直接扔程式碼:

#include <iostream>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <net/if.h>
#include <netdb.h>
#include <arpa/inet.h>
#include <sys/ioctl.h>

using namespace std;
void show_all_if()
{	
	int fdSock = 0;
	struct ifconf ifMyConf;
	struct ifreq ifMyReq;
	char szBuf[20480] = {0};
	char * ip;
	
	
	ifMyConf.ifc_len = 2048;
	ifMyConf.ifc_buf = szBuf;

	if((fdSock = socket (AF_INET, SOCK_DGRAM, 0)) < 0  )
	{
		cout << "socket error" <<endl;
		return;
	}

	if(ioctl (fdSock, SIOCGIFCONF, &ifMyConf))
	{
		close(fdSock);
		cout << "ioctl error \n"<<endl;
		return;
	}
	
	ifreq *it = ifMyConf.ifc_req;
	const struct ifreq * const end = it + (ifMyConf.ifc_len / sizeof(struct ifreq));


	for(;it != end; ++it)
	{
		strcpy(ifMyReq.ifr_name, it->ifr_name);
		cout<< ifMyReq.ifr_name <<endl;
		if(ioctl(fdSock, SIOCGIFADDR, &ifMyReq) == 0)
		{
			string strAddr;
			struct sockaddr_in *sin;
			sin = (struct sockaddr_in*) &ifMyReq.ifr_addr;

			strAddr = (const char *) inet_ntoa(sin->sin_addr);
			cout << "ip addr : "<<strAddr.c_str()<<endl;
		}
		else
		{
			cout << "get mac info error \n"<<endl;
		}


		if(ioctl(fdSock, SIOCGIFNETMASK, &ifMyReq) == 0)
		{
			string strMask;
			struct sockaddr_in *sin;
			sin = (struct sockaddr_in*) &ifMyReq.ifr_netmask;

			strMask = (const char *) inet_ntoa(sin->sin_addr);
			cout << "net mask : "<<strMask.c_str()<<endl;
		}
		else
		{
			cout << "get mask info error \n"<<endl;
		}

		if(strstr(ifMyReq.ifr_name, "ppp"))
		{
			if((ioctl(fdSock, SIOCGIFDSTADDR, &ifMyReq)) == 0)
			{
				string strAddr;
				struct sockaddr_in *sin;
				sin = (struct sockaddr_in*) &ifMyReq.ifr_dstaddr;
				strAddr = (const char *) inet_ntoa(sin->sin_addr);
				cout << "P-T-P : "<<strAddr.c_str()<<endl;
			}
			else
			{
				cout << "get P-T-P info error \n"<<endl;
			}
		}
	}







	



	close(fdSock);

	
}


int main ()
{
	show_all_if();
	system("read");
}