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 35static 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#include <stdlib.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#define KREADN(kd, addr, obj, cnt) \ 72 (kvm_read(kd, addr, obj, (cnt)) != (ssize_t)(cnt)) 73 74/* 75 * Get file structures. 76 */ 77static int 78kvm_deadfiles(kvm_t *kd, int op __unused, int arg __unused, long allproc_o, 79 int nprocs __unused) 80{ 81 struct proc proc; 82 struct filedesc filed; 83 int buflen = kd->arglen, ocnt = 0, n = 0, once = 0, i; 84 struct file **ofiles; 85 struct file *fp; 86 struct proc *p; 87 char *where = kd->argspc; 88 89 if (buflen < (int)(sizeof(struct file *) + sizeof(struct file))) 90 return (0); 91 if (KREAD(kd, allproc_o, &p)) { 92 _kvm_err(kd, kd->program, "cannot read allproc"); 93 return (0); 94 } 95 for (; p != NULL; p = LIST_NEXT(&proc, p_list)) { 96 if (KREAD(kd, (u_long)p, &proc)) { 97 _kvm_err(kd, kd->program, "can't read proc at %p", p); 98 goto fail; 99 } 100 if (proc.p_state == PRS_NEW) 101 continue; 102 if (proc.p_fd == NULL) 103 continue; 104 if (KREAD(kd, (u_long)p->p_fd, &filed)) { 105 _kvm_err(kd, kd->program, "can't read filedesc at %p", 106 p->p_fd); 107 goto fail; 108 } 109 if (filed.fd_lastfile + 1 > ocnt) { 110 ocnt = filed.fd_lastfile + 1; 111 free(ofiles); 112 ofiles = (struct file **)_kvm_malloc(kd, 113 ocnt * sizeof(struct file *)); 114 if (ofiles == 0) 115 return (0); 116 } 117 if (KREADN(kd, (u_long)filed.fd_ofiles, ofiles, 118 ocnt * sizeof(struct file *))) { 119 _kvm_err(kd, kd->program, "can't read ofiles at %p", 120 filed.fd_ofiles); 121 return (0); 122 } 123 for (i = 0; i <= filed.fd_lastfile; i++) { 124 if ((fp = ofiles[i]) == NULL) 125 continue; 126 /* 127 * copyout filehead (legacy) 128 */ 129 if (!once) { 130 *(struct file **)kd->argspc = fp; 131 *(struct file **)where = fp; 132 buflen -= sizeof (fp); 133 where += sizeof (fp); 134 once = 1; 135 } 136 if (buflen < (int)sizeof(struct file)) 137 goto fail; 138 if (KREAD(kd, (long)fp, ((struct file *)where))) { 139 _kvm_err(kd, kd->program, "can't read kfp"); 140 goto fail; 141 } 142 buflen -= sizeof (struct file); 143 fp = (struct file *)where; 144 where += sizeof (struct file); 145 n++; 146 } 147 } 148 free(ofiles); 149 return (n); 150fail: 151 free(ofiles); 152 return (0); 153 154} 155 156char * 157kvm_getfiles(kvm_t *kd, int op, int arg, int *cnt) 158{ 159 int mib[2], st, n, nfiles, nprocs; 160 size_t size; 161 162 _kvm_syserr(kd, kd->program, "kvm_getfiles has been broken for years"); 163 return (0); 164 if (ISALIVE(kd)) { 165 size = 0; 166 mib[0] = CTL_KERN; 167 mib[1] = KERN_FILE; 168 st = sysctl(mib, 2, NULL, &size, NULL, 0); 169 if (st == -1) { 170 _kvm_syserr(kd, kd->program, "kvm_getfiles"); 171 return (0); 172 } 173 if (kd->argspc == 0) 174 kd->argspc = (char *)_kvm_malloc(kd, size); 175 else if (kd->arglen < (int)size) 176 kd->argspc = (char *)_kvm_realloc(kd, kd->argspc, size); 177 if (kd->argspc == 0) 178 return (0); 179 kd->arglen = size; 180 st = sysctl(mib, 2, kd->argspc, &size, NULL, 0); 181 if (st != 0) { 182 _kvm_syserr(kd, kd->program, "kvm_getfiles"); 183 return (0); 184 } 185 nfiles = size / sizeof(struct xfile); 186 } else { 187 struct nlist nl[4], *p; 188 189 nl[0].n_name = "_allproc"; 190 nl[1].n_name = "_nprocs"; 191 nl[2].n_name = "_nfiles"; 192 nl[3].n_name = 0; 193 194 if (kvm_nlist(kd, nl) != 0) { 195 for (p = nl; p->n_type != 0; ++p) 196 ; 197 _kvm_err(kd, kd->program, 198 "%s: no such symbol", p->n_name); 199 return (0); 200 } 201 if (KREAD(kd, nl[1].n_value, &nprocs)) { 202 _kvm_err(kd, kd->program, "can't read nprocs"); 203 return (0); 204 } 205 if (KREAD(kd, nl[2].n_value, &nfiles)) { 206 _kvm_err(kd, kd->program, "can't read nfiles"); 207 return (0); 208 } 209 size = sizeof(void *) + (nfiles + 10) * sizeof(struct file); 210 if (kd->argspc == 0) 211 kd->argspc = (char *)_kvm_malloc(kd, size); 212 else if (kd->arglen < (int)size) 213 kd->argspc = (char *)_kvm_realloc(kd, kd->argspc, size); 214 if (kd->argspc == 0) 215 return (0); 216 kd->arglen = size; 217 n = kvm_deadfiles(kd, op, arg, nl[0].n_value, nprocs); 218 if (n != nfiles) { 219 _kvm_err(kd, kd->program, "inconsistant nfiles"); 220 return (0); 221 } 222 nfiles = n; 223 } 224 *cnt = nfiles; 225 return (kd->argspc); 226} 227