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Added check to prevent BACnet/IP messages from myself.

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This commit is contained in:
skarg
2005-07-03 11:15:08 +00:00
parent 36bebd5247
commit 0bf6b5885e
1 changed files with 23 additions and 15 deletions
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bacnet-stack/ports/linux/bip.c
+23 -15
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@@ -276,22 +276,30 @@ uint16_t bip_receive(
/* Original-Broadcast-NPDU or Original-Unicast-NPDU */
if ((buf[1] == 0x0B) || (buf[1] == 0x0A))
{
// copy the source address
src->mac_len = 6;
(void)encode_unsigned32(&src->mac[0],
sin.sin_addr.s_addr);
(void)encode_unsigned16(&src->mac[4],
sin.sin_port);
// FIXME: check destination address
// see if it is broadcast or for us
/* decode the length of the PDU - length is inclusive of BVLC */
(void)decode_unsigned16(&buf[2],&pdu_len);
/* copy the buffer into the PDU */
pdu_len -= 4; /* BVLC header */
if (pdu_len < max_pdu)
memmove(&pdu[0],&buf[4],pdu_len);
else
/* ignore messages from me */
if (sin.sin_addr.s_addr == BIP_Address.s_addr)
pdu_len = 0;
else
{
/* copy the source address
FIXME: IPv6? */
src->mac_len = 6;
(void)encode_unsigned32(&src->mac[0],
sin.sin_addr.s_addr);
(void)encode_unsigned16(&src->mac[4],
sin.sin_port);
// FIXME: check destination address
// see if it is broadcast or for us
/* decode the length of the PDU - length is inclusive of BVLC */
(void)decode_unsigned16(&buf[2],&pdu_len);
/* copy the buffer into the PDU */
pdu_len -= 4; /* BVLC header */
if (pdu_len < max_pdu)
memmove(&pdu[0],&buf[4],pdu_len);
else
pdu_len = 0;
}
}
return pdu_len;