204 lines
3.6 KiB
C
204 lines
3.6 KiB
C
/* $NetBSD: kmem.c,v 1.2 2004/03/28 14:15:38 he Exp $ */
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/*
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* Copyright (C) 1993-2001 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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#if !defined(__sgi) && !defined(__hpux) && !defined(__osf__) && !defined(linux)
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#include <kvm.h>
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#endif
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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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#if __FreeBSD_version >= 300000
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# include <net/if_var.h>
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#endif
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#if defined(linux) || defined(__osf__) || defined(__sgi) || defined(__hpux)
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# include <stdlib.h>
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#endif
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#include "kmem.h"
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#ifndef __STDC__
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# define const
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#endif
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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: kmem.c,v 1.16 2004/01/08 13:34:32 darrenr Exp";
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#endif
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#if !defined(__sgi) && !defined(__hpux) && !defined(__osf__) && !defined(linux)
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/*
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* For all platforms where there is a libkvm and a kvm_t, we use that...
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*/
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static kvm_t *kvm_f = NULL;
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#else
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/*
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*...and for the others (HP-UX, IRIX, Tru64), we have to provide our own.
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*/
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typedef int * kvm_t;
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static kvm_t kvm_f = NULL;
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static char *kvm_errstr = NULL;
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kvm_t kvm_open __P((char *, char *, char *, int, char *));
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int kvm_read __P((kvm_t, u_long, char *, size_t));
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kvm_t kvm_open(kernel, core, swap, mode, errstr)
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char *kernel, *core, *swap;
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int mode;
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char *errstr;
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{
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kvm_t k;
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int fd;
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kvm_errstr = errstr;
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if (core == NULL)
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core = "/dev/kmem";
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fd = open(core, mode);
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if (fd == -1)
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return NULL;
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k = malloc(sizeof(*k));
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if (k == NULL)
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return NULL;
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*k = fd;
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return k;
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}
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int kvm_read(kvm, pos, buffer, size)
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kvm_t kvm;
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u_long pos;
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char *buffer;
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size_t size;
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{
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int r = 0, left;
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char *bufp;
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if (lseek(*kvm, pos, 0) == -1) {
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if (kvm_errstr != NULL) {
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fprintf(stderr, "%s", kvm_errstr);
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perror("lseek");
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}
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return -1;
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}
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for (bufp = buffer, left = size; left > 0; bufp += r, left -= r) {
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r = read(*kvm, bufp, left);
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#ifdef __osf__
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/*
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* Tru64 returns "0" for successful operation, not the number
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* of bytes read.
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*/
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if (r == 0)
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r = left;
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#endif
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if (r <= 0)
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return -1;
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}
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return r;
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}
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#endif /* !defined(__sgi) && !defined(__hpux) && !defined(__osf__) */
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int openkmem(kern, core)
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char *kern, *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 kmemcpy(buf, pos, n)
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register char *buf;
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long pos;
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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 kstrncpy(buf, pos, n)
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register char *buf;
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long pos;
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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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