#include <stdio.h>
#include <string.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>
void getHostIp(char* netDev, char*ipaddress)
{
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, netDev, IFNAMSIZ);
ifr.ifr_name[IFNAMSIZ - 1] = 0;
if (ioctl(sock, SIOCGIFADDR, &ifr) < 0)
{
perror("ioctl");
//return -1;
}
memcpy(&sin, &ifr.ifr_addr, sizeof(sin));
sprintf(ipaddress, "%s", inet_ntoa(sin.sin_addr));
//return sin.sin_addr;
//return 0;
}
void main()
{
char ipaddress[16];
getHostIp((char *)"eth0", ipaddress);
printf("ip=%s\n", ipaddress);
}