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/*
* (C)opyright 1993,1994,1995 by Darren Reed.
*
* Redistribution and use in source and binary forms are permitted
* provided that this notice is preserved and due credit is given
* to the original author and the contributors.
*/
/*
tcpdump -n
00:05:47.816843 128.231.76.76.3291 > 224.2.252.231.36573: udp 36 (encap)
tcpdump -nq
00:33:48.410771 192.73.213.11.1463 > 224.2.248.153.59360: udp 31 (encap)
tcpdump -nqt
128.250.133.13.23 > 128.250.20.20.2419: tcp 27
tcpdump -nqtt
123456789.1234567 128.250.133.13.23 > 128.250.20.20.2419: tcp 27
tcpdump -nqte
8:0:20:f:65:f7 0:0:c:1:8a:c5 81: 128.250.133.13.23 > 128.250.20.20.2419: tcp 27
*/
#include <stdio.h>
#include <string.h>
#if !defined(__SVR4) && !defined(__GNUC__)
#include <strings.h>
#endif
#include <sys/types.h>
#include <sys/param.h>
#include <stdlib.h>
#include <unistd.h>
#include <stddef.h>
#include <sys/socket.h>
#include <sys/ioctl.h>
#include <netinet/in.h>
#include <netinet/in_systm.h>
#include <netinet/ip_var.h>
#include <netinet/ip.h>
#include <netinet/tcp.h>
#include <netinet/udp.h>
#include <netinet/ip_icmp.h>
#include <netinet/tcpip.h>
#include <net/if.h>
#include <netdb.h>
#include "ip_fil.h"
#include "ipf.h"
#include "ipt.h"
#ifndef lint
static char sccsid[] = "@(#)ipft_td.c 1.7 1/12/96 (C)1995 Darren Reed";
#endif
static int tcpd_open(), tcpd_close(), tcpd_readip();
#ifdef NEED_INET_ATON
extern u_long inet_aton();
#else
#include <arpa/inet.h>
#endif
struct ipread tcpd = { tcpd_open, tcpd_close, tcpd_readip };
static FILE *tfp = NULL;
static int tfd = -1;
static int tcpd_open(fname)
char *fname;
{
if (tfd != -1)
return tfd;
if (!strcmp(fname, "-")) {
tfd = 0;
tfp = stdin;
} else {
tfd = open(fname, O_RDONLY);
tfp = fdopen(tfd, "r");
}
return tfd;
}
static int tcpd_close()
{
(void) fclose(tfp);
return close(tfd);
}
static int count_dots(str)
char *str;
{
int i = 0;
while (*str)
if (*str++ == '.')
i++;
return i;
}
static int tcpd_readip(buf, cnt, ifn, dir)
char *buf, **ifn;
int cnt, *dir;
{
struct tcpiphdr pkt;
struct ip *ip = (struct ip *)&pkt;
struct protoent *p;
char src[32], dst[32], misc[256], time[32], link1[32], link2[32];
char lbuf[160], *s;
int n, dots, slen, extra = 0;
if (!fgets(lbuf, sizeof(lbuf) - 1, tfp))
return 0;
if ((s = strchr(lbuf, '\n')))
*s = '\0';
lbuf[sizeof(lbuf)-1] = '\0';
bzero(&pkt, sizeof(pkt));
if ((n = sscanf(lbuf, "%s > %s: %s", src, dst, misc)) != 3)
if ((n = sscanf(lbuf, "%s %s > %s: %s",
time, src, dst, misc)) != 4)
if ((n = sscanf(lbuf, "%s %s: %s > %s: %s",
link1, link2, src, dst, misc)) != 5) {
n = sscanf(lbuf, "%s %s %s: %s > %s: %s",
time, link1, link2, src, dst, misc);
if (n != 6)
return -1;
}
if ((dots = count_dots(dst)) == 4) {
s = strrchr(src, '.');
*s++ = '\0';
#ifdef NEED_INET_ATON
ip->ip_src.s_addr = inet_aton(src);
#else
(void) inet_aton(src, &ip->ip_src);
#endif
pkt.ti_sport = htons(atoi(s));
*--s = '.';
s = strrchr(dst, '.');
*s++ = '\0';
#ifdef NEED_INET_ATON
ip->ip_dst.s_addr = inet_aton(dst);
#else
(void) inet_aton(src, &ip->ip_dst);
#endif
pkt.ti_dport = htons(atoi(s));
*--s = '.';
} else {
#ifdef NEED_INET_ATON
ip->ip_src.s_addr = inet_aton(src);
ip->ip_dst.s_addr = inet_aton(dst);
#else
(void) inet_aton(src, &ip->ip_src);
(void) inet_aton(src, &ip->ip_dst);
#endif
}
ip->ip_len = ip->ip_hl = sizeof(struct ip);
s = strtok(misc, " :");
if ((p = getprotobyname(s))) {
ip->ip_p = p->p_proto;
switch (p->p_proto) {
case IPPROTO_TCP :
case IPPROTO_UDP :
s = strtok(NULL, " :");
ip->ip_len += atoi(s);
if (p->p_proto == IPPROTO_TCP)
extra = sizeof(struct tcphdr);
else if (p->p_proto == IPPROTO_UDP)
extra = sizeof(struct udphdr);
break;
#ifdef IGMP
case IPPROTO_IGMP :
extra = sizeof(struct igmp);
break;
#endif
case IPPROTO_ICMP :
extra = sizeof(struct icmp);
break;
default :
break;
}
}
slen = ip->ip_hl + extra + ip->ip_len;
return slen;
}
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