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dprsgw.c
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dprsgw.c
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/* **************************************************************** *
* *
* APRX -- 2nd generation APRS iGate and digi with *
* minimal requirement of esoteric facilities or *
* libraries of any kind beyond UNIX system libc. *
* *
* (c) Matti Aarnio - OH2MQK, 2007-2014 *
* *
* **************************************************************** */
#include "aprx.h"
#ifndef DISABLE_IGATE
/*
* The DPRS RX Gateway
*
* Receive data from DPRS.
* Convert to 3rd-party frame.
* Send out to APRSIS and Digipeaters.
*
* http://www.aprs-is.net/DPRS.aspx
*
*
*
* GPSxyz -> APRS symbols mapping:
*
* http://www.aprs.org/symbols/symbolsX.txt
*/
typedef struct dprsgw_history {
time_t gated;
char callsign[10];
} dprsgw_history_t;
// Up to 30 history entries to not to send same callsign too often
#define HISTORYSIZE 30
typedef struct dprs_gw {
char *ggaline;
char *rmcline;
int ggaspace;
int rmcspace;
int historylimit; // Time limit in seconds
dprsgw_history_t history[HISTORYSIZE];
} dprsgw_t;
// The dprslog() logs ONLY when '-d' mode is running.
// .. and it will be removed soon.
const char *dprslogfile;
void dprslog( const time_t stamp, const uint8_t *buf ) {
if (dprslogfile == NULL) return; // Nothing to do
FILE *fp = fopen(dprslogfile,"a");
if (fp != NULL) {
fprintf(fp, "%ld\t%s\n", stamp, (const char *)buf);
fclose(fp);
}
}
static void dprsgw_flush(dprsgw_t *dp) {
if (dp->ggaline == NULL) {
dp->ggaspace = 200;
dp->ggaline = malloc(200);
}
if (dp->rmcline == NULL) {
dp->rmcspace = 200;
dp->rmcline = malloc(200);
}
dp->ggaline[0] = 0;
dp->rmcline[0] = 0;
}
static void *dprsgw_new(int historylimit) {
dprsgw_t *dp = calloc(1, sizeof(*dp));
dp->historylimit = historylimit;
dprsgw_flush(dp); // init buffers
return dp;
}
// Ratelimit returns 0 for "can send", 1 for "too soon"
static int dprsgw_ratelimit( dprsgw_t *dp, const void *tnc2buf ) {
int i, n;
char callsign[10];
time_t expiry = tick.tv_sec - dp->historylimit;
memcpy(callsign, tnc2buf, sizeof(callsign));
callsign[sizeof(callsign)-1] = 0;
for (i = 0; i < sizeof(callsign); ++i) {
char c = callsign[i];
if (c == '>') {
callsign[i] = 0;
break;
}
}
n = -1;
for (i = 0; i < HISTORYSIZE; ++i) {
// Is there an entry?
if (dp->history[i].callsign[0] == 0)
continue;
if ((dp->history[i].gated - tick.tv_sec) > 0) {
// system time has jumped backwards, expire it.
dp->history[i].gated = expiry;
}
if ((dp->history[i].gated - expiry) > 0) {
// Fresh enough to be interesting!
if (strcmp(dp->history[i].callsign, callsign) == 0) {
// This callsign!
return 1;
}
} else {
dp->history[i].callsign[0] = 0; // discard it..
if (n < 0)
n = i; // save first free slot's index
}
}
if (n >= 0) {
memcpy(dp->history[n].callsign, callsign, sizeof(callsign));
dp->history[n].gated = tick.tv_sec;
}
return 0;
}
typedef struct gps2apr_syms {
const char gps[3];
const char aprs[3];
int flags;
} gps2aprs_syms_t;
// FIXME: Some symbols have 3 characters,
// others take 3rd as overlay...
// Add control flags below!
static const gps2aprs_syms_t gps2aprsSyms[] = {
{ "A0", "\\0", 0 },
{ "A1", "\\1", 0 },
{ "A2", "\\2", 0 },
{ "A3", "\\3", 0 },
{ "A4", "\\4", 0 },
{ "A5", "\\5", 0 },
{ "A6", "\\6", 0 },
{ "A7", "\\7", 0 },
{ "A8", "\\8", 0 },
{ "A9", "\\9", 0 },
{ "AA", "\\A", 0 },
{ "AB", "\\B", 0 },
{ "AC", "\\C", 0 },
{ "AD", "\\D", 0 },
{ "AE", "\\E", 0 },
{ "AF", "\\F", 0 },
{ "AG", "\\G", 0 },
{ "AH", "\\H", 0 },
{ "AI", "\\I", 0 },
{ "AJ", "\\J", 0 },
{ "AK", "\\K", 0 },
{ "AL", "\\L", 0 },
{ "AM", "\\M", 0 },
{ "AN", "\\N", 0 },
{ "AO", "\\O", 0 },
{ "AP", "\\P", 0 },
{ "AQ", "\\Q", 0 },
{ "AR", "\\R", 0 },
{ "AS", "\\S", 0 },
{ "AT", "\\T", 0 },
{ "AU", "\\U", 0 },
{ "AV", "\\V", 0 },
{ "AW", "\\W", 0 },
{ "AX", "\\X", 0 },
{ "AY", "\\Y", 0 },
{ "AZ", "\\Z", 0 },
{ "BB", "/!", 0 },
{ "BC", "/\"", 0 },
{ "BD", "/#", 0 },
{ "BE", "/$", 0 },
{ "BF", "/%", 0 },
{ "BG", "/&", 0 },
{ "BH", "/'", 0 },
{ "BI", "/(", 0 },
{ "BJ", "/)", 0 },
{ "BK", "/*", 0 },
{ "BL", "/+", 0 },
{ "BM", "/,", 0 },
{ "BN", "/-", 0 },
{ "BO", "/.", 0 },
{ "BP", "//", 0 },
{ "DS", "\\[", 0 },
{ "DT", "\\\\", 0 },
{ "DU", "\\]", 0 },
{ "DV", "\\^", 0 },
{ "DW", "\\_", 0 },
{ "DX", "\\`", 0 },
{ "HS", "/[", 0 },
{ "HT", "/\\", 0 },
{ "HU", "/]", 0 },
{ "HV", "/^", 0 },
{ "HW", "/_", 0 },
{ "HX", "/`", 0 },
{ "J1", "/{", 0 },
{ "J2", "/|", 0 },
{ "J3", "/}", 0 },
{ "J4", "/~", 0 },
{ "LA", "/a", 0 },
{ "LB", "/b", 0 },
{ "LC", "/c", 0 },
{ "LD", "/d", 0 },
{ "LE", "/e", 0 },
{ "LF", "/f", 0 },
{ "LG", "/g", 0 },
{ "LH", "/h", 0 },
{ "LI", "/i", 0 },
{ "LJ", "/j", 0 },
{ "LK", "/k", 0 },
{ "LL", "/l", 0 },
{ "LM", "/m", 0 },
{ "LN", "/n", 0 },
{ "LO", "/o", 0 },
{ "LP", "/p", 0 },
{ "LQ", "/q", 0 },
{ "LR", "/r", 0 },
{ "LS", "/s", 0 },
{ "LT", "/t", 0 },
{ "LU", "/u", 0 },
{ "LV", "/v", 0 },
{ "LW", "/w", 0 },
{ "LX", "/x", 0 },
{ "LY", "/y", 0 },
{ "LZ", "/z", 0 },
{ "MR", "/:", 0 },
{ "MS", "/;", 0 },
{ "MT", "/<", 0 },
{ "MU", "/=", 0 },
{ "MV", "/>", 0 },
{ "MW", "/?", 0 },
{ "MX", "/@", 0 },
{ "NR", "\\:", 0 },
{ "NS", "\\;", 0 },
{ "NT", "\\<", 0 },
{ "NU", "\\=", 0 },
{ "NV", "\\>", 0 },
{ "NW", "\\?", 0 },
{ "NX", "\\@", 0 },
{ "OB", "\\!", 0 },
{ "OC", "\\\"", 0 },
{ "OD", "\\#", 0 },
{ "OE", "\\$", 0 },
{ "OF", "\\%", 0 },
{ "OG", "\\&", 0 },
{ "OH", "\\'", 0 },
{ "OI", "\\(", 0 },
{ "OJ", "\\)", 0 },
{ "OK", "\\*", 0 },
{ "OL", "\\+", 0 },
{ "OM", "\\,", 0 },
{ "ON", "\\-", 0 },
{ "OO", "\\.", 0 },
{ "OP", "\\/", 0 },
{ "P0", "/0", 0 },
{ "P1", "/1", 0 },
{ "P2", "/2", 0 },
{ "P3", "/3", 0 },
{ "P4", "/4", 0 },
{ "P5", "/5", 0 },
{ "P6", "/6", 0 },
{ "P7", "/7", 0 },
{ "P8", "/8", 0 },
{ "P9", "/9", 0 },
{ "PA", "/A", 0 },
{ "PB", "/B", 0 },
{ "PC", "/C", 0 },
{ "PD", "/D", 0 },
{ "PE", "/E", 0 },
{ "PF", "/F", 0 },
{ "PG", "/G", 0 },
{ "PH", "/H", 0 },
{ "PI", "/I", 0 },
{ "PJ", "/J", 0 },
{ "PK", "/K", 0 },
{ "PL", "/L", 0 },
{ "PM", "/M", 0 },
{ "PN", "/N", 0 },
{ "PO", "/O", 0 },
{ "PP", "/P", 0 },
{ "PQ", "/Q", 0 },
{ "PR", "/R", 0 },
{ "PS", "/S", 0 },
{ "PT", "/T", 0 },
{ "PU", "/U", 0 },
{ "PV", "/V", 0 },
{ "PW", "/W", 0 },
{ "PX", "/X", 0 },
{ "PY", "/Y", 0 },
{ "PZ", "/Z", 0 },
{ "Q1", "\\{", 0 },
{ "Q2", "\\|", 0 },
{ "Q3", "\\}", 0 },
{ "Q4", "\\~", 0 },
{ "SA", "\\a", 0 },
{ "SB", "\\b", 0 },
{ "SC", "\\c", 0 },
{ "SD", "\\d", 0 },
{ "SE", "\\e", 0 },
{ "SF", "\\f", 0 },
{ "SG", "\\g", 0 },
{ "SH", "\\h", 0 },
{ "SI", "\\i", 0 },
{ "SJ", "\\j", 0 },
{ "SK", "\\k", 0 },
{ "SL", "\\l", 0 },
{ "SM", "\\m", 0 },
{ "SN", "\\n", 0 },
{ "SO", "\\o", 0 },
{ "SP", "\\p", 0 },
{ "SQ", "\\q", 0 },
{ "SR", "\\r", 0 },
{ "SS", "\\s", 0 },
{ "ST", "\\t", 0 },
{ "SU", "\\u", 0 },
{ "SV", "\\v", 0 },
{ "SW", "\\w", 0 },
{ "SX", "\\x", 0 },
{ "SY", "\\y", 0 },
{ "SZ", "\\z", 0 },
};
static int gps2aprs_syms_count = sizeof(gps2aprsSyms) / sizeof(gps2aprsSyms[0]);
static int parse_gps2aprs_symbol(const char *gpsxxx, char *aprssymbol) {
int i, mid, high, low;
char gps[3];
gps[0] = gpsxxx[0];
gps[1] = gpsxxx[1];
gps[2] = 0;
low = 0;
high = gps2aprs_syms_count-1;
while (low < high) {
mid = (low + high) >> 1; // divide by 2
i = strcmp(gps, gps2aprsSyms[mid].gps);
// if (debug) printf("GPS2APRS: '%s' '%s', low=%d mid=%d high=%d\n",gps, gps2aprsSyms[mid].gps, low, mid, high);
if (i == 0) {
// Exact match
char c3 = gpsxxx[2];
strcpy(aprssymbol, gps2aprsSyms[mid].aprs);
if (c3 != 0 && c3 != ' ' && aprssymbol[0] != '/') {
// FIXME: overlay ???
aprssymbol[0] = c3;
}
return 0;
}
if (i > 0) {
low = mid+1;
} else {
high = mid-1;
}
}
return i;
}
// The "Specification" says to use this checksum method..
// It uses right-left inverted version of the polynome
// of CCITT-CRC-16 but in the end it INVERTS the result!
// Thus the result is NOT CCITT-CRC-16, but something
// uniquely ICOM D-STAR..
/*
static int dprsgw_crccheck( const uint8_t *s, int len )
{
int icomcrc = 0xffff;
for ( ; len > 0; ++s, --len) {
uint8_t ch = *s;
int i;
for (i = 0; i < 8; i++) {
int xorflag = (icomcrc ^ ch) & 0x01;
icomcrc >>= 1;
if (xorflag)
icomcrc ^= 0x8408;
ch >>= 1;
}
}
return (~icomcrc) & 0xffff;
}
*/
static int dprsgw_isvalid( struct serialport *S )
{
int i;
if (S->rdlinelen < 20) {
if (debug) printf("Too short a line for DPRS");
return 0; // definitely not!
}
if (memcmp("$$CRC", S->rdline, 5) == 0 && S->rdline[9] == ',') {
// Maybe a $$CRCB727,OH3BK-D>APRATS,DSTAR*:@165340h6128.23N/02353.52E-D-RATS (GPS-A) /A=000377
int crc;
int csum = -1;
int crc16;
S->rdline[S->rdlinelen] = '\r';
crc16 = calc_crc_ccitt(0xFFFF, S->rdline+10, S->rdlinelen+1-10); // INCLUDE the CR on CRC calculation!
crc = (crc16 ^ 0xFFFF); // Output is INVERTED
S->rdline[S->rdlinelen] = 0;
i = sscanf((const char*)(S->rdline), "$$CRC%04x,", &csum);
if (i != 1 || csum != crc) {
if (debug) printf("Bad DPRS APRS CRC: l=%d, i=%d, %04x/%04x vs. %s\n", S->rdlinelen, i, crc, csum, S->rdline);
// return 0;
} else {
if (debug>1) printf("$$CRC DSTAR=%04x CCITT-X25-FCS=%04x\n", csum, crc16);
if (debug) printf("Good DPRS APRS CRC: l=%d, i=%d, %04x/%04x vs. %s\n", S->rdlinelen, i, crc, csum, S->rdline);
return 1;
}
return 0;
} else if (memcmp("$GP", S->rdline, 3) == 0) {
// Maybe $GPRMC,170130.02,A,6131.6583,N,02339.1552,E,0.00,154.8,290510,6.5,E,A*02 ?
int xor = 0;
int csum = -1;
char c;
// if (debug) printf("NMEA: '%s'\n", S->rdline);
for (i = 1; i < S->rdlinelen; ++i) {
c = S->rdline[i];
if (c == '*' && (i >= S->rdlinelen - 3)) {
break;
}
xor ^= c;
}
xor &= 0xFF;
if (i != S->rdlinelen -3 || S->rdline[i] != '*')
return 0; // Wrong place to stop
if (sscanf((const char *)(S->rdline+i), "*%02x%c", &csum, &c) != 1) {
return 0; // Too little or too much
}
if (xor != csum) {
if (debug) printf("Bad DPRS $GP... checksum: %02x vs. %02x\n", csum, xor);
return 0;
}
return 1;
} else {
int xor = 0;
int csum = -1;
char c;
// .. uh? maybe? Precisely 29 characters:
// "OH3KGR M, "
if (S->rdlinelen != 29 || S->rdline[8] != ',') {
if (debug) printf("Bad DPRS identification(?) packet - length(%d) != 29 || line[8] != ',': %s\n",
S->rdlinelen, S->rdline);
return 0;
}
if (debug) printf("DPRS NMEA: '%s'\n", S->rdline);
for (i = 0; i < S->rdlinelen; ++i) {
c = S->rdline[i];
if (c == '*') {
break;
}
xor ^= c;
}
xor &= 0xFF;
if (sscanf((const char *)(S->rdline+i), "*%x%c", &csum, &c) < 1) {
if (memcmp(S->rdline+8, ", ", 21) == 0) {
if (debug) printf("DPRS IDENT LINE OK: '%s'\n", S->rdline);
return 1;
}
// if (debug) printf("csum bad NMEA: '%s'\n", S->rdline);
return 0; // Too little or too much
}
if (xor != csum) {
if (debug) printf("Bad DPRS IDENT LINE checksum: %02x vs. %02x\n", csum, xor);
return 0;
}
if (debug) printf("DPRS IDENT LINE OK: '%s'\n", S->rdline);
// if (debug) printf("csum valid NMEA: '%s'\n", S->rdline);
return 1; // Maybe valid?
}
}
// Split NMEA text line at ',' characters
static int dprsgw_nmea_split(char *nmea, char *fields[], int n) {
int i = 0;
--n;
fields[i] = nmea;
for ( ; *nmea; ++nmea ) {
for ( ; *nmea != 0 && *nmea != ','; ++nmea )
;
if (*nmea == 0) break; // THE END!
if (*nmea == ',')
*nmea++ = 0; // COMMA terminates a field, change to SPACE
if (i < n) ++i; // Prep next field index
fields[i] = nmea; // save field pointer
}
fields[i] = NULL;
return i;
}
static void dprsgw_nmea_igate( const struct aprx_interface *aif,
const uint8_t *ident, dprsgw_t *dp ) {
int i;
char *gga[20];
char *rmc[20];
char tnc2buf[2000];
int tnc2addrlen;
int tnc2buflen;
char *p, *p2;
const char *p0;
const char *s;
int alt_feet = -9999999;
char aprssym[3];
if (debug) {
printf(" DPRS: ident='%s', GGA='%s', RMC='%s'\n", ident, dp->ggaline, dp->rmcline);
}
strcpy(aprssym, "/>"); // Default..
parse_gps2aprs_symbol((const char *)ident+9, aprssym);
memset(gga, 0, sizeof(gga));
memset(rmc, 0, sizeof(rmc));
// $GPGGA,hhmmss.dd,xxmm.dddd,<N|S>,yyymm.dddd,<E|W>,v,
// ss,d.d,h.h,M,g.g,M,a.a,xxxx*hh<CR><LF>
// $GPRMC,hhmmss.dd,S,xxmm.dddd,<N|S>,yyymm.dddd,<E|W>,
// s.s,h.h,ddmmyy,d.d, <E|W>,M*hh<CR><LF>
// ,S, = Status: 'A' = Valid, 'V' = Invalid
if (dp->ggaline[0] != 0)
dprsgw_nmea_split(dp->ggaline, gga, 20);
if (dp->rmcline[0] != 0)
dprsgw_nmea_split(dp->rmcline, rmc, 20);
if (rmc[2] != NULL && strcmp(rmc[2],"A") != 0) {
if (debug) printf("Invalid DPRS $GPRMC packet (validity='%s')\n",
rmc[2]);
return;
}
if (gga[6] != NULL && strcmp(gga[6],"1") != 0) {
if (debug) printf("Invalid DPRS $GPGGA packet (validity='%s')\n",
gga[6]);
return;
}
if (dp->ggaline[0] == 0 && dp->rmcline[0] == 0) {
if (debug) printf("No DPRS $GPRMC nor $GPGGA packets available.\n");
return;
}
p = tnc2buf;
for (i = 0; i < 8; ++i) {
if (ident[i] == ' ') {
*p++ = '-';
for ( ; ident[i+1] == ' ' && i < 8; ++i );
continue;
}
*p++ = ident[i];
}
if (p > tnc2buf && p[-1] == '-') --p;
p += sprintf(p, ">APDPRS,DSTAR*");
tnc2addrlen = p - tnc2buf;
*p++ = ':';
*p++ = '!'; // Std position w/o messaging
p2 = p;
if (gga[2] != NULL) {
s = gga[2];
} else if (rmc[3] != NULL) {
s = rmc[3];
} else {
// No coordinate!
if (debug) printf("dprsgw: neither GGA nor RMC coordinates available, discarding!\n");
return;
}
p0 = strchr(s, '.');
if (!p0) {
if (debug) printf("dprsgw: invalid format NMEA North coordinate: '%s'\n", s);
return;
}
while (p0 - s < 4) {
*p++ = '0';
++p0; // move virtually
}
p += sprintf(p, "%s", s);
if (p2+7 < p) { // Too long!
p = p2+7;
}
while (p2+7 > p) { // Too short!
*p++ = ' '; // unprecise position
}
if (gga[2] != NULL) {
s = gga[3]; // <N|S>
} else if (rmc[3] != NULL) {
s = rmc[4]; // <N|S>
}
p += sprintf(p, "%s", s);
*p++ = aprssym[0];
p2 = p;
if (gga[2] != NULL) {
s = gga[4]; // yyymm.dddd
} else if (rmc[3] != NULL) {
s = rmc[5]; // yyymm.dddd
}
p0 = strchr(s, '.');
if (!p0) {
if (debug) printf("dprsgw: invalid format NMEA East coordinate: '%s'\n", s);
return;
}
while (p0 - s < 5) {
*p++ = '0';
++p0; // move virtually
}
p += sprintf(p, "%s", s);
if (p2+8 < p) { // Too long!
p = p2+8;
}
while (p2+8 > p) { // Too short!
*p++ = ' '; // unprecise position
}
if (gga[2] != NULL) {
p += sprintf(p, "%s", gga[5]); // <E|W>
} else if (rmc[3] != NULL) {
p += sprintf(p, "%s", rmc[6]); // <E|W>
}
*p++ = aprssym[1];
// DPRS: ident='OH3BK D,BN *59 ', GGA='$GPGGA,204805,6128.230,N,2353.520,E,1,3,0,115,M,0,M,,*6d', RMC=''
// DPRSGW GPS data: OH3BK-D>APDPRS,DSTAR*:!6128.23N/02353.52E>
if (gga[2] != NULL) {
if (gga[9] != NULL && gga[9][0] != 0)
alt_feet = strtol(gga[9], NULL, 10);
if (strcmp(gga[10],"M") == 0) {
// Meters! Convert to feet..
alt_feet = (10000 * alt_feet) / 3048;
} else {
// Already feet - presumably
}
}
// FIXME: more data!
// RMC HEADING/SPEED
p0 = (const char *)ident + 29;
s = (const char *)ident + 9+4;
p2 = p;
for ( ; s < p0; ++s ) {
if (*s != ' ')
break;
}
if (s < p0)
*p++ = ' ';
for ( ; s < p0; ++s ) {
if (*s == '*')
break;
*p++ = *s;
}
if (p > p2)
*p++ = ' ';
if (alt_feet > -9999999) {
p += sprintf(p, "/A=%06d", alt_feet);
}
*p = 0;
tnc2buflen = p - tnc2buf;
if (debug) printf("DPRSGW GPS data: %s\n", tnc2buf);
if (!dprsgw_ratelimit( dp, tnc2buf )) {
char *b;
if (aif != NULL) {
igate_to_aprsis( aif->callsign, 0, (const char *)tnc2buf, tnc2addrlen, tnc2buflen, 0, 0);
// Bytes have been counted previously, now count meaningful packet
erlang_add(aif->callsign, ERLANG_RX, 0, 1);
}
char *heads[2];
heads[0] = tnc2buf;
p = heads[0];
heads[1] = NULL;
while (*p != '>' && *p != 0) ++p;
if (*p == '>') {
*p++ = 0;
heads[1] = p;
} else
return; // BAD :-(
p = heads[1];
while (p != NULL && *p != ':' && *p != 0 && *p != ',') ++p;
if (p != NULL && (*p == ':' || *p == ',')) {
*p++ = 0;
}
b = tnc2buf + tnc2addrlen +1;
interface_receive_3rdparty( aif,
heads, 2, "DSTAR*",
b, tnc2buflen - (b-tnc2buf) );
}
}
static void dprsgw_rxigate( struct serialport *S )
{
const struct aprx_interface *aif = S->interface[0];
uint8_t *tnc2addr = S->rdline;
int tnc2addrlen = S->rdlinelen;
uint8_t *tnc2body = S->rdline;
int tnc2bodylen = S->rdlinelen;
#ifndef DPRSGW_DEBUG_MAIN
if (aif == NULL) {
if (debug) printf("OOPS! NO <interface> ON DPRS SERIAL PORT! BUG!\n");
return;
}
#endif
if (memcmp("$$CRC", tnc2addr, 5) == 0 && tnc2addrlen > 20) {
tnc2addr += 10;
tnc2addrlen -= 10;
tnc2bodylen -= 10; // header + body together
tnc2body = memchr( tnc2addr, ':', tnc2addrlen);
if (tnc2body != NULL) {
char *heads[2];
char *s;
tnc2addrlen = tnc2body - tnc2addr;
++tnc2body;
if (dprsgw_ratelimit(S->dprsgw, tnc2addr)) {
// Rate-limit ordered rejection
return;
}
// Acceptable packet, Rx-iGate it!
igate_to_aprsis( aif->callsign, 0, (const char *)tnc2addr, tnc2addrlen, tnc2bodylen, 0, 0);
// Bytes have been counted previously, now count meaningful packet
erlang_add( aif->callsign, ERLANG_RX, 0, 1 );
heads[0] = (char*)tnc2addr;
s = heads[0];
heads[1] = NULL;
while (*s != '>' && *s != 0) ++s;
if (*s == '>') {
*s++ = 0;
heads[1] = s;
} else
return; // BAD :-(
s = heads[1];
while (s != NULL && *s != ':' && *s != 0 && *s != ',') ++s;
if (s != NULL && (*s == ':' || *s == ',')) {
*s++ = 0;
}
interface_receive_3rdparty( aif,
heads, 2, "DSTAR*",
(const char*)tnc2body, tnc2bodylen - (tnc2body-tnc2addr) );
return;
} else {
// Bad packet!
if (debug) printf("Bad DPRS packet! %s\n", S->rdline);
return;
}
} else if (memcmp("$GPGGA,", tnc2addr, 7) == 0) {
dprsgw_t *dp = S->dprsgw;
if (dp->ggaspace <= S->rdlinelen) {
dp->ggaline = realloc(dp->ggaline, S->rdlinelen+1);
dp->ggaspace = S->rdlinelen;
}
memcpy(dp->ggaline, tnc2addr, tnc2bodylen);
dp->ggaline[tnc2bodylen] = 0;
if (debug) printf("DPRS GGA: %s\n", dp->ggaline);
} else if (memcmp("$GPRMC,", tnc2addr, 7) == 0) {
dprsgw_t *dp = S->dprsgw;
if (dp->rmcspace <= S->rdlinelen) {
dp->rmcline = realloc(dp->rmcline, S->rdlinelen+1);
dp->rmcspace = S->rdlinelen;
}
memcpy(dp->rmcline, tnc2addr, tnc2bodylen);
dp->rmcline[tnc2bodylen] = 0;
if (debug) printf("DPRS RMC: %s\n", dp->rmcline);
} else if (tnc2addr[8] == ',' && tnc2bodylen == 29) {
// Acceptable DPRS "ident" line
dprsgw_t *dp = S->dprsgw;
tnc2addr[tnc2bodylen] = 0; // zero-terminate just in case
dprsgw_nmea_igate(aif, tnc2addr, dp);
} else {
// this should never be called...
if (debug) printf("Unrecognized DPRS packet: %s\n", S->rdline);
return;
}
}
/*
* Receive one text line from serial port
* It will end with 0x00 byte, and not contain \r nor \n.
*
* It MAY have junk at the start.
*
*
*/
static void dprsgw_receive( struct serialport *S )
{
int i;
uint8_t *p;
if (debug) dprslog(S->rdline_time, S->rdline);
do {
if (dprsgw_isvalid(S)) {
// Feed it to DPRS-APRS-GATE
dprsgw_rxigate( S );
return; // Done!
} else {
// Not a good packet! See if there is a good packet inside?
dprsgw_flush(S->dprsgw); // bad input -> discard accumulated data
p = memchr(S->rdline+1, '$', S->rdlinelen-1);
if (p == NULL)
break; // No '$' to start something
i = S->rdlinelen - (p - S->rdline);
if (i <= 0)
break; // exhausted!
S->rdlinelen = i;
memcpy(S->rdline, p, S->rdlinelen);
S->rdline[i] = 0;
continue;
}
} while(1);
}
/*
* Receive more data from DPRS type serial port
* This handles correct data accumulation and sync hunting
*/
int dprsgw_pulldprs( struct serialport *S )
{
const time_t rdtime = S->rdline_time;
const struct aprx_interface *aif = S->interface[0];
int c;
int i;
// Account all received bytes, this may or may not be a packet
erlang_add(aif->callsign, ERLANG_RX, S->rdlinelen, 0);
if (S->dprsgw == NULL)
S->dprsgw = dprsgw_new(30); // FIXME: hard-coded 30 second delay for DPRS repeats
if ((rdtime+2 - tick.tv_sec) < 0) {
// A timeout has happen? (2 seconds!) Either data is added constantly,
// or nothing was received from DPRS datastream!
if (S->rdlinelen > 0)
if (debug)printf("dprsgw: previous data is %d sec old, discarding its state: %s\n",((int)(tick.tv_sec-rdtime)), S->rdline);
S->rdline[S->rdlinelen] = 0;
if (S->rdlinelen > 0 && debug) dprslog(rdtime, S->rdline);
S->rdlinelen = 0;
dprsgw_flush(S->dprsgw); // timeout -> discard accumulated data
}
S->rdline_time = tick.tv_sec;
for (i=0 ; ; ++i) {
c = ttyreader_getc(S);
if (c < 0) {
// if (debug) printf("dprsgw_pulldprs: read %d chars\n", i);
return c; /* Out of input.. */
}
if (debug>2) printf("DPRS %ld %3d %02X '%c'\n", tick.tv_sec, S->rdlinelen, c, c);
/* S->dprsstate != 0: read data into S->rdline,
== 0: discard data until CR|LF.
Zero-size read line is discarded as well
(only CR|LF on input frame) */
/* Looking for CR or LF.. */
if (c == '\n' || c == '\r') {
/* End of line seen! */
if (S->rdlinelen > 0) {
/* Non-zero-size string, put terminating 0 byte on it. */
S->rdline[S->rdlinelen] = 0;
dprsgw_receive(S);
}
S->rdlinelen = 0;
continue;
}
// A '$' starts possible data..
if (c == '$' && S->rdlinelen == 0) {
S->rdline[S->rdlinelen++] = c;
continue;
}
// More fits in?
if (S->rdlinelen >= sizeof(S->rdline)-3) {
// Too long a line...
do {
int len;
uint8_t *p;
dprsgw_flush(S->dprsgw);
// Look for first '$' in buffer _after_ first char
p = memchr(S->rdline+1, '$', S->rdlinelen-1);
if (!p) {
S->rdlinelen = 0;
break; // Not found
}
len = S->rdlinelen - (p - S->rdline);
if (len <= 0) {
S->rdlinelen = 0;
break; // exhausted
}
memcpy(S->rdline, p, len);
S->rdline[len] = 0;
S->rdlinelen = len;
if (len >= 3) {
if (memcmp("$$C", S->rdline, 3) != 0 &&
memcmp("$GP", S->rdline, 3) != 0) {
// Not acceptable 3-char prefix
// Eat away the collected prefixes..
continue;
}
}
break;
} while(1);
}
S->rdline[S->rdlinelen++] = c;
/*
// Too short to say anything?
if (S->rdlinelen < 3) {
continue;
}
if (S->rdlinelen == 3 &&
(memcmp("$$C", S->rdline, 3) != 0 &&
memcmp("$GP", S->rdline, 3) != 0)) {
// No correct start, discard...
dprsgw_flush(S->dprsgw);
S->rdlinelen = 2;
memcpy(S->rdline, S->rdline+1, 2);
S->rdline[S->rdlinelen] = 0;
if (S->rdline[0] != '$') {
// Didn't start with a '$'
S->rdlinelen = 0;
}
continue;
}
*/
} /* .. input loop */
return 0; /* not reached */
}
int dprsgw_prepoll(struct aprxpolls *app)
{
return 0; // returns number of sockets filled (ignored at caller)
}
int dprsgw_postpoll(struct aprxpolls *app)
{
return 0; // returns number of sockets filled (ignored at caller)
}
#ifdef DPRSGW_DEBUG_MAIN
int freadln(FILE *fp, char *p, int buflen) // DPRSGW_DEBUG_MAIN
{
int n = 0;
while (!feof(fp)) {
int c = fgetc(fp);
if (c == EOF) break;
if (n >= buflen) break;
*p++ = c;
++n;
if (c == '\n') break;