/*      $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));


        }

}