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) 2003-2007 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 |
5 | it under the terms of the GNU General Public License as published by |
8 | it under the terms of the GNU General Public License as published by |
6 | the Free Software Foundation; either version 2 of the License, or |
9 | the Free Software Foundation; either version 2 of the License, or |
7 | (at your option) any later version. |
10 | (at your 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, |
10 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
13 | but 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 |
12 | GNU General Public License for more details. |
15 | GNU General 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 |
15 | along with this program; if not, write to the Free Software |
18 | along with gvpe; if not, write to the Free Software |
16 | Foundation, Inc. 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
19 | Foundation, Inc. 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
17 | */ |
20 | */ |
18 | |
21 | |
19 | #include "config.h" |
22 | #include "config.h" |
20 | |
23 | |
21 | #include <list> |
24 | #include <list> |
22 | |
25 | |
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26 | #include <cstdio> |
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27 | #include <cstring> |
23 | #include <cstdlib> |
28 | #include <cstdlib> |
24 | #include <cstring> |
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25 | #include <cstdio> |
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26 | |
29 | |
27 | #include <sys/types.h> |
30 | #include <sys/types.h> |
28 | #include <sys/socket.h> |
31 | #include <sys/socket.h> |
29 | #include <sys/poll.h> |
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30 | #include <sys/wait.h> |
32 | #include <sys/wait.h> |
31 | #include <errno.h> |
33 | #include <errno.h> |
32 | #include <time.h> |
34 | #include <time.h> |
33 | #include <unistd.h> |
35 | #include <unistd.h> |
34 | #include <fcntl.h> |
36 | #include <fcntl.h> |
… | |
… | |
40 | |
42 | |
41 | #include "connection.h" |
43 | #include "connection.h" |
42 | #include "util.h" |
44 | #include "util.h" |
43 | #include "vpn.h" |
45 | #include "vpn.h" |
44 | |
46 | |
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47 | vpn network; // THE vpn (bad design...) |
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48 | |
45 | ///////////////////////////////////////////////////////////////////////////// |
49 | ///////////////////////////////////////////////////////////////////////////// |
46 | |
50 | |
47 | const char *vpn::script_if_up () |
51 | static void inline |
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52 | set_tos (int fd, int &tos_prev, int tos) |
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53 | { |
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54 | #if defined(SOL_IP) && defined(IP_TOS) |
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55 | if (tos_prev == tos) |
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56 | return; |
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57 | |
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58 | tos_prev = tos; |
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59 | setsockopt (fd, SOL_IP, IP_TOS, &tos, sizeof tos); |
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60 | #endif |
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61 | } |
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62 | |
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63 | void |
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64 | vpn::script_init_env () |
48 | { |
65 | { |
49 | // the tunnel device mtu should be the physical mtu - overhead |
66 | // the tunnel device mtu should be the physical mtu - overhead |
50 | // the tricky part is rounding to the cipher key blocksize |
67 | // the tricky part is rounding to the cipher key blocksize |
51 | int mtu = conf.mtu - ETH_OVERHEAD - VPE_OVERHEAD - MAX_OVERHEAD; |
68 | int mtu = conf.mtu - ETH_OVERHEAD - VPE_OVERHEAD - MAX_OVERHEAD; |
52 | mtu += ETH_OVERHEAD - 6 - 6; // now we have the data portion |
69 | mtu += ETH_OVERHEAD - 6 - 6; // now we have the data portion |
53 | mtu -= mtu % EVP_CIPHER_block_size (CIPHER); // round |
70 | mtu -= mtu % EVP_CIPHER_block_size (CIPHER); // round |
54 | mtu -= ETH_OVERHEAD - 6 - 6; // and get interface mtu again |
71 | mtu -= ETH_OVERHEAD - 6 - 6; // and get interface mtu again |
55 | |
72 | |
56 | char *env; |
73 | char *env; |
57 | asprintf (&env, "CONFBASE=%s", confbase); |
74 | 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 ()); |
75 | asprintf (&env, "IFNAME=%s", tap->interface ()); putenv (env); |
64 | putenv (env); |
76 | asprintf (&env, "IFTYPE=%s", IFTYPE); putenv (env); |
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77 | asprintf (&env, "IFSUBTYPE=%s", IFSUBTYPE); putenv (env); |
65 | asprintf (&env, "MTU=%d", mtu); |
78 | asprintf (&env, "MTU=%d", mtu); putenv (env); |
66 | putenv (env); |
79 | asprintf (&env, "NODES=%d", conns.size ()); putenv (env); |
67 | asprintf (&env, "MAC=%02x:%02x:%02x:%02x:%02x:%02x", |
80 | 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 | |
81 | |
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82 | conns [THISNODE->id - 1]->script_init_env (""); |
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83 | |
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84 | for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c) |
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85 | { |
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86 | char ext[16]; |
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87 | snprintf (ext, 16, "_%d", (*c)->conf->id); |
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88 | (*c)->script_init_env (ext); |
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89 | } |
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90 | } |
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91 | |
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92 | inline const char * |
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93 | vpn::script_if_init () |
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94 | { |
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95 | script_init_env (); |
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96 | |
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97 | return tap->if_up (); |
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98 | } |
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99 | |
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100 | inline const char * |
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101 | vpn::script_if_up () |
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102 | { |
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103 | script_init_env (); |
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104 | |
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105 | char *filename; |
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106 | asprintf (&filename, |
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107 | "%s/%s", |
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108 | confbase, |
72 | return ::conf.script_if_up ? ::conf.script_if_up : "if-up"; |
109 | ::conf.script_if_up ? ::conf.script_if_up : "if-up"); |
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110 | |
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111 | return filename; |
73 | } |
112 | } |
74 | |
113 | |
75 | int |
114 | int |
76 | vpn::setup () |
115 | vpn::setup () |
77 | { |
116 | { |
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117 | ipv4_tos = -1; |
78 | ipv4_fd = -1; |
118 | ipv4_fd = -1; |
79 | |
119 | |
80 | if (THISNODE->protocols & PROT_IPv4 && ::conf.ip_proto) |
120 | if (THISNODE->protocols & PROT_IPv4 && ::conf.ip_proto) |
81 | { |
121 | { |
82 | ipv4_fd = socket (PF_INET, SOCK_RAW, ::conf.ip_proto); |
122 | ipv4_fd = socket (PF_INET, SOCK_RAW, ::conf.ip_proto); |
83 | |
123 | |
84 | if (ipv4_fd < 0) |
124 | if (ipv4_fd < 0) |
85 | return -1; |
125 | return -1; |
86 | |
126 | |
87 | fcntl (ipv4_fd, F_SETFL, O_NONBLOCK); |
127 | fcntl (ipv4_fd, F_SETFL, O_NONBLOCK); |
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128 | fcntl (ipv4_fd, F_SETFD, FD_CLOEXEC); |
88 | |
129 | |
89 | #if defined(SOL_IP) && defined(IP_MTU_DISCOVER) |
130 | #if defined(SOL_IP) && defined(IP_MTU_DISCOVER) |
90 | // this I really consider a linux bug. I am neither connected |
131 | // this I really consider a linux bug. I am neither connected |
91 | // nor do I fragment myself. Linux still sets DF and doesn't |
132 | // nor do I fragment myself. Linux still sets DF and doesn't |
92 | // fragment for me sometimes. |
133 | // fragment for me sometimes. |
… | |
… | |
99 | sockinfo si (THISNODE, PROT_IPv4); |
140 | sockinfo si (THISNODE, PROT_IPv4); |
100 | |
141 | |
101 | if (bind (ipv4_fd, si.sav4 (), si.salenv4 ())) |
142 | if (bind (ipv4_fd, si.sav4 (), si.salenv4 ())) |
102 | { |
143 | { |
103 | slog (L_ERR, _("can't bind ipv4 socket on %s: %s"), (const char *)si, strerror (errno)); |
144 | slog (L_ERR, _("can't bind ipv4 socket on %s: %s"), (const char *)si, strerror (errno)); |
104 | exit (1); |
145 | exit (EXIT_FAILURE); |
105 | } |
146 | } |
106 | |
147 | |
107 | ipv4_ev_watcher.start (ipv4_fd, POLLIN); |
148 | ipv4_ev_watcher.start (ipv4_fd, EV_READ); |
108 | } |
149 | } |
109 | |
150 | |
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151 | udpv4_tos = -1; |
110 | udpv4_fd = -1; |
152 | udpv4_fd = -1; |
111 | |
153 | |
112 | if (THISNODE->protocols & PROT_UDPv4 && THISNODE->udp_port) |
154 | if (THISNODE->protocols & PROT_UDPv4 && THISNODE->udp_port) |
113 | { |
155 | { |
114 | udpv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP); |
156 | udpv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP); |
115 | |
157 | |
116 | if (udpv4_fd < 0) |
158 | if (udpv4_fd < 0) |
117 | return -1; |
159 | return -1; |
118 | |
160 | |
119 | fcntl (udpv4_fd, F_SETFL, O_NONBLOCK); |
161 | fcntl (udpv4_fd, F_SETFL, O_NONBLOCK); |
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162 | fcntl (udpv4_fd, F_SETFD, FD_CLOEXEC); |
120 | |
163 | |
121 | // standard daemon practise... |
164 | // standard daemon practise... |
122 | { |
165 | { |
123 | int oval = 1; |
166 | int oval = 1; |
124 | setsockopt (udpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval); |
167 | setsockopt (udpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval); |
… | |
… | |
137 | sockinfo si (THISNODE, PROT_UDPv4); |
180 | sockinfo si (THISNODE, PROT_UDPv4); |
138 | |
181 | |
139 | if (bind (udpv4_fd, si.sav4 (), si.salenv4 ())) |
182 | if (bind (udpv4_fd, si.sav4 (), si.salenv4 ())) |
140 | { |
183 | { |
141 | slog (L_ERR, _("can't bind udpv4 on %s: %s"), (const char *)si, strerror (errno)); |
184 | slog (L_ERR, _("can't bind udpv4 on %s: %s"), (const char *)si, strerror (errno)); |
142 | exit (1); |
185 | exit (EXIT_FAILURE); |
143 | } |
186 | } |
144 | |
187 | |
145 | udpv4_ev_watcher.start (udpv4_fd, POLLIN); |
188 | udpv4_ev_watcher.start (udpv4_fd, EV_READ); |
146 | } |
189 | } |
147 | |
190 | |
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191 | icmpv4_tos = -1; |
148 | icmpv4_fd = -1; |
192 | icmpv4_fd = -1; |
149 | |
193 | |
150 | #if ENABLE_ICMP |
194 | #if ENABLE_ICMP |
151 | if (THISNODE->protocols & PROT_ICMPv4) |
195 | if (THISNODE->protocols & PROT_ICMPv4) |
152 | { |
196 | { |
153 | icmpv4_fd = socket (PF_INET, SOCK_RAW, IPPROTO_ICMP); |
197 | icmpv4_fd = socket (PF_INET, SOCK_RAW, IPPROTO_ICMP); |
154 | |
198 | |
155 | if (icmpv4_fd < 0) |
199 | if (icmpv4_fd < 0) |
156 | return -1; |
200 | return -1; |
157 | |
201 | |
158 | fcntl (icmpv4_fd, F_SETFL, O_NONBLOCK); |
202 | fcntl (icmpv4_fd, F_SETFL, O_NONBLOCK); |
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203 | fcntl (icmpv4_fd, F_SETFD, FD_CLOEXEC); |
159 | |
204 | |
160 | #ifdef ICMP_FILTER |
205 | #ifdef ICMP_FILTER |
161 | { |
206 | { |
162 | icmp_filter oval; |
207 | icmp_filter oval; |
163 | oval.data = 0xffffffff; |
208 | oval.data = 0xffffffff; |
… | |
… | |
172 | // this I really consider a linux bug. I am neither connected |
217 | // this I really consider a linux bug. I am neither connected |
173 | // nor do I fragment myself. Linux still sets DF and doesn't |
218 | // nor do I fragment myself. Linux still sets DF and doesn't |
174 | // fragment for me sometimes. |
219 | // fragment for me sometimes. |
175 | { |
220 | { |
176 | int oval = IP_PMTUDISC_DONT; |
221 | int oval = IP_PMTUDISC_DONT; |
177 | setsockopt (udpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval); |
222 | setsockopt (icmpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval); |
178 | } |
223 | } |
179 | #endif |
224 | #endif |
180 | |
225 | |
181 | sockinfo si (THISNODE, PROT_ICMPv4); |
226 | sockinfo si (THISNODE, PROT_ICMPv4); |
182 | |
227 | |
183 | if (bind (icmpv4_fd, si.sav4 (), si.salenv4 ())) |
228 | if (bind (icmpv4_fd, si.sav4 (), si.salenv4 ())) |
184 | { |
229 | { |
185 | slog (L_ERR, _("can't bind icmpv4 on %s: %s"), (const char *)si, strerror (errno)); |
230 | slog (L_ERR, _("can't bind icmpv4 on %s: %s"), (const char *)si, strerror (errno)); |
186 | exit (1); |
231 | exit (EXIT_FAILURE); |
187 | } |
232 | } |
188 | |
233 | |
189 | icmpv4_ev_watcher.start (icmpv4_fd, POLLIN); |
234 | icmpv4_ev_watcher.start (icmpv4_fd, EV_READ); |
190 | } |
235 | } |
191 | #endif |
236 | #endif |
192 | |
237 | |
193 | tcpv4_fd = -1; |
238 | tcpv4_fd = -1; |
194 | |
239 | |
… | |
… | |
199 | |
244 | |
200 | if (tcpv4_fd < 0) |
245 | if (tcpv4_fd < 0) |
201 | return -1; |
246 | return -1; |
202 | |
247 | |
203 | fcntl (tcpv4_fd, F_SETFL, O_NONBLOCK); |
248 | fcntl (tcpv4_fd, F_SETFL, O_NONBLOCK); |
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249 | fcntl (tcpv4_fd, F_SETFD, FD_CLOEXEC); |
204 | |
250 | |
205 | // standard daemon practise... |
251 | // standard daemon practise... |
206 | { |
252 | { |
207 | int oval = 1; |
253 | int oval = 1; |
208 | setsockopt (tcpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval); |
254 | setsockopt (tcpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval); |
… | |
… | |
211 | sockinfo si (THISNODE, PROT_TCPv4); |
257 | sockinfo si (THISNODE, PROT_TCPv4); |
212 | |
258 | |
213 | if (bind (tcpv4_fd, si.sav4 (), si.salenv4 ())) |
259 | if (bind (tcpv4_fd, si.sav4 (), si.salenv4 ())) |
214 | { |
260 | { |
215 | slog (L_ERR, _("can't bind tcpv4 on %s: %s"), (const char *)si, strerror (errno)); |
261 | slog (L_ERR, _("can't bind tcpv4 on %s: %s"), (const char *)si, strerror (errno)); |
216 | exit (1); |
262 | exit (EXIT_FAILURE); |
217 | } |
263 | } |
218 | |
264 | |
219 | if (listen (tcpv4_fd, 5)) |
265 | if (listen (tcpv4_fd, 5)) |
220 | { |
266 | { |
221 | slog (L_ERR, _("can't listen tcpv4 on %s: %s"), (const char *)si, strerror (errno)); |
267 | slog (L_ERR, _("can't listen tcpv4 on %s: %s"), (const char *)si, strerror (errno)); |
222 | exit (1); |
268 | exit (EXIT_FAILURE); |
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269 | } |
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270 | |
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271 | tcpv4_ev_watcher.start (tcpv4_fd, EV_READ); |
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272 | } |
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273 | #endif |
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274 | |
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275 | dnsv4_tos = -1; |
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276 | dnsv4_fd = -1; |
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277 | |
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278 | #if ENABLE_DNS |
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279 | if (THISNODE->protocols & PROT_DNSv4) |
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280 | { |
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281 | dns_forwarder.set (::conf.dns_forw_host, ::conf.dns_forw_port, PROT_DNSv4); |
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282 | |
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283 | dnsv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP); |
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284 | |
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285 | if (dnsv4_fd < 0) |
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286 | return -1; |
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287 | |
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288 | fcntl (dnsv4_fd, F_SETFL, O_NONBLOCK); |
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289 | fcntl (dnsv4_fd, F_SETFD, FD_CLOEXEC); |
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290 | |
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291 | # if defined(SOL_IP) && defined(IP_MTU_DISCOVER) |
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292 | // this I really consider a linux bug. I am neither connected |
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293 | // nor do I fragment myself. Linux still sets DF and doesn't |
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294 | // fragment for me sometimes. |
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295 | { |
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296 | int oval = IP_PMTUDISC_DONT; |
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297 | setsockopt (dnsv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval); |
223 | } |
298 | } |
224 | |
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225 | tcpv4_ev_watcher.start (tcpv4_fd, POLLIN); |
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226 | } |
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227 | #endif |
299 | # endif |
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300 | |
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301 | // standard daemon practise... |
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302 | { |
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303 | int oval = 1; |
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304 | setsockopt (dnsv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval); |
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305 | } |
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306 | |
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307 | sockinfo si (THISNODE->dns_hostname, |
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308 | THISNODE->dns_hostname ? THISNODE->dns_port : 0, |
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309 | PROT_DNSv4); |
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310 | |
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311 | if (bind (dnsv4_fd, si.sav4 (), si.salenv4 ())) |
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312 | { |
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313 | slog (L_ERR, _("can't bind dnsv4 on %s: %s"), (const char *)si, strerror (errno)); |
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314 | exit (EXIT_FAILURE); |
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315 | } |
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316 | |
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317 | dnsv4_ev_watcher.start (dnsv4_fd, EV_READ); |
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318 | } |
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319 | #endif |
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320 | |
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321 | ///////////////////////////////////////////////////////////////////////////// |
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322 | |
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323 | reconnect_all (); |
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324 | |
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325 | ///////////////////////////////////////////////////////////////////////////// |
228 | |
326 | |
229 | tap = new tap_device (); |
327 | tap = new tap_device (); |
230 | if (!tap) //D this, of course, never catches |
328 | if (!tap) //D this, of course, never catches |
231 | { |
329 | { |
232 | slog (L_ERR, _("cannot create network interface '%s'"), conf.ifname); |
330 | slog (L_ERR, _("cannot create network interface '%s'"), conf.ifname); |
233 | exit (1); |
331 | exit (EXIT_FAILURE); |
234 | } |
332 | } |
235 | |
333 | |
236 | run_script (run_script_cb (this, &vpn::script_if_up), true); |
334 | fcntl (tap->fd, F_SETFD, FD_CLOEXEC); |
237 | |
335 | |
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336 | run_script_cb cb; |
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337 | cb.set<vpn, &vpn::script_if_init> (this); |
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338 | |
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339 | if (tap->if_up () && |
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340 | !run_script (cb, true)) |
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341 | { |
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342 | slog (L_ERR, _("interface initialization command '%s' failed, exiting."), |
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343 | tap->if_up ()); |
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344 | exit (EXIT_FAILURE); |
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345 | } |
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346 | |
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347 | cb.set<vpn, &vpn::script_if_up> (this); |
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348 | if (!run_script (cb, true)) |
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349 | { |
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350 | slog (L_ERR, _("if-up command execution failed, exiting.")); |
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351 | exit (EXIT_FAILURE); |
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352 | } |
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353 | |
238 | tap_ev_watcher.start (tap->fd, POLLIN); |
354 | tap_ev_watcher.start (tap->fd, EV_READ); |
239 | |
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240 | reconnect_all (); |
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241 | |
355 | |
242 | return 0; |
356 | return 0; |
243 | } |
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244 | |
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245 | // send a vpn packet out to other hosts |
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246 | bool |
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247 | vpn::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
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248 | { |
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249 | switch (si.prot) |
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250 | { |
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251 | case PROT_IPv4: |
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252 | return send_ipv4_packet (pkt, si, tos); |
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253 | |
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254 | case PROT_UDPv4: |
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255 | return send_udpv4_packet (pkt, si, tos); |
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256 | |
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|
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; |
|
|
270 | } |
|
|
271 | } |
357 | } |
272 | |
358 | |
273 | bool |
359 | bool |
274 | vpn::send_ipv4_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
360 | vpn::send_ipv4_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
275 | { |
361 | { |
276 | #if defined(SOL_IP) && defined(IP_TOS) |
362 | set_tos (ipv4_fd, ipv4_tos, tos); |
277 | setsockopt (ipv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos); |
|
|
278 | #endif |
|
|
279 | sendto (ipv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ()); |
363 | sendto (ipv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ()); |
280 | |
364 | |
281 | return true; |
365 | return true; |
282 | } |
366 | } |
283 | |
367 | |
… | |
… | |
306 | |
390 | |
307 | #if ENABLE_ICMP |
391 | #if ENABLE_ICMP |
308 | bool |
392 | bool |
309 | vpn::send_icmpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
393 | vpn::send_icmpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
310 | { |
394 | { |
311 | #if defined(SOL_IP) && defined(IP_TOS) |
|
|
312 | setsockopt (icmpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos); |
|
|
313 | #endif |
|
|
314 | |
|
|
315 | pkt->unshift_hdr (4); |
395 | pkt->unshift_hdr (4); |
316 | |
396 | |
317 | icmp_header *hdr = (icmp_header *)&((*pkt)[0]); |
397 | icmp_header *hdr = (icmp_header *)&((*pkt)[0]); |
318 | hdr->type = ::conf.icmp_type; |
398 | hdr->type = ::conf.icmp_type; |
319 | hdr->code = 255; |
399 | hdr->code = 255; |
320 | hdr->checksum = 0; |
400 | hdr->checksum = 0; |
321 | hdr->checksum = ipv4_checksum ((u16 *)hdr, pkt->len); |
401 | hdr->checksum = ipv4_checksum ((u16 *)hdr, pkt->len); |
322 | |
402 | |
|
|
403 | set_tos (icmpv4_fd, icmpv4_tos, tos); |
323 | sendto (icmpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ()); |
404 | sendto (icmpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ()); |
324 | |
405 | |
325 | return true; |
406 | return true; |
326 | } |
407 | } |
327 | #endif |
408 | #endif |
328 | |
409 | |
329 | bool |
410 | bool |
330 | vpn::send_udpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
411 | vpn::send_udpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
331 | { |
412 | { |
332 | #if defined(SOL_IP) && defined(IP_TOS) |
413 | set_tos (udpv4_fd, udpv4_tos, tos); |
333 | setsockopt (udpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos); |
|
|
334 | #endif |
|
|
335 | sendto (udpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ()); |
414 | sendto (udpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ()); |
336 | |
415 | |
337 | return true; |
416 | return true; |
|
|
417 | } |
|
|
418 | |
|
|
419 | void |
|
|
420 | vpn::inject_data_packet (tap_packet *pkt, int dst) |
|
|
421 | { |
|
|
422 | if (dst) |
|
|
423 | { |
|
|
424 | // unicast |
|
|
425 | if (dst != THISNODE->id) |
|
|
426 | conns[dst - 1]->inject_data_packet (pkt); |
|
|
427 | } |
|
|
428 | else |
|
|
429 | { |
|
|
430 | // broadcast, this is ugly, but due to the security policy |
|
|
431 | // we have to connect to all hosts... |
|
|
432 | for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c) |
|
|
433 | if ((*c)->conf != THISNODE) |
|
|
434 | (*c)->inject_data_packet (pkt, true); |
|
|
435 | } |
338 | } |
436 | } |
339 | |
437 | |
340 | void |
438 | void |
341 | vpn::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi) |
439 | vpn::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi) |
342 | { |
440 | { |
… | |
… | |
359 | connection *c = conns[src - 1]; |
457 | connection *c = conns[src - 1]; |
360 | |
458 | |
361 | if (dst == 0) |
459 | if (dst == 0) |
362 | slog (L_WARN, _("%s(%s): received broadcast (protocol violation)"), |
460 | slog (L_WARN, _("%s(%s): received broadcast (protocol violation)"), |
363 | c->conf->nodename, (const char *)rsi); |
461 | c->conf->nodename, (const char *)rsi); |
364 | else if (dst != 0 && dst != THISNODE->id) |
462 | else if (dst != THISNODE->id) |
365 | { |
463 | { |
366 | if (THISNODE->routerprio) |
464 | if (THISNODE->routerprio) |
367 | // the tos setting gets lost here. who cares. |
465 | // the tos setting gets lost here. who cares. |
368 | conns[dst - 1]->inject_vpn_packet (pkt); |
466 | conns[dst - 1]->inject_vpn_packet (pkt); |
369 | else |
467 | else |
… | |
… | |
375 | else |
473 | else |
376 | c->recv_vpn_packet (pkt, rsi); |
474 | c->recv_vpn_packet (pkt, rsi); |
377 | } |
475 | } |
378 | } |
476 | } |
379 | |
477 | |
380 | void |
478 | bool |
|
|
479 | vpn::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
|
|
480 | { |
|
|
481 | switch (si.prot) |
|
|
482 | { |
|
|
483 | case PROT_IPv4: |
|
|
484 | return send_ipv4_packet (pkt, si, tos); |
|
|
485 | |
|
|
486 | case PROT_UDPv4: |
|
|
487 | return send_udpv4_packet (pkt, si, tos); |
|
|
488 | |
|
|
489 | #if ENABLE_TCP |
|
|
490 | case PROT_TCPv4: |
|
|
491 | return send_tcpv4_packet (pkt, si, tos); |
|
|
492 | #endif |
|
|
493 | #if ENABLE_ICMP |
|
|
494 | case PROT_ICMPv4: |
|
|
495 | return send_icmpv4_packet (pkt, si, tos); |
|
|
496 | #endif |
|
|
497 | #if ENABLE_DNS |
|
|
498 | case PROT_DNSv4: |
|
|
499 | return send_dnsv4_packet (pkt, si, tos); |
|
|
500 | #endif |
|
|
501 | default: |
|
|
502 | slog (L_CRIT, _("%s: FATAL: trying to send packet with unsupported protocol"), (const char *)si); |
|
|
503 | } |
|
|
504 | |
|
|
505 | return false; |
|
|
506 | } |
|
|
507 | |
|
|
508 | inline void |
381 | vpn::ipv4_ev (io_watcher &w, short revents) |
509 | vpn::ipv4_ev (ev::io &w, int revents) |
382 | { |
510 | { |
383 | if (revents & (POLLIN | POLLERR)) |
511 | if (revents & EV_READ) |
384 | { |
512 | { |
385 | vpn_packet *pkt = new vpn_packet; |
513 | vpn_packet *pkt = new vpn_packet; |
386 | struct sockaddr_in sa; |
514 | struct sockaddr_in sa; |
387 | socklen_t sa_len = sizeof (sa); |
515 | socklen_t sa_len = sizeof (sa); |
388 | int len; |
516 | int len; |
… | |
… | |
393 | |
521 | |
394 | if (len > 0) |
522 | if (len > 0) |
395 | { |
523 | { |
396 | pkt->len = len; |
524 | pkt->len = len; |
397 | |
525 | |
398 | // raw sockets deliver the ipv4, but don't expect it on sends |
526 | // raw sockets deliver the ipv4 header, but don't expect it on sends |
399 | // this is slow, but... |
|
|
400 | pkt->skip_hdr (IP_OVERHEAD); |
527 | pkt->skip_hdr (IP_OVERHEAD); |
401 | |
528 | |
402 | recv_vpn_packet (pkt, si); |
529 | recv_vpn_packet (pkt, si); |
403 | } |
530 | } |
404 | else |
531 | else |
… | |
… | |
407 | slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno)); |
534 | slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno)); |
408 | } |
535 | } |
409 | |
536 | |
410 | delete pkt; |
537 | delete pkt; |
411 | } |
538 | } |
412 | else if (revents & POLLHUP) |
|
|
413 | { |
|
|
414 | // this cannot ;) happen on udp sockets |
|
|
415 | slog (L_ERR, _("FATAL: POLLHUP on ipv4 fd, terminating.")); |
|
|
416 | exit (1); |
|
|
417 | } |
|
|
418 | else |
539 | else |
419 | { |
540 | { |
420 | slog (L_ERR, |
541 | slog (L_ERR, |
421 | _("FATAL: unknown revents %08x in socket, terminating\n"), |
542 | _("FATAL: unknown revents %08x in socket, terminating\n"), |
422 | revents); |
543 | revents); |
423 | exit (1); |
544 | exit (EXIT_FAILURE); |
424 | } |
545 | } |
425 | } |
546 | } |
426 | |
547 | |
427 | #if ENABLE_ICMP |
548 | #if ENABLE_ICMP |
428 | void |
549 | inline void |
429 | vpn::icmpv4_ev (io_watcher &w, short revents) |
550 | vpn::icmpv4_ev (ev::io &w, int revents) |
430 | { |
551 | { |
431 | if (revents & (POLLIN | POLLERR)) |
552 | if (revents & EV_READ) |
432 | { |
553 | { |
433 | vpn_packet *pkt = new vpn_packet; |
554 | vpn_packet *pkt = new vpn_packet; |
434 | struct sockaddr_in sa; |
555 | struct sockaddr_in sa; |
435 | socklen_t sa_len = sizeof (sa); |
556 | socklen_t sa_len = sizeof (sa); |
436 | int len; |
557 | int len; |
… | |
… | |
461 | slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno)); |
582 | slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno)); |
462 | } |
583 | } |
463 | |
584 | |
464 | delete pkt; |
585 | delete pkt; |
465 | } |
586 | } |
466 | else if (revents & POLLHUP) |
|
|
467 | { |
|
|
468 | // this cannot ;) happen on udp sockets |
|
|
469 | slog (L_ERR, _("FATAL: POLLHUP on icmpv4 fd, terminating.")); |
|
|
470 | exit (1); |
|
|
471 | } |
|
|
472 | else |
587 | else |
473 | { |
588 | { |
474 | slog (L_ERR, |
589 | slog (L_ERR, |
475 | _("FATAL: unknown revents %08x in socket, terminating\n"), |
590 | _("FATAL: unknown revents %08x in socket, terminating\n"), |
476 | revents); |
591 | revents); |
477 | exit (1); |
592 | exit (EXIT_FAILURE); |
478 | } |
593 | } |
479 | } |
594 | } |
480 | #endif |
595 | #endif |
481 | |
596 | |
482 | void |
597 | inline void |
483 | vpn::udpv4_ev (io_watcher &w, short revents) |
598 | vpn::udpv4_ev (ev::io &w, int revents) |
484 | { |
599 | { |
485 | if (revents & (POLLIN | POLLERR)) |
600 | if (revents & EV_READ) |
486 | { |
601 | { |
487 | vpn_packet *pkt = new vpn_packet; |
602 | vpn_packet *pkt = new vpn_packet; |
488 | struct sockaddr_in sa; |
603 | struct sockaddr_in sa; |
489 | socklen_t sa_len = sizeof (sa); |
604 | socklen_t sa_len = sizeof (sa); |
490 | int len; |
605 | int len; |
… | |
… | |
505 | slog (L_DEBUG, _("%s: fd %d, %s"), (const char *)si, w.fd, strerror (errno)); |
620 | slog (L_DEBUG, _("%s: fd %d, %s"), (const char *)si, w.fd, strerror (errno)); |
506 | } |
621 | } |
507 | |
622 | |
508 | delete pkt; |
623 | delete pkt; |
509 | } |
624 | } |
510 | else if (revents & POLLHUP) |
|
|
511 | { |
|
|
512 | // this cannot ;) happen on udp sockets |
|
|
513 | slog (L_ERR, _("FATAL: POLLHUP on udp v4 fd, terminating.")); |
|
|
514 | exit (1); |
|
|
515 | } |
|
|
516 | else |
625 | else |
517 | { |
626 | { |
518 | slog (L_ERR, |
627 | slog (L_ERR, |
519 | _("FATAL: unknown revents %08x in socket, terminating\n"), |
628 | _("FATAL: unknown revents %08x in socket, terminating\n"), |
520 | revents); |
629 | revents); |
521 | exit (1); |
630 | exit (EXIT_FAILURE); |
522 | } |
631 | } |
523 | } |
632 | } |
524 | |
633 | |
525 | void |
634 | inline void |
526 | vpn::tap_ev (io_watcher &w, short revents) |
635 | vpn::tap_ev (ev::io &w, int revents) |
527 | { |
636 | { |
528 | if (revents & POLLIN) |
637 | if (revents & EV_READ) |
529 | { |
638 | { |
530 | /* process data */ |
639 | /* process data */ |
531 | tap_packet *pkt; |
640 | tap_packet *pkt; |
532 | |
641 | |
533 | pkt = tap->recv (); |
642 | pkt = tap->recv (); |
534 | |
643 | |
|
|
644 | if (!pkt) |
|
|
645 | return; |
|
|
646 | |
|
|
647 | if (pkt->len > 14) |
|
|
648 | { |
535 | int dst = mac2id (pkt->dst); |
649 | int dst = mac2id (pkt->dst); |
536 | int src = mac2id (pkt->src); |
650 | int src = mac2id (pkt->src); |
537 | |
651 | |
538 | if (src != THISNODE->id) |
652 | if (src != THISNODE->id) |
539 | { |
|
|
540 | slog (L_ERR, _("FATAL: tap packet not originating on current node received, exiting.")); |
|
|
541 | exit (1); |
|
|
542 | } |
|
|
543 | |
|
|
544 | if (dst == THISNODE->id) |
|
|
545 | { |
|
|
546 | slog (L_ERR, _("FATAL: tap packet destined for current node received, exiting.")); |
|
|
547 | exit (1); |
|
|
548 | } |
|
|
549 | |
|
|
550 | if (dst > conns.size ()) |
|
|
551 | slog (L_ERR, _("tap packet for unknown node %d received, ignoring."), dst); |
|
|
552 | else |
|
|
553 | { |
|
|
554 | if (dst) |
|
|
555 | { |
653 | { |
556 | // unicast |
654 | slog (L_ERR, _("FATAL: tap packet not originating on current node received (if-up script not working properly?), exiting.")); |
557 | if (dst != THISNODE->id) |
655 | exit (EXIT_FAILURE); |
558 | conns[dst - 1]->inject_data_packet (pkt); |
|
|
559 | } |
656 | } |
|
|
657 | |
|
|
658 | if (dst == THISNODE->id) |
|
|
659 | { |
|
|
660 | slog (L_ERR, _("FATAL: tap packet destined for current node received, exiting.")); |
|
|
661 | exit (EXIT_FAILURE); |
|
|
662 | } |
|
|
663 | |
|
|
664 | if (dst > conns.size ()) |
|
|
665 | slog (L_ERR, _("tap packet for unknown node %d received, ignoring."), dst); |
560 | else |
666 | else |
561 | { |
|
|
562 | // broadcast, this is ugly, but due to the security policy |
|
|
563 | // we have to connect to all hosts... |
|
|
564 | for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c) |
|
|
565 | if ((*c)->conf != THISNODE) |
|
|
566 | (*c)->inject_data_packet (pkt); |
667 | inject_data_packet (pkt, dst); |
567 | } |
|
|
568 | } |
668 | } |
569 | |
669 | |
570 | delete pkt; |
670 | delete pkt; |
571 | } |
|
|
572 | else if (revents & (POLLHUP | POLLERR)) |
|
|
573 | { |
|
|
574 | slog (L_ERR, _("FATAL: POLLHUP or POLLERR on network device fd, terminating.")); |
|
|
575 | exit (1); |
|
|
576 | } |
671 | } |
577 | else |
672 | else |
578 | abort (); |
673 | abort (); |
579 | } |
674 | } |
580 | |
675 | |
581 | void |
676 | inline void |
582 | vpn::event_cb (time_watcher &w) |
677 | vpn::event_cb (ev::timer &w, int) |
583 | { |
678 | { |
584 | if (events) |
679 | if (events) |
585 | { |
680 | { |
586 | if (events & EVENT_SHUTDOWN) |
681 | if (events & EVENT_SHUTDOWN) |
587 | { |
682 | { |
588 | slog (L_INFO, _("preparing shutdown...")); |
683 | slog (L_INFO, _("preparing shutdown...")); |
589 | |
684 | |
590 | shutdown_all (); |
685 | shutdown_all (); |
591 | |
|
|
592 | remove_pid (pidfilename); |
686 | remove_pid (conf.pidfilename); |
593 | |
|
|
594 | slog (L_INFO, _("terminating")); |
687 | slog (L_INFO, _("terminating")); |
595 | |
688 | exit (EXIT_SUCCESS); |
596 | exit (0); |
|
|
597 | } |
689 | } |
598 | |
690 | |
599 | if (events & EVENT_RECONNECT) |
691 | if (events & EVENT_RECONNECT) |
600 | { |
692 | { |
601 | slog (L_INFO, _("forced reconnect")); |
693 | slog (L_INFO, _("forced reconnect")); |
… | |
… | |
603 | reconnect_all (); |
695 | reconnect_all (); |
604 | } |
696 | } |
605 | |
697 | |
606 | events = 0; |
698 | events = 0; |
607 | } |
699 | } |
608 | |
|
|
609 | w.at = TSTAMP_CANCEL; |
|
|
610 | } |
700 | } |
611 | |
701 | |
612 | void |
702 | void |
613 | vpn::shutdown_all () |
703 | vpn::shutdown_all () |
614 | { |
704 | { |
… | |
… | |
627 | connection_init (); |
717 | connection_init (); |
628 | |
718 | |
629 | for (configuration::node_vector::iterator i = conf.nodes.begin (); |
719 | for (configuration::node_vector::iterator i = conf.nodes.begin (); |
630 | i != conf.nodes.end (); ++i) |
720 | i != conf.nodes.end (); ++i) |
631 | { |
721 | { |
632 | connection *conn = new connection (this); |
722 | connection *conn = new connection (this, *i); |
633 | |
|
|
634 | conn->conf = *i; |
|
|
635 | conns.push_back (conn); |
723 | conns.push_back (conn); |
636 | |
|
|
637 | conn->establish_connection (); |
724 | conn->establish_connection (); |
638 | } |
725 | } |
639 | } |
726 | } |
640 | |
727 | |
641 | connection *vpn::find_router () |
728 | connection *vpn::find_router () |
… | |
… | |
686 | } |
773 | } |
687 | |
774 | |
688 | void |
775 | void |
689 | vpn::dump_status () |
776 | vpn::dump_status () |
690 | { |
777 | { |
691 | slog (L_NOTICE, _("BEGIN status dump (%ld)"), (long)NOW); |
778 | slog (L_NOTICE, _("BEGIN status dump (%ld)"), (long)ev_now ()); |
692 | |
779 | |
693 | for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c) |
780 | for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c) |
694 | (*c)->dump_status (); |
781 | (*c)->dump_status (); |
695 | |
782 | |
696 | slog (L_NOTICE, _("END status dump")); |
783 | slog (L_NOTICE, _("END status dump")); |
697 | } |
784 | } |
698 | |
785 | |
699 | vpn::vpn (void) |
786 | vpn::vpn (void) |
|
|
787 | { |
700 | : event (this, &vpn::event_cb) |
788 | event .set<vpn, &vpn::event_cb > (this); |
701 | , udpv4_ev_watcher (this, &vpn::udpv4_ev) |
789 | udpv4_ev_watcher .set<vpn, &vpn::udpv4_ev > (this); |
702 | , ipv4_ev_watcher (this, &vpn::ipv4_ev) |
790 | ipv4_ev_watcher .set<vpn, &vpn::ipv4_ev > (this); |
703 | #if ENABLE_TCP |
791 | #if ENABLE_TCP |
704 | , tcpv4_ev_watcher (this, &vpn::tcpv4_ev) |
792 | tcpv4_ev_watcher .set<vpn, &vpn::tcpv4_ev > (this); |
705 | #endif |
793 | #endif |
706 | #if ENABLE_ICMP |
794 | #if ENABLE_ICMP |
707 | , icmpv4_ev_watcher(this, &vpn::icmpv4_ev) |
795 | icmpv4_ev_watcher.set<vpn, &vpn::icmpv4_ev> (this); |
708 | #endif |
796 | #endif |
709 | , tap_ev_watcher (this, &vpn::tap_ev) |
797 | #if ENABLE_DNS |
710 | { |
798 | dnsv4_ev_watcher .set<vpn, &vpn::dnsv4_ev > (this); |
|
|
799 | #endif |
|
|
800 | tap_ev_watcher .set<vpn, &vpn::tap_ev > (this); |
711 | } |
801 | } |
712 | |
802 | |
713 | vpn::~vpn () |
803 | vpn::~vpn () |
714 | { |
804 | { |
715 | } |
805 | } |