1 | /* |
1 | /* |
2 | connection.C -- manage a single connection |
2 | connection.C -- manage a single connection |
3 | Copyright (C) 2003-2005 Marc Lehmann <gvpe@schmorp.de> |
3 | Copyright (C) 2003-2008 Marc Lehmann <gvpe@schmorp.de> |
4 | |
4 | |
5 | This file is part of GVPE. |
5 | This file is part of GVPE. |
6 | |
6 | |
7 | GVPE is free software; you can redistribute it and/or modify |
7 | GVPE is free software; you can redistribute it and/or modify it |
8 | it under the terms of the GNU General Public License as published by |
8 | under the terms of the GNU General Public License as published by the |
9 | the Free Software Foundation; either version 2 of the License, or |
9 | Free Software Foundation; either version 3 of the License, or (at your |
10 | (at your option) any later version. |
10 | option) any later version. |
11 | |
11 | |
12 | This program is distributed in the hope that it will be useful, |
12 | This program is distributed in the hope that it will be useful, but |
13 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
13 | WITHOUT ANY WARRANTY; without even the implied warranty of |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General |
15 | GNU General Public License for more details. |
15 | Public License for more details. |
16 | |
16 | |
17 | You should have received a copy of the GNU General Public License |
17 | You should have received a copy of the GNU General Public License along |
18 | along with gvpe; if not, write to the Free Software |
18 | with this program; if not, see <http://www.gnu.org/licenses/>. |
19 | Foundation, Inc. 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
19 | |
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20 | Additional permission under GNU GPL version 3 section 7 |
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21 | |
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22 | If you modify this Program, or any covered work, by linking or |
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23 | combining it with the OpenSSL project's OpenSSL library (or a modified |
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24 | version of that library), containing parts covered by the terms of the |
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25 | OpenSSL or SSLeay licenses, the licensors of this Program grant you |
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26 | additional permission to convey the resulting work. Corresponding |
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27 | Source for a non-source form of such a combination shall include the |
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28 | source code for the parts of OpenSSL used as well as that of the |
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29 | covered work. |
20 | */ |
30 | */ |
21 | |
31 | |
22 | #include "config.h" |
32 | #include "config.h" |
23 | |
33 | |
24 | #include <cassert> |
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25 | |
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26 | #include <list> |
34 | #include <list> |
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35 | #include <queue> |
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36 | #include <utility> |
27 | |
37 | |
28 | #include <openssl/rand.h> |
38 | #include <openssl/rand.h> |
29 | #include <openssl/evp.h> |
39 | #include <openssl/evp.h> |
30 | #include <openssl/rsa.h> |
40 | #include <openssl/rsa.h> |
31 | #include <openssl/err.h> |
41 | #include <openssl/err.h> |
… | |
… | |
47 | #define ULTRA_FAST 1 |
57 | #define ULTRA_FAST 1 |
48 | #define HLOG 15 |
58 | #define HLOG 15 |
49 | #include "lzf/lzf.h" |
59 | #include "lzf/lzf.h" |
50 | #include "lzf/lzf_c.c" |
60 | #include "lzf/lzf_c.c" |
51 | #include "lzf/lzf_d.c" |
61 | #include "lzf/lzf_d.c" |
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62 | |
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63 | ////////////////////////////////////////////////////////////////////////////// |
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64 | |
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65 | static std::queue< std::pair<run_script_cb *, const char *> > rs_queue; |
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66 | static ev::child rs_child_ev; |
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67 | |
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68 | void // c++ requires external linkage here, apparently :( |
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69 | rs_child_cb (ev::child &w, int revents) |
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70 | { |
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71 | w.stop (); |
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72 | |
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73 | if (rs_queue.empty ()) |
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74 | return; |
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75 | |
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76 | pid_t pid = run_script (*rs_queue.front ().first, false); |
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77 | if (pid) |
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78 | { |
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79 | w.set (pid); |
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80 | w.start (); |
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81 | } |
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82 | else |
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83 | slog (L_WARN, rs_queue.front ().second); |
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84 | |
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85 | delete rs_queue.front ().first; |
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86 | rs_queue.pop (); |
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87 | } |
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88 | |
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89 | // despite the fancy name, this is quite a hack |
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90 | static void |
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91 | run_script_queued (run_script_cb *cb, const char *warnmsg) |
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92 | { |
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93 | rs_queue.push (std::make_pair (cb, warnmsg)); |
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94 | |
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95 | if (!rs_child_ev.is_active ()) |
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96 | { |
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97 | rs_child_ev.set<rs_child_cb> (); |
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98 | rs_child_ev (); |
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99 | } |
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100 | } |
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101 | |
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102 | ////////////////////////////////////////////////////////////////////////////// |
52 | |
103 | |
53 | struct crypto_ctx |
104 | struct crypto_ctx |
54 | { |
105 | { |
55 | EVP_CIPHER_CTX cctx; |
106 | EVP_CIPHER_CTX cctx; |
56 | HMAC_CTX hctx; |
107 | HMAC_CTX hctx; |
… | |
… | |
84 | require (EVP_DigestUpdate(&ctx, &id, sizeof id)); |
135 | require (EVP_DigestUpdate(&ctx, &id, sizeof id)); |
85 | require (EVP_DigestFinal (&ctx, (unsigned char *)&h, 0)); |
136 | require (EVP_DigestFinal (&ctx, (unsigned char *)&h, 0)); |
86 | EVP_MD_CTX_cleanup (&ctx); |
137 | EVP_MD_CTX_cleanup (&ctx); |
87 | } |
138 | } |
88 | |
139 | |
89 | struct rsa_entry { |
140 | struct rsa_entry |
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141 | { |
90 | tstamp expire; |
142 | tstamp expire; |
91 | rsaid id; |
143 | rsaid id; |
92 | rsachallenge chg; |
144 | rsachallenge chg; |
93 | }; |
145 | }; |
94 | |
146 | |
95 | struct rsa_cache : list<rsa_entry> |
147 | struct rsa_cache : list<rsa_entry> |
96 | { |
148 | { |
97 | void cleaner_cb (time_watcher &w); time_watcher cleaner; |
149 | inline void cleaner_cb (ev::timer &w, int revents); ev::timer cleaner; |
98 | |
150 | |
99 | bool find (const rsaid &id, rsachallenge &chg) |
151 | bool find (const rsaid &id, rsachallenge &chg) |
100 | { |
152 | { |
101 | for (iterator i = begin (); i != end (); ++i) |
153 | for (iterator i = begin (); i != end (); ++i) |
102 | { |
154 | { |
103 | if (!memcmp (&id, &i->id, sizeof id) && i->expire > NOW) |
155 | if (!memcmp (&id, &i->id, sizeof id) && i->expire > ev_now ()) |
104 | { |
156 | { |
105 | memcpy (&chg, &i->chg, sizeof chg); |
157 | memcpy (&chg, &i->chg, sizeof chg); |
106 | |
158 | |
107 | erase (i); |
159 | erase (i); |
108 | return true; |
160 | return true; |
109 | } |
161 | } |
110 | } |
162 | } |
111 | |
163 | |
112 | if (cleaner.at < NOW) |
164 | if (!cleaner.is_active ()) |
113 | cleaner.start (NOW + RSA_TTL); |
165 | cleaner.again (); |
114 | |
166 | |
115 | return false; |
167 | return false; |
116 | } |
168 | } |
117 | |
169 | |
118 | void gen (rsaid &id, rsachallenge &chg) |
170 | void gen (rsaid &id, rsachallenge &chg) |
119 | { |
171 | { |
120 | rsa_entry e; |
172 | rsa_entry e; |
121 | |
173 | |
122 | RAND_bytes ((unsigned char *)&id, sizeof id); |
174 | RAND_bytes ((unsigned char *)&id, sizeof id); |
123 | RAND_bytes ((unsigned char *)&chg, sizeof chg); |
175 | RAND_bytes ((unsigned char *)&chg, sizeof chg); |
124 | |
176 | |
125 | e.expire = NOW + RSA_TTL; |
177 | e.expire = ev_now () + RSA_TTL; |
126 | e.id = id; |
178 | e.id = id; |
127 | memcpy (&e.chg, &chg, sizeof chg); |
179 | memcpy (&e.chg, &chg, sizeof chg); |
128 | |
180 | |
129 | push_back (e); |
181 | push_back (e); |
130 | |
182 | |
131 | if (cleaner.at < NOW) |
183 | if (!cleaner.is_active ()) |
132 | cleaner.start (NOW + RSA_TTL); |
184 | cleaner.again (); |
133 | } |
185 | } |
134 | |
186 | |
135 | rsa_cache () |
187 | rsa_cache () |
136 | : cleaner (this, &rsa_cache::cleaner_cb) |
188 | { |
137 | { } |
189 | cleaner.set<rsa_cache, &rsa_cache::cleaner_cb> (this); |
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190 | cleaner.set (RSA_TTL, RSA_TTL); |
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191 | } |
138 | |
192 | |
139 | } rsa_cache; |
193 | } rsa_cache; |
140 | |
194 | |
141 | void rsa_cache::cleaner_cb (time_watcher &w) |
195 | void rsa_cache::cleaner_cb (ev::timer &w, int revents) |
142 | { |
196 | { |
143 | if (!empty ()) |
197 | if (empty ()) |
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198 | w.stop (); |
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199 | else |
144 | { |
200 | { |
145 | w.start (NOW + RSA_TTL); |
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146 | |
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147 | for (iterator i = begin (); i != end (); ) |
201 | for (iterator i = begin (); i != end (); ) |
148 | if (i->expire <= NOW) |
202 | if (i->expire <= ev_now ()) |
149 | i = erase (i); |
203 | i = erase (i); |
150 | else |
204 | else |
151 | ++i; |
205 | ++i; |
152 | } |
206 | } |
153 | } |
207 | } |
154 | |
208 | |
155 | ////////////////////////////////////////////////////////////////////////////// |
209 | ////////////////////////////////////////////////////////////////////////////// |
156 | |
210 | |
157 | void pkt_queue::put (net_packet *p) |
211 | pkt_queue::pkt_queue (double max_ttl, int max_queue) |
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212 | : max_ttl (max_ttl), max_queue (max_queue) |
158 | { |
213 | { |
159 | if (queue[i]) |
214 | queue = new pkt [max_queue]; |
160 | { |
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161 | delete queue[i]; |
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162 | j = (j + 1) % QUEUEDEPTH; |
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163 | } |
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164 | |
215 | |
165 | queue[i] = p; |
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166 | |
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167 | i = (i + 1) % QUEUEDEPTH; |
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168 | } |
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169 | |
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170 | net_packet *pkt_queue::get () |
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171 | { |
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172 | net_packet *p = queue[j]; |
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173 | |
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174 | if (p) |
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175 | { |
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176 | queue[j] = 0; |
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177 | j = (j + 1) % QUEUEDEPTH; |
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178 | } |
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179 | |
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180 | return p; |
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181 | } |
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182 | |
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183 | pkt_queue::pkt_queue () |
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184 | { |
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185 | memset (queue, 0, sizeof (queue)); |
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186 | i = 0; |
216 | i = 0; |
187 | j = 0; |
217 | j = 0; |
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218 | |
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219 | expire.set<pkt_queue, &pkt_queue::expire_cb> (this); |
188 | } |
220 | } |
189 | |
221 | |
190 | pkt_queue::~pkt_queue () |
222 | pkt_queue::~pkt_queue () |
191 | { |
223 | { |
192 | for (i = QUEUEDEPTH; --i > 0; ) |
224 | while (net_packet *p = get ()) |
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225 | delete p; |
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226 | |
193 | delete queue[i]; |
227 | delete [] queue; |
194 | } |
228 | } |
195 | |
229 | |
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230 | void pkt_queue::expire_cb (ev::timer &w, int revents) |
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231 | { |
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232 | ev_tstamp expire = ev_now () - max_ttl; |
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233 | |
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234 | for (;;) |
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235 | { |
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236 | if (empty ()) |
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237 | break; |
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238 | |
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239 | double diff = queue[j].tstamp - expire; |
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240 | |
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241 | if (diff >= 0.) |
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242 | { |
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243 | w.start (diff > 0.5 ? diff : 0.5); |
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244 | break; |
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245 | } |
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246 | |
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247 | delete get (); |
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248 | } |
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249 | } |
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250 | |
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251 | void pkt_queue::put (net_packet *p) |
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252 | { |
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253 | ev_tstamp now = ev_now (); |
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254 | |
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255 | // start expiry timer |
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256 | if (empty ()) |
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257 | expire.start (max_ttl); |
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258 | |
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259 | int ni = i + 1 == max_queue ? 0 : i + 1; |
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260 | |
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261 | if (ni == j) |
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262 | delete get (); |
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263 | |
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264 | queue[i].pkt = p; |
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265 | queue[i].tstamp = now; |
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266 | |
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267 | i = ni; |
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268 | } |
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269 | |
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270 | net_packet *pkt_queue::get () |
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271 | { |
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272 | if (empty ()) |
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273 | return 0; |
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274 | |
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275 | net_packet *p = queue[j].pkt; |
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276 | queue[j].pkt = 0; |
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277 | |
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278 | j = j + 1 == max_queue ? 0 : j + 1; |
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279 | |
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280 | return p; |
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281 | } |
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282 | |
196 | struct net_rateinfo { |
283 | struct net_rateinfo |
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284 | { |
197 | u32 host; |
285 | u32 host; |
198 | double pcnt, diff; |
286 | double pcnt, diff; |
199 | tstamp last; |
287 | tstamp last; |
200 | }; |
288 | }; |
201 | |
289 | |
… | |
… | |
220 | iterator i; |
308 | iterator i; |
221 | |
309 | |
222 | for (i = begin (); i != end (); ) |
310 | for (i = begin (); i != end (); ) |
223 | if (i->host == host) |
311 | if (i->host == host) |
224 | break; |
312 | break; |
225 | else if (i->last < NOW - NRL_EXPIRE) |
313 | else if (i->last < ev_now () - NRL_EXPIRE) |
226 | i = erase (i); |
314 | i = erase (i); |
227 | else |
315 | else |
228 | i++; |
316 | i++; |
229 | |
317 | |
230 | if (i == end ()) |
318 | if (i == end ()) |
… | |
… | |
232 | net_rateinfo ri; |
320 | net_rateinfo ri; |
233 | |
321 | |
234 | ri.host = host; |
322 | ri.host = host; |
235 | ri.pcnt = 1.; |
323 | ri.pcnt = 1.; |
236 | ri.diff = NRL_MAXDIF; |
324 | ri.diff = NRL_MAXDIF; |
237 | ri.last = NOW; |
325 | ri.last = ev_now (); |
238 | |
326 | |
239 | push_front (ri); |
327 | push_front (ri); |
240 | |
328 | |
241 | return true; |
329 | return true; |
242 | } |
330 | } |
… | |
… | |
244 | { |
332 | { |
245 | net_rateinfo ri (*i); |
333 | net_rateinfo ri (*i); |
246 | erase (i); |
334 | erase (i); |
247 | |
335 | |
248 | ri.pcnt = ri.pcnt * NRL_ALPHA; |
336 | ri.pcnt = ri.pcnt * NRL_ALPHA; |
249 | ri.diff = ri.diff * NRL_ALPHA + (NOW - ri.last); |
337 | ri.diff = ri.diff * NRL_ALPHA + (ev_now () - ri.last); |
250 | |
338 | |
251 | ri.last = NOW; |
339 | ri.last = ev_now (); |
252 | |
340 | |
253 | double dif = ri.diff / ri.pcnt; |
341 | double dif = ri.diff / ri.pcnt; |
254 | |
342 | |
255 | bool send = dif > NRL_CUTOFF; |
343 | bool send = dif > NRL_CUTOFF; |
256 | |
344 | |
… | |
… | |
465 | #if ENABLE_COMPRESSION |
553 | #if ENABLE_COMPRESSION |
466 | f |= FEATURE_COMPRESSION; |
554 | f |= FEATURE_COMPRESSION; |
467 | #endif |
555 | #endif |
468 | #if ENABLE_ROHC |
556 | #if ENABLE_ROHC |
469 | f |= FEATURE_ROHC; |
557 | f |= FEATURE_ROHC; |
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558 | #endif |
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559 | #if ENABLE_BRIDGING |
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560 | f |= FEATURE_BRIDGING; |
470 | #endif |
561 | #endif |
471 | return f; |
562 | return f; |
472 | } |
563 | } |
473 | }; |
564 | }; |
474 | |
565 | |
… | |
… | |
581 | ///////////////////////////////////////////////////////////////////////////// |
672 | ///////////////////////////////////////////////////////////////////////////// |
582 | |
673 | |
583 | void |
674 | void |
584 | connection::connection_established () |
675 | connection::connection_established () |
585 | { |
676 | { |
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677 | slog (L_NOISE, _("%s: possible connection establish (ictx %d, octx %d)"), conf->nodename, !!ictx, !!octx); |
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678 | |
586 | if (ictx && octx) |
679 | if (ictx && octx) |
587 | { |
680 | { |
588 | connectmode = conf->connectmode; |
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589 | |
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590 | // make sure rekeying timeouts are slightly asymmetric |
681 | // make sure rekeying timeouts are slightly asymmetric |
591 | rekey.start (NOW + ::conf.rekey |
682 | ev::tstamp rekey_interval = ::conf.rekey + (conf->id > THISNODE->id ? 10 : 0); |
592 | + (conf->id > THISNODE->id ? 10 : 0)); |
683 | rekey.start (rekey_interval, rekey_interval); |
593 | keepalive.start (NOW + ::conf.keepalive); |
684 | keepalive.start (::conf.keepalive); |
594 | |
685 | |
595 | // send queued packets |
686 | // send queued packets |
596 | if (ictx && octx) |
687 | if (ictx && octx) |
597 | { |
688 | { |
598 | while (tap_packet *p = (tap_packet *)data_queue.get ()) |
689 | while (tap_packet *p = (tap_packet *)data_queue.get ()) |
599 | { |
690 | { |
600 | send_data_packet (p); |
691 | if (p->len) send_data_packet (p); |
601 | delete p; |
692 | delete p; |
602 | } |
693 | } |
603 | |
694 | |
604 | while (vpn_packet *p = (vpn_packet *)vpn_queue.get ()) |
695 | while (vpn_packet *p = (vpn_packet *)vpn_queue.get ()) |
605 | { |
696 | { |
606 | send_vpn_packet (p, si, IPTOS_RELIABILITY); |
697 | if (p->len) send_vpn_packet (p, si, IPTOS_RELIABILITY); |
607 | delete p; |
698 | delete p; |
608 | } |
699 | } |
609 | } |
700 | } |
|
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701 | |
|
|
702 | vpn->connection_established (this); |
610 | } |
703 | } |
611 | else |
704 | else |
612 | { |
705 | { |
613 | retry_cnt = 0; |
706 | retry_cnt = 0; |
614 | establish_connection.start (NOW + 5); |
707 | establish_connection.start (5); |
615 | keepalive.stop (); |
708 | keepalive.stop (); |
616 | rekey.stop (); |
709 | rekey.stop (); |
617 | } |
710 | } |
618 | } |
711 | } |
619 | |
712 | |
620 | void |
713 | void |
621 | connection::reset_si () |
714 | connection::reset_si () |
622 | { |
715 | { |
|
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716 | if (vpn->can_direct (THISNODE, conf)) |
623 | protocol = best_protocol (THISNODE->protocols & conf->protocols); |
717 | protocol = best_protocol (THISNODE->protocols & conf->connectable_protocols ()); |
624 | |
718 | else |
625 | // mask out protocols we cannot establish |
719 | { |
626 | if (!conf->udp_port) protocol &= ~PROT_UDPv4; |
720 | slog (L_TRACE, _("%s: direct connection denied by config."), conf->nodename); |
627 | if (!conf->tcp_port) protocol &= ~PROT_TCPv4; |
721 | protocol = 0; |
628 | if (!conf->dns_port) protocol &= ~PROT_DNSv4; |
722 | } |
629 | |
723 | |
630 | si.set (conf, protocol); |
724 | si.set (conf, protocol); |
|
|
725 | |
|
|
726 | is_direct = si.valid (); |
631 | } |
727 | } |
632 | |
728 | |
633 | // ensure sockinfo is valid, forward if necessary |
729 | // ensure sockinfo is valid, forward if necessary |
634 | const sockinfo & |
730 | const sockinfo & |
635 | connection::forward_si (const sockinfo &si) const |
731 | connection::forward_si (const sockinfo &si) const |
636 | { |
732 | { |
637 | if (!si.valid ()) |
733 | if (!si.valid ()) |
638 | { |
734 | { |
639 | connection *r = vpn->find_router (); |
735 | connection *r = vpn->find_router_for (this); |
640 | |
736 | |
641 | if (r) |
737 | if (r) |
642 | { |
738 | { |
643 | slog (L_DEBUG, _("%s: no common protocol, trying indirectly through %s (%s)"), |
739 | slog (L_DEBUG, _("%s: no common protocol, trying to route through %s."), |
644 | conf->nodename, r->conf->nodename, (const char *)r->si); |
740 | conf->nodename, r->conf->nodename); |
645 | return r->si; |
741 | return r->si; |
646 | } |
742 | } |
647 | else |
743 | else |
648 | slog (L_DEBUG, _("%s: node unreachable, no common protocol"), |
744 | slog (L_DEBUG, _("%s: node unreachable, no common protocol or no router available."), |
649 | conf->nodename); |
745 | conf->nodename); |
650 | } |
746 | } |
651 | |
747 | |
652 | return si; |
748 | return si; |
653 | } |
749 | } |
… | |
… | |
663 | connection::send_ping (const sockinfo &si, u8 pong) |
759 | connection::send_ping (const sockinfo &si, u8 pong) |
664 | { |
760 | { |
665 | ping_packet *pkt = new ping_packet; |
761 | ping_packet *pkt = new ping_packet; |
666 | |
762 | |
667 | pkt->setup (conf->id, pong ? ping_packet::PT_PONG : ping_packet::PT_PING); |
763 | pkt->setup (conf->id, pong ? ping_packet::PT_PONG : ping_packet::PT_PING); |
|
|
764 | |
|
|
765 | slog (L_TRACE, "%s << %s [%s]", conf->nodename, pong ? "PT_PONG" : "PT_PING", (const char *)si); |
|
|
766 | |
668 | send_vpn_packet (pkt, si, IPTOS_LOWDELAY); |
767 | send_vpn_packet (pkt, si, IPTOS_LOWDELAY); |
669 | |
768 | |
670 | delete pkt; |
769 | delete pkt; |
671 | } |
770 | } |
672 | |
771 | |
… | |
… | |
691 | |
790 | |
692 | rsachallenge chg; |
791 | rsachallenge chg; |
693 | rsa_cache.gen (pkt->id, chg); |
792 | rsa_cache.gen (pkt->id, chg); |
694 | rsa_encrypt (conf->rsa_key, chg, pkt->encr); |
793 | rsa_encrypt (conf->rsa_key, chg, pkt->encr); |
695 | |
794 | |
696 | slog (L_TRACE, ">>%d PT_AUTH_REQ [%s]", conf->id, (const char *)si); |
795 | slog (L_TRACE, "%s >> PT_AUTH_REQ [%s]", conf->nodename, (const char *)si); |
697 | |
796 | |
698 | send_vpn_packet (pkt, si, IPTOS_RELIABILITY | IPTOS_LOWDELAY); // rsa is very very costly |
797 | send_vpn_packet (pkt, si, IPTOS_RELIABILITY | IPTOS_LOWDELAY); // rsa is very very costly |
699 | |
798 | |
700 | delete pkt; |
799 | delete pkt; |
701 | } |
800 | } |
… | |
… | |
709 | |
808 | |
710 | rsa_hash (id, chg, pkt->response); |
809 | rsa_hash (id, chg, pkt->response); |
711 | |
810 | |
712 | pkt->hmac_set (octx); |
811 | pkt->hmac_set (octx); |
713 | |
812 | |
714 | slog (L_TRACE, ">>%d PT_AUTH_RES [%s]", conf->id, (const char *)si); |
813 | slog (L_TRACE, "%s >> PT_AUTH_RES [%s]", conf->nodename, (const char *)si); |
715 | |
814 | |
716 | send_vpn_packet (pkt, si, IPTOS_RELIABILITY); // rsa is very very costly |
815 | send_vpn_packet (pkt, si, IPTOS_RELIABILITY); // rsa is very very costly |
717 | |
816 | |
718 | delete pkt; |
817 | delete pkt; |
719 | } |
818 | } |
720 | |
819 | |
721 | void |
820 | void |
722 | connection::send_connect_info (int rid, const sockinfo &rsi, u8 rprotocols) |
821 | connection::send_connect_info (int rid, const sockinfo &rsi, u8 rprotocols) |
723 | { |
822 | { |
724 | slog (L_TRACE, ">>%d PT_CONNECT_INFO(%d,%s)\n", |
823 | slog (L_TRACE, "%s >> PT_CONNECT_INFO(%s,%s)", conf->nodename, |
725 | conf->id, rid, (const char *)rsi); |
824 | vpn->conns[rid - 1]->conf->nodename, (const char *)rsi); |
726 | |
825 | |
727 | connect_info_packet *r = new connect_info_packet (conf->id, rid, rsi, rprotocols); |
826 | connect_info_packet *r = new connect_info_packet (conf->id, rid, rsi, rprotocols); |
728 | |
827 | |
729 | r->hmac_set (octx); |
828 | r->hmac_set (octx); |
730 | send_vpn_packet (r, si); |
829 | send_vpn_packet (r, si); |
731 | |
830 | |
732 | delete r; |
831 | delete r; |
733 | } |
832 | } |
734 | |
833 | |
735 | void |
834 | inline void |
736 | connection::establish_connection_cb (time_watcher &w) |
835 | connection::establish_connection_cb (ev::timer &w, int revents) |
737 | { |
836 | { |
738 | if (!ictx |
837 | if (!ictx |
739 | && conf != THISNODE |
838 | && conf != THISNODE |
740 | && connectmode != conf_node::C_NEVER |
839 | && connectmode != conf_node::C_NEVER |
741 | && connectmode != conf_node::C_DISABLED |
840 | && connectmode != conf_node::C_DISABLED |
742 | && NOW > w.at) |
841 | && !w.is_active ()) |
743 | { |
842 | { |
744 | w.at = TSTAMP_MAX; // first disable this watcher in case of recursion |
843 | // a bit hacky, if ondemand, and packets are no longer queued, then reset the connection |
|
|
844 | // and stop trying. should probably be handled by a per-connection expire handler. |
|
|
845 | if (connectmode == conf_node::C_ONDEMAND && vpn_queue.empty () && data_queue.empty ()) |
|
|
846 | { |
|
|
847 | reset_connection (); |
|
|
848 | return; |
|
|
849 | } |
745 | |
850 | |
746 | double retry_int = double (retry_cnt & 3 |
851 | last_establish_attempt = ev_now (); |
|
|
852 | |
|
|
853 | ev::tstamp retry_int = ev::tstamp (retry_cnt & 3 |
747 | ? (retry_cnt & 3) + 1 |
854 | ? (retry_cnt & 3) + 1 |
748 | : 1 << (retry_cnt >> 2)); |
855 | : 1 << (retry_cnt >> 2)); |
749 | |
856 | |
750 | reset_si (); |
857 | reset_si (); |
751 | |
858 | |
752 | bool slow = si.prot & PROT_SLOW; |
859 | bool slow = si.prot & PROT_SLOW; |
753 | |
860 | |
754 | if (si.prot && !si.host) |
861 | if (si.prot && !si.host && vpn->can_direct (THISNODE, conf)) |
|
|
862 | { |
|
|
863 | /*TODO*/ /* start the timer so we don't recurse endlessly */ |
|
|
864 | w.start (1); |
755 | vpn->send_connect_request (conf->id); |
865 | vpn->send_connect_request (this); |
|
|
866 | } |
756 | else |
867 | else |
757 | { |
868 | { |
|
|
869 | if (si.valid ()) |
|
|
870 | slog (L_DEBUG, _("%s: sending direct connection request to %s."), |
|
|
871 | conf->nodename, (const char *)si); |
|
|
872 | |
758 | const sockinfo &dsi = forward_si (si); |
873 | const sockinfo &dsi = forward_si (si); |
759 | |
874 | |
760 | slow = slow || (dsi.prot & PROT_SLOW); |
875 | slow = slow || (dsi.prot & PROT_SLOW); |
761 | |
876 | |
762 | if (dsi.valid () && auth_rate_limiter.can (dsi)) |
877 | if (dsi.valid () && auth_rate_limiter.can (dsi)) |
… | |
… | |
766 | else |
881 | else |
767 | send_ping (dsi, 0); |
882 | send_ping (dsi, 0); |
768 | } |
883 | } |
769 | } |
884 | } |
770 | |
885 | |
771 | retry_int *= slow ? 8. : 0.7; |
886 | retry_int *= slow ? 8. : 0.9; |
772 | |
887 | |
773 | if (retry_int < conf->max_retry) |
888 | if (retry_int < conf->max_retry) |
774 | retry_cnt++; |
889 | retry_cnt++; |
775 | else |
890 | else |
776 | retry_int = conf->max_retry; |
891 | retry_int = conf->max_retry; |
777 | |
892 | |
778 | w.start (NOW + retry_int); |
893 | w.start (retry_int); |
779 | } |
894 | } |
780 | } |
895 | } |
781 | |
896 | |
782 | void |
897 | void |
783 | connection::reset_connection () |
898 | connection::reset_connection () |
… | |
… | |
786 | { |
901 | { |
787 | slog (L_INFO, _("%s(%s): connection lost"), |
902 | slog (L_INFO, _("%s(%s): connection lost"), |
788 | conf->nodename, (const char *)si); |
903 | conf->nodename, (const char *)si); |
789 | |
904 | |
790 | if (::conf.script_node_down) |
905 | if (::conf.script_node_down) |
791 | run_script (run_script_cb (this, &connection::script_node_down), false); |
906 | { |
|
|
907 | run_script_cb *cb = new run_script_cb; |
|
|
908 | cb->set<connection, &connection::script_node_down> (this); |
|
|
909 | run_script_queued (cb, _("node-down command execution failed, continuing.")); |
|
|
910 | } |
792 | } |
911 | } |
793 | |
912 | |
794 | delete ictx; ictx = 0; |
913 | delete ictx; ictx = 0; |
795 | delete octx; octx = 0; |
914 | delete octx; octx = 0; |
796 | #if ENABLE_DNS |
915 | #if ENABLE_DNS |
797 | dnsv4_reset_connection (); |
916 | dnsv4_reset_connection (); |
798 | #endif |
917 | #endif |
799 | |
918 | |
800 | si.host = 0; |
919 | si.host = 0; |
801 | |
920 | |
802 | last_activity = 0; |
921 | last_activity = 0.; |
|
|
922 | //last_si_change = 0.; |
803 | retry_cnt = 0; |
923 | retry_cnt = 0; |
804 | |
924 | |
805 | rekey.stop (); |
925 | rekey.stop (); |
806 | keepalive.stop (); |
926 | keepalive.stop (); |
807 | establish_connection.stop (); |
927 | establish_connection.stop (); |
… | |
… | |
814 | send_reset (si); |
934 | send_reset (si); |
815 | |
935 | |
816 | reset_connection (); |
936 | reset_connection (); |
817 | } |
937 | } |
818 | |
938 | |
819 | void |
939 | // poor-man's rekeying |
820 | connection::rekey_cb (time_watcher &w) |
940 | inline void |
|
|
941 | connection::rekey_cb (ev::timer &w, int revents) |
821 | { |
942 | { |
822 | reset_connection (); |
943 | reset_connection (); |
823 | establish_connection (); |
944 | establish_connection (); |
824 | } |
945 | } |
825 | |
946 | |
… | |
… | |
841 | if (oseqno > MAX_SEQNO) |
962 | if (oseqno > MAX_SEQNO) |
842 | rekey (); |
963 | rekey (); |
843 | } |
964 | } |
844 | |
965 | |
845 | void |
966 | void |
|
|
967 | connection::post_inject_queue () |
|
|
968 | { |
|
|
969 | // force a connection every now and when when packets are sent (max 1/s) |
|
|
970 | if (ev_now () - last_establish_attempt >= 0.95) // arbitrary |
|
|
971 | establish_connection.stop (); |
|
|
972 | |
|
|
973 | establish_connection (); |
|
|
974 | } |
|
|
975 | |
|
|
976 | void |
846 | connection::inject_data_packet (tap_packet *pkt, bool broadcast/*TODO DDD*/) |
977 | connection::inject_data_packet (tap_packet *pkt) |
847 | { |
978 | { |
848 | if (ictx && octx) |
979 | if (ictx && octx) |
849 | send_data_packet (pkt); |
980 | send_data_packet (pkt); |
850 | else |
981 | else |
851 | { |
982 | { |
852 | if (!broadcast)//DDDD |
|
|
853 | data_queue.put (new tap_packet (*pkt)); |
983 | data_queue.put (new tap_packet (*pkt)); |
854 | |
984 | post_inject_queue (); |
855 | establish_connection (); |
|
|
856 | } |
985 | } |
857 | } |
986 | } |
858 | |
987 | |
859 | void connection::inject_vpn_packet (vpn_packet *pkt, int tos) |
988 | void connection::inject_vpn_packet (vpn_packet *pkt, int tos) |
860 | { |
989 | { |
861 | if (ictx && octx) |
990 | if (ictx && octx) |
862 | send_vpn_packet (pkt, si, tos); |
991 | send_vpn_packet (pkt, si, tos); |
863 | else |
992 | else |
864 | { |
993 | { |
865 | vpn_queue.put ((vpn_packet *)new data_packet (*(data_packet *)pkt)); |
994 | vpn_queue.put ((vpn_packet *)new data_packet (*(data_packet *)pkt)); |
866 | |
995 | post_inject_queue (); |
867 | establish_connection (); |
|
|
868 | } |
996 | } |
869 | } |
997 | } |
870 | |
998 | |
871 | void |
999 | void |
872 | connection::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi) |
1000 | connection::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi) |
873 | { |
1001 | { |
874 | last_activity = NOW; |
1002 | last_activity = ev_now (); |
875 | |
1003 | |
876 | slog (L_NOISE, "<<%d received packet type %d from %d to %d", |
1004 | slog (L_NOISE, "%s >> received packet type %d from %d to %d.", |
877 | conf->id, pkt->typ (), pkt->src (), pkt->dst ()); |
1005 | conf->nodename, pkt->typ (), pkt->src (), pkt->dst ()); |
|
|
1006 | |
|
|
1007 | if (connectmode == conf_node::C_DISABLED) |
|
|
1008 | return; |
878 | |
1009 | |
879 | switch (pkt->typ ()) |
1010 | switch (pkt->typ ()) |
880 | { |
1011 | { |
881 | case vpn_packet::PT_PING: |
1012 | case vpn_packet::PT_PING: |
|
|
1013 | slog (L_TRACE, "%s >> PT_PING", conf->nodename); |
|
|
1014 | |
882 | // we send pings instead of auth packets after some retries, |
1015 | // we send pings instead of auth packets after some retries, |
883 | // so reset the retry counter and establish a connection |
1016 | // so reset the retry counter and establish a connection |
884 | // when we receive a ping. |
1017 | // when we receive a ping. |
885 | if (!ictx) |
1018 | if (!ictx) |
886 | { |
1019 | { |
887 | if (auth_rate_limiter.can (rsi)) |
1020 | if (auth_rate_limiter.can (rsi)) |
888 | send_auth_request (rsi, true); |
1021 | send_auth_request (rsi, true); |
889 | } |
1022 | } |
890 | else |
1023 | else |
|
|
1024 | // we would love to change thre socket address here, but ping's aren't |
|
|
1025 | // authenticated, so we best ignore it. |
891 | send_ping (rsi, 1); // pong |
1026 | send_ping (rsi, 1); // pong |
892 | |
1027 | |
893 | break; |
1028 | break; |
894 | |
1029 | |
895 | case vpn_packet::PT_PONG: |
1030 | case vpn_packet::PT_PONG: |
|
|
1031 | slog (L_TRACE, "%s >> PT_PONG", conf->nodename); |
896 | break; |
1032 | break; |
897 | |
1033 | |
898 | case vpn_packet::PT_RESET: |
1034 | case vpn_packet::PT_RESET: |
899 | { |
1035 | { |
900 | reset_connection (); |
1036 | reset_connection (); |
901 | |
1037 | |
902 | config_packet *p = (config_packet *) pkt; |
1038 | config_packet *p = (config_packet *) pkt; |
903 | |
1039 | |
904 | if (!p->chk_config ()) |
1040 | if (!p->chk_config ()) |
905 | { |
1041 | { |
906 | slog (L_WARN, _("%s(%s): protocol mismatch, disabling node"), |
1042 | slog (L_WARN, _("%s(%s): protocol mismatch, disabling node."), |
907 | conf->nodename, (const char *)rsi); |
1043 | conf->nodename, (const char *)rsi); |
908 | connectmode = conf_node::C_DISABLED; |
1044 | connectmode = conf_node::C_DISABLED; |
909 | } |
1045 | } |
910 | else if (connectmode == conf_node::C_ALWAYS) |
1046 | else if (connectmode == conf_node::C_ALWAYS) |
911 | establish_connection (); |
1047 | establish_connection (); |
… | |
… | |
915 | case vpn_packet::PT_AUTH_REQ: |
1051 | case vpn_packet::PT_AUTH_REQ: |
916 | if (auth_rate_limiter.can (rsi)) |
1052 | if (auth_rate_limiter.can (rsi)) |
917 | { |
1053 | { |
918 | auth_req_packet *p = (auth_req_packet *) pkt; |
1054 | auth_req_packet *p = (auth_req_packet *) pkt; |
919 | |
1055 | |
920 | slog (L_TRACE, "<<%d PT_AUTH_REQ(%d)", conf->id, p->initiate); |
1056 | slog (L_TRACE, "%s << PT_AUTH_REQ(%s)", conf->nodename, p->initiate ? "initiate" : "reply"); |
921 | |
1057 | |
922 | if (p->chk_config () && !strncmp (p->magic, MAGIC, 8)) |
1058 | if (p->chk_config () && !strncmp (p->magic, MAGIC, 8)) |
923 | { |
1059 | { |
924 | if (p->prot_minor != PROTOCOL_MINOR) |
1060 | if (p->prot_minor != PROTOCOL_MINOR) |
925 | slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."), |
1061 | slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."), |
… | |
… | |
953 | |
1089 | |
954 | break; |
1090 | break; |
955 | } |
1091 | } |
956 | } |
1092 | } |
957 | else |
1093 | else |
958 | slog (L_WARN, _("%s(%s): protocol mismatch"), |
1094 | slog (L_WARN, _("%s(%s): protocol mismatch."), |
959 | conf->nodename, (const char *)rsi); |
1095 | conf->nodename, (const char *)rsi); |
960 | |
1096 | |
961 | send_reset (rsi); |
1097 | send_reset (rsi); |
962 | } |
1098 | } |
963 | |
1099 | |
964 | break; |
1100 | break; |
965 | |
1101 | |
966 | case vpn_packet::PT_AUTH_RES: |
1102 | case vpn_packet::PT_AUTH_RES: |
967 | { |
1103 | { |
968 | auth_res_packet *p = (auth_res_packet *) pkt; |
1104 | auth_res_packet *p = (auth_res_packet *)pkt; |
969 | |
1105 | |
970 | slog (L_TRACE, "<<%d PT_AUTH_RES", conf->id); |
1106 | slog (L_TRACE, "%s << PT_AUTH_RES", conf->nodename); |
971 | |
1107 | |
972 | if (p->chk_config ()) |
1108 | if (p->chk_config ()) |
973 | { |
1109 | { |
974 | if (p->prot_minor != PROTOCOL_MINOR) |
1110 | if (p->prot_minor != PROTOCOL_MINOR) |
975 | slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."), |
1111 | slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."), |
… | |
… | |
978 | |
1114 | |
979 | rsachallenge chg; |
1115 | rsachallenge chg; |
980 | |
1116 | |
981 | if (!rsa_cache.find (p->id, chg)) |
1117 | if (!rsa_cache.find (p->id, chg)) |
982 | { |
1118 | { |
983 | slog (L_ERR, _("%s(%s): unrequested auth response ignored"), |
1119 | slog (L_ERR, _("%s(%s): unrequested auth response, ignoring."), |
984 | conf->nodename, (const char *)rsi); |
1120 | conf->nodename, (const char *)rsi); |
985 | break; |
1121 | break; |
986 | } |
1122 | } |
987 | else |
1123 | else |
988 | { |
1124 | { |
989 | crypto_ctx *cctx = new crypto_ctx (chg, 0); |
1125 | crypto_ctx *cctx = new crypto_ctx (chg, 0); |
990 | |
1126 | |
991 | if (!p->hmac_chk (cctx)) |
1127 | if (!p->hmac_chk (cctx)) |
992 | { |
1128 | { |
993 | slog (L_ERR, _("%s(%s): hmac authentication error on auth response, received invalid packet\n" |
1129 | slog (L_ERR, _("%s(%s): hmac authentication error on auth response, received invalid packet\n" |
994 | "could be an attack, or just corruption or a synchronization error"), |
1130 | "could be an attack, or just corruption or a synchronization error."), |
995 | conf->nodename, (const char *)rsi); |
1131 | conf->nodename, (const char *)rsi); |
996 | break; |
1132 | break; |
997 | } |
1133 | } |
998 | else |
1134 | else |
999 | { |
1135 | { |
… | |
… | |
1010 | iseqno.reset (ntohl (*(u32 *)&chg[CHG_SEQNO]) & 0x7fffffff); // at least 2**31 sequence numbers are valid |
1146 | iseqno.reset (ntohl (*(u32 *)&chg[CHG_SEQNO]) & 0x7fffffff); // at least 2**31 sequence numbers are valid |
1011 | |
1147 | |
1012 | si = rsi; |
1148 | si = rsi; |
1013 | protocol = rsi.prot; |
1149 | protocol = rsi.prot; |
1014 | |
1150 | |
|
|
1151 | slog (L_INFO, _("%s(%s): connection established (%s), protocol version %d.%d."), |
|
|
1152 | conf->nodename, (const char *)rsi, |
|
|
1153 | is_direct ? "direct" : "routed", |
|
|
1154 | p->prot_major, p->prot_minor); |
|
|
1155 | |
1015 | connection_established (); |
1156 | connection_established (); |
1016 | |
1157 | |
1017 | slog (L_INFO, _("%s(%s): connection established, protocol version %d.%d"), |
|
|
1018 | conf->nodename, (const char *)rsi, |
|
|
1019 | p->prot_major, p->prot_minor); |
|
|
1020 | |
|
|
1021 | if (::conf.script_node_up) |
1158 | if (::conf.script_node_up) |
1022 | run_script (run_script_cb (this, &connection::script_node_up), false); |
1159 | { |
|
|
1160 | run_script_cb *cb = new run_script_cb; |
|
|
1161 | cb->set<connection, &connection::script_node_up> (this); |
|
|
1162 | run_script_queued (cb, _("node-up command execution failed, continuing.")); |
|
|
1163 | } |
1023 | |
1164 | |
1024 | break; |
1165 | break; |
1025 | } |
1166 | } |
1026 | else |
1167 | else |
1027 | slog (L_ERR, _("%s(%s): sent and received challenge do not match"), |
1168 | slog (L_ERR, _("%s(%s): sent and received challenge do not match."), |
1028 | conf->nodename, (const char *)rsi); |
1169 | conf->nodename, (const char *)rsi); |
1029 | } |
1170 | } |
1030 | |
1171 | |
1031 | delete cctx; |
1172 | delete cctx; |
1032 | } |
1173 | } |
… | |
… | |
1048 | { |
1189 | { |
1049 | vpndata_packet *p = (vpndata_packet *)pkt; |
1190 | vpndata_packet *p = (vpndata_packet *)pkt; |
1050 | |
1191 | |
1051 | if (!p->hmac_chk (ictx)) |
1192 | if (!p->hmac_chk (ictx)) |
1052 | slog (L_ERR, _("%s(%s): hmac authentication error, received invalid packet\n" |
1193 | slog (L_ERR, _("%s(%s): hmac authentication error, received invalid packet\n" |
1053 | "could be an attack, or just corruption or a synchronization error"), |
1194 | "could be an attack, or just corruption or a synchronization error."), |
1054 | conf->nodename, (const char *)rsi); |
1195 | conf->nodename, (const char *)rsi); |
1055 | else |
1196 | else |
1056 | { |
1197 | { |
1057 | u32 seqno; |
1198 | u32 seqno; |
1058 | tap_packet *d = p->unpack (this, seqno); |
1199 | tap_packet *d = p->unpack (this, seqno); |
|
|
1200 | int seqclass = iseqno.seqno_classify (seqno); |
1059 | |
1201 | |
1060 | if (iseqno.recv_ok (seqno)) |
1202 | if (seqclass == 0) // ok |
1061 | { |
1203 | { |
1062 | vpn->tap->send (d); |
1204 | vpn->tap->send (d); |
1063 | |
1205 | |
1064 | if (si != rsi) |
1206 | if (si != rsi) |
1065 | { |
1207 | { |
1066 | // fast re-sync on connection changes, useful especially for tcp/ip |
1208 | // fast re-sync on source address changes, useful especially for tcp/ip |
|
|
1209 | //if (last_si_change < ev_now () + 5.) |
1067 | si = rsi; |
1210 | // { |
1068 | |
|
|
1069 | slog (L_INFO, _("%s(%s): socket address changed to %s"), |
1211 | slog (L_INFO, _("%s(%s): changing socket address to %s."), |
1070 | conf->nodename, (const char *)si, (const char *)rsi); |
1212 | conf->nodename, (const char *)si, (const char *)rsi); |
|
|
1213 | |
|
|
1214 | si = rsi; |
|
|
1215 | // } |
|
|
1216 | //else |
|
|
1217 | // slog (L_INFO, _("%s(%s): accepted packet from %s, not (yet) redirecting traffic."), |
|
|
1218 | // conf->nodename, (const char *)si, (const char *)rsi); |
1071 | } |
1219 | } |
|
|
1220 | } |
|
|
1221 | else if (seqclass == 1) // far history |
|
|
1222 | slog (L_ERR, _("received very old packet (received %08lx, expected %08lx). " |
|
|
1223 | "possible replay attack, or just packet duplication/delay, ignoring."), seqno, iseqno.seq + 1); |
|
|
1224 | else if (seqclass == 2) // in-window duplicate, happens often on wireless |
|
|
1225 | slog (L_DEBUG, _("received recent duplicated packet (received %08lx, expected %08lx). " |
|
|
1226 | "possible replay attack, or just packet duplication, ignoring."), seqno, iseqno.seq + 1); |
|
|
1227 | else if (seqclass == 3) // reset |
|
|
1228 | { |
|
|
1229 | slog (L_ERR, _("received out-of-sync (far future) packet (received %08lx, expected %08lx). " |
|
|
1230 | "probably just massive packet loss, sending reset."), seqno, iseqno.seq + 1); |
|
|
1231 | send_reset (rsi); |
1072 | } |
1232 | } |
1073 | |
1233 | |
1074 | delete d; |
1234 | delete d; |
1075 | break; |
1235 | break; |
1076 | } |
1236 | } |
… | |
… | |
1082 | case vpn_packet::PT_CONNECT_REQ: |
1242 | case vpn_packet::PT_CONNECT_REQ: |
1083 | if (ictx && octx && rsi == si && pkt->hmac_chk (ictx)) |
1243 | if (ictx && octx && rsi == si && pkt->hmac_chk (ictx)) |
1084 | { |
1244 | { |
1085 | connect_req_packet *p = (connect_req_packet *) pkt; |
1245 | connect_req_packet *p = (connect_req_packet *) pkt; |
1086 | |
1246 | |
1087 | assert (p->id > 0 && p->id <= vpn->conns.size ()); // hmac-auth does not mean we accept anything |
1247 | if (p->id > 0 && p->id <= vpn->conns.size ()) |
1088 | connection *c = vpn->conns[p->id - 1]; |
|
|
1089 | conf->protocols = p->protocols; |
|
|
1090 | |
|
|
1091 | slog (L_TRACE, "<<%d PT_CONNECT_REQ(%d) [%d]\n", |
|
|
1092 | conf->id, p->id, c->ictx && c->octx); |
|
|
1093 | |
|
|
1094 | if (c->ictx && c->octx) |
|
|
1095 | { |
1248 | { |
|
|
1249 | connection *c = vpn->conns[p->id - 1]; |
|
|
1250 | conf->protocols = p->protocols; |
|
|
1251 | |
|
|
1252 | slog (L_TRACE, "%s << PT_CONNECT_REQ(%s) [%d]", |
|
|
1253 | conf->nodename, vpn->conns[p->id - 1]->conf->nodename, c->ictx && c->octx); |
|
|
1254 | |
|
|
1255 | if (c->ictx && c->octx) |
|
|
1256 | { |
1096 | // send connect_info packets to both sides, in case one is |
1257 | // send connect_info packets to both sides, in case one is |
1097 | // behind a nat firewall (or both ;) |
1258 | // behind a nat firewall (or both ;) |
1098 | c->send_connect_info (conf->id, si, conf->protocols); |
1259 | c->send_connect_info (conf->id, si, conf->protocols); |
1099 | send_connect_info (c->conf->id, c->si, c->conf->protocols); |
1260 | send_connect_info (c->conf->id, c->si, c->conf->protocols); |
|
|
1261 | } |
|
|
1262 | else |
|
|
1263 | c->establish_connection (); |
1100 | } |
1264 | } |
1101 | else |
1265 | else |
1102 | c->establish_connection (); |
1266 | slog (L_WARN, |
|
|
1267 | _("received authenticated connection request from unknown node #%d, config file mismatch?"), |
|
|
1268 | p->id); |
1103 | } |
1269 | } |
1104 | |
1270 | |
1105 | break; |
1271 | break; |
1106 | |
1272 | |
1107 | case vpn_packet::PT_CONNECT_INFO: |
1273 | case vpn_packet::PT_CONNECT_INFO: |
1108 | if (ictx && octx && rsi == si && pkt->hmac_chk (ictx)) |
1274 | if (ictx && octx && rsi == si && pkt->hmac_chk (ictx)) |
1109 | { |
1275 | { |
1110 | connect_info_packet *p = (connect_info_packet *)pkt; |
1276 | connect_info_packet *p = (connect_info_packet *)pkt; |
1111 | |
1277 | |
1112 | if (p->id > 0 && p->id <= vpn->conns.size ()) // hmac-auth does not mean we accept anything |
1278 | if (p->id > 0 && p->id <= vpn->conns.size ()) |
1113 | { |
1279 | { |
1114 | connection *c = vpn->conns[p->id - 1]; |
1280 | connection *c = vpn->conns[p->id - 1]; |
1115 | |
1281 | |
1116 | c->conf->protocols = p->protocols; |
1282 | c->conf->protocols = p->protocols; |
1117 | protocol = best_protocol (c->conf->protocols & THISNODE->protocols & p->si.supported_protocols (c->conf)); |
1283 | protocol = best_protocol (c->conf->protocols & THISNODE->protocols & p->si.supported_protocols (c->conf)); |
1118 | p->si.upgrade_protocol (protocol, c->conf); |
1284 | p->si.upgrade_protocol (protocol, c->conf); |
1119 | |
1285 | |
1120 | slog (L_TRACE, "<<%d PT_CONNECT_INFO(%d,%s) (%d)", |
1286 | slog (L_TRACE, "%s << PT_CONNECT_INFO(%s,%s) [%d]", |
|
|
1287 | conf->nodename, vpn->conns[p->id - 1]->conf->nodename, |
1121 | conf->id, p->id, (const char *)p->si, !c->ictx && !c->octx); |
1288 | (const char *)p->si, !c->ictx && !c->octx); |
1122 | |
1289 | |
1123 | const sockinfo &dsi = forward_si (p->si); |
1290 | const sockinfo &dsi = forward_si (p->si); |
1124 | |
1291 | |
1125 | if (dsi.valid ()) |
1292 | if (dsi.valid ()) |
1126 | c->send_auth_request (dsi, true); |
1293 | c->send_auth_request (dsi, true); |
1127 | } |
1294 | } |
|
|
1295 | else |
|
|
1296 | slog (L_WARN, |
|
|
1297 | _("received authenticated connection request from unknown node #%d, config file mismatch?"), |
|
|
1298 | p->id); |
1128 | } |
1299 | } |
1129 | |
1300 | |
1130 | break; |
1301 | break; |
1131 | |
1302 | |
1132 | default: |
1303 | default: |
1133 | send_reset (rsi); |
1304 | send_reset (rsi); |
1134 | break; |
1305 | break; |
1135 | } |
1306 | } |
1136 | } |
1307 | } |
1137 | |
1308 | |
1138 | void connection::keepalive_cb (time_watcher &w) |
1309 | inline void |
|
|
1310 | connection::keepalive_cb (ev::timer &w, int revents) |
1139 | { |
1311 | { |
1140 | if (NOW >= last_activity + ::conf.keepalive + 30) |
1312 | if (ev_now () >= last_activity + ::conf.keepalive + 30) |
1141 | { |
1313 | { |
1142 | reset_connection (); |
1314 | reset_connection (); |
1143 | establish_connection (); |
1315 | establish_connection (); |
1144 | } |
1316 | } |
1145 | else if (NOW < last_activity + ::conf.keepalive) |
1317 | else if (ev_now () < last_activity + ::conf.keepalive) |
1146 | w.start (last_activity + ::conf.keepalive); |
1318 | w.start (last_activity + ::conf.keepalive - ev::now ()); |
1147 | else if (conf->connectmode != conf_node::C_ONDEMAND |
1319 | else if (conf->connectmode != conf_node::C_ONDEMAND |
1148 | || THISNODE->connectmode != conf_node::C_ONDEMAND) |
1320 | || THISNODE->connectmode != conf_node::C_ONDEMAND) |
1149 | { |
1321 | { |
1150 | send_ping (si); |
1322 | send_ping (si); |
1151 | w.start (NOW + 5); |
1323 | w.start (5); |
1152 | } |
1324 | } |
1153 | else if (NOW < last_activity + ::conf.keepalive + 10) |
1325 | else if (ev_now () < last_activity + ::conf.keepalive + 10) |
1154 | // hold ondemand connections implicitly a few seconds longer |
1326 | // hold ondemand connections implicitly a few seconds longer |
1155 | // should delete octx, though, or something like that ;) |
1327 | // should delete octx, though, or something like that ;) |
1156 | w.start (last_activity + ::conf.keepalive + 10); |
1328 | w.start (last_activity + ::conf.keepalive + 10 - ev::now ()); |
1157 | else |
1329 | else |
1158 | reset_connection (); |
1330 | reset_connection (); |
1159 | } |
1331 | } |
1160 | |
1332 | |
1161 | void connection::send_connect_request (int id) |
1333 | void connection::send_connect_request (int id) |
1162 | { |
1334 | { |
1163 | connect_req_packet *p = new connect_req_packet (conf->id, id, conf->protocols); |
1335 | connect_req_packet *p = new connect_req_packet (conf->id, id, conf->protocols); |
1164 | |
1336 | |
1165 | slog (L_TRACE, ">>%d PT_CONNECT_REQ(%d)", conf->id, id); |
1337 | slog (L_TRACE, "%s >> PT_CONNECT_REQ(%s)", |
|
|
1338 | conf->nodename, vpn->conns[id - 1]->conf->nodename); |
1166 | p->hmac_set (octx); |
1339 | p->hmac_set (octx); |
1167 | send_vpn_packet (p, si); |
1340 | send_vpn_packet (p, si); |
1168 | |
1341 | |
1169 | delete p; |
1342 | delete p; |
1170 | } |
1343 | } |
1171 | |
1344 | |
|
|
1345 | void connection::script_init_env (const char *ext) |
|
|
1346 | { |
|
|
1347 | char *env; |
|
|
1348 | asprintf (&env, "IFUPDATA%s=%s", ext, conf->if_up_data); putenv (env); |
|
|
1349 | asprintf (&env, "NODENAME%s=%s", ext, conf->nodename); putenv (env); |
|
|
1350 | asprintf (&env, "MAC%s=%02x:%02x:%02x:%02x:%02x:%02x", ext, |
|
|
1351 | 0xfe, 0xfd, 0x80, 0x00, conf->id >> 8, |
|
|
1352 | conf->id & 0xff); putenv (env); |
|
|
1353 | } |
|
|
1354 | |
1172 | void connection::script_node () |
1355 | void connection::script_init_connect_env () |
1173 | { |
1356 | { |
1174 | vpn->script_if_up (); |
1357 | vpn->script_init_env (); |
1175 | |
1358 | |
1176 | char *env; |
1359 | char *env; |
1177 | asprintf (&env, "DESTID=%d", conf->id); putenv (env); |
1360 | asprintf (&env, "DESTID=%d", conf->id); putenv (env); |
1178 | asprintf (&env, "DESTNODE=%s", conf->nodename); putenv (env); |
1361 | asprintf (&env, "DESTNODE=%s", conf->nodename); putenv (env); |
1179 | asprintf (&env, "DESTIP=%s", si.ntoa ()); putenv (env); |
1362 | asprintf (&env, "DESTIP=%s", si.ntoa ()); putenv (env); |
1180 | asprintf (&env, "DESTPORT=%d", ntohs (si.port)); putenv (env); |
1363 | asprintf (&env, "DESTPORT=%d", ntohs (si.port)); putenv (env); |
1181 | } |
1364 | } |
1182 | |
1365 | |
|
|
1366 | inline const char * |
1183 | const char *connection::script_node_up () |
1367 | connection::script_node_up () |
1184 | { |
1368 | { |
1185 | script_node (); |
1369 | script_init_connect_env (); |
1186 | |
1370 | |
1187 | putenv ("STATE=up"); |
1371 | putenv ((char *)"STATE=up"); |
1188 | |
1372 | |
|
|
1373 | char *filename; |
|
|
1374 | asprintf (&filename, |
|
|
1375 | "%s/%s", |
|
|
1376 | confbase, |
1189 | return ::conf.script_node_up ? ::conf.script_node_up : "node-up"; |
1377 | ::conf.script_node_up ? ::conf.script_node_up : "node-up"); |
1190 | } |
|
|
1191 | |
1378 | |
|
|
1379 | return filename; |
|
|
1380 | } |
|
|
1381 | |
|
|
1382 | inline const char * |
1192 | const char *connection::script_node_down () |
1383 | connection::script_node_down () |
1193 | { |
1384 | { |
1194 | script_node (); |
1385 | script_init_connect_env (); |
1195 | |
1386 | |
1196 | putenv ("STATE=down"); |
1387 | putenv ((char *)"STATE=down"); |
1197 | |
1388 | |
1198 | return ::conf.script_node_up ? ::conf.script_node_down : "node-down"; |
1389 | char *filename; |
|
|
1390 | asprintf (&filename, |
|
|
1391 | "%s/%s", |
|
|
1392 | confbase, |
|
|
1393 | ::conf.script_node_down ? ::conf.script_node_down : "node-down"); |
|
|
1394 | |
|
|
1395 | return filename; |
1199 | } |
1396 | } |
1200 | |
1397 | |
1201 | connection::connection (struct vpn *vpn, conf_node *conf) |
1398 | connection::connection (struct vpn *vpn, conf_node *conf) |
1202 | : vpn(vpn), conf(conf) |
1399 | : vpn(vpn), conf(conf), |
1203 | , rekey (this, &connection::rekey_cb) |
|
|
1204 | , keepalive (this, &connection::keepalive_cb) |
|
|
1205 | , establish_connection (this, &connection::establish_connection_cb) |
|
|
1206 | #if ENABLE_DNS |
1400 | #if ENABLE_DNS |
1207 | , dns (0) |
1401 | dns (0), |
1208 | #endif |
1402 | #endif |
|
|
1403 | data_queue(conf->max_ttl, conf->max_queue + 1), |
|
|
1404 | vpn_queue(conf->max_ttl, conf->max_queue + 1) |
1209 | { |
1405 | { |
|
|
1406 | rekey .set<connection, &connection::rekey_cb > (this); |
|
|
1407 | keepalive .set<connection, &connection::keepalive_cb > (this); |
|
|
1408 | establish_connection.set<connection, &connection::establish_connection_cb> (this); |
|
|
1409 | |
|
|
1410 | last_establish_attempt = 0.; |
1210 | octx = ictx = 0; |
1411 | octx = ictx = 0; |
1211 | retry_cnt = 0; |
|
|
1212 | |
1412 | |
1213 | if (!conf->protocols) // make sure some protocol is enabled |
1413 | if (!conf->protocols) // make sure some protocol is enabled |
1214 | conf->protocols = PROT_UDPv4; |
1414 | conf->protocols = PROT_UDPv4; |
1215 | |
1415 | |
1216 | connectmode = conf_node::C_ALWAYS; // initial setting |
1416 | connectmode = conf->connectmode; |
|
|
1417 | |
|
|
1418 | // queue a dummy packet to force an initial connection attempt |
|
|
1419 | if (connectmode != conf_node::C_ALWAYS && connectmode != conf_node::C_DISABLED) |
|
|
1420 | vpn_queue.put (new net_packet); |
|
|
1421 | |
1217 | reset_connection (); |
1422 | reset_connection (); |
1218 | } |
1423 | } |
1219 | |
1424 | |
1220 | connection::~connection () |
1425 | connection::~connection () |
1221 | { |
1426 | { |