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