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. 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  * @(#)netstat.c        8.1 (Berkeley) 6/6/93
  30  * $FreeBSD: src/usr.bin/systat/netstat.c,v 1.13 1999/08/30 08:18:08 peter Exp $
  31  */
  32
  33 /*
  34  * netstat
  35  */
  36 #include <sys/param.h>
  37 #include <sys/queue.h>
  38 #include <sys/socket.h>
  39 #include <sys/socketvar.h>
  40 #include <sys/protosw.h>
  41 #include <sys/sysctl.h>
  42
  43 #include <netinet/in.h>
  44 #include <arpa/inet.h>
  45 #include <net/route.h>
  46 #include <netinet/in_systm.h>
  47 #include <netinet/ip.h>
  48 #ifdef INET6
  49 #include <netinet/ip6.h>
  50 #endif
  51 #include <netinet/in_pcb.h>
  52 #include <netinet/ip_icmp.h>
  53 #include <netinet/icmp_var.h>
  54 #include <netinet/ip_var.h>
  55 #include <netinet/tcp.h>
  56 #include <netinet/tcpip.h>
  57 #include <netinet/tcp_seq.h>
  58 #define TCPSTATES
  59 #include <netinet/tcp_fsm.h>
  60 #include <netinet/tcp_timer.h>
  61 #include <netinet/tcp_var.h>
  62 #include <netinet/tcp_debug.h>
  63 #include <netinet/udp.h>
  64 #include <netinet/udp_var.h>
  65
  66 #include <err.h>
  67 #include <errno.h>
  68 #include <netdb.h>
  69 #include <stdlib.h>
  70 #include <string.h>
  71 #include <nlist.h>
  72 #include <paths.h>
  73 #include "systat.h"
  74 #include "extern.h"
  75
  76 static void enter(struct inpcb *, struct xsocket *, int, const char *);
  77 static char *inetname(struct in_addr);
  78 static void inetprint(struct in_addr *, int, const char *);
  79
  80 #define streq(a,b)      (strcmp(a,b)==0)
  81 #define YMAX(w)         ((w)->_maxy-1)
  82
  83 WINDOW *
  84 opennetstat(void)
  85 {
  86         sethostent(1);
  87         setnetent(1);
  88         return (subwin(stdscr, LINES-5-1, 0, 5, 0));
  89 }
  90
  91 struct netinfo {
  92         struct  netinfo *ni_forw, *ni_prev;
  93         short   ni_line;                /* line on screen */
  94         short   ni_seen;                /* 0 when not present in list */
  95         short   ni_flags;
  96 #define NIF_LACHG       0x1             /* local address changed */
  97 #define NIF_FACHG       0x2             /* foreign address changed */
  98         short   ni_state;               /* tcp state */
  99         const char *ni_proto;           /* protocol */
 100         struct  in_addr ni_laddr;       /* local address */
 101         long    ni_lport;               /* local port */
 102         struct  in_addr ni_faddr;       /* foreign address */
 103         long    ni_fport;               /* foreign port */
 104         long    ni_rcvcc;               /* rcv buffer character count */
 105         long    ni_sndcc;               /* snd buffer character count */
 106 };
 107
 108 static struct {
 109         struct  netinfo *ni_forw, *ni_prev;
 110 } netcb;
 111
 112 static  int aflag = 0;
 113 static  int nflag = 0;
 114 static  int lastrow = 1;
 115
 116 void
 117 closenetstat(WINDOW *w)
 118 {
 119         struct netinfo *p;
 120
 121         endhostent();
 122         endnetent();
 123         p = (struct netinfo *)netcb.ni_forw;
 124         while (p != (struct netinfo *)&netcb) {
 125                 if (p->ni_line != -1)
 126                         lastrow--;
 127                 p->ni_line = -1;
 128                 p = p->ni_forw;
 129         }
 130         if (w != NULL) {
 131                 wclear(w);
 132                 wrefresh(w);
 133                 delwin(w);
 134         }
 135 }
 136
 137 int
 138 initnetstat(void)
 139 {
 140         netcb.ni_forw = netcb.ni_prev = (struct netinfo *)&netcb;
 141         protos = TCP|UDP;
 142         return(1);
 143 }
 144
 145 static void
 146 enter_tcp(void *xig)
 147 {
 148         struct xtcpcb *xtcp = (struct xtcpcb *)xig;
 149         struct xsocket *xso;
 150         int state;
 151
 152         if (xtcp->xt_len < sizeof(*xtcp))
 153                 return;
 154         xso = &xtcp->xt_socket;
 155         state = xtcp->xt_tp.t_state;
 156         enter(&xtcp->xt_inp, xso, state, "tcp");
 157 }
 158
 159 static void
 160 enter_udp(void *xig)
 161 {
 162         struct xinpcb *xinp = (struct xinpcb *)xig;
 163         struct xsocket *xso;
 164
 165         if (xinp->xi_len < sizeof(*xinp))
 166                 return;
 167         xso = &xinp->xi_socket;
 168         enter(&xinp->xi_inp, xso, 0, "udp");
 169 }
 170
 171 static void
 172 fetchnetstat_proto(void (*enter_proto)(void *),
 173     const char *mibvar)
 174 {
 175         char *buf, *buf2;
 176         size_t i, len, elem_len;
 177
 178         if (sysctlbyname(mibvar, 0, &len, 0, 0) < 0) {
 179                 if (errno != ENOENT)
 180                         warn("sysctl: %s", mibvar);
 181                 return;
 182         }
 183         if ((buf = malloc(len)) == NULL) {
 184                 warn("malloc %lu bytes", (u_long)len);
 185                 return;
 186         }
 187         if (sysctlbyname(mibvar, buf, &len, 0, 0) < 0) {
 188                 warn("sysctl: %s", mibvar);
 189                 free(buf);
 190                 return;
 191         }
 192
 193         /*
 194          * XXX this is better with a single PCB type
 195          */
 196         if (len == 0) {
 197                 free(buf);
 198                 return;
 199         }
 200         if (len < sizeof(size_t)) {
 201                 warnx("sysctl: short read");
 202                 free(buf);
 203                 return;
 204         }
 205         elem_len = *(size_t *)buf;
 206         len /= elem_len;
 207         buf2 = buf;
 208         for (i = 0; i < len; i++, buf2 += elem_len) {
 209                 if (*(size_t *)(buf2) != elem_len) {
 210                         warn("sysctl: inconsistent PCB len");
 211                         free(buf);
 212                         return;
 213                 }
 214                 enter_proto(buf2);
 215         }
 216         free(buf);
 217 }
 218
 219 void
 220 fetchnetstat(void)
 221 {
 222         struct netinfo *p;
 223
 224         for (p = netcb.ni_forw; p != (struct netinfo *)&netcb; p = p->ni_forw)
 225                 p->ni_seen = 0;
 226         if (protos & TCP)
 227                 fetchnetstat_proto(enter_tcp, "net.inet.tcp.pcblist");
 228         if (protos & UDP)
 229                 fetchnetstat_proto(enter_udp, "net.inet.udp.pcblist");
 230 }
 231
 232 static void
 233 enter(struct inpcb *inp, struct xsocket *so, int state, const char *proto)
 234 {
 235         struct netinfo *p;
 236
 237         if (!aflag && inet_lnaof(inp->inp_laddr) == INADDR_ANY)
 238                 return;
 239         if (nhosts && !checkhost(inp))
 240                 return;
 241         if (nports && !checkport(inp))
 242                 return;
 243         /*
 244          * pcblist may return non-ipv4 sockets, but at the moment
 245          * -netstat code doesn't support other than ipv4.
 246          */
 247         if (!INP_ISIPV4(inp))
 248                 return;
 249         /*
 250          * Only take exact matches, any sockets with
 251          * previously unbound addresses will be deleted
 252          * below in the display routine because they
 253          * will appear as ``not seen'' in the kernel
 254          * data structures.
 255          */
 256         for (p = netcb.ni_forw; p != (struct netinfo *)&netcb; p = p->ni_forw) {
 257                 if (!streq(proto, p->ni_proto))
 258                         continue;
 259                 if (p->ni_lport != inp->inp_lport ||
 260                     p->ni_laddr.s_addr != inp->inp_laddr.s_addr)
 261                         continue;
 262                 if (p->ni_faddr.s_addr == inp->inp_faddr.s_addr &&
 263                     p->ni_fport == inp->inp_fport)
 264                         break;
 265         }
 266         if (p == (struct netinfo *)&netcb) {
 267                 if ((p = malloc(sizeof(*p))) == NULL) {
 268                         error("Out of memory");
 269                         return;
 270                 }
 271                 p->ni_prev = (struct netinfo *)&netcb;
 272                 p->ni_forw = netcb.ni_forw;
 273                 netcb.ni_forw->ni_prev = p;
 274                 netcb.ni_forw = p;
 275                 p->ni_line = -1;
 276                 p->ni_laddr = inp->inp_laddr;
 277                 p->ni_lport = inp->inp_lport;
 278                 p->ni_faddr = inp->inp_faddr;
 279                 p->ni_fport = inp->inp_fport;
 280                 p->ni_proto = proto;
 281                 p->ni_flags = NIF_LACHG|NIF_FACHG;
 282         }
 283         p->ni_rcvcc = so->so_rcv.sb_cc;
 284         p->ni_sndcc = so->so_snd.sb_cc;
 285         p->ni_state = state;
 286         p->ni_seen = 1;
 287 }
 288
 289 /* column locations */
 290 #define LADDR   0
 291 #define FADDR   LADDR+22
 292 #define CPUID   FADDR+22
 293 #define PROTO   CPUID+4
 294 #define RCVCC   PROTO+6
 295 #define SNDCC   RCVCC+7
 296 #define STATE   SNDCC+7
 297
 298
 299 void
 300 labelnetstat(void)
 301 {
 302         wmove(wnd, 0, 0); wclrtobot(wnd);
 303         mvwaddstr(wnd, 0, LADDR, "Local Address");
 304         mvwaddstr(wnd, 0, FADDR, "Foreign Address");
 305         mvwaddstr(wnd, 0, PROTO, "Proto");
 306         mvwaddstr(wnd, 0, RCVCC, "Recv-Q");
 307         mvwaddstr(wnd, 0, SNDCC, "Send-Q");
 308         mvwaddstr(wnd, 0, STATE, "(state)");
 309 }
 310
 311 void
 312 shownetstat(void)
 313 {
 314         struct netinfo *p, *q;
 315
 316         /*
 317          * First, delete any connections that have gone
 318          * away and adjust the position of connections
 319          * below to reflect the deleted line.
 320          */
 321         p = netcb.ni_forw;
 322         while (p != (struct netinfo *)&netcb) {
 323                 if (p->ni_line == -1 || p->ni_seen) {
 324                         p = p->ni_forw;
 325                         continue;
 326                 }
 327                 wmove(wnd, p->ni_line, 0); wdeleteln(wnd);
 328                 q = netcb.ni_forw;
 329                 for (; q != (struct netinfo *)&netcb; q = q->ni_forw)
 330                         if (q != p && q->ni_line > p->ni_line) {
 331                                 q->ni_line--;
 332                                 /* this shouldn't be necessary */
 333                                 q->ni_flags |= NIF_LACHG|NIF_FACHG;
 334                         }
 335                 lastrow--;
 336                 q = p->ni_forw;
 337                 p->ni_prev->ni_forw = p->ni_forw;
 338                 p->ni_forw->ni_prev = p->ni_prev;
 339                 free(p);
 340                 p = q;
 341         }
 342         /*
 343          * Update existing connections and add new ones.
 344          */
 345         for (p = netcb.ni_forw; p != (struct netinfo *)&netcb; p = p->ni_forw) {
 346                 if (p->ni_line == -1) {
 347                         /*
 348                          * Add a new entry if possible.
 349                          */
 350                         if (lastrow > YMAX(wnd))
 351                                 continue;
 352                         p->ni_line = lastrow++;
 353                         p->ni_flags |= NIF_LACHG|NIF_FACHG;
 354                 }
 355                 if (p->ni_flags & NIF_LACHG) {
 356                         wmove(wnd, p->ni_line, LADDR);
 357                         inetprint(&p->ni_laddr, p->ni_lport, p->ni_proto);
 358                         p->ni_flags &= ~NIF_LACHG;
 359                 }
 360                 if (p->ni_flags & NIF_FACHG) {
 361                         wmove(wnd, p->ni_line, FADDR);
 362                         inetprint(&p->ni_faddr, p->ni_fport, p->ni_proto);
 363                         p->ni_flags &= ~NIF_FACHG;
 364                 }
 365                 mvwaddstr(wnd, p->ni_line, PROTO, p->ni_proto);
 366                 mvwprintw(wnd, p->ni_line, RCVCC, "%6d", p->ni_rcvcc);
 367                 mvwprintw(wnd, p->ni_line, SNDCC, "%6d", p->ni_sndcc);
 368                 if (streq(p->ni_proto, "tcp")) {
 369                         if (p->ni_state < 0 || p->ni_state >= TCP_NSTATES)
 370                                 mvwprintw(wnd, p->ni_line, STATE, "%d",
 371                                     p->ni_state);
 372                         else
 373                                 mvwaddstr(wnd, p->ni_line, STATE,
 374                                     tcpstates[p->ni_state]);
 375                 }
 376                 wclrtoeol(wnd);
 377         }
 378         if (lastrow < YMAX(wnd)) {
 379                 wmove(wnd, lastrow, 0); wclrtobot(wnd);
 380                 wmove(wnd, YMAX(wnd), 0); wdeleteln(wnd);       /* XXX */
 381         }
 382 }
 383
 384 /*
 385  * Pretty print an Internet address (net address + port).
 386  * If the nflag was specified, use numbers instead of names.
 387  */
 388 static void
 389 inetprint(struct in_addr *in, int port, const char *proto)
 390 {
 391         struct servent *sp = NULL;
 392         char line[80], *cp;
 393
 394         snprintf(line, sizeof(line), "%.*s.", 16, inetname(*in));
 395         cp = strchr(line, '\0');
 396         if (!nflag && port)
 397                 sp = getservbyport(port, proto);
 398         if (sp || port == 0)
 399                 snprintf(cp, sizeof(line) - (cp - line), "%.8s",
 400                     sp ? sp->s_name : "*");
 401         else
 402                 snprintf(cp, sizeof(line) - (cp - line), "%d",
 403                     ntohs((u_short)port));
 404         /* pad to full column to clear any garbage */
 405         cp = strchr(line, '\0');
 406         while (cp - line < 22)
 407                 *cp++ = ' ';
 408         line[22] = '\0';
 409         waddstr(wnd, line);
 410 }
 411
 412 /*
 413  * Construct an Internet address representation.
 414  * If the nflag has been supplied, give
 415  * numeric value, otherwise try for symbolic name.
 416  */
 417 static char *
 418 inetname(struct in_addr in)
 419 {
 420         char *cp = NULL;
 421         static char line[50];
 422         struct hostent *hp;
 423         struct netent *np;
 424
 425         if (!nflag && in.s_addr != INADDR_ANY) {
 426                 int net = inet_netof(in);
 427                 int lna = inet_lnaof(in);
 428
 429                 if (lna == INADDR_ANY) {
 430                         np = getnetbyaddr(net, AF_INET);
 431                         if (np)
 432                                 cp = np->n_name;
 433                 }
 434                 if (cp == NULL) {
 435                         hp = gethostbyaddr(&in, sizeof (in), AF_INET);
 436                         if (hp)
 437                                 cp = hp->h_name;
 438                 }
 439         }
 440         if (in.s_addr == INADDR_ANY)
 441                 strcpy(line, "*");
 442         else if (cp)
 443                 snprintf(line, sizeof(line), "%s", cp);
 444         else {
 445                 in.s_addr = ntohl(in.s_addr);
 446 #define C(x)    ((x) & 0xff)
 447                 snprintf(line, sizeof(line), "%u.%u.%u.%u", C(in.s_addr >> 24),
 448                         C(in.s_addr >> 16), C(in.s_addr >> 8), C(in.s_addr));
 449         }
 450         return (line);
 451 }
 452
 453 int
 454 cmdnetstat(const char *cmd, char *args)
 455 {
 456         struct netinfo *p;
 457
 458         if (prefix(cmd, "all")) {
 459                 aflag = !aflag;
 460                 goto fixup;
 461         }
 462         if  (prefix(cmd, "numbers") || prefix(cmd, "names")) {
 463                 int new;
 464
 465                 new = prefix(cmd, "numbers");
 466                 if (new == nflag)
 467                         return (1);
 468                 p = netcb.ni_forw;
 469                 for (; p != (struct netinfo *)&netcb; p = p->ni_forw) {
 470                         if (p->ni_line == -1)
 471                                 continue;
 472                         p->ni_flags |= NIF_LACHG|NIF_FACHG;
 473                 }
 474                 nflag = new;
 475                 goto redisplay;
 476         }
 477         if (!netcmd(cmd, args))
 478                 return (0);
 479 fixup:
 480         fetchnetstat();
 481 redisplay:
 482         shownetstat();
 483         refresh();
 484         return (1);
 485 }