lib/libkvm/kvm_file.c

   1 /*      $NetBSD: kvm_file.c,v 1.29 2014/02/19 20:21:22 dsl Exp $        */
   2
   3 /*-
   4  * Copyright (c) 1989, 1992, 1993
   5  *      The Regents of the University of California.  All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  * 3. Neither the name of the University nor the names of its contributors
  16  *    may be used to endorse or promote products derived from this software
  17  *    without specific prior written permission.
  18  *
  19  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  29  * SUCH DAMAGE.
  30  */
  31
  32 #include <sys/cdefs.h>
  33 #if defined(LIBC_SCCS) && !defined(lint)
  34 #if 0
  35 static char sccsid[] = "@(#)kvm_file.c  8.1 (Berkeley) 6/4/93";
  36 #else
  37 __RCSID("$NetBSD: kvm_file.c,v 1.29 2014/02/19 20:21:22 dsl Exp $");
  38 #endif
  39 #endif /* LIBC_SCCS and not lint */
  40
  41 /*
  42  * File list interface for kvm.  pstat, fstat and netstat are
  43  * users of this code, so we've factored it out into a separate module.
  44  * Thus, we keep this grunge out of the other kvm applications (i.e.,
  45  * most other applications are interested only in open/close/read/nlist).
  46  */
  47
  48 #define _KERNEL
  49 #include <sys/types.h>
  50 #undef _KERNEL
  51 #include <sys/param.h>
  52 #include <sys/lwp.h>
  53 #include <sys/proc.h>
  54 #include <sys/exec.h>
  55 #define _KERNEL
  56 #include <sys/file.h>
  57 #undef _KERNEL
  58 #include <sys/stat.h>
  59 #include <sys/ioctl.h>
  60 #include <nlist.h>
  61 #include <kvm.h>
  62
  63 #include <uvm/uvm_extern.h>
  64
  65 #include <sys/sysctl.h>
  66
  67 #include <limits.h>
  68 #include <ndbm.h>
  69 #include <paths.h>
  70 #include <string.h>
  71
  72 #include "kvm_private.h"
  73
  74 static int
  75 kvm_deadfiles(kvm_t *, int, int, long, int);
  76
  77 /*
  78  * Get file structures.
  79  */
  80 /*ARGSUSED*/
  81 static int
  82 kvm_deadfiles(kvm_t *kd, int op, int arg, long ofhead, int numfiles)
  83 {
  84         size_t buflen = kd->argspc_len, n = 0;
  85         struct file *fp;
  86         struct filelist fhead;
  87         char *where = kd->argspc;
  88
  89         /*
  90          * first copyout filehead
  91          */
  92         if (buflen < sizeof(fhead) ||
  93             KREAD(kd, (u_long)ofhead, &fhead)) {
  94                 _kvm_err(kd, kd->program, "can't read filehead");
  95                 return (0);
  96         }
  97         buflen -= sizeof(fhead);
  98         where += sizeof(fhead);
  99         (void)memcpy(kd->argspc, &fhead, sizeof(fhead));
 100
 101         /*
 102          * followed by an array of file structures
 103          */
 104         for (fp = fhead.lh_first; fp != 0; fp = fp->f_list.le_next) {
 105                 if (buflen > sizeof(struct file)) {
 106                         if (KREAD(kd, (u_long)fp,
 107                             ((struct file *)(void *)where))) {
 108                                 _kvm_err(kd, kd->program, "can't read kfp");
 109                                 return (0);
 110                         }
 111                         buflen -= sizeof(struct file);
 112                         fp = (struct file *)(void *)where;
 113                         where += sizeof(struct file);
 114                         n++;
 115                 }
 116         }
 117         if (n != numfiles) {
 118                 _kvm_err(kd, kd->program, "inconsistent nfiles");
 119                 return (0);
 120         }
 121         return (numfiles);
 122 }
 123
 124 char *
 125 kvm_getfiles(kvm_t *kd, int op, int arg, int *cnt)
 126 {
 127         size_t size;
 128         int mib[2], st;
 129         int numfiles;
 130         struct file *fp, *fplim;
 131         struct filelist fhead;
 132
 133         if (ISSYSCTL(kd)) {
 134                 size = 0;
 135                 mib[0] = CTL_KERN;
 136                 mib[1] = KERN_FILE;
 137                 st = sysctl(mib, 2, NULL, &size, NULL, 0);
 138                 if (st == -1) {
 139                         _kvm_syserr(kd, kd->program, "kvm_getprocs");
 140                         return (0);
 141                 }
 142                 KVM_ALLOC(kd, argspc, size);
 143                 st = sysctl(mib, 2, kd->argspc, &size, NULL, 0);
 144                 if (st == -1 || size < sizeof(fhead)) {
 145                         _kvm_syserr(kd, kd->program, "kvm_getfiles");
 146                         return (0);
 147                 }
 148                 (void)memcpy(&fhead, kd->argspc, sizeof(fhead));
 149                 fp = (struct file *)(void *)(kd->argspc + sizeof(fhead));
 150                 fplim = (struct file *)(void *)(kd->argspc + size);
 151                 for (numfiles = 0; fhead.lh_first && (fp < fplim);
 152                     numfiles++, fp++)
 153                         fhead.lh_first = fp->f_list.le_next;
 154         } else {
 155                 struct nlist nl[3], *p;
 156
 157                 nl[0].n_name = "_nfiles";
 158                 nl[1].n_name = "_filehead";
 159                 nl[2].n_name = 0;
 160
 161                 if (kvm_nlist(kd, nl) != 0) {
 162                         for (p = nl; p->n_type != 0; ++p)
 163                                 ;
 164                         _kvm_err(kd, kd->program,
 165                                  "%s: no such symbol", p->n_name);
 166                         return (0);
 167                 }
 168                 if (KREAD(kd, nl[0].n_value, &numfiles)) {
 169                         _kvm_err(kd, kd->program, "can't read numfiles");
 170                         return (0);
 171                 }
 172                 size = sizeof(fhead) + (numfiles + 10) * sizeof(struct file);
 173                 KVM_ALLOC(kd, argspc, size);
 174                 numfiles = kvm_deadfiles(kd, op, arg, (long)nl[1].n_value,
 175                     numfiles);
 176                 if (numfiles == 0)
 177                         return (0);
 178         }
 179         *cnt = numfiles;
 180         return (kd->argspc);
 181 }