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hidclient.c
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/*
* hidclient - A Bluetooth HID client device emulation
*
* A bluetooth/bluez software emulating a bluetooth mouse/keyboard
* combination device - use it to transmit mouse movements and
* keyboard keystrokes from a Linux box to any other BTHID enabled
* computer or compatible machine
*
*
* Implementation
* 2004-2006 by Anselm Martin Hoffmeister
* <stockholm(at)users(period)sourceforge(period)net>
* 2004/2005 Implementation for the GPLed Nokia-supported Affix Bluetooth
* stack as a practical work at
* Rheinische Friedrich-Wilhelms-UniversitÀt, Bonn, Germany
* 2006 Software ported to Bluez, several code cleanups
* 2006-07-25 First public release
*
* Updates
* 2012-02-10 by Peter G
* Updated to work with current distro (Lubuntu 11.10)
* EDIT FILE /etc/bluetooth/main.conf
* to include:
* DisablePlugins = network,input,hal,pnat
* AMH: Just disable input might be good enough.
* recomended to change:
* Class = 0x000540
* AMH: This leads to the device being found as "Keyboard".
* Some devices might ignore non-0x540 input devices
* before starting, also execute the following commands
* hciconfig hci0 class 0x000540
* # AMH: Should be optional if Class= set (above)
* hciconfig hci0 name \'Bluetooth Keyboard\'
* # AMH: Optional: Name will be seen by other BTs
* hciconfig hci0 sspmode 0
* # AMH: Optional: Disables simple pairing mode
* sdptool del 0x10000
* sdptool del 0x10001
* sdptool del 0x10002
* sdptool del 0x10003
* sdptool del 0x10004
* sdptool del 0x10005
* sdptool del 0x10006
* sdptool del 0x10007
* sdptool del 0x10008
* # This removes any non-HID SDP entries.
* # Might help if other devices only like
* # single-function Bluetooth devices
* # Not strictly required though.
* 2012-07-26 Several small updates necessary to work on
* Ubuntu 12.04 LTS on amd64
* Added -e, -l, -x
* 2012-07-28 Add support for FIFO operation (-f/filename)
*
* Dependency: Needs libbluetooth (from bluez)
*
* Usage: hidclient [-h|-?|--help] [-s|--skipsdp]
* Start hidclient. -h will display usage information.
* -e<NUM> asks hidclient to ONLY use Input device #NUM
* -f<FILENAME> will not read event devices, but create a
* fifo on <FILENAME> and read input_event data blocks
* from there
* -l will list input devices available
* -x will try to remove the "grabbed" input devices from
* the local X11 server, if possible
* -s will disable SDP registration (which only makes sense
* when debugging as most counterparts require SDP to work)
* Tip: Use "openvt" along with hidclient so that keystrokes and
* mouse events captured will have no negative impact on the
* local machine (except Ctrl+Alt+[Fn/Entf/Pause]).
* Run
* openvt -s -w hidclient
* to run hidclient on a virtual text mode console for itself.
* Alternative: Use "hidclient" in a X11 session after giving the active
* user read permissions on the /dev/input/event<NUM> devices
* you intend to use. With the help of -x (and possibly -e<NUM>)
* this should simply disattach input devices from the local
* machine while hidclient is running (and hopefully, reattach
* them afterwards, of course).
*
* License:
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation;
* strictly version 2 only.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public
* License along with this program; if not, write to the
* Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
* Boston, MA 02110-1301 USA
*/
//***************** Include files
#include <errno.h>
#include <fcntl.h>
#include <stdio.h>
#include <signal.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <termios.h>
#include <ctype.h>
#include <sys/stat.h>
#include <sys/time.h>
#include <sys/types.h>
#include <sys/select.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <linux/input.h>
#include <bluetooth/bluetooth.h>
#include <bluetooth/hci.h>
#include <bluetooth/hci_lib.h>
#include <bluetooth/l2cap.h>
#include <bluetooth/sdp.h>
#include <bluetooth/sdp_lib.h>
#include <getopt.h>
#include <assert.h>
#include <asciimap.h>
//***************** Static definitions
// Where to find event devices (that must be readable by current user)
// "%d" to be filled in, opening several devices, see below
#define EVDEVNAME "/dev/input/event%d"
#define TTYNAME "/dev/tty"
// Maximally, read MAXEVDEVS event devices simultaneously
#define MAXEVDEVS 64
// slot in the evdevs table we use when taking input from a TTY
#define TTY_FD_IDX 0
// Bluetooth "ports" (PSMs) for HID usage, standardized to be 17 and 19 resp.
// In theory you could use different ports, but several implementations seem
// to ignore the port info in the SDP records and always use 17 and 19. YMMV.
#define PSMHIDCTL 0x11
#define PSMHIDINT 0x13
// Information to be submitted to the SDP server, as service description
#define HIDINFO_NAME "Bluez virtual Mouse and Keyboard"
#define HIDINFO_PROV "Anselm Martin Hoffmeister (GPL v2)"
#define HIDINFO_DESC "Keyboard"
// These numbers must also be used in the HID descriptor binary file
#define REPORTID_MOUSE 1
#define REPORTID_KEYBD 2
// Fixed SDP record, corresponding to data structures below. Explanation
// is in separate text file. No reason to change this if you do not want
// to fiddle with the data sent over the BT connection as well.
#define SDPRECORD "\x05\x01\x09\x02\xA1\x01\x85\x01\x09\x01\xA1\x00" \
"\x05\x09\x19\x01\x29\x03\x15\x00\x25\x01\x75\x01" \
"\x95\x03\x81\x02\x75\x05\x95\x01\x81\x01\x05\x01" \
"\x09\x30\x09\x31\x09\x38\x15\x81\x25\x7F\x75\x08" \
"\x95\x02\x81\x06\xC0\xC0\x05\x01\x09\x06\xA1\x01" \
"\x85\x02\xA1\x00\x05\x07\x19\xE0\x29\xE7\x15\x00" \
"\x25\x01\x75\x01\x95\x08\x81\x02\x95\x08\x75\x08" \
"\x15\x00\x25\x65\x05\x07\x19\x00\x29\x65\x81\x00" \
"\xC0\xC0"
#define SDPRECORD_BYTES 98
#define MOD_L_CTRL (1<<0)
#define MOD_L_SHFT (1<<1)
#define MOD_L_ALT (1<<2)
#define MOD_L_CMD (1<<3)
#define MOD_R_CTRL (1<<4)
#define MOD_R_SHFT (1<<5)
#define MOD_R_ALT (1<<6)
#define MOD_R_CMD (1<<7)
//***************** Function prototypes
int dosdpregistration(void);
void sdpunregister(unsigned int);
static void add_lang_attr(sdp_record_t *r);
int btbind(int sockfd, unsigned short port);
int initevents(unsigned int,int);
int inittty(const char *);
void closeevents(void);
void closetty(void);
int initfifo(char *);
void closefifo(void);
void cleanup_stdin(void);
int add_filedescriptors(fd_set*);
int parse_events(fd_set*,int);
int parse_tty(fd_set*, int);
void showhelp(void);
void onsignal(int);
//***************** Data structures
// Mouse HID report, as sent over the wire:
struct hidrep_mouse_t
{
unsigned char btcode; // Fixed value for "Data Frame": 0xA1
unsigned char rep_id; // Will be set to REPORTID_MOUSE for "mouse"
unsigned char button; // bits 0..2 for left,right,middle, others 0
signed char axis_x; // relative movement in pixels, left/right
signed char axis_y; // dito, up/down
signed char axis_z; // Used for the scroll wheel (?)
} __attribute((packed));
// Keyboard HID report, as sent over the wire:
struct hidrep_keyb_t
{
unsigned char btcode; // Fixed value for "Data Frame": 0xA1
unsigned char rep_id; // Will be set to REPORTID_KEYBD for "keyboard"
unsigned char modify; // Modifier keys (shift, alt, the like)
unsigned char key[8]; // Currently pressed keys, max 8 at once
} __attribute((packed));
//***************** Global variables
char prepareshutdown = 0; // Set if shutdown was requested
struct termios origttysettings;
int eventdevs[MAXEVDEVS]; // file descriptors
int x11handles[MAXEVDEVS];
char mousebuttons = 0; // storage for button status
char modifierkeys = 0; // and for shift/ctrl/alt... status
char pressedkey[8] = { 0, 0, 0, 0, 0, 0, 0, 0 };
char connectionok = 0;
uint32_t sdphandle = 0; // To be used to "unregister" on exit
int debugevents = 0; // bitmask for debugging event data
//***************** Implementation
/*
* Taken from bluetooth library because of suspicious memory allocation
* THIS IS A HACK that appears to work, and did not need to look into how it works
* SHOULD BE FIXED AND FIX BACKPORTED TO BLUEZ
*/
sdp_data_t *sdp_seq_alloc_with_length(void **dtds, void **values, int *length,
int len)
{
sdp_data_t *curr = NULL, *seq = NULL;
int i;
int totall = 1024;
for (i = 0; i < len; i++) {
sdp_data_t *data;
int8_t dtd = *(uint8_t *) dtds[i];
if (dtd >= SDP_SEQ8 && dtd <= SDP_ALT32) {
data = (sdp_data_t *) values[i]; }
else {
data = sdp_data_alloc_with_length(dtd, values[i], length[i]); }
if (!data)
return NULL;
if (curr)
curr->next = data;
else
seq = data;
curr = data;
totall += length[i] + sizeof *seq; /* no idea what this should really be */
}
/*
* Here we had a reference here to a non-existing array member. Changed it something that
* appears to be large enough BUT author has no idea what it really should be
*/
// fprintf ( stderr, "length[%d]): %d, totall: %d\n", i, length[i], totall);
return sdp_data_alloc_with_length(SDP_SEQ8, seq, totall);
}
/*
* dosdpregistration - Care for the proper SDP record sent to the "sdpd"
* so that other BT devices can discover the HID service
* Parameters: none; Return value: 0 = OK, >0 = failure
*/
int dosdpregistration ( void )
{
sdp_record_t record;
sdp_session_t *session;
sdp_list_t *svclass_id,
*pfseq,
*apseq,
*root;
uuid_t root_uuid,
hidkb_uuid,
l2cap_uuid,
hidp_uuid;
sdp_profile_desc_t profile[1];
sdp_list_t *aproto,
*proto[3];
sdp_data_t *psm,
*lang_lst,
*lang_lst2,
*hid_spec_lst,
*hid_spec_lst2;
void *dtds[2],
*values[2],
*dtds2[2],
*values2[2];
int i,
leng[2];
uint8_t dtd=SDP_UINT16,
dtd2=SDP_UINT8,
dtd_data=SDP_TEXT_STR8,
hid_spec_type=0x22;
uint16_t hid_attr_lang[]={0x409, 0x100},
ctrl=PSMHIDCTL,
intr=PSMHIDINT,
hid_attr[]={0x100, 0x111, 0x40, 0x00, 0x01, 0x01},
// Assigned to SDP 0x200...0x205 - see HID SPEC for
// details. Those values seem to work fine...
// "it\'s a kind of magic" numbers.
hid_attr2[]={0x100, 0x0};
// Connect to SDP server on localhost, to publish service information
session = sdp_connect ( BDADDR_ANY, BDADDR_LOCAL, 0 );
if ( ! session )
{
fprintf ( stderr, "Failed to connect to SDP server: %s\n",
strerror ( errno ) );
return 1;
}
memset(&record, 0, sizeof(sdp_record_t));
record.handle = 0xffffffff;
// With 0xffffffff, we get assigned the first free record >= 0x10000
// Make HID service visible (add to PUBLIC BROWSE GROUP)
sdp_uuid16_create(&root_uuid, PUBLIC_BROWSE_GROUP);
root = sdp_list_append(0, &root_uuid);
sdp_set_browse_groups(&record, root);
// Language Information to be added
add_lang_attr(&record);
// The descriptor for the keyboard
sdp_uuid16_create(&hidkb_uuid, HID_SVCLASS_ID);
svclass_id = sdp_list_append(0, &hidkb_uuid);
sdp_set_service_classes(&record, svclass_id);
// And information about the HID profile used
sdp_uuid16_create(&profile[0].uuid, HID_PROFILE_ID);
profile[0].version = 0x0100;
pfseq = sdp_list_append(0, profile);
sdp_set_profile_descs(&record, pfseq);
// We are using L2CAP, so add an info about that
sdp_uuid16_create(&l2cap_uuid, L2CAP_UUID);
proto[1] = sdp_list_append(0, &l2cap_uuid);
psm = sdp_data_alloc(SDP_UINT16, &ctrl);
proto[1] = sdp_list_append(proto[1], psm);
apseq = sdp_list_append(0, proto[1]);
// And about our purpose, the HID protocol data transfer
sdp_uuid16_create(&hidp_uuid, HIDP_UUID);
proto[2] = sdp_list_append(0, &hidp_uuid);
apseq = sdp_list_append(apseq, proto[2]);
aproto = sdp_list_append(0, apseq);
sdp_set_access_protos(&record, aproto);
proto[1] = sdp_list_append(0, &l2cap_uuid);
psm = sdp_data_alloc(SDP_UINT16, &intr);
proto[1] = sdp_list_append(proto[1], psm);
apseq = sdp_list_append(0, proto[1]);
sdp_uuid16_create(&hidp_uuid, HIDP_UUID);
proto[2] = sdp_list_append(0, &hidp_uuid);
apseq = sdp_list_append(apseq, proto[2]);
aproto = sdp_list_append(0, apseq);
sdp_set_add_access_protos(&record, aproto);
// Set service name, description
sdp_set_info_attr(&record, HIDINFO_NAME, HIDINFO_PROV, HIDINFO_DESC);
// Add a few HID-specifid pieces of information
// See the HID spec for details what those codes 0x200+something
// are good for... we send a fixed set of info that seems to work
sdp_attr_add_new(&record, SDP_ATTR_HID_DEVICE_RELEASE_NUMBER,
SDP_UINT16, &hid_attr[0]); /* Opt */
sdp_attr_add_new(&record, SDP_ATTR_HID_PARSER_VERSION,
SDP_UINT16, &hid_attr[1]); /* Mand */
sdp_attr_add_new(&record, SDP_ATTR_HID_DEVICE_SUBCLASS,
SDP_UINT8, &hid_attr[2]); /* Mand */
sdp_attr_add_new(&record, SDP_ATTR_HID_COUNTRY_CODE,
SDP_UINT8, &hid_attr[3]); /* Mand */
sdp_attr_add_new(&record, SDP_ATTR_HID_VIRTUAL_CABLE,
SDP_BOOL, &hid_attr[4]); /* Mand */
sdp_attr_add_new(&record, SDP_ATTR_HID_RECONNECT_INITIATE,
SDP_BOOL, &hid_attr[5]); /* Mand */
// Add the HID descriptor (describing the virtual device) as code
// SDP_ATTR_HID_DESCRIPTOR_LIST (0x206 IIRC)
dtds[0] = &dtd2;
values[0] = &hid_spec_type;
dtd_data= SDPRECORD_BYTES <= 255 ? SDP_TEXT_STR8 : SDP_TEXT_STR16 ;
dtds[1] = &dtd_data;
values[1] = (uint8_t *) SDPRECORD;
leng[0] = 0;
leng[1] = SDPRECORD_BYTES;
hid_spec_lst = sdp_seq_alloc_with_length(dtds, values, leng, 2);
hid_spec_lst2 = sdp_data_alloc(SDP_SEQ8, hid_spec_lst);
sdp_attr_add(&record, SDP_ATTR_HID_DESCRIPTOR_LIST, hid_spec_lst2);
// and continue adding further data bytes for 0x206+x values
for (i = 0; i < sizeof(hid_attr_lang) / 2; i++) {
dtds2[i] = &dtd;
values2[i] = &hid_attr_lang[i];
}
lang_lst = sdp_seq_alloc(dtds2, values2, sizeof(hid_attr_lang) / 2);
lang_lst2 = sdp_data_alloc(SDP_SEQ8, lang_lst);
sdp_attr_add(&record, SDP_ATTR_HID_LANG_ID_BASE_LIST, lang_lst2);
sdp_attr_add_new ( &record, SDP_ATTR_HID_PROFILE_VERSION,
SDP_UINT16, &hid_attr2[0] );
sdp_attr_add_new ( &record, SDP_ATTR_HID_BOOT_DEVICE,
SDP_UINT16, &hid_attr2[1] );
// Submit our IDEA of a SDP record to the "sdpd"
if (sdp_record_register(session, &record, SDP_RECORD_PERSIST) < 0) {
fprintf ( stderr, "Service Record registration failed\n" );
return -1;
}
// Store the service handle retrieved from there for reference (i.e.,
// deleting the service info when this program terminates)
sdphandle = record.handle;
fprintf ( stdout, "HID keyboard/mouse service registered\n" );
return 0;
}
/*
* sdpunregister - Remove SDP entry for HID service on program termination
* Parameters: SDP handle (typically 0x10004 or similar)
*/
void sdpunregister ( uint32_t handle )
{
uint32_t range=0x0000ffff;
sdp_list_t * attr;
sdp_session_t * sess;
sdp_record_t * rec;
// Connect to the local SDP server
sess = sdp_connect(BDADDR_ANY, BDADDR_LOCAL, 0);
if ( !sess ) return;
attr = sdp_list_append(0, &range);
rec = sdp_service_attr_req(sess, handle, SDP_ATTR_REQ_RANGE, attr);
sdp_list_free(attr, 0);
if ( !rec ) {
sdp_close(sess);
return;
}
sdp_device_record_unregister(sess, BDADDR_ANY, rec);
sdp_close(sess);
// We do not care wether unregister fails. If it does, we cannot help it.
return;
}
static void add_lang_attr(sdp_record_t *r)
{
sdp_lang_attr_t base_lang;
sdp_list_t *langs = 0;
/* UTF-8 MIBenum (http://www.iana.org/assignments/character-sets) */
base_lang.code_ISO639 = (0x65 << 8) | 0x6e;
base_lang.encoding = 106;
base_lang.base_offset = SDP_PRIMARY_LANG_BASE;
langs = sdp_list_append(0, &base_lang);
sdp_set_lang_attr(r, langs);
sdp_list_free(langs, 0);
}
// Wrapper for bind, caring for all the surrounding variables
int btbind ( int sockfd, unsigned short port ) {
struct sockaddr_l2 l2a;
int i;
memset ( &l2a, 0, sizeof(l2a) );
l2a.l2_family = AF_BLUETOOTH;
bacpy ( &l2a.l2_bdaddr, BDADDR_ANY );
l2a.l2_psm = htobs ( port );
i = bind ( sockfd, (struct sockaddr *)&l2a, sizeof(l2a) );
if ( 0 > i )
{
fprintf ( stderr, "Bind error (PSM %d): %s\n",
port, strerror ( errno ) );
}
return i;
}
/*
* initfifo(filename) - creates (if necessary) and opens fifo
* instead of event devices. If filename exists and is NOT a fifo,
* abort with error.
*/
int initfifo ( char *filename )
{
struct stat ss;
if ( NULL == filename ) return 0;
if ( 0 == stat ( filename, &ss ) )
{
if ( ! S_ISFIFO(ss.st_mode) )
{
fprintf(stderr,"File [%s] exists, but is not a fifo.\n", filename );
return 0;
}
} else {
if ( 0 != mkfifo ( filename, S_IRUSR | S_IWUSR ) )
{ // default permissions for created fifo is rw------- (user=rw)
fprintf(stderr,"Failed to create new fifo [%s]\n", filename );
return 0;
}
}
eventdevs[0] = open ( filename, O_RDONLY | O_NONBLOCK );
if ( 0 > eventdevs[0] )
{
fprintf ( stderr, "Failed to open fifo [%s] for reading.\n", filename );
return 0;
}
return 1;
}
int inittty(const char *name)
{
struct termios rawttysettings;
if ( (eventdevs[TTY_FD_IDX] = open( name, O_RDONLY )) < 0 )
{
char buf[256];
snprintf(buf, sizeof(buf), "Opening %s failed", name);
perror(buf);
return 0;
}
if ( isatty( eventdevs[TTY_FD_IDX] ) )
{
if ( tcgetattr( eventdevs[TTY_FD_IDX], &origttysettings ) )
{
if ( ENOTTY == errno )
printf("XXX\n");
perror("Unable to retrieve TTY attributes");
close( eventdevs[TTY_FD_IDX] );
eventdevs[TTY_FD_IDX] = -1;
return 0;
}
rawttysettings = origttysettings;
cfmakeraw( &rawttysettings );
/* Still allow output processing (nicer printf output) */
rawttysettings.c_oflag |= OPOST;
if ( tcsetattr( eventdevs[TTY_FD_IDX], TCSAFLUSH, &rawttysettings ) )
{
perror("Unable to set TTY to raw mode");
tcsetattr( eventdevs[TTY_FD_IDX], TCSAFLUSH, &origttysettings );
close( eventdevs[TTY_FD_IDX] );
eventdevs[TTY_FD_IDX] = -1;
return 0;
}
}
printf("Opened TTY\n");
return 1;
}
/*
* initevents () - opens all required event files
* or only the ones specified by evdevmask, if evdevmask != 0
* try to disable in X11 if mutex11 is set to 1
* returns number of successfully opened event file nodes, or <1 for error
*/
int initevents ( unsigned int evdevmask, int mutex11 )
{
int i, j, k;
char buf[sizeof(EVDEVNAME)+8];
char *xinlist = NULL;
FILE *pf;
char *p, *q;
if ( mutex11 )
{
if ( NULL == ( xinlist = malloc ( 4096 ) ) )
{
printf ( "Memory alloc error\n" );
return 0;
}
bzero ( xinlist, 4096 );
if ( NULL != ( pf = popen ("xinput --list --short", "r" ) ) )
{
if ( 1 > fread ( xinlist, 1, 3800, pf ) )
{
printf ( "\tx11-mutable information not available.\n" );
free ( xinlist );
xinlist = NULL;
}
}
fclose ( pf );
}
for ( i = j = 0; j < MAXEVDEVS; ++j )
{
if ( ( evdevmask != 0 ) && ( ( evdevmask & ( 1 << j ) ) == 0 ) ) { continue; }
sprintf ( buf, EVDEVNAME, j );
eventdevs[i] = open ( buf, O_RDONLY );
if ( 0 <= eventdevs[i] )
{
fprintf ( stdout, "Opened %s as event device [counter %d]\n", buf, i );
if ( ( mutex11 > 0 ) && ( xinlist != NULL ) )
{
k = -1;
xinlist[3801] = 0;
if ( ioctl(eventdevs[i], EVIOCGNAME(256),xinlist+3801) >= 0 )
{
p = xinlist;
xinlist[4056] = 0;
if ( strlen(xinlist+3801) < 4 ) // min lenght for name
p = xinlist + 4056;
while ( (*p != 0) &&
( NULL != ( p = strstr ( p, xinlist+3801 ) ) ) )
{
q = p + strlen(xinlist+3801);
while ( *q == ' ' ) ++q;
if ( strncmp ( q, "\tid=", 4 ) == 0 )
{
k = atoi ( q + 4 );
p = xinlist + 4056;
} else {
p = q;
}
}
}
if ( k >= 0 ) {
sprintf ( xinlist+3801, "xinput set-int-prop %d \"Device "\
"Enabled\" 8 0", k );
if ( system ( xinlist + 3801 ) )
{
fprintf ( stderr, "Failed to x11-mute.\n" );
}
x11handles[i] = k;
}
}
++i;
}
}
if ( xinlist != NULL ) { free ( xinlist ); }
return i;
}
void closeevents ( void )
{
int i;
char buf[256];
for ( i = 0; i < MAXEVDEVS; ++i )
{
if ( eventdevs[i] >= 0 )
{
close ( eventdevs[i] );
if ( x11handles[i] >= 0 )
{
sprintf ( buf, "xinput set-int-prop %d \"Device "\
"Enabled\" 8 1", x11handles[i] );
if ( system ( buf ) )
{
fprintf ( stderr, "Failed to x11-unmute device %d.\n", i );
}
}
}
}
return;
}
void closefifo ( void )
{
if ( eventdevs[0] >= 0 )
close(eventdevs[0]);
return;
}
void closetty( void )
{
if ( eventdevs[TTY_FD_IDX] >= 0 )
{
if ( isatty( eventdevs[TTY_FD_IDX] ) )
{
tcsetattr( eventdevs[TTY_FD_IDX], TCSAFLUSH, &origttysettings );
}
close(eventdevs[TTY_FD_IDX]);
}
}
void cleanup_stdin ( void )
{
// Cleans everything but the characters after the last ENTER keypress.
// This is necessary BECAUSE while reading all keyboard input from the
// event devices, those key presses will still stay in the stdin queue.
// We do not want to have a backlog of hundreds of characters, possibly
// commands and so on.
fd_set fds;
struct timeval tv;
FD_ZERO ( &fds );
FD_SET ( 0, &fds );
tv.tv_sec = 0;
tv.tv_usec = 0;
char buf[8];
while ( 0 < select ( 1, &fds, NULL, NULL, &tv ) )
{
while ( read ( 0, buf, 8 ) ) {;}
FD_ZERO ( &fds );
FD_SET ( 0, &fds );
tv.tv_sec = 0;
tv.tv_usec = 1;
}
close ( 0 );
return;
}
int add_filedescriptors ( fd_set * fdsp )
{
// Simply add all open eventdev fds to the fd_set for select.
int i, j;
FD_ZERO ( fdsp );
j = -1;
for ( i = 0; i < MAXEVDEVS; ++i )
{
if ( eventdevs[i] >= 0 )
{
FD_SET ( eventdevs[i], fdsp );
if ( eventdevs[i] > j )
{
j = eventdevs[i];
}
}
}
return j;
}
/*
* list_input_devices - Show a human-readable list of all input devices
* the current user has permissions to read from.
* Add info wether this probably can be "muted" in X11 if requested
*/
int list_input_devices ()
{
int i, fd;
char buf[sizeof(EVDEVNAME)+8];
struct input_id device_info;
char namebuf[256];
char *xinlist;
FILE *pf;
char *p, *q;
char x11 = 0;
if ( NULL == ( xinlist = malloc ( 4096 ) ) )
{
printf ( "Memory alloc error\n" );
return 1;
}
bzero ( xinlist, 4096 );
if ( NULL != ( pf = popen ("xinput --list --name-only", "r" ) ) )
{
if ( 1 > fread ( xinlist, 1, 4095, pf ) )
{
printf ( "\tx11-mutable information not available.\n" );
}
fclose ( pf );
}
printf ( "List of available input devices:\n");
printf ( "num\tVendor/Product, Name, -x compatible (x/-)\n" );
for ( i = 0; i < MAXEVDEVS; ++i )
{
sprintf ( buf, EVDEVNAME, i );
fd = open ( buf, O_RDONLY );
if ( fd < 0 )
{
if ( errno == ENOENT ) { i = MAXEVDEVS ; break; }
if ( errno == EACCES )
{
printf ( "%2d:\t[permission denied]\n", i );
}
continue;
}
if ( ioctl ( fd, EVIOCGID, &device_info ) < 0 )
{
close(fd); continue;
}
if ( ioctl ( fd, EVIOCGNAME(sizeof(namebuf)-4), namebuf+2) < 0 )
{
close(fd); continue;
}
namebuf[sizeof(namebuf)-4] = 0;
x11 = 0;
p = xinlist;
while ( ( p != NULL ) && ( *p != 0 ) )
{
if ( NULL == ( q = strchr ( p, 0x0a ) ) ) { break; }
*q = 0;
if ( strcmp ( p, namebuf + 2 ) == 0 ) { x11 = 1; }
*q = 0x0a;
while ( (*q > 0) && (*q <= 0x20 ) ) { ++q; }
p = q;
}
printf("%2d\t[%04hx:%04hx.%04hx] '%s' (%s)", i,
device_info.vendor, device_info.product,
device_info.version, namebuf + 2, x11 ? "+" : "-");
printf("\n");
close ( fd );
}
free ( xinlist );
return 0;
}
/*
* HID is unfortunately very old and stupid. It has, in particular,
* no support for UTF-8 (which we could simply forward) but only
* supports what basically are the scan-codes of a PS1 keyboard.
* Non-ASCII characters are marginally supported the same way they
* were in the 1980 - the manufacturer painted different symbols
* on some of the keys (e.g., where a US keyboard has the ';'
* character the German keyboard features 'ö').
* - translation of scancode to language-specific character has to
* be performed on the destination device (by selecting a different
* keyboard layout there (e.g., on android).
* - only a small set of foreign characters may be 'emulated'.
* - If we (i.g., hidclient) receive a UTF-8 character then we
* have to translate that back to a PS1 scancode (assuming a
* particular layout) and rely on the peer to activate the same
* layout (:-().
*
*/
/*
UTF-8 of
á: C3, A1,
é: C3, A9,
í: C3, AD,
ó: C3, B3,
ú: C3, BA
Á: C3, 81,
É: C3, 89,
Í: C3, 8D,
Ó: C3, 93,
Ú: C3, 9A
ä: C3, A4
ö: C3, B6
ü: C3, BC
Ä: C3, 84
Ö: C3, 96
Ü: C3, 9C
ñ: C3, B1
Ñ: C3, 91
¡: C2, A1
¿: C2, BF
*/
struct UTF8C3Map {
char u;
char ps1;
};
static struct UTF8C3Map utf8c3map [] = {
{ 0x81, 0x04 }, /* Á */
{ 0x84, 0x14 }, /* Ä */
{ 0x89, 0x08 }, /* É */
{ 0x8D, 0x0C }, /* Í */
{ 0x91, 0x11 }, /* Ñ */
{ 0x93, 0x12 }, /* Ó */
{ 0x96, 0x13 }, /* Ö */
{ 0x9A, 0x18 }, /* Ú */
{ 0x9C, 0x1C }, /* Ü */
};
static struct AsciiMap *findAscii(int ch)
{
int i = 0;
int m;
int j = sizeof(asciimap)/sizeof(asciimap[0]) - 1;
while ( i <= j ) {
m = (i+j)/2;
if ( asciimap[m].ascii > ch )
j = m - 1;
else if ( asciimap[m].ascii < ch )
i = m + 1;
else
return asciimap + m;
}
return 0;
}
static int mapAscii(struct hidrep_keyb_t *keyb, int ch)
{
/* Basic ASCII */
int sendkeys = 0;
if ( isascii( ch ) )
{
struct AsciiMap *mapItem;
if ( isalpha( ch ) )
{
if ( isupper( ch ) )
{
keyb->modify |= MOD_L_SHFT;
}
ch = toupper( ch );
keyb->key[sendkeys++] = ch - 'A' + 4;
} else if ( isdigit( ch ) ) {
if ( '0' == ch ) {
ch += 10;
}
keyb->key[sendkeys++] = ch - '1' + 0x1e;
} else if ( (mapItem = findAscii( ch )) )
{
keyb->key[sendkeys++] = mapItem->ps1;
keyb->modify |= mapItem->mod;
}
}
return sendkeys;
}
static int mapAnsiEsc(struct hidrep_keyb_t *keyb, unsigned char *buf, int bufsz)
{
int sendkeys = 0;
if ( 3 == bufsz && 0x1b == buf[0] && '[' == buf[1] )
{
int ps1;
switch ( buf[2] )
{
case 'A': ps1 = 0x52; break; /* UP */
case 'B': ps1 = 0x51; break; /* DOWN */
case 'C': ps1 = 0x4f; break; /* RIGHT */
case 'D': ps1 = 0x50; break; /* LEFT */
case 'F': ps1 = 0x4D; break; /* End */
case 'H': ps1 = 0x4A; break; /* HOME */
default: ps1 = 0x00; break;
}
if ( ps1 )
{
keyb->key[sendkeys++] = ps1;
}
}
return sendkeys;
}
/* Map some (very few) UTF8 chars to PS1 'ALT' keys */
static int mapUTF8(struct hidrep_keyb_t *keyb, unsigned char *buf, int bufsz)
{
int sendkeys = 0;
int i;
if ( bufsz != 2 )
{
return 0;
}
if ( 0xC3 == buf[0] )
{
char uLow = buf[1] & ~0x20;
for ( i = 0; i < sizeof(utf8c3map)/sizeof(utf8c3map[0]); i++ ) {
if (utf8c3map[i].u == uLow) {
keyb->key[sendkeys++] = utf8c3map[i].ps1;
if ( ! (buf[1] & 0x20) )
{
keyb->modify |= MOD_L_SHFT;
}
break;
}
}
}
else if ( 0xC2 == buf[0] )
{
if ( 0xA1 == buf[1] )
{
/* ¡ */
keyb->key[sendkeys++] = 0x1E;
}
else if ( 0xBF == buf[1] )
{
/* ¿ */
keyb->key[sendkeys++] = 0x38;
}
}
if ( sendkeys )
{
keyb->modify |= MOD_R_ALT;
}
return sendkeys;
}
int parse_tty ( fd_set *efds, int sockdesc )
{
struct hidrep_keyb_t keyb;
int j,i,nkeys;
unsigned char buf[sizeof(keyb.key)];
int sendkeys = 0;
if ( efds == NULL ) { return -1; }
keyb.btcode = 0xA1;
keyb.rep_id = REPORTID_KEYBD;
keyb.modify = 0;
memset( keyb.key, 0, sizeof(keyb.key) );
if ( ! FD_ISSET( eventdevs[TTY_FD_IDX], efds ) )
{
return 0;
}
nkeys = read( eventdevs[TTY_FD_IDX], buf, sizeof(buf) );
if ( nkeys <= 0 )
{
if ( 0 == nkeys )
{
if ( debugevents & 0x1 ) fprintf(stderr,".");
return 0;
}
else
{
if ( debugevents & 0x1 )
{
if ( errno > 0 )
{
fprintf(stderr,"%d|%d(%s) (expected at least %d bytes). ",eventdevs[TTY_FD_IDX],errno,strerror(errno), 1);
}
else
{