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DMR: Decode Additional IP Header Elements;

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Adjustments to Moto EXT Header and its LRRP Variant;

Make additional adjustments to LRRP PDUs based on above;
This commit is contained in:
lwvmobile
2025-02-28 07:39:14 -05:00
parent bc18db2bc2
commit 2ca15d8b53
4 changed files with 69 additions and 57 deletions
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83
src/dmr_pdu.c
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@@ -203,24 +203,38 @@ void dmr_udp_comp_pdu (dsd_opts * opts, dsd_state * state, uint16_t len, uint8_t
void dmr_ip_pdu (dsd_opts * opts, dsd_state * state, uint16_t len, uint8_t * DMR_PDU)
{
UNUSED(opts); UNUSED(state);
// uint8_t slot = state->currentslot;
UNUSED(state);
//the IPv4 Header
uint8_t version = DMR_PDU[0] >> 4; //may need to read ahead and get this value before coming here
uint8_t ihl = DMR_PDU[0] & 0xF; //decompressed value is 0x05 (may need to check this before preceeding)
uint8_t tos = DMR_PDU[1]; //0
uint16_t tlen = (DMR_PDU[2] << 8) | DMR_PDU[3]; //IPv4 header length (20 bytes) + UDP length (in bytes)
uint16_t iden = (DMR_PDU[4] << 8) | DMR_PDU[5];
uint8_t ipf = DMR_PDU[6] >> 5; //0
uint16_t offset = ((DMR_PDU[6] & 0x1F) << 8) | DMR_PDU[7]; //0
uint8_t ttl = DMR_PDU[8]; //should be 0x40 (64)
uint8_t prot = DMR_PDU[9];
uint16_t hsum = (DMR_PDU[10] << 8) | DMR_PDU[11];
//may need to look at sap value and determine the len of these addressing headers, etc
//and make a ptr to the start of actual PDU content data
// if (state->data_header_sap[slot] == 4)
// {
//adjust ptr, addressing type, etc
// }
if (opts->payload == 1)
fprintf (stderr, "\n IPv%d; Header Len: %d; Type of Service: %d; Total Len: %d; ID: %02X; Flags: %X;\n Fragment Offset: %d; TTL: %d; Protocol: %02X; Checksum: %04X; PDU Len: %d;", version, ihl, tos, tlen, iden, ipf, offset, ttl, prot, hsum, len);
//take a look at the src, dst, and port indicated (assuming both ports will match)
uint32_t add1 = (DMR_PDU[13] << 16) | (DMR_PDU[14] << 8) | DMR_PDU[15]; //The 0C or 0D indicator will usually tell if this is src or dst
uint32_t add2 = (DMR_PDU[17] << 16) | (DMR_PDU[18] << 8) | DMR_PDU[19];
uint32_t src24 = (DMR_PDU[13] << 16) | (DMR_PDU[14] << 8) | DMR_PDU[15]; //The 0C or 0D indicator will usually tell if this is src or dst
uint32_t dst24 = (DMR_PDU[17] << 16) | (DMR_PDU[18] << 8) | DMR_PDU[19];
uint16_t port1 = (DMR_PDU[20] << 8) | DMR_PDU[21];
uint16_t port2 = (DMR_PDU[22] << 8) | DMR_PDU[23];
fprintf (stderr, "\n %02X ADD1: %d; Port: %d; %02X ADD2: %d; Port: %d; Len: %d; ", DMR_PDU[12], add1, port1, DMR_PDU[16], add2, port2, len);
fprintf (stderr, "\n SRC(24): %08d; IP: %03d.%03d.%03d.%03d; Port: %04d; ", src24, DMR_PDU[12], DMR_PDU[13], DMR_PDU[14], DMR_PDU[15], port1);
fprintf (stderr, "\n DST(24): %08d; IP: %03d.%03d.%03d.%03d; Port: %04d; ", dst24, DMR_PDU[16], DMR_PDU[17], DMR_PDU[18], DMR_PDU[19], port2);
//Are DMR PDU types only dictated by Port Number? Or is this just the defaults when programmed?
//if this is correct, the starting point and Report value on LRRP is wrong, but might explain the UNK value in there after 0x1F, etc
uint16_t udp_len = (DMR_PDU[24] << 8) | DMR_PDU[25]; //This UDP Length information element is the length in bytes of this user datagram including this header and the application data
uint16_t udp_chk = (DMR_PDU[26] << 8) | DMR_PDU[27];
if (opts->payload == 1)
fprintf (stderr, "\n UDP Header Len: %d(%02X); UDP Checksum: %04X; ", udp_len, udp_len, udp_chk);
//Are IP DMR PDU types only dictated by Port Number? Or is this just the defaults when programmed?
if (port1 == 231 && port2 == 231)
{
fprintf (stderr, "Cellocator;");
@@ -228,7 +242,7 @@ void dmr_ip_pdu (dsd_opts * opts, dsd_state * state, uint16_t len, uint8_t * DMR
else if (port1 == 4001 && port2 == 4001)
{
fprintf (stderr, "LRRP;");
dmr_lrrp (opts, state, len-24-4, add1, add2, port1, port2, DMR_PDU+24);
dmr_lrrp (opts, state, len-28-4-1, src24, dst24, port1, port2, DMR_PDU+28); //len is offset with IP and UDP header lens, 4 CRC, and 1 for the 0D token
}
else if (port1 == 4004 && port2 == 4004)
{
@@ -279,6 +293,7 @@ void dmr_ip_pdu (dsd_opts * opts, dsd_state * state, uint16_t len, uint8_t * DMR
void dmr_lrrp (dsd_opts * opts, dsd_state * state, uint16_t len, uint32_t source, uint32_t dest, uint16_t port_s, uint16_t port_d, uint8_t * DMR_PDU)
{
UNUSED(port_s); UNUSED(port_d); //moved to header decode
uint16_t message_len = 0;
uint8_t slot = state->currentslot;
uint8_t lrrp_confidence = 0; //variable to increment based on number of tokens found, the more, the higher the confidence level
@@ -319,24 +334,18 @@ void dmr_lrrp (dsd_opts * opts, dsd_state * state, uint16_t len, uint32_t source
char deg_glyph[4];
sprintf (deg_glyph, "%s", "°");
//triggered information report
uint8_t report = DMR_PDU[1];
uint16_t unk = (DMR_PDU[2] << 8) | DMR_PDU[3]; //not sure what the following after the report value indicates exactly
//TODO: Needs more fixing, finding some things like report 0x12 with only partial updates on it
//debug passed LRRP message
fprintf (stderr, "\n LRRP (Debug): ");
for (uint16_t i = 0; i < len; i++)
fprintf (stderr, "%02X ", DMR_PDU[i]);
//start looking for tokens
for (uint16_t i = 4; i < len; i++) //starting at 4 offsets the octets before 0D (seen 0D tossed into the other values folliowing report value)
for (uint16_t i = 0; i < len; i++)
{
switch(DMR_PDU[i]){
case 0x0D: //message len indicator
if (i == 4 && message_len == 0) //see if this is the first octet, otherwise, can't verify this is going to work //i == 4 &&
if (i == 0 && message_len == 0) //see if this is the first octet, otherwise, can't verify this is going to work
{
message_len = DMR_PDU[i+1];
i += 1;
@@ -434,26 +443,18 @@ void dmr_lrrp (dsd_opts * opts, dsd_state * state, uint16_t len, uint32_t source
break;
}
}
if (report && message_len > 0)
if (message_len > 0)
{
fprintf (stderr, "%s", KYEL);
fprintf (stderr, "\n LRRP Report: %02X; Unk: %04X; Message Len: %d;", report, unk, message_len);
if (lrrp_confidence >= 3) //find the sweet magical number
if (lrrp_confidence >= 3) //minimal of src, dst, and message len indicator
{
if (source)
{
fprintf (stderr, "\n");
fprintf (stderr, " Source: %08d - %04d", source, port_s);
fprintf (stderr, "\n");
fprintf (stderr, " Destination: %08d - %04d", dest, port_d);
}
if (year)
{
fprintf (stderr, "\n");
fprintf (stderr, " LRRP - Time: ");
fprintf (stderr, " Time:");
fprintf (stderr, " %04d.%02d.%02d %02d:%02d:%02d", year, month, day, hour, minute, second);
}
@@ -480,8 +481,8 @@ void dmr_lrrp (dsd_opts * opts, dsd_state * state, uint16_t len, uint32_t source
lat_fin = (double)lat * lat_unit * lat_sign;
lon_fin = (double)lon * lon_unit * lon_sign;
fprintf (stderr, " LRRP - Lat: %.5lf", lat_fin);
fprintf (stderr, " Lon: %.5lf", lon_fin);
fprintf (stderr, " Lat: %.5lf", lat_fin);
fprintf (stderr, " Lon: %.5lf", lon_fin);
fprintf (stderr, " (%.5lf, %.5lf)", lat_fin , lon_fin);
}
@@ -489,23 +490,23 @@ void dmr_lrrp (dsd_opts * opts, dsd_state * state, uint16_t len, uint32_t source
if (rad)
{
fprintf (stderr, "\n");
fprintf (stderr, " LRRP - Radius: %dm", rad); //unsure of 'units' or calculation for radius (meters?)
fprintf (stderr, " Radius: %dm", rad); //unsure of 'units' or calculation for radius (meters?)
}
if (alt)
{
fprintf (stderr, "\n");
fprintf (stderr, " LRRP - Altitude: %dm", alt); //unsure of 'units' or calculation for alt (meters?)
fprintf (stderr, " Altitude: %dm", alt); //unsure of 'units' or calculation for alt (meters?)
}
if (vel_set)
{
fprintf (stderr, "\n");
fprintf (stderr, " LRRP - Speed: %.4lf m/s %.4lf km/h %.4lf mph", velocity, (3.6 * velocity), (2.2369 * velocity));
fprintf (stderr, " Speed: %.4lf m/s %.4lf km/h %.4lf mph", velocity, (3.6 * velocity), (2.2369 * velocity));
}
if (deg_set)
{
fprintf (stderr, "\n");
fprintf (stderr, " LRRP - Track: %d%s", degrees, deg_glyph);
fprintf (stderr, " Track: %d%s", degrees, deg_glyph);
}
//write to LRRP file, if a lat/lon is present
@@ -556,7 +557,7 @@ void dmr_lrrp (dsd_opts * opts, dsd_state * state, uint16_t len, uint32_t source
sprintf (lrrpstr, "%s", "");
sprintf (velstr, "%s", "");
sprintf (degstr, "%s", "");
if (lat) sprintf (lrrpstr, "LRRP %0d (%lf, %lf)", source, lat_fin, lon_fin);
if (lat) sprintf (lrrpstr, "LRRP SRC: %0d; (%lf, %lf)", source, lat_fin, lon_fin);
if (vel_set) sprintf (velstr, " %.4lf km/h", velocity * 3.6);
if (deg_set) sprintf (degstr, " %d%s ", degrees, deg_glyph);
sprintf (state->dmr_lrrp_gps[slot], "%s%s%s", lrrpstr, velstr, degstr);