1 | /* |
1 | /* |
2 | vpn.C -- handle the protocol, encryption, handshaking etc. |
2 | vpn.C -- handle the protocol, encryption, handshaking etc. |
3 | Copyright (C) 2003-2004 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> |
|
|
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> |
… | |
… | |
44 | |
46 | |
45 | vpn network; // THE vpn (bad design...) |
47 | vpn network; // THE vpn (bad design...) |
46 | |
48 | |
47 | ///////////////////////////////////////////////////////////////////////////// |
49 | ///////////////////////////////////////////////////////////////////////////// |
48 | |
50 | |
49 | const char *vpn::script_if_up () |
51 | static void inline |
|
|
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 | |
|
|
58 | tos_prev = tos; |
|
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59 | setsockopt (fd, SOL_IP, IP_TOS, &tos, sizeof tos); |
|
|
60 | #endif |
|
|
61 | } |
|
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62 | |
|
|
63 | void |
|
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64 | vpn::script_init_env () |
50 | { |
65 | { |
51 | // the tunnel device mtu should be the physical mtu - overhead |
66 | // the tunnel device mtu should be the physical mtu - overhead |
52 | // the tricky part is rounding to the cipher key blocksize |
67 | // the tricky part is rounding to the cipher key blocksize |
53 | int mtu = conf.mtu - ETH_OVERHEAD - VPE_OVERHEAD - MAX_OVERHEAD; |
68 | int mtu = conf.mtu - ETH_OVERHEAD - VPE_OVERHEAD - MAX_OVERHEAD; |
54 | mtu += ETH_OVERHEAD - 6 - 6; // now we have the data portion |
69 | mtu += ETH_OVERHEAD - 6 - 6; // now we have the data portion |
55 | mtu -= mtu % EVP_CIPHER_block_size (CIPHER); // round |
70 | mtu -= mtu % EVP_CIPHER_block_size (CIPHER); // round |
56 | mtu -= ETH_OVERHEAD - 6 - 6; // and get interface mtu again |
71 | mtu -= ETH_OVERHEAD - 6 - 6; // and get interface mtu again |
57 | |
72 | |
58 | char *env; |
73 | char *env; |
59 | asprintf (&env, "CONFBASE=%s", confbase); putenv (env); |
74 | asprintf (&env, "CONFBASE=%s", confbase); putenv (env); |
60 | asprintf (&env, "NODENAME=%s", THISNODE->nodename); putenv (env); |
|
|
61 | asprintf (&env, "NODEID=%d", THISNODE->id); putenv (env); |
|
|
62 | asprintf (&env, "IFNAME=%s", tap->interface ()); putenv (env); |
75 | asprintf (&env, "IFNAME=%s", tap->interface ()); putenv (env); |
63 | asprintf (&env, "IFTYPE=%s", IFTYPE); putenv (env); |
76 | asprintf (&env, "IFTYPE=%s", IFTYPE); putenv (env); |
64 | asprintf (&env, "IFSUBTYPE=%s", IFSUBTYPE); putenv (env); |
77 | asprintf (&env, "IFSUBTYPE=%s", IFSUBTYPE); putenv (env); |
65 | asprintf (&env, "MTU=%d", mtu); putenv (env); |
78 | asprintf (&env, "MTU=%d", mtu); putenv (env); |
66 | asprintf (&env, "MAC=%02x:%02x:%02x:%02x:%02x:%02x", |
79 | asprintf (&env, "NODES=%d", conns.size ()); putenv (env); |
67 | 0xfe, 0xfd, 0x80, 0x00, THISNODE->id >> 8, |
80 | asprintf (&env, "NODEID=%d", THISNODE->id); putenv (env); |
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 | { |
|
|
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); |
|
|
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, EVENT_READ); |
146 | ipv4_ev_watcher.start (ipv4_fd, EV_READ); |
107 | } |
147 | } |
108 | |
148 | |
|
|
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); |
|
|
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, EVENT_READ); |
186 | udpv4_ev_watcher.start (udpv4_fd, EV_READ); |
145 | } |
187 | } |
146 | |
188 | |
|
|
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); |
|
|
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, EVENT_READ); |
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); |
|
|
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); |
222 | } |
267 | } |
223 | |
268 | |
224 | tcpv4_ev_watcher.start (tcpv4_fd, EVENT_READ); |
269 | tcpv4_ev_watcher.start (tcpv4_fd, EV_READ); |
|
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270 | } |
|
|
271 | #endif |
|
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272 | |
|
|
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 | |
|
|
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 |
|
|
291 | // nor do I fragment myself. Linux still sets DF and doesn't |
|
|
292 | // fragment for me sometimes. |
|
|
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); |
225 | } |
296 | } |
226 | #endif |
297 | # endif |
|
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298 | |
|
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299 | // standard daemon practise... |
|
|
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 | |
|
|
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 | ///////////////////////////////////////////////////////////////////////////// |
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 | |
235 | run_script (run_script_cb (this, &vpn::script_if_up), true); |
332 | fcntl (tap->fd, F_SETFD, FD_CLOEXEC); |
236 | |
333 | |
|
|
334 | run_script_cb cb; |
|
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335 | |
|
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336 | callback_set (cb, this, vpn, script_if_init); |
|
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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 | callback_set (cb, this, vpn, script_if_up); |
|
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346 | if (!run_script (cb, true)) |
|
|
347 | { |
|
|
348 | slog (L_ERR, _("if-up command execution failed, exiting.")); |
|
|
349 | exit (EXIT_FAILURE); |
|
|
350 | } |
|
|
351 | |
237 | tap_ev_watcher.start (tap->fd, EVENT_READ); |
352 | tap_ev_watcher.start (tap->fd, EV_READ); |
238 | |
|
|
239 | reconnect_all (); |
|
|
240 | |
353 | |
241 | return 0; |
354 | return 0; |
242 | } |
|
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243 | |
|
|
244 | // send a vpn packet out to other hosts |
|
|
245 | bool |
|
|
246 | vpn::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
|
|
247 | { |
|
|
248 | switch (si.prot) |
|
|
249 | { |
|
|
250 | case PROT_IPv4: |
|
|
251 | return send_ipv4_packet (pkt, si, tos); |
|
|
252 | |
|
|
253 | case PROT_UDPv4: |
|
|
254 | return send_udpv4_packet (pkt, si, tos); |
|
|
255 | |
|
|
256 | #if ENABLE_TCP |
|
|
257 | case PROT_TCPv4: |
|
|
258 | return send_tcpv4_packet (pkt, si, tos); |
|
|
259 | #endif |
|
|
260 | |
|
|
261 | #if ENABLE_ICMP |
|
|
262 | case PROT_ICMPv4: |
|
|
263 | return send_icmpv4_packet (pkt, si, tos); |
|
|
264 | #endif |
|
|
265 | |
|
|
266 | default: |
|
|
267 | slog (L_CRIT, _("%s: FATAL: trying to send packet with unsupported protocol"), (const char *)si); |
|
|
268 | return false; |
|
|
269 | } |
|
|
270 | } |
355 | } |
271 | |
356 | |
272 | bool |
357 | bool |
273 | 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) |
274 | { |
359 | { |
275 | #if defined(SOL_IP) && defined(IP_TOS) |
360 | 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 ()); |
361 | sendto (ipv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ()); |
279 | |
362 | |
280 | return true; |
363 | return true; |
281 | } |
364 | } |
282 | |
365 | |
… | |
… | |
305 | |
388 | |
306 | #if ENABLE_ICMP |
389 | #if ENABLE_ICMP |
307 | bool |
390 | bool |
308 | 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) |
309 | { |
392 | { |
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); |
393 | pkt->unshift_hdr (4); |
315 | |
394 | |
316 | icmp_header *hdr = (icmp_header *)&((*pkt)[0]); |
395 | icmp_header *hdr = (icmp_header *)&((*pkt)[0]); |
317 | hdr->type = ::conf.icmp_type; |
396 | hdr->type = ::conf.icmp_type; |
318 | hdr->code = 255; |
397 | hdr->code = 255; |
319 | hdr->checksum = 0; |
398 | hdr->checksum = 0; |
320 | hdr->checksum = ipv4_checksum ((u16 *)hdr, pkt->len); |
399 | hdr->checksum = ipv4_checksum ((u16 *)hdr, pkt->len); |
321 | |
400 | |
|
|
401 | set_tos (icmpv4_fd, icmpv4_tos, tos); |
322 | 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 ()); |
323 | |
403 | |
324 | return true; |
404 | return true; |
325 | } |
405 | } |
326 | #endif |
406 | #endif |
327 | |
407 | |
328 | bool |
408 | bool |
329 | 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) |
330 | { |
410 | { |
331 | #if defined(SOL_IP) && defined(IP_TOS) |
411 | 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 ()); |
412 | sendto (udpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ()); |
335 | |
413 | |
336 | return true; |
414 | return true; |
337 | } |
415 | } |
338 | |
416 | |
… | |
… | |
393 | else |
471 | else |
394 | c->recv_vpn_packet (pkt, rsi); |
472 | c->recv_vpn_packet (pkt, rsi); |
395 | } |
473 | } |
396 | } |
474 | } |
397 | |
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 | |
398 | void |
506 | void |
399 | vpn::ipv4_ev (io_watcher &w, short revents) |
507 | vpn::ipv4_ev (ev::io &w, int revents) |
400 | { |
508 | { |
401 | if (revents & EVENT_READ) |
509 | if (revents & EV_READ) |
402 | { |
510 | { |
403 | vpn_packet *pkt = new vpn_packet; |
511 | vpn_packet *pkt = new vpn_packet; |
404 | struct sockaddr_in sa; |
512 | struct sockaddr_in sa; |
405 | socklen_t sa_len = sizeof (sa); |
513 | socklen_t sa_len = sizeof (sa); |
406 | int len; |
514 | int len; |
… | |
… | |
411 | |
519 | |
412 | if (len > 0) |
520 | if (len > 0) |
413 | { |
521 | { |
414 | pkt->len = len; |
522 | pkt->len = len; |
415 | |
523 | |
416 | // 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 |
417 | // this is slow, but... |
|
|
418 | pkt->skip_hdr (IP_OVERHEAD); |
525 | pkt->skip_hdr (IP_OVERHEAD); |
419 | |
526 | |
420 | recv_vpn_packet (pkt, si); |
527 | recv_vpn_packet (pkt, si); |
421 | } |
528 | } |
422 | else |
529 | else |
… | |
… | |
428 | delete pkt; |
535 | delete pkt; |
429 | } |
536 | } |
430 | else |
537 | else |
431 | { |
538 | { |
432 | slog (L_ERR, |
539 | slog (L_ERR, |
433 | _("FATAL: unknown revents %08x in socket, terminating\n"), |
540 | _("FATAL: unknown revents %08x in socket, terminating\n"), |
434 | revents); |
541 | revents); |
435 | exit (1); |
542 | exit (EXIT_FAILURE); |
436 | } |
543 | } |
437 | } |
544 | } |
438 | |
545 | |
439 | #if ENABLE_ICMP |
546 | #if ENABLE_ICMP |
440 | void |
547 | void |
441 | vpn::icmpv4_ev (io_watcher &w, short revents) |
548 | vpn::icmpv4_ev (ev::io &w, int revents) |
442 | { |
549 | { |
443 | if (revents & EVENT_READ) |
550 | if (revents & EV_READ) |
444 | { |
551 | { |
445 | vpn_packet *pkt = new vpn_packet; |
552 | vpn_packet *pkt = new vpn_packet; |
446 | struct sockaddr_in sa; |
553 | struct sockaddr_in sa; |
447 | socklen_t sa_len = sizeof (sa); |
554 | socklen_t sa_len = sizeof (sa); |
448 | int len; |
555 | int len; |
… | |
… | |
478 | else |
585 | else |
479 | { |
586 | { |
480 | slog (L_ERR, |
587 | slog (L_ERR, |
481 | _("FATAL: unknown revents %08x in socket, terminating\n"), |
588 | _("FATAL: unknown revents %08x in socket, terminating\n"), |
482 | revents); |
589 | revents); |
483 | exit (1); |
590 | exit (EXIT_FAILURE); |
484 | } |
591 | } |
485 | } |
592 | } |
486 | #endif |
593 | #endif |
487 | |
594 | |
488 | void |
595 | void |
489 | vpn::udpv4_ev (io_watcher &w, short revents) |
596 | vpn::udpv4_ev (ev::io &w, int revents) |
490 | { |
597 | { |
491 | if (revents & EVENT_READ) |
598 | if (revents & EV_READ) |
492 | { |
599 | { |
493 | vpn_packet *pkt = new vpn_packet; |
600 | vpn_packet *pkt = new vpn_packet; |
494 | struct sockaddr_in sa; |
601 | struct sockaddr_in sa; |
495 | socklen_t sa_len = sizeof (sa); |
602 | socklen_t sa_len = sizeof (sa); |
496 | int len; |
603 | int len; |
… | |
… | |
516 | else |
623 | else |
517 | { |
624 | { |
518 | slog (L_ERR, |
625 | slog (L_ERR, |
519 | _("FATAL: unknown revents %08x in socket, terminating\n"), |
626 | _("FATAL: unknown revents %08x in socket, terminating\n"), |
520 | revents); |
627 | revents); |
521 | exit (1); |
628 | exit (EXIT_FAILURE); |
522 | } |
629 | } |
523 | } |
630 | } |
524 | |
631 | |
525 | void |
632 | void |
526 | vpn::tap_ev (io_watcher &w, short revents) |
633 | vpn::tap_ev (ev::io &w, int revents) |
527 | { |
634 | { |
528 | if (revents & EVENT_READ) |
635 | if (revents & EV_READ) |
529 | { |
636 | { |
530 | /* process data */ |
637 | /* process data */ |
531 | tap_packet *pkt; |
638 | tap_packet *pkt; |
532 | |
639 | |
533 | pkt = tap->recv (); |
640 | pkt = tap->recv (); |
… | |
… | |
540 | int dst = mac2id (pkt->dst); |
647 | int dst = mac2id (pkt->dst); |
541 | int src = mac2id (pkt->src); |
648 | int src = mac2id (pkt->src); |
542 | |
649 | |
543 | if (src != THISNODE->id) |
650 | if (src != THISNODE->id) |
544 | { |
651 | { |
545 | 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.")); |
546 | exit (1); |
653 | exit (EXIT_FAILURE); |
547 | } |
654 | } |
548 | |
655 | |
549 | if (dst == THISNODE->id) |
656 | if (dst == THISNODE->id) |
550 | { |
657 | { |
551 | 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.")); |
552 | exit (1); |
659 | exit (EXIT_FAILURE); |
553 | } |
660 | } |
554 | |
661 | |
555 | if (dst > conns.size ()) |
662 | if (dst > conns.size ()) |
556 | 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); |
557 | else |
664 | else |
… | |
… | |
563 | else |
670 | else |
564 | abort (); |
671 | abort (); |
565 | } |
672 | } |
566 | |
673 | |
567 | void |
674 | void |
568 | vpn::event_cb (time_watcher &w) |
675 | vpn::event_cb (ev::timer &w, int) |
569 | { |
676 | { |
570 | if (events) |
677 | if (events) |
571 | { |
678 | { |
572 | if (events & EVENT_SHUTDOWN) |
679 | if (events & EVENT_SHUTDOWN) |
573 | { |
680 | { |
574 | slog (L_INFO, _("preparing shutdown...")); |
681 | slog (L_INFO, _("preparing shutdown...")); |
575 | |
682 | |
576 | shutdown_all (); |
683 | shutdown_all (); |
577 | remove_pid (pidfilename); |
684 | remove_pid (conf.pidfilename); |
578 | slog (L_INFO, _("terminating")); |
685 | slog (L_INFO, _("terminating")); |
579 | exit (0); |
686 | exit (EXIT_SUCCESS); |
580 | } |
687 | } |
581 | |
688 | |
582 | if (events & EVENT_RECONNECT) |
689 | if (events & EVENT_RECONNECT) |
583 | { |
690 | { |
584 | slog (L_INFO, _("forced reconnect")); |
691 | slog (L_INFO, _("forced reconnect")); |
… | |
… | |
608 | connection_init (); |
715 | connection_init (); |
609 | |
716 | |
610 | for (configuration::node_vector::iterator i = conf.nodes.begin (); |
717 | for (configuration::node_vector::iterator i = conf.nodes.begin (); |
611 | i != conf.nodes.end (); ++i) |
718 | i != conf.nodes.end (); ++i) |
612 | { |
719 | { |
613 | connection *conn = new connection (this); |
720 | connection *conn = new connection (this, *i); |
614 | |
|
|
615 | conn->conf = *i; |
|
|
616 | conns.push_back (conn); |
721 | conns.push_back (conn); |
617 | |
|
|
618 | conn->establish_connection (); |
722 | conn->establish_connection (); |
619 | } |
723 | } |
620 | } |
724 | } |
621 | |
725 | |
622 | connection *vpn::find_router () |
726 | connection *vpn::find_router () |
… | |
… | |
667 | } |
771 | } |
668 | |
772 | |
669 | void |
773 | void |
670 | vpn::dump_status () |
774 | vpn::dump_status () |
671 | { |
775 | { |
672 | slog (L_NOTICE, _("BEGIN status dump (%ld)"), (long)NOW); |
776 | slog (L_NOTICE, _("BEGIN status dump (%ld)"), (long)ev_now ()); |
673 | |
777 | |
674 | for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c) |
778 | for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c) |
675 | (*c)->dump_status (); |
779 | (*c)->dump_status (); |
676 | |
780 | |
677 | slog (L_NOTICE, _("END status dump")); |
781 | slog (L_NOTICE, _("END status dump")); |
… | |
… | |
685 | , tcpv4_ev_watcher (this, &vpn::tcpv4_ev) |
789 | , tcpv4_ev_watcher (this, &vpn::tcpv4_ev) |
686 | #endif |
790 | #endif |
687 | #if ENABLE_ICMP |
791 | #if ENABLE_ICMP |
688 | , icmpv4_ev_watcher(this, &vpn::icmpv4_ev) |
792 | , icmpv4_ev_watcher(this, &vpn::icmpv4_ev) |
689 | #endif |
793 | #endif |
|
|
794 | #if ENABLE_DNS |
|
|
795 | , dnsv4_ev_watcher (this, &vpn::dnsv4_ev) |
|
|
796 | #endif |
690 | , tap_ev_watcher (this, &vpn::tap_ev) |
797 | , tap_ev_watcher (this, &vpn::tap_ev) |
691 | { |
798 | { |
692 | } |
799 | } |
693 | |
800 | |
694 | vpn::~vpn () |
801 | vpn::~vpn () |