1 /* $OpenBSD: print-cnfp.c,v 1.11 2022/01/05 05:41:25 dlg Exp $ */
2
3 /*
4 * Copyright (c) 1998 Michael Shalayeff
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
17 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
18 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
19 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
21 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
22 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
23 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
24 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
25 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
26 */
27
28 /* Cisco NetFlow protocol */
29
30 #include <sys/types.h>
31 #include <sys/time.h>
32 #include <sys/socket.h>
33 #include <netdb.h>
34
35 #include <netinet/in.h>
36 #include <netinet/tcp.h>
37 #include <arpa/inet.h>
38
39 #include <stdio.h>
40 #include <string.h>
41
42 #include "interface.h"
43 #include "addrtoname.h"
44
45 struct nfhdr {
46 u_int32_t ver_cnt; /* version [15], and # of records */
47 u_int32_t msys_uptime;
48 u_int32_t utc_sec;
49 u_int32_t utc_nsec;
50 u_int32_t sequence; /* v5 flow sequence number */
51 u_int32_t reserved; /* v5 only */
52 };
53
54 struct nfrec {
55 struct in_addr src_ina;
56 struct in_addr dst_ina;
57 struct in_addr nhop_ina;
58 u_int32_t ifaces; /* src,dst ifaces */
59 u_int32_t packets;
60 u_int32_t octets;
61 u_int32_t start_time; /* sys_uptime value */
62 u_int32_t last_time; /* sys_uptime value */
63 u_int32_t ports; /* src,dst ports */
64 u_int32_t proto_tos; /* proto, tos, pad, flags(v5) */
65 u_int32_t asses; /* v1: flags; v5: src,dst AS */
66 u_int32_t masks; /* src,dst addr prefix */
67
68 };
69
70 void
cnfp_print(const u_char * cp,u_int len)71 cnfp_print(const u_char *cp, u_int len)
72 {
73 const struct nfhdr *nh;
74 const struct nfrec *nr;
75 int nrecs, ver, proto;
76
77 nh = (struct nfhdr *)cp;
78
79 if ((u_char *)(nh + 1) > snapend)
80 return;
81
82 nrecs = ntohl(nh->ver_cnt) & 0xffff;
83 ver = (ntohl(nh->ver_cnt) & 0xffff0000) >> 16;
84 /* (p = ctime(&t))[24] = '\0'; */
85
86 printf("NetFlow v%x, %u.%03u uptime, %u.%09u, ", ver,
87 ntohl(nh->msys_uptime)/1000, ntohl(nh->msys_uptime)%1000,
88 ntohl(nh->utc_sec), ntohl(nh->utc_nsec));
89
90 if (ver == 5) {
91 printf("#%u, ", htonl(nh->sequence));
92 nr = (struct nfrec *)&nh[1];
93 } else
94 nr = (struct nfrec *)&nh->sequence;
95
96 printf("%2u recs", nrecs);
97
98 for (; nrecs-- && (u_char *)(nr + 1) <= snapend; nr++) {
99 char buf[5];
100 char asbuf[7];
101
102 printf("\n started %u.%03u, last %u.%03u",
103 ntohl(nr->start_time)/1000, ntohl(nr->start_time)%1000,
104 ntohl(nr->last_time)/1000, ntohl(nr->last_time)%1000);
105
106 asbuf[0] = buf[0] = '\0';
107 if (ver == 5) {
108 snprintf(buf, sizeof buf, "/%d",
109 (ntohl(nr->masks) >> 24) & 0xff);
110 snprintf(asbuf, sizeof asbuf, ":%d",
111 (ntohl(nr->asses) >> 16) & 0xffff);
112 }
113 printf("\n %s%s%s:%u ", inet_ntoa(nr->src_ina), buf, asbuf,
114 ntohl(nr->ports) >> 16);
115
116 if (ver == 5) {
117 snprintf(buf, sizeof buf, "/%d",
118 (ntohl(nr->masks) >> 16) & 0xff);
119 snprintf(asbuf, sizeof asbuf, ":%d",
120 ntohl(nr->asses) & 0xffff);
121 }
122 printf("> %s%s%s:%u ", inet_ntoa(nr->dst_ina), buf, asbuf,
123 ntohl(nr->ports) & 0xffff);
124
125 printf(">> %s\n ", inet_ntoa(nr->nhop_ina));
126
127 proto = (ntohl(nr->proto_tos) >> 8) & 0xff;
128 printf("%s ", ipproto_string(proto));
129
130 /* tcp flags for tcp only */
131 if (proto == IPPROTO_TCP) {
132 int flags;
133 if (ver == 1)
134 flags = (ntohl(nr->asses) >> 24) & 0xff;
135 else
136 flags = (ntohl(nr->proto_tos) >> 16) & 0xff;
137 if (flags & TH_FIN) putchar('F');
138 if (flags & TH_SYN) putchar('S');
139 if (flags & TH_RST) putchar('R');
140 if (flags & TH_PUSH) putchar('P');
141 if (flags & TH_ACK) putchar('A');
142 if (flags & TH_URG) putchar('U');
143 if (flags)
144 putchar(' ');
145 }
146 printf("tos %u, %u (%u octets)", ntohl(nr->proto_tos) & 0xff,
147 ntohl(nr->packets), ntohl(nr->octets));
148
149
150 }
151
152 }
153
154