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. 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 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 <list> |
34 | #include <list> |
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35 | #include <queue> |
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36 | #include <utility> |
25 | |
37 | |
26 | #include <openssl/rand.h> |
38 | #include <openssl/rand.h> |
27 | #include <openssl/evp.h> |
39 | #include <openssl/evp.h> |
28 | #include <openssl/rsa.h> |
40 | #include <openssl/rsa.h> |
29 | #include <openssl/err.h> |
41 | #include <openssl/err.h> |
… | |
… | |
45 | #define ULTRA_FAST 1 |
57 | #define ULTRA_FAST 1 |
46 | #define HLOG 15 |
58 | #define HLOG 15 |
47 | #include "lzf/lzf.h" |
59 | #include "lzf/lzf.h" |
48 | #include "lzf/lzf_c.c" |
60 | #include "lzf/lzf_c.c" |
49 | #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 | ////////////////////////////////////////////////////////////////////////////// |
50 | |
103 | |
51 | struct crypto_ctx |
104 | struct crypto_ctx |
52 | { |
105 | { |
53 | EVP_CIPHER_CTX cctx; |
106 | EVP_CIPHER_CTX cctx; |
54 | HMAC_CTX hctx; |
107 | HMAC_CTX hctx; |
… | |
… | |
82 | require (EVP_DigestUpdate(&ctx, &id, sizeof id)); |
135 | require (EVP_DigestUpdate(&ctx, &id, sizeof id)); |
83 | require (EVP_DigestFinal (&ctx, (unsigned char *)&h, 0)); |
136 | require (EVP_DigestFinal (&ctx, (unsigned char *)&h, 0)); |
84 | EVP_MD_CTX_cleanup (&ctx); |
137 | EVP_MD_CTX_cleanup (&ctx); |
85 | } |
138 | } |
86 | |
139 | |
87 | struct rsa_entry { |
140 | struct rsa_entry |
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141 | { |
88 | tstamp expire; |
142 | tstamp expire; |
89 | rsaid id; |
143 | rsaid id; |
90 | rsachallenge chg; |
144 | rsachallenge chg; |
91 | }; |
145 | }; |
92 | |
146 | |
93 | struct rsa_cache : list<rsa_entry> |
147 | struct rsa_cache : list<rsa_entry> |
94 | { |
148 | { |
95 | void cleaner_cb (ev::timer &w, int revents); ev::timer cleaner; |
149 | inline void cleaner_cb (ev::timer &w, int revents); ev::timer cleaner; |
96 | |
150 | |
97 | bool find (const rsaid &id, rsachallenge &chg) |
151 | bool find (const rsaid &id, rsachallenge &chg) |
98 | { |
152 | { |
99 | for (iterator i = begin (); i != end (); ++i) |
153 | for (iterator i = begin (); i != end (); ++i) |
100 | { |
154 | { |
101 | if (!memcmp (&id, &i->id, sizeof id) && i->expire > ev::ev_now ()) |
155 | if (!memcmp (&id, &i->id, sizeof id) && i->expire > ev_now ()) |
102 | { |
156 | { |
103 | memcpy (&chg, &i->chg, sizeof chg); |
157 | memcpy (&chg, &i->chg, sizeof chg); |
104 | |
158 | |
105 | erase (i); |
159 | erase (i); |
106 | return true; |
160 | return true; |
… | |
… | |
118 | rsa_entry e; |
172 | rsa_entry e; |
119 | |
173 | |
120 | RAND_bytes ((unsigned char *)&id, sizeof id); |
174 | RAND_bytes ((unsigned char *)&id, sizeof id); |
121 | RAND_bytes ((unsigned char *)&chg, sizeof chg); |
175 | RAND_bytes ((unsigned char *)&chg, sizeof chg); |
122 | |
176 | |
123 | e.expire = ev::ev_now () + RSA_TTL; |
177 | e.expire = ev_now () + RSA_TTL; |
124 | e.id = id; |
178 | e.id = id; |
125 | memcpy (&e.chg, &chg, sizeof chg); |
179 | memcpy (&e.chg, &chg, sizeof chg); |
126 | |
180 | |
127 | push_back (e); |
181 | push_back (e); |
128 | |
182 | |
129 | if (!cleaner.is_active ()) |
183 | if (!cleaner.is_active ()) |
130 | cleaner.again (); |
184 | cleaner.again (); |
131 | } |
185 | } |
132 | |
186 | |
133 | rsa_cache () |
187 | rsa_cache () |
134 | : cleaner (this, &rsa_cache::cleaner_cb) |
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135 | { |
188 | { |
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189 | cleaner.set<rsa_cache, &rsa_cache::cleaner_cb> (this); |
136 | cleaner.set (RSA_TTL, RSA_TTL); |
190 | cleaner.set (RSA_TTL, RSA_TTL); |
137 | } |
191 | } |
138 | |
192 | |
139 | } rsa_cache; |
193 | } rsa_cache; |
140 | |
194 | |
… | |
… | |
143 | if (empty ()) |
197 | if (empty ()) |
144 | w.stop (); |
198 | w.stop (); |
145 | else |
199 | else |
146 | { |
200 | { |
147 | for (iterator i = begin (); i != end (); ) |
201 | for (iterator i = begin (); i != end (); ) |
148 | if (i->expire <= ev::ev_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 < ev::ev_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 = ev::ev_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 + (ev::ev_now () - ri.last); |
337 | ri.diff = ri.diff * NRL_ALPHA + (ev_now () - ri.last); |
250 | |
338 | |
251 | ri.last = ev::ev_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 | |
… | |
… | |
588 | { |
676 | { |
589 | slog (L_TRACE, _("%s: possible connection establish (ictx %d, octx %d)"), conf->nodename, !!ictx, !!octx); |
677 | slog (L_TRACE, _("%s: possible connection establish (ictx %d, octx %d)"), conf->nodename, !!ictx, !!octx); |
590 | |
678 | |
591 | if (ictx && octx) |
679 | if (ictx && octx) |
592 | { |
680 | { |
593 | connectmode = conf->connectmode; |
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594 | |
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595 | // make sure rekeying timeouts are slightly asymmetric |
681 | // make sure rekeying timeouts are slightly asymmetric |
596 | ev::tstamp rekey_interval = ::conf.rekey + (conf->id > THISNODE->id ? 10 : 0); |
682 | ev::tstamp rekey_interval = ::conf.rekey + (conf->id > THISNODE->id ? 10 : 0); |
597 | rekey.start (rekey_interval, rekey_interval); |
683 | rekey.start (rekey_interval, rekey_interval); |
598 | keepalive.start (::conf.keepalive); |
684 | keepalive.start (::conf.keepalive); |
599 | |
685 | |
600 | // send queued packets |
686 | // send queued packets |
601 | if (ictx && octx) |
687 | if (ictx && octx) |
602 | { |
688 | { |
603 | while (tap_packet *p = (tap_packet *)data_queue.get ()) |
689 | while (tap_packet *p = (tap_packet *)data_queue.get ()) |
604 | { |
690 | { |
605 | send_data_packet (p); |
691 | if (p->len) send_data_packet (p); |
606 | delete p; |
692 | delete p; |
607 | } |
693 | } |
608 | |
694 | |
609 | while (vpn_packet *p = (vpn_packet *)vpn_queue.get ()) |
695 | while (vpn_packet *p = (vpn_packet *)vpn_queue.get ()) |
610 | { |
696 | { |
611 | send_vpn_packet (p, si, IPTOS_RELIABILITY); |
697 | if (p->len) send_vpn_packet (p, si, IPTOS_RELIABILITY); |
612 | delete p; |
698 | delete p; |
613 | } |
699 | } |
614 | } |
700 | } |
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701 | |
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702 | vpn->connection_established (this); |
615 | } |
703 | } |
616 | else |
704 | else |
617 | { |
705 | { |
618 | retry_cnt = 0; |
706 | retry_cnt = 0; |
619 | establish_connection.start (5); |
707 | establish_connection.start (5); |
… | |
… | |
623 | } |
711 | } |
624 | |
712 | |
625 | void |
713 | void |
626 | connection::reset_si () |
714 | connection::reset_si () |
627 | { |
715 | { |
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716 | if (vpn->can_direct (THISNODE, conf)) |
628 | protocol = best_protocol (THISNODE->protocols & conf->protocols); |
717 | protocol = best_protocol (THISNODE->protocols & conf->connectable_protocols ()); |
629 | |
718 | else |
630 | // mask out protocols we cannot establish |
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631 | if (!conf->udp_port) protocol &= ~PROT_UDPv4; |
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632 | if (!conf->tcp_port) protocol &= ~PROT_TCPv4; |
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633 | if (!conf->dns_port) protocol &= ~PROT_DNSv4; |
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634 | |
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635 | if (protocol |
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636 | && (!conf->can_direct (THISNODE) |
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637 | || !THISNODE->can_direct (conf))) |
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638 | { |
719 | { |
639 | slog (L_DEBUG, _("%s: direct connection denied"), conf->nodename); |
720 | slog (L_TRACE, _("%s: direct connection denied by config."), conf->nodename); |
640 | protocol = 0; |
721 | protocol = 0; |
641 | } |
722 | } |
642 | |
723 | |
643 | si.set (conf, protocol); |
724 | si.set (conf, protocol); |
|
|
725 | |
|
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726 | is_direct = si.valid (); |
644 | } |
727 | } |
645 | |
728 | |
646 | // ensure sockinfo is valid, forward if necessary |
729 | // ensure sockinfo is valid, forward if necessary |
647 | const sockinfo & |
730 | const sockinfo & |
648 | connection::forward_si (const sockinfo &si) const |
731 | connection::forward_si (const sockinfo &si) const |
649 | { |
732 | { |
650 | if (!si.valid ()) |
733 | if (!si.valid ()) |
651 | { |
734 | { |
652 | connection *r = vpn->find_router (); |
735 | connection *r = vpn->find_router_for (this); |
653 | |
736 | |
654 | if (r) |
737 | if (r) |
655 | { |
738 | { |
656 | 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."), |
657 | conf->nodename, r->conf->nodename, (const char *)r->si); |
740 | conf->nodename, r->conf->nodename); |
658 | return r->si; |
741 | return r->si; |
659 | } |
742 | } |
660 | else |
743 | else |
661 | slog (L_DEBUG, _("%s: node unreachable, no common protocol"), |
744 | slog (L_DEBUG, _("%s: node unreachable, no common protocol or no router available."), |
662 | conf->nodename); |
745 | conf->nodename); |
663 | } |
746 | } |
664 | |
747 | |
665 | return si; |
748 | return si; |
666 | } |
749 | } |
… | |
… | |
676 | connection::send_ping (const sockinfo &si, u8 pong) |
759 | connection::send_ping (const sockinfo &si, u8 pong) |
677 | { |
760 | { |
678 | ping_packet *pkt = new ping_packet; |
761 | ping_packet *pkt = new ping_packet; |
679 | |
762 | |
680 | 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); |
|
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764 | |
|
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765 | slog (L_TRACE, ">>%d %s [%s]", conf->id, pong ? "PT_PONG" : "PT_PING", (const char *)si); |
|
|
766 | |
681 | send_vpn_packet (pkt, si, IPTOS_LOWDELAY); |
767 | send_vpn_packet (pkt, si, IPTOS_LOWDELAY); |
682 | |
768 | |
683 | delete pkt; |
769 | delete pkt; |
684 | } |
770 | } |
685 | |
771 | |
… | |
… | |
743 | send_vpn_packet (r, si); |
829 | send_vpn_packet (r, si); |
744 | |
830 | |
745 | delete r; |
831 | delete r; |
746 | } |
832 | } |
747 | |
833 | |
748 | void |
834 | inline void |
749 | connection::establish_connection_cb (ev::timer &w, int revents) |
835 | connection::establish_connection_cb (ev::timer &w, int revents) |
750 | { |
836 | { |
751 | if (!ictx |
837 | if (!ictx |
752 | && conf != THISNODE |
838 | && conf != THISNODE |
753 | && connectmode != conf_node::C_NEVER |
839 | && connectmode != conf_node::C_NEVER |
754 | && connectmode != conf_node::C_DISABLED |
840 | && connectmode != conf_node::C_DISABLED |
755 | && !w.is_active ()) |
841 | && !w.is_active ()) |
756 | { |
842 | { |
|
|
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 | } |
|
|
850 | |
|
|
851 | last_establish_attempt = ev_now (); |
|
|
852 | |
757 | ev::tstamp retry_int = ev::tstamp (retry_cnt & 3 |
853 | ev::tstamp retry_int = ev::tstamp (retry_cnt & 3 |
758 | ? (retry_cnt & 3) + 1 |
854 | ? (retry_cnt & 3) + 1 |
759 | : 1 << (retry_cnt >> 2)); |
855 | : 1 << (retry_cnt >> 2)); |
760 | |
856 | |
761 | reset_si (); |
857 | reset_si (); |
762 | |
858 | |
763 | bool slow = si.prot & PROT_SLOW; |
859 | bool slow = si.prot & PROT_SLOW; |
764 | |
860 | |
765 | if (si.prot && !si.host) |
861 | if (si.prot && !si.host && vpn->can_direct (THISNODE, conf)) |
766 | { |
862 | { |
767 | slog (L_TRACE, _("%s: connection request (indirect)"), conf->nodename); |
|
|
768 | /*TODO*/ /* start the timer so we don't recurse endlessly */ |
863 | /*TODO*/ /* start the timer so we don't recurse endlessly */ |
769 | w.start (1); |
864 | w.start (1); |
770 | vpn->send_connect_request (conf->id); |
865 | vpn->send_connect_request (this); |
771 | } |
866 | } |
772 | else |
867 | else |
773 | { |
868 | { |
774 | slog (L_TRACE, _("%s: connection request (direct)"), conf->nodename, !!ictx, !!octx); |
869 | if (si.valid ()) |
|
|
870 | slog (L_DEBUG, _("%s: sending direct connection request to %s."), |
|
|
871 | conf->nodename, (const char *)si); |
775 | |
872 | |
776 | const sockinfo &dsi = forward_si (si); |
873 | const sockinfo &dsi = forward_si (si); |
777 | |
874 | |
778 | slow = slow || (dsi.prot & PROT_SLOW); |
875 | slow = slow || (dsi.prot & PROT_SLOW); |
779 | |
876 | |
… | |
… | |
784 | else |
881 | else |
785 | send_ping (dsi, 0); |
882 | send_ping (dsi, 0); |
786 | } |
883 | } |
787 | } |
884 | } |
788 | |
885 | |
789 | retry_int *= slow ? 8. : 0.7; |
886 | retry_int *= slow ? 8. : 0.9; |
790 | |
887 | |
791 | if (retry_int < conf->max_retry) |
888 | if (retry_int < conf->max_retry) |
792 | retry_cnt++; |
889 | retry_cnt++; |
793 | else |
890 | else |
794 | retry_int = conf->max_retry; |
891 | retry_int = conf->max_retry; |
… | |
… | |
804 | { |
901 | { |
805 | slog (L_INFO, _("%s(%s): connection lost"), |
902 | slog (L_INFO, _("%s(%s): connection lost"), |
806 | conf->nodename, (const char *)si); |
903 | conf->nodename, (const char *)si); |
807 | |
904 | |
808 | if (::conf.script_node_down) |
905 | if (::conf.script_node_down) |
809 | if (!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); |
810 | slog (L_WARN, _("node-down command execution failed, continuing.")); |
909 | run_script_queued (cb, _("node-down command execution failed, continuing.")); |
|
|
910 | } |
811 | } |
911 | } |
812 | |
912 | |
813 | delete ictx; ictx = 0; |
913 | delete ictx; ictx = 0; |
814 | delete octx; octx = 0; |
914 | delete octx; octx = 0; |
815 | #if ENABLE_DNS |
915 | #if ENABLE_DNS |
816 | dnsv4_reset_connection (); |
916 | dnsv4_reset_connection (); |
817 | #endif |
917 | #endif |
818 | |
918 | |
819 | si.host = 0; |
919 | si.host = 0; |
820 | |
920 | |
821 | last_activity = 0; |
921 | last_activity = 0.; |
|
|
922 | //last_si_change = 0.; |
822 | retry_cnt = 0; |
923 | retry_cnt = 0; |
823 | |
924 | |
824 | rekey.stop (); |
925 | rekey.stop (); |
825 | keepalive.stop (); |
926 | keepalive.stop (); |
826 | establish_connection.stop (); |
927 | establish_connection.stop (); |
… | |
… | |
833 | send_reset (si); |
934 | send_reset (si); |
834 | |
935 | |
835 | reset_connection (); |
936 | reset_connection (); |
836 | } |
937 | } |
837 | |
938 | |
838 | void |
939 | // poor-man's rekeying |
|
|
940 | inline void |
839 | connection::rekey_cb (ev::timer &w, int revents) |
941 | connection::rekey_cb (ev::timer &w, int revents) |
840 | { |
942 | { |
841 | reset_connection (); |
943 | reset_connection (); |
842 | establish_connection (); |
944 | establish_connection (); |
843 | } |
945 | } |
… | |
… | |
860 | if (oseqno > MAX_SEQNO) |
962 | if (oseqno > MAX_SEQNO) |
861 | rekey (); |
963 | rekey (); |
862 | } |
964 | } |
863 | |
965 | |
864 | 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 |
865 | connection::inject_data_packet (tap_packet *pkt, bool broadcast/*TODO DDD*/) |
977 | connection::inject_data_packet (tap_packet *pkt) |
866 | { |
978 | { |
867 | if (ictx && octx) |
979 | if (ictx && octx) |
868 | send_data_packet (pkt); |
980 | send_data_packet (pkt); |
869 | else |
981 | else |
870 | { |
982 | { |
871 | if (!broadcast) |
|
|
872 | data_queue.put (new tap_packet (*pkt)); |
983 | data_queue.put (new tap_packet (*pkt)); |
873 | |
984 | post_inject_queue (); |
874 | establish_connection (); |
|
|
875 | } |
985 | } |
876 | } |
986 | } |
877 | |
987 | |
878 | void connection::inject_vpn_packet (vpn_packet *pkt, int tos) |
988 | void connection::inject_vpn_packet (vpn_packet *pkt, int tos) |
879 | { |
989 | { |
880 | if (ictx && octx) |
990 | if (ictx && octx) |
881 | send_vpn_packet (pkt, si, tos); |
991 | send_vpn_packet (pkt, si, tos); |
882 | else |
992 | else |
883 | { |
993 | { |
884 | vpn_queue.put ((vpn_packet *)new data_packet (*(data_packet *)pkt)); |
994 | vpn_queue.put ((vpn_packet *)new data_packet (*(data_packet *)pkt)); |
885 | |
995 | post_inject_queue (); |
886 | establish_connection (); |
|
|
887 | } |
996 | } |
888 | } |
997 | } |
889 | |
998 | |
890 | void |
999 | void |
891 | connection::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi) |
1000 | connection::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi) |
892 | { |
1001 | { |
893 | last_activity = ev::ev_now (); |
1002 | last_activity = ev_now (); |
894 | |
1003 | |
895 | slog (L_NOISE, "<<%d received packet type %d from %d to %d", |
1004 | slog (L_NOISE, "<<%d received packet type %d from %d to %d.", |
896 | conf->id, pkt->typ (), pkt->src (), pkt->dst ()); |
1005 | conf->id, pkt->typ (), pkt->src (), pkt->dst ()); |
897 | |
1006 | |
898 | if (connectmode == conf_node::C_DISABLED) |
1007 | if (connectmode == conf_node::C_DISABLED) |
899 | return; |
1008 | return; |
900 | |
1009 | |
… | |
… | |
908 | { |
1017 | { |
909 | if (auth_rate_limiter.can (rsi)) |
1018 | if (auth_rate_limiter.can (rsi)) |
910 | send_auth_request (rsi, true); |
1019 | send_auth_request (rsi, true); |
911 | } |
1020 | } |
912 | else |
1021 | else |
|
|
1022 | // we would love to change thre socket address here, but ping's aren't |
|
|
1023 | // authenticated, so we best ignore it. |
913 | send_ping (rsi, 1); // pong |
1024 | send_ping (rsi, 1); // pong |
914 | |
1025 | |
915 | break; |
1026 | break; |
916 | |
1027 | |
917 | case vpn_packet::PT_PONG: |
1028 | case vpn_packet::PT_PONG: |
… | |
… | |
923 | |
1034 | |
924 | config_packet *p = (config_packet *) pkt; |
1035 | config_packet *p = (config_packet *) pkt; |
925 | |
1036 | |
926 | if (!p->chk_config ()) |
1037 | if (!p->chk_config ()) |
927 | { |
1038 | { |
928 | slog (L_WARN, _("%s(%s): protocol mismatch, disabling node"), |
1039 | slog (L_WARN, _("%s(%s): protocol mismatch, disabling node."), |
929 | conf->nodename, (const char *)rsi); |
1040 | conf->nodename, (const char *)rsi); |
930 | connectmode = conf_node::C_DISABLED; |
1041 | connectmode = conf_node::C_DISABLED; |
931 | } |
1042 | } |
932 | else if (connectmode == conf_node::C_ALWAYS) |
1043 | else if (connectmode == conf_node::C_ALWAYS) |
933 | establish_connection (); |
1044 | establish_connection (); |
… | |
… | |
975 | |
1086 | |
976 | break; |
1087 | break; |
977 | } |
1088 | } |
978 | } |
1089 | } |
979 | else |
1090 | else |
980 | slog (L_WARN, _("%s(%s): protocol mismatch"), |
1091 | slog (L_WARN, _("%s(%s): protocol mismatch."), |
981 | conf->nodename, (const char *)rsi); |
1092 | conf->nodename, (const char *)rsi); |
982 | |
1093 | |
983 | send_reset (rsi); |
1094 | send_reset (rsi); |
984 | } |
1095 | } |
985 | |
1096 | |
… | |
… | |
1000 | |
1111 | |
1001 | rsachallenge chg; |
1112 | rsachallenge chg; |
1002 | |
1113 | |
1003 | if (!rsa_cache.find (p->id, chg)) |
1114 | if (!rsa_cache.find (p->id, chg)) |
1004 | { |
1115 | { |
1005 | slog (L_ERR, _("%s(%s): unrequested auth response ignored"), |
1116 | slog (L_ERR, _("%s(%s): unrequested auth response, ignoring."), |
1006 | conf->nodename, (const char *)rsi); |
1117 | conf->nodename, (const char *)rsi); |
1007 | break; |
1118 | break; |
1008 | } |
1119 | } |
1009 | else |
1120 | else |
1010 | { |
1121 | { |
1011 | crypto_ctx *cctx = new crypto_ctx (chg, 0); |
1122 | crypto_ctx *cctx = new crypto_ctx (chg, 0); |
1012 | |
1123 | |
1013 | if (!p->hmac_chk (cctx)) |
1124 | if (!p->hmac_chk (cctx)) |
1014 | { |
1125 | { |
1015 | slog (L_ERR, _("%s(%s): hmac authentication error on auth response, received invalid packet\n" |
1126 | slog (L_ERR, _("%s(%s): hmac authentication error on auth response, received invalid packet\n" |
1016 | "could be an attack, or just corruption or a synchronization error"), |
1127 | "could be an attack, or just corruption or a synchronization error."), |
1017 | conf->nodename, (const char *)rsi); |
1128 | conf->nodename, (const char *)rsi); |
1018 | break; |
1129 | break; |
1019 | } |
1130 | } |
1020 | else |
1131 | else |
1021 | { |
1132 | { |
… | |
… | |
1032 | iseqno.reset (ntohl (*(u32 *)&chg[CHG_SEQNO]) & 0x7fffffff); // at least 2**31 sequence numbers are valid |
1143 | iseqno.reset (ntohl (*(u32 *)&chg[CHG_SEQNO]) & 0x7fffffff); // at least 2**31 sequence numbers are valid |
1033 | |
1144 | |
1034 | si = rsi; |
1145 | si = rsi; |
1035 | protocol = rsi.prot; |
1146 | protocol = rsi.prot; |
1036 | |
1147 | |
|
|
1148 | slog (L_INFO, _("%s(%s): connection established (%s), protocol version %d.%d."), |
|
|
1149 | conf->nodename, (const char *)rsi, |
|
|
1150 | is_direct ? "direct" : "routed", |
|
|
1151 | p->prot_major, p->prot_minor); |
|
|
1152 | |
1037 | connection_established (); |
1153 | connection_established (); |
1038 | |
1154 | |
1039 | slog (L_INFO, _("%s(%s): connection established, protocol version %d.%d"), |
|
|
1040 | conf->nodename, (const char *)rsi, |
|
|
1041 | p->prot_major, p->prot_minor); |
|
|
1042 | |
|
|
1043 | if (::conf.script_node_up) |
1155 | if (::conf.script_node_up) |
1044 | if (!run_script (run_script_cb (this, &connection::script_node_up), false)) |
1156 | { |
|
|
1157 | run_script_cb *cb = new run_script_cb; |
|
|
1158 | cb->set<connection, &connection::script_node_up> (this); |
1045 | slog (L_WARN, _("node-up command execution failed, continuing.")); |
1159 | run_script_queued (cb, _("node-up command execution failed, continuing.")); |
|
|
1160 | } |
1046 | |
1161 | |
1047 | break; |
1162 | break; |
1048 | } |
1163 | } |
1049 | else |
1164 | else |
1050 | slog (L_ERR, _("%s(%s): sent and received challenge do not match"), |
1165 | slog (L_ERR, _("%s(%s): sent and received challenge do not match."), |
1051 | conf->nodename, (const char *)rsi); |
1166 | conf->nodename, (const char *)rsi); |
1052 | } |
1167 | } |
1053 | |
1168 | |
1054 | delete cctx; |
1169 | delete cctx; |
1055 | } |
1170 | } |
… | |
… | |
1071 | { |
1186 | { |
1072 | vpndata_packet *p = (vpndata_packet *)pkt; |
1187 | vpndata_packet *p = (vpndata_packet *)pkt; |
1073 | |
1188 | |
1074 | if (!p->hmac_chk (ictx)) |
1189 | if (!p->hmac_chk (ictx)) |
1075 | slog (L_ERR, _("%s(%s): hmac authentication error, received invalid packet\n" |
1190 | slog (L_ERR, _("%s(%s): hmac authentication error, received invalid packet\n" |
1076 | "could be an attack, or just corruption or a synchronization error"), |
1191 | "could be an attack, or just corruption or a synchronization error."), |
1077 | conf->nodename, (const char *)rsi); |
1192 | conf->nodename, (const char *)rsi); |
1078 | else |
1193 | else |
1079 | { |
1194 | { |
1080 | u32 seqno; |
1195 | u32 seqno; |
1081 | tap_packet *d = p->unpack (this, seqno); |
1196 | tap_packet *d = p->unpack (this, seqno); |
|
|
1197 | int seqclass = iseqno.seqno_classify (seqno); |
1082 | |
1198 | |
1083 | if (iseqno.recv_ok (seqno)) |
1199 | if (seqclass == 0) // ok |
1084 | { |
1200 | { |
1085 | vpn->tap->send (d); |
1201 | vpn->tap->send (d); |
1086 | |
1202 | |
1087 | if (si != rsi) |
1203 | if (si != rsi) |
1088 | { |
1204 | { |
1089 | // fast re-sync on source address changes, useful especially for tcp/ip |
1205 | // fast re-sync on source address changes, useful especially for tcp/ip |
|
|
1206 | //if (last_si_change < ev_now () + 5.) |
|
|
1207 | // { |
1090 | si = rsi; |
1208 | si = rsi; |
1091 | |
1209 | |
1092 | slog (L_INFO, _("%s(%s): socket address changed to %s"), |
1210 | slog (L_INFO, _("%s(%s): socket address changed."), |
|
|
1211 | conf->nodename, (const char *)si); |
|
|
1212 | // } |
|
|
1213 | //else |
|
|
1214 | // slog (L_INFO, _("%s(%s): accepted packet from %s, not (yet) redirecting traffic."), |
1093 | conf->nodename, (const char *)si, (const char *)rsi); |
1215 | // conf->nodename, (const char *)si, (const char *)rsi); |
1094 | } |
1216 | } |
|
|
1217 | } |
|
|
1218 | else if (seqclass == 1) // far history |
|
|
1219 | slog (L_ERR, _("received very old packet (received %08lx, expected %08lx). " |
|
|
1220 | "possible replay attack, or just packet duplication/delay, ignoring."), seqno, iseqno.seq + 1); |
|
|
1221 | else if (seqclass == 2) // in-window duplicate, happens often on wireless |
|
|
1222 | slog (L_DEBUG, _("received recent duplicated packet (received %08lx, expected %08lx). " |
|
|
1223 | "possible replay attack, or just packet duplication, ignoring."), seqno, iseqno.seq + 1); |
|
|
1224 | else if (seqclass == 3) // reset |
|
|
1225 | { |
|
|
1226 | slog (L_ERR, _("received out-of-sync (far future) packet (received %08lx, expected %08lx). " |
|
|
1227 | "probably just massive packet loss, sending reset."), seqno, iseqno.seq + 1); |
|
|
1228 | send_reset (rsi); |
1095 | } |
1229 | } |
1096 | |
1230 | |
1097 | delete d; |
1231 | delete d; |
1098 | break; |
1232 | break; |
1099 | } |
1233 | } |
… | |
… | |
1166 | send_reset (rsi); |
1300 | send_reset (rsi); |
1167 | break; |
1301 | break; |
1168 | } |
1302 | } |
1169 | } |
1303 | } |
1170 | |
1304 | |
|
|
1305 | inline void |
1171 | void connection::keepalive_cb (ev::timer &w, int revents) |
1306 | connection::keepalive_cb (ev::timer &w, int revents) |
1172 | { |
1307 | { |
1173 | if (ev::ev_now () >= last_activity + ::conf.keepalive + 30) |
1308 | if (ev_now () >= last_activity + ::conf.keepalive + 30) |
1174 | { |
1309 | { |
1175 | reset_connection (); |
1310 | reset_connection (); |
1176 | establish_connection (); |
1311 | establish_connection (); |
1177 | } |
1312 | } |
1178 | else if (ev::ev_now () < last_activity + ::conf.keepalive) |
1313 | else if (ev_now () < last_activity + ::conf.keepalive) |
1179 | w.start (last_activity + ::conf.keepalive - ev::now ()); |
1314 | w.start (last_activity + ::conf.keepalive - ev::now ()); |
1180 | else if (conf->connectmode != conf_node::C_ONDEMAND |
1315 | else if (conf->connectmode != conf_node::C_ONDEMAND |
1181 | || THISNODE->connectmode != conf_node::C_ONDEMAND) |
1316 | || THISNODE->connectmode != conf_node::C_ONDEMAND) |
1182 | { |
1317 | { |
1183 | send_ping (si); |
1318 | send_ping (si); |
1184 | w.start (5); |
1319 | w.start (5); |
1185 | } |
1320 | } |
1186 | else if (ev::ev_now () < last_activity + ::conf.keepalive + 10) |
1321 | else if (ev_now () < last_activity + ::conf.keepalive + 10) |
1187 | // hold ondemand connections implicitly a few seconds longer |
1322 | // hold ondemand connections implicitly a few seconds longer |
1188 | // should delete octx, though, or something like that ;) |
1323 | // should delete octx, though, or something like that ;) |
1189 | w.start (last_activity + ::conf.keepalive + 10 - ev::now ()); |
1324 | w.start (last_activity + ::conf.keepalive + 10 - ev::now ()); |
1190 | else |
1325 | else |
1191 | reset_connection (); |
1326 | reset_connection (); |
… | |
… | |
1221 | asprintf (&env, "DESTNODE=%s", conf->nodename); putenv (env); |
1356 | asprintf (&env, "DESTNODE=%s", conf->nodename); putenv (env); |
1222 | asprintf (&env, "DESTIP=%s", si.ntoa ()); putenv (env); |
1357 | asprintf (&env, "DESTIP=%s", si.ntoa ()); putenv (env); |
1223 | asprintf (&env, "DESTPORT=%d", ntohs (si.port)); putenv (env); |
1358 | asprintf (&env, "DESTPORT=%d", ntohs (si.port)); putenv (env); |
1224 | } |
1359 | } |
1225 | |
1360 | |
|
|
1361 | inline const char * |
1226 | const char *connection::script_node_up () |
1362 | connection::script_node_up () |
1227 | { |
1363 | { |
1228 | script_init_connect_env (); |
1364 | script_init_connect_env (); |
1229 | |
1365 | |
1230 | putenv ((char *)"STATE=up"); |
1366 | putenv ((char *)"STATE=up"); |
1231 | |
1367 | |
… | |
… | |
1236 | ::conf.script_node_up ? ::conf.script_node_up : "node-up"); |
1372 | ::conf.script_node_up ? ::conf.script_node_up : "node-up"); |
1237 | |
1373 | |
1238 | return filename; |
1374 | return filename; |
1239 | } |
1375 | } |
1240 | |
1376 | |
|
|
1377 | inline const char * |
1241 | const char *connection::script_node_down () |
1378 | connection::script_node_down () |
1242 | { |
1379 | { |
1243 | script_init_connect_env (); |
1380 | script_init_connect_env (); |
1244 | |
1381 | |
1245 | putenv ((char *)"STATE=down"); |
1382 | putenv ((char *)"STATE=down"); |
1246 | |
1383 | |
… | |
… | |
1252 | |
1389 | |
1253 | return filename; |
1390 | return filename; |
1254 | } |
1391 | } |
1255 | |
1392 | |
1256 | connection::connection (struct vpn *vpn, conf_node *conf) |
1393 | connection::connection (struct vpn *vpn, conf_node *conf) |
1257 | : vpn(vpn), conf(conf) |
1394 | : vpn(vpn), conf(conf), |
1258 | , rekey (this, &connection::rekey_cb) |
|
|
1259 | , keepalive (this, &connection::keepalive_cb) |
|
|
1260 | , establish_connection (this, &connection::establish_connection_cb) |
|
|
1261 | #if ENABLE_DNS |
1395 | #if ENABLE_DNS |
1262 | , dns (0) |
1396 | dns (0), |
1263 | #endif |
1397 | #endif |
|
|
1398 | data_queue(conf->max_ttl, conf->max_queue + 1), |
|
|
1399 | vpn_queue(conf->max_ttl, conf->max_queue + 1) |
1264 | { |
1400 | { |
|
|
1401 | rekey .set<connection, &connection::rekey_cb > (this); |
|
|
1402 | keepalive .set<connection, &connection::keepalive_cb > (this); |
|
|
1403 | establish_connection.set<connection, &connection::establish_connection_cb> (this); |
|
|
1404 | |
|
|
1405 | last_establish_attempt = 0.; |
1265 | octx = ictx = 0; |
1406 | octx = ictx = 0; |
1266 | retry_cnt = 0; |
|
|
1267 | |
1407 | |
1268 | if (!conf->protocols) // make sure some protocol is enabled |
1408 | if (!conf->protocols) // make sure some protocol is enabled |
1269 | conf->protocols = PROT_UDPv4; |
1409 | conf->protocols = PROT_UDPv4; |
1270 | |
1410 | |
1271 | connectmode = conf_node::C_ALWAYS; // initial setting |
1411 | connectmode = conf->connectmode; |
|
|
1412 | |
|
|
1413 | // queue a dummy packet to force an initial connection attempt |
|
|
1414 | if (connectmode != conf_node::C_ALWAYS && connectmode != conf_node::C_DISABLED) |
|
|
1415 | vpn_queue.put (new net_packet); |
|
|
1416 | |
1272 | reset_connection (); |
1417 | reset_connection (); |
1273 | } |
1418 | } |
1274 | |
1419 | |
1275 | connection::~connection () |
1420 | connection::~connection () |
1276 | { |
1421 | { |