usr.sbin/jls/jls.c

   1 /*-
   2  * Copyright (c) 2003 Mike Barcroft <mike@FreeBSD.org>
   3  * 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  *
  14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  24  * SUCH DAMAGE.
  25  *
  26  * $FreeBSD: src/usr.sbin/jls/jls.c,v 1.3 2003/04/22 13:24:56 mike Exp $
  27  * $DragonFly: src/usr.sbin/jls/jls.c,v 1.2 2006/12/29 18:02:57 victor Exp $
  28  */
  29
  30 #include <sys/param.h>
  31 #include <sys/sysctl.h>
  32
  33 #include <err.h>
  34 #include <errno.h>
  35 #include <limits.h>
  36 #include <stdio.h>
  37 #include <stdlib.h>
  38 #include <string.h>
  39
  40 #include <netinet/in.h>
  41 #include <arpa/inet.h>
  42
  43 int
  44 main(void)
  45 {
  46         size_t len;
  47         char *jls; /* Jail list */
  48         char *curpos;
  49         char *nextpos;
  50
  51         if (sysctlbyname("jail.list", NULL, &len, NULL, 0) == -1)
  52                 err(1, "sysctlbyname(): jail.list");
  53 retry:
  54         if (len == 0)
  55                 exit(0);
  56
  57         jls = malloc(len);
  58         if (jls == NULL)
  59                 err(1, "malloc failed");
  60
  61         if (sysctlbyname("jail.list", jls, &len, NULL, 0) == -1) {
  62                 if (errno == ENOMEM) {
  63                         free(jls);
  64                         goto retry;
  65                 }
  66                 err(1, "sysctlbyname(): jail.list");
  67         }
  68         printf("JID\tHostname\tPath\t\tIPs\n");
  69         curpos = jls;
  70         while (curpos) {
  71                 char *str_jid;
  72                 char *str_host;
  73                 char *str_path;
  74                 char *str_ips;
  75
  76                 nextpos = strchr(curpos, '\n');
  77                 if (nextpos)
  78                         *nextpos++ = 0;
  79                 str_jid = strtok(curpos, " ");
  80                 str_host = strtok(NULL, " ");
  81                 str_path = strtok(NULL, " ");
  82                 str_ips = strtok(NULL, "\n");
  83
  84                 printf("%-8s%-15s %-15s %s\n",
  85                         str_jid,
  86                         str_host,
  87                         str_path,
  88                         (str_ips ? str_ips : "(none)"));
  89                 curpos = nextpos;
  90         }
  91         free(jls);
  92         exit(0);
  93 }