | #if ENABLE_ICMP |
|
|
599 | case PROT_ICMPv4: |
|
|
600 | return send_icmpv4_packet (pkt, si, tos); |
|
|
601 | #endif |
|
|
602 | #if ENABLE_DNS |
|
|
603 | case PROT_DNSv4: |
|
|
604 | return send_dnsv4_packet (pkt, si, tos); |
|
|
605 | #endif |
|
|
606 | default: |
|
|
607 | slog (L_CRIT, _("%s: FATAL: trying to send packet with unsupported protocol."), (const char *)si); |
|
|
608 | } |
|
|
609 | |
|
|
610 | return false; |
|
|
611 | } |
|
|
612 | |
|
|
613 | inline void |
373 | vpn::ipv4_ev (io_watcher &w, short revents) |
614 | vpn::ipv4_ev (ev::io &w, int revents) |
374 | { |
615 | { |
375 | if (revents & (POLLIN | POLLERR)) |
616 | if (revents & EV_READ) |
376 | { |
617 | { |
377 | vpn_packet *pkt = new vpn_packet; |
618 | vpn_packet *pkt = new vpn_packet; |
378 | struct sockaddr_in sa; |
619 | struct sockaddr_in sa; |
379 | socklen_t sa_len = sizeof (sa); |
620 | socklen_t sa_len = sizeof (sa); |
380 | int len; |
621 | int len; |
… | |
… | |
385 | |
626 | |
386 | if (len > 0) |
627 | if (len > 0) |
387 | { |
628 | { |
388 | pkt->len = len; |
629 | pkt->len = len; |
389 | |
630 | |
390 | // raw sockets deliver the ipv4, but don't expect it on sends |
631 | // raw sockets deliver the ipv4 header, but don't expect it on sends |
391 | // this is slow, but... |
632 | pkt->skip_hdr (pkt->ipv4_hdr_len ()); |
392 | pkt->skip_hdr (IP_OVERHEAD); |
|
|
393 | |
633 | |
394 | recv_vpn_packet (pkt, si); |
634 | recv_vpn_packet (pkt, si); |
395 | } |
635 | } |
396 | else |
636 | else |
397 | { |
637 | { |
398 | // probably ECONNRESET or somesuch |
638 | // probably ECONNRESET or somesuch |
399 | slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno)); |
639 | slog (L_DEBUG, _("%s: %s."), (const char *)si, strerror (errno)); |
400 | } |
640 | } |
401 | |
641 | |
402 | delete pkt; |
642 | delete pkt; |
403 | } |
643 | } |
404 | else if (revents & POLLHUP) |
|
|
405 | { |
|
|
406 | // this cannot ;) happen on udp sockets |
|
|
407 | slog (L_ERR, _("FATAL: POLLHUP on ipv4 fd, terminating.")); |
|
|
408 | exit (1); |
|
|
409 | } |
|
|
410 | else |
644 | else |
411 | { |
645 | { |
412 | slog (L_ERR, |
646 | slog (L_ERR, |
413 | _("FATAL: unknown revents %08x in socket, terminating\n"), |
647 | _("FATAL: unknown revents %08x in socket, exiting.\n"), |
414 | revents); |
648 | revents); |
415 | exit (1); |
649 | exit (EXIT_FAILURE); |
416 | } |
650 | } |
417 | } |
651 | } |
418 | |
652 | |
419 | void |
653 | #if ENABLE_ICMP |
|
|
654 | inline void |
420 | vpn::icmpv4_ev (io_watcher &w, short revents) |
655 | vpn::icmpv4_ev (ev::io &w, int revents) |
421 | { |
656 | { |
422 | if (revents & (POLLIN | POLLERR)) |
657 | if (revents & EV_READ) |
423 | { |
658 | { |
424 | vpn_packet *pkt = new vpn_packet; |
659 | vpn_packet *pkt = new vpn_packet; |
425 | struct sockaddr_in sa; |
660 | struct sockaddr_in sa; |
426 | socklen_t sa_len = sizeof (sa); |
661 | socklen_t sa_len = sizeof (sa); |
427 | int len; |
662 | int len; |
… | |
… | |
432 | |
667 | |
433 | if (len > 0) |
668 | if (len > 0) |
434 | { |
669 | { |
435 | pkt->len = len; |
670 | pkt->len = len; |
436 | |
671 | |
437 | icmphdr *hdr = (icmphdr *)&((*pkt)[IP_OVERHEAD]); |
672 | icmp_header *hdr = (icmp_header *)&((*pkt)[IP_OVERHEAD]); |
438 | |
673 | |
439 | if (hdr->type == ::conf.icmp_type |
674 | if (hdr->type == ::conf.icmp_type |
440 | && hdr->code == 255) |
675 | && hdr->code == 255) |
441 | { |
676 | { |
442 | // raw sockets deliver the ipv4, but don't expect it on sends |
677 | // raw sockets deliver the ipv4, but don't expect it on sends |
443 | // this is slow, but... |
678 | // this is slow, but... |
444 | pkt->skip_hdr (ICMP_OVERHEAD); |
679 | pkt->skip_hdr (pkt->ipv4_hdr_len () + (ICMP_OVERHEAD - IP_OVERHEAD)); |
445 | |
680 | |
446 | recv_vpn_packet (pkt, si); |
681 | recv_vpn_packet (pkt, si); |
447 | } |
682 | } |
448 | } |
683 | } |
449 | else |
684 | else |
450 | { |
685 | { |
451 | // probably ECONNRESET or somesuch |
686 | // probably ECONNRESET or somesuch |
452 | slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno)); |
687 | slog (L_DEBUG, _("%s: %s."), (const char *)si, strerror (errno)); |
453 | } |
688 | } |
454 | |
689 | |
455 | delete pkt; |
690 | delete pkt; |
456 | } |
691 | } |
457 | else if (revents & POLLHUP) |
|
|
458 | { |
|
|
459 | // this cannot ;) happen on udp sockets |
|
|
460 | slog (L_ERR, _("FATAL: POLLHUP on icmpv4 fd, terminating.")); |
|
|
461 | exit (1); |
|
|
462 | } |
|
|
463 | else |
692 | else |
464 | { |
693 | { |
465 | slog (L_ERR, |
694 | slog (L_ERR, |
466 | _("FATAL: unknown revents %08x in socket, terminating\n"), |
695 | _("FATAL: unknown revents %08x in socket, exiting.\n"), |
467 | revents); |
696 | revents); |
468 | exit (1); |
697 | exit (EXIT_FAILURE); |
469 | } |
698 | } |
470 | } |
699 | } |
|
|
700 | #endif |
471 | |
701 | |
472 | void |
702 | inline void |
473 | vpn::udpv4_ev (io_watcher &w, short revents) |
703 | vpn::udpv4_ev (ev::io &w, int revents) |
474 | { |
704 | { |
475 | if (revents & (POLLIN | POLLERR)) |
705 | if (revents & EV_READ) |
476 | { |
706 | { |
477 | vpn_packet *pkt = new vpn_packet; |
707 | vpn_packet *pkt = new vpn_packet; |
478 | struct sockaddr_in sa; |
708 | struct sockaddr_in sa; |
479 | socklen_t sa_len = sizeof (sa); |
709 | socklen_t sa_len = sizeof (sa); |
480 | int len; |
710 | int len; |
… | |
… | |
490 | recv_vpn_packet (pkt, si); |
720 | recv_vpn_packet (pkt, si); |
491 | } |
721 | } |
492 | else |
722 | else |
493 | { |
723 | { |
494 | // probably ECONNRESET or somesuch |
724 | // probably ECONNRESET or somesuch |
495 | slog (L_DEBUG, _("%s: fd %d, %s"), (const char *)si, w.fd, strerror (errno)); |
725 | slog (L_DEBUG, _("%s: fd %d, %s."), (const char *)si, w.fd, strerror (errno)); |
496 | } |
726 | } |
497 | |
727 | |
498 | delete pkt; |
728 | delete pkt; |
499 | } |
729 | } |
500 | else if (revents & POLLHUP) |
|
|
501 | { |
|
|
502 | // this cannot ;) happen on udp sockets |
|
|
503 | slog (L_ERR, _("FATAL: POLLHUP on udp v4 fd, terminating.")); |
|
|
504 | exit (1); |
|
|
505 | } |
|
|
506 | else |
730 | else |
507 | { |
731 | { |
508 | slog (L_ERR, |
732 | slog (L_ERR, |
509 | _("FATAL: unknown revents %08x in socket, terminating\n"), |
733 | _("FATAL: unknown revents %08x in socket, exiting.\n"), |
510 | revents); |
734 | revents); |
511 | exit (1); |
735 | exit (EXIT_FAILURE); |
512 | } |
736 | } |
513 | } |
737 | } |
514 | |
738 | |
515 | void |
739 | inline void |
516 | vpn::tap_ev (io_watcher &w, short revents) |
740 | vpn::tap_ev (ev::io &w, int revents) |
517 | { |
741 | { |
518 | if (revents & POLLIN) |
742 | if (revents & EV_READ) |
519 | { |
743 | { |
520 | /* process data */ |
744 | /* process data */ |
521 | tap_packet *pkt; |
745 | tap_packet *pkt; |
522 | |
746 | |
523 | pkt = tap->recv (); |
747 | pkt = tap->recv (); |
524 | |
748 | |
|
|
749 | if (!pkt) |
|
|
750 | return; |
|
|
751 | |
|
|
752 | if (pkt->len > 14) |
|
|
753 | { |
525 | int dst = mac2id (pkt->dst); |
754 | int dst = mac2id (pkt->dst); |
526 | int src = mac2id (pkt->src); |
755 | int src = mac2id (pkt->src); |
527 | |
756 | |
528 | if (src != THISNODE->id) |
757 | if (src != THISNODE->id) |
529 | { |
|
|
530 | slog (L_ERR, _("FATAL: tap packet not originating on current node received, terminating.")); |
|
|
531 | exit (1); |
|
|
532 | } |
|
|
533 | |
|
|
534 | if (dst == THISNODE->id) |
|
|
535 | { |
|
|
536 | slog (L_ERR, _("FATAL: tap packet destined for current node received, terminating.")); |
|
|
537 | exit (1); |
|
|
538 | } |
|
|
539 | |
|
|
540 | if (dst > conns.size ()) |
|
|
541 | slog (L_ERR, _("tap packet for unknown node %d received, ignoring."), dst); |
|
|
542 | else |
|
|
543 | { |
|
|
544 | if (dst) |
|
|
545 | { |
758 | { |
546 | // unicast |
759 | slog (L_ERR, _("FATAL: tap packet not originating on current node received (if-up script not working properly?), exiting.")); |
547 | if (dst != THISNODE->id) |
760 | exit (EXIT_FAILURE); |
548 | conns[dst - 1]->inject_data_packet (pkt); |
|
|
549 | } |
761 | } |
|
|
762 | |
|
|
763 | if (dst == THISNODE->id) |
|
|
764 | { |
|
|
765 | slog (L_ERR, _("FATAL: tap packet destined for current node received, exiting.")); |
|
|
766 | exit (EXIT_FAILURE); |
|
|
767 | } |
|
|
768 | |
|
|
769 | if (dst > conns.size ()) |
|
|
770 | slog (L_ERR, _("tap packet for unknown node %d received, ignoring."), dst); |
550 | else |
771 | else |
551 | { |
|
|
552 | // broadcast, first check router, then self, then english |
|
|
553 | connection *router = find_router (); |
|
|
554 | |
|
|
555 | if (router) |
|
|
556 | router->inject_data_packet (pkt, true); |
772 | inject_data_packet (pkt, dst); |
557 | else |
|
|
558 | for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c) |
|
|
559 | if ((*c)->conf != THISNODE) |
|
|
560 | (*c)->inject_data_packet (pkt); |
|
|
561 | } |
|
|
562 | } |
773 | } |
563 | |
774 | |
564 | delete pkt; |
775 | delete pkt; |
565 | } |
|
|
566 | else if (revents & (POLLHUP | POLLERR)) |
|
|
567 | { |
|
|
568 | slog (L_ERR, _("FATAL: POLLHUP or POLLERR on network device fd, terminating.")); |
|
|
569 | exit (1); |
|
|
570 | } |
776 | } |
571 | else |
777 | else |
572 | abort (); |
778 | abort (); |
573 | } |
779 | } |
574 | |
780 | |
575 | void |
781 | inline void |
576 | vpn::event_cb (time_watcher &w) |
782 | vpn::event_cb (ev::timer &w, int) |
577 | { |
783 | { |
578 | if (events) |
784 | if (events) |
579 | { |
785 | { |
580 | if (events & EVENT_SHUTDOWN) |
786 | if (events & EVENT_SHUTDOWN) |
581 | { |
787 | { |
582 | slog (L_INFO, _("preparing shutdown...")); |
788 | slog (L_INFO, _("preparing shutdown...")); |
583 | |
789 | |
584 | shutdown_all (); |
790 | shutdown_all (); |
585 | |
|
|
586 | remove_pid (pidfilename); |
791 | remove_pid (conf.pidfilename); |
587 | |
|
|
588 | slog (L_INFO, _("terminating")); |
792 | slog (L_INFO, _("exiting.")); |
589 | |
793 | exit (EXIT_SUCCESS); |
590 | exit (0); |
|
|
591 | } |
794 | } |
592 | |
795 | |
593 | if (events & EVENT_RECONNECT) |
796 | if (events & EVENT_RECONNECT) |
594 | { |
797 | { |
595 | slog (L_INFO, _("forced reconnect")); |
798 | slog (L_INFO, _("forced reconnect.")); |
596 | |
799 | |
597 | reconnect_all (); |
800 | reconnect_all (); |
598 | } |
801 | } |
599 | |
802 | |
600 | events = 0; |
803 | events = 0; |
601 | } |
804 | } |
602 | |
|
|
603 | w.at = TSTAMP_CANCEL; |
|
|
604 | } |
805 | } |
605 | |
806 | |
606 | void |
807 | void |
607 | vpn::shutdown_all () |
808 | vpn::shutdown_all () |
608 | { |
809 | { |
… | |
… | |
618 | |
819 | |
619 | conns.clear (); |
820 | conns.clear (); |
620 | |
821 | |
621 | connection_init (); |
822 | connection_init (); |
622 | |
823 | |
623 | for (configuration::node_vector::iterator i = conf.nodes.begin (); |
824 | for (configuration::node_vector::iterator i = conf.nodes.begin (); i != conf.nodes.end (); ++i) |
624 | i != conf.nodes.end (); ++i) |
825 | conns.push_back (new connection (this, *i)); |
625 | { |
|
|
626 | connection *conn = new connection (this); |
|
|
627 | |
826 | |
628 | conn->conf = *i; |
827 | for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c) |
629 | conns.push_back (conn); |
|
|
630 | |
|
|
631 | conn->establish_connection (); |
828 | (*c)->establish_connection (); |
632 | } |
|
|
633 | } |
829 | } |
634 | |
830 | |
635 | connection *vpn::find_router () |
831 | bool |
|
|
832 | vpn::can_direct (conf_node *src, conf_node *dst) const |
636 | { |
833 | { |
637 | u32 prio = 0; |
834 | return src != dst |
|
|
835 | && src->may_direct (dst) |
|
|
836 | && dst->may_direct (src) |
|
|
837 | && (((src->protocols & dst->protocols) && src->connectmode == conf_node::C_ALWAYS) |
|
|
838 | || (src->protocols & dst->connectable_protocols ())); |
|
|
839 | } |
|
|
840 | |
|
|
841 | // only works for indirect and routed connections: find a router |
|
|
842 | // from THISNODE to dst |
|
|
843 | connection * |
|
|
844 | vpn::find_router_for (const connection *dst) |
|
|
845 | { |
638 | connection *router = 0; |
846 | connection *router = 0; |
639 | |
847 | |
|
|
848 | // first try to find a router with a direct connection, route there |
|
|
849 | // regardless of any other considerations. |
|
|
850 | { |
|
|
851 | u32 prio = 1; |
|
|
852 | |
|
|
853 | for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i) |
|
|
854 | { |
|
|
855 | connection *c = *i; |
|
|
856 | |
|
|
857 | if (c->conf->routerprio > prio |
|
|
858 | && c->conf != THISNODE |
|
|
859 | && can_direct (c->conf, dst->conf) |
|
|
860 | && c->ictx && c->octx) |
|
|
861 | { |
|
|
862 | prio = c->conf->routerprio; |
|
|
863 | router = c; |
|
|
864 | } |
|
|
865 | } |
|
|
866 | } |
|
|
867 | |
|
|
868 | if (router) |
|
|
869 | return router; |
|
|
870 | |
|
|
871 | // second try find the router with the highest priority, higher than ours |
|
|
872 | { |
|
|
873 | u32 prio = THISNODE->routerprio ? THISNODE->routerprio : 1; |
|
|
874 | |
|
|
875 | for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i) |
|
|
876 | { |
|
|
877 | connection *c = *i; |
|
|
878 | |
|
|
879 | if (c->conf->routerprio > prio |
|
|
880 | && c != dst |
|
|
881 | && c->conf != THISNODE |
|
|
882 | && c->ictx && c->octx) |
|
|
883 | { |
|
|
884 | prio = c->conf->routerprio; |
|
|
885 | router = c; |
|
|
886 | } |
|
|
887 | } |
|
|
888 | } |
|
|
889 | |
|
|
890 | return router; |
|
|
891 | } |
|
|
892 | |
|
|
893 | void |
|
|
894 | vpn::connection_established (connection *c) |
|
|
895 | { |
640 | for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i) |
896 | for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i) |
641 | { |
897 | { |
642 | connection *c = *i; |
898 | connection *o = *i; |
643 | |
899 | |
644 | if (c->conf->routerprio > prio |
900 | if (!o->is_direct |
645 | && c->connectmode == conf_node::C_ALWAYS // so we don't drop the connection if in use |
901 | && o->si.valid () |
646 | && c->ictx && c->octx |
902 | && c->si != o->si |
647 | && c->conf != THISNODE // redundant, since ictx==octx==0 always on thisnode |
903 | && c == find_router_for (o)) |
648 | && (!THISNODE->routerprio |
|
|
649 | || c->conf->routerprio <= THISNODE->routerprio)) |
|
|
650 | { |
|
|
651 | prio = c->conf->routerprio; |
|
|
652 | router = c; |
|
|
653 | } |
904 | { |
|
|
905 | slog (L_DEBUG, _("%s: can now route packets via %s, re-keying connection."), |
|
|
906 | o->conf->nodename, c->conf->nodename); |
|
|
907 | o->rekey (); |
|
|
908 | } |
654 | } |
909 | } |
655 | |
|
|
656 | return router; |
|
|
657 | } |
910 | } |
658 | |
911 | |
|
|
912 | void |
659 | void vpn::send_connect_request (int id) |
913 | vpn::send_connect_request (connection *c) |
660 | { |
914 | { |
661 | connection *c = find_router (); |
915 | connection *r = find_router_for (c); |
662 | |
916 | |
663 | if (c) |
917 | if (r) |
|
|
918 | { |
|
|
919 | slog (L_TRACE, _("%s: no address known, sending mediated connection request via %s."), |
|
|
920 | c->conf->nodename, r->conf->nodename); |
664 | c->send_connect_request (id); |
921 | r->send_connect_request (c->conf->id); |
|
|
922 | } |
665 | else |
923 | else |
666 | // no router found, aggressively connect to all routers |
924 | slog (L_DEBUG, _("%s: no way to connect and no router found: unable to connect at this time."), |
667 | for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i) |
925 | c->conf->nodename); |
668 | if ((*i)->conf->routerprio) |
|
|
669 | (*i)->establish_connection (); |
|
|
670 | } |
926 | } |
671 | |
927 | |
672 | void |
928 | void |
673 | connection::dump_status () |
929 | connection::dump_status () |
674 | { |
930 | { |
675 | slog (L_NOTICE, _("node %s (id %d)"), conf->nodename, conf->id); |
931 | slog (L_NOTICE, _("node %s (id %d)"), conf->nodename, conf->id); |
676 | slog (L_NOTICE, _(" connectmode %d (%d) / sockaddr %s / minor %d"), |
932 | slog (L_NOTICE, _(" connectmode %d (%d) / sockaddr %s / minor %d"), |
677 | connectmode, conf->connectmode, (const char *)si, (int)prot_minor); |
933 | connectmode, conf->connectmode, (const char *)si, (int)prot_minor); |
678 | slog (L_NOTICE, _(" ictx/octx %08lx/%08lx / oseqno %d / retry_cnt %d"), |
934 | slog (L_NOTICE, _(" ictx/octx %08lx/%08lx / oseqno %d / retry_cnt %d"), |
679 | (long)ictx, (long)octx, (int)oseqno, (int)retry_cnt); |
935 | (long)ictx, (long)octx, (int)oseqno, (int)retry_cnt); |
680 | slog (L_NOTICE, _(" establish_conn %ld / rekey %ld / keepalive %ld"), |
|
|
681 | (long)(establish_connection.at), (long)(rekey.at), (long)(keepalive.at)); |
|
|
682 | } |
936 | } |
683 | |
937 | |
684 | void |
938 | void |
685 | vpn::dump_status () |
939 | vpn::dump_status () |
686 | { |
940 | { |
687 | slog (L_NOTICE, _("BEGIN status dump (%ld)"), (long)NOW); |
941 | slog (L_NOTICE, _("BEGIN status dump (%ld)"), (long)ev_now ()); |
688 | |
942 | |
689 | for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c) |
943 | for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c) |
690 | (*c)->dump_status (); |
944 | (*c)->dump_status (); |
691 | |
945 | |
692 | slog (L_NOTICE, _("END status dump")); |
946 | slog (L_NOTICE, _("END status dump")); |
693 | } |
947 | } |
694 | |
948 | |
695 | vpn::vpn (void) |
949 | vpn::vpn (void) |
|
|
950 | { |
696 | : event (this, &vpn::event_cb) |
951 | event .set<vpn, &vpn::event_cb > (this); |
697 | , udpv4_ev_watcher (this, &vpn::udpv4_ev) |
952 | udpv4_ev_watcher .set<vpn, &vpn::udpv4_ev > (this); |
698 | , ipv4_ev_watcher (this, &vpn::ipv4_ev) |
953 | ipv4_ev_watcher .set<vpn, &vpn::ipv4_ev > (this); |
699 | #if ENABLE_TCP |
954 | #if ENABLE_TCP |
700 | , tcpv4_ev_watcher (this, &vpn::tcpv4_ev) |
955 | tcpv4_ev_watcher .set<vpn, &vpn::tcpv4_ev > (this); |
701 | #endif |
956 | #endif |
702 | #if ENABLE_ICMP |
957 | #if ENABLE_ICMP |
703 | , icmpv4_ev_watcher(this, &vpn::icmpv4_ev) |
958 | icmpv4_ev_watcher.set<vpn, &vpn::icmpv4_ev> (this); |
704 | #endif |
959 | #endif |
705 | , tap_ev_watcher (this, &vpn::tap_ev) |
960 | #if ENABLE_DNS |
706 | { |
961 | dnsv4_ev_watcher .set<vpn, &vpn::dnsv4_ev > (this); |
|
|
962 | #endif |
|
|
963 | tap_ev_watcher .set<vpn, &vpn::tap_ev > (this); |
707 | } |
964 | } |
708 | |
965 | |
709 | vpn::~vpn () |
966 | vpn::~vpn () |
710 | { |
967 | { |
711 | } |
968 | } |