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#include <map>
#include <cstdio>
#include <string>
#include <vector>
#include <cstdlib>
#include <algorithm>
#include <stdexcept>
extern "C" {
#include <fcntl.h>
#include <unistd.h>
}
#include <yaml-cpp/yaml.h>
#include <libevdev/libevdev-uinput.h>
std::map<int, std::string> bus_string = {
#ifdef BUS_PCI
{BUS_PCI, "BUS_PCI"},
#endif
#ifdef BUS_ISAPNP
{BUS_ISAPNP, "BUS_ISAPNP"},
#endif
#ifdef BUS_USB
{BUS_USB, "BUS_USB"},
#endif
#ifdef BUS_HIL
{BUS_HIL, "BUS_HIL"},
#endif
#ifdef BUS_BLUETOOTH
{BUS_BLUETOOTH, "BUS_BLUETOOTH"},
#endif
#ifdef BUS_VIRTUAL
{BUS_VIRTUAL, "BUS_VIRTUAL"},
#endif
#ifdef BUS_ISA
{BUS_ISA, "BUS_ISA"},
#endif
#ifdef BUS_I8042
{BUS_I8042, "BUS_I8042"},
#endif
#ifdef BUS_XTKBD
{BUS_XTKBD, "BUS_XTKBD"},
#endif
#ifdef BUS_RS232
{BUS_RS232, "BUS_RS232"},
#endif
#ifdef BUS_GAMEPORT
{BUS_GAMEPORT, "BUS_GAMEPORT"},
#endif
#ifdef BUS_PARPORT
{BUS_PARPORT, "BUS_PARPORT"},
#endif
#ifdef BUS_AMIGA
{BUS_AMIGA, "BUS_AMIGA"},
#endif
#ifdef BUS_ADB
{BUS_ADB, "BUS_ADB"},
#endif
#ifdef BUS_I2C
{BUS_I2C, "BUS_I2C"},
#endif
#ifdef BUS_HOST
{BUS_HOST, "BUS_HOST"},
#endif
#ifdef BUS_GSC
{BUS_GSC, "BUS_GSC"},
#endif
#ifdef BUS_ATARI
{BUS_ATARI, "BUS_ATARI"},
#endif
#ifdef BUS_SPI
{BUS_SPI, "BUS_SPI"},
#endif
#ifdef BUS_RMI
{BUS_RMI, "BUS_RMI"},
#endif
#ifdef BUS_CEC
{BUS_CEC, "BUS_CEC"},
#endif
#ifdef BUS_INTEL_ISHTP
{BUS_INTEL_ISHTP, "BUS_INTEL_ISHTP"},
#endif
};
std::map<std::string, int> string_bus = {
#ifdef BUS_PCI
{"BUS_PCI", BUS_PCI},
#endif
#ifdef BUS_ISAPNP
{"BUS_ISAPNP", BUS_ISAPNP},
#endif
#ifdef BUS_USB
{"BUS_USB", BUS_USB},
#endif
#ifdef BUS_HIL
{"BUS_HIL", BUS_HIL},
#endif
#ifdef BUS_BLUETOOTH
{"BUS_BLUETOOTH", BUS_BLUETOOTH},
#endif
#ifdef BUS_VIRTUAL
{"BUS_VIRTUAL", BUS_VIRTUAL},
#endif
#ifdef BUS_ISA
{"BUS_ISA", BUS_ISA},
#endif
#ifdef BUS_I8042
{"BUS_I8042", BUS_I8042},
#endif
#ifdef BUS_XTKBD
{"BUS_XTKBD", BUS_XTKBD},
#endif
#ifdef BUS_RS232
{"BUS_RS232", BUS_RS232},
#endif
#ifdef BUS_GAMEPORT
{"BUS_GAMEPORT", BUS_GAMEPORT},
#endif
#ifdef BUS_PARPORT
{"BUS_PARPORT", BUS_PARPORT},
#endif
#ifdef BUS_AMIGA
{"BUS_AMIGA", BUS_AMIGA},
#endif
#ifdef BUS_ADB
{"BUS_ADB", BUS_ADB},
#endif
#ifdef BUS_I2C
{"BUS_I2C", BUS_I2C},
#endif
#ifdef BUS_HOST
{"BUS_HOST", BUS_HOST},
#endif
#ifdef BUS_GSC
{"BUS_GSC", BUS_GSC},
#endif
#ifdef BUS_ATARI
{"BUS_ATARI", BUS_ATARI},
#endif
#ifdef BUS_SPI
{"BUS_SPI", BUS_SPI},
#endif
#ifdef BUS_RMI
{"BUS_RMI", BUS_RMI},
#endif
#ifdef BUS_CEC
{"BUS_CEC", BUS_CEC},
#endif
#ifdef BUS_INTEL_ISHTP
{"BUS_INTEL_ISHTP", BUS_INTEL_ISHTP},
#endif
};
void print_usage(std::FILE *stream, const char *program) {
// clang-format off
std::fprintf(stream,
"uinput - redirect device input events from stdin to virtual device\n"
"\n"
"usage: %s [-h | [-p] [-c device.yaml] [-d devnode]]\n"
"\n"
"options:\n"
" -h show this message and exit\n"
" -p show resulting YAML device description merge and exit\n"
" -c device.yaml merge YAML device description to resulting virtual\n"
" device (repeatable)\n"
" -d devnode merge reference device description to resulting virtual\n"
" device (repeatable)\n",
program);
// clang-format on
}
bool is_int(const std::string &s) {
return s.find_first_not_of("0123456789") == std::string::npos;
}
using block_type = unsigned long;
constexpr int block_size = sizeof(block_type) * 8;
constexpr int blocks_needed(int n_bits) {
return (n_bits - 1) / block_size + 1;
}
bool bit(const block_type buffer[], int bit_index) {
return buffer[bit_index / block_size] &
(block_type{1} << (bit_index % block_size));
}
std::string yaml_create_from_evdev(libevdev *dev) {
using std::map;
using std::vector;
using std::string;
using std::any_of;
YAML::Emitter yaml;
yaml << YAML::BeginMap;
if (auto name = libevdev_get_name(dev))
yaml << YAML::Key << "NAME" << YAML::Value << name;
if (auto location = libevdev_get_phys(dev))
yaml << YAML::Key << "LOCATION" << YAML::Value << location;
if (auto id = libevdev_get_uniq(dev))
yaml << YAML::Key << "ID" << YAML::Value << id;
if (auto product = libevdev_get_id_product(dev))
yaml << YAML::Key << "PRODUCT" << YAML::Value << product;
if (auto vendor = libevdev_get_id_vendor(dev))
yaml << YAML::Key << "VENDOR" << YAML::Value << vendor;
if (auto bustype = libevdev_get_id_bustype(dev)) {
if (bus_string.find(bustype) != bus_string.end())
yaml << YAML::Key << "BUSTYPE" << YAML::Value
<< bus_string[bustype];
else
yaml << YAML::Key << "BUSTYPE" << YAML::Value << bustype;
}
if (auto driver_version = libevdev_get_driver_version(dev))
yaml << YAML::Key << "DRIVER_VERSION" << YAML::Value << driver_version;
vector<string> properties;
if (libevdev_has_property(dev, INPUT_PROP_POINTER))
properties.push_back("INPUT_PROP_POINTER");
if (libevdev_has_property(dev, INPUT_PROP_DIRECT))
properties.push_back("INPUT_PROP_DIRECT");
if (libevdev_has_property(dev, INPUT_PROP_BUTTONPAD))
properties.push_back("INPUT_PROP_BUTTONPAD");
if (libevdev_has_property(dev, INPUT_PROP_SEMI_MT))
properties.push_back("INPUT_PROP_SEMI_MT");
if (libevdev_has_property(dev, INPUT_PROP_TOPBUTTONPAD))
properties.push_back("INPUT_PROP_TOPBUTTONPAD");
if (libevdev_has_property(dev, INPUT_PROP_POINTING_STICK))
properties.push_back("INPUT_PROP_POINTING_STICK");
if (libevdev_has_property(dev, INPUT_PROP_ACCELEROMETER))
properties.push_back("INPUT_PROP_ACCELEROMETER");
if (!properties.empty())
yaml << YAML::Key << "PROPERTIES" << YAML::Value << properties;
int fd = libevdev_get_fd(dev);
block_type type_mask[blocks_needed(EV_MAX)] = {};
block_type event_mask[blocks_needed(KEY_MAX)] = {};
if (ioctl(fd, EVIOCGBIT(0, EV_MAX), type_mask) != -1 &&
any_of(type_mask, type_mask + blocks_needed(EV_MAX),
[](block_type block) { return block != block_type{}; })) {
yaml << YAML::Key << "EVENTS" << YAML::Value;
yaml << YAML::BeginMap;
for (int type_code = 0; type_code <= EV_MAX; ++type_code) {
if (!bit(type_mask, type_code))
continue;
int event_max = libevdev_event_type_get_max(type_code);
const char *type_name = libevdev_event_type_get_name(type_code);
yaml << YAML::Key;
if (type_name)
yaml << libevdev_event_type_get_name(type_code);
else
yaml << type_code;
yaml << YAML::Value;
switch (type_code) {
case EV_SYN:
yaml << YAML::Flow << YAML::BeginSeq;
if (libevdev_has_event_code(dev, EV_SYN, SYN_REPORT))
yaml << "SYN_REPORT";
if (libevdev_has_event_code(dev, EV_SYN, SYN_CONFIG))
yaml << "SYN_CONFIG";
if (libevdev_has_event_code(dev, EV_SYN, SYN_MT_REPORT))
yaml << "SYN_MT_REPORT";
if (libevdev_has_event_code(dev, EV_SYN, SYN_DROPPED))
yaml << "SYN_DROPPED";
yaml << YAML::EndSeq;
break;
case EV_REP: {
int delay, period;
libevdev_get_repeat(dev, &delay, &period);
yaml << YAML::BeginMap;
yaml << YAML::Key << "REP_DELAY" << YAML::Value << delay;
yaml << YAML::Key << "REP_PERIOD" << YAML::Value << period;
yaml << YAML::EndMap;
} break;
case EV_ABS:
if (ioctl(fd, EVIOCGBIT(type_code, event_max),
event_mask) != -1) {
yaml << YAML::BeginMap;
for (int event_code = 0; event_code <= event_max;
++event_code) {
if (!bit(event_mask, event_code))
continue;
if (auto absinfo =
libevdev_get_abs_info(dev, event_code)) {
if (auto event_name =
libevdev_event_code_get_name(
type_code, event_code))
yaml << YAML::Key << event_name
<< YAML::Value;
else
yaml << YAML::Key << event_code
<< YAML::Value;
yaml << YAML::BeginMap;
yaml << YAML::Key << "VALUE" << YAML::Value
<< absinfo->value;
yaml << YAML::Key << "MIN" << YAML::Value
<< absinfo->minimum;
yaml << YAML::Key << "MAX" << YAML::Value
<< absinfo->maximum;
if (absinfo->flat > 0)
yaml << YAML::Key << "FLAT" << YAML::Value
<< absinfo->flat;
if (absinfo->fuzz > 0)
yaml << YAML::Key << "FUZZ" << YAML::Value
<< absinfo->fuzz;
if (absinfo->resolution > 0)
yaml << YAML::Key << "RES" << YAML::Value
<< absinfo->resolution;
yaml << YAML::EndMap;
}
}
yaml << YAML::EndMap;
}
break;
default:
if (ioctl(fd, EVIOCGBIT(type_code, event_max),
event_mask) != -1) {
yaml << YAML::Flow << YAML::BeginSeq;
for (int event_code = 0; event_code <= event_max;
++event_code) {
if (!bit(event_mask, event_code))
continue;
if (auto event_name = libevdev_event_code_get_name(
type_code, event_code))
yaml << event_name;
else
yaml << event_code;
}
yaml << YAML::EndSeq;
}
break;
}
}
yaml << YAML::EndMap;
}
yaml << YAML::EndMap;
return yaml.c_str();
}
libevdev *evdev_create_from_yaml(const std::vector<YAML::Node> &configs) {
using std::map;
using std::stoi;
using std::vector;
using std::string;
libevdev *dev = libevdev_new();
for (const auto &config : configs) {
if (auto name = config["NAME"])
libevdev_set_name(dev, name.as<string>().c_str());
if (auto id = config["ID"])
libevdev_set_uniq(dev, id.as<string>().c_str());
if (auto product = config["PRODUCT"])
libevdev_set_id_product(dev, product.as<int>());
if (auto vendor = config["VENDOR"])
libevdev_set_id_vendor(dev, vendor.as<int>());
if (auto bustype = config["BUSTYPE"])
libevdev_set_id_bustype(dev, string_bus[bustype.as<string>()]);
if (auto version = config["VERSION"])
libevdev_set_id_version(dev, version.as<int>());
if (auto property = config["PROPERTIES"])
for (auto it = property.begin(); it != property.end(); ++it) {
auto property =
libevdev_property_from_name(it->as<string>().c_str());
if (property != -1)
libevdev_enable_property(dev, property);
}
if (auto event_types = config["EVENTS"]) {
for (const auto &event_type : event_types) {
auto event_type_string = event_type.first.as<string>();
if (event_type_string == "EV_REP") {
if (auto rep_delay = event_type.second["REP_DELAY"]) {
auto rep_delay_value = rep_delay.as<int>();
libevdev_enable_event_code(dev, EV_REP, REP_DELAY,
&rep_delay_value);
}
if (auto rep_period = event_type.second["REP_PERIOD"]) {
auto rep_period_value = rep_period.as<int>();
libevdev_enable_event_code(dev, EV_REP, REP_PERIOD,
&rep_period_value);
}
} else if (event_type_string == "EV_ABS") {
for (const auto &axis : event_type.second) {
input_absinfo absinfo = {};
if (auto axis_value = axis.second["VALUE"])
absinfo.value = axis_value.as<int>();
if (auto axis_min = axis.second["MIN"])
absinfo.minimum = axis_min.as<int>();
if (auto axis_max = axis.second["MAX"])
absinfo.maximum = axis_max.as<int>();
if (auto axis_flat = axis.second["FLAT"])
absinfo.flat = axis_flat.as<int>();
if (auto fuzz = axis.second["FUZZ"])
absinfo.fuzz = fuzz.as<int>();
if (auto res = axis.second["RES"])
absinfo.resolution = res.as<int>();
if (!axis.second["VALUE"] && axis.second["MAX"])
absinfo.value = absinfo.maximum;
if (!axis.second["VALUE"] && axis.second["MIN"])
absinfo.value = absinfo.minimum;
auto axis_code = libevdev_event_code_from_name(
EV_ABS, axis.first.as<string>().c_str());
if (axis_code != -1)
libevdev_enable_event_code(dev, EV_ABS, axis_code,
&absinfo);
}
} else {
auto event_type_code = libevdev_event_type_from_name(
event_type_string.c_str());
for (const auto &event : event_type.second) {
auto event_string = event.as<string>();
if (is_int(event_string))
libevdev_enable_event_code(dev, event_type_code,
stoi(event_string),
nullptr);
else {
auto event_code = libevdev_event_code_from_name(
event_type_code, event_string.c_str());
if (event_code != -1)
libevdev_enable_event_code(dev, event_type_code,
event_code, nullptr);
}
}
}
}
}
}
return dev;
}
int main(int argc, char *argv[]) try {
using std::perror;
std::vector<YAML::Node> configs;
bool print = false;
for (int opt; (opt = getopt(argc, argv, "hc:d:p")) != -1;) {
switch (opt) {
case 'h':
return print_usage(stdout, argv[0]), EXIT_SUCCESS;
case 'c':
configs.push_back(YAML::LoadFile(optarg));
continue;
case 'd': {
int fd = open(optarg, O_RDONLY);
if (fd < 0)
return perror("open failed"), EXIT_FAILURE;
struct defer1 {
int fd;
~defer1() { close(fd); }
} defer1{fd};
libevdev *dev;
if (libevdev_new_from_fd(fd, &dev) < 0)
return perror("libevdev_new_from_fd failed"), EXIT_FAILURE;
struct defer2 {
libevdev *dev;
~defer2() { libevdev_free(dev); }
} defer2{dev};
configs.push_back(YAML::Load(yaml_create_from_evdev(dev)));
continue;
}
case 'p':
if (print)
break;
print = true;
continue;
}
return print_usage(stderr, argv[0]), EXIT_FAILURE;
}
if (configs.empty())
return print_usage(stderr, argv[0]), EXIT_FAILURE;
libevdev *dev = evdev_create_from_yaml(configs);
struct defer1 {
libevdev *dev;
~defer1() { libevdev_free(dev); }
} defer1{dev};
libevdev_uinput *uidev;
if (libevdev_uinput_create_from_device(dev, LIBEVDEV_UINPUT_OPEN_MANAGED,
&uidev) < 0)
return perror("libevdev_uinput_create_from_device failed"),
EXIT_FAILURE;
struct defer2 {
libevdev_uinput *uidev;
~defer2() { libevdev_uinput_destroy(uidev); }
} defer2{uidev};
if (print) {
int fd = open(libevdev_uinput_get_devnode(uidev), O_RDONLY);
if (fd < 0)
return perror("open failed"), EXIT_FAILURE;
struct defer1 {
int fd;
~defer1() { close(fd); }
} defer1{fd};
libevdev *dev;
if (libevdev_new_from_fd(fd, &dev) < 0)
return perror("libevdev_new_from_fd failed"), EXIT_FAILURE;
struct defer2 {
libevdev *dev;
~defer2() { libevdev_free(dev); }
} defer2{dev};
return puts(yaml_create_from_evdev(dev).c_str()), EXIT_SUCCESS;
}
std::setbuf(stdin, nullptr);
input_event input;
while (fread(&input, sizeof input, 1, stdin) == 1)
if (libevdev_uinput_write_event(uidev, input.type, input.code,
input.value) < 0)
return perror("libevdev_uinput_write_event failed"), EXIT_FAILURE;
} catch (const std::exception &e) {
return std::fprintf(stderr,
R"(an exception occurred: "%s")"
"\n",
e.what()),
EXIT_FAILURE;
}
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