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/* $OpenBSD: ipt.c,v 1.18 2001/01/17 06:01:22 fgsch Exp $ */
/*
* Copyright (C) 1993-2000 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.
*/
#ifdef __FreeBSD__
# include <osreldate.h>
#endif
#include <stdio.h>
#include <assert.h>
#include <string.h>
#include <sys/types.h>
#if !defined(__SVR4) && !defined(__svr4__) && !defined(__sgi)
#include <strings.h>
#else
#if !defined(__sgi)
#include <sys/byteorder.h>
#endif
#include <sys/file.h>
#endif
#include <sys/param.h>
#include <sys/time.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>
#ifndef linux
#include <netinet/ip_var.h>
#endif
#include <netinet/ip.h>
#include <netinet/udp.h>
#include <netinet/tcp.h>
#include <netinet/ip_icmp.h>
#include <net/if.h>
#if __FreeBSD_version >= 300000
# include <net/if_var.h>
#endif
#include <netdb.h>
#include <arpa/nameser.h>
#include <arpa/inet.h>
#include <resolv.h>
#include <ctype.h>
#include <netinet/ip_compat.h>
#include <netinet/tcpip.h>
#include <netinet/ip_fil.h>
#include <netinet/ip_nat.h>
#include <netinet/ip_state.h>
#include "ipf.h"
#include "ipt.h"
#if !defined(lint)
static const char sccsid[] = "@(#)ipt.c 1.19 6/3/96 (C) 1993-2000 Darren Reed";
static const char rcsid[] = "@(#)$IPFilter: ipt.c,v 2.6 2000/03/13 22:10:25 darrenr Exp $";
#endif
extern char *optarg;
extern struct frentry *ipfilter[2][2];
extern struct ipread snoop, etherf, tcpd, pcap, iptext, iphex;
extern struct ifnet *get_unit __P((char *, int));
extern void init_ifp __P((void));
extern ipnat_t *natparse __P((char *, int));
extern int fr_running;
int opts = 0;
#ifdef USE_INET6
int use_inet6 = 0;
#endif
int main __P((int, char *[]));
int main(argc,argv)
int argc;
char *argv[];
{
struct ipread *r = &iptext;
u_long buf[2048];
struct ifnet *ifp;
char *rules = NULL, *datain = NULL, *iface = NULL;
ip_t *ip;
int fd, i, dir = 0, c;
while ((c = getopt(argc, argv, "6bdEHi:I:NoPr:STvX")) != -1)
switch (c)
{
#ifdef USE_INET6
case '6' :
use_inet6 = 1;
break;
#endif
case 'b' :
opts |= OPT_BRIEF;
break;
case 'd' :
opts |= OPT_DEBUG;
break;
case 'i' :
datain = optarg;
break;
case 'I' :
iface = optarg;
break;
case 'o' :
opts |= OPT_SAVEOUT;
break;
case 'r' :
rules = optarg;
break;
case 'v' :
opts |= OPT_VERBOSE;
break;
case 'E' :
r = ðerf;
break;
case 'H' :
r = &iphex;
break;
case 'N' :
opts |= OPT_NAT;
break;
case 'P' :
r = &pcap;
break;
case 'S' :
r = &snoop;
break;
case 'T' :
r = &tcpd;
break;
case 'X' :
r = &iptext;
break;
}
if (!rules) {
(void)fprintf(stderr,"no rule file present\n");
exit(-1);
}
nat_init();
fr_stateinit();
initparse();
fr_running = 1;
if (rules) {
char line[513], *s;
void *fr;
FILE *fp;
int linenum = 0;
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)) {
linenum++;
/*
* 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;
/* fake an `ioctl' call :) */
if ((opts & OPT_NAT) != 0) {
if (!(fr = natparse(line, linenum)))
continue;
i = IPL_EXTERN(ioctl)(IPL_LOGNAT, SIOCADNAT,
(caddr_t)&fr,
FWRITE|FREAD);
if (opts & OPT_DEBUG)
fprintf(stderr,
"iplioctl(ADNAT,%p,1) = %d\n",
fr, i);
} else {
if (!(fr = parse(line, linenum)))
continue;
i = IPL_EXTERN(ioctl)(0, SIOCADAFR,
(caddr_t)&fr,
FWRITE|FREAD);
if (opts & OPT_DEBUG)
fprintf(stderr,
"iplioctl(ADAFR,%p,1) = %d\n",
fr, i);
}
}
(void)fclose(fp);
}
if (opts & OPT_SAVEOUT)
init_ifp();
if (datain)
fd = (*r->r_open)(datain);
else
fd = (*r->r_open)("-");
if (fd < 0)
exit(-1);
ip = (ip_t *)buf;
while ((i = (*r->r_readip)((char *)buf, sizeof(buf),
&iface, &dir)) > 0) {
ifp = iface ? get_unit(iface, ip->ip_v) : NULL;
ip->ip_off = ntohs(ip->ip_off);
ip->ip_len = ntohs(ip->ip_len);
i = fr_check(ip, ip->ip_hl << 2, ifp, dir, (mb_t **)&buf);
if ((opts & OPT_NAT) == 0)
switch (i)
{
case -2 :
(void)printf("auth");
break;
case -1 :
(void)printf("block");
break;
case 0 :
(void)printf("pass");
break;
case 1 :
(void)printf("nomatch");
break;
}
if (!(opts & OPT_BRIEF)) {
putchar(' ');
printpacket((ip_t *)buf);
printf("--------------");
} else if ((opts & (OPT_BRIEF|OPT_NAT)) == (OPT_NAT|OPT_BRIEF))
printpacket((ip_t *)buf);
#ifndef linux
if (dir && ifp && ip->ip_v)
# ifdef __sgi
(*ifp->if_output)(ifp, (void *)buf, NULL);
# else
(*ifp->if_output)(ifp, (void *)buf, NULL, 0);
# endif
#endif
if ((opts & (OPT_BRIEF|OPT_NAT)) != (OPT_NAT|OPT_BRIEF))
putchar('\n');
dir = 0;
}
(*r->r_close)();
return 0;
}
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