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