netstat.c revision 1.28
1 /* $NetBSD: netstat.c,v 1.28 2006/10/22 16:43:24 christos Exp $ */ 2 3 /*- 4 * Copyright (c) 1980, 1992, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. Neither the name of the University nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 */ 31 32 #include <sys/cdefs.h> 33 #ifndef lint 34 #if 0 35 static char sccsid[] = "@(#)netstat.c 8.1 (Berkeley) 6/6/93"; 36 #endif 37 __RCSID("$NetBSD: netstat.c,v 1.28 2006/10/22 16:43:24 christos Exp $"); 38 #endif /* not lint */ 39 40 /* 41 * netstat 42 */ 43 #include <sys/param.h> 44 #include <sys/socketvar.h> 45 #include <sys/mbuf.h> 46 #include <sys/protosw.h> 47 48 #include <netinet/in.h> 49 50 #include <arpa/inet.h> 51 #include <net/route.h> 52 53 #include <netinet/in_systm.h> 54 #include <netinet/ip.h> 55 #include <netinet/in_pcb.h> 56 #include <netinet/ip_icmp.h> 57 #include <netinet/icmp_var.h> 58 #include <netinet/ip_var.h> 59 #ifdef INET6 60 #include <netinet/ip6.h> 61 #include <netinet6/in6_pcb.h> 62 #endif 63 #include <netinet/tcp.h> 64 #include <netinet/tcpip.h> 65 #include <netinet/tcp_seq.h> 66 #define TCPSTATES 67 #include <netinet/tcp_fsm.h> 68 #include <netinet/tcp_timer.h> 69 #include <netinet/tcp_var.h> 70 #include <netinet/tcp_debug.h> 71 #include <netinet/udp.h> 72 #include <netinet/udp_var.h> 73 74 #include <netdb.h> 75 #include <stdlib.h> 76 #include <string.h> 77 78 #include "systat.h" 79 #include "extern.h" 80 81 static void fetchnetstat4(void *, int); 82 static void enter(struct inpcb *, struct socket *, int, const char *); 83 static const char *inetname(struct in_addr); 84 static void inetprint(struct in_addr *, int, const char *); 85 #ifdef INET6 86 static void fetchnetstat6(void *, int); 87 static void enter6(struct in6pcb *, struct socket *, int, const char *); 88 static const char *inet6name(struct in6_addr *); 89 static void inet6print(struct in6_addr *, int, const char *); 90 #endif 91 92 #define streq(a,b) (strcmp(a,b)==0) 93 94 struct netinfo { 95 struct netinfo *ni_forw, *ni_prev; 96 int ni_family; 97 short ni_line; /* line on screen */ 98 short ni_seen; /* 0 when not present in list */ 99 short ni_flags; 100 #define NIF_LACHG 0x1 /* local address changed */ 101 #define NIF_FACHG 0x2 /* foreign address changed */ 102 short ni_state; /* tcp state */ 103 const char *ni_proto; /* protocol */ 104 struct in_addr ni_laddr; /* local address */ 105 #ifdef INET6 106 struct in6_addr ni_laddr6; /* local address */ 107 #endif 108 long ni_lport; /* local port */ 109 struct in_addr ni_faddr; /* foreign address */ 110 #ifdef INET6 111 struct in6_addr ni_faddr6; /* foreign address */ 112 #endif 113 long ni_fport; /* foreign port */ 114 long ni_rcvcc; /* rcv buffer character count */ 115 long ni_sndcc; /* snd buffer character count */ 116 }; 117 118 static struct { 119 struct netinfo *ni_forw, *ni_prev; 120 } netcb; 121 122 struct netinfo *nhead; 123 124 static int aflag = 0; 125 int nflag = 0; 126 static int lastrow = 1; 127 128 WINDOW * 129 opennetstat(void) 130 { 131 132 sethostent(1); 133 setnetent(1); 134 return (subwin(stdscr, -1, 0, 5, 0)); 135 } 136 137 void 138 closenetstat(WINDOW *w) 139 { 140 struct netinfo *p; 141 142 endhostent(); 143 endnetent(); 144 p = netcb.ni_forw; 145 while (p != nhead) { 146 if (p->ni_line != -1) 147 lastrow--; 148 p->ni_line = -1; 149 p = p->ni_forw; 150 } 151 if (w != NULL) { 152 wclear(w); 153 wrefresh(w); 154 delwin(w); 155 } 156 } 157 158 static struct nlist namelist[] = { 159 #define X_TCBTABLE 0 160 { .n_name = "_tcbtable" }, 161 #define X_UDBTABLE 1 162 { .n_name = "_udbtable" }, 163 { .n_name = NULL }, 164 }; 165 166 int 167 initnetstat(void) 168 { 169 int n; 170 171 n = kvm_nlist(kd, namelist); 172 if (n < 0) { 173 nlisterr(namelist); 174 return(0); 175 } else if (n == sizeof(namelist) / sizeof(namelist[0]) - 1) { 176 error("No symbols in namelist"); 177 return(0); 178 } 179 180 nhead = (struct netinfo *)(void *)&netcb; 181 182 netcb.ni_forw = netcb.ni_prev = nhead; 183 protos = TCP|UDP; 184 return(1); 185 } 186 187 void 188 fetchnetstat(void) 189 { 190 struct netinfo *p; 191 192 if (namelist[X_TCBTABLE].n_value == 0) 193 return; 194 for (p = netcb.ni_forw; p != nhead; p = p->ni_forw) 195 p->ni_seen = 0; 196 197 if ((protos & (TCP | UDP)) == 0) { 198 error("No protocols to display"); 199 return; 200 } 201 if ((protos & TCP) && namelist[X_TCBTABLE].n_type) 202 fetchnetstat4(NPTR(X_TCBTABLE), 1); 203 if ((protos & UDP) && namelist[X_UDBTABLE].n_type) 204 fetchnetstat4(NPTR(X_UDBTABLE), 0); 205 #ifdef INET6 206 if ((protos & TCP) && namelist[X_TCBTABLE].n_type) 207 fetchnetstat6(NPTR(X_TCBTABLE), 1); 208 if ((protos & UDP) && namelist[X_UDBTABLE].n_type) 209 fetchnetstat6(NPTR(X_UDBTABLE), 0); 210 #endif 211 } 212 213 static void 214 fetchnetstat4(void *off, int istcp) 215 { 216 struct inpcbtable pcbtable; 217 struct inpcb *head, *prev, *next; 218 struct netinfo *p; 219 struct inpcb inpcb; 220 struct socket sockb; 221 struct tcpcb tcpcb; 222 223 KREAD(off, &pcbtable, sizeof pcbtable); 224 prev = head = (struct inpcb *)&((struct inpcbtable *)off)->inpt_queue; 225 next = (struct inpcb *)pcbtable.inpt_queue.cqh_first; 226 while (next != head) { 227 KREAD(next, &inpcb, sizeof (inpcb)); 228 if ((struct inpcb *)inpcb.inp_queue.cqe_prev != prev) { 229 for (p = netcb.ni_forw; p != nhead; p = p->ni_forw) 230 p->ni_seen = 1; 231 error("Kernel state in transition"); 232 return; 233 } 234 prev = next; 235 next = (struct inpcb *)inpcb.inp_queue.cqe_next; 236 237 if (inpcb.inp_af != AF_INET) 238 continue; 239 if (!aflag && inet_lnaof(inpcb.inp_laddr) == INADDR_ANY) 240 continue; 241 if (nhosts && !checkhost(&inpcb)) 242 continue; 243 if (nports && !checkport(&inpcb)) 244 continue; 245 KREAD(inpcb.inp_socket, &sockb, sizeof (sockb)); 246 if (istcp) { 247 KREAD(inpcb.inp_ppcb, &tcpcb, sizeof (tcpcb)); 248 enter(&inpcb, &sockb, tcpcb.t_state, "tcp"); 249 } else 250 enter(&inpcb, &sockb, 0, "udp"); 251 } 252 } 253 254 #ifdef INET6 255 static void 256 fetchnetstat6(void *off, int istcp) 257 { 258 struct inpcbtable pcbtable; 259 struct in6pcb *head6, *prev6, *next6; 260 struct netinfo *p; 261 struct socket sockb; 262 struct tcpcb tcpcb; 263 struct in6pcb in6pcb; 264 265 KREAD(off, &pcbtable, sizeof pcbtable); 266 prev6 = head6 = (struct in6pcb *)&((struct inpcbtable *)off)->inpt_queue; 267 next6 = (struct in6pcb *)pcbtable.inpt_queue.cqh_first; 268 while (next6 != head6) { 269 KREAD(next6, &in6pcb, sizeof (in6pcb)); 270 if ((struct in6pcb *)in6pcb.in6p_queue.cqe_prev != prev6) { 271 for (p = netcb.ni_forw; p != nhead; p = p->ni_forw) 272 p->ni_seen = 1; 273 error("Kernel state in transition"); 274 return; 275 } 276 prev6 = next6; 277 next6 = (struct in6pcb *)in6pcb.in6p_queue.cqe_next; 278 279 if (in6pcb.in6p_af != AF_INET6) 280 continue; 281 if (!aflag && IN6_IS_ADDR_UNSPECIFIED(&in6pcb.in6p_laddr)) 282 continue; 283 if (nhosts && !checkhost6(&in6pcb)) 284 continue; 285 if (nports && !checkport6(&in6pcb)) 286 continue; 287 KREAD(in6pcb.in6p_socket, &sockb, sizeof (sockb)); 288 if (istcp) { 289 KREAD(in6pcb.in6p_ppcb, &tcpcb, sizeof (tcpcb)); 290 enter6(&in6pcb, &sockb, tcpcb.t_state, "tcp"); 291 } else 292 enter6(&in6pcb, &sockb, 0, "udp"); 293 } 294 } 295 #endif /*INET6*/ 296 297 static void 298 enter(struct inpcb *inp, struct socket *so, int state, const char *proto) 299 { 300 struct netinfo *p; 301 302 /* 303 * Only take exact matches, any sockets with 304 * previously unbound addresses will be deleted 305 * below in the display routine because they 306 * will appear as ``not seen'' in the kernel 307 * data structures. 308 */ 309 for (p = netcb.ni_forw; p != nhead; p = p->ni_forw) { 310 if (p->ni_family != AF_INET) 311 continue; 312 if (!streq(proto, p->ni_proto)) 313 continue; 314 if (p->ni_lport != inp->inp_lport || 315 p->ni_laddr.s_addr != inp->inp_laddr.s_addr) 316 continue; 317 if (p->ni_faddr.s_addr == inp->inp_faddr.s_addr && 318 p->ni_fport == inp->inp_fport) 319 break; 320 } 321 if (p == nhead) { 322 if ((p = malloc(sizeof(*p))) == NULL) { 323 error("Out of memory"); 324 return; 325 } 326 p->ni_prev = nhead; 327 p->ni_forw = netcb.ni_forw; 328 netcb.ni_forw->ni_prev = p; 329 netcb.ni_forw = p; 330 p->ni_line = -1; 331 p->ni_laddr = inp->inp_laddr; 332 p->ni_lport = inp->inp_lport; 333 p->ni_faddr = inp->inp_faddr; 334 p->ni_fport = inp->inp_fport; 335 p->ni_proto = proto; 336 p->ni_flags = NIF_LACHG | NIF_FACHG; 337 p->ni_family = AF_INET; 338 } 339 p->ni_rcvcc = so->so_rcv.sb_cc; 340 p->ni_sndcc = so->so_snd.sb_cc; 341 p->ni_state = state; 342 p->ni_seen = 1; 343 } 344 345 #ifdef INET6 346 static void 347 enter6(struct in6pcb *in6p, struct socket *so, int state, const char *proto) 348 { 349 struct netinfo *p; 350 351 /* 352 * Only take exact matches, any sockets with 353 * previously unbound addresses will be deleted 354 * below in the display routine because they 355 * will appear as ``not seen'' in the kernel 356 * data structures. 357 */ 358 for (p = netcb.ni_forw; p != nhead; p = p->ni_forw) { 359 if (p->ni_family != AF_INET6) 360 continue; 361 if (!streq(proto, p->ni_proto)) 362 continue; 363 if (p->ni_lport != in6p->in6p_lport || 364 !IN6_ARE_ADDR_EQUAL(&p->ni_laddr6, &in6p->in6p_laddr)) 365 continue; 366 if (IN6_ARE_ADDR_EQUAL(&p->ni_faddr6, &in6p->in6p_faddr) && 367 p->ni_fport == in6p->in6p_fport) 368 break; 369 } 370 if (p == nhead) { 371 if ((p = malloc(sizeof(*p))) == NULL) { 372 error("Out of memory"); 373 return; 374 } 375 p->ni_prev = nhead; 376 p->ni_forw = netcb.ni_forw; 377 netcb.ni_forw->ni_prev = p; 378 netcb.ni_forw = p; 379 p->ni_line = -1; 380 p->ni_laddr6 = in6p->in6p_laddr; 381 p->ni_lport = in6p->in6p_lport; 382 p->ni_faddr6 = in6p->in6p_faddr; 383 p->ni_fport = in6p->in6p_fport; 384 p->ni_proto = proto; 385 p->ni_flags = NIF_LACHG | NIF_FACHG; 386 p->ni_family = AF_INET6; 387 } 388 p->ni_rcvcc = so->so_rcv.sb_cc; 389 p->ni_sndcc = so->so_snd.sb_cc; 390 p->ni_state = state; 391 p->ni_seen = 1; 392 } 393 #endif 394 395 /* column locations */ 396 #define LADDR 0 397 #define FADDR LADDR+23 398 #define PROTO FADDR+23 399 #define RCVCC PROTO+6 400 #define SNDCC RCVCC+7 401 #define STATE SNDCC+7 402 403 void 404 labelnetstat(void) 405 { 406 struct netinfo *p; 407 408 if (namelist[X_TCBTABLE].n_type == 0) 409 return; 410 wmove(wnd, 0, 0); wclrtobot(wnd); 411 mvwaddstr(wnd, 0, LADDR, "Local Address"); 412 mvwaddstr(wnd, 0, FADDR, "Foreign Address"); 413 mvwaddstr(wnd, 0, PROTO, "Proto"); 414 mvwaddstr(wnd, 0, RCVCC, "Recv-Q"); 415 mvwaddstr(wnd, 0, SNDCC, "Send-Q"); 416 mvwaddstr(wnd, 0, STATE, "(state)"); 417 418 for (p = netcb.ni_forw; p != nhead; p = p->ni_forw) { 419 if (p->ni_line == -1) 420 continue; 421 p->ni_flags |= NIF_LACHG | NIF_FACHG; 422 } 423 } 424 425 void 426 shownetstat(void) 427 { 428 struct netinfo *p, *q; 429 430 /* 431 * First, delete any connections that have gone 432 * away and adjust the position of connections 433 * below to reflect the deleted line. 434 */ 435 p = netcb.ni_forw; 436 while (p != nhead) { 437 if (p->ni_line == -1 || p->ni_seen) { 438 p = p->ni_forw; 439 continue; 440 } 441 wmove(wnd, p->ni_line, 0); 442 wdeleteln(wnd); 443 for (q = netcb.ni_forw; q != nhead; q = q->ni_forw) 444 if (q != p && q->ni_line > p->ni_line) { 445 q->ni_line--; 446 /* this shouldn't be necessary */ 447 q->ni_flags |= NIF_LACHG | NIF_FACHG; 448 } 449 lastrow--; 450 q = p->ni_forw; 451 p->ni_prev->ni_forw = p->ni_forw; 452 p->ni_forw->ni_prev = p->ni_prev; 453 free(p); 454 p = q; 455 } 456 /* 457 * Update existing connections and add new ones. 458 */ 459 for (p = netcb.ni_forw; p != nhead; p = p->ni_forw) { 460 if (p->ni_line == -1) { 461 /* 462 * Add a new entry if possible. 463 */ 464 if (lastrow > getmaxy(wnd)) 465 continue; 466 p->ni_line = lastrow++; 467 p->ni_flags |= NIF_LACHG | NIF_FACHG; 468 } 469 if (p->ni_flags & NIF_LACHG) { 470 wmove(wnd, p->ni_line, LADDR); 471 switch (p->ni_family) { 472 case AF_INET: 473 inetprint(&p->ni_laddr, p->ni_lport, 474 p->ni_proto); 475 break; 476 #ifdef INET6 477 case AF_INET6: 478 inet6print(&p->ni_laddr6, p->ni_lport, 479 p->ni_proto); 480 break; 481 #endif 482 } 483 p->ni_flags &= ~NIF_LACHG; 484 } 485 if (p->ni_flags & NIF_FACHG) { 486 wmove(wnd, p->ni_line, FADDR); 487 switch (p->ni_family) { 488 case AF_INET: 489 inetprint(&p->ni_faddr, p->ni_fport, 490 p->ni_proto); 491 break; 492 #ifdef INET6 493 case AF_INET6: 494 inet6print(&p->ni_faddr6, p->ni_fport, 495 p->ni_proto); 496 break; 497 #endif 498 } 499 p->ni_flags &= ~NIF_FACHG; 500 } 501 mvwaddstr(wnd, p->ni_line, PROTO, p->ni_proto); 502 #ifdef INET6 503 if (p->ni_family == AF_INET6) 504 waddstr(wnd, "6"); 505 #endif 506 mvwprintw(wnd, p->ni_line, RCVCC, "%6ld", p->ni_rcvcc); 507 mvwprintw(wnd, p->ni_line, SNDCC, "%6ld", p->ni_sndcc); 508 if (streq(p->ni_proto, "tcp")) { 509 if (p->ni_state < 0 || p->ni_state >= TCP_NSTATES) 510 mvwprintw(wnd, p->ni_line, STATE, "%d", 511 p->ni_state); 512 else 513 mvwaddstr(wnd, p->ni_line, STATE, 514 tcpstates[p->ni_state]); 515 } 516 wclrtoeol(wnd); 517 } 518 if (lastrow < getmaxy(wnd)) { 519 wmove(wnd, lastrow, 0); wclrtobot(wnd); 520 wmove(wnd, getmaxy(wnd), 0); wdeleteln(wnd); /* XXX */ 521 } 522 } 523 524 /* 525 * Pretty print an Internet address (net address + port). 526 * If the nflag was specified, use numbers instead of names. 527 */ 528 static void 529 inetprint(struct in_addr *in, int port, const char *proto) 530 { 531 struct servent *sp = 0; 532 char line[80], *cp; 533 534 (void)snprintf(line, sizeof line, "%.*s.", 16, inetname(*in)); 535 cp = strchr(line, '\0'); 536 if (!nflag && port) 537 sp = getservbyport(port, proto); 538 if (sp || port == 0) 539 (void)snprintf(cp, line + sizeof line - cp, "%.8s", 540 sp ? sp->s_name : "*"); 541 else 542 (void)snprintf(cp, line + sizeof line - cp, "%d", 543 ntohs((u_short)port)); 544 /* pad to full column to clear any garbage */ 545 cp = strchr(line, '\0'); 546 while (cp - line < 22) 547 *cp++ = ' '; 548 *cp = '\0'; 549 waddstr(wnd, line); 550 } 551 552 #ifdef INET6 553 static void 554 inet6print(struct in6_addr *in6, int port, const char *proto) 555 { 556 struct servent *sp = 0; 557 char line[80], *cp; 558 559 (void)snprintf(line, sizeof line, "%.*s.", 16, inet6name(in6)); 560 cp = strchr(line, '\0'); 561 if (!nflag && port) 562 sp = getservbyport(port, proto); 563 if (sp || port == 0) 564 (void)snprintf(cp, line + sizeof line - cp, "%.8s", 565 sp ? sp->s_name : "*"); 566 else 567 (void)snprintf(cp, line + sizeof line - cp, "%d", 568 ntohs((u_short)port)); 569 /* pad to full column to clear any garbage */ 570 cp = strchr(line, '\0'); 571 while (cp - line < 22) 572 *cp++ = ' '; 573 *cp = '\0'; 574 waddstr(wnd, line); 575 } 576 #endif 577 578 /* 579 * Construct an Internet address representation. 580 * If the nflag has been supplied, give 581 * numeric value, otherwise try for symbolic name. 582 */ 583 static const char * 584 inetname(struct in_addr in) 585 { 586 char *cp = 0; 587 static char line[50]; 588 struct hostent *hp; 589 struct netent *np; 590 591 if (!nflag && in.s_addr != INADDR_ANY) { 592 int net = inet_netof(in); 593 int lna = inet_lnaof(in); 594 595 if (lna == INADDR_ANY) { 596 np = getnetbyaddr(net, AF_INET); 597 if (np) 598 cp = np->n_name; 599 } 600 if (cp == 0) { 601 hp = gethostbyaddr((char *)&in, sizeof (in), AF_INET); 602 if (hp) 603 cp = hp->h_name; 604 } 605 } 606 if (in.s_addr == INADDR_ANY) 607 strlcpy(line, "*", sizeof(line)); 608 else if (cp) 609 strlcpy(line, cp, sizeof(line)); 610 else { 611 in.s_addr = ntohl(in.s_addr); 612 #define C(x) ((x) & 0xff) 613 (void)snprintf(line, sizeof line, "%u.%u.%u.%u", 614 C(in.s_addr >> 24), C(in.s_addr >> 16), 615 C(in.s_addr >> 8), C(in.s_addr)); 616 #undef C 617 } 618 return (line); 619 } 620 621 #ifdef INET6 622 static const char * 623 inet6name(struct in6_addr *in6) 624 { 625 static char line[NI_MAXHOST]; 626 struct sockaddr_in6 sin6; 627 int flags; 628 629 if (nflag) 630 flags = NI_NUMERICHOST; 631 else 632 flags = 0; 633 if (IN6_IS_ADDR_UNSPECIFIED(in6)) 634 return "*"; 635 memset(&sin6, 0, sizeof(sin6)); 636 sin6.sin6_family = AF_INET6; 637 sin6.sin6_len = sizeof(struct sockaddr_in6); 638 sin6.sin6_addr = *in6; 639 if (getnameinfo((struct sockaddr *)&sin6, sin6.sin6_len, 640 line, sizeof(line), NULL, 0, flags) == 0) 641 return line; 642 return "?"; 643 } 644 #endif 645 646 /* please note: there are also some netstat commands in netcmds.c */ 647 648 void 649 netstat_all(char *args) 650 { 651 aflag = !aflag; 652 fetchnetstat(); 653 shownetstat(); 654 refresh(); 655 } 656 657 void 658 netstat_names(char *args) 659 { 660 661 if (nflag == 0) 662 return; 663 664 nflag = 0; 665 wclear(wnd); 666 labelnetstat(); 667 shownetstat(); 668 refresh(); 669 } 670 671 void 672 netstat_numbers(char *args) 673 { 674 675 if (nflag != 0) 676 return; 677 678 nflag = 1; 679 wclear(wnd); 680 labelnetstat(); 681 shownetstat(); 682 refresh(); 683 } 684
Indexes created Mon Sep 22 13:09:51 GMT 2025