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dump1090/dump1090.h
Oliver Jowett 1db63ebc65 Add generation of history JSON. 
Add support for URL handlers that match a path prefix.

(cherry picked from commit 38faa510cb881cbf9d2a0a85bbde61130b5259e7)
2015-01-16 20:31:59 +00:00

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// dump1090, a Mode S messages decoder for RTLSDR devices.
//
// Copyright (C) 2012 by Salvatore Sanfilippo <antirez@gmail.com>
//
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
// * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
//
// * Redistributions in binary form must reproduce the above copyright
// notice, this list of conditions and the following disclaimer in the
// documentation and/or other materials provided with the distribution.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
//
#ifndef __DUMP1090_H
#define __DUMP1090_H
// File Version number
// ====================
// Format is : MajorVer.MinorVer.DayMonth.Year"
// MajorVer changes only with significant changes
// MinorVer changes when additional features are added, but not for bug fixes (range 00-99)
// DayDate & Year changes for all changes, including for bug fixes. It represent the release date of the update
//
#ifndef MODES_DUMP1090_VERSION
# define MODES_DUMP1090_VERSION "1.10.3010.14+mu"
#endif
#ifndef MODES_DUMP1090_VARIANT
# define MODES_DUMP1090_VARIANT "dump1090-mutability"
#endif
// ============================= Include files ==========================
#ifndef _WIN32
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <pthread.h>
#include <stdint.h>
#include <errno.h>
#include <unistd.h>
#include <math.h>
#include <sys/time.h>
#include <sys/timeb.h>
#include <signal.h>
#include <fcntl.h>
#include <ctype.h>
#include <sys/stat.h>
#include <sys/ioctl.h>
#include <time.h>
#include <limits.h>
#include "rtl-sdr.h"
#include "anet.h"
#else
#include "winstubs.h" //Put everything Windows specific in here
#include "rtl-sdr.h"
#include "anet.h"
#endif
// ============================= #defines ===============================
//
// If you have a valid coaa.h, these values will come from it. If not,
// then you can enter your own values in the #else section here
//
#ifdef USER_LATITUDE
#define MODES_USER_LATITUDE_DFLT (USER_LATITUDE)
#define MODES_USER_LONGITUDE_DFLT (USER_LONGITUDE)
#else
#define MODES_USER_LATITUDE_DFLT (0.0)
#define MODES_USER_LONGITUDE_DFLT (0.0)
#endif
#define MODES_DEFAULT_PPM 52
#define MODES_DEFAULT_RATE 2000000
#define MODES_OVERSAMPLE_RATE 2400000
#define MODES_DEFAULT_FREQ 1090000000
#define MODES_DEFAULT_WIDTH 1000
#define MODES_DEFAULT_HEIGHT 700
#define MODES_ASYNC_BUF_NUMBER 16
#define MODES_ASYNC_BUF_SIZE (16*16384) // 256k
#define MODES_ASYNC_BUF_SAMPLES (MODES_ASYNC_BUF_SIZE / 2) // Each sample is 2 bytes
#define MODES_AUTO_GAIN -100 // Use automatic gain
#define MODES_MAX_GAIN 999999 // Use max available gain
#define MODES_MSG_SQUELCH_DB 4.0 // Minimum SNR, in dB
#define MODES_MSG_ENCODER_ERRS 3 // Maximum number of encoding errors
// When changing, change also fixBitErrors() and modesInitErrorTable() !!
#define MODES_MAX_BITERRORS 2 // Global max for fixable bit erros
#define MODES_MAX_PHASE_STATS 10
#define MODEAC_MSG_SAMPLES (25 * 2) // include up to the SPI bit
#define MODEAC_MSG_BYTES 2
#define MODEAC_MSG_SQUELCH_LEVEL 0x07FF // Average signal strength limit
#define MODEAC_MSG_FLAG (1<<0)
#define MODEAC_MSG_MODES_HIT (1<<1)
#define MODEAC_MSG_MODEA_HIT (1<<2)
#define MODEAC_MSG_MODEC_HIT (1<<3)
#define MODEAC_MSG_MODEA_ONLY (1<<4)
#define MODEAC_MSG_MODEC_OLD (1<<5)
#define MODES_PREAMBLE_US 8 // microseconds = bits
#define MODES_PREAMBLE_SAMPLES (MODES_PREAMBLE_US * 2)
#define MODES_PREAMBLE_SIZE (MODES_PREAMBLE_SAMPLES * sizeof(uint16_t))
#define MODES_LONG_MSG_BYTES 14
#define MODES_SHORT_MSG_BYTES 7
#define MODES_LONG_MSG_BITS (MODES_LONG_MSG_BYTES * 8)
#define MODES_SHORT_MSG_BITS (MODES_SHORT_MSG_BYTES * 8)
#define MODES_LONG_MSG_SAMPLES (MODES_LONG_MSG_BITS * 2)
#define MODES_SHORT_MSG_SAMPLES (MODES_SHORT_MSG_BITS * 2)
#define MODES_LONG_MSG_SIZE (MODES_LONG_MSG_SAMPLES * sizeof(uint16_t))
#define MODES_SHORT_MSG_SIZE (MODES_SHORT_MSG_SAMPLES * sizeof(uint16_t))
#define MODES_OS_PREAMBLE_SAMPLES (20)
#define MODES_OS_PREAMBLE_SIZE (MODES_OS_PREAMBLE_SAMPLES * sizeof(uint16_t))
#define MODES_OS_LONG_MSG_SAMPLES (268)
#define MODES_OS_SHORT_MSG_SAMPLES (135)
#define MODES_OS_LONG_MSG_SIZE (MODES_LONG_MSG_SAMPLES * sizeof(uint16_t))
#define MODES_OS_SHORT_MSG_SIZE (MODES_SHORT_MSG_SAMPLES * sizeof(uint16_t))
#define MODES_OUT_BUF_SIZE (1500)
#define MODES_OUT_FLUSH_SIZE (MODES_OUT_BUF_SIZE - 256)
#define MODES_OUT_FLUSH_INTERVAL (60)
#define MODES_ICAO_CACHE_LEN 1024 // Power of two required
#define MODES_ICAO_CACHE_TTL 60 // Time to live of cached addresses
#define MODES_UNIT_FEET 0
#define MODES_UNIT_METERS 1
#define MODES_USER_LATLON_VALID (1<<0)
#define MODES_ACFLAGS_LATLON_VALID (1<<0) // Aircraft Lat/Lon is decoded
#define MODES_ACFLAGS_ALTITUDE_VALID (1<<1) // Aircraft altitude is known
#define MODES_ACFLAGS_HEADING_VALID (1<<2) // Aircraft heading is known
#define MODES_ACFLAGS_SPEED_VALID (1<<3) // Aircraft speed is known
#define MODES_ACFLAGS_VERTRATE_VALID (1<<4) // Aircraft vertical rate is known
#define MODES_ACFLAGS_SQUAWK_VALID (1<<5) // Aircraft Mode A Squawk is known
#define MODES_ACFLAGS_CALLSIGN_VALID (1<<6) // Aircraft Callsign Identity
#define MODES_ACFLAGS_EWSPEED_VALID (1<<7) // Aircraft East West Speed is known
#define MODES_ACFLAGS_NSSPEED_VALID (1<<8) // Aircraft North South Speed is known
#define MODES_ACFLAGS_AOG (1<<9) // Aircraft is On the Ground
#define MODES_ACFLAGS_LLEVEN_VALID (1<<10) // Aircraft Even Lot/Lon is known
#define MODES_ACFLAGS_LLODD_VALID (1<<11) // Aircraft Odd Lot/Lon is known
#define MODES_ACFLAGS_AOG_VALID (1<<12) // MODES_ACFLAGS_AOG is valid
#define MODES_ACFLAGS_FS_VALID (1<<13) // Aircraft Flight Status is known
#define MODES_ACFLAGS_NSEWSPD_VALID (1<<14) // Aircraft EW and NS Speed is known
#define MODES_ACFLAGS_LATLON_REL_OK (1<<15) // Indicates it's OK to do a relative CPR
#define MODES_ACFLAGS_LLEITHER_VALID (MODES_ACFLAGS_LLEVEN_VALID | MODES_ACFLAGS_LLODD_VALID)
#define MODES_ACFLAGS_LLBOTH_VALID (MODES_ACFLAGS_LLEVEN_VALID | MODES_ACFLAGS_LLODD_VALID)
#define MODES_ACFLAGS_AOG_GROUND (MODES_ACFLAGS_AOG_VALID | MODES_ACFLAGS_AOG)
#define MODES_DEBUG_DEMOD (1<<0)
#define MODES_DEBUG_DEMODERR (1<<1)
#define MODES_DEBUG_BADCRC (1<<2)
#define MODES_DEBUG_GOODCRC (1<<3)
#define MODES_DEBUG_NOPREAMBLE (1<<4)
#define MODES_DEBUG_NET (1<<5)
#define MODES_DEBUG_JS (1<<6)
// When debug is set to MODES_DEBUG_NOPREAMBLE, the first sample must be
// at least greater than a given level for us to dump the signal.
#define MODES_DEBUG_NOPREAMBLE_LEVEL 25
#define MODES_INTERACTIVE_REFRESH_TIME 250 // Milliseconds
#define MODES_INTERACTIVE_ROWS 22 // Rows on screen
#define MODES_INTERACTIVE_DELETE_TTL 300 // Delete from the list after 300 seconds
#define MODES_INTERACTIVE_DISPLAY_TTL 60 // Delete from display after 60 seconds
#define MODES_NET_HEARTBEAT_INTERVAL 60 // seconds
#define MODES_NET_SERVICES_NUM 7
#define MODES_NET_INPUT_RAW_PORT 30001
#define MODES_NET_OUTPUT_RAW_PORT 30002
#define MODES_NET_OUTPUT_SBS_PORT 30003
#define MODES_NET_INPUT_BEAST_PORT 30004
#define MODES_NET_OUTPUT_BEAST_PORT 30005
#define MODES_NET_HTTP_PORT 8080
#define MODES_NET_OUTPUT_FA_TSV_PORT 10001
#define MODES_CLIENT_BUF_SIZE 1024
#define MODES_NET_SNDBUF_SIZE (1024*64)
#define MODES_NET_SNDBUF_MAX (7)
#ifndef HTMLPATH
#define HTMLPATH "./public_html" // default path for gmap.html etc
#endif
#define MODES_NOTUSED(V) ((void) V)
//======================== structure declarations =========================
// Structure used to describe a networking client
struct client {
struct client* next; // Pointer to next client
int fd; // File descriptor
int service; // TCP port the client is connected to
int buflen; // Amount of data on buffer
char buf[MODES_CLIENT_BUF_SIZE+1]; // Read buffer
};
#define HISTORY_SIZE 240
#define HISTORY_INTERVAL 15
// Structure used to describe an aircraft in iteractive mode
struct aircraft {
uint32_t addr; // ICAO address
char flight[16]; // Flight number
unsigned char signalLevel[8]; // Last 8 Signal Amplitudes
int altitude; // Altitude
int speed; // Velocity
int track; // Angle of flight
int vert_rate; // Vertical rate.
time_t seen; // Time at which the last packet was received
time_t seenLatLon; // Time at which the last lat long was calculated
uint64_t timestamp; // Timestamp at which the last packet was received
uint64_t timestampLatLon;// Timestamp at which the last lat long was calculated
long messages; // Number of Mode S messages received
int modeA; // Squawk
int modeC; // Altitude
long modeAcount; // Mode A Squawk hit Count
long modeCcount; // Mode C Altitude hit Count
int modeACflags; // Flags for mode A/C recognition
int fatsv_emitted_altitude; // last FA emitted altitude
int fatsv_emitted_track; // last FA emitted angle of flight
time_t fatsv_last_emitted; // time aircraft was last FA emitted
// Encoded latitude and longitude as extracted by odd and even CPR encoded messages
int odd_cprlat;
int odd_cprlon;
int even_cprlat;
int even_cprlon;
uint64_t odd_cprtime;
uint64_t even_cprtime;
double lat, lon; // Coordinated obtained from CPR encoded data
int bFlags; // Flags related to valid fields in this structure
struct aircraft *next; // Next aircraft in our linked list
};
// Common stats for non-phase-corrected vs phase-corrected cases
struct demod_stats {
unsigned int demodulated0;
unsigned int demodulated1;
unsigned int demodulated2;
unsigned int demodulated3;
unsigned int goodcrc;
unsigned int goodcrc_byphase[MODES_MAX_PHASE_STATS];
unsigned int badcrc;
unsigned int fixed;
// Histogram of fixed bit errors: index 0 for single bit erros,
// index 1 for double bit errors etc.
unsigned int bit_fix[MODES_MAX_BITERRORS];
};
// Common writer state for all output sockets of one type
struct net_writer {
int socket; // listening socket FD, used to identify the owning service
int connections; // number of active clients
void *data; // shared write buffer, sized MODES_OUT_BUF_SIZE
int dataUsed; // number of bytes of write buffer currently used
time_t lastWrite; // time of last write to clients
};
// Program global state
struct { // Internal state
pthread_t reader_thread;
pthread_mutex_t data_mutex; // Mutex to synchronize buffer access
pthread_cond_t data_cond; // Conditional variable associated
uint16_t *pData [MODES_ASYNC_BUF_NUMBER]; // Raw IQ sample buffers from RTL
struct timeb stSystemTimeRTL[MODES_ASYNC_BUF_NUMBER]; // System time when RTL passed us this block
int iDataIn; // Fifo input pointer
int iDataOut; // Fifo output pointer
int iDataReady; // Fifo content count
int iDataLost; // Count of missed buffers
int trailing_samples;// extra trailing samples in magnitude buffer
uint16_t *pFileData; // Raw IQ samples buffer (from a File)
uint16_t *magnitude; // Magnitude vector
uint64_t timestampBlk; // Timestamp of the start of the current block
struct timeb stSystemTimeBlk; // System time when RTL passed us currently processing this block
int fd; // --ifile option file descriptor
uint32_t *icao_cache; // Recently seen ICAO addresses cache
uint16_t *maglut; // I/Q -> Magnitude lookup table
uint16_t *log10lut; // Magnitude -> log10 lookup table
int exit; // Exit from the main loop when true
// RTLSDR
char * dev_name;
int gain;
int enable_agc;
rtlsdr_dev_t *dev;
int freq;
int ppm_error;
// Networking
char aneterr[ANET_ERR_LEN];
struct client *clients; // Our clients
int ris; // Raw input listening socket
int bis; // Beast input listening socket
int https; // HTTP listening socket
struct net_writer raw_out; // Raw output
struct net_writer beast_out; // Beast-format output
struct net_writer sbs_out; // SBS-format output
struct net_writer fatsv_out; // FATSV-format output
#ifdef _WIN32
WSADATA wsaData; // Windows socket initialisation
#endif
// Configuration
char *filename; // Input form file, --ifile option
int oversample;
int phase_enhance; // Enable phase enhancement if true
int nfix_crc; // Number of crc bit error(s) to correct
int check_crc; // Only display messages with good CRC
int raw; // Raw output format
int beast; // Beast binary format output
int mode_ac; // Enable decoding of SSR Modes A & C
int debug; // Debugging mode
int net; // Enable networking
int net_only; // Enable just networking
int net_heartbeat_interval; // TCP heartbeat interval (seconds)
int net_output_sbs_port; // SBS output TCP port
int net_output_flush_size; // Minimum Size of output data
int net_output_flush_interval; // Maximum interval (in seconds) between outputwrites
int net_output_raw_port; // Raw output TCP port
int net_input_raw_port; // Raw input TCP port
int net_output_beast_port; // Beast output TCP port
int net_input_beast_port; // Beast input TCP port
char *net_bind_address; // Bind address
int net_http_port; // HTTP port
int net_fatsv_port; // FlightAware TSV port
int net_sndbuf_size; // TCP output buffer size (64Kb * 2^n)
int quiet; // Suppress stdout
int interactive; // Interactive mode
int interactive_rows; // Interactive mode: max number of rows
int interactive_display_ttl; // Interactive mode: TTL display
int interactive_delete_ttl; // Interactive mode: TTL before deletion
int stats; // Print stats at exit in --ifile mode
int onlyaddr; // Print only ICAO addresses
int metric; // Use metric units
int mlat; // Use Beast ascii format for raw data output, i.e. @...; iso *...;
int interactive_rtl1090; // flight table in interactive mode is formatted like RTL1090
char *json_dir; // Path to json base directory, or NULL not to write json.
int json_interval; // Interval between rewriting the json aircraft file
int json_location_accuracy; // Accuracy of location metadata: 0=none, 1=approx, 2=exact
int json_aircraft_history_next;
struct {
char *content;
int clen;
} json_aircraft_history[HISTORY_SIZE];
// User details
double fUserLat; // Users receiver/antenna lat/lon needed for initial surface location
double fUserLon; // Users receiver/antenna lat/lon needed for initial surface location
int bUserFlags; // Flags relating to the user details
double maxRange; // Absolute maximum decoding range, in *metres*
// Interactive mode
struct aircraft *aircrafts;
uint64_t interactive_last_update; // Last screen update in milliseconds
time_t last_cleanup_time; // Last cleanup time in seconds
// Statistics
unsigned int stat_preamble_no_correlation;
unsigned int stat_preamble_not_quiet;
unsigned int stat_valid_preamble;
unsigned int stat_preamble_phase[MODES_MAX_PHASE_STATS];
struct demod_stats stat_demod;
struct demod_stats stat_demod_phasecorrected;
unsigned int stat_http_requests;
unsigned int stat_out_of_phase;
unsigned int stat_DF_Len_Corrected;
unsigned int stat_DF_Type_Corrected;
unsigned int stat_ModeAC;
unsigned int stat_blocks_processed;
unsigned int stat_blocks_dropped;
struct timespec stat_cputime;
// total messages:
unsigned int stat_messages_total;
} Modes;
// The struct we use to store information about a decoded message.
struct modesMessage {
// Generic fields
unsigned char msg[MODES_LONG_MSG_BYTES]; // Binary message.
int msgbits; // Number of bits in message
int msgtype; // Downlink format #
int crcok; // True if CRC was valid
uint32_t crc; // Message CRC
int correctedbits; // No. of bits corrected
char corrected[MODES_MAX_BITERRORS]; // corrected bit positions
uint32_t addr; // ICAO Address from bytes 1 2 and 3
int phase_corrected; // True if phase correction was applied
uint64_t timestampMsg; // Timestamp of the message
int remote; // If set this message is from a remote station
unsigned char signalLevel; // Signal Amplitude
// DF 11
int ca; // Responder capabilities
int iid;
// DF 17, DF 18
int metype; // Extended squitter message type.
int mesub; // Extended squitter message subtype.
int heading; // Reported by aircraft, or computed from from EW and NS velocity
int raw_latitude; // Non decoded latitude.
int raw_longitude; // Non decoded longitude.
double fLat; // Coordinates obtained from CPR encoded data if/when decoded
double fLon; // Coordinates obtained from CPR encoded data if/when decoded
char flight[16]; // 8 chars flight number.
int ew_velocity; // E/W velocity.
int ns_velocity; // N/S velocity.
int vert_rate; // Vertical rate.
int velocity; // Reported by aircraft, or computed from from EW and NS velocity
// DF4, DF5, DF20, DF21
int fs; // Flight status for DF4,5,20,21
int modeA; // 13 bits identity (Squawk).
// Fields used by multiple message types.
int altitude;
int unit;
int bFlags; // Flags related to fields in this structure
};
// ======================== function declarations =========================
#ifdef __cplusplus
extern "C" {
#endif
//
// Functions exported from mode_ac.c
//
int detectModeA (uint16_t *m, struct modesMessage *mm);
void decodeModeAMessage(struct modesMessage *mm, int ModeA);
int ModeAToModeC (unsigned int ModeA);
//
// Functions exported from mode_s.c
//
void detectModeS (uint16_t *m, uint32_t mlen);
void detectModeS_oversample (uint16_t *m, uint32_t mlen);
void decodeModesMessage (struct modesMessage *mm, unsigned char *msg);
void displayModesMessage(struct modesMessage *mm);
void useModesMessage (struct modesMessage *mm);
void computeMagnitudeVector(uint16_t *pData);
int decodeCPR (struct aircraft *a, int fflag, int surface);
int decodeCPRrelative (struct aircraft *a, int fflag, int surface);
void modesInitErrorInfo ();
//
// Functions exported from interactive.c
//
struct aircraft* interactiveReceiveData(struct modesMessage *mm);
void interactiveShowData(void);
void interactiveRemoveStaleAircrafts(void);
int decodeBinMessage (struct client *c, char *p);
struct aircraft *interactiveFindAircraft(uint32_t addr);
//
// Functions exported from net_io.c
//
void modesInitNet (void);
void modesQueueOutput (struct modesMessage *mm);
void modesReadFromClient(struct client *c, char *sep, int(*handler)(struct client *, char *));
void modesNetPeriodicWork (void);
void writeJsonToFile(const char *file, char * (*generator) (const char*,int*));
char *generateAircraftJson(const char *url_path, int *len);
char *generateReceiverJson(const char *url_path, int *len);
char *generateHistoryJson(const char *url_path, int *len);
#ifdef __cplusplus
}
#endif
#endif // __DUMP1090_H
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