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 * @(#) Copyright (c) 1983, 1988, 1993 Regents of the University of California. All rights reserved. 34 * @(#)main.c 8.4 (Berkeley) 3/1/94 35 * $FreeBSD: src/usr.bin/netstat/main.c,v 1.34.2.12 2001/09/17 15:17:46 ru Exp $ 36 * $DragonFly: src/usr.bin/netstat/main.c,v 1.3 2003/08/08 04:18:43 dillon Exp $ 37 */ 38 39 #include <sys/param.h> 40 #include <sys/file.h> 41 #include <sys/protosw.h> 42 #include <sys/socket.h> 43 44 #include <netinet/in.h> 45 46 #include <netgraph/socket/ng_socket.h> 47 48 #include <ctype.h> 49 #include <err.h> 50 #include <errno.h> 51 #include <kvm.h> 52 #include <limits.h> 53 #include <netdb.h> 54 #include <nlist.h> 55 #include <paths.h> 56 #include <stdio.h> 57 #include <stdlib.h> 58 #include <string.h> 59 #include <unistd.h> 60 #include "netstat.h" 61 62 static struct nlist nl[] = { 63 #define N_IFNET 0 64 { "_ifnet" }, 65 #define N_IMP 1 66 { "_imp_softc" }, 67 #define N_RTSTAT 2 68 { "_rtstat" }, 69 #define N_UNIXSW 3 70 { "_localsw" }, 71 #define N_IDP 4 72 { "_nspcb"}, 73 #define N_IDPSTAT 5 74 { "_idpstat"}, 75 #define N_SPPSTAT 6 76 { "_spp_istat"}, 77 #define N_NSERR 7 78 { "_ns_errstat"}, 79 #define N_CLNPSTAT 8 80 { "_clnp_stat"}, 81 #define IN_NOTUSED 9 82 { "_tp_inpcb" }, 83 #define ISO_TP 10 84 { "_tp_refinfo" }, 85 #define N_TPSTAT 11 86 { "_tp_stat" }, 87 #define N_ESISSTAT 12 88 { "_esis_stat"}, 89 #define N_NIMP 13 90 { "_nimp"}, 91 #define N_RTREE 14 92 { "_rt_tables"}, 93 #define N_CLTP 15 94 { "_cltb"}, 95 #define N_CLTPSTAT 16 96 { "_cltpstat"}, 97 #define N_NFILE 17 98 { "_nfile" }, 99 #define N_FILE 18 100 { "_file" }, 101 #define N_MRTSTAT 19 102 { "_mrtstat" }, 103 #define N_MFCTABLE 20 104 { "_mfctable" }, 105 #define N_VIFTABLE 21 106 { "_viftable" }, 107 #define N_IPX 22 108 { "_ipxpcb"}, 109 #define N_IPXSTAT 23 110 { "_ipxstat"}, 111 #define N_SPXSTAT 24 112 { "_spx_istat"}, 113 #define N_DDPSTAT 25 114 { "_ddpstat"}, 115 #define N_DDPCB 26 116 { "_ddpcb"}, 117 #define N_NGSOCKS 27 118 { "_ngsocklist"}, 119 #define N_IP6STAT 28 120 { "_ip6stat" }, 121 #define N_ICMP6STAT 29 122 { "_icmp6stat" }, 123 #define N_IPSECSTAT 30 124 { "_ipsecstat" }, 125 #define N_IPSEC6STAT 31 126 { "_ipsec6stat" }, 127 #define N_PIM6STAT 32 128 { "_pim6stat" }, 129 #define N_MRT6PROTO 33 130 { "_ip6_mrtproto" }, 131 #define N_MRT6STAT 34 132 { "_mrt6stat" }, 133 #define N_MF6CTABLE 35 134 { "_mf6ctable" }, 135 #define N_MIF6TABLE 36 136 { "_mif6table" }, 137 #define N_PFKEYSTAT 37 138 { "_pfkeystat" }, 139 #define N_MBSTAT 38 140 { "_mbstat" }, 141 #define N_MBTYPES 39 142 { "_mbtypes" }, 143 #define N_NMBCLUSTERS 40 144 { "_nmbclusters" }, 145 #define N_NMBUFS 41 146 { "_nmbufs" }, 147 #define N_RTTRASH 42 148 { "_rttrash" }, 149 { "" }, 150 }; 151 152 struct protox { 153 u_char pr_index; /* index into nlist of cb head */ 154 u_char pr_sindex; /* index into nlist of stat block */ 155 u_char pr_wanted; /* 1 if wanted, 0 otherwise */ 156 void (*pr_cblocks)(u_long, char *, int); 157 /* control blocks printing routine */ 158 void (*pr_stats)(u_long, char *, int); 159 /* statistics printing routine */ 160 void (*pr_istats)(char *); /* per/if statistics printing routine */ 161 char *pr_name; /* well-known name */ 162 int pr_usesysctl; /* true if we use sysctl, not kvm */ 163 } protox[] = { 164 { -1, -1, 1, protopr, 165 tcp_stats, NULL, "tcp", IPPROTO_TCP }, 166 { -1, -1, 1, protopr, 167 udp_stats, NULL, "udp", IPPROTO_UDP }, 168 { -1, -1, 1, protopr, 169 NULL, NULL, "divert",IPPROTO_DIVERT }, 170 { -1, -1, 1, protopr, 171 ip_stats, NULL, "ip", IPPROTO_RAW }, 172 { -1, -1, 1, protopr, 173 icmp_stats, NULL, "icmp", IPPROTO_ICMP }, 174 { -1, -1, 1, protopr, 175 igmp_stats, NULL, "igmp", IPPROTO_IGMP }, 176 #ifdef IPSEC 177 { -1, N_IPSECSTAT, 1, 0, 178 ipsec_stats, NULL, "ipsec", 0}, 179 #endif 180 { -1, -1, 1, 0, 181 bdg_stats, NULL, "bdg", 1 /* bridging... */ }, 182 { -1, -1, 0, 0, 183 0, NULL, 0 } 184 }; 185 186 #ifdef INET6 187 struct protox ip6protox[] = { 188 { -1, -1, 1, protopr, 189 tcp_stats, NULL, "tcp", IPPROTO_TCP }, 190 { -1, -1, 1, protopr, 191 udp_stats, NULL, "udp", IPPROTO_UDP }, 192 { -1, N_IP6STAT, 1, protopr, 193 ip6_stats, ip6_ifstats, "ip6", IPPROTO_RAW }, 194 { -1, N_ICMP6STAT, 1, protopr, 195 icmp6_stats, icmp6_ifstats, "icmp6",IPPROTO_ICMPV6 }, 196 #ifdef IPSEC 197 { -1, N_IPSEC6STAT, 1, 0, 198 ipsec_stats, NULL, "ipsec6",0 }, 199 #endif 200 #ifdef notyet 201 { -1, N_PIM6STAT, 1, 0, 202 pim6_stats, NULL, "pim6", 0 }, 203 #endif 204 { -1, -1, 1, 0, 205 rip6_stats, NULL, "rip6", 0 }, 206 { -1, -1, 1, 0, 207 bdg_stats, NULL, "bdg", 1 /* bridging... */ }, 208 { -1, -1, 0, 0, 209 0, NULL, 0, 0 } 210 }; 211 #endif /*INET6*/ 212 213 #ifdef IPSEC 214 struct protox pfkeyprotox[] = { 215 { -1, N_PFKEYSTAT, 1, 0, 216 pfkey_stats, NULL, "pfkey", 0 }, 217 { -1, -1, 0, 0, 218 0, NULL, 0, 0 } 219 }; 220 #endif 221 222 struct protox atalkprotox[] = { 223 { N_DDPCB, N_DDPSTAT, 1, atalkprotopr, 224 ddp_stats, NULL, "ddp" }, 225 { -1, -1, 0, 0, 226 0, NULL, 0 } 227 }; 228 229 struct protox netgraphprotox[] = { 230 { N_NGSOCKS, -1, 1, netgraphprotopr, 231 NULL, NULL, "ctrl" }, 232 { N_NGSOCKS, -1, 1, netgraphprotopr, 233 NULL, NULL, "data" }, 234 { -1, NULL, 0, 0, 235 0, NULL, 0 } 236 }; 237 238 struct protox ipxprotox[] = { 239 { N_IPX, N_IPXSTAT, 1, ipxprotopr, 240 ipx_stats, NULL, "ipx", 0 }, 241 { N_IPX, N_SPXSTAT, 1, ipxprotopr, 242 spx_stats, NULL, "spx", 0 }, 243 { -1, -1, 0, 0, 244 0, NULL, 0, 0 } 245 }; 246 247 #ifdef NS 248 struct protox nsprotox[] = { 249 { N_IDP, N_IDPSTAT, 1, nsprotopr, 250 idp_stats, NULL, "idp" }, 251 { N_IDP, N_SPPSTAT, 1, nsprotopr, 252 spp_stats, NULL, "spp" }, 253 { -1, N_NSERR, 1, 0, 254 nserr_stats, NULL, "ns_err" }, 255 { -1, -1, 0, 0, 256 0, NULL, 0 } 257 }; 258 #endif 259 260 #ifdef ISO 261 struct protox isoprotox[] = { 262 { ISO_TP, N_TPSTAT, 1, iso_protopr, 263 tp_stats, NULL, "tp" }, 264 { N_CLTP, N_CLTPSTAT, 1, iso_protopr, 265 cltp_stats, NULL, "cltp" }, 266 { -1, N_CLNPSTAT, 1, 0, 267 clnp_stats, NULL, "clnp"}, 268 { -1, N_ESISSTAT, 1, 0, 269 esis_stats, NULL, "esis"}, 270 { -1, -1, 0, 0, 271 0, NULL, 0 } 272 }; 273 #endif 274 275 struct protox *protoprotox[] = { 276 protox, 277 #ifdef INET6 278 ip6protox, 279 #endif 280 #ifdef IPSEC 281 pfkeyprotox, 282 #endif 283 ipxprotox, atalkprotox, 284 #ifdef NS 285 nsprotox, 286 #endif 287 #ifdef ISO 288 isoprotox, 289 #endif 290 NULL }; 291 292 static void printproto (struct protox *, char *); 293 static void usage (void); 294 static struct protox *name2protox (char *); 295 static struct protox *knownname (char *); 296 297 static kvm_t *kvmd; 298 static char *nlistf = NULL, *memf = NULL; 299 300 int Aflag; /* show addresses of protocol control block */ 301 int aflag; /* show all sockets (including servers) */ 302 int bflag; /* show i/f total bytes in/out */ 303 int dflag; /* show i/f dropped packets */ 304 int gflag; /* show group (multicast) routing or stats */ 305 int iflag; /* show interfaces */ 306 int Lflag; /* show size of listen queues */ 307 int mflag; /* show memory stats */ 308 int numeric_addr; /* show addresses numerically */ 309 int numeric_port; /* show ports numerically */ 310 static int pflag; /* show given protocol */ 311 int rflag; /* show routing tables (or routing stats) */ 312 int sflag; /* show protocol statistics */ 313 int tflag; /* show i/f watchdog timers */ 314 int Wflag; /* wide display */ 315 int zflag; /* zero stats */ 316 317 int interval; /* repeat interval for i/f stats */ 318 319 char *interface; /* desired i/f for stats, or NULL for all i/fs */ 320 int unit; /* unit number for above */ 321 322 int af; /* address family */ 323 324 int 325 main(argc, argv) 326 int argc; 327 char *argv[]; 328 { 329 register struct protox *tp = NULL; /* for printing cblocks & stats */ 330 int ch; 331 332 af = AF_UNSPEC; 333 334 while ((ch = getopt(argc, argv, "Aabdf:gI:iLlM:mN:np:rSstuWw:z")) != -1) 335 switch(ch) { 336 case 'A': 337 Aflag = 1; 338 break; 339 case 'a': 340 aflag = 1; 341 break; 342 case 'b': 343 bflag = 1; 344 break; 345 case 'd': 346 dflag = 1; 347 break; 348 case 'f': 349 #ifdef NS 350 if (strcmp(optarg, "ns") == 0) 351 af = AF_NS; 352 else 353 #endif 354 if (strcmp(optarg, "ipx") == 0) 355 af = AF_IPX; 356 else if (strcmp(optarg, "inet") == 0) 357 af = AF_INET; 358 #ifdef INET6 359 else if (strcmp(optarg, "inet6") == 0) 360 af = AF_INET6; 361 #endif /*INET6*/ 362 #ifdef INET6 363 else if (strcmp(optarg, "pfkey") == 0) 364 af = PF_KEY; 365 #endif /*INET6*/ 366 else if (strcmp(optarg, "unix") == 0) 367 af = AF_UNIX; 368 else if (strcmp(optarg, "atalk") == 0) 369 af = AF_APPLETALK; 370 else if (strcmp(optarg, "ng") == 0 371 || strcmp(optarg, "netgraph") == 0) 372 af = AF_NETGRAPH; 373 #ifdef ISO 374 else if (strcmp(optarg, "iso") == 0) 375 af = AF_ISO; 376 #endif 377 else if (strcmp(optarg, "link") == 0) 378 af = AF_LINK; 379 else { 380 errx(1, "%s: unknown address family", optarg); 381 } 382 break; 383 case 'g': 384 gflag = 1; 385 break; 386 case 'I': { 387 char *cp; 388 389 iflag = 1; 390 for (cp = interface = optarg; isalpha(*cp); cp++) 391 continue; 392 unit = atoi(cp); 393 break; 394 } 395 case 'i': 396 iflag = 1; 397 break; 398 case 'L': 399 Lflag = 1; 400 break; 401 case 'M': 402 memf = optarg; 403 break; 404 case 'm': 405 mflag = 1; 406 break; 407 case 'N': 408 nlistf = optarg; 409 break; 410 case 'n': 411 numeric_addr = numeric_port = 1; 412 break; 413 case 'p': 414 if ((tp = name2protox(optarg)) == NULL) { 415 errx(1, 416 "%s: unknown or uninstrumented protocol", 417 optarg); 418 } 419 pflag = 1; 420 break; 421 case 'r': 422 rflag = 1; 423 break; 424 case 's': 425 ++sflag; 426 break; 427 case 'S': 428 numeric_addr = 1; 429 break; 430 case 't': 431 tflag = 1; 432 break; 433 case 'u': 434 af = AF_UNIX; 435 break; 436 case 'W': 437 case 'l': 438 Wflag = 1; 439 break; 440 case 'w': 441 interval = atoi(optarg); 442 iflag = 1; 443 break; 444 case 'z': 445 zflag = 1; 446 break; 447 case '?': 448 default: 449 usage(); 450 } 451 argv += optind; 452 argc -= optind; 453 454 #define BACKWARD_COMPATIBILITY 455 #ifdef BACKWARD_COMPATIBILITY 456 if (*argv) { 457 if (isdigit(**argv)) { 458 interval = atoi(*argv); 459 if (interval <= 0) 460 usage(); 461 ++argv; 462 iflag = 1; 463 } 464 if (*argv) { 465 nlistf = *argv; 466 if (*++argv) 467 memf = *argv; 468 } 469 } 470 #endif 471 472 /* 473 * Discard setgid privileges if not the running kernel so that bad 474 * guys can't print interesting stuff from kernel memory. 475 */ 476 if (nlistf != NULL || memf != NULL) 477 setgid(getgid()); 478 479 if (mflag) { 480 if (memf != NULL) { 481 if (kread(0, 0, 0) == 0) 482 mbpr(nl[N_MBSTAT].n_value, 483 nl[N_MBTYPES].n_value, 484 nl[N_NMBCLUSTERS].n_value, 485 nl[N_NMBUFS].n_value); 486 } else 487 mbpr(0, 0, 0, 0); 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 && !sflag) { 505 kread(0, 0, 0); 506 intpr(interval, nl[N_IFNET].n_value, NULL); 507 exit(0); 508 } 509 if (rflag) { 510 kread(0, 0, 0); 511 if (sflag) 512 rt_stats(nl[N_RTSTAT].n_value, nl[N_RTTRASH].n_value); 513 else 514 routepr(nl[N_RTREE].n_value); 515 exit(0); 516 } 517 if (gflag) { 518 kread(0, 0, 0); 519 if (sflag) { 520 if (af == AF_INET || af == AF_UNSPEC) 521 mrt_stats(nl[N_MRTSTAT].n_value); 522 #ifdef INET6 523 if (af == AF_INET6 || af == AF_UNSPEC) 524 mrt6_stats(nl[N_MRT6STAT].n_value); 525 #endif 526 } else { 527 if (af == AF_INET || af == AF_UNSPEC) 528 mroutepr(nl[N_MFCTABLE].n_value, 529 nl[N_VIFTABLE].n_value); 530 #ifdef INET6 531 if (af == AF_INET6 || af == AF_UNSPEC) 532 mroute6pr(nl[N_MF6CTABLE].n_value, 533 nl[N_MIF6TABLE].n_value); 534 #endif 535 } 536 exit(0); 537 } 538 539 kread(0, 0, 0); 540 if (tp) { 541 printproto(tp, tp->pr_name); 542 exit(0); 543 } 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)(u_long, char *, int); 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 else if (pflag) 602 printf("%s: no per-interface stats routine\n", 603 tp->pr_name); 604 return; 605 } 606 else { 607 pr = tp->pr_stats; 608 if (!pr) { 609 if (pflag) 610 printf("%s: no stats routine\n", 611 tp->pr_name); 612 return; 613 } 614 off = tp->pr_usesysctl ? tp->pr_usesysctl 615 : nl[tp->pr_sindex].n_value; 616 } 617 } else { 618 pr = tp->pr_cblocks; 619 if (!pr) { 620 if (pflag) 621 printf("%s: no PCB routine\n", tp->pr_name); 622 return; 623 } 624 off = tp->pr_usesysctl ? tp->pr_usesysctl 625 : nl[tp->pr_index].n_value; 626 } 627 if (pr != NULL && (off || af != AF_UNSPEC)) 628 (*pr)(off, name, af); 629 } 630 631 /* 632 * Read kernel memory, return 0 on success. 633 */ 634 int 635 kread(u_long addr, char *buf, int size) 636 { 637 if (kvmd == 0) { 638 /* 639 * XXX. 640 */ 641 kvmd = kvm_openfiles(nlistf, memf, NULL, O_RDONLY, buf); 642 if (kvmd != NULL) { 643 if (kvm_nlist(kvmd, nl) < 0) { 644 if(nlistf) 645 errx(1, "%s: kvm_nlist: %s", nlistf, 646 kvm_geterr(kvmd)); 647 else 648 errx(1, "kvm_nlist: %s", kvm_geterr(kvmd)); 649 } 650 651 if (nl[0].n_type == 0) { 652 if(nlistf) 653 errx(1, "%s: no namelist", nlistf); 654 else 655 errx(1, "no namelist"); 656 } 657 } else { 658 warnx("kvm not available"); 659 return(-1); 660 } 661 } 662 if (!buf) 663 return (0); 664 if (kvm_read(kvmd, addr, buf, size) != size) { 665 warnx("%s", kvm_geterr(kvmd)); 666 return (-1); 667 } 668 return (0); 669 } 670 671 char * 672 plural(int n) 673 { 674 return (n != 1 ? "s" : ""); 675 } 676 677 char * 678 plurales(int n) 679 { 680 return (n != 1 ? "es" : ""); 681 } 682 683 /* 684 * Find the protox for the given "well-known" name. 685 */ 686 static struct protox * 687 knownname(char *name) 688 { 689 struct protox **tpp, *tp; 690 691 for (tpp = protoprotox; *tpp; tpp++) 692 for (tp = *tpp; tp->pr_name; tp++) 693 if (strcmp(tp->pr_name, name) == 0) 694 return (tp); 695 return (NULL); 696 } 697 698 /* 699 * Find the protox corresponding to name. 700 */ 701 static struct protox * 702 name2protox(char *name) 703 { 704 struct protox *tp; 705 char **alias; /* alias from p->aliases */ 706 struct protoent *p; 707 708 /* 709 * Try to find the name in the list of "well-known" names. If that 710 * fails, check if name is an alias for an Internet protocol. 711 */ 712 if ((tp = knownname(name)) != NULL) 713 return (tp); 714 715 setprotoent(1); /* make protocol lookup cheaper */ 716 while ((p = getprotoent()) != NULL) { 717 /* assert: name not same as p->name */ 718 for (alias = p->p_aliases; *alias; alias++) 719 if (strcmp(name, *alias) == 0) { 720 endprotoent(); 721 return (knownname(p->p_name)); 722 } 723 } 724 endprotoent(); 725 return (NULL); 726 } 727 728 static void 729 usage(void) 730 { 731 (void)fprintf(stderr, "%s\n%s\n%s\n%s\n%s\n%s\n%s\n%s\n%s\n%s\n", 732 "usage: netstat [-AaLnSW] [-f protocol_family | -p protocol]\n" 733 " [-M core] [-N system]", 734 " netstat -i | -I interface [-abdnt] [-f address_family]\n" 735 " [-M core] [-N system]", 736 " netstat -w wait [-I interface] [-d] [-M core] [-N system]", 737 " netstat -s [-s] [-z] [-f protocol_family | -p protocol] [-M core]", 738 " netstat -i | -I interface -s [-f protocol_family | -p protocol]\n" 739 " [-M core] [-N system]", 740 " netstat -m [-M core] [-N system]", 741 " netstat -r [-AanW] [-f address_family] [-M core] [-N system]", 742 " netstat -rs [-s] [-M core] [-N system]", 743 " netstat -g [-W] [-f address_family] [-M core] [-N system]", 744 " netstat -gs [-s] [-f address_family] [-M core] [-N system]"); 745 exit(1); 746 } 747