main.c revision 78314
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 35char 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 42static char sccsid[] = "@(#)main.c 8.4 (Berkeley) 3/1/94"; 43#endif 44static const char rcsid[] = 45 "$FreeBSD: head/usr.bin/netstat/main.c 78314 2001-06-15 23:35:13Z assar $"; 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 71static 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#define N_MBSTAT 38 149 { "_mbstat" }, 150#define N_MBTYPES 39 151 { "_mbtypes" }, 152#define N_NMBCLUSTERS 40 153 { "_nmbclusters" }, 154#define N_NMBUFS 41 155 { "_nmbufs" }, 156 { "" }, 157}; 158 159struct protox { 160 u_char pr_index; /* index into nlist of cb head */ 161 u_char pr_sindex; /* index into nlist of stat block */ 162 u_char pr_wanted; /* 1 if wanted, 0 otherwise */ 163 void (*pr_cblocks)(u_long, char *, int); 164 /* control blocks printing routine */ 165 void (*pr_stats)(u_long, char *, int); 166 /* statistics printing routine */ 167 void (*pr_istats)(char *); /* per/if statistics printing routine */ 168 char *pr_name; /* well-known name */ 169 int pr_usesysctl; /* true if we use sysctl, not kvm */ 170} protox[] = { 171 { -1, -1, 1, protopr, 172 tcp_stats, NULL, "tcp", IPPROTO_TCP }, 173 { -1, -1, 1, protopr, 174 udp_stats, NULL, "udp", IPPROTO_UDP }, 175 { -1, -1, 1, protopr, 176 NULL, NULL, "divert",IPPROTO_DIVERT }, 177 { -1, -1, 1, protopr, 178 ip_stats, NULL, "ip", IPPROTO_RAW }, 179 { -1, -1, 1, protopr, 180 icmp_stats, NULL, "icmp", IPPROTO_ICMP }, 181 { -1, -1, 1, protopr, 182 igmp_stats, NULL, "igmp", IPPROTO_IGMP }, 183#ifdef IPSEC 184 { -1, N_IPSECSTAT, 1, 0, 185 ipsec_stats, NULL, "ipsec", 0}, 186#endif 187 { -1, -1, 1, 0, 188 bdg_stats, NULL, "bdg", 1 /* bridging... */ }, 189 { -1, -1, 0, 0, 190 0, NULL, 0 } 191}; 192 193#ifdef INET6 194struct protox ip6protox[] = { 195 { -1, -1, 1, protopr, 196 tcp_stats, NULL, "tcp", IPPROTO_TCP }, 197 { -1, -1, 1, protopr, 198 udp_stats, NULL, "udp", IPPROTO_UDP }, 199 { -1, N_IP6STAT, 1, 0, 200 ip6_stats, ip6_ifstats, "ip6", 0 }, 201 { -1, N_ICMP6STAT, 1, 0, 202 icmp6_stats, icmp6_ifstats, "icmp6",0 }, 203#ifdef IPSEC 204 { -1, N_IPSEC6STAT, 1, 0, 205 ipsec_stats, NULL, "ipsec6",0 }, 206#endif 207#ifdef notyet 208 { -1, N_PIM6STAT, 1, 0, 209 pim6_stats, NULL, "pim6", 0 }, 210#endif 211 { -1, -1, 1, 0, 212 rip6_stats, NULL, "rip6", 0 }, 213 { -1, -1, 1, 0, 214 bdg_stats, NULL, "bdg", 1 /* bridging... */ }, 215 { -1, -1, 0, 0, 216 0, NULL, 0, 0 } 217}; 218#endif /*INET6*/ 219 220#ifdef IPSEC 221struct protox pfkeyprotox[] = { 222 { -1, N_PFKEYSTAT, 1, 0, 223 pfkey_stats, NULL, "pfkey", 0 }, 224 { -1, -1, 0, 0, 225 0, NULL, 0, 0 } 226}; 227#endif 228 229struct protox atalkprotox[] = { 230 { N_DDPCB, N_DDPSTAT, 1, atalkprotopr, 231 ddp_stats, NULL, "ddp" }, 232 { -1, -1, 0, 0, 233 0, NULL, 0 } 234}; 235 236struct protox netgraphprotox[] = { 237 { N_NGSOCKS, -1, 1, netgraphprotopr, 238 NULL, NULL, "ctrl" }, 239 { N_NGSOCKS, -1, 1, netgraphprotopr, 240 NULL, NULL, "data" }, 241 { -1, NULL, 0, 0, 242 0, NULL, 0 } 243}; 244 245struct protox ipxprotox[] = { 246 { N_IPX, N_IPXSTAT, 1, ipxprotopr, 247 ipx_stats, NULL, "ipx", 0 }, 248 { N_IPX, N_SPXSTAT, 1, ipxprotopr, 249 spx_stats, NULL, "spx", 0 }, 250 { -1, -1, 0, 0, 251 0, NULL, 0, 0 } 252}; 253 254#ifdef NS 255struct protox nsprotox[] = { 256 { N_IDP, N_IDPSTAT, 1, nsprotopr, 257 idp_stats, NULL, "idp" }, 258 { N_IDP, N_SPPSTAT, 1, nsprotopr, 259 spp_stats, NULL, "spp" }, 260 { -1, N_NSERR, 1, 0, 261 nserr_stats, NULL, "ns_err" }, 262 { -1, -1, 0, 0, 263 0, NULL, 0 } 264}; 265#endif 266 267#ifdef ISO 268struct protox isoprotox[] = { 269 { ISO_TP, N_TPSTAT, 1, iso_protopr, 270 tp_stats, NULL, "tp" }, 271 { N_CLTP, N_CLTPSTAT, 1, iso_protopr, 272 cltp_stats, NULL, "cltp" }, 273 { -1, N_CLNPSTAT, 1, 0, 274 clnp_stats, NULL, "clnp"}, 275 { -1, N_ESISSTAT, 1, 0, 276 esis_stats, NULL, "esis"}, 277 { -1, -1, 0, 0, 278 0, NULL, 0 } 279}; 280#endif 281 282struct protox *protoprotox[] = { 283 protox, 284#ifdef INET6 285 ip6protox, 286#endif 287#ifdef IPSEC 288 pfkeyprotox, 289#endif 290 ipxprotox, atalkprotox, 291#ifdef NS 292 nsprotox, 293#endif 294#ifdef ISO 295 isoprotox, 296#endif 297 NULL }; 298 299static void printproto (struct protox *, char *); 300static void usage (void); 301static struct protox *name2protox (char *); 302static struct protox *knownname (char *); 303 304static kvm_t *kvmd; 305static char *nlistf = NULL, *memf = NULL; 306 307int Aflag; /* show addresses of protocol control block */ 308int aflag; /* show all sockets (including servers) */ 309int bflag; /* show i/f total bytes in/out */ 310int dflag; /* show i/f dropped packets */ 311int gflag; /* show group (multicast) routing or stats */ 312int iflag; /* show interfaces */ 313int lflag; /* show routing table with use and ref */ 314int Lflag; /* show size of listen queues */ 315int mflag; /* show memory stats */ 316int numeric_addr; /* show addresses numerically */ 317int numeric_port; /* show ports numerically */ 318static int pflag; /* show given protocol */ 319int rflag; /* show routing tables (or routing stats) */ 320int sflag; /* show protocol statistics */ 321int tflag; /* show i/f watchdog timers */ 322int Wflag; /* wide display */ 323 324int interval; /* repeat interval for i/f stats */ 325 326char *interface; /* desired i/f for stats, or NULL for all i/fs */ 327int unit; /* unit number for above */ 328 329int af; /* address family */ 330 331int 332main(argc, argv) 333 int argc; 334 char *argv[]; 335{ 336 register struct protox *tp = NULL; /* for printing cblocks & stats */ 337 int ch; 338 339 af = AF_UNSPEC; 340 341 while ((ch = getopt(argc, argv, "Aabdf:gI:iLlM:mN:np:rSstuWw:")) != -1) 342 switch(ch) { 343 case 'A': 344 Aflag = 1; 345 break; 346 case 'a': 347 aflag = 1; 348 break; 349 case 'b': 350 bflag = 1; 351 break; 352 case 'd': 353 dflag = 1; 354 break; 355 case 'f': 356#ifdef NS 357 if (strcmp(optarg, "ns") == 0) 358 af = AF_NS; 359 else 360#endif 361 if (strcmp(optarg, "ipx") == 0) 362 af = AF_IPX; 363 else if (strcmp(optarg, "inet") == 0) 364 af = AF_INET; 365#ifdef INET6 366 else if (strcmp(optarg, "inet6") == 0) 367 af = AF_INET6; 368#endif /*INET6*/ 369#ifdef INET6 370 else if (strcmp(optarg, "pfkey") == 0) 371 af = PF_KEY; 372#endif /*INET6*/ 373 else if (strcmp(optarg, "unix") == 0) 374 af = AF_UNIX; 375 else if (strcmp(optarg, "atalk") == 0) 376 af = AF_APPLETALK; 377 else if (strcmp(optarg, "ng") == 0 378 || strcmp(optarg, "netgraph") == 0) 379 af = AF_NETGRAPH; 380#ifdef ISO 381 else if (strcmp(optarg, "iso") == 0) 382 af = AF_ISO; 383#endif 384 else { 385 errx(1, "%s: unknown address family", optarg); 386 } 387 break; 388 case 'g': 389 gflag = 1; 390 break; 391 case 'I': { 392 char *cp; 393 394 iflag = 1; 395 for (cp = interface = optarg; isalpha(*cp); cp++) 396 continue; 397 unit = atoi(cp); 398 break; 399 } 400 case 'i': 401 iflag = 1; 402 break; 403 case 'l': 404 lflag = 1; 405 break; 406 case 'L': 407 Lflag = 1; 408 break; 409 case 'M': 410 memf = optarg; 411 break; 412 case 'm': 413 mflag = 1; 414 break; 415 case 'N': 416 nlistf = optarg; 417 break; 418 case 'n': 419 numeric_addr = numeric_port = 1; 420 break; 421 case 'p': 422 if ((tp = name2protox(optarg)) == NULL) { 423 errx(1, 424 "%s: unknown or uninstrumented protocol", 425 optarg); 426 } 427 pflag = 1; 428 break; 429 case 'r': 430 rflag = 1; 431 break; 432 case 's': 433 ++sflag; 434 break; 435 case 'S': 436 numeric_addr = 1; 437 break; 438 case 't': 439 tflag = 1; 440 break; 441 case 'u': 442 af = AF_UNIX; 443 break; 444 case 'W': 445 Wflag = 1; 446 break; 447 case 'w': 448 interval = atoi(optarg); 449 iflag = 1; 450 break; 451 case '?': 452 default: 453 usage(); 454 } 455 argv += optind; 456 argc -= optind; 457 458#define BACKWARD_COMPATIBILITY 459#ifdef BACKWARD_COMPATIBILITY 460 if (*argv) { 461 if (isdigit(**argv)) { 462 interval = atoi(*argv); 463 if (interval <= 0) 464 usage(); 465 ++argv; 466 iflag = 1; 467 } 468 if (*argv) { 469 nlistf = *argv; 470 if (*++argv) 471 memf = *argv; 472 } 473 } 474#endif 475 476 /* 477 * Discard setgid privileges if not the running kernel so that bad 478 * guys can't print interesting stuff from kernel memory. 479 */ 480 if (nlistf != NULL || memf != NULL) 481 setgid(getgid()); 482 483 if (mflag) { 484 if (memf != NULL) { 485 if (kread(0, 0, 0) == 0) 486 mbpr(nl[N_MBSTAT].n_value, 487 nl[N_MBTYPES].n_value, 488 nl[N_NMBCLUSTERS].n_value, 489 nl[N_NMBUFS].n_value); 490 } else 491 mbpr(0, 0, 0, 0); 492 exit(0); 493 } 494 if (pflag) { 495 if (iflag && tp->pr_istats) { 496 kread(0, 0, 0); 497 intpr(interval, nl[N_IFNET].n_value, tp->pr_istats); 498 exit(0); 499 } 500 if (!tp->pr_stats) { 501 printf("%s: no stats routine\n", tp->pr_name); 502 exit(0); 503 } 504 if (tp->pr_usesysctl) { 505 (*tp->pr_stats)(tp->pr_usesysctl, tp->pr_name); 506 } else { 507 kread(0, 0, 0); 508 (*tp->pr_stats)(nl[tp->pr_sindex].n_value, 509 tp->pr_name); 510 } 511 exit(0); 512 } 513#if 0 514 /* 515 * Keep file descriptors open to avoid overhead 516 * of open/close on each call to get* routines. 517 */ 518 sethostent(1); 519 setnetent(1); 520#else 521 /* 522 * This does not make sense any more with DNS being default over 523 * the files. Doing a setXXXXent(1) causes a tcp connection to be 524 * used for the queries, which is slower. 525 */ 526#endif 527 if (iflag && !sflag) { 528 kread(0, 0, 0); 529 intpr(interval, nl[N_IFNET].n_value, NULL); 530 exit(0); 531 } 532 if (rflag) { 533 kread(0, 0, 0); 534 if (sflag) 535 rt_stats(nl[N_RTSTAT].n_value); 536 else 537 routepr(nl[N_RTREE].n_value); 538 exit(0); 539 } 540 if (gflag) { 541 kread(0, 0, 0); 542 if (sflag) { 543 if (af == AF_INET || af == AF_UNSPEC) 544 mrt_stats(nl[N_MRTSTAT].n_value); 545#ifdef INET6 546 if (af == AF_INET6 || af == AF_UNSPEC) 547 mrt6_stats(nl[N_MRT6STAT].n_value); 548#endif 549 } else { 550 if (af == AF_INET || af == AF_UNSPEC) 551 mroutepr(nl[N_MFCTABLE].n_value, 552 nl[N_VIFTABLE].n_value); 553#ifdef INET6 554 if (af == AF_INET6 || af == AF_UNSPEC) 555 mroute6pr(nl[N_MF6CTABLE].n_value, 556 nl[N_MIF6TABLE].n_value); 557#endif 558 } 559 exit(0); 560 } 561 562 kread(0, 0, 0); 563 if (tp) { 564 printproto(tp, tp->pr_name); 565 exit(0); 566 } 567 if (af == AF_INET || af == AF_UNSPEC) 568 for (tp = protox; tp->pr_name; tp++) 569 printproto(tp, tp->pr_name); 570#ifdef INET6 571 if (af == AF_INET6 || af == AF_UNSPEC) 572 for (tp = ip6protox; tp->pr_name; tp++) 573 printproto(tp, tp->pr_name); 574#endif /*INET6*/ 575#ifdef IPSEC 576 if (af == PF_KEY || af == AF_UNSPEC) 577 for (tp = pfkeyprotox; tp->pr_name; tp++) 578 printproto(tp, tp->pr_name); 579#endif /*IPSEC*/ 580 if (af == AF_IPX || af == AF_UNSPEC) { 581 kread(0, 0, 0); 582 for (tp = ipxprotox; tp->pr_name; tp++) 583 printproto(tp, tp->pr_name); 584 } 585 if (af == AF_APPLETALK || af == AF_UNSPEC) 586 for (tp = atalkprotox; tp->pr_name; tp++) 587 printproto(tp, tp->pr_name); 588 if (af == AF_NETGRAPH || af == AF_UNSPEC) 589 for (tp = netgraphprotox; tp->pr_name; tp++) 590 printproto(tp, tp->pr_name); 591#ifdef NS 592 if (af == AF_NS || af == AF_UNSPEC) 593 for (tp = nsprotox; tp->pr_name; tp++) 594 printproto(tp, tp->pr_name); 595#endif 596#ifdef ISO 597 if (af == AF_ISO || af == AF_UNSPEC) 598 for (tp = isoprotox; tp->pr_name; tp++) 599 printproto(tp, tp->pr_name); 600#endif 601 if ((af == AF_UNIX || af == AF_UNSPEC) && !Lflag && !sflag) 602 unixpr(); 603 exit(0); 604} 605 606/* 607 * Print out protocol statistics or control blocks (per sflag). 608 * If the interface was not specifically requested, and the symbol 609 * is not in the namelist, ignore this one. 610 */ 611static void 612printproto(tp, name) 613 register struct protox *tp; 614 char *name; 615{ 616 void (*pr)(); 617 u_long off; 618 619 if (sflag) { 620 if (iflag) { 621 if (tp->pr_istats) 622 intpr(interval, nl[N_IFNET].n_value, 623 tp->pr_istats); 624 else if (pflag) 625 printf("%s: no per-interface stats routine\n", 626 tp->pr_name); 627 return; 628 } 629 else { 630 pr = tp->pr_stats; 631 if (!pr) { 632 if (pflag) 633 printf("%s: no stats routine\n", 634 tp->pr_name); 635 return; 636 } 637 off = tp->pr_usesysctl ? tp->pr_usesysctl 638 : nl[tp->pr_sindex].n_value; 639 } 640 } else { 641 pr = tp->pr_cblocks; 642 if (!pr) { 643 if (pflag) 644 printf("%s: no PCB routine\n", tp->pr_name); 645 return; 646 } 647 off = tp->pr_usesysctl ? tp->pr_usesysctl 648 : nl[tp->pr_index].n_value; 649 } 650 if (pr != NULL && (off || af != AF_UNSPEC)) 651 (*pr)(off, name, af); 652} 653 654/* 655 * Read kernel memory, return 0 on success. 656 */ 657int 658kread(u_long addr, char *buf, int size) 659{ 660 if (kvmd == 0) { 661 /* 662 * XXX. 663 */ 664 kvmd = kvm_openfiles(nlistf, memf, NULL, O_RDONLY, buf); 665 if (kvmd != NULL) { 666 if (kvm_nlist(kvmd, nl) < 0) { 667 if(nlistf) 668 errx(1, "%s: kvm_nlist: %s", nlistf, 669 kvm_geterr(kvmd)); 670 else 671 errx(1, "kvm_nlist: %s", kvm_geterr(kvmd)); 672 } 673 674 if (nl[0].n_type == 0) { 675 if(nlistf) 676 errx(1, "%s: no namelist", nlistf); 677 else 678 errx(1, "no namelist"); 679 } 680 } else { 681 warnx("kvm not available"); 682 return(-1); 683 } 684 } 685 if (!buf) 686 return (0); 687 if (kvm_read(kvmd, addr, buf, size) != size) { 688 warnx("%s", kvm_geterr(kvmd)); 689 return (-1); 690 } 691 return (0); 692} 693 694char * 695plural(int n) 696{ 697 return (n != 1 ? "s" : ""); 698} 699 700char * 701plurales(int n) 702{ 703 return (n != 1 ? "es" : ""); 704} 705 706/* 707 * Find the protox for the given "well-known" name. 708 */ 709static struct protox * 710knownname(char *name) 711{ 712 struct protox **tpp, *tp; 713 714 for (tpp = protoprotox; *tpp; tpp++) 715 for (tp = *tpp; tp->pr_name; tp++) 716 if (strcmp(tp->pr_name, name) == 0) 717 return (tp); 718 return (NULL); 719} 720 721/* 722 * Find the protox corresponding to name. 723 */ 724static struct protox * 725name2protox(char *name) 726{ 727 struct protox *tp; 728 char **alias; /* alias from p->aliases */ 729 struct protoent *p; 730 731 /* 732 * Try to find the name in the list of "well-known" names. If that 733 * fails, check if name is an alias for an Internet protocol. 734 */ 735 if ((tp = knownname(name)) != NULL) 736 return (tp); 737 738 setprotoent(1); /* make protocol lookup cheaper */ 739 while ((p = getprotoent()) != NULL) { 740 /* assert: name not same as p->name */ 741 for (alias = p->p_aliases; *alias; alias++) 742 if (strcmp(name, *alias) == 0) { 743 endprotoent(); 744 return (knownname(p->p_name)); 745 } 746 } 747 endprotoent(); 748 return (NULL); 749} 750 751static void 752usage(void) 753{ 754 (void)fprintf(stderr, "%s\n%s\n%s\n%s\n%s\n", 755"usage: netstat [-AaLlnW] [-f address_family] [-M core] [-N system]", 756" netstat [-abdgilnrsS] [-f address_family] [-M core] [-N system]", 757" netstat [-bdn] [-I interface] [-M core] [-N system] [-w wait]", 758" netstat -m [-M core] [-N system]", 759" netstat [-M core] [-N system] [-p protocol]"); 760 exit(1); 761} 762