diff options
Diffstat (limited to 'freebsd/netinet/libalias/alias_cuseeme.c')
| -rw-r--r-- | freebsd/netinet/libalias/alias_cuseeme.c | 230 |
1 files changed, 230 insertions, 0 deletions
diff --git a/freebsd/netinet/libalias/alias_cuseeme.c b/freebsd/netinet/libalias/alias_cuseeme.c new file mode 100644 index 00000000..f66318a8 --- /dev/null +++ b/freebsd/netinet/libalias/alias_cuseeme.c @@ -0,0 +1,230 @@ +#include <rtems/freebsd/machine/rtems-bsd-config.h> + +/*- + * Copyright (c) 1998 Brian Somers <brian@Awfulhak.org> + * with the aid of code written by + * Junichi SATOH <junichi@astec.co.jp> 1996, 1997. + * 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. + */ + +#include <rtems/freebsd/sys/cdefs.h> +__FBSDID("$FreeBSD$"); + +#ifdef _KERNEL +#include <rtems/freebsd/sys/param.h> +#include <rtems/freebsd/sys/kernel.h> +#include <rtems/freebsd/sys/module.h> +#else +#include <rtems/freebsd/errno.h> +#include <rtems/freebsd/sys/types.h> +#include <rtems/freebsd/stdio.h> +#endif + +#include <rtems/freebsd/netinet/in_systm.h> +#include <rtems/freebsd/netinet/in.h> +#include <rtems/freebsd/netinet/ip.h> +#include <rtems/freebsd/netinet/udp.h> + +#ifdef _KERNEL +#include <rtems/freebsd/netinet/libalias/alias.h> +#include <rtems/freebsd/netinet/libalias/alias_local.h> +#include <rtems/freebsd/netinet/libalias/alias_mod.h> +#else +#include <rtems/freebsd/local/alias_local.h> +#include <rtems/freebsd/local/alias_mod.h> +#endif + +#define CUSEEME_PORT_NUMBER 7648 + +static void +AliasHandleCUSeeMeOut(struct libalias *la, struct ip *pip, + struct alias_link *lnk); + +static void +AliasHandleCUSeeMeIn(struct libalias *la, struct ip *pip, + struct in_addr original_addr); + +static int +fingerprint(struct libalias *la, struct alias_data *ah) +{ + + if (ah->dport == NULL || ah->oaddr == NULL) + return (-1); + if (ntohs(*ah->dport) == CUSEEME_PORT_NUMBER) + return (0); + return (-1); +} + +static int +protohandlerin(struct libalias *la, struct ip *pip, struct alias_data *ah) +{ + + AliasHandleCUSeeMeIn(la, pip, *ah->oaddr); + return (0); +} + +static int +protohandlerout(struct libalias *la, struct ip *pip, struct alias_data *ah) +{ + + AliasHandleCUSeeMeOut(la, pip, ah->lnk); + return (0); +} + +/* Kernel module definition. */ +struct proto_handler handlers[] = { + { + .pri = 120, + .dir = OUT, + .proto = UDP, + .fingerprint = &fingerprint, + .protohandler = &protohandlerout + }, + { + .pri = 120, + .dir = IN, + .proto = UDP, + .fingerprint = &fingerprint, + .protohandler = &protohandlerin + }, + { EOH } +}; + +static int +mod_handler(module_t mod, int type, void *data) +{ + int error; + + switch (type) { + case MOD_LOAD: + error = 0; + LibAliasAttachHandlers(handlers); + break; + case MOD_UNLOAD: + error = 0; + LibAliasDetachHandlers(handlers); + break; + default: + error = EINVAL; + } + return (error); +} + +#ifdef _KERNEL +static +#endif +moduledata_t +alias_mod = { + "alias_cuseeme", mod_handler, NULL +}; + +#ifdef _KERNEL +DECLARE_MODULE(alias_cuseeme, alias_mod, SI_SUB_DRIVERS, SI_ORDER_SECOND); +MODULE_VERSION(alias_cuseeme, 1); +MODULE_DEPEND(alias_cuseeme, libalias, 1, 1, 1); +#endif + +/* CU-SeeMe Data Header */ +struct cu_header { + u_int16_t dest_family; + u_int16_t dest_port; + u_int32_t dest_addr; + int16_t family; + u_int16_t port; + u_int32_t addr; + u_int32_t seq; + u_int16_t msg; + u_int16_t data_type; + u_int16_t packet_len; +}; + +/* Open Continue Header */ +struct oc_header { + u_int16_t client_count; /* Number of client info structs */ + u_int32_t seq_no; + char user_name [20]; + char reserved [4]; /* flags, version stuff, etc */ +}; + +/* client info structures */ +struct client_info { + u_int32_t address;/* Client address */ + char reserved [8]; /* Flags, pruning bitfield, packet + * counts etc */ +}; + +static void +AliasHandleCUSeeMeOut(struct libalias *la, struct ip *pip, struct alias_link *lnk) +{ + struct udphdr *ud = ip_next(pip); + + if (ntohs(ud->uh_ulen) - sizeof(struct udphdr) >= sizeof(struct cu_header)) { + struct cu_header *cu; + struct alias_link *cu_lnk; + + cu = udp_next(ud); + if (cu->addr) + cu->addr = (u_int32_t) GetAliasAddress(lnk).s_addr; + + cu_lnk = FindUdpTcpOut(la, pip->ip_src, GetDestAddress(lnk), + ud->uh_dport, 0, IPPROTO_UDP, 1); + +#ifndef NO_FW_PUNCH + if (cu_lnk) + PunchFWHole(cu_lnk); +#endif + } +} + +static void +AliasHandleCUSeeMeIn(struct libalias *la, struct ip *pip, struct in_addr original_addr) +{ + struct in_addr alias_addr; + struct udphdr *ud; + struct cu_header *cu; + struct oc_header *oc; + struct client_info *ci; + char *end; + int i; + + (void)la; + alias_addr.s_addr = pip->ip_dst.s_addr; + ud = ip_next(pip); + cu = udp_next(ud); + oc = (struct oc_header *)(cu + 1); + ci = (struct client_info *)(oc + 1); + end = (char *)ud + ntohs(ud->uh_ulen); + + if ((char *)oc <= end) { + if (cu->dest_addr) + cu->dest_addr = (u_int32_t) original_addr.s_addr; + if (ntohs(cu->data_type) == 101) + /* Find and change our address */ + for (i = 0; (char *)(ci + 1) <= end && i < oc->client_count; i++, ci++) + if (ci->address == (u_int32_t) alias_addr.s_addr) { + ci->address = (u_int32_t) original_addr.s_addr; + break; + } + } +} |