1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
|
/*
* VUOS: view OS project
* Copyright (C) 2017 Renzo Davoli <renzo@cs.unibo.it>, Antonio Cardace <anto.cardace@gmail.com>
* VirtualSquare team.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
*/
#include <stdio.h>
#include <stdlib.h>
#include <fcntl.h>
#include <unistd.h>
#include <dirent.h>
#include <sys/syscall.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/socket.h>
#include <sys/epoll.h>
#include <vumodule.h>
#include <errno.h>
VU_PROTOTYPES(netlinkdump)
struct vu_module_t vu_module = {
.name = "netlinkdump",
.description = "dump netlink messages"
};
static struct vuht_entry_t *ht;
static void dump(const char *title, const uint8_t *data, size_t bufsize, ssize_t len) {
ssize_t line, i;
/* out format:
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
01234567890123456789012345678901234567890123456789012345678901234
*/
char hexbuf[48];
char charbuf[17];
printk("%s size %zd len %zd:\n", title, bufsize, len);
if (bufsize > 0 && len > 0) {
for (line = 0; line < len; line += 16) {
for (i = 0; i < 16; i++) {
ssize_t pos = line + i;
if (pos < len) {
sprintf(hexbuf + (3 * i), "%02x ", data[pos]);
charbuf[i] = data[pos] >= ' ' && data[pos] <= '~' ? data[pos] : '.';
} else {
sprintf(hexbuf + (3 * i), " ");
charbuf[i] = ' ';
}
}
charbuf[i] = 0;
printk(" %s %s\n", hexbuf, charbuf);
}
}
}
ssize_t vu_netlinkdump_sendto (int sockfd, const void *buf, size_t len, int flags,
const struct sockaddr *dest_addr, socklen_t addrlen,
void *msg_control, size_t msg_controllen, void *fdprivate) {
ssize_t retval = sendto(sockfd, buf, len, flags, dest_addr, addrlen);
dump("->", buf, len, retval);
return retval;
}
ssize_t vu_netlinkdump_recvfrom (int sockfd, void *buf, size_t len, int flags,
struct sockaddr *src_addr, socklen_t *addrlen,
void *msg_control, size_t *msg_controllen, void *fdprivate) {
ssize_t retval = recvfrom(sockfd, buf, len,flags, src_addr, addrlen);
dump("<-", buf, len, retval);
return retval;
}
void *vu_netlinkdump_init(void) {
struct vu_service_t *s = vu_mod_getservice();
int family = AF_NETLINK;
#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Wincompatible-pointer-types"
vu_syscall_handler(s, socket) = socket;
vu_syscall_handler(s, bind) = bind;
vu_syscall_handler(s, connect) = connect;
vu_syscall_handler(s, listen) = listen;
vu_syscall_handler(s, accept4) = accept4;
vu_syscall_handler(s, getsockname) = getsockname;
vu_syscall_handler(s, getpeername) = getpeername;
vu_syscall_handler(s, setsockopt) = setsockopt;
vu_syscall_handler(s, getsockopt) = getsockopt;
vu_syscall_handler(s, epoll_ctl) = epoll_ctl;
vu_syscall_handler(s, close) = close;
#pragma GCC diagnostic pop
ht = vuht_add(CHECKSOCKET, &family, sizeof(int), s, 0, NULL, NULL);
return NULL;
}
int vu_netlinkdump_fini(void *private) {
vuht_del(ht, MNT_FORCE);
return 0;
}
|
