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@NeonLightning
Created July 25, 2021 18:25
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/*
* sixpair.c version 2007-04-18
* Compile with: gcc -o sixpair sixpair.c -lusb
*/
#include <string.h>
#include <unistd.h>
#include <stdio.h>
#include <usb.h>
#define VENDOR 0x054c
#define PRODUCT 0x0268
#define USB_DIR_IN 0x80
#define USB_DIR_OUT 0
void fatal(char *msg) { perror(msg); exit(1); }
void show_master(usb_dev_handle *devh, int itfnum) {
printf("Current Bluetooth master: ");
unsigned char msg[8];
int res = usb_control_msg
(devh, USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE,
0x01, 0x03f5, itfnum, (void*)msg, sizeof(msg), 5000);
if ( res < 0 ) { perror("USB_REQ_GET_CONFIGURATION"); return; }
printf("%02x:%02x:%02x:%02x:%02x:%02x\n",
msg[2], msg[3], msg[4], msg[5], msg[6], msg[7]);
}
void set_master(usb_dev_handle *devh, int itfnum, int mac[6]) {
printf("Setting master bd_addr to %02x:%02x:%02x:%02x:%02x:%02x\n",
mac[0], mac[1], mac[2], mac[3], mac[4], mac[5]);
char msg[8]= { 0x01, 0x00, mac[0],mac[1],mac[2],mac[3],mac[4],mac[5] };
int res = usb_control_msg
(devh,
USB_DIR_OUT | USB_TYPE_CLASS | USB_RECIP_INTERFACE,
0x09,
0x03f5, itfnum, msg, sizeof(msg),
5000);
if ( res < 0 ) fatal("USB_REQ_SET_CONFIGURATION");
}
void process_device(int argc, char **argv, struct usb_device *dev,
struct usb_config_descriptor *cfg, int itfnum) {
int mac[6], have_mac=0;
usb_dev_handle *devh = usb_open(dev);
if ( ! devh ) fatal("usb_open");
usb_detach_kernel_driver_np(devh, itfnum);
int res = usb_claim_interface(devh, itfnum);
if ( res < 0 ) fatal("usb_claim_interface");
show_master(devh, itfnum);
if ( argc >= 2 ) {
if ( sscanf(argv[1], "%x:%x:%x:%x:%x:%x",
&mac[0],&mac[1],&mac[2],&mac[3],&mac[4],&mac[5]) != 6 ) {
printf("usage: %s [<bd_addr of master>]\n", argv[0]);
exit(1);
}
} else {
FILE *f = popen("hcitool dev", "r");
if ( !f ||
fscanf(f, "%*s\n%*s %x:%x:%x:%x:%x:%x",
&mac[0],&mac[1],&mac[2],&mac[3],&mac[4],&mac[5]) != 6 ) {
printf("Unable to retrieve local bd_addr from `hcitool dev`.\n");
printf("Please enable Bluetooth or specify an address manually.\n");
exit(1);
}
pclose(f);
}
set_master(devh, itfnum, mac);
usb_close(devh);
}
int main(int argc, char *argv[]) {
usb_init();
if ( usb_find_busses() < 0 ) fatal("usb_find_busses");
if ( usb_find_devices() < 0 ) fatal("usb_find_devices");
struct usb_bus *busses = usb_get_busses();
if ( ! busses ) fatal("usb_get_busses");
int found = 0;
struct usb_bus *bus;
for ( bus=busses; bus; bus=bus->next ) {
struct usb_device *dev;
for ( dev=bus->devices; dev; dev=dev->next) {
struct usb_config_descriptor *cfg;
for ( cfg = dev->config;
cfg < dev->config + dev->descriptor.bNumConfigurations;
++cfg ) {
int itfnum;
for ( itfnum=0; itfnum<cfg->bNumInterfaces; ++itfnum ) {
struct usb_interface *itf = &cfg->interface[itfnum];
struct usb_interface_descriptor *alt;
for ( alt = itf->altsetting;
alt < itf->altsetting + itf->num_altsetting;
++alt ) {
if ( dev->descriptor.idVendor == VENDOR &&
dev->descriptor.idProduct == PRODUCT &&
alt->bInterfaceClass == 3 ) {
process_device(argc, argv, dev, cfg, itfnum);
++found;
}
}
}
}
}
}
if ( ! found ) printf("No controller found on USB busses.\n");
return 0;
}
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