1 /* $NetBSD: kvm_file.c,v 1.18 2001/11/05 15:01:49 lukem 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 1.18 2001/11/05 15:01:49 lukem 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/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 <sys/tty.h> 62 #include <nlist.h> 63 #include <kvm.h> 64 65 #include <uvm/uvm_extern.h> 66 67 #include <sys/sysctl.h> 68 69 #include <limits.h> 70 #include <ndbm.h> 71 #include <paths.h> 72 #include <string.h> 73 74 #include "kvm_private.h" 75 76 #define KREAD(kd, addr, obj) \ 77 (kvm_read(kd, (u_long) addr, obj, sizeof(*obj)) != sizeof(*obj)) 78 79 static int 80 kvm_deadfiles __P((kvm_t *, int, int, long, int)); 81 82 /* 83 * Get file structures. 84 */ 85 /*ARGSUSED*/ 86 static int 87 kvm_deadfiles(kd, op, arg, ofhead, numfiles) 88 kvm_t *kd; 89 int op, arg, numfiles; 90 long ofhead; 91 { 92 int buflen = kd->arglen, n = 0; 93 struct file *fp; 94 struct filelist fhead; 95 char *where = kd->argspc; 96 97 /* 98 * first copyout filehead 99 */ 100 if (buflen < sizeof(fhead) || 101 KREAD(kd, ofhead, &fhead)) { 102 _kvm_err(kd, kd->program, "can't read filehead"); 103 return (0); 104 } 105 buflen -= sizeof(fhead); 106 where += sizeof(fhead); 107 (void)memcpy(kd->argspc, &fhead, sizeof(fhead)); 108 109 /* 110 * followed by an array of file structures 111 */ 112 for (fp = fhead.lh_first; fp != 0; fp = fp->f_list.le_next) { 113 if (buflen > sizeof(struct file)) { 114 if (KREAD(kd, (long)fp, ((struct file *)(void *)where))) { 115 _kvm_err(kd, kd->program, "can't read kfp"); 116 return (0); 117 } 118 buflen -= sizeof(struct file); 119 fp = (struct file *)(void *)where; 120 where += sizeof(struct file); 121 n++; 122 } 123 } 124 if (n != numfiles) { 125 _kvm_err(kd, kd->program, "inconsistent nfiles"); 126 return (0); 127 } 128 return (numfiles); 129 } 130 131 char * 132 kvm_getfiles(kd, op, arg, cnt) 133 kvm_t *kd; 134 int op, arg; 135 int *cnt; 136 { 137 size_t size; 138 int mib[2], st; 139 int numfiles; 140 struct file *fp, *fplim; 141 struct filelist fhead; 142 143 if (ISSYSCTL(kd)) { 144 size = 0; 145 mib[0] = CTL_KERN; 146 mib[1] = KERN_FILE; 147 st = sysctl(mib, 2, NULL, &size, NULL, 0); 148 if (st == -1) { 149 _kvm_syserr(kd, kd->program, "kvm_getprocs"); 150 return (0); 151 } 152 if (kd->argspc == 0) 153 kd->argspc = (char *)_kvm_malloc(kd, size); 154 else if (kd->arglen < size) 155 kd->argspc = (char *)_kvm_realloc(kd, kd->argspc, size); 156 if (kd->argspc == 0) 157 return (0); 158 kd->arglen = size; 159 st = sysctl(mib, 2, kd->argspc, &size, NULL, 0); 160 if (st == -1 || size < sizeof(fhead)) { 161 _kvm_syserr(kd, kd->program, "kvm_getfiles"); 162 return (0); 163 } 164 (void)memcpy(&fhead, kd->argspc, sizeof(fhead)); 165 fp = (struct file *)(void *)(kd->argspc + sizeof(fhead)); 166 fplim = (struct file *)(void *)(kd->argspc + size); 167 for (numfiles = 0; fhead.lh_first && (fp < fplim); 168 numfiles++, fp++) 169 fhead.lh_first = fp->f_list.le_next; 170 } else { 171 struct nlist nl[3], *p; 172 173 nl[0].n_name = "_nfiles"; 174 nl[1].n_name = "_filehead"; 175 nl[2].n_name = 0; 176 177 if (kvm_nlist(kd, nl) != 0) { 178 for (p = nl; p->n_type != 0; ++p) 179 ; 180 _kvm_err(kd, kd->program, 181 "%s: no such symbol", p->n_name); 182 return (0); 183 } 184 if (KREAD(kd, nl[0].n_value, &numfiles)) { 185 _kvm_err(kd, kd->program, "can't read numfiles"); 186 return (0); 187 } 188 size = sizeof(fhead) + (numfiles + 10) * sizeof(struct file); 189 if (kd->argspc == 0) 190 kd->argspc = (char *)_kvm_malloc(kd, size); 191 else if (kd->arglen < size) 192 kd->argspc = (char *)_kvm_realloc(kd, kd->argspc, size); 193 if (kd->argspc == 0) 194 return (0); 195 kd->arglen = size; 196 numfiles = kvm_deadfiles(kd, op, arg, (long)nl[1].n_value, 197 numfiles); 198 if (numfiles == 0) 199 return (0); 200 } 201 *cnt = numfiles; 202 return (kd->argspc); 203 } 204