Linux 如何使用 C 程序获取机器的 MAC 地址？
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How to get MAC address of your machine using a C program?
提问by David Murdoch
This question is exactly like this question: How to get MAC address of your machine using a C program?
这个问题和这个问题完全一样：How to get the MAC address of your machine using a C program?
"I am working on Ubuntu. How can I get MAC address of my machine or an interface say eth0 using C program."
“我在 Ubuntu 上工作。如何使用 C 程序获取我的机器的 MAC 地址或接口说 eth0。”
Now, I don't usually touch C...but in this case I have to. Since I don't really know what is going on in the following code, which was taken from the answer linked to above, I need some help.
现在，我通常不碰 C ......但在这种情况下我必须这样做。由于我真的不知道下面的代码发生了什么，这是从上面链接的答案中获取的，我需要一些帮助。
#include <sys/socket.h>
#include <sys/ioctl.h>
#include <linux/if.h>
#include <netdb.h>
#include <stdio.h>
int main()
{
struct ifreq s;
int fd = socket(PF_INET, SOCK_DGRAM, IPPROTO_IP);
strcpy(s.ifr_name, "eth0");
if (0 == ioctl(fd, SIOCGIFHWADDR, &s)) {
int i;
for (i = 0; i < 6; ++i)
printf(" %02x", (unsigned char) s.ifr_addr.sa_data[i]);
puts("\n");
return 0;
}
return 1;
}
Instead of a function that prints the MAC Address I need a function that returns it as a string. You know, like this:
我需要一个将其作为字符串返回的函数，而不是打印 MAC 地址的函数。你知道，像这样：
const char * gettaStringFromNativeCode(void)
{
return "This is a string";
}
This is to be used with Mozilla Chromeless, which uses Firefox's new JCTYPES like this.
这将与Mozilla Chromeless一起使用，它像这样使用 Firefox 的新 JCTYPES 。
Basically, I'm looking to do something like this (borrowing from C#):
基本上，我希望做这样的事情（从 C# 借来）：
// Using "string" here because its pseudo-code and I don't know what i'm doing. :-)
string getMAC()
{
struct ifreq s;
int fd = socket(PF_INET, SOCK_DGRAM, IPPROTO_IP);
strcpy(s.ifr_name, "eth0");
var macAddress = string.Empty; // yah, this is actually C#
if (0 == ioctl(fd, SIOCGIFHWADDR, &s)) {
int i;
for (i = 0; i < 6; ++i)
// yah, this is a bit of C# too.
macAddress += string.Format(" %02x", (unsigned char) s.ifr_addr.sa_data[i]) );
}
return macAddress;
}
采纳答案by Seth Robertson
#include <sys/socket.h>
#include <sys/ioctl.h>
#include <linux/if.h>
#include <netdb.h>
#include <stdio.h>
char *getmac(char *iface)
{
#define MAC_STRING_LENGTH 13
char *ret = malloc(MAC_STRING_LENGTH);
struct ifreq s;
int fd = socket(PF_INET, SOCK_DGRAM, IPPROTO_IP);
strcpy(s.ifr_name, iface);
if (fd >= 0 && ret && 0 == ioctl(fd, SIOCGIFHWADDR, &s))
{
int i;
for (i = 0; i < 6; ++i)
snprintf(ret+i*2,MAC_STRING_LENGTH-i*2,"%02x",(unsigned char) s.ifr_addr.sa_data[i]);
}
else
{
perror("malloc/socket/ioctl failed");
exit(1);
}
return(ret);
}
int main()
{
char *mac = getmac("eth0");
printf("%s\n",mac);
free(mac);
}
回答by Andrey Sidorov
int getMac(char mac[6])
{
struct ifreq s;
int fd = socket(PF_INET, SOCK_DGRAM, IPPROTO_IP);
strcpy(s.ifr_name, "eth0");
if (0 == ioctl(fd, SIOCGIFHWADDR, &s)) {
int i;
for (i = 0; i < 6; ++i)
mac[i] = s.ifr_addr.sa_data[i];
close(fd);
return 0;
}
close(fd);
return 1;
}
