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 <sys/socket.h> |
48 | #include <sys/socket.h> |
36 | #include <netinet/in.h> |
49 | |
37 | #include <arpa/inet.h> |
50 | #include "netcompat.h" |
38 | #include <net/if.h> |
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39 | #ifdef HAVE_NETINET_IN_SYSTM_H |
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40 | # include <netinet/in_systm.h> |
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41 | #endif |
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42 | #ifdef HAVE_NETINET_IP_H |
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43 | # include <netinet/ip.h> |
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44 | #endif |
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45 | #ifdef HAVE_NETINET_TCP_H |
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46 | # include <netinet/tcp.h> |
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47 | #endif |
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48 | #if ENABLE_ICMP |
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49 | # include <netinet/ip_icmp.h> |
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50 | #endif |
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51 | |
51 | |
52 | #include "pidfile.h" |
52 | #include "pidfile.h" |
53 | |
53 | |
54 | #include "connection.h" |
54 | #include "connection.h" |
55 | #include "util.h" |
55 | #include "util.h" |
56 | #include "vpn.h" |
56 | #include "vpn.h" |
57 | |
57 | |
58 | #if !defined(SOL_IP) && defined(IPPROTO_IP) |
58 | using namespace std; |
59 | # define SOL_IP IPPROTO_IP |
59 | |
60 | #endif |
60 | vpn network; // THE vpn (bad design...) |
61 | |
61 | |
62 | ///////////////////////////////////////////////////////////////////////////// |
62 | ///////////////////////////////////////////////////////////////////////////// |
63 | |
63 | |
64 | const char *vpn::script_if_up () |
64 | // hopefully temporary workaround for rare buffer full conditions |
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65 | // if it happens, usually instantly retrying or retrying ~5ms later |
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66 | // is good enough with current network technologies/kernels |
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67 | |
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68 | static ssize_t |
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69 | xsendto (int fd, const void *buf, size_t len, int flags, |
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70 | const struct sockaddr *sa, socklen_t salen) |
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71 | { |
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72 | ssize_t res; |
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73 | |
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74 | for (int retry = 0; retry <= 13; ++retry) // ~100ms |
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75 | { |
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76 | res = sendto (fd, buf, len, flags, sa, salen); |
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77 | |
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78 | if (res >= 0 || errno != ENOBUFS) |
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79 | break; |
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80 | |
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81 | struct timespec ts = { 0, 1000 * retry }; |
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82 | nanosleep (&ts, 0); |
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83 | } |
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84 | |
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85 | return res; |
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86 | } |
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87 | |
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88 | ///////////////////////////////////////////////////////////////////////////// |
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89 | |
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90 | static void inline |
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91 | set_tos (int fd, int &tos_prev, int tos) |
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92 | { |
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93 | #if defined(SOL_IP) && defined(IP_TOS) |
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94 | if (tos_prev == tos) |
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95 | return; |
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96 | |
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97 | tos_prev = tos; |
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98 | setsockopt (fd, SOL_IP, IP_TOS, &tos, sizeof tos); |
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99 | #endif |
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100 | } |
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101 | |
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102 | void |
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103 | vpn::script_init_env () |
65 | { |
104 | { |
66 | // the tunnel device mtu should be the physical mtu - overhead |
105 | // the tunnel device mtu should be the physical mtu - overhead |
67 | // the tricky part is rounding to the cipher key blocksize |
106 | // the tricky part is rounding to the cipher key blocksize |
68 | int mtu = conf.mtu - ETH_OVERHEAD - VPE_OVERHEAD - MAX_OVERHEAD; |
107 | int mtu = conf.mtu - ETH_OVERHEAD - VPE_OVERHEAD - MAX_OVERHEAD; |
69 | mtu += ETH_OVERHEAD - 6 - 6; // now we have the data portion |
108 | mtu += ETH_OVERHEAD - 6 - 6; // now we have the data portion |
70 | mtu -= mtu % EVP_CIPHER_block_size (CIPHER); // round |
109 | mtu -= mtu % BLOCK_SIZE (CIPHER); // round |
71 | mtu -= ETH_OVERHEAD - 6 - 6; // and get interface mtu again |
110 | mtu -= ETH_OVERHEAD - 6 - 6; // and get interface mtu again |
72 | |
111 | |
73 | char *env; |
112 | char *env; |
74 | asprintf (&env, "CONFBASE=%s", confbase); |
113 | asprintf (&env, "CONFBASE=%s", confbase); putenv (env); |
75 | putenv (env); |
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76 | asprintf (&env, "NODENAME=%s", THISNODE->nodename); |
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77 | putenv (env); |
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78 | asprintf (&env, "NODEID=%d", THISNODE->id); |
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79 | putenv (env); |
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80 | asprintf (&env, "IFNAME=%s", tap->interface ()); |
114 | asprintf (&env, "IFNAME=%s", tap->interface ()); putenv (env); |
81 | putenv (env); |
115 | asprintf (&env, "IFTYPE=%s", IFTYPE); putenv (env); |
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116 | asprintf (&env, "IFSUBTYPE=%s", IFSUBTYPE); putenv (env); |
82 | asprintf (&env, "MTU=%d", mtu); |
117 | asprintf (&env, "MTU=%d", mtu); putenv (env); |
83 | putenv (env); |
118 | asprintf (&env, "NODES=%d", conns.size ()); putenv (env); |
84 | asprintf (&env, "MAC=%02x:%02x:%02x:%02x:%02x:%02x", |
119 | asprintf (&env, "NODEID=%d", THISNODE->id); putenv (env); |
85 | 0xfe, 0xfd, 0x80, 0x00, THISNODE->id >> 8, |
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86 | THISNODE->id & 0xff); |
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87 | putenv (env); |
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88 | |
120 | |
89 | return ::conf.script_if_up ? ::conf.script_if_up : "if-up"; |
121 | conns [THISNODE->id - 1]->script_init_env (""); |
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122 | |
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123 | for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c) |
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124 | { |
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125 | char ext[16]; |
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126 | snprintf (ext, 16, "_%d", (*c)->conf->id); |
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127 | (*c)->script_init_env (ext); |
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128 | } |
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129 | } |
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130 | |
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131 | inline const char * |
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132 | vpn::script_if_init () |
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133 | { |
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134 | script_init_env (); |
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135 | |
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136 | return tap->if_up (); |
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137 | } |
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138 | |
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139 | inline const char * |
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140 | vpn::script_if_up () |
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141 | { |
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142 | script_init_env (); |
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143 | |
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144 | return conf.config_filename (::conf.script_if_up, "if-up"); |
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145 | } |
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146 | |
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147 | int |
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148 | vpn::setup_socket (u8 prot, int family, int type, int proto) |
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149 | { |
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150 | int fd = socket (family, type, proto); |
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151 | |
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152 | if (fd < 0) |
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153 | { |
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154 | slog (L_ERR, _("unable to create %s socket: %s."), strprotocol (prot), strerror (errno)); |
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155 | return fd; |
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156 | } |
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157 | |
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158 | fcntl (fd, F_SETFL, O_NONBLOCK); |
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159 | fcntl (fd, F_SETFD, FD_CLOEXEC); |
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160 | |
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161 | #ifdef SO_MARK |
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162 | if (::conf.nfmark) |
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163 | if (setsockopt (fd, SOL_SOCKET, SO_MARK, &::conf.nfmark, sizeof ::conf.nfmark)) |
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164 | slog (L_WARN, _("unable to set nfmark on %s socket: %s"), strprotocol (prot), strerror (errno)); |
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165 | #endif |
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166 | |
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167 | return fd; |
90 | } |
168 | } |
91 | |
169 | |
92 | int |
170 | int |
93 | vpn::setup () |
171 | vpn::setup () |
94 | { |
172 | { |
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173 | int success = 0; |
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174 | |
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175 | ipv4_tos = -1; |
95 | ipv4_fd = -1; |
176 | ipv4_fd = -1; |
96 | |
177 | |
97 | if (THISNODE->protocols & PROT_IPv4 && ::conf.ip_proto) |
178 | if (THISNODE->protocols & PROT_IPv4 && ::conf.ip_proto) |
98 | { |
179 | { |
99 | ipv4_fd = socket (PF_INET, SOCK_RAW, ::conf.ip_proto); |
180 | ipv4_fd = setup_socket (PROT_IPv4, PF_INET, SOCK_RAW, ::conf.ip_proto); |
100 | |
181 | |
101 | if (ipv4_fd < 0) |
182 | if (ipv4_fd < 0) |
102 | return -1; |
183 | return -1; |
103 | |
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104 | fcntl (ipv4_fd, F_SETFL, O_NONBLOCK); |
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105 | |
184 | |
106 | #if defined(SOL_IP) && defined(IP_MTU_DISCOVER) |
185 | #if defined(SOL_IP) && defined(IP_MTU_DISCOVER) |
107 | // this I really consider a linux bug. I am neither connected |
186 | // this I really consider a linux bug. I am neither connected |
108 | // nor do I fragment myself. Linux still sets DF and doesn't |
187 | // nor do I fragment myself. Linux still sets DF and doesn't |
109 | // fragment for me sometimes. |
188 | // fragment for me sometimes. |
… | |
… | |
115 | |
194 | |
116 | sockinfo si (THISNODE, PROT_IPv4); |
195 | sockinfo si (THISNODE, PROT_IPv4); |
117 | |
196 | |
118 | if (bind (ipv4_fd, si.sav4 (), si.salenv4 ())) |
197 | if (bind (ipv4_fd, si.sav4 (), si.salenv4 ())) |
119 | { |
198 | { |
120 | slog (L_ERR, _("can't bind ipv4 socket on %s: %s"), (const char *)si, strerror (errno)); |
199 | slog (L_ERR, _("can't bind ipv4 socket on %s: %s, exiting."), (const char *)si, strerror (errno)); |
121 | exit (1); |
200 | return -1; |
122 | } |
201 | } |
123 | |
202 | |
124 | ipv4_ev_watcher.start (ipv4_fd, POLLIN); |
203 | ipv4_ev_watcher.start (ipv4_fd, EV_READ); |
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204 | ++success; |
125 | } |
205 | } |
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206 | else |
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207 | THISNODE->protocols &= ~PROT_IPv4; |
126 | |
208 | |
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209 | udpv4_tos = -1; |
127 | udpv4_fd = -1; |
210 | udpv4_fd = -1; |
128 | |
211 | |
129 | if (THISNODE->protocols & PROT_UDPv4 && THISNODE->udp_port) |
212 | if (THISNODE->protocols & PROT_UDPv4 && THISNODE->udp_port) |
130 | { |
213 | { |
131 | udpv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP); |
214 | udpv4_fd = setup_socket (PROT_UDPv4, PF_INET, SOCK_DGRAM, IPPROTO_UDP); |
132 | |
215 | |
133 | if (udpv4_fd < 0) |
216 | if (udpv4_fd < 0) |
134 | return -1; |
217 | return -1; |
135 | |
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136 | fcntl (udpv4_fd, F_SETFL, O_NONBLOCK); |
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137 | |
218 | |
138 | // standard daemon practise... |
219 | // standard daemon practise... |
139 | { |
220 | { |
140 | int oval = 1; |
221 | int oval = 1; |
141 | setsockopt (udpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval); |
222 | setsockopt (udpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval); |
… | |
… | |
153 | |
234 | |
154 | sockinfo si (THISNODE, PROT_UDPv4); |
235 | sockinfo si (THISNODE, PROT_UDPv4); |
155 | |
236 | |
156 | if (bind (udpv4_fd, si.sav4 (), si.salenv4 ())) |
237 | if (bind (udpv4_fd, si.sav4 (), si.salenv4 ())) |
157 | { |
238 | { |
158 | slog (L_ERR, _("can't bind udpv4 on %s: %s"), (const char *)si, strerror (errno)); |
239 | slog (L_ERR, _("can't bind udpv4 on %s: %s, exiting."), (const char *)si, strerror (errno)); |
159 | exit (1); |
240 | return -1; |
160 | } |
241 | } |
161 | |
242 | |
162 | udpv4_ev_watcher.start (udpv4_fd, POLLIN); |
243 | udpv4_ev_watcher.start (udpv4_fd, EV_READ); |
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244 | ++success; |
163 | } |
245 | } |
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246 | else |
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247 | THISNODE->protocols &= ~PROT_UDPv4; |
164 | |
248 | |
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249 | icmpv4_tos = -1; |
165 | icmpv4_fd = -1; |
250 | icmpv4_fd = -1; |
166 | |
251 | |
167 | #if ENABLE_ICMP |
252 | #if ENABLE_ICMP |
168 | if (THISNODE->protocols & PROT_ICMPv4) |
253 | if (THISNODE->protocols & PROT_ICMPv4) |
169 | { |
254 | { |
170 | icmpv4_fd = socket (PF_INET, SOCK_RAW, IPPROTO_ICMP); |
255 | icmpv4_fd = setup_socket (PROT_ICMPv4, PF_INET, SOCK_RAW, IPPROTO_ICMP); |
171 | |
256 | |
172 | if (icmpv4_fd < 0) |
257 | if (icmpv4_fd < 0) |
173 | return -1; |
258 | return -1; |
174 | |
259 | |
175 | fcntl (icmpv4_fd, F_SETFL, O_NONBLOCK); |
260 | // no clue where trhis is actually defined |
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261 | #if !defined(ICMP_FILTER) && defined(__linux) |
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262 | #define ICMP_FILTER 1 |
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263 | #endif |
176 | |
264 | |
177 | #ifdef ICMP_FILTER |
265 | #ifdef ICMP_FILTER |
178 | { |
266 | { |
179 | icmp_filter oval; |
267 | uint32_t oval; |
180 | oval.data = 0xffffffff; |
268 | oval = 0; |
181 | if (::conf.icmp_type < 32) |
269 | if (::conf.icmp_type < 32) |
182 | oval.data &= ~(1 << ::conf.icmp_type); |
270 | oval |= 1 << ::conf.icmp_type; |
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271 | oval = ~oval; |
183 | |
272 | |
184 | setsockopt (icmpv4_fd, SOL_RAW, ICMP_FILTER, &oval, sizeof oval); |
273 | setsockopt (icmpv4_fd, SOL_RAW, ICMP_FILTER, &oval, sizeof oval); |
185 | } |
274 | } |
186 | #endif |
275 | #endif |
187 | |
276 | |
… | |
… | |
189 | // this I really consider a linux bug. I am neither connected |
278 | // this I really consider a linux bug. I am neither connected |
190 | // nor do I fragment myself. Linux still sets DF and doesn't |
279 | // nor do I fragment myself. Linux still sets DF and doesn't |
191 | // fragment for me sometimes. |
280 | // fragment for me sometimes. |
192 | { |
281 | { |
193 | int oval = IP_PMTUDISC_DONT; |
282 | int oval = IP_PMTUDISC_DONT; |
194 | setsockopt (udpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval); |
283 | setsockopt (icmpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval); |
195 | } |
284 | } |
196 | #endif |
285 | #endif |
197 | |
286 | |
198 | sockinfo si (THISNODE, PROT_ICMPv4); |
287 | sockinfo si (THISNODE, PROT_ICMPv4); |
199 | |
288 | |
200 | if (bind (icmpv4_fd, si.sav4 (), si.salenv4 ())) |
289 | if (bind (icmpv4_fd, si.sav4 (), si.salenv4 ())) |
201 | { |
290 | { |
202 | slog (L_ERR, _("can't bind icmpv4 on %s: %s"), (const char *)si, strerror (errno)); |
291 | slog (L_ERR, _("can't bind icmpv4 on %s: %s, exiting."), (const char *)si, strerror (errno)); |
203 | exit (1); |
292 | return -1; |
204 | } |
293 | } |
205 | |
294 | |
206 | icmpv4_ev_watcher.start (icmpv4_fd, POLLIN); |
295 | icmpv4_ev_watcher.start (icmpv4_fd, EV_READ); |
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296 | ++success; |
207 | } |
297 | } |
208 | #endif |
298 | #endif |
209 | |
299 | |
210 | tcpv4_fd = -1; |
300 | tcpv4_fd = -1; |
211 | |
301 | |
212 | #if ENABLE_TCP |
302 | #if ENABLE_TCP |
213 | if (THISNODE->protocols & PROT_TCPv4 && THISNODE->tcp_port) |
303 | if (THISNODE->protocols & PROT_TCPv4 && THISNODE->tcp_port) |
214 | { |
304 | { |
215 | tcpv4_fd = socket (PF_INET, SOCK_STREAM, IPPROTO_TCP); |
305 | tcpv4_fd = setup_socket (PROT_TCPv4, PF_INET, SOCK_STREAM, IPPROTO_TCP); |
216 | |
306 | |
217 | if (tcpv4_fd < 0) |
307 | if (tcpv4_fd < 0) |
218 | return -1; |
308 | return -1; |
219 | |
309 | |
220 | fcntl (tcpv4_fd, F_SETFL, O_NONBLOCK); |
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221 | |
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222 | // standard daemon practise... |
310 | // standard daemon practise... |
223 | { |
311 | { |
224 | int oval = 1; |
312 | int oval = 1; |
225 | setsockopt (tcpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval); |
313 | setsockopt (tcpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval); |
226 | } |
314 | } |
227 | |
315 | |
228 | sockinfo si (THISNODE, PROT_TCPv4); |
316 | sockinfo si (THISNODE, PROT_TCPv4); |
229 | |
317 | |
230 | if (bind (tcpv4_fd, si.sav4 (), si.salenv4 ())) |
318 | if (bind (tcpv4_fd, si.sav4 (), si.salenv4 ())) |
231 | { |
319 | { |
232 | slog (L_ERR, _("can't bind tcpv4 on %s: %s"), (const char *)si, strerror (errno)); |
320 | slog (L_ERR, _("can't bind tcpv4 on %s: %s, exiting."), (const char *)si, strerror (errno)); |
233 | exit (1); |
321 | return -1; |
234 | } |
322 | } |
235 | |
323 | |
236 | if (listen (tcpv4_fd, 5)) |
324 | if (listen (tcpv4_fd, 5)) |
237 | { |
325 | { |
238 | slog (L_ERR, _("can't listen tcpv4 on %s: %s"), (const char *)si, strerror (errno)); |
326 | slog (L_ERR, _("can't listen tcpv4 on %s: %s, exiting."), (const char *)si, strerror (errno)); |
239 | exit (1); |
327 | return -1; |
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328 | } |
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329 | |
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330 | tcpv4_ev_watcher.start (tcpv4_fd, EV_READ); |
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331 | ++success; |
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332 | } |
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333 | else |
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334 | THISNODE->protocols &= ~PROT_TCPv4; |
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335 | #endif |
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336 | |
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337 | dnsv4_tos = -1; |
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338 | dnsv4_fd = -1; |
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339 | |
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340 | #if ENABLE_DNS |
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341 | if (THISNODE->protocols & PROT_DNSv4) |
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342 | { |
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343 | dns_forwarder.set (::conf.dns_forw_host, ::conf.dns_forw_port, PROT_DNSv4); |
|
|
344 | |
|
|
345 | dnsv4_fd = setup_socket (PROT_DNSv4, PF_INET, SOCK_DGRAM, IPPROTO_UDP); |
|
|
346 | |
|
|
347 | if (dnsv4_fd < 0) |
|
|
348 | return -1; |
|
|
349 | |
|
|
350 | # if defined(SOL_IP) && defined(IP_MTU_DISCOVER) |
|
|
351 | // this I really consider a linux bug. I am neither connected |
|
|
352 | // nor do I fragment myself. Linux still sets DF and doesn't |
|
|
353 | // fragment for me sometimes. |
|
|
354 | { |
|
|
355 | int oval = IP_PMTUDISC_DONT; |
|
|
356 | setsockopt (dnsv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval); |
240 | } |
357 | } |
241 | |
|
|
242 | tcpv4_ev_watcher.start (tcpv4_fd, POLLIN); |
|
|
243 | } |
|
|
244 | #endif |
358 | # endif |
|
|
359 | |
|
|
360 | // standard daemon practise... |
|
|
361 | { |
|
|
362 | int oval = 1; |
|
|
363 | setsockopt (dnsv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval); |
|
|
364 | } |
|
|
365 | |
|
|
366 | sockinfo si (THISNODE->dns_hostname, |
|
|
367 | THISNODE->dns_hostname ? THISNODE->dns_port : 0, |
|
|
368 | PROT_DNSv4); |
|
|
369 | |
|
|
370 | if (bind (dnsv4_fd, si.sav4 (), si.salenv4 ())) |
|
|
371 | { |
|
|
372 | slog (L_ERR, _("can't bind dnsv4 on %s: %s, exiting."), (const char *)si, strerror (errno)); |
|
|
373 | return -1; |
|
|
374 | } |
|
|
375 | |
|
|
376 | dnsv4_ev_watcher.start (dnsv4_fd, EV_READ); |
|
|
377 | ++success; |
|
|
378 | } |
|
|
379 | #endif |
|
|
380 | |
|
|
381 | ///////////////////////////////////////////////////////////////////////////// |
|
|
382 | |
|
|
383 | if (!success) |
|
|
384 | { |
|
|
385 | slog (L_ERR, _("no protocols enabled.")); |
|
|
386 | return -1; |
|
|
387 | } |
|
|
388 | |
|
|
389 | reconnect_all (); |
|
|
390 | |
|
|
391 | ///////////////////////////////////////////////////////////////////////////// |
245 | |
392 | |
246 | tap = new tap_device (); |
393 | tap = new tap_device (); |
247 | if (!tap) //D this, of course, never catches |
394 | if (!tap) //D this, of course, never catches |
248 | { |
395 | { |
249 | slog (L_ERR, _("cannot create network interface '%s'"), conf.ifname); |
396 | slog (L_ERR, _("cannot create network interface '%s'."), conf.ifname); |
250 | exit (1); |
397 | return -1; |
251 | } |
398 | } |
252 | |
399 | |
253 | run_script (run_script_cb (this, &vpn::script_if_up), true); |
400 | fcntl (tap->fd, F_SETFD, FD_CLOEXEC); |
254 | |
401 | |
|
|
402 | run_script_cb cb; |
|
|
403 | cb.set<vpn, &vpn::script_if_init> (this); |
|
|
404 | |
|
|
405 | if (tap->if_up () && |
|
|
406 | !run_script (cb, true)) |
|
|
407 | { |
|
|
408 | slog (L_ERR, _("interface initialization command '%s' failed."), |
|
|
409 | tap->if_up ()); |
|
|
410 | return -1; |
|
|
411 | } |
|
|
412 | |
|
|
413 | cb.set<vpn, &vpn::script_if_up> (this); |
|
|
414 | if (!run_script (cb, true)) |
|
|
415 | { |
|
|
416 | slog (L_ERR, _("if-up command execution failed.")); |
|
|
417 | return -1; |
|
|
418 | } |
|
|
419 | |
255 | tap_ev_watcher.start (tap->fd, POLLIN); |
420 | tap_ev_watcher.start (tap->fd, EV_READ); |
256 | |
|
|
257 | reconnect_all (); |
|
|
258 | |
421 | |
259 | return 0; |
422 | return 0; |
260 | } |
423 | } |
261 | |
424 | |
262 | // send a vpn packet out to other hosts |
|
|
263 | bool |
425 | bool |
264 | vpn::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
426 | vpn::drop_privileges () |
265 | { |
427 | { |
266 | switch (si.prot) |
428 | if (::conf.change_root) |
|
|
429 | { |
|
|
430 | if (!strcmp (::conf.change_root, "/")) |
|
|
431 | { |
|
|
432 | char dir [L_tmpnam]; |
|
|
433 | if (!tmpnam (dir)) |
|
|
434 | { |
|
|
435 | slog (L_CRIT, _("unable to create anonymous root path.")); |
|
|
436 | return false; |
|
|
437 | } |
|
|
438 | |
|
|
439 | if (mkdir (dir, 0700)) |
|
|
440 | { |
|
|
441 | slog (L_CRIT, _("unable to create anonymous root directory.")); |
|
|
442 | return false; |
|
|
443 | } |
|
|
444 | |
|
|
445 | if (chdir (dir)) |
|
|
446 | { |
|
|
447 | slog (L_CRIT, _("unable to change to anonymous root directory.")); |
|
|
448 | return false; |
|
|
449 | } |
|
|
450 | |
|
|
451 | if (rmdir (dir)) |
|
|
452 | slog (L_ERR, _("unable to remove anonymous root directory, continuing.")); |
|
|
453 | } |
|
|
454 | else |
|
|
455 | { |
|
|
456 | if (chdir (::conf.change_root)) |
|
|
457 | { |
|
|
458 | slog (L_CRIT, _("%s: unable to change to specified root directory."), ::conf.change_root); |
|
|
459 | return false; |
|
|
460 | } |
|
|
461 | } |
|
|
462 | |
|
|
463 | if (chroot (".")) |
|
|
464 | { |
|
|
465 | slog (L_CRIT, _("unable to set new root directory.")); |
|
|
466 | return false; |
|
|
467 | } |
|
|
468 | |
|
|
469 | if (chdir ("/")) |
|
|
470 | { |
|
|
471 | slog (L_CRIT, _("unable to set cwd to new root directory.")); |
|
|
472 | return false; |
|
|
473 | } |
|
|
474 | } |
|
|
475 | |
|
|
476 | if (::conf.change_gid) |
|
|
477 | if (setgid (::conf.change_gid)) |
267 | { |
478 | { |
268 | case PROT_IPv4: |
479 | slog (L_CRIT, _("unable to change group id to %d."), ::conf.change_gid); |
269 | return send_ipv4_packet (pkt, si, tos); |
|
|
270 | |
|
|
271 | case PROT_UDPv4: |
|
|
272 | return send_udpv4_packet (pkt, si, tos); |
|
|
273 | |
|
|
274 | #if ENABLE_TCP |
|
|
275 | case PROT_TCPv4: |
|
|
276 | return send_tcpv4_packet (pkt, si, tos); |
|
|
277 | #endif |
|
|
278 | |
|
|
279 | #if ENABLE_ICMP |
|
|
280 | case PROT_ICMPv4: |
|
|
281 | return send_icmpv4_packet (pkt, si, tos); |
|
|
282 | #endif |
|
|
283 | |
|
|
284 | default: |
|
|
285 | slog (L_CRIT, _("%s: FATAL: trying to send packet with unsupported protocol"), (const char *)si); |
|
|
286 | return false; |
480 | return false; |
287 | } |
481 | } |
|
|
482 | |
|
|
483 | if (::conf.change_uid) |
|
|
484 | if (setuid (::conf.change_uid)) |
|
|
485 | { |
|
|
486 | slog (L_CRIT, _("unable to change user id to %d."), ::conf.change_uid); |
|
|
487 | return false; |
|
|
488 | } |
|
|
489 | |
|
|
490 | return true; |
288 | } |
491 | } |
289 | |
492 | |
290 | bool |
493 | bool |
291 | vpn::send_ipv4_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
494 | vpn::send_ipv4_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
292 | { |
495 | { |
293 | #if defined(SOL_IP) && defined(IP_TOS) |
496 | set_tos (ipv4_fd, ipv4_tos, tos); |
294 | setsockopt (ipv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos); |
|
|
295 | #endif |
|
|
296 | sendto (ipv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ()); |
497 | xsendto (ipv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ()); |
297 | |
498 | |
298 | return true; |
499 | return true; |
299 | } |
500 | } |
300 | |
501 | |
301 | static u16 |
502 | static u16 |
… | |
… | |
320 | |
521 | |
321 | return ~sum; |
522 | return ~sum; |
322 | } |
523 | } |
323 | |
524 | |
324 | #if ENABLE_ICMP |
525 | #if ENABLE_ICMP |
325 | struct icmp_header { |
|
|
326 | u8 type; |
|
|
327 | u8 code; |
|
|
328 | u16 checksum; |
|
|
329 | union { |
|
|
330 | struct { |
|
|
331 | u16 id; |
|
|
332 | u16 sequence; |
|
|
333 | } echo; |
|
|
334 | u32 gateway; |
|
|
335 | struct { |
|
|
336 | u16 unused; |
|
|
337 | u16 mtu; |
|
|
338 | } frag; |
|
|
339 | } un; |
|
|
340 | }; |
|
|
341 | |
|
|
342 | bool |
526 | bool |
343 | vpn::send_icmpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
527 | vpn::send_icmpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
344 | { |
528 | { |
345 | #if defined(SOL_IP) && defined(IP_TOS) |
|
|
346 | setsockopt (icmpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos); |
|
|
347 | #endif |
|
|
348 | |
|
|
349 | pkt->unshift_hdr (4); |
529 | pkt->unshift_hdr (4); |
350 | |
530 | |
351 | icmp_header *hdr = (icmp_header *)&((*pkt)[0]); |
531 | icmp_header *hdr = (icmp_header *)&((*pkt)[0]); |
352 | hdr->type = ::conf.icmp_type; |
532 | hdr->type = ::conf.icmp_type; |
353 | hdr->code = 255; |
533 | hdr->code = 255; |
354 | hdr->checksum = 0; |
534 | hdr->checksum = 0; |
355 | hdr->checksum = ipv4_checksum ((u16 *)hdr, pkt->len); |
535 | hdr->checksum = ipv4_checksum ((u16 *)hdr, pkt->len); |
356 | |
536 | |
|
|
537 | set_tos (icmpv4_fd, icmpv4_tos, tos); |
357 | sendto (icmpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ()); |
538 | xsendto (icmpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ()); |
358 | |
539 | |
359 | return true; |
540 | return true; |
360 | } |
541 | } |
361 | #endif |
542 | #endif |
362 | |
543 | |
363 | bool |
544 | bool |
364 | vpn::send_udpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
545 | vpn::send_udpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
365 | { |
546 | { |
366 | #if defined(SOL_IP) && defined(IP_TOS) |
547 | set_tos (udpv4_fd, udpv4_tos, tos); |
367 | setsockopt (udpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos); |
|
|
368 | #endif |
|
|
369 | sendto (udpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ()); |
548 | xsendto (udpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ()); |
370 | |
549 | |
371 | return true; |
550 | return true; |
|
|
551 | } |
|
|
552 | |
|
|
553 | void |
|
|
554 | vpn::inject_data_packet (tap_packet *pkt, int dst) |
|
|
555 | { |
|
|
556 | if (dst) |
|
|
557 | { |
|
|
558 | // unicast |
|
|
559 | if (dst != THISNODE->id) |
|
|
560 | conns[dst - 1]->inject_data_packet (pkt); |
|
|
561 | } |
|
|
562 | else |
|
|
563 | { |
|
|
564 | // broadcast, this is ugly, but due to the security policy |
|
|
565 | // we have to connect to all hosts... |
|
|
566 | for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c) |
|
|
567 | if ((*c)->conf != THISNODE) |
|
|
568 | (*c)->inject_data_packet (pkt); |
|
|
569 | } |
372 | } |
570 | } |
373 | |
571 | |
374 | void |
572 | void |
375 | vpn::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi) |
573 | vpn::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi) |
376 | { |
574 | { |
377 | unsigned int src = pkt->src (); |
575 | unsigned int src = pkt->src (); |
378 | unsigned int dst = pkt->dst (); |
576 | unsigned int dst = pkt->dst (); |
379 | |
577 | |
380 | slog (L_NOISE, _("<<?/%s received possible vpn packet type %d from %d to %d, length %d"), |
578 | slog (L_NOISE, _("<<?/%s received possible vpn packet type %d from %d to %d, length %d."), |
381 | (const char *)rsi, pkt->typ (), pkt->src (), pkt->dst (), pkt->len); |
579 | (const char *)rsi, pkt->typ (), pkt->src (), pkt->dst (), pkt->len); |
382 | |
580 | |
383 | if (src == 0 || src > conns.size () |
581 | if (src == 0 || src > conns.size () |
384 | || dst > conns.size () |
582 | || dst > conns.size () |
385 | || pkt->typ () >= vpn_packet::PT_MAX) |
583 | || pkt->typ () >= vpn_packet::PT_MAX) |
386 | slog (L_WARN, _("(%s): received corrupted packet type %d (src %d, dst %d)"), |
584 | slog (L_WARN, _("(%s): received corrupted packet type %d (src %d, dst %d)."), |
387 | (const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ()); |
|
|
388 | else if (dst > conns.size ()) |
|
|
389 | slog (L_WARN, _("(%s): received corrupted packet type %d (src %d, dst %d)"), |
|
|
390 | (const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ()); |
585 | (const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ()); |
391 | else |
586 | else |
392 | { |
587 | { |
393 | connection *c = conns[src - 1]; |
588 | connection *c = conns[src - 1]; |
394 | |
589 | |
395 | if (dst == 0) |
590 | if (dst == 0) |
396 | slog (L_WARN, _("%s(%s): received broadcast (protocol violation)"), |
591 | slog (L_WARN, _("%s(%s): received broadcast (protocol violation)."), |
397 | c->conf->nodename, (const char *)rsi); |
592 | c->conf->nodename, (const char *)rsi); |
398 | else if (dst != 0 && dst != THISNODE->id) |
593 | else if (dst != THISNODE->id) |
399 | { |
594 | { |
400 | if (THISNODE->routerprio) |
595 | if (THISNODE->routerprio) |
401 | // the tos setting gets lost here. who cares. |
596 | // the tos setting gets lost here. who cares. |
402 | conns[dst - 1]->inject_vpn_packet (pkt); |
597 | conns[dst - 1]->inject_vpn_packet (pkt); |
403 | else |
598 | else |
404 | slog (L_WARN, |
599 | slog (L_WARN, |
405 | _("%s(%s): forwarding request (=> %s), but we are no router"), |
600 | _("%s(%s): request to forward packet to %s, but we are no router (config mismatch?)."), |
406 | c->conf->nodename, (const char *)rsi, |
601 | c->conf->nodename, (const char *)rsi, |
407 | conns[dst - 1]->conf->nodename); |
602 | conns[dst - 1]->conf->nodename); |
408 | } |
603 | } |
409 | else |
604 | else |
410 | c->recv_vpn_packet (pkt, rsi); |
605 | c->recv_vpn_packet (pkt, rsi); |
411 | } |
606 | } |
412 | } |
607 | } |
413 | |
608 | |
414 | void |
609 | bool |
|
|
610 | vpn::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
|
|
611 | { |
|
|
612 | switch (si.prot) |
|
|
613 | { |
|
|
614 | case PROT_IPv4: |
|
|
615 | return send_ipv4_packet (pkt, si, tos); |
|
|
616 | |
|
|
617 | case PROT_UDPv4: |
|
|
618 | return send_udpv4_packet (pkt, si, tos); |
|
|
619 | |
|
|
620 | #if ENABLE_TCP |
|
|
621 | case PROT_TCPv4: |
|
|
622 | return send_tcpv4_packet (pkt, si, tos); |
|
|
623 | #endif |
|
|
624 | #if ENABLE_ICMP |
|
|
625 | case PROT_ICMPv4: |
|
|
626 | return send_icmpv4_packet (pkt, si, tos); |
|
|
627 | #endif |
|
|
628 | #if ENABLE_DNS |
|
|
629 | case PROT_DNSv4: |
|
|
630 | return send_dnsv4_packet (pkt, si, tos); |
|
|
631 | #endif |
|
|
632 | default: |
|
|
633 | slog (L_CRIT, _("%s: FATAL: trying to send packet with unsupported protocol."), (const char *)si); |
|
|
634 | } |
|
|
635 | |
|
|
636 | return false; |
|
|
637 | } |
|
|
638 | |
|
|
639 | inline void |
415 | vpn::ipv4_ev (io_watcher &w, short revents) |
640 | vpn::ipv4_ev (ev::io &w, int revents) |
416 | { |
641 | { |
417 | if (revents & (POLLIN | POLLERR)) |
642 | if (revents & EV_READ) |
418 | { |
643 | { |
419 | vpn_packet *pkt = new vpn_packet; |
644 | vpn_packet *pkt = new vpn_packet; |
420 | struct sockaddr_in sa; |
645 | struct sockaddr_in sa; |
421 | socklen_t sa_len = sizeof (sa); |
646 | socklen_t sa_len = sizeof (sa); |
422 | int len; |
647 | int len; |
… | |
… | |
427 | |
652 | |
428 | if (len > 0) |
653 | if (len > 0) |
429 | { |
654 | { |
430 | pkt->len = len; |
655 | pkt->len = len; |
431 | |
656 | |
432 | // raw sockets deliver the ipv4, but don't expect it on sends |
657 | // raw sockets deliver the ipv4 header, but don't expect it on sends |
433 | // this is slow, but... |
658 | pkt->skip_hdr (pkt->ipv4_hdr_len ()); |
434 | pkt->skip_hdr (IP_OVERHEAD); |
|
|
435 | |
659 | |
436 | recv_vpn_packet (pkt, si); |
660 | recv_vpn_packet (pkt, si); |
437 | } |
661 | } |
438 | else |
662 | else |
439 | { |
663 | { |
440 | // probably ECONNRESET or somesuch |
664 | // probably ECONNRESET or somesuch |
441 | slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno)); |
665 | slog (L_DEBUG, _("%s: %s."), (const char *)si, strerror (errno)); |
442 | } |
666 | } |
443 | |
667 | |
444 | delete pkt; |
668 | delete pkt; |
445 | } |
669 | } |
446 | else if (revents & POLLHUP) |
|
|
447 | { |
|
|
448 | // this cannot ;) happen on udp sockets |
|
|
449 | slog (L_ERR, _("FATAL: POLLHUP on ipv4 fd, terminating.")); |
|
|
450 | exit (1); |
|
|
451 | } |
|
|
452 | else |
670 | else |
453 | { |
671 | { |
454 | slog (L_ERR, |
672 | slog (L_ERR, |
455 | _("FATAL: unknown revents %08x in socket, terminating\n"), |
673 | _("FATAL: unknown revents %08x in socket, exiting.\n"), |
456 | revents); |
674 | revents); |
457 | exit (1); |
675 | exit (EXIT_FAILURE); |
458 | } |
676 | } |
459 | } |
677 | } |
460 | |
678 | |
461 | #if ENABLE_ICMP |
679 | #if ENABLE_ICMP |
462 | void |
680 | inline void |
463 | vpn::icmpv4_ev (io_watcher &w, short revents) |
681 | vpn::icmpv4_ev (ev::io &w, int revents) |
464 | { |
682 | { |
465 | if (revents & (POLLIN | POLLERR)) |
683 | if (revents & EV_READ) |
466 | { |
684 | { |
467 | vpn_packet *pkt = new vpn_packet; |
685 | vpn_packet *pkt = new vpn_packet; |
468 | struct sockaddr_in sa; |
686 | struct sockaddr_in sa; |
469 | socklen_t sa_len = sizeof (sa); |
687 | socklen_t sa_len = sizeof (sa); |
470 | int len; |
688 | int len; |
… | |
… | |
482 | if (hdr->type == ::conf.icmp_type |
700 | if (hdr->type == ::conf.icmp_type |
483 | && hdr->code == 255) |
701 | && hdr->code == 255) |
484 | { |
702 | { |
485 | // raw sockets deliver the ipv4, but don't expect it on sends |
703 | // raw sockets deliver the ipv4, but don't expect it on sends |
486 | // this is slow, but... |
704 | // this is slow, but... |
487 | pkt->skip_hdr (ICMP_OVERHEAD); |
705 | pkt->skip_hdr (pkt->ipv4_hdr_len () + (ICMP_OVERHEAD - IP_OVERHEAD)); |
488 | |
706 | |
489 | recv_vpn_packet (pkt, si); |
707 | recv_vpn_packet (pkt, si); |
490 | } |
708 | } |
491 | } |
709 | } |
492 | else |
710 | else |
493 | { |
711 | { |
494 | // probably ECONNRESET or somesuch |
712 | // probably ECONNRESET or somesuch |
495 | slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno)); |
713 | slog (L_DEBUG, _("%s: %s."), (const char *)si, strerror (errno)); |
496 | } |
714 | } |
497 | |
715 | |
498 | delete pkt; |
716 | delete pkt; |
499 | } |
717 | } |
500 | else if (revents & POLLHUP) |
|
|
501 | { |
|
|
502 | // this cannot ;) happen on udp sockets |
|
|
503 | slog (L_ERR, _("FATAL: POLLHUP on icmpv4 fd, terminating.")); |
|
|
504 | exit (1); |
|
|
505 | } |
|
|
506 | else |
718 | else |
507 | { |
719 | { |
508 | slog (L_ERR, |
720 | slog (L_ERR, |
509 | _("FATAL: unknown revents %08x in socket, terminating\n"), |
721 | _("FATAL: unknown revents %08x in socket, exiting.\n"), |
510 | revents); |
722 | revents); |
511 | exit (1); |
723 | exit (EXIT_FAILURE); |
512 | } |
724 | } |
513 | } |
725 | } |
514 | #endif |
726 | #endif |
515 | |
727 | |
516 | void |
728 | inline void |
517 | vpn::udpv4_ev (io_watcher &w, short revents) |
729 | vpn::udpv4_ev (ev::io &w, int revents) |
518 | { |
730 | { |
519 | if (revents & (POLLIN | POLLERR)) |
731 | if (revents & EV_READ) |
520 | { |
732 | { |
521 | vpn_packet *pkt = new vpn_packet; |
733 | vpn_packet *pkt = new vpn_packet; |
522 | struct sockaddr_in sa; |
734 | struct sockaddr_in sa; |
523 | socklen_t sa_len = sizeof (sa); |
735 | socklen_t sa_len = sizeof (sa); |
524 | int len; |
736 | int len; |
… | |
… | |
534 | recv_vpn_packet (pkt, si); |
746 | recv_vpn_packet (pkt, si); |
535 | } |
747 | } |
536 | else |
748 | else |
537 | { |
749 | { |
538 | // probably ECONNRESET or somesuch |
750 | // probably ECONNRESET or somesuch |
539 | slog (L_DEBUG, _("%s: fd %d, %s"), (const char *)si, w.fd, strerror (errno)); |
751 | slog (L_DEBUG, _("%s: fd %d, %s."), (const char *)si, w.fd, strerror (errno)); |
540 | } |
752 | } |
541 | |
753 | |
542 | delete pkt; |
754 | delete pkt; |
543 | } |
755 | } |
544 | else if (revents & POLLHUP) |
|
|
545 | { |
|
|
546 | // this cannot ;) happen on udp sockets |
|
|
547 | slog (L_ERR, _("FATAL: POLLHUP on udp v4 fd, terminating.")); |
|
|
548 | exit (1); |
|
|
549 | } |
|
|
550 | else |
756 | else |
551 | { |
757 | { |
552 | slog (L_ERR, |
758 | slog (L_ERR, |
553 | _("FATAL: unknown revents %08x in socket, terminating\n"), |
759 | _("FATAL: unknown revents %08x in socket, exiting.\n"), |
554 | revents); |
760 | revents); |
555 | exit (1); |
761 | exit (EXIT_FAILURE); |
556 | } |
762 | } |
557 | } |
763 | } |
558 | |
764 | |
559 | void |
765 | inline void |
560 | vpn::tap_ev (io_watcher &w, short revents) |
766 | vpn::tap_ev (ev::io &w, int revents) |
561 | { |
767 | { |
562 | if (revents & POLLIN) |
768 | if (revents & EV_READ) |
563 | { |
769 | { |
564 | /* process data */ |
770 | /* process data */ |
565 | tap_packet *pkt; |
771 | tap_packet *pkt; |
566 | |
772 | |
567 | pkt = tap->recv (); |
773 | pkt = tap->recv (); |
568 | |
774 | |
|
|
775 | if (!pkt) |
|
|
776 | return; |
|
|
777 | |
|
|
778 | if (pkt->len > 14) |
|
|
779 | { |
569 | int dst = mac2id (pkt->dst); |
780 | int dst = mac2id (pkt->dst); |
570 | int src = mac2id (pkt->src); |
781 | int src = mac2id (pkt->src); |
571 | |
782 | |
572 | if (src != THISNODE->id) |
783 | if (src != THISNODE->id) |
573 | { |
|
|
574 | slog (L_ERR, _("FATAL: tap packet not originating on current node received, exiting.")); |
|
|
575 | exit (1); |
|
|
576 | } |
|
|
577 | |
|
|
578 | if (dst == THISNODE->id) |
|
|
579 | { |
|
|
580 | slog (L_ERR, _("FATAL: tap packet destined for current node received, exiting.")); |
|
|
581 | exit (1); |
|
|
582 | } |
|
|
583 | |
|
|
584 | if (dst > conns.size ()) |
|
|
585 | slog (L_ERR, _("tap packet for unknown node %d received, ignoring."), dst); |
|
|
586 | else |
|
|
587 | { |
|
|
588 | if (dst) |
|
|
589 | { |
784 | { |
590 | // unicast |
785 | slog (L_ERR, _("FATAL: tap packet not originating on current node received (if-up script not working properly?), exiting.")); |
591 | if (dst != THISNODE->id) |
786 | exit (EXIT_FAILURE); |
592 | conns[dst - 1]->inject_data_packet (pkt); |
|
|
593 | } |
787 | } |
|
|
788 | |
|
|
789 | if (dst == THISNODE->id) |
|
|
790 | { |
|
|
791 | slog (L_ERR, _("FATAL: tap packet destined for current node received, exiting.")); |
|
|
792 | exit (EXIT_FAILURE); |
|
|
793 | } |
|
|
794 | |
|
|
795 | if (dst > conns.size ()) |
|
|
796 | slog (L_ERR, _("tap packet for unknown node %d received, ignoring."), dst); |
594 | else |
797 | else |
595 | { |
|
|
596 | // broadcast, this is ugly, but due to the security policy |
|
|
597 | // we have to connect to all hosts... |
|
|
598 | for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c) |
|
|
599 | if ((*c)->conf != THISNODE) |
|
|
600 | (*c)->inject_data_packet (pkt); |
798 | inject_data_packet (pkt, dst); |
601 | } |
|
|
602 | } |
799 | } |
603 | |
800 | |
604 | delete pkt; |
801 | delete pkt; |
605 | } |
|
|
606 | else if (revents & (POLLHUP | POLLERR)) |
|
|
607 | { |
|
|
608 | slog (L_ERR, _("FATAL: POLLHUP or POLLERR on network device fd, terminating.")); |
|
|
609 | exit (1); |
|
|
610 | } |
802 | } |
611 | else |
803 | else |
612 | abort (); |
804 | abort (); |
613 | } |
805 | } |
614 | |
806 | |
615 | void |
807 | inline void |
616 | vpn::event_cb (time_watcher &w) |
808 | vpn::event_cb (ev::timer &w, int) |
617 | { |
809 | { |
618 | if (events) |
810 | if (events) |
619 | { |
811 | { |
620 | if (events & EVENT_SHUTDOWN) |
812 | if (events & EVENT_SHUTDOWN) |
621 | { |
813 | { |
622 | slog (L_INFO, _("preparing shutdown...")); |
814 | slog (L_INFO, _("preparing shutdown...")); |
623 | |
815 | |
624 | shutdown_all (); |
816 | shutdown_all (); |
625 | |
|
|
626 | remove_pid (pidfilename); |
817 | remove_pid (conf.pidfilename); |
627 | |
|
|
628 | slog (L_INFO, _("terminating")); |
818 | slog (L_INFO, _("exiting.")); |
629 | |
819 | exit (EXIT_SUCCESS); |
630 | exit (0); |
|
|
631 | } |
820 | } |
632 | |
821 | |
633 | if (events & EVENT_RECONNECT) |
822 | if (events & EVENT_RECONNECT) |
634 | { |
823 | { |
635 | slog (L_INFO, _("forced reconnect")); |
824 | slog (L_INFO, _("forced reconnect.")); |
636 | |
825 | |
637 | reconnect_all (); |
826 | reconnect_all (); |
638 | } |
827 | } |
639 | |
828 | |
640 | events = 0; |
829 | events = 0; |
641 | } |
830 | } |
642 | |
|
|
643 | w.at = TSTAMP_CANCEL; |
|
|
644 | } |
831 | } |
645 | |
832 | |
646 | void |
833 | void |
647 | vpn::shutdown_all () |
834 | vpn::shutdown_all () |
648 | { |
835 | { |
… | |
… | |
658 | |
845 | |
659 | conns.clear (); |
846 | conns.clear (); |
660 | |
847 | |
661 | connection_init (); |
848 | connection_init (); |
662 | |
849 | |
663 | for (configuration::node_vector::iterator i = conf.nodes.begin (); |
850 | for (configuration::node_vector::iterator i = conf.nodes.begin (); i != conf.nodes.end (); ++i) |
664 | i != conf.nodes.end (); ++i) |
851 | conns.push_back (new connection (this, *i)); |
665 | { |
|
|
666 | connection *conn = new connection (this); |
|
|
667 | |
852 | |
668 | conn->conf = *i; |
853 | for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c) |
669 | conns.push_back (conn); |
|
|
670 | |
|
|
671 | conn->establish_connection (); |
854 | (*c)->establish_connection (); |
672 | } |
|
|
673 | } |
855 | } |
674 | |
856 | |
675 | connection *vpn::find_router () |
857 | bool |
|
|
858 | vpn::can_direct (conf_node *src, conf_node *dst) const |
676 | { |
859 | { |
677 | u32 prio = 1; |
860 | return src != dst |
|
|
861 | && src->may_direct (dst) |
|
|
862 | && dst->may_direct (src) |
|
|
863 | && (((src->protocols & dst->protocols) && src->connectmode == conf_node::C_ALWAYS) |
|
|
864 | || (src->protocols & dst->connectable_protocols ())); |
|
|
865 | } |
|
|
866 | |
|
|
867 | // only works for indirect and routed connections: find a router |
|
|
868 | // from THISNODE to dst |
|
|
869 | connection * |
|
|
870 | vpn::find_router_for (const connection *dst) |
|
|
871 | { |
678 | connection *router = 0; |
872 | connection *router = 0; |
679 | |
873 | |
|
|
874 | // first try to find a router with a direct connection, route there |
|
|
875 | // regardless of any other considerations. |
|
|
876 | { |
|
|
877 | u32 prio = 1; |
|
|
878 | |
|
|
879 | for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i) |
|
|
880 | { |
|
|
881 | connection *c = *i; |
|
|
882 | |
|
|
883 | if (c->conf->routerprio > prio |
|
|
884 | && c->conf != THISNODE |
|
|
885 | && can_direct (c->conf, dst->conf) |
|
|
886 | && c->ictx && c->octx) |
|
|
887 | { |
|
|
888 | prio = c->conf->routerprio; |
|
|
889 | router = c; |
|
|
890 | } |
|
|
891 | } |
|
|
892 | } |
|
|
893 | |
|
|
894 | if (router) |
|
|
895 | return router; |
|
|
896 | |
|
|
897 | // second try find the router with the highest priority, higher than ours |
|
|
898 | { |
|
|
899 | u32 prio = THISNODE->routerprio ? THISNODE->routerprio : 1; |
|
|
900 | |
|
|
901 | for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i) |
|
|
902 | { |
|
|
903 | connection *c = *i; |
|
|
904 | |
|
|
905 | if (c->conf->routerprio > prio |
|
|
906 | && c != dst |
|
|
907 | && c->conf != THISNODE |
|
|
908 | && c->ictx && c->octx) |
|
|
909 | { |
|
|
910 | prio = c->conf->routerprio; |
|
|
911 | router = c; |
|
|
912 | } |
|
|
913 | } |
|
|
914 | } |
|
|
915 | |
|
|
916 | return router; |
|
|
917 | } |
|
|
918 | |
|
|
919 | void |
|
|
920 | vpn::connection_established (connection *c) |
|
|
921 | { |
680 | for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i) |
922 | for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i) |
681 | { |
923 | { |
682 | connection *c = *i; |
924 | connection *o = *i; |
683 | |
925 | |
684 | if (c->conf->routerprio > prio |
926 | if (o->si.valid () |
685 | && c->connectmode == conf_node::C_ALWAYS // so we don't drop the connection if in use |
927 | && c->si != o->si |
686 | && c->ictx && c->octx |
928 | && c == find_router_for (o) |
687 | && c->conf != THISNODE) // redundant, since ictx==octx==0 always on thisnode |
929 | && !can_direct (THISNODE, o->conf)) |
688 | { |
|
|
689 | prio = c->conf->routerprio; |
|
|
690 | router = c; |
|
|
691 | } |
930 | { |
|
|
931 | slog (L_DEBUG, _("%s: can now route packets via %s, re-keying connection."), |
|
|
932 | o->conf->nodename, c->conf->nodename); |
|
|
933 | o->rekey (); |
|
|
934 | } |
692 | } |
935 | } |
693 | |
|
|
694 | return router; |
|
|
695 | } |
936 | } |
696 | |
937 | |
|
|
938 | void |
697 | void vpn::send_connect_request (int id) |
939 | vpn::send_connect_request (connection *c) |
698 | { |
940 | { |
699 | connection *c = find_router (); |
941 | connection *r = find_router_for (c); |
700 | |
942 | |
701 | if (c) |
943 | if (r) |
|
|
944 | { |
|
|
945 | slog (L_TRACE, _("%s: no address known, sending mediated connection request via %s."), |
|
|
946 | c->conf->nodename, r->conf->nodename); |
702 | c->send_connect_request (id); |
947 | r->send_connect_request (c->conf->id); |
|
|
948 | } |
703 | else |
949 | else |
704 | // no router found, aggressively connect to all routers |
950 | slog (L_DEBUG, _("%s: no way to connect and no router found: unable to connect at this time."), |
705 | for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i) |
951 | c->conf->nodename); |
706 | if ((*i)->conf->routerprio && (*i)->conf != THISNODE) |
|
|
707 | (*i)->establish_connection (); |
|
|
708 | } |
952 | } |
709 | |
953 | |
710 | void |
954 | void |
711 | connection::dump_status () |
955 | connection::dump_status () |
712 | { |
956 | { |
713 | slog (L_NOTICE, _("node %s (id %d)"), conf->nodename, conf->id); |
957 | slog (L_NOTICE, _("node %s (id %d)"), conf->nodename, conf->id); |
714 | slog (L_NOTICE, _(" connectmode %d (%d) / sockaddr %s / minor %d"), |
958 | slog (L_NOTICE, _(" connectmode %d (%d) / sockaddr %s / minor %d"), |
715 | connectmode, conf->connectmode, (const char *)si, (int)prot_minor); |
959 | connectmode, conf->connectmode, (const char *)si, (int)prot_minor); |
716 | slog (L_NOTICE, _(" ictx/octx %08lx/%08lx / oseqno %d / retry_cnt %d"), |
960 | slog (L_NOTICE, _(" ictx/octx %08lx/%08lx / oseqno %d / retry_cnt %d"), |
717 | (long)ictx, (long)octx, (int)oseqno, (int)retry_cnt); |
961 | (long)ictx, (long)octx, (int)oseqno, (int)retry_cnt); |
718 | slog (L_NOTICE, _(" establish_conn %ld / rekey %ld / keepalive %ld"), |
|
|
719 | (long)(establish_connection.at), (long)(rekey.at), (long)(keepalive.at)); |
|
|
720 | } |
962 | } |
721 | |
963 | |
722 | void |
964 | void |
723 | vpn::dump_status () |
965 | vpn::dump_status () |
724 | { |
966 | { |
725 | slog (L_NOTICE, _("BEGIN status dump (%ld)"), (long)NOW); |
967 | slog (L_NOTICE, _("BEGIN status dump (%ld)"), (long)ev_now ()); |
726 | |
968 | |
727 | for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c) |
969 | for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c) |
728 | (*c)->dump_status (); |
970 | (*c)->dump_status (); |
729 | |
971 | |
730 | slog (L_NOTICE, _("END status dump")); |
972 | slog (L_NOTICE, _("END status dump")); |
731 | } |
973 | } |
732 | |
974 | |
733 | vpn::vpn (void) |
975 | vpn::vpn (void) |
|
|
976 | { |
734 | : event (this, &vpn::event_cb) |
977 | event .set<vpn, &vpn::event_cb > (this); |
735 | , udpv4_ev_watcher (this, &vpn::udpv4_ev) |
978 | udpv4_ev_watcher .set<vpn, &vpn::udpv4_ev > (this); |
736 | , ipv4_ev_watcher (this, &vpn::ipv4_ev) |
979 | ipv4_ev_watcher .set<vpn, &vpn::ipv4_ev > (this); |
737 | #if ENABLE_TCP |
980 | #if ENABLE_TCP |
738 | , tcpv4_ev_watcher (this, &vpn::tcpv4_ev) |
981 | tcpv4_ev_watcher .set<vpn, &vpn::tcpv4_ev > (this); |
739 | #endif |
982 | #endif |
740 | #if ENABLE_ICMP |
983 | #if ENABLE_ICMP |
741 | , icmpv4_ev_watcher(this, &vpn::icmpv4_ev) |
984 | icmpv4_ev_watcher.set<vpn, &vpn::icmpv4_ev> (this); |
742 | #endif |
985 | #endif |
743 | , tap_ev_watcher (this, &vpn::tap_ev) |
986 | #if ENABLE_DNS |
744 | { |
987 | dnsv4_ev_watcher .set<vpn, &vpn::dnsv4_ev > (this); |
|
|
988 | #endif |
|
|
989 | tap_ev_watcher .set<vpn, &vpn::tap_ev > (this); |
745 | } |
990 | } |
746 | |
991 | |
747 | vpn::~vpn () |
992 | vpn::~vpn () |
748 | { |
993 | { |
749 | } |
994 | } |