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
  30 #include <sys/cdefs.h>
  31 __FBSDID("$FreeBSD$");
  32
  33 #if defined(LIBC_SCCS) && !defined(lint)
  34 #if 0
  35 static char sccsid[] = "@(#)kvm_file.c  8.1 (Berkeley) 6/4/93";
  36 #endif
  37 #endif /* LIBC_SCCS and not lint */
  38
  39 /*
  40  * File list interface for kvm.  pstat, fstat and netstat are
  41  * users of this code, so we've factored it out into a separate module.
  42  * Thus, we keep this grunge out of the other kvm applications (i.e.,
  43  * most other applications are interested only in open/close/read/nlist).
  44  */
  45
  46 #include <sys/param.h>
  47 #include <sys/user.h>
  48 #include <sys/proc.h>
  49 #define _WANT_FILE      /* make file.h give us 'struct file' */
  50 #include <sys/file.h>
  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
  59 #include <sys/sysctl.h>
  60
  61 #include <limits.h>
  62 #include <ndbm.h>
  63 #include <paths.h>
  64
  65 #include "kvm_private.h"
  66
  67 #define KREAD(kd, addr, obj) \
  68         (kvm_read(kd, addr, obj, sizeof(*obj)) != sizeof(*obj))
  69
  70 #define KREADN(kd, addr, obj, cnt) \
  71         (kvm_read(kd, addr, obj, (cnt)) != (cnt))
  72
  73 /*
  74  * Get file structures.
  75  */
  76 static int
  77 kvm_deadfiles(kd, op, arg, allproc_o, nprocs)
  78         kvm_t *kd;
  79         int op, arg, nprocs;
  80         long allproc_o;
  81 {
  82         struct proc proc;
  83         struct filedesc filed;
  84         int buflen = kd->arglen, ocnt = 0, n = 0, once = 0, i;
  85         struct file **ofiles;
  86         struct file *fp;
  87         struct proc *p;
  88         char *where = kd->argspc;
  89
  90         if (buflen < sizeof (struct file *) + sizeof (struct file))
  91                 return (0);
  92         if (KREAD(kd, allproc_o, &p)) {
  93                 _kvm_err(kd, kd->program, "cannot read allproc");
  94                 return (0);
  95         }
  96         for (; p != NULL; p = LIST_NEXT(&proc, p_list)) {
  97                 if (KREAD(kd, (u_long)p, &proc)) {
  98                         _kvm_err(kd, kd->program, "can't read proc at %x", p);
  99                         goto fail;
 100                 }
 101                 if (proc.p_state == PRS_NEW)
 102                         continue;
 103                 if (proc.p_fd == NULL)
 104                         continue;
 105                 if (KREAD(kd, (u_long)p->p_fd, &filed)) {
 106                         _kvm_err(kd, kd->program, "can't read filedesc at %x",
 107                             p->p_fd);
 108                         goto fail;
 109                 }
 110                 if (filed.fd_lastfile + 1 > ocnt) {
 111                         ocnt = filed.fd_lastfile + 1;
 112                         free(ofiles);
 113                         ofiles = (struct file **)_kvm_malloc(kd,
 114                                 ocnt * sizeof(struct file *));
 115                         if (ofiles == 0)
 116                                 return (0);
 117                 }
 118                 if (KREADN(kd, (u_long)filed.fd_ofiles, ofiles,
 119                     ocnt * sizeof(struct file *))) {
 120                         _kvm_err(kd, kd->program, "can't read ofiles at %x",
 121                             filed.fd_ofiles);
 122                         return (0);
 123                 }
 124                 for (i = 0; i <= filed.fd_lastfile; i++) {
 125                         if ((fp = ofiles[i]) == NULL)
 126                                 continue;
 127                         /*
 128                          * copyout filehead (legacy)
 129                          */
 130                         if (!once) {
 131                                 *(struct file **)kd->argspc = fp;
 132                                 *(struct file **)where = fp;
 133                                 buflen -= sizeof (fp);
 134                                 where += sizeof (fp);
 135                                 once = 1;
 136                         }
 137                         if (buflen < sizeof (struct file))
 138                                 goto fail;
 139                         if (KREAD(kd, (long)fp, ((struct file *)where))) {
 140                                 _kvm_err(kd, kd->program, "can't read kfp");
 141                                 goto fail;
 142                         }
 143                         buflen -= sizeof (struct file);
 144                         fp = (struct file *)where;
 145                         where += sizeof (struct file);
 146                         n++;
 147                 }
 148         }
 149         free(ofiles);
 150         return (n);
 151 fail:
 152         free(ofiles);
 153         return (0);
 154
 155 }
 156
 157 char *
 158 kvm_getfiles(kd, op, arg, cnt)
 159         kvm_t *kd;
 160         int op, arg;
 161         int *cnt;
 162 {
 163         int mib[2], st, n, nfiles, nprocs;
 164         size_t size;
 165
 166         _kvm_syserr(kd, kd->program, "kvm_getfiles has been broken for years");
 167         return (0);
 168         if (ISALIVE(kd)) {
 169                 size = 0;
 170                 mib[0] = CTL_KERN;
 171                 mib[1] = KERN_FILE;
 172                 st = sysctl(mib, 2, NULL, &size, NULL, 0);
 173                 if (st == -1) {
 174                         _kvm_syserr(kd, kd->program, "kvm_getfiles");
 175                         return (0);
 176                 }
 177                 if (kd->argspc == 0)
 178                         kd->argspc = (char *)_kvm_malloc(kd, size);
 179                 else if (kd->arglen < size)
 180                         kd->argspc = (char *)_kvm_realloc(kd, kd->argspc, size);
 181                 if (kd->argspc == 0)
 182                         return (0);
 183                 kd->arglen = size;
 184                 st = sysctl(mib, 2, kd->argspc, &size, NULL, 0);
 185                 if (st != 0) {
 186                         _kvm_syserr(kd, kd->program, "kvm_getfiles");
 187                         return (0);
 188                 }
 189                 nfiles = size / sizeof(struct xfile);
 190         } else {
 191                 struct nlist nl[4], *p;
 192
 193                 nl[0].n_name = "_allproc";
 194                 nl[1].n_name = "_nprocs";
 195                 nl[2].n_name = "_nfiles";
 196                 nl[3].n_name = 0;
 197
 198                 if (kvm_nlist(kd, nl) != 0) {
 199                         for (p = nl; p->n_type != 0; ++p)
 200                                 ;
 201                         _kvm_err(kd, kd->program,
 202                                  "%s: no such symbol", p->n_name);
 203                         return (0);
 204                 }
 205                 if (KREAD(kd, nl[1].n_value, &nprocs)) {
 206                         _kvm_err(kd, kd->program, "can't read nprocs");
 207                         return (0);
 208                 }
 209                 if (KREAD(kd, nl[2].n_value, &nfiles)) {
 210                         _kvm_err(kd, kd->program, "can't read nfiles");
 211                         return (0);
 212                 }
 213                 size = sizeof(void *) + (nfiles + 10) * sizeof(struct file);
 214                 if (kd->argspc == 0)
 215                         kd->argspc = (char *)_kvm_malloc(kd, size);
 216                 else if (kd->arglen < size)
 217                         kd->argspc = (char *)_kvm_realloc(kd, kd->argspc, size);
 218                 if (kd->argspc == 0)
 219                         return (0);
 220                 kd->arglen = size;
 221                 n = kvm_deadfiles(kd, op, arg, nl[0].n_value, nprocs);
 222                 if (n != nfiles) {
 223                         _kvm_err(kd, kd->program, "inconsistant nfiles");
 224                         return (0);
 225                 }
 226                 nfiles = n;
 227         }
 228         *cnt = nfiles;
 229         return (kd->argspc);
 230 }