diff options
Diffstat (limited to 'sys/contrib/ipfilter/netinet/ip_netbios_pxy.c')
| -rw-r--r-- | sys/contrib/ipfilter/netinet/ip_netbios_pxy.c | 118 |
1 files changed, 118 insertions, 0 deletions
diff --git a/sys/contrib/ipfilter/netinet/ip_netbios_pxy.c b/sys/contrib/ipfilter/netinet/ip_netbios_pxy.c new file mode 100644 index 0000000..1a0b2a2 --- /dev/null +++ b/sys/contrib/ipfilter/netinet/ip_netbios_pxy.c @@ -0,0 +1,118 @@ +/* + * Simple netbios-dgm transparent proxy for in-kernel use. + * For use with the NAT code. + * $Id: ip_netbios_pxy.c,v 2.8.2.1 2005/08/20 13:48:23 darrenr Exp $ + */ + +/*- + * Copyright (c) 2002-2003 Paul J. Ledbetter III + * 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 AND CONTRIBUTORS ``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 OR CONTRIBUTORS 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. + * + * $Id: ip_netbios_pxy.c,v 2.8.2.1 2005/08/20 13:48:23 darrenr Exp $ + */ + +#define IPF_NETBIOS_PROXY + +int ippr_netbios_init __P((void)); +void ippr_netbios_fini __P((void)); +int ippr_netbios_out __P((fr_info_t *, ap_session_t *, nat_t *)); + +static frentry_t netbiosfr; + +int netbios_proxy_init = 0; + +/* + * Initialize local structures. + */ +int ippr_netbios_init() +{ + bzero((char *)&netbiosfr, sizeof(netbiosfr)); + netbiosfr.fr_ref = 1; + netbiosfr.fr_flags = FR_INQUE|FR_PASS|FR_QUICK|FR_KEEPSTATE; + MUTEX_INIT(&netbiosfr.fr_lock, "NETBIOS proxy rule lock"); + netbios_proxy_init = 1; + + return 0; +} + + +void ippr_netbios_fini() +{ + if (netbios_proxy_init == 1) { + MUTEX_DESTROY(&netbiosfr.fr_lock); + netbios_proxy_init = 0; + } +} + + +int ippr_netbios_out(fin, aps, nat) +fr_info_t *fin; +ap_session_t *aps; +nat_t *nat; +{ + char dgmbuf[6]; + int off, dlen; + udphdr_t *udp; + ip_t *ip; + mb_t *m; + + aps = aps; /* LINT */ + nat = nat; /* LINT */ + + m = fin->fin_m; + dlen = fin->fin_dlen - sizeof(*udp); + /* + * no net bios datagram could possibly be shorter than this + */ + if (dlen < 11) + return 0; + + ip = fin->fin_ip; + udp = (udphdr_t *)fin->fin_dp; + off = (char *)udp - (char *)ip + sizeof(*udp) + fin->fin_ipoff; + + /* + * move past the + * ip header; + * udp header; + * 4 bytes into the net bios dgm header. + * According to rfc1002, this should be the exact location of + * the source address/port + */ + off += 4; + + /* Copy NATed source Address/port*/ + dgmbuf[0] = (char)((ip->ip_src.s_addr ) &0xFF); + dgmbuf[1] = (char)((ip->ip_src.s_addr >> 8) &0xFF); + dgmbuf[2] = (char)((ip->ip_src.s_addr >> 16)&0xFF); + dgmbuf[3] = (char)((ip->ip_src.s_addr >> 24)&0xFF); + + dgmbuf[4] = (char)((udp->uh_sport )&0xFF); + dgmbuf[5] = (char)((udp->uh_sport >> 8)&0xFF); + + /* replace data in packet */ + COPYBACK(m, off, sizeof(dgmbuf), dgmbuf); + + return 0; +} |
