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 <strings.h>
  61 #include <kvm.h>
  62 #include "netstat.h"
  63
  64 static  void unixdomainpr(struct xunpcb *, struct xsocket *);
  65
  66 static  const char *const socktype[] =
  67     { "#0", "stream", "dgram", "raw", "rdm", "seqpacket" };
  68
  69 static int
  70 pcblist_sysctl(int type, char **bufp)
  71 {
  72         char    *buf;
  73         size_t  len;
  74         char mibvar[sizeof "net.local.seqpacket.pcblist"];
  75
  76         sprintf(mibvar, "net.local.%s.pcblist", socktype[type]);
  77
  78         len = 0;
  79         if (sysctlbyname(mibvar, 0, &len, 0, 0) < 0) {
  80                 if (errno != ENOENT)
  81                         warn("sysctl: %s", mibvar);
  82                 return (-1);
  83         }
  84         if ((buf = malloc(len)) == 0) {
  85                 warnx("malloc %lu bytes", (u_long)len);
  86                 return (-2);
  87         }
  88         if (sysctlbyname(mibvar, buf, &len, 0, 0) < 0) {
  89                 warn("sysctl: %s", mibvar);
  90                 free(buf);
  91                 return (-2);
  92         }
  93         *bufp = buf;
  94         return (0);
  95 }
  96
  97 static int
  98 pcblist_kvm(u_long count_off, u_long gencnt_off, u_long head_off, char **bufp)
  99 {
 100         struct unp_head head;
 101         struct unpcb *unp, unp_conn;
 102         u_char sun_len;
 103         struct socket so;
 104         struct xunpgen xug;
 105         struct xunpcb xu;
 106         unp_gen_t unp_gencnt;
 107         u_int   unp_count;
 108         char    *buf, *p;
 109         size_t  len;
 110
 111         if (count_off == 0 || gencnt_off == 0)
 112                 return (-2);
 113         if (head_off == 0)
 114                 return (-1);
 115         kread(count_off, &unp_count, sizeof(unp_count));
 116         len = 2 * sizeof(xug) + (unp_count + unp_count / 8) * sizeof(xu);
 117         if ((buf = malloc(len)) == 0) {
 118                 warnx("malloc %lu bytes", (u_long)len);
 119                 return (-2);
 120         }
 121         p = buf;
 122
 123 #define COPYOUT(obj, size) do {                                         \
 124         if (len < (size)) {                                             \
 125                 warnx("buffer size exceeded");                          \
 126                 goto fail;                                              \
 127         }                                                               \
 128         bcopy((obj), p, (size));                                        \
 129         len -= (size);                                                  \
 130         p += (size);                                                    \
 131 } while (0)
 132
 133 #define KREAD(off, buf, len) do {                                       \
 134         if (kread((uintptr_t)(off), (buf), (len)) != 0)                 \
 135                 goto fail;                                              \
 136 } while (0)
 137
 138         /* Write out header. */
 139         kread(gencnt_off, &unp_gencnt, sizeof(unp_gencnt));
 140         xug.xug_len = sizeof xug;
 141         xug.xug_count = unp_count;
 142         xug.xug_gen = unp_gencnt;
 143         xug.xug_sogen = 0;
 144         COPYOUT(&xug, sizeof xug);
 145
 146         /* Walk the PCB list. */
 147         xu.xu_len = sizeof xu;
 148         KREAD(head_off, &head, sizeof(head));
 149         LIST_FOREACH(unp, &head, unp_link) {
 150                 xu.xu_unpp = unp;
 151                 KREAD(unp, &xu.xu_unp, sizeof (*unp));
 152                 unp = &xu.xu_unp;
 153
 154                 if (unp->unp_gencnt > unp_gencnt)
 155                         continue;
 156                 if (unp->unp_addr != NULL) {
 157                         KREAD(unp->unp_addr, &sun_len, sizeof(sun_len));
 158                         KREAD(unp->unp_addr, &xu.xu_addr, sun_len);
 159                 }
 160                 if (unp->unp_conn != NULL) {
 161                         KREAD(unp->unp_conn, &unp_conn, sizeof(unp_conn));
 162                         if (unp_conn.unp_addr != NULL) {
 163                                 KREAD(unp_conn.unp_addr, &sun_len,
 164                                     sizeof(sun_len));
 165                                 KREAD(unp_conn.unp_addr, &xu.xu_caddr, sun_len);
 166                         }
 167                 }
 168                 KREAD(unp->unp_socket, &so, sizeof(so));
 169                 if (sotoxsocket(&so, &xu.xu_socket) != 0)
 170                         goto fail;
 171                 COPYOUT(&xu, sizeof(xu));
 172         }
 173
 174         /* Reread the counts and write the footer. */
 175         kread(count_off, &unp_count, sizeof(unp_count));
 176         kread(gencnt_off, &unp_gencnt, sizeof(unp_gencnt));
 177         xug.xug_count = unp_count;
 178         xug.xug_gen = unp_gencnt;
 179         COPYOUT(&xug, sizeof xug);
 180
 181         *bufp = buf;
 182         return (0);
 183
 184 fail:
 185         free(buf);
 186         return (-1);
 187 #undef COPYOUT
 188 #undef KREAD
 189 }
 190
 191 void
 192 unixpr(u_long count_off, u_long gencnt_off, u_long dhead_off, u_long shead_off,
 193     u_long sphead_off)
 194 {
 195         char    *buf;
 196         int     ret, type;
 197         struct  xsocket *so;
 198         struct  xunpgen *xug, *oxug;
 199         struct  xunpcb *xunp;
 200         u_long  head_off;
 201
 202         buf = NULL;
 203         for (type = SOCK_STREAM; type <= SOCK_SEQPACKET; type++) {
 204                 if (live)
 205                         ret = pcblist_sysctl(type, &buf);
 206                 else {
 207                         head_off = 0;
 208                         switch (type) {
 209                         case SOCK_STREAM:
 210                                 head_off = shead_off;
 211                                 break;
 212
 213                         case SOCK_DGRAM:
 214                                 head_off = dhead_off;
 215                                 break;
 216
 217                         case SOCK_SEQPACKET:
 218                                 head_off = sphead_off;
 219                                 break;
 220                         }
 221                         ret = pcblist_kvm(count_off, gencnt_off, head_off,
 222                             &buf);
 223                 }
 224                 if (ret == -1)
 225                         continue;
 226                 if (ret < 0)
 227                         return;
 228
 229                 oxug = xug = (struct xunpgen *)buf;
 230                 for (xug = (struct xunpgen *)((char *)xug + xug->xug_len);
 231                      xug->xug_len > sizeof(struct xunpgen);
 232                      xug = (struct xunpgen *)((char *)xug + xug->xug_len)) {
 233                         xunp = (struct xunpcb *)xug;
 234                         so = &xunp->xu_socket;
 235
 236                         /* Ignore PCBs which were freed during copyout. */
 237                         if (xunp->xu_unp.unp_gencnt > oxug->xug_gen)
 238                                 continue;
 239                         unixdomainpr(xunp, so);
 240                 }
 241                 if (xug != oxug && xug->xug_gen != oxug->xug_gen) {
 242                         if (oxug->xug_count > xug->xug_count) {
 243                                 printf("Some %s sockets may have been deleted.\n",
 244                                        socktype[type]);
 245                         } else if (oxug->xug_count < xug->xug_count) {
 246                                 printf("Some %s sockets may have been created.\n",
 247                                socktype[type]);
 248                         } else {
 249                                 printf("Some %s sockets may have been created or deleted",
 250                                socktype[type]);
 251                         }
 252                 }
 253                 free(buf);
 254         }
 255 }
 256
 257 static void
 258 unixdomainpr(struct xunpcb *xunp, struct xsocket *so)
 259 {
 260         struct unpcb *unp;
 261         struct sockaddr_un *sa;
 262         static int first = 1;
 263         char buf1[15];
 264
 265         unp = &xunp->xu_unp;
 266         if (unp->unp_addr)
 267                 sa = &xunp->xu_addr;
 268         else
 269                 sa = (struct sockaddr_un *)0;
 270
 271         if (first && !Lflag) {
 272                 printf("Active UNIX domain sockets\n");
 273                 printf(
 274 "%-8.8s %-6.6s %-6.6s %-6.6s %8.8s %8.8s %8.8s %8.8s Addr\n",
 275                     "Address", "Type", "Recv-Q", "Send-Q",
 276                     "Inode", "Conn", "Refs", "Nextref");
 277                 first = 0;
 278         }
 279
 280         if (Lflag && so->so_qlimit == 0)
 281                 return;
 282
 283         if (Lflag) {
 284                 snprintf(buf1, 15, "%d/%d/%d", so->so_qlen,
 285                     so->so_incqlen, so->so_qlimit);
 286                 printf("unix  %-14.14s", buf1);
 287         } else {
 288                 printf("%8lx %-6.6s %6u %6u %8lx %8lx %8lx %8lx",
 289                     (long)so->so_pcb, socktype[so->so_type], so->so_rcv.sb_cc,
 290                     so->so_snd.sb_cc, (long)unp->unp_vnode, (long)unp->unp_conn,
 291                     (long)LIST_FIRST(&unp->unp_refs),
 292                     (long)LIST_NEXT(unp, unp_reflink));
 293         }
 294         if (sa)
 295                 printf(" %.*s",
 296                     (int)(sa->sun_len - offsetof(struct sockaddr_un, sun_path)),
 297                     sa->sun_path);
 298         putchar('\n');
 299 }