1 /* 2 * rtacct.c Applet to display contents of /proc/net/rt_acct. 3 * 4 * This program is free software; you can redistribute it and/or 5 * modify it under the terms of the GNU General Public License 6 * as published by the Free Software Foundation; either version 7 * 2 of the License, or (at your option) any later version. 8 * 9 * Authors: Alexey Kuznetsov, <kuznet (at) ms2.inr.ac.ru> 10 * 11 */ 12 13 #include <stdio.h> 14 #include <stdlib.h> 15 #include <unistd.h> 16 #include <fcntl.h> 17 #include <string.h> 18 #include <errno.h> 19 #include <time.h> 20 #include <sys/time.h> 21 #include <fnmatch.h> 22 #include <sys/file.h> 23 #include <sys/socket.h> 24 #include <sys/un.h> 25 #include <sys/poll.h> 26 #include <sys/wait.h> 27 #include <sys/stat.h> 28 #include <sys/mman.h> 29 #include <signal.h> 30 #include <math.h> 31 32 #include "rt_names.h" 33 34 #include <SNAPSHOT.h> 35 36 int reset_history = 0; 37 int ignore_history = 0; 38 int no_output = 0; 39 int no_update = 0; 40 int scan_interval = 0; 41 int time_constant = 0; 42 int dump_zeros = 0; 43 unsigned long magic_number = 0; 44 double W; 45 46 static int generic_proc_open(const char *env, const char *name) 47 { 48 char store[1024]; 49 char *p = getenv(env); 50 if (!p) { 51 p = getenv("PROC_ROOT") ? : "/proc"; 52 snprintf(store, sizeof(store)-1, "%s/%s", p, name); 53 p = store; 54 } 55 return open(p, O_RDONLY); 56 } 57 58 int net_rtacct_open(void) 59 { 60 return generic_proc_open("PROC_NET_RTACCT", "net/rt_acct"); 61 } 62 63 __u32 rmap[256/4]; 64 65 struct rtacct_data 66 { 67 __u32 ival[256*4]; 68 69 unsigned long long val[256*4]; 70 double rate[256*4]; 71 char signature[128]; 72 }; 73 74 struct rtacct_data kern_db_static; 75 76 struct rtacct_data *kern_db = &kern_db_static; 77 struct rtacct_data *hist_db; 78 79 void nread(int fd, char *buf, int tot) 80 { 81 int count = 0; 82 83 while (count < tot) { 84 int n = read(fd, buf+count, tot-count); 85 if (n < 0) { 86 if (errno == EINTR) 87 continue; 88 exit(-1); 89 } 90 if (n == 0) 91 exit(-1); 92 count += n; 93 } 94 } 95 96 97 __u32 *read_kern_table(__u32 *tbl) 98 { 99 static __u32 *tbl_ptr; 100 int fd; 101 102 if (magic_number) { 103 if (tbl_ptr != NULL) 104 return tbl_ptr; 105 106 fd = open("/dev/mem", O_RDONLY); 107 if (fd < 0) { 108 perror("magic open"); 109 exit(-1); 110 } 111 tbl_ptr = mmap(NULL, 4096, 112 PROT_READ, 113 MAP_SHARED, 114 fd, magic_number); 115 if ((unsigned long)tbl_ptr == ~0UL) { 116 perror("magic mmap"); 117 exit(-1); 118 } 119 close(fd); 120 return tbl_ptr; 121 } 122 123 fd = net_rtacct_open(); 124 if (fd >= 0) { 125 nread(fd, (char*)tbl, 256*16); 126 close(fd); 127 } else { 128 memset(tbl, 0, 256*16); 129 } 130 return tbl; 131 } 132 133 void format_rate(FILE *fp, double rate) 134 { 135 char temp[64]; 136 137 if (rate > 1024*1024) { 138 sprintf(temp, "%uM", (unsigned)rint(rate/(1024*1024))); 139 fprintf(fp, " %-10s", temp); 140 } else if (rate > 1024) { 141 sprintf(temp, "%uK", (unsigned)rint(rate/1024)); 142 fprintf(fp, " %-10s", temp); 143 } else 144 fprintf(fp, " %-10u", (unsigned)rate); 145 } 146 147 void format_count(FILE *fp, unsigned long long val) 148 { 149 if (val > 1024*1024*1024) 150 fprintf(fp, " %10lluM", val/(1024*1024)); 151 else if (val > 1024*1024) 152 fprintf(fp, " %10lluK", val/1024); 153 else 154 fprintf(fp, " %10llu", val); 155 } 156 157 void dump_abs_db(FILE *fp) 158 { 159 int realm; 160 char b1[16]; 161 162 if (!no_output) { 163 fprintf(fp, "#%s\n", kern_db->signature); 164 fprintf(fp, 165 "%-10s " 166 "%-10s " 167 "%-10s " 168 "%-10s " 169 "%-10s " 170 "\n" 171 , "Realm", "BytesTo", "PktsTo", "BytesFrom", "PktsFrom"); 172 fprintf(fp, 173 "%-10s " 174 "%-10s " 175 "%-10s " 176 "%-10s " 177 "%-10s " 178 "\n" 179 , "", "BPSTo", "PPSTo", "BPSFrom", "PPSFrom"); 180 181 } 182 183 for (realm=0; realm<256; realm++) { 184 int i; 185 unsigned long long *val; 186 double *rate; 187 188 if (!(rmap[realm>>5] & (1<<(realm&0x1f)))) 189 continue; 190 191 val = &kern_db->val[realm*4]; 192 rate = &kern_db->rate[realm*4]; 193 194 if (!dump_zeros && 195 !val[0] && !rate[0] && 196 !val[1] && !rate[1] && 197 !val[2] && !rate[2] && 198 !val[3] && !rate[3]) 199 continue; 200 201 if (hist_db) { 202 memcpy(&hist_db->val[realm*4], val, sizeof(*val)*4); 203 } 204 205 if (no_output) 206 continue; 207 208 fprintf(fp, "%-10s", rtnl_rtrealm_n2a(realm, b1, sizeof(b1))); 209 for (i = 0; i < 4; i++) 210 format_count(fp, val[i]); 211 fprintf(fp, "\n%-10s", ""); 212 for (i = 0; i < 4; i++) 213 format_rate(fp, rate[i]); 214 fprintf(fp, "\n"); 215 } 216 } 217 218 219 void dump_incr_db(FILE *fp) 220 { 221 int k, realm; 222 char b1[16]; 223 224 if (!no_output) { 225 fprintf(fp, "#%s\n", kern_db->signature); 226 fprintf(fp, 227 "%-10s " 228 "%-10s " 229 "%-10s " 230 "%-10s " 231 "%-10s " 232 "\n" 233 , "Realm", "BytesTo", "PktsTo", "BytesFrom", "PktsFrom"); 234 fprintf(fp, 235 "%-10s " 236 "%-10s " 237 "%-10s " 238 "%-10s " 239 "%-10s " 240 "\n" 241 , "", "BPSTo", "PPSTo", "BPSFrom", "PPSFrom"); 242 } 243 244 for (realm=0; realm<256; realm++) { 245 int ovfl = 0; 246 int i; 247 unsigned long long *val; 248 double *rate; 249 unsigned long long rval[4]; 250 251 if (!(rmap[realm>>5] & (1<<(realm&0x1f)))) 252 continue; 253 254 val = &kern_db->val[realm*4]; 255 rate = &kern_db->rate[realm*4]; 256 257 for (k=0; k<4; k++) { 258 rval[k] = val[k]; 259 if (rval[k] < hist_db->val[realm*4+k]) 260 ovfl = 1; 261 else 262 rval[k] -= hist_db->val[realm*4+k]; 263 } 264 if (ovfl) { 265 for (k=0; k<4; k++) 266 rval[k] = val[k]; 267 } 268 if (hist_db) { 269 memcpy(&hist_db->val[realm*4], val, sizeof(*val)*4); 270 } 271 272 if (no_output) 273 continue; 274 275 if (!dump_zeros && 276 !rval[0] && !rate[0] && 277 !rval[1] && !rate[1] && 278 !rval[2] && !rate[2] && 279 !rval[3] && !rate[3]) 280 continue; 281 282 283 fprintf(fp, "%-10s", rtnl_rtrealm_n2a(realm, b1, sizeof(b1))); 284 for (i = 0; i < 4; i++) 285 format_count(fp, rval[i]); 286 fprintf(fp, "\n%-10s", ""); 287 for (i = 0; i < 4; i++) 288 format_rate(fp, rate[i]); 289 fprintf(fp, "\n"); 290 } 291 } 292 293 294 static int children; 295 296 void sigchild(int signo) 297 { 298 } 299 300 /* Server side only: read kernel data, update tables, calculate rates. */ 301 302 void update_db(int interval) 303 { 304 int i; 305 __u32 *ival; 306 __u32 _ival[256*4]; 307 308 ival = read_kern_table(_ival); 309 310 for (i=0; i<256*4; i++) { 311 double sample; 312 __u32 incr = ival[i] - kern_db->ival[i]; 313 314 if (ival[i] == 0 && incr == 0 && 315 kern_db->val[i] == 0 && kern_db->rate[i] == 0) 316 continue; 317 318 kern_db->val[i] += incr; 319 kern_db->ival[i] = ival[i]; 320 sample = (double)(incr*1000)/interval; 321 if (interval >= scan_interval) { 322 kern_db->rate[i] += W*(sample-kern_db->rate[i]); 323 } else if (interval >= 1000) { 324 if (interval >= time_constant) { 325 kern_db->rate[i] = sample; 326 } else { 327 double w = W*(double)interval/scan_interval; 328 kern_db->rate[i] += w*(sample-kern_db->rate[i]); 329 } 330 } 331 } 332 } 333 334 void send_db(int fd) 335 { 336 int tot = 0; 337 338 while (tot < sizeof(*kern_db)) { 339 int n = write(fd, ((char*)kern_db) + tot, sizeof(*kern_db)-tot); 340 if (n < 0) { 341 if (errno == EINTR) 342 continue; 343 return; 344 } 345 tot += n; 346 } 347 } 348 349 350 351 #define T_DIFF(a,b) (((a).tv_sec-(b).tv_sec)*1000 + ((a).tv_usec-(b).tv_usec)/1000) 352 353 354 void pad_kern_table(struct rtacct_data *dat, __u32 *ival) 355 { 356 int i; 357 memset(dat->rate, 0, sizeof(dat->rate)); 358 if (dat->ival != ival) 359 memcpy(dat->ival, ival, sizeof(dat->ival)); 360 for (i=0; i<256*4; i++) 361 dat->val[i] = ival[i]; 362 } 363 364 void server_loop(int fd) 365 { 366 struct timeval snaptime = { 0 }; 367 struct pollfd p; 368 p.fd = fd; 369 p.events = p.revents = POLLIN; 370 371 sprintf(kern_db->signature, 372 "%u.%lu sampling_interval=%d time_const=%d", 373 (unsigned) getpid(), (unsigned long)random(), 374 scan_interval/1000, time_constant/1000); 375 376 pad_kern_table(kern_db, read_kern_table(kern_db->ival)); 377 378 for (;;) { 379 int status; 380 int tdiff; 381 struct timeval now; 382 gettimeofday(&now, NULL); 383 tdiff = T_DIFF(now, snaptime); 384 if (tdiff >= scan_interval) { 385 update_db(tdiff); 386 snaptime = now; 387 tdiff = 0; 388 } 389 if (poll(&p, 1, tdiff + scan_interval) > 0 390 && (p.revents&POLLIN)) { 391 int clnt = accept(fd, NULL, NULL); 392 if (clnt >= 0) { 393 pid_t pid; 394 if (children >= 5) { 395 close(clnt); 396 } else if ((pid = fork()) != 0) { 397 if (pid>0) 398 children++; 399 close(clnt); 400 } else { 401 if (tdiff > 0) 402 update_db(tdiff); 403 send_db(clnt); 404 exit(0); 405 } 406 } 407 } 408 while (children && waitpid(-1, &status, WNOHANG) > 0) 409 children--; 410 } 411 } 412 413 int verify_forging(int fd) 414 { 415 struct ucred cred; 416 socklen_t olen = sizeof(cred); 417 418 if (getsockopt(fd, SOL_SOCKET, SO_PEERCRED, (void*)&cred, &olen) || 419 olen < sizeof(cred)) 420 return -1; 421 if (cred.uid == getuid() || cred.uid == 0) 422 return 0; 423 return -1; 424 } 425 426 static void usage(void) __attribute__((noreturn)); 427 428 static void usage(void) 429 { 430 fprintf(stderr, 431 "Usage: rtacct [ -h?vVzrnasd:t: ] [ ListOfRealms ]\n" 432 ); 433 exit(-1); 434 } 435 436 int main(int argc, char *argv[]) 437 { 438 char hist_name[128]; 439 struct sockaddr_un sun; 440 int ch; 441 int fd; 442 443 while ((ch = getopt(argc, argv, "h?vVzrM:nasd:t:")) != EOF) { 444 switch(ch) { 445 case 'z': 446 dump_zeros = 1; 447 break; 448 case 'r': 449 reset_history = 1; 450 break; 451 case 'a': 452 ignore_history = 1; 453 break; 454 case 's': 455 no_update = 1; 456 break; 457 case 'n': 458 no_output = 1; 459 break; 460 case 'd': 461 scan_interval = 1000*atoi(optarg); 462 break; 463 case 't': 464 if (sscanf(optarg, "%d", &time_constant) != 1 || 465 time_constant <= 0) { 466 fprintf(stderr, "rtacct: invalid time constant divisor\n"); 467 exit(-1); 468 } 469 break; 470 case 'v': 471 case 'V': 472 printf("rtacct utility, iproute2-ss%s\n", SNAPSHOT); 473 exit(0); 474 case 'M': 475 /* Some secret undocumented option, nobody 476 * is expected to ask about its sense. See? 477 */ 478 sscanf(optarg, "%lx", &magic_number); 479 break; 480 case 'h': 481 case '?': 482 default: 483 usage(); 484 } 485 } 486 487 argc -= optind; 488 argv += optind; 489 490 if (argc) { 491 while (argc > 0) { 492 __u32 realm; 493 if (rtnl_rtrealm_a2n(&realm, argv[0])) { 494 fprintf(stderr, "Warning: realm \"%s\" does not exist.\n", argv[0]); 495 exit(-1); 496 } 497 rmap[realm>>5] |= (1<<(realm&0x1f)); 498 argc--; argv++; 499 } 500 } else { 501 memset(rmap, ~0, sizeof(rmap)); 502 /* Always suppress zeros. */ 503 dump_zeros = 0; 504 } 505 506 sun.sun_family = AF_UNIX; 507 sun.sun_path[0] = 0; 508 sprintf(sun.sun_path+1, "rtacct%d", getuid()); 509 510 if (scan_interval > 0) { 511 if (time_constant == 0) 512 time_constant = 60; 513 time_constant *= 1000; 514 W = 1 - 1/exp(log(10)*(double)scan_interval/time_constant); 515 if ((fd = socket(AF_UNIX, SOCK_STREAM, 0)) < 0) { 516 perror("rtacct: socket"); 517 exit(-1); 518 } 519 if (bind(fd, (struct sockaddr*)&sun, 2+1+strlen(sun.sun_path+1)) < 0) { 520 perror("rtacct: bind"); 521 exit(-1); 522 } 523 if (listen(fd, 5) < 0) { 524 perror("rtacct: listen"); 525 exit(-1); 526 } 527 if (daemon(0, 0)) { 528 perror("rtacct: daemon"); 529 exit(-1); 530 } 531 signal(SIGPIPE, SIG_IGN); 532 signal(SIGCHLD, sigchild); 533 server_loop(fd); 534 exit(0); 535 } 536 537 if (getenv("RTACCT_HISTORY")) 538 snprintf(hist_name, sizeof(hist_name), getenv("RTACCT_HISTORY")); 539 else 540 sprintf(hist_name, "/tmp/.rtacct.u%d", getuid()); 541 542 if (reset_history) 543 unlink(hist_name); 544 545 if (!ignore_history || !no_update) { 546 struct stat stb; 547 548 fd = open(hist_name, O_RDWR|O_CREAT|O_NOFOLLOW, 0600); 549 if (fd < 0) { 550 perror("rtacct: open history file"); 551 exit(-1); 552 } 553 if (flock(fd, LOCK_EX)) { 554 perror("rtacct: flock history file"); 555 exit(-1); 556 } 557 if (fstat(fd, &stb) != 0) { 558 perror("rtacct: fstat history file"); 559 exit(-1); 560 } 561 if (stb.st_nlink != 1 || stb.st_uid != getuid()) { 562 fprintf(stderr, "rtacct: something is so wrong with history file, that I prefer not to proceed.\n"); 563 exit(-1); 564 } 565 if (stb.st_size != sizeof(*hist_db)) 566 write(fd, kern_db, sizeof(*hist_db)); 567 568 hist_db = mmap(NULL, sizeof(*hist_db), 569 PROT_READ|PROT_WRITE, 570 no_update ? MAP_PRIVATE : MAP_SHARED, 571 fd, 0); 572 573 if ((unsigned long)hist_db == ~0UL) { 574 perror("mmap"); 575 exit(-1); 576 } 577 578 if (!ignore_history) { 579 FILE *tfp; 580 long uptime; 581 if ((tfp = fopen("/proc/uptime", "r")) != NULL) { 582 if (fscanf(tfp, "%ld", &uptime) != 1) 583 uptime = -1; 584 fclose(tfp); 585 } 586 587 if (uptime >= 0 && time(NULL) >= stb.st_mtime+uptime) { 588 fprintf(stderr, "rtacct: history is aged out, resetting\n"); 589 memset(hist_db, 0, sizeof(*hist_db)); 590 } 591 } 592 593 close(fd); 594 } 595 596 if ((fd = socket(AF_UNIX, SOCK_STREAM, 0)) >= 0 && 597 (connect(fd, (struct sockaddr*)&sun, 2+1+strlen(sun.sun_path+1)) == 0 598 || (strcpy(sun.sun_path+1, "rtacct0"), 599 connect(fd, (struct sockaddr*)&sun, 2+1+strlen(sun.sun_path+1)) == 0)) 600 && verify_forging(fd) == 0) { 601 nread(fd, (char*)kern_db, sizeof(*kern_db)); 602 if (hist_db && hist_db->signature[0] && 603 strcmp(kern_db->signature, hist_db->signature)) { 604 fprintf(stderr, "rtacct: history is stale, ignoring it.\n"); 605 hist_db = NULL; 606 } 607 close(fd); 608 } else { 609 if (fd >= 0) 610 close(fd); 611 612 if (hist_db && hist_db->signature[0] && 613 strcmp(hist_db->signature, "kernel")) { 614 fprintf(stderr, "rtacct: history is stale, ignoring it.\n"); 615 hist_db = NULL; 616 } 617 618 pad_kern_table(kern_db, read_kern_table(kern_db->ival)); 619 strcpy(kern_db->signature, "kernel"); 620 } 621 622 if (ignore_history || hist_db == NULL) 623 dump_abs_db(stdout); 624 else 625 dump_incr_db(stdout); 626 627 exit(0); 628 } 629
