目录
- 1. 内核配置
- 2. 设备配置
- 附 wireshark USB抓包配置
linux下模拟USB HID设备的简单记录，其他USB设备类似。
1. 内核配置
内核启用USB Gadget，使用fs配置usb device信息。
Device Drivers ---> [*] USB support ---><*> USB Gadget Support ---><*> USB Gadget functions configurable through configfs [*] HID function<*> USB Gadget precomposed configurations (Function Filesystem) --->
2. 设备配置
HID设备配置如下，需要将该shell函数添加到启动脚本中，并调用。
usb_hid_device_config()
{if [ -d /sys/kernel/config/usb_gadget/ ] ; then######USB HID Device config######cd /sys/kernel/config/usb_gadget/mkdir -p isticktoitcd isticktoitecho 0x0483 > idVendorecho 0x5710 > idProduct # STM32echo 0x0215 > bcdDevice # v1.0.0echo 0x0200 > bcdUSB # USB2mkdir -p strings/0x409echo "xxxxxx" > strings/0x409/serialnumberecho "xxxxxx" > strings/0x409/manufacturerecho "xxxxxx" > strings/0x409/productmkdir -p configs/c.1/strings/0x409echo "HID_CONFIGUE" > configs/c.1/strings/0x409/configurationecho 2 > configs/c.1/MaxPower# Add functions heremkdir -p functions/hid.usb0echo 0 > functions/hid.usb0/protocolecho 0 > functions/hid.usb0/subclassecho 64 > functions/hid.usb0/report_length# Set HID in/out descecho -ne \\x05\\x81\\x09\\x82\\xa1\\x01\\x09\\x83\\x09\\x84\\x15\\x00\\x26\\xff\\x00\\x75\\x08\\x95\\x40\\x81\\x02\\x09\\x84\\x15\\x00\\x26\\xff\\x00\\x75\\x08\\x95\\x40\\x91\\x02\\xc0 > functions/hid.usb0/report_descln -s functions/hid.usb0 configs/c.1/# End functionsls /sys/class/udc > UDC######USB HID Device end######elseerrlog "usb_gadget not found!"return 1fi
}
- 示例demo
usb设备节点为/dev/hidg0，以下为应用层USB收发示例；
/* hid_gadget_test */#include <pthread.h>
#include <string.h>
#include <stdio.h>
#include <ctype.h>
#include <fcntl.h>
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>#define BUF_LEN 512
struct options {const char *opt;unsigned char val;
};#define __is_print(ch) ((unsigned int)((ch) - ' ') < 127u - ' ')
#define HEXDUMP_WIDTH 16void debug_hexdump(unsigned char *data, unsigned long size, unsigned char *headinfo)
{unsigned long i, j;unsigned long addr;printf("%s 0x%08X, size is %ld. The data is:\n", headinfo, addr,size);printf("Offset (h) 00 01 02 03 04 05 06 07 08 09 0A 0B 0C 0D 0E 0F\n");for (i = 0; i < size; i += HEXDUMP_WIDTH){printf("[%08X] ", addr + i);/* dump hex */for (j = 0; j < HEXDUMP_WIDTH; j++){if (i + j < size){printf("%02X ", data[i + j]);}else{printf(" ");}}/* dump char for hex */for (j = 0; j < HEXDUMP_WIDTH; j++){if (i + j < size){printf("%c", __is_print(data[i + j]) ? data[i + j] : '.');}}printf("\n");}printf("\n");
}int main(int argc, const char *argv[])
{const char *filename = NULL;int fd = 0;char buf[BUF_LEN];int cmd_len;char report[64] = {0};int to_send = 8;int hold = 0;fd_set rfds;int retval, i;if (argc < 2) {fprintf(stderr, "Usage: %s devname\n",argv[0]);return 1;}filename = argv[1];if ((fd = open(filename, O_RDWR|O_DSYNC, 0666)) == -1) {perror(filename);return 3;}while (1) {FD_ZERO(&rfds);FD_SET(fd, &rfds);retval = select(fd + 1, &rfds, NULL, NULL, NULL);if (retval == -1 && errno == EINTR)continue;if (retval < 0) {perror("select()");return 4;}if (FD_ISSET(fd, &rfds)) {cmd_len = read(fd, buf, BUF_LEN - 1);
#ifdef HEX_DEBUGdebug_hexdump(buf, cmd_len, "recv report");
#endif}}close(fd);return 0;
}
附 wireshark USB抓包配置
安装wireshark 时同时安装USB抓包工具usbpcap后，打开wireshark有两个USB捕获接口
我们可以设置其中一个只抓取新接入的设备
- USBPcap1 作用可指定抓取未接入的USB设备
- USBPcap2 作用是抓取所有已接入的USB设备及新设备
配置后打开即可抓取新接入USB设备的所有USB包并解析。
