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. 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 } 178