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