+/*
+ * Copyright (c) 2000-2002 Apple Computer, Inc. All rights reserved.
+ *
+ * @APPLE_LICENSE_HEADER_START@
+ *
+ * The contents of this file constitute Original Code as defined in and
+ * are subject to the Apple Public Source License Version 1.1 (the
+ * "License"). You may not use this file except in compliance with the
+ * License. Please obtain a copy of the License at
+ * http://www.apple.com/publicsource and read it before using this file.
+ *
+ * This Original Code and all software distributed under the License are
+ * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
+ * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
+ * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT. Please see the
+ * License for the specific language governing rights and limitations
+ * under the License.
+ *
+ * @APPLE_LICENSE_HEADER_END@
+ */
+/*-
+ * Copyright (c) 2001 Charles Mott <cmott@scientech.com>
+ * 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.
+ *
+ * Based upon:
+ * $FreeBSD: src/lib/libalias/alias_irc.c,v 1.5.2.4 2001/08/21 16:42:42 ru Exp $
+ */
+
/* Alias_irc.c intercepts packages contain IRC CTCP commands, and
changes DCC commands to export a port on the aliasing host instead
of an aliased host.
The handling of this is copied more-or-less verbatim from
ftp_alias.c
- This software is placed into the public domain with no restrictions
- on its distribution.
-
Initial version: Eivind Eklund <perhaps@yes.no> (ee) 97-01-29
Version 2.1: May, 1997 (cjm)
char newpacket[65536]; /* Estimate of maximum packet size :) */
int copyat = i; /* Same */
int iCopy = 0; /* How much data have we written to copy-back string? */
- unsigned long org_addr; /* Original IP address */
+ in_addr_t org_addr; /* Original IP address */
unsigned short org_port; /* Original source port address */
lCTCP_START:
if( i >= dlen || iCopy >= sizeof(newpacket) )
/* Fetch IP address */
org_addr = 0;
while(i<dlen && isdigit(sptr[i])) {
- if( org_addr > ULONG_MAX/10UL ) { /* Terminate on overflow */
+ if( org_addr > 0xFFFFFFFF/10UL ) { /* Terminate on overflow */
DBprintf(("DCC Address overflow (org_addr == 0x%08lx, next char %c\n", org_addr, sptr[i]));
goto lBAD_CTCP;
}
true_addr.s_addr = htonl(org_addr);
destaddr.s_addr = 0;
+ /* Sanity/Security checking */
+ if (!org_addr || !org_port ||
+ pip->ip_src.s_addr != true_addr.s_addr ||
+ org_port < IPPORT_RESERVED)
+ goto lBAD_CTCP;
+
/* Steal the FTP_DATA_PORT - it doesn't really matter, and this
would probably allow it through at least _some_
firewalls. */
- dcc_link = FindUdpTcpOut (true_addr,
- destaddr,
- true_port,
- 0, IPPROTO_TCP);
+ dcc_link = FindUdpTcpOut(true_addr, destaddr,
+ true_port, 0,
+ IPPROTO_TCP, 1);
DBprintf(("Got a DCC link\n"));
if ( dcc_link ) {
struct in_addr alias_address; /* Address from aliasing */
alias_address = GetAliasAddress(link);
iCopy += snprintf(&newpacket[iCopy],
sizeof(newpacket)-iCopy,
- "%lu ", (u_long)htonl(alias_address.s_addr));
+ "%u ", (in_addr_t)htonl(alias_address.s_addr));
if( iCopy >= sizeof(newpacket) ) { /* Truncated/fit exactly - bad news */
DBprintf(("DCC constructed packet overflow.\n"));
goto lBAD_CTCP;
projects / apple / network_cmds.git / blobdiff