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 1.7 2004/12/24 02:23:50 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, 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 Pflag; /* show more protocol info (go past 80 columns) */ 311 int numeric_addr; /* show addresses numerically */ 312 int numeric_port; /* show ports numerically */ 313 static int pflag; /* show given protocol */ 314 int rflag; /* show routing tables (or routing stats) */ 315 int sflag; /* show protocol statistics */ 316 int tflag; /* show i/f watchdog timers */ 317 int Bflag; /* show buffer limit instead of buffer use */ 318 int Wflag; /* wide display */ 319 int zflag; /* zero stats */ 320 321 int interval; /* repeat interval for i/f stats */ 322 323 char *interface; /* desired i/f for stats, or NULL for all i/fs */ 324 int unit; /* unit number for above */ 325 326 int af; /* address family */ 327 328 int 329 main(int argc, char **argv) 330 { 331 register struct protox *tp = NULL; /* for printing cblocks & stats */ 332 int ch; 333 334 af = AF_UNSPEC; 335 336 while ((ch = getopt(argc, argv, "Aabdf:gI:iLlM:mN:nPp:rSsBtuWw:z")) != -1) 337 switch(ch) { 338 case 'A': 339 Aflag = 1; 340 break; 341 case 'a': 342 aflag = 1; 343 break; 344 case 'b': 345 bflag = 1; 346 break; 347 case 'd': 348 dflag = 1; 349 break; 350 case 'f': 351 #ifdef NS 352 if (strcmp(optarg, "ns") == 0) 353 af = AF_NS; 354 else 355 #endif 356 if (strcmp(optarg, "ipx") == 0) 357 af = AF_IPX; 358 else if (strcmp(optarg, "inet") == 0) 359 af = AF_INET; 360 #ifdef INET6 361 else if (strcmp(optarg, "inet6") == 0) 362 af = AF_INET6; 363 #endif /*INET6*/ 364 #ifdef INET6 365 else if (strcmp(optarg, "pfkey") == 0) 366 af = PF_KEY; 367 #endif /*INET6*/ 368 else if (strcmp(optarg, "unix") == 0) 369 af = AF_UNIX; 370 else if (strcmp(optarg, "atalk") == 0) 371 af = AF_APPLETALK; 372 else if (strcmp(optarg, "ng") == 0 373 || strcmp(optarg, "netgraph") == 0) 374 af = AF_NETGRAPH; 375 #ifdef ISO 376 else if (strcmp(optarg, "iso") == 0) 377 af = AF_ISO; 378 #endif 379 else if (strcmp(optarg, "link") == 0) 380 af = AF_LINK; 381 else { 382 errx(1, "%s: unknown address family", optarg); 383 } 384 break; 385 case 'g': 386 gflag = 1; 387 break; 388 case 'I': { 389 char *cp; 390 391 iflag = 1; 392 for (cp = interface = optarg; isalpha(*cp); cp++) 393 continue; 394 unit = atoi(cp); 395 break; 396 } 397 case 'i': 398 iflag = 1; 399 break; 400 case 'L': 401 Lflag = 1; 402 break; 403 case 'M': 404 memf = optarg; 405 break; 406 case 'm': 407 mflag = 1; 408 break; 409 case 'N': 410 nlistf = optarg; 411 break; 412 case 'n': 413 numeric_addr = numeric_port = 1; 414 break; 415 case 'P': 416 Pflag = 1; 417 break; 418 case 'p': 419 if ((tp = name2protox(optarg)) == NULL) { 420 errx(1, 421 "%s: unknown or uninstrumented protocol", 422 optarg); 423 } 424 pflag = 1; 425 break; 426 case 'r': 427 rflag = 1; 428 break; 429 case 's': 430 ++sflag; 431 break; 432 case 'S': 433 numeric_addr = 1; 434 break; 435 case 'B': 436 Bflag = 1; 437 break; 438 case 't': 439 tflag = 1; 440 break; 441 case 'u': 442 af = AF_UNIX; 443 break; 444 case 'W': 445 case 'l': 446 Wflag = 1; 447 break; 448 case 'w': 449 interval = atoi(optarg); 450 iflag = 1; 451 break; 452 case 'z': 453 zflag = 1; 454 break; 455 case '?': 456 default: 457 usage(); 458 } 459 argv += optind; 460 argc -= optind; 461 462 #define BACKWARD_COMPATIBILITY 463 #ifdef BACKWARD_COMPATIBILITY 464 if (*argv) { 465 if (isdigit(**argv)) { 466 interval = atoi(*argv); 467 if (interval <= 0) 468 usage(); 469 ++argv; 470 iflag = 1; 471 } 472 if (*argv) { 473 nlistf = *argv; 474 if (*++argv) 475 memf = *argv; 476 } 477 } 478 #endif 479 480 /* 481 * Discard setgid privileges if not the running kernel so that bad 482 * guys can't print interesting stuff from kernel memory. 483 */ 484 if (nlistf != NULL || memf != NULL) 485 setgid(getgid()); 486 487 if (mflag) { 488 if (memf != NULL) { 489 if (kread(0, 0, 0) == 0) 490 mbpr(nl[N_MBSTAT].n_value, 491 nl[N_MBTYPES].n_value, 492 nl[N_NMBCLUSTERS].n_value, 493 nl[N_NMBUFS].n_value); 494 } else 495 mbpr(0, 0, 0, 0); 496 exit(0); 497 } 498 #if 0 499 /* 500 * Keep file descriptors open to avoid overhead 501 * of open/close on each call to get* routines. 502 */ 503 sethostent(1); 504 setnetent(1); 505 #else 506 /* 507 * This does not make sense any more with DNS being default over 508 * the files. Doing a setXXXXent(1) causes a tcp connection to be 509 * used for the queries, which is slower. 510 */ 511 #endif 512 if (iflag && !sflag) { 513 kread(0, 0, 0); 514 intpr(interval, nl[N_IFNET].n_value, NULL); 515 exit(0); 516 } 517 if (rflag) { 518 kread(0, 0, 0); 519 if (sflag) 520 rt_stats(nl[N_RTSTAT].n_value, nl[N_RTTRASH].n_value); 521 else 522 routepr(nl[N_RTREE].n_value); 523 exit(0); 524 } 525 if (gflag) { 526 kread(0, 0, 0); 527 if (sflag) { 528 if (af == AF_INET || af == AF_UNSPEC) 529 mrt_stats(nl[N_MRTSTAT].n_value); 530 #ifdef INET6 531 if (af == AF_INET6 || af == AF_UNSPEC) 532 mrt6_stats(nl[N_MRT6STAT].n_value); 533 #endif 534 } else { 535 if (af == AF_INET || af == AF_UNSPEC) 536 mroutepr(nl[N_MFCTABLE].n_value, 537 nl[N_VIFTABLE].n_value); 538 #ifdef INET6 539 if (af == AF_INET6 || af == AF_UNSPEC) 540 mroute6pr(nl[N_MF6CTABLE].n_value, 541 nl[N_MIF6TABLE].n_value); 542 #endif 543 } 544 exit(0); 545 } 546 547 kread(0, 0, 0); 548 if (tp) { 549 printproto(tp, tp->pr_name); 550 exit(0); 551 } 552 if (af == AF_INET || af == AF_UNSPEC) 553 for (tp = protox; tp->pr_name; tp++) 554 printproto(tp, tp->pr_name); 555 #ifdef INET6 556 if (af == AF_INET6 || af == AF_UNSPEC) 557 for (tp = ip6protox; tp->pr_name; tp++) 558 printproto(tp, tp->pr_name); 559 #endif /*INET6*/ 560 #ifdef IPSEC 561 if (af == PF_KEY || af == AF_UNSPEC) 562 for (tp = pfkeyprotox; tp->pr_name; tp++) 563 printproto(tp, tp->pr_name); 564 #endif /*IPSEC*/ 565 if (af == AF_IPX || af == AF_UNSPEC) { 566 kread(0, 0, 0); 567 for (tp = ipxprotox; tp->pr_name; tp++) 568 printproto(tp, tp->pr_name); 569 } 570 if (af == AF_APPLETALK || af == AF_UNSPEC) 571 for (tp = atalkprotox; tp->pr_name; tp++) 572 printproto(tp, tp->pr_name); 573 if (af == AF_NETGRAPH || af == AF_UNSPEC) 574 for (tp = netgraphprotox; tp->pr_name; tp++) 575 printproto(tp, tp->pr_name); 576 #ifdef NS 577 if (af == AF_NS || af == AF_UNSPEC) 578 for (tp = nsprotox; tp->pr_name; tp++) 579 printproto(tp, tp->pr_name); 580 #endif 581 #ifdef ISO 582 if (af == AF_ISO || af == AF_UNSPEC) 583 for (tp = isoprotox; tp->pr_name; tp++) 584 printproto(tp, tp->pr_name); 585 #endif 586 if ((af == AF_UNIX || af == AF_UNSPEC) && !Lflag && !sflag) 587 unixpr(); 588 exit(0); 589 } 590 591 /* 592 * Print out protocol statistics or control blocks (per sflag). 593 * If the interface was not specifically requested, and the symbol 594 * is not in the namelist, ignore this one. 595 */ 596 static void 597 printproto(register struct protox *tp, char *name) 598 { 599 void (*pr)(u_long, char *, int); 600 u_long off; 601 602 if (sflag) { 603 if (iflag) { 604 if (tp->pr_istats) 605 intpr(interval, nl[N_IFNET].n_value, 606 tp->pr_istats); 607 else if (pflag) 608 printf("%s: no per-interface stats routine\n", 609 tp->pr_name); 610 return; 611 } 612 else { 613 pr = tp->pr_stats; 614 if (!pr) { 615 if (pflag) 616 printf("%s: no stats routine\n", 617 tp->pr_name); 618 return; 619 } 620 off = tp->pr_usesysctl ? tp->pr_usesysctl 621 : nl[tp->pr_sindex].n_value; 622 } 623 } else { 624 pr = tp->pr_cblocks; 625 if (!pr) { 626 if (pflag) 627 printf("%s: no PCB routine\n", tp->pr_name); 628 return; 629 } 630 off = tp->pr_usesysctl ? tp->pr_usesysctl 631 : nl[tp->pr_index].n_value; 632 } 633 if (pr != NULL && (off || af != AF_UNSPEC)) 634 (*pr)(off, name, af); 635 } 636 637 /* 638 * Read kernel memory, return 0 on success. 639 */ 640 int 641 kread(u_long addr, char *buf, int size) 642 { 643 if (kvmd == 0) { 644 /* 645 * XXX. 646 */ 647 kvmd = kvm_openfiles(nlistf, memf, NULL, O_RDONLY, buf); 648 if (kvmd != NULL) { 649 if (kvm_nlist(kvmd, nl) < 0) { 650 if(nlistf) 651 errx(1, "%s: kvm_nlist: %s", nlistf, 652 kvm_geterr(kvmd)); 653 else 654 errx(1, "kvm_nlist: %s", kvm_geterr(kvmd)); 655 } 656 657 if (nl[0].n_type == 0) { 658 if(nlistf) 659 errx(1, "%s: no namelist", nlistf); 660 else 661 errx(1, "no namelist"); 662 } 663 } else { 664 warnx("kvm not available"); 665 return(-1); 666 } 667 } 668 if (!buf) 669 return (0); 670 if (kvm_read(kvmd, addr, buf, size) != size) { 671 warnx("%s", kvm_geterr(kvmd)); 672 return (-1); 673 } 674 return (0); 675 } 676 677 char * 678 plural(int n) 679 { 680 return (n != 1 ? "s" : ""); 681 } 682 683 char * 684 plurales(int n) 685 { 686 return (n != 1 ? "es" : ""); 687 } 688 689 /* 690 * Find the protox for the given "well-known" name. 691 */ 692 static struct protox * 693 knownname(char *name) 694 { 695 struct protox **tpp, *tp; 696 697 for (tpp = protoprotox; *tpp; tpp++) 698 for (tp = *tpp; tp->pr_name; tp++) 699 if (strcmp(tp->pr_name, name) == 0) 700 return (tp); 701 return (NULL); 702 } 703 704 /* 705 * Find the protox corresponding to name. 706 */ 707 static struct protox * 708 name2protox(char *name) 709 { 710 struct protox *tp; 711 char **alias; /* alias from p->aliases */ 712 struct protoent *p; 713 714 /* 715 * Try to find the name in the list of "well-known" names. If that 716 * fails, check if name is an alias for an Internet protocol. 717 */ 718 if ((tp = knownname(name)) != NULL) 719 return (tp); 720 721 setprotoent(1); /* make protocol lookup cheaper */ 722 while ((p = getprotoent()) != NULL) { 723 /* assert: name not same as p->name */ 724 for (alias = p->p_aliases; *alias; alias++) 725 if (strcmp(name, *alias) == 0) { 726 endprotoent(); 727 return (knownname(p->p_name)); 728 } 729 } 730 endprotoent(); 731 return (NULL); 732 } 733 734 static void 735 usage(void) 736 { 737 (void)fprintf(stderr, "%s\n%s\n%s\n%s\n%s\n%s\n%s\n%s\n%s\n%s\n", 738 "usage: netstat [-AaLnSW] [-f protocol_family | -p protocol]\n" 739 " [-M core] [-N system]", 740 " netstat -i | -I interface [-abdnt] [-f address_family]\n" 741 " [-M core] [-N system]", 742 " netstat -w wait [-I interface] [-d] [-M core] [-N system]", 743 " netstat -s [-s] [-z] [-f protocol_family | -p protocol] [-M core]", 744 " netstat -i | -I interface -s [-f protocol_family | -p protocol]\n" 745 " [-M core] [-N system]", 746 " netstat -m [-M core] [-N system]", 747 " netstat -r [-AanW] [-f address_family] [-M core] [-N system]", 748 " netstat -rs [-s] [-M core] [-N system]", 749 " netstat -g [-W] [-f address_family] [-M core] [-N system]", 750 " netstat -gs [-s] [-f address_family] [-M core] [-N system]"); 751 exit(1); 752 } 753