├── udevrules └── 99-co2mon.rules ├── graph ├── rrd │ ├── update_graph.sh │ ├── update_data.sh │ ├── index.html │ └── Makefile ├── collectd │ ├── co2mon.conf.example │ └── co2mon.py └── munin │ └── co2mon ├── .travis.yml ├── .gitignore ├── CMakeLists.txt ├── co2mond ├── CMakeLists.txt └── src │ └── main.c ├── libco2mon ├── include │ ├── config.h.in │ └── co2mon.h ├── CMakeLists.txt └── src │ └── co2mon.c ├── README.md └── LICENSE /udevrules/99-co2mon.rules: -------------------------------------------------------------------------------- 1 | SUBSYSTEM=="usb", ATTR{idVendor}=="04d9", ATTR{idProduct}=="a052", MODE="0666" 2 | -------------------------------------------------------------------------------- /graph/rrd/update_graph.sh: -------------------------------------------------------------------------------- 1 | #!/bin/bash 2 | while true; do 3 | make graph-all-1d.png 4 | for i in {1..12}; do 5 | make graph-all-1h.png 6 | sleep 5 7 | done 8 | done 9 | -------------------------------------------------------------------------------- /.travis.yml: -------------------------------------------------------------------------------- 1 | language: c 2 | dist: trusty 3 | compiler: 4 | - clang 5 | - gcc 6 | addons: 7 | apt: 8 | packages: 9 | - cmake 10 | - libhidapi-dev 11 | script: mkdir build && cd build && cmake .. && cmake --build . 12 | -------------------------------------------------------------------------------- /.gitignore: -------------------------------------------------------------------------------- 1 | /build 2 | /graph/graph-56-1d.png 3 | /graph/graph-56-1h.png 4 | /graph/graph-6d-1d.png 5 | /graph/graph-6d-1h.png 6 | /graph/graph-co2-1d.png 7 | /graph/graph-co2-1h.png 8 | /graph/graph-temp-1d.png 9 | /graph/graph-temp-1h.png 10 | /graph/graph.rrd 11 | 12 | -------------------------------------------------------------------------------- /graph/collectd/co2mon.conf.example: -------------------------------------------------------------------------------- 1 | # Don't forget to 'LoadPlugin python' or 'AutoLoadPlugin true' 2 | 3 | 4 | ModulePath "/etc/collectd_python_plugins" 5 | LogTraces true 6 | Interactive false 7 | Import "co2mon" 8 | 9 | # 10 | # #This is default value 11 | # datadir "/var/lib/co2mon/" 12 | # 13 | 14 | 15 | -------------------------------------------------------------------------------- /graph/rrd/update_data.sh: -------------------------------------------------------------------------------- 1 | #!/bin/sh 2 | last_co2=U 3 | last_temp=U 4 | 5 | update_rrd() { 6 | rrdtool update graph.rrd --template CO2:TEMP -- N:$last_co2:$last_temp 7 | } 8 | 9 | ../../build/co2mond/co2mond | while read -r name value; do 10 | echo "$name $value" 11 | if [ "$name" = "CntR" ]; then 12 | last_co2=$value 13 | update_rrd 14 | elif [ "$name" = "Tamb" ]; then 15 | last_temp=$value 16 | update_rrd 17 | fi 18 | done 19 | -------------------------------------------------------------------------------- /CMakeLists.txt: -------------------------------------------------------------------------------- 1 | project(co2mon) 2 | cmake_minimum_required(VERSION 2.8) 3 | 4 | # Known configuration points: 5 | # 6 | # -DBUILD_SHARED_LIBS=OFF 7 | # -DCMAKE_INSTALL_BINDIR=bin 8 | # -DCMAKE_INSTALL_LIBDIR=lib 9 | # 10 | # More variables you may find at https://cmake.org/Wiki/CMake_Useful_Variables 11 | 12 | include(GNUInstallDirs) 13 | 14 | set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -std=c99") 15 | set(CMAKE_C_FLAGS_DEBUG "${CMAKE_C_FLAGS_DEBUG} -Wall -Wextra") 16 | 17 | add_subdirectory(libco2mon) 18 | add_subdirectory(co2mond) 19 | -------------------------------------------------------------------------------- /graph/rrd/index.html: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 |

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19 | 20 | 21 | 22 | -------------------------------------------------------------------------------- /co2mond/CMakeLists.txt: -------------------------------------------------------------------------------- 1 | project(co2mond) 2 | cmake_minimum_required(VERSION 2.8) 3 | 4 | find_package(PkgConfig) 5 | pkg_search_module(HIDAPI REQUIRED hidapi-libusb hidapi) 6 | 7 | include_directories( 8 | ../libco2mon/include 9 | ${HIDAPI_INCLUDE_DIRS}) 10 | 11 | link_directories(${HIDAPI_LIBRARY_DIRS}) 12 | 13 | aux_source_directory(src SRC_LIST) 14 | add_executable(co2mond ${SRC_LIST}) 15 | target_link_libraries(co2mond 16 | co2mon 17 | pthread 18 | ${HIDAPI_LIBRARIES}) 19 | 20 | install(TARGETS co2mond 21 | RUNTIME DESTINATION ${CMAKE_INSTALL_BINDIR}) 22 | -------------------------------------------------------------------------------- /libco2mon/include/config.h.in: -------------------------------------------------------------------------------- 1 | /* 2 | * co2mon - programming interface to CO2 sensor. 3 | * Copyright (C) 2015 Oleg Bulatov 4 | * 5 | * This program is free software: you can redistribute it and/or modify 6 | * it under the terms of the GNU General Public License as published by 7 | * the Free Software Foundation, either version 3 of the License, or 8 | * (at your option) any later version. 9 | * 10 | * This program is distributed in the hope that it will be useful, 11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of 12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 13 | * GNU General Public License for more details. 14 | * 15 | * You should have received a copy of the GNU General Public License 16 | * along with this program. If not, see . 17 | */ 18 | #ifndef CO2_MON_CONFIG_H_INCLUDED_ 19 | #define CO2_MON_CONFIG_H_INCLUDED_ 20 | 21 | #cmakedefine HAVE_LIBUSB_STRERROR 1 22 | 23 | #endif 24 | -------------------------------------------------------------------------------- /graph/collectd/co2mon.py: -------------------------------------------------------------------------------- 1 | import collectd 2 | import os 3 | 4 | CO2MOND_DATADIR = '/var/lib/co2mon/' 5 | vl = collectd.Values(plugin='co2mon') 6 | 7 | def read_metric(name): 8 | v = open(os.path.join(CO2MOND_DATADIR, name)).read() 9 | try: 10 | return int(v) 11 | except ValueError: 12 | return float(v) 13 | 14 | 15 | def read_callback(data=None): 16 | global vl 17 | try: 18 | heartbeat = read_metric('heartbeat') 19 | except: 20 | heartbeat = None 21 | if heartbeat: 22 | if heartbeat > vl.time: 23 | vl.time = heartbeat 24 | else: 25 | return 26 | co2 = [read_metric('CntR')] 27 | temp = [read_metric('Tamb')] 28 | vl.dispatch(values=co2, type='gauge', type_instance='co2_ppm') 29 | vl.dispatch(values=temp, type='temperature') 30 | 31 | 32 | def configure_callback(conf): 33 | global CO2MOND_DATADIR 34 | for c in conf.children: 35 | if c.key == 'datadir': 36 | CO2MOND_DATADIR = c.values[0] 37 | 38 | 39 | collectd.register_read(read_callback) 40 | collectd.register_config(configure_callback) 41 | -------------------------------------------------------------------------------- /libco2mon/CMakeLists.txt: -------------------------------------------------------------------------------- 1 | project(libco2mon) 2 | cmake_minimum_required(VERSION 2.8) 3 | 4 | find_package(PkgConfig) 5 | # hidapi-libusb - Ubuntu 14.04 (trusty) 6 | # hidapi - homebrew on OS X 10.10 (Yosemite) 7 | pkg_search_module(HIDAPI REQUIRED hidapi-libusb hidapi) 8 | 9 | include_directories( 10 | include 11 | ${CMAKE_CURRENT_BINARY_DIR}/include 12 | ${HIDAPI_INCLUDE_DIRS}) 13 | 14 | link_directories( 15 | ${HIDAPI_LIBRARY_DIRS}) 16 | 17 | include(CheckSymbolExists) 18 | set(CMAKE_REQUIRED_INCLUDES ${HIDAPI_INCLUDE_DIRS}) 19 | set(CMAKE_REQUIRED_LIBRARIES ${HIDAPI_LIBRARIES}) 20 | check_symbol_exists(libusb_strerror "libusb.h" HAVE_HIDAPI_STRERROR) 21 | set(CMAKE_REQUIRED_INCLUDES) 22 | set(CMAKE_REQUIRED_LIBRARIES) 23 | 24 | configure_file( 25 | ${CMAKE_CURRENT_SOURCE_DIR}/include/config.h.in 26 | ${CMAKE_CURRENT_BINARY_DIR}/include/config.h) 27 | 28 | aux_source_directory(src SRC_LIST) 29 | add_library(co2mon ${SRC_LIST}) 30 | target_link_libraries(co2mon 31 | ${HIDAPI_LIBRARIES}) 32 | set_target_properties(co2mon PROPERTIES 33 | SOVERSION 1) 34 | 35 | install(TARGETS co2mon 36 | LIBRARY DESTINATION ${CMAKE_INSTALL_LIBDIR} 37 | ARCHIVE DESTINATION ${CMAKE_INSTALL_LIBDIR}) 38 | install(FILES include/co2mon.h 39 | DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}) 40 | 41 | -------------------------------------------------------------------------------- /libco2mon/include/co2mon.h: -------------------------------------------------------------------------------- 1 | /* 2 | * co2mon - programming interface to CO2 sensor. 3 | * Copyright (C) 2015 Oleg Bulatov 4 | * 5 | * This program is free software: you can redistribute it and/or modify 6 | * it under the terms of the GNU General Public License as published by 7 | * the Free Software Foundation, either version 3 of the License, or 8 | * (at your option) any later version. 9 | * 10 | * This program is distributed in the hope that it will be useful, 11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of 12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 13 | * GNU General Public License for more details. 14 | * 15 | * You should have received a copy of the GNU General Public License 16 | * along with this program. If not, see . 17 | */ 18 | #ifndef CO2MON_H_INCLUDED_ 19 | #define CO2MON_H_INCLUDED_ 20 | 21 | #include 22 | 23 | typedef hid_device *co2mon_device; 24 | 25 | typedef unsigned char co2mon_data_t[8]; 26 | 27 | extern int 28 | co2mon_init(int); 29 | 30 | extern void 31 | co2mon_exit(); 32 | 33 | extern co2mon_device 34 | co2mon_open_device(); 35 | 36 | extern co2mon_device 37 | co2mon_open_device_path(const char *path); 38 | 39 | extern void 40 | co2mon_close_device(co2mon_device dev); 41 | 42 | extern int 43 | co2mon_device_path(co2mon_device dev, char *str, size_t maxlen); 44 | 45 | extern int 46 | co2mon_send_magic_table(co2mon_device dev, co2mon_data_t magic_table); 47 | 48 | extern int 49 | co2mon_read_data(co2mon_device dev, co2mon_data_t magic_table, co2mon_data_t result); 50 | 51 | #endif 52 | -------------------------------------------------------------------------------- /graph/rrd/Makefile: -------------------------------------------------------------------------------- 1 | graph.rrd: 2 | # 17280 = 24*60*60/5 3 | # 12 = 60/5 4 | # 43200 = 30*24*60*60/60 5 | rrdtool create $@ --step 5 \ 6 | \ 7 | DS:CO2:GAUGE:60:0:3000 \ 8 | DS:TEMP:GAUGE:60:0:40 \ 9 | DS:x6d:GAUGE:60:0:3000 \ 10 | DS:x56:GAUGE:60:8000:10000 \ 11 | \ 12 | RRA:AVERAGE:0:1:17280 \ 13 | RRA:AVERAGE:0.5:12:43200 14 | 15 | graph-all-1h.png: graph.rrd 16 | rrdtool graph graph-co2-1h.png --start end-1h --end now --width 600 --height 300 --alt-autoscale --alt-y-grid \ 17 | DEF:co2=$^:CO2:AVERAGE \ 18 | 'LINE:co2#0000ff:co2 line' 19 | rrdtool graph graph-temp-1h.png --start end-1h --end now --width 600 --height 300 --alt-autoscale --alt-y-grid \ 20 | DEF:temp=$^:TEMP:AVERAGE \ 21 | 'LINE:temp#00ff00:temp line' 22 | rrdtool graph graph-6d-1h.png --start end-1h --end now --width 600 --height 300 --alt-autoscale --alt-y-grid \ 23 | DEF:x6d=$^:x6d:AVERAGE \ 24 | 'LINE:x6d#ff0000:x6d line' 25 | rrdtool graph graph-56-1h.png --start end-1h --end now --width 600 --height 300 --alt-autoscale --alt-y-grid \ 26 | DEF:x56=$^:x56:AVERAGE \ 27 | 'LINE:x56#00ffff:x56 line' 28 | 29 | graph-all-1d.png: graph.rrd 30 | rrdtool graph graph-co2-1d.png --start end-1d --end now --width 1200 --height 400 --alt-autoscale --alt-y-grid \ 31 | DEF:co2=$^:CO2:AVERAGE \ 32 | 'LINE:co2#0000ff:co2 line' 33 | rrdtool graph graph-temp-1d.png --start end-1d --end now --width 1200 --height 400 --alt-autoscale --alt-y-grid \ 34 | DEF:temp=$^:TEMP:AVERAGE \ 35 | 'LINE:temp#00ff00:temp line' 36 | rrdtool graph graph-6d-1d.png --start end-1d --end now --width 1200 --height 400 --alt-autoscale --alt-y-grid \ 37 | DEF:x6d=$^:x6d:AVERAGE \ 38 | 'LINE:x6d#ff0000:x6d line' 39 | rrdtool graph graph-56-1d.png --start end-1d --end now --width 1200 --height 400 --alt-autoscale --alt-y-grid \ 40 | DEF:x56=$^:x56:AVERAGE \ 41 | 'LINE:x56#00ffff:x56 line' 42 | -------------------------------------------------------------------------------- /graph/munin/co2mon: -------------------------------------------------------------------------------- 1 | #!/bin/sh 2 | # -*- sh -*- 3 | 4 | : << =cut 5 | 6 | =head1 NAME 7 | 8 | co2mon - Plugin to monitor MT8057 (RAD-0301) CO2 ppm and temperature values. 9 | 10 | =head1 NOTES 11 | 12 | 13 | =head1 CONFIGURATION 14 | 15 | The following environment variables are used by this plugin: 16 | 17 | co2_warning - Warning CO2 ppm (Default: 800) 18 | co2_critical - Critical CO2 ppm (Default: 1200) 19 | temp_warning - Warning temp (Default: 30) 20 | temp_critical - Critical temp (Default: 35) 21 | 22 | =head1 MAGIC MARKERS: 23 | 24 | #%# family=auto 25 | #%# capabilities=autoconf 26 | 27 | =cut 28 | 29 | . $MUNIN_LIBDIR/plugins/plugin.sh 30 | is_multigraph 31 | 32 | DATADIR='/var/lib/co2mon' 33 | CO2_FILE="$DATADIR/CntR" 34 | TEMP_FILE="$DATADIR/Tamb" 35 | HEARTBEAT_FILE="$DATADIR/heartbeat" 36 | 37 | print_values() { 38 | read co2 < "$CO2_FILE" 39 | read temp < "$TEMP_FILE" 40 | read heartbeat_sec < "$HEARTBEAT_FILE" 41 | 42 | echo 'multigraph co2mon' 43 | echo "co2.value ${heartbeat_sec:+$heartbeat_sec:}${co2:-U}" 44 | echo 'multigraph co2mon_temp' 45 | echo "temp.value ${heartbeat_sec:+$heartbeat_sec:}${temp:-U}" 46 | } 47 | 48 | if [ "$1" = "autoconf" ]; then 49 | if [ -s "$CO2_FILE" -o -s "$TEMP_FILE" ] ; then 50 | echo yes 51 | else 52 | echo no 53 | fi 54 | exit 0 55 | fi 56 | 57 | if [ "$1" = "config" ]; then 58 | echo 'multigraph co2mon' 59 | echo "graph_title CO2 ppm" 60 | # echo 'graph_args --upper-limit 3000 -l 0' 61 | echo 'graph_vlabel ppm' 62 | # echo 'graph_scale no' 63 | echo 'graph_category sensors' 64 | echo "co2.label CO2 ppm" 65 | co2_warning=${co2_warning:-800} 66 | co2_critical=${co2_critical:-1200} 67 | print_thresholds 'co2' 68 | 69 | echo 'multigraph co2mon_temp' 70 | echo "graph_title Temperature" 71 | # echo 'graph_args --upper-limit 100 -l -10' 72 | echo 'graph_vlabel Degreess Celsius' 73 | # echo 'graph_scale no' 74 | echo 'graph_category sensors' 75 | echo "temp.label temp" 76 | temp_warning=${temp_warning:-30} 77 | temp_critical=${temp_critical:-35} 78 | print_thresholds 'temp' 79 | 80 | exit 0 81 | fi 82 | 83 | print_values 84 | -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | # Software for CO2 Monitor 2 | 3 | ## Compatible Devices 4 | 5 | This software supports compact USB-powered CO2 meters that identify as: 6 | 7 | ``` 8 | idVendor 0x04d9 Holtek Semiconductor, Inc. 9 | idProduct 0xa052 USB-zyTemp 10 | ``` 11 | 12 | A of 2023, there are two revisions of these product on the 13 | market, that can be distinguished by its serial and release 14 | numbers: 15 | 16 | ``` 17 | ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ 18 | old new 19 | ―――――――――――――――――――――――――――――――――― 20 | serial_number 1.40 2.00 21 | release_number 0x0100 0x0200 22 | ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ 23 | ``` 24 | 25 | (where serial_number == iSerial and release_number == bcdDevice) 26 | 27 | The co2mon software tries to auto-detect them, but its also possible to 28 | override the detection (cf. the `-N` and `-n` options). 29 | 30 | Note that these devices are rebranded by vendors such as TFA and 31 | thus are available online under different product names (e.g. 32 | sold by Amazon, as of 2023). Even if one user reported success 33 | with a certain product, the vendor might have silently switched 34 | to a completely different and unsupported hardware without 35 | changing the product name, at any time. 36 | 37 | List of user reported devices that worked in the past: 38 | 39 | - TFA AIRCO2NTROL MINI CO2 Monitor (EAN 4009816027351), via 40 | Amazon.de, 2023 41 | 42 | 43 | ## Installation 44 | 45 | ### Arch Linux 46 | [There is PKGBUILD in AUR](https://aur.archlinux.org/packages/co2mon-git/). The simplest way to [install](https://wiki.archlinux.org/index.php/Arch_User_Repository#Installing_packages) is using yaourt: 47 | 48 | `yaourt -S co2mon-git` 49 | 50 | ### Fedora GNU/Linux and RHEL/CentOS/Scientific Linux 51 | co2mon packages can be installed from official repo: 52 | 53 | `dnf install co2mon` 54 | 55 | ### From Source 56 | 57 | # macOS 58 | brew install cmake pkg-config hidapi 59 | 60 | # Ubuntu 61 | apt-get install cmake g++ pkg-config libhidapi-dev 62 | 63 | mkdir build 64 | cd build 65 | cmake .. 66 | make 67 | ./co2mond/co2mond 68 | 69 | ## See also 70 | 71 | * [ZyAura ZG01C Module Manual](http://www.zyaura.com/support/manual/pdf/ZyAura_CO2_Monitor_ZG01C_Module_ApplicationNote_141120.pdf) 72 | * [RevSpace CO2 Meter Hacking](https://revspace.nl/CO2MeterHacking) 73 | * [Photos of the device and the circuit board](http://habrahabr.ru/company/masterkit/blog/248403/) 74 | -------------------------------------------------------------------------------- /libco2mon/src/co2mon.c: -------------------------------------------------------------------------------- 1 | /* 2 | * co2mon - programming interface to CO2 sensor. 3 | * Copyright (C) 2015 Oleg Bulatov 4 | * 5 | * This program is free software: you can redistribute it and/or modify 6 | * it under the terms of the GNU General Public License as published by 7 | * the Free Software Foundation, either version 3 of the License, or 8 | * (at your option) any later version. 9 | * 10 | * This program is distributed in the hope that it will be useful, 11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of 12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 13 | * GNU General Public License for more details. 14 | * 15 | * You should have received a copy of the GNU General Public License 16 | * along with this program. If not, see . 17 | */ 18 | 19 | #include 20 | #include 21 | #include 22 | 23 | #include "co2mon.h" 24 | 25 | static int decode_data = -1; 26 | 27 | int 28 | co2mon_init(int decode) 29 | { 30 | int r = hid_init(); 31 | if (r < 0) 32 | { 33 | fprintf(stderr, "hid_init: error\n"); 34 | } 35 | decode_data = decode; 36 | return r; 37 | } 38 | 39 | void 40 | co2mon_exit() 41 | { 42 | int r = hid_exit(); 43 | if (r < 0) 44 | { 45 | fprintf(stderr, "hid_exit: error\n"); 46 | } 47 | } 48 | 49 | hid_device * 50 | co2mon_open_device() 51 | { 52 | hid_device *dev = hid_open(0x04d9, 0xa052, NULL); 53 | if (!dev) 54 | { 55 | fprintf(stderr, "hid_open: error\n"); 56 | } 57 | else if (decode_data == -1) 58 | { 59 | struct hid_device_info *hdi = hid_get_device_info(dev); 60 | if (hdi && hdi->release_number > 0x0100) { 61 | decode_data = 0; 62 | } else { 63 | decode_data = 1; 64 | } 65 | } 66 | return dev; 67 | } 68 | 69 | hid_device * 70 | co2mon_open_device_path(const char *path) 71 | { 72 | hid_device *dev = hid_open_path(path); 73 | if (!dev) 74 | { 75 | fprintf(stderr, "hid_open_path: error\n"); 76 | } 77 | return dev; 78 | } 79 | 80 | void 81 | co2mon_close_device(hid_device *dev) 82 | { 83 | hid_close(dev); 84 | } 85 | 86 | int 87 | co2mon_device_path(hid_device *dev, char *str, size_t maxlen) 88 | { 89 | str[0] = '\0'; 90 | return 1; 91 | } 92 | 93 | int 94 | co2mon_send_magic_table(hid_device *dev, co2mon_data_t magic_table) 95 | { 96 | int r = hid_send_feature_report(dev, magic_table, sizeof(co2mon_data_t)); 97 | if (r < 0 || r != sizeof(co2mon_data_t)) 98 | { 99 | fprintf(stderr, "hid_send_feature_report: error\n"); 100 | return 0; 101 | } 102 | return 1; 103 | } 104 | 105 | static void 106 | swap_char(unsigned char *a, unsigned char *b) 107 | { 108 | unsigned char tmp = *a; 109 | *a = *b; 110 | *b = tmp; 111 | } 112 | 113 | static void 114 | decode_buf(co2mon_data_t result, co2mon_data_t buf, co2mon_data_t magic_table) 115 | { 116 | if (decode_data) { 117 | swap_char(&buf[0], &buf[2]); 118 | swap_char(&buf[1], &buf[4]); 119 | swap_char(&buf[3], &buf[7]); 120 | swap_char(&buf[5], &buf[6]); 121 | 122 | for (int i = 0; i < 8; ++i) 123 | { 124 | buf[i] ^= magic_table[i]; 125 | } 126 | 127 | unsigned char tmp = (buf[7] << 5); 128 | result[7] = (buf[6] << 5) | (buf[7] >> 3); 129 | result[6] = (buf[5] << 5) | (buf[6] >> 3); 130 | result[5] = (buf[4] << 5) | (buf[5] >> 3); 131 | result[4] = (buf[3] << 5) | (buf[4] >> 3); 132 | result[3] = (buf[2] << 5) | (buf[3] >> 3); 133 | result[2] = (buf[1] << 5) | (buf[2] >> 3); 134 | result[1] = (buf[0] << 5) | (buf[1] >> 3); 135 | result[0] = tmp | (buf[0] >> 3); 136 | 137 | const unsigned char magic_word[8] = "Htemp99e"; 138 | for (int i = 0; i < 8; ++i) 139 | { 140 | result[i] -= (magic_word[i] << 4) | (magic_word[i] >> 4); 141 | } 142 | } else memcpy(result, buf, 8); 143 | } 144 | 145 | int 146 | co2mon_read_data(hid_device *dev, co2mon_data_t magic_table, co2mon_data_t result) 147 | { 148 | co2mon_data_t data = { 0 }; 149 | int actual_length = hid_read_timeout(dev, data, sizeof(co2mon_data_t), 5000 /* milliseconds */); 150 | if (actual_length < 0) 151 | { 152 | fprintf(stderr, "hid_read_timeout: error\n"); 153 | return actual_length; 154 | } 155 | if (actual_length != sizeof(co2mon_data_t)) 156 | { 157 | fprintf(stderr, "hid_read_timeout: transferred %d bytes, expected %lu bytes\n", actual_length, (unsigned long)sizeof(co2mon_data_t)); 158 | return 0; 159 | } 160 | 161 | decode_buf(result, data, magic_table); 162 | return actual_length; 163 | } 164 | -------------------------------------------------------------------------------- /co2mond/src/main.c: -------------------------------------------------------------------------------- 1 | /* 2 | * co2mon - programming interface to CO2 sensor. 3 | * Copyright (C) 2015 Oleg Bulatov 4 | * 5 | * This program is free software: you can redistribute it and/or modify 6 | * it under the terms of the GNU General Public License as published by 7 | * the Free Software Foundation, either version 3 of the License, or 8 | * (at your option) any later version. 9 | * 10 | * This program is distributed in the hope that it will be useful, 11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of 12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 13 | * GNU General Public License for more details. 14 | * 15 | * You should have received a copy of the GNU General Public License 16 | * along with this program. If not, see . 17 | */ 18 | 19 | #define _XOPEN_SOURCE 700 /* strnlen */ 20 | #define _BSD_SOURCE /* daemon() in glibc before 2.19 */ 21 | #define _DEFAULT_SOURCE /* _BSD_SOURCE is deprecated in glibc 2.19+ */ 22 | #define _DARWIN_C_SOURCE /* daemon() on macOS */ 23 | 24 | #include 25 | #include 26 | #include 27 | #include 28 | #include 29 | #include 30 | #include 31 | #include 32 | #include 33 | #include 34 | #include 35 | #include 36 | #include 37 | #include 38 | 39 | #include "co2mon.h" 40 | 41 | #define CODE_TAMB 0x42 /* Ambient Temperature */ 42 | #define CODE_CNTR 0x50 /* Relative Concentration of CO2 */ 43 | 44 | #define PATH_MAX 4096 45 | #define VALUE_MAX 20 46 | 47 | int daemonize = 0; 48 | int print_unknown = 0; 49 | static int decode_data = -1; /* -1 == auto-detect old/new release devices */ 50 | const char *devicefile = NULL; 51 | char *datadir; 52 | 53 | struct co2mon_state { 54 | uint16_t data[256]; 55 | uint8_t seen[32]; 56 | time_t heatbeat; 57 | unsigned int deverr; 58 | }; 59 | 60 | pthread_mutex_t state_mutex = PTHREAD_MUTEX_INITIALIZER; 61 | struct co2mon_state co2mon; 62 | 63 | static int 64 | bitarr_isset(uint8_t* bitarr, unsigned int ndx) 65 | { 66 | return bitarr[ndx >> 3] & (1u << (ndx & 0x07u)) ? 1 : 0; 67 | } 68 | 69 | static void 70 | bitarr_set(uint8_t* bitarr, unsigned int ndx) 71 | { 72 | bitarr[ndx >> 3] |= 1u << (ndx & 0x07u); 73 | } 74 | 75 | static void 76 | state_lock() 77 | { 78 | if (pthread_mutex_lock(&state_mutex) != 0) 79 | { 80 | err(EXIT_FAILURE, "pthread_mutex_lock"); 81 | } 82 | } 83 | 84 | static void 85 | state_unlock() 86 | { 87 | if (pthread_mutex_unlock(&state_mutex) != 0) 88 | { 89 | err(EXIT_FAILURE, "pthread_mutex_unlock"); 90 | } 91 | } 92 | 93 | static int 94 | lock(int fd, short int type) 95 | { 96 | struct flock lock; 97 | lock.l_start = 0; 98 | lock.l_len = 0; 99 | lock.l_whence = SEEK_SET; 100 | lock.l_type = type; 101 | return fcntl(fd, F_SETLKW, &lock); 102 | } 103 | 104 | static double 105 | decode_temperature(uint16_t w) 106 | { 107 | return (double)w * 0.0625 - 273.15; 108 | } 109 | 110 | static int 111 | write_data(int fd, const char *value) 112 | { 113 | char data[VALUE_MAX + 1]; 114 | snprintf(data, VALUE_MAX + 1, "%s\n", value); 115 | 116 | if (lock(fd, F_WRLCK) != 0) 117 | { 118 | perror("lock"); 119 | return 0; 120 | } 121 | 122 | if (ftruncate(fd, 0) != 0) 123 | { 124 | perror("ftruncate"); 125 | return 0; 126 | } 127 | 128 | ssize_t len = strnlen(data, VALUE_MAX + 1); 129 | if (write(fd, data, len) != len) 130 | { 131 | perror("write"); 132 | return 0; 133 | } 134 | 135 | if (lock(fd, F_UNLCK) != 0) 136 | { 137 | perror("unlock"); 138 | return 0; 139 | } 140 | 141 | return 1; 142 | } 143 | 144 | static int 145 | write_value(const char *name, const char *value) 146 | { 147 | if (!datadir) 148 | { 149 | return 1; 150 | } 151 | 152 | char filename[PATH_MAX]; 153 | snprintf(filename, PATH_MAX, "%s/%s", datadir, name); 154 | 155 | int fd = open(filename, O_CREAT | O_WRONLY, 0666); 156 | if (fd == -1) 157 | { 158 | perror(filename); 159 | return 0; 160 | } 161 | 162 | int result = write_data(fd, value); 163 | close(fd); 164 | return result; 165 | } 166 | 167 | static void 168 | write_heartbeat() 169 | { 170 | char buf[VALUE_MAX]; 171 | const time_t now = time(0); 172 | snprintf(buf, VALUE_MAX, "%lld", (long long)now); 173 | write_value("heartbeat", buf); 174 | state_lock(); 175 | co2mon.heatbeat = now; 176 | state_unlock(); 177 | } 178 | 179 | static int 180 | read_match_path(FILE* fd) 181 | { 182 | // Prefix has no \r\n to support HTTP/1.0 requests with no headers. 183 | const char *prefix = "GET /metrics HTTP/1."; 184 | const int len = strlen(prefix); 185 | for (int i = 0; i < len; ++i) 186 | { 187 | int next = fgetc(fd); 188 | if (next == EOF || next != prefix[i]) // EOF or mismatch 189 | { 190 | return -1; 191 | } 192 | } 193 | return 0; 194 | } 195 | 196 | static int 197 | read_find_crlfcrlf(FILE* fd) 198 | { 199 | const char *substring = "\x0d\x0a\x0d\x0a"; 200 | const int len = strlen(substring); 201 | // automata is tivial as `substring` has no repeated chars 202 | for (int i = 0; i < len; ++i) 203 | { 204 | assert(i >= 0); 205 | int next = fgetc(fd); 206 | if (next == EOF) 207 | { 208 | return -1; 209 | } 210 | if (next != substring[i]) 211 | { 212 | if (next == substring[0]) 213 | { 214 | i = 0; 215 | } 216 | else 217 | { 218 | i = -1; 219 | } 220 | } 221 | } 222 | return 0; 223 | } 224 | 225 | static void* 226 | prometheus_thread(void *arg) 227 | { 228 | const int listen_fd = (ssize_t)arg; 229 | while (1) { 230 | const int client_fd = accept(listen_fd, NULL, NULL); 231 | const struct timeval maxdelay = { 5, 0 }; // 5 seconds, just like co2mon_read_data() 232 | struct co2mon_state copy; 233 | FILE* out = NULL; 234 | 235 | if (client_fd == -1) 236 | { 237 | perror("accept"); 238 | continue; 239 | } 240 | 241 | if (setsockopt(client_fd, SOL_SOCKET, SO_RCVTIMEO, &maxdelay, sizeof(maxdelay)) != 0 || 242 | setsockopt(client_fd, SOL_SOCKET, SO_SNDTIMEO, &maxdelay, sizeof(maxdelay)) != 0) 243 | { 244 | perror("setsockopt"); 245 | goto cleanup; 246 | } 247 | 248 | out = fdopen(client_fd, "a+b"); 249 | if (!out) 250 | { 251 | perror("fdopen"); 252 | goto cleanup; 253 | } 254 | 255 | if (read_match_path(out) != 0 || read_find_crlfcrlf(out) != 0) 256 | { 257 | fprintf(out, 258 | "HTTP/1.0 400 Bad Request\r\n" 259 | "Server: co2mond\r\n" 260 | "Connection: close\r\n" 261 | "\r\n" 262 | "goto /metrics;\r\n" 263 | ); 264 | goto flush; 265 | } 266 | 267 | state_lock(); 268 | memcpy(©, &co2mon, sizeof(copy)); 269 | state_unlock(); 270 | 271 | if (!bitarr_isset(copy.seen, CODE_TAMB) || !bitarr_isset(copy.seen, CODE_CNTR)) 272 | { 273 | fprintf(out, 274 | "HTTP/1.0 503 Service Unavailable\r\n" 275 | "Server: co2mond\r\n" 276 | "Connection: close\r\n" 277 | "\r\n" 278 | "Device not ready.\r\n" 279 | ); 280 | goto flush; 281 | } 282 | 283 | fprintf(out, 284 | "HTTP/1.0 200 OK\r\n" 285 | "Content-Type: text/plain; charset=utf-8\r\n" 286 | "Server: co2mond\r\n" 287 | "Connection: close\r\n" 288 | "\r\n" 289 | ); 290 | 291 | // Note, HTTP has \r\n and Prometheus uses \n as line separator. 292 | 293 | if (print_unknown) 294 | { 295 | int has_unknown = 0; 296 | for (int i = 0; i < sizeof(copy.data) / sizeof(copy.data[0]); ++i) 297 | { 298 | if (bitarr_isset(copy.seen, i) && i != CODE_TAMB && i != CODE_CNTR) 299 | { 300 | has_unknown = 1; 301 | break; 302 | } 303 | } 304 | if (has_unknown) 305 | { 306 | fprintf(out, 307 | "# HELP co2mon_unknown Unknown value.\n" 308 | "# TYPE co2mon_unknown gauge\n" 309 | ); 310 | for (int i = 0; i < sizeof(copy.data) / sizeof(copy.data[0]); ++i) 311 | { 312 | if (bitarr_isset(copy.seen, i) && i != CODE_TAMB && i != CODE_CNTR) 313 | { 314 | fprintf(out, "co2mon_unknown{key=\"x%02x\"} %d\n", i, copy.data[i]); 315 | } 316 | } 317 | } 318 | } 319 | fprintf(out, 320 | "# HELP co2mon_temp_celsius Ambient temperature.\n" 321 | "# TYPE co2mon_temp_celsius gauge\n" 322 | "co2mon_temp_celsius %.4f\n" 323 | "# HELP co2mon_co2_ppm Concentration of CO2, parts per million.\n" 324 | "# TYPE co2mon_co2_ppm gauge\n" 325 | "co2mon_co2_ppm %d\n" 326 | "# HELP co2mon_device_errors_total CO2 monitor device error counter.\n" 327 | "# TYPE co2mon_device_errors_total counter\n" 328 | "co2mon_device_errors_total %d\n" 329 | "# HELP co2mon_heartbeat_time_seconds CO2 monitor heartbeat timestamp.\n" 330 | "# TYPE co2mon_heartbeat_time_seconds gauge\n" 331 | "co2mon_heartbeat_time_seconds %lld\n", 332 | decode_temperature(copy.data[CODE_TAMB]), 333 | copy.data[CODE_CNTR], 334 | copy.deverr, 335 | (long long)copy.heatbeat 336 | ); 337 | flush: 338 | fflush(out); 339 | if (shutdown(client_fd, SHUT_WR) != 0) 340 | { 341 | perror("shutdown"); 342 | goto cleanup; 343 | } 344 | fgetc(out); // wait till EOF (or timeout) before calling close() 345 | cleanup: 346 | if (out) 347 | { 348 | fclose(out); 349 | } 350 | else 351 | { 352 | close(client_fd); 353 | } 354 | 355 | } 356 | } 357 | 358 | static void 359 | device_loop(co2mon_device dev) 360 | { 361 | co2mon_data_t magic_table = { 0 }; 362 | co2mon_data_t result; 363 | uint16_t written_tamb = 0; 364 | uint16_t written_cntr = 0; 365 | 366 | if (!co2mon_send_magic_table(dev, magic_table)) 367 | { 368 | state_lock(); 369 | co2mon.deverr++; 370 | state_unlock(); 371 | fprintf(stderr, "Unable to send magic table to CO2 device\n"); 372 | return; 373 | } 374 | 375 | state_lock(); 376 | memset(co2mon.seen, 0, sizeof(co2mon.seen)); 377 | state_unlock(); 378 | 379 | while (1) 380 | { 381 | int r = co2mon_read_data(dev, magic_table, result); 382 | if (r <= 0) 383 | { 384 | state_lock(); 385 | co2mon.deverr++; 386 | state_unlock(); 387 | fprintf(stderr, "Error while reading data from device\n"); 388 | break; 389 | } 390 | 391 | if (result[4] != 0x0d) 392 | { 393 | state_lock(); 394 | co2mon.deverr++; 395 | state_unlock(); 396 | fprintf(stderr, "Unexpected data from device (data[4] = %02hhx, want 0x0d)\n", result[4]); 397 | continue; 398 | } 399 | 400 | unsigned char r0, r1, r2, r3, checksum; 401 | r0 = result[0]; 402 | r1 = result[1]; 403 | r2 = result[2]; 404 | r3 = result[3]; 405 | checksum = r0 + r1 + r2; 406 | if (checksum != r3) 407 | { 408 | state_lock(); 409 | co2mon.deverr++; 410 | state_unlock(); 411 | fprintf(stderr, "checksum error (%02hhx, await %02hhx)\n", checksum, r3); 412 | continue; 413 | } 414 | 415 | char buf[VALUE_MAX]; 416 | uint16_t w = (result[1] << 8) + result[2]; 417 | 418 | switch (r0) 419 | { 420 | case CODE_TAMB: 421 | snprintf(buf, VALUE_MAX, "%.4f", decode_temperature(w)); 422 | 423 | if (!daemonize) 424 | { 425 | printf("Tamb\t%s\n", buf); 426 | fflush(stdout); 427 | } 428 | 429 | if (written_tamb != w) 430 | { 431 | if (write_value("Tamb", buf)) 432 | { 433 | written_tamb = w; 434 | } 435 | } 436 | 437 | write_heartbeat(); 438 | 439 | break; 440 | case CODE_CNTR: 441 | if ((unsigned)w > 3000) { 442 | // Avoid reading spurious (uninitialized?) data 443 | break; 444 | } 445 | snprintf(buf, VALUE_MAX, "%d", (int)w); 446 | 447 | if (!daemonize) 448 | { 449 | printf("CntR\t%s\n", buf); 450 | fflush(stdout); 451 | } 452 | 453 | if (written_cntr != w) 454 | { 455 | if (write_value("CntR", buf)) 456 | { 457 | written_cntr = w; 458 | } 459 | } 460 | 461 | write_heartbeat(); 462 | 463 | break; 464 | default: 465 | if (print_unknown && !daemonize) 466 | { 467 | printf("0x%02hhx\t%d\n", r0, (int)w); 468 | fflush(stdout); 469 | } 470 | } 471 | 472 | state_lock(); 473 | co2mon.data[r0] = w; 474 | bitarr_set(co2mon.seen, r0); 475 | state_unlock(); 476 | } 477 | } 478 | 479 | static co2mon_device 480 | open_device() 481 | { 482 | if (devicefile) 483 | { 484 | return co2mon_open_device_path(devicefile); 485 | } 486 | return co2mon_open_device(); 487 | } 488 | 489 | static void 490 | main_loop() 491 | { 492 | int error_shown = 0; 493 | while (1) 494 | { 495 | co2mon_device dev = open_device(); 496 | if (dev == NULL) 497 | { 498 | if (!error_shown) 499 | { 500 | fprintf(stderr, "Unable to open CO2 device\n"); 501 | error_shown = 1; 502 | } 503 | sleep(1); 504 | continue; 505 | } 506 | else 507 | { 508 | error_shown = 0; 509 | } 510 | 511 | device_loop(dev); 512 | 513 | co2mon_close_device(dev); 514 | } 515 | } 516 | 517 | int main(int argc, char *argv[]) 518 | { 519 | char *reldatadir = 0; 520 | char *promaddr = 0; 521 | char *pidfile = 0; 522 | char *logfile = 0; 523 | 524 | int c; 525 | int opterr = 0; 526 | int show_help = 0; 527 | while ((c = getopt(argc, argv, ":dnNhuD:P:f:l:p:")) != -1) 528 | { 529 | switch (c) 530 | { 531 | case 'd': 532 | daemonize = 1; 533 | break; 534 | case 'h': 535 | show_help = 1; 536 | break; 537 | case 'u': 538 | print_unknown = 1; 539 | break; 540 | case 'n': 541 | decode_data = 0; 542 | break; 543 | case 'N': 544 | decode_data = 1; 545 | break; 546 | case 'D': 547 | reldatadir = optarg; 548 | break; 549 | case 'P': 550 | promaddr = optarg; 551 | break; 552 | case 'f': 553 | devicefile = optarg; 554 | break; 555 | case 'l': 556 | logfile = optarg; 557 | break; 558 | case 'p': 559 | pidfile = optarg; 560 | break; 561 | case ':': 562 | fprintf(stderr, "Option -%c requires an operand\n", optopt); 563 | opterr++; 564 | break; 565 | case '?': 566 | fprintf(stderr, "Unrecognized option: -%c\n", optopt); 567 | opterr++; 568 | } 569 | } 570 | if (show_help || opterr || optind != argc) 571 | { 572 | fprintf(stderr, "usage: co2mond [-dhun] [-D datadir] [-f device] [-p pidfle] [-l logfile]\n"); 573 | if (show_help) 574 | { 575 | fprintf(stderr, "\n"); 576 | fprintf(stderr, " -d run as a daemon\n"); 577 | fprintf(stderr, " -h show this help message\n"); 578 | fprintf(stderr, " -u print values for unknown items\n"); 579 | fprintf(stderr, " -n use payload as-is, as delivered by 2nd release devices (overrides auto-detection)\n"); 580 | fprintf(stderr, " -N decode payload that is scrambled by 1st release devices (overrides auto-detection)\n"); 581 | fprintf(stderr, " -D datadir\n"); 582 | fprintf(stderr, " store values from the sensor in datadir\n"); 583 | fprintf(stderr, " -P host:port\n"); 584 | fprintf(stderr, " address on which to expose metrics\n"); 585 | fprintf(stderr, " -f devicefile\n"); 586 | #ifdef __linux__ 587 | fprintf(stderr, " path to a device (e.g., /dev/hidraw0)\n"); 588 | #else 589 | fprintf(stderr, " path to a device\n"); 590 | #endif 591 | fprintf(stderr, " -p pidfile\n"); 592 | fprintf(stderr, " write PID to a file named pidfile\n"); 593 | fprintf(stderr, " -l logfile\n"); 594 | fprintf(stderr, " write diagnostic information to a file named logfile\n"); 595 | fprintf(stderr, "\n"); 596 | } 597 | exit(1); 598 | } 599 | if (daemonize && !reldatadir && !promaddr) 600 | { 601 | fprintf(stderr, "co2mond: it is useless to use -d without -D or -P.\n"); 602 | exit(1); 603 | } 604 | 605 | if (reldatadir) 606 | { 607 | datadir = realpath(reldatadir, NULL); 608 | if (datadir == NULL) 609 | { 610 | perror(reldatadir); 611 | exit(1); 612 | } 613 | } 614 | 615 | int pidfd = -1; 616 | if (pidfile) 617 | { 618 | pidfd = open(pidfile, O_CREAT | O_WRONLY | O_TRUNC, 0666); 619 | if (pidfd == -1) 620 | { 621 | perror(pidfile); 622 | exit(1); 623 | } 624 | } 625 | 626 | int logfd = -1; 627 | if (logfile) 628 | { 629 | logfd = open(logfile, O_CREAT | O_WRONLY | O_APPEND, 0666); 630 | if (logfd == -1) 631 | { 632 | perror(logfile); 633 | exit(1); 634 | } 635 | } 636 | 637 | int listen_fd = -1; 638 | if (promaddr) 639 | { 640 | char *copy = strdup(promaddr); 641 | char *colon = strrchr(copy, ':'); 642 | char *port = colon ? colon + 1 : copy; 643 | if (colon) 644 | { 645 | *colon = '\0'; 646 | } 647 | char *host = 648 | (!colon || copy[0] == '\0') ? NULL : 649 | (copy[0] == '[') ? copy + 1 : 650 | copy; 651 | if (host) 652 | { 653 | size_t hlen = strlen(host); 654 | if (copy[0] == '[' && hlen > 0 && host[hlen - 1] == ']') 655 | { 656 | host[hlen - 1] = '\0'; 657 | } 658 | } 659 | 660 | struct addrinfo hints, *res; 661 | memset(&hints, 0, sizeof(hints)); 662 | hints.ai_family = AF_UNSPEC; 663 | hints.ai_socktype = SOCK_STREAM; 664 | hints.ai_flags = AI_NUMERICHOST | AI_PASSIVE | AI_NUMERICSERV; 665 | 666 | int gai_errno = getaddrinfo(host, port, &hints, &res); 667 | if (gai_errno != 0) 668 | { 669 | errx(EXIT_FAILURE, "getaddrinfo(%s): %s", promaddr, gai_strerror(gai_errno)); 670 | } 671 | 672 | listen_fd = socket(res->ai_family, res->ai_socktype, res->ai_protocol); 673 | if (listen_fd == -1) 674 | { 675 | err(EXIT_FAILURE, "socket"); 676 | } 677 | 678 | int on = 1; 679 | if (setsockopt(listen_fd, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on)) != 0) 680 | { 681 | err(EXIT_FAILURE, "setsockopt(SO_REUSEADDR)"); 682 | } 683 | 684 | if (bind(listen_fd, res->ai_addr, res->ai_addrlen) != 0) 685 | { 686 | err(EXIT_FAILURE, "bind"); 687 | } 688 | 689 | if (listen(listen_fd, 128) != 0) 690 | { 691 | err(EXIT_FAILURE, "listen"); 692 | } 693 | 694 | if (signal(SIGPIPE, SIG_IGN) != 0) 695 | { 696 | err(EXIT_FAILURE, "signal(SIGPIPE, SIG_IGN)"); 697 | } 698 | 699 | free(copy); 700 | freeaddrinfo(res); 701 | } 702 | 703 | if (daemonize) 704 | { 705 | if (daemon(0, 0) == -1) 706 | { 707 | perror("daemon"); 708 | exit(1); 709 | } 710 | } 711 | 712 | if (pidfd != -1) 713 | { 714 | char pid[VALUE_MAX]; 715 | snprintf(pid, VALUE_MAX, "%lld", (long long)getpid()); 716 | if (!write_data(pidfd, pid)) 717 | { 718 | exit(1); 719 | } 720 | } 721 | 722 | if (listen_fd != -1) 723 | { 724 | pthread_t tid; 725 | if (pthread_create(&tid, NULL, prometheus_thread, (void*)((size_t)listen_fd)) != 0) 726 | { 727 | err(EXIT_FAILURE, "pthread_create"); 728 | } 729 | 730 | if (pthread_detach(tid) != 0) 731 | { 732 | err(EXIT_FAILURE, "pthread_detach"); 733 | } 734 | } 735 | 736 | if (logfd != -1) 737 | { 738 | dup2(logfd, fileno(stderr)); 739 | close(logfd); 740 | } 741 | 742 | int r = co2mon_init(decode_data); 743 | if (r < 0) 744 | { 745 | return r; 746 | } 747 | 748 | main_loop(); 749 | 750 | co2mon_exit(); 751 | 752 | if (datadir) 753 | { 754 | free(datadir); 755 | } 756 | return 1; 757 | } 758 | -------------------------------------------------------------------------------- /LICENSE: -------------------------------------------------------------------------------- 1 | GNU GENERAL PUBLIC LICENSE 2 | Version 3, 29 June 2007 3 | 4 | Copyright (C) 2007 Free Software Foundation, Inc. 5 | Everyone is permitted to copy and distribute verbatim copies 6 | of this license document, but changing it is not allowed. 7 | 8 | Preamble 9 | 10 | The GNU General Public License is a free, copyleft license for 11 | software and other kinds of works. 12 | 13 | The licenses for most software and other practical works are designed 14 | to take away your freedom to share and change the works. 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No Surrender of Others' Freedom. 541 | 542 | If conditions are imposed on you (whether by court order, agreement or 543 | otherwise) that contradict the conditions of this License, they do not 544 | excuse you from the conditions of this License. If you cannot convey a 545 | covered work so as to satisfy simultaneously your obligations under this 546 | License and any other pertinent obligations, then as a consequence you may 547 | not convey it at all. For example, if you agree to terms that obligate you 548 | to collect a royalty for further conveying from those to whom you convey 549 | the Program, the only way you could satisfy both those terms and this 550 | License would be to refrain entirely from conveying the Program. 551 | 552 | 13. Use with the GNU Affero General Public License. 553 | 554 | Notwithstanding any other provision of this License, you have 555 | permission to link or combine any covered work with a work licensed 556 | under version 3 of the GNU Affero General Public License into a single 557 | combined work, and to convey the resulting work. The terms of this 558 | License will continue to apply to the part which is the covered work, 559 | but the special requirements of the GNU Affero General Public License, 560 | section 13, concerning interaction through a network will apply to the 561 | combination as such. 562 | 563 | 14. Revised Versions of this License. 564 | 565 | The Free Software Foundation may publish revised and/or new versions of 566 | the GNU General Public License from time to time. Such new versions will 567 | be similar in spirit to the present version, but may differ in detail to 568 | address new problems or concerns. 569 | 570 | Each version is given a distinguishing version number. If the 571 | Program specifies that a certain numbered version of the GNU General 572 | Public License "or any later version" applies to it, you have the 573 | option of following the terms and conditions either of that numbered 574 | version or of any later version published by the Free Software 575 | Foundation. If the Program does not specify a version number of the 576 | GNU General Public License, you may choose any version ever published 577 | by the Free Software Foundation. 578 | 579 | If the Program specifies that a proxy can decide which future 580 | versions of the GNU General Public License can be used, that proxy's 581 | public statement of acceptance of a version permanently authorizes you 582 | to choose that version for the Program. 583 | 584 | Later license versions may give you additional or different 585 | permissions. However, no additional obligations are imposed on any 586 | author or copyright holder as a result of your choosing to follow a 587 | later version. 588 | 589 | 15. Disclaimer of Warranty. 590 | 591 | THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY 592 | APPLICABLE LAW. EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT 593 | HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY 594 | OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, 595 | THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 596 | PURPOSE. THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE PROGRAM 597 | IS WITH YOU. SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF 598 | ALL NECESSARY SERVICING, REPAIR OR CORRECTION. 599 | 600 | 16. Limitation of Liability. 601 | 602 | IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING 603 | WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS 604 | THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY 605 | GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE 606 | USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF 607 | DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD 608 | PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS), 609 | EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF 610 | SUCH DAMAGES. 611 | 612 | 17. Interpretation of Sections 15 and 16. 613 | 614 | If the disclaimer of warranty and limitation of liability provided 615 | above cannot be given local legal effect according to their terms, 616 | reviewing courts shall apply local law that most closely approximates 617 | an absolute waiver of all civil liability in connection with the 618 | Program, unless a warranty or assumption of liability accompanies a 619 | copy of the Program in return for a fee. 620 | 621 | END OF TERMS AND CONDITIONS 622 | 623 | How to Apply These Terms to Your New Programs 624 | 625 | If you develop a new program, and you want it to be of the greatest 626 | possible use to the public, the best way to achieve this is to make it 627 | free software which everyone can redistribute and change under these terms. 628 | 629 | To do so, attach the following notices to the program. It is safest 630 | to attach them to the start of each source file to most effectively 631 | state the exclusion of warranty; and each file should have at least 632 | the "copyright" line and a pointer to where the full notice is found. 633 | 634 | 635 | Copyright (C) 636 | 637 | This program is free software: you can redistribute it and/or modify 638 | it under the terms of the GNU General Public License as published by 639 | the Free Software Foundation, either version 3 of the License, or 640 | (at your option) any later version. 641 | 642 | This program is distributed in the hope that it will be useful, 643 | but WITHOUT ANY WARRANTY; without even the implied warranty of 644 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 645 | GNU General Public License for more details. 646 | 647 | You should have received a copy of the GNU General Public License 648 | along with this program. If not, see . 649 | 650 | Also add information on how to contact you by electronic and paper mail. 651 | 652 | If the program does terminal interaction, make it output a short 653 | notice like this when it starts in an interactive mode: 654 | 655 | Copyright (C) 656 | This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'. 657 | This is free software, and you are welcome to redistribute it 658 | under certain conditions; type `show c' for details. 659 | 660 | The hypothetical commands `show w' and `show c' should show the appropriate 661 | parts of the General Public License. Of course, your program's commands 662 | might be different; for a GUI interface, you would use an "about box". 663 | 664 | You should also get your employer (if you work as a programmer) or school, 665 | if any, to sign a "copyright disclaimer" for the program, if necessary. 666 | For more information on this, and how to apply and follow the GNU GPL, see 667 | . 668 | 669 | The GNU General Public License does not permit incorporating your program 670 | into proprietary programs. If your program is a subroutine library, you 671 | may consider it more useful to permit linking proprietary applications with 672 | the library. If this is what you want to do, use the GNU Lesser General 673 | Public License instead of this License. But first, please read 674 | . 675 | --------------------------------------------------------------------------------