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/* $FreeBSD: stable/10/contrib/ipfilter/lib/kmem.c 255332 2013-09-06 23:11:19Z cy $ */ |
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|
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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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|
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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) && !defined(_AIX51) |
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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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|
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#include "kmem.h" |
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|
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#ifndef __STDC__ |
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# define const |
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#endif |
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|
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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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|
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|
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|
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#if !defined(__sgi) && !defined(__hpux) && !defined(__osf__) && \ |
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!defined(linux) && !defined(_AIX51) |
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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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|
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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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|
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typedef int * kvm_t; |
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|
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static kvm_t kvm_f = NULL; |
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static char *kvm_errstr = NULL; |
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|
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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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|
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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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|
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kvm_errstr = errstr; |
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|
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if (core == NULL) |
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core = "/dev/kmem"; |
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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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if (!n) |
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return 0; |
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|
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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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|
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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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|
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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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|
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if (!n) |
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return 0; |
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|
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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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|
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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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} |
