lib/libkvm/kvm_file.c

   1 /*-
   2  * Copyright (c) 1989, 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  * 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  * @(#)kvm_file.c       8.1 (Berkeley) 6/4/93
  30  * $FreeBSD: src/lib/libkvm/kvm_file.c,v 1.11 2000/02/18 16:39:00 peter Exp $
  31  */
  32
  33 /*
  34  * File list interface for kvm.  pstat, fstat and netstat are
  35  * users of this code, so we've factored it out into a separate module.
  36  * Thus, we keep this grunge out of the other kvm applications (i.e.,
  37  * most other applications are interested only in open/close/read/nlist).
  38  */
  39
  40 #include <sys/user.h>   /* MUST BE FIRST */
  41 #include <sys/param.h>
  42 #include <sys/proc.h>
  43 #define _KERNEL
  44 #include <sys/file.h>
  45 #undef _KERNEL
  46 #include <sys/stat.h>
  47 #include <sys/ioctl.h>
  48 #include <nlist.h>
  49 #include <kvm.h>
  50
  51 #include <vm/vm.h>
  52 #include <vm/vm_param.h>
  53 #include <vm/swap_pager.h>
  54
  55 #include <sys/sysctl.h>
  56
  57 #include <limits.h>
  58 #include <ndbm.h>
  59 #include <paths.h>
  60
  61 #include "kvm_private.h"
  62
  63 #define KREAD(kd, addr, obj) \
  64         (kvm_read(kd, addr, obj, sizeof(*obj)) != sizeof(*obj))
  65
  66 /*
  67  * Get file structures.
  68  */
  69 static int
  70 kvm_deadfiles(kvm_t *kd, int op, int arg, long filehead_o, int nfiles)
  71 {
  72         int buflen = kd->arglen, n = 0;
  73         struct file *fp;
  74         char *where = kd->argspc;
  75         struct filelist filehead;
  76
  77         /*
  78          * first copyout filehead
  79          */
  80         if (buflen > sizeof (filehead)) {
  81                 if (KREAD(kd, filehead_o, &filehead)) {
  82                         _kvm_err(kd, kd->program, "can't read filehead");
  83                         return (0);
  84                 }
  85                 buflen -= sizeof (filehead);
  86                 where += sizeof (filehead);
  87                 *(struct filelist *)kd->argspc = filehead;
  88         }
  89         /*
  90          * followed by an array of file structures
  91          */
  92         for (fp = filehead.lh_first; fp != NULL; fp = fp->f_list.le_next) {
  93                 if (buflen > sizeof (struct file)) {
  94                         if (KREAD(kd, (long)fp, ((struct file *)where))) {
  95                                 _kvm_err(kd, kd->program, "can't read kfp");
  96                                 return (0);
  97                         }
  98                         buflen -= sizeof (struct file);
  99                         fp = (struct file *)where;
 100                         where += sizeof (struct file);
 101                         n++;
 102                 }
 103         }
 104         if (n != nfiles) {
 105                 _kvm_err(kd, kd->program, "inconsistent nfiles");
 106                 return (0);
 107         }
 108         return (nfiles);
 109 }
 110
 111 char *
 112 kvm_getfiles(kvm_t *kd, int op, int arg, int *cnt)
 113 {
 114         int mib[2], st, nfiles;
 115         size_t size;
 116         struct file *fp, *fplim;
 117         struct filelist filehead;
 118
 119         if (kvm_ishost(kd)) {
 120                 size = 0;
 121                 mib[0] = CTL_KERN;
 122                 mib[1] = KERN_FILE;
 123                 st = sysctl(mib, 2, NULL, &size, NULL, 0);
 124                 if (st == -1) {
 125                         _kvm_syserr(kd, kd->program, "kvm_getfiles");
 126                         return (0);
 127                 }
 128                 if (kd->argspc == 0)
 129                         kd->argspc = (char *)_kvm_malloc(kd, size);
 130                 else if (kd->arglen < size)
 131                         kd->argspc = (char *)_kvm_realloc(kd, kd->argspc, size);
 132                 if (kd->argspc == 0)
 133                         return (0);
 134                 kd->arglen = size;
 135                 st = sysctl(mib, 2, kd->argspc, &size, NULL, 0);
 136                 if (st == -1 || size < sizeof(filehead)) {
 137                         _kvm_syserr(kd, kd->program, "kvm_getfiles");
 138                         return (0);
 139                 }
 140                 filehead = *(struct filelist *)kd->argspc;
 141                 fp = (struct file *)(kd->argspc + sizeof (filehead));
 142                 fplim = (struct file *)(kd->argspc + size);
 143                 for (nfiles = 0; filehead.lh_first && (fp < fplim); nfiles++, fp++)
 144                         filehead.lh_first = fp->f_list.le_next;
 145         } else {
 146                 struct nlist nl[3], *p;
 147
 148                 nl[0].n_name = "_filehead";
 149                 nl[1].n_name = "_nfiles";
 150                 nl[2].n_name = 0;
 151
 152                 if (kvm_nlist(kd, nl) != 0) {
 153                         for (p = nl; p->n_type != 0; ++p)
 154                                 ;
 155                         _kvm_err(kd, kd->program,
 156                                  "%s: no such symbol", p->n_name);
 157                         return (0);
 158                 }
 159                 if (KREAD(kd, nl[0].n_value, &nfiles)) {
 160                         _kvm_err(kd, kd->program, "can't read nfiles");
 161                         return (0);
 162                 }
 163                 size = sizeof(filehead) + (nfiles + 10) * sizeof(struct file);
 164                 if (kd->argspc == 0)
 165                         kd->argspc = (char *)_kvm_malloc(kd, size);
 166                 else if (kd->arglen < size)
 167                         kd->argspc = (char *)_kvm_realloc(kd, kd->argspc, size);
 168                 if (kd->argspc == 0)
 169                         return (0);
 170                 kd->arglen = size;
 171                 nfiles = kvm_deadfiles(kd, op, arg, nl[1].n_value, nfiles);
 172                 if (nfiles == 0)
 173                         return (0);
 174         }
 175         *cnt = nfiles;
 176         return (kd->argspc);
 177 }