我正在尝试通过
现在来看这段代码中的
SIOCADDRT
和ioctl()
来设置我的机器默认网关。我在网上找到了下面的代码片段,可以正常工作:int fd = socket( PF_INET, SOCK_DGRAM, IPPROTO_IP );
struct rtentry route;
memset( &route, 0, sizeof( route ) );
struct sockaddr_in *addr = (struct sockaddr_in *)&route.rt_gateway;
addr->sin_family = AF_INET;
addr->sin_addr.s_addr = inet_addr( "10.0.2.2" );
addr = (struct sockaddr_in*) &route.rt_dst;
addr->sin_family = AF_INET;
addr->sin_addr.s_addr = INADDR_ANY;
addr = (struct sockaddr_in*) &route.rt_genmask;
addr->sin_family = AF_INET;
addr->sin_addr.s_addr = INADDR_ANY;
// TODO Add the interface name to the request
route.rt_flags = RTF_UP | RTF_GATEWAY;
route.rt_metric = 0;
int rc = ioctl( fd, SIOCADDRT, &route );
// [...]
现在来看这段代码中的
TODO
...如何指定要使用哪个接口?当我执行这段代码时,它似乎默认使用我的机器上的eth0
(这是我的唯一接口)。在route.h
头文件中,rt_entry
结构体的定义如下(也可在此处找到): /* This structure gets passed by the SIOCADDRT and SIOCDELRT calls. */
struct rtentry {
unsigned long rt_pad1;
struct sockaddr rt_dst; /* target address */
struct sockaddr rt_gateway; /* gateway addr (RTF_GATEWAY) */
struct sockaddr rt_genmask; /* target network mask (IP) */
unsigned short rt_flags;
short rt_pad2;
unsigned long rt_pad3;
void *rt_pad4;
short rt_metric; /* +1 for binary compatibility! */
char *rt_dev; /* forcing the device at add */
unsigned long rt_mtu; /* per route MTU/Window */
#define rt_mss rt_mtu /* Compatibility :-( */
unsigned long rt_window; /* Window clamping */
unsigned short rt_irtt; /* Initial RTT */
};
thx for any help.
rt_dev
,但不确定如何设置,可能是一个接口索引,你可以试试吗? - iabdalkaderchar*
,所以我认为这就是接口名称。 - iabdalkader