1 | /* |
1 | /* |
2 | vpn.C -- handle the protocol, encryption, handshaking etc. |
2 | vpn.C -- handle the protocol, encryption, handshaking etc. |
3 | Copyright (C) 2003 Marc Lehmann <pcg@goof.com> |
3 | Copyright (C) 2003-2007 Marc Lehmann <gvpe@schmorp.de> |
4 | |
4 | |
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5 | This file is part of GVPE. |
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6 | |
5 | This program is free software; you can redistribute it and/or modify |
7 | GVPE is free software; you can redistribute it and/or modify |
6 | 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 |
7 | the Free Software Foundation; either version 2 of the License, or |
9 | the Free Software Foundation; either version 2 of the License, or |
8 | (at your option) any later version. |
10 | (at your option) any later version. |
9 | |
11 | |
10 | 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, |
11 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
13 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
13 | GNU General Public License for more details. |
15 | GNU General Public License for more details. |
14 | |
16 | |
15 | 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 |
16 | along with this program; if not, write to the Free Software |
18 | along with gvpe; if not, write to the Free Software |
17 | 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 |
18 | */ |
20 | */ |
19 | |
21 | |
20 | #include "config.h" |
22 | #include "config.h" |
21 | |
23 | |
22 | #include <list> |
24 | #include <list> |
23 | |
25 | |
|
|
26 | #include <cstdio> |
|
|
27 | #include <cstring> |
24 | #include <cstdlib> |
28 | #include <cstdlib> |
25 | #include <cstring> |
|
|
26 | #include <cstdio> |
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27 | |
29 | |
28 | #include <sys/types.h> |
30 | #include <sys/types.h> |
29 | #include <sys/socket.h> |
31 | #include <sys/socket.h> |
30 | #include <sys/wait.h> |
32 | #include <sys/wait.h> |
31 | #include <errno.h> |
33 | #include <errno.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 | |
|
|
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); |
|
|
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); |
|
|
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 | const char *vpn::script_if_init () |
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93 | { |
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94 | script_init_env (); |
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95 | |
|
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96 | return tap->if_up (); |
|
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97 | } |
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98 | |
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99 | const char *vpn::script_if_up () |
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100 | { |
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101 | script_init_env (); |
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102 | |
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103 | char *filename; |
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104 | asprintf (&filename, |
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105 | "%s/%s", |
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106 | confbase, |
72 | return ::conf.script_if_up ? ::conf.script_if_up : "if-up"; |
107 | ::conf.script_if_up ? ::conf.script_if_up : "if-up"); |
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108 | |
|
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109 | return filename; |
73 | } |
110 | } |
74 | |
111 | |
75 | int |
112 | int |
76 | vpn::setup () |
113 | vpn::setup () |
77 | { |
114 | { |
|
|
115 | ipv4_tos = -1; |
78 | ipv4_fd = -1; |
116 | ipv4_fd = -1; |
79 | |
117 | |
80 | if (THISNODE->protocols & PROT_IPv4 && ::conf.ip_proto) |
118 | if (THISNODE->protocols & PROT_IPv4 && ::conf.ip_proto) |
81 | { |
119 | { |
82 | ipv4_fd = socket (PF_INET, SOCK_RAW, ::conf.ip_proto); |
120 | ipv4_fd = socket (PF_INET, SOCK_RAW, ::conf.ip_proto); |
83 | |
121 | |
84 | if (ipv4_fd < 0) |
122 | if (ipv4_fd < 0) |
85 | return -1; |
123 | return -1; |
86 | |
124 | |
87 | fcntl (ipv4_fd, F_SETFL, O_NONBLOCK); |
125 | fcntl (ipv4_fd, F_SETFL, O_NONBLOCK); |
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126 | fcntl (ipv4_fd, F_SETFD, FD_CLOEXEC); |
88 | |
127 | |
89 | #if defined(SOL_IP) && defined(IP_MTU_DISCOVER) |
128 | #if defined(SOL_IP) && defined(IP_MTU_DISCOVER) |
90 | // this I really consider a linux bug. I am neither connected |
129 | // this I really consider a linux bug. I am neither connected |
91 | // nor do I fragment myself. Linux still sets DF and doesn't |
130 | // nor do I fragment myself. Linux still sets DF and doesn't |
92 | // fragment for me sometimes. |
131 | // fragment for me sometimes. |
… | |
… | |
99 | sockinfo si (THISNODE, PROT_IPv4); |
138 | sockinfo si (THISNODE, PROT_IPv4); |
100 | |
139 | |
101 | if (bind (ipv4_fd, si.sav4 (), si.salenv4 ())) |
140 | if (bind (ipv4_fd, si.sav4 (), si.salenv4 ())) |
102 | { |
141 | { |
103 | slog (L_ERR, _("can't bind ipv4 socket on %s: %s"), (const char *)si, strerror (errno)); |
142 | slog (L_ERR, _("can't bind ipv4 socket on %s: %s"), (const char *)si, strerror (errno)); |
104 | exit (1); |
143 | exit (EXIT_FAILURE); |
105 | } |
144 | } |
106 | |
145 | |
107 | ipv4_ev_watcher.start (ipv4_fd, POLLIN); |
146 | ipv4_ev_watcher.start (ipv4_fd, EV_READ); |
108 | } |
147 | } |
109 | |
148 | |
|
|
149 | udpv4_tos = -1; |
110 | udpv4_fd = -1; |
150 | udpv4_fd = -1; |
111 | |
151 | |
112 | if (THISNODE->protocols & PROT_UDPv4 && THISNODE->udp_port) |
152 | if (THISNODE->protocols & PROT_UDPv4 && THISNODE->udp_port) |
113 | { |
153 | { |
114 | udpv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP); |
154 | udpv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP); |
115 | |
155 | |
116 | if (udpv4_fd < 0) |
156 | if (udpv4_fd < 0) |
117 | return -1; |
157 | return -1; |
118 | |
158 | |
119 | fcntl (udpv4_fd, F_SETFL, O_NONBLOCK); |
159 | fcntl (udpv4_fd, F_SETFL, O_NONBLOCK); |
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|
160 | fcntl (udpv4_fd, F_SETFD, FD_CLOEXEC); |
120 | |
161 | |
121 | // standard daemon practise... |
162 | // standard daemon practise... |
122 | { |
163 | { |
123 | int oval = 1; |
164 | int oval = 1; |
124 | setsockopt (udpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval); |
165 | setsockopt (udpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval); |
… | |
… | |
137 | sockinfo si (THISNODE, PROT_UDPv4); |
178 | sockinfo si (THISNODE, PROT_UDPv4); |
138 | |
179 | |
139 | if (bind (udpv4_fd, si.sav4 (), si.salenv4 ())) |
180 | if (bind (udpv4_fd, si.sav4 (), si.salenv4 ())) |
140 | { |
181 | { |
141 | slog (L_ERR, _("can't bind udpv4 on %s: %s"), (const char *)si, strerror (errno)); |
182 | slog (L_ERR, _("can't bind udpv4 on %s: %s"), (const char *)si, strerror (errno)); |
142 | exit (1); |
183 | exit (EXIT_FAILURE); |
143 | } |
184 | } |
144 | |
185 | |
145 | udpv4_ev_watcher.start (udpv4_fd, POLLIN); |
186 | udpv4_ev_watcher.start (udpv4_fd, EV_READ); |
146 | } |
187 | } |
147 | |
188 | |
|
|
189 | icmpv4_tos = -1; |
148 | icmpv4_fd = -1; |
190 | icmpv4_fd = -1; |
149 | |
191 | |
150 | #if ENABLE_ICMP |
192 | #if ENABLE_ICMP |
151 | if (THISNODE->protocols & PROT_ICMPv4) |
193 | if (THISNODE->protocols & PROT_ICMPv4) |
152 | { |
194 | { |
153 | icmpv4_fd = socket (PF_INET, SOCK_RAW, IPPROTO_ICMP); |
195 | icmpv4_fd = socket (PF_INET, SOCK_RAW, IPPROTO_ICMP); |
154 | |
196 | |
155 | if (icmpv4_fd < 0) |
197 | if (icmpv4_fd < 0) |
156 | return -1; |
198 | return -1; |
157 | |
199 | |
158 | fcntl (icmpv4_fd, F_SETFL, O_NONBLOCK); |
200 | fcntl (icmpv4_fd, F_SETFL, O_NONBLOCK); |
|
|
201 | fcntl (icmpv4_fd, F_SETFD, FD_CLOEXEC); |
159 | |
202 | |
160 | #ifdef ICMP_FILTER |
203 | #ifdef ICMP_FILTER |
161 | { |
204 | { |
162 | icmp_filter oval; |
205 | icmp_filter oval; |
163 | oval.data = 0xffffffff; |
206 | oval.data = 0xffffffff; |
… | |
… | |
172 | // this I really consider a linux bug. I am neither connected |
215 | // this I really consider a linux bug. I am neither connected |
173 | // nor do I fragment myself. Linux still sets DF and doesn't |
216 | // nor do I fragment myself. Linux still sets DF and doesn't |
174 | // fragment for me sometimes. |
217 | // fragment for me sometimes. |
175 | { |
218 | { |
176 | int oval = IP_PMTUDISC_DONT; |
219 | int oval = IP_PMTUDISC_DONT; |
177 | setsockopt (udpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval); |
220 | setsockopt (icmpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval); |
178 | } |
221 | } |
179 | #endif |
222 | #endif |
180 | |
223 | |
181 | sockinfo si (THISNODE, PROT_ICMPv4); |
224 | sockinfo si (THISNODE, PROT_ICMPv4); |
182 | |
225 | |
183 | if (bind (icmpv4_fd, si.sav4 (), si.salenv4 ())) |
226 | if (bind (icmpv4_fd, si.sav4 (), si.salenv4 ())) |
184 | { |
227 | { |
185 | slog (L_ERR, _("can't bind icmpv4 on %s: %s"), (const char *)si, strerror (errno)); |
228 | slog (L_ERR, _("can't bind icmpv4 on %s: %s"), (const char *)si, strerror (errno)); |
186 | exit (1); |
229 | exit (EXIT_FAILURE); |
187 | } |
230 | } |
188 | |
231 | |
189 | icmpv4_ev_watcher.start (icmpv4_fd, POLLIN); |
232 | icmpv4_ev_watcher.start (icmpv4_fd, EV_READ); |
190 | } |
233 | } |
191 | #endif |
234 | #endif |
192 | |
235 | |
193 | tcpv4_fd = -1; |
236 | tcpv4_fd = -1; |
194 | |
237 | |
… | |
… | |
199 | |
242 | |
200 | if (tcpv4_fd < 0) |
243 | if (tcpv4_fd < 0) |
201 | return -1; |
244 | return -1; |
202 | |
245 | |
203 | fcntl (tcpv4_fd, F_SETFL, O_NONBLOCK); |
246 | fcntl (tcpv4_fd, F_SETFL, O_NONBLOCK); |
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247 | fcntl (tcpv4_fd, F_SETFD, FD_CLOEXEC); |
204 | |
248 | |
205 | // standard daemon practise... |
249 | // standard daemon practise... |
206 | { |
250 | { |
207 | int oval = 1; |
251 | int oval = 1; |
208 | setsockopt (tcpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval); |
252 | setsockopt (tcpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval); |
… | |
… | |
211 | sockinfo si (THISNODE, PROT_TCPv4); |
255 | sockinfo si (THISNODE, PROT_TCPv4); |
212 | |
256 | |
213 | if (bind (tcpv4_fd, si.sav4 (), si.salenv4 ())) |
257 | if (bind (tcpv4_fd, si.sav4 (), si.salenv4 ())) |
214 | { |
258 | { |
215 | slog (L_ERR, _("can't bind tcpv4 on %s: %s"), (const char *)si, strerror (errno)); |
259 | slog (L_ERR, _("can't bind tcpv4 on %s: %s"), (const char *)si, strerror (errno)); |
216 | exit (1); |
260 | exit (EXIT_FAILURE); |
217 | } |
261 | } |
218 | |
262 | |
219 | if (listen (tcpv4_fd, 5)) |
263 | if (listen (tcpv4_fd, 5)) |
220 | { |
264 | { |
221 | slog (L_ERR, _("can't listen tcpv4 on %s: %s"), (const char *)si, strerror (errno)); |
265 | slog (L_ERR, _("can't listen tcpv4 on %s: %s"), (const char *)si, strerror (errno)); |
222 | exit (1); |
266 | exit (EXIT_FAILURE); |
|
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267 | } |
|
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268 | |
|
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269 | tcpv4_ev_watcher.start (tcpv4_fd, EV_READ); |
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270 | } |
|
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271 | #endif |
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272 | |
|
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273 | dnsv4_tos = -1; |
|
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274 | dnsv4_fd = -1; |
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275 | |
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276 | #if ENABLE_DNS |
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277 | if (THISNODE->protocols & PROT_DNSv4) |
|
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278 | { |
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279 | dns_forwarder.set (::conf.dns_forw_host, ::conf.dns_forw_port, PROT_DNSv4); |
|
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280 | |
|
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281 | dnsv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP); |
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282 | |
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283 | if (dnsv4_fd < 0) |
|
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284 | return -1; |
|
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285 | |
|
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286 | fcntl (dnsv4_fd, F_SETFL, O_NONBLOCK); |
|
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287 | fcntl (dnsv4_fd, F_SETFD, FD_CLOEXEC); |
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288 | |
|
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289 | # if defined(SOL_IP) && defined(IP_MTU_DISCOVER) |
|
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290 | // this I really consider a linux bug. I am neither connected |
|
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291 | // nor do I fragment myself. Linux still sets DF and doesn't |
|
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292 | // fragment for me sometimes. |
|
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293 | { |
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294 | int oval = IP_PMTUDISC_DONT; |
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295 | setsockopt (dnsv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval); |
223 | } |
296 | } |
224 | |
|
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225 | tcpv4_ev_watcher.start (tcpv4_fd, POLLIN); |
|
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226 | } |
|
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227 | #endif |
297 | # endif |
|
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298 | |
|
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299 | // standard daemon practise... |
|
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300 | { |
|
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301 | int oval = 1; |
|
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302 | setsockopt (dnsv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval); |
|
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303 | } |
|
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304 | |
|
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305 | sockinfo si (THISNODE->dns_hostname, |
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306 | THISNODE->dns_hostname ? THISNODE->dns_port : 0, |
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307 | PROT_DNSv4); |
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308 | |
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309 | if (bind (dnsv4_fd, si.sav4 (), si.salenv4 ())) |
|
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310 | { |
|
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311 | slog (L_ERR, _("can't bind dnsv4 on %s: %s"), (const char *)si, strerror (errno)); |
|
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312 | exit (EXIT_FAILURE); |
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313 | } |
|
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314 | |
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315 | dnsv4_ev_watcher.start (dnsv4_fd, EV_READ); |
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316 | } |
|
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317 | #endif |
|
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318 | |
|
|
319 | ///////////////////////////////////////////////////////////////////////////// |
|
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320 | |
|
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321 | reconnect_all (); |
|
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322 | |
|
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323 | ///////////////////////////////////////////////////////////////////////////// |
228 | |
324 | |
229 | tap = new tap_device (); |
325 | tap = new tap_device (); |
230 | if (!tap) //D this, of course, never catches |
326 | if (!tap) //D this, of course, never catches |
231 | { |
327 | { |
232 | slog (L_ERR, _("cannot create network interface '%s'"), conf.ifname); |
328 | slog (L_ERR, _("cannot create network interface '%s'"), conf.ifname); |
233 | exit (1); |
329 | exit (EXIT_FAILURE); |
234 | } |
330 | } |
235 | |
331 | |
236 | run_script (run_script_cb (this, &vpn::script_if_up), true); |
332 | fcntl (tap->fd, F_SETFD, FD_CLOEXEC); |
237 | |
333 | |
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334 | run_script_cb cb; |
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335 | cb.set<vpn, &vpn::script_if_init> (this); |
|
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336 | |
|
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337 | if (tap->if_up () && |
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338 | !run_script (cb, true)) |
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339 | { |
|
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340 | slog (L_ERR, _("interface initialization command '%s' failed, exiting."), |
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341 | tap->if_up ()); |
|
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342 | exit (EXIT_FAILURE); |
|
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343 | } |
|
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344 | |
|
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345 | cb.set<vpn, &vpn::script_if_up> (this); |
|
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346 | if (!run_script (cb, true)) |
|
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347 | { |
|
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348 | slog (L_ERR, _("if-up command execution failed, exiting.")); |
|
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349 | exit (EXIT_FAILURE); |
|
|
350 | } |
|
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351 | |
238 | tap_ev_watcher.start (tap->fd, POLLIN); |
352 | tap_ev_watcher.start (tap->fd, EV_READ); |
239 | |
|
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240 | reconnect_all (); |
|
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241 | |
353 | |
242 | return 0; |
354 | return 0; |
243 | } |
|
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244 | |
|
|
245 | // send a vpn packet out to other hosts |
|
|
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 | { |
|
|
251 | case PROT_IPv4: |
|
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252 | return send_ipv4_packet (pkt, si, tos); |
|
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253 | |
|
|
254 | case PROT_UDPv4: |
|
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255 | return send_udpv4_packet (pkt, si, tos); |
|
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256 | |
|
|
257 | #if ENABLE_TCP |
|
|
258 | case PROT_TCPv4: |
|
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259 | return send_tcpv4_packet (pkt, si, tos); |
|
|
260 | #endif |
|
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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 | } |
355 | } |
272 | |
356 | |
273 | bool |
357 | bool |
274 | vpn::send_ipv4_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
358 | vpn::send_ipv4_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
275 | { |
359 | { |
276 | #if defined(SOL_IP) && defined(IP_TOS) |
360 | 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 ()); |
361 | sendto (ipv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ()); |
280 | |
362 | |
281 | return true; |
363 | return true; |
282 | } |
364 | } |
283 | |
365 | |
… | |
… | |
306 | |
388 | |
307 | #if ENABLE_ICMP |
389 | #if ENABLE_ICMP |
308 | bool |
390 | bool |
309 | vpn::send_icmpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
391 | vpn::send_icmpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
310 | { |
392 | { |
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); |
393 | pkt->unshift_hdr (4); |
316 | |
394 | |
317 | icmp_header *hdr = (icmp_header *)&((*pkt)[0]); |
395 | icmp_header *hdr = (icmp_header *)&((*pkt)[0]); |
318 | hdr->type = ::conf.icmp_type; |
396 | hdr->type = ::conf.icmp_type; |
319 | hdr->code = 255; |
397 | hdr->code = 255; |
320 | hdr->checksum = 0; |
398 | hdr->checksum = 0; |
321 | hdr->checksum = ipv4_checksum ((u16 *)hdr, pkt->len); |
399 | hdr->checksum = ipv4_checksum ((u16 *)hdr, pkt->len); |
322 | |
400 | |
|
|
401 | set_tos (icmpv4_fd, icmpv4_tos, tos); |
323 | sendto (icmpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ()); |
402 | sendto (icmpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ()); |
324 | |
403 | |
325 | return true; |
404 | return true; |
326 | } |
405 | } |
327 | #endif |
406 | #endif |
328 | |
407 | |
329 | bool |
408 | bool |
330 | vpn::send_udpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
409 | vpn::send_udpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
331 | { |
410 | { |
332 | #if defined(SOL_IP) && defined(IP_TOS) |
411 | 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 ()); |
412 | sendto (udpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ()); |
336 | |
413 | |
337 | return true; |
414 | return true; |
338 | } |
415 | } |
339 | |
416 | |
… | |
… | |
394 | else |
471 | else |
395 | c->recv_vpn_packet (pkt, rsi); |
472 | c->recv_vpn_packet (pkt, rsi); |
396 | } |
473 | } |
397 | } |
474 | } |
398 | |
475 | |
|
|
476 | bool |
|
|
477 | vpn::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
|
|
478 | { |
|
|
479 | switch (si.prot) |
|
|
480 | { |
|
|
481 | case PROT_IPv4: |
|
|
482 | return send_ipv4_packet (pkt, si, tos); |
|
|
483 | |
|
|
484 | case PROT_UDPv4: |
|
|
485 | return send_udpv4_packet (pkt, si, tos); |
|
|
486 | |
|
|
487 | #if ENABLE_TCP |
|
|
488 | case PROT_TCPv4: |
|
|
489 | return send_tcpv4_packet (pkt, si, tos); |
|
|
490 | #endif |
|
|
491 | #if ENABLE_ICMP |
|
|
492 | case PROT_ICMPv4: |
|
|
493 | return send_icmpv4_packet (pkt, si, tos); |
|
|
494 | #endif |
|
|
495 | #if ENABLE_DNS |
|
|
496 | case PROT_DNSv4: |
|
|
497 | return send_dnsv4_packet (pkt, si, tos); |
|
|
498 | #endif |
|
|
499 | default: |
|
|
500 | slog (L_CRIT, _("%s: FATAL: trying to send packet with unsupported protocol"), (const char *)si); |
|
|
501 | } |
|
|
502 | |
|
|
503 | return false; |
|
|
504 | } |
|
|
505 | |
399 | void |
506 | void |
400 | vpn::ipv4_ev (io_watcher &w, short revents) |
507 | vpn::ipv4_ev (ev::io &w, int revents) |
401 | { |
508 | { |
402 | if (revents & (POLLIN | POLLERR)) |
509 | if (revents & EV_READ) |
403 | { |
510 | { |
404 | vpn_packet *pkt = new vpn_packet; |
511 | vpn_packet *pkt = new vpn_packet; |
405 | struct sockaddr_in sa; |
512 | struct sockaddr_in sa; |
406 | socklen_t sa_len = sizeof (sa); |
513 | socklen_t sa_len = sizeof (sa); |
407 | int len; |
514 | int len; |
… | |
… | |
412 | |
519 | |
413 | if (len > 0) |
520 | if (len > 0) |
414 | { |
521 | { |
415 | pkt->len = len; |
522 | pkt->len = len; |
416 | |
523 | |
417 | // raw sockets deliver the ipv4, but don't expect it on sends |
524 | // raw sockets deliver the ipv4 header, but don't expect it on sends |
418 | // this is slow, but... |
|
|
419 | pkt->skip_hdr (IP_OVERHEAD); |
525 | pkt->skip_hdr (IP_OVERHEAD); |
420 | |
526 | |
421 | recv_vpn_packet (pkt, si); |
527 | recv_vpn_packet (pkt, si); |
422 | } |
528 | } |
423 | else |
529 | else |
… | |
… | |
426 | slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno)); |
532 | slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno)); |
427 | } |
533 | } |
428 | |
534 | |
429 | delete pkt; |
535 | delete pkt; |
430 | } |
536 | } |
431 | else if (revents & POLLHUP) |
|
|
432 | { |
|
|
433 | // this cannot ;) happen on udp sockets |
|
|
434 | slog (L_ERR, _("FATAL: POLLHUP on ipv4 fd, terminating.")); |
|
|
435 | exit (1); |
|
|
436 | } |
|
|
437 | else |
537 | else |
438 | { |
538 | { |
439 | slog (L_ERR, |
539 | slog (L_ERR, |
440 | _("FATAL: unknown revents %08x in socket, terminating\n"), |
540 | _("FATAL: unknown revents %08x in socket, terminating\n"), |
441 | revents); |
541 | revents); |
442 | exit (1); |
542 | exit (EXIT_FAILURE); |
443 | } |
543 | } |
444 | } |
544 | } |
445 | |
545 | |
446 | #if ENABLE_ICMP |
546 | #if ENABLE_ICMP |
447 | void |
547 | void |
448 | vpn::icmpv4_ev (io_watcher &w, short revents) |
548 | vpn::icmpv4_ev (ev::io &w, int revents) |
449 | { |
549 | { |
450 | if (revents & (POLLIN | POLLERR)) |
550 | if (revents & EV_READ) |
451 | { |
551 | { |
452 | vpn_packet *pkt = new vpn_packet; |
552 | vpn_packet *pkt = new vpn_packet; |
453 | struct sockaddr_in sa; |
553 | struct sockaddr_in sa; |
454 | socklen_t sa_len = sizeof (sa); |
554 | socklen_t sa_len = sizeof (sa); |
455 | int len; |
555 | int len; |
… | |
… | |
480 | slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno)); |
580 | slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno)); |
481 | } |
581 | } |
482 | |
582 | |
483 | delete pkt; |
583 | delete pkt; |
484 | } |
584 | } |
485 | else if (revents & POLLHUP) |
|
|
486 | { |
|
|
487 | // this cannot ;) happen on udp sockets |
|
|
488 | slog (L_ERR, _("FATAL: POLLHUP on icmpv4 fd, terminating.")); |
|
|
489 | exit (1); |
|
|
490 | } |
|
|
491 | else |
585 | else |
492 | { |
586 | { |
493 | slog (L_ERR, |
587 | slog (L_ERR, |
494 | _("FATAL: unknown revents %08x in socket, terminating\n"), |
588 | _("FATAL: unknown revents %08x in socket, terminating\n"), |
495 | revents); |
589 | revents); |
496 | exit (1); |
590 | exit (EXIT_FAILURE); |
497 | } |
591 | } |
498 | } |
592 | } |
499 | #endif |
593 | #endif |
500 | |
594 | |
501 | void |
595 | void |
502 | vpn::udpv4_ev (io_watcher &w, short revents) |
596 | vpn::udpv4_ev (ev::io &w, int revents) |
503 | { |
597 | { |
504 | if (revents & (POLLIN | POLLERR)) |
598 | if (revents & EV_READ) |
505 | { |
599 | { |
506 | vpn_packet *pkt = new vpn_packet; |
600 | vpn_packet *pkt = new vpn_packet; |
507 | struct sockaddr_in sa; |
601 | struct sockaddr_in sa; |
508 | socklen_t sa_len = sizeof (sa); |
602 | socklen_t sa_len = sizeof (sa); |
509 | int len; |
603 | int len; |
… | |
… | |
524 | slog (L_DEBUG, _("%s: fd %d, %s"), (const char *)si, w.fd, strerror (errno)); |
618 | slog (L_DEBUG, _("%s: fd %d, %s"), (const char *)si, w.fd, strerror (errno)); |
525 | } |
619 | } |
526 | |
620 | |
527 | delete pkt; |
621 | delete pkt; |
528 | } |
622 | } |
529 | else if (revents & POLLHUP) |
|
|
530 | { |
|
|
531 | // this cannot ;) happen on udp sockets |
|
|
532 | slog (L_ERR, _("FATAL: POLLHUP on udp v4 fd, terminating.")); |
|
|
533 | exit (1); |
|
|
534 | } |
|
|
535 | else |
623 | else |
536 | { |
624 | { |
537 | slog (L_ERR, |
625 | slog (L_ERR, |
538 | _("FATAL: unknown revents %08x in socket, terminating\n"), |
626 | _("FATAL: unknown revents %08x in socket, terminating\n"), |
539 | revents); |
627 | revents); |
540 | exit (1); |
628 | exit (EXIT_FAILURE); |
541 | } |
629 | } |
542 | } |
630 | } |
543 | |
631 | |
544 | void |
632 | void |
545 | vpn::tap_ev (io_watcher &w, short revents) |
633 | vpn::tap_ev (ev::io &w, int revents) |
546 | { |
634 | { |
547 | if (revents & POLLIN) |
635 | if (revents & EV_READ) |
548 | { |
636 | { |
549 | /* process data */ |
637 | /* process data */ |
550 | tap_packet *pkt; |
638 | tap_packet *pkt; |
551 | |
639 | |
552 | pkt = tap->recv (); |
640 | pkt = tap->recv (); |
… | |
… | |
559 | int dst = mac2id (pkt->dst); |
647 | int dst = mac2id (pkt->dst); |
560 | int src = mac2id (pkt->src); |
648 | int src = mac2id (pkt->src); |
561 | |
649 | |
562 | if (src != THISNODE->id) |
650 | if (src != THISNODE->id) |
563 | { |
651 | { |
564 | slog (L_ERR, _("FATAL: tap packet not originating on current node received, exiting.")); |
652 | slog (L_ERR, _("FATAL: tap packet not originating on current node received (if-up script not working properly?), exiting.")); |
565 | exit (1); |
653 | exit (EXIT_FAILURE); |
566 | } |
654 | } |
567 | |
655 | |
568 | if (dst == THISNODE->id) |
656 | if (dst == THISNODE->id) |
569 | { |
657 | { |
570 | slog (L_ERR, _("FATAL: tap packet destined for current node received, exiting.")); |
658 | slog (L_ERR, _("FATAL: tap packet destined for current node received, exiting.")); |
571 | exit (1); |
659 | exit (EXIT_FAILURE); |
572 | } |
660 | } |
573 | |
661 | |
574 | if (dst > conns.size ()) |
662 | if (dst > conns.size ()) |
575 | slog (L_ERR, _("tap packet for unknown node %d received, ignoring."), dst); |
663 | slog (L_ERR, _("tap packet for unknown node %d received, ignoring."), dst); |
576 | else |
664 | else |
577 | inject_data_packet (pkt, dst); |
665 | inject_data_packet (pkt, dst); |
578 | } |
666 | } |
579 | |
667 | |
580 | delete pkt; |
668 | delete pkt; |
581 | } |
669 | } |
582 | else if (revents & (POLLHUP | POLLERR)) |
|
|
583 | { |
|
|
584 | slog (L_ERR, _("FATAL: POLLHUP or POLLERR on network device fd, terminating.")); |
|
|
585 | exit (1); |
|
|
586 | } |
|
|
587 | else |
670 | else |
588 | abort (); |
671 | abort (); |
589 | } |
672 | } |
590 | |
673 | |
591 | void |
674 | void |
592 | vpn::event_cb (time_watcher &w) |
675 | vpn::event_cb (ev::timer &w, int) |
593 | { |
676 | { |
594 | if (events) |
677 | if (events) |
595 | { |
678 | { |
596 | if (events & EVENT_SHUTDOWN) |
679 | if (events & EVENT_SHUTDOWN) |
597 | { |
680 | { |
598 | slog (L_INFO, _("preparing shutdown...")); |
681 | slog (L_INFO, _("preparing shutdown...")); |
599 | |
682 | |
600 | shutdown_all (); |
683 | shutdown_all (); |
601 | |
|
|
602 | remove_pid (pidfilename); |
684 | remove_pid (conf.pidfilename); |
603 | |
|
|
604 | slog (L_INFO, _("terminating")); |
685 | slog (L_INFO, _("terminating")); |
605 | |
686 | exit (EXIT_SUCCESS); |
606 | exit (0); |
|
|
607 | } |
687 | } |
608 | |
688 | |
609 | if (events & EVENT_RECONNECT) |
689 | if (events & EVENT_RECONNECT) |
610 | { |
690 | { |
611 | slog (L_INFO, _("forced reconnect")); |
691 | slog (L_INFO, _("forced reconnect")); |
… | |
… | |
613 | reconnect_all (); |
693 | reconnect_all (); |
614 | } |
694 | } |
615 | |
695 | |
616 | events = 0; |
696 | events = 0; |
617 | } |
697 | } |
618 | |
|
|
619 | w.at = TSTAMP_CANCEL; |
|
|
620 | } |
698 | } |
621 | |
699 | |
622 | void |
700 | void |
623 | vpn::shutdown_all () |
701 | vpn::shutdown_all () |
624 | { |
702 | { |
… | |
… | |
637 | connection_init (); |
715 | connection_init (); |
638 | |
716 | |
639 | for (configuration::node_vector::iterator i = conf.nodes.begin (); |
717 | for (configuration::node_vector::iterator i = conf.nodes.begin (); |
640 | i != conf.nodes.end (); ++i) |
718 | i != conf.nodes.end (); ++i) |
641 | { |
719 | { |
642 | connection *conn = new connection (this); |
720 | connection *conn = new connection (this, *i); |
643 | |
|
|
644 | conn->conf = *i; |
|
|
645 | conns.push_back (conn); |
721 | conns.push_back (conn); |
646 | |
|
|
647 | conn->establish_connection (); |
722 | conn->establish_connection (); |
648 | } |
723 | } |
649 | } |
724 | } |
650 | |
725 | |
651 | connection *vpn::find_router () |
726 | connection *vpn::find_router () |
… | |
… | |
696 | } |
771 | } |
697 | |
772 | |
698 | void |
773 | void |
699 | vpn::dump_status () |
774 | vpn::dump_status () |
700 | { |
775 | { |
701 | slog (L_NOTICE, _("BEGIN status dump (%ld)"), (long)NOW); |
776 | slog (L_NOTICE, _("BEGIN status dump (%ld)"), (long)ev_now ()); |
702 | |
777 | |
703 | for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c) |
778 | for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c) |
704 | (*c)->dump_status (); |
779 | (*c)->dump_status (); |
705 | |
780 | |
706 | slog (L_NOTICE, _("END status dump")); |
781 | slog (L_NOTICE, _("END status dump")); |
707 | } |
782 | } |
708 | |
783 | |
709 | vpn::vpn (void) |
784 | vpn::vpn (void) |
|
|
785 | { |
710 | : event (this, &vpn::event_cb) |
786 | event .set<vpn, &vpn::event_cb > (this); |
711 | , udpv4_ev_watcher (this, &vpn::udpv4_ev) |
787 | udpv4_ev_watcher .set<vpn, &vpn::udpv4_ev > (this); |
712 | , ipv4_ev_watcher (this, &vpn::ipv4_ev) |
788 | ipv4_ev_watcher .set<vpn, &vpn::ipv4_ev > (this); |
713 | #if ENABLE_TCP |
789 | #if ENABLE_TCP |
714 | , tcpv4_ev_watcher (this, &vpn::tcpv4_ev) |
790 | tcpv4_ev_watcher .set<vpn, &vpn::tcpv4_ev > (this); |
715 | #endif |
791 | #endif |
716 | #if ENABLE_ICMP |
792 | #if ENABLE_ICMP |
717 | , icmpv4_ev_watcher(this, &vpn::icmpv4_ev) |
793 | icmpv4_ev_watcher.set<vpn, &vpn::icmpv4_ev> (this); |
718 | #endif |
794 | #endif |
719 | , tap_ev_watcher (this, &vpn::tap_ev) |
795 | #if ENABLE_DNS |
720 | { |
796 | dnsv4_ev_watcher .set<vpn, &vpn::dnsv4_ev > (this); |
|
|
797 | #endif |
|
|
798 | tap_ev_watcher .set<vpn, &vpn::tap_ev > (this); |
721 | } |
799 | } |
722 | |
800 | |
723 | vpn::~vpn () |
801 | vpn::~vpn () |
724 | { |
802 | { |
725 | } |
803 | } |