usr.bin/netstat/main.c

   1 /*
   2  * Copyright (c) 1983, 1988, 1993
   3  *      Regents of the University of California.  All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 3. All advertising materials mentioning features or use of this software
  14  *    must display the following acknowledgement:
  15  *      This product includes software developed by the University of
  16  *      California, Berkeley and its contributors.
  17  * 4. Neither the name of the University nor the names of its contributors
  18  *    may be used to endorse or promote products derived from this software
  19  *    without specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  31  * SUCH DAMAGE.
  32  *
  33  * @(#) Copyright (c) 1983, 1988, 1993 Regents of the University of California.  All rights reserved.
  34  * @(#)main.c   8.4 (Berkeley) 3/1/94
  35  * $FreeBSD: src/usr.bin/netstat/main.c,v 1.34.2.12 2001/09/17 15:17:46 ru Exp $
  36  * $DragonFly: src/usr.bin/netstat/main.c,v 1.16 2008/07/11 23:09:18 thomas Exp $
  37  */
  38
  39 #include <sys/param.h>
  40 #include <sys/file.h>
  41 #include <sys/protosw.h>
  42 #include <sys/socket.h>
  43
  44 #include <netinet/in.h>
  45
  46 #include <netgraph/socket/ng_socket.h>
  47
  48 #include <ctype.h>
  49 #include <err.h>
  50 #include <errno.h>
  51 #include <kvm.h>
  52 #include <limits.h>
  53 #include <netdb.h>
  54 #include <nlist.h>
  55 #include <paths.h>
  56 #include <stdio.h>
  57 #include <stdlib.h>
  58 #include <string.h>
  59 #include <unistd.h>
  60 #include "netstat.h"
  61
  62 static struct nlist nl[] = {
  63 #define N_IFNET         0
  64         { .n_name = "_ifnet" },
  65 #define N_IMP           1
  66         { .n_name = "_imp_softc" },
  67 #define N_RTSTAT        2
  68         { .n_name = "_rtstat" },
  69 #define N_UNIXSW        3
  70         { .n_name = "_localsw" },
  71 #define N_IDP           4
  72         { .n_name = "_nspcb"},
  73 #define N_IDPSTAT       5
  74         { .n_name = "_idpstat"},
  75 #define N_SPPSTAT       6
  76         { .n_name = "_spp_istat"},
  77 #define N_NSERR         7
  78         { .n_name = "_ns_errstat"},
  79 #define N_CLNPSTAT      8
  80         { .n_name = "_clnp_stat"},
  81 #define IN_NOTUSED      9
  82         { .n_name = "_tp_inpcb" },
  83 #define ISO_TP          10
  84         { .n_name = "_tp_refinfo" },
  85 #define N_TPSTAT        11
  86         { .n_name = "_tp_stat" },
  87 #define N_ESISSTAT      12
  88         { .n_name = "_esis_stat"},
  89 #define N_NIMP          13
  90         { .n_name = "_nimp"},
  91 #define N_RTREE         14
  92         { .n_name = "_rt_tables"},
  93 #define N_CLTP          15
  94         { .n_name = "_cltb"},
  95 #define N_CLTPSTAT      16
  96         { .n_name = "_cltpstat"},
  97 #define N_NFILE         17
  98         { .n_name = "_nfile" },
  99 #define N_FILE          18
 100         { .n_name = "_file" },
 101 #define N_MRTSTAT       19
 102         { .n_name = "_mrtstat" },
 103 #define N_MFCTABLE      20
 104         { .n_name = "_mfctable" },
 105 #define N_VIFTABLE      21
 106         { .n_name = "_viftable" },
 107 #define N_IPX           22
 108         { .n_name = "_ipxpcb"},
 109 #define N_IPXSTAT       23
 110         { .n_name = "_ipxstat"},
 111 #define N_SPXSTAT       24
 112         { .n_name = "_spx_istat"},
 113 #define N_DDPSTAT       25
 114         { .n_name = "_ddpstat"},
 115 #define N_DDPCB         26
 116         { .n_name = "_ddpcb"},
 117 #define N_NGSOCKS       27
 118         { .n_name = "_ngsocklist"},
 119 #define N_IP6STAT       28
 120         { .n_name = "_ip6stat" },
 121 #define N_ICMP6STAT     29
 122         { .n_name = "_icmp6stat" },
 123 #define N_IPSECSTAT     30
 124         { .n_name = "_ipsecstat" },
 125 #define N_IPSEC6STAT    31
 126         { .n_name = "_ipsec6stat" },
 127 #define N_PIM6STAT      32
 128         { .n_name = "_pim6stat" },
 129 #define N_MRT6PROTO     33
 130         { .n_name = "_ip6_mrtproto" },
 131 #define N_MRT6STAT      34
 132         { .n_name = "_mrt6stat" },
 133 #define N_MF6CTABLE     35
 134         { .n_name = "_mf6ctable" },
 135 #define N_MIF6TABLE     36
 136         { .n_name = "_mif6table" },
 137 #define N_PFKEYSTAT     37
 138         { .n_name = "_pfkeystat" },
 139 #define N_MBSTAT        38
 140         { .n_name = "_mbstat" },
 141 #define N_MBTYPES       39
 142         { .n_name = "_mbtypes" },
 143 #define N_NMBCLUSTERS   40
 144         { .n_name = "_nmbclusters" },
 145 #define N_NMBUFS        41
 146         { .n_name = "_nmbufs" },
 147 #define N_RTTRASH       42
 148         { .n_name = "_rttrash" },
 149 #define N_NCPUS         43
 150         { .n_name = "_ncpus" },
 151 #define N_CARPSTAT      44
 152         { .n_name = "_carpstats" },
 153         { .n_name = NULL },
 154 };
 155
 156 struct protox {
 157         u_char  pr_index;               /* index into nlist of cb head */
 158         u_char  pr_sindex;              /* index into nlist of stat block */
 159         u_char  pr_wanted;              /* 1 if wanted, 0 otherwise */
 160         void    (*pr_cblocks)(u_long, const char *, int);
 161                                         /* control blocks printing routine */
 162         void    (*pr_stats)(u_long, const char *, int);
 163                                         /* statistics printing routine */
 164         void    (*pr_istats)(char *);   /* per/if statistics printing routine */
 165         const char *pr_name;            /* well-known name */
 166         u_int   pr_usesysctl;           /* true if we use sysctl, not kvm */
 167 } protox[] = {
 168         { -1,           -1,             1,      protopr,
 169           tcp_stats,    NULL,           "tcp",  IPPROTO_TCP },
 170         { -1,           -1,             1,      protopr,
 171           udp_stats,    NULL,           "udp",  IPPROTO_UDP },
 172         { -1,           -1,             1,      protopr,
 173           NULL,         NULL,           "divert",IPPROTO_DIVERT },
 174         { -1,           -1,             1,      protopr,
 175           ip_stats,     NULL,           "ip",   IPPROTO_RAW },
 176         { -1,           -1,             1,      protopr,
 177           icmp_stats,   NULL,           "icmp", IPPROTO_ICMP },
 178         { -1,           -1,             1,      protopr,
 179           igmp_stats,   NULL,           "igmp", IPPROTO_IGMP },
 180 #ifdef IPSEC
 181         { -1,           N_IPSECSTAT,    1,      0,
 182           ipsec_stats,  NULL,           "ipsec",        0},
 183 #endif
 184         { -1,           N_CARPSTAT,     1,      0,
 185           carp_stats,   NULL,           "carp",         0},
 186         { -1,           -1,             0,      0,
 187           0,            NULL,           NULL,           0}
 188 };
 189
 190 #ifdef INET6
 191 struct protox ip6protox[] = {
 192         { -1,           -1,             1,      protopr,
 193           tcp_stats,    NULL,           "tcp",  IPPROTO_TCP },
 194         { -1,           -1,             1,      protopr,
 195           udp_stats,    NULL,           "udp",  IPPROTO_UDP },
 196         { -1,           N_IP6STAT,      1,      protopr,
 197           ip6_stats,    ip6_ifstats,    "ip6",  IPPROTO_RAW },
 198         { -1,           N_ICMP6STAT,    1,      protopr,
 199           icmp6_stats,  icmp6_ifstats,  "icmp6",IPPROTO_ICMPV6 },
 200 #ifdef IPSEC
 201         { -1,           N_IPSEC6STAT,   1,      0,
 202           ipsec_stats,  NULL,           "ipsec6",0 },
 203 #endif
 204 #ifdef notyet
 205         { -1,           N_PIM6STAT,     1,      0,
 206           pim6_stats,   NULL,           "pim6", 0 },
 207 #endif
 208         { -1,           -1,             1,      0,
 209           rip6_stats,   NULL,           "rip6", 0 },
 210         { -1,           -1,             1,      protopr,
 211           pim_stats,    NULL,           "pim",  IPPROTO_PIM },
 212         { -1,           -1,             0,      0,
 213           0,            NULL,           0,      0 }
 214 };
 215 #endif /*INET6*/
 216
 217 #ifdef IPSEC
 218 struct protox pfkeyprotox[] = {
 219         { -1,           N_PFKEYSTAT,    1,      0,
 220           pfkey_stats,  NULL,           "pfkey", 0 },
 221         { -1,           -1,             0,      0,
 222           0,            NULL,           0,      0 }
 223 };
 224 #endif
 225
 226 struct protox atalkprotox[] = {
 227         { N_DDPCB,      N_DDPSTAT,      1,      atalkprotopr,
 228           ddp_stats,    NULL,           "ddp",  0 },
 229         { -1,           -1,             0,      0,
 230           0,            NULL,           NULL,   0 }
 231 };
 232
 233 struct protox netgraphprotox[] = {
 234         { N_NGSOCKS,    -1,             1,      netgraphprotopr,
 235           NULL,         NULL,           "ctrl", 0 },
 236         { N_NGSOCKS,    -1,             1,      netgraphprotopr,
 237           NULL,         NULL,           "data", 0 },
 238         { -1,           -1,             0,      0,
 239           0,            NULL,           NULL,   0 }
 240 };
 241
 242 struct protox ipxprotox[] = {
 243         { N_IPX,        N_IPXSTAT,      1,      ipxprotopr,
 244           ipx_stats,    NULL,           "ipx",  0 },
 245         { N_IPX,        N_SPXSTAT,      1,      ipxprotopr,
 246           spx_stats,    NULL,           "spx",  0 },
 247         { -1,           -1,             0,      0,
 248           0,            NULL,           0,      0 }
 249 };
 250
 251 #ifdef NS
 252 struct protox nsprotox[] = {
 253         { N_IDP,        N_IDPSTAT,      1,      nsprotopr,
 254           idp_stats,    NULL,           "idp" },
 255         { N_IDP,        N_SPPSTAT,      1,      nsprotopr,
 256           spp_stats,    NULL,           "spp" },
 257         { -1,           N_NSERR,        1,      0,
 258           nserr_stats,  NULL,           "ns_err" },
 259         { -1,           -1,             0,      0,
 260           0,            NULL,           0 }
 261 };
 262 #endif
 263
 264 #ifdef ISO
 265 struct protox isoprotox[] = {
 266         { ISO_TP,       N_TPSTAT,       1,      iso_protopr,
 267           tp_stats,     NULL,           "tp" },
 268         { N_CLTP,       N_CLTPSTAT,     1,      iso_protopr,
 269           cltp_stats,   NULL,           "cltp" },
 270         { -1,           N_CLNPSTAT,     1,       0,
 271           clnp_stats,   NULL,           "clnp"},
 272         { -1,           N_ESISSTAT,     1,       0,
 273           esis_stats,   NULL,           "esis"},
 274         { -1,           -1,             0,      0,
 275           0,            NULL,           0 }
 276 };
 277 #endif
 278
 279 struct protox *protoprotox[] = {
 280                                          protox,
 281 #ifdef INET6
 282                                          ip6protox,
 283 #endif
 284 #ifdef IPSEC
 285                                          pfkeyprotox,
 286 #endif
 287                                          ipxprotox, atalkprotox,
 288 #ifdef NS
 289                                          nsprotox,
 290 #endif
 291 #ifdef ISO
 292                                          isoprotox,
 293 #endif
 294                                          NULL };
 295
 296 static void printproto (struct protox *, const char *);
 297 static void usage (void);
 298 static struct protox *name2protox (char *);
 299 static struct protox *knownname (char *);
 300
 301 static kvm_t *kvmd;
 302 static char *nlistf = NULL, *memf = NULL;
 303
 304 int     Aflag;          /* show addresses of protocol control block */
 305 int     aflag;          /* show all sockets (including servers) */
 306 int     bflag;          /* show i/f total bytes in/out */
 307 int     cpuflag = -1;   /* dump route table from specific cpu */
 308 int     dflag;          /* show i/f dropped packets */
 309 int     gflag;          /* show group (multicast) routing or stats */
 310 int     iflag;          /* show interfaces */
 311 int     Lflag;          /* show size of listen queues */
 312 int     mflag;          /* show memory stats */
 313 int     Pflag;          /* show more protocol info (go past 80 columns) */
 314 int     numeric_addr;   /* show addresses numerically */
 315 int     numeric_port;   /* show ports numerically */
 316 static int pflag;       /* show given protocol */
 317 int     rflag;          /* show routing tables (or routing stats) */
 318 int     sflag;          /* show protocol statistics */
 319 int     tflag;          /* show i/f watchdog timers */
 320 int     Bflag;          /* show buffer limit instead of buffer use */
 321 int     Wflag;          /* wide display */
 322 int     zflag;          /* zero stats */
 323
 324 int     interval;       /* repeat interval for i/f stats */
 325
 326 char    *interface;     /* desired i/f for stats, or NULL for all i/fs */
 327 int     unit;           /* unit number for above */
 328
 329 int     af;             /* address family */
 330
 331 int
 332 main(int argc, char **argv)
 333 {
 334         struct protox *tp = NULL;  /* for printing cblocks & stats */
 335         int ch;
 336         int n;
 337
 338         af = AF_UNSPEC;
 339
 340         while ((ch = getopt(argc, argv, "Aabc:df:gI:iLlM:mN:nPp:rSsBtuWw:z")) != -1)
 341                 switch(ch) {
 342                 case 'A':
 343                         Aflag = 1;
 344                         break;
 345                 case 'a':
 346                         aflag = 1;
 347                         break;
 348                 case 'b':
 349                         bflag = 1;
 350                         break;
 351                 case 'c':
 352                         kread(0, 0, 0);
 353                         kread(nl[N_NCPUS].n_value, (char *)&n, sizeof(n));
 354                         cpuflag = strtol(optarg, NULL, 0);
 355                         if (cpuflag < 0 || cpuflag >= n)
 356                             errx(1, "cpu %d does not exist", cpuflag);
 357                         break;
 358                 case 'd':
 359                         dflag = 1;
 360                         break;
 361                 case 'f':
 362 #ifdef NS
 363                         if (strcmp(optarg, "ns") == 0)
 364                                 af = AF_NS;
 365                         else
 366 #endif
 367                         if (strcmp(optarg, "ipx") == 0)
 368                                 af = AF_IPX;
 369                         else if (strcmp(optarg, "inet") == 0)
 370                                 af = AF_INET;
 371 #ifdef INET6
 372                         else if (strcmp(optarg, "inet6") == 0)
 373                                 af = AF_INET6;
 374 #endif /*INET6*/
 375 #ifdef INET6
 376                         else if (strcmp(optarg, "pfkey") == 0)
 377                                 af = PF_KEY;
 378 #endif /*INET6*/
 379                         else if (strcmp(optarg, "unix") == 0)
 380                                 af = AF_UNIX;
 381                         else if (strcmp(optarg, "atalk") == 0)
 382                                 af = AF_APPLETALK;
 383                         else if (strcmp(optarg, "ng") == 0
 384                             || strcmp(optarg, "netgraph") == 0)
 385                                 af = AF_NETGRAPH;
 386 #ifdef ISO
 387                         else if (strcmp(optarg, "iso") == 0)
 388                                 af = AF_ISO;
 389 #endif
 390                         else if (strcmp(optarg, "link") == 0)
 391                                 af = AF_LINK;
 392                         else if (strcmp(optarg, "mpls") == 0)
 393                                 af = AF_MPLS;
 394                         else {
 395                                 errx(1, "%s: unknown address family", optarg);
 396                         }
 397                         break;
 398                 case 'g':
 399                         gflag = 1;
 400                         break;
 401                 case 'I': {
 402                         char *cp;
 403
 404                         iflag = 1;
 405                         for (cp = interface = optarg; isalpha(*cp); cp++)
 406                                 continue;
 407                         unit = atoi(cp);
 408                         break;
 409                 }
 410                 case 'i':
 411                         iflag = 1;
 412                         break;
 413                 case 'L':
 414                         Lflag = 1;
 415                         break;
 416                 case 'M':
 417                         memf = optarg;
 418                         break;
 419                 case 'm':
 420                         mflag = 1;
 421                         break;
 422                 case 'N':
 423                         nlistf = optarg;
 424                         break;
 425                 case 'n':
 426                         numeric_addr = numeric_port = 1;
 427                         break;
 428                 case 'P':
 429                         Pflag = 1;
 430                         break;
 431                 case 'p':
 432                         if ((tp = name2protox(optarg)) == NULL) {
 433                                 errx(1,
 434                                      "%s: unknown or uninstrumented protocol",
 435                                      optarg);
 436                         }
 437                         pflag = 1;
 438                         break;
 439                 case 'r':
 440                         rflag = 1;
 441                         break;
 442                 case 's':
 443                         ++sflag;
 444                         break;
 445                 case 'S':
 446                         numeric_addr = 1;
 447                         break;
 448                 case 'B':
 449                         Bflag = 1;
 450                         break;
 451                 case 't':
 452                         tflag = 1;
 453                         break;
 454                 case 'u':
 455                         af = AF_UNIX;
 456                         break;
 457                 case 'W':
 458                 case 'l':
 459                         Wflag = 1;
 460                         break;
 461                 case 'w':
 462                         interval = atoi(optarg);
 463                         iflag = 1;
 464                         break;
 465                 case 'z':
 466                         zflag = 1;
 467                         break;
 468                 case '?':
 469                 default:
 470                         usage();
 471                 }
 472         argv += optind;
 473         argc -= optind;
 474
 475 #define BACKWARD_COMPATIBILITY
 476 #ifdef  BACKWARD_COMPATIBILITY
 477         if (*argv) {
 478                 if (isdigit(**argv)) {
 479                         interval = atoi(*argv);
 480                         if (interval <= 0)
 481                                 usage();
 482                         ++argv;
 483                         iflag = 1;
 484                 }
 485                 if (*argv) {
 486                         nlistf = *argv;
 487                         if (*++argv)
 488                                 memf = *argv;
 489                 }
 490         }
 491 #endif
 492
 493         /*
 494          * Discard setgid privileges if not the running kernel so that bad
 495          * guys can't print interesting stuff from kernel memory.
 496          */
 497         if (nlistf != NULL || memf != NULL)
 498                 setgid(getgid());
 499
 500         if (mflag) {
 501                 if (memf != NULL) {
 502                         if (kread(0, 0, 0) == 0)
 503                                 mbpr(nl[N_MBSTAT].n_value,
 504                                     nl[N_MBTYPES].n_value,
 505                                     nl[N_NMBCLUSTERS].n_value,
 506                                     nl[N_NMBUFS].n_value);
 507                 } else
 508                         mbpr(0, 0, 0, 0);
 509                 exit(0);
 510         }
 511 #if 0
 512         /*
 513          * Keep file descriptors open to avoid overhead
 514          * of open/close on each call to get* routines.
 515          */
 516         sethostent(1);
 517         setnetent(1);
 518 #else
 519         /*
 520          * This does not make sense any more with DNS being default over
 521          * the files.  Doing a setXXXXent(1) causes a tcp connection to be
 522          * used for the queries, which is slower.
 523          */
 524 #endif
 525         if (iflag && !sflag) {
 526                 kread(0, 0, 0);
 527                 intpr(interval, nl[N_IFNET].n_value, NULL);
 528                 exit(0);
 529         }
 530         if (rflag) {
 531                 kread(0, 0, 0);
 532                 if (sflag)
 533                         rt_stats();
 534                 else
 535                         routepr(nl[N_RTREE].n_value);
 536                 exit(0);
 537         }
 538         if (gflag) {
 539                 kread(0, 0, 0);
 540                 if (sflag) {
 541                         if (af == AF_INET || af == AF_UNSPEC)
 542                                 mrt_stats(nl[N_MRTSTAT].n_value);
 543 #ifdef INET6
 544                         if (af == AF_INET6 || af == AF_UNSPEC)
 545                                 mrt6_stats(nl[N_MRT6STAT].n_value);
 546 #endif
 547                 } else {
 548                         if (af == AF_INET || af == AF_UNSPEC)
 549                                 mroutepr(nl[N_MFCTABLE].n_value,
 550                                          nl[N_VIFTABLE].n_value);
 551 #ifdef INET6
 552                         if (af == AF_INET6 || af == AF_UNSPEC)
 553                                 mroute6pr(nl[N_MF6CTABLE].n_value,
 554                                           nl[N_MIF6TABLE].n_value);
 555 #endif
 556                 }
 557                 exit(0);
 558         }
 559
 560         kread(0, 0, 0);
 561         if (tp) {
 562                 printproto(tp, tp->pr_name);
 563                 exit(0);
 564         }
 565         if (af == AF_INET || af == AF_UNSPEC)
 566                 for (tp = protox; tp->pr_name; tp++)
 567                         printproto(tp, tp->pr_name);
 568 #ifdef INET6
 569         if (af == AF_INET6 || af == AF_UNSPEC)
 570                 for (tp = ip6protox; tp->pr_name; tp++)
 571                         printproto(tp, tp->pr_name);
 572 #endif /*INET6*/
 573 #ifdef IPSEC
 574         if (af == PF_KEY || af == AF_UNSPEC)
 575                 for (tp = pfkeyprotox; tp->pr_name; tp++)
 576                         printproto(tp, tp->pr_name);
 577 #endif /*IPSEC*/
 578         if (af == AF_IPX || af == AF_UNSPEC) {
 579                 kread(0, 0, 0);
 580                 for (tp = ipxprotox; tp->pr_name; tp++)
 581                         printproto(tp, tp->pr_name);
 582         }
 583         if (af == AF_APPLETALK || af == AF_UNSPEC)
 584                 for (tp = atalkprotox; tp->pr_name; tp++)
 585                         printproto(tp, tp->pr_name);
 586         if (af == AF_NETGRAPH || af == AF_UNSPEC)
 587                 for (tp = netgraphprotox; tp->pr_name; tp++)
 588                         printproto(tp, tp->pr_name);
 589 #ifdef NS
 590         if (af == AF_NS || af == AF_UNSPEC)
 591                 for (tp = nsprotox; tp->pr_name; tp++)
 592                         printproto(tp, tp->pr_name);
 593 #endif
 594 #ifdef ISO
 595         if (af == AF_ISO || af == AF_UNSPEC)
 596                 for (tp = isoprotox; tp->pr_name; tp++)
 597                         printproto(tp, tp->pr_name);
 598 #endif
 599         if ((af == AF_UNIX || af == AF_UNSPEC) && !Lflag && !sflag)
 600                 unixpr();
 601         exit(0);
 602 }
 603
 604 /*
 605  * Print out protocol statistics or control blocks (per sflag).
 606  * If the interface was not specifically requested, and the symbol
 607  * is not in the namelist, ignore this one.
 608  */
 609 static void
 610 printproto(struct protox *tp, const char *name)
 611 {
 612         void (*pr)(u_long, const char *, int);
 613         u_long off;
 614
 615         if (sflag) {
 616                 if (iflag) {
 617                         if (tp->pr_istats)
 618                                 intpr(interval, nl[N_IFNET].n_value,
 619                                       tp->pr_istats);
 620                         else if (pflag)
 621                                 printf("%s: no per-interface stats routine\n",
 622                                     tp->pr_name);
 623                         return;
 624                 }
 625                 else {
 626                         pr = tp->pr_stats;
 627                         if (!pr) {
 628                                 if (pflag)
 629                                         printf("%s: no stats routine\n",
 630                                             tp->pr_name);
 631                                 return;
 632                         }
 633                         off = tp->pr_usesysctl ? tp->pr_usesysctl
 634                                 : nl[tp->pr_sindex].n_value;
 635                 }
 636         } else {
 637                 pr = tp->pr_cblocks;
 638                 if (!pr) {
 639                         if (pflag)
 640                                 printf("%s: no PCB routine\n", tp->pr_name);
 641                         return;
 642                 }
 643                 off = tp->pr_usesysctl ? tp->pr_usesysctl
 644                         : nl[tp->pr_index].n_value;
 645         }
 646         if (pr != NULL && (off || af != AF_UNSPEC))
 647                 (*pr)(off, name, af);
 648 }
 649
 650 /*
 651  * Read kernel memory, return 0 on success.
 652  */
 653 int
 654 kread(u_long addr, char *buf, int size)
 655 {
 656         if (kvmd == 0) {
 657                 /*
 658                  * XXX.
 659                  */
 660                 kvmd = kvm_openfiles(nlistf, memf, NULL, O_RDONLY, buf);
 661                 if (kvmd != NULL) {
 662                         if (kvm_nlist(kvmd, nl) < 0) {
 663                                 if(nlistf)
 664                                         errx(1, "%s: kvm_nlist: %s", nlistf,
 665                                              kvm_geterr(kvmd));
 666                                 else
 667                                         errx(1, "kvm_nlist: %s", kvm_geterr(kvmd));
 668                         }
 669
 670                         if (nl[0].n_type == 0) {
 671                                 if(nlistf)
 672                                         errx(1, "%s: no namelist", nlistf);
 673                                 else
 674                                         errx(1, "no namelist");
 675                         }
 676                 } else {
 677                         warnx("kvm not available");
 678                         return(-1);
 679                 }
 680         }
 681         if (!buf)
 682                 return (0);
 683         if (kvm_read(kvmd, addr, buf, size) != size) {
 684                 warnx("%s", kvm_geterr(kvmd));
 685                 return (-1);
 686         }
 687         return (0);
 688 }
 689
 690 const char *
 691 plural(int n)
 692 {
 693         return (n != 1 ? "s" : "");
 694 }
 695
 696 const char *
 697 plurales(int n)
 698 {
 699         return (n != 1 ? "es" : "");
 700 }
 701
 702 /*
 703  * Find the protox for the given "well-known" name.
 704  */
 705 static struct protox *
 706 knownname(char *name)
 707 {
 708         struct protox **tpp, *tp;
 709
 710         for (tpp = protoprotox; *tpp; tpp++)
 711                 for (tp = *tpp; tp->pr_name; tp++)
 712                         if (strcmp(tp->pr_name, name) == 0)
 713                                 return (tp);
 714         return (NULL);
 715 }
 716
 717 /*
 718  * Find the protox corresponding to name.
 719  */
 720 static struct protox *
 721 name2protox(char *name)
 722 {
 723         struct protox *tp;
 724         char **alias;                   /* alias from p->aliases */
 725         struct protoent *p;
 726
 727         /*
 728          * Try to find the name in the list of "well-known" names. If that
 729          * fails, check if name is an alias for an Internet protocol.
 730          */
 731         if ((tp = knownname(name)) != NULL)
 732                 return (tp);
 733
 734         setprotoent(1);                 /* make protocol lookup cheaper */
 735         while ((p = getprotoent()) != NULL) {
 736                 /* assert: name not same as p->name */
 737                 for (alias = p->p_aliases; *alias; alias++)
 738                         if (strcmp(name, *alias) == 0) {
 739                                 endprotoent();
 740                                 return (knownname(p->p_name));
 741                         }
 742         }
 743         endprotoent();
 744         return (NULL);
 745 }
 746
 747 static void
 748 usage(void)
 749 {
 750         (void)fprintf(stderr, "%s\n%s\n%s\n%s\n%s\n%s\n%s\n%s\n%s\n%s\n",
 751 "usage: netstat [-AaLnPSW] [-c cpu] [-f protocol_family | -p protocol]\n"
 752 "               [-M core] [-N system]",
 753 "       netstat -i | -I interface [-aBbdnt] [-f address_family]\n"
 754 "               [-M core] [-N system]",
 755 "       netstat -w wait [-I interface] [-d] [-M core] [-N system]",
 756 "       netstat -s [-s] [-z] [-f protocol_family | -p protocol] [-M core]",
 757 "       netstat -i | -I interface -s [-f protocol_family | -p protocol]\n"
 758 "               [-M core] [-N system]",
 759 "       netstat -m [-M core] [-N system]",
 760 "       netstat -r [-AanW] [-f address_family] [-M core] [-N system]",
 761 "       netstat -rs [-s] [-M core] [-N system]",
 762 "       netstat -g [-W] [-f address_family] [-M core] [-N system]",
 763 "       netstat -gs [-s] [-f address_family] [-M core] [-N system]");
 764         exit(1);
 765 }