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