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  * 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
  34 #include <sys/cdefs.h>
  35
  36 __FBSDID("$FreeBSD$");
  37
  38 #ifdef lint
  39 static const char sccsid[] = "@(#)netstat.c     8.1 (Berkeley) 6/6/93";
  40 #endif
  41
  42 /*
  43  * netstat
  44  */
  45 #include <sys/param.h>
  46 #include <sys/queue.h>
  47 #include <sys/socket.h>
  48 #include <sys/socketvar.h>
  49 #include <sys/protosw.h>
  50
  51 #include <netinet/in.h>
  52 #include <arpa/inet.h>
  53 #include <net/route.h>
  54 #include <netinet/in_systm.h>
  55 #include <netinet/ip.h>
  56 #ifdef INET6
  57 #include <netinet/ip6.h>
  58 #endif
  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 #include <netinet/tcp_var.h>
  67 #define TCPSTATES
  68 #include <netinet/tcp_fsm.h>
  69 #include <netinet/tcp_timer.h>
  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 inpcb *, int, const char *);
  85 static void enter_kvm(struct inpcb *, struct socket *, int, const char *);
  86 static void enter_sysctl(struct inpcb *, 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)         ((w)->_maxy-1)
  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))
 221                         continue;
 222                 if (nports && !checkport(&inpcb))
 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 inpcb *inpcb;
 254         struct xinpcb *xip = NULL;
 255         struct xtcpcb *xtp = NULL;
 256         int plen;
 257         size_t lsz;
 258
 259         TAILQ_FOREACH(p, &netcb, chain)
 260                 p->ni_seen = 0;
 261         if (protos&TCP) {
 262                 idx = 0;
 263         } else if (protos&UDP) {
 264                 idx = 1;
 265         } else {
 266                 error("No protocols to display");
 267                 return;
 268         }
 269
 270         for (;idx < 2; idx++) {
 271                 if (idx == 1 && !(protos&UDP))
 272                         break;
 273                 inpg = (struct xinpgen *)sysctl_dynread(miblist[idx], &lsz);
 274                 if (inpg == NULL) {
 275                         error("sysctl(%s...) failed", miblist[idx]);
 276                         continue;
 277                 }
 278                 /*
 279                  * We currently do no require a consistent pcb list.
 280                  * Try to be robust in case of struct size changes
 281                  */
 282                 cur = ((char *)inpg) + inpg->xig_len;
 283                 /* There is also a trailing struct xinpgen */
 284                 end = ((char *)inpg) + lsz - inpg->xig_len;
 285                 if (end <= cur) {
 286                         free(inpg);
 287                         continue;
 288                 }
 289                 if (idx == 0) { /* TCP */
 290                         xtp = (struct xtcpcb *)cur;
 291                         plen = xtp->xt_len;
 292                 } else {
 293                         xip = (struct xinpcb *)cur;
 294                         plen = xip->xi_len;
 295                 }
 296                 while (cur + plen <= end) {
 297                         if (idx == 0) { /* TCP */
 298                                 xtp = (struct xtcpcb *)cur;
 299                                 inpcb = &xtp->xt_inp;
 300                         } else {
 301                                 xip = (struct xinpcb *)cur;
 302                                 inpcb = &xip->xi_inp;
 303                         }
 304                         cur += plen;
 305
 306                         if (!aflag) {
 307                                 if (inpcb->inp_vflag & INP_IPV4) {
 308                                         if (inet_lnaof(inpcb->inp_laddr) ==
 309                                             INADDR_ANY)
 310                                                 continue;
 311                                 }
 312 #ifdef INET6
 313                                 else if (inpcb->inp_vflag & INP_IPV6) {
 314                                         if (memcmp(&inpcb->in6p_laddr,
 315                                             &in6addr_any, sizeof(in6addr_any))
 316                                             == 0)
 317                                                 continue;
 318                                 }
 319 #endif
 320                         }
 321                         if (nhosts && !checkhost(inpcb))
 322                                 continue;
 323                         if (nports && !checkport(inpcb))
 324                                 continue;
 325                         if (idx == 0)   /* TCP */
 326                                 enter_sysctl(inpcb, &xtp->xt_socket,
 327                                     xtp->xt_tp.t_state, "tcp");
 328                         else            /* UDP */
 329                                 enter_sysctl(inpcb, &xip->xi_socket, 0, "udp");
 330                 }
 331                 free(inpg);
 332         }
 333 }
 334
 335 static void
 336 enter_kvm(struct inpcb *inp, struct socket *so, int state, const char *proto)
 337 {
 338         struct netinfo *p;
 339
 340         if ((p = enter(inp, state, proto)) != NULL) {
 341                 p->ni_rcvcc = so->so_rcv.sb_cc;
 342                 p->ni_sndcc = so->so_snd.sb_cc;
 343         }
 344 }
 345
 346 static void
 347 enter_sysctl(struct inpcb *inp, struct xsocket *so, int state, const char *proto)
 348 {
 349         struct netinfo *p;
 350
 351         if ((p = enter(inp, state, proto)) != NULL) {
 352                 p->ni_rcvcc = so->so_rcv.sb_cc;
 353                 p->ni_sndcc = so->so_snd.sb_cc;
 354         }
 355 }
 356
 357
 358 static struct netinfo *
 359 enter(struct inpcb *inp, int state, const char *proto)
 360 {
 361         struct netinfo *p;
 362         struct sockaddr_storage lsa, fsa;
 363         struct sockaddr_in *sa4;
 364 #ifdef INET6
 365         struct sockaddr_in6 *sa6;
 366 #endif
 367
 368         memset(&lsa, 0, sizeof(lsa));
 369         memset(&fsa, 0, sizeof(fsa));
 370         if (inp->inp_vflag & INP_IPV4) {
 371                 sa4 = (struct sockaddr_in *)&lsa;
 372                 sa4->sin_addr = inp->inp_laddr;
 373                 sa4->sin_port = inp->inp_lport;
 374                 sa4->sin_family = AF_INET;
 375                 sa4->sin_len = sizeof(struct sockaddr_in);
 376
 377                 sa4 = (struct sockaddr_in *)&fsa;
 378                 sa4->sin_addr = inp->inp_faddr;
 379                 sa4->sin_port = inp->inp_fport;
 380                 sa4->sin_family = AF_INET;
 381                 sa4->sin_len = sizeof(struct sockaddr_in);
 382         }
 383 #ifdef INET6
 384         else if (inp->inp_vflag & INP_IPV6) {
 385                 sa6 = (struct sockaddr_in6 *)&lsa;
 386                 memcpy(&sa6->sin6_addr, &inp->in6p_laddr,
 387                     sizeof(struct in6_addr));
 388                 sa6->sin6_port = inp->inp_lport;
 389                 sa6->sin6_family = AF_INET6;
 390                 sa6->sin6_len = sizeof(struct sockaddr_in6);
 391
 392                 sa6 = (struct sockaddr_in6 *)&fsa;
 393                 memcpy(&sa6->sin6_addr, &inp->in6p_faddr,
 394                     sizeof(struct in6_addr));
 395                 sa6->sin6_port = inp->inp_fport;
 396                 sa6->sin6_family = AF_INET6;
 397                 sa6->sin6_len = sizeof(struct sockaddr_in6);
 398         }
 399 #endif
 400         else
 401                 return NULL;
 402
 403         /*
 404          * Only take exact matches, any sockets with
 405          * previously unbound addresses will be deleted
 406          * below in the display routine because they
 407          * will appear as ``not seen'' in the kernel
 408          * data structures.
 409          */
 410         TAILQ_FOREACH(p, &netcb, chain) {
 411                 if (!streq(proto, p->ni_proto))
 412                         continue;
 413                 if (p->ni_lsa.ss_family != lsa.ss_family ||
 414                     memcmp(&p->ni_lsa, &lsa, lsa.ss_len) != 0)
 415                         continue;
 416                 if (p->ni_fsa.ss_family == fsa.ss_family &&
 417                     memcmp(&p->ni_fsa, &fsa, fsa.ss_len) == 0)
 418                         break;
 419         }
 420         if (p == NULL) {
 421                 if ((p = malloc(sizeof(*p))) == NULL) {
 422                         error("Out of memory");
 423                         return NULL;
 424                 }
 425                 TAILQ_INSERT_HEAD(&netcb, p, chain);
 426                 p->ni_line = -1;
 427                 memcpy(&p->ni_lsa, &lsa, lsa.ss_len);
 428                 memcpy(&p->ni_fsa, &fsa, fsa.ss_len);
 429                 p->ni_proto = strdup(proto);
 430                 p->ni_flags = NIF_LACHG|NIF_FACHG;
 431         }
 432         p->ni_state = state;
 433         p->ni_seen = 1;
 434         return p;
 435 }
 436
 437 /* column locations */
 438 #define LADDR   0
 439 #define FADDR   LADDR+23
 440 #define PROTO   FADDR+23
 441 #define RCVCC   PROTO+6
 442 #define SNDCC   RCVCC+7
 443 #define STATE   SNDCC+7
 444
 445
 446 void
 447 labelnetstat(void)
 448 {
 449         if (use_kvm && namelist[X_TCB].n_type == 0)
 450                 return;
 451         wmove(wnd, 0, 0); wclrtobot(wnd);
 452         mvwaddstr(wnd, 0, LADDR, "Local Address");
 453         mvwaddstr(wnd, 0, FADDR, "Foreign Address");
 454         mvwaddstr(wnd, 0, PROTO, "Proto");
 455         mvwaddstr(wnd, 0, RCVCC, "Recv-Q");
 456         mvwaddstr(wnd, 0, SNDCC, "Send-Q");
 457         mvwaddstr(wnd, 0, STATE, "(state)");
 458 }
 459
 460 void
 461 shownetstat(void)
 462 {
 463         struct netinfo *p, *q;
 464         char proto[6];
 465         const char *family = "";
 466
 467         /*
 468          * First, delete any connections that have gone
 469          * away and adjust the position of connections
 470          * below to reflect the deleted line.
 471          */
 472         p = TAILQ_FIRST(&netcb);
 473         while (p != NULL) {
 474                 if (p->ni_line == -1 || p->ni_seen) {
 475                         p = TAILQ_NEXT(p, chain);
 476                         continue;
 477                 }
 478                 wmove(wnd, p->ni_line, 0); wdeleteln(wnd);
 479                 TAILQ_FOREACH(q, &netcb, chain)
 480                         if (q != p && q->ni_line > p->ni_line) {
 481                                 q->ni_line--;
 482                                 /* this shouldn't be necessary */
 483                                 q->ni_flags |= NIF_LACHG|NIF_FACHG;
 484                         }
 485                 lastrow--;
 486                 q = TAILQ_NEXT(p, chain);
 487                 TAILQ_REMOVE(&netcb, p, chain);
 488                 free(p);
 489                 p = q;
 490         }
 491         /*
 492          * Update existing connections and add new ones.
 493          */
 494         TAILQ_FOREACH(p, &netcb, chain) {
 495                 if (p->ni_line == -1) {
 496                         /*
 497                          * Add a new entry if possible.
 498                          */
 499                         if (lastrow > YMAX(wnd))
 500                                 continue;
 501                         p->ni_line = lastrow++;
 502                         p->ni_flags |= NIF_LACHG|NIF_FACHG;
 503                 }
 504                 if (p->ni_flags & NIF_LACHG) {
 505                         wmove(wnd, p->ni_line, LADDR);
 506                         inetprint((struct sockaddr *)&p->ni_lsa, p->ni_proto);
 507                         p->ni_flags &= ~NIF_LACHG;
 508                 }
 509                 if (p->ni_flags & NIF_FACHG) {
 510                         wmove(wnd, p->ni_line, FADDR);
 511                         inetprint((struct sockaddr *)&p->ni_fsa, p->ni_proto);
 512                         p->ni_flags &= ~NIF_FACHG;
 513                 }
 514 #ifdef INET6
 515                 family = (p->ni_lsa.ss_family == AF_INET) ? "4" : "6";
 516 #endif
 517                 snprintf(proto, sizeof(proto), "%s%s", p->ni_proto, family);
 518                 mvwaddstr(wnd, p->ni_line, PROTO, proto);
 519                 mvwprintw(wnd, p->ni_line, RCVCC, "%6u", p->ni_rcvcc);
 520                 mvwprintw(wnd, p->ni_line, SNDCC, "%6u", p->ni_sndcc);
 521                 if (streq(p->ni_proto, "tcp")) {
 522                         if (p->ni_state < 0 || p->ni_state >= TCP_NSTATES)
 523                                 mvwprintw(wnd, p->ni_line, STATE, "%d",
 524                                     p->ni_state);
 525                         else
 526                                 mvwaddstr(wnd, p->ni_line, STATE,
 527                                     tcpstates[p->ni_state]);
 528                 }
 529                 wclrtoeol(wnd);
 530         }
 531         if (lastrow < YMAX(wnd)) {
 532                 wmove(wnd, lastrow, 0); wclrtobot(wnd);
 533                 wmove(wnd, YMAX(wnd), 0); wdeleteln(wnd);       /* XXX */
 534         }
 535 }
 536
 537 /*
 538  * Pretty print an Internet address (net address + port).
 539  * If the nflag was specified, use numbers instead of names.
 540  */
 541 static void
 542 inetprint(struct sockaddr *sa, const char *proto)
 543 {
 544         struct servent *sp = 0;
 545         char line[80], *cp;
 546         int port;
 547
 548         switch (sa->sa_family) {
 549         case AF_INET:
 550                 port = ((struct sockaddr_in *)sa)->sin_port;
 551                 break;
 552 #ifdef INET6
 553         case AF_INET6:
 554                 port = ((struct sockaddr_in6 *)sa)->sin6_port;
 555                 break;
 556 #endif
 557         default:
 558                 port = 0;
 559                 break;
 560         }
 561         snprintf(line, sizeof(line), "%.*s.", 16, inetname(sa));
 562         cp = index(line, '\0');
 563         if (!nflag && port)
 564                 sp = getservbyport(port, proto);
 565         if (sp || port == 0)
 566                 snprintf(cp, sizeof(line) - (cp - line), "%.8s",
 567                     sp ? sp->s_name : "*");
 568         else
 569                 snprintf(cp, sizeof(line) - (cp - line), "%d",
 570                     ntohs((u_short)port));
 571         /* pad to full column to clear any garbage */
 572         cp = index(line, '\0');
 573         while (cp - line < 22)
 574                 *cp++ = ' ';
 575         line[22] = '\0';
 576         waddstr(wnd, line);
 577 }
 578
 579 /*
 580  * Construct an Internet address representation.
 581  * If the nflag has been supplied, give
 582  * numeric value, otherwise try for symbolic name.
 583  */
 584 static char *
 585 inetname(struct sockaddr *sa)
 586 {
 587         char *cp = 0;
 588         static char line[NI_MAXHOST];
 589         struct hostent *hp;
 590         struct netent *np;
 591         struct in_addr in;
 592
 593 #ifdef INET6
 594         if (sa->sa_family == AF_INET6) {
 595                 if (memcmp(&((struct sockaddr_in6 *)sa)->sin6_addr,
 596                     &in6addr_any, sizeof(in6addr_any)) == 0)
 597                         strcpy(line, "*");
 598                 else
 599                         getnameinfo(sa, sa->sa_len, line, sizeof(line), NULL, 0,
 600                             nflag ? NI_NUMERICHOST : 0);
 601                 return (line);
 602         }
 603 #endif
 604
 605         in = ((struct sockaddr_in *)sa)->sin_addr;
 606         if (!nflag && in.s_addr != INADDR_ANY) {
 607                 int net = inet_netof(in);
 608                 int lna = inet_lnaof(in);
 609
 610                 if (lna == INADDR_ANY) {
 611                         np = getnetbyaddr(net, AF_INET);
 612                         if (np)
 613                                 cp = np->n_name;
 614                 }
 615                 if (cp == 0) {
 616                         hp = gethostbyaddr((char *)&in, sizeof (in), AF_INET);
 617                         if (hp)
 618                                 cp = hp->h_name;
 619                 }
 620         }
 621         if (in.s_addr == INADDR_ANY)
 622                 strcpy(line, "*");
 623         else if (cp)
 624                 snprintf(line, sizeof(line), "%s", cp);
 625         else {
 626                 in.s_addr = ntohl(in.s_addr);
 627 #define C(x)    ((x) & 0xff)
 628                 snprintf(line, sizeof(line), "%u.%u.%u.%u", C(in.s_addr >> 24),
 629                         C(in.s_addr >> 16), C(in.s_addr >> 8), C(in.s_addr));
 630         }
 631         return (line);
 632 }
 633
 634 int
 635 cmdnetstat(const char *cmd, const char *args)
 636 {
 637         if (prefix(cmd, "all")) {
 638                 aflag = !aflag;
 639                 goto fixup;
 640         }
 641         if  (prefix(cmd, "numbers") || prefix(cmd, "names")) {
 642                 struct netinfo *p;
 643                 int new;
 644
 645                 new = prefix(cmd, "numbers");
 646                 if (new == nflag)
 647                         return (1);
 648                 TAILQ_FOREACH(p, &netcb, chain) {
 649                         if (p->ni_line == -1)
 650                                 continue;
 651                         p->ni_flags |= NIF_LACHG|NIF_FACHG;
 652                 }
 653                 nflag = new;
 654                 goto redisplay;
 655         }
 656         if (!netcmd(cmd, args))
 657                 return (0);
 658 fixup:
 659         fetchnetstat();
 660 redisplay:
 661         shownetstat();
 662         refresh();
 663         return (1);
 664 }