usr.bin/systat/netstat.c

   1 /*-
   2  * SPDX-License-Identifier: BSD-3-Clause
   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
  34 __FBSDID("$FreeBSD$");
  35
  36 #ifdef lint
  37 static const char sccsid[] = "@(#)netstat.c     8.1 (Berkeley) 6/6/93";
  38 #endif
  39
  40 /*
  41  * netstat
  42  */
  43 #include <sys/param.h>
  44 #include <sys/queue.h>
  45 #include <sys/socket.h>
  46 #define _WANT_SOCKET
  47 #include <sys/socketvar.h>
  48 #include <sys/protosw.h>
  49
  50 #include <netinet/in.h>
  51 #include <arpa/inet.h>
  52 #include <net/route.h>
  53 #include <netinet/in_systm.h>
  54 #include <netinet/ip.h>
  55 #ifdef INET6
  56 #include <netinet/ip6.h>
  57 #endif
  58 #define _WANT_INPCB
  59 #include <netinet/in_pcb.h>
  60 #include <netinet/ip_icmp.h>
  61 #include <netinet/icmp_var.h>
  62 #include <netinet/ip_var.h>
  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 #define _WANT_TCPCB
  70 #include <netinet/tcp_var.h>
  71 #include <netinet/tcp_debug.h>
  72 #include <netinet/udp.h>
  73 #include <netinet/udp_var.h>
  74
  75 #include <netdb.h>
  76 #include <nlist.h>
  77 #include <paths.h>
  78 #include <stdlib.h>
  79 #include <string.h>
  80
  81 #include "systat.h"
  82 #include "extern.h"
  83
  84 static struct netinfo *enter(struct in_conninfo *, uint8_t, int, const char *);
  85 static void enter_kvm(struct inpcb *, struct socket *, int, const char *);
  86 static void enter_sysctl(struct xinpcb *, struct xsocket *, int, const char *);
  87 static void fetchnetstat_kvm(void);
  88 static void fetchnetstat_sysctl(void);
  89 static char *inetname(struct sockaddr *);
  90 static void inetprint(struct sockaddr *, const char *);
  91
  92 #define streq(a,b)      (strcmp(a,b)==0)
  93 #define YMAX(w)         (getmaxy(w)-2)
  94
  95 WINDOW *
  96 opennetstat(void)
  97 {
  98         sethostent(1);
  99         setnetent(1);
 100         return (subwin(stdscr, LINES-3-1, 0, MAINWIN_ROW, 0));
 101 }
 102
 103 struct netinfo {
 104         TAILQ_ENTRY(netinfo) chain;
 105         short   ni_line;                /* line on screen */
 106         short   ni_seen;                /* 0 when not present in list */
 107         short   ni_flags;
 108 #define NIF_LACHG       0x1             /* local address changed */
 109 #define NIF_FACHG       0x2             /* foreign address changed */
 110         short   ni_state;               /* tcp state */
 111         const char      *ni_proto;              /* protocol */
 112         struct sockaddr_storage ni_lsa; /* local address */
 113         struct sockaddr_storage ni_fsa; /* foreign address */
 114         u_int   ni_rcvcc;               /* rcv buffer character count */
 115         u_int   ni_sndcc;               /* snd buffer character count */
 116 };
 117
 118 TAILQ_HEAD(netinfohead, netinfo) netcb = TAILQ_HEAD_INITIALIZER(netcb);
 119
 120 static  int aflag = 0;
 121 static  int nflag = 0;
 122 static  int lastrow = 1;
 123
 124 void
 125 closenetstat(WINDOW *w)
 126 {
 127         struct netinfo *p;
 128
 129         endhostent();
 130         endnetent();
 131         TAILQ_FOREACH(p, &netcb, chain) {
 132                 if (p->ni_line != -1)
 133                         lastrow--;
 134                 p->ni_line = -1;
 135         }
 136         if (w != NULL) {
 137                 wclear(w);
 138                 wrefresh(w);
 139                 delwin(w);
 140         }
 141 }
 142
 143 static const char *miblist[] = {
 144         "net.inet.tcp.pcblist",
 145         "net.inet.udp.pcblist"
 146 };
 147
 148 static char tcb[] = "tcb", udb[] = "udb";
 149
 150 struct nlist namelist[] = {
 151 #define X_TCB   0
 152         { .n_name = tcb },
 153 #define X_UDB   1
 154         { .n_name = udb },
 155         { .n_name = NULL },
 156 };
 157
 158 int
 159 initnetstat(void)
 160 {
 161         protos = TCP|UDP;
 162         return(1);
 163 }
 164
 165 void
 166 fetchnetstat(void)
 167 {
 168         if (use_kvm)
 169                 fetchnetstat_kvm();
 170         else
 171                 fetchnetstat_sysctl();
 172 }
 173
 174 static void
 175 fetchnetstat_kvm(void)
 176 {
 177         struct inpcb *next;
 178         struct netinfo *p;
 179         struct inpcbhead head;
 180         struct inpcb inpcb;
 181         struct socket sockb;
 182         struct tcpcb tcpcb;
 183         void *off;
 184         int istcp;
 185
 186         if (namelist[X_TCB].n_value == 0)
 187                 return;
 188         TAILQ_FOREACH(p, &netcb, chain)
 189                 p->ni_seen = 0;
 190         if (protos&TCP) {
 191                 off = NPTR(X_TCB);
 192                 istcp = 1;
 193         }
 194         else if (protos&UDP) {
 195                 off = NPTR(X_UDB);
 196                 istcp = 0;
 197         }
 198         else {
 199                 error("No protocols to display");
 200                 return;
 201         }
 202 again:
 203         KREAD(off, &head, sizeof (struct inpcbhead));
 204         LIST_FOREACH(next, &head, inp_list) {
 205                 KREAD(next, &inpcb, sizeof (inpcb));
 206                 next = &inpcb;
 207                 if (!aflag) {
 208                         if (inpcb.inp_vflag & INP_IPV4) {
 209                                 if (inet_lnaof(inpcb.inp_laddr) == INADDR_ANY)
 210                                         continue;
 211                         }
 212 #ifdef INET6
 213                         else if (inpcb.inp_vflag & INP_IPV6) {
 214                                 if (memcmp(&inpcb.in6p_laddr,
 215                                     &in6addr_any, sizeof(in6addr_any)) == 0)
 216                                         continue;
 217                         }
 218 #endif
 219                 }
 220                 if (nhosts && !checkhost(&inpcb.inp_inc))
 221                         continue;
 222                 if (nports && !checkport(&inpcb.inp_inc))
 223                         continue;
 224                 if (istcp) {
 225                         if (inpcb.inp_flags & INP_TIMEWAIT) {
 226                                 bzero(&sockb, sizeof(sockb));
 227                                 enter_kvm(&inpcb, &sockb, TCPS_TIME_WAIT,
 228                                          "tcp");
 229                         } else {
 230                                 KREAD(inpcb.inp_socket, &sockb,
 231                                         sizeof (sockb));
 232                                 KREAD(inpcb.inp_ppcb, &tcpcb, sizeof (tcpcb));
 233                                 enter_kvm(&inpcb, &sockb, tcpcb.t_state,
 234                                         "tcp");
 235                         }
 236                 } else
 237                         enter_kvm(&inpcb, &sockb, 0, "udp");
 238         }
 239         if (istcp && (protos&UDP)) {
 240                 istcp = 0;
 241                 off = NPTR(X_UDB);
 242                 goto again;
 243         }
 244 }
 245
 246 static void
 247 fetchnetstat_sysctl(void)
 248 {
 249         struct netinfo *p;
 250         int idx;
 251         struct xinpgen *inpg;
 252         char *cur, *end;
 253         struct xinpcb *xip = NULL;
 254         struct xtcpcb *xtp = NULL;
 255         int plen;
 256         size_t lsz;
 257
 258         TAILQ_FOREACH(p, &netcb, chain)
 259                 p->ni_seen = 0;
 260         if (protos&TCP) {
 261                 idx = 0;
 262         } else if (protos&UDP) {
 263                 idx = 1;
 264         } else {
 265                 error("No protocols to display");
 266                 return;
 267         }
 268
 269         for (;idx < 2; idx++) {
 270                 if (idx == 1 && !(protos&UDP))
 271                         break;
 272                 inpg = (struct xinpgen *)sysctl_dynread(miblist[idx], &lsz);
 273                 if (inpg == NULL) {
 274                         error("sysctl(%s...) failed", miblist[idx]);
 275                         continue;
 276                 }
 277                 /*
 278                  * We currently do no require a consistent pcb list.
 279                  * Try to be robust in case of struct size changes
 280                  */
 281                 cur = ((char *)inpg) + inpg->xig_len;
 282                 /* There is also a trailing struct xinpgen */
 283                 end = ((char *)inpg) + lsz - inpg->xig_len;
 284                 if (end <= cur) {
 285                         free(inpg);
 286                         continue;
 287                 }
 288                 if (idx == 0) { /* TCP */
 289                         xtp = (struct xtcpcb *)cur;
 290                         plen = xtp->xt_len;
 291                 } else {
 292                         xip = (struct xinpcb *)cur;
 293                         plen = xip->xi_len;
 294                 }
 295                 while (cur + plen <= end) {
 296                         if (idx == 0) { /* TCP */
 297                                 xtp = (struct xtcpcb *)cur;
 298                                 xip = &xtp->xt_inp;
 299                         } else {
 300                                 xip = (struct xinpcb *)cur;
 301                         }
 302                         cur += plen;
 303
 304                         if (!aflag) {
 305                                 if (xip->inp_vflag & INP_IPV4) {
 306                                         if (inet_lnaof(xip->inp_laddr) ==
 307                                             INADDR_ANY)
 308                                                 continue;
 309                                 }
 310 #ifdef INET6
 311                                 else if (xip->inp_vflag & INP_IPV6) {
 312                                         if (memcmp(&xip->in6p_laddr,
 313                                             &in6addr_any, sizeof(in6addr_any))
 314                                             == 0)
 315                                                 continue;
 316                                 }
 317 #endif
 318                         }
 319                         if (nhosts && !checkhost(&xip->inp_inc))
 320                                 continue;
 321                         if (nports && !checkport(&xip->inp_inc))
 322                                 continue;
 323                         if (idx == 0)
 324                                 enter_sysctl(xip, &xip->xi_socket,
 325                                     xtp->t_state, "tcp");
 326                         else
 327                                 enter_sysctl(xip, &xip->xi_socket, 0, "udp");
 328                 }
 329                 free(inpg);
 330         }
 331 }
 332
 333 static void
 334 enter_kvm(struct inpcb *inp, struct socket *so, int state, const char *proto)
 335 {
 336         struct netinfo *p;
 337
 338         if ((p = enter(&inp->inp_inc, inp->inp_vflag, state, proto)) != NULL) {
 339                 p->ni_rcvcc = so->so_rcv.sb_ccc;
 340                 p->ni_sndcc = so->so_snd.sb_ccc;
 341         }
 342 }
 343
 344 static void
 345 enter_sysctl(struct xinpcb *xip, struct xsocket *so, int state,
 346     const char *proto)
 347 {
 348         struct netinfo *p;
 349
 350         if ((p = enter(&xip->inp_inc, xip->inp_vflag, state, proto)) != NULL) {
 351                 p->ni_rcvcc = so->so_rcv.sb_cc;
 352                 p->ni_sndcc = so->so_snd.sb_cc;
 353         }
 354 }
 355
 356 static struct netinfo *
 357 enter(struct in_conninfo *inc, uint8_t vflag, int state, const char *proto)
 358 {
 359         struct netinfo *p;
 360         struct sockaddr_storage lsa, fsa;
 361         struct sockaddr_in *sa4;
 362 #ifdef INET6
 363         struct sockaddr_in6 *sa6;
 364 #endif
 365
 366         memset(&lsa, 0, sizeof(lsa));
 367         memset(&fsa, 0, sizeof(fsa));
 368         if (vflag & INP_IPV4) {
 369                 sa4 = (struct sockaddr_in *)&lsa;
 370                 sa4->sin_addr = inc->inc_laddr;
 371                 sa4->sin_port = inc->inc_lport;
 372                 sa4->sin_family = AF_INET;
 373                 sa4->sin_len = sizeof(struct sockaddr_in);
 374
 375                 sa4 = (struct sockaddr_in *)&fsa;
 376                 sa4->sin_addr = inc->inc_faddr;
 377                 sa4->sin_port = inc->inc_fport;
 378                 sa4->sin_family = AF_INET;
 379                 sa4->sin_len = sizeof(struct sockaddr_in);
 380         }
 381 #ifdef INET6
 382         else if (vflag & INP_IPV6) {
 383                 sa6 = (struct sockaddr_in6 *)&lsa;
 384                 memcpy(&sa6->sin6_addr, &inc->inc6_laddr,
 385                     sizeof(struct in6_addr));
 386                 sa6->sin6_port = inc->inc_lport;
 387                 sa6->sin6_family = AF_INET6;
 388                 sa6->sin6_len = sizeof(struct sockaddr_in6);
 389
 390                 sa6 = (struct sockaddr_in6 *)&fsa;
 391                 memcpy(&sa6->sin6_addr, &inc->inc6_faddr,
 392                     sizeof(struct in6_addr));
 393                 sa6->sin6_port = inc->inc_fport;
 394                 sa6->sin6_family = AF_INET6;
 395                 sa6->sin6_len = sizeof(struct sockaddr_in6);
 396         }
 397 #endif
 398         else
 399                 return NULL;
 400
 401         /*
 402          * Only take exact matches, any sockets with
 403          * previously unbound addresses will be deleted
 404          * below in the display routine because they
 405          * will appear as ``not seen'' in the kernel
 406          * data structures.
 407          */
 408         TAILQ_FOREACH(p, &netcb, chain) {
 409                 if (!streq(proto, p->ni_proto))
 410                         continue;
 411                 if (p->ni_lsa.ss_family != lsa.ss_family ||
 412                     memcmp(&p->ni_lsa, &lsa, lsa.ss_len) != 0)
 413                         continue;
 414                 if (p->ni_fsa.ss_family == fsa.ss_family &&
 415                     memcmp(&p->ni_fsa, &fsa, fsa.ss_len) == 0)
 416                         break;
 417         }
 418         if (p == NULL) {
 419                 if ((p = malloc(sizeof(*p))) == NULL) {
 420                         error("Out of memory");
 421                         return NULL;
 422                 }
 423                 TAILQ_INSERT_HEAD(&netcb, p, chain);
 424                 p->ni_line = -1;
 425                 memcpy(&p->ni_lsa, &lsa, lsa.ss_len);
 426                 memcpy(&p->ni_fsa, &fsa, fsa.ss_len);
 427                 p->ni_proto = strdup(proto);
 428                 p->ni_flags = NIF_LACHG|NIF_FACHG;
 429         }
 430         p->ni_state = state;
 431         p->ni_seen = 1;
 432         return p;
 433 }
 434
 435 /* column locations */
 436 #define LADDR   0
 437 #define FADDR   LADDR+23
 438 #define PROTO   FADDR+23
 439 #define RCVCC   PROTO+6
 440 #define SNDCC   RCVCC+7
 441 #define STATE   SNDCC+7
 442
 443 void
 444 labelnetstat(void)
 445 {
 446         if (use_kvm && namelist[X_TCB].n_type == 0)
 447                 return;
 448         wmove(wnd, 0, 0); wclrtobot(wnd);
 449         mvwaddstr(wnd, 0, LADDR, "Local Address");
 450         mvwaddstr(wnd, 0, FADDR, "Foreign Address");
 451         mvwaddstr(wnd, 0, PROTO, "Proto");
 452         mvwaddstr(wnd, 0, RCVCC, "Recv-Q");
 453         mvwaddstr(wnd, 0, SNDCC, "Send-Q");
 454         mvwaddstr(wnd, 0, STATE, "(state)");
 455 }
 456
 457 void
 458 shownetstat(void)
 459 {
 460         struct netinfo *p, *q;
 461         char proto[6];
 462         const char *family = "";
 463
 464         /*
 465          * First, delete any connections that have gone
 466          * away and adjust the position of connections
 467          * below to reflect the deleted line.
 468          */
 469         p = TAILQ_FIRST(&netcb);
 470         while (p != NULL) {
 471                 if (p->ni_line == -1 || p->ni_seen) {
 472                         p = TAILQ_NEXT(p, chain);
 473                         continue;
 474                 }
 475                 wmove(wnd, p->ni_line, 0); wdeleteln(wnd);
 476                 TAILQ_FOREACH(q, &netcb, chain)
 477                         if (q != p && q->ni_line > p->ni_line) {
 478                                 q->ni_line--;
 479                                 /* this shouldn't be necessary */
 480                                 q->ni_flags |= NIF_LACHG|NIF_FACHG;
 481                         }
 482                 lastrow--;
 483                 q = TAILQ_NEXT(p, chain);
 484                 TAILQ_REMOVE(&netcb, p, chain);
 485                 free(p);
 486                 p = q;
 487         }
 488         /*
 489          * Update existing connections and add new ones.
 490          */
 491         TAILQ_FOREACH(p, &netcb, chain) {
 492                 if (p->ni_line == -1) {
 493                         /*
 494                          * Add a new entry if possible.
 495                          */
 496                         if (lastrow > YMAX(wnd))
 497                                 continue;
 498                         p->ni_line = lastrow++;
 499                         p->ni_flags |= NIF_LACHG|NIF_FACHG;
 500                 }
 501                 if (p->ni_flags & NIF_LACHG) {
 502                         wmove(wnd, p->ni_line, LADDR);
 503                         inetprint((struct sockaddr *)&p->ni_lsa, p->ni_proto);
 504                         p->ni_flags &= ~NIF_LACHG;
 505                 }
 506                 if (p->ni_flags & NIF_FACHG) {
 507                         wmove(wnd, p->ni_line, FADDR);
 508                         inetprint((struct sockaddr *)&p->ni_fsa, p->ni_proto);
 509                         p->ni_flags &= ~NIF_FACHG;
 510                 }
 511 #ifdef INET6
 512                 family = (p->ni_lsa.ss_family == AF_INET) ? "4" : "6";
 513 #endif
 514                 snprintf(proto, sizeof(proto), "%s%s", p->ni_proto, family);
 515                 mvwaddstr(wnd, p->ni_line, PROTO, proto);
 516                 mvwprintw(wnd, p->ni_line, RCVCC, "%6u", p->ni_rcvcc);
 517                 mvwprintw(wnd, p->ni_line, SNDCC, "%6u", p->ni_sndcc);
 518                 if (streq(p->ni_proto, "tcp")) {
 519                         if (p->ni_state < 0 || p->ni_state >= TCP_NSTATES)
 520                                 mvwprintw(wnd, p->ni_line, STATE, "%d",
 521                                     p->ni_state);
 522                         else
 523                                 mvwaddstr(wnd, p->ni_line, STATE,
 524                                     tcpstates[p->ni_state]);
 525                 }
 526                 wclrtoeol(wnd);
 527         }
 528         if (lastrow < YMAX(wnd)) {
 529                 wmove(wnd, lastrow, 0); wclrtobot(wnd);
 530                 wmove(wnd, YMAX(wnd), 0); wdeleteln(wnd);       /* XXX */
 531         }
 532 }
 533
 534 /*
 535  * Pretty print an Internet address (net address + port).
 536  * If the nflag was specified, use numbers instead of names.
 537  */
 538 static void
 539 inetprint(struct sockaddr *sa, const char *proto)
 540 {
 541         struct servent *sp = 0;
 542         char line[80], *cp;
 543         int port;
 544
 545         switch (sa->sa_family) {
 546         case AF_INET:
 547                 port = ((struct sockaddr_in *)sa)->sin_port;
 548                 break;
 549 #ifdef INET6
 550         case AF_INET6:
 551                 port = ((struct sockaddr_in6 *)sa)->sin6_port;
 552                 break;
 553 #endif
 554         default:
 555                 port = 0;
 556                 break;
 557         }
 558         snprintf(line, sizeof(line), "%.*s.", 16, inetname(sa));
 559         cp = strchr(line, '\0');
 560         if (!nflag && port)
 561                 sp = getservbyport(port, proto);
 562         if (sp || port == 0)
 563                 snprintf(cp, sizeof(line) - (cp - line), "%.8s",
 564                     sp ? sp->s_name : "*");
 565         else
 566                 snprintf(cp, sizeof(line) - (cp - line), "%d",
 567                     ntohs((u_short)port));
 568         /* pad to full column to clear any garbage */
 569         cp = strchr(line, '\0');
 570         while (cp - line < 22)
 571                 *cp++ = ' ';
 572         line[22] = '\0';
 573         waddstr(wnd, line);
 574 }
 575
 576 /*
 577  * Construct an Internet address representation.
 578  * If the nflag has been supplied, give
 579  * numeric value, otherwise try for symbolic name.
 580  */
 581 static char *
 582 inetname(struct sockaddr *sa)
 583 {
 584         char *cp = 0;
 585         static char line[NI_MAXHOST];
 586         struct hostent *hp;
 587         struct netent *np;
 588         struct in_addr in;
 589
 590 #ifdef INET6
 591         if (sa->sa_family == AF_INET6) {
 592                 if (memcmp(&((struct sockaddr_in6 *)sa)->sin6_addr,
 593                     &in6addr_any, sizeof(in6addr_any)) == 0)
 594                         strcpy(line, "*");
 595                 else
 596                         getnameinfo(sa, sa->sa_len, line, sizeof(line), NULL, 0,
 597                             nflag ? NI_NUMERICHOST : 0);
 598                 return (line);
 599         }
 600 #endif
 601
 602         in = ((struct sockaddr_in *)sa)->sin_addr;
 603         if (!nflag && in.s_addr != INADDR_ANY) {
 604                 int net = inet_netof(in);
 605                 int lna = inet_lnaof(in);
 606
 607                 if (lna == INADDR_ANY) {
 608                         np = getnetbyaddr(net, AF_INET);
 609                         if (np)
 610                                 cp = np->n_name;
 611                 }
 612                 if (cp == NULL) {
 613                         hp = gethostbyaddr((char *)&in, sizeof (in), AF_INET);
 614                         if (hp)
 615                                 cp = hp->h_name;
 616                 }
 617         }
 618         if (in.s_addr == INADDR_ANY)
 619                 strcpy(line, "*");
 620         else if (cp)
 621                 snprintf(line, sizeof(line), "%s", cp);
 622         else {
 623                 in.s_addr = ntohl(in.s_addr);
 624 #define C(x)    ((x) & 0xff)
 625                 snprintf(line, sizeof(line), "%u.%u.%u.%u", C(in.s_addr >> 24),
 626                         C(in.s_addr >> 16), C(in.s_addr >> 8), C(in.s_addr));
 627         }
 628         return (line);
 629 }
 630
 631 int
 632 cmdnetstat(const char *cmd, const char *args)
 633 {
 634         if (prefix(cmd, "all")) {
 635                 aflag = !aflag;
 636                 goto fixup;
 637         }
 638         if  (prefix(cmd, "numbers") || prefix(cmd, "names")) {
 639                 struct netinfo *p;
 640                 int new;
 641
 642                 new = prefix(cmd, "numbers");
 643                 if (new == nflag)
 644                         return (1);
 645                 TAILQ_FOREACH(p, &netcb, chain) {
 646                         if (p->ni_line == -1)
 647                                 continue;
 648                         p->ni_flags |= NIF_LACHG|NIF_FACHG;
 649                 }
 650                 nflag = new;
 651                 goto redisplay;
 652         }
 653         if (!netcmd(cmd, args))
 654                 return (0);
 655 fixup:
 656         fetchnetstat();
 657 redisplay:
 658         shownetstat();
 659         refresh();
 660         return (1);
 661 }