go语言，取linux系统网卡MAC和硬盘序列号

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本文展示了如何使用Go语言结合cgo调用C语言函数，以获取Linux系统的网络接口（如eth0）的MAC地址和硬盘（如/dev/sda）的序列号。通过示例代码详细解释了cgo的使用方法以及错误处理。

利用cgo，实现在go语言中调用c语言函数，取MAC和硬盘序列号。cgo中需要注意的：*/和import "C"两行之间不能有其它内容！

package main

/*
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/socket.h>
#include <sys/ioctl.h>
#include <net/if.h>
#include <unistd.h>

#include <errno.h>
#include <fcntl.h>
#include <linux/hdreg.h>

char * mac_serial(char *iface){
int fd;
struct ifreq ifr;
unsigned char *mac = NULL;
char *rtn=malloc(21);

errno=0;
memset(&ifr, 0, sizeof(ifr));

fd = socket(AF_INET, SOCK_DGRAM, 0);

ifr.ifr_addr.sa_family = AF_INET;
strncpy(ifr.ifr_name , iface , IFNAMSIZ-1);

if (0 == ioctl(fd, SIOCGIFHWADDR, &ifr)) {
mac = (unsigned char *)ifr.ifr_hwaddr.sa_data;

sprintf(rtn,"%.2X:%.2X:%.2X:%.2X:%.2X:%.2X" , mac[0], mac[1], mac[2], mac[3], mac[4], mac[5]);
}

close(fd);

return rtn;
}

char * disk_serial(char *devname)
{
   static struct hd_driveid hd;
   int fd;
   char *rtn=malloc(21);
   errno=0;

if (geteuid() > 0) { //not root
errno=1;
return NULL;
}

if ((fd = open(devname, O_RDONLY|O_NONBLOCK)) < 0) { //can't open
errno=2;
return NULL;
}

if (!ioctl(fd, HDIO_GET_IDENTITY, &hd)) {
       sprintf(rtn,"%.20s",hd.serial_no);
       return rtn;
} else if (errno == -ENOMSG) {
       errno=3;
       return NULL;
} else { //HDIO_GET_IDENTITY
       errno=4;
       return NULL;
}
}

*/
import "C"
import "unsafe"
import "fmt"
import "os"

func main(){
fmt.Print("=====golang, network mac & disk serial =====\n")

ethName :="eth0" //enp03s
diskName :="/dev/sda"

   if len(os.Args)>=2 {
       ethName=os.Args[1]
       diskName=os.Args[2]
   }

   mac,err0 := C.mac_serial(C.CString(ethName))
   defer C.free(unsafe.Pointer(mac))
   if err0 == nil{
       fmt.Printf("mac_serial:%s\n",C.GoString(mac))
   } else{
       fmt.Printf("mac_serial error:%s\n",err0)
   }

   str1,err := C.disk_serial(C.CString(diskName))
   defer C.free(unsafe.Pointer(str1))
   if err == nil{
       fmt.Printf("disk_serial:%s\n",C.GoString(str1))
   } else{
       fmt.Printf("disk_serial error:%s\n",err)
   }
}