ioctl设置路由

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


int addRoute(char *ipAddr, char *mask,char *gateWay,char* devName)
{
  int fd;
  int rc = 0;
  struct sockaddr_in _sin;
  struct sockaddr_in *sin = &_sin;
  struct rtentry  rt;

  do
  {
    fd = socket(AF_INET, SOCK_DGRAM, 0);
    if(fd < 0)
    {
      printf("addRoute: socket   error\n");
      rc = -1;
      break;
    }
    //网关  
    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( "addRoute:  gateWay inet_aton error\n" );
      rc = -2;
      break;
    }
    memcpy ( &rt.rt_gateway, sin, sizeof(struct sockaddr_in));
    ((struct sockaddr_in *)&rt.rt_dst)->sin_family=AF_INET;
    if(inet_aton(ipAddr, &((struct sockaddr_in *)&rt.rt_dst)->sin_addr)<0)
    {
      printf( "addRoute:  dst inet_aton error\n" );
      rc = -3;
      break;
    }
    ((struct sockaddr_in *)&rt.rt_genmask)->sin_family=AF_INET;
    if(inet_aton(mask, &((struct sockaddr_in *)&rt.rt_genmask)->sin_addr)<0)
    {
      printf( "addRoute:  mask inet_aton error\n" );
      rc = -4;
      break;
    }

    if(devName)
      rt.rt_dev = devName;
    rt.rt_flags = RTF_GATEWAY;
    if (ioctl(fd, SIOCADDRT, &rt)<0)
    {
      printf( "ioctl(SIOCADDRT) error in set_route\n");
      rc = -5;
    }
  }while(0);

  close(fd);
  return rc;
}
void main()
{
   addRoute("192.168.222.0", "255.255.255.0", "192.168.111.1", "ens6");
}