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
|
/*
* Copyright (C) 2014-2017 Firejail Authors
*
* This file is part of firejail project
*
* 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, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include "firemon.h"
#define MAXBUF 4096
static void print_arp(const char *fname) {
FILE *fp = fopen(fname, "r");
if (!fp)
return;
printf(" ARP Table:\n");
char buf[MAXBUF];
while (fgets(buf, MAXBUF, fp)) {
// remove blanks, \n
char *ptr = buf;
while (*ptr == ' ' || *ptr == '\t')
ptr++;
char *start = ptr;
if (*start == '\0')
continue;
ptr = strchr(ptr, '\n');
if (ptr)
*ptr = '\0';
// remove table header
//IP address HW type Flags HW address Mask Device
if (strncmp(start, "IP address", 10) == 0)
continue;
// extract data
char ip[64];
char type[64];
char flags[64];
char mac[64];
char mask[64];
char device[64];
int rv = sscanf(start, "%s %s %s %s %s %s\n", ip, type, flags, mac, mask, device);
if (rv != 6)
continue;
// destination ip
unsigned a, b, c, d;
if (sscanf(ip, "%u.%u.%u.%u", &a, &b, &c, &d) != 4 || a > 255 || b > 255 || c > 255 || d > 255)
continue;
uint32_t destip = a * 0x1000000 + b * 0x10000 + c * 0x100 + d;
if (strcmp(flags, "0x0") == 0)
printf(" %d.%d.%d.%d dev %s FAILED\n",
PRINT_IP(destip), device);
else
printf(" %d.%d.%d.%d dev %s lladdr %s REACHABLE\n",
PRINT_IP(destip), device, mac);
}
fclose(fp);
}
void arp(pid_t pid, int print_procs) {
pid_read(pid);
// print processes
int i;
for (i = 0; i < max_pids; i++) {
if (pids[i].level == 1) {
if (print_procs || pid == 0)
pid_print_list(i, arg_nowrap);
int child = find_child(i);
if (child != -1) {
char *fname;
if (asprintf(&fname, "/proc/%d/net/arp", child) == -1)
errExit("asprintf");
print_arp(fname);
free(fname);
}
}
}
printf("\n");
}
|
