misc/ifstat.c

   1 /*
   2  * ifstat.c     handy utility to read net interface statistics
   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 #include <getopt.h>
  30
  31 #include <libnetlink.h>
  32 #include <json_writer.h>
  33 #include <linux/if.h>
  34 #include <linux/if_link.h>
  35
  36 #include <SNAPSHOT.h>
  37
  38 int dump_zeros = 0;
  39 int reset_history = 0;
  40 int ignore_history = 0;
  41 int no_output = 0;
  42 int json_output = 0;
  43 int no_update = 0;
  44 int scan_interval = 0;
  45 int time_constant = 0;
  46 int show_errors = 0;
  47 int pretty;
  48 double W;
  49 char **patterns;
  50 int npatterns;
  51
  52 char info_source[128];
  53 int source_mismatch;
  54
  55 #define MAXS (sizeof(struct rtnl_link_stats)/sizeof(__u32))
  56
  57 struct ifstat_ent
  58 {
  59         struct ifstat_ent       *next;
  60         char                    *name;
  61         int                     ifindex;
  62         unsigned long long      val[MAXS];
  63         double                  rate[MAXS];
  64         __u32                   ival[MAXS];
  65 };
  66
  67 static const char *stats[MAXS] = {
  68         "rx_packets",
  69         "tx_packets",
  70         "rx_bytes",
  71         "tx_bytes",
  72         "rx_errors",
  73         "tx_errors",
  74         "rx_dropped",
  75         "tx_dropped",
  76         "multicast",
  77         "collisions",
  78         "rx_length_errors",
  79         "rx_over_errors",
  80         "rx_crc_errors",
  81         "rx_frame_errors",
  82         "rx_fifo_errors",
  83         "rx_missed_errors",
  84         "tx_aborted_errors",
  85         "tx_carrier_errors",
  86         "tx_fifo_errors",
  87         "tx_heartbeat_errors",
  88         "tx_window_errors",
  89         "rx_compressed",
  90         "tx_compressed"
  91 };
  92
  93 struct ifstat_ent *kern_db;
  94 struct ifstat_ent *hist_db;
  95
  96 static int match(const char *id)
  97 {
  98         int i;
  99
 100         if (npatterns == 0)
 101                 return 1;
 102
 103         for (i=0; i<npatterns; i++) {
 104                 if (!fnmatch(patterns[i], id, 0))
 105                         return 1;
 106         }
 107         return 0;
 108 }
 109
 110 static int get_nlmsg(const struct sockaddr_nl *who,
 111                      struct nlmsghdr *m, void *arg)
 112 {
 113         struct ifinfomsg *ifi = NLMSG_DATA(m);
 114         struct rtattr * tb[IFLA_MAX+1];
 115         int len = m->nlmsg_len;
 116         struct ifstat_ent *n;
 117         int i;
 118
 119         if (m->nlmsg_type != RTM_NEWLINK)
 120                 return 0;
 121
 122         len -= NLMSG_LENGTH(sizeof(*ifi));
 123         if (len < 0)
 124                 return -1;
 125
 126         if (!(ifi->ifi_flags&IFF_UP))
 127                 return 0;
 128
 129         parse_rtattr(tb, IFLA_MAX, IFLA_RTA(ifi), len);
 130         if (tb[IFLA_IFNAME] == NULL || tb[IFLA_STATS] == NULL)
 131                 return 0;
 132
 133         n = malloc(sizeof(*n));
 134         if (!n)
 135                 abort();
 136         n->ifindex = ifi->ifi_index;
 137         n->name = strdup(RTA_DATA(tb[IFLA_IFNAME]));
 138         memcpy(&n->ival, RTA_DATA(tb[IFLA_STATS]), sizeof(n->ival));
 139         memset(&n->rate, 0, sizeof(n->rate));
 140         for (i=0; i<MAXS; i++)
 141                 n->val[i] = n->ival[i];
 142         n->next = kern_db;
 143         kern_db = n;
 144         return 0;
 145 }
 146
 147 static void load_info(void)
 148 {
 149         struct ifstat_ent *db, *n;
 150         struct rtnl_handle rth;
 151
 152         if (rtnl_open(&rth, 0) < 0)
 153                 exit(1);
 154
 155         if (rtnl_wilddump_request(&rth, AF_INET, RTM_GETLINK) < 0) {
 156                 perror("Cannot send dump request");
 157                 exit(1);
 158         }
 159
 160         if (rtnl_dump_filter(&rth, get_nlmsg, NULL) < 0) {
 161                 fprintf(stderr, "Dump terminated\n");
 162                 exit(1);
 163         }
 164
 165         rtnl_close(&rth);
 166
 167         db = kern_db;
 168         kern_db = NULL;
 169
 170         while (db) {
 171                 n = db;
 172                 db = db->next;
 173                 n->next = kern_db;
 174                 kern_db = n;
 175         }
 176 }
 177
 178 static void load_raw_table(FILE *fp)
 179 {
 180         char buf[4096];
 181         struct ifstat_ent *db = NULL;
 182         struct ifstat_ent *n;
 183
 184         while (fgets(buf, sizeof(buf), fp) != NULL) {
 185                 char *p;
 186                 char *next;
 187                 int i;
 188
 189                 if (buf[0] == '#') {
 190                         buf[strlen(buf)-1] = 0;
 191                         if (info_source[0] && strcmp(info_source, buf+1))
 192                                 source_mismatch = 1;
 193                         strncpy(info_source, buf+1, sizeof(info_source)-1);
 194                         continue;
 195                 }
 196                 if ((n = malloc(sizeof(*n))) == NULL)
 197                         abort();
 198
 199                 if (!(p = strchr(buf, ' ')))
 200                         abort();
 201                 *p++ = 0;
 202
 203                 if (sscanf(buf, "%d", &n->ifindex) != 1)
 204                         abort();
 205                 if (!(next = strchr(p, ' ')))
 206                         abort();
 207                 *next++ = 0;
 208
 209                 n->name = strdup(p);
 210                 p = next;
 211
 212                 for (i=0; i<MAXS; i++) {
 213                         unsigned rate;
 214                         if (!(next = strchr(p, ' ')))
 215                                 abort();
 216                         *next++ = 0;
 217                         if (sscanf(p, "%llu", n->val+i) != 1)
 218                                 abort();
 219                         n->ival[i] = (__u32)n->val[i];
 220                         p = next;
 221                         if (!(next = strchr(p, ' ')))
 222                                 abort();
 223                         *next++ = 0;
 224                         if (sscanf(p, "%u", &rate) != 1)
 225                                 abort();
 226                         n->rate[i] = rate;
 227                         p = next;
 228                 }
 229                 n->next = db;
 230                 db = n;
 231         }
 232
 233         while (db) {
 234                 n = db;
 235                 db = db->next;
 236                 n->next = kern_db;
 237                 kern_db = n;
 238         }
 239 }
 240
 241 static void dump_raw_db(FILE *fp, int to_hist)
 242 {
 243         json_writer_t *jw = json_output ? jsonw_new(fp) : NULL;
 244         struct ifstat_ent *n, *h;
 245
 246         h = hist_db;
 247         if (jw) {
 248                 jsonw_pretty(jw, pretty);
 249                 jsonw_name(jw, info_source);
 250                 jsonw_start_object(jw);
 251         } else
 252                 fprintf(fp, "#%s\n", info_source);
 253
 254         for (n=kern_db; n; n=n->next) {
 255                 int i;
 256                 unsigned long long *vals = n->val;
 257                 double *rates = n->rate;
 258                 if (!match(n->name)) {
 259                         struct ifstat_ent *h1;
 260                         if (!to_hist)
 261                                 continue;
 262                         for (h1 = h; h1; h1 = h1->next) {
 263                                 if (h1->ifindex == n->ifindex) {
 264                                         vals = h1->val;
 265                                         rates = h1->rate;
 266                                         h = h1->next;
 267                                         break;
 268                                 }
 269                         }
 270                 }
 271
 272                 if (jw) {
 273                         jsonw_name(jw, n->name);
 274                         jsonw_start_object(jw);
 275
 276                         for (i=0; i<MAXS && stats[i]; i++)
 277                                 jsonw_uint_field(jw, stats[i], vals[i]);
 278                         jsonw_end_object(jw);
 279                 } else {
 280                         fprintf(fp, "%d %s ", n->ifindex, n->name);
 281                         for (i=0; i<MAXS; i++)
 282                                 fprintf(fp, "%llu %u ", vals[i],
 283                                         (unsigned)rates[i]);
 284                         fprintf(fp, "\n");
 285                 }
 286         }
 287         if (jw) {
 288                 jsonw_end_object(jw);
 289                 jsonw_destroy(&jw);
 290         }
 291 }
 292
 293 /* use communication definitions of meg/kilo etc */
 294 static const unsigned long long giga = 1000000000ull;
 295 static const unsigned long long mega = 1000000;
 296 static const unsigned long long kilo = 1000;
 297
 298 static void format_rate(FILE *fp, const unsigned long long *vals,
 299                         const double *rates, int i)
 300 {
 301         char temp[64];
 302
 303         if (vals[i] > giga)
 304                 fprintf(fp, "%7lluM ", vals[i]/mega);
 305         else if (vals[i] > mega)
 306                 fprintf(fp, "%7lluK ", vals[i]/kilo);
 307         else
 308                 fprintf(fp, "%8llu ", vals[i]);
 309
 310         if (rates[i] > mega) {
 311                 sprintf(temp, "%uM", (unsigned)(rates[i]/mega));
 312                 fprintf(fp, "%-6s ", temp);
 313         } else if (rates[i] > kilo) {
 314                 sprintf(temp, "%uK", (unsigned)(rates[i]/kilo));
 315                 fprintf(fp, "%-6s ", temp);
 316         } else
 317                 fprintf(fp, "%-6u ", (unsigned)rates[i]);
 318 }
 319
 320 static void format_pair(FILE *fp, const unsigned long long *vals, int i, int k)
 321 {
 322         char temp[64];
 323         if (vals[i] > giga)
 324                 fprintf(fp, "%7lluM ", vals[i]/mega);
 325         else if (vals[i] > mega)
 326                 fprintf(fp, "%7lluK ", vals[i]/kilo);
 327         else
 328                 fprintf(fp, "%8llu ", vals[i]);
 329
 330         if (vals[k] > giga) {
 331                 sprintf(temp, "%uM", (unsigned)(vals[k]/mega));
 332                 fprintf(fp, "%-6s ", temp);
 333         } else if (vals[k] > mega) {
 334                 sprintf(temp, "%uK", (unsigned)(vals[k]/kilo));
 335                 fprintf(fp, "%-6s ", temp);
 336         } else
 337                 fprintf(fp, "%-6u ", (unsigned)vals[k]);
 338 }
 339
 340 static void print_head(FILE *fp)
 341 {
 342         fprintf(fp, "#%s\n", info_source);
 343         fprintf(fp, "%-15s ", "Interface");
 344
 345         fprintf(fp, "%8s/%-6s ", "RX Pkts", "Rate");
 346         fprintf(fp, "%8s/%-6s ", "TX Pkts", "Rate");
 347         fprintf(fp, "%8s/%-6s ", "RX Data", "Rate");
 348         fprintf(fp, "%8s/%-6s\n","TX Data", "Rate");
 349
 350         if (!show_errors) {
 351                 fprintf(fp, "%-15s ", "");
 352                 fprintf(fp, "%8s/%-6s ", "RX Errs", "Drop");
 353                 fprintf(fp, "%8s/%-6s ", "TX Errs", "Drop");
 354                 fprintf(fp, "%8s/%-6s ", "RX Over", "Rate");
 355                 fprintf(fp, "%8s/%-6s\n","TX Coll", "Rate");
 356         } else {
 357                 fprintf(fp, "%-15s ", "");
 358                 fprintf(fp, "%8s/%-6s ", "RX Errs", "Rate");
 359                 fprintf(fp, "%8s/%-6s ", "RX Drop", "Rate");
 360                 fprintf(fp, "%8s/%-6s ", "RX Over", "Rate");
 361                 fprintf(fp, "%8s/%-6s\n","RX Leng", "Rate");
 362
 363                 fprintf(fp, "%-15s ", "");
 364                 fprintf(fp, "%8s/%-6s ", "RX Crc", "Rate");
 365                 fprintf(fp, "%8s/%-6s ", "RX Frm", "Rate");
 366                 fprintf(fp, "%8s/%-6s ", "RX Fifo", "Rate");
 367                 fprintf(fp, "%8s/%-6s\n","RX Miss", "Rate");
 368
 369                 fprintf(fp, "%-15s ", "");
 370                 fprintf(fp, "%8s/%-6s ", "TX Errs", "Rate");
 371                 fprintf(fp, "%8s/%-6s ", "TX Drop", "Rate");
 372                 fprintf(fp, "%8s/%-6s ", "TX Coll", "Rate");
 373                 fprintf(fp, "%8s/%-6s\n","TX Carr", "Rate");
 374
 375                 fprintf(fp, "%-15s ", "");
 376                 fprintf(fp, "%8s/%-6s ", "TX Abrt", "Rate");
 377                 fprintf(fp, "%8s/%-6s ", "TX Fifo", "Rate");
 378                 fprintf(fp, "%8s/%-6s ", "TX Hear", "Rate");
 379                 fprintf(fp, "%8s/%-6s\n","TX Wind", "Rate");
 380         }
 381 }
 382
 383 static void print_one_json(json_writer_t *jw, const struct ifstat_ent *n,
 384                            const unsigned long long *vals)
 385 {
 386         int i, m = show_errors ? 20 : 10;
 387
 388         jsonw_name(jw, n->name);
 389         jsonw_start_object(jw);
 390
 391         for (i=0; i < m && stats[i]; i++)
 392                 jsonw_uint_field(jw, stats[i], vals[i]);
 393
 394         jsonw_end_object(jw);
 395 }
 396
 397 static void print_one_if(FILE *fp, const struct ifstat_ent *n,
 398                          const unsigned long long *vals)
 399 {
 400         int i;
 401
 402         fprintf(fp, "%-15s ", n->name);
 403         for (i=0; i<4; i++)
 404                 format_rate(fp, vals, n->rate, i);
 405         fprintf(fp, "\n");
 406
 407         if (!show_errors) {
 408                 fprintf(fp, "%-15s ", "");
 409                 format_pair(fp, vals, 4, 6);
 410                 format_pair(fp, vals, 5, 7);
 411                 format_rate(fp, vals, n->rate, 11);
 412                 format_rate(fp, vals, n->rate, 9);
 413                 fprintf(fp, "\n");
 414         } else {
 415                 fprintf(fp, "%-15s ", "");
 416                 format_rate(fp, vals, n->rate, 4);
 417                 format_rate(fp, vals, n->rate, 6);
 418                 format_rate(fp, vals, n->rate, 11);
 419                 format_rate(fp, vals, n->rate, 10);
 420                 fprintf(fp, "\n");
 421
 422                 fprintf(fp, "%-15s ", "");
 423                 format_rate(fp, vals, n->rate, 12);
 424                 format_rate(fp, vals, n->rate, 13);
 425                 format_rate(fp, vals, n->rate, 14);
 426                 format_rate(fp, vals, n->rate, 15);
 427                 fprintf(fp, "\n");
 428
 429                 fprintf(fp, "%-15s ", "");
 430                 format_rate(fp, vals, n->rate, 5);
 431                 format_rate(fp, vals, n->rate, 7);
 432                 format_rate(fp, vals, n->rate, 9);
 433                 format_rate(fp, vals, n->rate, 17);
 434                 fprintf(fp, "\n");
 435
 436                 fprintf(fp, "%-15s ", "");
 437                 format_rate(fp, vals, n->rate, 16);
 438                 format_rate(fp, vals, n->rate, 18);
 439                 format_rate(fp, vals, n->rate, 19);
 440                 format_rate(fp, vals, n->rate, 20);
 441                 fprintf(fp, "\n");
 442         }
 443 }
 444
 445 static void dump_kern_db(FILE *fp)
 446 {
 447         json_writer_t *jw = json_output ? jsonw_new(fp) : NULL;
 448         struct ifstat_ent *n;
 449
 450         if (jw) {
 451                 jsonw_pretty(jw, pretty);
 452                 jsonw_name(jw, info_source);
 453                 jsonw_start_object(jw);
 454         } else
 455                 print_head(fp);
 456
 457         for (n=kern_db; n; n=n->next) {
 458                 if (!match(n->name))
 459                         continue;
 460
 461                 if (jw)
 462                         print_one_json(jw, n, n->val);
 463                 else
 464                         print_one_if(fp, n, n->val);
 465         }
 466         if (json_output)
 467                 fprintf(fp, "\n} }\n");
 468 }
 469
 470 static void dump_incr_db(FILE *fp)
 471 {
 472         struct ifstat_ent *n, *h;
 473         json_writer_t *jw = json_output ? jsonw_new(fp) : NULL;
 474
 475         h = hist_db;
 476         if (jw) {
 477                 jsonw_pretty(jw, pretty);
 478                 jsonw_name(jw, info_source);
 479                 jsonw_start_object(jw);
 480         } else
 481                 print_head(fp);
 482
 483         for (n=kern_db; n; n=n->next) {
 484                 int i;
 485                 unsigned long long vals[MAXS];
 486                 struct ifstat_ent *h1;
 487
 488                 memcpy(vals, n->val, sizeof(vals));
 489
 490                 for (h1 = h; h1; h1 = h1->next) {
 491                         if (h1->ifindex == n->ifindex) {
 492                                 for (i = 0; i < MAXS; i++)
 493                                         vals[i] -= h1->val[i];
 494                                 h = h1->next;
 495                                 break;
 496                         }
 497                 }
 498                 if (!match(n->name))
 499                         continue;
 500
 501                 if (jw)
 502                         print_one_json(jw, n, n->val);
 503                 else
 504                         print_one_if(fp, n, vals);
 505         }
 506
 507         if (jw) {
 508                 jsonw_end_object(jw);
 509                 jsonw_destroy(&jw);
 510         }
 511 }
 512
 513 static int children;
 514
 515 static void sigchild(int signo)
 516 {
 517 }
 518
 519 static void update_db(int interval)
 520 {
 521         struct ifstat_ent *n, *h;
 522
 523         n = kern_db;
 524         kern_db = NULL;
 525
 526         load_info();
 527
 528         h = kern_db;
 529         kern_db = n;
 530
 531         for (n = kern_db; n; n = n->next) {
 532                 struct ifstat_ent *h1;
 533                 for (h1 = h; h1; h1 = h1->next) {
 534                         if (h1->ifindex == n->ifindex) {
 535                                 int i;
 536                                 for (i = 0; i < MAXS; i++) {
 537                                         if ((long)(h1->ival[i] - n->ival[i]) < 0) {
 538                                                 memset(n->ival, 0, sizeof(n->ival));
 539                                                 break;
 540                                         }
 541                                 }
 542                                 for (i = 0; i < MAXS; i++) {
 543                                         double sample;
 544                                         unsigned long incr = h1->ival[i] - n->ival[i];
 545                                         n->val[i] += incr;
 546                                         n->ival[i] = h1->ival[i];
 547                                         sample = (double)(incr*1000)/interval;
 548                                         if (interval >= scan_interval) {
 549                                                 n->rate[i] += W*(sample-n->rate[i]);
 550                                         } else if (interval >= 1000) {
 551                                                 if (interval >= time_constant) {
 552                                                         n->rate[i] = sample;
 553                                                 } else {
 554                                                         double w = W*(double)interval/scan_interval;
 555                                                         n->rate[i] += w*(sample-n->rate[i]);
 556                                                 }
 557                                         }
 558                                 }
 559
 560                                 while (h != h1) {
 561                                         struct ifstat_ent *tmp = h;
 562                                         h = h->next;
 563                                         free(tmp->name);
 564                                         free(tmp);
 565                                 };
 566                                 h = h1->next;
 567                                 free(h1->name);
 568                                 free(h1);
 569                                 break;
 570                         }
 571                 }
 572         }
 573 }
 574
 575 #define T_DIFF(a,b) (((a).tv_sec-(b).tv_sec)*1000 + ((a).tv_usec-(b).tv_usec)/1000)
 576
 577
 578 static void server_loop(int fd)
 579 {
 580         struct timeval snaptime = { 0 };
 581         struct pollfd p;
 582         p.fd = fd;
 583         p.events = p.revents = POLLIN;
 584
 585         sprintf(info_source, "%d.%lu sampling_interval=%d time_const=%d",
 586                 getpid(), (unsigned long)random(), scan_interval/1000, time_constant/1000);
 587
 588         load_info();
 589
 590         for (;;) {
 591                 int status;
 592                 int tdiff;
 593                 struct timeval now;
 594
 595                 gettimeofday(&now, NULL);
 596                 tdiff = T_DIFF(now, snaptime);
 597                 if (tdiff >= scan_interval) {
 598                         update_db(tdiff);
 599                         snaptime = now;
 600                         tdiff = 0;
 601                 }
 602
 603                 if (poll(&p, 1, tdiff + scan_interval) > 0
 604                     && (p.revents&POLLIN)) {
 605                         int clnt = accept(fd, NULL, NULL);
 606                         if (clnt >= 0) {
 607                                 pid_t pid;
 608                                 if (children >= 5) {
 609                                         close(clnt);
 610                                 } else if ((pid = fork()) != 0) {
 611                                         if (pid>0)
 612                                                 children++;
 613                                         close(clnt);
 614                                 } else {
 615                                         FILE *fp = fdopen(clnt, "w");
 616                                         if (fp) {
 617                                                 if (tdiff > 0)
 618                                                         update_db(tdiff);
 619                                                 dump_raw_db(fp, 0);
 620                                         }
 621                                         exit(0);
 622                                 }
 623                         }
 624                 }
 625                 while (children && waitpid(-1, &status, WNOHANG) > 0)
 626                         children--;
 627         }
 628 }
 629
 630 static int verify_forging(int fd)
 631 {
 632         struct ucred cred;
 633         socklen_t olen = sizeof(cred);
 634
 635         if (getsockopt(fd, SOL_SOCKET, SO_PEERCRED, (void*)&cred, &olen) ||
 636             olen < sizeof(cred))
 637                 return -1;
 638         if (cred.uid == getuid() || cred.uid == 0)
 639                 return 0;
 640         return -1;
 641 }
 642
 643 static void usage(void) __attribute__((noreturn));
 644
 645 static void usage(void)
 646 {
 647         fprintf(stderr,
 648 "Usage: ifstat [OPTION] [ PATTERN [ PATTERN ] ]\n"
 649 "   -h, --help          this message\n"
 650 "   -a, --ignore        ignore history\n"
 651 "   -d, --scan=SECS     sample every statistics every SECS\n"
 652 "   -e, --errors        show errors\n"
 653 "   -j, --json          format output in JSON\n"
 654 "   -n, --nooutput      do history only\n"
 655 "   -p, --pretty        pretty print\n"
 656 "   -r, --reset         reset history\n"
 657 "   -s, --noupdate      don\'t update history\n"
 658 "   -t, --interval=SECS report average over the last SECS\n"
 659 "   -V, --version       output version information\n"
 660 "   -z, --zeros         show entries with zero activity\n");
 661
 662         exit(-1);
 663 }
 664
 665 static const struct option longopts[] = {
 666         { "help", 0, 0, 'h' },
 667         { "ignore",  0,  0, 'a' },
 668         { "scan", 1, 0, 'd'},
 669         { "errors", 0, 0, 'e' },
 670         { "nooutput", 0, 0, 'n' },
 671         { "json", 0, 0, 'j' },
 672         { "reset", 0, 0, 'r' },
 673         { "pretty", 0, 0, 'p' },
 674         { "noupdate", 0, 0, 's' },
 675         { "interval", 1, 0, 't' },
 676         { "version", 0, 0, 'V' },
 677         { "zeros", 0, 0, 'z' },
 678         { 0 }
 679 };
 680
 681 int main(int argc, char *argv[])
 682 {
 683         char hist_name[128];
 684         struct sockaddr_un sun;
 685         FILE *hist_fp = NULL;
 686         int ch;
 687         int fd;
 688
 689         while ((ch = getopt_long(argc, argv, "hjpvVzrnasd:t:e",
 690                         longopts, NULL)) != EOF) {
 691                 switch(ch) {
 692                 case 'z':
 693                         dump_zeros = 1;
 694                         break;
 695                 case 'r':
 696                         reset_history = 1;
 697                         break;
 698                 case 'a':
 699                         ignore_history = 1;
 700                         break;
 701                 case 's':
 702                         no_update = 1;
 703                         break;
 704                 case 'n':
 705                         no_output = 1;
 706                         break;
 707                 case 'e':
 708                         show_errors = 1;
 709                         break;
 710                 case 'j':
 711                         json_output = 1;
 712                         break;
 713                 case 'p':
 714                         pretty = 1;
 715                         break;
 716                 case 'd':
 717                         scan_interval = atoi(optarg) * 1000;
 718                         if (scan_interval <= 0) {
 719                                 fprintf(stderr, "ifstat: invalid scan interval\n");
 720                                 exit(-1);
 721                         }
 722                         break;
 723                 case 't':
 724                         time_constant = atoi(optarg);
 725                         if (time_constant <= 0) {
 726                                 fprintf(stderr, "ifstat: invalid time constant divisor\n");
 727                                 exit(-1);
 728                         }
 729                         break;
 730                 case 'v':
 731                 case 'V':
 732                         printf("ifstat utility, iproute2-ss%s\n", SNAPSHOT);
 733                         exit(0);
 734                 case 'h':
 735                 case '?':
 736                 default:
 737                         usage();
 738                 }
 739         }
 740
 741         argc -= optind;
 742         argv += optind;
 743
 744         sun.sun_family = AF_UNIX;
 745         sun.sun_path[0] = 0;
 746         sprintf(sun.sun_path+1, "ifstat%d", getuid());
 747
 748         if (scan_interval > 0) {
 749                 if (time_constant == 0)
 750                         time_constant = 60;
 751                 time_constant *= 1000;
 752                 W = 1 - 1/exp(log(10)*(double)scan_interval/time_constant);
 753                 if ((fd = socket(AF_UNIX, SOCK_STREAM, 0)) < 0) {
 754                         perror("ifstat: socket");
 755                         exit(-1);
 756                 }
 757                 if (bind(fd, (struct sockaddr*)&sun, 2+1+strlen(sun.sun_path+1)) < 0) {
 758                         perror("ifstat: bind");
 759                         exit(-1);
 760                 }
 761                 if (listen(fd, 5) < 0) {
 762                         perror("ifstat: listen");
 763                         exit(-1);
 764                 }
 765                 if (daemon(0, 0)) {
 766                         perror("ifstat: daemon");
 767                         exit(-1);
 768                 }
 769                 signal(SIGPIPE, SIG_IGN);
 770                 signal(SIGCHLD, sigchild);
 771                 server_loop(fd);
 772                 exit(0);
 773         }
 774
 775         patterns = argv;
 776         npatterns = argc;
 777
 778         if (getenv("IFSTAT_HISTORY"))
 779                 snprintf(hist_name, sizeof(hist_name),
 780                          "%s", getenv("IFSTAT_HISTORY"));
 781         else
 782                 snprintf(hist_name, sizeof(hist_name),
 783                          "%s/.ifstat.u%d", P_tmpdir, getuid());
 784
 785         if (reset_history)
 786                 unlink(hist_name);
 787
 788         if (!ignore_history || !no_update) {
 789                 struct stat stb;
 790
 791                 fd = open(hist_name, O_RDWR|O_CREAT|O_NOFOLLOW, 0600);
 792                 if (fd < 0) {
 793                         perror("ifstat: open history file");
 794                         exit(-1);
 795                 }
 796                 if ((hist_fp = fdopen(fd, "r+")) == NULL) {
 797                         perror("ifstat: fdopen history file");
 798                         exit(-1);
 799                 }
 800                 if (flock(fileno(hist_fp), LOCK_EX)) {
 801                         perror("ifstat: flock history file");
 802                         exit(-1);
 803                 }
 804                 if (fstat(fileno(hist_fp), &stb) != 0) {
 805                         perror("ifstat: fstat history file");
 806                         exit(-1);
 807                 }
 808                 if (stb.st_nlink != 1 || stb.st_uid != getuid()) {
 809                         fprintf(stderr, "ifstat: something is so wrong with history file, that I prefer not to proceed.\n");
 810                         exit(-1);
 811                 }
 812                 if (!ignore_history) {
 813                         FILE *tfp;
 814                         long uptime = -1;
 815                         if ((tfp = fopen("/proc/uptime", "r")) != NULL) {
 816                                 if (fscanf(tfp, "%ld", &uptime) != 1)
 817                                         uptime = -1;
 818                                 fclose(tfp);
 819                         }
 820                         if (uptime >= 0 && time(NULL) >= stb.st_mtime+uptime) {
 821                                 fprintf(stderr, "ifstat: history is aged out, resetting\n");
 822                                 ftruncate(fileno(hist_fp), 0);
 823                         }
 824                 }
 825
 826                 load_raw_table(hist_fp);
 827
 828                 hist_db = kern_db;
 829                 kern_db = NULL;
 830         }
 831
 832         if ((fd = socket(AF_UNIX, SOCK_STREAM, 0)) >= 0 &&
 833             (connect(fd, (struct sockaddr*)&sun, 2+1+strlen(sun.sun_path+1)) == 0
 834              || (strcpy(sun.sun_path+1, "ifstat0"),
 835                  connect(fd, (struct sockaddr*)&sun, 2+1+strlen(sun.sun_path+1)) == 0))
 836             && verify_forging(fd) == 0) {
 837                 FILE *sfp = fdopen(fd, "r");
 838                 load_raw_table(sfp);
 839                 if (hist_db && source_mismatch) {
 840                         fprintf(stderr, "ifstat: history is stale, ignoring it.\n");
 841                         hist_db = NULL;
 842                 }
 843                 fclose(sfp);
 844         } else {
 845                 if (fd >= 0)
 846                         close(fd);
 847                 if (hist_db && info_source[0] && strcmp(info_source, "kernel")) {
 848                         fprintf(stderr, "ifstat: history is stale, ignoring it.\n");
 849                         hist_db = NULL;
 850                         info_source[0] = 0;
 851                 }
 852                 load_info();
 853                 if (info_source[0] == 0)
 854                         strcpy(info_source, "kernel");
 855         }
 856
 857         if (!no_output) {
 858                 if (ignore_history || hist_db == NULL)
 859                         dump_kern_db(stdout);
 860                 else
 861                         dump_incr_db(stdout);
 862         }
 863
 864         if (!no_update) {
 865                 ftruncate(fileno(hist_fp), 0);
 866                 rewind(hist_fp);
 867
 868                 json_output = 0;
 869                 dump_raw_db(hist_fp, 1);
 870                 fclose(hist_fp);
 871         }
 872         exit(0);
 873 }