usr.bin/netstat/unix.c

   1 /*-
   2  * Copyright (c) 1983, 1988, 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 #if 0
  31 #ifndef lint
  32 static char sccsid[] = "@(#)unix.c      8.1 (Berkeley) 6/6/93";
  33 #endif /* not lint */
  34 #endif
  35
  36 #include <sys/cdefs.h>
  37 __FBSDID("$FreeBSD$");
  38
  39 /*
  40  * Display protocol blocks in the unix domain.
  41  */
  42 #include <sys/param.h>
  43 #include <sys/queue.h>
  44 #include <sys/protosw.h>
  45 #include <sys/socket.h>
  46 #include <sys/socketvar.h>
  47 #include <sys/mbuf.h>
  48 #include <sys/sysctl.h>
  49 #include <sys/un.h>
  50 #include <sys/unpcb.h>
  51
  52 #include <netinet/in.h>
  53
  54 #include <errno.h>
  55 #include <err.h>
  56 #include <stddef.h>
  57 #include <stdint.h>
  58 #include <stdio.h>
  59 #include <stdlib.h>
  60 #include <stdbool.h>
  61 #include <strings.h>
  62 #include <kvm.h>
  63 #include <libxo/xo.h>
  64 #include "netstat.h"
  65
  66 static  void unixdomainpr(struct xunpcb *, struct xsocket *);
  67
  68 static  const char *const socktype[] =
  69     { "#0", "stream", "dgram", "raw", "rdm", "seqpacket" };
  70
  71 static int
  72 pcblist_sysctl(int type, char **bufp)
  73 {
  74         char    *buf;
  75         size_t  len;
  76         char mibvar[sizeof "net.local.seqpacket.pcblist"];
  77
  78         snprintf(mibvar, sizeof(mibvar), "net.local.%s.pcblist", socktype[type]);
  79
  80         len = 0;
  81         if (sysctlbyname(mibvar, 0, &len, 0, 0) < 0) {
  82                 if (errno != ENOENT)
  83                         xo_warn("sysctl: %s", mibvar);
  84                 return (-1);
  85         }
  86         if ((buf = malloc(len)) == NULL) {
  87                 xo_warnx("malloc %lu bytes", (u_long)len);
  88                 return (-2);
  89         }
  90         if (sysctlbyname(mibvar, buf, &len, 0, 0) < 0) {
  91                 xo_warn("sysctl: %s", mibvar);
  92                 free(buf);
  93                 return (-2);
  94         }
  95         *bufp = buf;
  96         return (0);
  97 }
  98
  99 static int
 100 pcblist_kvm(u_long count_off, u_long gencnt_off, u_long head_off, char **bufp)
 101 {
 102         struct unp_head head;
 103         struct unpcb *unp, unp_conn;
 104         u_char sun_len;
 105         struct socket so;
 106         struct xunpgen xug;
 107         struct xunpcb xu;
 108         unp_gen_t unp_gencnt;
 109         u_int   unp_count;
 110         char    *buf, *p;
 111         size_t  len;
 112
 113         if (count_off == 0 || gencnt_off == 0)
 114                 return (-2);
 115         if (head_off == 0)
 116                 return (-1);
 117         kread(count_off, &unp_count, sizeof(unp_count));
 118         len = 2 * sizeof(xug) + (unp_count + unp_count / 8) * sizeof(xu);
 119         if ((buf = malloc(len)) == NULL) {
 120                 xo_warnx("malloc %lu bytes", (u_long)len);
 121                 return (-2);
 122         }
 123         p = buf;
 124
 125 #define COPYOUT(obj, size) do {                                         \
 126         if (len < (size)) {                                             \
 127                 xo_warnx("buffer size exceeded");                       \
 128                 goto fail;                                              \
 129         }                                                               \
 130         bcopy((obj), p, (size));                                        \
 131         len -= (size);                                                  \
 132         p += (size);                                                    \
 133 } while (0)
 134
 135 #define KREAD(off, buf, len) do {                                       \
 136         if (kread((uintptr_t)(off), (buf), (len)) != 0)                 \
 137                 goto fail;                                              \
 138 } while (0)
 139
 140         /* Write out header. */
 141         kread(gencnt_off, &unp_gencnt, sizeof(unp_gencnt));
 142         xug.xug_len = sizeof xug;
 143         xug.xug_count = unp_count;
 144         xug.xug_gen = unp_gencnt;
 145         xug.xug_sogen = 0;
 146         COPYOUT(&xug, sizeof xug);
 147
 148         /* Walk the PCB list. */
 149         xu.xu_len = sizeof xu;
 150         KREAD(head_off, &head, sizeof(head));
 151         LIST_FOREACH(unp, &head, unp_link) {
 152                 xu.xu_unpp = unp;
 153                 KREAD(unp, &xu.xu_unp, sizeof (*unp));
 154                 unp = &xu.xu_unp;
 155
 156                 if (unp->unp_gencnt > unp_gencnt)
 157                         continue;
 158                 if (unp->unp_addr != NULL) {
 159                         KREAD(unp->unp_addr, &sun_len, sizeof(sun_len));
 160                         KREAD(unp->unp_addr, &xu.xu_addr, sun_len);
 161                 }
 162                 if (unp->unp_conn != NULL) {
 163                         KREAD(unp->unp_conn, &unp_conn, sizeof(unp_conn));
 164                         if (unp_conn.unp_addr != NULL) {
 165                                 KREAD(unp_conn.unp_addr, &sun_len,
 166                                     sizeof(sun_len));
 167                                 KREAD(unp_conn.unp_addr, &xu.xu_caddr, sun_len);
 168                         }
 169                 }
 170                 KREAD(unp->unp_socket, &so, sizeof(so));
 171                 if (sotoxsocket(&so, &xu.xu_socket) != 0)
 172                         goto fail;
 173                 COPYOUT(&xu, sizeof(xu));
 174         }
 175
 176         /* Reread the counts and write the footer. */
 177         kread(count_off, &unp_count, sizeof(unp_count));
 178         kread(gencnt_off, &unp_gencnt, sizeof(unp_gencnt));
 179         xug.xug_count = unp_count;
 180         xug.xug_gen = unp_gencnt;
 181         COPYOUT(&xug, sizeof xug);
 182
 183         *bufp = buf;
 184         return (0);
 185
 186 fail:
 187         free(buf);
 188         return (-1);
 189 #undef COPYOUT
 190 #undef KREAD
 191 }
 192
 193 void
 194 unixpr(u_long count_off, u_long gencnt_off, u_long dhead_off, u_long shead_off,
 195     u_long sphead_off, bool *first)
 196 {
 197         char    *buf;
 198         int     ret, type;
 199         struct  xsocket *so;
 200         struct  xunpgen *xug, *oxug;
 201         struct  xunpcb *xunp;
 202         u_long  head_off;
 203
 204         buf = NULL;
 205         for (type = SOCK_STREAM; type <= SOCK_SEQPACKET; type++) {
 206                 if (live)
 207                         ret = pcblist_sysctl(type, &buf);
 208                 else {
 209                         head_off = 0;
 210                         switch (type) {
 211                         case SOCK_STREAM:
 212                                 head_off = shead_off;
 213                                 break;
 214
 215                         case SOCK_DGRAM:
 216                                 head_off = dhead_off;
 217                                 break;
 218
 219                         case SOCK_SEQPACKET:
 220                                 head_off = sphead_off;
 221                                 break;
 222                         }
 223                         ret = pcblist_kvm(count_off, gencnt_off, head_off,
 224                             &buf);
 225                 }
 226                 if (ret == -1)
 227                         continue;
 228                 if (ret < 0)
 229                         return;
 230
 231                 oxug = xug = (struct xunpgen *)buf;
 232                 for (xug = (struct xunpgen *)((char *)xug + xug->xug_len);
 233                     xug->xug_len > sizeof(struct xunpgen);
 234                     xug = (struct xunpgen *)((char *)xug + xug->xug_len)) {
 235                         xunp = (struct xunpcb *)xug;
 236                         so = &xunp->xu_socket;
 237
 238                         /* Ignore PCBs which were freed during copyout. */
 239                         if (xunp->xu_unp.unp_gencnt > oxug->xug_gen)
 240                                 continue;
 241                         if (*first) {
 242                                 xo_open_list("socket");
 243                                 *first = false;
 244                         }
 245                         xo_open_instance("socket");
 246                         unixdomainpr(xunp, so);
 247                         xo_close_instance("socket");
 248                 }
 249                 if (xug != oxug && xug->xug_gen != oxug->xug_gen) {
 250                         if (oxug->xug_count > xug->xug_count) {
 251                                 xo_emit("Some {:type/%s} sockets may have "
 252                                     "been {:action/deleted}.\n",
 253                                     socktype[type]);
 254                         } else if (oxug->xug_count < xug->xug_count) {
 255                                 xo_emit("Some {:type/%s} sockets may have "
 256                                     "been {:action/created}.\n",
 257                                     socktype[type]);
 258                         } else {
 259                                 xo_emit("Some {:type/%s} sockets may have "
 260                                     "been {:action/created or deleted}",
 261                                     socktype[type]);
 262                         }
 263                 }
 264                 free(buf);
 265         }
 266 }
 267
 268 static void
 269 unixdomainpr(struct xunpcb *xunp, struct xsocket *so)
 270 {
 271         struct unpcb *unp;
 272         struct sockaddr_un *sa;
 273         static int first = 1;
 274         char buf1[33];
 275         static const char *titles[2] = {
 276             "{T:/%-8.8s} {T:/%-6.6s} {T:/%-6.6s} {T:/%-6.6s} {T:/%8.8s} "
 277             "{T:/%8.8s} {T:/%8.8s} {T:/%8.8s} {T:Addr}\n",
 278             "{T:/%-16.16s} {T:/%-6.6s} {T:/%-6.6s} {T:/%-6.6s} {T:/%16.16s} "
 279             "{T:/%16.16s} {T:/%16.16s} {T:/%16.16s} {T:Addr}\n"
 280         };
 281         static const char *format[2] = {
 282             "{q:address/%8lx} {t:type/%-6.6s} "
 283             "{:receive-bytes-waiting/%6u} "
 284             "{:send-bytes-waiting/%6u} "
 285             "{q:vnode/%8lx} {q:connection/%8lx} "
 286             "{q:first-reference/%8lx} {q:next-reference/%8lx}",
 287             "{q:address/%16lx} {t:type/%-6.6s} "
 288             "{:receive-bytes-waiting/%6u} "
 289             "{:send-bytes-waiting/%6u} "
 290             "{q:vnode/%16lx} {q:connection/%16lx} "
 291             "{q:first-reference/%16lx} {q:next-reference/%16lx}"
 292         };
 293         int fmt = (sizeof(void *) == 8) ? 1 : 0;
 294
 295         unp = &xunp->xu_unp;
 296         if (unp->unp_addr)
 297                 sa = &xunp->xu_addr;
 298         else
 299                 sa = (struct sockaddr_un *)0;
 300
 301         if (first && !Lflag) {
 302                 xo_emit("{T:Active UNIX domain sockets}\n");
 303                 xo_emit(titles[fmt],
 304                     "Address", "Type", "Recv-Q", "Send-Q",
 305                     "Inode", "Conn", "Refs", "Nextref");
 306                 first = 0;
 307         }
 308
 309         if (Lflag && so->so_qlimit == 0)
 310                 return;
 311
 312         if (Lflag) {
 313                 snprintf(buf1, sizeof buf1, "%u/%u/%u", so->so_qlen,
 314                     so->so_incqlen, so->so_qlimit);
 315                 xo_emit("unix  {d:socket/%-32.32s}{e:queue-length/%u}"
 316                     "{e:incomplete-queue-length/%u}{e:queue-limit/%u}",
 317                     buf1, so->so_qlen, so->so_incqlen, so->so_qlimit);
 318         } else {
 319                 xo_emit(format[fmt],
 320                     (long)so->so_pcb, socktype[so->so_type], so->so_rcv.sb_cc,
 321                     so->so_snd.sb_cc, (long)unp->unp_vnode,
 322                     (long)unp->unp_conn,
 323                     (long)LIST_FIRST(&unp->unp_refs),
 324                     (long)LIST_NEXT(unp, unp_reflink));
 325         }
 326         if (sa)
 327                 xo_emit(" {:path/%.*s}",
 328                     (int)(sa->sun_len - offsetof(struct sockaddr_un, sun_path)),
 329                     sa->sun_path);
 330         xo_emit("\n");
 331 }