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/*
* (C)opyright 1993-1996 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.
*/
#include <stdio.h>
#include <assert.h>
#include <string.h>
#if !defined(__SVR4) && !defined(__svr4__)
#include <strings.h>
#else
#include <sys/byteorder.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/udp.h>
#include <netinet/tcp.h>
#include <netinet/ip_icmp.h>
#include <netinet/tcpip.h>
#include <net/if.h>
#include "ip_fil.h"
#include <netdb.h>
#include <arpa/nameser.h>
#include <arpa/inet.h>
#include <resolv.h>
#include "ipf.h"
#include "ipt.h"
#include <ctype.h>
#ifndef lint
static char sccsid[] = "@(#)ipt.c 1.17 3/9/96 (C) 1993-1996 Darren Reed";
#endif
extern int fr_check();
extern char *optarg;
extern struct frentry *ipfilter[2][2];
extern struct ipread snoop, etherf, tcpd, pcap, iptext, iphex;
extern void debug(), verbose();
struct frentry *ft_in = NULL, *ft_out = NULL;
struct ipread *readers[] = { &iptext, ðerf, &tcpd, &snoop, &pcap, &iphex,
NULL };
int opts = 0;
int main(argc,argv)
int argc;
char *argv[];
{
struct ipread **r = readers;
struct frentry *f;
struct ip *ip;
u_long buf[64];
char c;
char *rules = NULL, *datain = NULL, *iface = NULL;
int fd, i, dir = 0;
while ((c = getopt(argc, argv, "bdEHi:I:Pr:STv")) != -1)
switch (c)
{
case 'b' :
opts |= OPT_BRIEF;
break;
case 'd' :
opts |= OPT_DEBUG;
break;
case 'i' :
datain = optarg;
break;
case 'I' :
iface = optarg;
break;
case 'r' :
rules = optarg;
break;
case 'v' :
opts |= OPT_VERBOSE;
break;
case 'E' :
for (i = 0, r = readers; *r; i++, r++)
if (*r == ðerf)
break;
break;
case 'H' :
for (i = 0, r = readers; *r; i++, r++)
if (*r == &iphex)
break;
break;
case 'P' :
for (i = 0, r = readers; *r; i++, r++)
if (*r == &pcap)
break;
break;
case 'S' :
for (i = 0, r = readers; *r; i++, r++)
if (*r == &snoop)
break;
break;
case 'T' :
for (i = 0, r = readers; *r; i++, r++)
if (*r == &tcpd)
break;
break;
}
if (!rules) {
(void)fprintf(stderr,"no rule file present\n");
exit(-1);
}
initparse ();
if (rules) {
struct frentry *fr;
char line[513], *s;
FILE *fp;
if (!strcmp(rules, "-"))
fp = stdin;
else if (!(fp = fopen(rules, "r"))) {
(void)fprintf(stderr, "couldn't open %s\n", rules);
exit(-1);
}
if (!(opts & OPT_BRIEF))
(void)printf("opening rule file \"%s\"\n", rules);
while (fgets(line, sizeof(line)-1, fp)) {
/*
* treat both CR and LF as EOL
*/
if ((s = index(line, '\n')))
*s = '\0';
if ((s = index(line, '\r')))
*s = '\0';
/*
* # is comment marker, everything after is a ignored
*/
if ((s = index(line, '#')))
*s = '\0';
if (!*line)
continue;
if (!(fr = parse(line)))
continue;
f = (struct frentry *)malloc(sizeof(*f));
if (fr->fr_flags & FR_INQUE) {
if (!ft_in)
ft_in = ipfilter[0][0] = f;
else
ft_in->fr_next = f, ft_in = f;
} else if (fr->fr_flags & FR_OUTQUE) {
if (!ft_out)
ft_out = ipfilter[1][0] = f;
else
ft_out->fr_next = f, ft_out = f;
}
bcopy((char *)fr, (char *)f, sizeof(*fr));
}
(void)fclose(fp);
}
if (datain)
fd = (*(*r)->r_open)(datain);
else
fd = (*(*r)->r_open)("-");
if (fd < 0)
exit(-1);
ip = (struct ip *)buf;
while ((i = (*(*r)->r_readip)(buf, sizeof(buf), &iface, &dir)) > 0) {
ip->ip_off = ntohs(ip->ip_off);
ip->ip_len = ntohs(ip->ip_len);
switch (fr_check(ip, ip->ip_hl << 2, iface, dir))
{
case -1 :
(void)printf("block");
break;
case 0 :
(void)printf("pass");
break;
case 1 :
(void)printf("nomatch");
break;
}
if (!(opts & OPT_BRIEF)) {
putchar(' ');
printpacket(buf);
printf("--------------");
}
putchar('\n');
dir = 0;
}
(*(*r)->r_close)();
return 0;
}
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