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  * @(#)netstat.c        8.1 (Berkeley) 6/6/93
  34  * $FreeBSD: src/usr.bin/systat/netstat.c,v 1.13 1999/08/30 08:18:08 peter Exp $
  35  * $DragonFly: src/usr.bin/systat/netstat.c,v 1.11 2008/11/10 04:59:45 swildner Exp $
  36  */
  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 #include <sys/sysctl.h>
  47
  48 #include <netinet/in.h>
  49 #include <arpa/inet.h>
  50 #include <net/route.h>
  51 #include <netinet/in_systm.h>
  52 #include <netinet/ip.h>
  53 #ifdef INET6
  54 #include <netinet/ip6.h>
  55 #endif
  56 #include <netinet/in_pcb.h>
  57 #include <netinet/ip_icmp.h>
  58 #include <netinet/icmp_var.h>
  59 #include <netinet/ip_var.h>
  60 #include <netinet/tcp.h>
  61 #include <netinet/tcpip.h>
  62 #include <netinet/tcp_seq.h>
  63 #define TCPSTATES
  64 #include <netinet/tcp_fsm.h>
  65 #include <netinet/tcp_timer.h>
  66 #include <netinet/tcp_var.h>
  67 #include <netinet/tcp_debug.h>
  68 #include <netinet/udp.h>
  69 #include <netinet/udp_var.h>
  70
  71 #include <err.h>
  72 #include <errno.h>
  73 #include <netdb.h>
  74 #include <stdlib.h>
  75 #include <string.h>
  76 #include <nlist.h>
  77 #include <paths.h>
  78 #include "systat.h"
  79 #include "extern.h"
  80
  81 static void enter(struct inpcb *, struct xsocket *, int, const char *);
  82 static char *inetname(struct in_addr);
  83 static void inetprint(struct in_addr *, int, const char *);
  84
  85 #define streq(a,b)      (strcmp(a,b)==0)
  86 #define YMAX(w)         ((w)->_maxy-1)
  87
  88 WINDOW *
  89 opennetstat(void)
  90 {
  91         sethostent(1);
  92         setnetent(1);
  93         return (subwin(stdscr, LINES-5-1, 0, 5, 0));
  94 }
  95
  96 struct netinfo {
  97         struct  netinfo *ni_forw, *ni_prev;
  98         short   ni_line;                /* line on screen */
  99         short   ni_seen;                /* 0 when not present in list */
 100         short   ni_flags;
 101 #define NIF_LACHG       0x1             /* local address changed */
 102 #define NIF_FACHG       0x2             /* foreign address changed */
 103         short   ni_state;               /* tcp state */
 104         const char *ni_proto;           /* protocol */
 105         struct  in_addr ni_laddr;       /* local address */
 106         long    ni_lport;               /* local port */
 107         struct  in_addr ni_faddr;       /* foreign address */
 108         long    ni_fport;               /* foreign port */
 109         long    ni_rcvcc;               /* rcv buffer character count */
 110         long    ni_sndcc;               /* snd buffer character count */
 111 };
 112
 113 static struct {
 114         struct  netinfo *ni_forw, *ni_prev;
 115 } netcb;
 116
 117 static  int aflag = 0;
 118 static  int nflag = 0;
 119 static  int lastrow = 1;
 120
 121 void
 122 closenetstat(WINDOW *w)
 123 {
 124         struct netinfo *p;
 125
 126         endhostent();
 127         endnetent();
 128         p = (struct netinfo *)netcb.ni_forw;
 129         while (p != (struct netinfo *)&netcb) {
 130                 if (p->ni_line != -1)
 131                         lastrow--;
 132                 p->ni_line = -1;
 133                 p = p->ni_forw;
 134         }
 135         if (w != NULL) {
 136                 wclear(w);
 137                 wrefresh(w);
 138                 delwin(w);
 139         }
 140 }
 141
 142 int
 143 initnetstat(void)
 144 {
 145         netcb.ni_forw = netcb.ni_prev = (struct netinfo *)&netcb;
 146         protos = TCP|UDP;
 147         return(1);
 148 }
 149
 150 static void
 151 enter_tcp(void *xig)
 152 {
 153         struct xtcpcb *xtcp = (struct xtcpcb *)xig;
 154         struct xsocket *xso;
 155         int state;
 156
 157         if (xtcp->xt_len < sizeof(*xtcp))
 158                 return;
 159         xso = &xtcp->xt_socket;
 160         state = xtcp->xt_tp.t_state;
 161         enter(&xtcp->xt_inp, xso, state, "tcp");
 162 }
 163
 164 static void
 165 enter_udp(void *xig)
 166 {
 167         struct xinpcb *xinp = (struct xinpcb *)xig;
 168         struct xsocket *xso;
 169
 170         if (xinp->xi_len < sizeof(*xinp))
 171                 return;
 172         xso = &xinp->xi_socket;
 173         enter(&xinp->xi_inp, xso, 0, "udp");
 174 }
 175
 176 static void
 177 fetchnetstat_proto(void (*enter_proto)(void *),
 178     const char *mibvar)
 179 {
 180         char *buf, *buf2;
 181         size_t i, len, elem_len;
 182
 183         if (sysctlbyname(mibvar, 0, &len, 0, 0) < 0) {
 184                 if (errno != ENOENT)
 185                         warn("sysctl: %s", mibvar);
 186                 return;
 187         }
 188         if ((buf = malloc(len)) == NULL) {
 189                 warn("malloc %lu bytes", (u_long)len);
 190                 return;
 191         }
 192         if (sysctlbyname(mibvar, buf, &len, 0, 0) < 0) {
 193                 warn("sysctl: %s", mibvar);
 194                 free(buf);
 195                 return;
 196         }
 197
 198         /*
 199          * XXX this is better with a single PCB type
 200          */
 201         if (len == 0) {
 202                 free(buf);
 203                 return;
 204         }
 205         if (len < sizeof(size_t)) {
 206                 warnx("sysctl: short read");
 207                 free(buf);
 208                 return;
 209         }
 210         elem_len = *(size_t *)buf;
 211         len /= elem_len;
 212         buf2 = buf;
 213         for (i = 0; i < len; i++, buf2 += elem_len) {
 214                 if (*(size_t *)(buf2) != elem_len) {
 215                         warn("sysctl: inconsistent PCB len");
 216                         free(buf);
 217                         return;
 218                 }
 219                 enter_proto(buf2);
 220         }
 221         free(buf);
 222 }
 223
 224 void
 225 fetchnetstat(void)
 226 {
 227         struct netinfo *p;
 228
 229         for (p = netcb.ni_forw; p != (struct netinfo *)&netcb; p = p->ni_forw)
 230                 p->ni_seen = 0;
 231         if (protos & TCP)
 232                 fetchnetstat_proto(enter_tcp, "net.inet.tcp.pcblist");
 233         if (protos & UDP)
 234                 fetchnetstat_proto(enter_udp, "net.inet.udp.pcblist");
 235 }
 236
 237 static void
 238 enter(struct inpcb *inp, struct xsocket *so, int state, const char *proto)
 239 {
 240         struct netinfo *p;
 241
 242         if (!aflag && inet_lnaof(inp->inp_laddr) == INADDR_ANY)
 243                 return;
 244         if (nhosts && !checkhost(inp))
 245                 return;
 246         if (nports && !checkport(inp))
 247                 return;
 248         /*
 249          * pcblist may return non-ipv4 sockets, but at the moment
 250          * -netstat code doesn't support other than ipv4.
 251          */
 252         if ((inp->inp_vflag & INP_IPV4) == 0)
 253                 return;
 254         /*
 255          * Only take exact matches, any sockets with
 256          * previously unbound addresses will be deleted
 257          * below in the display routine because they
 258          * will appear as ``not seen'' in the kernel
 259          * data structures.
 260          */
 261         for (p = netcb.ni_forw; p != (struct netinfo *)&netcb; p = p->ni_forw) {
 262                 if (!streq(proto, p->ni_proto))
 263                         continue;
 264                 if (p->ni_lport != inp->inp_lport ||
 265                     p->ni_laddr.s_addr != inp->inp_laddr.s_addr)
 266                         continue;
 267                 if (p->ni_faddr.s_addr == inp->inp_faddr.s_addr &&
 268                     p->ni_fport == inp->inp_fport)
 269                         break;
 270         }
 271         if (p == (struct netinfo *)&netcb) {
 272                 if ((p = malloc(sizeof(*p))) == NULL) {
 273                         error("Out of memory");
 274                         return;
 275                 }
 276                 p->ni_prev = (struct netinfo *)&netcb;
 277                 p->ni_forw = netcb.ni_forw;
 278                 netcb.ni_forw->ni_prev = p;
 279                 netcb.ni_forw = p;
 280                 p->ni_line = -1;
 281                 p->ni_laddr = inp->inp_laddr;
 282                 p->ni_lport = inp->inp_lport;
 283                 p->ni_faddr = inp->inp_faddr;
 284                 p->ni_fport = inp->inp_fport;
 285                 p->ni_proto = proto;
 286                 p->ni_flags = NIF_LACHG|NIF_FACHG;
 287         }
 288         p->ni_rcvcc = so->so_rcv.sb_cc;
 289         p->ni_sndcc = so->so_snd.sb_cc;
 290         p->ni_state = state;
 291         p->ni_seen = 1;
 292 }
 293
 294 /* column locations */
 295 #define LADDR   0
 296 #define FADDR   LADDR+22
 297 #define CPUID   FADDR+22
 298 #define PROTO   CPUID+4
 299 #define RCVCC   PROTO+6
 300 #define SNDCC   RCVCC+7
 301 #define STATE   SNDCC+7
 302
 303
 304 void
 305 labelnetstat(void)
 306 {
 307         wmove(wnd, 0, 0); wclrtobot(wnd);
 308         mvwaddstr(wnd, 0, LADDR, "Local Address");
 309         mvwaddstr(wnd, 0, FADDR, "Foreign Address");
 310         mvwaddstr(wnd, 0, PROTO, "Proto");
 311         mvwaddstr(wnd, 0, RCVCC, "Recv-Q");
 312         mvwaddstr(wnd, 0, SNDCC, "Send-Q");
 313         mvwaddstr(wnd, 0, STATE, "(state)");
 314 }
 315
 316 void
 317 shownetstat(void)
 318 {
 319         struct netinfo *p, *q;
 320
 321         /*
 322          * First, delete any connections that have gone
 323          * away and adjust the position of connections
 324          * below to reflect the deleted line.
 325          */
 326         p = netcb.ni_forw;
 327         while (p != (struct netinfo *)&netcb) {
 328                 if (p->ni_line == -1 || p->ni_seen) {
 329                         p = p->ni_forw;
 330                         continue;
 331                 }
 332                 wmove(wnd, p->ni_line, 0); wdeleteln(wnd);
 333                 q = netcb.ni_forw;
 334                 for (; q != (struct netinfo *)&netcb; q = q->ni_forw)
 335                         if (q != p && q->ni_line > p->ni_line) {
 336                                 q->ni_line--;
 337                                 /* this shouldn't be necessary */
 338                                 q->ni_flags |= NIF_LACHG|NIF_FACHG;
 339                         }
 340                 lastrow--;
 341                 q = p->ni_forw;
 342                 p->ni_prev->ni_forw = p->ni_forw;
 343                 p->ni_forw->ni_prev = p->ni_prev;
 344                 free(p);
 345                 p = q;
 346         }
 347         /*
 348          * Update existing connections and add new ones.
 349          */
 350         for (p = netcb.ni_forw; p != (struct netinfo *)&netcb; p = p->ni_forw) {
 351                 if (p->ni_line == -1) {
 352                         /*
 353                          * Add a new entry if possible.
 354                          */
 355                         if (lastrow > YMAX(wnd))
 356                                 continue;
 357                         p->ni_line = lastrow++;
 358                         p->ni_flags |= NIF_LACHG|NIF_FACHG;
 359                 }
 360                 if (p->ni_flags & NIF_LACHG) {
 361                         wmove(wnd, p->ni_line, LADDR);
 362                         inetprint(&p->ni_laddr, p->ni_lport, p->ni_proto);
 363                         p->ni_flags &= ~NIF_LACHG;
 364                 }
 365                 if (p->ni_flags & NIF_FACHG) {
 366                         wmove(wnd, p->ni_line, FADDR);
 367                         inetprint(&p->ni_faddr, p->ni_fport, p->ni_proto);
 368                         p->ni_flags &= ~NIF_FACHG;
 369                 }
 370                 mvwaddstr(wnd, p->ni_line, PROTO, p->ni_proto);
 371                 mvwprintw(wnd, p->ni_line, RCVCC, "%6d", p->ni_rcvcc);
 372                 mvwprintw(wnd, p->ni_line, SNDCC, "%6d", p->ni_sndcc);
 373                 if (streq(p->ni_proto, "tcp")) {
 374                         if (p->ni_state < 0 || p->ni_state >= TCP_NSTATES)
 375                                 mvwprintw(wnd, p->ni_line, STATE, "%d",
 376                                     p->ni_state);
 377                         else
 378                                 mvwaddstr(wnd, p->ni_line, STATE,
 379                                     tcpstates[p->ni_state]);
 380                 }
 381                 wclrtoeol(wnd);
 382         }
 383         if (lastrow < YMAX(wnd)) {
 384                 wmove(wnd, lastrow, 0); wclrtobot(wnd);
 385                 wmove(wnd, YMAX(wnd), 0); wdeleteln(wnd);       /* XXX */
 386         }
 387 }
 388
 389 /*
 390  * Pretty print an Internet address (net address + port).
 391  * If the nflag was specified, use numbers instead of names.
 392  */
 393 static void
 394 inetprint(struct in_addr *in, int port, const char *proto)
 395 {
 396         struct servent *sp = 0;
 397         char line[80], *cp;
 398
 399         snprintf(line, sizeof(line), "%.*s.", 16, inetname(*in));
 400         cp = strchr(line, '\0');
 401         if (!nflag && port)
 402                 sp = getservbyport(port, proto);
 403         if (sp || port == 0)
 404                 snprintf(cp, sizeof(line) - (cp - line), "%.8s",
 405                     sp ? sp->s_name : "*");
 406         else
 407                 snprintf(cp, sizeof(line) - (cp - line), "%d",
 408                     ntohs((u_short)port));
 409         /* pad to full column to clear any garbage */
 410         cp = strchr(line, '\0');
 411         while (cp - line < 22)
 412                 *cp++ = ' ';
 413         line[22] = '\0';
 414         waddstr(wnd, line);
 415 }
 416
 417 /*
 418  * Construct an Internet address representation.
 419  * If the nflag has been supplied, give
 420  * numeric value, otherwise try for symbolic name.
 421  */
 422 static char *
 423 inetname(struct in_addr in)
 424 {
 425         char *cp = 0;
 426         static char line[50];
 427         struct hostent *hp;
 428         struct netent *np;
 429
 430         if (!nflag && in.s_addr != INADDR_ANY) {
 431                 int net = inet_netof(in);
 432                 int lna = inet_lnaof(in);
 433
 434                 if (lna == INADDR_ANY) {
 435                         np = getnetbyaddr(net, AF_INET);
 436                         if (np)
 437                                 cp = np->n_name;
 438                 }
 439                 if (cp == 0) {
 440                         hp = gethostbyaddr(&in, sizeof (in), AF_INET);
 441                         if (hp)
 442                                 cp = hp->h_name;
 443                 }
 444         }
 445         if (in.s_addr == INADDR_ANY)
 446                 strcpy(line, "*");
 447         else if (cp)
 448                 snprintf(line, sizeof(line), "%s", cp);
 449         else {
 450                 in.s_addr = ntohl(in.s_addr);
 451 #define C(x)    ((x) & 0xff)
 452                 snprintf(line, sizeof(line), "%u.%u.%u.%u", C(in.s_addr >> 24),
 453                         C(in.s_addr >> 16), C(in.s_addr >> 8), C(in.s_addr));
 454         }
 455         return (line);
 456 }
 457
 458 int
 459 cmdnetstat(const char *cmd, char *args)
 460 {
 461         struct netinfo *p;
 462
 463         if (prefix(cmd, "all")) {
 464                 aflag = !aflag;
 465                 goto fixup;
 466         }
 467         if  (prefix(cmd, "numbers") || prefix(cmd, "names")) {
 468                 int new;
 469
 470                 new = prefix(cmd, "numbers");
 471                 if (new == nflag)
 472                         return (1);
 473                 p = netcb.ni_forw;
 474                 for (; p != (struct netinfo *)&netcb; p = p->ni_forw) {
 475                         if (p->ni_line == -1)
 476                                 continue;
 477                         p->ni_flags |= NIF_LACHG|NIF_FACHG;
 478                 }
 479                 nflag = new;
 480                 goto redisplay;
 481         }
 482         if (!netcmd(cmd, args))
 483                 return (0);
 484 fixup:
 485         fetchnetstat();
 486 redisplay:
 487         shownetstat();
 488         refresh();
 489         return (1);
 490 }