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 1.8 2004/12/20 11:03:16 joerg 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 #include <netinet/in_pcb.h>
  54 #include <netinet/ip_icmp.h>
  55 #include <netinet/icmp_var.h>
  56 #include <netinet/ip_var.h>
  57 #include <netinet/tcp.h>
  58 #include <netinet/tcpip.h>
  59 #include <netinet/tcp_seq.h>
  60 #define TCPSTATES
  61 #include <netinet/tcp_fsm.h>
  62 #include <netinet/tcp_timer.h>
  63 #include <netinet/tcp_var.h>
  64 #include <netinet/tcp_debug.h>
  65 #include <netinet/udp.h>
  66 #include <netinet/udp_var.h>
  67
  68 #include <err.h>
  69 #include <errno.h>
  70 #include <netdb.h>
  71 #include <stdlib.h>
  72 #include <string.h>
  73 #include <nlist.h>
  74 #include <paths.h>
  75 #include "systat.h"
  76 #include "extern.h"
  77
  78 static void enter(struct inpcb *, struct xsocket *, int, const char *);
  79 static char *inetname(struct in_addr);
  80 static void inetprint(struct in_addr *, int, const char *);
  81
  82 #define streq(a,b)      (strcmp(a,b)==0)
  83 #define YMAX(w)         ((w)->_maxy-1)
  84
  85 WINDOW *
  86 opennetstat(void)
  87 {
  88         sethostent(1);
  89         setnetent(1);
  90         return (subwin(stdscr, LINES-5-1, 0, 5, 0));
  91 }
  92
  93 struct netinfo {
  94         struct  netinfo *ni_forw, *ni_prev;
  95         short   ni_line;                /* line on screen */
  96         short   ni_seen;                /* 0 when not present in list */
  97         short   ni_flags;
  98 #define NIF_LACHG       0x1             /* local address changed */
  99 #define NIF_FACHG       0x2             /* foreign address changed */
 100         short   ni_state;               /* tcp state */
 101         const char *ni_proto;           /* protocol */
 102         struct  in_addr ni_laddr;       /* local address */
 103         long    ni_lport;               /* local port */
 104         struct  in_addr ni_faddr;       /* foreign address */
 105         long    ni_fport;               /* foreign port */
 106         long    ni_rcvcc;               /* rcv buffer character count */
 107         long    ni_sndcc;               /* snd buffer character count */
 108 };
 109
 110 static struct {
 111         struct  netinfo *ni_forw, *ni_prev;
 112 } netcb;
 113
 114 static  int aflag = 0;
 115 static  int nflag = 0;
 116 static  int lastrow = 1;
 117
 118 void
 119 closenetstat(WINDOW *w)
 120 {
 121         register struct netinfo *p;
 122
 123         endhostent();
 124         endnetent();
 125         p = (struct netinfo *)netcb.ni_forw;
 126         while (p != (struct netinfo *)&netcb) {
 127                 if (p->ni_line != -1)
 128                         lastrow--;
 129                 p->ni_line = -1;
 130                 p = p->ni_forw;
 131         }
 132         if (w != NULL) {
 133                 wclear(w);
 134                 wrefresh(w);
 135                 delwin(w);
 136         }
 137 }
 138
 139 int
 140 initnetstat(void)
 141 {
 142         netcb.ni_forw = netcb.ni_prev = (struct netinfo *)&netcb;
 143         protos = TCP|UDP;
 144         return(1);
 145 }
 146
 147 static void
 148 enter_tcp(void *xig)
 149 {
 150         struct xtcpcb *xtcp = (struct xtcpcb *)xig;
 151         struct xsocket *xso;
 152         int state;
 153
 154         if (xtcp->xt_len < sizeof(*xtcp))
 155                 return;
 156         xso = &xtcp->xt_socket;
 157         state = xtcp->xt_tp.t_state;
 158         enter(&xtcp->xt_inp, xso, state, "tcp");
 159 }
 160
 161 static void
 162 enter_udp(void *xig)
 163 {
 164         struct xinpcb *xinp = (struct xinpcb *)xig;
 165         struct xsocket *xso;
 166
 167         if (xinp->xi_len < sizeof(*xinp))
 168                 return;
 169         xso = &xinp->xi_socket;
 170         enter(&xinp->xi_inp, xso, 0, "udp");
 171 }
 172
 173 static void
 174 fetchnetstat_proto(void (*enter_proto)(void *),
 175     const char *mibvar)
 176 {
 177         char *buf, *buf2;
 178         size_t i, len, elem_len;
 179
 180         if (sysctlbyname(mibvar, 0, &len, 0, 0) < 0) {
 181                 if (errno != ENOENT)
 182                         warn("sysctl: %s", mibvar);
 183                 return;
 184         }
 185         if ((buf = malloc(len)) == NULL) {
 186                 warn("malloc %lu bytes", (u_long)len);
 187                 return;
 188         }
 189         if (sysctlbyname(mibvar, buf, &len, 0, 0) < 0) {
 190                 warn("sysctl: %s", mibvar);
 191                 free(buf);
 192                 return;
 193         }
 194
 195         /*
 196          * XXX this is better with a single PCB type
 197          */
 198         if (len == 0) {
 199                 free(buf);
 200                 return;
 201         }
 202         if (len < sizeof(size_t)) {
 203                 warnx("sysctl: short read");
 204                 free(buf);
 205                 return;
 206         }
 207         elem_len = *(size_t *)buf;
 208         len /= elem_len;
 209         buf2 = buf;
 210         for (i = 0; i < len; i++, buf2 += elem_len) {
 211                 if (*(size_t *)(buf2) != elem_len) {
 212                         warn("sysctl: inconsistent PCB len");
 213                         free(buf);
 214                         return;
 215                 }
 216                 enter_proto(buf2);
 217         }
 218         free(buf);
 219 }
 220
 221 void
 222 fetchnetstat(void)
 223 {
 224         register struct netinfo *p;
 225
 226         for (p = netcb.ni_forw; p != (struct netinfo *)&netcb; p = p->ni_forw)
 227                 p->ni_seen = 0;
 228         if (protos & TCP)
 229                 fetchnetstat_proto(enter_tcp, "net.inet.tcp.pcblist");
 230         if (protos & UDP)
 231                 fetchnetstat_proto(enter_udp, "net.inet.udp.pcblist");
 232 }
 233
 234 static void
 235 enter(struct inpcb *inp, struct xsocket *so, int state, const char *proto)
 236 {
 237         register struct netinfo *p;
 238
 239         if (!aflag && inet_lnaof(inp->inp_laddr) == INADDR_ANY)
 240                 return;
 241         if (nhosts && !checkhost(inp))
 242                 return;
 243         if (nports && !checkport(inp))
 244                 return;
 245         /*
 246          * pcblist may return non-ipv4 sockets, but at the moment
 247          * -netstat code doesn't support other than ipv4.
 248          */
 249         if ((inp->inp_vflag & INP_IPV4) == 0)
 250                 return;
 251         /*
 252          * Only take exact matches, any sockets with
 253          * previously unbound addresses will be deleted
 254          * below in the display routine because they
 255          * will appear as ``not seen'' in the kernel
 256          * data structures.
 257          */
 258         for (p = netcb.ni_forw; p != (struct netinfo *)&netcb; p = p->ni_forw) {
 259                 if (!streq(proto, p->ni_proto))
 260                         continue;
 261                 if (p->ni_lport != inp->inp_lport ||
 262                     p->ni_laddr.s_addr != inp->inp_laddr.s_addr)
 263                         continue;
 264                 if (p->ni_faddr.s_addr == inp->inp_faddr.s_addr &&
 265                     p->ni_fport == inp->inp_fport)
 266                         break;
 267         }
 268         if (p == (struct netinfo *)&netcb) {
 269                 if ((p = malloc(sizeof(*p))) == NULL) {
 270                         error("Out of memory");
 271                         return;
 272                 }
 273                 p->ni_prev = (struct netinfo *)&netcb;
 274                 p->ni_forw = netcb.ni_forw;
 275                 netcb.ni_forw->ni_prev = p;
 276                 netcb.ni_forw = p;
 277                 p->ni_line = -1;
 278                 p->ni_laddr = inp->inp_laddr;
 279                 p->ni_lport = inp->inp_lport;
 280                 p->ni_faddr = inp->inp_faddr;
 281                 p->ni_fport = inp->inp_fport;
 282                 p->ni_proto = proto;
 283                 p->ni_flags = NIF_LACHG|NIF_FACHG;
 284         }
 285         p->ni_rcvcc = so->so_rcv.sb_cc;
 286         p->ni_sndcc = so->so_snd.sb_cc;
 287         p->ni_state = state;
 288         p->ni_seen = 1;
 289 }
 290
 291 /* column locations */
 292 #define LADDR   0
 293 #define FADDR   LADDR+22
 294 #define CPUID   FADDR+22
 295 #define PROTO   CPUID+4
 296 #define RCVCC   PROTO+6
 297 #define SNDCC   RCVCC+7
 298 #define STATE   SNDCC+7
 299
 300
 301 void
 302 labelnetstat(void)
 303 {
 304         wmove(wnd, 0, 0); wclrtobot(wnd);
 305         mvwaddstr(wnd, 0, LADDR, "Local Address");
 306         mvwaddstr(wnd, 0, FADDR, "Foreign Address");
 307         mvwaddstr(wnd, 0, PROTO, "Proto");
 308         mvwaddstr(wnd, 0, RCVCC, "Recv-Q");
 309         mvwaddstr(wnd, 0, SNDCC, "Send-Q");
 310         mvwaddstr(wnd, 0, STATE, "(state)");
 311 }
 312
 313 void
 314 shownetstat(void)
 315 {
 316         register struct netinfo *p, *q;
 317
 318         /*
 319          * First, delete any connections that have gone
 320          * away and adjust the position of connections
 321          * below to reflect the deleted line.
 322          */
 323         p = netcb.ni_forw;
 324         while (p != (struct netinfo *)&netcb) {
 325                 if (p->ni_line == -1 || p->ni_seen) {
 326                         p = p->ni_forw;
 327                         continue;
 328                 }
 329                 wmove(wnd, p->ni_line, 0); wdeleteln(wnd);
 330                 q = netcb.ni_forw;
 331                 for (; q != (struct netinfo *)&netcb; q = q->ni_forw)
 332                         if (q != p && q->ni_line > p->ni_line) {
 333                                 q->ni_line--;
 334                                 /* this shouldn't be necessary */
 335                                 q->ni_flags |= NIF_LACHG|NIF_FACHG;
 336                         }
 337                 lastrow--;
 338                 q = p->ni_forw;
 339                 p->ni_prev->ni_forw = p->ni_forw;
 340                 p->ni_forw->ni_prev = p->ni_prev;
 341                 free(p);
 342                 p = q;
 343         }
 344         /*
 345          * Update existing connections and add new ones.
 346          */
 347         for (p = netcb.ni_forw; p != (struct netinfo *)&netcb; p = p->ni_forw) {
 348                 if (p->ni_line == -1) {
 349                         /*
 350                          * Add a new entry if possible.
 351                          */
 352                         if (lastrow > YMAX(wnd))
 353                                 continue;
 354                         p->ni_line = lastrow++;
 355                         p->ni_flags |= NIF_LACHG|NIF_FACHG;
 356                 }
 357                 if (p->ni_flags & NIF_LACHG) {
 358                         wmove(wnd, p->ni_line, LADDR);
 359                         inetprint(&p->ni_laddr, p->ni_lport, p->ni_proto);
 360                         p->ni_flags &= ~NIF_LACHG;
 361                 }
 362                 if (p->ni_flags & NIF_FACHG) {
 363                         wmove(wnd, p->ni_line, FADDR);
 364                         inetprint(&p->ni_faddr, p->ni_fport, p->ni_proto);
 365                         p->ni_flags &= ~NIF_FACHG;
 366                 }
 367                 mvwaddstr(wnd, p->ni_line, PROTO, p->ni_proto);
 368                 mvwprintw(wnd, p->ni_line, RCVCC, "%6d", p->ni_rcvcc);
 369                 mvwprintw(wnd, p->ni_line, SNDCC, "%6d", p->ni_sndcc);
 370                 if (streq(p->ni_proto, "tcp"))
 371                         if (p->ni_state < 0 || p->ni_state >= TCP_NSTATES)
 372                                 mvwprintw(wnd, p->ni_line, STATE, "%d",
 373                                     p->ni_state);
 374                         else
 375                                 mvwaddstr(wnd, p->ni_line, STATE,
 376                                     tcpstates[p->ni_state]);
 377                 wclrtoeol(wnd);
 378         }
 379         if (lastrow < YMAX(wnd)) {
 380                 wmove(wnd, lastrow, 0); wclrtobot(wnd);
 381                 wmove(wnd, YMAX(wnd), 0); wdeleteln(wnd);       /* XXX */
 382         }
 383 }
 384
 385 /*
 386  * Pretty print an Internet address (net address + port).
 387  * If the nflag was specified, use numbers instead of names.
 388  */
 389 static void
 390 inetprint(register struct in_addr *in, int port, const char *proto)
 391 {
 392         struct servent *sp = 0;
 393         char line[80], *cp;
 394
 395         snprintf(line, sizeof(line), "%.*s.", 16, inetname(*in));
 396         cp = strchr(line, '\0');
 397         if (!nflag && port)
 398                 sp = getservbyport(port, proto);
 399         if (sp || port == 0)
 400                 snprintf(cp, sizeof(line) - (cp - line), "%.8s",
 401                     sp ? sp->s_name : "*");
 402         else
 403                 snprintf(cp, sizeof(line) - (cp - line), "%d",
 404                     ntohs((u_short)port));
 405         /* pad to full column to clear any garbage */
 406         cp = strchr(line, '\0');
 407         while (cp - line < 22)
 408                 *cp++ = ' ';
 409         line[22] = '\0';
 410         waddstr(wnd, line);
 411 }
 412
 413 /*
 414  * Construct an Internet address representation.
 415  * If the nflag has been supplied, give
 416  * numeric value, otherwise try for symbolic name.
 417  */
 418 static char *
 419 inetname(struct in_addr in)
 420 {
 421         char *cp = 0;
 422         static char line[50];
 423         struct hostent *hp;
 424         struct netent *np;
 425
 426         if (!nflag && in.s_addr != INADDR_ANY) {
 427                 int net = inet_netof(in);
 428                 int lna = inet_lnaof(in);
 429
 430                 if (lna == INADDR_ANY) {
 431                         np = getnetbyaddr(net, AF_INET);
 432                         if (np)
 433                                 cp = np->n_name;
 434                 }
 435                 if (cp == 0) {
 436                         hp = gethostbyaddr((char *)&in, sizeof (in), AF_INET);
 437                         if (hp)
 438                                 cp = hp->h_name;
 439                 }
 440         }
 441         if (in.s_addr == INADDR_ANY)
 442                 strcpy(line, "*");
 443         else if (cp)
 444                 snprintf(line, sizeof(line), "%s", cp);
 445         else {
 446                 in.s_addr = ntohl(in.s_addr);
 447 #define C(x)    ((x) & 0xff)
 448                 snprintf(line, sizeof(line), "%u.%u.%u.%u", C(in.s_addr >> 24),
 449                         C(in.s_addr >> 16), C(in.s_addr >> 8), C(in.s_addr));
 450         }
 451         return (line);
 452 }
 453
 454 int
 455 cmdnetstat(char *cmd, char *args)
 456 {
 457         register struct netinfo *p;
 458
 459         if (prefix(cmd, "all")) {
 460                 aflag = !aflag;
 461                 goto fixup;
 462         }
 463         if  (prefix(cmd, "numbers") || prefix(cmd, "names")) {
 464                 int new;
 465
 466                 new = prefix(cmd, "numbers");
 467                 if (new == nflag)
 468                         return (1);
 469                 p = netcb.ni_forw;
 470                 for (; p != (struct netinfo *)&netcb; p = p->ni_forw) {
 471                         if (p->ni_line == -1)
 472                                 continue;
 473                         p->ni_flags |= NIF_LACHG|NIF_FACHG;
 474                 }
 475                 nflag = new;
 476                 goto redisplay;
 477         }
 478         if (!netcmd(cmd, args))
 479                 return (0);
 480 fixup:
 481         fetchnetstat();
 482 redisplay:
 483         shownetstat();
 484         refresh();
 485         return (1);
 486 }