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/* $OpenBSD: print-cnfp.c,v 1.11 2022/01/05 05:41:25 dlg 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 struct nfhdr *nh;
const struct nfrec *nr;
int nrecs, ver, proto;
nh = (struct nfhdr *)cp;
if ((u_char *)(nh + 1) > snapend)
return;
nrecs = ntohl(nh->ver_cnt) & 0xffff;
ver = (ntohl(nh->ver_cnt) & 0xffff0000) >> 16;
/* (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));
}
}
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