lib/libkvm/kvm_file.c

   1 /*      $NetBSD: kvm_file.c,v 1.25 2008/02/27 15:46:23 ad 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 1.25 2008/02/27 15:46:23 ad 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/user.h>
  53 #include <sys/lwp.h>
  54 #include <sys/proc.h>
  55 #include <sys/exec.h>
  56 #define _KERNEL
  57 #include <sys/file.h>
  58 #undef _KERNEL
  59 #include <sys/stat.h>
  60 #include <sys/ioctl.h>
  61 #include <nlist.h>
  62 #include <kvm.h>
  63
  64 #include <uvm/uvm_extern.h>
  65
  66 #include <sys/sysctl.h>
  67
  68 #include <limits.h>
  69 #include <ndbm.h>
  70 #include <paths.h>
  71 #include <string.h>
  72
  73 #include "kvm_private.h"
  74
  75 #define KREAD(kd, addr, obj) \
  76         (kvm_read(kd, (u_long) addr, obj, sizeof(*obj)) != sizeof(*obj))
  77
  78 static int
  79 kvm_deadfiles __P((kvm_t *, int, int, long, int));
  80
  81 /*
  82  * Get file structures.
  83  */
  84 /*ARGSUSED*/
  85 static int
  86 kvm_deadfiles(kd, op, arg, ofhead, numfiles)
  87         kvm_t *kd;
  88         int op, arg, numfiles;
  89         long ofhead;
  90 {
  91         size_t buflen = kd->argspc_len, n = 0;
  92         struct file *fp;
  93         struct filelist fhead;
  94         char *where = kd->argspc;
  95
  96         /*
  97          * first copyout filehead
  98          */
  99         if (buflen < sizeof(fhead) ||
 100             KREAD(kd, ofhead, &fhead)) {
 101                 _kvm_err(kd, kd->program, "can't read filehead");
 102                 return (0);
 103         }
 104         buflen -= sizeof(fhead);
 105         where += sizeof(fhead);
 106         (void)memcpy(kd->argspc, &fhead, sizeof(fhead));
 107
 108         /*
 109          * followed by an array of file structures
 110          */
 111         for (fp = fhead.lh_first; fp != 0; fp = fp->f_list.le_next) {
 112                 if (buflen > sizeof(struct file)) {
 113                         if (KREAD(kd, (long)fp, ((struct file *)(void *)where))) {
 114                                 _kvm_err(kd, kd->program, "can't read kfp");
 115                                 return (0);
 116                         }
 117                         buflen -= sizeof(struct file);
 118                         fp = (struct file *)(void *)where;
 119                         where += sizeof(struct file);
 120                         n++;
 121                 }
 122         }
 123         if (n != numfiles) {
 124                 _kvm_err(kd, kd->program, "inconsistent nfiles");
 125                 return (0);
 126         }
 127         return (numfiles);
 128 }
 129
 130 char *
 131 kvm_getfiles(kd, op, arg, cnt)
 132         kvm_t *kd;
 133         int op, arg;
 134         int *cnt;
 135 {
 136         size_t size;
 137         int mib[2], st;
 138         int numfiles;
 139         struct file *fp, *fplim;
 140         struct filelist fhead;
 141
 142         if (ISSYSCTL(kd)) {
 143                 size = 0;
 144                 mib[0] = CTL_KERN;
 145                 mib[1] = KERN_FILE;
 146                 st = sysctl(mib, 2, NULL, &size, NULL, 0);
 147                 if (st == -1) {
 148                         _kvm_syserr(kd, kd->program, "kvm_getprocs");
 149                         return (0);
 150                 }
 151                 KVM_ALLOC(kd, argspc, size);
 152                 st = sysctl(mib, 2, kd->argspc, &size, NULL, 0);
 153                 if (st == -1 || size < sizeof(fhead)) {
 154                         _kvm_syserr(kd, kd->program, "kvm_getfiles");
 155                         return (0);
 156                 }
 157                 (void)memcpy(&fhead, kd->argspc, sizeof(fhead));
 158                 fp = (struct file *)(void *)(kd->argspc + sizeof(fhead));
 159                 fplim = (struct file *)(void *)(kd->argspc + size);
 160                 for (numfiles = 0; fhead.lh_first && (fp < fplim);
 161                     numfiles++, fp++)
 162                         fhead.lh_first = fp->f_list.le_next;
 163         } else {
 164                 struct nlist nl[3], *p;
 165
 166                 nl[0].n_name = "_nfiles";
 167                 nl[1].n_name = "_filehead";
 168                 nl[2].n_name = 0;
 169
 170                 if (kvm_nlist(kd, nl) != 0) {
 171                         for (p = nl; p->n_type != 0; ++p)
 172                                 ;
 173                         _kvm_err(kd, kd->program,
 174                                  "%s: no such symbol", p->n_name);
 175                         return (0);
 176                 }
 177                 if (KREAD(kd, nl[0].n_value, &numfiles)) {
 178                         _kvm_err(kd, kd->program, "can't read numfiles");
 179                         return (0);
 180                 }
 181                 size = sizeof(fhead) + (numfiles + 10) * sizeof(struct file);
 182                 KVM_ALLOC(kd, argspc, size);
 183                 numfiles = kvm_deadfiles(kd, op, arg, (long)nl[1].n_value,
 184                     numfiles);
 185                 if (numfiles == 0)
 186                         return (0);
 187         }
 188         *cnt = numfiles;
 189         return (kd->argspc);
 190 }