osdl.org!shemminger | aba5acd | 2004-04-15 20:56:59 +0000 | [diff] [blame] | 1 | /* |
| 2 | * nstat.c handy utility to read counters /proc/net/netstat and snmp |
| 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 | #include <stdio.h> |
| 13 | #include <stdlib.h> |
| 14 | #include <unistd.h> |
| 15 | #include <fcntl.h> |
| 16 | #include <string.h> |
| 17 | #include <errno.h> |
| 18 | #include <time.h> |
| 19 | #include <sys/time.h> |
| 20 | #include <fnmatch.h> |
| 21 | #include <sys/file.h> |
| 22 | #include <sys/socket.h> |
| 23 | #include <sys/un.h> |
| 24 | #include <sys/poll.h> |
| 25 | #include <sys/wait.h> |
| 26 | #include <sys/stat.h> |
| 27 | #include <signal.h> |
| 28 | #include <math.h> |
| 29 | |
| 30 | #include <SNAPSHOT.h> |
| 31 | |
| 32 | int dump_zeros = 0; |
| 33 | int reset_history = 0; |
| 34 | int ignore_history = 0; |
| 35 | int no_output = 0; |
| 36 | int no_update = 0; |
| 37 | int scan_interval = 0; |
| 38 | int time_constant = 0; |
| 39 | double W; |
| 40 | char **patterns; |
| 41 | int npatterns; |
| 42 | |
| 43 | char info_source[128]; |
| 44 | int source_mismatch; |
| 45 | |
Yu Zhiguo | 4ffc44c | 2008-06-20 09:50:16 +0800 | [diff] [blame] | 46 | static int generic_proc_open(const char *env, char *name) |
osdl.org!shemminger | aba5acd | 2004-04-15 20:56:59 +0000 | [diff] [blame] | 47 | { |
| 48 | char store[128]; |
| 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_netstat_open(void) |
| 59 | { |
| 60 | return generic_proc_open("PROC_NET_NETSTAT", "net/netstat"); |
| 61 | } |
| 62 | |
| 63 | int net_snmp_open(void) |
| 64 | { |
| 65 | return generic_proc_open("PROC_NET_SNMP", "net/snmp"); |
| 66 | } |
| 67 | |
| 68 | int net_snmp6_open(void) |
| 69 | { |
| 70 | return generic_proc_open("PROC_NET_SNMP6", "net/snmp6"); |
| 71 | } |
| 72 | |
| 73 | struct nstat_ent |
| 74 | { |
| 75 | struct nstat_ent *next; |
| 76 | char *id; |
| 77 | unsigned long long val; |
| 78 | unsigned long ival; |
| 79 | double rate; |
| 80 | }; |
| 81 | |
| 82 | struct nstat_ent *kern_db; |
| 83 | struct nstat_ent *hist_db; |
| 84 | |
| 85 | char *useless_numbers[] = { |
| 86 | "IpForwarding", "IpDefaultTTL", |
| 87 | "TcpRtoAlgorithm", "TcpRtoMin", "TcpRtoMax", |
| 88 | "TcpMaxConn", "TcpCurrEstab" |
| 89 | }; |
| 90 | |
| 91 | int useless_number(char *id) |
| 92 | { |
| 93 | int i; |
| 94 | for (i=0; i<sizeof(useless_numbers)/sizeof(*useless_numbers); i++) |
| 95 | if (strcmp(id, useless_numbers[i]) == 0) |
| 96 | return 1; |
| 97 | return 0; |
| 98 | } |
| 99 | |
| 100 | int match(char *id) |
| 101 | { |
| 102 | int i; |
| 103 | |
| 104 | if (npatterns == 0) |
| 105 | return 1; |
| 106 | |
| 107 | for (i=0; i<npatterns; i++) { |
| 108 | if (!fnmatch(patterns[i], id, 0)) |
| 109 | return 1; |
| 110 | } |
| 111 | return 0; |
| 112 | } |
| 113 | |
| 114 | void load_good_table(FILE *fp) |
| 115 | { |
| 116 | char buf[4096]; |
| 117 | struct nstat_ent *db = NULL; |
| 118 | struct nstat_ent *n; |
| 119 | |
| 120 | while (fgets(buf, sizeof(buf), fp) != NULL) { |
| 121 | int nr; |
| 122 | unsigned long long val; |
| 123 | double rate; |
net[shemminger]!shemminger | b482ffa | 2004-10-19 20:02:59 +0000 | [diff] [blame] | 124 | char idbuf[sizeof(buf)]; |
osdl.org!shemminger | aba5acd | 2004-04-15 20:56:59 +0000 | [diff] [blame] | 125 | if (buf[0] == '#') { |
| 126 | buf[strlen(buf)-1] = 0; |
| 127 | if (info_source[0] && strcmp(info_source, buf+1)) |
| 128 | source_mismatch = 1; |
net[shemminger]!shemminger | b482ffa | 2004-10-19 20:02:59 +0000 | [diff] [blame] | 129 | info_source[0] = 0; |
| 130 | strncat(info_source, buf+1, sizeof(info_source)-1); |
osdl.org!shemminger | aba5acd | 2004-04-15 20:56:59 +0000 | [diff] [blame] | 131 | continue; |
| 132 | } |
net[shemminger]!shemminger | b482ffa | 2004-10-19 20:02:59 +0000 | [diff] [blame] | 133 | /* idbuf is as big as buf, so this is safe */ |
osdl.org!shemminger | aba5acd | 2004-04-15 20:56:59 +0000 | [diff] [blame] | 134 | nr = sscanf(buf, "%s%llu%lg", idbuf, &val, &rate); |
| 135 | if (nr < 2) |
| 136 | abort(); |
| 137 | if (nr < 3) |
| 138 | rate = 0; |
| 139 | if (useless_number(idbuf)) |
| 140 | continue; |
| 141 | if ((n = malloc(sizeof(*n))) == NULL) |
| 142 | abort(); |
| 143 | n->id = strdup(idbuf); |
| 144 | n->ival = (unsigned long)val; |
| 145 | n->val = val; |
| 146 | n->rate = rate; |
| 147 | n->next = db; |
| 148 | db = n; |
| 149 | } |
| 150 | |
| 151 | while (db) { |
| 152 | n = db; |
| 153 | db = db->next; |
| 154 | n->next = kern_db; |
| 155 | kern_db = n; |
| 156 | } |
| 157 | } |
| 158 | |
| 159 | |
| 160 | void load_ugly_table(FILE *fp) |
| 161 | { |
| 162 | char buf[4096]; |
| 163 | struct nstat_ent *db = NULL; |
| 164 | struct nstat_ent *n; |
| 165 | |
| 166 | while (fgets(buf, sizeof(buf), fp) != NULL) { |
net[shemminger]!shemminger | b482ffa | 2004-10-19 20:02:59 +0000 | [diff] [blame] | 167 | char idbuf[sizeof(buf)]; |
osdl.org!shemminger | aba5acd | 2004-04-15 20:56:59 +0000 | [diff] [blame] | 168 | int off; |
| 169 | char *p; |
| 170 | |
| 171 | p = strchr(buf, ':'); |
| 172 | if (!p) |
| 173 | abort(); |
| 174 | *p = 0; |
net[shemminger]!shemminger | b482ffa | 2004-10-19 20:02:59 +0000 | [diff] [blame] | 175 | idbuf[0] = 0; |
| 176 | strncat(idbuf, buf, sizeof(idbuf) - 1); |
| 177 | off = p - buf; |
osdl.org!shemminger | aba5acd | 2004-04-15 20:56:59 +0000 | [diff] [blame] | 178 | p += 2; |
| 179 | |
| 180 | while (*p) { |
| 181 | char *next; |
| 182 | if ((next = strchr(p, ' ')) != NULL) |
| 183 | *next++ = 0; |
| 184 | else if ((next = strchr(p, '\n')) != NULL) |
| 185 | *next++ = 0; |
net[shemminger]!shemminger | b482ffa | 2004-10-19 20:02:59 +0000 | [diff] [blame] | 186 | if (off < sizeof(idbuf)) { |
| 187 | idbuf[off] = 0; |
| 188 | strncat(idbuf, p, sizeof(idbuf) - off - 1); |
| 189 | } |
osdl.org!shemminger | aba5acd | 2004-04-15 20:56:59 +0000 | [diff] [blame] | 190 | n = malloc(sizeof(*n)); |
| 191 | if (!n) |
| 192 | abort(); |
| 193 | n->id = strdup(idbuf); |
| 194 | n->rate = 0; |
| 195 | n->next = db; |
| 196 | db = n; |
| 197 | p = next; |
| 198 | } |
| 199 | n = db; |
| 200 | if (fgets(buf, sizeof(buf), fp) == NULL) |
| 201 | abort(); |
| 202 | do { |
| 203 | p = strrchr(buf, ' '); |
| 204 | if (!p) |
| 205 | abort(); |
| 206 | *p = 0; |
| 207 | if (sscanf(p+1, "%lu", &n->ival) != 1) |
| 208 | abort(); |
| 209 | n->val = n->ival; |
| 210 | /* Trick to skip "dummy" trailing ICMP MIB in 2.4 */ |
| 211 | if (strcmp(idbuf, "IcmpOutAddrMaskReps") == 0) |
| 212 | idbuf[5] = 0; |
| 213 | else |
| 214 | n = n->next; |
| 215 | } while (p > buf + off + 2); |
| 216 | } |
| 217 | |
| 218 | while (db) { |
| 219 | n = db; |
| 220 | db = db->next; |
| 221 | if (useless_number(n->id)) { |
| 222 | free(n->id); |
| 223 | free(n); |
| 224 | } else { |
| 225 | n->next = kern_db; |
| 226 | kern_db = n; |
| 227 | } |
| 228 | } |
| 229 | } |
| 230 | |
| 231 | void load_snmp(void) |
| 232 | { |
| 233 | FILE *fp = fdopen(net_snmp_open(), "r"); |
| 234 | if (fp) { |
| 235 | load_ugly_table(fp); |
| 236 | fclose(fp); |
| 237 | } |
| 238 | } |
| 239 | |
| 240 | void load_snmp6(void) |
| 241 | { |
| 242 | FILE *fp = fdopen(net_snmp6_open(), "r"); |
| 243 | if (fp) { |
| 244 | load_good_table(fp); |
| 245 | fclose(fp); |
| 246 | } |
| 247 | } |
| 248 | |
| 249 | void load_netstat(void) |
| 250 | { |
| 251 | FILE *fp = fdopen(net_netstat_open(), "r"); |
| 252 | if (fp) { |
| 253 | load_ugly_table(fp); |
| 254 | fclose(fp); |
| 255 | } |
| 256 | } |
| 257 | |
| 258 | void dump_kern_db(FILE *fp, int to_hist) |
| 259 | { |
| 260 | struct nstat_ent *n, *h; |
| 261 | h = hist_db; |
| 262 | fprintf(fp, "#%s\n", info_source); |
| 263 | for (n=kern_db; n; n=n->next) { |
| 264 | unsigned long long val = n->val; |
| 265 | if (!dump_zeros && !val && !n->rate) |
| 266 | continue; |
| 267 | if (!match(n->id)) { |
| 268 | struct nstat_ent *h1; |
| 269 | if (!to_hist) |
| 270 | continue; |
| 271 | for (h1 = h; h1; h1 = h1->next) { |
| 272 | if (strcmp(h1->id, n->id) == 0) { |
| 273 | val = h1->val; |
| 274 | h = h1->next; |
| 275 | break; |
| 276 | } |
| 277 | } |
| 278 | } |
| 279 | fprintf(fp, "%-32s%-16llu%6.1f\n", n->id, val, n->rate); |
| 280 | } |
| 281 | } |
| 282 | |
| 283 | void dump_incr_db(FILE *fp) |
| 284 | { |
| 285 | struct nstat_ent *n, *h; |
| 286 | h = hist_db; |
| 287 | fprintf(fp, "#%s\n", info_source); |
| 288 | for (n=kern_db; n; n=n->next) { |
| 289 | int ovfl = 0; |
| 290 | unsigned long long val = n->val; |
| 291 | struct nstat_ent *h1; |
| 292 | for (h1 = h; h1; h1 = h1->next) { |
| 293 | if (strcmp(h1->id, n->id) == 0) { |
| 294 | if (val < h1->val) { |
| 295 | ovfl = 1; |
| 296 | val = h1->val; |
| 297 | } |
| 298 | val -= h1->val; |
| 299 | h = h1->next; |
| 300 | break; |
| 301 | } |
| 302 | } |
| 303 | if (!dump_zeros && !val && !n->rate) |
| 304 | continue; |
| 305 | if (!match(n->id)) |
| 306 | continue; |
| 307 | fprintf(fp, "%-32s%-16llu%6.1f%s\n", n->id, val, |
| 308 | n->rate, ovfl?" (overflow)":""); |
| 309 | } |
| 310 | } |
| 311 | |
| 312 | static int children; |
| 313 | |
| 314 | void sigchild(int signo) |
| 315 | { |
| 316 | } |
| 317 | |
| 318 | void update_db(int interval) |
| 319 | { |
| 320 | struct nstat_ent *n, *h; |
| 321 | |
| 322 | n = kern_db; |
| 323 | kern_db = NULL; |
| 324 | |
| 325 | load_netstat(); |
| 326 | load_snmp6(); |
| 327 | load_snmp(); |
| 328 | |
| 329 | h = kern_db; |
| 330 | kern_db = n; |
| 331 | |
| 332 | for (n = kern_db; n; n = n->next) { |
| 333 | struct nstat_ent *h1; |
| 334 | for (h1 = h; h1; h1 = h1->next) { |
| 335 | if (strcmp(h1->id, n->id) == 0) { |
| 336 | double sample; |
| 337 | unsigned long incr = h1->ival - n->ival; |
| 338 | n->val += incr; |
| 339 | n->ival = h1->ival; |
| 340 | sample = (double)(incr*1000)/interval; |
| 341 | if (interval >= scan_interval) { |
| 342 | n->rate += W*(sample-n->rate); |
| 343 | } else if (interval >= 1000) { |
| 344 | if (interval >= time_constant) { |
| 345 | n->rate = sample; |
| 346 | } else { |
| 347 | double w = W*(double)interval/scan_interval; |
| 348 | n->rate += w*(sample-n->rate); |
| 349 | } |
| 350 | } |
| 351 | |
| 352 | while (h != h1) { |
| 353 | struct nstat_ent *tmp = h; |
| 354 | h = h->next; |
| 355 | free(tmp->id); |
| 356 | free(tmp); |
| 357 | }; |
| 358 | h = h1->next; |
| 359 | free(h1->id); |
| 360 | free(h1); |
| 361 | break; |
| 362 | } |
| 363 | } |
| 364 | } |
| 365 | } |
| 366 | |
| 367 | #define T_DIFF(a,b) (((a).tv_sec-(b).tv_sec)*1000 + ((a).tv_usec-(b).tv_usec)/1000) |
| 368 | |
| 369 | |
| 370 | void server_loop(int fd) |
| 371 | { |
shemminger | 737f15f | 2005-07-08 22:08:47 +0000 | [diff] [blame] | 372 | struct timeval snaptime = { 0 }; |
osdl.org!shemminger | aba5acd | 2004-04-15 20:56:59 +0000 | [diff] [blame] | 373 | struct pollfd p; |
| 374 | p.fd = fd; |
| 375 | p.events = p.revents = POLLIN; |
Stephen Hemminger | ae665a5 | 2006-12-05 10:10:22 -0800 | [diff] [blame] | 376 | |
osdl.org!shemminger | aba5acd | 2004-04-15 20:56:59 +0000 | [diff] [blame] | 377 | sprintf(info_source, "%d.%lu sampling_interval=%d time_const=%d", |
| 378 | getpid(), (unsigned long)random(), scan_interval/1000, time_constant/1000); |
| 379 | |
| 380 | load_netstat(); |
| 381 | load_snmp6(); |
| 382 | load_snmp(); |
| 383 | |
| 384 | for (;;) { |
| 385 | int status; |
| 386 | int tdiff; |
| 387 | struct timeval now; |
| 388 | gettimeofday(&now, NULL); |
| 389 | tdiff = T_DIFF(now, snaptime); |
| 390 | if (tdiff >= scan_interval) { |
| 391 | update_db(tdiff); |
| 392 | snaptime = now; |
| 393 | tdiff = 0; |
| 394 | } |
| 395 | if (poll(&p, 1, tdiff + scan_interval) > 0 |
| 396 | && (p.revents&POLLIN)) { |
| 397 | int clnt = accept(fd, NULL, NULL); |
| 398 | if (clnt >= 0) { |
| 399 | pid_t pid; |
| 400 | if (children >= 5) { |
| 401 | close(clnt); |
| 402 | } else if ((pid = fork()) != 0) { |
| 403 | if (pid>0) |
| 404 | children++; |
| 405 | close(clnt); |
| 406 | } else { |
| 407 | FILE *fp = fdopen(clnt, "w"); |
| 408 | if (fp) { |
| 409 | if (tdiff > 0) |
| 410 | update_db(tdiff); |
| 411 | dump_kern_db(fp, 0); |
| 412 | } |
| 413 | exit(0); |
| 414 | } |
| 415 | } |
| 416 | } |
| 417 | while (children && waitpid(-1, &status, WNOHANG) > 0) |
| 418 | children--; |
| 419 | } |
| 420 | } |
| 421 | |
| 422 | int verify_forging(int fd) |
| 423 | { |
| 424 | struct ucred cred; |
shemminger | 737f15f | 2005-07-08 22:08:47 +0000 | [diff] [blame] | 425 | socklen_t olen = sizeof(cred); |
| 426 | |
osdl.org!shemminger | aba5acd | 2004-04-15 20:56:59 +0000 | [diff] [blame] | 427 | if (getsockopt(fd, SOL_SOCKET, SO_PEERCRED, (void*)&cred, &olen) || |
| 428 | olen < sizeof(cred)) |
| 429 | return -1; |
| 430 | if (cred.uid == getuid() || cred.uid == 0) |
| 431 | return 0; |
| 432 | return -1; |
| 433 | } |
| 434 | |
| 435 | static void usage(void) __attribute__((noreturn)); |
| 436 | |
| 437 | static void usage(void) |
| 438 | { |
| 439 | fprintf(stderr, |
| 440 | "Usage: nstat [ -h?vVzrnasd:t: ] [ PATTERN [ PATTERN ] ]\n" |
| 441 | ); |
| 442 | exit(-1); |
| 443 | } |
| 444 | |
| 445 | |
| 446 | int main(int argc, char *argv[]) |
| 447 | { |
| 448 | char hist_name[128]; |
| 449 | struct sockaddr_un sun; |
| 450 | FILE *hist_fp = NULL; |
| 451 | int ch; |
| 452 | int fd; |
| 453 | |
| 454 | while ((ch = getopt(argc, argv, "h?vVzrnasd:t:")) != EOF) { |
| 455 | switch(ch) { |
| 456 | case 'z': |
| 457 | dump_zeros = 1; |
| 458 | break; |
| 459 | case 'r': |
| 460 | reset_history = 1; |
| 461 | break; |
| 462 | case 'a': |
| 463 | ignore_history = 1; |
| 464 | break; |
| 465 | case 's': |
| 466 | no_update = 1; |
| 467 | break; |
| 468 | case 'n': |
| 469 | no_output = 1; |
| 470 | break; |
| 471 | case 'd': |
| 472 | scan_interval = 1000*atoi(optarg); |
| 473 | break; |
| 474 | case 't': |
| 475 | if (sscanf(optarg, "%d", &time_constant) != 1 || |
| 476 | time_constant <= 0) { |
| 477 | fprintf(stderr, "nstat: invalid time constant divisor\n"); |
| 478 | exit(-1); |
| 479 | } |
| 480 | break; |
| 481 | case 'v': |
| 482 | case 'V': |
| 483 | printf("nstat utility, iproute2-ss%s\n", SNAPSHOT); |
| 484 | exit(0); |
| 485 | case 'h': |
| 486 | case '?': |
| 487 | default: |
| 488 | usage(); |
| 489 | } |
| 490 | } |
| 491 | |
| 492 | argc -= optind; |
| 493 | argv += optind; |
| 494 | |
| 495 | sun.sun_family = AF_UNIX; |
| 496 | sun.sun_path[0] = 0; |
| 497 | sprintf(sun.sun_path+1, "nstat%d", getuid()); |
| 498 | |
| 499 | if (scan_interval > 0) { |
| 500 | if (time_constant == 0) |
| 501 | time_constant = 60; |
| 502 | time_constant *= 1000; |
| 503 | W = 1 - 1/exp(log(10)*(double)scan_interval/time_constant); |
| 504 | if ((fd = socket(AF_UNIX, SOCK_STREAM, 0)) < 0) { |
| 505 | perror("nstat: socket"); |
| 506 | exit(-1); |
| 507 | } |
| 508 | if (bind(fd, (struct sockaddr*)&sun, 2+1+strlen(sun.sun_path+1)) < 0) { |
| 509 | perror("nstat: bind"); |
| 510 | exit(-1); |
| 511 | } |
| 512 | if (listen(fd, 5) < 0) { |
| 513 | perror("nstat: listen"); |
| 514 | exit(-1); |
| 515 | } |
| 516 | if (fork()) |
| 517 | exit(0); |
| 518 | chdir("/"); |
| 519 | close(0); close(1); close(2); setsid(); |
| 520 | signal(SIGPIPE, SIG_IGN); |
| 521 | signal(SIGCHLD, sigchild); |
| 522 | server_loop(fd); |
| 523 | exit(0); |
| 524 | } |
| 525 | |
| 526 | patterns = argv; |
| 527 | npatterns = argc; |
| 528 | |
| 529 | if (getenv("NSTAT_HISTORY")) |
| 530 | snprintf(hist_name, sizeof(hist_name), getenv("NSTAT_HISTORY")); |
| 531 | else |
| 532 | sprintf(hist_name, "/tmp/.nstat.u%d", getuid()); |
| 533 | |
| 534 | if (reset_history) |
| 535 | unlink(hist_name); |
| 536 | |
| 537 | if (!ignore_history || !no_update) { |
| 538 | struct stat stb; |
| 539 | |
| 540 | fd = open(hist_name, O_RDWR|O_CREAT|O_NOFOLLOW, 0600); |
| 541 | if (fd < 0) { |
| 542 | perror("nstat: open history file"); |
| 543 | exit(-1); |
| 544 | } |
| 545 | if ((hist_fp = fdopen(fd, "r+")) == NULL) { |
| 546 | perror("nstat: fdopen history file"); |
| 547 | exit(-1); |
| 548 | } |
| 549 | if (flock(fileno(hist_fp), LOCK_EX)) { |
| 550 | perror("nstat: flock history file"); |
| 551 | exit(-1); |
| 552 | } |
| 553 | if (fstat(fileno(hist_fp), &stb) != 0) { |
| 554 | perror("nstat: fstat history file"); |
| 555 | exit(-1); |
| 556 | } |
| 557 | if (stb.st_nlink != 1 || stb.st_uid != getuid()) { |
| 558 | fprintf(stderr, "nstat: something is so wrong with history file, that I prefer not to proceed.\n"); |
| 559 | exit(-1); |
| 560 | } |
| 561 | if (!ignore_history) { |
| 562 | FILE *tfp; |
| 563 | long uptime; |
| 564 | if ((tfp = fopen("/proc/uptime", "r")) != NULL) { |
| 565 | if (fscanf(tfp, "%ld", &uptime) != 1) |
| 566 | uptime = -1; |
| 567 | fclose(tfp); |
| 568 | } |
| 569 | if (uptime >= 0 && time(NULL) >= stb.st_mtime+uptime) { |
| 570 | fprintf(stderr, "nstat: history is aged out, resetting\n"); |
| 571 | ftruncate(fileno(hist_fp), 0); |
| 572 | } |
| 573 | } |
| 574 | |
| 575 | load_good_table(hist_fp); |
| 576 | |
| 577 | hist_db = kern_db; |
| 578 | kern_db = NULL; |
| 579 | } |
| 580 | |
| 581 | if ((fd = socket(AF_UNIX, SOCK_STREAM, 0)) >= 0 && |
| 582 | (connect(fd, (struct sockaddr*)&sun, 2+1+strlen(sun.sun_path+1)) == 0 |
| 583 | || (strcpy(sun.sun_path+1, "nstat0"), |
| 584 | connect(fd, (struct sockaddr*)&sun, 2+1+strlen(sun.sun_path+1)) == 0)) |
| 585 | && verify_forging(fd) == 0) { |
| 586 | FILE *sfp = fdopen(fd, "r"); |
| 587 | load_good_table(sfp); |
| 588 | if (hist_db && source_mismatch) { |
| 589 | fprintf(stderr, "nstat: history is stale, ignoring it.\n"); |
| 590 | hist_db = NULL; |
| 591 | } |
| 592 | fclose(sfp); |
| 593 | } else { |
| 594 | if (fd >= 0) |
| 595 | close(fd); |
| 596 | if (hist_db && info_source[0] && strcmp(info_source, "kernel")) { |
| 597 | fprintf(stderr, "nstat: history is stale, ignoring it.\n"); |
| 598 | hist_db = NULL; |
| 599 | info_source[0] = 0; |
| 600 | } |
| 601 | load_netstat(); |
| 602 | load_snmp6(); |
| 603 | load_snmp(); |
| 604 | if (info_source[0] == 0) |
| 605 | strcpy(info_source, "kernel"); |
| 606 | } |
| 607 | |
| 608 | if (!no_output) { |
| 609 | if (ignore_history || hist_db == NULL) |
| 610 | dump_kern_db(stdout, 0); |
| 611 | else |
| 612 | dump_incr_db(stdout); |
| 613 | } |
| 614 | if (!no_update) { |
| 615 | ftruncate(fileno(hist_fp), 0); |
| 616 | rewind(hist_fp); |
| 617 | dump_kern_db(hist_fp, 1); |
| 618 | fflush(hist_fp); |
| 619 | } |
| 620 | exit(0); |
| 621 | } |