linux下获取网卡IP地址、MAC地址、RX_BYTES、TX_BYTES

第一次写博客，希望将自己学到的的东西记录下来，同时也分享给大家。

如果你看到我写的文章，若有不到之处，还望多多指教。

我们进入正题吧：在linux下面获取网卡IP地址、MAC地址、RX_BYTES、TX_BYTES。

我的思路是：

1、读取“/proc/net/dev”这个路径文件，获取rx_bytes、tx_bytes的值

2、在这个文件中记录网络接口的名称，再通过socket与ioctl获取IP地址与MAC地址。

代码如下：

#include 
#include 
#include 
#include 
#include 
#include 
#include 
#include 
#include 
#include 
using namespace std;

struct net{
	char name[128];
	char mac[30];
	char ip[30];
	unsigned long long rx_bytes;
	unsigned long long tx_bytes;
};

enum if_item
{
	RX_BYTES = 0,
	RX_PACKETS,
	RX_ERRS,
	RX_DROP,
	RX_FIFO,
	RX_FRAME,
	RX_COMPRESSED,
	RX_MULTICAST,
	TX_BYTES,
	TX_PACKETS,
	TX_ERRS,
	TX_DROP,
	TX_FIFO,
	TX_COLLS,
	TX_CARRIER,
	TX_COMPRESSED,
	IF_ITEM_MAX
};

int AdapterCount(struct net* Adapter)
{
	int nCount=0;
	FILE* fp = fopen("/proc/net/dev", "r");//打开系统文件查看网卡接口
	if(!fp)
	{
		perror("fopen /proc/net/dev");
		exit(0);
	}
	char szline[1024] = {0};
	fgets(szline, sizeof(szline), fp);//跳过前面两行
	fgets(szline, sizeof(szline), fp);

	int i=0;
	struct ifreq ifr_mac_ip;//保存IP MAC地址的结构体
	struct sockaddr_in* ipaddr;
	int s = socket(AF_INET, SOCK_STREAM, 0);//创建socket接口
	memset(szline, 0, sizeof(szline));
	//跳过前两行，后面一行代表一个网卡的信息，循环读取每个网卡的信息
	while(fgets(szline, sizeof(szline), fp) != NULL)
	{
		//分析字符串，获取网卡名称
		string name = szline;
		int p1 = name.find_first_of(':', 0);//查找第一个出现：的位置
		name = name.substr(0, p1);//字符串截取
		int p2 = name.rfind(' ', -1);//字符串截取后从后往前第一个出现空格的位置
		if(p2 != -1)//如果有空间，字符串再字截取
		{
			name = name.substr(p2+1, -1);
		}
		memcpy(Adapter[i].name, name.c_str(), strlen(name.c_str()));//将名字保存到数组中

		
		unsigned long long data[32] = {0};
		sscanf(szline+p1+1, "%llu %llu %llu %llu %llu %llu %llu %llu %llu %llu %llu %llu %llu %llu %llu %llu", 
			data + RX_BYTES,
			data + RX_PACKETS,
			data + RX_ERRS,
			data + RX_DROP,
			data + RX_FIFO,
			data + RX_FRAME,
			data + RX_COMPRESSED,
			data + RX_MULTICAST,
			
			data + TX_BYTES,
			data + TX_PACKETS,
			data + TX_ERRS,
			data + TX_DROP,
			data + TX_FIFO,
			data + TX_COLLS,
			data + TX_CARRIER,
			data + TX_COMPRESSED);

		Adapter[i].rx_bytes = data[RX_BYTES];//网卡接收流量
		Adapter[i].tx_bytes = data[TX_BYTES];//网卡输出流量

		memcpy(ifr_mac_ip.ifr_name, name.c_str(), strlen(name.c_str()));//将名字赋值给结构
		
		//查找IP
		ioctl(s, SIOCGIFADDR , &ifr_mac_ip);
		ipaddr = (struct sockaddr_in*)&ifr_mac_ip.ifr_addr;
		char ipbuff[20] = {0};
		strcpy(ipbuff, inet_ntoa(ipaddr->sin_addr));
		memcpy(Adapter[i].ip, ipbuff,  strlen(ipbuff));

		//查找MAC
		ioctl(s, SIOCGIFHWADDR, &ifr_mac_ip);
		char macbuff[30] = {0};
		sprintf(macbuff, "%02x:%02x:%02x:%02x:%02x:%02x",
				(unsigned char)ifr_mac_ip.ifr_hwaddr.sa_data[0],
				(unsigned char)ifr_mac_ip.ifr_hwaddr.sa_data[1],
				(unsigned char)ifr_mac_ip.ifr_hwaddr.sa_data[2],
				(unsigned char)ifr_mac_ip.ifr_hwaddr.sa_data[3],
				(unsigned char)ifr_mac_ip.ifr_hwaddr.sa_data[4],
				(unsigned char)ifr_mac_ip.ifr_hwaddr.sa_data[5]);
		memcpy(Adapter[i].mac, macbuff, strlen(macbuff));//保存MAC地址

		i++;	
		nCount++;//网卡数量相加	
		memset(szline, 0, sizeof(szline));//每循环一次，数据清0
	}

	fclose(fp);
	close(s);
	return nCount;
}

int main()
{
	struct net netlist[20]={0};
	int j = AdapterCount((struct net*)&netlist);
	for(int i=0; i