1 /* $NetBSD: kvm_file.c,v 1.22 2003/02/02 02:26:48 christos 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. All advertising materials mentioning features or use of this software 16 * must display the following acknowledgement: 17 * This product includes software developed by the University of 18 * California, Berkeley and its contributors. 19 * 4. Neither the name of the University nor the names of its contributors 20 * may be used to endorse or promote products derived from this software 21 * without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 */ 35 36 #include <sys/cdefs.h> 37 #if defined(LIBC_SCCS) && !defined(lint) 38 #if 0 39 static char sccsid[] = "@(#)kvm_file.c 8.1 (Berkeley) 6/4/93"; 40 #else 41 __RCSID("$NetBSD: kvm_file.c,v 1.22 2003/02/02 02:26:48 christos Exp $"); 42 #endif 43 #endif /* LIBC_SCCS and not lint */ 44 45 /* 46 * File list interface for kvm. pstat, fstat and netstat are 47 * users of this code, so we've factored it out into a separate module. 48 * Thus, we keep this grunge out of the other kvm applications (i.e., 49 * most other applications are interested only in open/close/read/nlist). 50 */ 51 52 #include <sys/param.h> 53 #include <sys/user.h> 54 #include <sys/lwp.h> 55 #include <sys/proc.h> 56 #include <sys/exec.h> 57 #define _KERNEL 58 #include <sys/file.h> 59 #undef _KERNEL 60 #include <sys/stat.h> 61 #include <sys/ioctl.h> 62 #include <sys/tty.h> 63 #include <nlist.h> 64 #include <kvm.h> 65 66 #include <uvm/uvm_extern.h> 67 68 #include <sys/sysctl.h> 69 70 #include <limits.h> 71 #include <ndbm.h> 72 #include <paths.h> 73 #include <string.h> 74 75 #include "kvm_private.h" 76 77 #define KREAD(kd, addr, obj) \ 78 (kvm_read(kd, (u_long) addr, obj, sizeof(*obj)) != sizeof(*obj)) 79 80 static int 81 kvm_deadfiles __P((kvm_t *, int, int, long, int)); 82 83 /* 84 * Get file structures. 85 */ 86 /*ARGSUSED*/ 87 static int 88 kvm_deadfiles(kd, op, arg, ofhead, numfiles) 89 kvm_t *kd; 90 int op, arg, numfiles; 91 long ofhead; 92 { 93 int buflen = kd->arglen, n = 0; 94 struct file *fp; 95 struct filelist fhead; 96 char *where = kd->argspc; 97 98 /* 99 * first copyout filehead 100 */ 101 if (buflen < sizeof(fhead) || 102 KREAD(kd, ofhead, &fhead)) { 103 _kvm_err(kd, kd->program, "can't read filehead"); 104 return (0); 105 } 106 buflen -= sizeof(fhead); 107 where += sizeof(fhead); 108 (void)memcpy(kd->argspc, &fhead, sizeof(fhead)); 109 110 /* 111 * followed by an array of file structures 112 */ 113 for (fp = fhead.lh_first; fp != 0; fp = fp->f_list.le_next) { 114 if (buflen > sizeof(struct file)) { 115 if (KREAD(kd, (long)fp, ((struct file *)(void *)where))) { 116 _kvm_err(kd, kd->program, "can't read kfp"); 117 return (0); 118 } 119 buflen -= sizeof(struct file); 120 fp = (struct file *)(void *)where; 121 where += sizeof(struct file); 122 n++; 123 } 124 } 125 if (n != numfiles) { 126 _kvm_err(kd, kd->program, "inconsistent nfiles"); 127 return (0); 128 } 129 return (numfiles); 130 } 131 132 char * 133 kvm_getfiles(kd, op, arg, cnt) 134 kvm_t *kd; 135 int op, arg; 136 int *cnt; 137 { 138 size_t size; 139 int mib[2], st; 140 int numfiles; 141 struct file *fp, *fplim; 142 struct filelist fhead; 143 144 if (ISSYSCTL(kd)) { 145 size = 0; 146 mib[0] = CTL_KERN; 147 mib[1] = KERN_FILE; 148 st = sysctl(mib, 2, NULL, &size, NULL, 0); 149 if (st == -1) { 150 _kvm_syserr(kd, kd->program, "kvm_getprocs"); 151 return (0); 152 } 153 if (kd->argspc == 0) 154 kd->argspc = (char *)_kvm_malloc(kd, size); 155 else if (kd->arglen < size) 156 kd->argspc = (char *)_kvm_realloc(kd, kd->argspc, size); 157 if (kd->argspc == 0) 158 return (0); 159 kd->arglen = size; 160 st = sysctl(mib, 2, kd->argspc, &size, NULL, 0); 161 if (st == -1 || size < sizeof(fhead)) { 162 _kvm_syserr(kd, kd->program, "kvm_getfiles"); 163 return (0); 164 } 165 (void)memcpy(&fhead, kd->argspc, sizeof(fhead)); 166 fp = (struct file *)(void *)(kd->argspc + sizeof(fhead)); 167 fplim = (struct file *)(void *)(kd->argspc + size); 168 for (numfiles = 0; fhead.lh_first && (fp < fplim); 169 numfiles++, fp++) 170 fhead.lh_first = fp->f_list.le_next; 171 } else { 172 struct nlist nl[3], *p; 173 174 nl[0].n_name = "_nfiles"; 175 nl[1].n_name = "_filehead"; 176 nl[2].n_name = 0; 177 178 if (kvm_nlist(kd, nl) != 0) { 179 for (p = nl; p->n_type != 0; ++p) 180 ; 181 _kvm_err(kd, kd->program, 182 "%s: no such symbol", p->n_name); 183 return (0); 184 } 185 if (KREAD(kd, nl[0].n_value, &numfiles)) { 186 _kvm_err(kd, kd->program, "can't read numfiles"); 187 return (0); 188 } 189 size = sizeof(fhead) + (numfiles + 10) * sizeof(struct file); 190 if (kd->argspc == 0) 191 kd->argspc = (char *)_kvm_malloc(kd, size); 192 else if (kd->arglen < size) 193 kd->argspc = (char *)_kvm_realloc(kd, kd->argspc, size); 194 if (kd->argspc == 0) 195 return (0); 196 kd->arglen = size; 197 numfiles = kvm_deadfiles(kd, op, arg, (long)nl[1].n_value, 198 numfiles); 199 if (numfiles == 0) 200 return (0); 201 } 202 *cnt = numfiles; 203 return (kd->argspc); 204 } 205