osdl.org!shemminger | aba5acd | 2004-04-15 20:56:59 +0000 | [diff] [blame] | 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@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 | |
Yu Zhiguo | 4ffc44c | 2008-06-20 09:50:16 +0800 | [diff] [blame] | 46 | static int generic_proc_open(const char *env, const char *name) |
osdl.org!shemminger | aba5acd | 2004-04-15 20:56:59 +0000 | [diff] [blame] | 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 | } |
Yu Zhiguo | 4ffc44c | 2008-06-20 09:50:16 +0800 | [diff] [blame] | 55 | return open(p, O_RDONLY); |
osdl.org!shemminger | aba5acd | 2004-04-15 20:56:59 +0000 | [diff] [blame] | 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]; |
shemminger | 737f15f | 2005-07-08 22:08:47 +0000 | [diff] [blame] | 71 | char signature[128]; |
osdl.org!shemminger | aba5acd | 2004-04-15 20:56:59 +0000 | [diff] [blame] | 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" |
Stephen Hemminger | ae665a5 | 2006-12-05 10:10:22 -0800 | [diff] [blame] | 171 | , "Realm", "BytesTo", "PktsTo", "BytesFrom", "PktsFrom"); |
osdl.org!shemminger | aba5acd | 2004-04-15 20:56:59 +0000 | [diff] [blame] | 172 | fprintf(fp, |
| 173 | "%-10s " |
| 174 | "%-10s " |
| 175 | "%-10s " |
| 176 | "%-10s " |
| 177 | "%-10s " |
| 178 | "\n" |
Stephen Hemminger | ae665a5 | 2006-12-05 10:10:22 -0800 | [diff] [blame] | 179 | , "", "BPSTo", "PPSTo", "BPSFrom", "PPSFrom"); |
osdl.org!shemminger | aba5acd | 2004-04-15 20:56:59 +0000 | [diff] [blame] | 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++) |
Stephen Hemminger | ae665a5 | 2006-12-05 10:10:22 -0800 | [diff] [blame] | 210 | format_count(fp, val[i]); |
osdl.org!shemminger | aba5acd | 2004-04-15 20:56:59 +0000 | [diff] [blame] | 211 | fprintf(fp, "\n%-10s", ""); |
| 212 | for (i = 0; i < 4; i++) |
Stephen Hemminger | ae665a5 | 2006-12-05 10:10:22 -0800 | [diff] [blame] | 213 | format_rate(fp, rate[i]); |
osdl.org!shemminger | aba5acd | 2004-04-15 20:56:59 +0000 | [diff] [blame] | 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" |
Stephen Hemminger | ae665a5 | 2006-12-05 10:10:22 -0800 | [diff] [blame] | 233 | , "Realm", "BytesTo", "PktsTo", "BytesFrom", "PktsFrom"); |
osdl.org!shemminger | aba5acd | 2004-04-15 20:56:59 +0000 | [diff] [blame] | 234 | fprintf(fp, |
| 235 | "%-10s " |
| 236 | "%-10s " |
| 237 | "%-10s " |
| 238 | "%-10s " |
| 239 | "%-10s " |
| 240 | "\n" |
Stephen Hemminger | ae665a5 | 2006-12-05 10:10:22 -0800 | [diff] [blame] | 241 | , "", "BPSTo", "PPSTo", "BPSFrom", "PPSFrom"); |
osdl.org!shemminger | aba5acd | 2004-04-15 20:56:59 +0000 | [diff] [blame] | 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++) |
Stephen Hemminger | ae665a5 | 2006-12-05 10:10:22 -0800 | [diff] [blame] | 285 | format_count(fp, rval[i]); |
osdl.org!shemminger | aba5acd | 2004-04-15 20:56:59 +0000 | [diff] [blame] | 286 | fprintf(fp, "\n%-10s", ""); |
| 287 | for (i = 0; i < 4; i++) |
Stephen Hemminger | ae665a5 | 2006-12-05 10:10:22 -0800 | [diff] [blame] | 288 | format_rate(fp, rate[i]); |
osdl.org!shemminger | aba5acd | 2004-04-15 20:56:59 +0000 | [diff] [blame] | 289 | fprintf(fp, "\n"); |
| 290 | } |
| 291 | } |
| 292 | |
| 293 | |
| 294 | static int children; |
| 295 | |
| 296 | void sigchild(int signo) |
| 297 | { |
| 298 | } |
| 299 | |
Stephen Hemminger | ae665a5 | 2006-12-05 10:10:22 -0800 | [diff] [blame] | 300 | /* Server side only: read kernel data, update tables, calculate rates. */ |
osdl.org!shemminger | aba5acd | 2004-04-15 20:56:59 +0000 | [diff] [blame] | 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 | { |
shemminger | 737f15f | 2005-07-08 22:08:47 +0000 | [diff] [blame] | 366 | struct timeval snaptime = { 0 }; |
osdl.org!shemminger | aba5acd | 2004-04-15 20:56:59 +0000 | [diff] [blame] | 367 | struct pollfd p; |
| 368 | p.fd = fd; |
| 369 | p.events = p.revents = POLLIN; |
| 370 | |
Stephen Hemminger | ae665a5 | 2006-12-05 10:10:22 -0800 | [diff] [blame] | 371 | sprintf(kern_db->signature, |
shemminger | 737f15f | 2005-07-08 22:08:47 +0000 | [diff] [blame] | 372 | "%u.%lu sampling_interval=%d time_const=%d", |
Stephen Hemminger | ae665a5 | 2006-12-05 10:10:22 -0800 | [diff] [blame] | 373 | (unsigned) getpid(), (unsigned long)random(), |
shemminger | 737f15f | 2005-07-08 22:08:47 +0000 | [diff] [blame] | 374 | scan_interval/1000, time_constant/1000); |
osdl.org!shemminger | aba5acd | 2004-04-15 20:56:59 +0000 | [diff] [blame] | 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; |
shemminger | 737f15f | 2005-07-08 22:08:47 +0000 | [diff] [blame] | 416 | socklen_t olen = sizeof(cred); |
| 417 | |
osdl.org!shemminger | aba5acd | 2004-04-15 20:56:59 +0000 | [diff] [blame] | 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 (fork()) |
| 528 | exit(0); |
| 529 | chdir("/"); |
| 530 | close(0); close(1); close(2); setsid(); |
| 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 | } |