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