iproute2/misc/ifstat.c
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   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 <linux/if.h>
  32#include <linux/if_link.h>
  33
  34#include "libnetlink.h"
  35#include "json_writer.h"
  36#include "version.h"
  37#include "utils.h"
  38
  39int dump_zeros;
  40int reset_history;
  41int ignore_history;
  42int no_output;
  43int json_output;
  44int no_update;
  45int scan_interval;
  46int time_constant;
  47int show_errors;
  48double W;
  49char **patterns;
  50int npatterns;
  51bool is_extended;
  52int filter_type;
  53int sub_type;
  54
  55char info_source[128];
  56int source_mismatch;
  57
  58#define MAXS (sizeof(struct rtnl_link_stats)/sizeof(__u32))
  59#define NO_SUB_TYPE 0xffff
  60
  61struct ifstat_ent {
  62        struct ifstat_ent       *next;
  63        char                    *name;
  64        int                     ifindex;
  65        __u64                   val[MAXS];
  66        double                  rate[MAXS];
  67        __u32                   ival[MAXS];
  68};
  69
  70static const char *stats[MAXS] = {
  71        "rx_packets",
  72        "tx_packets",
  73        "rx_bytes",
  74        "tx_bytes",
  75        "rx_errors",
  76        "tx_errors",
  77        "rx_dropped",
  78        "tx_dropped",
  79        "multicast",
  80        "collisions",
  81        "rx_length_errors",
  82        "rx_over_errors",
  83        "rx_crc_errors",
  84        "rx_frame_errors",
  85        "rx_fifo_errors",
  86        "rx_missed_errors",
  87        "tx_aborted_errors",
  88        "tx_carrier_errors",
  89        "tx_fifo_errors",
  90        "tx_heartbeat_errors",
  91        "tx_window_errors",
  92        "rx_compressed",
  93        "tx_compressed"
  94};
  95
  96struct ifstat_ent *kern_db;
  97struct ifstat_ent *hist_db;
  98
  99static int match(const char *id)
 100{
 101        int i;
 102
 103        if (npatterns == 0)
 104                return 1;
 105
 106        for (i = 0; i < npatterns; i++) {
 107                if (!fnmatch(patterns[i], id, FNM_CASEFOLD))
 108                        return 1;
 109        }
 110        return 0;
 111}
 112
 113static int get_nlmsg_extended(struct nlmsghdr *m, void *arg)
 114{
 115        struct if_stats_msg *ifsm = NLMSG_DATA(m);
 116        struct rtattr *tb[IFLA_STATS_MAX+1];
 117        int len = m->nlmsg_len;
 118        struct ifstat_ent *n;
 119
 120        if (m->nlmsg_type != RTM_NEWSTATS)
 121                return 0;
 122
 123        len -= NLMSG_LENGTH(sizeof(*ifsm));
 124        if (len < 0)
 125                return -1;
 126
 127        parse_rtattr(tb, IFLA_STATS_MAX, IFLA_STATS_RTA(ifsm), len);
 128        if (tb[filter_type] == NULL)
 129                return 0;
 130
 131        n = malloc(sizeof(*n));
 132        if (!n)
 133                abort();
 134
 135        n->ifindex = ifsm->ifindex;
 136        n->name = strdup(ll_index_to_name(ifsm->ifindex));
 137
 138        if (sub_type == NO_SUB_TYPE) {
 139                memcpy(&n->val, RTA_DATA(tb[filter_type]), sizeof(n->val));
 140        } else {
 141                struct rtattr *attr;
 142
 143                attr = parse_rtattr_one_nested(sub_type, tb[filter_type]);
 144                if (attr == NULL) {
 145                        free(n);
 146                        return 0;
 147                }
 148                memcpy(&n->val, RTA_DATA(attr), sizeof(n->val));
 149        }
 150        memset(&n->rate, 0, sizeof(n->rate));
 151        n->next = kern_db;
 152        kern_db = n;
 153        return 0;
 154}
 155
 156static int get_nlmsg(struct nlmsghdr *m, void *arg)
 157{
 158        struct ifinfomsg *ifi = NLMSG_DATA(m);
 159        struct rtattr *tb[IFLA_MAX+1];
 160        int len = m->nlmsg_len;
 161        struct ifstat_ent *n;
 162        int i;
 163
 164        if (m->nlmsg_type != RTM_NEWLINK)
 165                return 0;
 166
 167        len -= NLMSG_LENGTH(sizeof(*ifi));
 168        if (len < 0)
 169                return -1;
 170
 171        if (!(ifi->ifi_flags&IFF_UP))
 172                return 0;
 173
 174        parse_rtattr(tb, IFLA_MAX, IFLA_RTA(ifi), len);
 175        if (tb[IFLA_IFNAME] == NULL || tb[IFLA_STATS] == NULL)
 176                return 0;
 177
 178        n = malloc(sizeof(*n));
 179        if (!n)
 180                abort();
 181        n->ifindex = ifi->ifi_index;
 182        n->name = strdup(RTA_DATA(tb[IFLA_IFNAME]));
 183        memcpy(&n->ival, RTA_DATA(tb[IFLA_STATS]), sizeof(n->ival));
 184        memset(&n->rate, 0, sizeof(n->rate));
 185        for (i = 0; i < MAXS; i++)
 186                n->val[i] = n->ival[i];
 187        n->next = kern_db;
 188        kern_db = n;
 189        return 0;
 190}
 191
 192static void load_info(void)
 193{
 194        struct ifstat_ent *db, *n;
 195        struct rtnl_handle rth;
 196        __u32 filter_mask;
 197
 198        if (rtnl_open(&rth, 0) < 0)
 199                exit(1);
 200
 201        if (is_extended) {
 202                ll_init_map(&rth);
 203                filter_mask = IFLA_STATS_FILTER_BIT(filter_type);
 204                if (rtnl_statsdump_req_filter(&rth, AF_UNSPEC,
 205                                              filter_mask) < 0) {
 206                        perror("Cannot send dump request");
 207                        exit(1);
 208                }
 209
 210                if (rtnl_dump_filter(&rth, get_nlmsg_extended, NULL) < 0) {
 211                        fprintf(stderr, "Dump terminated\n");
 212                        exit(1);
 213                }
 214        } else {
 215                if (rtnl_linkdump_req(&rth, AF_INET) < 0) {
 216                        perror("Cannot send dump request");
 217                        exit(1);
 218                }
 219
 220                if (rtnl_dump_filter(&rth, get_nlmsg, NULL) < 0) {
 221                        fprintf(stderr, "Dump terminated\n");
 222                        exit(1);
 223                }
 224        }
 225
 226        rtnl_close(&rth);
 227
 228        db = kern_db;
 229        kern_db = NULL;
 230
 231        while (db) {
 232                n = db;
 233                db = db->next;
 234                n->next = kern_db;
 235                kern_db = n;
 236        }
 237}
 238
 239static void load_raw_table(FILE *fp)
 240{
 241        char buf[4096];
 242        struct ifstat_ent *db = NULL;
 243        struct ifstat_ent *n;
 244
 245        while (fgets(buf, sizeof(buf), fp) != NULL) {
 246                char *p;
 247                char *next;
 248                int i;
 249
 250                if (buf[0] == '#') {
 251                        buf[strlen(buf)-1] = 0;
 252                        if (info_source[0] && strcmp(info_source, buf+1))
 253                                source_mismatch = 1;
 254                        strlcpy(info_source, buf+1, sizeof(info_source));
 255                        continue;
 256                }
 257                if ((n = malloc(sizeof(*n))) == NULL)
 258                        abort();
 259
 260                if (!(p = strchr(buf, ' ')))
 261                        abort();
 262                *p++ = 0;
 263
 264                if (sscanf(buf, "%d", &n->ifindex) != 1)
 265                        abort();
 266                if (!(next = strchr(p, ' ')))
 267                        abort();
 268                *next++ = 0;
 269
 270                n->name = strdup(p);
 271                p = next;
 272
 273                for (i = 0; i < MAXS; i++) {
 274                        unsigned int rate;
 275
 276                        if (!(next = strchr(p, ' ')))
 277                                abort();
 278                        *next++ = 0;
 279                        if (sscanf(p, "%llu", n->val+i) != 1)
 280                                abort();
 281                        n->ival[i] = (__u32)n->val[i];
 282                        p = next;
 283                        if (!(next = strchr(p, ' ')))
 284                                abort();
 285                        *next++ = 0;
 286                        if (sscanf(p, "%u", &rate) != 1)
 287                                abort();
 288                        n->rate[i] = rate;
 289                        p = next;
 290                }
 291                n->next = db;
 292                db = n;
 293        }
 294
 295        while (db) {
 296                n = db;
 297                db = db->next;
 298                n->next = kern_db;
 299                kern_db = n;
 300        }
 301}
 302
 303static void dump_raw_db(FILE *fp, int to_hist)
 304{
 305        json_writer_t *jw = json_output ? jsonw_new(fp) : NULL;
 306        struct ifstat_ent *n, *h;
 307
 308        h = hist_db;
 309        if (jw) {
 310                jsonw_start_object(jw);
 311                jsonw_pretty(jw, pretty);
 312                jsonw_name(jw, info_source);
 313                jsonw_start_object(jw);
 314        } else
 315                fprintf(fp, "#%s\n", info_source);
 316
 317        for (n = kern_db; n; n = n->next) {
 318                int i;
 319                unsigned long long *vals = n->val;
 320                double *rates = n->rate;
 321
 322                if (!match(n->name)) {
 323                        struct ifstat_ent *h1;
 324
 325                        if (!to_hist)
 326                                continue;
 327                        for (h1 = h; h1; h1 = h1->next) {
 328                                if (h1->ifindex == n->ifindex) {
 329                                        vals = h1->val;
 330                                        rates = h1->rate;
 331                                        h = h1->next;
 332                                        break;
 333                                }
 334                        }
 335                }
 336
 337                if (jw) {
 338                        jsonw_name(jw, n->name);
 339                        jsonw_start_object(jw);
 340
 341                        for (i = 0; i < MAXS && stats[i]; i++)
 342                                jsonw_uint_field(jw, stats[i], vals[i]);
 343                        jsonw_end_object(jw);
 344                } else {
 345                        fprintf(fp, "%d %s ", n->ifindex, n->name);
 346                        for (i = 0; i < MAXS; i++)
 347                                fprintf(fp, "%llu %u ", vals[i],
 348                                        (unsigned int)rates[i]);
 349                        fprintf(fp, "\n");
 350                }
 351        }
 352        if (jw) {
 353                jsonw_end_object(jw);
 354
 355                jsonw_end_object(jw);
 356                jsonw_destroy(&jw);
 357        }
 358}
 359
 360/* use communication definitions of meg/kilo etc */
 361static const unsigned long long giga = 1000000000ull;
 362static const unsigned long long mega = 1000000;
 363static const unsigned long long kilo = 1000;
 364
 365static void format_rate(FILE *fp, const unsigned long long *vals,
 366                        const double *rates, int i)
 367{
 368        char temp[64];
 369
 370        if (vals[i] > giga)
 371                fprintf(fp, "%7lluM ", vals[i]/mega);
 372        else if (vals[i] > mega)
 373                fprintf(fp, "%7lluK ", vals[i]/kilo);
 374        else
 375                fprintf(fp, "%8llu ", vals[i]);
 376
 377        if (rates[i] > mega) {
 378                sprintf(temp, "%uM", (unsigned int)(rates[i]/mega));
 379                fprintf(fp, "%-6s ", temp);
 380        } else if (rates[i] > kilo) {
 381                sprintf(temp, "%uK", (unsigned int)(rates[i]/kilo));
 382                fprintf(fp, "%-6s ", temp);
 383        } else
 384                fprintf(fp, "%-6u ", (unsigned int)rates[i]);
 385}
 386
 387static void format_pair(FILE *fp, const unsigned long long *vals, int i, int k)
 388{
 389        char temp[64];
 390
 391        if (vals[i] > giga)
 392                fprintf(fp, "%7lluM ", vals[i]/mega);
 393        else if (vals[i] > mega)
 394                fprintf(fp, "%7lluK ", vals[i]/kilo);
 395        else
 396                fprintf(fp, "%8llu ", vals[i]);
 397
 398        if (vals[k] > giga) {
 399                sprintf(temp, "%uM", (unsigned int)(vals[k]/mega));
 400                fprintf(fp, "%-6s ", temp);
 401        } else if (vals[k] > mega) {
 402                sprintf(temp, "%uK", (unsigned int)(vals[k]/kilo));
 403                fprintf(fp, "%-6s ", temp);
 404        } else
 405                fprintf(fp, "%-6u ", (unsigned int)vals[k]);
 406}
 407
 408static void print_head(FILE *fp)
 409{
 410        fprintf(fp, "#%s\n", info_source);
 411        fprintf(fp, "%-15s ", "Interface");
 412
 413        fprintf(fp, "%8s/%-6s ", "RX Pkts", "Rate");
 414        fprintf(fp, "%8s/%-6s ", "TX Pkts", "Rate");
 415        fprintf(fp, "%8s/%-6s ", "RX Data", "Rate");
 416        fprintf(fp, "%8s/%-6s\n", "TX Data", "Rate");
 417
 418        if (!show_errors) {
 419                fprintf(fp, "%-15s ", "");
 420                fprintf(fp, "%8s/%-6s ", "RX Errs", "Drop");
 421                fprintf(fp, "%8s/%-6s ", "TX Errs", "Drop");
 422                fprintf(fp, "%8s/%-6s ", "RX Over", "Rate");
 423                fprintf(fp, "%8s/%-6s\n", "TX Coll", "Rate");
 424        } else {
 425                fprintf(fp, "%-15s ", "");
 426                fprintf(fp, "%8s/%-6s ", "RX Errs", "Rate");
 427                fprintf(fp, "%8s/%-6s ", "RX Drop", "Rate");
 428                fprintf(fp, "%8s/%-6s ", "RX Over", "Rate");
 429                fprintf(fp, "%8s/%-6s\n", "RX Leng", "Rate");
 430
 431                fprintf(fp, "%-15s ", "");
 432                fprintf(fp, "%8s/%-6s ", "RX Crc", "Rate");
 433                fprintf(fp, "%8s/%-6s ", "RX Frm", "Rate");
 434                fprintf(fp, "%8s/%-6s ", "RX Fifo", "Rate");
 435                fprintf(fp, "%8s/%-6s\n", "RX Miss", "Rate");
 436
 437                fprintf(fp, "%-15s ", "");
 438                fprintf(fp, "%8s/%-6s ", "TX Errs", "Rate");
 439                fprintf(fp, "%8s/%-6s ", "TX Drop", "Rate");
 440                fprintf(fp, "%8s/%-6s ", "TX Coll", "Rate");
 441                fprintf(fp, "%8s/%-6s\n", "TX Carr", "Rate");
 442
 443                fprintf(fp, "%-15s ", "");
 444                fprintf(fp, "%8s/%-6s ", "TX Abrt", "Rate");
 445                fprintf(fp, "%8s/%-6s ", "TX Fifo", "Rate");
 446                fprintf(fp, "%8s/%-6s ", "TX Hear", "Rate");
 447                fprintf(fp, "%8s/%-6s\n", "TX Wind", "Rate");
 448        }
 449}
 450
 451static void print_one_json(json_writer_t *jw, const struct ifstat_ent *n,
 452                           const unsigned long long *vals)
 453{
 454        int i, m = show_errors ? 20 : 10;
 455
 456        jsonw_name(jw, n->name);
 457        jsonw_start_object(jw);
 458
 459        for (i = 0; i < m && stats[i]; i++)
 460                jsonw_uint_field(jw, stats[i], vals[i]);
 461
 462        jsonw_end_object(jw);
 463}
 464
 465static void print_one_if(FILE *fp, const struct ifstat_ent *n,
 466                         const unsigned long long *vals)
 467{
 468        int i;
 469
 470        fprintf(fp, "%-15s ", n->name);
 471        for (i = 0; i < 4; i++)
 472                format_rate(fp, vals, n->rate, i);
 473        fprintf(fp, "\n");
 474
 475        if (!show_errors) {
 476                fprintf(fp, "%-15s ", "");
 477                format_pair(fp, vals, 4, 6);
 478                format_pair(fp, vals, 5, 7);
 479                format_rate(fp, vals, n->rate, 11);
 480                format_rate(fp, vals, n->rate, 9);
 481                fprintf(fp, "\n");
 482        } else {
 483                fprintf(fp, "%-15s ", "");
 484                format_rate(fp, vals, n->rate, 4);
 485                format_rate(fp, vals, n->rate, 6);
 486                format_rate(fp, vals, n->rate, 11);
 487                format_rate(fp, vals, n->rate, 10);
 488                fprintf(fp, "\n");
 489
 490                fprintf(fp, "%-15s ", "");
 491                format_rate(fp, vals, n->rate, 12);
 492                format_rate(fp, vals, n->rate, 13);
 493                format_rate(fp, vals, n->rate, 14);
 494                format_rate(fp, vals, n->rate, 15);
 495                fprintf(fp, "\n");
 496
 497                fprintf(fp, "%-15s ", "");
 498                format_rate(fp, vals, n->rate, 5);
 499                format_rate(fp, vals, n->rate, 7);
 500                format_rate(fp, vals, n->rate, 9);
 501                format_rate(fp, vals, n->rate, 17);
 502                fprintf(fp, "\n");
 503
 504                fprintf(fp, "%-15s ", "");
 505                format_rate(fp, vals, n->rate, 16);
 506                format_rate(fp, vals, n->rate, 18);
 507                format_rate(fp, vals, n->rate, 19);
 508                format_rate(fp, vals, n->rate, 20);
 509                fprintf(fp, "\n");
 510        }
 511}
 512
 513static void dump_kern_db(FILE *fp)
 514{
 515        json_writer_t *jw = json_output ? jsonw_new(fp) : NULL;
 516        struct ifstat_ent *n;
 517
 518        if (jw) {
 519                jsonw_start_object(jw);
 520                jsonw_pretty(jw, pretty);
 521                jsonw_name(jw, info_source);
 522                jsonw_start_object(jw);
 523        } else
 524                print_head(fp);
 525
 526        for (n = kern_db; n; n = n->next) {
 527                if (!match(n->name))
 528                        continue;
 529
 530                if (jw)
 531                        print_one_json(jw, n, n->val);
 532                else
 533                        print_one_if(fp, n, n->val);
 534        }
 535        if (jw) {
 536                jsonw_end_object(jw);
 537
 538                jsonw_end_object(jw);
 539                jsonw_destroy(&jw);
 540        }
 541}
 542
 543static void dump_incr_db(FILE *fp)
 544{
 545        struct ifstat_ent *n, *h;
 546        json_writer_t *jw = json_output ? jsonw_new(fp) : NULL;
 547
 548        h = hist_db;
 549        if (jw) {
 550                jsonw_start_object(jw);
 551                jsonw_pretty(jw, pretty);
 552                jsonw_name(jw, info_source);
 553                jsonw_start_object(jw);
 554        } else
 555                print_head(fp);
 556
 557        for (n = kern_db; n; n = n->next) {
 558                int i;
 559                unsigned long long vals[MAXS];
 560                struct ifstat_ent *h1;
 561
 562                memcpy(vals, n->val, sizeof(vals));
 563
 564                for (h1 = h; h1; h1 = h1->next) {
 565                        if (h1->ifindex == n->ifindex) {
 566                                for (i = 0; i < MAXS; i++)
 567                                        vals[i] -= h1->val[i];
 568                                h = h1->next;
 569                                break;
 570                        }
 571                }
 572                if (!match(n->name))
 573                        continue;
 574
 575                if (jw)
 576                        print_one_json(jw, n, n->val);
 577                else
 578                        print_one_if(fp, n, vals);
 579        }
 580
 581        if (jw) {
 582                jsonw_end_object(jw);
 583
 584                jsonw_end_object(jw);
 585                jsonw_destroy(&jw);
 586        }
 587}
 588
 589static int children;
 590
 591static void sigchild(int signo)
 592{
 593}
 594
 595static void update_db(int interval)
 596{
 597        struct ifstat_ent *n, *h;
 598
 599        n = kern_db;
 600        kern_db = NULL;
 601
 602        load_info();
 603
 604        h = kern_db;
 605        kern_db = n;
 606
 607        for (n = kern_db; n; n = n->next) {
 608                struct ifstat_ent *h1;
 609
 610                for (h1 = h; h1; h1 = h1->next) {
 611                        if (h1->ifindex == n->ifindex) {
 612                                int i;
 613
 614                                for (i = 0; i < MAXS; i++) {
 615                                        if ((long)(h1->ival[i] - n->ival[i]) < 0) {
 616                                                memset(n->ival, 0, sizeof(n->ival));
 617                                                break;
 618                                        }
 619                                }
 620                                for (i = 0; i < MAXS; i++) {
 621                                        double sample;
 622                                        __u64 incr;
 623
 624                                        if (is_extended) {
 625                                                incr = h1->val[i] - n->val[i];
 626                                                n->val[i] = h1->val[i];
 627                                        } else {
 628                                                incr = (__u32) (h1->ival[i] - n->ival[i]);
 629                                                n->val[i] += incr;
 630                                                n->ival[i] = h1->ival[i];
 631                                        }
 632
 633                                        sample = (double)(incr*1000)/interval;
 634                                        if (interval >= scan_interval) {
 635                                                n->rate[i] += W*(sample-n->rate[i]);
 636                                        } else if (interval >= 1000) {
 637                                                if (interval >= time_constant) {
 638                                                        n->rate[i] = sample;
 639                                                } else {
 640                                                        double w = W*(double)interval/scan_interval;
 641
 642                                                        n->rate[i] += w*(sample-n->rate[i]);
 643                                                }
 644                                        }
 645                                }
 646
 647                                while (h != h1) {
 648                                        struct ifstat_ent *tmp = h;
 649
 650                                        h = h->next;
 651                                        free(tmp->name);
 652                                        free(tmp);
 653                                };
 654                                h = h1->next;
 655                                free(h1->name);
 656                                free(h1);
 657                                break;
 658                        }
 659                }
 660        }
 661}
 662
 663#define T_DIFF(a, b) (((a).tv_sec-(b).tv_sec)*1000 + ((a).tv_usec-(b).tv_usec)/1000)
 664
 665
 666static void server_loop(int fd)
 667{
 668        struct timeval snaptime = { 0 };
 669        struct pollfd p;
 670
 671        p.fd = fd;
 672        p.events = p.revents = POLLIN;
 673
 674        sprintf(info_source, "%d.%lu sampling_interval=%d time_const=%d",
 675                getpid(), (unsigned long)random(), scan_interval/1000, time_constant/1000);
 676
 677        load_info();
 678
 679        for (;;) {
 680                int status;
 681                time_t tdiff;
 682                struct timeval now;
 683
 684                gettimeofday(&now, NULL);
 685                tdiff = T_DIFF(now, snaptime);
 686                if (tdiff >= scan_interval) {
 687                        update_db(tdiff);
 688                        snaptime = now;
 689                        tdiff = 0;
 690                }
 691
 692                if (poll(&p, 1, scan_interval - tdiff) > 0
 693                    && (p.revents&POLLIN)) {
 694                        int clnt = accept(fd, NULL, NULL);
 695
 696                        if (clnt >= 0) {
 697                                pid_t pid;
 698
 699                                if (children >= 5) {
 700                                        close(clnt);
 701                                } else if ((pid = fork()) != 0) {
 702                                        if (pid > 0)
 703                                                children++;
 704                                        close(clnt);
 705                                } else {
 706                                        FILE *fp = fdopen(clnt, "w");
 707
 708                                        if (fp)
 709                                                dump_raw_db(fp, 0);
 710                                        exit(0);
 711                                }
 712                        }
 713                }
 714                while (children && waitpid(-1, &status, WNOHANG) > 0)
 715                        children--;
 716        }
 717}
 718
 719static int verify_forging(int fd)
 720{
 721        struct ucred cred;
 722        socklen_t olen = sizeof(cred);
 723
 724        if (getsockopt(fd, SOL_SOCKET, SO_PEERCRED, (void *)&cred, &olen) ||
 725            olen < sizeof(cred))
 726                return -1;
 727        if (cred.uid == getuid() || cred.uid == 0)
 728                return 0;
 729        return -1;
 730}
 731
 732static void xstat_usage(void)
 733{
 734        fprintf(stderr,
 735"Usage: ifstat supported xstats:\n"
 736"       cpu_hits       Counts only packets that went via the CPU.\n");
 737}
 738
 739struct extended_stats_options_t {
 740        char *name;
 741        int id;
 742        int sub_type;
 743};
 744
 745/* Note: if one xstat name is subset of another, it should be before it in this
 746 * list.
 747 * Name length must be under 64 chars.
 748 */
 749static const struct extended_stats_options_t extended_stats_options[] = {
 750        {"cpu_hits",  IFLA_STATS_LINK_OFFLOAD_XSTATS, IFLA_OFFLOAD_XSTATS_CPU_HIT},
 751};
 752
 753static const char *get_filter_type(const char *name)
 754{
 755        int name_len;
 756        int i;
 757
 758        name_len = strlen(name);
 759        for (i = 0; i < ARRAY_SIZE(extended_stats_options); i++) {
 760                const struct extended_stats_options_t *xstat;
 761
 762                xstat = &extended_stats_options[i];
 763                if (strncmp(name, xstat->name, name_len) == 0) {
 764                        filter_type = xstat->id;
 765                        sub_type = xstat->sub_type;
 766                        return xstat->name;
 767                }
 768        }
 769
 770        fprintf(stderr, "invalid ifstat extension %s\n", name);
 771        xstat_usage();
 772        return NULL;
 773}
 774
 775static void usage(void) __attribute__((noreturn));
 776
 777static void usage(void)
 778{
 779        fprintf(stderr,
 780"Usage: ifstat [OPTION] [ PATTERN [ PATTERN ] ]\n"
 781"   -h, --help           this message\n"
 782"   -a, --ignore         ignore history\n"
 783"   -d, --scan=SECS      sample every statistics every SECS\n"
 784"   -e, --errors         show errors\n"
 785"   -j, --json           format output in JSON\n"
 786"   -n, --nooutput       do history only\n"
 787"   -p, --pretty         pretty print\n"
 788"   -r, --reset          reset history\n"
 789"   -s, --noupdate       don't update history\n"
 790"   -t, --interval=SECS  report average over the last SECS\n"
 791"   -V, --version        output version information\n"
 792"   -z, --zeros          show entries with zero activity\n"
 793"   -x, --extended=TYPE  show extended stats of TYPE\n");
 794
 795        exit(-1);
 796}
 797
 798static const struct option longopts[] = {
 799        { "help", 0, 0, 'h' },
 800        { "ignore",  0,  0, 'a' },
 801        { "scan", 1, 0, 'd'},
 802        { "errors", 0, 0, 'e' },
 803        { "nooutput", 0, 0, 'n' },
 804        { "json", 0, 0, 'j' },
 805        { "reset", 0, 0, 'r' },
 806        { "pretty", 0, 0, 'p' },
 807        { "noupdate", 0, 0, 's' },
 808        { "interval", 1, 0, 't' },
 809        { "version", 0, 0, 'V' },
 810        { "zeros", 0, 0, 'z' },
 811        { "extended", 1, 0, 'x'},
 812        { 0 }
 813};
 814
 815int main(int argc, char *argv[])
 816{
 817        char hist_name[128];
 818        struct sockaddr_un sun;
 819        FILE *hist_fp = NULL;
 820        const char *stats_type = NULL;
 821        int ch;
 822        int fd;
 823
 824        is_extended = false;
 825        while ((ch = getopt_long(argc, argv, "hjpvVzrnasd:t:ex:",
 826                        longopts, NULL)) != EOF) {
 827                switch (ch) {
 828                case 'z':
 829                        dump_zeros = 1;
 830                        break;
 831                case 'r':
 832                        reset_history = 1;
 833                        break;
 834                case 'a':
 835                        ignore_history = 1;
 836                        break;
 837                case 's':
 838                        no_update = 1;
 839                        break;
 840                case 'n':
 841                        no_output = 1;
 842                        break;
 843                case 'e':
 844                        show_errors = 1;
 845                        break;
 846                case 'j':
 847                        json_output = 1;
 848                        break;
 849                case 'p':
 850                        pretty = 1;
 851                        break;
 852                case 'd':
 853                        scan_interval = atoi(optarg) * 1000;
 854                        if (scan_interval <= 0) {
 855                                fprintf(stderr, "ifstat: invalid scan interval\n");
 856                                exit(-1);
 857                        }
 858                        break;
 859                case 't':
 860                        time_constant = atoi(optarg);
 861                        if (time_constant <= 0) {
 862                                fprintf(stderr, "ifstat: invalid time constant divisor\n");
 863                                exit(-1);
 864                        }
 865                        break;
 866                case 'x':
 867                        stats_type = optarg;
 868                        is_extended = true;
 869                        break;
 870                case 'v':
 871                case 'V':
 872                        printf("ifstat utility, iproute2-%s\n", version);
 873                        exit(0);
 874                case 'h':
 875                case '?':
 876                default:
 877                        usage();
 878                }
 879        }
 880
 881        argc -= optind;
 882        argv += optind;
 883
 884        if (stats_type) {
 885                stats_type = get_filter_type(stats_type);
 886                if (!stats_type)
 887                        exit(-1);
 888        }
 889
 890        sun.sun_family = AF_UNIX;
 891        sun.sun_path[0] = 0;
 892        sprintf(sun.sun_path+1, "ifstat%d", getuid());
 893
 894        if (scan_interval > 0) {
 895                if (time_constant == 0)
 896                        time_constant = 60;
 897                time_constant *= 1000;
 898                W = 1 - 1/exp(log(10)*(double)scan_interval/time_constant);
 899                if ((fd = socket(AF_UNIX, SOCK_STREAM, 0)) < 0) {
 900                        perror("ifstat: socket");
 901                        exit(-1);
 902                }
 903                if (bind(fd, (struct sockaddr *)&sun, 2+1+strlen(sun.sun_path+1)) < 0) {
 904                        perror("ifstat: bind");
 905                        exit(-1);
 906                }
 907                if (listen(fd, 5) < 0) {
 908                        perror("ifstat: listen");
 909                        exit(-1);
 910                }
 911                if (daemon(0, 0)) {
 912                        perror("ifstat: daemon");
 913                        exit(-1);
 914                }
 915                signal(SIGPIPE, SIG_IGN);
 916                signal(SIGCHLD, sigchild);
 917                server_loop(fd);
 918                exit(0);
 919        }
 920
 921        patterns = argv;
 922        npatterns = argc;
 923
 924        if (getenv("IFSTAT_HISTORY"))
 925                snprintf(hist_name, sizeof(hist_name),
 926                         "%s", getenv("IFSTAT_HISTORY"));
 927        else
 928                if (!stats_type)
 929                        snprintf(hist_name, sizeof(hist_name),
 930                                 "%s/.ifstat.u%d", P_tmpdir, getuid());
 931                else
 932                        snprintf(hist_name, sizeof(hist_name),
 933                                 "%s/.%s_ifstat.u%d", P_tmpdir, stats_type,
 934                                 getuid());
 935
 936        if (reset_history)
 937                unlink(hist_name);
 938
 939        if (!ignore_history || !no_update) {
 940                struct stat stb;
 941
 942                fd = open(hist_name, O_RDWR|O_CREAT|O_NOFOLLOW, 0600);
 943                if (fd < 0) {
 944                        perror("ifstat: open history file");
 945                        exit(-1);
 946                }
 947                if ((hist_fp = fdopen(fd, "r+")) == NULL) {
 948                        perror("ifstat: fdopen history file");
 949                        exit(-1);
 950                }
 951                if (flock(fileno(hist_fp), LOCK_EX)) {
 952                        perror("ifstat: flock history file");
 953                        exit(-1);
 954                }
 955                if (fstat(fileno(hist_fp), &stb) != 0) {
 956                        perror("ifstat: fstat history file");
 957                        exit(-1);
 958                }
 959                if (stb.st_nlink != 1 || stb.st_uid != getuid()) {
 960                        fprintf(stderr, "ifstat: something is so wrong with history file, that I prefer not to proceed.\n");
 961                        exit(-1);
 962                }
 963                if (!ignore_history) {
 964                        FILE *tfp;
 965                        long uptime = -1;
 966
 967                        if ((tfp = fopen("/proc/uptime", "r")) != NULL) {
 968                                if (fscanf(tfp, "%ld", &uptime) != 1)
 969                                        uptime = -1;
 970                                fclose(tfp);
 971                        }
 972                        if (uptime >= 0 && time(NULL) >= stb.st_mtime+uptime) {
 973                                fprintf(stderr, "ifstat: history is aged out, resetting\n");
 974                                if (ftruncate(fileno(hist_fp), 0))
 975                                        perror("ifstat: ftruncate");
 976                        }
 977                }
 978
 979                load_raw_table(hist_fp);
 980
 981                hist_db = kern_db;
 982                kern_db = NULL;
 983        }
 984
 985        if ((fd = socket(AF_UNIX, SOCK_STREAM, 0)) >= 0 &&
 986            (connect(fd, (struct sockaddr *)&sun, 2+1+strlen(sun.sun_path+1)) == 0
 987             || (strcpy(sun.sun_path+1, "ifstat0"),
 988                 connect(fd, (struct sockaddr *)&sun, 2+1+strlen(sun.sun_path+1)) == 0))
 989            && verify_forging(fd) == 0) {
 990                FILE *sfp = fdopen(fd, "r");
 991
 992                if (!sfp) {
 993                        fprintf(stderr, "ifstat: fdopen failed: %s\n",
 994                                strerror(errno));
 995                        close(fd);
 996                } else  {
 997                        load_raw_table(sfp);
 998                        if (hist_db && source_mismatch) {
 999                                fprintf(stderr, "ifstat: history is stale, ignoring it.\n");
1000                                hist_db = NULL;
1001                        }
1002                        fclose(sfp);
1003                }
1004        } else {
1005                if (fd >= 0)
1006                        close(fd);
1007                if (hist_db && info_source[0] && strcmp(info_source, "kernel")) {
1008                        fprintf(stderr, "ifstat: history is stale, ignoring it.\n");
1009                        hist_db = NULL;
1010                        info_source[0] = 0;
1011                }
1012                load_info();
1013                if (info_source[0] == 0)
1014                        strcpy(info_source, "kernel");
1015        }
1016
1017        if (!no_output) {
1018                if (ignore_history || hist_db == NULL)
1019                        dump_kern_db(stdout);
1020                else
1021                        dump_incr_db(stdout);
1022        }
1023
1024        if (!no_update) {
1025                if (ftruncate(fileno(hist_fp), 0))
1026                        perror("ifstat: ftruncate");
1027                rewind(hist_fp);
1028
1029                json_output = 0;
1030                dump_raw_db(hist_fp, 1);
1031                fclose(hist_fp);
1032        }
1033        exit(0);
1034}
1035