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Add false positive checks to Interlogix

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This commit is contained in:
Christian W. Zuckschwerdt
2018-09-10 10:34:28 +02:00
parent 5b5f012b67
commit e8a5e9915c
1 changed files with 16 additions and 0 deletions
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16
src/devices/interlogix.c
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@@ -131,10 +131,26 @@ static int interlogix_callback(bitbuffer_t *bitbuffer)
return 0;
}
if (bitbuffer->bits_per_row[row] - bit_offset > INTERLOGIX_MSG_BIT_LEN + 7) {
if (debug_output)
fprintf(stderr, "Found valid preamble but message size (%d) too long, exiting! \n", bitbuffer->bits_per_row[row] - bit_offset);
return 0;
}
uint8_t message[(INTERLOGIX_MSG_BIT_LEN + 7) / 8];
bitbuffer_extract_bytes(bitbuffer, row, bit_offset, message, INTERLOGIX_MSG_BIT_LEN);
// reduce false positives, abort if id or code looks wrong
if (message[0] == 0x00 && message[1] == 0x00 && message[2] == 0x00)
return 0;
if (message[0] == 0xff && message[1] == 0xff && message[2] == 0xff)
return 0;
if (message[3] == 0x00 && message[4] == 0x00 && message[5] == 0x00)
return 0;
if (message[3] == 0xff && message[4] == 0xff && message[5] == 0xff)
return 0;
// parity check: even data bits from message[0 .. 40] and odd data bits from message[1 .. 41]
// i.e. 5 bytes and two (top-most) bits.
int parity = message[0] ^ message[1] ^ message[2] ^ message[3] ^ message[4]; // parity as byte