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/* $FreeBSD$ */
/*
* Copyright (C) 1993-2001 by Darren Reed.
*
* See the IPFILTER.LICENCE file for details on licencing.
*/
/*
* kmemcpy() - copies n bytes from kernel memory into user buffer.
* returns 0 on success, -1 on error.
*/
#include <stdio.h>
#include <sys/param.h>
#include <sys/types.h>
#include <sys/uio.h>
#include <unistd.h>
#include <string.h>
#include <fcntl.h>
#include <sys/file.h>
#if !defined(__sgi) && !defined(__hpux) && !defined(__osf__) && !defined(linux)
#include <kvm.h>
#endif
#include <fcntl.h>
#include <sys/socket.h>
#include <sys/ioctl.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <netinet/in_systm.h>
#include <netinet/ip.h>
#include <net/if.h>
#if __FreeBSD_version >= 300000
# include <net/if_var.h>
#endif
#if defined(linux) || defined(__osf__) || defined(__sgi) || defined(__hpux)
# include <stdlib.h>
#endif
#include "kmem.h"
#ifndef __STDC__
# define const
#endif
#if !defined(lint)
static const char sccsid[] = "@(#)kmem.c 1.4 1/12/96 (C) 1992 Darren Reed";
static const char rcsid[] = "@(#)Id: kmem.c,v 1.16.2.1 2004/06/20 10:25:58 darrenr Exp";
#endif
#if !defined(__sgi) && !defined(__hpux) && !defined(__osf__) && !defined(linux)
/*
* For all platforms where there is a libkvm and a kvm_t, we use that...
*/
static kvm_t *kvm_f = NULL;
#else
/*
*...and for the others (HP-UX, IRIX, Tru64), we have to provide our own.
*/
typedef int * kvm_t;
static kvm_t kvm_f = NULL;
static char *kvm_errstr = NULL;
kvm_t kvm_open __P((char *, char *, char *, int, char *));
int kvm_read __P((kvm_t, u_long, char *, size_t));
kvm_t kvm_open(kernel, core, swap, mode, errstr)
char *kernel, *core, *swap;
int mode;
char *errstr;
{
kvm_t k;
int fd;
kvm_errstr = errstr;
if (core == NULL)
core = "/dev/kmem";
fd = open(core, mode);
if (fd == -1)
return NULL;
k = malloc(sizeof(*k));
if (k == NULL)
return NULL;
*k = fd;
return k;
}
int kvm_read(kvm, pos, buffer, size)
kvm_t kvm;
u_long pos;
char *buffer;
size_t size;
{
int r = 0, left;
char *bufp;
if (lseek(*kvm, pos, 0) == -1) {
if (kvm_errstr != NULL) {
fprintf(stderr, "%s", kvm_errstr);
perror("lseek");
}
return -1;
}
for (bufp = buffer, left = size; left > 0; bufp += r, left -= r) {
r = read(*kvm, bufp, left);
#ifdef __osf__
/*
* Tru64 returns "0" for successful operation, not the number
* of bytes read.
*/
if (r == 0)
r = left;
#endif
if (r <= 0)
return -1;
}
return r;
}
#endif /* !defined(__sgi) && !defined(__hpux) && !defined(__osf__) */
int openkmem(kern, core)
char *kern, *core;
{
kvm_f = kvm_open(kern, core, NULL, O_RDONLY, NULL);
if (kvm_f == NULL)
{
perror("openkmem:open");
return -1;
}
return kvm_f != NULL;
}
int kmemcpy(buf, pos, n)
register char *buf;
long pos;
register int n;
{
register int r;
if (!n)
return 0;
if (kvm_f == NULL)
if (openkmem(NULL, NULL) == -1)
return -1;
while ((r = kvm_read(kvm_f, pos, buf, n)) < n)
if (r <= 0)
{
fprintf(stderr, "pos=0x%lx ", (u_long)pos);
perror("kmemcpy:read");
return -1;
}
else
{
buf += r;
pos += r;
n -= r;
}
return 0;
}
int kstrncpy(buf, pos, n)
register char *buf;
long pos;
register int n;
{
register int r;
if (!n)
return 0;
if (kvm_f == NULL)
if (openkmem(NULL, NULL) == -1)
return -1;
while (n > 0)
{
r = kvm_read(kvm_f, pos, buf, 1);
if (r <= 0)
{
fprintf(stderr, "pos=0x%lx ", (u_long)pos);
perror("kmemcpy:read");
return -1;
}
else
{
if (*buf == '\0')
break;
buf++;
pos++;
n--;
}
}
return 0;
}
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