1
2 /*
3 * Copyright (C) 2012 by Darren Reed.
4 *
5 * See the IPFILTER.LICENCE file for details on licencing.
6 */
7 /*
8 * kmemcpy() - copies n bytes from kernel memory into user buffer.
9 * returns 0 on success, -1 on error.
10 */
11
12 #include <stdio.h>
13 #include <sys/param.h>
14 #include <sys/types.h>
15 #include <sys/uio.h>
16 #include <unistd.h>
17 #include <string.h>
18 #include <fcntl.h>
19 #include <sys/file.h>
20 #include <kvm.h>
21 #include <fcntl.h>
22 #include <sys/socket.h>
23 #include <sys/ioctl.h>
24 #include <netinet/in.h>
25 #include <arpa/inet.h>
26 #include <netinet/in_systm.h>
27 #include <netinet/ip.h>
28 #include <net/if.h>
29
30 #include "kmem.h"
31
32 #if !defined(lint)
33 static const char sccsid[] = "@(#)kmem.c 1.4 1/12/96 (C) 1992 Darren Reed";
34 static const char rcsid[] = "@(#)$Id$";
35 #endif
36
37
38
39 static kvm_t *kvm_f = NULL;
40
41
42 int
openkmem(char * kern,char * core)43 openkmem(char *kern, char *core)
44 {
45 kvm_f = kvm_open(kern, core, NULL, O_RDONLY, NULL);
46 if (kvm_f == NULL)
47 {
48 perror("openkmem:open");
49 return (-1);
50 }
51 return (kvm_f != NULL);
52 }
53
54 int
kmemcpy(register char * buf,long pos,register int n)55 kmemcpy(register char *buf, long pos, register int n)
56 {
57 register int r;
58
59 if (!n)
60 return (0);
61
62 if (kvm_f == NULL)
63 if (openkmem(NULL, NULL) == -1)
64 return (-1);
65
66 while ((r = kvm_read(kvm_f, pos, buf, n)) < n)
67 if (r <= 0)
68 {
69 fprintf(stderr, "pos=0x%lx ", (u_long)pos);
70 perror("kmemcpy:read");
71 return (-1);
72 }
73 else
74 {
75 buf += r;
76 pos += r;
77 n -= r;
78 }
79 return (0);
80 }
81
82 int
kstrncpy(register char * buf,long pos,register int n)83 kstrncpy(register char *buf, long pos, register int n)
84 {
85 register int r;
86
87 if (!n)
88 return (0);
89
90 if (kvm_f == NULL)
91 if (openkmem(NULL, NULL) == -1)
92 return (-1);
93
94 while (n > 0)
95 {
96 r = kvm_read(kvm_f, pos, buf, 1);
97 if (r <= 0)
98 {
99 fprintf(stderr, "pos=0x%lx ", (u_long)pos);
100 perror("kmemcpy:read");
101 return (-1);
102 }
103 else
104 {
105 if (*buf == '\0')
106 break;
107 buf++;
108 pos++;
109 n--;
110 }
111 }
112 return (0);
113 }
114