44bc301921
Reported by: jrtc27
Fixes: 2582ae5740
MFC after: 1 month
115 lines
1.8 KiB
C
115 lines
1.8 KiB
C
/* $FreeBSD$ */
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/*
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* Copyright (C) 2012 by Darren Reed.
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*
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* See the IPFILTER.LICENCE file for details on licencing.
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*/
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/*
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* kmemcpy() - copies n bytes from kernel memory into user buffer.
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* returns 0 on success, -1 on error.
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*/
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#include <stdio.h>
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#include <sys/param.h>
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#include <sys/types.h>
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#include <sys/uio.h>
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#include <unistd.h>
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#include <string.h>
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#include <fcntl.h>
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#include <sys/file.h>
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#include <kvm.h>
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#include <fcntl.h>
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#include <sys/socket.h>
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#include <sys/ioctl.h>
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#include <netinet/in.h>
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#include <arpa/inet.h>
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#include <netinet/in_systm.h>
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#include <netinet/ip.h>
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#include <net/if.h>
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#include "kmem.h"
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#if !defined(lint)
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static const char sccsid[] = "@(#)kmem.c 1.4 1/12/96 (C) 1992 Darren Reed";
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static const char rcsid[] = "@(#)$Id$";
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#endif
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static kvm_t *kvm_f = NULL;
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int
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openkmem(char *kern, char *core)
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{
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kvm_f = kvm_open(kern, core, NULL, O_RDONLY, NULL);
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if (kvm_f == NULL)
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{
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perror("openkmem:open");
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return (-1);
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}
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return (kvm_f != NULL);
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}
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int
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kmemcpy(register char *buf, long pos, register int n)
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{
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register int r;
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if (!n)
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return (0);
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if (kvm_f == NULL)
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if (openkmem(NULL, NULL) == -1)
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return (-1);
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while ((r = kvm_read(kvm_f, pos, buf, n)) < n)
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if (r <= 0)
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{
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fprintf(stderr, "pos=0x%lx ", (u_long)pos);
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perror("kmemcpy:read");
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return (-1);
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}
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else
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{
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buf += r;
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pos += r;
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n -= r;
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}
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return (0);
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}
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int
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kstrncpy(register char *buf, long pos, register int n)
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{
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register int r;
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if (!n)
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return (0);
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if (kvm_f == NULL)
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if (openkmem(NULL, NULL) == -1)
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return (-1);
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while (n > 0)
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{
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r = kvm_read(kvm_f, pos, buf, 1);
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if (r <= 0)
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{
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fprintf(stderr, "pos=0x%lx ", (u_long)pos);
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perror("kmemcpy:read");
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return (-1);
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}
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else
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{
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if (*buf == '\0')
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break;
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buf++;
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pos++;
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n--;
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}
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}
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return (0);
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}
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