Android Debug Bridge Debugger

adbddb.cpp

#include <errno.h>
#include <fcntl.h>
#include <linux/usb/ch9.h>
#include <linux/usbdevice_fs.h>
#include <sys/ioctl.h>
#include <sys/types.h>
#include <unistd.h>

#include <cstdio>
#include <iostream>

constexpr uint8_t kCNXN[] = {
    0x43, 0x4e, 0x58, 0x4e, 0x00, 0x00, 0x00, 0x01, 0x00, 0x00, 0x04,
    0x00, 0x1b, 0x00, 0x00, 0x00, 0x4d, 0x0a, 0x00, 0x00, 0xbc, 0xb1,
    0xa7, 0xb1, 0x68, 0x6f, 0x73, 0x74, 0x3a, 0x3a, 0x66, 0x65, 0x61,
    0x74, 0x75, 0x72, 0x65, 0x73, 0x3d, 0x63, 0x6d, 0x64, 0x2c, 0x73,
    0x68, 0x65, 0x6c, 0x6c, 0x5f, 0x76, 0x32,
};

ssize_t usb_bulk_write(int fd, const void *data, size_t len) {
  usbdevfs_urb urb = {
      .type = USBDEVFS_URB_TYPE_BULK, .endpoint = 0x01, .status = -1,
  };
  urb.buffer = const_cast<void *>(data);
  urb.buffer_length = len;

  if (ioctl(fd, USBDEVFS_SUBMITURB, &urb) == -1) {
    perror("ioctl(USBDEVFS_SUBMITURB)");
    return -1;
  }
	usbdevfs_urb* result = nullptr;
	if (ioctl(fd, USBDEVFS_REAPURB, &result) == -1) {
		perror("ioctl(USBDEVFS_REAPURB)");
		return -1;
	}
	if (result != &urb) {
		fprintf(stderr, "Unknown urb!\n");
		return -1;
	}
	if (urb.status != 0) {
		errno = -urb.status;
		perror("write");
		return -1;
	}

  return urb.actual_length;
}

ssize_t usb_bulk_read(int fd, const void *data, size_t len) {
  usbdevfs_urb urb = {
      .type = USBDEVFS_URB_TYPE_BULK, .endpoint = 0x81, .status = -1,
  };
  urb.buffer = const_cast<void *>(data);
  urb.buffer_length = len;

  if (ioctl(fd, USBDEVFS_SUBMITURB, &urb) == -1) {
    perror("ioctl(USBDEVFS_SUBMITURB)");
    return -1;
  }
	usbdevfs_urb* result = nullptr;
	if (ioctl(fd, USBDEVFS_REAPURB, &result) == -1) {
		perror("ioctl(USBDEVFS_REAPURB)");
		return -1;
	}
	if (result != &urb) {
		fprintf(stderr, "Unknown urb!\n");
		return -1;
	}
	if (urb.status != 0) {
		errno = -urb.status;
		perror("read");
		return -1;
	}

  return urb.actual_length;
}

int main(int argc, char* argv[]) {
  int fd = open(argv[1], O_RDWR | O_CLOEXEC);
  if (fd == -1) {
    perror("open");
    return 1;
  }
  int interface = 0;
  if (ioctl(fd, USBDEVFS_CLAIMINTERFACE, &interface) != 0) {
    perror("ioctl(USBDEVFS_CLAIMINTERFACE)");
    return 1;
  }
	ssize_t written = usb_bulk_write(fd, kCNXN, sizeof(kCNXN));
  if (written <= 0) {
    perror("usb_bulk_write");
    return 1;
  }
	printf("Wrote %zd / %zd\n", written, sizeof(kCNXN));
	char buf[4096];
	ssize_t read_bytes = usb_bulk_read(fd, buf, sizeof(buf));
	if (read_bytes <= 0) {
		perror("usb_bulk_read");
		return 1;
	}
	printf("Read %zd bytes!\n", read_bytes);
  return 0;
}