| 1 | /* This file is part of the Linux Trace Toolkit viewer |
| 2 | * Copyright (C) 2009 Benjamin Poirier <benjamin.poirier@polymtl.ca> |
| 3 | * |
| 4 | * This program is free software; you can redistribute it and/or modify |
| 5 | * it under the terms of the GNU General Public License Version 2 as |
| 6 | * published by the Free Software Foundation; |
| 7 | * |
| 8 | * This program is distributed in the hope that it will be useful, |
| 9 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 11 | * GNU General Public License for more details. |
| 12 | * |
| 13 | * You should have received a copy of the GNU General Public License |
| 14 | * along with this program; if not, write to the Free Software |
| 15 | * Foundation, Inc., 59 Temple Place - Suite 330, Boston, |
| 16 | * MA 02111-1307, USA. |
| 17 | */ |
| 18 | |
| 19 | #ifdef HAVE_CONFIG_H |
| 20 | #include <config.h> |
| 21 | #endif |
| 22 | |
| 23 | #include <arpa/inet.h> |
| 24 | #include <glib.h> |
| 25 | #include <stdint.h> |
| 26 | #include <stdio.h> |
| 27 | #include <stdlib.h> |
| 28 | #include <string.h> |
| 29 | |
| 30 | #include <unistd.h> |
| 31 | |
| 32 | #include "lookup3.h" |
| 33 | |
| 34 | #include "data_structures.h" |
| 35 | |
| 36 | |
| 37 | #ifndef g_info |
| 38 | #define g_info(format...) g_log (G_LOG_DOMAIN, G_LOG_LEVEL_INFO, format) |
| 39 | #endif |
| 40 | |
| 41 | // TCP sequence numbers use clock arithmetic, these comparison functions take |
| 42 | // that into account |
| 43 | #define SEQ_LT(a,b) ((int32_t)((a)-(b)) < 0) |
| 44 | #define SEQ_LEQ(a,b) ((int32_t)((a)-(b)) <= 0) |
| 45 | #define SEQ_GT(a,b) ((int32_t)((a)-(b)) > 0) |
| 46 | #define SEQ_GEQ(a,b) ((int32_t)((a)-(b)) >= 0) |
| 47 | |
| 48 | |
| 49 | /* |
| 50 | * Compare two ConnectionKey structures |
| 51 | * |
| 52 | * Returns: |
| 53 | * true if each field of the structure is equal |
| 54 | * false otherwise |
| 55 | */ |
| 56 | bool connectionKeyEqual(const ConnectionKey* const a, const |
| 57 | ConnectionKey* const b) |
| 58 | { |
| 59 | if (a->saddr == b->saddr && a->daddr == b->daddr && a->source == b->source |
| 60 | && a->dest == b->dest) |
| 61 | { |
| 62 | return true; |
| 63 | } |
| 64 | else |
| 65 | { |
| 66 | return false; |
| 67 | } |
| 68 | } |
| 69 | |
| 70 | |
| 71 | /* |
| 72 | * Check if a packet is an acknowledge of another packet. |
| 73 | * |
| 74 | * Args: |
| 75 | * ackSegment packet that is the confirmation |
| 76 | * ackedSegment packet that contains the original data, both packets have to |
| 77 | * come from the same direction of the same connection. Both |
| 78 | * messages have to contain TCP events. |
| 79 | */ |
| 80 | bool isAcking(const Message* const ackSegment, const Message* const |
| 81 | ackedSegment) |
| 82 | { |
| 83 | g_assert(ackSegment->inE->type == TCP); |
| 84 | g_assert(ackSegment->outE->type == TCP); |
| 85 | |
| 86 | if (SEQ_GT(ackSegment->inE->event.tcpEvent->segmentKey->ack_seq, |
| 87 | ackedSegment->inE->event.tcpEvent->segmentKey->seq)) |
| 88 | { |
| 89 | return true; |
| 90 | } |
| 91 | else |
| 92 | { |
| 93 | return false; |
| 94 | } |
| 95 | } |
| 96 | |
| 97 | |
| 98 | /* |
| 99 | * Convert an IP address from 32 bit form to dotted quad |
| 100 | * |
| 101 | * Args: |
| 102 | * str: A preallocated string of length >= 17 |
| 103 | * addr: Address |
| 104 | */ |
| 105 | void convertIP(char* const str, const uint32_t addr) |
| 106 | { |
| 107 | struct in_addr iaddr; |
| 108 | |
| 109 | iaddr.s_addr= htonl(addr); |
| 110 | strcpy(str, inet_ntoa(iaddr)); |
| 111 | } |
| 112 | |
| 113 | |
| 114 | /* |
| 115 | * Print the content of a TCP Message structure |
| 116 | */ |
| 117 | void printTCPSegment(const Message* const segment) |
| 118 | { |
| 119 | char saddr[17], daddr[17]; |
| 120 | SegmentKey* segmentKey; |
| 121 | |
| 122 | g_assert(segment->inE->type == TCP); |
| 123 | g_assert(segment->inE->event.tcpEvent->segmentKey == |
| 124 | segment->outE->event.tcpEvent->segmentKey); |
| 125 | |
| 126 | segmentKey= segment->inE->event.tcpEvent->segmentKey; |
| 127 | |
| 128 | convertIP(saddr, segmentKey->connectionKey.saddr); |
| 129 | convertIP(daddr, segmentKey->connectionKey.daddr); |
| 130 | g_debug("%s:%u to %s:%u tot_len: %u ihl: %u seq: %u ack_seq: %u doff: %u " |
| 131 | "ack: %u rst: %u syn: %u fin: %u", saddr, |
| 132 | segmentKey->connectionKey.source, daddr, segmentKey->connectionKey.dest, |
| 133 | segmentKey->tot_len, segmentKey->ihl, segmentKey->seq, |
| 134 | segmentKey->ack_seq, segmentKey->doff, segmentKey->ack, segmentKey->rst, |
| 135 | segmentKey->syn, segmentKey->fin); |
| 136 | } |
| 137 | |
| 138 | |
| 139 | /* |
| 140 | * A GHashFunc for g_hash_table_new() |
| 141 | * |
| 142 | * This function is for indexing TCPEvents in unMatched lists. All fields of |
| 143 | * the corresponding SegmentKey must match for two keys to be equal. |
| 144 | * |
| 145 | * Args: |
| 146 | * key SegmentKey* |
| 147 | * |
| 148 | * Returns: |
| 149 | * A hash of all fields in the SegmentKey |
| 150 | */ |
| 151 | guint ghfSegmentKeyHash(gconstpointer key) |
| 152 | { |
| 153 | const SegmentKey* p; |
| 154 | uint32_t a, b, c; |
| 155 | |
| 156 | p= (SegmentKey*) key; |
| 157 | |
| 158 | a= p->connectionKey.source + (p->connectionKey.dest << 16); |
| 159 | b= p->connectionKey.saddr; |
| 160 | c= p->connectionKey.daddr; |
| 161 | mix(a, b, c); |
| 162 | |
| 163 | a+= p->ihl + (p->tot_len << 8) + (p->doff << 24); |
| 164 | b+= p->seq; |
| 165 | c+= p->ack_seq; |
| 166 | mix(a, b, c); |
| 167 | |
| 168 | a+= p->ack + (p->rst << 8) + (p->syn << 16) + (p->fin << 24); |
| 169 | final(a, b, c); |
| 170 | |
| 171 | g_debug("segment key hash %p: %u", p, c); |
| 172 | |
| 173 | return c; |
| 174 | } |
| 175 | |
| 176 | |
| 177 | /* |
| 178 | * A GEqualFunc for g_hash_table_new() |
| 179 | * |
| 180 | * This function is for indexing TCPEvents in unMatched lists. All fields of |
| 181 | * the corresponding SegmentKey must match for two keys to be equal. |
| 182 | * |
| 183 | * Args: |
| 184 | * a, b SegmentKey* |
| 185 | * |
| 186 | * Returns: |
| 187 | * TRUE if both values are equal |
| 188 | */ |
| 189 | gboolean gefSegmentKeyEqual(gconstpointer a, gconstpointer b) |
| 190 | { |
| 191 | const SegmentKey* sA, * sB; |
| 192 | |
| 193 | sA= (SegmentKey*) a; |
| 194 | sB= (SegmentKey*) b; |
| 195 | |
| 196 | if (connectionKeyEqual(&sA->connectionKey, &sB->connectionKey) && |
| 197 | sA->ihl == sB->ihl && |
| 198 | sA->tot_len == sB->tot_len && |
| 199 | sA->seq == sB->seq && |
| 200 | sA->ack_seq == sB->ack_seq && |
| 201 | sA->doff == sB->doff && |
| 202 | sA->ack == sB->ack && |
| 203 | sA->rst == sB->rst && |
| 204 | sA->syn == sB->syn && |
| 205 | sA->fin == sB->fin) |
| 206 | { |
| 207 | g_debug("segment key equal %p %p: TRUE", sA, sB); |
| 208 | return TRUE; |
| 209 | } |
| 210 | else |
| 211 | { |
| 212 | g_debug("segment key equal %p %p: FALSE", sA, sB); |
| 213 | return FALSE; |
| 214 | } |
| 215 | } |
| 216 | |
| 217 | |
| 218 | /* |
| 219 | * A GDestroyNotify function for g_hash_table_new_full() |
| 220 | * |
| 221 | * Args: |
| 222 | * data: Event* |
| 223 | */ |
| 224 | void gdnDestroyEvent(gpointer data) |
| 225 | { |
| 226 | Event* event= data; |
| 227 | |
| 228 | event->destroy(event); |
| 229 | } |
| 230 | |
| 231 | |
| 232 | /* |
| 233 | * A GDestroyNotify function for g_hash_table_new_full() |
| 234 | * |
| 235 | * Args: |
| 236 | * data: GQueue* list[Packet] |
| 237 | */ |
| 238 | void gdnTCPSegmentListDestroy(gpointer data) |
| 239 | { |
| 240 | GQueue* list; |
| 241 | |
| 242 | list= (GQueue*) data; |
| 243 | |
| 244 | g_debug("XXXX gdnTCPSegmentListDestroy\n"); |
| 245 | |
| 246 | g_queue_foreach(list, &gfTCPSegmentDestroy, NULL); |
| 247 | g_queue_free(list); |
| 248 | } |
| 249 | |
| 250 | |
| 251 | /* |
| 252 | * A GFunc for g_queue_foreach() |
| 253 | * |
| 254 | * Args: |
| 255 | * data Message*, TCP message to destroy |
| 256 | * user_data NULL |
| 257 | */ |
| 258 | void gfTCPSegmentDestroy(gpointer data, gpointer user_data) |
| 259 | { |
| 260 | g_debug("XXXX gfTCPSegmentDestroy\n"); |
| 261 | destroyTCPSegment((Message*) data); |
| 262 | } |
| 263 | |
| 264 | |
| 265 | /* |
| 266 | * Free the memory used by a TCP Message and the memory of all its associated |
| 267 | * resources |
| 268 | * |
| 269 | * Args: |
| 270 | * segment TCP Message to destroy |
| 271 | */ |
| 272 | void destroyTCPSegment(Message* const segment) |
| 273 | { |
| 274 | TCPEvent* inE, *outE; |
| 275 | |
| 276 | g_debug("XXXX destroyTCPSegment"); |
| 277 | segment->print(segment); |
| 278 | |
| 279 | g_assert(segment->inE != NULL && segment->outE != NULL); |
| 280 | g_assert(segment->inE->type == TCP && segment->outE->type == TCP); |
| 281 | inE= segment->inE->event.tcpEvent; |
| 282 | outE= segment->outE->event.tcpEvent; |
| 283 | g_assert(inE->segmentKey == outE->segmentKey); |
| 284 | |
| 285 | outE->segmentKey= NULL; |
| 286 | |
| 287 | destroyTCPEvent(segment->inE); |
| 288 | destroyTCPEvent(segment->outE); |
| 289 | |
| 290 | free(segment); |
| 291 | } |
| 292 | |
| 293 | |
| 294 | /* |
| 295 | * Free the memory used by a TCP Exchange and the memory of SOME of its |
| 296 | * associated resources. The message is not destroyed. Use destroyTCPSegment() |
| 297 | * to free it. |
| 298 | * |
| 299 | * Args: |
| 300 | * exchange TCP Exchange to destroy. The .message must be NULL |
| 301 | */ |
| 302 | void destroyTCPExchange(Exchange* const exchange) |
| 303 | { |
| 304 | g_assert(exchange->message == NULL); |
| 305 | |
| 306 | if (exchange->acks != NULL) |
| 307 | { |
| 308 | g_queue_foreach(exchange->acks, &gfTCPSegmentDestroy, NULL); |
| 309 | g_queue_free(exchange->acks); |
| 310 | } |
| 311 | |
| 312 | free(exchange); |
| 313 | } |
| 314 | |
| 315 | |
| 316 | /* |
| 317 | * Free the memory used by a TCP Event and its associated resources |
| 318 | */ |
| 319 | void destroyTCPEvent(Event* const event) |
| 320 | { |
| 321 | g_assert(event->type == TCP); |
| 322 | |
| 323 | if (event->event.tcpEvent->segmentKey != NULL) |
| 324 | { |
| 325 | free(event->event.tcpEvent->segmentKey); |
| 326 | } |
| 327 | free(event->event.tcpEvent); |
| 328 | event->event.tcpEvent= NULL; |
| 329 | destroyEvent(event); |
| 330 | } |
| 331 | |
| 332 | /* |
| 333 | * Free the memory used by a base Event |
| 334 | */ |
| 335 | void destroyEvent(Event* const event) |
| 336 | { |
| 337 | g_assert(event->event.tcpEvent == NULL); |
| 338 | |
| 339 | free(event); |
| 340 | } |
| 341 | |
| 342 | |
| 343 | /* |
| 344 | * Free the memory used by a UDP Event and its associated resources |
| 345 | */ |
| 346 | void destroyUDPEvent(Event* const event) |
| 347 | { |
| 348 | g_assert(event->type == UDP); |
| 349 | |
| 350 | if (event->event.udpEvent->datagramKey != NULL) |
| 351 | { |
| 352 | free(event->event.udpEvent->datagramKey); |
| 353 | } |
| 354 | free(event->event.udpEvent); |
| 355 | event->event.udpEvent= NULL; |
| 356 | destroyEvent(event); |
| 357 | } |
| 358 | |
| 359 | |
| 360 | /* |
| 361 | * A GCompareFunc for g_queue_find_custom() |
| 362 | * |
| 363 | * Args: |
| 364 | * a Message* acked packet |
| 365 | * b Message* ack packet |
| 366 | * |
| 367 | * Returns: |
| 368 | * 0 if b acks a |
| 369 | */ |
| 370 | gint gcfTCPSegmentAckCompare(gconstpointer a, gconstpointer b) |
| 371 | { |
| 372 | if (isAcking((const Message*) b, (const Message*) a)) |
| 373 | { |
| 374 | return 0; |
| 375 | } |
| 376 | else |
| 377 | { |
| 378 | return 1; |
| 379 | } |
| 380 | } |
| 381 | |
| 382 | |
| 383 | /* |
| 384 | * A GHashFunc for g_hash_table_new() |
| 385 | * |
| 386 | * Hash TCP connection keys. Here are a few possible implementations: |
| 387 | * |
| 388 | * 2.4 kernels used tcp_hashfn() |
| 389 | * |
| 390 | * I've seen something about an XOR hash: |
| 391 | * http://tservice.net.ru/~s0mbre/blog/2006/05/14#2006_05_14: |
| 392 | * unsigned int h = (laddr ^ lport) ^ (faddr ^ fport); |
| 393 | * h ^= h >> 16; |
| 394 | * h ^= h >> 8; |
| 395 | * return h; |
| 396 | * |
| 397 | * In 2.6 kernels, inet_ehashfn() handles connection hashing with the help of |
| 398 | * Jenkins hashing, jhash.h |
| 399 | * |
| 400 | * This function uses jenkins hashing. The hash is not the same for packets in |
| 401 | * opposite directions of the same connection. (Hence the name |
| 402 | * connection*key*hash) |
| 403 | * |
| 404 | * Args: |
| 405 | * key ConnectionKey* |
| 406 | */ |
| 407 | guint ghfConnectionKeyHash(gconstpointer key) |
| 408 | { |
| 409 | ConnectionKey* connectionKey; |
| 410 | uint32_t a, b, c; |
| 411 | |
| 412 | connectionKey= (ConnectionKey*) key; |
| 413 | |
| 414 | a= connectionKey->source + (connectionKey->dest << 16); |
| 415 | b= connectionKey->saddr; |
| 416 | c= connectionKey->daddr; |
| 417 | final(a, b, c); |
| 418 | |
| 419 | return c; |
| 420 | } |
| 421 | |
| 422 | |
| 423 | /* |
| 424 | * A GEqualFunc for g_hash_table_new() |
| 425 | * |
| 426 | * Args: |
| 427 | * a, b ConnectionKey* |
| 428 | * |
| 429 | * Returns: |
| 430 | * TRUE if both values are equal |
| 431 | */ |
| 432 | gboolean gefConnectionKeyEqual(gconstpointer a, gconstpointer b) |
| 433 | { |
| 434 | // Two packets in the same direction |
| 435 | if (connectionKeyEqual((const ConnectionKey*) a, (const ConnectionKey*) b)) |
| 436 | { |
| 437 | return TRUE; |
| 438 | } |
| 439 | else |
| 440 | { |
| 441 | return FALSE; |
| 442 | } |
| 443 | } |
| 444 | |
| 445 | |
| 446 | /* |
| 447 | * A GDestroyNotify function for g_hash_table_new_full() |
| 448 | * |
| 449 | * Args: |
| 450 | * data: ConnectionKey* |
| 451 | */ |
| 452 | void gdnConnectionKeyDestroy(gpointer data) |
| 453 | { |
| 454 | free((ConnectionKey*) data); |
| 455 | } |
| 456 | |
| 457 | |
| 458 | /* |
| 459 | * A GHashFunc for g_hash_table_new() |
| 460 | * |
| 461 | * Args: |
| 462 | * key DatagramKey* |
| 463 | */ |
| 464 | guint ghfDatagramKeyHash(gconstpointer key) |
| 465 | { |
| 466 | DatagramKey* datagramKey; |
| 467 | uint32_t a, b, c; |
| 468 | |
| 469 | datagramKey= (DatagramKey*) key; |
| 470 | |
| 471 | a= datagramKey->saddr; |
| 472 | b= datagramKey->daddr; |
| 473 | c= datagramKey->source + (datagramKey->dest << 16); |
| 474 | mix(a, b, c); |
| 475 | |
| 476 | a+= datagramKey->ulen; // 16 bits left here |
| 477 | b+= *((uint32_t*) datagramKey->dataKey); |
| 478 | c+= *((uint32_t*) ((void*) datagramKey->dataKey + 4)); |
| 479 | final(a, b, c); |
| 480 | |
| 481 | return c; |
| 482 | } |
| 483 | |
| 484 | |
| 485 | /* |
| 486 | * A GEqualFunc for g_hash_table_new() |
| 487 | * |
| 488 | * Args: |
| 489 | * a, b DatagramKey* |
| 490 | * |
| 491 | * Returns: |
| 492 | * TRUE if both values are equal |
| 493 | */ |
| 494 | gboolean gefDatagramKeyEqual(gconstpointer a, gconstpointer b) |
| 495 | { |
| 496 | const DatagramKey* dA, * dB; |
| 497 | |
| 498 | dA= (DatagramKey*) a; |
| 499 | dB= (DatagramKey*) b; |
| 500 | |
| 501 | if (dA->saddr == dB->saddr && dA->daddr == dB->daddr && |
| 502 | dA->source == dB->source && dA->dest == dB->dest && |
| 503 | dA->ulen == dB->ulen && |
| 504 | memcmp(dA->dataKey, dB->dataKey, sizeof(dA->dataKey)) == 0) |
| 505 | { |
| 506 | return TRUE; |
| 507 | } |
| 508 | else |
| 509 | { |
| 510 | return FALSE; |
| 511 | } |
| 512 | } |
| 513 | |
| 514 | |
| 515 | /* |
| 516 | * A GDestroyNotify function for g_hash_table_new_full() |
| 517 | * |
| 518 | * Args: |
| 519 | * data: DatagramKey* |
| 520 | */ |
| 521 | void gdnDestroyDatagramKey(gpointer data) |
| 522 | { |
| 523 | free((DatagramKey*) data); |
| 524 | } |
| 525 | |
| 526 | |
| 527 | /* |
| 528 | * A GDestroyNotify function for g_hash_table_new_full() |
| 529 | * |
| 530 | * Args: |
| 531 | * data: Broadcast* |
| 532 | */ |
| 533 | void gdnDestroyBroadcast(gpointer data) |
| 534 | { |
| 535 | destroyBroadcast((Broadcast*) data); |
| 536 | } |
| 537 | |
| 538 | |
| 539 | /* |
| 540 | * Free a Broadcast struct and its associated ressources |
| 541 | * |
| 542 | * Args: |
| 543 | * broadcast: Broadcast* |
| 544 | */ |
| 545 | void destroyBroadcast(Broadcast* const broadcast) |
| 546 | { |
| 547 | g_queue_foreach(broadcast->events, &gfDestroyEvent, NULL); |
| 548 | g_queue_clear(broadcast->events); |
| 549 | free(broadcast); |
| 550 | } |
| 551 | |
| 552 | |
| 553 | /* |
| 554 | * A GFunc for g_queue_foreach() |
| 555 | * |
| 556 | * Args: |
| 557 | * data Event* |
| 558 | * user_data NULL |
| 559 | */ |
| 560 | void gfDestroyEvent(gpointer data, gpointer user_data) |
| 561 | { |
| 562 | Event* event= data; |
| 563 | |
| 564 | event->destroy(event); |
| 565 | } |
| 566 | |
| 567 | |
| 568 | /* Subtract two WallTime structs |
| 569 | * |
| 570 | * Args: |
| 571 | * tA, tB: WallTime |
| 572 | * |
| 573 | * Returns: |
| 574 | * The result of tA - tB, as a double. This may incur a loss of |
| 575 | * precision. |
| 576 | */ |
| 577 | double wallTimeSub(const WallTime const* tA, const WallTime const* tB) |
| 578 | { |
| 579 | return tA->seconds - tB->seconds + (tA->nanosec - tB->nanosec) / 1e9; |
| 580 | } |