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 1.5 2003/10/04 20:36:49 hmp 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, 1, protopr, 209 pim_stats, NULL, "pim", IPPROTO_PIM }, 210 { -1, -1, 0, 0, 211 0, NULL, 0, 0 } 212 }; 213 #endif /*INET6*/ 214 215 #ifdef IPSEC 216 struct protox pfkeyprotox[] = { 217 { -1, N_PFKEYSTAT, 1, 0, 218 pfkey_stats, NULL, "pfkey", 0 }, 219 { -1, -1, 0, 0, 220 0, NULL, 0, 0 } 221 }; 222 #endif 223 224 struct protox atalkprotox[] = { 225 { N_DDPCB, N_DDPSTAT, 1, atalkprotopr, 226 ddp_stats, NULL, "ddp" }, 227 { -1, -1, 0, 0, 228 0, NULL, 0 } 229 }; 230 231 struct protox netgraphprotox[] = { 232 { N_NGSOCKS, -1, 1, netgraphprotopr, 233 NULL, NULL, "ctrl" }, 234 { N_NGSOCKS, -1, 1, netgraphprotopr, 235 NULL, NULL, "data" }, 236 { -1, NULL, 0, 0, 237 0, NULL, 0 } 238 }; 239 240 struct protox ipxprotox[] = { 241 { N_IPX, N_IPXSTAT, 1, ipxprotopr, 242 ipx_stats, NULL, "ipx", 0 }, 243 { N_IPX, N_SPXSTAT, 1, ipxprotopr, 244 spx_stats, NULL, "spx", 0 }, 245 { -1, -1, 0, 0, 246 0, NULL, 0, 0 } 247 }; 248 249 #ifdef NS 250 struct protox nsprotox[] = { 251 { N_IDP, N_IDPSTAT, 1, nsprotopr, 252 idp_stats, NULL, "idp" }, 253 { N_IDP, N_SPPSTAT, 1, nsprotopr, 254 spp_stats, NULL, "spp" }, 255 { -1, N_NSERR, 1, 0, 256 nserr_stats, NULL, "ns_err" }, 257 { -1, -1, 0, 0, 258 0, NULL, 0 } 259 }; 260 #endif 261 262 #ifdef ISO 263 struct protox isoprotox[] = { 264 { ISO_TP, N_TPSTAT, 1, iso_protopr, 265 tp_stats, NULL, "tp" }, 266 { N_CLTP, N_CLTPSTAT, 1, iso_protopr, 267 cltp_stats, NULL, "cltp" }, 268 { -1, N_CLNPSTAT, 1, 0, 269 clnp_stats, NULL, "clnp"}, 270 { -1, N_ESISSTAT, 1, 0, 271 esis_stats, NULL, "esis"}, 272 { -1, -1, 0, 0, 273 0, NULL, 0 } 274 }; 275 #endif 276 277 struct protox *protoprotox[] = { 278 protox, 279 #ifdef INET6 280 ip6protox, 281 #endif 282 #ifdef IPSEC 283 pfkeyprotox, 284 #endif 285 ipxprotox, atalkprotox, 286 #ifdef NS 287 nsprotox, 288 #endif 289 #ifdef ISO 290 isoprotox, 291 #endif 292 NULL }; 293 294 static void printproto (struct protox *, char *); 295 static void usage (void); 296 static struct protox *name2protox (char *); 297 static struct protox *knownname (char *); 298 299 static kvm_t *kvmd; 300 static char *nlistf = NULL, *memf = NULL; 301 302 int Aflag; /* show addresses of protocol control block */ 303 int aflag; /* show all sockets (including servers) */ 304 int bflag; /* show i/f total bytes in/out */ 305 int dflag; /* show i/f dropped packets */ 306 int gflag; /* show group (multicast) routing or stats */ 307 int iflag; /* show interfaces */ 308 int Lflag; /* show size of listen queues */ 309 int mflag; /* show memory stats */ 310 int numeric_addr; /* show addresses numerically */ 311 int numeric_port; /* show ports numerically */ 312 static int pflag; /* show given protocol */ 313 int rflag; /* show routing tables (or routing stats) */ 314 int sflag; /* show protocol statistics */ 315 int tflag; /* show i/f watchdog timers */ 316 int Wflag; /* wide display */ 317 int zflag; /* zero stats */ 318 319 int interval; /* repeat interval for i/f stats */ 320 321 char *interface; /* desired i/f for stats, or NULL for all i/fs */ 322 int unit; /* unit number for above */ 323 324 int af; /* address family */ 325 326 int 327 main(int argc, 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(register struct protox *tp, char *name) 590 { 591 void (*pr)(u_long, char *, int); 592 u_long off; 593 594 if (sflag) { 595 if (iflag) { 596 if (tp->pr_istats) 597 intpr(interval, nl[N_IFNET].n_value, 598 tp->pr_istats); 599 else if (pflag) 600 printf("%s: no per-interface stats routine\n", 601 tp->pr_name); 602 return; 603 } 604 else { 605 pr = tp->pr_stats; 606 if (!pr) { 607 if (pflag) 608 printf("%s: no stats routine\n", 609 tp->pr_name); 610 return; 611 } 612 off = tp->pr_usesysctl ? tp->pr_usesysctl 613 : nl[tp->pr_sindex].n_value; 614 } 615 } else { 616 pr = tp->pr_cblocks; 617 if (!pr) { 618 if (pflag) 619 printf("%s: no PCB routine\n", tp->pr_name); 620 return; 621 } 622 off = tp->pr_usesysctl ? tp->pr_usesysctl 623 : nl[tp->pr_index].n_value; 624 } 625 if (pr != NULL && (off || af != AF_UNSPEC)) 626 (*pr)(off, name, af); 627 } 628 629 /* 630 * Read kernel memory, return 0 on success. 631 */ 632 int 633 kread(u_long addr, char *buf, int size) 634 { 635 if (kvmd == 0) { 636 /* 637 * XXX. 638 */ 639 kvmd = kvm_openfiles(nlistf, memf, NULL, O_RDONLY, buf); 640 if (kvmd != NULL) { 641 if (kvm_nlist(kvmd, nl) < 0) { 642 if(nlistf) 643 errx(1, "%s: kvm_nlist: %s", nlistf, 644 kvm_geterr(kvmd)); 645 else 646 errx(1, "kvm_nlist: %s", kvm_geterr(kvmd)); 647 } 648 649 if (nl[0].n_type == 0) { 650 if(nlistf) 651 errx(1, "%s: no namelist", nlistf); 652 else 653 errx(1, "no namelist"); 654 } 655 } else { 656 warnx("kvm not available"); 657 return(-1); 658 } 659 } 660 if (!buf) 661 return (0); 662 if (kvm_read(kvmd, addr, buf, size) != size) { 663 warnx("%s", kvm_geterr(kvmd)); 664 return (-1); 665 } 666 return (0); 667 } 668 669 char * 670 plural(int n) 671 { 672 return (n != 1 ? "s" : ""); 673 } 674 675 char * 676 plurales(int n) 677 { 678 return (n != 1 ? "es" : ""); 679 } 680 681 /* 682 * Find the protox for the given "well-known" name. 683 */ 684 static struct protox * 685 knownname(char *name) 686 { 687 struct protox **tpp, *tp; 688 689 for (tpp = protoprotox; *tpp; tpp++) 690 for (tp = *tpp; tp->pr_name; tp++) 691 if (strcmp(tp->pr_name, name) == 0) 692 return (tp); 693 return (NULL); 694 } 695 696 /* 697 * Find the protox corresponding to name. 698 */ 699 static struct protox * 700 name2protox(char *name) 701 { 702 struct protox *tp; 703 char **alias; /* alias from p->aliases */ 704 struct protoent *p; 705 706 /* 707 * Try to find the name in the list of "well-known" names. If that 708 * fails, check if name is an alias for an Internet protocol. 709 */ 710 if ((tp = knownname(name)) != NULL) 711 return (tp); 712 713 setprotoent(1); /* make protocol lookup cheaper */ 714 while ((p = getprotoent()) != NULL) { 715 /* assert: name not same as p->name */ 716 for (alias = p->p_aliases; *alias; alias++) 717 if (strcmp(name, *alias) == 0) { 718 endprotoent(); 719 return (knownname(p->p_name)); 720 } 721 } 722 endprotoent(); 723 return (NULL); 724 } 725 726 static void 727 usage(void) 728 { 729 (void)fprintf(stderr, "%s\n%s\n%s\n%s\n%s\n%s\n%s\n%s\n%s\n%s\n", 730 "usage: netstat [-AaLnSW] [-f protocol_family | -p protocol]\n" 731 " [-M core] [-N system]", 732 " netstat -i | -I interface [-abdnt] [-f address_family]\n" 733 " [-M core] [-N system]", 734 " netstat -w wait [-I interface] [-d] [-M core] [-N system]", 735 " netstat -s [-s] [-z] [-f protocol_family | -p protocol] [-M core]", 736 " netstat -i | -I interface -s [-f protocol_family | -p protocol]\n" 737 " [-M core] [-N system]", 738 " netstat -m [-M core] [-N system]", 739 " netstat -r [-AanW] [-f address_family] [-M core] [-N system]", 740 " netstat -rs [-s] [-M core] [-N system]", 741 " netstat -g [-W] [-f address_family] [-M core] [-N system]", 742 " netstat -gs [-s] [-f address_family] [-M core] [-N system]"); 743 exit(1); 744 } 745