1 | /* |
1 | /* |
2 | connection.C -- manage a single connection |
2 | connection.C -- manage a single connection |
3 | Copyright (C) 2003-2004 Marc Lehmann <pcg@goof.com> |
3 | Copyright (C) 2003-2008 Marc Lehmann <gvpe@schmorp.de> |
4 | |
4 | |
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5 | This file is part of GVPE. |
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6 | |
5 | This program is free software; you can redistribute it and/or modify |
7 | GVPE is free software; you can redistribute it and/or modify it |
6 | 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 |
7 | the Free Software Foundation; either version 2 of the License, or |
9 | Free Software Foundation; either version 3 of the License, or (at your |
8 | (at your option) any later version. |
10 | option) any later version. |
9 | |
11 | |
10 | This program is distributed in the hope that it will be useful, |
12 | This program is distributed in the hope that it will be useful, but |
11 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
13 | WITHOUT ANY WARRANTY; without even the implied warranty of |
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General |
13 | GNU General Public License for more details. |
15 | Public License for more details. |
14 | |
16 | |
15 | You should have received a copy of the GNU General Public License |
17 | You should have received a copy of the GNU General Public License along |
16 | along with this program; if not, write to the Free Software |
18 | with this program; if not, see <http://www.gnu.org/licenses/>. |
17 | 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. |
18 | */ |
30 | */ |
19 | |
31 | |
20 | #include "config.h" |
32 | #include "config.h" |
21 | |
33 | |
22 | extern "C" { |
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23 | # include "lzf/lzf.h" |
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24 | } |
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25 | |
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26 | #include <cassert> |
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27 | |
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28 | #include <list> |
34 | #include <list> |
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35 | #include <queue> |
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36 | #include <utility> |
29 | |
37 | |
30 | #include <openssl/rand.h> |
38 | #include <openssl/rand.h> |
31 | #include <openssl/evp.h> |
39 | #include <openssl/evp.h> |
32 | #include <openssl/rsa.h> |
40 | #include <openssl/rsa.h> |
33 | #include <openssl/err.h> |
41 | #include <openssl/err.h> |
34 | |
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35 | #include "gettext.h" |
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36 | |
42 | |
37 | #include "conf.h" |
43 | #include "conf.h" |
38 | #include "slog.h" |
44 | #include "slog.h" |
39 | #include "device.h" |
45 | #include "device.h" |
40 | #include "vpn.h" |
46 | #include "vpn.h" |
… | |
… | |
46 | # define RAND_pseudo_bytes RAND_bytes |
52 | # define RAND_pseudo_bytes RAND_bytes |
47 | #endif |
53 | #endif |
48 | |
54 | |
49 | #define MAGIC "vped\xbd\xc6\xdb\x82" // 8 bytes of magic |
55 | #define MAGIC "vped\xbd\xc6\xdb\x82" // 8 bytes of magic |
50 | |
56 | |
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57 | #define ULTRA_FAST 1 |
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58 | #define HLOG 15 |
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59 | #include "lzf/lzf.h" |
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60 | #include "lzf/lzf_c.c" |
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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 | ////////////////////////////////////////////////////////////////////////////// |
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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; |
55 | |
108 | |
… | |
… | |
58 | }; |
111 | }; |
59 | |
112 | |
60 | crypto_ctx::crypto_ctx (const rsachallenge &challenge, int enc) |
113 | crypto_ctx::crypto_ctx (const rsachallenge &challenge, int enc) |
61 | { |
114 | { |
62 | EVP_CIPHER_CTX_init (&cctx); |
115 | EVP_CIPHER_CTX_init (&cctx); |
63 | EVP_CipherInit_ex (&cctx, CIPHER, 0, &challenge[CHG_CIPHER_KEY], 0, enc); |
116 | require (EVP_CipherInit_ex (&cctx, CIPHER, 0, &challenge[CHG_CIPHER_KEY], 0, enc)); |
64 | HMAC_CTX_init (&hctx); |
117 | HMAC_CTX_init (&hctx); |
65 | HMAC_Init_ex (&hctx, &challenge[CHG_HMAC_KEY], HMAC_KEYLEN, DIGEST, 0); |
118 | HMAC_Init_ex (&hctx, &challenge[CHG_HMAC_KEY], HMAC_KEYLEN, DIGEST, 0); |
66 | } |
119 | } |
67 | |
120 | |
68 | crypto_ctx::~crypto_ctx () |
121 | crypto_ctx::~crypto_ctx () |
69 | { |
122 | { |
70 | EVP_CIPHER_CTX_cleanup (&cctx); |
123 | require (EVP_CIPHER_CTX_cleanup (&cctx)); |
71 | HMAC_CTX_cleanup (&hctx); |
124 | HMAC_CTX_cleanup (&hctx); |
72 | } |
125 | } |
73 | |
126 | |
74 | static void |
127 | static void |
75 | rsa_hash (const rsaid &id, const rsachallenge &chg, rsaresponse &h) |
128 | rsa_hash (const rsaid &id, const rsachallenge &chg, rsaresponse &h) |
76 | { |
129 | { |
77 | EVP_MD_CTX ctx; |
130 | EVP_MD_CTX ctx; |
78 | |
131 | |
79 | EVP_MD_CTX_init (&ctx); |
132 | EVP_MD_CTX_init (&ctx); |
80 | EVP_DigestInit (&ctx, RSA_HASH); |
133 | require (EVP_DigestInit (&ctx, RSA_HASH)); |
81 | EVP_DigestUpdate(&ctx, &chg, sizeof chg); |
134 | require (EVP_DigestUpdate(&ctx, &chg, sizeof chg)); |
82 | EVP_DigestUpdate(&ctx, &id, sizeof id); |
135 | require (EVP_DigestUpdate(&ctx, &id, sizeof id)); |
83 | 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 (time_watcher &w); time_watcher 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 > 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; |
107 | } |
161 | } |
108 | } |
162 | } |
109 | |
163 | |
110 | if (cleaner.at < NOW) |
164 | if (!cleaner.is_active ()) |
111 | cleaner.start (NOW + RSA_TTL); |
165 | cleaner.again (); |
112 | |
166 | |
113 | return false; |
167 | return false; |
114 | } |
168 | } |
115 | |
169 | |
116 | void gen (rsaid &id, rsachallenge &chg) |
170 | void gen (rsaid &id, rsachallenge &chg) |
117 | { |
171 | { |
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 = 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.at < NOW) |
183 | if (!cleaner.is_active ()) |
130 | cleaner.start (NOW + RSA_TTL); |
184 | cleaner.again (); |
131 | } |
185 | } |
132 | |
186 | |
133 | rsa_cache () |
187 | rsa_cache () |
134 | : cleaner (this, &rsa_cache::cleaner_cb) |
188 | { |
135 | { } |
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 | } |
136 | |
192 | |
137 | } rsa_cache; |
193 | } rsa_cache; |
138 | |
194 | |
139 | void rsa_cache::cleaner_cb (time_watcher &w) |
195 | void rsa_cache::cleaner_cb (ev::timer &w, int revents) |
140 | { |
196 | { |
141 | if (!empty ()) |
197 | if (empty ()) |
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198 | w.stop (); |
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199 | else |
142 | { |
200 | { |
143 | w.start (NOW + RSA_TTL); |
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144 | |
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145 | for (iterator i = begin (); i != end (); ) |
201 | for (iterator i = begin (); i != end (); ) |
146 | if (i->expire <= NOW) |
202 | if (i->expire <= ev_now ()) |
147 | i = erase (i); |
203 | i = erase (i); |
148 | else |
204 | else |
149 | ++i; |
205 | ++i; |
150 | } |
206 | } |
151 | } |
207 | } |
152 | |
208 | |
153 | ////////////////////////////////////////////////////////////////////////////// |
209 | ////////////////////////////////////////////////////////////////////////////// |
154 | |
210 | |
155 | 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) |
156 | { |
213 | { |
157 | if (queue[i]) |
214 | queue = new pkt [max_queue]; |
158 | { |
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159 | delete queue[i]; |
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160 | j = (j + 1) % QUEUEDEPTH; |
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161 | } |
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162 | |
215 | |
163 | queue[i] = p; |
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164 | |
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165 | i = (i + 1) % QUEUEDEPTH; |
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166 | } |
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167 | |
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168 | net_packet *pkt_queue::get () |
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169 | { |
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170 | net_packet *p = queue[j]; |
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171 | |
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172 | if (p) |
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173 | { |
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174 | queue[j] = 0; |
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175 | j = (j + 1) % QUEUEDEPTH; |
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176 | } |
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177 | |
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178 | return p; |
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179 | } |
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180 | |
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181 | pkt_queue::pkt_queue () |
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182 | { |
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183 | memset (queue, 0, sizeof (queue)); |
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184 | i = 0; |
216 | i = 0; |
185 | j = 0; |
217 | j = 0; |
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218 | |
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219 | expire.set<pkt_queue, &pkt_queue::expire_cb> (this); |
186 | } |
220 | } |
187 | |
221 | |
188 | pkt_queue::~pkt_queue () |
222 | pkt_queue::~pkt_queue () |
189 | { |
223 | { |
190 | for (i = QUEUEDEPTH; --i > 0; ) |
224 | while (net_packet *p = get ()) |
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225 | delete p; |
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226 | |
191 | delete queue[i]; |
227 | delete [] queue; |
192 | } |
228 | } |
193 | |
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 | |
194 | struct net_rateinfo { |
283 | struct net_rateinfo |
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284 | { |
195 | u32 host; |
285 | u32 host; |
196 | double pcnt, diff; |
286 | double pcnt, diff; |
197 | tstamp last; |
287 | tstamp last; |
198 | }; |
288 | }; |
199 | |
289 | |
200 | // only do action once every x seconds per host whole allowing bursts. |
290 | // only do action once every x seconds per host whole allowing bursts. |
201 | // this implementation ("splay list" ;) is inefficient, |
291 | // this implementation ("splay list" ;) is inefficient, |
202 | // but low on resources. |
292 | // but low on resources. |
203 | struct net_rate_limiter : list<net_rateinfo> |
293 | struct net_rate_limiter : list<net_rateinfo> |
204 | { |
294 | { |
205 | static const double ALPHA = 1. - 1. / 600.; // allow bursts |
295 | # define NRL_ALPHA (1. - 1. / 600.) // allow bursts |
206 | static const double CUTOFF = 10.; // one event every CUTOFF seconds |
296 | # define NRL_CUTOFF 10. // one event every CUTOFF seconds |
207 | static const double EXPIRE = CUTOFF * 30.; // expire entries after this time |
297 | # define NRL_EXPIRE (NRL_CUTOFF * 30.) // expire entries after this time |
208 | static const double MAXDIF = CUTOFF * (1. / (1. - ALPHA)); // maximum diff /count value |
298 | # define NRL_MAXDIF (NRL_CUTOFF * (1. / (1. - NRL_ALPHA))) // maximum diff /count value |
209 | |
299 | |
210 | bool can (const sockinfo &si) { return can((u32)si.host); } |
300 | bool can (const sockinfo &si) { return can((u32)si.host); } |
211 | bool can (u32 host); |
301 | bool can (u32 host); |
212 | }; |
302 | }; |
213 | |
303 | |
… | |
… | |
218 | iterator i; |
308 | iterator i; |
219 | |
309 | |
220 | for (i = begin (); i != end (); ) |
310 | for (i = begin (); i != end (); ) |
221 | if (i->host == host) |
311 | if (i->host == host) |
222 | break; |
312 | break; |
223 | else if (i->last < NOW - EXPIRE) |
313 | else if (i->last < ev_now () - NRL_EXPIRE) |
224 | i = erase (i); |
314 | i = erase (i); |
225 | else |
315 | else |
226 | i++; |
316 | i++; |
227 | |
317 | |
228 | if (i == end ()) |
318 | if (i == end ()) |
229 | { |
319 | { |
230 | net_rateinfo ri; |
320 | net_rateinfo ri; |
231 | |
321 | |
232 | ri.host = host; |
322 | ri.host = host; |
233 | ri.pcnt = 1.; |
323 | ri.pcnt = 1.; |
234 | ri.diff = MAXDIF; |
324 | ri.diff = NRL_MAXDIF; |
235 | ri.last = NOW; |
325 | ri.last = ev_now (); |
236 | |
326 | |
237 | push_front (ri); |
327 | push_front (ri); |
238 | |
328 | |
239 | return true; |
329 | return true; |
240 | } |
330 | } |
241 | else |
331 | else |
242 | { |
332 | { |
243 | net_rateinfo ri (*i); |
333 | net_rateinfo ri (*i); |
244 | erase (i); |
334 | erase (i); |
245 | |
335 | |
246 | ri.pcnt = ri.pcnt * ALPHA; |
336 | ri.pcnt = ri.pcnt * NRL_ALPHA; |
247 | ri.diff = ri.diff * ALPHA + (NOW - ri.last); |
337 | ri.diff = ri.diff * NRL_ALPHA + (ev_now () - ri.last); |
248 | |
338 | |
249 | ri.last = NOW; |
339 | ri.last = ev_now (); |
250 | |
340 | |
251 | double dif = ri.diff / ri.pcnt; |
341 | double dif = ri.diff / ri.pcnt; |
252 | |
342 | |
253 | bool send = dif > CUTOFF; |
343 | bool send = dif > NRL_CUTOFF; |
254 | |
344 | |
255 | if (dif > MAXDIF) |
345 | if (dif > NRL_MAXDIF) |
256 | { |
346 | { |
257 | ri.pcnt = 1.; |
347 | ri.pcnt = 1.; |
258 | ri.diff = MAXDIF; |
348 | ri.diff = NRL_MAXDIF; |
259 | } |
349 | } |
260 | else if (send) |
350 | else if (send) |
261 | ri.pcnt++; |
351 | ri.pcnt++; |
262 | |
352 | |
263 | push_front (ri); |
353 | push_front (ri); |
… | |
… | |
310 | } |
400 | } |
311 | |
401 | |
312 | #define MAXVPNDATA (MAX_MTU - 6 - 6) |
402 | #define MAXVPNDATA (MAX_MTU - 6 - 6) |
313 | #define DATAHDR (sizeof (u32) + RAND_SIZE) |
403 | #define DATAHDR (sizeof (u32) + RAND_SIZE) |
314 | |
404 | |
315 | struct vpndata_packet:vpn_packet |
405 | struct vpndata_packet : vpn_packet |
316 | { |
406 | { |
317 | u8 data[MAXVPNDATA + DATAHDR]; // seqno |
407 | u8 data[MAXVPNDATA + DATAHDR]; // seqno |
318 | |
408 | |
319 | void setup (connection *conn, int dst, u8 *d, u32 len, u32 seqno); |
409 | void setup (connection *conn, int dst, u8 *d, u32 len, u32 seqno); |
320 | tap_packet *unpack (connection *conn, u32 &seqno); |
410 | tap_packet *unpack (connection *conn, u32 &seqno); |
… | |
… | |
333 | int outl = 0, outl2; |
423 | int outl = 0, outl2; |
334 | ptype type = PT_DATA_UNCOMPRESSED; |
424 | ptype type = PT_DATA_UNCOMPRESSED; |
335 | |
425 | |
336 | #if ENABLE_COMPRESSION |
426 | #if ENABLE_COMPRESSION |
337 | u8 cdata[MAX_MTU]; |
427 | u8 cdata[MAX_MTU]; |
338 | u32 cl; |
|
|
339 | |
428 | |
|
|
429 | if (conn->features & ENABLE_COMPRESSION) |
|
|
430 | { |
340 | cl = lzf_compress (d, l, cdata + 2, (l - 2) & ~7); |
431 | u32 cl = lzf_compress (d, l, cdata + 2, (l - 2) & ~7); |
|
|
432 | |
341 | if (cl) |
433 | if (cl) |
342 | { |
434 | { |
343 | type = PT_DATA_COMPRESSED; |
435 | type = PT_DATA_COMPRESSED; |
344 | d = cdata; |
436 | d = cdata; |
345 | l = cl + 2; |
437 | l = cl + 2; |
346 | |
438 | |
347 | d[0] = cl >> 8; |
439 | d[0] = cl >> 8; |
348 | d[1] = cl; |
440 | d[1] = cl; |
|
|
441 | } |
349 | } |
442 | } |
350 | #endif |
443 | #endif |
351 | |
444 | |
352 | EVP_EncryptInit_ex (cctx, 0, 0, 0, 0); |
445 | require (EVP_EncryptInit_ex (cctx, 0, 0, 0, 0)); |
353 | |
446 | |
354 | struct { |
447 | struct { |
355 | #if RAND_SIZE |
448 | #if RAND_SIZE |
356 | u8 rnd[RAND_SIZE]; |
449 | u8 rnd[RAND_SIZE]; |
357 | #endif |
450 | #endif |
… | |
… | |
361 | datahdr.seqno = ntohl (seqno); |
454 | datahdr.seqno = ntohl (seqno); |
362 | #if RAND_SIZE |
455 | #if RAND_SIZE |
363 | RAND_pseudo_bytes ((unsigned char *) datahdr.rnd, RAND_SIZE); |
456 | RAND_pseudo_bytes ((unsigned char *) datahdr.rnd, RAND_SIZE); |
364 | #endif |
457 | #endif |
365 | |
458 | |
366 | EVP_EncryptUpdate (cctx, |
459 | require (EVP_EncryptUpdate (cctx, |
367 | (unsigned char *) data + outl, &outl2, |
460 | (unsigned char *) data + outl, &outl2, |
368 | (unsigned char *) &datahdr, DATAHDR); |
461 | (unsigned char *) &datahdr, DATAHDR)); |
369 | outl += outl2; |
462 | outl += outl2; |
370 | |
463 | |
371 | EVP_EncryptUpdate (cctx, |
464 | require (EVP_EncryptUpdate (cctx, |
372 | (unsigned char *) data + outl, &outl2, |
465 | (unsigned char *) data + outl, &outl2, |
373 | (unsigned char *) d, l); |
466 | (unsigned char *) d, l)); |
374 | outl += outl2; |
467 | outl += outl2; |
375 | |
468 | |
376 | EVP_EncryptFinal_ex (cctx, (unsigned char *) data + outl, &outl2); |
469 | require (EVP_EncryptFinal_ex (cctx, (unsigned char *) data + outl, &outl2)); |
377 | outl += outl2; |
470 | outl += outl2; |
378 | |
471 | |
379 | len = outl + data_hdr_size (); |
472 | len = outl + data_hdr_size (); |
380 | |
473 | |
381 | set_hdr (type, dst); |
474 | set_hdr (type, dst); |
… | |
… | |
390 | int outl = 0, outl2; |
483 | int outl = 0, outl2; |
391 | tap_packet *p = new tap_packet; |
484 | tap_packet *p = new tap_packet; |
392 | u8 *d; |
485 | u8 *d; |
393 | u32 l = len - data_hdr_size (); |
486 | u32 l = len - data_hdr_size (); |
394 | |
487 | |
395 | EVP_DecryptInit_ex (cctx, 0, 0, 0, 0); |
488 | require (EVP_DecryptInit_ex (cctx, 0, 0, 0, 0)); |
396 | |
489 | |
397 | #if ENABLE_COMPRESSION |
490 | #if ENABLE_COMPRESSION |
398 | u8 cdata[MAX_MTU]; |
491 | u8 cdata[MAX_MTU]; |
399 | |
492 | |
400 | if (type == PT_DATA_COMPRESSED) |
493 | if (type == PT_DATA_COMPRESSED) |
… | |
… | |
402 | else |
495 | else |
403 | #endif |
496 | #endif |
404 | d = &(*p)[6 + 6 - DATAHDR]; |
497 | d = &(*p)[6 + 6 - DATAHDR]; |
405 | |
498 | |
406 | /* this overwrites part of the src mac, but we fix that later */ |
499 | /* this overwrites part of the src mac, but we fix that later */ |
407 | EVP_DecryptUpdate (cctx, |
500 | require (EVP_DecryptUpdate (cctx, |
408 | d, &outl2, |
501 | d, &outl2, |
409 | (unsigned char *)&data, len - data_hdr_size ()); |
502 | (unsigned char *)&data, len - data_hdr_size ())); |
410 | outl += outl2; |
503 | outl += outl2; |
411 | |
504 | |
412 | EVP_DecryptFinal_ex (cctx, (unsigned char *)d + outl, &outl2); |
505 | require (EVP_DecryptFinal_ex (cctx, (unsigned char *)d + outl, &outl2)); |
413 | outl += outl2; |
506 | outl += outl2; |
414 | |
507 | |
415 | seqno = ntohl (*(u32 *)(d + RAND_SIZE)); |
508 | seqno = ntohl (*(u32 *)(d + RAND_SIZE)); |
416 | |
509 | |
417 | id2mac (dst () ? dst() : THISNODE->id, p->dst); |
510 | id2mac (dst () ? dst() : THISNODE->id, p->dst); |
… | |
… | |
446 | { |
539 | { |
447 | // actually, hmaclen cannot be checked because the hmac |
540 | // actually, hmaclen cannot be checked because the hmac |
448 | // field comes before this data, so peers with other |
541 | // field comes before this data, so peers with other |
449 | // hmacs simply will not work. |
542 | // hmacs simply will not work. |
450 | u8 prot_major, prot_minor, randsize, hmaclen; |
543 | u8 prot_major, prot_minor, randsize, hmaclen; |
451 | u8 flags, challengelen, pad2, pad3; |
544 | u8 flags, challengelen, features, pad3; |
452 | u32 cipher_nid, digest_nid, hmac_nid; |
545 | u32 cipher_nid, digest_nid, hmac_nid; |
453 | |
|
|
454 | const u8 curflags () const |
|
|
455 | { |
|
|
456 | return 0x80 |
|
|
457 | | (ENABLE_COMPRESSION ? 0x01 : 0x00); |
|
|
458 | } |
|
|
459 | |
546 | |
460 | void setup (ptype type, int dst); |
547 | void setup (ptype type, int dst); |
461 | bool chk_config () const; |
548 | bool chk_config () const; |
|
|
549 | |
|
|
550 | static u8 get_features () |
|
|
551 | { |
|
|
552 | u8 f = 0; |
|
|
553 | #if ENABLE_COMPRESSION |
|
|
554 | f |= FEATURE_COMPRESSION; |
|
|
555 | #endif |
|
|
556 | #if ENABLE_ROHC |
|
|
557 | f |= FEATURE_ROHC; |
|
|
558 | #endif |
|
|
559 | #if ENABLE_BRIDGING |
|
|
560 | f |= FEATURE_BRIDGING; |
|
|
561 | #endif |
|
|
562 | return f; |
|
|
563 | } |
462 | }; |
564 | }; |
463 | |
565 | |
464 | void config_packet::setup (ptype type, int dst) |
566 | void config_packet::setup (ptype type, int dst) |
465 | { |
567 | { |
466 | prot_major = PROTOCOL_MAJOR; |
568 | prot_major = PROTOCOL_MAJOR; |
467 | prot_minor = PROTOCOL_MINOR; |
569 | prot_minor = PROTOCOL_MINOR; |
468 | randsize = RAND_SIZE; |
570 | randsize = RAND_SIZE; |
469 | hmaclen = HMACLENGTH; |
571 | hmaclen = HMACLENGTH; |
470 | flags = curflags (); |
572 | flags = 0; |
471 | challengelen = sizeof (rsachallenge); |
573 | challengelen = sizeof (rsachallenge); |
|
|
574 | features = get_features (); |
472 | |
575 | |
473 | cipher_nid = htonl (EVP_CIPHER_nid (CIPHER)); |
576 | cipher_nid = htonl (EVP_CIPHER_nid (CIPHER)); |
474 | digest_nid = htonl (EVP_MD_type (RSA_HASH)); |
577 | digest_nid = htonl (EVP_MD_type (RSA_HASH)); |
475 | hmac_nid = htonl (EVP_MD_type (DIGEST)); |
578 | hmac_nid = htonl (EVP_MD_type (DIGEST)); |
476 | |
579 | |
… | |
… | |
484 | slog (L_WARN, _("major version mismatch (remote %d <=> local %d)"), prot_major, PROTOCOL_MAJOR); |
587 | slog (L_WARN, _("major version mismatch (remote %d <=> local %d)"), prot_major, PROTOCOL_MAJOR); |
485 | else if (randsize != RAND_SIZE) |
588 | else if (randsize != RAND_SIZE) |
486 | slog (L_WARN, _("rand size mismatch (remote %d <=> local %d)"), randsize, RAND_SIZE); |
589 | slog (L_WARN, _("rand size mismatch (remote %d <=> local %d)"), randsize, RAND_SIZE); |
487 | else if (hmaclen != HMACLENGTH) |
590 | else if (hmaclen != HMACLENGTH) |
488 | slog (L_WARN, _("hmac length mismatch (remote %d <=> local %d)"), hmaclen, HMACLENGTH); |
591 | slog (L_WARN, _("hmac length mismatch (remote %d <=> local %d)"), hmaclen, HMACLENGTH); |
489 | else if (flags != curflags ()) |
|
|
490 | slog (L_WARN, _("flag mismatch (remote %x <=> local %x)"), flags, curflags ()); |
|
|
491 | else if (challengelen != sizeof (rsachallenge)) |
592 | else if (challengelen != sizeof (rsachallenge)) |
492 | slog (L_WARN, _("challenge length mismatch (remote %d <=> local %d)"), challengelen, sizeof (rsachallenge)); |
593 | slog (L_WARN, _("challenge length mismatch (remote %d <=> local %d)"), challengelen, sizeof (rsachallenge)); |
493 | else if (cipher_nid != htonl (EVP_CIPHER_nid (CIPHER))) |
594 | else if (cipher_nid != htonl (EVP_CIPHER_nid (CIPHER))) |
494 | slog (L_WARN, _("cipher mismatch (remote %x <=> local %x)"), ntohl (cipher_nid), EVP_CIPHER_nid (CIPHER)); |
595 | slog (L_WARN, _("cipher mismatch (remote %x <=> local %x)"), ntohl (cipher_nid), EVP_CIPHER_nid (CIPHER)); |
495 | else if (digest_nid != htonl (EVP_MD_type (RSA_HASH))) |
596 | else if (digest_nid != htonl (EVP_MD_type (RSA_HASH))) |
… | |
… | |
504 | |
605 | |
505 | struct auth_req_packet : config_packet |
606 | struct auth_req_packet : config_packet |
506 | { |
607 | { |
507 | char magic[8]; |
608 | char magic[8]; |
508 | u8 initiate; // false if this is just an automatic reply |
609 | u8 initiate; // false if this is just an automatic reply |
509 | u8 protocols; // supported protocols (will get patches on forward) |
610 | u8 protocols; // supported protocols (will be patched on forward) |
510 | u8 pad2, pad3; |
611 | u8 pad2, pad3; |
511 | rsaid id; |
612 | rsaid id; |
512 | rsaencrdata encr; |
613 | rsaencrdata encr; |
513 | |
614 | |
514 | auth_req_packet (int dst, bool initiate_, u8 protocols_) |
615 | auth_req_packet (int dst, bool initiate_, u8 protocols_) |
… | |
… | |
571 | ///////////////////////////////////////////////////////////////////////////// |
672 | ///////////////////////////////////////////////////////////////////////////// |
572 | |
673 | |
573 | void |
674 | void |
574 | connection::connection_established () |
675 | connection::connection_established () |
575 | { |
676 | { |
|
|
677 | slog (L_TRACE, _("%s: possible connection establish (ictx %d, octx %d)"), conf->nodename, !!ictx, !!octx); |
|
|
678 | |
576 | if (ictx && octx) |
679 | if (ictx && octx) |
577 | { |
680 | { |
578 | connectmode = conf->connectmode; |
681 | // make sure rekeying timeouts are slightly asymmetric |
579 | |
682 | ev::tstamp rekey_interval = ::conf.rekey + (conf->id > THISNODE->id ? 10 : 0); |
580 | rekey.start (NOW + ::conf.rekey); |
683 | rekey.start (rekey_interval, rekey_interval); |
581 | keepalive.start (NOW + ::conf.keepalive); |
684 | keepalive.start (::conf.keepalive); |
582 | |
685 | |
583 | // send queued packets |
686 | // send queued packets |
584 | if (ictx && octx) |
687 | if (ictx && octx) |
585 | { |
688 | { |
586 | while (tap_packet *p = (tap_packet *)data_queue.get ()) |
689 | while (tap_packet *p = (tap_packet *)data_queue.get ()) |
587 | { |
690 | { |
588 | send_data_packet (p); |
691 | if (p->len) send_data_packet (p); |
589 | delete p; |
692 | delete p; |
590 | } |
693 | } |
591 | |
694 | |
592 | while (vpn_packet *p = (vpn_packet *)vpn_queue.get ()) |
695 | while (vpn_packet *p = (vpn_packet *)vpn_queue.get ()) |
593 | { |
696 | { |
594 | send_vpn_packet (p, si, IPTOS_RELIABILITY); |
697 | if (p->len) send_vpn_packet (p, si, IPTOS_RELIABILITY); |
595 | delete p; |
698 | delete p; |
596 | } |
699 | } |
597 | } |
700 | } |
598 | } |
701 | } |
599 | else |
702 | else |
600 | { |
703 | { |
601 | retry_cnt = 0; |
704 | retry_cnt = 0; |
602 | establish_connection.start (NOW + 5); |
705 | establish_connection.start (5); |
603 | keepalive.stop (); |
706 | keepalive.stop (); |
604 | rekey.stop (); |
707 | rekey.stop (); |
605 | } |
708 | } |
606 | } |
709 | } |
607 | |
710 | |
… | |
… | |
611 | protocol = best_protocol (THISNODE->protocols & conf->protocols); |
714 | protocol = best_protocol (THISNODE->protocols & conf->protocols); |
612 | |
715 | |
613 | // mask out protocols we cannot establish |
716 | // mask out protocols we cannot establish |
614 | if (!conf->udp_port) protocol &= ~PROT_UDPv4; |
717 | if (!conf->udp_port) protocol &= ~PROT_UDPv4; |
615 | if (!conf->tcp_port) protocol &= ~PROT_TCPv4; |
718 | if (!conf->tcp_port) protocol &= ~PROT_TCPv4; |
|
|
719 | if (!conf->dns_port) protocol &= ~PROT_DNSv4; |
|
|
720 | |
|
|
721 | if (protocol |
|
|
722 | && (!conf->can_direct (THISNODE) |
|
|
723 | || !THISNODE->can_direct (conf))) |
|
|
724 | { |
|
|
725 | slog (L_DEBUG, _("%s: direct connection denied"), conf->nodename); |
|
|
726 | protocol = 0; |
|
|
727 | } |
616 | |
728 | |
617 | si.set (conf, protocol); |
729 | si.set (conf, protocol); |
618 | } |
730 | } |
619 | |
731 | |
620 | // ensure sockinfo is valid, forward if necessary |
732 | // ensure sockinfo is valid, forward if necessary |
… | |
… | |
625 | { |
737 | { |
626 | connection *r = vpn->find_router (); |
738 | connection *r = vpn->find_router (); |
627 | |
739 | |
628 | if (r) |
740 | if (r) |
629 | { |
741 | { |
630 | slog (L_DEBUG, _("%s: no common protocol, trying indirectly through %s"), |
742 | slog (L_DEBUG, _("%s: no common protocol, trying indirectly through %s (%s)"), |
631 | conf->nodename, r->conf->nodename); |
743 | conf->nodename, r->conf->nodename, (const char *)r->si); |
632 | return r->si; |
744 | return r->si; |
633 | } |
745 | } |
634 | else |
746 | else |
635 | slog (L_DEBUG, _("%s: node unreachable, no common protocol"), |
747 | slog (L_DEBUG, _("%s: node unreachable, no common protocol"), |
636 | conf->nodename); |
748 | conf->nodename); |
… | |
… | |
706 | } |
818 | } |
707 | |
819 | |
708 | void |
820 | void |
709 | connection::send_connect_info (int rid, const sockinfo &rsi, u8 rprotocols) |
821 | connection::send_connect_info (int rid, const sockinfo &rsi, u8 rprotocols) |
710 | { |
822 | { |
711 | slog (L_TRACE, ">>%d PT_CONNECT_INFO(%d,%s)\n", |
823 | slog (L_TRACE, ">>%d PT_CONNECT_INFO(%d,%s)", |
712 | conf->id, rid, (const char *)rsi); |
824 | conf->id, rid, (const char *)rsi); |
713 | |
825 | |
714 | 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); |
715 | |
827 | |
716 | r->hmac_set (octx); |
828 | r->hmac_set (octx); |
717 | send_vpn_packet (r, si); |
829 | send_vpn_packet (r, si); |
718 | |
830 | |
719 | delete r; |
831 | delete r; |
720 | } |
832 | } |
721 | |
833 | |
722 | void |
834 | inline void |
723 | connection::establish_connection_cb (time_watcher &w) |
835 | connection::establish_connection_cb (ev::timer &w, int revents) |
724 | { |
836 | { |
725 | if (!ictx |
837 | if (!ictx |
726 | && conf != THISNODE |
838 | && conf != THISNODE |
727 | && connectmode != conf_node::C_NEVER |
839 | && connectmode != conf_node::C_NEVER |
728 | && connectmode != conf_node::C_DISABLED |
840 | && connectmode != conf_node::C_DISABLED |
729 | && NOW > w.at) |
841 | && !w.is_active ()) |
730 | { |
842 | { |
731 | double retry_int = double (retry_cnt & 3 ? (retry_cnt & 3) : 1 << (retry_cnt >> 2)) * 0.6; |
843 | // a bit hacky, if ondemand, and packets are no longer queued, then reset the connection |
732 | |
844 | // and stop trying. should probably be handled by a per-connection expire handler. |
733 | if (retry_int < 3600 * 8) |
845 | if (connectmode == conf_node::C_ONDEMAND && vpn_queue.empty () && data_queue.empty ()) |
|
|
846 | { |
|
|
847 | reset_connection (); |
734 | retry_cnt++; |
848 | return; |
|
|
849 | } |
735 | |
850 | |
736 | w.start (NOW + retry_int); |
851 | last_establish_attempt = ev_now (); |
|
|
852 | |
|
|
853 | ev::tstamp retry_int = ev::tstamp (retry_cnt & 3 |
|
|
854 | ? (retry_cnt & 3) + 1 |
|
|
855 | : 1 << (retry_cnt >> 2)); |
737 | |
856 | |
738 | reset_si (); |
857 | reset_si (); |
739 | |
858 | |
|
|
859 | bool slow = si.prot & PROT_SLOW; |
|
|
860 | |
740 | if (si.prot && !si.host) |
861 | if (si.prot && !si.host) |
|
|
862 | { |
|
|
863 | slog (L_TRACE, _("%s: connection request (indirect)"), conf->nodename); |
|
|
864 | /*TODO*/ /* start the timer so we don't recurse endlessly */ |
|
|
865 | w.start (1); |
741 | vpn->send_connect_request (conf->id); |
866 | vpn->send_connect_request (conf->id); |
|
|
867 | } |
742 | else |
868 | else |
743 | { |
869 | { |
|
|
870 | slog (L_TRACE, _("%s: connection request (direct)"), conf->nodename, !!ictx, !!octx); |
|
|
871 | |
744 | const sockinfo &dsi = forward_si (si); |
872 | const sockinfo &dsi = forward_si (si); |
|
|
873 | |
|
|
874 | slow = slow || (dsi.prot & PROT_SLOW); |
745 | |
875 | |
746 | if (dsi.valid () && auth_rate_limiter.can (dsi)) |
876 | if (dsi.valid () && auth_rate_limiter.can (dsi)) |
747 | { |
877 | { |
748 | if (retry_cnt < 4) |
878 | if (retry_cnt < 4) |
749 | send_auth_request (dsi, true); |
879 | send_auth_request (dsi, true); |
750 | else |
880 | else |
751 | send_ping (dsi, 0); |
881 | send_ping (dsi, 0); |
752 | } |
882 | } |
753 | } |
883 | } |
|
|
884 | |
|
|
885 | retry_int *= slow ? 8. : 0.9; |
|
|
886 | |
|
|
887 | if (retry_int < conf->max_retry) |
|
|
888 | retry_cnt++; |
|
|
889 | else |
|
|
890 | retry_int = conf->max_retry; |
|
|
891 | |
|
|
892 | w.start (retry_int); |
754 | } |
893 | } |
755 | } |
894 | } |
756 | |
895 | |
757 | void |
896 | void |
758 | connection::reset_connection () |
897 | connection::reset_connection () |
… | |
… | |
761 | { |
900 | { |
762 | slog (L_INFO, _("%s(%s): connection lost"), |
901 | slog (L_INFO, _("%s(%s): connection lost"), |
763 | conf->nodename, (const char *)si); |
902 | conf->nodename, (const char *)si); |
764 | |
903 | |
765 | if (::conf.script_node_down) |
904 | if (::conf.script_node_down) |
766 | run_script (run_script_cb (this, &connection::script_node_down), false); |
905 | { |
|
|
906 | run_script_cb *cb = new run_script_cb; |
|
|
907 | cb->set<connection, &connection::script_node_down> (this); |
|
|
908 | run_script_queued (cb, _("node-down command execution failed, continuing.")); |
|
|
909 | } |
767 | } |
910 | } |
768 | |
911 | |
769 | delete ictx; ictx = 0; |
912 | delete ictx; ictx = 0; |
770 | delete octx; octx = 0; |
913 | delete octx; octx = 0; |
|
|
914 | #if ENABLE_DNS |
|
|
915 | dnsv4_reset_connection (); |
|
|
916 | #endif |
771 | |
917 | |
772 | si.host= 0; |
918 | si.host = 0; |
773 | |
919 | |
774 | last_activity = 0; |
920 | last_activity = 0; |
775 | retry_cnt = 0; |
921 | retry_cnt = 0; |
776 | |
922 | |
777 | rekey.stop (); |
923 | rekey.stop (); |
… | |
… | |
786 | send_reset (si); |
932 | send_reset (si); |
787 | |
933 | |
788 | reset_connection (); |
934 | reset_connection (); |
789 | } |
935 | } |
790 | |
936 | |
791 | void |
937 | inline void |
792 | connection::rekey_cb (time_watcher &w) |
938 | connection::rekey_cb (ev::timer &w, int revents) |
793 | { |
939 | { |
794 | reset_connection (); |
940 | reset_connection (); |
795 | establish_connection (); |
941 | establish_connection (); |
796 | } |
942 | } |
797 | |
943 | |
… | |
… | |
813 | if (oseqno > MAX_SEQNO) |
959 | if (oseqno > MAX_SEQNO) |
814 | rekey (); |
960 | rekey (); |
815 | } |
961 | } |
816 | |
962 | |
817 | void |
963 | void |
|
|
964 | connection::post_inject_queue () |
|
|
965 | { |
|
|
966 | // force a connection every now and when when packets are sent (max 1/s) |
|
|
967 | if (ev_now () - last_establish_attempt >= 0.95) // arbitrary |
|
|
968 | establish_connection.stop (); |
|
|
969 | |
|
|
970 | establish_connection (); |
|
|
971 | } |
|
|
972 | |
|
|
973 | void |
818 | connection::inject_data_packet (tap_packet *pkt, bool broadcast/*TODO DDD*/) |
974 | connection::inject_data_packet (tap_packet *pkt) |
819 | { |
975 | { |
820 | if (ictx && octx) |
976 | if (ictx && octx) |
821 | send_data_packet (pkt); |
977 | send_data_packet (pkt); |
822 | else |
978 | else |
823 | { |
979 | { |
824 | if (!broadcast)//DDDD |
|
|
825 | data_queue.put (new tap_packet (*pkt)); |
980 | data_queue.put (new tap_packet (*pkt)); |
826 | |
981 | post_inject_queue (); |
827 | establish_connection (); |
|
|
828 | } |
982 | } |
829 | } |
983 | } |
830 | |
984 | |
831 | void connection::inject_vpn_packet (vpn_packet *pkt, int tos) |
985 | void connection::inject_vpn_packet (vpn_packet *pkt, int tos) |
832 | { |
986 | { |
833 | if (ictx && octx) |
987 | if (ictx && octx) |
834 | send_vpn_packet (pkt, si, tos); |
988 | send_vpn_packet (pkt, si, tos); |
835 | else |
989 | else |
836 | { |
990 | { |
837 | vpn_queue.put (new vpn_packet (*pkt)); |
991 | vpn_queue.put ((vpn_packet *)new data_packet (*(data_packet *)pkt)); |
838 | |
992 | post_inject_queue (); |
839 | establish_connection (); |
|
|
840 | } |
993 | } |
841 | } |
994 | } |
842 | |
995 | |
843 | void |
996 | void |
844 | connection::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi) |
997 | connection::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi) |
845 | { |
998 | { |
846 | last_activity = NOW; |
999 | last_activity = ev_now (); |
847 | |
1000 | |
848 | slog (L_NOISE, "<<%d received packet type %d from %d to %d", |
1001 | slog (L_NOISE, "<<%d received packet type %d from %d to %d", |
849 | conf->id, pkt->typ (), pkt->src (), pkt->dst ()); |
1002 | conf->id, pkt->typ (), pkt->src (), pkt->dst ()); |
|
|
1003 | |
|
|
1004 | if (connectmode == conf_node::C_DISABLED) |
|
|
1005 | return; |
850 | |
1006 | |
851 | switch (pkt->typ ()) |
1007 | switch (pkt->typ ()) |
852 | { |
1008 | { |
853 | case vpn_packet::PT_PING: |
1009 | case vpn_packet::PT_PING: |
854 | // we send pings instead of auth packets after some retries, |
1010 | // we send pings instead of auth packets after some retries, |
… | |
… | |
915 | |
1071 | |
916 | octx = new crypto_ctx (k, 1); |
1072 | octx = new crypto_ctx (k, 1); |
917 | oseqno = ntohl (*(u32 *)&k[CHG_SEQNO]) & 0x7fffffff; |
1073 | oseqno = ntohl (*(u32 *)&k[CHG_SEQNO]) & 0x7fffffff; |
918 | |
1074 | |
919 | conf->protocols = p->protocols; |
1075 | conf->protocols = p->protocols; |
|
|
1076 | features = p->features & config_packet::get_features (); |
920 | |
1077 | |
921 | send_auth_response (rsi, p->id, k); |
1078 | send_auth_response (rsi, p->id, k); |
922 | |
1079 | |
923 | connection_established (); |
1080 | connection_established (); |
924 | |
1081 | |
… | |
… | |
960 | crypto_ctx *cctx = new crypto_ctx (chg, 0); |
1117 | crypto_ctx *cctx = new crypto_ctx (chg, 0); |
961 | |
1118 | |
962 | if (!p->hmac_chk (cctx)) |
1119 | if (!p->hmac_chk (cctx)) |
963 | { |
1120 | { |
964 | slog (L_ERR, _("%s(%s): hmac authentication error on auth response, received invalid packet\n" |
1121 | slog (L_ERR, _("%s(%s): hmac authentication error on auth response, received invalid packet\n" |
965 | "could be an attack, or just corruption or an synchronization error"), |
1122 | "could be an attack, or just corruption or a synchronization error"), |
966 | conf->nodename, (const char *)rsi); |
1123 | conf->nodename, (const char *)rsi); |
967 | break; |
1124 | break; |
968 | } |
1125 | } |
969 | else |
1126 | else |
970 | { |
1127 | { |
… | |
… | |
988 | slog (L_INFO, _("%s(%s): connection established, protocol version %d.%d"), |
1145 | slog (L_INFO, _("%s(%s): connection established, protocol version %d.%d"), |
989 | conf->nodename, (const char *)rsi, |
1146 | conf->nodename, (const char *)rsi, |
990 | p->prot_major, p->prot_minor); |
1147 | p->prot_major, p->prot_minor); |
991 | |
1148 | |
992 | if (::conf.script_node_up) |
1149 | if (::conf.script_node_up) |
993 | run_script (run_script_cb (this, &connection::script_node_up), false); |
1150 | { |
|
|
1151 | run_script_cb *cb = new run_script_cb; |
|
|
1152 | cb->set<connection, &connection::script_node_up> (this); |
|
|
1153 | run_script_queued (cb, _("node-up command execution failed, continuing.")); |
|
|
1154 | } |
994 | |
1155 | |
995 | break; |
1156 | break; |
996 | } |
1157 | } |
997 | else |
1158 | else |
998 | slog (L_ERR, _("%s(%s): sent and received challenge do not match"), |
1159 | slog (L_ERR, _("%s(%s): sent and received challenge do not match"), |
… | |
… | |
1019 | { |
1180 | { |
1020 | vpndata_packet *p = (vpndata_packet *)pkt; |
1181 | vpndata_packet *p = (vpndata_packet *)pkt; |
1021 | |
1182 | |
1022 | if (!p->hmac_chk (ictx)) |
1183 | if (!p->hmac_chk (ictx)) |
1023 | slog (L_ERR, _("%s(%s): hmac authentication error, received invalid packet\n" |
1184 | slog (L_ERR, _("%s(%s): hmac authentication error, received invalid packet\n" |
1024 | "could be an attack, or just corruption or an synchronization error"), |
1185 | "could be an attack, or just corruption or a synchronization error"), |
1025 | conf->nodename, (const char *)rsi); |
1186 | conf->nodename, (const char *)rsi); |
1026 | else |
1187 | else |
1027 | { |
1188 | { |
1028 | u32 seqno; |
1189 | u32 seqno; |
1029 | tap_packet *d = p->unpack (this, seqno); |
1190 | tap_packet *d = p->unpack (this, seqno); |
… | |
… | |
1032 | { |
1193 | { |
1033 | vpn->tap->send (d); |
1194 | vpn->tap->send (d); |
1034 | |
1195 | |
1035 | if (si != rsi) |
1196 | if (si != rsi) |
1036 | { |
1197 | { |
1037 | // fast re-sync on connection changes, useful especially for tcp/ip |
1198 | // fast re-sync on source address changes, useful especially for tcp/ip |
1038 | si = rsi; |
1199 | si = rsi; |
1039 | |
1200 | |
1040 | slog (L_INFO, _("%s(%s): socket address changed to %s"), |
1201 | slog (L_INFO, _("%s(%s): socket address changed to %s"), |
1041 | conf->nodename, (const char *)si, (const char *)rsi); |
1202 | conf->nodename, (const char *)si, (const char *)rsi); |
1042 | } |
1203 | } |
1043 | |
|
|
1044 | delete d; |
|
|
1045 | |
|
|
1046 | break; |
|
|
1047 | } |
1204 | } |
|
|
1205 | |
|
|
1206 | delete d; |
|
|
1207 | break; |
1048 | } |
1208 | } |
1049 | } |
1209 | } |
1050 | |
1210 | |
1051 | send_reset (rsi); |
1211 | send_reset (rsi); |
1052 | break; |
1212 | break; |
… | |
… | |
1054 | case vpn_packet::PT_CONNECT_REQ: |
1214 | case vpn_packet::PT_CONNECT_REQ: |
1055 | if (ictx && octx && rsi == si && pkt->hmac_chk (ictx)) |
1215 | if (ictx && octx && rsi == si && pkt->hmac_chk (ictx)) |
1056 | { |
1216 | { |
1057 | connect_req_packet *p = (connect_req_packet *) pkt; |
1217 | connect_req_packet *p = (connect_req_packet *) pkt; |
1058 | |
1218 | |
1059 | assert (p->id > 0 && p->id <= vpn->conns.size ()); // hmac-auth does not mean we accept anything |
1219 | if (p->id > 0 && p->id <= vpn->conns.size ()) |
1060 | connection *c = vpn->conns[p->id - 1]; |
|
|
1061 | conf->protocols = p->protocols; |
|
|
1062 | |
|
|
1063 | slog (L_TRACE, "<<%d PT_CONNECT_REQ(%d) [%d]\n", |
|
|
1064 | conf->id, p->id, c->ictx && c->octx); |
|
|
1065 | |
|
|
1066 | if (c->ictx && c->octx) |
|
|
1067 | { |
1220 | { |
|
|
1221 | connection *c = vpn->conns[p->id - 1]; |
|
|
1222 | conf->protocols = p->protocols; |
|
|
1223 | |
|
|
1224 | slog (L_TRACE, "<<%d PT_CONNECT_REQ(%d) [%d]", |
|
|
1225 | conf->id, p->id, c->ictx && c->octx); |
|
|
1226 | |
|
|
1227 | if (c->ictx && c->octx) |
|
|
1228 | { |
1068 | // send connect_info packets to both sides, in case one is |
1229 | // send connect_info packets to both sides, in case one is |
1069 | // behind a nat firewall (or both ;) |
1230 | // behind a nat firewall (or both ;) |
1070 | c->send_connect_info (conf->id, si, conf->protocols); |
1231 | c->send_connect_info (conf->id, si, conf->protocols); |
1071 | send_connect_info (c->conf->id, c->si, c->conf->protocols); |
1232 | send_connect_info (c->conf->id, c->si, c->conf->protocols); |
|
|
1233 | } |
|
|
1234 | else |
|
|
1235 | c->establish_connection (); |
1072 | } |
1236 | } |
1073 | else |
1237 | else |
1074 | c->establish_connection (); |
1238 | slog (L_WARN, |
|
|
1239 | _("received authenticated connection request from unknown node #%d, config file mismatch?"), |
|
|
1240 | p->id); |
1075 | } |
1241 | } |
1076 | |
1242 | |
1077 | break; |
1243 | break; |
1078 | |
1244 | |
1079 | case vpn_packet::PT_CONNECT_INFO: |
1245 | case vpn_packet::PT_CONNECT_INFO: |
1080 | if (ictx && octx && rsi == si && pkt->hmac_chk (ictx)) |
1246 | if (ictx && octx && rsi == si && pkt->hmac_chk (ictx)) |
1081 | { |
1247 | { |
1082 | connect_info_packet *p = (connect_info_packet *) pkt; |
1248 | connect_info_packet *p = (connect_info_packet *)pkt; |
1083 | |
1249 | |
1084 | assert (p->id > 0 && p->id <= vpn->conns.size ()); // hmac-auth does not mean we accept anything |
1250 | if (p->id > 0 && p->id <= vpn->conns.size ()) |
1085 | |
1251 | { |
1086 | connection *c = vpn->conns[p->id - 1]; |
1252 | connection *c = vpn->conns[p->id - 1]; |
1087 | |
1253 | |
1088 | c->conf->protocols = p->protocols; |
1254 | c->conf->protocols = p->protocols; |
1089 | protocol = best_protocol (c->conf->protocols & THISNODE->protocols & p->si.supported_protocols (c->conf)); |
1255 | protocol = best_protocol (c->conf->protocols & THISNODE->protocols & p->si.supported_protocols (c->conf)); |
1090 | p->si.upgrade_protocol (protocol, c->conf); |
1256 | p->si.upgrade_protocol (protocol, c->conf); |
1091 | |
1257 | |
1092 | slog (L_TRACE, "<<%d PT_CONNECT_INFO(%d,%s) (%d)", |
1258 | slog (L_TRACE, "<<%d PT_CONNECT_INFO(%d,%s) (%d)", |
1093 | conf->id, p->id, (const char *)p->si, !c->ictx && !c->octx); |
1259 | conf->id, p->id, (const char *)p->si, !c->ictx && !c->octx); |
1094 | |
1260 | |
1095 | const sockinfo &dsi = forward_si (p->si); |
1261 | const sockinfo &dsi = forward_si (p->si); |
1096 | |
1262 | |
1097 | if (dsi.valid ()) |
1263 | if (dsi.valid ()) |
1098 | c->send_auth_request (dsi, true); |
1264 | c->send_auth_request (dsi, true); |
|
|
1265 | } |
|
|
1266 | else |
|
|
1267 | slog (L_WARN, |
|
|
1268 | _("received authenticated connection request from unknown node #%d, config file mismatch?"), |
|
|
1269 | p->id); |
1099 | } |
1270 | } |
1100 | |
1271 | |
1101 | break; |
1272 | break; |
1102 | |
1273 | |
1103 | default: |
1274 | default: |
1104 | send_reset (rsi); |
1275 | send_reset (rsi); |
1105 | break; |
1276 | break; |
1106 | } |
1277 | } |
1107 | } |
1278 | } |
1108 | |
1279 | |
1109 | void connection::keepalive_cb (time_watcher &w) |
1280 | inline void |
|
|
1281 | connection::keepalive_cb (ev::timer &w, int revents) |
1110 | { |
1282 | { |
1111 | if (NOW >= last_activity + ::conf.keepalive + 30) |
1283 | if (ev_now () >= last_activity + ::conf.keepalive + 30) |
1112 | { |
1284 | { |
1113 | reset_connection (); |
1285 | reset_connection (); |
1114 | establish_connection (); |
1286 | establish_connection (); |
1115 | } |
1287 | } |
1116 | else if (NOW < last_activity + ::conf.keepalive) |
1288 | else if (ev_now () < last_activity + ::conf.keepalive) |
1117 | w.start (last_activity + ::conf.keepalive); |
1289 | w.start (last_activity + ::conf.keepalive - ev::now ()); |
1118 | else if (conf->connectmode != conf_node::C_ONDEMAND |
1290 | else if (conf->connectmode != conf_node::C_ONDEMAND |
1119 | || THISNODE->connectmode != conf_node::C_ONDEMAND) |
1291 | || THISNODE->connectmode != conf_node::C_ONDEMAND) |
1120 | { |
1292 | { |
1121 | send_ping (si); |
1293 | send_ping (si); |
1122 | w.start (NOW + 5); |
1294 | w.start (5); |
1123 | } |
1295 | } |
1124 | else if (NOW < last_activity + ::conf.keepalive + 10) |
1296 | else if (ev_now () < last_activity + ::conf.keepalive + 10) |
1125 | // hold ondemand connections implicitly a few seconds longer |
1297 | // hold ondemand connections implicitly a few seconds longer |
1126 | // should delete octx, though, or something like that ;) |
1298 | // should delete octx, though, or something like that ;) |
1127 | w.start (last_activity + ::conf.keepalive + 10); |
1299 | w.start (last_activity + ::conf.keepalive + 10 - ev::now ()); |
1128 | else |
1300 | else |
1129 | reset_connection (); |
1301 | reset_connection (); |
1130 | } |
1302 | } |
1131 | |
1303 | |
1132 | void connection::send_connect_request (int id) |
1304 | void connection::send_connect_request (int id) |
… | |
… | |
1138 | send_vpn_packet (p, si); |
1310 | send_vpn_packet (p, si); |
1139 | |
1311 | |
1140 | delete p; |
1312 | delete p; |
1141 | } |
1313 | } |
1142 | |
1314 | |
|
|
1315 | void connection::script_init_env (const char *ext) |
|
|
1316 | { |
|
|
1317 | char *env; |
|
|
1318 | asprintf (&env, "IFUPDATA%s=%s", ext, conf->if_up_data); putenv (env); |
|
|
1319 | asprintf (&env, "NODENAME%s=%s", ext, conf->nodename); putenv (env); |
|
|
1320 | asprintf (&env, "MAC%s=%02x:%02x:%02x:%02x:%02x:%02x", ext, |
|
|
1321 | 0xfe, 0xfd, 0x80, 0x00, conf->id >> 8, |
|
|
1322 | conf->id & 0xff); putenv (env); |
|
|
1323 | } |
|
|
1324 | |
1143 | void connection::script_node () |
1325 | void connection::script_init_connect_env () |
1144 | { |
1326 | { |
1145 | vpn->script_if_up (); |
1327 | vpn->script_init_env (); |
1146 | |
1328 | |
1147 | char *env; |
1329 | char *env; |
1148 | asprintf (&env, "DESTID=%d", conf->id); putenv (env); |
1330 | asprintf (&env, "DESTID=%d", conf->id); putenv (env); |
1149 | asprintf (&env, "DESTNODE=%s", conf->nodename); putenv (env); |
1331 | asprintf (&env, "DESTNODE=%s", conf->nodename); putenv (env); |
1150 | asprintf (&env, "DESTIP=%s", si.ntoa ()); putenv (env); |
1332 | asprintf (&env, "DESTIP=%s", si.ntoa ()); putenv (env); |
1151 | asprintf (&env, "DESTPORT=%d", ntohs (si.port)); putenv (env); |
1333 | asprintf (&env, "DESTPORT=%d", ntohs (si.port)); putenv (env); |
1152 | } |
1334 | } |
1153 | |
1335 | |
|
|
1336 | inline const char * |
1154 | const char *connection::script_node_up () |
1337 | connection::script_node_up () |
1155 | { |
1338 | { |
1156 | script_node (); |
1339 | script_init_connect_env (); |
1157 | |
1340 | |
1158 | putenv ("STATE=up"); |
1341 | putenv ((char *)"STATE=up"); |
1159 | |
1342 | |
|
|
1343 | char *filename; |
|
|
1344 | asprintf (&filename, |
|
|
1345 | "%s/%s", |
|
|
1346 | confbase, |
1160 | return ::conf.script_node_up ? ::conf.script_node_up : "node-up"; |
1347 | ::conf.script_node_up ? ::conf.script_node_up : "node-up"); |
1161 | } |
|
|
1162 | |
1348 | |
|
|
1349 | return filename; |
|
|
1350 | } |
|
|
1351 | |
|
|
1352 | inline const char * |
1163 | const char *connection::script_node_down () |
1353 | connection::script_node_down () |
1164 | { |
1354 | { |
1165 | script_node (); |
1355 | script_init_connect_env (); |
1166 | |
1356 | |
1167 | putenv ("STATE=down"); |
1357 | putenv ((char *)"STATE=down"); |
1168 | |
1358 | |
1169 | return ::conf.script_node_up ? ::conf.script_node_down : "node-down"; |
1359 | char *filename; |
1170 | } |
1360 | asprintf (&filename, |
|
|
1361 | "%s/%s", |
|
|
1362 | confbase, |
|
|
1363 | ::conf.script_node_down ? ::conf.script_node_down : "node-down"); |
1171 | |
1364 | |
|
|
1365 | return filename; |
|
|
1366 | } |
|
|
1367 | |
1172 | connection::connection(struct vpn *vpn_) |
1368 | connection::connection (struct vpn *vpn, conf_node *conf) |
1173 | : vpn(vpn_) |
1369 | : vpn(vpn), conf(conf), |
1174 | , rekey (this, &connection::rekey_cb) |
1370 | #if ENABLE_DNS |
1175 | , keepalive (this, &connection::keepalive_cb) |
1371 | dns (0), |
|
|
1372 | #endif |
|
|
1373 | data_queue(conf->max_ttl, conf->max_queue), |
|
|
1374 | vpn_queue(conf->max_ttl, conf->max_queue) |
|
|
1375 | { |
|
|
1376 | rekey .set<connection, &connection::rekey_cb > (this); |
|
|
1377 | keepalive .set<connection, &connection::keepalive_cb > (this); |
1176 | , establish_connection (this, &connection::establish_connection_cb) |
1378 | establish_connection.set<connection, &connection::establish_connection_cb> (this); |
1177 | { |
1379 | |
|
|
1380 | last_establish_attempt = 0.; |
1178 | octx = ictx = 0; |
1381 | octx = ictx = 0; |
1179 | retry_cnt = 0; |
|
|
1180 | |
1382 | |
1181 | connectmode = conf_node::C_ALWAYS; // initial setting |
1383 | if (!conf->protocols) // make sure some protocol is enabled |
|
|
1384 | conf->protocols = PROT_UDPv4; |
|
|
1385 | |
|
|
1386 | connectmode = conf->connectmode; |
|
|
1387 | |
|
|
1388 | // queue a dummy packet to force an initial connection attempt |
|
|
1389 | if (connectmode != conf_node::C_ALWAYS && connectmode != conf_node::C_DISABLED) |
|
|
1390 | vpn_queue.put (new net_packet); |
|
|
1391 | |
1182 | reset_connection (); |
1392 | reset_connection (); |
1183 | } |
1393 | } |
1184 | |
1394 | |
1185 | connection::~connection () |
1395 | connection::~connection () |
1186 | { |
1396 | { |