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Correct the length for bad data crc in mstpcap (#393)

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Co-authored-by: Steve Karg <skarg@users.sourceforge.net>
This commit is contained in:
Steve Karg
2023-02-03 11:04:53 -06:00
committed by GitHub
parent 7f7b419411
commit 85976ee1f8
1 changed files with 9 additions and 2 deletions
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apps/mstpcap/main.c
+9 -2
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@@ -591,6 +591,7 @@ static void write_received_packet(
uint32_t ts_usec = 0; /* timestamp microseconds */
uint32_t incl_len = 0; /* number of octets of packet saved in file */
uint32_t orig_len = 0; /* actual length of packet */
uint32_t data_crc_len = 2;
uint8_t header[MSTP_HEADER_MAX] = { 0 }; /* MS/TP header */
struct timeval tv;
size_t max_data = 0;
@@ -608,7 +609,13 @@ static void write_received_packet(
if (mstp_port->ReceivedInvalidFrame) {
if (mstp_port->Index) {
max_data = min(mstp_port->InputBufferSize, mstp_port->Index);
incl_len = orig_len = header_len + max_data + 2 /* checksum*/;
if ((mstp_port->DataLength > 0) &&
(mstp_port->Index == (mstp_port->DataLength + 1))) {
/* case where index is not incremented for CRC2,
so only 1 for checksum */
data_crc_len = 1;
}
incl_len = orig_len = header_len + max_data + data_crc_len;
} else {
/* header only */
incl_len = orig_len = header_len;
@@ -617,7 +624,7 @@ static void write_received_packet(
if (mstp_port->DataLength) {
max_data =
min(mstp_port->InputBufferSize, mstp_port->DataLength);
incl_len = orig_len = header_len + max_data + 2 /* checksum*/;
incl_len = orig_len = header_len + max_data + data_crc_len;
} else {
/* header only - or at least some bytes of the header */
incl_len = orig_len = header_len;