获取服务器ip地址

#include < stdio.h >
#include < sys / types.h >
#include < sys / socket.h >
#include < sys / ioctl.h >
#include < netinet / in .h >
#include < net / if .h >
#include < net / if_arp.h >
#include < arpa / inet.h >
#include < errno.h >
#include < string .h >
#define ETH_NAME "eth1"

int main()
{
int sock;
struct sockaddr_in sin;
struct ifreq ifr;

sock = socket(AF_INET, SOCK_DGRAM, 0 );
if (sock == - 1 )
{
perror( " socket " );
return - 1 ;
}

strncpy(ifr.ifr_name, ETH_NAME, IFNAMSIZ);
ifr.ifr_name[IFNAMSIZ - 1 ] = 0 ;

if (ioctl(sock, SIOCGIFADDR, & ifr) < 0 )
{
perror( " ioctl " );
return - 1 ;
}

memcpy( & sin, & ifr.ifr_addr, sizeof (sin));
fprintf(stdout, " eth0: %s\n " , inet_ntoa(sin.sin_addr));

return 0 ;
}

上述代码有个毛病，只能获取一张网卡的ip地址。哎呀哎呀，真的很难得获得所有网卡的ip地址

不知道怎么获取。

下述代码就无敌了。什么都可以获取。

#include < stdio.h >
#include < unistd.h >
#include < iostream >
using namespace std;
int main()
{
FILE * fp = popen( " /sbin/ifconfig -a | grep -v inet6 | awk '/inet/{print $2}' | awk -F: '{print $2}' " , " r " );
char str[ 1024 ];
fread(str, sizeof (str), 1 ,fp);
cout << str;
pclose(fp);
}
~

转载于:https://www.cnblogs.com/xloogson/archive/2011/07/04/2097363.html