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
|
/* $OpenBSD: print-cnfp.c,v 1.9 2015/11/15 20:35:36 mmcc Exp $ */
/*
* Copyright (c) 1998 Michael Shalayeff
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
/* Cisco NetFlow protocol */
#include <sys/types.h>
#include <sys/time.h>
#include <sys/socket.h>
#include <netdb.h>
#include <netinet/in.h>
#include <netinet/tcp.h>
#include <arpa/inet.h>
#include <stdio.h>
#include <string.h>
#include "interface.h"
#include "addrtoname.h"
struct nfhdr {
u_int32_t ver_cnt; /* version [15], and # of records */
u_int32_t msys_uptime;
u_int32_t utc_sec;
u_int32_t utc_nsec;
u_int32_t sequence; /* v5 flow sequence number */
u_int32_t reserved; /* v5 only */
};
struct nfrec {
struct in_addr src_ina;
struct in_addr dst_ina;
struct in_addr nhop_ina;
u_int32_t ifaces; /* src,dst ifaces */
u_int32_t packets;
u_int32_t octets;
u_int32_t start_time; /* sys_uptime value */
u_int32_t last_time; /* sys_uptime value */
u_int32_t ports; /* src,dst ports */
u_int32_t proto_tos; /* proto, tos, pad, flags(v5) */
u_int32_t asses; /* v1: flags; v5: src,dst AS */
u_int32_t masks; /* src,dst addr prefix */
};
void
cnfp_print(const u_char *cp, u_int len, const u_char *bp)
{
const struct nfhdr *nh;
const struct nfrec *nr;
const struct ip *ip;
int nrecs, ver, proto;
time_t t;
ip = (struct ip *)bp;
nh = (struct nfhdr *)cp;
if ((u_char *)(nh + 1) > snapend)
return;
nrecs = ntohl(nh->ver_cnt) & 0xffff;
ver = (ntohl(nh->ver_cnt) & 0xffff0000) >> 16;
t = ntohl(nh->utc_sec);
/* (p = ctime(&t))[24] = '\0'; */
printf("NetFlow v%x, %u.%03u uptime, %u.%09u, ", ver,
ntohl(nh->msys_uptime)/1000, ntohl(nh->msys_uptime)%1000,
ntohl(nh->utc_sec), ntohl(nh->utc_nsec));
if (ver == 5) {
printf("#%u, ", htonl(nh->sequence));
nr = (struct nfrec *)&nh[1];
} else
nr = (struct nfrec *)&nh->sequence;
printf("%2u recs", nrecs);
for (; nrecs-- && (u_char *)(nr + 1) <= snapend; nr++) {
char buf[5];
char asbuf[7];
printf("\n started %u.%03u, last %u.%03u",
ntohl(nr->start_time)/1000, ntohl(nr->start_time)%1000,
ntohl(nr->last_time)/1000, ntohl(nr->last_time)%1000);
asbuf[0] = buf[0] = '\0';
if (ver == 5) {
snprintf(buf, sizeof buf, "/%d",
(ntohl(nr->masks) >> 24) & 0xff);
snprintf(asbuf, sizeof asbuf, ":%d",
(ntohl(nr->asses) >> 16) & 0xffff);
}
printf("\n %s%s%s:%u ", inet_ntoa(nr->src_ina), buf, asbuf,
ntohl(nr->ports) >> 16);
if (ver == 5) {
snprintf(buf, sizeof buf, "/%d",
(ntohl(nr->masks) >> 16) & 0xff);
snprintf(asbuf, sizeof asbuf, ":%d",
ntohl(nr->asses) & 0xffff);
}
printf("> %s%s%s:%u ", inet_ntoa(nr->dst_ina), buf, asbuf,
ntohl(nr->ports) & 0xffff);
printf(">> %s\n ", inet_ntoa(nr->nhop_ina));
proto = (ntohl(nr->proto_tos) >> 8) & 0xff;
printf("%s ", ipproto_string(proto));
/* tcp flags for tcp only */
if (proto == IPPROTO_TCP) {
int flags;
if (ver == 1)
flags = (ntohl(nr->asses) >> 24) & 0xff;
else
flags = (ntohl(nr->proto_tos) >> 16) & 0xff;
if (flags & TH_FIN) putchar('F');
if (flags & TH_SYN) putchar('S');
if (flags & TH_RST) putchar('R');
if (flags & TH_PUSH) putchar('P');
if (flags & TH_ACK) putchar('A');
if (flags & TH_URG) putchar('U');
if (flags)
putchar(' ');
}
printf("tos %u, %u (%u octets)", ntohl(nr->proto_tos) & 0xff,
ntohl(nr->packets), ntohl(nr->octets));
}
}
|
