usr.bin/systat/netstat.c

   1 /*-
   2  * Copyright (c) 1980, 1992, 1993
   3  *      The 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  * 4. Neither the name of the University nor the names of its contributors
  14  *    may be used to endorse or promote products derived from this software
  15  *    without specific prior written permission.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  27  * SUCH DAMAGE.
  28  */
  29
  30 #include <sys/cdefs.h>
  31
  32 __FBSDID("$FreeBSD$");
  33
  34 #ifdef lint
  35 static const char sccsid[] = "@(#)netstat.c     8.1 (Berkeley) 6/6/93";
  36 #endif
  37
  38 /*
  39  * netstat
  40  */
  41 #include <sys/param.h>
  42 #include <sys/queue.h>
  43 #include <sys/socket.h>
  44 #include <sys/socketvar.h>
  45 #include <sys/protosw.h>
  46
  47 #include <netinet/in.h>
  48 #include <arpa/inet.h>
  49 #include <net/route.h>
  50 #include <netinet/in_systm.h>
  51 #include <netinet/ip.h>
  52 #ifdef INET6
  53 #include <netinet/ip6.h>
  54 #endif
  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 #include <netinet/tcp.h>
  60 #include <netinet/tcpip.h>
  61 #include <netinet/tcp_seq.h>
  62 #include <netinet/tcp_var.h>
  63 #define TCPSTATES
  64 #include <netinet/tcp_fsm.h>
  65 #include <netinet/tcp_timer.h>
  66 #include <netinet/tcp_var.h>
  67 #include <netinet/tcp_debug.h>
  68 #include <netinet/udp.h>
  69 #include <netinet/udp_var.h>
  70
  71 #include <netdb.h>
  72 #include <nlist.h>
  73 #include <paths.h>
  74 #include <stdlib.h>
  75 #include <string.h>
  76
  77 #include "systat.h"
  78 #include "extern.h"
  79
  80 static struct netinfo *enter(struct inpcb *, int, const char *);
  81 static void enter_kvm(struct inpcb *, struct socket *, int, const char *);
  82 static void enter_sysctl(struct inpcb *, struct xsocket *, int, const char *);
  83 static void fetchnetstat_kvm(void);
  84 static void fetchnetstat_sysctl(void);
  85 static char *inetname(struct sockaddr *);
  86 static void inetprint(struct sockaddr *, const char *);
  87
  88 #define streq(a,b)      (strcmp(a,b)==0)
  89 #define YMAX(w)         ((w)->_maxy-1)
  90
  91 WINDOW *
  92 opennetstat(void)
  93 {
  94         sethostent(1);
  95         setnetent(1);
  96         return (subwin(stdscr, LINES-3-1, 0, MAINWIN_ROW, 0));
  97 }
  98
  99 struct netinfo {
 100         TAILQ_ENTRY(netinfo) chain;
 101         short   ni_line;                /* line on screen */
 102         short   ni_seen;                /* 0 when not present in list */
 103         short   ni_flags;
 104 #define NIF_LACHG       0x1             /* local address changed */
 105 #define NIF_FACHG       0x2             /* foreign address changed */
 106         short   ni_state;               /* tcp state */
 107         const char      *ni_proto;              /* protocol */
 108         struct sockaddr_storage ni_lsa; /* local address */
 109         struct sockaddr_storage ni_fsa; /* foreign address */
 110         u_int   ni_rcvcc;               /* rcv buffer character count */
 111         u_int   ni_sndcc;               /* snd buffer character count */
 112 };
 113
 114 TAILQ_HEAD(netinfohead, netinfo) netcb = TAILQ_HEAD_INITIALIZER(netcb);
 115
 116 static  int aflag = 0;
 117 static  int nflag = 0;
 118 static  int lastrow = 1;
 119
 120 void
 121 closenetstat(WINDOW *w)
 122 {
 123         struct netinfo *p;
 124
 125         endhostent();
 126         endnetent();
 127         TAILQ_FOREACH(p, &netcb, chain) {
 128                 if (p->ni_line != -1)
 129                         lastrow--;
 130                 p->ni_line = -1;
 131         }
 132         if (w != NULL) {
 133                 wclear(w);
 134                 wrefresh(w);
 135                 delwin(w);
 136         }
 137 }
 138
 139 static const char *miblist[] = {
 140         "net.inet.tcp.pcblist",
 141         "net.inet.udp.pcblist"
 142 };
 143
 144 static char tcb[] = "tcb", udb[] = "udb";
 145
 146 struct nlist namelist[] = {
 147 #define X_TCB   0
 148         { .n_name = tcb },
 149 #define X_UDB   1
 150         { .n_name = udb },
 151         { .n_name = NULL },
 152 };
 153
 154 int
 155 initnetstat(void)
 156 {
 157         protos = TCP|UDP;
 158         return(1);
 159 }
 160
 161 void
 162 fetchnetstat(void)
 163 {
 164         if (use_kvm)
 165                 fetchnetstat_kvm();
 166         else
 167                 fetchnetstat_sysctl();
 168 }
 169
 170 static void
 171 fetchnetstat_kvm(void)
 172 {
 173         struct inpcb *next;
 174         struct netinfo *p;
 175         struct inpcbhead head;
 176         struct inpcb inpcb;
 177         struct socket sockb;
 178         struct tcpcb tcpcb;
 179         void *off;
 180         int istcp;
 181
 182         if (namelist[X_TCB].n_value == 0)
 183                 return;
 184         TAILQ_FOREACH(p, &netcb, chain)
 185                 p->ni_seen = 0;
 186         if (protos&TCP) {
 187                 off = NPTR(X_TCB);
 188                 istcp = 1;
 189         }
 190         else if (protos&UDP) {
 191                 off = NPTR(X_UDB);
 192                 istcp = 0;
 193         }
 194         else {
 195                 error("No protocols to display");
 196                 return;
 197         }
 198 again:
 199         KREAD(off, &head, sizeof (struct inpcbhead));
 200         LIST_FOREACH(next, &head, inp_list) {
 201                 KREAD(next, &inpcb, sizeof (inpcb));
 202                 next = &inpcb;
 203                 if (!aflag) {
 204                         if (inpcb.inp_vflag & INP_IPV4) {
 205                                 if (inet_lnaof(inpcb.inp_laddr) == INADDR_ANY)
 206                                         continue;
 207                         }
 208 #ifdef INET6
 209                         else if (inpcb.inp_vflag & INP_IPV6) {
 210                                 if (memcmp(&inpcb.in6p_laddr,
 211                                     &in6addr_any, sizeof(in6addr_any)) == 0)
 212                                         continue;
 213                         }
 214 #endif
 215                 }
 216                 if (nhosts && !checkhost(&inpcb))
 217                         continue;
 218                 if (nports && !checkport(&inpcb))
 219                         continue;
 220                 if (istcp) {
 221                         if (inpcb.inp_flags & INP_TIMEWAIT) {
 222                                 bzero(&sockb, sizeof(sockb));
 223                                 enter_kvm(&inpcb, &sockb, TCPS_TIME_WAIT,
 224                                          "tcp");
 225                         } else {
 226                                 KREAD(inpcb.inp_socket, &sockb,
 227                                         sizeof (sockb));
 228                                 KREAD(inpcb.inp_ppcb, &tcpcb, sizeof (tcpcb));
 229                                 enter_kvm(&inpcb, &sockb, tcpcb.t_state,
 230                                         "tcp");
 231                         }
 232                 } else
 233                         enter_kvm(&inpcb, &sockb, 0, "udp");
 234         }
 235         if (istcp && (protos&UDP)) {
 236                 istcp = 0;
 237                 off = NPTR(X_UDB);
 238                 goto again;
 239         }
 240 }
 241
 242 static void
 243 fetchnetstat_sysctl(void)
 244 {
 245         struct netinfo *p;
 246         int idx;
 247         struct xinpgen *inpg;
 248         char *cur, *end;
 249         struct inpcb *inpcb;
 250         struct xinpcb *xip = NULL;
 251         struct xtcpcb *xtp = NULL;
 252         int plen;
 253         size_t lsz;
 254
 255         TAILQ_FOREACH(p, &netcb, chain)
 256                 p->ni_seen = 0;
 257         if (protos&TCP) {
 258                 idx = 0;
 259         } else if (protos&UDP) {
 260                 idx = 1;
 261         } else {
 262                 error("No protocols to display");
 263                 return;
 264         }
 265
 266         for (;idx < 2; idx++) {
 267                 if (idx == 1 && !(protos&UDP))
 268                         break;
 269                 inpg = (struct xinpgen *)sysctl_dynread(miblist[idx], &lsz);
 270                 if (inpg == NULL) {
 271                         error("sysctl(%s...) failed", miblist[idx]);
 272                         continue;
 273                 }
 274                 /*
 275                  * We currently do no require a consistent pcb list.
 276                  * Try to be robust in case of struct size changes
 277                  */
 278                 cur = ((char *)inpg) + inpg->xig_len;
 279                 /* There is also a trailing struct xinpgen */
 280                 end = ((char *)inpg) + lsz - inpg->xig_len;
 281                 if (end <= cur) {
 282                         free(inpg);
 283                         continue;
 284                 }
 285                 if (idx == 0) { /* TCP */
 286                         xtp = (struct xtcpcb *)cur;
 287                         plen = xtp->xt_len;
 288                 } else {
 289                         xip = (struct xinpcb *)cur;
 290                         plen = xip->xi_len;
 291                 }
 292                 while (cur + plen <= end) {
 293                         if (idx == 0) { /* TCP */
 294                                 xtp = (struct xtcpcb *)cur;
 295                                 inpcb = &xtp->xt_inp;
 296                         } else {
 297                                 xip = (struct xinpcb *)cur;
 298                                 inpcb = &xip->xi_inp;
 299                         }
 300                         cur += plen;
 301
 302                         if (!aflag) {
 303                                 if (inpcb->inp_vflag & INP_IPV4) {
 304                                         if (inet_lnaof(inpcb->inp_laddr) ==
 305                                             INADDR_ANY)
 306                                                 continue;
 307                                 }
 308 #ifdef INET6
 309                                 else if (inpcb->inp_vflag & INP_IPV6) {
 310                                         if (memcmp(&inpcb->in6p_laddr,
 311                                             &in6addr_any, sizeof(in6addr_any))
 312                                             == 0)
 313                                                 continue;
 314                                 }
 315 #endif
 316                         }
 317                         if (nhosts && !checkhost(inpcb))
 318                                 continue;
 319                         if (nports && !checkport(inpcb))
 320                                 continue;
 321                         if (idx == 0)   /* TCP */
 322                                 enter_sysctl(inpcb, &xtp->xt_socket,
 323                                     xtp->xt_tp.t_state, "tcp");
 324                         else            /* UDP */
 325                                 enter_sysctl(inpcb, &xip->xi_socket, 0, "udp");
 326                 }
 327                 free(inpg);
 328         }
 329 }
 330
 331 static void
 332 enter_kvm(struct inpcb *inp, struct socket *so, int state, const char *proto)
 333 {
 334         struct netinfo *p;
 335
 336         if ((p = enter(inp, state, proto)) != NULL) {
 337                 p->ni_rcvcc = so->so_rcv.sb_cc;
 338                 p->ni_sndcc = so->so_snd.sb_cc;
 339         }
 340 }
 341
 342 static void
 343 enter_sysctl(struct inpcb *inp, struct xsocket *so, int state, const char *proto)
 344 {
 345         struct netinfo *p;
 346
 347         if ((p = enter(inp, state, proto)) != NULL) {
 348                 p->ni_rcvcc = so->so_rcv.sb_cc;
 349                 p->ni_sndcc = so->so_snd.sb_cc;
 350         }
 351 }
 352
 353
 354 static struct netinfo *
 355 enter(struct inpcb *inp, int state, const char *proto)
 356 {
 357         struct netinfo *p;
 358         struct sockaddr_storage lsa, fsa;
 359         struct sockaddr_in *sa4;
 360 #ifdef INET6
 361         struct sockaddr_in6 *sa6;
 362 #endif
 363
 364         memset(&lsa, 0, sizeof(lsa));
 365         memset(&fsa, 0, sizeof(fsa));
 366         if (inp->inp_vflag & INP_IPV4) {
 367                 sa4 = (struct sockaddr_in *)&lsa;
 368                 sa4->sin_addr = inp->inp_laddr;
 369                 sa4->sin_port = inp->inp_lport;
 370                 sa4->sin_family = AF_INET;
 371                 sa4->sin_len = sizeof(struct sockaddr_in);
 372
 373                 sa4 = (struct sockaddr_in *)&fsa;
 374                 sa4->sin_addr = inp->inp_faddr;
 375                 sa4->sin_port = inp->inp_fport;
 376                 sa4->sin_family = AF_INET;
 377                 sa4->sin_len = sizeof(struct sockaddr_in);
 378         }
 379 #ifdef INET6
 380         else if (inp->inp_vflag & INP_IPV6) {
 381                 sa6 = (struct sockaddr_in6 *)&lsa;
 382                 memcpy(&sa6->sin6_addr, &inp->in6p_laddr,
 383                     sizeof(struct in6_addr));
 384                 sa6->sin6_port = inp->inp_lport;
 385                 sa6->sin6_family = AF_INET6;
 386                 sa6->sin6_len = sizeof(struct sockaddr_in6);
 387
 388                 sa6 = (struct sockaddr_in6 *)&fsa;
 389                 memcpy(&sa6->sin6_addr, &inp->in6p_faddr,
 390                     sizeof(struct in6_addr));
 391                 sa6->sin6_port = inp->inp_fport;
 392                 sa6->sin6_family = AF_INET6;
 393                 sa6->sin6_len = sizeof(struct sockaddr_in6);
 394         }
 395 #endif
 396         else
 397                 return NULL;
 398
 399         /*
 400          * Only take exact matches, any sockets with
 401          * previously unbound addresses will be deleted
 402          * below in the display routine because they
 403          * will appear as ``not seen'' in the kernel
 404          * data structures.
 405          */
 406         TAILQ_FOREACH(p, &netcb, chain) {
 407                 if (!streq(proto, p->ni_proto))
 408                         continue;
 409                 if (p->ni_lsa.ss_family != lsa.ss_family ||
 410                     memcmp(&p->ni_lsa, &lsa, lsa.ss_len) != 0)
 411                         continue;
 412                 if (p->ni_fsa.ss_family == fsa.ss_family &&
 413                     memcmp(&p->ni_fsa, &fsa, fsa.ss_len) == 0)
 414                         break;
 415         }
 416         if (p == NULL) {
 417                 if ((p = malloc(sizeof(*p))) == NULL) {
 418                         error("Out of memory");
 419                         return NULL;
 420                 }
 421                 TAILQ_INSERT_HEAD(&netcb, p, chain);
 422                 p->ni_line = -1;
 423                 memcpy(&p->ni_lsa, &lsa, lsa.ss_len);
 424                 memcpy(&p->ni_fsa, &fsa, fsa.ss_len);
 425                 p->ni_proto = strdup(proto);
 426                 p->ni_flags = NIF_LACHG|NIF_FACHG;
 427         }
 428         p->ni_state = state;
 429         p->ni_seen = 1;
 430         return p;
 431 }
 432
 433 /* column locations */
 434 #define LADDR   0
 435 #define FADDR   LADDR+23
 436 #define PROTO   FADDR+23
 437 #define RCVCC   PROTO+6
 438 #define SNDCC   RCVCC+7
 439 #define STATE   SNDCC+7
 440
 441
 442 void
 443 labelnetstat(void)
 444 {
 445         if (use_kvm && namelist[X_TCB].n_type == 0)
 446                 return;
 447         wmove(wnd, 0, 0); wclrtobot(wnd);
 448         mvwaddstr(wnd, 0, LADDR, "Local Address");
 449         mvwaddstr(wnd, 0, FADDR, "Foreign Address");
 450         mvwaddstr(wnd, 0, PROTO, "Proto");
 451         mvwaddstr(wnd, 0, RCVCC, "Recv-Q");
 452         mvwaddstr(wnd, 0, SNDCC, "Send-Q");
 453         mvwaddstr(wnd, 0, STATE, "(state)");
 454 }
 455
 456 void
 457 shownetstat(void)
 458 {
 459         struct netinfo *p, *q;
 460         char proto[6];
 461         const char *family = "";
 462
 463         /*
 464          * First, delete any connections that have gone
 465          * away and adjust the position of connections
 466          * below to reflect the deleted line.
 467          */
 468         p = TAILQ_FIRST(&netcb);
 469         while (p != NULL) {
 470                 if (p->ni_line == -1 || p->ni_seen) {
 471                         p = TAILQ_NEXT(p, chain);
 472                         continue;
 473                 }
 474                 wmove(wnd, p->ni_line, 0); wdeleteln(wnd);
 475                 TAILQ_FOREACH(q, &netcb, chain)
 476                         if (q != p && q->ni_line > p->ni_line) {
 477                                 q->ni_line--;
 478                                 /* this shouldn't be necessary */
 479                                 q->ni_flags |= NIF_LACHG|NIF_FACHG;
 480                         }
 481                 lastrow--;
 482                 q = TAILQ_NEXT(p, chain);
 483                 TAILQ_REMOVE(&netcb, p, chain);
 484                 free(p);
 485                 p = q;
 486         }
 487         /*
 488          * Update existing connections and add new ones.
 489          */
 490         TAILQ_FOREACH(p, &netcb, chain) {
 491                 if (p->ni_line == -1) {
 492                         /*
 493                          * Add a new entry if possible.
 494                          */
 495                         if (lastrow > YMAX(wnd))
 496                                 continue;
 497                         p->ni_line = lastrow++;
 498                         p->ni_flags |= NIF_LACHG|NIF_FACHG;
 499                 }
 500                 if (p->ni_flags & NIF_LACHG) {
 501                         wmove(wnd, p->ni_line, LADDR);
 502                         inetprint((struct sockaddr *)&p->ni_lsa, p->ni_proto);
 503                         p->ni_flags &= ~NIF_LACHG;
 504                 }
 505                 if (p->ni_flags & NIF_FACHG) {
 506                         wmove(wnd, p->ni_line, FADDR);
 507                         inetprint((struct sockaddr *)&p->ni_fsa, p->ni_proto);
 508                         p->ni_flags &= ~NIF_FACHG;
 509                 }
 510 #ifdef INET6
 511                 family = (p->ni_lsa.ss_family == AF_INET) ? "4" : "6";
 512 #endif
 513                 snprintf(proto, sizeof(proto), "%s%s", p->ni_proto, family);
 514                 mvwaddstr(wnd, p->ni_line, PROTO, proto);
 515                 mvwprintw(wnd, p->ni_line, RCVCC, "%6u", p->ni_rcvcc);
 516                 mvwprintw(wnd, p->ni_line, SNDCC, "%6u", p->ni_sndcc);
 517                 if (streq(p->ni_proto, "tcp")) {
 518                         if (p->ni_state < 0 || p->ni_state >= TCP_NSTATES)
 519                                 mvwprintw(wnd, p->ni_line, STATE, "%d",
 520                                     p->ni_state);
 521                         else
 522                                 mvwaddstr(wnd, p->ni_line, STATE,
 523                                     tcpstates[p->ni_state]);
 524                 }
 525                 wclrtoeol(wnd);
 526         }
 527         if (lastrow < YMAX(wnd)) {
 528                 wmove(wnd, lastrow, 0); wclrtobot(wnd);
 529                 wmove(wnd, YMAX(wnd), 0); wdeleteln(wnd);       /* XXX */
 530         }
 531 }
 532
 533 /*
 534  * Pretty print an Internet address (net address + port).
 535  * If the nflag was specified, use numbers instead of names.
 536  */
 537 static void
 538 inetprint(struct sockaddr *sa, const char *proto)
 539 {
 540         struct servent *sp = 0;
 541         char line[80], *cp;
 542         int port;
 543
 544         switch (sa->sa_family) {
 545         case AF_INET:
 546                 port = ((struct sockaddr_in *)sa)->sin_port;
 547                 break;
 548 #ifdef INET6
 549         case AF_INET6:
 550                 port = ((struct sockaddr_in6 *)sa)->sin6_port;
 551                 break;
 552 #endif
 553         default:
 554                 port = 0;
 555                 break;
 556         }
 557         snprintf(line, sizeof(line), "%.*s.", 16, inetname(sa));
 558         cp = index(line, '\0');
 559         if (!nflag && port)
 560                 sp = getservbyport(port, proto);
 561         if (sp || port == 0)
 562                 snprintf(cp, sizeof(line) - (cp - line), "%.8s",
 563                     sp ? sp->s_name : "*");
 564         else
 565                 snprintf(cp, sizeof(line) - (cp - line), "%d",
 566                     ntohs((u_short)port));
 567         /* pad to full column to clear any garbage */
 568         cp = index(line, '\0');
 569         while (cp - line < 22)
 570                 *cp++ = ' ';
 571         line[22] = '\0';
 572         waddstr(wnd, line);
 573 }
 574
 575 /*
 576  * Construct an Internet address representation.
 577  * If the nflag has been supplied, give
 578  * numeric value, otherwise try for symbolic name.
 579  */
 580 static char *
 581 inetname(struct sockaddr *sa)
 582 {
 583         char *cp = 0;
 584         static char line[NI_MAXHOST];
 585         struct hostent *hp;
 586         struct netent *np;
 587         struct in_addr in;
 588
 589 #ifdef INET6
 590         if (sa->sa_family == AF_INET6) {
 591                 if (memcmp(&((struct sockaddr_in6 *)sa)->sin6_addr,
 592                     &in6addr_any, sizeof(in6addr_any)) == 0)
 593                         strcpy(line, "*");
 594                 else
 595                         getnameinfo(sa, sa->sa_len, line, sizeof(line), NULL, 0,
 596                             nflag ? NI_NUMERICHOST : 0);
 597                 return (line);
 598         }
 599 #endif
 600
 601         in = ((struct sockaddr_in *)sa)->sin_addr;
 602         if (!nflag && in.s_addr != INADDR_ANY) {
 603                 int net = inet_netof(in);
 604                 int lna = inet_lnaof(in);
 605
 606                 if (lna == INADDR_ANY) {
 607                         np = getnetbyaddr(net, AF_INET);
 608                         if (np)
 609                                 cp = np->n_name;
 610                 }
 611                 if (cp == 0) {
 612                         hp = gethostbyaddr((char *)&in, sizeof (in), AF_INET);
 613                         if (hp)
 614                                 cp = hp->h_name;
 615                 }
 616         }
 617         if (in.s_addr == INADDR_ANY)
 618                 strcpy(line, "*");
 619         else if (cp)
 620                 snprintf(line, sizeof(line), "%s", cp);
 621         else {
 622                 in.s_addr = ntohl(in.s_addr);
 623 #define C(x)    ((x) & 0xff)
 624                 snprintf(line, sizeof(line), "%u.%u.%u.%u", C(in.s_addr >> 24),
 625                         C(in.s_addr >> 16), C(in.s_addr >> 8), C(in.s_addr));
 626         }
 627         return (line);
 628 }
 629
 630 int
 631 cmdnetstat(const char *cmd, const char *args)
 632 {
 633         if (prefix(cmd, "all")) {
 634                 aflag = !aflag;
 635                 goto fixup;
 636         }
 637         if  (prefix(cmd, "numbers") || prefix(cmd, "names")) {
 638                 struct netinfo *p;
 639                 int new;
 640
 641                 new = prefix(cmd, "numbers");
 642                 if (new == nflag)
 643                         return (1);
 644                 TAILQ_FOREACH(p, &netcb, chain) {
 645                         if (p->ni_line == -1)
 646                                 continue;
 647                         p->ni_flags |= NIF_LACHG|NIF_FACHG;
 648                 }
 649                 nflag = new;
 650                 goto redisplay;
 651         }
 652         if (!netcmd(cmd, args))
 653                 return (0);
 654 fixup:
 655         fetchnetstat();
 656 redisplay:
 657         shownetstat();
 658         refresh();
 659         return (1);
 660 }