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 (ISALIVE(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 } 183