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()
  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(w)
 126         WINDOW *w;
 127 {
 128         struct netinfo *p;
 129
 130         endhostent();
 131         endnetent();
 132         TAILQ_FOREACH(p, &netcb, chain) {
 133                 if (p->ni_line != -1)
 134                         lastrow--;
 135                 p->ni_line = -1;
 136         }
 137         if (w != NULL) {
 138                 wclear(w);
 139                 wrefresh(w);
 140                 delwin(w);
 141         }
 142 }
 143
 144 static const char *miblist[] = {
 145         "net.inet.tcp.pcblist",
 146         "net.inet.udp.pcblist"
 147 };
 148
 149 static char tcb[] = "tcb", udb[] = "udb";
 150
 151 struct nlist namelist[] = {
 152 #define X_TCB   0
 153         { .n_name = tcb },
 154 #define X_UDB   1
 155         { .n_name = udb },
 156         { .n_name = NULL },
 157 };
 158
 159 int
 160 initnetstat()
 161 {
 162         protos = TCP|UDP;
 163         return(1);
 164 }
 165
 166 void
 167 fetchnetstat()
 168 {
 169         if (use_kvm)
 170                 fetchnetstat_kvm();
 171         else
 172                 fetchnetstat_sysctl();
 173 }
 174
 175 static void
 176 fetchnetstat_kvm()
 177 {
 178         struct inpcb *next;
 179         struct netinfo *p;
 180         struct inpcbhead head;
 181         struct inpcb inpcb;
 182         struct socket sockb;
 183         struct tcpcb tcpcb;
 184         void *off;
 185         int istcp;
 186
 187         if (namelist[X_TCB].n_value == 0)
 188                 return;
 189         TAILQ_FOREACH(p, &netcb, chain)
 190                 p->ni_seen = 0;
 191         if (protos&TCP) {
 192                 off = NPTR(X_TCB);
 193                 istcp = 1;
 194         }
 195         else if (protos&UDP) {
 196                 off = NPTR(X_UDB);
 197                 istcp = 0;
 198         }
 199         else {
 200                 error("No protocols to display");
 201                 return;
 202         }
 203 again:
 204         KREAD(off, &head, sizeof (struct inpcbhead));
 205         LIST_FOREACH(next, &head, inp_list) {
 206                 KREAD(next, &inpcb, sizeof (inpcb));
 207                 next = &inpcb;
 208                 if (!aflag) {
 209                         if (inpcb.inp_vflag & INP_IPV4) {
 210                                 if (inet_lnaof(inpcb.inp_laddr) == INADDR_ANY)
 211                                         continue;
 212                         }
 213 #ifdef INET6
 214                         else if (inpcb.inp_vflag & INP_IPV6) {
 215                                 if (memcmp(&inpcb.in6p_laddr,
 216                                     &in6addr_any, sizeof(in6addr_any)) == 0)
 217                                         continue;
 218                         }
 219 #endif
 220                 }
 221                 if (nhosts && !checkhost(&inpcb))
 222                         continue;
 223                 if (nports && !checkport(&inpcb))
 224                         continue;
 225                 if (istcp) {
 226                         if (inpcb.inp_flags & INP_TIMEWAIT) {
 227                                 bzero(&sockb, sizeof(sockb));
 228                                 enter_kvm(&inpcb, &sockb, TCPS_TIME_WAIT,
 229                                          "tcp");
 230                         } else {
 231                                 KREAD(inpcb.inp_socket, &sockb,
 232                                         sizeof (sockb));
 233                                 KREAD(inpcb.inp_ppcb, &tcpcb, sizeof (tcpcb));
 234                                 enter_kvm(&inpcb, &sockb, tcpcb.t_state,
 235                                         "tcp");
 236                         }
 237                 } else
 238                         enter_kvm(&inpcb, &sockb, 0, "udp");
 239         }
 240         if (istcp && (protos&UDP)) {
 241                 istcp = 0;
 242                 off = NPTR(X_UDB);
 243                 goto again;
 244         }
 245 }
 246
 247 static void
 248 fetchnetstat_sysctl()
 249 {
 250         struct netinfo *p;
 251         int idx;
 252         struct xinpgen *inpg;
 253         char *cur, *end;
 254         struct inpcb *inpcb;
 255         struct xinpcb *xip = NULL;
 256         struct xtcpcb *xtp = NULL;
 257         int plen;
 258         size_t lsz;
 259
 260         TAILQ_FOREACH(p, &netcb, chain)
 261                 p->ni_seen = 0;
 262         if (protos&TCP) {
 263                 idx = 0;
 264         } else if (protos&UDP) {
 265                 idx = 1;
 266         } else {
 267                 error("No protocols to display");
 268                 return;
 269         }
 270
 271         for (;idx < 2; idx++) {
 272                 if (idx == 1 && !(protos&UDP))
 273                         break;
 274                 inpg = (struct xinpgen *)sysctl_dynread(miblist[idx], &lsz);
 275                 if (inpg == NULL) {
 276                         error("sysctl(%s...) failed", miblist[idx]);
 277                         continue;
 278                 }
 279                 /*
 280                  * We currently do no require a consistent pcb list.
 281                  * Try to be robust in case of struct size changes
 282                  */
 283                 cur = ((char *)inpg) + inpg->xig_len;
 284                 /* There is also a trailing struct xinpgen */
 285                 end = ((char *)inpg) + lsz - inpg->xig_len;
 286                 if (end <= cur) {
 287                         free(inpg);
 288                         continue;
 289                 }
 290                 if (idx == 0) { /* TCP */
 291                         xtp = (struct xtcpcb *)cur;
 292                         plen = xtp->xt_len;
 293                 } else {
 294                         xip = (struct xinpcb *)cur;
 295                         plen = xip->xi_len;
 296                 }
 297                 while (cur + plen <= end) {
 298                         if (idx == 0) { /* TCP */
 299                                 xtp = (struct xtcpcb *)cur;
 300                                 inpcb = &xtp->xt_inp;
 301                         } else {
 302                                 xip = (struct xinpcb *)cur;
 303                                 inpcb = &xip->xi_inp;
 304                         }
 305                         cur += plen;
 306
 307                         if (!aflag) {
 308                                 if (inpcb->inp_vflag & INP_IPV4) {
 309                                         if (inet_lnaof(inpcb->inp_laddr) ==
 310                                             INADDR_ANY)
 311                                                 continue;
 312                                 }
 313 #ifdef INET6
 314                                 else if (inpcb->inp_vflag & INP_IPV6) {
 315                                         if (memcmp(&inpcb->in6p_laddr,
 316                                             &in6addr_any, sizeof(in6addr_any))
 317                                             == 0)
 318                                                 continue;
 319                                 }
 320 #endif
 321                         }
 322                         if (nhosts && !checkhost(inpcb))
 323                                 continue;
 324                         if (nports && !checkport(inpcb))
 325                                 continue;
 326                         if (idx == 0)   /* TCP */
 327                                 enter_sysctl(inpcb, &xtp->xt_socket,
 328                                     xtp->xt_tp.t_state, "tcp");
 329                         else            /* UDP */
 330                                 enter_sysctl(inpcb, &xip->xi_socket, 0, "udp");
 331                 }
 332                 free(inpg);
 333         }
 334 }
 335
 336 static void
 337 enter_kvm(inp, so, state, proto)
 338         struct inpcb *inp;
 339         struct socket *so;
 340         int state;
 341         const char *proto;
 342 {
 343         struct netinfo *p;
 344
 345         if ((p = enter(inp, state, proto)) != NULL) {
 346                 p->ni_rcvcc = so->so_rcv.sb_cc;
 347                 p->ni_sndcc = so->so_snd.sb_cc;
 348         }
 349 }
 350
 351 static void
 352 enter_sysctl(inp, so, state, proto)
 353         struct inpcb *inp;
 354         struct xsocket *so;
 355         int state;
 356         const char *proto;
 357 {
 358         struct netinfo *p;
 359
 360         if ((p = enter(inp, state, proto)) != NULL) {
 361                 p->ni_rcvcc = so->so_rcv.sb_cc;
 362                 p->ni_sndcc = so->so_snd.sb_cc;
 363         }
 364 }
 365
 366
 367 static struct netinfo *
 368 enter(inp, state, proto)
 369         struct inpcb *inp;
 370         int state;
 371         const char *proto;
 372 {
 373         struct netinfo *p;
 374         struct sockaddr_storage lsa, fsa;
 375         struct sockaddr_in *sa4;
 376 #ifdef INET6
 377         struct sockaddr_in6 *sa6;
 378 #endif
 379
 380         memset(&lsa, 0, sizeof(lsa));
 381         memset(&fsa, 0, sizeof(fsa));
 382         if (inp->inp_vflag & INP_IPV4) {
 383                 sa4 = (struct sockaddr_in *)&lsa;
 384                 sa4->sin_addr = inp->inp_laddr;
 385                 sa4->sin_port = inp->inp_lport;
 386                 sa4->sin_family = AF_INET;
 387                 sa4->sin_len = sizeof(struct sockaddr_in);
 388
 389                 sa4 = (struct sockaddr_in *)&fsa;
 390                 sa4->sin_addr = inp->inp_faddr;
 391                 sa4->sin_port = inp->inp_fport;
 392                 sa4->sin_family = AF_INET;
 393                 sa4->sin_len = sizeof(struct sockaddr_in);
 394         }
 395 #ifdef INET6
 396         else if (inp->inp_vflag & INP_IPV6) {
 397                 sa6 = (struct sockaddr_in6 *)&lsa;
 398                 memcpy(&sa6->sin6_addr, &inp->in6p_laddr,
 399                     sizeof(struct in6_addr));
 400                 sa6->sin6_port = inp->inp_lport;
 401                 sa6->sin6_family = AF_INET6;
 402                 sa6->sin6_len = sizeof(struct sockaddr_in6);
 403
 404                 sa6 = (struct sockaddr_in6 *)&fsa;
 405                 memcpy(&sa6->sin6_addr, &inp->in6p_faddr,
 406                     sizeof(struct in6_addr));
 407                 sa6->sin6_port = inp->inp_fport;
 408                 sa6->sin6_family = AF_INET6;
 409                 sa6->sin6_len = sizeof(struct sockaddr_in6);
 410         }
 411 #endif
 412         else
 413                 return NULL;
 414
 415         /*
 416          * Only take exact matches, any sockets with
 417          * previously unbound addresses will be deleted
 418          * below in the display routine because they
 419          * will appear as ``not seen'' in the kernel
 420          * data structures.
 421          */
 422         TAILQ_FOREACH(p, &netcb, chain) {
 423                 if (!streq(proto, p->ni_proto))
 424                         continue;
 425                 if (p->ni_lsa.ss_family != lsa.ss_family ||
 426                     memcmp(&p->ni_lsa, &lsa, lsa.ss_len) != 0)
 427                         continue;
 428                 if (p->ni_fsa.ss_family == fsa.ss_family &&
 429                     memcmp(&p->ni_fsa, &fsa, fsa.ss_len) == 0)
 430                         break;
 431         }
 432         if (p == NULL) {
 433                 if ((p = malloc(sizeof(*p))) == NULL) {
 434                         error("Out of memory");
 435                         return NULL;
 436                 }
 437                 TAILQ_INSERT_HEAD(&netcb, p, chain);
 438                 p->ni_line = -1;
 439                 memcpy(&p->ni_lsa, &lsa, lsa.ss_len);
 440                 memcpy(&p->ni_fsa, &fsa, fsa.ss_len);
 441                 p->ni_proto = strdup(proto);
 442                 p->ni_flags = NIF_LACHG|NIF_FACHG;
 443         }
 444         p->ni_state = state;
 445         p->ni_seen = 1;
 446         return p;
 447 }
 448
 449 /* column locations */
 450 #define LADDR   0
 451 #define FADDR   LADDR+23
 452 #define PROTO   FADDR+23
 453 #define RCVCC   PROTO+6
 454 #define SNDCC   RCVCC+7
 455 #define STATE   SNDCC+7
 456
 457
 458 void
 459 labelnetstat()
 460 {
 461         if (use_kvm && namelist[X_TCB].n_type == 0)
 462                 return;
 463         wmove(wnd, 0, 0); wclrtobot(wnd);
 464         mvwaddstr(wnd, 0, LADDR, "Local Address");
 465         mvwaddstr(wnd, 0, FADDR, "Foreign Address");
 466         mvwaddstr(wnd, 0, PROTO, "Proto");
 467         mvwaddstr(wnd, 0, RCVCC, "Recv-Q");
 468         mvwaddstr(wnd, 0, SNDCC, "Send-Q");
 469         mvwaddstr(wnd, 0, STATE, "(state)");
 470 }
 471
 472 void
 473 shownetstat()
 474 {
 475         struct netinfo *p, *q;
 476         char proto[6];
 477         const char *family = "";
 478
 479         /*
 480          * First, delete any connections that have gone
 481          * away and adjust the position of connections
 482          * below to reflect the deleted line.
 483          */
 484         p = TAILQ_FIRST(&netcb);
 485         while (p != NULL) {
 486                 if (p->ni_line == -1 || p->ni_seen) {
 487                         p = TAILQ_NEXT(p, chain);
 488                         continue;
 489                 }
 490                 wmove(wnd, p->ni_line, 0); wdeleteln(wnd);
 491                 TAILQ_FOREACH(q, &netcb, chain)
 492                         if (q != p && q->ni_line > p->ni_line) {
 493                                 q->ni_line--;
 494                                 /* this shouldn't be necessary */
 495                                 q->ni_flags |= NIF_LACHG|NIF_FACHG;
 496                         }
 497                 lastrow--;
 498                 q = TAILQ_NEXT(p, chain);
 499                 TAILQ_REMOVE(&netcb, p, chain);
 500                 free(p);
 501                 p = q;
 502         }
 503         /*
 504          * Update existing connections and add new ones.
 505          */
 506         TAILQ_FOREACH(p, &netcb, chain) {
 507                 if (p->ni_line == -1) {
 508                         /*
 509                          * Add a new entry if possible.
 510                          */
 511                         if (lastrow > YMAX(wnd))
 512                                 continue;
 513                         p->ni_line = lastrow++;
 514                         p->ni_flags |= NIF_LACHG|NIF_FACHG;
 515                 }
 516                 if (p->ni_flags & NIF_LACHG) {
 517                         wmove(wnd, p->ni_line, LADDR);
 518                         inetprint((struct sockaddr *)&p->ni_lsa, p->ni_proto);
 519                         p->ni_flags &= ~NIF_LACHG;
 520                 }
 521                 if (p->ni_flags & NIF_FACHG) {
 522                         wmove(wnd, p->ni_line, FADDR);
 523                         inetprint((struct sockaddr *)&p->ni_fsa, p->ni_proto);
 524                         p->ni_flags &= ~NIF_FACHG;
 525                 }
 526 #ifdef INET6
 527                 family = (p->ni_lsa.ss_family == AF_INET) ? "4" : "6";
 528 #endif
 529                 snprintf(proto, sizeof(proto), "%s%s", p->ni_proto, family);
 530                 mvwaddstr(wnd, p->ni_line, PROTO, proto);
 531                 mvwprintw(wnd, p->ni_line, RCVCC, "%6u", p->ni_rcvcc);
 532                 mvwprintw(wnd, p->ni_line, SNDCC, "%6u", p->ni_sndcc);
 533                 if (streq(p->ni_proto, "tcp")) {
 534                         if (p->ni_state < 0 || p->ni_state >= TCP_NSTATES)
 535                                 mvwprintw(wnd, p->ni_line, STATE, "%d",
 536                                     p->ni_state);
 537                         else
 538                                 mvwaddstr(wnd, p->ni_line, STATE,
 539                                     tcpstates[p->ni_state]);
 540                 }
 541                 wclrtoeol(wnd);
 542         }
 543         if (lastrow < YMAX(wnd)) {
 544                 wmove(wnd, lastrow, 0); wclrtobot(wnd);
 545                 wmove(wnd, YMAX(wnd), 0); wdeleteln(wnd);       /* XXX */
 546         }
 547 }
 548
 549 /*
 550  * Pretty print an Internet address (net address + port).
 551  * If the nflag was specified, use numbers instead of names.
 552  */
 553 static void
 554 inetprint(sa, proto)
 555         struct sockaddr *sa;
 556         const char *proto;
 557 {
 558         struct servent *sp = 0;
 559         char line[80], *cp;
 560         int port;
 561
 562         switch (sa->sa_family) {
 563         case AF_INET:
 564                 port = ((struct sockaddr_in *)sa)->sin_port;
 565                 break;
 566 #ifdef INET6
 567         case AF_INET6:
 568                 port = ((struct sockaddr_in6 *)sa)->sin6_port;
 569                 break;
 570 #endif
 571         default:
 572                 port = 0;
 573                 break;
 574         }
 575         snprintf(line, sizeof(line), "%.*s.", 16, inetname(sa));
 576         cp = index(line, '\0');
 577         if (!nflag && port)
 578                 sp = getservbyport(port, proto);
 579         if (sp || port == 0)
 580                 snprintf(cp, sizeof(line) - (cp - line), "%.8s",
 581                     sp ? sp->s_name : "*");
 582         else
 583                 snprintf(cp, sizeof(line) - (cp - line), "%d",
 584                     ntohs((u_short)port));
 585         /* pad to full column to clear any garbage */
 586         cp = index(line, '\0');
 587         while (cp - line < 22)
 588                 *cp++ = ' ';
 589         line[22] = '\0';
 590         waddstr(wnd, line);
 591 }
 592
 593 /*
 594  * Construct an Internet address representation.
 595  * If the nflag has been supplied, give
 596  * numeric value, otherwise try for symbolic name.
 597  */
 598 static char *
 599 inetname(sa)
 600         struct sockaddr *sa;
 601 {
 602         char *cp = 0;
 603         static char line[NI_MAXHOST];
 604         struct hostent *hp;
 605         struct netent *np;
 606         struct in_addr in;
 607
 608 #ifdef INET6
 609         if (sa->sa_family == AF_INET6) {
 610                 if (memcmp(&((struct sockaddr_in6 *)sa)->sin6_addr,
 611                     &in6addr_any, sizeof(in6addr_any)) == 0)
 612                         strcpy(line, "*");
 613                 else
 614                         getnameinfo(sa, sa->sa_len, line, sizeof(line), NULL, 0,
 615                             nflag ? NI_NUMERICHOST : 0);
 616                 return (line);
 617         }
 618 #endif
 619
 620         in = ((struct sockaddr_in *)sa)->sin_addr;
 621         if (!nflag && in.s_addr != INADDR_ANY) {
 622                 int net = inet_netof(in);
 623                 int lna = inet_lnaof(in);
 624
 625                 if (lna == INADDR_ANY) {
 626                         np = getnetbyaddr(net, AF_INET);
 627                         if (np)
 628                                 cp = np->n_name;
 629                 }
 630                 if (cp == 0) {
 631                         hp = gethostbyaddr((char *)&in, sizeof (in), AF_INET);
 632                         if (hp)
 633                                 cp = hp->h_name;
 634                 }
 635         }
 636         if (in.s_addr == INADDR_ANY)
 637                 strcpy(line, "*");
 638         else if (cp)
 639                 snprintf(line, sizeof(line), "%s", cp);
 640         else {
 641                 in.s_addr = ntohl(in.s_addr);
 642 #define C(x)    ((x) & 0xff)
 643                 snprintf(line, sizeof(line), "%u.%u.%u.%u", C(in.s_addr >> 24),
 644                         C(in.s_addr >> 16), C(in.s_addr >> 8), C(in.s_addr));
 645         }
 646         return (line);
 647 }
 648
 649 int
 650 cmdnetstat(cmd, args)
 651         const char *cmd, *args;
 652 {
 653         if (prefix(cmd, "all")) {
 654                 aflag = !aflag;
 655                 goto fixup;
 656         }
 657         if  (prefix(cmd, "numbers") || prefix(cmd, "names")) {
 658                 struct netinfo *p;
 659                 int new;
 660
 661                 new = prefix(cmd, "numbers");
 662                 if (new == nflag)
 663                         return (1);
 664                 TAILQ_FOREACH(p, &netcb, chain) {
 665                         if (p->ni_line == -1)
 666                                 continue;
 667                         p->ni_flags |= NIF_LACHG|NIF_FACHG;
 668                 }
 669                 nflag = new;
 670                 goto redisplay;
 671         }
 672         if (!netcmd(cmd, args))
 673                 return (0);
 674 fixup:
 675         fetchnetstat();
 676 redisplay:
 677         shownetstat();
 678         refresh();
 679         return (1);
 680 }