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
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
|
/* SPDX-License-Identifier: GPL-2.0-or-later */
/*
* rtmon.c RTnetlink listener.
*
* Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
*/
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <fcntl.h>
#include <sys/socket.h>
#include <sys/time.h>
#include <netinet/in.h>
#include <string.h>
#include "version.h"
#include "utils.h"
#include "libnetlink.h"
static int init_phase = 1;
static void write_stamp(FILE *fp)
{
char buf[128];
struct nlmsghdr *n1 = (void *)buf;
struct timeval tv;
n1->nlmsg_type = NLMSG_TSTAMP;
n1->nlmsg_flags = 0;
n1->nlmsg_seq = 0;
n1->nlmsg_pid = 0;
n1->nlmsg_len = NLMSG_LENGTH(4*2);
gettimeofday(&tv, NULL);
((__u32 *)NLMSG_DATA(n1))[0] = tv.tv_sec;
((__u32 *)NLMSG_DATA(n1))[1] = tv.tv_usec;
fwrite((void *)n1, 1, NLMSG_ALIGN(n1->nlmsg_len), fp);
}
static int dump_msg(struct rtnl_ctrl_data *ctrl,
struct nlmsghdr *n, void *arg)
{
FILE *fp = (FILE *)arg;
if (!init_phase)
write_stamp(fp);
fwrite((void *)n, 1, NLMSG_ALIGN(n->nlmsg_len), fp);
fflush(fp);
return 0;
}
static int dump_msg2(struct nlmsghdr *n, void *arg)
{
return dump_msg(NULL, n, arg);
}
static void usage(void)
{
fprintf(stderr,
"Usage: rtmon [ OPTIONS ] file FILE [ all | LISTofOBJECTS ]\n"
"OPTIONS := { -f[amily] { inet | inet6 | link | help } |\n"
" -4 | -6 | -0 | -V[ersion] }\n"
"LISTofOBJECTS := [ link ] [ address ] [ route ]\n");
exit(-1);
}
int
main(int argc, char **argv)
{
FILE *fp;
struct rtnl_handle rth;
int family = AF_UNSPEC;
unsigned int groups = ~0U;
int llink = 0;
int laddr = 0;
int lroute = 0;
char *file = NULL;
while (argc > 1) {
if (matches(argv[1], "-family") == 0) {
argc--;
argv++;
if (argc <= 1)
missarg("family type");
if (strcmp(argv[1], "inet") == 0)
family = AF_INET;
else if (strcmp(argv[1], "inet6") == 0)
family = AF_INET6;
else if (strcmp(argv[1], "link") == 0)
family = AF_INET6;
else if (strcmp(argv[1], "help") == 0)
usage();
else {
fprintf(stderr, "Protocol ID \"%s\" is unknown, try \"rtmon help\".\n", argv[1]);
exit(-1);
}
} else if (strcmp(argv[1], "-4") == 0) {
family = AF_INET;
} else if (strcmp(argv[1], "-6") == 0) {
family = AF_INET6;
} else if (strcmp(argv[1], "-0") == 0) {
family = AF_PACKET;
} else if (matches(argv[1], "-Version") == 0) {
printf("rtmon utility, iproute2-%s\n", version);
exit(0);
} else if (matches(argv[1], "file") == 0) {
argc--;
argv++;
if (argc <= 1)
missarg("file");
file = argv[1];
} else if (matches(argv[1], "link") == 0) {
llink = 1;
groups = 0;
} else if (matches(argv[1], "address") == 0) {
laddr = 1;
groups = 0;
} else if (matches(argv[1], "route") == 0) {
lroute = 1;
groups = 0;
} else if (strcmp(argv[1], "all") == 0) {
groups = ~0U;
} else if (matches(argv[1], "help") == 0) {
usage();
} else {
fprintf(stderr, "Argument \"%s\" is unknown, try \"rtmon help\".\n", argv[1]);
exit(-1);
}
argc--; argv++;
}
if (file == NULL) {
fprintf(stderr, "Not enough information: argument \"file\" is required\n");
exit(-1);
}
if (llink)
groups |= nl_mgrp(RTNLGRP_LINK);
if (laddr) {
if (!family || family == AF_INET)
groups |= nl_mgrp(RTNLGRP_IPV4_IFADDR);
if (!family || family == AF_INET6)
groups |= nl_mgrp(RTNLGRP_IPV6_IFADDR);
}
if (lroute) {
if (!family || family == AF_INET)
groups |= nl_mgrp(RTNLGRP_IPV4_ROUTE);
if (!family || family == AF_INET6)
groups |= nl_mgrp(RTNLGRP_IPV6_ROUTE);
}
fp = fopen(file, "w");
if (fp == NULL) {
perror("Cannot fopen");
exit(-1);
}
if (rtnl_open(&rth, groups) < 0)
exit(1);
if (rtnl_linkdump_req(&rth, AF_UNSPEC) < 0) {
perror("Cannot send dump request");
exit(1);
}
write_stamp(fp);
if (rtnl_dump_filter(&rth, dump_msg2, fp) < 0) {
fprintf(stderr, "Dump terminated\n");
return 1;
}
init_phase = 0;
if (rtnl_listen(&rth, dump_msg, (void *)fp) < 0)
exit(2);
exit(0);
}
|
