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  * 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  * @(#)kvm_file.c       8.1 (Berkeley) 6/4/93
  34  * $FreeBSD: src/lib/libkvm/kvm_file.c,v 1.11 2000/02/18 16:39:00 peter Exp $
  35  * $DragonFly: src/lib/libkvm/kvm_file.c,v 1.5 2007/05/13 18:33:56 swildner Exp $
  36  */
  37
  38 /*
  39  * File list interface for kvm.  pstat, fstat and netstat are
  40  * users of this code, so we've factored it out into a separate module.
  41  * Thus, we keep this grunge out of the other kvm applications (i.e.,
  42  * most other applications are interested only in open/close/read/nlist).
  43  */
  44
  45 #include <sys/user.h>   /* MUST BE FIRST */
  46 #include <sys/param.h>
  47 #include <sys/proc.h>
  48 #define _KERNEL
  49 #include <sys/file.h>
  50 #undef _KERNEL
  51 #include <sys/stat.h>
  52 #include <sys/ioctl.h>
  53 #include <nlist.h>
  54 #include <kvm.h>
  55
  56 #include <vm/vm.h>
  57 #include <vm/vm_param.h>
  58 #include <vm/swap_pager.h>
  59
  60 #include <sys/sysctl.h>
  61
  62 #include <limits.h>
  63 #include <ndbm.h>
  64 #include <paths.h>
  65
  66 #include "kvm_private.h"
  67
  68 #define KREAD(kd, addr, obj) \
  69         (kvm_read(kd, addr, obj, sizeof(*obj)) != sizeof(*obj))
  70
  71 /*
  72  * Get file structures.
  73  */
  74 static int
  75 kvm_deadfiles(kvm_t *kd, int op, int arg, long filehead_o, int nfiles)
  76 {
  77         int buflen = kd->arglen, n = 0;
  78         struct file *fp;
  79         char *where = kd->argspc;
  80         struct filelist filehead;
  81
  82         /*
  83          * first copyout filehead
  84          */
  85         if (buflen > sizeof (filehead)) {
  86                 if (KREAD(kd, filehead_o, &filehead)) {
  87                         _kvm_err(kd, kd->program, "can't read filehead");
  88                         return (0);
  89                 }
  90                 buflen -= sizeof (filehead);
  91                 where += sizeof (filehead);
  92                 *(struct filelist *)kd->argspc = filehead;
  93         }
  94         /*
  95          * followed by an array of file structures
  96          */
  97         for (fp = filehead.lh_first; fp != 0; fp = fp->f_list.le_next) {
  98                 if (buflen > sizeof (struct file)) {
  99                         if (KREAD(kd, (long)fp, ((struct file *)where))) {
 100                                 _kvm_err(kd, kd->program, "can't read kfp");
 101                                 return (0);
 102                         }
 103                         buflen -= sizeof (struct file);
 104                         fp = (struct file *)where;
 105                         where += sizeof (struct file);
 106                         n++;
 107                 }
 108         }
 109         if (n != nfiles) {
 110                 _kvm_err(kd, kd->program, "inconsistent nfiles");
 111                 return (0);
 112         }
 113         return (nfiles);
 114 }
 115
 116 char *
 117 kvm_getfiles(kvm_t *kd, int op, int arg, int *cnt)
 118 {
 119         int mib[2], st, nfiles;
 120         size_t size;
 121         struct file *fp, *fplim;
 122         struct filelist filehead;
 123
 124         if (kvm_ishost(kd)) {
 125                 size = 0;
 126                 mib[0] = CTL_KERN;
 127                 mib[1] = KERN_FILE;
 128                 st = sysctl(mib, 2, NULL, &size, NULL, 0);
 129                 if (st == -1) {
 130                         _kvm_syserr(kd, kd->program, "kvm_getfiles");
 131                         return (0);
 132                 }
 133                 if (kd->argspc == 0)
 134                         kd->argspc = (char *)_kvm_malloc(kd, size);
 135                 else if (kd->arglen < size)
 136                         kd->argspc = (char *)_kvm_realloc(kd, kd->argspc, size);
 137                 if (kd->argspc == 0)
 138                         return (0);
 139                 kd->arglen = size;
 140                 st = sysctl(mib, 2, kd->argspc, &size, NULL, 0);
 141                 if (st == -1 || size < sizeof(filehead)) {
 142                         _kvm_syserr(kd, kd->program, "kvm_getfiles");
 143                         return (0);
 144                 }
 145                 filehead = *(struct filelist *)kd->argspc;
 146                 fp = (struct file *)(kd->argspc + sizeof (filehead));
 147                 fplim = (struct file *)(kd->argspc + size);
 148                 for (nfiles = 0; filehead.lh_first && (fp < fplim); nfiles++, fp++)
 149                         filehead.lh_first = fp->f_list.le_next;
 150         } else {
 151                 struct nlist nl[3], *p;
 152
 153                 nl[0].n_name = "_filehead";
 154                 nl[1].n_name = "_nfiles";
 155                 nl[2].n_name = 0;
 156
 157                 if (kvm_nlist(kd, nl) != 0) {
 158                         for (p = nl; p->n_type != 0; ++p)
 159                                 ;
 160                         _kvm_err(kd, kd->program,
 161                                  "%s: no such symbol", p->n_name);
 162                         return (0);
 163                 }
 164                 if (KREAD(kd, nl[0].n_value, &nfiles)) {
 165                         _kvm_err(kd, kd->program, "can't read nfiles");
 166                         return (0);
 167                 }
 168                 size = sizeof(filehead) + (nfiles + 10) * sizeof(struct file);
 169                 if (kd->argspc == 0)
 170                         kd->argspc = (char *)_kvm_malloc(kd, size);
 171                 else if (kd->arglen < size)
 172                         kd->argspc = (char *)_kvm_realloc(kd, kd->argspc, size);
 173                 if (kd->argspc == 0)
 174                         return (0);
 175                 kd->arglen = size;
 176                 nfiles = kvm_deadfiles(kd, op, arg, nl[1].n_value, nfiles);
 177                 if (nfiles == 0)
 178                         return (0);
 179         }
 180         *cnt = nfiles;
 181         return (kd->argspc);
 182 }