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/wait.h> |
32 | #include <sys/wait.h> |
30 | #include <errno.h> |
33 | #include <errno.h> |
… | |
… | |
39 | |
42 | |
40 | #include "connection.h" |
43 | #include "connection.h" |
41 | #include "util.h" |
44 | #include "util.h" |
42 | #include "vpn.h" |
45 | #include "vpn.h" |
43 | |
46 | |
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47 | vpn network; // THE vpn (bad design...) |
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48 | |
44 | ///////////////////////////////////////////////////////////////////////////// |
49 | ///////////////////////////////////////////////////////////////////////////// |
45 | |
50 | |
46 | 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 () |
47 | { |
65 | { |
48 | // the tunnel device mtu should be the physical mtu - overhead |
66 | // the tunnel device mtu should be the physical mtu - overhead |
49 | // the tricky part is rounding to the cipher key blocksize |
67 | // the tricky part is rounding to the cipher key blocksize |
50 | int mtu = conf.mtu - ETH_OVERHEAD - VPE_OVERHEAD - MAX_OVERHEAD; |
68 | int mtu = conf.mtu - ETH_OVERHEAD - VPE_OVERHEAD - MAX_OVERHEAD; |
51 | mtu += ETH_OVERHEAD - 6 - 6; // now we have the data portion |
69 | mtu += ETH_OVERHEAD - 6 - 6; // now we have the data portion |
52 | mtu -= mtu % EVP_CIPHER_block_size (CIPHER); // round |
70 | mtu -= mtu % EVP_CIPHER_block_size (CIPHER); // round |
53 | mtu -= ETH_OVERHEAD - 6 - 6; // and get interface mtu again |
71 | mtu -= ETH_OVERHEAD - 6 - 6; // and get interface mtu again |
54 | |
72 | |
55 | char *env; |
73 | char *env; |
56 | asprintf (&env, "CONFBASE=%s", confbase); |
74 | asprintf (&env, "CONFBASE=%s", confbase); putenv (env); |
57 | putenv (env); |
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58 | asprintf (&env, "NODENAME=%s", THISNODE->nodename); |
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59 | putenv (env); |
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60 | asprintf (&env, "NODEID=%d", THISNODE->id); |
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61 | putenv (env); |
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62 | asprintf (&env, "IFNAME=%s", tap->interface ()); |
75 | asprintf (&env, "IFNAME=%s", tap->interface ()); putenv (env); |
63 | putenv (env); |
76 | asprintf (&env, "IFTYPE=%s", IFTYPE); putenv (env); |
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77 | asprintf (&env, "IFSUBTYPE=%s", IFSUBTYPE); putenv (env); |
64 | asprintf (&env, "MTU=%d", mtu); |
78 | asprintf (&env, "MTU=%d", mtu); putenv (env); |
65 | putenv (env); |
79 | asprintf (&env, "NODES=%d", conns.size ()); putenv (env); |
66 | asprintf (&env, "MAC=%02x:%02x:%02x:%02x:%02x:%02x", |
80 | asprintf (&env, "NODEID=%d", THISNODE->id); putenv (env); |
67 | 0xfe, 0xfd, 0x80, 0x00, THISNODE->id >> 8, |
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68 | THISNODE->id & 0xff); |
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69 | putenv (env); |
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70 | |
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, |
71 | 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; |
72 | } |
110 | } |
73 | |
111 | |
74 | int |
112 | int |
75 | vpn::setup () |
113 | vpn::setup () |
76 | { |
114 | { |
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115 | ipv4_tos = -1; |
77 | ipv4_fd = -1; |
116 | ipv4_fd = -1; |
78 | |
117 | |
79 | if (THISNODE->protocols & PROT_IPv4 && ::conf.ip_proto) |
118 | if (THISNODE->protocols & PROT_IPv4 && ::conf.ip_proto) |
80 | { |
119 | { |
81 | ipv4_fd = socket (PF_INET, SOCK_RAW, ::conf.ip_proto); |
120 | ipv4_fd = socket (PF_INET, SOCK_RAW, ::conf.ip_proto); |
82 | |
121 | |
83 | if (ipv4_fd < 0) |
122 | if (ipv4_fd < 0) |
84 | return -1; |
123 | return -1; |
85 | |
124 | |
86 | 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); |
87 | |
127 | |
88 | #if defined(SOL_IP) && defined(IP_MTU_DISCOVER) |
128 | #if defined(SOL_IP) && defined(IP_MTU_DISCOVER) |
89 | // this I really consider a linux bug. I am neither connected |
129 | // this I really consider a linux bug. I am neither connected |
90 | // 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 |
91 | // fragment for me sometimes. |
131 | // fragment for me sometimes. |
… | |
… | |
98 | sockinfo si (THISNODE, PROT_IPv4); |
138 | sockinfo si (THISNODE, PROT_IPv4); |
99 | |
139 | |
100 | if (bind (ipv4_fd, si.sav4 (), si.salenv4 ())) |
140 | if (bind (ipv4_fd, si.sav4 (), si.salenv4 ())) |
101 | { |
141 | { |
102 | 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)); |
103 | exit (1); |
143 | exit (EXIT_FAILURE); |
104 | } |
144 | } |
105 | |
145 | |
106 | ipv4_ev_watcher.start (ipv4_fd, POLLIN); |
146 | ipv4_ev_watcher.start (ipv4_fd, EV_READ); |
107 | } |
147 | } |
108 | |
148 | |
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149 | udpv4_tos = -1; |
109 | udpv4_fd = -1; |
150 | udpv4_fd = -1; |
110 | |
151 | |
111 | if (THISNODE->protocols & PROT_UDPv4 && THISNODE->udp_port) |
152 | if (THISNODE->protocols & PROT_UDPv4 && THISNODE->udp_port) |
112 | { |
153 | { |
113 | udpv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP); |
154 | udpv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP); |
114 | |
155 | |
115 | if (udpv4_fd < 0) |
156 | if (udpv4_fd < 0) |
116 | return -1; |
157 | return -1; |
117 | |
158 | |
118 | 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); |
119 | |
161 | |
120 | // standard daemon practise... |
162 | // standard daemon practise... |
121 | { |
163 | { |
122 | int oval = 1; |
164 | int oval = 1; |
123 | setsockopt (udpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval); |
165 | setsockopt (udpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval); |
… | |
… | |
136 | sockinfo si (THISNODE, PROT_UDPv4); |
178 | sockinfo si (THISNODE, PROT_UDPv4); |
137 | |
179 | |
138 | if (bind (udpv4_fd, si.sav4 (), si.salenv4 ())) |
180 | if (bind (udpv4_fd, si.sav4 (), si.salenv4 ())) |
139 | { |
181 | { |
140 | 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)); |
141 | exit (1); |
183 | exit (EXIT_FAILURE); |
142 | } |
184 | } |
143 | |
185 | |
144 | udpv4_ev_watcher.start (udpv4_fd, POLLIN); |
186 | udpv4_ev_watcher.start (udpv4_fd, EV_READ); |
145 | } |
187 | } |
146 | |
188 | |
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189 | icmpv4_tos = -1; |
147 | icmpv4_fd = -1; |
190 | icmpv4_fd = -1; |
148 | |
191 | |
149 | #if ENABLE_ICMP |
192 | #if ENABLE_ICMP |
150 | if (THISNODE->protocols & PROT_ICMPv4) |
193 | if (THISNODE->protocols & PROT_ICMPv4) |
151 | { |
194 | { |
152 | icmpv4_fd = socket (PF_INET, SOCK_RAW, IPPROTO_ICMP); |
195 | icmpv4_fd = socket (PF_INET, SOCK_RAW, IPPROTO_ICMP); |
153 | |
196 | |
154 | if (icmpv4_fd < 0) |
197 | if (icmpv4_fd < 0) |
155 | return -1; |
198 | return -1; |
156 | |
199 | |
157 | fcntl (icmpv4_fd, F_SETFL, O_NONBLOCK); |
200 | fcntl (icmpv4_fd, F_SETFL, O_NONBLOCK); |
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201 | fcntl (icmpv4_fd, F_SETFD, FD_CLOEXEC); |
158 | |
202 | |
159 | #ifdef ICMP_FILTER |
203 | #ifdef ICMP_FILTER |
160 | { |
204 | { |
161 | icmp_filter oval; |
205 | icmp_filter oval; |
162 | oval.data = 0xffffffff; |
206 | oval.data = 0xffffffff; |
… | |
… | |
171 | // this I really consider a linux bug. I am neither connected |
215 | // this I really consider a linux bug. I am neither connected |
172 | // 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 |
173 | // fragment for me sometimes. |
217 | // fragment for me sometimes. |
174 | { |
218 | { |
175 | int oval = IP_PMTUDISC_DONT; |
219 | int oval = IP_PMTUDISC_DONT; |
176 | setsockopt (udpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval); |
220 | setsockopt (icmpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval); |
177 | } |
221 | } |
178 | #endif |
222 | #endif |
179 | |
223 | |
180 | sockinfo si (THISNODE, PROT_ICMPv4); |
224 | sockinfo si (THISNODE, PROT_ICMPv4); |
181 | |
225 | |
182 | if (bind (icmpv4_fd, si.sav4 (), si.salenv4 ())) |
226 | if (bind (icmpv4_fd, si.sav4 (), si.salenv4 ())) |
183 | { |
227 | { |
184 | 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)); |
185 | exit (1); |
229 | exit (EXIT_FAILURE); |
186 | } |
230 | } |
187 | |
231 | |
188 | icmpv4_ev_watcher.start (icmpv4_fd, POLLIN); |
232 | icmpv4_ev_watcher.start (icmpv4_fd, EV_READ); |
189 | } |
233 | } |
190 | #endif |
234 | #endif |
191 | |
235 | |
192 | tcpv4_fd = -1; |
236 | tcpv4_fd = -1; |
193 | |
237 | |
… | |
… | |
198 | |
242 | |
199 | if (tcpv4_fd < 0) |
243 | if (tcpv4_fd < 0) |
200 | return -1; |
244 | return -1; |
201 | |
245 | |
202 | 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); |
203 | |
248 | |
204 | // standard daemon practise... |
249 | // standard daemon practise... |
205 | { |
250 | { |
206 | int oval = 1; |
251 | int oval = 1; |
207 | setsockopt (tcpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval); |
252 | setsockopt (tcpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval); |
… | |
… | |
210 | sockinfo si (THISNODE, PROT_TCPv4); |
255 | sockinfo si (THISNODE, PROT_TCPv4); |
211 | |
256 | |
212 | if (bind (tcpv4_fd, si.sav4 (), si.salenv4 ())) |
257 | if (bind (tcpv4_fd, si.sav4 (), si.salenv4 ())) |
213 | { |
258 | { |
214 | 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)); |
215 | exit (1); |
260 | exit (EXIT_FAILURE); |
216 | } |
261 | } |
217 | |
262 | |
218 | if (listen (tcpv4_fd, 5)) |
263 | if (listen (tcpv4_fd, 5)) |
219 | { |
264 | { |
220 | 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)); |
221 | 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); |
222 | } |
296 | } |
223 | |
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224 | tcpv4_ev_watcher.start (tcpv4_fd, POLLIN); |
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225 | } |
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226 | #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 | |
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319 | ///////////////////////////////////////////////////////////////////////////// |
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320 | |
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321 | reconnect_all (); |
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322 | |
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323 | ///////////////////////////////////////////////////////////////////////////// |
227 | |
324 | |
228 | tap = new tap_device (); |
325 | tap = new tap_device (); |
229 | if (!tap) //D this, of course, never catches |
326 | if (!tap) //D this, of course, never catches |
230 | { |
327 | { |
231 | slog (L_ERR, _("cannot create network interface '%s'"), conf.ifname); |
328 | slog (L_ERR, _("cannot create network interface '%s'"), conf.ifname); |
232 | exit (1); |
329 | exit (EXIT_FAILURE); |
233 | } |
330 | } |
234 | |
331 | |
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332 | fcntl (tap->fd, F_SETFD, FD_CLOEXEC); |
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333 | |
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334 | if (tap->if_up () && |
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335 | !run_script (run_script_cb (this, &vpn::script_if_init), true)) |
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336 | { |
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337 | slog (L_ERR, _("interface initialization command '%s' failed, exiting."), |
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338 | tap->if_up ()); |
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339 | exit (EXIT_FAILURE); |
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340 | } |
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341 | |
235 | run_script (run_script_cb (this, &vpn::script_if_up), true); |
342 | if (!run_script (run_script_cb (this, &vpn::script_if_up), true)) |
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343 | { |
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344 | slog (L_ERR, _("if-up command execution failed, exiting.")); |
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345 | exit (EXIT_FAILURE); |
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346 | } |
236 | |
347 | |
237 | tap_ev_watcher.start (tap->fd, POLLIN); |
348 | tap_ev_watcher.start (tap->fd, EV_READ); |
238 | |
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239 | reconnect_all (); |
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240 | |
349 | |
241 | return 0; |
350 | return 0; |
242 | } |
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243 | |
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244 | // send a vpn packet out to other hosts |
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245 | bool |
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246 | vpn::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
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247 | { |
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248 | switch (si.prot) |
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249 | { |
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250 | case PROT_IPv4: |
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251 | return send_ipv4_packet (pkt, si, tos); |
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252 | |
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253 | case PROT_UDPv4: |
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254 | return send_udpv4_packet (pkt, si, tos); |
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255 | |
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256 | #if ENABLE_TCP |
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257 | case PROT_TCPv4: |
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258 | return send_tcpv4_packet (pkt, si, tos); |
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259 | #endif |
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260 | |
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261 | #if ENABLE_ICMP |
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262 | case PROT_ICMPv4: |
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263 | return send_icmpv4_packet (pkt, si, tos); |
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264 | #endif |
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265 | |
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266 | default: |
|
|
267 | slog (L_CRIT, _("%s: FATAL: trying to send packet with unsupported protocol"), (const char *)si); |
|
|
268 | return false; |
|
|
269 | } |
|
|
270 | } |
351 | } |
271 | |
352 | |
272 | bool |
353 | bool |
273 | vpn::send_ipv4_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
354 | vpn::send_ipv4_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
274 | { |
355 | { |
275 | #if defined(SOL_IP) && defined(IP_TOS) |
356 | set_tos (ipv4_fd, ipv4_tos, tos); |
276 | setsockopt (ipv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos); |
|
|
277 | #endif |
|
|
278 | sendto (ipv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ()); |
357 | sendto (ipv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ()); |
279 | |
358 | |
280 | return true; |
359 | return true; |
281 | } |
360 | } |
282 | |
361 | |
… | |
… | |
305 | |
384 | |
306 | #if ENABLE_ICMP |
385 | #if ENABLE_ICMP |
307 | bool |
386 | bool |
308 | vpn::send_icmpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
387 | vpn::send_icmpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
309 | { |
388 | { |
310 | #if defined(SOL_IP) && defined(IP_TOS) |
|
|
311 | setsockopt (icmpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos); |
|
|
312 | #endif |
|
|
313 | |
|
|
314 | pkt->unshift_hdr (4); |
389 | pkt->unshift_hdr (4); |
315 | |
390 | |
316 | icmp_header *hdr = (icmp_header *)&((*pkt)[0]); |
391 | icmp_header *hdr = (icmp_header *)&((*pkt)[0]); |
317 | hdr->type = ::conf.icmp_type; |
392 | hdr->type = ::conf.icmp_type; |
318 | hdr->code = 255; |
393 | hdr->code = 255; |
319 | hdr->checksum = 0; |
394 | hdr->checksum = 0; |
320 | hdr->checksum = ipv4_checksum ((u16 *)hdr, pkt->len); |
395 | hdr->checksum = ipv4_checksum ((u16 *)hdr, pkt->len); |
321 | |
396 | |
|
|
397 | set_tos (icmpv4_fd, icmpv4_tos, tos); |
322 | sendto (icmpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ()); |
398 | sendto (icmpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ()); |
323 | |
399 | |
324 | return true; |
400 | return true; |
325 | } |
401 | } |
326 | #endif |
402 | #endif |
327 | |
403 | |
328 | bool |
404 | bool |
329 | vpn::send_udpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
405 | vpn::send_udpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
330 | { |
406 | { |
331 | #if defined(SOL_IP) && defined(IP_TOS) |
407 | set_tos (udpv4_fd, udpv4_tos, tos); |
332 | setsockopt (udpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos); |
|
|
333 | #endif |
|
|
334 | sendto (udpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ()); |
408 | sendto (udpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ()); |
335 | |
409 | |
336 | return true; |
410 | return true; |
|
|
411 | } |
|
|
412 | |
|
|
413 | void |
|
|
414 | vpn::inject_data_packet (tap_packet *pkt, int dst) |
|
|
415 | { |
|
|
416 | if (dst) |
|
|
417 | { |
|
|
418 | // unicast |
|
|
419 | if (dst != THISNODE->id) |
|
|
420 | conns[dst - 1]->inject_data_packet (pkt); |
|
|
421 | } |
|
|
422 | else |
|
|
423 | { |
|
|
424 | // broadcast, this is ugly, but due to the security policy |
|
|
425 | // we have to connect to all hosts... |
|
|
426 | for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c) |
|
|
427 | if ((*c)->conf != THISNODE) |
|
|
428 | (*c)->inject_data_packet (pkt, true); |
|
|
429 | } |
337 | } |
430 | } |
338 | |
431 | |
339 | void |
432 | void |
340 | vpn::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi) |
433 | vpn::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi) |
341 | { |
434 | { |
… | |
… | |
358 | connection *c = conns[src - 1]; |
451 | connection *c = conns[src - 1]; |
359 | |
452 | |
360 | if (dst == 0) |
453 | if (dst == 0) |
361 | slog (L_WARN, _("%s(%s): received broadcast (protocol violation)"), |
454 | slog (L_WARN, _("%s(%s): received broadcast (protocol violation)"), |
362 | c->conf->nodename, (const char *)rsi); |
455 | c->conf->nodename, (const char *)rsi); |
363 | else if (dst != 0 && dst != THISNODE->id) |
456 | else if (dst != THISNODE->id) |
364 | { |
457 | { |
365 | if (THISNODE->routerprio) |
458 | if (THISNODE->routerprio) |
366 | // the tos setting gets lost here. who cares. |
459 | // the tos setting gets lost here. who cares. |
367 | conns[dst - 1]->inject_vpn_packet (pkt); |
460 | conns[dst - 1]->inject_vpn_packet (pkt); |
368 | else |
461 | else |
… | |
… | |
374 | else |
467 | else |
375 | c->recv_vpn_packet (pkt, rsi); |
468 | c->recv_vpn_packet (pkt, rsi); |
376 | } |
469 | } |
377 | } |
470 | } |
378 | |
471 | |
|
|
472 | bool |
|
|
473 | vpn::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
|
|
474 | { |
|
|
475 | switch (si.prot) |
|
|
476 | { |
|
|
477 | case PROT_IPv4: |
|
|
478 | return send_ipv4_packet (pkt, si, tos); |
|
|
479 | |
|
|
480 | case PROT_UDPv4: |
|
|
481 | return send_udpv4_packet (pkt, si, tos); |
|
|
482 | |
|
|
483 | #if ENABLE_TCP |
|
|
484 | case PROT_TCPv4: |
|
|
485 | return send_tcpv4_packet (pkt, si, tos); |
|
|
486 | #endif |
|
|
487 | #if ENABLE_ICMP |
|
|
488 | case PROT_ICMPv4: |
|
|
489 | return send_icmpv4_packet (pkt, si, tos); |
|
|
490 | #endif |
|
|
491 | #if ENABLE_DNS |
|
|
492 | case PROT_DNSv4: |
|
|
493 | return send_dnsv4_packet (pkt, si, tos); |
|
|
494 | #endif |
|
|
495 | default: |
|
|
496 | slog (L_CRIT, _("%s: FATAL: trying to send packet with unsupported protocol"), (const char *)si); |
|
|
497 | } |
|
|
498 | |
|
|
499 | return false; |
|
|
500 | } |
|
|
501 | |
379 | void |
502 | void |
380 | vpn::ipv4_ev (io_watcher &w, short revents) |
503 | vpn::ipv4_ev (ev::io &w, int revents) |
381 | { |
504 | { |
382 | if (revents & (POLLIN | POLLERR)) |
505 | if (revents & EV_READ) |
383 | { |
506 | { |
384 | vpn_packet *pkt = new vpn_packet; |
507 | vpn_packet *pkt = new vpn_packet; |
385 | struct sockaddr_in sa; |
508 | struct sockaddr_in sa; |
386 | socklen_t sa_len = sizeof (sa); |
509 | socklen_t sa_len = sizeof (sa); |
387 | int len; |
510 | int len; |
… | |
… | |
392 | |
515 | |
393 | if (len > 0) |
516 | if (len > 0) |
394 | { |
517 | { |
395 | pkt->len = len; |
518 | pkt->len = len; |
396 | |
519 | |
397 | // raw sockets deliver the ipv4, but don't expect it on sends |
520 | // raw sockets deliver the ipv4 header, but don't expect it on sends |
398 | // this is slow, but... |
|
|
399 | pkt->skip_hdr (IP_OVERHEAD); |
521 | pkt->skip_hdr (IP_OVERHEAD); |
400 | |
522 | |
401 | recv_vpn_packet (pkt, si); |
523 | recv_vpn_packet (pkt, si); |
402 | } |
524 | } |
403 | else |
525 | else |
… | |
… | |
406 | slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno)); |
528 | slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno)); |
407 | } |
529 | } |
408 | |
530 | |
409 | delete pkt; |
531 | delete pkt; |
410 | } |
532 | } |
411 | else if (revents & POLLHUP) |
|
|
412 | { |
|
|
413 | // this cannot ;) happen on udp sockets |
|
|
414 | slog (L_ERR, _("FATAL: POLLHUP on ipv4 fd, terminating.")); |
|
|
415 | exit (1); |
|
|
416 | } |
|
|
417 | else |
533 | else |
418 | { |
534 | { |
419 | slog (L_ERR, |
535 | slog (L_ERR, |
420 | _("FATAL: unknown revents %08x in socket, terminating\n"), |
536 | _("FATAL: unknown revents %08x in socket, terminating\n"), |
421 | revents); |
537 | revents); |
422 | exit (1); |
538 | exit (EXIT_FAILURE); |
423 | } |
539 | } |
424 | } |
540 | } |
425 | |
541 | |
426 | #if ENABLE_ICMP |
542 | #if ENABLE_ICMP |
427 | void |
543 | void |
428 | vpn::icmpv4_ev (io_watcher &w, short revents) |
544 | vpn::icmpv4_ev (ev::io &w, int revents) |
429 | { |
545 | { |
430 | if (revents & (POLLIN | POLLERR)) |
546 | if (revents & EV_READ) |
431 | { |
547 | { |
432 | vpn_packet *pkt = new vpn_packet; |
548 | vpn_packet *pkt = new vpn_packet; |
433 | struct sockaddr_in sa; |
549 | struct sockaddr_in sa; |
434 | socklen_t sa_len = sizeof (sa); |
550 | socklen_t sa_len = sizeof (sa); |
435 | int len; |
551 | int len; |
… | |
… | |
460 | slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno)); |
576 | slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno)); |
461 | } |
577 | } |
462 | |
578 | |
463 | delete pkt; |
579 | delete pkt; |
464 | } |
580 | } |
465 | else if (revents & POLLHUP) |
|
|
466 | { |
|
|
467 | // this cannot ;) happen on udp sockets |
|
|
468 | slog (L_ERR, _("FATAL: POLLHUP on icmpv4 fd, terminating.")); |
|
|
469 | exit (1); |
|
|
470 | } |
|
|
471 | else |
581 | else |
472 | { |
582 | { |
473 | slog (L_ERR, |
583 | slog (L_ERR, |
474 | _("FATAL: unknown revents %08x in socket, terminating\n"), |
584 | _("FATAL: unknown revents %08x in socket, terminating\n"), |
475 | revents); |
585 | revents); |
476 | exit (1); |
586 | exit (EXIT_FAILURE); |
477 | } |
587 | } |
478 | } |
588 | } |
479 | #endif |
589 | #endif |
480 | |
590 | |
481 | void |
591 | void |
482 | vpn::udpv4_ev (io_watcher &w, short revents) |
592 | vpn::udpv4_ev (ev::io &w, int revents) |
483 | { |
593 | { |
484 | if (revents & (POLLIN | POLLERR)) |
594 | if (revents & EV_READ) |
485 | { |
595 | { |
486 | vpn_packet *pkt = new vpn_packet; |
596 | vpn_packet *pkt = new vpn_packet; |
487 | struct sockaddr_in sa; |
597 | struct sockaddr_in sa; |
488 | socklen_t sa_len = sizeof (sa); |
598 | socklen_t sa_len = sizeof (sa); |
489 | int len; |
599 | int len; |
… | |
… | |
504 | slog (L_DEBUG, _("%s: fd %d, %s"), (const char *)si, w.fd, strerror (errno)); |
614 | slog (L_DEBUG, _("%s: fd %d, %s"), (const char *)si, w.fd, strerror (errno)); |
505 | } |
615 | } |
506 | |
616 | |
507 | delete pkt; |
617 | delete pkt; |
508 | } |
618 | } |
509 | else if (revents & POLLHUP) |
|
|
510 | { |
|
|
511 | // this cannot ;) happen on udp sockets |
|
|
512 | slog (L_ERR, _("FATAL: POLLHUP on udp v4 fd, terminating.")); |
|
|
513 | exit (1); |
|
|
514 | } |
|
|
515 | else |
619 | else |
516 | { |
620 | { |
517 | slog (L_ERR, |
621 | slog (L_ERR, |
518 | _("FATAL: unknown revents %08x in socket, terminating\n"), |
622 | _("FATAL: unknown revents %08x in socket, terminating\n"), |
519 | revents); |
623 | revents); |
520 | exit (1); |
624 | exit (EXIT_FAILURE); |
521 | } |
625 | } |
522 | } |
626 | } |
523 | |
627 | |
524 | void |
628 | void |
525 | vpn::tap_ev (io_watcher &w, short revents) |
629 | vpn::tap_ev (ev::io &w, int revents) |
526 | { |
630 | { |
527 | if (revents & POLLIN) |
631 | if (revents & EV_READ) |
528 | { |
632 | { |
529 | /* process data */ |
633 | /* process data */ |
530 | tap_packet *pkt; |
634 | tap_packet *pkt; |
531 | |
635 | |
532 | pkt = tap->recv (); |
636 | pkt = tap->recv (); |
… | |
… | |
539 | int dst = mac2id (pkt->dst); |
643 | int dst = mac2id (pkt->dst); |
540 | int src = mac2id (pkt->src); |
644 | int src = mac2id (pkt->src); |
541 | |
645 | |
542 | if (src != THISNODE->id) |
646 | if (src != THISNODE->id) |
543 | { |
647 | { |
544 | slog (L_ERR, _("FATAL: tap packet not originating on current node received, exiting.")); |
648 | slog (L_ERR, _("FATAL: tap packet not originating on current node received (if-up script not working properly?), exiting.")); |
545 | exit (1); |
649 | exit (EXIT_FAILURE); |
546 | } |
650 | } |
547 | |
651 | |
548 | if (dst == THISNODE->id) |
652 | if (dst == THISNODE->id) |
549 | { |
653 | { |
550 | slog (L_ERR, _("FATAL: tap packet destined for current node received, exiting.")); |
654 | slog (L_ERR, _("FATAL: tap packet destined for current node received, exiting.")); |
551 | exit (1); |
655 | exit (EXIT_FAILURE); |
552 | } |
656 | } |
553 | |
657 | |
554 | if (dst > conns.size ()) |
658 | if (dst > conns.size ()) |
555 | slog (L_ERR, _("tap packet for unknown node %d received, ignoring."), dst); |
659 | slog (L_ERR, _("tap packet for unknown node %d received, ignoring."), dst); |
556 | else |
660 | else |
557 | { |
|
|
558 | if (dst) |
|
|
559 | { |
|
|
560 | // unicast |
|
|
561 | if (dst != THISNODE->id) |
|
|
562 | conns[dst - 1]->inject_data_packet (pkt); |
|
|
563 | } |
|
|
564 | else |
|
|
565 | { |
|
|
566 | // broadcast, this is ugly, but due to the security policy |
|
|
567 | // we have to connect to all hosts... |
|
|
568 | for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c) |
|
|
569 | if ((*c)->conf != THISNODE) |
|
|
570 | (*c)->inject_data_packet (pkt); |
661 | inject_data_packet (pkt, dst); |
571 | } |
|
|
572 | } |
|
|
573 | } |
662 | } |
574 | |
663 | |
575 | delete pkt; |
664 | delete pkt; |
576 | } |
|
|
577 | else if (revents & (POLLHUP | POLLERR)) |
|
|
578 | { |
|
|
579 | slog (L_ERR, _("FATAL: POLLHUP or POLLERR on network device fd, terminating.")); |
|
|
580 | exit (1); |
|
|
581 | } |
665 | } |
582 | else |
666 | else |
583 | abort (); |
667 | abort (); |
584 | } |
668 | } |
585 | |
669 | |
586 | void |
670 | void |
587 | vpn::event_cb (time_watcher &w) |
671 | vpn::event_cb (ev::timer &w, int) |
588 | { |
672 | { |
589 | if (events) |
673 | if (events) |
590 | { |
674 | { |
591 | if (events & EVENT_SHUTDOWN) |
675 | if (events & EVENT_SHUTDOWN) |
592 | { |
676 | { |
593 | slog (L_INFO, _("preparing shutdown...")); |
677 | slog (L_INFO, _("preparing shutdown...")); |
594 | |
678 | |
595 | shutdown_all (); |
679 | shutdown_all (); |
596 | |
|
|
597 | remove_pid (pidfilename); |
680 | remove_pid (conf.pidfilename); |
598 | |
|
|
599 | slog (L_INFO, _("terminating")); |
681 | slog (L_INFO, _("terminating")); |
600 | |
682 | exit (EXIT_SUCCESS); |
601 | exit (0); |
|
|
602 | } |
683 | } |
603 | |
684 | |
604 | if (events & EVENT_RECONNECT) |
685 | if (events & EVENT_RECONNECT) |
605 | { |
686 | { |
606 | slog (L_INFO, _("forced reconnect")); |
687 | slog (L_INFO, _("forced reconnect")); |
… | |
… | |
608 | reconnect_all (); |
689 | reconnect_all (); |
609 | } |
690 | } |
610 | |
691 | |
611 | events = 0; |
692 | events = 0; |
612 | } |
693 | } |
613 | |
|
|
614 | w.at = TSTAMP_CANCEL; |
|
|
615 | } |
694 | } |
616 | |
695 | |
617 | void |
696 | void |
618 | vpn::shutdown_all () |
697 | vpn::shutdown_all () |
619 | { |
698 | { |
… | |
… | |
632 | connection_init (); |
711 | connection_init (); |
633 | |
712 | |
634 | for (configuration::node_vector::iterator i = conf.nodes.begin (); |
713 | for (configuration::node_vector::iterator i = conf.nodes.begin (); |
635 | i != conf.nodes.end (); ++i) |
714 | i != conf.nodes.end (); ++i) |
636 | { |
715 | { |
637 | connection *conn = new connection (this); |
716 | connection *conn = new connection (this, *i); |
638 | |
|
|
639 | conn->conf = *i; |
|
|
640 | conns.push_back (conn); |
717 | conns.push_back (conn); |
641 | |
|
|
642 | conn->establish_connection (); |
718 | conn->establish_connection (); |
643 | } |
719 | } |
644 | } |
720 | } |
645 | |
721 | |
646 | connection *vpn::find_router () |
722 | connection *vpn::find_router () |
… | |
… | |
691 | } |
767 | } |
692 | |
768 | |
693 | void |
769 | void |
694 | vpn::dump_status () |
770 | vpn::dump_status () |
695 | { |
771 | { |
696 | slog (L_NOTICE, _("BEGIN status dump (%ld)"), (long)NOW); |
772 | slog (L_NOTICE, _("BEGIN status dump (%ld)"), (long)ev_now ()); |
697 | |
773 | |
698 | for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c) |
774 | for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c) |
699 | (*c)->dump_status (); |
775 | (*c)->dump_status (); |
700 | |
776 | |
701 | slog (L_NOTICE, _("END status dump")); |
777 | slog (L_NOTICE, _("END status dump")); |
… | |
… | |
709 | , tcpv4_ev_watcher (this, &vpn::tcpv4_ev) |
785 | , tcpv4_ev_watcher (this, &vpn::tcpv4_ev) |
710 | #endif |
786 | #endif |
711 | #if ENABLE_ICMP |
787 | #if ENABLE_ICMP |
712 | , icmpv4_ev_watcher(this, &vpn::icmpv4_ev) |
788 | , icmpv4_ev_watcher(this, &vpn::icmpv4_ev) |
713 | #endif |
789 | #endif |
|
|
790 | #if ENABLE_DNS |
|
|
791 | , dnsv4_ev_watcher (this, &vpn::dnsv4_ev) |
|
|
792 | #endif |
714 | , tap_ev_watcher (this, &vpn::tap_ev) |
793 | , tap_ev_watcher (this, &vpn::tap_ev) |
715 | { |
794 | { |
716 | } |
795 | } |
717 | |
796 | |
718 | vpn::~vpn () |
797 | vpn::~vpn () |