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Add AX.25 packet tracking.

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This commit is contained in:
Jonathan Naylor
2020-06-18 12:51:13 +01:00
parent b3398710bc
commit d9e2940f08
9 changed files with 175 additions and 28 deletions
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154
AX25Control.cpp
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@@ -27,8 +27,9 @@ const unsigned char BIT_MASK_TABLE[] = { 0x80U, 0x40U, 0x20U, 0x10U, 0x08U, 0x04
#define WRITE_BIT1(p,i,b) p[(i)>>3] = (b) ? (p[(i)>>3] | BIT_MASK_TABLE[(i)&7]) : (p[(i)>>3] & ~BIT_MASK_TABLE[(i)&7])
#define READ_BIT1(p,i) (p[(i)>>3] & BIT_MASK_TABLE[(i)&7])
CAX25Control::CAX25Control(CAX25Network* network) :
CAX25Control::CAX25Control(CAX25Network* network, bool trace) :
m_network(network),
m_trace(trace),
m_enabled(true),
m_fp(NULL)
{
@@ -45,7 +46,15 @@ bool CAX25Control::writeModem(unsigned char *data, unsigned int len)
if (!m_enabled)
return false;
CUtils::dump(1U, "AX.25 raw packet", data, len);
if (m_trace)
decode(data, len);
CUtils::dump(1U, "AX.25 raw packet", data, len);
if (m_network != NULL) {
if (isUI(data, len))
m_network->writeAX25(data, len);
}
return true;
}
@@ -95,3 +104,144 @@ void CAX25Control::enable(bool enabled)
{
m_enabled = enabled;
}
void CAX25Control::decode(const unsigned char* data, unsigned int length)
{
assert(data != NULL);
assert(length >= 15U);
std::string text;
bool more = decodeAddress(data + 7U, text);
text += '>';
decodeAddress(data + 0U, text);
unsigned int n = 14U;
while (more && n < length) {
text += ',';
more = decodeAddress(data + n, text, true);
n += 7U;
}
text += ' ';
if ((data[n] & 0x01U) == 0x00U) {
// I frame
char t[20U];
::sprintf(t, "<I S%u R%u>", (data[n] >> 1) & 0x07U, (data[n] >> 5) & 0x07U);
text += t;
} else {
if ((data[n] & 0x02U) == 0x00U) {
// S frame
char t[20U];
switch (data[n] & 0x0FU) {
case 0x01U:
sprintf(t, "<RR R%u>", (data[n] >> 5) & 0x07U);
break;
case 0x05U:
sprintf(t, "<RNR R%u>", (data[n] >> 5) & 0x07U);
break;
case 0x09U:
sprintf(t, "<REJ R%u>", (data[n] >> 5) & 0x07U);
break;
case 0x0DU:
sprintf(t, "<SREJ R%u>", (data[n] >> 5) & 0x07U);
break;
default:
sprintf(t, "<Unknown R%u>", (data[n] >> 5) & 0x07U);
break;
}
text += t;
LogMessage("AX.25, %s", text.c_str());
return;
} else {
// U frame
switch (data[n] & 0xEFU) {
case 0x6FU:
text += "<SABME>";
break;
case 0x2FU:
text += "<SABM>";
break;
case 0x43U:
text += "<DISC>";
break;
case 0x0FU:
text += "<DM>";
break;
case 0x63U:
text += "<UA>";
break;
case 0x87U:
text += "<FRMR>";
break;
case 0x03U:
text += "<UI>";
break;
case 0xAFU:
text += "<XID>";
break;
case 0xE3U:
text += "<TEST>";
break;
default:
text += "<Unknown>";
break;
}
if ((data[n] & 0xEFU) != 0x03U) {
LogMessage("AX.25, %s", text.c_str());
return;
}
}
}
n += 2U;
LogMessage("AX.25, %s %.*s", text.c_str(), length - n, data + n);
}
bool CAX25Control::decodeAddress(const unsigned char* data, std::string& text, bool isDigi) const
{
assert(data != NULL);
for (unsigned int i = 0U; i < 6U; i++) {
char c = data[i] >> 1;
if (c != ' ')
text += c;
}
unsigned char ssid = (data[6U] >> 1) & 0x0FU;
if (ssid > 0U) {
text += '-';
if (ssid >= 10U) {
text += '1';
text += '0' + ssid - 10U;
}
else {
text += '0' + ssid;
}
}
if (isDigi) {
if ((data[6U] & 0x80U) == 0x80U)
text += '*';
}
return (data[6U] & 0x01U) == 0x00U;
}
bool CAX25Control::isUI(const unsigned char* data, unsigned int length) const
{
assert(data != NULL);
assert(length >= 15U);
unsigned int n = 13U;
while ((data[n] & 0x01U) == 0x00U && n < length)
n += 7U;
return (data[n + 1U] & 0xEFU) == 0x03U;
}