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  * 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
  34 #if 0
  35 #ifndef lint
  36 static char sccsid[] = "@(#)unix.c      8.1 (Berkeley) 6/6/93";
  37 #endif /* not lint */
  38 #endif
  39
  40 #include <sys/cdefs.h>
  41 __FBSDID("$FreeBSD$");
  42
  43 /*
  44  * Display protocol blocks in the unix domain.
  45  */
  46 #include <sys/param.h>
  47 #include <sys/queue.h>
  48 #include <sys/protosw.h>
  49 #include <sys/socket.h>
  50 #include <sys/socketvar.h>
  51 #include <sys/mbuf.h>
  52 #include <sys/sysctl.h>
  53 #include <sys/un.h>
  54 #include <sys/unpcb.h>
  55
  56 #include <netinet/in.h>
  57
  58 #include <errno.h>
  59 #include <err.h>
  60 #include <stddef.h>
  61 #include <stdint.h>
  62 #include <stdio.h>
  63 #include <stdlib.h>
  64 #include <strings.h>
  65 #include <kvm.h>
  66 #include "netstat.h"
  67
  68 static  void unixdomainpr(struct xunpcb *, struct xsocket *);
  69
  70 static  const char *const socktype[] =
  71     { "#0", "stream", "dgram", "raw", "rdm", "seqpacket" };
  72
  73 static int
  74 pcblist_sysctl(int type, char **bufp)
  75 {
  76         char    *buf;
  77         size_t  len;
  78         char mibvar[sizeof "net.local.seqpacket.pcblist"];
  79
  80         sprintf(mibvar, "net.local.%s.pcblist", socktype[type]);
  81
  82         len = 0;
  83         if (sysctlbyname(mibvar, 0, &len, 0, 0) < 0) {
  84                 if (errno != ENOENT)
  85                         warn("sysctl: %s", mibvar);
  86                 return (-1);
  87         }
  88         if ((buf = malloc(len)) == 0) {
  89                 warnx("malloc %lu bytes", (u_long)len);
  90                 return (-2);
  91         }
  92         if (sysctlbyname(mibvar, buf, &len, 0, 0) < 0) {
  93                 warn("sysctl: %s", mibvar);
  94                 free(buf);
  95                 return (-2);
  96         }
  97         *bufp = buf;
  98         return (0);
  99 }
 100
 101 static int
 102 pcblist_kvm(u_long count_off, u_long gencnt_off, u_long head_off, char **bufp)
 103 {
 104         struct unp_head head;
 105         struct unpcb *unp, unp_conn;
 106         u_char sun_len;
 107         struct socket so;
 108         struct xunpgen xug;
 109         struct xunpcb xu;
 110         unp_gen_t unp_gencnt;
 111         u_int   unp_count;
 112         char    *buf, *p;
 113         size_t  len;
 114
 115         if (count_off == 0 || gencnt_off == 0)
 116                 return (-2);
 117         if (head_off == 0)
 118                 return (-1);
 119         kread(count_off, &unp_count, sizeof(unp_count));
 120         len = 2 * sizeof(xug) + (unp_count + unp_count / 8) * sizeof(xu);
 121         if ((buf = malloc(len)) == 0) {
 122                 warnx("malloc %lu bytes", (u_long)len);
 123                 return (-2);
 124         }
 125         p = buf;
 126
 127 #define COPYOUT(obj, size) do {                                         \
 128         if (len < (size)) {                                             \
 129                 warnx("buffer size exceeded");                          \
 130                 goto fail;                                              \
 131         }                                                               \
 132         bcopy((obj), p, (size));                                        \
 133         len -= (size);                                                  \
 134         p += (size);                                                    \
 135 } while (0)
 136
 137 #define KREAD(off, buf, len) do {                                       \
 138         if (kread((uintptr_t)(off), (buf), (len)) != 0)                 \
 139                 goto fail;                                              \
 140 } while (0)
 141
 142         /* Write out header. */
 143         kread(gencnt_off, &unp_gencnt, sizeof(unp_gencnt));
 144         xug.xug_len = sizeof xug;
 145         xug.xug_count = unp_count;
 146         xug.xug_gen = unp_gencnt;
 147         xug.xug_sogen = 0;
 148         COPYOUT(&xug, sizeof xug);
 149
 150         /* Walk the PCB list. */
 151         xu.xu_len = sizeof xu;
 152         KREAD(head_off, &head, sizeof(head));
 153         LIST_FOREACH(unp, &head, unp_link) {
 154                 xu.xu_unpp = unp;
 155                 KREAD(unp, &xu.xu_unp, sizeof (*unp));
 156                 unp = &xu.xu_unp;
 157
 158                 if (unp->unp_gencnt > unp_gencnt)
 159                         continue;
 160                 if (unp->unp_addr != NULL) {
 161                         KREAD(unp->unp_addr, &sun_len, sizeof(sun_len));
 162                         KREAD(unp->unp_addr, &xu.xu_addr, sun_len);
 163                 }
 164                 if (unp->unp_conn != NULL) {
 165                         KREAD(unp->unp_conn, &unp_conn, sizeof(unp_conn));
 166                         if (unp_conn.unp_addr != NULL) {
 167                                 KREAD(unp_conn.unp_addr, &sun_len,
 168                                     sizeof(sun_len));
 169                                 KREAD(unp_conn.unp_addr, &xu.xu_caddr, sun_len);
 170                         }
 171                 }
 172                 KREAD(unp->unp_socket, &so, sizeof(so));
 173                 if (sotoxsocket(&so, &xu.xu_socket) != 0)
 174                         goto fail;
 175                 COPYOUT(&xu, sizeof(xu));
 176         }
 177
 178         /* Reread the counts and write the footer. */
 179         kread(count_off, &unp_count, sizeof(unp_count));
 180         kread(gencnt_off, &unp_gencnt, sizeof(unp_gencnt));
 181         xug.xug_count = unp_count;
 182         xug.xug_gen = unp_gencnt;
 183         COPYOUT(&xug, sizeof xug);
 184
 185         *bufp = buf;
 186         return (0);
 187
 188 fail:
 189         free(buf);
 190         return (-1);
 191 #undef COPYOUT
 192 #undef KREAD
 193 }
 194
 195 void
 196 unixpr(u_long count_off, u_long gencnt_off, u_long dhead_off, u_long shead_off)
 197 {
 198         char    *buf;
 199         int     ret, type;
 200         struct  xsocket *so;
 201         struct  xunpgen *xug, *oxug;
 202         struct  xunpcb *xunp;
 203
 204         for (type = SOCK_STREAM; type <= SOCK_SEQPACKET; type++) {
 205                 if (live)
 206                         ret = pcblist_sysctl(type, &buf);
 207                 else
 208                         ret = pcblist_kvm(count_off, gencnt_off,
 209                             type == SOCK_STREAM ? shead_off :
 210                             (type == SOCK_DGRAM ? dhead_off : 0), &buf);
 211                 if (ret == -1)
 212                         continue;
 213                 if (ret < 0)
 214                         return;
 215
 216                 oxug = xug = (struct xunpgen *)buf;
 217                 for (xug = (struct xunpgen *)((char *)xug + xug->xug_len);
 218                      xug->xug_len > sizeof(struct xunpgen);
 219                      xug = (struct xunpgen *)((char *)xug + xug->xug_len)) {
 220                         xunp = (struct xunpcb *)xug;
 221                         so = &xunp->xu_socket;
 222
 223                         /* Ignore PCBs which were freed during copyout. */
 224                         if (xunp->xu_unp.unp_gencnt > oxug->xug_gen)
 225                                 continue;
 226                         unixdomainpr(xunp, so);
 227                 }
 228                 if (xug != oxug && xug->xug_gen != oxug->xug_gen) {
 229                         if (oxug->xug_count > xug->xug_count) {
 230                                 printf("Some %s sockets may have been deleted.\n",
 231                                        socktype[type]);
 232                         } else if (oxug->xug_count < xug->xug_count) {
 233                                 printf("Some %s sockets may have been created.\n",
 234                                socktype[type]);
 235                         } else {
 236                                 printf("Some %s sockets may have been created or deleted",
 237                                socktype[type]);
 238                         }
 239                 }
 240                 free(buf);
 241         }
 242 }
 243
 244 static void
 245 unixdomainpr(struct xunpcb *xunp, struct xsocket *so)
 246 {
 247         struct unpcb *unp;
 248         struct sockaddr_un *sa;
 249         static int first = 1;
 250         char buf1[15];
 251
 252         unp = &xunp->xu_unp;
 253         if (unp->unp_addr)
 254                 sa = &xunp->xu_addr;
 255         else
 256                 sa = (struct sockaddr_un *)0;
 257
 258         if (first && !Lflag) {
 259                 printf("Active UNIX domain sockets\n");
 260                 printf(
 261 "%-8.8s %-6.6s %-6.6s %-6.6s %8.8s %8.8s %8.8s %8.8s Addr\n",
 262                     "Address", "Type", "Recv-Q", "Send-Q",
 263                     "Inode", "Conn", "Refs", "Nextref");
 264                 first = 0;
 265         }
 266
 267         if (Lflag && so->so_qlimit == 0)
 268                 return;
 269
 270         if (Lflag) {
 271                 snprintf(buf1, 15, "%d/%d/%d", so->so_qlen,
 272                     so->so_incqlen, so->so_qlimit);
 273                 printf("unix  %-14.14s", buf1);
 274         } else {
 275                 printf("%8lx %-6.6s %6u %6u %8lx %8lx %8lx %8lx",
 276                     (long)so->so_pcb, socktype[so->so_type], so->so_rcv.sb_cc,
 277                     so->so_snd.sb_cc, (long)unp->unp_vnode, (long)unp->unp_conn,
 278                     (long)LIST_FIRST(&unp->unp_refs),
 279                     (long)LIST_NEXT(unp, unp_reflink));
 280         }
 281         if (sa)
 282                 printf(" %.*s",
 283                     (int)(sa->sun_len - offsetof(struct sockaddr_un, sun_path)),
 284                     sa->sun_path);
 285         putchar('\n');
 286 }