1 /* $NetBSD: kvm_file.c,v 1.29 2014/02/19 20:21:22 dsl 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. Neither the name of the University nor the names of its contributors
16 * may be used to endorse or promote products derived from this software
17 * without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 */
31
32 #include <sys/cdefs.h>
33 #if defined(LIBC_SCCS) && !defined(lint)
34 #if 0
35 static char sccsid[] = "@(#)kvm_file.c 8.1 (Berkeley) 6/4/93";
36 #else
37 __RCSID("$NetBSD: kvm_file.c,v 1.29 2014/02/19 20:21:22 dsl Exp $");
38 #endif
39 #endif /* LIBC_SCCS and not lint */
40
41 /*
42 * File list interface for kvm. pstat, fstat and netstat are
43 * users of this code, so we've factored it out into a separate module.
44 * Thus, we keep this grunge out of the other kvm applications (i.e.,
45 * most other applications are interested only in open/close/read/nlist).
46 */
47
48 #define _KERNEL
49 #include <sys/types.h>
50 #undef _KERNEL
51 #include <sys/param.h>
52 #include <sys/lwp.h>
53 #include <sys/proc.h>
54 #include <sys/exec.h>
55 #define _KERNEL
56 #include <sys/file.h>
57 #undef _KERNEL
58 #include <sys/stat.h>
59 #include <sys/ioctl.h>
60 #include <nlist.h>
61 #include <kvm.h>
62
63 #include <uvm/uvm_extern.h>
64
65 #include <sys/sysctl.h>
66
67 #include <limits.h>
68 #include <ndbm.h>
69 #include <paths.h>
70 #include <string.h>
71
72 #include "kvm_private.h"
73
74 static int
75 kvm_deadfiles(kvm_t *, int, int, long, int);
76
77 /*
78 * Get file structures.
79 */
80 /*ARGSUSED*/
81 static int
kvm_deadfiles(kvm_t * kd,int op,int arg,long ofhead,int numfiles)82 kvm_deadfiles(kvm_t *kd, int op, int arg, long ofhead, int numfiles)
83 {
84 size_t buflen = kd->argspc_len, n = 0;
85 struct file *fp;
86 struct filelist fhead;
87 char *where = kd->argspc;
88
89 /*
90 * first copyout filehead
91 */
92 if (buflen < sizeof(fhead) ||
93 KREAD(kd, (u_long)ofhead, &fhead)) {
94 _kvm_err(kd, kd->program, "can't read filehead");
95 return (0);
96 }
97 buflen -= sizeof(fhead);
98 where += sizeof(fhead);
99 (void)memcpy(kd->argspc, &fhead, sizeof(fhead));
100
101 /*
102 * followed by an array of file structures
103 */
104 for (fp = fhead.lh_first; fp != 0; fp = fp->f_list.le_next) {
105 if (buflen > sizeof(struct file)) {
106 if (KREAD(kd, (u_long)fp,
107 ((struct file *)(void *)where))) {
108 _kvm_err(kd, kd->program, "can't read kfp");
109 return (0);
110 }
111 buflen -= sizeof(struct file);
112 fp = (struct file *)(void *)where;
113 where += sizeof(struct file);
114 n++;
115 }
116 }
117 if (n != numfiles) {
118 _kvm_err(kd, kd->program, "inconsistent nfiles");
119 return (0);
120 }
121 return (numfiles);
122 }
123
124 char *
kvm_getfiles(kvm_t * kd,int op,int arg,int * cnt)125 kvm_getfiles(kvm_t *kd, int op, int arg, int *cnt)
126 {
127 size_t size;
128 int mib[2], st;
129 int numfiles;
130 struct file *fp, *fplim;
131 struct filelist fhead;
132
133 if (ISSYSCTL(kd)) {
134 size = 0;
135 mib[0] = CTL_KERN;
136 mib[1] = KERN_FILE;
137 st = sysctl(mib, 2, NULL, &size, NULL, 0);
138 if (st == -1) {
139 _kvm_syserr(kd, kd->program, "kvm_getprocs");
140 return (0);
141 }
142 KVM_ALLOC(kd, argspc, size);
143 st = sysctl(mib, 2, kd->argspc, &size, NULL, 0);
144 if (st == -1 || size < sizeof(fhead)) {
145 _kvm_syserr(kd, kd->program, "kvm_getfiles");
146 return (0);
147 }
148 (void)memcpy(&fhead, kd->argspc, sizeof(fhead));
149 fp = (struct file *)(void *)(kd->argspc + sizeof(fhead));
150 fplim = (struct file *)(void *)(kd->argspc + size);
151 for (numfiles = 0; fhead.lh_first && (fp < fplim);
152 numfiles++, fp++)
153 fhead.lh_first = fp->f_list.le_next;
154 } else {
155 struct nlist nl[3], *p;
156
157 nl[0].n_name = "_nfiles";
158 nl[1].n_name = "_filehead";
159 nl[2].n_name = 0;
160
161 if (kvm_nlist(kd, nl) != 0) {
162 for (p = nl; p->n_type != 0; ++p)
163 ;
164 _kvm_err(kd, kd->program,
165 "%s: no such symbol", p->n_name);
166 return (0);
167 }
168 if (KREAD(kd, nl[0].n_value, &numfiles)) {
169 _kvm_err(kd, kd->program, "can't read numfiles");
170 return (0);
171 }
172 size = sizeof(fhead) + (numfiles + 10) * sizeof(struct file);
173 KVM_ALLOC(kd, argspc, size);
174 numfiles = kvm_deadfiles(kd, op, arg, (long)nl[1].n_value,
175 numfiles);
176 if (numfiles == 0)
177 return (0);
178 }
179 *cnt = numfiles;
180 return (kd->argspc);
181 }
182