#include <sys/ioctl.h>

#include <sys/types.h>

#include <sys/socket.h>

#include <netinet/in.h>

#include <arpa/inet.h>

#include <net/if.h>

#include <error.h>

#include <net/route.h>

 

int SetIfAddr(char *ifname, char *Ipaddr, char *mask,char *gateway)

{

    int fd;

    int rc;

    struct ifreq ifr;

    struct sockaddr_in *sin;

    struct rtentry  rt;

   

    fd = socket(AF_INET, SOCK_DGRAM, 0);

    if(fd < 0)

    {

            perror("socket   error");    

            return -1;    

    }

    memset(&ifr,0,sizeof(ifr));

    strcpy(ifr.ifr_name,ifname);

    sin = (struct sockaddr_in*)&ifr.ifr_addr;    

    sin->sin_family = AF_INET;  

  

    //ipaddr

    if(inet_aton(Ipaddr,&(sin->sin_addr)) < 0)  

    {    

        perror("inet_aton   error");    

        return -2;    

    }   

   

    if(ioctl(fd,SIOCSIFADDR,&ifr) < 0)  

    {    

        perror("ioctl   SIOCSIFADDR   error");    

        return -3;    

    }

    //netmask

    if(inet_aton(mask,&(sin->sin_addr)) < 0)  

    {    

        perror("inet_pton   error");    

        return -4;    

    }   

    if(ioctl(fd, SIOCSIFNETMASK, &ifr) < 0)

    {

        perror("ioctl");

        return -5;

    }

    //gateway

    memset(&rt, 0, sizeof(struct rtentry));

    memset(sin, 0, sizeof(struct sockaddr_in));

    sin->sin_family = AF_INET;

    sin->sin_port = 0;

    if(inet_aton(gateway, &sin->sin_addr)<0)

    {

       printf ( "inet_aton error\n" );

    }

    memcpy ( &rt.rt_gateway, sin, sizeof(struct sockaddr_in));

    ((struct sockaddr_in *)&rt.rt_dst)->sin_family=AF_INET;

    ((struct sockaddr_in *)&rt.rt_genmask)->sin_family=AF_INET;

    rt.rt_flags = RTF_GATEWAY;

    if (ioctl(fd, SIOCADDRT, &rt)<0)

    {

        zError( "ioctl(SIOCADDRT) error in set_default_route\n");

        close(fd);

        return -1;

    }

    close(fd);

    return rc;

}