| … | |
… | |
| 32 | #include <arpa/inet.h> |
32 | #include <arpa/inet.h> |
| 33 | #include <errno.h> |
33 | #include <errno.h> |
| 34 | #include <time.h> |
34 | #include <time.h> |
| 35 | #include <unistd.h> |
35 | #include <unistd.h> |
| 36 | |
36 | |
| 37 | #include <openssl/rand.h> |
|
|
| 38 | #include <openssl/hmac.h> |
|
|
| 39 | #include <openssl/evp.h> |
|
|
| 40 | #include <openssl/rsa.h> |
|
|
| 41 | #include <openssl/err.h> |
|
|
| 42 | |
|
|
| 43 | extern "C" { |
|
|
| 44 | # include "lzf/lzf.h" |
|
|
| 45 | } |
|
|
| 46 | |
|
|
| 47 | #include "gettext.h" |
|
|
| 48 | #include "pidfile.h" |
37 | #include "pidfile.h" |
| 49 | |
38 | |
| 50 | #include "conf.h" |
39 | #include "connection.h" |
| 51 | #include "slog.h" |
40 | #include "util.h" |
| 52 | #include "device.h" |
|
|
| 53 | #include "protocol.h" |
41 | #include "protocol.h" |
| 54 | |
42 | |
| 55 | #if !HAVE_RAND_PSEUDO_BYTES |
|
|
| 56 | # define RAND_pseudo_bytes RAND_bytes |
|
|
| 57 | #endif |
|
|
| 58 | |
|
|
| 59 | static time_t next_timecheck; |
|
|
| 60 | |
|
|
| 61 | #define MAGIC "vped\xbd\xc6\xdb\x82" // 8 bytes of magic |
|
|
| 62 | |
|
|
| 63 | static const rsachallenge & |
|
|
| 64 | challenge_bytes () |
|
|
| 65 | { |
|
|
| 66 | static rsachallenge challenge; |
|
|
| 67 | static double challenge_ttl; // time this challenge needs to be recreated |
|
|
| 68 | |
|
|
| 69 | if (NOW > challenge_ttl) |
|
|
| 70 | { |
|
|
| 71 | RAND_bytes ((unsigned char *)&challenge, sizeof (challenge)); |
|
|
| 72 | challenge_ttl = NOW + CHALLENGE_TTL; |
|
|
| 73 | } |
|
|
| 74 | |
|
|
| 75 | return challenge; |
|
|
| 76 | } |
|
|
| 77 | |
|
|
| 78 | // caching of rsa operations really helps slow computers |
|
|
| 79 | struct rsa_entry { |
|
|
| 80 | tstamp expire; |
|
|
| 81 | rsachallenge chg; |
|
|
| 82 | RSA *key; // which key |
|
|
| 83 | rsaencrdata encr; |
|
|
| 84 | |
|
|
| 85 | rsa_entry () |
|
|
| 86 | { |
|
|
| 87 | expire = NOW + CHALLENGE_TTL; |
|
|
| 88 | } |
|
|
| 89 | }; |
|
|
| 90 | |
|
|
| 91 | struct rsa_cache : list<rsa_entry> |
|
|
| 92 | { |
|
|
| 93 | void cleaner_cb (tstamp &ts); time_watcher cleaner; |
|
|
| 94 | |
|
|
| 95 | const rsaencrdata *public_encrypt (RSA *key, const rsachallenge &chg) |
|
|
| 96 | { |
|
|
| 97 | for (iterator i = begin (); i != end (); ++i) |
|
|
| 98 | { |
|
|
| 99 | if (i->key == key && !memcmp (&chg, &i->chg, sizeof chg)) |
|
|
| 100 | return &i->encr; |
|
|
| 101 | } |
|
|
| 102 | |
|
|
| 103 | if (cleaner.at < NOW) |
|
|
| 104 | cleaner.start (NOW + CHALLENGE_TTL); |
|
|
| 105 | |
|
|
| 106 | resize (size () + 1); |
|
|
| 107 | rsa_entry *e = &(*rbegin ()); |
|
|
| 108 | |
|
|
| 109 | e->key = key; |
|
|
| 110 | memcpy (&e->chg, &chg, sizeof chg); |
|
|
| 111 | |
|
|
| 112 | if (0 > RSA_public_encrypt (sizeof chg, |
|
|
| 113 | (unsigned char *)&chg, (unsigned char *)&e->encr, |
|
|
| 114 | key, RSA_PKCS1_OAEP_PADDING)) |
|
|
| 115 | fatal ("RSA_public_encrypt error"); |
|
|
| 116 | |
|
|
| 117 | return &e->encr; |
|
|
| 118 | } |
|
|
| 119 | |
|
|
| 120 | const rsachallenge *private_decrypt (RSA *key, const rsaencrdata &encr) |
|
|
| 121 | { |
|
|
| 122 | for (iterator i = begin (); i != end (); ++i) |
|
|
| 123 | if (i->key == key && !memcmp (&encr, &i->encr, sizeof encr)) |
|
|
| 124 | return &i->chg; |
|
|
| 125 | |
|
|
| 126 | if (cleaner.at < NOW) |
|
|
| 127 | cleaner.start (NOW + CHALLENGE_TTL); |
|
|
| 128 | |
|
|
| 129 | resize (size () + 1); |
|
|
| 130 | rsa_entry *e = &(*rbegin ()); |
|
|
| 131 | |
|
|
| 132 | e->key = key; |
|
|
| 133 | memcpy (&e->encr, &encr, sizeof encr); |
|
|
| 134 | |
|
|
| 135 | if (0 > RSA_private_decrypt (sizeof encr, |
|
|
| 136 | (unsigned char *)&encr, (unsigned char *)&e->chg, |
|
|
| 137 | key, RSA_PKCS1_OAEP_PADDING)) |
|
|
| 138 | { |
|
|
| 139 | pop_back (); |
|
|
| 140 | return 0; |
|
|
| 141 | } |
|
|
| 142 | |
|
|
| 143 | return &e->chg; |
|
|
| 144 | } |
|
|
| 145 | |
|
|
| 146 | rsa_cache () |
|
|
| 147 | : cleaner (this, &rsa_cache::cleaner_cb) |
|
|
| 148 | { } |
|
|
| 149 | |
|
|
| 150 | } rsa_cache; |
|
|
| 151 | |
|
|
| 152 | void rsa_cache::cleaner_cb (tstamp &ts) |
|
|
| 153 | { |
|
|
| 154 | if (empty ()) |
|
|
| 155 | ts = TSTAMP_CANCEL; |
|
|
| 156 | else |
|
|
| 157 | { |
|
|
| 158 | ts = NOW + 3; |
|
|
| 159 | for (iterator i = begin (); i != end (); ) |
|
|
| 160 | { |
|
|
| 161 | if (i->expire >= NOW) |
|
|
| 162 | i = erase (i); |
|
|
| 163 | else |
|
|
| 164 | ++i; |
|
|
| 165 | } |
|
|
| 166 | } |
|
|
| 167 | } |
|
|
| 168 | |
|
|
| 169 | // run a script. yes, it's a template function. yes, c++ |
|
|
| 170 | // is not a functional language. yes, this suxx. |
|
|
| 171 | template<class owner> |
|
|
| 172 | static void |
|
|
| 173 | run_script (owner *obj, const char *(owner::*setup)(), bool wait) |
|
|
| 174 | { |
|
|
| 175 | int pid; |
|
|
| 176 | |
|
|
| 177 | if ((pid = fork ()) == 0) |
|
|
| 178 | { |
|
|
| 179 | char *filename; |
|
|
| 180 | asprintf (&filename, "%s/%s", confbase, (obj->*setup) ()); |
|
|
| 181 | execl (filename, filename, (char *) 0); |
|
|
| 182 | exit (255); |
|
|
| 183 | } |
|
|
| 184 | else if (pid > 0) |
|
|
| 185 | { |
|
|
| 186 | if (wait) |
|
|
| 187 | { |
|
|
| 188 | waitpid (pid, 0, 0); |
|
|
| 189 | /* TODO: check status */ |
|
|
| 190 | } |
|
|
| 191 | } |
|
|
| 192 | } |
|
|
| 193 | |
|
|
| 194 | // xor the socket address into the challenge to ensure different challenges |
|
|
| 195 | // per host. we could rely on the OAEP padding, but this doesn't hurt. |
|
|
| 196 | void |
|
|
| 197 | xor_sa (rsachallenge &k, SOCKADDR *sa) |
|
|
| 198 | { |
|
|
| 199 | ((u32 *) k)[(CHG_CIPHER_KEY + 0) / 4] ^= sa->sin_addr.s_addr; |
|
|
| 200 | ((u16 *) k)[(CHG_CIPHER_KEY + 4) / 2] ^= sa->sin_port; |
|
|
| 201 | ((u32 *) k)[(CHG_HMAC_KEY + 0) / 4] ^= sa->sin_addr.s_addr; |
|
|
| 202 | ((u16 *) k)[(CHG_HMAC_KEY + 4) / 2] ^= sa->sin_port; |
|
|
| 203 | } |
|
|
| 204 | |
|
|
| 205 | struct crypto_ctx |
|
|
| 206 | { |
|
|
| 207 | EVP_CIPHER_CTX cctx; |
|
|
| 208 | HMAC_CTX hctx; |
|
|
| 209 | |
|
|
| 210 | crypto_ctx (const rsachallenge &challenge, int enc); |
|
|
| 211 | ~crypto_ctx (); |
|
|
| 212 | }; |
|
|
| 213 | |
|
|
| 214 | crypto_ctx::crypto_ctx (const rsachallenge &challenge, int enc) |
|
|
| 215 | { |
|
|
| 216 | EVP_CIPHER_CTX_init (&cctx); |
|
|
| 217 | EVP_CipherInit_ex (&cctx, CIPHER, 0, &challenge[CHG_CIPHER_KEY], 0, enc); |
|
|
| 218 | HMAC_CTX_init (&hctx); |
|
|
| 219 | HMAC_Init_ex (&hctx, &challenge[CHG_HMAC_KEY], HMAC_KEYLEN, DIGEST, 0); |
|
|
| 220 | } |
|
|
| 221 | |
|
|
| 222 | crypto_ctx::~crypto_ctx () |
|
|
| 223 | { |
|
|
| 224 | EVP_CIPHER_CTX_cleanup (&cctx); |
|
|
| 225 | HMAC_CTX_cleanup (&hctx); |
|
|
| 226 | } |
|
|
| 227 | |
|
|
| 228 | ////////////////////////////////////////////////////////////////////////////// |
|
|
| 229 | |
|
|
| 230 | void pkt_queue::put (tap_packet *p) |
|
|
| 231 | { |
|
|
| 232 | if (queue[i]) |
|
|
| 233 | { |
|
|
| 234 | delete queue[i]; |
|
|
| 235 | j = (j + 1) % QUEUEDEPTH; |
|
|
| 236 | } |
|
|
| 237 | |
|
|
| 238 | queue[i] = p; |
|
|
| 239 | |
|
|
| 240 | i = (i + 1) % QUEUEDEPTH; |
|
|
| 241 | } |
|
|
| 242 | |
|
|
| 243 | tap_packet *pkt_queue::get () |
|
|
| 244 | { |
|
|
| 245 | tap_packet *p = queue[j]; |
|
|
| 246 | |
|
|
| 247 | if (p) |
|
|
| 248 | { |
|
|
| 249 | queue[j] = 0; |
|
|
| 250 | j = (j + 1) % QUEUEDEPTH; |
|
|
| 251 | } |
|
|
| 252 | |
|
|
| 253 | return p; |
|
|
| 254 | } |
|
|
| 255 | |
|
|
| 256 | pkt_queue::pkt_queue () |
|
|
| 257 | { |
|
|
| 258 | memset (queue, 0, sizeof (queue)); |
|
|
| 259 | i = 0; |
|
|
| 260 | j = 0; |
|
|
| 261 | } |
|
|
| 262 | |
|
|
| 263 | pkt_queue::~pkt_queue () |
|
|
| 264 | { |
|
|
| 265 | for (i = QUEUEDEPTH; --i > 0; ) |
|
|
| 266 | delete queue[i]; |
|
|
| 267 | } |
|
|
| 268 | |
|
|
| 269 | // only do action once every x seconds per host. |
|
|
| 270 | // currently this is quite a slow implementation, |
|
|
| 271 | // but suffices for normal operation. |
|
|
| 272 | struct u32_rate_limiter : private map<u32, tstamp> |
|
|
| 273 | { |
|
|
| 274 | tstamp every; |
|
|
| 275 | |
|
|
| 276 | bool can (u32 host); |
|
|
| 277 | |
|
|
| 278 | u32_rate_limiter (tstamp every = 1) |
|
|
| 279 | { |
|
|
| 280 | this->every = every; |
|
|
| 281 | } |
|
|
| 282 | }; |
|
|
| 283 | |
|
|
| 284 | struct net_rate_limiter : u32_rate_limiter |
|
|
| 285 | { |
|
|
| 286 | bool can (SOCKADDR *sa) { return u32_rate_limiter::can((u32)sa->sin_addr.s_addr); } |
|
|
| 287 | bool can (sockinfo &si) { return u32_rate_limiter::can((u32)si.host); } |
|
|
| 288 | |
|
|
| 289 | net_rate_limiter (tstamp every) : u32_rate_limiter (every) {} |
|
|
| 290 | }; |
|
|
| 291 | |
|
|
| 292 | bool u32_rate_limiter::can (u32 host) |
|
|
| 293 | { |
|
|
| 294 | iterator i; |
|
|
| 295 | |
|
|
| 296 | for (i = begin (); i != end (); ) |
|
|
| 297 | if (i->second <= NOW) |
|
|
| 298 | { |
|
|
| 299 | erase (i); |
|
|
| 300 | i = begin (); |
|
|
| 301 | } |
|
|
| 302 | else |
|
|
| 303 | ++i; |
|
|
| 304 | |
|
|
| 305 | i = find (host); |
|
|
| 306 | |
|
|
| 307 | if (i != end ()) |
|
|
| 308 | return false; |
|
|
| 309 | |
|
|
| 310 | insert (value_type (host, NOW + every)); |
|
|
| 311 | |
|
|
| 312 | return true; |
|
|
| 313 | } |
|
|
| 314 | |
|
|
| 315 | ///////////////////////////////////////////////////////////////////////////// |
43 | ///////////////////////////////////////////////////////////////////////////// |
| 316 | |
44 | |
| 317 | static void next_wakeup (time_t next) |
|
|
| 318 | { |
|
|
| 319 | if (next_timecheck > next) |
|
|
| 320 | next_timecheck = next; |
|
|
| 321 | } |
|
|
| 322 | |
|
|
| 323 | static unsigned char hmac_digest[EVP_MAX_MD_SIZE]; |
|
|
| 324 | |
|
|
| 325 | struct hmac_packet:net_packet |
|
|
| 326 | { |
|
|
| 327 | u8 hmac[HMACLENGTH]; // each and every packet has a hmac field, but that is not (yet) checked everywhere |
|
|
| 328 | |
|
|
| 329 | void hmac_set (crypto_ctx * ctx); |
|
|
| 330 | bool hmac_chk (crypto_ctx * ctx); |
|
|
| 331 | |
|
|
| 332 | private: |
|
|
| 333 | void hmac_gen (crypto_ctx * ctx) |
|
|
| 334 | { |
|
|
| 335 | unsigned int xlen; |
|
|
| 336 | HMAC_CTX *hctx = &ctx->hctx; |
|
|
| 337 | |
|
|
| 338 | HMAC_Init_ex (hctx, 0, 0, 0, 0); |
|
|
| 339 | HMAC_Update (hctx, ((unsigned char *) this) + sizeof (hmac_packet), |
|
|
| 340 | len - sizeof (hmac_packet)); |
|
|
| 341 | HMAC_Final (hctx, (unsigned char *) &hmac_digest, &xlen); |
|
|
| 342 | } |
|
|
| 343 | }; |
|
|
| 344 | |
|
|
| 345 | void |
|
|
| 346 | hmac_packet::hmac_set (crypto_ctx * ctx) |
|
|
| 347 | { |
|
|
| 348 | hmac_gen (ctx); |
|
|
| 349 | |
|
|
| 350 | memcpy (hmac, hmac_digest, HMACLENGTH); |
|
|
| 351 | } |
|
|
| 352 | |
|
|
| 353 | bool |
|
|
| 354 | hmac_packet::hmac_chk (crypto_ctx * ctx) |
|
|
| 355 | { |
|
|
| 356 | hmac_gen (ctx); |
|
|
| 357 | |
|
|
| 358 | return !memcmp (hmac, hmac_digest, HMACLENGTH); |
|
|
| 359 | } |
|
|
| 360 | |
|
|
| 361 | struct vpn_packet : hmac_packet |
|
|
| 362 | { |
|
|
| 363 | enum ptype |
|
|
| 364 | { |
|
|
| 365 | PT_RESET = 0, |
|
|
| 366 | PT_DATA_UNCOMPRESSED, |
|
|
| 367 | PT_DATA_COMPRESSED, |
|
|
| 368 | PT_PING, PT_PONG, // wasting namespace space? ;) |
|
|
| 369 | PT_AUTH, // authentification |
|
|
| 370 | PT_CONNECT_REQ, // want other host to contact me |
|
|
| 371 | PT_CONNECT_INFO, // request connection to some node |
|
|
| 372 | PT_REKEY, // rekeying (not yet implemented) |
|
|
| 373 | PT_MAX |
|
|
| 374 | }; |
|
|
| 375 | |
|
|
| 376 | u8 type; |
|
|
| 377 | u8 srcdst, src1, dst1; |
|
|
| 378 | |
|
|
| 379 | void set_hdr (ptype type, unsigned int dst); |
|
|
| 380 | |
|
|
| 381 | unsigned int src () |
|
|
| 382 | { |
|
|
| 383 | return src1 | ((srcdst >> 4) << 8); |
|
|
| 384 | } |
|
|
| 385 | |
|
|
| 386 | unsigned int dst () |
|
|
| 387 | { |
|
|
| 388 | return dst1 | ((srcdst & 0xf) << 8); |
|
|
| 389 | } |
|
|
| 390 | |
|
|
| 391 | ptype typ () |
|
|
| 392 | { |
|
|
| 393 | return (ptype) type; |
|
|
| 394 | } |
|
|
| 395 | }; |
|
|
| 396 | |
|
|
| 397 | void vpn_packet::set_hdr (ptype type, unsigned int dst) |
|
|
| 398 | { |
|
|
| 399 | this->type = type; |
|
|
| 400 | |
|
|
| 401 | int src = THISNODE->id; |
|
|
| 402 | |
|
|
| 403 | src1 = src; |
|
|
| 404 | srcdst = ((src >> 8) << 4) | (dst >> 8); |
|
|
| 405 | dst1 = dst; |
|
|
| 406 | } |
|
|
| 407 | |
|
|
| 408 | #define MAXVPNDATA (MAX_MTU - 6 - 6) |
|
|
| 409 | #define DATAHDR (sizeof (u32) + RAND_SIZE) |
|
|
| 410 | |
|
|
| 411 | struct vpndata_packet:vpn_packet |
|
|
| 412 | { |
|
|
| 413 | u8 data[MAXVPNDATA + DATAHDR]; // seqno |
|
|
| 414 | |
|
|
| 415 | void setup (connection *conn, int dst, u8 *d, u32 len, u32 seqno); |
|
|
| 416 | tap_packet *unpack (connection *conn, u32 &seqno); |
|
|
| 417 | private: |
|
|
| 418 | |
|
|
| 419 | const u32 data_hdr_size () const |
|
|
| 420 | { |
|
|
| 421 | return sizeof (vpndata_packet) - sizeof (net_packet) - MAXVPNDATA - DATAHDR; |
|
|
| 422 | } |
|
|
| 423 | }; |
|
|
| 424 | |
|
|
| 425 | void |
|
|
| 426 | vpndata_packet::setup (connection *conn, int dst, u8 *d, u32 l, u32 seqno) |
|
|
| 427 | { |
|
|
| 428 | EVP_CIPHER_CTX *cctx = &conn->octx->cctx; |
|
|
| 429 | int outl = 0, outl2; |
|
|
| 430 | ptype type = PT_DATA_UNCOMPRESSED; |
|
|
| 431 | |
|
|
| 432 | #if ENABLE_COMPRESSION |
|
|
| 433 | u8 cdata[MAX_MTU]; |
|
|
| 434 | u32 cl; |
|
|
| 435 | |
|
|
| 436 | cl = lzf_compress (d, l, cdata + 2, (l - 2) & ~7); |
|
|
| 437 | if (cl) |
|
|
| 438 | { |
|
|
| 439 | type = PT_DATA_COMPRESSED; |
|
|
| 440 | d = cdata; |
|
|
| 441 | l = cl + 2; |
|
|
| 442 | |
|
|
| 443 | d[0] = cl >> 8; |
|
|
| 444 | d[1] = cl; |
|
|
| 445 | } |
|
|
| 446 | #endif |
|
|
| 447 | |
|
|
| 448 | EVP_EncryptInit_ex (cctx, 0, 0, 0, 0); |
|
|
| 449 | |
|
|
| 450 | #if RAND_SIZE |
|
|
| 451 | struct { |
|
|
| 452 | u8 rnd[RAND_SIZE]; |
|
|
| 453 | u32 seqno; |
|
|
| 454 | } datahdr; |
|
|
| 455 | |
|
|
| 456 | datahdr.seqno = seqno; |
|
|
| 457 | RAND_pseudo_bytes ((unsigned char *) datahdr.rnd, RAND_SIZE); |
|
|
| 458 | |
|
|
| 459 | EVP_EncryptUpdate (cctx, |
|
|
| 460 | (unsigned char *) data + outl, &outl2, |
|
|
| 461 | (unsigned char *) &datahdr, DATAHDR); |
|
|
| 462 | outl += outl2; |
|
|
| 463 | #else |
|
|
| 464 | EVP_EncryptUpdate (cctx, |
|
|
| 465 | (unsigned char *) data + outl, &outl2, |
|
|
| 466 | (unsigned char *) &seqno, DATAHDR); |
|
|
| 467 | outl += outl2; |
|
|
| 468 | #endif |
|
|
| 469 | |
|
|
| 470 | EVP_EncryptUpdate (cctx, |
|
|
| 471 | (unsigned char *) data + outl, &outl2, |
|
|
| 472 | (unsigned char *) d, l); |
|
|
| 473 | outl += outl2; |
|
|
| 474 | |
|
|
| 475 | EVP_EncryptFinal_ex (cctx, (unsigned char *) data + outl, &outl2); |
|
|
| 476 | outl += outl2; |
|
|
| 477 | |
|
|
| 478 | len = outl + data_hdr_size (); |
|
|
| 479 | |
|
|
| 480 | set_hdr (type, dst); |
|
|
| 481 | |
|
|
| 482 | hmac_set (conn->octx); |
|
|
| 483 | } |
|
|
| 484 | |
|
|
| 485 | tap_packet * |
|
|
| 486 | vpndata_packet::unpack (connection *conn, u32 &seqno) |
|
|
| 487 | { |
|
|
| 488 | EVP_CIPHER_CTX *cctx = &conn->ictx->cctx; |
|
|
| 489 | int outl = 0, outl2; |
|
|
| 490 | tap_packet *p = new tap_packet; |
|
|
| 491 | u8 *d; |
|
|
| 492 | u32 l = len - data_hdr_size (); |
|
|
| 493 | |
|
|
| 494 | EVP_DecryptInit_ex (cctx, 0, 0, 0, 0); |
|
|
| 495 | |
|
|
| 496 | #if ENABLE_COMPRESSION |
|
|
| 497 | u8 cdata[MAX_MTU]; |
|
|
| 498 | |
|
|
| 499 | if (type == PT_DATA_COMPRESSED) |
|
|
| 500 | d = cdata; |
|
|
| 501 | else |
|
|
| 502 | #endif |
|
|
| 503 | d = &(*p)[6 + 6 - DATAHDR]; |
|
|
| 504 | |
|
|
| 505 | /* this overwrites part of the src mac, but we fix that later */ |
|
|
| 506 | EVP_DecryptUpdate (cctx, |
|
|
| 507 | d, &outl2, |
|
|
| 508 | (unsigned char *)&data, len - data_hdr_size ()); |
|
|
| 509 | outl += outl2; |
|
|
| 510 | |
|
|
| 511 | EVP_DecryptFinal_ex (cctx, (unsigned char *)d + outl, &outl2); |
|
|
| 512 | outl += outl2; |
|
|
| 513 | |
|
|
| 514 | seqno = *(u32 *)(d + RAND_SIZE); |
|
|
| 515 | |
|
|
| 516 | id2mac (dst () ? dst() : THISNODE->id, p->dst); |
|
|
| 517 | id2mac (src (), p->src); |
|
|
| 518 | |
|
|
| 519 | #if ENABLE_COMPRESSION |
|
|
| 520 | if (type == PT_DATA_COMPRESSED) |
|
|
| 521 | { |
|
|
| 522 | u32 cl = (d[DATAHDR] << 8) | d[DATAHDR + 1]; |
|
|
| 523 | p->len = lzf_decompress (d + DATAHDR + 2, cl, &(*p)[6 + 6], MAX_MTU) + 6 + 6; |
|
|
| 524 | } |
|
|
| 525 | else |
|
|
| 526 | p->len = outl + (6 + 6 - DATAHDR); |
|
|
| 527 | #endif |
|
|
| 528 | |
|
|
| 529 | return p; |
|
|
| 530 | } |
|
|
| 531 | |
|
|
| 532 | struct ping_packet : vpn_packet |
|
|
| 533 | { |
|
|
| 534 | void setup (int dst, ptype type) |
|
|
| 535 | { |
|
|
| 536 | set_hdr (type, dst); |
|
|
| 537 | len = sizeof (*this) - sizeof (net_packet); |
|
|
| 538 | } |
|
|
| 539 | }; |
|
|
| 540 | |
|
|
| 541 | struct config_packet : vpn_packet |
|
|
| 542 | { |
|
|
| 543 | // actually, hmaclen cannot be checked because the hmac |
|
|
| 544 | // field comes before this data, so peers with other |
|
|
| 545 | // hmacs simply will not work. |
|
|
| 546 | u8 prot_major, prot_minor, randsize, hmaclen; |
|
|
| 547 | u8 flags, challengelen, pad2, pad3; |
|
|
| 548 | u32 cipher_nid; |
|
|
| 549 | u32 digest_nid; |
|
|
| 550 | |
|
|
| 551 | const u8 curflags () const |
|
|
| 552 | { |
|
|
| 553 | return 0x80 |
|
|
| 554 | | 0x02 |
|
|
| 555 | #if PROTOCOL_MAJOR != 2 |
|
|
| 556 | #error hi |
|
|
| 557 | #endif |
|
|
| 558 | | (ENABLE_COMPRESSION ? 0x01 : 0x00); |
|
|
| 559 | } |
|
|
| 560 | |
|
|
| 561 | void setup (ptype type, int dst) |
|
|
| 562 | { |
|
|
| 563 | prot_major = PROTOCOL_MAJOR; |
|
|
| 564 | prot_minor = PROTOCOL_MINOR; |
|
|
| 565 | randsize = RAND_SIZE; |
|
|
| 566 | hmaclen = HMACLENGTH; |
|
|
| 567 | flags = curflags (); |
|
|
| 568 | challengelen = sizeof (rsachallenge); |
|
|
| 569 | |
|
|
| 570 | cipher_nid = htonl (EVP_CIPHER_nid (CIPHER)); |
|
|
| 571 | digest_nid = htonl (EVP_MD_type (DIGEST)); |
|
|
| 572 | |
|
|
| 573 | len = sizeof (*this) - sizeof (net_packet); |
|
|
| 574 | set_hdr (type, dst); |
|
|
| 575 | } |
|
|
| 576 | |
|
|
| 577 | bool chk_config () |
|
|
| 578 | { |
|
|
| 579 | return prot_major == PROTOCOL_MAJOR |
|
|
| 580 | && randsize == RAND_SIZE |
|
|
| 581 | && hmaclen == HMACLENGTH |
|
|
| 582 | && flags == curflags () |
|
|
| 583 | && challengelen == sizeof (rsachallenge) |
|
|
| 584 | && cipher_nid == htonl (EVP_CIPHER_nid (CIPHER)) |
|
|
| 585 | && digest_nid == htonl (EVP_MD_type (DIGEST)); |
|
|
| 586 | } |
|
|
| 587 | }; |
|
|
| 588 | |
|
|
| 589 | struct auth_packet : config_packet |
|
|
| 590 | { |
|
|
| 591 | char magic[8]; |
|
|
| 592 | u8 subtype; |
|
|
| 593 | u8 pad1, pad2; |
|
|
| 594 | rsaencrdata challenge; |
|
|
| 595 | |
|
|
| 596 | auth_packet (int dst, auth_subtype stype) |
|
|
| 597 | { |
|
|
| 598 | config_packet::setup (PT_AUTH, dst); |
|
|
| 599 | subtype = stype; |
|
|
| 600 | len = sizeof (*this) - sizeof (net_packet); |
|
|
| 601 | strncpy (magic, MAGIC, 8); |
|
|
| 602 | } |
|
|
| 603 | }; |
|
|
| 604 | |
|
|
| 605 | struct connect_req_packet : vpn_packet |
|
|
| 606 | { |
|
|
| 607 | u8 id; |
|
|
| 608 | u8 pad1, pad2, pad3; |
|
|
| 609 | |
|
|
| 610 | connect_req_packet (int dst, int id) |
|
|
| 611 | { |
|
|
| 612 | this->id = id; |
|
|
| 613 | set_hdr (PT_CONNECT_REQ, dst); |
|
|
| 614 | len = sizeof (*this) - sizeof (net_packet); |
|
|
| 615 | } |
|
|
| 616 | }; |
|
|
| 617 | |
|
|
| 618 | struct connect_info_packet : vpn_packet |
|
|
| 619 | { |
|
|
| 620 | u8 id; |
|
|
| 621 | u8 pad1, pad2, pad3; |
|
|
| 622 | sockinfo si; |
|
|
| 623 | |
|
|
| 624 | connect_info_packet (int dst, int id, sockinfo &si) |
|
|
| 625 | { |
|
|
| 626 | this->id = id; |
|
|
| 627 | this->si = si; |
|
|
| 628 | set_hdr (PT_CONNECT_INFO, dst); |
|
|
| 629 | len = sizeof (*this) - sizeof (net_packet); |
|
|
| 630 | } |
|
|
| 631 | }; |
|
|
| 632 | |
|
|
| 633 | ///////////////////////////////////////////////////////////////////////////// |
|
|
| 634 | |
|
|
| 635 | void |
|
|
| 636 | fill_sa (SOCKADDR *sa, conf_node *conf) |
|
|
| 637 | { |
|
|
| 638 | sa->sin_family = AF_INET; |
|
|
| 639 | sa->sin_port = htons (conf->port); |
|
|
| 640 | sa->sin_addr.s_addr = 0; |
|
|
| 641 | |
|
|
| 642 | if (conf->hostname) |
|
|
| 643 | { |
|
|
| 644 | struct hostent *he = gethostbyname (conf->hostname); |
|
|
| 645 | |
|
|
| 646 | if (he |
|
|
| 647 | && he->h_addrtype == AF_INET && he->h_length == 4 && he->h_addr_list[0]) |
|
|
| 648 | { |
|
|
| 649 | //sa->sin_family = he->h_addrtype; |
|
|
| 650 | memcpy (&sa->sin_addr, he->h_addr_list[0], 4); |
|
|
| 651 | } |
|
|
| 652 | else |
|
|
| 653 | slog (L_NOTICE, _("unable to resolve host '%s'"), conf->hostname); |
|
|
| 654 | } |
|
|
| 655 | } |
|
|
| 656 | |
|
|
| 657 | void |
|
|
| 658 | connection::reset_dstaddr () |
|
|
| 659 | { |
|
|
| 660 | fill_sa (&sa, conf); |
|
|
| 661 | } |
|
|
| 662 | |
|
|
| 663 | void |
|
|
| 664 | connection::send_ping (SOCKADDR *dsa, u8 pong) |
|
|
| 665 | { |
|
|
| 666 | ping_packet *pkt = new ping_packet; |
|
|
| 667 | |
|
|
| 668 | pkt->setup (conf->id, pong ? ping_packet::PT_PONG : ping_packet::PT_PING); |
|
|
| 669 | vpn->send_vpn_packet (pkt, dsa, IPTOS_LOWDELAY); |
|
|
| 670 | |
|
|
| 671 | delete pkt; |
|
|
| 672 | } |
|
|
| 673 | |
|
|
| 674 | void |
|
|
| 675 | connection::send_reset (SOCKADDR *dsa) |
|
|
| 676 | { |
|
|
| 677 | static net_rate_limiter limiter(1); |
|
|
| 678 | |
|
|
| 679 | if (limiter.can (dsa) && connectmode != conf_node::C_DISABLED) |
|
|
| 680 | { |
|
|
| 681 | config_packet *pkt = new config_packet; |
|
|
| 682 | |
|
|
| 683 | pkt->setup (vpn_packet::PT_RESET, conf->id); |
|
|
| 684 | vpn->send_vpn_packet (pkt, dsa, IPTOS_MINCOST); |
|
|
| 685 | |
|
|
| 686 | delete pkt; |
|
|
| 687 | } |
|
|
| 688 | } |
|
|
| 689 | |
|
|
| 690 | static rsachallenge * |
|
|
| 691 | gen_challenge (u32 seqrand, SOCKADDR *sa) |
|
|
| 692 | { |
|
|
| 693 | static rsachallenge k; |
|
|
| 694 | |
|
|
| 695 | memcpy (&k, &challenge_bytes (), sizeof (k)); |
|
|
| 696 | *(u32 *)&k[CHG_SEQNO] ^= seqrand; |
|
|
| 697 | xor_sa (k, sa); |
|
|
| 698 | |
|
|
| 699 | return &k; |
|
|
| 700 | } |
|
|
| 701 | |
|
|
| 702 | void |
|
|
| 703 | connection::send_auth (auth_subtype subtype, SOCKADDR *sa, const rsachallenge *k) |
|
|
| 704 | { |
|
|
| 705 | static net_rate_limiter limiter(0.2); |
|
|
| 706 | |
|
|
| 707 | if (subtype != AUTH_INIT || limiter.can (sa)) |
|
|
| 708 | { |
|
|
| 709 | if (!k) |
|
|
| 710 | k = gen_challenge (seqrand, sa); |
|
|
| 711 | |
|
|
| 712 | auth_packet *pkt = new auth_packet (conf->id, subtype); |
|
|
| 713 | |
|
|
| 714 | memcpy (pkt->challenge, rsa_cache.public_encrypt (conf->rsa_key, *k), sizeof (rsaencrdata)); |
|
|
| 715 | |
|
|
| 716 | slog (L_TRACE, ">>%d PT_AUTH(%d) [%s]", conf->id, subtype, (const char *)sockinfo (sa)); |
|
|
| 717 | |
|
|
| 718 | vpn->send_vpn_packet (pkt, sa, IPTOS_RELIABILITY); |
|
|
| 719 | |
|
|
| 720 | delete pkt; |
|
|
| 721 | } |
|
|
| 722 | } |
|
|
| 723 | |
|
|
| 724 | void |
|
|
| 725 | connection::establish_connection_cb (tstamp &ts) |
|
|
| 726 | { |
|
|
| 727 | if (ictx || conf == THISNODE || connectmode == conf_node::C_NEVER) |
|
|
| 728 | ts = TSTAMP_CANCEL; |
|
|
| 729 | else if (ts <= NOW) |
|
|
| 730 | { |
|
|
| 731 | double retry_int = double (retry_cnt & 3 ? (retry_cnt & 3) : 1 << (retry_cnt >> 2)) * 0.25; |
|
|
| 732 | |
|
|
| 733 | if (retry_int < 3600 * 8) |
|
|
| 734 | retry_cnt++; |
|
|
| 735 | |
|
|
| 736 | if (connectmode == conf_node::C_ONDEMAND |
|
|
| 737 | && retry_int > ::conf.keepalive) |
|
|
| 738 | retry_int = ::conf.keepalive; |
|
|
| 739 | |
|
|
| 740 | ts = NOW + retry_int; |
|
|
| 741 | |
|
|
| 742 | if (conf->hostname) |
|
|
| 743 | { |
|
|
| 744 | reset_dstaddr (); |
|
|
| 745 | if (sa.sin_addr.s_addr) |
|
|
| 746 | if (retry_cnt < 4) |
|
|
| 747 | send_auth (AUTH_INIT, &sa); |
|
|
| 748 | else |
|
|
| 749 | send_ping (&sa, 0); |
|
|
| 750 | } |
|
|
| 751 | else |
|
|
| 752 | vpn->connect_request (conf->id); |
|
|
| 753 | } |
|
|
| 754 | } |
|
|
| 755 | |
|
|
| 756 | void |
|
|
| 757 | connection::reset_connection () |
|
|
| 758 | { |
|
|
| 759 | if (ictx && octx) |
|
|
| 760 | { |
|
|
| 761 | slog (L_INFO, _("connection to %d (%s) lost"), conf->id, conf->nodename); |
|
|
| 762 | |
|
|
| 763 | if (::conf.script_node_down) |
|
|
| 764 | run_script (this, &connection::script_node_down, false); |
|
|
| 765 | } |
|
|
| 766 | |
|
|
| 767 | delete ictx; ictx = 0; |
|
|
| 768 | delete octx; octx = 0; |
|
|
| 769 | |
|
|
| 770 | RAND_bytes ((unsigned char *)&seqrand, sizeof (u32)); |
|
|
| 771 | |
|
|
| 772 | sa.sin_port = 0; |
|
|
| 773 | sa.sin_addr.s_addr = 0; |
|
|
| 774 | |
|
|
| 775 | last_activity = 0; |
|
|
| 776 | |
|
|
| 777 | rekey.reset (); |
|
|
| 778 | keepalive.reset (); |
|
|
| 779 | establish_connection.reset (); |
|
|
| 780 | } |
|
|
| 781 | |
|
|
| 782 | void |
|
|
| 783 | connection::shutdown () |
|
|
| 784 | { |
|
|
| 785 | if (ictx && octx) |
|
|
| 786 | send_reset (&sa); |
|
|
| 787 | |
|
|
| 788 | reset_connection (); |
|
|
| 789 | } |
|
|
| 790 | |
|
|
| 791 | void |
|
|
| 792 | connection::rekey_cb (tstamp &ts) |
|
|
| 793 | { |
|
|
| 794 | ts = TSTAMP_CANCEL; |
|
|
| 795 | |
|
|
| 796 | reset_connection (); |
|
|
| 797 | establish_connection (); |
|
|
| 798 | } |
|
|
| 799 | |
|
|
| 800 | void |
|
|
| 801 | connection::send_data_packet (tap_packet * pkt, bool broadcast) |
|
|
| 802 | { |
|
|
| 803 | vpndata_packet *p = new vpndata_packet; |
|
|
| 804 | int tos = 0; |
|
|
| 805 | |
|
|
| 806 | if (conf->inherit_tos |
|
|
| 807 | && (*pkt)[12] == 0x08 && (*pkt)[13] == 0x00 // IP |
|
|
| 808 | && ((*pkt)[14] & 0xf0) == 0x40) // IPv4 |
|
|
| 809 | tos = (*pkt)[15] & IPTOS_TOS_MASK; |
|
|
| 810 | |
|
|
| 811 | p->setup (this, broadcast ? 0 : conf->id, &((*pkt)[6 + 6]), pkt->len - 6 - 6, ++oseqno); // skip 2 macs |
|
|
| 812 | vpn->send_vpn_packet (p, &sa, tos); |
|
|
| 813 | |
|
|
| 814 | delete p; |
|
|
| 815 | |
|
|
| 816 | if (oseqno > MAX_SEQNO) |
|
|
| 817 | rekey (); |
|
|
| 818 | } |
|
|
| 819 | |
|
|
| 820 | void |
|
|
| 821 | connection::inject_data_packet (tap_packet *pkt, bool broadcast) |
|
|
| 822 | { |
|
|
| 823 | if (ictx && octx) |
|
|
| 824 | send_data_packet (pkt, broadcast); |
|
|
| 825 | else |
|
|
| 826 | { |
|
|
| 827 | if (!broadcast)//DDDD |
|
|
| 828 | queue.put (new tap_packet (*pkt)); |
|
|
| 829 | |
|
|
| 830 | establish_connection (); |
|
|
| 831 | } |
|
|
| 832 | } |
|
|
| 833 | |
|
|
| 834 | void |
|
|
| 835 | connection::recv_vpn_packet (vpn_packet *pkt, SOCKADDR *ssa) |
|
|
| 836 | { |
|
|
| 837 | last_activity = NOW; |
|
|
| 838 | |
|
|
| 839 | slog (L_NOISE, "<<%d received packet type %d from %d to %d", |
|
|
| 840 | conf->id, pkt->typ (), pkt->src (), pkt->dst ()); |
|
|
| 841 | |
|
|
| 842 | switch (pkt->typ ()) |
|
|
| 843 | { |
|
|
| 844 | case vpn_packet::PT_PING: |
|
|
| 845 | send_ping (ssa, 1); // pong |
|
|
| 846 | break; |
|
|
| 847 | |
|
|
| 848 | case vpn_packet::PT_PONG: |
|
|
| 849 | // we send pings instead of auth packets after some retries, |
|
|
| 850 | // so reset the retry counter and establish a conenction |
|
|
| 851 | // when we receive a pong. |
|
|
| 852 | if (!ictx && !octx) |
|
|
| 853 | { |
|
|
| 854 | retry_cnt = 0; |
|
|
| 855 | establish_connection.at = 0; |
|
|
| 856 | establish_connection (); |
|
|
| 857 | } |
|
|
| 858 | |
|
|
| 859 | break; |
|
|
| 860 | |
|
|
| 861 | case vpn_packet::PT_RESET: |
|
|
| 862 | { |
|
|
| 863 | reset_connection (); |
|
|
| 864 | |
|
|
| 865 | config_packet *p = (config_packet *) pkt; |
|
|
| 866 | if (!p->chk_config ()) |
|
|
| 867 | { |
|
|
| 868 | slog (L_WARN, _("protocol mismatch, disabling node '%s'"), conf->nodename); |
|
|
| 869 | connectmode = conf_node::C_DISABLED; |
|
|
| 870 | } |
|
|
| 871 | else if (connectmode == conf_node::C_ALWAYS) |
|
|
| 872 | establish_connection (); |
|
|
| 873 | } |
|
|
| 874 | break; |
|
|
| 875 | |
|
|
| 876 | case vpn_packet::PT_AUTH: |
|
|
| 877 | { |
|
|
| 878 | auth_packet *p = (auth_packet *) pkt; |
|
|
| 879 | |
|
|
| 880 | slog (L_TRACE, "<<%d PT_AUTH(%d)", conf->id, p->subtype); |
|
|
| 881 | |
|
|
| 882 | if (p->chk_config () |
|
|
| 883 | && !strncmp (p->magic, MAGIC, 8)) |
|
|
| 884 | { |
|
|
| 885 | if (p->prot_minor != PROTOCOL_MINOR) |
|
|
| 886 | slog (L_INFO, _("protocol minor version mismatch: ours is %d, %s's is %d."), |
|
|
| 887 | PROTOCOL_MINOR, conf->nodename, p->prot_minor); |
|
|
| 888 | |
|
|
| 889 | if (p->subtype == AUTH_INIT) |
|
|
| 890 | send_auth (AUTH_INITREPLY, ssa); |
|
|
| 891 | |
|
|
| 892 | const rsachallenge *k = rsa_cache.private_decrypt (::conf.rsa_key, p->challenge); |
|
|
| 893 | |
|
|
| 894 | if (!k) |
|
|
| 895 | { |
|
|
| 896 | slog (L_ERR, _("challenge from %s (%s) illegal or corrupted"), |
|
|
| 897 | conf->nodename, (const char *)sockinfo (ssa)); |
|
|
| 898 | break; |
|
|
| 899 | } |
|
|
| 900 | |
|
|
| 901 | retry_cnt = 0; |
|
|
| 902 | establish_connection.set (NOW + 8); //? ;) |
|
|
| 903 | keepalive.reset (); |
|
|
| 904 | rekey.reset (); |
|
|
| 905 | |
|
|
| 906 | switch (p->subtype) |
|
|
| 907 | { |
|
|
| 908 | case AUTH_INIT: |
|
|
| 909 | case AUTH_INITREPLY: |
|
|
| 910 | delete ictx; |
|
|
| 911 | ictx = 0; |
|
|
| 912 | |
|
|
| 913 | delete octx; |
|
|
| 914 | |
|
|
| 915 | octx = new crypto_ctx (*k, 1); |
|
|
| 916 | oseqno = *(u32 *)&k[CHG_SEQNO] & 0x7fffffff; |
|
|
| 917 | |
|
|
| 918 | send_auth (AUTH_REPLY, ssa, k); |
|
|
| 919 | break; |
|
|
| 920 | |
|
|
| 921 | case AUTH_REPLY: |
|
|
| 922 | |
|
|
| 923 | if (!memcmp ((u8 *)gen_challenge (seqrand, ssa), (u8 *)k, sizeof (rsachallenge))) |
|
|
| 924 | { |
|
|
| 925 | delete ictx; |
|
|
| 926 | |
|
|
| 927 | ictx = new crypto_ctx (*k, 0); |
|
|
| 928 | iseqno.reset (*(u32 *)&k[CHG_SEQNO] & 0x7fffffff); // at least 2**31 sequence numbers are valid |
|
|
| 929 | |
|
|
| 930 | sa = *ssa; |
|
|
| 931 | |
|
|
| 932 | rekey.set (NOW + ::conf.rekey); |
|
|
| 933 | keepalive.set (NOW + ::conf.keepalive); |
|
|
| 934 | |
|
|
| 935 | // send queued packets |
|
|
| 936 | while (tap_packet *p = queue.get ()) |
|
|
| 937 | { |
|
|
| 938 | send_data_packet (p); |
|
|
| 939 | delete p; |
|
|
| 940 | } |
|
|
| 941 | |
|
|
| 942 | connectmode = conf->connectmode; |
|
|
| 943 | |
|
|
| 944 | slog (L_INFO, _("connection to %d (%s %s) established"), |
|
|
| 945 | conf->id, conf->nodename, (const char *)sockinfo (ssa)); |
|
|
| 946 | |
|
|
| 947 | if (::conf.script_node_up) |
|
|
| 948 | run_script (this, &connection::script_node_up, false); |
|
|
| 949 | } |
|
|
| 950 | else |
|
|
| 951 | slog (L_ERR, _("sent and received challenge do not match with (%s %s))"), |
|
|
| 952 | conf->nodename, (const char *)sockinfo (ssa)); |
|
|
| 953 | |
|
|
| 954 | break; |
|
|
| 955 | default: |
|
|
| 956 | slog (L_ERR, _("authentification illegal subtype error (%s %s)"), |
|
|
| 957 | conf->nodename, (const char *)sockinfo (ssa)); |
|
|
| 958 | break; |
|
|
| 959 | } |
|
|
| 960 | } |
|
|
| 961 | else |
|
|
| 962 | send_reset (ssa); |
|
|
| 963 | |
|
|
| 964 | break; |
|
|
| 965 | } |
|
|
| 966 | |
|
|
| 967 | case vpn_packet::PT_DATA_COMPRESSED: |
|
|
| 968 | #if !ENABLE_COMPRESSION |
|
|
| 969 | send_reset (ssa); |
|
|
| 970 | break; |
|
|
| 971 | #endif |
|
|
| 972 | case vpn_packet::PT_DATA_UNCOMPRESSED: |
|
|
| 973 | |
|
|
| 974 | if (ictx && octx) |
|
|
| 975 | { |
|
|
| 976 | vpndata_packet *p = (vpndata_packet *)pkt; |
|
|
| 977 | |
|
|
| 978 | if (*ssa == sa) |
|
|
| 979 | { |
|
|
| 980 | if (!p->hmac_chk (ictx)) |
|
|
| 981 | slog (L_ERR, _("hmac authentication error, received invalid packet\n" |
|
|
| 982 | "could be an attack, or just corruption or an synchronization error")); |
|
|
| 983 | else |
|
|
| 984 | { |
|
|
| 985 | u32 seqno; |
|
|
| 986 | tap_packet *d = p->unpack (this, seqno); |
|
|
| 987 | |
|
|
| 988 | if (iseqno.recv_ok (seqno)) |
|
|
| 989 | { |
|
|
| 990 | vpn->tap->send (d); |
|
|
| 991 | |
|
|
| 992 | if (p->dst () == 0) // re-broadcast |
|
|
| 993 | for (vpn::conns_vector::iterator i = vpn->conns.begin (); i != vpn->conns.end (); ++i) |
|
|
| 994 | { |
|
|
| 995 | connection *c = *i; |
|
|
| 996 | |
|
|
| 997 | if (c->conf != THISNODE && c->conf != conf) |
|
|
| 998 | c->inject_data_packet (d); |
|
|
| 999 | } |
|
|
| 1000 | |
|
|
| 1001 | delete d; |
|
|
| 1002 | |
|
|
| 1003 | break; |
|
|
| 1004 | } |
|
|
| 1005 | } |
|
|
| 1006 | } |
|
|
| 1007 | else |
|
|
| 1008 | slog (L_ERR, _("received data packet from unknown source %s"), (const char *)sockinfo (ssa));//D |
|
|
| 1009 | } |
|
|
| 1010 | |
|
|
| 1011 | send_reset (ssa); |
|
|
| 1012 | break; |
|
|
| 1013 | |
|
|
| 1014 | case vpn_packet::PT_CONNECT_REQ: |
|
|
| 1015 | if (ictx && octx && *ssa == sa && pkt->hmac_chk (ictx)) |
|
|
| 1016 | { |
|
|
| 1017 | connect_req_packet *p = (connect_req_packet *) pkt; |
|
|
| 1018 | |
|
|
| 1019 | assert (p->id > 0 && p->id <= vpn->conns.size ()); // hmac-auth does not mean we accept anything |
|
|
| 1020 | |
|
|
| 1021 | connection *c = vpn->conns[p->id - 1]; |
|
|
| 1022 | |
|
|
| 1023 | slog (L_TRACE, "<<%d PT_CONNECT_REQ(%d) [%d]\n", |
|
|
| 1024 | conf->id, p->id, c->ictx && c->octx); |
|
|
| 1025 | |
|
|
| 1026 | if (c->ictx && c->octx) |
|
|
| 1027 | { |
|
|
| 1028 | // send connect_info packets to both sides, in case one is |
|
|
| 1029 | // behind a nat firewall (or both ;) |
|
|
| 1030 | { |
|
|
| 1031 | sockinfo si(sa); |
|
|
| 1032 | |
|
|
| 1033 | slog (L_TRACE, ">>%d PT_CONNECT_INFO(%d,%s)\n", |
|
|
| 1034 | c->conf->id, conf->id, (const char *)si); |
|
|
| 1035 | |
|
|
| 1036 | connect_info_packet *r = new connect_info_packet (c->conf->id, conf->id, si); |
|
|
| 1037 | |
|
|
| 1038 | r->hmac_set (c->octx); |
|
|
| 1039 | vpn->send_vpn_packet (r, &c->sa); |
|
|
| 1040 | |
|
|
| 1041 | delete r; |
|
|
| 1042 | } |
|
|
| 1043 | |
|
|
| 1044 | { |
|
|
| 1045 | sockinfo si(c->sa); |
|
|
| 1046 | |
|
|
| 1047 | slog (L_TRACE, ">>%d PT_CONNECT_INFO(%d,%s)\n", |
|
|
| 1048 | conf->id, c->conf->id, (const char *)si); |
|
|
| 1049 | |
|
|
| 1050 | connect_info_packet *r = new connect_info_packet (conf->id, c->conf->id, si); |
|
|
| 1051 | |
|
|
| 1052 | r->hmac_set (octx); |
|
|
| 1053 | vpn->send_vpn_packet (r, &sa); |
|
|
| 1054 | |
|
|
| 1055 | delete r; |
|
|
| 1056 | } |
|
|
| 1057 | } |
|
|
| 1058 | } |
|
|
| 1059 | |
|
|
| 1060 | break; |
|
|
| 1061 | |
|
|
| 1062 | case vpn_packet::PT_CONNECT_INFO: |
|
|
| 1063 | if (ictx && octx && *ssa == sa && pkt->hmac_chk (ictx)) |
|
|
| 1064 | { |
|
|
| 1065 | connect_info_packet *p = (connect_info_packet *) pkt; |
|
|
| 1066 | |
|
|
| 1067 | assert (p->id > 0 && p->id <= vpn->conns.size ()); // hmac-auth does not mean we accept anything |
|
|
| 1068 | |
|
|
| 1069 | connection *c = vpn->conns[p->id - 1]; |
|
|
| 1070 | |
|
|
| 1071 | slog (L_TRACE, "<<%d PT_CONNECT_INFO(%d,%s) (%d)", |
|
|
| 1072 | conf->id, p->id, (const char *)p->si, !c->ictx && !c->octx); |
|
|
| 1073 | |
|
|
| 1074 | c->send_auth (AUTH_INIT, p->si.sa ()); |
|
|
| 1075 | } |
|
|
| 1076 | break; |
|
|
| 1077 | |
|
|
| 1078 | default: |
|
|
| 1079 | send_reset (ssa); |
|
|
| 1080 | break; |
|
|
| 1081 | } |
|
|
| 1082 | } |
|
|
| 1083 | |
|
|
| 1084 | void connection::keepalive_cb (tstamp &ts) |
|
|
| 1085 | { |
|
|
| 1086 | if (NOW >= last_activity + ::conf.keepalive + 30) |
|
|
| 1087 | { |
|
|
| 1088 | reset_connection (); |
|
|
| 1089 | establish_connection (); |
|
|
| 1090 | } |
|
|
| 1091 | else if (NOW < last_activity + ::conf.keepalive) |
|
|
| 1092 | ts = last_activity + ::conf.keepalive; |
|
|
| 1093 | else if (conf->connectmode != conf_node::C_ONDEMAND |
|
|
| 1094 | || THISNODE->connectmode != conf_node::C_ONDEMAND) |
|
|
| 1095 | { |
|
|
| 1096 | send_ping (&sa); |
|
|
| 1097 | ts = NOW + 5; |
|
|
| 1098 | } |
|
|
| 1099 | else |
|
|
| 1100 | reset_connection (); |
|
|
| 1101 | |
|
|
| 1102 | } |
|
|
| 1103 | |
|
|
| 1104 | void connection::connect_request (int id) |
|
|
| 1105 | { |
|
|
| 1106 | connect_req_packet *p = new connect_req_packet (conf->id, id); |
|
|
| 1107 | |
|
|
| 1108 | slog (L_TRACE, ">>%d PT_CONNECT_REQ(%d)", id, conf->id); |
|
|
| 1109 | p->hmac_set (octx); |
|
|
| 1110 | vpn->send_vpn_packet (p, &sa); |
|
|
| 1111 | |
|
|
| 1112 | delete p; |
|
|
| 1113 | } |
|
|
| 1114 | |
|
|
| 1115 | void connection::script_node () |
|
|
| 1116 | { |
|
|
| 1117 | vpn->script_if_up (); |
|
|
| 1118 | |
|
|
| 1119 | char *env; |
|
|
| 1120 | asprintf (&env, "DESTID=%d", conf->id); |
|
|
| 1121 | putenv (env); |
|
|
| 1122 | asprintf (&env, "DESTNODE=%s", conf->nodename); |
|
|
| 1123 | putenv (env); |
|
|
| 1124 | asprintf (&env, "DESTIP=%s", inet_ntoa (sa.sin_addr)); |
|
|
| 1125 | putenv (env); |
|
|
| 1126 | asprintf (&env, "DESTPORT=%d", ntohs (sa.sin_port)); |
|
|
| 1127 | putenv (env); |
|
|
| 1128 | } |
|
|
| 1129 | |
|
|
| 1130 | const char *connection::script_node_up () |
|
|
| 1131 | { |
|
|
| 1132 | script_node (); |
|
|
| 1133 | |
|
|
| 1134 | putenv ("STATE=up"); |
|
|
| 1135 | |
|
|
| 1136 | return ::conf.script_node_up ? ::conf.script_node_up : "node-up"; |
|
|
| 1137 | } |
|
|
| 1138 | |
|
|
| 1139 | const char *connection::script_node_down () |
|
|
| 1140 | { |
|
|
| 1141 | script_node (); |
|
|
| 1142 | |
|
|
| 1143 | putenv ("STATE=down"); |
|
|
| 1144 | |
|
|
| 1145 | return ::conf.script_node_up ? ::conf.script_node_down : "node-down"; |
|
|
| 1146 | } |
|
|
| 1147 | |
|
|
| 1148 | connection::connection(struct vpn *vpn_) |
|
|
| 1149 | : vpn(vpn_) |
|
|
| 1150 | , rekey (this, &connection::rekey_cb) |
|
|
| 1151 | , keepalive (this, &connection::keepalive_cb) |
|
|
| 1152 | , establish_connection (this, &connection::establish_connection_cb) |
|
|
| 1153 | { |
|
|
| 1154 | octx = ictx = 0; |
|
|
| 1155 | retry_cnt = 0; |
|
|
| 1156 | |
|
|
| 1157 | connectmode = conf_node::C_ALWAYS; // initial setting |
|
|
| 1158 | reset_connection (); |
|
|
| 1159 | } |
|
|
| 1160 | |
|
|
| 1161 | connection::~connection () |
|
|
| 1162 | { |
|
|
| 1163 | shutdown (); |
|
|
| 1164 | } |
|
|
| 1165 | |
|
|
| 1166 | ///////////////////////////////////////////////////////////////////////////// |
|
|
| 1167 | |
|
|
| 1168 | const char *vpn::script_if_up () |
45 | const char *vpn::script_if_up (int) |
| 1169 | { |
46 | { |
| 1170 | // the tunnel device mtu should be the physical mtu - overhead |
47 | // the tunnel device mtu should be the physical mtu - overhead |
| 1171 | // the tricky part is rounding to the cipher key blocksize |
48 | // the tricky part is rounding to the cipher key blocksize |
| 1172 | int mtu = conf.mtu - ETH_OVERHEAD - VPE_OVERHEAD - UDP_OVERHEAD; |
49 | int mtu = conf.mtu - ETH_OVERHEAD - VPE_OVERHEAD - MAX_OVERHEAD; |
| 1173 | mtu += ETH_OVERHEAD - 6 - 6; // now we have the data portion |
50 | mtu += ETH_OVERHEAD - 6 - 6; // now we have the data portion |
| 1174 | mtu -= mtu % EVP_CIPHER_block_size (CIPHER); // round |
51 | mtu -= mtu % EVP_CIPHER_block_size (CIPHER); // round |
| 1175 | mtu -= ETH_OVERHEAD - 6 - 6; // and get interface mtu again |
52 | mtu -= ETH_OVERHEAD - 6 - 6; // and get interface mtu again |
| 1176 | |
53 | |
| 1177 | char *env; |
54 | char *env; |
| … | |
… | |
| 1192 | |
69 | |
| 1193 | return ::conf.script_if_up ? ::conf.script_if_up : "if-up"; |
70 | return ::conf.script_if_up ? ::conf.script_if_up : "if-up"; |
| 1194 | } |
71 | } |
| 1195 | |
72 | |
| 1196 | int |
73 | int |
| 1197 | vpn::setup (void) |
74 | vpn::setup () |
| 1198 | { |
75 | { |
| 1199 | struct sockaddr_in sa; |
76 | sockinfo si; |
| 1200 | |
77 | |
|
|
78 | si.set (THISNODE); |
|
|
79 | |
|
|
80 | udpv4_fd = -1; |
|
|
81 | |
|
|
82 | if (THISNODE->protocols & PROT_UDPv4) |
|
|
83 | { |
| 1201 | socket_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP); |
84 | udpv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP); |
| 1202 | if (socket_fd < 0) |
85 | |
|
|
86 | if (udpv4_fd < 0) |
| 1203 | return -1; |
87 | return -1; |
| 1204 | |
88 | |
| 1205 | fill_sa (&sa, THISNODE); |
89 | if (bind (udpv4_fd, si.sav4 (), si.salenv4 ())) |
| 1206 | |
90 | { |
| 1207 | if (bind (socket_fd, (sockaddr *)&sa, sizeof (sa))) |
|
|
| 1208 | { |
|
|
| 1209 | slog (L_ERR, _("can't bind to %s: %s"), (const char *)sockinfo(sa), strerror (errno)); |
91 | slog (L_ERR, _("can't bind udpv4 to %s: %s"), (const char *)si, strerror (errno)); |
| 1210 | exit (1); |
92 | exit (1); |
| 1211 | } |
93 | } |
| 1212 | |
94 | |
| 1213 | #ifdef IP_MTU_DISCOVER |
95 | #ifdef IP_MTU_DISCOVER |
| 1214 | // this I really consider a linux bug. I am neither connected |
96 | // this I really consider a linux bug. I am neither connected |
| 1215 | // nor do I fragment myself. Linux still sets DF and doesn't |
97 | // nor do I fragment myself. Linux still sets DF and doesn't |
| 1216 | // fragment for me sometimes. |
98 | // fragment for me sometimes. |
| 1217 | { |
99 | { |
| 1218 | int oval = IP_PMTUDISC_DONT; |
100 | int oval = IP_PMTUDISC_DONT; |
| 1219 | setsockopt (socket_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval); |
101 | setsockopt (udpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval); |
| 1220 | } |
102 | } |
| 1221 | #endif |
103 | #endif |
| 1222 | { |
104 | |
|
|
105 | // standard daemon practise... |
|
|
106 | { |
| 1223 | int oval = 1; |
107 | int oval = 1; |
| 1224 | setsockopt (socket_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval); |
108 | setsockopt (udpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval); |
| 1225 | } |
109 | } |
| 1226 | |
110 | |
| 1227 | udp_ev_watcher.start (socket_fd, POLLIN); |
111 | udpv4_ev_watcher.start (udpv4_fd, POLLIN); |
|
|
112 | } |
|
|
113 | |
|
|
114 | ipv4_fd = -1; |
|
|
115 | if (THISNODE->protocols & PROT_IPv4) |
|
|
116 | { |
|
|
117 | ipv4_fd = socket (PF_INET, SOCK_RAW, ::conf.ip_proto); |
|
|
118 | |
|
|
119 | if (ipv4_fd < 0) |
|
|
120 | return -1; |
|
|
121 | |
|
|
122 | if (bind (ipv4_fd, si.sav4 (), si.salenv4 ())) |
|
|
123 | { |
|
|
124 | slog (L_ERR, _("can't bind ipv4 socket to %s: %s"), (const char *)si, strerror (errno)); |
|
|
125 | exit (1); |
|
|
126 | } |
|
|
127 | |
|
|
128 | #ifdef IP_MTU_DISCOVER |
|
|
129 | // this I really consider a linux bug. I am neither connected |
|
|
130 | // nor do I fragment myself. Linux still sets DF and doesn't |
|
|
131 | // fragment for me sometimes. |
|
|
132 | { |
|
|
133 | int oval = IP_PMTUDISC_DONT; |
|
|
134 | setsockopt (ipv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval); |
|
|
135 | } |
|
|
136 | #endif |
|
|
137 | |
|
|
138 | ipv4_ev_watcher.start (ipv4_fd, POLLIN); |
|
|
139 | } |
| 1228 | |
140 | |
| 1229 | tap = new tap_device (); |
141 | tap = new tap_device (); |
| 1230 | if (!tap) //D this, of course, never catches |
142 | if (!tap) //D this, of course, never catches |
| 1231 | { |
143 | { |
| 1232 | slog (L_ERR, _("cannot create network interface '%s'"), conf.ifname); |
144 | slog (L_ERR, _("cannot create network interface '%s'"), conf.ifname); |
| 1233 | exit (1); |
145 | exit (1); |
| 1234 | } |
146 | } |
| 1235 | |
147 | |
| 1236 | run_script (this, &vpn::script_if_up, true); |
148 | run_script (run_script_cb (this, &vpn::script_if_up), true); |
| 1237 | |
149 | |
| 1238 | vpn_ev_watcher.start (tap->fd, POLLIN); |
150 | tap_ev_watcher.start (tap->fd, POLLIN); |
| 1239 | |
151 | |
| 1240 | reconnect_all (); |
152 | reconnect_all (); |
| 1241 | |
153 | |
| 1242 | return 0; |
154 | return 0; |
| 1243 | } |
155 | } |
| 1244 | |
156 | |
| 1245 | void |
157 | void |
| 1246 | vpn::send_vpn_packet (vpn_packet *pkt, SOCKADDR *sa, int tos) |
158 | vpn::send_ipv4_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
| 1247 | { |
159 | { |
| 1248 | setsockopt (socket_fd, SOL_IP, IP_TOS, &tos, sizeof tos); |
160 | setsockopt (ipv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos); |
| 1249 | sendto (socket_fd, &((*pkt)[0]), pkt->len, 0, (sockaddr *)sa, sizeof (*sa)); |
161 | sendto (ipv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ()); |
| 1250 | } |
162 | } |
| 1251 | |
163 | |
| 1252 | void |
164 | void |
| 1253 | vpn::shutdown_all () |
165 | vpn::send_udpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
| 1254 | { |
166 | { |
| 1255 | for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c) |
167 | setsockopt (udpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos); |
| 1256 | (*c)->shutdown (); |
168 | sendto (udpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ()); |
| 1257 | } |
169 | } |
| 1258 | |
170 | |
| 1259 | void |
171 | void |
| 1260 | vpn::reconnect_all () |
172 | vpn::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi) |
| 1261 | { |
173 | { |
| 1262 | for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c) |
174 | unsigned int src = pkt->src (); |
| 1263 | delete *c; |
175 | unsigned int dst = pkt->dst (); |
| 1264 | |
176 | |
| 1265 | conns.clear (); |
177 | slog (L_NOISE, _("<<?/%s received possible vpn packet type %d from %d to %d, length %d"), |
|
|
178 | (const char *)rsi, pkt->typ (), pkt->src (), pkt->dst (), pkt->len); |
| 1266 | |
179 | |
| 1267 | for (configuration::node_vector::iterator i = conf.nodes.begin (); |
180 | if (src == 0 || src > conns.size () |
| 1268 | i != conf.nodes.end (); ++i) |
181 | || dst > conns.size () |
| 1269 | { |
182 | || pkt->typ () >= vpn_packet::PT_MAX) |
| 1270 | connection *conn = new connection (this); |
183 | slog (L_WARN, _("(%s): received corrupted packet type %d (src %d, dst %d)"), |
| 1271 | |
184 | (const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ()); |
| 1272 | conn->conf = *i; |
185 | else |
| 1273 | conns.push_back (conn); |
|
|
| 1274 | |
|
|
| 1275 | conn->establish_connection (); |
|
|
| 1276 | } |
186 | { |
| 1277 | } |
187 | connection *c = conns[src - 1]; |
| 1278 | |
188 | |
| 1279 | connection *vpn::find_router () |
189 | if (dst == 0 && !THISNODE->routerprio) |
| 1280 | { |
190 | slog (L_WARN, _("%s(%s): received broadcast, but we are no router"), |
| 1281 | u32 prio = 0; |
191 | c->conf->nodename, (const char *)rsi); |
| 1282 | connection *router = 0; |
192 | else if (dst != 0 && dst != THISNODE->id) |
| 1283 | |
193 | // FORWARDING NEEDED ;) |
| 1284 | for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i) |
194 | slog (L_WARN, |
|
|
195 | _("received frame for node %d ('%s') from %s, but this is node %d ('%s')"), |
|
|
196 | dst, conns[dst - 1]->conf->nodename, |
|
|
197 | (const char *)rsi, |
|
|
198 | THISNODE->id, THISNODE->nodename); |
|
|
199 | else |
|
|
200 | c->recv_vpn_packet (pkt, rsi); |
| 1285 | { |
201 | } |
| 1286 | connection *c = *i; |
|
|
| 1287 | |
|
|
| 1288 | if (c->conf->routerprio > prio |
|
|
| 1289 | && c->connectmode == conf_node::C_ALWAYS |
|
|
| 1290 | && c->conf != THISNODE |
|
|
| 1291 | && c->ictx && c->octx) |
|
|
| 1292 | { |
|
|
| 1293 | prio = c->conf->routerprio; |
|
|
| 1294 | router = c; |
|
|
| 1295 | } |
|
|
| 1296 | } |
|
|
| 1297 | |
|
|
| 1298 | return router; |
|
|
| 1299 | } |
202 | } |
| 1300 | |
203 | |
| 1301 | void vpn::connect_request (int id) |
|
|
| 1302 | { |
|
|
| 1303 | connection *c = find_router (); |
|
|
| 1304 | |
|
|
| 1305 | if (c) |
|
|
| 1306 | c->connect_request (id); |
|
|
| 1307 | //else // does not work, because all others must connect to the same router |
|
|
| 1308 | // // no router found, aggressively connect to all routers |
|
|
| 1309 | // for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i) |
|
|
| 1310 | // if ((*i)->conf->routerprio) |
|
|
| 1311 | // (*i)->establish_connection (); |
|
|
| 1312 | } |
|
|
| 1313 | |
|
|
| 1314 | void |
204 | void |
| 1315 | vpn::udp_ev (short revents) |
205 | vpn::udpv4_ev (short revents) |
| 1316 | { |
206 | { |
| 1317 | if (revents & (POLLIN | POLLERR)) |
207 | if (revents & (POLLIN | POLLERR)) |
| 1318 | { |
208 | { |
| 1319 | vpn_packet *pkt = new vpn_packet; |
209 | vpn_packet *pkt = new vpn_packet; |
| 1320 | struct sockaddr_in sa; |
210 | struct sockaddr_in sa; |
| 1321 | socklen_t sa_len = sizeof (sa); |
211 | socklen_t sa_len = sizeof (sa); |
| 1322 | int len; |
212 | int len; |
| 1323 | |
213 | |
| 1324 | len = recvfrom (socket_fd, &((*pkt)[0]), MAXSIZE, 0, (sockaddr *)&sa, &sa_len); |
214 | len = recvfrom (udpv4_fd, &((*pkt)[0]), MAXSIZE, 0, (sockaddr *)&sa, &sa_len); |
|
|
215 | |
|
|
216 | sockinfo si(sa); |
| 1325 | |
217 | |
| 1326 | if (len > 0) |
218 | if (len > 0) |
| 1327 | { |
219 | { |
| 1328 | pkt->len = len; |
220 | pkt->len = len; |
| 1329 | |
221 | |
| 1330 | unsigned int src = pkt->src (); |
|
|
| 1331 | unsigned int dst = pkt->dst (); |
|
|
| 1332 | |
|
|
| 1333 | slog (L_NOISE, _("<<?/%s received possible vpn packet type %d from %d to %d, length %d"), |
|
|
| 1334 | (const char *)sockinfo (sa), pkt->typ (), pkt->src (), pkt->dst (), pkt->len); |
|
|
| 1335 | |
|
|
| 1336 | if (dst > conns.size () || pkt->typ () >= vpn_packet::PT_MAX) |
|
|
| 1337 | slog (L_WARN, _("<<? received CORRUPTED packet type %d from %d to %d"), |
|
|
| 1338 | pkt->typ (), pkt->src (), pkt->dst ()); |
|
|
| 1339 | else if (dst == 0 && !THISNODE->routerprio) |
|
|
| 1340 | slog (L_WARN, _("<<%d received broadcast, but we are no router"), dst); |
|
|
| 1341 | else if (dst != 0 && dst != THISNODE->id) |
|
|
| 1342 | slog (L_WARN, |
|
|
| 1343 | _("received frame for node %d ('%s') from %s, but this is node %d ('%s')"), |
|
|
| 1344 | dst, conns[dst - 1]->conf->nodename, |
|
|
| 1345 | (const char *)sockinfo (sa), |
|
|
| 1346 | THISNODE->id, THISNODE->nodename); |
|
|
| 1347 | else if (src == 0 || src > conns.size ()) |
|
|
| 1348 | slog (L_WARN, _("received frame from unknown node %d (%s)"), src, (const char *)sockinfo (sa)); |
|
|
| 1349 | else |
|
|
| 1350 | conns[src - 1]->recv_vpn_packet (pkt, &sa); |
222 | recv_vpn_packet (pkt, si); |
| 1351 | } |
223 | } |
| 1352 | else |
224 | else |
| 1353 | { |
225 | { |
| 1354 | // probably ECONNRESET or somesuch |
226 | // probably ECONNRESET or somesuch |
| 1355 | slog (L_DEBUG, _("%s: %s"), (const char *)sockinfo(sa), strerror (errno)); |
227 | slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno)); |
| 1356 | } |
228 | } |
| 1357 | |
229 | |
| 1358 | delete pkt; |
230 | delete pkt; |
| 1359 | } |
231 | } |
| 1360 | else if (revents & POLLHUP) |
232 | else if (revents & POLLHUP) |
| 1361 | { |
233 | { |
| 1362 | // this cannot ;) happen on udp sockets |
234 | // this cannot ;) happen on udp sockets |
| 1363 | slog (L_ERR, _("FATAL: POLLHUP on socket fd, terminating.")); |
235 | slog (L_ERR, _("FATAL: POLLHUP on udp v4 fd, terminating.")); |
| 1364 | exit (1); |
236 | exit (1); |
| 1365 | } |
237 | } |
| 1366 | else |
238 | else |
| 1367 | { |
239 | { |
| 1368 | slog (L_ERR, |
240 | slog (L_ERR, |
| … | |
… | |
| 1371 | exit (1); |
243 | exit (1); |
| 1372 | } |
244 | } |
| 1373 | } |
245 | } |
| 1374 | |
246 | |
| 1375 | void |
247 | void |
|
|
248 | vpn::ipv4_ev (short revents) |
|
|
249 | { |
|
|
250 | if (revents & (POLLIN | POLLERR)) |
|
|
251 | { |
|
|
252 | vpn_packet *pkt = new vpn_packet; |
|
|
253 | struct sockaddr_in sa; |
|
|
254 | socklen_t sa_len = sizeof (sa); |
|
|
255 | int len; |
|
|
256 | |
|
|
257 | len = recvfrom (ipv4_fd, &((*pkt)[0]), MAXSIZE, 0, (sockaddr *)&sa, &sa_len); |
|
|
258 | |
|
|
259 | sockinfo si(sa, PROT_IPv4); |
|
|
260 | |
|
|
261 | if (len > 0) |
|
|
262 | { |
|
|
263 | pkt->len = len; |
|
|
264 | |
|
|
265 | // raw sockets deliver the ipv4, but don't expect it on sends |
|
|
266 | // this is slow, but... |
|
|
267 | pkt->skip_hdr (IP_OVERHEAD); |
|
|
268 | |
|
|
269 | recv_vpn_packet (pkt, si); |
|
|
270 | } |
|
|
271 | else |
|
|
272 | { |
|
|
273 | // probably ECONNRESET or somesuch |
|
|
274 | slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno)); |
|
|
275 | } |
|
|
276 | |
|
|
277 | delete pkt; |
|
|
278 | } |
|
|
279 | else if (revents & POLLHUP) |
|
|
280 | { |
|
|
281 | // this cannot ;) happen on udp sockets |
|
|
282 | slog (L_ERR, _("FATAL: POLLHUP on ipv4 fd, terminating.")); |
|
|
283 | exit (1); |
|
|
284 | } |
|
|
285 | else |
|
|
286 | { |
|
|
287 | slog (L_ERR, |
|
|
288 | _("FATAL: unknown revents %08x in socket, terminating\n"), |
|
|
289 | revents); |
|
|
290 | exit (1); |
|
|
291 | } |
|
|
292 | } |
|
|
293 | |
|
|
294 | void |
| 1376 | vpn::vpn_ev (short revents) |
295 | vpn::tap_ev (short revents) |
| 1377 | { |
296 | { |
| 1378 | if (revents & POLLIN) |
297 | if (revents & POLLIN) |
| 1379 | { |
298 | { |
| 1380 | /* process data */ |
299 | /* process data */ |
| 1381 | tap_packet *pkt; |
300 | tap_packet *pkt; |
| … | |
… | |
| 1437 | { |
356 | { |
| 1438 | if (events) |
357 | if (events) |
| 1439 | { |
358 | { |
| 1440 | if (events & EVENT_SHUTDOWN) |
359 | if (events & EVENT_SHUTDOWN) |
| 1441 | { |
360 | { |
|
|
361 | slog (L_INFO, _("preparing shutdown...")); |
|
|
362 | |
| 1442 | shutdown_all (); |
363 | shutdown_all (); |
| 1443 | |
364 | |
| 1444 | remove_pid (pidfilename); |
365 | remove_pid (pidfilename); |
| 1445 | |
366 | |
| 1446 | slog (L_INFO, _("vped terminating")); |
367 | slog (L_INFO, _("terminating")); |
| 1447 | |
368 | |
| 1448 | exit (0); |
369 | exit (0); |
| 1449 | } |
370 | } |
| 1450 | |
371 | |
| 1451 | if (events & EVENT_RECONNECT) |
372 | if (events & EVENT_RECONNECT) |
|
|
373 | { |
|
|
374 | slog (L_INFO, _("forced reconnect")); |
|
|
375 | |
| 1452 | reconnect_all (); |
376 | reconnect_all (); |
|
|
377 | } |
| 1453 | |
378 | |
| 1454 | events = 0; |
379 | events = 0; |
| 1455 | } |
380 | } |
| 1456 | |
381 | |
| 1457 | ts = TSTAMP_CANCEL; |
382 | ts = TSTAMP_CANCEL; |
| 1458 | } |
383 | } |
| 1459 | |
384 | |
|
|
385 | void |
|
|
386 | vpn::shutdown_all () |
|
|
387 | { |
|
|
388 | for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c) |
|
|
389 | (*c)->shutdown (); |
|
|
390 | } |
|
|
391 | |
|
|
392 | void |
|
|
393 | vpn::reconnect_all () |
|
|
394 | { |
|
|
395 | for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c) |
|
|
396 | delete *c; |
|
|
397 | |
|
|
398 | conns.clear (); |
|
|
399 | |
|
|
400 | connection_init (); |
|
|
401 | |
|
|
402 | for (configuration::node_vector::iterator i = conf.nodes.begin (); |
|
|
403 | i != conf.nodes.end (); ++i) |
|
|
404 | { |
|
|
405 | connection *conn = new connection (this); |
|
|
406 | |
|
|
407 | conn->conf = *i; |
|
|
408 | conns.push_back (conn); |
|
|
409 | |
|
|
410 | conn->establish_connection (); |
|
|
411 | } |
|
|
412 | } |
|
|
413 | |
|
|
414 | connection *vpn::find_router () |
|
|
415 | { |
|
|
416 | u32 prio = 0; |
|
|
417 | connection *router = 0; |
|
|
418 | |
|
|
419 | for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i) |
|
|
420 | { |
|
|
421 | connection *c = *i; |
|
|
422 | |
|
|
423 | if (c->conf->routerprio > prio |
|
|
424 | && c->connectmode == conf_node::C_ALWAYS |
|
|
425 | && c->conf != THISNODE |
|
|
426 | && c->ictx && c->octx) |
|
|
427 | { |
|
|
428 | prio = c->conf->routerprio; |
|
|
429 | router = c; |
|
|
430 | } |
|
|
431 | } |
|
|
432 | |
|
|
433 | return router; |
|
|
434 | } |
|
|
435 | |
|
|
436 | void vpn::connect_request (int id) |
|
|
437 | { |
|
|
438 | connection *c = find_router (); |
|
|
439 | |
|
|
440 | if (c) |
|
|
441 | c->connect_request (id); |
|
|
442 | //else // does not work, because all others must connect to the same router |
|
|
443 | // // no router found, aggressively connect to all routers |
|
|
444 | // for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i) |
|
|
445 | // if ((*i)->conf->routerprio) |
|
|
446 | // (*i)->establish_connection (); |
|
|
447 | } |
|
|
448 | |
|
|
449 | void |
|
|
450 | connection::dump_status () |
|
|
451 | { |
|
|
452 | slog (L_NOTICE, _("node %s (id %d)"), conf->nodename, conf->id); |
|
|
453 | slog (L_NOTICE, _(" connectmode %d (%d) / sockaddr %s / minor %d"), |
|
|
454 | connectmode, conf->connectmode, (const char *)si, (int)prot_minor); |
|
|
455 | slog (L_NOTICE, _(" ictx/octx %08lx/%08lx / oseqno %d / retry_cnt %d"), |
|
|
456 | (long)ictx, (long)octx, (int)oseqno, (int)retry_cnt); |
|
|
457 | slog (L_NOTICE, _(" establish_conn %ld / rekey %ld / keepalive %ld"), |
|
|
458 | (long)(establish_connection.at), (long)(rekey.at), (long)(keepalive.at)); |
|
|
459 | } |
|
|
460 | |
|
|
461 | void |
|
|
462 | vpn::dump_status () |
|
|
463 | { |
|
|
464 | slog (L_NOTICE, _("BEGIN status dump (%ld)"), (long)NOW); |
|
|
465 | |
|
|
466 | for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c) |
|
|
467 | (*c)->dump_status (); |
|
|
468 | |
|
|
469 | slog (L_NOTICE, _("END status dump")); |
|
|
470 | } |
|
|
471 | |
| 1460 | vpn::vpn (void) |
472 | vpn::vpn (void) |
| 1461 | : udp_ev_watcher (this, &vpn::udp_ev) |
473 | : udpv4_ev_watcher(this, &vpn::udpv4_ev) |
|
|
474 | , ipv4_ev_watcher(this, &vpn::ipv4_ev) |
| 1462 | , vpn_ev_watcher (this, &vpn::vpn_ev) |
475 | , tap_ev_watcher(this, &vpn::tap_ev) |
| 1463 | , event (this, &vpn::event_cb) |
476 | , event(this, &vpn::event_cb) |
| 1464 | { |
477 | { |
| 1465 | } |
478 | } |
| 1466 | |
479 | |
| 1467 | vpn::~vpn () |
480 | vpn::~vpn () |
| 1468 | { |
481 | { |
